[NET_CLS_ACT]: Introduce skb_act_clone

Reworked skb_clone looks uglier with the single ifdef
CONFIG_NET_CLS_ACT This patch introduces skb_act_clone which will
replace skb_clone in tc actions
Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sch_generic.h

@@ -316,4 +316,19 @@ static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
 	return rtab->data[slot];
 }
 
+#ifdef CONFIG_NET_CLS_ACT
+static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
+{
+	struct sk_buff *n = skb_clone(skb, gfp_mask);
+
+	if (n) {
+		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;
+}
+#endif
+
 #endif