netdev - Re: PROBLEM: IPv6 TCP-Connections resetting

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Message-ID: <51605EC8.7090900@cogentembedded.com>
Date:	Sat, 06 Apr 2013 21:43:36 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	christoph.paasch@...ouvain.be
CC:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Tetja Rediske <tetja@...ja.de>, djduanjiong@...il.com,
	netdev@...r.kernel.org, steffen.klassert@...unet.com,
	Neal Cardwell <ncardwell@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>
Subject: Re: PROBLEM: IPv6 TCP-Connections resetting

Hello.

On 06-04-2013 13:18, Christoph Paasch wrote:

> From: Christoph Paasch <christoph.paasch@...ouvain.be>
> Date: Sat, 6 Apr 2013 10:21:01 +0200
> Subject: [PATCH] ipv6/tcp: Stop processing ICMPv6 redirect messages

> Upon reception of an ICMPv6 Redirect message, we should not continue
> inside tcp_v6_err. Otherwise, an error will be reported or request-socks
> will be closed.

> Adds also some parantheses to respect codingstyle guidelines.

    When you say "älso", it's often a good indicator there should be another 
patch -- like in this case.

> Reported-by: Tetja Rediske <tetja@...ja.de>
> Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>
> ---
>   net/ipv6/tcp_ipv6.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)

> diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
> index 1033d2b..24434c5 100644
> --- a/net/ipv6/tcp_ipv6.c
> +++ b/net/ipv6/tcp_ipv6.c
> @@ -386,6 +386,7 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
>
>   		if (dst)
>   			dst->ops->redirect(dst, sk, skb);
> +		goto out;
>   	}
>
>   	if (type == ICMPV6_PKT_TOOBIG) {
> @@ -441,16 +442,18 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
>   			sk->sk_error_report(sk);		/* Wake people up to see the error (see connect in sock.c) */
>
>   			tcp_done(sk);
> -		} else
> +		} else {
>   			sk->sk_err_soft = err;
> +		}
>   		goto out;
>   	}
>
>   	if (!sock_owned_by_user(sk) && np->recverr) {
>   		sk->sk_err = err;
>   		sk->sk_error_report(sk);
> -	} else
> +	} else {
>   		sk->sk_err_soft = err;
> +	}
>
>   out:
>   	bh_unlock_sock(sk);

WBR, Sergei

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