diff options
| -rw-r--r-- | Documentation/networking/index.rst | 1 | ||||
| -rw-r--r-- | Documentation/networking/proc_net_tcp.rst (renamed from Documentation/networking/proc_net_tcp.txt) | 23 |
2 files changed, 17 insertions, 7 deletions
diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst index f89535871481..0da7eb0ec85a 100644 --- a/Documentation/networking/index.rst +++ b/Documentation/networking/index.rst @@ -94,6 +94,7 @@ Contents: pktgen plip ppp_generic + proc_net_tcp .. only:: subproject and html diff --git a/Documentation/networking/proc_net_tcp.txt b/Documentation/networking/proc_net_tcp.rst index 4a79209e77a7..7d9dfe36af45 100644 --- a/Documentation/networking/proc_net_tcp.txt +++ b/Documentation/networking/proc_net_tcp.rst @@ -1,15 +1,21 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================================ +The proc/net/tcp and proc/net/tcp6 variables +============================================ + This document describes the interfaces /proc/net/tcp and /proc/net/tcp6. Note that these interfaces are deprecated in favor of tcp_diag. -These /proc interfaces provide information about currently active TCP +These /proc interfaces provide information about currently active TCP connections, and are implemented by tcp4_seq_show() in net/ipv4/tcp_ipv4.c and tcp6_seq_show() in net/ipv6/tcp_ipv6.c, respectively. It will first list all listening TCP sockets, and next list all established -TCP connections. A typical entry of /proc/net/tcp would look like this (split -up into 3 parts because of the length of the line): +TCP connections. A typical entry of /proc/net/tcp would look like this (split +up into 3 parts because of the length of the line):: - 46: 010310AC:9C4C 030310AC:1770 01 + 46: 010310AC:9C4C 030310AC:1770 01 | | | | | |--> connection state | | | | |------> remote TCP port number | | | |-------------> remote IPv4 address @@ -17,7 +23,7 @@ up into 3 parts because of the length of the line): | |---------------------------> local IPv4 address |----------------------------------> number of entry - 00000150:00000000 01:00000019 00000000 + 00000150:00000000 01:00000019 00000000 | | | | |--> number of unrecovered RTO timeouts | | | |----------> number of jiffies until timer expires | | |----------------> timer_active (see below) @@ -25,7 +31,7 @@ up into 3 parts because of the length of the line): |-------------------------------> transmit-queue 1000 0 54165785 4 cd1e6040 25 4 27 3 -1 - | | | | | | | | | |--> slow start size threshold, + | | | | | | | | | |--> slow start size threshold, | | | | | | | | | or -1 if the threshold | | | | | | | | | is >= 0xFFFF | | | | | | | | |----> sending congestion window @@ -40,9 +46,12 @@ up into 3 parts because of the length of the line): |---------------------------------------------> uid timer_active: + + == ================================================================ 0 no timer is pending 1 retransmit-timer is pending 2 another timer (e.g. delayed ack or keepalive) is pending - 3 this is a socket in TIME_WAIT state. Not all fields will contain + 3 this is a socket in TIME_WAIT state. Not all fields will contain data (or even exist) 4 zero window probe timer is pending + == ================================================================ |