patch-2.3.47 linux/net/bridge/br_stp_timer.c

• Lines: 185
• Date: Sun Feb 20 10:41:18 2000
• Orig file: v2.3.46/linux/net/bridge/br_stp_timer.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.46/linux/net/bridge/br_stp_timer.c linux/net/bridge/br_stp_timer.c
@@ -0,0 +1,184 @@
+/*
+ *	Spanning tree protocol; timer-related code
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_stp_timer.c,v 1.1 2000/02/18 16:47:13 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/if_bridge.h>
+#include <linux/smp_lock.h>
+#include <asm/uaccess.h>
+#include "br_private.h"
+#include "br_private_stp.h"
+
+static void dump_bridge_id(bridge_id *id)
+{
+	printk("%.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", id->prio[0],
+	       id->prio[1], id->addr[0], id->addr[1], id->addr[2], id->addr[3],
+	       id->addr[4], id->addr[5]);
+}
+
+/* called under bridge lock */
+static int br_is_designated_for_some_port(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+
+	p = br->port_list;
+	while (p != NULL) {
+		if (p->state != BR_STATE_DISABLED &&
+		    !memcmp(&p->designated_bridge, &br->bridge_id, 8))
+			return 1;
+
+		p = p->next;
+	}
+
+	return 0;
+}
+
+/* called under bridge lock */
+static void br_hello_timer_expired(struct net_bridge *br)
+{
+	br_config_bpdu_generation(br);
+	br_timer_set(&br->hello_timer, jiffies);
+}
+
+/* called under bridge lock */
+static void br_message_age_timer_expired(struct net_bridge_port *p)
+{
+	struct net_bridge *br;
+	int was_root;
+
+	br = p->br;
+	printk(KERN_INFO "%s: ", br->name);
+	printk("neighbour ");
+	dump_bridge_id(&p->designated_bridge);
+	printk(" lost on port %i(%s)\n", 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.
+	 */
+	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);
+}
+
+/* called under bridge lock */
+static void br_forward_delay_timer_expired(struct net_bridge_port *p)
+{
+	if (p->state == BR_STATE_LISTENING) {
+		printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
+		       p->br->name, p->port_no, p->dev->name, "learning");
+
+		p->state = BR_STATE_LEARNING;
+		br_timer_set(&p->forward_delay_timer, jiffies);
+	} else if (p->state == BR_STATE_LEARNING) {
+		printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
+		       p->br->name, p->port_no, p->dev->name, "forwarding");
+
+		p->state = BR_STATE_FORWARDING;
+		if (br_is_designated_for_some_port(p->br))
+			br_topology_change_detection(p->br);
+	}
+}
+
+/* called under bridge lock */
+static void br_tcn_timer_expired(struct net_bridge *br)
+{
+	printk(KERN_INFO "%s: retransmitting tcn bpdu\n", br->name);
+	br_transmit_tcn(br);
+	br_timer_set(&br->tcn_timer, jiffies);
+}
+
+/* called under bridge lock */
+static void br_topology_change_timer_expired(struct net_bridge *br)
+{
+	br->topology_change_detected = 0;
+	br->topology_change = 0;
+}
+
+/* called under bridge lock */
+static void br_hold_timer_expired(struct net_bridge_port *p)
+{
+	if (p->config_pending)
+		br_transmit_config(p);
+}
+
+/* called under bridge lock */
+static void br_check_port_timers(struct net_bridge_port *p)
+{
+	if (br_timer_has_expired(&p->message_age_timer, p->br->max_age)) {
+		br_timer_clear(&p->message_age_timer);
+		br_message_age_timer_expired(p);
+	}
+
+	if (br_timer_has_expired(&p->forward_delay_timer, p->br->forward_delay)) {
+		br_timer_clear(&p->forward_delay_timer);
+		br_forward_delay_timer_expired(p);
+	}
+
+	if (br_timer_has_expired(&p->hold_timer, BR_HOLD_TIME)) {
+		br_timer_clear(&p->hold_timer);
+		br_hold_timer_expired(p);
+	}
+}
+
+/* called under bridge lock */
+static void br_check_timers(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+
+	if (br_timer_has_expired(&br->gc_timer, br->gc_interval)) {
+		br_timer_set(&br->gc_timer, jiffies);
+		br_fdb_cleanup(br);
+	}
+
+	if (br_timer_has_expired(&br->hello_timer, br->hello_time)) {
+		br_timer_clear(&br->hello_timer);
+		br_hello_timer_expired(br);
+	}
+
+	if (br_timer_has_expired(&br->tcn_timer, br->bridge_hello_time)) {
+		br_timer_clear(&br->tcn_timer);
+		br_tcn_timer_expired(br);
+	}
+
+	if (br_timer_has_expired(&br->topology_change_timer, br->bridge_forward_delay + br->bridge_max_age)) {
+		br_timer_clear(&br->topology_change_timer);
+		br_topology_change_timer_expired(br);
+	}
+
+	p = br->port_list;
+	while (p != NULL) {
+		if (p->state != BR_STATE_DISABLED)
+			br_check_port_timers(p);
+
+		p = p->next;
+	}
+}
+
+void br_tick(unsigned long __data)
+{
+	struct net_bridge *br = (struct net_bridge *)__data;
+
+	read_lock(&br->lock);
+	br_check_timers(br);
+	read_unlock(&br->lock);
+
+	br->tick.expires = jiffies + 1;
+	add_timer(&br->tick);
+}