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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 1998 The NetBSD Foundation, Inc.
      * Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
      * 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.
     *
     * 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.
     *
     * $NetBSD: if_gre.h,v 1.13 2003/11/10 08:51:52 wiz Exp $
     * $FreeBSD: releng/12.0/sys/net/if_gre.h 335924 2018-07-04 02:47:16Z mmacy $
     */
    
    #ifndef _NET_IF_GRE_H_
    #define _NET_IF_GRE_H_
    
    #ifdef _KERNEL
    /* GRE header according to RFC 2784 and RFC 2890 */
    struct grehdr {
            uint16_t        gre_flags;      /* GRE flags */
    #define GRE_FLAGS_CP    0x8000          /* checksum present */
    #define GRE_FLAGS_KP    0x2000          /* key present */
    #define GRE_FLAGS_SP    0x1000          /* sequence present */
    #define GRE_FLAGS_MASK  (GRE_FLAGS_CP|GRE_FLAGS_KP|GRE_FLAGS_SP)
            uint16_t        gre_proto;      /* protocol type */
            uint32_t        gre_opts[0];    /* optional fields */
    } __packed;
    
    #ifdef INET
    struct greip {
            struct ip       gi_ip;
            struct grehdr   gi_gre;
    } __packed;
    #endif
    
    #ifdef INET6
    struct greip6 {
            struct ip6_hdr  gi6_ip6;
            struct grehdr   gi6_gre;
    } __packed;
    #endif
    
    struct gre_softc {
            struct ifnet            *gre_ifp;
            int                     gre_family;     /* AF of delivery header */
            uint32_t                gre_iseq;
            uint32_t                gre_oseq;
            uint32_t                gre_key;
            uint32_t                gre_options;
            u_int                   gre_fibnum;
            u_int                   gre_hlen;       /* header size */
            union {
                    void            *hdr;
    #ifdef INET
                    struct greip    *gihdr;
    #endif
    #ifdef INET6
                    struct greip6   *gi6hdr;
    #endif
            } gre_uhdr;
    
            CK_LIST_ENTRY(gre_softc) chain;
    };
    CK_LIST_HEAD(gre_list, gre_softc);
    MALLOC_DECLARE(M_GRE);
    
    #ifndef GRE_HASH_SIZE
    #define GRE_HASH_SIZE   (1 << 4)
    #endif
    
    #define GRE2IFP(sc)             ((sc)->gre_ifp)
    #define GRE_RLOCK()             struct epoch_tracker gre_et; epoch_enter_preempt(net_epoch_preempt, &gre_et)
    #define GRE_RUNLOCK()           epoch_exit_preempt(net_epoch_preempt, &gre_et)
    #define GRE_WAIT()              epoch_wait_preempt(net_epoch_preempt)
    
    #define gre_hdr                 gre_uhdr.hdr
    #define gre_gihdr               gre_uhdr.gihdr
   #define gre_gi6hdr              gre_uhdr.gi6hdr
   #define gre_oip                 gre_gihdr->gi_ip
   #define gre_oip6                gre_gi6hdr->gi6_ip6
   
   struct gre_list *gre_hashinit(void);
   void gre_hashdestroy(struct gre_list *);
   
   int     gre_input(struct mbuf *, int, int, void *);
   void    gre_updatehdr(struct gre_softc *, struct grehdr *);
   
   void    in_gre_init(void);
   void    in_gre_uninit(void);
   void    in_gre_setopts(struct gre_softc *, u_long, uint32_t);
   int     in_gre_ioctl(struct gre_softc *, u_long, caddr_t);
   int     in_gre_output(struct mbuf *, int, int);
   
   void    in6_gre_init(void);
   void    in6_gre_uninit(void);
   void    in6_gre_setopts(struct gre_softc *, u_long, uint32_t);
   int     in6_gre_ioctl(struct gre_softc *, u_long, caddr_t);
   int     in6_gre_output(struct mbuf *, int, int);
   /*
    * 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 ETHERTYPE_WCCP          0x883E
   #endif /* _KERNEL */
   
   #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)
   
   #define GREGKEY         _IOWR('i', 107, struct ifreq)
   #define GRESKEY         _IOW('i', 108, struct ifreq)
   #define GREGOPTS        _IOWR('i', 109, struct ifreq)
   #define GRESOPTS        _IOW('i', 110, struct ifreq)
   
   #define GRE_ENABLE_CSUM         0x0001
   #define GRE_ENABLE_SEQ          0x0002
   #define GRE_OPTMASK             (GRE_ENABLE_CSUM|GRE_ENABLE_SEQ)
   
   #endif /* _NET_IF_GRE_H_ */

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