X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet_packet.c;fp=src%2Fnet_packet.c;h=2a419cae117eb467c0311b26e418f80b67ca3c0a;hp=849c65acdd2ac71bf13d566bbe54b82b34083689;hb=3fae14fae5a347823679ef694ab630b4991a201d;hpb=985d19caf20058db3c764f0f6fbeafa8bcc59fcc diff --git a/src/net_packet.c b/src/net_packet.c index 849c65ac..2a419cae 100644 --- a/src/net_packet.c +++ b/src/net_packet.c @@ -85,7 +85,7 @@ void send_mtu_probe(node_t *n) { vpn_packet_t packet; int len, i; int timeout = 1; - + n->mtuprobes++; n->mtuevent = NULL; @@ -114,10 +114,12 @@ void send_mtu_probe(node_t *n) { } if(n->mtuprobes == 30 || (n->mtuprobes < 30 && n->minmtu >= n->maxmtu)) { - if(n->minmtu > n->maxmtu) + if(n->minmtu > n->maxmtu) { n->minmtu = n->maxmtu; - else + } 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); n->mtuprobes = 31; @@ -132,8 +134,10 @@ void send_mtu_probe(node_t *n) { for(i = 0; i < 4 + localdiscovery; i++) { if(i == 0) { - if(n->mtuprobes < 30 || n->maxmtu + 8 >= MTU) + if(n->mtuprobes < 30 || n->maxmtu + 8 >= MTU) { continue; + } + len = n->maxmtu + 8; } else if(n->maxmtu <= n->minmtu) { len = n->maxmtu; @@ -141,16 +145,19 @@ void send_mtu_probe(node_t *n) { len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu); } - if(len < 64) + if(len < 64) { len = 64; - + } + memset(packet.data, 0, 14); RAND_bytes(packet.data + 14, len - 14); packet.len = len; - if(i >= 4 && n->mtuprobes <= 10) + + if(i >= 4 && n->mtuprobes <= 10) { packet.priority = -1; - else + } else { packet.priority = 0; + } ifdebug(TRAFFIC) logger(LOG_INFO, "Sending MTU probe length %d to %s (%s)", len, n->name, n->hostname); @@ -173,23 +180,27 @@ void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) { send_udppacket(n, packet); } else { if(n->mtuprobes > 30) { - if (len == n->maxmtu + 8) { + if(len == n->maxmtu + 8) { ifdebug(TRAFFIC) logger(LOG_INFO, "Increase in PMTU to %s (%s) detected, restarting PMTU discovery", n->name, n->hostname); n->maxmtu = MTU; n->mtuprobes = 10; return; } - if(n->minmtu) + if(n->minmtu) { n->mtuprobes = 30; - else + } else { n->mtuprobes = 1; + } } - if(len > n->maxmtu) + if(len > n->maxmtu) { len = n->maxmtu; - if(n->minmtu < len) + } + + if(n->minmtu < len) { n->minmtu = len; + } } } @@ -208,9 +219,10 @@ static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t l } else if(level < 10) { #ifdef HAVE_ZLIB unsigned long destlen = MAXSIZE; - if(compress2(dest, &destlen, source, len, level) == Z_OK) + + if(compress2(dest, &destlen, source, len, level) == Z_OK) { return destlen; - else + } else #endif return -1; } else { @@ -222,7 +234,7 @@ static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t l return -1; #endif } - + return -1; } @@ -233,20 +245,25 @@ static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t } else if(level > 9) { #ifdef HAVE_LZO lzo_uint lzolen = MAXSIZE; - if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK) + + if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK) { return lzolen; - else + } else #endif return -1; } + #ifdef HAVE_ZLIB else { unsigned long destlen = MAXSIZE; - if(uncompress(dest, &destlen, source, len) == Z_OK) + + if(uncompress(dest, &destlen, source, len) == Z_OK) { return destlen; - else + } else { return -1; + } } + #endif return -1; @@ -256,7 +273,7 @@ static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t static void receive_packet(node_t *n, vpn_packet_t *packet) { ifdebug(TRAFFIC) logger(LOG_DEBUG, "Received packet of %d bytes from %s (%s)", - packet->len, n->name, n->hostname); + packet->len, n->name, n->hostname); route(n, packet); } @@ -264,8 +281,9 @@ static void receive_packet(node_t *n, vpn_packet_t *packet) { static bool try_mac(const node_t *n, const vpn_packet_t *inpkt) { unsigned char hmac[EVP_MAX_MD_SIZE]; - if(!n->indigest || !n->inmaclength || !n->inkey || inpkt->len < sizeof(inpkt->seqno) + n->inmaclength) + if(!n->indigest || !n->inmaclength || !n->inkey || inpkt->len < sizeof(inpkt->seqno) + n->inmaclength) { return false; + } HMAC(n->indigest, n->inkey, n->inkeylength, (unsigned char *) &inpkt->seqno, inpkt->len - n->inmaclength, (unsigned char *)hmac, NULL); @@ -283,7 +301,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { if(!n->inkey) { ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet", - n->name, n->hostname); + n->name, n->hostname); return; } @@ -291,7 +309,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { if(inpkt->len < sizeof(inpkt->seqno) + n->inmaclength) { ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got too short packet from %s (%s)", - n->name, n->hostname); + n->name, n->hostname); return; } @@ -300,11 +318,11 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { if(n->indigest && n->inmaclength) { inpkt->len -= n->inmaclength; HMAC(n->indigest, n->inkey, n->inkeylength, - (unsigned char *) &inpkt->seqno, inpkt->len, (unsigned char *)hmac, NULL); + (unsigned char *) &inpkt->seqno, inpkt->len, (unsigned char *)hmac, NULL); if(memcmp_constant_time(hmac, (char *) &inpkt->seqno + inpkt->len, n->inmaclength)) { ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got unauthenticated packet from %s (%s)", - n->name, n->hostname); + n->name, n->hostname); return; } } @@ -315,14 +333,14 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { outpkt = pkt[nextpkt++]; if(!EVP_DecryptInit_ex(n->inctx, NULL, NULL, NULL, NULL) - || !EVP_DecryptUpdate(n->inctx, (unsigned char *) &outpkt->seqno, &outlen, - (unsigned char *) &inpkt->seqno, inpkt->len) - || !EVP_DecryptFinal_ex(n->inctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) { + || !EVP_DecryptUpdate(n->inctx, (unsigned char *) &outpkt->seqno, &outlen, + (unsigned char *) &inpkt->seqno, inpkt->len) + || !EVP_DecryptFinal_ex(n->inctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) { ifdebug(TRAFFIC) logger(LOG_DEBUG, "Error decrypting packet from %s (%s): %s", - n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); + n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); return; } - + outpkt->len = outlen + outpad; inpkt = outpkt; } @@ -337,21 +355,23 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { if(inpkt->seqno >= n->received_seqno + replaywin * 8) { if(n->farfuture++ < replaywin >> 2) { ifdebug(TRAFFIC) logger(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); + n->name, n->hostname, inpkt->seqno - n->received_seqno - 1, n->farfuture); return; } + ifdebug(TRAFFIC) logger(LOG_WARNING, "Lost %d packets from %s (%s)", - inpkt->seqno - n->received_seqno - 1, n->name, n->hostname); + inpkt->seqno - n->received_seqno - 1, n->name, n->hostname); memset(n->late, 0, replaywin); - } else if (inpkt->seqno <= n->received_seqno) { + } 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))) { ifdebug(TRAFFIC) logger(LOG_WARNING, "Got late or replayed packet from %s (%s), seqno %d, last received %d", - n->name, n->hostname, inpkt->seqno, n->received_seqno); + n->name, n->hostname, inpkt->seqno, n->received_seqno); return; } } else { - for(i = n->received_seqno + 1; i < inpkt->seqno; i++) + for(i = n->received_seqno + 1; i < inpkt->seqno; i++) { n->late[(i / 8) % replaywin] |= 1 << i % 8; + } } } @@ -359,11 +379,13 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { n->late[(inpkt->seqno / 8) % replaywin] &= ~(1 << inpkt->seqno % 8); } - if(inpkt->seqno > n->received_seqno) + if(inpkt->seqno > n->received_seqno) { n->received_seqno = inpkt->seqno; - - if(n->received_seqno > MAX_SEQNO) + } + + if(n->received_seqno > MAX_SEQNO) { keyexpires = 0; + } /* Decompress the packet */ @@ -374,34 +396,39 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { 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)", - n->name, n->hostname); + n->name, n->hostname); return; } inpkt = outpkt; - origlen -= MTU/64 + 20; + origlen -= MTU / 64 + 20; } inpkt->priority = 0; - if(!inpkt->data[12] && !inpkt->data[13]) + if(!inpkt->data[12] && !inpkt->data[13]) { mtu_probe_h(n, inpkt, origlen); - else + } else { receive_packet(n, inpkt); + } } void receive_tcppacket(connection_t *c, const char *buffer, int len) { vpn_packet_t outpkt; - if(len > sizeof(outpkt.data)) + if(len > sizeof(outpkt.data)) { return; + } outpkt.len = len; - if(c->options & OPTION_TCPONLY) + + if(c->options & OPTION_TCPONLY) { outpkt.priority = 0; - else + } else { outpkt.priority = -1; + } + memcpy(outpkt.data, buffer, len); receive_packet(c->node, &outpkt); @@ -426,8 +453,8 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { if(!n->status.validkey) { ifdebug(TRAFFIC) logger(LOG_INFO, - "No valid key known yet for %s (%s), forwarding via TCP", - n->name, n->hostname); + "No valid key known yet for %s (%s), forwarding via TCP", + n->name, n->hostname); if(n->last_req_key + 10 <= now) { send_req_key(n); @@ -441,13 +468,14 @@ 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, - "Packet for %s (%s) larger than minimum MTU, forwarding via %s", - n->name, n->hostname, n != n->nexthop ? n->nexthop->name : "TCP"); + "Packet for %s (%s) larger than minimum MTU, forwarding via %s", + n->name, n->hostname, n != n->nexthop ? n->nexthop->name : "TCP"); - if(n != n->nexthop) + if(n != n->nexthop) { send_packet(n->nexthop, origpkt); - else + } else { send_tcppacket(n->nexthop->connection, origpkt); + } return; } @@ -462,7 +490,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { 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)", - n->name, n->hostname); + n->name, n->hostname); return; } @@ -480,11 +508,11 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { outpkt = pkt[nextpkt++]; if(!EVP_EncryptInit_ex(n->outctx, NULL, NULL, NULL, NULL) - || !EVP_EncryptUpdate(n->outctx, (unsigned char *) &outpkt->seqno, &outlen, - (unsigned char *) &inpkt->seqno, inpkt->len) - || !EVP_EncryptFinal_ex(n->outctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) { + || !EVP_EncryptUpdate(n->outctx, (unsigned char *) &outpkt->seqno, &outlen, + (unsigned char *) &inpkt->seqno, inpkt->len) + || !EVP_EncryptFinal_ex(n->outctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) { ifdebug(TRAFFIC) logger(LOG_ERR, "Error while encrypting packet to %s (%s): %s", - n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); + n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); goto end; } @@ -496,7 +524,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { if(n->outdigest && n->outmaclength) { HMAC(n->outdigest, n->outkey, n->outkeylength, (unsigned char *) &inpkt->seqno, - inpkt->len, (unsigned char *) &inpkt->seqno + inpkt->len, NULL); + inpkt->len, (unsigned char *) &inpkt->seqno + inpkt->len, NULL); inpkt->len += n->outmaclength; } @@ -523,6 +551,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { if(origpriority == -1 && n->prevedge) { sock = rand() % listen_sockets; memset(&broadcast, 0, sizeof(broadcast)); + if(listen_socket[sock].sa.sa.sa_family == AF_INET6) { broadcast.in6.sin6_family = AF_INET6; broadcast.in6.sin6_addr.s6_addr[0x0] = 0xff; @@ -535,11 +564,13 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { broadcast.in.sin_addr.s_addr = -1; broadcast.in.sin_port = n->prevedge->address.in.sin_port; } + sa = &broadcast.sa; sl = SALEN(broadcast.sa); } else { - if(origpriority == -1) + if(origpriority == -1) { origpriority = 0; + } sa = &(n->address.sa); sl = SALEN(n->address.sa); @@ -548,21 +579,31 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { if(priorityinheritance && origpriority != listen_socket[n->sock].priority) { listen_socket[n->sock].priority = origpriority; + switch(listen_socket[n->sock].sa.sa.sa_family) { #if defined(SOL_IP) && defined(IP_TOS) + case AF_INET: ifdebug(TRAFFIC) logger(LOG_DEBUG, "Setting IPv4 outgoing packet priority to %d", origpriority); - if(setsockopt(listen_socket[n->sock].udp, SOL_IP, IP_TOS, (void *)&origpriority, sizeof(origpriority))) /* SO_PRIORITY doesn't seem to work */ + + if(setsockopt(listen_socket[n->sock].udp, SOL_IP, IP_TOS, (void *)&origpriority, sizeof(origpriority))) { /* SO_PRIORITY doesn't seem to work */ logger(LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno)); + } + break; #endif #if defined(IPPROTO_IPV6) && defined(IPV6_TCLASS) + case AF_INET6: ifdebug(TRAFFIC) logger(LOG_DEBUG, "Setting IPv6 outgoing packet priority to %d", origpriority); - if(setsockopt(listen_socket[n->sock].udp, IPPROTO_IPV6, IPV6_TCLASS, (void *)&origpriority, sizeof(origpriority))) + + if(setsockopt(listen_socket[n->sock].udp, IPPROTO_IPV6, IPV6_TCLASS, (void *)&origpriority, sizeof(origpriority))) { logger(LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno)); + } + break; #endif + default: break; } @@ -570,12 +611,16 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { if(sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, sa, sl) < 0 && !sockwouldblock(sockerrno)) { if(sockmsgsize(sockerrno)) { - if(n->maxmtu >= origlen) + if(n->maxmtu >= origlen) { n->maxmtu = origlen - 1; - if(n->mtu >= origlen) + } + + if(n->mtu >= origlen) { n->mtu = origlen - 1; - } else + } + } else { ifdebug(TRAFFIC) logger(LOG_WARNING, "Error sending packet to %s (%s): %s", n->name, n->hostname, sockstrerror(sockerrno)); + } } end: @@ -589,18 +634,20 @@ void send_packet(const node_t *n, vpn_packet_t *packet) { node_t *via; if(n == myself) { - if(overwrite_mac) - memcpy(packet->data, mymac.x, ETH_ALEN); + if(overwrite_mac) { + memcpy(packet->data, mymac.x, ETH_ALEN); + } + devops.write(packet); return; } ifdebug(TRAFFIC) logger(LOG_ERR, "Sending packet of %d bytes to %s (%s)", - packet->len, n->name, n->hostname); + packet->len, n->name, n->hostname); if(!n->status.reachable) { ifdebug(TRAFFIC) logger(LOG_INFO, "Node %s (%s) is not reachable", - n->name, n->hostname); + n->name, n->hostname); return; } @@ -608,13 +655,15 @@ void send_packet(const node_t *n, vpn_packet_t *packet) { if(via != n) ifdebug(TRAFFIC) logger(LOG_INFO, "Sending packet to %s via %s (%s)", - n->name, via->name, n->via->hostname); + n->name, via->name, n->via->hostname); if(packet->priority == -1 || ((myself->options | via->options) & OPTION_TCPONLY)) { - if(!send_tcppacket(via->connection, packet)) + if(!send_tcppacket(via->connection, packet)) { terminate_connection(via->connection, true); - } else + } + } else { send_udppacket(via, packet); + } } /* Broadcast a packet using the minimum spanning tree */ @@ -625,47 +674,54 @@ void broadcast_packet(const node_t *from, vpn_packet_t *packet) { node_t *n; // Always give ourself a copy of the packet. - if(from != myself) + if(from != myself) { send_packet(myself, packet); + } // In TunnelServer mode, do not forward broadcast packets. - // The MST might not be valid and create loops. - if(tunnelserver || broadcast_mode == BMODE_NONE) + // The MST might not be valid and create loops. + if(tunnelserver || broadcast_mode == BMODE_NONE) { return; + } ifdebug(TRAFFIC) logger(LOG_INFO, "Broadcasting packet of %d bytes from %s (%s)", - packet->len, from->name, from->hostname); + packet->len, from->name, from->hostname); 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; - - if(c->status.active && c->status.mst && c != from->nexthop->connection) - send_packet(c->node, packet); + // 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; + + 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; + 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 = node_udp_tree->head; node; node = node->next) { + n = node->data; - if(n->status.reachable && n != myself && ((n->via == myself && n->nexthop == n) || n->via == n)) - send_packet(n, packet); + if(n->status.reachable && n != myself && ((n->via == myself && n->nexthop == n) || n->via == n)) { + send_packet(n, packet); } - break; + } - default: - break; + break; + + default: + break; } } @@ -678,14 +734,17 @@ static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) { for(node = edge_weight_tree->head; node; node = node->next) { e = node->data; - if(e->to == myself) + if(e->to == myself) { continue; + } - if(last_hard_try == now && sockaddrcmp_noport(from, &e->address)) + if(last_hard_try == now && sockaddrcmp_noport(from, &e->address)) { continue; + } - if(!try_mac(e->to, pkt)) + if(!try_mac(e->to, pkt)) { continue; + } n = e->to; break; @@ -705,27 +764,30 @@ void handle_incoming_vpn_data(int sock) { pkt.len = recvfrom(listen_socket[sock].udp, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen); if(pkt.len < 0) { - if(!sockwouldblock(sockerrno)) + if(!sockwouldblock(sockerrno)) { logger(LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno)); + } + return; } - sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */ + sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */ n = lookup_node_udp(&from); if(!n) { n = try_harder(&from, &pkt); - if(n) + + if(n) { update_node_udp(n, &from); - else ifdebug(PROTOCOL) { + } else ifdebug(PROTOCOL) { hostname = sockaddr2hostname(&from); logger(LOG_WARNING, "Received UDP packet from unknown source %s", hostname); free(hostname); return; - } - else + } else { return; + } } n->sock = sock;