tree 1613607168baa8b654c300895cd7d0ffb6f18581
parent f034b5d4efdfe0fb9e2a1ce1d95fa7914f24de49
author David S. Miller <davem@sunset.davemloft.net> 1156414689 -0700
committer David S. Miller <davem@sunset.davemloft.net> 1158962922 -0700

[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>