netdev - Re: [PATCH] ipv6: Do route updating for redirect in ndisc layer

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Message-ID: <20130910225023.GB4794@order.stressinduktion.org>
Date:	Wed, 11 Sep 2013 00:50:23 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Duan Jiong <duanj.fnst@...fujitsu.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: Do route updating for redirect in ndisc layer

On Mon, Sep 09, 2013 at 03:09:56PM +0800, Duan Jiong wrote:
> diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
> index 5c71501..61fe8e5 100644
> --- a/net/ipv6/tcp_ipv6.c
> +++ b/net/ipv6/tcp_ipv6.c
> @@ -382,14 +382,6 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
>  
>  	np = inet6_sk(sk);
>  
> -	if (type == NDISC_REDIRECT) {
> -		struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
> -
> -		if (dst)
> -			dst->ops->redirect(dst, sk, skb);
> -		goto out;
> -	}
> -

You dropped the "goto out" here in case of an NDISC_REDIRECT, so this sends an
EPROTO further up the socket layer. Was this intended?

Also:

In some _err() functions there is this check, e.g. ah6.c:

    621         if (type != ICMPV6_DEST_UNREACH &&
    622             type != ICMPV6_PKT_TOOBIG &&
    623             type != NDISC_REDIRECT)
    624                 return;

It could actually be adjusted now as we don't handle NDISC_REDIRECTs here any
more. I don't see any side-effects down the code in these functions. We could
also only just match on ICMPV6_PKT_TOOBIG. Can you confirm?

Greetings,

  Hannes

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