blob: 810a3a49e9474ed643538e41c1d6cb0c21fca396 [file] [log] [blame]
Andy Grover70041082009-08-21 12:28:31 +00001/*
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -07002 * Copyright (c) 2006, 2018 Oracle and/or its affiliates. All rights reserved.
Andy Grover70041082009-08-21 12:28:31 +00003 *
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 Heo5a0e3ad2010-03-24 17:04:11 +090034#include <linux/gfp.h>
Andy Grover70041082009-08-21 12:28:31 +000035#include <linux/in.h>
36#include <net/tcp.h>
37
38#include "rds.h"
39#include "tcp.h"
40
Sowmini Varadhan467fa152015-08-05 01:43:26 -040041int rds_tcp_keepalive(struct socket *sock)
Sowmini Varadhanf711a6a2015-05-05 15:20:51 -040042{
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));
69bail:
70 return ret;
71}
72
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -070073/* 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 */
Santosh Shilimkarbb789762016-12-04 16:41:29 -080082static
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -070083struct rds_tcp_connection *rds_tcp_accept_one_path(struct rds_connection *conn)
84{
85 int i;
Sowmini Varadhan1a0e1002016-11-16 13:29:50 -080086 int npaths = max_t(int, 1, conn->c_npaths);
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -070087
Sowmini Varadhan1a0e1002016-11-16 13:29:50 -080088 /* for mprds, all paths MUST be initiated by the peer
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -070089 * with the smaller address.
90 */
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -070091 if (rds_addr_cmp(&conn->c_faddr, &conn->c_laddr) >= 0) {
Sowmini Varadhan1a0e1002016-11-16 13:29:50 -080092 /* Make sure we initiate at least one path if this
93 * has not already been done; rds_start_mprds() will
94 * take care of additional paths, if necessary.
95 */
96 if (npaths == 1)
97 rds_conn_path_connect_if_down(&conn->c_path[0]);
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -070098 return NULL;
Sowmini Varadhan1a0e1002016-11-16 13:29:50 -080099 }
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -0700100
Sowmini Varadhan117d15b2016-11-04 10:04:12 -0700101 for (i = 0; i < npaths; i++) {
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -0700102 struct rds_conn_path *cp = &conn->c_path[i];
103
104 if (rds_conn_path_transition(cp, RDS_CONN_DOWN,
105 RDS_CONN_CONNECTING) ||
106 rds_conn_path_transition(cp, RDS_CONN_ERROR,
107 RDS_CONN_CONNECTING)) {
108 return cp->cp_transport_data;
109 }
110 }
111 return NULL;
112}
113
Sowmini Varadhanc14b0362017-06-21 13:40:13 -0700114void rds_tcp_set_linger(struct socket *sock)
Sowmini Varadhan10beea72017-06-15 11:28:55 -0700115{
116 struct linger no_linger = {
117 .l_onoff = 1,
118 .l_linger = 0,
119 };
120
121 kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
122 (char *)&no_linger, sizeof(no_linger));
123}
124
Sowmini Varadhan467fa152015-08-05 01:43:26 -0400125int rds_tcp_accept_one(struct socket *sock)
Andy Grover70041082009-08-21 12:28:31 +0000126{
127 struct socket *new_sock = NULL;
128 struct rds_connection *conn;
129 int ret;
130 struct inet_sock *inet;
Sowmini Varadhanbd7c5f92016-05-02 11:24:52 -0700131 struct rds_tcp_connection *rs_tcp = NULL;
132 int conn_state;
Sowmini Varadhanea3b1ea2016-06-30 16:11:14 -0700133 struct rds_conn_path *cp;
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700134 struct in6_addr *my_addr, *peer_addr;
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700135#if !IS_ENABLED(CONFIG_IPV6)
136 struct in6_addr saddr, daddr;
137#endif
138 int dev_if = 0;
Andy Grover70041082009-08-21 12:28:31 +0000139
Sowmini Varadhan37e14f42016-05-18 10:06:23 -0700140 if (!sock) /* module unload or netns delete in progress */
141 return -ENETUNREACH;
142
Sowmini Varadhan0933a572017-07-06 08:15:06 -0700143 ret = sock_create_lite(sock->sk->sk_family,
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -0400144 sock->sk->sk_type, sock->sk->sk_protocol,
145 &new_sock);
Andy Grover70041082009-08-21 12:28:31 +0000146 if (ret)
147 goto out;
148
David Howellscdfbabf2017-03-09 08:09:05 +0000149 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK, true);
Andy Grover70041082009-08-21 12:28:31 +0000150 if (ret < 0)
151 goto out;
152
Ka-Cheong Poon84eef2b2018-03-01 21:07:18 -0800153 /* sock_create_lite() does not get a hold on the owner module so we
154 * need to do it here. Note that sock_release() uses sock->ops to
155 * determine if it needs to decrement the reference count. So set
156 * sock->ops after calling accept() in case that fails. And there's
157 * no need to do try_module_get() as the listener should have a hold
158 * already.
159 */
160 new_sock->ops = sock->ops;
161 __module_get(new_sock->ops->owner);
162
Sowmini Varadhanf711a6a2015-05-05 15:20:51 -0400163 ret = rds_tcp_keepalive(new_sock);
164 if (ret < 0)
165 goto out;
166
Andy Grover70041082009-08-21 12:28:31 +0000167 rds_tcp_tune(new_sock);
168
169 inet = inet_sk(new_sock->sk);
170
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700171#if IS_ENABLED(CONFIG_IPV6)
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700172 my_addr = &new_sock->sk->sk_v6_rcv_saddr;
173 peer_addr = &new_sock->sk->sk_v6_daddr;
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700174#else
175 ipv6_addr_set_v4mapped(inet->inet_saddr, &saddr);
176 ipv6_addr_set_v4mapped(inet->inet_daddr, &daddr);
177 my_addr = &saddr;
178 peer_addr = &daddr;
179#endif
180 rdsdebug("accepted family %d tcp %pI6c:%u -> %pI6c:%u\n",
181 sock->sk->sk_family,
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700182 my_addr, ntohs(inet->inet_sport),
183 peer_addr, ntohs(inet->inet_dport));
Andy Grover70041082009-08-21 12:28:31 +0000184
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700185#if IS_ENABLED(CONFIG_IPV6)
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700186 /* sk_bound_dev_if is not set if the peer address is not link local
187 * address. In this case, it happens that mcast_oif is set. So
188 * just use it.
189 */
190 if ((ipv6_addr_type(my_addr) & IPV6_ADDR_LINKLOCAL) &&
191 !(ipv6_addr_type(peer_addr) & IPV6_ADDR_LINKLOCAL)) {
192 struct ipv6_pinfo *inet6;
193
194 inet6 = inet6_sk(new_sock->sk);
195 dev_if = inet6->mcast_oif;
196 } else {
197 dev_if = new_sock->sk->sk_bound_dev_if;
198 }
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700199#endif
200
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -0400201 conn = rds_conn_create(sock_net(sock->sk),
Ka-Cheong Poone65d4d92018-07-30 22:48:42 -0700202 my_addr, peer_addr,
Santosh Shilimkar3eb45032018-10-23 23:21:14 -0400203 &rds_tcp_transport, 0, GFP_KERNEL, dev_if);
Ka-Cheong Pooneee2fa62018-07-23 20:51:21 -0700204
Andy Grover70041082009-08-21 12:28:31 +0000205 if (IS_ERR(conn)) {
206 ret = PTR_ERR(conn);
207 goto out;
208 }
Sowmini Varadhanf711a6a2015-05-05 15:20:51 -0400209 /* An incoming SYN request came in, and TCP just accepted it.
Sowmini Varadhanf711a6a2015-05-05 15:20:51 -0400210 *
211 * If the client reboots, this conn will need to be cleaned up.
212 * rds_tcp_state_change() will do that cleanup
213 */
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -0700214 rs_tcp = rds_tcp_accept_one_path(conn);
215 if (!rs_tcp)
216 goto rst_nsk;
Sowmini Varadhan02105b22016-06-30 16:11:12 -0700217 mutex_lock(&rs_tcp->t_conn_path_lock);
Sowmini Varadhan5916e2c2016-07-14 03:51:03 -0700218 cp = rs_tcp->t_cpath;
219 conn_state = rds_conn_path_state(cp);
Sowmini Varadhan1a0e1002016-11-16 13:29:50 -0800220 WARN_ON(conn_state == RDS_CONN_UP);
221 if (conn_state != RDS_CONN_CONNECTING && conn_state != RDS_CONN_ERROR)
Sowmini Varadhanbd7c5f92016-05-02 11:24:52 -0700222 goto rst_nsk;
Sowmini Varadhaneb192842016-05-02 11:24:51 -0700223 if (rs_tcp->t_sock) {
Sowmini Varadhan41500c32017-06-15 11:28:53 -0700224 /* Duelling SYN has been handled in rds_tcp_accept_one() */
225 rds_tcp_reset_callbacks(new_sock, cp);
226 /* rds_connect_path_complete() marks RDS_CONN_UP */
227 rds_connect_path_complete(cp, RDS_CONN_RESETTING);
Sowmini Varadhan335b48d2016-06-04 13:59:58 -0700228 } else {
Sowmini Varadhanea3b1ea2016-06-30 16:11:14 -0700229 rds_tcp_set_callbacks(new_sock, cp);
230 rds_connect_path_complete(cp, RDS_CONN_CONNECTING);
Sowmini Varadhaneb192842016-05-02 11:24:51 -0700231 }
Andy Grover70041082009-08-21 12:28:31 +0000232 new_sock = NULL;
233 ret = 0;
Sowmini Varadhan69b92b52017-06-21 13:40:12 -0700234 if (conn->c_npaths == 0)
235 rds_send_ping(cp->cp_conn, cp->cp_index);
Sowmini Varadhanbd7c5f92016-05-02 11:24:52 -0700236 goto out;
237rst_nsk:
Sowmini Varadhan10beea72017-06-15 11:28:55 -0700238 /* reset the newly returned accept sock and bail.
239 * It is safe to set linger on new_sock because the RDS connection
240 * has not been brought up on new_sock, so no RDS-level data could
241 * be pending on it. By setting linger, we achieve the side-effect
242 * of avoiding TIME_WAIT state on new_sock.
243 */
244 rds_tcp_set_linger(new_sock);
Sowmini Varadhan335b48d2016-06-04 13:59:58 -0700245 kernel_sock_shutdown(new_sock, SHUT_RDWR);
Sowmini Varadhanbd7c5f92016-05-02 11:24:52 -0700246 ret = 0;
Andy Grover70041082009-08-21 12:28:31 +0000247out:
Sowmini Varadhanbd7c5f92016-05-02 11:24:52 -0700248 if (rs_tcp)
Sowmini Varadhan02105b22016-06-30 16:11:12 -0700249 mutex_unlock(&rs_tcp->t_conn_path_lock);
Andy Grover70041082009-08-21 12:28:31 +0000250 if (new_sock)
251 sock_release(new_sock);
252 return ret;
253}
254
David S. Miller676d2362014-04-11 16:15:36 -0400255void rds_tcp_listen_data_ready(struct sock *sk)
Andy Grover70041082009-08-21 12:28:31 +0000256{
David S. Miller676d2362014-04-11 16:15:36 -0400257 void (*ready)(struct sock *sk);
Andy Grover70041082009-08-21 12:28:31 +0000258
259 rdsdebug("listen data ready sk %p\n", sk);
260
Eric Dumazet38036622016-05-17 17:44:08 -0700261 read_lock_bh(&sk->sk_callback_lock);
Andy Grover70041082009-08-21 12:28:31 +0000262 ready = sk->sk_user_data;
Andy Grover8690bfa2010-01-12 11:56:44 -0800263 if (!ready) { /* check for teardown race */
Andy Grover70041082009-08-21 12:28:31 +0000264 ready = sk->sk_data_ready;
265 goto out;
266 }
267
268 /*
269 * ->sk_data_ready is also called for a newly established child socket
270 * before it has been accepted and the accepter has set up their
271 * data_ready.. we only want to queue listen work for our listening
272 * socket
Sowmini Varadhanb21dd452017-03-04 08:57:35 -0800273 *
274 * (*ready)() may be null if we are racing with netns delete, and
275 * the listen socket is being torn down.
Andy Grover70041082009-08-21 12:28:31 +0000276 */
277 if (sk->sk_state == TCP_LISTEN)
Sowmini Varadhan467fa152015-08-05 01:43:26 -0400278 rds_tcp_accept_work(sk);
Sowmini Varadhana93d01f2016-07-14 03:51:01 -0700279 else
280 ready = rds_tcp_listen_sock_def_readable(sock_net(sk));
Andy Grover70041082009-08-21 12:28:31 +0000281
282out:
Eric Dumazet38036622016-05-17 17:44:08 -0700283 read_unlock_bh(&sk->sk_callback_lock);
Sowmini Varadhanb21dd452017-03-04 08:57:35 -0800284 if (ready)
285 ready(sk);
Andy Grover70041082009-08-21 12:28:31 +0000286}
287
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700288struct socket *rds_tcp_listen_init(struct net *net, bool isv6)
Andy Grover70041082009-08-21 12:28:31 +0000289{
Andy Grover70041082009-08-21 12:28:31 +0000290 struct socket *sock = NULL;
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700291 struct sockaddr_storage ss;
292 struct sockaddr_in6 *sin6;
293 struct sockaddr_in *sin;
294 int addr_len;
Andy Grover70041082009-08-21 12:28:31 +0000295 int ret;
296
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700297 ret = sock_create_kern(net, isv6 ? PF_INET6 : PF_INET, SOCK_STREAM,
298 IPPROTO_TCP, &sock);
299 if (ret < 0) {
300 rdsdebug("could not create %s listener socket: %d\n",
301 isv6 ? "IPv6" : "IPv4", ret);
Andy Grover70041082009-08-21 12:28:31 +0000302 goto out;
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700303 }
Andy Grover70041082009-08-21 12:28:31 +0000304
Pavel Emelyanov4a17fd52012-04-19 03:39:36 +0000305 sock->sk->sk_reuse = SK_CAN_REUSE;
Andy Grover70041082009-08-21 12:28:31 +0000306 rds_tcp_nonagle(sock);
307
308 write_lock_bh(&sock->sk->sk_callback_lock);
309 sock->sk->sk_user_data = sock->sk->sk_data_ready;
310 sock->sk->sk_data_ready = rds_tcp_listen_data_ready;
311 write_unlock_bh(&sock->sk->sk_callback_lock);
312
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700313 if (isv6) {
314 sin6 = (struct sockaddr_in6 *)&ss;
315 sin6->sin6_family = PF_INET6;
316 sin6->sin6_addr = in6addr_any;
317 sin6->sin6_port = (__force u16)htons(RDS_TCP_PORT);
318 sin6->sin6_scope_id = 0;
319 sin6->sin6_flowinfo = 0;
320 addr_len = sizeof(*sin6);
321 } else {
322 sin = (struct sockaddr_in *)&ss;
323 sin->sin_family = PF_INET;
324 sin->sin_addr.s_addr = INADDR_ANY;
325 sin->sin_port = (__force u16)htons(RDS_TCP_PORT);
326 addr_len = sizeof(*sin);
327 }
Andy Grover70041082009-08-21 12:28:31 +0000328
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700329 ret = sock->ops->bind(sock, (struct sockaddr *)&ss, addr_len);
330 if (ret < 0) {
331 rdsdebug("could not bind %s listener socket: %d\n",
332 isv6 ? "IPv6" : "IPv4", ret);
Andy Grover70041082009-08-21 12:28:31 +0000333 goto out;
Ka-Cheong Poon1e2b44e2018-07-23 20:51:22 -0700334 }
Andy Grover70041082009-08-21 12:28:31 +0000335
336 ret = sock->ops->listen(sock, 64);
337 if (ret < 0)
338 goto out;
339
Sowmini Varadhan467fa152015-08-05 01:43:26 -0400340 return sock;
Andy Grover70041082009-08-21 12:28:31 +0000341out:
342 if (sock)
343 sock_release(sock);
Sowmini Varadhan467fa152015-08-05 01:43:26 -0400344 return NULL;
Andy Grover70041082009-08-21 12:28:31 +0000345}
346
Sowmini Varadhanb21dd452017-03-04 08:57:35 -0800347void rds_tcp_listen_stop(struct socket *sock, struct work_struct *acceptor)
Andy Grover70041082009-08-21 12:28:31 +0000348{
Andy Grover70041082009-08-21 12:28:31 +0000349 struct sock *sk;
350
Andy Grover8690bfa2010-01-12 11:56:44 -0800351 if (!sock)
Andy Grover70041082009-08-21 12:28:31 +0000352 return;
353
354 sk = sock->sk;
355
356 /* serialize with and prevent further callbacks */
357 lock_sock(sk);
358 write_lock_bh(&sk->sk_callback_lock);
359 if (sk->sk_user_data) {
360 sk->sk_data_ready = sk->sk_user_data;
361 sk->sk_user_data = NULL;
362 }
363 write_unlock_bh(&sk->sk_callback_lock);
364 release_sock(sk);
365
366 /* wait for accepts to stop and close the socket */
367 flush_workqueue(rds_wq);
Sowmini Varadhanb21dd452017-03-04 08:57:35 -0800368 flush_work(acceptor);
Andy Grover70041082009-08-21 12:28:31 +0000369 sock_release(sock);
Andy Grover70041082009-08-21 12:28:31 +0000370}