![Vivien Didelot](/assets/img/avatar_default.png)
Add a __br_set_topology_change helper to set the topology change value. This can be later extended to add actions when the topology change flag is set or cleared. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: David S. Miller <davem@davemloft.net>
178 lines
4.6 KiB
C
178 lines
4.6 KiB
C
/*
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* Spanning tree protocol; timer-related code
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* Linux ethernet bridge
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*
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/times.h>
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#include "br_private.h"
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#include "br_private_stp.h"
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/* called under bridge lock */
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static int br_is_designated_for_some_port(const struct net_bridge *br)
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{
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struct net_bridge_port *p;
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list_for_each_entry(p, &br->port_list, list) {
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if (p->state != BR_STATE_DISABLED &&
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!memcmp(&p->designated_bridge, &br->bridge_id, 8))
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return 1;
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}
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return 0;
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}
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static void br_hello_timer_expired(unsigned long arg)
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{
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struct net_bridge *br = (struct net_bridge *)arg;
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br_debug(br, "hello timer expired\n");
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spin_lock(&br->lock);
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if (br->dev->flags & IFF_UP) {
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br_config_bpdu_generation(br);
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if (br->stp_enabled != BR_USER_STP)
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mod_timer(&br->hello_timer,
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round_jiffies(jiffies + br->hello_time));
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}
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spin_unlock(&br->lock);
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}
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static void br_message_age_timer_expired(unsigned long arg)
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{
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struct net_bridge_port *p = (struct net_bridge_port *) arg;
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struct net_bridge *br = p->br;
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const bridge_id *id = &p->designated_bridge;
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int was_root;
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if (p->state == BR_STATE_DISABLED)
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return;
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br_info(br, "port %u(%s) neighbor %.2x%.2x.%pM lost\n",
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(unsigned int) p->port_no, p->dev->name,
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id->prio[0], id->prio[1], &id->addr);
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/*
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* According to the spec, the message age timer cannot be
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* running when we are the root bridge. So.. this was_root
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* check is redundant. I'm leaving it in for now, though.
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*/
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spin_lock(&br->lock);
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if (p->state == BR_STATE_DISABLED)
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goto unlock;
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was_root = br_is_root_bridge(br);
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br_become_designated_port(p);
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br_configuration_update(br);
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br_port_state_selection(br);
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if (br_is_root_bridge(br) && !was_root)
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br_become_root_bridge(br);
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unlock:
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spin_unlock(&br->lock);
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}
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static void br_forward_delay_timer_expired(unsigned long arg)
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{
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struct net_bridge_port *p = (struct net_bridge_port *) arg;
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struct net_bridge *br = p->br;
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br_debug(br, "port %u(%s) forward delay timer\n",
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(unsigned int) p->port_no, p->dev->name);
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spin_lock(&br->lock);
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if (p->state == BR_STATE_LISTENING) {
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br_set_state(p, BR_STATE_LEARNING);
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mod_timer(&p->forward_delay_timer,
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jiffies + br->forward_delay);
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} else if (p->state == BR_STATE_LEARNING) {
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br_set_state(p, BR_STATE_FORWARDING);
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if (br_is_designated_for_some_port(br))
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br_topology_change_detection(br);
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netif_carrier_on(br->dev);
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}
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rcu_read_lock();
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br_ifinfo_notify(RTM_NEWLINK, p);
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rcu_read_unlock();
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spin_unlock(&br->lock);
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}
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static void br_tcn_timer_expired(unsigned long arg)
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{
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struct net_bridge *br = (struct net_bridge *) arg;
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br_debug(br, "tcn timer expired\n");
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spin_lock(&br->lock);
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if (!br_is_root_bridge(br) && (br->dev->flags & IFF_UP)) {
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br_transmit_tcn(br);
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mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time);
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}
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spin_unlock(&br->lock);
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}
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static void br_topology_change_timer_expired(unsigned long arg)
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{
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struct net_bridge *br = (struct net_bridge *) arg;
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br_debug(br, "topo change timer expired\n");
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spin_lock(&br->lock);
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br->topology_change_detected = 0;
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__br_set_topology_change(br, 0);
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spin_unlock(&br->lock);
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}
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static void br_hold_timer_expired(unsigned long arg)
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{
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struct net_bridge_port *p = (struct net_bridge_port *) arg;
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br_debug(p->br, "port %u(%s) hold timer expired\n",
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(unsigned int) p->port_no, p->dev->name);
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spin_lock(&p->br->lock);
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if (p->config_pending)
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br_transmit_config(p);
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spin_unlock(&p->br->lock);
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}
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void br_stp_timer_init(struct net_bridge *br)
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{
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setup_timer(&br->hello_timer, br_hello_timer_expired,
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(unsigned long) br);
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setup_timer(&br->tcn_timer, br_tcn_timer_expired,
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(unsigned long) br);
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setup_timer(&br->topology_change_timer,
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br_topology_change_timer_expired,
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(unsigned long) br);
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setup_timer(&br->gc_timer, br_fdb_cleanup, (unsigned long) br);
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}
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void br_stp_port_timer_init(struct net_bridge_port *p)
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{
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setup_timer(&p->message_age_timer, br_message_age_timer_expired,
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(unsigned long) p);
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setup_timer(&p->forward_delay_timer, br_forward_delay_timer_expired,
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(unsigned long) p);
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setup_timer(&p->hold_timer, br_hold_timer_expired,
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(unsigned long) p);
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}
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/* Report ticks left (in USER_HZ) used for API */
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unsigned long br_timer_value(const struct timer_list *timer)
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{
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return timer_pending(timer)
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? jiffies_delta_to_clock_t(timer->expires - jiffies) : 0;
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}
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