FreeBSD/Linux Kernel Cross Reference
sys/net/if_gre.h

     /*      $NetBSD: if_gre.h,v 1.10 2002/02/24 17:22:20 martin Exp $ */
     /*       $FreeBSD: releng/5.0/sys/net/if_gre.h 107670 2002-12-07 14:22:05Z sobomax $ */
     
     /*
      * Copyright (c) 1998 The NetBSD Foundation, Inc.
      * All rights reserved
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Heiko W.Rupp <hwr@pilhuhn.de>
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *        This product includes software developed by the NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *    
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef _NET_IF_GRE_H
    #define _NET_IF_GRE_H
    
    #include <sys/ioccom.h>
    #ifdef _KERNEL
    #include <sys/queue.h>
    
    struct gre_softc {
            struct ifnet sc_if;
            LIST_ENTRY(gre_softc) sc_list;
            int gre_unit;
            int gre_flags;
            struct in_addr g_src;   /* source address of gre packets */
            struct in_addr g_dst;   /* destination address of gre packets */
            struct route route;     /* routing entry that determines, where a
                                       encapsulated packet should go */
            u_char g_proto;         /* protocol of encapsulator */
    
            const struct encaptab *encap;   /* encapsulation cookie */
    
            int called;             /* infinite recursion preventer */
    };      
    
    
    struct gre_h {
            u_int16_t flags;        /* GRE flags */
            u_int16_t ptype;        /* protocol type of payload typically 
                                       Ether protocol type*/
    /* 
     *  from here on: fields are optional, presence indicated by flags 
     *
            u_int_16 checksum       checksum (one-complements of GRE header
                                    and payload
                                    Present if (ck_pres | rt_pres == 1).
                                    Valid if (ck_pres == 1).
            u_int_16 offset         offset from start of routing filed to
                                    first octet of active SRE (see below).
                                    Present if (ck_pres | rt_pres == 1).
                                    Valid if (rt_pres == 1).
            u_int_32 key            inserted by encapsulator e.g. for
                                    authentication
                                    Present if (key_pres ==1 ).
            u_int_32 seq_num        Sequence number to allow for packet order
                                    Present if (seq_pres ==1 ).
            struct gre_sre[] routing Routing fileds (see below)
                                    Present if (rt_pres == 1)
     */
    } __packed;
    
    struct greip {
            struct ip gi_i;
            struct gre_h  gi_g;
    } __packed;
    
    #define gi_pr           gi_i.ip_p
    #define gi_len          gi_i.ip_len
    #define gi_src          gi_i.ip_src
    #define gi_dst          gi_i.ip_dst
    #define gi_ptype        gi_g.ptype
    #define gi_flags        gi_g.flags
   
   #define GRE_CP          0x8000  /* Checksum Present */
   #define GRE_RP          0x4000  /* Routing Present */
   #define GRE_KP          0x2000  /* Key Present */
   #define GRE_SP          0x1000  /* Sequence Present */
   #define GRE_SS          0x0800  /* Strict Source Route */
   
   /*
    * CISCO uses special type for GRE tunnel created as part of WCCP
    * connection, while in fact those packets are just IPv4 encapsulated
    * into GRE.
    */
   #define WCCP_PROTOCOL_TYPE      0x883E
   
   /*
    * gre_sre defines a Source route Entry. These are needed if packets
    * should be routed over more than one tunnel hop by hop
    */
   struct gre_sre {
           u_int16_t sre_family;   /* adress family */
           u_char  sre_offset;     /* offset to first octet of active entry */
           u_char  sre_length;     /* number of octets in the SRE. 
                                      sre_lengthl==0 -> last entry. */
           u_char  *sre_rtinfo;    /* the routing information */
   };
   
   struct greioctl {
           int unit;
           struct in_addr addr;
   };
   
   /* for mobile encaps */
   
   struct mobile_h {
           u_int16_t proto;                /* protocol and S-bit */
           u_int16_t hcrc;                 /* header checksum */
           u_int32_t odst;                 /* original destination address */
           u_int32_t osrc;                 /* original source addr, if S-bit set */
   } __packed;
   
   struct mobip_h {
           struct ip       mi;
           struct mobile_h mh;
   } __packed;
   
   
   #define MOB_H_SIZ_S             (sizeof(struct mobile_h) - sizeof(u_int32_t))
   #define MOB_H_SIZ_L             (sizeof(struct mobile_h))
   #define MOB_H_SBIT      0x0080
   
   #define GRE_TTL 30
   
   #endif /* _KERNEL */
   
   /* 
    * ioctls needed to manipulate the interface 
    */
   
   #define GRESADDRS       _IOW('i', 101, struct ifreq)
   #define GRESADDRD       _IOW('i', 102, struct ifreq)   
   #define GREGADDRS       _IOWR('i', 103, struct ifreq)
   #define GREGADDRD       _IOWR('i', 104, struct ifreq)
   #define GRESPROTO       _IOW('i' , 105, struct ifreq)
   #define GREGPROTO       _IOWR('i', 106, struct ifreq)
   
   #ifdef _KERNEL
   LIST_HEAD(gre_softc_head, gre_softc);
   extern struct gre_softc_head gre_softc_list;
   
   u_short gre_in_cksum(u_short *p, u_int len);
   #endif /* _KERNEL */
   
   #endif

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