summaryrefslogtreecommitdiffstats
path: root/sys/net/if_gre.h
blob: 806b0cb829641bafe4e9f2632973bd925097ff6b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
 * All rights reserved
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Heiko W.Rupp <hwr@pilhuhn.de>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * $NetBSD: if_gre.h,v 1.13 2003/11/10 08:51:52 wiz Exp $
 * $FreeBSD$
 */

#ifndef _NET_IF_GRE_H_
#define _NET_IF_GRE_H_

#ifdef _KERNEL
/* GRE header according to RFC 2784 and RFC 2890 */
struct grehdr {
	uint16_t	gre_flags;	/* GRE flags */
#define	GRE_FLAGS_CP	0x8000		/* checksum present */
#define	GRE_FLAGS_KP	0x2000		/* key present */
#define	GRE_FLAGS_SP	0x1000		/* sequence present */
#define	GRE_FLAGS_MASK	(GRE_FLAGS_CP|GRE_FLAGS_KP|GRE_FLAGS_SP)
	uint16_t	gre_proto;	/* protocol type */
	uint32_t	gre_opts[0];	/* optional fields */
} __packed;

#ifdef INET
struct greip {
	struct ip	gi_ip;
	struct grehdr	gi_gre;
} __packed;
#endif

#ifdef INET6
struct greip6 {
	struct ip6_hdr	gi6_ip6;
	struct grehdr	gi6_gre;
} __packed;
#endif

struct gre_softc {
	struct ifnet		*gre_ifp;
	LIST_ENTRY(gre_softc)	gre_list;
	struct rmlock		gre_lock;
	int			gre_family;	/* AF of delivery header */
	uint32_t		gre_iseq;
	uint32_t		gre_oseq;
	uint32_t		gre_key;
	uint32_t		gre_options;
	uint32_t		gre_mtu;
	u_int			gre_fibnum;
	u_int			gre_hlen;	/* header size */
	union {
		void		*hdr;
#ifdef INET
		struct greip	*gihdr;
#endif
#ifdef INET6
		struct greip6	*gi6hdr;
#endif
	} gre_uhdr;
	const struct encaptab	*gre_ecookie;
};
#define	GRE2IFP(sc)		((sc)->gre_ifp)
#define	GRE_LOCK_INIT(sc)	rm_init(&(sc)->gre_lock, "gre softc")
#define	GRE_LOCK_DESTROY(sc)	rm_destroy(&(sc)->gre_lock)
#define	GRE_RLOCK_TRACKER	struct rm_priotracker gre_tracker
#define	GRE_RLOCK(sc)		rm_rlock(&(sc)->gre_lock, &gre_tracker)
#define	GRE_RUNLOCK(sc)		rm_runlock(&(sc)->gre_lock, &gre_tracker)
#define	GRE_RLOCK_ASSERT(sc)	rm_assert(&(sc)->gre_lock, RA_RLOCKED)
#define	GRE_WLOCK(sc)		rm_wlock(&(sc)->gre_lock)
#define	GRE_WUNLOCK(sc)		rm_wunlock(&(sc)->gre_lock)
#define	GRE_WLOCK_ASSERT(sc)	rm_assert(&(sc)->gre_lock, RA_WLOCKED)

#define	gre_hdr			gre_uhdr.hdr
#define	gre_gihdr		gre_uhdr.gihdr
#define	gre_gi6hdr		gre_uhdr.gi6hdr
#define	gre_oip			gre_gihdr->gi_ip
#define	gre_oip6		gre_gi6hdr->gi6_ip6

int	gre_input(struct mbuf **, int *, int);
#ifdef INET
int	in_gre_attach(struct gre_softc *);
int	in_gre_output(struct mbuf *, int, int);
#endif
#ifdef INET6
int	in6_gre_attach(struct gre_softc *);
int	in6_gre_output(struct mbuf *, int, int);
#endif
/*
 * CISCO uses special type for GRE tunnel created as part of WCCP
 * connection, while in fact those packets are just IPv4 encapsulated
 * into GRE.
 */
#define ETHERTYPE_WCCP		0x883E
#endif /* _KERNEL */

#define GRESADDRS	_IOW('i', 101, struct ifreq)
#define GRESADDRD	_IOW('i', 102, struct ifreq)
#define GREGADDRS	_IOWR('i', 103, struct ifreq)
#define GREGADDRD	_IOWR('i', 104, struct ifreq)
#define GRESPROTO	_IOW('i' , 105, struct ifreq)
#define GREGPROTO	_IOWR('i', 106, struct ifreq)

#define	GREGKEY		_IOWR('i', 107, struct ifreq)
#define	GRESKEY		_IOW('i', 108, struct ifreq)
#define	GREGOPTS	_IOWR('i', 109, struct ifreq)
#define	GRESOPTS	_IOW('i', 110, struct ifreq)

#define	GRE_ENABLE_CSUM		0x0001
#define	GRE_ENABLE_SEQ		0x0002
#define	GRE_OPTMASK		(GRE_ENABLE_CSUM|GRE_ENABLE_SEQ)

#endif /* _NET_IF_GRE_H_ */
OpenPOWER on IntegriCloud