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net: bridge: add vlan mcast snooping knob

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Add a global knob that controls if vlan multicast snooping is enabled.
The proper contexts (vlan or bridge-wide) will be chosen based on the knob
when processing packets and changing bridge device state. Note that
vlans have their individual mcast snooping enabled by default, but this
knob is needed to turn on bridge vlan snooping. It is disabled by
default. To enable the knob vlan filtering must also be enabled, it
doesn't make sense to have vlan mcast snooping without vlan filtering
since that would lead to inconsistencies. Disabling vlan filtering will
also automatically disable vlan mcast snooping.

Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov
2021-07-19 20:06:28 +03:00
committed by David S. Miller
parent 7b54aaaf53
commit f4b7002a70
7 changed files with 173 additions and 46 deletions
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5
net/bridge/br_input.c
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@@ -73,6 +73,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
struct net_bridge_mdb_entry *mdst;
bool local_rcv, mcast_hit = false;
struct net_bridge_mcast *brmctx;
struct net_bridge_vlan *vlan;
struct net_bridge *br;
u16 vid = 0;
u8 state;
@@ -84,7 +85,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
pmctx = &p->multicast_ctx;
state = p->state;
if (!br_allowed_ingress(p->br, nbp_vlan_group_rcu(p), skb, &vid,
&state))
&state, &vlan))
goto out;
nbp_switchdev_frame_mark(p, skb);
@@ -102,7 +103,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
local_rcv = true;
} else {
pkt_type = BR_PKT_MULTICAST;
if (br_multicast_rcv(brmctx, pmctx, skb, vid))
if (br_multicast_rcv(&brmctx, &pmctx, vlan, skb, vid))
goto drop;
}
}