[linux.git] / net / rds / tcp_connect.c

/*
 * 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_connection *conn;
	struct rds_tcp_connection *tc;

	read_lock(&sk->sk_callback_lock);
	conn = sk->sk_user_data;
	if (!conn) {
		state_change = sk->sk_state_change;
		goto out;
	}
	tc = conn->c_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:
			rds_connect_complete(conn);
			break;
		case TCP_CLOSE_WAIT:
		case TCP_CLOSE:
			rds_conn_drop(conn);
		default:
			break;
	}
out:
	read_unlock(&sk->sk_callback_lock);
	state_change(sk);
}

int rds_tcp_conn_connect(struct rds_connection *conn)
{
	struct socket *sock = NULL;
	struct sockaddr_in src, dest;
	int ret;

	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, conn);
	ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
				 O_NONBLOCK);

	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, conn->c_transport_data);
	}

out:
	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_shutdown(struct rds_connection *conn)
{
	struct rds_tcp_connection *tc = conn->c_transport_data;
	struct socket *sock = tc->t_sock;

	rdsdebug("shutting down conn %p tc %p sock %p\n", 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;
}
Commit	Line	Data
70041088 AG	1	/*
	2	* Copyright (c) 2006 Oracle. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*
	32	*/
	33	#include <linux/kernel.h>
	34	#include <linux/in.h>
	35	#include <net/tcp.h>
	36
	37	#include "rds.h"
	38	#include "tcp.h"
	39
	40	void rds_tcp_state_change(struct sock *sk)
	41	{
	42	void (state_change)(struct sock sk);
	43	struct rds_connection *conn;
	44	struct rds_tcp_connection *tc;
	45
bfdc587c	46	read_lock(&sk->sk_callback_lock);
70041088	47	conn = sk->sk_user_data;
8690bfa1	48	if (!conn) {
70041088 AG	49	state_change = sk->sk_state_change;
	50	goto out;
	51	}
	52	tc = conn->c_transport_data;
	53	state_change = tc->t_orig_state_change;
	54
	55	rdsdebug("sock %p state_change to %d\n", tc->t_sock, sk->sk_state);
	56
	57	switch(sk->sk_state) {
	58	/* ignore connecting sockets as they make progress */
	59	case TCP_SYN_SENT:
	60	case TCP_SYN_RECV:
	61	break;
	62	case TCP_ESTABLISHED:
	63	rds_connect_complete(conn);
	64	break;
f711a6ae	65	case TCP_CLOSE_WAIT:
70041088 AG	66	case TCP_CLOSE:
	67	rds_conn_drop(conn);
	68	default:
	69	break;
	70	}
	71	out:
bfdc587c	72	read_unlock(&sk->sk_callback_lock);
70041088 AG	73	state_change(sk);
	74	}
	75
	76	int rds_tcp_conn_connect(struct rds_connection *conn)
	77	{
	78	struct socket *sock = NULL;
	79	struct sockaddr_in src, dest;
	80	int ret;
	81
d5a8ac28 SV	82	ret = sock_create_kern(rds_conn_net(conn), PF_INET,
d5a8ac28 SV	83	SOCK_STREAM, IPPROTO_TCP, &sock);
70041088 AG	84	if (ret < 0)
	85	goto out;
	86
	87	rds_tcp_tune(sock);
	88
	89	src.sin_family = AF_INET;
	90	src.sin_addr.s_addr = (__force u32)conn->c_laddr;
	91	src.sin_port = (__force u16)htons(0);
	92
	93	ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src));
	94	if (ret) {
6884b348 JP	95	rdsdebug("bind failed with %d at address %pI4\n",
6884b348 JP	96	ret, &conn->c_laddr);
70041088 AG	97	goto out;
	98	}
	99
	100	dest.sin_family = AF_INET;
	101	dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
	102	dest.sin_port = (__force u16)htons(RDS_TCP_PORT);
	103
	104	/*
	105	* once we call connect() we can start getting callbacks and they
	106	* own the socket
	107	*/
	108	rds_tcp_set_callbacks(sock, conn);
	109	ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
	110	O_NONBLOCK);
70041088	111
6884b348	112	rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
70041088 AG	113	if (ret == -EINPROGRESS)
70041088 AG	114	ret = 0;
467fa153 SV	115	if (ret == 0) {
467fa153 SV	116	rds_tcp_keepalive(sock);
eb74cc97	117	sock = NULL;
467fa153	118	} else {
eb74cc97	119	rds_tcp_restore_callbacks(sock, conn->c_transport_data);
467fa153	120	}
70041088 AG	121
	122	out:
	123	if (sock)
	124	sock_release(sock);
	125	return ret;
	126	}
	127
	128	/*
	129	* Before killing the tcp socket this needs to serialize with callbacks. The
	130	* caller has already grabbed the sending sem so we're serialized with other
	131	* senders.
	132	*
	133	* TCP calls the callbacks with the sock lock so we hold it while we reset the
	134	* callbacks to those set by TCP. Our callbacks won't execute again once we
	135	* hold the sock lock.
	136	*/
	137	void rds_tcp_conn_shutdown(struct rds_connection *conn)
	138	{
	139	struct rds_tcp_connection *tc = conn->c_transport_data;
	140	struct socket *sock = tc->t_sock;
	141
	142	rdsdebug("shutting down conn %p tc %p sock %p\n", conn, tc, sock);
	143
	144	if (sock) {
	145	sock->ops->shutdown(sock, RCV_SHUTDOWN \| SEND_SHUTDOWN);
	146	lock_sock(sock->sk);
	147	rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
	148
	149	release_sock(sock->sk);
	150	sock_release(sock);
ccbd6a5a	151	}
70041088 AG	152
	153	if (tc->t_tinc) {
	154	rds_inc_put(&tc->t_tinc->ti_inc);
	155	tc->t_tinc = NULL;
	156	}
	157	tc->t_tinc_hdr_rem = sizeof(struct rds_header);
	158	tc->t_tinc_data_rem = 0;
	159	}