usr/src/cmd/cmd-inet/usr.sbin/snoop/snoop_bpdu.c

   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
  34 struct 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
  53 int
  54 interpret_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 }