netdev - Re: [RFC] netlink broadcast return value

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Date:	Thu, 12 Feb 2009 13:41:22 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Patrick McHardy <kaber@...sh.net>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [RFC] netlink broadcast return value

Pablo Neira Ayuso wrote:
> Patrick, I like it, I'm fine with this approach as soon as it let me add
> the "reliable" ctnetlink state-change reporting. I can add the following
> on top of the patch that David already applied:
> 
> --- a/net/netlink/af_netlink.c
> +++ b/net/netlink/af_netlink.c
> [...]
> @@ -999,6 +1000,7 @@ static inline int do_one_broadcast(struct sock *sk,
>  		p->skb2 = NULL;
>  	} else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) {
>  		netlink_overrun(sk);
> +		p->delivery_failure = 1;
>                 ^^^^^^^^^^^^^^^^^^^^^^^^
> Replace this by:
> +		if (nlk->flags & NETLINK_HIGHLY_RELIABLE)
> +			p->delivery_failure = 1;
> 
> And include the flag definition and setsockopt() operations in the new
> patch, of course.

Oh, and also for this:

> 	if (p->skb2 == NULL) {
> 		netlink_overrun(sk);
> 		/* Clone failed. Notify ALL listeners. */
> 		p->failure = 1;
                ^^^^^^^^^^^^^^^

if (nlk->flags & NETLINK_HIGHLY_RELIABLE)
	p->failure = 1;

-- 
"Los honestos son inadaptados sociales" -- Les Luthiers
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