sys/net/if_gre.h

   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         uint32_t                gre_mtu;
  73         u_int                   gre_fibnum;
  74         u_int                   gre_hlen;       /* header size */
  75         union {
  76                 void            *hdr;
  77 #ifdef INET
  78                 struct greip    *gihdr;
  79 #endif
  80 #ifdef INET6
  81                 struct greip6   *gi6hdr;
  82 #endif
  83         } gre_uhdr;
  84         const struct encaptab   *gre_ecookie;
  85 };
  86 #define GRE2IFP(sc)             ((sc)->gre_ifp)
  87 #define GRE_LOCK_INIT(sc)       rm_init(&(sc)->gre_lock, "gre softc")
  88 #define GRE_LOCK_DESTROY(sc)    rm_destroy(&(sc)->gre_lock)
  89 #define GRE_RLOCK_TRACKER       struct rm_priotracker gre_tracker
  90 #define GRE_RLOCK(sc)           rm_rlock(&(sc)->gre_lock, &gre_tracker)
  91 #define GRE_RUNLOCK(sc)         rm_runlock(&(sc)->gre_lock, &gre_tracker)
  92 #define GRE_RLOCK_ASSERT(sc)    rm_assert(&(sc)->gre_lock, RA_RLOCKED)
  93 #define GRE_WLOCK(sc)           rm_wlock(&(sc)->gre_lock)
  94 #define GRE_WUNLOCK(sc)         rm_wunlock(&(sc)->gre_lock)
  95 #define GRE_WLOCK_ASSERT(sc)    rm_assert(&(sc)->gre_lock, RA_WLOCKED)
  96
  97 #define gre_hdr                 gre_uhdr.hdr
  98 #define gre_gihdr               gre_uhdr.gihdr
  99 #define gre_gi6hdr              gre_uhdr.gi6hdr
 100 #define gre_oip                 gre_gihdr->gi_ip
 101 #define gre_oip6                gre_gi6hdr->gi6_ip6
 102
 103 int     gre_input(struct mbuf **, int *, int);
 104 #ifdef INET
 105 int     in_gre_attach(struct gre_softc *);
 106 int     in_gre_output(struct mbuf *, int, int);
 107 #endif
 108 #ifdef INET6
 109 int     in6_gre_attach(struct gre_softc *);
 110 int     in6_gre_output(struct mbuf *, int, int);
 111 #endif
 112 /*
 113  * CISCO uses special type for GRE tunnel created as part of WCCP
 114  * connection, while in fact those packets are just IPv4 encapsulated
 115  * into GRE.
 116  */
 117 #define ETHERTYPE_WCCP          0x883E
 118 #endif /* _KERNEL */
 119
 120 #define GRESADDRS       _IOW('i', 101, struct ifreq)
 121 #define GRESADDRD       _IOW('i', 102, struct ifreq)
 122 #define GREGADDRS       _IOWR('i', 103, struct ifreq)
 123 #define GREGADDRD       _IOWR('i', 104, struct ifreq)
 124 #define GRESPROTO       _IOW('i' , 105, struct ifreq)
 125 #define GREGPROTO       _IOWR('i', 106, struct ifreq)
 126
 127 #define GREGKEY         _IOWR('i', 107, struct ifreq)
 128 #define GRESKEY         _IOW('i', 108, struct ifreq)
 129 #define GREGOPTS        _IOWR('i', 109, struct ifreq)
 130 #define GRESOPTS        _IOW('i', 110, struct ifreq)
 131
 132 #define GRE_ENABLE_CSUM         0x0001
 133 #define GRE_ENABLE_SEQ          0x0002
 134 #define GRE_OPTMASK             (GRE_ENABLE_CSUM|GRE_ENABLE_SEQ)
 135
 136 #endif /* _NET_IF_GRE_H_ */