Import Upstream version 1.0.12
This commit is contained in:
Guus Sliepen
parent
23bd9e9d53
commit
c54d214bf2
33 changed files with 751 additions and 271 deletions
95
src/route.c
95
src/route.c
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@ -1,7 +1,7 @@
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/*
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route.c -- routing
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Copyright (C) 2000-2005 Ivo Timmermans,
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2000-2009 Guus Sliepen <guus@tinc-vpn.org>
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2000-2010 Guus Sliepen <guus@tinc-vpn.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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@ -48,6 +48,7 @@ static const size_t ip6_size = sizeof(struct ip6_hdr);
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static const size_t icmp6_size = sizeof(struct icmp6_hdr);
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static const size_t ns_size = sizeof(struct nd_neighbor_solicit);
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static const size_t opt_size = sizeof(struct nd_opt_hdr);
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#define max(a, b) ((a) > (b) ? (a) : (b))
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/* RFC 1071 */
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@ -92,6 +93,74 @@ static bool checklength(node_t *source, vpn_packet_t *packet, length_t length) {
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return true;
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}
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static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *packet) {
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if(!via || via == myself || !(via->options & OPTION_CLAMP_MSS))
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return;
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/* Find TCP header */
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int start = 0;
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uint16_t type = packet->data[12] << 8 | packet->data[13];
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if(type == ETH_P_IP && packet->data[23] == 6)
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start = 14 + (packet->data[14] & 0xf) * 4;
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else if(type == ETH_P_IPV6 && packet->data[20] == 6)
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start = 14 + 40;
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if(!start || packet->len <= start + 20)
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return;
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/* Use data offset field to calculate length of options field */
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int len = ((packet->data[start + 12] >> 4) - 5) * 4;
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if(packet->len < start + 20 + len)
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return;
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/* Search for MSS option header */
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for(int i = 0; i < len;) {
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if(packet->data[start + 20 + i] == 0)
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break;
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if(packet->data[start + 20 + i] == 1) {
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i++;
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continue;
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}
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if(i > len - 2 || i > len - packet->data[start + 21 + i])
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break;
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if(packet->data[start + 20 + i] != 2) {
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if(packet->data[start + 21 + i] < 2)
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break;
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i += packet->data[start + 21 + i];
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continue;
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}
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if(packet->data[start + 21] != 4)
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break;
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/* Found it */
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uint16_t oldmss = packet->data[start + 22 + i] << 8 | packet->data[start + 23 + i];
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uint16_t newmss = via->mtu - start - 20;
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uint16_t csum = packet->data[start + 16] << 8 | packet->data[start + 17];
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if(oldmss <= newmss)
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break;
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ifdebug(TRAFFIC) logger(LOG_INFO, "Clamping MSS of packet from %s to %s to %d", source->name, via->name, newmss);
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/* Update the MSS value and the checksum */
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packet->data[start + 22 + i] = newmss >> 8;
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packet->data[start + 23 + i] = newmss & 0xff;
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csum ^= 0xffff;
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csum -= oldmss;
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csum += newmss;
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csum ^= 0xffff;
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packet->data[start + 16] = csum >> 8;
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packet->data[start + 17] = csum & 0xff;
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break;
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}
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}
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static void swap_mac_addresses(vpn_packet_t *packet) {
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mac_t tmp;
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memcpy(&tmp, &packet->data[0], sizeof tmp);
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@ -104,7 +173,7 @@ static void learn_mac(mac_t *address) {
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avl_node_t *node;
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connection_t *c;
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subnet = lookup_subnet_mac(address);
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subnet = lookup_subnet_mac(myself, address);
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/* If we don't know this MAC address yet, store it */
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@ -119,6 +188,7 @@ static void learn_mac(mac_t *address) {
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subnet->net.mac.address = *address;
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subnet->weight = 10;
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subnet_add(myself, subnet);
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subnet_update(myself, subnet, true);
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/* And tell all other tinc daemons it's our MAC */
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@ -154,6 +224,7 @@ void age_subnets(void) {
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send_del_subnet(c, s);
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}
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subnet_update(myself, s, false);
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subnet_del(myself, s);
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}
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}
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@ -315,10 +386,10 @@ static void route_ipv4_unicast(node_t *source, vpn_packet_t *packet) {
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via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via;
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if(via && packet->len > via->mtu && via != myself) {
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if(via && packet->len > max(via->mtu, 590) && via != myself) {
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ifdebug(TRAFFIC) logger(LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu);
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if(packet->data[20] & 0x40) {
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packet->len = via->mtu;
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packet->len = max(via->mtu, 590);
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route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED);
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} else {
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fragment_ipv4_packet(via, packet);
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@ -327,6 +398,8 @@ static void route_ipv4_unicast(node_t *source, vpn_packet_t *packet) {
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return;
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}
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clamp_mss(source, via, packet);
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send_packet(subnet->owner, packet);
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}
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@ -458,13 +531,15 @@ static void route_ipv6_unicast(node_t *source, vpn_packet_t *packet) {
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via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via;
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if(via && packet->len > via->mtu && via != myself) {
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if(via && packet->len > max(via->mtu, 1294) && via != myself) {
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ifdebug(TRAFFIC) logger(LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu);
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packet->len = via->mtu;
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packet->len = max(via->mtu, 1294);
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route_ipv6_unreachable(source, packet, ICMP6_PACKET_TOO_BIG, 0);
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return;
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}
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clamp_mss(source, via, packet);
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send_packet(subnet->owner, packet);
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}
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@ -705,7 +780,7 @@ static void route_mac(node_t *source, vpn_packet_t *packet) {
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/* Lookup destination address */
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memcpy(&dest, &packet->data[0], sizeof dest);
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subnet = lookup_subnet_mac(&dest);
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subnet = lookup_subnet_mac(NULL, &dest);
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if(!subnet) {
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broadcast_packet(source, packet);
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@ -724,7 +799,7 @@ static void route_mac(node_t *source, vpn_packet_t *packet) {
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if(via && packet->len > via->mtu && via != myself) {
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ifdebug(TRAFFIC) logger(LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu);
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uint16_t type = packet->data[12] << 8 | packet->data[13];
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if(type == ETH_P_IP) {
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if(type == ETH_P_IP && packet->len > 590) {
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if(packet->data[20] & 0x40) {
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packet->len = via->mtu;
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route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED);
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@ -732,13 +807,15 @@ static void route_mac(node_t *source, vpn_packet_t *packet) {
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fragment_ipv4_packet(via, packet);
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}
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return;
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} else if(type == ETH_P_IPV6) {
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} else if(type == ETH_P_IPV6 && packet->len > 1294) {
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packet->len = via->mtu;
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route_ipv6_unreachable(source, packet, ICMP6_PACKET_TOO_BIG, 0);
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return;
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}
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}
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clamp_mss(source, via, packet);
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send_packet(subnet->owner, packet);
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}
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