From a580c76d534c7360ba68042b19cb255e8420e987 Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Fri, 24 Jan 2020 13:40:22 +0200 Subject: net: bridge: vlan: add per-vlan state The first per-vlan option added is state, it is needed for EVPN and for per-vlan STP. The state allows to control the forwarding on per-vlan basis. The vlan state is considered only if the port state is forwarding in order to avoid conflicts and be consistent. br_allowed_egress is called only when the state is forwarding, but the ingress case is a bit more complicated due to the fact that we may have the transition between port:BR_STATE_FORWARDING -> vlan:BR_STATE_LEARNING which should still allow the bridge to learn from the packet after vlan filtering and it will be dropped after that. Also to optimize the pvid state check we keep a copy in the vlan group to avoid one lookup. The state members are modified with *_ONCE() to annotate the lockless access. Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- net/bridge/br_input.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'net/bridge/br_input.c') diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index 8944ceb47fe9..fcc260840028 100644 --- a/net/bridge/br_input.c +++ b/net/bridge/br_input.c @@ -76,11 +76,14 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb bool local_rcv, mcast_hit = false; struct net_bridge *br; u16 vid = 0; + u8 state; if (!p || p->state == BR_STATE_DISABLED) goto drop; - if (!br_allowed_ingress(p->br, nbp_vlan_group_rcu(p), skb, &vid)) + state = p->state; + if (!br_allowed_ingress(p->br, nbp_vlan_group_rcu(p), skb, &vid, + &state)) goto out; nbp_switchdev_frame_mark(p, skb); @@ -103,7 +106,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb } } - if (p->state == BR_STATE_LEARNING) + if (state == BR_STATE_LEARNING) goto drop; BR_INPUT_SKB_CB(skb)->brdev = br->dev; -- cgit