netdev - Re: Bugzilla 42595

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Message-ID: <1326884311.2316.5.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Wed, 18 Jan 2012 11:58:31 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tore Anderson <tore@....no>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Bugzilla 42595

Le mercredi 18 janvier 2012 à 00:43 +0100, Eric Dumazet a écrit :
> Le mardi 17 janvier 2012 à 21:03 +0100, Tore Anderson a écrit :
> 
> > 
> > 3) There seems to be a bug related to generating the TCP checksum of
> > SYN/ACK packets to destinations with the allfrag features set. I just
> > submitted a bug report about this:
> > 
> > https://bugzilla.kernel.org/show_bug.cgi?id=42595
> > 
> > This makes the allfrag feature pretty much useless for me, as I can only
> > successfully establish a single TCP session from a client behind a <1280
> > MTU link for the entire lifetime of the routing cache entry.
> > 
> 
> It seems we dont handle skb ip_summed CHECKSUM_PARTIAL 
> in ip6_fragment() slow_path


and many drivers dont handle the presence of a frag header.

if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)

I suspect we'll have to compute the checksum in software...


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