/*
route.c -- routing
- Copyright (C) 2000-2003 Ivo Timmermans <ivo@o2w.nl>,
- 2000-2003 Guus Sliepen <guus@sliepen.eu.org>
+ 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 1.1.2.69 2003/12/08 12:00:40 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 "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 "connection.h"
-#include "device.h"
-#include "ethernet.h"
-#include "ipv4.h"
-#include "ipv6.h"
#include "logger.h"
#include "net.h"
-#include "protocol.h"
#include "route.h"
-#include "subnet.h"
#include "utils.h"
+#include "libmeshlink.h"
rmode_t routing_mode = RMODE_ROUTER;
+fmode_t forwarding_mode = FMODE_INTERNAL;
+bmode_t broadcast_mode = BMODE_MST;
+bool decrement_ttl = false;
+bool directonly = false;
bool priorityinheritance = false;
int macexpire = 600;
-bool overwrite_mac = false;
mac_t mymac = {{0xFE, 0xFD, 0, 0, 0, 0}};
-
-/* Sizes of various headers */
-
-static const size_t ether_size = sizeof(struct ether_header);
-static const size_t arp_size = sizeof(struct ether_arp);
-static const size_t ip_size = sizeof(struct ip);
-static const size_t icmp_size = sizeof(struct icmp) - sizeof(struct ip);
-static const size_t ip6_size = sizeof(struct ip6_hdr);
-static const size_t icmp6_size = sizeof(struct icmp6_hdr);
-static const size_t ns_size = sizeof(struct nd_neighbor_solicit);
-static const size_t opt_size = sizeof(struct nd_opt_hdr);
-
-/* RFC 1071 */
-
-static uint16_t inet_checksum(void *data, int len, uint16_t prevsum)
-{
- uint16_t *p = data;
- uint32_t checksum = prevsum ^ 0xFFFF;
-
- while(len >= 2) {
- checksum += *p++;
- len -= 2;
- }
-
- if(len)
- checksum += *(unsigned char *)p;
-
- while(checksum >> 16)
- checksum = (checksum & 0xFFFF) + (checksum >> 16);
-
- return ~checksum;
-}
+bool pcap = false;
static bool ratelimit(int frequency) {
static time_t lasttime = 0;
static int count = 0;
-
- if(lasttime == now) {
- if(++count > frequency)
+
+ if(lasttime == now.tv_sec) {
+ if(count >= frequency)
return true;
} else {
- lasttime = now;
+ lasttime = now.tv_sec;
count = 0;
}
+ count++;
return false;
}
-
-static void learn_mac(mac_t *address)
-{
- subnet_t *subnet;
- avl_node_t *node;
- connection_t *c;
-
- cp();
-
- subnet = lookup_subnet_mac(address);
-
- /* If we don't know this MAC address yet, store it */
-
- if(!subnet || subnet->owner != myself) {
- ifdebug(TRAFFIC) logger(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();
- 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) {
- c = node->data;
- if(c->status.active)
- 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 = node->data;
- if(s->type == SUBNET_MAC && s->net.mac.lastseen && s->net.mac.lastseen + macexpire < now) {
- ifdebug(TRAFFIC) logger(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 = node2->data;
- if(c->status.active)
- send_del_subnet(c, s);
- }
-
- subnet_del(myself, s);
- }
- }
-}
-
-static node_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;
-}
-
-/* RFC 792 */
-
-static void route_ipv4_unreachable(vpn_packet_t *packet, uint8_t code)
-{
- struct ip ip;
- struct icmp icmp;
-
- struct in_addr ip_src;
- struct in_addr ip_dst;
- uint32_t oldlen;
-
- if(ratelimit(3))
- return;
-
- cp();
-
- /* Copy headers from packet into properly aligned structs on the stack */
-
- memcpy(&ip, packet->data + ether_size, ip_size);
- memcpy(&icmp, packet->data + ether_size + ip_size, icmp_size);
-
- /* Remember original source and destination */
-
- memcpy(&ip_src, &ip.ip_src, sizeof(ip_src));
- memcpy(&ip_dst, &ip.ip_dst, sizeof(ip_dst));
-
- oldlen = packet->len - ether_size;
-
- if(oldlen >= IP_MSS - ip_size - icmp_size)
- oldlen = IP_MSS - ip_size - icmp_size;
-
- /* Copy first part of original contents to ICMP message */
-
- memmove(packet->data + ether_size + ip_size + icmp_size, packet->data + ether_size, oldlen);
-
- /* Fill in IPv4 header */
-
- ip.ip_v = 4;
- ip.ip_hl = ip_size / 4;
- ip.ip_tos = 0;
- ip.ip_len = htons(ip_size + icmp_size + oldlen);
- ip.ip_id = 0;
- ip.ip_off = 0;
- ip.ip_ttl = 255;
- ip.ip_p = IPPROTO_ICMP;
- ip.ip_sum = 0;
- memcpy(&ip.ip_src, &ip_dst, sizeof(ip_src));
- memcpy(&ip.ip_dst, &ip_src, sizeof(ip_dst));
-
- ip.ip_sum = inet_checksum(&ip, ip_size, ~0);
-
- /* Fill in ICMP header */
-
- icmp.icmp_type = ICMP_DEST_UNREACH;
- icmp.icmp_code = code;
- icmp.icmp_cksum = 0;
-
- icmp.icmp_cksum = inet_checksum(&icmp, icmp_size, ~0);
- icmp.icmp_cksum = inet_checksum(packet->data + ether_size + ip_size + icmp_size, oldlen, icmp.icmp_cksum);
-
- /* Copy structs on stack back to packet */
-
- memcpy(packet->data + ether_size, &ip, ip_size);
- memcpy(packet->data + ether_size + ip_size, &icmp, icmp_size);
-
- packet->len = ether_size + ip_size + icmp_size + oldlen;
-
- write_packet(packet);
-}
-
-static node_t *route_ipv4(vpn_packet_t *packet)
-{
- subnet_t *subnet;
-
- cp();
-
- if(priorityinheritance)
- packet->priority = packet->data[15];
-
- subnet = lookup_subnet_ipv4((ipv4_t *) &packet->data[30]);
-
- if(!subnet) {
- ifdebug(TRAFFIC) logger(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]);
-
- route_ipv4_unreachable(packet, ICMP_NET_UNKNOWN);
- return NULL;
- }
-
- if(!subnet->owner->status.reachable)
- route_ipv4_unreachable(packet, ICMP_NET_UNREACH);
-
- return subnet->owner;
-}
-
-/* RFC 2463 */
-
-static void route_ipv6_unreachable(vpn_packet_t *packet, uint8_t code)
-{
- struct ip6_hdr ip6;
- struct icmp6_hdr icmp6;
- uint16_t checksum;
-
- struct {
- struct in6_addr ip6_src; /* source address */
- struct in6_addr ip6_dst; /* destination address */
- uint32_t length;
- uint32_t next;
- } pseudo;
-
- if(ratelimit(3))
- return;
-
- cp();
-
- /* Copy headers from packet to structs on the stack */
-
- memcpy(&ip6, packet->data + ether_size, ip6_size);
- memcpy(&icmp6, packet->data + ether_size + ip6_size, icmp6_size);
-
- /* Remember original source and destination */
-
- memcpy(&pseudo.ip6_src, &ip6.ip6_dst, sizeof(ip6.ip6_src));
- memcpy(&pseudo.ip6_dst, &ip6.ip6_src, sizeof(ip6.ip6_dst));
-
- pseudo.length = ntohs(ip6.ip6_plen) + ip6_size;
-
- if(pseudo.length >= IP_MSS - ip6_size - icmp6_size)
- pseudo.length = IP_MSS - ip6_size - icmp6_size;
-
- /* Copy first part of original contents to ICMP message */
-
- memmove(packet->data + ether_size + ip6_size + icmp6_size, packet->data + ether_size, pseudo.length);
-
- /* Fill in IPv6 header */
-
- ip6.ip6_flow = htonl(0x60000000UL);
- ip6.ip6_plen = htons(icmp6_size + pseudo.length);
- ip6.ip6_nxt = IPPROTO_ICMPV6;
- ip6.ip6_hlim = 255;
- memcpy(&ip6.ip6_src, &pseudo.ip6_src, sizeof(ip6.ip6_src));
- memcpy(&ip6.ip6_dst, &pseudo.ip6_dst, sizeof(ip6.ip6_dst));
-
- /* Fill in ICMP header */
-
- icmp6.icmp6_type = ICMP6_DST_UNREACH;
- icmp6.icmp6_code = code;
- icmp6.icmp6_cksum = 0;
-
- /* Create pseudo header */
-
- pseudo.length = htonl(icmp6_size + pseudo.length);
- pseudo.next = htonl(IPPROTO_ICMPV6);
-
- /* Generate checksum */
-
- 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);
-
- icmp6.icmp6_cksum = checksum;
-
- /* Copy structs on stack back to packet */
-
- memcpy(packet->data + ether_size, &ip6, ip6_size);
- memcpy(packet->data + ether_size + ip6_size, &icmp6, icmp6_size);
-
- packet->len = ether_size + ip6_size + ntohl(pseudo.length);
-
- write_packet(packet);
-}
-
-static node_t *route_ipv6(vpn_packet_t *packet)
-{
- subnet_t *subnet;
-
- cp();
-
- subnet = lookup_subnet_ipv6((ipv6_t *) &packet->data[38]);
-
- if(!subnet) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet: unknown IPv6 destination address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"),
- 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]));
- route_ipv6_unreachable(packet, ICMP6_DST_UNREACH_ADDR);
-
- return NULL;
- }
-
- if(!subnet->owner->status.reachable)
- route_ipv6_unreachable(packet, ICMP6_DST_UNREACH_NOROUTE);
-
- return subnet->owner;
-}
-
-/* RFC 2461 */
-
-static void route_neighborsol(vpn_packet_t *packet)
-{
- struct ip6_hdr ip6;
- struct nd_neighbor_solicit ns;
- struct nd_opt_hdr opt;
- subnet_t *subnet;
- uint16_t checksum;
-
- struct {
- struct in6_addr ip6_src; /* source address */
- struct in6_addr ip6_dst; /* destination address */
- uint32_t length;
- uint32_t next;
- } pseudo;
-
- cp();
-
- /* Copy headers from packet to structs on the stack */
-
- memcpy(&ip6, packet->data + ether_size, ip6_size);
- memcpy(&ns, packet->data + ether_size + ip6_size, ns_size);
- memcpy(&opt, packet->data + ether_size + ip6_size + ns_size, opt_size);
-
- /* First, snatch the source address from the neighbor solicitation packet */
-
- if(overwrite_mac)
- memcpy(mymac.x, packet->data + ETH_ALEN, ETH_ALEN);
-
- /* 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) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet: received unknown type neighbor solicitation request"));
- return;
- }
-
- /* Create pseudo header */
-
- memcpy(&pseudo.ip6_src, &ip6.ip6_src, sizeof(ip6.ip6_src));
- memcpy(&pseudo.ip6_dst, &ip6.ip6_dst, sizeof(ip6.ip6_dst));
- pseudo.length = htonl(ns_size + opt_size + ETH_ALEN);
- pseudo.next = htonl(IPPROTO_ICMPV6);
-
- /* Generate checksum */
-
- 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);
-
- if(checksum) {
- ifdebug(TRAFFIC) logger(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) {
- ifdebug(TRAFFIC) logger(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 + 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(&ip6.ip6_dst, &ip6.ip6_src, sizeof(ip6.ip6_dst)); /* ... */
- memcpy(&ip6.ip6_src, &ns.nd_ns_target, sizeof(ip6.ip6_src)); /* swap destination and source protocol address */
-
- memcpy(packet->data + ether_size + ip6_size + ns_size + opt_size, packet->data + ETH_ALEN, ETH_ALEN); /* add fake source hard addr */
-
- ns.nd_ns_cksum = 0;
- ns.nd_ns_type = ND_NEIGHBOR_ADVERT;
- ns.nd_ns_reserved = htonl(0x40000000UL); /* Set solicited flag */
- opt.nd_opt_type = ND_OPT_TARGET_LINKADDR;
-
- /* Create pseudo header */
-
- memcpy(&pseudo.ip6_src, &ip6.ip6_src, sizeof(ip6.ip6_src));
- memcpy(&pseudo.ip6_dst, &ip6.ip6_dst, sizeof(ip6.ip6_dst));
- pseudo.length = htonl(ns_size + opt_size + ETH_ALEN);
- pseudo.next = htonl(IPPROTO_ICMPV6);
-
- /* Generate checksum */
-
- 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);
-
- ns.nd_ns_hdr.icmp6_cksum = checksum;
-
- /* Copy structs on stack back to packet */
-
- memcpy(packet->data + ether_size, &ip6, ip6_size);
- memcpy(packet->data + ether_size + ip6_size, &ns, ns_size);
- memcpy(packet->data + ether_size + ip6_size + ns_size, &opt, opt_size);
-
- write_packet(packet);
-}
-
-/* RFC 826 */
-
-static void route_arp(vpn_packet_t *packet)
-{
- struct ether_arp arp;
- subnet_t *subnet;
- struct in_addr addr;
-
- cp();
-
- /* First, snatch the source address from the ARP packet */
-
- if(overwrite_mac)
- memcpy(mymac.x, packet->data + ETH_ALEN, ETH_ALEN);
-
- /* Copy headers from packet to structs on the stack */
-
- memcpy(&arp, packet->data + ether_size, arp_size);
-
- /* 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) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet: received unknown type ARP request"));
- return;
- }
-
- /* Check if the IPv4 address exists on the VPN */
-
- subnet = lookup_subnet_ipv4((ipv4_t *) &arp.arp_tpa);
-
- if(!subnet) {
- ifdebug(TRAFFIC) logger(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 + 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(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 */
- arp.arp_op = htons(ARPOP_REPLY);
-
- /* Copy structs on stack back to packet */
-
- memcpy(packet->data + ether_size, &arp, arp_size);
-
- write_packet(packet);
-}
-
-void route_outgoing(vpn_packet_t *packet)
-{
- uint16_t type;
- node_t *n = NULL;
-
- cp();
-
- if(packet->len < ether_size) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Read too short packet"));
- return;
- }
-
- /* FIXME: multicast? */
-
- switch (routing_mode) {
- case RMODE_ROUTER:
- type = ntohs(*((uint16_t *)(&packet->data[12])));
- switch (type) {
- case ETH_P_IP:
- if(packet->len < ether_size + ip_size) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Read too short packet"));
- return;
- }
-
- n = route_ipv4(packet);
- break;
-
- case ETH_P_IPV6:
- if(packet->len < ether_size + ip6_size) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Read too short packet"));
- return;
- }
-
- if(packet->data[20] == IPPROTO_ICMPV6 && packet->len >= ether_size + ip6_size + ns_size && packet->data[54] == ND_NEIGHBOR_SOLICIT) {
- route_neighborsol(packet);
- return;
- }
- n = route_ipv6(packet);
- break;
-
- case ETH_P_ARP:
- if(packet->len < ether_size + arp_size) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Read too short packet"));
- return;
- }
-
- route_arp(packet);
- return;
-
- default:
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet: unknown type %hx"), type);
- return;
- }
- if(n)
- send_packet(n, packet);
- break;
-
- case RMODE_SWITCH:
- n = route_mac(packet);
- if(n)
- send_packet(n, packet);
- else
- broadcast_packet(myself, packet);
- break;
-
- case RMODE_HUB:
- broadcast_packet(myself, packet);
- break;
- }
+static bool checklength(node_t *source, vpn_packet_t *packet, length_t length) {
+ if(packet->len < length) {
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Got too short packet from %s (%s)", source->name, source->hostname);
+ return false;
+ } else
+ return true;
}
-void route_incoming(node_t *source, vpn_packet_t *packet)
-{
- if(packet->len < ether_size) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Read too short packet"));
- return;
- }
-
- switch (routing_mode) {
- case RMODE_ROUTER:
- {
- node_t *n = NULL;
- uint16_t type;
-
- type = ntohs(*((uint16_t *)(&packet->data[12])));
- switch (type) {
- case ETH_P_IP:
- if(packet->len < ether_size + ip_size) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Read too short packet"));
- return;
- }
-
- n = route_ipv4(packet);
- break;
-
- case ETH_P_IPV6:
- if(packet->len < ether_size + ip6_size) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Read too short packet"));
- return;
- }
-
- n = route_ipv6(packet);
- break;
-
- default:
- n = myself;
- break;
- }
-
- if(n) {
- if(n == myself) {
- if(overwrite_mac)
- memcpy(packet->data, mymac.x, ETH_ALEN);
- write_packet(packet);
- } else
- send_packet(n, packet);
- }
- }
- break;
-
- case RMODE_SWITCH:
- {
- subnet_t *subnet;
-
- subnet = lookup_subnet_mac((mac_t *)(&packet->data[0]));
-
- if(subnet) {
- if(subnet->owner == myself)
- write_packet(packet);
- else
- send_packet(subnet->owner, packet);
- } else {
- broadcast_packet(source, packet);
- write_packet(packet);
- }
- }
- break;
-
- case RMODE_HUB:
- broadcast_packet(source, packet); /* Spread it on */
- write_packet(packet);
- break;
- }
+void route(node_t *source,vpn_packet_t *packet) {
+ // TODO: route on name or key
+
+ node_t* owner = NULL;
+ tincpackethdr* hdr = (tincpackethdr*)packet->data;
+ owner = lookup_node(hdr->destination);
+ if (owner == NULL) {
+ //Lookup failed
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cant lookup the owner of a packet in the route() function. This should never happen \n");
+ return;
+ }
+
+ if (owner == myself ) {
+ //TODO: implement sending received data from meshlink library to the application
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "I received a packet for me with payload: %s \n", packet->data + 46);
+ return;
+ }
+
+ if(!owner->status.reachable) {
+ //TODO: check what to do here, not just print a warning
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "The owner of a packet in the route() function is unreachable. Dropping packet. \n");
+ return;
+ }
+
+ //TODO: I skipped here a lot of checks !
+
+ send_packet(owner,packet);
+ return;
}
projects / meshlink / blobdiff