net/tap: fix build for glibc < 2.24

When trying to compile with glibc < 2.24 that doesn't
support SOL_NETLINK it will cause compilation failure:

drivers/net/tap/tap_netlink.c:70:17: error:
 'SOL_NETLINK' undeclared (first use in this function)
  setsockopt(fd, SOL_NETLINK, NETLINK_EXT_ACK, &one, sizeof(one));

The glibc commits adds the SOL_NETLINK support:
https://github.com/bminor/glibc/commit/f9b437d5efce93800b51ad2a437c8b1c9

Fixes: 647909bcf34b ("net/tap: use netlink extended ack support")

Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/drivers/net/tap/tap_netlink.c b/drivers/net/tap/tap_netlink.c
index b73802b..75af340 100644 (file)
--- a/drivers/net/tap/tap_netlink.c
+++ b/drivers/net/tap/tap_netlink.c
@@ -17,6 +17,11 @@
 
 #include "tap_log.h"
 
+/* Compatibility with glibc < 2.24 */
+#ifndef SOL_NETLINK
+#define SOL_NETLINK     270
+#endif
+
 /* Must be quite large to support dumping a huge list of QDISC or filters. */
 #define BUF_SIZE (32 * 1024) /* Size of the buffer to receive kernel messages */
 #define SNDBUF_SIZE 32768 /* Send buffer size for the netlink socket */