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