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 53 typedef struct mac_header_t { 54 unsigned char dst_mac[6]; 55 unsigned char src_mac[6]; 56 } MAC_HEADER_T; 57 58 typedef 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 65 typedef struct bpdu_header_t { 66 unsigned char protocol[2]; 67 unsigned char version; 68 unsigned char bpdu_type; 69 } BPDU_HEADER_T; 70 71 typedef 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 83 typedef 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