104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/* $NetBSD: print-mobile.c,v 1.2 1998/09/30 08:57:01 hwr Exp $ */
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/*
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* (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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/* \summary: IPv4 mobility printer */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.h"
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#define MOBILE_SIZE (8)
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struct mobile_ip {
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uint16_t proto;
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uint16_t hcheck;
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uint32_t odst;
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uint32_t osrc;
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};
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#define OSRC_PRES 0x0080 /* old source is present */
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/*
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* Deencapsulate and print a mobile-tunneled IP datagram
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*/
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void
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mobile_print(netdissect_options *ndo, const u_char *bp, u_int length)
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{
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const struct mobile_ip *mob;
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struct cksum_vec vec[1];
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u_short proto,crc;
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u_char osp =0; /* old source address present */
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mob = (const struct mobile_ip *)bp;
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if (length < MOBILE_SIZE || !ND_TTEST(*mob)) {
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ND_PRINT((ndo, "[|mobile]"));
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return;
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}
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ND_PRINT((ndo, "mobile: "));
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proto = EXTRACT_16BITS(&mob->proto);
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crc = EXTRACT_16BITS(&mob->hcheck);
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if (proto & OSRC_PRES) {
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osp=1;
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}
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if (osp) {
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ND_PRINT((ndo, "[S] "));
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if (ndo->ndo_vflag)
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ND_PRINT((ndo, "%s ", ipaddr_string(ndo, &mob->osrc)));
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} else {
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ND_PRINT((ndo, "[] "));
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}
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if (ndo->ndo_vflag) {
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ND_PRINT((ndo, "> %s ", ipaddr_string(ndo, &mob->odst)));
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ND_PRINT((ndo, "(oproto=%d)", proto>>8));
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}
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vec[0].ptr = (const uint8_t *)(const void *)mob;
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vec[0].len = osp ? 12 : 8;
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if (in_cksum(vec, 1)!=0) {
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ND_PRINT((ndo, " (bad checksum %d)", crc));
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}
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}
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