usr.sbin/snoop/snoop_bpdu.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ethernet.h>

#include <snoop.h>

struct conf_bpdu {
    uchar_t cb_protid[2];       /* Protocol Identifier */
    uchar_t cb_protvers;        /* Protocol Version Identifier */
    uchar_t cb_type;        /* BPDU Type */
    uchar_t cb_flags;       /* BPDU Flags */
    uchar_t cb_rootid[8];       /* Root Identifier */
    uchar_t cb_rootcost[4];     /* Root Path Cost */
    uchar_t cb_bridgeid[8];     /* Bridge Identifier */
    uchar_t cb_portid[2];       /* Port Identifier */
    uchar_t cb_messageage[2];   /* Message Age */
    uchar_t cb_maxage[2];       /* Max Age */
    uchar_t cb_hello[2];        /* Hello Time */
    uchar_t cb_fwddelay[2];     /* Forward Delay */
};

#define BPDU_TYPE_CONF      0
#define BPDU_TYPE_RCONF     2
#define BPDU_TYPE_TCNOTIF   0x80

int
interpret_bpdu(int flags, char *data, int dlen)
{
    struct conf_bpdu *cb;
    const char *pdutype;

    if (dlen < 4) {
        (void) snprintf(get_sum_line(), MAXLINE,
            "BPDU (short packet)");
        return (0);
    }

    cb = (struct conf_bpdu *)data;

    if (flags & F_SUM) {
        (void) snprintf(get_sum_line(), MAXLINE,
            "Bridge PDU T:%d L:%d", cb->cb_type, dlen);
    }

    if (flags & F_DTAIL) {
        show_header("Bridge-PDU: ",
            "Bridge PDU Frame", dlen);
        show_space();
        switch (cb->cb_type) {
        case BPDU_TYPE_CONF:
            pdutype = "Configuration";
            break;
        case BPDU_TYPE_RCONF:
            pdutype = "Rapid Configuration";
            break;
        case BPDU_TYPE_TCNOTIF:
            pdutype = "TC Notification";
            break;
        default:
            pdutype = "?";
            break;
        }
        (void) snprintf(get_line(0, 0), get_line_remain(),
            "PDU type = %d (%s)", cb->cb_type, pdutype);
        show_trailer();
    }
    return (0);
}