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-rw-r--r--net/xfrm/xfrm_policy.c42
1 files changed, 24 insertions, 18 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 8cafb3c0a4ac..a2e531bf4f97 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1787,19 +1787,23 @@ void xfrm_policy_cache_flush(void)
put_online_cpus();
}
-static bool xfrm_pol_dead(struct xfrm_dst *xdst)
+static bool xfrm_xdst_can_reuse(struct xfrm_dst *xdst,
+ struct xfrm_state * const xfrm[],
+ int num)
{
- unsigned int num_pols = xdst->num_pols;
- unsigned int pol_dead = 0, i;
+ const struct dst_entry *dst = &xdst->u.dst;
+ int i;
- for (i = 0; i < num_pols; i++)
- pol_dead |= xdst->pols[i]->walk.dead;
+ if (xdst->num_xfrms != num)
+ return false;
- /* Mark DST_OBSOLETE_DEAD to fail the next xfrm_dst_check() */
- if (pol_dead)
- xdst->u.dst.obsolete = DST_OBSOLETE_DEAD;
+ for (i = 0; i < num; i++) {
+ if (!dst || dst->xfrm != xfrm[i])
+ return false;
+ dst = dst->child;
+ }
- return pol_dead;
+ return xfrm_bundle_ok(xdst);
}
static struct xfrm_dst *
@@ -1813,26 +1817,28 @@ xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
struct dst_entry *dst;
int err;
+ /* Try to instantiate a bundle */
+ err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
+ if (err <= 0) {
+ if (err != 0 && err != -EAGAIN)
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
+ return ERR_PTR(err);
+ }
+
xdst = this_cpu_read(xfrm_last_dst);
if (xdst &&
xdst->u.dst.dev == dst_orig->dev &&
xdst->num_pols == num_pols &&
- !xfrm_pol_dead(xdst) &&
memcmp(xdst->pols, pols,
sizeof(struct xfrm_policy *) * num_pols) == 0 &&
- xfrm_bundle_ok(xdst)) {
+ xfrm_xdst_can_reuse(xdst, xfrm, err)) {
dst_hold(&xdst->u.dst);
+ while (err > 0)
+ xfrm_state_put(xfrm[--err]);
return xdst;
}
old = xdst;
- /* Try to instantiate a bundle */
- err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
- if (err <= 0) {
- if (err != 0 && err != -EAGAIN)
- XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
- return ERR_PTR(err);
- }
dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
if (IS_ERR(dst)) {