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-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
-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):
-
- 46: 010310AC:9C4C 030310AC:1770 01
- | | | | | |--> connection state
- | | | | |------> remote TCP port number
- | | | |-------------> remote IPv4 address
- | | |--------------------> local TCP port number
- | |---------------------------> local IPv4 address
- |----------------------------------> number of entry
-
- 00000150:00000000 01:00000019 00000000
- | | | | |--> number of unrecovered RTO timeouts
- | | | |----------> number of jiffies until timer expires
- | | |----------------> timer_active (see below)
- | |----------------------> receive-queue
- |-------------------------------> transmit-queue
-
- 1000 0 54165785 4 cd1e6040 25 4 27 3 -1
- | | | | | | | | | |--> slow start size threshold,
- | | | | | | | | | or -1 if the threshold
- | | | | | | | | | is >= 0xFFFF
- | | | | | | | | |----> sending congestion window
- | | | | | | | |-------> (ack.quick<<1)|ack.pingpong
- | | | | | | |---------> Predicted tick of soft clock
- | | | | | | (delayed ACK control data)
- | | | | | |------------> retransmit timeout
- | | | | |------------------> location of socket in memory
- | | | |-----------------------> socket reference count
- | | |-----------------------------> inode
- | |----------------------------------> unanswered 0-window probes
- |---------------------------------------------> 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
- data (or even exist)
- 4 zero window probe timer is pending