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v3.5.6
  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
 40void 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
 46	read_lock_bh(&sk->sk_callback_lock);
 47	conn = sk->sk_user_data;
 48	if (!conn) {
 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;
 65		case TCP_CLOSE:
 66			rds_conn_drop(conn);
 67		default:
 68			break;
 
 
 
 
 
 
 
 
 
 
 
 
 
 69	}
 70out:
 71	read_unlock_bh(&sk->sk_callback_lock);
 72	state_change(sk);
 73}
 74
 75int rds_tcp_conn_connect(struct rds_connection *conn)
 76{
 77	struct socket *sock = NULL;
 78	struct sockaddr_in src, dest;
 79	int ret;
 
 
 80
 81	ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
 
 
 
 
 
 
 
 
 
 
 
 
 
 82	if (ret < 0)
 83		goto out;
 84
 85	rds_tcp_tune(sock);
 86
 87	src.sin_family = AF_INET;
 88	src.sin_addr.s_addr = (__force u32)conn->c_laddr;
 89	src.sin_port = (__force u16)htons(0);
 90
 91	ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src));
 92	if (ret) {
 93		rdsdebug("bind failed with %d at address %pI4\n",
 94			 ret, &conn->c_laddr);
 95		goto out;
 96	}
 97
 98	dest.sin_family = AF_INET;
 99	dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
100	dest.sin_port = (__force u16)htons(RDS_TCP_PORT);
101
102	/*
103	 * once we call connect() we can start getting callbacks and they
104	 * own the socket
105	 */
106	rds_tcp_set_callbacks(sock, conn);
107	ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
108				 O_NONBLOCK);
109	sock = NULL;
110
111	rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
112	if (ret == -EINPROGRESS)
113		ret = 0;
 
 
 
 
 
 
114
115out:
 
116	if (sock)
117		sock_release(sock);
118	return ret;
119}
120
121/*
122 * Before killing the tcp socket this needs to serialize with callbacks.  The
123 * caller has already grabbed the sending sem so we're serialized with other
124 * senders.
125 *
126 * TCP calls the callbacks with the sock lock so we hold it while we reset the
127 * callbacks to those set by TCP.  Our callbacks won't execute again once we
128 * hold the sock lock.
129 */
130void rds_tcp_conn_shutdown(struct rds_connection *conn)
131{
132	struct rds_tcp_connection *tc = conn->c_transport_data;
133	struct socket *sock = tc->t_sock;
134
135	rdsdebug("shutting down conn %p tc %p sock %p\n", conn, tc, sock);
 
136
137	if (sock) {
 
 
138		sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
139		lock_sock(sock->sk);
140		rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
141
142		release_sock(sock->sk);
143		sock_release(sock);
144	}
145
146	if (tc->t_tinc) {
147		rds_inc_put(&tc->t_tinc->ti_inc);
148		tc->t_tinc = NULL;
149	}
150	tc->t_tinc_hdr_rem = sizeof(struct rds_header);
151	tc->t_tinc_data_rem = 0;
152}
v4.17
  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
 40void rds_tcp_state_change(struct sock *sk)
 41{
 42	void (*state_change)(struct sock *sk);
 43	struct rds_conn_path *cp;
 44	struct rds_tcp_connection *tc;
 45
 46	read_lock_bh(&sk->sk_callback_lock);
 47	cp = sk->sk_user_data;
 48	if (!cp) {
 49		state_change = sk->sk_state_change;
 50		goto out;
 51	}
 52	tc = cp->cp_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		/* Force the peer to reconnect so that we have the
 64		 * TCP ports going from <smaller-ip>.<transient> to
 65		 * <larger-ip>.<RDS_TCP_PORT>. We avoid marking the
 66		 * RDS connection as RDS_CONN_UP until the reconnect,
 67		 * to avoid RDS datagram loss.
 68		 */
 69		if (!IS_CANONICAL(cp->cp_conn->c_laddr, cp->cp_conn->c_faddr) &&
 70		    rds_conn_path_transition(cp, RDS_CONN_CONNECTING,
 71					     RDS_CONN_ERROR)) {
 72			rds_conn_path_drop(cp, false);
 73		} else {
 74			rds_connect_path_complete(cp, RDS_CONN_CONNECTING);
 75		}
 76		break;
 77	case TCP_CLOSE_WAIT:
 78	case TCP_CLOSE:
 79		rds_conn_path_drop(cp, false);
 80	default:
 81		break;
 82	}
 83out:
 84	read_unlock_bh(&sk->sk_callback_lock);
 85	state_change(sk);
 86}
 87
 88int rds_tcp_conn_path_connect(struct rds_conn_path *cp)
 89{
 90	struct socket *sock = NULL;
 91	struct sockaddr_in src, dest;
 92	int ret;
 93	struct rds_connection *conn = cp->cp_conn;
 94	struct rds_tcp_connection *tc = cp->cp_transport_data;
 95
 96	/* for multipath rds,we only trigger the connection after
 97	 * the handshake probe has determined the number of paths.
 98	 */
 99	if (cp->cp_index > 0 && cp->cp_conn->c_npaths < 2)
100		return -EAGAIN;
101
102	mutex_lock(&tc->t_conn_path_lock);
103
104	if (rds_conn_path_up(cp)) {
105		mutex_unlock(&tc->t_conn_path_lock);
106		return 0;
107	}
108	ret = sock_create_kern(rds_conn_net(conn), PF_INET,
109			       SOCK_STREAM, IPPROTO_TCP, &sock);
110	if (ret < 0)
111		goto out;
112
113	rds_tcp_tune(sock);
114
115	src.sin_family = AF_INET;
116	src.sin_addr.s_addr = (__force u32)conn->c_laddr;
117	src.sin_port = (__force u16)htons(0);
118
119	ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src));
120	if (ret) {
121		rdsdebug("bind failed with %d at address %pI4\n",
122			 ret, &conn->c_laddr);
123		goto out;
124	}
125
126	dest.sin_family = AF_INET;
127	dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
128	dest.sin_port = (__force u16)htons(RDS_TCP_PORT);
129
130	/*
131	 * once we call connect() we can start getting callbacks and they
132	 * own the socket
133	 */
134	rds_tcp_set_callbacks(sock, cp);
135	ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
136				 O_NONBLOCK);
 
137
138	rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
139	if (ret == -EINPROGRESS)
140		ret = 0;
141	if (ret == 0) {
142		rds_tcp_keepalive(sock);
143		sock = NULL;
144	} else {
145		rds_tcp_restore_callbacks(sock, cp->cp_transport_data);
146	}
147
148out:
149	mutex_unlock(&tc->t_conn_path_lock);
150	if (sock)
151		sock_release(sock);
152	return ret;
153}
154
155/*
156 * Before killing the tcp socket this needs to serialize with callbacks.  The
157 * caller has already grabbed the sending sem so we're serialized with other
158 * senders.
159 *
160 * TCP calls the callbacks with the sock lock so we hold it while we reset the
161 * callbacks to those set by TCP.  Our callbacks won't execute again once we
162 * hold the sock lock.
163 */
164void rds_tcp_conn_path_shutdown(struct rds_conn_path *cp)
165{
166	struct rds_tcp_connection *tc = cp->cp_transport_data;
167	struct socket *sock = tc->t_sock;
168
169	rdsdebug("shutting down conn %p tc %p sock %p\n",
170		 cp->cp_conn, tc, sock);
171
172	if (sock) {
173		if (rds_destroy_pending(cp->cp_conn))
174			rds_tcp_set_linger(sock);
175		sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
176		lock_sock(sock->sk);
177		rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
178
179		release_sock(sock->sk);
180		sock_release(sock);
181	}
182
183	if (tc->t_tinc) {
184		rds_inc_put(&tc->t_tinc->ti_inc);
185		tc->t_tinc = NULL;
186	}
187	tc->t_tinc_hdr_rem = sizeof(struct rds_header);
188	tc->t_tinc_data_rem = 0;
189}