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[NETLINK]: Add notification message sending interface

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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>
This commit is contained in:
Thomas Graf
2006-08-15 00:31:06 -07:00
committed by David S. Miller
parent 2942e90050
commit d387f6ad10
5 changed files with 42 additions and 7 deletions
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6
include/net/netlink.h
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@@ -43,6 +43,7 @@
* Message Sending:
* nlmsg_multicast() multicast message to several groups
* nlmsg_unicast() unicast a message to a single socket
* nlmsg_notify() send notification message
*
* Message Length Calculations:
* nlmsg_msg_size(payload) length of message w/o padding
@@ -545,15 +546,16 @@ static inline void nlmsg_free(struct sk_buff *skb)
* @skb: netlink message as socket buffer
* @pid: own netlink pid to avoid sending to yourself
* @group: multicast group id
* @flags: allocation flags
*/
static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb,
u32 pid, unsigned int group)
u32 pid, unsigned int group, gfp_t flags)
{
int err;
NETLINK_CB(skb).dst_group = group;
err = netlink_broadcast(sk, skb, pid, group, GFP_KERNEL);
err = netlink_broadcast(sk, skb, pid, group, flags);
if (err > 0)
err = 0;