X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/272e831e8071da5296e8dd2061f8a166fd70fd07..0bf11bc7fd93e0deafa8b6e09f89be30bf5fb824:/l2tpns.c?ds=sidebyside diff --git a/l2tpns.c b/l2tpns.c index eb7783b..808464d 100644 --- a/l2tpns.c +++ b/l2tpns.c @@ -1,10 +1,10 @@ // L2TP Network Server // Adrian Kennard 2002 -// Copyright (c) 2003, 2004 Optus Internet Engineering +// Copyright (c) 2003, 2004, 2005 Optus Internet Engineering // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced // vim: sw=8 ts=8 -char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.25 2004/09/02 04:18:07 fred_nerk Exp $"; +char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.73.2.15 2005/05/31 12:09:33 bodea Exp $"; #include #include @@ -23,6 +23,7 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.25 2004/09/02 04:18:07 fred_nerk #include #include #include +#include #include #include #include @@ -48,50 +49,48 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.25 2004/09/02 04:18:07 fred_nerk #include "util.h" #include "tbf.h" +#ifdef BGP +#include "bgp.h" +#endif /* BGP */ + // Globals -struct configt *config = NULL; // all configuration +configt *config = NULL; // all configuration int tunfd = -1; // tun interface file handle. (network device) int udpfd = -1; // UDP file handle int controlfd = -1; // Control signal handle +int clifd = -1; // Socket listening for CLI connections. int 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 time_t basetime = 0; // base clock char hostname[1000] = ""; // us. -int tunidx; // ifr_ifindex of tun device -u32 sessionid = 0; // session id for radius accounting -int syslog_log = 0; // are we logging to syslog -FILE *log_stream = NULL; // file handle for direct logging (i.e. direct into file, not via syslog). +static uint32_t sessionid = 0; // session id for radius accounting +static int syslog_log = 0; // are we logging to syslog +static FILE *log_stream = NULL; // file handle for direct logging (i.e. direct into file, not via syslog). extern int cluster_sockfd; // Intra-cluster communications socket. -u32 last_id = 0; // Last used PPP SID. Can I kill this?? -- mo -int clifd = 0; // Socket listening for CLI connections. +uint32_t last_id = 0; // Last used PPP SID. Can I kill this?? -- mo 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. -u32 udp_tx = 0, udp_rx = 0, udp_rx_pkt = 0; // Global traffic counters. -u32 eth_tx = 0, eth_rx = 0, eth_rx_pkt = 0; -u32 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. -char time_now_string[64] = {0}; // Current time as a string. -char main_quit = 0; // True if we're in the process of exiting. -char *_program_name = NULL; +// 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]; -#ifdef BGP -#include "bgp.h" -struct bgp_peer *bgp_peers = 0; -struct bgp_route_list *bgp_routes = 0; -int bgp_configured = 0; -#endif /* BGP */ - #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), @@ -101,36 +100,32 @@ struct config_descriptt config_values[] = { CONFIG("save_state", save_state, BOOL), CONFIG("primary_radius", radiusserver[0], IP), CONFIG("secondary_radius", radiusserver[1], IP), - CONFIG("primary_radius_port",radiusport[0], SHORT), - CONFIG("secondary_radius_port",radiusport[1], SHORT), + CONFIG("primary_radius_port", radiusport[0], SHORT), + CONFIG("secondary_radius_port", radiusport[1], SHORT), CONFIG("radius_accounting", radius_accounting, BOOL), CONFIG("radius_secret", radiussecret, STRING), CONFIG("bind_address", bind_address, IP), + CONFIG("peer_address", peer_address, IP), 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, IP), CONFIG("cluster_interface", cluster_interface, STRING), CONFIG("cluster_hb_interval", cluster_hb_interval, INT), CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT), -#ifdef BGP - CONFIG("as_number", as_number, SHORT), - CONFIG("bgp_peer1", bgp_peer[0], STRING), - CONFIG("bgp_peer1_as", bgp_peer_as[0], SHORT), - CONFIG("bgp_peer2", bgp_peer[1], STRING), - CONFIG("bgp_peer2_as", bgp_peer_as[1], SHORT), -#endif /* BGP */ + CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT), { NULL, 0, 0, 0 }, }; -char *plugin_functions[] = { +static char *plugin_functions[] = { NULL, "plugin_pre_auth", "plugin_post_auth", @@ -147,54 +142,70 @@ char *plugin_functions[] = { #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *)) +// Counters for shutdown sessions +static sessiont shut_acct[8192]; +static sessionidt shut_acct_n = 0; + tunnelt *tunnel = NULL; // Array of tunnel structures. sessiont *session = NULL; // Array of session structures. -sessioncountt *sess_count = NULL; // Array of partial per-session traffic counters. +sessionlocalt *sess_local = NULL; // Array of local per-session counters. radiust *radius = NULL; // Array of radius structures. ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses. -controlt *controlfree = 0; +ip_filtert *ip_filters = NULL; // Array of named filters. +static controlt *controlfree = 0; struct Tstats *_statistics = NULL; #ifdef RINGBUFFER struct Tringbuffer *ringbuffer = NULL; #endif -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(); - -static void cache_ipmap(ipt ip, int s); -static void uncache_ipmap(ipt ip); - -// return internal time (10ths since process startup) -clockt now(void) +static void cache_ipmap(in_addr_t ip, int s); +static void uncache_ipmap(in_addr_t ip); +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 sigterm_handler(int sig); +static void sigquit_handler(int sig); +static void sigchild_handler(int sig); +static void read_state(void); +static void dump_state(void); +static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **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 int unhide_avp(uint8_t *avp, tunnelidt t, sessionidt s, uint16_t length); + +// on slaves, alow BGP to withdraw cleanly before exiting +#define QUIT_DELAY 5 + +// 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 // This is a straight bounded exponential backoff. // Maximum re-try time is 32 seconds. (2^5). -clockt backoff(u8 try) +clockt backoff(uint8_t try) { if (try > 5) try = 5; // max backoff - return now() + 10 * (1 << try); + return now(NULL) + 10 * (1 << try); } // -// Log a debug message. +// Log a debug message. Typically called via the LOG macro // -void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...) +void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) { static char message[65536] = {0}; static char message2[65536] = {0}; @@ -210,7 +221,6 @@ 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); @@ -237,17 +247,17 @@ void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, 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 char *data, int maxsize) { int i, j; - const u8 *d = (const u8 *)data; + const uint8_t *d = (const uint8_t *) 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; ) @@ -292,12 +302,12 @@ void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *tit // Add a route // // This adds it to the routing table, advertises it -// via iBGP if enabled, and stuffs it into the +// via BGP if enabled, and stuffs it into the // 'sessionbyip' cache. // // 'ip' and 'mask' must be in _host_ order. // -void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add) +static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, int add) { struct rtentry r; int i; @@ -309,25 +319,23 @@ void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add) memset(&r, 0, sizeof(r)); r.rt_dev = config->tundevice; r.rt_dst.sa_family = AF_INET; - *(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); + *(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask); r.rt_flags = (RTF_UP | RTF_STATIC); if (gw) r.rt_flags |= RTF_GATEWAY; else if (mask == 0xffffffff) r.rt_flags |= RTF_HOST; - log(1, ip, 0, 0, "Route %s %u.%u.%u.%u/%u.%u.%u.%u %u.%u.%u.%u\n", - add ? "add" : "del", - ip >> 24, ip >> 16 & 0xff, ip >> 8 & 0xff, ip & 0xff, - mask >> 24, mask >> 16 & 0xff, mask >> 8 & 0xff, mask & 0xff, - gw >> 24, gw >> 16 & 0xff, gw >> 8 & 0xff, gw & 0xff); + LOG(1, s, 0, "Route %s %s/%s%s%s\n", add ? "add" : "del", + fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1), + gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : ""); if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0) - log(0, 0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno)); + LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno)); #ifdef BGP if (add) @@ -337,7 +345,7 @@ void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add) #endif /* BGP */ // Add/Remove the IPs to the 'sessionbyip' cache. - // Note that we add the zero address in the case of + // 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. @@ -356,7 +364,7 @@ void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add) // // Set up TUN interface -void inittun(void) +static void inittun(void) { struct ifreq ifr; struct sockaddr_in sin = {0}; @@ -366,7 +374,7 @@ void inittun(void) tunfd = open(TUNDEVICE, O_RDWR); if (tunfd < 0) { // fatal - log(0, 0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno)); + LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno)); exit(1); } { @@ -375,7 +383,7 @@ void inittun(void) } if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0) { - log(0, 0, 0, 0, "Can't set tun interface: %s\n", strerror(errno)); + LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno)); exit(1); } assert(strlen(ifr.ifr_name) < sizeof(config->tundevice)); @@ -388,32 +396,26 @@ void inittun(void) if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0) { - log(0, 0, 0, 0, "Error setting tun address: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno)); exit(1); } /* Bump up the qlen to deal with bursts from the network */ ifr.ifr_qlen = 1000; if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0) { - log(0, 0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno)); exit(1); } ifr.ifr_flags = IFF_UP; if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0) { - log(0, 0, 0, 0, "Error setting tun flags: %s\n", strerror(errno)); - exit(1); - } - if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0) - { - log(0, 0, 0, 0, "Error setting tun ifindex: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno)); exit(1); } - tunidx = ifr.ifr_ifindex; } // set up UDP port -void initudp(void) +static void initudp(void) { int on = 1; struct sockaddr_in addr; @@ -431,7 +433,7 @@ void initudp(void) } if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0) { - log(0, 0, 0, 0, "Error in UDP bind: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno)); exit(1); } snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); @@ -439,12 +441,12 @@ void initudp(void) // 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) { - log(0, 0, 0, 0, "Error in control bind: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno)); exit(1); } } @@ -464,27 +466,26 @@ void initudp(void) // IP address. // -int lookup_ipmap(ipt ip) +static int lookup_ipmap(in_addr_t ip) { - u8 *a = (u8 *)&ip; - char **d = (char **) ip_hash; - int s; + uint8_t *a = (uint8_t *) &ip; + uint8_t **d = (uint8_t **) ip_hash; - 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; + 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; - s = (ipt) d[(size_t) *a]; - return s; + return (int) (intptr_t) d[(size_t) *a]; } -sessionidt sessionbyip(ipt ip) +sessionidt sessionbyip(in_addr_t ip) { int s = lookup_ipmap(ip); CSTAT(call_sessionbyip); - if (s > 0 && s < MAXSESSION && session[s].tunnel) - return s; + if (s > 0 && s < MAXSESSION && session[s].opened) + return (sessionidt) s; + return 0; } @@ -494,34 +495,35 @@ sessionidt sessionbyip(ipt ip) // // (It's actually cached in network order) // -static void cache_ipmap(ipt ip, int s) +static void cache_ipmap(in_addr_t ip, int s) { - ipt nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char*)(&ip))[0] - u8 *a = (u8 *) &nip; - char **d = (char **) ip_hash; + in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0] + uint8_t *a = (uint8_t *) &nip; + uint8_t **d = (uint8_t **) ip_hash; int i; for (i = 0; i < 3; i++) { if (!d[(size_t) a[i]]) { - 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]]; } - d[(size_t) a[3]] = (char *)((int)s); + d[(size_t) a[3]] = (uint8_t *) (intptr_t) s; if (s > 0) - log(4, ip, s, session[s].tunnel, "Caching ip address %s\n", inet_toa(nip)); + LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0)); + else if (s == 0) - log(4, ip, 0, 0, "Un-caching ip address %s\n", inet_toa(nip)); + LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0)); // else a map to an ip pool index. } -static void uncache_ipmap(ipt ip) +static void uncache_ipmap(in_addr_t ip) { cache_ipmap(ip, 0); // Assign it to the NULL session. } @@ -544,22 +546,22 @@ int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc) { if (!d[i]) continue; - e = (char**) d[i]; + e = (char **) d[i]; for (j = 0; j < 256; ++j) { if (!e[j]) continue; - f = (char**) e[j]; + f = (char **) e[j]; for (k = 0; k < 256; ++k) { if (!f[k]) continue; - g = (char**)f[k]; + g = (char **)f[k]; for (l = 0; l < 256; ++l) { if (!g[l]) continue; - cli_print(cli, "%7d %d.%d.%d.%d", (int) g[l], i, j, k, l); + cli_print(cli, "%7d %d.%d.%d.%d", (int) (intptr_t) g[l], i, j, k, l); ++count; } } @@ -581,8 +583,11 @@ sessionidt sessionbyuser(char *username) int s; CSTAT(call_sessionbyuser); - for (s = 1; s < MAXSESSION ; ++s) + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) { + if (!session[s].opened) + continue; + if (session[s].walled_garden) continue; // Skip walled garden users. @@ -593,30 +598,30 @@ sessionidt sessionbyuser(char *username) return 0; // Not found. } -void send_garp(ipt ip) +void send_garp(in_addr_t ip) { int s; struct ifreq ifr; - u8 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; } @@ -624,22 +629,21 @@ 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; } // 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; @@ -648,7 +652,7 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t) 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; @@ -657,18 +661,19 @@ 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) @@ -678,19 +683,19 @@ 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); } @@ -699,37 +704,37 @@ void tunnelsend(u8 * buf, u16 l, tunnelidt t) // Tiny helper function to write data to // the 'tun' device. // -int tun_write(u8 * data, int size) +int tun_write(uint8_t * data, int size) { return write(tunfd, data, size); } // 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; + in_addr_t ip; - char * data = buf; // Keep a copy of the originals. + char *data = buf; // Keep a copy of the originals. int size = len; - u8 b[MAXETHER + 20]; + uint8_t b[MAXETHER + 20]; CSTAT(call_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, 0, "Oversize IP packet %d bytes\n", len); - STAT(tunnel_tx_errors); + LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len); + STAT(tun_rx_errors); return; } @@ -738,13 +743,13 @@ 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))) { // Is this a packet for a session that doesn't exist? @@ -759,14 +764,57 @@ void processipout(u8 * buf, int len) if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second. { - log(4, 0, 0, 0, "IP: Sending ICMP host unreachable to %s\n", inet_toa(*(u32 *)(buf + 12))); - host_unreachable(*(u32 *)(buf + 12), *(u16 *)(buf + 4), ip, buf, (len < 64) ? 64 : len); + LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0)); + host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4), ip, buf, (len < 64) ? 64 : len); } return; } t = session[s].tunnel; sp = &session[s]; + // DoS prevention: enforce a maximum number of packets per 0.1s for a session + if (config->max_packets > 0) + { + if (sess_local[s].last_packet_out == TIME) + { + int max = config->max_packets; + + // All packets for throttled sessions are handled by the + // master, so further limit by using the throttle rate. + // A bit of a kludge, since throttle rate is in kbps, + // but should still be generous given our average DSL + // packet size is 200 bytes: a limit of 28kbps equates + // to around 180 packets per second. + if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max) + max = sp->throttle_out; + + if (++sess_local[s].packets_out > max) + { + sess_local[s].packets_dropped++; + return; + } + } + else + { + if (sess_local[s].packets_dropped) + { + INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped); + LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n", + sess_local[s].packets_dropped, sess_local[s].packets_out, + fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "", + sp->user); + } + + sess_local[s].last_packet_out = TIME; + sess_local[s].packets_out = 1; + sess_local[s].packets_dropped = 0; + } + } + + // run access-list if any + if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1)) + return; + if (sp->tbf_out) { // Are we throttling this session? @@ -783,45 +831,41 @@ void processipout(u8 * buf, int len) return; } - // 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); - - 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, sizeof(b), buf, len, t, s, PPPIP); - if (!p) - { - log(3, session[s].ip, s, t, "failed to send packet in processipout.\n"); - return; - } + uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP); + if (!p) return; tunnelsend(b, len + (p-b), t); // send it... } + // Snooping this session, send it to intercept box + if (sp->snoop_ip && sp->snoop_port) + snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port); + sp->cout += len; // byte count sp->total_cout += len; // byte count sp->pout++; udp_tx += len; - sess_count[s].cout += len; // To send to master.. + sess_local[s].cout += len; // To send to master.. } // // Helper routine for the TBF filters. // Used to send queued data in to the user! // -void send_ipout(sessionidt s, u8 *buf, int len) +static void send_ipout(sessionidt s, uint8_t *buf, int len) { sessiont *sp; tunnelidt t; - ipt ip; + in_addr_t ip; - u8 b[MAXETHER + 20]; + uint8_t b[MAXETHER + 20]; if (len < 0 || len > MAXETHER) { - log(1,0,0,0, "Odd size IP packet: %d bytes\n", len); + LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len); return; } @@ -829,82 +873,80 @@ void send_ipout(sessionidt s, u8 *buf, int len) buf += 4; len -= 4; - ip = *(u32 *)(buf + 16); + ip = *(in_addr_t *)(buf + 16); if (!session[s].ip) return; + t = session[s].tunnel; sp = &session[s]; - log(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len); - - // Snooping this session. - if (sp->snoop_ip && sp->snoop_port) - snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port); + LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len); // Add on L2TP header { - u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP); - if (!p) - { - log(3, session[s].ip, s, t, "failed to send packet in send_ipout.\n"); - return; - } + uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, 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); + sp->cout += len; // byte count sp->total_cout += len; // byte count sp->pout++; udp_tx += len; - sess_count[s].cout += len; // To send to master.. + sess_local[s].cout += len; // To send to master.. } // add an AVP (16 bit) -void control16(controlt * c, u16 avp, u16 val, u8 m) +static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m) { - u16 l = (m ? 0x8008 : 0x0008); - *(u16 *) (c->buf + c->length + 0) = htons(l); - *(u16 *) (c->buf + c->length + 2) = htons(0); - *(u16 *) (c->buf + c->length + 4) = htons(avp); - *(u16 *) (c->buf + c->length + 6) = htons(val); + uint16_t l = (m ? 0x8008 : 0x0008); + *(uint16_t *) (c->buf + c->length + 0) = htons(l); + *(uint16_t *) (c->buf + c->length + 2) = htons(0); + *(uint16_t *) (c->buf + c->length + 4) = htons(avp); + *(uint16_t *) (c->buf + c->length + 6) = htons(val); c->length += 8; } // add an AVP (32 bit) -void control32(controlt * c, u16 avp, u32 val, u8 m) +static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m) { - u16 l = (m ? 0x800A : 0x000A); - *(u16 *) (c->buf + c->length + 0) = htons(l); - *(u16 *) (c->buf + c->length + 2) = htons(0); - *(u16 *) (c->buf + c->length + 4) = htons(avp); - *(u32 *) (c->buf + c->length + 6) = htonl(val); + uint16_t l = (m ? 0x800A : 0x000A); + *(uint16_t *) (c->buf + c->length + 0) = htons(l); + *(uint16_t *) (c->buf + c->length + 2) = htons(0); + *(uint16_t *) (c->buf + c->length + 4) = htons(avp); + *(uint32_t *) (c->buf + c->length + 6) = htonl(val); c->length += 10; } // add an AVP (32 bit) -void controls(controlt * c, u16 avp, char *val, u8 m) +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, char *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) @@ -916,7 +958,7 @@ 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; @@ -924,36 +966,38 @@ controlt *controlnew(u16 mtype) // send zero block if nothing is waiting // (ZLB send). -void controlnull(tunnelidt t) +static void controlnull(tunnelidt t) { - u8 buf[12]; + 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, tunnelidt t, sessionidt s) { - *(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(s ? session[s].far : 0); // 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) { @@ -965,102 +1009,118 @@ void controladd(controlt * c, tunnelidt t, sessionidt s) // // Throttle or Unthrottle a session // -// Throttle the data folling through a session -// to be no more than 'throttle' kbit/sec each way. +// 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. // -int throttle_session(sessionidt s, int throttle) +void throttle_session(sessionidt s, int rate_in, int rate_out) { - if (!session[s].tunnel) - return 0; // No-one home. + if (!session[s].opened) + return; // No-one home. if (!*session[s].user) - return 0; // User not logged in + return; // User not logged in - if (throttle) + if (rate_in >= 0) { - int rate_in = throttle & 0x0000FFFF; - int rate_out = throttle >> 16; + int bytes = rate_in * 1024 / 8; // kbits to bytes + if (session[s].tbf_in) + free_tbf(session[s].tbf_in); - if (session[s].tbf_in || session[s].tbf_out) - { - if (throttle == session[s].throttle) - return 1; + if (rate_in > 0) + session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin); + else + session[s].tbf_in = 0; - // Currently throttled but the rate is changing. + session[s].throttle_in = rate_in; + } - free_tbf(session[s].tbf_in); + if (rate_out >= 0) + { + int bytes = rate_out * 1024 / 8; + if (session[s].tbf_out) free_tbf(session[s].tbf_out); - } - if (rate_in) session[s].tbf_in = new_tbf(s, rate_in * 1024 / 4, rate_in * 1024 / 8, send_ipin); - if (rate_out) session[s].tbf_out = new_tbf(s, rate_out * 1024 / 4, rate_out * 1024 / 8, send_ipout); - - if (throttle != session[s].throttle) - { - // Changed. Flood to slaves. - session[s].throttle = throttle; - cluster_send_session(s); - } + if (rate_out > 0) + session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout); + else + session[s].tbf_out = 0; - return 1; + session[s].throttle_out = rate_out; } +} - // else Unthrottling. - - if (!session[s].tbf_in && !session[s].tbf_out && !session[s].throttle) - return 0; +// 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. - free_tbf(session[s].tbf_in); - session[s].tbf_in = 0; + if (!*session[s].user) + return; // User not logged in - free_tbf(session[s].tbf_out); - session[s].tbf_out = 0; + // 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 (throttle != session[s].throttle) + if (filter_in >= 0) { - // Changed. Flood to slaves. - session[s].throttle = throttle; - cluster_send_session(s); + 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; } - return 0; + 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) { - int dead = session[s].die; int walled_garden = session[s].walled_garden; CSTAT(call_sessionshutdown); - if (!session[s].tunnel) + if (!session[s].opened) { - log(3, session[s].ip, s, session[s].tunnel, "Called sessionshutdown on a session with no tunnel.\n"); + LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n"); return; // not a live session } - if (!dead) - 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 - + if (!session[s].die) { 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) + if (session[s].ip && !walled_garden && !session[s].die) { - u16 r = session[s].radius; + // RADIUS Stop message + uint16_t r = session[s].radius; if (!r) { if (!(r = radiusnew(s))) { - log(1, 0, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n"); - STAT(radius_overflow); + LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n"); } else { @@ -1069,50 +1129,75 @@ void sessionshutdown(sessionidt s, char *reason) radius[r].auth[n] = rand(); } } + if (r && radius[r].state != RADIUSSTOP) radiussend(r, RADIUSSTOP); // stop, if not already trying + + // Save counters to dump to accounting file + if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct)) + memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s])); } if (session[s].ip) { // IP allocated, clear and unroute int r; + int routed = 0; for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++) { - routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].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 { - routeset(s, session[s].ip, 0, 0, 0); // Delete route. + if (!routed) routeset(s, session[s].ip, 0, 0, 0); session[s].ip = 0; } else free_ip_address(s); - - if (session[s].throttle) // Unthrottle if throttled. - throttle_session(s, 0); } + + if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled. + throttle_session(s, 0, 0); + { // Send CDN controlt *c = controlnew(14); // sending CDN control16(c, 1, 3, 1); // result code (admin reasons - TBA make error, general error, add message control16(c, 14, s, 1); // assigned session (our end) controladd(c, session[s].tunnel, s); // 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--; + cluster_send_session(s); } void sendipcp(tunnelidt t, sessionidt s) { - u8 buf[MAXCONTROL]; - u16 r = session[s].radius; - u8 *q; + uint8_t buf[MAXCONTROL]; + uint16_t r = session[s].radius; + uint8_t *q; CSTAT(call_sendipcp); if (!r) r = radiusnew(s); + if (!r) + { + sessionshutdown(s, "No free RADIUS sessions for IPCP"); + return; + } + if (radius[r].state != RADIUSIPCP) { radius[r].state = RADIUSIPCP; @@ -1128,47 +1213,66 @@ void sendipcp(tunnelidt t, sessionidt s) } q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP); - if (!q) - { - log(3, session[s].ip, s, t, "failed to send packet in sendipcp.\n"); - return; - } + 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[1] = r >> RADIUS_SHIFT; // ID, dont care, we only send one type of request + *(uint16_t *) (q + 2) = htons(10); q[4] = 3; q[5] = 6; - *(u32 *) (q + 6) = config->bind_address ? config->bind_address : my_address; // send my IP + *(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 session[s].flags &= ~SF_IPCP_ACKED; // Clear flag. } +static void sessionclear(sessionidt s) +{ + memset(&session[s], 0, sizeof(session[s])); + memset(&sess_local[s], 0, sizeof(sess_local[s])); + memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s])); + + session[s].tunnel = T_FREE; // Mark it as free. + session[s].next = sessionfree; + sessionfree = s; +} + // kill a session now void sessionkill(sessionidt s, char *reason) { CSTAT(call_sessionkill); - session[s].die = now(); + 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); // close radius/routes, etc. if (session[s].radius) radiusclear(session[s].radius, s); // cant send clean accounting data, session is killed - log(2, 0, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason); - - throttle_session(s, 0); // Force session to be un-throttle. Free'ing TBF structures. - - memset(&session[s], 0, sizeof(session[s])); - session[s].tunnel = T_FREE; // Mark it as free. - session[s].next = sessionfree; - sessionfree = s; - cli_session_actions[s].action = 0; + 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; @@ -1187,19 +1291,19 @@ 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, 0, t, "Kill tunnel %d: %s\n", t, reason); + LOG(1, 0, t, "Kill tunnel %d: %s\n", t, reason); cli_tunnel_actions[s].action = 0; cluster_send_tunnel(t); } // shut down a tunnel cleanly -void tunnelshutdown(tunnelidt t, char *reason) +static void tunnelshutdown(tunnelidt t, char *reason) { sessionidt s; @@ -1211,105 +1315,105 @@ void tunnelshutdown(tunnelidt t, char *reason) 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); 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, 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 } } // 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; + uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0; + uint8_t *p = buf + 2; CSTAT(call_processudp); 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"); + 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 + uint16_t message = 0xFFFF; // message type + uint8_t fatal = 0; + uint8_t mandatorymessage = 0; + uint8_t chap = 0; // if CHAP being used + 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) + int requestchap = 0; // do we request PAP instead of original CHAP request? + char called[MAXTEL] = ""; // called number + char calling[MAXTEL] = ""; // calling number if (!config->cluster_iam_master) { @@ -1319,14 +1423,13 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) if ((*buf & 0xCA) != 0xC8) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "Bad control header %02X\n", *buf); + LOG(1, s, t, "Bad control header %02X\n", *buf); STAT(tunnel_rx_errors); return; } - log(3, ntohl(addr->sin_addr.s_addr), s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n", - l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr); - // if no tunnel specified, assign one - if (!t) + + // check for duplicate tunnel open message + if (!t && ns == 0) { int i; @@ -1336,28 +1439,52 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) for (i = 1; i <= config->cluster_highest_tunnelid ; ++i) { if (tunnel[i].state != TUNNELOPENING || - tunnel[i].ip != ntohl(*(ipt *) & addr->sin_addr) || + tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) || tunnel[i].port != ntohs(addr->sin_port) ) continue; t = i; + 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 @@ -1367,7 +1494,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) { int skip = tunnel[t].window; // track how many in-window packets are still in queue // some to clear maybe? - while (tunnel[t].controlc && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000)) + while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000)) { controlt *c = tunnel[t].controls; tunnel[t].controls = c->next; @@ -1378,22 +1505,6 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) tunnel[t].try = 0; // we have progress } - // If the 'ns' just received is not the 'nr' we're - // expecting, just send an ack and drop it. - // - // if 'ns' is less, then we got a retransmitted packet. - // if 'ns' is greater than missed a packet. Either way - // we should ignore it. - if (ns != tunnel[t].nr) - { - // is this the sequence we were expecting? - log(1, ntohl(addr->sin_addr.s_addr), 0, t, " Out of sequence tunnel %d, (%d is not the expected %d)\n", t, ns, tunnel[t].nr); - STAT(tunnel_rx_errors); - - if (l) // Is this not a ZLB? - controlnull(t); - return; - } // receiver advance (do here so quoted correctly in any sends below) if (l) tunnel[t].nr = (ns + 1); if (skip < 0) skip = 0; @@ -1423,14 +1534,14 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // process AVPs while (l && !(fatal & 0x80)) { - u16 n = (ntohs(*(u16 *) p) & 0x3FF); - u8 *b = p; - u8 flags = *p; - u16 mtype; + uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF); + uint8_t *b = p; + uint8_t flags = *p; + uint16_t mtype; p += n; // next if (l < n) { - 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; @@ -1441,48 +1552,54 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // 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; 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; + continue; + } + LOG(4, s, t, "Hidden AVP\n"); + // Unhide the AVP + n = unhide_avp(b, t, s, n); + if (n == 0) + { fatal = flags; 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); + LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b); fatal = flags; continue; // next } b += 2; - if (*(u16 *) (b)) + if (*(uint16_t *) (b)) { - log(2, ntohl(addr->sin_addr.s_addr), s, t, "Unknown AVP vendor %d\n", ntohs(*(u16 *) (b))); + LOG(2, s, t, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b))); fatal = flags; continue; // next } b += 2; - mtype = ntohs(*(u16 *) (b)); + mtype = ntohs(*(uint16_t *) (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\n", mtype, avpnames[mtype], n); 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]); + message = ntohs(*(uint16_t *) b); + LOG(4, s, t, " Message type = %d (%s)\n", *b, l2tp_message_types[message]); mandatorymessage = flags; 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 */ @@ -1495,108 +1612,109 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) resdesc = cdn_result_codes[rescode]; } - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Result Code %d: %s\n", - rescode, resdesc); + LOG(4, s, t, " Result Code %d: %s\n", rescode, resdesc); if (n >= 4) { - u16 errcode = ntohs(*(u16 *)(b + 2)); + uint16_t errcode = ntohs(*(uint16_t *)(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); + LOG(4, s, t, " Error Code %d: %s\n", errcode, errdesc); } if (n > 4) - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Error String: %.*s\n", - n-4, b+4); + LOG(4, s, t, " Error String: %.*s\n", n-4, b+4); break; } break; case 2: // protocol version { - 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; 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); + LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname); // TBA - to send to RADIUS break; case 8: // vendor name memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor)); memcpy(tunnel[t].vendor, b, (n >= sizeof(tunnel[t].vendor) - 1) ? sizeof(tunnel[t].vendor) - 1 : n); - log(4, ntohl(addr->sin_addr.s_addr), s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor); + 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); + 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); + 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 { @@ -1605,13 +1723,12 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) memcpy(tmp, b, (n >= 30) ? 30 : n); session[s].tx_connect_speed = atol(tmp); } - log(4, ntohl(addr->sin_addr.s_addr), s, t, " TX connect speed <%u>\n", - session[s].tx_connect_speed); + LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed); break; case 38: // rx connect speed if (n == 4) { - session[s].rx_connect_speed = ntohl(*(u32 *)b); + session[s].rx_connect_speed = ntohl(*(uint32_t *)b); } else { @@ -1620,20 +1737,18 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) memcpy(tmp, b, (n >= 30) ? 30 : n); session[s].rx_connect_speed = atol(tmp); } - log(4, ntohl(addr->sin_addr.s_addr), s, t, " RX connect speed <%u>\n", - session[s].rx_connect_speed); + LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed); break; case 25: // Physical Channel ID { - 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]); + uint16_t authtype = ntohs(*(uint16_t *)b); + LOG(4, s, t, " Proxy Auth Type %d (%s)\n", authtype, authtypes[authtype]); requestchap = (authtype == 2); break; } @@ -1641,21 +1756,20 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) { 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", + 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); + uint16_t authid = ntohs(*(uint16_t *)(b)); + LOG(4, s, t, " Proxy Auth ID (%d)\n", authid); if (session[s].radius) radius[session[s].radius].id = authid; break; @@ -1664,56 +1778,40 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) { 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"); + LOG(4, s, t, " Proxy Auth Response\n"); break; } case 27: // last send 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) + if (*p == 5 && p[1] == 6) // Magic-Number + amagic = ntohl(*(uint32_t *) (p + 2)); + else if (*p == 3 && p[1] == 5 && *(uint16_t *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol chap = 1; - else if (*p == 7) + 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)); 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); + LOG(2, s, t, " Unknown AVP type %d\n", mtype); fatal = flags; continue; // next } @@ -1764,11 +1862,12 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) if (!sessionfree) { STAT(session_overflow); - tunnelshutdown(t, "No free sessions"); + LOG(1, 0, t, "No free sessions\n"); + return; } else { - u16 r; + uint16_t r; controlt *c; s = sessionfree; @@ -1781,18 +1880,18 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) // make a RADIUS session if (!(r = radiusnew(s))) { - log(1, ntohl(addr->sin_addr.s_addr), s, t, "No free RADIUS sessions for ICRQ\n"); - sessionkill(s, "no free RADIUS sesions"); + LOG(1, s, t, "No free RADIUS sessions for ICRQ\n"); + sessionclear(s); return; } c = controlnew(11); // sending ICRP session[s].id = sessionid++; - session[s].opened = time(NULL); + session[s].opened = time_now; session[s].tunnel = t; session[s].far = asession; session[s].last_packet = time_now; - 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 { @@ -1814,7 +1913,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) if (amagic == 0) amagic = time_now; session[s].magic = amagic; // set magic number session[s].l2tp_flags = aflags; // set flags received - log(3, ntohl(addr->sin_addr.s_addr), s, t, "Magic %X Flags %X\n", amagic, aflags); + LOG(3, s, t, "Magic %X Flags %X\n", amagic, aflags); controlnull(t); // ack // In CHAP state, request PAP instead if (requestchap) @@ -1825,14 +1924,14 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) sessionshutdown(s, "Closed (Received CDN)"); 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"); 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); @@ -1840,14 +1939,14 @@ 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); + LOG_HEX(5, "Receive Tunnel Data", p, l); if (l > 2 && p[0] == 0xFF && p[1] == 0x03) { // HDLC address header, discard p += 2; @@ -1855,7 +1954,7 @@ 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; } @@ -1866,12 +1965,12 @@ 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].tunnel) // Is something wrong?? + if (s && !session[s].opened) // Is something wrong?? { if (!config->cluster_iam_master) { @@ -1880,20 +1979,11 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) return; } - - log(1, ntohl(addr->sin_addr.s_addr), s, t, "UDP packet contains session %d " - "but no session[%d].tunnel exists (LAC said" - " tunnel = %d). Dropping packet.\n", s, s, t); + LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n"); STAT(tunnel_rx_errors); return; } - 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); -// I'm pretty sure this isn't right -- mo. -// return; // closing session, PPP not processed - } if (prot == PPPPAP) { session[s].last_packet = time_now; @@ -1926,41 +2016,33 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) } else if (prot == PPPIP) { - if (!config->cluster_iam_master) + if (session[s].die) { - // We're a slave. Should we forward this packet to the master? - - // Is this a walled garden session, or something that needs it's - // idle time updated?? + LOG(4, s, t, "Session %d is closing. Don't process PPP packets\n", s); + return; // closing session, PPP not processed + } - // Maintain the idle timeouts on the master. If this would - // significantly reset the idletimeout, run it via the master - // to refresh the master's idle timer. - // Not sure this is ideal: It may re-order packets. + 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; + } - if (session[s].walled_garden || (session[s].last_packet + (ECHO_TIMEOUT/2)) < time_now) - { - master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); - session[s].last_packet = time_now; - return; - } - // fall through to processipin. - } else - session[s].last_packet = time_now; processipin(t, s, 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 tun -void processtun(u8 * buf, int len) +static void processtun(uint8_t * buf, int len) { - log_hex(5, "Receive TUN Data", buf, len); + LOG_HEX(5, "Receive TUN Data", buf, len); STAT(tun_rx_packets); INC_STAT(tun_rx_bytes, len); @@ -1970,51 +2052,71 @@ void processtun(u8 * buf, int len) eth_rx += len; if (len < 22) { - log(1, 0, 0, 0, "Short tun packet %d bytes\n", len); + LOG(1, 0, 0, "Short tun packet %d bytes\n", len); STAT(tun_rx_errors); return; } - if (*(u16 *) (buf + 2) == htons(PKTIP)) // IP + if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IP processipout(buf, len); // Else discard. } -// -// Maximum number of actions to complete. -// This is to avoid sending out too many packets -// at once. -#define MAX_ACTIONS 500 - -int regular_cleanups(void) +// Handle retries, timeouts. Runs every 1/10th sec, want to ensure +// that we look at the whole of the tunnel, radius and session tables +// every second +static void regular_cleanups(double period) { - static sessionidt s = 0; // Next session to check for actions on. - tunnelidt t; - int count=0,i; - u16 r; - static clockt next_acct = 0; + // Next tunnel, radius and session to check for actions on. + static tunnelidt t = 0; + static int r = 0; + static sessionidt s = 0; + + int t_actions = 0; + int r_actions = 0; + int s_actions = 0; + + int t_slice; + int r_slice; + int s_slice; + + int i; int a; - log(3, 0, 0, 0, "Begin regular cleanup\n"); + // divide up tables into slices based on the last run + t_slice = config->cluster_highest_tunnelid * period; + r_slice = (MAXRADIUS - 1) * period; + s_slice = config->cluster_highest_sessionid * period; - for (r = 1; r < MAXRADIUS; r++) - { - if (!radius[r].state) - continue; - if (radius[r].retry) - { - if (radius[r].retry <= TIME) - radiusretry(r); - } else - radius[r].retry = backoff(radius[r].try+1); // Is this really needed? --mo - } - for (t = 1; t <= config->cluster_highest_tunnelid; t++) + if (t_slice < 1) + t_slice = 1; + else if (t_slice > config->cluster_highest_tunnelid) + t_slice = config->cluster_highest_tunnelid; + + if (r_slice < 1) + r_slice = 1; + else if (r_slice > (MAXRADIUS - 1)) + r_slice = MAXRADIUS - 1; + + if (s_slice < 1) + s_slice = 1; + else if (s_slice > config->cluster_highest_sessionid) + s_slice = config->cluster_highest_sessionid; + + LOG(5, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period); + + for (i = 0; i < t_slice; i++) { + t++; + if (t > config->cluster_highest_tunnelid) + t = 1; + // check for expired tunnels if (tunnel[t].die && tunnel[t].die <= TIME) { STAT(tunnel_timeout); tunnelkill(t, "Expired"); + t_actions++; continue; } // check for message resend @@ -2024,7 +2126,7 @@ int regular_cleanups(void) if (tunnel[t].retry <= TIME) { controlt *c = tunnel[t].controls; - u8 w = tunnel[t].window; + uint8_t w = tunnel[t].window; tunnel[t].try++; // another try if (tunnel[t].try > 5) tunnelkill(t, "Timeout on control message"); // game over @@ -2034,6 +2136,8 @@ int regular_cleanups(void) tunnelsend(c->buf, c->length, t); c = c->next; } + + t_actions++; } } // Send hello @@ -2041,7 +2145,8 @@ int regular_cleanups(void) { 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, 0, t, "Sending HELLO message\n"); + t_actions++; } // Check for tunnel changes requested from the CLI @@ -2050,68 +2155,80 @@ int regular_cleanups(void) cli_tunnel_actions[t].action = 0; if (a & CLI_TUN_KILL) { - log(2, tunnel[t].ip, 0, t, "Dropping tunnel by CLI\n"); + LOG(2, 0, t, "Dropping tunnel by CLI\n"); tunnelshutdown(t, "Requested by administrator"); + t_actions++; } } + } + + for (i = 0; i < r_slice; i++) + { + r++; + if (r >= MAXRADIUS) + r = 1; + if (!radius[r].state) + continue; + + if (radius[r].retry <= TIME) + { + radiusretry(r); + r_actions++; + } } - count = 0; - for (i = 1; i <= config->cluster_highest_sessionid; i++) + for (i = 0; i < s_slice; i++) { s++; if (s > config->cluster_highest_sessionid) s = 1; - if (!session[s].tunnel) // Session isn't in use + if (!session[s].opened) // Session isn't in use continue; if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED)) { // IPCP has not completed yet. Resend - log(3, session[s].ip, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n"); + LOG(3, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n"); sendipcp(session[s].tunnel, s); + s_actions++; } // check for expired sessions if (session[s].die && session[s].die <= TIME) { sessionkill(s, "Expired"); - if (++count >= MAX_ACTIONS) break; + 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"); + sessionshutdown(s, "No response to LCP ECHO requests"); STAT(session_timeout); - if (++count >= MAX_ACTIONS) break; + s_actions++; continue; } // 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}; + uint8_t b[MAXCONTROL] = {0}; - u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP); - if (!q) - { - log(3, session[s].ip, s, t, "failed to send ECHO packet.\n"); - continue; - } + uint8_t *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP); + if (!q) continue; *q = EchoReq; - *(u8 *)(q + 1) = (time_now % 255); // ID - *(u16 *)(q + 2) = htons(8); // Length - *(u32 *)(q + 4) = 0; // Magic Number (not supported) + *(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, session[s].ip, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n", + 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 - if (++count >= MAX_ACTIONS) break; + s_actions++; } // Check for actions requested from the CLI @@ -2122,95 +2239,141 @@ int regular_cleanups(void) cli_session_actions[s].action = 0; if (a & CLI_SESS_KILL) { - log(2, 0, s, session[s].tunnel, "Dropping session by CLI\n"); + LOG(2, s, session[s].tunnel, "Dropping session by CLI\n"); sessionshutdown(s, "Requested by administrator"); a = 0; // dead, no need to check for other actions + s_actions++; } - if (a & CLI_SESS_SNOOP) + 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++; + } + else if (a & CLI_SESS_SNOOP) { - log(2, 0, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n", - inet_toa(cli_session_actions[s].snoop_ip), cli_session_actions[s].snoop_port); + LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n", + fmtaddr(cli_session_actions[s].snoop_ip, 0), + cli_session_actions[s].snoop_port); session[s].snoop_ip = cli_session_actions[s].snoop_ip; session[s].snoop_port = cli_session_actions[s].snoop_port; + s_actions++; send++; } - if (a & CLI_SESS_NOSNOOP) + if (a & CLI_SESS_NOTHROTTLE) { - log(2, 0, s, session[s].tunnel, "Unsnooping session by CLI\n"); - session[s].snoop_ip = 0; - session[s].snoop_port = 0; + LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n"); + throttle_session(s, 0, 0); + s_actions++; send++; } - - if (a & CLI_SESS_THROTTLE) + else if (a & CLI_SESS_THROTTLE) { - log(2, 0, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n", - cli_session_actions[s].throttle & 0xFFFF, - cli_session_actions[s].throttle >> 16); + LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n", + cli_session_actions[s].throttle_in, + cli_session_actions[s].throttle_out); - throttle_session(s, cli_session_actions[s].throttle); + throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out); + s_actions++; + send++; } - if (a & CLI_SESS_NOTHROTTLE) + 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, 0, s, session[s].tunnel, "Un-throttling session by CLI\n"); - throttle_session(s, 0); + 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); - - if (++count >= MAX_ACTIONS) break; } } - if (config->accounting_dir && next_acct <= TIME) - { - // Dump accounting data - next_acct = TIME + ACCT_TIME; - dump_acct_info(); - } - - if (count >= MAX_ACTIONS) - return 1; // Didn't finish! + LOG((t_actions || r_actions || s_actions) ? 3 : 4, 0, 0, + "Regular cleanup: processed %d tunnels, %d radius and %d sessions\n", + t_actions, r_actions, s_actions); - log(3, 0, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count, config->cleanup_interval); - return 0; + LOG(5, 0, 0, "End regular cleanup: checked %d tunnels, %d radius and %d sessions\n", + t_slice, r_slice, s_slice); } - // // Are we in the middle of a tunnel update, or radius // requests?? // -int still_busy(void) +static int still_busy(void) { int i; + static time_t stopped_bgp = 0; static clockt last_talked = 0; static clockt start_busy_wait = 0; - if (start_busy_wait == 0) - start_busy_wait = TIME; - for (i = config->cluster_highest_tunnelid ; i > 0 ; --i) + if (!config->cluster_iam_master) { - if (!tunnel[i].controlc) - continue; - - if (last_talked != TIME) +#ifdef BGP + if (bgp_configured) { - log(2,0,0,0, "Tunnel %d still has un-acked control messages.\n", i); - last_talked = TIME; - } - return 1; - } + 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 (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_TIMEOUT 1/10th seconds - if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIMEOUT) + // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds + if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME) { - log(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n"); + LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n"); return 0; } @@ -2223,7 +2386,7 @@ int still_busy(void) if (last_talked != TIME) { - log(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session); + LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session); last_talked = TIME; } return 1; @@ -2232,46 +2395,41 @@ int still_busy(void) return 0; } +static fd_set readset; +static int readset_n = 0; + // main loop - gets packets on tun or udp and processes them -void mainloop(void) +static void mainloop(void) { - fd_set cr; - int cn, i; - u8 buf[65536]; + int i; + uint8_t buf[65536]; struct timeval to; clockt next_cluster_ping = 0; // send initial ping immediately - time_t next_clean = time_now + config->cleanup_interval; - - log(4, 0, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n", - udpfd, tunfd, cluster_sockfd, controlfd); - - FD_ZERO(&cr); - FD_SET(udpfd, &cr); - FD_SET(tunfd, &cr); - FD_SET(controlfd, &cr); - FD_SET(clifd, &cr); - if (cluster_sockfd) FD_SET(cluster_sockfd, &cr); - cn = udpfd; - if (cn < tunfd) cn = tunfd; - 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 (!radfds[i]) continue; - FD_SET(radfds[i], &cr); - if (radfds[i] > cn) - cn = radfds[i]; - } + + LOG(4, 0, 0, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n", + udpfd, tunfd, cluster_sockfd, controlfd); + + FD_ZERO(&readset); + FD_SET(udpfd, &readset); + FD_SET(tunfd, &readset); + FD_SET(controlfd, &readset); + FD_SET(clifd, &readset); + if (cluster_sockfd) FD_SET(cluster_sockfd, &readset); + readset_n = udpfd; + if (tunfd > readset_n) readset_n = tunfd; + if (controlfd > readset_n) readset_n = controlfd; + if (clifd > readset_n) readset_n = clifd; + if (cluster_sockfd > readset_n) readset_n = cluster_sockfd; while (!main_quit || still_busy()) { fd_set r; - int n = cn; + int n = readset_n; #ifdef BGP fd_set w; int bgp_set[BGP_NUM_PEERS]; #endif /* BGP */ + int more = 0; if (config->reload_config) { @@ -2279,7 +2437,7 @@ void mainloop(void) update_config(); } - memcpy(&r, &cr, sizeof(fd_set)); + memcpy(&r, &readset, sizeof(fd_set)); to.tv_sec = 0; to.tv_usec = 100000; // 1/10th of a second. @@ -2308,70 +2466,137 @@ void mainloop(void) n = select(n + 1, &r, 0, 0, &to); #endif /* BGP */ - TIME = now(); + STAT(select_called); + + TIME = now(NULL); if (n < 0) { - if (errno == EINTR) + if (errno == EINTR || + errno == ECHILD) // EINTR was clobbered by sigchild_handler() continue; - log(0, 0, 0, 0, "Error returned from select(): %s\n", strerror(errno)); + LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno)); main_quit++; break; } else if (n) { struct sockaddr_in addr; - int alen = sizeof(addr); - if (FD_ISSET(udpfd, &r)) + int alen, c, s; + int udp_pkts = 0; + int tun_pkts = 0; + int cluster_pkts = 0; + + // nsctl commands + if (FD_ISSET(controlfd, &r)) + { + alen = sizeof(addr); + processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen); + n--; + } + + // RADIUS responses + if (config->cluster_iam_master) { - int c, n; - for (c = 0; c < config->multi_read_count; c++) + for (i = 0; i < config->num_radfds; i++) { - if ((n = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0) - processudp(buf, n, &addr); - else - break; + if (FD_ISSET(radfds[i], &r)) + { + processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i); + n--; + } } } - if (FD_ISSET(tunfd, &r)) + + // CLI connections + if (FD_ISSET(clifd, &r)) { - int c, n; - for (c = 0; c < config->multi_read_count; c++) + int cli; + + alen = sizeof(addr); + if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0) { - if ((n = read(tunfd, buf, sizeof(buf))) > 0) - processtun(buf, n); - else - break; + cli_do(cli); + close(cli); } + else + LOG(0, 0, 0, "accept error: %s\n", strerror(errno)); + + n--; } - 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)) + +#ifdef BGP + for (i = 0; i < BGP_NUM_PEERS; i++) { - int size; - size = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen); - processcluster(buf, size, addr.sin_addr.s_addr); + int isr = bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &r) : 0; + int isw = bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &w) : 0; + bgp_process(&bgp_peers[i], isr, isw); + if (isr) n--; + if (isw) n--; } - if (FD_ISSET(controlfd, &r)) - processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr); - if (FD_ISSET(clifd, &r)) +#endif /* BGP */ + + for (c = 0; n && c < config->multi_read_count; c++) { - struct sockaddr_in addr; - int sockfd; - int len = sizeof(addr); + // L2TP + if (FD_ISSET(udpfd, &r)) + { + alen = sizeof(addr); + if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0) + { + processudp(buf, s, &addr); + udp_pkts++; + } + else + { + FD_CLR(udpfd, &r); + n--; + } + } - if ((sockfd = accept(clifd, (struct sockaddr *)&addr, &len)) <= 0) + // incoming IP + if (FD_ISSET(tunfd, &r)) { - log(0, 0, 0, 0, "accept error: %s\n", strerror(errno)); - continue; + if ((s = read(tunfd, buf, sizeof(buf))) > 0) + { + processtun(buf, s); + tun_pkts++; + } + else + { + FD_CLR(tunfd, &r); + n--; + } } - else + + // cluster + if (FD_ISSET(cluster_sockfd, &r)) { - cli_do(sockfd); - close(sockfd); + alen = sizeof(addr); + if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0) + { + processcluster(buf, s, addr.sin_addr.s_addr); + cluster_pkts++; + } + else + { + FD_CLR(cluster_sockfd, &r); + 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). @@ -2393,9 +2618,11 @@ void mainloop(void) 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. - // Runs on all machines both master and slave. { static clockt last_run = 0; if (last_run != TIME) @@ -2405,31 +2632,44 @@ void mainloop(void) } } - /* Handle timeouts. Make sure that this gets run anyway, even if there was - * something to read, else under load this will never actually run.... - * - */ - if (config->cluster_iam_master && next_clean <= time_now) + // Handle timeouts, retries etc. { - if (regular_cleanups()) - { - // Did it finish? - next_clean = time_now + 1 ; // Didn't finish. Check quickly. - } - else + static double last_clean = 0; + double this_clean; + double diff; + + TIME = now(&this_clean); + diff = this_clean - last_clean; + + // Run during idle time (after we've handled + // all incoming packets) or every 1/10th sec + if (!more || diff > 0.1) { - next_clean = time_now + config->cleanup_interval; // Did. Move to next interval. + regular_cleanups(diff); + last_clean = this_clean; } } -#ifdef BGP - for (i = 0; i < BGP_NUM_PEERS; i++) + if (*config->accounting_dir) { - bgp_process(&bgp_peers[i], - bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &r) : 0, - bgp_set[i] ? FD_ISSET(bgp_peers[i].sock, &w) : 0); + static clockt next_acct = 0; + static clockt next_shut_acct = 0; + + if (next_acct <= TIME) + { + // Dump accounting data + next_acct = TIME + ACCT_TIME; + next_shut_acct = TIME + ACCT_SHUT_TIME; + dump_acct_info(1); + } + else if (next_shut_acct <= TIME) + { + // Dump accounting data for shutdown sessions + next_shut_acct = TIME + ACCT_SHUT_TIME; + if (shut_acct_n) + dump_acct_info(0); + } } -#endif /* BGP */ } // Are we the master and shutting down?? @@ -2442,76 +2682,152 @@ void mainloop(void) // // Important!!! We MUST not process any packets past this point! + LOG(1, 0, 0, "Clean 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 -void initdata(void) +static void initdata(int optdebug, char *optconfig) { int i; - if ((_statistics = shared_malloc(sizeof(struct Tstats))) == MAP_FAILED) + if (!(_statistics = shared_malloc(sizeof(struct Tstats)))) { - log(0, 0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno)); exit(1); } - if ((config = shared_malloc(sizeof(struct configt))) == MAP_FAILED) + if (!(config = shared_malloc(sizeof(configt)))) { - log(0, 0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno)); exit(1); } - memset(config, 0, sizeof(struct configt)); + memset(config, 0, sizeof(configt)); time(&config->start_time); - strncpy(config->config_file, CONFIGFILE, sizeof(config->config_file) - 1); - if ((tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)) == MAP_FAILED); + 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; + + if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL))) { - log(0, 0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno)); exit(1); } - if ((session = shared_malloc(sizeof(sessiont) * MAXSESSION)) == MAP_FAILED) + if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno)); exit(1); } - if ((sess_count = shared_malloc(sizeof(sessioncountt) * MAXSESSION)) == MAP_FAILED) + if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing malloc for sessions_count: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno)); exit(1); } - if ((radius = shared_malloc(sizeof(radiust) * MAXRADIUS)) == MAP_FAILED) + if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS))) { - log(0, 0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno)); exit(1); } - if ((ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)) == MAP_FAILED) + if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL))) { - log(0, 0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno)); exit(1); } +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); + #ifdef RINGBUFFER - if ((ringbuffer = shared_malloc(sizeof(struct Tringbuffer))) == MAP_FAILED) + if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer)))) { - log(0, 0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno)); exit(1); } memset(ringbuffer, 0, sizeof(struct Tringbuffer)); #endif - if ((cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)) - == MAP_FAILED) + if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno)); exit(1); } memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION); - if ((cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)) - == MAP_FAILED) + if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION))) { - log(0, 0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno)); exit(1); } memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION); @@ -2522,7 +2838,7 @@ void initdata(void) memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL); // Put all the sessions on the free list marked as undefined. - for (i = 1; i < MAXSESSION - 1; i++) + for (i = 1; i < MAXSESSION; i++) { session[i].next = i + 1; session[i].tunnel = T_UNDEF; // mark it as not filled in. @@ -2531,38 +2847,30 @@ void initdata(void) sessionfree = 1; // Mark all the tunnels as undefined (waiting to be filled in by a download). - for (i = 1; i < MAXTUNNEL- 1; i++) + for (i = 1; i < MAXTUNNEL; i++) tunnel[i].state = TUNNELUNDEF; // mark it as not filled in. if (!*hostname) { - char *p; // Grab my hostname unless it's been specified gethostname(hostname, sizeof(hostname)); - if ((p = strchr(hostname, '.'))) *p = 0; + stripdomain(hostname); } + _statistics->start_time = _statistics->last_reset = time(NULL); #ifdef BGP - if ((bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)) == MAP_FAILED) + if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS))) { - log(0, 0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno)); exit(1); } #endif /* BGP */ } -void initiptables(void) +static int assign_ip_address(sessionidt s) { - /* Flush the tables here so that we have a clean slate */ - -// Not needed. 'nat' is setup by garden.c -// mangle isn't used (as throttling is done by tbf inhouse). -} - -int assign_ip_address(sessionidt s) -{ - u32 i; + uint32_t i; int best = -1; time_t best_time = time_now; char *u = session[s].user; @@ -2593,7 +2901,7 @@ int assign_ip_address(sessionidt s) if (best < 0) { - log(0, 0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n"); + LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n"); return 0; } @@ -2611,16 +2919,19 @@ int assign_ip_address(sessionidt s) strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1); STAT(ip_allocated); - log(4, ip_address_pool[best].address, s, session[s].tunnel, - "assign_ip_address(): %s ip address %d from pool\n", reuse ? "Reusing" : "Allocating", best); + LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n", + reuse ? "Reusing" : "Allocating", best); return 1; } -void free_ip_address(sessionidt s) +static void free_ip_address(sessionidt s) { int i = session[s].ip_pool_index; + + CSTAT(call_free_ip_address); + if (!session[s].ip) return; // what the? @@ -2633,10 +2944,6 @@ void free_ip_address(sessionidt s) ip_address_pool[i].assigned = 0; ip_address_pool[i].session = 0; ip_address_pool[i].last = time_now; - - - CSTAT(call_free_ip_address); - } // @@ -2666,7 +2973,7 @@ void rebuild_address_pool(void) for (i = 0; i < MAXSESSION; ++i) { int ipid; - if (!session[i].ip || !session[i].tunnel) + if (!(session[i].opened && session[i].ip)) continue; ipid = - lookup_ipmap(htonl(session[i].ip)); @@ -2676,8 +2983,8 @@ void rebuild_address_pool(void) if (ipid < 1) // Not found in the pool either? good. continue; - log(0, 0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n", - i, inet_toa(session[i].ip), ipid); + LOG(0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n", + i, fmtaddr(session[i].ip, 0), ipid); // Fall through and process it as part of the pool. } @@ -2685,7 +2992,7 @@ void rebuild_address_pool(void) if (ipid > MAXIPPOOL || ipid < 0) { - log(0, 0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid); + LOG(0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid); ipid = -1; session[i].ip_pool_index = ipid; continue; @@ -2703,7 +3010,7 @@ void rebuild_address_pool(void) // // Fix the address pool to match a changed session. // (usually when the master sends us an update). -void fix_address_pool(int sid) +static void fix_address_pool(int sid) { int ipid; @@ -2724,7 +3031,7 @@ void fix_address_pool(int sid) // // Add a block of addresses to the IP pool to hand out. // -void add_to_ip_pool(u32 addr, u32 mask) +static void add_to_ip_pool(in_addr_t addr, in_addr_t mask) { int i; if (mask == 0) @@ -2745,14 +3052,14 @@ void add_to_ip_pool(u32 addr, u32 mask) ++ip_pool_size; if (ip_pool_size >= MAXIPPOOL) { - log(0,0,0,0, "Overflowed IP pool adding %s\n", inet_toa(htonl(addr)) ); + LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0)); return; } } } // Initialize the IP address pool -void initippool() +static void initippool() { FILE *f; char *p; @@ -2761,7 +3068,7 @@ void initippool() if (!(f = fopen(IPPOOLFILE, "r"))) { - log(0, 0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno)); + LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno)); exit(1); } @@ -2775,12 +3082,12 @@ void initippool() if ((p = (char *)strrchr(buf, '\n'))) *p = 0; if ((p = (char *)strchr(buf, ':'))) { - ipt src; + in_addr_t src; *p = '\0'; src = inet_addr(buf); if (src == INADDR_NONE) { - log(0, 0, 0, 0, "Invalid address pool IP %s\n", buf); + LOG(0, 0, 0, "Invalid address pool IP %s\n", buf); exit(1); } // This entry is for a specific IP only @@ -2793,20 +3100,22 @@ void initippool() { // It's a range int numbits = 0; - u32 start = 0, mask = 0; + in_addr_t start = 0, mask = 0; - log(2, 0, 0, 0, "Adding IP address range %s\n", buf); + LOG(2, 0, 0, "Adding IP address range %s\n", buf); *p++ = 0; if (!*p || !(numbits = atoi(p))) { - log(0, 0, 0, 0, "Invalid pool range %s\n", buf); + LOG(0, 0, 0, "Invalid pool range %s\n", buf); continue; } start = ntohl(inet_addr(pool)); - mask = (u32)(pow(2, numbits) - 1) << (32 - numbits); + mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits); // Add a static route for this pool - log(5, 0, 0, 0, "Adding route for address pool %s/%u\n", inet_toa(htonl(start)), 32 + mask); + LOG(5, 0, 0, "Adding route for address pool %s/%u\n", + fmtaddr(htonl(start), 0), 32 + mask); + routeset(0, start, mask, 0, 1); add_to_ip_pool(start, mask); @@ -2818,10 +3127,10 @@ void initippool() } } fclose(f); - log(1, 0, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1); + LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1); } -void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port) +void snoop_send_packet(char *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) @@ -2831,62 +3140,81 @@ void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port) snoop_addr.sin_addr.s_addr = destination; snoop_addr.sin_port = ntohs(port); - log(5, 0, 0, 0, "Snooping packet at %p (%d bytes) to %s:%d\n", - packet, size, inet_toa(snoop_addr.sin_addr.s_addr), htons(snoop_addr.sin_port)); + LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size, + fmtaddr(snoop_addr.sin_addr.s_addr, 0), + htons(snoop_addr.sin_port)); + if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0) - log(0, 0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno)); + STAT(packets_snooped); } -void dump_acct_info() +static int dump_session(FILE **f, sessiont *s) +{ + if (!s->opened || !s->ip || !(s->cin || s->cout) || !*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" + "# time: %ld\n" + "# uptime: %ld\n" + "# format: username ip qos uptxoctets downrxoctets\n", + hostname, + 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, // uptxoctets + (uint32_t) s->cout); // downrxoctets + + s->pin = s->cin = 0; + s->pout = s->cout = 0; + + return 1; +} + +static void dump_acct_info(int all) { - char filename[1024]; - char timestr[64]; - time_t t = time(NULL); int i; FILE *f = NULL; CSTAT(call_dump_acct_info); - 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 (shut_acct_n) { - 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); - } + for (i = 0; i < shut_acct_n; i++) + dump_session(&f, &shut_acct[i]); - log(4, 0, 0, 0, "Dumping accounting information for %s\n", session[i].user); - fprintf(f, "%s %s %d %u %u\n", - session[i].user, // username - inet_toa(htonl(session[i].ip)), // ip - (session[i].throttle) ? 2 : 1, // qos - (u32)session[i].cin, // uptxoctets - (u32)session[i].cout); // downrxoctets - - session[i].pin = session[i].cin = 0; - session[i].pout = session[i].cout = 0; + shut_acct_n = 0; } + if (all) + for (i = 1; i <= config->cluster_highest_sessionid; i++) + dump_session(&f, &session[i]); + if (f) fclose(f); } @@ -2894,40 +3222,42 @@ void dump_acct_info() // Main program int main(int argc, char *argv[]) { - int o; + int i; int optdebug = 0; - - _program_name = strdup(argv[0]); + char *optconfig = CONFIGFILE; time(&basetime); // start clock // scan args - while ((o = getopt(argc, argv, "vc:h:a:")) >= 0) + while ((i = getopt(argc, argv, "dvc:h:")) >= 0) { - switch (o) + switch (i) { - case 'd': - // Double fork to detach from terminal - if (fork()) exit(0); - if (fork()) exit(0); - break; - case 'v': - optdebug++; - break; - case 'h': - snprintf(hostname, sizeof(hostname), "%s", optarg); - break; - case '?': - default: - printf("Args are:\n" - "\t-d\tDetach from terminal\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; + 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; } } @@ -2937,26 +3267,24 @@ int main(int argc, char *argv[]) signal(SIGALRM, sigalrm_handler); siginterrupt(SIGALRM, 0); - initiptables(); initplugins(); - initdata(); - - config->debug = optdebug; + initdata(optdebug, optconfig); - init_tbf(); init_cli(hostname); read_config_file(); + init_tbf(config->num_tbfs); - log(0, 0, 0, 0, "L2TPNS version " VERSION "\n"); - log(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n"); - log(0, 0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n"); + LOG(0, 0, 0, "L2TPNS version " VERSION "\n"); + LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n"); + LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n"); { struct rlimit rlim; rlim.rlim_cur = RLIM_INFINITY; rlim.rlim_max = RLIM_INFINITY; // Remove the maximum core size if (setrlimit(RLIMIT_CORE, &rlim) < 0) - log(0, 0, 0, 0, "Can't set ulimit: %s\n", strerror(errno)); + LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno)); + // Make core dumps go to /tmp chdir("/tmp"); } @@ -2969,42 +3297,42 @@ int main(int argc, char *argv[]) if (get_nprocs() < 2) { - log(0, 0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n"); + LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n"); config->scheduler_fifo = 0; } else { if ((ret = sched_setscheduler(0, SCHED_FIFO, ¶ms)) == 0) { - log(1, 0, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n"); + LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n"); } else { - log(0, 0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno)); config->scheduler_fifo = 0; } } } /* Set up the cluster communications port. */ - if (cluster_init(config->bind_address) < 0) + if (cluster_init() < 0) exit(1); #ifdef BGP signal(SIGPIPE, SIG_IGN); bgp_setup(config->as_number); bgp_add_route(config->bind_address, 0xffffffff); - if (*config->bgp_peer[0]) - bgp_start(&bgp_peers[0], config->bgp_peer[0], - config->bgp_peer_as[0], 0); /* 0 = routing disabled */ - - if (*config->bgp_peer[1]) - bgp_start(&bgp_peers[1], config->bgp_peer[1], - config->bgp_peer_as[1], 0); + for (i = 0; i < BGP_NUM_PEERS; i++) + { + if (config->neighbour[i].name[0]) + bgp_start(&bgp_peers[i], config->neighbour[i].name, + config->neighbour[i].as, config->neighbour[i].keepalive, + config->neighbour[i].hold, 0); /* 0 = routing disabled */ + } #endif /* BGP */ inittun(); - log(1, 0, 0, 0, "Set up on interface %s\n", config->tundevice); + LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice); initudp(); initrad(); @@ -3022,9 +3350,9 @@ int main(int argc, char *argv[]) if (config->lock_pages) { if (!mlockall(MCL_CURRENT)) - log(1, 0, 0, 0, "Locking pages into memory\n"); + LOG(1, 0, 0, "Locking pages into memory\n"); else - log(0, 0, 0, 0, "Can't lock pages: %s\n", strerror(errno)); + LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno)); } alarm(1); @@ -3035,17 +3363,6 @@ int main(int argc, char *argv[]) mainloop(); -#ifdef BGP - /* try to shut BGP down cleanly; with luck the sockets will be - writable since we're out of the select */ - { - int i; - for (i = 0; i < BGP_NUM_PEERS; i++) - if (bgp_peers[i].state == Established) - bgp_stop(&bgp_peers[i]); - } -#endif /* BGP */ - /* remove plugins (so cleanup code gets run) */ plugins_done(); @@ -3059,7 +3376,7 @@ int main(int argc, char *argv[]) return 0; } -void sighup_handler(int junk) +static void sighup_handler(int sig) { if (log_stream && log_stream != stderr) { @@ -3070,7 +3387,7 @@ void sighup_handler(int junk) read_config_file(); } -void sigalrm_handler(int junk) +static void sigalrm_handler(int sig) { // Log current traffic stats @@ -3103,48 +3420,52 @@ void sigalrm_handler(int junk) } -void sigterm_handler(int junk) +static void sigterm_handler(int sig) { - log(1, 0, 0, 0, "Shutting down cleanly\n"); + LOG(1, 0, 0, "Shutting down cleanly\n"); if (config->save_state) dump_state(); main_quit++; } -void sigquit_handler(int junk) +static void sigquit_handler(int sig) { int i; - log(1, 0, 0, 0, "Shutting down without saving sessions\n"); - for (i = 1; i < MAXSESSION; i++) - { - if (session[i].opened) - sessionkill(i, "L2TPNS Closing"); - } - for (i = 1; i < MAXTUNNEL; i++) + LOG(1, 0, 0, "Shutting down without saving sessions\n"); + + if (config->cluster_iam_master) { - if (tunnel[i].ip || tunnel[i].state) - tunnelshutdown(i, "L2TPNS Closing"); + for (i = 1; i < MAXSESSION; i++) + { + if (session[i].opened) + sessionkill(i, "L2TPNS Closing"); + } + for (i = 1; i < MAXTUNNEL; i++) + { + if (tunnel[i].ip || tunnel[i].state) + tunnelshutdown(i, "L2TPNS Closing"); + } } main_quit++; } -void sigchild_handler(int signal) +static void sigchild_handler(int sig) { while (waitpid(-1, NULL, WNOHANG) > 0) ; } -void read_state() +static void read_state() { struct stat sb; int i; ippoolt itmp; FILE *f; char magic[sizeof(DUMP_MAGIC) - 1]; - u32 buf[2]; + uint32_t buf[2]; if (!config->save_state) { @@ -3160,7 +3481,7 @@ void read_state() if (sb.st_mtime < (time(NULL) - 60)) { - log(0, 0, 0, 0, "State file is too old to read, ignoring\n"); + LOG(0, 0, 0, "State file is too old to read, ignoring\n"); unlink(STATEFILE); return ; } @@ -3170,41 +3491,41 @@ void read_state() if (!f) { - log(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno)); + LOG(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"); + LOG(0, 0, 0, "Bad state file magic\n"); exit(1); } - log(1, 0, 0, 0, "Reading state information\n"); + LOG(1, 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"); + LOG(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); + LOG(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]); + LOG(2, 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)); + LOG(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); + LOG(0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i); exit(1); } @@ -3213,14 +3534,14 @@ void read_state() 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"); + LOG(0, 0, 0, "Error/mismatch reading tunnel header from state file\n"); exit(1); } - log(2, 0, 0, 0, "Loading %u tunnels\n", MAXTUNNEL); + LOG(2, 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"); + LOG(0, 0, 0, "Error reading tunnel data from state file\n"); exit(1); } @@ -3230,19 +3551,19 @@ void read_state() 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); + LOG(3, 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"); + LOG(0, 0, 0, "Error/mismatch reading session header from state file\n"); exit(1); } - log(2, 0, 0, 0, "Loading %u sessions\n", MAXSESSION); + LOG(2, 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"); + LOG(0, 0, 0, "Error reading session data from state file\n"); exit(1); } @@ -3252,20 +3573,20 @@ void read_state() session[i].tbf_out = 0; if (session[i].opened) { - log(2, 0, i, 0, "Loaded active session for user %s\n", session[i].user); + LOG(2, i, 0, "Loaded active session for user %s\n", session[i].user); if (session[i].ip) sessionsetup(session[i].tunnel, i); } } fclose(f); - log(0, 0, 0, 0, "Loaded saved state information\n"); + LOG(0, 0, 0, "Loaded saved state information\n"); } -void dump_state() +static void dump_state() { FILE *f; - u32 buf[2]; + uint32_t buf[2]; if (!config->save_state) return; @@ -3275,12 +3596,12 @@ void dump_state() if (!(f = fopen(STATEFILE, "w"))) break; - log(1, 0, 0, 0, "Dumping state information\n"); + LOG(1, 0, 0, "Dumping state information\n"); if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC) - 1, 1, f) != 1) break; - log(2, 0, 0, 0, "Dumping %u ip addresses\n", ip_pool_size); + LOG(2, 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) @@ -3288,7 +3609,7 @@ void dump_state() if (fwrite(ip_address_pool, sizeof(ippoolt), ip_pool_size, f) != ip_pool_size) break; - log(2, 0, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL); + LOG(2, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL); buf[0] = MAXTUNNEL; buf[1] = sizeof(tunnelt); if (fwrite(buf, sizeof(buf), 1, f) != 1) @@ -3296,7 +3617,7 @@ void dump_state() if (fwrite(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL) break; - log(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION); + LOG(2, 0, 0, "Dumping %u sessions\n", MAXSESSION); buf[0] = MAXSESSION; buf[1] = sizeof(sessiont); if (fwrite(buf, sizeof(buf), 1, f) != 1) @@ -3309,22 +3630,22 @@ void dump_state() } while (0); - log(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno)); + LOG(0, 0, 0, "Can't write state information: %s\n", strerror(errno)); unlink(STATEFILE); } -void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response) +static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response) { MD5_CTX ctx; *challenge_response = NULL; if (!*config->l2tpsecret) { - log(0, 0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n"); + LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n"); return; } - log(4, 0, 0, 0, " Building challenge response for CHAP request\n"); + LOG(4, 0, 0, " Building challenge response for CHAP request\n"); *challenge_response = (char *)calloc(17, 1); @@ -3348,7 +3669,7 @@ static int facility_value(char *name) return 0; } -void update_config() +static void update_config() { int i; static int timeout = 0; @@ -3414,17 +3735,16 @@ void update_config() } if (!config->numradiusservers) - { - log(0, 0, 0, 0, "No RADIUS servers defined!\n"); - } + LOG(0, 0, 0, "No RADIUS servers defined!\n"); - config->num_radfds = 2 << RADIUS_SHIFT; + config->num_radfds = 1 << RADIUS_SHIFT; // Update plugins for (i = 0; i < MAXPLUGINS; i++) { if (strcmp(config->plugins[i], config->old_plugins[i]) == 0) continue; + if (*config->plugins[i]) { // Plugin added @@ -3437,7 +3757,6 @@ void update_config() } } memcpy(config->old_plugins, config->plugins, sizeof(config->plugins)); - if (!config->cleanup_interval) config->cleanup_interval = 10; if (!config->multi_read_count) config->multi_read_count = 10; if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR); if (!*config->cluster_interface) @@ -3457,7 +3776,7 @@ void update_config() if (config->cluster_hb_timeout < t) { - log(0,0,0,0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t); + LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t); config->cluster_hb_timeout = t; } @@ -3481,14 +3800,14 @@ void update_config() } else { - log(0, 0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno)); + LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno)); } } config->reload_config = 0; } -void read_config_file() +static void read_config_file() { FILE *f; @@ -3499,9 +3818,9 @@ void read_config_file() return; } - log(3, 0, 0, 0, "Reading config file %s\n", config->config_file); + LOG(3, 0, 0, "Reading config file %s\n", config->config_file); cli_do_file(f); - log(3, 0, 0, 0, "Done reading config file\n"); + LOG(3, 0, 0, "Done reading config file\n"); fclose(f); update_config(); } @@ -3509,24 +3828,26 @@ void read_config_file() int sessionsetup(tunnelidt t, sessionidt s) { // A session now exists, set it up - ipt ip; + in_addr_t ip; char *user; sessionidt i; int r; CSTAT(call_sessionsetup); + LOG(3, s, t, "Doing session setup for session\n"); - log(3, session[s].ip, s, t, "Doing session setup for session\n"); - - if (!session[s].ip || session[s].ip == 0xFFFFFFFE) + if (!session[s].ip) { assign_ip_address(s); - if (session[s].ip) - log(3, 0, s, t, " No IP allocated. Assigned %s from pool\n", - inet_toa(htonl(session[s].ip))); - else - log(0, 0, s, t, " No IP allocated. The IP address pool is FULL!\n"); + if (!session[s].ip) + { + LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n"); + sessionshutdown(s, "No IP addresses available"); + return 0; + } + LOG(3, s, t, " No IP allocated. Assigned %s from pool\n", + fmtaddr(htonl(session[s].ip), 0)); } @@ -3548,23 +3869,35 @@ int sessionsetup(tunnelidt t, sessionidt s) } } + { + int routed = 0; + // Add the route for this session. - // - // Static IPs need to be routed. Anything else - // is part of the IP address pool and is already routed, - // it just needs to be added to the IP cache. - if (session[s].ip_pool_index == -1) // static ip - routeset(s, session[s].ip, 0, 0, 1); - else - cache_ipmap(session[s].ip, s); + for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++) + { + if ((session[s].ip & session[s].route[r].mask) == + (session[s].route[r].ip & session[s].route[r].mask)) + routed++; - for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++) - routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 1); + routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1); + } + + // 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. + if (session[s].ip_pool_index == -1) // static ip + { + if (!routed) routeset(s, session[s].ip, 0, 0, 1); + } + else + cache_ipmap(session[s].ip, s); + } if (!session[s].unique_id) { // did this session just finish radius? - log(3, session[s].ip, s, t, "Sending initial IPCP to client\n"); + LOG(3, s, t, "Sending initial IPCP to client\n"); sendipcp(t, s); session[s].unique_id = ++last_id; } @@ -3575,22 +3908,15 @@ int sessionsetup(tunnelidt t, sessionidt s) run_plugins(PLUGIN_NEW_SESSION, &data); } - // Force throttling on or off (Actually : refresh the current throttling status) - // This has the advantage of cleaning up after another throttled user who may have left - // firewall rules lying around - throttle_session(s, session[s].throttle); + // Allocate TBFs if throttled + if (session[s].throttle_in || session[s].throttle_out) + throttle_session(s, session[s].throttle_in, session[s].throttle_out); session[s].last_packet = time_now; - { - char *sessionip, *tunnelip; - sessionip = strdup(inet_toa(htonl(session[s].ip))); - tunnelip = strdup(inet_toa(htonl(tunnel[t].ip))); - log(2, session[s].ip, s, t, "Login by %s at %s from %s (%s)\n", - session[s].user, sessionip, tunnelip, tunnel[t].hostname); - if (sessionip) free(sessionip); - if (tunnelip) free(tunnelip); - } + LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user, + fmtaddr(htonl(session[s].ip), 0), + fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname); cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster. @@ -3604,12 +3930,13 @@ int sessionsetup(tunnelidt t, sessionidt s) int load_session(sessionidt s, sessiont *new) { int i; + int newip = 0; // Sanity checks. if (new->ip_pool_index >= MAXIPPOOL || new->tunnel >= MAXTUNNEL) { - log(0,0,s,0, "Strange session update received!\n"); + LOG(0, s, 0, "Strange session update received!\n"); // FIXME! What to do here? return 0; } @@ -3621,52 +3948,101 @@ int load_session(sessionidt s, sessiont *new) session[s].tunnel = new->tunnel; // For logging in cache_ipmap + // See if routes/ip cache need updating + if (new->ip != session[s].ip) + newip++; - if (new->ip != session[s].ip) // Changed ip. fix up hash tables. + 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) { - if (session[s].ip) // If there's an old one, remove it. + int routed = 0; + + // remove old routes... + for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++) { - // Remove any routes if the IP has changed - for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++) - { - routeset(s, session[s].route[i].ip, session[s].route[i].mask, session[s].ip, 0); - session[s].route[i].ip = 0; - } + if ((session[s].ip & session[s].route[i].mask) == + (session[s].route[i].ip & session[s].route[i].mask)) + routed++; + + routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0); + } + // ...ip + if (session[s].ip) + { if (session[s].ip_pool_index == -1) // static IP - routeset(s, session[s].ip, 0, 0, 0); + { + if (!routed) routeset(s, session[s].ip, 0, 0, 0); + } else // It's part of the IP pool, remove it manually. uncache_ipmap(session[s].ip); } + routed = 0; + + // add new routes... + for (i = 0; i < MAXROUTE && new->route[i].ip; i++) + { + if ((new->ip & new->route[i].mask) == + (new->route[i].ip & new->route[i].mask)) + routed++; + + routeset(s, new->route[i].ip, new->route[i].mask, 0, 1); + } + + // ...ip if (new->ip) { // If there's a new one, add it. if (new->ip_pool_index == -1) - routeset(s, new->ip, 0, 0, 1); + { + if (!routed) routeset(s, new->ip, 0, 0, 1); + } else cache_ipmap(new->ip, s); } } - // Update routed networks - for (i = 0; i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++) + // check filters + if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0])) { - if (new->route[i].ip == session[s].route[i].ip && - new->route[i].mask == session[s].route[i].mask) - continue; + LOG(2, s, session[s].tunnel, "Dropping invalid input filter %d\n", (int) new->filter_in); + new->filter_in = 0; + } - if (session[s].route[i].ip) // Remove the old one if it exists. - routeset(s, session[s].route[i].ip, session[s].route[i].mask, session[s].ip, 0); + if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0])) + { + LOG(2, s, session[s].tunnel, "Dropping invalid output filter %d\n", (int) new->filter_out); + new->filter_out = 0; + } + + if (new->filter_in != session[s].filter_in) + { + if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--; + if (new->filter_in) ip_filters[new->filter_in - 1].used++; + } - if (new->route[i].ip) // Add the new one if it exists. - routeset(s, new->route[i].ip, new->route[i].mask, new->ip, 1); + if (new->filter_out != session[s].filter_out) + { + if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--; + if (new->filter_out) ip_filters[new->filter_out - 1].used++; } if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used // for walking the sessions to forward byte counts to the master. config->cluster_highest_sessionid = s; + // TEMP: old session struct used a uint32_t to define the throttle + // speed for both up/down, new uses a uint16_t for each. Deal with + // sessions from an old master for migration. + if (new->throttle_out == 0 && new->tbf_out) + new->throttle_out = new->throttle_in; + memcpy(&session[s], new, sizeof(session[s])); // Copy over.. // Do fixups into address pool. @@ -3676,22 +4052,7 @@ int load_session(sessionidt s, sessiont *new) return 1; } -#ifdef RINGBUFFER -void ringbuffer_dump(FILE *stream) -{ - int i = ringbuffer->head; - - while (i != ringbuffer->tail) - { - 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; - } -} -#endif - -void initplugins() +static void initplugins() { int i; @@ -3706,22 +4067,48 @@ static void *open_plugin(char *plugin_name, int load) char path[256] = ""; snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name); - log(2, 0, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path); + LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path); return dlopen(path, RTLD_NOW); } -void add_plugin(char *plugin_name) +// plugin callback to get a config value +static void *getconfig(char *key, enum config_typet type) +{ + int i; + + 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; + + LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n", + key, type, config_values[i].type); + + return 0; + } + } + + LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key); + return 0; +} + +static int add_plugin(char *plugin_name) { static struct pluginfuncs funcs = { _log, _log_hex, - inet_toa, + fmtaddr, sessionbyuser, sessiontbysessionidt, sessionidtbysessiont, - sessionkill, radiusnew, radiussend, + getconfig, + sessionkill, + throttle_session, + cluster_send_session, }; void *p = open_plugin(plugin_name, 1); @@ -3730,23 +4117,23 @@ void add_plugin(char *plugin_name) if (!p) { - log(1, 0, 0, 0, " Plugin load failed: %s\n", dlerror()); - return; + LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror()); + return -1; } if (ll_contains(loaded_plugins, p)) { dlclose(p); - return; + return 0; // already loaded } { - int *v = dlsym(p, "__plugin_api_version"); + int *v = dlsym(p, "plugin_api_version"); if (!v || *v != PLUGIN_API_VERSION) { - log(1, 0, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror()); + LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror()); dlclose(p); - return; + return -1; } } @@ -3754,9 +4141,9 @@ void add_plugin(char *plugin_name) { if (!initfunc(&funcs)) { - log(1, 0, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror()); + LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror()); dlclose(p); - return; + return -1; } } @@ -3767,12 +4154,13 @@ void add_plugin(char *plugin_name) void *x; if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i]))) { - log(3, 0, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]); + LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]); ll_push(plugins[i], x); } } - log(2, 0, 0, 0, " Loaded plugin %s\n", plugin_name); + LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name); + return 1; } static void run_plugin_done(void *plugin) @@ -3783,48 +4171,54 @@ static void run_plugin_done(void *plugin) donefunc(); } -void remove_plugin(char *plugin_name) +static int remove_plugin(char *plugin_name) { void *p = open_plugin(plugin_name, 0); - int i; + int loaded = 0; if (!p) - return; - - 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); - } + return -1; 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); + } + ll_delete(loaded_plugins, p); run_plugin_done(p); + loaded = 1; } dlclose(p); - log(2, 0, 0, 0, "Removed plugin %s\n", plugin_name); + LOG(2, 0, 0, "Removed plugin %s\n", plugin_name); + return loaded; } int run_plugins(int plugin_type, void *data) { int (*func)(void *data); - if (!plugins[plugin_type] || plugin_type > max_plugin_functions) return 1; + + if (!plugins[plugin_type] || plugin_type > max_plugin_functions) + return PLUGIN_RET_ERROR; ll_reset(plugins[plugin_type]); while ((func = ll_next(plugins[plugin_type]))) { - int rc; - rc = func(data); - if (rc == PLUGIN_RET_STOP) return 1; - if (rc == PLUGIN_RET_ERROR) return 0; + int r = func(data); + + if (r != PLUGIN_RET_OK) + return r; // stop here } - return 1; + + return PLUGIN_RET_OK; } -void plugins_done() +static void plugins_done() { void *p; @@ -3833,83 +4227,192 @@ void plugins_done() run_plugin_done(p); } -void processcontrol(u8 * buf, int len, struct sockaddr_in *addr) +static void processcontrol(uint8_t * buf, int len, struct sockaddr_in *addr, int alen) { - char *resp; - int l; - struct param_control param = { buf, len, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), NULL, 0, 0 }; - + struct nsctl request; + struct nsctl response; + int type = unpack_control(&request, buf, len); + int r; + void *p; if (log_stream && config->debug >= 4) { - log(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received "); - dump_packet(buf, log_stream); + 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); + } } - resp = calloc(1400, 1); - l = new_packet(PKT_RESP_ERROR, resp); - *(int *)(resp + 6) = *(int *)(buf + 6); + 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; + } + + break; - 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; + 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; + } - run_plugins(PLUGIN_CONTROL, ¶m); + break; - 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"); - } + case NSCTL_REQ_HELP: + response.type = NSCTL_RES_OK; + response.argc = 0; - free(resp); -} + 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++; + } -/* - * HACK - * Go through all of the tunnels and do some cleanups - */ -void tunnel_clean() -{ - int i; + break; + + case NSCTL_REQ_CONTROL: + { + struct param_control param = { + config->cluster_iam_master, + request.argc, + request.argv, + 0, + NULL, + }; - log(1, 0, 0, 0, "Cleaning tunnels array\n"); + int r = run_plugins(PLUGIN_CONTROL, ¶m); - for (i = 1; i < MAXTUNNEL; i++) + if (r == PLUGIN_RET_ERROR) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = param.additional + ? param.additional + : "error returned by plugin"; + } + else if (r == PLUGIN_RET_NOTMASTER) + { + static char msg[] = "must be run on master: 000.000.000.000"; + + response.type = NSCTL_RES_ERR; + response.argc = 1; + if (config->cluster_master_address) + { + strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0)); + response.argv[0] = msg; + } + else + { + response.argv[0] = "must be run on master: none elected"; + } + } + else if (!(param.response & NSCTL_RESPONSE)) + { + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = param.response + ? "unrecognised response value from plugin" + : "unhandled action"; + } + else + { + response.type = param.response; + response.argc = 0; + if (param.additional) + { + response.argc = 1; + response.argv[0] = param.additional; + } + } + } + + break; + + default: + response.type = NSCTL_RES_ERR; + response.argc = 1; + response.argv[0] = "error unpacking control packet"; + } + + buf = calloc(NSCTL_MAX_PKT_SZ, 1); + if (!buf) { - if (!tunnel[i].ip - || !*tunnel[i].hostname - || (tunnel[i].state == TUNNELDIE && tunnel[i].die >= time_now)) + LOG(2, 0, 0, "Failed to allocate nsctl response\n"); + return; + } + + r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv); + if (r > 0) + { + sendto(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen); + if (log_stream && config->debug >= 4) { - tunnelclear(i); + LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0)); + dump_control(&response, log_stream); } } -} + else + LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n", + fmtaddr(addr->sin_addr.s_addr, 0), r); -void tunnelclear(tunnelidt t) -{ - if (!t) return; - memset(&tunnel[t], 0, sizeof(tunnel[t])); - tunnel[t].state = TUNNELFREE; + free(buf); } -tunnelidt new_tunnel() +static 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); + LOG(4, 0, i, "Assigning tunnel ID %d\n", i); if (i > config->cluster_highest_tunnelid) config->cluster_highest_tunnelid = i; return i; } } - log(0, 0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n"); + LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n"); return 0; } @@ -3922,19 +4425,32 @@ tunnelidt new_tunnel() // void become_master(void) { - int s; + int s, i; run_plugins(PLUGIN_BECOME_MASTER, NULL); - for (s = 1; s <= config->cluster_highest_sessionid ; ++s) + // 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].tunnel) // Not an in-use session. - continue; + for (s = 1; s <= config->cluster_highest_sessionid ; ++s) + { + if (!session[s].opened) // Not an in-use session. + continue; - run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]); + run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]); + } + exit(0); } -} - + // add radius fds + for (i = 0; i < config->num_radfds; i++) + { + FD_SET(radfds[i], &readset); + if (radfds[i] > readset_n) + readset_n = radfds[i]; + } +} int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc) { @@ -3951,7 +4467,7 @@ int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc for (s = 1; s <= config->cluster_highest_sessionid ; ++s) { int idle; - if (!session[s].tunnel) + if (!session[s].opened) continue; idle = time_now - session[s].last_packet; @@ -3989,7 +4505,7 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc for (s = 1; s <= config->cluster_highest_sessionid ; ++s) { int open = 0, d; - if (!session[s].tunnel) + if (!session[s].opened) continue; d = time_now - session[s].opened; @@ -4013,3 +4529,192 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc cli_print(cli, "%d total sessions open.", count); return CLI_OK; } + +/* Unhide an avp. + * + * This unencodes the AVP using the L2TP CHAP secret and the + * previously stored random vector. It replaces the hidden data with + * the cleartext data and returns the length of the cleartext data + * (including the AVP "header" of 6 bytes). + * + * Based on code from rp-l2tpd by Roaring Penguin Software Inc. + */ +static int unhide_avp(uint8_t *avp, tunnelidt t, sessionidt s, uint16_t length) +{ + MD5_CTX ctx; + uint8_t *cursor; + uint8_t digest[16]; + uint8_t working_vector[16]; + uint16_t hidden_length; + uint8_t type[2]; + size_t done, todo; + uint8_t *output; + + // Find the AVP type. + type[0] = *(avp + 4); + type[1] = *(avp + 5); + + // Line up with the hidden data + cursor = output = avp + 6; + + // Compute initial pad + MD5Init(&ctx); + MD5Update(&ctx, type, 2); + MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); + MD5Update(&ctx, session[s].random_vector, session[s].random_vector_length); + MD5Final(digest, &ctx); + + // Get hidden length + hidden_length = ((uint16_t) (digest[0] ^ cursor[0])) * 256 + (uint16_t) (digest[1] ^ cursor[1]); + + // Keep these for later use + working_vector[0] = *cursor; + working_vector[1] = *(cursor + 1); + cursor += 2; + + if (hidden_length > length - 8) + { + LOG(1, s, t, "Hidden length %d too long in AVP of length %d\n", (int) hidden_length, (int) length); + return 0; + } + + /* Decrypt remainder */ + done = 2; + todo = hidden_length; + while (todo) + { + working_vector[done] = *cursor; + *output = digest[done] ^ *cursor; + ++output; + ++cursor; + --todo; + ++done; + if (done == 16 && todo) + { + // Compute new digest + done = 0; + MD5Init(&ctx); + MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); + MD5Update(&ctx, &working_vector, 16); + MD5Final(digest, &ctx); + } + } + + return hidden_length + 6; +} + +static int ip_filter_port(ip_filter_portt *p, uint16_t port) +{ + switch (p->op) + { + case FILTER_PORT_OP_EQ: return port == p->port; + case FILTER_PORT_OP_NEQ: return port != p->port; + case FILTER_PORT_OP_GT: return port > p->port; + case FILTER_PORT_OP_LT: return port < p->port; + case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2; + } + + return 0; +} + +static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags) +{ + switch (op) + { + case FILTER_FLAG_OP_ANY: + return (flags & sflags) || (~flags & cflags); + + case FILTER_FLAG_OP_ALL: + return (flags & sflags) == sflags && (~flags & cflags) == cflags; + + case FILTER_FLAG_OP_EST: + return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN); + } + + return 0; +} + +int ip_filter(uint8_t *buf, int len, uint8_t filter) +{ + uint16_t frag_offset; + uint8_t proto; + in_addr_t src_ip; + in_addr_t dst_ip; + uint16_t src_port = 0; + uint16_t dst_port = 0; + uint8_t flags = 0; + ip_filter_rulet *rule; + + if (len < 20) // up to end of destination address + return 0; + + if ((*buf >> 4) != 4) // IPv4 + return 0; + + frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff; + proto = buf[9]; + src_ip = *(in_addr_t *) (buf + 12); + dst_ip = *(in_addr_t *) (buf + 16); + + if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP)) + { + int l = (buf[0] & 0xf) * 4; // length of IP header + if (len < l + 4) // ports + return 0; + + src_port = ntohs(*(uint16_t *) (buf + l)); + dst_port = ntohs(*(uint16_t *) (buf + l + 2)); + if (proto == IPPROTO_TCP) + { + if (len < l + 14) // flags + return 0; + + flags = buf[l + 13] & 0x3f; + } + } + + for (rule = ip_filters[filter].rules; rule->action; rule++) + { + if (rule->proto != IPPROTO_IP && proto != rule->proto) + continue; + + if (rule->src_wild != INADDR_BROADCAST && + (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild)) + continue; + + if (rule->dst_wild != INADDR_BROADCAST && + (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild)) + continue; + + if (frag_offset) + { + if (!rule->frag || rule->action == FILTER_ACTION_DENY) + continue; + } + else + { + if (rule->frag) + continue; + + if (proto == IPPROTO_TCP || proto == IPPROTO_UDP) + { + if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port)) + continue; + + if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port)) + continue; + + if (proto == IPPROTO_TCP && rule->tcp_flag_op && + !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags)) + continue; + } + } + + // matched + rule->counter++; + return rule->action == FILTER_ACTION_PERMIT; + } + + // default deny + return 0; +}