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 /*      $NetBSD: if_gre.h,v 1.13 2003/11/10 08:51:52 wiz Exp $ */
    2 /*       $FreeBSD: releng/7.3/sys/net/if_gre.h 181991 2008-08-22 03:55:37Z thompsa $ */
    3 
    4 /*-
    5  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    6  * All rights reserved
    7  *
    8  * This code is derived from software contributed to The NetBSD Foundation
    9  * by Heiko W.Rupp <hwr@pilhuhn.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  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *        This product includes software developed by the NetBSD
   22  *        Foundation, Inc. and its contributors.
   23  * 4. Neither the name of The NetBSD Foundation nor the names of its
   24  *    contributors may be used to endorse or promote products derived
   25  *    from this software without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   37  * POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 #ifndef _NET_IF_GRE_H
   41 #define _NET_IF_GRE_H
   42 
   43 #include <sys/ioccom.h>
   44 #ifdef _KERNEL
   45 #include <sys/queue.h>
   46 
   47 /*
   48  * Version of the WCCP, need to be configured manually since
   49  * header for version 2 is the same but IP payload is prepended
   50  * with additional 4-bytes field.
   51  */
   52 typedef enum {
   53         WCCP_V1 = 0,
   54         WCCP_V2
   55 } wccp_ver_t;
   56 
   57 struct gre_softc {
   58         struct ifnet *sc_ifp;
   59         LIST_ENTRY(gre_softc) sc_list;
   60         int gre_unit;
   61         int gre_flags;
   62         u_int   gre_fibnum;     /* use this fib for envelopes */
   63         struct in_addr g_src;   /* source address of gre packets */
   64         struct in_addr g_dst;   /* destination address of gre packets */
   65         struct route route;     /* routing entry that determines, where a
   66                                    encapsulated packet should go */
   67         u_char g_proto;         /* protocol of encapsulator */
   68 
   69         const struct encaptab *encap;   /* encapsulation cookie */
   70 
   71         int called;             /* infinite recursion preventer */
   72 
   73         uint32_t key;           /* key included in outgoing GRE packets */
   74                                 /* zero means none */
   75 
   76         wccp_ver_t wccp_ver;    /* version of the WCCP */
   77 };
   78 #define GRE2IFP(sc)     ((sc)->sc_ifp)
   79 
   80 
   81 struct gre_h {
   82         u_int16_t flags;        /* GRE flags */
   83         u_int16_t ptype;        /* protocol type of payload typically
   84                                    Ether protocol type*/
   85         uint32_t options[0];    /* optional options */
   86 /*
   87  *  from here on: fields are optional, presence indicated by flags
   88  *
   89         u_int_16 checksum       checksum (one-complements of GRE header
   90                                 and payload
   91                                 Present if (ck_pres | rt_pres == 1).
   92                                 Valid if (ck_pres == 1).
   93         u_int_16 offset         offset from start of routing filed to
   94                                 first octet of active SRE (see below).
   95                                 Present if (ck_pres | rt_pres == 1).
   96                                 Valid if (rt_pres == 1).
   97         u_int_32 key            inserted by encapsulator e.g. for
   98                                 authentication
   99                                 Present if (key_pres ==1 ).
  100         u_int_32 seq_num        Sequence number to allow for packet order
  101                                 Present if (seq_pres ==1 ).
  102         struct gre_sre[] routing Routing fileds (see below)
  103                                 Present if (rt_pres == 1)
  104  */
  105 } __packed;
  106 
  107 struct greip {
  108         struct ip gi_i;
  109         struct gre_h  gi_g;
  110 } __packed;
  111 
  112 #define gi_pr           gi_i.ip_p
  113 #define gi_len          gi_i.ip_len
  114 #define gi_src          gi_i.ip_src
  115 #define gi_dst          gi_i.ip_dst
  116 #define gi_ptype        gi_g.ptype
  117 #define gi_flags        gi_g.flags
  118 #define gi_options      gi_g.options
  119 
  120 #define GRE_CP          0x8000  /* Checksum Present */
  121 #define GRE_RP          0x4000  /* Routing Present */
  122 #define GRE_KP          0x2000  /* Key Present */
  123 #define GRE_SP          0x1000  /* Sequence Present */
  124 #define GRE_SS          0x0800  /* Strict Source Route */
  125 
  126 /*
  127  * CISCO uses special type for GRE tunnel created as part of WCCP
  128  * connection, while in fact those packets are just IPv4 encapsulated
  129  * into GRE.
  130  */
  131 #define WCCP_PROTOCOL_TYPE      0x883E
  132 
  133 /*
  134  * gre_sre defines a Source route Entry. These are needed if packets
  135  * should be routed over more than one tunnel hop by hop
  136  */
  137 struct gre_sre {
  138         u_int16_t sre_family;   /* address family */
  139         u_char  sre_offset;     /* offset to first octet of active entry */
  140         u_char  sre_length;     /* number of octets in the SRE.
  141                                    sre_lengthl==0 -> last entry. */
  142         u_char  *sre_rtinfo;    /* the routing information */
  143 };
  144 
  145 struct greioctl {
  146         int unit;
  147         struct in_addr addr;
  148 };
  149 
  150 /* for mobile encaps */
  151 
  152 struct mobile_h {
  153         u_int16_t proto;                /* protocol and S-bit */
  154         u_int16_t hcrc;                 /* header checksum */
  155         u_int32_t odst;                 /* original destination address */
  156         u_int32_t osrc;                 /* original source addr, if S-bit set */
  157 } __packed;
  158 
  159 struct mobip_h {
  160         struct ip       mi;
  161         struct mobile_h mh;
  162 } __packed;
  163 
  164 
  165 #define MOB_H_SIZ_S             (sizeof(struct mobile_h) - sizeof(u_int32_t))
  166 #define MOB_H_SIZ_L             (sizeof(struct mobile_h))
  167 #define MOB_H_SBIT      0x0080
  168 
  169 #define GRE_TTL 30
  170 
  171 #endif /* _KERNEL */
  172 
  173 /*
  174  * ioctls needed to manipulate the interface
  175  */
  176 
  177 #define GRESADDRS       _IOW('i', 101, struct ifreq)
  178 #define GRESADDRD       _IOW('i', 102, struct ifreq)
  179 #define GREGADDRS       _IOWR('i', 103, struct ifreq)
  180 #define GREGADDRD       _IOWR('i', 104, struct ifreq)
  181 #define GRESPROTO       _IOW('i' , 105, struct ifreq)
  182 #define GREGPROTO       _IOWR('i', 106, struct ifreq)
  183 #define GREGKEY         _IOWR('i', 107, struct ifreq)
  184 #define GRESKEY         _IOW('i', 108, struct ifreq)
  185 
  186 #ifdef _KERNEL
  187 LIST_HEAD(gre_softc_head, gre_softc);
  188 extern struct mtx gre_mtx;
  189 extern struct gre_softc_head gre_softc_list;
  190 
  191 u_int16_t       gre_in_cksum(u_int16_t *, u_int);
  192 #endif /* _KERNEL */
  193 
  194 #endif

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