/*
route.c -- routing
Copyright (C) 2000-2005 Ivo Timmermans,
- 2000-2010 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2012 Guus Sliepen <guus@tinc-vpn.org>
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
#include "system.h"
-#include "splay_tree.h"
#include "connection.h"
#include "control_common.h"
#include "ethernet.h"
rmode_t routing_mode = RMODE_ROUTER;
fmode_t forwarding_mode = FMODE_INTERNAL;
+bmode_t broadcast_mode = BMODE_MST;
+bool decrement_ttl = false;
bool directonly = false;
bool priorityinheritance = false;
int macexpire = 600;
time_t now = time(NULL);
if(lasttime == now) {
- if(++count > frequency)
+ if(count >= frequency)
return true;
} else {
lasttime = now;
count = 0;
}
+ count++;
return false;
}
static bool checklength(node_t *source, vpn_packet_t *packet, length_t length) {
if(packet->len < length) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Got too short packet from %s (%s)", source->name, source->hostname);
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Got too short packet from %s (%s)", source->name, source->hostname);
return false;
} else
return true;
if(oldmss <= newmss)
break;
- ifdebug(TRAFFIC) logger(LOG_INFO, "Clamping MSS of packet from %s to %s to %d", source->name, via->name, newmss);
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Clamping MSS of packet from %s to %s to %d", source->name, via->name, newmss);
/* Update the MSS value and the checksum */
packet->data[start + 22 + i] = newmss >> 8;
}
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) {
+ for(splay_node_t *node = myself->subnet_tree->head, *next; node; node = next) {
next = node->next;
- s = node->data;
+ subnet_t *s = node->data;
if(s->expires && s->expires < now) {
- ifdebug(TRAFFIC) {
+ if(debug_level >= DEBUG_TRAFFIC) {
char netstr[MAXNETSTR];
if(net2str(netstr, sizeof netstr, s))
- logger(LOG_INFO, "Subnet %s expired", netstr);
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Subnet %s expired", netstr);
}
- for(node2 = connection_tree->head; node2; node2 = node2->next) {
- c = node2->data;
+ for(list_node_t *node = connection_list->head, *next; node; node = next) {
+ next = node->next;
+ connection_t *c = node->data;
if(c->status.active)
send_del_subnet(c, s);
}
}
static void learn_mac(mac_t *address) {
- subnet_t *subnet;
- splay_node_t *node;
- connection_t *c;
-
- subnet = lookup_subnet_mac(myself, address);
+ subnet_t *subnet = lookup_subnet_mac(myself, address);
/* If we don't know this MAC address yet, store it */
if(!subnet) {
- ifdebug(TRAFFIC) logger(LOG_INFO, "Learned new MAC address %hx:%hx:%hx:%hx:%hx:%hx",
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Learned new MAC address %hx:%hx:%hx:%hx:%hx:%hx",
address->x[0], address->x[1], address->x[2], address->x[3],
address->x[4], address->x[5]);
/* And tell all other tinc daemons it's our MAC */
- for(node = connection_tree->head; node; node = node->next) {
- c = node->data;
+ for(list_node_t *node = connection_list->head, *next; node; node = next) {
+ next = node->next;
+ connection_t *c = node->data;
if(c->status.active)
send_add_subnet(c, subnet);
}
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);
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Length of packet (%d) doesn't match length in IPv4 header (%d)", packet->len, (int)(ether_size + ip_size + todo));
return;
}
- ifdebug(TRAFFIC) logger(LOG_INFO, "Fragmenting packet of %d bytes to %s (%s)", packet->len, dest->name, dest->hostname);
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Fragmenting packet of %d bytes to %s (%s)", packet->len, dest->name, dest->hostname);
offset = packet->data + ether_size + ip_size;
maxlen = (dest->mtu - ether_size - ip_size) & ~0x7;
subnet = lookup_subnet_ipv4(&dest);
if(!subnet) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Cannot route packet from %s (%s): unknown IPv4 destination address %d.%d.%d.%d",
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet from %s (%s): unknown IPv4 destination address %d.%d.%d.%d",
source->name, source->hostname,
dest.x[0],
dest.x[1],
}
if(subnet->owner == source) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Packet looping back to %s (%s)!", source->name, source->hostname);
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Packet looping back to %s (%s)!", source->name, source->hostname);
return;
}
packet->priority = packet->data[15];
via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via;
+
+ if(via == source) {
+ logger(DEBUG_TRAFFIC, LOG_ERR, "Routing loop for packet from %s (%s)!", source->name, source->hostname);
+ return;
+ }
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);
+ logger(DEBUG_TRAFFIC, 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);
route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED);
if(!checklength(source, packet, ether_size + ip_size))
return;
- if(((packet->data[30] & 0xf0) == 0xe0) || (
+ if(broadcast_mode && (((packet->data[30] & 0xf0) == 0xe0) || (
packet->data[30] == 255 &&
packet->data[31] == 255 &&
packet->data[32] == 255 &&
- packet->data[33] == 255))
+ packet->data[33] == 255)))
broadcast_packet(source, packet);
else
route_ipv4_unicast(source, packet);
subnet = lookup_subnet_ipv6(&dest);
if(!subnet) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Cannot route packet from %s (%s): unknown IPv6 destination address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet from %s (%s): unknown IPv6 destination address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
source->name, source->hostname,
ntohs(dest.x[0]),
ntohs(dest.x[1]),
}
if(subnet->owner == source) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Packet looping back to %s (%s)!", source->name, source->hostname);
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Packet looping back to %s (%s)!", source->name, source->hostname);
return;
}
via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via;
+ if(via == source) {
+ logger(DEBUG_TRAFFIC, LOG_ERR, "Routing loop for packet from %s (%s)!", source->name, source->hostname);
+ return;
+ }
+
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);
+ logger(DEBUG_TRAFFIC, 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);
route_ipv6_unreachable(source, packet, ICMP6_PACKET_TOO_BIG, 0);
return;
has_opt = packet->len >= ether_size + ip6_size + ns_size + opt_size + ETH_ALEN;
if(source != myself) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Got neighbor solicitation request from %s (%s) while in router mode!", source->name, source->hostname);
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Got neighbor solicitation request from %s (%s) while in router mode!", source->name, source->hostname);
return;
}
if(ns.nd_ns_hdr.icmp6_type != ND_NEIGHBOR_SOLICIT ||
(has_opt && opt.nd_opt_type != ND_OPT_SOURCE_LINKADDR)) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Cannot route packet: received unknown type neighbor solicitation request");
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet: received unknown type neighbor solicitation request");
return;
}
}
if(checksum) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Cannot route packet: checksum error for neighbor solicitation request");
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet: checksum error for neighbor solicitation request");
return;
}
subnet = lookup_subnet_ipv6((ipv6_t *) &ns.nd_ns_target);
if(!subnet) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Cannot route packet: neighbor solicitation request for unknown address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet: neighbor solicitation request for unknown address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
ntohs(((uint16_t *) &ns.nd_ns_target)[0]),
ntohs(((uint16_t *) &ns.nd_ns_target)[1]),
ntohs(((uint16_t *) &ns.nd_ns_target)[2]),
return;
}
- if(packet->data[38] == 255)
+ if(broadcast_mode && packet->data[38] == 255)
broadcast_packet(source, packet);
else
route_ipv6_unicast(source, packet);
return;
if(source != myself) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Got ARP request from %s (%s) while in router mode!", source->name, source->hostname);
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Got ARP request from %s (%s) while in router mode!", source->name, source->hostname);
return;
}
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) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Cannot route packet: received unknown type ARP request");
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet: received unknown type ARP request");
return;
}
subnet = lookup_subnet_ipv4((ipv4_t *) &arp.arp_tpa);
if(!subnet) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Cannot route packet: ARP request for unknown address %d.%d.%d.%d",
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet: ARP request for unknown address %d.%d.%d.%d",
arp.arp_tpa[0], arp.arp_tpa[1], arp.arp_tpa[2],
arp.arp_tpa[3]);
return;
}
if(subnet->owner == source) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Packet looping back to %s (%s)!", source->name, source->hostname);
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Packet looping back to %s (%s)!", source->name, source->hostname);
return;
}
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);
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu);
uint16_t type = packet->data[12] << 8 | packet->data[13];
if(type == ETH_P_IP && packet->len > 590) {
if(packet->data[20] & 0x40) {
static void send_pcap(vpn_packet_t *packet) {
pcap = false;
- for(splay_node_t *node = connection_tree->head; node; node = node->next) {
+ for(list_node_t *node = connection_list->head, *next; node; node = next) {
+ next = 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);
+
+ pcap = true;
+ int len = packet->len;
+ if(c->outmaclength && c->outmaclength < len)
+ len = c->outmaclength;
+
+ if(send_request(c, "%d %d %d", CONTROL, REQ_PCAP, len))
+ send_meta(c, (char *)packet->data, len);
+ }
+}
+
+static bool do_decrement_ttl(node_t *source, vpn_packet_t *packet) {
+ uint16_t type = packet->data[12] << 8 | packet->data[13];
+
+ switch (type) {
+ case ETH_P_IP:
+ if(!checklength(source, packet, 14 + 32))
+ return false;
+
+ if(packet->data[22] < 1) {
+ if(packet->data[25] != IPPROTO_ICMP || packet->data[46] != ICMP_TIME_EXCEEDED)
+ route_ipv4_unreachable(source, packet, ICMP_TIME_EXCEEDED, ICMP_EXC_TTL);
+ return false;
+ }
+
+ uint16_t old = packet->data[22] << 8 | packet->data[23];
+ packet->data[22]--;
+ uint16_t new = packet->data[22] << 8 | packet->data[23];
+
+ uint32_t checksum = packet->data[24] << 8 | packet->data[25];
+ checksum += old + (~new & 0xFFFF);
+ while(checksum >> 16)
+ checksum = (checksum & 0xFFFF) + (checksum >> 16);
+ packet->data[24] = checksum >> 8;
+ packet->data[25] = checksum & 0xff;
+
+ return true;
+
+ case ETH_P_IPV6:
+ if(!checklength(source, packet, 14 + 40))
+ return false;
+
+ if(packet->data[21] < 1) {
+ if(packet->data[20] != IPPROTO_ICMPV6 || packet->data[54] != ICMP6_TIME_EXCEEDED)
+ route_ipv6_unreachable(source, packet, ICMP6_TIME_EXCEEDED, ICMP6_TIME_EXCEED_TRANSIT);
+ return false;
+ }
+
+ packet->data[21]--;
+
+ return true;
+
+ default:
+ return true;
}
}
if(!checklength(source, packet, ether_size))
return;
+ if(decrement_ttl && source != myself)
+ if(!do_decrement_ttl(source, packet))
+ return;
+
switch (routing_mode) {
case RMODE_ROUTER:
{
break;
default:
- ifdebug(TRAFFIC) logger(LOG_WARNING, "Cannot route packet from %s (%s): unknown type %hx", source->name, source->hostname, type);
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet from %s (%s): unknown type %hx", source->name, source->hostname, type);
break;
}
}
projects / tinc / blobdiff