// L2TPNS Clustering Stuff #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "dhcp6.h" #include "l2tpns.h" #include "cluster.h" #include "util.h" #include "tbf.h" #include "pppoe.h" #ifdef BGP #include "bgp.h" #endif /* * All cluster packets have the same format. * * One or more instances of * a 32 bit 'type' id. * a 32 bit 'extra' data dependant on the 'type'. * zero or more bytes of structure data, dependant on the type. * */ // Module variables. extern int cluster_sockfd; // The filedescriptor for the cluster communications 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_bundle_number = 0; // The next bundle 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. int forked = 0; // Sanity check: CLI must not diddle with heartbeat table #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! static struct { int type; int id; } cluster_changes[MAX_CHANGES]; // Queue of changed structures that need to go out when next heartbeat. static struct { int seq; int size; uint8_t data[MAX_HEART_SIZE]; } past_hearts[HB_HISTORY_SIZE]; // Ring buffer of heartbeats that we've recently sent out. Needed so // we can re-transmit if needed. static struct { 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 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 // // This joins the cluster multi-cast group. // int cluster_init() { 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_bundles = MAXBUNDLE-1; config->cluster_undefined_tunnels = MAXTUNNEL-1; if (!config->cluster_address) return 0; if (!*config->cluster_interface) return 0; cluster_sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(config->cluster_port); addr.sin_addr.s_addr = INADDR_ANY; setsockopt(cluster_sockfd, SOL_SOCKET, SO_REUSEADDR, &addr, sizeof(addr)); opt = fcntl(cluster_sockfd, F_GETFL, 0); fcntl(cluster_sockfd, F_SETFL, opt | O_NONBLOCK); if (bind(cluster_sockfd, (void *) &addr, sizeof(addr)) < 0) { LOG(0, 0, 0, "Failed to bind cluster socket: %s\n", strerror(errno)); return -1; } 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; } 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 (config->cluster_mcast_ttl != 1) { uint8_t ttl = 0; if (config->cluster_mcast_ttl > 0) ttl = config->cluster_mcast_ttl < 256 ? config->cluster_mcast_ttl : 255; setsockopt(cluster_sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); } 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; return cluster_sockfd; } // // Send a chunk of data to the entire cluster (usually via the multicast // address ). // 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; addr.sin_addr.s_addr = config->cluster_address; addr.sin_port = htons(config->cluster_port); addr.sin_family = AF_INET; 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, "sendto: %s\n", strerror(errno)); return -1; } return 0; } // // Add a chunk of data to a heartbeat packet. // Maintains the format. Assumes that the caller // has passed in a big enough buffer! // static void add_type(uint8_t **p, int type, int more, uint8_t *data, int size) { *((uint32_t *) (*p)) = type; *p += sizeof(uint32_t); *((uint32_t *)(*p)) = more; *p += sizeof(uint32_t); if (data && size > 0) { memcpy(*p, data, size); *p += size; } } // 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; if (config->cluster_undefined_sessions || config->cluster_undefined_tunnels || config->cluster_undefined_bundles) return; config->cluster_iam_uptodate = 1; LOG(0, 0, 0, "Now uptodate with master.\n"); advertise_routes(); } // // Send a unicast UDP packet to a peer with 'data' as the // contents. // static int peer_send_data(in_addr_t peer, uint8_t *data, int size) { struct sockaddr_in addr = {0}; if (!cluster_sockfd) return -1; if (!config->cluster_address) return 0; if (!peer) // Odd?? return -1; addr.sin_addr.s_addr = peer; addr.sin_port = htons(config->cluster_port); addr.sin_family = AF_INET; LOG_HEX(5, "Peer send", data, size); 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; } // // Send a structured message to a peer with a single element of type 'type'. // static int peer_send_message(in_addr_t peer, int type, int more, uint8_t *data, int size) { uint8_t buf[65536]; // Vast overkill. uint8_t *p = buf; 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) ); } // send a packet to the master static int _forward_packet(uint8_t *data, int size, in_addr_t addr, int port, int type) { uint8_t buf[65536]; // Vast overkill. uint8_t *p = buf; if (!config->cluster_master_address) // No election has been held yet. Just skip it. return -1; LOG(4, 0, 0, "Forwarding packet from %s to master (size %d)\n", fmtaddr(addr, 0), size); STAT(c_forwarded); add_type(&p, type, addr, (uint8_t *) &port, sizeof(port)); // ick. should be uint16_t memcpy(p, data, size); p += size; return peer_send_data(config->cluster_master_address, buf, (p - buf)); } // // Forward a state changing packet to the master. // // The master just processes the payload as if it had // received it off the tun device. //(note: THIS ROUTINE WRITES TO pack[-6]). int master_forward_packet(uint8_t *data, int size, in_addr_t addr, uint16_t port, uint16_t indexudp) { uint8_t *p = data - (3 * sizeof(uint32_t)); uint8_t *psave = p; uint32_t indexandport = port | ((indexudp << 16) & 0xFFFF0000); if (!config->cluster_master_address) // No election has been held yet. Just skip it. return -1; 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, (uint8_t *) &indexandport, sizeof(indexandport)); return peer_send_data(config->cluster_master_address, psave, size + (3 * sizeof(uint32_t))); } // Forward PPPOE packet to the master. //(note: THIS ROUTINE WRITES TO pack[-4]). int master_forward_pppoe_packet(uint8_t *data, int size, uint8_t codepad) { uint8_t *p = data - (2 * sizeof(uint32_t)); uint8_t *psave = p; if (!config->cluster_master_address) // No election has been held yet. Just skip it. return -1; LOG(4, 0, 0, "Forward PPPOE packet to master, code %s (size %d)\n", get_string_codepad(codepad), size); STAT(c_forwarded); add_type(&p, C_PPPOE_FORWARD, codepad, NULL, 0); return peer_send_data(config->cluster_master_address, psave, size + (2 * sizeof(uint32_t))); } // Forward a DAE RADIUS packet to the master. int master_forward_dae_packet(uint8_t *data, int size, in_addr_t addr, int port) { return _forward_packet(data, size, addr, port, C_FORWARD_DAE); } // // Forward a throttled packet to the master for handling. // // The master just drops the packet into the appropriate // token bucket queue, and lets normal processing take care // of it. // int master_throttle_packet(int tbfid, uint8_t *data, int size) { uint8_t buf[65536]; // Vast overkill. uint8_t *p = buf; if (!config->cluster_master_address) // No election has been held yet. Just skip it. return -1; LOG(4, 0, 0, "Throttling packet master (size %d, tbfid %d)\n", size, tbfid); add_type(&p, C_THROTTLE, tbfid, data, size); return peer_send_data(config->cluster_master_address, buf, (p-buf) ); } // // Forward a walled garden packet to the master for handling. // // The master just writes the packet straight to the tun // device (where is will normally loop through the // firewall rules, and come back in on the tun device) // // (Note that this must be called with the tun header // as the start of the data). int master_garden_packet(sessionidt s, uint8_t *data, int size) { uint8_t buf[65536]; // Vast overkill. uint8_t *p = buf; if (!config->cluster_master_address) // No election has been held yet. Just skip it. return -1; LOG(4, 0, 0, "Walled garden packet to master (size %d)\n", size); add_type(&p, C_GARDEN, s, data, size); return peer_send_data(config->cluster_master_address, buf, (p-buf)); } // // Forward a MPPP packet to the master for handling. // // (Note that this must be called with the tun header // as the start of the data). // (i.e. this routine writes to data[-8]). int master_forward_mppp_packet(sessionidt s, uint8_t *data, int size) { uint8_t *p = data - (2 * sizeof(uint32_t)); uint8_t *psave = p; if (!config->cluster_master_address) // No election has been held yet. Just skip it. return -1; LOG(4, 0, 0, "Forward MPPP packet to master (size %d)\n", size); add_type(&p, C_MPPP_FORWARD, s, NULL, 0); return peer_send_data(config->cluster_master_address, psave, size + (2 * sizeof(uint32_t))); } // // 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, uint8_t *data, int 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); } // // Send an 'i am alive' message to every machine in the cluster. // void cluster_send_ping(time_t basetime) { uint8_t buff[100 + sizeof(pingt)]; uint8_t *p = buff; pingt x; if (config->cluster_iam_master && basetime) // We're heartbeating so no need to ping. return; LOG(5, 0, 0, "Sending cluster ping...\n"); x.ver = 1; x.addr = config->bind_address; x.undef = config->cluster_undefined_sessions + config->cluster_undefined_tunnels + config->cluster_undefined_bundles; x.basetime = basetime; add_type(&p, C_PING, basetime, (uint8_t *) &x, sizeof(x)); cluster_send_data(buff, (p-buff) ); } // // Walk the session counters looking for non-zero ones to send // 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 (600) void master_update_counts(void) { int i, c; bytest b[MAX_B_RECS+1]; if (config->cluster_iam_master) // Only happens on the slaves. return; if (!config->cluster_master_address) // If we don't have a master, skip it for a while. return; i = MAX_B_RECS * 5; // Examine max 3000 sessions; if (config->cluster_highest_sessionid > i) i = config->cluster_highest_sessionid; for ( c = 0; i > 0 ; --i) { // Next session to look at. walk_session_number++; if ( walk_session_number > config->cluster_highest_sessionid) walk_session_number = 1; if (!sess_local[walk_session_number].cin && !sess_local[walk_session_number].cout) continue; // Unchanged. Skip it. b[c].sid = walk_session_number; b[c].pin = sess_local[walk_session_number].pin; b[c].pout = sess_local[walk_session_number].pout; b[c].cin = sess_local[walk_session_number].cin; b[c].cout = sess_local[walk_session_number].cout; // Reset counters. sess_local[walk_session_number].pin = sess_local[walk_session_number].pout = 0; sess_local[walk_session_number].cin = sess_local[walk_session_number].cout = 0; if (++c > MAX_B_RECS) // Send a max of 600 elements in a packet. break; } if (!c) // Didn't find any that changes. Get out of here! return; // Forward the data to the master. LOG(4, 0, 0, "Sending byte counters to master (%d elements)\n", c); peer_send_message(config->cluster_master_address, C_BYTES, c, (uint8_t *) &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, high_unique_id = 0; 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 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))); 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! config->cluster_last_hb = TIME + 1; // Just the one election thanks. config->cluster_master_address = 0; LOG(0, 0, 0, "Master timed out! Holding election...\n"); // 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. if (peers[i].basetime < basetime) { 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, "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 // and I'm better than an of my peers so it's time // to become a master!!! config->cluster_iam_master = 1; pppoe_send_garp(); // gratuitous arp of the pppoe interface 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; // // Go through and mark all the tunnels as defined. // Count the highest used tunnel number as well. // config->cluster_highest_tunnelid = 0; for (i = 0; i < MAXTUNNEL; ++i) { if (tunnel[i].state == TUNNELUNDEF) tunnel[i].state = TUNNELFREE; if (tunnel[i].state != TUNNELFREE && i > config->cluster_highest_tunnelid) config->cluster_highest_tunnelid = i; } // // Go through and mark all the bundles as defined. // Count the highest used bundle number as well. // config->cluster_highest_bundleid = 0; for (i = 0; i < MAXBUNDLE; ++i) { if (bundle[i].state == BUNDLEUNDEF) bundle[i].state = BUNDLEFREE; if (bundle[i].state != BUNDLEFREE && i > config->cluster_highest_bundleid) config->cluster_highest_bundleid = i; } // // Go through and mark all the sessions as being defined. // reset the idle timeouts. // add temporary byte counters to permanent ones. // Re-string the free list. // Find the ID of the highest session. last_free = 0; high_unique_id = 0; config->cluster_highest_sessionid = 0; for (i = 0, count = 0; i < MAXSESSION; ++i) { if (session[i].tunnel == T_UNDEF) { session[i].tunnel = T_FREE; ++count; } 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 idle timeouts.. session[i].last_packet = session[i].last_data = 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/packet counters. increment_counter(&session[i].cin, &session[i].cin_wrap, sess_local[i].cin); increment_counter(&session[i].cout, &session[i].cout_wrap, sess_local[i].cout); session[i].cin_delta += sess_local[i].cin; session[i].cout_delta += sess_local[i].cout; session[i].pin += sess_local[i].pin; session[i].pout += sess_local[i].pout; sess_local[i].cin = sess_local[i].cout = 0; sess_local[i].pin = sess_local[i].pout = 0; 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; session[i].tbf_in = session[i].tbf_out = 0; // Remove stale pointers from old master. 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_id = high_unique_id; // Keep track of the highest used session ID. become_master(); rebuild_address_pool(); // If we're not the very first master, this is a big issue! if (count > 0) LOG(0, 0, 0, "Warning: Fixed %d uninitialized sessions in becoming master!\n", count); config->cluster_undefined_sessions = 0; config->cluster_undefined_bundles = 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. } // // Check that our session table is validly matching what the // master has in mind. // // In particular, if we have too many sessions marked 'undefined' // we fix it up here, and we ensure that the 'first free session' // pointer is valid. // static void cluster_check_sessions(int highsession, int freesession_ptr, int highbundle, int hightunnel) { int i; sessionfree = freesession_ptr; // Keep the freesession ptr valid. if (config->cluster_iam_uptodate) return; if (highsession > config->cluster_undefined_sessions && highbundle > config->cluster_undefined_bundles && hightunnel > config->cluster_undefined_tunnels) return; // Clear out defined sessions, counting the number of // undefs remaining. config->cluster_undefined_sessions = 0; for (i = 1 ; i < MAXSESSION; ++i) { if (i > highsession) { if (session[i].tunnel == T_UNDEF) session[i].tunnel = T_FREE; // Defined. continue; } if (session[i].tunnel == T_UNDEF) ++config->cluster_undefined_sessions; } // Clear out defined bundles, counting the number of // undefs remaining. config->cluster_undefined_bundles = 0; for (i = 1 ; i < MAXBUNDLE; ++i) { if (i > highbundle) { if (bundle[i].state == BUNDLEUNDEF) bundle[i].state = BUNDLEFREE; // Defined. continue; } if (bundle[i].state == BUNDLEUNDEF) ++config->cluster_undefined_bundles; } // Clear out defined tunnels, counting the number of // undefs remaining. config->cluster_undefined_tunnels = 0; for (i = 1 ; i < MAXTUNNEL; ++i) { if (i > hightunnel) { if (tunnel[i].state == TUNNELUNDEF) tunnel[i].state = TUNNELFREE; // Defined. continue; } if (tunnel[i].state == TUNNELUNDEF) ++config->cluster_undefined_tunnels; } if (config->cluster_undefined_sessions || config->cluster_undefined_tunnels || config->cluster_undefined_bundles) { LOG(2, 0, 0, "Cleared undefined sessions/bundles/tunnels. %d sess (high %d), %d bund (high %d), %d tunn (high %d)\n", config->cluster_undefined_sessions, highsession, config->cluster_undefined_bundles, highbundle, config->cluster_undefined_tunnels, hightunnel); return; } // Are we up to date? if (!config->cluster_iam_uptodate) cluster_uptodate(); } static int hb_add_type(uint8_t **p, int type, int id) { switch (type) { case C_CSESSION: { // Compressed C_SESSION. 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) ); // 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, c, size); break; } // Failed to compress : Fall through. } case C_SESSION: add_type(p, C_SESSION, id, (uint8_t *) &session[id], sizeof(sessiont)); break; case C_CBUNDLE: { // Compressed C_BUNDLE uint8_t c[sizeof(bundlet) * 2]; // Bigger than worst case. uint8_t *d = (uint8_t *) &bundle[id]; uint8_t *orig = d; int size; size = rle_compress( &d, sizeof(bundlet), c, sizeof(c) ); // Did we compress the full structure, and is the size actually // reduced?? if ( (d - orig) == sizeof(bundlet) && size < sizeof(bundlet) ) { add_type(p, C_CBUNDLE, id, c, size); break; } // Failed to compress : Fall through. } case C_BUNDLE: add_type(p, C_BUNDLE, id, (uint8_t *) &bundle[id], sizeof(bundlet)); break; case C_CTUNNEL: { // Compressed C_TUNNEL 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) ); // Did we compress the full structure, and is the size actually // reduced?? if ( (d - orig) == sizeof(tunnelt) && size < sizeof(tunnelt) ) { add_type(p, C_CTUNNEL, id, c, size); break; } // Failed to compress : Fall through. } case C_TUNNEL: add_type(p, C_TUNNEL, id, (uint8_t *) &tunnel[id], sizeof(tunnelt)); break; default: LOG(0, 0, 0, "Found an invalid type in heart queue! (%d)\n", type); kill(0, SIGTERM); exit(1); } return 0; } // // Send a heartbeat, incidently sending out any queued changes.. // void cluster_heartbeat() { int i, count = 0, tcount = 0, bcount = 0; uint8_t buff[MAX_HEART_SIZE + sizeof(heartt) + sizeof(int) ]; heartt h; uint8_t *p = buff; if (!config->cluster_iam_master) // Only the master does this. return; 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 = config->cluster_highest_sessionid; h.freesession = sessionfree; h.hightunnel = config->cluster_highest_tunnelid; h.highbundle = config->cluster_highest_bundleid; h.size_sess = sizeof(sessiont); // Just in case. h.size_bund = sizeof(bundlet); 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, (uint8_t *) &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, "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(uint32_t) * 2 + sizeof(sessiont) * 2 ) < (buff + MAX_HEART_SIZE) ) { if (!walk_session_number) // session #0 isn't valid. ++walk_session_number; 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)%(config->cluster_highest_sessionid+1); // +1 avoids divide by zero. ++count; // Count the number of extra sessions we're sending. } // // Fill out the packet with tunnels from the tunnel table... // This effectively means we walk the tunnel table more quickly // 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(uint32_t) * 2 + sizeof(tunnelt) ) < (buff + MAX_HEART_SIZE) ) { if (!walk_tunnel_number) // tunnel #0 isn't valid. ++walk_tunnel_number; if (tcount >= config->cluster_highest_tunnelid) break; hb_add_type(&p, C_CTUNNEL, walk_tunnel_number); walk_tunnel_number = (1+walk_tunnel_number)%(config->cluster_highest_tunnelid+1); // +1 avoids divide by zero. ++tcount; } // // Fill out the packet with bundles from the bundle table... while ( (p + sizeof(uint32_t) * 2 + sizeof(bundlet) ) < (buff + MAX_HEART_SIZE) ) { if (!walk_bundle_number) // bundle #0 isn't valid. ++walk_bundle_number; if (bcount >= config->cluster_highest_bundleid) break; hb_add_type(&p, C_CBUNDLE, walk_bundle_number); walk_bundle_number = (1+walk_bundle_number)%(config->cluster_highest_bundleid+1); // +1 avoids divide by zero. ++bcount; } // // Did we do something wrong? if (p > (buff + sizeof(buff))) { // Did we somehow manage to overun the buffer? 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(4, 0, 0, "Sending v%d heartbeat #%d, change #%" PRIu64 " with %d changes " "(%d x-sess, %d x-bundles, %d x-tunnels, %d highsess, %d highbund, %d hightun, size %d)\n", HB_VERSION, h.seq, h.table_version, config->cluster_num_changes, count, bcount, tcount, config->cluster_highest_sessionid, config->cluster_highest_bundleid, config->cluster_highest_tunnelid, (int) (p - buff)); config->cluster_num_changes = 0; send_heartbeat(h.seq, buff, (p-buff) ); // Send out the heartbeat to the cluster, keeping a copy of it. config->cluster_seq_number = (config->cluster_seq_number+1)%HB_MAX_SEQ; // Next seq number to use. } // // A structure of type 'type' has changed; Add it to the queue to send. // static int type_changed(int type, int id) { int i; for (i = 0 ; i < config->cluster_num_changes ; ++i) { if ( cluster_changes[i].id == id && cluster_changes[i].type == type) { // Already marked for change, remove it --config->cluster_num_changes; memmove(&cluster_changes[i], &cluster_changes[i+1], (config->cluster_num_changes - i) * sizeof(cluster_changes[i])); break; } } cluster_changes[config->cluster_num_changes].type = type; cluster_changes[config->cluster_num_changes].id = id; ++config->cluster_num_changes; if (config->cluster_num_changes > MAX_CHANGES) cluster_heartbeat(); // flush now return 1; } // A particular session has been changed! int cluster_send_session(int sid) { if (!config->cluster_iam_master) { LOG(0, sid, 0, "I'm not a master, but I just tried to change a session!\n"); return -1; } if (forked) { LOG(0, sid, 0, "cluster_send_session called from child process!\n"); return -1; } return type_changed(C_CSESSION, sid); } // A particular bundle has been changed! int cluster_send_bundle(int bid) { if (!config->cluster_iam_master) { LOG(0, 0, bid, "I'm not a master, but I just tried to change a bundle!\n"); return -1; } return type_changed(C_CBUNDLE, bid); } // A particular tunnel has been changed! int cluster_send_tunnel(int tid) { if (!config->cluster_iam_master) { LOG(0, 0, tid, "I'm not a master, but I just tried to change a tunnel!\n"); return -1; } return type_changed(C_CTUNNEL, tid); } // // We're a master, and a slave has just told us that it's // missed a packet. We'll resend it every packet since // the last one it's seen. // static int cluster_catchup_slave(int seq, in_addr_t slave) { int s; 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) diff += HB_MAX_SEQ; if (diff >= HB_HISTORY_SIZE) { // Ouch. We don't have the packet to send it! 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; 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); return -1; // What to do here!? } peer_send_data(slave, past_hearts[s].data, past_hearts[s].size); seq = (seq+1)%HB_MAX_SEQ; // Increment to next seq number. } return 0; // All good! } // // We've heard from another peer! Add it to the list // that we select from at election time. // static int cluster_add_peer(in_addr_t peer, time_t basetime, pingt *pp, int size) { int i; 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; if (clusterid != config->bind_address) { // Is this for us? LOG(4, 0, 0, "Skipping ping from %s (different cluster)\n", fmtaddr(peer, 0)); return 0; } for (i = 0; i < num_peers ; ++i) { if (peers[i].peer != peer) continue; // 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(); } if (i >= num_peers) { 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].basetime) // Shutdown break; if ((peers[i].timestamp + config->cluster_hb_timeout * 10) < TIME) // Stale. break; } if (i >= CLUSTER_MAX_SIZE) { // Too many peers!! 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, "Added %s as a new peer. Now %d peers\n", fmtaddr(peer, 0), num_peers); } 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; if (master) { // catchup with new master peer_send_message(master, C_LASTSEEN, config->cluster_seq_number, NULL, 0); // delay next election config->cluster_last_hb = TIME; } // run election (or reset "probed" if master was set) 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 // the slow table walk to propogate this back out to the slaves. // static int cluster_handle_bytes(uint8_t *data, int size) { bytest *b; b = (bytest *) data; 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, "Got C_BYTES with session #%d!\n", b->sid); return -1; /* Abort processing */ } session[b->sid].pin += b->pin; session[b->sid].pout += b->pout; increment_counter(&session[b->sid].cin, &session[b->sid].cin_wrap, b->cin); increment_counter(&session[b->sid].cout, &session[b->sid].cout_wrap, b->cout); session[b->sid].cin_delta += b->cin; session[b->sid].cout_delta += b->cout; if (b->cin) session[b->sid].last_packet = session[b->sid].last_data = time_now; else if (b->cout) session[b->sid].last_data = time_now; size -= sizeof(*b); ++b; } if (size != 0) LOG(0, 0, 0, "Got C_BYTES with %d bytes of trailing junk!\n", size); return size; } // // Handle receiving a session structure in a heartbeat packet. // static int cluster_recv_session(int more, uint8_t *p) { if (more >= MAXSESSION) { 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, "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.. 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_bundle(int more, uint8_t *p) { if (more >= MAXBUNDLE) { LOG(0, 0, 0, "DANGER: Received a bundle id > MAXBUNDLE!\n"); return -1; } if (bundle[more].state == BUNDLEUNDEF) { if (config->cluster_iam_uptodate) { // Sanity. LOG(0, 0, 0, "I thought I was uptodate but I just found an undefined bundle!\n"); } else { --config->cluster_undefined_bundles; } } memcpy(&bundle[more], p, sizeof(bundle[more]) ); LOG(5, 0, more, "Received bundle update\n"); 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, uint8_t *p) { if (more >= MAXTUNNEL) { 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, "I thought I was uptodate but I just found an undefined tunnel!\n"); } else { --config->cluster_undefined_tunnels; } } memcpy(&tunnel[more], p, sizeof(tunnel[more]) ); // // Clear tunnel control messages. These are dynamically allocated. // If we get unlucky, this may cause the tunnel to drop! // tunnel[more].controls = tunnel[more].controle = NULL; tunnel[more].controlc = 0; LOG(5, 0, more, "Received tunnel update\n"); if (!config->cluster_iam_uptodate) cluster_uptodate(); // Check to see if we're up to date. return 0; } // pre v6 heartbeat session structure struct oldsession { sessionidt next; sessionidt far; tunnelidt tunnel; uint8_t flags; struct { uint8_t phase; uint8_t lcp:4; uint8_t ipcp:4; uint8_t ipv6cp:4; uint8_t ccp:4; } ppp; char reserved_1[2]; in_addr_t ip; int ip_pool_index; uint32_t unique_id; char reserved_2[4]; uint32_t magic; uint32_t pin, pout; uint32_t cin, cout; uint32_t cin_wrap, cout_wrap; uint32_t cin_delta, cout_delta; uint16_t throttle_in; uint16_t throttle_out; uint8_t filter_in; uint8_t filter_out; uint16_t mru; clockt opened; clockt die; uint32_t session_timeout; uint32_t idle_timeout; time_t last_packet; time_t last_data; in_addr_t dns1, dns2; routet route[MAXROUTE]; uint16_t tbf_in; uint16_t tbf_out; int random_vector_length; uint8_t random_vector[MAXTEL]; char user[MAXUSER]; char called[MAXTEL]; char calling[MAXTEL]; uint32_t tx_connect_speed; uint32_t rx_connect_speed; clockt timeout; uint32_t mrru; uint8_t mssf; epdist epdis; bundleidt bundle; in_addr_t snoop_ip; uint16_t snoop_port; uint8_t walled_garden; uint8_t ipv6prefixlen; struct in6_addr ipv6route; char reserved_3[11]; }; struct oldsessionV7 { sessionidt next; // next session in linked list sessionidt far; // far end session ID tunnelidt tunnel; // near end tunnel ID uint8_t flags; // session flags: see SESSION_* struct { uint8_t phase; // PPP phase uint8_t lcp:4; // LCP state uint8_t ipcp:4; // IPCP state uint8_t ipv6cp:4; // IPV6CP state uint8_t ccp:4; // CCP state } ppp; uint16_t mru; // maximum receive unit in_addr_t ip; // IP of session set by RADIUS response (host byte order). int ip_pool_index; // index to IP pool uint32_t unique_id; // unique session id uint32_t magic; // ppp magic number uint32_t pin, pout; // packet counts uint32_t cin, cout; // byte counts uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords) uint32_t cin_delta, cout_delta; // byte count changes (for dump_session()) uint16_t throttle_in; // upstream throttle rate (kbps) uint16_t throttle_out; // downstream throttle rate uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none) uint8_t filter_out; // output filter index uint16_t snoop_port; // Interception destination port in_addr_t snoop_ip; // Interception destination IP clockt opened; // when started clockt die; // being closed, when to finally free uint32_t session_timeout; // Maximum session time in seconds uint32_t idle_timeout; // Maximum idle time in seconds time_t last_packet; // Last packet from the user (used for idle timeouts) time_t last_data; // Last data packet to/from the user (used for idle timeouts) in_addr_t dns1, dns2; // DNS servers routet route[MAXROUTE]; // static routes uint16_t tbf_in; // filter bucket for throttling in from the user. uint16_t tbf_out; // filter bucket for throttling out to the user. int random_vector_length; uint8_t random_vector[MAXTEL]; char user[MAXUSER]; // user (needed in session for radius stop messages) char called[MAXTEL]; // called number char calling[MAXTEL]; // calling number uint32_t tx_connect_speed; uint32_t rx_connect_speed; clockt timeout; // Session timeout uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit epdist epdis; // Multilink Endpoint Discriminator bundleidt bundle; // Multilink Bundle Identifier uint8_t mssf; // Multilink Short Sequence Number Header Format uint8_t walled_garden; // is this session gardened? uint8_t classlen; // class (needed for radius accounting messages) char class[MAXCLASS]; uint8_t ipv6prefixlen; // IPv6 route prefix length struct in6_addr ipv6route; // Static IPv6 route sessionidt forwardtosession; // LNS id_session to forward uint8_t src_hwaddr[ETH_ALEN]; // MAC addr source (for pppoe sessions 6 bytes) char reserved[4]; // Space to expand structure without changing HB_VERSION }; struct oldsessionV8 { sessionidt next; // next session in linked list sessionidt far; // far end session ID tunnelidt tunnel; // near end tunnel ID uint8_t flags; // session flags: see SESSION_* struct { uint8_t phase; // PPP phase uint8_t lcp:4; // LCP state uint8_t ipcp:4; // IPCP state uint8_t ipv6cp:4; // IPV6CP state uint8_t ccp:4; // CCP state } ppp; uint16_t mru; // maximum receive unit in_addr_t ip; // IP of session set by RADIUS response (host byte order). int ip_pool_index; // index to IP pool uint32_t unique_id; // unique session id uint32_t magic; // ppp magic number uint32_t pin, pout; // packet counts uint32_t cin, cout; // byte counts uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords) uint32_t cin_delta, cout_delta; // byte count changes (for dump_session()) uint16_t throttle_in; // upstream throttle rate (kbps) uint16_t throttle_out; // downstream throttle rate uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none) uint8_t filter_out; // output filter index uint16_t snoop_port; // Interception destination port in_addr_t snoop_ip; // Interception destination IP clockt opened; // when started clockt die; // being closed, when to finally free uint32_t session_timeout; // Maximum session time in seconds uint32_t idle_timeout; // Maximum idle time in seconds time_t last_packet; // Last packet from the user (used for idle timeouts) time_t last_data; // Last data packet to/from the user (used for idle timeouts) in_addr_t dns1, dns2; // DNS servers routet route[MAXROUTE]; // static routes uint16_t tbf_in; // filter bucket for throttling in from the user. uint16_t tbf_out; // filter bucket for throttling out to the user. int random_vector_length; uint8_t random_vector[MAXTEL]; char user[MAXUSER]; // user (needed in session for radius stop messages) char called[MAXTEL]; // called number char calling[MAXTEL]; // calling number uint32_t tx_connect_speed; uint32_t rx_connect_speed; clockt timeout; // Session timeout uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit epdist epdis; // Multilink Endpoint Discriminator bundleidt bundle; // Multilink Bundle Identifier uint8_t mssf; // Multilink Short Sequence Number Header Format uint8_t walled_garden; // is this session gardened? uint8_t classlen; // class (needed for radius accounting messages) char class[MAXCLASS]; uint8_t ipv6prefixlen; // IPv6 route prefix length struct in6_addr ipv6route; // Static IPv6 route sessionidt forwardtosession; // LNS id_session to forward uint8_t src_hwaddr[ETH_ALEN]; // MAC addr source (for pppoe sessions 6 bytes) uint32_t dhcpv6_prefix_iaid; // prefix iaid requested by client uint32_t dhcpv6_iana_iaid; // iaid of iana requested by client struct in6_addr ipv6address; // Framed Ipv6 address struct dhcp6_opt_clientid dhcpv6_client_id; // Size max (headers + DUID) char reserved[4]; // Space to expand structure without changing HB_VERSION }; 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.flags = old->flags; new.ppp.phase = old->ppp.phase; new.ppp.lcp = old->ppp.lcp; new.ppp.ipcp = old->ppp.ipcp; new.ppp.ipv6cp = old->ppp.ipv6cp; new.ppp.ccp = old->ppp.ccp; new.ip = old->ip; new.ip_pool_index = old->ip_pool_index; new.unique_id = old->unique_id; new.magic = old->magic; new.pin = old->pin; new.pout = old->pout; new.cin = old->cin; new.cout = old->cout; new.cin_wrap = old->cin_wrap; new.cout_wrap = old->cout_wrap; new.cin_delta = old->cin_delta; new.cout_delta = old->cout_delta; 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.session_timeout = old->session_timeout; new.idle_timeout = old->idle_timeout; new.last_packet = old->last_packet; new.last_data = old->last_data; 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.timeout = old->timeout; new.mrru = old->mrru; new.mssf = old->mssf; new.epdis = old->epdis; new.bundle = old->bundle; new.snoop_ip = old->snoop_ip; new.snoop_port = old->snoop_port; new.walled_garden = old->walled_garden; new.route6[0].ipv6prefixlen = old->ipv6prefixlen; new.route6[0].ipv6route = old->ipv6route; 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; } static uint8_t *convert_sessionV7(struct oldsessionV7 *old) { static sessiont new; int i; memset(&new, 0, sizeof(new)); new.next = old->next; new.far = old->far; new.tunnel = old->tunnel; new.flags = old->flags; new.ppp.phase = old->ppp.phase; new.ppp.lcp = old->ppp.lcp; new.ppp.ipcp = old->ppp.ipcp; new.ppp.ipv6cp = old->ppp.ipv6cp; new.ppp.ccp = old->ppp.ccp; new.mru = old->mru; new.ip = old->ip; new.ip_pool_index = old->ip_pool_index; new.unique_id = old->unique_id; new.magic = old->magic; new.pin = old->pin; new.pout = old->pout; new.cin = old->cin; new.cout = old->cout; new.cin_wrap = old->cin_wrap; new.cout_wrap = old->cout_wrap; new.cin_delta = old->cin_delta; new.cout_delta = old->cout_delta; 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.snoop_port = old->snoop_port; new.snoop_ip = old->snoop_ip; new.opened = old->opened; new.die = old->die; new.session_timeout = old->session_timeout; new.idle_timeout = old->idle_timeout; new.last_packet = old->last_packet; new.last_data = old->last_data; new.dns1 = old->dns1; new.dns2 = old->dns2; for (i = 0; i < MAXROUTE; i++) memcpy(&new.route[i], &old->route[i], sizeof(new.route[i])); new.tbf_in = old->tbf_in; new.tbf_out = old->tbf_out; new.random_vector_length = old->random_vector_length; 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)); new.tx_connect_speed = old->tx_connect_speed; new.rx_connect_speed = old->rx_connect_speed; new.timeout = old->timeout; new.mrru = old->mrru; new.epdis = old->epdis; new.bundle = old->bundle; new.mssf = old->mssf; new.walled_garden = old->walled_garden; new.classlen = old->classlen; memcpy(new.class, old->class, sizeof(new.class)); new.route6[0].ipv6prefixlen = old->ipv6prefixlen; new.route6[0].ipv6route = old->ipv6route; new.forwardtosession = old->forwardtosession; memcpy(new.src_hwaddr, old->src_hwaddr, sizeof(new.src_hwaddr)); return (uint8_t *) &new; } static uint8_t *convert_sessionV8(struct oldsessionV8 *old) { static sessiont new; int i; memset(&new, 0, sizeof(new)); new.next = old->next; new.far = old->far; new.tunnel = old->tunnel; new.flags = old->flags; new.ppp.phase = old->ppp.phase; new.ppp.lcp = old->ppp.lcp; new.ppp.ipcp = old->ppp.ipcp; new.ppp.ipv6cp = old->ppp.ipv6cp; new.ppp.ccp = old->ppp.ccp; new.mru = old->mru; new.ip = old->ip; new.ip_pool_index = old->ip_pool_index; new.unique_id = old->unique_id; new.magic = old->magic; new.pin = old->pin; new.pout = old->pout; new.cin = old->cin; new.cout = old->cout; new.cin_wrap = old->cin_wrap; new.cout_wrap = old->cout_wrap; new.cin_delta = old->cin_delta; new.cout_delta = old->cout_delta; 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.snoop_port = old->snoop_port; new.snoop_ip = old->snoop_ip; new.opened = old->opened; new.die = old->die; new.session_timeout = old->session_timeout; new.idle_timeout = old->idle_timeout; new.last_packet = old->last_packet; new.last_data = old->last_data; new.dns1 = old->dns1; new.dns2 = old->dns2; for (i = 0; i < MAXROUTE; i++) memcpy(&new.route[i], &old->route[i], sizeof(new.route[i])); new.tbf_in = old->tbf_in; new.tbf_out = old->tbf_out; new.random_vector_length = old->random_vector_length; 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)); new.tx_connect_speed = old->tx_connect_speed; new.rx_connect_speed = old->rx_connect_speed; new.timeout = old->timeout; new.mrru = old->mrru; new.epdis = old->epdis; new.bundle = old->bundle; new.mssf = old->mssf; new.walled_garden = old->walled_garden; new.classlen = old->classlen; memcpy(new.class, old->class, sizeof(new.class)); new.route6[0].ipv6prefixlen = old->ipv6prefixlen; new.route6[0].ipv6route = old->ipv6route; new.forwardtosession = old->forwardtosession; memcpy(new.src_hwaddr, old->src_hwaddr, sizeof(new.src_hwaddr)); new.dhcpv6_prefix_iaid = old->dhcpv6_prefix_iaid; new.dhcpv6_iana_iaid = old->dhcpv6_iana_iaid; new.ipv6address = old->ipv6address; new.dhcpv6_client_id = old->dhcpv6_client_id; return (uint8_t *) &new; } // // Process a heartbeat.. // // v6: added RADIUS class attribute, re-ordered session structure // v7: added tunnelt attribute at the end of struct (tunnelt size change) 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 != 9 # error "need to update cluster_process_heartbeat()" #endif // we handle versions 5 through 8 if (hb_ver < 5 || 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?? } if (size > sizeof(past_hearts[0].data)) { LOG(0, 0, 0, "Received an oversize heartbeat from %s (%d)!\n", fmtaddr(addr, 0), size); return -1; } if (s < sizeof(*h)) goto shortpacket; h = (heartt *) p; p += sizeof(*h); s -= sizeof(*h); if (h->clusterid != config->bind_address) return -1; // It's not part of our cluster. if (config->cluster_iam_master) { // Sanity... // Note that this MUST match the election process above! 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, "Heartbeat with zero basetime! Ignoring\n"); return -1; // Skip it. } 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, "They're an older master than me so I'm gone!\n"); kill(0, SIGTERM); exit(1); } 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!! config->cluster_last_hb_ver = hb_ver; // remember what cluster version the master is using if (config->cluster_seq_number != h->seq) { // Out of sequence heartbeat! 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); 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!! // Just drop the packet. The master will resend it as part of the catchup. return 0; } // Save the packet in our buffer. // This is needed in case we become the master. config->cluster_seq_number = (h->seq+1)%HB_MAX_SEQ; i = h->seq % HB_HISTORY_SIZE; past_hearts[i].seq = h->seq; past_hearts[i].size = size; memcpy(&past_hearts[i].data, data, size); // Save it. // Check that we don't have too many undefined sessions, and // that the free session pointer is correct. cluster_check_sessions(h->highsession, h->freesession, h->highbundle, 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 = *((uint32_t *) p); p += sizeof(uint32_t); s -= sizeof(uint32_t); more = *((uint32_t *) p); p += sizeof(uint32_t); s -= sizeof(uint32_t); switch (type) { case C_CSESSION: { // Compressed session structure. uint8_t c[ sizeof(sessiont) + 2]; int size; uint8_t *orig_p = p; size = rle_decompress((uint8_t **) &p, s, c, sizeof(c) ); s -= (p - orig_p); // session struct changed with v5 if (hb_ver < 6) { 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! if ((hb_ver < HB_VERSION) && (size < sizeof(sessiont))) { if ((hb_ver == 7) && (size == sizeof(struct oldsessionV7))) cluster_recv_session(more, convert_sessionV7((struct oldsessionV7 *) c)); else if (size == sizeof(struct oldsessionV8)) cluster_recv_session(more, convert_sessionV8((struct oldsessionV8 *) c)); else LOG(0, 0, 0, "DANGER: Received a CSESSION version=%d that didn't decompress correctly!\n", hb_ver); break; } else { LOG(0, 0, 0, "DANGER: Received a CSESSION that didn't decompress correctly!\n"); // Now what? Should exit! No-longer up to date! break; } } cluster_recv_session(more, c); break; } case C_SESSION: if (hb_ver < 6) { 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; cluster_recv_session(more, p); p += sizeof(session[more]); s -= sizeof(session[more]); break; case C_CTUNNEL: { // Compressed tunnel structure. uint8_t c[ sizeof(tunnelt) + 2]; int size; uint8_t *orig_p = p; size = rle_decompress((uint8_t **) &p, s, c, sizeof(c)); s -= (p - orig_p); if ( ((hb_ver >= HB_VERSION) && (size != sizeof(tunnelt))) || ((hb_ver < HB_VERSION) && (size > sizeof(tunnelt))) ) { // Ouch! Very very bad! LOG(0, 0, 0, "DANGER: Received a CTUNNEL that didn't decompress correctly!\n"); // Now what? Should exit! No-longer up to date! break; } cluster_recv_tunnel(more, c); break; } case C_TUNNEL: if ( s < sizeof(tunnel[more])) goto shortpacket; cluster_recv_tunnel(more, p); p += sizeof(tunnel[more]); s -= sizeof(tunnel[more]); break; case C_CBUNDLE: { // Compressed bundle structure. uint8_t c[ sizeof(bundlet) + 2]; int size; uint8_t *orig_p = p; size = rle_decompress((uint8_t **) &p, s, c, sizeof(c)); s -= (p - orig_p); if (size != sizeof(bundlet) ) { // Ouch! Very very bad! LOG(0, 0, 0, "DANGER: Received a CBUNDLE that didn't decompress correctly!\n"); // Now what? Should exit! No-longer up to date! break; } cluster_recv_bundle(more, c); break; } case C_BUNDLE: if ( s < sizeof(bundle[more])) goto shortpacket; cluster_recv_bundle(more, p); p += sizeof(bundle[more]); s -= sizeof(bundle[more]); break; default: 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) { 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_last_hb = TIME; // Successfully received a heartbeat! config->cluster_table_version = h->table_version; return 0; shortpacket: LOG(0, 0, 0, "I got an incomplete heartbeat packet! This means I'm probably out of sync!!\n"); return -1; } // // We got a packet on the cluster port! // Handle pings, lastseens, and heartbeats! // int processcluster(uint8_t *data, int size, in_addr_t addr) { int type, more; uint8_t *p = data; int s = size; if (addr == my_address) return -1; // Ignore it. Something looped back the multicast! LOG(5, 0, 0, "Process cluster: %d bytes from %s\n", size, fmtaddr(addr, 0)); if (s <= 0) // Any data there?? return -1; if (s < 8) goto shortpacket; type = *((uint32_t *) p); p += sizeof(uint32_t); s -= sizeof(uint32_t); 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, 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). return cluster_catchup_slave(more, addr); case C_FORWARD: // Forwarded control packet. pass off to processudp. case C_FORWARD_DAE: // Forwarded DAE packet. pass off to processdae. if (!config->cluster_iam_master) { LOG(0, 0, 0, "I'm not the master, but I got a C_FORWARD%s from %s?\n", type == C_FORWARD_DAE ? "_DAE" : "", fmtaddr(addr, 0)); return -1; } else { struct sockaddr_in a; uint16_t indexudp; a.sin_addr.s_addr = more; a.sin_port = (*(int *) p) & 0xFFFF; indexudp = ((*(int *) p) >> 16) & 0xFFFF; s -= sizeof(int); p += sizeof(int); LOG(4, 0, 0, "Got a forwarded %spacket... (%s:%d)\n", type == C_FORWARD_DAE ? "DAE " : "", fmtaddr(more, 0), a.sin_port); STAT(recv_forward); if (type == C_FORWARD_DAE) { struct in_addr local; local.s_addr = config->bind_address ? config->bind_address : my_address; processdae(p, s, &a, sizeof(a), &local); } else processudp(p, s, &a, indexudp); return 0; } case C_PPPOE_FORWARD: if (!config->cluster_iam_master) { LOG(0, 0, 0, "I'm not the master, but I got a C_PPPOE_FORWARD from %s?\n", fmtaddr(addr, 0)); return -1; } else { pppoe_process_forward(p, s, addr); return 0; } case C_MPPP_FORWARD: // Receive a MPPP packet from a slave. if (!config->cluster_iam_master) { LOG(0, 0, 0, "I'm not the master, but I got a C_MPPP_FORWARD from %s?\n", fmtaddr(addr, 0)); return -1; } processipout(p, s); return 0; case C_THROTTLE: { // Receive a forwarded packet from a slave. if (!config->cluster_iam_master) { LOG(0, 0, 0, "I'm not the master, but I got a C_THROTTLE from %s?\n", fmtaddr(addr, 0)); return -1; } tbf_queue_packet(more, p, s); // The TBF id tells wether it goes in or out. return 0; } case C_GARDEN: // Receive a walled garden packet from a slave. if (!config->cluster_iam_master) { LOG(0, 0, 0, "I'm not the master, but I got a C_GARDEN from %s?\n", fmtaddr(addr, 0)); return -1; } tun_write(p, s); 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, "_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, "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, "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, "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, "Got a heartbeat from %s\n", fmtaddr(addr, 0)); return cluster_process_heartbeat(data, size, more, p, addr); default: LOG(0, 0, 0, "Strange type packet received on cluster socket (%d)\n", type); return -1; } return 0; shortpacket: LOG(0, 0, 0, "I got a _short_ cluster heartbeat packet! This means I'm probably out of sync!!\n"); return -1; } //==================================================================================================== int cmd_show_cluster(struct cli_def *cli, const char *command, char **argv, int argc) { int i; 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", 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, "UDP port : %u", config->cluster_port); cli_print(cli, "Multicast i'face : %s", config->cluster_interface); if (!config->cluster_iam_master) { cli_print(cli, "My master : %s (last heartbeat %.1f seconds old)", 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, "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 bundles undefined of %d", config->cluster_undefined_bundles, config->cluster_highest_bundleid); 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 bundle : %d", config->cluster_highest_bundleid); cli_print(cli, "Highest tunnel : %d", config->cluster_highest_tunnelid); cli_print(cli, "%d changes queued for sending", config->cluster_num_changes); } cli_print(cli, "%d peers.", num_peers); if (num_peers) cli_print(cli, "%20s %10s %8s", "Address", "Basetime", "Age"); for (i = 0; i < num_peers; ++i) { cli_print(cli, "%20s %10u %8d", fmtaddr(peers[i].peer, 0), peers[i].basetime, TIME - peers[i].timestamp); } return CLI_OK; } // // Simple run-length-encoding compression. // Format is // 1 byte < 128 = count of non-zero bytes following. // Not legal to be zero. // n non-zero bytes; // or // 1 byte > 128 = (count - 128) run of zero bytes. // // repeat. // count == 0 indicates end of compressed stream. // // Compress from 'src' into 'dst'. return number of bytes // used from 'dst'. // Updates *src_p to indicate 1 past last bytes used. // // We could get an extra byte in the zero runs by storing (count-1) // but I'm playing it safe. // // Worst case is a 50% expansion in space required (trying to // compress { 0x00, 0x01 } * N ) static int rle_compress(uint8_t **src_p, int ssize, uint8_t *dst, int dsize) { int count; int orig_dsize = dsize; uint8_t *x, *src; src = *src_p; while (ssize > 0 && dsize > 2) { count = 0; x = dst++; --dsize; // Reserve space for count byte.. if (*src) { // Copy a run of non-zero bytes. while (*src && count < 127 && ssize > 0 && dsize > 1) { // Count number of non-zero bytes. *dst++ = *src++; --dsize; --ssize; ++count; } *x = count; // Store number of non-zero bytes. Guarenteed to be non-zero! } else { // Compress a run of zero bytes. while (*src == 0 && count < 127 && ssize > 0) { ++src; --ssize; ++count; } *x = count | 0x80 ; } } *dst++ = 0x0; // Add Stop byte. --dsize; *src_p = src; return (orig_dsize - dsize); } // // Decompress the buffer into **p. // 'psize' is the size of the decompression buffer available. // // Returns the number of bytes decompressed. // // Decompresses from '*src_p' into 'dst'. // Return the number of dst bytes used. // Updates the 'src_p' pointer to point to the // first un-used byte. static int rle_decompress(uint8_t **src_p, int ssize, uint8_t *dst, int dsize) { int count; int orig_dsize = dsize; uint8_t *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. if (count == 0x0) // End marker reached? If so, finish. break; if (count & 0x80) { // Decompress a run of zeros for (count &= 0x7f ; count > 0 && dsize > 0; --count) { *dst++ = 0x0; --dsize; } } else { // Copy run of non-zero bytes. for ( ; count > 0 && ssize && dsize; --count) { // Copy non-zero bytes across. *dst++ = *src++; --ssize; --dsize; } } } *src_p = src; return (orig_dsize - dsize); }