MFC r292706:

Implementation of server-side TCP Fast Open (TFO) [RFC7413].

TFO is disabled by default in the kernel build.  See the top comment
in sys/netinet/tcp_fastopen.c for implementation particulars.

Differential Revision:	https://reviews.freebsd.org/D4350
Sponsored by:	Verisign, Inc.

1 files changed, 15 insertions, 1 deletions

diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h
index 758f2c5..cff81c5 100644
--- a/sys/netinet/tcp_var.h
+++ b/sys/netinet/tcp_var.h
@@ -213,8 +213,18 @@ struct tcpcb {
 	u_int	t_flags2;		/* More tcpcb flags storage */
 
 	uint32_t t_ispare[6];		/* 5 UTO, 1 TBD */
+#if defined(_KERNEL) && defined(TCP_RFC7413)
+	void	*t_pspare2[3];		/* 1 TCP_SIGNATURE, 2 TBD */
+	unsigned int *t_tfo_pending;	/* TCP Fast Open pending counter */
+#else
 	void	*t_pspare2[4];		/* 1 TCP_SIGNATURE, 3 TBD */
+#endif
+#if defined(_KERNEL) && defined(TCP_RFC7413)
+	uint64_t _pad[4];		/* 4 TBD (1-2 CC/RTT?) */
+	uint64_t t_tfo_cookie;		/* TCP Fast Open cookie */
+#else
 	uint64_t _pad[5];		/* 5 TBD (1-2 CC/RTT?) */
+#endif
 	uint32_t t_tsomaxsegcount;	/* TSO maximum segment count */
 	uint32_t t_tsomaxsegsize;	/* TSO maximum segment size in bytes */
 };
@@ -251,6 +261,7 @@ struct tcpcb {
 #define	TF_ECN_SND_ECE	0x10000000	/* ECN ECE in queue */
 #define	TF_CONGRECOVERY	0x20000000	/* congestion recovery mode */
 #define	TF_WASCRECOVERY	0x40000000	/* was in congestion recovery */
+#define	TF_FASTOPEN	0x80000000	/* TCP Fast Open indication */
 
 #define	IN_FASTRECOVERY(t_flags)	(t_flags & TF_FASTRECOVERY)
 #define	ENTER_FASTRECOVERY(t_flags)	t_flags |= TF_FASTRECOVERY
@@ -310,14 +321,17 @@ struct tcpopt {
 #define	TOF_TS		0x0010		/* timestamp */
 #define	TOF_SIGNATURE	0x0040		/* TCP-MD5 signature option (RFC2385) */
 #define	TOF_SACK	0x0080		/* Peer sent SACK option */
-#define	TOF_MAXOPT	0x0100
+#define	TOF_FASTOPEN	0x0100		/* TCP Fast Open (TFO) cookie */
+#define	TOF_MAXOPT	0x0200
 	u_int32_t	to_tsval;	/* new timestamp */
 	u_int32_t	to_tsecr;	/* reflected timestamp */
 	u_char		*to_sacks;	/* pointer to the first SACK blocks */
 	u_char		*to_signature;	/* pointer to the TCP-MD5 signature */
+	u_char		*to_tfo_cookie; /* pointer to the TFO cookie */
 	u_int16_t	to_mss;		/* maximum segment size */
 	u_int8_t	to_wscale;	/* window scaling */
 	u_int8_t	to_nsacks;	/* number of SACK blocks */
+	u_int8_t	to_tfo_len;	/* TFO cookie length */
 	u_int32_t	to_spare;	/* UTO */
 };