1/*
2 * Copyright (c) 1990, 1991, 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 LI 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 "addrtoname.h"
33#include "extract.h"
34
35#define BCM_LI_SHIM_LEN	4
36
37static const struct tok bcm_li_direction_values[] = {
38    { 1, "unused" },
39    { 2, "egress" },
40    { 3, "ingress" },
41    { 0, NULL}
42};
43
44#define BCM_LI_PKT_TYPE_UNDECIDED 4
45#define BCM_LI_PKT_TYPE_IPV4      5
46#define BCM_LI_PKT_TYPE_IPV6      6
47#define BCM_LI_PKT_TYPE_ETHERNET  7
48
49static const struct tok bcm_li_pkt_type_values[] = {
50    { BCM_LI_PKT_TYPE_UNDECIDED, "undecided" },
51    { BCM_LI_PKT_TYPE_IPV4, "ipv4" },
52    { BCM_LI_PKT_TYPE_IPV6, "ipv6" },
53    { BCM_LI_PKT_TYPE_ETHERNET, "ethernet" },
54    { 0, NULL}
55};
56
57static const struct tok bcm_li_pkt_subtype_values[] = {
58    { 1, "single VLAN tag" },
59    { 2, "double VLAN tag" },
60    { 3, "untagged" },
61    { 0, NULL}
62};
63
64void
65bcm_li_print(netdissect_options *ndo,
66             const u_char *bp, u_int length)
67{
68	u_int shim, direction, pkt_type, pkt_subtype, li_id;
69
70	ndo->ndo_protocol = "bcm_li";
71	if (length < BCM_LI_SHIM_LEN) {
72	    ND_PRINT(" (length %u < %u)", length, BCM_LI_SHIM_LEN);
73	    goto invalid;
74	}
75	shim = GET_BE_U_4(bp);
76
77	direction = (shim >> 29) & 0x7;
78	pkt_type = (shim >> 25) & 0xf;
79	pkt_subtype = (shim >> 22) & 0x7;
80	li_id = shim & 0x3fffff;
81
82	length -= BCM_LI_SHIM_LEN;
83	bp += BCM_LI_SHIM_LEN;
84
85	ND_PRINT("%sBCM-LI-SHIM: direction %s, pkt-type %s, pkt-subtype %s, li-id %u%s",
86		 ndo->ndo_vflag ? "\n    " : "",
87		 tok2str(bcm_li_direction_values, "unknown", direction),
88		 tok2str(bcm_li_pkt_type_values, "unknown", pkt_type),
89		 tok2str(bcm_li_pkt_subtype_values, "unknown", pkt_subtype),
90		 li_id,
91		 ndo->ndo_vflag ? "\n    ": "");
92
93	if (!ndo->ndo_vflag) {
94	    ND_TCHECK_LEN(bp, length);
95	    return;
96	}
97
98	switch (pkt_type) {
99	case BCM_LI_PKT_TYPE_ETHERNET:
100	    ether_print(ndo, bp, length, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
101	    break;
102	case BCM_LI_PKT_TYPE_IPV4:
103	    ip_print(ndo, bp, length);
104	    break;
105	case BCM_LI_PKT_TYPE_IPV6:
106	    ip6_print(ndo, bp, length);
107	    break;
108	case BCM_LI_PKT_TYPE_UNDECIDED:
109
110	    /*
111	     * Guess IP version from first nibble.
112	     */
113	    if ((GET_U_1(bp) >> 4) == 4) {
114		ip_print(ndo, bp, length);
115	    } else if ((GET_U_1(bp) >> 4) == 6) {
116		ip6_print(ndo, bp, length);
117	    } else {
118		ND_PRINT("unknown payload");
119	    }
120	    break;
121
122	default:
123	    goto invalid;
124	}
125
126	return;
127invalid:
128	nd_print_invalid(ndo);
129}
130
131