bdae44a844
- Add gre_mtx to protect global softc list. - Hold gre_mtx over various list operations (insert, delete). - Centralize if_gre interface teardown in gre_destroy(), and call this from modevent unload and gre_clone_destroy(). - Export gre_mtx to ip_gre.c, which walks the gre list to look up gre interfaces during encapsulation. Add a wonking comment on how we need some sort of drain/reference count mechanism to keep gre references alive while in use and simultaneous destroy. This commit does not lockdown softc data, which follows in a future commit.
186 lines
5.7 KiB
C
186 lines
5.7 KiB
C
/* $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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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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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#ifndef _NET_IF_GRE_H
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#define _NET_IF_GRE_H
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#include <sys/ioccom.h>
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#ifdef _KERNEL
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#include <sys/queue.h>
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/*
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* Version of the WCCP, need to be configured manually since
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* header for version 2 is the same but IP payload is prepended
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* with additional 4-bytes field.
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*/
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typedef enum {
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WCCP_V1 = 0,
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WCCP_V2
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} wccp_ver_t;
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struct gre_softc {
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struct ifnet sc_if;
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LIST_ENTRY(gre_softc) sc_list;
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int gre_unit;
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int gre_flags;
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struct in_addr g_src; /* source address of gre packets */
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struct in_addr g_dst; /* destination address of gre packets */
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struct route route; /* routing entry that determines, where a
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encapsulated packet should go */
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u_char g_proto; /* protocol of encapsulator */
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const struct encaptab *encap; /* encapsulation cookie */
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int called; /* infinite recursion preventer */
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wccp_ver_t wccp_ver; /* version of the WCCP */
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};
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struct gre_h {
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u_int16_t flags; /* GRE flags */
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u_int16_t ptype; /* protocol type of payload typically
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Ether protocol type*/
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/*
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* from here on: fields are optional, presence indicated by flags
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*
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u_int_16 checksum checksum (one-complements of GRE header
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and payload
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Present if (ck_pres | rt_pres == 1).
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Valid if (ck_pres == 1).
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u_int_16 offset offset from start of routing filed to
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first octet of active SRE (see below).
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Present if (ck_pres | rt_pres == 1).
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Valid if (rt_pres == 1).
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u_int_32 key inserted by encapsulator e.g. for
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authentication
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Present if (key_pres ==1 ).
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u_int_32 seq_num Sequence number to allow for packet order
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Present if (seq_pres ==1 ).
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struct gre_sre[] routing Routing fileds (see below)
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Present if (rt_pres == 1)
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*/
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} __packed;
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struct greip {
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struct ip gi_i;
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struct gre_h gi_g;
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} __packed;
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#define gi_pr gi_i.ip_p
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#define gi_len gi_i.ip_len
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#define gi_src gi_i.ip_src
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#define gi_dst gi_i.ip_dst
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#define gi_ptype gi_g.ptype
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#define gi_flags gi_g.flags
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#define GRE_CP 0x8000 /* Checksum Present */
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#define GRE_RP 0x4000 /* Routing Present */
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#define GRE_KP 0x2000 /* Key Present */
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#define GRE_SP 0x1000 /* Sequence Present */
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#define GRE_SS 0x0800 /* Strict Source Route */
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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 WCCP_PROTOCOL_TYPE 0x883E
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/*
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* gre_sre defines a Source route Entry. These are needed if packets
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* should be routed over more than one tunnel hop by hop
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*/
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struct gre_sre {
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u_int16_t sre_family; /* address family */
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u_char sre_offset; /* offset to first octet of active entry */
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u_char sre_length; /* number of octets in the SRE.
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sre_lengthl==0 -> last entry. */
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u_char *sre_rtinfo; /* the routing information */
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};
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struct greioctl {
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int unit;
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struct in_addr addr;
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};
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/* for mobile encaps */
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struct mobile_h {
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u_int16_t proto; /* protocol and S-bit */
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u_int16_t hcrc; /* header checksum */
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u_int32_t odst; /* original destination address */
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u_int32_t osrc; /* original source addr, if S-bit set */
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} __packed;
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struct mobip_h {
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struct ip mi;
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struct mobile_h mh;
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} __packed;
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#define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t))
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#define MOB_H_SIZ_L (sizeof(struct mobile_h))
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#define MOB_H_SBIT 0x0080
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#define GRE_TTL 30
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#endif /* _KERNEL */
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/*
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* ioctls needed to manipulate the interface
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*/
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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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#ifdef _KERNEL
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LIST_HEAD(gre_softc_head, gre_softc);
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extern struct mtx gre_mtx;
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extern struct gre_softc_head gre_softc_list;
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u_int16_t gre_in_cksum(u_int16_t *, u_int);
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#endif /* _KERNEL */
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#endif
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