Import Upstream version 1.0.21
This commit is contained in:
Guus Sliepen
parent
d131e9a06f
commit
37abcfc1ea
38 changed files with 2387 additions and 11248 deletions
112
src/route.c
112
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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2000-2012 Guus Sliepen <guus@tinc-vpn.org>
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2000-2013 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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@ -110,15 +110,22 @@ static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *pac
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mtu = via->mtu;
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/* Find TCP header */
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int start = 0;
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int start = ether_size;
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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(type == ETH_P_8021Q) {
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start += 4;
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type = packet->data[16] << 8 | packet->data[17];
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}
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if(!start || packet->len <= start + 20)
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if(type == ETH_P_IP && packet->data[start + 9] == 6)
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start += (packet->data[start] & 0xf) * 4;
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else if(type == ETH_P_IPV6 && packet->data[start + 6] == 6)
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start += 40;
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else
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return;
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if(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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@ -244,7 +251,7 @@ void age_subnets(void) {
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/* RFC 792 */
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static void route_ipv4_unreachable(node_t *source, vpn_packet_t *packet, uint8_t type, uint8_t code) {
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static void route_ipv4_unreachable(node_t *source, vpn_packet_t *packet, length_t ether_size, uint8_t type, uint8_t code) {
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struct ip ip = {0};
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struct icmp icmp = {0};
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@ -317,7 +324,7 @@ static void route_ipv4_unreachable(node_t *source, vpn_packet_t *packet, uint8_t
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/* RFC 791 */
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static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet) {
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static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet, length_t ether_size) {
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struct ip ip;
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vpn_packet_t fragment;
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int len, maxlen, todo;
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@ -333,7 +340,7 @@ static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet) {
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todo = ntohs(ip.ip_len) - ip_size;
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if(ether_size + ip_size + todo != packet->len) {
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ifdebug(TRAFFIC) logger(LOG_WARNING, "Length of packet (%d) doesn't match length in IPv4 header (%zd)", packet->len, ether_size + ip_size + todo);
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ifdebug(TRAFFIC) logger(LOG_WARNING, "Length of packet (%d) doesn't match length in IPv4 header (%d)", packet->len, (int)(ether_size + ip_size + todo));
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return;
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}
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@ -381,7 +388,7 @@ static void route_ipv4_unicast(node_t *source, vpn_packet_t *packet) {
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dest.x[2],
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dest.x[3]);
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route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_UNKNOWN);
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route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_NET_UNKNOWN);
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return;
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}
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@ -391,10 +398,10 @@ static void route_ipv4_unicast(node_t *source, vpn_packet_t *packet) {
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}
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if(!subnet->owner->status.reachable)
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return route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_UNREACH);
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return route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_NET_UNREACH);
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if(forwarding_mode == FMODE_OFF && source != myself && subnet->owner != myself)
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return route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_ANO);
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return route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_NET_ANO);
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if(priorityinheritance)
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packet->priority = packet->data[15];
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@ -407,15 +414,15 @@ static void route_ipv4_unicast(node_t *source, vpn_packet_t *packet) {
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}
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if(directonly && subnet->owner != via)
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return route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_ANO);
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return route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_NET_ANO);
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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 = MAX(via->mtu, 590);
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route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED);
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route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED);
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} else {
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fragment_ipv4_packet(via, packet);
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fragment_ipv4_packet(via, packet, ether_size);
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}
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return;
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@ -442,7 +449,7 @@ static void route_ipv4(node_t *source, vpn_packet_t *packet) {
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/* RFC 2463 */
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static void route_ipv6_unreachable(node_t *source, vpn_packet_t *packet, uint8_t type, uint8_t code) {
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static void route_ipv6_unreachable(node_t *source, vpn_packet_t *packet, length_t ether_size, uint8_t type, uint8_t code) {
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struct ip6_hdr ip6;
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struct icmp6_hdr icmp6 = {0};
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uint16_t checksum;
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@ -540,7 +547,7 @@ static void route_ipv6_unicast(node_t *source, vpn_packet_t *packet) {
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ntohs(dest.x[6]),
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ntohs(dest.x[7]));
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route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADDR);
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route_ipv6_unreachable(source, packet, ether_size, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADDR);
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return;
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}
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@ -550,10 +557,10 @@ static void route_ipv6_unicast(node_t *source, vpn_packet_t *packet) {
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}
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if(!subnet->owner->status.reachable)
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return route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOROUTE);
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return route_ipv6_unreachable(source, packet, ether_size, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOROUTE);
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if(forwarding_mode == FMODE_OFF && source != myself && subnet->owner != myself)
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return route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADMIN);
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return route_ipv6_unreachable(source, packet, ether_size, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADMIN);
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via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via;
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@ -563,12 +570,12 @@ static void route_ipv6_unicast(node_t *source, vpn_packet_t *packet) {
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}
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if(directonly && subnet->owner != via)
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return route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADMIN);
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return route_ipv6_unreachable(source, packet, ether_size, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADMIN);
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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 = MAX(via->mtu, 1294);
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route_ipv6_unreachable(source, packet, ICMP6_PACKET_TOO_BIG, 0);
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route_ipv6_unreachable(source, packet, ether_size, ICMP6_PACKET_TOO_BIG, 0);
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return;
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}
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@ -829,6 +836,11 @@ static void route_mac(node_t *source, vpn_packet_t *packet) {
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if(forwarding_mode == FMODE_OFF && source != myself && subnet->owner != myself)
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return;
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uint16_t type = packet->data[12] << 8 | packet->data[13];
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if(priorityinheritance && type == ETH_P_IP && packet->len >= ether_size + ip_size)
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packet->priority = packet->data[15];
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// Handle packets larger than PMTU
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node_t *via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via;
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@ -838,18 +850,24 @@ 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 && packet->len > 590) {
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if(packet->data[20] & 0x40) {
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length_t ethlen = 14;
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if(type == ETH_P_8021Q) {
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type = packet->data[16] << 8 | packet->data[17];
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ethlen += 4;
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}
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if(type == ETH_P_IP && packet->len > 576 + ethlen) {
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if(packet->data[6 + ethlen] & 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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route_ipv4_unreachable(source, packet, ethlen, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED);
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} else {
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fragment_ipv4_packet(via, packet);
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fragment_ipv4_packet(via, packet, ethlen);
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}
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return;
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} else if(type == ETH_P_IPV6 && packet->len > 1294) {
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} else if(type == ETH_P_IPV6 && packet->len > 1280 + ethlen) {
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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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route_ipv6_unreachable(source, packet, ethlen, ICMP6_PACKET_TOO_BIG, 0);
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return;
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}
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}
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@ -861,42 +879,48 @@ static void route_mac(node_t *source, vpn_packet_t *packet) {
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static bool do_decrement_ttl(node_t *source, vpn_packet_t *packet) {
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uint16_t type = packet->data[12] << 8 | packet->data[13];
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length_t ethlen = ether_size;
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if(type == ETH_P_8021Q) {
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type = packet->data[16] << 8 | packet->data[17];
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ethlen += 4;
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}
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switch (type) {
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case ETH_P_IP:
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if(!checklength(source, packet, 14 + 32))
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if(!checklength(source, packet, ethlen + ip_size))
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return false;
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if(packet->data[22] < 1) {
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if(packet->data[25] != IPPROTO_ICMP || packet->data[46] != ICMP_TIME_EXCEEDED)
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route_ipv4_unreachable(source, packet, ICMP_TIME_EXCEEDED, ICMP_EXC_TTL);
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if(packet->data[ethlen + 8] < 1) {
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if(packet->data[ethlen + 11] != IPPROTO_ICMP || packet->data[ethlen + 32] != ICMP_TIME_EXCEEDED)
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route_ipv4_unreachable(source, packet, ethlen, ICMP_TIME_EXCEEDED, ICMP_EXC_TTL);
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return false;
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}
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uint16_t old = packet->data[22] << 8 | packet->data[23];
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packet->data[22]--;
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uint16_t new = packet->data[22] << 8 | packet->data[23];
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uint16_t old = packet->data[ethlen + 8] << 8 | packet->data[ethlen + 9];
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packet->data[ethlen + 8]--;
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uint16_t new = packet->data[ethlen + 8] << 8 | packet->data[ethlen + 9];
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uint32_t checksum = packet->data[24] << 8 | packet->data[25];
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uint32_t checksum = packet->data[ethlen + 10] << 8 | packet->data[ethlen + 11];
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checksum += old + (~new & 0xFFFF);
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while(checksum >> 16)
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checksum = (checksum & 0xFFFF) + (checksum >> 16);
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packet->data[24] = checksum >> 8;
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packet->data[25] = checksum & 0xff;
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packet->data[ethlen + 10] = checksum >> 8;
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packet->data[ethlen + 11] = checksum & 0xff;
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return true;
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case ETH_P_IPV6:
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if(!checklength(source, packet, 14 + 40))
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if(!checklength(source, packet, ethlen + ip6_size))
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return false;
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if(packet->data[21] < 1) {
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if(packet->data[20] != IPPROTO_ICMPV6 || packet->data[54] != ICMP6_TIME_EXCEEDED)
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route_ipv6_unreachable(source, packet, ICMP6_TIME_EXCEEDED, ICMP6_TIME_EXCEED_TRANSIT);
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if(packet->data[ethlen + 7] < 1) {
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if(packet->data[ethlen + 6] != IPPROTO_ICMPV6 || packet->data[ethlen + 40] != ICMP6_TIME_EXCEEDED)
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route_ipv6_unreachable(source, packet, ethlen, ICMP6_TIME_EXCEEDED, ICMP6_TIME_EXCEED_TRANSIT);
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return false;
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}
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packet->data[21]--;
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packet->data[ethlen + 7]--;
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return true;
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