lkl: fix exported struct sockaddr definition

__kernel_sockaddr_storage is just the kernel internal storage space for
sockaddr. The userspace visible sockaddr needs to be 16 bytes, as that
is what used in several other structures visible to userpace APIs (e.g.
struct arpreq).

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>

arch/lkl/include/uapi/asm/syscalls.h

@@ -37,8 +37,6 @@ typedef __s64			s64;
 
 #define __user
 
-#define sockaddr __lkl__kernel_sockaddr_storage
-
 #include <asm/unistd.h>
 /* Temporary undefine system calls that don't have data types defined in UAPI
  * headers */
@@ -92,6 +90,14 @@ typedef __s64			s64;
 #include <asm/siginfo.h>
 #include <linux/utime.h>
 #include <asm/socket.h>
+
+/* Define data structures used in system calls that are not defined in UAPI
+ * headers */
+struct sockaddr {
+	unsigned short int sa_family;
+	char sa_data[14];
+};
+
 #include <linux/if.h>
 #define __UAPI_DEF_IN_IPPROTO	1
 #define __UAPI_DEF_IN_ADDR	1
@@ -110,8 +116,6 @@ typedef __s64			s64;
 #include <linux/virtio_net.h>
 #include <linux/virtio_ring.h>
 
-/* Define data structures used in system calls that are not defined in UAPI
- * headers */
 struct user_msghdr {
 	void		__user *msg_name;	/* ptr to socket address structure */
 	int		msg_namelen;		/* size of socket address structure */

tools/lkl/tests/net-test.c

@@ -70,7 +70,7 @@ static int test_icmp(char *str, int len)
 	inet_aton(dst, &saddr.sin_addr);
 
 	ret = lkl_sys_sendto(sock, icmp, sizeof(*icmp), 0,
-			     (struct __lkl__kernel_sockaddr_storage *)&saddr,
+			     (struct lkl_sockaddr*)&saddr,
 			     sizeof(saddr));
 	if (ret < 0) {
 		snprintf(str, len, "sendto error (%s)", strerror(errno));