netdev - Re: IPV6 loopback bound socket succeeds connecting to remote host

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Message-ID: <4D0EF840.2020108@cn.fujitsu.com>
Date:	Mon, 20 Dec 2010 14:31:28 +0800
From:	Shan Wei <shanwei@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	albertpretorius@...oo.co.uk, netdev@...r.kernel.org,
	yoshfuji@...ux-ipv6.org, pekkas@...core.fi, jmorris@...ei.org
Subject: Re: IPV6 loopback bound socket succeeds connecting to remote host

David Miller wrote, at 12/17/2010 04:18 AM:
> Your approach will only modify socket based route handling, it will
> not handle the ipv6 forwarding case which as per the quoted RFC
> sections must be handled too.

For the ipv6 forwarding case, we have done the check in ip6_forward().

 493                 int addrtype = ipv6_addr_type(&hdr->saddr);
 494 
 495                 /* This check is security critical. */
 496                 if (addrtype == IPV6_ADDR_ANY ||
 497                     addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK))
 498                         goto error;


-- 
Best Regards
-----
Shan Wei
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