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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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Thomas Graf 2006-08-15 00:31:06 -07:00 • committed by David S. Miller
commit d387f6ad10
5 changed files with 42 additions and 7 deletions
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34
net/netlink/af_netlink.c
View file

@ -1549,6 +1549,38 @@ void netlink_queue_skip(struct nlmsghdr *nlh, struct sk_buff *skb)
skb_pull(skb, msglen);
}
/**
* nlmsg_notify - send a notification netlink message
* @sk: netlink socket to use
* @skb: notification message
* @pid: destination netlink pid for reports or 0
* @group: destination multicast group or 0
* @report: 1 to report back, 0 to disable
* @flags: allocation flags
*/
int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 pid,
unsigned int group, int report, gfp_t flags)
{
int err = 0;
if (group) {
int exclude_pid = 0;
if (report) {
atomic_inc(&skb->users);
exclude_pid = pid;
}
/* errors reported via destination sk->sk_err */
nlmsg_multicast(sk, skb, exclude_pid, group, flags);
}
if (report)
err = nlmsg_unicast(sk, skb, pid);
return err;
}
#ifdef CONFIG_PROC_FS
struct nl_seq_iter {
int link;
@ -1802,4 +1834,4 @@ EXPORT_SYMBOL(netlink_set_err);
EXPORT_SYMBOL(netlink_set_nonroot);
EXPORT_SYMBOL(netlink_unicast);
EXPORT_SYMBOL(netlink_unregister_notifier);
EXPORT_SYMBOL(nlmsg_notify);

2
net/netlink/genetlink.c
View file

@ -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;
}