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067f7dd17d
Print "[length < 0] (invalid)" when fragment length is negative. In this case, e.g. when IPv6 payload length is zero, the 32-bit and 64-bit printouts were different. Example: 32-bit: frag (0x80000074:1280|4294967288) --- 64-bit: frag (0x80000074:1280|18446744073709551608) Add a test file.
63 lines
2.2 KiB
C
63 lines
2.2 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: IPv6 fragmentation header printer */
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#include <config.h>
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#include "netdissect-stdinc.h"
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#include "netdissect.h"
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#include "extract.h"
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#include "ip6.h"
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int
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frag6_print(netdissect_options *ndo, const u_char *bp, const u_char *bp2)
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{
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const struct ip6_frag *dp;
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const struct ip6_hdr *ip6;
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ndo->ndo_protocol = "frag6";
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dp = (const struct ip6_frag *)bp;
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ip6 = (const struct ip6_hdr *)bp2;
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ND_PRINT("frag (");
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if (ndo->ndo_vflag)
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ND_PRINT("0x%08x:", GET_BE_U_4(dp->ip6f_ident));
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ND_PRINT("%u|", GET_BE_U_2(dp->ip6f_offlg) & IP6F_OFF_MASK);
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if ((bp - bp2) + sizeof(struct ip6_frag) >
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sizeof(struct ip6_hdr) + GET_BE_U_2(ip6->ip6_plen))
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ND_PRINT("[length < 0] (invalid))");
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else
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ND_PRINT("%zu)",
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sizeof(struct ip6_hdr) + GET_BE_U_2(ip6->ip6_plen) -
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(bp - bp2) - sizeof(struct ip6_frag));
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/* it is meaningless to decode non-first fragment */
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if ((GET_BE_U_2(dp->ip6f_offlg) & IP6F_OFF_MASK) != 0)
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return -1;
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else {
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ND_PRINT(" ");
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return sizeof(struct ip6_frag);
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}
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}
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