Update netinet/tcp.h from Linux 4.13

[Dmitry V. Levin]

On Wed, Sep 06, 2017 at 09:01:34PM +0000, Joseph Myers wrote:
> This patch updates sysdeps/gnu/netinet/tcp.h to include new
> definitions from include/uapi/linux/tcp.h in Linux 4.13.
> 
> Tested for x86_64.
> 
> 2017-09-06  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* sysdeps/gnu/netinet/tcp.h (TCP_ULP): New macro.
> 	(TCP_MD5SIG_EXT): Likewise.
> 	(TCP_MD5SIG_FLAG_PREFIX): Likewise.
> 	(struct tcp_md5sig): Replace __tcpm_pad1 by tcpm_flags and
> 	tcpm_prefixlen.  Rename __tcpm_pad2 to __tcpm_pad.
> 
> diff --git a/sysdeps/gnu/netinet/tcp.h b/sysdeps/gnu/netinet/tcp.h
> index af94b8e..75973f0 100644
> --- a/sysdeps/gnu/netinet/tcp.h
> +++ b/sysdeps/gnu/netinet/tcp.h
> @@ -71,6 +71,8 @@
>  				       connection.  */
>  #define TCP_REPAIR_WINDOW	 29 /* Get/set window parameters.  */
>  #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.  */
>  
>  #ifdef __USE_MISC
>  # include <sys/types.h>
> @@ -257,12 +259,16 @@ struct tcp_info
>  /* For TCP_MD5SIG socket option.  */
>  #define TCP_MD5SIG_MAXKEYLEN	80
>  
> +/* tcp_md5sig extension flags for TCP_MD5SIG_EXT.  */
> +#define TCP_MD5SIG_FLAG_PREFIX	1 /* Address prefix length.  */
> +
>  struct tcp_md5sig
>  {
>    struct sockaddr_storage tcpm_addr;		/* Address associated.  */
> -  uint16_t	__tcpm_pad1;			/* Zero.  */
> +  uint8_t	tcpm_flags;			/* Extension flags.  */
> +  uint8_t	tcpm_prefixlen;			/* Address prefix.  */
>    uint16_t	tcpm_keylen;			/* Key length.  */
> -  uint32_t	__tcpm_pad2;			/* Zero.  */
> +  uint32_t	__tcpm_pad;			/* Zero.  */
>    uint8_t	tcpm_key[TCP_MD5SIG_MAXKEYLEN];	/* Key (binary).  */
>  };

Looks OK


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