FreeBSD/Linux Kernel Cross Reference
sys/net/if_gre.h
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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