1/************************************************************************
2 * RSTP library - Rapid Spanning Tree (802.1t, 802.1w)
3 * Copyright (C) 2001-2003 Optical Access
4 * Author: Alex Rozin
5 *
6 * This file is part of RSTP library.
7 *
8 * RSTP library is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License as published by the
10 * Free Software Foundation; version 2.1
11 *
12 * RSTP library is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with RSTP library; see the file COPYING.  If not, write to the Free
19 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20 * 02111-1307, USA.
21 **********************************************************************/
22
23/* BPDU formats: 9.1 - 9.3, 17.28 */
24
25#ifndef _STP_BPDU_H__
26#define _STP_BPDU_H__
27
28#define MIN_BPDU                7
29#define BPDU_L_SAP              0x42
30#define LLC_UI                  0x03
31#define BPDU_PROTOCOL_ID        0x0000
32#define BPDU_VERSION_ID         0x00
33#define BPDU_VERSION_RAPID_ID   0x02
34
35#define BPDU_TOPO_CHANGE_TYPE   0x80
36#define BPDU_CONFIG_TYPE        0x00
37#define BPDU_RSTP               0x02
38
39#define TOPOLOGY_CHANGE_BIT     0x01
40#define PROPOSAL_BIT            0x02
41#define PORT_ROLE_OFFS          2   /* 0x04 & 0x08 */
42#define PORT_ROLE_MASK          (0x03 << PORT_ROLE_OFFS)
43#define LEARN_BIT               0x10
44#define FORWARD_BIT             0x20
45#define AGREEMENT_BIT           0x40
46#define TOPOLOGY_CHANGE_ACK_BIT 0x80
47
48#define RSTP_PORT_ROLE_UNKN     0x00
49#define RSTP_PORT_ROLE_ALTBACK  0x01
50#define RSTP_PORT_ROLE_ROOT     0x02
51#define RSTP_PORT_ROLE_DESGN    0x03
52
53typedef struct mac_header_t {
54  unsigned char dst_mac[6];
55  unsigned char src_mac[6];
56} MAC_HEADER_T;
57
58typedef struct eth_header_t {
59  unsigned char len8023[2];
60  unsigned char dsap;
61  unsigned char ssap;
62  unsigned char llc;
63} ETH_HEADER_T;
64
65typedef struct bpdu_header_t {
66  unsigned char protocol[2];
67  unsigned char version;
68  unsigned char bpdu_type;
69} BPDU_HEADER_T;
70
71typedef struct bpdu_body_t {
72  unsigned char flags;
73  unsigned char root_id[8];
74  unsigned char root_path_cost[4];
75  unsigned char bridge_id[8];
76  unsigned char port_id[2];
77  unsigned char message_age[2];
78  unsigned char max_age[2];
79  unsigned char hello_time[2];
80  unsigned char forward_delay[2];
81} BPDU_BODY_T;
82
83typedef struct stp_bpdu_t {
84  ETH_HEADER_T  eth;
85  BPDU_HEADER_T hdr;
86  BPDU_BODY_T   body;
87  unsigned char ver_1_len[2];
88} BPDU_T;
89
90#endif /* _STP_BPDU_H__ */
91