blob: 5cb16875c4603dba71c733de6600ada40e39cffc [file] [log] [blame]
Andy Grover70041082009-08-21 12:28:31 +00001/*
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
Ying Xuebfdc5872012-08-19 21:44:08 +000046 read_lock(&sk->sk_callback_lock);
Andy Grover70041082009-08-21 12:28:31 +000047 conn = sk->sk_user_data;
Andy Grover8690bfa2010-01-12 11:56:44 -080048 if (!conn) {
Andy Grover70041082009-08-21 12:28:31 +000049 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;
Sowmini Varadhanf711a6a2015-05-05 15:20:51 -040065 case TCP_CLOSE_WAIT:
Andy Grover70041082009-08-21 12:28:31 +000066 case TCP_CLOSE:
67 rds_conn_drop(conn);
68 default:
69 break;
70 }
71out:
Ying Xuebfdc5872012-08-19 21:44:08 +000072 read_unlock(&sk->sk_callback_lock);
Andy Grover70041082009-08-21 12:28:31 +000073 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
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -040082 ret = sock_create_kern(rds_conn_net(conn), PF_INET,
83 SOCK_STREAM, IPPROTO_TCP, &sock);
Andy Grover70041082009-08-21 12:28:31 +000084 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) {
Joe Perches6884b342010-02-02 12:43:59 +000095 rdsdebug("bind failed with %d at address %pI4\n",
96 ret, &conn->c_laddr);
Andy Grover70041082009-08-21 12:28:31 +000097 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);
Andy Grover70041082009-08-21 12:28:31 +0000111
Joe Perches6884b342010-02-02 12:43:59 +0000112 rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
Andy Grover70041082009-08-21 12:28:31 +0000113 if (ret == -EINPROGRESS)
114 ret = 0;
Sowmini Varadhan467fa152015-08-05 01:43:26 -0400115 if (ret == 0) {
116 rds_tcp_keepalive(sock);
Herton R. Krzesinskieb74cc92014-10-01 18:49:53 -0300117 sock = NULL;
Sowmini Varadhan467fa152015-08-05 01:43:26 -0400118 } else {
Herton R. Krzesinskieb74cc92014-10-01 18:49:53 -0300119 rds_tcp_restore_callbacks(sock, conn->c_transport_data);
Sowmini Varadhan467fa152015-08-05 01:43:26 -0400120 }
Andy Grover70041082009-08-21 12:28:31 +0000121
122out:
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 */
137void 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);
Joe Perchesccbd6a52010-05-14 10:58:26 +0000151 }
Andy Grover70041082009-08-21 12:28:31 +0000152
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}