Document new (2.6.33) TCPCT sysctl and socket option. (already have kernel Documentation/networking/ip-sysctl.txt) Signed-off-by: William.Allen.Simpson@xxxxxxxxx --- man7/tcp.7 | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/man7/tcp.7 b/man7/tcp.7 index 9bdf968..b6a13de 100644 --- a/man7/tcp.7 +++ b/man7/tcp.7 @@ -303,6 +303,16 @@ The algorithm "reno" is always available, but additional choices may be available depending on kernel configuration. The default value for this file is set as part of kernel configuration. .TP +.IR tcp_cookie_size " (integer; default: 0 (disabled); since Linux 2.6.33)" +.\" The following is from 2.6.33-rc1: Documentation/networking/ip-sysctl.txt +Default size of TCP Cookie Transactions (TCPCT) option, +that may be overridden +by the TCP_COOKIE_TRANSACTIONS socket option. +Values greater than the maximum (16) are interpreted as the maximum. +Values greater than zero and less than the minimum (8) are interpreted +as the minimum. +Odd values are interpreted as the next even value. +.TP .IR tcp_dma_copybreak " (integer; default: 4096; since Linux 2.6.24)" Lower limit, in bytes, of the size of socket reads that will be offloaded to a DMA copy engine, if one is present in the system @@ -822,6 +832,51 @@ For more information see .BR ip (7). .\" FIXME Document TCP_CONGESTION (new in 2.6.13) .TP +.BR TCP_COOKIE_TRANSACTIONS " (since Linux 2.6.33)" +If defined, +this option can be used to override the system-wide setting in the file +.I /proc/sys/net/ipv4/tcp_cookie_size +for this socket. +Passes \fIstruct tcp_cookie_transactions\fP +as defined in the file +.IR /usr/include/linux/tcp.h . +Intended to be portable. +.RS +.TP +.B tcpct_cookie_desired +Send the Cookie option with the <SYN> on a per socket basis. +Values: 0 (default), 8, 10, 12, 14, 16 +.TP +.B tcpct_s_data_desired +The maximum amount of data transmitted +with the <SYN> or <SYN,ACK(SYN)> +on a per socket basis. +Wait for data before sending. +.TP +.B tcpct_used +Alternatively, +send a constant data string +with the <SYN> or <SYN,ACK(SYN)> +on a per socket basis. +On receipt, +returns cookie(s) exchanged. +.TP +.B TCP_COOKIE_IN_ALWAYS +Silently discard any incoming <SYN> that is missing +the Cookie option on a per socket basis. +Default: off. +.TP +.B TCP_COOKIE_OUT_NEVER +Refuse to send (override) +the Cookie option on a per socket basis. +Default: off. +.TP +.B TCP_EXTEND_TIMESTAMP +If defined, +may also send 64-bit timestamps extension. +Default: off. +.RE +.TP .BR TCP_CORK " (since Linux 2.2)" .\" precisely: since 2.1.127 If set, don't send out partial frames. -- 1.6.3.3
