X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/8512f6d9249a7190045a14066f952162ae67b0d3..447f8208990922d1743285dba0e3cb06fb03d9fc:/l2tpns.c?ds=inline diff --git a/l2tpns.c b/l2tpns.c index 8fc2167..4a91a3f 100644 --- a/l2tpns.c +++ b/l2tpns.c @@ -1,8 +1,11 @@ // L2TP Network Server // Adrian Kennard 2002 -// (c) Copyrigth 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) +// Copyright (c) 2003, 2004, 2005 Optus Internet Engineering +// 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 1.123 2005/08/12 08:35:16 bodea Exp $"; + #include #include #include @@ -16,24 +19,27 @@ #include #include #include -#include +#include #include #include #include -#define __USE_GNU #include +#include #include #include #include #include #include -#include #include #include #include #include #include #include +#include +#include +#include + #include "md5.h" #include "l2tpns.h" #include "cluster.h" @@ -42,68 +48,101 @@ #include "constants.h" #include "control.h" #include "util.h" +#include "tbf.h" + +#ifdef BGP +#include "bgp.h" +#endif // Globals -struct configt *config = NULL; // all configuration -int tapfd = -1; // tap interface file handle +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 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 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. -ipt myip = 0; // MY IP -u16 tapmac[3]; // MAC of tap interface -int tapidx; // ifr_ifindex of tap device -u32 sessionid = 0; // session id for radius accounting -int syslog_log = 0; // are we logging to syslog -FILE *log_stream = NULL; -struct sockaddr_in snoop_addr = {0}; -extern int cluster_sockfd; -unsigned long last_sid = 0; -int clifd = 0; -sessionidt *cli_session_kill = NULL; -tunnelidt *cli_tunnel_kill = NULL; -static void *ip_hash[256]; -unsigned long udp_tx = 0, udp_rx = 0, udp_rx_pkt = 0; -unsigned long eth_tx = 0, eth_rx = 0, eth_rx_pkt = 0; -unsigned int ip_pool_size = 0; -time_t time_now; -char time_now_string[64] = {0}; -char main_quit = 0; -char *_program_name = NULL; +static int tunidx; // ifr_ifindex of tun device +static int syslog_log = 0; // are we logging to syslog +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 + +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. +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 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. +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) -#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("random_device", random_device, 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("snoop_host", snoop_destination_host, IP), - CONFIG("snoop_port", snoop_destination_port, SHORT), - CONFIG("primary_radius", radiusserver[0], IP), - CONFIG("secondary_radius", radiusserver[1], IP), + 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("radius_interim", radius_interim, INT), CONFIG("radius_secret", radiussecret, STRING), - CONFIG("bind_address", bind_address, IP), - CONFIG("cluster_master", cluster_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("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("packet_limit", max_packets, INT), + CONFIG("cluster_address", cluster_address, IPv4), + CONFIG("cluster_interface", cluster_interface, STRING), + 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 }, }; -char *plugin_functions[] = { +static char *plugin_functions[] = { NULL, "plugin_pre_auth", "plugin_post_auth", @@ -114,51 +153,81 @@ char *plugin_functions[] = { "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 *)) -tunnelt *tunnel = NULL; // 1000 * 45 = 45000 = 45k -sessiont *session = NULL; // 5000 * 213 = 1065000 = 1 Mb -radiust *radius = NULL; -ippoolt *ip_address_pool = NULL; -controlt *controlfree = 0; +// 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. +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. +ip_filtert *ip_filters = NULL; // Array of named filters. +static controlt *controlfree = 0; struct Tstats *_statistics = NULL; #ifdef RINGBUFFER struct Tringbuffer *ringbuffer = NULL; #endif -tbft *filter_buckets = NULL; - -void sigalrm_handler(int); -void sighup_handler(int); -void sigterm_handler(int); -void sigquit_handler(int); -void sigchild_handler(int); -void read_config_file(); -void read_state(); -void dump_state(); -void tunnel_clean(); -tunnelidt new_tunnel(); -void update_config(); - -// return internal time (10ths since run) -clockt now(void) + +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 dump_acct_info(int all); +static void sighup_handler(int sig); +static void sigalrm_handler(int sig); +static void shutdown_handler(int sig); +static void sigchild_handler(int sig); +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 processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen); +static tunnelidt new_tunnel(void); +static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len); + +// 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); + 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 -clockt backoff(u8 try) +// This is a straight bounded exponential backoff. +// Maximum re-try time is 32 seconds. (2^5). +clockt backoff(uint8_t try) { if (try > 5) try = 5; // max backoff - return now() + 10 * (1 << try); + return now(NULL) + 10 * (1 << try); } -void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...) + +// +// Log a debug message. Typically called via the LOG macro +// +void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) { - static char message[65535] = {0}; - static char message2[65535] = {0}; + static char message[65536] = {0}; va_list ap; #ifdef RINGBUFFER @@ -171,7 +240,6 @@ void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, 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); @@ -183,32 +251,27 @@ void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, if (config->debug < level) return; va_start(ap, format); + vsnprintf(message, sizeof(message), format, ap); + if (log_stream) - { - vsnprintf(message2, 65535, format, ap); - snprintf(message, 65535, "%s %02d/%02d %s", time_now_string, t, s, message2); - fprintf(log_stream, message); - } + fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message); 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); } -void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, 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; - unsigned const char *d = (unsigned const char *)data; + const uint8_t *d = data; if (config->debug < level) return; - // No support for log_hex to syslog + // No support for _log_hex to syslog if (log_stream) { - log(level, address, s, t, "%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; ) @@ -249,53 +312,216 @@ void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *tit } } +// 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 -void routeset(ipt ip, ipt mask, ipt gw, u8 add) +// +// This adds it to the routing table, advertises it +// via BGP if enabled, and stuffs it into the +// 'sessionbyip' cache. +// +// 'ip' and 'mask' must be in _host_ order. +// +static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, int add) { struct rtentry r; + int i; + + if (!mask) mask = 0xffffffff; + + ip &= mask; // Force the ip to be the first one in the route. + memset(&r, 0, sizeof(r)); - r.rt_dev = config->tapdevice; + 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; - *(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; - *(u32 *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask ? mask : 0xFFFFFFF); + *(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 + else if (mask == 0xffffffff) r.rt_flags |= RTF_HOST; - if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0) perror("routeset"); - 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 & 255, ip >> 8 & 255, ip & 255, mask >> 24, mask >> 16 & 255, mask >> 8 & 255, mask & 255, gw >> 24, gw >> 16 & 255, gw >> 8 & 255, gw & 255); + + 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) + LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno)); + +#ifdef BGP + if (add) + bgp_add_route(htonl(ip), htonl(mask)); + else + bgp_del_route(htonl(ip), htonl(mask)); +#endif /* BGP */ + + // Add/Remove the IPs to the 'sessionbyip' cache. + // Note that we add the zero address in the case of + // a network route. Roll on CIDR. + + // Note that 's == 0' implies this is the address pool. + // We still cache it here, because it will pre-fill + // the malloc'ed tree. + + if (s) + { + if (!add) // Are we deleting a route? + s = 0; // Caching the session as '0' is the same as uncaching. + + for (i = ip; (i&mask) == (ip&mask) ; ++i) + cache_ipmap(i, s); + } +} + +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; } -// Set up TAP interface -void inittap(void) +// 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; + struct in6_ifreq ifr6; struct sockaddr_in sin = {0}; memset(&ifr, 0, sizeof(ifr)); ifr.ifr_flags = IFF_TUN; - tapfd = open(TAPDEVICE, O_RDWR); - if (tapfd < 0) + tunfd = open(TUNDEVICE, O_RDWR); + if (tunfd < 0) { // fatal - log(0, 0, 0, 0, "Can't open %s: %s\n", TAPDEVICE, strerror(errno)); - exit(-1); + LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno)); + exit(1); } { - int flags = fcntl(tapfd, F_GETFL, 0); - fcntl(tapfd, F_SETFL, flags | O_NONBLOCK); + int flags = fcntl(tunfd, F_GETFL, 0); + fcntl(tunfd, F_SETFL, flags | O_NONBLOCK); } - if (ioctl(tapfd, TUNSETIFF, (void *) &ifr) < 0) + if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0) { - log(0, 0, 0, 0, "Can't set tap interface: %s\n", strerror(errno)); - exit(-1); + LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno)); + exit(1); } - assert(strlen(ifr.ifr_name) < sizeof(config->tapdevice)); - strncpy(config->tapdevice, ifr.ifr_name, sizeof(config->tapdevice) - 1); + assert(strlen(ifr.ifr_name) < sizeof(config->tundevice)); + strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1); ifrfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); sin.sin_family = AF_INET; @@ -304,38 +530,62 @@ void inittap(void) if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0) { - perror("set tap addr"); - exit( -1); + 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) { - perror("set tap qlen"); - exit( -1); + 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) { - perror("set tap flags"); - exit( -1); - } - if (ioctl(ifrfd, SIOCGIFHWADDR, (void *) &ifr) < 0) - { - perror("get tap hwaddr"); - exit( -1); + LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno)); + exit(1); } - memcpy(&tapmac, 2 + (u8 *) & ifr.ifr_hwaddr, 6); if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0) { - perror("get tap ifindex"); - exit( -1); + LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno)); + 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)); + } } - tapidx = ifr.ifr_ifindex; } -// set up UDP port -void initudp(void) +// set up UDP ports +static void initudp(void) { int on = 1; struct sockaddr_in addr; @@ -345,7 +595,7 @@ void initudp(void) addr.sin_family = AF_INET; addr.sin_port = htons(L2TPPORT); addr.sin_addr.s_addr = config->bind_address; - udpfd = socket(AF_INET, SOCK_DGRAM, UDP); + udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); { int flags = fcntl(udpfd, F_GETFL, 0); @@ -353,119 +603,293 @@ void initudp(void) } if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0) { - perror("udp bind"); - exit( -1); + LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno)); + exit(1); } - snoopfd = socket(AF_INET, SOCK_DGRAM, UDP); // Control memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; - addr.sin_port = htons(1702); - controlfd = socket(AF_INET, SOCK_DGRAM, 17); + addr.sin_port = htons(NSCTL_PORT); + controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0) { - perror("bind"); - exit(-1); + 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); } + + // Intercept + snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); } -// Find session by IP, 0 for not found -sessionidt sessionbyip(ipt ip) +// +// Find session by IP, < 1 for not found +// +// Confusingly enough, this 'ip' must be +// in _network_ order. This being the common +// case when looking it up from IP packet headers. +// +// We actually use this cache for two things. +// #1. For used IP addresses, this maps to the +// session ID that it's used by. +// #2. For un-used IP addresses, this maps to the +// index into the pool table that contains that +// IP address. +// + +static int lookup_ipmap(in_addr_t ip) { - unsigned char *a = (unsigned char *)&ip; - char **d = (char **) ip_hash; - sessionidt s; + uint8_t *a = (uint8_t *) &ip; + uint8_t **d = (uint8_t **) ip_hash; -#ifdef STAT_CALLS - STAT(call_sessionbyip); -#endif + 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) +{ + struct ipv6radix *curnode; + int i; + 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++; + } + + LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n", + inet_ntop(AF_INET6, &ip, ipv6addr, + INET6_ADDRSTRLEN), + s); + + return s; +} + +sessionidt sessionbyip(in_addr_t ip) +{ + int s = lookup_ipmap(ip); + CSTAT(sessionbyip); + + if (s > 0 && s < MAXSESSION && session[s].opened) + return (sessionidt) s; - 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; + 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); + } - s = (ipt) d[(size_t) *a]; - if (s && session[s].tunnel) + if (s > 0 && s < MAXSESSION && session[s].opened) return s; + return 0; } -void cache_sessionid(ipt ip, sessionidt s) +// +// Take an IP address in HOST byte order and +// add it to the sessionid by IP cache. +// +// (It's actually cached in network order) +// +static void cache_ipmap(in_addr_t ip, int s) { - unsigned char *a = (unsigned char *) &ip; - 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]]) { - if (!(d[(size_t) a[i]] = calloc(256, sizeof (void *)))) + if (!(d[(size_t) a[i]] = calloc(256, sizeof(void *)))) return; } - d = (char **) d[(size_t) a[i]]; + d = (uint8_t **) d[(size_t) a[i]]; } - log(4, ip, s, session[s].tunnel, "Caching session ID %d for ip address\n", s); - d[(size_t) a[3]] = (char *)((int)s); + d[(size_t) a[3]] = (uint8_t *) (intptr_t) s; + + if (s > 0) + LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0)); + + else if (s == 0) + LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0)); + // else a map to an ip pool index. +} + +static void uncache_ipmap(in_addr_t ip) +{ + cache_ipmap(ip, 0); // Assign it to the NULL session. } -void uncache_sessionid(ipt ip) +static void cache_ipv6map(struct in6_addr ip, int prefixlen, int s) { - unsigned char *a = (unsigned char *) &ip; - char **d = (char **) ip_hash; int i; + int bytes; + struct ipv6radix *curnode; + char ipv6addr[INET6_ADDRSTRLEN]; - for (i = 0; i < 3; i++) + 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. +// +int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc) +{ + char **d = (char **) ip_hash, **e, **f, **g; + int i, j, k, l; + int count = 0; + + if (CLI_HELP_REQUESTED) + return CLI_HELP_NO_ARGS; + + cli_print(cli, "%7s %s", "Sess#", "IP Address"); + + for (i = 0; i < 256; ++i) { - if (!d[(size_t) a[i]]) return; - d = (char **) d[(size_t) a[i]]; + if (!d[i]) + continue; + e = (char **) d[i]; + for (j = 0; j < 256; ++j) + { + if (!e[j]) + continue; + f = (char **) e[j]; + for (k = 0; k < 256; ++k) + { + if (!f[k]) + continue; + g = (char **)f[k]; + for (l = 0; l < 256; ++l) + { + if (!g[l]) + continue; + cli_print(cli, "%7d %d.%d.%d.%d", (int) (intptr_t) g[l], i, j, k, l); + ++count; + } + } + } } - d[(size_t) a[3]] = NULL; + cli_print(cli, "%d entries in cache", count); + return CLI_OK; } + // Find session by username, 0 for not found // walled garden users aren't authenticated, so the username is // reasonably useless. Ignore them to avoid incorrect actions +// +// This is VERY inefficent. Don't call it often. :) +// sessionidt sessionbyuser(char *username) { int s; -#ifdef STAT_CALLS - STAT(call_sessionbyuser); -#endif - for (s = 1; s < MAXSESSION && (session[s].walled_garden || strncmp(session[s].user, username, 128)); s++); - if (s < MAXSESSION) - return s; - return 0; + CSTAT(sessionbyuser); + + 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 (!strncmp(session[s].user, username, 128)) + return s; + + } + return 0; // Not found. } -void send_garp(ipt ip) +void send_garp(in_addr_t ip) { int s; struct ifreq ifr; - unsigned char mac[6]; + uint8_t mac[6]; 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) { - 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) { - 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; } @@ -473,123 +897,30 @@ void send_garp(ipt ip) sendarp(ifr.ifr_ifindex, mac, ip); } -// Find session by username, 0 for not found -sessiont *sessiontbysessionidt(sessionidt s) +static sessiont *sessiontbysessionidt(sessionidt s) { - if (!s || s > MAXSESSION) return NULL; + if (!s || s >= MAXSESSION) return NULL; return &session[s]; } -sessionidt sessionidtbysessiont(sessiont *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; } -// send gratuitous ARP to set ARP table for newly allocated IP -void sessionsendarp(sessionidt s) -{ - unsigned char mac[6]; -#ifdef STAT_CALLS - STAT(call_sendarp); -#endif - *(u16 *) (mac + 0) = htons(tapmac[0]); // set source address - *(u16 *) (mac + 2) = htons(tapmac[1]); - *(u16 *) (mac + 4) = htons(tapmac[2]); - sendarp(tapidx, mac, session[s].ip); - STAT(arp_sent); -} - -// Handle ARP requests -void processarp(u8 * buf, int len) -{ - ipt ip; - sessionidt s; - -#ifdef STAT_CALLS - STAT(call_processarp); -#endif - STAT(arp_recv); - if (len != 46) - { - log(0, 0, 0, 0, "Unexpected length ARP %d bytes\n", len); - STAT(arp_errors); - return; - } - if (*(u16 *) (buf + 16) != htons(PKTARP)) - { - log(0, 0, 0, 0, "Unexpected ARP type %04X\n", ntohs(*(u16 *) (buf + 16))); - STAT(arp_errors); - return; - } - if (*(u16 *) (buf + 18) != htons(0x0001)) - { - log(0, 0, 0, 0, "Unexpected ARP hard type %04X\n", ntohs(*(u16 *) (buf + 18))); - STAT(arp_errors); - return; - } - if (*(u16 *) (buf + 20) != htons(PKTIP)) - { - log(0, 0, 0, 0, "Unexpected ARP prot type %04X\n", ntohs(*(u16 *) (buf + 20))); - STAT(arp_errors); - return; - } - if (buf[22] != 6) - { - log(0, 0, 0, 0, "Unexpected ARP hard len %d\n", buf[22]); - STAT(arp_errors); - return; - } - if (buf[23] != 4) - { - log(0, 0, 0, 0, "Unexpected ARP prot len %d\n", buf[23]); - STAT(arp_errors); - return; - } - if (*(u16 *) (buf + 24) != htons(0x0001)) - { - log(0, 0, 0, 0, "Unexpected ARP op %04X\n", ntohs(*(u16 *) (buf + 24))); - STAT(arp_errors); - return; - } - ip = ntohl(*(u32 *) (buf + 42)); - // look up session - s = sessionbyip(htonl(ip)); - if (s) - { - log(3, ip, s, session[s].tunnel, "ARP reply for %u.%u.%u.%u\n", ip >> 24, ip >> 16 & 255, ip >> 8 & 255, ip & 255); - memcpy(buf + 4, buf + 10, 6); // set destination as source - *(u16 *) (buf + 10) = htons(tapmac[0]); // set soucre address - *(u16 *) (buf + 12) = htons(tapmac[1]); - *(u16 *) (buf + 14) = htons(tapmac[2]); - *(u16 *) (buf + 24) = htons(0x0002); // ARP reply - memcpy(buf + 26, buf + 10, 6); // sender ethernet - memcpy(buf + 36, buf + 4, 6); // target ethernet - *(u32 *) (buf + 42) = *(u32 *) (buf + 32); // target IP - *(u32 *) (buf + 32) = htonl(ip); // sender IP - write(tapfd, buf, len); - STAT(arp_replies); - } - else - { - log(3, ip, 0, 0, "ARP request for unknown IP %u.%u.%u.%u\n", ip >> 24, ip >> 16 & 255, ip >> 8 & 255, ip & 255); - STAT(arp_discarded); - } -} - // 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; -#ifdef STAT_CALLS - STAT(call_tunnelsend); -#endif + CSTAT(tunnelsend); + 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; @@ -598,18 +929,19 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t) 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; } + 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 - 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) @@ -619,38 +951,58 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t) 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) { - 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; } - log_hex(5, "Send Tunnel Data", buf, l); + LOG_HEX(5, "Send Tunnel Data", buf, l); STAT(tunnel_tx_packets); INC_STAT(tunnel_tx_bytes, l); } +// +// Tiny helper function to write data to +// the 'tun' device. +// +int tun_write(uint8_t * data, int size) +{ + return write(tunfd, data, size); +} + // process outgoing (to tunnel) IP -void processipout(u8 * buf, int len) +// +static void processipout(uint8_t *buf, int len) { sessionidt s; sessiont *sp; tunnelidt t; - ipt ip; - u8 b[MAXETHER]; -#ifdef STAT_CALLS - STAT(call_processipout); -#endif + in_addr_t ip; + + uint8_t *data = buf; // Keep a copy of the originals. + int size = len; + + uint8_t b[MAXETHER + 20]; + + CSTAT(processipout); + 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) + { + LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len); + STAT(tun_rx_errors); return; } @@ -659,84 +1011,326 @@ void processipout(u8 * buf, int len) 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; } - ip = *(u32 *)(buf + 16); + ip = *(uint32_t *)(buf + 16); if (!(s = sessionbyip(ip))) { - 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); + // 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) + { + last = time_now; + rate = 0; + } + + if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second. + { + 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]; - // Snooping this session, send it to ASIO - if (sp->snoop) snoop_send_packet(buf, len); + // 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; + + 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, 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 { - u8 *p = makeppp(b, buf, len, t, s, PPPIP); + uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP); + if (!p) return; tunnelsend(b, len + (p-b), t); // send it... - sp->cout += len; // byte count - sp->total_cout += len; // byte count - sp->pout++; - udp_tx += len; } -} -// add an AVP (16 bit) -void control16(controlt * c, u16 avp, u16 val, u8 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); - c->length += 8; + // 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++; } -// add an AVP (32 bit) -void control32(controlt * c, u16 avp, u32 val, u8 m) +// process outgoing (to tunnel) IPv6 +// +static void processipv6out(uint8_t * buf, int len) { - 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); - c->length += 10; + 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) + { + 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... + } + + // 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++; +} + +// +// Helper routine for the TBF filters. +// Used to send queued data in to the user! +// +static void send_ipout(sessionidt s, uint8_t *buf, int len) +{ + sessiont *sp; + tunnelidt t; + in_addr_t ip; + + uint8_t b[MAXETHER + 20]; + + if (len < 0 || len > MAXETHER) + { + LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len); + return; + } + + // Skip the tun header + buf += 4; + len -= 4; + + ip = *(in_addr_t *)(buf + 16); + + if (!session[s].ip) + return; + + t = session[s].tunnel; + sp = &session[s]; + + 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, PPPIP); + if (!p) return; + tunnelsend(b, len + (p-b), t); // send it... + } + + // Snooping this session. + 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++; +} + +// add an AVP (16 bit) +static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m) +{ + 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) -void controls(controlt * c, u16 avp, char *val, u8 m) +static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m) +{ + 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; +} + +// 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 -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 -controlt *controlnew(u16 mtype) +static controlt *controlnew(uint16_t mtype) { controlt *c; if (!controlfree) @@ -748,42 +1342,46 @@ controlt *controlnew(u16 mtype) } 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; } // send zero block if nothing is waiting -void controlnull(tunnelidt t) +// (ZLB send). +static void controlnull(tunnelidt t) { - u8 buf[12]; - if (tunnel[t].controlc) + uint8_t buf[12]; + 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 -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].controle = c; tunnel[t].controlc++; + // send now if space in window if (tunnel[t].controlc <= tunnel[t].window) { @@ -792,134 +1390,298 @@ void controladd(controlt * c, tunnelidt t, sessionidt s) } } +// +// Throttle or Unthrottle a session +// +// Throttle the data from/to through a session to no more than +// 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to +// user). +// +// If either value is -1, the current value is retained for that +// direction. +// +void throttle_session(sessionidt s, int rate_in, int rate_out) +{ + if (!session[s].opened) + return; // No-one home. + + if (!*session[s].user) + return; // User not logged in + + if (rate_in >= 0) + { + int bytes = rate_in * 1024 / 8; // kbits to bytes + if (session[s].tbf_in) + free_tbf(session[s].tbf_in); + + if (rate_in > 0) + session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin); + else + session[s].tbf_in = 0; + + session[s].throttle_in = rate_in; + } + + if (rate_out >= 0) + { + int bytes = rate_out * 1024 / 8; + if (session[s].tbf_out) + free_tbf(session[s].tbf_out); + + if (rate_out > 0) + session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout); + else + session[s].tbf_out = 0; + + session[s].throttle_out = 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 -void sessionshutdown(sessionidt s, char *reason) +void sessionshutdown(sessionidt s, char *reason, int result, int error) { - int dead = session[s].die; int walled_garden = session[s].walled_garden; -#ifdef STAT_CALLS - STAT(call_sessionshutdown); -#endif - if (!session[s].tunnel) + + CSTAT(sessionshutdown); + + 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) - log(2, 0, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason); - - session[s].die = now() + 150; // Clean up in 15 seconds - { struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] }; + LOG(2, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason); run_plugins(PLUGIN_KILL_SESSION, &data); } - // RADIUS Stop message - if (session[s].opened && !walled_garden && !dead) { - u16 r = session[s].radius; - if (!r) + if (session[s].ip && !walled_garden && !session[s].die) + { + // 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 - u16 r; - if (session[s].route[0].ip) + int r; + int routed = 0; + for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++) { - routeset(session[s].ip, 0, 0, 0); - for (r = 0; r < MAXROUTE; r++) - { - if (session[s].route[r].ip) - { - routeset(session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 0); - session[s].route[r].ip = 0; - } - } + 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 + { + if (!routed) routeset(s, session[s].ip, 0, 0, 0); + session[s].ip = 0; } - if (session[s].throttle) throttle_session(s, 0); session[s].throttle = 0; - free_ip_address(s); + 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 (result) { // 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) - controladd(c, session[s].tunnel, s); // send the message + controladd(c, session[s].far, session[s].tunnel); // send the message } + + if (!session[s].die) + 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); } -void sendipcp(tunnelidt t, sessionidt s) +void sendipcp(sessionidt s, tunnelidt t) { - u8 buf[MAXCONTROL]; - u16 r = session[s].radius; - u8 *q; -#ifdef STAT_CALLS - STAT(call_sendipcp); -#endif - if (!r) - r = radiusnew(s); - if (radius[r].state != RADIUSIPCP) - { - radius[r].state = RADIUSIPCP; - radius[r].try = 0; - } - radius[r].retry = backoff(radius[r].try++); - if (radius[r].try > 10) + uint8_t buf[MAXCONTROL]; + uint8_t *q; + + CSTAT(sendipcp); + LOG(3, s, t, "IPCP: send ConfigReq\n"); + + if (!session[s].unique_id) { - sessionshutdown(s, "No reply on IPCP"); - return; + if (!++last_id) ++last_id; // skip zero + session[s].unique_id = last_id; } - q = makeppp(buf, 0, 0, t, s, PPPIPCP); + + q = makeppp(buf,sizeof(buf), 0, 0, s, t, PPPIPCP); + if (!q) return; + *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) = htonl(myip ? myip : session[s].ip); // send my IP (use theirs if I dont have one) + 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 } -// kill a session now -void sessionkill(sessionidt s, char *reason) +void sendipv6cp(sessionidt s, tunnelidt t) +{ + uint8_t buf[MAXCONTROL]; + uint8_t *q; + + CSTAT(sendipv6cp); + LOG(3, s, t, "IPV6CP: send ConfigReq\n"); + + q = makeppp(buf,sizeof(buf), 0, 0, s, t, PPPIPV6CP); + if (!q) return; + + *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) { -#ifdef STAT_CALLS - STAT(call_sessionkill); -#endif - sessionshutdown(s, reason); // close radius/routes, etc. - if (session[s].radius) - radiusclear(session[s].radius, 0); // cant send clean accounting data, session is killed - log(2, 0, s, session[s].tunnel, "Kill session %d: %s\n", s, reason); 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; +} + +// 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); } +static void tunnelclear(tunnelidt t) +{ + if (!t) return; + memset(&tunnel[t], 0, sizeof(tunnel[t])); + tunnel[t].state = TUNNELFREE; +} + // kill a tunnel now -void tunnelkill(tunnelidt t, char *reason) +static void tunnelkill(tunnelidt t, char *reason) { sessionidt s; controlt *c; -#ifdef STAT_CALLS - STAT(call_tunnelkill); -#endif + + CSTAT(tunnelkill); tunnel[t].state = TUNNELDIE; @@ -933,159 +1695,222 @@ void tunnelkill(tunnelidt t, char *reason) 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); + LOG(1, 0, t, "Kill tunnel %d: %s\n", t, reason); + cli_tunnel_actions[t].action = 0; cluster_send_tunnel(t); - log(1, 0, 0, t, "Kill tunnel %d: %s\n", t, reason); - tunnel[t].die = 0; - tunnel[t].state = TUNNELFREE; } // shut down a tunnel cleanly -void tunnelshutdown(tunnelidt t, char *reason) +static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg) { sessionidt s; -#ifdef STAT_CALLS - STAT(call_tunnelshutdown); -#endif + + CSTAT(tunnelshutdown); + if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE) { // never set up, can immediately kill 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 - for (s = 1; s < MAXSESSION; s++) + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) if (session[s].tunnel == t) - sessionkill(s, reason); + sessionshutdown(s, reason, 0, 0); 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? - { // 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) -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(processudp); -#ifdef STAT_CALLS - STAT(call_processudp); -#endif udp_rx += len; udp_rx_pkt++; - log_hex(5, "UDP Data", buf, len); + LOG_HEX(5, "UDP Data", buf, len); STAT(tunnel_rx_packets); 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) { - 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 - l = ntohs(*(u16 *) p); + l = ntohs(*(uint16_t *) p); p += 2; } - t = ntohs(*(u16 *) p); + t = ntohs(*(uint16_t *) p); p += 2; - s = ntohs(*(u16 *) p); + s = ntohs(*(uint16_t *) p); 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) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Received UDP packet with invalid tunnel ID\n"); - STAT(tunnel_rx_errors); - return; - } - if (s && !session[s].tunnel) - { - 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, "Received UDP packet with invalid tunnel ID\n"); STAT(tunnel_rx_errors); return; } if (*buf & 0x08) { // ns/nr - ns = ntohs(*(u16 *) p); + ns = ntohs(*(uint16_t *) p); p += 2; - nr = ntohs(*(u16 *) p); + nr = ntohs(*(uint16_t *) p); 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) { - 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); 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 - if ((*buf & 0xCA) != 0xC8) - { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Bad control header %02X\n", *buf); + 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) + { + master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); + return; + } + + // 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, s, t, "Bad control header %02X\n", *buf); STAT(tunnel_rx_errors); return; } - log(3, ntohl(addr->sin_addr.s_addr), s, t, "Control message (%d bytes): %d ns %d nr %d ns %d nr %d\n", - l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr); + + // check for duplicate tunnel open message + if (!t && ns == 0) + { + int i; + + // + // Is this a duplicate of the first packet? (SCCRQ) + // + for (i = 1; i <= config->cluster_highest_tunnelid ; ++i) + { + if (tunnel[i].state != TUNNELOPENING || + tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) || + tunnel[i].port != ntohs(addr->sin_port) ) + continue; + t = i; + LOG(3, s, t, "Duplicate SCCRQ?\n"); + 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())) { - 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); - 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 - 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); + LOG(1, 0, t, " New tunnel from %s:%u ID %d\n", + fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t); + } + + // 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; } // This is used to time out old tunnels @@ -1094,29 +1919,20 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // check sequence of this message { int skip = tunnel[t].window; // track how many in-window packets are still in queue - if (tunnel[t].controlc) - { // some to clear maybe - while (tunnel[t].controlc && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000)) - { - controlt *c = tunnel[t].controls; - tunnel[t].controls = c->next; - tunnel[t].controlc--; - c->next = controlfree; - controlfree = c; - skip--; - tunnel[t].try = 0; // we have progress - } - } - if (tunnel[t].nr < ns && tunnel[t].nr != 0) + // some to clear maybe? + while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000)) { - // is this the sequence we were expecting? - log(1, ntohl(addr->sin_addr.s_addr), 0, t, " Out of sequence tunnel %d, (%d not %d)\n", t, ns, tunnel[t].nr); - STAT(tunnel_rx_errors); -// controlnull(t); - return; + controlt *c = tunnel[t].controls; + tunnel[t].controls = c->next; + tunnel[t].controlc--; + c->next = controlfree; + controlfree = c; + skip--; + tunnel[t].try = 0; // we have progress } + // receiver advance (do here so quoted correctly in any sends below) - if (l) tunnel[t].nr++; + if (l) tunnel[t].nr = (ns + 1); if (skip < 0) skip = 0; if (skip < tunnel[t].controlc) { @@ -1141,308 +1957,339 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } if (l) { // if not a null message + int result = 0; + int error = 0; + char *msg = 0; + // 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); - fatal = flags; return; } + p += n; // next 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) { + uint16_t orig_len; + // handle hidden AVPs if (!*config->l2tpsecret) { - 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; + result = 2; // general error + error = 6; // generic vendor-specific error + msg = "secret not specified"; 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; + result = 2; // general error + error = 6; // generic + msg = "no random vector"; continue; } - log(4, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP\n"); - } - 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 + 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_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; + result = 2; // general error + error = 2; // length is wrong + msg = 0; + continue; + } + + b += 2; + n = orig_len; } - 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 - 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 { - u16 rescode = ntohs(*(u16 *)(b)); + uint16_t rescode = ntohs(*(uint16_t *) b); const char* resdesc = "(unknown)"; - if (message == 4) { /* StopCCN */ - if (rescode <= MAX_STOPCCN_RESULT_CODE) - resdesc = stopccn_result_codes[rescode]; - } else if (message == 14) { /* CDN */ - if (rescode <= MAX_CDN_RESULT_CODE) - resdesc = cdn_result_codes[rescode]; + if (message == 4) + { /* StopCCN */ + resdesc = l2tp_stopccn_result_code(rescode); } - - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Result Code %d: %s\n", - rescode, resdesc); - 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); + else if (message == 14) + { /* CDN */ + resdesc = l2tp_cdn_result_code(rescode); } - if (n > 4) { - /* %*s doesn't work?? */ - char *buf = (char *)strndup(b+4, n-4); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error String: %s\n", - buf); - free(buf); + + LOG(4, s, t, " Result Code %d: %s\n", rescode, resdesc); + if (n >= 4) + { + 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) + LOG(4, s, t, " Error String: %.*s\n", n-4, b+4); + 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 - 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; + result = 5; // unspported protocol version + error = 0x0100; // supported version + msg = 0; 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 -// 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 -// 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 -// 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 - 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, 128); - memcpy(tunnel[t].vendor, b, (n >= 127) ? 127 : n); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor); + memset(tunnel[t].vendor, 0, sizeof(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 - 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 - 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 - 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 { - 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. + LOG(2, s, t, " received unexpected challenge response\n"); + 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 - 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 - 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 - 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 - 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 - 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) { - 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 - 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); } - log(4, ntohl(addr->sin_addr.s_addr), s, t, " TX connect speed <%lu>\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) { - 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 - 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); } - log(4, ntohl(addr->sin_addr.s_addr), s, t, " RX connect speed <%lu>\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 { - 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 { - 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 { - 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 { - 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 { - 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 - { - 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 - u8 *p = b, *e = p + n; - while (p < e && p[1]) + uint8_t *p = b, *e = p + n; + while (p + 1 < e && p[1] && p + p[1] <= e) { - if (*p == 5 && p[1] == 6) - amagic = ntohl(*(u32 *) (p + 2)); - else if (*p == 3 && p[1] == 5 && *(u16 *) (p + 2) == htons(PPPCHAP) && p[4] == 5) - chap = 1; - else if (*p == 7) + if (*p == 5 && p[1] == 6) // Magic-Number + amagic = ntohl(*(uint32_t *) (p + 2)); + else if (*p == 7) // Protocol-Field-Compression aflags |= SESSIONPFC; - else if (*p == 8) + else if (*p == 8) // Address-and-Control-Field-Compression aflags |= SESSIONACFC; p += p[1]; } - - { - char tmp[500] = {0}; - tmp[0] = ConfigReq; - memcpy((tmp + 1), b, n); - } } break; case 28: // last recv lcp confreq - { - char tmp[500] = {0}; - tmp[0] = ConfigReq; - memcpy((tmp + 1), b, n); - break; - } + break; case 26: // Initial Received LCP CONFREQ - { - char tmp[500] = {0}; - tmp[0] = ConfigReq; - memcpy((tmp + 1), b, n); - } break; 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)); + 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: - 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) - tunnelshutdown(t, "Unknown Mandatory AVP"); + tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg); 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 @@ -1450,9 +2297,12 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) controls(c, 7, tunnel[t].hostname, 1); // host name (TBA) 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; @@ -1463,8 +2313,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) 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 @@ -1479,73 +2328,80 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // 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; memset(&session[s], 0, sizeof(session[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"); - return; - } + if (s > config->cluster_highest_sessionid) + config->cluster_highest_sessionid = s; - 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; - 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 - 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); + + session[s].ppp.phase = Establish; + session[s].ppp.lcp = Starting; + 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 12: // ICCN + if (amagic == 0) amagic = time_now; session[s].magic = amagic; // set magic number - session[s].flags = aflags; // set flags received - log(3, ntohl(addr->sin_addr.s_addr), s, t, "Magic %X Flags %X\n", amagic, aflags); + session[s].l2tp_flags = aflags; // set flags received controlnull(t); // ack - // In CHAP state, request PAP instead - if (requestchap) - initlcp(t, s); + + // start LCP + sendlcp(s, t, config->radius_authprefer); + 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; + session[s].ppp.lcp = RequestSent; + break; case 14: // CDN controlnull(t); // ack - sessionshutdown(s, "Closed (Received CDN)"); + sessionshutdown(s, "Closed (Received CDN).", 0, 0); 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); - if (mandatorymessage & 0x80) - tunnelshutdown(t, "Unknown message"); + if (mandatory) + tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type"); 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); @@ -1553,19 +2409,14 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } else { - log(4, 0, s, t, " Got a ZLB ack\n"); + LOG(4, s, t, " Got a ZLB ack\n"); } } else { // data - u16 prot; + uint16_t prot; - log_hex(5, "Receive Tunnel Data", p, l); - if (session[s].die) - { - log(3, ntohl(addr->sin_addr.s_addr), s, t, "Session %d is closing. Don't process PPP packets\n", s); - return; // closing session, PPP not processed - } + LOG_HEX(5, "Receive Tunnel Data", p, l); if (l > 2 && p[0] == 0xFF && p[1] == 0x03) { // HDLC address header, discard p += 2; @@ -1573,7 +2424,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } 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; } @@ -1584,1434 +2435,2852 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } else { - prot = ntohs(*(u16 *) p); + prot = ntohs(*(uint16_t *) p); p += 2; l -= 2; } + + if (s && !session[s].opened) // Is something wrong?? + { + if (!config->cluster_iam_master) + { + // Pass it off to the master to deal with.. + master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); + return; + } + + + LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n"); + STAT(tunnel_rx_errors); + return; + } + if (prot == PPPPAP) { session[s].last_packet = time_now; - processpap(t, s, p, l); + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } + processpap(s, t, p, l); } else if (prot == PPPCHAP) { session[s].last_packet = time_now; - processchap(t, s, p, l); + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } + processchap(s, t, p, l); } else if (prot == PPPLCP) { session[s].last_packet = time_now; - processlcp(t, s, p, l); + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } + processlcp(s, t, p, l); } else if (prot == PPPIPCP) { session[s].last_packet = time_now; - processipcp(t, s, p, l); + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } + processipcp(s, t, p, l); + } + else if (prot == PPPIPV6CP) + { + 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; } + processipv6cp(s, t, p, l); } else if (prot == PPPCCP) { session[s].last_packet = time_now; - processccp(t, s, p, l); + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } + processccp(s, t, p, l); } else if (prot == 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 == PPPIPV6) + { + if (!config->ipv6_prefix.s6_addr[0]) + { + LOG(1, s, t, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n"); + return; + } + 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; - processipin(t, s, p, l); + if (session[s].walled_garden && !config->cluster_iam_master) + { + master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); + return; + } + + processipv6in(s, t, p, l); } else { STAT(tunnel_rx_errors); - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Unknown PPP protocol %04X\n", prot); + LOG(1, s, t, "Unknown PPP protocol %04X\n", prot); } } } -// read and process packet on tap -void processtap(u8 * buf, int len) +// read and process packet on tun +static void processtun(uint8_t * buf, int len) { - log_hex(5, "Receive TAP Data", buf, len); - STAT(tap_rx_packets); - INC_STAT(tap_rx_bytes, len); -#ifdef STAT_CALLS - STAT(call_processtap); -#endif + LOG_HEX(5, "Receive TUN Data", buf, len); + STAT(tun_rx_packets); + INC_STAT(tun_rx_bytes, len); + + CSTAT(processtun); + eth_rx_pkt++; eth_rx += len; if (len < 22) { - log(1, 0, 0, 0, "Short tap packet %d bytes\n", len); - STAT(tap_rx_errors); + LOG(1, 0, 0, "Short tun packet %d bytes\n", len); + STAT(tun_rx_errors); return; } - if (*(u16 *) (buf + 2) == htons(PKTARP)) // ARP - processarp(buf, len); - else if (*(u16 *) (buf + 2) == htons(PKTIP)) // IP + + if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4 processipout(buf, len); + else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6 + && config->ipv6_prefix.s6_addr[0]) + processipv6out(buf, len); + + // Else discard. } -// main loop - gets packets on tap or udp and processes them -void mainloop(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) { - fd_set cr; - int cn, i; - u8 buf[65536]; - struct timeval to; + // 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; + + // 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; - clockt slow = now(); // occasional functions like session/tunnel expiry, tunnel hello, etc - clockt next_acct = slow + ACCT_TIME; - clockt next_cluster_ping = slow + 50; - clockt next_clean = time_now + config->cleanup_interval; - to.tv_sec = 1; - to.tv_usec = 0; - log(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tapfd=%d, cluster_sockfd=%d, controlfd=%d\n", - udpfd, tapfd, cluster_sockfd, controlfd); + if (t_slice < 1) + t_slice = 1; + else if (t_slice > config->cluster_highest_tunnelid) + t_slice = config->cluster_highest_tunnelid; - FD_ZERO(&cr); - FD_SET(udpfd, &cr); - FD_SET(tapfd, &cr); - FD_SET(controlfd, &cr); - FD_SET(clifd, &cr); - if (cluster_sockfd) FD_SET(cluster_sockfd, &cr); - cn = udpfd; - if (cn < tapfd) cn = tapfd; - if (cn < controlfd) cn = controlfd; - if (cn < clifd) cn = clifd; - if (cn < cluster_sockfd) cn = cluster_sockfd; - for (i = 0; i < config->num_radfds; i++) + 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++) { - if (!radfds[i]) continue; - FD_SET(radfds[i], &cr); - if (radfds[i] > cn) - cn = radfds[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"); + t_actions++; + continue; + } + // check for message resend + if (tunnel[t].retry && tunnel[t].controlc) + { + // resend pending messages as timeout on reply + if (tunnel[t].retry <= TIME) + { + controlt *c = tunnel[t].controls; + uint8_t w = tunnel[t].window; + tunnel[t].try++; // another try + if (tunnel[t].try > 5) + tunnelkill(t, "Timeout on control message"); // game over + else + while (c && w--) + { + tunnelsend(c->buf, c->length, t); + c = c->next; + } + + t_actions++; + } + } + // Send hello + if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600) + { + controlt *c = controlnew(6); // sending HELLO + 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 + if ((a = cli_tunnel_actions[t].action)) + { + cli_tunnel_actions[t].action = 0; + if (a & CLI_TUN_KILL) + { + LOG(2, 0, t, "Dropping tunnel by CLI\n"); + tunnelshutdown(t, "Requested by administrator", 1, 0, 0); + t_actions++; + } + } } - while (!main_quit) + for (i = 0; i < r_slice; i++) { - fd_set r; - int n = cn; + r++; + if (r >= MAXRADIUS) + r = 1; - if (config->reload_config) + if (!radius[r].state) + continue; + + if (radius[r].retry <= TIME) { - // Update the config state based on config settings - update_config(); + radiusretry(r); + r_actions++; } + } - memcpy(&r, &cr, sizeof(fd_set)); - n = select(n + 1, &r, 0, 0, &to); - if (n < 0) + for (i = 0; i < s_slice; i++) + { + s++; + if (s > config->cluster_highest_sessionid) + s = 1; + + if (!session[s].opened) // Session isn't in use + continue; + + // check for expired sessions + if (session[s].die) { - if (errno != EINTR) + if (session[s].die <= TIME) { - perror("select"); - exit( -1); + sessionkill(s, "Expired"); + s_actions++; } + continue; } - else if (n) + + // PPP timeouts + if (sess_local[s].lcp.restart <= time_now) { - struct sockaddr_in addr; - int alen = sizeof(addr); - if (FD_ISSET(udpfd, &r)) + int next_state = session[s].ppp.lcp; + switch (session[s].ppp.lcp) { - int c, n; - for (c = 0; c < config->multi_read_count; c++) + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].lcp.conf_sent < config->ppp_max_configure) { - if ((n = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0) - processudp(buf, n, &addr); - else - break; + 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, sess_local[s].lcp_authtype); + change_state(s, lcp, next_state); } - } - if (FD_ISSET(tapfd, &r)) - { - int c, n; - for (c = 0; c < config->multi_read_count; c++) + else { - if ((n = read(tapfd, buf, sizeof(buf))) > 0) - processtap(buf, n); - else - break; + sessionshutdown(s, "No response to LCP ConfigReq.", 3, 0); + STAT(session_timeout); } + + s_actions++; } - for (i = 0; i < config->num_radfds; i++) - if (FD_ISSET(radfds[i], &r)) - processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i); - if (FD_ISSET(cluster_sockfd, &r)) - processcluster(buf, recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)); - if (FD_ISSET(controlfd, &r)) - processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr); - if (FD_ISSET(clifd, &r)) + + if (session[s].die) + continue; + } + + if (sess_local[s].ipcp.restart <= time_now) + { + int next_state = session[s].ppp.ipcp; + switch (session[s].ppp.ipcp) { - struct sockaddr_in addr; - int sockfd; - int len = sizeof(addr); + case RequestSent: + case AckReceived: + next_state = RequestSent; - if ((sockfd = accept(clifd, (struct sockaddr *)&addr, &len)) <= 0) + case AckSent: + if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure) { - log(0, 0, 0, 0, "accept error: %s\n", strerror(errno)); - continue; + 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 { - cli_do(sockfd); - close(sockfd); + sessionshutdown(s, "No response to IPCP ConfigReq.", 3, 0); + STAT(session_timeout); } + + s_actions++; } - } - /* 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 (n == 0 || next_clean <= time_now) { - clockt when = now(); - clockt best = when + 100; // default timeout - sessionidt s; - tunnelidt t; - int count; - u16 r; + if (session[s].die) + continue; + } - log(3, 0, 0, 0, "Begin regular cleanup\n"); - for (r = 1; r < MAXRADIUS; r++) - { - if (radius[r].state && radius[r].retry) - { - if (radius[r].retry <= when) - radiusretry(r); - if (radius[r].retry && radius[r].retry < best) - best = radius[r].retry; - } - else if (radius[r].state && !radius[r].retry) - radius[r].retry = backoff(radius[r].try+1); - } - for (t = 1; t < MAXTUNNEL; t++) + if (sess_local[s].ipv6cp.restart <= time_now) + { + int next_state = session[s].ppp.ipv6cp; + switch (session[s].ppp.ipv6cp) { - // check for expired tunnels - if (tunnel[t].die && tunnel[t].die <= when) - { - STAT(tunnel_timeout); - tunnelkill(t, "Expired"); - continue; - } - // check for message resend - if (tunnel[t].retry && tunnel[t].controlc) + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure) { - // resend pending messages as timeout on reply - if (tunnel[t].retry <= when) - { - controlt *c = tunnel[t].controls; - u8 w = tunnel[t].window; - tunnel[t].try++; // another try - if (tunnel[t].try > 5) - tunnelkill(t, "Timeout on control message"); // game over - else - while (c && w--) - { - tunnelsend(c->buf, c->length, t); - c = c->next; - } - } - if (tunnel[t].retry && tunnel[t].retry < best) - best = tunnel[t].retry; + 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); } - // Send hello - if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < when + 600) + else { - controlt *c = controlnew(6); // sending HELLO - controladd(c, t, 0); // send the message - log(3, tunnel[t].ip, 0, t, "Sending HELLO message\n"); + LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n"); + change_state(s, ipv6cp, Stopped); } + + s_actions++; } + } - // Check for sessions that have been killed from the CLI - if (cli_session_kill[0]) + if (sess_local[s].ccp.restart <= time_now) + { + int next_state = session[s].ppp.ccp; + switch (session[s].ppp.ccp) { - int i; - for (i = 0; i < MAXSESSION && cli_session_kill[i]; i++) + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].ccp.conf_sent < config->ppp_max_configure) { - log(2, 0, cli_session_kill[i], 0, "Dropping session by CLI\n"); - sessionshutdown(cli_session_kill[i], "Requested by administrator"); - cli_session_kill[i] = 0; + 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); } - } - // Check for tunnels that have been killed from the CLI - if (cli_tunnel_kill[0]) - { - int i; - for (i = 1; i < MAXTUNNEL && cli_tunnel_kill[i]; i++) + else { - log(2, 0, cli_tunnel_kill[i], 0, "Dropping tunnel by CLI\n"); - tunnelshutdown(cli_tunnel_kill[i], "Requested by administrator"); - cli_tunnel_kill[i] = 0; + LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n"); + change_state(s, ccp, Stopped); } + + s_actions++; } + } - count = 0; - for (s = 1; s < MAXSESSION; s++) - { - // check for expired sessions - if (session[s].die && session[s].die <= when) - { - sessionkill(s, "Expired"); - if (++count >= 1000) break; - continue; - } + // 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; + } - // Drop sessions who have not responded within IDLE_TIMEOUT seconds - if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT)) - { - sessionkill(s, "No response to LCP ECHO requests"); - STAT(session_timeout); - if (++count >= 1000) break; - 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[MAXCONTROL] = {0}; - // 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}; - u8 *q = makeppp(b, 0, 0, session[s].tunnel, s, PPPLCP); - - *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 >= 1000) break; - continue; - } + 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) + { + LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n"); + session[s].snoop_ip = 0; + session[s].snoop_port = 0; + s_actions++; + send++; } - if (config->accounting_dir && next_acct <= when) + else if (a & CLI_SESS_SNOOP) { - // Dump accounting data - next_acct = when + ACCT_TIME; - dump_acct_info(); + 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; + s_actions++; + send++; } - if (cluster_sockfd && next_cluster_ping <= when) + if (a & CLI_SESS_NOTHROTTLE) { - // Dump accounting data - next_cluster_ping = when + 50; - cluster_send_message(config->cluster_address, config->bind_address, C_PING, hostname, strlen(hostname)); + LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n"); + throttle_session(s, 0, 0); + s_actions++; + send++; } + else if (a & CLI_SESS_THROTTLE) + { + 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); - if (best < when + config->cleanup_interval) - best = when + config->cleanup_interval; // Throttle to at most once per 10 seconds - next_clean = time_now + config->cleanup_interval; - to.tv_sec = config->cleanup_interval; - to.tv_usec = 0; - log(3, 0, 0, 0, "End regular cleanup, next in %d seconds\n", config->cleanup_interval); - } - } -} + 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); + } + + // 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; + } + + LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n", + session[s].user, session[s].unique_id); + + 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 +// requests?? +// +static int still_busy(void) +{ + 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; + + for (i = config->cluster_highest_tunnelid ; i > 0 ; --i) + { + if (!tunnel[i].controlc) + continue; + + if (last_talked != TIME) + { + LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i); + last_talked = TIME; + } + return 1; + } + + // 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, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n"); + return 0; + } + + for (i = 1; i < MAXRADIUS; i++) + { + if (radius[i].state == RADIUSNULL) + continue; + if (radius[i].state == RADIUSWAIT) + continue; + + if (last_talked != TIME) + { + LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session); + last_talked = TIME; + } + return 1; + } + + return 0; +} + +#ifdef HAVE_EPOLL +# include +#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; + uint8_t buf[65536]; + clockt next_cluster_ping = 0; // send initial ping immediately + struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS]; + int maxevent = sizeof(events)/sizeof(*events); + + 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 */ + { + 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 + 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 */ + + while (!main_quit || still_busy()) + { + int more = 0; + int n; + + if (config->reload_config) + { + // Update the config state based on config settings + update_config(); + } + +#ifdef BGP + bgp_set_poll(); +#endif /* BGP */ + + 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; + + LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno)); + break; // exit + } + + if (n) + { + struct sockaddr_in addr; + 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++) + { + struct event_data *d = events[i].data.ptr; + switch (d->type) + { + case FD_TYPE_CLI: // CLI connections + { + int cli; + + alen = sizeof(addr); + if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0) + { + cli_do(cli); + close(cli); + } + else + LOG(0, 0, 0, "accept error: %s\n", strerror(errno)); + + n--; + break; + } + + // 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; + + 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); + } + } + +#ifdef BGP + bgp_process(bgp_events); +#endif /* BGP */ + + for (c = 0; n && c < config->multi_read_count; c++) + { + // 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--; + } + } + + // incoming IP + if (tun_ready) + { + if ((s = read(tunfd, buf, sizeof(buf))) > 0) + { + processtun(buf, s); + tun_pkts++; + } + else + { + tun_ready = 0; + n--; + } + } + + // cluster + if (cluster_ready) + { + 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). + if (next_cluster_ping <= TIME) + { + // Check to see which of the cluster is still alive.. + + cluster_send_ping(basetime); // Only does anything if we're a slave + cluster_check_master(); // ditto. + + cluster_heartbeat(); // Only does anything if we're a master. + cluster_check_slaves(); // ditto. + + master_update_counts(); // If we're a slave, send our byte counters to our master. + + if (config->cluster_iam_master && !config->cluster_iam_uptodate) + next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates + else + 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. + { + static clockt last_run = 0; + if (last_run != TIME) + { + last_run = TIME; + tbf_run_timer(); + } + } + + // Handle timeouts, retries etc. + { + 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) + { + regular_cleanups(diff); + last_clean = this_clean; + } + } + + if (*config->accounting_dir) + { + 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); + } + } + } + + // Are we the master and shutting down?? + if (config->cluster_iam_master) + cluster_heartbeat(); // Flush any queued changes.. + + // Ok. Notify everyone we're shutting down. If we're + // the master, this will force an election. + cluster_send_ping(0); + + // + // Important!!! We MUST not process any packets past this point! + LOG(1, 0, 0, "Shutdown complete\n"); +} + +static void stripdomain(char *host) +{ + char *p; + + if ((p = strchr(host, '.'))) + { + char *domain = 0; + char _domain[1024]; + + // strip off domain + FILE *resolv = fopen("/etc/resolv.conf", "r"); + if (resolv) + { + char buf[1024]; + char *b; + + while (fgets(buf, sizeof(buf), resolv)) + { + if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6)) + continue; + + if (!isspace(buf[6])) + continue; + + b = buf + 7; + while (isspace(*b)) b++; + + if (*b) + { + char *d = b; + while (*b && !isspace(*b)) b++; + *b = 0; + if (buf[0] == 'd') // domain is canonical + { + domain = d; + break; + } + + // first search line + if (!domain) + { + // hold, may be subsequent domain line + strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0; + domain = _domain; + } + } + } + + fclose(resolv); + } + + if (domain) + { + int hl = strlen(host); + int dl = strlen(domain); + if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain)) + host[hl -dl - 1] = 0; + } + else + { + *p = 0; // everything after first dot + } + } +} + +// Init data structures +static void initdata(int optdebug, char *optconfig) +{ + int i; + + if (!(config = shared_malloc(sizeof(configt)))) + { + fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno)); + exit(1); + } + + 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 + 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))) + { + LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno)); + exit(1); + } + if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION))) + { + LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno)); + exit(1); + } + + if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION))) + { + LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno)); + exit(1); + } + + if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS))) + { + LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno)); + exit(1); + } + + if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL))) + { + LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno)); + exit(1); + } + + if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER))) + { + LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno)); + exit(1); + } + memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER); + + if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION))) + { + 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))) + { + 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); + + memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL); + memset(session, 0, sizeof(sessiont) * MAXSESSION); + memset(radius, 0, sizeof(radiust) * MAXRADIUS); + memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL); + + // Put all the sessions on the free list marked as undefined. + for (i = 1; i < MAXSESSION; i++) + { + session[i].next = i + 1; + session[i].tunnel = T_UNDEF; // mark it as not filled in. + } + session[MAXSESSION - 1].next = 0; + sessionfree = 1; + + // Mark all the tunnels as undefined (waiting to be filled in by a download). + for (i = 1; i < MAXTUNNEL; i++) + tunnel[i].state = TUNNELUNDEF; // mark it as not filled in. + + if (!*hostname) + { + // Grab my hostname unless it's been specified + gethostname(hostname, sizeof(hostname)); + stripdomain(hostname); + } + + _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, "Error doing malloc for bgp: %s\n", strerror(errno)); + exit(1); + } +#endif /* BGP */ +} + +static int assign_ip_address(sessionidt s) +{ + uint32_t i; + int best = -1; + time_t best_time = time_now; + char *u = session[s].user; + char reuse = 0; + + + CSTAT(assign_ip_address); + + for (i = 1; i < ip_pool_size; i++) + { + if (!ip_address_pool[i].address || ip_address_pool[i].assigned) + continue; + + if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user)) + { + best = i; + reuse = 1; + break; + } + + if (ip_address_pool[i].last < best_time) + { + best = i; + if (!(best_time = ip_address_pool[i].last)) + break; // never used, grab this one + } + } + + if (best < 0) + { + LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n"); + return 0; + } + + session[s].ip = ip_address_pool[best].address; + session[s].ip_pool_index = best; + ip_address_pool[best].assigned = 1; + ip_address_pool[best].last = time_now; + ip_address_pool[best].session = s; + if (session[s].walled_garden) + /* Don't track addresses of users in walled garden (note: this + means that their address isn't "sticky" even if they get + un-gardened). */ + ip_address_pool[best].user[0] = 0; + else + strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1); + + STAT(ip_allocated); + LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n", + reuse ? "Reusing" : "Allocating", best); + + return 1; +} + +static void free_ip_address(sessionidt s) +{ + int i = session[s].ip_pool_index; + + + CSTAT(free_ip_address); + + if (!session[s].ip) + return; // what the? + + if (i < 0) // Is this actually part of the ip pool? + i = 0; + + STAT(ip_freed); + cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index. + session[s].ip = 0; + ip_address_pool[i].assigned = 0; + ip_address_pool[i].session = 0; + ip_address_pool[i].last = time_now; +} + +// +// Fsck the address pool against the session table. +// Normally only called when we become a master. +// +// This isn't perfect: We aren't keep tracking of which +// users used to have an IP address. +// +void rebuild_address_pool(void) +{ + int i; + + // + // Zero the IP pool allocation, and build + // a map from IP address to pool index. + for (i = 1; i < MAXIPPOOL; ++i) + { + ip_address_pool[i].assigned = 0; + ip_address_pool[i].session = 0; + if (!ip_address_pool[i].address) + continue; + + cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index. + } + + for (i = 0; i < MAXSESSION; ++i) + { + int ipid; + if (!(session[i].opened && session[i].ip)) + continue; + + ipid = - lookup_ipmap(htonl(session[i].ip)); + + if (session[i].ip_pool_index < 0) + { + // Not allocated out of the pool. + if (ipid < 1) // Not found in the pool either? good. + continue; + + 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. + } + + + if (ipid > MAXIPPOOL || ipid < 0) + { + 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; + } + + ip_address_pool[ipid].assigned = 1; + ip_address_pool[ipid].session = i; + ip_address_pool[ipid].last = time_now; + strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1); + session[i].ip_pool_index = ipid; + cache_ipmap(session[i].ip, i); // Fix the ip map. + } +} + +// +// Fix the address pool to match a changed session. +// (usually when the master sends us an update). +static void fix_address_pool(int sid) +{ + int ipid; + + ipid = session[sid].ip_pool_index; + + if (ipid > ip_pool_size) + return; // Ignore it. rebuild_address_pool will fix it up. + + if (ip_address_pool[ipid].address != session[sid].ip) + return; // Just ignore it. rebuild_address_pool will take care of it. + + ip_address_pool[ipid].assigned = 1; + ip_address_pool[ipid].session = sid; + ip_address_pool[ipid].last = time_now; + strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1); +} + +// +// Add a block of addresses to the IP pool to hand out. +// +static void add_to_ip_pool(in_addr_t addr, in_addr_t mask) +{ + int i; + if (mask == 0) + mask = 0xffffffff; // Host route only. + + addr &= mask; + + if (ip_pool_size >= MAXIPPOOL) // Pool is full! + return ; + + for (i = addr ;(i & mask) == addr; ++i) + { + if ((i & 0xff) == 0 || (i&0xff) == 255) + continue; // Skip 0 and broadcast addresses. + + ip_address_pool[ip_pool_size].address = i; + ip_address_pool[ip_pool_size].assigned = 0; + ++ip_pool_size; + if (ip_pool_size >= MAXIPPOOL) + { + LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0)); + return; + } + } +} + +// Initialize the IP address pool +static void initippool() +{ + FILE *f; + char *p; + char buf[4096]; + memset(ip_address_pool, 0, sizeof(ip_address_pool)); + + if (!(f = fopen(IPPOOLFILE, "r"))) + { + LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno)); + exit(1); + } + + while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f)) + { + char *pool = buf; + buf[4095] = 0; // Force it to be zero terminated/ + + if (*buf == '#' || *buf == '\n') + continue; // Skip comments / blank lines + if ((p = (char *)strrchr(buf, '\n'))) *p = 0; + if ((p = (char *)strchr(buf, ':'))) + { + in_addr_t src; + *p = '\0'; + src = inet_addr(buf); + if (src == INADDR_NONE) + { + LOG(0, 0, 0, "Invalid address pool IP %s\n", buf); + exit(1); + } + // This entry is for a specific IP only + if (src != config->bind_address) + continue; + *p = ':'; + pool = p+1; + } + if ((p = (char *)strchr(pool, '/'))) + { + // It's a range + int numbits = 0; + in_addr_t start = 0, mask = 0; + + LOG(2, 0, 0, "Adding IP address range %s\n", buf); + *p++ = 0; + if (!*p || !(numbits = atoi(p))) + { + LOG(0, 0, 0, "Invalid pool range %s\n", buf); + continue; + } + start = ntohl(inet_addr(pool)); + mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits); + + // Add a static route for this pool + 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); + } + else + { + // It's a single ip address + add_to_ip_pool(inet_addr(pool), 0); + } + } + fclose(f); + LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1); +} + +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) + return; + + snoop_addr.sin_family = AF_INET; + snoop_addr.sin_addr.s_addr = destination; + snoop_addr.sin_port = ntohs(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) + LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno)); + + STAT(packets_snooped); +} + +static int dump_session(FILE **f, sessiont *s) +{ + if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden) + return 1; + + if (!*f) + { + char filename[1024]; + char timestr[64]; + time_t now = time(NULL); + + strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now)); + snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr); + + if (!(*f = fopen(filename, "w"))) + { + LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno)); + return 0; + } + + 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]); + + shut_acct_n = 0; + } + + if (all) + for (i = 1; i <= config->cluster_highest_sessionid; i++) + dump_session(&f, &session[i]); + + if (f) + fclose(f); +} + +// Main program +int main(int argc, char *argv[]) +{ + int i; + int optdebug = 0; + char *optconfig = CONFIGFILE; + + time(&basetime); // start clock + + // scan args + while ((i = getopt(argc, argv, "dvc:h:")) >= 0) + { + switch (i) + { + case 'd': + if (fork()) exit(0); + setsid(); + freopen("/dev/null", "r", stdin); + freopen("/dev/null", "w", stdout); + freopen("/dev/null", "w", stderr); + break; + case 'v': + optdebug++; + break; + case 'c': + optconfig = optarg; + break; + case 'h': + snprintf(hostname, sizeof(hostname), "%s", optarg); + break; + default: + printf("Args are:\n" + "\t-d\t\tDetach from terminal\n" + "\t-c \tConfig file\n" + "\t-h \tForce hostname\n" + "\t-v\t\tDebug\n"); + + return (0); + break; + } + } + + // Start the timer routine off + time(&time_now); + strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now)); + signal(SIGALRM, sigalrm_handler); + siginterrupt(SIGALRM, 0); + + initplugins(); + initdata(optdebug, optconfig); + + init_cli(hostname); + read_config_file(); + init_tbf(config->num_tbfs); + + 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) + LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno)); + + // Make core dumps go to /tmp + chdir("/tmp"); + } + + if (config->scheduler_fifo) + { + int ret; + struct sched_param params = {0}; + params.sched_priority = 1; + + if (get_nprocs() < 2) + { + 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, ¶ms)) == 0) + { + LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n"); + } + else + { + LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno)); + config->scheduler_fifo = 0; + } + } + } -// Init data structures -void initdata(void) + /* Set up the cluster communications port. */ + if (cluster_init() < 0) + exit(1); + + inittun(); + LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice); + + initudp(); + initrad(); + initippool(); + + // seed prng + { + unsigned seed = time_now ^ getpid(); + LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed); + srand(seed); + } + + signal(SIGHUP, sighup_handler); + signal(SIGCHLD, sigchild_handler); + signal(SIGTERM, shutdown_handler); + signal(SIGINT, shutdown_handler); + signal(SIGQUIT, shutdown_handler); + + // Prevent us from getting paged out + if (config->lock_pages) + { + 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)); + } + + alarm(1); + + // Drop privileges here + if (config->target_uid > 0 && geteuid() == 0) + setuid(config->target_uid); + + mainloop(); + + /* 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) { - int i; + if (log_stream) + { + if (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); - _statistics = mmap(NULL, sizeof(struct Tstats), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (_statistics == MAP_FAILED) { - log(0, 0, 0, 0, "Error doing mmap for _statistics: %s\n", strerror(errno)); - exit(1); + // Run timer hooks + struct param_timer p = { time_now }; + run_plugins(PLUGIN_TIMER, &p); } - config = mmap(NULL, sizeof(struct configt), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (config == MAP_FAILED) + +} + +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; + + if (!*config->l2tpsecret) { - log(0, 0, 0, 0, "Error doing mmap for configuration: %s\n", strerror(errno)); - exit(1); + LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n"); + return; } - memset(config, 0, sizeof(struct configt)); - time(&config->start_time); - strncpy(config->config_file, CONFIGFILE, sizeof(config->config_file) - 1); - tunnel = mmap(NULL, sizeof(tunnelt) * MAXTUNNEL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (tunnel == MAP_FAILED) + + LOG(4, 0, 0, " Building challenge response for CHAP request\n"); + + *challenge_response = calloc(17, 1); + + MD5_Init(&ctx); + MD5_Update(&ctx, &id, 1); + MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); + MD5_Update(&ctx, challenge, challenge_length); + MD5_Final(*challenge_response, &ctx); + + return; +} + +static int facility_value(char *name) +{ + int i; + for (i = 0; facilitynames[i].c_name; i++) { - log(0, 0, 0, 0, "Error doing mmap for tunnels: %s\n", strerror(errno)); - exit(1); + if (strcmp(facilitynames[i].c_name, name) == 0) + return facilitynames[i].c_val; } - session = mmap(NULL, sizeof(sessiont) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (session == MAP_FAILED) + return 0; +} + +static void update_config() +{ + int i; + char *p; + static int timeout = 0; + static int interval = 0; + + // Update logging + closelog(); + syslog_log = 0; + if (log_stream) { - log(0, 0, 0, 0, "Error doing mmap for sessions: %s\n", strerror(errno)); - exit(1); + if (log_stream != stderr) + fclose(log_stream); + + log_stream = NULL; } - radius = mmap(NULL, sizeof(radiust) * MAXRADIUS, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (radius == MAP_FAILED) + + if (*config->log_filename) { - log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno)); - exit(1); + if (strstr(config->log_filename, "syslog:") == config->log_filename) + { + char *p = config->log_filename + 7; + if (*p) + { + openlog("l2tpns", LOG_PID, facility_value(p)); + syslog_log = 1; + } + } + else if (strchr(config->log_filename, '/') == config->log_filename) + { + if ((log_stream = fopen((char *)(config->log_filename), "a"))) + { + fseek(log_stream, 0, SEEK_END); + setbuf(log_stream, NULL); + } + else + { + log_stream = stderr; + setbuf(log_stream, NULL); + } + } } - ip_address_pool = mmap(NULL, sizeof(ippoolt) * MAXIPPOOL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (ip_address_pool == MAP_FAILED) + else { - log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno)); - exit(1); + log_stream = stderr; + setbuf(log_stream, NULL); } -#ifdef RINGBUFFER - ringbuffer = mmap(NULL, sizeof(struct Tringbuffer), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (ringbuffer == MAP_FAILED) + + // Update radius + config->numradiusservers = 0; + for (i = 0; i < MAXRADSERVER; i++) + if (config->radiusserver[i]) + { + config->numradiusservers++; + // Set radius port: if not set, take the port from the + // first radius server. For the first radius server, + // take the #defined default value from l2tpns.h + + // 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]) + 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) { - log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno)); - exit(1); + 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; } - memset(ringbuffer, 0, sizeof(struct Tringbuffer)); -#endif - cli_session_kill = mmap(NULL, sizeof(sessionidt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (cli_session_kill == MAP_FAILED) + if (!config->radius_authtypes) { - log(0, 0, 0, 0, "Error doing mmap for cli session kill: %s\n", strerror(errno)); - exit(1); + 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"); } - memset(cli_session_kill, 0, sizeof(sessionidt) * MAXSESSION); - cli_tunnel_kill = mmap(NULL, sizeof(tunnelidt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (cli_tunnel_kill == MAP_FAILED) + else { - log(0, 0, 0, 0, "Error doing mmap for cli tunnel kill: %s\n", strerror(errno)); - exit(1); + strcpy(config->radius_authtypes_s, "chap"); + if (config->radius_authtypes & AUTHPAP) + strcat(config->radius_authtypes_s, ", pap"); } - memset(cli_tunnel_kill, 0, sizeof(tunnelidt) * MAXSESSION); - filter_buckets = mmap(NULL, sizeof(tbft) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0); - if (filter_buckets == MAP_FAILED) + 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++) { - log(0, 0, 0, 0, "Error doing mmap for filter buckets: %s\n", strerror(errno)); - exit(1); + if (strcmp(config->plugins[i], config->old_plugins[i]) == 0) + continue; + + if (*config->plugins[i]) + { + // Plugin added + add_plugin(config->plugins[i]); + } + else if (*config->old_plugins[i]) + { + // Plugin removed + remove_plugin(config->old_plugins[i]); + } } - memset(filter_buckets, 0, sizeof(tbft) * MAXSESSION); - memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL); - memset(session, 0, sizeof(sessiont) * MAXSESSION); - memset(radius, 0, sizeof(radiust) * MAXRADIUS); - memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL); - for (i = 1; i < MAXSESSION - 1; i++) - session[i].next = i + 1; - session[MAXSESSION - 1].next = 0; - sessionfree = 1; - if (!*hostname) + memcpy(config->old_plugins, config->plugins, sizeof(config->plugins)); + 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) + strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1); + + if (!config->cluster_hb_interval) + config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds. + + if (!config->cluster_hb_timeout) + config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election. + + if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout) { - char *p; - // Grab my hostname unless it's been specified - gethostname(hostname, sizeof(hostname)); + // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as + // late, ensure we're sufficiently larger than that + int t = 4 * config->cluster_hb_interval + 11; + + if (config->cluster_hb_timeout < t) { - struct hostent *h = gethostbyname(hostname); - if (h) - myip = ntohl(*(u32 *) h->h_addr); + LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t); + config->cluster_hb_timeout = t; } - if ((p = strstr(hostname, ".optusnet.com.au"))) *p = 0; + // Push timing changes to the slaves immediately if we're the master + if (config->cluster_iam_master) + cluster_heartbeat(); + + interval = config->cluster_hb_interval; + timeout = config->cluster_hb_timeout; } - _statistics->start_time = _statistics->last_reset = time(NULL); + + // Write PID file + if (*config->pid_file == '/' && !config->wrote_pid) + { + FILE *f; + if ((f = fopen(config->pid_file, "w"))) + { + fprintf(f, "%d\n", getpid()); + fclose(f); + config->wrote_pid = 1; + } + else + { + LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno)); + } + } + + config->reload_config = 0; } -void initiptables(void) +static void read_config_file() { - /* Flush the tables here so that we have a clean slate */ - system("iptables -t nat -F l2tpns"); - system("iptables -t mangle -F l2tpns"); + FILE *f; + + if (!config->config_file) return; + if (!(f = fopen(config->config_file, "r"))) + { + fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno)); + return; + } + + LOG(3, 0, 0, "Reading config file %s\n", config->config_file); + cli_do_file(f); + LOG(3, 0, 0, "Done reading config file\n"); + fclose(f); + update_config(); } -int assign_ip_address(sessionidt s) +int sessionsetup(sessionidt s, tunnelidt t) { - unsigned i; - int best = -1; - clockt best_time = time_now; - char *u = session[s].user; - char reuse = 0; + // A session now exists, set it up + in_addr_t ip; + char *user; + sessionidt i; + int r; -#ifdef STAT_CALLS - STAT(call_assign_ip_address); -#endif - for (i = 0; i < ip_pool_size; i++) + CSTAT(sessionsetup); + + LOG(3, s, t, "Doing session setup for session\n"); + + if (!session[s].ip) { - if (!ip_address_pool[i].address || ip_address_pool[i].assigned) - continue; + assign_ip_address(s); + if (!session[s].ip) + { + 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; + } + LOG(3, s, t, " No IP allocated. Assigned %s from pool\n", + fmtaddr(htonl(session[s].ip), 0)); + } + + + // Make sure this is right + session[s].tunnel = t; + + // zap old sessions with same IP and/or username + // Don't kill gardened sessions - doing so leads to a DoS + // from someone who doesn't need to know the password + { + ip = session[s].ip; + user = session[s].user; + for (i = 1; i <= config->cluster_highest_sessionid; i++) + { + if (i == s) continue; + 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"); + } + } + + { + int routed = 0; - if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user)) + // Add the route for this session. + for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++) { - best = i; - reuse = 1; - break; + 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, 1); } - if (ip_address_pool[i].last < best_time) + // 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 { - best = i; - if (!(best_time = ip_address_pool[i].last)) - break; // never used, grab this one + if (!routed) routeset(s, session[s].ip, 0, 0, 1); } + else + cache_ipmap(session[s].ip, s); } - if (best < 0) + 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. { - log(0, 0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n"); - return 0; + struct param_new_session data = { &tunnel[t], &session[s] }; + run_plugins(PLUGIN_NEW_SESSION, &data); } - session[s].ip = ntohl(ip_address_pool[best].address); - session[s].ip_pool_index = best; - ip_address_pool[best].assigned = 1; - ip_address_pool[best].last = time_now; - ip_address_pool[best].session = s; - if (session[s].walled_garden) - /* Don't track addresses of users in walled garden (note: this - means that their address isn't "sticky" even if they get - un-gardened). */ - ip_address_pool[best].user[0] = 0; - else - 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); - - return 1; -} + // Allocate TBFs if throttled + if (session[s].throttle_in || session[s].throttle_out) + throttle_session(s, session[s].throttle_in, session[s].throttle_out); -void free_ip_address(sessionidt s) -{ - int i = session[s].ip_pool_index; + session[s].last_packet = time_now; -#ifdef STAT_CALLS - STAT(call_free_ip_address); -#endif + 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); - if (!session[s].ip) - return; // what the? + cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster. - STAT(ip_freed); - uncache_sessionid(session[s].ip); - session[s].ip = 0; - ip_address_pool[i].assigned = 0; - ip_address_pool[i].session = 0; - ip_address_pool[i].last = time_now; + return 1; // RADIUS OK and IP allocated, done... } -// Initialize the IP address pool -void initippool() +// +// This session just got dropped on us by the master or something. +// Make sure our tables up up to date... +// +int load_session(sessionidt s, sessiont *new) { - FILE *f; - char *buf, *p; - int pi = 0; - memset(ip_address_pool, 0, sizeof(ip_address_pool)); + int i; + int newip = 0; - if (!(f = fopen(IPPOOLFILE, "r"))) + // Sanity checks. + if (new->ip_pool_index >= MAXIPPOOL || + new->tunnel >= MAXTUNNEL) { - log(0, 0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno)); - exit(-1); + LOG(0, s, 0, "Strange session update received!\n"); + // FIXME! What to do here? + return 0; } - buf = (char *)malloc(4096); + // + // Ok. All sanity checks passed. Now we're committed to + // loading the new session. + // + + session[s].tunnel = new->tunnel; // For logging in cache_ipmap + + // See if routes/ip cache need updating + if (new->ip != session[s].ip) + newip++; - while (pi < MAXIPPOOL && fgets(buf, 4096, f)) + 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++; + + // needs update + if (newip) { - char* pool = buf; - if (*buf == '#' || *buf == '\n') - continue; // Skip comments / blank lines - if ((p = (char *)strrchr(buf, '\n'))) *p = 0; - if ((p = (char *)strchr(buf, ':'))) - { - ipt src; - *p = '\0'; - src = inet_addr(buf); - if (src == INADDR_NONE) - { - log(0, 0, 0, 0, "Invalid address pool IP %s", buf); - exit(-1); - } - // This entry is for a specific IP only - if (src != config->bind_address) - continue; - *p = ':'; - pool = p+1; - } - if ((p = (char *)strchr(pool, '/'))) + int routed = 0; + + // remove old routes... + for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++) { - // It's a range - int numbits = 0; - unsigned long start = 0, end = 0, mask = 0, ip; - struct rtentry r; + if ((session[s].ip & session[s].route[i].mask) == + (session[s].route[i].ip & session[s].route[i].mask)) + routed++; - log(2, 0, 0, 0, "Adding IP address range %s\n", buf); - *p++ = 0; - if (!*p || !(numbits = atoi(p))) - { - log(0, 0, 0, 0, "Invalid pool range %s\n", buf); - continue; - } - start = end = ntohl(inet_addr(pool)); - mask = (unsigned long)(pow(2, numbits) - 1) << (32 - numbits); - start &= mask; - end = start + (int)(pow(2, (32 - numbits))) - 1; - for (ip = (start + 1); ip < end && pi < MAXIPPOOL; ip++) - { - if ((ip & 0xFF) == 0 || (ip & 0xFF) == 255) - continue; - ip_address_pool[pi++].address = htonl(ip); - } + routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0); + } - // Add a static route for this pool - log(5, 0, 0, 0, "Adding route for address pool %s/%lu\n", inet_toa(htonl(start)), 32 + mask); - memset(&r, 0, sizeof(r)); - r.rt_dev = config->tapdevice; - r.rt_dst.sa_family = AF_INET; - *(u32 *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(start); - r.rt_genmask.sa_family = AF_INET; - *(u32 *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask); - r.rt_flags = (RTF_UP | RTF_STATIC); - if (ioctl(ifrfd, SIOCADDRT, (void *) &r) < 0) + // ...ip + if (session[s].ip) + { + if (session[s].ip_pool_index == -1) // static IP { - log(0, 0, 0, 0, "Error adding ip address pool route %s/%lu: %s\n", - inet_toa(start), mask, strerror(errno)); + 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 a single ip address - ip_address_pool[pi++].address = inet_addr(pool); - } - } - - free(buf); - fclose(f); - log(1, 0, 0, 0, "IP address pool is %d addresses\n", pi); - ip_pool_size = pi; -} - -void snoop_send_packet(char *packet, u16 size) -{ - if (!snoop_addr.sin_port || snoopfd <= 0 || size <= 0 || !packet) - return; - 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)); - 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)); - STAT(packets_snooped); -} - -void dump_acct_info() -{ - char filename[1024]; - char timestr[64]; - time_t t = time(NULL); - int i; - FILE *f = NULL; - -#ifdef STAT_CALLS - STAT(call_dump_acct_info); -#endif - strftime(timestr, 64, "%Y%m%d%H%M%S", localtime(&t)); - snprintf(filename, 1024, "%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) - { - 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(4, 0, 0, 0, "Dumping accounting information for %s\n", session[i].user); - fprintf(f, "%s %s %d %lu %lu\n", - session[i].user, // username - inet_toa(htonl(session[i].ip)), // ip - (session[i].throttle) ? 2 : 1, // qos - (unsigned long)session[i].cin, // uptxoctets - (unsigned long)session[i].cout); // downrxoctets - - session[i].pin = session[i].cin = 0; - session[i].pout = session[i].cout = 0; - } - - if (f) fclose(f); -} + routed = 0; -// Main program -int main(int argc, char *argv[]) -{ - int o; - - _program_name = strdup(argv[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++; - time(&basetime); // start clock - // scan args + routeset(s, new->route[i].ip, new->route[i].mask, 0, 1); + } - while ((o = getopt(argc, argv, "vc:h:a:")) >= 0) - { - switch (o) + // ...ip + if (new->ip) { - case 'v': - config->debug++; - break; - case 'h': - strncpy(hostname, optarg, 999); - break; - case '?': - default: - printf("Args are:\n\t-c \tConfig file\n\t-h \tForce hostname\n\t-a
\tUse specific address\n\t-v\t\tDebug\n"); - return (0); - break; + // If there's a new one, add it. + if (new->ip_pool_index == -1) + { + if (!routed) routeset(s, new->ip, 0, 0, 1); + } + else + cache_ipmap(new->ip, s); } } - // Start the timer routine off - time(&time_now); - strftime(time_now_string, 64, "%Y-%m-%d %H:%M:%S", localtime(&time_now)); - signal(SIGALRM, sigalrm_handler); - siginterrupt(SIGALRM, 0); + // check v6 routing + if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened) + route6set(s, new->ipv6route, new->ipv6prefixlen, 1); - initiptables(); - initplugins(); - initdata(); - init_cli(); - read_config_file(); - log(0, 0, 0, 0, "$Id: l2tpns.c,v 1.6 2004/05/24 04:20:28 fred_nerk Exp $\n(c) Copyright 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n"); + // check filters + if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[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)); - // Make core dumps go to /tmp - chdir("/tmp"); + LOG(2, s, session[s].tunnel, "Dropping invalid input filter %d\n", (int) new->filter_in); + new->filter_in = 0; } - /* Start up the cluster first, so that we don't have two machines with - * the same IP at once. - * This is still racy, but the second GARP should fix that - */ - cluster_init(config->bind_address, 0); - cluster_send_message(config->cluster_address, config->bind_address, C_HELLO, hostname, strlen(hostname)); - - inittap(); - log(1, 0, 0, 0, "Set up on interface %s\n", config->tapdevice); - - initudp(); - initrad(); - initippool(); - init_rl(); - if (config->bind_address) - send_garp(config->bind_address); + 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 NOSTATEFILE exists, we will ignore any updates from the cluster master for this execution - if (!unlink(NOSTATEFILE)) - config->ignore_cluster_updates = 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++; + } - read_state(); + 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++; + } - signal(SIGHUP, sighup_handler); - signal(SIGTERM, sigterm_handler); - signal(SIGINT, sigterm_handler); - signal(SIGQUIT, sigquit_handler); - signal(SIGCHLD, sigchild_handler); + 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; - alarm(1); + memcpy(&session[s], new, sizeof(session[s])); // Copy over.. - // Drop privileges here - if (config->target_uid > 0 && geteuid() == 0) - setuid(config->target_uid); + // Do fixups into address pool. + if (new->ip_pool_index != -1) + fix_address_pool(s); - mainloop(); - return 0; + return 1; } -void sighup_handler(int junk) +static void initplugins() { - if (log_stream && log_stream != stderr) - { - fclose(log_stream); - log_stream = NULL; - } + int i; - read_config_file(); + loaded_plugins = ll_init(); + // Initialize the plugins to nothing + for (i = 0; i < MAX_PLUGIN_TYPES; i++) + plugins[i] = ll_init(); } -void sigalrm_handler(int junk) +static void *open_plugin(char *plugin_name, int load) { - // Log current traffic stats + char path[256] = ""; - snprintf(config->bandwidth, sizeof(config->bandwidth), - "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%lu OUT:%lu", - (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); + snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name); + LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path); + return dlopen(path, RTLD_NOW); +} - udp_tx = udp_rx = 0; - udp_rx_pkt = eth_rx_pkt = 0; - eth_tx = eth_rx = 0; +// plugin callback to get a config value +static void *getconfig(char *key, enum config_typet type) +{ + int i; - if (config->dump_speed) - printf("%s\n", config->bandwidth); + for (i = 0; config_values[i].key; i++) + { + if (!strcmp(config_values[i].key, key)) + { + if (config_values[i].type == type) + return ((void *) config) + config_values[i].offset; - // Update the internal time counter - time(&time_now); - strftime(time_now_string, 64, "%Y-%m-%d %H:%M:%S", localtime(&time_now)); - alarm(1); + LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n", + key, type, config_values[i].type); - { - // Run timer hooks - struct param_timer p = { time_now }; - run_plugins(PLUGIN_TIMER, &p); + return 0; + } } + LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key); + return 0; } -void sigterm_handler(int junk) -{ - log(1, 0, 0, 0, "Shutting down cleanly\n"); - if (config->save_state) - dump_state(); - main_quit++; -} - -void sigquit_handler(int junk) +static int add_plugin(char *plugin_name) { - FILE *f; + static struct pluginfuncs funcs = { + _log, + _log_hex, + fmtaddr, + sessionbyuser, + sessiontbysessionidt, + sessionidtbysessiont, + radiusnew, + radiussend, + getconfig, + sessionshutdown, + sessionkill, + throttle_session, + cluster_send_session, + }; + + void *p = open_plugin(plugin_name, 1); + int (*initfunc)(struct pluginfuncs *); int i; - log(1, 0, 0, 0, "Shutting down without saving sessions\n"); - for (i = 1; i < MAXSESSION; i++) + if (!p) { - if (session[i].opened) - sessionkill(i, "L2TPNS Closing"); + LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror()); + return -1; } - for (i = 1; i < MAXTUNNEL; i++) + + if (ll_contains(loaded_plugins, p)) + { + dlclose(p); + return 0; // already loaded + } + + { + int *v = dlsym(p, "plugin_api_version"); + if (!v || *v != PLUGIN_API_VERSION) + { + LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror()); + dlclose(p); + return -1; + } + } + + if ((initfunc = dlsym(p, "plugin_init"))) { - if (tunnel[i].ip || tunnel[i].state) - tunnelshutdown(i, "L2TPNS Closing"); + if (!initfunc(&funcs)) + { + LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror()); + dlclose(p); + return -1; + } } - cluster_send_goodbye(); + ll_push(loaded_plugins, p); - // Touch a file which says not to reload the state - f = fopen(NOSTATEFILE, "w"); - if (f) fclose(f); + for (i = 0; i < max_plugin_functions; i++) + { + void *x; + if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i]))) + { + LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]); + ll_push(plugins[i], x); + } + } - main_quit++; + LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name); + return 1; } -void sigchild_handler(int signal) +static void run_plugin_done(void *plugin) { - while (waitpid(-1, NULL, WNOHANG) > 0) - ; + int (*donefunc)(void) = dlsym(plugin, "plugin_done"); + + if (donefunc) + donefunc(); } -void read_state() +static int remove_plugin(char *plugin_name) { - struct stat sb; - int i; - ippoolt itmp; - FILE *f; - char magic[sizeof(DUMP_MAGIC)-1]; - u32 buf[2]; - - if (!config->save_state) - return; + void *p = open_plugin(plugin_name, 0); + int loaded = 0; - // Ignore saved state if NOSTATEFILE exists - if (config->ignore_cluster_updates) - { - unlink(STATEFILE); - return; - } + if (!p) + return -1; - if (stat(STATEFILE, &sb) < 0) - return; + if (ll_contains(loaded_plugins, p)) + { + int i; + for (i = 0; i < max_plugin_functions; i++) + { + void *x; + if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i]))) + ll_delete(plugins[i], x); + } - 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); - } - - memcpy(&ip_address_pool[i], &itmp, sizeof(itmp)); - } - - if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXTUNNEL || buf[1] != sizeof(tunnelt)) - { - log(0, 0, 0, 0, "Error/mismatch reading tunnel header from state file\n"); - exit(1); - } - - 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); - } - - for (i = 0; i < MAXTUNNEL; i++) - { - 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 (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); - } - - 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); - } - - for (i = 0; i < MAXSESSION; i++) - { - session[i].tbf = 0; - if (session[i].opened) - { - log(2, 0, i, 0, "Loaded active session for user %s\n", session[i].user); - if (session[i].ip && session[i].ip != 0xFFFFFFFE) - sessionsetup(session[i].tunnel, i, 0); - } - } - - fclose(f); - log(0, 0, 0, 0, "Loaded saved state information\n"); -} - -void dump_state() -{ - FILE *f; - u32 buf[2]; - - if (!config->save_state) - return; + ll_delete(loaded_plugins, p); + run_plugin_done(p); + loaded = 1; + } - do { - if (!(f = fopen(STATEFILE, "w"))) - break; + dlclose(p); + LOG(2, 0, 0, "Removed plugin %s\n", plugin_name); + return loaded; +} - log(1, 0, 0, 0, "Dumping state information\n"); +int run_plugins(int plugin_type, void *data) +{ + int (*func)(void *data); - if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC)-1, 1, f) != 1) break; + if (!plugins[plugin_type] || plugin_type > max_plugin_functions) + return PLUGIN_RET_ERROR; - 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; + ll_reset(plugins[plugin_type]); + while ((func = ll_next(plugins[plugin_type]))) + { + int r = func(data); - 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 (r != PLUGIN_RET_OK) + return r; // stop here + } - 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; + return PLUGIN_RET_OK; +} - if (fclose(f) == 0) return; // OK - } while (0); +static void plugins_done() +{ + void *p; - log(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno)); - unlink(STATEFILE); + ll_reset(loaded_plugins); + while ((p = ll_next(loaded_plugins))) + run_plugin_done(p); } -void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response) +static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen) { - MD5_CTX ctx; - *challenge_response = NULL; + struct nsctl request; + struct nsctl response; + int type = unpack_control(&request, buf, len); + int r; + void *p; - if (!*config->l2tpsecret) + if (log_stream && config->debug >= 4) { - log(0, 0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n"); - return; + if (type < 0) + { + LOG(4, 0, 0, "Bogus control message from %s (%d)\n", + fmtaddr(addr->sin_addr.s_addr, 0), type); + } + else + { + LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0)); + dump_control(&request, log_stream); + } } - log(4, 0, 0, 0, " Building challenge response for CHAP request\n"); + switch (type) + { + case NSCTL_REQ_LOAD: + if (request.argc != 1) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = "name of plugin required"; + } + else if ((r = add_plugin(request.argv[0])) < 1) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = !r + ? "plugin already loaded" + : "error loading plugin"; + } + else + { + response.type = NSCTL_RES_OK; + response.argc = 0; + } - *challenge_response = (char *)calloc(17, 1); + break; - MD5Init(&ctx); - MD5Update(&ctx, &id, 1); - MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); - MD5Update(&ctx, challenge, challenge_length); - MD5Final(*challenge_response, &ctx); + case NSCTL_REQ_UNLOAD: + if (request.argc != 1) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = "name of plugin required"; + } + else if ((r = remove_plugin(request.argv[0])) < 1) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = !r + ? "plugin not loaded" + : "plugin not found"; + } + else + { + response.type = NSCTL_RES_OK; + response.argc = 0; + } - return; -} + break; -static int facility_value(char *name) -{ - int i; - for (i = 0; facilitynames[i].c_name; i++) - { - if (strcmp(facilitynames[i].c_name, name) == 0) - return facilitynames[i].c_val; - } - return 0; -} + case NSCTL_REQ_HELP: + response.type = NSCTL_RES_OK; + response.argc = 0; -void update_config() -{ - int i; + ll_reset(loaded_plugins); + while ((p = ll_next(loaded_plugins))) + { + char **help = dlsym(p, "plugin_control_help"); + while (response.argc < 0xff && help && *help) + response.argv[response.argc++] = *help++; + } - snoop_addr.sin_family = AF_INET; - snoop_addr.sin_addr.s_addr = config->snoop_destination_host; - snoop_addr.sin_port = htons(config->snoop_destination_port); + break; - // Update logging - closelog(); - syslog_log = 0; - if (log_stream) - { - fclose(log_stream); - log_stream = NULL; - } - if (*config->log_filename) - { - if (strstr(config->log_filename, "syslog:") == config->log_filename) + case NSCTL_REQ_CONTROL: { - char *p = config->log_filename + 7; - if (*p) + struct param_control param = { + config->cluster_iam_master, + request.argc, + request.argv, + 0, + NULL, + }; + + int r = run_plugins(PLUGIN_CONTROL, ¶m); + + if (r == PLUGIN_RET_ERROR) { - openlog("l2tpns", LOG_PID, facility_value(p)); - syslog_log = 1; + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = param.additional + ? param.additional + : "error returned by plugin"; } - } - else if (strchr(config->log_filename, '/') == config->log_filename) - { - if ((log_stream = fopen((char *)(config->log_filename), "a"))) + else if (r == PLUGIN_RET_NOTMASTER) { - fseek(log_stream, 0, SEEK_END); - setbuf(log_stream, NULL); + 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; + response.argc = 1; + response.argv[0] = param.response + ? "unrecognised response value from plugin" + : "unhandled action"; } else { - log_stream = stderr; - setbuf(log_stream, NULL); + response.type = param.response; + response.argc = 0; + if (param.additional) + { + response.argc = 1; + response.argv[0] = param.additional; + } } } - } - else - { - log_stream = stderr; - setbuf(log_stream, NULL); - } + break; - // Update radius - config->numradiusservers = 0; - for (i = 0; i < MAXRADSERVER; i++) - if (config->radiusserver[i]) config->numradiusservers++; + default: + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = "error unpacking control packet"; + } - if (!config->numradiusservers) + buf = calloc(NSCTL_MAX_PKT_SZ, 1); + if (!buf) { - log(0, 0, 0, 0, "No RADIUS servers defined!\n"); + LOG(2, 0, 0, "Failed to allocate nsctl response\n"); + return; } - config->num_radfds = 2 << RADIUS_SHIFT; - - // Update plugins - for (i = 0; i < MAXPLUGINS; i++) + r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv); + if (r > 0) { - if (strcmp(config->plugins[i], config->old_plugins[i]) == 0) - continue; - if (*config->plugins[i]) - { - // Plugin added - add_plugin(config->plugins[i]); - } - else if (*config->old_plugins[i]) + sendto(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen); + if (log_stream && config->debug >= 4) { - // Plugin removed - remove_plugin(config->old_plugins[i]); + LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0)); + dump_control(&response, log_stream); } } - 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 = 1; - config->reload_config = 0; + else + LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n", + fmtaddr(addr->sin_addr.s_addr, 0), r); + + free(buf); } -void read_config_file() +static tunnelidt new_tunnel() { - FILE *f; - - if (!config->config_file) return; - if (!(f = fopen(config->config_file, "r"))) { - fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno)); - return; + tunnelidt i; + for (i = 1; i < MAXTUNNEL; i++) + { + if (tunnel[i].state == TUNNELFREE) + { + LOG(4, 0, i, "Assigning tunnel ID %d\n", i); + if (i > config->cluster_highest_tunnelid) + config->cluster_highest_tunnelid = i; + return i; + } } - - log(3, 0, 0, 0, "Reading config file %s\n", config->config_file); - cli_do_file(f); - log(3, 0, 0, 0, "Done reading config file\n"); - fclose(f); - update_config(); + LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n"); + return 0; } -int sessionsetup(tunnelidt t, sessionidt s, u8 routes) +// +// We're becoming the master. Do any required setup.. +// +// This is principally telling all the plugins that we're +// now a master, and telling them about all the sessions +// that are active too.. +// +void become_master(void) { - // A session now exists, set it up - ipt ip; - char *user; - sessionidt i; -#ifdef STAT_CALLS - STAT(call_sessionsetup); -#endif - log(3, session[s].ip, s, t, "Doing session setup for session\n"); - if (!session[s].ip) { - log(0, session[s].ip, s, t, "VERY VERY BAD! sessionsetup() called with no session[s].ip\n"); - return 1; - } + int s, i; + static struct event_data d[RADIUS_FDS]; + struct epoll_event e; - // Make sure this is right - session[s].tunnel = t; - // zap old sessions with same IP and/or username - // Don't kill gardened sessions - doing so leads to a DoS - // from someone who doesn't need to know the password - ip = session[s].ip; - user = session[s].user; - for (i = 1; i < MAXSESSION; 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) - sessionkill(i, "Duplicate session for user"); - } + run_plugins(PLUGIN_BECOME_MASTER, NULL); - if (routes) + // running a bunch of iptables commands is slow and can cause + // the master to drop tunnels on takeover--kludge around the + // problem by forking for the moment (note: race) + if (!fork_and_close()) { - if (session[s].route[routes].ip && session[s].route[routes].mask) + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) { - log(2, session[s].ip, s, t, "Routing session\n"); - routeset(session[s].ip, 0, 0, 1); - while (routes--) - routeset(session[s].route[routes].ip, session[s].route[routes].mask, - session[s].ip, 1); + if (!session[s].opened) // Not an in-use session. + continue; + + run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]); } + exit(0); } - sessionsendarp(s); - if (!session[s].sid) - sendipcp(t, s); - - // Force throttling on or off - // This has the advantage of cleaning up after another throttled user who may have left - // firewall rules lying around - session[s].throttle = throttle_session(s, session[s].throttle); + // add radius fds + e.events = EPOLLIN; + for (i = 0; i < RADIUS_FDS; i++) { - struct param_new_session data = { &tunnel[t], &session[s] }; - run_plugins(PLUGIN_NEW_SESSION, &data); + d[i].type = FD_TYPE_RADIUS; + d[i].index = i; + e.data.ptr = &d[i]; + + epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e); } +} - if (!session[s].sid) - session[s].sid = ++last_sid; +int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc) +{ + int s, i; + int count = 0; + int buckets[64]; - cache_sessionid(htonl(session[s].ip), s); + if (CLI_HELP_REQUESTED) + return CLI_HELP_NO_ARGS; - cluster_send_session(s); - session[s].last_packet = time_now; + time(&time_now); + for (i = 0; i < 64;++i) buckets[i] = 0; + + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) { - char *sessionip, *tunnelip; - sessionip = strdup(inet_toa(ntohl(session[s].ip))); - tunnelip = strdup(inet_toa(ntohl(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); - } + int idle; + if (!session[s].opened) + continue; - return 1; // RADIUS OK and IP allocated, done... -} + idle = time_now - session[s].last_packet; + idle /= 5 ; // In multiples of 5 seconds. + if (idle < 0) + idle = 0; + if (idle > 63) + idle = 63; -#ifdef RINGBUFFER -void ringbuffer_dump(FILE *stream) -{ - int i = ringbuffer->head; + ++count; + ++buckets[idle]; + } - while (i != ringbuffer->tail) + for (i = 0; i < 63; ++i) { - if (*ringbuffer->buffer[i].message) - fprintf(stream, "%d-%s", ringbuffer->buffer[i].level, ringbuffer->buffer[i].message); - if (++i == ringbuffer->tail) break; - if (i == RINGBUFFER_SIZE) i = 0; + cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]); } + cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]); + cli_print(cli, "%d total sessions open.", count); + return CLI_OK; } -#endif -void initplugins() +int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc) { - int i; + int s, i; + int count = 0; + int buckets[64]; - loaded_plugins = ll_init(); - // Initialize the plugins to nothing - for (i = 0; i < MAX_PLUGIN_TYPES; i++) - plugins[i] = ll_init(); -} + if (CLI_HELP_REQUESTED) + return CLI_HELP_NO_ARGS; -void add_plugin(char *plugin_name) -{ - void *p; - int (*initfunc)(struct pluginfuncs *); - char path[256] = {0}; - int i; - struct pluginfuncs funcs; - - funcs._log = _log; - funcs._log_hex = _log_hex; - funcs.inet_toa = inet_toa; - funcs.get_session_by_username = sessionbyuser; - funcs.get_session_by_id = sessiontbysessionidt; - funcs.get_id_by_session = sessionidtbysessiont; - funcs.sessionkill = sessionkill; - funcs.radiusnew = radiusnew; - funcs.radiussend = radiussend; - - snprintf(path, 256, "%s/%s.so", LIBDIR, plugin_name); - - log(2, 0, 0, 0, "Loading plugin from %s\n", path); - p = dlopen(path, RTLD_NOW); - if (!p) - { - log(1, 0, 0, 0, " Plugin load failed: %s\n", dlerror()); - return; - } + time(&time_now); + for (i = 0; i < 64;++i) buckets[i] = 0; - if (ll_contains(loaded_plugins, p)) + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) { - dlclose(p); - return; - } + int open = 0, d; + if (!session[s].opened) + continue; - { - int *v = dlsym(p, "__plugin_api_version"); - if (!v || *v != PLUGIN_API_VERSION) + d = time_now - session[s].opened; + if (d < 0) + d = 0; + while (d > 1 && open < 32) { - log(1, 0, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror()); - dlclose(p); - return; + ++open; + d >>= 1; // half. } + ++count; + ++buckets[open]; } - initfunc = dlsym(p, "plugin_init"); - if (!initfunc) - { - log(1, 0, 0, 0, " Plugin load failed: function plugin_init() does not exist: %s\n", dlerror()); - dlclose(p); - return; - } - - if (!initfunc(&funcs)) + s = 1; + for (i = 0; i < 30; ++i) { - log(1, 0, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror()); - dlclose(p); - return; + cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]); + s <<= 1; } + cli_print(cli, "%d total sessions open.", count); + return CLI_OK; +} - for (i = 0; i < max_plugin_functions; i++) +/* Unhide an avp. + * + * 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 void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len) +{ + MD5_CTX ctx; + uint8_t digest[16]; + uint8_t *last; + size_t d = 0; + uint16_t m = htons(type); + + // Compute initial pad + MD5_Init(&ctx); + MD5_Update(&ctx, (unsigned char *) &m, 2); + MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); + MD5_Update(&ctx, vector, vec_len); + MD5_Final(digest, &ctx); + + // pointer to last decoded 16 octets + last = value; + + while (len > 0) { - void *x; - if (!plugin_functions[i]) continue; - if ((x = dlsym(p, plugin_functions[i]))) + // calculate a new pad based on the last decoded block + if (d >= sizeof(digest)) { - log(3, 0, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]); - ll_push(plugins[i], x); + MD5_Init(&ctx); + MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); + MD5_Update(&ctx, last, sizeof(digest)); + MD5_Final(digest, &ctx); + + d = 0; + last = value; } + + *value++ ^= digest[d++]; + len--; } - log(2, 0, 0, 0, " Loaded plugin %s\n", plugin_name); } -void remove_plugin(char *plugin_name) +int find_filter(char const *name, size_t len) { - void *p; - int (*donefunc)(); - char path[256] = {0}; + int free = -1; int i; - snprintf(path, 256, "%s/%s.so", LIBDIR, plugin_name); + for (i = 0; i < MAXFILTER; i++) + { + if (!*ip_filters[i].name) + { + if (free < 0) + free = i; + + continue; + } - log(2, 0, 0, 0, "Removing plugin %s\n", plugin_name); - // Get the existing pointer - p = dlopen(path, RTLD_LAZY); - if (!p) return; + if (strlen(ip_filters[i].name) != len) + continue; - for (i = 0; i < max_plugin_functions; i++) - { - void *x; - if (!plugin_functions[i]) continue; - if ((x = dlsym(p, plugin_functions[i]))) ll_delete(plugins[i], x); + if (!strncmp(ip_filters[i].name, name, len)) + return i; } + + return free; +} - if (ll_contains(loaded_plugins, p)) +static int ip_filter_port(ip_filter_portt *p, uint16_t port) +{ + switch (p->op) { - ll_delete(loaded_plugins, p); - - donefunc = dlsym(p, "plugin_done"); - if (donefunc) donefunc(); + 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; } - dlclose(p); - dlclose(p); - log(2, 0, 0, 0, "Removed plugin %s\n", plugin_name); + return 0; } -int run_plugins(int plugin_type, void *data) +static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags) { - int (*func)(void *data); - if (!plugins[plugin_type] || plugin_type > max_plugin_functions) return 1; - - ll_reset(plugins[plugin_type]); - while ((func = ll_next(plugins[plugin_type]))) + switch (op) { - int rc; - rc = func(data); - if (rc == PLUGIN_RET_STOP) return 1; - if (rc == PLUGIN_RET_ERROR) return 0; + 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 1; + + return 0; } -void processcontrol(u8 * buf, int len, struct sockaddr_in *addr) +int ip_filter(uint8_t *buf, int len, uint8_t filter) { - char *resp; - int l; - struct param_control param = { buf, len, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), NULL, 0, 0 }; + 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; - log(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received "); - if (log_stream) - dump_packet(buf, log_stream); + if ((*buf >> 4) != 4) // IPv4 + return 0; - resp = calloc(1400, 1); - l = new_packet(PKT_RESP_ERROR, resp); - *(int *)(resp + 6) = *(int *)(buf + 6); + 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); - param.type = ntohs(*(short *)(buf + 2)); - param.id = ntohl(*(int *)(buf + 6)); - param.data_length = ntohs(*(short *)(buf + 4)) - 10; - param.data = (param.data_length > 0) ? (char *)(buf + 10) : NULL; - param.response = resp; - param.response_length = l; + 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; - run_plugins(PLUGIN_CONTROL, ¶m); + 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; - if (param.send_response) - { - send_packet(controlfd, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), param.response, param.response_length); - log(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Sent Control packet response\n"); + flags = buf[l + 13] & 0x3f; + } } - free(resp); -} + for (rule = ip_filters[filter].rules; rule->action; rule++) + { + if (rule->proto != IPPROTO_IP && proto != rule->proto) + continue; -/* - * HACK - * Go through all of the tunnels and do some cleanups - */ -void tunnel_clean() -{ - int i; + if (rule->src_wild != INADDR_BROADCAST && + (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild)) + continue; - log(1, 0, 0, 0, "Cleaning tunnels array\n"); + if (rule->dst_wild != INADDR_BROADCAST && + (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild)) + continue; - for (i = 1; i < MAXTUNNEL; i++) - { - if (!tunnel[i].ip - || !*tunnel[i].hostname - || (tunnel[i].state == TUNNELDIE && tunnel[i].die >= time_now)) + if (frag_offset) { - tunnelclear(i); + if (!rule->frag || rule->action == FILTER_ACTION_DENY) + continue; } - } -} + else + { + if (rule->frag) + continue; -void tunnelclear(tunnelidt t) -{ - if (!t) return; - memset(&tunnel[t], 0, sizeof(tunnel[t])); - tunnel[t].state = TUNNELFREE; -} + if (proto == IPPROTO_TCP || proto == IPPROTO_UDP) + { + if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port)) + continue; -tunnelidt new_tunnel() -{ - tunnelidt i; - for (i = 1; i < MAXTUNNEL; i++) - { - if (tunnel[i].state == TUNNELFREE) - { - log(4, 0, 0, i, "Assigning tunnel ID %d\n", i); - return i; + 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; } - log(0, 0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n"); - return 0; -} + // default deny + return 0; +}