netdev - Re: bridge: Do not compile options in br_parse_ip

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Date:	Mon, 06 Oct 2014 00:53:25 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	fw@...len.de, netfilter-devel@...r.kernel.org, bsd@...hat.com,
	stephen@...workplumber.org, netdev@...r.kernel.org,
	eric.dumazet@...il.com, davidn@...idnewall.com
Subject: Re: bridge: Do not compile options in br_parse_ip_options

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Sat, 4 Oct 2014 22:18:02 +0800

> bridge: Do not compile options in br_parse_ip_options
> 
> Commit 462fb2af9788a82a534f8184abfde31574e1cfa0
> 
> 	bridge : Sanitize skb before it enters the IP stack
> 
> broke when IP options are actually used because it mangles the
> skb as if it entered the IP stack which is wrong because the
> bridge is supposed to operate below the IP stack.
> 
> Since nobody has actually requested for parsing of IP options
> this patch fixes it by simply reverting to the previous approach
> of ignoring all IP options, i.e., zeroing the IPCB.
> 
> If and when somebody who uses IP options and actually needs them
> to be parsed by the bridge complains then we can revisit this.
> 
> Reported-by: David Newall <davidn@...idnewall.com>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Agreed that mangling the packet is definitely wrong here, and since
you preserve the CB clearing this change should be fine.

Please submit this formally after it's been tested.

Thanks.
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