- struct ip6_hdr *hdr;
- struct nd_neighbor_solicit *ns;
- struct nd_opt_hdr *opt;
- subnet_t *subnet;
- short int cksum;
-
- 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(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 */
-#if 0
- 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 */
-#endif
-
- syslog(LOG_DEBUG, "Neighbor solicitation request with checksum %hx", ntohs(ns->nd_ns_hdr.icmp6_cksum));
-
- /* Create pseudo header */
-
- memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16);
- memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16);
- pseudo.length = htonl(sizeof(*ns));
- pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0;
- pseudo.junk[3] = IPPROTO_ICMPV6;
-
- /* Generate checksum */
-
- ns->nd_ns_hdr.icmp6_cksum = 0;
-
- cksum = ipv6_cksum((short int *)&pseudo, sizeof(pseudo)/2, 0);
-
- syslog(LOG_DEBUG, "Our checksum %hx", cksum);
-
- cksum = ipv6_cksum((short int *)ns, sizeof(*ns)/2, cksum);
-
- syslog(LOG_DEBUG, "Our checksum %hx", cksum);
-
- cksum = ipv6_cksum((short int *)opt, sizeof(*opt)/2, cksum);
-
- syslog(LOG_DEBUG, "Our checksum %hx", cksum);
-
- /* 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;
- 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(struct icmp6_hdr));
- pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0;
- pseudo.junk[3] = IPPROTO_ICMPV6;
-
- /* Generate checksum */
-
- cksum = ipv6_cksum((short int *)&pseudo, sizeof(pseudo)/2, 0);
- cksum = ipv6_cksum((short int *)ns, sizeof(*ns)/2, cksum);
-
- ns->nd_ns_hdr.icmp6_cksum = htons(cksum);
-
- write_packet(packet);
-cp
+ 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;