snoop_bpdu.c revision 10491:8893b747ecdf 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#include <stdio.h>
28#include <sys/types.h>
29#include <sys/socket.h>
30#include <sys/ethernet.h>
31
32#include <snoop.h>
33
34struct conf_bpdu {
35	uchar_t cb_protid[2];		/* Protocol Identifier */
36	uchar_t cb_protvers;		/* Protocol Version Identifier */
37	uchar_t cb_type;		/* BPDU Type */
38	uchar_t cb_flags;		/* BPDU Flags */
39	uchar_t cb_rootid[8];		/* Root Identifier */
40	uchar_t cb_rootcost[4];		/* Root Path Cost */
41	uchar_t cb_bridgeid[8];		/* Bridge Identifier */
42	uchar_t cb_portid[2];		/* Port Identifier */
43	uchar_t cb_messageage[2];	/* Message Age */
44	uchar_t cb_maxage[2];		/* Max Age */
45	uchar_t cb_hello[2];		/* Hello Time */
46	uchar_t cb_fwddelay[2];		/* Forward Delay */
47};
48
49#define	BPDU_TYPE_CONF		0
50#define	BPDU_TYPE_RCONF		2
51#define	BPDU_TYPE_TCNOTIF	0x80
52
53int
54interpret_bpdu(int flags, char *data, int dlen)
55{
56	struct conf_bpdu *cb;
57	const char *pdutype;
58
59	if (dlen < 4) {
60		(void) snprintf(get_sum_line(), MAXLINE,
61		    "BPDU (short packet)");
62		return (0);
63	}
64
65	cb = (struct conf_bpdu *)data;
66
67	if (flags & F_SUM) {
68		(void) snprintf(get_sum_line(), MAXLINE,
69		    "Bridge PDU T:%d L:%d", cb->cb_type, dlen);
70	}
71
72	if (flags & F_DTAIL) {
73		show_header("Bridge-PDU: ",
74		    "Bridge PDU Frame", dlen);
75		show_space();
76		switch (cb->cb_type) {
77		case BPDU_TYPE_CONF:
78			pdutype = "Configuration";
79			break;
80		case BPDU_TYPE_RCONF:
81			pdutype = "Rapid Configuration";
82			break;
83		case BPDU_TYPE_TCNOTIF:
84			pdutype = "TC Notification";
85			break;
86		default:
87			pdutype = "?";
88			break;
89		}
90		(void) snprintf(get_line(0, 0), get_line_remain(),
91		    "PDU type = %d (%s)", cb->cb_type, pdutype);
92		show_trailer();
93	}
94	return (0);
95}
96