slirp/ip6_input.c

   1 /*
   2  * Copyright (c) 2013
   3  * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
   4  */
   5
   6 #include "slirp.h"
   7 #include "ip6_icmp.h"
   8
   9 /*
  10  * IP initialization: fill in IP protocol switch table.
  11  * All protocols not implemented in kernel go to raw IP protocol handler.
  12  */
  13 void ip6_init(Slirp *slirp)
  14 {
  15     icmp6_init(slirp);
  16 }
  17
  18 void ip6_cleanup(Slirp *slirp)
  19 {
  20     icmp6_cleanup(slirp);
  21 }
  22
  23 void ip6_input(struct mbuf *m)
  24 {
  25     struct ip6 *ip6;
  26     Slirp *slirp = m->slirp;
  27
  28     if (!slirp->in6_enabled) {
  29         goto bad;
  30     }
  31
  32     DEBUG_CALL("ip6_input");
  33     DEBUG_ARG("m = %p", m);
  34     DEBUG_ARG("m_len = %d", m->m_len);
  35
  36     if (m->m_len < sizeof(struct ip6)) {
  37         goto bad;
  38     }
  39
  40     ip6 = mtod(m, struct ip6 *);
  41
  42     if (ip6->ip_v != IP6VERSION) {
  43         goto bad;
  44     }
  45
  46     if (ntohs(ip6->ip_pl) > IF_MTU) {
  47         icmp6_send_error(m, ICMP6_TOOBIG, 0);
  48         goto bad;
  49     }
  50
  51     /* check ip_ttl for a correct ICMP reply */
  52     if (ip6->ip_hl == 0) {
  53         icmp6_send_error(m, ICMP6_TIMXCEED, ICMP6_TIMXCEED_INTRANS);
  54         goto bad;
  55     }
  56
  57     /*
  58      * Switch out to protocol's input routine.
  59      */
  60     switch (ip6->ip_nh) {
  61     case IPPROTO_TCP:
  62         NTOHS(ip6->ip_pl);
  63         tcp_input(m, sizeof(struct ip6), (struct socket *)NULL, AF_INET6);
  64         break;
  65     case IPPROTO_UDP:
  66         udp6_input(m);
  67         break;
  68     case IPPROTO_ICMPV6:
  69         icmp6_input(m);
  70         break;
  71     default:
  72         m_free(m);
  73     }
  74     return;
  75 bad:
  76     m_free(m);
  77 }