netdev - Re: [PATCH net] sctp: use the old asoc when making the cookie-ack chunk in dupcook

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Date:   Wed, 2 May 2018 07:46:35 -0400
From:   Neil Horman <nhorman@...driver.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        davem@...emloft.net,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Subject: Re: [PATCH net] sctp: use the old asoc when making the cookie-ack
 chunk in dupcook_d

On Wed, May 02, 2018 at 01:39:46PM +0800, Xin Long wrote:
> When processing a duplicate cookie-echo chunk, for case 'D', sctp will
> not process the param from this chunk. It means old asoc has nothing
> to be updated, and the new temp asoc doesn't have the complete info.
> 
> So there's no reason to use the new asoc when creating the cookie-ack
> chunk. Otherwise, like when auth is enabled for cookie-ack, the chunk
> can not be set with auth, and it will definitely be dropped by peer.
> 
> This issue is there since very beginning, and we fix it by using the
> old asoc instead.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>
> ---
>  net/sctp/sm_statefuns.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> index 98acfed..28c070e 100644
> --- a/net/sctp/sm_statefuns.c
> +++ b/net/sctp/sm_statefuns.c
> @@ -2056,7 +2056,7 @@ static enum sctp_disposition sctp_sf_do_dupcook_d(
>  		}
>  	}
>  
> -	repl = sctp_make_cookie_ack(new_asoc, chunk);
> +	repl = sctp_make_cookie_ack(asoc, chunk);
>  	if (!repl)
>  		goto nomem;
>  
> -- 
> 2.1.0
> 
> --
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> 
Acked-by: Neil Horman <nhorman@...driver.com>