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/* $NetBSD: if_gre.h,v 1.50 2021/12/03 13:27:39 andvar Exp $ */
/*
* Copyright (c) 1998, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Heiko W.Rupp <hwr@pilhuhn.de>
*
* This code is derived from software contributed to The NetBSD Foundation
* by David Young <dyoung@NetBSD.org>
*
* 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.
*
* This material is based upon work partially supported by NSF
* under Contract No. NSF CNS-0626584.
*/
#ifndef _NET_IF_GRE_H_
#define _NET_IF_GRE_H_
#include <sys/ioccom.h>
#include <sys/evcnt.h>
#include <sys/queue.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/malloc.h>
#include <sys/mallocvar.h>
#ifdef _KERNEL
#include <sys/pcq.h>
struct gre_soparm {
struct socket *sp_so;
struct sockaddr_storage sp_src; /* source of gre packets */
struct sockaddr_storage sp_dst; /* destination of gre packets */
int sp_type; /* encapsulating socket type */
int sp_proto; /* encapsulating protocol */
bool sp_bysock; /* encapsulation configured by passing
* socket, not by SIOCSLIFPHYADDR
*/
};
enum gre_state {
GRE_S_IDLE = 0
, GRE_S_IOCTL
, GRE_S_DIE
};
struct gre_bufq {
pcq_t *bq_q;
volatile int bq_drops;
};
enum gre_msg {
GRE_M_NONE = 0
, GRE_M_SETFP
, GRE_M_DELFP
, GRE_M_STOP
, GRE_M_OK
, GRE_M_ERR
};
struct gre_softc {
struct ifnet sc_if;
kmutex_t sc_mtx;
kcondvar_t sc_condvar;
kcondvar_t sc_fp_condvar;
struct gre_bufq sc_snd;
struct gre_soparm sc_soparm;
volatile enum gre_state sc_state;
volatile int sc_waiters;
volatile int sc_fp_waiters;
void *sc_si;
struct evcnt sc_recv_ev;
struct evcnt sc_send_ev;
struct evcnt sc_block_ev;
struct evcnt sc_error_ev;
struct evcnt sc_pullup_ev;
struct evcnt sc_unsupp_ev;
struct evcnt sc_oflow_ev;
file_t * volatile sc_fp;
volatile enum gre_msg sc_msg;
int sc_fd;
};
struct gre_h {
uint16_t flags; /* GRE flags */
uint16_t ptype; /* protocol type of payload typically
* ethernet protocol type
*/
/*
* from here on: fields are optional, presence indicated by flags
*
u_int_16 checksum checksum (one-complements of GRE header
and payload
Present if (ck_pres | rt_pres == 1).
Valid if (ck_pres == 1).
u_int_16 offset offset from start of routing field to
first octet of active SRE (see below).
Present if (ck_pres | rt_pres == 1).
Valid if (rt_pres == 1).
u_int_32 key inserted by encapsulator e.g. for
authentication
Present if (key_pres ==1 ).
u_int_32 seq_num Sequence number to allow for packet order
Present if (seq_pres ==1 ).
struct gre_sre[] routing Routing fields (see below)
Present if (rt_pres == 1)
*/
};
#define GRE_CP 0x8000 /* Checksum Present */
#define GRE_RP 0x4000 /* Routing Present */
#define GRE_KP 0x2000 /* Key Present */
#define GRE_SP 0x1000 /* Sequence Present */
#define GRE_SS 0x0800 /* Strict Source Route */
/*
* gre_sre defines a Source route Entry. These are needed if packets
* should be routed over more than one tunnel hop by hop
*/
struct gre_sre {
uint16_t sre_family; /* address family */
u_char sre_offset; /* offset to first octet of active entry */
u_char sre_length; /* number of octets in the SRE.
sre_lengthl==0 -> last entry. */
u_char *sre_rtinfo; /* the routing information */
};
#define GRE_TTL 30
extern int ip_gre_ttl;
#endif /* _KERNEL */
/*
* ioctls needed to manipulate the interface
*/
#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 GRESSOCK _IOW('i', 107, struct ifreq)
#define GREDSOCK _IOW('i', 108, struct ifreq)
#endif /* !_NET_IF_GRE_H_ */
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