[NET]: Clone the sk_buff 'iif' field in __skb_clone()

Both NetLabel and SELinux (other LSMs may grow to use it as well) rely
on the 'iif' field to determine the receiving network interface of
inbound packets.  Unfortunately, at present this field is not
preserved across a skb clone operation which can lead to garbage
values if the cloned skb is sent back through the network stack.  This
patch corrects this problem by properly copying the 'iif' field in
__skb_clone() and removing the 'iif' field assignment from
skb_act_clone() since it is no longer needed.

Also, while we are here, put the assignments in the same order as the
offsets to reduce cacheline bounces.
Signed-off-by: NPaul Moore <paul.moore@hp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/sch_generic.h

@@ -325,7 +325,6 @@ static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
 		n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
 		n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
 		n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
-		n->iif = skb->iif;
 	}
 	return n;
 }

net/core/skbuff.c

@@ -416,16 +416,17 @@ static struct sk_buff *__skb_clone(struct sk_buff *n, struct sk_buff *skb)
 	C(len);
 	C(data_len);
 	C(mac_len);
-	n->cloned = 1;
 	n->hdr_len = skb->nohdr ? skb_headroom(skb) : skb->hdr_len;
+	n->cloned = 1;
 	n->nohdr = 0;
 	n->destructor = NULL;
-	C(truesize);
-	atomic_set(&n->users, 1);
-	C(head);
-	C(data);
+	C(iif);
 	C(tail);
 	C(end);
+	C(head);
+	C(data);
+	C(truesize);
+	atomic_set(&n->users, 1);
 
 	atomic_inc(&(skb_shinfo(skb)->dataref));
 	skb->cloned = 1;