我想知道/proc/net/tcp
中st
列的可能值。 我认为st
列等于来自netstat(8)
或ss(8)
STATE列。
我已经设法识别三个代码:
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode 0: 0100007F:08A0 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 7321 1 ffff81002f449980 3000 0 0 2 -1 1: 00000000:006F 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 6656 1 ffff81003a30c080 3000 0 0 2 -1 2: 00000000:0272 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 6733 1 ffff81003a30c6c0 3000 0 0 2 -1 3: 0100007F:0277 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 7411 1 ffff81002f448d00 3000 0 0 2 -1 4: 0100007F:0019 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 7520 1 ffff81002f4486c0 3000 0 0 2 -1 5: 0100007F:089F 00000000:0000 0A 00000000:00000000 00:00000000 00000000 0 0 7339 1 ffff81002f449340 3000 0 0 2 -1 6: 0100007F:E753 0100007F:0016 01 00000000:00000000 02:000AFA92 00000000 500 0 18198 2 ffff81002f448080 204 40 20 2 -1 7: 0100007F:E752 0100007F:0016 06 00000000:00000000 03:000005EC 00000000 0 0 0 2 ffff81000805dc00
以上显示:
st = 0A = LISTEN
st = 01 = ESTABLISHED
st = 06 = TIME_WAIT
任何人都可以在此列表上展开? proc(5)
页在这个问题上非常简洁:
/proc/net/tcp Holds a dump of the TCP socket table. Much of the information is not of use apart from debugging. The "sl" value is the kernel hash slot for the socket, the "local address" is the local address and port number pair. The "remote address" is the remote address and port number pair (if connected). 'St' is the internal status of the socket. The 'tx_queue' and 'rx_queue' are the outgoing and incom- ing data queue in terms of kernel memory usage. The "tr", "tm->when", and "rexmits" fields hold internal information of the kernel socket state and are only useful for debugging. The "uid" field holds the effective UID of the creator of the socket.
在相关说明中,上面的/ proc / net / tcp输出显示了一些监听进程(2208,62,111等)。 但是,我看不到tcp / 22上的监听tcp连接,尽pipe显示了已build立的和time_wait状态。 是的,我可以在/proc/net/tcp6
看到它们,但是它们也不应该出现在/proc/net/tcp
吗? Netstat输出显示与仅绑定到ipv4的应用程序不同。 例如
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 4231/portmap tcp 0 0 :::22 :::* LISTEN 4556/sshd
非常感谢,安德鲁
它们应该匹配Linux内核源码中的./include/net/tcp_states.h中的枚举:
enum { TCP_ESTABLISHED = 1, TCP_SYN_SENT, TCP_SYN_RECV, TCP_FIN_WAIT1, TCP_FIN_WAIT2, TCP_TIME_WAIT, TCP_CLOSE, TCP_CLOSE_WAIT, TCP_LAST_ACK, TCP_LISTEN, TCP_CLOSING, /* Now a valid state */ TCP_MAX_STATES /* Leave at the end! */ };
至于你的2.问题,你真的确定没有一个sshd听例如0.0.0.0:22? 如果没有,我怀疑你所看到的与v4-mapped-on-v6套接字有关,参见例如man 7 ipv6