diff options
| author | David S. Miller <davem@sunset.davemloft.net> | 2006-08-24 03:18:09 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-09-22 15:08:42 -0700 |
| commit | 9d4a706d852411154d0c91b9ffb3bec68b94b25c (patch) | |
| tree | 1613607168baa8b654c300895cd7d0ffb6f18581 /net/xfrm | |
| parent | f034b5d4efdfe0fb9e2a1ce1d95fa7914f24de49 (diff) | |
[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>
Diffstat (limited to 'net/xfrm')
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 2 | ||||
| -rw-r--r-- | net/xfrm/xfrm_state.c | 3 |
2 files changed, 5 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 1732159ffd01..7fc6944ee36f 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1536,6 +1536,8 @@ int xfrm_bundle_ok(struct xfrm_dst *first, struct flowi *fl, int family, int str return 0; if (dst->xfrm->km.state != XFRM_STATE_VALID) return 0; + if (xdst->genid != dst->xfrm->genid) + return 0; if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL && !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 445263c54c94..535d43c14720 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -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); |