/*
route.c -- routing
- Copyright (C) 2000,2001 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000,2001 Guus Sliepen <guus@sliepen.warande.net>
+ Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: route.c,v 1.1.2.16 2001/07/20 13:54:19 guus Exp $
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "config.h"
-
-#ifdef HAVE_FREEBSD
- #include <sys/param.h>
-#endif
-#include <sys/socket.h>
-#include <netinet/in.h>
-#ifdef HAVE_SOLARIS
- #include <netinet/if.h>
- #define ETHER_ADDR_LEN 6
-#else
- #include <net/ethernet.h>
-#endif
-#include <netinet/if_ether.h>
-#include <utils.h>
-#include <xalloc.h>
-#include <syslog.h>
-#include <string.h>
-
-#include <avl_tree.h>
+#include "system.h"
+#include "logger.h"
+#include "meshlink_internal.h"
#include "net.h"
-#include "connection.h"
-#include "subnet.h"
#include "route.h"
-#include "protocol.h"
-
-#include "system.h"
-
-int routing_mode = RMODE_ROUTER;
-subnet_t mymac;
+#include "utils.h"
-void learn_mac(mac_t *address)
-{
- subnet_t *subnet;
- avl_node_t *node;
- connection_t *p;
-cp
- subnet = lookup_subnet_mac(address);
+static bool checklength(node_t *source, vpn_packet_t *packet, uint16_t length) {
+ assert(length);
- /* If we don't know this MAC address yet, store it */
-
- if(!subnet || subnet->owner!=myself)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_INFO, _("Learned new MAC address %hhx:%hhx:%hhx:%hhx:%hhx:%hhx"),
- address->x[0], address->x[1], address->x[2], address->x[3], address->x[4], address->x[5]);
-
- subnet = new_subnet();
- subnet->type = SUBNET_MAC;
- memcpy(&subnet->net.mac.address, address, sizeof(mac_t));
- subnet_add(myself, subnet);
-
- /* And tell all other tinc daemons it's our MAC */
-
- for(node = connection_tree->head; node; node = node->next)
- {
- p = (connection_t *)node->data;
- if(p->status.active && p!= myself)
- send_add_subnet(p, subnet);
- }
- }
+ if(packet->len < length) {
+ logger(source->mesh, MESHLINK_WARNING, "Got too short packet from %s", source->name);
+ return false;
+ } else {
+ return true;
+ }
}
-connection_t *route_mac(vpn_packet_t *packet)
-{
- subnet_t *subnet;
-cp
- /* Learn source address */
-
- learn_mac((mac_t *)(&packet->data[6]));
-
- /* Lookup destination address */
-
- subnet = lookup_subnet_mac((mac_t *)(&packet->data[0]));
-
- if(subnet)
- return subnet->owner;
- else
- return NULL;
-}
+void route(meshlink_handle_t *mesh, node_t *source, vpn_packet_t *packet) {
+ assert(source);
-connection_t *route_ipv4(vpn_packet_t *packet)
-{
- ipv4_t dest;
- subnet_t *subnet;
-cp
- dest = ntohl(*((unsigned long*)(&packet->data[30])));
-
- subnet = lookup_subnet_ipv4(&dest);
+ // TODO: route on name or key
- if(!subnet)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %d.%d.%d.%d"),
- packet->data[30], packet->data[31], packet->data[32], packet->data[33]);
- }
+ meshlink_packethdr_t *hdr = (meshlink_packethdr_t *) packet->data;
+ node_t *dest = lookup_node(mesh, (char *)hdr->destination);
+ logger(mesh, MESHLINK_DEBUG, "Routing packet from \"%s\" to \"%s\"\n", hdr->source, hdr->destination);
- return NULL;
- }
-cp
- return subnet->owner;
-}
+ //Check Length
+ if(!checklength(source, packet, sizeof(*hdr))) {
+ return;
+ }
-connection_t *route_ipv6(vpn_packet_t *packet)
-{
-cp
- if(debug_lvl > DEBUG_NOTHING)
- {
- syslog(LOG_WARNING, _("Cannot route packet: IPv6 routing not yet implemented"));
- }
-cp
- return NULL;
-}
+ if(dest == NULL) {
+ //Lookup failed
+ logger(mesh, MESHLINK_WARNING, "Can't lookup the destination of a packet in the route() function. This should never happen!\n");
+ logger(mesh, MESHLINK_WARNING, "Destination was: %s\n", hdr->destination);
+ return;
+ }
-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 */
+ if(dest == mesh->self) {
+ const void *payload = packet->data + sizeof(*hdr);
+ size_t len = packet->len - sizeof(*hdr);
- memcpy(mymac.net.mac.address.x, packet->data + 6, 6);
+ char hex[len * 2 + 1];
- /* This routine generates replies to ARP requests.
- You don't need to set NOARP flag on the interface anymore (which is broken on FreeBSD).
- Most of the code here is taken from choparp.c by Takamichi Tateoka (tree@mma.club.uec.ac.jp)
- */
+ if(mesh->log_level <= MESHLINK_DEBUG) {
+ bin2hex(payload, hex, len); // don't do this unless it's going to be logged
+ }
- arp = (struct ether_arp *)(packet->data + 14);
+ logger(mesh, MESHLINK_DEBUG, "I received a packet for me with payload: %s\n", hex);
- /* Check if this is a valid ARP request */
+ if(mesh->receive_cb) {
+ mesh->receive_cb(mesh, (meshlink_node_t *)source, payload, len);
+ }
- if(ntohs(arp->arp_hrd) != ARPHRD_ETHER ||
- ntohs(arp->arp_pro) != ETHERTYPE_IP ||
- (int) (arp->arp_hln) != ETHER_ADDR_LEN ||
- (int) (arp->arp_pln) != 4 ||
- ntohs(arp->arp_op) != ARPOP_REQUEST )
- {
- if(debug_lvl > DEBUG_TRAFFIC)
- {
- syslog(LOG_WARNING, _("Cannot route packet: received unknown type ARP request"));
- }
- return;
- }
-
- /* Check if the IP address exists on the VPN */
-
- dest = ntohl(*((unsigned long*)(arp->arp_tpa)));
- subnet = lookup_subnet_ipv4(&dest);
-
- if(!subnet)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(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;
- }
-
- /* Check if it is for our own subnet */
-
- if(subnet->owner == myself)
- return; /* silently ignore */
-
- 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(ipbuf, arp->arp_tpa, 4); /* save protocol addr */
- memcpy(arp->arp_tpa, arp->arp_spa, 4); /* swap destination and source protocol address */
- memcpy(arp->arp_spa, ipbuf, 4); /* ... */
-
- memcpy(arp->arp_tha, arp->arp_sha, 10); /* set target hard/proto addr */
- memcpy(arp->arp_sha, packet->data + ETHER_ADDR_LEN, ETHER_ADDR_LEN); /* add fake source hard addr */
- arp->arp_op = htons(ARPOP_REPLY);
-
- accept_packet(packet);
-cp
-}
-
-void route_outgoing(vpn_packet_t *packet)
-{
- unsigned short int type;
- connection_t *cl;
-cp
- /* FIXME: multicast? */
-
- switch(routing_mode)
- {
- case RMODE_ROUTER:
- type = ntohs(*((unsigned short*)(&packet->data[12])));
- switch(type)
- {
- case 0x0800:
- cl = route_ipv4(packet);
- break;
- case 0x86DD:
- cl = route_ipv6(packet);
- break;
- case 0x0806:
- route_arp(packet);
- return;
- default:
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(LOG_WARNING, _("Cannot route packet: unknown type %hx"), type);
- }
- return;
- }
- if(cl)
- send_packet(cl, packet);
- break;
-
- case RMODE_SWITCH:
- cl = route_mac(packet);
- if(cl)
- send_packet(cl, packet);
- else
- broadcast_packet(myself, packet);
- break;
-
- case RMODE_HUB:
- broadcast_packet(myself, packet);
- break;
- }
-}
+ return;
+ }
-void route_incoming(connection_t *source, vpn_packet_t *packet)
-{
- switch(routing_mode)
- {
- case RMODE_ROUTER:
- memcpy(packet->data, mymac.net.mac.address.x, 6); /* Override destination address to make the kernel accept it */
- accept_packet(packet);
- break;
- case RMODE_SWITCH:
- {
- subnet_t *subnet;
+ if(!dest->status.reachable) {
+ //TODO: check what to do here, not just print a warning
+ logger(mesh, MESHLINK_WARNING, "The destination of a packet in the route() function is unreachable. Dropping packet.\n");
+ return;
+ }
- subnet = lookup_subnet_mac((mac_t *)(&packet->data[0]));
+ if(dest == source) {
+ logger(mesh, MESHLINK_ERROR, "Routing loop for packet from %s!", source->name);
+ return;
+ }
- if(subnet)
- {
- if(subnet->owner == myself)
- accept_packet(packet);
- else
- send_packet(subnet->owner, packet);
- }
- else
- {
- broadcast_packet(source, packet);
- accept_packet(packet);
- }
- }
- break;
- case RMODE_HUB:
- broadcast_packet(source,packet); /* Spread it on */
- accept_packet(packet);
- break;
- }
+ send_packet(mesh, dest, packet);
+ return;
}
projects / meshlink / blobdiff