netdev - Re: [PATCH] ipv6: udp packets following an UFO enqueued packet need also be handled by UFO

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Date:	Wed, 2 Oct 2013 14:10:39 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org,
	davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
	kaber@...sh.net, herbert@...dor.apana.org.au,
	hannes@...essinduktion.org
Subject: Re: [PATCH] ipv6: udp packets following an UFO enqueued packet need
 also be handled by UFO

Wed, Oct 02, 2013 at 01:53:55PM CEST, eric.dumazet@...il.com wrote:
>
>> This patch should fix this on ipv4 as well:
>> 
>> Subject: ip_output: do skb ufo init for peeked non ufo skb as well
>> 
>
>Is it an official patch ? s/Subject:/[PATCH]/ 

Yes. I thought that to state "Subject:" is enough for patchwork to parse
it. Apparently not :/

>
>> Now, if user application does:
>
>Any idea when the bug was added (commit id + title) ?

This is hard to say. This code is more or less broken from the very
beginning, which is:

commit e89e9cf539a28df7d0eb1d0a545368e9920b34ac "[IPv4/IPv6]: UFO Scatter-gather approach"

>
>> sendto len<mtu flag MSG_MORE
>> sendto len>mtu flag 0
>> The skb is not treated as fragmented one because it is not initialized
>> that way. So move the initialization to fix this.
>> 
>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>> ---
>>  net/ipv4/ip_output.c | 14 +++++++++-----
>>  1 file changed, 9 insertions(+), 5 deletions(-)
>> 
>> diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
>> index a04d872..bd21c5d 100644
>> --- a/net/ipv4/ip_output.c
>> +++ b/net/ipv4/ip_output.c
>> @@ -772,15 +772,19 @@ static inline int ip_ufo_append_data(struct sock *sk,
>>  		/* initialize protocol header pointer */
>>  		skb->transport_header = skb->network_header + fragheaderlen;
>>  
>> -		skb->ip_summed = CHECKSUM_PARTIAL;
>>  		skb->csum = 0;
>
>Any idea why we have skb->csum = 0 here ?

If I understand this correctly, that can be removed from here.


>
>Thanks !
>
>
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