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

• Lines: 226
• Date: Sun Feb 20 10:41:18 2000
• Orig file: v2.3.46/linux/net/bridge/br_stp_if.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.46/linux/net/bridge/br_stp_if.c linux/net/bridge/br_stp_if.c
@@ -0,0 +1,225 @@
+/*
+ *	Spanning tree protocol; interface code
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_stp_if.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"
+
+__u16 br_make_port_id(struct net_bridge_port *p)
+{
+	return (p->priority << 8) | p->port_no;
+}
+
+/* called under bridge lock */
+void br_init_port(struct net_bridge_port *p)
+{
+	p->port_id = br_make_port_id(p);
+	br_become_designated_port(p);
+	p->state = BR_STATE_BLOCKING;
+	p->topology_change_ack = 0;
+	p->config_pending = 0;
+	br_timer_clear(&p->message_age_timer);
+	br_timer_clear(&p->forward_delay_timer);
+	br_timer_clear(&p->hold_timer);
+}
+
+/* called under bridge lock */
+void br_stp_enable_bridge(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+	struct timer_list *timer = &br->tick;
+
+	init_timer(timer);
+	timer->data = (unsigned long) br;
+	timer->function = br_tick;
+	timer->expires = jiffies + 1;
+	add_timer(timer);
+
+	br_timer_set(&br->hello_timer, jiffies);
+	br_config_bpdu_generation(br);
+
+	p = br->port_list;
+	while (p != NULL) {
+		if (p->dev->flags & IFF_UP)
+			br_stp_enable_port(p);
+
+		p = p->next;
+	}
+
+	br_timer_set(&br->gc_timer, jiffies);
+}
+
+/* called under bridge lock */
+void br_stp_disable_bridge(struct net_bridge *br)
+{
+	struct net_bridge_port *p;
+
+	br->topology_change = 0;
+	br->topology_change_detected = 0;
+	br_timer_clear(&br->hello_timer);
+	br_timer_clear(&br->topology_change_timer);
+	br_timer_clear(&br->tcn_timer);
+	br_timer_clear(&br->gc_timer);
+	br_fdb_cleanup(br);
+
+	p = br->port_list;
+	while (p != NULL) {
+		if (p->state != BR_STATE_DISABLED)
+			br_stp_disable_port(p);
+
+		p = p->next;
+	}
+
+	del_timer(&br->tick);
+}
+
+/* called under bridge lock */
+void br_stp_enable_port(struct net_bridge_port *p)
+{
+	br_init_port(p);
+	br_port_state_selection(p->br);
+}
+
+/* called under bridge lock */
+void br_stp_disable_port(struct net_bridge_port *p)
+{
+	struct net_bridge *br;
+	int wasroot;
+
+	br = p->br;
+	printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
+	       br->name, p->port_no, p->dev->name, "disabled");
+
+	wasroot = br_is_root_bridge(br);
+	br_become_designated_port(p);
+	p->state = BR_STATE_DISABLED;
+	p->topology_change_ack = 0;
+	p->config_pending = 0;
+	br_timer_clear(&p->message_age_timer);
+	br_timer_clear(&p->forward_delay_timer);
+	br_timer_clear(&p->hold_timer);
+	br_configuration_update(br);
+	br_port_state_selection(br);
+
+	if (br_is_root_bridge(br) && !wasroot)
+		br_become_root_bridge(br);
+}
+
+/* called under bridge lock */
+static void br_stp_change_bridge_id(struct net_bridge *br, unsigned char *addr)
+{
+	unsigned char oldaddr[6];
+	struct net_bridge_port *p;
+	int wasroot;
+
+	wasroot = br_is_root_bridge(br);
+
+	memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);
+	memcpy(br->bridge_id.addr, addr, ETH_ALEN);
+	memcpy(br->dev.dev_addr, addr, ETH_ALEN);
+
+	p = br->port_list;
+	while (p != NULL) {
+		if (!memcmp(p->designated_bridge.addr, oldaddr, ETH_ALEN))
+			memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
+
+		if (!memcmp(p->designated_root.addr, oldaddr, ETH_ALEN))
+			memcpy(p->designated_root.addr, addr, ETH_ALEN);
+
+		p = p->next;
+	}
+
+	br_configuration_update(br);
+	br_port_state_selection(br);
+	if (br_is_root_bridge(br) && !wasroot)
+		br_become_root_bridge(br);
+}
+
+static unsigned char br_mac_zero[6] = {0,0,0,0,0,0};
+
+/* called under bridge lock */
+void br_stp_recalculate_bridge_id(struct net_bridge *br)
+{
+	unsigned char *addr;
+	struct net_bridge_port *p;
+
+	addr = br_mac_zero;
+
+	p = br->port_list;
+	while (p != NULL) {
+		if (addr == br_mac_zero ||
+		    memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
+			addr = p->dev->dev_addr;
+
+		p = p->next;
+	}
+
+	if (memcmp(br->bridge_id.addr, addr, ETH_ALEN))
+		br_stp_change_bridge_id(br, addr);
+}
+
+/* called under bridge lock */
+void br_stp_set_bridge_priority(struct net_bridge *br, int newprio)
+{
+	struct net_bridge_port *p;
+	int wasroot;
+
+	wasroot = br_is_root_bridge(br);
+
+	p = br->port_list;
+	while (p != NULL) {
+		if (p->state != BR_STATE_DISABLED &&
+		    br_is_designated_port(p)) {
+			p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF;
+			p->designated_bridge.prio[1] = newprio & 0xFF;
+		}
+
+		p = p->next;
+	}
+
+	br->bridge_id.prio[0] = (newprio >> 8) & 0xFF;
+	br->bridge_id.prio[1] = newprio & 0xFF;
+	br_configuration_update(br);
+	br_port_state_selection(br);
+	if (br_is_root_bridge(br) && !wasroot)
+		br_become_root_bridge(br);
+}
+
+/* called under bridge lock */
+void br_stp_set_port_priority(struct net_bridge_port *p, int newprio)
+{
+	int new_port_id = ((newprio & 0xFF) << 8) | p->port_no;
+
+	if (br_is_designated_port(p))
+		p->designated_port = new_port_id;
+
+	p->port_id = new_port_id;
+	if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) &&
+	    p->port_id < p->designated_port) {
+		br_become_designated_port(p);
+		br_port_state_selection(p->br);
+	}
+}
+
+/* called under bridge lock */
+void br_stp_set_path_cost(struct net_bridge_port *p, int path_cost)
+{
+	p->path_cost = path_cost;
+	br_configuration_update(p->br);
+	br_port_state_selection(p->br);
+}