144 lines
3.9 KiB
C
144 lines
3.9 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-mobile.c,v 1.2.2.1 2000/01/11 06:58:26 fenner Exp $";
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netdb.h>
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#include <stdio.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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#define MOBILE_SIZE (8)
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struct mobile_ip {
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u_int16_t proto;
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u_int16_t hcheck;
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u_int32_t odst;
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u_int32_t osrc;
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};
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#define OSRC_PRES 0x0080 /* old source is present */
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static u_int16_t mob_in_cksum(u_short *p, int len);
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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(const u_char *bp, u_int length)
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{
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const u_char *cp = bp +8 ;
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const struct mobile_ip *mob;
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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) {
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fputs("[|mobile]", stdout);
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return;
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}
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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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cp +=4 ;
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}
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if (osp) {
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fputs("[S] ",stdout);
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if (vflag)
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(void)printf("%s ",ipaddr_string(&mob->osrc));
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} else {
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fputs("[] ",stdout);
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}
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if (vflag) {
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(void)printf("> %s ",ipaddr_string(&mob->odst));
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(void)printf("(oproto=%d)",proto>>8);
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}
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if (mob_in_cksum((u_short *)mob, osp ? 12 : 8)!=0) {
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(void)printf(" (bad checksum %d)",crc);
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}
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return;
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}
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static u_int16_t mob_in_cksum(u_short *p, int len)
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{
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u_int32_t sum = 0;
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int nwords = len >> 1;
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while (nwords-- != 0)
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sum += *p++;
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if (len & 1) {
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union {
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u_int16_t w;
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u_int8_t c[2];
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} u;
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u.c[0] = *(u_char *)p;
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u.c[1] = 0;
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sum += u.w;
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}
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/* end-around-carry */
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sum = (sum >> 16) + (sum & 0xffff);
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sum += (sum >> 16);
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return (~sum);
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}
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