| .. SPDX-License-Identifier: GPL-2.0 |
| |
| ===================== |
| MPTCP Sysfs variables |
| ===================== |
| |
| /proc/sys/net/mptcp/* Variables |
| =============================== |
| |
| 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) |
| |
| 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. |
| |
| The default value matches TCP_RTO_MAX. This is a per-namespace |
| sysctl. |
| |
| Default: 120 |
| |
| 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 |
| |
| 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 |
| |
| 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 |
| |
| 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 |