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/netinet/ip_gre.c

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    1 /*-
    2  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    3  * Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
    4  * All rights reserved.
    5  *
    6  * This code is derived from software contributed to The NetBSD Foundation
    7  * by Heiko W.Rupp <hwr@pilhuhn.de>
    8  *
    9  * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de>
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  *
   32  * $NetBSD: ip_gre.c,v 1.29 2003/09/05 23:02:43 itojun Exp $
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/11.2/sys/netinet/ip_gre.c 280971 2015-04-01 22:26:39Z glebius $");
   37 
   38 #include "opt_inet.h"
   39 #include "opt_inet6.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/socket.h>
   45 #include <sys/socketvar.h>
   46 #include <sys/protosw.h>
   47 #include <sys/errno.h>
   48 #include <sys/time.h>
   49 #include <sys/kernel.h>
   50 #include <sys/lock.h>
   51 #include <sys/rmlock.h>
   52 #include <sys/sysctl.h>
   53 #include <net/ethernet.h>
   54 #include <net/if.h>
   55 #include <net/if_var.h>
   56 #include <net/vnet.h>
   57 
   58 #include <netinet/in.h>
   59 #include <netinet/in_var.h>
   60 #include <netinet/ip.h>
   61 #include <netinet/ip_encap.h>
   62 #include <netinet/ip_var.h>
   63 
   64 #ifdef INET6
   65 #include <netinet/ip6.h>
   66 #endif
   67 
   68 #include <net/if_gre.h>
   69 
   70 extern struct domain inetdomain;
   71 static const struct protosw in_gre_protosw = {
   72         .pr_type =              SOCK_RAW,
   73         .pr_domain =            &inetdomain,
   74         .pr_protocol =          IPPROTO_GRE,
   75         .pr_flags =             PR_ATOMIC|PR_ADDR,
   76         .pr_input =             gre_input,
   77         .pr_output =            rip_output,
   78         .pr_ctlinput =          rip_ctlinput,
   79         .pr_ctloutput =         rip_ctloutput,
   80         .pr_usrreqs =           &rip_usrreqs
   81 };
   82 
   83 #define GRE_TTL                 30
   84 VNET_DEFINE(int, ip_gre_ttl) = GRE_TTL;
   85 #define V_ip_gre_ttl            VNET(ip_gre_ttl)
   86 SYSCTL_INT(_net_inet_ip, OID_AUTO, grettl, CTLFLAG_VNET | CTLFLAG_RW,
   87         &VNET_NAME(ip_gre_ttl), 0, "");
   88 
   89 static int
   90 in_gre_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
   91 {
   92         GRE_RLOCK_TRACKER;
   93         struct gre_softc *sc;
   94         struct ip *ip;
   95 
   96         sc = (struct gre_softc *)arg;
   97         if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
   98                 return (0);
   99 
  100         M_ASSERTPKTHDR(m);
  101         /*
  102          * We expect that payload contains at least IPv4
  103          * or IPv6 packet.
  104          */
  105         if (m->m_pkthdr.len < sizeof(struct greip) + sizeof(struct ip))
  106                 return (0);
  107 
  108         GRE_RLOCK(sc);
  109         if (sc->gre_family == 0)
  110                 goto bad;
  111 
  112         KASSERT(sc->gre_family == AF_INET,
  113             ("wrong gre_family: %d", sc->gre_family));
  114 
  115         ip = mtod(m, struct ip *);
  116         if (sc->gre_oip.ip_src.s_addr != ip->ip_dst.s_addr ||
  117             sc->gre_oip.ip_dst.s_addr != ip->ip_src.s_addr)
  118                 goto bad;
  119 
  120         GRE_RUNLOCK(sc);
  121         return (32 * 2);
  122 bad:
  123         GRE_RUNLOCK(sc);
  124         return (0);
  125 }
  126 
  127 int
  128 in_gre_output(struct mbuf *m, int af, int hlen)
  129 {
  130         struct greip *gi;
  131 
  132         gi = mtod(m, struct greip *);
  133         switch (af) {
  134         case AF_INET:
  135                 /*
  136                  * gre_transmit() has used M_PREPEND() that doesn't guarantee
  137                  * m_data is contiguous more than hlen bytes. Use m_copydata()
  138                  * here to avoid m_pullup().
  139                  */
  140                 m_copydata(m, hlen + offsetof(struct ip, ip_tos),
  141                     sizeof(u_char), &gi->gi_ip.ip_tos);
  142                 m_copydata(m, hlen + offsetof(struct ip, ip_id),
  143                     sizeof(u_short), (caddr_t)&gi->gi_ip.ip_id);
  144                 break;
  145 #ifdef INET6
  146         case AF_INET6:
  147                 gi->gi_ip.ip_tos = 0; /* XXX */
  148                 ip_fillid(&gi->gi_ip);
  149                 break;
  150 #endif
  151         }
  152         gi->gi_ip.ip_ttl = V_ip_gre_ttl;
  153         gi->gi_ip.ip_len = htons(m->m_pkthdr.len);
  154         return (ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL));
  155 }
  156 
  157 int
  158 in_gre_attach(struct gre_softc *sc)
  159 {
  160 
  161         KASSERT(sc->gre_ecookie == NULL, ("gre_ecookie isn't NULL"));
  162         sc->gre_ecookie = encap_attach_func(AF_INET, IPPROTO_GRE,
  163             in_gre_encapcheck, &in_gre_protosw, sc);
  164         if (sc->gre_ecookie == NULL)
  165                 return (EEXIST);
  166         return (0);
  167 }

Cache object: 77d6d83f5d1a774745a362f2cbd2feac


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