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 | 5916e2c | 2016-07-14 03:51:03 -0700 | [diff] [blame] | 73 | /* rds_tcp_accept_one_path(): if accepting on cp_index > 0, make sure the |
| 74 | * client's ipaddr < server's ipaddr. Otherwise, close the accepted |
| 75 | * socket and force a reconneect from smaller -> larger ip addr. The reason |
| 76 | * we special case cp_index 0 is to allow the rds probe ping itself to itself |
| 77 | * get through efficiently. |
| 78 | * Since reconnects are only initiated from the node with the numerically |
| 79 | * smaller ip address, we recycle conns in RDS_CONN_ERROR on the passive side |
| 80 | * by moving them to CONNECTING in this function. |
| 81 | */ |
| 82 | struct rds_tcp_connection *rds_tcp_accept_one_path(struct rds_connection *conn) |
| 83 | { |
| 84 | int i; |
| 85 | bool peer_is_smaller = (conn->c_faddr < conn->c_laddr); |
| 86 | int npaths = conn->c_npaths; |
| 87 | |
| 88 | if (npaths <= 1) { |
| 89 | struct rds_conn_path *cp = &conn->c_path[0]; |
| 90 | int ret; |
| 91 | |
| 92 | ret = rds_conn_path_transition(cp, RDS_CONN_DOWN, |
| 93 | RDS_CONN_CONNECTING); |
| 94 | if (!ret) |
| 95 | rds_conn_path_transition(cp, RDS_CONN_ERROR, |
| 96 | RDS_CONN_CONNECTING); |
| 97 | return cp->cp_transport_data; |
| 98 | } |
| 99 | |
| 100 | /* for mprds, paths with cp_index > 0 MUST be initiated by the peer |
| 101 | * with the smaller address. |
| 102 | */ |
| 103 | if (!peer_is_smaller) |
| 104 | return NULL; |
| 105 | |
| 106 | for (i = 1; i < npaths; i++) { |
| 107 | struct rds_conn_path *cp = &conn->c_path[i]; |
| 108 | |
| 109 | if (rds_conn_path_transition(cp, RDS_CONN_DOWN, |
| 110 | RDS_CONN_CONNECTING) || |
| 111 | rds_conn_path_transition(cp, RDS_CONN_ERROR, |
| 112 | RDS_CONN_CONNECTING)) { |
| 113 | return cp->cp_transport_data; |
| 114 | } |
| 115 | } |
| 116 | return NULL; |
| 117 | } |
| 118 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 119 | int rds_tcp_accept_one(struct socket *sock) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 120 | { |
| 121 | struct socket *new_sock = NULL; |
| 122 | struct rds_connection *conn; |
| 123 | int ret; |
| 124 | struct inet_sock *inet; |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 125 | struct rds_tcp_connection *rs_tcp = NULL; |
| 126 | int conn_state; |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 127 | struct rds_conn_path *cp; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 128 | |
Sowmini Varadhan | 37e14f4 | 2016-05-18 10:06:23 -0700 | [diff] [blame] | 129 | if (!sock) /* module unload or netns delete in progress */ |
| 130 | return -ENETUNREACH; |
| 131 | |
Sowmini Varadhan | d5a8ac2 | 2015-08-05 01:43:25 -0400 | [diff] [blame] | 132 | ret = sock_create_kern(sock_net(sock->sk), sock->sk->sk_family, |
| 133 | sock->sk->sk_type, sock->sk->sk_protocol, |
| 134 | &new_sock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 135 | if (ret) |
| 136 | goto out; |
| 137 | |
| 138 | new_sock->type = sock->type; |
| 139 | new_sock->ops = sock->ops; |
| 140 | ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); |
| 141 | if (ret < 0) |
| 142 | goto out; |
| 143 | |
Sowmini Varadhan | f711a6a | 2015-05-05 15:20:51 -0400 | [diff] [blame] | 144 | ret = rds_tcp_keepalive(new_sock); |
| 145 | if (ret < 0) |
| 146 | goto out; |
| 147 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 148 | rds_tcp_tune(new_sock); |
| 149 | |
| 150 | inet = inet_sk(new_sock->sk); |
| 151 | |
Joe Perches | 6884b34 | 2010-02-02 12:43:59 +0000 | [diff] [blame] | 152 | rdsdebug("accepted tcp %pI4:%u -> %pI4:%u\n", |
| 153 | &inet->inet_saddr, ntohs(inet->inet_sport), |
| 154 | &inet->inet_daddr, ntohs(inet->inet_dport)); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 155 | |
Sowmini Varadhan | d5a8ac2 | 2015-08-05 01:43:25 -0400 | [diff] [blame] | 156 | conn = rds_conn_create(sock_net(sock->sk), |
| 157 | inet->inet_saddr, inet->inet_daddr, |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 158 | &rds_tcp_transport, GFP_KERNEL); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 159 | if (IS_ERR(conn)) { |
| 160 | ret = PTR_ERR(conn); |
| 161 | goto out; |
| 162 | } |
Sowmini Varadhan | f711a6a | 2015-05-05 15:20:51 -0400 | [diff] [blame] | 163 | /* An incoming SYN request came in, and TCP just accepted it. |
Sowmini Varadhan | f711a6a | 2015-05-05 15:20:51 -0400 | [diff] [blame] | 164 | * |
| 165 | * If the client reboots, this conn will need to be cleaned up. |
| 166 | * rds_tcp_state_change() will do that cleanup |
| 167 | */ |
Sowmini Varadhan | 5916e2c | 2016-07-14 03:51:03 -0700 | [diff] [blame] | 168 | rs_tcp = rds_tcp_accept_one_path(conn); |
| 169 | if (!rs_tcp) |
| 170 | goto rst_nsk; |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 171 | mutex_lock(&rs_tcp->t_conn_path_lock); |
Sowmini Varadhan | 5916e2c | 2016-07-14 03:51:03 -0700 | [diff] [blame] | 172 | cp = rs_tcp->t_cpath; |
| 173 | conn_state = rds_conn_path_state(cp); |
| 174 | if (conn_state != RDS_CONN_CONNECTING && conn_state != RDS_CONN_UP && |
| 175 | conn_state != RDS_CONN_ERROR) |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 176 | goto rst_nsk; |
Sowmini Varadhan | eb19284 | 2016-05-02 11:24:51 -0700 | [diff] [blame] | 177 | if (rs_tcp->t_sock) { |
| 178 | /* Need to resolve a duelling SYN between peers. |
| 179 | * We have an outstanding SYN to this peer, which may |
| 180 | * potentially have transitioned to the RDS_CONN_UP state, |
| 181 | * so we must quiesce any send threads before resetting |
| 182 | * c_transport_data. |
| 183 | */ |
Sowmini Varadhan | c948bb5 | 2016-05-18 10:06:24 -0700 | [diff] [blame] | 184 | if (ntohl(inet->inet_saddr) < ntohl(inet->inet_daddr) || |
Sowmini Varadhan | 5916e2c | 2016-07-14 03:51:03 -0700 | [diff] [blame] | 185 | !cp->cp_outgoing) { |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 186 | goto rst_nsk; |
Sowmini Varadhan | c948bb5 | 2016-05-18 10:06:24 -0700 | [diff] [blame] | 187 | } else { |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 188 | rds_tcp_reset_callbacks(new_sock, cp); |
Sowmini Varadhan | 5916e2c | 2016-07-14 03:51:03 -0700 | [diff] [blame] | 189 | cp->cp_outgoing = 0; |
Sowmini Varadhan | 9c79440 | 2016-06-04 14:00:00 -0700 | [diff] [blame] | 190 | /* rds_connect_path_complete() marks RDS_CONN_UP */ |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 191 | rds_connect_path_complete(cp, RDS_CONN_RESETTING); |
Sowmini Varadhan | eb19284 | 2016-05-02 11:24:51 -0700 | [diff] [blame] | 192 | } |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 193 | } else { |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 194 | rds_tcp_set_callbacks(new_sock, cp); |
| 195 | rds_connect_path_complete(cp, RDS_CONN_CONNECTING); |
Sowmini Varadhan | eb19284 | 2016-05-02 11:24:51 -0700 | [diff] [blame] | 196 | } |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 197 | new_sock = NULL; |
| 198 | ret = 0; |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 199 | goto out; |
| 200 | rst_nsk: |
| 201 | /* reset the newly returned accept sock and bail */ |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 202 | kernel_sock_shutdown(new_sock, SHUT_RDWR); |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 203 | ret = 0; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 204 | out: |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame] | 205 | if (rs_tcp) |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 206 | mutex_unlock(&rs_tcp->t_conn_path_lock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 207 | if (new_sock) |
| 208 | sock_release(new_sock); |
| 209 | return ret; |
| 210 | } |
| 211 | |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 212 | void rds_tcp_listen_data_ready(struct sock *sk) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 213 | { |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 214 | void (*ready)(struct sock *sk); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 215 | |
| 216 | rdsdebug("listen data ready sk %p\n", sk); |
| 217 | |
Eric Dumazet | 3803662 | 2016-05-17 17:44:08 -0700 | [diff] [blame] | 218 | read_lock_bh(&sk->sk_callback_lock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 219 | ready = sk->sk_user_data; |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 220 | if (!ready) { /* check for teardown race */ |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 221 | ready = sk->sk_data_ready; |
| 222 | goto out; |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * ->sk_data_ready is also called for a newly established child socket |
| 227 | * before it has been accepted and the accepter has set up their |
| 228 | * data_ready.. we only want to queue listen work for our listening |
| 229 | * socket |
| 230 | */ |
| 231 | if (sk->sk_state == TCP_LISTEN) |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 232 | rds_tcp_accept_work(sk); |
Sowmini Varadhan | a93d01f | 2016-07-14 03:51:01 -0700 | [diff] [blame] | 233 | else |
| 234 | ready = rds_tcp_listen_sock_def_readable(sock_net(sk)); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 235 | |
| 236 | out: |
Eric Dumazet | 3803662 | 2016-05-17 17:44:08 -0700 | [diff] [blame] | 237 | read_unlock_bh(&sk->sk_callback_lock); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 238 | ready(sk); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 239 | } |
| 240 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 241 | struct socket *rds_tcp_listen_init(struct net *net) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 242 | { |
| 243 | struct sockaddr_in sin; |
| 244 | struct socket *sock = NULL; |
| 245 | int ret; |
| 246 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 247 | ret = sock_create_kern(net, PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 248 | if (ret < 0) |
| 249 | goto out; |
| 250 | |
Pavel Emelyanov | 4a17fd5 | 2012-04-19 03:39:36 +0000 | [diff] [blame] | 251 | sock->sk->sk_reuse = SK_CAN_REUSE; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 252 | rds_tcp_nonagle(sock); |
| 253 | |
| 254 | write_lock_bh(&sock->sk->sk_callback_lock); |
| 255 | sock->sk->sk_user_data = sock->sk->sk_data_ready; |
| 256 | sock->sk->sk_data_ready = rds_tcp_listen_data_ready; |
| 257 | write_unlock_bh(&sock->sk->sk_callback_lock); |
| 258 | |
Himangi Saraogi | 0172837 | 2014-05-30 21:17:13 +0530 | [diff] [blame] | 259 | sin.sin_family = PF_INET; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 260 | sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); |
| 261 | sin.sin_port = (__force u16)htons(RDS_TCP_PORT); |
| 262 | |
| 263 | ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); |
| 264 | if (ret < 0) |
| 265 | goto out; |
| 266 | |
| 267 | ret = sock->ops->listen(sock, 64); |
| 268 | if (ret < 0) |
| 269 | goto out; |
| 270 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 271 | return sock; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 272 | out: |
| 273 | if (sock) |
| 274 | sock_release(sock); |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 275 | return NULL; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 276 | } |
| 277 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 278 | void rds_tcp_listen_stop(struct socket *sock) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 279 | { |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 280 | struct sock *sk; |
| 281 | |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 282 | if (!sock) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 283 | return; |
| 284 | |
| 285 | sk = sock->sk; |
| 286 | |
| 287 | /* serialize with and prevent further callbacks */ |
| 288 | lock_sock(sk); |
| 289 | write_lock_bh(&sk->sk_callback_lock); |
| 290 | if (sk->sk_user_data) { |
| 291 | sk->sk_data_ready = sk->sk_user_data; |
| 292 | sk->sk_user_data = NULL; |
| 293 | } |
| 294 | write_unlock_bh(&sk->sk_callback_lock); |
| 295 | release_sock(sk); |
| 296 | |
| 297 | /* wait for accepts to stop and close the socket */ |
| 298 | flush_workqueue(rds_wq); |
| 299 | sock_release(sock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 300 | } |