mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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123 lines
3.3 KiB
C
123 lines
3.3 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 routing header printer */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include <string.h>
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.h"
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#include "ip6.h"
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int
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rt6_print(netdissect_options *ndo, const u_char *bp, const u_char *bp2 _U_)
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{
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const struct ip6_rthdr *dp;
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const struct ip6_rthdr0 *dp0;
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const struct ip6_srh *srh;
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const u_char *ep;
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u_int i, len, type;
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const struct in6_addr *addr;
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dp = (const struct ip6_rthdr *)bp;
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/* 'ep' points to the end of available data. */
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ep = ndo->ndo_snapend;
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ND_TCHECK(dp->ip6r_segleft);
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len = EXTRACT_U_1(dp->ip6r_len);
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ND_PRINT("srcrt (len=%u", len); /*)*/
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type = EXTRACT_U_1(dp->ip6r_type);
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ND_PRINT(", type=%u", type);
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ND_PRINT(", segleft=%u", EXTRACT_U_1(dp->ip6r_segleft));
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switch (type) {
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case IPV6_RTHDR_TYPE_0:
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case IPV6_RTHDR_TYPE_2: /* Mobile IPv6 ID-20 */
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dp0 = (const struct ip6_rthdr0 *)dp;
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ND_TCHECK(dp0->ip6r0_reserved);
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if (EXTRACT_BE_U_4(dp0->ip6r0_reserved) || ndo->ndo_vflag) {
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ND_PRINT(", rsv=0x%0x",
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EXTRACT_BE_U_4(dp0->ip6r0_reserved));
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}
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if (len % 2 == 1)
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goto trunc;
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len >>= 1;
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addr = &dp0->ip6r0_addr[0];
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for (i = 0; i < len; i++) {
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if ((const u_char *)(addr + 1) > ep)
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goto trunc;
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ND_PRINT(", [%d]%s", i, ip6addr_string(ndo, addr));
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addr++;
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}
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/*(*/
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ND_PRINT(") ");
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return((EXTRACT_U_1(dp0->ip6r0_len) + 1) << 3);
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break;
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case IPV6_RTHDR_TYPE_4:
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srh = (const struct ip6_srh *)dp;
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ND_PRINT(", last-entry=%u", EXTRACT_U_1(srh->srh_last_ent));
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ND_TCHECK(srh->srh_flags);
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if (EXTRACT_U_1(srh->srh_flags) || ndo->ndo_vflag) {
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ND_PRINT(", flags=0x%0x",
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EXTRACT_U_1(srh->srh_flags));
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}
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ND_PRINT(", tag=%x", EXTRACT_BE_U_2(srh->srh_tag));
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if (len % 2 == 1)
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goto trunc;
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len >>= 1;
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addr = &srh->srh_segments[0];
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for (i = 0; i < len; i++) {
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if ((const u_char *)(addr + 1) > ep)
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goto trunc;
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ND_PRINT(", [%d]%s", i, ip6addr_string(ndo, addr));
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addr++;
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}
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/*(*/
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ND_PRINT(") ");
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return((EXTRACT_U_1(srh->srh_len) + 1) << 3);
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break;
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default:
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goto trunc;
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break;
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}
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trunc:
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ND_PRINT("[|srcrt]");
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return -1;
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}
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