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net: bridge: factor out port flooding

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Factor out port flooding code into its own helper, it will be used by later
changes to flood to specific port VLANs. No functional changes intended.

Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260918152950.1938259-3-razor@blackwall.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Nikolay Aleksandrov 2026-09-18 18:29:43 +03:00 committed by Jakub Kicinski
parent d7fddeed32
commit 25622bef88
1 changed files with 43 additions and 34 deletions
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77
net/bridge/br_forward.c
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@ -219,6 +219,48 @@ static void br_flood_finish(struct net_bridge_port *prev, struct sk_buff *skb,
__br_forward(prev, skb, local_orig);
}
static void br_flood_port(struct net_bridge_port **prev,
struct net_bridge_port *p, struct sk_buff *skb,
enum br_pkt_type pkt_type, bool local_orig, u16 vid)
{
/* Do not flood unicast traffic to ports that turn it off, nor
* other traffic if flood off, except for traffic we originate
*/
switch (pkt_type) {
case BR_PKT_UNICAST:
if (!test_bit(BR_FLOOD_BIT, &p->flags))
return;
break;
case BR_PKT_MULTICAST:
if (!test_bit(BR_MCAST_FLOOD_BIT, &p->flags) &&
skb->dev != p->br->dev)
return;
break;
case BR_PKT_BROADCAST:
if (!test_bit(BR_BCAST_FLOOD_BIT, &p->flags) &&
skb->dev != p->br->dev)
return;
break;
}
/* Do not flood to ports that enable proxy ARP */
if (test_bit(BR_PROXYARP_BIT, &p->flags))
return;
if (BR_INPUT_SKB_CB(skb)->proxyarp_replied) {
if (test_bit(BR_PROXYARP_WIFI_BIT, &p->flags))
return;
/* For gratuitous ARPs/NAs, check neigh_forward_grat.
* For regular ARPs/NDs, check only neigh_suppress.
*/
if (br_is_neigh_suppress_enabled(p, vid) &&
(!BR_INPUT_SKB_CB(skb)->grat_arp ||
!br_is_neigh_forward_grat_enabled(p, vid)))
return;
}
*prev = maybe_deliver(*prev, p, skb, local_orig);
}
/* called under rcu_read_lock */
void br_flood(struct net_bridge *br, struct sk_buff *skb,
enum br_pkt_type pkt_type, bool local_rcv, bool local_orig,
@ -230,40 +272,7 @@ void br_flood(struct net_bridge *br, struct sk_buff *skb,
br_tc_skb_miss_set(skb, pkt_type != BR_PKT_BROADCAST);
list_for_each_entry_rcu(p, &br->port_list, list) {
/* Do not flood unicast traffic to ports that turn it off, nor
* other traffic if flood off, except for traffic we originate
*/
switch (pkt_type) {
case BR_PKT_UNICAST:
if (!test_bit(BR_FLOOD_BIT, &p->flags))
continue;
break;
case BR_PKT_MULTICAST:
if (!test_bit(BR_MCAST_FLOOD_BIT, &p->flags) && skb->dev != br->dev)
continue;
break;
case BR_PKT_BROADCAST:
if (!test_bit(BR_BCAST_FLOOD_BIT, &p->flags) && skb->dev != br->dev)
continue;
break;
}
/* Do not flood to ports that enable proxy ARP */
if (test_bit(BR_PROXYARP_BIT, &p->flags))
continue;
if (BR_INPUT_SKB_CB(skb)->proxyarp_replied) {
if (test_bit(BR_PROXYARP_WIFI_BIT, &p->flags))
continue;
/* For gratuitous ARPs/NAs, check neigh_forward_grat.
* For regular ARPs/NDs, check only neigh_suppress.
*/
if (br_is_neigh_suppress_enabled(p, vid) &&
(!BR_INPUT_SKB_CB(skb)->grat_arp ||
!br_is_neigh_forward_grat_enabled(p, vid)))
continue;
}
prev = maybe_deliver(prev, p, skb, local_orig);
br_flood_port(&prev, p, skb, pkt_type, local_orig, vid);
if (IS_ERR(prev))
break;
}