Commit 9cf63747 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

bridge: add sysfs hook to flush forwarding table 



The RSTP daemon needs to be able to flush all dynamic forwarding
entries in the case of topology change.

This is a temporary interface. It will change to a netlink interface
before RSTP daemon is officially released.

Signed-off-by: default avatarStephen Hemminger <shemminger@linux-foundation.org>
parent 3f890923

net/bridge/br_fdb.c

+19 −0
Original line number Diff line number Diff line
@@ -135,7 +135,26 @@ void br_fdb_cleanup(unsigned long _data) 
	mod_timer(&br->gc_timer, jiffies + HZ/10);

}



/* Completely flush all dynamic entries in forwarding database.*/

void br_fdb_flush(struct net_bridge *br)

{

	int i;



	spin_lock_bh(&br->hash_lock);

	for (i = 0; i < BR_HASH_SIZE; i++) {

		struct net_bridge_fdb_entry *f;

		struct hlist_node *h, *n;

		hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {

			if (!f->is_static)

				fdb_delete(f);

		}

	}

	spin_unlock_bh(&br->hash_lock);

}



/* Flush all entries refering to a specific port.

 * if do_all is set also flush static entries

 */

void br_fdb_delete_by_port(struct net_bridge *br,

			   const struct net_bridge_port *p,

			   int do_all)

net/bridge/br_private.h

+1 −0
Original line number Diff line number Diff line
@@ -135,6 +135,7 @@ extern int br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 
/* br_fdb.c */

extern void br_fdb_init(void);

extern void br_fdb_fini(void);

extern void br_fdb_flush(struct net_bridge *br);

extern void br_fdb_changeaddr(struct net_bridge_port *p,

			      const unsigned char *newaddr);

extern void br_fdb_cleanup(unsigned long arg);

net/bridge/br_sysfs_br.c

+14 −0
Original line number Diff line number Diff line
@@ -309,6 +309,19 @@ static ssize_t store_group_addr(struct device *d, 
static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,

		   show_group_addr, store_group_addr);



static ssize_t store_flush(struct device *d,

			   struct device_attribute *attr,

			   const char *buf, size_t len)

{

	struct net_bridge *br = to_bridge(d);



	if (!capable(CAP_NET_ADMIN))

		return -EPERM;



	br_fdb_flush(br);

	return len;

}

static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);



static struct attribute *bridge_attrs[] = {

	&dev_attr_forward_delay.attr,
@@ -328,6 +341,7 @@ static struct attribute *bridge_attrs[] = { 
	&dev_attr_topology_change_timer.attr,

	&dev_attr_gc_timer.attr,

	&dev_attr_group_addr.attr,

	&dev_attr_flush.attr,

	NULL

};

net/bridge/br_sysfs_if.c

+8 −0
Original line number Diff line number Diff line
@@ -137,6 +137,13 @@ static ssize_t show_hold_timer(struct net_bridge_port *p, 
}

static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);



static ssize_t store_flush(struct net_bridge_port *p, unsigned long v)

{

	br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry

	return 0;

}

static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);



static struct brport_attribute *brport_attrs[] = {

	&brport_attr_path_cost,

	&brport_attr_priority,
@@ -152,6 +159,7 @@ static struct brport_attribute *brport_attrs[] = { 
	&brport_attr_message_age_timer,

	&brport_attr_forward_delay_timer,

	&brport_attr_hold_timer,

	&brport_attr_flush,

	NULL

};