/*
route.c -- routing
- Copyright (C) 2000-2003 Ivo Timmermans <ivo@o2w.nl>,
- 2000-2003 Guus Sliepen <guus@sliepen.eu.org>
+ Copyright (C) 2000-2005 Ivo Timmermans,
+ 2000-2006 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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: route.c,v 1.1.2.75 2003/12/24 10:48:15 guus Exp $
+ $Id$
*/
#include "system.h"
-#ifdef HAVE_NET_ETHERNET_H
-#include <net/ethernet.h>
-#endif
-#ifdef HAVE_NET_IF_ARP_H
-#include <net/if_arp.h>
-#endif
-#ifdef HAVE_NETINET_IP_ICMP_H
-#include <netinet/ip_icmp.h>
-#endif
-#ifdef HAVE_NETINET_ICMP6_H
-#include <netinet/icmp6.h>
-#endif
-#ifdef HAVE_NETINET_IF_ETHER_H
-#include <netinet/if_ether.h>
-#endif
-
-#include "avl_tree.h"
+#include "splay_tree.h"
#include "connection.h"
#include "ethernet.h"
#include "ipv4.h"
static const size_t ns_size = sizeof(struct nd_neighbor_solicit);
static const size_t opt_size = sizeof(struct nd_opt_hdr);
+static struct event age_subnets_event;
+
/* RFC 1071 */
-static __inline__ uint16_t inet_checksum(void *data, int len, uint16_t prevsum)
+static uint16_t inet_checksum(void *data, int len, uint16_t prevsum)
{
uint16_t *p = data;
uint32_t checksum = prevsum ^ 0xFFFF;
return ~checksum;
}
-static __inline__ bool ratelimit(int frequency) {
+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)
return false;
}
-static __inline__ bool checklength(node_t *source, vpn_packet_t *packet, length_t length) {
+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);
return false;
return true;
}
-static __inline__ void learn_mac(mac_t *address)
+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);
+
+ cp();
+
+ 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;
cp();
subnet = new_subnet();
subnet->type = SUBNET_MAC;
- subnet->expires = now + macexpire;
+ subnet->expires = time(NULL) + macexpire;
subnet->net.mac.address = *address;
subnet_add(myself, subnet);
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;
-
- cp();
-
- 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);
- }
+ 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;
}
}
-static __inline__ void route_mac(node_t *source, vpn_packet_t *packet)
+static void route_mac(node_t *source, vpn_packet_t *packet)
{
subnet_t *subnet;
+ mac_t dest;
cp();
+
/* Learn source address */
- if(source == myself)
- learn_mac((mac_t *)(&packet->data[6]));
+ if(source == myself) {
+ mac_t src;
+ memcpy(&src, &packet->data[6], sizeof src);
+ learn_mac(&src);
+ }
/* Lookup destination address */
- subnet = lookup_subnet_mac((mac_t *)(&packet->data[0]));
+ memcpy(&dest, &packet->data[0], sizeof dest);
+ subnet = lookup_subnet_mac(&dest);
if(!subnet) {
broadcast_packet(source, packet);
/* RFC 791 */
-static __inline__ void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet) {
+static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet) {
struct ip ip;
vpn_packet_t fragment;
int len, maxlen, todo;
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 (%d)"), packet->len, ether_size + ip_size + todo);
+ ifdebug(TRAFFIC) logger(LOG_WARNING, _("Length of packet (%d) doesn't match length in IPv4 header (%zd)"), packet->len, ether_size + ip_size + todo);
return;
}
}
}
-static __inline__ void route_ipv4_unicast(node_t *source, vpn_packet_t *packet)
+static void route_ipv4_unicast(node_t *source, vpn_packet_t *packet)
{
subnet_t *subnet;
node_t *via;
+ ipv4_t dest;
cp();
- subnet = lookup_subnet_ipv4((ipv4_t *) &packet->data[30]);
+ memcpy(&dest, &packet->data[30], sizeof dest);
+ 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"),
source->name, source->hostname,
- packet->data[30],
- packet->data[31],
- packet->data[32],
- packet->data[33]);
+ dest.x[0],
+ dest.x[1],
+ dest.x[2],
+ dest.x[3]);
route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_UNKNOWN);
return;
via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via;
- if(packet->len > via->mtu && via != myself) {
+ 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);
if(packet->data[20] & 0x40) {
packet->len = via->mtu;
send_packet(subnet->owner, packet);
}
-static __inline__ void route_ipv4(node_t *source, vpn_packet_t *packet)
+static void route_ipv4(node_t *source, vpn_packet_t *packet)
{
cp();
/* 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);
send_packet(source, packet);
}
-static __inline__ void route_ipv6_unicast(node_t *source, vpn_packet_t *packet)
+static void route_ipv6_unicast(node_t *source, vpn_packet_t *packet)
{
subnet_t *subnet;
node_t *via;
+ ipv6_t dest;
cp();
- subnet = lookup_subnet_ipv6((ipv6_t *) &packet->data[38]);
+ memcpy(&dest, &packet->data[38], sizeof dest);
+ 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"),
source->name, source->hostname,
- ntohs(*(uint16_t *) &packet->data[38]),
- ntohs(*(uint16_t *) &packet->data[40]),
- ntohs(*(uint16_t *) &packet->data[42]),
- ntohs(*(uint16_t *) &packet->data[44]),
- ntohs(*(uint16_t *) &packet->data[46]),
- ntohs(*(uint16_t *) &packet->data[48]),
- ntohs(*(uint16_t *) &packet->data[50]),
- ntohs(*(uint16_t *) &packet->data[52]));
+ ntohs(dest.x[0]),
+ ntohs(dest.x[1]),
+ ntohs(dest.x[2]),
+ ntohs(dest.x[3]),
+ ntohs(dest.x[4]),
+ ntohs(dest.x[5]),
+ ntohs(dest.x[6]),
+ ntohs(dest.x[7]));
route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADDR);
return;
via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via;
- if(packet->len > via->mtu && via != myself) {
+ 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);
packet->len = via->mtu;
route_ipv6_unreachable(source, packet, ICMP6_PACKET_TOO_BIG, 0);
/* Generate checksum */
- checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0);
+ checksum = inet_checksum(&pseudo, sizeof pseudo, ~0);
checksum = inet_checksum(&ns, ns_size, checksum);
checksum = inet_checksum(&opt, opt_size, checksum);
checksum = inet_checksum(packet->data + ether_size + ip6_size + ns_size + opt_size, ETH_ALEN, checksum);
/* Generate checksum */
- checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0);
+ checksum = inet_checksum(&pseudo, sizeof pseudo, ~0);
checksum = inet_checksum(&ns, ns_size, checksum);
checksum = inet_checksum(&opt, opt_size, checksum);
checksum = inet_checksum(packet->data + ether_size + ip6_size + ns_size + opt_size, ETH_ALEN, checksum);
send_packet(source, packet);
}
-static __inline__ void route_ipv6(node_t *source, vpn_packet_t *packet)
+static void route_ipv6(node_t *source, vpn_packet_t *packet)
{
cp();
/* 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;
}
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 */