-
- cp();
-
- hdr = (struct ip *)(packet->data + 14);
- icmp = (struct icmp *)(packet->data + 14 + 20);
-
- /* Remember original source and destination */
-
- memcpy(&ip_src, &hdr->ip_src, 4);
- memcpy(&ip_dst, &hdr->ip_dst, 4);
- oldlen = packet->len - 14;
-
- if(oldlen >= IP_MSS - sizeof(*hdr) - sizeof(*icmp))
- oldlen = IP_MSS - sizeof(*hdr) - sizeof(*icmp);
-
- /* Copy first part of original contents to ICMP message */
-
- memmove(&icmp->icmp_ip, hdr, oldlen);
-
- /* Fill in IPv4 header */
-
- hdr->ip_v = 4;
- hdr->ip_hl = sizeof(*hdr) / 4;
- hdr->ip_tos = 0;
- hdr->ip_len = htons(20 + 8 + oldlen);
- hdr->ip_id = 0;
- hdr->ip_off = 0;
- hdr->ip_ttl = 255;
- hdr->ip_p = IPPROTO_ICMP;
- hdr->ip_sum = 0;
- memcpy(&hdr->ip_src, &ip_dst, 4);
- memcpy(&hdr->ip_dst, &ip_src, 4);
-
- hdr->ip_sum = inet_checksum(hdr, 20, ~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, 8 + oldlen, ~0);
-
- packet->len = 14 + 20 + 8 + oldlen;
-
- write_packet(packet);
-}
-
-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) {
- logger(DEBUG_TRAFFIC, 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;
-}
-
-#ifdef HAVE_NETINET_IP6_H
-
-/* RFC 2463 */
-
-void route_ipv6_unreachable(vpn_packet_t *packet, uint8_t code)
-{
- struct ip6_hdr *hdr;
- struct icmp6_hdr *icmp;
- 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())
- return;
-
- cp();
-
- hdr = (struct ip6_hdr *)(packet->data + 14);
- icmp = (struct icmp6_hdr *)(packet->data + 14 + sizeof(*hdr));
-
- /* Remember original source and destination */
-
- memcpy(&pseudo.ip6_src, &hdr->ip6_dst, 16);
- memcpy(&pseudo.ip6_dst, &hdr->ip6_src, 16);
- pseudo.length = ntohs(hdr->ip6_plen) + sizeof(*hdr);
-
- if(pseudo.length >= IP_MSS - sizeof(*hdr) - sizeof(*icmp))
- pseudo.length = IP_MSS - sizeof(*hdr) - sizeof(*icmp);
-
- /* Copy first part of original contents to ICMP message */
-
- memmove(((char *)icmp) + sizeof(*icmp), hdr, pseudo.length);
-
- /* Fill in IPv6 header */
-
- hdr->ip6_flow = htonl(0x60000000UL);
- hdr->ip6_plen = htons(sizeof(*icmp) + pseudo.length);
- hdr->ip6_nxt = IPPROTO_ICMPV6;
- hdr->ip6_hlim = 255;
- memcpy(&hdr->ip6_dst, &pseudo.ip6_dst, 16);
- memcpy(&hdr->ip6_src, &pseudo.ip6_src, 16);
-
- /* Fill in ICMP header */
-
- icmp->icmp6_type = ICMP6_DST_UNREACH;
- icmp->icmp6_code = code;
- icmp->icmp6_cksum = 0;
-
- /* Create pseudo header */
-
- pseudo.length = htonl(sizeof(*icmp) + pseudo.length);
- pseudo.next = htonl(IPPROTO_ICMPV6);
-
- /* Generate checksum */
-
- checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0);
- checksum = inet_checksum(icmp, ntohl(pseudo.length), checksum);
-
- icmp->icmp6_cksum = checksum;
-
- packet->len = 14 + sizeof(*hdr) + ntohl(pseudo.length);
-
- write_packet(packet);
-}
-
-#endif
-
-node_t *route_ipv6(vpn_packet_t *packet)
-{
- subnet_t *subnet;
-
- cp();
-
- subnet = lookup_subnet_ipv6((ipv6_t *) & packet->data[38]);
-
- if(!subnet) {
- logger(DEBUG_TRAFFIC, 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]));
-#ifdef HAVE_NETINET_IP6_H
- route_ipv6_unreachable(packet, ICMP6_DST_UNREACH_ADDR);
-#endif
-
- return NULL;