156 lines
4.3 KiB
C
156 lines
4.3 KiB
C
/*
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* Copyright (c) 2006 Oracle. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/in.h>
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#include <net/tcp.h>
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#include "rds.h"
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#include "tcp.h"
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void rds_tcp_state_change(struct sock *sk)
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{
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void (*state_change)(struct sock *sk);
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struct rds_connection *conn;
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struct rds_tcp_connection *tc;
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read_lock(&sk->sk_callback_lock);
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conn = sk->sk_user_data;
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if (!conn) {
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state_change = sk->sk_state_change;
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goto out;
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}
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tc = conn->c_transport_data;
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state_change = tc->t_orig_state_change;
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rdsdebug("sock %p state_change to %d\n", tc->t_sock, sk->sk_state);
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switch(sk->sk_state) {
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/* ignore connecting sockets as they make progress */
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case TCP_SYN_SENT:
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case TCP_SYN_RECV:
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break;
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case TCP_ESTABLISHED:
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rds_connect_complete(conn);
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break;
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case TCP_CLOSE:
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rds_conn_drop(conn);
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default:
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break;
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}
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out:
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read_unlock(&sk->sk_callback_lock);
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state_change(sk);
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}
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int rds_tcp_conn_connect(struct rds_connection *conn)
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{
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struct socket *sock = NULL;
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struct sockaddr_in src, dest;
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int ret;
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ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
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if (ret < 0)
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goto out;
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rds_tcp_tune(sock);
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src.sin_family = AF_INET;
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src.sin_addr.s_addr = (__force u32)conn->c_laddr;
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src.sin_port = (__force u16)htons(0);
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ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src));
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if (ret) {
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rdsdebug("bind failed with %d at address %pI4\n",
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ret, &conn->c_laddr);
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goto out;
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}
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dest.sin_family = AF_INET;
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dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
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dest.sin_port = (__force u16)htons(RDS_TCP_PORT);
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/*
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* once we call connect() we can start getting callbacks and they
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* own the socket
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*/
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rds_tcp_set_callbacks(sock, conn);
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ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
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O_NONBLOCK);
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rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
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if (ret == -EINPROGRESS)
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ret = 0;
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if (ret == 0)
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sock = NULL;
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else
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rds_tcp_restore_callbacks(sock, conn->c_transport_data);
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out:
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if (sock)
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sock_release(sock);
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return ret;
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}
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/*
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* Before killing the tcp socket this needs to serialize with callbacks. The
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* caller has already grabbed the sending sem so we're serialized with other
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* senders.
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*
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* TCP calls the callbacks with the sock lock so we hold it while we reset the
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* callbacks to those set by TCP. Our callbacks won't execute again once we
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* hold the sock lock.
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*/
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void rds_tcp_conn_shutdown(struct rds_connection *conn)
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{
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struct rds_tcp_connection *tc = conn->c_transport_data;
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struct socket *sock = tc->t_sock;
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rdsdebug("shutting down conn %p tc %p sock %p\n", conn, tc, sock);
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if (sock) {
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sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
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lock_sock(sock->sk);
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rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
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release_sock(sock->sk);
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sock_release(sock);
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}
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if (tc->t_tinc) {
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rds_inc_put(&tc->t_tinc->ti_inc);
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tc->t_tinc = NULL;
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}
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tc->t_tinc_hdr_rem = sizeof(struct rds_header);
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tc->t_tinc_data_rem = 0;
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}
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