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docs: networking: convert proc_net_tcp.txt to ReST 

- add SPDX header;
- add a document title;
- mark code blocks and literals as such;
- mark tables as such;
- adjust identation, whitespaces and blank lines where needed;
- add to networking/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mauro Carvalho Chehab 2020-04-30 18:04:16 +02:00 committed by David S. Miller
parent 71120802eb
commit 832619012c
2 changed files with 17 additions and 7 deletions
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1
Documentation/networking/index.rst
View File

@ -94,6 +94,7 @@ Contents:
pktgen
plip
ppp_generic
proc_net_tcp
.. only:: subproject and html

23
Documentation/networking/proc_net_tcp.txt → Documentation/networking/proc_net_tcp.rst
View File

@ -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
== ================================================================