sys/net/if_gre.h

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