diff options
| author | jtl <jtl@FreeBSD.org> | 2016-06-28 13:37:01 +0000 |
|---|---|---|
| committer | jtl <jtl@FreeBSD.org> | 2016-06-28 13:37:01 +0000 |
| commit | bbaee6454fe08d2a791576177149a54d980569d5 (patch) | |
| tree | a337c7b411f726b37b98bb60f23b450701d6fca5 /share/man/man4/tcp.4 | |
| parent | 96d5d9cf5de60ade43c054d2cae374fd3e7b8054 (diff) | |
| download | FreeBSD-src-bbaee6454fe08d2a791576177149a54d980569d5.zip FreeBSD-src-bbaee6454fe08d2a791576177149a54d980569d5.tar.gz | |
Document support for alternate TCP stacks.
Differential Revision: https://reviews.freebsd.org/D6940
Reviewed by: hiren
Approved by: re (gjb)
Sponsored by: Juniper Networks
Diffstat (limited to 'share/man/man4/tcp.4')
| -rw-r--r-- | share/man/man4/tcp.4 | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4 index d02ff55..f275a4d 100644 --- a/share/man/man4/tcp.4 +++ b/share/man/man4/tcp.4 @@ -34,7 +34,7 @@ .\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93 .\" $FreeBSD$ .\" -.Dd May 19, 2016 +.Dd June 28, 2016 .Dt TCP 4 .Os .Sh NAME @@ -119,7 +119,7 @@ supports a number of socket options which can be set with .Xr setsockopt 2 and tested with .Xr getsockopt 2 : -.Bl -tag -width ".Dv TCP_CONGESTION" +.Bl -tag -width ".Dv TCP_FUNCTION_BLK" .It Dv TCP_INFO Information about a socket's underlying TCP session may be retrieved by passing the read-only option @@ -148,6 +148,20 @@ connection. See .Xr mod_cc 4 for details. +.It Dv TCP_FUNCTION_BLK +Select or query the set of functions that TCP will use for this connection. +This allows a user to select an alternate TCP stack. +The alternate TCP stack must already be loaded in the kernel. +To list the available TCP stacks, see +.Va functions_available +in the +.Sx MIB Variables +section further down. +To list the default TCP stack, see +.Va functions_default +in the +.Sx MIB Variables +section. .It Dv TCP_KEEPINIT This .Xr setsockopt 2 @@ -568,6 +582,10 @@ Number of times default MSS was used in an attempt to downshift. .It Va pmtud_blackhole_failed Number of connections for which retransmits continued even after MSS downshift. +.It Va functions_available +List of available TCP function blocks (TCP stacks). +.It Va functions_default +The default TCP function block (TCP stack). .El .Sh ERRORS A socket operation may fail with one of the following errors returned: @@ -599,6 +617,10 @@ exists; .It Bq Er EAFNOSUPPORT when an attempt is made to bind or connect a socket to a multicast address. +.It Bq Er EINVAL +when trying to change TCP function blocks at an invalid point in the session; +.It Bq Er ENOENT +when trying to use a TCP function block that is not available; .El .Sh SEE ALSO .Xr getsockopt 2 , |
