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_RECV_REQUEST] = "SvRcvReq", 26 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", 27 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", 28 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", 29 [RXRPC_CALL_COMPLETE] = "Complete", 30 }; 31 32 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { 33 [RXRPC_CALL_SUCCEEDED] = "Complete", 34 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", 35 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", 36 [RXRPC_CALL_LOCAL_ERROR] = "LocError", 37 [RXRPC_CALL_NETWORK_ERROR] = "NetError", 38 }; 39 40 struct kmem_cache *rxrpc_call_jar; 41 42 static DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000); 43 static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000); 44 45 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what) 46 { 47 struct rxrpc_local *local = call->local; 48 bool busy; 49 50 if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) { 51 spin_lock_irq(&local->lock); 52 busy = !list_empty(&call->attend_link); 53 trace_rxrpc_poke_call(call, busy, what); 54 if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke)) 55 busy = true; 56 if (!busy) { 57 list_add_tail(&call->attend_link, &local->call_attend_q); 58 } 59 spin_unlock_irq(&local->lock); 60 if (!busy) 61 rxrpc_wake_up_io_thread(local); 62 } 63 } 64 65 static void rxrpc_call_timer_expired(struct timer_list *t) 66 { 67 struct rxrpc_call *call = timer_container_of(call, t, timer); 68 69 _enter("%d", call->debug_id); 70 71 if (!__rxrpc_call_is_complete(call)) { 72 trace_rxrpc_timer_expired(call); 73 rxrpc_poke_call(call, rxrpc_call_poke_timer); 74 } 75 } 76 77 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 78 79 static void rxrpc_destroy_call(struct work_struct *); 80 81 /* 82 * find an extant server call 83 * - called in process context with IRQs enabled 84 */ 85 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 86 unsigned long user_call_ID) 87 { 88 struct rxrpc_call *call; 89 struct rb_node *p; 90 91 _enter("%p,%lx", rx, user_call_ID); 92 93 read_lock(&rx->call_lock); 94 95 p = rx->calls.rb_node; 96 while (p) { 97 call = rb_entry(p, struct rxrpc_call, sock_node); 98 99 if (user_call_ID < call->user_call_ID) 100 p = p->rb_left; 101 else if (user_call_ID > call->user_call_ID) 102 p = p->rb_right; 103 else 104 goto found_extant_call; 105 } 106 107 read_unlock(&rx->call_lock); 108 _leave(" = NULL"); 109 return NULL; 110 111 found_extant_call: 112 rxrpc_get_call(call, rxrpc_call_get_sendmsg); 113 read_unlock(&rx->call_lock); 114 _leave(" = %p [%d]", call, refcount_read(&call->ref)); 115 return call; 116 } 117 118 /* 119 * allocate a new call 120 */ 121 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, 122 unsigned int debug_id) 123 { 124 struct rxrpc_call *call; 125 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 126 127 call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 128 if (!call) 129 return NULL; 130 131 mutex_init(&call->user_mutex); 132 133 /* Prevent lockdep reporting a deadlock false positive between the afs 134 * filesystem and sys_sendmsg() via the mmap sem. 135 */ 136 if (rx->sk.sk_kern_sock) 137 lockdep_set_class(&call->user_mutex, 138 &rxrpc_call_user_mutex_lock_class_key); 139 140 timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 141 INIT_WORK(&call->destroyer, rxrpc_destroy_call); 142 INIT_LIST_HEAD(&call->link); 143 INIT_LIST_HEAD(&call->wait_link); 144 INIT_LIST_HEAD(&call->accept_link); 145 INIT_LIST_HEAD(&call->recvmsg_link); 146 INIT_LIST_HEAD(&call->sock_link); 147 INIT_LIST_HEAD(&call->attend_link); 148 skb_queue_head_init(&call->recvmsg_queue); 149 skb_queue_head_init(&call->rx_queue); 150 skb_queue_head_init(&call->rx_oos_queue); 151 init_waitqueue_head(&call->waitq); 152 spin_lock_init(&call->notify_lock); 153 refcount_set(&call->ref, 1); 154 call->debug_id = debug_id; 155 call->tx_total_len = -1; 156 call->tx_jumbo_max = 1; 157 call->next_rx_timo = 20 * HZ; 158 call->next_req_timo = 1 * HZ; 159 call->ackr_window = 1; 160 call->ackr_wtop = 1; 161 call->delay_ack_at = KTIME_MAX; 162 call->rack_timo_at = KTIME_MAX; 163 call->ping_at = KTIME_MAX; 164 call->keepalive_at = KTIME_MAX; 165 call->expect_rx_by = KTIME_MAX; 166 call->expect_req_by = KTIME_MAX; 167 call->expect_term_by = KTIME_MAX; 168 169 memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 170 171 call->rx_winsize = rxrpc_rx_window_size; 172 call->tx_winsize = 16; 173 174 call->cong_cwnd = RXRPC_MIN_CWND; 175 call->cong_ssthresh = RXRPC_TX_MAX_WINDOW; 176 177 rxrpc_call_init_rtt(call); 178 179 call->rxnet = rxnet; 180 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; 181 atomic_inc(&rxnet->nr_calls); 182 return call; 183 } 184 185 /* 186 * Allocate a new client call. 187 */ 188 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 189 struct rxrpc_conn_parameters *cp, 190 struct rxrpc_call_params *p, 191 gfp_t gfp, 192 unsigned int debug_id) 193 { 194 struct rxrpc_call *call; 195 ktime_t now; 196 int ret; 197 198 _enter(""); 199 200 call = rxrpc_alloc_call(rx, gfp, debug_id); 201 if (!call) 202 return ERR_PTR(-ENOMEM); 203 now = ktime_get_real(); 204 call->acks_latest_ts = now; 205 call->cong_tstamp = now; 206 call->dest_srx = cp->peer->srx; 207 call->dest_srx.srx_service = cp->service_id; 208 call->interruptibility = p->interruptibility; 209 call->tx_total_len = p->tx_total_len; 210 call->key = key_get(cp->key); 211 call->peer = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call); 212 call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call); 213 call->security_level = cp->security_level; 214 if (p->kernel) 215 __set_bit(RXRPC_CALL_KERNEL, &call->flags); 216 if (cp->upgrade) 217 __set_bit(RXRPC_CALL_UPGRADE, &call->flags); 218 if (cp->exclusive) 219 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags); 220 221 if (p->timeouts.normal) 222 call->next_rx_timo = umin(p->timeouts.normal, 1); 223 if (p->timeouts.idle) 224 call->next_req_timo = umin(p->timeouts.idle, 1); 225 if (p->timeouts.hard) 226 call->hard_timo = p->timeouts.hard; 227 228 ret = rxrpc_init_client_call_security(call); 229 if (ret < 0) { 230 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret); 231 rxrpc_put_call(call, rxrpc_call_put_discard_error); 232 return ERR_PTR(ret); 233 } 234 235 rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN); 236 237 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 238 p->user_call_ID, rxrpc_call_new_client); 239 240 _leave(" = %p", call); 241 return call; 242 } 243 244 /* 245 * Initiate the call ack/resend/expiry timer. 246 */ 247 void rxrpc_start_call_timer(struct rxrpc_call *call) 248 { 249 if (call->hard_timo) { 250 ktime_t delay = ms_to_ktime(call->hard_timo * 1000); 251 252 call->expect_term_by = ktime_add(ktime_get_real(), delay); 253 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard); 254 } 255 call->timer.expires = jiffies; 256 } 257 258 /* 259 * Wait for a call slot to become available. 260 */ 261 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) 262 { 263 struct semaphore *limiter = &rxrpc_call_limiter; 264 265 if (p->kernel) 266 limiter = &rxrpc_kernel_call_limiter; 267 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { 268 down(limiter); 269 return limiter; 270 } 271 return down_interruptible(limiter) < 0 ? NULL : limiter; 272 } 273 274 /* 275 * Release a call slot. 276 */ 277 static void rxrpc_put_call_slot(struct rxrpc_call *call) 278 { 279 struct semaphore *limiter = &rxrpc_call_limiter; 280 281 if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) 282 limiter = &rxrpc_kernel_call_limiter; 283 up(limiter); 284 } 285 286 /* 287 * Start the process of connecting a call. We obtain a peer and a connection 288 * bundle, but the actual association of a call with a connection is offloaded 289 * to the I/O thread to simplify locking. 290 */ 291 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp) 292 { 293 struct rxrpc_local *local = call->local; 294 int ret = -ENOMEM; 295 296 _enter("{%d,%lx},", call->debug_id, call->user_call_ID); 297 298 ret = rxrpc_look_up_bundle(call, gfp); 299 if (ret < 0) 300 goto error; 301 302 trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call); 303 rxrpc_get_call(call, rxrpc_call_get_io_thread); 304 spin_lock_irq(&local->client_call_lock); 305 list_add_tail(&call->wait_link, &local->new_client_calls); 306 spin_unlock_irq(&local->client_call_lock); 307 rxrpc_wake_up_io_thread(local); 308 return 0; 309 310 error: 311 __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); 312 return ret; 313 } 314 315 /* 316 * Set up a call for the given parameters. 317 * - Called with the socket lock held, which it must release. 318 * - If it returns a call, the call's lock will need releasing by the caller. 319 */ 320 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 321 struct rxrpc_conn_parameters *cp, 322 struct rxrpc_call_params *p, 323 gfp_t gfp, 324 unsigned int debug_id) 325 __releases(&rx->sk.sk_lock) 326 __acquires(&call->user_mutex) 327 { 328 struct rxrpc_call *call, *xcall; 329 struct rxrpc_net *rxnet; 330 struct semaphore *limiter; 331 struct rb_node *parent, **pp; 332 int ret; 333 334 _enter("%p,%lx", rx, p->user_call_ID); 335 336 if (WARN_ON_ONCE(!cp->peer)) { 337 release_sock(&rx->sk); 338 return ERR_PTR(-EIO); 339 } 340 341 limiter = rxrpc_get_call_slot(p, gfp); 342 if (!limiter) { 343 release_sock(&rx->sk); 344 return ERR_PTR(-ERESTARTSYS); 345 } 346 347 call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id); 348 if (IS_ERR(call)) { 349 release_sock(&rx->sk); 350 up(limiter); 351 _leave(" = %ld", PTR_ERR(call)); 352 return call; 353 } 354 355 /* We need to protect a partially set up call against the user as we 356 * will be acting outside the socket lock. 357 */ 358 mutex_lock(&call->user_mutex); 359 360 /* Publish the call, even though it is incompletely set up as yet */ 361 write_lock(&rx->call_lock); 362 363 pp = &rx->calls.rb_node; 364 parent = NULL; 365 while (*pp) { 366 parent = *pp; 367 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 368 369 if (p->user_call_ID < xcall->user_call_ID) 370 pp = &(*pp)->rb_left; 371 else if (p->user_call_ID > xcall->user_call_ID) 372 pp = &(*pp)->rb_right; 373 else 374 goto error_dup_user_ID; 375 } 376 377 rcu_assign_pointer(call->socket, rx); 378 call->user_call_ID = p->user_call_ID; 379 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 380 rxrpc_get_call(call, rxrpc_call_get_userid); 381 rb_link_node(&call->sock_node, parent, pp); 382 rb_insert_color(&call->sock_node, &rx->calls); 383 list_add(&call->sock_link, &rx->sock_calls); 384 385 write_unlock(&rx->call_lock); 386 387 rxnet = call->rxnet; 388 spin_lock(&rxnet->call_lock); 389 list_add_tail_rcu(&call->link, &rxnet->calls); 390 spin_unlock(&rxnet->call_lock); 391 392 /* From this point on, the call is protected by its own lock. */ 393 release_sock(&rx->sk); 394 395 /* Set up or get a connection record and set the protocol parameters, 396 * including channel number and call ID. 397 */ 398 ret = rxrpc_connect_call(call, gfp); 399 if (ret < 0) 400 goto error_attached_to_socket; 401 402 _leave(" = %p [new]", call); 403 return call; 404 405 /* We unexpectedly found the user ID in the list after taking 406 * the call_lock. This shouldn't happen unless the user races 407 * with itself and tries to add the same user ID twice at the 408 * same time in different threads. 409 */ 410 error_dup_user_ID: 411 write_unlock(&rx->call_lock); 412 release_sock(&rx->sk); 413 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST); 414 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0, 415 rxrpc_call_see_userid_exists); 416 mutex_unlock(&call->user_mutex); 417 rxrpc_put_call(call, rxrpc_call_put_userid_exists); 418 _leave(" = -EEXIST"); 419 return ERR_PTR(-EEXIST); 420 421 /* We got an error, but the call is attached to the socket and is in 422 * need of release. However, we might now race with recvmsg() when it 423 * completion notifies the socket. Return 0 from sys_sendmsg() and 424 * leave the error to recvmsg() to deal with. 425 */ 426 error_attached_to_socket: 427 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret, 428 rxrpc_call_see_connect_failed); 429 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret); 430 _leave(" = c=%08x [err]", call->debug_id); 431 return call; 432 } 433 434 /* 435 * Set up an incoming call. call->conn points to the connection. 436 * This is called with interrupts disabled and isn't allowed to fail. 437 */ 438 void rxrpc_incoming_call(struct rxrpc_sock *rx, 439 struct rxrpc_call *call, 440 struct sk_buff *skb) 441 { 442 struct rxrpc_connection *conn = call->conn; 443 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 444 u32 chan; 445 446 _enter(",%d", call->conn->debug_id); 447 448 rcu_assign_pointer(call->socket, rx); 449 call->call_id = sp->hdr.callNumber; 450 call->dest_srx.srx_service = sp->hdr.serviceId; 451 call->cid = sp->hdr.cid; 452 call->cong_tstamp = skb->tstamp; 453 454 __set_bit(RXRPC_CALL_EXPOSED, &call->flags); 455 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST); 456 457 spin_lock(&conn->state_lock); 458 459 switch (conn->state) { 460 case RXRPC_CONN_SERVICE_UNSECURED: 461 case RXRPC_CONN_SERVICE_CHALLENGING: 462 __set_bit(RXRPC_CALL_CONN_CHALLENGING, &call->flags); 463 break; 464 case RXRPC_CONN_SERVICE: 465 break; 466 467 case RXRPC_CONN_ABORTED: 468 rxrpc_set_call_completion(call, conn->completion, 469 conn->abort_code, conn->error); 470 break; 471 default: 472 BUG(); 473 } 474 475 rxrpc_get_call(call, rxrpc_call_get_io_thread); 476 477 /* Set the channel for this call. We don't get channel_lock as we're 478 * only defending against the data_ready handler (which we're called 479 * from) and the RESPONSE packet parser (which is only really 480 * interested in call_counter and can cope with a disagreement with the 481 * call pointer). 482 */ 483 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 484 conn->channels[chan].call_counter = call->call_id; 485 conn->channels[chan].call_id = call->call_id; 486 conn->channels[chan].call = call; 487 spin_unlock(&conn->state_lock); 488 489 spin_lock(&conn->peer->lock); 490 hlist_add_head(&call->error_link, &conn->peer->error_targets); 491 spin_unlock(&conn->peer->lock); 492 493 rxrpc_start_call_timer(call); 494 _leave(""); 495 } 496 497 /* 498 * Note the re-emergence of a call. 499 */ 500 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 501 { 502 if (call) { 503 int r = refcount_read(&call->ref); 504 505 trace_rxrpc_call(call->debug_id, r, 0, why); 506 } 507 } 508 509 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call, 510 enum rxrpc_call_trace why) 511 { 512 int r; 513 514 if (!call || !__refcount_inc_not_zero(&call->ref, &r)) 515 return NULL; 516 trace_rxrpc_call(call->debug_id, r + 1, 0, why); 517 return call; 518 } 519 520 /* 521 * Note the addition of a ref on a call. 522 */ 523 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 524 { 525 int r; 526 527 __refcount_inc(&call->ref, &r); 528 trace_rxrpc_call(call->debug_id, r + 1, 0, why); 529 } 530 531 /* 532 * Clean up the transmission buffers. 533 */ 534 static void rxrpc_cleanup_tx_buffers(struct rxrpc_call *call) 535 { 536 struct rxrpc_txqueue *tq, *next; 537 538 for (tq = call->tx_queue; tq; tq = next) { 539 next = tq->next; 540 for (int i = 0; i < RXRPC_NR_TXQUEUE; i++) 541 if (tq->bufs[i]) 542 rxrpc_put_txbuf(tq->bufs[i], rxrpc_txbuf_put_cleaned); 543 trace_rxrpc_tq(call, tq, 0, rxrpc_tq_cleaned); 544 kfree(tq); 545 } 546 } 547 548 /* 549 * Clean up the receive buffers. 550 */ 551 static void rxrpc_cleanup_rx_buffers(struct rxrpc_call *call) 552 { 553 rxrpc_purge_queue(&call->recvmsg_queue); 554 rxrpc_purge_queue(&call->rx_queue); 555 rxrpc_purge_queue(&call->rx_oos_queue); 556 } 557 558 /* 559 * Detach a call from its owning socket. 560 */ 561 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 562 { 563 struct rxrpc_connection *conn = call->conn; 564 bool put = false, putu = false; 565 566 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); 567 568 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 569 call->flags, rxrpc_call_see_release); 570 571 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 572 BUG(); 573 574 rxrpc_put_call_slot(call); 575 576 /* Make sure we don't get any more notifications */ 577 spin_lock_irq(&rx->recvmsg_lock); 578 579 if (!list_empty(&call->recvmsg_link)) { 580 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 581 call, call->events, call->flags); 582 list_del(&call->recvmsg_link); 583 put = true; 584 } 585 586 /* list_empty() must return false in rxrpc_notify_socket() */ 587 call->recvmsg_link.next = NULL; 588 call->recvmsg_link.prev = NULL; 589 590 spin_unlock_irq(&rx->recvmsg_lock); 591 if (put) 592 rxrpc_put_call(call, rxrpc_call_put_unnotify); 593 594 write_lock(&rx->call_lock); 595 596 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 597 rb_erase(&call->sock_node, &rx->calls); 598 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 599 putu = true; 600 } 601 602 list_del(&call->sock_link); 603 write_unlock(&rx->call_lock); 604 605 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 606 607 if (putu) 608 rxrpc_put_call(call, rxrpc_call_put_userid); 609 610 _leave(""); 611 } 612 613 /* 614 * release all the calls associated with a socket 615 */ 616 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 617 { 618 struct rxrpc_call *call; 619 620 _enter("%p", rx); 621 622 while (!list_empty(&rx->to_be_accepted)) { 623 call = list_entry(rx->to_be_accepted.next, 624 struct rxrpc_call, accept_link); 625 list_del(&call->accept_link); 626 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, 627 rxrpc_abort_call_sock_release_tba); 628 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba); 629 } 630 631 while (!list_empty(&rx->sock_calls)) { 632 call = list_entry(rx->sock_calls.next, 633 struct rxrpc_call, sock_link); 634 rxrpc_get_call(call, rxrpc_call_get_release_sock); 635 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, 636 rxrpc_abort_call_sock_release); 637 rxrpc_release_call(rx, call); 638 rxrpc_put_call(call, rxrpc_call_put_release_sock); 639 } 640 641 _leave(""); 642 } 643 644 /* 645 * release a call 646 */ 647 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why) 648 { 649 struct rxrpc_net *rxnet = call->rxnet; 650 unsigned int debug_id = call->debug_id; 651 bool dead; 652 int r; 653 654 ASSERT(call != NULL); 655 656 dead = __refcount_dec_and_test(&call->ref, &r); 657 trace_rxrpc_call(debug_id, r - 1, 0, why); 658 if (dead) { 659 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); 660 661 if (!list_empty(&call->link)) { 662 spin_lock(&rxnet->call_lock); 663 list_del_init(&call->link); 664 spin_unlock(&rxnet->call_lock); 665 } 666 667 rxrpc_cleanup_call(call); 668 } 669 } 670 671 /* 672 * Free up the call under RCU. 673 */ 674 static void rxrpc_rcu_free_call(struct rcu_head *rcu) 675 { 676 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 677 struct rxrpc_net *rxnet = READ_ONCE(call->rxnet); 678 679 kmem_cache_free(rxrpc_call_jar, call); 680 if (atomic_dec_and_test(&rxnet->nr_calls)) 681 wake_up_var(&rxnet->nr_calls); 682 } 683 684 /* 685 * Final call destruction - but must be done in process context. 686 */ 687 static void rxrpc_destroy_call(struct work_struct *work) 688 { 689 struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer); 690 691 timer_delete_sync(&call->timer); 692 693 rxrpc_cleanup_tx_buffers(call); 694 rxrpc_cleanup_rx_buffers(call); 695 rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned); 696 rxrpc_put_connection(call->conn, rxrpc_conn_put_call); 697 rxrpc_deactivate_bundle(call->bundle); 698 rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call); 699 rxrpc_put_peer(call->peer, rxrpc_peer_put_call); 700 rxrpc_put_local(call->local, rxrpc_local_put_call); 701 call_rcu(&call->rcu, rxrpc_rcu_free_call); 702 } 703 704 /* 705 * clean up a call 706 */ 707 void rxrpc_cleanup_call(struct rxrpc_call *call) 708 { 709 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 710 711 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); 712 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 713 714 timer_delete(&call->timer); 715 716 if (rcu_read_lock_held()) 717 /* Can't use the rxrpc workqueue as we need to cancel/flush 718 * something that may be running/waiting there. 719 */ 720 schedule_work(&call->destroyer); 721 else 722 rxrpc_destroy_call(&call->destroyer); 723 } 724 725 /* 726 * Make sure that all calls are gone from a network namespace. To reach this 727 * point, any open UDP sockets in that namespace must have been closed, so any 728 * outstanding calls cannot be doing I/O. 729 */ 730 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 731 { 732 struct rxrpc_call *call; 733 734 _enter(""); 735 736 if (!list_empty(&rxnet->calls)) { 737 spin_lock(&rxnet->call_lock); 738 739 while (!list_empty(&rxnet->calls)) { 740 call = list_entry(rxnet->calls.next, 741 struct rxrpc_call, link); 742 _debug("Zapping call %p", call); 743 744 rxrpc_see_call(call, rxrpc_call_see_zap); 745 list_del_init(&call->link); 746 747 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 748 call, refcount_read(&call->ref), 749 rxrpc_call_states[__rxrpc_call_state(call)], 750 call->flags, call->events); 751 752 spin_unlock(&rxnet->call_lock); 753 cond_resched(); 754 spin_lock(&rxnet->call_lock); 755 } 756 757 spin_unlock(&rxnet->call_lock); 758 } 759 760 atomic_dec(&rxnet->nr_calls); 761 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 762 } 763 764 /** 765 * rxrpc_kernel_query_call_security - Query call's security parameters 766 * @call: The call to query 767 * @_service_id: Where to return the service ID 768 * @_enctype: Where to return the "encoding type" 769 * 770 * This queries the security parameters of a call, setting *@_service_id and 771 * *@_enctype and returning the security class. 772 * 773 * Return: The security class protocol number. 774 */ 775 u8 rxrpc_kernel_query_call_security(struct rxrpc_call *call, 776 u16 *_service_id, u32 *_enctype) 777 { 778 *_service_id = call->dest_srx.srx_service; 779 *_enctype = call->security_enctype; 780 return call->security_ix; 781 } 782 EXPORT_SYMBOL(rxrpc_kernel_query_call_security); 783