Drivers may make offloading decision based on whether
ip_forward_update_priority is enabled or not. Therefore distribute
netevent notifications to give them a chance to react to a change.
Signed-off-by: Petr Machata <petrm@xxxxxxxxxxxx>
Reviewed-by: Ido Schimmel <idosch@xxxxxxxxxxxx>
---
include/net/netevent.h | 1 +
net/ipv4/sysctl_net_ipv4.c | 19 ++++++++++++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/include/net/netevent.h b/include/net/netevent.h
index d9918261701c..4107016c3bb4 100644
--- a/include/net/netevent.h
+++ b/include/net/netevent.h
@@ -28,6 +28,7 @@ enum netevent_notif_type {
NETEVENT_DELAY_PROBE_TIME_UPDATE, /* arg is struct neigh_parms ptr */
NETEVENT_IPV4_MPATH_HASH_UPDATE, /* arg is struct net ptr */
NETEVENT_IPV6_MPATH_HASH_UPDATE, /* arg is struct net ptr */
+ NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE, /* arg is struct net ptr */
};
int register_netevent_notifier(struct notifier_block *nb);
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index e21dda015513..b92f422f2fa8 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -201,6 +201,23 @@ static int ipv4_ping_group_range(struct ctl_table *table, int write,
return ret;
}
+static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ struct net *net;
+ int ret;
+
+ net = container_of(table->data, struct net,
+ ipv4.sysctl_ip_fwd_update_priority);
+ ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+ if (write && ret == 0)
+ call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
+ net);
+
+ return ret;
+}
+
static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@@ -668,7 +685,7 @@ static struct ctl_table ipv4_net_table[] = {
.data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_dointvec_minmax,
+ .proc_handler = ipv4_fwd_update_priority,
.extra1 = &zero,
.extra2 = &one,
},
--
2.4.11
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