X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet_packet.c;h=4e651555e4ccb88f8c8a56f00850ce88d25eaaec;hb=153abaa4d940bf2bc9bd7275d5efe5c01c354190;hp=64b0f8e8490adb7d5f0a06c2c99f6fcf39db2e64;hpb=36623e15a1c8685e5d8730345c1a7f9c93710fef;p=tinc diff --git a/src/net_packet.c b/src/net_packet.c index 64b0f8e8..4e651555 100644 --- a/src/net_packet.c +++ b/src/net_packet.c @@ -1,7 +1,7 @@ /* net_packet.c -- Handles in- and outgoing VPN packets Copyright (C) 1998-2005 Ivo Timmermans, - 2000-2011 Guus Sliepen + 2000-2012 Guus Sliepen 2010 Timothy Redaelli 2010 Brandon Black @@ -87,7 +87,7 @@ static void send_mtu_probe_handler(int fd, short events, void *data) { n->mtuprobes++; if(!n->status.reachable || !n->status.validkey) { - ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send MTU probe to unreachable or rekeying node %s (%s)", n->name, n->hostname); + logger(DEBUG_TRAFFIC, LOG_INFO, "Trying to send MTU probe to unreachable or rekeying node %s (%s)", n->name, n->hostname); n->mtuprobes = 0; return; } @@ -99,14 +99,14 @@ static void send_mtu_probe_handler(int fd, short events, void *data) { goto end; } - ifdebug(TRAFFIC) logger(LOG_INFO, "%s (%s) did not respond to UDP ping, restarting PMTU discovery", n->name, n->hostname); + logger(DEBUG_TRAFFIC, LOG_INFO, "%s (%s) did not respond to UDP ping, restarting PMTU discovery", n->name, n->hostname); n->mtuprobes = 1; n->minmtu = 0; n->maxmtu = MTU; } if(n->mtuprobes >= 10 && n->mtuprobes < 32 && !n->minmtu) { - ifdebug(TRAFFIC) logger(LOG_INFO, "No response to MTU probes from %s (%s)", n->name, n->hostname); + logger(DEBUG_TRAFFIC, LOG_INFO, "No response to MTU probes from %s (%s)", n->name, n->hostname); n->mtuprobes = 31; } @@ -116,7 +116,7 @@ static void send_mtu_probe_handler(int fd, short events, void *data) { else n->maxmtu = n->minmtu; n->mtu = n->minmtu; - ifdebug(TRAFFIC) logger(LOG_INFO, "Fixing MTU of %s (%s) to %d after %d probes", n->name, n->hostname, n->mtu, n->mtuprobes); + logger(DEBUG_TRAFFIC, LOG_INFO, "Fixing MTU of %s (%s) to %d after %d probes", n->name, n->hostname, n->mtu, n->mtuprobes); n->mtuprobes = 31; } @@ -139,9 +139,12 @@ static void send_mtu_probe_handler(int fd, short events, void *data) { memset(packet.data, 0, 14); randomize(packet.data + 14, len - 14); packet.len = len; - packet.priority = i < 3 ? 0 : -1; + if(i >= 3 && n->mtuprobes <= 10) + packet.priority = -1; + else + packet.priority = 0; - ifdebug(TRAFFIC) logger(LOG_INFO, "Sending MTU probe length %d to %s (%s)", len, n->name, n->hostname); + logger(DEBUG_TRAFFIC, LOG_INFO, "Sending MTU probe length %d to %s (%s)", len, n->name, n->hostname); send_udppacket(n, &packet); } @@ -157,7 +160,7 @@ void send_mtu_probe(node_t *n) { } static void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) { - ifdebug(TRAFFIC) logger(LOG_INFO, "Got MTU probe length %d from %s (%s)", packet->len, n->name, n->hostname); + logger(DEBUG_TRAFFIC, LOG_INFO, "Got MTU probe length %d from %s (%s)", packet->len, n->name, n->hostname); if(!packet->data[0]) { packet->data[0] = 1; @@ -239,7 +242,7 @@ static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t /* VPN packet I/O */ static void receive_packet(node_t *n, vpn_packet_t *packet) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, "Received packet of %d bytes from %s (%s)", + logger(DEBUG_TRAFFIC, LOG_DEBUG, "Received packet of %d bytes from %s (%s)", packet->len, n->name, n->hostname); n->in_packets++; @@ -262,8 +265,13 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { vpn_packet_t *outpkt = pkt[0]; size_t outlen; + if(experimental && OPTION_VERSION(n->options) >= 2) { + sptps_receive_data(&n->sptps, (char *)inpkt->data - 4, inpkt->len); + return; + } + if(!cipher_active(&n->incipher)) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet", + logger(DEBUG_TRAFFIC, LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet", n->name, n->hostname); return; } @@ -271,7 +279,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { /* Check packet length */ if(inpkt->len < sizeof inpkt->seqno + digest_length(&n->indigest)) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got too short packet from %s (%s)", + logger(DEBUG_TRAFFIC, LOG_DEBUG, "Got too short packet from %s (%s)", n->name, n->hostname); return; } @@ -281,7 +289,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { if(digest_active(&n->indigest)) { inpkt->len -= n->indigest.maclength; if(!digest_verify(&n->indigest, &inpkt->seqno, inpkt->len, (const char *)&inpkt->seqno + inpkt->len)) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got unauthenticated packet from %s (%s)", n->name, n->hostname); + logger(DEBUG_TRAFFIC, LOG_DEBUG, "Got unauthenticated packet from %s (%s)", n->name, n->hostname); return; } } @@ -292,7 +300,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { outlen = MAXSIZE; if(!cipher_decrypt(&n->incipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, "Error decrypting packet from %s (%s)", n->name, n->hostname); + logger(DEBUG_TRAFFIC, LOG_DEBUG, "Error decrypting packet from %s (%s)", n->name, n->hostname); return; } @@ -309,16 +317,16 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { if(inpkt->seqno != n->received_seqno + 1) { if(inpkt->seqno >= n->received_seqno + replaywin * 8) { if(n->farfuture++ < replaywin >> 2) { - logger(LOG_WARNING, "Packet from %s (%s) is %d seqs in the future, dropped (%u)", + logger(DEBUG_ALWAYS, LOG_WARNING, "Packet from %s (%s) is %d seqs in the future, dropped (%u)", n->name, n->hostname, inpkt->seqno - n->received_seqno - 1, n->farfuture); return; } - logger(LOG_WARNING, "Lost %d packets from %s (%s)", + logger(DEBUG_ALWAYS, LOG_WARNING, "Lost %d packets from %s (%s)", inpkt->seqno - n->received_seqno - 1, n->name, n->hostname); memset(n->late, 0, replaywin); } else if (inpkt->seqno <= n->received_seqno) { if((n->received_seqno >= replaywin * 8 && inpkt->seqno <= n->received_seqno - replaywin * 8) || !(n->late[(inpkt->seqno / 8) % replaywin] & (1 << inpkt->seqno % 8))) { - logger(LOG_WARNING, "Got late or replayed packet from %s (%s), seqno %d, last received %d", + logger(DEBUG_ALWAYS, LOG_WARNING, "Got late or replayed packet from %s (%s), seqno %d, last received %d", n->name, n->hostname, inpkt->seqno, n->received_seqno); return; } @@ -346,7 +354,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { outpkt = pkt[nextpkt++]; if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, n->incompression)) < 0) { - ifdebug(TRAFFIC) logger(LOG_ERR, "Error while uncompressing packet from %s (%s)", + logger(DEBUG_TRAFFIC, LOG_ERR, "Error while uncompressing packet from %s (%s)", n->name, n->hostname); return; } @@ -387,11 +395,11 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { size_t outlen; #if defined(SOL_IP) && defined(IP_TOS) static int priority = 0; - int origpriority = origpkt->priority; #endif + int origpriority = origpkt->priority; if(!n->status.reachable) { - ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname); + logger(DEBUG_TRAFFIC, LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname); return; } @@ -400,7 +408,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { if(!n->status.validkey) { time_t now = time(NULL); - ifdebug(TRAFFIC) logger(LOG_INFO, + logger(DEBUG_TRAFFIC, LOG_INFO, "No valid key known yet for %s (%s), forwarding via TCP", n->name, n->hostname); @@ -415,7 +423,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { } if(n->options & OPTION_PMTU_DISCOVERY && inpkt->len > n->minmtu && (inpkt->data[12] | inpkt->data[13])) { - ifdebug(TRAFFIC) logger(LOG_INFO, + logger(DEBUG_TRAFFIC, LOG_INFO, "Packet for %s (%s) larger than minimum MTU, forwarding via %s", n->name, n->hostname, n != n->nexthop ? n->nexthop->name : "TCP"); @@ -427,13 +435,21 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { return; } + if(experimental && OPTION_VERSION(n->options) >= 2) { + uint8_t type = 0; + if(!(inpkt->data[12] | inpkt->data[13])) + type = PKT_PROBE; + sptps_send_record(&n->sptps, type, (char *)inpkt->data, inpkt->len); + return; + } + /* Compress the packet */ if(n->outcompression) { outpkt = pkt[nextpkt++]; if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->outcompression)) < 0) { - ifdebug(TRAFFIC) logger(LOG_ERR, "Error while compressing packet to %s (%s)", + logger(DEBUG_TRAFFIC, LOG_ERR, "Error while compressing packet to %s (%s)", n->name, n->hostname); return; } @@ -453,7 +469,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { outlen = MAXSIZE; if(!cipher_encrypt(&n->outcipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) { - ifdebug(TRAFFIC) logger(LOG_ERR, "Error while encrypting packet to %s (%s)", n->name, n->hostname); + logger(DEBUG_TRAFFIC, LOG_ERR, "Error while encrypting packet to %s (%s)", n->name, n->hostname); goto end; } @@ -508,9 +524,9 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { if(priorityinheritance && origpriority != priority && listen_socket[n->sock].sa.sa.sa_family == AF_INET) { priority = origpriority; - ifdebug(TRAFFIC) logger(LOG_DEBUG, "Setting outgoing packet priority to %d", priority); + logger(DEBUG_TRAFFIC, LOG_DEBUG, "Setting outgoing packet priority to %d", priority); if(setsockopt(listen_socket[n->sock].udp, SOL_IP, IP_TOS, &priority, sizeof(priority))) /* SO_PRIORITY doesn't seem to work */ - logger(LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno)); + logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno)); } #endif @@ -521,13 +537,82 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { if(n->mtu >= origlen) n->mtu = origlen - 1; } else - logger(LOG_ERR, "Error sending packet to %s (%s): %s", n->name, n->hostname, sockstrerror(sockerrno)); + logger(DEBUG_TRAFFIC, LOG_WARNING, "Error sending packet to %s (%s): %s", n->name, n->hostname, sockstrerror(sockerrno)); } end: origpkt->len = origlen; } +bool send_sptps_data(void *handle, uint8_t type, const char *data, size_t len) { + node_t *to = handle; + + if(type >= SPTPS_HANDSHAKE) { + char buf[len * 4 / 3 + 5]; + b64encode(data, buf, len); + if(!to->status.validkey) + return send_request(to->nexthop->connection, "%d %s %s %s -1 -1 -1 -1", ANS_KEY, myself->name, to->name, buf); + else + return send_request(to->nexthop->connection, "%d %s %s %d %s", REQ_KEY, myself->name, to->name, REQ_SPTPS, buf); + } + + /* Send the packet */ + + struct sockaddr *sa; + socklen_t sl; + int sock; + + sa = &(to->address.sa); + sl = SALEN(to->address.sa); + sock = to->sock; + + if(sendto(listen_socket[sock].udp, data, len, 0, sa, sl) < 0 && !sockwouldblock(sockerrno)) { + if(sockmsgsize(sockerrno)) { + if(to->maxmtu >= len) + to->maxmtu = len - 1; + if(to->mtu >= len) + to->mtu = len - 1; + } else { + logger(DEBUG_TRAFFIC, LOG_WARNING, "Error sending UDP SPTPS packet to %s (%s): %s", to->name, to->hostname, sockstrerror(sockerrno)); + return false; + } + } + + return true; +} + +bool receive_sptps_record(void *handle, uint8_t type, const char *data, uint16_t len) { + node_t *from = handle; + + if(type == SPTPS_HANDSHAKE) { + from->status.validkey = true; + logger(DEBUG_META, LOG_INFO, "SPTPS key exchange with %s (%s) succesful", from->name, from->hostname); + return true; + } + + if(len > MTU) { + logger(DEBUG_ALWAYS, LOG_ERR, "Packet from %s (%s) larger than maximum supported size (%d > %d)", from->name, from->hostname, len, MTU); + return false; + } + + vpn_packet_t inpkt; + inpkt.len = len; + memcpy(inpkt.data, data, len); + + if(type == PKT_PROBE) { + mtu_probe_h(from, &inpkt, len); + return true; + + } + if(type != 0) { + logger(DEBUG_ALWAYS, LOG_ERR, "Unexpected SPTPS record type %d len %d from %s (%s)", type, len, from->name, from->hostname); + return false; + } + + receive_packet(from, &inpkt); + return true; +} + /* send a packet to the given vpn ip. */ @@ -543,11 +628,11 @@ void send_packet(node_t *n, vpn_packet_t *packet) { return; } - ifdebug(TRAFFIC) logger(LOG_ERR, "Sending packet of %d bytes to %s (%s)", + logger(DEBUG_TRAFFIC, LOG_ERR, "Sending packet of %d bytes to %s (%s)", packet->len, n->name, n->hostname); if(!n->status.reachable) { - ifdebug(TRAFFIC) logger(LOG_INFO, "Node %s (%s) is not reachable", + logger(DEBUG_TRAFFIC, LOG_INFO, "Node %s (%s) is not reachable", n->name, n->hostname); return; } @@ -558,7 +643,7 @@ void send_packet(node_t *n, vpn_packet_t *packet) { via = (packet->priority == -1 || n->via == myself) ? n->nexthop : n->via; if(via != n) - ifdebug(TRAFFIC) logger(LOG_INFO, "Sending packet to %s via %s (%s)", + logger(DEBUG_TRAFFIC, LOG_INFO, "Sending packet to %s via %s (%s)", n->name, via->name, n->via->hostname); if(packet->priority == -1 || ((myself->options | via->options) & OPTION_TCPONLY)) { @@ -573,24 +658,50 @@ void send_packet(node_t *n, vpn_packet_t *packet) { void broadcast_packet(const node_t *from, vpn_packet_t *packet) { splay_node_t *node; connection_t *c; + node_t *n; + + // Always give ourself a copy of the packet. + if(from != myself) + send_packet(myself, packet); - ifdebug(TRAFFIC) logger(LOG_INFO, "Broadcasting packet of %d bytes from %s (%s)", + // In TunnelServer mode, do not forward broadcast packets. + // The MST might not be valid and create loops. + if(tunnelserver || broadcast_mode == BMODE_NONE) + return; + + logger(DEBUG_TRAFFIC, LOG_INFO, "Broadcasting packet of %d bytes from %s (%s)", packet->len, from->name, from->hostname); - if(from != myself) { - send_packet(myself, packet); + switch(broadcast_mode) { + // In MST mode, broadcast packets travel via the Minimum Spanning Tree. + // This guarantees all nodes receive the broadcast packet, and + // usually distributes the sending of broadcast packets over all nodes. + case BMODE_MST: + for(node = connection_tree->head; node; node = node->next) { + c = node->data; - // In TunnelServer mode, do not forward broadcast packets. - // The MST might not be valid and create loops. - if(tunnelserver) - return; - } + if(c->status.active && c->status.mst && c != from->nexthop->connection) + send_packet(c->node, packet); + } + break; + + // In direct mode, we send copies to each node we know of. + // However, this only reaches nodes that can be reached in a single hop. + // We don't have enough information to forward broadcast packets in this case. + case BMODE_DIRECT: + if(from != myself) + break; + + for(node = node_udp_tree->head; node; node = node->next) { + n = node->data; - for(node = connection_tree->head; node; node = node->next) { - c = node->data; + if(n->status.reachable && ((n->via == myself && n->nexthop == n) || n->via == n)) + send_packet(n, packet); + } + break; - if(c->status.active && c->status.mst && c != from->nexthop->connection) - send_packet(c->node, packet); + default: + break; } } @@ -640,7 +751,7 @@ void handle_incoming_vpn_data(int sock, short events, void *data) { if(len <= 0 || len > MAXSIZE) { if(!sockwouldblock(sockerrno)) - logger(LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno)); + logger(DEBUG_ALWAYS, LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno)); return; } @@ -654,9 +765,9 @@ void handle_incoming_vpn_data(int sock, short events, void *data) { n = try_harder(&from, &pkt); if(n) update_node_udp(n, &from); - else ifdebug(PROTOCOL) { + else if(debug_level >= DEBUG_PROTOCOL) { hostname = sockaddr2hostname(&from); - logger(LOG_WARNING, "Received UDP packet from unknown source %s", hostname); + logger(DEBUG_PROTOCOL, LOG_WARNING, "Received UDP packet from unknown source %s", hostname); free(hostname); return; }