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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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: releng/11.2/sys/netinet6/in6_gif.c 331722 2018-03-29 02:50:57Z eadler $");
   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 <netinet/ip_ecn.h>
   70 #ifdef INET6
   71 #include <netinet6/ip6_ecn.h>
   72 #include <netinet6/in6_fib.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_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_VNET | CTLFLAG_RW,
   83     &VNET_NAME(ip6_gif_hlim), 0, "");
   84 
   85 static int in6_gif_input(struct mbuf **, int *, int);
   86 
   87 extern  struct domain inet6domain;
   88 static struct protosw in6_gif_protosw = {
   89         .pr_type =      SOCK_RAW,
   90         .pr_domain =    &inet6domain,
   91         .pr_protocol =  0,                      /* IPPROTO_IPV[46] */
   92         .pr_flags =     PR_ATOMIC|PR_ADDR,
   93         .pr_input =     in6_gif_input,
   94         .pr_output =    rip6_output,
   95         .pr_ctloutput = rip6_ctloutput,
   96         .pr_usrreqs =   &rip6_usrreqs
   97 };
   98 
   99 int
  100 in6_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
  101 {
  102         GIF_RLOCK_TRACKER;
  103         struct gif_softc *sc = ifp->if_softc;
  104         struct ip6_hdr *ip6;
  105         int len;
  106 
  107         /* prepend new IP header */
  108         len = sizeof(struct ip6_hdr);
  109 #ifndef __NO_STRICT_ALIGNMENT
  110         if (proto == IPPROTO_ETHERIP)
  111                 len += ETHERIP_ALIGN;
  112 #endif
  113         M_PREPEND(m, len, M_NOWAIT);
  114         if (m == NULL)
  115                 return (ENOBUFS);
  116 #ifndef __NO_STRICT_ALIGNMENT
  117         if (proto == IPPROTO_ETHERIP) {
  118                 len = mtod(m, vm_offset_t) & 3;
  119                 KASSERT(len == 0 || len == ETHERIP_ALIGN,
  120                     ("in6_gif_output: unexpected misalignment"));
  121                 m->m_data += len;
  122                 m->m_len -= ETHERIP_ALIGN;
  123         }
  124 #endif
  125 
  126         ip6 = mtod(m, struct ip6_hdr *);
  127         GIF_RLOCK(sc);
  128         if (sc->gif_family != AF_INET6) {
  129                 m_freem(m);
  130                 GIF_RUNLOCK(sc);
  131                 return (ENETDOWN);
  132         }
  133         bcopy(sc->gif_ip6hdr, ip6, sizeof(struct ip6_hdr));
  134         GIF_RUNLOCK(sc);
  135 
  136         ip6->ip6_flow  |= htonl((uint32_t)ecn << 20);
  137         ip6->ip6_nxt    = proto;
  138         ip6->ip6_hlim   = V_ip6_gif_hlim;
  139         /*
  140          * force fragmentation to minimum MTU, to avoid path MTU discovery.
  141          * it is too painful to ask for resend of inner packet, to achieve
  142          * path MTU discovery for encapsulated packets.
  143          */
  144         return (ip6_output(m, 0, NULL, IPV6_MINMTU, 0, NULL, NULL));
  145 }
  146 
  147 static int
  148 in6_gif_input(struct mbuf **mp, int *offp, int proto)
  149 {
  150         struct mbuf *m = *mp;
  151         struct ifnet *gifp;
  152         struct gif_softc *sc;
  153         struct ip6_hdr *ip6;
  154         uint8_t ecn;
  155 
  156         sc = encap_getarg(m);
  157         if (sc == NULL) {
  158                 m_freem(m);
  159                 IP6STAT_INC(ip6s_nogif);
  160                 return (IPPROTO_DONE);
  161         }
  162         gifp = GIF2IFP(sc);
  163         if ((gifp->if_flags & IFF_UP) != 0) {
  164                 ip6 = mtod(m, struct ip6_hdr *);
  165                 ecn = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  166                 m_adj(m, *offp);
  167                 gif_input(m, gifp, proto, ecn);
  168         } else {
  169                 m_freem(m);
  170                 IP6STAT_INC(ip6s_nogif);
  171         }
  172         return (IPPROTO_DONE);
  173 }
  174 
  175 /*
  176  * we know that we are in IFF_UP, outer address available, and outer family
  177  * matched the physical addr family.  see gif_encapcheck().
  178  */
  179 int
  180 in6_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
  181 {
  182         const struct ip6_hdr *ip6;
  183         struct gif_softc *sc;
  184         int ret;
  185 
  186         /* sanity check done in caller */
  187         sc = (struct gif_softc *)arg;
  188         GIF_RLOCK_ASSERT(sc);
  189 
  190         /*
  191          * Check for address match.  Note that the check is for an incoming
  192          * packet.  We should compare the *source* address in our configuration
  193          * and the *destination* address of the packet, and vice versa.
  194          */
  195         ip6 = mtod(m, const struct ip6_hdr *);
  196         if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_src, &ip6->ip6_dst))
  197                 return (0);
  198         ret = 128;
  199         if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_dst, &ip6->ip6_src)) {
  200                 if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0)
  201                         return (0);
  202         } else
  203                 ret += 128;
  204 
  205         /* ingress filters on outer source */
  206         if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0) {
  207                 struct nhop6_basic nh6;
  208 
  209                 /* XXX empty scope id */
  210                 if (fib6_lookup_nh_basic(sc->gif_fibnum, &ip6->ip6_src, 0, 0, 0,
  211                     &nh6) != 0)
  212                         return (0);
  213 
  214                 if (nh6.nh_ifp != m->m_pkthdr.rcvif)
  215                         return (0);
  216         }
  217         return (ret);
  218 }
  219 
  220 int
  221 in6_gif_attach(struct gif_softc *sc)
  222 {
  223 
  224         KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
  225         sc->gif_ecookie = encap_attach_func(AF_INET6, -1, gif_encapcheck,
  226             (void *)&in6_gif_protosw, sc);
  227         if (sc->gif_ecookie == NULL)
  228                 return (EEXIST);
  229         return (0);
  230 }

Cache object: f929f6e51b740bef21083726f986b7c7


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.