X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet_packet.c;h=7bf12497f640dfd0f538e923ca8a52aadac80799;hp=28cf161e21e78e6c05c84835c572113800cc56bf;hb=cddcdc9af34afb388a8e4bdfff6882f568b98313;hpb=7fc69bc73b15349dafc193a50464caeb2f978369 diff --git a/src/net_packet.c b/src/net_packet.c index 28cf161e..7bf12497 100644 --- a/src/net_packet.c +++ b/src/net_packet.c @@ -13,11 +13,9 @@ 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. - - $Id$ + 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" @@ -60,29 +58,57 @@ static void send_udppacket(node_t *, vpn_packet_t *); #define MAX_SEQNO 1073741824 -void send_mtu_probe(node_t *n) -{ +// 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 + +void send_mtu_probe(node_t *n) { vpn_packet_t packet; int len, i; + int timeout = 1; - cp(); - n->mtuprobes++; n->mtuevent = NULL; + 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); + 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)) { + 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->mtuprobes >= 30 || n->minmtu >= n->maxmtu) { - 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); - return; - } + if(n->maxmtu <= n->minmtu) + len = n->maxmtu; + else + len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu); - len = n->minmtu + 1 + random() % (n->maxmtu - n->minmtu); if(len < 64) len = 64; @@ -91,32 +117,36 @@ void send_mtu_probe(node_t *n) packet.len = len; packet.priority = 0; - ifdebug(TRAFFIC) logger(LOG_INFO, _("Sending MTU probe length %d to %s (%s)"), len, n->name, n->hostname); + 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 = new_event(); n->mtuevent->handler = (event_handler_t)send_mtu_probe; n->mtuevent->data = n; - n->mtuevent->time = now + 1; + n->mtuevent->time = now + timeout; event_add(n->mtuevent); } 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); + 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_packet(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) -{ +static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) { if(level == 10) { lzo_uint lzolen = MAXSIZE; lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem); @@ -136,8 +166,7 @@ static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t l return -1; } -static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) -{ +static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) { if(level > 9) { lzo_uint lzolen = MAXSIZE; if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK) @@ -157,18 +186,14 @@ 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) -{ - 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(n, packet); } -static bool try_mac(const node_t *n, const vpn_packet_t *inpkt) -{ +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) @@ -179,8 +204,7 @@ static bool try_mac(const node_t *n, const vpn_packet_t *inpkt) return !memcmp(hmac, (char *) &inpkt->seqno + inpkt->len - n->inmaclength, n->inmaclength); } -static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) -{ +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; @@ -189,10 +213,8 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) unsigned char hmac[EVP_MAX_MD_SIZE]; int i; - cp(); - if(!n->inkey) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got packet from %s (%s) but he hasn't got our key yet"), + ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet", n->name, n->hostname); return; } @@ -200,7 +222,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) /* Check packet length */ if(inpkt->len < sizeof(inpkt->seqno) + n->inmaclength) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got too short packet from %s (%s)"), + ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got too short packet from %s (%s)", n->name, n->hostname); return; } @@ -213,7 +235,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) (unsigned char *) &inpkt->seqno, inpkt->len, (unsigned char *)hmac, NULL); if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, n->inmaclength)) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), + ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got unauthenticated packet from %s (%s)", n->name, n->hostname); return; } @@ -228,7 +250,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) || !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"), + ifdebug(TRAFFIC) logger(LOG_DEBUG, "Error decrypting packet from %s (%s): %s", n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); return; } @@ -244,13 +266,13 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) 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)"), + 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"), + 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; } @@ -276,7 +298,7 @@ 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)"), + ifdebug(TRAFFIC) logger(LOG_ERR, "Error while uncompressing packet from %s (%s)", n->name, n->hostname); return; } @@ -288,21 +310,15 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) inpkt->priority = 0; - if(n->connection) - n->connection->last_ping_time = now; - 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; @@ -313,8 +329,7 @@ void receive_tcppacket(connection_t *c, char *buffer, int len) receive_packet(c->node, &outpkt); } -static void send_udppacket(node_t *n, vpn_packet_t *origpkt) -{ +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; @@ -326,13 +341,16 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) 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) { ifdebug(TRAFFIC) logger(LOG_INFO, - _("No valid key known yet for %s (%s), forwarding via TCP"), + "No valid key known yet for %s (%s), forwarding via TCP", n->name, n->hostname); if(!n->status.waitingforkey) @@ -345,9 +363,9 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) return; } - if(n->options & OPTION_PMTU_DISCOVERY && !n->minmtu && (inpkt->data[12] | inpkt->data[13])) { + if(n->options & OPTION_PMTU_DISCOVERY && inpkt->len > n->minmtu && (inpkt->data[12] | inpkt->data[13])) { ifdebug(TRAFFIC) logger(LOG_INFO, - _("No minimum MTU established yet for %s (%s), forwarding via TCP"), + "Packet for %s (%s) larger than minimum MTU, forwarding via TCP", n->name, n->hostname); send_tcppacket(n->nexthop->connection, origpkt); @@ -364,7 +382,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) 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)"), + ifdebug(TRAFFIC) logger(LOG_ERR, "Error while compressing packet to %s (%s)", n->name, n->hostname); return; } @@ -386,7 +404,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) || !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"), + ifdebug(TRAFFIC) logger(LOG_ERR, "Error while encrypting packet to %s (%s): %s", n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); goto end; } @@ -418,9 +436,9 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) 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); + 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)); + logger(LOG_ERR, "System call `%s' failed: %s", "setsockopt", strerror(errno)); } #endif @@ -431,7 +449,7 @@ 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, strerror(errno)); + logger(LOG_ERR, "Error sending packet to %s (%s): %s", n->name, n->hostname, strerror(errno)); } end: @@ -441,12 +459,9 @@ end: /* 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(); - if(n == myself) { if(overwrite_mac) memcpy(packet->data, mymac.x, ETH_ALEN); @@ -454,11 +469,11 @@ void send_packet(const node_t *n, vpn_packet_t *packet) return; } - ifdebug(TRAFFIC) logger(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), + 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; } @@ -466,7 +481,7 @@ void send_packet(const 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)"), + ifdebug(TRAFFIC) logger(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)) { @@ -478,19 +493,22 @@ 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) -{ +void broadcast_packet(const node_t *from, vpn_packet_t *packet) { avl_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) + 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 = node->data; @@ -503,12 +521,16 @@ 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; + static time_t last_hard_try = 0; for(node = edge_weight_tree->head; node; node = node->next) { e = node->data; - if(sockaddrcmp_noport(from, &e->address)) - continue; + if(sockaddrcmp_noport(from, &e->address)) { + if(last_hard_try == now) + continue; + last_hard_try = now; + } if(!n) n = e->to; @@ -523,20 +545,18 @@ static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) { return n; } -void handle_incoming_vpn_data(int sock) -{ +void handle_incoming_vpn_data(int sock) { vpn_packet_t pkt; char *hostname; sockaddr_t from; socklen_t fromlen = sizeof(from); node_t *n; - cp(); - pkt.len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen); if(pkt.len < 0) { - logger(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno)); + if(errno != EAGAIN && errno != EINTR) + logger(LOG_ERR, "Receiving packet failed: %s", strerror(errno)); return; } @@ -550,7 +570,7 @@ void handle_incoming_vpn_data(int sock) update_node_udp(n, &from); else ifdebug(PROTOCOL) { hostname = sockaddr2hostname(&from); - logger(LOG_WARNING, _("Received UDP packet from unknown source %s"), hostname); + logger(LOG_WARNING, "Received UDP packet from unknown source %s", hostname); free(hostname); return; }