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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_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}
1/*
2 * Copyright (c) 2006, 2017 Oracle and/or its affiliates. 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 (rds_addr_cmp(&cp->cp_conn->c_laddr,
70 &cp->cp_conn->c_faddr) >= 0 &&
71 rds_conn_path_transition(cp, RDS_CONN_CONNECTING,
72 RDS_CONN_ERROR)) {
73 rds_conn_path_drop(cp, false);
74 } else {
75 rds_connect_path_complete(cp, RDS_CONN_CONNECTING);
76 }
77 break;
78 case TCP_CLOSE_WAIT:
79 case TCP_CLOSE:
80 rds_conn_path_drop(cp, false);
81 break;
82 default:
83 break;
84 }
85out:
86 read_unlock_bh(&sk->sk_callback_lock);
87 state_change(sk);
88}
89
90int rds_tcp_conn_path_connect(struct rds_conn_path *cp)
91{
92 struct socket *sock = NULL;
93 struct sockaddr_in6 sin6;
94 struct sockaddr_in sin;
95 struct sockaddr *addr;
96 int addrlen;
97 bool isv6;
98 int ret;
99 struct rds_connection *conn = cp->cp_conn;
100 struct rds_tcp_connection *tc = cp->cp_transport_data;
101
102 /* for multipath rds,we only trigger the connection after
103 * the handshake probe has determined the number of paths.
104 */
105 if (cp->cp_index > 0 && cp->cp_conn->c_npaths < 2)
106 return -EAGAIN;
107
108 mutex_lock(&tc->t_conn_path_lock);
109
110 if (rds_conn_path_up(cp)) {
111 mutex_unlock(&tc->t_conn_path_lock);
112 return 0;
113 }
114 if (ipv6_addr_v4mapped(&conn->c_laddr)) {
115 ret = sock_create_kern(rds_conn_net(conn), PF_INET,
116 SOCK_STREAM, IPPROTO_TCP, &sock);
117 isv6 = false;
118 } else {
119 ret = sock_create_kern(rds_conn_net(conn), PF_INET6,
120 SOCK_STREAM, IPPROTO_TCP, &sock);
121 isv6 = true;
122 }
123
124 if (ret < 0)
125 goto out;
126
127 rds_tcp_tune(sock);
128
129 if (isv6) {
130 sin6.sin6_family = AF_INET6;
131 sin6.sin6_addr = conn->c_laddr;
132 sin6.sin6_port = 0;
133 sin6.sin6_flowinfo = 0;
134 sin6.sin6_scope_id = conn->c_dev_if;
135 addr = (struct sockaddr *)&sin6;
136 addrlen = sizeof(sin6);
137 } else {
138 sin.sin_family = AF_INET;
139 sin.sin_addr.s_addr = conn->c_laddr.s6_addr32[3];
140 sin.sin_port = 0;
141 addr = (struct sockaddr *)&sin;
142 addrlen = sizeof(sin);
143 }
144
145 ret = sock->ops->bind(sock, addr, addrlen);
146 if (ret) {
147 rdsdebug("bind failed with %d at address %pI6c\n",
148 ret, &conn->c_laddr);
149 goto out;
150 }
151
152 if (isv6) {
153 sin6.sin6_family = AF_INET6;
154 sin6.sin6_addr = conn->c_faddr;
155 sin6.sin6_port = htons(RDS_TCP_PORT);
156 sin6.sin6_flowinfo = 0;
157 sin6.sin6_scope_id = conn->c_dev_if;
158 addr = (struct sockaddr *)&sin6;
159 addrlen = sizeof(sin6);
160 } else {
161 sin.sin_family = AF_INET;
162 sin.sin_addr.s_addr = conn->c_faddr.s6_addr32[3];
163 sin.sin_port = htons(RDS_TCP_PORT);
164 addr = (struct sockaddr *)&sin;
165 addrlen = sizeof(sin);
166 }
167
168 /*
169 * once we call connect() we can start getting callbacks and they
170 * own the socket
171 */
172 rds_tcp_set_callbacks(sock, cp);
173 ret = sock->ops->connect(sock, addr, addrlen, O_NONBLOCK);
174
175 rdsdebug("connect to address %pI6c returned %d\n", &conn->c_faddr, ret);
176 if (ret == -EINPROGRESS)
177 ret = 0;
178 if (ret == 0) {
179 rds_tcp_keepalive(sock);
180 sock = NULL;
181 } else {
182 rds_tcp_restore_callbacks(sock, cp->cp_transport_data);
183 }
184
185out:
186 mutex_unlock(&tc->t_conn_path_lock);
187 if (sock)
188 sock_release(sock);
189 return ret;
190}
191
192/*
193 * Before killing the tcp socket this needs to serialize with callbacks. The
194 * caller has already grabbed the sending sem so we're serialized with other
195 * senders.
196 *
197 * TCP calls the callbacks with the sock lock so we hold it while we reset the
198 * callbacks to those set by TCP. Our callbacks won't execute again once we
199 * hold the sock lock.
200 */
201void rds_tcp_conn_path_shutdown(struct rds_conn_path *cp)
202{
203 struct rds_tcp_connection *tc = cp->cp_transport_data;
204 struct socket *sock = tc->t_sock;
205
206 rdsdebug("shutting down conn %p tc %p sock %p\n",
207 cp->cp_conn, tc, sock);
208
209 if (sock) {
210 if (rds_destroy_pending(cp->cp_conn))
211 sock_no_linger(sock->sk);
212 sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
213 lock_sock(sock->sk);
214 rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
215
216 release_sock(sock->sk);
217 sock_release(sock);
218 }
219
220 if (tc->t_tinc) {
221 rds_inc_put(&tc->t_tinc->ti_inc);
222 tc->t_tinc = NULL;
223 }
224 tc->t_tinc_hdr_rem = sizeof(struct rds_header);
225 tc->t_tinc_data_rem = 0;
226}