X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/52e205c75ebe889d97195f078063e2fadd611a95..aa77d4f89aa291e851c9be8a64ecfdb1434e83c9:/cluster.c diff --git a/cluster.c b/cluster.c index a146e05..8f9c01e 100644 --- a/cluster.c +++ b/cluster.c @@ -1,8 +1,12 @@ // L2TPNS Clustering Stuff -char const *cvs_id_cluster = "$Id: cluster.c,v 1.6 2004/07/05 06:54:01 bodea Exp $"; +char const *cvs_id_cluster = "$Id: cluster.c,v 1.26.2.12 2005/07/03 02:58:06 bodea Exp $"; #include +#include +#include +#include +#include #include #include #include @@ -13,10 +17,6 @@ char const *cvs_id_cluster = "$Id: cluster.c,v 1.6 2004/07/05 06:54:01 bodea Exp #include #include #include -#include -#include -#include -#include #include #include "l2tpns.h" @@ -40,12 +40,10 @@ char const *cvs_id_cluster = "$Id: cluster.c,v 1.6 2004/07/05 06:54:01 bodea Exp // Module variables. int cluster_sockfd = 0; // The filedescriptor for the cluster communications port. -ipt my_address = 0; // The network address of my ethernet port. +in_addr_t 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! @@ -62,16 +60,15 @@ static struct { // we can re-transmit if needed. static struct { - u32 peer; - time_t basetime; - clockt timestamp; - int uptodate; + in_addr_t peer; + uint32_t basetime; + clockt timestamp; + 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 -int rle_decompress(u8 ** src_p, int ssize, u8 *dst, int dsize); -int rle_compress(u8 ** src_p, int ssize, u8 *dst, int dsize); +static int rle_decompress(uint8_t **src_p, int ssize, uint8_t *dst, int dsize); +static int rle_compress(uint8_t **src_p, int ssize, uint8_t *dst, int dsize); // // Create a listening socket @@ -80,65 +77,71 @@ int rle_compress(u8 ** src_p, int ssize, u8 *dst, int dsize); // int cluster_init() { - struct sockaddr_in addr; - struct sockaddr_in interface_addr; - struct ip_mreq mreq; - struct ifreq ifr; - int opt = 0; + struct sockaddr_in addr; + struct sockaddr_in interface_addr; + struct ip_mreq mreq; + struct ifreq ifr; + int opt; - config->cluster_undefined_sessions = MAXSESSION-1; - config->cluster_undefined_tunnels = MAXTUNNEL-1; + config->cluster_undefined_sessions = MAXSESSION-1; + config->cluster_undefined_tunnels = MAXTUNNEL-1; - if (!config->cluster_address) - return 0; - if (!*config->cluster_interface) - return 0; + if (!config->cluster_address) + return 0; + 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; - addr.sin_port = htons(CLUSTERPORT); - addr.sin_addr.s_addr = INADDR_ANY; - setsockopt(cluster_sockfd, SOL_SOCKET, SO_REUSEADDR, &addr, sizeof(addr)); + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = htons(CLUSTERPORT); + addr.sin_addr.s_addr = INADDR_ANY; + setsockopt(cluster_sockfd, SOL_SOCKET, SO_REUSEADDR, &addr, sizeof(addr)); - if (bind(cluster_sockfd, (void *) &addr, sizeof(addr)) < 0) - { - log(0, 0, 0, 0, "Failed to bind cluster socket: %s\n", strerror(errno)); - return -1; - } + opt = fcntl(cluster_sockfd, F_GETFL, 0); + fcntl(cluster_sockfd, F_SETFL, opt | O_NONBLOCK); - strcpy(ifr.ifr_name, config->cluster_interface); - if (ioctl(cluster_sockfd, SIOCGIFADDR, &ifr) < 0) { - log(0, 0, 0, 0, "Failed to get interface address for (%s): %s\n", config->cluster_interface, strerror(errno)); - return -1; - } + if (bind(cluster_sockfd, (void *) &addr, sizeof(addr)) < 0) + { + LOG(0, 0, 0, "Failed to bind cluster socket: %s\n", strerror(errno)); + return -1; + } - memcpy(&interface_addr, &ifr.ifr_addr, sizeof(interface_addr) ); - my_address = interface_addr.sin_addr.s_addr; + strcpy(ifr.ifr_name, config->cluster_interface); + if (ioctl(cluster_sockfd, SIOCGIFADDR, &ifr) < 0) + { + LOG(0, 0, 0, "Failed to get interface address for (%s): %s\n", config->cluster_interface, strerror(errno)); + return -1; + } - // Join multicast group. - mreq.imr_multiaddr.s_addr = config->cluster_address; - mreq.imr_interface = interface_addr.sin_addr; + memcpy(&interface_addr, &ifr.ifr_addr, sizeof(interface_addr)); + my_address = interface_addr.sin_addr.s_addr; + // Join multicast group. + mreq.imr_multiaddr.s_addr = config->cluster_address; + mreq.imr_interface = interface_addr.sin_addr; - opt = 0; // Turn off multicast loopback. - setsockopt(cluster_sockfd, IPPROTO_IP, IP_MULTICAST_LOOP, &opt, sizeof(opt)); - if (setsockopt(cluster_sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) { - log(0, 0, 0, 0, "Failed to setsockopt (join mcast group): %s\n", strerror(errno)); - return -1; - } + opt = 0; // Turn off multicast loopback. + setsockopt(cluster_sockfd, IPPROTO_IP, IP_MULTICAST_LOOP, &opt, sizeof(opt)); - if (setsockopt (cluster_sockfd, IPPROTO_IP, IP_MULTICAST_IF, &interface_addr, sizeof(interface_addr)) < 0) { - log(0, 0, 0, 0, "Failed to setsockopt (set mcast interface): %s\n", strerror(errno)); - return -1; - } + if (setsockopt(cluster_sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) + { + LOG(0, 0, 0, "Failed to setsockopt (join mcast group): %s\n", strerror(errno)); + return -1; + } + + if (setsockopt(cluster_sockfd, IPPROTO_IP, IP_MULTICAST_IF, &interface_addr, sizeof(interface_addr)) < 0) + { + LOG(0, 0, 0, "Failed to setsockopt (set mcast interface): %s\n", strerror(errno)); + return -1; + } - config->cluster_last_hb = TIME; - config->cluster_seq_number = -1; + config->cluster_last_hb = TIME; + config->cluster_seq_number = -1; - return cluster_sockfd; + return cluster_sockfd; } @@ -147,28 +150,26 @@ int cluster_init() // address ). // -int cluster_send_data(void *data, int datalen) +static int cluster_send_data(void *data, int datalen) { - struct sockaddr_in addr = {0}; - - if (!cluster_sockfd) return -1; - if (!config->cluster_address) return 0; + struct sockaddr_in addr = {0}; - addr.sin_addr.s_addr = config->cluster_address; - addr.sin_port = htons(CLUSTERPORT); - addr.sin_family = AF_INET; + if (!cluster_sockfd) return -1; + if (!config->cluster_address) return 0; -// log_hex(4, "Cluster send", data, datalen); // VERY big data packets. How about we don't.. + addr.sin_addr.s_addr = config->cluster_address; + addr.sin_port = htons(CLUSTERPORT); + addr.sin_family = AF_INET; - log(5,0,0,0, "Cluster send data: %d bytes\n", datalen); + LOG(5, 0, 0, "Cluster send data: %d bytes\n", datalen); - if (sendto(cluster_sockfd, data, datalen, MSG_NOSIGNAL, (void *) &addr, sizeof(addr)) < 0) - { - log(0, 0, 0, 0, "sendto: %s\n", strerror(errno)); - return -1; - } + if (sendto(cluster_sockfd, data, datalen, MSG_NOSIGNAL, (void *) &addr, sizeof(addr)) < 0) + { + LOG(0, 0, 0, "sendto: %s\n", strerror(errno)); + return -1; + } - return 0; + return 0; } // @@ -176,21 +177,42 @@ int cluster_send_data(void *data, int datalen) // Maintains the format. Assumes that the caller // has passed in a big enough buffer! // -static void add_type(char ** p, int type, int more, char * data, int size) +static void add_type(char **p, int type, int more, char *data, int size) { - * ( (u32*)(*p) ) = type; - *p += sizeof(u32); + *((uint32_t *) (*p)) = type; + *p += sizeof(uint32_t); - * ( (u32*)(*p) ) = more; - *p += sizeof(u32); + *((uint32_t *)(*p)) = more; + *p += sizeof(uint32_t); if (data && size > 0) { memcpy(*p, data, size); - (*p) += size; + *p += size; } } -void cluster_uptodate(void) +// advertise our presence via BGP or gratuitous ARP +static void advertise_routes(void) +{ +#ifdef BGP + if (bgp_configured) + bgp_enable_routing(1); + else +#endif /* BGP */ + if (config->send_garp) + 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) return; @@ -200,60 +222,48 @@ void cluster_uptodate(void) config->cluster_iam_uptodate = 1; - 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 -#endif /* BGP */ - if (config->send_garp) - send_garp(config->bind_address); // Start taking traffic. - } + LOG(0, 0, 0, "Now uptodate with master.\n"); + advertise_routes(); } // // Send a unicast UDP packet to a peer with 'data' as the // contents. // -int peer_send_data(u32 peer, char * data, int size) +static int peer_send_data(in_addr_t peer, char *data, int size) { - struct sockaddr_in addr = {0}; + struct sockaddr_in addr = {0}; - if (!cluster_sockfd) return -1; - if (!config->cluster_address) return 0; + if (!cluster_sockfd) return -1; + if (!config->cluster_address) return 0; - if (!peer) // Odd?? - return -1; + if (!peer) // Odd?? + return -1; - addr.sin_addr.s_addr = peer; - addr.sin_port = htons(CLUSTERPORT); - addr.sin_family = AF_INET; + addr.sin_addr.s_addr = peer; + addr.sin_port = htons(CLUSTERPORT); + addr.sin_family = AF_INET; - log_hex(5, "Peer send", data, size); + LOG_HEX(5, "Peer send", data, size); - if (sendto(cluster_sockfd, data, size, MSG_NOSIGNAL, (void *) &addr, sizeof(addr)) < 0) - { - log(0, 0, 0, 0, "sendto: %s\n", strerror(errno)); - return -1; - } + if (sendto(cluster_sockfd, data, size, MSG_NOSIGNAL, (void *) &addr, sizeof(addr)) < 0) + { + LOG(0, 0, 0, "sendto: %s\n", strerror(errno)); + return -1; + } - return 0; + return 0; } // // Send a structured message to a peer with a single element of type 'type'. // -int peer_send_message(u32 peer, int type, int more, char * data, int size) +static int peer_send_message(in_addr_t peer, int type, int more, char *data, int size) { char buf[65536]; // Vast overkill. - char * p = buf; + char *p = buf; - log(4,0,0,0, "Sending message to peer (type %d, more %d, size %d)\n", type, more, size); + LOG(4, 0, 0, "Sending message to peer (type %d, more %d, size %d)\n", type, more, size); add_type(&p, type, more, data, size); return peer_send_data(peer, buf, (p-buf) ); @@ -263,25 +273,24 @@ int peer_send_message(u32 peer, int type, int more, char * data, int size) // Forward a state changing packet to the master. // // The master just processes the payload as if it had -// received it off the tap device. +// received it off the tun device. // -int master_forward_packet(char * data, int size, u32 addr, int port) +int master_forward_packet(char *data, int size, in_addr_t addr, int port) { char buf[65536]; // Vast overkill. - char * p = buf; + char *p = buf; if (!config->cluster_master_address) // No election has been held yet. Just skip it. return -1; - log(4,0,0,0, "Forwarding packet from %s to master (size %d)\n", inet_toa(addr), size); + LOG(4, 0, 0, "Forwarding packet from %s to master (size %d)\n", fmtaddr(addr, 0), size); STAT(c_forwarded); - add_type(&p, C_FORWARD, addr, (char*) &port, sizeof(port) ); + add_type(&p, C_FORWARD, addr, (char *) &port, sizeof(port)); memcpy(p, data, size); p += size; - return peer_send_data(config->cluster_master_address, buf, (p-buf) ); - + return peer_send_data(config->cluster_master_address, buf, (p - buf)); } // @@ -291,15 +300,15 @@ int master_forward_packet(char * data, int size, u32 addr, int port) // token bucket queue, and lets normal processing take care // of it. // -int master_throttle_packet(int tbfid, char * data, int size) +int master_throttle_packet(int tbfid, char *data, int size) { char buf[65536]; // Vast overkill. - char * p = buf; + char *p = buf; if (!config->cluster_master_address) // No election has been held yet. Just skip it. return -1; - log(4,0,0,0, "Throttling packet master (size %d, tbfid %d)\n", size, tbfid); + LOG(4, 0, 0, "Throttling packet master (size %d, tbfid %d)\n", size, tbfid); add_type(&p, C_THROTTLE, tbfid, data, size); @@ -324,7 +333,7 @@ int master_garden_packet(sessionidt s, char *data, int size) if (!config->cluster_master_address) // No election has been held yet. Just skip it. return -1; - log(4,0,0,0, "Walled garden packet to master (size %d)\n", size); + LOG(4, 0, 0, "Walled garden packet to master (size %d)\n", size); add_type(&p, C_GARDEN, s, data, size); @@ -336,20 +345,21 @@ int master_garden_packet(sessionidt s, char *data, int size) // Send a chunk of data as a heartbeat.. // We save it in the history buffer as we do so. // -static void send_heartbeat(int seq, char * data, int size) +static void send_heartbeat(int seq, char *data, int size) { - int i; - - if (size > sizeof(past_hearts[0].data)) { - log(0,0,0,0, "Tried to heartbeat something larger than the maximum packet!\n"); - kill(0, SIGTERM); - exit(1); - } - i = seq % HB_HISTORY_SIZE; - past_hearts[i].seq = seq; - past_hearts[i].size = size; - memcpy(&past_hearts[i].data, data, size); // Save it. - cluster_send_data(data, size); + int i; + + if (size > sizeof(past_hearts[0].data)) + { + LOG(0, 0, 0, "Tried to heartbeat something larger than the maximum packet!\n"); + kill(0, SIGTERM); + exit(1); + } + i = seq % HB_HISTORY_SIZE; + past_hearts[i].seq = seq; + past_hearts[i].size = size; + memcpy(&past_hearts[i].data, data, size); // Save it. + cluster_send_data(data, size); } // @@ -364,7 +374,7 @@ void cluster_send_ping(time_t basetime) if (config->cluster_iam_master && basetime) // We're heartbeating so no need to ping. return; - log(5,0,0,0, "Sending cluster ping...\n"); + LOG(5, 0, 0, "Sending cluster ping...\n"); x.ver = 1; x.addr = config->bind_address; @@ -377,12 +387,12 @@ void cluster_send_ping(time_t basetime) // // Walk the session counters looking for non-zero ones to send -// to the master. We send up to 100 of them at one time. -// We examine a maximum of 2000 sessions. +// to the master. We send up to 600 of them at one time. +// We examine a maximum of 3000 sessions. // (50k max session should mean that we normally // examine the entire session table every 25 seconds). -#define MAX_B_RECS (400) +#define MAX_B_RECS (600) void master_update_counts(void) { int i, c; @@ -404,18 +414,18 @@ void master_update_counts(void) if ( walk_session_number > config->cluster_highest_sessionid) walk_session_number = 1; - if (!sess_count[walk_session_number].cin && !sess_count[walk_session_number].cout) + if (!sess_local[walk_session_number].cin && !sess_local[walk_session_number].cout) continue; // Unused. Skip it. b[c].sid = walk_session_number; - b[c].in = sess_count[walk_session_number].cin; - b[c].out = sess_count[walk_session_number].cout; + b[c].in = sess_local[walk_session_number].cin; + b[c].out = sess_local[walk_session_number].cout; if (++c > MAX_B_RECS) // Send a max of 400 elements in a packet. break; // Reset counters. - sess_count[walk_session_number].cin = sess_count[walk_session_number].cout = 0; + sess_local[walk_session_number].cin = sess_local[walk_session_number].cout = 0; } if (!c) // Didn't find any that changes. Get out of here! @@ -423,72 +433,125 @@ void master_update_counts(void) // Forward the data to the master. - log(4,0,0,0, "Sending byte counters to master (%d elements)\n", c); - peer_send_message(config->cluster_master_address, C_BYTES, c, (char*) &b, sizeof(b[0]) * c); + LOG(4, 0, 0, "Sending byte counters to master (%d elements)\n", c); + peer_send_message(config->cluster_master_address, C_BYTES, c, (char *) &b, sizeof(b[0]) * c); return; } +// +// On the master, check how our slaves are going. If +// one of them's not up-to-date we'll heartbeat faster. +// If we don't have any of them, then we need to turn +// on our own packet handling! +// +void cluster_check_slaves(void) +{ + int i; + static int have_peers = 0; + int had_peers = have_peers; + clockt t = TIME; + + if (!config->cluster_iam_master) + return; // Only runs on the master... + + config->cluster_iam_uptodate = 1; // cleared in loop below + + 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. + + if (peers[i].uptodate) + have_peers++; + else + config->cluster_iam_uptodate = 0; // Start fast heartbeats + } + + // 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(); + } +} + // // Check that we have a master. If it's been too // long since we heard from a master then hold an election. // void cluster_check_master(void) { - int i, count, tcount, high_sid = 0; + int i, count, tcount, high_unique_id = 0; int last_free = 0; - int had_peers = have_peers; 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 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 (config->cluster_master_address + && TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11)) + { + if (!probed || (TIME > (probed + 2 * config->cluster_hb_interval))) + { + probed = TIME; + LOG(1, 0, 0, "Heartbeat from master %.1fs late, probing...\n", + 0.1 * (TIME - (config->cluster_last_hb + config->cluster_hb_interval))); - // Is the master late? If so, try probing it... - if (TIME > (config->cluster_last_hb + config->cluster_hb_timeout/8 + 11)) { - if (!probed) { - if (config->cluster_master_address) { - peer_send_message(config->cluster_master_address, - C_LASTSEEN, config->cluster_seq_number, NULL, 0); - probed = 1; - } + 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 (TIME < (config->cluster_last_hb + config->cluster_hb_timeout)) + return; // Everything's ok! - if (!config->cluster_iam_master) - log(0,0,0,0, "Master timed out! Holding election...\n"); + config->cluster_last_hb = TIME + 1; // Just the one election thanks. + config->cluster_master_address = 0; - config->cluster_last_hb = TIME + 1; + LOG(0, 0, 0, "Master timed out! Holding election...\n"); - for (i = have_peers = 0; i < num_peers ; ++i) { + // In the process of shutting down, can't be master + if (main_quit) + return; + + 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].basetime < basetime) { - log(1,0,0,0, "Expecting %s to become master\n", inet_toa(peers[i].peer) ); + LOG(1, 0, 0, "Expecting %s to become master\n", fmtaddr(peers[i].peer, 0)); return; // They'll win the election. Get out of here. } if (peers[i].basetime == basetime && peers[i].peer > my_address) { - log(1,0,0,0, "Expecting %s to become master\n", inet_toa(peers[i].peer) ); + 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 (config->cluster_iam_master) // If we're the master, we've already won - { -#ifdef BGP - // master lost all slaves, need to handle traffic ourself - if (bgp_configured && had_peers && !have_peers) - bgp_enable_routing(1); -#endif /* BGP */ - return; + if (peers[i].uptodate) + have_peers++; } // Wow. it's been ages since I last heard a heartbeat @@ -496,14 +559,13 @@ void cluster_check_master(void) // to become a master!!! config->cluster_iam_master = 1; - config->cluster_master_address = 0; - log(0,0,0,0, "I am declaring myself the master!\n"); + LOG(0, 0, 0, "I am declaring myself the master!\n"); -#ifdef BGP - if (bgp_configured && have_peers) - bgp_enable_routing(0); /* stop handling traffic */ -#endif /* BGP */ + if (have_peers < config->cluster_master_min_adv) + advertise_routes(); + else + withdraw_routes(); if (config->cluster_seq_number == -1) config->cluster_seq_number = 0; @@ -528,7 +590,7 @@ void cluster_check_master(void) // Re-string the free list. // Find the ID of the highest session. last_free = 0; - high_sid = 0; + high_unique_id = 0; config->cluster_highest_sessionid = 0; for (i = 0, count = 0; i < MAXSESSION; ++i) { if (session[i].tunnel == T_UNDEF) { @@ -536,45 +598,42 @@ void cluster_check_master(void) ++count; } - if (session[i].tunnel == T_FREE) { // Unused session. Add to free list. + if (!session[i].opened) { // Unused session. Add to free list. + memset(&session[i], 0, sizeof(session[i])); + session[i].tunnel = T_FREE; session[last_free].next = i; session[i].next = 0; last_free = i; + continue; } - // Reset all the idle timeouts.. + // Reset idle timeouts.. session[i].last_packet = time_now; + // Reset die relative to our uptime rather than the old master's + if (session[i].die) session[i].die = TIME; + // Accumulate un-sent byte counters. - session[i].cin += sess_count[i].cin; - session[i].cout += sess_count[i].cout; - session[i].total_cin += sess_count[i].cin; - session[i].total_cout += sess_count[i].cout; + session[i].cin += sess_local[i].cin; + session[i].cout += sess_local[i].cout; + session[i].total_cin += sess_local[i].cin; + session[i].total_cout += sess_local[i].cout; - sess_count[i].cin = sess_count[i].cout = 0; + sess_local[i].cin = sess_local[i].cout = 0; session[i].radius = 0; // Reset authentication as the radius blocks aren't up to date. - if (session[i].sid >= high_sid) // This is different to the index into the session table!!! - high_sid = session[i].sid+1; - + 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; session[i].tbf_in = session[i].tbf_out = 0; // Remove stale pointers from old master. - throttle_session(i, session[i].throttle); - -// I'm unsure about this. --mo -// It's potentially a good thing, but it could send a -// LOT of packets. -// if (session[i].throttle) -// cluster_send_session(s); // Tell the slaves about the new tbf indexes. - - if (session[i].tunnel != T_FREE && i > config->cluster_highest_sessionid) - config->cluster_highest_sessionid = i; + throttle_session(i, session[i].throttle_in, session[i].throttle_out); + config->cluster_highest_sessionid = i; } session[last_free].next = 0; // End of chain. - last_sid = high_sid; // Keep track of the highest used session ID. + last_id = high_unique_id; // Keep track of the highest used session ID. become_master(); @@ -582,16 +641,15 @@ void cluster_check_master(void) // If we're not the very first master, this is a big issue! if(count>0) - log(0,0,0,0, "Warning: Fixed %d uninitialized sessions in becoming master!\n", count); + LOG(0, 0, 0, "Warning: Fixed %d uninitialized sessions in becoming master!\n", count); 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. } @@ -620,12 +678,12 @@ static void cluster_check_sessions(int highsession, int freesession_ptr, int hig config->cluster_undefined_sessions = 0; for (i = 1 ; i < MAXSESSION; ++i) { if (i > highsession) { - session[i].tunnel = 0; // Defined. + if (session[i].tunnel == T_UNDEF) session[i].tunnel = T_FREE; // Defined. continue; } - if (session[i].tunnel != T_UNDEF) - continue; - ++config->cluster_undefined_sessions; + + if (session[i].tunnel == T_UNDEF) + ++config->cluster_undefined_sessions; } // Clear out defined tunnels, counting the number of @@ -633,17 +691,17 @@ static void cluster_check_sessions(int highsession, int freesession_ptr, int hig config->cluster_undefined_tunnels = 0; for (i = 1 ; i < MAXTUNNEL; ++i) { if (i > hightunnel) { - tunnel[i].state = TUNNELFREE; // Defined. + if (tunnel[i].state == TUNNELUNDEF) tunnel[i].state = TUNNELFREE; // Defined. continue; } - if (tunnel[i].state != TUNNELUNDEF) - continue; - ++config->cluster_undefined_tunnels; + + if (tunnel[i].state == TUNNELUNDEF) + ++config->cluster_undefined_tunnels; } if (config->cluster_undefined_sessions || config->cluster_undefined_tunnels) { - log(2,0,0,0, "Cleared undefined sessions/tunnels. %d sess (high %d), %d tunn (high %d)\n", + LOG(2, 0, 0, "Cleared undefined sessions/tunnels. %d sess (high %d), %d tunn (high %d)\n", config->cluster_undefined_sessions, highsession, config->cluster_undefined_tunnels, hightunnel); return; } @@ -654,13 +712,13 @@ static void cluster_check_sessions(int highsession, int freesession_ptr, int hig cluster_uptodate(); } -int hb_add_type(char **p, int type, int id) +static int hb_add_type(char **p, int type, int id) { switch (type) { case C_CSESSION: { // Compressed C_SESSION. - u8 c[sizeof(sessiont) * 2]; // Bigger than worst case. - u8 *d = (u8 *) &session[id]; - u8 *orig = d; + uint8_t c[sizeof(sessiont) * 2]; // Bigger than worst case. + uint8_t *d = (uint8_t *) &session[id]; + uint8_t *orig = d; int size; size = rle_compress( &d, sizeof(sessiont), c, sizeof(c) ); @@ -668,19 +726,19 @@ int hb_add_type(char **p, int type, int id) // Did we compress the full structure, and is the size actually // reduced?? if ( (d - orig) == sizeof(sessiont) && size < sizeof(sessiont) ) { - add_type(p, C_CSESSION, id, (char*) c, size); + add_type(p, C_CSESSION, id, (char *) c, size); break; } // Failed to compress : Fall through. } case C_SESSION: add_type(p, C_SESSION, id, - (char*) &session[id], sizeof(sessiont)); + (char *) &session[id], sizeof(sessiont)); break; case C_CTUNNEL: { // Compressed C_TUNNEL - u8 c[sizeof(tunnelt) * 2]; // Bigger than worst case. - u8 *d = (u8 *) &tunnel[id]; - u8 *orig = d; + uint8_t c[sizeof(tunnelt) * 2]; // Bigger than worst case. + uint8_t *d = (uint8_t *) &tunnel[id]; + uint8_t *orig = d; int size; size = rle_compress( &d, sizeof(tunnelt), c, sizeof(c) ); @@ -694,11 +752,12 @@ int hb_add_type(char **p, int type, int id) // Failed to compress : Fall through. } case C_TUNNEL: add_type(p, C_TUNNEL, id, - (char*) &tunnel[id], sizeof(tunnelt)); + (char *) &tunnel[id], sizeof(tunnelt)); break; default: - log(0,0,0,0, "Found an invalid type in heart queue! (%d)\n", type); + LOG(0, 0, 0, "Found an invalid type in heart queue! (%d)\n", type); kill(0, SIGTERM); + exit(1); } return 0; } @@ -706,54 +765,60 @@ 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. + config->cluster_table_version += config->cluster_num_changes; + + // 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; + h.table_version = config->cluster_table_version; - 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); } 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); + LOG(0, 0, 0, "FATAL: Overran the heartbeat buffer! This is fatal. Exiting. (size %d)\n", (int) (p - buff)); kill(0, SIGTERM); + exit(1); } // // Fill out the packet with sessions from the session table... // (not forgetting to leave space so we can get some tunnels in too ) - while ( (p + sizeof(u32) * 2 + sizeof(sessiont) * 2 ) < (buff + MAX_HEART_SIZE) ) { + while ( (p + sizeof(uint32_t) * 2 + sizeof(sessiont) * 2 ) < (buff + MAX_HEART_SIZE) ) { 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. } @@ -764,7 +829,7 @@ void cluster_heartbeat(int highsession, int freesession, int hightunnel) // than the session table. This is good because stuffing up a // tunnel is a much bigger deal than stuffing up a session. // - while ( (p + sizeof(u32) * 2 + sizeof(tunnelt) ) < (buff + MAX_HEART_SIZE) ) { + while ( (p + sizeof(uint32_t) * 2 + sizeof(tunnelt) ) < (buff + MAX_HEART_SIZE) ) { if (!walk_tunnel_number) // tunnel #0 isn't valid. ++walk_tunnel_number; @@ -781,13 +846,16 @@ void cluster_heartbeat(int highsession, int freesession, int hightunnel) // // Did we do something wrong? 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); + LOG(0, 0, 0, "Overran the heartbeat buffer now! This is fatal. Exiting. (size %d)\n", (int) (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", - h.seq, config->cluster_num_changes, count, tcount, config->cluster_highest_sessionid, - config->cluster_highest_tunnelid, (p-buff)); + LOG(3, 0, 0, "Sending v%d heartbeat #%d, change #%" PRIu64 " with %d changes " + "(%d x-sess, %d x-tunnels, %d highsess, %d hightun, size %d)\n", + HB_VERSION, h.seq, h.table_version, config->cluster_num_changes, + count, tcount, config->cluster_highest_sessionid, + config->cluster_highest_tunnelid, (int) (p - buff)); config->cluster_num_changes = 0; @@ -799,7 +867,7 @@ void cluster_heartbeat(int highsession, int freesession, int hightunnel) // // A structure of type 'type' has changed; Add it to the queue to send. // -int type_changed(int type, int id) +static int type_changed(int type, int id) { int i; @@ -813,7 +881,7 @@ 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; } @@ -823,7 +891,7 @@ int type_changed(int type, int id) int cluster_send_session(int sid) { if (!config->cluster_iam_master) { - log(0,0,sid,0, "I'm not a master, but I just tried to change a session!\n"); + LOG(0, sid, 0, "I'm not a master, but I just tried to change a session!\n"); return -1; } @@ -834,7 +902,7 @@ int cluster_send_session(int sid) int cluster_send_tunnel(int tid) { if (!config->cluster_iam_master) { - log(0,0,0,tid, "I'm not a master, but I just tried to change a tunnel!\n"); + LOG(0, 0, tid, "I'm not a master, but I just tried to change a tunnel!\n"); return -1; } @@ -847,29 +915,38 @@ int cluster_send_tunnel(int tid) // missed a packet. We'll resend it every packet since // the last one it's seen. // -int cluster_catchup_slave(int seq, u32 slave) +static int cluster_catchup_slave(int seq, in_addr_t slave) { int s; int diff; - log(1,0,0,0, "Slave %s sent LASTSEEN with seq %d\n", inet_toa(slave), seq); + 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) diff += HB_MAX_SEQ; if (diff >= HB_HISTORY_SIZE) { // Ouch. We don't have the packet to send it! - log(0,0,0,0, "A slaved asked for message %d when our seq number is %d. Killing it.\n", + LOG(0, 0, 0, "A slave asked for message %d when our seq number is %d. Killing it.\n", seq, config->cluster_seq_number); 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(0,0,0,0, "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); + 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); return -1; // What to do here!? } peer_send_data(slave, past_hearts[s].data, past_hearts[s].size); @@ -882,24 +959,27 @@ int cluster_catchup_slave(int seq, u32 slave) // We've heard from another peer! Add it to the list // that we select from at election time. // -int cluster_add_peer(u32 peer, time_t basetime, pingt *p) +static int cluster_add_peer(in_addr_t peer, time_t basetime, pingt *pp, int size) { int i; - u32 clusterid; + in_addr_t clusterid; + pingt p; + + // Allow for backward compatability. + // Just the ping packet into a new structure to allow + // for the possibility that we might have received + // more or fewer elements than we were expecting. + if (size > sizeof(p)) + size = sizeof(p); + + memset( (void *) &p, 0, sizeof(p) ); + memcpy( (void *) &p, (void *) pp, size); - clusterid = p->addr; + clusterid = p.addr; if (clusterid != config->bind_address) { // Is this for us? - log(4,0,0,0, "Skipping ping from %s (different cluster)\n", inet_toa(peer)); - 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(); + LOG(4, 0, 0, "Skipping ping from %s (different cluster)\n", fmtaddr(peer, 0)); return 0; } @@ -911,18 +991,31 @@ 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) { + 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(); + return 0; + } + if (i >= num_peers) { - log(4,0,0,0, "Adding %s as a peer\n", inet_toa(peer)); + LOG(4, 0, 0, "Adding %s as a peer\n", fmtaddr(peer, 0)); // 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; } @@ -930,28 +1023,35 @@ int cluster_add_peer(u32 peer, time_t basetime, pingt *p) if (i >= CLUSTER_MAX_SIZE) { // Too many peers!! - log(0,0,0,0, "Tried to add %s as a peer, but I already have %d of them!\n", inet_toa(peer), i); + LOG(0, 0, 0, "Tried to add %s as a peer, but I already have %d of them!\n", fmtaddr(peer, 0), i); return -1; } 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); + LOG(1, 0, 0, "Added %s as a new peer. Now %d peers\n", fmtaddr(peer, 0), num_peers); } -#ifdef BGP - /* drop routes if we've now got a peer */ - if (bgp_configured && config->cluster_iam_master && !have_peers) - bgp_enable_routing(0); -#endif /* BGP */ + return 1; +} - have_peers = 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; - return 1; + 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. */ @@ -959,20 +1059,20 @@ int cluster_add_peer(u32 peer, time_t basetime, pingt *p) // Note that we don't mark the session as dirty; We rely on // the slow table walk to propogate this back out to the slaves. // -int cluster_handle_bytes(char * data, int size) +static int cluster_handle_bytes(char *data, int size) { - bytest * b; + bytest *b; - b = (bytest*) data; + b = (bytest *) data; - log(3,0,0,0, "Got byte counter update (size %d)\n", size); + LOG(3, 0, 0, "Got byte counter update (size %d)\n", size); /* Loop around, adding the byte counts to each of the sessions. */ while (size >= sizeof(*b) ) { if (b->sid > MAXSESSION) { - log(0,0,0,0, "Got C_BYTES with session #%d!\n", b->sid); + LOG(0, 0, 0, "Got C_BYTES with session #%d!\n", b->sid); return -1; /* Abort processing */ } @@ -981,14 +1081,16 @@ int cluster_handle_bytes(char * data, int size) session[b->sid].cin += b->in; session[b->sid].cout += b->out; - session[b->sid].last_packet = time_now; // Reset idle timer! + + if (b->in) + session[b->sid].last_packet = time_now; // Reset idle timer! size -= sizeof(*b); ++b; } if (size != 0) - log(0,0,0,0, "Got C_BYTES with %d bytes of trailing junk!\n", size); + LOG(0, 0, 0, "Got C_BYTES with %d bytes of trailing junk!\n", size); return size; } @@ -996,40 +1098,41 @@ int cluster_handle_bytes(char * data, int size) // // Handle receiving a session structure in a heartbeat packet. // -static int cluster_recv_session(int more , u8 * p) +static int cluster_recv_session(int more, uint8_t *p) { if (more >= MAXSESSION) { - log(0,0,0,0, "DANGER: Received a heartbeat session id > MAXSESSION!\n"); + LOG(0, 0, 0, "DANGER: Received a heartbeat session id > MAXSESSION!\n"); return -1; } if (session[more].tunnel == T_UNDEF) { if (config->cluster_iam_uptodate) { // Sanity. - log(0,0,0,0, "I thought I was uptodate but I just found an undefined session!\n"); + LOG(0, 0, 0, "I thought I was uptodate but I just found an undefined session!\n"); } else { --config->cluster_undefined_sessions; } } - load_session(more, (sessiont*) p); // Copy session into session table.. + load_session(more, (sessiont *) p); // Copy session into session table.. - log(5,0,more,0, "Received session update (%d undef)\n", config->cluster_undefined_sessions); + LOG(5, more, 0, "Received session update (%d undef)\n", config->cluster_undefined_sessions); if (!config->cluster_iam_uptodate) cluster_uptodate(); // Check to see if we're up to date. + return 0; } -static int cluster_recv_tunnel(int more, u8 *p) +static int cluster_recv_tunnel(int more, uint8_t *p) { if (more >= MAXTUNNEL) { - log(0,0,0,0, "DANGER: Received a tunnel session id > MAXTUNNEL!\n"); + LOG(0, 0, 0, "DANGER: Received a tunnel session id > MAXTUNNEL!\n"); return -1; } if (tunnel[more].state == TUNNELUNDEF) { if (config->cluster_iam_uptodate) { // Sanity. - log(0,0,0,0, "I thought I was uptodate but I just found an undefined tunnel!\n"); + LOG(0, 0, 0, "I thought I was uptodate but I just found an undefined tunnel!\n"); } else { --config->cluster_undefined_tunnels; } @@ -1044,7 +1147,7 @@ static int cluster_recv_tunnel(int more, u8 *p) tunnel[more].controls = tunnel[more].controle = NULL; tunnel[more].controlc = 0; - log(5,0,0,more, "Received tunnel update\n"); + LOG(5, 0, more, "Received tunnel update\n"); if (!config->cluster_iam_uptodate) cluster_uptodate(); // Check to see if we're up to date. @@ -1054,24 +1157,31 @@ 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) +// v3: added interval, timeout +// v4: added table_version +static int cluster_process_heartbeat(uint8_t *data, int size, int more, uint8_t *p, in_addr_t addr) { - heartt * h; + 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 != 4 +# 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); return -1; // Ignore it?? } + // Ok. It's a heartbeat packet from a cluster master! if (s < sizeof(*h)) goto shortpacket; - - h = (heartt*) p; + h = (heartt *) p; p += sizeof(*h); s -= sizeof(*h); @@ -1081,33 +1191,87 @@ static int cluster_process_heartbeat_v2(u8 * data, int size, int more, u8 * p, u if (config->cluster_iam_master) { // Sanity... // Note that this MUST match the election process above! - log(0,0,0,0, "I just got a packet claiming to be from a master but _I_ am the master!\n"); + LOG(0, 0, 0, "I just got a heartbeat from master %s, but _I_ am the master!\n", fmtaddr(addr, 0)); if (!h->basetime) { - log(0,0,0,0, "Heartbeat from addr %s with zero basetime!\n", inet_toa(addr) ); + LOG(0, 0, 0, "Heartbeat with zero basetime! Ignoring\n"); return -1; // Skip it. } + + if (more >= 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); + + kill(0, SIGTERM); + exit(1); + } + if (h->table_version < config->cluster_table_version) + return -1; + } + if (basetime > h->basetime) { - log(0,0,0,0, "They're (%s) an older master than me so I'm gone!\n", inet_toa(addr)); + LOG(0, 0, 0, "They're an older master than me so I'm gone!\n"); kill(0, SIGTERM); exit(1); } - if (basetime == h->basetime && my_address < addr) { // Tie breaker. - log(0,0,0,0, "They're a higher IP address than me, so I'm gone!\n"); + + if (basetime < h->basetime) + return -1; + + if (my_address < addr) { // Tie breaker. + LOG(0, 0, 0, "They're a higher IP address than me, so I'm gone!\n"); kill(0, SIGTERM); 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) { + 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; config->cluster_last_hb = TIME; // Reset to ensure that we don't become master!! if (config->cluster_seq_number != h->seq) { // Out of sequence heartbeat! - log(1,0,0,0, "HB: Got seq# %d but was expecting %d. asking for resend.\n", h->seq, config->cluster_seq_number); + static int lastseen_seq = 0; + static time_t lastseen_time = 0; + + // limit to once per second for a particular seq# + int ask = (config->cluster_seq_number != lastseen_seq || time_now != lastseen_time); - peer_send_message(addr, C_LASTSEEN, config->cluster_seq_number, NULL, 0); + LOG(1, 0, 0, "HB: Got seq# %d but was expecting %d. %s.\n", + h->seq, config->cluster_seq_number, + ask ? "Asking for resend" : "Ignoring"); + + if (ask) + { + lastseen_seq = config->cluster_seq_number; + lastseen_time = time_now; + peer_send_message(addr, C_LASTSEEN, config->cluster_seq_number, NULL, 0); + } config->cluster_last_hb = TIME; // Reset to ensure that we don't become master!! @@ -1128,28 +1292,44 @@ 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 (h->interval != config->cluster_hb_interval) + { + LOG(2, 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, "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) { - type = * ((u32*) p); - p += sizeof(u32); - s -= sizeof(u32); + type = *((uint32_t *) p); + p += sizeof(uint32_t); + s -= sizeof(uint32_t); - more = * ((u32*) p); - p += sizeof(u32); - s -= sizeof(u32); + more = *((uint32_t *) p); + p += sizeof(uint32_t); + s -= sizeof(uint32_t); switch (type) { case C_CSESSION: { // Compressed session structure. - u8 c [ sizeof(sessiont) + 2]; + uint8_t c[ sizeof(sessiont) + 2]; int size; - u8 * orig_p = p; + uint8_t *orig_p = p; - size = rle_decompress((u8 **) &p, s, c, sizeof(c) ); + size = rle_decompress((uint8_t **) &p, s, c, sizeof(c) ); s -= (p - orig_p); if (size != sizeof(sessiont) ) { // Ouch! Very very bad! - log(0,0,0,0, "DANGER: Received a CSESSION that didn't decompress correctly!\n"); + LOG(0, 0, 0, "DANGER: Received a CSESSION that didn't decompress correctly!\n"); // Now what? Should exit! No-longer up to date! break; } @@ -1168,15 +1348,15 @@ static int cluster_process_heartbeat_v2(u8 * data, int size, int more, u8 * p, u break; case C_CTUNNEL: { // Compressed tunnel structure. - u8 c [ sizeof(tunnelt) + 2]; + uint8_t c[ sizeof(tunnelt) + 2]; int size; - u8 * orig_p = p; + uint8_t *orig_p = p; - size = rle_decompress( (u8 **) &p, s, c, sizeof(c) ); + size = rle_decompress((uint8_t **) &p, s, c, sizeof(c)); s -= (p - orig_p); if (size != sizeof(tunnelt) ) { // Ouch! Very very bad! - log(0,0,0,0, "DANGER: Received a CSESSION that didn't decompress correctly!\n"); + LOG(0, 0, 0, "DANGER: Received a CSESSION that didn't decompress correctly!\n"); // Now what? Should exit! No-longer up to date! break; } @@ -1195,24 +1375,25 @@ static int cluster_process_heartbeat_v2(u8 * data, int size, int more, u8 * p, u s -= sizeof(tunnel[more]); break; default: - log(0,0,0,0, "DANGER: I received a heartbeat element where I didn't understand the type! (%d)\n", type); + LOG(0, 0, 0, "DANGER: I received a heartbeat element where I didn't understand the type! (%d)\n", type); return -1; // can't process any more of the packet!! } } + if (config->cluster_master_address != addr) { - char *str; - str = strdup(inet_toa(config->cluster_master_address)); - log(0,0,0,0, "My master just changed from %s to %s!\n", str, inet_toa(addr)); - if (str) free(str); + LOG(0, 0, 0, "My master just changed from %s to %s!\n", + fmtaddr(config->cluster_master_address, 0), fmtaddr(addr, 1)); + + config->cluster_master_address = addr; } - config->cluster_master_address = addr; config->cluster_last_hb = TIME; // Successfully received a heartbeat! + config->cluster_table_version = h->table_version; return 0; shortpacket: - log(0,0,0,0, "I got an incomplete heartbeat packet! This means I'm probably out of sync!!\n"); + LOG(0, 0, 0, "I got an incomplete heartbeat packet! This means I'm probably out of sync!!\n"); return -1; } @@ -1220,16 +1401,16 @@ shortpacket: // We got a packet on the cluster port! // Handle pings, lastseens, and heartbeats! // -int processcluster(char * data, int size, u32 addr) +int processcluster(char *data, int size, in_addr_t addr) { int type, more; - char * p = data; + char *p = data; int s = size; if (addr == my_address) return -1; // Ignore it. Something looped back the multicast! - log(5,0,0,0, "Process cluster: %d bytes from %s\n", size, inet_toa(addr)); + LOG(5, 0, 0, "Process cluster: %d bytes from %s\n", size, fmtaddr(addr, 0)); if (s <= 0) // Any data there?? return -1; @@ -1237,42 +1418,45 @@ int processcluster(char * data, int size, u32 addr) if (s < 8) goto shortpacket; - type = * ((u32*) p); - p += sizeof(u32); - s -= sizeof(u32); + type = *((uint32_t *) p); + p += sizeof(uint32_t); + s -= sizeof(uint32_t); - more = * ((u32*) p); - p += sizeof(u32); - s -= sizeof(u32); + more = *((uint32_t *) p); + p += sizeof(uint32_t); + s -= sizeof(uint32_t); switch (type) { - case C_PING: // Update the peers table. - return cluster_add_peer(addr, more, (pingt*)p); + case C_PING: // Update the peers table. + return cluster_add_peer(addr, more, (pingt *) p, s); + + case C_MASTER: // Our master is wrong + return cluster_set_master(addr, more); - case C_LASTSEEN: // Catch up a slave (slave missed a packet). + 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. struct sockaddr_in a; a.sin_addr.s_addr = more; - a.sin_port = * (int*) p; + a.sin_port = *(int *) p; s -= sizeof(int); p += sizeof(int); if (!config->cluster_iam_master) { // huh? - log(0,0,0,0, "I'm not the master, but I got a C_FORWARD from %s?\n", inet_toa(addr)); + LOG(0, 0, 0, "I'm not the master, but I got a C_FORWARD from %s?\n", fmtaddr(addr, 0)); return -1; } - log(4,0,0,0, "Got a forwarded packet... (%s:%d)\n", inet_toa(more), a.sin_port); + LOG(4, 0, 0, "Got a forwarded packet... (%s:%d)\n", fmtaddr(more, 0), a.sin_port); STAT(recv_forward); processudp(p, s, &a); return 0; } case C_THROTTLE: { // Receive a forwarded packet from a slave. if (!config->cluster_iam_master) { - log(0,0,0,0, "I'm not the master, but I got a C_THROTTLE from %s?\n", inet_toa(addr)); + LOG(0, 0, 0, "I'm not the master, but I got a C_THROTTLE from %s?\n", fmtaddr(addr, 0)); return -1; } @@ -1282,7 +1466,7 @@ int processcluster(char * data, int size, u32 addr) case C_GARDEN: // Receive a walled garden packet from a slave. if (!config->cluster_iam_master) { - log(0,0,0,0, "I'm not the master, but I got a C_GARDEN from %s?\n", inet_toa(addr)); + LOG(0, 0, 0, "I'm not the master, but I got a C_GARDEN from %s?\n", fmtaddr(addr, 0)); return -1; } @@ -1290,41 +1474,46 @@ int processcluster(char * data, int size, u32 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). if (config->cluster_iam_master) { - log(0,0,0,0, "_I_ am master, but I received a C_KILL from %s! (Seq# %d)\n", inet_toa(addr), more); + LOG(0, 0, 0, "_I_ am master, but I received a C_KILL from %s! (Seq# %d)\n", fmtaddr(addr, 0), more); return -1; } if (more != config->cluster_seq_number) { - log(0,0,0,0, "The master asked us to die but the seq number didn't match!?\n"); + LOG(0, 0, 0, "The master asked us to die but the seq number didn't match!?\n"); return -1; } if (addr != config->cluster_master_address) { - log(0,0,0,0, "Received a C_KILL from %s which doesn't match config->cluster_master_address (%x)\n", - inet_toa(addr), config->cluster_master_address); + LOG(0, 0, 0, "Received a C_KILL from %s which doesn't match config->cluster_master_address (%s)\n", + fmtaddr(addr, 0), fmtaddr(config->cluster_master_address, 1)); // We can only warn about it. The master might really have switched! } - log(0,0,0,0, "Received a valid C_KILL: I'm going to die now.\n"); + LOG(0, 0, 0, "Received a valid C_KILL: I'm going to die now.\n"); kill(0, SIGTERM); exit(0); // Lets be paranoid; return -1; // Just signalling the compiler. 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); + LOG(4, 0, 0, "Got a heartbeat from %s\n", fmtaddr(addr, 0)); + 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); + LOG(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"); + LOG(0, 0, 0, "I got a _short_ cluster heartbeat packet! This means I'm probably out of sync!!\n"); return -1; } @@ -1337,21 +1526,25 @@ int cmd_show_cluster(struct cli_def *cli, char *command, char **argv, int argc) if (CLI_HELP_REQUESTED) return CLI_HELP_NO_ARGS; - cli_print(cli, "Cluster status : %s", config->cluster_iam_master ? "Master" : "Slave" ); - cli_print(cli, "My address : %s", inet_toa(my_address)); - cli_print(cli, "VIP address : %s", inet_toa(config->bind_address)); - cli_print(cli, "Multicast address: %s", inet_toa(config->cluster_address)); + cli_print(cli, "Cluster status : %s", config->cluster_iam_master ? "Master" : "Slave" ); + cli_print(cli, "My address : %s", fmtaddr(my_address, 0)); + cli_print(cli, "VIP address : %s", fmtaddr(config->bind_address, 0)); + cli_print(cli, "Multicast address: %s", fmtaddr(config->cluster_address, 0)); cli_print(cli, "Multicast i'face : %s", config->cluster_interface); - if (!config->cluster_iam_master) { + if (!config->cluster_iam_master) { cli_print(cli, "My master : %s (last heartbeat %.1f seconds old)", - config->cluster_master_address ? inet_toa(config->cluster_master_address) : "Not defined", + config->cluster_master_address + ? fmtaddr(config->cluster_master_address, 0) + : "Not defined", 0.1 * (TIME - config->cluster_last_hb)); - cli_print(cli, "Uptodate : %s", config->cluster_iam_uptodate ? "Yes" : "No"); + cli_print(cli, "Uptodate : %s", config->cluster_iam_uptodate ? "Yes" : "No"); + cli_print(cli, "Table version # : %" PRIu64, config->cluster_table_version); cli_print(cli, "Next sequence number expected: %d", config->cluster_seq_number); cli_print(cli, "%d sessions undefined of %d", config->cluster_undefined_sessions, config->cluster_highest_sessionid); cli_print(cli, "%d tunnels undefined of %d", config->cluster_undefined_tunnels, config->cluster_highest_tunnelid); } else { + cli_print(cli, "Table version # : %" PRIu64, config->cluster_table_version); cli_print(cli, "Next heartbeat # : %d", config->cluster_seq_number); cli_print(cli, "Highest session : %d", config->cluster_highest_sessionid); cli_print(cli, "Highest tunnel : %d", config->cluster_highest_tunnelid); @@ -1362,7 +1555,7 @@ int cmd_show_cluster(struct cli_def *cli, char *command, char **argv, int argc) if (num_peers) cli_print(cli, "%20s %10s %8s", "Address", "Basetime", "Age"); for (i = 0; i < num_peers; ++i) { - cli_print(cli, "%20s %10d %8d", inet_toa(peers[i].peer), + cli_print(cli, "%20s %10u %8d", fmtaddr(peers[i].peer, 0), peers[i].basetime, TIME - peers[i].timestamp); } return CLI_OK; @@ -1387,11 +1580,11 @@ int cmd_show_cluster(struct cli_def *cli, char *command, char **argv, int argc) // // Worst case is a 50% expansion in space required (trying to // compress { 0x00, 0x01 } * N ) -int rle_compress(u8 ** src_p, int ssize, u8 *dst, int dsize) +static int rle_compress(uint8_t **src_p, int ssize, uint8_t *dst, int dsize) { int count; int orig_dsize = dsize; - u8 * x,*src; + uint8_t *x, *src; src = *src_p; while (ssize > 0 && dsize > 2) { @@ -1433,11 +1626,11 @@ int rle_compress(u8 ** src_p, int ssize, u8 *dst, int dsize) // Return the number of dst bytes used. // Updates the 'src_p' pointer to point to the // first un-used byte. -int rle_decompress(u8 ** src_p, int ssize, u8 *dst, int dsize) +static int rle_decompress(uint8_t **src_p, int ssize, uint8_t *dst, int dsize) { int count; int orig_dsize = dsize; - char * src = *src_p; + char *src = *src_p; while (ssize >0 && dsize > 0) { // While there's more to decompress, and there's room in the decompress buffer... count = *src++; --ssize; // get the count byte from the source.