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91051f0039
Walk the hashinfo->bhash2 table so that inet_diag can dump TCP sockets that are bound but haven't yet called connect() or listen(). The code is inspired by the ->lhash2 loop. However there's no manual test of the source port, since this kind of filtering is already handled by inet_diag_bc_sk(). Also, a maximum of 16 sockets are dumped at a time, to avoid running with bh disabled for too long. There's no TCP state for bound but otherwise inactive sockets. Such sockets normally map to TCP_CLOSE. However, "ss -l", which is supposed to only dump listening sockets, actually requests the kernel to dump sockets in either the TCP_LISTEN or TCP_CLOSE states. To avoid dumping bound-only sockets with "ss -l", we therefore need to define a new pseudo-state (TCP_BOUND_INACTIVE) that user space will be able to set explicitly. With an IPv4, an IPv6 and an IPv6-only socket, bound respectively to 40000, 64000, 60000, an updated version of iproute2 could work as follow: $ ss -t state bound-inactive Recv-Q Send-Q Local Address:Port Peer Address:Port Process 0 0 0.0.0.0:40000 0.0.0.0:* 0 0 [::]:60000 [::]:* 0 0 *:64000 *:* Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Guillaume Nault <gnault@redhat.com> Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com> Link: https://lore.kernel.org/r/b3a84ae61e19c06806eea9c602b3b66e8f0cfc81.1701362867.git.gnault@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the TCP protocol sk_state field.
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*/
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#ifndef _LINUX_TCP_STATES_H
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#define _LINUX_TCP_STATES_H
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enum {
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TCP_ESTABLISHED = 1,
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TCP_SYN_SENT,
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TCP_SYN_RECV,
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TCP_FIN_WAIT1,
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TCP_FIN_WAIT2,
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TCP_TIME_WAIT,
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TCP_CLOSE,
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TCP_CLOSE_WAIT,
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TCP_LAST_ACK,
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TCP_LISTEN,
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TCP_CLOSING, /* Now a valid state */
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TCP_NEW_SYN_RECV,
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TCP_BOUND_INACTIVE, /* Pseudo-state for inet_diag */
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TCP_MAX_STATES /* Leave at the end! */
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};
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#define TCP_STATE_MASK 0xF
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#define TCP_ACTION_FIN (1 << TCP_CLOSE)
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enum {
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TCPF_ESTABLISHED = (1 << TCP_ESTABLISHED),
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TCPF_SYN_SENT = (1 << TCP_SYN_SENT),
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TCPF_SYN_RECV = (1 << TCP_SYN_RECV),
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TCPF_FIN_WAIT1 = (1 << TCP_FIN_WAIT1),
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TCPF_FIN_WAIT2 = (1 << TCP_FIN_WAIT2),
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TCPF_TIME_WAIT = (1 << TCP_TIME_WAIT),
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TCPF_CLOSE = (1 << TCP_CLOSE),
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TCPF_CLOSE_WAIT = (1 << TCP_CLOSE_WAIT),
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TCPF_LAST_ACK = (1 << TCP_LAST_ACK),
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TCPF_LISTEN = (1 << TCP_LISTEN),
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TCPF_CLOSING = (1 << TCP_CLOSING),
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TCPF_NEW_SYN_RECV = (1 << TCP_NEW_SYN_RECV),
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TCPF_BOUND_INACTIVE = (1 << TCP_BOUND_INACTIVE),
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};
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#endif /* _LINUX_TCP_STATES_H */
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