1/*
2 *	Linux ethernet bridge
3 *
4 *	Authors:
5 *	Lennert Buytenhek		<buytenh@gnu.org>
6 *
7 *	This program is free software; you can redistribute it and/or
8 *	modify it under the terms of the GNU General Public License
9 *	as published by the Free Software Foundation; either version
10 *	2 of the License, or (at your option) any later version.
11 */
12
13#ifndef _BR_PRIVATE_STP_H
14#define _BR_PRIVATE_STP_H
15
16#define BPDU_TYPE_CONFIG 0
17#define BPDU_TYPE_TCN 0x80
18
19/* IEEE 802.1D-1998 timer values */
20#define BR_MIN_HELLO_TIME	(1*HZ)
21#define BR_MAX_HELLO_TIME	(10*HZ)
22
23#define BR_MIN_FORWARD_DELAY	(2*HZ)
24#define BR_MAX_FORWARD_DELAY	(30*HZ)
25
26#define BR_MIN_MAX_AGE		(6*HZ)
27#define BR_MAX_MAX_AGE		(40*HZ)
28
29#define BR_MIN_PATH_COST	1
30#define BR_MAX_PATH_COST	65535
31
32struct br_config_bpdu {
33	unsigned int	topology_change:1;
34	unsigned int	topology_change_ack:1;
35	bridge_id	root;
36	int		root_path_cost;
37	bridge_id	bridge_id;
38	port_id		port_id;
39	int		message_age;
40	int		max_age;
41	int		hello_time;
42	int		forward_delay;
43};
44
45/* called under bridge lock */
46static inline int br_is_designated_port(const struct net_bridge_port *p)
47{
48	return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&
49		(p->designated_port == p->port_id);
50}
51
52
53/* br_stp.c */
54extern void br_become_root_bridge(struct net_bridge *br);
55extern void br_config_bpdu_generation(struct net_bridge *);
56extern void br_configuration_update(struct net_bridge *);
57extern void br_port_state_selection(struct net_bridge *);
58extern void br_received_config_bpdu(struct net_bridge_port *p,
59				    const struct br_config_bpdu *bpdu);
60extern void br_received_tcn_bpdu(struct net_bridge_port *p);
61extern void br_transmit_config(struct net_bridge_port *p);
62extern void br_transmit_tcn(struct net_bridge *br);
63extern void br_topology_change_detection(struct net_bridge *br);
64
65/* br_stp_bpdu.c */
66extern void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *);
67extern void br_send_tcn_bpdu(struct net_bridge_port *);
68
69#endif
70