From: David S. Miller <davem@sunset.davemloft.net>
Date: Thu, 24 Aug 2006 10:18:09 +0000 (-0700)
Subject: [XFRM]: Add generation count to xfrm_state and xfrm_dst.
X-Git-Tag: v2.6.19-rc1~1272^2~139
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9d4a706d852411154d0c91b9ffb3bec68b94b25c;p=pandora-kernel.git

[XFRM]: Add generation count to xfrm_state and xfrm_dst.

Each xfrm_state inserted gets a new generation counter
value.  When a bundle is created, the xfrm_dst objects
get the current generation counter of the xfrm_state
they will attach to at dst->xfrm.

xfrm_bundle_ok() will return false if it sees an
xfrm_dst with a generation count different from the
generation count of the xfrm_state that dst points to.

This provides a facility by which to passively and
cheaply invalidate cached IPSEC routes during SA
database changes.

Signed-off-by: David S. Miller <davem@davemloft.net>
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