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 #endif 57 58 #ifdef INET6 59 struct greip6 { 60 struct ip6_hdr gi6_ip6; 61 struct grehdr gi6_gre; 62 } __packed; 63 #endif 64 65 struct gre_softc { 66 struct ifnet *gre_ifp; 67 int gre_family; /* AF of delivery header */ 68 uint32_t gre_iseq; 69 uint32_t gre_oseq; 70 uint32_t gre_key; 71 uint32_t gre_options; 72 u_int gre_fibnum; 73 u_int gre_hlen; /* header size */ 74 union { 75 void *hdr; 76 #ifdef INET 77 struct greip *gihdr; 78 #endif 79 #ifdef INET6 80 struct greip6 *gi6hdr; 81 #endif 82 } gre_uhdr; 83 84 CK_LIST_ENTRY(gre_softc) chain; 85 }; 86 CK_LIST_HEAD(gre_list, gre_softc); 87 MALLOC_DECLARE(M_GRE); 88 89 #ifndef GRE_HASH_SIZE 90 #define GRE_HASH_SIZE (1 << 4) 91 #endif 92 93 #define GRE2IFP(sc) ((sc)->gre_ifp) 94 #define GRE_RLOCK() epoch_enter_preempt(net_epoch_preempt) 95 #define GRE_RUNLOCK() epoch_exit_preempt(net_epoch_preempt) 96 #define GRE_WAIT() epoch_wait_preempt(net_epoch_preempt) 97 98 #define gre_hdr gre_uhdr.hdr 99 #define gre_gihdr gre_uhdr.gihdr 100 #define gre_gi6hdr gre_uhdr.gi6hdr 101 #define gre_oip gre_gihdr->gi_ip 102 #define gre_oip6 gre_gi6hdr->gi6_ip6 103 104 struct gre_list *gre_hashinit(void); 105 void gre_hashdestroy(struct gre_list *); 106 107 int gre_input(struct mbuf *, int, int, void *); 108 void gre_updatehdr(struct gre_softc *, struct grehdr *); 109 110 void in_gre_init(void); 111 void in_gre_uninit(void); 112 void in_gre_setopts(struct gre_softc *, u_long, uint32_t); 113 int in_gre_ioctl(struct gre_softc *, u_long, caddr_t); 114 int in_gre_output(struct mbuf *, int, int); 115 116 void in6_gre_init(void); 117 void in6_gre_uninit(void); 118 void in6_gre_setopts(struct gre_softc *, u_long, uint32_t); 119 int in6_gre_ioctl(struct gre_softc *, u_long, caddr_t); 120 int in6_gre_output(struct mbuf *, int, int); 121 /* 122 * CISCO uses special type for GRE tunnel created as part of WCCP 123 * connection, while in fact those packets are just IPv4 encapsulated 124 * into GRE. 125 */ 126 #define ETHERTYPE_WCCP 0x883E 127 #endif /* _KERNEL */ 128 129 #define GRESADDRS _IOW('i', 101, struct ifreq) 130 #define GRESADDRD _IOW('i', 102, struct ifreq) 131 #define GREGADDRS _IOWR('i', 103, struct ifreq) 132 #define GREGADDRD _IOWR('i', 104, struct ifreq) 133 #define GRESPROTO _IOW('i' , 105, struct ifreq) 134 #define GREGPROTO _IOWR('i', 106, struct ifreq) 135 136 #define GREGKEY _IOWR('i', 107, struct ifreq) 137 #define GRESKEY _IOW('i', 108, struct ifreq) 138 #define GREGOPTS _IOWR('i', 109, struct ifreq) 139 #define GRESOPTS _IOW('i', 110, struct ifreq) 140 141 #define GRE_ENABLE_CSUM 0x0001 142 #define GRE_ENABLE_SEQ 0x0002 143 #define GRE_OPTMASK (GRE_ENABLE_CSUM|GRE_ENABLE_SEQ) 144 145 #endif /* _NET_IF_GRE_H_ */ 146