nexmon – Rev 1

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/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef INET6

#include <tcpdump-stdinc.h>

#include "ip6.h"
#include "interface.h"
#include "extract.h"

int
frag6_print(netdissect_options *ndo, register const u_char *bp, register const u_char *bp2)
{
        register const struct ip6_frag *dp;
        register const struct ip6_hdr *ip6;

        dp = (const struct ip6_frag *)bp;
        ip6 = (const struct ip6_hdr *)bp2;

        ND_TCHECK(dp->ip6f_offlg);

        if (ndo->ndo_vflag) {
                ND_PRINT((ndo, "frag (0x%08x:%d|%ld)",
                       EXTRACT_32BITS(&dp->ip6f_ident),
                       EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
                       sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
                               (long)(bp - bp2) - sizeof(struct ip6_frag)));
        } else {
                ND_PRINT((ndo, "frag (%d|%ld)",
                       EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
                       sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
                               (long)(bp - bp2) - sizeof(struct ip6_frag)));
        }

        /* it is meaningless to decode non-first fragment */
        if ((EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK) != 0)
                return -1;
        else
        {
                ND_PRINT((ndo, " "));
                return sizeof(struct ip6_frag);
        }
trunc:
        ND_PRINT((ndo, "[|frag]"));
        return -1;
}
#endif /* INET6 */