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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
@@ -47,6 +47,7 @@ struct br_ip_list {
#define BR_PROXYARP_WIFI BIT(10)
#define BR_MCAST_FLOOD BIT(11)
#define BR_MULTICAST_TO_UNICAST BIT(12)
+#define BR_ISOLATE_MODE BIT(13)
#define BR_DEFAULT_AGEING_TIME (300 * HZ)
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -172,6 +172,7 @@ BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD
BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
+BRPORT_ATTR_FLAG(isolate_mode, BR_ISOLATE_MODE);
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
@@ -220,6 +221,7 @@ static const struct brport_attribute *br
&brport_attr_proxyarp,
&brport_attr_proxyarp_wifi,
&brport_attr_multicast_flood,
+ &brport_attr_isolate_mode,
NULL
};
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -141,6 +141,9 @@ static int deliver_clone(const struct ne
void br_forward(const struct net_bridge_port *to,
struct sk_buff *skb, bool local_rcv, bool local_orig)
{
+ if (to->flags & BR_ISOLATE_MODE)
+ to = NULL;
+
if (to && should_deliver(to, skb)) {
if (local_rcv)
deliver_clone(to, skb, local_orig);
@@ -206,6 +209,8 @@ void br_flood(struct net_bridge *br, str
struct net_bridge_port *p;
list_for_each_entry_rcu(p, &br->port_list, list) {
+ if (!local_orig && (p->flags & BR_ISOLATE_MODE))
+ continue;
/* Do not flood unicast traffic to ports that turn it off */
if (pkt_type == BR_PKT_UNICAST && !(p->flags & BR_FLOOD))
continue;
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -174,6 +174,9 @@ int br_handle_frame_finish(struct net *n
if (IS_ENABLED(CONFIG_INET) && skb->protocol == htons(ETH_P_ARP))
br_do_proxy_arp(skb, br, vid, p);
+ if (p->flags & BR_ISOLATE_MODE)
+ return br_pass_frame_up(skb);
+
switch (pkt_type) {
case BR_PKT_MULTICAST:
mdst = br_mdb_get(br, skb, vid);
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