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- .. SPDX-License-Identifier: GPL-2.0
- =====================
- MPTCP Sysfs variables
- =====================
- /proc/sys/net/mptcp/* Variables
- ===============================
- 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.
- Do not retransmit if set to 0.
- The default value matches TCP_RTO_MAX. This is a per-namespace
- sysctl.
- Default: 120
- 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
- available_schedulers - STRING
- Shows the available schedulers choices that are registered. More packet
- schedulers may be available, but not loaded.
- blackhole_timeout - INTEGER (seconds)
- Initial time period in second to disable MPTCP on active MPTCP sockets
- when a MPTCP firewall blackhole issue happens. This time period will
- grow exponentially when more blackhole issues get detected right after
- MPTCP is re-enabled and will reset to the initial value when the
- blackhole issue goes away.
- 0 to disable the blackhole detection.
- Default: 3600
- 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
- close_timeout - INTEGER (seconds)
- Set the make-after-break timeout: in absence of any close or
- shutdown syscall, MPTCP sockets will maintain the status
- unchanged for such time, after the last subflow removal, before
- moving to TCP_CLOSE.
- The default value matches TCP_TIMEWAIT_LEN. This is a per-namespace
- sysctl.
- Default: 60
- 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)
- 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
- scheduler - STRING
- Select the scheduler of your choice.
- Support for selection of different schedulers. This is a per-namespace
- sysctl.
- Default: "default"
- 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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