netdev - Re: [PATCHv2] ipv6: Fix ip6_xmit to send fragments if ipfragok is true

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Message-ID: <20080731104149.GA7601@gondor.apana.org.au>
Date:	Thu, 31 Jul 2008 18:41:50 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Wei Yongjun <yjwei@...fujitsu.com>
Cc:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCHv2] ipv6: Fix ip6_xmit to send fragments if ipfragok is true

On Thu, Jul 31, 2008 at 05:55:29PM +0800, Wei Yongjun wrote:
> SCTP used ip6_xmit() to send fragments after received ICMP packet too
> big message. But while send packet used ip6_xmit, the skb->local_df is
> not initialized. So when skb if enter ip6_fragment(), the following
> code will discard the skb.
> 
> ip6_fragment(...)
> {
>    if (!skb->local_df) {
>        ...
>        return -EMSGSIZE;
>    }
>    ...
> }
> 
> SCTP do the following step:
> 1. send packet ip6_xmit(skb, ipfragok=0)
> 2. received ICMP packet too big message
> 3. if PMTUD_ENABLE: ip6_xmit(skb, ipfragok=1)
> 
> This patch fixed the problem by set local_df if ipfragok is true.
> 
> Signed-off-by: Wei Yongjun <yjwei@...fujitsu.com>

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks,
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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