X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Froute.c;h=fc02c67fbca30be25fdf766ba9b4fffb22f6be44;hp=1ac3e12ae2372bc9f06ab8e5d79d16ef0b5b0665;hb=46fa10cec7b6bf26773f5e86e7b8118d9075e807;hpb=c2b9c06062d36bde859b630b99a08c7b7428e721 diff --git a/src/route.c b/src/route.c index 1ac3e12a..fc02c67f 100644 --- a/src/route.c +++ b/src/route.c @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: route.c,v 1.1.2.23 2002/02/18 16:25:19 guus Exp $ + $Id: route.c,v 1.1.2.30 2002/03/11 13:14:53 guus Exp $ */ #include "config.h" @@ -33,6 +33,8 @@ #else #include #endif +#include +#include #include #include #include @@ -51,6 +53,8 @@ #include "system.h" int routing_mode = RMODE_ROUTER; +int priorityinheritance = 0; +int macexpire = 600; subnet_t mymac; void learn_mac(mac_t *address) @@ -83,6 +87,35 @@ cp 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) @@ -107,6 +140,9 @@ 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]); cp if(!subnet) @@ -150,6 +186,71 @@ cp return subnet->owner; } +void route_neighborsol(vpn_packet_t *packet) +{ + struct ip6_hdr *hdr; + struct nd_neighbor_solicit *ns; + struct nd_opt_hdr *opt; + subnet_t *subnet; +cp + hdr = (struct ip6_hdr *)(packet->data + 14); + ns = (struct nd_neighbor_solicit *)(packet->data + 14 + sizeof(struct ip6_hdr)); + opt = (struct nd_opt_hdr *)(packet->data + 14 + sizeof(struct ip6_hdr) + sizeof(struct nd_neighbor_solicit)); + + /* 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; + } + + /* 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(ns->nd_ns_target.s6_addr16[0]), ntohs(ns->nd_ns_target.s6_addr16[1]), ntohs(ns->nd_ns_target.s6_addr16[2]), ntohs(ns->nd_ns_target.s6_addr16[3]), + ntohs(ns->nd_ns_target.s6_addr16[4]), ntohs(ns->nd_ns_target.s6_addr16[5]), ntohs(ns->nd_ns_target.s6_addr16[6]), ntohs(ns->nd_ns_target.s6_addr16[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_type = ND_NEIGHBOR_ADVERT; + opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; + + write_packet(packet); +cp +} + void route_arp(vpn_packet_t *packet) { struct ether_arp *arp; @@ -182,7 +283,7 @@ cp return; } - /* Check if the IP address exists on the VPN */ + /* Check if the IPv4 address exists on the VPN */ subnet = lookup_subnet_ipv4((ipv4_t *)arp->arp_tpa); @@ -220,7 +321,7 @@ cp void route_outgoing(vpn_packet_t *packet) { unsigned short int type; - node_t *n; + node_t *n = NULL; cp /* FIXME: multicast? */ @@ -235,6 +336,11 @@ cp break; case 0x86DD: n = route_ipv6(packet); + if(!n && packet->data[6] == 0x33 && packet->data[7] == 0x33 && packet->data[8] == 0xff) + { + route_neighborsol(packet); + return; + } break; case 0x0806: route_arp(packet); @@ -269,8 +375,35 @@ void route_incoming(node_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 */ - 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: {