1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 *	Linux ethernet bridge
 4 *
 5 *	Authors:
 6 *	Lennert Buytenhek		<buytenh@gnu.org>
 
 
 
 
 
 7 */
 8
 9#ifndef _BR_PRIVATE_STP_H
10#define _BR_PRIVATE_STP_H
11
12#define BPDU_TYPE_CONFIG 0
13#define BPDU_TYPE_TCN 0x80
14
15/* IEEE 802.1D-1998 timer values */
16#define BR_MIN_HELLO_TIME	(1*HZ)
17#define BR_MAX_HELLO_TIME	(10*HZ)
18
19#define BR_MIN_FORWARD_DELAY	(2*HZ)
20#define BR_MAX_FORWARD_DELAY	(30*HZ)
21
22#define BR_MIN_MAX_AGE		(6*HZ)
23#define BR_MAX_MAX_AGE		(40*HZ)
24
25#define BR_MIN_PATH_COST	1
26#define BR_MAX_PATH_COST	65535
27
28struct br_config_bpdu {
29	unsigned int	topology_change:1;
30	unsigned int	topology_change_ack:1;
31	bridge_id	root;
32	int		root_path_cost;
33	bridge_id	bridge_id;
34	port_id		port_id;
35	int		message_age;
36	int		max_age;
37	int		hello_time;
38	int		forward_delay;
39};
40
41/* called under bridge lock */
42static inline int br_is_designated_port(const struct net_bridge_port *p)
43{
44	return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&
45		(p->designated_port == p->port_id);
46}
47
48
49/* br_stp.c */
50void br_become_root_bridge(struct net_bridge *br);
51void br_config_bpdu_generation(struct net_bridge *);
52void br_configuration_update(struct net_bridge *);
53void br_port_state_selection(struct net_bridge *);
54void br_received_config_bpdu(struct net_bridge_port *p,
55			     const struct br_config_bpdu *bpdu);
56void br_received_tcn_bpdu(struct net_bridge_port *p);
57void br_transmit_config(struct net_bridge_port *p);
58void br_transmit_tcn(struct net_bridge *br);
59void br_topology_change_detection(struct net_bridge *br);
60void __br_set_topology_change(struct net_bridge *br, unsigned char val);
61
62/* br_stp_bpdu.c */
63void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *);
64void br_send_tcn_bpdu(struct net_bridge_port *);
65
66#endif

 
 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 */
54void br_become_root_bridge(struct net_bridge *br);
55void br_config_bpdu_generation(struct net_bridge *);
56void br_configuration_update(struct net_bridge *);
57void br_port_state_selection(struct net_bridge *);
58void br_received_config_bpdu(struct net_bridge_port *p,
59			     const struct br_config_bpdu *bpdu);
60void br_received_tcn_bpdu(struct net_bridge_port *p);
61void br_transmit_config(struct net_bridge_port *p);
62void br_transmit_tcn(struct net_bridge *br);
63void br_topology_change_detection(struct net_bridge *br);
 
64
65/* br_stp_bpdu.c */
66void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *);
67void br_send_tcn_bpdu(struct net_bridge_port *);
68
69#endif