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 */ 40struct 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 51struct greip { 52 struct ip gi_ip; 53 struct grehdr gi_gre; 54} __packed; 55 56struct 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 64struct greip6 { 65 struct ip6_hdr gi6_ip6; 66 struct grehdr gi6_gre; 67} __packed; 68 69struct greudp6 { 70 struct ip6_hdr gi6_ip6; 71 struct udphdr gi6_udp; 72 struct grehdr gi6_gre; 73} __packed; 74#endif /* INET6 */ 75 76CK_LIST_HEAD(gre_list, gre_softc); 77CK_LIST_HEAD(gre_sockets, gre_socket); 78struct 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 85struct 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}; 112MALLOC_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 135struct gre_list *gre_hashinit(void); 136void gre_hashdestroy(struct gre_list *); 137 138int gre_input(struct mbuf *, int, int, void *); 139void gre_update_hdr(struct gre_softc *, struct grehdr *); 140void gre_update_udphdr(struct gre_softc *, struct udphdr *, uint16_t); 141void gre_sofree(epoch_context_t); 142 143void in_gre_init(void); 144void in_gre_uninit(void); 145int in_gre_setopts(struct gre_softc *, u_long, uint32_t); 146int in_gre_ioctl(struct gre_softc *, u_long, caddr_t); 147int in_gre_output(struct mbuf *, int, int); 148 149void in6_gre_init(void); 150void in6_gre_uninit(void); 151int in6_gre_setopts(struct gre_softc *, u_long, uint32_t); 152int in6_gre_ioctl(struct gre_softc *, u_long, caddr_t); 153int 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_ */ 185