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