1.. SPDX-License-Identifier: GPL-2.0 2 3===================== 4MPTCP Sysfs variables 5===================== 6 7/proc/sys/net/mptcp/* Variables 8=============================== 9 10add_addr_timeout - INTEGER (seconds) 11 Set the timeout after which an ADD_ADDR control message will be 12 resent to an MPTCP peer that has not acknowledged a previous 13 ADD_ADDR message. 14 15 The default value matches TCP_RTO_MAX. This is a per-namespace 16 sysctl. 17 18 Default: 120 19 20allow_join_initial_addr_port - BOOLEAN 21 Allow peers to send join requests to the IP address and port number used 22 by the initial subflow if the value is 1. This controls a flag that is 23 sent to the peer at connection time, and whether such join requests are 24 accepted or denied. 25 26 Joins to addresses advertised with ADD_ADDR are not affected by this 27 value. 28 29 This is a per-namespace sysctl. 30 31 Default: 1 32 33available_schedulers - STRING 34 Shows the available schedulers choices that are registered. More packet 35 schedulers may be available, but not loaded. 36 37checksum_enabled - BOOLEAN 38 Control whether DSS checksum can be enabled. 39 40 DSS checksum can be enabled if the value is nonzero. This is a 41 per-namespace sysctl. 42 43 Default: 0 44 45close_timeout - INTEGER (seconds) 46 Set the make-after-break timeout: in absence of any close or 47 shutdown syscall, MPTCP sockets will maintain the status 48 unchanged for such time, after the last subflow removal, before 49 moving to TCP_CLOSE. 50 51 The default value matches TCP_TIMEWAIT_LEN. This is a per-namespace 52 sysctl. 53 54 Default: 60 55 56enabled - BOOLEAN 57 Control whether MPTCP sockets can be created. 58 59 MPTCP sockets can be created if the value is 1. This is a 60 per-namespace sysctl. 61 62 Default: 1 (enabled) 63 64pm_type - INTEGER 65 Set the default path manager type to use for each new MPTCP 66 socket. In-kernel path management will control subflow 67 connections and address advertisements according to 68 per-namespace values configured over the MPTCP netlink 69 API. Userspace path management puts per-MPTCP-connection subflow 70 connection decisions and address advertisements under control of 71 a privileged userspace program, at the cost of more netlink 72 traffic to propagate all of the related events and commands. 73 74 This is a per-namespace sysctl. 75 76 * 0 - In-kernel path manager 77 * 1 - Userspace path manager 78 79 Default: 0 80 81scheduler - STRING 82 Select the scheduler of your choice. 83 84 Support for selection of different schedulers. This is a per-namespace 85 sysctl. 86 87 Default: "default" 88 89stale_loss_cnt - INTEGER 90 The number of MPTCP-level retransmission intervals with no traffic and 91 pending outstanding data on a given subflow required to declare it stale. 92 The packet scheduler ignores stale subflows. 93 A low stale_loss_cnt value allows for fast active-backup switch-over, 94 an high value maximize links utilization on edge scenarios e.g. lossy 95 link with high BER or peer pausing the data processing. 96 97 This is a per-namespace sysctl. 98 99 Default: 4 100