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(unsigned long _call) 49 { 50 struct rxrpc_call *call = (struct rxrpc_call *)_call; 51 52 _enter("%d", call->debug_id); 53 54 if (call->state < RXRPC_CALL_COMPLETE) 55 rxrpc_set_timer(call, rxrpc_timer_expired, ktime_get_real()); 56 } 57 58 /* 59 * find an extant server call 60 * - called in process context with IRQs enabled 61 */ 62 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, 63 unsigned long user_call_ID) 64 { 65 struct rxrpc_call *call; 66 struct rb_node *p; 67 68 _enter("%p,%lx", rx, user_call_ID); 69 70 read_lock(&rx->call_lock); 71 72 p = rx->calls.rb_node; 73 while (p) { 74 call = rb_entry(p, struct rxrpc_call, sock_node); 75 76 if (user_call_ID < call->user_call_ID) 77 p = p->rb_left; 78 else if (user_call_ID > call->user_call_ID) 79 p = p->rb_right; 80 else 81 goto found_extant_call; 82 } 83 84 read_unlock(&rx->call_lock); 85 _leave(" = NULL"); 86 return NULL; 87 88 found_extant_call: 89 rxrpc_get_call(call, rxrpc_call_got); 90 read_unlock(&rx->call_lock); 91 _leave(" = %p [%d]", call, atomic_read(&call->usage)); 92 return call; 93 } 94 95 /* 96 * allocate a new call 97 */ 98 struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) 99 { 100 struct rxrpc_call *call; 101 102 call = kmem_cache_zalloc(rxrpc_call_jar, gfp); 103 if (!call) 104 return NULL; 105 106 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, 107 sizeof(struct sk_buff *), 108 gfp); 109 if (!call->rxtx_buffer) 110 goto nomem; 111 112 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); 113 if (!call->rxtx_annotations) 114 goto nomem_2; 115 116 mutex_init(&call->user_mutex); 117 setup_timer(&call->timer, rxrpc_call_timer_expired, 118 (unsigned long)call); 119 INIT_WORK(&call->processor, &rxrpc_process_call); 120 INIT_LIST_HEAD(&call->link); 121 INIT_LIST_HEAD(&call->chan_wait_link); 122 INIT_LIST_HEAD(&call->accept_link); 123 INIT_LIST_HEAD(&call->recvmsg_link); 124 INIT_LIST_HEAD(&call->sock_link); 125 init_waitqueue_head(&call->waitq); 126 spin_lock_init(&call->lock); 127 spin_lock_init(&call->notify_lock); 128 rwlock_init(&call->state_lock); 129 atomic_set(&call->usage, 1); 130 call->debug_id = atomic_inc_return(&rxrpc_debug_id); 131 call->tx_total_len = -1; 132 133 memset(&call->sock_node, 0xed, sizeof(call->sock_node)); 134 135 /* Leave space in the ring to handle a maxed-out jumbo packet */ 136 call->rx_winsize = rxrpc_rx_window_size; 137 call->tx_winsize = 16; 138 call->rx_expect_next = 1; 139 140 call->cong_cwnd = 2; 141 call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; 142 return call; 143 144 nomem_2: 145 kfree(call->rxtx_buffer); 146 nomem: 147 kmem_cache_free(rxrpc_call_jar, call); 148 return NULL; 149 } 150 151 /* 152 * Allocate a new client call. 153 */ 154 static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx, 155 gfp_t gfp) 156 { 157 struct rxrpc_call *call; 158 ktime_t now; 159 160 _enter(""); 161 162 call = rxrpc_alloc_call(gfp); 163 if (!call) 164 return ERR_PTR(-ENOMEM); 165 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; 166 call->service_id = srx->srx_service; 167 call->tx_phase = true; 168 now = ktime_get_real(); 169 call->acks_latest_ts = now; 170 call->cong_tstamp = now; 171 172 _leave(" = %p", call); 173 return call; 174 } 175 176 /* 177 * Initiate the call ack/resend/expiry timer. 178 */ 179 static void rxrpc_start_call_timer(struct rxrpc_call *call) 180 { 181 ktime_t now = ktime_get_real(), expire_at; 182 183 expire_at = ktime_add_ms(now, rxrpc_max_call_lifetime); 184 call->expire_at = expire_at; 185 call->ack_at = expire_at; 186 call->ping_at = expire_at; 187 call->resend_at = expire_at; 188 call->timer.expires = jiffies + LONG_MAX / 2; 189 rxrpc_set_timer(call, rxrpc_timer_begin, now); 190 } 191 192 /* 193 * Set up a call for the given parameters. 194 * - Called with the socket lock held, which it must release. 195 * - If it returns a call, the call's lock will need releasing by the caller. 196 */ 197 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, 198 struct rxrpc_conn_parameters *cp, 199 struct sockaddr_rxrpc *srx, 200 unsigned long user_call_ID, 201 s64 tx_total_len, 202 gfp_t gfp) 203 __releases(&rx->sk.sk_lock.slock) 204 { 205 struct rxrpc_call *call, *xcall; 206 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); 207 struct rb_node *parent, **pp; 208 const void *here = __builtin_return_address(0); 209 int ret; 210 211 _enter("%p,%lx", rx, user_call_ID); 212 213 call = rxrpc_alloc_client_call(srx, gfp); 214 if (IS_ERR(call)) { 215 release_sock(&rx->sk); 216 _leave(" = %ld", PTR_ERR(call)); 217 return call; 218 } 219 220 call->tx_total_len = tx_total_len; 221 trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), 222 here, (const void *)user_call_ID); 223 224 /* We need to protect a partially set up call against the user as we 225 * will be acting outside the socket lock. 226 */ 227 mutex_lock(&call->user_mutex); 228 229 /* Publish the call, even though it is incompletely set up as yet */ 230 write_lock(&rx->call_lock); 231 232 pp = &rx->calls.rb_node; 233 parent = NULL; 234 while (*pp) { 235 parent = *pp; 236 xcall = rb_entry(parent, struct rxrpc_call, sock_node); 237 238 if (user_call_ID < xcall->user_call_ID) 239 pp = &(*pp)->rb_left; 240 else if (user_call_ID > xcall->user_call_ID) 241 pp = &(*pp)->rb_right; 242 else 243 goto error_dup_user_ID; 244 } 245 246 rcu_assign_pointer(call->socket, rx); 247 call->user_call_ID = user_call_ID; 248 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); 249 rxrpc_get_call(call, rxrpc_call_got_userid); 250 rb_link_node(&call->sock_node, parent, pp); 251 rb_insert_color(&call->sock_node, &rx->calls); 252 list_add(&call->sock_link, &rx->sock_calls); 253 254 write_unlock(&rx->call_lock); 255 256 write_lock(&rxnet->call_lock); 257 list_add_tail(&call->link, &rxnet->calls); 258 write_unlock(&rxnet->call_lock); 259 260 /* From this point on, the call is protected by its own lock. */ 261 release_sock(&rx->sk); 262 263 /* Set up or get a connection record and set the protocol parameters, 264 * including channel number and call ID. 265 */ 266 ret = rxrpc_connect_call(call, cp, srx, gfp); 267 if (ret < 0) 268 goto error; 269 270 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 271 here, NULL); 272 273 rxrpc_start_call_timer(call); 274 275 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 276 277 _leave(" = %p [new]", call); 278 return call; 279 280 /* We unexpectedly found the user ID in the list after taking 281 * the call_lock. This shouldn't happen unless the user races 282 * with itself and tries to add the same user ID twice at the 283 * same time in different threads. 284 */ 285 error_dup_user_ID: 286 write_unlock(&rx->call_lock); 287 release_sock(&rx->sk); 288 ret = -EEXIST; 289 290 error: 291 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 292 RX_CALL_DEAD, ret); 293 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 294 here, ERR_PTR(ret)); 295 rxrpc_release_call(rx, call); 296 mutex_unlock(&call->user_mutex); 297 rxrpc_put_call(call, rxrpc_call_put); 298 _leave(" = %d", ret); 299 return ERR_PTR(ret); 300 } 301 302 /* 303 * Retry a call to a new address. It is expected that the Tx queue of the call 304 * will contain data previously packaged for an old call. 305 */ 306 int rxrpc_retry_client_call(struct rxrpc_sock *rx, 307 struct rxrpc_call *call, 308 struct rxrpc_conn_parameters *cp, 309 struct sockaddr_rxrpc *srx, 310 gfp_t gfp) 311 { 312 const void *here = __builtin_return_address(0); 313 int ret; 314 315 /* Set up or get a connection record and set the protocol parameters, 316 * including channel number and call ID. 317 */ 318 ret = rxrpc_connect_call(call, cp, srx, gfp); 319 if (ret < 0) 320 goto error; 321 322 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), 323 here, NULL); 324 325 rxrpc_start_call_timer(call); 326 327 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); 328 329 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) 330 rxrpc_queue_call(call); 331 332 _leave(" = 0"); 333 return 0; 334 335 error: 336 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 337 RX_CALL_DEAD, ret); 338 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), 339 here, ERR_PTR(ret)); 340 _leave(" = %d", ret); 341 return ret; 342 } 343 344 /* 345 * Set up an incoming call. call->conn points to the connection. 346 * This is called in BH context and isn't allowed to fail. 347 */ 348 void rxrpc_incoming_call(struct rxrpc_sock *rx, 349 struct rxrpc_call *call, 350 struct sk_buff *skb) 351 { 352 struct rxrpc_connection *conn = call->conn; 353 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 354 u32 chan; 355 356 _enter(",%d", call->conn->debug_id); 357 358 rcu_assign_pointer(call->socket, rx); 359 call->call_id = sp->hdr.callNumber; 360 call->service_id = sp->hdr.serviceId; 361 call->cid = sp->hdr.cid; 362 call->state = RXRPC_CALL_SERVER_ACCEPTING; 363 if (sp->hdr.securityIndex > 0) 364 call->state = RXRPC_CALL_SERVER_SECURING; 365 call->cong_tstamp = skb->tstamp; 366 367 /* Set the channel for this call. We don't get channel_lock as we're 368 * only defending against the data_ready handler (which we're called 369 * from) and the RESPONSE packet parser (which is only really 370 * interested in call_counter and can cope with a disagreement with the 371 * call pointer). 372 */ 373 chan = sp->hdr.cid & RXRPC_CHANNELMASK; 374 conn->channels[chan].call_counter = call->call_id; 375 conn->channels[chan].call_id = call->call_id; 376 rcu_assign_pointer(conn->channels[chan].call, call); 377 378 spin_lock(&conn->params.peer->lock); 379 hlist_add_head(&call->error_link, &conn->params.peer->error_targets); 380 spin_unlock(&conn->params.peer->lock); 381 382 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); 383 384 rxrpc_start_call_timer(call); 385 _leave(""); 386 } 387 388 /* 389 * Queue a call's work processor, getting a ref to pass to the work queue. 390 */ 391 bool rxrpc_queue_call(struct rxrpc_call *call) 392 { 393 const void *here = __builtin_return_address(0); 394 int n = __atomic_add_unless(&call->usage, 1, 0); 395 if (n == 0) 396 return false; 397 if (rxrpc_queue_work(&call->processor)) 398 trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); 399 else 400 rxrpc_put_call(call, rxrpc_call_put_noqueue); 401 return true; 402 } 403 404 /* 405 * Queue a call's work processor, passing the callers ref to the work queue. 406 */ 407 bool __rxrpc_queue_call(struct rxrpc_call *call) 408 { 409 const void *here = __builtin_return_address(0); 410 int n = atomic_read(&call->usage); 411 ASSERTCMP(n, >=, 1); 412 if (rxrpc_queue_work(&call->processor)) 413 trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); 414 else 415 rxrpc_put_call(call, rxrpc_call_put_noqueue); 416 return true; 417 } 418 419 /* 420 * Note the re-emergence of a call. 421 */ 422 void rxrpc_see_call(struct rxrpc_call *call) 423 { 424 const void *here = __builtin_return_address(0); 425 if (call) { 426 int n = atomic_read(&call->usage); 427 428 trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); 429 } 430 } 431 432 /* 433 * Note the addition of a ref on a call. 434 */ 435 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 436 { 437 const void *here = __builtin_return_address(0); 438 int n = atomic_inc_return(&call->usage); 439 440 trace_rxrpc_call(call, op, n, here, NULL); 441 } 442 443 /* 444 * Detach a call from its owning socket. 445 */ 446 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) 447 { 448 const void *here = __builtin_return_address(0); 449 struct rxrpc_connection *conn = call->conn; 450 bool put = false; 451 int i; 452 453 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 454 455 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 456 here, (const void *)call->flags); 457 458 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 459 460 spin_lock_bh(&call->lock); 461 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) 462 BUG(); 463 spin_unlock_bh(&call->lock); 464 465 del_timer_sync(&call->timer); 466 467 /* Make sure we don't get any more notifications */ 468 write_lock_bh(&rx->recvmsg_lock); 469 470 if (!list_empty(&call->recvmsg_link)) { 471 _debug("unlinking once-pending call %p { e=%lx f=%lx }", 472 call, call->events, call->flags); 473 list_del(&call->recvmsg_link); 474 put = true; 475 } 476 477 /* list_empty() must return false in rxrpc_notify_socket() */ 478 call->recvmsg_link.next = NULL; 479 call->recvmsg_link.prev = NULL; 480 481 write_unlock_bh(&rx->recvmsg_lock); 482 if (put) 483 rxrpc_put_call(call, rxrpc_call_put); 484 485 write_lock(&rx->call_lock); 486 487 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { 488 rb_erase(&call->sock_node, &rx->calls); 489 memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); 490 rxrpc_put_call(call, rxrpc_call_put_userid); 491 } 492 493 list_del(&call->sock_link); 494 write_unlock(&rx->call_lock); 495 496 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); 497 498 if (conn) 499 rxrpc_disconnect_call(call); 500 501 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 502 rxrpc_free_skb(call->rxtx_buffer[i], 503 (call->tx_phase ? rxrpc_skb_tx_cleaned : 504 rxrpc_skb_rx_cleaned)); 505 call->rxtx_buffer[i] = NULL; 506 } 507 508 _leave(""); 509 } 510 511 /* 512 * Prepare a kernel service call for retry. 513 */ 514 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call) 515 { 516 const void *here = __builtin_return_address(0); 517 int i; 518 u8 last = 0; 519 520 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); 521 522 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), 523 here, (const void *)call->flags); 524 525 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 526 ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED); 527 ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED); 528 ASSERT(list_empty(&call->recvmsg_link)); 529 530 del_timer_sync(&call->timer); 531 532 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn); 533 534 if (call->conn) 535 rxrpc_disconnect_call(call); 536 537 if (rxrpc_is_service_call(call) || 538 !call->tx_phase || 539 call->tx_hard_ack != 0 || 540 call->rx_hard_ack != 0 || 541 call->rx_top != 0) 542 return -EINVAL; 543 544 call->state = RXRPC_CALL_UNINITIALISED; 545 call->completion = RXRPC_CALL_SUCCEEDED; 546 call->call_id = 0; 547 call->cid = 0; 548 call->cong_cwnd = 0; 549 call->cong_extra = 0; 550 call->cong_ssthresh = 0; 551 call->cong_mode = 0; 552 call->cong_dup_acks = 0; 553 call->cong_cumul_acks = 0; 554 call->acks_lowest_nak = 0; 555 556 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { 557 last |= call->rxtx_annotations[i]; 558 call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST; 559 call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS; 560 } 561 562 _leave(" = 0"); 563 return 0; 564 } 565 566 /* 567 * release all the calls associated with a socket 568 */ 569 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) 570 { 571 struct rxrpc_call *call; 572 573 _enter("%p", rx); 574 575 while (!list_empty(&rx->to_be_accepted)) { 576 call = list_entry(rx->to_be_accepted.next, 577 struct rxrpc_call, accept_link); 578 list_del(&call->accept_link); 579 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); 580 rxrpc_put_call(call, rxrpc_call_put); 581 } 582 583 while (!list_empty(&rx->sock_calls)) { 584 call = list_entry(rx->sock_calls.next, 585 struct rxrpc_call, sock_link); 586 rxrpc_get_call(call, rxrpc_call_got); 587 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); 588 rxrpc_send_abort_packet(call); 589 rxrpc_release_call(rx, call); 590 rxrpc_put_call(call, rxrpc_call_put); 591 } 592 593 _leave(""); 594 } 595 596 /* 597 * release a call 598 */ 599 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) 600 { 601 struct rxrpc_net *rxnet; 602 const void *here = __builtin_return_address(0); 603 int n; 604 605 ASSERT(call != NULL); 606 607 n = atomic_dec_return(&call->usage); 608 trace_rxrpc_call(call, op, n, here, NULL); 609 ASSERTCMP(n, >=, 0); 610 if (n == 0) { 611 _debug("call %d dead", call->debug_id); 612 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 613 614 if (!list_empty(&call->link)) { 615 rxnet = rxrpc_net(sock_net(&call->socket->sk)); 616 write_lock(&rxnet->call_lock); 617 list_del_init(&call->link); 618 write_unlock(&rxnet->call_lock); 619 } 620 621 rxrpc_cleanup_call(call); 622 } 623 } 624 625 /* 626 * Final call destruction under RCU. 627 */ 628 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) 629 { 630 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); 631 632 rxrpc_put_peer(call->peer); 633 kfree(call->rxtx_buffer); 634 kfree(call->rxtx_annotations); 635 kmem_cache_free(rxrpc_call_jar, call); 636 } 637 638 /* 639 * clean up a call 640 */ 641 void rxrpc_cleanup_call(struct rxrpc_call *call) 642 { 643 int i; 644 645 _net("DESTROY CALL %d", call->debug_id); 646 647 memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); 648 649 del_timer_sync(&call->timer); 650 651 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); 652 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); 653 ASSERTCMP(call->conn, ==, NULL); 654 655 /* Clean up the Rx/Tx buffer */ 656 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) 657 rxrpc_free_skb(call->rxtx_buffer[i], 658 (call->tx_phase ? rxrpc_skb_tx_cleaned : 659 rxrpc_skb_rx_cleaned)); 660 661 rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); 662 663 call_rcu(&call->rcu, rxrpc_rcu_destroy_call); 664 } 665 666 /* 667 * Make sure that all calls are gone from a network namespace. To reach this 668 * point, any open UDP sockets in that namespace must have been closed, so any 669 * outstanding calls cannot be doing I/O. 670 */ 671 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) 672 { 673 struct rxrpc_call *call; 674 675 _enter(""); 676 677 if (list_empty(&rxnet->calls)) 678 return; 679 680 write_lock(&rxnet->call_lock); 681 682 while (!list_empty(&rxnet->calls)) { 683 call = list_entry(rxnet->calls.next, struct rxrpc_call, link); 684 _debug("Zapping call %p", call); 685 686 rxrpc_see_call(call); 687 list_del_init(&call->link); 688 689 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", 690 call, atomic_read(&call->usage), 691 rxrpc_call_states[call->state], 692 call->flags, call->events); 693 694 write_unlock(&rxnet->call_lock); 695 cond_resched(); 696 write_lock(&rxnet->call_lock); 697 } 698 699 write_unlock(&rxnet->call_lock); 700 } 701