*** empty log message ***

[l2tpns.git] / l2tpns.c

diff --git a/l2tpns.c b/l2tpns.c
index 8c23a9a..e616b0d 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -1,10 +1,10 @@
 // L2TP Network Server
 // Adrian Kennard 2002
 // L2TP Network Server
 // Adrian Kennard 2002

-// Copyright (c) 2003, 2004 Optus Internet Engineering
+// Copyright (c) 2003, 2004, 2005 Optus Internet Engineering

 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 

-char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.52 2004/11/17 15:08:19 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.134 2005/09/16 05:30:30 bodea Exp $";

 
 #include <arpa/inet.h>
 #include <assert.h>
 
 #include <arpa/inet.h>
 #include <assert.h>


@@ -19,6 +19,7 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.52 2004/11/17 15:08:19 bodea Exp
 #include <sys/mman.h>
 #include <netdb.h>
 #include <netinet/in.h>
 #include <sys/mman.h>
 #include <netdb.h>
 #include <netinet/in.h>

+#include <netinet/ip6.h>

 #include <stdarg.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <stdio.h>


@@ -51,76 +52,99 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.52 2004/11/17 15:08:19 bodea Exp
 
 #ifdef BGP
 #include "bgp.h"
 
 #ifdef BGP
 #include "bgp.h"

-#endif /* BGP */
+#endif

 
 // Globals
 
 // Globals

-struct configt *config = NULL; // all configuration
+configt *config = NULL;                // all configuration

 int tunfd = -1;                        // tun interface file handle. (network device)
 int udpfd = -1;                        // UDP file handle
 int controlfd = -1;            // Control signal handle
 int clifd = -1;                        // Socket listening for CLI connections.
 int tunfd = -1;                        // tun interface file handle. (network device)
 int udpfd = -1;                        // UDP file handle
 int controlfd = -1;            // Control signal handle
 int clifd = -1;                        // Socket listening for CLI connections.

+int daefd = -1;                        // Socket listening for DAE connections.

 int snoopfd = -1;              // UDP file handle for sending out intercept data
 int *radfds = NULL;            // RADIUS requests file handles
 int ifrfd = -1;                        // File descriptor for routing, etc
 int snoopfd = -1;              // UDP file handle for sending out intercept data
 int *radfds = NULL;            // RADIUS requests file handles
 int ifrfd = -1;                        // File descriptor for routing, etc

+int ifr6fd = -1;               // File descriptor for IPv6 routing, etc
+int rand_fd = -1;              // Random data source
+int cluster_sockfd = -1;       // Intra-cluster communications socket.
+int epollfd = -1;              // event polling

 time_t basetime = 0;           // base clock
 char hostname[1000] = "";      // us.
 time_t basetime = 0;           // base clock
 char hostname[1000] = "";      // us.

-static u32 sessionid = 0;      // session id for radius accounting
+static int tunidx;             // ifr_ifindex of tun device

 static int syslog_log = 0;     // are we logging to syslog
 static int syslog_log = 0;     // are we logging to syslog

-static FILE *log_stream = NULL;        // file handle for direct logging (i.e. direct into file, not via syslog).
-extern int cluster_sockfd;     // Intra-cluster communications socket.
-u32 last_id = 0;               // Last used PPP SID. Can I kill this?? -- mo
+static FILE *log_stream = 0;   // file handle for direct logging (i.e. direct into file, not via syslog).
+uint32_t last_id = 0;          // Unique ID for radius accounting
+
+// calculated from config->l2tp_mtu
+uint16_t MRU = 0;              // PPP MRU
+uint16_t MSS = 0;              // TCP MSS

 
 struct cli_session_actions *cli_session_actions = NULL;        // Pending session changes requested by CLI
 struct cli_tunnel_actions *cli_tunnel_actions = NULL;  // Pending tunnel changes required by CLI
 
 static void *ip_hash[256];     // Mapping from IP address to session structures.
 
 struct cli_session_actions *cli_session_actions = NULL;        // Pending session changes requested by CLI
 struct cli_tunnel_actions *cli_tunnel_actions = NULL;  // Pending tunnel changes required by CLI
 
 static void *ip_hash[256];     // Mapping from IP address to session structures.

+struct ipv6radix {
+       int sess;
+       struct ipv6radix *branch;
+} ipv6_hash[256];              // Mapping from IPv6 address to session structures.

 
 // Traffic counters.
 
 // Traffic counters.

-static u32 udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
-static u32 eth_rx = 0, eth_rx_pkt = 0;
-u32 eth_tx = 0;
+static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
+static uint32_t eth_rx = 0, eth_rx_pkt = 0;
+uint32_t eth_tx = 0;

 
 

-static u32 ip_pool_size = 1;           // Size of the pool of addresses used for dynamic address allocation.
+static uint32_t ip_pool_size = 1;      // Size of the pool of addresses used for dynamic address allocation.

 time_t time_now = 0;                   // Current time in seconds since epoch.
 static char time_now_string[64] = {0}; // Current time as a string.
 time_t time_now = 0;                   // Current time in seconds since epoch.
 static char time_now_string[64] = {0}; // Current time as a string.

-static char main_quit = 0;             // True if we're in the process of exiting.
+char main_quit = 0;                    // True if we're in the process of exiting.

 linked_list *loaded_plugins;
 linked_list *plugins[MAX_PLUGIN_TYPES];
 
 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
 linked_list *loaded_plugins;
 linked_list *plugins[MAX_PLUGIN_TYPES];
 
 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)

-#define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(struct configt, MEMBER), membersize(struct configt, MEMBER), TYPE }
+#define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }

 
 

-struct config_descriptt config_values[] = {
+config_descriptt config_values[] = {

        CONFIG("debug", debug, INT),
        CONFIG("log_file", log_filename, STRING),
        CONFIG("pid_file", pid_file, STRING),
        CONFIG("debug", debug, INT),
        CONFIG("log_file", log_filename, STRING),
        CONFIG("pid_file", pid_file, STRING),

-       CONFIG("l2tp_secret", l2tpsecret, STRING),
-       CONFIG("primary_dns", default_dns1, IP),
-       CONFIG("secondary_dns", default_dns2, IP),
-       CONFIG("save_state", save_state, BOOL),
-       CONFIG("primary_radius", radiusserver[0], IP),
-       CONFIG("secondary_radius", radiusserver[1], IP),
+       CONFIG("random_device", random_device, STRING),
+       CONFIG("l2tp_secret", l2tp_secret, STRING),
+       CONFIG("l2tp_mtu", l2tp_mtu, INT),
+       CONFIG("ppp_restart_time", ppp_restart_time, INT),
+       CONFIG("ppp_max_configure", ppp_max_configure, INT),
+       CONFIG("ppp_max_failure", ppp_max_failure, INT),
+       CONFIG("primary_dns", default_dns1, IPv4),
+       CONFIG("secondary_dns", default_dns2, IPv4),
+       CONFIG("primary_radius", radiusserver[0], IPv4),
+       CONFIG("secondary_radius", radiusserver[1], IPv4),

        CONFIG("primary_radius_port", radiusport[0], SHORT),
        CONFIG("secondary_radius_port", radiusport[1], SHORT),
        CONFIG("radius_accounting", radius_accounting, BOOL),
        CONFIG("primary_radius_port", radiusport[0], SHORT),
        CONFIG("secondary_radius_port", radiusport[1], SHORT),
        CONFIG("radius_accounting", radius_accounting, BOOL),

+       CONFIG("radius_interim", radius_interim, INT),

        CONFIG("radius_secret", radiussecret, STRING),
        CONFIG("radius_secret", radiussecret, STRING),

-       CONFIG("bind_address", bind_address, IP),
-       CONFIG("peer_address", peer_address, IP),
+       CONFIG("radius_authtypes", radius_authtypes_s, STRING),
+       CONFIG("radius_dae_port", radius_dae_port, SHORT),
+       CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
+       CONFIG("bind_address", bind_address, IPv4),
+       CONFIG("peer_address", peer_address, IPv4),

        CONFIG("send_garp", send_garp, BOOL),
        CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
        CONFIG("throttle_buckets", num_tbfs, INT),
        CONFIG("accounting_dir", accounting_dir, STRING),
        CONFIG("setuid", target_uid, INT),
        CONFIG("dump_speed", dump_speed, BOOL),
        CONFIG("send_garp", send_garp, BOOL),
        CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
        CONFIG("throttle_buckets", num_tbfs, INT),
        CONFIG("accounting_dir", accounting_dir, STRING),
        CONFIG("setuid", target_uid, INT),
        CONFIG("dump_speed", dump_speed, BOOL),

-       CONFIG("cleanup_interval", cleanup_interval, INT),

        CONFIG("multi_read_count", multi_read_count, INT),
        CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
        CONFIG("lock_pages", lock_pages, BOOL),
        CONFIG("icmp_rate", icmp_rate, INT),
        CONFIG("multi_read_count", multi_read_count, INT),
        CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
        CONFIG("lock_pages", lock_pages, BOOL),
        CONFIG("icmp_rate", icmp_rate, INT),

-       CONFIG("cluster_address", cluster_address, IP),
+       CONFIG("packet_limit", max_packets, INT),
+       CONFIG("cluster_address", cluster_address, IPv4),

        CONFIG("cluster_interface", cluster_interface, STRING),
        CONFIG("cluster_interface", cluster_interface, STRING),

+       CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),

        CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
        CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
        CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
        CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),

+       CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
+       CONFIG("ipv6_prefix", ipv6_prefix, IPv6),

        { NULL, 0, 0, 0 },
 };
 
        { NULL, 0, 0, 0 },
 };
 


@@ -135,70 +159,81 @@ static char *plugin_functions[] = {
        "plugin_kill_session",
        "plugin_control",
        "plugin_radius_response",
        "plugin_kill_session",
        "plugin_control",
        "plugin_radius_response",

+       "plugin_radius_reset",

        "plugin_become_master",
        "plugin_new_session_master",
 };
 
 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
 
        "plugin_become_master",
        "plugin_new_session_master",
 };
 
 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
 

+// Counters for shutdown sessions
+static sessiont shut_acct[8192];
+static sessionidt shut_acct_n = 0;
+

 tunnelt *tunnel = NULL;                        // Array of tunnel structures.
 sessiont *session = NULL;              // Array of session structures.
 tunnelt *tunnel = NULL;                        // Array of tunnel structures.
 sessiont *session = NULL;              // Array of session structures.

-sessioncountt *sess_count = NULL;      // Array of partial per-session traffic counters.
+sessionlocalt *sess_local = NULL;      // Array of local per-session counters.

 radiust *radius = NULL;                        // Array of radius structures.
 ippoolt *ip_address_pool = NULL;       // Array of dynamic IP addresses.
 radiust *radius = NULL;                        // Array of radius structures.
 ippoolt *ip_address_pool = NULL;       // Array of dynamic IP addresses.

+ip_filtert *ip_filters = NULL;         // Array of named filters.

 static controlt *controlfree = 0;
 struct Tstats *_statistics = NULL;
 #ifdef RINGBUFFER
 struct Tringbuffer *ringbuffer = NULL;
 #endif
 
 static controlt *controlfree = 0;
 struct Tstats *_statistics = NULL;
 #ifdef RINGBUFFER
 struct Tringbuffer *ringbuffer = NULL;
 #endif
 

-static void cache_ipmap(ipt ip, int s);
-static void uncache_ipmap(ipt ip);
+static void cache_ipmap(in_addr_t ip, int s);
+static void uncache_ipmap(in_addr_t ip);
+static void cache_ipv6map(struct in6_addr ip, int prefixlen, int s);

 static void free_ip_address(sessionidt s);
 static void free_ip_address(sessionidt s);

-static void dump_acct_info(void);
+static void dump_acct_info(int all);

 static void sighup_handler(int sig);
 static void sigalrm_handler(int sig);
 static void sighup_handler(int sig);
 static void sigalrm_handler(int sig);

-static void sigterm_handler(int sig);
-static void sigquit_handler(int sig);
+static void shutdown_handler(int sig);

 static void sigchild_handler(int sig);
 static void sigchild_handler(int sig);

-static void read_state(void);
-static void dump_state(void);
-static void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response);
+static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);

 static void update_config(void);
 static void read_config_file(void);
 static void initplugins(void);
 static int add_plugin(char *plugin_name);
 static int remove_plugin(char *plugin_name);
 static void plugins_done(void);
 static void update_config(void);
 static void read_config_file(void);
 static void initplugins(void);
 static int add_plugin(char *plugin_name);
 static int remove_plugin(char *plugin_name);
 static void plugins_done(void);

-static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen);
+static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen);

 static tunnelidt new_tunnel(void);
 static tunnelidt new_tunnel(void);

-static int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length);
+static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);

 
 

-// return internal time (10ths since process startup)
-static clockt now(void)
+// on slaves, alow BGP to withdraw cleanly before exiting
+#define QUIT_DELAY     5
+
+// quit actions (master)
+#define QUIT_FAILOVER  1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
+#define QUIT_SHUTDOWN  2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
+
+// return internal time (10ths since process startup), set f if given
+static clockt now(double *f)

 {
        struct timeval t;
        gettimeofday(&t, 0);
 {
        struct timeval t;
        gettimeofday(&t, 0);

+       if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;

        return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
 }
 
 // work out a retry time based on try number
 // This is a straight bounded exponential backoff.
 // Maximum re-try time is 32 seconds. (2^5).
        return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
 }
 
 // work out a retry time based on try number
 // This is a straight bounded exponential backoff.
 // Maximum re-try time is 32 seconds. (2^5).

-clockt backoff(u8 try)
+clockt backoff(uint8_t try)

 {
        if (try > 5) try = 5;                  // max backoff
 {
        if (try > 5) try = 5;                  // max backoff

-       return now() + 10 * (1 << try);
+       return now(NULL) + 10 * (1 << try);

 }
 
 
 //
 }
 
 
 //

-// Log a debug message.  Typically called vias LOG macro
+// Log a debug message.  Typically called via the LOG macro

 //
 //

-void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...)
+void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)

 {
        static char message[65536] = {0};
 {
        static char message[65536] = {0};

-       static char message2[65536] = {0};

        va_list ap;
 
 #ifdef RINGBUFFER
        va_list ap;
 
 #ifdef RINGBUFFER


@@ -211,7 +246,6 @@ void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format,
                                ringbuffer->head = 0;
 
                ringbuffer->buffer[ringbuffer->tail].level = level;
                                ringbuffer->head = 0;
 
                ringbuffer->buffer[ringbuffer->tail].level = level;

-               ringbuffer->buffer[ringbuffer->tail].address = address;

                ringbuffer->buffer[ringbuffer->tail].session = s;
                ringbuffer->buffer[ringbuffer->tail].tunnel = t;
                va_start(ap, format);
                ringbuffer->buffer[ringbuffer->tail].session = s;
                ringbuffer->buffer[ringbuffer->tail].tunnel = t;
                va_start(ap, format);


@@ -223,32 +257,27 @@ void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format,
        if (config->debug < level) return;
 
        va_start(ap, format);
        if (config->debug < level) return;
 
        va_start(ap, format);

+       vsnprintf(message, sizeof(message), format, ap);
+

        if (log_stream)
        if (log_stream)

-       {
-               vsnprintf(message2, 65535, format, ap);
-               snprintf(message, 65535, "%s %02d/%02d %s", time_now_string, t, s, message2);
-               fprintf(log_stream, "%s", message);
-       }
+               fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);

        else if (syslog_log)
        else if (syslog_log)

-       {
-               vsnprintf(message2, 65535, format, ap);
-               snprintf(message, 65535, "%02d/%02d %s", t, s, message2);
-               syslog(level + 2, message); // We don't need LOG_EMERG or LOG_ALERT
-       }
+               syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
+

        va_end(ap);
 }
 
        va_end(ap);
 }
 

-void _log_hex(int level, const char *title, const char *data, int maxsize)
+void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)

 {
        int i, j;
 {
        int i, j;

-       const u8 *d = (const u8 *)data;
+       const uint8_t *d = data;

 
        if (config->debug < level) return;
 
        // No support for _log_hex to syslog
        if (log_stream)
        {
 
        if (config->debug < level) return;
 
        // No support for _log_hex to syslog
        if (log_stream)
        {

-               _log(level, 0, 0, 0, "%s (%d bytes):\n", title, maxsize);
+               _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);

                setvbuf(log_stream, NULL, _IOFBF, 16384);
 
                for (i = 0; i < maxsize; )
                setvbuf(log_stream, NULL, _IOFBF, 16384);
 
                for (i = 0; i < maxsize; )


@@ -289,6 +318,76 @@ void _log_hex(int level, const char *title, const char *data, int maxsize)
        }
 }
 
        }
 }
 

+// update a counter, accumulating 2^32 wraps
+void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
+{
+       uint32_t new = *counter + delta;
+       if (new < *counter)
+               (*wrap)++;
+
+       *counter = new;
+}
+
+// initialise the random generator
+static void initrandom(char *source)
+{
+       static char path[sizeof(config->random_device)] = "*undefined*";
+
+       // reinitialise only if we are forced to do so or if the config has changed
+       if (source && !strncmp(path, source, sizeof(path)))
+               return;
+
+       // close previous source, if any
+       if (rand_fd >= 0)
+               close(rand_fd);
+
+       rand_fd = -1;
+
+       if (source)
+       {
+               // register changes
+               snprintf(path, sizeof(path), "%s", source);
+
+               if (*path == '/')
+               {
+                       rand_fd = open(path, O_RDONLY|O_NONBLOCK);
+                       if (rand_fd < 0)
+                               LOG(0, 0, 0, "Error opening the random device %s: %s\n",
+                                       path, strerror(errno));
+               }
+       }
+}
+
+// fill buffer with random data
+void random_data(uint8_t *buf, int len)
+{
+       int n = 0;
+
+       CSTAT(random_data);
+       if (rand_fd >= 0)
+       {
+               n = read(rand_fd, buf, len);
+               if (n >= len) return;
+               if (n < 0)
+               {
+                       if (errno != EAGAIN)
+                       {
+                               LOG(0, 0, 0, "Error reading from random source: %s\n",
+                                       strerror(errno));
+
+                               // fall back to rand()
+                               initrandom(NULL);
+                       }
+
+                       n = 0;
+               }
+       }
+
+       // append missing data
+       while (n < len)
+               // not using the low order bits from the prng stream
+               buf[n++] = (rand() >> 4) & 0xff;
+}

 
 // Add a route
 //
 
 // Add a route
 //


@@ -298,7 +397,7 @@ void _log_hex(int level, const char *title, const char *data, int maxsize)
 //
 // 'ip' and 'mask' must be in _host_ order.
 //
 //
 // 'ip' and 'mask' must be in _host_ order.
 //

-static void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add)
+static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, int add)

 {
        struct rtentry r;
        int i;
 {
        struct rtentry r;
        int i;


@@ -310,25 +409,23 @@ static void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add)
        memset(&r, 0, sizeof(r));
        r.rt_dev = config->tundevice;
        r.rt_dst.sa_family = AF_INET;
        memset(&r, 0, sizeof(r));
        r.rt_dev = config->tundevice;
        r.rt_dst.sa_family = AF_INET;

-       *(u32 *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
+       *(uint32_t *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);

        r.rt_gateway.sa_family = AF_INET;
        r.rt_gateway.sa_family = AF_INET;

-       *(u32 *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);
+       *(uint32_t *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);

        r.rt_genmask.sa_family = AF_INET;
        r.rt_genmask.sa_family = AF_INET;

-       *(u32 *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);
+       *(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);

        r.rt_flags = (RTF_UP | RTF_STATIC);
        if (gw)
                r.rt_flags |= RTF_GATEWAY;
        else if (mask == 0xffffffff)
                r.rt_flags |= RTF_HOST;
 
        r.rt_flags = (RTF_UP | RTF_STATIC);
        if (gw)
                r.rt_flags |= RTF_GATEWAY;
        else if (mask == 0xffffffff)
                r.rt_flags |= RTF_HOST;
 

-       LOG(1, ip, 0, 0, "Route %s %u.%u.%u.%u/%u.%u.%u.%u %u.%u.%u.%u\n",
-           add ? "add" : "del",
-           ip   >> 24, ip   >> 16 & 0xff, ip   >> 8 & 0xff, ip   & 0xff,
-           mask >> 24, mask >> 16 & 0xff, mask >> 8 & 0xff, mask & 0xff,
-           gw   >> 24, gw   >> 16 & 0xff, gw   >> 8 & 0xff, gw   & 0xff);
+       LOG(1, s, 0, "Route %s %s/%s%s%s\n", add ? "add" : "del",
+           fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1),
+           gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");

 
        if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
 
        if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)

-               LOG(0, 0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));
+               LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));

 
 #ifdef BGP
        if (add)
 
 #ifdef BGP
        if (add)


@@ -355,11 +452,61 @@ static void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add)
        }
 }
 
        }
 }
 

+void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
+{
+       struct in6_rtmsg rt;
+       char ipv6addr[INET6_ADDRSTRLEN];
+
+       if (ifr6fd < 0)
+       {
+               LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
+               return;
+       }
+
+       memset(&rt, 0, sizeof(rt));
+
+       memcpy(&rt.rtmsg_dst, &ip, sizeof(struct in6_addr));
+       rt.rtmsg_dst_len = prefixlen;
+       rt.rtmsg_metric = 1;
+       rt.rtmsg_flags = RTF_UP;
+       rt.rtmsg_ifindex = tunidx;
+
+       LOG(1, 0, 0, "Route %s %s/%d\n",
+           add ? "add" : "del",
+           inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
+           prefixlen);
+
+       if (ioctl(ifr6fd, add ? SIOCADDRT : SIOCDELRT, (void *) &rt) < 0)
+               LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
+                               strerror(errno));
+
+       // FIXME: need to add BGP routing (RFC2858)
+
+       if (s)
+       {
+               if (!add)       // Are we deleting a route?
+                       s = 0;  // Caching the session as '0' is the same as uncaching.
+
+               cache_ipv6map(ip, prefixlen, s);
+       }
+       
+       return;
+}
+
+// defined in linux/ipv6.h, but tricky to include from user-space
+// TODO: move routing to use netlink rather than ioctl
+struct in6_ifreq {
+       struct in6_addr ifr6_addr;
+       __u32 ifr6_prefixlen;
+       unsigned int ifr6_ifindex;
+};
+

 //
 // Set up TUN interface
 static void inittun(void)
 {
        struct ifreq ifr;
 //
 // Set up TUN interface
 static void inittun(void)
 {
        struct ifreq ifr;

+       struct in6_ifreq ifr6;

        struct sockaddr_in sin = {0};
        memset(&ifr, 0, sizeof(ifr));
        ifr.ifr_flags = IFF_TUN;
        struct sockaddr_in sin = {0};
        memset(&ifr, 0, sizeof(ifr));
        ifr.ifr_flags = IFF_TUN;


@@ -367,7 +514,7 @@ static void inittun(void)
        tunfd = open(TUNDEVICE, O_RDWR);
        if (tunfd < 0)
        {                          // fatal
        tunfd = open(TUNDEVICE, O_RDWR);
        if (tunfd < 0)
        {                          // fatal

-               LOG(0, 0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
+               LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));

                exit(1);
        }
        {
                exit(1);
        }
        {


@@ -376,7 +523,7 @@ static void inittun(void)
        }
        if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
        {
        }
        if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
        {

-               LOG(0, 0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));

                exit(1);
        }
        assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
                exit(1);
        }
        assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));


@@ -389,25 +536,61 @@ static void inittun(void)
 
        if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0)
        {
 
        if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0)
        {

-               LOG(0, 0, 0, 0, "Error setting tun address: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno));

                exit(1);
        }
        /* Bump up the qlen to deal with bursts from the network */
        ifr.ifr_qlen = 1000;
        if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0)
        {
                exit(1);
        }
        /* Bump up the qlen to deal with bursts from the network */
        ifr.ifr_qlen = 1000;
        if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0)
        {

-               LOG(0, 0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno));

                exit(1);
        }
        ifr.ifr_flags = IFF_UP;
        if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0)
        {
                exit(1);
        }
        ifr.ifr_flags = IFF_UP;
        if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0)
        {

-               LOG(0, 0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
+               exit(1);
+       }
+       if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0)
+       {
+               LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));

                exit(1);
        }
                exit(1);
        }

+       tunidx = ifr.ifr_ifindex;
+
+       // Only setup IPv6 on the tun device if we have a configured prefix
+       if (config->ipv6_prefix.s6_addr[0]) {
+               ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0);
+
+               // Link local address is FE80::1
+               memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
+               ifr6.ifr6_addr.s6_addr[0] = 0xFE;
+               ifr6.ifr6_addr.s6_addr[1] = 0x80;
+               ifr6.ifr6_addr.s6_addr[15] = 1;
+               ifr6.ifr6_prefixlen = 64;
+               ifr6.ifr6_ifindex = ifr.ifr_ifindex;
+               if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
+               {
+                       LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
+                               " %s\n", strerror(errno));
+               }
+
+               // Global address is prefix::1
+               memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
+               ifr6.ifr6_addr = config->ipv6_prefix;
+               ifr6.ifr6_addr.s6_addr[15] = 1;
+               ifr6.ifr6_prefixlen = 64;
+               ifr6.ifr6_ifindex = ifr.ifr_ifindex;
+               if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
+               {
+                       LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
+                               strerror(errno));
+               }
+       }

 }
 
 }
 

-// set up UDP port
+// set up UDP ports

 static void initudp(void)
 {
        int on = 1;
 static void initudp(void)
 {
        int on = 1;


@@ -426,10 +609,9 @@ static void initudp(void)
        }
        if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0)
        {
        }
        if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0)
        {

-               LOG(0, 0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));

                exit(1);
        }
                exit(1);
        }

-       snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

 
        // Control
        memset(&addr, 0, sizeof(addr));
 
        // Control
        memset(&addr, 0, sizeof(addr));


@@ -439,9 +621,24 @@ static void initudp(void)
        setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
        if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0)
        {
        setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
        if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0)
        {

-               LOG(0, 0, 0, 0, "Error in control bind: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
+               exit(1);
+       }
+
+       // Dynamic Authorization Extensions to RADIUS
+       memset(&addr, 0, sizeof(addr));
+       addr.sin_family = AF_INET;
+       addr.sin_port = htons(config->radius_dae_port);
+       daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+       setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+       if (bind(daefd, (void *) &addr, sizeof(addr)) < 0)
+       {
+               LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));

                exit(1);
        }
                exit(1);
        }

+
+       // Intercept
+       snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

 }
 
 //
 }
 
 //


@@ -459,27 +656,74 @@ static void initudp(void)
 // IP address.
 //
 
 // IP address.
 //
 

-static int lookup_ipmap(ipt ip)
+static int lookup_ipmap(in_addr_t ip)
+{
+       uint8_t *a = (uint8_t *) &ip;
+       uint8_t **d = (uint8_t **) ip_hash;
+
+       if (!(d = (uint8_t **) d[(size_t) *a++])) return 0;
+       if (!(d = (uint8_t **) d[(size_t) *a++])) return 0;
+       if (!(d = (uint8_t **) d[(size_t) *a++])) return 0;
+
+       return (int) (intptr_t) d[(size_t) *a];
+}
+
+static int lookup_ipv6map(struct in6_addr ip)

 {
 {

-       u8 *a = (u8 *)&ip;
-       char **d = (char **) ip_hash;
+       struct ipv6radix *curnode;
+       int i;

        int s;
        int s;

+       char ipv6addr[INET6_ADDRSTRLEN];
+
+       curnode = &ipv6_hash[ip.s6_addr[0]];
+       i = 1;
+       s = curnode->sess;
+
+       while (s == 0 && i < 15 && curnode->branch != NULL)
+       {
+               curnode = &curnode->branch[ip.s6_addr[i]];
+               s = curnode->sess;
+               i++;
+       }

 
 

-       if (!(d = (char **) d[(size_t) *a++])) return 0;
-       if (!(d = (char **) d[(size_t) *a++])) return 0;
-       if (!(d = (char **) d[(size_t) *a++])) return 0;
+       LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
+                       inet_ntop(AF_INET6, &ip, ipv6addr,
+                               INET6_ADDRSTRLEN),
+                       s);

 
 

-       s = (ipt) d[(size_t) *a];

        return s;
 }
 
        return s;
 }
 

-sessionidt sessionbyip(ipt ip)
+sessionidt sessionbyip(in_addr_t ip)

 {
        int s = lookup_ipmap(ip);
 {
        int s = lookup_ipmap(ip);

-       CSTAT(call_sessionbyip);
+       CSTAT(sessionbyip);

 
 

-       if (s > 0 && s < MAXSESSION && session[s].tunnel)
+       if (s > 0 && s < MAXSESSION && session[s].opened)
+               return (sessionidt) s;
+
+       return 0;
+}
+
+sessionidt sessionbyipv6(struct in6_addr ip)
+{
+       int s;
+       CSTAT(sessionbyipv6);
+
+       if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
+               (ip.s6_addr[0] == 0xFE &&
+                ip.s6_addr[1] == 0x80 &&
+                ip.s6_addr16[1] == 0 &&
+                ip.s6_addr16[2] == 0 &&
+                ip.s6_addr16[3] == 0)) {
+               s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
+       } else {
+               s = lookup_ipv6map(ip);
+       }
+
+       if (s > 0 && s < MAXSESSION && session[s].opened)

                return s;
                return s;

+

        return 0;
 }
 
        return 0;
 }
 


@@ -489,38 +733,75 @@ sessionidt sessionbyip(ipt ip)
 //
 // (It's actually cached in network order)
 //
 //
 // (It's actually cached in network order)
 //

-static void cache_ipmap(ipt ip, int s)
+static void cache_ipmap(in_addr_t ip, int s)

 {
 {

-       ipt nip = htonl(ip);            // MUST be in network order. I.e. MSB must in be ((char*)(&ip))[0]
-       u8 *a = (u8 *) &nip;
-       char **d = (char **) ip_hash;
+       in_addr_t nip = htonl(ip);      // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
+       uint8_t *a = (uint8_t *) &nip;
+       uint8_t **d = (uint8_t **) ip_hash;

        int i;
 
        for (i = 0; i < 3; i++)
        {
                if (!d[(size_t) a[i]])
                {
        int i;
 
        for (i = 0; i < 3; i++)
        {
                if (!d[(size_t) a[i]])
                {

-                       if (!(d[(size_t) a[i]] = calloc(256, sizeof (void *))))
+                       if (!(d[(size_t) a[i]] = calloc(256, sizeof(void *))))

                                return;
                }
 
                                return;
                }
 

-               d = (char **) d[(size_t) a[i]];
+               d = (uint8_t **) d[(size_t) a[i]];

        }
 
        }
 

-       d[(size_t) a[3]] = (char *)((int)s);
+       d[(size_t) a[3]] = (uint8_t *) (intptr_t) s;

 
        if (s > 0)
 
        if (s > 0)

-               LOG(4, ip, s, session[s].tunnel, "Caching ip address %s\n", inet_toa(nip));
+               LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
+

        else if (s == 0)
        else if (s == 0)

-               LOG(4, ip, 0, 0, "Un-caching ip address %s\n", inet_toa(nip));
+               LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));

        // else a map to an ip pool index.
 }
 
        // else a map to an ip pool index.
 }
 

-static void uncache_ipmap(ipt ip)
+static void uncache_ipmap(in_addr_t ip)

 {
        cache_ipmap(ip, 0);     // Assign it to the NULL session.
 }
 
 {
        cache_ipmap(ip, 0);     // Assign it to the NULL session.
 }
 

+static void cache_ipv6map(struct in6_addr ip, int prefixlen, int s)
+{
+       int i;
+       int bytes;
+       struct ipv6radix *curnode;
+       char ipv6addr[INET6_ADDRSTRLEN];
+
+       curnode = &ipv6_hash[ip.s6_addr[0]];
+
+       bytes = prefixlen >> 3;
+       i = 1;
+       while (i < bytes) {
+               if (curnode->branch == NULL)
+               {
+                       if (!(curnode->branch = calloc(256,
+                                       sizeof (struct ipv6radix))))
+                               return;
+               }
+               curnode = &curnode->branch[ip.s6_addr[i]];
+               i++;
+       }
+
+       curnode->sess = s;
+
+       if (s > 0)
+               LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
+                               inet_ntop(AF_INET6, &ip, ipv6addr, 
+                                       INET6_ADDRSTRLEN),
+                               prefixlen);
+       else if (s == 0)
+               LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
+                               inet_ntop(AF_INET6, &ip, ipv6addr, 
+                                       INET6_ADDRSTRLEN),
+                               prefixlen);
+}
+

 //
 // CLI list to dump current ipcache.
 //
 //
 // CLI list to dump current ipcache.
 //


@@ -539,22 +820,22 @@ int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
        {
                if (!d[i])
                        continue;
        {
                if (!d[i])
                        continue;

-               e = (char**) d[i];
+               e = (char **) d[i];

                for (j = 0; j < 256; ++j)
                {
                        if (!e[j])
                                continue;
                for (j = 0; j < 256; ++j)
                {
                        if (!e[j])
                                continue;

-                       f = (char**) e[j];
+                       f = (char **) e[j];

                        for (k = 0; k < 256; ++k)
                        {
                                if (!f[k])
                                        continue;
                        for (k = 0; k < 256; ++k)
                        {
                                if (!f[k])
                                        continue;

-                               g = (char**)f[k];
+                               g = (char **)f[k];

                                for (l = 0; l < 256; ++l)
                                {
                                        if (!g[l])
                                                continue;
                                for (l = 0; l < 256; ++l)
                                {
                                        if (!g[l])
                                                continue;

-                                       cli_print(cli, "%7d %d.%d.%d.%d", (int) g[l], i, j, k, l);
+                                       cli_print(cli, "%7d %d.%d.%d.%d", (int) (intptr_t) g[l], i, j, k, l);

                                        ++count;
                                }
                        }
                                        ++count;
                                }
                        }


@@ -574,10 +855,13 @@ int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
 sessionidt sessionbyuser(char *username)
 {
        int s;
 sessionidt sessionbyuser(char *username)
 {
        int s;

-       CSTAT(call_sessionbyuser);
+       CSTAT(sessionbyuser);

 
 

-       for (s = 1; s < MAXSESSION ; ++s)
+       for (s = 1; s <= config->cluster_highest_sessionid ; ++s)

        {
        {

+               if (!session[s].opened)
+                       continue;
+

                if (session[s].walled_garden)
                        continue;               // Skip walled garden users.
 
                if (session[s].walled_garden)
                        continue;               // Skip walled garden users.
 


@@ -588,30 +872,30 @@ sessionidt sessionbyuser(char *username)
        return 0;       // Not found.
 }
 
        return 0;       // Not found.
 }
 

-void send_garp(ipt ip)
+void send_garp(in_addr_t ip)

 {
        int s;
        struct ifreq ifr;
 {
        int s;
        struct ifreq ifr;

-       u8 mac[6];
+       uint8_t mac[6];

 
        s = socket(PF_INET, SOCK_DGRAM, 0);
        if (s < 0)
        {
 
        s = socket(PF_INET, SOCK_DGRAM, 0);
        if (s < 0)
        {

-               LOG(0, 0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));

                return;
        }
        memset(&ifr, 0, sizeof(ifr));
        strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
        if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
        {
                return;
        }
        memset(&ifr, 0, sizeof(ifr));
        strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
        if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
        {

-               LOG(0, 0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));

                close(s);
                return;
        }
        memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
        if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
        {
                close(s);
                return;
        }
        memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
        if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
        {

-               LOG(0, 0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));

                close(s);
                return;
        }
                close(s);
                return;
        }


@@ -619,31 +903,30 @@ void send_garp(ipt ip)
        sendarp(ifr.ifr_ifindex, mac, ip);
 }
 
        sendarp(ifr.ifr_ifindex, mac, ip);
 }
 

-// Find session by username, 0 for not found

 static sessiont *sessiontbysessionidt(sessionidt s)
 {
 static sessiont *sessiontbysessionidt(sessionidt s)
 {

-       if (!s || s > MAXSESSION) return NULL;
+       if (!s || s >= MAXSESSION) return NULL;

        return &session[s];
 }
 
 static sessionidt sessionidtbysessiont(sessiont *s)
 {
        sessionidt val = s-session;
        return &session[s];
 }
 
 static sessionidt sessionidtbysessiont(sessiont *s)
 {
        sessionidt val = s-session;

-       if (s < session || val > MAXSESSION) return 0;
+       if (s < session || val >= MAXSESSION) return 0;

        return val;
 }
 
 // actually send a control message for a specific tunnel
        return val;
 }
 
 // actually send a control message for a specific tunnel

-void tunnelsend(u8 * buf, u16 l, tunnelidt t)
+void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)

 {
        struct sockaddr_in addr;
 
 {
        struct sockaddr_in addr;
 

-       CSTAT(call_tunnelsend);
+       CSTAT(tunnelsend);

 
        if (!t)
        {
                static int backtrace_count = 0;
 
        if (!t)
        {
                static int backtrace_count = 0;

-               LOG(0, 0, 0, t, "tunnelsend called with 0 as tunnel id\n");
+               LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");

                STAT(tunnel_tx_errors);
                log_backtrace(backtrace_count, 5)
                return;
                STAT(tunnel_tx_errors);
                log_backtrace(backtrace_count, 5)
                return;


@@ -652,18 +935,19 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t)
        if (!tunnel[t].ip)
        {
                static int backtrace_count = 0;
        if (!tunnel[t].ip)
        {
                static int backtrace_count = 0;

-               LOG(1, 0, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
+               LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");

                log_backtrace(backtrace_count, 5)
                STAT(tunnel_tx_errors);
                return;
        }
                log_backtrace(backtrace_count, 5)
                STAT(tunnel_tx_errors);
                return;
        }

+

        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;

-       *(u32 *) & addr.sin_addr = htonl(tunnel[t].ip);
+       *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);

        addr.sin_port = htons(tunnel[t].port);
 
        // sequence expected, if sequence in message
        addr.sin_port = htons(tunnel[t].port);
 
        // sequence expected, if sequence in message

-       if (*buf & 0x08) *(u16 *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
+       if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);

 
        // If this is a control message, deal with retries
        if (*buf & 0x80)
 
        // If this is a control message, deal with retries
        if (*buf & 0x80)


@@ -673,13 +957,13 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t)
                if (tunnel[t].try > 1)
                {
                        STAT(tunnel_retries);
                if (tunnel[t].try > 1)
                {
                        STAT(tunnel_retries);

-                       LOG(3, tunnel[t].ip, 0, t, "Control message resend try %d\n", tunnel[t].try);
+                       LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);

                }
        }
 
        if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
        {
                }
        }
 
        if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
        {

-               LOG(0, tunnel[t].ip, ntohs((*(u16 *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
+               LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",

                                strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
                STAT(tunnel_tx_errors);
                return;
                                strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
                STAT(tunnel_tx_errors);
                return;


@@ -694,37 +978,81 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t)
 // Tiny helper function to write data to
 // the 'tun' device.
 //
 // Tiny helper function to write data to
 // the 'tun' device.
 //

-int tun_write(u8 * data, int size)
+int tun_write(uint8_t * data, int size)

 {
        return write(tunfd, data, size);
 }
 
 {
        return write(tunfd, data, size);
 }
 

+// adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
+void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
+{
+       int d = (tcp[12] >> 4) * 4;
+       uint8_t *mss = 0;
+       uint8_t *data;
+
+       if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
+               return;
+
+       if (tcp + d > buf + len) // short?
+               return;
+
+       data = tcp + d;
+       tcp += 20;
+
+       while (tcp < data)
+       {
+               if (*tcp == 2 && tcp[1] == 4) // mss option (2), length 4
+               {
+                       mss = tcp + 2;
+                       if (mss + 2 > data) return; // short?
+                       break;
+               }
+
+               if (*tcp == 0) return; // end of options
+               if (*tcp == 1 || !tcp[1]) // no op (one byte), or no length (prevent loop)
+                       tcp++;
+               else
+                       tcp += tcp[1]; // skip over option
+       }
+
+       if (!mss) return; // not found
+       if (ntohs(*(uint16_t *) mss) <= MSS) return; // mss OK
+
+       LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s, adjusted mss from %u to %u\n",
+               fmtaddr(*(in_addr_t *)(buf + 12), 0), ntohs(*(uint16_t *)tcp),
+               fmtaddr(*(in_addr_t *)(buf + 16), 1), ntohs(*(uint16_t *)(tcp + 2)),
+               (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "",
+               ntohs(*(uint16_t *) mss), MSS);
+
+       // FIXME
+}
+

 // process outgoing (to tunnel) IP
 //
 // process outgoing (to tunnel) IP
 //

-static void processipout(u8 * buf, int len)
+static void processipout(uint8_t *buf, int len)

 {
        sessionidt s;
        sessiont *sp;
        tunnelidt t;
 {
        sessionidt s;
        sessiont *sp;
        tunnelidt t;

-       ipt ip;
+       in_addr_t ip;

 
 

-       char * data = buf;      // Keep a copy of the originals.
+       uint8_t *data = buf;    // Keep a copy of the originals.

        int size = len;
 
        int size = len;
 

-       u8 b[MAXETHER + 20];
+       uint8_t b[MAXETHER + 20];

 
 

-       CSTAT(call_processipout);
+       CSTAT(processipout);

 
        if (len < MIN_IP_SIZE)
        {
 
        if (len < MIN_IP_SIZE)
        {

-               LOG(1, 0, 0, 0, "Short IP, %d bytes\n", len);
-               STAT(tunnel_tx_errors);
+               LOG(1, 0, 0, "Short IP, %d bytes\n", len);
+               STAT(tun_rx_errors);

                return;
        }
        if (len >= MAXETHER)
        {
                return;
        }
        if (len >= MAXETHER)
        {

-               LOG(1, 0, 0, 0, "Oversize IP packet %d bytes\n", len);
-               STAT(tunnel_tx_errors);
+               LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
+               STAT(tun_rx_errors);

                return;
        }
 
                return;
        }
 


@@ -733,13 +1061,13 @@ static void processipout(u8 * buf, int len)
        len -= 4;
 
        // Got an IP header now
        len -= 4;
 
        // Got an IP header now

-       if (*(u8 *)(buf) >> 4 != 4)
+       if (*(uint8_t *)(buf) >> 4 != 4)

        {
        {

-               LOG(1, 0, 0, 0, "IP: Don't understand anything except IPv4\n");
+               LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");

                return;
        }
 
                return;
        }
 

-       ip = *(u32 *)(buf + 16);
+       ip = *(uint32_t *)(buf + 16);

        if (!(s = sessionbyip(ip)))
        {
                // Is this a packet for a session that doesn't exist?
        if (!(s = sessionbyip(ip)))
        {
                // Is this a packet for a session that doesn't exist?


@@ -754,14 +1082,66 @@ static void processipout(u8 * buf, int len)
 
                if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
                {
 
                if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
                {

-                       LOG(4, 0, 0, 0, "IP: Sending ICMP host unreachable to %s\n", inet_toa(*(u32 *)(buf + 12)));
-                       host_unreachable(*(u32 *)(buf + 12), *(u16 *)(buf + 4), ip, buf, (len < 64) ? 64 : len);
+                       LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
+                       host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
+                               config->bind_address ? config->bind_address : my_address, buf, len);

                }
                return;
        }
        t = session[s].tunnel;
        sp = &session[s];
 
                }
                return;
        }
        t = session[s].tunnel;
        sp = &session[s];
 

+       // DoS prevention: enforce a maximum number of packets per 0.1s for a session
+       if (config->max_packets > 0)
+       {
+               if (sess_local[s].last_packet_out == TIME)
+               {
+                       int max = config->max_packets;
+
+                       // All packets for throttled sessions are handled by the
+                       // master, so further limit by using the throttle rate.
+                       // A bit of a kludge, since throttle rate is in kbps,
+                       // but should still be generous given our average DSL
+                       // packet size is 200 bytes: a limit of 28kbps equates
+                       // to around 180 packets per second.
+                       if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
+                               max = sp->throttle_out;
+
+                       if (++sess_local[s].packets_out > max)
+                       {
+                               sess_local[s].packets_dropped++;
+                               return;
+                       }
+               }
+               else
+               {
+                       if (sess_local[s].packets_dropped)
+                       {
+                               INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
+                               LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
+                                       sess_local[s].packets_dropped, sess_local[s].packets_out,
+                                       fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
+                                       sp->user);
+                       }
+
+                       sess_local[s].last_packet_out = TIME;
+                       sess_local[s].packets_out = 1;
+                       sess_local[s].packets_dropped = 0;
+               }
+       }
+
+       // run access-list if any
+       if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
+               return;
+
+       // adjust MSS on SYN and SYN,ACK packets with options
+       if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
+       {
+               int ihl = (buf[0] & 0xf) * 4; // length of IP header
+               if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
+                       adjust_tcp_mss(s, t, buf, len, buf + ihl);
+       }
+

        if (sp->tbf_out)
        {
                // Are we throttling this session?
        if (sp->tbf_out)
        {
                // Are we throttling this session?


@@ -778,16 +1158,123 @@ static void processipout(u8 * buf, int len)
                return;
        }
 
                return;
        }
 

-       LOG(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
+       LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);

 
        // Add on L2TP header
        {
 
        // Add on L2TP header
        {

-               u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
-               if (!p)
+               uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
+               if (!p) return;
+               tunnelsend(b, len + (p-b), t); // send it...
+       }
+
+       // Snooping this session, send it to intercept box
+       if (sp->snoop_ip && sp->snoop_port)
+               snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
+
+       increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
+       sp->cout_delta += len;
+       sp->pout++;
+       udp_tx += len;
+
+       sess_local[s].cout += len;      // To send to master..
+       sess_local[s].pout++;
+}
+
+// process outgoing (to tunnel) IPv6
+//
+static void processipv6out(uint8_t * buf, int len)
+{
+       sessionidt s;
+       sessiont *sp;
+       tunnelidt t;
+       in_addr_t ip;
+       struct in6_addr ip6;
+
+       uint8_t *data = buf;    // Keep a copy of the originals.
+       int size = len;
+
+       uint8_t b[MAXETHER + 20];
+
+       CSTAT(processipv6out);
+
+       if (len < MIN_IP_SIZE)
+       {
+               LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
+               STAT(tunnel_tx_errors);
+               return;
+       }
+       if (len >= MAXETHER)
+       {
+               LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
+               STAT(tunnel_tx_errors);
+               return;
+       }
+
+       // Skip the tun header
+       buf += 4;
+       len -= 4;
+
+       // Got an IP header now
+       if (*(uint8_t *)(buf) >> 4 != 6)
+       {
+               LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
+               return;
+       }
+
+       ip6 = *(struct in6_addr *)(buf+24);
+       s = sessionbyipv6(ip6);
+
+       if (s == 0)
+       {
+               ip = *(uint32_t *)(buf + 32);
+               s = sessionbyip(ip);
+       }
+       
+       if (s == 0)
+       {
+               // Is this a packet for a session that doesn't exist?
+               static int rate = 0;    // Number of ICMP packets we've sent this second.
+               static int last = 0;    // Last time we reset the ICMP packet counter 'rate'.
+
+               if (last != time_now)

                {
                {

-                       LOG(3, session[s].ip, s, t, "failed to send packet in processipout.\n");
-                       return;
+                       last = time_now;
+                       rate = 0;
+               }
+
+               if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
+               {
+                       // FIXME: Should send icmp6 host unreachable

                }
                }

+               return;
+       }
+       t = session[s].tunnel;
+       sp = &session[s];
+
+       // FIXME: add DoS prevention/filters?
+
+       if (sp->tbf_out)
+       {
+               // Are we throttling this session?
+               if (config->cluster_iam_master)
+                       tbf_queue_packet(sp->tbf_out, data, size);
+               else
+                       master_throttle_packet(sp->tbf_out, data, size);
+               return;
+       }
+       else if (sp->walled_garden && !config->cluster_iam_master)
+       {
+               // We are walled-gardening this
+               master_garden_packet(s, data, size);
+               return;
+       }
+
+       LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
+
+       // Add on L2TP header
+       {
+               uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6);
+               if (!p) return;

                tunnelsend(b, len + (p-b), t); // send it...
        }
 
                tunnelsend(b, len + (p-b), t); // send it...
        }
 


@@ -795,28 +1282,30 @@ static void processipout(u8 * buf, int len)
        if (sp->snoop_ip && sp->snoop_port)
                snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
 
        if (sp->snoop_ip && sp->snoop_port)
                snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
 

-       sp->cout += len; // byte count
-       sp->total_cout += len; // byte count
+       increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
+       sp->cout_delta += len;

        sp->pout++;
        udp_tx += len;
        sp->pout++;
        udp_tx += len;

-       sess_count[s].cout += len;      // To send to master..
+
+       sess_local[s].cout += len;      // To send to master..
+       sess_local[s].pout++;

 }
 
 //
 // Helper routine for the TBF filters.
 // Used to send queued data in to the user!
 //
 }
 
 //
 // Helper routine for the TBF filters.
 // Used to send queued data in to the user!
 //

-static void send_ipout(sessionidt s, u8 *buf, int len)
+static void send_ipout(sessionidt s, uint8_t *buf, int len)

 {
        sessiont *sp;
        tunnelidt t;
 {
        sessiont *sp;
        tunnelidt t;

-       ipt ip;
+       in_addr_t ip;

 
 

-       u8 b[MAXETHER + 20];
+       uint8_t b[MAXETHER + 20];

 
        if (len < 0 || len > MAXETHER)
        {
 
        if (len < 0 || len > MAXETHER)
        {

-               LOG(1,0,0,0, "Odd size IP packet: %d bytes\n", len);
+               LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);

                return;
        }
 
                return;
        }
 


@@ -824,7 +1313,7 @@ static void send_ipout(sessionidt s, u8 *buf, int len)
        buf += 4;
        len -= 4;
 
        buf += 4;
        len -= 4;
 

-       ip = *(u32 *)(buf + 16);
+       ip = *(in_addr_t *)(buf + 16);

 
        if (!session[s].ip)
                return;
 
        if (!session[s].ip)
                return;


@@ -832,16 +1321,12 @@ static void send_ipout(sessionidt s, u8 *buf, int len)
        t = session[s].tunnel;
        sp = &session[s];
 
        t = session[s].tunnel;
        sp = &session[s];
 

-       LOG(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
+       LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);

 
        // Add on L2TP header
        {
 
        // Add on L2TP header
        {

-               u8 *p = makeppp(b, sizeof(b),  buf, len, t, s, PPPIP);
-               if (!p)
-               {
-                       LOG(3, session[s].ip, s, t, "failed to send packet in send_ipout.\n");
-                       return;
-               }
+               uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
+               if (!p) return;

                tunnelsend(b, len + (p-b), t); // send it...
        }
 
                tunnelsend(b, len + (p-b), t); // send it...
        }
 


@@ -849,59 +1334,61 @@ static void send_ipout(sessionidt s, u8 *buf, int len)
        if (sp->snoop_ip && sp->snoop_port)
                snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
 
        if (sp->snoop_ip && sp->snoop_port)
                snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
 

-       sp->cout += len; // byte count
-       sp->total_cout += len; // byte count
+       increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
+       sp->cout_delta += len;

        sp->pout++;
        udp_tx += len;
        sp->pout++;
        udp_tx += len;

-       sess_count[s].cout += len;      // To send to master..
+
+       sess_local[s].cout += len;      // To send to master..
+       sess_local[s].pout++;

 }
 
 // add an AVP (16 bit)
 }
 
 // add an AVP (16 bit)

-static void control16(controlt * c, u16 avp, u16 val, u8 m)
+static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)

 {
 {

-       u16 l = (m ? 0x8008 : 0x0008);
-       *(u16 *) (c->buf + c->length + 0) = htons(l);
-       *(u16 *) (c->buf + c->length + 2) = htons(0);
-       *(u16 *) (c->buf + c->length + 4) = htons(avp);
-       *(u16 *) (c->buf + c->length + 6) = htons(val);
+       uint16_t l = (m ? 0x8008 : 0x0008);
+       *(uint16_t *) (c->buf + c->length + 0) = htons(l);
+       *(uint16_t *) (c->buf + c->length + 2) = htons(0);
+       *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
+       *(uint16_t *) (c->buf + c->length + 6) = htons(val);

        c->length += 8;
 }
 
 // add an AVP (32 bit)
        c->length += 8;
 }
 
 // add an AVP (32 bit)

-static void control32(controlt * c, u16 avp, u32 val, u8 m)
+static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)

 {
 {

-       u16 l = (m ? 0x800A : 0x000A);
-       *(u16 *) (c->buf + c->length + 0) = htons(l);
-       *(u16 *) (c->buf + c->length + 2) = htons(0);
-       *(u16 *) (c->buf + c->length + 4) = htons(avp);
-       *(u32 *) (c->buf + c->length + 6) = htonl(val);
+       uint16_t l = (m ? 0x800A : 0x000A);
+       *(uint16_t *) (c->buf + c->length + 0) = htons(l);
+       *(uint16_t *) (c->buf + c->length + 2) = htons(0);
+       *(uint16_t *) (c->buf + c->length + 4) = htons(avp);
+       *(uint32_t *) (c->buf + c->length + 6) = htonl(val);

        c->length += 10;
 }
 
        c->length += 10;
 }
 

-// add an AVP (32 bit)
-static void controls(controlt * c, u16 avp, char *val, u8 m)
+// add an AVP (string)
+static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)

 {
 {

-       u16 l = ((m ? 0x8000 : 0) + strlen(val) + 6);
-       *(u16 *) (c->buf + c->length + 0) = htons(l);
-       *(u16 *) (c->buf + c->length + 2) = htons(0);
-       *(u16 *) (c->buf + c->length + 4) = htons(avp);
+       uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
+       *(uint16_t *) (c->buf + c->length + 0) = htons(l);
+       *(uint16_t *) (c->buf + c->length + 2) = htons(0);
+       *(uint16_t *) (c->buf + c->length + 4) = htons(avp);

        memcpy(c->buf + c->length + 6, val, strlen(val));
        c->length += 6 + strlen(val);
 }
 
 // add a binary AVP
        memcpy(c->buf + c->length + 6, val, strlen(val));
        c->length += 6 + strlen(val);
 }
 
 // add a binary AVP

-static void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m)
+static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)

 {
 {

-       u16 l = ((m ? 0x8000 : 0) + len + 6);
-       *(u16 *) (c->buf + c->length + 0) = htons(l);
-       *(u16 *) (c->buf + c->length + 2) = htons(0);
-       *(u16 *) (c->buf + c->length + 4) = htons(avp);
+       uint16_t l = ((m ? 0x8000 : 0) + len + 6);
+       *(uint16_t *) (c->buf + c->length + 0) = htons(l);
+       *(uint16_t *) (c->buf + c->length + 2) = htons(0);
+       *(uint16_t *) (c->buf + c->length + 4) = htons(avp);

        memcpy(c->buf + c->length + 6, val, len);
        c->length += 6 + len;
 }
 
 // new control connection
        memcpy(c->buf + c->length + 6, val, len);
        c->length += 6 + len;
 }
 
 // new control connection

-static controlt *controlnew(u16 mtype)
+static controlt *controlnew(uint16_t mtype)

 {
        controlt *c;
        if (!controlfree)
 {
        controlt *c;
        if (!controlfree)


@@ -913,7 +1400,7 @@ static controlt *controlnew(u16 mtype)
        }
        assert(c);
        c->next = 0;
        }
        assert(c);
        c->next = 0;

-       *(u16 *) (c->buf + 0) = htons(0xC802); // flags/ver
+       *(uint16_t *) (c->buf + 0) = htons(0xC802); // flags/ver

        c->length = 12;
        control16(c, 0, mtype, 1);
        return c;
        c->length = 12;
        control16(c, 0, mtype, 1);
        return c;


@@ -923,34 +1410,36 @@ static controlt *controlnew(u16 mtype)
 // (ZLB send).
 static void controlnull(tunnelidt t)
 {
 // (ZLB send).
 static void controlnull(tunnelidt t)
 {

-       u8 buf[12];
+       uint8_t buf[12];

        if (tunnel[t].controlc) // Messages queued; They will carry the ack.
                return;
 
        if (tunnel[t].controlc) // Messages queued; They will carry the ack.
                return;
 

-       *(u16 *) (buf + 0) = htons(0xC802); // flags/ver
-       *(u16 *) (buf + 2) = htons(12); // length
-       *(u16 *) (buf + 4) = htons(tunnel[t].far); // tunnel
-       *(u16 *) (buf + 6) = htons(0); // session
-       *(u16 *) (buf + 8) = htons(tunnel[t].ns); // sequence
-       *(u16 *) (buf + 10) = htons(tunnel[t].nr); // sequence
+       *(uint16_t *) (buf + 0) = htons(0xC802); // flags/ver
+       *(uint16_t *) (buf + 2) = htons(12); // length
+       *(uint16_t *) (buf + 4) = htons(tunnel[t].far); // tunnel
+       *(uint16_t *) (buf + 6) = htons(0); // session
+       *(uint16_t *) (buf + 8) = htons(tunnel[t].ns); // sequence
+       *(uint16_t *) (buf + 10) = htons(tunnel[t].nr); // sequence

        tunnelsend(buf, 12, t);
 }
 
 // add a control message to a tunnel, and send if within window
        tunnelsend(buf, 12, t);
 }
 
 // add a control message to a tunnel, and send if within window

-static void controladd(controlt * c, tunnelidt t, sessionidt s)
+static void controladd(controlt *c, sessionidt far, tunnelidt t)

 {
 {

-       *(u16 *) (c->buf + 2) = htons(c->length); // length
-       *(u16 *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
-       *(u16 *) (c->buf + 6) = htons(s ? session[s].far : 0); // session
-       *(u16 *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
+       *(uint16_t *) (c->buf + 2) = htons(c->length); // length
+       *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
+       *(uint16_t *) (c->buf + 6) = htons(far); // session
+       *(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence

        tunnel[t].ns++;              // advance sequence
        // link in message in to queue
        if (tunnel[t].controlc)
                tunnel[t].controle->next = c;
        else
                tunnel[t].controls = c;
        tunnel[t].ns++;              // advance sequence
        // link in message in to queue
        if (tunnel[t].controlc)
                tunnel[t].controle->next = c;
        else
                tunnel[t].controls = c;

+

        tunnel[t].controle = c;
        tunnel[t].controlc++;
        tunnel[t].controle = c;
        tunnel[t].controlc++;

+

        // send now if space in window
        if (tunnel[t].controlc <= tunnel[t].window)
        {
        // send now if space in window
        if (tunnel[t].controlc <= tunnel[t].window)
        {


@@ -971,7 +1460,7 @@ static void controladd(controlt * c, tunnelidt t, sessionidt s)
 //
 void throttle_session(sessionidt s, int rate_in, int rate_out)
 {
 //
 void throttle_session(sessionidt s, int rate_in, int rate_out)
 {

-       if (!session[s].tunnel)
+       if (!session[s].opened)

                return; // No-one home.
 
        if (!*session[s].user)
                return; // No-one home.
 
        if (!*session[s].user)


@@ -1006,146 +1495,234 @@ void throttle_session(sessionidt s, int rate_in, int rate_out)
        }
 }
 
        }
 }
 

+// add/remove filters from session (-1 = no change)
+void filter_session(sessionidt s, int filter_in, int filter_out)
+{
+       if (!session[s].opened)
+               return; // No-one home.
+
+       if (!*session[s].user)
+               return; // User not logged in
+
+       // paranoia
+       if (filter_in > MAXFILTER) filter_in = -1;
+       if (filter_out > MAXFILTER) filter_out = -1;
+       if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
+       if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
+
+       if (filter_in >= 0)
+       {
+               if (session[s].filter_in)
+                       ip_filters[session[s].filter_in - 1].used--;
+
+               if (filter_in > 0)
+                       ip_filters[filter_in - 1].used++;
+
+               session[s].filter_in = filter_in;
+       }
+
+       if (filter_out >= 0)
+       {
+               if (session[s].filter_out)
+                       ip_filters[session[s].filter_out - 1].used--;
+
+               if (filter_out > 0)
+                       ip_filters[filter_out - 1].used++;
+
+               session[s].filter_out = filter_out;
+       }
+}
+

 // start tidy shutdown of session
 // start tidy shutdown of session

-void sessionshutdown(sessionidt s, char *reason)
+void sessionshutdown(sessionidt s, char *reason, int result, int error)

 {
        int walled_garden = session[s].walled_garden;
 
 
 {
        int walled_garden = session[s].walled_garden;
 
 

-       CSTAT(call_sessionshutdown);
+       CSTAT(sessionshutdown);

 
 

-       if (!session[s].tunnel)
+       if (!session[s].opened)

        {
        {

-               LOG(3, session[s].ip, s, session[s].tunnel, "Called sessionshutdown on a session with no tunnel.\n");
+               LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");

                return;                   // not a live session
        }
 
        if (!session[s].die)
        {
                struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
                return;                   // not a live session
        }
 
        if (!session[s].die)
        {
                struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };

-               LOG(2, 0, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason);
+               LOG(2, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason);

                run_plugins(PLUGIN_KILL_SESSION, &data);
        }
 
                run_plugins(PLUGIN_KILL_SESSION, &data);
        }
 

-       // RADIUS Stop message
-       if (session[s].opened && !walled_garden && !session[s].die)
+       if (session[s].ip && !walled_garden && !session[s].die)

        {
        {

-               u16 r = session[s].radius;
-               if (!r)
+               // RADIUS Stop message
+               uint16_t r = radiusnew(s);
+               if (r)

                {
                {

-                       if (!(r = radiusnew(s)))
-                       {
-                               LOG(1, 0, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
-                               STAT(radius_overflow);
-                       }
-                       else
-                       {
-                               int n;
-                               for (n = 0; n < 15; n++)
-                                       radius[r].auth[n] = rand();
-                       }
+                       // stop, if not already trying
+                       if (radius[r].state != RADIUSSTOP)
+                               radiussend(r, RADIUSSTOP);

                }
                }

-               if (r && radius[r].state != RADIUSSTOP)
-                       radiussend(r, RADIUSSTOP); // stop, if not already trying
+               else
+                       LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
+
+               // Save counters to dump to accounting file
+               if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
+                       memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));

        }
 
        if (session[s].ip)
        {                          // IP allocated, clear and unroute
                int r;
        }
 
        if (session[s].ip)
        {                          // IP allocated, clear and unroute
                int r;

+               int routed = 0;

                for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                {
                for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                {

+                       if ((session[s].ip & session[s].route[r].mask) ==
+                           (session[s].route[r].ip & session[s].route[r].mask))
+                               routed++;
+

                        routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
                        session[s].route[r].ip = 0;
                }
 
                if (session[s].ip_pool_index == -1) // static ip
                {
                        routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
                        session[s].route[r].ip = 0;
                }
 
                if (session[s].ip_pool_index == -1) // static ip
                {

-                       routeset(s, session[s].ip, 0, 0, 0);    // Delete route.
+                       if (!routed) routeset(s, session[s].ip, 0, 0, 0);

                        session[s].ip = 0;
                }
                else
                        free_ip_address(s);
                        session[s].ip = 0;
                }
                else
                        free_ip_address(s);

+
+               // unroute IPv6, if setup
+               if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen)
+                       route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);

        }
 
        if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
                throttle_session(s, 0, 0);
 
        }
 
        if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
                throttle_session(s, 0, 0);
 

+       if (result)

        {                            // Send CDN
                controlt *c = controlnew(14); // sending CDN
        {                            // Send CDN
                controlt *c = controlnew(14); // sending CDN

-               control16(c, 1, 3, 1);    // result code (admin reasons - TBA make error, general error, add message
+               if (error)
+               {
+                       uint8_t buf[4];
+                       *(uint16_t *) buf     = htons(result);
+                       *(uint16_t *) (buf+2) = htons(error);
+                       controlb(c, 1, buf, 4, 1);
+               }
+               else
+                       control16(c, 1, result, 1);
+

                control16(c, 14, s, 1);   // assigned session (our end)
                control16(c, 14, s, 1);   // assigned session (our end)

-               controladd(c, session[s].tunnel, s); // send the message
+               controladd(c, session[s].far, session[s].tunnel); // send the message

        }
 
        if (!session[s].die)
        }
 
        if (!session[s].die)

-               session[s].die = now() + 150; // Clean up in 15 seconds
+               session[s].die = TIME + 150; // Clean up in 15 seconds
+
+       // update filter refcounts
+       if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
+       if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
+
+       // clear PPP state
+       memset(&session[s].ppp, 0, sizeof(session[s].ppp));
+       sess_local[s].lcp.restart = 0;
+       sess_local[s].ipcp.restart = 0;
+       sess_local[s].ipv6cp.restart = 0;
+       sess_local[s].ccp.restart = 0;

 
        cluster_send_session(s);
 }
 
 
        cluster_send_session(s);
 }
 

-void sendipcp(tunnelidt t, sessionidt s)
+void sendipcp(sessionidt s, tunnelidt t)

 {
 {

-       u8 buf[MAXCONTROL];
-       u16 r = session[s].radius;
-       u8 *q;
-
-       CSTAT(call_sendipcp);
+       uint8_t buf[MAXETHER];
+       uint8_t *q;

 
 

-       if (!r)
-               r = radiusnew(s);
-
-       if (radius[r].state != RADIUSIPCP)
-       {
-               radius[r].state = RADIUSIPCP;
-               radius[r].try = 0;
-       }
+       CSTAT(sendipcp);
+       LOG(3, s, t, "IPCP: send ConfigReq\n");

 
 

-       radius[r].retry = backoff(radius[r].try++);
-       if (radius[r].try > 10)
+       if (!session[s].unique_id)

        {
        {

-               radiusclear(r, s);      // Clear radius session.
-               sessionshutdown(s, "No reply on IPCP");
-               return;
+               if (!++last_id) ++last_id; // skip zero
+               session[s].unique_id = last_id;

        }
 
        }
 

-       q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
-       if (!q)
-       {
-               LOG(3, session[s].ip, s, t, "failed to send packet in sendipcp.\n");
-               return;
-       }
+       q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP);
+       if (!q) return;

 
        *q = ConfigReq;
 
        *q = ConfigReq;

-       q[1] = r << RADIUS_SHIFT;                    // ID, dont care, we only send one type of request
-       *(u16 *) (q + 2) = htons(10);
-       q[4] = 3;
-       q[5] = 6;
-       *(u32 *) (q + 6) = config->peer_address ? config->peer_address :
-                          config->bind_address ? config->bind_address :
-                          my_address; // send my IP
+       q[1] = session[s].unique_id & 0xf;      // ID, dont care, we only send one type of request
+       *(uint16_t *) (q + 2) = htons(10);      // packet length
+       q[4] = 3;                               // ip address option
+       q[5] = 6;                               // option length
+       *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
+                                config->bind_address ? config->bind_address :
+                                my_address; // send my IP

 
        tunnelsend(buf, 10 + (q - buf), t); // send it
 
        tunnelsend(buf, 10 + (q - buf), t); // send it

-       session[s].flags &= ~SF_IPCP_ACKED;     // Clear flag.

 }
 
 }
 

-// kill a session now
-static void sessionkill(sessionidt s, char *reason)
+void sendipv6cp(sessionidt s, tunnelidt t)

 {
 {

+       uint8_t buf[MAXETHER];
+       uint8_t *q;

 
 

-       CSTAT(call_sessionkill);
+       CSTAT(sendipv6cp);
+       LOG(3, s, t, "IPV6CP: send ConfigReq\n");

 
 

-       session[s].die = now();
-       sessionshutdown(s, reason);  // close radius/routes, etc.
-       if (session[s].radius)
-               radiusclear(session[s].radius, s); // cant send clean accounting data, session is killed
+       q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP);
+       if (!q) return;

 
 

-       LOG(2, 0, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
+       *q = ConfigReq;
+       q[1] = session[s].unique_id & 0xf;      // ID, don't care, we
+                                               // only send one type
+                                               // of request
+       *(uint16_t *) (q + 2) = htons(14);
+       q[4] = 1;                               // interface identifier option
+       q[5] = 10;                              // option length
+       *(uint32_t *) (q + 6) = 0;              // We'll be prefix::1
+       *(uint32_t *) (q + 10) = 0;
+       q[13] = 1;
+
+       tunnelsend(buf, 14 + (q - buf), t);     // send it
+}

 
 

+static void sessionclear(sessionidt s)
+{

        memset(&session[s], 0, sizeof(session[s]));
        memset(&session[s], 0, sizeof(session[s]));

+       memset(&sess_local[s], 0, sizeof(sess_local[s]));
+       memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
+

        session[s].tunnel = T_FREE;     // Mark it as free.
        session[s].next = sessionfree;
        sessionfree = s;
        session[s].tunnel = T_FREE;     // Mark it as free.
        session[s].next = sessionfree;
        sessionfree = s;

-       cli_session_actions[s].action = 0;
+}
+
+// kill a session now
+void sessionkill(sessionidt s, char *reason)
+{
+
+       CSTAT(sessionkill);
+
+       if (!session[s].opened) // not alive
+               return;
+
+       if (session[s].next)
+       {
+               LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%d)\n", session[s].next);
+               return;
+       }
+
+       session[s].die = TIME;
+       sessionshutdown(s, reason, 3, 0);  // close radius/routes, etc.
+       if (sess_local[s].radius)
+               radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
+
+       LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
+       sessionclear(s);

        cluster_send_session(s);
 }
 
        cluster_send_session(s);
 }
 


@@ -1162,7 +1739,7 @@ static void tunnelkill(tunnelidt t, char *reason)
        sessionidt s;
        controlt *c;
 
        sessionidt s;
        controlt *c;
 

-       CSTAT(call_tunnelkill);
+       CSTAT(tunnelkill);

 
        tunnel[t].state = TUNNELDIE;
 
 
        tunnel[t].state = TUNNELDIE;
 


@@ -1176,23 +1753,23 @@ static void tunnelkill(tunnelidt t, char *reason)
                controlfree = c;
        }
        // kill sessions
                controlfree = c;
        }
        // kill sessions

-       for (s = 1; s < MAXSESSION; s++)
+       for (s = 1; s <= config->cluster_highest_sessionid ; ++s)

                if (session[s].tunnel == t)
                        sessionkill(s, reason);
 
        // free tunnel
        tunnelclear(t);
                if (session[s].tunnel == t)
                        sessionkill(s, reason);
 
        // free tunnel
        tunnelclear(t);

-       LOG(1, 0, 0, t, "Kill tunnel %d: %s\n", t, reason);
-       cli_tunnel_actions[s].action = 0;
+       LOG(1, 0, t, "Kill tunnel %d: %s\n", t, reason);
+       cli_tunnel_actions[t].action = 0;

        cluster_send_tunnel(t);
 }
 
 // shut down a tunnel cleanly
        cluster_send_tunnel(t);
 }
 
 // shut down a tunnel cleanly

-static void tunnelshutdown(tunnelidt t, char *reason)
+static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)

 {
        sessionidt s;
 
 {
        sessionidt s;
 

-       CSTAT(call_tunnelshutdown);
+       CSTAT(tunnelshutdown);

 
        if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
        {
 
        if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
        {


@@ -1200,34 +1777,55 @@ static void tunnelshutdown(tunnelidt t, char *reason)
                tunnelkill(t, reason);
                return;
        }
                tunnelkill(t, reason);
                return;
        }

-       LOG(1, 0, 0, t, "Shutting down tunnel %d (%s)\n", t, reason);
+       LOG(1, 0, t, "Shutting down tunnel %d (%s)\n", t, reason);

 
        // close session
 
        // close session

-       for (s = 1; s < MAXSESSION; s++)
+       for (s = 1; s <= config->cluster_highest_sessionid ; ++s)

                if (session[s].tunnel == t)
                if (session[s].tunnel == t)

-                       sessionshutdown(s, reason);
+                       sessionshutdown(s, reason, 0, 0);

 
        tunnel[t].state = TUNNELDIE;
 
        tunnel[t].state = TUNNELDIE;

-       tunnel[t].die = now() + 700; // Clean up in 70 seconds
+       tunnel[t].die = TIME + 700; // Clean up in 70 seconds

        cluster_send_tunnel(t);
        // TBA - should we wait for sessions to stop?
        cluster_send_tunnel(t);
        // TBA - should we wait for sessions to stop?

-       {                            // Send StopCCN
-               controlt *c = controlnew(4); // sending StopCCN
-               control16(c, 1, 1, 1);    // result code (admin reasons - TBA make error, general error, add message
-               control16(c, 9, t, 1);    // assigned tunnel (our end)
-               controladd(c, t, 0);      // send the message
+       if (result) 
+       {
+               controlt *c = controlnew(4);    // sending StopCCN
+               if (error)
+               {
+                       uint8_t buf[64];
+                       int l = 4;
+                       *(uint16_t *) buf     = htons(result);
+                       *(uint16_t *) (buf+2) = htons(error);
+                       if (msg)
+                       {
+                               int m = strlen(msg);
+                               if (m + 4 > sizeof(buf))
+                                   m = sizeof(buf) - 4;
+
+                               memcpy(buf+4, msg, m);
+                               l += m;
+                       }
+
+                       controlb(c, 1, buf, l, 1);
+               }
+               else
+                       control16(c, 1, result, 1);
+
+               control16(c, 9, t, 1);          // assigned tunnel (our end)
+               controladd(c, 0, t);            // send the message

        }
 }
 
 // read and process packet on tunnel (UDP)
        }
 }
 
 // read and process packet on tunnel (UDP)

-void processudp(u8 * buf, int len, struct sockaddr_in *addr)
+void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)

 {
 {

-       char *chapresponse = NULL;
-       u16 l = len, t = 0, s = 0, ns = 0, nr = 0;
-       u8 *p = buf + 2;
+       uint8_t *chapresponse = NULL;
+       uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
+       uint8_t *p = buf + 2;

 
 
 
 

-       CSTAT(call_processudp);
+       CSTAT(processudp);

 
        udp_rx += len;
        udp_rx_pkt++;
 
        udp_rx += len;
        udp_rx_pkt++;


@@ -1236,69 +1834,72 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
        INC_STAT(tunnel_rx_bytes, len);
        if (len < 6)
        {
        INC_STAT(tunnel_rx_bytes, len);
        if (len < 6)
        {

-               LOG(1, ntohl(addr->sin_addr.s_addr), 0, 0, "Short UDP, %d bytes\n", len);
+               LOG(1, 0, 0, "Short UDP, %d bytes\n", len);

                STAT(tunnel_rx_errors);
                return;
        }
        if ((buf[1] & 0x0F) != 2)
        {
                STAT(tunnel_rx_errors);
                return;
        }
        if ((buf[1] & 0x0F) != 2)
        {

-               LOG(1, ntohl(addr->sin_addr.s_addr), 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2);
+               LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2);

                STAT(tunnel_rx_errors);
                return;
        }
        if (*buf & 0x40)
        {                          // length
                STAT(tunnel_rx_errors);
                return;
        }
        if (*buf & 0x40)
        {                          // length

-               l = ntohs(*(u16 *) p);
+               l = ntohs(*(uint16_t *) p);

                p += 2;
        }
                p += 2;
        }

-       t = ntohs(*(u16 *) p);
+       t = ntohs(*(uint16_t *) p);

        p += 2;
        p += 2;

-       s = ntohs(*(u16 *) p);
+       s = ntohs(*(uint16_t *) p);

        p += 2;
        if (s >= MAXSESSION)
        {
        p += 2;
        if (s >= MAXSESSION)
        {

-               LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid session ID\n");
+               LOG(1, s, t, "Received UDP packet with invalid session ID\n");

                STAT(tunnel_rx_errors);
                return;
        }
        if (t >= MAXTUNNEL)
        {
                STAT(tunnel_rx_errors);
                return;
        }
        if (t >= MAXTUNNEL)
        {

-               LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid tunnel ID\n");
+               LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");

                STAT(tunnel_rx_errors);
                return;
        }
        if (*buf & 0x08)
        {                          // ns/nr
                STAT(tunnel_rx_errors);
                return;
        }
        if (*buf & 0x08)
        {                          // ns/nr

-               ns = ntohs(*(u16 *) p);
+               ns = ntohs(*(uint16_t *) p);

                p += 2;
                p += 2;

-               nr = ntohs(*(u16 *) p);
+               nr = ntohs(*(uint16_t *) p);

                p += 2;
        }
        if (*buf & 0x02)
        {                          // offset
                p += 2;
        }
        if (*buf & 0x02)
        {                          // offset

-               u16 o = ntohs(*(u16 *) p);
+               uint16_t o = ntohs(*(uint16_t *) p);

                p += o + 2;
        }
        if ((p - buf) > l)
        {
                p += o + 2;
        }
        if ((p - buf) > l)
        {

-               LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Bad length %d>%d\n", (p - buf), l);
+               LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);

                STAT(tunnel_rx_errors);
                return;
        }
        l -= (p - buf);
                STAT(tunnel_rx_errors);
                return;
        }
        l -= (p - buf);

+
+       // used to time out old tunnels
+       if (t && tunnel[t].state == TUNNELOPEN)
+               tunnel[t].lastrec = time_now;
+

        if (*buf & 0x80)
        {                          // control
        if (*buf & 0x80)
        {                          // control

-               u16 message = 0xFFFF; // message type
-               u8 fatal = 0;
-               u8 mandatorymessage = 0;
-               u8 chap = 0;      // if CHAP being used
-               u16 asession = 0;  // assigned session
-               u32 amagic = 0;    // magic number
-               u8 aflags = 0;    // flags from last LCF
-               u16 version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
-               int requestchap = 0;    // do we request PAP instead of original CHAP request?
-               char called[MAXTEL] = ""; // called number
-               char calling[MAXTEL] = ""; // calling number
+               uint16_t message = 0xFFFF;      // message type
+               uint8_t fatal = 0;
+               uint8_t mandatory = 0;
+               uint16_t asession = 0;          // assigned session
+               uint32_t amagic = 0;            // magic number
+               uint8_t aflags = 0;             // flags from last LCF
+               uint16_t version = 0x0100;      // protocol version (we handle 0.0 as well and send that back just in case)
+               char called[MAXTEL] = "";       // called number
+               char calling[MAXTEL] = "";      // calling number

 
                if (!config->cluster_iam_master)
                {
 
                if (!config->cluster_iam_master)
                {


@@ -1306,16 +1907,18 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                        return;
                }
 
                        return;
                }
 

-               if ((*buf & 0xCA) != 0xC8)
+               // control messages must have bits 0x80|0x40|0x08
+               // (type, length and sequence) set, and bits 0x02|0x01
+               // (offset and priority) clear
+               if ((*buf & 0xCB) != 0xC8)

                {
                {

-                       LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Bad control header %02X\n", *buf);
+                       LOG(1, s, t, "Bad control header %02X\n", *buf);

                        STAT(tunnel_rx_errors);
                        return;
                }
                        STAT(tunnel_rx_errors);
                        return;
                }

-               LOG(3, ntohl(addr->sin_addr.s_addr), s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
-                               l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
-               // if no tunnel specified, assign one
-               if (!t)
+
+               // check for duplicate tunnel open message
+               if (!t && ns == 0)

                {
                        int i;
 
                {
                        int i;
 


@@ -1325,38 +1928,59 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                        for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
                        {
                                if (tunnel[i].state != TUNNELOPENING ||
                        for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
                        {
                                if (tunnel[i].state != TUNNELOPENING ||

-                                       tunnel[i].ip != ntohl(*(ipt *) & addr->sin_addr) ||
+                                       tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||

                                        tunnel[i].port != ntohs(addr->sin_port) )
                                        continue;
                                t = i;
                                        tunnel[i].port != ntohs(addr->sin_port) )
                                        continue;
                                t = i;

+                               LOG(3, s, t, "Duplicate SCCRQ?\n");

                                break;
                        }
                }
 
                                break;
                        }
                }
 

+               LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
+                       l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
+
+               // if no tunnel specified, assign one

                if (!t)
                {
                        if (!(t = new_tunnel()))
                        {
                if (!t)
                {
                        if (!(t = new_tunnel()))
                        {

-                               LOG(1, ntohl(addr->sin_addr.s_addr), 0, 0, "No more tunnels\n");
+                               LOG(1, 0, 0, "No more tunnels\n");

                                STAT(tunnel_overflow);
                                return;
                        }
                        tunnelclear(t);
                                STAT(tunnel_overflow);
                                return;
                        }
                        tunnelclear(t);

-                       tunnel[t].ip = ntohl(*(ipt *) & addr->sin_addr);
+                       tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);

                        tunnel[t].port = ntohs(addr->sin_port);
                        tunnel[t].window = 4; // default window
                        tunnel[t].port = ntohs(addr->sin_port);
                        tunnel[t].window = 4; // default window

-                       LOG(1, ntohl(addr->sin_addr.s_addr), 0, t, "   New tunnel from %u.%u.%u.%u/%u ID %d\n", tunnel[t].ip >> 24, tunnel[t].ip >> 16 & 255, tunnel[t].ip >> 8 & 255, tunnel[t].ip & 255, tunnel[t].port, t);

                        STAT(tunnel_created);
                        STAT(tunnel_created);

+                       LOG(1, 0, t, "   New tunnel from %s:%u ID %d\n",
+                               fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);

                }
 
                }
 

-               // This is used to time out old tunnels
-               tunnel[t].lastrec = time_now;
+                       // If the 'ns' just received is not the 'nr' we're
+                       // expecting, just send an ack and drop it.
+                       //
+                       // if 'ns' is less, then we got a retransmitted packet.
+                       // if 'ns' is greater than missed a packet. Either way
+                       // we should ignore it.
+               if (ns != tunnel[t].nr)
+               {
+                       // is this the sequence we were expecting?
+                       STAT(tunnel_rx_errors);
+                       LOG(1, 0, t, "   Out of sequence tunnel %d, (%d is not the expected %d)\n",
+                               t, ns, tunnel[t].nr);
+
+                       if (l)  // Is this not a ZLB?
+                               controlnull(t);
+                       return;
+               }

 
                // check sequence of this message
                {
                        int skip = tunnel[t].window; // track how many in-window packets are still in queue
                                // some to clear maybe?
 
                // check sequence of this message
                {
                        int skip = tunnel[t].window; // track how many in-window packets are still in queue
                                // some to clear maybe?

-                       while (tunnel[t].controlc && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
+                       while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))

                        {
                                controlt *c = tunnel[t].controls;
                                tunnel[t].controls = c->next;
                        {
                                controlt *c = tunnel[t].controls;
                                tunnel[t].controls = c->next;


@@ -1367,22 +1991,6 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                tunnel[t].try = 0; // we have progress
                        }
 
                                tunnel[t].try = 0; // we have progress
                        }
 

-                               // If the 'ns' just received is not the 'nr' we're
-                               // expecting, just send an ack and drop it.
-                               //
-                               // if 'ns' is less, then we got a retransmitted packet.
-                               // if 'ns' is greater than missed a packet. Either way
-                               // we should ignore it.
-                       if (ns != tunnel[t].nr)
-                       {
-                               // is this the sequence we were expecting?
-                               LOG(1, ntohl(addr->sin_addr.s_addr), 0, t, "   Out of sequence tunnel %d, (%d is not the expected %d)\n", t, ns, tunnel[t].nr);
-                               STAT(tunnel_rx_errors);
-
-                               if (l)  // Is this not a ZLB?
-                                       controlnull(t);
-                               return;
-                       }

                        // receiver advance (do here so quoted correctly in any sends below)
                        if (l) tunnel[t].nr = (ns + 1);
                        if (skip < 0) skip = 0;
                        // receiver advance (do here so quoted correctly in any sends below)
                        if (l) tunnel[t].nr = (ns + 1);
                        if (skip < 0) skip = 0;


@@ -1409,274 +2017,296 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                }
                if (l)
                {                     // if not a null message
                }
                if (l)
                {                     // if not a null message

+                       int result = 0;
+                       int error = 0;
+                       char *msg = 0;
+

                        // process AVPs
                        // process AVPs

-                       while (l && !(fatal & 0x80))
+                       while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP

                        {
                        {

-                               u16 n = (ntohs(*(u16 *) p) & 0x3FF);
-                               u8 *b = p;
-                               u8 flags = *p;
-                               u16 mtype;
-                               p += n;       // next
-                               if (l < n)
+                               uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
+                               uint8_t *b = p;
+                               uint8_t flags = *p;
+                               uint16_t mtype;
+                               if (n > l)

                                {
                                {

-                                       LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Invalid length in AVP\n");
+                                       LOG(1, s, t, "Invalid length in AVP\n");

                                        STAT(tunnel_rx_errors);
                                        STAT(tunnel_rx_errors);

-                                       fatal = flags;

                                        return;
                                }
                                        return;
                                }

+                               p += n;       // next

                                l -= n;
                                l -= n;

+                               if (flags & 0x3C) // reserved bits, should be clear
+                               {
+                                       LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
+                                       fatal = flags;
+                                       result = 2; // general error
+                                       error = 3; // reserved field non-zero
+                                       msg = 0;
+                                       continue; // next
+                               }
+                               b += 2;
+                               if (*(uint16_t *) (b))
+                               {
+                                       LOG(2, s, t, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b)));
+                                       fatal = flags;
+                                       result = 2; // general error
+                                       error = 6; // generic vendor-specific error
+                                       msg = "unsupported vendor-specific";
+                                       continue; // next
+                               }
+                               b += 2;
+                               mtype = ntohs(*(uint16_t *) (b));
+                               b += 2;
+                               n -= 6;
+

                                if (flags & 0x40)
                                {
                                if (flags & 0x40)
                                {

+                                       uint16_t orig_len;
+

                                        // handle hidden AVPs
                                        // handle hidden AVPs

-                                       if (!*config->l2tpsecret)
+                                       if (!*config->l2tp_secret)

                                        {
                                        {

-                                               LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no L2TP secret.\n");
+                                               LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");

                                                fatal = flags;
                                                fatal = flags;

+                                               result = 2; // general error
+                                               error = 6; // generic vendor-specific error
+                                               msg = "secret not specified";

                                                continue;
                                        }
                                        if (!session[s].random_vector_length)
                                        {
                                                continue;
                                        }
                                        if (!session[s].random_vector_length)
                                        {

-                                               LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP requested, but no random vector.\n");
+                                               LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");

                                                fatal = flags;
                                                fatal = flags;

+                                               result = 2; // general error
+                                               error = 6; // generic
+                                               msg = "no random vector";

                                                continue;
                                        }
                                                continue;
                                        }

-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP\n");
+                                       if (n < 8)
+                                       {
+                                               LOG(2, s, t, "Short hidden AVP.\n");
+                                               fatal = flags;
+                                               result = 2; // general error
+                                               error = 2; // length is wrong
+                                               msg = 0;
+                                               continue;
+                                       }
+

                                        // Unhide the AVP
                                        // Unhide the AVP

-                                       n = unhide_avp(b, t, s, n);
-                                       if (n == 0)
+                                       unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
+
+                                       orig_len = ntohs(*(uint16_t *) b);
+                                       if (orig_len > n + 2)

                                        {
                                        {

+                                               LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
+                                                   orig_len, n);
+

                                                fatal = flags;
                                                fatal = flags;

+                                               result = 2; // general error
+                                               error = 2; // length is wrong
+                                               msg = 0;

                                                continue;
                                        }
                                                continue;
                                        }

+
+                                       b += 2;
+                                       n = orig_len;

                                }
                                }

-                               if (*b & 0x3C)
-                               {
-                                       LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Unrecognised AVP flags %02X\n", *b);
-                                       fatal = flags;
-                                       continue; // next
-                               }
-                               b += 2;
-                               if (*(u16 *) (b))
-                               {
-                                       LOG(2, ntohl(addr->sin_addr.s_addr), s, t, "Unknown AVP vendor %d\n", ntohs(*(u16 *) (b)));
-                                       fatal = flags;
-                                       continue; // next
-                               }
-                               b += 2;
-                               mtype = ntohs(*(u16 *) (b));
-                               b += 2;
-                               n -= 6;

 
 

-                               LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   AVP %d (%s) len %d\n", mtype, avpnames[mtype], n);
+                               LOG(4, s, t, "   AVP %d (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
+                                       flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
+

                                switch (mtype)
                                {
                                case 0:     // message type
                                switch (mtype)
                                {
                                case 0:     // message type

-                                       message = ntohs(*(u16 *) b);
-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Message type = %d (%s)\n", *b,
-                                                       l2tp_message_types[message]);
-                                       mandatorymessage = flags;
+                                       message = ntohs(*(uint16_t *) b);
+                                       mandatory = flags & 0x80;
+                                       LOG(4, s, t, "   Message type = %d (%s)\n", *b, l2tp_code(message));

                                        break;
                                case 1:     // result code
                                        {
                                        break;
                                case 1:     // result code
                                        {

-                                               u16 rescode = ntohs(*(u16 *)(b));
+                                               uint16_t rescode = ntohs(*(uint16_t *) b);

                                                const char* resdesc = "(unknown)";
                                                if (message == 4)
                                                { /* StopCCN */
                                                const char* resdesc = "(unknown)";
                                                if (message == 4)
                                                { /* StopCCN */

-                                                       if (rescode <= MAX_STOPCCN_RESULT_CODE)
-                                                               resdesc = stopccn_result_codes[rescode];
+                                                       resdesc = l2tp_stopccn_result_code(rescode);

                                                }
                                                else if (message == 14)
                                                { /* CDN */
                                                }
                                                else if (message == 14)
                                                { /* CDN */

-                                                       if (rescode <= MAX_CDN_RESULT_CODE)
-                                                               resdesc = cdn_result_codes[rescode];
+                                                       resdesc = l2tp_cdn_result_code(rescode);

                                                }
 
                                                }
 

-                                               LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Result Code %d: %s\n",
-                                                       rescode, resdesc);
+                                               LOG(4, s, t, "   Result Code %d: %s\n", rescode, resdesc);

                                                if (n >= 4)
                                                {
                                                if (n >= 4)
                                                {

-                                                       u16 errcode = ntohs(*(u16 *)(b + 2));
-                                                       const char* errdesc = "(unknown)";
-                                                       if (errcode <= MAX_ERROR_CODE)
-                                                               errdesc = error_codes[errcode];
-                                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Error Code %d: %s\n",
-                                                               errcode, errdesc);
+                                                       uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
+                                                       LOG(4, s, t, "   Error Code %d: %s\n", errcode, l2tp_error_code(errcode));

                                                }
                                                if (n > 4)
                                                }
                                                if (n > 4)

-                                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Error String: %.*s\n",
-                                                               n-4, b+4);
+                                                       LOG(4, s, t, "   Error String: %.*s\n", n-4, b+4);

 
                                                break;
                                        }
                                        break;
                                case 2:     // protocol version
                                        {
 
                                                break;
                                        }
                                        break;
                                case 2:     // protocol version
                                        {

-                                               version = ntohs(*(u16 *) (b));
-                                               LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Protocol version = %d\n", version);
+                                               version = ntohs(*(uint16_t *) (b));
+                                               LOG(4, s, t, "   Protocol version = %d\n", version);

                                                if (version && version != 0x0100)
                                                {   // allow 0.0 and 1.0
                                                if (version && version != 0x0100)
                                                {   // allow 0.0 and 1.0

-                                                       LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "   Bad protocol version %04X\n",
-                                                                       version);
+                                                       LOG(1, s, t, "   Bad protocol version %04X\n", version);

                                                        fatal = flags;
                                                        fatal = flags;

+                                                       result = 5; // unspported protocol version
+                                                       error = 0x0100; // supported version
+                                                       msg = 0;

                                                        continue; // next
                                                }
                                        }
                                        break;
                                case 3:     // framing capabilities
                                                        continue; // next
                                                }
                                        }
                                        break;
                                case 3:     // framing capabilities

-//                                     LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Framing capabilities\n");
+//                                     LOG(4, s, t, "Framing capabilities\n");

                                        break;
                                case 4:     // bearer capabilities
                                        break;
                                case 4:     // bearer capabilities

-//                                     LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Bearer capabilities\n");
+//                                     LOG(4, s, t, "Bearer capabilities\n");

                                        break;
                                case 5:         // tie breaker
                                        // We never open tunnels, so we don't care about tie breakers
                                        break;
                                case 5:         // tie breaker
                                        // We never open tunnels, so we don't care about tie breakers

-//                                     LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Tie breaker\n");
+//                                     LOG(4, s, t, "Tie breaker\n");

                                        continue;
                                case 6:     // firmware revision
                                        continue;
                                case 6:     // firmware revision

-//                                     LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "Firmware revision\n");
+//                                     LOG(4, s, t, "Firmware revision\n");

                                        break;
                                case 7:     // host name
                                        break;
                                case 7:     // host name

-                                       memset(tunnel[t].hostname, 0, 128);
-                                       memcpy(tunnel[t].hostname, b, (n >= 127) ? 127 : n);
-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
+                                       memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
+                                       memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
+                                       LOG(4, s, t, "   Tunnel hostname = \"%s\"\n", tunnel[t].hostname);

                                        // TBA - to send to RADIUS
                                        break;
                                case 8:     // vendor name
                                        memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
                                        // TBA - to send to RADIUS
                                        break;
                                case 8:     // vendor name
                                        memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));

-                                       memcpy(tunnel[t].vendor, b, (n >= sizeof(tunnel[t].vendor) - 1) ? sizeof(tunnel[t].vendor) - 1 : n);
-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Vendor name = \"%s\"\n", tunnel[t].vendor);
+                                       memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
+                                       LOG(4, s, t, "   Vendor name = \"%s\"\n", tunnel[t].vendor);

                                        break;
                                case 9:     // assigned tunnel
                                        break;
                                case 9:     // assigned tunnel

-                                       tunnel[t].far = ntohs(*(u16 *) (b));
-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Remote tunnel id = %d\n", tunnel[t].far);
+                                       tunnel[t].far = ntohs(*(uint16_t *) (b));
+                                       LOG(4, s, t, "   Remote tunnel id = %d\n", tunnel[t].far);

                                        break;
                                case 10:    // rx window
                                        break;
                                case 10:    // rx window

-                                       tunnel[t].window = ntohs(*(u16 *) (b));
+                                       tunnel[t].window = ntohs(*(uint16_t *) (b));

                                        if (!tunnel[t].window)
                                                tunnel[t].window = 1; // window of 0 is silly
                                        if (!tunnel[t].window)
                                                tunnel[t].window = 1; // window of 0 is silly

-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   rx window = %d\n", tunnel[t].window);
+                                       LOG(4, s, t, "   rx window = %d\n", tunnel[t].window);

                                        break;
                                case 11:        // Challenge
                                        {
                                        break;
                                case 11:        // Challenge
                                        {

-                                               LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   LAC requested CHAP authentication for tunnel\n");
+                                               LOG(4, s, t, "   LAC requested CHAP authentication for tunnel\n");

                                                build_chap_response(b, 2, n, &chapresponse);
                                        }
                                        break;
                                case 13:    // Response
                                        // Why did they send a response? We never challenge.
                                                build_chap_response(b, 2, n, &chapresponse);
                                        }
                                        break;
                                case 13:    // Response
                                        // Why did they send a response? We never challenge.

-                                       LOG(2, ntohl(addr->sin_addr.s_addr), s, t, "   received unexpected challenge response\n");
+                                       LOG(2, s, t, "   received unexpected challenge response\n");

                                        break;
 
                                case 14:    // assigned session
                                        break;
 
                                case 14:    // assigned session

-                                       asession = session[s].far = ntohs(*(u16 *) (b));
-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   assigned session = %d\n", asession);
+                                       asession = session[s].far = ntohs(*(uint16_t *) (b));
+                                       LOG(4, s, t, "   assigned session = %d\n", asession);

                                        break;
                                case 15:    // call serial number
                                        break;
                                case 15:    // call serial number

-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   call serial number = %d\n", ntohl(*(u32 *)b));
+                                       LOG(4, s, t, "   call serial number = %d\n", ntohl(*(uint32_t *)b));

                                        break;
                                case 18:    // bearer type
                                        break;
                                case 18:    // bearer type

-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   bearer type = %d\n", ntohl(*(u32 *)b));
+                                       LOG(4, s, t, "   bearer type = %d\n", ntohl(*(uint32_t *)b));

                                        // TBA - for RADIUS
                                        break;
                                case 19:    // framing type
                                        // TBA - for RADIUS
                                        break;
                                case 19:    // framing type

-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   framing type = %d\n", ntohl(*(u32 *)b));
+                                       LOG(4, s, t, "   framing type = %d\n", ntohl(*(uint32_t *)b));

                                        // TBA
                                        break;
                                case 21:    // called number
                                        // TBA
                                        break;
                                case 21:    // called number

-                                       memset(called, 0, MAXTEL);
-                                       memcpy(called, b, (n >= MAXTEL) ? (MAXTEL-1) : n);
-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Called <%s>\n", called);
+                                       memset(called, 0, sizeof(called));
+                                       memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
+                                       LOG(4, s, t, "   Called <%s>\n", called);

                                        break;
                                case 22:    // calling number
                                        break;
                                case 22:    // calling number

-                                       memset(calling, 0, MAXTEL);
-                                       memcpy(calling, b, (n >= MAXTEL) ? (MAXTEL-1) : n);
-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Calling <%s>\n", calling);
+                                       memset(calling, 0, sizeof(calling));
+                                       memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
+                                       LOG(4, s, t, "   Calling <%s>\n", calling);

                                        break;
                                case 23:    // subtype
                                        break;
                                case 24:    // tx connect speed
                                        if (n == 4)
                                        {
                                        break;
                                case 23:    // subtype
                                        break;
                                case 24:    // tx connect speed
                                        if (n == 4)
                                        {

-                                               session[s].tx_connect_speed = ntohl(*(u32 *)b);
+                                               session[s].tx_connect_speed = ntohl(*(uint32_t *)b);

                                        }
                                        else
                                        {
                                                // AS5300s send connect speed as a string
                                        }
                                        else
                                        {
                                                // AS5300s send connect speed as a string

-                                               char tmp[30] = {0};
-                                               memcpy(tmp, b, (n >= 30) ? 30 : n);
+                                               char tmp[30];
+                                               memset(tmp, 0, sizeof(tmp));
+                                               memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);

                                                session[s].tx_connect_speed = atol(tmp);
                                        }
                                                session[s].tx_connect_speed = atol(tmp);
                                        }

-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   TX connect speed <%u>\n",
-                                                       session[s].tx_connect_speed);
+                                       LOG(4, s, t, "   TX connect speed <%u>\n", session[s].tx_connect_speed);

                                        break;
                                case 38:    // rx connect speed
                                        if (n == 4)
                                        {
                                        break;
                                case 38:    // rx connect speed
                                        if (n == 4)
                                        {

-                                               session[s].rx_connect_speed = ntohl(*(u32 *)b);
+                                               session[s].rx_connect_speed = ntohl(*(uint32_t *)b);

                                        }
                                        else
                                        {
                                                // AS5300s send connect speed as a string
                                        }
                                        else
                                        {
                                                // AS5300s send connect speed as a string

-                                               char tmp[30] = {0};
-                                               memcpy(tmp, b, (n >= 30) ? 30 : n);
+                                               char tmp[30];
+                                               memset(tmp, 0, sizeof(tmp));
+                                               memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);

                                                session[s].rx_connect_speed = atol(tmp);
                                        }
                                                session[s].rx_connect_speed = atol(tmp);
                                        }

-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   RX connect speed <%u>\n",
-                                                       session[s].rx_connect_speed);
+                                       LOG(4, s, t, "   RX connect speed <%u>\n", session[s].rx_connect_speed);

                                        break;
                                case 25:    // Physical Channel ID
                                        {
                                        break;
                                case 25:    // Physical Channel ID
                                        {

-                                               u32 tmp = ntohl(*(u32 *)b);
-                                               LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Physical Channel ID <%X>\n", tmp);
+                                               uint32_t tmp = ntohl(*(uint32_t *) b);
+                                               LOG(4, s, t, "   Physical Channel ID <%X>\n", tmp);

                                                break;
                                        }
                                case 29:    // Proxy Authentication Type
                                        {
                                                break;
                                        }
                                case 29:    // Proxy Authentication Type
                                        {

-                                               u16 authtype = ntohs(*(u16 *)b);
-                                               LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Proxy Auth Type %d (%s)\n",
-                                                       authtype, authtypes[authtype]);
-                                               requestchap = (authtype == 2);
+                                               uint16_t atype = ntohs(*(uint16_t *)b);
+                                               LOG(4, s, t, "   Proxy Auth Type %d (%s)\n", atype, ppp_auth_type(atype));

                                                break;
                                        }
                                case 30:    // Proxy Authentication Name
                                        {
                                                break;
                                        }
                                case 30:    // Proxy Authentication Name
                                        {

-                                               char authname[64] = {0};
-                                               memcpy(authname, b, (n > 63) ? 63 : n);
-                                               LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Proxy Auth Name (%s)\n",
+                                               char authname[64];
+                                               memset(authname, 0, sizeof(authname));
+                                               memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
+                                               LOG(4, s, t, "   Proxy Auth Name (%s)\n",

                                                        authname);
                                                break;
                                        }
                                case 31:    // Proxy Authentication Challenge
                                        {
                                                        authname);
                                                break;
                                        }
                                case 31:    // Proxy Authentication Challenge
                                        {

-                                               memcpy(radius[session[s].radius].auth, b, 16);
-                                               LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Proxy Auth Challenge\n");
+                                               LOG(4, s, t, "   Proxy Auth Challenge\n");

                                                break;
                                        }
                                case 32:    // Proxy Authentication ID
                                        {
                                                break;
                                        }
                                case 32:    // Proxy Authentication ID
                                        {

-                                               u16 authid = ntohs(*(u16 *)(b));
-                                               LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Proxy Auth ID (%d)\n",
-                                                       authid);
-                                               if (session[s].radius)
-                                                       radius[session[s].radius].id = authid;
+                                               uint16_t authid = ntohs(*(uint16_t *)(b));
+                                               LOG(4, s, t, "   Proxy Auth ID (%d)\n", authid);

                                                break;
                                        }
                                case 33:    // Proxy Authentication Response
                                                break;
                                        }
                                case 33:    // Proxy Authentication Response

-                                       {
-                                               char authresp[64] = {0};
-                                               memcpy(authresp, b, (n > 63) ? 63 : n);
-                                               LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Proxy Auth Response\n");
-                                               break;
-                                       }
-                               case 27:    // last send lcp
+                                       LOG(4, s, t, "   Proxy Auth Response\n");
+                                       break;
+                               case 27:    // last sent lcp

                                        {        // find magic number
                                        {        // find magic number

-                                               u8 *p = b, *e = p + n;
+                                               uint8_t *p = b, *e = p + n;

                                                while (p + 1 < e && p[1] && p + p[1] <= e)
                                                {
                                                        if (*p == 5 && p[1] == 6) // Magic-Number
                                                while (p + 1 < e && p[1] && p + p[1] <= e)
                                                {
                                                        if (*p == 5 && p[1] == 6) // Magic-Number

-                                                               amagic = ntohl(*(u32 *) (p + 2));
-                                                       else if (*p == 3 && p[1] == 5 && *(u16 *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol
-                                                               chap = 1;
+                                                               amagic = ntohl(*(uint32_t *) (p + 2));

                                                        else if (*p == 7) // Protocol-Field-Compression
                                                                aflags |= SESSIONPFC;
                                                        else if (*p == 8) // Address-and-Control-Field-Compression
                                                        else if (*p == 7) // Protocol-Field-Compression
                                                                aflags |= SESSIONPFC;
                                                        else if (*p == 8) // Address-and-Control-Field-Compression


@@ -1692,34 +2322,47 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                case 39:    // seq required - we control it as an LNS anyway...
                                        break;
                                case 36:    // Random Vector
                                case 39:    // seq required - we control it as an LNS anyway...
                                        break;
                                case 36:    // Random Vector

-                                       LOG(4, ntohl(addr->sin_addr.s_addr), s, t, "   Random Vector received. Enabled AVP Hiding.\n");
+                                       LOG(4, s, t, "   Random Vector received.  Enabled AVP Hiding.\n");

                                        memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
                                        memset(session[s].random_vector, 0, sizeof(session[s].random_vector));

+                                       if (n > sizeof(session[s].random_vector))
+                                               n = sizeof(session[s].random_vector);

                                        memcpy(session[s].random_vector, b, n);
                                        session[s].random_vector_length = n;
                                        break;
                                default:
                                        memcpy(session[s].random_vector, b, n);
                                        session[s].random_vector_length = n;
                                        break;
                                default:

-                                       LOG(2, ntohl(addr->sin_addr.s_addr), s, t, "   Unknown AVP type %d\n", mtype);
-                                       fatal = flags;
-                                       continue; // next
+                                       {
+                                               static char e[] = "unknown AVP 0xXXXX";
+                                               LOG(2, s, t, "   Unknown AVP type %d\n", mtype);
+                                               fatal = flags;
+                                               result = 2; // general error
+                                               error = 8; // unknown mandatory AVP
+                                               sprintf((msg = e) + 14, "%04x", mtype);
+                                               continue; // next
+                                       }

                                }
                        }
                        // process message
                        if (fatal & 0x80)
                                }
                        }
                        // process message
                        if (fatal & 0x80)

-                               tunnelshutdown(t, "Unknown Mandatory AVP");
+                               tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);

                        else
                                switch (message)
                                {
                                case 1:       // SCCRQ - Start Control Connection Request
                        else
                                switch (message)
                                {
                                case 1:       // SCCRQ - Start Control Connection Request

+                                       tunnel[t].state = TUNNELOPENING;
+                                       if (main_quit != QUIT_SHUTDOWN)

                                        {
                                                controlt *c = controlnew(2); // sending SCCRP
                                                control16(c, 2, version, 1); // protocol version
                                                control32(c, 3, 3, 1); // framing
                                        {
                                                controlt *c = controlnew(2); // sending SCCRP
                                                control16(c, 2, version, 1); // protocol version
                                                control32(c, 3, 3, 1); // framing

-                                               controls(c, 7, tunnel[t].hostname, 1); // host name (TBA)
+                                               controls(c, 7, hostname, 1); // host name

                                                if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
                                                control16(c, 9, t, 1); // assigned tunnel
                                                if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
                                                control16(c, 9, t, 1); // assigned tunnel

-                                               controladd(c, t, s); // send the resply
+                                               controladd(c, 0, t); // send the resply
+                                       }
+                                       else
+                                       {
+                                               tunnelshutdown(t, "Shutting down", 6, 0, 0);

                                        }
                                        }

-                                       tunnel[t].state = TUNNELOPENING;

                                        break;
                                case 2:       // SCCRP
                                        tunnel[t].state = TUNNELOPEN;
                                        break;
                                case 2:       // SCCRP
                                        tunnel[t].state = TUNNELOPEN;


@@ -1730,8 +2373,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                        break;
                                case 4:       // StopCCN
                                        controlnull(t); // ack
                                        break;
                                case 4:       // StopCCN
                                        controlnull(t); // ack

-                                       tunnelshutdown(t, "Stopped"); // Shut down cleanly
-                                       tunnelkill(t, "Stopped"); // Immediately force everything dead
+                                       tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly

                                        break;
                                case 6:       // HELLO
                                        controlnull(t); // simply ACK
                                        break;
                                case 6:       // HELLO
                                        controlnull(t); // simply ACK


@@ -1746,15 +2388,9 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                        // TBA
                                        break;
                                case 10:      // ICRQ
                                        // TBA
                                        break;
                                case 10:      // ICRQ

-                                       if (!sessionfree)
-                                       {
-                                               STAT(session_overflow);
-                                               tunnelshutdown(t, "No free sessions");
-                                       }
-                                       else
+                                       if (sessionfree && main_quit != QUIT_SHUTDOWN)

                                        {
                                        {

-                                               u16 r;
-                                               controlt *c;
+                                               controlt *c = controlnew(11); // ICRP

 
                                                s = sessionfree;
                                                sessionfree = session[s].next;
 
                                                s = sessionfree;
                                                sessionfree = session[s].next;


@@ -1763,35 +2399,38 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                                if (s > config->cluster_highest_sessionid)
                                                        config->cluster_highest_sessionid = s;
 
                                                if (s > config->cluster_highest_sessionid)
                                                        config->cluster_highest_sessionid = s;
 

-                                               // make a RADIUS session
-                                               if (!(r = radiusnew(s)))
-                                               {
-                                                       LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "No free RADIUS sessions for ICRQ\n");
-                                                       sessionkill(s, "no free RADIUS sesions");
-                                                       return;
-                                               }
-
-                                               c = controlnew(11); // sending ICRP
-                                               session[s].id = sessionid++;
-                                               session[s].opened = time(NULL);
+                                               session[s].opened = time_now;

                                                session[s].tunnel = t;
                                                session[s].far = asession;
                                                session[s].last_packet = time_now;
                                                session[s].tunnel = t;
                                                session[s].far = asession;
                                                session[s].last_packet = time_now;

-                                               LOG(3, ntohl(addr->sin_addr.s_addr), s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far);
+                                               LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far);

                                                control16(c, 14, s, 1); // assigned session
                                                control16(c, 14, s, 1); // assigned session

-                                               controladd(c, t, s); // send the reply
-                                               {
-                                                       // Generate a random challenge
-                                                       int n;
-                                                       for (n = 0; n < 15; n++)
-                                                               radius[r].auth[n] = rand();
-                                               }
-                                               strncpy(radius[r].calling, calling, sizeof(radius[r].calling) - 1);
+                                               controladd(c, asession, t); // send the reply
+

                                                strncpy(session[s].called, called, sizeof(session[s].called) - 1);
                                                strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
                                                strncpy(session[s].called, called, sizeof(session[s].called) - 1);
                                                strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);

+
+                                               session[s].ppp.phase = Establish;
+                                               session[s].ppp.lcp = Starting;
+

                                                STAT(session_created);
                                                STAT(session_created);

+                                               break;

                                        }
                                        }

-                                       break;
+
+                                       {
+                                               controlt *c = controlnew(14); // CDN
+                                               if (!sessionfree)
+                                               {
+                                                       STAT(session_overflow);
+                                                       LOG(1, 0, t, "No free sessions\n");
+                                                       control16(c, 1, 4, 0); // temporary lack of resources
+                                               }
+                                               else
+                                                       control16(c, 1, 2, 7); // shutting down, try another
+
+                                               controladd(c, asession, t); // send the message
+                                       }
+                                       return;

                                case 11:      // ICRP
                                        // TBA
                                        break;
                                case 11:      // ICRP
                                        // TBA
                                        break;


@@ -1799,25 +2438,32 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                        if (amagic == 0) amagic = time_now;
                                        session[s].magic = amagic; // set magic number
                                        session[s].l2tp_flags = aflags; // set flags received
                                        if (amagic == 0) amagic = time_now;
                                        session[s].magic = amagic; // set magic number
                                        session[s].l2tp_flags = aflags; // set flags received

-                                       LOG(3, ntohl(addr->sin_addr.s_addr), s, t, "Magic %X Flags %X\n", amagic, aflags);
+                                       session[s].mru = PPPMTU; // default

                                        controlnull(t); // ack
                                        controlnull(t); // ack

-                                       // In CHAP state, request PAP instead
-                                       if (requestchap)
-                                               initlcp(t, s);
+
+                                       // start LCP
+                                       sess_local[s].lcp.restart = time_now + config->ppp_restart_time;
+                                       sess_local[s].lcp.conf_sent = 1;
+                                       sess_local[s].lcp.nak_sent = 0;
+                                       sess_local[s].lcp_authtype = config->radius_authprefer;
+                                       sess_local[s].ppp_mru = MRU;
+                                       session[s].ppp.lcp = RequestSent;
+                                       sendlcp(s, t);
+

                                        break;
                                case 14:      // CDN
                                        controlnull(t); // ack
                                        break;
                                case 14:      // CDN
                                        controlnull(t); // ack

-                                       sessionshutdown(s, "Closed (Received CDN)");
+                                       sessionshutdown(s, "Closed (Received CDN).", 0, 0);

                                        break;
                                case 0xFFFF:
                                        break;
                                case 0xFFFF:

-                                       LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Missing message type\n");
+                                       LOG(1, s, t, "Missing message type\n");

                                        break;
                                default:
                                        STAT(tunnel_rx_errors);
                                        break;
                                default:
                                        STAT(tunnel_rx_errors);

-                                       if (mandatorymessage & 0x80)
-                                               tunnelshutdown(t, "Unknown message");
+                                       if (mandatory)
+                                               tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");

                                        else
                                        else

-                                               LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown message type %d\n", message);
+                                               LOG(1, s, t, "Unknown message type %d\n", message);

                                        break;
                                }
                        if (chapresponse) free(chapresponse);
                                        break;
                                }
                        if (chapresponse) free(chapresponse);


@@ -1825,12 +2471,12 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                }
                else
                {
                }
                else
                {

-                       LOG(4, 0, s, t, "   Got a ZLB ack\n");
+                       LOG(4, s, t, "   Got a ZLB ack\n");

                }
        }
        else
        {                          // data
                }
        }
        else
        {                          // data

-               u16 prot;
+               uint16_t proto;

 
                LOG_HEX(5, "Receive Tunnel Data", p, l);
                if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
 
                LOG_HEX(5, "Receive Tunnel Data", p, l);
                if (l > 2 && p[0] == 0xFF && p[1] == 0x03)


@@ -1840,23 +2486,23 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                }
                if (l < 2)
                {
                }
                if (l < 2)
                {

-                       LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Short ppp length %d\n", l);
+                       LOG(1, s, t, "Short ppp length %d\n", l);

                        STAT(tunnel_rx_errors);
                        return;
                }
                if (*p & 1)
                {
                        STAT(tunnel_rx_errors);
                        return;
                }
                if (*p & 1)
                {

-                       prot = *p++;
+                       proto = *p++;

                        l--;
                }
                else
                {
                        l--;
                }
                else
                {

-                       prot = ntohs(*(u16 *) p);
+                       proto = ntohs(*(uint16_t *) p);

                        p += 2;
                        l -= 2;
                }
 
                        p += 2;
                        l -= 2;
                }
 

-               if (s && !session[s].tunnel)    // Is something wrong??
+               if (s && !session[s].opened)    // Is something wrong??

                {
                        if (!config->cluster_iam_master)
                        {
                {
                        if (!config->cluster_iam_master)
                        {


@@ -1866,125 +2512,197 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                        }
 
 
                        }
 
 

-                       LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "UDP packet contains session %d "
-                                       "but no session[%d].tunnel exists (LAC said"
-                                       " tunnel = %d). Dropping packet.\n", s, s, t);
+                       LOG(1, s, t, "UDP packet contains session which is not opened.  Dropping packet.\n");

                        STAT(tunnel_rx_errors);
                        return;
                }
 
                        STAT(tunnel_rx_errors);
                        return;
                }
 

-               if (session[s].die)
+               if (proto == PPPPAP)

                {
                {

-                       LOG(3, ntohl(addr->sin_addr.s_addr), s, t, "Session %d is closing. Don't process PPP packets\n", s);
-// I'm pretty sure this isn't right -- mo.
-//                     return;              // closing session, PPP not processed
+                       session[s].last_packet = time_now;
+                       if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
+                       processpap(s, t, p, l);

                }
                }

-               if (prot == PPPPAP)
+               else if (proto == PPPCHAP)

                {
                        session[s].last_packet = time_now;
                        if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
                {
                        session[s].last_packet = time_now;
                        if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }

-                       processpap(t, s, p, l);
+                       processchap(s, t, p, l);

                }
                }

-               else if (prot == PPPCHAP)
+               else if (proto == PPPLCP)

                {
                        session[s].last_packet = time_now;
                        if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
                {
                        session[s].last_packet = time_now;
                        if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }

-                       processchap(t, s, p, l);
+                       processlcp(s, t, p, l);

                }
                }

-               else if (prot == PPPLCP)
+               else if (proto == PPPIPCP)

                {
                        session[s].last_packet = time_now;
                        if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
                {
                        session[s].last_packet = time_now;
                        if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }

-                       processlcp(t, s, p, l);
+                       processipcp(s, t, p, l);

                }
                }

-               else if (prot == PPPIPCP)
+               else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])

                {
                        session[s].last_packet = time_now;
                        if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
                {
                        session[s].last_packet = time_now;
                        if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }

-                       processipcp(t, s, p, l);
+                       processipv6cp(s, t, p, l);

                }
                }

-               else if (prot == PPPCCP)
+               else if (proto == PPPCCP)

                {
                        session[s].last_packet = time_now;
                        if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
                {
                        session[s].last_packet = time_now;
                        if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }

-                       processccp(t, s, p, l);
+                       processccp(s, t, p, l);
+               }
+               else if (proto == PPPIP)
+               {
+                       if (session[s].die)
+                       {
+                               LOG(4, s, t, "Session %d is closing.  Don't process PPP packets\n", s);
+                               return;              // closing session, PPP not processed
+                       }
+
+                       session[s].last_packet = time_now;
+                       if (session[s].walled_garden && !config->cluster_iam_master)
+                       {
+                               master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
+                               return;
+                       }
+
+                       processipin(s, t, p, l);

                }
                }

-               else if (prot == PPPIP)
+               else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])

                {
                {

+                       if (session[s].die)
+                       {
+                               LOG(4, s, t, "Session %d is closing.  Don't process PPP packets\n", s);
+                               return;              // closing session, PPP not processed
+                       }
+

                        session[s].last_packet = time_now;
                        if (session[s].walled_garden && !config->cluster_iam_master)
                        {
                                master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
                                return;
                        }
                        session[s].last_packet = time_now;
                        if (session[s].walled_garden && !config->cluster_iam_master)
                        {
                                master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
                                return;
                        }

-                       processipin(t, s, p, l);
+
+                       processipv6in(s, t, p, l);
+               }
+               else if (session[s].ppp.lcp == Opened)
+               {
+                       uint8_t buf[MAXETHER];
+                       uint8_t *q;
+                       int mru = session[s].mru;
+                       if (mru > sizeof(buf)) mru = sizeof(buf);
+
+                       l += 6;
+                       if (l > mru) l = mru;
+
+                       q = makeppp(buf, sizeof(buf), 0, 0, s, t, proto);
+                       if (!q) return;
+
+                       *q = CodeRej;
+                       *(q + 1) = ++sess_local[s].lcp_ident;
+                       *(uint16_t *)(q + 2) = l;
+                       *(uint16_t *)(q + 4) = htons(proto);
+                       memcpy(q + 6, p, l - 6);
+
+                       if (proto == PPPIPV6CP)
+                               LOG(3, s, t, "LCP: send ProtocolRej (IPV6CP: not configured)\n");
+                       else
+                               LOG(2, s, t, "LCP: sent ProtocolRej (0x%04X: unsupported)\n", proto);
+
+                       tunnelsend(buf, l + (q - buf), t);

                }
                else
                {
                }
                else
                {

-                       STAT(tunnel_rx_errors);
-                       LOG(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown PPP protocol %04X\n", prot);
+                       LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
+                               proto, ppp_state(session[s].ppp.lcp));

                }
        }
 }
 
 // read and process packet on tun
                }
        }
 }
 
 // read and process packet on tun

-static void processtun(u8 * buf, int len)
+static void processtun(uint8_t * buf, int len)

 {
        LOG_HEX(5, "Receive TUN Data", buf, len);
        STAT(tun_rx_packets);
        INC_STAT(tun_rx_bytes, len);
 
 {
        LOG_HEX(5, "Receive TUN Data", buf, len);
        STAT(tun_rx_packets);
        INC_STAT(tun_rx_bytes, len);
 

-       CSTAT(call_processtun);
+       CSTAT(processtun);

 
        eth_rx_pkt++;
        eth_rx += len;
        if (len < 22)
        {
 
        eth_rx_pkt++;
        eth_rx += len;
        if (len < 22)
        {

-               LOG(1, 0, 0, 0, "Short tun packet %d bytes\n", len);
+               LOG(1, 0, 0, "Short tun packet %d bytes\n", len);

                STAT(tun_rx_errors);
                return;
        }
 
                STAT(tun_rx_errors);
                return;
        }
 

-       if (*(u16 *) (buf + 2) == htons(PKTIP)) // IP
+       if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4

                processipout(buf, len);
                processipout(buf, len);

+       else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
+           && config->ipv6_prefix.s6_addr[0])
+               processipv6out(buf, len);
+

        // Else discard.
 }
 
        // Else discard.
 }
 

-//
-// Maximum number of actions to complete.
-// This is to avoid sending out too many packets
-// at once.
-#define MAX_ACTIONS 500
-
-static int regular_cleanups(void)
+// Handle retries, timeouts.  Runs every 1/10th sec, want to ensure
+// that we look at the whole of the tunnel, radius and session tables
+// every second
+static void regular_cleanups(double period)

 {
 {

-       static sessionidt s = 0;        // Next session to check for actions on.
-       tunnelidt t;
-       int count=0,i;
-       u16 r;
-       static clockt next_acct = 0;
+       // Next tunnel, radius and session to check for actions on.
+       static tunnelidt t = 0;
+       static int r = 0;
+       static sessionidt s = 0;
+
+       int t_actions = 0;
+       int r_actions = 0;
+       int s_actions = 0;
+
+       int t_slice;
+       int r_slice;
+       int s_slice;
+
+       int i;

        int a;
 
        int a;
 

-       LOG(3, 0, 0, 0, "Begin regular cleanup\n");
+       // divide up tables into slices based on the last run
+       t_slice = config->cluster_highest_tunnelid  * period;
+       r_slice = (MAXRADIUS - 1)                   * period;
+       s_slice = config->cluster_highest_sessionid * period;

 
 

-       for (r = 1; r < MAXRADIUS; r++)
-       {
-               if (!radius[r].state)
-                       continue;
-               if (radius[r].retry)
-               {
-                       if (radius[r].retry <= TIME)
-                               radiusretry(r);
-               } else
-                       radius[r].retry = backoff(radius[r].try+1);     // Is this really needed? --mo
-       }
-       for (t = 1; t <= config->cluster_highest_tunnelid; t++)
+       if (t_slice < 1)
+           t_slice = 1;
+       else if (t_slice > config->cluster_highest_tunnelid)
+           t_slice = config->cluster_highest_tunnelid;
+
+       if (r_slice < 1)
+           r_slice = 1;
+       else if (r_slice > (MAXRADIUS - 1))
+           r_slice = MAXRADIUS - 1;
+
+       if (s_slice < 1)
+           s_slice = 1;
+       else if (s_slice > config->cluster_highest_sessionid)
+           s_slice = config->cluster_highest_sessionid;
+
+       LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
+
+       for (i = 0; i < t_slice; i++)

        {
        {

+               t++;
+               if (t > config->cluster_highest_tunnelid)
+                       t = 1;
+

                // check for expired tunnels
                if (tunnel[t].die && tunnel[t].die <= TIME)
                {
                        STAT(tunnel_timeout);
                        tunnelkill(t, "Expired");
                // check for expired tunnels
                if (tunnel[t].die && tunnel[t].die <= TIME)
                {
                        STAT(tunnel_timeout);
                        tunnelkill(t, "Expired");

+                       t_actions++;

                        continue;
                }
                // check for message resend
                        continue;
                }
                // check for message resend


@@ -1994,7 +2712,7 @@ static int regular_cleanups(void)
                        if (tunnel[t].retry <= TIME)
                        {
                                controlt *c = tunnel[t].controls;
                        if (tunnel[t].retry <= TIME)
                        {
                                controlt *c = tunnel[t].controls;

-                               u8 w = tunnel[t].window;
+                               uint8_t w = tunnel[t].window;

                                tunnel[t].try++; // another try
                                if (tunnel[t].try > 5)
                                        tunnelkill(t, "Timeout on control message"); // game over
                                tunnel[t].try++; // another try
                                if (tunnel[t].try > 5)
                                        tunnelkill(t, "Timeout on control message"); // game over


@@ -2004,14 +2722,17 @@ static int regular_cleanups(void)
                                                tunnelsend(c->buf, c->length, t);
                                                c = c->next;
                                        }
                                                tunnelsend(c->buf, c->length, t);
                                                c = c->next;
                                        }

+
+                               t_actions++;

                        }
                }
                // Send hello
                        }
                }
                // Send hello

-               if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600)
+               if (tunnel[t].state == TUNNELOPEN && (time_now - tunnel[t].lastrec) > 60)

                {
                        controlt *c = controlnew(6); // sending HELLO
                {
                        controlt *c = controlnew(6); // sending HELLO

-                       controladd(c, t, 0); // send the message
-                       LOG(3, tunnel[t].ip, 0, t, "Sending HELLO message\n");
+                       controladd(c, 0, t); // send the message
+                       LOG(3, 0, t, "Sending HELLO message\n");
+                       t_actions++;

                }
 
                // Check for tunnel changes requested from the CLI
                }
 
                // Check for tunnel changes requested from the CLI


@@ -2020,137 +2741,296 @@ static int regular_cleanups(void)
                        cli_tunnel_actions[t].action = 0;
                        if (a & CLI_TUN_KILL)
                        {
                        cli_tunnel_actions[t].action = 0;
                        if (a & CLI_TUN_KILL)
                        {

-                               LOG(2, tunnel[t].ip, 0, t, "Dropping tunnel by CLI\n");
-                               tunnelshutdown(t, "Requested by administrator");
+                               LOG(2, 0, t, "Dropping tunnel by CLI\n");
+                               tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
+                               t_actions++;

                        }
                }
                        }
                }

+       }
+
+       for (i = 0; i < r_slice; i++)
+       {
+               r++;
+               if (r >= MAXRADIUS)
+                       r = 1;
+
+               if (!radius[r].state)
+                       continue;

 
 

+               if (radius[r].retry <= TIME)
+               {
+                       radiusretry(r);
+                       r_actions++;
+               }

        }
 
        }
 

-       count = 0;
-       for (i = 1; i <= config->cluster_highest_sessionid; i++)
+       for (i = 0; i < s_slice; i++)

        {
                s++;
                if (s > config->cluster_highest_sessionid)
                        s = 1;
 
        {
                s++;
                if (s > config->cluster_highest_sessionid)
                        s = 1;
 

-               if (!session[s].tunnel) // Session isn't in use
+               if (!session[s].opened) // Session isn't in use

                        continue;
 
                        continue;
 

-               if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED))
-               {
-                       // IPCP has not completed yet. Resend
-                       LOG(3, session[s].ip, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n");
-                       sendipcp(session[s].tunnel, s);
-               }
-

                // check for expired sessions
                // check for expired sessions

-               if (session[s].die && session[s].die <= TIME)
+               if (session[s].die)

                {
                {

-                       sessionkill(s, "Expired");
-                       if (++count >= MAX_ACTIONS) break;
+                       if (session[s].die <= TIME)
+                       {
+                               sessionkill(s, "Expired");
+                               s_actions++;
+                       }

                        continue;
                }
 
                        continue;
                }
 

-               // Drop sessions who have not responded within IDLE_TIMEOUT seconds
-               if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
+               // PPP timeouts
+               if (sess_local[s].lcp.restart <= time_now)

                {
                {

-                       sessionkill(s, "No response to LCP ECHO requests");
-                       STAT(session_timeout);
-                       if (++count >= MAX_ACTIONS) break;
-                       continue;
-               }
+                       int next_state = session[s].ppp.lcp;
+                       switch (session[s].ppp.lcp)
+                       {
+                       case RequestSent:
+                       case AckReceived:
+                               next_state = RequestSent;

 
 

-               // No data in IDLE_TIMEOUT seconds, send LCP ECHO
-               if (session[s].user[0] && (time_now - session[s].last_packet >= ECHO_TIMEOUT))
-               {
-                       u8 b[MAXCONTROL] = {0};
+                       case AckSent:
+                               if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
+                               {
+                                       LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
+                                       sess_local[s].lcp.restart = time_now + config->ppp_restart_time;
+                                       sess_local[s].lcp.conf_sent++;
+                                       sendlcp(s, session[s].tunnel);
+                                       change_state(s, lcp, next_state);
+                               }
+                               else
+                               {
+                                       sessionshutdown(s, "No response to LCP ConfigReq.", 3, 0);
+                                       STAT(session_timeout);
+                               }

 
 

-                       u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
-                       if (!q)
-                       {
-                               LOG(3, session[s].ip, s, t, "failed to send ECHO packet.\n");
-                               continue;
+                               s_actions++;

                        }
 
                        }
 

-                       *q = EchoReq;
-                       *(u8 *)(q + 1) = (time_now % 255); // ID
-                       *(u16 *)(q + 2) = htons(8); // Length
-                       *(u32 *)(q + 4) = 0; // Magic Number (not supported)
-
-                       LOG(4, session[s].ip, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
-                                       (int)(time_now - session[s].last_packet));
-                       tunnelsend(b, 24, session[s].tunnel); // send it
-                       if (++count >= MAX_ACTIONS) break;
+                       if (session[s].die)
+                               continue;

                }
 
                }
 

-               // Check for actions requested from the CLI
-               if ((a = cli_session_actions[s].action))
+               if (sess_local[s].ipcp.restart <= time_now)

                {
                {

-                       int send = 0;
-
-                       cli_session_actions[s].action = 0;
-                       if (a & CLI_SESS_KILL)
+                       int next_state = session[s].ppp.ipcp;
+                       switch (session[s].ppp.ipcp)

                        {
                        {

-                               LOG(2, 0, s, session[s].tunnel, "Dropping session by CLI\n");
-                               sessionshutdown(s, "Requested by administrator");
-                               a = 0; // dead, no need to check for other actions
+                       case RequestSent:
+                       case AckReceived:
+                               next_state = RequestSent;
+
+                       case AckSent:
+                               if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
+                               {
+                                       LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
+                                       sess_local[s].ipcp.restart = time_now + config->ppp_restart_time;
+                                       sess_local[s].ipcp.conf_sent++;
+                                       sendipcp(s, session[s].tunnel);
+                                       change_state(s, ipcp, next_state);
+                               }
+                               else
+                               {
+                                       sessionshutdown(s, "No response to IPCP ConfigReq.", 3, 0);
+                                       STAT(session_timeout);
+                               }
+
+                               s_actions++;
+                       }
+
+                       if (session[s].die)
+                               continue;
+               }
+
+               if (sess_local[s].ipv6cp.restart <= time_now)
+               {
+                       int next_state = session[s].ppp.ipv6cp;
+                       switch (session[s].ppp.ipv6cp)
+                       {
+                       case RequestSent:
+                       case AckReceived:
+                               next_state = RequestSent;
+
+                       case AckSent:
+                               if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
+                               {
+                                       LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
+                                       sess_local[s].ipv6cp.restart = time_now + config->ppp_restart_time;
+                                       sess_local[s].ipv6cp.conf_sent++;
+                                       sendipv6cp(s, session[s].tunnel);
+                                       change_state(s, ipv6cp, next_state);
+                               }
+                               else
+                               {
+                                       LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
+                                       change_state(s, ipv6cp, Stopped);
+                               }
+
+                               s_actions++;
+                       }
+               }
+
+               if (sess_local[s].ccp.restart <= time_now)
+               {
+                       int next_state = session[s].ppp.ccp;
+                       switch (session[s].ppp.ccp)
+                       {
+                       case RequestSent:
+                       case AckReceived:
+                               next_state = RequestSent;
+
+                       case AckSent:
+                               if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
+                               {
+                                       LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
+                                       sess_local[s].ccp.restart = time_now + config->ppp_restart_time;
+                                       sess_local[s].ccp.conf_sent++;
+                                       sendccp(s, session[s].tunnel);
+                                       change_state(s, ccp, next_state);
+                               }
+                               else
+                               {
+                                       LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
+                                       change_state(s, ccp, Stopped);
+                               }
+
+                               s_actions++;
+                       }
+               }
+
+               // Drop sessions who have not responded within IDLE_TIMEOUT seconds
+               if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
+               {
+                       sessionshutdown(s, "No response to LCP ECHO requests.", 3, 0);
+                       STAT(session_timeout);
+                       s_actions++;
+                       continue;
+               }
+
+               // No data in ECHO_TIMEOUT seconds, send LCP ECHO
+               if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT))
+               {
+                       uint8_t b[MAXETHER];
+
+                       uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP);
+                       if (!q) continue;
+
+                       *q = EchoReq;
+                       *(uint8_t *)(q + 1) = (time_now % 255); // ID
+                       *(uint16_t *)(q + 2) = htons(8); // Length
+                       *(uint32_t *)(q + 4) = 0; // Magic Number (not supported)
+
+                       LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
+                                       (int)(time_now - session[s].last_packet));
+                       tunnelsend(b, 24, session[s].tunnel); // send it
+                       s_actions++;
+               }
+
+               // Check for actions requested from the CLI
+               if ((a = cli_session_actions[s].action))
+               {
+                       int send = 0;
+
+                       cli_session_actions[s].action = 0;
+                       if (a & CLI_SESS_KILL)
+                       {
+                               LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
+                               sessionshutdown(s, "Requested by administrator.", 3, 0);
+                               a = 0; // dead, no need to check for other actions
+                               s_actions++;

                        }
 
                        if (a & CLI_SESS_NOSNOOP)
                        {
                        }
 
                        if (a & CLI_SESS_NOSNOOP)
                        {

-                               LOG(2, 0, s, session[s].tunnel, "Unsnooping session by CLI\n");
+                               LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");

                                session[s].snoop_ip = 0;
                                session[s].snoop_port = 0;
                                session[s].snoop_ip = 0;
                                session[s].snoop_port = 0;

+                               s_actions++;

                                send++;
                        }
                        else if (a & CLI_SESS_SNOOP)
                        {
                                send++;
                        }
                        else if (a & CLI_SESS_SNOOP)
                        {

-                               LOG(2, 0, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n",
-                                   inet_toa(cli_session_actions[s].snoop_ip), cli_session_actions[s].snoop_port);
+                               LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n",
+                                   fmtaddr(cli_session_actions[s].snoop_ip, 0),
+                                   cli_session_actions[s].snoop_port);

 
                                session[s].snoop_ip = cli_session_actions[s].snoop_ip;
                                session[s].snoop_port = cli_session_actions[s].snoop_port;
 
                                session[s].snoop_ip = cli_session_actions[s].snoop_ip;
                                session[s].snoop_port = cli_session_actions[s].snoop_port;

+                               s_actions++;

                                send++;
                        }
 
                        if (a & CLI_SESS_NOTHROTTLE)
                        {
                                send++;
                        }
 
                        if (a & CLI_SESS_NOTHROTTLE)
                        {

-                               LOG(2, 0, s, session[s].tunnel, "Un-throttling session by CLI\n");
+                               LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");

                                throttle_session(s, 0, 0);
                                throttle_session(s, 0, 0);

+                               s_actions++;

                                send++;
                        }
                        else if (a & CLI_SESS_THROTTLE)
                        {
                                send++;
                        }
                        else if (a & CLI_SESS_THROTTLE)
                        {

-                               LOG(2, 0, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
+                               LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",

                                    cli_session_actions[s].throttle_in,
                                    cli_session_actions[s].throttle_out);
 
                                throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
                                    cli_session_actions[s].throttle_in,
                                    cli_session_actions[s].throttle_out);
 
                                throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);

+                               s_actions++;
+                               send++;
+                       }
+
+                       if (a & CLI_SESS_NOFILTER)
+                       {
+                               LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
+                               filter_session(s, 0, 0);
+                               s_actions++;
+                               send++;
+                       }
+                       else if (a & CLI_SESS_FILTER)
+                       {
+                               LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
+                                   cli_session_actions[s].filter_in,
+                                   cli_session_actions[s].filter_out);
+
+                               filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
+                               s_actions++;

                                send++;
                        }
 
                        if (send)
                                cluster_send_session(s);
                                send++;
                        }
 
                        if (send)
                                cluster_send_session(s);

-
-                       if (++count >= MAX_ACTIONS) break;

                }
                }

-       }

 
 

-       if (*config->accounting_dir && next_acct <= TIME)
-       {
-               // Dump accounting data
-               next_acct = TIME + ACCT_TIME;
-               dump_acct_info();
-       }
+               // RADIUS interim accounting
+               if (config->radius_accounting && config->radius_interim > 0
+                   && session[s].ip && !session[s].walled_garden
+                   && !sess_local[s].radius // RADIUS already in progress
+                   && time_now - sess_local[s].last_interim >= config->radius_interim)
+               {
+                       int rad = radiusnew(s);
+                       if (!rad)
+                       {
+                               LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
+                               STAT(radius_overflow);
+                               continue;
+                       }

 
 

-       if (count >= MAX_ACTIONS)
-               return 1;       // Didn't finish!
+                       LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
+                               session[s].user, session[s].unique_id);

 
 

-       LOG(3, 0, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count, config->cleanup_interval);
-       return 0;
-}
+                       radiussend(rad, RADIUSINTERIM);
+                       sess_local[s].last_interim = time_now;
+                       s_actions++;
+               }
+       }

 
 

+       LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
+               t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
+}

 
 //
 // Are we in the middle of a tunnel update, or radius
 
 //
 // Are we in the middle of a tunnel update, or radius


@@ -2161,6 +3041,53 @@ static int still_busy(void)
        int i;
        static clockt last_talked = 0;
        static clockt start_busy_wait = 0;
        int i;
        static clockt last_talked = 0;
        static clockt start_busy_wait = 0;

+
+       if (!config->cluster_iam_master)
+       {
+#ifdef BGP
+               static time_t stopped_bgp = 0;
+               if (bgp_configured)
+               {
+                       if (!stopped_bgp)
+                       {
+                               LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
+
+                               for (i = 0; i < BGP_NUM_PEERS; i++)
+                                       if (bgp_peers[i].state == Established)
+                                               bgp_stop(&bgp_peers[i]);
+
+                               stopped_bgp = time_now;
+
+                               // we don't want to become master
+                               cluster_send_ping(0);
+
+                               return 1;
+                       }
+
+                       if (time_now < (stopped_bgp + QUIT_DELAY))
+                               return 1;
+               }
+#endif /* BGP */
+
+               return 0;
+       }
+
+       if (main_quit == QUIT_SHUTDOWN)
+       {
+               static int dropped = 0;
+               if (!dropped)
+               {
+                       int i;
+
+                       LOG(1, 0, 0, "Dropping sessions and tunnels\n");
+                       for (i = 1; i < MAXTUNNEL; i++)
+                               if (tunnel[i].ip || tunnel[i].state)
+                                       tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
+
+                       dropped = 1;
+               }
+       }
+

        if (start_busy_wait == 0)
                start_busy_wait = TIME;
 
        if (start_busy_wait == 0)
                start_busy_wait = TIME;
 


@@ -2171,7 +3098,7 @@ static int still_busy(void)
 
                if (last_talked != TIME)
                {
 
                if (last_talked != TIME)
                {

-                       LOG(2,0,0,0, "Tunnel %d still has un-acked control messages.\n", i);
+                       LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i);

                        last_talked = TIME;
                }
                return 1;
                        last_talked = TIME;
                }
                return 1;


@@ -2180,7 +3107,7 @@ static int still_busy(void)
        // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
        if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
        {
        // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
        if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
        {

-               LOG(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
+               LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty.  Shutting down anyway.\n");

                return 0;
        }
 
                return 0;
        }
 


@@ -2193,7 +3120,7 @@ static int still_busy(void)
 
                if (last_talked != TIME)
                {
 
                if (last_talked != TIME)
                {

-                       LOG(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session);
+                       LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session);

                        last_talked = TIME;
                }
                return 1;
                        last_talked = TIME;
                }
                return 1;


@@ -2202,151 +3129,262 @@ static int still_busy(void)
        return 0;
 }
 
        return 0;
 }
 

-static fd_set readset;
-static int readset_n = 0;
+#ifdef HAVE_EPOLL
+# include <sys/epoll.h>
+#else
+# define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
+# include "fake_epoll.h"
+#endif
+
+// the base set of fds polled: cli, cluster, tun, udp, control, dae
+#define BASE_FDS       6
+
+// additional polled fds
+#ifdef BGP
+# define EXTRA_FDS     BGP_NUM_PEERS
+#else
+# define EXTRA_FDS     0
+#endif

 
 // main loop - gets packets on tun or udp and processes them
 static void mainloop(void)
 {
        int i;
 
 // main loop - gets packets on tun or udp and processes them
 static void mainloop(void)
 {
        int i;

-       u8 buf[65536];
-       struct timeval to;
+       uint8_t buf[65536];

        clockt next_cluster_ping = 0;   // send initial ping immediately
        clockt next_cluster_ping = 0;   // send initial ping immediately

-       time_t next_clean = time_now + config->cleanup_interval;
-
-       LOG(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n",
-                       udpfd, tunfd, cluster_sockfd, controlfd);
-
-       FD_ZERO(&readset);
-       FD_SET(udpfd, &readset);
-       FD_SET(tunfd, &readset);
-       FD_SET(controlfd, &readset);
-       FD_SET(clifd, &readset);
-       if (cluster_sockfd) FD_SET(cluster_sockfd, &readset);
-       readset_n = udpfd;
-       if (tunfd > readset_n)          readset_n = tunfd;
-       if (controlfd > readset_n)      readset_n = controlfd;
-       if (clifd > readset_n)          readset_n = clifd;
-       if (cluster_sockfd > readset_n) readset_n = cluster_sockfd;
+       struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
+       int maxevent = sizeof(events)/sizeof(*events);

 
 

-       while (!main_quit || still_busy())
+       if ((epollfd = epoll_create(maxevent)) < 0)
+       {
+               LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
+               exit(1);
+       }
+
+       LOG(4, 0, 0, "Beginning of main loop.  clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
+               clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd);
+
+       /* setup our fds to poll for input */

        {
        {

-               fd_set r;
-               int n = readset_n;
+               static struct event_data d[BASE_FDS];
+               struct epoll_event e;
+
+               e.events = EPOLLIN;
+               i = 0;
+
+               d[i].type = FD_TYPE_CLI;
+               e.data.ptr = &d[i++];
+               epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
+
+               d[i].type = FD_TYPE_CLUSTER;
+               e.data.ptr = &d[i++];
+               epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
+
+               d[i].type = FD_TYPE_TUN;
+               e.data.ptr = &d[i++];
+               epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
+
+               d[i].type = FD_TYPE_UDP;
+               e.data.ptr = &d[i++];
+               epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
+
+               d[i].type = FD_TYPE_CONTROL;
+               e.data.ptr = &d[i++];
+               epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
+
+               d[i].type = FD_TYPE_DAE;
+               e.data.ptr = &d[i++];
+               epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
+       }
+

 #ifdef BGP
 #ifdef BGP

-               fd_set w;
-               int bgp_set[BGP_NUM_PEERS];
+       signal(SIGPIPE, SIG_IGN);
+       bgp_setup(config->as_number);
+       if (config->bind_address)
+               bgp_add_route(config->bind_address, 0xffffffff);
+
+       for (i = 0; i < BGP_NUM_PEERS; i++)
+       {
+               if (config->neighbour[i].name[0])
+                       bgp_start(&bgp_peers[i], config->neighbour[i].name,
+                               config->neighbour[i].as, config->neighbour[i].keepalive,
+                               config->neighbour[i].hold, 0); /* 0 = routing disabled */
+       }

 #endif /* BGP */
 
 #endif /* BGP */
 

+       while (!main_quit || still_busy())
+       {
+               int more = 0;
+               int n;
+

                if (config->reload_config)
                {
                        // Update the config state based on config settings
                        update_config();
                }
 
                if (config->reload_config)
                {
                        // Update the config state based on config settings
                        update_config();
                }
 

-               memcpy(&r, &readset, sizeof(fd_set));
-               to.tv_sec = 0;
-               to.tv_usec = 100000; // 1/10th of a second.
-

 #ifdef BGP
 #ifdef BGP

-               FD_ZERO(&w);
-               for (i = 0; i < BGP_NUM_PEERS; i++)
-               {
-                       bgp_set[i] = bgp_select_state(&bgp_peers[i]);
-                       if (bgp_set[i] & 1)
-                       {
-                               FD_SET(bgp_peers[i].sock, &r);
-                               if (bgp_peers[i].sock > n)
-                                       n = bgp_peers[i].sock;
-                       }
-
-                       if (bgp_set[i] & 2)
-                       {
-                               FD_SET(bgp_peers[i].sock, &w);
-                               if (bgp_peers[i].sock > n)
-                                       n = bgp_peers[i].sock;
-                       }
-               }
-
-               n = select(n + 1, &r, &w, 0, &to);
-#else /* BGP */
-               n = select(n + 1, &r, 0, 0, &to);
+               bgp_set_poll();

 #endif /* BGP */
 
 #endif /* BGP */
 

-               TIME = now();
+               n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
+               STAT(select_called);
+
+               TIME = now(NULL);

                if (n < 0)
                {
                        if (errno == EINTR ||
                            errno == ECHILD) // EINTR was clobbered by sigchild_handler()
                                continue;
 
                if (n < 0)
                {
                        if (errno == EINTR ||
                            errno == ECHILD) // EINTR was clobbered by sigchild_handler()
                                continue;
 

-                       LOG(0, 0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
-                       main_quit++;
-                       break;
+                       LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
+                       break; // exit

                }
                }

-               else if (n)
+
+               if (n)

                {
                        struct sockaddr_in addr;
                {
                        struct sockaddr_in addr;

-                       int alen = sizeof(addr);
-                       if (FD_ISSET(udpfd, &r))
+                       socklen_t alen;
+                       int c, s;
+                       int udp_ready = 0;
+                       int tun_ready = 0;
+                       int cluster_ready = 0;
+                       int udp_pkts = 0;
+                       int tun_pkts = 0;
+                       int cluster_pkts = 0;
+#ifdef BGP
+                       uint32_t bgp_events[BGP_NUM_PEERS];
+                       memset(bgp_events, 0, sizeof(bgp_events));
+#endif /* BGP */
+
+                       for (c = n, i = 0; i < c; i++)

                        {
                        {

-                               int c, n;
-                               for (c = 0; c < config->multi_read_count; c++)
+                               struct event_data *d = events[i].data.ptr;
+                               switch (d->type)

                                {
                                {

-                                       if ((n = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
-                                               processudp(buf, n, &addr);
-                                       else
-                                               break;
-                               }
-                       }
-                       if (FD_ISSET(tunfd, &r))
-                       {
-                               int c, n;
-                               for (c = 0; c < config->multi_read_count; c++)
+                               case FD_TYPE_CLI: // CLI connections

                                {
                                {

-                                       if ((n = read(tunfd, buf, sizeof(buf))) > 0)
-                                               processtun(buf, n);
+                                       int cli;
+                                       
+                                       alen = sizeof(addr);
+                                       if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
+                                       {
+                                               cli_do(cli);
+                                               close(cli);
+                                       }

                                        else
                                        else

-                                               break;
+                                               LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
+
+                                       n--;
+                                       break;

                                }
                                }

-                       }

 
 

-                       if (config->cluster_iam_master)
-                               for (i = 0; i < config->num_radfds; i++)
-                                       if (FD_ISSET(radfds[i], &r))
-                                               processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i);
+                               // these are handled below, with multiple interleaved reads
+                               case FD_TYPE_CLUSTER:   cluster_ready++; break;
+                               case FD_TYPE_TUN:       tun_ready++; break;
+                               case FD_TYPE_UDP:       udp_ready++; break;

 
 

-                       if (FD_ISSET(cluster_sockfd, &r))
-                       {
-                               int size;
-                               size = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen);
-                               processcluster(buf, size, addr.sin_addr.s_addr);
+                               case FD_TYPE_CONTROL: // nsctl commands
+                                       alen = sizeof(addr);
+                                       processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
+                                       n--;
+                                       break;
+
+                               case FD_TYPE_DAE: // DAE requests
+                                       alen = sizeof(addr);
+                                       processdae(buf, recvfrom(daefd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
+                                       n--;
+                                       break;
+
+                               case FD_TYPE_RADIUS: // RADIUS response
+                                       s = recv(radfds[d->index], buf, sizeof(buf), 0);
+                                       if (s >= 0 && config->cluster_iam_master)
+                                               processrad(buf, s, d->index);
+
+                                       n--;
+                                       break;
+
+#ifdef BGP
+                               case FD_TYPE_BGP:
+                                       bgp_events[d->index] = events[i].events;
+                                       n--;
+                                       break;
+#endif /* BGP */
+
+                               default:
+                                       LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
+                               }

                        }
 
                        }
 

-                       if (FD_ISSET(controlfd, &r))
-                               processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
+#ifdef BGP
+                       bgp_process(bgp_events);
+#endif /* BGP */

 
 

-                       if (FD_ISSET(clifd, &r))
+                       for (c = 0; n && c < config->multi_read_count; c++)

                        {
                        {

-                               struct sockaddr_in addr;
-                               int sockfd;
-                               int len = sizeof(addr);
+                               // L2TP
+                               if (udp_ready)
+                               {
+                                       alen = sizeof(addr);
+                                       if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
+                                       {
+                                               processudp(buf, s, &addr);
+                                               udp_pkts++;
+                                       }
+                                       else
+                                       {
+                                               udp_ready = 0;
+                                               n--;
+                                       }
+                               }

 
 

-                               if ((sockfd = accept(clifd, (struct sockaddr *)&addr, &len)) <= 0)
+                               // incoming IP
+                               if (tun_ready)

                                {
                                {

-                                       LOG(0, 0, 0, 0, "accept error: %s\n", strerror(errno));
-                                       continue;
+                                       if ((s = read(tunfd, buf, sizeof(buf))) > 0)
+                                       {
+                                               processtun(buf, s);
+                                               tun_pkts++;
+                                       }
+                                       else
+                                       {
+                                               tun_ready = 0;
+                                               n--;
+                                       }

                                }
                                }

-                               else
+
+                               // cluster
+                               if (cluster_ready)

                                {
                                {

-                                       cli_do(sockfd);
-                                       close(sockfd);
+                                       alen = sizeof(addr);
+                                       if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
+                                       {
+                                               processcluster(buf, s, addr.sin_addr.s_addr);
+                                               cluster_pkts++;
+                                       }
+                                       else
+                                       {
+                                               cluster_ready = 0;
+                                               n--;
+                                       }

                                }
                        }
                                }
                        }

+
+                       if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
+                               STAT(multi_read_used);
+
+                       if (c >= config->multi_read_count)
+                       {
+                               LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
+                                       config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
+
+                               STAT(multi_read_exceeded);
+                               more++;
+                       }

                }
 
                        // Runs on every machine (master and slaves).
                }
 
                        // Runs on every machine (master and slaves).

-               if (cluster_sockfd && next_cluster_ping <= TIME)
+               if (next_cluster_ping <= TIME)

                {
                        // Check to see which of the cluster is still alive..
 
                {
                        // Check to see which of the cluster is still alive..
 


@@ -2364,9 +3402,11 @@ static void mainloop(void)
                                next_cluster_ping = TIME + config->cluster_hb_interval;
                }
 
                                next_cluster_ping = TIME + config->cluster_hb_interval;
                }
 

+               if (!config->cluster_iam_master)
+                       continue;
+

                        // Run token bucket filtering queue..
                        // Only run it every 1/10th of a second.
                        // Run token bucket filtering queue..
                        // Only run it every 1/10th of a second.

-                       // Runs on all machines both master and slave.

                {
                        static clockt last_run = 0;
                        if (last_run != TIME)
                {
                        static clockt last_run = 0;
                        if (last_run != TIME)


@@ -2376,31 +3416,44 @@ static void mainloop(void)
                        }
                }
 
                        }
                }
 

-               /* Handle timeouts. Make sure that this gets run anyway, even if there was
-                * something to read, else under load this will never actually run....
-                *
-                */
-               if (config->cluster_iam_master && next_clean <= time_now)
+                       // Handle timeouts, retries etc.

                {
                {

-                       if (regular_cleanups())
-                       {
-                               // Did it finish?
-                               next_clean = time_now + 1 ;     // Didn't finish. Check quickly.
-                       }
-                       else
+                       static double last_clean = 0;
+                       double this_clean;
+                       double diff;
+
+                       TIME = now(&this_clean);
+                       diff = this_clean - last_clean;
+
+                       // Run during idle time (after we've handled
+                       // all incoming packets) or every 1/10th sec
+                       if (!more || diff > 0.1)

                        {
                        {

-                               next_clean = time_now + config->cleanup_interval; // Did. Move to next interval.
+                               regular_cleanups(diff);
+                               last_clean = this_clean;

                        }
                }
 
                        }
                }
 

-#ifdef BGP
-               for (i = 0; i < BGP_NUM_PEERS; i++)
+               if (*config->accounting_dir)

                {
                {

-                       bgp_process(&bgp_peers[i],
-                               bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &r) : 0,
-                               bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &w) : 0);
+                       static clockt next_acct = 0;
+                       static clockt next_shut_acct = 0;
+
+                       if (next_acct <= TIME)
+                       {
+                               // Dump accounting data
+                               next_acct = TIME + ACCT_TIME;
+                               next_shut_acct = TIME + ACCT_SHUT_TIME;
+                               dump_acct_info(1);
+                       }
+                       else if (next_shut_acct <= TIME)
+                       {
+                               // Dump accounting data for shutdown sessions
+                               next_shut_acct = TIME + ACCT_SHUT_TIME;
+                               if (shut_acct_n)
+                                       dump_acct_info(0);
+                       }

                }
                }

-#endif /* BGP */

        }
 
                // Are we the master and shutting down??
        }
 
                // Are we the master and shutting down??


@@ -2413,6 +3466,7 @@ static void mainloop(void)
 
        //
        // Important!!! We MUST not process any packets past this point!
 
        //
        // Important!!! We MUST not process any packets past this point!

+       LOG(1, 0, 0, "Shutdown complete\n");

 }
 
 static void stripdomain(char *host)
 }
 
 static void stripdomain(char *host)


@@ -2485,71 +3539,87 @@ static void initdata(int optdebug, char *optconfig)
 {
        int i;
 
 {
        int i;
 

-       if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
+       if (!(config = shared_malloc(sizeof(configt))))

        {
        {

-               LOG(0, 0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
+               fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));

                exit(1);
        }
                exit(1);
        }

-       if (!(config = shared_malloc(sizeof(struct configt))))
-       {
-               LOG(0, 0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno));
-               exit(1);
-       }
-       memset(config, 0, sizeof(struct configt));
+
+       memset(config, 0, sizeof(configt));

        time(&config->start_time);
        strncpy(config->config_file, optconfig, strlen(optconfig));
        config->debug = optdebug;
        config->num_tbfs = MAXTBFS;
        config->rl_rate = 28; // 28kbps
        time(&config->start_time);
        strncpy(config->config_file, optconfig, strlen(optconfig));
        config->debug = optdebug;
        config->num_tbfs = MAXTBFS;
        config->rl_rate = 28; // 28kbps

+       config->cluster_mcast_ttl = 1;
+       config->cluster_master_min_adv = 1;
+       config->ppp_restart_time = 3;
+       config->ppp_max_configure = 10;
+       config->ppp_max_failure = 5;
+       strcpy(config->random_device, RANDOMDEVICE);

 
 

+       log_stream = stderr;
+
+#ifdef RINGBUFFER
+       if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
+       {
+               LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
+               exit(1);
+       }
+       memset(ringbuffer, 0, sizeof(struct Tringbuffer));
+#endif
+
+       if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
+       {
+               LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
+               exit(1);
+       }

        if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
        {
        if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
        {

-               LOG(0, 0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));

                exit(1);
        }
        if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
        {
                exit(1);
        }
        if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
        {

-               LOG(0, 0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));

                exit(1);
        }
 
                exit(1);
        }
 

-       if (!(sess_count = shared_malloc(sizeof(sessioncountt) * MAXSESSION)))
+       if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))

        {
        {

-               LOG(0, 0, 0, 0, "Error doing malloc for sessions_count: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));

                exit(1);
        }
 
        if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
        {
                exit(1);
        }
 
        if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
        {

-               LOG(0, 0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));

                exit(1);
        }
 
        if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
        {
                exit(1);
        }
 
        if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
        {

-               LOG(0, 0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));

                exit(1);
        }
 
                exit(1);
        }
 

-#ifdef RINGBUFFER
-       if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
+       if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))

        {
        {

-               LOG(0, 0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));

                exit(1);
        }
                exit(1);
        }

-       memset(ringbuffer, 0, sizeof(struct Tringbuffer));
-#endif
+       memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);

 
        if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
        {
 
        if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
        {

-               LOG(0, 0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));

                exit(1);
        }
        memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
 
        if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
        {
                exit(1);
        }
        memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
 
        if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
        {

-               LOG(0, 0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));

                exit(1);
        }
        memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
                exit(1);
        }
        memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);


@@ -2560,7 +3630,7 @@ static void initdata(int optdebug, char *optconfig)
        memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
 
                // Put all the sessions on the free list marked as undefined.
        memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
 
                // Put all the sessions on the free list marked as undefined.

-       for (i = 1; i < MAXSESSION - 1; i++)
+       for (i = 1; i < MAXSESSION; i++)

        {
                session[i].next = i + 1;
                session[i].tunnel = T_UNDEF;    // mark it as not filled in.
        {
                session[i].next = i + 1;
                session[i].tunnel = T_UNDEF;    // mark it as not filled in.


@@ -2569,7 +3639,7 @@ static void initdata(int optdebug, char *optconfig)
        sessionfree = 1;
 
                // Mark all the tunnels as undefined (waiting to be filled in by a download).
        sessionfree = 1;
 
                // Mark all the tunnels as undefined (waiting to be filled in by a download).

-       for (i = 1; i < MAXTUNNEL- 1; i++)
+       for (i = 1; i < MAXTUNNEL; i++)

                tunnel[i].state = TUNNELUNDEF;  // mark it as not filled in.
 
        if (!*hostname)
                tunnel[i].state = TUNNELUNDEF;  // mark it as not filled in.
 
        if (!*hostname)


@@ -2582,24 +3652,24 @@ static void initdata(int optdebug, char *optconfig)
        _statistics->start_time = _statistics->last_reset = time(NULL);
 
 #ifdef BGP
        _statistics->start_time = _statistics->last_reset = time(NULL);
 
 #ifdef BGP

-       if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
-       {
-               LOG(0, 0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
-               exit(1);
-       }
+       if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
+       {
+               LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
+               exit(1);
+       }

 #endif /* BGP */
 }
 
 static int assign_ip_address(sessionidt s)
 {
 #endif /* BGP */
 }
 
 static int assign_ip_address(sessionidt s)
 {

-       u32 i;
+       uint32_t i;

        int best = -1;
        time_t best_time = time_now;
        char *u = session[s].user;
        char reuse = 0;
 
 
        int best = -1;
        time_t best_time = time_now;
        char *u = session[s].user;
        char reuse = 0;
 
 

-       CSTAT(call_assign_ip_address);
+       CSTAT(assign_ip_address);

 
        for (i = 1; i < ip_pool_size; i++)
        {
 
        for (i = 1; i < ip_pool_size; i++)
        {


@@ -2623,7 +3693,7 @@ static int assign_ip_address(sessionidt s)
 
        if (best < 0)
        {
 
        if (best < 0)
        {

-               LOG(0, 0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
+               LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");

                return 0;
        }
 
                return 0;
        }
 


@@ -2641,8 +3711,8 @@ static int assign_ip_address(sessionidt s)
                strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
 
        STAT(ip_allocated);
                strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
 
        STAT(ip_allocated);

-       LOG(4, ip_address_pool[best].address, s, session[s].tunnel,
-               "assign_ip_address(): %s ip address %d from pool\n", reuse ? "Reusing" : "Allocating", best);
+       LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
+               reuse ? "Reusing" : "Allocating", best);

 
        return 1;
 }
 
        return 1;
 }


@@ -2652,7 +3722,7 @@ static void free_ip_address(sessionidt s)
        int i = session[s].ip_pool_index;
 
 
        int i = session[s].ip_pool_index;
 
 

-       CSTAT(call_free_ip_address);
+       CSTAT(free_ip_address);

 
        if (!session[s].ip)
                return; // what the?
 
        if (!session[s].ip)
                return; // what the?


@@ -2695,8 +3765,9 @@ void rebuild_address_pool(void)
        for (i = 0; i < MAXSESSION; ++i)
        {
                int ipid;
        for (i = 0; i < MAXSESSION; ++i)
        {
                int ipid;

-               if (!session[i].ip || !session[i].tunnel)
+               if (!(session[i].opened && session[i].ip))

                        continue;
                        continue;

+

                ipid = - lookup_ipmap(htonl(session[i].ip));
 
                if (session[i].ip_pool_index < 0)
                ipid = - lookup_ipmap(htonl(session[i].ip));
 
                if (session[i].ip_pool_index < 0)


@@ -2705,8 +3776,8 @@ void rebuild_address_pool(void)
                        if (ipid < 1)                   // Not found in the pool either? good.
                                continue;
 
                        if (ipid < 1)                   // Not found in the pool either? good.
                                continue;
 

-                       LOG(0, 0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
-                               i, inet_toa(session[i].ip), ipid);
+                       LOG(0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
+                               i, fmtaddr(session[i].ip, 0), ipid);

 
                        // Fall through and process it as part of the pool.
                }
 
                        // Fall through and process it as part of the pool.
                }


@@ -2714,7 +3785,7 @@ void rebuild_address_pool(void)
 
                if (ipid > MAXIPPOOL || ipid < 0)
                {
 
                if (ipid > MAXIPPOOL || ipid < 0)
                {

-                       LOG(0, 0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid);
+                       LOG(0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid);

                        ipid = -1;
                        session[i].ip_pool_index = ipid;
                        continue;
                        ipid = -1;
                        session[i].ip_pool_index = ipid;
                        continue;


@@ -2753,7 +3824,7 @@ static void fix_address_pool(int sid)
 //
 // Add a block of addresses to the IP pool to hand out.
 //
 //
 // Add a block of addresses to the IP pool to hand out.
 //

-static void add_to_ip_pool(u32 addr, u32 mask)
+static void add_to_ip_pool(in_addr_t addr, in_addr_t mask)

 {
        int i;
        if (mask == 0)
 {
        int i;
        if (mask == 0)


@@ -2774,7 +3845,7 @@ static void add_to_ip_pool(u32 addr, u32 mask)
                ++ip_pool_size;
                if (ip_pool_size >= MAXIPPOOL)
                {
                ++ip_pool_size;
                if (ip_pool_size >= MAXIPPOOL)
                {

-                       LOG(0,0,0,0, "Overflowed IP pool adding %s\n", inet_toa(htonl(addr)) );
+                       LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));

                        return;
                }
        }
                        return;
                }
        }


@@ -2790,7 +3861,7 @@ static void initippool()
 
        if (!(f = fopen(IPPOOLFILE, "r")))
        {
 
        if (!(f = fopen(IPPOOLFILE, "r")))
        {

-               LOG(0, 0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
+               LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));

                exit(1);
        }
 
                exit(1);
        }
 


@@ -2804,12 +3875,12 @@ static void initippool()
                if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
                if ((p = (char *)strchr(buf, ':')))
                {
                if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
                if ((p = (char *)strchr(buf, ':')))
                {

-                       ipt src;
+                       in_addr_t src;

                        *p = '\0';
                        src = inet_addr(buf);
                        if (src == INADDR_NONE)
                        {
                        *p = '\0';
                        src = inet_addr(buf);
                        if (src == INADDR_NONE)
                        {

-                               LOG(0, 0, 0, 0, "Invalid address pool IP %s\n", buf);
+                               LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);

                                exit(1);
                        }
                        // This entry is for a specific IP only
                                exit(1);
                        }
                        // This entry is for a specific IP only


@@ -2822,20 +3893,22 @@ static void initippool()
                {
                        // It's a range
                        int numbits = 0;
                {
                        // It's a range
                        int numbits = 0;

-                       u32 start = 0, mask = 0;
+                       in_addr_t start = 0, mask = 0;

 
 

-                       LOG(2, 0, 0, 0, "Adding IP address range %s\n", buf);
+                       LOG(2, 0, 0, "Adding IP address range %s\n", buf);

                        *p++ = 0;
                        if (!*p || !(numbits = atoi(p)))
                        {
                        *p++ = 0;
                        if (!*p || !(numbits = atoi(p)))
                        {

-                               LOG(0, 0, 0, 0, "Invalid pool range %s\n", buf);
+                               LOG(0, 0, 0, "Invalid pool range %s\n", buf);

                                continue;
                        }
                        start = ntohl(inet_addr(pool));
                                continue;
                        }
                        start = ntohl(inet_addr(pool));

-                       mask = (u32)(pow(2, numbits) - 1) << (32 - numbits);
+                       mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits);

 
                        // Add a static route for this pool
 
                        // Add a static route for this pool

-                       LOG(5, 0, 0, 0, "Adding route for address pool %s/%u\n", inet_toa(htonl(start)), 32 + mask);
+                       LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
+                               fmtaddr(htonl(start), 0), 32 + mask);
+

                        routeset(0, start, mask, 0, 1);
 
                        add_to_ip_pool(start, mask);
                        routeset(0, start, mask, 0, 1);
 
                        add_to_ip_pool(start, mask);


@@ -2847,10 +3920,10 @@ static void initippool()
                }
        }
        fclose(f);
                }
        }
        fclose(f);

-       LOG(1, 0, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
+       LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);

 }
 
 }
 

-void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port)
+void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)

 {
        struct sockaddr_in snoop_addr = {0};
        if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
 {
        struct sockaddr_in snoop_addr = {0};
        if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)


@@ -2860,62 +3933,82 @@ void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port)
        snoop_addr.sin_addr.s_addr = destination;
        snoop_addr.sin_port = ntohs(port);
 
        snoop_addr.sin_addr.s_addr = destination;
        snoop_addr.sin_port = ntohs(port);
 

-       LOG(5, 0, 0, 0, "Snooping packet at %p (%d bytes) to %s:%d\n",
-                       packet, size, inet_toa(snoop_addr.sin_addr.s_addr), htons(snoop_addr.sin_port));
+       LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size,
+               fmtaddr(snoop_addr.sin_addr.s_addr, 0),
+               htons(snoop_addr.sin_port));
+

        if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
        if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)

-               LOG(0, 0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
+               LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
+

        STAT(packets_snooped);
 }
 
        STAT(packets_snooped);
 }
 

-static void dump_acct_info()
+static int dump_session(FILE **f, sessiont *s)

 {
 {

-       char filename[1024];
-       char timestr[64];
-       time_t t = time(NULL);
-       int i;
-       FILE *f = NULL;
-
+       if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
+               return 1;

 
 

-       CSTAT(call_dump_acct_info);
+       if (!*f)
+       {
+               char filename[1024];
+               char timestr[64];
+               time_t now = time(NULL);

 
 

-       strftime(timestr, 64, "%Y%m%d%H%M%S", localtime(&t));
-       snprintf(filename, 1024, "%s/%s", config->accounting_dir, timestr);
+               strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
+               snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);

 
 

-       for (i = 0; i < MAXSESSION; i++)
-       {
-               if (!session[i].opened || !session[i].ip || !(session[i].cin || session[i].cout) || !*session[i].user || session[i].walled_garden)
-                       continue;
-               if (!f)
+               if (!(*f = fopen(filename, "w")))

                {
                {

-                       time_t now = time(NULL);
-                       if (!(f = fopen(filename, "w")))
-                       {
-                               LOG(0, 0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
-                               return ;
-                       }
-                       LOG(3, 0, 0, 0, "Dumping accounting information to %s\n", filename);
-                       fprintf(f, "# dslwatch.pl dump file V1.01\n"
-                               "# host: %s\n"
-                               "# time: %ld\n"
-                               "# uptime: %ld\n"
-                               "# format: username ip qos uptxoctets downrxoctets\n",
-                               hostname,
-                               now,
-                               now - basetime);
+                       LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
+                       return 0;

                }
 
                }
 

-               LOG(4, 0, 0, 0, "Dumping accounting information for %s\n", session[i].user);
-               fprintf(f, "%s %s %d %u %u\n",
-                       session[i].user,                                                // username
-                       inet_toa(htonl(session[i].ip)),                                 // ip
-                       (session[i].throttle_in || session[i].throttle_out) ? 2 : 1,    // qos
-                       (u32)session[i].cin,                                            // uptxoctets
-                       (u32)session[i].cout);                                          // downrxoctets
+               LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
+               fprintf(*f, "# dslwatch.pl dump file V1.01\n"
+                       "# host: %s\n"
+                       "# endpoint: %s\n"
+                       "# time: %ld\n"
+                       "# uptime: %ld\n"
+                       "# format: username ip qos uptxoctets downrxoctets\n",
+                       hostname,
+                       fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
+                       now,
+                       now - basetime);
+       }
+
+       LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
+       fprintf(*f, "%s %s %d %u %u\n",
+               s->user,                                                // username
+               fmtaddr(htonl(s->ip), 0),                               // ip
+               (s->throttle_in || s->throttle_out) ? 2 : 1,            // qos
+               (uint32_t) s->cin_delta,                                // uptxoctets
+               (uint32_t) s->cout_delta);                              // downrxoctets
+
+       s->cin_delta = s->cout_delta = 0;
+
+       return 1;
+}
+
+static void dump_acct_info(int all)
+{
+       int i;
+       FILE *f = NULL;
+
+
+       CSTAT(dump_acct_info);
+
+       if (shut_acct_n)
+       {
+               for (i = 0; i < shut_acct_n; i++)
+                       dump_session(&f, &shut_acct[i]);

 
 

-               session[i].pin = session[i].cin = 0;
-               session[i].pout = session[i].cout = 0;
+               shut_acct_n = 0;

        }
 
        }
 

+       if (all)
+               for (i = 1; i <= config->cluster_highest_sessionid; i++)
+                       dump_session(&f, &session[i]);
+

        if (f)
                fclose(f);
 }
        if (f)
                fclose(f);
 }


@@ -2975,16 +4068,17 @@ int main(int argc, char *argv[])
        read_config_file();
        init_tbf(config->num_tbfs);
 
        read_config_file();
        init_tbf(config->num_tbfs);
 

-       LOG(0, 0, 0, 0, "L2TPNS version " VERSION "\n");
-       LOG(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n");
-       LOG(0, 0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
+       LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
+       LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
+       LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");

        {
                struct rlimit rlim;
                rlim.rlim_cur = RLIM_INFINITY;
                rlim.rlim_max = RLIM_INFINITY;
                // Remove the maximum core size
                if (setrlimit(RLIMIT_CORE, &rlim) < 0)
        {
                struct rlimit rlim;
                rlim.rlim_cur = RLIM_INFINITY;
                rlim.rlim_max = RLIM_INFINITY;
                // Remove the maximum core size
                if (setrlimit(RLIMIT_CORE, &rlim) < 0)

-                       LOG(0, 0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
+                       LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
+

                // Make core dumps go to /tmp
                chdir("/tmp");
        }
                // Make core dumps go to /tmp
                chdir("/tmp");
        }


@@ -2997,18 +4091,18 @@ int main(int argc, char *argv[])
 
                if (get_nprocs() < 2)
                {
 
                if (get_nprocs() < 2)
                {

-                       LOG(0, 0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
+                       LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");

                        config->scheduler_fifo = 0;
                }
                else
                {
                        if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
                        {
                        config->scheduler_fifo = 0;
                }
                else
                {
                        if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
                        {

-                               LOG(1, 0, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
+                               LOG(1, 0, 0, "Using FIFO scheduler.  Say goodbye to any other processes running\n");

                        }
                        else
                        {
                        }
                        else
                        {

-                               LOG(0, 0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
+                               LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));

                                config->scheduler_fifo = 0;
                        }
                }
                                config->scheduler_fifo = 0;
                        }
                }


@@ -3018,346 +4112,134 @@ int main(int argc, char *argv[])
        if (cluster_init() < 0)
                exit(1);
 
        if (cluster_init() < 0)
                exit(1);
 

-#ifdef BGP
-       signal(SIGPIPE, SIG_IGN);
-       bgp_setup(config->as_number);
-       bgp_add_route(config->bind_address, 0xffffffff);
-       for (i = 0; i < BGP_NUM_PEERS; i++)
-       {
-               if (config->neighbour[i].name[0])
-                       bgp_start(&bgp_peers[i], config->neighbour[i].name,
-                               config->neighbour[i].as, config->neighbour[i].keepalive,
-                               config->neighbour[i].hold, 0); /* 0 = routing disabled */
-       }
-#endif /* BGP */
-

        inittun();
        inittun();

-       LOG(1, 0, 0, 0, "Set up on interface %s\n", config->tundevice);
-
-       initudp();
-       initrad();
-       initippool();
-
-       read_state();
-
-       signal(SIGHUP, sighup_handler);
-       signal(SIGTERM, sigterm_handler);
-       signal(SIGINT, sigterm_handler);
-       signal(SIGQUIT, sigquit_handler);
-       signal(SIGCHLD, sigchild_handler);
-
-       // Prevent us from getting paged out
-       if (config->lock_pages)
-       {
-               if (!mlockall(MCL_CURRENT))
-                       LOG(1, 0, 0, 0, "Locking pages into memory\n");
-               else
-                       LOG(0, 0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
-       }
-
-       alarm(1);
-
-       // Drop privileges here
-       if (config->target_uid > 0 && geteuid() == 0)
-               setuid(config->target_uid);
-
-       mainloop();
-
-#ifdef BGP
-       /* try to shut BGP down cleanly; with luck the sockets will be
-          writable since we're out of the select */
-       for (i = 0; i < BGP_NUM_PEERS; i++)
-               if (bgp_peers[i].state == Established)
-                       bgp_stop(&bgp_peers[i]);
-#endif /* BGP */
-
-       /* remove plugins (so cleanup code gets run) */
-       plugins_done();
-
-       // Remove the PID file if we wrote it
-       if (config->wrote_pid && *config->pid_file == '/')
-               unlink(config->pid_file);
-
-       /* kill CLI children */
-       signal(SIGTERM, SIG_IGN);
-       kill(0, SIGTERM);
-       return 0;
-}
-
-static void sighup_handler(int sig)
-{
-       if (log_stream && log_stream != stderr)
-       {
-               fclose(log_stream);
-               log_stream = NULL;
-       }
-
-       read_config_file();
-}
-
-static void sigalrm_handler(int sig)
-{
-       // Log current traffic stats
-
-       snprintf(config->bandwidth, sizeof(config->bandwidth),
-               "UDP-ETH:%1.0f/%1.0f  ETH-UDP:%1.0f/%1.0f  TOTAL:%0.1f   IN:%u OUT:%u",
-               (udp_rx / 1024.0 / 1024.0 * 8),
-               (eth_tx / 1024.0 / 1024.0 * 8),
-               (eth_rx / 1024.0 / 1024.0 * 8),
-               (udp_tx / 1024.0 / 1024.0 * 8),
-               ((udp_tx + udp_rx + eth_tx + eth_rx) / 1024.0 / 1024.0 * 8),
-               udp_rx_pkt, eth_rx_pkt);
-
-       udp_tx = udp_rx = 0;
-       udp_rx_pkt = eth_rx_pkt = 0;
-       eth_tx = eth_rx = 0;
-
-       if (config->dump_speed)
-               printf("%s\n", config->bandwidth);
-
-       // Update the internal time counter
-       time(&time_now);
-       strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
-       alarm(1);
-
-       {
-               // Run timer hooks
-               struct param_timer p = { time_now };
-               run_plugins(PLUGIN_TIMER, &p);
-       }
-
-}
-
-static void sigterm_handler(int sig)
-{
-       LOG(1, 0, 0, 0, "Shutting down cleanly\n");
-       if (config->save_state)
-               dump_state();
-
-       main_quit++;
-}
-
-static void sigquit_handler(int sig)
-{
-       int i;
-
-       LOG(1, 0, 0, 0, "Shutting down without saving sessions\n");
-       for (i = 1; i < MAXSESSION; i++)
-       {
-               if (session[i].opened)
-                       sessionkill(i, "L2TPNS Closing");
-       }
-       for (i = 1; i < MAXTUNNEL; i++)
-       {
-               if (tunnel[i].ip || tunnel[i].state)
-                       tunnelshutdown(i, "L2TPNS Closing");
-       }
-
-       main_quit++;
-}
-
-static void sigchild_handler(int sig)
-{
-       while (waitpid(-1, NULL, WNOHANG) > 0)
-           ;
-}
-
-static void read_state()
-{
-       struct stat sb;
-       int i;
-       ippoolt itmp;
-       FILE *f;
-       char magic[sizeof(DUMP_MAGIC) - 1];
-       u32 buf[2];
-
-       if (!config->save_state)
-       {
-               unlink(STATEFILE);
-               return ;
-       }
-
-       if (stat(STATEFILE, &sb) < 0)
-       {
-               unlink(STATEFILE);
-               return ;
-       }
-
-       if (sb.st_mtime < (time(NULL) - 60))
-       {
-               LOG(0, 0, 0, 0, "State file is too old to read, ignoring\n");
-               unlink(STATEFILE);
-               return ;
-       }
-
-       f = fopen(STATEFILE, "r");
-       unlink(STATEFILE);
-
-       if (!f)
-       {
-               LOG(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno));
-               exit(1);
-       }
-
-       if (fread(magic, sizeof(magic), 1, f) != 1 || strncmp(magic, DUMP_MAGIC, sizeof(magic)))
-       {
-               LOG(0, 0, 0, 0, "Bad state file magic\n");
-               exit(1);
-       }
-
-       LOG(1, 0, 0, 0, "Reading state information\n");
-       if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] > MAXIPPOOL || buf[1] != sizeof(ippoolt))
-       {
-               LOG(0, 0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
-               exit(1);
-       }
-
-       if (buf[0] > ip_pool_size)
-       {
-               LOG(0, 0, 0, 0, "ip pool has shrunk!  state = %d, current = %d\n", buf[0], ip_pool_size);
-               exit(1);
-       }
-
-       LOG(2, 0, 0, 0, "Loading %u ip addresses\n", buf[0]);
-       for (i = 0; i < buf[0]; i++)
-       {
-               if (fread(&itmp, sizeof(itmp), 1, f) != 1)
-               {
-                       LOG(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i, strerror(errno));
-                       exit(1);
-               }
-
-               if (itmp.address != ip_address_pool[i].address)
-               {
-                       LOG(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i);
-                       exit(1);
-               }
+       LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);

 
 

-               memcpy(&ip_address_pool[i], &itmp, sizeof(itmp));
-       }
+       initudp();
+       initrad();
+       initippool();

 
 

-       if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXTUNNEL || buf[1] != sizeof(tunnelt))
+       // seed prng

        {
        {

-               LOG(0, 0, 0, 0, "Error/mismatch reading tunnel header from state file\n");
-               exit(1);
+               unsigned seed = time_now ^ getpid();
+               LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
+               srand(seed);

        }
 
        }
 

-       LOG(2, 0, 0, 0, "Loading %u tunnels\n", MAXTUNNEL);
-       if (fread(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL)
-       {
-               LOG(0, 0, 0, 0, "Error reading tunnel data from state file\n");
-               exit(1);
-       }
+       signal(SIGHUP,  sighup_handler);
+       signal(SIGCHLD, sigchild_handler);
+       signal(SIGTERM, shutdown_handler);
+       signal(SIGINT,  shutdown_handler);
+       signal(SIGQUIT, shutdown_handler);

 
 

-       for (i = 0; i < MAXTUNNEL; i++)
+       // Prevent us from getting paged out
+       if (config->lock_pages)

        {
        {

-               tunnel[i].controlc = 0;
-               tunnel[i].controls = NULL;
-               tunnel[i].controle = NULL;
-               if (*tunnel[i].hostname)
-                       LOG(3, 0, 0, 0, "Created tunnel for %s\n", tunnel[i].hostname);
+               if (!mlockall(MCL_CURRENT))
+                       LOG(1, 0, 0, "Locking pages into memory\n");
+               else
+                       LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));

        }
 
        }
 

-       if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXSESSION || buf[1] != sizeof(sessiont))
-       {
-               LOG(0, 0, 0, 0, "Error/mismatch reading session header from state file\n");
-               exit(1);
-       }
+       alarm(1);

 
 

-       LOG(2, 0, 0, 0, "Loading %u sessions\n", MAXSESSION);
-       if (fread(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION)
-       {
-               LOG(0, 0, 0, 0, "Error reading session data from state file\n");
-               exit(1);
-       }
+       // Drop privileges here
+       if (config->target_uid > 0 && geteuid() == 0)
+               setuid(config->target_uid);

 
 

-       for (i = 0; i < MAXSESSION; i++)
-       {
-               session[i].tbf_in = 0;
-               session[i].tbf_out = 0;
-               if (session[i].opened)
-               {
-                       LOG(2, 0, i, 0, "Loaded active session for user %s\n", session[i].user);
-                       if (session[i].ip)
-                               sessionsetup(session[i].tunnel, i);
-               }
-       }
+       mainloop();

 
 

-       fclose(f);
-       LOG(0, 0, 0, 0, "Loaded saved state information\n");
+       /* remove plugins (so cleanup code gets run) */
+       plugins_done();
+
+       // Remove the PID file if we wrote it
+       if (config->wrote_pid && *config->pid_file == '/')
+               unlink(config->pid_file);
+
+       /* kill CLI children */
+       signal(SIGTERM, SIG_IGN);
+       kill(0, SIGTERM);
+       return 0;

 }
 
 }
 

-static void dump_state()
+static void sighup_handler(int sig)

 {
 {

-       FILE *f;
-       u32 buf[2];
+       if (log_stream)
+       {
+               if (log_stream != stderr)
+                       fclose(log_stream);

 
 

-       if (!config->save_state)
-               return;
+               log_stream = NULL;
+       }

 
 

-       do
-       {
-               if (!(f = fopen(STATEFILE, "w")))
-                       break;
+       read_config_file();
+}

 
 

-               LOG(1, 0, 0, 0, "Dumping state information\n");
+static void sigalrm_handler(int sig)
+{
+       // Log current traffic stats

 
 

-               if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC) - 1, 1, f) != 1)
-                       break;
+       snprintf(config->bandwidth, sizeof(config->bandwidth),
+               "UDP-ETH:%1.0f/%1.0f  ETH-UDP:%1.0f/%1.0f  TOTAL:%0.1f   IN:%u OUT:%u",
+               (udp_rx / 1024.0 / 1024.0 * 8),
+               (eth_tx / 1024.0 / 1024.0 * 8),
+               (eth_rx / 1024.0 / 1024.0 * 8),
+               (udp_tx / 1024.0 / 1024.0 * 8),
+               ((udp_tx + udp_rx + eth_tx + eth_rx) / 1024.0 / 1024.0 * 8),
+               udp_rx_pkt, eth_rx_pkt);

 
 

-               LOG(2, 0, 0, 0, "Dumping %u ip addresses\n", ip_pool_size);
-               buf[0] = ip_pool_size;
-               buf[1] = sizeof(ippoolt);
-               if (fwrite(buf, sizeof(buf), 1, f) != 1)
-                       break;
-               if (fwrite(ip_address_pool, sizeof(ippoolt), ip_pool_size, f) != ip_pool_size)
-                       break;
+       udp_tx = udp_rx = 0;
+       udp_rx_pkt = eth_rx_pkt = 0;
+       eth_tx = eth_rx = 0;

 
 

-               LOG(2, 0, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL);
-               buf[0] = MAXTUNNEL;
-               buf[1] = sizeof(tunnelt);
-               if (fwrite(buf, sizeof(buf), 1, f) != 1)
-                       break;
-               if (fwrite(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL)
-                       break;
+       if (config->dump_speed)
+               printf("%s\n", config->bandwidth);

 
 

-               LOG(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION);
-               buf[0] = MAXSESSION;
-               buf[1] = sizeof(sessiont);
-               if (fwrite(buf, sizeof(buf), 1, f) != 1)
-                       break;
-               if (fwrite(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION)
-                       break;
+       // Update the internal time counter
+       time(&time_now);
+       strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
+       alarm(1);

 
 

-               if (fclose(f) == 0)
-                       return ; // OK
+       {
+               // Run timer hooks
+               struct param_timer p = { time_now };
+               run_plugins(PLUGIN_TIMER, &p);

        }
        }

-       while (0);

 
 

-       LOG(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno));
-       unlink(STATEFILE);

 }
 
 }
 

-static void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response)
+static void shutdown_handler(int sig)
+{
+       LOG(1, 0, 0, "Shutting down\n");
+       main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
+}
+
+static void sigchild_handler(int sig)
+{
+       while (waitpid(-1, NULL, WNOHANG) > 0)
+           ;
+}
+
+static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)

 {
        MD5_CTX ctx;
        *challenge_response = NULL;
 
 {
        MD5_CTX ctx;
        *challenge_response = NULL;
 

-       if (!*config->l2tpsecret)
+       if (!*config->l2tp_secret)

        {
        {

-               LOG(0, 0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
+               LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");

                return;
        }
 
                return;
        }
 

-       LOG(4, 0, 0, 0, "   Building challenge response for CHAP request\n");
+       LOG(4, 0, 0, "   Building challenge response for CHAP request\n");

 
 

-       *challenge_response = (char *)calloc(17, 1);
+       *challenge_response = calloc(17, 1);

 
 

-       MD5Init(&ctx);
-       MD5Update(&ctx, &id, 1);
-       MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
-       MD5Update(&ctx, challenge, challenge_length);
-       MD5Final(*challenge_response, &ctx);
+       MD5_Init(&ctx);
+       MD5_Update(&ctx, &id, 1);
+       MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
+       MD5_Update(&ctx, challenge, challenge_length);
+       MD5_Final(*challenge_response, &ctx);

 
        return;
 }
 
        return;
 }


@@ -3376,6 +4258,7 @@ static int facility_value(char *name)
 static void update_config()
 {
        int i;
 static void update_config()
 {
        int i;

+       char *p;

        static int timeout = 0;
        static int interval = 0;
 
        static int timeout = 0;
        static int interval = 0;
 


@@ -3384,9 +4267,12 @@ static void update_config()
        syslog_log = 0;
        if (log_stream)
        {
        syslog_log = 0;
        if (log_stream)
        {

-               fclose(log_stream);
+               if (log_stream != stderr)
+                       fclose(log_stream);
+

                log_stream = NULL;
        }
                log_stream = NULL;
        }

+

        if (*config->log_filename)
        {
                if (strstr(config->log_filename, "syslog:") == config->log_filename)
        if (*config->log_filename)
        {
                if (strstr(config->log_filename, "syslog:") == config->log_filename)


@@ -3418,6 +4304,16 @@ static void update_config()
                setbuf(log_stream, NULL);
        }
 
                setbuf(log_stream, NULL);
        }
 

+#define L2TP_HDRS              (20+8+6+4)      // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
+#define TCP_HDRS               (20+20)         // TCP encapsulation: ip + tcp
+
+       if (config->l2tp_mtu <= 0)              config->l2tp_mtu = PPPMTU;
+       else if (config->l2tp_mtu < MINMTU)     config->l2tp_mtu = MINMTU;
+       else if (config->l2tp_mtu > MAXMTU)     config->l2tp_mtu = MAXMTU;
+
+       // reset MRU/MSS globals
+       MRU = config->l2tp_mtu - L2TP_HDRS;
+       MSS = MRU - TCP_HDRS;

 
        // Update radius
        config->numradiusservers = 0;
 
        // Update radius
        config->numradiusservers = 0;


@@ -3432,18 +4328,72 @@ static void update_config()
                        // test twice, In case someone works with
                        // a secondary radius server without defining
                        // a primary one, this will work even then.
                        // test twice, In case someone works with
                        // a secondary radius server without defining
                        // a primary one, this will work even then.

-                       if (i>0 && !config->radiusport[i])
+                       if (i > 0 && !config->radiusport[i])

                                config->radiusport[i] = config->radiusport[i-1];
                        if (!config->radiusport[i])
                                config->radiusport[i] = RADPORT;
                }
 
        if (!config->numradiusservers)
                                config->radiusport[i] = config->radiusport[i-1];
                        if (!config->radiusport[i])
                                config->radiusport[i] = RADPORT;
                }
 
        if (!config->numradiusservers)

+               LOG(0, 0, 0, "No RADIUS servers defined!\n");
+
+       // parse radius_authtypes_s
+       config->radius_authtypes = config->radius_authprefer = 0;
+       p = config->radius_authtypes_s;
+       while (p && *p)
+       {
+               char *s = strpbrk(p, " \t,");
+               int type = 0;
+
+               if (s)
+               {
+                       *s++ = 0;
+                       while (*s == ' ' || *s == '\t')
+                               s++;
+
+                       if (!*s)
+                               s = 0;
+               }
+
+               if (!strncasecmp("chap", p, strlen(p)))
+                       type = AUTHCHAP;
+               else if (!strncasecmp("pap", p, strlen(p)))
+                       type = AUTHPAP;
+               else
+                       LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
+
+               config->radius_authtypes |= type;
+               if (!config->radius_authprefer)
+                       config->radius_authprefer = type;
+
+               p = s;
+       }
+
+       if (!config->radius_authtypes)
+       {
+               LOG(0, 0, 0, "Defaulting to PAP authentication\n");
+               config->radius_authtypes = config->radius_authprefer = AUTHPAP;
+       }
+
+       // normalise radius_authtypes_s
+       if (config->radius_authprefer == AUTHPAP)
+       {
+               strcpy(config->radius_authtypes_s, "pap");
+               if (config->radius_authtypes & AUTHCHAP)
+                       strcat(config->radius_authtypes_s, ", chap");
+       }
+       else

        {
        {

-               LOG(0, 0, 0, 0, "No RADIUS servers defined!\n");
+               strcpy(config->radius_authtypes_s, "chap");
+               if (config->radius_authtypes & AUTHPAP)
+                       strcat(config->radius_authtypes_s, ", pap");

        }
 
        }
 

-       config->num_radfds = 2 << RADIUS_SHIFT;
+       if (!config->radius_dae_port)
+               config->radius_dae_port = DAEPORT;
+
+       // re-initialise the random number source
+       initrandom(config->random_device);

 
        // Update plugins
        for (i = 0; i < MAXPLUGINS; i++)
 
        // Update plugins
        for (i = 0; i < MAXPLUGINS; i++)


@@ -3462,8 +4412,8 @@ static void update_config()
                        remove_plugin(config->old_plugins[i]);
                }
        }
                        remove_plugin(config->old_plugins[i]);
                }
        }

+

        memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
        memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));

-       if (!config->cleanup_interval) config->cleanup_interval = 10;

        if (!config->multi_read_count) config->multi_read_count = 10;
        if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
        if (!*config->cluster_interface)
        if (!config->multi_read_count) config->multi_read_count = 10;
        if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
        if (!*config->cluster_interface)


@@ -3483,7 +4433,7 @@ static void update_config()
 
                if (config->cluster_hb_timeout < t)
                {
 
                if (config->cluster_hb_timeout < t)
                {

-                       LOG(0,0,0,0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
+                       LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);

                        config->cluster_hb_timeout = t;
                }
 
                        config->cluster_hb_timeout = t;
                }
 


@@ -3507,7 +4457,7 @@ static void update_config()
                }
                else
                {
                }
                else
                {

-                       LOG(0, 0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
+                       LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));

                }
        }
 
                }
        }
 


@@ -3525,36 +4475,36 @@ static void read_config_file()
                return;
        }
 
                return;
        }
 

-       LOG(3, 0, 0, 0, "Reading config file %s\n", config->config_file);
+       LOG(3, 0, 0, "Reading config file %s\n", config->config_file);

        cli_do_file(f);
        cli_do_file(f);

-       LOG(3, 0, 0, 0, "Done reading config file\n");
+       LOG(3, 0, 0, "Done reading config file\n");

        fclose(f);
        update_config();
 }
 
        fclose(f);
        update_config();
 }
 

-int sessionsetup(tunnelidt t, sessionidt s)
+int sessionsetup(sessionidt s, tunnelidt t)

 {
        // A session now exists, set it up
 {
        // A session now exists, set it up

-       ipt ip;
+       in_addr_t ip;

        char *user;
        sessionidt i;
        int r;
 
        char *user;
        sessionidt i;
        int r;
 

-       CSTAT(call_sessionsetup);
+       CSTAT(sessionsetup);

 
 

-       LOG(3, session[s].ip, s, t, "Doing session setup for session\n");
+       LOG(3, s, t, "Doing session setup for session\n");

 
 

-       if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
+       if (!session[s].ip)

        {
                assign_ip_address(s);
                if (!session[s].ip)
                {
        {
                assign_ip_address(s);
                if (!session[s].ip)
                {

-                       LOG(0, 0, s, t, "   No IP allocated. The IP address pool is FULL!\n");
-                       sessionshutdown(s, "No IP addresses available");
+                       LOG(0, s, t, "   No IP allocated.  The IP address pool is FULL!\n");
+                       sessionshutdown(s, "No IP addresses available.", 2, 7); // try another

                        return 0;
                }
                        return 0;
                }

-               LOG(3, 0, s, t, "   No IP allocated. Assigned %s from pool\n",
-                       inet_toa(htonl(session[s].ip)));
+               LOG(3, s, t, "   No IP allocated.  Assigned %s from pool\n",
+                       fmtaddr(htonl(session[s].ip), 0));

        }
 
 
        }
 
 


@@ -3570,33 +4520,49 @@ int sessionsetup(tunnelidt t, sessionidt s)
                for (i = 1; i <= config->cluster_highest_sessionid; i++)
                {
                        if (i == s) continue;
                for (i = 1; i <= config->cluster_highest_sessionid; i++)
                {
                        if (i == s) continue;

-                       if (ip == session[i].ip) sessionkill(i, "Duplicate IP address");
-                       if (!session[s].walled_garden && !session[i].walled_garden && strcasecmp(user, session[i].user) == 0)
+                       if (!session[s].opened) continue;
+                       if (ip == session[i].ip)
+                       {
+                               sessionkill(i, "Duplicate IP address");
+                               continue;
+                       }
+
+                       if (config->allow_duplicate_users) continue;
+                       if (session[s].walled_garden || session[i].walled_garden) continue;
+                       if (!strcasecmp(user, session[i].user))

                                sessionkill(i, "Duplicate session for users");
                }
        }
 
                                sessionkill(i, "Duplicate session for users");
                }
        }
 

+       {
+               int routed = 0;
+

                // Add the route for this session.
                // Add the route for this session.

-               //
-               // Static IPs need to be routed. Anything else
-               // is part of the IP address pool and is already routed,
-               // it just needs to be added to the IP cache.
-       if (session[s].ip_pool_index == -1) // static ip
-               routeset(s, session[s].ip, 0, 0, 1);
-       else
-               cache_ipmap(session[s].ip, s);
+               for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
+               {
+                       if ((session[s].ip & session[s].route[r].mask) ==
+                           (session[s].route[r].ip & session[s].route[r].mask))
+                               routed++;

 
 

-       for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
-               routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
+                       routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
+               }

 
 

-       if (!session[s].unique_id)
-       {
-               // did this session just finish radius?
-               LOG(3, session[s].ip, s, t, "Sending initial IPCP to client\n");
-               sendipcp(t, s);
-               session[s].unique_id = ++last_id;
+               // Static IPs need to be routed if not already
+               // convered by a Framed-Route.  Anything else is part
+               // of the IP address pool and is already routed, it
+               // just needs to be added to the IP cache.
+               // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
+               if (session[s].ip_pool_index == -1) // static ip
+               {
+                       if (!routed) routeset(s, session[s].ip, 0, 0, 1);
+               }
+               else
+                       cache_ipmap(session[s].ip, s);

        }
 
        }
 

+       sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
+       lcp_open(s, t); // transition to Network phase and send initial IPCP
+

        // Run the plugin's against this new session.
        {
                struct param_new_session data = { &tunnel[t], &session[s] };
        // Run the plugin's against this new session.
        {
                struct param_new_session data = { &tunnel[t], &session[s] };


@@ -3609,15 +4575,9 @@ int sessionsetup(tunnelidt t, sessionidt s)
 
        session[s].last_packet = time_now;
 
 
        session[s].last_packet = time_now;
 

-       {
-               char *sessionip, *tunnelip;
-               sessionip = strdup(inet_toa(htonl(session[s].ip)));
-               tunnelip = strdup(inet_toa(htonl(tunnel[t].ip)));
-               LOG(2, session[s].ip, s, t, "Login by %s at %s from %s (%s)\n",
-                               session[s].user, sessionip, tunnelip, tunnel[t].hostname);
-               if (sessionip) free(sessionip);
-               if (tunnelip) free(tunnelip);
-       }
+       LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
+               fmtaddr(htonl(session[s].ip), 0),
+               fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);

 
        cluster_send_session(s);        // Mark it as dirty, and needing to the flooded to the cluster.
 
 
        cluster_send_session(s);        // Mark it as dirty, and needing to the flooded to the cluster.
 


@@ -3631,12 +4591,13 @@ int sessionsetup(tunnelidt t, sessionidt s)
 int load_session(sessionidt s, sessiont *new)
 {
        int i;
 int load_session(sessionidt s, sessiont *new)
 {
        int i;

+       int newip = 0;

 
                // Sanity checks.
        if (new->ip_pool_index >= MAXIPPOOL ||
                new->tunnel >= MAXTUNNEL)
        {
 
                // Sanity checks.
        if (new->ip_pool_index >= MAXIPPOOL ||
                new->tunnel >= MAXTUNNEL)
        {

-               LOG(0,0,s,0, "Strange session update received!\n");
+               LOG(0, s, 0, "Strange session update received!\n");

                        // FIXME! What to do here?
                return 0;
        }
                        // FIXME! What to do here?
                return 0;
        }


@@ -3648,58 +4609,99 @@ int load_session(sessionidt s, sessiont *new)
 
        session[s].tunnel = new->tunnel; // For logging in cache_ipmap
 
 
        session[s].tunnel = new->tunnel; // For logging in cache_ipmap
 

+       // See if routes/ip cache need updating
+       if (new->ip != session[s].ip)
+               newip++;
+
+       for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
+               if (new->route[i].ip != session[s].route[i].ip ||
+                   new->route[i].mask != session[s].route[i].mask)
+                       newip++;

 
 

-       if (new->ip != session[s].ip)   // Changed ip. fix up hash tables.
+       // needs update
+       if (newip)

        {
        {

-               if (session[s].ip)      // If there's an old one, remove it.
+               int routed = 0;
+
+               // remove old routes...
+               for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)

                {
                {

-                       // Remove any routes if the IP has changed
-                       for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
-                       {
-                               routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
-                               session[s].route[i].ip = 0;
-                       }
+                       if ((session[s].ip & session[s].route[i].mask) ==
+                           (session[s].route[i].ip & session[s].route[i].mask))
+                               routed++;
+
+                       routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
+               }

 
 

+               // ...ip
+               if (session[s].ip)
+               {

                        if (session[s].ip_pool_index == -1) // static IP
                        if (session[s].ip_pool_index == -1) // static IP

-                               routeset(s, session[s].ip, 0, 0, 0);
+                       {
+                               if (!routed) routeset(s, session[s].ip, 0, 0, 0);
+                       }

                        else            // It's part of the IP pool, remove it manually.
                                uncache_ipmap(session[s].ip);
                }
 
                        else            // It's part of the IP pool, remove it manually.
                                uncache_ipmap(session[s].ip);
                }
 

+               routed = 0;
+
+               // add new routes...
+               for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
+               {
+                       if ((new->ip & new->route[i].mask) ==
+                           (new->route[i].ip & new->route[i].mask))
+                               routed++;
+
+                       routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
+               }
+
+               // ...ip

                if (new->ip)
                {
                        // If there's a new one, add it.
                        if (new->ip_pool_index == -1)
                if (new->ip)
                {
                        // If there's a new one, add it.
                        if (new->ip_pool_index == -1)

-                               routeset(s, new->ip, 0, 0, 1);
+                       {
+                               if (!routed) routeset(s, new->ip, 0, 0, 1);
+                       }

                        else
                                cache_ipmap(new->ip, s);
                }
        }
 
                        else
                                cache_ipmap(new->ip, s);
                }
        }
 

-       // Update routed networks
-       for (i = 0; i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
+       // check v6 routing
+       if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
+                   route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
+
+       // check filters
+       if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))

        {
        {

-               if (new->route[i].ip == session[s].route[i].ip &&
-                   new->route[i].mask == session[s].route[i].mask)
-                       continue;
+               LOG(2, s, session[s].tunnel, "Dropping invalid input filter %d\n", (int) new->filter_in);
+               new->filter_in = 0;
+       }

 
 

-               if (session[s].route[i].ip) // Remove the old one if it exists.
-                       routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
+       if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
+       {
+               LOG(2, s, session[s].tunnel, "Dropping invalid output filter %d\n", (int) new->filter_out);
+               new->filter_out = 0;
+       }

 
 

-               if (new->route[i].ip)   // Add the new one if it exists.
-                       routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
+       if (new->filter_in != session[s].filter_in)
+       {
+               if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
+               if (new->filter_in)       ip_filters[new->filter_in - 1].used++;
+       }
+
+       if (new->filter_out != session[s].filter_out)
+       {
+               if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
+               if (new->filter_out)       ip_filters[new->filter_out - 1].used++;

        }
 
        if (new->tunnel && s > config->cluster_highest_sessionid)       // Maintain this in the slave. It's used
                                        // for walking the sessions to forward byte counts to the master.
                config->cluster_highest_sessionid = s;
 
        }
 
        if (new->tunnel && s > config->cluster_highest_sessionid)       // Maintain this in the slave. It's used
                                        // for walking the sessions to forward byte counts to the master.
                config->cluster_highest_sessionid = s;
 

-       // TEMP: old session struct used a u32 to define the throttle
-       // speed for both up/down, new uses a u16 for each.  Deal with
-       // sessions from an old master for migration.
-       if (new->throttle_out == 0 && new->tbf_out)
-               new->throttle_out = new->throttle_in;
-

        memcpy(&session[s], new, sizeof(session[s]));   // Copy over..
 
                // Do fixups into address pool.
        memcpy(&session[s], new, sizeof(session[s]));   // Copy over..
 
                // Do fixups into address pool.


@@ -3724,7 +4726,7 @@ static void *open_plugin(char *plugin_name, int load)
        char path[256] = "";
 
        snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
        char path[256] = "";
 
        snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);

-       LOG(2, 0, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
+       LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);

        return dlopen(path, RTLD_NOW);
 }
 
        return dlopen(path, RTLD_NOW);
 }
 


@@ -3740,14 +4742,14 @@ static void *getconfig(char *key, enum config_typet type)
                        if (config_values[i].type == type)
                                return ((void *) config) + config_values[i].offset;
 
                        if (config_values[i].type == type)
                                return ((void *) config) + config_values[i].offset;
 

-                       LOG(1, 0, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
+                       LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",

                                key, type, config_values[i].type);
 
                        return 0;
                }
        }
 
                                key, type, config_values[i].type);
 
                        return 0;
                }
        }
 

-       LOG(1, 0, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
+       LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);

        return 0;
 }
 
        return 0;
 }
 


@@ -3756,13 +4758,14 @@ static int add_plugin(char *plugin_name)
        static struct pluginfuncs funcs = {
                _log,
                _log_hex,
        static struct pluginfuncs funcs = {
                _log,
                _log_hex,

-               inet_toa,
+               fmtaddr,

                sessionbyuser,
                sessiontbysessionidt,
                sessionidtbysessiont,
                radiusnew,
                radiussend,
                getconfig,
                sessionbyuser,
                sessiontbysessionidt,
                sessionidtbysessiont,
                radiusnew,
                radiussend,
                getconfig,

+               sessionshutdown,

                sessionkill,
                throttle_session,
                cluster_send_session,
                sessionkill,
                throttle_session,
                cluster_send_session,


@@ -3774,7 +4777,7 @@ static int add_plugin(char *plugin_name)
 
        if (!p)
        {
 
        if (!p)
        {

-               LOG(1, 0, 0, 0, "   Plugin load failed: %s\n", dlerror());
+               LOG(1, 0, 0, "   Plugin load failed: %s\n", dlerror());

                return -1;
        }
 
                return -1;
        }
 


@@ -3788,7 +4791,7 @@ static int add_plugin(char *plugin_name)
                int *v = dlsym(p, "plugin_api_version");
                if (!v || *v != PLUGIN_API_VERSION)
                {
                int *v = dlsym(p, "plugin_api_version");
                if (!v || *v != PLUGIN_API_VERSION)
                {

-                       LOG(1, 0, 0, 0, "   Plugin load failed: API version mismatch: %s\n", dlerror());
+                       LOG(1, 0, 0, "   Plugin load failed: API version mismatch: %s\n", dlerror());

                        dlclose(p);
                        return -1;
                }
                        dlclose(p);
                        return -1;
                }


@@ -3798,7 +4801,7 @@ static int add_plugin(char *plugin_name)
        {
                if (!initfunc(&funcs))
                {
        {
                if (!initfunc(&funcs))
                {

-                       LOG(1, 0, 0, 0, "   Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
+                       LOG(1, 0, 0, "   Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());

                        dlclose(p);
                        return -1;
                }
                        dlclose(p);
                        return -1;
                }


@@ -3811,12 +4814,12 @@ static int add_plugin(char *plugin_name)
                void *x;
                if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
                {
                void *x;
                if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
                {

-                       LOG(3, 0, 0, 0, "   Supports function \"%s\"\n", plugin_functions[i]);
+                       LOG(3, 0, 0, "   Supports function \"%s\"\n", plugin_functions[i]);

                        ll_push(plugins[i], x);
                }
        }
 
                        ll_push(plugins[i], x);
                }
        }
 

-       LOG(2, 0, 0, 0, "   Loaded plugin %s\n", plugin_name);
+       LOG(2, 0, 0, "   Loaded plugin %s\n", plugin_name);

        return 1;
 }
 
        return 1;
 }
 


@@ -3852,24 +4855,27 @@ static int remove_plugin(char *plugin_name)
        }
 
        dlclose(p);
        }
 
        dlclose(p);

-       LOG(2, 0, 0, 0, "Removed plugin %s\n", plugin_name);
+       LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);

        return loaded;
 }
 
 int run_plugins(int plugin_type, void *data)
 {
        int (*func)(void *data);
        return loaded;
 }
 
 int run_plugins(int plugin_type, void *data)
 {
        int (*func)(void *data);

-       if (!plugins[plugin_type] || plugin_type > max_plugin_functions) return 1;
+
+       if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
+               return PLUGIN_RET_ERROR;

 
        ll_reset(plugins[plugin_type]);
        while ((func = ll_next(plugins[plugin_type])))
        {
 
        ll_reset(plugins[plugin_type]);
        while ((func = ll_next(plugins[plugin_type])))
        {

-               int rc;
-               rc = func(data);
-               if (rc == PLUGIN_RET_STOP) return 1;
-               if (rc == PLUGIN_RET_ERROR) return 0;
+               int r = func(data);
+
+               if (r != PLUGIN_RET_OK)
+                       return r; // stop here

        }
        }

-       return 1;
+
+       return PLUGIN_RET_OK;

 }
 
 static void plugins_done()
 }
 
 static void plugins_done()


@@ -3881,7 +4887,7 @@ static void plugins_done()
                run_plugin_done(p);
 }
 
                run_plugin_done(p);
 }
 

-static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen)
+static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)

 {
        struct nsctl request;
        struct nsctl response;
 {
        struct nsctl request;
        struct nsctl response;


@@ -3893,11 +4899,12 @@ static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen
        {
                if (type < 0)
                {
        {
                if (type < 0)
                {

-                       LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Bogus control message (%d)\n", type);
+                       LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
+                               fmtaddr(addr->sin_addr.s_addr, 0), type);

                }
                else
                {
                }
                else
                {

-                       LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received ");
+                       LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));

                        dump_control(&request, log_stream);
                }
        }
                        dump_control(&request, log_stream);
                }
        }


@@ -3966,8 +4973,17 @@ static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen
 
        case NSCTL_REQ_CONTROL:
                {
 
        case NSCTL_REQ_CONTROL:
                {

-                       struct param_control param = { request.argc, request.argv, 0, NULL };
-                       if (!run_plugins(PLUGIN_CONTROL, &param))
+                       struct param_control param = {
+                               config->cluster_iam_master,
+                               request.argc,
+                               request.argv,
+                               0,
+                               NULL,
+                       };
+
+                       int r = run_plugins(PLUGIN_CONTROL, &param);
+
+                       if (r == PLUGIN_RET_ERROR)

                        {
                                response.type = NSCTL_RES_ERR;
                                response.argc = 1;
                        {
                                response.type = NSCTL_RES_ERR;
                                response.argc = 1;


@@ -3975,6 +4991,22 @@ static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen
                                        ? param.additional
                                        : "error returned by plugin";
                        }
                                        ? param.additional
                                        : "error returned by plugin";
                        }

+                       else if (r == PLUGIN_RET_NOTMASTER)
+                       {
+                               static char msg[] = "must be run on master: 000.000.000.000";
+
+                               response.type = NSCTL_RES_ERR;
+                               response.argc = 1;
+                               if (config->cluster_master_address)
+                               {
+                                       strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
+                                       response.argv[0] = msg;
+                               }
+                               else
+                               {
+                                       response.argv[0] = "must be run on master: none elected";
+                               }
+                       }

                        else if (!(param.response & NSCTL_RESPONSE))
                        {
                                response.type = NSCTL_RES_ERR;
                        else if (!(param.response & NSCTL_RESPONSE))
                        {
                                response.type = NSCTL_RES_ERR;


@@ -4006,7 +5038,7 @@ static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen
        buf = calloc(NSCTL_MAX_PKT_SZ, 1);
        if (!buf)
        {
        buf = calloc(NSCTL_MAX_PKT_SZ, 1);
        if (!buf)
        {

-               LOG(2, ntohl(addr->sin_addr.s_addr), 0, 0, "Failed to allocate nsctl response\n");
+               LOG(2, 0, 0, "Failed to allocate nsctl response\n");

                return;
        }
 
                return;
        }
 


@@ -4016,12 +5048,13 @@ static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen
                sendto(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen);
                if (log_stream && config->debug >= 4)
                {
                sendto(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen);
                if (log_stream && config->debug >= 4)
                {

-                       LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Sent ");
+                       LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));

                        dump_control(&response, log_stream);
                }
        }
        else
                        dump_control(&response, log_stream);
                }
        }
        else

-               LOG(2, ntohl(addr->sin_addr.s_addr), 0, 0, "Failed to pack nsctl response (%d)\n", r);
+               LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
+                       fmtaddr(addr->sin_addr.s_addr, 0), r);

 
        free(buf);
 }
 
        free(buf);
 }


@@ -4033,13 +5066,13 @@ static tunnelidt new_tunnel()
        {
                if (tunnel[i].state == TUNNELFREE)
                {
        {
                if (tunnel[i].state == TUNNELFREE)
                {

-                       LOG(4, 0, 0, i, "Assigning tunnel ID %d\n", i);
+                       LOG(4, 0, i, "Assigning tunnel ID %d\n", i);

                        if (i > config->cluster_highest_tunnelid)
                                config->cluster_highest_tunnelid = i;
                        return i;
                }
        }
                        if (i > config->cluster_highest_tunnelid)
                                config->cluster_highest_tunnelid = i;
                        return i;
                }
        }

-       LOG(0, 0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
+       LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");

        return 0;
 }
 
        return 0;
 }
 


@@ -4053,6 +5086,9 @@ static tunnelidt new_tunnel()
 void become_master(void)
 {
        int s, i;
 void become_master(void)
 {
        int s, i;

+       static struct event_data d[RADIUS_FDS];
+       struct epoll_event e;
+

        run_plugins(PLUGIN_BECOME_MASTER, NULL);
 
        // running a bunch of iptables commands is slow and can cause
        run_plugins(PLUGIN_BECOME_MASTER, NULL);
 
        // running a bunch of iptables commands is slow and can cause


@@ -4062,7 +5098,7 @@ void become_master(void)
        {
                for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
                {
        {
                for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
                {

-                       if (!session[s].tunnel) // Not an in-use session.
+                       if (!session[s].opened) // Not an in-use session.

                                continue;
 
                        run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
                                continue;
 
                        run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);


@@ -4071,11 +5107,14 @@ void become_master(void)
        }
 
        // add radius fds
        }
 
        // add radius fds

-       for (i = 0; i < config->num_radfds; i++)
+       e.events = EPOLLIN;
+       for (i = 0; i < RADIUS_FDS; i++)

        {
        {

-               FD_SET(radfds[i], &readset);
-               if (radfds[i] > readset_n)
-                       readset_n = radfds[i];
+               d[i].type = FD_TYPE_RADIUS;
+               d[i].index = i;
+               e.data.ptr = &d[i];
+
+               epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);

        }
 }
 
        }
 }
 


@@ -4094,7 +5133,7 @@ int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc
        for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
        {
                int idle;
        for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
        {
                int idle;

-               if (!session[s].tunnel)
+               if (!session[s].opened)

                        continue;
 
                idle = time_now - session[s].last_packet;
                        continue;
 
                idle = time_now - session[s].last_packet;


@@ -4132,7 +5171,7 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc
        for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
        {
                int open = 0, d;
        for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
        {
                int open = 0, d;

-               if (!session[s].tunnel)
+               if (!session[s].opened)

                        continue;
 
                d = time_now - session[s].opened;
                        continue;
 
                d = time_now - session[s].opened;


@@ -4159,74 +5198,184 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc
 
 /* Unhide an avp.
  *
 
 /* Unhide an avp.
  *

- * This unencodes the AVP using the L2TP CHAP secret and the
- * previously stored random vector. It replaces the hidden data with
- * the cleartext data and returns the length of the cleartext data
- * (including the AVP "header" of 6 bytes).
- *
- * Based on code from rp-l2tpd by Roaring Penguin Software Inc.
+ * This unencodes the AVP using the L2TP secret and the previously
+ * stored random vector.  It overwrites the hidden data with the
+ * unhidden AVP subformat.

  */
  */

-static int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length)
+static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)

 {
        MD5_CTX ctx;
 {
        MD5_CTX ctx;

-       u8 *cursor;
-       u8 digest[16];
-       u8 working_vector[16];
-       uint16_t hidden_length;
-       u8 type[2];
-       size_t done, todo;
-       u8 *output;
+       uint8_t digest[16];
+       uint8_t *last;
+       size_t d = 0;
+       uint16_t m = htons(type);

 
 

-       // Find the AVP type.
-       type[0] = *(avp + 4);
-       type[1] = *(avp + 5);
+       // Compute initial pad
+       MD5_Init(&ctx);
+       MD5_Update(&ctx, (unsigned char *) &m, 2);
+       MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
+       MD5_Update(&ctx, vector, vec_len);
+       MD5_Final(digest, &ctx);

 
 

-       // Line up with the hidden data
-       cursor = output = avp + 6;
+       // pointer to last decoded 16 octets
+       last = value;

 
 

-       // Compute initial pad
-       MD5Init(&ctx);
-       MD5Update(&ctx, type, 2);
-       MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
-       MD5Update(&ctx, session[s].random_vector, session[s].random_vector_length);
-       MD5Final(digest, &ctx);
+       while (len > 0)
+       {
+               // calculate a new pad based on the last decoded block
+               if (d >= sizeof(digest))
+               {
+                       MD5_Init(&ctx);
+                       MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
+                       MD5_Update(&ctx, last, sizeof(digest));
+                       MD5_Final(digest, &ctx);
+
+                       d = 0;
+                       last = value;
+               }
+
+               *value++ ^= digest[d++];
+               len--;
+       }
+}
+
+int find_filter(char const *name, size_t len)
+{
+       int free = -1;
+       int i;
+
+       for (i = 0; i < MAXFILTER; i++)
+       {
+               if (!*ip_filters[i].name)
+               {
+                       if (free < 0)
+                               free = i;
+
+                       continue;
+               }
+
+               if (strlen(ip_filters[i].name) != len)
+                       continue;
+
+               if (!strncmp(ip_filters[i].name, name, len))
+                       return i;
+       }
+                       
+       return free;
+}

 
 

-       // Get hidden length
-       hidden_length = ((uint16_t) (digest[0] ^ cursor[0])) * 256 + (uint16_t) (digest[1] ^ cursor[1]);
+static int ip_filter_port(ip_filter_portt *p, uint16_t port)
+{
+       switch (p->op)
+       {
+       case FILTER_PORT_OP_EQ:    return port == p->port;
+       case FILTER_PORT_OP_NEQ:   return port != p->port;
+       case FILTER_PORT_OP_GT:    return port > p->port;
+       case FILTER_PORT_OP_LT:    return port < p->port;
+       case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
+       }

 
 

-       // Keep these for later use
-       working_vector[0] = *cursor;
-       working_vector[1] = *(cursor + 1);
-       cursor += 2;
+       return 0;
+}

 
 

-       if (hidden_length > length - 8)
+static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
+{
+       switch (op)

        {
        {

-               LOG(1, 0, s, t, "Hidden length %d too long in AVP of length %d\n", (int) hidden_length, (int) length);
+       case FILTER_FLAG_OP_ANY:
+               return (flags & sflags) || (~flags & cflags);
+
+       case FILTER_FLAG_OP_ALL:
+               return (flags & sflags) == sflags && (~flags & cflags) == cflags;
+
+       case FILTER_FLAG_OP_EST:
+               return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
+       }
+
+       return 0;
+}
+
+int ip_filter(uint8_t *buf, int len, uint8_t filter)
+{
+       uint16_t frag_offset;
+       uint8_t proto;
+       in_addr_t src_ip;
+       in_addr_t dst_ip;
+       uint16_t src_port = 0;
+       uint16_t dst_port = 0;
+       uint8_t flags = 0;
+       ip_filter_rulet *rule;
+
+       if (len < 20) // up to end of destination address
+               return 0;
+
+       if ((*buf >> 4) != 4) // IPv4

                return 0;
                return 0;

+
+       frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
+       proto = buf[9];
+       src_ip = *(in_addr_t *) (buf + 12);
+       dst_ip = *(in_addr_t *) (buf + 16);
+
+       if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
+       {
+               int l = (buf[0] & 0xf) * 4; // length of IP header
+               if (len < l + 4) // ports
+                       return 0;
+
+               src_port = ntohs(*(uint16_t *) (buf + l));
+               dst_port = ntohs(*(uint16_t *) (buf + l + 2));
+               if (proto == IPPROTO_TCP)
+               {
+                       if (len < l + 14) // flags
+                               return 0;
+
+                       flags = buf[l + 13] & 0x3f;
+               }

        }
 
        }
 

-       /* Decrypt remainder */
-       done = 2;
-       todo = hidden_length;
-       while (todo)
+       for (rule = ip_filters[filter].rules; rule->action; rule++)

        {
        {

-               working_vector[done] = *cursor;
-               *output = digest[done] ^ *cursor;
-               ++output;
-               ++cursor;
-               --todo;
-               ++done;
-               if (done == 16 && todo)
+               if (rule->proto != IPPROTO_IP && proto != rule->proto)
+                       continue;
+
+               if (rule->src_wild != INADDR_BROADCAST &&
+                   (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
+                       continue;
+
+               if (rule->dst_wild != INADDR_BROADCAST &&
+                   (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
+                       continue;
+
+               if (frag_offset)
+               {
+                       if (!rule->frag || rule->action == FILTER_ACTION_DENY)
+                               continue;
+               }
+               else

                {
                {

-                       // Compute new digest
-                       done = 0;
-                       MD5Init(&ctx);
-                       MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
-                       MD5Update(&ctx, &working_vector, 16);
-                       MD5Final(digest, &ctx);
+                       if (rule->frag)
+                               continue;
+
+                       if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
+                       {
+                               if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
+                                       continue;
+
+                               if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
+                                       continue;
+
+                               if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
+                                   !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
+                                       continue;
+                       }

                }
                }

+
+               // matched
+               rule->counter++;
+               return rule->action == FILTER_ACTION_PERMIT;

        }
 
        }
 

-       return hidden_length + 6;
+       // default deny
+       return 0;

 }
 }

-