X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/a8434db159038c2fb6b0fb12a28105f3ccba64c9..c7983582eaeac8f1e2a66cbff6bdb20aeb58ad8e:/cluster.c diff --git a/cluster.c b/cluster.c index 19666cd..a8c9310 100644 --- a/cluster.c +++ b/cluster.c @@ -1,6 +1,6 @@ // L2TPNS Clustering Stuff -char const *cvs_id_cluster = "$Id: cluster.c,v 1.5 2004/07/02 07:30:43 bodea Exp $"; +char const *cvs_id_cluster = "$Id: cluster.c,v 1.7 2004/07/07 09:09:53 bodea Exp $"; #include #include @@ -44,8 +44,6 @@ ipt my_address = 0; // The network address of my ethernet port. static int walk_session_number = 0; // The next session to send when doing the slow table walk. static int walk_tunnel_number = 0; // The next tunnel to send when doing the slow table walk. -static int hsess, fsess; // Saved copies of the highest used session id, and the first free one. - #define MAX_HEART_SIZE (8192) // Maximum size of heartbeat packet. Must be less than max IP packet size :) #define MAX_CHANGES (MAX_HEART_SIZE/(sizeof(sessiont) + sizeof(int) ) - 2) // Assumes a session is the biggest type! @@ -68,7 +66,7 @@ static struct { int uptodate; } peers[CLUSTER_MAX_SIZE]; // List of all the peers we've heard from. static int num_peers; // Number of peers in list. -static int have_peers; // At least one peer +static int have_peers; // At least one up to date peer int rle_decompress(u8 ** src_p, int ssize, u8 *dst, int dsize); int rle_compress(u8 ** src_p, int ssize, u8 *dst, int dsize); @@ -94,7 +92,7 @@ int cluster_init() if (!*config->cluster_interface) return 0; - cluster_sockfd = socket(AF_INET, SOCK_DGRAM, UDP); + cluster_sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; @@ -158,8 +156,6 @@ int cluster_send_data(void *data, int datalen) addr.sin_port = htons(CLUSTERPORT); addr.sin_family = AF_INET; -// log_hex(4, "Cluster send", data, datalen); // VERY big data packets. How about we don't.. - log(5,0,0,0, "Cluster send data: %d bytes\n", datalen); if (sendto(cluster_sockfd, data, datalen, MSG_NOSIGNAL, (void *) &addr, sizeof(addr)) < 0) @@ -202,18 +198,13 @@ void cluster_uptodate(void) log(0,0,0,0, "Now uptodate with master.\n"); - // If we're not a master, or if we have no slaves - // then start taking traffic.. - if (!config->cluster_iam_master || !have_peers) - { #ifdef BGP - if (bgp_configured) - bgp_enable_routing(1); - else + if (bgp_configured) + bgp_enable_routing(1); + else #endif /* BGP */ - if (config->send_garp) - send_garp(config->bind_address); // Start taking traffic. - } + if (config->send_garp) + send_garp(config->bind_address); // Start taking traffic. } // @@ -339,6 +330,13 @@ int master_garden_packet(sessionidt s, char *data, int size) static void send_heartbeat(int seq, char * data, int size) { int i; + static int last_seq = -1; + + if (last_seq != -1 && (seq != (last_seq+1)%HB_MAX_SEQ) ) { + log(0,0,0,0, "FATAL: Sequence number skipped! (%d != %d)\n", + seq, last_seq); + } + last_seq = seq; if (size > sizeof(past_hearts[0].data)) { log(0,0,0,0, "Tried to heartbeat something larger than the maximum packet!\n"); @@ -438,23 +436,64 @@ void cluster_check_master(void) int last_free = 0; int had_peers = have_peers; clockt t = TIME; + static int probed = 0; + + if (TIME < (config->cluster_last_hb + config->cluster_hb_timeout)) + { + // 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 + // which will hopefully respond with a unicast heartbeat that + // will allow us to limp along until the querier next runs. + if (config->cluster_master_address + && TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11)) + { + if (!probed) + { + probed = 1; + log(1, 0, 0, 0, "Heartbeat from master %.1fs late, probing...\n", + TIME - (config->cluster_last_hb + config->cluster_hb_interval)); + + peer_send_message(config->cluster_master_address, + C_LASTSEEN, config->cluster_seq_number, NULL, 0); + } + } else { // We got a recent heartbeat; reset the probe flag. + probed = 0; + } - if (TIME < (config->cluster_last_hb + config->cluster_hb_timeout) ) - return; // Everything's ok. return. + if (!config->cluster_iam_master) + return; // Everything's ok. return. - if (!config->cluster_iam_master) - log(0,0,0,0, "Master timed out! Holding election...\n"); + // Master needs to check peer state + } config->cluster_last_hb = TIME + 1; - for (i = have_peers = 0; i < num_peers ; ++i) { + if (config->cluster_iam_master) + config->cluster_iam_uptodate = 1; // cleared in loop below + else + log(0,0,0,0, "Master timed out! Holding election...\n"); + + + for (i = have_peers = 0; i < num_peers; i++) + { if ((peers[i].timestamp + config->cluster_hb_timeout) < t) continue; // Stale peer! Skip them. if (!peers[i].basetime) continue; // Shutdown peer! Skip them. - have_peers = 1; + if (peers[i].uptodate) + have_peers = 1; + + if (config->cluster_iam_master) + { + if (!peers[i].uptodate) + config->cluster_iam_uptodate = 0; // Start fast heartbeats + + continue; + } + if (peers[i].basetime < basetime) { log(1,0,0,0, "Expecting %s to become master\n", inet_toa(peers[i].peer) ); return; // They'll win the election. Get out of here. @@ -572,12 +611,11 @@ void cluster_check_master(void) config->cluster_undefined_sessions = 0; config->cluster_undefined_tunnels = 0; + config->cluster_iam_uptodate = 1; // assume all peers are up-to-date - // - // FIXME. We need to fix up the tunnel control message - // queue here! There's a number of other variables we - // should also update. - cluster_uptodate(); + // FIXME. We need to fix up the tunnel control message + // queue here! There's a number of other variables we + // should also update. } @@ -685,6 +723,7 @@ int hb_add_type(char **p, int type, int id) default: log(0,0,0,0, "Found an invalid type in heart queue! (%d)\n", type); kill(0, SIGTERM); + exit(1); } return 0; } @@ -692,31 +731,33 @@ int hb_add_type(char **p, int type, int id) // // Send a heartbeat, incidently sending out any queued changes.. // -void cluster_heartbeat(int highsession, int freesession, int hightunnel) +void cluster_heartbeat() { int i, count = 0, tcount = 0; char buff[MAX_HEART_SIZE + sizeof(heartt) + sizeof(int) ]; heartt h; - char * p = buff; + char *p = buff; if (!config->cluster_iam_master) // Only the master does this. return; - hsess = highsession; - fsess = freesession; - // Fill out the heartbeat header. + // Fill out the heartbeat header. + memset(&h, 0, sizeof(h)); + h.version = HB_VERSION; h.seq = config->cluster_seq_number; h.basetime = basetime; h.clusterid = config->bind_address; // Will this do?? h.basetime = basetime; - h.highsession = highsession; - h.freesession = freesession; - h.hightunnel = hightunnel; + h.highsession = config->cluster_highest_sessionid; + h.freesession = sessionfree; + h.hightunnel = config->cluster_highest_tunnelid; h.size_sess = sizeof(sessiont); // Just in case. h.size_tunn = sizeof(tunnelt); + h.interval = config->cluster_hb_interval; + h.timeout = config->cluster_hb_timeout; - add_type(&p, C_HEARTBEAT, HB_VERSION, (char*) &h, sizeof(h) ); + add_type(&p, C_HEARTBEAT, HB_VERSION, (char*) &h, sizeof(h)); for (i = 0; i < config->cluster_num_changes; ++i) { hb_add_type(&p, cluster_changes[i].type, cluster_changes[i].id); @@ -725,6 +766,7 @@ void cluster_heartbeat(int highsession, int freesession, int hightunnel) if (p > (buff + sizeof(buff))) { // Did we somehow manage to overun the buffer? log(0,0,0,0, "FATAL: Overran the heartbeat buffer! This is fatal. Exiting. (size %d)\n", p - buff); kill(0, SIGTERM); + exit(1); } // @@ -735,11 +777,11 @@ void cluster_heartbeat(int highsession, int freesession, int hightunnel) if (!walk_session_number) // session #0 isn't valid. ++walk_session_number; - if (count >= highsession) // If we're a small cluster, don't go wild. + if (count >= config->cluster_highest_sessionid) // If we're a small cluster, don't go wild. break; hb_add_type(&p, C_CSESSION, walk_session_number); - walk_session_number = (1+walk_session_number)%(highsession+1); // +1 avoids divide by zero. + walk_session_number = (1+walk_session_number)%(config->cluster_highest_sessionid+1); // +1 avoids divide by zero. ++count; // Count the number of extra sessions we're sending. } @@ -769,6 +811,7 @@ void cluster_heartbeat(int highsession, int freesession, int hightunnel) if (p > (buff + sizeof(buff))) { // Did we somehow manage to overun the buffer? log(0,0,0,0, "Overran the heartbeat buffer now! This is fatal. Exiting. (size %d)\n", p - buff); kill(0, SIGTERM); + exit(1); } log(3,0,0,0, "Sending heartbeat #%d with %d changes (%d x-sess, %d x-tunnels, %d highsess, %d hightun size %d)\n", @@ -799,7 +842,7 @@ int type_changed(int type, int id) ++config->cluster_num_changes; if (config->cluster_num_changes > MAX_CHANGES) - cluster_heartbeat(config->cluster_highest_sessionid, fsess, config->cluster_highest_tunnelid); + cluster_heartbeat(); // flush now return 1; } @@ -854,8 +897,13 @@ int cluster_catchup_slave(int seq, u32 slave) while (seq != config->cluster_seq_number) { s = seq%HB_HISTORY_SIZE; if (seq != past_hearts[s].seq) { + int i; log(0,0,0,0, "Tried to re-send heartbeat for %s but %d doesn't match %d! (%d,%d)\n", inet_toa(slave), seq, past_hearts[s].seq, s, config->cluster_seq_number); + + for (i = 0; i < HB_HISTORY_SIZE; ++i) { + log(0,0,0,0, "\tentry %3d: seq %d (size %d)\n", i, past_hearts[s].seq, past_hearts[s].size); + } return -1; // What to do here!? } peer_send_data(slave, past_hearts[s].data, past_hearts[s].size); @@ -881,14 +929,6 @@ int cluster_add_peer(u32 peer, time_t basetime, pingt *p) return 0; } - // Is this the master shutting down?? - if (peer == config->cluster_master_address && !basetime) { - config->cluster_master_address = 0; - config->cluster_last_hb = 0; // Force an election. - cluster_check_master(); - return 0; - } - for (i = 0; i < num_peers ; ++i) { if (peers[i].peer != peer) @@ -897,9 +937,18 @@ int cluster_add_peer(u32 peer, time_t basetime, pingt *p) // This peer already exists. Just update the timestamp. peers[i].basetime = basetime; peers[i].timestamp = TIME; + peers[i].uptodate = !p->undef; break; } + // Is this the master shutting down?? + if (peer == config->cluster_master_address && !basetime) { + config->cluster_master_address = 0; + config->cluster_last_hb = 0; // Force an election. + cluster_check_master(); + return 0; + } + if (i >= num_peers) { log(4,0,0,0, "Adding %s as a peer\n", inet_toa(peer)); @@ -907,8 +956,9 @@ int cluster_add_peer(u32 peer, time_t basetime, pingt *p) // Not found. Is there a stale slot to re-use? for (i = 0; i < num_peers ; ++i) { - if (peers[i].peer != peer) - continue; + if (!peers[i].basetime) // Shutdown + break; + if ((peers[i].timestamp + config->cluster_hb_timeout * 10) < TIME) // Stale. break; } @@ -923,19 +973,27 @@ int cluster_add_peer(u32 peer, time_t basetime, pingt *p) peers[i].peer = peer; peers[i].basetime = basetime; peers[i].timestamp = TIME; + peers[i].uptodate = !p->undef; if (i == num_peers) ++num_peers; log(1,0,0,0, "Added %s as a new peer. Now %d peers\n", inet_toa(peer), num_peers); } + if (peers[i].uptodate) + { #ifdef BGP - /* drop routes if we've now got a peer */ - if (bgp_configured && config->cluster_iam_master && !have_peers) - bgp_enable_routing(0); + /* drop routes if we've now got a peer */ + if (config->cluster_iam_master && bgp_configured && !have_peers) + bgp_enable_routing(0); #endif /* BGP */ + have_peers = 1; + } + else if (config->cluster_iam_master) + { + config->cluster_iam_uptodate = 0; // increase heart-rate... + } - have_peers = 1; return 1; } @@ -1003,6 +1061,7 @@ static int cluster_recv_session(int more , u8 * p) if (!config->cluster_iam_uptodate) cluster_uptodate(); // Check to see if we're up to date. + return 0; } @@ -1040,23 +1099,28 @@ static int cluster_recv_tunnel(int more, u8 *p) // -// Process a version one heartbeat.. +// Process a heartbeat.. // -static int cluster_process_heartbeat_v2(u8 * data, int size, int more, u8 * p, u32 addr) +static int cluster_process_heartbeat(u8 * data, int size, int more, u8 * p, u32 addr) { heartt * h; int s = size - (p-data); int i, type; - if (more != HB_VERSION) { - log(0,0,0,0, "Received a heartbeat version that I don't understand!\n"); +#if HB_VERSION != 3 +# error "need to update cluster_process_heartbeat()" +#endif + + // we handle version 2+ + if (more < 2 || more > HB_VERSION) { + log(0,0,0,0, "Received a heartbeat version that I don't support (%d)!\n", more); return -1; // Ignore it?? } + // Ok. It's a heartbeat packet from a cluster master! if (s < sizeof(*h)) goto shortpacket; - h = (heartt*) p; p += sizeof(*h); s -= sizeof(*h); @@ -1114,6 +1178,25 @@ static int cluster_process_heartbeat_v2(u8 * data, int size, int more, u8 * p, u // that the free session pointer is correct. cluster_check_sessions(h->highsession, h->freesession, h->hightunnel); + if (more > 2) // reserved section of heartt was not initialized prior to v3 + { + if (h->interval != config->cluster_hb_interval) + { + log(2, 0, 0, 0, "Master set ping/heartbeat interval to %u (was %u)\n", + h->interval, config->cluster_hb_interval); + + config->cluster_hb_interval = h->interval; + } + + if (h->timeout != config->cluster_hb_timeout) + { + log(2, 0, 0, 0, "Master set heartbeat timeout to %u (was %u)\n", + h->timeout, config->cluster_hb_timeout); + + config->cluster_hb_timeout = h->timeout; + } + } + // Ok. process the packet... while ( s > 0) { @@ -1301,14 +1384,14 @@ int processcluster(char * data, int size, u32 addr) case C_HEARTBEAT: log(4,0,0,0, "Got a heartbeat from %s\n", inet_toa(addr)); - - return cluster_process_heartbeat_v2(data, size, more, p, addr); + return cluster_process_heartbeat(data, size, more, p, addr); default: log(0,0,0,0, "Strange type packet received on cluster socket (%d)\n", type); return -1; } return 0; + shortpacket: log(0,0,0,0, "I got an cluster heartbeat packet! This means I'm probably out of sync!!\n"); return -1;