1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* RxRPC individual remote procedure call handling 3 * 4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/slab.h> 11 #include <linux/module.h> 12 #include <linux/circ_buf.h> 13 #include <linux/spinlock_types.h> 14 #include <net/sock.h> 15 #include <net/af_rxrpc.h> 16 #include "ar-internal.h" 17 18 const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { 19 [RXRPC_CALL_UNINITIALISED] = "Uninit ", 20 [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", 21 [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", 22 [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", 23 [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", 24 [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", 25 [RXRPC_CALL_SERVER_SECURING] = "SvSecure", 26 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", 27 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", 28 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", 29 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", 30 [RXRPC_CALL_COMPLETE] = "Complete", 31 }; 32 33 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { 34 [RXRPC_CALL_SUCCEEDED] = "Complete", 35 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", 36 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", 37 [RXRPC_CALL_LOCAL_ERROR] = "LocError", 38 [RXRPC_CALL_NETWORK_ERROR] = "NetError", 39 }; 40 41 struct kmem_cache *rxrpc_call_jar; 42 43 static struct semaphore rxrpc_call_limiter = 44 __SEMAPHORE_INITIALIZER(rxrpc_call_limiter, 1000); 45 static struct semaphore rxrpc_kernel_call_limiter = 46 __SEMAPHORE_INITIALIZER(rxrpc_kernel_call_limiter, 1000); 47 48 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what) 49 { 50 struct rxrpc_local *local = call->local; 51 bool busy; 52 53 if (call->state < RXRPC_CALL_COMPLETE) { 54 spin_lock_bh(&local->lock); 55 busy = !list_empty(&call->attend_link); 56 trace_rxrpc_poke_call(call, busy, what); 57 if (!busy) { 58 rxrpc_get_call(call, rxrpc_call_get_poke); 59 list_add_tail(&call->attend_link, &local->call_attend_q); 60 } 61 spin_unlock_bh(&local->lock); 62 rxrpc_wake_up_io_thread(local); 63 } 64 } 65 66 static void rxrpc_call_timer_expired(struct timer_list *t) 67 { 68 struct rxrpc_call *call = from_timer(call, t, timer); 69 70 _enter("%d", call->debug_id); 71 72 if (call->state < RXRPC_CALL_COMPLETE) { 73 trace_rxrpc_timer_expired(call, jiffies); 74 rxrpc_poke_call(call, rxrpc_call_poke_timer); 75 } 76 } 77 78 void rxrpc_reduce_call_timer(struct rxrpc_call *call, 79 unsigned long expire_at, 80 unsigned long now, 81 enum rxrpc_timer_trace why) 82 { 83 trace_rxrpc_timer(call, why, now); 84 timer_reduce(&call->timer, expire_at); 85 } 86 87 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 88 89 static void rxrpc_destroy_call(struct work_struct *); 90 91 /* 92 * find an extant server call 93 * - called in process context with IRQs enabled 94 */ 95 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 96 unsigned long user_call_ID) 97 { 98 struct rxrpc_call *call; 99 struct rb_node *p; 100 101 _enter("%p,%lx", rx, user_call_ID); 102 103 read_lock(&rx->call_lock); 104 105 p = rx->calls.rb_node; 106 while (p) { 107 call = rb_entry(p, struct rxrpc_call, sock_node); 108 109 if (user_call_ID < call->user_call_ID) 110 p = p->rb_left; 111 else if (user_call_ID > call->user_call_ID) 112 p = p->rb_right; 113 else 114 goto found_extant_call; 115 } 116 117 read_unlock(&rx->call_lock); 118 _leave(" = NULL"); 119 return NULL; 120 121 found_extant_call: 122 rxrpc_get_call(call, rxrpc_call_get_sendmsg); 123 read_unlock(&rx->call_lock); 124 _leave(" = %p [%d]", call, refcount_read(&call->ref)); 125 return call; 126 } 127 128 /* 129 * allocate a new call 130 */ 131 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, 132 unsigned int debug_id) 133 { 134 struct rxrpc_call *call; 135 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 136 137 call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 138 if (!call) 139 return NULL; 140 141 mutex_init(&call->user_mutex); 142 143 /* Prevent lockdep reporting a deadlock false positive between the afs 144 * filesystem and sys_sendmsg() via the mmap sem. 145 */ 146 if (rx->sk.sk_kern_sock) 147 lockdep_set_class(&call->user_mutex, 148 &rxrpc_call_user_mutex_lock_class_key); 149 150 timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 151 INIT_WORK(&call->destroyer, rxrpc_destroy_call); 152 INIT_LIST_HEAD(&call->link); 153 INIT_LIST_HEAD(&call->chan_wait_link); 154 INIT_LIST_HEAD(&call->accept_link); 155 INIT_LIST_HEAD(&call->recvmsg_link); 156 INIT_LIST_HEAD(&call->sock_link); 157 INIT_LIST_HEAD(&call->attend_link); 158 INIT_LIST_HEAD(&call->tx_sendmsg); 159 INIT_LIST_HEAD(&call->tx_buffer); 160 skb_queue_head_init(&call->recvmsg_queue); 161 skb_queue_head_init(&call->rx_oos_queue); 162 init_waitqueue_head(&call->waitq); 163 spin_lock_init(&call->notify_lock); 164 spin_lock_init(&call->tx_lock); 165 rwlock_init(&call->state_lock); 166 refcount_set(&call->ref, 1); 167 call->debug_id = debug_id; 168 call->tx_total_len = -1; 169 call->next_rx_timo = 20 * HZ; 170 call->next_req_timo = 1 * HZ; 171 atomic64_set(&call->ackr_window, 0x100000001ULL); 172 173 memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 174 175 call->rx_winsize = rxrpc_rx_window_size; 176 call->tx_winsize = 16; 177 178 if (RXRPC_TX_SMSS > 2190) 179 call->cong_cwnd = 2; 180 else if (RXRPC_TX_SMSS > 1095) 181 call->cong_cwnd = 3; 182 else 183 call->cong_cwnd = 4; 184 call->cong_ssthresh = RXRPC_TX_MAX_WINDOW; 185 186 call->rxnet = rxnet; 187 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; 188 atomic_inc(&rxnet->nr_calls); 189 return call; 190 } 191 192 /* 193 * Allocate a new client call. 194 */ 195 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 196 struct sockaddr_rxrpc *srx, 197 struct rxrpc_conn_parameters *cp, 198 struct rxrpc_call_params *p, 199 gfp_t gfp, 200 unsigned int debug_id) 201 { 202 struct rxrpc_call *call; 203 ktime_t now; 204 int ret; 205 206 _enter(""); 207 208 call = rxrpc_alloc_call(rx, gfp, debug_id); 209 if (!call) 210 return ERR_PTR(-ENOMEM); 211 now = ktime_get_real(); 212 call->acks_latest_ts = now; 213 call->cong_tstamp = now; 214 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 215 call->dest_srx = *srx; 216 call->interruptibility = p->interruptibility; 217 call->tx_total_len = p->tx_total_len; 218 call->key = key_get(cp->key); 219 call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call); 220 if (p->kernel) 221 __set_bit(RXRPC_CALL_KERNEL, &call->flags); 222 if (cp->upgrade) 223 __set_bit(RXRPC_CALL_UPGRADE, &call->flags); 224 if (cp->exclusive) 225 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags); 226 227 ret = rxrpc_init_client_call_security(call); 228 if (ret < 0) { 229 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret); 230 rxrpc_put_call(call, rxrpc_call_put_discard_error); 231 return ERR_PTR(ret); 232 } 233 234 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 235 p->user_call_ID, rxrpc_call_new_client); 236 237 _leave(" = %p", call); 238 return call; 239 } 240 241 /* 242 * Initiate the call ack/resend/expiry timer. 243 */ 244 static void rxrpc_start_call_timer(struct rxrpc_call *call) 245 { 246 unsigned long now = jiffies; 247 unsigned long j = now + MAX_JIFFY_OFFSET; 248 249 call->delay_ack_at = j; 250 call->ack_lost_at = j; 251 call->resend_at = j; 252 call->ping_at = j; 253 call->keepalive_at = j; 254 call->expect_rx_by = j; 255 call->expect_req_by = j; 256 call->expect_term_by = j; 257 call->timer.expires = now; 258 } 259 260 /* 261 * Wait for a call slot to become available. 262 */ 263 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) 264 { 265 struct semaphore *limiter = &rxrpc_call_limiter; 266 267 if (p->kernel) 268 limiter = &rxrpc_kernel_call_limiter; 269 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { 270 down(limiter); 271 return limiter; 272 } 273 return down_interruptible(limiter) < 0 ? NULL : limiter; 274 } 275 276 /* 277 * Release a call slot. 278 */ 279 static void rxrpc_put_call_slot(struct rxrpc_call *call) 280 { 281 struct semaphore *limiter = &rxrpc_call_limiter; 282 283 if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) 284 limiter = &rxrpc_kernel_call_limiter; 285 up(limiter); 286 } 287 288 /* 289 * Set up a call for the given parameters. 290 * - Called with the socket lock held, which it must release. 291 * - If it returns a call, the call's lock will need releasing by the caller. 292 */ 293 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 294 struct rxrpc_conn_parameters *cp, 295 struct sockaddr_rxrpc *srx, 296 struct rxrpc_call_params *p, 297 gfp_t gfp, 298 unsigned int debug_id) 299 __releases(&rx->sk.sk_lock.slock) 300 __acquires(&call->user_mutex) 301 { 302 struct rxrpc_call *call, *xcall; 303 struct rxrpc_net *rxnet; 304 struct semaphore *limiter; 305 struct rb_node *parent, **pp; 306 int ret; 307 308 _enter("%p,%lx", rx, p->user_call_ID); 309 310 limiter = rxrpc_get_call_slot(p, gfp); 311 if (!limiter) { 312 release_sock(&rx->sk); 313 return ERR_PTR(-ERESTARTSYS); 314 } 315 316 call = rxrpc_alloc_client_call(rx, srx, cp, p, gfp, debug_id); 317 if (IS_ERR(call)) { 318 release_sock(&rx->sk); 319 up(limiter); 320 _leave(" = %ld", PTR_ERR(call)); 321 return call; 322 } 323 324 /* We need to protect a partially set up call against the user as we 325 * will be acting outside the socket lock. 326 */ 327 mutex_lock(&call->user_mutex); 328 329 /* Publish the call, even though it is incompletely set up as yet */ 330 write_lock(&rx->call_lock); 331 332 pp = &rx->calls.rb_node; 333 parent = NULL; 334 while (*pp) { 335 parent = *pp; 336 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 337 338 if (p->user_call_ID < xcall->user_call_ID) 339 pp = &(*pp)->rb_left; 340 else if (p->user_call_ID > xcall->user_call_ID) 341 pp = &(*pp)->rb_right; 342 else 343 goto error_dup_user_ID; 344 } 345 346 rcu_assign_pointer(call->socket, rx); 347 call->user_call_ID = p->user_call_ID; 348 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 349 rxrpc_get_call(call, rxrpc_call_get_userid); 350 rb_link_node(&call->sock_node, parent, pp); 351 rb_insert_color(&call->sock_node, &rx->calls); 352 list_add(&call->sock_link, &rx->sock_calls); 353 354 write_unlock(&rx->call_lock); 355 356 rxnet = call->rxnet; 357 spin_lock(&rxnet->call_lock); 358 list_add_tail_rcu(&call->link, &rxnet->calls); 359 spin_unlock(&rxnet->call_lock); 360 361 /* From this point on, the call is protected by its own lock. */ 362 release_sock(&rx->sk); 363 364 /* Set up or get a connection record and set the protocol parameters, 365 * including channel number and call ID. 366 */ 367 ret = rxrpc_connect_call(rx, call, cp, srx, gfp); 368 if (ret < 0) 369 goto error_attached_to_socket; 370 371 rxrpc_see_call(call, rxrpc_call_see_connected); 372 373 rxrpc_start_call_timer(call); 374 375 _leave(" = %p [new]", call); 376 return call; 377 378 /* We unexpectedly found the user ID in the list after taking 379 * the call_lock. This shouldn't happen unless the user races 380 * with itself and tries to add the same user ID twice at the 381 * same time in different threads. 382 */ 383 error_dup_user_ID: 384 write_unlock(&rx->call_lock); 385 release_sock(&rx->sk); 386 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 387 RX_CALL_DEAD, -EEXIST); 388 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0, 389 rxrpc_call_see_userid_exists); 390 rxrpc_release_call(rx, call); 391 mutex_unlock(&call->user_mutex); 392 rxrpc_put_call(call, rxrpc_call_put_userid_exists); 393 _leave(" = -EEXIST"); 394 return ERR_PTR(-EEXIST); 395 396 /* We got an error, but the call is attached to the socket and is in 397 * need of release. However, we might now race with recvmsg() when 398 * completing the call queues it. Return 0 from sys_sendmsg() and 399 * leave the error to recvmsg() to deal with. 400 */ 401 error_attached_to_socket: 402 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret, 403 rxrpc_call_see_connect_failed); 404 set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); 405 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 406 RX_CALL_DEAD, ret); 407 _leave(" = c=%08x [err]", call->debug_id); 408 return call; 409 } 410 411 /* 412 * Set up an incoming call. call->conn points to the connection. 413 * This is called in BH context and isn't allowed to fail. 414 */ 415 void rxrpc_incoming_call(struct rxrpc_sock *rx, 416 struct rxrpc_call *call, 417 struct sk_buff *skb) 418 { 419 struct rxrpc_connection *conn = call->conn; 420 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 421 u32 chan; 422 423 _enter(",%d", call->conn->debug_id); 424 425 rcu_assign_pointer(call->socket, rx); 426 call->call_id = sp->hdr.callNumber; 427 call->dest_srx.srx_service = sp->hdr.serviceId; 428 call->cid = sp->hdr.cid; 429 call->state = RXRPC_CALL_SERVER_SECURING; 430 call->cong_tstamp = skb->tstamp; 431 432 spin_lock(&conn->state_lock); 433 434 switch (conn->state) { 435 case RXRPC_CONN_SERVICE_UNSECURED: 436 case RXRPC_CONN_SERVICE_CHALLENGING: 437 call->state = RXRPC_CALL_SERVER_SECURING; 438 break; 439 case RXRPC_CONN_SERVICE: 440 call->state = RXRPC_CALL_SERVER_RECV_REQUEST; 441 break; 442 443 case RXRPC_CONN_REMOTELY_ABORTED: 444 __rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, 445 conn->abort_code, conn->error); 446 break; 447 case RXRPC_CONN_LOCALLY_ABORTED: 448 __rxrpc_abort_call("CON", call, 1, 449 conn->abort_code, conn->error); 450 break; 451 default: 452 BUG(); 453 } 454 455 /* Set the channel for this call. We don't get channel_lock as we're 456 * only defending against the data_ready handler (which we're called 457 * from) and the RESPONSE packet parser (which is only really 458 * interested in call_counter and can cope with a disagreement with the 459 * call pointer). 460 */ 461 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 462 conn->channels[chan].call_counter = call->call_id; 463 conn->channels[chan].call_id = call->call_id; 464 rcu_assign_pointer(conn->channels[chan].call, call); 465 spin_unlock(&conn->state_lock); 466 467 spin_lock(&conn->peer->lock); 468 hlist_add_head(&call->error_link, &conn->peer->error_targets); 469 spin_unlock(&conn->peer->lock); 470 471 rxrpc_start_call_timer(call); 472 _leave(""); 473 } 474 475 /* 476 * Note the re-emergence of a call. 477 */ 478 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 479 { 480 if (call) { 481 int r = refcount_read(&call->ref); 482 483 trace_rxrpc_call(call->debug_id, r, 0, why); 484 } 485 } 486 487 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call, 488 enum rxrpc_call_trace why) 489 { 490 int r; 491 492 if (!call || !__refcount_inc_not_zero(&call->ref, &r)) 493 return NULL; 494 trace_rxrpc_call(call->debug_id, r + 1, 0, why); 495 return call; 496 } 497 498 /* 499 * Note the addition of a ref on a call. 500 */ 501 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 502 { 503 int r; 504 505 __refcount_inc(&call->ref, &r); 506 trace_rxrpc_call(call->debug_id, r + 1, 0, why); 507 } 508 509 /* 510 * Clean up the Rx skb ring. 511 */ 512 static void rxrpc_cleanup_ring(struct rxrpc_call *call) 513 { 514 skb_queue_purge(&call->recvmsg_queue); 515 skb_queue_purge(&call->rx_oos_queue); 516 } 517 518 /* 519 * Detach a call from its owning socket. 520 */ 521 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 522 { 523 struct rxrpc_connection *conn = call->conn; 524 bool put = false; 525 526 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); 527 528 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 529 call->flags, rxrpc_call_see_release); 530 531 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 532 533 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 534 BUG(); 535 536 rxrpc_put_call_slot(call); 537 del_timer_sync(&call->timer); 538 539 /* Make sure we don't get any more notifications */ 540 write_lock(&rx->recvmsg_lock); 541 542 if (!list_empty(&call->recvmsg_link)) { 543 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 544 call, call->events, call->flags); 545 list_del(&call->recvmsg_link); 546 put = true; 547 } 548 549 /* list_empty() must return false in rxrpc_notify_socket() */ 550 call->recvmsg_link.next = NULL; 551 call->recvmsg_link.prev = NULL; 552 553 write_unlock(&rx->recvmsg_lock); 554 if (put) 555 rxrpc_put_call(call, rxrpc_call_put_unnotify); 556 557 write_lock(&rx->call_lock); 558 559 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 560 rb_erase(&call->sock_node, &rx->calls); 561 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 562 rxrpc_put_call(call, rxrpc_call_put_userid_exists); 563 } 564 565 list_del(&call->sock_link); 566 write_unlock(&rx->call_lock); 567 568 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 569 570 if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) 571 rxrpc_disconnect_call(call); 572 if (call->security) 573 call->security->free_call_crypto(call); 574 _leave(""); 575 } 576 577 /* 578 * release all the calls associated with a socket 579 */ 580 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 581 { 582 struct rxrpc_call *call; 583 584 _enter("%p", rx); 585 586 while (!list_empty(&rx->to_be_accepted)) { 587 call = list_entry(rx->to_be_accepted.next, 588 struct rxrpc_call, accept_link); 589 list_del(&call->accept_link); 590 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 591 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba); 592 } 593 594 while (!list_empty(&rx->sock_calls)) { 595 call = list_entry(rx->sock_calls.next, 596 struct rxrpc_call, sock_link); 597 rxrpc_get_call(call, rxrpc_call_get_release_sock); 598 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 599 rxrpc_send_abort_packet(call); 600 rxrpc_release_call(rx, call); 601 rxrpc_put_call(call, rxrpc_call_put_release_sock); 602 } 603 604 _leave(""); 605 } 606 607 /* 608 * release a call 609 */ 610 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 611 { 612 struct rxrpc_net *rxnet = call->rxnet; 613 unsigned int debug_id = call->debug_id; 614 bool dead; 615 int r; 616 617 ASSERT(call != NULL); 618 619 dead = __refcount_dec_and_test(&call->ref, &r); 620 trace_rxrpc_call(debug_id, r - 1, 0, why); 621 if (dead) { 622 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 623 624 if (!list_empty(&call->link)) { 625 spin_lock(&rxnet->call_lock); 626 list_del_init(&call->link); 627 spin_unlock(&rxnet->call_lock); 628 } 629 630 rxrpc_cleanup_call(call); 631 } 632 } 633 634 /* 635 * Free up the call under RCU. 636 */ 637 static void rxrpc_rcu_free_call(struct rcu_head *rcu) 638 { 639 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 640 struct rxrpc_net *rxnet = READ_ONCE(call->rxnet); 641 642 kmem_cache_free(rxrpc_call_jar, call); 643 if (atomic_dec_and_test(&rxnet->nr_calls)) 644 wake_up_var(&rxnet->nr_calls); 645 } 646 647 /* 648 * Final call destruction - but must be done in process context. 649 */ 650 static void rxrpc_destroy_call(struct work_struct *work) 651 { 652 struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer); 653 struct rxrpc_txbuf *txb; 654 655 del_timer_sync(&call->timer); 656 657 rxrpc_cleanup_ring(call); 658 while ((txb = list_first_entry_or_null(&call->tx_sendmsg, 659 struct rxrpc_txbuf, call_link))) { 660 list_del(&txb->call_link); 661 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); 662 } 663 while ((txb = list_first_entry_or_null(&call->tx_buffer, 664 struct rxrpc_txbuf, call_link))) { 665 list_del(&txb->call_link); 666 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); 667 } 668 669 rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned); 670 rxrpc_put_connection(call->conn, rxrpc_conn_put_call); 671 rxrpc_put_peer(call->peer, rxrpc_peer_put_call); 672 rxrpc_put_local(call->local, rxrpc_local_put_call); 673 call_rcu(&call->rcu, rxrpc_rcu_free_call); 674 } 675 676 /* 677 * clean up a call 678 */ 679 void rxrpc_cleanup_call(struct rxrpc_call *call) 680 { 681 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 682 683 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 684 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 685 686 del_timer(&call->timer); 687 688 if (rcu_read_lock_held()) 689 /* Can't use the rxrpc workqueue as we need to cancel/flush 690 * something that may be running/waiting there. 691 */ 692 schedule_work(&call->destroyer); 693 else 694 rxrpc_destroy_call(&call->destroyer); 695 } 696 697 /* 698 * Make sure that all calls are gone from a network namespace. To reach this 699 * point, any open UDP sockets in that namespace must have been closed, so any 700 * outstanding calls cannot be doing I/O. 701 */ 702 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 703 { 704 struct rxrpc_call *call; 705 706 _enter(""); 707 708 if (!list_empty(&rxnet->calls)) { 709 spin_lock(&rxnet->call_lock); 710 711 while (!list_empty(&rxnet->calls)) { 712 call = list_entry(rxnet->calls.next, 713 struct rxrpc_call, link); 714 _debug("Zapping call %p", call); 715 716 rxrpc_see_call(call, rxrpc_call_see_zap); 717 list_del_init(&call->link); 718 719 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 720 call, refcount_read(&call->ref), 721 rxrpc_call_states[call->state], 722 call->flags, call->events); 723 724 spin_unlock(&rxnet->call_lock); 725 cond_resched(); 726 spin_lock(&rxnet->call_lock); 727 } 728 729 spin_unlock(&rxnet->call_lock); 730 } 731 732 atomic_dec(&rxnet->nr_calls); 733 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 734 } 735