Add TCP_FASTOPEN_KEY, TCP_FASTOPEN_NO_COOKIE from Linux 4.15

[Joseph Myers]

[Proposed for once the release changes for 2.27, and the post-release 
changes opening master for development for 2.28, have been committed.]

This patch adds the TCP_FASTOPEN_KEY and TCP_FASTOPEN_NO_COOKIE macros
from Linux 4.15 to sysdeps/gnu/netinet/tcp.h.

Tested for x86_64.

2018-02-01  Joseph Myers  <joseph@codesourcery.com>

	* sysdeps/gnu/netinet/tcp.h (TCP_FASTOPEN_KEY): New macro.
	(TCP_FASTOPEN_NO_COOKIE): Likewise.

diff --git a/sysdeps/gnu/netinet/tcp.h b/sysdeps/gnu/netinet/tcp.h
index 75973f0..44a72e9 100644
--- a/sysdeps/gnu/netinet/tcp.h
+++ b/sysdeps/gnu/netinet/tcp.h
@@ -73,6 +73,8 @@
 #define TCP_FASTOPEN_CONNECT	 30 /* Attempt FastOpen with connect.  */
 #define TCP_ULP			 31 /* Attach a ULP to a TCP connection.  */
 #define TCP_MD5SIG_EXT		 32 /* TCP MD5 Signature with extensions.  */
+#define TCP_FASTOPEN_KEY	 33 /* Set the key for Fast Open (cookie).  */
+#define TCP_FASTOPEN_NO_COOKIE	 34 /* Enable TFO without a TFO cookie.  */
 
 #ifdef __USE_MISC
 # include <sys/types.h>

-- 
Joseph S. Myers
joseph@codesourcery.com