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.. SPDX-License-Identifier: GPL-2.0
=====================
MPTCP Sysfs variables
=====================
/proc/sys/net/mptcp/* Variables
===============================
enabled - BOOLEAN
Control whether MPTCP sockets can be created.
MPTCP sockets can be created if the value is 1. This is a
per-namespace sysctl.
Default: 1 (enabled)
add_addr_timeout - INTEGER (seconds)
Set the timeout after which an ADD_ADDR control message will be
resent to an MPTCP peer that has not acknowledged a previous
ADD_ADDR message.
The default value matches TCP_RTO_MAX. This is a per-namespace
sysctl.
Default: 120
checksum_enabled - BOOLEAN
Control whether DSS checksum can be enabled.
DSS checksum can be enabled if the value is nonzero. This is a
per-namespace sysctl.
Default: 0
allow_join_initial_addr_port - BOOLEAN
Allow peers to send join requests to the IP address and port number used
by the initial subflow if the value is 1. This controls a flag that is
sent to the peer at connection time, and whether such join requests are
accepted or denied.
Joins to addresses advertised with ADD_ADDR are not affected by this
value.
This is a per-namespace sysctl.
Default: 1
pm_type - INTEGER
Set the default path manager type to use for each new MPTCP
socket. In-kernel path management will control subflow
connections and address advertisements according to
per-namespace values configured over the MPTCP netlink
API. Userspace path management puts per-MPTCP-connection subflow
connection decisions and address advertisements under control of
a privileged userspace program, at the cost of more netlink
traffic to propagate all of the related events and commands.
This is a per-namespace sysctl.
* 0 - In-kernel path manager
* 1 - Userspace path manager
Default: 0
stale_loss_cnt - INTEGER
The number of MPTCP-level retransmission intervals with no traffic and
pending outstanding data on a given subflow required to declare it stale.
The packet scheduler ignores stale subflows.
A low stale_loss_cnt value allows for fast active-backup switch-over,
an high value maximize links utilization on edge scenarios e.g. lossy
link with high BER or peer pausing the data processing.
This is a per-namespace sysctl.
Default: 4
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