X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/31c32f3d3d951fe9e8bbfe1170dff77ba924bdcc..e68cca06cfa3fe30e85ed4b5135e2671db30f81b:/l2tpns.c?ds=sidebyside diff --git a/l2tpns.c b/l2tpns.c index 9e9b34a..ada7468 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 1.103 2005/05/13 01:29:40 bodea Exp $"; +char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.152 2005/12/14 02:19:15 bodea Exp $"; #include #include @@ -52,7 +52,7 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.103 2005/05/13 01:29:40 bodea Exp #ifdef BGP #include "bgp.h" -#endif /* BGP */ +#endif // Globals configt *config = NULL; // all configuration @@ -60,19 +60,25 @@ int tunfd = -1; // tun interface file handle. (network device) int udpfd = -1; // UDP file handle int controlfd = -1; // Control signal handle int clifd = -1; // Socket listening for CLI connections. +int daefd = -1; // Socket listening for DAE connections. int snoopfd = -1; // UDP file handle for sending out intercept data int *radfds = NULL; // RADIUS requests file handles int ifrfd = -1; // File descriptor for routing, etc int ifr6fd = -1; // File descriptor for IPv6 routing, etc -static int rand_fd = -1; // Random data source +int rand_fd = -1; // Random data source +int cluster_sockfd = -1; // Intra-cluster communications socket. +int epollfd = -1; // event polling time_t basetime = 0; // base clock char hostname[1000] = ""; // us. static int tunidx; // ifr_ifindex of tun device static int syslog_log = 0; // are we logging to syslog static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog). -extern int cluster_sockfd; // Intra-cluster communications socket. uint32_t last_id = 0; // Unique ID for radius accounting +// calculated from config->l2tp_mtu +uint16_t MRU = 0; // PPP MRU +uint16_t MSS = 0; // TCP MSS + struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI @@ -90,7 +96,9 @@ 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. -static char main_quit = 0; // True if we're in the process of exiting. +static int time_changed = 0; // time_now changed +char main_quit = 0; // True if we're in the process of exiting. +static char main_reload = 0; // Re-load pending linked_list *loaded_plugins; linked_list *plugins[MAX_PLUGIN_TYPES]; @@ -102,7 +110,11 @@ config_descriptt config_values[] = { CONFIG("log_file", log_filename, STRING), CONFIG("pid_file", pid_file, STRING), CONFIG("random_device", random_device, STRING), - CONFIG("l2tp_secret", l2tpsecret, STRING), + CONFIG("l2tp_secret", l2tp_secret, STRING), + CONFIG("l2tp_mtu", l2tp_mtu, INT), + CONFIG("ppp_restart_time", ppp_restart_time, INT), + CONFIG("ppp_max_configure", ppp_max_configure, INT), + CONFIG("ppp_max_failure", ppp_max_failure, INT), CONFIG("primary_dns", default_dns1, IPv4), CONFIG("secondary_dns", default_dns2, IPv4), CONFIG("primary_radius", radiusserver[0], IPv4), @@ -113,6 +125,8 @@ config_descriptt config_values[] = { CONFIG("radius_interim", radius_interim, INT), CONFIG("radius_secret", radiussecret, STRING), CONFIG("radius_authtypes", radius_authtypes_s, STRING), + CONFIG("radius_dae_port", radius_dae_port, SHORT), + CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL), CONFIG("bind_address", bind_address, IPv4), CONFIG("peer_address", peer_address, IPv4), CONFIG("send_garp", send_garp, BOOL), @@ -121,7 +135,6 @@ config_descriptt config_values[] = { 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), @@ -129,8 +142,10 @@ config_descriptt config_values[] = { CONFIG("packet_limit", max_packets, INT), CONFIG("cluster_address", cluster_address, IPv4), CONFIG("cluster_interface", cluster_interface, STRING), + CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT), CONFIG("cluster_hb_interval", cluster_hb_interval, INT), CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT), + CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT), CONFIG("ipv6_prefix", ipv6_prefix, IPv6), { NULL, 0, 0, 0 }, }; @@ -146,6 +161,8 @@ static char *plugin_functions[] = { "plugin_kill_session", "plugin_control", "plugin_radius_response", + "plugin_radius_reset", + "plugin_radius_account", "plugin_become_master", "plugin_new_session_master", }; @@ -161,7 +178,7 @@ sessiont *session = NULL; // Array of session structures. sessionlocalt *sess_local = NULL; // Array of local per-session counters. radiust *radius = NULL; // Array of radius structures. ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses. -ip_filtert *ip_filters = NULL; // Array of named filters. +ip_filtert *ip_filters = NULL; // Array of named filters. static controlt *controlfree = 0; struct Tstats *_statistics = NULL; #ifdef RINGBUFFER @@ -174,11 +191,9 @@ static void cache_ipv6map(struct in6_addr ip, int prefixlen, int s); static void free_ip_address(sessionidt s); static void dump_acct_info(int all); static void sighup_handler(int sig); -static void sigalrm_handler(int sig); -static void sigterm_handler(int sig); -static void sigquit_handler(int sig); +static void shutdown_handler(int sig); static void sigchild_handler(int sig); -static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response); +static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response); static void update_config(void); static void read_config_file(void); static void initplugins(void); @@ -189,11 +204,25 @@ static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int static tunnelidt new_tunnel(void); static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len); -// return internal time (10ths since process startup) -static clockt now(void) +// on slaves, alow BGP to withdraw cleanly before exiting +#define QUIT_DELAY 5 + +// quit actions (master) +#define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover) +#define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections + +// return internal time (10ths since process startup), set f if given +// as a side-effect sets time_now, and time_changed +static clockt now(double *f) { struct timeval t; gettimeofday(&t, 0); + if (f) *f = t.tv_sec + t.tv_usec / 1000000.0; + if (t.tv_sec != time_now) + { + time_now = t.tv_sec; + time_changed++; + } return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1; } @@ -203,7 +232,7 @@ static clockt now(void) clockt backoff(uint8_t try) { if (try > 5) try = 5; // max backoff - return now() + 10 * (1 << try); + return now(NULL) + 10 * (1 << try); } @@ -246,10 +275,10 @@ void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) va_end(ap); } -void _log_hex(int level, const char *title, const char *data, int maxsize) +void _log_hex(int level, const char *title, const uint8_t *data, int maxsize) { int i, j; - const uint8_t *d = (const uint8_t *) data; + const uint8_t *d = data; if (config->debug < level) return; @@ -297,6 +326,16 @@ void _log_hex(int level, const char *title, const char *data, int maxsize) } } +// update a counter, accumulating 2^32 wraps +void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta) +{ + uint32_t new = *counter + delta; + if (new < *counter) + (*wrap)++; + + *counter = new; +} + // initialise the random generator static void initrandom(char *source) { @@ -307,7 +346,8 @@ static void initrandom(char *source) return; // close previous source, if any - if (rand_fd >= 0) close(rand_fd); + if (rand_fd >= 0) + close(rand_fd); rand_fd = -1; @@ -324,13 +364,6 @@ static void initrandom(char *source) path, strerror(errno)); } } - - // no source: seed prng - { - unsigned seed = time_now ^ getpid(); - LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed); - srand(seed); - } } // fill buffer with random data @@ -351,7 +384,7 @@ void random_data(uint8_t *buf, int len) strerror(errno)); // fall back to rand() - initrandom(0); + initrandom(NULL); } n = 0; @@ -521,6 +554,13 @@ static void inittun(void) LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno)); exit(1); } + /* set MTU to modem MRU + 4 (tun header) */ + ifr.ifr_mtu = MRU + 4; + if (ioctl(ifrfd, SIOCSIFMTU, (void *) &ifr) < 0) + { + LOG(0, 0, 0, "Error setting tun MTU: %s\n", strerror(errno)); + exit(1); + } ifr.ifr_flags = IFF_UP; if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0) { @@ -535,7 +575,7 @@ static void inittun(void) tunidx = ifr.ifr_ifindex; // Only setup IPv6 on the tun device if we have a configured prefix - if (config->ipv6_prefix.s6_addr[0] > 0) { + if (config->ipv6_prefix.s6_addr[0]) { ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0); // Link local address is FE80::1 @@ -565,7 +605,7 @@ static void inittun(void) } } -// set up UDP port +// set up UDP ports static void initudp(void) { int on = 1; @@ -587,7 +627,6 @@ static void initudp(void) LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno)); exit(1); } - snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); // Control memset(&addr, 0, sizeof(addr)); @@ -600,6 +639,21 @@ static void initudp(void) LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno)); exit(1); } + + // Dynamic Authorization Extensions to RADIUS + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = htons(config->radius_dae_port); + daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); + setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); + if (bind(daefd, (void *) &addr, sizeof(addr)) < 0) + { + LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno)); + exit(1); + } + + // Intercept + snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); } // @@ -672,8 +726,11 @@ sessionidt sessionbyipv6(struct in6_addr ip) CSTAT(sessionbyipv6); if (!memcmp(&config->ipv6_prefix, &ip, 8) || - (ip.s6_addr[0] == 0xFE && ip.s6_addr[1] == 0x80 && - (ip.s6_addr16[1] == ip.s6_addr16[2] == ip.s6_addr16[3] == 0))) { + (ip.s6_addr[0] == 0xFE && + ip.s6_addr[1] == 0x80 && + ip.s6_addr16[1] == 0 && + ip.s6_addr16[2] == 0 && + ip.s6_addr16[3] == 0)) { s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]); } else { s = lookup_ipv6map(ip); @@ -883,18 +940,14 @@ void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t) if (!t) { - static int backtrace_count = 0; LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n"); STAT(tunnel_tx_errors); - log_backtrace(backtrace_count, 5) return; } if (!tunnel[t].ip) { - static int backtrace_count = 0; 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; } @@ -912,7 +965,7 @@ void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t) { tunnel[t].last = time_now; // control message sent tunnel[t].retry = backoff(tunnel[t].try); // when to resend - if (tunnel[t].try > 1) + if (tunnel[t].try) { STAT(tunnel_retries); LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try); @@ -941,16 +994,71 @@ int tun_write(uint8_t * data, int size) return write(tunfd, data, size); } +// adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set) +void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp) +{ + int d = (tcp[12] >> 4) * 4; + uint8_t *mss = 0; + uint8_t *opts; + uint8_t *data; + uint16_t orig; + uint32_t sum; + + if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK + return; + + if (tcp + d > buf + len) // short? + return; + + opts = tcp + 20; + data = tcp + d; + + while (opts < data) + { + if (*opts == 2 && opts[1] == 4) // mss option (2), length 4 + { + mss = opts + 2; + if (mss + 2 > data) return; // short? + break; + } + + if (*opts == 0) return; // end of options + if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop) + opts++; + else + opts += opts[1]; // skip over option + } + + if (!mss) return; // not found + orig = ntohs(*(uint16_t *) mss); + + if (orig <= MSS) return; // mss OK + + LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n", + fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp), + fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)), + (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS); + + // set mss + *(int16_t *) mss = htons(MSS); + + // adjust checksum (see rfc1141) + sum = orig + (~MSS & 0xffff); + sum += ntohs(*(uint16_t *) (tcp + 16)); + sum = (sum & 0xffff) + (sum >> 16); + *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16)); +} + // process outgoing (to tunnel) IP // -static void processipout(uint8_t * buf, int len) +static void processipout(uint8_t *buf, int len) { sessionidt s; sessiont *sp; tunnelidt t; in_addr_t ip; - char *data = buf; // Keep a copy of the originals. + uint8_t *data = buf; // Keep a copy of the originals. int size = len; uint8_t b[MAXETHER + 20]; @@ -997,7 +1105,8 @@ static void processipout(uint8_t * buf, int len) if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second. { LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0)); - host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4), ip, buf, (len < 64) ? 64 : len); + host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4), + config->bind_address ? config->bind_address : my_address, buf, len); } return; } @@ -1047,6 +1156,14 @@ static void processipout(uint8_t * buf, int len) if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1)) return; + // adjust MSS on SYN and SYN,ACK packets with options + if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment + { + int ihl = (buf[0] & 0xf) * 4; // length of IP header + if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5)) + adjust_tcp_mss(s, t, buf, len, buf + ihl); + } + if (sp->tbf_out) { // Are we throttling this session? @@ -1056,7 +1173,8 @@ static void processipout(uint8_t * buf, int len) master_throttle_packet(sp->tbf_out, data, size); return; } - else if (sp->walled_garden && !config->cluster_iam_master) + + if (sp->walled_garden && !config->cluster_iam_master) { // We are walled-gardening this master_garden_packet(s, data, size); @@ -1067,7 +1185,7 @@ static void processipout(uint8_t * buf, int len) // Add on L2TP header { - uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP); + uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP); if (!p) return; tunnelsend(b, len + (p-b), t); // send it... } @@ -1076,11 +1194,13 @@ static void processipout(uint8_t * buf, int len) if (sp->snoop_ip && sp->snoop_port) snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port); - sp->cout += len; // byte count - sp->total_cout += len; // byte count + increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count + sp->cout_delta += len; sp->pout++; udp_tx += len; + sess_local[s].cout += len; // To send to master.. + sess_local[s].pout++; } // process outgoing (to tunnel) IPv6 @@ -1093,7 +1213,7 @@ static void processipv6out(uint8_t * buf, int len) in_addr_t ip; struct in6_addr ip6; - char *data = buf; // Keep a copy of the originals. + uint8_t *data = buf; // Keep a copy of the originals. int size = len; uint8_t b[MAXETHER + 20]; @@ -1176,7 +1296,7 @@ static void processipv6out(uint8_t * buf, int len) // Add on L2TP header { - uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIPV6); + uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6); if (!p) return; tunnelsend(b, len + (p-b), t); // send it... } @@ -1185,11 +1305,13 @@ static void processipv6out(uint8_t * buf, int len) if (sp->snoop_ip && sp->snoop_port) snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port); - sp->cout += len; // byte count - sp->total_cout += len; // byte count + increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count + sp->cout_delta += len; sp->pout++; udp_tx += len; + sess_local[s].cout += len; // To send to master.. + sess_local[s].pout++; } // @@ -1226,7 +1348,7 @@ static void send_ipout(sessionidt s, uint8_t *buf, int len) // Add on L2TP header { - uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP); + uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP); if (!p) return; tunnelsend(b, len + (p-b), t); // send it... } @@ -1235,11 +1357,13 @@ static void send_ipout(sessionidt s, uint8_t *buf, int len) if (sp->snoop_ip && sp->snoop_port) snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port); - sp->cout += len; // byte count - sp->total_cout += len; // byte count + increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count + sp->cout_delta += len; sp->pout++; udp_tx += len; + sess_local[s].cout += len; // To send to master.. + sess_local[s].pout++; } // add an AVP (16 bit) @@ -1276,7 +1400,7 @@ static void controls(controlt * c, uint16_t avp, char *val, uint8_t m) } // add a binary AVP -static void controlb(controlt * c, uint16_t avp, char *val, unsigned int len, uint8_t m) +static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m) { uint16_t l = ((m ? 0x8000 : 0) + len + 6); *(uint16_t *) (c->buf + c->length + 0) = htons(l); @@ -1323,7 +1447,7 @@ static void controlnull(tunnelidt t) } // add a control message to a tunnel, and send if within window -static void controladd(controlt * c, tunnelidt t, sessionidt far) +static void controladd(controlt *c, sessionidt far, tunnelidt t) { *(uint16_t *) (c->buf + 2) = htons(c->length); // length *(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel @@ -1395,7 +1519,7 @@ void throttle_session(sessionidt s, int rate_in, int rate_out) } // add/remove filters from session (-1 = no change) -static void filter_session(sessionidt s, int filter_in, int filter_out) +void filter_session(sessionidt s, int filter_in, int filter_out) { if (!session[s].opened) return; // No-one home. @@ -1456,10 +1580,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) if (session[s].ip && !walled_garden && !session[s].die) { // RADIUS Stop message - uint16_t r = sess_local[s].radius; - if (!r) - r = radiusnew(s); - + uint16_t r = radiusnew(s); if (r) { // stop, if not already trying @@ -1497,7 +1618,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) free_ip_address(s); // unroute IPv6, if setup - if (session[s].flags & SF_IPV6_ROUTED) + if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen) route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0); } @@ -1509,7 +1630,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) controlt *c = controlnew(14); // sending CDN if (error) { - char buf[4]; + uint8_t buf[4]; *(uint16_t *) buf = htons(result); *(uint16_t *) (buf+2) = htons(error); controlb(c, 1, buf, 4, 1); @@ -1518,7 +1639,7 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) control16(c, 1, result, 1); control16(c, 14, s, 1); // assigned session (our end) - controladd(c, session[s].tunnel, session[s].far); // send the message + controladd(c, session[s].far, session[s].tunnel); // send the message } if (!session[s].die) @@ -1528,78 +1649,70 @@ void sessionshutdown(sessionidt s, char *reason, int result, int error) if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--; if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--; + // clear PPP state + memset(&session[s].ppp, 0, sizeof(session[s].ppp)); + sess_local[s].lcp.restart = 0; + sess_local[s].ipcp.restart = 0; + sess_local[s].ipv6cp.restart = 0; + sess_local[s].ccp.restart = 0; + cluster_send_session(s); } -void sendipcp(tunnelidt t, sessionidt s) +void sendipcp(sessionidt s, tunnelidt t) { - uint8_t buf[MAXCONTROL]; - uint16_t r = sess_local[s].radius; + uint8_t buf[MAXETHER]; uint8_t *q; CSTAT(sendipcp); + LOG(3, s, t, "IPCP: send ConfigReq\n"); - if (!r) - r = radiusnew(s); - - if (!r) - { - sessionshutdown(s, "No free RADIUS sessions for IPCP", 3, 0); - return; - } - - if (radius[r].state != RADIUSIPCP) - { - radius[r].state = RADIUSIPCP; - radius[r].try = 0; - } - - radius[r].retry = backoff(radius[r].try++); - if (radius[r].try > 10) + if (!session[s].unique_id) { - radiusclear(r, s); // Clear radius session. - sessionshutdown(s, "No reply to IPCP.", 3, 0); - return; + if (!++last_id) ++last_id; // skip zero + session[s].unique_id = last_id; } - q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP); + q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP); if (!q) return; *q = ConfigReq; - q[1] = r << RADIUS_SHIFT; // ID, dont care, we only send one type of request - *(uint16_t *) (q + 2) = htons(10); - q[4] = 3; - q[5] = 6; + q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request + *(uint16_t *) (q + 2) = htons(10); // packet length + q[4] = 3; // ip address option + q[5] = 6; // option length *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address : config->bind_address ? config->bind_address : my_address; // send my IP tunnelsend(buf, 10 + (q - buf), t); // send it - session[s].flags &= ~SF_IPCP_ACKED; // Clear flag. - - // If we have an IPv6 prefix length configured, assume we should - // try to negotiate an IPv6 session as well. Unless we've had a - // (N)ACK for IPV6CP. - if (config->ipv6_prefix.s6_addr[0] > 0 && - !(session[s].flags & SF_IPV6CP_ACKED) && - !(session[s].flags & SF_IPV6_NACKED)) - { - q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPV6CP); - if (!q) return; - - *q = ConfigReq; - q[1] = r << RADIUS_SHIFT; // ID, don't care, we - // only send one type - // of request - *(uint16_t *) (q + 2) = htons(14); - q[4] = 1; - q[5] = 10; - *(uint32_t *) (q + 6) = 0; // We'll be prefix::1 - *(uint32_t *) (q + 10) = 0; - q[13] = 1; - - tunnelsend(buf, 14 + (q - buf), t); // send it - } + restart_timer(s, ipcp); +} + +void sendipv6cp(sessionidt s, tunnelidt t) +{ + uint8_t buf[MAXETHER]; + uint8_t *q; + + CSTAT(sendipv6cp); + LOG(3, s, t, "IPV6CP: send ConfigReq\n"); + + q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP); + if (!q) return; + + *q = ConfigReq; + q[1] = session[s].unique_id & 0xf; // ID, don't care, we + // only send one type + // of request + *(uint16_t *) (q + 2) = htons(14); + q[4] = 1; // interface identifier option + q[5] = 10; // option length + *(uint32_t *) (q + 6) = 0; // We'll be prefix::1 + *(uint32_t *) (q + 10) = 0; + q[13] = 1; + + tunnelsend(buf, 14 + (q - buf), t); // send it + restart_timer(s, ipv6cp); } static void sessionclear(sessionidt s) @@ -1694,7 +1807,7 @@ static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, cha // close session for (s = 1; s <= config->cluster_highest_sessionid ; ++s) if (session[s].tunnel == t) - sessionshutdown(s, reason, 3, 0); + sessionshutdown(s, reason, 0, 0); tunnel[t].state = TUNNELDIE; tunnel[t].die = TIME + 700; // Clean up in 70 seconds @@ -1705,7 +1818,7 @@ static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, cha controlt *c = controlnew(4); // sending StopCCN if (error) { - char buf[64]; + uint8_t buf[64]; int l = 4; *(uint16_t *) buf = htons(result); *(uint16_t *) (buf+2) = htons(error); @@ -1725,14 +1838,14 @@ static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, cha control16(c, 1, result, 1); control16(c, 9, t, 1); // assigned tunnel (our end) - controladd(c, t, 0); // send the message + controladd(c, 0, t); // send the message } } // read and process packet on tunnel (UDP) -void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) +void processudp(uint8_t *buf, int len, struct sockaddr_in *addr) { - char *chapresponse = NULL; + uint8_t *chapresponse = NULL; uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0; uint8_t *p = buf + 2; @@ -1796,12 +1909,16 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) return; } l -= (p - buf); + + // used to time out old tunnels + if (t && tunnel[t].state == TUNNELOPEN) + tunnel[t].lastrec = time_now; + if (*buf & 0x80) { // control uint16_t message = 0xFFFF; // message type uint8_t fatal = 0; uint8_t mandatory = 0; - uint8_t authtype = 0; // proxy auth type uint16_t asession = 0; // assigned session uint32_t amagic = 0; // magic number uint8_t aflags = 0; // flags from last LCF @@ -1884,9 +2001,6 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) return; } - // This is used to time out old tunnels - tunnel[t].lastrec = time_now; - // check sequence of this message { int skip = tunnel[t].window; // track how many in-window packets are still in queue @@ -1976,7 +2090,7 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) uint16_t orig_len; // handle hidden AVPs - if (!*config->l2tpsecret) + if (!*config->l2tp_secret) { LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n"); fatal = flags; @@ -2004,8 +2118,6 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) continue; } - LOG(4, s, t, "Hidden AVP\n"); - // Unhide the AVP unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length); @@ -2026,13 +2138,15 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) n = orig_len; } - LOG(4, s, t, " AVP %d (%s) len %d\n", mtype, avp_name(mtype), n); + LOG(4, s, t, " AVP %d (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n, + flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : ""); + switch (mtype) { case 0: // message type message = ntohs(*(uint16_t *) b); mandatory = flags & 0x80; - LOG(4, s, t, " Message type = %d (%s)\n", *b, l2tp_message_type(message)); + LOG(4, s, t, " Message type = %d (%s)\n", *b, l2tp_code(message)); break; case 1: // result code { @@ -2040,18 +2154,18 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) const char* resdesc = "(unknown)"; if (message == 4) { /* StopCCN */ - resdesc = stopccn_result_code(rescode); + resdesc = l2tp_stopccn_result_code(rescode); } else if (message == 14) { /* CDN */ - resdesc = cdn_result_code(rescode); + resdesc = l2tp_cdn_result_code(rescode); } LOG(4, s, t, " Result Code %d: %s\n", rescode, resdesc); if (n >= 4) { uint16_t errcode = ntohs(*(uint16_t *)(b + 2)); - LOG(4, s, t, " Error Code %d: %s\n", errcode, error_code(errcode)); + LOG(4, s, t, " Error Code %d: %s\n", errcode, l2tp_error_code(errcode)); } if (n > 4) LOG(4, s, t, " Error String: %.*s\n", n-4, b+4); @@ -2185,12 +2299,7 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) case 29: // Proxy Authentication Type { uint16_t atype = ntohs(*(uint16_t *)b); - LOG(4, s, t, " Proxy Auth Type %d (%s)\n", atype, auth_type(atype)); - if (atype == 2) - authtype = AUTHCHAP; - else if (atype == 3) - authtype = AUTHPAP; - + LOG(4, s, t, " Proxy Auth Type %d (%s)\n", atype, ppp_auth_type(atype)); break; } case 30: // Proxy Authentication Name @@ -2205,16 +2314,12 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) case 31: // Proxy Authentication Challenge { LOG(4, s, t, " Proxy Auth Challenge\n"); - if (sess_local[s].radius) - memcpy(radius[sess_local[s].radius].auth, b, 16); break; } case 32: // Proxy Authentication ID { uint16_t authid = ntohs(*(uint16_t *)(b)); LOG(4, s, t, " Proxy Auth ID (%d)\n", authid); - if (sess_local[s].radius) - radius[sess_local[s].radius].id = authid; break; } case 33: // Proxy Authentication Response @@ -2227,14 +2332,10 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) { if (*p == 5 && p[1] == 6) // Magic-Number amagic = ntohl(*(uint32_t *) (p + 2)); - else if (*p == 3 && p[1] == 4 && *(uint16_t *) (p + 2) == htons(PPPPAP)) // Authentication-Protocol (PAP) - authtype = AUTHPAP; - else if (*p == 3 && p[1] == 5 && *(uint16_t *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol (CHAP) - authtype = AUTHCHAP; else if (*p == 7) // Protocol-Field-Compression - aflags |= SESSIONPFC; + aflags |= SESSION_PFC; else if (*p == 8) // Address-and-Control-Field-Compression - aflags |= SESSIONACFC; + aflags |= SESSION_ACFC; p += p[1]; } } @@ -2248,6 +2349,8 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) case 36: // Random Vector LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n"); memset(session[s].random_vector, 0, sizeof(session[s].random_vector)); + if (n > sizeof(session[s].random_vector)) + n = sizeof(session[s].random_vector); memcpy(session[s].random_vector, b, n); session[s].random_vector_length = n; break; @@ -2270,16 +2373,21 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) switch (message) { case 1: // SCCRQ - Start Control Connection Request + tunnel[t].state = TUNNELOPENING; + if (main_quit != QUIT_SHUTDOWN) { controlt *c = controlnew(2); // sending SCCRP control16(c, 2, version, 1); // protocol version control32(c, 3, 3, 1); // framing - controls(c, 7, tunnel[t].hostname, 1); // host name (TBA) + controls(c, 7, hostname, 1); // host name if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response control16(c, 9, t, 1); // assigned tunnel - controladd(c, t, 0); // send the resply + controladd(c, 0, t); // send the resply + } + else + { + tunnelshutdown(t, "Shutting down", 6, 0, 0); } - tunnel[t].state = TUNNELOPENING; break; case 2: // SCCRP tunnel[t].state = TUNNELOPEN; @@ -2305,9 +2413,9 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) // TBA break; case 10: // ICRQ - if (sessionfree) + if (sessionfree && main_quit != QUIT_SHUTDOWN) { - uint16_t r; + controlt *c = controlnew(11); // ICRP s = sessionfree; sessionfree = session[s].next; @@ -2316,39 +2424,36 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) if (s > config->cluster_highest_sessionid) config->cluster_highest_sessionid = s; - // make a RADIUS session - if ((r = radiusnew(s))) - { - controlt *c = controlnew(11); // sending ICRP - session[s].opened = time_now; - session[s].tunnel = t; - session[s].far = asession; - session[s].last_packet = time_now; - 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, asession); // send the reply - - strncpy(radius[r].calling, calling, sizeof(radius[r].calling) - 1); - strncpy(session[s].called, called, sizeof(session[s].called) - 1); - strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1); - STAT(session_created); - break; - } + session[s].opened = time_now; + session[s].tunnel = t; + session[s].far = asession; + session[s].last_packet = time_now; + LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far); + control16(c, 14, s, 1); // assigned session + controladd(c, asession, t); // send the reply + strncpy(session[s].called, called, sizeof(session[s].called) - 1); + strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1); - LOG(1, s, t, "No free RADIUS sessions for ICRQ\n"); - sessionclear(s); - } - else - { - STAT(session_overflow); - LOG(1, 0, t, "No free sessions\n"); + session[s].ppp.phase = Establish; + session[s].ppp.lcp = Starting; + + STAT(session_created); + break; } { controlt *c = controlnew(14); // CDN - control16(c, 1, 4, 1); // temporary lack of resources - controladd(c, session[s].tunnel, asession); // send the message + if (!sessionfree) + { + STAT(session_overflow); + LOG(1, 0, t, "No free sessions\n"); + control16(c, 1, 4, 0); // temporary lack of resources + } + else + control16(c, 1, 2, 7); // shutting down, try another + + controladd(c, asession, t); // send the message } return; case 11: // ICRP @@ -2357,16 +2462,17 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) case 12: // ICCN if (amagic == 0) amagic = time_now; session[s].magic = amagic; // set magic number - session[s].l2tp_flags = aflags; // set flags received - LOG(3, s, t, "Magic %X Flags %X\n", amagic, aflags); + session[s].flags = aflags; // set flags received + session[s].mru = PPPMTU; // default controlnull(t); // ack - // proxy authentication type is not supported - if (!(config->radius_authtypes & authtype)) - authtype = config->radius_authprefer; // start LCP - sendlcp(t, s, authtype); + sess_local[s].lcp_authtype = config->radius_authprefer; + sess_local[s].ppp_mru = MRU; + sendlcp(s, t); + change_state(s, lcp, RequestSent); break; + case 14: // CDN controlnull(t); // ack sessionshutdown(s, "Closed (Received CDN).", 0, 0); @@ -2392,7 +2498,7 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) } else { // data - uint16_t prot; + uint16_t proto; LOG_HEX(5, "Receive Tunnel Data", p, l); if (l > 2 && p[0] == 0xFF && p[1] == 0x03) @@ -2408,12 +2514,12 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) } if (*p & 1) { - prot = *p++; + proto = *p++; l--; } else { - prot = ntohs(*(uint16_t *) p); + proto = ntohs(*(uint16_t *) p); p += 2; l -= 2; } @@ -2433,50 +2539,43 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) return; } - if (prot == PPPPAP) + if (proto == PPPPAP) { session[s].last_packet = time_now; if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processpap(t, s, p, l); + processpap(s, t, p, l); } - else if (prot == PPPCHAP) + else if (proto == PPPCHAP) { session[s].last_packet = time_now; if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processchap(t, s, p, l); + processchap(s, t, p, l); } - else if (prot == PPPLCP) + else if (proto == PPPLCP) { session[s].last_packet = time_now; if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processlcp(t, s, p, l); + processlcp(s, t, p, l); } - else if (prot == PPPIPCP) + else if (proto == PPPIPCP) { session[s].last_packet = time_now; if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processipcp(t, s, p, l); + processipcp(s, t, p, l); } - else if (prot == PPPIPV6CP) + else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0]) { - if (config->ipv6_prefix.s6_addr[0] > 0) - { - session[s].last_packet = time_now; - if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processipv6cp(t, s, p, l); - } - else - { - LOG(1, s, t, "IPv6 not configured; ignoring IPv6CP\n"); - } + session[s].last_packet = time_now; + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } + processipv6cp(s, t, p, l); } - else if (prot == PPPCCP) + else if (proto == PPPCCP) { session[s].last_packet = time_now; if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } - processccp(t, s, p, l); + processccp(s, t, p, l); } - else if (prot == PPPIP) + else if (proto == PPPIP) { if (session[s].die) { @@ -2491,15 +2590,10 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) return; } - processipin(t, s, p, l); + processipin(s, t, p, l); } - else if (prot == PPPIPV6) + else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0]) { - if (!config->ipv6_prefix.s6_addr[0] > 0) - { - LOG(1, s, t, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n"); - return; - } if (session[s].die) { LOG(4, s, t, "Session %d is closing. Don't process PPP packets\n", s); @@ -2513,12 +2607,18 @@ void processudp(uint8_t * buf, int len, struct sockaddr_in *addr) return; } - processipv6in(t, s, p, l); + processipv6in(s, t, p, l); + } + else if (session[s].ppp.lcp == Opened) + { + session[s].last_packet = time_now; + if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; } + protoreject(s, t, p, l, proto); } else { - STAT(tunnel_rx_errors); - LOG(1, s, t, "Unknown PPP protocol %04X\n", prot); + LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n", + proto, ppp_state(session[s].ppp.lcp)); } } } @@ -2544,48 +2644,67 @@ static void processtun(uint8_t * buf, int len) if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4 processipout(buf, len); else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6 - && config->ipv6_prefix.s6_addr[0] > 0) + && config->ipv6_prefix.s6_addr[0]) processipv6out(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 - -static int regular_cleanups(void) +// Handle retries, timeouts. Runs every 1/10th sec, want to ensure +// that we look at the whole of the tunnel, radius and session tables +// every second +static void regular_cleanups(double period) { - static sessionidt s = 0; // Next session to check for actions on. - tunnelidt t; - int count=0,i; - uint16_t r; - static clockt next_acct = 0; - static clockt next_shut_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, "Begin regular cleanup\n"); + // divide up tables into slices based on the last run + t_slice = config->cluster_highest_tunnelid * period; + r_slice = (MAXRADIUS - 1) * period; + s_slice = config->cluster_highest_sessionid * period; - for (r = 1; r < MAXRADIUS; r++) - { - if (!radius[r].state) - continue; - if (radius[r].retry) - { - if (radius[r].retry <= TIME) - radiusretry(r); - } else - radius[r].retry = backoff(radius[r].try+1); // Is this really needed? --mo - } - for (t = 1; t <= config->cluster_highest_tunnelid; t++) + if (t_slice < 1) + t_slice = 1; + else if (t_slice > config->cluster_highest_tunnelid) + t_slice = config->cluster_highest_tunnelid; + + if (r_slice < 1) + r_slice = 1; + else if (r_slice > (MAXRADIUS - 1)) + r_slice = MAXRADIUS - 1; + + if (s_slice < 1) + s_slice = 1; + else if (s_slice > config->cluster_highest_sessionid) + s_slice = config->cluster_highest_sessionid; + + LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period); + + for (i = 0; i < t_slice; i++) { + t++; + if (t > config->cluster_highest_tunnelid) + t = 1; + // check for expired tunnels if (tunnel[t].die && tunnel[t].die <= TIME) { STAT(tunnel_timeout); tunnelkill(t, "Expired"); + t_actions++; continue; } // check for message resend @@ -2605,14 +2724,17 @@ static int regular_cleanups(void) tunnelsend(c->buf, c->length, t); c = c->next; } + + t_actions++; } } // Send hello - if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600) + if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60) { controlt *c = controlnew(6); // sending HELLO - controladd(c, t, 0); // send the message + controladd(c, 0, t); // send the message LOG(3, 0, t, "Sending HELLO message\n"); + t_actions++; } // Check for tunnel changes requested from the CLI @@ -2623,13 +2745,28 @@ static int regular_cleanups(void) { LOG(2, 0, t, "Dropping tunnel by CLI\n"); tunnelshutdown(t, "Requested by administrator", 1, 0, 0); + t_actions++; } } + } + + for (i = 0; i < r_slice; i++) + { + r++; + if (r >= MAXRADIUS) + r = 1; + if (!radius[r].state) + continue; + + if (radius[r].retry <= TIME) + { + radiusretry(r); + r_actions++; + } } - count = 0; - for (i = 1; i <= config->cluster_highest_sessionid; i++) + for (i = 0; i < s_slice; i++) { s++; if (s > config->cluster_highest_sessionid) @@ -2644,16 +2781,120 @@ static int regular_cleanups(void) if (session[s].die <= TIME) { sessionkill(s, "Expired"); - if (++count >= MAX_ACTIONS) break; + s_actions++; } continue; } - if (session[s].ip && !(session[s].flags & SF_IPCP_ACKED)) + // PPP timeouts + if (sess_local[s].lcp.restart <= time_now) + { + int next_state = session[s].ppp.lcp; + switch (session[s].ppp.lcp) + { + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].lcp.conf_sent < config->ppp_max_configure) + { + LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n"); + sendlcp(s, session[s].tunnel); + change_state(s, lcp, next_state); + } + else + { + sessionshutdown(s, "No response to LCP ConfigReq.", 3, 0); + STAT(session_timeout); + } + + s_actions++; + } + + if (session[s].die) + continue; + } + + if (sess_local[s].ipcp.restart <= time_now) { - // IPCP has not completed yet. Resend - LOG(3, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n"); - sendipcp(session[s].tunnel, s); + int next_state = session[s].ppp.ipcp; + switch (session[s].ppp.ipcp) + { + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure) + { + LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n"); + sendipcp(s, session[s].tunnel); + change_state(s, ipcp, next_state); + } + else + { + sessionshutdown(s, "No response to IPCP ConfigReq.", 3, 0); + STAT(session_timeout); + } + + s_actions++; + } + + if (session[s].die) + continue; + } + + if (sess_local[s].ipv6cp.restart <= time_now) + { + int next_state = session[s].ppp.ipv6cp; + switch (session[s].ppp.ipv6cp) + { + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure) + { + LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n"); + sendipv6cp(s, session[s].tunnel); + change_state(s, ipv6cp, next_state); + } + else + { + LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n"); + change_state(s, ipv6cp, Stopped); + } + + s_actions++; + } + } + + if (sess_local[s].ccp.restart <= time_now) + { + int next_state = session[s].ppp.ccp; + switch (session[s].ppp.ccp) + { + case RequestSent: + case AckReceived: + next_state = RequestSent; + + case AckSent: + if (sess_local[s].ccp.conf_sent < config->ppp_max_configure) + { + LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n"); + sendccp(s, session[s].tunnel); + change_state(s, ccp, next_state); + } + else + { + LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n"); + change_state(s, ccp, Stopped); + } + + s_actions++; + } } // Drop sessions who have not responded within IDLE_TIMEOUT seconds @@ -2661,16 +2902,17 @@ static int regular_cleanups(void) { sessionshutdown(s, "No response to LCP ECHO requests.", 3, 0); STAT(session_timeout); - if (++count >= MAX_ACTIONS) break; + s_actions++; continue; } // No data in ECHO_TIMEOUT seconds, send LCP ECHO - if (session[s].user[0] && (time_now - session[s].last_packet >= ECHO_TIMEOUT)) + if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT) && + (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT)) { - uint8_t b[MAXCONTROL] = {0}; + uint8_t b[MAXETHER]; - uint8_t *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP); + uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP); if (!q) continue; *q = EchoReq; @@ -2681,7 +2923,8 @@ static int regular_cleanups(void) 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; + sess_local[s].last_echo = time_now; + s_actions++; } // Check for actions requested from the CLI @@ -2695,6 +2938,7 @@ static int regular_cleanups(void) LOG(2, s, session[s].tunnel, "Dropping session by CLI\n"); sessionshutdown(s, "Requested by administrator.", 3, 0); a = 0; // dead, no need to check for other actions + s_actions++; } if (a & CLI_SESS_NOSNOOP) @@ -2702,6 +2946,7 @@ static int regular_cleanups(void) 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) @@ -2712,6 +2957,7 @@ static int regular_cleanups(void) session[s].snoop_ip = cli_session_actions[s].snoop_ip; session[s].snoop_port = cli_session_actions[s].snoop_port; + s_actions++; send++; } @@ -2719,6 +2965,7 @@ static int regular_cleanups(void) { LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n"); throttle_session(s, 0, 0); + s_actions++; send++; } else if (a & CLI_SESS_THROTTLE) @@ -2728,6 +2975,7 @@ static int regular_cleanups(void) cli_session_actions[s].throttle_out); throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out); + s_actions++; send++; } @@ -2735,6 +2983,7 @@ static int regular_cleanups(void) { 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) @@ -2744,13 +2993,12 @@ static int regular_cleanups(void) 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; } // RADIUS interim accounting @@ -2759,7 +3007,8 @@ static int regular_cleanups(void) && !sess_local[s].radius // RADIUS already in progress && time_now - sess_local[s].last_interim >= config->radius_interim) { - if (!(r = radiusnew(s))) + int rad = radiusnew(s); + if (!rad) { LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n"); STAT(radius_overflow); @@ -2769,40 +3018,16 @@ static int regular_cleanups(void) LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n", session[s].user, session[s].unique_id); - radiussend(r, RADIUSINTERIM); + radiussend(rad, RADIUSINTERIM); sess_local[s].last_interim = time_now; - - if (++count >= MAX_ACTIONS) - break; + s_actions++; } } - if (*config->accounting_dir) - { - 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); - } - } - - if (count >= MAX_ACTIONS) - return 1; // Didn't finish! - - LOG(3, 0, 0, "End regular cleanup (%d actions), next in %d seconds\n", count, config->cleanup_interval); - return 0; + LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n", + t_slice, r_slice, s_slice, t_actions, r_actions, s_actions); } - // // Are we in the middle of a tunnel update, or radius // requests?? @@ -2812,6 +3037,53 @@ static int still_busy(void) int i; static clockt last_talked = 0; static clockt start_busy_wait = 0; + + if (!config->cluster_iam_master) + { +#ifdef BGP + static time_t stopped_bgp = 0; + if (bgp_configured) + { + if (!stopped_bgp) + { + LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY); + + for (i = 0; i < BGP_NUM_PEERS; i++) + if (bgp_peers[i].state == Established) + bgp_stop(&bgp_peers[i]); + + stopped_bgp = time_now; + + // we don't want to become master + cluster_send_ping(0); + + return 1; + } + + if (time_now < (stopped_bgp + QUIT_DELAY)) + return 1; + } +#endif /* BGP */ + + return 0; + } + + if (main_quit == QUIT_SHUTDOWN) + { + static int dropped = 0; + if (!dropped) + { + int i; + + LOG(1, 0, 0, "Dropping sessions and tunnels\n"); + for (i = 1; i < MAXTUNNEL; i++) + if (tunnel[i].ip || tunnel[i].state) + tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0); + + dropped = 1; + } + } + if (start_busy_wait == 0) start_busy_wait = TIME; @@ -2853,80 +3125,116 @@ static int still_busy(void) return 0; } -static fd_set readset; -static int readset_n = 0; +#ifdef HAVE_EPOLL +# include +#else +# define FAKE_EPOLL_IMPLEMENTATION /* include the functions */ +# include "fake_epoll.h" +#endif + +// the base set of fds polled: cli, cluster, tun, udp, control, dae +#define BASE_FDS 6 + +// additional polled fds +#ifdef BGP +# define EXTRA_FDS BGP_NUM_PEERS +#else +# define EXTRA_FDS 0 +#endif // main loop - gets packets on tun or udp and processes them static void mainloop(void) { int i; uint8_t buf[65536]; - 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, "Beginning of main loop. udpfd=%d, tunfd=%d, cluster_sockfd=%d, controlfd=%d\n", - udpfd, tunfd, cluster_sockfd, controlfd); - - FD_ZERO(&readset); - FD_SET(udpfd, &readset); - FD_SET(tunfd, &readset); - FD_SET(controlfd, &readset); - FD_SET(clifd, &readset); - if (cluster_sockfd) FD_SET(cluster_sockfd, &readset); - readset_n = udpfd; - if (tunfd > readset_n) readset_n = tunfd; - if (controlfd > readset_n) readset_n = controlfd; - if (clifd > readset_n) readset_n = clifd; - if (cluster_sockfd > readset_n) readset_n = cluster_sockfd; + struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS]; + int maxevent = sizeof(events)/sizeof(*events); - while (!main_quit || still_busy()) + if ((epollfd = epoll_create(maxevent)) < 0) { - fd_set r; - int n = readset_n; + LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno)); + exit(1); + } + + LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n", + clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd); + + /* setup our fds to poll for input */ + { + static struct event_data d[BASE_FDS]; + struct epoll_event e; + + e.events = EPOLLIN; + i = 0; + + d[i].type = FD_TYPE_CLI; + e.data.ptr = &d[i++]; + epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e); + + d[i].type = FD_TYPE_CLUSTER; + e.data.ptr = &d[i++]; + epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e); + + d[i].type = FD_TYPE_TUN; + e.data.ptr = &d[i++]; + epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e); + + d[i].type = FD_TYPE_UDP; + e.data.ptr = &d[i++]; + epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e); + + d[i].type = FD_TYPE_CONTROL; + e.data.ptr = &d[i++]; + epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e); + + d[i].type = FD_TYPE_DAE; + e.data.ptr = &d[i++]; + epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e); + } + #ifdef BGP - fd_set w; - int bgp_set[BGP_NUM_PEERS]; + signal(SIGPIPE, SIG_IGN); + bgp_setup(config->as_number); + if (config->bind_address) + bgp_add_route(config->bind_address, 0xffffffff); + + for (i = 0; i < BGP_NUM_PEERS; i++) + { + if (config->neighbour[i].name[0]) + bgp_start(&bgp_peers[i], config->neighbour[i].name, + config->neighbour[i].as, config->neighbour[i].keepalive, + config->neighbour[i].hold, 0); /* 0 = routing disabled */ + } #endif /* BGP */ - if (config->reload_config) - { - // Update the config state based on config settings - update_config(); - } + while (!main_quit || still_busy()) + { + int more = 0; + int n; - memcpy(&r, &readset, sizeof(fd_set)); - to.tv_sec = 0; - to.tv_usec = 100000; // 1/10th of a second. -#ifdef BGP - FD_ZERO(&w); - for (i = 0; i < BGP_NUM_PEERS; i++) + if (main_reload) { - bgp_set[i] = bgp_select_state(&bgp_peers[i]); - if (bgp_set[i] & 1) - { - FD_SET(bgp_peers[i].sock, &r); - if (bgp_peers[i].sock > n) - n = bgp_peers[i].sock; - } + main_reload = 0; + read_config_file(); + config->reload_config++; + } - if (bgp_set[i] & 2) - { - FD_SET(bgp_peers[i].sock, &w); - if (bgp_peers[i].sock > n) - n = bgp_peers[i].sock; - } + if (config->reload_config) + { + config->reload_config = 0; + update_config(); } - n = select(n + 1, &r, &w, 0, &to); -#else /* BGP */ - n = select(n + 1, &r, 0, 0, &to); +#ifdef BGP + bgp_set_poll(); #endif /* BGP */ + n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec) STAT(select_called); - TIME = now(); + TIME = now(NULL); if (n < 0) { if (errno == EINTR || @@ -2934,70 +3242,92 @@ static void mainloop(void) continue; LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno)); - main_quit++; - break; + break; // exit } - else if (n) + + if (n) { struct sockaddr_in addr; - int alen, c, s; + socklen_t alen; + int c, s; + int udp_ready = 0; + int tun_ready = 0; + int cluster_ready = 0; int udp_pkts = 0; int tun_pkts = 0; int cluster_pkts = 0; +#ifdef BGP + uint32_t bgp_events[BGP_NUM_PEERS]; + memset(bgp_events, 0, sizeof(bgp_events)); +#endif /* BGP */ - // 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) + for (c = n, i = 0; i < c; i++) { - for (i = 0; i < config->num_radfds; i++) + struct event_data *d = events[i].data.ptr; + switch (d->type) + { + case FD_TYPE_CLI: // CLI connections { - if (FD_ISSET(radfds[i], &r)) + int cli; + + alen = sizeof(addr); + if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0) { - processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i); - n--; + cli_do(cli); + close(cli); } - } - } + else + LOG(0, 0, 0, "accept error: %s\n", strerror(errno)); - // CLI connections - if (FD_ISSET(clifd, &r)) - { - int cli; - - alen = sizeof(addr); - if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0) - { - cli_do(cli); - close(cli); + n--; + break; } - else - LOG(0, 0, 0, "accept error: %s\n", strerror(errno)); - n--; - } + // these are handled below, with multiple interleaved reads + case FD_TYPE_CLUSTER: cluster_ready++; break; + case FD_TYPE_TUN: tun_ready++; break; + case FD_TYPE_UDP: udp_ready++; break; + + case FD_TYPE_CONTROL: // nsctl commands + alen = sizeof(addr); + processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen); + n--; + break; + + case FD_TYPE_DAE: // DAE requests + alen = sizeof(addr); + processdae(buf, recvfrom(daefd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen); + n--; + break; + + case FD_TYPE_RADIUS: // RADIUS response + s = recv(radfds[d->index], buf, sizeof(buf), 0); + if (s >= 0 && config->cluster_iam_master) + processrad(buf, s, d->index); + + n--; + break; #ifdef BGP - for (i = 0; i < BGP_NUM_PEERS; i++) - { - 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--; + case FD_TYPE_BGP: + bgp_events[d->index] = events[i].events; + n--; + break; +#endif /* BGP */ + + default: + LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type); + } } + +#ifdef BGP + bgp_process(bgp_events); #endif /* BGP */ for (c = 0; n && c < config->multi_read_count; c++) { // L2TP - if (FD_ISSET(udpfd, &r)) + if (udp_ready) { alen = sizeof(addr); if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0) @@ -3007,13 +3337,13 @@ static void mainloop(void) } else { - FD_CLR(udpfd, &r); + udp_ready = 0; n--; } } // incoming IP - if (FD_ISSET(tunfd, &r)) + if (tun_ready) { if ((s = read(tunfd, buf, sizeof(buf))) > 0) { @@ -3022,13 +3352,13 @@ static void mainloop(void) } else { - FD_CLR(tunfd, &r); + tun_ready = 0; n--; } } // cluster - if (FD_ISSET(cluster_sockfd, &r)) + if (cluster_ready) { alen = sizeof(addr); if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0) @@ -3038,7 +3368,7 @@ static void mainloop(void) } else { - FD_CLR(cluster_sockfd, &r); + cluster_ready = 0; n--; } } @@ -3053,11 +3383,41 @@ static void mainloop(void) config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts); STAT(multi_read_exceeded); + more++; + } + } + + if (time_changed) + { + double Mbps = 1024.0 * 1024.0 / 8 * time_changed; + + // Log current traffic stats + snprintf(config->bandwidth, sizeof(config->bandwidth), + "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u", + (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps), + ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps), + udp_rx_pkt / time_changed, eth_rx_pkt / time_changed); + + udp_tx = udp_rx = 0; + udp_rx_pkt = eth_rx_pkt = 0; + eth_tx = eth_rx = 0; + time_changed = 0; + + if (config->dump_speed) + printf("%s\n", config->bandwidth); + + // Update the internal time counter + strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now)); + + { + // Run timer hooks + struct param_timer p = { time_now }; + run_plugins(PLUGIN_TIMER, &p); } } // Runs on every machine (master and slaves). - if (cluster_sockfd && next_cluster_ping <= TIME) + if (next_cluster_ping <= TIME) { // Check to see which of the cluster is still alive.. @@ -3075,9 +3435,11 @@ static 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) @@ -3087,20 +3449,42 @@ static void mainloop(void) } } - /* Handle timeouts. Make sure that this gets run anyway, even if there was - * something to read, else under load this will never actually run.... - * - */ - if (config->cluster_iam_master && next_clean <= time_now) + // Handle timeouts, retries etc. + { + static double last_clean = 0; + double this_clean; + double diff; + + TIME = now(&this_clean); + diff = this_clean - last_clean; + + // Run during idle time (after we've handled + // all incoming packets) or every 1/10th sec + if (!more || diff > 0.1) + { + regular_cleanups(diff); + last_clean = this_clean; + } + } + + if (*config->accounting_dir) { - if (regular_cleanups()) + static clockt next_acct = 0; + static clockt next_shut_acct = 0; + + if (next_acct <= TIME) { - // Did it finish? - next_clean = time_now + 1 ; // Didn't finish. Check quickly. + // Dump accounting data + next_acct = TIME + ACCT_TIME; + next_shut_acct = TIME + ACCT_SHUT_TIME; + dump_acct_info(1); } - else + else if (next_shut_acct <= TIME) { - next_clean = time_now + config->cleanup_interval; // Did. Move to next interval. + // Dump accounting data for shutdown sessions + next_shut_acct = TIME + ACCT_SHUT_TIME; + if (shut_acct_n) + dump_acct_info(0); } } } @@ -3115,6 +3499,7 @@ static void mainloop(void) // // Important!!! We MUST not process any packets past this point! + LOG(1, 0, 0, "Shutdown complete\n"); } static void stripdomain(char *host) @@ -3199,6 +3584,11 @@ static void initdata(int optdebug, char *optconfig) config->debug = optdebug; config->num_tbfs = MAXTBFS; config->rl_rate = 28; // 28kbps + config->cluster_mcast_ttl = 1; + config->cluster_master_min_adv = 1; + config->ppp_restart_time = 3; + config->ppp_max_configure = 10; + config->ppp_max_failure = 5; strcpy(config->random_device, RANDOMDEVICE); log_stream = stderr; @@ -3566,7 +3956,7 @@ static void initippool() LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1); } -void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port) +void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port) { struct sockaddr_in snoop_addr = {0}; if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet) @@ -3588,7 +3978,7 @@ void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint1 static int dump_session(FILE **f, sessiont *s) { - if (!s->opened || !s->ip || !(s->cin || s->cout) || !*s->user || s->walled_garden) + if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden) return 1; if (!*f) @@ -3609,10 +3999,12 @@ static int dump_session(FILE **f, sessiont *s) LOG(3, 0, 0, "Dumping accounting information to %s\n", filename); fprintf(*f, "# dslwatch.pl dump file V1.01\n" "# host: %s\n" + "# endpoint: %s\n" "# time: %ld\n" "# uptime: %ld\n" "# format: username ip qos uptxoctets downrxoctets\n", hostname, + fmtaddr(config->bind_address ? config->bind_address : my_address, 0), now, now - basetime); } @@ -3622,11 +4014,10 @@ static int dump_session(FILE **f, sessiont *s) 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 + (uint32_t) s->cin_delta, // uptxoctets + (uint32_t) s->cout_delta); // downrxoctets - s->pin = s->cin = 0; - s->pout = s->cout = 0; + s->cin_delta = s->cout_delta = 0; return 1; } @@ -3700,14 +4091,13 @@ int main(int argc, char *argv[]) // Start the timer routine off time(&time_now); strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now)); - signal(SIGALRM, sigalrm_handler); - siginterrupt(SIGALRM, 0); initplugins(); initdata(optdebug, optconfig); init_cli(hostname); read_config_file(); + update_config(); init_tbf(config->num_tbfs); LOG(0, 0, 0, "L2TPNS version " VERSION "\n"); @@ -3754,19 +4144,6 @@ int main(int argc, char *argv[]) if (cluster_init() < 0) exit(1); -#ifdef BGP - signal(SIGPIPE, SIG_IGN); - bgp_setup(config->as_number); - bgp_add_route(config->bind_address, 0xffffffff); - for (i = 0; i < BGP_NUM_PEERS; i++) - { - if (config->neighbour[i].name[0]) - bgp_start(&bgp_peers[i], config->neighbour[i].name, - config->neighbour[i].as, config->neighbour[i].keepalive, - config->neighbour[i].hold, 0); /* 0 = routing disabled */ - } -#endif /* BGP */ - inittun(); LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice); @@ -3774,11 +4151,18 @@ int main(int argc, char *argv[]) initrad(); initippool(); - signal(SIGHUP, sighup_handler); - signal(SIGTERM, sigterm_handler); - signal(SIGINT, sigterm_handler); - signal(SIGQUIT, sigquit_handler); + // seed prng + { + unsigned seed = time_now ^ getpid(); + LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed); + srand(seed); + } + + signal(SIGHUP, sighup_handler); signal(SIGCHLD, sigchild_handler); + signal(SIGTERM, shutdown_handler); + signal(SIGINT, shutdown_handler); + signal(SIGQUIT, shutdown_handler); // Prevent us from getting paged out if (config->lock_pages) @@ -3789,22 +4173,12 @@ int main(int argc, char *argv[]) LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno)); } - alarm(1); - // Drop privileges here if (config->target_uid > 0 && geteuid() == 0) setuid(config->target_uid); mainloop(); -#ifdef BGP - /* try to shut BGP down cleanly; with luck the sockets will be - writable since we're out of the select */ - for (i = 0; i < BGP_NUM_PEERS; i++) - if (bgp_peers[i].state == Established) - bgp_stop(&bgp_peers[i]); -#endif /* BGP */ - /* remove plugins (so cleanup code gets run) */ plugins_done(); @@ -3820,77 +4194,12 @@ int main(int argc, char *argv[]) static void sighup_handler(int sig) { - if (log_stream) - { - if (log_stream != stderr) - fclose(log_stream); - - log_stream = NULL; - } - - read_config_file(); -} - -static void sigalrm_handler(int sig) -{ - // Log current traffic stats - - snprintf(config->bandwidth, sizeof(config->bandwidth), - "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u", - (udp_rx / 1024.0 / 1024.0 * 8), - (eth_tx / 1024.0 / 1024.0 * 8), - (eth_rx / 1024.0 / 1024.0 * 8), - (udp_tx / 1024.0 / 1024.0 * 8), - ((udp_tx + udp_rx + eth_tx + eth_rx) / 1024.0 / 1024.0 * 8), - udp_rx_pkt, eth_rx_pkt); - - udp_tx = udp_rx = 0; - udp_rx_pkt = eth_rx_pkt = 0; - eth_tx = eth_rx = 0; - - if (config->dump_speed) - printf("%s\n", config->bandwidth); - - // Update the internal time counter - time(&time_now); - strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now)); - alarm(1); - - { - // Run timer hooks - struct param_timer p = { time_now }; - run_plugins(PLUGIN_TIMER, &p); - } - -} - -static void sigterm_handler(int sig) -{ - LOG(1, 0, 0, "Shutting down cleanly\n"); - main_quit++; + main_reload++; } -static void sigquit_handler(int sig) +static void shutdown_handler(int sig) { - int i; - - LOG(1, 0, 0, "Shutting down without saving sessions\n"); - - if (config->cluster_iam_master) - { - 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", 6, 0, 0); - } - } - - main_quit++; + main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER; } static void sigchild_handler(int sig) @@ -3899,12 +4208,12 @@ static void sigchild_handler(int sig) ; } -static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_length, char **challenge_response) +static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response) { MD5_CTX ctx; *challenge_response = NULL; - if (!*config->l2tpsecret) + if (!*config->l2tp_secret) { LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n"); return; @@ -3912,13 +4221,13 @@ static void build_chap_response(char *challenge, uint8_t id, uint16_t challenge_ LOG(4, 0, 0, " Building challenge response for CHAP request\n"); - *challenge_response = (char *)calloc(17, 1); + *challenge_response = calloc(17, 1); - MD5Init(&ctx); - MD5Update(&ctx, &id, 1); - MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); - MD5Update(&ctx, challenge, challenge_length); - MD5Final(*challenge_response, &ctx); + MD5_Init(&ctx); + MD5_Update(&ctx, &id, 1); + MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret)); + MD5_Update(&ctx, challenge, challenge_length); + MD5_Final(*challenge_response, &ctx); return; } @@ -3983,6 +4292,17 @@ static void update_config() setbuf(log_stream, NULL); } +#define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc) +#define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp + + if (config->l2tp_mtu <= 0) config->l2tp_mtu = PPPMTU; + else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU; + else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU; + + // reset MRU/MSS globals + MRU = config->l2tp_mtu - L2TP_HDRS; + MSS = MRU - TCP_HDRS; + // Update radius config->numradiusservers = 0; for (i = 0; i < MAXRADSERVER; i++) @@ -4005,8 +4325,6 @@ static void update_config() if (!config->numradiusservers) LOG(0, 0, 0, "No RADIUS servers defined!\n"); - config->num_radfds = 2 << RADIUS_SHIFT; - // parse radius_authtypes_s config->radius_authtypes = config->radius_authprefer = 0; p = config->radius_authtypes_s; @@ -4059,6 +4377,9 @@ static void update_config() strcat(config->radius_authtypes_s, ", pap"); } + if (!config->radius_dae_port) + config->radius_dae_port = DAEPORT; + // re-initialise the random number source initrandom(config->random_device); @@ -4081,7 +4402,6 @@ static 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) @@ -4128,8 +4448,6 @@ static void update_config() LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno)); } } - - config->reload_config = 0; } static void read_config_file() @@ -4147,10 +4465,9 @@ static void read_config_file() cli_do_file(f); LOG(3, 0, 0, "Done reading config file\n"); fclose(f); - update_config(); } -int sessionsetup(tunnelidt t, sessionidt s) +int sessionsetup(sessionidt s, tunnelidt t) { // A session now exists, set it up in_addr_t ip; @@ -4168,7 +4485,7 @@ int sessionsetup(tunnelidt t, sessionidt s) if (!session[s].ip) { LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n"); - sessionshutdown(s, "No IP addresses available.", 2, 7); + sessionshutdown(s, "No IP addresses available.", 2, 7); // try another return 0; } LOG(3, s, t, " No IP allocated. Assigned %s from pool\n", @@ -4188,8 +4505,16 @@ int sessionsetup(tunnelidt t, sessionidt s) for (i = 1; i <= config->cluster_highest_sessionid; i++) { if (i == s) continue; - if (ip == session[i].ip) sessionkill(i, "Duplicate IP address"); - if (!session[s].walled_garden && !session[i].walled_garden && strcasecmp(user, session[i].user) == 0) + if (!session[s].opened) continue; + if (ip == session[i].ip) + { + sessionkill(i, "Duplicate IP address"); + continue; + } + + if (config->allow_duplicate_users) continue; + if (session[s].walled_garden || session[i].walled_garden) continue; + if (!strcasecmp(user, session[i].user)) sessionkill(i, "Duplicate session for users"); } } @@ -4220,13 +4545,8 @@ int sessionsetup(tunnelidt t, sessionidt s) cache_ipmap(session[s].ip, s); } - if (!session[s].unique_id) - { - // did this session just finish radius? - LOG(3, s, t, "Sending initial IPCP to client\n"); - sendipcp(t, s); - session[s].unique_id = ++last_id; - } + sess_local[s].lcp_authtype = 0; // RADIUS authentication complete + lcp_open(s, t); // transition to Network phase and send initial IPCP // Run the plugin's against this new session. { @@ -4335,7 +4655,7 @@ int load_session(sessionidt s, sessiont *new) } // check v6 routing - if (new->flags & SF_IPV6_ROUTED && !(session[s].flags & SF_IPV6_ROUTED)) + if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened) route6set(s, new->ipv6route, new->ipv6prefixlen, 1); // check filters @@ -4367,12 +4687,6 @@ 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 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. @@ -4558,7 +4872,7 @@ static void plugins_done() run_plugin_done(p); } -static void processcontrol(uint8_t * buf, int len, struct sockaddr_in *addr, int alen) +static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen) { struct nsctl request; struct nsctl response; @@ -4757,6 +5071,9 @@ static tunnelidt new_tunnel() void become_master(void) { int s, i; + static struct event_data d[RADIUS_FDS]; + struct epoll_event e; + run_plugins(PLUGIN_BECOME_MASTER, NULL); // running a bunch of iptables commands is slow and can cause @@ -4775,11 +5092,14 @@ void become_master(void) } // add radius fds - for (i = 0; i < config->num_radfds; i++) + e.events = EPOLLIN; + for (i = 0; i < RADIUS_FDS; i++) { - FD_SET(radfds[i], &readset); - if (radfds[i] > readset_n) - readset_n = radfds[i]; + d[i].type = FD_TYPE_RADIUS; + d[i].index = i; + e.data.ptr = &d[i]; + + epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e); } } @@ -4873,14 +5193,14 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec uint8_t digest[16]; uint8_t *last; size_t d = 0; + uint16_t m = htons(type); // Compute initial pad - MD5Init(&ctx); - MD5Update(&ctx, (uint8_t) (type >> 8) & 0xff, 1); - MD5Update(&ctx, (uint8_t) type & 0xff, 1); - MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); - MD5Update(&ctx, vector, vec_len); - MD5Final(digest, &ctx); + MD5_Init(&ctx); + MD5_Update(&ctx, (unsigned char *) &m, 2); + MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret)); + MD5_Update(&ctx, vector, vec_len); + MD5_Final(digest, &ctx); // pointer to last decoded 16 octets last = value; @@ -4890,10 +5210,10 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec // calculate a new pad based on the last decoded block if (d >= sizeof(digest)) { - MD5Init(&ctx); - MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret)); - MD5Update(&ctx, last, sizeof(digest)); - MD5Final(digest, &ctx); + MD5_Init(&ctx); + MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret)); + MD5_Update(&ctx, last, sizeof(digest)); + MD5_Final(digest, &ctx); d = 0; last = value; @@ -4904,6 +5224,31 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec } } +int find_filter(char const *name, size_t len) +{ + int free = -1; + int i; + + for (i = 0; i < MAXFILTER; i++) + { + if (!*ip_filters[i].name) + { + if (free < 0) + free = i; + + continue; + } + + if (strlen(ip_filters[i].name) != len) + continue; + + if (!strncmp(ip_filters[i].name, name, len)) + return i; + } + + return free; +} + static int ip_filter_port(ip_filter_portt *p, uint16_t port) { switch (p->op) @@ -4989,7 +5334,9 @@ int ip_filter(uint8_t *buf, int len, uint8_t filter) if (frag_offset) { - if (!rule->frag || rule->action == FILTER_ACTION_DENY) + // layer 4 deny rules are skipped + if (rule->action == FILTER_ACTION_DENY && + (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op)) continue; } else