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 { 104 struct rxrpc_call *call; 105 106 call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 107 if (!call) 108 return NULL; 109 110 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 111 sizeof(struct sk_buff *), 112 gfp); 113 if (!call->rxtx_buffer) 114 goto nomem; 115 116 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 117 if (!call->rxtx_annotations) 118 goto nomem_2; 119 120 mutex_init(&call->user_mutex); 121 122 /* Prevent lockdep reporting a deadlock false positive between the afs 123 * filesystem and sys_sendmsg() via the mmap sem. 124 */ 125 if (rx->sk.sk_kern_sock) 126 lockdep_set_class(&call->user_mutex, 127 &rxrpc_call_user_mutex_lock_class_key); 128 129 timer_setup(&call->timer, rxrpc_call_timer_expired, 0); 130 INIT_WORK(&call->processor, &rxrpc_process_call); 131 INIT_LIST_HEAD(&call->link); 132 INIT_LIST_HEAD(&call->chan_wait_link); 133 INIT_LIST_HEAD(&call->accept_link); 134 INIT_LIST_HEAD(&call->recvmsg_link); 135 INIT_LIST_HEAD(&call->sock_link); 136 init_waitqueue_head(&call->waitq); 137 spin_lock_init(&call->lock); 138 spin_lock_init(&call->notify_lock); 139 rwlock_init(&call->state_lock); 140 atomic_set(&call->usage, 1); 141 call->debug_id = atomic_inc_return(&rxrpc_debug_id); 142 call->tx_total_len = -1; 143 call->next_rx_timo = 20 * HZ; 144 call->next_req_timo = 1 * HZ; 145 146 memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 147 148 /* Leave space in the ring to handle a maxed-out jumbo packet */ 149 call->rx_winsize = rxrpc_rx_window_size; 150 call->tx_winsize = 16; 151 call->rx_expect_next = 1; 152 153 call->cong_cwnd = 2; 154 call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 155 return call; 156 157 nomem_2: 158 kfree(call->rxtx_buffer); 159 nomem: 160 kmem_cache_free(rxrpc_call_jar, call); 161 return NULL; 162 } 163 164 /* 165 * Allocate a new client call. 166 */ 167 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, 168 struct sockaddr_rxrpc *srx, 169 gfp_t gfp) 170 { 171 struct rxrpc_call *call; 172 ktime_t now; 173 174 _enter(""); 175 176 call = rxrpc_alloc_call(rx, gfp); 177 if (!call) 178 return ERR_PTR(-ENOMEM); 179 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 180 call->service_id = srx->srx_service; 181 call->tx_phase = true; 182 now = ktime_get_real(); 183 call->acks_latest_ts = now; 184 call->cong_tstamp = now; 185 186 _leave(" = %p", call); 187 return call; 188 } 189 190 /* 191 * Initiate the call ack/resend/expiry timer. 192 */ 193 static void rxrpc_start_call_timer(struct rxrpc_call *call) 194 { 195 unsigned long now = jiffies; 196 unsigned long j = now + MAX_JIFFY_OFFSET; 197 198 call->ack_at = j; 199 call->ack_lost_at = j; 200 call->resend_at = j; 201 call->ping_at = j; 202 call->expect_rx_by = j; 203 call->expect_req_by = j; 204 call->expect_term_by = j; 205 call->timer.expires = now; 206 } 207 208 /* 209 * Set up a call for the given parameters. 210 * - Called with the socket lock held, which it must release. 211 * - If it returns a call, the call's lock will need releasing by the caller. 212 */ 213 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 214 struct rxrpc_conn_parameters *cp, 215 struct sockaddr_rxrpc *srx, 216 struct rxrpc_call_params *p, 217 gfp_t gfp) 218 __releases(&rx->sk.sk_lock.slock) 219 { 220 struct rxrpc_call *call, *xcall; 221 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 222 struct rb_node *parent, **pp; 223 const void *here = __builtin_return_address(0); 224 int ret; 225 226 _enter("%p,%lx", rx, p->user_call_ID); 227 228 call = rxrpc_alloc_client_call(rx, srx, gfp); 229 if (IS_ERR(call)) { 230 release_sock(&rx->sk); 231 _leave(" = %ld", PTR_ERR(call)); 232 return call; 233 } 234 235 call->tx_total_len = p->tx_total_len; 236 trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 237 here, (const void *)p->user_call_ID); 238 239 /* We need to protect a partially set up call against the user as we 240 * will be acting outside the socket lock. 241 */ 242 mutex_lock(&call->user_mutex); 243 244 /* Publish the call, even though it is incompletely set up as yet */ 245 write_lock(&rx->call_lock); 246 247 pp = &rx->calls.rb_node; 248 parent = NULL; 249 while (*pp) { 250 parent = *pp; 251 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 252 253 if (p->user_call_ID < xcall->user_call_ID) 254 pp = &(*pp)->rb_left; 255 else if (p->user_call_ID > xcall->user_call_ID) 256 pp = &(*pp)->rb_right; 257 else 258 goto error_dup_user_ID; 259 } 260 261 rcu_assign_pointer(call->socket, rx); 262 call->user_call_ID = p->user_call_ID; 263 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 264 rxrpc_get_call(call, rxrpc_call_got_userid); 265 rb_link_node(&call->sock_node, parent, pp); 266 rb_insert_color(&call->sock_node, &rx->calls); 267 list_add(&call->sock_link, &rx->sock_calls); 268 269 write_unlock(&rx->call_lock); 270 271 write_lock(&rxnet->call_lock); 272 list_add_tail(&call->link, &rxnet->calls); 273 write_unlock(&rxnet->call_lock); 274 275 /* From this point on, the call is protected by its own lock. */ 276 release_sock(&rx->sk); 277 278 /* Set up or get a connection record and set the protocol parameters, 279 * including channel number and call ID. 280 */ 281 ret = rxrpc_connect_call(call, cp, srx, gfp); 282 if (ret < 0) 283 goto error; 284 285 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 286 here, NULL); 287 288 rxrpc_start_call_timer(call); 289 290 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 291 292 _leave(" = %p [new]", call); 293 return call; 294 295 /* We unexpectedly found the user ID in the list after taking 296 * the call_lock. This shouldn't happen unless the user races 297 * with itself and tries to add the same user ID twice at the 298 * same time in different threads. 299 */ 300 error_dup_user_ID: 301 write_unlock(&rx->call_lock); 302 release_sock(&rx->sk); 303 ret = -EEXIST; 304 305 error: 306 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 307 RX_CALL_DEAD, ret); 308 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 309 here, ERR_PTR(ret)); 310 rxrpc_release_call(rx, call); 311 mutex_unlock(&call->user_mutex); 312 rxrpc_put_call(call, rxrpc_call_put); 313 _leave(" = %d", ret); 314 return ERR_PTR(ret); 315 } 316 317 /* 318 * Retry a call to a new address. It is expected that the Tx queue of the call 319 * will contain data previously packaged for an old call. 320 */ 321 int rxrpc_retry_client_call(struct rxrpc_sock *rx, 322 struct rxrpc_call *call, 323 struct rxrpc_conn_parameters *cp, 324 struct sockaddr_rxrpc *srx, 325 gfp_t gfp) 326 { 327 const void *here = __builtin_return_address(0); 328 int ret; 329 330 /* Set up or get a connection record and set the protocol parameters, 331 * including channel number and call ID. 332 */ 333 ret = rxrpc_connect_call(call, cp, srx, gfp); 334 if (ret < 0) 335 goto error; 336 337 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 338 here, NULL); 339 340 rxrpc_start_call_timer(call); 341 342 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 343 344 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) 345 rxrpc_queue_call(call); 346 347 _leave(" = 0"); 348 return 0; 349 350 error: 351 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 352 RX_CALL_DEAD, ret); 353 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 354 here, ERR_PTR(ret)); 355 _leave(" = %d", ret); 356 return ret; 357 } 358 359 /* 360 * Set up an incoming call. call->conn points to the connection. 361 * This is called in BH context and isn't allowed to fail. 362 */ 363 void rxrpc_incoming_call(struct rxrpc_sock *rx, 364 struct rxrpc_call *call, 365 struct sk_buff *skb) 366 { 367 struct rxrpc_connection *conn = call->conn; 368 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 369 u32 chan; 370 371 _enter(",%d", call->conn->debug_id); 372 373 rcu_assign_pointer(call->socket, rx); 374 call->call_id = sp->hdr.callNumber; 375 call->service_id = sp->hdr.serviceId; 376 call->cid = sp->hdr.cid; 377 call->state = RXRPC_CALL_SERVER_ACCEPTING; 378 if (sp->hdr.securityIndex > 0) 379 call->state = RXRPC_CALL_SERVER_SECURING; 380 call->cong_tstamp = skb->tstamp; 381 382 /* Set the channel for this call. We don't get channel_lock as we're 383 * only defending against the data_ready handler (which we're called 384 * from) and the RESPONSE packet parser (which is only really 385 * interested in call_counter and can cope with a disagreement with the 386 * call pointer). 387 */ 388 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 389 conn->channels[chan].call_counter = call->call_id; 390 conn->channels[chan].call_id = call->call_id; 391 rcu_assign_pointer(conn->channels[chan].call, call); 392 393 spin_lock(&conn->params.peer->lock); 394 hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 395 spin_unlock(&conn->params.peer->lock); 396 397 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 398 399 rxrpc_start_call_timer(call); 400 _leave(""); 401 } 402 403 /* 404 * Queue a call's work processor, getting a ref to pass to the work queue. 405 */ 406 bool rxrpc_queue_call(struct rxrpc_call *call) 407 { 408 const void *here = __builtin_return_address(0); 409 int n = __atomic_add_unless(&call->usage, 1, 0); 410 if (n == 0) 411 return false; 412 if (rxrpc_queue_work(&call->processor)) 413 trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 414 else 415 rxrpc_put_call(call, rxrpc_call_put_noqueue); 416 return true; 417 } 418 419 /* 420 * Queue a call's work processor, passing the callers ref to the work queue. 421 */ 422 bool __rxrpc_queue_call(struct rxrpc_call *call) 423 { 424 const void *here = __builtin_return_address(0); 425 int n = atomic_read(&call->usage); 426 ASSERTCMP(n, >=, 1); 427 if (rxrpc_queue_work(&call->processor)) 428 trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 429 else 430 rxrpc_put_call(call, rxrpc_call_put_noqueue); 431 return true; 432 } 433 434 /* 435 * Note the re-emergence of a call. 436 */ 437 void rxrpc_see_call(struct rxrpc_call *call) 438 { 439 const void *here = __builtin_return_address(0); 440 if (call) { 441 int n = atomic_read(&call->usage); 442 443 trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 444 } 445 } 446 447 /* 448 * Note the addition of a ref on a call. 449 */ 450 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 451 { 452 const void *here = __builtin_return_address(0); 453 int n = atomic_inc_return(&call->usage); 454 455 trace_rxrpc_call(call, op, n, here, NULL); 456 } 457 458 /* 459 * Detach a call from its owning socket. 460 */ 461 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 462 { 463 const void *here = __builtin_return_address(0); 464 struct rxrpc_connection *conn = call->conn; 465 bool put = false; 466 int i; 467 468 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 469 470 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 471 here, (const void *)call->flags); 472 473 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 474 475 spin_lock_bh(&call->lock); 476 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 477 BUG(); 478 spin_unlock_bh(&call->lock); 479 480 del_timer_sync(&call->timer); 481 482 /* Make sure we don't get any more notifications */ 483 write_lock_bh(&rx->recvmsg_lock); 484 485 if (!list_empty(&call->recvmsg_link)) { 486 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 487 call, call->events, call->flags); 488 list_del(&call->recvmsg_link); 489 put = true; 490 } 491 492 /* list_empty() must return false in rxrpc_notify_socket() */ 493 call->recvmsg_link.next = NULL; 494 call->recvmsg_link.prev = NULL; 495 496 write_unlock_bh(&rx->recvmsg_lock); 497 if (put) 498 rxrpc_put_call(call, rxrpc_call_put); 499 500 write_lock(&rx->call_lock); 501 502 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 503 rb_erase(&call->sock_node, &rx->calls); 504 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 505 rxrpc_put_call(call, rxrpc_call_put_userid); 506 } 507 508 list_del(&call->sock_link); 509 write_unlock(&rx->call_lock); 510 511 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 512 513 if (conn) 514 rxrpc_disconnect_call(call); 515 516 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 517 rxrpc_free_skb(call->rxtx_buffer[i], 518 (call->tx_phase ? rxrpc_skb_tx_cleaned : 519 rxrpc_skb_rx_cleaned)); 520 call->rxtx_buffer[i] = NULL; 521 } 522 523 _leave(""); 524 } 525 526 /* 527 * Prepare a kernel service call for retry. 528 */ 529 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call) 530 { 531 const void *here = __builtin_return_address(0); 532 int i; 533 u8 last = 0; 534 535 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 536 537 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 538 here, (const void *)call->flags); 539 540 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 541 ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED); 542 ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED); 543 ASSERT(list_empty(&call->recvmsg_link)); 544 545 del_timer_sync(&call->timer); 546 547 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn); 548 549 if (call->conn) 550 rxrpc_disconnect_call(call); 551 552 if (rxrpc_is_service_call(call) || 553 !call->tx_phase || 554 call->tx_hard_ack != 0 || 555 call->rx_hard_ack != 0 || 556 call->rx_top != 0) 557 return -EINVAL; 558 559 call->state = RXRPC_CALL_UNINITIALISED; 560 call->completion = RXRPC_CALL_SUCCEEDED; 561 call->call_id = 0; 562 call->cid = 0; 563 call->cong_cwnd = 0; 564 call->cong_extra = 0; 565 call->cong_ssthresh = 0; 566 call->cong_mode = 0; 567 call->cong_dup_acks = 0; 568 call->cong_cumul_acks = 0; 569 call->acks_lowest_nak = 0; 570 571 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 572 last |= call->rxtx_annotations[i]; 573 call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST; 574 call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS; 575 } 576 577 _leave(" = 0"); 578 return 0; 579 } 580 581 /* 582 * release all the calls associated with a socket 583 */ 584 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 585 { 586 struct rxrpc_call *call; 587 588 _enter("%p", rx); 589 590 while (!list_empty(&rx->to_be_accepted)) { 591 call = list_entry(rx->to_be_accepted.next, 592 struct rxrpc_call, accept_link); 593 list_del(&call->accept_link); 594 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 595 rxrpc_put_call(call, rxrpc_call_put); 596 } 597 598 while (!list_empty(&rx->sock_calls)) { 599 call = list_entry(rx->sock_calls.next, 600 struct rxrpc_call, sock_link); 601 rxrpc_get_call(call, rxrpc_call_got); 602 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 603 rxrpc_send_abort_packet(call); 604 rxrpc_release_call(rx, call); 605 rxrpc_put_call(call, rxrpc_call_put); 606 } 607 608 _leave(""); 609 } 610 611 /* 612 * release a call 613 */ 614 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 615 { 616 struct rxrpc_net *rxnet; 617 const void *here = __builtin_return_address(0); 618 int n; 619 620 ASSERT(call != NULL); 621 622 n = atomic_dec_return(&call->usage); 623 trace_rxrpc_call(call, op, n, here, NULL); 624 ASSERTCMP(n, >=, 0); 625 if (n == 0) { 626 _debug("call %d dead", call->debug_id); 627 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 628 629 if (!list_empty(&call->link)) { 630 rxnet = rxrpc_net(sock_net(&call->socket->sk)); 631 write_lock(&rxnet->call_lock); 632 list_del_init(&call->link); 633 write_unlock(&rxnet->call_lock); 634 } 635 636 rxrpc_cleanup_call(call); 637 } 638 } 639 640 /* 641 * Final call destruction under RCU. 642 */ 643 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 644 { 645 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 646 647 rxrpc_put_peer(call->peer); 648 kfree(call->rxtx_buffer); 649 kfree(call->rxtx_annotations); 650 kmem_cache_free(rxrpc_call_jar, call); 651 } 652 653 /* 654 * clean up a call 655 */ 656 void rxrpc_cleanup_call(struct rxrpc_call *call) 657 { 658 int i; 659 660 _net("DESTROY CALL %d", call->debug_id); 661 662 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 663 664 del_timer_sync(&call->timer); 665 666 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 667 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 668 ASSERTCMP(call->conn, ==, NULL); 669 670 /* Clean up the Rx/Tx buffer */ 671 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 672 rxrpc_free_skb(call->rxtx_buffer[i], 673 (call->tx_phase ? rxrpc_skb_tx_cleaned : 674 rxrpc_skb_rx_cleaned)); 675 676 rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 677 678 call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 679 } 680 681 /* 682 * Make sure that all calls are gone from a network namespace. To reach this 683 * point, any open UDP sockets in that namespace must have been closed, so any 684 * outstanding calls cannot be doing I/O. 685 */ 686 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 687 { 688 struct rxrpc_call *call; 689 690 _enter(""); 691 692 if (list_empty(&rxnet->calls)) 693 return; 694 695 write_lock(&rxnet->call_lock); 696 697 while (!list_empty(&rxnet->calls)) { 698 call = list_entry(rxnet->calls.next, struct rxrpc_call, link); 699 _debug("Zapping call %p", call); 700 701 rxrpc_see_call(call); 702 list_del_init(&call->link); 703 704 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 705 call, atomic_read(&call->usage), 706 rxrpc_call_states[call->state], 707 call->flags, call->events); 708 709 write_unlock(&rxnet->call_lock); 710 cond_resched(); 711 write_lock(&rxnet->call_lock); 712 } 713 714 write_unlock(&rxnet->call_lock); 715 } 716