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 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    5  * Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
    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  * $NetBSD: if_gre.h,v 1.13 2003/11/10 08:51:52 wiz Exp $
   33  * $FreeBSD$
   34  */
   35 
   36 #ifndef _NET_IF_GRE_H_
   37 #define _NET_IF_GRE_H_
   38 
   39 #ifdef _KERNEL
   40 /* GRE header according to RFC 2784 and RFC 2890 */
   41 struct grehdr {
   42         uint16_t        gre_flags;      /* GRE flags */
   43 #define GRE_FLAGS_CP    0x8000          /* checksum present */
   44 #define GRE_FLAGS_KP    0x2000          /* key present */
   45 #define GRE_FLAGS_SP    0x1000          /* sequence present */
   46 #define GRE_FLAGS_MASK  (GRE_FLAGS_CP|GRE_FLAGS_KP|GRE_FLAGS_SP)
   47         uint16_t        gre_proto;      /* protocol type */
   48         uint32_t        gre_opts[0];    /* optional fields */
   49 } __packed;
   50 
   51 #ifdef INET
   52 struct greip {
   53         struct ip       gi_ip;
   54         struct grehdr   gi_gre;
   55 } __packed;
   56 
   57 struct greudp {
   58         struct ip       gi_ip;
   59         struct udphdr   gi_udp;
   60         struct grehdr   gi_gre;
   61 } __packed;
   62 #endif /* INET */
   63 
   64 #ifdef INET6
   65 struct greip6 {
   66         struct ip6_hdr  gi6_ip6;
   67         struct grehdr   gi6_gre;
   68 } __packed;
   69 
   70 struct greudp6 {
   71         struct ip6_hdr  gi6_ip6;
   72         struct udphdr   gi6_udp;
   73         struct grehdr   gi6_gre;
   74 } __packed;
   75 #endif /* INET6 */
   76 
   77 CK_LIST_HEAD(gre_list, gre_softc);
   78 CK_LIST_HEAD(gre_sockets, gre_socket);
   79 struct gre_socket {
   80         struct socket           *so;
   81         struct gre_list         list;
   82         CK_LIST_ENTRY(gre_socket) chain;
   83         struct epoch_context    epoch_ctx;
   84 };
   85 
   86 struct gre_softc {
   87         struct ifnet            *gre_ifp;
   88         int                     gre_family;     /* AF of delivery header */
   89         uint32_t                gre_iseq;
   90         uint32_t                gre_oseq;
   91         uint32_t                gre_key;
   92         uint32_t                gre_options;
   93         uint32_t                gre_csumflags;
   94         uint32_t                gre_port;
   95         u_int                   gre_fibnum;
   96         u_int                   gre_hlen;       /* header size */
   97         union {
   98                 void            *hdr;
   99 #ifdef INET
  100                 struct greip    *iphdr;
  101                 struct greudp   *udphdr;
  102 #endif
  103 #ifdef INET6
  104                 struct greip6   *ip6hdr;
  105                 struct greudp6  *udp6hdr;
  106 #endif
  107         } gre_uhdr;
  108         struct gre_socket       *gre_so;
  109 
  110         CK_LIST_ENTRY(gre_softc) chain;
  111         CK_LIST_ENTRY(gre_softc) srchash;
  112 };
  113 MALLOC_DECLARE(M_GRE);
  114 
  115 #ifndef GRE_HASH_SIZE
  116 #define GRE_HASH_SIZE   (1 << 4)
  117 #endif
  118 
  119 #define GRE2IFP(sc)             ((sc)->gre_ifp)
  120 #define GRE_RLOCK_TRACKER       struct epoch_tracker gre_et
  121 #define GRE_RLOCK()             epoch_enter_preempt(net_epoch_preempt, &gre_et)
  122 #define GRE_RUNLOCK()           epoch_exit_preempt(net_epoch_preempt, &gre_et)
  123 #define GRE_WAIT()              epoch_wait_preempt(net_epoch_preempt)
  124 
  125 #define gre_hdr                 gre_uhdr.hdr
  126 #define gre_iphdr               gre_uhdr.iphdr
  127 #define gre_ip6hdr              gre_uhdr.ip6hdr
  128 #define gre_udphdr              gre_uhdr.udphdr
  129 #define gre_udp6hdr             gre_uhdr.udp6hdr
  130 
  131 #define gre_oip                 gre_iphdr->gi_ip
  132 #define gre_udp                 gre_udphdr->gi_udp
  133 #define gre_oip6                gre_ip6hdr->gi6_ip6
  134 #define gre_udp6                gre_udp6hdr->gi6_udp
  135 
  136 struct gre_list *gre_hashinit(void);
  137 void gre_hashdestroy(struct gre_list *);
  138 
  139 int     gre_input(struct mbuf *, int, int, void *);
  140 void    gre_update_hdr(struct gre_softc *, struct grehdr *);
  141 void    gre_update_udphdr(struct gre_softc *, struct udphdr *, uint16_t);
  142 void    gre_sofree(epoch_context_t);
  143 
  144 void    in_gre_init(void);
  145 void    in_gre_uninit(void);
  146 int     in_gre_setopts(struct gre_softc *, u_long, uint32_t);
  147 int     in_gre_ioctl(struct gre_softc *, u_long, caddr_t);
  148 int     in_gre_output(struct mbuf *, int, int);
  149 
  150 void    in6_gre_init(void);
  151 void    in6_gre_uninit(void);
  152 int     in6_gre_setopts(struct gre_softc *, u_long, uint32_t);
  153 int     in6_gre_ioctl(struct gre_softc *, u_long, caddr_t);
  154 int     in6_gre_output(struct mbuf *, int, int, uint32_t);
  155 /*
  156  * CISCO uses special type for GRE tunnel created as part of WCCP
  157  * connection, while in fact those packets are just IPv4 encapsulated
  158  * into GRE.
  159  */
  160 #define ETHERTYPE_WCCP          0x883E
  161 #endif /* _KERNEL */
  162 
  163 #define GRESADDRS       _IOW('i', 101, struct ifreq)
  164 #define GRESADDRD       _IOW('i', 102, struct ifreq)
  165 #define GREGADDRS       _IOWR('i', 103, struct ifreq)
  166 #define GREGADDRD       _IOWR('i', 104, struct ifreq)
  167 #define GRESPROTO       _IOW('i' , 105, struct ifreq)
  168 #define GREGPROTO       _IOWR('i', 106, struct ifreq)
  169 
  170 #define GREGKEY         _IOWR('i', 107, struct ifreq)
  171 #define GRESKEY         _IOW('i', 108, struct ifreq)
  172 #define GREGOPTS        _IOWR('i', 109, struct ifreq)
  173 #define GRESOPTS        _IOW('i', 110, struct ifreq)
  174 #define GREGPORT        _IOWR('i', 111, struct ifreq)
  175 #define GRESPORT        _IOW('i', 112, struct ifreq)
  176 
  177 /* GRE-in-UDP encapsulation destination port as defined in RFC8086 */
  178 #define GRE_UDPPORT             4754
  179 
  180 #define GRE_ENABLE_CSUM         0x0001
  181 #define GRE_ENABLE_SEQ          0x0002
  182 #define GRE_UDPENCAP            0x0004
  183 #define GRE_OPTMASK             (GRE_ENABLE_CSUM|GRE_ENABLE_SEQ|GRE_UDPENCAP)
  184 
  185 #endif /* _NET_IF_GRE_H_ */

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