GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/tcpdump/print-mobile.c Lines: 0 28 0.0 %
Date: 2017-11-13 Branches: 0 16 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: print-mobile.c,v 1.5 2015/01/16 06:40:21 deraadt Exp $ */
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/*	$NetBSD: print-mobile.c,v 1.3 1999/07/26 06:11:57 itojun 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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 *
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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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#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/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_int32_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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