if_gre.h (5800B) - Raw
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_ */