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 37blackhole_timeout - INTEGER (seconds) 38 Initial time period in second to disable MPTCP on active MPTCP sockets 39 when a MPTCP firewall blackhole issue happens. This time period will 40 grow exponentially when more blackhole issues get detected right after 41 MPTCP is re-enabled and will reset to the initial value when the 42 blackhole issue goes away. 43 44 0 to disable the blackhole detection. 45 46 Default: 3600 47 48checksum_enabled - BOOLEAN 49 Control whether DSS checksum can be enabled. 50 51 DSS checksum can be enabled if the value is nonzero. This is a 52 per-namespace sysctl. 53 54 Default: 0 55 56close_timeout - INTEGER (seconds) 57 Set the make-after-break timeout: in absence of any close or 58 shutdown syscall, MPTCP sockets will maintain the status 59 unchanged for such time, after the last subflow removal, before 60 moving to TCP_CLOSE. 61 62 The default value matches TCP_TIMEWAIT_LEN. This is a per-namespace 63 sysctl. 64 65 Default: 60 66 67enabled - BOOLEAN 68 Control whether MPTCP sockets can be created. 69 70 MPTCP sockets can be created if the value is 1. This is a 71 per-namespace sysctl. 72 73 Default: 1 (enabled) 74 75pm_type - INTEGER 76 Set the default path manager type to use for each new MPTCP 77 socket. In-kernel path management will control subflow 78 connections and address advertisements according to 79 per-namespace values configured over the MPTCP netlink 80 API. Userspace path management puts per-MPTCP-connection subflow 81 connection decisions and address advertisements under control of 82 a privileged userspace program, at the cost of more netlink 83 traffic to propagate all of the related events and commands. 84 85 This is a per-namespace sysctl. 86 87 * 0 - In-kernel path manager 88 * 1 - Userspace path manager 89 90 Default: 0 91 92scheduler - STRING 93 Select the scheduler of your choice. 94 95 Support for selection of different schedulers. This is a per-namespace 96 sysctl. 97 98 Default: "default" 99 100stale_loss_cnt - INTEGER 101 The number of MPTCP-level retransmission intervals with no traffic and 102 pending outstanding data on a given subflow required to declare it stale. 103 The packet scheduler ignores stale subflows. 104 A low stale_loss_cnt value allows for fast active-backup switch-over, 105 an high value maximize links utilization on edge scenarios e.g. lossy 106 link with high BER or peer pausing the data processing. 107 108 This is a per-namespace sysctl. 109 110 Default: 4 111