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.
-       Default: 2
+       Default: 1
 
 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.
 
+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
@@ -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.
-       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).
@@ -524,6 +532,11 @@ tcp_thin_dupack - BOOLEAN
        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
@@ -1065,6 +1078,14 @@ accept_ra_defrtr - BOOLEAN
        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.