X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/715e74f4c7f18be79bf019f53ce3404382413f99..c03782046a6436da4bdce706318b95905fc99455:/cluster.c diff --git a/cluster.c b/cluster.c index 549edfd..c529fea 100644 --- a/cluster.c +++ b/cluster.c @@ -1,6 +1,6 @@ // L2TPNS Clustering Stuff -char const *cvs_id_cluster = "$Id: cluster.c,v 1.34 2005/05/02 09:06:05 bodea Exp $"; +char const *cvs_id_cluster = "$Id: cluster.c,v 1.39 2005/05/26 12:17:30 bodea Exp $"; #include #include @@ -193,7 +193,7 @@ static void add_type(char **p, int type, int more, char *data, int size) } // advertise our presence via BGP or gratuitous ARP -static void advertise(void) +static void advertise_routes(void) { #ifdef BGP if (bgp_configured) @@ -204,6 +204,15 @@ static void advertise(void) send_garp(config->bind_address); // Start taking traffic. } +// withdraw our routes (BGP only) +static void withdraw_routes(void) +{ +#ifdef BGP + if (bgp_configured) + bgp_enable_routing(0); +#endif /* BGP */ +} + static void cluster_uptodate(void) { if (config->cluster_iam_uptodate) @@ -215,7 +224,7 @@ static void cluster_uptodate(void) config->cluster_iam_uptodate = 1; LOG(0, 0, 0, "Now uptodate with master.\n"); - advertise(); + advertise_routes(); } // @@ -457,17 +466,22 @@ void cluster_check_slaves(void) continue; // Shutdown peer! Skip them. if (peers[i].uptodate) - have_peers = 1; - - if (!peers[i].uptodate) + have_peers++; + else config->cluster_iam_uptodate = 0; // Start fast heartbeats } -#ifdef BGP - // in a cluster, withdraw/add routes when we get a peer/lose all peers - if (bgp_configured && have_peers != had_peers) - bgp_enable_routing(!have_peers); -#endif /* BGP */ + // in a cluster, withdraw/add routes when we get a peer/lose peers + if (have_peers != had_peers) + { + if (had_peers < config->cluster_master_min_adv && + have_peers >= config->cluster_master_min_adv) + withdraw_routes(); + + else if (had_peers >= config->cluster_master_min_adv && + have_peers < config->cluster_master_min_adv) + advertise_routes(); + } } // @@ -480,20 +494,22 @@ void cluster_check_master(void) int last_free = 0; clockt t = TIME; static int probed = 0; + int have_peers; if (config->cluster_iam_master) return; // Only runs on the slaves... // If the master is late (missed 2 hearbeats by a second and a // hair) it may be that the switch has dropped us from the - // multicast group, try unicasting one probe to the master + // multicast group, try unicasting probes to the master // which will hopefully respond with a unicast heartbeat that // will allow us to limp along until the querier next runs. - if (TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11)) + if (config->cluster_master_address + && TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11)) { - if (!probed && config->cluster_master_address) + if (!probed || (TIME > (probed + 2 * config->cluster_hb_interval))) { - probed = 1; + probed = TIME; LOG(1, 0, 0, "Heartbeat from master %.1fs late, probing...\n", 0.1 * (TIME - (config->cluster_last_hb + config->cluster_hb_interval))); @@ -511,7 +527,7 @@ void cluster_check_master(void) LOG(0, 0, 0, "Master timed out! Holding election...\n"); - for (i = 0; i < num_peers; i++) + for (i = have_peers = 0; i < num_peers; i++) { if ((peers[i].timestamp + config->cluster_hb_timeout) < t) continue; // Stale peer! Skip them. @@ -529,6 +545,9 @@ void cluster_check_master(void) LOG(1, 0, 0, "Expecting %s to become master\n", fmtaddr(peers[i].peer, 0)); return; // They'll win the election. Wait for them to come up. } + + if (peers[i].uptodate) + have_peers++; } // Wow. it's been ages since I last heard a heartbeat @@ -540,6 +559,11 @@ void cluster_check_master(void) LOG(0, 0, 0, "I am declaring myself the master!\n"); + if (have_peers < config->cluster_master_min_adv) + advertise_routes(); + else + withdraw_routes(); + if (config->cluster_seq_number == -1) config->cluster_seq_number = 0; @@ -594,7 +618,7 @@ void cluster_check_master(void) sess_local[i].cin = sess_local[i].cout = 0; - session[i].radius = 0; // Reset authentication as the radius blocks aren't up to date. + sess_local[i].radius = 0; // Reset authentication as the radius blocks aren't up to date. if (session[i].unique_id >= high_unique_id) // This is different to the index into the session table!!! high_unique_id = session[i].unique_id+1; @@ -620,9 +644,6 @@ void cluster_check_master(void) config->cluster_undefined_tunnels = 0; config->cluster_iam_uptodate = 1; // assume all peers are up-to-date - if (!num_peers) // lone master - advertise(); - // FIXME. We need to fix up the tunnel control message // queue here! There's a number of other variables we // should also update. @@ -902,6 +923,13 @@ static int cluster_catchup_slave(int seq, in_addr_t slave) int diff; LOG(1, 0, 0, "Slave %s sent LASTSEEN with seq %d\n", fmtaddr(slave, 0), seq); + if (!config->cluster_iam_master) { + LOG(1, 0, 0, "Got LASTSEEN but I'm not a master! Redirecting it to %s.\n", + fmtaddr(config->cluster_master_address, 0)); + + peer_send_message(slave, C_MASTER, config->cluster_master_address, NULL, 0); + return 0; + } diff = config->cluster_seq_number - seq; // How many packet do we need to send? if (diff < 0) @@ -913,9 +941,11 @@ static int cluster_catchup_slave(int seq, in_addr_t slave) return peer_send_message(slave, C_KILL, seq, NULL, 0);// Kill the slave. Nothing else to do. } + LOG(1, 0, 0, "Sending %d catchup packets to slave %s\n", diff, fmtaddr(slave, 0) ); + // Now resend every packet that it missed, in order. while (seq != config->cluster_seq_number) { - s = seq%HB_HISTORY_SIZE; + s = seq % HB_HISTORY_SIZE; if (seq != past_hearts[s].seq) { LOG(0, 0, 0, "Tried to re-send heartbeat for %s but %d doesn't match %d! (%d,%d)\n", fmtaddr(slave, 0), seq, past_hearts[s].seq, s, config->cluster_seq_number); @@ -968,8 +998,10 @@ static int cluster_add_peer(in_addr_t peer, time_t basetime, pingt *pp, int size } // Is this the master shutting down?? - if (peer == config->cluster_master_address && !basetime) { - LOG(3, 0, 0, "Master %s shutting down...\n", fmtaddr(config->cluster_master_address, 0)); + if (peer == config->cluster_master_address) { + LOG(3, 0, 0, "Master %s %s\n", fmtaddr(config->cluster_master_address, 0), + basetime ? "has restarted!" : "shutting down..."); + config->cluster_master_address = 0; config->cluster_last_hb = 0; // Force an election. cluster_check_master(); @@ -1010,6 +1042,20 @@ static int cluster_add_peer(in_addr_t peer, time_t basetime, pingt *pp, int size return 1; } +// A slave responds with C_MASTER when it gets a message which should have gone to a master. +static int cluster_set_master(in_addr_t peer, in_addr_t master) +{ + if (config->cluster_iam_master) // Sanity... + return 0; + + LOG(3, 0, 0, "Peer %s set the master to %s...\n", fmtaddr(peer, 0), + fmtaddr(master, 1)); + + config->cluster_master_address = master; + cluster_check_master(); + return 0; +} + /* Handle the slave updating the byte counters for the master. */ // // Note that we don't mark the session as dirty; We rely on @@ -1112,24 +1158,127 @@ static int cluster_recv_tunnel(int more, uint8_t *p) } +// pre v5 heartbeat session structure +struct oldsession { + sessionidt next; + sessionidt far; + tunnelidt tunnel; + in_addr_t ip; + int ip_pool_index; + unsigned long unique_id; + uint16_t nr; + uint16_t ns; + uint32_t magic; + uint32_t cin, cout; + uint32_t pin, pout; + uint32_t total_cin; + uint32_t total_cout; + uint32_t id; + uint16_t throttle_in; + uint16_t throttle_out; + clockt opened; + clockt die; + time_t last_packet; + in_addr_t dns1, dns2; + routet route[MAXROUTE]; + uint16_t radius; + uint16_t mru; + uint16_t tbf_in; + uint16_t tbf_out; + uint8_t l2tp_flags; + uint8_t reserved_old_snoop; + uint8_t walled_garden; + uint8_t flags1; + char random_vector[MAXTEL]; + int random_vector_length; + char user[129]; + char called[MAXTEL]; + char calling[MAXTEL]; + uint32_t tx_connect_speed; + uint32_t rx_connect_speed; + uint32_t flags; + in_addr_t snoop_ip; + uint16_t snoop_port; + uint16_t sid; + uint8_t filter_in; + uint8_t filter_out; + char reserved[18]; +}; + +static uint8_t *convert_session(struct oldsession *old) +{ + static sessiont new; + int i; + + memset(&new, 0, sizeof(new)); + + new.next = old->next; + new.far = old->far; + new.tunnel = old->tunnel; + new.l2tp_flags = old->l2tp_flags; + new.flags = old->flags; + new.ip = old->ip; + new.ip_pool_index = old->ip_pool_index; + new.unique_id = old->unique_id; + new.nr = old->nr; + new.ns = old->ns; + new.magic = old->magic; + new.cin = old->cin; + new.cout = old->cout; + new.pin = old->pin; + new.pout = old->pout; + new.total_cin = old->total_cin; + new.total_cout = old->total_cout; + new.throttle_in = old->throttle_in; + new.throttle_out = old->throttle_out; + new.filter_in = old->filter_in; + new.filter_out = old->filter_out; + new.mru = old->mru; + new.opened = old->opened; + new.die = old->die; + new.last_packet = old->last_packet; + new.dns1 = old->dns1; + new.dns2 = old->dns2; + new.tbf_in = old->tbf_in; + new.tbf_out = old->tbf_out; + new.random_vector_length = old->random_vector_length; + new.tx_connect_speed = old->tx_connect_speed; + new.rx_connect_speed = old->rx_connect_speed; + new.snoop_ip = old->snoop_ip; + new.snoop_port = old->snoop_port; + new.walled_garden = old->walled_garden; + + memcpy(new.random_vector, old->random_vector, sizeof(new.random_vector)); + memcpy(new.user, old->user, sizeof(new.user)); + memcpy(new.called, old->called, sizeof(new.called)); + memcpy(new.calling, old->calling, sizeof(new.calling)); + + for (i = 0; i < MAXROUTE; i++) + memcpy(&new.route[i], &old->route[i], sizeof(new.route[i])); + + return (uint8_t *) &new; +} + // // Process a heartbeat.. // // v3: added interval, timeout // v4: added table_version +// v5: added ipv6, re-ordered session structure static int cluster_process_heartbeat(uint8_t *data, int size, int more, uint8_t *p, in_addr_t addr) { heartt *h; int s = size - (p-data); int i, type; + int hb_ver = more; -#if HB_VERSION != 4 +#if HB_VERSION != 5 # error "need to update cluster_process_heartbeat()" #endif - // we handle versions 3 through 4 - if (more < 3 || more > HB_VERSION) { - LOG(0, 0, 0, "Received a heartbeat version that I don't support (%d)!\n", more); + // we handle versions 3 through 5 + if (hb_ver < 3 || hb_ver > HB_VERSION) { + LOG(0, 0, 0, "Received a heartbeat version that I don't support (%d)!\n", hb_ver); return -1; // Ignore it?? } @@ -1153,7 +1302,7 @@ static int cluster_process_heartbeat(uint8_t *data, int size, int more, uint8_t return -1; // Skip it. } - if (more >= 4) { + if (hb_ver >= 4) { if (h->table_version > config->cluster_table_version) { LOG(0, 0, 0, "They've seen more state changes (%" PRIu64 " vs my %" PRIu64 ") so I'm gone!\n", h->table_version, config->cluster_table_version); @@ -1180,9 +1329,33 @@ static int cluster_process_heartbeat(uint8_t *data, int size, int more, uint8_t exit(1); } + // + // Send it a unicast heartbeat to see give it a chance to die. + // NOTE: It's actually safe to do seq-number - 1 without checking + // for wrap around. + // + cluster_catchup_slave(config->cluster_seq_number - 1, addr); + return -1; // Skip it. } + // + // Try and guard against a stray master appearing. + // + // Ignore heartbeats received from another master before the + // timeout (less a smidgen) for the old master has elapsed. + // + // Note that after a clean failover, the cluster_master_address + // is cleared, so this doesn't run. + // + if (config->cluster_master_address && addr != config->cluster_master_address + && (config->cluster_last_hb + config->cluster_hb_timeout - 11) > TIME) { + LOG(0, 0, 0, "Ignoring stray heartbeat from %s, current master %s has not yet timed out (last heartbeat %.1f seconds ago).\n", + fmtaddr(addr, 0), fmtaddr(config->cluster_master_address, 1), + 0.1 * (TIME - config->cluster_last_hb)); + return -1; // ignore + } + if (config->cluster_seq_number == -1) // Don't have one. Just align to the master... config->cluster_seq_number = h->seq; @@ -1261,6 +1434,18 @@ static int cluster_process_heartbeat(uint8_t *data, int size, int more, uint8_t size = rle_decompress((uint8_t **) &p, s, c, sizeof(c) ); s -= (p - orig_p); + // session struct changed with v5 + if (hb_ver < 5) + { + if (size != sizeof(struct oldsession)) { + LOG(0, 0, 0, "DANGER: Received a v%d CSESSION that didn't decompress correctly!\n", hb_ver); + // Now what? Should exit! No-longer up to date! + break; + } + cluster_recv_session(more, convert_session((struct oldsession *) c)); + break; + } + if (size != sizeof(sessiont) ) { // Ouch! Very very bad! LOG(0, 0, 0, "DANGER: Received a CSESSION that didn't decompress correctly!\n"); // Now what? Should exit! No-longer up to date! @@ -1271,6 +1456,18 @@ static int cluster_process_heartbeat(uint8_t *data, int size, int more, uint8_t break; } case C_SESSION: + if (hb_ver < 5) + { + if (s < sizeof(struct oldsession)) + goto shortpacket; + + cluster_recv_session(more, convert_session((struct oldsession *) p)); + + p += sizeof(struct oldsession); + s -= sizeof(struct oldsession); + break; + } + if ( s < sizeof(session[more])) goto shortpacket; @@ -1360,10 +1557,13 @@ int processcluster(char *data, int size, in_addr_t addr) s -= sizeof(uint32_t); switch (type) { - case C_PING: // Update the peers table. + case C_PING: // Update the peers table. return cluster_add_peer(addr, more, (pingt *) p, s); - case C_LASTSEEN: // Catch up a slave (slave missed a packet). + case C_MASTER: // Our master is wrong + return cluster_set_master(addr, more); + + case C_LASTSEEN: // Catch up a slave (slave missed a packet). return cluster_catchup_slave(more, addr); case C_FORWARD: { // Forwarded control packet. pass off to processudp. @@ -1404,6 +1604,11 @@ int processcluster(char *data, int size, in_addr_t addr) return 0; case C_BYTES: + if (!config->cluster_iam_master) { + LOG(0, 0, 0, "I'm not the master, but I got a C_BYTES from %s?\n", fmtaddr(addr, 0)); + return -1; + } + return cluster_handle_bytes(p, s); case C_KILL: // The master asked us to die!? (usually because we're too out of date).