netdev - Re: [PATCH net-next 2/2] icmpv6_filter: allow ICMPv6 messages with bodies

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Message-Id: <20130802.151631.410609670256107560.davem@davemloft.net>
Date:	Fri, 02 Aug 2013 15:16:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	werner@...esberger.net
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] icmpv6_filter: allow ICMPv6 messages with
 bodies < 4 bytes

From: Werner Almesberger <werner@...esberger.net>
Date: Fri, 2 Aug 2013 10:51:34 -0300

> By using sizeof(_hdr), net/ipv6/raw.c:icmpv6_filter implicitly assumes
> that any valid ICMPv6 message is at least eight bytes long, i.e., that
> the message body is at least four bytes.
> 
> The DIS message of RPL (RFC 6550 section 6.2, from the 6LoWPAN world),
> has a minimum length of only six bytes, and is thus blocked by
> icmpv6_filter.
> 
> RFC 4443 seems to allow even a zero-sized body, making the minimum
> allowable message size four bytes.
> 
> Signed-off-by: Werner Almesberger <werner@...esberger.net>

Applied, thanks Werner.
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