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