netdev - Re: [PATCH net v2 2/4] ipv4: add defensive check for CHECKSUM_PARTIAL skbs in ip

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Message-Id: <1445973327.507378.421829321.15264A08@webmail.messagingengine.com>
Date:	Tue, 27 Oct 2015 20:15:27 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	netdev@...r.kernel.org
Cc:	edumazet@...gle.com, vyasevich@...il.com, bcodding@...hat.com,
	tom@...bertland.com
Subject: Re: [PATCH net v2 2/4] ipv4: add defensive check for CHECKSUM_PARTIAL
 skbs in ip_fragment

Hi Sergei,

On Tue, Oct 27, 2015, at 20:01, Sergei Shtylyov wrote:
> On 10/27/2015 06:02 PM, Hannes Frederic Sowa wrote:
> 
> > CHECKSUM_PARTIAL skbs should never arrive in ip_fragment. If we get one
> > of those warn about them once and handle them gracefully by recalculating
> > the checksum.
> >
> > Cc: Eric Dumazet <edumazet@...gle.com>
> > Cc: Vlad Yasevich <vyasevich@...il.com>
> > Cc: Benjamin Coddington <bcodding@...hat.com>
> > Cc: Tom Herbert <tom@...bertland.com>
> > Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> > ---
> >   net/ipv4/ip_output.c | 8 +++++---
> >   1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
> > index 0b02417..3f94a3b 100644
> > --- a/net/ipv4/ip_output.c
> > +++ b/net/ipv4/ip_output.c
> > @@ -533,6 +533,11 @@ int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
> >
> >   	dev = rt->dst.dev;
> >
> > +	/* for offloaded checksums cleanup checksum before fragmentation */
> > +	if (WARN_ON_ONCE(skb->ip_summed == CHECKSUM_PARTIAL) &&
> > +	    (err = skb_checksum_help(skb)))
> 
>     scripts/checkpatch.pl shou;d have complained about using = in the
>     *if* 
> expression.

I know and I ignored it deliberately because I found it nicer this way.
I made sure gcc does not complain by using extra braces around the
assignment.

Bye,
Hannes
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