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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: Stephen Hemminger <shemminger@linux-foundation.org>
This commit is contained in:
Stephen Hemminger 2007-04-09 12:57:54 -07:00 committed by David S. Miller
parent 3f89092318
commit 9cf637473c
4 changed files with 42 additions and 0 deletions
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19
net/bridge/br_fdb.c
View File

@ -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)

1
net/bridge/br_private.h
View File

@ -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);

14
net/bridge/br_sysfs_br.c
View File

@ -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
};

8
net/bridge/br_sysfs_if.c
View File

@ -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
};