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ipv4: Send a netevent whenever multipath hash policy is changed

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Devices performing IPv4 forwarding need to update their multipath hash
policy whenever it is changed.

Inform these devices by generating a netevent.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2017-11-02 17:14:05 +01:00 committed by David S. Miller
parent a882d20cdb
commit 3ae6ec0829
2 changed files with 20 additions and 1 deletions
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1
include/net/netevent.h
View file

@ -25,6 +25,7 @@ enum netevent_notif_type {
NETEVENT_NEIGH_UPDATE = 1, /* arg is struct neighbour ptr */
NETEVENT_REDIRECT, /* arg is struct netevent_redirect ptr */
NETEVENT_DELAY_PROBE_TIME_UPDATE, /* arg is struct neigh_parms ptr */
NETEVENT_MULTIPATH_HASH_UPDATE, /* arg is struct net ptr */
};
int register_netevent_notifier(struct notifier_block *nb);

20
net/ipv4/sysctl_net_ipv4.c
View file

@ -25,6 +25,7 @@
#include <net/inet_frag.h>
#include <net/ping.h>
#include <net/protocol.h>
#include <net/netevent.h>
static int zero;
static int one = 1;
@ -385,6 +386,23 @@ static int proc_tcp_available_ulp(struct ctl_table *ctl,
return ret;
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
{
struct net *net = container_of(table->data, struct net,
ipv4.sysctl_fib_multipath_hash_policy);
int ret;
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
if (write && ret == 0)
call_netevent_notifiers(NETEVENT_MULTIPATH_HASH_UPDATE, net);
return ret;
}
#endif
static struct ctl_table ipv4_table[] = {
{
.procname = "tcp_max_orphans",
@ -907,7 +925,7 @@ static struct ctl_table ipv4_net_table[] = {
.data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.proc_handler = proc_fib_multipath_hash_policy,
.extra1 = &zero,
.extra2 = &one,
},