a7d662b71c
Don't copy ttl from the inner packet to the encapsulating packet. Make the outer ttl sysctl'able. This should close PR 14269 from Jasper Wallace (change partly from there) and it makes traceroute work over gre tunnels.
161 lines
5.3 KiB
C
161 lines
5.3 KiB
C
/* $NetBSD: if_gre.h,v 1.10 2002/02/24 17:22:20 martin Exp $ */
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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/queue.h>
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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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};
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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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} __attribute__((__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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} __attribute__((__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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* 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; /* adress 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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} __attribute__((__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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} __attribute__((__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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extern int ip_gre_ttl;
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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 gre_softc_head gre_softc_list;
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int gre_ioctl __P((struct ifnet *, u_long, caddr_t));
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int gre_output __P((struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *rt));
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u_short gre_in_cksum(u_short *p, u_int len);
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#endif /* _KERNEL */
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#endif
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