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/net/if_gre.h

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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  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   28  * POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * $NetBSD: if_gre.h,v 1.13 2003/11/10 08:51:52 wiz Exp $
   31  * $FreeBSD$
   32  */
   33 
   34 #ifndef _NET_IF_GRE_H_
   35 #define _NET_IF_GRE_H_
   36 
   37 #ifdef _KERNEL
   38 /* GRE header according to RFC 2784 and RFC 2890 */
   39 struct grehdr {
   40         uint16_t        gre_flags;      /* GRE flags */
   41 #define GRE_FLAGS_CP    0x8000          /* checksum present */
   42 #define GRE_FLAGS_KP    0x2000          /* key present */
   43 #define GRE_FLAGS_SP    0x1000          /* sequence present */
   44 #define GRE_FLAGS_MASK  (GRE_FLAGS_CP|GRE_FLAGS_KP|GRE_FLAGS_SP)
   45         uint16_t        gre_proto;      /* protocol type */
   46         uint32_t        gre_opts[0];    /* optional fields */
   47 } __packed;
   48 
   49 #ifdef INET
   50 struct greip {
   51         struct ip       gi_ip;
   52         struct grehdr   gi_gre;
   53 } __packed;
   54 #endif
   55 
   56 #ifdef INET6
   57 struct greip6 {
   58         struct ip6_hdr  gi6_ip6;
   59         struct grehdr   gi6_gre;
   60 } __packed;
   61 #endif
   62 
   63 struct gre_softc {
   64         struct ifnet            *gre_ifp;
   65         LIST_ENTRY(gre_softc)   gre_list;
   66         struct rmlock           gre_lock;
   67         int                     gre_family;     /* AF of delivery header */
   68         uint32_t                gre_iseq;
   69         uint32_t                gre_oseq;
   70         uint32_t                gre_key;
   71         uint32_t                gre_options;
   72         u_int                   gre_fibnum;
   73         u_int                   gre_hlen;       /* header size */
   74         union {
   75                 void            *hdr;
   76 #ifdef INET
   77                 struct greip    *gihdr;
   78 #endif
   79 #ifdef INET6
   80                 struct greip6   *gi6hdr;
   81 #endif
   82         } gre_uhdr;
   83         const struct encaptab   *gre_ecookie;
   84 };
   85 #define GRE2IFP(sc)             ((sc)->gre_ifp)
   86 #define GRE_LOCK_INIT(sc)       rm_init(&(sc)->gre_lock, "gre softc")
   87 #define GRE_LOCK_DESTROY(sc)    rm_destroy(&(sc)->gre_lock)
   88 #define GRE_RLOCK_TRACKER       struct rm_priotracker gre_tracker
   89 #define GRE_RLOCK(sc)           rm_rlock(&(sc)->gre_lock, &gre_tracker)
   90 #define GRE_RUNLOCK(sc)         rm_runlock(&(sc)->gre_lock, &gre_tracker)
   91 #define GRE_RLOCK_ASSERT(sc)    rm_assert(&(sc)->gre_lock, RA_RLOCKED)
   92 #define GRE_WLOCK(sc)           rm_wlock(&(sc)->gre_lock)
   93 #define GRE_WUNLOCK(sc)         rm_wunlock(&(sc)->gre_lock)
   94 #define GRE_WLOCK_ASSERT(sc)    rm_assert(&(sc)->gre_lock, RA_WLOCKED)
   95 
   96 #define gre_hdr                 gre_uhdr.hdr
   97 #define gre_gihdr               gre_uhdr.gihdr
   98 #define gre_gi6hdr              gre_uhdr.gi6hdr
   99 #define gre_oip                 gre_gihdr->gi_ip
  100 #define gre_oip6                gre_gi6hdr->gi6_ip6
  101 
  102 int     gre_input(struct mbuf **, int *, int);
  103 #ifdef INET
  104 int     in_gre_attach(struct gre_softc *);
  105 int     in_gre_output(struct mbuf *, int, int);
  106 #endif
  107 #ifdef INET6
  108 int     in6_gre_attach(struct gre_softc *);
  109 int     in6_gre_output(struct mbuf *, int, int);
  110 #endif
  111 /*
  112  * CISCO uses special type for GRE tunnel created as part of WCCP
  113  * connection, while in fact those packets are just IPv4 encapsulated
  114  * into GRE.
  115  */
  116 #define ETHERTYPE_WCCP          0x883E
  117 #endif /* _KERNEL */
  118 
  119 #define GRESADDRS       _IOW('i', 101, struct ifreq)
  120 #define GRESADDRD       _IOW('i', 102, struct ifreq)
  121 #define GREGADDRS       _IOWR('i', 103, struct ifreq)
  122 #define GREGADDRD       _IOWR('i', 104, struct ifreq)
  123 #define GRESPROTO       _IOW('i' , 105, struct ifreq)
  124 #define GREGPROTO       _IOWR('i', 106, struct ifreq)
  125 
  126 #define GREGKEY         _IOWR('i', 107, struct ifreq)
  127 #define GRESKEY         _IOW('i', 108, struct ifreq)
  128 #define GREGOPTS        _IOWR('i', 109, struct ifreq)
  129 #define GRESOPTS        _IOW('i', 110, struct ifreq)
  130 
  131 #define GRE_ENABLE_CSUM         0x0001
  132 #define GRE_ENABLE_SEQ          0x0002
  133 #define GRE_OPTMASK             (GRE_ENABLE_CSUM|GRE_ENABLE_SEQ)
  134 
  135 #endif /* _NET_IF_GRE_H_ */

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