7144dc8bc2
Split it into two modules: if_gre(4) for GRE encapsulation and if_me(4) for minimal encapsulation within IP. gre(4) changes: * convert to if_transmit; * rework locking: protect access to softc with rmlock, protect from concurrent ioctls with sx lock; * correct interface accounting for outgoing datagramms (count only payload size); * implement generic support for using IPv6 as delivery header; * make implementation conform to the RFC 2784 and partially to RFC 2890; * add support for GRE checksums - calculate for outgoing datagramms and check for inconming datagramms; * add support for sending sequence number in GRE header; * remove support of cached routes. This fixes problem, when gre(4) doesn't work at system startup. But this also removes support for having tunnels with the same addresses for inner and outer header. * deprecate support for various GREXXX ioctls, that doesn't used in FreeBSD. Use our standard ioctls for tunnels. me(4): * implementation conform to RFC 2004; * use if_transmit; * use the same locking model as gre(4); PR: 164475 Differential Revision: D1023 No objections from: net@ Relnotes: yes Sponsored by: Yandex LLC
128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
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* All rights reserved
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Heiko W.Rupp <hwr@pilhuhn.de>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: if_gre.h,v 1.13 2003/11/10 08:51:52 wiz Exp $
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* $FreeBSD$
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*/
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#ifndef _NET_IF_GRE_H_
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#define _NET_IF_GRE_H_
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#ifdef _KERNEL
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/* GRE header according to RFC 2784 and RFC 2890 */
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struct grehdr {
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uint16_t gre_flags; /* GRE flags */
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#define GRE_FLAGS_CP 0x8000 /* checksum present */
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#define GRE_FLAGS_KP 0x2000 /* key present */
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#define GRE_FLAGS_SP 0x1000 /* sequence present */
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#define GRE_FLAGS_MASK (GRE_FLAGS_CP|GRE_FLAGS_KP|GRE_FLAGS_SP)
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uint16_t gre_proto; /* protocol type */
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uint32_t gre_opts[0]; /* optional fields */
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} __packed;
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#ifdef INET
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struct greip {
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struct ip gi_ip;
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struct grehdr gi_gre;
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} __packed;
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#endif
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#ifdef INET6
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struct greip6 {
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struct ip6_hdr gi6_ip6;
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struct grehdr gi6_gre;
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} __packed;
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#endif
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struct gre_softc {
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struct ifnet *gre_ifp;
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LIST_ENTRY(gre_softc) gre_list;
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struct rmlock gre_lock;
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int gre_family; /* AF of delivery header */
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uint32_t gre_iseq;
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uint32_t gre_oseq;
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uint32_t gre_key;
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uint32_t gre_options;
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uint32_t gre_mtu;
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u_int gre_fibnum;
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u_int gre_hlen; /* header size */
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union {
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void *hdr;
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#ifdef INET
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struct greip *gihdr;
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#endif
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#ifdef INET6
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struct greip6 *gi6hdr;
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#endif
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} gre_uhdr;
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const struct encaptab *gre_ecookie;
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};
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#define GRE2IFP(sc) ((sc)->gre_ifp)
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#define GRE_LOCK_INIT(sc) rm_init(&(sc)->gre_lock, "gre softc")
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#define GRE_LOCK_DESTROY(sc) rm_destroy(&(sc)->gre_lock)
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#define GRE_RLOCK_TRACKER struct rm_priotracker gre_tracker
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#define GRE_RLOCK(sc) rm_rlock(&(sc)->gre_lock, &gre_tracker)
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#define GRE_RUNLOCK(sc) rm_runlock(&(sc)->gre_lock, &gre_tracker)
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#define GRE_RLOCK_ASSERT(sc) rm_assert(&(sc)->gre_lock, RA_RLOCKED)
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#define GRE_WLOCK(sc) rm_wlock(&(sc)->gre_lock)
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#define GRE_WUNLOCK(sc) rm_wunlock(&(sc)->gre_lock)
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#define GRE_WLOCK_ASSERT(sc) rm_assert(&(sc)->gre_lock, RA_WLOCKED)
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#define gre_hdr gre_uhdr.hdr
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#define gre_gihdr gre_uhdr.gihdr
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#define gre_gi6hdr gre_uhdr.gi6hdr
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#define gre_oip gre_gihdr->gi_ip
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#define gre_oip6 gre_gi6hdr->gi6_ip6
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/*
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* CISCO uses special type for GRE tunnel created as part of WCCP
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* connection, while in fact those packets are just IPv4 encapsulated
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* into GRE.
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*/
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#define ETHERTYPE_WCCP 0x883E
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#endif /* _KERNEL */
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#define GRESADDRS _IOW('i', 101, struct ifreq)
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#define GRESADDRD _IOW('i', 102, struct ifreq)
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#define GREGADDRS _IOWR('i', 103, struct ifreq)
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#define GREGADDRD _IOWR('i', 104, struct ifreq)
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#define GRESPROTO _IOW('i' , 105, struct ifreq)
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#define GREGPROTO _IOWR('i', 106, struct ifreq)
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#define GREGKEY _IOWR('i', 107, struct ifreq)
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#define GRESKEY _IOW('i', 108, struct ifreq)
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#define GREGOPTS _IOWR('i', 109, struct ifreq)
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#define GRESOPTS _IOW('i', 110, struct ifreq)
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#define GRE_ENABLE_CSUM 0x0001
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#define GRE_ENABLE_SEQ 0x0002
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#define GRE_OPTMASK (GRE_ENABLE_CSUM|GRE_ENABLE_SEQ)
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#endif /* _NET_IF_GRE_H_ */
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