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bridge: Add port-level netlink handling for neigh_forward_grat

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Add netlink handlers for the port-level neigh_forward_grat option via
IFLA_BRPORT_NEIGH_FORWARD_GRAT attribute.

The default value of OFF preserves existing behavior, i.e. gratuitous ARP
and unsolicited NA are suppressed when neigh_suppress is enabled. Users can
explicitly set it to ON to allow these packets through.

Example for enabling control via 'bridge link' command:
 # bridge link set dev eth0 neigh_suppress on
 # bridge link set dev eth0 neigh_forward_grat on

Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20260511065936.4173106-5-danieller@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Danielle Ratson
2026-05-11 09:59:34 +03:00
committed by Paolo Abeni
parent 27c082c600
commit 2c75c438b9
1 changed files with 7 additions and 1 deletions
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8
net/bridge/br_netlink.c
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@@ -190,6 +190,7 @@ static inline size_t br_port_info_size(void)
+ nla_total_size(1) /* IFLA_BRPORT_LOCKED */
+ nla_total_size(1) /* IFLA_BRPORT_MAB */
+ nla_total_size(1) /* IFLA_BRPORT_NEIGH_VLAN_SUPPRESS */
+ nla_total_size(1) /* IFLA_BRPORT_NEIGH_FORWARD_GRAT */
+ nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_ROOT_ID */
+ nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_BRIDGE_ID */
+ nla_total_size(sizeof(u16)) /* IFLA_BRPORT_DESIGNATED_PORT */
@@ -282,7 +283,9 @@ static int br_port_fill_attrs(struct sk_buff *skb,
nla_put_u8(skb, IFLA_BRPORT_LOCKED, !!(p->flags & BR_PORT_LOCKED)) ||
nla_put_u8(skb, IFLA_BRPORT_MAB, !!(p->flags & BR_PORT_MAB)) ||
nla_put_u8(skb, IFLA_BRPORT_NEIGH_VLAN_SUPPRESS,
!!(p->flags & BR_NEIGH_VLAN_SUPPRESS)))
!!(p->flags & BR_NEIGH_VLAN_SUPPRESS)) ||
nla_put_u8(skb, IFLA_BRPORT_NEIGH_FORWARD_GRAT,
!!(p->flags & BR_NEIGH_FORWARD_GRAT)))
return -EMSGSIZE;
timerval = br_timer_value(&p->message_age_timer);
@@ -902,6 +905,7 @@ static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
[IFLA_BRPORT_MCAST_MAX_GROUPS] = { .type = NLA_U32 },
[IFLA_BRPORT_NEIGH_VLAN_SUPPRESS] = NLA_POLICY_MAX(NLA_U8, 1),
[IFLA_BRPORT_BACKUP_NHID] = { .type = NLA_U32 },
[IFLA_BRPORT_NEIGH_FORWARD_GRAT] = NLA_POLICY_MAX(NLA_U8, 1),
};
/* Change the state of the port and notify spanning tree */
@@ -970,6 +974,8 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[],
br_set_port_flag(p, tb, IFLA_BRPORT_MAB, BR_PORT_MAB);
br_set_port_flag(p, tb, IFLA_BRPORT_NEIGH_VLAN_SUPPRESS,
BR_NEIGH_VLAN_SUPPRESS);
br_set_port_flag(p, tb, IFLA_BRPORT_NEIGH_FORWARD_GRAT,
BR_NEIGH_FORWARD_GRAT);
if ((p->flags & BR_PORT_MAB) &&
(!(p->flags & BR_PORT_LOCKED) || !(p->flags & BR_LEARNING))) {