net: sandbox: Refactor sandbox send function

Make the behavior of the send function reusable.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/sandbox/include/asm/eth.h b/arch/sandbox/include/asm/eth.h
index bfcd11b..3dc84f0 100644
--- a/arch/sandbox/include/asm/eth.h
+++ b/arch/sandbox/include/asm/eth.h
@@ -13,4 +13,30 @@
 
 void sandbox_eth_skip_timeout(void);
 
+/*
+ * sandbox_eth_arp_req_to_reply()
+ *
+ * Check for an arp request to be sent. If so, inject a reply
+ *
+ * @dev: device that received the packet
+ * @packet: pointer to the received pacaket buffer
+ * @len: length of received packet
+ * @return 0 if injected, -EAGAIN if not
+ */
+int sandbox_eth_arp_req_to_reply(struct udevice *dev, void *packet,
+				 unsigned int len);
+
+/*
+ * sandbox_eth_ping_req_to_reply()
+ *
+ * Check for a ping request to be sent. If so, inject a reply
+ *
+ * @dev: device that received the packet
+ * @packet: pointer to the received pacaket buffer
+ * @len: length of received packet
+ * @return 0 if injected, -EAGAIN if not
+ */
+int sandbox_eth_ping_req_to_reply(struct udevice *dev, void *packet,
+				  unsigned int len);
+
 #endif /* __ETH_H */