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>
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index dd5a5d5..22645e3 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -135,7 +135,26 @@
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)
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index fab8ce0..3adacdf 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -135,6 +135,7 @@
/* 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);
diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
index 01a22ad..6cc5cfe 100644
--- a/net/bridge/br_sysfs_br.c
+++ b/net/bridge/br_sysfs_br.c
@@ -309,6 +309,19 @@
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 @@
&dev_attr_topology_change_timer.attr,
&dev_attr_gc_timer.attr,
&dev_attr_group_addr.attr,
+ &dev_attr_flush.attr,
NULL
};
diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
index 0bc2aef..2da2292 100644
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -137,6 +137,13 @@
}
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 @@
&brport_attr_message_age_timer,
&brport_attr_forward_delay_timer,
&brport_attr_hold_timer,
+ &brport_attr_flush,
NULL
};