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/*
* Spanning tree protocol; timer-related code
* Linux ethernet bridge
*
* Authors:
* Lennert Buytenhek <buytenh@gnu.org>
*
* $Id: br_stp_timer.c,v 1.3 2000/05/05 02:17:17 davem Exp $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/times.h>
#include <linux/smp_lock.h>
#include "br_private.h"
#include "br_private_stp.h"
/* called under bridge lock */
static int br_is_designated_for_some_port(const struct net_bridge *br)
{
struct net_bridge_port *p;
list_for_each_entry(p, &br->port_list, list) {
if (p->state != BR_STATE_DISABLED &&
!memcmp(&p->designated_bridge, &br->bridge_id, 8))
return 1;
}
return 0;
}
static void br_hello_timer_expired(unsigned long arg)
{
struct net_bridge *br = (struct net_bridge *)arg;
pr_debug("%s: hello timer expired\n", br->dev->name);
spin_lock(&br->lock);
if (br->dev->flags & IFF_UP) {
br_config_bpdu_generation(br);
mod_timer(&br->hello_timer, jiffies + br->hello_time);
}
spin_unlock(&br->lock);
}
static void br_message_age_timer_expired(unsigned long arg)
{
struct net_bridge_port *p = (struct net_bridge_port *) arg;
struct net_bridge *br = p->br;
const bridge_id *id = &p->designated_bridge;
int was_root;
if (p->state == BR_STATE_DISABLED)
return;
pr_info("%s: neighbor %.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x lost on port %d(%s)\n",
br->dev->name,
id->prio[0], id->prio[1],
id->addr[0], id->addr[1], id->addr[2],
id->addr[3], id->addr[4], id->addr[5],
p->port_no, p->dev->name);
/*
* According to the spec, the message age timer cannot be
* running when we are the root bridge. So.. this was_root
* check is redundant. I'm leaving it in for now, though.
*/
spin_lock(&br->lock);
if (p->state == BR_STATE_DISABLED)
goto unlock;
was_root = br_is_root_bridge(br);
br_become_designated_port(p);
br_configuration_update(br);
br_port_state_selection(br);
if (br_is_root_bridge(br) && !was_root)
br_become_root_bridge(br);
unlock:
spin_unlock(&br->lock);
}
static void br_forward_delay_timer_expired(unsigned long arg)
{
struct net_bridge_port *p = (struct net_bridge_port *) arg;
struct net_bridge *br = p->br;
pr_debug("%s: %d(%s) forward delay timer\n",
br->dev->name, p->port_no, p->dev->name);
spin_lock(&br->lock);
if (p->state == BR_STATE_LISTENING) {
p->state = BR_STATE_LEARNING;
mod_timer(&p->forward_delay_timer,
jiffies + br->forward_delay);
} else if (p->state == BR_STATE_LEARNING) {
p->state = BR_STATE_FORWARDING;
if (br_is_designated_for_some_port(br))
br_topology_change_detection(br);
}
br_log_state(p);
spin_unlock(&br->lock);
}
static void br_tcn_timer_expired(unsigned long arg)
{
struct net_bridge *br = (struct net_bridge *) arg;
pr_debug("%s: tcn timer expired\n", br->dev->name);
spin_lock(&br->lock);
if (br->dev->flags & IFF_UP) {
br_transmit_tcn(br);
mod_timer(&br->tcn_timer,jiffies + br->bridge_hello_time);
}
spin_unlock(&br->lock);
}
static void br_topology_change_timer_expired(unsigned long arg)
{
struct net_bridge *br = (struct net_bridge *) arg;
pr_debug("%s: topo change timer expired\n", br->dev->name);
spin_lock(&br->lock);
br->topology_change_detected = 0;
br->topology_change = 0;
spin_unlock(&br->lock);
}
static void br_hold_timer_expired(unsigned long arg)
{
struct net_bridge_port *p = (struct net_bridge_port *) arg;
pr_debug("%s: %d(%s) hold timer expired\n",
p->br->dev->name, p->port_no, p->dev->name);
spin_lock(&p->br->lock);
if (p->config_pending)
br_transmit_config(p);
spin_unlock(&p->br->lock);
}
static inline void br_timer_init(struct timer_list *timer,
void (*_function)(unsigned long),
unsigned long _data)
{
init_timer(timer);
timer->function = _function;
timer->data = _data;
}
void br_stp_timer_init(struct net_bridge *br)
{
br_timer_init(&br->hello_timer, br_hello_timer_expired,
(unsigned long) br);
br_timer_init(&br->tcn_timer, br_tcn_timer_expired,
(unsigned long) br);
br_timer_init(&br->topology_change_timer,
br_topology_change_timer_expired,
(unsigned long) br);
br_timer_init(&br->gc_timer, br_fdb_cleanup, (unsigned long) br);
}
void br_stp_port_timer_init(struct net_bridge_port *p)
{
br_timer_init(&p->message_age_timer, br_message_age_timer_expired,
(unsigned long) p);
br_timer_init(&p->forward_delay_timer, br_forward_delay_timer_expired,
(unsigned long) p);
br_timer_init(&p->hold_timer, br_hold_timer_expired,
(unsigned long) p);
}
/* Report ticks left (in USER_HZ) used for API */
unsigned long br_timer_value(const struct timer_list *timer)
{
return timer_pending(timer)
? jiffies_to_clock_t(timer->expires - jiffies) : 0;
}
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