netdev - Re: [iproute PATCH v2 2/2] ss: support closing inet sockets via SOCK

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Date:	Tue, 22 Dec 2015 17:31:32 +0900
From:	Lorenzo Colitti <lorenzo@...gle.com>
To:	netdev@...r.kernel.org
Cc:	stephen@...workplumber.org, eric.dumazet@...il.com,
	zenczykowski@...il.com
Subject: Re: [iproute PATCH v2 2/2] ss: support closing inet sockets via SOCK_DESTROY.

I've just uploaded a new version. The changes from v2 are as
follows:

- Removed the superfluous inline keyword.
- The code now ignores ENOENT from kill_inet_sock. This can
  happen if something else closed the socket during the scan, or
  if the user requests killing a socket that is not in the hash
  tables and thus cannot be found by inet_diag_find_one_icsk.
- The semantics of rtnl_send_check_ack are clearer. If the caller
  passes in ack=1, the function blocks until a response is
  received (unlike v2 which passed in MSG_PEEK). Also, an
  NLMSG_ERROR with an err of 0 is not treated as a failure.
- kill_inet_sock always requests an ACK when closing a socket.

This version is also tested on real hardware. The following work:

- Passing in -K as non-root immediately stops with EPERM.
- Running "ss -a -K dport = :22" closes SSH.
- Running ss -a -K dport = :5222 closes my XMPP connections,
  interrupts my chat client, and sends RSTs to the server.
- The above command silently skips TIME_WAIT sockets, which
  cannot be destroyed, without interrupting the dump.

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