[NETLINK]: Add notification message sending interface

Adds nlmsg_notify() implementing proper notification logic. The
message is multicasted to all listeners in the group. The
applications the requests orignates from can request a unicast
back report in which case said socket will be excluded from the
multicast to avoid duplicated notifications.

nlmsg_multicast() is extended to take allocation flags to
allow notification in atomic contexts.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 75bb47a898dd..d32599116c56 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -510,7 +510,7 @@ static int genl_ctrl_event(int event, void *data)
                 if (IS_ERR(msg))
                         return PTR_ERR(msg);
 
-                genlmsg_multicast(msg, 0, GENL_ID_CTRL);
+                genlmsg_multicast(msg, 0, GENL_ID_CTRL, GFP_KERNEL);
                 break;
         }