Revert "xfrm: Accept ESP packets regardless of UDP encapsulation mode"

This reverts commit e061b165c7f4ec5e2e160d990b49011b5b6e5c6a.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 65bcf09251ef..b4a13178fb40 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -167,6 +167,11 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
                         goto drop_unlock;
                 }
 
+                if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
+                        XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
+                        goto drop_unlock;
+                }
+
                 if (x->props.replay_window && xfrm_replay_check(x, skb, seq)) {
                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
                         goto drop_unlock;