tcp: add tcp_min_snd_mss sysctl

[pandora-kernel.git] / Documentation / networking / ip-sysctl.txt

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 589f2da..5ec1ae9 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -137,7 +137,7 @@ tcp_adv_win_scale - INTEGER
        (if tcp_adv_win_scale > 0) or bytes-bytes/2^(-tcp_adv_win_scale),
        if it is <= 0.
        Possible values are [-31, 31], inclusive.
        (if tcp_adv_win_scale > 0) or bytes-bytes/2^(-tcp_adv_win_scale),
        if it is <= 0.
        Possible values are [-31, 31], inclusive.

-       Default: 2
+       Default: 1

 
 tcp_allowed_congestion_control - STRING
        Show/set the congestion control choices available to non-privileged
 
 tcp_allowed_congestion_control - STRING
        Show/set the congestion control choices available to non-privileged


@@ -160,6 +160,14 @@ tcp_base_mss - INTEGER
        Path MTU discovery (MTU probing).  If MTU probing is enabled,
        this is the initial MSS used by the connection.
 
        Path MTU discovery (MTU probing).  If MTU probing is enabled,
        this is the initial MSS used by the connection.
 

+tcp_min_snd_mss - INTEGER
+       TCP SYN and SYNACK messages usually advertise an ADVMSS option,
+       as described in RFC 1122 and RFC 6691.
+       If this ADVMSS option is smaller than tcp_min_snd_mss,
+       it is silently capped to tcp_min_snd_mss.
+
+       Default : 48 (at least 8 bytes of payload per segment)
+

 tcp_congestion_control - STRING
        Set the congestion control algorithm to be used for new
        connections. The algorithm "reno" is always available, but
 tcp_congestion_control - STRING
        Set the congestion control algorithm to be used for new
        connections. The algorithm "reno" is always available, but


@@ -397,7 +405,7 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max
        net.core.rmem_max.  Calling setsockopt() with SO_RCVBUF disables
        automatic tuning of that socket's receive buffer size, in which
        case this value is ignored.
        net.core.rmem_max.  Calling setsockopt() with SO_RCVBUF disables
        automatic tuning of that socket's receive buffer size, in which
        case this value is ignored.

-       Default: between 87380B and 4MB, depending on RAM size.
+       Default: between 87380B and 6MB, depending on RAM size.

 
 tcp_sack - BOOLEAN
        Enable select acknowledgments (SACKS).
 
 tcp_sack - BOOLEAN
        Enable select acknowledgments (SACKS).


@@ -524,6 +532,11 @@ tcp_thin_dupack - BOOLEAN
        Documentation/networking/tcp-thin.txt
        Default: 0
 
        Documentation/networking/tcp-thin.txt
        Default: 0
 

+tcp_challenge_ack_limit - INTEGER
+       Limits number of Challenge ACK sent per second, as recommended
+       in RFC 5961 (Improving TCP's Robustness to Blind In-Window Attacks)
+       Default: 100
+

 UDP variables:
 
 udp_mem - vector of 3 INTEGERs: min, pressure, max
 UDP variables:
 
 udp_mem - vector of 3 INTEGERs: min, pressure, max


@@ -1065,6 +1078,14 @@ accept_ra_defrtr - BOOLEAN
        Functional default: enabled if accept_ra is enabled.
                            disabled if accept_ra is disabled.
 
        Functional default: enabled if accept_ra is enabled.
                            disabled if accept_ra is disabled.
 

+accept_ra_min_hop_limit - INTEGER
+       Minimum hop limit Information in Router Advertisement.
+
+       Hop limit Information in Router Advertisement less than this
+       variable shall be ignored.
+
+       Default: 1
+

 accept_ra_pinfo - BOOLEAN
        Learn Prefix Information in Router Advertisement.
 
 accept_ra_pinfo - BOOLEAN
        Learn Prefix Information in Router Advertisement.