Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/gfp.h> |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 35 | #include <linux/in.h> |
| 36 | #include <net/tcp.h> |
| 37 | |
| 38 | #include "rds.h" |
| 39 | #include "tcp.h" |
| 40 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 41 | int rds_tcp_keepalive(struct socket *sock) |
Sowmini Varadhan | f711a6a | 2015-05-05 15:20:51 -0400 | [diff] [blame] | 42 | { |
| 43 | /* values below based on xs_udp_default_timeout */ |
| 44 | int keepidle = 5; /* send a probe 'keepidle' secs after last data */ |
| 45 | int keepcnt = 5; /* number of unack'ed probes before declaring dead */ |
| 46 | int keepalive = 1; |
| 47 | int ret = 0; |
| 48 | |
| 49 | ret = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
| 50 | (char *)&keepalive, sizeof(keepalive)); |
| 51 | if (ret < 0) |
| 52 | goto bail; |
| 53 | |
| 54 | ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT, |
| 55 | (char *)&keepcnt, sizeof(keepcnt)); |
| 56 | if (ret < 0) |
| 57 | goto bail; |
| 58 | |
| 59 | ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE, |
| 60 | (char *)&keepidle, sizeof(keepidle)); |
| 61 | if (ret < 0) |
| 62 | goto bail; |
| 63 | |
| 64 | /* KEEPINTVL is the interval between successive probes. We follow |
| 65 | * the model in xs_tcp_finish_connecting() and re-use keepidle. |
| 66 | */ |
| 67 | ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL, |
| 68 | (char *)&keepidle, sizeof(keepidle)); |
| 69 | bail: |
| 70 | return ret; |
| 71 | } |
| 72 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 73 | int rds_tcp_accept_one(struct socket *sock) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 74 | { |
| 75 | struct socket *new_sock = NULL; |
| 76 | struct rds_connection *conn; |
| 77 | int ret; |
| 78 | struct inet_sock *inet; |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 79 | struct rds_tcp_connection *rs_tcp = NULL; |
| 80 | int conn_state; |
| 81 | struct sock *nsk; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 82 | |
Sowmini Varadhan | 37e14f4 | 2016-05-18 10:06:23 -0700 | [diff] [blame] | 83 | if (!sock) /* module unload or netns delete in progress */ |
| 84 | return -ENETUNREACH; |
| 85 | |
Sowmini Varadhan | d5a8ac2 | 2015-08-05 01:43:25 -0400 | [diff] [blame] | 86 | ret = sock_create_kern(sock_net(sock->sk), sock->sk->sk_family, |
| 87 | sock->sk->sk_type, sock->sk->sk_protocol, |
| 88 | &new_sock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 89 | if (ret) |
| 90 | goto out; |
| 91 | |
| 92 | new_sock->type = sock->type; |
| 93 | new_sock->ops = sock->ops; |
| 94 | ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); |
| 95 | if (ret < 0) |
| 96 | goto out; |
| 97 | |
Sowmini Varadhan | f711a6a | 2015-05-05 15:20:51 -0400 | [diff] [blame] | 98 | ret = rds_tcp_keepalive(new_sock); |
| 99 | if (ret < 0) |
| 100 | goto out; |
| 101 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 102 | rds_tcp_tune(new_sock); |
| 103 | |
| 104 | inet = inet_sk(new_sock->sk); |
| 105 | |
Joe Perches | 6884b34 | 2010-02-02 12:43:59 +0000 | [diff] [blame] | 106 | rdsdebug("accepted tcp %pI4:%u -> %pI4:%u\n", |
| 107 | &inet->inet_saddr, ntohs(inet->inet_sport), |
| 108 | &inet->inet_daddr, ntohs(inet->inet_dport)); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 109 | |
Sowmini Varadhan | d5a8ac2 | 2015-08-05 01:43:25 -0400 | [diff] [blame] | 110 | conn = rds_conn_create(sock_net(sock->sk), |
| 111 | inet->inet_saddr, inet->inet_daddr, |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 112 | &rds_tcp_transport, GFP_KERNEL); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 113 | if (IS_ERR(conn)) { |
| 114 | ret = PTR_ERR(conn); |
| 115 | goto out; |
| 116 | } |
Sowmini Varadhan | f711a6a | 2015-05-05 15:20:51 -0400 | [diff] [blame] | 117 | /* An incoming SYN request came in, and TCP just accepted it. |
Sowmini Varadhan | f711a6a | 2015-05-05 15:20:51 -0400 | [diff] [blame] | 118 | * |
| 119 | * If the client reboots, this conn will need to be cleaned up. |
| 120 | * rds_tcp_state_change() will do that cleanup |
| 121 | */ |
| 122 | rs_tcp = (struct rds_tcp_connection *)conn->c_transport_data; |
Sowmini Varadhan | 3b20fc3 | 2015-09-30 16:54:07 -0400 | [diff] [blame] | 123 | rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING); |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 124 | mutex_lock(&rs_tcp->t_conn_lock); |
| 125 | conn_state = rds_conn_state(conn); |
| 126 | if (conn_state != RDS_CONN_CONNECTING && conn_state != RDS_CONN_UP) |
| 127 | goto rst_nsk; |
Sowmini Varadhan | eb19284 | 2016-05-02 11:24:51 -0700 | [diff] [blame] | 128 | if (rs_tcp->t_sock) { |
| 129 | /* Need to resolve a duelling SYN between peers. |
| 130 | * We have an outstanding SYN to this peer, which may |
| 131 | * potentially have transitioned to the RDS_CONN_UP state, |
| 132 | * so we must quiesce any send threads before resetting |
| 133 | * c_transport_data. |
| 134 | */ |
Sowmini Varadhan | c948bb5 | 2016-05-18 10:06:24 -0700 | [diff] [blame] | 135 | if (ntohl(inet->inet_saddr) < ntohl(inet->inet_daddr) || |
| 136 | !conn->c_outgoing) { |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 137 | goto rst_nsk; |
Sowmini Varadhan | c948bb5 | 2016-05-18 10:06:24 -0700 | [diff] [blame] | 138 | } else { |
| 139 | atomic_set(&conn->c_state, RDS_CONN_CONNECTING); |
| 140 | wait_event(conn->c_waitq, |
| 141 | !test_bit(RDS_IN_XMIT, &conn->c_flags)); |
Sowmini Varadhan | eb19284 | 2016-05-02 11:24:51 -0700 | [diff] [blame] | 142 | rds_tcp_restore_callbacks(rs_tcp->t_sock, rs_tcp); |
| 143 | conn->c_outgoing = 0; |
| 144 | } |
| 145 | } |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 146 | rds_tcp_set_callbacks(new_sock, conn); |
Sowmini Varadhan | eb19284 | 2016-05-02 11:24:51 -0700 | [diff] [blame] | 147 | rds_connect_complete(conn); /* marks RDS_CONN_UP */ |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 148 | new_sock = NULL; |
| 149 | ret = 0; |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 150 | goto out; |
| 151 | rst_nsk: |
| 152 | /* reset the newly returned accept sock and bail */ |
| 153 | nsk = new_sock->sk; |
| 154 | rds_tcp_stats_inc(s_tcp_listen_closed_stale); |
| 155 | nsk->sk_user_data = NULL; |
| 156 | nsk->sk_prot->disconnect(nsk, 0); |
| 157 | tcp_done(nsk); |
| 158 | new_sock = NULL; |
| 159 | ret = 0; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 160 | out: |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 161 | if (rs_tcp) |
| 162 | mutex_unlock(&rs_tcp->t_conn_lock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 163 | if (new_sock) |
| 164 | sock_release(new_sock); |
| 165 | return ret; |
| 166 | } |
| 167 | |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 168 | void rds_tcp_listen_data_ready(struct sock *sk) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 169 | { |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 170 | void (*ready)(struct sock *sk); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 171 | |
| 172 | rdsdebug("listen data ready sk %p\n", sk); |
| 173 | |
Eric Dumazet | 3803662 | 2016-05-17 17:44:08 -0700 | [diff] [blame] | 174 | read_lock_bh(&sk->sk_callback_lock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 175 | ready = sk->sk_user_data; |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 176 | if (!ready) { /* check for teardown race */ |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 177 | ready = sk->sk_data_ready; |
| 178 | goto out; |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * ->sk_data_ready is also called for a newly established child socket |
| 183 | * before it has been accepted and the accepter has set up their |
| 184 | * data_ready.. we only want to queue listen work for our listening |
| 185 | * socket |
| 186 | */ |
| 187 | if (sk->sk_state == TCP_LISTEN) |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 188 | rds_tcp_accept_work(sk); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 189 | |
| 190 | out: |
Eric Dumazet | 3803662 | 2016-05-17 17:44:08 -0700 | [diff] [blame] | 191 | read_unlock_bh(&sk->sk_callback_lock); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 192 | ready(sk); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 193 | } |
| 194 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 195 | struct socket *rds_tcp_listen_init(struct net *net) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 196 | { |
| 197 | struct sockaddr_in sin; |
| 198 | struct socket *sock = NULL; |
| 199 | int ret; |
| 200 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 201 | ret = sock_create_kern(net, PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 202 | if (ret < 0) |
| 203 | goto out; |
| 204 | |
Pavel Emelyanov | 4a17fd5 | 2012-04-19 03:39:36 +0000 | [diff] [blame] | 205 | sock->sk->sk_reuse = SK_CAN_REUSE; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 206 | rds_tcp_nonagle(sock); |
| 207 | |
| 208 | write_lock_bh(&sock->sk->sk_callback_lock); |
| 209 | sock->sk->sk_user_data = sock->sk->sk_data_ready; |
| 210 | sock->sk->sk_data_ready = rds_tcp_listen_data_ready; |
| 211 | write_unlock_bh(&sock->sk->sk_callback_lock); |
| 212 | |
Himangi Saraogi | 0172837 | 2014-05-30 21:17:13 +0530 | [diff] [blame] | 213 | sin.sin_family = PF_INET; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 214 | sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); |
| 215 | sin.sin_port = (__force u16)htons(RDS_TCP_PORT); |
| 216 | |
| 217 | ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); |
| 218 | if (ret < 0) |
| 219 | goto out; |
| 220 | |
| 221 | ret = sock->ops->listen(sock, 64); |
| 222 | if (ret < 0) |
| 223 | goto out; |
| 224 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 225 | return sock; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 226 | out: |
| 227 | if (sock) |
| 228 | sock_release(sock); |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 229 | return NULL; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 230 | } |
| 231 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 232 | void rds_tcp_listen_stop(struct socket *sock) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 233 | { |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 234 | struct sock *sk; |
| 235 | |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 236 | if (!sock) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 237 | return; |
| 238 | |
| 239 | sk = sock->sk; |
| 240 | |
| 241 | /* serialize with and prevent further callbacks */ |
| 242 | lock_sock(sk); |
| 243 | write_lock_bh(&sk->sk_callback_lock); |
| 244 | if (sk->sk_user_data) { |
| 245 | sk->sk_data_ready = sk->sk_user_data; |
| 246 | sk->sk_user_data = NULL; |
| 247 | } |
| 248 | write_unlock_bh(&sk->sk_callback_lock); |
| 249 | release_sock(sk); |
| 250 | |
| 251 | /* wait for accepts to stop and close the socket */ |
| 252 | flush_workqueue(rds_wq); |
| 253 | sock_release(sock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 254 | } |