- }
-cp
-}
-
-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;
-}
-
-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)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(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]);
- }
-
- return NULL;
- }
-cp
- return subnet->owner;
-}
-
-node_t *route_ipv6(vpn_packet_t *packet)
-{
- subnet_t *subnet;
-cp
- subnet = lookup_subnet_ipv6((ipv6_t *)&packet->data[38]);
-cp
- if(!subnet)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- {
- syslog(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]));
- }
-
- return NULL;
- }
-cp
- return subnet->owner;
-}
-
-uint16_t inet_checksum(uint16_t *data, int len, uint16_t prevsum)
-{
- uint32_t checksum = prevsum ^ 0xFFFF;
-
- while(len--)
- checksum += ntohs(*data++);
-
- while(checksum >> 16)
- checksum = (checksum & 0xFFFF) + (checksum >> 16);
-
- return checksum ^ 0xFFFF;
-}
-
-void route_neighborsol(vpn_packet_t *packet)
-{
- struct ip6_hdr *hdr;
- 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;
- uint8_t junk[4];
- } pseudo;
-
-cp
- hdr = (struct ip6_hdr *)(packet->data + 14);
- ns = (struct nd_neighbor_solicit *)(packet->data + 14 + sizeof(*hdr));
- opt = (struct nd_opt_hdr *)(packet->data + 14 + sizeof(*hdr) + sizeof(*ns));
-
- /* 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;
- }
-
- /* Create pseudo header */
-
- memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16);
- memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16);
- pseudo.length = htonl(sizeof(*ns) + sizeof(*opt) + 6);
- pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0;
- pseudo.junk[3] = IPPROTO_ICMPV6;
-
- /* Generate checksum */
-
- checksum = inet_checksum((uint16_t *)&pseudo, sizeof(pseudo)/2, ~0);
- checksum = inet_checksum((uint16_t *)ns, sizeof(*ns)/2 + 4, checksum);
-
- if(checksum)
- {
- if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(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)
- {
- 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(((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 + 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_cksum = 0;
- ns->nd_ns_hdr.icmp6_type = ND_NEIGHBOR_ADVERT;
- ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[0] = 0x40; /* Set solicited flag */
- ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[1] = ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[2] = ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[3] = 0;
- opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
-
- /* Create pseudo header */
-
- memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16);
- memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16);
- pseudo.length = htonl(sizeof(*ns) + sizeof(*opt) + 6);
- pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0;
- pseudo.junk[3] = IPPROTO_ICMPV6;
-
- /* Generate checksum */
-
- checksum = inet_checksum((uint16_t *)&pseudo, sizeof(pseudo)/2, ~0);
- checksum = inet_checksum((uint16_t *)ns, sizeof(*ns)/2 + 4, checksum);
-
- ns->nd_ns_hdr.icmp6_cksum = htons(checksum);
-
- write_packet(packet);
-cp