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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Spanning tree protocol; timer-related code
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Lennert Buytenhek <buytenh@gnu.org>
7 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14#include <linux/kernel.h>
15#include <linux/times.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17#include "br_private.h"
18#include "br_private_stp.h"
19
20/* called under bridge lock */
21static int br_is_designated_for_some_port(const struct net_bridge *br)
22{
23 struct net_bridge_port *p;
24
25 list_for_each_entry(p, &br->port_list, list) {
26 if (p->state != BR_STATE_DISABLED &&
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090027 !memcmp(&p->designated_bridge, &br->bridge_id, 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 return 1;
29 }
30
31 return 0;
32}
33
34static void br_hello_timer_expired(unsigned long arg)
35{
36 struct net_bridge *br = (struct net_bridge *)arg;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090037
stephen hemminger28a16c92010-05-10 09:31:09 +000038 br_debug(br, "hello timer expired\n");
Stephen Hemmingere3efe082006-03-20 22:56:25 -080039 spin_lock(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 if (br->dev->flags & IFF_UP) {
41 br_config_bpdu_generation(br);
42
Stephen Hemminger9a834b82007-05-31 01:21:39 -070043 mod_timer(&br->hello_timer, round_jiffies(jiffies + br->hello_time));
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 }
Stephen Hemmingere3efe082006-03-20 22:56:25 -080045 spin_unlock(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046}
47
48static void br_message_age_timer_expired(unsigned long arg)
49{
50 struct net_bridge_port *p = (struct net_bridge_port *) arg;
51 struct net_bridge *br = p->br;
52 const bridge_id *id = &p->designated_bridge;
53 int was_root;
54
55 if (p->state == BR_STATE_DISABLED)
56 return;
57
stephen hemminger28a16c92010-05-10 09:31:09 +000058 br_info(br, "port %u(%s) neighbor %.2x%.2x.%pM lost\n",
Eric Dumazet95c96172012-04-15 05:58:06 +000059 (unsigned int) p->port_no, p->dev->name,
stephen hemminger28a16c92010-05-10 09:31:09 +000060 id->prio[0], id->prio[1], &id->addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62 /*
63 * According to the spec, the message age timer cannot be
64 * running when we are the root bridge. So.. this was_root
65 * check is redundant. I'm leaving it in for now, though.
66 */
Stephen Hemmingere3efe082006-03-20 22:56:25 -080067 spin_lock(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 if (p->state == BR_STATE_DISABLED)
69 goto unlock;
70 was_root = br_is_root_bridge(br);
71
72 br_become_designated_port(p);
73 br_configuration_update(br);
74 br_port_state_selection(br);
75 if (br_is_root_bridge(br) && !was_root)
76 br_become_root_bridge(br);
77 unlock:
Stephen Hemmingere3efe082006-03-20 22:56:25 -080078 spin_unlock(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079}
80
81static void br_forward_delay_timer_expired(unsigned long arg)
82{
83 struct net_bridge_port *p = (struct net_bridge_port *) arg;
84 struct net_bridge *br = p->br;
85
stephen hemminger28a16c92010-05-10 09:31:09 +000086 br_debug(br, "port %u(%s) forward delay timer\n",
Eric Dumazet95c96172012-04-15 05:58:06 +000087 (unsigned int) p->port_no, p->dev->name);
Stephen Hemmingere3efe082006-03-20 22:56:25 -080088 spin_lock(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 if (p->state == BR_STATE_LISTENING) {
90 p->state = BR_STATE_LEARNING;
91 mod_timer(&p->forward_delay_timer,
92 jiffies + br->forward_delay);
93 } else if (p->state == BR_STATE_LEARNING) {
94 p->state = BR_STATE_FORWARDING;
95 if (br_is_designated_for_some_port(br))
96 br_topology_change_detection(br);
stephen hemminger1faa4352011-03-07 08:34:06 +000097 netif_carrier_on(br->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 }
99 br_log_state(p);
stephen hemminger4ecb9612011-07-22 07:47:09 +0000100 br_ifinfo_notify(RTM_NEWLINK, p);
Stephen Hemmingere3efe082006-03-20 22:56:25 -0800101 spin_unlock(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102}
103
104static void br_tcn_timer_expired(unsigned long arg)
105{
106 struct net_bridge *br = (struct net_bridge *) arg;
107
stephen hemminger28a16c92010-05-10 09:31:09 +0000108 br_debug(br, "tcn timer expired\n");
Stephen Hemmingere3efe082006-03-20 22:56:25 -0800109 spin_lock(&br->lock);
stephen hemminger83401eb2013-05-02 14:23:28 +0000110 if (!br_is_root_bridge(br) && (br->dev->flags & IFF_UP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 br_transmit_tcn(br);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900112
tanxiaojun31a5b832013-12-19 13:28:12 +0800113 mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 }
Stephen Hemmingere3efe082006-03-20 22:56:25 -0800115 spin_unlock(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
118static void br_topology_change_timer_expired(unsigned long arg)
119{
120 struct net_bridge *br = (struct net_bridge *) arg;
121
stephen hemminger28a16c92010-05-10 09:31:09 +0000122 br_debug(br, "topo change timer expired\n");
Stephen Hemmingere3efe082006-03-20 22:56:25 -0800123 spin_lock(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 br->topology_change_detected = 0;
125 br->topology_change = 0;
Stephen Hemmingere3efe082006-03-20 22:56:25 -0800126 spin_unlock(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128
129static void br_hold_timer_expired(unsigned long arg)
130{
131 struct net_bridge_port *p = (struct net_bridge_port *) arg;
132
stephen hemminger28a16c92010-05-10 09:31:09 +0000133 br_debug(p->br, "port %u(%s) hold timer expired\n",
Eric Dumazet95c96172012-04-15 05:58:06 +0000134 (unsigned int) p->port_no, p->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Stephen Hemmingere3efe082006-03-20 22:56:25 -0800136 spin_lock(&p->br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 if (p->config_pending)
138 br_transmit_config(p);
Stephen Hemmingere3efe082006-03-20 22:56:25 -0800139 spin_unlock(&p->br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142void br_stp_timer_init(struct net_bridge *br)
143{
Stephen Hemmingera95fcac2006-03-20 22:56:38 -0800144 setup_timer(&br->hello_timer, br_hello_timer_expired,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 (unsigned long) br);
146
Stephen Hemmingera95fcac2006-03-20 22:56:38 -0800147 setup_timer(&br->tcn_timer, br_tcn_timer_expired,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 (unsigned long) br);
149
Stephen Hemmingera95fcac2006-03-20 22:56:38 -0800150 setup_timer(&br->topology_change_timer,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 br_topology_change_timer_expired,
152 (unsigned long) br);
153
Stephen Hemmingera95fcac2006-03-20 22:56:38 -0800154 setup_timer(&br->gc_timer, br_fdb_cleanup, (unsigned long) br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155}
156
157void br_stp_port_timer_init(struct net_bridge_port *p)
158{
Stephen Hemmingera95fcac2006-03-20 22:56:38 -0800159 setup_timer(&p->message_age_timer, br_message_age_timer_expired,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 (unsigned long) p);
161
Stephen Hemmingera95fcac2006-03-20 22:56:38 -0800162 setup_timer(&p->forward_delay_timer, br_forward_delay_timer_expired,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 (unsigned long) p);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900164
Stephen Hemmingera95fcac2006-03-20 22:56:38 -0800165 setup_timer(&p->hold_timer, br_hold_timer_expired,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 (unsigned long) p);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900167}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169/* Report ticks left (in USER_HZ) used for API */
170unsigned long br_timer_value(const struct timer_list *timer)
171{
172 return timer_pending(timer)
Eric Dumazeta399a802012-08-08 21:13:53 +0000173 ? jiffies_delta_to_clock_t(timer->expires - jiffies) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}