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_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 } 70 out: 71 read_unlock_bh(&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 %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; 114 115 out: 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 */ 130 void 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 } 153