X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet_packet.c;h=46fc875bf53c6869f564037339e8e76803035063;hp=3243670295d7cb747299488f24f96f20c46117f1;hb=8e717ddb602f01f656369106ec0398efbe9ca4a4;hpb=c11dc8079b60d9f8c5b1c7e8fecd90d0fac5a20c diff --git a/src/net_packet.c b/src/net_packet.c index 32436702..46fc875b 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) 1998-2005 Ivo Timmermans, - 2000-2009 Guus Sliepen + 2000-2011 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 @@ -26,8 +28,13 @@ #include #include +#ifdef HAVE_ZLIB #include +#endif + +#ifdef HAVE_LZO #include LZO1X_H +#endif #include "avl_tree.h" #include "conf.h" @@ -36,7 +43,6 @@ #include "ethernet.h" #include "event.h" #include "graph.h" -#include "list.h" #include "logger.h" #include "net.h" #include "netutl.h" @@ -46,24 +52,16 @@ #include "utils.h" #include "xalloc.h" -#ifdef HAVE_MINGW -#include -#define EMSGSIZE WSAEMSGSIZE -#define EAGAIN WSATRY_AGAIN -#define EINTR WSAEINTR -#define sockstrerror(x) winerror(x) -#define sockerrno WSAGetLastError() -#else -#define sockstrerror(x) strerror(x) -#define sockerrno errno -#endif - int keylifetime = 0; int keyexpires = 0; +#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 // mtuprobes == 1..30: initial discovery, send bursts with 1 second interval @@ -86,16 +84,21 @@ void send_mtu_probe(node_t *n) { } if(n->mtuprobes > 32) { + if(!n->minmtu) { + n->mtuprobes = 31; + timeout = pinginterval; + goto end; + } + 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) { + 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); - n->mtuprobes = 0; - return; + n->mtuprobes = 31; } if(n->mtuprobes == 30 || (n->mtuprobes < 30 && n->minmtu >= n->maxmtu)) { @@ -149,50 +152,76 @@ void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) { packet->data[0] = 1; send_udppacket(n, packet); } else { + if(n->mtuprobes > 30) { + if(n->minmtu) + n->mtuprobes = 30; + else + n->mtuprobes = 1; + } + 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 == 10) { + 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) { + 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; } @@ -276,25 +305,32 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { 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((n->received_seqno >= sizeof(n->late) * 8 && 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); - return; + 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[(i / 8) % replaywin] |= 1 << i % 8; } - } else { - for(i = n->received_seqno + 1; i < inpkt->seqno; i++) - n->late[(i / 8) % sizeof(n->late)] |= 1 << i % 8; } + + n->farfuture = 0; + n->late[(inpkt->seqno / 8) % replaywin] &= ~(1 << inpkt->seqno % 8); } - - n->late[(inpkt->seqno / 8) % sizeof(n->late)] &= ~(1 << inpkt->seqno % 8); if(inpkt->seqno > n->received_seqno) n->received_seqno = inpkt->seqno; @@ -328,7 +364,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { receive_packet(n, inpkt); } -void receive_tcppacket(connection_t *c, char *buffer, int len) { +void receive_tcppacket(connection_t *c, const char *buffer, int len) { vpn_packet_t outpkt; outpkt.len = len; @@ -349,9 +385,10 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { vpn_packet_t *outpkt; int origlen; int outlen, outpad; +#if defined(SOL_IP) && defined(IP_TOS) static int priority = 0; +#endif int origpriority; - int sock; if(!n->status.reachable) { ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname); @@ -365,10 +402,10 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { "No valid key known yet for %s (%s), forwarding via TCP", n->name, n->hostname); - if(!n->status.waitingforkey) + if(n->last_req_key + 10 <= now) { send_req_key(n); - - n->status.waitingforkey = true; + n->last_req_key = now; + } send_tcppacket(n->nexthop->connection, origpkt); @@ -438,27 +475,29 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { /* Determine which socket we have to use */ - for(sock = 0; sock < listen_sockets; sock++) - if(n->address.sa.sa_family == listen_socket[sock].sa.sa.sa_family) - break; - - if(sock >= listen_sockets) - sock = 0; /* If none is available, just use the first and hope for the best. */ + if(n->address.sa.sa_family != listen_socket[n->sock].sa.sa.sa_family) { + for(int sock = 0; sock < listen_sockets; sock++) { + if(n->address.sa.sa_family == listen_socket[sock].sa.sa.sa_family) { + n->sock = sock; + break; + } + } + } /* Send the packet */ #if defined(SOL_IP) && defined(IP_TOS) if(priorityinheritance && origpriority != priority - && listen_socket[sock].sa.sa.sa_family == AF_INET) { + && listen_socket[n->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 */ + 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)); } #endif - if((sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0) { - if(sockerrno == EMSGSIZE) { + if(sendto(listen_socket[n->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) @@ -480,7 +519,7 @@ void send_packet(const node_t *n, vpn_packet_t *packet) { if(n == myself) { if(overwrite_mac) memcpy(packet->data, mymac.x, ETH_ALEN); - write_packet(packet); + devops.write(packet); return; } @@ -536,20 +575,21 @@ static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) { avl_node_t *node; edge_t *e; node_t *n = NULL; + bool hard = false; static time_t last_hard_try = 0; for(node = edge_weight_tree->head; node; node = node->next) { e = node->data; + if(e->to == myself) + continue; + if(sockaddrcmp_noport(from, &e->address)) { if(last_hard_try == now) continue; - last_hard_try = now; + hard = true; } - if(!n) - n = e->to; - if(!try_mac(e->to, pkt)) continue; @@ -557,6 +597,9 @@ static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) { break; } + if(hard) + last_hard_try = now; + return n; } @@ -567,10 +610,10 @@ void handle_incoming_vpn_data(int sock) { socklen_t fromlen = sizeof(from); node_t *n; - pkt.len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen); + pkt.len = recvfrom(listen_socket[sock].udp, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen); if(pkt.len < 0) { - if(sockerrno != EAGAIN && sockerrno != EINTR) + if(!sockwouldblock(sockerrno)) logger(LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno)); return; } @@ -593,5 +636,7 @@ void handle_incoming_vpn_data(int sock) { return; } + n->sock = sock; + receive_udppacket(n, &pkt); }