/*
 * Copyright (c) 2006 Oracle.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
#include <linux/kernel.h>
#include <linux/in.h>
#include <net/tcp.h>

#include "rds.h"
#include "tcp.h"

void rds_tcp_state_change(struct sock *sk)
{
	void (*state_change)(struct sock *sk);
	struct rds_conn_path *cp;
	struct rds_tcp_connection *tc;

	read_lock_bh(&sk->sk_callback_lock);
	cp = sk->sk_user_data;
	if (!cp) {
		state_change = sk->sk_state_change;
		goto out;
	}
	tc = cp->cp_transport_data;
	state_change = tc->t_orig_state_change;

	rdsdebug("sock %p state_change to %d\n", tc->t_sock, sk->sk_state);

	switch (sk->sk_state) {
	/* ignore connecting sockets as they make progress */
	case TCP_SYN_SENT:
	case TCP_SYN_RECV:
		break;
	case TCP_ESTABLISHED:
		/* Force the peer to reconnect so that we have the
		 * TCP ports going from <smaller-ip>.<transient> to
		 * <larger-ip>.<RDS_TCP_PORT>. We avoid marking the
		 * RDS connection as RDS_CONN_UP until the reconnect,
		 * to avoid RDS datagram loss.
		 */
		if (cp->cp_conn->c_laddr > cp->cp_conn->c_faddr &&
		    rds_conn_path_transition(cp, RDS_CONN_CONNECTING,
					     RDS_CONN_ERROR)) {
			rds_conn_path_drop(cp);
		} else {
			rds_connect_path_complete(cp, RDS_CONN_CONNECTING);
		}
		break;
	case TCP_CLOSE_WAIT:
	case TCP_CLOSE:
		rds_conn_path_drop(cp);
	default:
		break;
	}
out:
	read_unlock_bh(&sk->sk_callback_lock);
	state_change(sk);
}

int rds_tcp_conn_path_connect(struct rds_conn_path *cp)
{
	struct socket *sock = NULL;
	struct sockaddr_in src, dest;
	int ret;
	struct rds_connection *conn = cp->cp_conn;
	struct rds_tcp_connection *tc = cp->cp_transport_data;

	/* for multipath rds,we only trigger the connection after
	 * the handshake probe has determined the number of paths.
	 */
	if (cp->cp_index > 0 && cp->cp_conn->c_npaths < 2)
		return -EAGAIN;

	mutex_lock(&tc->t_conn_path_lock);

	if (rds_conn_path_up(cp)) {
		mutex_unlock(&tc->t_conn_path_lock);
		return 0;
	}
	ret = sock_create_kern(rds_conn_net(conn), PF_INET,
			       SOCK_STREAM, IPPROTO_TCP, &sock);
	if (ret < 0)
		goto out;

	rds_tcp_tune(sock);

	src.sin_family = AF_INET;
	src.sin_addr.s_addr = (__force u32)conn->c_laddr;
	src.sin_port = (__force u16)htons(0);

	ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src));
	if (ret) {
		rdsdebug("bind failed with %d at address %pI4\n",
			 ret, &conn->c_laddr);
		goto out;
	}

	dest.sin_family = AF_INET;
	dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
	dest.sin_port = (__force u16)htons(RDS_TCP_PORT);

	/*
	 * once we call connect() we can start getting callbacks and they
	 * own the socket
	 */
	rds_tcp_set_callbacks(sock, cp);
	ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
				 O_NONBLOCK);

	cp->cp_outgoing = 1;
	rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
	if (ret == -EINPROGRESS)
		ret = 0;
	if (ret == 0) {
		rds_tcp_keepalive(sock);
		sock = NULL;
	} else {
		rds_tcp_restore_callbacks(sock, cp->cp_transport_data);
	}

out:
	mutex_unlock(&tc->t_conn_path_lock);
	if (sock)
		sock_release(sock);
	return ret;
}

/*
 * Before killing the tcp socket this needs to serialize with callbacks.  The
 * caller has already grabbed the sending sem so we're serialized with other
 * senders.
 *
 * TCP calls the callbacks with the sock lock so we hold it while we reset the
 * callbacks to those set by TCP.  Our callbacks won't execute again once we
 * hold the sock lock.
 */
void rds_tcp_conn_path_shutdown(struct rds_conn_path *cp)
{
	struct rds_tcp_connection *tc = cp->cp_transport_data;
	struct socket *sock = tc->t_sock;

	rdsdebug("shutting down conn %p tc %p sock %p\n",
		 cp->cp_conn, tc, sock);

	if (sock) {
		sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
		lock_sock(sock->sk);
		rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */

		release_sock(sock->sk);
		sock_release(sock);
	}

	if (tc->t_tinc) {
		rds_inc_put(&tc->t_tinc->ti_inc);
		tc->t_tinc = NULL;
	}
	tc->t_tinc_hdr_rem = sizeof(struct rds_header);
	tc->t_tinc_data_rem = 0;
}
'>b272f732f888d4cf43c943a40c9aaa836f9b7431</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/unix?id=3ddc76dfc786cc6f87852693227fb0b1f124f807&amp;id2=b272f732f888d4cf43c943a40c9aaa836f9b7431'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/unix?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>1f3a8e49d8f28f498b8694464623ac20aebfe62a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/unix?id=3ddc76dfc786cc6f87852693227fb0b1f124f807&amp;id2=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip</div><div class='commit-msg'>Pull timer type cleanups from Thomas Gleixner:
 "This series does a tree wide cleanup of types related to
  timers/timekeeping.

   - Get rid of cycles_t and use a plain u64. The type is not really
     helpful and caused more confusion than clarity

   - Get rid of the ktime union. The union has become useless as we use
     the scalar nanoseconds storage unconditionally now. The 32bit
     timespec alike storage got removed due to the Y2038 limitations
     some time ago.

     That leaves the odd union access around for no reason. Clean it up.

  Both changes have been done with coccinelle and a small amount of
  manual mopping up"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  ktime: Get rid of ktime_equal()
  ktime: Cleanup ktime_set() usage
  ktime: Get rid of the union
  clocksource: Use a plain u64 instead of cycle_t
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=3ddc76dfc786cc6f87852693227fb0b1f124f807'>Diffstat</a> (limited to 'net/unix')</div><table summary='diffstat' class='diffstat'>