diff options
Diffstat (limited to 'usr.sbin/tcpdump/print-mobile.c')
| -rw-r--r-- | usr.sbin/tcpdump/print-mobile.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/usr.sbin/tcpdump/print-mobile.c b/usr.sbin/tcpdump/print-mobile.c new file mode 100644 index 00000000000..33b35e7a268 --- /dev/null +++ b/usr.sbin/tcpdump/print-mobile.c @@ -0,0 +1,142 @@ +/* $OpenBSD: print-mobile.c,v 1.1 2000/01/16 11:20:14 jakob Exp $ */ +/* $NetBSD: print-mobile.c,v 1.3 1999/07/26 06:11:57 itojun 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. + */ + +#if 0 +#include <sys/cdefs.h> +#ifndef lint +__RCSID("$NetBSD: print-mobile.c,v 1.3 1999/07/26 06:11:57 itojun Exp $"); +#endif +#endif + +#include <sys/param.h> +#include <sys/time.h> +#include <sys/uio.h> +#include <sys/socket.h> + +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> + +#include <netdb.h> +#include <stdio.h> + +#include "interface.h" +#include "addrtoname.h" +#include "extract.h" /* must come after interface.h */ + +#define MOBILE_SIZE (8) + +struct mobile_ip { + u_int16_t proto; + u_int16_t hcheck; + u_int32_t odst; + u_int32_t osrc; +}; + +#define OSRC_PRES 0x0080 /* old source is present */ + +static u_int16_t mob_in_cksum(u_short *p, int len); + +/* + * Deencapsulate and print a mobile-tunneled IP datagram + */ +void +mobile_print(const u_char *bp, u_int length) +{ + const u_char *cp = bp +8 ; + const struct mobile_ip *mob; + u_short proto,crc; + u_char osp =0; /* old source address present */ + + mob = (const struct mobile_ip *)bp; + + if (length < MOBILE_SIZE) { + fputs("[|mobile]", stdout); + return; + } + + proto = EXTRACT_16BITS(&mob->proto); + crc = EXTRACT_16BITS(&mob->hcheck); + if (proto & OSRC_PRES) { + osp=1; + cp +=4 ; + } + + if (osp) { + fputs("[S] ",stdout); + if (vflag) + (void)printf("%s ",ipaddr_string(&mob->osrc)); + } else { + fputs("[] ",stdout); + } + if (vflag) { + (void)printf("> %s ",ipaddr_string(&mob->odst)); + (void)printf("(oproto=%d)",proto>>8); + } + if (mob_in_cksum((u_short *)mob, osp ? 12 : 8)!=0) { + (void)printf(" (bad checksum %d)",crc); + } + + return; +} + +static u_int16_t mob_in_cksum(u_short *p, int len) +{ + u_int32_t sum = 0; + int nwords = len >> 1; + + while (nwords-- != 0) + sum += *p++; + + if (len & 1) { + union { + u_int16_t w; + u_int32_t c[2]; + } u; + u.c[0] = *(u_char *)p; + u.c[1] = 0; + sum += u.w; + } + + /* end-around-carry */ + sum = (sum >> 16) + (sum & 0xffff); + sum += (sum >> 16); + return (~sum); +} + |