1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22/* \summary: Broadcom Ethernet switches tag (4 bytes) printer */
23
24#ifdef HAVE_CONFIG_H
25#include <config.h>
26#endif
27
28#include "netdissect-stdinc.h"
29
30#define ND_LONGJMP_FROM_TCHECK
31#include "netdissect.h"
32#include "ethertype.h"
33#include "addrtoname.h"
34#include "extract.h"
35
36#define ETHER_TYPE_LEN		2
37
38#define BRCM_TAG_LEN		4
39#define BRCM_OPCODE_SHIFT	5
40#define BRCM_OPCODE_MASK	0x7
41
42/* Ingress fields */
43#define BRCM_IG_TC_SHIFT	2
44#define BRCM_IG_TC_MASK		0x7
45#define BRCM_IG_TE_MASK		0x3
46#define BRCM_IG_TS_SHIFT	7
47#define BRCM_IG_DSTMAP_MASK	0x1ff
48
49/* Egress fields */
50#define BRCM_EG_CID_MASK	0xff
51#define BRCM_EG_RC_MASK		0xff
52#define  BRCM_EG_RC_RSVD	(3 << 6)
53#define  BRCM_EG_RC_EXCEPTION	(1 << 5)
54#define  BRCM_EG_RC_PROT_SNOOP	(1 << 4)
55#define  BRCM_EG_RC_PROT_TERM	(1 << 3)
56#define  BRCM_EG_RC_SWITCH	(1 << 2)
57#define  BRCM_EG_RC_MAC_LEARN	(1 << 1)
58#define  BRCM_EG_RC_MIRROR	(1 << 0)
59#define BRCM_EG_TC_SHIFT	5
60#define BRCM_EG_TC_MASK		0x7
61#define BRCM_EG_PID_MASK	0x1f
62
63static const struct tok brcm_tag_te_values[] = {
64	{ 0, "None" },
65	{ 1, "Untag" },
66	{ 2, "Header"},
67	{ 3, "Reserved" },
68	{ 0, NULL }
69};
70
71static const struct tok brcm_tag_rc_values[] = {
72	{ 1, "mirror" },
73	{ 2, "MAC learning" },
74	{ 4, "switching" },
75	{ 8, "prot term" },
76	{ 16, "prot snoop" },
77	{ 32, "exception" },
78	{ 0, NULL }
79};
80
81static void
82brcm_tag_print(netdissect_options *ndo, const u_char *bp)
83{
84	uint8_t tag[BRCM_TAG_LEN];
85	uint16_t dst_map;
86	unsigned int i;
87
88	for (i = 0; i < BRCM_TAG_LEN; i++)
89		tag[i] = GET_U_1(bp + i);
90
91	ND_PRINT("BRCM tag OP: %s", tag[0] ? "IG" : "EG");
92	if (tag[0] & (1 << BRCM_OPCODE_SHIFT)) {
93		/* Ingress Broadcom tag */
94		ND_PRINT(", TC: %d", (tag[1] >> BRCM_IG_TC_SHIFT) &
95			 BRCM_IG_TC_MASK);
96		ND_PRINT(", TE: %s",
97			 tok2str(brcm_tag_te_values, "unknown",
98				 (tag[1] & BRCM_IG_TE_MASK)));
99		ND_PRINT(", TS: %d", tag[1] >> BRCM_IG_TS_SHIFT);
100		dst_map = (uint16_t)tag[2] << 8 | tag[3];
101		ND_PRINT(", DST map: 0x%04x", dst_map & BRCM_IG_DSTMAP_MASK);
102	} else {
103		/* Egress Broadcom tag */
104		ND_PRINT(", CID: %d", tag[1]);
105		ND_PRINT(", RC: %s", tok2str(brcm_tag_rc_values,
106			 "reserved", tag[2]));
107		ND_PRINT(", TC: %d", (tag[3] >> BRCM_EG_TC_SHIFT) &
108			 BRCM_EG_TC_MASK);
109		ND_PRINT(", port: %d", tag[3] & BRCM_EG_PID_MASK);
110	}
111	ND_PRINT(", ");
112}
113
114void
115brcm_tag_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
116		  const u_char *p)
117{
118	u_int caplen = h->caplen;
119	u_int length = h->len;
120
121	ndo->ndo_protocol = "brcm-tag";
122	ndo->ndo_ll_hdr_len +=
123		ether_switch_tag_print(ndo, p, length, caplen,
124				       brcm_tag_print, BRCM_TAG_LEN);
125}
126
127void
128brcm_tag_prepend_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
129			  const u_char *p)
130{
131	u_int caplen = h->caplen;
132	u_int length = h->len;
133
134	ndo->ndo_protocol = "brcm-tag-prepend";
135	ND_TCHECK_LEN(p, BRCM_TAG_LEN);
136	ndo->ndo_ll_hdr_len += BRCM_TAG_LEN;
137
138	if (ndo->ndo_eflag) {
139		/* Print the prepended Broadcom tag. */
140		brcm_tag_print(ndo, p);
141	}
142	p += BRCM_TAG_LEN;
143	length -= BRCM_TAG_LEN;
144	caplen -= BRCM_TAG_LEN;
145
146	/*
147	 * Now print the Ethernet frame following it.
148	 */
149	ndo->ndo_ll_hdr_len +=
150		ether_print(ndo, p, length, caplen, NULL, NULL);
151}
152