netlink: introduce netlink.h

* netlink.h: New file.
* Makefile.am (strace_SOURCES): Add it.
* netlink_sock_diag.c: Include "netlink.h",
remove <sys/socket.h> and <linux/netlink.h>.
* netlink.c: Likewise.
(NLMSG_HDRLEN): Move to netlink.h.
* tests/netlink_protocol.c: Replace <linux/netlink.h> with "netlink.h".
* tests/netlink_sock_diag.c: Likewise.

Makefile.am

@@ -173,6 +173,7 @@ strace_SOURCES =	\
 	native_defs.h	\
 	net.c		\
 	netlink.c       \
+	netlink.h	\
 	netlink_sock_diag.c \
 	nsfs.c          \
 	nsfs.h          \

netlink.c

@@ -28,9 +28,8 @@
  */
 
 #include "defs.h"
-#include <sys/socket.h>
+#include "netlink.h"
 #include <linux/audit.h>
-#include <linux/netlink.h>
 #include <linux/rtnetlink.h>
 #include <linux/xfrm.h>
 #include "xlat/netlink_flags.h"
@@ -46,9 +45,6 @@
 #include "xlat/nl_sock_diag_types.h"
 #include "xlat/nl_xfrm_types.h"
 
-#undef NLMSG_HDRLEN
-#define NLMSG_HDRLEN NLMSG_ALIGN(sizeof(struct nlmsghdr))
-
 /*
  * Fetch a struct nlmsghdr from the given address.
  */

netlink.h

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
+ * Copyright (c) 2017 The strace developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef STRACE_NETLINK_H
+#define STRACE_NETLINK_H
+
+#include <sys/socket.h>
+#include <linux/netlink.h>
+
+#undef NLMSG_HDRLEN
+#define NLMSG_HDRLEN ((unsigned int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
+
+#ifndef NLMSG_MIN_TYPE
+# define NLMSG_MIN_TYPE		0x10
+#endif
+
+#ifndef NLA_ALIGN
+# define NLA_ALIGN(len) (((len) + 3) & ~3)
+#endif
+
+#undef NLA_HDRLEN
+#define NLA_HDRLEN ((unsigned int) NLA_ALIGN(sizeof(struct nlattr)))
+
+#ifndef NLA_TYPE_MASK
+# define NLA_F_NESTED		(1 << 15)
+# define NLA_F_NET_BYTEORDER	(1 << 14)
+# define NLA_TYPE_MASK		~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
+#endif
+
+#endif /* !STRACE_NETLINK_H */

netlink_sock_diag.c

@@ -28,11 +28,10 @@
  */
 
 #include "defs.h"
+#include "netlink.h"
 
-#include <sys/socket.h>
 #include <arpa/inet.h>
 #include <linux/inet_diag.h>
-#include <linux/netlink.h>
 #include <linux/netlink_diag.h>
 #include <linux/packet_diag.h>
 #ifdef AF_SMC

tests/netlink_protocol.c

@@ -32,13 +32,13 @@
 
 #ifdef HAVE_SYS_XATTR_H
 
+# include "netlink.h"
 # include <stdio.h>
 # include <stdlib.h>
 # include <string.h>
 # include <unistd.h>
 # include <sys/xattr.h>
 # include <netinet/in.h>
-# include <linux/netlink.h>
 # include <linux/sock_diag.h>
 # include <linux/netlink_diag.h>
 

tests/netlink_sock_diag.c

@@ -28,6 +28,7 @@
  */
 
 #include "tests.h"
+#include "netlink.h"
 #include <stdio.h>
 #include <string.h>
 #include <stdint.h>
@@ -37,7 +38,6 @@
 #include <netinet/tcp.h>
 #include <linux/if_ether.h>
 #include <linux/inet_diag.h>
-#include <linux/netlink.h>
 #include <linux/netlink_diag.h>
 #include <linux/packet_diag.h>
 #ifdef AF_SMC