Home | History | Annotate | Line # | Download | only in dist 
      1 /*	NetBSD: print-mobile.c,v 1.2 1998/09/30 08:57:01 hwr Exp  */
      2 
      3 /*
      4  * (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Heiko W.Rupp <hwr (at) pilhuhn.de>
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #ifndef lint
     41 __RCSID("$NetBSD: print-mobile.c,v 1.8 2024/09/02 16:15:32 christos Exp $");
     42 #endif
     43 
     44 /* \summary: IPv4 mobility printer */
     45 
     46 #include <config.h>
     47 
     48 #include "netdissect-stdinc.h"
     49 
     50 #include "netdissect.h"
     51 #include "addrtoname.h"
     52 #include "extract.h"
     53 
     54 #define MOBILE_SIZE (8)
     55 
     56 struct mobile_ip {
     57 	nd_uint16_t proto;
     58 	nd_uint16_t hcheck;
     59 	nd_uint32_t odst;
     60 	nd_uint32_t osrc;
     61 };
     62 
     63 #define OSRC_PRES	0x0080	/* old source is present */
     64 
     65 /*
     66  * Deencapsulate and print a mobile-tunneled IP datagram
     67  */
     68 void
     69 mobile_print(netdissect_options *ndo, const u_char *bp, u_int length)
     70 {
     71 	const struct mobile_ip *mob;
     72 	struct cksum_vec vec[1];
     73 	u_short proto,crc;
     74 	u_char osp =0;			/* old source address present */
     75 
     76 	ndo->ndo_protocol = "mobile";
     77 	mob = (const struct mobile_ip *)bp;
     78 
     79 	if (length < MOBILE_SIZE || !ND_TTEST_SIZE(mob)) {
     80 		nd_print_trunc(ndo);
     81 		return;
     82 	}
     83 	ND_PRINT("mobile: ");
     84 
     85 	proto = GET_BE_U_2(mob->proto);
     86 	crc =  GET_BE_U_2(mob->hcheck);
     87 	if (proto & OSRC_PRES) {
     88 		osp=1;
     89 	}
     90 
     91 	if (osp)  {
     92 		ND_PRINT("[S] ");
     93 		if (ndo->ndo_vflag)
     94 			ND_PRINT("%s ", GET_IPADDR_STRING(mob->osrc));
     95 	} else {
     96 		ND_PRINT("[] ");
     97 	}
     98 	if (ndo->ndo_vflag) {
     99 		ND_PRINT("> %s ", GET_IPADDR_STRING(mob->odst));
    100 		ND_PRINT("(oproto=%u)", proto>>8);
    101 	}
    102 	vec[0].ptr = (const uint8_t *)(const void *)mob;
    103 	vec[0].len = osp ? 12 : 8;
    104 	if (in_cksum(vec, 1)!=0) {
    105 		ND_PRINT(" (bad checksum %u)", crc);
    106 	}
    107 }
    108