Index: head/sys/compat/linux/linux_socket.h
===================================================================
--- head/sys/compat/linux/linux_socket.h
+++ head/sys/compat/linux/linux_socket.h
@@ -170,12 +170,6 @@
 
 /* Socket defines */
 #define	LINUX_SOL_SOCKET	1
-#define	LINUX_SOL_IP		0
-#define	LINUX_SOL_TCP		6
-#define	LINUX_SOL_UDP		17
-#define	LINUX_SOL_IPV6		41
-#define	LINUX_SOL_IPX		256
-#define	LINUX_SOL_AX25		257
 
 #define	LINUX_SO_DEBUG		1
 #define	LINUX_SO_REUSEADDR	2
Index: head/sys/compat/linux/linux_socket.c
===================================================================
--- head/sys/compat/linux/linux_socket.c
+++ head/sys/compat/linux/linux_socket.c
@@ -92,10 +92,9 @@
 linux_to_bsd_sockopt_level(int level)
 {
 
-	switch (level) {
-	case LINUX_SOL_SOCKET:
+	if (level == LINUX_SOL_SOCKET)
 		return (SOL_SOCKET);
-	}
+	/* Remaining values are RFC-defined protocol numbers. */
 	return (level);
 }
 
@@ -103,10 +102,8 @@
 bsd_to_linux_sockopt_level(int level)
 {
 
-	switch (level) {
-	case SOL_SOCKET:
+	if (level == SOL_SOCKET)
 		return (LINUX_SOL_SOCKET);
-	}
 	return (level);
 }