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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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3
net/xfrm/xfrm_state.c
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@ -53,6 +53,7 @@ static struct hlist_head *xfrm_state_byspi __read_mostly;
static unsigned int xfrm_state_hmask __read_mostly;
static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
static unsigned int xfrm_state_num;
static unsigned int xfrm_state_genid;
static inline unsigned int __xfrm4_dst_hash(xfrm_address_t *addr, unsigned int hmask)
{
@ -745,6 +746,8 @@ static void __xfrm_state_insert(struct xfrm_state *x)
{
unsigned int h = xfrm_dst_hash(&x->id.daddr, x->props.family);
x->genid = ++xfrm_state_genid;
hlist_add_head(&x->bydst, xfrm_state_bydst+h);
xfrm_state_hold(x);