/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* 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 $
*/
#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;
struct greudp {
struct ip gi_ip;
struct udphdr gi_udp;
struct grehdr gi_gre;
} __packed;
#endif /* INET */
#ifdef INET6
struct greip6 {
struct ip6_hdr gi6_ip6;
struct grehdr gi6_gre;
} __packed;
struct greudp6 {
struct ip6_hdr gi6_ip6;
struct udphdr gi6_udp;
struct grehdr gi6_gre;
} __packed;
#endif /* INET6 */
CK_LIST_HEAD(gre_list, gre_softc);
CK_LIST_HEAD(gre_sockets, gre_socket);
struct gre_socket {
struct socket *so;
struct gre_list list;
CK_LIST_ENTRY(gre_socket) chain;
struct epoch_context epoch_ctx;
};
struct gre_softc {
struct ifnet *gre_ifp;
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_csumflags;
uint32_t gre_port;
u_int gre_fibnum;
u_int gre_hlen; /* header size */
union {
void *hdr;
#ifdef INET
struct greip *iphdr;
struct greudp *udphdr;
#endif
#ifdef INET6
struct greip6 *ip6hdr;
struct greudp6 *udp6hdr;
#endif
} gre_uhdr;
struct gre_socket *gre_so;
CK_LIST_ENTRY(gre_softc) chain;
CK_LIST_ENTRY(gre_softc) srchash;
};
MALLOC_DECLARE(M_GRE);
#ifndef GRE_HASH_SIZE
#define GRE_HASH_SIZE (1 << 4)
#endif
#define GRE2IFP(sc) ((sc)->gre_ifp)
#define GRE_RLOCK_TRACKER struct epoch_tracker gre_et
#define GRE_RLOCK() epoch_enter_preempt(net_epoch_preempt, &gre_et)
#define GRE_RUNLOCK() epoch_exit_preempt(net_epoch_preempt, &gre_et)
#define GRE_WAIT() epoch_wait_preempt(net_epoch_preempt)
#define gre_hdr gre_uhdr.hdr
#define gre_iphdr gre_uhdr.iphdr
#define gre_ip6hdr gre_uhdr.ip6hdr
#define gre_udphdr gre_uhdr.udphdr
#define gre_udp6hdr gre_uhdr.udp6hdr
#define gre_oip gre_iphdr->gi_ip
#define gre_udp gre_udphdr->gi_udp
#define gre_oip6 gre_ip6hdr->gi6_ip6
#define gre_udp6 gre_udp6hdr->gi6_udp
struct gre_list *gre_hashinit(void);
void gre_hashdestroy(struct gre_list *);
int gre_input(struct mbuf *, int, int, void *);
void gre_update_hdr(struct gre_softc *, struct grehdr *);
void gre_update_udphdr(struct gre_softc *, struct udphdr *, uint16_t);
void gre_sofree(epoch_context_t);
void in_gre_init(void);
void in_gre_uninit(void);
int in_gre_setopts(struct gre_softc *, u_long, uint32_t);
int in_gre_ioctl(struct gre_softc *, u_long, caddr_t);
int in_gre_output(struct mbuf *, int, int);
void in6_gre_init(void);
void in6_gre_uninit(void);
int in6_gre_setopts(struct gre_softc *, u_long, uint32_t);
int in6_gre_ioctl(struct gre_softc *, u_long, caddr_t);
int in6_gre_output(struct mbuf *, int, int, uint32_t);
/*
* 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 GREGPORT _IOWR('i', 111, struct ifreq)
#define GRESPORT _IOW('i', 112, struct ifreq)
/* GRE-in-UDP encapsulation destination port as defined in RFC8086 */
#define GRE_UDPPORT 4754
#define GRE_ENABLE_CSUM 0x0001
#define GRE_ENABLE_SEQ 0x0002
#define GRE_UDPENCAP 0x0004
#define GRE_OPTMASK (GRE_ENABLE_CSUM|GRE_ENABLE_SEQ|GRE_UDPENCAP)
#endif /* _NET_IF_GRE_H_ */
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