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: releng/9.1/sys/net/if_gre.h 223223 2011-06-18 09:34:03Z bz $ */
    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  *
   20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #ifndef _NET_IF_GRE_H
   34 #define _NET_IF_GRE_H
   35 
   36 #include <sys/ioccom.h>
   37 #ifdef _KERNEL
   38 #include <sys/queue.h>
   39 
   40 /*
   41  * Version of the WCCP, need to be configured manually since
   42  * header for version 2 is the same but IP payload is prepended
   43  * with additional 4-bytes field.
   44  */
   45 typedef enum {
   46         WCCP_V1 = 0,
   47         WCCP_V2
   48 } wccp_ver_t;
   49 
   50 struct gre_softc {
   51         struct ifnet *sc_ifp;
   52         LIST_ENTRY(gre_softc) sc_list;
   53         int gre_unit;
   54         int gre_flags;
   55         u_int   gre_fibnum;     /* use this fib for envelopes */
   56         struct in_addr g_src;   /* source address of gre packets */
   57         struct in_addr g_dst;   /* destination address of gre packets */
   58         struct route route;     /* routing entry that determines, where a
   59                                    encapsulated packet should go */
   60         u_char g_proto;         /* protocol of encapsulator */
   61 
   62         const struct encaptab *encap;   /* encapsulation cookie */
   63 
   64         uint32_t key;           /* key included in outgoing GRE packets */
   65                                 /* zero means none */
   66 
   67         wccp_ver_t wccp_ver;    /* version of the WCCP */
   68 };
   69 #define GRE2IFP(sc)     ((sc)->sc_ifp)
   70 
   71 
   72 struct gre_h {
   73         u_int16_t flags;        /* GRE flags */
   74         u_int16_t ptype;        /* protocol type of payload typically
   75                                    Ether protocol type*/
   76         uint32_t options[0];    /* optional options */
   77 /*
   78  *  from here on: fields are optional, presence indicated by flags
   79  *
   80         u_int_16 checksum       checksum (one-complements of GRE header
   81                                 and payload
   82                                 Present if (ck_pres | rt_pres == 1).
   83                                 Valid if (ck_pres == 1).
   84         u_int_16 offset         offset from start of routing filed to
   85                                 first octet of active SRE (see below).
   86                                 Present if (ck_pres | rt_pres == 1).
   87                                 Valid if (rt_pres == 1).
   88         u_int_32 key            inserted by encapsulator e.g. for
   89                                 authentication
   90                                 Present if (key_pres ==1 ).
   91         u_int_32 seq_num        Sequence number to allow for packet order
   92                                 Present if (seq_pres ==1 ).
   93         struct gre_sre[] routing Routing fileds (see below)
   94                                 Present if (rt_pres == 1)
   95  */
   96 } __packed;
   97 
   98 struct greip {
   99         struct ip gi_i;
  100         struct gre_h  gi_g;
  101 } __packed;
  102 
  103 #define gi_pr           gi_i.ip_p
  104 #define gi_len          gi_i.ip_len
  105 #define gi_src          gi_i.ip_src
  106 #define gi_dst          gi_i.ip_dst
  107 #define gi_ptype        gi_g.ptype
  108 #define gi_flags        gi_g.flags
  109 #define gi_options      gi_g.options
  110 
  111 #define GRE_CP          0x8000  /* Checksum Present */
  112 #define GRE_RP          0x4000  /* Routing Present */
  113 #define GRE_KP          0x2000  /* Key Present */
  114 #define GRE_SP          0x1000  /* Sequence Present */
  115 #define GRE_SS          0x0800  /* Strict Source Route */
  116 
  117 /*
  118  * CISCO uses special type for GRE tunnel created as part of WCCP
  119  * connection, while in fact those packets are just IPv4 encapsulated
  120  * into GRE.
  121  */
  122 #define WCCP_PROTOCOL_TYPE      0x883E
  123 
  124 /*
  125  * gre_sre defines a Source route Entry. These are needed if packets
  126  * should be routed over more than one tunnel hop by hop
  127  */
  128 struct gre_sre {
  129         u_int16_t sre_family;   /* address family */
  130         u_char  sre_offset;     /* offset to first octet of active entry */
  131         u_char  sre_length;     /* number of octets in the SRE.
  132                                    sre_lengthl==0 -> last entry. */
  133         u_char  *sre_rtinfo;    /* the routing information */
  134 };
  135 
  136 struct greioctl {
  137         int unit;
  138         struct in_addr addr;
  139 };
  140 
  141 /* for mobile encaps */
  142 
  143 struct mobile_h {
  144         u_int16_t proto;                /* protocol and S-bit */
  145         u_int16_t hcrc;                 /* header checksum */
  146         u_int32_t odst;                 /* original destination address */
  147         u_int32_t osrc;                 /* original source addr, if S-bit set */
  148 } __packed;
  149 
  150 struct mobip_h {
  151         struct ip       mi;
  152         struct mobile_h mh;
  153 } __packed;
  154 
  155 
  156 #define MOB_H_SIZ_S             (sizeof(struct mobile_h) - sizeof(u_int32_t))
  157 #define MOB_H_SIZ_L             (sizeof(struct mobile_h))
  158 #define MOB_H_SBIT      0x0080
  159 
  160 #define GRE_TTL 30
  161 
  162 #endif /* _KERNEL */
  163 
  164 /*
  165  * ioctls needed to manipulate the interface
  166  */
  167 
  168 #define GRESADDRS       _IOW('i', 101, struct ifreq)
  169 #define GRESADDRD       _IOW('i', 102, struct ifreq)
  170 #define GREGADDRS       _IOWR('i', 103, struct ifreq)
  171 #define GREGADDRD       _IOWR('i', 104, struct ifreq)
  172 #define GRESPROTO       _IOW('i' , 105, struct ifreq)
  173 #define GREGPROTO       _IOWR('i', 106, struct ifreq)
  174 #define GREGKEY         _IOWR('i', 107, struct ifreq)
  175 #define GRESKEY         _IOW('i', 108, struct ifreq)
  176 
  177 #ifdef _KERNEL
  178 LIST_HEAD(gre_softc_head, gre_softc);
  179 extern struct mtx gre_mtx;
  180 extern struct gre_softc_head gre_softc_list;
  181 
  182 u_int16_t       gre_in_cksum(u_int16_t *, u_int);
  183 #endif /* _KERNEL */
  184 
  185 #endif

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