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 /*      $NetBSD: if_gre.h,v 1.13 2003/11/10 08:51:52 wiz Exp $ */
    2 /*       $FreeBSD$ */
    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         struct in_addr g_src;   /* source address of gre packets */
   63         struct in_addr g_dst;   /* destination address of gre packets */
   64         struct route route;     /* routing entry that determines, where a
   65                                    encapsulated packet should go */
   66         u_char g_proto;         /* protocol of encapsulator */
   67 
   68         const struct encaptab *encap;   /* encapsulation cookie */
   69 
   70         int called;             /* infinite recursion preventer */
   71 
   72         wccp_ver_t wccp_ver;    /* version of the WCCP */
   73 };
   74 #define GRE2IFP(sc)     ((sc)->sc_ifp)
   75 
   76 
   77 struct gre_h {
   78         u_int16_t flags;        /* GRE flags */
   79         u_int16_t ptype;        /* protocol type of payload typically
   80                                    Ether protocol type*/
   81 /*
   82  *  from here on: fields are optional, presence indicated by flags
   83  *
   84         u_int_16 checksum       checksum (one-complements of GRE header
   85                                 and payload
   86                                 Present if (ck_pres | rt_pres == 1).
   87                                 Valid if (ck_pres == 1).
   88         u_int_16 offset         offset from start of routing filed to
   89                                 first octet of active SRE (see below).
   90                                 Present if (ck_pres | rt_pres == 1).
   91                                 Valid if (rt_pres == 1).
   92         u_int_32 key            inserted by encapsulator e.g. for
   93                                 authentication
   94                                 Present if (key_pres ==1 ).
   95         u_int_32 seq_num        Sequence number to allow for packet order
   96                                 Present if (seq_pres ==1 ).
   97         struct gre_sre[] routing Routing fileds (see below)
   98                                 Present if (rt_pres == 1)
   99  */
  100 } __packed;
  101 
  102 struct greip {
  103         struct ip gi_i;
  104         struct gre_h  gi_g;
  105 } __packed;
  106 
  107 #define gi_pr           gi_i.ip_p
  108 #define gi_len          gi_i.ip_len
  109 #define gi_src          gi_i.ip_src
  110 #define gi_dst          gi_i.ip_dst
  111 #define gi_ptype        gi_g.ptype
  112 #define gi_flags        gi_g.flags
  113 
  114 #define GRE_CP          0x8000  /* Checksum Present */
  115 #define GRE_RP          0x4000  /* Routing Present */
  116 #define GRE_KP          0x2000  /* Key Present */
  117 #define GRE_SP          0x1000  /* Sequence Present */
  118 #define GRE_SS          0x0800  /* Strict Source Route */
  119 
  120 /*
  121  * CISCO uses special type for GRE tunnel created as part of WCCP
  122  * connection, while in fact those packets are just IPv4 encapsulated
  123  * into GRE.
  124  */
  125 #define WCCP_PROTOCOL_TYPE      0x883E
  126 
  127 /*
  128  * gre_sre defines a Source route Entry. These are needed if packets
  129  * should be routed over more than one tunnel hop by hop
  130  */
  131 struct gre_sre {
  132         u_int16_t sre_family;   /* address family */
  133         u_char  sre_offset;     /* offset to first octet of active entry */
  134         u_char  sre_length;     /* number of octets in the SRE.
  135                                    sre_lengthl==0 -> last entry. */
  136         u_char  *sre_rtinfo;    /* the routing information */
  137 };
  138 
  139 struct greioctl {
  140         int unit;
  141         struct in_addr addr;
  142 };
  143 
  144 /* for mobile encaps */
  145 
  146 struct mobile_h {
  147         u_int16_t proto;                /* protocol and S-bit */
  148         u_int16_t hcrc;                 /* header checksum */
  149         u_int32_t odst;                 /* original destination address */
  150         u_int32_t osrc;                 /* original source addr, if S-bit set */
  151 } __packed;
  152 
  153 struct mobip_h {
  154         struct ip       mi;
  155         struct mobile_h mh;
  156 } __packed;
  157 
  158 
  159 #define MOB_H_SIZ_S             (sizeof(struct mobile_h) - sizeof(u_int32_t))
  160 #define MOB_H_SIZ_L             (sizeof(struct mobile_h))
  161 #define MOB_H_SBIT      0x0080
  162 
  163 #define GRE_TTL 30
  164 
  165 #endif /* _KERNEL */
  166 
  167 /*
  168  * ioctls needed to manipulate the interface
  169  */
  170 
  171 #define GRESADDRS       _IOW('i', 101, struct ifreq)
  172 #define GRESADDRD       _IOW('i', 102, struct ifreq)
  173 #define GREGADDRS       _IOWR('i', 103, struct ifreq)
  174 #define GREGADDRD       _IOWR('i', 104, struct ifreq)
  175 #define GRESPROTO       _IOW('i' , 105, struct ifreq)
  176 #define GREGPROTO       _IOWR('i', 106, struct ifreq)
  177 
  178 #ifdef _KERNEL
  179 LIST_HEAD(gre_softc_head, gre_softc);
  180 extern struct mtx gre_mtx;
  181 extern struct gre_softc_head gre_softc_list;
  182 
  183 u_int16_t       gre_in_cksum(u_int16_t *, u_int);
  184 #endif /* _KERNEL */
  185 
  186 #endif

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