196 lines
5.5 KiB
C
Executable File
196 lines
5.5 KiB
C
Executable File
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include "interface.h"
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#include "ether.h"
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#include "ethertype.h"
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#include "extract.h" /* must come after interface.h */
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static const char tstr[] = "[|MEDSA]";
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/*
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* Marvell Extended Distributed Switch Archiecture.
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*
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* A Marvell propriatary header used for passing packets to/from
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* specific ports of a switch. There is no open specification of this
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* header, but is documented in the Marvell Switch data sheets. For
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* background, see:
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*
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* https://lwn.net/Articles/302333/
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*/
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struct medsa_pkthdr {
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u_char bytes[6];
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u_short ether_type;
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};
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/* Bytes 0 and 1 are reserved and should contain 0 */
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#define TAG(medsa) (medsa->bytes[2] >> 6)
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#define TAG_TO_CPU 0
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#define TAG_FROM_CPU 1
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#define TAG_FORWARD 3
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#define SRC_TAG(medsa) ((medsa->bytes[2] >> 5) & 0x01)
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#define SRC_DEV(medsa) (medsa->bytes[2] & 0x1f)
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#define SRC_PORT(medsa) ((medsa->bytes[3] >> 3) & 0x01f)
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#define TRUNK(medsa) ((medsa->bytes[3] >> 2) & 0x01)
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#define CODE(medsa) ((medsa->bytes[3] & 0x06) | \
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((medsa->bytes[4] >> 4) & 0x01))
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#define CODE_BDPU 0
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#define CODE_IGMP_MLD 2
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#define CODE_ARP_MIRROR 4
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#define CFI(medsa) (medsa->bytes[3] & 0x01)
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#define PRI(medsa) (medsa->bytes[4] >> 5)
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#define VID(medsa) (((u_short)(medsa->bytes[4] & 0xf) << 8 | \
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medsa->bytes[5]))
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static const struct tok tag_values[] = {
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{ TAG_TO_CPU, "To_CPU" },
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{ TAG_FROM_CPU, "From_CPU" },
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{ TAG_FORWARD, "Forward" },
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{ 0, NULL },
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};
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static const struct tok code_values[] = {
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{ CODE_BDPU, "BDPU" },
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{ CODE_IGMP_MLD, "IGMP/MLD" },
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{ CODE_ARP_MIRROR, "APR_Mirror" },
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{ 0, NULL },
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};
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static void
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medsa_print_full(netdissect_options *ndo,
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const struct medsa_pkthdr *medsa,
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u_int caplen)
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{
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u_char tag = TAG(medsa);
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ND_PRINT((ndo, "%s",
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tok2str(tag_values, "Unknown (%u)", tag)));
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switch (tag) {
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case TAG_TO_CPU:
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ND_PRINT((ndo, ", %stagged", SRC_TAG(medsa) ? "" : "un"));
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ND_PRINT((ndo, ", dev.port:vlan %d.%d:%d",
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SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa)));
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ND_PRINT((ndo, ", %s",
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tok2str(code_values, "Unknown (%u)", CODE(medsa))));
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if (CFI(medsa))
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ND_PRINT((ndo, ", CFI"));
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ND_PRINT((ndo, ", pri %d: ", PRI(medsa)));
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break;
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case TAG_FROM_CPU:
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ND_PRINT((ndo, ", %stagged", SRC_TAG(medsa) ? "" : "un"));
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ND_PRINT((ndo, ", dev.port:vlan %d.%d:%d",
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SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa)));
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if (CFI(medsa))
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ND_PRINT((ndo, ", CFI"));
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ND_PRINT((ndo, ", pri %d: ", PRI(medsa)));
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break;
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case TAG_FORWARD:
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ND_PRINT((ndo, ", %stagged", SRC_TAG(medsa) ? "" : "un"));
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if (TRUNK(medsa))
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ND_PRINT((ndo, ", dev.trunk:vlan %d.%d:%d",
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SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa)));
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else
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ND_PRINT((ndo, ", dev.port:vlan %d.%d:%d",
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SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa)));
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if (CFI(medsa))
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ND_PRINT((ndo, ", CFI"));
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ND_PRINT((ndo, ", pri %d: ", PRI(medsa)));
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break;
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default:
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ND_DEFAULTPRINT((const u_char *)medsa, caplen);
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return;
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}
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}
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void
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medsa_print(netdissect_options *ndo,
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const u_char *bp, u_int length, u_int caplen)
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{
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register const struct ether_header *ep;
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const struct medsa_pkthdr *medsa;
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u_short ether_type;
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medsa = (const struct medsa_pkthdr *)bp;
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ep = (const struct ether_header *)(bp - sizeof(*ep));
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ND_TCHECK(*medsa);
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if (!ndo->ndo_eflag)
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ND_PRINT((ndo, "MEDSA %d.%d:%d: ",
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SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa)));
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else
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medsa_print_full(ndo, medsa, caplen);
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bp += 8;
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length -= 8;
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caplen -= 8;
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ether_type = EXTRACT_16BITS(&medsa->ether_type);
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if (ether_type <= ETHERMTU) {
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/* Try to print the LLC-layer header & higher layers */
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if (llc_print(ndo, bp, length, caplen, ESRC(ep), EDST(ep)) < 0) {
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/* packet type not known, print raw packet */
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(bp, caplen);
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}
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} else {
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if (ndo->ndo_eflag)
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ND_PRINT((ndo, "ethertype %s (0x%04x) ",
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tok2str(ethertype_values, "Unknown",
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ether_type),
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ether_type));
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if (ethertype_print(ndo, ether_type, bp, length, caplen) == 0) {
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/* ether_type not known, print raw packet */
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if (!ndo->ndo_eflag)
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ND_PRINT((ndo, "ethertype %s (0x%04x) ",
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tok2str(ethertype_values, "Unknown",
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ether_type),
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ether_type));
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(bp, caplen);
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}
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}
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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/*
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* Local Variables:
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* c-style: bsd
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* End:
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*/
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