Re: [PATCH] net: Use nlmsg_unicast() instead of netlink_unicast()

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

On Mon, Jul 12, 2021 at 08:53:01PM +0800, Yajun Deng wrote:
> diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
> index 639c337c885b..aa3397eec330 100644
> --- a/net/netfilter/nft_compat.c
> +++ b/net/netfilter/nft_compat.c
> @@ -683,10 +683,8 @@ static int nfnl_compat_get_rcu(struct sk_buff *skb,
>  		goto out_put;
>  	}
>  
> -	ret = netlink_unicast(info->sk, skb2, NETLINK_CB(skb).portid,
> -			      MSG_DONTWAIT);
> -	if (ret > 0)
> -		ret = 0;
> +	ret = nlmsg_unicast(info->sk, skb2, NETLINK_CB(skb).portid);

netfilter needs nfnetlink_unicast to deal with EAGAIN, see e0241ae6ac59

So either:

a) use nfnetlink_unicast.
b) remove this chunk and I'll route a patch to fix this in the
   netfilter tree.

Pick one at your choice.

Thanks.

>  out_put:
>  	rcu_read_lock();
>  	module_put(THIS_MODULE);