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/* $NetBSD: print-mobile.c,v 1.2 1998/09/30 08:57:01 hwr Exp $ */
/*
* (c) 1998 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>
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
*/
/* \summary: IPv4 mobility printer */
#include <config.h>
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#define MOBILE_SIZE (8)
struct mobile_ip {
nd_uint16_t proto;
nd_uint16_t hcheck;
nd_uint32_t odst;
nd_uint32_t osrc;
};
#define OSRC_PRES 0x0080 /* old source is present */
/*
* Deencapsulate and print a mobile-tunneled IP datagram
*/
void
mobile_print(netdissect_options *ndo, const u_char *bp, u_int length)
{
const struct mobile_ip *mob;
struct cksum_vec vec[1];
u_short proto,crc;
u_char osp =0; /* old source address present */
ndo->ndo_protocol = "mobile";
mob = (const struct mobile_ip *)bp;
if (length < MOBILE_SIZE || !ND_TTEST_SIZE(mob)) {
nd_print_trunc(ndo);
return;
}
ND_PRINT("mobile: ");
proto = GET_BE_U_2(mob->proto);
crc = GET_BE_U_2(mob->hcheck);
if (proto & OSRC_PRES) {
osp=1;
}
if (osp) {
ND_PRINT("[S] ");
if (ndo->ndo_vflag)
ND_PRINT("%s ", GET_IPADDR_STRING(mob->osrc));
} else {
ND_PRINT("[] ");
}
if (ndo->ndo_vflag) {
ND_PRINT("> %s ", GET_IPADDR_STRING(mob->odst));
ND_PRINT("(oproto=%u)", proto>>8);
}
vec[0].ptr = (const uint8_t *)(const void *)mob;
vec[0].len = osp ? 12 : 8;
if (in_cksum(vec, 1)!=0) {
ND_PRINT(" (bad checksum %u)", crc);
}
}
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