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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(&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_WAIT:
66 case TCP_CLOSE:
67 rds_conn_drop(conn);
68 default:
69 break;
70 }
71out:
72 read_unlock(&sk->sk_callback_lock);
73 state_change(sk);
74}
75
76int rds_tcp_conn_connect(struct rds_connection *conn)
77{
78 struct socket *sock = NULL;
79 struct sockaddr_in src, dest;
80 int ret;
81 struct rds_tcp_connection *tc = conn->c_transport_data;
82
83 mutex_lock(&tc->t_conn_lock);
84
85 if (rds_conn_up(conn)) {
86 mutex_unlock(&tc->t_conn_lock);
87 return 0;
88 }
89 ret = sock_create_kern(rds_conn_net(conn), PF_INET,
90 SOCK_STREAM, IPPROTO_TCP, &sock);
91 if (ret < 0)
92 goto out;
93
94 rds_tcp_tune(sock);
95
96 src.sin_family = AF_INET;
97 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
98 src.sin_port = (__force u16)htons(0);
99
100 ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src));
101 if (ret) {
102 rdsdebug("bind failed with %d at address %pI4\n",
103 ret, &conn->c_laddr);
104 goto out;
105 }
106
107 dest.sin_family = AF_INET;
108 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
109 dest.sin_port = (__force u16)htons(RDS_TCP_PORT);
110
111 /*
112 * once we call connect() we can start getting callbacks and they
113 * own the socket
114 */
115 rds_tcp_set_callbacks(sock, conn);
116 ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
117 O_NONBLOCK);
118
119 rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
120 if (ret == -EINPROGRESS)
121 ret = 0;
122 if (ret == 0) {
123 rds_tcp_keepalive(sock);
124 sock = NULL;
125 } else {
126 rds_tcp_restore_callbacks(sock, conn->c_transport_data);
127 }
128
129out:
130 mutex_unlock(&tc->t_conn_lock);
131 if (sock)
132 sock_release(sock);
133 return ret;
134}
135
136/*
137 * Before killing the tcp socket this needs to serialize with callbacks. The
138 * caller has already grabbed the sending sem so we're serialized with other
139 * senders.
140 *
141 * TCP calls the callbacks with the sock lock so we hold it while we reset the
142 * callbacks to those set by TCP. Our callbacks won't execute again once we
143 * hold the sock lock.
144 */
145void rds_tcp_conn_shutdown(struct rds_connection *conn)
146{
147 struct rds_tcp_connection *tc = conn->c_transport_data;
148 struct socket *sock = tc->t_sock;
149
150 rdsdebug("shutting down conn %p tc %p sock %p\n", conn, tc, sock);
151
152 if (sock) {
153 sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
154 lock_sock(sock->sk);
155 rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
156
157 release_sock(sock->sk);
158 sock_release(sock);
159 }
160
161 if (tc->t_tinc) {
162 rds_inc_put(&tc->t_tinc->ti_inc);
163 tc->t_tinc = NULL;
164 }
165 tc->t_tinc_hdr_rem = sizeof(struct rds_header);
166 tc->t_tinc_data_rem = 0;
167}
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}