The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_gif.c

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    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: stable/10/sys/netinet6/in6_gif.c 284072 2015-06-06 13:26:13Z ae $");
   34 
   35 #include "opt_inet.h"
   36 #include "opt_inet6.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/lock.h>
   40 #include <sys/rmlock.h>
   41 #include <sys/systm.h>
   42 #include <sys/socket.h>
   43 #include <sys/sockio.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/errno.h>
   46 #include <sys/kernel.h>
   47 #include <sys/queue.h>
   48 #include <sys/syslog.h>
   49 #include <sys/sysctl.h>
   50 #include <sys/protosw.h>
   51 #include <sys/malloc.h>
   52 
   53 #include <net/if.h>
   54 #include <net/if_var.h>
   55 #include <net/route.h>
   56 #include <net/vnet.h>
   57 
   58 #include <netinet/in.h>
   59 #include <netinet/in_systm.h>
   60 #ifdef INET
   61 #include <netinet/ip.h>
   62 #endif
   63 #include <netinet/ip_encap.h>
   64 #ifdef INET6
   65 #include <netinet/ip6.h>
   66 #include <netinet6/ip6_var.h>
   67 #include <netinet6/in6_var.h>
   68 #endif
   69 #include <netinet6/ip6protosw.h>
   70 #include <netinet/ip_ecn.h>
   71 #ifdef INET6
   72 #include <netinet6/ip6_ecn.h>
   73 #endif
   74 
   75 #include <net/if_gif.h>
   76 
   77 #define GIF_HLIM        30
   78 static VNET_DEFINE(int, ip6_gif_hlim) = GIF_HLIM;
   79 #define V_ip6_gif_hlim                  VNET(ip6_gif_hlim)
   80 
   81 SYSCTL_DECL(_net_inet6_ip6);
   82 SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_RW,
   83     &VNET_NAME(ip6_gif_hlim), 0, "");
   84 
   85 static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
   86                          struct ifnet *);
   87 static int in6_gif_input(struct mbuf **, int *, int);
   88 
   89 extern  struct domain inet6domain;
   90 static struct ip6protosw in6_gif_protosw = {
   91         .pr_type =      SOCK_RAW,
   92         .pr_domain =    &inet6domain,
   93         .pr_protocol =  0,                      /* IPPROTO_IPV[46] */
   94         .pr_flags =     PR_ATOMIC|PR_ADDR,
   95         .pr_input =     in6_gif_input,
   96         .pr_output =    rip6_output,
   97         .pr_ctloutput = rip6_ctloutput,
   98         .pr_usrreqs =   &rip6_usrreqs
   99 };
  100 
  101 int
  102 in6_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
  103 {
  104         GIF_RLOCK_TRACKER;
  105         struct gif_softc *sc = ifp->if_softc;
  106         struct ip6_hdr *ip6;
  107         int len;
  108 
  109         /* prepend new IP header */
  110         len = sizeof(struct ip6_hdr);
  111 #ifndef __NO_STRICT_ALIGNMENT
  112         if (proto == IPPROTO_ETHERIP)
  113                 len += ETHERIP_ALIGN;
  114 #endif
  115         M_PREPEND(m, len, M_NOWAIT);
  116         if (m == NULL)
  117                 return (ENOBUFS);
  118 #ifndef __NO_STRICT_ALIGNMENT
  119         if (proto == IPPROTO_ETHERIP) {
  120                 len = mtod(m, vm_offset_t) & 3;
  121                 KASSERT(len == 0 || len == ETHERIP_ALIGN,
  122                     ("in6_gif_output: unexpected misalignment"));
  123                 m->m_data += len;
  124                 m->m_len -= ETHERIP_ALIGN;
  125         }
  126 #endif
  127 
  128         ip6 = mtod(m, struct ip6_hdr *);
  129         GIF_RLOCK(sc);
  130         if (sc->gif_family != AF_INET6) {
  131                 m_freem(m);
  132                 GIF_RUNLOCK(sc);
  133                 return (ENETDOWN);
  134         }
  135         bcopy(sc->gif_ip6hdr, ip6, sizeof(struct ip6_hdr));
  136         GIF_RUNLOCK(sc);
  137 
  138         ip6->ip6_flow  |= htonl((uint32_t)ecn << 20);
  139         ip6->ip6_nxt    = proto;
  140         ip6->ip6_hlim   = V_ip6_gif_hlim;
  141         /*
  142          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  143          * it is too painful to ask for resend of inner packet, to achieve
  144          * path MTU discovery for encapsulated packets.
  145          */
  146         return (ip6_output(m, 0, NULL, IPV6_MINMTU, 0, NULL, NULL));
  147 }
  148 
  149 static int
  150 in6_gif_input(struct mbuf **mp, int *offp, int proto)
  151 {
  152         struct mbuf *m = *mp;
  153         struct ifnet *gifp;
  154         struct gif_softc *sc;
  155         struct ip6_hdr *ip6;
  156         uint8_t ecn;
  157 
  158         sc = encap_getarg(m);
  159         if (sc == NULL) {
  160                 m_freem(m);
  161                 IP6STAT_INC(ip6s_nogif);
  162                 return (IPPROTO_DONE);
  163         }
  164         gifp = GIF2IFP(sc);
  165         if ((gifp->if_flags & IFF_UP) != 0) {
  166                 ip6 = mtod(m, struct ip6_hdr *);
  167                 ecn = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  168                 m_adj(m, *offp);
  169                 gif_input(m, gifp, proto, ecn);
  170         } else {
  171                 m_freem(m);
  172                 IP6STAT_INC(ip6s_nogif);
  173         }
  174         return (IPPROTO_DONE);
  175 }
  176 
  177 /*
  178  * validate outer address.
  179  */
  180 static int
  181 gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
  182     struct ifnet *ifp)
  183 {
  184         int ret;
  185 
  186         GIF_RLOCK_ASSERT(sc);
  187         /*
  188          * Check for address match.  Note that the check is for an incoming
  189          * packet.  We should compare the *source* address in our configuration
  190          * and the *destination* address of the packet, and vice versa.
  191          */
  192         if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_src, &ip6->ip6_dst))
  193                 return (0);
  194         ret = 128;
  195         if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_dst, &ip6->ip6_src)) {
  196                 if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0)
  197                         return (0);
  198         } else
  199                 ret += 128;
  200 
  201         /* martian filters on outer source - done in ip6_input */
  202 
  203         /* ingress filters on outer source */
  204         if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
  205                 struct sockaddr_in6 sin6;
  206                 struct rtentry *rt;
  207 
  208                 bzero(&sin6, sizeof(sin6));
  209                 sin6.sin6_family = AF_INET6;
  210                 sin6.sin6_len = sizeof(struct sockaddr_in6);
  211                 sin6.sin6_addr = ip6->ip6_src;
  212                 sin6.sin6_scope_id = 0; /* XXX */
  213 
  214                 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL,
  215                     sc->gif_fibnum);
  216                 if (!rt || rt->rt_ifp != ifp) {
  217                         if (rt)
  218                                 RTFREE_LOCKED(rt);
  219                         return (0);
  220                 }
  221                 RTFREE_LOCKED(rt);
  222         }
  223 
  224         return (ret);
  225 }
  226 
  227 /*
  228  * we know that we are in IFF_UP, outer address available, and outer family
  229  * matched the physical addr family.  see gif_encapcheck().
  230  */
  231 int
  232 in6_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
  233 {
  234         struct ip6_hdr ip6;
  235         struct gif_softc *sc;
  236         struct ifnet *ifp;
  237 
  238         /* sanity check done in caller */
  239         sc = (struct gif_softc *)arg;
  240         GIF_RLOCK_ASSERT(sc);
  241 
  242         m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
  243         ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
  244         return (gif_validate6(&ip6, sc, ifp));
  245 }
  246 
  247 int
  248 in6_gif_attach(struct gif_softc *sc)
  249 {
  250 
  251         KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
  252         sc->gif_ecookie = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  253             (void *)&in6_gif_protosw, sc);
  254         if (sc->gif_ecookie == NULL)
  255                 return (EEXIST);
  256         return (0);
  257 }

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