X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Froute.c;h=0b2d22eb55ca0c3f189391252d6baedd786ac07b;hb=5989a29d7b53b25e8ed2f60bc3a0e089e423c02c;hp=87f08ce9e40d855f0633ea7ff08cb4f7eedc2b5c;hpb=469fa318bc817908af9a51e3a980ffc998fae6f2;p=tinc diff --git a/src/route.c b/src/route.c index 87f08ce9..0b2d22eb 100644 --- a/src/route.c +++ b/src/route.c @@ -1,7 +1,7 @@ /* route.c -- routing Copyright (C) 2000-2005 Ivo Timmermans, - 2000-2009 Guus Sliepen + 2000-2010 Guus Sliepen 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 @@ -20,12 +20,14 @@ #include "system.h" -#include "avl_tree.h" +#include "splay_tree.h" #include "connection.h" +#include "control_common.h" #include "ethernet.h" #include "ipv4.h" #include "ipv6.h" #include "logger.h" +#include "meta.h" #include "net.h" #include "protocol.h" #include "route.h" @@ -33,10 +35,13 @@ #include "utils.h" rmode_t routing_mode = RMODE_ROUTER; +fmode_t forwarding_mode = FMODE_INTERNAL; +bool directonly = false; bool priorityinheritance = false; int macexpire = 600; bool overwrite_mac = false; mac_t mymac = {{0xFE, 0xFD, 0, 0, 0, 0}}; +bool pcap = false; /* Sizes of various headers */ @@ -48,7 +53,12 @@ static const size_t ip6_size = sizeof(struct ip6_hdr); static const size_t icmp6_size = sizeof(struct icmp6_hdr); static const size_t ns_size = sizeof(struct nd_neighbor_solicit); static const size_t opt_size = sizeof(struct nd_opt_hdr); -#define max(a, b) ((a) > (b) ? (a) : (b)) + +#ifndef MAX +#define MAX(a, b) ((a) > (b) ? (a) : (b)) +#endif + +static struct event age_subnets_event; /* RFC 1071 */ @@ -73,6 +83,7 @@ static uint16_t inet_checksum(void *data, int len, uint16_t prevsum) { static bool ratelimit(int frequency) { static time_t lasttime = 0; static int count = 0; + time_t now = time(NULL); if(lasttime == now) { if(++count > frequency) @@ -94,9 +105,13 @@ static bool checklength(node_t *source, vpn_packet_t *packet, length_t length) { } static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *packet) { - if(!via || via == myself || !(via->options & OPTION_CLAMP_MSS)) + if(!source || !via || !(via->options & OPTION_CLAMP_MSS)) return; + uint16_t mtu = source->mtu; + if(via != myself && via->mtu < mtu) + mtu = via->mtu; + /* Find TCP header */ int start = 0; uint16_t type = packet->data[12] << 8 | packet->data[13]; @@ -140,7 +155,7 @@ static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *pac /* Found it */ uint16_t oldmss = packet->data[start + 22 + i] << 8 | packet->data[start + 23 + i]; - uint16_t newmss = via->mtu - start - 20; + uint16_t newmss = mtu - start - 20; uint16_t csum = packet->data[start + 16] << 8 | packet->data[start + 17]; if(oldmss <= newmss) @@ -168,9 +183,43 @@ static void swap_mac_addresses(vpn_packet_t *packet) { memcpy(&packet->data[6], &tmp, sizeof tmp); } +static void age_subnets(int fd, short events, void *data) { + subnet_t *s; + connection_t *c; + splay_node_t *node, *next, *node2; + bool left = false; + time_t now = time(NULL); + + for(node = myself->subnet_tree->head; node; node = next) { + next = node->next; + s = node->data; + if(s->expires && s->expires < now) { + ifdebug(TRAFFIC) { + char netstr[MAXNETSTR]; + if(net2str(netstr, sizeof netstr, s)) + logger(LOG_INFO, "Subnet %s expired", netstr); + } + + for(node2 = connection_tree->head; node2; node2 = node2->next) { + c = node2->data; + if(c->status.active) + send_del_subnet(c, s); + } + + subnet_del(myself, s); + } else { + if(s->expires) + left = true; + } + } + + if(left) + event_add(&age_subnets_event, &(struct timeval){10, 0}); +} + static void learn_mac(mac_t *address) { subnet_t *subnet; - avl_node_t *node; + splay_node_t *node; connection_t *c; subnet = lookup_subnet_mac(myself, address); @@ -184,7 +233,7 @@ static void learn_mac(mac_t *address) { subnet = new_subnet(); subnet->type = SUBNET_MAC; - subnet->expires = now + macexpire; + subnet->expires = time(NULL) + macexpire; subnet->net.mac.address = *address; subnet->weight = 10; subnet_add(myself, subnet); @@ -197,36 +246,13 @@ static void learn_mac(mac_t *address) { if(c->status.active) send_add_subnet(c, subnet); } - } - - if(subnet->expires) - subnet->expires = now + macexpire; -} - -void age_subnets(void) { - subnet_t *s; - connection_t *c; - avl_node_t *node, *next, *node2; - for(node = myself->subnet_tree->head; node; node = next) { - next = node->next; - s = node->data; - if(s->expires && s->expires < now) { - ifdebug(TRAFFIC) { - char netstr[MAXNETSTR]; - if(net2str(netstr, sizeof netstr, s)) - logger(LOG_INFO, "Subnet %s expired", netstr); - } - - for(node2 = connection_tree->head; node2; node2 = node2->next) { - c = node2->data; - if(c->status.active) - send_del_subnet(c, s); - } - - subnet_update(myself, s, false); - subnet_del(myself, s); - } + if(!timeout_initialized(&age_subnets_event)) + timeout_set(&age_subnets_event, age_subnets, NULL); + event_add(&age_subnets_event, &(struct timeval){10, 0}); + } else { + if(subnet->expires) + subnet->expires = time(NULL) + macexpire; } } @@ -321,7 +347,7 @@ static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet) { todo = ntohs(ip.ip_len) - ip_size; if(ether_size + ip_size + todo != packet->len) { - ifdebug(TRAFFIC) logger(LOG_WARNING, "Length of packet (%d) doesn't match length in IPv4 header (%zd)", packet->len, ether_size + ip_size + todo); + 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)); return; } @@ -379,17 +405,23 @@ static void route_ipv4_unicast(node_t *source, vpn_packet_t *packet) { } if(!subnet->owner->status.reachable) - route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_UNREACH); + return route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_UNREACH); + + if(forwarding_mode == FMODE_OFF && source != myself && subnet->owner != myself) + return route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_ANO); if(priorityinheritance) packet->priority = packet->data[15]; via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via; - if(via && packet->len > max(via->mtu, 590) && via != myself) { + if(directonly && subnet->owner != via) + return route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_ANO); + + if(via && packet->len > MAX(via->mtu, 590) && via != myself) { 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); if(packet->data[20] & 0x40) { - packet->len = max(via->mtu, 590); + packet->len = MAX(via->mtu, 590); route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED); } else { fragment_ipv4_packet(via, packet); @@ -481,7 +513,7 @@ static void route_ipv6_unreachable(node_t *source, vpn_packet_t *packet, uint8_t /* Generate checksum */ - checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0); + checksum = inet_checksum(&pseudo, sizeof pseudo, ~0); checksum = inet_checksum(&icmp6, icmp6_size, checksum); checksum = inet_checksum(packet->data + ether_size + ip6_size + icmp6_size, ntohl(pseudo.length) - icmp6_size, checksum); @@ -527,13 +559,19 @@ static void route_ipv6_unicast(node_t *source, vpn_packet_t *packet) { } if(!subnet->owner->status.reachable) - route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOROUTE); + return route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOROUTE); + + if(forwarding_mode == FMODE_OFF && source != myself && subnet->owner != myself) + return route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADMIN); via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via; - if(via && packet->len > max(via->mtu, 1294) && via != myself) { + if(directonly && subnet->owner != via) + return route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADMIN); + + if(via && packet->len > MAX(via->mtu, 1294) && via != myself) { 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); - packet->len = max(via->mtu, 1294); + packet->len = MAX(via->mtu, 1294); route_ipv6_unreachable(source, packet, ICMP6_PACKET_TOO_BIG, 0); return; } @@ -602,7 +640,7 @@ static void route_neighborsol(node_t *source, vpn_packet_t *packet) { /* Generate checksum */ - checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0); + checksum = inet_checksum(&pseudo, sizeof pseudo, ~0); checksum = inet_checksum(&ns, ns_size, checksum); if(has_opt) { checksum = inet_checksum(&opt, opt_size, checksum); @@ -665,7 +703,7 @@ static void route_neighborsol(node_t *source, vpn_packet_t *packet) { /* Generate checksum */ - checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0); + checksum = inet_checksum(&pseudo, sizeof pseudo, ~0); checksum = inet_checksum(&ns, ns_size, checksum); if(has_opt) { checksum = inet_checksum(&opt, opt_size, checksum); @@ -726,7 +764,7 @@ static void route_arp(node_t *source, vpn_packet_t *packet) { /* Check if this is a valid ARP request */ if(ntohs(arp.arp_hrd) != ARPHRD_ETHER || ntohs(arp.arp_pro) != ETH_P_IP || - arp.arp_hln != ETH_ALEN || arp.arp_pln != sizeof(addr) || ntohs(arp.arp_op) != ARPOP_REQUEST) { + arp.arp_hln != ETH_ALEN || arp.arp_pln != sizeof addr || ntohs(arp.arp_op) != ARPOP_REQUEST) { ifdebug(TRAFFIC) logger(LOG_WARNING, "Cannot route packet: received unknown type ARP request"); return; } @@ -750,9 +788,9 @@ static void route_arp(node_t *source, vpn_packet_t *packet) { memcpy(packet->data, packet->data + ETH_ALEN, ETH_ALEN); /* copy destination address */ packet->data[ETH_ALEN * 2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */ - memcpy(&addr, arp.arp_tpa, sizeof(addr)); /* save protocol addr */ - memcpy(arp.arp_tpa, arp.arp_spa, sizeof(addr)); /* swap destination and source protocol address */ - memcpy(arp.arp_spa, &addr, sizeof(addr)); /* ... */ + memcpy(&addr, arp.arp_tpa, sizeof addr); /* save protocol addr */ + memcpy(arp.arp_tpa, arp.arp_spa, sizeof addr); /* swap destination and source protocol address */ + memcpy(arp.arp_spa, &addr, sizeof addr); /* ... */ memcpy(arp.arp_tha, arp.arp_sha, ETH_ALEN); /* set target hard/proto addr */ memcpy(arp.arp_sha, packet->data + ETH_ALEN, ETH_ALEN); /* add fake source hard addr */ @@ -792,9 +830,15 @@ static void route_mac(node_t *source, vpn_packet_t *packet) { return; } + if(forwarding_mode == FMODE_OFF && source != myself && subnet->owner != myself) + return; + // Handle packets larger than PMTU node_t *via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via; + + if(directonly && subnet->owner != via) + return; if(via && packet->len > via->mtu && via != myself) { 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); @@ -819,7 +863,28 @@ static void route_mac(node_t *source, vpn_packet_t *packet) { send_packet(subnet->owner, packet); } +static void send_pcap(vpn_packet_t *packet) { + pcap = false; + for(splay_node_t *node = connection_tree->head; node; node = node->next) { + connection_t *c = node->data; + if(!c->status.pcap) + continue; + else + pcap = true; + if(send_request(c, "%d %d %d", CONTROL, REQ_PCAP, packet->len)) + send_meta(c, (char *)packet->data, packet->len); + } +} + void route(node_t *source, vpn_packet_t *packet) { + if(pcap) + send_pcap(packet); + + if(forwarding_mode == FMODE_KERNEL && source != myself) { + send_packet(myself, packet); + return; + } + if(!checklength(source, packet, ether_size)) return;