On Mon, Jan 30, 2006 at 07:58:17PM +0100, Patrick McHardy wrote:
> This is the patch for checking for netlink multicast listeners.
>
> Jamal, does this fit your needs?
> [NETLINK]: Add netlink_has_listeners() for checking for multicast listeners
>
> Signed-off-by: Patrick McHardy <[EMAIL PROTECTED]>
>
> @@ -806,6 +829,17 @@ retry:
> return netlink_sendskb(sk, skb, ssk->sk_protocol);
> }
>
> +int netlink_has_listeners(struct sock *sk, unsigned int group)
> +{
> + int res = 0;
> +
> + read_lock(&nl_table_lock);
> + if (group - 1 < nl_table[sk->sk_protocol].groups)
> + res = test_bit(group - 1, nl_table[sk->sk_protocol].listeners);
> + read_unlock(&nl_table_lock);
> + return res;
> +}
> +
Unfortunately this is a bit too heavy weight. He needs it on the packet
rx/tx path. Perhaps RCU would help?
Thanks,
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