2 * Spanning tree protocol; timer-related code
3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * 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.
14 #include <linux/kernel.h>
15 #include <linux/times.h>
17 #include "br_private.h"
18 #include "br_private_stp.h"
20 /* called under bridge lock */
21 static int br_is_designated_for_some_port(const struct net_bridge *br)
23 struct net_bridge_port *p;
25 list_for_each_entry(p, &br->port_list, list) {
26 if (p->state != BR_STATE_DISABLED &&
27 !memcmp(&p->designated_bridge, &br->bridge_id, 8))
34 static void br_hello_timer_expired(unsigned long arg)
36 struct net_bridge *br = (struct net_bridge *)arg;
38 pr_debug("%s: hello timer expired\n", br->dev->name);
40 if (br->dev->flags & IFF_UP) {
41 br_config_bpdu_generation(br);
43 mod_timer(&br->hello_timer, round_jiffies(jiffies + br->hello_time));
45 spin_unlock(&br->lock);
48 static void br_message_age_timer_expired(unsigned long arg)
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;
55 if (p->state == BR_STATE_DISABLED)
59 pr_info("%s: neighbor %.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x lost on port %d(%s)\n",
61 id->prio[0], id->prio[1],
62 id->addr[0], id->addr[1], id->addr[2],
63 id->addr[3], id->addr[4], id->addr[5],
64 p->port_no, p->dev->name);
67 * According to the spec, the message age timer cannot be
68 * running when we are the root bridge. So.. this was_root
69 * check is redundant. I'm leaving it in for now, though.
72 if (p->state == BR_STATE_DISABLED)
74 was_root = br_is_root_bridge(br);
76 br_become_designated_port(p);
77 br_configuration_update(br);
78 br_port_state_selection(br);
79 if (br_is_root_bridge(br) && !was_root)
80 br_become_root_bridge(br);
82 spin_unlock(&br->lock);
85 static void br_forward_delay_timer_expired(unsigned long arg)
87 struct net_bridge_port *p = (struct net_bridge_port *) arg;
88 struct net_bridge *br = p->br;
90 pr_debug("%s: %d(%s) forward delay timer\n",
91 br->dev->name, p->port_no, p->dev->name);
93 if (p->state == BR_STATE_LISTENING) {
94 p->state = BR_STATE_LEARNING;
95 mod_timer(&p->forward_delay_timer,
96 jiffies + br->forward_delay);
97 } else if (p->state == BR_STATE_LEARNING) {
98 p->state = BR_STATE_FORWARDING;
99 if (br_is_designated_for_some_port(br))
100 br_topology_change_detection(br);
103 spin_unlock(&br->lock);
106 static void br_tcn_timer_expired(unsigned long arg)
108 struct net_bridge *br = (struct net_bridge *) arg;
110 pr_debug("%s: tcn timer expired\n", br->dev->name);
111 spin_lock(&br->lock);
112 if (br->dev->flags & IFF_UP) {
115 mod_timer(&br->tcn_timer,jiffies + br->bridge_hello_time);
117 spin_unlock(&br->lock);
120 static void br_topology_change_timer_expired(unsigned long arg)
122 struct net_bridge *br = (struct net_bridge *) arg;
124 pr_debug("%s: topo change timer expired\n", br->dev->name);
125 spin_lock(&br->lock);
126 br->topology_change_detected = 0;
127 br->topology_change = 0;
128 spin_unlock(&br->lock);
131 static void br_hold_timer_expired(unsigned long arg)
133 struct net_bridge_port *p = (struct net_bridge_port *) arg;
135 pr_debug("%s: %d(%s) hold timer expired\n",
136 p->br->dev->name, p->port_no, p->dev->name);
138 spin_lock(&p->br->lock);
139 if (p->config_pending)
140 br_transmit_config(p);
141 spin_unlock(&p->br->lock);
144 void br_stp_timer_init(struct net_bridge *br)
146 setup_timer(&br->hello_timer, br_hello_timer_expired,
149 setup_timer(&br->tcn_timer, br_tcn_timer_expired,
152 setup_timer(&br->topology_change_timer,
153 br_topology_change_timer_expired,
156 setup_timer(&br->gc_timer, br_fdb_cleanup, (unsigned long) br);
159 void br_stp_port_timer_init(struct net_bridge_port *p)
161 setup_timer(&p->message_age_timer, br_message_age_timer_expired,
164 setup_timer(&p->forward_delay_timer, br_forward_delay_timer_expired,
167 setup_timer(&p->hold_timer, br_hold_timer_expired,
171 /* Report ticks left (in USER_HZ) used for API */
172 unsigned long br_timer_value(const struct timer_list *timer)
174 return timer_pending(timer)
175 ? jiffies_to_clock_t(timer->expires - jiffies) : 0;