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From: Felix Fietkau <nbd@nbd.name>
Subject: [PATCH] bridge: port isolate
Isolating individual bridge ports
---
--- a/include/linux/if_bridge.h
+++ b/include/linux/if_bridge.h
@@ -45,6 +45,7 @@ struct br_ip_list {
#define BR_PROXYARP BIT(8)
#define BR_LEARNING_SYNC BIT(9)
#define BR_PROXYARP_WIFI BIT(10)
+#define BR_ISOLATE_MODE BIT(11)
extern void brioctl_set(int (*ioctl_hook)(struct net *, unsigned int, void __user *));
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -173,6 +173,22 @@ BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD
BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
+static ssize_t show_isolate_mode(struct net_bridge_port *p, char *buf)
+{
+ int isolate_mode = (p->flags & BR_ISOLATE_MODE) ? 1 : 0;
+ return sprintf(buf, "%d\n", isolate_mode);
+}
+static ssize_t store_isolate_mode(struct net_bridge_port *p, unsigned long v)
+{
+ if (v)
+ p->flags |= BR_ISOLATE_MODE;
+ else
+ p->flags &= ~BR_ISOLATE_MODE;
+ return 0;
+}
+static BRPORT_ATTR(isolate_mode, S_IRUGO | S_IWUSR,
+ show_isolate_mode, store_isolate_mode);
+
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
{
@@ -217,6 +233,7 @@ static const struct brport_attribute *br
#endif
&brport_attr_proxyarp,
&brport_attr_proxyarp_wifi,
+ &brport_attr_isolate_mode,
NULL
};
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -185,8 +185,8 @@ int br_handle_frame_finish(struct sock *
unicast = false;
br->dev->stats.multicast++;
- } else if ((dst = __br_fdb_get(br, dest, vid)) &&
- dst->is_local) {
+ } else if ((p->flags & BR_ISOLATE_MODE) ||
+ ((dst = __br_fdb_get(br, dest, vid)) && dst->is_local)) {
skb2 = skb;
/* Do not forward the packet since it's local. */
skb = NULL;
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -119,7 +119,7 @@ EXPORT_SYMBOL_GPL(br_deliver);
/* called with rcu_read_lock */
void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, struct sk_buff *skb0)
{
- if (should_deliver(to, skb)) {
+ if (should_deliver(to, skb) && !(to->flags & BR_ISOLATE_MODE)) {
if (skb0)
deliver_clone(to, skb, __br_forward);
else
@@ -175,7 +175,7 @@ static void br_flood(struct net_bridge *
struct sk_buff *skb0,
void (*__packet_hook)(const struct net_bridge_port *p,
struct sk_buff *skb),
- bool unicast)
+ bool unicast, bool forward)
{
struct net_bridge_port *p;
struct net_bridge_port *prev;
@@ -183,6 +183,8 @@ static void br_flood(struct net_bridge *
prev = NULL;
list_for_each_entry_rcu(p, &br->port_list, list) {
+ if (forward && (p->flags & BR_ISOLATE_MODE))
+ continue;
/* Do not flood unicast traffic to ports that turn it off */
if (unicast && !(p->flags & BR_FLOOD))
continue;
@@ -217,14 +219,14 @@ out:
/* called with rcu_read_lock */
void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast)
{
- br_flood(br, skb, NULL, __br_deliver, unicast);
+ br_flood(br, skb, NULL, __br_deliver, unicast, false);
}
/* called under bridge lock */
void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
struct sk_buff *skb2, bool unicast)
{
- br_flood(br, skb, skb2, __br_forward, unicast);
+ br_flood(br, skb, skb2, __br_forward, unicast, true);
}
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
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