netdev - Re: [PATCH net-next 2/4] udp: Handle large UFO packets from untrusted sources

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Message-ID: <4A2F49DB.20207@us.ibm.com>
Date:	Tue, 09 Jun 2009 22:51:23 -0700
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	davem@...emloft.net, netdev@...r.kernel.org, kvm@...r.kernel.org,
	rusty@...tcorp.com.au
Subject: Re: [PATCH net-next 2/4] udp: Handle large UFO packets from	untrusted
 sources

Herbert Xu wrote:
> On Mon, Jun 08, 2009 at 10:04:47AM -0700, Sridhar Samudrala wrote:
>   
>> OK. Can we use skb_segment() to do IP fragmentation of UDP packets?
>>     
>
> It should be able to.
>   
Unfortunately, this doesn't work for UDP without any changes. 
skb_segment() currently adds transport header to
each segmented skb. But when we are using IP fragmentation, only the 
first fragment should include the UDP
header.
We either need to fix skb_segment() to handle IP fragmentation or write 
a new skb_fragment(). I will look into
this when i get some time.

Thanks
Sridhar

>   
>> The function itself looks protocol independent and if it is simply
>> splitting large skb into a list of mtu sized skb's, can we fixup the
>> ip header differently for UDP packets(id and frag_off) in inet_gso_segment
>> and ipv6_gso_segment?
>>     
>
> Yes that's the idea.
>
> Cheers,
>   


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