[IPSEC]: Perform SA switchover immediately.

When we insert a new xfrm_state which potentially
subsumes an existing one, make sure all cached
bundles are flushed so that the new SA is used
immediately.

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 19 insertions, 5 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 0db9e57013fd..54a4be6a7d26 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1014,13 +1014,12 @@ int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
 }
 EXPORT_SYMBOL(__xfrm_route_forward);
 
-/* Optimize later using cookies and generation ids. */
-
 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
 {
-        if (!stale_bundle(dst))
-                return dst;
-
+        /* If it is marked obsolete, which is how we even get here,
+         * then we have purged it from the policy bundle list and we
+         * did that for a good reason.
+         */
         return NULL;
 }
 
@@ -1104,6 +1103,16 @@ int xfrm_flush_bundles(void)
         return 0;
 }
 
+static int always_true(struct dst_entry *dst)
+{
+        return 1;
+}
+
+void xfrm_flush_all_bundles(void)
+{
+        xfrm_prune_bundles(always_true);
+}
+
 void xfrm_init_pmtu(struct dst_entry *dst)
 {
         do {
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 7cf48aa6c95b..479effc97666 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -431,6 +431,8 @@ void xfrm_state_insert(struct xfrm_state *x)
         spin_lock_bh(&xfrm_state_lock);
         __xfrm_state_insert(x);
         spin_unlock_bh(&xfrm_state_lock);
+
+        xfrm_flush_all_bundles();
 }
 EXPORT_SYMBOL(xfrm_state_insert);
 
@@ -478,6 +480,9 @@ out:
         spin_unlock_bh(&xfrm_state_lock);
         xfrm_state_put_afinfo(afinfo);
 
+        if (!err)
+                xfrm_flush_all_bundles();
+
         if (x1) {
                 xfrm_state_delete(x1);
                 xfrm_state_put(x1);