[PATCH iproute2] Fix compilation with kernel headers < 3.4

[Serhey Popovych <serhe.popovych@gmail.com>]

Since commit 596b1c94aa38e21b7a8c8562e8b61ccb744255d2, iproute2 uses types
__kernel_long_t and __kernel_ulong_t but does not provide internal
definitions for it.

This means that compilation using kernel headers that are older than 3.4
(where these types were added) will fail. This situation may be uncommon for
native compilation, but not uncommon for cross compilation where the
toolchains may be a bit older.

Provide the necessary types internally if not provided by the kernel
headers to fix compilation in such cases.

Co-Developed-by: Serhii Popovych <serhe.popovych@gmail.com>
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com>
---
 include/linux/sysinfo.h |   14 ++++++++++++++
 misc/ss.c               |   10 ++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 include/linux/sysinfo.h

diff --git a/include/linux/sysinfo.h b/include/linux/sysinfo.h
new file mode 100644
index 0000000..766de8d
--- /dev/null
+++ b/include/linux/sysinfo.h
@@ -0,0 +1,14 @@
+#ifndef _SYSINFO_COMPAT_H
+#define _SYSINFO_COMPAT_H
+
+/* In case the kernel header asm/posix_types.h is too old (< 3.4) to provide
+ * __kernel_long_t, provide it here
+ */
+#ifndef __kernel_long_t
+typedef long		__kernel_long_t;
+typedef unsigned long	__kernel_ulong_t;
+#endif
+
+#include_next <linux/sysinfo.h>
+
+#endif /* _SYSINFO_COMPAT_H */
diff --git a/misc/ss.c b/misc/ss.c
index e047f9c..de5a673 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -46,6 +46,16 @@
 #include <linux/sctp.h>
 #include <linux/vm_sockets_diag.h>
 
+#ifndef AF_VSOCK
+#define AF_VSOCK	40
+#if defined(AF_MAX) && AF_MAX < 41
+#undef AF_MAX
+#endif
+#ifndef AF_MAX
+#define AF_MAX		41
+#endif /* AF_MAX */
+#endif /* AF_VSOCK */
+
 #define MAGIC_SEQ 123456
 #define BUF_CHUNK (1024 * 1024)
 #define LEN_ALIGN(x) (((x) + 1) & ~1)
-- 
1.7.10.4