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 static void rxrpc_call_timer_expired(struct timer_list *t) 49 { 50 struct rxrpc_call *call = from_timer(call, t, timer); 51 52 _enter("%d", call->debug_id); 53 54 if (call->state < RXRPC_CALL_COMPLETE) { 55 trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies); 56 __rxrpc_queue_call(call); 57 } else { 58 rxrpc_put_call(call, rxrpc_call_put); 59 } 60 } 61 62 void rxrpc_reduce_call_timer(struct rxrpc_call *call, 63 unsigned long expire_at, 64 unsigned long now, 65 enum rxrpc_timer_trace why) 66 { 67 if (rxrpc_try_get_call(call, rxrpc_call_got_timer)) { 68 trace_rxrpc_timer(call, why, now); 69 if (timer_reduce(&call->timer, expire_at)) 70 rxrpc_put_call(call, rxrpc_call_put_notimer); 71 } 72 } 73 74 void rxrpc_delete_call_timer(struct rxrpc_call *call) 75 { 76 if (del_timer_sync(&call->timer)) 77 rxrpc_put_call(call, rxrpc_call_put_timer); 78 } 79 80 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 81 82 /* 83 * find an extant server call 84 * - called in process context with IRQs enabled 85 */ 86 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 87 unsigned long user_call_ID) 88 { 89 struct rxrpc_call *call; 90 struct rb_node *p; 91 92 _enter("%p,%lx", rx, user_call_ID); 93 94 read_lock(&rx->call_lock); 95 96 p = rx->calls.rb_node; 97 while (p) { 98 call = rb_entry(p, struct rxrpc_call, sock_node); 99 100 if (user_call_ID < call->user_call_ID) 101 p = p->rb_left; 102 else if (user_call_ID > call->user_call_ID) 103 p = p->rb_right; 104 else 105 goto found_extant_call; 106 } 107 108 read_unlock(&rx->call_lock); 109 _leave(" = NULL"); 110 return NULL; 111 112 found_extant_call: 113 rxrpc_get_call(call, rxrpc_call_got); 114 read_unlock(&rx->call_lock); 115 _leave(" = %p [%d]", call, refcount_read(&call->ref)); 116 return call; 117 } 118 119 /* 120 * allocate a new call 121 */ 122 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, 123 unsigned int debug_id) 124 { 125 struct rxrpc_call *call; 126 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 127 128 call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 129 if (!call) 130 return NULL; 131 132 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 133 sizeof(struct sk_buff *), 134 gfp); 135 if (!call->rxtx_buffer) 136 goto nomem; 137 138 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 139 if (!call->rxtx_annotations) 140 goto nomem_2; 141 142 mutex_init(&call->user_mutex); 143 144 /* Prevent lockdep reporting a deadlock false positive between the afs 145 * filesystem and sys_sendmsg() via the mmap sem. 146 */ 147 if (rx->sk.sk_kern_sock) 148 lockdep_set_class(&call->user_mutex, 149 &rxrpc_call_user_mutex_lock_class_key); 150 151 timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 152 INIT_WORK(&call->processor, &rxrpc_process_call); 153 INIT_LIST_HEAD(&call->link); 154 INIT_LIST_HEAD(&call->chan_wait_link); 155 INIT_LIST_HEAD(&call->accept_link); 156 INIT_LIST_HEAD(&call->recvmsg_link); 157 INIT_LIST_HEAD(&call->sock_link); 158 init_waitqueue_head(&call->waitq); 159 spin_lock_init(&call->lock); 160 spin_lock_init(&call->notify_lock); 161 spin_lock_init(&call->input_lock); 162 rwlock_init(&call->state_lock); 163 refcount_set(&call->ref, 1); 164 call->debug_id = debug_id; 165 call->tx_total_len = -1; 166 call->next_rx_timo = 20 * HZ; 167 call->next_req_timo = 1 * HZ; 168 169 memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 170 171 /* Leave space in the ring to handle a maxed-out jumbo packet */ 172 call->rx_winsize = rxrpc_rx_window_size; 173 call->tx_winsize = 16; 174 call->rx_expect_next = 1; 175 176 call->cong_cwnd = 2; 177 call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 178 179 call->rxnet = rxnet; 180 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; 181 atomic_inc(&rxnet->nr_calls); 182 return call; 183 184 nomem_2: 185 kfree(call->rxtx_buffer); 186 nomem: 187 kmem_cache_free(rxrpc_call_jar, call); 188 return NULL; 189 } 190 191 /* 192 * Allocate a new client call. 193 */ 194 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 195 struct sockaddr_rxrpc *srx, 196 gfp_t gfp, 197 unsigned int debug_id) 198 { 199 struct rxrpc_call *call; 200 ktime_t now; 201 202 _enter(""); 203 204 call = rxrpc_alloc_call(rx, gfp, debug_id); 205 if (!call) 206 return ERR_PTR(-ENOMEM); 207 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 208 call->service_id = srx->srx_service; 209 call->tx_phase = true; 210 now = ktime_get_real(); 211 call->acks_latest_ts = now; 212 call->cong_tstamp = now; 213 214 _leave(" = %p", call); 215 return call; 216 } 217 218 /* 219 * Initiate the call ack/resend/expiry timer. 220 */ 221 static void rxrpc_start_call_timer(struct rxrpc_call *call) 222 { 223 unsigned long now = jiffies; 224 unsigned long j = now + MAX_JIFFY_OFFSET; 225 226 call->ack_at = j; 227 call->ack_lost_at = j; 228 call->resend_at = j; 229 call->ping_at = j; 230 call->expect_rx_by = j; 231 call->expect_req_by = j; 232 call->expect_term_by = j; 233 call->timer.expires = now; 234 } 235 236 /* 237 * Wait for a call slot to become available. 238 */ 239 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) 240 { 241 struct semaphore *limiter = &rxrpc_call_limiter; 242 243 if (p->kernel) 244 limiter = &rxrpc_kernel_call_limiter; 245 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { 246 down(limiter); 247 return limiter; 248 } 249 return down_interruptible(limiter) < 0 ? NULL : limiter; 250 } 251 252 /* 253 * Release a call slot. 254 */ 255 static void rxrpc_put_call_slot(struct rxrpc_call *call) 256 { 257 struct semaphore *limiter = &rxrpc_call_limiter; 258 259 if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) 260 limiter = &rxrpc_kernel_call_limiter; 261 up(limiter); 262 } 263 264 /* 265 * Set up a call for the given parameters. 266 * - Called with the socket lock held, which it must release. 267 * - If it returns a call, the call's lock will need releasing by the caller. 268 */ 269 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 270 struct rxrpc_conn_parameters *cp, 271 struct sockaddr_rxrpc *srx, 272 struct rxrpc_call_params *p, 273 gfp_t gfp, 274 unsigned int debug_id) 275 __releases(&rx->sk.sk_lock.slock) 276 __acquires(&call->user_mutex) 277 { 278 struct rxrpc_call *call, *xcall; 279 struct rxrpc_net *rxnet; 280 struct semaphore *limiter; 281 struct rb_node *parent, **pp; 282 const void *here = __builtin_return_address(0); 283 int ret; 284 285 _enter("%p,%lx", rx, p->user_call_ID); 286 287 limiter = rxrpc_get_call_slot(p, gfp); 288 if (!limiter) 289 return ERR_PTR(-ERESTARTSYS); 290 291 call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); 292 if (IS_ERR(call)) { 293 release_sock(&rx->sk); 294 up(limiter); 295 _leave(" = %ld", PTR_ERR(call)); 296 return call; 297 } 298 299 call->interruptibility = p->interruptibility; 300 call->tx_total_len = p->tx_total_len; 301 trace_rxrpc_call(call->debug_id, rxrpc_call_new_client, 302 refcount_read(&call->ref), 303 here, (const void *)p->user_call_ID); 304 if (p->kernel) 305 __set_bit(RXRPC_CALL_KERNEL, &call->flags); 306 307 /* We need to protect a partially set up call against the user as we 308 * will be acting outside the socket lock. 309 */ 310 mutex_lock(&call->user_mutex); 311 312 /* Publish the call, even though it is incompletely set up as yet */ 313 write_lock(&rx->call_lock); 314 315 pp = &rx->calls.rb_node; 316 parent = NULL; 317 while (*pp) { 318 parent = *pp; 319 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 320 321 if (p->user_call_ID < xcall->user_call_ID) 322 pp = &(*pp)->rb_left; 323 else if (p->user_call_ID > xcall->user_call_ID) 324 pp = &(*pp)->rb_right; 325 else 326 goto error_dup_user_ID; 327 } 328 329 rcu_assign_pointer(call->socket, rx); 330 call->user_call_ID = p->user_call_ID; 331 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 332 rxrpc_get_call(call, rxrpc_call_got_userid); 333 rb_link_node(&call->sock_node, parent, pp); 334 rb_insert_color(&call->sock_node, &rx->calls); 335 list_add(&call->sock_link, &rx->sock_calls); 336 337 write_unlock(&rx->call_lock); 338 339 rxnet = call->rxnet; 340 spin_lock_bh(&rxnet->call_lock); 341 list_add_tail_rcu(&call->link, &rxnet->calls); 342 spin_unlock_bh(&rxnet->call_lock); 343 344 /* From this point on, the call is protected by its own lock. */ 345 release_sock(&rx->sk); 346 347 /* Set up or get a connection record and set the protocol parameters, 348 * including channel number and call ID. 349 */ 350 ret = rxrpc_connect_call(rx, call, cp, srx, gfp); 351 if (ret < 0) 352 goto error_attached_to_socket; 353 354 trace_rxrpc_call(call->debug_id, rxrpc_call_connected, 355 refcount_read(&call->ref), here, NULL); 356 357 rxrpc_start_call_timer(call); 358 359 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 360 361 _leave(" = %p [new]", call); 362 return call; 363 364 /* We unexpectedly found the user ID in the list after taking 365 * the call_lock. This shouldn't happen unless the user races 366 * with itself and tries to add the same user ID twice at the 367 * same time in different threads. 368 */ 369 error_dup_user_ID: 370 write_unlock(&rx->call_lock); 371 release_sock(&rx->sk); 372 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 373 RX_CALL_DEAD, -EEXIST); 374 trace_rxrpc_call(call->debug_id, rxrpc_call_error, 375 refcount_read(&call->ref), here, ERR_PTR(-EEXIST)); 376 rxrpc_release_call(rx, call); 377 mutex_unlock(&call->user_mutex); 378 rxrpc_put_call(call, rxrpc_call_put); 379 _leave(" = -EEXIST"); 380 return ERR_PTR(-EEXIST); 381 382 /* We got an error, but the call is attached to the socket and is in 383 * need of release. However, we might now race with recvmsg() when 384 * completing the call queues it. Return 0 from sys_sendmsg() and 385 * leave the error to recvmsg() to deal with. 386 */ 387 error_attached_to_socket: 388 trace_rxrpc_call(call->debug_id, rxrpc_call_error, 389 refcount_read(&call->ref), here, ERR_PTR(ret)); 390 set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); 391 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 392 RX_CALL_DEAD, ret); 393 _leave(" = c=%08x [err]", call->debug_id); 394 return call; 395 } 396 397 /* 398 * Set up an incoming call. call->conn points to the connection. 399 * This is called in BH context and isn't allowed to fail. 400 */ 401 void rxrpc_incoming_call(struct rxrpc_sock *rx, 402 struct rxrpc_call *call, 403 struct sk_buff *skb) 404 { 405 struct rxrpc_connection *conn = call->conn; 406 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 407 u32 chan; 408 409 _enter(",%d", call->conn->debug_id); 410 411 rcu_assign_pointer(call->socket, rx); 412 call->call_id = sp->hdr.callNumber; 413 call->service_id = sp->hdr.serviceId; 414 call->cid = sp->hdr.cid; 415 call->state = RXRPC_CALL_SERVER_SECURING; 416 call->cong_tstamp = skb->tstamp; 417 418 /* Set the channel for this call. We don't get channel_lock as we're 419 * only defending against the data_ready handler (which we're called 420 * from) and the RESPONSE packet parser (which is only really 421 * interested in call_counter and can cope with a disagreement with the 422 * call pointer). 423 */ 424 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 425 conn->channels[chan].call_counter = call->call_id; 426 conn->channels[chan].call_id = call->call_id; 427 rcu_assign_pointer(conn->channels[chan].call, call); 428 429 spin_lock(&conn->params.peer->lock); 430 hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets); 431 spin_unlock(&conn->params.peer->lock); 432 433 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 434 435 rxrpc_start_call_timer(call); 436 _leave(""); 437 } 438 439 /* 440 * Queue a call's work processor, getting a ref to pass to the work queue. 441 */ 442 bool rxrpc_queue_call(struct rxrpc_call *call) 443 { 444 const void *here = __builtin_return_address(0); 445 int n; 446 447 if (!__refcount_inc_not_zero(&call->ref, &n)) 448 return false; 449 if (rxrpc_queue_work(&call->processor)) 450 trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1, 451 here, NULL); 452 else 453 rxrpc_put_call(call, rxrpc_call_put_noqueue); 454 return true; 455 } 456 457 /* 458 * Queue a call's work processor, passing the callers ref to the work queue. 459 */ 460 bool __rxrpc_queue_call(struct rxrpc_call *call) 461 { 462 const void *here = __builtin_return_address(0); 463 int n = refcount_read(&call->ref); 464 ASSERTCMP(n, >=, 1); 465 if (rxrpc_queue_work(&call->processor)) 466 trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n, 467 here, NULL); 468 else 469 rxrpc_put_call(call, rxrpc_call_put_noqueue); 470 return true; 471 } 472 473 /* 474 * Note the re-emergence of a call. 475 */ 476 void rxrpc_see_call(struct rxrpc_call *call) 477 { 478 const void *here = __builtin_return_address(0); 479 if (call) { 480 int n = refcount_read(&call->ref); 481 482 trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n, 483 here, NULL); 484 } 485 } 486 487 bool rxrpc_try_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 488 { 489 const void *here = __builtin_return_address(0); 490 int n; 491 492 if (!__refcount_inc_not_zero(&call->ref, &n)) 493 return false; 494 trace_rxrpc_call(call->debug_id, op, n + 1, here, NULL); 495 return true; 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 op) 502 { 503 const void *here = __builtin_return_address(0); 504 int n; 505 506 __refcount_inc(&call->ref, &n); 507 trace_rxrpc_call(call->debug_id, op, n + 1, here, NULL); 508 } 509 510 /* 511 * Clean up the RxTx skb ring. 512 */ 513 static void rxrpc_cleanup_ring(struct rxrpc_call *call) 514 { 515 int i; 516 517 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 518 rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned); 519 call->rxtx_buffer[i] = NULL; 520 } 521 } 522 523 /* 524 * Detach a call from its owning socket. 525 */ 526 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 527 { 528 const void *here = __builtin_return_address(0); 529 struct rxrpc_connection *conn = call->conn; 530 bool put = false; 531 532 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); 533 534 trace_rxrpc_call(call->debug_id, rxrpc_call_release, 535 refcount_read(&call->ref), 536 here, (const void *)call->flags); 537 538 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 539 540 spin_lock_bh(&call->lock); 541 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 542 BUG(); 543 spin_unlock_bh(&call->lock); 544 545 rxrpc_put_call_slot(call); 546 rxrpc_delete_call_timer(call); 547 548 /* Make sure we don't get any more notifications */ 549 write_lock_bh(&rx->recvmsg_lock); 550 551 if (!list_empty(&call->recvmsg_link)) { 552 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 553 call, call->events, call->flags); 554 list_del(&call->recvmsg_link); 555 put = true; 556 } 557 558 /* list_empty() must return false in rxrpc_notify_socket() */ 559 call->recvmsg_link.next = NULL; 560 call->recvmsg_link.prev = NULL; 561 562 write_unlock_bh(&rx->recvmsg_lock); 563 if (put) 564 rxrpc_put_call(call, rxrpc_call_put); 565 566 write_lock(&rx->call_lock); 567 568 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 569 rb_erase(&call->sock_node, &rx->calls); 570 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 571 rxrpc_put_call(call, rxrpc_call_put_userid); 572 } 573 574 list_del(&call->sock_link); 575 write_unlock(&rx->call_lock); 576 577 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 578 579 if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) 580 rxrpc_disconnect_call(call); 581 if (call->security) 582 call->security->free_call_crypto(call); 583 _leave(""); 584 } 585 586 /* 587 * release all the calls associated with a socket 588 */ 589 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 590 { 591 struct rxrpc_call *call; 592 593 _enter("%p", rx); 594 595 while (!list_empty(&rx->to_be_accepted)) { 596 call = list_entry(rx->to_be_accepted.next, 597 struct rxrpc_call, accept_link); 598 list_del(&call->accept_link); 599 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 600 rxrpc_put_call(call, rxrpc_call_put); 601 } 602 603 while (!list_empty(&rx->sock_calls)) { 604 call = list_entry(rx->sock_calls.next, 605 struct rxrpc_call, sock_link); 606 rxrpc_get_call(call, rxrpc_call_got); 607 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 608 rxrpc_send_abort_packet(call); 609 rxrpc_release_call(rx, call); 610 rxrpc_put_call(call, rxrpc_call_put); 611 } 612 613 _leave(""); 614 } 615 616 /* 617 * release a call 618 */ 619 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 620 { 621 struct rxrpc_net *rxnet = call->rxnet; 622 const void *here = __builtin_return_address(0); 623 unsigned int debug_id = call->debug_id; 624 bool dead; 625 int n; 626 627 ASSERT(call != NULL); 628 629 dead = __refcount_dec_and_test(&call->ref, &n); 630 trace_rxrpc_call(debug_id, op, n, here, NULL); 631 if (dead) { 632 _debug("call %d dead", call->debug_id); 633 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 634 635 if (!list_empty(&call->link)) { 636 spin_lock_bh(&rxnet->call_lock); 637 list_del_init(&call->link); 638 spin_unlock_bh(&rxnet->call_lock); 639 } 640 641 rxrpc_cleanup_call(call); 642 } 643 } 644 645 /* 646 * Final call destruction - but must be done in process context. 647 */ 648 static void rxrpc_destroy_call(struct work_struct *work) 649 { 650 struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor); 651 struct rxrpc_net *rxnet = call->rxnet; 652 653 rxrpc_delete_call_timer(call); 654 655 rxrpc_put_connection(call->conn); 656 rxrpc_put_peer(call->peer); 657 kfree(call->rxtx_buffer); 658 kfree(call->rxtx_annotations); 659 kmem_cache_free(rxrpc_call_jar, call); 660 if (atomic_dec_and_test(&rxnet->nr_calls)) 661 wake_up_var(&rxnet->nr_calls); 662 } 663 664 /* 665 * Final call destruction under RCU. 666 */ 667 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 668 { 669 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 670 671 if (in_softirq()) { 672 INIT_WORK(&call->processor, rxrpc_destroy_call); 673 if (!rxrpc_queue_work(&call->processor)) 674 BUG(); 675 } else { 676 rxrpc_destroy_call(&call->processor); 677 } 678 } 679 680 /* 681 * clean up a call 682 */ 683 void rxrpc_cleanup_call(struct rxrpc_call *call) 684 { 685 _net("DESTROY CALL %d", call->debug_id); 686 687 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 688 689 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 690 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 691 692 rxrpc_cleanup_ring(call); 693 rxrpc_free_skb(call->tx_pending, rxrpc_skb_cleaned); 694 695 call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 696 } 697 698 /* 699 * Make sure that all calls are gone from a network namespace. To reach this 700 * point, any open UDP sockets in that namespace must have been closed, so any 701 * outstanding calls cannot be doing I/O. 702 */ 703 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 704 { 705 struct rxrpc_call *call; 706 707 _enter(""); 708 709 if (!list_empty(&rxnet->calls)) { 710 spin_lock_bh(&rxnet->call_lock); 711 712 while (!list_empty(&rxnet->calls)) { 713 call = list_entry(rxnet->calls.next, 714 struct rxrpc_call, link); 715 _debug("Zapping call %p", call); 716 717 rxrpc_see_call(call); 718 list_del_init(&call->link); 719 720 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 721 call, refcount_read(&call->ref), 722 rxrpc_call_states[call->state], 723 call->flags, call->events); 724 725 spin_unlock_bh(&rxnet->call_lock); 726 cond_resched(); 727 spin_lock_bh(&rxnet->call_lock); 728 } 729 730 spin_unlock_bh(&rxnet->call_lock); 731 } 732 733 atomic_dec(&rxnet->nr_calls); 734 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 735 } 736