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

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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>
This commit is contained in:
David S. Miller
2006-08-24 03:18:09 -07:00
parent f034b5d4ef
commit 9d4a706d85
5 changed files with 10 additions and 0 deletions
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1
net/ipv6/xfrm6_policy.c
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@@ -149,6 +149,7 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
xdst = (struct xfrm_dst *)dst1;
xdst->route = &rt->u.dst;
xdst->genid = xfrm[i]->genid;
if (rt->rt6i_node)
xdst->route_cookie = rt->rt6i_node->fn_sernum;