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/ip6_gre.c

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    1 /*-
    2  * Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
    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  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include "opt_inet.h"
   31 #include "opt_inet6.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/lock.h>
   35 #include <sys/rmlock.h>
   36 #include <sys/systm.h>
   37 #include <sys/socket.h>
   38 #include <sys/sockio.h>
   39 #include <sys/mbuf.h>
   40 #include <sys/errno.h>
   41 #include <sys/kernel.h>
   42 #include <sys/queue.h>
   43 #include <sys/syslog.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/protosw.h>
   46 #include <sys/malloc.h>
   47 
   48 #include <net/if.h>
   49 #include <net/if_var.h>
   50 #include <net/vnet.h>
   51 
   52 #include <netinet/in.h>
   53 #include <netinet/in_systm.h>
   54 #ifdef INET
   55 #include <net/ethernet.h>
   56 #include <netinet/ip.h>
   57 #endif
   58 #include <netinet/ip_encap.h>
   59 #include <netinet/ip6.h>
   60 #include <netinet6/ip6_var.h>
   61 #include <netinet6/in6_var.h>
   62 #include <net/if_gre.h>
   63 
   64 extern  struct domain inet6domain;
   65 struct protosw in6_gre_protosw = {
   66         .pr_type =      SOCK_RAW,
   67         .pr_domain =    &inet6domain,
   68         .pr_protocol =  IPPROTO_GRE,
   69         .pr_flags =     PR_ATOMIC|PR_ADDR,
   70         .pr_input =     gre_input,
   71         .pr_output =    rip6_output,
   72         .pr_ctloutput = rip6_ctloutput,
   73         .pr_usrreqs =   &rip6_usrreqs
   74 };
   75 
   76 VNET_DEFINE(int, ip6_gre_hlim) = IPV6_DEFHLIM;
   77 #define V_ip6_gre_hlim          VNET(ip6_gre_hlim)
   78 
   79 SYSCTL_DECL(_net_inet6_ip6);
   80 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, grehlim, CTLFLAG_VNET | CTLFLAG_RW,
   81     &VNET_NAME(ip6_gre_hlim), 0, "Default hop limit for encapsulated packets");
   82 
   83 static int
   84 in6_gre_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
   85 {
   86         GRE_RLOCK_TRACKER;
   87         struct gre_softc *sc;
   88         struct ip6_hdr *ip6;
   89 
   90         sc = (struct gre_softc *)arg;
   91         if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
   92                 return (0);
   93 
   94         M_ASSERTPKTHDR(m);
   95         /*
   96          * We expect that payload contains at least IPv4
   97          * or IPv6 packet.
   98          */
   99         if (m->m_pkthdr.len < sizeof(struct greip6) +
  100 #ifdef INET
  101             sizeof(struct ip))
  102 #else
  103             sizeof(struct ip6_hdr))
  104 #endif
  105                 return (0);
  106 
  107         GRE_RLOCK(sc);
  108         if (sc->gre_family == 0)
  109                 goto bad;
  110 
  111         KASSERT(sc->gre_family == AF_INET6,
  112             ("wrong gre_family: %d", sc->gre_family));
  113 
  114         ip6 = mtod(m, struct ip6_hdr *);
  115         if (!IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src, &ip6->ip6_dst) ||
  116             !IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst, &ip6->ip6_src))
  117                 goto bad;
  118 
  119         GRE_RUNLOCK(sc);
  120         return (128 * 2);
  121 bad:
  122         GRE_RUNLOCK(sc);
  123         return (0);
  124 }
  125 
  126 int
  127 in6_gre_output(struct mbuf *m, int af, int hlen)
  128 {
  129         struct greip6 *gi6;
  130 
  131         gi6 = mtod(m, struct greip6 *);
  132         gi6->gi6_ip6.ip6_hlim = V_ip6_gre_hlim;
  133         return (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, NULL));
  134 }
  135 
  136 int
  137 in6_gre_attach(struct gre_softc *sc)
  138 {
  139 
  140         KASSERT(sc->gre_ecookie == NULL, ("gre_ecookie isn't NULL"));
  141         sc->gre_ecookie = encap_attach_func(AF_INET6, IPPROTO_GRE,
  142             in6_gre_encapcheck, &in6_gre_protosw, sc);
  143         if (sc->gre_ecookie == NULL)
  144                 return (EEXIST);
  145         return (0);
  146 }

Cache object: 3c426cdb454f4f42da297d9f8284ab87


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