Differential D20655 Diff 65132 head/share/man/man4/tcp.4

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head/share/man/man4/tcp.4

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	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT			.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY			.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF			.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.			.\" SUCH DAMAGE.
	.\"			.\"
	.\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93			.\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93
	.\" $FreeBSD$			.\" $FreeBSD$
	.\"			.\"
	.Dd December 1, 2019			.Dd December 2, 2019
	.Dt TCP 4			.Dt TCP 4
	.Os			.Os
	.Sh NAME			.Sh NAME
	.Nm tcp			.Nm tcp
	.Nd Internet Transmission Control Protocol			.Nd Internet Transmission Control Protocol
	.Sh SYNOPSIS			.Sh SYNOPSIS
	.In sys/types.h			.In sys/types.h
	.In sys/socket.h			.In sys/socket.h
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	administrator to add a tcp-md5 key entry to the system's security			administrator to add a tcp-md5 key entry to the system's security
	associations database (SADB) using the			associations database (SADB) using the
	.Xr setkey 8			.Xr setkey 8
	utility.			utility.
	This entry can only be specified on a per-host basis at this time.			This entry can only be specified on a per-host basis at this time.
	.Pp			.Pp
	If an SADB entry cannot be found for the destination,			If an SADB entry cannot be found for the destination,
	the system does not send any outgoing segments and drops any inbound segments.			the system does not send any outgoing segments and drops any inbound segments.
				.It Dv TCP_STATS
				Manage collection of connection level statistics using the
				.Xr stats 3
				framework.
	.Pp			.Pp
	Each dropped segment is taken into account in the TCP protocol statistics.			Each dropped segment is taken into account in the TCP protocol statistics.
	.It Dv TCP_TXTLS_ENABLE			.It Dv TCP_TXTLS_ENABLE
	Enable in-kernel Transport Layer Security (TLS) for data written to this			Enable in-kernel Transport Layer Security (TLS) for data written to this
	socket.			socket.
	The			The
	.Vt struct tls_so_enable			.Vt struct tls_so_enable
	argument defines the encryption and authentication algorithms and keys			argument defines the encryption and authentication algorithms and keys
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	Default is false.			Default is false.
	.It Va insecure_syn			.It Va insecure_syn
	Use criteria defined in RFC793 instead of RFC5961 for accepting SYN segments.			Use criteria defined in RFC793 instead of RFC5961 for accepting SYN segments.
	Default is false.			Default is false.
	.It Va ts_offset_per_conn			.It Va ts_offset_per_conn
	When initializing the TCP timestamps, use a per connection offset instead of a			When initializing the TCP timestamps, use a per connection offset instead of a
	per host pair offset.			per host pair offset.
	Default is to use per connection offsets as recommended in RFC 7323.			Default is to use per connection offsets as recommended in RFC 7323.
				.It Va perconn_stats_enable
				Controls the default collection of statistics for all connections using the
				.Xr stats 3
				framework.
				0 disables, 1 enables, 2 enables random sampling across log id connection
				groups with all connections in a group receiving the same setting.
				.It Va perconn_stats_sample_rates
				A CSV list of template_spec=percent key-value pairs which controls the per
				template sampling rates when
				.Xr stats 3
				sampling is enabled.
	.El			.El
	.Sh ERRORS			.Sh ERRORS
	A socket operation may fail with one of the following errors returned:			A socket operation may fail with one of the following errors returned:
	.Bl -tag -width Er			.Bl -tag -width Er
	.It Bq Er EISCONN			.It Bq Er EISCONN
	when trying to establish a connection on a socket which			when trying to establish a connection on a socket which
	already has one;			already has one;
	.It Bo Er ENOBUFS Bc or Bo Er ENOMEM Bc			.It Bo Er ENOBUFS Bc or Bo Er ENOMEM Bc
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	.It Bq Er EINVAL			.It Bq Er EINVAL
	when trying to change TCP function blocks at an invalid point in the session;			when trying to change TCP function blocks at an invalid point in the session;
	.It Bq Er ENOENT			.It Bq Er ENOENT
	when trying to use a TCP function block that is not available;			when trying to use a TCP function block that is not available;
	.El			.El
	.Sh SEE ALSO			.Sh SEE ALSO
	.Xr getsockopt 2 ,			.Xr getsockopt 2 ,
	.Xr socket 2 ,			.Xr socket 2 ,
				.Xr stats 3 ,
	.Xr sysctl 3 ,			.Xr sysctl 3 ,
	.Xr blackhole 4 ,			.Xr blackhole 4 ,
	.Xr inet 4 ,			.Xr inet 4 ,
	.Xr intro 4 ,			.Xr intro 4 ,
	.Xr ip 4 ,			.Xr ip 4 ,
	.Xr mod_cc 4 ,			.Xr mod_cc 4 ,
	.Xr siftr 4 ,			.Xr siftr 4 ,
	.Xr syncache 4 ,			.Xr syncache 4 ,
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