/*
route.c -- routing
- Copyright (C) 2000,2001 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000,2001 Guus Sliepen <guus@sliepen.warande.net>
+ Copyright (C) 2000-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
+ 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
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 1.1.2.20 2001/10/27 13:13:35 guus Exp $
+ $Id: route.c,v 1.1.2.37 2002/03/19 00:08:23 guus Exp $
*/
#include "config.h"
-#ifdef HAVE_FREEBSD
+#if defined(HAVE_FREEBSD) || defined(HAVE_OPENBSD)
#include <sys/param.h>
#endif
#include <sys/socket.h>
#include <netinet/in.h>
-#ifdef HAVE_SOLARIS
+#if defined(HAVE_SOLARIS) || defined(HAVE_OPENBSD)
#include <net/if.h>
#define ETHER_ADDR_LEN 6
#else
#include <net/ethernet.h>
#endif
+#include <netinet/ip6.h>
+#include <netinet/icmp6.h>
#include <netinet/if_ether.h>
#include <utils.h>
#include <xalloc.h>
#include "system.h"
int routing_mode = RMODE_ROUTER;
+int priorityinheritance = 0;
+int macexpire = 600;
subnet_t mymac;
void learn_mac(mac_t *address)
if(!subnet || subnet->owner!=myself)
{
if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("Learned new MAC address %hhx:%hhx:%hhx:%hhx:%hhx:%hhx"),
+ syslog(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]);
subnet = new_subnet();
send_add_subnet(c, subnet);
}
}
+
+ subnet->net.mac.lastseen = now;
+}
+
+void age_mac(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 = (subnet_t *)node->data;
+ if(s->type == SUBNET_MAC && s->net.mac.lastseen && s->net.mac.lastseen + macexpire < now)
+ {
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_INFO, _("MAC address %hx:%hx:%hx:%hx:%hx:%hx expired"),
+ s->net.mac.address.x[0], s->net.mac.address.x[1], s->net.mac.address.x[2], s->net.mac.address.x[3], s->net.mac.address.x[4], s->net.mac.address.x[5]);
+ for(node2 = connection_tree->head; node2; node2 = node2->next)
+ {
+ c = (connection_t *)node2->data;
+ if(c->status.active)
+ send_del_subnet(c, s);
+ }
+ subnet_del(myself, s);
+ }
+ }
+cp
}
node_t *route_mac(vpn_packet_t *packet)
node_t *route_ipv4(vpn_packet_t *packet)
{
- ipv4_t dest;
subnet_t *subnet;
cp
-#ifdef HAVE_SOLARIS
- /* The other form gives bus errors on a SparcStation 20. */
- dest = ((packet->data[30] * 0x100 + packet->data[31]) * 0x100 + packet->data[32]) * 0x100 + packet->data[33];
-#else
- dest = ntohl(*((unsigned long*)(&packet->data[30])));
-#endif
-cp
- subnet = lookup_subnet_ipv4(&dest);
+ if(priorityinheritance)
+ packet->priority = packet->data[15];
+
+ subnet = lookup_subnet_ipv4((ipv4_t *)&packet->data[30]);
cp
if(!subnet)
{
if(debug_lvl >= DEBUG_TRAFFIC)
{
- syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %d.%d.%d.%d"),
+ syslog(LOG_WARNING, _("Cannot route packet: unknown IPv4 destination address %d.%d.%d.%d"),
packet->data[30], packet->data[31], packet->data[32], packet->data[33]);
}
node_t *route_ipv6(vpn_packet_t *packet)
{
- ipv6_t dest;
subnet_t *subnet;
cp
- memcpy(&dest, &packet->data[30], sizeof(ipv6_t));
-
- subnet = lookup_subnet_ipv6(&dest);
+ subnet = lookup_subnet_ipv6((ipv6_t *)&packet->data[38]);
cp
if(!subnet)
{
if(debug_lvl >= DEBUG_TRAFFIC)
{
- syslog(LOG_WARNING, _("Cannot route packet: unknown IPv6 destination address"));
+ syslog(LOG_WARNING, _("Cannot route packet: unknown IPv6 destination address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"),
+ ntohs(*(short unsigned int *)&packet->data[38]),
+ ntohs(*(short unsigned int *)&packet->data[40]),
+ ntohs(*(short unsigned int *)&packet->data[42]),
+ ntohs(*(short unsigned int *)&packet->data[44]),
+ ntohs(*(short unsigned int *)&packet->data[46]),
+ ntohs(*(short unsigned int *)&packet->data[48]),
+ ntohs(*(short unsigned int *)&packet->data[50]),
+ ntohs(*(short unsigned int *)&packet->data[52]));
}
return NULL;
return subnet->owner;
}
+unsigned short int inet_checksum(unsigned short int *data, int len, unsigned short int prevsum)
+{
+ unsigned long int checksum = prevsum ^ 0xFFFF;
+
+ while(len--)
+ checksum += ntohs(*data++);
+
+ while(checksum >> 16)
+ checksum = (checksum & 0xFFFF) + (checksum >> 16);
+
+ return checksum ^ 0xFFFF;
+}
+
+void route_neighborsol(vpn_packet_t *packet)
+{
+ struct ip6_hdr *hdr;
+ struct nd_neighbor_solicit *ns;
+ struct nd_opt_hdr *opt;
+ subnet_t *subnet;
+ short unsigned int checksum;
+
+ struct {
+ struct in6_addr ip6_src; /* source address */
+ struct in6_addr ip6_dst; /* destination address */
+ uint32_t length;
+ uint8_t junk[4];
+ } pseudo;
+
+cp
+ hdr = (struct ip6_hdr *)(packet->data + 14);
+ ns = (struct nd_neighbor_solicit *)(packet->data + 14 + sizeof(*hdr));
+ opt = (struct nd_opt_hdr *)(packet->data + 14 + sizeof(*hdr) + sizeof(*ns));
+
+ /* First, snatch the source address from the neighbor solicitation packet */
+
+ memcpy(mymac.net.mac.address.x, packet->data + 6, 6);
+
+ /* Check if this is a valid neighbor solicitation request */
+
+ if(ns->nd_ns_hdr.icmp6_type != ND_NEIGHBOR_SOLICIT ||
+ opt->nd_opt_type != ND_OPT_SOURCE_LINKADDR)
+ {
+ if(debug_lvl > DEBUG_TRAFFIC)
+ {
+ syslog(LOG_WARNING, _("Cannot route packet: received unknown type neighbor solicitation request"));
+ }
+ return;
+ }
+
+ /* Create pseudo header */
+
+ memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16);
+ memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16);
+ pseudo.length = htonl(sizeof(*ns) + sizeof(*opt) + 6);
+ pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0;
+ pseudo.junk[3] = IPPROTO_ICMPV6;
+
+ /* Generate checksum */
+
+ checksum = inet_checksum((unsigned short int *)&pseudo, sizeof(pseudo)/2, ~0);
+ checksum = inet_checksum((unsigned short int *)ns, sizeof(*ns)/2 + 4, checksum);
+
+ if(checksum)
+ {
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_WARNING, _("Cannot route packet: checksum error for neighbor solicitation request"));
+ return;
+ }
+
+ /* Check if the IPv6 address exists on the VPN */
+
+ subnet = lookup_subnet_ipv6((ipv6_t *)&ns->nd_ns_target);
+
+ if(!subnet)
+ {
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ {
+ syslog(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]), ntohs(((uint16_t *)&ns->nd_ns_target)[3]),
+ ntohs(((uint16_t *)&ns->nd_ns_target)[4]), ntohs(((uint16_t *)&ns->nd_ns_target)[5]), ntohs(((uint16_t *)&ns->nd_ns_target)[6]), ntohs(((uint16_t *)&ns->nd_ns_target)[7]));
+ }
+
+ return;
+ }
+
+ /* Check if it is for our own subnet */
+
+ if(subnet->owner == myself)
+ return; /* silently ignore */
+
+ /* Create neighbor advertation reply */
+
+ memcpy(packet->data, packet->data + ETHER_ADDR_LEN, ETHER_ADDR_LEN); /* copy destination address */
+ packet->data[ETHER_ADDR_LEN*2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */
+
+ memcpy(&hdr->ip6_dst, &hdr->ip6_src, 16); /* swap destination and source protocol address */
+ memcpy(&hdr->ip6_src, &ns->nd_ns_target, 16); /* ... */
+
+ memcpy((char *)opt + sizeof(*opt), packet->data + ETHER_ADDR_LEN, 6); /* add fake source hard addr */
+
+ ns->nd_ns_hdr.icmp6_cksum = 0;
+ ns->nd_ns_hdr.icmp6_type = ND_NEIGHBOR_ADVERT;
+ ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[0] = 0x40; /* Set solicited flag */
+ ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[1] = ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[2] = ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[3] = 0;
+ opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
+
+ /* Create pseudo header */
+
+ memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16);
+ memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16);
+ pseudo.length = htonl(sizeof(*ns) + sizeof(*opt) + 6);
+ pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0;
+ pseudo.junk[3] = IPPROTO_ICMPV6;
+
+ /* Generate checksum */
+
+ checksum = inet_checksum((unsigned short int *)&pseudo, sizeof(pseudo)/2, ~0);
+ checksum = inet_checksum((unsigned short int *)ns, sizeof(*ns)/2 + 4, checksum);
+
+ ns->nd_ns_hdr.icmp6_cksum = htons(checksum);
+
+ write_packet(packet);
+cp
+}
+
void route_arp(vpn_packet_t *packet)
{
struct ether_arp *arp;
subnet_t *subnet;
unsigned char ipbuf[4];
- ipv4_t dest;
cp
/* First, snatch the source address from the ARP packet */
return;
}
- /* Check if the IP address exists on the VPN */
+ /* Check if the IPv4 address exists on the VPN */
- dest = ntohl(*((unsigned long*)(arp->arp_tpa)));
- subnet = lookup_subnet_ipv4(&dest);
+ subnet = lookup_subnet_ipv4((ipv4_t *)arp->arp_tpa);
if(!subnet)
{
void route_outgoing(vpn_packet_t *packet)
{
unsigned short int type;
- node_t *n;
+ node_t *n = NULL;
cp
/* FIXME: multicast? */
n = route_ipv4(packet);
break;
case 0x86DD:
+ if(packet->data[20] == IPPROTO_ICMPV6 && packet->data[54] == ND_NEIGHBOR_SOLICIT)
+ {
+ route_neighborsol(packet);
+ return;
+ }
n = route_ipv6(packet);
break;
case 0x0806:
switch(routing_mode)
{
case RMODE_ROUTER:
- memcpy(packet->data, mymac.net.mac.address.x, 6); /* Override destination address to make the kernel accept it */
- write_packet(packet);
+ {
+ node_t *n = NULL;
+ unsigned short int type;
+
+ type = ntohs(*((unsigned short*)(&packet->data[12])));
+ switch(type)
+ {
+ case 0x0800:
+ n = route_ipv4(packet);
+ break;
+ case 0x86DD:
+ n = route_ipv6(packet);
+ break;
+ default:
+ n = myself;
+ break;
+ }
+
+ if(n)
+ {
+ if(n == myself)
+ {
+ memcpy(packet->data, mymac.net.mac.address.x, 6);
+ write_packet(packet);
+ }
+ else
+ send_packet(n, packet);
+ }
+ }
break;
case RMODE_SWITCH:
{