slirp/ip6_input.c

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