netdev - Socket filter access to hatype

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Message-ID: <20100420220029.GN19334@cel.leo>
Date:	Tue, 20 Apr 2010 23:00:29 +0100
From:	Paul LeoNerd Evans <leonerd@...nerd.org.uk>
To:	netdev@...r.kernel.org
Subject: Socket filter access to hatype

When capturing packets on a PF_PACKET/SOCK_RAW socket bound to all
interfaces, there doesn't appear to be a way for the filter program to
actually find out the underlying hardware type the packet was captured
on, such as is reported by the sll_hatype field of the struct sockaddr_ll
when the packet is sent up to userland.

Unless I've managed to miss a trick somewhere, this would seem to put a
fairly fundamental blocker on actually being able to filter in such
packets. Granted there's the SKF_OFF_NET area to inspect at the e.g. IPv4
level, but this makes it impossible to do anything on e.g. the Ethernet
level.

See attached for a patch to add an SKF_AD_HATYPE field, up among the
other special access fields around SKF_AD_OFF.

-- 
Paul "LeoNerd" Evans

leonerd@...nerd.org.uk
ICQ# 4135350       |  Registered Linux# 179460
http://www.leonerd.org.uk/

View attachment "linux-SKF_AD_HATYPE.patch" of type "text/x-patch" (924 bytes)

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