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https://github.com/the-tcpdump-group/tcpdump.git
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9ec0a1a346
Enable ND_LONGJMP_FROM_TCHECK. Add and use a standard invalid section. Test bounds if not decoding the packet fully. Lose a variable, fixup indentation and simplify some code.
131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/*
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* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
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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: Broadcom LI 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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#define ND_LONGJMP_FROM_TCHECK
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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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#define BCM_LI_SHIM_LEN 4
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static const struct tok bcm_li_direction_values[] = {
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{ 1, "unused" },
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{ 2, "egress" },
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{ 3, "ingress" },
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{ 0, NULL}
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};
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#define BCM_LI_PKT_TYPE_UNDECIDED 4
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#define BCM_LI_PKT_TYPE_IPV4 5
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#define BCM_LI_PKT_TYPE_IPV6 6
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#define BCM_LI_PKT_TYPE_ETHERNET 7
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static const struct tok bcm_li_pkt_type_values[] = {
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{ BCM_LI_PKT_TYPE_UNDECIDED, "undecided" },
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{ BCM_LI_PKT_TYPE_IPV4, "ipv4" },
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{ BCM_LI_PKT_TYPE_IPV6, "ipv6" },
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{ BCM_LI_PKT_TYPE_ETHERNET, "ethernet" },
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{ 0, NULL}
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};
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static const struct tok bcm_li_pkt_subtype_values[] = {
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{ 1, "single VLAN tag" },
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{ 2, "double VLAN tag" },
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{ 3, "untagged" },
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{ 0, NULL}
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};
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void
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bcm_li_print(netdissect_options *ndo,
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const u_char *bp, u_int length)
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{
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u_int shim, direction, pkt_type, pkt_subtype, li_id;
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ndo->ndo_protocol = "bcm_li";
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if (length < BCM_LI_SHIM_LEN) {
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ND_PRINT(" (length %u < %u)", length, BCM_LI_SHIM_LEN);
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goto invalid;
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}
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shim = GET_BE_U_4(bp);
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direction = (shim >> 29) & 0x7;
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pkt_type = (shim >> 25) & 0xf;
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pkt_subtype = (shim >> 22) & 0x7;
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li_id = shim & 0x3fffff;
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length -= BCM_LI_SHIM_LEN;
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bp += BCM_LI_SHIM_LEN;
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ND_PRINT("%sBCM-LI-SHIM: direction %s, pkt-type %s, pkt-subtype %s, li-id %u%s",
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ndo->ndo_vflag ? "\n " : "",
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tok2str(bcm_li_direction_values, "unknown", direction),
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tok2str(bcm_li_pkt_type_values, "unknown", pkt_type),
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tok2str(bcm_li_pkt_subtype_values, "unknown", pkt_subtype),
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li_id,
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ndo->ndo_vflag ? "\n ": "");
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if (!ndo->ndo_vflag) {
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ND_TCHECK_LEN(bp, length);
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return;
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}
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switch (pkt_type) {
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case BCM_LI_PKT_TYPE_ETHERNET:
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ether_print(ndo, bp, length, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
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break;
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case BCM_LI_PKT_TYPE_IPV4:
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ip_print(ndo, bp, length);
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break;
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case BCM_LI_PKT_TYPE_IPV6:
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ip6_print(ndo, bp, length);
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break;
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case BCM_LI_PKT_TYPE_UNDECIDED:
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/*
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* Guess IP version from first nibble.
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*/
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if ((GET_U_1(bp) >> 4) == 4) {
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ip_print(ndo, bp, length);
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} else if ((GET_U_1(bp) >> 4) == 6) {
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ip6_print(ndo, bp, length);
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} else {
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ND_PRINT("unknown payload");
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}
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break;
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default:
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goto invalid;
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}
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return;
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invalid:
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nd_print_invalid(ndo);
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}
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