/*
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 1.1.2.7 2001/03/04 13:59:32 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 <netinet/in.h>
-#include <utils.h>
-#include <xalloc.h>
-#include <syslog.h>
+#include "system.h"
+#include "logger.h"
+#include "meshlink_internal.h"
#include "net.h"
-#include "connection.h"
-#include "subnet.h"
#include "route.h"
+#include "utils.h"
-#include "system.h"
+static bool checklength(node_t *source, vpn_packet_t *packet, uint16_t length) {
+ assert(length);
-int routing_mode = RMODE_ROUTER;
-subnet_t mymac;
-
-void learn_mac(connection_t *source, mac_t *address)
-{
- subnet_t *subnet;
-cp
- subnet = lookup_subnet_mac(address);
-
- if(!subnet)
- {
- subnet = new_subnet();
- subnet->type = SUBNET_MAC;
-// subnet->lasttime = gettimeofday();
- memcpy(&subnet->net.mac.address, address, sizeof(mac_t));
- subnet_add(source, subnet);
-
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(LOG_DEBUG, _("Learned new MAC address %x:%x:%x:%x:%x:%x from %s (%s)"),
- address->x[0],
- address->x[1],
- address->x[2],
- address->x[3],
- address->x[4],
- address->x[5],
- source->name, source->hostname);
- }
- }
+ 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(connection_t *source, vpn_packet_t *packet)
-{
- subnet_t *subnet;
-cp
- /* Learn source address */
-
- learn_mac(source, (mac_t *)(&packet->data[0]));
-
- /* Lookup destination address */
-
- subnet = lookup_subnet_mac((mac_t *)(&packet->data[6]));
-
- if(!subnet)
- {
- 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]);
- }
- return NULL;
- }
-cp
- return subnet->owner;
-}
+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);
-
- 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]);
- }
-
- return NULL;
- }
-cp
- return subnet->owner;
-}
+ // TODO: route on name or key
-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;
-}
+ 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);
-void route_outgoing(vpn_packet_t *packet)
-{
- unsigned short int type;
- avl_node_t *node;
- 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;
- 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(myself, packet);
- if(cl)
- send_packet(cl, packet);
- break;
-
- case RMODE_HUB:
- for(node = connection_tree->head; node; node = node->next)
- {
- cl = (connection_t *)node->data;
- if(cl->status.active)
- send_packet(cl, packet);
- }
- break;
- }
-}
+ //Check Length
+ if(!checklength(source, packet, sizeof(*hdr))) {
+ return;
+ }
+
+ 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;
+ }
+
+ if(dest == 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(!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;
+ }
+
+ if(dest == source) {
+ logger(mesh, MESHLINK_ERROR, "Routing loop for packet from %s!", source->name);
+ return;
+ }
-void route_incoming(connection_t *source, vpn_packet_t *packet)
-{
- switch(routing_mode)
- {
- case RMODE_SWITCH:
- learn_mac(source, (mac_t *)(&packet->data[0]));
- break;
- case RMODE_ROUTER:
- memcpy(packet->data, mymac.net.mac.address.x, 6);
- }
-
- accept_packet(packet);
+ send_packet(mesh, dest, packet);
+ return;
}
projects / meshlink / blobdiff