efi_loader: efi_net: add EFI_IP4_CONFIG2_PROTOCOL

Add an implementation of the EFI_IP4_CONFIG2_PROTOCOL. The protocol
is attached to the handle of the efi network device. This is the same
handle where snp and pxe are attached to.

Signed-off-by: Adriano Cordova <adrianox@gmail.com>
diff --git a/lib/efi_loader/efi_net.c b/lib/efi_loader/efi_net.c
index 368f62c..916c159 100644
--- a/lib/efi_loader/efi_net.c
+++ b/lib/efi_loader/efi_net.c
@@ -60,11 +60,12 @@
 /**
  * struct efi_net_obj - EFI object representing a network interface
  *
- * @header:	EFI object header
- * @net:	simple network protocol interface
- * @net_mode:	status of the network interface
- * @pxe:	PXE base code protocol interface
- * @pxe_mode:	status of the PXE base code protocol
+ * @header:			EFI object header
+ * @net:			simple network protocol interface
+ * @net_mode:			status of the network interface
+ * @pxe:			PXE base code protocol interface
+ * @pxe_mode:			status of the PXE base code protocol
+ * @ip4_config2:		IP4 Config2 protocol interface
  */
 struct efi_net_obj {
 	struct efi_object header;
@@ -72,6 +73,9 @@
 	struct efi_simple_network_mode net_mode;
 	struct efi_pxe_base_code_protocol pxe;
 	struct efi_pxe_mode pxe_mode;
+#if IS_ENABLED(CONFIG_EFI_IP4_CONFIG2_PROTOCOL)
+	struct efi_ip4_config2_protocol ip4_config2;
+#endif
 };
 
 /*
@@ -999,6 +1003,12 @@
 		return r;
 	}
 
+#if IS_ENABLED(CONFIG_EFI_IP4_CONFIG2_PROTOCOL)
+	r = efi_ipconfig_register(&netobj->header, &netobj->ip4_config2);
+	if (r != EFI_SUCCESS)
+		goto failure_to_add_protocol;
+#endif
+
 	return EFI_SUCCESS;
 failure_to_add_protocol:
 	printf("ERROR: Failure to add protocol\n");