/*
route.c -- routing
- Copyright (C) 2000 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000 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 1.1.2.3 2000/11/20 19:12:17 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"
-
-#include <utils.h>
-#include <xalloc.h>
+#include "system.h"
+#include "logger.h"
+#include "meshlink_internal.h"
#include "net.h"
-#include "connection.h"
+#include "route.h"
+#include "utils.h"
+
+bool decrement_ttl = false;
+
+static bool checklength(node_t *source, vpn_packet_t *packet, uint16_t length) {
+ if(packet->len < length) {
+ logger(source->mesh, MESHLINK_WARNING, "Got too short packet from %s", source->name);
+ return false;
+ } else {
+ return true;
+ }
+}
-#include "system.h"
+void route(meshlink_handle_t *mesh, node_t *source, vpn_packet_t *packet) {
+ // TODO: route on name or key
-int routing_mode = 0; /* Will be used to determine if we route by MAC or by payload's protocol */
-
-connection_t *route_packet(vpn_packet_t *packet)
-{
- unsigned short type;
-cp
- type = ntohs(*((unsigned short*)(&packet.data[12])))
-
- if(routing_mode)
- {
- return route_mac(packet);
- }
-
- switch(type)
- {
- case 0x0800:
- return route_ipv4(packet);
- case 0x86DD:
- return route_ipv6(packet);
-/*
- case 0x8137:
- return route_ipx(packet);
- case 0x0806:
- return route_arp(packet);
-*/
- default:
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(LOG_WARNING, _("Cannot route packet: unknown type %hx"), type);
- }
- return NULL;
- }
-}
+ node_t *owner = NULL;
+ node_t *via = NULL;
+ meshlink_packethdr_t *hdr = (meshlink_packethdr_t *) packet->data;
+ owner = lookup_node(mesh, (char *)hdr->destination);
+ logger(mesh, MESHLINK_DEBUG, "Routing packet from \"%s\" to \"%s\"\n", hdr->source, hdr->destination);
-connection_t *route_mac(vpn_packet_t *packet)
-{
- connection_t *cl;
-cp
- cl = lookup_subnet_mac((mac_t *)(&packet.data[6]));
- if(!cl)
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %x:%x:%x:%x:%x:%x"),
- packet.data[6],
- packet.data[7],
- packet.data[8],
- packet.data[9],
- packet.data[10],
- packet.data[11]);
- }
-cp
- return cl;
-}
+ //Check Length
+ if(!checklength(source, packet, sizeof(*hdr))) {
+ return;
+ }
+ if(owner == NULL) {
+ //Lookup failed
+ logger(mesh, MESHLINK_WARNING, "Can't lookup the owner of a packet in the route() function. This should never happen!\n");
+ logger(mesh, MESHLINK_WARNING, "Destination was: %s\n", hdr->destination);
+ return;
+ }
-connection_t *route_ipv4(vpn_packet_t *packet)
-{
- ipv4_t dest;
- connection_t *cl;
-cp
- dest = ntohl(*((unsigned long*)(&packet.data[30]);
-
- cl = lookup_subnet_ipv4(dest);
- if(!cl)
- 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]);
- }
-cp
- return cl;
-}
+ if(owner == mesh->self) {
+ const void *payload = packet->data + sizeof(*hdr);
+ size_t len = packet->len - sizeof(*hdr);
+
+ char hex[len * 2 + 1];
+
+ if(mesh->log_level <= MESHLINK_DEBUG) {
+ bin2hex(payload, hex, len); // don't do this unless it's going to be logged
+ }
+
+ logger(mesh, MESHLINK_DEBUG, "I received a packet for me with payload: %s\n", hex);
+
+ if(mesh->receive_cb) {
+ mesh->receive_cb(mesh, (meshlink_node_t *)source, payload, len);
+ }
+
+ return;
+ }
+
+ if(!owner->status.reachable) {
+ //TODO: check what to do here, not just print a warning
+ logger(mesh, MESHLINK_WARNING, "The owner of a packet in the route() function is unreachable. Dropping packet.\n");
+ return;
+ }
+
+ via = (owner->via == mesh->self) ? owner->nexthop : owner->via;
+
+ if(via == source) {
+ logger(mesh, MESHLINK_ERROR, "Routing loop for packet from %s!", source->name);
+ return;
+ }
-connection_t *route_ipv6(vpn_packet_t *packet)
-{
-cp
- syslog(LOG_WARNING, _("Cannot route packet: IPv6 routing not implemented yet"));
-cp
- return NULL;
+ send_packet(mesh, owner, packet);
+ return;
}
projects / meshlink / blobdiff