/*      NetBSD: print-mobile.c,v 1.2 1998/09/30 08:57:01 hwr 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 <[email protected]>
*
* 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.
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-mobile.c,v 1.8 2024/09/02 16:15:32 christos Exp $");
#endif

/* \summary: IPv4 mobility printer */

#include <config.h>

#include "netdissect-stdinc.h"

#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"

#define MOBILE_SIZE (8)

struct mobile_ip {
       nd_uint16_t proto;
       nd_uint16_t hcheck;
       nd_uint32_t odst;
       nd_uint32_t osrc;
};

#define OSRC_PRES       0x0080  /* old source is present */

/*
* Deencapsulate and print a mobile-tunneled IP datagram
*/
void
mobile_print(netdissect_options *ndo, const u_char *bp, u_int length)
{
       const struct mobile_ip *mob;
       struct cksum_vec vec[1];
       u_short proto,crc;
       u_char osp =0;                  /* old source address present */

       ndo->ndo_protocol = "mobile";
       mob = (const struct mobile_ip *)bp;

       if (length < MOBILE_SIZE || !ND_TTEST_SIZE(mob)) {
               nd_print_trunc(ndo);
               return;
       }
       ND_PRINT("mobile: ");

       proto = GET_BE_U_2(mob->proto);
       crc =  GET_BE_U_2(mob->hcheck);
       if (proto & OSRC_PRES) {
               osp=1;
       }

       if (osp)  {
               ND_PRINT("[S] ");
               if (ndo->ndo_vflag)
                       ND_PRINT("%s ", GET_IPADDR_STRING(mob->osrc));
       } else {
               ND_PRINT("[] ");
       }
       if (ndo->ndo_vflag) {
               ND_PRINT("> %s ", GET_IPADDR_STRING(mob->odst));
               ND_PRINT("(oproto=%u)", proto>>8);
       }
       vec[0].ptr = (const uint8_t *)(const void *)mob;
       vec[0].len = osp ? 12 : 8;
       if (in_cksum(vec, 1)!=0) {
               ND_PRINT(" (bad checksum %u)", crc);
       }
}