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