nd6_rtr.c

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    1 /*      $NetBSD: nd6_rtr.c,v 1.149 2020/06/12 11:04:45 roy Exp $        */
    2 /*      $KAME: nd6_rtr.c,v 1.95 2001/02/07 08:09:47 itojun Exp $        */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __KERNEL_RCSID(0, "$NetBSD: nd6_rtr.c,v 1.149 2020/06/12 11:04:45 roy Exp $");
   35 
   36 #ifdef _KERNEL_OPT
   37 #include "opt_net_mpsafe.h"
   38 #endif
   39 
   40 #include <sys/mbuf.h>
   41 #include <sys/syslog.h>
   42 
   43 #include <net/if.h>
   44 
   45 #include <netinet/in.h>
   46 #include <netinet6/in6_var.h>
   47 #include <netinet/ip6.h>
   48 #include <netinet6/nd6.h>
   49 #include <netinet/icmp6.h>
   50 #include <netinet6/icmp6_private.h>
   51 
   52 /*
   53  * Cache the source link layer address of Router Advertisement
   54  * and Solicition messages.
   55  */
   56 void
   57 nd6_rtr_cache(struct mbuf *m, int off, int icmp6len, int icmp6_type)
   58 {
   59         struct ifnet *ifp;
   60         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
   61         struct nd_router_solicit *nd_rs;
   62         struct nd_router_advert *nd_ra;
   63         struct in6_addr saddr6 = ip6->ip6_src;
   64         char *lladdr = NULL;
   65         int lladdrlen = 0;
   66         union nd_opts ndopts;
   67         struct psref psref;
   68         char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
   69 
   70         ifp = m_get_rcvif_psref(m, &psref);
   71         if (ifp == NULL)
   72                 goto freeit;
   73 
   74         /* Sanity checks */
   75         if (ip6->ip6_hlim != 255) {
   76                 nd6log(LOG_ERR, "invalid hlim (%d) from %s to %s on %s\n",
   77                     ip6->ip6_hlim, IN6_PRINT(ip6bufs, &ip6->ip6_src),
   78                     IN6_PRINT(ip6bufd, &ip6->ip6_dst), if_name(ifp));
   79                 goto bad;
   80         }
   81 
   82         switch (icmp6_type) {
   83         case ND_ROUTER_SOLICIT:
   84                 /*
   85                  * Don't update the neighbor cache, if src = ::.
   86                  * This indicates that the src has no IP address assigned yet.
   87                  */
   88                 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
   89                         goto freeit;
   90 
   91                 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off,
   92                     icmp6len);
   93                 if (nd_rs == NULL) {
   94                         ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
   95                         m_put_rcvif_psref(ifp, &psref);
   96                         return;
   97                 }
   98 
   99                 icmp6len -= sizeof(*nd_rs);
  100                 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
  101                 break;
  102         case ND_ROUTER_ADVERT:
  103                 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
  104                         nd6log(LOG_ERR, "src %s is not link-local\n",
  105                             IN6_PRINT(ip6bufs, &saddr6));
  106                         goto bad;
  107                 }
  108 
  109                 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off,
  110                     icmp6len);
  111                 if (nd_ra == NULL) {
  112                         ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
  113                         m_put_rcvif_psref(ifp, &psref);
  114                         return;
  115                 }
  116 
  117                 icmp6len -= sizeof(*nd_ra);
  118                 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
  119                 break;
  120         }
  121 
  122         if (nd6_options(&ndopts) < 0) {
  123                 nd6log(LOG_INFO, "invalid ND option, ignored\n");
  124                 /* nd6_options have incremented stats */
  125                 goto freeit;
  126         }
  127 
  128         if (ndopts.nd_opts_src_lladdr) {
  129                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  130                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  131         }
  132 
  133         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  134                 nd6log(LOG_INFO, "lladdrlen mismatch for %s "
  135                     "(if %d, %s packet %d)\n",
  136                     IN6_PRINT(ip6bufs, &saddr6),
  137                     ifp->if_addrlen,
  138                     icmp6_type == ND_ROUTER_SOLICIT ? "RS" : "RA",
  139                     lladdrlen - 2);
  140                 goto bad;
  141         }
  142 
  143         nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, icmp6_type, 0);
  144 
  145 freeit:
  146         m_put_rcvif_psref(ifp, &psref);
  147         m_freem(m);
  148         return;
  149 
  150 bad:
  151         ICMP6_STATINC(icmp6_type == ND_ROUTER_SOLICIT ?
  152             ICMP6_STAT_BADRS : ICMP6_STAT_BADRA);
  153         m_put_rcvif_psref(ifp, &psref);
  154         m_freem(m);
  155 }

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FreeBSD/Linux Kernel Cross Reference sys/netinet6/nd6_rtr.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/nd6_rtr.c