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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/networking/proc_net_tcp.txt
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+This document describes the interfaces /proc/net/tcp and /proc/net/tcp6.
+
+These /proc interfaces provide information about currently active TCP
+connections, and are implemented by tcp_get_info() in net/ipv4/tcp_ipv4.c and
+tcp6_get_info() 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 treshold
+ | | | | | | | | | 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