X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/5e9fdf2e5f0255b2e42c41c3a08e38ae2f38c590..26472225bbf74bc552c23917247ab404febb936c:/l2tpns.c?ds=sidebyside diff --git a/l2tpns.c b/l2tpns.c index a402e57..d95517e 100644 --- a/l2tpns.c +++ b/l2tpns.c @@ -4,7 +4,7 @@ // 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 1.29 2004-09-23 03:59:09 fred_nerk Exp $"; +char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.39 2004-11-03 13:23:58 bodea Exp $"; #include #include @@ -57,7 +57,7 @@ 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 = NULL; // us. +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 @@ -95,20 +95,20 @@ struct config_descriptt config_values[] = { CONFIG("debug", debug, INT), CONFIG("log_file", log_filename, STRING), CONFIG("pid_file", pid_file, STRING), - CONFIG("hostname", hostname, STRING), CONFIG("l2tp_secret", l2tpsecret, STRING), CONFIG("primary_dns", default_dns1, IP), CONFIG("secondary_dns", default_dns2, IP), CONFIG("save_state", save_state, BOOL), CONFIG("primary_radius", radiusserver[0], IP), CONFIG("secondary_radius", radiusserver[1], IP), - CONFIG("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("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), @@ -239,7 +239,7 @@ 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; @@ -249,7 +249,7 @@ void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *tit // 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, 0, "%s (%d bytes):\n", title, maxsize); setvbuf(log_stream, NULL, _IOFBF, 16384); for (i = 0; i < maxsize; ) @@ -967,65 +967,48 @@ 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). // -int throttle_session(sessionidt s, int throttle) +// If either value is -1, the current value is retained for that +// direction. +// +void throttle_session(sessionidt s, int rate_in, int rate_out) { if (!session[s].tunnel) - return 0; // No-one home. + 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; - - if (session[s].tbf_in || session[s].tbf_out) - { - if (throttle == session[s].throttle) - return 1; - - // Currently throttled but the rate is changing. - + int bytes = rate_in * 1024 / 8; // kbits to bytes + if (session[s].tbf_in) free_tbf(session[s].tbf_in); - 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_in > 0) + session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin); + else + session[s].tbf_in = 0; - return 1; + session[s].throttle_in = rate_in; } - // else Unthrottling. - - if (!session[s].tbf_in && !session[s].tbf_out && !session[s].throttle) - return 0; - - free_tbf(session[s].tbf_in); - session[s].tbf_in = 0; + if (rate_out >= 0) + { + int bytes = rate_out * 1024 / 8; + if (session[s].tbf_out) + free_tbf(session[s].tbf_out); - free_tbf(session[s].tbf_out); - session[s].tbf_out = 0; + if (rate_out > 0) + session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout); + else + session[s].tbf_out = 0; - if (throttle != session[s].throttle) - { - // Changed. Flood to slaves. - session[s].throttle = throttle; - cluster_send_session(s); + session[s].throttle_out = rate_out; } - - return 0; } // start tidy shutdown of session @@ -1091,16 +1074,18 @@ void sessionshutdown(sessionidt s, char *reason) } 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 } + cluster_send_session(s); } @@ -1159,8 +1144,6 @@ void sessionkill(sessionidt s, char *reason) 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; @@ -1578,7 +1561,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr) case 13: // Response // Why did they send a response? We never challenge. log(2, ntohl(addr->sin_addr.s_addr), s, t, " received unexpected challenge response\n"); - break; + break; case 14: // assigned session asession = session[s].far = ntohs(*(u16 *) (b)); @@ -2141,7 +2124,14 @@ int regular_cleanups(void) a = 0; // dead, no need to check for other actions } - if (a & CLI_SESS_SNOOP) + if (a & CLI_SESS_NOSNOOP) + { + log(2, 0, s, session[s].tunnel, "Unsnooping session by CLI\n"); + session[s].snoop_ip = 0; + session[s].snoop_port = 0; + 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); @@ -2151,27 +2141,20 @@ int regular_cleanups(void) 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, 0, s, session[s].tunnel, "Un-throttling session by CLI\n"); + throttle_session(s, 0, 0); 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); + cli_session_actions[s].throttle_in, + cli_session_actions[s].throttle_out); - throttle_session(s, cli_session_actions[s].throttle); - } - - if (a & CLI_SESS_NOTHROTTLE) - { - log(2, 0, s, session[s].tunnel, "Un-throttling session by CLI\n"); - throttle_session(s, 0); + throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out); + send++; } if (send) @@ -2180,6 +2163,7 @@ int regular_cleanups(void) if (++count >= MAX_ACTIONS) break; } } + if (*config->accounting_dir && next_acct <= TIME) { // Dump accounting data @@ -2220,8 +2204,8 @@ int still_busy(void) 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"); return 0; @@ -2245,11 +2229,13 @@ 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) { - fd_set cr; - int cn, i; + int i; u8 buf[65536]; struct timeval to; clockt next_cluster_ping = 0; // send initial ping immediately @@ -2258,29 +2244,22 @@ void mainloop(void) 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]; - } + 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]; @@ -2292,7 +2271,7 @@ 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. @@ -2324,7 +2303,8 @@ void mainloop(void) TIME = now(); 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)); @@ -2357,17 +2337,22 @@ void mainloop(void) break; } } - 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 (config->cluster_iam_master) + for (i = 0; i < config->num_radfds; i++) + if (FD_ISSET(radfds[i], &r)) + processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i); + if (FD_ISSET(cluster_sockfd, &r)) { int size; size = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen); processcluster(buf, size, addr.sin_addr.s_addr); } + if (FD_ISSET(controlfd, &r)) processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr); + if (FD_ISSET(clifd, &r)) { struct sockaddr_in addr; @@ -2458,10 +2443,9 @@ void mainloop(void) } // Init data structures -void initdata(void) +void initdata(int optdebug, char *optconfig) { int i; - char *p; if (!(_statistics = shared_malloc(sizeof(struct Tstats)))) { @@ -2475,7 +2459,11 @@ void initdata(void) } memset(config, 0, sizeof(struct configt)); time(&config->start_time); - strncpy(config->config_file, CONFIGFILE, sizeof(config->config_file) - 1); + strncpy(config->config_file, optconfig, strlen(optconfig)); + config->debug = optdebug; + config->num_tbfs = MAXTBFS; + config->rl_rate = 28; // 28kbps + if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL))) { log(0, 0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno)); @@ -2546,10 +2534,13 @@ void initdata(void) for (i = 1; i < MAXTUNNEL- 1; i++) tunnel[i].state = TUNNELUNDEF; // mark it as not filled in. - // Grab my hostname unless it's been specified - gethostname(config->hostname, sizeof(config->hostname)); - if ((p = strchr(config->hostname, '.'))) *p = 0; - hostname = config->hostname; + if (!*hostname) + { + char *p; + // Grab my hostname unless it's been specified + gethostname(hostname, sizeof(hostname)); + if ((p = strchr(hostname, '.'))) *p = 0; + } _statistics->start_time = _statistics->last_reset = time(NULL); @@ -2864,7 +2855,7 @@ void dump_acct_info() for (i = 0; i < MAXSESSION; i++) { - if (!session[i].opened || !session[i].ip || (!session[i].cin && !session[i].cout) || !*session[i].user || session[i].walled_garden) + if (!session[i].opened || !session[i].ip || !(session[i].cin || session[i].cout) || !*session[i].user || session[i].walled_garden) continue; if (!f) { @@ -2887,11 +2878,11 @@ void dump_acct_info() 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].user, // username + inet_toa(htonl(session[i].ip)), // ip + (session[i].throttle_in || session[i].throttle_out) ? 2 : 1, // qos + (u32)session[i].cin, // uptxoctets + (u32)session[i].cout); // downrxoctets session[i].pin = session[i].cin = 0; session[i].pout = session[i].cout = 0; @@ -2906,13 +2897,14 @@ int main(int argc, char *argv[]) { int o; int optdebug = 0; + char *optconfig = CONFIGFILE; _program_name = strdup(argv[0]); time(&basetime); // start clock // scan args - while ((o = getopt(argc, argv, "vc:h:a:")) >= 0) + while ((o = getopt(argc, argv, "dvc:h:")) >= 0) { switch (o) { @@ -2924,10 +2916,12 @@ int main(int argc, char *argv[]) case 'v': optdebug++; break; + case 'c': + optconfig = optarg; + break; case 'h': snprintf(hostname, sizeof(hostname), "%s", optarg); break; - case '?': default: printf("Args are:\n" "\t-d\tDetach from terminal\n" @@ -2949,13 +2943,11 @@ int main(int argc, char *argv[]) initiptables(); initplugins(); - initdata(); - - config->debug = optdebug; + initdata(optdebug, optconfig); - init_tbf(); - init_cli(); + 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"); @@ -3526,7 +3518,6 @@ int sessionsetup(tunnelidt t, sessionidt s) CSTAT(call_sessionsetup); - log(3, session[s].ip, s, t, "Doing session setup for session\n"); if (!session[s].ip || session[s].ip == 0xFFFFFFFE) @@ -3536,7 +3527,11 @@ int sessionsetup(tunnelidt t, sessionidt s) 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"); + sessionshutdown(s, "No IP addresses available"); + return 0; + } } @@ -3585,10 +3580,9 @@ 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; @@ -3677,6 +3671,12 @@ int load_session(sessionidt s, sessiont *new) // for walking the sessions to forward byte counts to the master. config->cluster_highest_sessionid = s; + // TEMP: old session struct used a u32 to define the throttle + // speed for both up/down, new uses a u16 for each. Deal with + // sessions from an old master for migration. + if (new->throttle_out == 0 && new->tbf_out) + new->throttle_out = new->throttle_in; + memcpy(&session[s], new, sizeof(session[s])); // Copy over.. // Do fixups into address pool. @@ -3932,19 +3932,33 @@ 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].tunnel) // 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++) + { + if (!radfds[i]) continue; + 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) {