nd6_rtr.c

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    1 /*      $OpenBSD: nd6_rtr.c,v 1.169 2022/12/10 21:26:21 kn Exp $        */
    2 /*      $KAME: nd6_rtr.c,v 1.97 2001/02/07 11:09:13 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/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/timeout.h>
   36 #include <sys/malloc.h>
   37 #include <sys/mbuf.h>
   38 #include <sys/socket.h>
   39 #include <sys/sockio.h>
   40 #include <sys/time.h>
   41 #include <sys/kernel.h>
   42 #include <sys/errno.h>
   43 #include <sys/ioctl.h>
   44 #include <sys/syslog.h>
   45 #include <sys/queue.h>
   46 
   47 #include <net/if.h>
   48 #include <net/if_dl.h>
   49 #include <net/if_var.h>
   50 #include <net/route.h>
   51 #include <net/rtable.h>
   52 
   53 #include <netinet/in.h>
   54 #include <netinet6/in6_var.h>
   55 #include <netinet/ip6.h>
   56 #include <netinet6/ip6_var.h>
   57 #include <netinet6/nd6.h>
   58 #include <netinet/icmp6.h>
   59 
   60 int rt6_deleteroute(struct rtentry *, void *, unsigned int);
   61 
   62 /*
   63  * Process Source Link-layer Address Options from 
   64  * Router Solicitation / Advertisement Messages.
   65  */
   66 void
   67 nd6_rtr_cache(struct mbuf *m, int off, int icmp6len, int icmp6_type)
   68 {
   69         struct ifnet *ifp;
   70         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
   71         struct nd_router_solicit *nd_rs;
   72         struct nd_router_advert *nd_ra;
   73         struct in6_addr saddr6 = ip6->ip6_src;
   74         char *lladdr = NULL;
   75         int lladdrlen = 0;
   76         struct nd_opts ndopts;
   77         char src[INET6_ADDRSTRLEN], dst[INET6_ADDRSTRLEN];
   78 
   79         KASSERT(icmp6_type == ND_ROUTER_SOLICIT || icmp6_type ==
   80             ND_ROUTER_ADVERT);
   81 
   82         /* Sanity checks */
   83         if (ip6->ip6_hlim != 255) {
   84                 nd6log((LOG_ERR,
   85                     "%s: invalid hlim (%d) from %s to %s on %u\n",
   86                     __func__, ip6->ip6_hlim,
   87                     inet_ntop(AF_INET6, &ip6->ip6_src, src, sizeof(src)),
   88                     inet_ntop(AF_INET6, &ip6->ip6_dst, dst, sizeof(dst)),
   89                     m->m_pkthdr.ph_ifidx));
   90                 goto bad;
   91         }
   92 
   93         switch (icmp6_type) {
   94         case ND_ROUTER_SOLICIT:
   95                 /*
   96                  * Don't update the neighbor cache, if src = ::.
   97                  * This indicates that the src has no IP address assigned yet.
   98                  */
   99                 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
  100                         goto freeit;
  101 
  102                 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off,
  103                     icmp6len);
  104                 if (nd_rs == NULL) {
  105                         icmp6stat_inc(icp6s_tooshort);
  106                         return;
  107                 }
  108 
  109                 icmp6len -= sizeof(*nd_rs);
  110                 if (nd6_options(nd_rs + 1, icmp6len, &ndopts) < 0) {
  111                         nd6log((LOG_INFO,
  112                             "%s: invalid ND option, ignored\n", __func__));
  113                         /* nd6_options have incremented stats */
  114                         goto freeit;
  115                 }
  116                 break;
  117         case ND_ROUTER_ADVERT:
  118                 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
  119                         nd6log((LOG_ERR,
  120                             "%s: src %s is not link-local\n", __func__,
  121                             inet_ntop(AF_INET6, &saddr6, src, sizeof(src))));
  122                         goto bad;
  123                 }
  124 
  125                 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off,
  126                     icmp6len);
  127                 if (nd_ra == NULL) {
  128                         icmp6stat_inc(icp6s_tooshort);
  129                         return;
  130                 }
  131 
  132                 icmp6len -= sizeof(*nd_ra);
  133                 if (nd6_options(nd_ra + 1, icmp6len, &ndopts) < 0) {
  134                         nd6log((LOG_INFO,
  135                             "%s: invalid ND option, ignored\n", __func__));
  136                         /* nd6_options have incremented stats */
  137                         goto freeit;
  138                 }
  139                 break;
  140         }
  141 
  142         if (ndopts.nd_opts_src_lladdr) {
  143                 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
  144                 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
  145         }
  146 
  147         ifp = if_get(m->m_pkthdr.ph_ifidx);
  148         if (ifp == NULL)
  149                 goto freeit;
  150 
  151         if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
  152                 nd6log((LOG_INFO,
  153                     "%s: lladdrlen mismatch for %s (if %d, RA/RS packet %d)\n",
  154                      __func__, inet_ntop(AF_INET6, &saddr6, src, sizeof(src)),
  155                     ifp->if_addrlen, lladdrlen - 2));
  156                 if_put(ifp);
  157                 goto bad;
  158         }
  159 
  160         nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, icmp6_type, 0);
  161         if_put(ifp);
  162 
  163  freeit:
  164         m_freem(m);
  165         return;
  166 
  167  bad:
  168         icmp6stat_inc(icmp6_type == ND_ROUTER_SOLICIT ? icp6s_badrs :
  169             icp6s_badra);
  170         m_freem(m);
  171 }
  172 
  173 /*
  174  * Delete all the routing table entries that use the specified gateway.
  175  * XXX: this function causes search through all entries of routing table, so
  176  * it shouldn't be called when acting as a router.
  177  * The gateway must already contain KAME's hack for link-local scope.
  178  */
  179 int
  180 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
  181 {
  182         struct rt_addrinfo info;
  183         struct sockaddr_in6 sa_mask;
  184         struct rtentry *rt = NULL;
  185         int error;
  186 
  187         NET_ASSERT_LOCKED();
  188 
  189         /* We'll care only link-local addresses */
  190         if (!IN6_IS_ADDR_LINKLOCAL(gateway))
  191                 return (0);
  192 
  193         KASSERT(gateway->s6_addr16[1] != 0);
  194 
  195         do {
  196                 error = rtable_walk(ifp->if_rdomain, AF_INET6, &rt,
  197                     rt6_deleteroute, gateway);
  198                 if (rt != NULL && error == EEXIST) {
  199                         memset(&info, 0, sizeof(info));
  200                         info.rti_flags =  rt->rt_flags;
  201                         info.rti_info[RTAX_DST] = rt_key(rt);
  202                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
  203                         info.rti_info[RTAX_NETMASK] = rt_plen2mask(rt,
  204                             &sa_mask);
  205                         error = rtrequest_delete(&info, RTP_ANY, ifp, NULL,
  206                             ifp->if_rdomain);
  207                         if (error == 0)
  208                                 error = EAGAIN;
  209                 }
  210                 rtfree(rt);
  211                 rt = NULL;
  212         } while (error == EAGAIN);
  213 
  214         return (error);
  215 }
  216 
  217 int
  218 rt6_deleteroute(struct rtentry *rt, void *arg, unsigned int id)
  219 {
  220         struct in6_addr *gate = (struct in6_addr *)arg;
  221 
  222         if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
  223                 return (0);
  224 
  225         if (!IN6_ARE_ADDR_EQUAL(gate, &satosin6(rt->rt_gateway)->sin6_addr))
  226                 return (0);
  227 
  228         /*
  229          * Do not delete a static route.
  230          * XXX: this seems to be a bit ad-hoc. Should we consider the
  231          * 'cloned' bit instead?
  232          */
  233         if ((rt->rt_flags & RTF_STATIC) != 0)
  234                 return (0);
  235 
  236         /*
  237          * We delete only host route. This means, in particular, we don't
  238          * delete default route.
  239          */
  240         if ((rt->rt_flags & RTF_HOST) == 0)
  241                 return (0);
  242 
  243         return (EEXIST);
  244 }

Cache object: 615ec7e2d9123d83b501a8ec85f68df9

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

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