Add a flush attribute to sysfs to allow flushing forwarding table.
This can be used by user level spanning tree protocol to clear state.
---
net/bridge/br_fdb.c | 11 ++++++++---
net/bridge/br_sysfs_br.c | 14 ++++++++++++++
net/bridge/br_sysfs_if.c | 8 ++++++++
3 files changed, 30 insertions(+), 3 deletions(-)
--- bridge.orig/net/bridge/br_sysfs_br.c 2007-02-21 14:28:49.000000000 -0800
+++ bridge/net/bridge/br_sysfs_br.c 2007-02-21 14:39:50.000000000 -0800
@@ -310,6 +310,19 @@
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_delete_by_port(br, NULL, 0);
+ return len;
+}
+static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);
+
static struct attribute *bridge_attrs[] = {
&dev_attr_forward_delay.attr,
&dev_attr_hello_time.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
};
--- bridge.orig/net/bridge/br_sysfs_if.c 2007-02-21 14:29:25.000000000 -0800
+++ bridge/net/bridge/br_sysfs_if.c 2007-02-21 14:29:27.000000000 -0800
@@ -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
};
--- bridge.orig/net/bridge/br_fdb.c 2007-02-21 14:28:49.000000000 -0800
+++ bridge/net/bridge/br_fdb.c 2007-02-21 14:29:27.000000000 -0800
@@ -128,7 +128,11 @@
mod_timer(&br->gc_timer, jiffies + HZ/10);
}
-
+/*
+ * Flush all forwarding entries for a port.
+ * if p is NULL, it means flush for all ports.
+ * if do_all is non-zero, then flush static entries as well
+ */
void br_fdb_delete_by_port(struct net_bridge *br,
const struct net_bridge_port *p,
int do_all)
@@ -142,7 +146,8 @@
hlist_for_each_safe(h, g, &br->hash[i]) {
struct net_bridge_fdb_entry *f
= hlist_entry(h, struct net_bridge_fdb_entry, hlist);
- if (f->dst != p)
+
+ if (p && f->dst != p)
continue;
if (f->is_static && !do_all)
@@ -152,7 +157,7 @@
* then when one port is deleted, assign
* the local entry to other port
*/
- if (f->is_local) {
+ if (p && f->is_local) {
struct net_bridge_port *op;
list_for_each_entry(op, &br->port_list, list) {
if (op != p &&
--
Stephen Hemminger <shemminger@xxxxxxxxxxxxxxxxxxxx>
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