/*
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/*
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* Spanning tree protocol; timer-related code
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* Spanning tree protocol; timer-related code
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* Linux ethernet bridge
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* Linux ethernet bridge
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*
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*
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* Authors:
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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* Lennert Buytenhek <buytenh@gnu.org>
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*
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*
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* $Id: br_stp_timer.c,v 1.1.1.1 2004-04-15 01:16:26 phoenix Exp $
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* $Id: br_stp_timer.c,v 1.1.1.1 2004-04-15 01:16:26 phoenix Exp $
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*
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*
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* This program is free software; you can redistribute it and/or
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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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* 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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* 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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* 2 of the License, or (at your option) any later version.
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*/
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*/
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/if_bridge.h>
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#include <linux/if_bridge.h>
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#include <linux/smp_lock.h>
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#include <linux/smp_lock.h>
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#include <asm/uaccess.h>
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#include <asm/uaccess.h>
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#include "br_private.h"
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#include "br_private.h"
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#include "br_private_stp.h"
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#include "br_private_stp.h"
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static void dump_bridge_id(bridge_id *id)
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static void dump_bridge_id(bridge_id *id)
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{
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{
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printk("%.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", id->prio[0],
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printk("%.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", id->prio[0],
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id->prio[1], id->addr[0], id->addr[1], id->addr[2], id->addr[3],
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id->prio[1], id->addr[0], id->addr[1], id->addr[2], id->addr[3],
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id->addr[4], id->addr[5]);
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id->addr[4], id->addr[5]);
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}
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}
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/* called under bridge lock */
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/* called under bridge lock */
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static int br_is_designated_for_some_port(struct net_bridge *br)
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static int br_is_designated_for_some_port(struct net_bridge *br)
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{
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{
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struct net_bridge_port *p;
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struct net_bridge_port *p;
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p = br->port_list;
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p = br->port_list;
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while (p != NULL) {
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while (p != NULL) {
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if (p->state != BR_STATE_DISABLED &&
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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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!memcmp(&p->designated_bridge, &br->bridge_id, 8))
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return 1;
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return 1;
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p = p->next;
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p = p->next;
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}
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}
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return 0;
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return 0;
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}
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}
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/* called under bridge lock */
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/* called under bridge lock */
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static void br_hello_timer_expired(struct net_bridge *br)
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static void br_hello_timer_expired(struct net_bridge *br)
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{
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{
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br_config_bpdu_generation(br);
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br_config_bpdu_generation(br);
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br_timer_set(&br->hello_timer, jiffies);
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br_timer_set(&br->hello_timer, jiffies);
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}
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}
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/* called under bridge lock */
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/* called under bridge lock */
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static void br_message_age_timer_expired(struct net_bridge_port *p)
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static void br_message_age_timer_expired(struct net_bridge_port *p)
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{
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{
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struct net_bridge *br;
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struct net_bridge *br;
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int was_root;
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int was_root;
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br = p->br;
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br = p->br;
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printk(KERN_INFO "%s: ", br->dev.name);
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printk(KERN_INFO "%s: ", br->dev.name);
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printk("neighbour ");
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printk("neighbour ");
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dump_bridge_id(&p->designated_bridge);
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dump_bridge_id(&p->designated_bridge);
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printk(" lost on port %i(%s)\n", p->port_no, p->dev->name);
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printk(" lost on port %i(%s)\n", p->port_no, p->dev->name);
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/*
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/*
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* According to the spec, the message age timer cannot be
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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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* 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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* check is redundant. I'm leaving it in for now, though.
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*/
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*/
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was_root = br_is_root_bridge(br);
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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_become_designated_port(p);
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br_configuration_update(br);
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br_configuration_update(br);
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br_port_state_selection(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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if (br_is_root_bridge(br) && !was_root)
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br_become_root_bridge(br);
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br_become_root_bridge(br);
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}
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}
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/* called under bridge lock */
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/* called under bridge lock */
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static void br_forward_delay_timer_expired(struct net_bridge_port *p)
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static void br_forward_delay_timer_expired(struct net_bridge_port *p)
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{
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{
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if (p->state == BR_STATE_LISTENING) {
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if (p->state == BR_STATE_LISTENING) {
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printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
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printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
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p->br->dev.name, p->port_no, p->dev->name, "learning");
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p->br->dev.name, p->port_no, p->dev->name, "learning");
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p->state = BR_STATE_LEARNING;
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p->state = BR_STATE_LEARNING;
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br_timer_set(&p->forward_delay_timer, jiffies);
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br_timer_set(&p->forward_delay_timer, jiffies);
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} else if (p->state == BR_STATE_LEARNING) {
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} else if (p->state == BR_STATE_LEARNING) {
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printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
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printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
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p->br->dev.name, p->port_no, p->dev->name, "forwarding");
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p->br->dev.name, p->port_no, p->dev->name, "forwarding");
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p->state = BR_STATE_FORWARDING;
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p->state = BR_STATE_FORWARDING;
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if (br_is_designated_for_some_port(p->br))
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if (br_is_designated_for_some_port(p->br))
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br_topology_change_detection(p->br);
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br_topology_change_detection(p->br);
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}
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}
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}
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}
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/* called under bridge lock */
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/* called under bridge lock */
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static void br_tcn_timer_expired(struct net_bridge *br)
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static void br_tcn_timer_expired(struct net_bridge *br)
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{
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{
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printk(KERN_INFO "%s: retransmitting tcn bpdu\n", br->dev.name);
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printk(KERN_INFO "%s: retransmitting tcn bpdu\n", br->dev.name);
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br_transmit_tcn(br);
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br_transmit_tcn(br);
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br_timer_set(&br->tcn_timer, jiffies);
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br_timer_set(&br->tcn_timer, jiffies);
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}
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}
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/* called under bridge lock */
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/* called under bridge lock */
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static void br_topology_change_timer_expired(struct net_bridge *br)
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static void br_topology_change_timer_expired(struct net_bridge *br)
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{
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{
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br->topology_change_detected = 0;
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br->topology_change_detected = 0;
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br->topology_change = 0;
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br->topology_change = 0;
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}
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}
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/* called under bridge lock */
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/* called under bridge lock */
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static void br_hold_timer_expired(struct net_bridge_port *p)
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static void br_hold_timer_expired(struct net_bridge_port *p)
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{
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{
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if (p->config_pending)
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if (p->config_pending)
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br_transmit_config(p);
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br_transmit_config(p);
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}
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}
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/* called under bridge lock */
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/* called under bridge lock */
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static void br_check_port_timers(struct net_bridge_port *p)
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static void br_check_port_timers(struct net_bridge_port *p)
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{
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{
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if (br_timer_has_expired(&p->message_age_timer, p->br->max_age)) {
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if (br_timer_has_expired(&p->message_age_timer, p->br->max_age)) {
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br_timer_clear(&p->message_age_timer);
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br_timer_clear(&p->message_age_timer);
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br_message_age_timer_expired(p);
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br_message_age_timer_expired(p);
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}
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}
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if (br_timer_has_expired(&p->forward_delay_timer, p->br->forward_delay)) {
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if (br_timer_has_expired(&p->forward_delay_timer, p->br->forward_delay)) {
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br_timer_clear(&p->forward_delay_timer);
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br_timer_clear(&p->forward_delay_timer);
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br_forward_delay_timer_expired(p);
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br_forward_delay_timer_expired(p);
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}
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}
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if (br_timer_has_expired(&p->hold_timer, BR_HOLD_TIME)) {
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if (br_timer_has_expired(&p->hold_timer, BR_HOLD_TIME)) {
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br_timer_clear(&p->hold_timer);
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br_timer_clear(&p->hold_timer);
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br_hold_timer_expired(p);
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br_hold_timer_expired(p);
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}
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}
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}
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}
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/* called under bridge lock */
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/* called under bridge lock */
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static void br_check_timers(struct net_bridge *br)
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static void br_check_timers(struct net_bridge *br)
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{
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{
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struct net_bridge_port *p;
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struct net_bridge_port *p;
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if (br_timer_has_expired(&br->gc_timer, br->gc_interval)) {
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if (br_timer_has_expired(&br->gc_timer, br->gc_interval)) {
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br_timer_set(&br->gc_timer, jiffies);
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br_timer_set(&br->gc_timer, jiffies);
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br_fdb_cleanup(br);
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br_fdb_cleanup(br);
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}
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}
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if (br_timer_has_expired(&br->hello_timer, br->hello_time)) {
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if (br_timer_has_expired(&br->hello_timer, br->hello_time)) {
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br_timer_clear(&br->hello_timer);
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br_timer_clear(&br->hello_timer);
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br_hello_timer_expired(br);
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br_hello_timer_expired(br);
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}
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}
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if (br_timer_has_expired(&br->tcn_timer, br->bridge_hello_time)) {
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if (br_timer_has_expired(&br->tcn_timer, br->bridge_hello_time)) {
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br_timer_clear(&br->tcn_timer);
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br_timer_clear(&br->tcn_timer);
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br_tcn_timer_expired(br);
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br_tcn_timer_expired(br);
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}
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}
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if (br_timer_has_expired(&br->topology_change_timer, br->bridge_forward_delay + br->bridge_max_age)) {
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if (br_timer_has_expired(&br->topology_change_timer, br->bridge_forward_delay + br->bridge_max_age)) {
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br_timer_clear(&br->topology_change_timer);
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br_timer_clear(&br->topology_change_timer);
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br_topology_change_timer_expired(br);
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br_topology_change_timer_expired(br);
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}
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}
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p = br->port_list;
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p = br->port_list;
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while (p != NULL) {
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while (p != NULL) {
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if (p->state != BR_STATE_DISABLED)
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if (p->state != BR_STATE_DISABLED)
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br_check_port_timers(p);
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br_check_port_timers(p);
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p = p->next;
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p = p->next;
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}
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}
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}
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}
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void br_tick(unsigned long __data)
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void br_tick(unsigned long __data)
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{
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{
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struct net_bridge *br = (struct net_bridge *)__data;
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struct net_bridge *br = (struct net_bridge *)__data;
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read_lock(&br->lock);
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read_lock(&br->lock);
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br_check_timers(br);
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br_check_timers(br);
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read_unlock(&br->lock);
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read_unlock(&br->lock);
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br->tick.expires = jiffies + 1;
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br->tick.expires = jiffies + 1;
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add_timer(&br->tick);
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add_timer(&br->tick);
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}
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}
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