[IPV4]: Split arp_send into arp_create and arp_xmit, export them.

include/net/arp.h

@@ -5,6 +5,8 @@
 #include <linux/if_arp.h>
 #include <net/neighbour.h>
 
+#define HAVE_ARP_CREATE
+
 extern struct neigh_table arp_tbl;
 
 extern void	arp_init(void);
@@ -19,6 +21,12 @@ extern int	arp_bind_neighbour(struct dst_entry *dst);
 extern int	arp_mc_map(u32 addr, u8 *haddr, struct net_device *dev, int dir);
 extern void	arp_ifdown(struct net_device *dev);
 
+extern struct sk_buff *arp_create(int type, int ptype, u32 dest_ip,
+				  struct net_device *dev, u32 src_ip,
+				  unsigned char *dest_hw, unsigned char *src_hw,
+				  unsigned char *target_hw);
+extern void arp_xmit(struct sk_buff *skb);
+
 extern struct neigh_ops arp_broken_ops;
 
 #endif	/* _ARP_H */

net/ipv4/arp.c

@@ -67,6 +67,10 @@
  *					now it is in net/core/neighbour.c.
  *		Krzysztof Halasa:	Added Frame Relay ARP support.
  *		Arnaldo C. Melo :	convert /proc/net/arp to seq_file
+ *		Shmulik Hen:		Split arp_send to arp_create and
+ *					arp_xmit so intermediate drivers like
+ *					bonding can change the skb before
+ *					sending (e.g. insert 8021q tag).
  */
 
 #include <linux/module.h>
@@ -487,26 +491,18 @@ static inline int arp_fwd_proxy(struct in_device *in_dev, struct rtable *rt)
  */
 
 /*
- *	Create and send an arp packet. If (dest_hw == NULL), we create a broadcast
+ *	Create an arp packet. If (dest_hw == NULL), we create a broadcast
  *	message.
  */
-
-void arp_send(int type, int ptype, u32 dest_ip, 
-	      struct net_device *dev, u32 src_ip, 
-	      unsigned char *dest_hw, unsigned char *src_hw,
-	      unsigned char *target_hw)
+struct sk_buff *arp_create(int type, int ptype, u32 dest_ip,
+			   struct net_device *dev, u32 src_ip,
+			   unsigned char *dest_hw, unsigned char *src_hw,
+			   unsigned char *target_hw)
 {
 	struct sk_buff *skb;
 	struct arphdr *arp;
 	unsigned char *arp_ptr;
 
-	/*
-	 *	No arp on this interface.
-	 */
-	
-	if (dev->flags&IFF_NOARP)
-		return;
-
 	/*
 	 *	Allocate a buffer
 	 */
@@ -514,7 +510,7 @@ void arp_send(int type, int ptype, u32 dest_ip,
 	skb = alloc_skb(sizeof(struct arphdr)+ 2*(dev->addr_len+4)
 				+ LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 	if (skb == NULL)
-		return;
+		return NULL;
 
 	skb_reserve(skb, LL_RESERVED_SPACE(dev));
 	skb->nh.raw = skb->data;
@@ -594,12 +590,46 @@ void arp_send(int type, int ptype, u32 dest_ip,
 	arp_ptr+=dev->addr_len;
 	memcpy(arp_ptr, &dest_ip, 4);
 
-	/* Send it off, maybe filter it using firewalling first.  */
-	NF_HOOK(NF_ARP, NF_ARP_OUT, skb, NULL, dev, dev_queue_xmit);
-	return;
+	return skb;
 
 out:
 	kfree_skb(skb);
+	return NULL;
+}
+
+/*
+ *	Send an arp packet.
+ */
+void arp_xmit(struct sk_buff *skb)
+{
+	/* Send it off, maybe filter it using firewalling first.  */
+	NF_HOOK(NF_ARP, NF_ARP_OUT, skb, NULL, skb->dev, dev_queue_xmit);
+}
+
+/*
+ *	Create and send an arp packet.
+ */
+void arp_send(int type, int ptype, u32 dest_ip, 
+	      struct net_device *dev, u32 src_ip, 
+	      unsigned char *dest_hw, unsigned char *src_hw,
+	      unsigned char *target_hw)
+{
+	struct sk_buff *skb;
+
+	/*
+	 *	No arp on this interface.
+	 */
+	
+	if (dev->flags&IFF_NOARP)
+		return;
+
+	skb = arp_create(type, ptype, dest_ip, dev, src_ip,
+			 dest_hw, src_hw, target_hw);
+	if (skb == NULL) {
+		return;
+	}
+
+	arp_xmit(skb);
 }
 
 static void parp_redo(struct sk_buff *skb)
@@ -1437,6 +1467,8 @@ static int __init arp_proc_init(void)
 EXPORT_SYMBOL(arp_broken_ops);
 EXPORT_SYMBOL(arp_find);
 EXPORT_SYMBOL(arp_rcv);
+EXPORT_SYMBOL(arp_create);
+EXPORT_SYMBOL(arp_xmit);
 EXPORT_SYMBOL(arp_send);
 EXPORT_SYMBOL(arp_tbl);