/*      $OpenBSD: print-frag6.c,v 1.11 2022/01/05 05:35:19 dlg Exp $    */

/*
 * 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.
 */

#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>

#include <net/if.h>

#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>

#include <stdio.h>

#include <netinet/ip6.h>

#include "interface.h"
#include "addrtoname.h"

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

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

        TCHECK(dp->ip6f_ident);

        printf("frag (0x%08x:%ld@%d%s)",
            ntohl(dp->ip6f_ident),
            sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
                (long)(bp - bp2) - sizeof(struct ip6_frag),
            ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
            (dp->ip6f_offlg & IP6F_MORE_FRAG) ? "+" : "");

        /* it is meaningless to decode non-first fragment */
        if (ntohs(dp->ip6f_offlg & IP6F_OFF_MASK) != 0)
                return 65535;
        else
        {
                printf(" ");
                return sizeof(struct ip6_frag);
        }
trunc:
        printf("[|frag]");
        return 65535;
}