X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet_packet.c;h=a985390ca905ddbe70e737e94c97510b0208c1e1;hp=9635fafff15d1274f38fcab3901821e18d7fe084;hb=6834b882015a9323672e9fce8811aa4283f196f0;hpb=013a2e159e42c46808ea8d0b6abd57525db30a50 diff --git a/src/net_packet.c b/src/net_packet.c index 9635faff..a985390c 100644 --- a/src/net_packet.c +++ b/src/net_packet.c @@ -1,7 +1,9 @@ /* net_packet.c -- Handles in- and outgoing VPN packets - Copyright (C) 1998-2003 Ivo Timmermans , - 2000-2003 Guus Sliepen + Copyright (C) 1998-2005 Ivo Timmermans, + 2000-2010 Guus Sliepen + 2010 Timothy Redaelli + 2010 Brandon Black This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -13,28 +15,35 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - - $Id: net_packet.c,v 1.5 2003/08/24 20:38:24 guus Exp $ + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "system.h" #include +#include #include #include #include +#ifdef HAVE_ZLIB #include -#include +#endif + +#ifdef HAVE_LZO +#include LZO1X_H +#endif -#include "avl_tree.h" +#include "splay_tree.h" +#include "cipher.h" #include "conf.h" #include "connection.h" +#include "crypto.h" +#include "digest.h" #include "device.h" -#include "event.h" +#include "ethernet.h" #include "graph.h" #include "list.h" #include "logger.h" @@ -48,198 +57,357 @@ int keylifetime = 0; int keyexpires = 0; -EVP_CIPHER_CTX packet_ctx; +#ifdef HAVE_LZO static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS]; +#endif + +static void send_udppacket(node_t *, vpn_packet_t *); +unsigned replaywin = 16; #define MAX_SEQNO 1073741824 -static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) -{ - if(level == 10) { +// mtuprobes == 1..30: initial discovery, send bursts with 1 second interval +// mtuprobes == 31: sleep pinginterval seconds +// mtuprobes == 32: send 1 burst, sleep pingtimeout second +// mtuprobes == 33: no response from other side, restart PMTU discovery process + +static void send_mtu_probe_handler(void *data) { + node_t *n = data; + vpn_packet_t packet; + int len, i; + int timeout = 1; + + 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); + n->mtuprobes = 0; + return; + } + + if(n->mtuprobes > 32) { + ifdebug(TRAFFIC) logger(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->minmtu) { + ifdebug(TRAFFIC) logger(LOG_INFO, "No response to MTU probes from %s (%s)", n->name, n->hostname); + n->mtuprobes = 0; + return; + } + + if(n->mtuprobes == 30 || (n->mtuprobes < 30 && n->minmtu >= n->maxmtu)) { + if(n->minmtu > n->maxmtu) + n->minmtu = n->maxmtu; + 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; + } + + if(n->mtuprobes == 31) { + timeout = pinginterval; + goto end; + } else if(n->mtuprobes == 32) { + timeout = pingtimeout; + } + + for(i = 0; i < 3; i++) { + if(n->maxmtu <= n->minmtu) + len = n->maxmtu; + else + len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu); + + if(len < 64) + len = 64; + + memset(packet.data, 0, 14); + randomize(packet.data + 14, len - 14); + packet.len = len; + packet.priority = 0; + + ifdebug(TRAFFIC) logger(LOG_INFO, "Sending MTU probe length %d to %s (%s)", len, n->name, n->hostname); + + send_udppacket(n, &packet); + } + +end: + n->mtuevent.time = time(NULL) + timeout; + event_add(&n->mtuevent); +} + +void send_mtu_probe(node_t *n) { + event_del(&n->mtuevent); + n->mtuevent.handler = send_mtu_probe_handler; + n->mtuevent.data = n; + send_mtu_probe_handler(n); +} + +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); + + if(!packet->data[0]) { + packet->data[0] = 1; + send_udppacket(n, packet); + } else { + if(len > n->maxmtu) + len = n->maxmtu; + if(n->minmtu < len) + n->minmtu = len; + if(n->mtuprobes > 30) + n->mtuprobes = 30; + } +} + +static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) { + if(level == 0) { + memcpy(dest, source, len); + return len; + } else if(level == 10) { +#ifdef HAVE_LZO lzo_uint lzolen = MAXSIZE; lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem); return lzolen; +#else + return -1; +#endif } else if(level < 10) { +#ifdef HAVE_ZLIB unsigned long destlen = MAXSIZE; if(compress2(dest, &destlen, source, len, level) == Z_OK) return destlen; else +#endif return -1; } else { +#ifdef HAVE_LZO lzo_uint lzolen = MAXSIZE; lzo1x_999_compress(source, len, dest, &lzolen, lzo_wrkmem); return lzolen; +#else + return -1; +#endif } return -1; } -static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) -{ - if(level > 9) { +static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) { + if(level == 0) { + memcpy(dest, source, len); + return len; + } else if(level > 9) { +#ifdef HAVE_LZO lzo_uint lzolen = MAXSIZE; if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK) return lzolen; else +#endif return -1; - } else { + } +#ifdef HAVE_ZLIB + else { unsigned long destlen = MAXSIZE; if(uncompress(dest, &destlen, source, len) == Z_OK) return destlen; else return -1; } - +#endif + return -1; } /* VPN packet I/O */ -static void receive_packet(node_t *n, vpn_packet_t *packet) -{ - cp(); - - ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), +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); - route_incoming(n, packet); + route(n, packet); } -static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) -{ +static bool try_mac(node_t *n, const vpn_packet_t *inpkt) { + if(!digest_active(&n->indigest) || inpkt->len < sizeof inpkt->seqno + digest_length(&n->indigest)) + return false; + + return digest_verify(&n->indigest, &inpkt->seqno, inpkt->len - n->indigest.maclength, (const char *)&inpkt->seqno + inpkt->len - n->indigest.maclength); +} + +static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { vpn_packet_t pkt1, pkt2; vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 }; int nextpkt = 0; vpn_packet_t *outpkt = pkt[0]; - int outlen, outpad; - char hmac[EVP_MAX_MD_SIZE]; + size_t outlen; int i; - cp(); + if(!cipher_active(&n->incipher)) { + ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet", + n->name, n->hostname); + return; + } - /* Check the message authentication code */ + /* Check packet length */ - if(myself->digest && myself->maclength) { - inpkt->len -= myself->maclength; - HMAC(myself->digest, myself->key, myself->keylength, - (char *) &inpkt->seqno, inpkt->len, hmac, NULL); + if(inpkt->len < sizeof inpkt->seqno + digest_length(&n->indigest)) { + ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got too short packet from %s (%s)", + n->name, n->hostname); + return; + } + + /* Check the message authentication code */ - if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, myself->maclength)) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), - n->name, n->hostname); + 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); return; } } - /* Decrypt the packet */ - if(myself->cipher) { + if(cipher_active(&n->incipher)) { outpkt = pkt[nextpkt++]; + outlen = MAXSIZE; -// EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, -// myself->key + myself->cipher->key_len); - EVP_DecryptInit_ex(&packet_ctx, NULL, NULL, NULL, NULL); - EVP_DecryptUpdate(&packet_ctx, (char *) &outpkt->seqno, &outlen, - (char *) &inpkt->seqno, inpkt->len); - EVP_DecryptFinal_ex(&packet_ctx, (char *) &outpkt->seqno + outlen, &outpad); + 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); + return; + } - outpkt->len = outlen + outpad; + outpkt->len = outlen; inpkt = outpkt; } /* Check the sequence number */ - inpkt->len -= sizeof(inpkt->seqno); + inpkt->len -= sizeof inpkt->seqno; inpkt->seqno = ntohl(inpkt->seqno); - if(inpkt->seqno != n->received_seqno + 1) { - if(inpkt->seqno >= n->received_seqno + sizeof(n->late) * 8) { - logger(LOG_WARNING, _("Lost %d packets from %s (%s)"), - inpkt->seqno - n->received_seqno - 1, n->name, n->hostname); - - memset(n->late, 0, sizeof(n->late)); - } else if (inpkt->seqno <= n->received_seqno) { - if(inpkt->seqno <= n->received_seqno - sizeof(n->late) * 8 || !(n->late[(inpkt->seqno / 8) % sizeof(n->late)] & (1 << inpkt->seqno % 8))) { - 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); - } else + if(replaywin) { + 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)", + n->name, n->hostname, inpkt->seqno - n->received_seqno - 1, n->farfuture); + return; + } + logger(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", + n->name, n->hostname, inpkt->seqno, n->received_seqno); + return; + } + } else { for(i = n->received_seqno + 1; i < inpkt->seqno; i++) - n->late[(inpkt->seqno / 8) % sizeof(n->late)] |= 1 << i % 8; + n->late[(i / 8) % replaywin] |= 1 << i % 8; + } } + + n->farfuture = 0; + n->late[(inpkt->seqno / 8) % replaywin] &= ~(1 << inpkt->seqno % 8); } - - n->received_seqno = inpkt->seqno; - n->late[(n->received_seqno / 8) % sizeof(n->late)] &= ~(1 << n->received_seqno % 8); + + if(inpkt->seqno > n->received_seqno) + n->received_seqno = inpkt->seqno; if(n->received_seqno > MAX_SEQNO) - keyexpires = 0; + regenerate_key(); /* Decompress the packet */ - if(myself->compression) { + length_t origlen = inpkt->len; + + if(n->incompression) { outpkt = pkt[nextpkt++]; - if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, myself->compression)) < 0) { - logger(LOG_ERR, _("Error while uncompressing packet from %s (%s)"), - n->name, n->hostname); + 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); return; } inpkt = outpkt; + + origlen -= MTU/64 + 20; } - receive_packet(n, inpkt); + inpkt->priority = 0; + + if(!inpkt->data[12] && !inpkt->data[13]) + mtu_probe_h(n, inpkt, origlen); + else + receive_packet(n, inpkt); } -void receive_tcppacket(connection_t *c, char *buffer, int len) -{ +void receive_tcppacket(connection_t *c, char *buffer, int len) { vpn_packet_t outpkt; - cp(); - outpkt.len = len; + if(c->options & OPTION_TCPONLY) + outpkt.priority = 0; + else + outpkt.priority = -1; memcpy(outpkt.data, buffer, len); receive_packet(c->node, &outpkt); } -static void send_udppacket(node_t *n, vpn_packet_t *inpkt) -{ +static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { vpn_packet_t pkt1, pkt2; vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 }; + vpn_packet_t *inpkt = origpkt; int nextpkt = 0; vpn_packet_t *outpkt; int origlen; - int outlen, outpad; - vpn_packet_t *copy; + size_t outlen; +#if defined(SOL_IP) && defined(IP_TOS) static int priority = 0; +#endif int origpriority; int sock; - cp(); + if(!n->status.reachable) { + ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname); + return; + } /* Make sure we have a valid key */ if(!n->status.validkey) { + time_t now = time(NULL); + ifdebug(TRAFFIC) logger(LOG_INFO, - _("No valid key known yet for %s (%s), queueing packet"), + "No valid key known yet for %s (%s), forwarding via TCP", n->name, n->hostname); - /* Since packet is on the stack of handle_tap_input(), we have to make a copy of it first. */ - - copy = xmalloc(sizeof(vpn_packet_t)); - memcpy(copy, inpkt, sizeof(vpn_packet_t)); + if(n->last_req_key + 10 < now) { + send_req_key(n); + n->last_req_key = now; + } - list_insert_tail(n->queue, copy); + send_tcppacket(n->nexthop->connection, origpkt); - if(n->queue->count > MAXQUEUELENGTH) - list_delete_head(n->queue); + return; + } - if(!n->status.waitingforkey) - send_req_key(n->nexthop->connection, myself, n); + 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"); - n->status.waitingforkey = true; + if(n != n->nexthop) + send_packet(n->nexthop, origpkt); + else + send_tcppacket(n->nexthop->connection, origpkt); return; } @@ -249,11 +417,11 @@ static void send_udppacket(node_t *n, vpn_packet_t *inpkt) /* Compress the packet */ - if(n->compression) { + if(n->outcompression) { outpkt = pkt[nextpkt++]; - if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->compression)) < 0) { - logger(LOG_ERR, _("Error while compressing packet to %s (%s)"), + 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); return; } @@ -264,29 +432,28 @@ static void send_udppacket(node_t *n, vpn_packet_t *inpkt) /* Add sequence number */ inpkt->seqno = htonl(++(n->sent_seqno)); - inpkt->len += sizeof(inpkt->seqno); + inpkt->len += sizeof inpkt->seqno; /* Encrypt the packet */ - if(n->cipher) { + if(cipher_active(&n->outcipher)) { outpkt = pkt[nextpkt++]; + outlen = MAXSIZE; -// EVP_EncryptInit_ex(&packet_ctx, n->cipher, NULL, n->key, n->key + n->cipher->key_len); - EVP_EncryptInit_ex(&n->packet_ctx, NULL, NULL, NULL, NULL); - EVP_EncryptUpdate(&n->packet_ctx, (char *) &outpkt->seqno, &outlen, - (char *) &inpkt->seqno, inpkt->len); - EVP_EncryptFinal_ex(&n->packet_ctx, (char *) &outpkt->seqno + outlen, &outpad); + 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); + goto end; + } - outpkt->len = outlen + outpad; + outpkt->len = outlen; inpkt = outpkt; } /* Add the message authentication code */ - if(n->digest && n->maclength) { - HMAC(n->digest, n->key, n->keylength, (char *) &inpkt->seqno, - inpkt->len, (char *) &inpkt->seqno + inpkt->len, &outlen); - inpkt->len += n->maclength; + if(digest_active(&n->outdigest)) { + digest_create(&n->outdigest, &inpkt->seqno, inpkt->len, (char *)&inpkt->seqno + inpkt->len); + inpkt->len += digest_length(&n->outdigest); } /* Determine which socket we have to use */ @@ -304,50 +471,55 @@ static void send_udppacket(node_t *n, vpn_packet_t *inpkt) if(priorityinheritance && origpriority != priority && listen_socket[sock].sa.sa.sa_family == AF_INET) { priority = origpriority; - ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Setting outgoing packet priority to %d"), priority); - if(setsockopt(listen_socket[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)); + ifdebug(TRAFFIC) logger(LOG_DEBUG, "Setting outgoing packet priority to %d", priority); + if(setsockopt(listen_socket[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)); } #endif - if((sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0) { - logger(LOG_ERR, _("Error sending packet to %s (%s): %s"), n->name, n->hostname, strerror(errno)); - return; + if(sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa)) < 0 && !sockwouldblock(sockerrno)) { + if(sockmsgsize(sockerrno)) { + if(n->maxmtu >= origlen) + n->maxmtu = origlen - 1; + 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)); } - inpkt->len = origlen; +end: + origpkt->len = origlen; } /* send a packet to the given vpn ip. */ -void send_packet(const node_t *n, vpn_packet_t *packet) -{ +void send_packet(const node_t *n, vpn_packet_t *packet) { node_t *via; - cp(); - - ifdebug(TRAFFIC) logger(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), - packet->len, n->name, n->hostname); - if(n == myself) { - ifdebug(TRAFFIC) logger(LOG_NOTICE, _("Packet is looping back to us!")); + if(overwrite_mac) + memcpy(packet->data, mymac.x, ETH_ALEN); + write_packet(packet); return; } + ifdebug(TRAFFIC) logger(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"), + ifdebug(TRAFFIC) logger(LOG_INFO, "Node %s (%s) is not reachable", n->name, n->hostname); return; } - via = (n->via == myself) ? n->nexthop : n->via; + via = (packet->priority == -1 || n->via == myself) ? n->nexthop : n->via; if(via != n) - ifdebug(TRAFFIC) logger(LOG_ERR, _("Sending packet to %s via %s (%s)"), + ifdebug(TRAFFIC) logger(LOG_INFO, "Sending packet to %s via %s (%s)", n->name, via->name, n->via->hostname); - if((myself->options | via->options) & OPTION_TCPONLY) { + if(packet->priority == -1 || ((myself->options | via->options) & OPTION_TCPONLY)) { if(!send_tcppacket(via->connection, packet)) terminate_connection(via->connection, true); } else @@ -356,70 +528,103 @@ void send_packet(const node_t *n, vpn_packet_t *packet) /* Broadcast a packet using the minimum spanning tree */ -void broadcast_packet(const node_t *from, vpn_packet_t *packet) -{ - avl_node_t *node; +void broadcast_packet(const node_t *from, vpn_packet_t *packet) { + splay_node_t *node; connection_t *c; - cp(); - - ifdebug(TRAFFIC) logger(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"), + ifdebug(TRAFFIC) logger(LOG_INFO, "Broadcasting packet of %d bytes from %s (%s)", packet->len, from->name, from->hostname); + 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) + return; + } + for(node = connection_tree->head; node; node = node->next) { - c = (connection_t *) node->data; + c = node->data; if(c->status.active && c->status.mst && c != from->nexthop->connection) send_packet(c->node, packet); } } -void flush_queue(node_t *n) -{ - list_node_t *node, *next; +static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) { + splay_node_t *node; + node_t *n, *found = NULL; + static time_t last_hard_try = 0; + time_t now = time(NULL); + + if(last_hard_try == now) + return NULL; + else + last_hard_try = now; - cp(); + for(node = node_tree->head; node; node = node->next) { + n = node->data; - ifdebug(TRAFFIC) logger(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname); + if(n == myself || !n->status.reachable || !digest_active(&n->indigest)) + continue; - for(node = n->queue->head; node; node = next) { - next = node->next; - send_udppacket(n, (vpn_packet_t *) node->data); - list_delete_node(n->queue, node); + if(try_mac(n, pkt)) { + found = n; + break; + } } + + return found; } -void handle_incoming_vpn_data(int sock) -{ +void handle_incoming_vpn_data(void *arg) { + listen_socket_t *l = arg; vpn_packet_t pkt; char *hostname; sockaddr_t from; - socklen_t fromlen = sizeof(from); + socklen_t fromlen = sizeof from; node_t *n; + int len; - cp(); + while(true) { + len = recvfrom(l->udp, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen); - pkt.len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen); + if(len <= 0 || len > MAXSIZE) { + logger(LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno)); + return; + } - if(pkt.len <= 0) { - logger(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno)); - return; - } + pkt.len = len; - sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */ + sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */ - n = lookup_node_udp(&from); + mutex_lock(&mutex); + n = lookup_node_udp(&from); - if(!n) { - hostname = sockaddr2hostname(&from); - logger(LOG_WARNING, _("Received UDP packet from unknown source %s"), - hostname); - free(hostname); - return; + if(!n) { + n = try_harder(&from, &pkt); + if(n) + update_node_udp(n, &from); + } + + if(n) { + receive_udppacket(n, &pkt); + } else { + ifdebug(PROTOCOL) { + hostname = sockaddr2hostname(&from); + logger(LOG_WARNING, "Received UDP packet from unknown source %s", hostname); + free(hostname); + } + } + + mutex_unlock(&mutex); } +} - if(n->connection) - n->connection->last_ping_time = now; +void handle_device_data(int sock, short events, void *data) { + vpn_packet_t packet; - receive_udppacket(n, &pkt); + if(read_packet(&packet)) + route(myself, &packet); }