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TOMOYO Linux Cross Reference
Linux/net/rds/tcp_connect.c

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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 
 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 
 46         read_lock(&sk->sk_callback_lock);
 47         conn = sk->sk_user_data;
 48         if (conn == NULL) {
 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         }
 70 out:
 71         read_unlock(&sk->sk_callback_lock);
 72         state_change(sk);
 73 }
 74 
 75 int 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 %u.%u.%u.%u\n",
 94                      ret, NIPQUAD(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 %u.%u.%u.%u returned %d\n",
112                  NIPQUAD(conn->c_faddr), ret);
113         if (ret == -EINPROGRESS)
114                 ret = 0;
115 
116 out:
117         if (sock)
118                 sock_release(sock);
119         return ret;
120 }
121 
122 /*
123  * Before killing the tcp socket this needs to serialize with callbacks.  The
124  * caller has already grabbed the sending sem so we're serialized with other
125  * senders.
126  *
127  * TCP calls the callbacks with the sock lock so we hold it while we reset the
128  * callbacks to those set by TCP.  Our callbacks won't execute again once we
129  * hold the sock lock.
130  */
131 void rds_tcp_conn_shutdown(struct rds_connection *conn)
132 {
133         struct rds_tcp_connection *tc = conn->c_transport_data;
134         struct socket *sock = tc->t_sock;
135 
136         rdsdebug("shutting down conn %p tc %p sock %p\n", conn, tc, sock);
137 
138         if (sock) {
139                 sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
140                 lock_sock(sock->sk);
141                 rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
142 
143                 release_sock(sock->sk);
144                 sock_release(sock);
145         };
146 
147         if (tc->t_tinc) {
148                 rds_inc_put(&tc->t_tinc->ti_inc);
149                 tc->t_tinc = NULL;
150         }
151         tc->t_tinc_hdr_rem = sizeof(struct rds_header);
152         tc->t_tinc_data_rem = 0;
153 }
154 

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