linux-kernel - Re: [PATCH] netlink: fix append of whole original message on negative ack.

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Message-Id: <20081023.134513.267548182.davem@davemloft.net>
Date:	Thu, 23 Oct 2008 13:45:13 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	michellammertink@...il.com
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netlink: fix append of whole original message on
 negative ack.

From: M Lammertink <michellammertink@...il.com>
Date: Thu, 23 Oct 2008 20:17:51 +0200

You'll get a much better review of this if you send it to
the netdev mailing list, which is where all the networking
developers are subscribed.  They don't read linux-kernel

Added to CC:

> From: Michel Lammertink <mlammertink <at> ti-wmc.nl>
> Signed-off-by: Michel Lammertink <mlammertink <at> ti-wmc.nl>
> 
> Netlink can return an negative acknowledgement, which AFAICT should include an error code and the whole original message. This patch fixes the size argument given to the __nlmsg_put call. Without this patch only the original header was attached.
> ---
> 
> Can anyone explain to me why struct nlmsgerr contains an int error and the nlmsghdr struct. The comment in netlink_ack states that the whole message should be appended. Why not only include an int error in struct nlmsgerr and just append the original message?
> 
> Comments appreciated.
> 
> diff -uprN linux-2.6.27.3.orig/net/netlink/af_netlink.c linux-2.6.27.3/net/netlink/af_netlink.c
> --- linux-2.6.27.3.orig/net/netlink/af_netlink.c	2008-10-23 18:01:54.000000000 +0200
> +++ linux-2.6.27.3/net/netlink/af_netlink.c	2008-10-23 18:04:22.000000000 +0200
> @@ -1656,7 +1656,7 @@ void netlink_ack(struct sk_buff *in_skb,
>  	}
>  
>  	rep = __nlmsg_put(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq,
> -			  NLMSG_ERROR, sizeof(struct nlmsgerr), 0);
> +			  NLMSG_ERROR, payload, 0);
>  	errmsg = nlmsg_data(rep);
>  	errmsg->error = err;
>  	memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(*nlh));
> --
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