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 DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000); 44 static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000); 45 46 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what) 47 { 48 struct rxrpc_local *local = call->local; 49 bool busy; 50 51 if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) { 52 spin_lock_bh(&local->lock); 53 busy = !list_empty(&call->attend_link); 54 trace_rxrpc_poke_call(call, busy, what); 55 if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke)) 56 busy = true; 57 if (!busy) { 58 list_add_tail(&call->attend_link, &local->call_attend_q); 59 } 60 spin_unlock_bh(&local->lock); 61 if (!busy) 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 (!__rxrpc_call_is_complete(call)) { 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->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 refcount_set(&call->ref, 1); 166 call->debug_id = debug_id; 167 call->tx_total_len = -1; 168 call->next_rx_timo = 20 * HZ; 169 call->next_req_timo = 1 * HZ; 170 call->ackr_window = 1; 171 call->ackr_wtop = 1; 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->dest_srx = *srx; 215 call->interruptibility = p->interruptibility; 216 call->tx_total_len = p->tx_total_len; 217 call->key = key_get(cp->key); 218 call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call); 219 call->security_level = cp->security_level; 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_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret); 230 rxrpc_put_call(call, rxrpc_call_put_discard_error); 231 return ERR_PTR(ret); 232 } 233 234 rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN); 235 236 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 237 p->user_call_ID, rxrpc_call_new_client); 238 239 _leave(" = %p", call); 240 return call; 241 } 242 243 /* 244 * Initiate the call ack/resend/expiry timer. 245 */ 246 void rxrpc_start_call_timer(struct rxrpc_call *call) 247 { 248 unsigned long now = jiffies; 249 unsigned long j = now + MAX_JIFFY_OFFSET; 250 251 call->delay_ack_at = j; 252 call->ack_lost_at = j; 253 call->resend_at = j; 254 call->ping_at = j; 255 call->keepalive_at = j; 256 call->expect_rx_by = j; 257 call->expect_req_by = j; 258 call->expect_term_by = j; 259 call->timer.expires = now; 260 } 261 262 /* 263 * Wait for a call slot to become available. 264 */ 265 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) 266 { 267 struct semaphore *limiter = &rxrpc_call_limiter; 268 269 if (p->kernel) 270 limiter = &rxrpc_kernel_call_limiter; 271 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { 272 down(limiter); 273 return limiter; 274 } 275 return down_interruptible(limiter) < 0 ? NULL : limiter; 276 } 277 278 /* 279 * Release a call slot. 280 */ 281 static void rxrpc_put_call_slot(struct rxrpc_call *call) 282 { 283 struct semaphore *limiter = &rxrpc_call_limiter; 284 285 if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) 286 limiter = &rxrpc_kernel_call_limiter; 287 up(limiter); 288 } 289 290 /* 291 * Start the process of connecting a call. We obtain a peer and a connection 292 * bundle, but the actual association of a call with a connection is offloaded 293 * to the I/O thread to simplify locking. 294 */ 295 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp) 296 { 297 struct rxrpc_local *local = call->local; 298 int ret = -ENOMEM; 299 300 _enter("{%d,%lx},", call->debug_id, call->user_call_ID); 301 302 call->peer = rxrpc_lookup_peer(local, &call->dest_srx, gfp); 303 if (!call->peer) 304 goto error; 305 306 ret = rxrpc_look_up_bundle(call, gfp); 307 if (ret < 0) 308 goto error; 309 310 trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call); 311 rxrpc_get_call(call, rxrpc_call_get_io_thread); 312 spin_lock(&local->client_call_lock); 313 list_add_tail(&call->wait_link, &local->new_client_calls); 314 spin_unlock(&local->client_call_lock); 315 rxrpc_wake_up_io_thread(local); 316 return 0; 317 318 error: 319 __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); 320 return ret; 321 } 322 323 /* 324 * Set up a call for the given parameters. 325 * - Called with the socket lock held, which it must release. 326 * - If it returns a call, the call's lock will need releasing by the caller. 327 */ 328 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 329 struct rxrpc_conn_parameters *cp, 330 struct sockaddr_rxrpc *srx, 331 struct rxrpc_call_params *p, 332 gfp_t gfp, 333 unsigned int debug_id) 334 __releases(&rx->sk.sk_lock.slock) 335 __acquires(&call->user_mutex) 336 { 337 struct rxrpc_call *call, *xcall; 338 struct rxrpc_net *rxnet; 339 struct semaphore *limiter; 340 struct rb_node *parent, **pp; 341 int ret; 342 343 _enter("%p,%lx", rx, p->user_call_ID); 344 345 limiter = rxrpc_get_call_slot(p, gfp); 346 if (!limiter) { 347 release_sock(&rx->sk); 348 return ERR_PTR(-ERESTARTSYS); 349 } 350 351 call = rxrpc_alloc_client_call(rx, srx, cp, p, gfp, debug_id); 352 if (IS_ERR(call)) { 353 release_sock(&rx->sk); 354 up(limiter); 355 _leave(" = %ld", PTR_ERR(call)); 356 return call; 357 } 358 359 /* We need to protect a partially set up call against the user as we 360 * will be acting outside the socket lock. 361 */ 362 mutex_lock(&call->user_mutex); 363 364 /* Publish the call, even though it is incompletely set up as yet */ 365 write_lock(&rx->call_lock); 366 367 pp = &rx->calls.rb_node; 368 parent = NULL; 369 while (*pp) { 370 parent = *pp; 371 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 372 373 if (p->user_call_ID < xcall->user_call_ID) 374 pp = &(*pp)->rb_left; 375 else if (p->user_call_ID > xcall->user_call_ID) 376 pp = &(*pp)->rb_right; 377 else 378 goto error_dup_user_ID; 379 } 380 381 rcu_assign_pointer(call->socket, rx); 382 call->user_call_ID = p->user_call_ID; 383 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 384 rxrpc_get_call(call, rxrpc_call_get_userid); 385 rb_link_node(&call->sock_node, parent, pp); 386 rb_insert_color(&call->sock_node, &rx->calls); 387 list_add(&call->sock_link, &rx->sock_calls); 388 389 write_unlock(&rx->call_lock); 390 391 rxnet = call->rxnet; 392 spin_lock(&rxnet->call_lock); 393 list_add_tail_rcu(&call->link, &rxnet->calls); 394 spin_unlock(&rxnet->call_lock); 395 396 /* From this point on, the call is protected by its own lock. */ 397 release_sock(&rx->sk); 398 399 /* Set up or get a connection record and set the protocol parameters, 400 * including channel number and call ID. 401 */ 402 ret = rxrpc_connect_call(call, gfp); 403 if (ret < 0) 404 goto error_attached_to_socket; 405 406 _leave(" = %p [new]", call); 407 return call; 408 409 /* We unexpectedly found the user ID in the list after taking 410 * the call_lock. This shouldn't happen unless the user races 411 * with itself and tries to add the same user ID twice at the 412 * same time in different threads. 413 */ 414 error_dup_user_ID: 415 write_unlock(&rx->call_lock); 416 release_sock(&rx->sk); 417 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST); 418 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0, 419 rxrpc_call_see_userid_exists); 420 mutex_unlock(&call->user_mutex); 421 rxrpc_put_call(call, rxrpc_call_put_userid_exists); 422 _leave(" = -EEXIST"); 423 return ERR_PTR(-EEXIST); 424 425 /* We got an error, but the call is attached to the socket and is in 426 * need of release. However, we might now race with recvmsg() when it 427 * completion notifies the socket. Return 0 from sys_sendmsg() and 428 * leave the error to recvmsg() to deal with. 429 */ 430 error_attached_to_socket: 431 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret, 432 rxrpc_call_see_connect_failed); 433 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret); 434 _leave(" = c=%08x [err]", call->debug_id); 435 return call; 436 } 437 438 /* 439 * Set up an incoming call. call->conn points to the connection. 440 * This is called in BH context and isn't allowed to fail. 441 */ 442 void rxrpc_incoming_call(struct rxrpc_sock *rx, 443 struct rxrpc_call *call, 444 struct sk_buff *skb) 445 { 446 struct rxrpc_connection *conn = call->conn; 447 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 448 u32 chan; 449 450 _enter(",%d", call->conn->debug_id); 451 452 rcu_assign_pointer(call->socket, rx); 453 call->call_id = sp->hdr.callNumber; 454 call->dest_srx.srx_service = sp->hdr.serviceId; 455 call->cid = sp->hdr.cid; 456 call->cong_tstamp = skb->tstamp; 457 458 __set_bit(RXRPC_CALL_EXPOSED, &call->flags); 459 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING); 460 461 spin_lock(&conn->state_lock); 462 463 switch (conn->state) { 464 case RXRPC_CONN_SERVICE_UNSECURED: 465 case RXRPC_CONN_SERVICE_CHALLENGING: 466 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING); 467 break; 468 case RXRPC_CONN_SERVICE: 469 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST); 470 break; 471 472 case RXRPC_CONN_ABORTED: 473 rxrpc_set_call_completion(call, conn->completion, 474 conn->abort_code, conn->error); 475 break; 476 default: 477 BUG(); 478 } 479 480 rxrpc_get_call(call, rxrpc_call_get_io_thread); 481 482 /* Set the channel for this call. We don't get channel_lock as we're 483 * only defending against the data_ready handler (which we're called 484 * from) and the RESPONSE packet parser (which is only really 485 * interested in call_counter and can cope with a disagreement with the 486 * call pointer). 487 */ 488 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 489 conn->channels[chan].call_counter = call->call_id; 490 conn->channels[chan].call_id = call->call_id; 491 conn->channels[chan].call = call; 492 spin_unlock(&conn->state_lock); 493 494 spin_lock(&conn->peer->lock); 495 hlist_add_head(&call->error_link, &conn->peer->error_targets); 496 spin_unlock(&conn->peer->lock); 497 498 rxrpc_start_call_timer(call); 499 _leave(""); 500 } 501 502 /* 503 * Note the re-emergence of a call. 504 */ 505 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 506 { 507 if (call) { 508 int r = refcount_read(&call->ref); 509 510 trace_rxrpc_call(call->debug_id, r, 0, why); 511 } 512 } 513 514 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call, 515 enum rxrpc_call_trace why) 516 { 517 int r; 518 519 if (!call || !__refcount_inc_not_zero(&call->ref, &r)) 520 return NULL; 521 trace_rxrpc_call(call->debug_id, r + 1, 0, why); 522 return call; 523 } 524 525 /* 526 * Note the addition of a ref on a call. 527 */ 528 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 529 { 530 int r; 531 532 __refcount_inc(&call->ref, &r); 533 trace_rxrpc_call(call->debug_id, r + 1, 0, why); 534 } 535 536 /* 537 * Clean up the Rx skb ring. 538 */ 539 static void rxrpc_cleanup_ring(struct rxrpc_call *call) 540 { 541 skb_queue_purge(&call->recvmsg_queue); 542 skb_queue_purge(&call->rx_oos_queue); 543 } 544 545 /* 546 * Detach a call from its owning socket. 547 */ 548 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 549 { 550 struct rxrpc_connection *conn = call->conn; 551 bool put = false, putu = false; 552 553 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); 554 555 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 556 call->flags, rxrpc_call_see_release); 557 558 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 559 BUG(); 560 561 rxrpc_put_call_slot(call); 562 563 /* Make sure we don't get any more notifications */ 564 spin_lock(&rx->recvmsg_lock); 565 566 if (!list_empty(&call->recvmsg_link)) { 567 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 568 call, call->events, call->flags); 569 list_del(&call->recvmsg_link); 570 put = true; 571 } 572 573 /* list_empty() must return false in rxrpc_notify_socket() */ 574 call->recvmsg_link.next = NULL; 575 call->recvmsg_link.prev = NULL; 576 577 spin_unlock(&rx->recvmsg_lock); 578 if (put) 579 rxrpc_put_call(call, rxrpc_call_put_unnotify); 580 581 write_lock(&rx->call_lock); 582 583 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 584 rb_erase(&call->sock_node, &rx->calls); 585 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 586 putu = true; 587 } 588 589 list_del(&call->sock_link); 590 write_unlock(&rx->call_lock); 591 592 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 593 594 if (putu) 595 rxrpc_put_call(call, rxrpc_call_put_userid); 596 597 _leave(""); 598 } 599 600 /* 601 * release all the calls associated with a socket 602 */ 603 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 604 { 605 struct rxrpc_call *call; 606 607 _enter("%p", rx); 608 609 while (!list_empty(&rx->to_be_accepted)) { 610 call = list_entry(rx->to_be_accepted.next, 611 struct rxrpc_call, accept_link); 612 list_del(&call->accept_link); 613 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, 614 rxrpc_abort_call_sock_release_tba); 615 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba); 616 } 617 618 while (!list_empty(&rx->sock_calls)) { 619 call = list_entry(rx->sock_calls.next, 620 struct rxrpc_call, sock_link); 621 rxrpc_get_call(call, rxrpc_call_get_release_sock); 622 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, 623 rxrpc_abort_call_sock_release); 624 rxrpc_release_call(rx, call); 625 rxrpc_put_call(call, rxrpc_call_put_release_sock); 626 } 627 628 _leave(""); 629 } 630 631 /* 632 * release a call 633 */ 634 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 635 { 636 struct rxrpc_net *rxnet = call->rxnet; 637 unsigned int debug_id = call->debug_id; 638 bool dead; 639 int r; 640 641 ASSERT(call != NULL); 642 643 dead = __refcount_dec_and_test(&call->ref, &r); 644 trace_rxrpc_call(debug_id, r - 1, 0, why); 645 if (dead) { 646 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); 647 648 if (!list_empty(&call->link)) { 649 spin_lock(&rxnet->call_lock); 650 list_del_init(&call->link); 651 spin_unlock(&rxnet->call_lock); 652 } 653 654 rxrpc_cleanup_call(call); 655 } 656 } 657 658 /* 659 * Free up the call under RCU. 660 */ 661 static void rxrpc_rcu_free_call(struct rcu_head *rcu) 662 { 663 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 664 struct rxrpc_net *rxnet = READ_ONCE(call->rxnet); 665 666 kmem_cache_free(rxrpc_call_jar, call); 667 if (atomic_dec_and_test(&rxnet->nr_calls)) 668 wake_up_var(&rxnet->nr_calls); 669 } 670 671 /* 672 * Final call destruction - but must be done in process context. 673 */ 674 static void rxrpc_destroy_call(struct work_struct *work) 675 { 676 struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer); 677 struct rxrpc_txbuf *txb; 678 679 del_timer_sync(&call->timer); 680 681 rxrpc_cleanup_ring(call); 682 while ((txb = list_first_entry_or_null(&call->tx_sendmsg, 683 struct rxrpc_txbuf, call_link))) { 684 list_del(&txb->call_link); 685 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); 686 } 687 while ((txb = list_first_entry_or_null(&call->tx_buffer, 688 struct rxrpc_txbuf, call_link))) { 689 list_del(&txb->call_link); 690 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); 691 } 692 693 rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned); 694 rxrpc_put_connection(call->conn, rxrpc_conn_put_call); 695 rxrpc_deactivate_bundle(call->bundle); 696 rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call); 697 rxrpc_put_peer(call->peer, rxrpc_peer_put_call); 698 rxrpc_put_local(call->local, rxrpc_local_put_call); 699 call_rcu(&call->rcu, rxrpc_rcu_free_call); 700 } 701 702 /* 703 * clean up a call 704 */ 705 void rxrpc_cleanup_call(struct rxrpc_call *call) 706 { 707 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 708 709 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); 710 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 711 712 del_timer(&call->timer); 713 714 if (rcu_read_lock_held()) 715 /* Can't use the rxrpc workqueue as we need to cancel/flush 716 * something that may be running/waiting there. 717 */ 718 schedule_work(&call->destroyer); 719 else 720 rxrpc_destroy_call(&call->destroyer); 721 } 722 723 /* 724 * Make sure that all calls are gone from a network namespace. To reach this 725 * point, any open UDP sockets in that namespace must have been closed, so any 726 * outstanding calls cannot be doing I/O. 727 */ 728 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 729 { 730 struct rxrpc_call *call; 731 732 _enter(""); 733 734 if (!list_empty(&rxnet->calls)) { 735 spin_lock(&rxnet->call_lock); 736 737 while (!list_empty(&rxnet->calls)) { 738 call = list_entry(rxnet->calls.next, 739 struct rxrpc_call, link); 740 _debug("Zapping call %p", call); 741 742 rxrpc_see_call(call, rxrpc_call_see_zap); 743 list_del_init(&call->link); 744 745 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 746 call, refcount_read(&call->ref), 747 rxrpc_call_states[__rxrpc_call_state(call)], 748 call->flags, call->events); 749 750 spin_unlock(&rxnet->call_lock); 751 cond_resched(); 752 spin_lock(&rxnet->call_lock); 753 } 754 755 spin_unlock(&rxnet->call_lock); 756 } 757 758 atomic_dec(&rxnet->nr_calls); 759 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 760 } 761