2 * Spanning tree protocol; timer-related code
3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * $Id: br_stp_timer.c,v 1.3 2000/05/05 02:17:17 davem Exp $
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/smp_lock.h>
19 #include "br_private.h"
20 #include "br_private_stp.h"
22 /* called under bridge lock */
23 static int br_is_designated_for_some_port(const struct net_bridge *br)
25 struct net_bridge_port *p;
27 list_for_each_entry(p, &br->port_list, list) {
28 if (p->state != BR_STATE_DISABLED &&
29 !memcmp(&p->designated_bridge, &br->bridge_id, 8))
36 static void br_hello_timer_expired(unsigned long arg)
38 struct net_bridge *br = (struct net_bridge *)arg;
40 pr_debug("%s: hello timer expired\n", br->dev->name);
41 spin_lock_bh(&br->lock);
42 if (br->dev->flags & IFF_UP) {
43 br_config_bpdu_generation(br);
45 mod_timer(&br->hello_timer, jiffies + br->hello_time);
47 spin_unlock_bh(&br->lock);
50 static void br_message_age_timer_expired(unsigned long arg)
52 struct net_bridge_port *p = (struct net_bridge_port *) arg;
53 struct net_bridge *br = p->br;
54 const bridge_id *id = &p->designated_bridge;
57 if (p->state == BR_STATE_DISABLED)
61 pr_info("%s: neighbor %.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x lost on port %d(%s)\n",
63 id->prio[0], id->prio[1],
64 id->addr[0], id->addr[1], id->addr[2],
65 id->addr[3], id->addr[4], id->addr[5],
66 p->port_no, p->dev->name);
69 * According to the spec, the message age timer cannot be
70 * running when we are the root bridge. So.. this was_root
71 * check is redundant. I'm leaving it in for now, though.
73 spin_lock_bh(&br->lock);
74 if (p->state == BR_STATE_DISABLED)
76 was_root = br_is_root_bridge(br);
78 br_become_designated_port(p);
79 br_configuration_update(br);
80 br_port_state_selection(br);
81 if (br_is_root_bridge(br) && !was_root)
82 br_become_root_bridge(br);
84 spin_unlock_bh(&br->lock);
87 static void br_forward_delay_timer_expired(unsigned long arg)
89 struct net_bridge_port *p = (struct net_bridge_port *) arg;
90 struct net_bridge *br = p->br;
92 pr_debug("%s: %d(%s) forward delay timer\n",
93 br->dev->name, p->port_no, p->dev->name);
94 spin_lock_bh(&br->lock);
95 if (p->state == BR_STATE_LISTENING) {
96 p->state = BR_STATE_LEARNING;
97 mod_timer(&p->forward_delay_timer,
98 jiffies + br->forward_delay);
99 } else if (p->state == BR_STATE_LEARNING) {
100 p->state = BR_STATE_FORWARDING;
101 if (br_is_designated_for_some_port(br))
102 br_topology_change_detection(br);
105 spin_unlock_bh(&br->lock);
108 static void br_tcn_timer_expired(unsigned long arg)
110 struct net_bridge *br = (struct net_bridge *) arg;
112 pr_debug("%s: tcn timer expired\n", br->dev->name);
113 spin_lock_bh(&br->lock);
114 if (br->dev->flags & IFF_UP) {
117 mod_timer(&br->tcn_timer,jiffies + br->bridge_hello_time);
119 spin_unlock_bh(&br->lock);
122 static void br_topology_change_timer_expired(unsigned long arg)
124 struct net_bridge *br = (struct net_bridge *) arg;
126 pr_debug("%s: topo change timer expired\n", br->dev->name);
127 spin_lock_bh(&br->lock);
128 br->topology_change_detected = 0;
129 br->topology_change = 0;
130 spin_unlock_bh(&br->lock);
133 static void br_hold_timer_expired(unsigned long arg)
135 struct net_bridge_port *p = (struct net_bridge_port *) arg;
137 pr_debug("%s: %d(%s) hold timer expired\n",
138 p->br->dev->name, p->port_no, p->dev->name);
140 spin_lock_bh(&p->br->lock);
141 if (p->config_pending)
142 br_transmit_config(p);
143 spin_unlock_bh(&p->br->lock);
146 static inline void br_timer_init(struct timer_list *timer,
147 void (*_function)(unsigned long),
151 timer->function = _function;
155 void br_stp_timer_init(struct net_bridge *br)
157 br_timer_init(&br->hello_timer, br_hello_timer_expired,
160 br_timer_init(&br->tcn_timer, br_tcn_timer_expired,
163 br_timer_init(&br->topology_change_timer,
164 br_topology_change_timer_expired,
167 br_timer_init(&br->gc_timer, br_fdb_cleanup, (unsigned long) br);
170 void br_stp_port_timer_init(struct net_bridge_port *p)
172 br_timer_init(&p->message_age_timer, br_message_age_timer_expired,
175 br_timer_init(&p->forward_delay_timer, br_forward_delay_timer_expired,
178 br_timer_init(&p->hold_timer, br_hold_timer_expired,