[IPSEC]: Set dst->input to dst_discard

The input function should never be invoked on IPsec dst objects.  This
is because we don't apply IPsec on input until after we've made the
routing decision.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/xfrm4_policy.c

@@ -10,6 +10,7 @@
 
 #include <linux/compiler.h>
 #include <linux/inetdevice.h>
+#include <net/dst.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
 
@@ -167,7 +168,7 @@ __xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
 		dst_prev->trailer_len	= trailer_len;
 		memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
 
-		dst_prev->input		= rt->u.dst.input;
+		dst_prev->input = dst_discard;
 		dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
 		if (rt0->peer)
 			atomic_inc(&rt0->peer->refcnt);

net/ipv6/xfrm6_policy.c

@@ -14,6 +14,7 @@
 #include <linux/compiler.h>
 #include <linux/netdevice.h>
 #include <net/addrconf.h>
+#include <net/dst.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
 #include <net/ipv6.h>
@@ -214,7 +215,7 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
 		dst_prev->trailer_len	= trailer_len;
 		memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
 
-		dst_prev->input		= rt->u.dst.input;
+		dst_prev->input = dst_discard;
 		dst_prev->output = dst_prev->xfrm->outer_mode->afinfo->output;
 		/* Sheit... I remember I did this right. Apparently,
 		 * it was magically lost, so this code needs audit */