1 /* RxRPC individual remote procedure call handling 2 * 3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #include <linux/slab.h> 15 #include <linux/module.h> 16 #include <linux/circ_buf.h> 17 #include <linux/spinlock_types.h> 18 #include <net/sock.h> 19 #include <net/af_rxrpc.h> 20 #include "ar-internal.h" 21 22 const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { 23 [RXRPC_CALL_UNINITIALISED] = "Uninit ", 24 [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", 25 [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", 26 [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", 27 [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", 28 [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", 29 [RXRPC_CALL_SERVER_SECURING] = "SvSecure", 30 [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", 31 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", 32 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", 33 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", 34 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", 35 [RXRPC_CALL_COMPLETE] = "Complete", 36 }; 37 38 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { 39 [RXRPC_CALL_SUCCEEDED] = "Complete", 40 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", 41 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", 42 [RXRPC_CALL_LOCAL_ERROR] = "LocError", 43 [RXRPC_CALL_NETWORK_ERROR] = "NetError", 44 }; 45 46 struct kmem_cache *rxrpc_call_jar; 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 } 58 } 59 60 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; 61 62 /* 63 * find an extant server call 64 * - called in process context with IRQs enabled 65 */ 66 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 67 unsigned long user_call_ID) 68 { 69 struct rxrpc_call *call; 70 struct rb_node *p; 71 72 _enter("%p,%lx", rx, user_call_ID); 73 74 read_lock(&rx->call_lock); 75 76 p = rx->calls.rb_node; 77 while (p) { 78 call = rb_entry(p, struct rxrpc_call, sock_node); 79 80 if (user_call_ID < call->user_call_ID) 81 p = p->rb_left; 82 else if (user_call_ID > call->user_call_ID) 83 p = p->rb_right; 84 else 85 goto found_extant_call; 86 } 87 88 read_unlock(&rx->call_lock); 89 _leave(" = NULL"); 90 return NULL; 91 92 found_extant_call: 93 rxrpc_get_call(call, rxrpc_call_got); 94 read_unlock(&rx->call_lock); 95 _leave(" = %p [%d]", call, atomic_read(&call->usage)); 96 return call; 97 } 98 99 /* 100 * allocate a new call 101 */ 102 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, 103 unsigned int debug_id) 104 { 105 struct rxrpc_call *call; 106 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 107 108 call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 109 if (!call) 110 return NULL; 111 112 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 113 sizeof(struct sk_buff *), 114 gfp); 115 if (!call->rxtx_buffer) 116 goto nomem; 117 118 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 119 if (!call->rxtx_annotations) 120 goto nomem_2; 121 122 mutex_init(&call->user_mutex); 123 124 /* Prevent lockdep reporting a deadlock false positive between the afs 125 * filesystem and sys_sendmsg() via the mmap sem. 126 */ 127 if (rx->sk.sk_kern_sock) 128 lockdep_set_class(&call->user_mutex, 129 &rxrpc_call_user_mutex_lock_class_key); 130 131 timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 132 INIT_WORK(&call->processor, &rxrpc_process_call); 133 INIT_LIST_HEAD(&call->link); 134 INIT_LIST_HEAD(&call->chan_wait_link); 135 INIT_LIST_HEAD(&call->accept_link); 136 INIT_LIST_HEAD(&call->recvmsg_link); 137 INIT_LIST_HEAD(&call->sock_link); 138 init_waitqueue_head(&call->waitq); 139 spin_lock_init(&call->lock); 140 spin_lock_init(&call->notify_lock); 141 rwlock_init(&call->state_lock); 142 atomic_set(&call->usage, 1); 143 call->debug_id = debug_id; 144 call->tx_total_len = -1; 145 call->next_rx_timo = 20 * HZ; 146 call->next_req_timo = 1 * HZ; 147 148 memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 149 150 /* Leave space in the ring to handle a maxed-out jumbo packet */ 151 call->rx_winsize = rxrpc_rx_window_size; 152 call->tx_winsize = 16; 153 call->rx_expect_next = 1; 154 155 call->cong_cwnd = 2; 156 call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 157 158 call->rxnet = rxnet; 159 atomic_inc(&rxnet->nr_calls); 160 return call; 161 162 nomem_2: 163 kfree(call->rxtx_buffer); 164 nomem: 165 kmem_cache_free(rxrpc_call_jar, call); 166 return NULL; 167 } 168 169 /* 170 * Allocate a new client call. 171 */ 172 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 173 struct sockaddr_rxrpc *srx, 174 gfp_t gfp, 175 unsigned int debug_id) 176 { 177 struct rxrpc_call *call; 178 ktime_t now; 179 180 _enter(""); 181 182 call = rxrpc_alloc_call(rx, gfp, debug_id); 183 if (!call) 184 return ERR_PTR(-ENOMEM); 185 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 186 call->service_id = srx->srx_service; 187 call->tx_phase = true; 188 now = ktime_get_real(); 189 call->acks_latest_ts = now; 190 call->cong_tstamp = now; 191 192 _leave(" = %p", call); 193 return call; 194 } 195 196 /* 197 * Initiate the call ack/resend/expiry timer. 198 */ 199 static void rxrpc_start_call_timer(struct rxrpc_call *call) 200 { 201 unsigned long now = jiffies; 202 unsigned long j = now + MAX_JIFFY_OFFSET; 203 204 call->ack_at = j; 205 call->ack_lost_at = j; 206 call->resend_at = j; 207 call->ping_at = j; 208 call->expect_rx_by = j; 209 call->expect_req_by = j; 210 call->expect_term_by = j; 211 call->timer.expires = now; 212 } 213 214 /* 215 * Set up a call for the given parameters. 216 * - Called with the socket lock held, which it must release. 217 * - If it returns a call, the call's lock will need releasing by the caller. 218 */ 219 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 220 struct rxrpc_conn_parameters *cp, 221 struct sockaddr_rxrpc *srx, 222 struct rxrpc_call_params *p, 223 gfp_t gfp, 224 unsigned int debug_id) 225 __releases(&rx->sk.sk_lock.slock) 226 __acquires(&call->user_mutex) 227 { 228 struct rxrpc_call *call, *xcall; 229 struct rxrpc_net *rxnet; 230 struct rb_node *parent, **pp; 231 const void *here = __builtin_return_address(0); 232 int ret; 233 234 _enter("%p,%lx", rx, p->user_call_ID); 235 236 call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); 237 if (IS_ERR(call)) { 238 release_sock(&rx->sk); 239 _leave(" = %ld", PTR_ERR(call)); 240 return call; 241 } 242 243 call->tx_total_len = p->tx_total_len; 244 trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 245 here, (const void *)p->user_call_ID); 246 247 /* We need to protect a partially set up call against the user as we 248 * will be acting outside the socket lock. 249 */ 250 mutex_lock(&call->user_mutex); 251 252 /* Publish the call, even though it is incompletely set up as yet */ 253 write_lock(&rx->call_lock); 254 255 pp = &rx->calls.rb_node; 256 parent = NULL; 257 while (*pp) { 258 parent = *pp; 259 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 260 261 if (p->user_call_ID < xcall->user_call_ID) 262 pp = &(*pp)->rb_left; 263 else if (p->user_call_ID > xcall->user_call_ID) 264 pp = &(*pp)->rb_right; 265 else 266 goto error_dup_user_ID; 267 } 268 269 rcu_assign_pointer(call->socket, rx); 270 call->user_call_ID = p->user_call_ID; 271 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 272 rxrpc_get_call(call, rxrpc_call_got_userid); 273 rb_link_node(&call->sock_node, parent, pp); 274 rb_insert_color(&call->sock_node, &rx->calls); 275 list_add(&call->sock_link, &rx->sock_calls); 276 277 write_unlock(&rx->call_lock); 278 279 rxnet = call->rxnet; 280 write_lock(&rxnet->call_lock); 281 list_add_tail(&call->link, &rxnet->calls); 282 write_unlock(&rxnet->call_lock); 283 284 /* From this point on, the call is protected by its own lock. */ 285 release_sock(&rx->sk); 286 287 /* Set up or get a connection record and set the protocol parameters, 288 * including channel number and call ID. 289 */ 290 ret = rxrpc_connect_call(call, cp, srx, gfp); 291 if (ret < 0) 292 goto error; 293 294 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 295 here, NULL); 296 297 rxrpc_start_call_timer(call); 298 299 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 300 301 _leave(" = %p [new]", call); 302 return call; 303 304 /* We unexpectedly found the user ID in the list after taking 305 * the call_lock. This shouldn't happen unless the user races 306 * with itself and tries to add the same user ID twice at the 307 * same time in different threads. 308 */ 309 error_dup_user_ID: 310 write_unlock(&rx->call_lock); 311 release_sock(&rx->sk); 312 ret = -EEXIST; 313 314 error: 315 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 316 RX_CALL_DEAD, ret); 317 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 318 here, ERR_PTR(ret)); 319 rxrpc_release_call(rx, call); 320 mutex_unlock(&call->user_mutex); 321 rxrpc_put_call(call, rxrpc_call_put); 322 _leave(" = %d", ret); 323 return ERR_PTR(ret); 324 } 325 326 /* 327 * Retry a call to a new address. It is expected that the Tx queue of the call 328 * will contain data previously packaged for an old call. 329 */ 330 int rxrpc_retry_client_call(struct rxrpc_sock *rx, 331 struct rxrpc_call *call, 332 struct rxrpc_conn_parameters *cp, 333 struct sockaddr_rxrpc *srx, 334 gfp_t gfp) 335 { 336 const void *here = __builtin_return_address(0); 337 int ret; 338 339 /* Set up or get a connection record and set the protocol parameters, 340 * including channel number and call ID. 341 */ 342 ret = rxrpc_connect_call(call, cp, srx, gfp); 343 if (ret < 0) 344 goto error; 345 346 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 347 here, NULL); 348 349 rxrpc_start_call_timer(call); 350 351 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 352 353 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) 354 rxrpc_queue_call(call); 355 356 _leave(" = 0"); 357 return 0; 358 359 error: 360 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 361 RX_CALL_DEAD, ret); 362 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 363 here, ERR_PTR(ret)); 364 _leave(" = %d", ret); 365 return ret; 366 } 367 368 /* 369 * Set up an incoming call. call->conn points to the connection. 370 * This is called in BH context and isn't allowed to fail. 371 */ 372 void rxrpc_incoming_call(struct rxrpc_sock *rx, 373 struct rxrpc_call *call, 374 struct sk_buff *skb) 375 { 376 struct rxrpc_connection *conn = call->conn; 377 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 378 u32 chan; 379 380 _enter(",%d", call->conn->debug_id); 381 382 rcu_assign_pointer(call->socket, rx); 383 call->call_id = sp->hdr.callNumber; 384 call->service_id = sp->hdr.serviceId; 385 call->cid = sp->hdr.cid; 386 call->state = RXRPC_CALL_SERVER_ACCEPTING; 387 if (sp->hdr.securityIndex > 0) 388 call->state = RXRPC_CALL_SERVER_SECURING; 389 call->cong_tstamp = skb->tstamp; 390 391 /* Set the channel for this call. We don't get channel_lock as we're 392 * only defending against the data_ready handler (which we're called 393 * from) and the RESPONSE packet parser (which is only really 394 * interested in call_counter and can cope with a disagreement with the 395 * call pointer). 396 */ 397 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 398 conn->channels[chan].call_counter = call->call_id; 399 conn->channels[chan].call_id = call->call_id; 400 rcu_assign_pointer(conn->channels[chan].call, call); 401 402 spin_lock(&conn->params.peer->lock); 403 hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 404 spin_unlock(&conn->params.peer->lock); 405 406 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 407 408 rxrpc_start_call_timer(call); 409 _leave(""); 410 } 411 412 /* 413 * Queue a call's work processor, getting a ref to pass to the work queue. 414 */ 415 bool rxrpc_queue_call(struct rxrpc_call *call) 416 { 417 const void *here = __builtin_return_address(0); 418 int n = __atomic_add_unless(&call->usage, 1, 0); 419 if (n == 0) 420 return false; 421 if (rxrpc_queue_work(&call->processor)) 422 trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 423 else 424 rxrpc_put_call(call, rxrpc_call_put_noqueue); 425 return true; 426 } 427 428 /* 429 * Queue a call's work processor, passing the callers ref to the work queue. 430 */ 431 bool __rxrpc_queue_call(struct rxrpc_call *call) 432 { 433 const void *here = __builtin_return_address(0); 434 int n = atomic_read(&call->usage); 435 ASSERTCMP(n, >=, 1); 436 if (rxrpc_queue_work(&call->processor)) 437 trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 438 else 439 rxrpc_put_call(call, rxrpc_call_put_noqueue); 440 return true; 441 } 442 443 /* 444 * Note the re-emergence of a call. 445 */ 446 void rxrpc_see_call(struct rxrpc_call *call) 447 { 448 const void *here = __builtin_return_address(0); 449 if (call) { 450 int n = atomic_read(&call->usage); 451 452 trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 453 } 454 } 455 456 /* 457 * Note the addition of a ref on a call. 458 */ 459 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 460 { 461 const void *here = __builtin_return_address(0); 462 int n = atomic_inc_return(&call->usage); 463 464 trace_rxrpc_call(call, op, n, here, NULL); 465 } 466 467 /* 468 * Detach a call from its owning socket. 469 */ 470 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 471 { 472 const void *here = __builtin_return_address(0); 473 struct rxrpc_connection *conn = call->conn; 474 bool put = false; 475 int i; 476 477 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 478 479 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 480 here, (const void *)call->flags); 481 482 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 483 484 spin_lock_bh(&call->lock); 485 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 486 BUG(); 487 spin_unlock_bh(&call->lock); 488 489 del_timer_sync(&call->timer); 490 491 /* Make sure we don't get any more notifications */ 492 write_lock_bh(&rx->recvmsg_lock); 493 494 if (!list_empty(&call->recvmsg_link)) { 495 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 496 call, call->events, call->flags); 497 list_del(&call->recvmsg_link); 498 put = true; 499 } 500 501 /* list_empty() must return false in rxrpc_notify_socket() */ 502 call->recvmsg_link.next = NULL; 503 call->recvmsg_link.prev = NULL; 504 505 write_unlock_bh(&rx->recvmsg_lock); 506 if (put) 507 rxrpc_put_call(call, rxrpc_call_put); 508 509 write_lock(&rx->call_lock); 510 511 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 512 rb_erase(&call->sock_node, &rx->calls); 513 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 514 rxrpc_put_call(call, rxrpc_call_put_userid); 515 } 516 517 list_del(&call->sock_link); 518 write_unlock(&rx->call_lock); 519 520 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 521 522 if (conn) 523 rxrpc_disconnect_call(call); 524 525 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 526 rxrpc_free_skb(call->rxtx_buffer[i], 527 (call->tx_phase ? rxrpc_skb_tx_cleaned : 528 rxrpc_skb_rx_cleaned)); 529 call->rxtx_buffer[i] = NULL; 530 } 531 532 _leave(""); 533 } 534 535 /* 536 * Prepare a kernel service call for retry. 537 */ 538 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call) 539 { 540 const void *here = __builtin_return_address(0); 541 int i; 542 u8 last = 0; 543 544 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 545 546 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 547 here, (const void *)call->flags); 548 549 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 550 ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED); 551 ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED); 552 ASSERT(list_empty(&call->recvmsg_link)); 553 554 del_timer_sync(&call->timer); 555 556 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn); 557 558 if (call->conn) 559 rxrpc_disconnect_call(call); 560 561 if (rxrpc_is_service_call(call) || 562 !call->tx_phase || 563 call->tx_hard_ack != 0 || 564 call->rx_hard_ack != 0 || 565 call->rx_top != 0) 566 return -EINVAL; 567 568 call->state = RXRPC_CALL_UNINITIALISED; 569 call->completion = RXRPC_CALL_SUCCEEDED; 570 call->call_id = 0; 571 call->cid = 0; 572 call->cong_cwnd = 0; 573 call->cong_extra = 0; 574 call->cong_ssthresh = 0; 575 call->cong_mode = 0; 576 call->cong_dup_acks = 0; 577 call->cong_cumul_acks = 0; 578 call->acks_lowest_nak = 0; 579 580 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 581 last |= call->rxtx_annotations[i]; 582 call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST; 583 call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS; 584 } 585 586 _leave(" = 0"); 587 return 0; 588 } 589 590 /* 591 * release all the calls associated with a socket 592 */ 593 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 594 { 595 struct rxrpc_call *call; 596 597 _enter("%p", rx); 598 599 while (!list_empty(&rx->to_be_accepted)) { 600 call = list_entry(rx->to_be_accepted.next, 601 struct rxrpc_call, accept_link); 602 list_del(&call->accept_link); 603 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 604 rxrpc_put_call(call, rxrpc_call_put); 605 } 606 607 while (!list_empty(&rx->sock_calls)) { 608 call = list_entry(rx->sock_calls.next, 609 struct rxrpc_call, sock_link); 610 rxrpc_get_call(call, rxrpc_call_got); 611 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 612 rxrpc_send_abort_packet(call); 613 rxrpc_release_call(rx, call); 614 rxrpc_put_call(call, rxrpc_call_put); 615 } 616 617 _leave(""); 618 } 619 620 /* 621 * release a call 622 */ 623 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 624 { 625 struct rxrpc_net *rxnet = call->rxnet; 626 const void *here = __builtin_return_address(0); 627 int n; 628 629 ASSERT(call != NULL); 630 631 n = atomic_dec_return(&call->usage); 632 trace_rxrpc_call(call, op, n, here, NULL); 633 ASSERTCMP(n, >=, 0); 634 if (n == 0) { 635 _debug("call %d dead", call->debug_id); 636 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 637 638 if (!list_empty(&call->link)) { 639 write_lock(&rxnet->call_lock); 640 list_del_init(&call->link); 641 write_unlock(&rxnet->call_lock); 642 } 643 644 rxrpc_cleanup_call(call); 645 } 646 } 647 648 /* 649 * Final call destruction under RCU. 650 */ 651 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 652 { 653 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 654 struct rxrpc_net *rxnet = call->rxnet; 655 656 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 * clean up a call 666 */ 667 void rxrpc_cleanup_call(struct rxrpc_call *call) 668 { 669 int i; 670 671 _net("DESTROY CALL %d", call->debug_id); 672 673 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 674 675 del_timer_sync(&call->timer); 676 677 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 678 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 679 ASSERTCMP(call->conn, ==, NULL); 680 681 /* Clean up the Rx/Tx buffer */ 682 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 683 rxrpc_free_skb(call->rxtx_buffer[i], 684 (call->tx_phase ? rxrpc_skb_tx_cleaned : 685 rxrpc_skb_rx_cleaned)); 686 687 rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 688 689 call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 690 } 691 692 /* 693 * Make sure that all calls are gone from a network namespace. To reach this 694 * point, any open UDP sockets in that namespace must have been closed, so any 695 * outstanding calls cannot be doing I/O. 696 */ 697 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 698 { 699 struct rxrpc_call *call; 700 701 _enter(""); 702 703 if (list_empty(&rxnet->calls)) 704 return; 705 706 write_lock(&rxnet->call_lock); 707 708 while (!list_empty(&rxnet->calls)) { 709 call = list_entry(rxnet->calls.next, struct rxrpc_call, link); 710 _debug("Zapping call %p", call); 711 712 rxrpc_see_call(call); 713 list_del_init(&call->link); 714 715 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 716 call, atomic_read(&call->usage), 717 rxrpc_call_states[call->state], 718 call->flags, call->events); 719 720 write_unlock(&rxnet->call_lock); 721 cond_resched(); 722 write_lock(&rxnet->call_lock); 723 } 724 725 write_unlock(&rxnet->call_lock); 726 727 atomic_dec(&rxnet->nr_calls); 728 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); 729 } 730