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/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* 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.
*/
/* \summary: Marvell Extended Distributed Switch Architecture (MEDSA) printer */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "ethertype.h"
#include "addrtoname.h"
#include "extract.h"
/*
* Marvell Extended Distributed Switch Archiecture.
*
* A Marvell propriatary header used for passing packets to/from
* specific ports of a switch. There is no open specification of this
* header, but is documented in the Marvell Switch data sheets. For
* background, see:
*
* https://lwn.net/Articles/302333/
*/
struct medsa_pkthdr {
nd_byte reserved[2];
nd_uint8_t tag_flags_dev;
nd_uint8_t port_trunc_codehi_cfi;
nd_uint8_t pri_vidhi_codelo;
nd_uint8_t vidlo;
nd_uint16_t ether_type;
};
/* Bytes 0 and 1 are reserved and should contain 0 */
#define TAG(medsa) (EXTRACT_U_1(medsa->tag_flags_dev) >> 6)
#define TAG_TO_CPU 0
#define TAG_FROM_CPU 1
#define TAG_FORWARD 3
#define SRC_TAG(medsa) ((EXTRACT_U_1(medsa->tag_flags_dev) >> 5) & 0x01)
#define SRC_DEV(medsa) (EXTRACT_U_1(medsa->tag_flags_dev) & 0x1f)
#define SRC_PORT(medsa) ((EXTRACT_U_1(medsa->port_trunc_codehi_cfi) >> 3) & 0x01f)
#define TRUNK(medsa) ((EXTRACT_U_1(medsa->port_trunc_codehi_cfi) >> 2) & 0x01)
#define CODE(medsa) ((EXTRACT_U_1(medsa->port_trunc_codehi_cfi) & 0x06) | \
((EXTRACT_U_1(medsa->pri_vidhi_codelo) >> 4) & 0x01))
#define CODE_BDPU 0
#define CODE_IGMP_MLD 2
#define CODE_ARP_MIRROR 4
#define CFI(medsa) (EXTRACT_U_1(medsa->port_trunc_codehi_cfi) & 0x01)
#define PRI(medsa) (EXTRACT_U_1(medsa->pri_vidhi_codelo) >> 5)
#define VID(medsa) (((u_short)(EXTRACT_U_1(medsa->pri_vidhi_codelo) & 0xf) << 8 | \
EXTRACT_U_1(medsa->vidlo)))
static const struct tok tag_values[] = {
{ TAG_TO_CPU, "To_CPU" },
{ TAG_FROM_CPU, "From_CPU" },
{ TAG_FORWARD, "Forward" },
{ 0, NULL },
};
static const struct tok code_values[] = {
{ CODE_BDPU, "BDPU" },
{ CODE_IGMP_MLD, "IGMP/MLD" },
{ CODE_ARP_MIRROR, "APR_Mirror" },
{ 0, NULL },
};
static void
medsa_print_full(netdissect_options *ndo,
const struct medsa_pkthdr *medsa,
u_int caplen)
{
u_char tag = TAG(medsa);
ND_PRINT("%s",
tok2str(tag_values, "Unknown (%u)", tag));
switch (tag) {
case TAG_TO_CPU:
ND_PRINT(", %stagged", SRC_TAG(medsa) ? "" : "un");
ND_PRINT(", dev.port:vlan %u.%u:%u",
SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa));
ND_PRINT(", %s",
tok2str(code_values, "Unknown (%u)", CODE(medsa)));
if (CFI(medsa))
ND_PRINT(", CFI");
ND_PRINT(", pri %u: ", PRI(medsa));
break;
case TAG_FROM_CPU:
ND_PRINT(", %stagged", SRC_TAG(medsa) ? "" : "un");
ND_PRINT(", dev.port:vlan %u.%u:%u",
SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa));
if (CFI(medsa))
ND_PRINT(", CFI");
ND_PRINT(", pri %u: ", PRI(medsa));
break;
case TAG_FORWARD:
ND_PRINT(", %stagged", SRC_TAG(medsa) ? "" : "un");
if (TRUNK(medsa))
ND_PRINT(", dev.trunk:vlan %u.%u:%u",
SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa));
else
ND_PRINT(", dev.port:vlan %u.%u:%u",
SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa));
if (CFI(medsa))
ND_PRINT(", CFI");
ND_PRINT(", pri %u: ", PRI(medsa));
break;
default:
ND_DEFAULTPRINT((const u_char *)medsa, caplen);
return;
}
}
void
medsa_print(netdissect_options *ndo,
const u_char *bp, u_int length, u_int caplen,
const struct lladdr_info *src, const struct lladdr_info *dst)
{
const struct medsa_pkthdr *medsa;
u_short ether_type;
ndo->ndo_protocol = "medsa";
medsa = (const struct medsa_pkthdr *)bp;
ND_TCHECK_SIZE(medsa);
if (!ndo->ndo_eflag)
ND_PRINT("MEDSA %u.%u:%u: ",
SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa));
else
medsa_print_full(ndo, medsa, caplen);
bp += 8;
length -= 8;
caplen -= 8;
ether_type = EXTRACT_BE_U_2(medsa->ether_type);
if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
/* Try to print the LLC-layer header & higher layers */
if (llc_print(ndo, bp, length, caplen, src, dst) < 0) {
/* packet type not known, print raw packet */
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(bp, caplen);
}
} else {
if (ndo->ndo_eflag)
ND_PRINT("ethertype %s (0x%04x) ",
tok2str(ethertype_values, "Unknown",
ether_type),
ether_type);
if (ethertype_print(ndo, ether_type, bp, length, caplen, src, dst) == 0) {
/* ether_type not known, print raw packet */
if (!ndo->ndo_eflag)
ND_PRINT("ethertype %s (0x%04x) ",
tok2str(ethertype_values, "Unknown",
ether_type),
ether_type);
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(bp, caplen);
}
}
return;
trunc:
nd_print_trunc(ndo);
}
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