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c5fa7b3c YX |
1 | /* |
2 | * net/tipc/server.c: TIPC server infrastructure | |
3 | * | |
4 | * Copyright (c) 2012-2013, Wind River Systems | |
026321c6 | 5 | * Copyright (c) 2017-2018, Ericsson AB |
c5fa7b3c YX |
6 | * All rights reserved. |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions are met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
19 | * | |
20 | * Alternatively, this software may be distributed under the terms of the | |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
34 | * POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
36 | ||
c901d26d | 37 | #include "subscr.h" |
026321c6 | 38 | #include "topsrv.h" |
c5fa7b3c | 39 | #include "core.h" |
859fc7c0 | 40 | #include "socket.h" |
14c04493 JM |
41 | #include "addr.h" |
42 | #include "msg.h" | |
6c9081a3 | 43 | #include "bearer.h" |
c5fa7b3c | 44 | #include <net/sock.h> |
76100a8a | 45 | #include <linux/module.h> |
c5fa7b3c YX |
46 | |
47 | /* Number of messages to send before rescheduling */ | |
48 | #define MAX_SEND_MSG_COUNT 25 | |
49 | #define MAX_RECV_MSG_COUNT 25 | |
50 | #define CF_CONNECTED 1 | |
76100a8a | 51 | #define CF_SERVER 2 |
c5fa7b3c | 52 | |
5c45ab24 JM |
53 | #define TIPC_SERVER_NAME_LEN 32 |
54 | ||
55 | /** | |
026321c6 | 56 | * struct tipc_topsrv - TIPC server structure |
5c45ab24 JM |
57 | * @conn_idr: identifier set of connection |
58 | * @idr_lock: protect the connection identifier set | |
59 | * @idr_in_use: amount of allocated identifier entry | |
60 | * @net: network namspace instance | |
05a6843c | 61 | * @awork: accept work item |
5c45ab24 JM |
62 | * @rcv_wq: receive workqueue |
63 | * @send_wq: send workqueue | |
05a6843c | 64 | * @listener: topsrv listener socket |
5c45ab24 | 65 | * @name: server name |
5c45ab24 | 66 | */ |
026321c6 | 67 | struct tipc_topsrv { |
5c45ab24 JM |
68 | struct idr conn_idr; |
69 | spinlock_t idr_lock; /* for idr list */ | |
70 | int idr_in_use; | |
71 | struct net *net; | |
0ef897be | 72 | struct work_struct awork; |
5c45ab24 JM |
73 | struct workqueue_struct *rcv_wq; |
74 | struct workqueue_struct *send_wq; | |
0ef897be | 75 | struct socket *listener; |
5c45ab24 JM |
76 | char name[TIPC_SERVER_NAME_LEN]; |
77 | }; | |
c5fa7b3c YX |
78 | |
79 | /** | |
80 | * struct tipc_conn - TIPC connection structure | |
81 | * @kref: reference counter to connection object | |
82 | * @conid: connection identifier | |
83 | * @sock: socket handler associated with connection | |
84 | * @flags: indicates connection state | |
85 | * @server: pointer to connected server | |
df79d040 JM |
86 | * @sub_list: lsit to all pertaing subscriptions |
87 | * @sub_lock: lock protecting the subscription list | |
c5fa7b3c | 88 | * @rwork: receive work item |
c5fa7b3c | 89 | * @outqueue: pointer to first outbound message in queue |
963a1855 | 90 | * @outqueue_lock: control access to the outqueue |
c5fa7b3c YX |
91 | * @swork: send work item |
92 | */ | |
93 | struct tipc_conn { | |
94 | struct kref kref; | |
95 | int conid; | |
96 | struct socket *sock; | |
97 | unsigned long flags; | |
026321c6 | 98 | struct tipc_topsrv *server; |
df79d040 JM |
99 | struct list_head sub_list; |
100 | spinlock_t sub_lock; /* for subscription list */ | |
c5fa7b3c | 101 | struct work_struct rwork; |
c5fa7b3c | 102 | struct list_head outqueue; |
026321c6 | 103 | spinlock_t outqueue_lock; /* for outqueue */ |
c5fa7b3c YX |
104 | struct work_struct swork; |
105 | }; | |
106 | ||
107 | /* An entry waiting to be sent */ | |
108 | struct outqueue_entry { | |
414574a0 JM |
109 | bool inactive; |
110 | struct tipc_event evt; | |
c5fa7b3c | 111 | struct list_head list; |
c5fa7b3c YX |
112 | }; |
113 | ||
026321c6 JM |
114 | static void tipc_conn_recv_work(struct work_struct *work); |
115 | static void tipc_conn_send_work(struct work_struct *work); | |
116 | static void tipc_topsrv_kern_evt(struct net *net, struct tipc_event *evt); | |
117 | static void tipc_conn_delete_sub(struct tipc_conn *con, struct tipc_subscr *s); | |
5c45ab24 | 118 | |
df79d040 JM |
119 | static bool connected(struct tipc_conn *con) |
120 | { | |
121 | return con && test_bit(CF_CONNECTED, &con->flags); | |
122 | } | |
123 | ||
c5fa7b3c YX |
124 | static void tipc_conn_kref_release(struct kref *kref) |
125 | { | |
126 | struct tipc_conn *con = container_of(kref, struct tipc_conn, kref); | |
026321c6 | 127 | struct tipc_topsrv *s = con->server; |
0ef897be | 128 | struct outqueue_entry *e, *safe; |
76100a8a | 129 | |
14c04493 JM |
130 | spin_lock_bh(&s->idr_lock); |
131 | idr_remove(&s->conn_idr, con->conid); | |
132 | s->idr_in_use--; | |
133 | spin_unlock_bh(&s->idr_lock); | |
0ef897be JM |
134 | if (con->sock) |
135 | sock_release(con->sock); | |
136 | ||
137 | spin_lock_bh(&con->outqueue_lock); | |
138 | list_for_each_entry_safe(e, safe, &con->outqueue, list) { | |
139 | list_del(&e->list); | |
140 | kfree(e); | |
141 | } | |
142 | spin_unlock_bh(&con->outqueue_lock); | |
c5fa7b3c YX |
143 | kfree(con); |
144 | } | |
145 | ||
146 | static void conn_put(struct tipc_conn *con) | |
147 | { | |
148 | kref_put(&con->kref, tipc_conn_kref_release); | |
149 | } | |
150 | ||
151 | static void conn_get(struct tipc_conn *con) | |
152 | { | |
153 | kref_get(&con->kref); | |
154 | } | |
155 | ||
026321c6 | 156 | static void tipc_conn_close(struct tipc_conn *con) |
333f7962 | 157 | { |
e88f2be8 JM |
158 | struct sock *sk = con->sock->sk; |
159 | bool disconnect = false; | |
333f7962 | 160 | |
e88f2be8 JM |
161 | write_lock_bh(&sk->sk_callback_lock); |
162 | disconnect = test_and_clear_bit(CF_CONNECTED, &con->flags); | |
df79d040 | 163 | |
e88f2be8 JM |
164 | if (disconnect) { |
165 | sk->sk_user_data = NULL; | |
026321c6 | 166 | tipc_conn_delete_sub(con, NULL); |
c5fa7b3c | 167 | } |
e88f2be8 JM |
168 | write_unlock_bh(&sk->sk_callback_lock); |
169 | ||
170 | /* Handle concurrent calls from sending and receiving threads */ | |
171 | if (!disconnect) | |
172 | return; | |
173 | ||
174 | /* Don't flush pending works, -just let them expire */ | |
175 | kernel_sock_shutdown(con->sock, SHUT_RDWR); | |
0ef897be | 176 | |
e88f2be8 | 177 | conn_put(con); |
c5fa7b3c YX |
178 | } |
179 | ||
026321c6 | 180 | static struct tipc_conn *tipc_conn_alloc(struct tipc_topsrv *s) |
c5fa7b3c YX |
181 | { |
182 | struct tipc_conn *con; | |
183 | int ret; | |
184 | ||
026321c6 | 185 | con = kzalloc(sizeof(*con), GFP_ATOMIC); |
c5fa7b3c YX |
186 | if (!con) |
187 | return ERR_PTR(-ENOMEM); | |
188 | ||
189 | kref_init(&con->kref); | |
190 | INIT_LIST_HEAD(&con->outqueue); | |
df79d040 | 191 | INIT_LIST_HEAD(&con->sub_list); |
c5fa7b3c | 192 | spin_lock_init(&con->outqueue_lock); |
df79d040 | 193 | spin_lock_init(&con->sub_lock); |
026321c6 JM |
194 | INIT_WORK(&con->swork, tipc_conn_send_work); |
195 | INIT_WORK(&con->rwork, tipc_conn_recv_work); | |
c5fa7b3c YX |
196 | |
197 | spin_lock_bh(&s->idr_lock); | |
198 | ret = idr_alloc(&s->conn_idr, con, 0, 0, GFP_ATOMIC); | |
199 | if (ret < 0) { | |
200 | kfree(con); | |
201 | spin_unlock_bh(&s->idr_lock); | |
202 | return ERR_PTR(-ENOMEM); | |
203 | } | |
204 | con->conid = ret; | |
205 | s->idr_in_use++; | |
206 | spin_unlock_bh(&s->idr_lock); | |
207 | ||
208 | set_bit(CF_CONNECTED, &con->flags); | |
209 | con->server = s; | |
210 | ||
211 | return con; | |
212 | } | |
213 | ||
026321c6 | 214 | static struct tipc_conn *tipc_conn_lookup(struct tipc_topsrv *s, int conid) |
df79d040 | 215 | { |
026321c6 JM |
216 | struct tipc_conn *con; |
217 | ||
218 | spin_lock_bh(&s->idr_lock); | |
219 | con = idr_find(&s->conn_idr, conid); | |
220 | if (!connected(con) || !kref_get_unless_zero(&con->kref)) | |
221 | con = NULL; | |
222 | spin_unlock_bh(&s->idr_lock); | |
223 | return con; | |
224 | } | |
225 | ||
226 | /* tipc_conn_delete_sub - delete a specific or all subscriptions | |
227 | * for a given subscriber | |
228 | */ | |
229 | static void tipc_conn_delete_sub(struct tipc_conn *con, struct tipc_subscr *s) | |
230 | { | |
231 | struct tipc_net *tn = tipc_net(con->server->net); | |
232 | struct list_head *sub_list = &con->sub_list; | |
233 | struct tipc_subscription *sub, *tmp; | |
df79d040 | 234 | |
df79d040 | 235 | spin_lock_bh(&con->sub_lock); |
026321c6 JM |
236 | list_for_each_entry_safe(sub, tmp, sub_list, sub_list) { |
237 | if (!s || !memcmp(s, &sub->evt.s, sizeof(*s))) { | |
238 | tipc_sub_unsubscribe(sub); | |
239 | atomic_dec(&tn->subscription_count); | |
240 | } else if (s) { | |
241 | break; | |
242 | } | |
243 | } | |
df79d040 | 244 | spin_unlock_bh(&con->sub_lock); |
df79d040 JM |
245 | } |
246 | ||
026321c6 | 247 | static void tipc_conn_send_to_sock(struct tipc_conn *con) |
c5fa7b3c | 248 | { |
026321c6 JM |
249 | struct list_head *queue = &con->outqueue; |
250 | struct tipc_topsrv *srv = con->server; | |
251 | struct outqueue_entry *e; | |
252 | struct tipc_event *evt; | |
253 | struct msghdr msg; | |
c5fa7b3c | 254 | struct kvec iov; |
026321c6 | 255 | int count = 0; |
c5fa7b3c YX |
256 | int ret; |
257 | ||
026321c6 JM |
258 | spin_lock_bh(&con->outqueue_lock); |
259 | ||
260 | while (!list_empty(queue)) { | |
261 | e = list_first_entry(queue, struct outqueue_entry, list); | |
262 | evt = &e->evt; | |
263 | spin_unlock_bh(&con->outqueue_lock); | |
264 | ||
265 | if (e->inactive) | |
266 | tipc_conn_delete_sub(con, &evt->s); | |
267 | ||
268 | memset(&msg, 0, sizeof(msg)); | |
269 | msg.msg_flags = MSG_DONTWAIT; | |
270 | iov.iov_base = evt; | |
271 | iov.iov_len = sizeof(*evt); | |
272 | msg.msg_name = NULL; | |
273 | ||
274 | if (con->sock) { | |
275 | ret = kernel_sendmsg(con->sock, &msg, &iov, | |
276 | 1, sizeof(*evt)); | |
277 | if (ret == -EWOULDBLOCK || ret == 0) { | |
278 | cond_resched(); | |
279 | return; | |
280 | } else if (ret < 0) { | |
281 | return tipc_conn_close(con); | |
282 | } | |
283 | } else { | |
284 | tipc_topsrv_kern_evt(srv->net, evt); | |
285 | } | |
286 | ||
287 | /* Don't starve users filling buffers */ | |
288 | if (++count >= MAX_SEND_MSG_COUNT) { | |
289 | cond_resched(); | |
290 | count = 0; | |
291 | } | |
292 | spin_lock_bh(&con->outqueue_lock); | |
293 | list_del(&e->list); | |
294 | kfree(e); | |
c5fa7b3c | 295 | } |
026321c6 JM |
296 | spin_unlock_bh(&con->outqueue_lock); |
297 | } | |
c5fa7b3c | 298 | |
026321c6 JM |
299 | static void tipc_conn_send_work(struct work_struct *work) |
300 | { | |
301 | struct tipc_conn *con = container_of(work, struct tipc_conn, swork); | |
302 | ||
303 | if (connected(con)) | |
304 | tipc_conn_send_to_sock(con); | |
305 | ||
306 | conn_put(con); | |
c5fa7b3c YX |
307 | } |
308 | ||
a484ef34 ZG |
309 | /* tipc_topsrv_queue_evt() - interrupt level call from a subscription instance |
310 | * The queued work is launched into tipc_conn_send_work()->tipc_conn_send_to_sock() | |
414574a0 | 311 | */ |
026321c6 JM |
312 | void tipc_topsrv_queue_evt(struct net *net, int conid, |
313 | u32 event, struct tipc_event *evt) | |
c5fa7b3c | 314 | { |
026321c6 | 315 | struct tipc_topsrv *srv = tipc_topsrv(net); |
c5fa7b3c YX |
316 | struct outqueue_entry *e; |
317 | struct tipc_conn *con; | |
318 | ||
5c45ab24 | 319 | con = tipc_conn_lookup(srv, conid); |
c5fa7b3c | 320 | if (!con) |
414574a0 | 321 | return; |
c5fa7b3c | 322 | |
414574a0 JM |
323 | if (!connected(con)) |
324 | goto err; | |
4c887aa6 | 325 | |
414574a0 JM |
326 | e = kmalloc(sizeof(*e), GFP_ATOMIC); |
327 | if (!e) | |
328 | goto err; | |
329 | e->inactive = (event == TIPC_SUBSCR_TIMEOUT); | |
330 | memcpy(&e->evt, evt, sizeof(*evt)); | |
c5fa7b3c YX |
331 | spin_lock_bh(&con->outqueue_lock); |
332 | list_add_tail(&e->list, &con->outqueue); | |
333 | spin_unlock_bh(&con->outqueue_lock); | |
334 | ||
5c45ab24 | 335 | if (queue_work(srv->send_wq, &con->swork)) |
414574a0 JM |
336 | return; |
337 | err: | |
338 | conn_put(con); | |
c5fa7b3c YX |
339 | } |
340 | ||
026321c6 JM |
341 | /* tipc_conn_write_space - interrupt callback after a sendmsg EAGAIN |
342 | * Indicates that there now is more space in the send buffer | |
343 | * The queued work is launched into tipc_send_work()->tipc_conn_send_to_sock() | |
344 | */ | |
345 | static void tipc_conn_write_space(struct sock *sk) | |
14c04493 JM |
346 | { |
347 | struct tipc_conn *con; | |
348 | ||
026321c6 JM |
349 | read_lock_bh(&sk->sk_callback_lock); |
350 | con = sk->sk_user_data; | |
351 | if (connected(con)) { | |
352 | conn_get(con); | |
353 | if (!queue_work(con->server->send_wq, &con->swork)) | |
354 | conn_put(con); | |
355 | } | |
356 | read_unlock_bh(&sk->sk_callback_lock); | |
14c04493 JM |
357 | } |
358 | ||
026321c6 JM |
359 | static int tipc_conn_rcv_sub(struct tipc_topsrv *srv, |
360 | struct tipc_conn *con, | |
361 | struct tipc_subscr *s) | |
14c04493 | 362 | { |
026321c6 JM |
363 | struct tipc_net *tn = tipc_net(srv->net); |
364 | struct tipc_subscription *sub; | |
14c04493 | 365 | |
026321c6 | 366 | if (tipc_sub_read(s, filter) & TIPC_SUB_CANCEL) { |
33872d79 | 367 | s->filter &= __constant_ntohl(~TIPC_SUB_CANCEL); |
026321c6 JM |
368 | tipc_conn_delete_sub(con, s); |
369 | return 0; | |
370 | } | |
371 | if (atomic_read(&tn->subscription_count) >= TIPC_MAX_SUBSCR) { | |
372 | pr_warn("Subscription rejected, max (%u)\n", TIPC_MAX_SUBSCR); | |
373 | return -1; | |
374 | } | |
375 | sub = tipc_sub_subscribe(srv->net, s, con->conid); | |
376 | if (!sub) | |
377 | return -1; | |
378 | atomic_inc(&tn->subscription_count); | |
379 | spin_lock_bh(&con->sub_lock); | |
380 | list_add(&sub->sub_list, &con->sub_list); | |
381 | spin_unlock_bh(&con->sub_lock); | |
382 | return 0; | |
14c04493 JM |
383 | } |
384 | ||
026321c6 | 385 | static int tipc_conn_rcv_from_sock(struct tipc_conn *con) |
c5fa7b3c | 386 | { |
026321c6 JM |
387 | struct tipc_topsrv *srv = con->server; |
388 | struct sock *sk = con->sock->sk; | |
389 | struct msghdr msg = {}; | |
390 | struct tipc_subscr s; | |
414574a0 | 391 | struct kvec iov; |
c5fa7b3c YX |
392 | int ret; |
393 | ||
026321c6 JM |
394 | iov.iov_base = &s; |
395 | iov.iov_len = sizeof(s); | |
396 | msg.msg_name = NULL; | |
aa563d7b | 397 | iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, iov.iov_len); |
026321c6 JM |
398 | ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT); |
399 | if (ret == -EWOULDBLOCK) | |
400 | return -EWOULDBLOCK; | |
a88289f4 | 401 | if (ret == sizeof(s)) { |
026321c6 JM |
402 | read_lock_bh(&sk->sk_callback_lock); |
403 | ret = tipc_conn_rcv_sub(srv, con, &s); | |
404 | read_unlock_bh(&sk->sk_callback_lock); | |
980d6927 TL |
405 | if (!ret) |
406 | return 0; | |
c5fa7b3c | 407 | } |
026321c6 | 408 | |
980d6927 | 409 | tipc_conn_close(con); |
026321c6 | 410 | return ret; |
c5fa7b3c YX |
411 | } |
412 | ||
026321c6 | 413 | static void tipc_conn_recv_work(struct work_struct *work) |
c5fa7b3c YX |
414 | { |
415 | struct tipc_conn *con = container_of(work, struct tipc_conn, rwork); | |
416 | int count = 0; | |
417 | ||
df79d040 | 418 | while (connected(con)) { |
026321c6 | 419 | if (tipc_conn_rcv_from_sock(con)) |
c5fa7b3c YX |
420 | break; |
421 | ||
422 | /* Don't flood Rx machine */ | |
423 | if (++count >= MAX_RECV_MSG_COUNT) { | |
424 | cond_resched(); | |
425 | count = 0; | |
426 | } | |
427 | } | |
428 | conn_put(con); | |
429 | } | |
430 | ||
026321c6 JM |
431 | /* tipc_conn_data_ready - interrupt callback indicating the socket has data |
432 | * The queued work is launched into tipc_recv_work()->tipc_conn_rcv_from_sock() | |
433 | */ | |
434 | static void tipc_conn_data_ready(struct sock *sk) | |
c5fa7b3c | 435 | { |
026321c6 | 436 | struct tipc_conn *con; |
c5fa7b3c | 437 | |
026321c6 JM |
438 | read_lock_bh(&sk->sk_callback_lock); |
439 | con = sk->sk_user_data; | |
440 | if (connected(con)) { | |
441 | conn_get(con); | |
442 | if (!queue_work(con->server->rcv_wq, &con->rwork)) | |
443 | conn_put(con); | |
444 | } | |
445 | read_unlock_bh(&sk->sk_callback_lock); | |
c5fa7b3c YX |
446 | } |
447 | ||
026321c6 | 448 | static void tipc_topsrv_accept(struct work_struct *work) |
c5fa7b3c | 449 | { |
026321c6 | 450 | struct tipc_topsrv *srv = container_of(work, struct tipc_topsrv, awork); |
0ef897be JM |
451 | struct socket *lsock = srv->listener; |
452 | struct socket *newsock; | |
453 | struct tipc_conn *con; | |
454 | struct sock *newsk; | |
455 | int ret; | |
456 | ||
457 | while (1) { | |
458 | ret = kernel_accept(lsock, &newsock, O_NONBLOCK); | |
459 | if (ret < 0) | |
460 | return; | |
026321c6 | 461 | con = tipc_conn_alloc(srv); |
0ef897be JM |
462 | if (IS_ERR(con)) { |
463 | ret = PTR_ERR(con); | |
464 | sock_release(newsock); | |
465 | return; | |
466 | } | |
467 | /* Register callbacks */ | |
468 | newsk = newsock->sk; | |
469 | write_lock_bh(&newsk->sk_callback_lock); | |
026321c6 JM |
470 | newsk->sk_data_ready = tipc_conn_data_ready; |
471 | newsk->sk_write_space = tipc_conn_write_space; | |
0ef897be JM |
472 | newsk->sk_user_data = con; |
473 | con->sock = newsock; | |
474 | write_unlock_bh(&newsk->sk_callback_lock); | |
475 | ||
476 | /* Wake up receive process in case of 'SYN+' message */ | |
477 | newsk->sk_data_ready(newsk); | |
478 | } | |
479 | } | |
480 | ||
bad7f869 | 481 | /* tipc_topsrv_listener_data_ready - interrupt callback with connection request |
026321c6 | 482 | * The queued job is launched into tipc_topsrv_accept() |
0ef897be | 483 | */ |
026321c6 | 484 | static void tipc_topsrv_listener_data_ready(struct sock *sk) |
0ef897be | 485 | { |
026321c6 | 486 | struct tipc_topsrv *srv; |
0ef897be JM |
487 | |
488 | read_lock_bh(&sk->sk_callback_lock); | |
489 | srv = sk->sk_user_data; | |
490 | if (srv->listener) | |
491 | queue_work(srv->rcv_wq, &srv->awork); | |
492 | read_unlock_bh(&sk->sk_callback_lock); | |
493 | } | |
494 | ||
026321c6 | 495 | static int tipc_topsrv_create_listener(struct tipc_topsrv *srv) |
0ef897be JM |
496 | { |
497 | int imp = TIPC_CRITICAL_IMPORTANCE; | |
498 | struct socket *lsock = NULL; | |
499 | struct sockaddr_tipc saddr; | |
500 | struct sock *sk; | |
501 | int rc; | |
502 | ||
503 | rc = sock_create_kern(srv->net, AF_TIPC, SOCK_SEQPACKET, 0, &lsock); | |
504 | if (rc < 0) | |
505 | return rc; | |
506 | ||
507 | srv->listener = lsock; | |
508 | sk = lsock->sk; | |
509 | write_lock_bh(&sk->sk_callback_lock); | |
026321c6 | 510 | sk->sk_data_ready = tipc_topsrv_listener_data_ready; |
0ef897be JM |
511 | sk->sk_user_data = srv; |
512 | write_unlock_bh(&sk->sk_callback_lock); | |
513 | ||
514 | rc = kernel_setsockopt(lsock, SOL_TIPC, TIPC_IMPORTANCE, | |
515 | (char *)&imp, sizeof(imp)); | |
516 | if (rc < 0) | |
517 | goto err; | |
518 | ||
519 | saddr.family = AF_TIPC; | |
520 | saddr.addrtype = TIPC_ADDR_NAMESEQ; | |
521 | saddr.addr.nameseq.type = TIPC_TOP_SRV; | |
522 | saddr.addr.nameseq.lower = TIPC_TOP_SRV; | |
523 | saddr.addr.nameseq.upper = TIPC_TOP_SRV; | |
524 | saddr.scope = TIPC_NODE_SCOPE; | |
525 | ||
526 | rc = kernel_bind(lsock, (struct sockaddr *)&saddr, sizeof(saddr)); | |
527 | if (rc < 0) | |
528 | goto err; | |
529 | rc = kernel_listen(lsock, 0); | |
530 | if (rc < 0) | |
531 | goto err; | |
532 | ||
533 | /* As server's listening socket owner and creator is the same module, | |
534 | * we have to decrease TIPC module reference count to guarantee that | |
535 | * it remains zero after the server socket is created, otherwise, | |
536 | * executing "rmmod" command is unable to make TIPC module deleted | |
537 | * after TIPC module is inserted successfully. | |
538 | * | |
539 | * However, the reference count is ever increased twice in | |
540 | * sock_create_kern(): one is to increase the reference count of owner | |
541 | * of TIPC socket's proto_ops struct; another is to increment the | |
542 | * reference count of owner of TIPC proto struct. Therefore, we must | |
543 | * decrement the module reference count twice to ensure that it keeps | |
544 | * zero after server's listening socket is created. Of course, we | |
545 | * must bump the module reference count twice as well before the socket | |
546 | * is closed. | |
547 | */ | |
548 | module_put(lsock->ops->owner); | |
549 | module_put(sk->sk_prot_creator->owner); | |
550 | ||
551 | return 0; | |
552 | err: | |
553 | sock_release(lsock); | |
554 | return -EINVAL; | |
c5fa7b3c YX |
555 | } |
556 | ||
026321c6 JM |
557 | bool tipc_topsrv_kern_subscr(struct net *net, u32 port, u32 type, u32 lower, |
558 | u32 upper, u32 filter, int *conid) | |
559 | { | |
560 | struct tipc_subscr sub; | |
561 | struct tipc_conn *con; | |
562 | int rc; | |
563 | ||
564 | sub.seq.type = type; | |
565 | sub.seq.lower = lower; | |
566 | sub.seq.upper = upper; | |
567 | sub.timeout = TIPC_WAIT_FOREVER; | |
568 | sub.filter = filter; | |
569 | *(u32 *)&sub.usr_handle = port; | |
570 | ||
571 | con = tipc_conn_alloc(tipc_topsrv(net)); | |
572 | if (IS_ERR(con)) | |
573 | return false; | |
574 | ||
575 | *conid = con->conid; | |
576 | con->sock = NULL; | |
577 | rc = tipc_conn_rcv_sub(tipc_topsrv(net), con, &sub); | |
96c252bf JM |
578 | if (rc >= 0) |
579 | return true; | |
580 | conn_put(con); | |
581 | return false; | |
026321c6 JM |
582 | } |
583 | ||
584 | void tipc_topsrv_kern_unsubscr(struct net *net, int conid) | |
585 | { | |
586 | struct tipc_conn *con; | |
587 | ||
588 | con = tipc_conn_lookup(tipc_topsrv(net), conid); | |
589 | if (!con) | |
590 | return; | |
591 | ||
592 | test_and_clear_bit(CF_CONNECTED, &con->flags); | |
593 | tipc_conn_delete_sub(con, NULL); | |
594 | conn_put(con); | |
595 | conn_put(con); | |
596 | } | |
597 | ||
598 | static void tipc_topsrv_kern_evt(struct net *net, struct tipc_event *evt) | |
599 | { | |
600 | u32 port = *(u32 *)&evt->s.usr_handle; | |
601 | u32 self = tipc_own_addr(net); | |
602 | struct sk_buff_head evtq; | |
603 | struct sk_buff *skb; | |
604 | ||
605 | skb = tipc_msg_create(TOP_SRV, 0, INT_H_SIZE, sizeof(*evt), | |
606 | self, self, port, port, 0); | |
607 | if (!skb) | |
608 | return; | |
609 | msg_set_dest_droppable(buf_msg(skb), true); | |
610 | memcpy(msg_data(buf_msg(skb)), evt, sizeof(*evt)); | |
611 | skb_queue_head_init(&evtq); | |
612 | __skb_queue_tail(&evtq, skb); | |
6c9081a3 | 613 | tipc_loopback_trace(net, &evtq); |
026321c6 JM |
614 | tipc_sk_rcv(net, &evtq); |
615 | } | |
616 | ||
617 | static int tipc_topsrv_work_start(struct tipc_topsrv *s) | |
c5fa7b3c | 618 | { |
06c8581f | 619 | s->rcv_wq = alloc_ordered_workqueue("tipc_rcv", 0); |
c5fa7b3c YX |
620 | if (!s->rcv_wq) { |
621 | pr_err("can't start tipc receive workqueue\n"); | |
622 | return -ENOMEM; | |
623 | } | |
624 | ||
06c8581f | 625 | s->send_wq = alloc_ordered_workqueue("tipc_send", 0); |
c5fa7b3c YX |
626 | if (!s->send_wq) { |
627 | pr_err("can't start tipc send workqueue\n"); | |
628 | destroy_workqueue(s->rcv_wq); | |
629 | return -ENOMEM; | |
630 | } | |
631 | ||
632 | return 0; | |
633 | } | |
634 | ||
026321c6 | 635 | static void tipc_topsrv_work_stop(struct tipc_topsrv *s) |
0ef897be JM |
636 | { |
637 | destroy_workqueue(s->rcv_wq); | |
638 | destroy_workqueue(s->send_wq); | |
639 | } | |
640 | ||
526f5b85 | 641 | static int tipc_topsrv_start(struct net *net) |
c5fa7b3c | 642 | { |
5c45ab24 JM |
643 | struct tipc_net *tn = tipc_net(net); |
644 | const char name[] = "topology_server"; | |
026321c6 | 645 | struct tipc_topsrv *srv; |
c5fa7b3c YX |
646 | int ret; |
647 | ||
5c45ab24 | 648 | srv = kzalloc(sizeof(*srv), GFP_ATOMIC); |
0ef897be | 649 | if (!srv) |
5c45ab24 | 650 | return -ENOMEM; |
0ef897be JM |
651 | |
652 | srv->net = net; | |
026321c6 | 653 | INIT_WORK(&srv->awork, tipc_topsrv_accept); |
5c45ab24 | 654 | |
29e270fc | 655 | strscpy(srv->name, name, sizeof(srv->name)); |
5c45ab24 JM |
656 | tn->topsrv = srv; |
657 | atomic_set(&tn->subscription_count, 0); | |
658 | ||
659 | spin_lock_init(&srv->idr_lock); | |
660 | idr_init(&srv->conn_idr); | |
661 | srv->idr_in_use = 0; | |
c5fa7b3c | 662 | |
026321c6 | 663 | ret = tipc_topsrv_work_start(srv); |
414574a0 | 664 | if (ret < 0) |
c5fa7b3c | 665 | return ret; |
414574a0 | 666 | |
026321c6 | 667 | ret = tipc_topsrv_create_listener(srv); |
414574a0 | 668 | if (ret < 0) |
026321c6 | 669 | tipc_topsrv_work_stop(srv); |
414574a0 | 670 | |
c756891a | 671 | return ret; |
c5fa7b3c YX |
672 | } |
673 | ||
526f5b85 | 674 | static void tipc_topsrv_stop(struct net *net) |
c5fa7b3c | 675 | { |
026321c6 | 676 | struct tipc_topsrv *srv = tipc_topsrv(net); |
0ef897be | 677 | struct socket *lsock = srv->listener; |
c5fa7b3c | 678 | struct tipc_conn *con; |
c5fa7b3c YX |
679 | int id; |
680 | ||
5c45ab24 JM |
681 | spin_lock_bh(&srv->idr_lock); |
682 | for (id = 0; srv->idr_in_use; id++) { | |
683 | con = idr_find(&srv->conn_idr, id); | |
c5fa7b3c | 684 | if (con) { |
5c45ab24 | 685 | spin_unlock_bh(&srv->idr_lock); |
026321c6 | 686 | tipc_conn_close(con); |
5c45ab24 | 687 | spin_lock_bh(&srv->idr_lock); |
c5fa7b3c YX |
688 | } |
689 | } | |
0ef897be JM |
690 | __module_get(lsock->ops->owner); |
691 | __module_get(lsock->sk->sk_prot_creator->owner); | |
0ef897be | 692 | srv->listener = NULL; |
5c45ab24 | 693 | spin_unlock_bh(&srv->idr_lock); |
26736a08 | 694 | sock_release(lsock); |
026321c6 | 695 | tipc_topsrv_work_stop(srv); |
5c45ab24 | 696 | idr_destroy(&srv->conn_idr); |
5c45ab24 | 697 | kfree(srv); |
c5fa7b3c | 698 | } |
526f5b85 JH |
699 | |
700 | int __net_init tipc_topsrv_init_net(struct net *net) | |
701 | { | |
702 | return tipc_topsrv_start(net); | |
703 | } | |
704 | ||
705 | void __net_exit tipc_topsrv_exit_net(struct net *net) | |
706 | { | |
707 | tipc_topsrv_stop(net); | |
708 | } |