slirp/src/ip6_input.c

   1 /* SPDX-License-Identifier: BSD-3-Clause */
   2 /*
   3  * Copyright (c) 2013
   4  * Guillaume Subiron, Yann Bordenave, Serigne Modou Wagne.
   5  */
   6
   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     Slirp *slirp = m->slirp;
  28
  29     if (!slirp->in6_enabled) {
  30         goto bad;
  31     }
  32
  33     DEBUG_CALL("ip6_input");
  34     DEBUG_ARG("m = %p", m);
  35     DEBUG_ARG("m_len = %d", m->m_len);
  36
  37     if (m->m_len < sizeof(struct ip6)) {
  38         goto bad;
  39     }
  40
  41     ip6 = mtod(m, struct ip6 *);
  42
  43     if (ip6->ip_v != IP6VERSION) {
  44         goto bad;
  45     }
  46
  47     if (ntohs(ip6->ip_pl) > IF_MTU) {
  48         icmp6_send_error(m, ICMP6_TOOBIG, 0);
  49         goto bad;
  50     }
  51
  52     /* check ip_ttl for a correct ICMP reply */
  53     if (ip6->ip_hl == 0) {
  54         icmp6_send_error(m, ICMP6_TIMXCEED, ICMP6_TIMXCEED_INTRANS);
  55         goto bad;
  56     }
  57
  58     /*
  59      * Switch out to protocol's input routine.
  60      */
  61     switch (ip6->ip_nh) {
  62     case IPPROTO_TCP:
  63         NTOHS(ip6->ip_pl);
  64         tcp_input(m, sizeof(struct ip6), (struct socket *)NULL, AF_INET6);
  65         break;
  66     case IPPROTO_UDP:
  67         udp6_input(m);
  68         break;
  69     case IPPROTO_ICMPV6:
  70         icmp6_input(m);
  71         break;
  72     default:
  73         m_free(m);
  74     }
  75     return;
  76 bad:
  77     m_free(m);
  78 }