core/ipv4/ip.c

140  * @param iphdr the IP header of the input packet
144 static struct netif *ip_forward(struct pbuf *p, struct ip_hdr *iphdr,
151     netif = ip_route((struct ip_addr *) &(iphdr->dest));
155                      iphdr->dest.addr));
169     IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
171     if (IPH_TTL(iphdr) == 0) {
175         if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
183     if (IPH_CHKSUM(iphdr) >= htons(0xffff - 0x100)) {
184         IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100) + 1);
186         IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100));
190                            iphdr->dest.addr));
198     netif->output(netif, p, (struct ip_addr *) &(iphdr->dest));
219     struct ip_hdr *iphdr;
232     iphdr = p->payload;
233     if (IPH_V(iphdr) != 4) {
236                      IPH_V(iphdr)));
246     iphdr_hlen = IPH_HL(iphdr);
250     iphdr_len = ntohs(IPH_LEN(iphdr));
275     if (!hwcxs_good && inet_chksum(iphdr, iphdr_hlen) != 0) {
279                      inet_chksum(iphdr, iphdr_hlen)));
296     if (ip_addr_ismulticast(&(iphdr->dest))) {
298             && (igmp_lookfor_group(inp, &(iphdr->dest)))) {
314                         ("ip_input: iphdr->dest 0x%" X32_F " netif->ip_addr 0x%"
316                          iphdr->dest.addr, netif->ip_addr.addr,
317                          iphdr->dest.addr & netif->netmask.addr,
319                          iphdr->dest.addr & ~(netif->netmask.addr)));
324                 if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
326                     ip_addr_isbroadcast(&(iphdr->dest), netif)) {
353         if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
357                          ntohs(((struct udp_hdr *) ((u8_t *) iphdr +
359             if (ntohs(((struct udp_hdr *) ((u8_t *) iphdr + iphdr_hlen))->dest)
375         if ((ip_addr_isbroadcast(&(iphdr->src), inp)) ||
376             (ip_addr_ismulticast(&(iphdr->src)))) {
396         if (!ip_addr_isbroadcast(&(iphdr->dest), inp)) {
398             ip_forward(p, iphdr, inp);
409     if ((IPH_OFFSET(iphdr) & htons(IP_OFFMASK | IP_MF)) != 0) {
414                      "), calling ip_reass()\n", ntohs(IPH_ID(iphdr)),
415                      p->tot_len, ntohs(IPH_LEN(iphdr)),
416                      ! !(IPH_OFFSET(iphdr) & htons(IP_MF)),
417                      (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK) * 8));
424         iphdr = p->payload;
430                      ntohs(IPH_OFFSET(iphdr))));
442     if ((iphdr_hlen > IP_HLEN && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
465     current_header = iphdr;
473         switch (IPH_PROTO(iphdr)) {
497                 igmp_input(p, inp, &(iphdr->dest));
503                 if (!ip_addr_isbroadcast(&(iphdr->dest), inp) &&
504                     !ip_addr_ismulticast(&(iphdr->dest))) {
505                     p->payload = iphdr;
513                              IPH_PROTO(iphdr)));
571     struct ip_hdr *iphdr;
613         iphdr = p->payload;
617         IPH_TTL_SET(iphdr, ttl);
618         IPH_PROTO_SET(iphdr, proto);
620         ip_addr_set(&(iphdr->dest), dest);
622         IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
623         IPH_LEN_SET(iphdr, htons(p->tot_len));
624         IPH_OFFSET_SET(iphdr, 0);
625         IPH_ID_SET(iphdr, htons(ip_id));
629             ip_addr_set(&(iphdr->src), &(netif->ip_addr));
631             ip_addr_set(&(iphdr->src), src);
634         IPH_CHKSUM_SET(iphdr, 0);
639             IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
644         iphdr = p->payload;
645         dest = &(iphdr->dest);
755     struct ip_hdr *iphdr = p->payload;
758     payload = (u8_t *) iphdr + IP_HLEN;
764                  "     | (v, hl, tos, len)\n", IPH_V(iphdr), IPH_HL(iphdr),
765                  IPH_TOS(iphdr), ntohs(IPH_LEN(iphdr))));
769                  U16_F "   | (id, flags, offset)\n", ntohs(IPH_ID(iphdr)),
770                  ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
771                  ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
772                  ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
773                  ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
777                  "     | (ttl, proto, chksum)\n", IPH_TTL(iphdr),
778                  IPH_PROTO(iphdr), ntohs(IPH_CHKSUM(iphdr))));
782                  "  | (src)\n", ip4_addr1(&iphdr->src), ip4_addr2(&iphdr->src),
783                  ip4_addr3(&iphdr->src), ip4_addr4(&iphdr->src)));
787                  "  | (dest)\n", ip4_addr1(&iphdr->dest),
788                  ip4_addr2(&iphdr->dest), ip4_addr3(&iphdr->dest),
789                  ip4_addr4(&iphdr->dest)));