1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Maintain an RxRPC server socket to do AFS communications through 3 * 4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 #include <linux/slab.h> 9 #include <linux/sched/signal.h> 10 11 #include <net/sock.h> 12 #include <net/af_rxrpc.h> 13 #include "internal.h" 14 #include "afs_cm.h" 15 #include "protocol_yfs.h" 16 17 struct workqueue_struct *afs_async_calls; 18 19 static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long); 20 static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long); 21 static void afs_process_async_call(struct work_struct *); 22 static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long); 23 static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long); 24 static int afs_deliver_cm_op_id(struct afs_call *); 25 26 /* asynchronous incoming call initial processing */ 27 static const struct afs_call_type afs_RXCMxxxx = { 28 .name = "CB.xxxx", 29 .deliver = afs_deliver_cm_op_id, 30 }; 31 32 /* 33 * open an RxRPC socket and bind it to be a server for callback notifications 34 * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT 35 */ 36 int afs_open_socket(struct afs_net *net) 37 { 38 struct sockaddr_rxrpc srx; 39 struct socket *socket; 40 int ret; 41 42 _enter(""); 43 44 ret = sock_create_kern(net->net, AF_RXRPC, SOCK_DGRAM, PF_INET6, &socket); 45 if (ret < 0) 46 goto error_1; 47 48 socket->sk->sk_allocation = GFP_NOFS; 49 50 /* bind the callback manager's address to make this a server socket */ 51 memset(&srx, 0, sizeof(srx)); 52 srx.srx_family = AF_RXRPC; 53 srx.srx_service = CM_SERVICE; 54 srx.transport_type = SOCK_DGRAM; 55 srx.transport_len = sizeof(srx.transport.sin6); 56 srx.transport.sin6.sin6_family = AF_INET6; 57 srx.transport.sin6.sin6_port = htons(AFS_CM_PORT); 58 59 ret = rxrpc_sock_set_min_security_level(socket->sk, 60 RXRPC_SECURITY_ENCRYPT); 61 if (ret < 0) 62 goto error_2; 63 64 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); 65 if (ret == -EADDRINUSE) { 66 srx.transport.sin6.sin6_port = 0; 67 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); 68 } 69 if (ret < 0) 70 goto error_2; 71 72 srx.srx_service = YFS_CM_SERVICE; 73 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); 74 if (ret < 0) 75 goto error_2; 76 77 /* Ideally, we'd turn on service upgrade here, but we can't because 78 * OpenAFS is buggy and leaks the userStatus field from packet to 79 * packet and between FS packets and CB packets - so if we try to do an 80 * upgrade on an FS packet, OpenAFS will leak that into the CB packet 81 * it sends back to us. 82 */ 83 84 rxrpc_kernel_new_call_notification(socket, afs_rx_new_call, 85 afs_rx_discard_new_call); 86 87 ret = kernel_listen(socket, INT_MAX); 88 if (ret < 0) 89 goto error_2; 90 91 net->socket = socket; 92 afs_charge_preallocation(&net->charge_preallocation_work); 93 _leave(" = 0"); 94 return 0; 95 96 error_2: 97 sock_release(socket); 98 error_1: 99 _leave(" = %d", ret); 100 return ret; 101 } 102 103 /* 104 * close the RxRPC socket AFS was using 105 */ 106 void afs_close_socket(struct afs_net *net) 107 { 108 _enter(""); 109 110 kernel_listen(net->socket, 0); 111 flush_workqueue(afs_async_calls); 112 113 if (net->spare_incoming_call) { 114 afs_put_call(net->spare_incoming_call); 115 net->spare_incoming_call = NULL; 116 } 117 118 _debug("outstanding %u", atomic_read(&net->nr_outstanding_calls)); 119 wait_var_event(&net->nr_outstanding_calls, 120 !atomic_read(&net->nr_outstanding_calls)); 121 _debug("no outstanding calls"); 122 123 kernel_sock_shutdown(net->socket, SHUT_RDWR); 124 flush_workqueue(afs_async_calls); 125 sock_release(net->socket); 126 127 _debug("dework"); 128 _leave(""); 129 } 130 131 /* 132 * Allocate a call. 133 */ 134 static struct afs_call *afs_alloc_call(struct afs_net *net, 135 const struct afs_call_type *type, 136 gfp_t gfp) 137 { 138 struct afs_call *call; 139 int o; 140 141 call = kzalloc(sizeof(*call), gfp); 142 if (!call) 143 return NULL; 144 145 call->type = type; 146 call->net = net; 147 call->debug_id = atomic_inc_return(&rxrpc_debug_id); 148 atomic_set(&call->usage, 1); 149 INIT_WORK(&call->async_work, afs_process_async_call); 150 init_waitqueue_head(&call->waitq); 151 spin_lock_init(&call->state_lock); 152 call->iter = &call->def_iter; 153 154 o = atomic_inc_return(&net->nr_outstanding_calls); 155 trace_afs_call(call, afs_call_trace_alloc, 1, o, 156 __builtin_return_address(0)); 157 return call; 158 } 159 160 /* 161 * Dispose of a reference on a call. 162 */ 163 void afs_put_call(struct afs_call *call) 164 { 165 struct afs_net *net = call->net; 166 int n = atomic_dec_return(&call->usage); 167 int o = atomic_read(&net->nr_outstanding_calls); 168 169 trace_afs_call(call, afs_call_trace_put, n, o, 170 __builtin_return_address(0)); 171 172 ASSERTCMP(n, >=, 0); 173 if (n == 0) { 174 ASSERT(!work_pending(&call->async_work)); 175 ASSERT(call->type->name != NULL); 176 177 if (call->rxcall) { 178 rxrpc_kernel_end_call(net->socket, call->rxcall); 179 call->rxcall = NULL; 180 } 181 if (call->type->destructor) 182 call->type->destructor(call); 183 184 afs_unuse_server_notime(call->net, call->server, afs_server_trace_put_call); 185 afs_put_addrlist(call->alist); 186 kfree(call->request); 187 188 trace_afs_call(call, afs_call_trace_free, 0, o, 189 __builtin_return_address(0)); 190 kfree(call); 191 192 o = atomic_dec_return(&net->nr_outstanding_calls); 193 if (o == 0) 194 wake_up_var(&net->nr_outstanding_calls); 195 } 196 } 197 198 static struct afs_call *afs_get_call(struct afs_call *call, 199 enum afs_call_trace why) 200 { 201 int u = atomic_inc_return(&call->usage); 202 203 trace_afs_call(call, why, u, 204 atomic_read(&call->net->nr_outstanding_calls), 205 __builtin_return_address(0)); 206 return call; 207 } 208 209 /* 210 * Queue the call for actual work. 211 */ 212 static void afs_queue_call_work(struct afs_call *call) 213 { 214 if (call->type->work) { 215 INIT_WORK(&call->work, call->type->work); 216 217 afs_get_call(call, afs_call_trace_work); 218 if (!queue_work(afs_wq, &call->work)) 219 afs_put_call(call); 220 } 221 } 222 223 /* 224 * allocate a call with flat request and reply buffers 225 */ 226 struct afs_call *afs_alloc_flat_call(struct afs_net *net, 227 const struct afs_call_type *type, 228 size_t request_size, size_t reply_max) 229 { 230 struct afs_call *call; 231 232 call = afs_alloc_call(net, type, GFP_NOFS); 233 if (!call) 234 goto nomem_call; 235 236 if (request_size) { 237 call->request_size = request_size; 238 call->request = kmalloc(request_size, GFP_NOFS); 239 if (!call->request) 240 goto nomem_free; 241 } 242 243 if (reply_max) { 244 call->reply_max = reply_max; 245 call->buffer = kmalloc(reply_max, GFP_NOFS); 246 if (!call->buffer) 247 goto nomem_free; 248 } 249 250 afs_extract_to_buf(call, call->reply_max); 251 call->operation_ID = type->op; 252 init_waitqueue_head(&call->waitq); 253 return call; 254 255 nomem_free: 256 afs_put_call(call); 257 nomem_call: 258 return NULL; 259 } 260 261 /* 262 * clean up a call with flat buffer 263 */ 264 void afs_flat_call_destructor(struct afs_call *call) 265 { 266 _enter(""); 267 268 kfree(call->request); 269 call->request = NULL; 270 kfree(call->buffer); 271 call->buffer = NULL; 272 } 273 274 /* 275 * Advance the AFS call state when the RxRPC call ends the transmit phase. 276 */ 277 static void afs_notify_end_request_tx(struct sock *sock, 278 struct rxrpc_call *rxcall, 279 unsigned long call_user_ID) 280 { 281 struct afs_call *call = (struct afs_call *)call_user_ID; 282 283 afs_set_call_state(call, AFS_CALL_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY); 284 } 285 286 /* 287 * Initiate a call and synchronously queue up the parameters for dispatch. Any 288 * error is stored into the call struct, which the caller must check for. 289 */ 290 void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp) 291 { 292 struct sockaddr_rxrpc *srx = &ac->alist->addrs[ac->index]; 293 struct rxrpc_call *rxcall; 294 struct msghdr msg; 295 struct kvec iov[1]; 296 size_t len; 297 s64 tx_total_len; 298 int ret; 299 300 _enter(",{%pISp},", &srx->transport); 301 302 ASSERT(call->type != NULL); 303 ASSERT(call->type->name != NULL); 304 305 _debug("____MAKE %p{%s,%x} [%d]____", 306 call, call->type->name, key_serial(call->key), 307 atomic_read(&call->net->nr_outstanding_calls)); 308 309 call->addr_ix = ac->index; 310 call->alist = afs_get_addrlist(ac->alist); 311 312 /* Work out the length we're going to transmit. This is awkward for 313 * calls such as FS.StoreData where there's an extra injection of data 314 * after the initial fixed part. 315 */ 316 tx_total_len = call->request_size; 317 if (call->write_iter) 318 tx_total_len += iov_iter_count(call->write_iter); 319 320 /* If the call is going to be asynchronous, we need an extra ref for 321 * the call to hold itself so the caller need not hang on to its ref. 322 */ 323 if (call->async) { 324 afs_get_call(call, afs_call_trace_get); 325 call->drop_ref = true; 326 } 327 328 /* create a call */ 329 rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key, 330 (unsigned long)call, 331 tx_total_len, gfp, 332 (call->async ? 333 afs_wake_up_async_call : 334 afs_wake_up_call_waiter), 335 call->upgrade, 336 (call->intr ? RXRPC_PREINTERRUPTIBLE : 337 RXRPC_UNINTERRUPTIBLE), 338 call->debug_id); 339 if (IS_ERR(rxcall)) { 340 ret = PTR_ERR(rxcall); 341 call->error = ret; 342 goto error_kill_call; 343 } 344 345 call->rxcall = rxcall; 346 347 if (call->max_lifespan) 348 rxrpc_kernel_set_max_life(call->net->socket, rxcall, 349 call->max_lifespan); 350 351 /* send the request */ 352 iov[0].iov_base = call->request; 353 iov[0].iov_len = call->request_size; 354 355 msg.msg_name = NULL; 356 msg.msg_namelen = 0; 357 iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, call->request_size); 358 msg.msg_control = NULL; 359 msg.msg_controllen = 0; 360 msg.msg_flags = MSG_WAITALL | (call->write_iter ? MSG_MORE : 0); 361 362 ret = rxrpc_kernel_send_data(call->net->socket, rxcall, 363 &msg, call->request_size, 364 afs_notify_end_request_tx); 365 if (ret < 0) 366 goto error_do_abort; 367 368 if (call->write_iter) { 369 msg.msg_iter = *call->write_iter; 370 msg.msg_flags &= ~MSG_MORE; 371 trace_afs_send_data(call, &msg); 372 373 ret = rxrpc_kernel_send_data(call->net->socket, 374 call->rxcall, &msg, 375 iov_iter_count(&msg.msg_iter), 376 afs_notify_end_request_tx); 377 *call->write_iter = msg.msg_iter; 378 379 trace_afs_sent_data(call, &msg, ret); 380 if (ret < 0) 381 goto error_do_abort; 382 } 383 384 /* Note that at this point, we may have received the reply or an abort 385 * - and an asynchronous call may already have completed. 386 * 387 * afs_wait_for_call_to_complete(call, ac) 388 * must be called to synchronously clean up. 389 */ 390 return; 391 392 error_do_abort: 393 if (ret != -ECONNABORTED) { 394 rxrpc_kernel_abort_call(call->net->socket, rxcall, 395 RX_USER_ABORT, ret, "KSD"); 396 } else { 397 len = 0; 398 iov_iter_kvec(&msg.msg_iter, READ, NULL, 0, 0); 399 rxrpc_kernel_recv_data(call->net->socket, rxcall, 400 &msg.msg_iter, &len, false, 401 &call->abort_code, &call->service_id); 402 ac->abort_code = call->abort_code; 403 ac->responded = true; 404 } 405 call->error = ret; 406 trace_afs_call_done(call); 407 error_kill_call: 408 if (call->type->done) 409 call->type->done(call); 410 411 /* We need to dispose of the extra ref we grabbed for an async call. 412 * The call, however, might be queued on afs_async_calls and we need to 413 * make sure we don't get any more notifications that might requeue it. 414 */ 415 if (call->rxcall) { 416 rxrpc_kernel_end_call(call->net->socket, call->rxcall); 417 call->rxcall = NULL; 418 } 419 if (call->async) { 420 if (cancel_work_sync(&call->async_work)) 421 afs_put_call(call); 422 afs_put_call(call); 423 } 424 425 ac->error = ret; 426 call->state = AFS_CALL_COMPLETE; 427 _leave(" = %d", ret); 428 } 429 430 /* 431 * Log remote abort codes that indicate that we have a protocol disagreement 432 * with the server. 433 */ 434 static void afs_log_error(struct afs_call *call, s32 remote_abort) 435 { 436 static int max = 0; 437 const char *msg; 438 int m; 439 440 switch (remote_abort) { 441 case RX_EOF: msg = "unexpected EOF"; break; 442 case RXGEN_CC_MARSHAL: msg = "client marshalling"; break; 443 case RXGEN_CC_UNMARSHAL: msg = "client unmarshalling"; break; 444 case RXGEN_SS_MARSHAL: msg = "server marshalling"; break; 445 case RXGEN_SS_UNMARSHAL: msg = "server unmarshalling"; break; 446 case RXGEN_DECODE: msg = "opcode decode"; break; 447 case RXGEN_SS_XDRFREE: msg = "server XDR cleanup"; break; 448 case RXGEN_CC_XDRFREE: msg = "client XDR cleanup"; break; 449 case -32: msg = "insufficient data"; break; 450 default: 451 return; 452 } 453 454 m = max; 455 if (m < 3) { 456 max = m + 1; 457 pr_notice("kAFS: Peer reported %s failure on %s [%pISp]\n", 458 msg, call->type->name, 459 &call->alist->addrs[call->addr_ix].transport); 460 } 461 } 462 463 /* 464 * deliver messages to a call 465 */ 466 static void afs_deliver_to_call(struct afs_call *call) 467 { 468 enum afs_call_state state; 469 size_t len; 470 u32 abort_code, remote_abort = 0; 471 int ret; 472 473 _enter("%s", call->type->name); 474 475 while (state = READ_ONCE(call->state), 476 state == AFS_CALL_CL_AWAIT_REPLY || 477 state == AFS_CALL_SV_AWAIT_OP_ID || 478 state == AFS_CALL_SV_AWAIT_REQUEST || 479 state == AFS_CALL_SV_AWAIT_ACK 480 ) { 481 if (state == AFS_CALL_SV_AWAIT_ACK) { 482 len = 0; 483 iov_iter_kvec(&call->def_iter, READ, NULL, 0, 0); 484 ret = rxrpc_kernel_recv_data(call->net->socket, 485 call->rxcall, &call->def_iter, 486 &len, false, &remote_abort, 487 &call->service_id); 488 trace_afs_receive_data(call, &call->def_iter, false, ret); 489 490 if (ret == -EINPROGRESS || ret == -EAGAIN) 491 return; 492 if (ret < 0 || ret == 1) { 493 if (ret == 1) 494 ret = 0; 495 goto call_complete; 496 } 497 return; 498 } 499 500 if (!call->have_reply_time && 501 rxrpc_kernel_get_reply_time(call->net->socket, 502 call->rxcall, 503 &call->reply_time)) 504 call->have_reply_time = true; 505 506 ret = call->type->deliver(call); 507 state = READ_ONCE(call->state); 508 if (ret == 0 && call->unmarshalling_error) 509 ret = -EBADMSG; 510 switch (ret) { 511 case 0: 512 afs_queue_call_work(call); 513 if (state == AFS_CALL_CL_PROC_REPLY) { 514 if (call->op) 515 set_bit(AFS_SERVER_FL_MAY_HAVE_CB, 516 &call->op->server->flags); 517 goto call_complete; 518 } 519 ASSERTCMP(state, >, AFS_CALL_CL_PROC_REPLY); 520 goto done; 521 case -EINPROGRESS: 522 case -EAGAIN: 523 goto out; 524 case -ECONNABORTED: 525 ASSERTCMP(state, ==, AFS_CALL_COMPLETE); 526 afs_log_error(call, call->abort_code); 527 goto done; 528 case -ENOTSUPP: 529 abort_code = RXGEN_OPCODE; 530 rxrpc_kernel_abort_call(call->net->socket, call->rxcall, 531 abort_code, ret, "KIV"); 532 goto local_abort; 533 case -EIO: 534 pr_err("kAFS: Call %u in bad state %u\n", 535 call->debug_id, state); 536 fallthrough; 537 case -ENODATA: 538 case -EBADMSG: 539 case -EMSGSIZE: 540 case -ENOMEM: 541 case -EFAULT: 542 abort_code = RXGEN_CC_UNMARSHAL; 543 if (state != AFS_CALL_CL_AWAIT_REPLY) 544 abort_code = RXGEN_SS_UNMARSHAL; 545 rxrpc_kernel_abort_call(call->net->socket, call->rxcall, 546 abort_code, ret, "KUM"); 547 goto local_abort; 548 default: 549 abort_code = RX_CALL_DEAD; 550 rxrpc_kernel_abort_call(call->net->socket, call->rxcall, 551 abort_code, ret, "KER"); 552 goto local_abort; 553 } 554 } 555 556 done: 557 if (call->type->done) 558 call->type->done(call); 559 out: 560 _leave(""); 561 return; 562 563 local_abort: 564 abort_code = 0; 565 call_complete: 566 afs_set_call_complete(call, ret, remote_abort); 567 state = AFS_CALL_COMPLETE; 568 goto done; 569 } 570 571 /* 572 * Wait synchronously for a call to complete and clean up the call struct. 573 */ 574 long afs_wait_for_call_to_complete(struct afs_call *call, 575 struct afs_addr_cursor *ac) 576 { 577 long ret; 578 bool rxrpc_complete = false; 579 580 DECLARE_WAITQUEUE(myself, current); 581 582 _enter(""); 583 584 ret = call->error; 585 if (ret < 0) 586 goto out; 587 588 add_wait_queue(&call->waitq, &myself); 589 for (;;) { 590 set_current_state(TASK_UNINTERRUPTIBLE); 591 592 /* deliver any messages that are in the queue */ 593 if (!afs_check_call_state(call, AFS_CALL_COMPLETE) && 594 call->need_attention) { 595 call->need_attention = false; 596 __set_current_state(TASK_RUNNING); 597 afs_deliver_to_call(call); 598 continue; 599 } 600 601 if (afs_check_call_state(call, AFS_CALL_COMPLETE)) 602 break; 603 604 if (!rxrpc_kernel_check_life(call->net->socket, call->rxcall)) { 605 /* rxrpc terminated the call. */ 606 rxrpc_complete = true; 607 break; 608 } 609 610 schedule(); 611 } 612 613 remove_wait_queue(&call->waitq, &myself); 614 __set_current_state(TASK_RUNNING); 615 616 if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) { 617 if (rxrpc_complete) { 618 afs_set_call_complete(call, call->error, call->abort_code); 619 } else { 620 /* Kill off the call if it's still live. */ 621 _debug("call interrupted"); 622 if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall, 623 RX_USER_ABORT, -EINTR, "KWI")) 624 afs_set_call_complete(call, -EINTR, 0); 625 } 626 } 627 628 spin_lock_bh(&call->state_lock); 629 ac->abort_code = call->abort_code; 630 ac->error = call->error; 631 spin_unlock_bh(&call->state_lock); 632 633 ret = ac->error; 634 switch (ret) { 635 case 0: 636 ret = call->ret0; 637 call->ret0 = 0; 638 639 fallthrough; 640 case -ECONNABORTED: 641 ac->responded = true; 642 break; 643 } 644 645 out: 646 _debug("call complete"); 647 afs_put_call(call); 648 _leave(" = %p", (void *)ret); 649 return ret; 650 } 651 652 /* 653 * wake up a waiting call 654 */ 655 static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall, 656 unsigned long call_user_ID) 657 { 658 struct afs_call *call = (struct afs_call *)call_user_ID; 659 660 call->need_attention = true; 661 wake_up(&call->waitq); 662 } 663 664 /* 665 * wake up an asynchronous call 666 */ 667 static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall, 668 unsigned long call_user_ID) 669 { 670 struct afs_call *call = (struct afs_call *)call_user_ID; 671 int u; 672 673 trace_afs_notify_call(rxcall, call); 674 call->need_attention = true; 675 676 u = atomic_fetch_add_unless(&call->usage, 1, 0); 677 if (u != 0) { 678 trace_afs_call(call, afs_call_trace_wake, u + 1, 679 atomic_read(&call->net->nr_outstanding_calls), 680 __builtin_return_address(0)); 681 682 if (!queue_work(afs_async_calls, &call->async_work)) 683 afs_put_call(call); 684 } 685 } 686 687 /* 688 * Perform I/O processing on an asynchronous call. The work item carries a ref 689 * to the call struct that we either need to release or to pass on. 690 */ 691 static void afs_process_async_call(struct work_struct *work) 692 { 693 struct afs_call *call = container_of(work, struct afs_call, async_work); 694 695 _enter(""); 696 697 if (call->state < AFS_CALL_COMPLETE && call->need_attention) { 698 call->need_attention = false; 699 afs_deliver_to_call(call); 700 } 701 702 afs_put_call(call); 703 _leave(""); 704 } 705 706 static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID) 707 { 708 struct afs_call *call = (struct afs_call *)user_call_ID; 709 710 call->rxcall = rxcall; 711 } 712 713 /* 714 * Charge the incoming call preallocation. 715 */ 716 void afs_charge_preallocation(struct work_struct *work) 717 { 718 struct afs_net *net = 719 container_of(work, struct afs_net, charge_preallocation_work); 720 struct afs_call *call = net->spare_incoming_call; 721 722 for (;;) { 723 if (!call) { 724 call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL); 725 if (!call) 726 break; 727 728 call->drop_ref = true; 729 call->async = true; 730 call->state = AFS_CALL_SV_AWAIT_OP_ID; 731 init_waitqueue_head(&call->waitq); 732 afs_extract_to_tmp(call); 733 } 734 735 if (rxrpc_kernel_charge_accept(net->socket, 736 afs_wake_up_async_call, 737 afs_rx_attach, 738 (unsigned long)call, 739 GFP_KERNEL, 740 call->debug_id) < 0) 741 break; 742 call = NULL; 743 } 744 net->spare_incoming_call = call; 745 } 746 747 /* 748 * Discard a preallocated call when a socket is shut down. 749 */ 750 static void afs_rx_discard_new_call(struct rxrpc_call *rxcall, 751 unsigned long user_call_ID) 752 { 753 struct afs_call *call = (struct afs_call *)user_call_ID; 754 755 call->rxcall = NULL; 756 afs_put_call(call); 757 } 758 759 /* 760 * Notification of an incoming call. 761 */ 762 static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall, 763 unsigned long user_call_ID) 764 { 765 struct afs_net *net = afs_sock2net(sk); 766 767 queue_work(afs_wq, &net->charge_preallocation_work); 768 } 769 770 /* 771 * Grab the operation ID from an incoming cache manager call. The socket 772 * buffer is discarded on error or if we don't yet have sufficient data. 773 */ 774 static int afs_deliver_cm_op_id(struct afs_call *call) 775 { 776 int ret; 777 778 _enter("{%zu}", iov_iter_count(call->iter)); 779 780 /* the operation ID forms the first four bytes of the request data */ 781 ret = afs_extract_data(call, true); 782 if (ret < 0) 783 return ret; 784 785 call->operation_ID = ntohl(call->tmp); 786 afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST); 787 788 /* ask the cache manager to route the call (it'll change the call type 789 * if successful) */ 790 if (!afs_cm_incoming_call(call)) 791 return -ENOTSUPP; 792 793 trace_afs_cb_call(call); 794 795 /* pass responsibility for the remainer of this message off to the 796 * cache manager op */ 797 return call->type->deliver(call); 798 } 799 800 /* 801 * Advance the AFS call state when an RxRPC service call ends the transmit 802 * phase. 803 */ 804 static void afs_notify_end_reply_tx(struct sock *sock, 805 struct rxrpc_call *rxcall, 806 unsigned long call_user_ID) 807 { 808 struct afs_call *call = (struct afs_call *)call_user_ID; 809 810 afs_set_call_state(call, AFS_CALL_SV_REPLYING, AFS_CALL_SV_AWAIT_ACK); 811 } 812 813 /* 814 * send an empty reply 815 */ 816 void afs_send_empty_reply(struct afs_call *call) 817 { 818 struct afs_net *net = call->net; 819 struct msghdr msg; 820 821 _enter(""); 822 823 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0); 824 825 msg.msg_name = NULL; 826 msg.msg_namelen = 0; 827 iov_iter_kvec(&msg.msg_iter, WRITE, NULL, 0, 0); 828 msg.msg_control = NULL; 829 msg.msg_controllen = 0; 830 msg.msg_flags = 0; 831 832 switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0, 833 afs_notify_end_reply_tx)) { 834 case 0: 835 _leave(" [replied]"); 836 return; 837 838 case -ENOMEM: 839 _debug("oom"); 840 rxrpc_kernel_abort_call(net->socket, call->rxcall, 841 RXGEN_SS_MARSHAL, -ENOMEM, "KOO"); 842 fallthrough; 843 default: 844 _leave(" [error]"); 845 return; 846 } 847 } 848 849 /* 850 * send a simple reply 851 */ 852 void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) 853 { 854 struct afs_net *net = call->net; 855 struct msghdr msg; 856 struct kvec iov[1]; 857 int n; 858 859 _enter(""); 860 861 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len); 862 863 iov[0].iov_base = (void *) buf; 864 iov[0].iov_len = len; 865 msg.msg_name = NULL; 866 msg.msg_namelen = 0; 867 iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, len); 868 msg.msg_control = NULL; 869 msg.msg_controllen = 0; 870 msg.msg_flags = 0; 871 872 n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len, 873 afs_notify_end_reply_tx); 874 if (n >= 0) { 875 /* Success */ 876 _leave(" [replied]"); 877 return; 878 } 879 880 if (n == -ENOMEM) { 881 _debug("oom"); 882 rxrpc_kernel_abort_call(net->socket, call->rxcall, 883 RXGEN_SS_MARSHAL, -ENOMEM, "KOO"); 884 } 885 _leave(" [error]"); 886 } 887 888 /* 889 * Extract a piece of data from the received data socket buffers. 890 */ 891 int afs_extract_data(struct afs_call *call, bool want_more) 892 { 893 struct afs_net *net = call->net; 894 struct iov_iter *iter = call->iter; 895 enum afs_call_state state; 896 u32 remote_abort = 0; 897 int ret; 898 899 _enter("{%s,%zu,%zu},%d", 900 call->type->name, call->iov_len, iov_iter_count(iter), want_more); 901 902 ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, iter, 903 &call->iov_len, want_more, &remote_abort, 904 &call->service_id); 905 if (ret == 0 || ret == -EAGAIN) 906 return ret; 907 908 state = READ_ONCE(call->state); 909 if (ret == 1) { 910 switch (state) { 911 case AFS_CALL_CL_AWAIT_REPLY: 912 afs_set_call_state(call, state, AFS_CALL_CL_PROC_REPLY); 913 break; 914 case AFS_CALL_SV_AWAIT_REQUEST: 915 afs_set_call_state(call, state, AFS_CALL_SV_REPLYING); 916 break; 917 case AFS_CALL_COMPLETE: 918 kdebug("prem complete %d", call->error); 919 return afs_io_error(call, afs_io_error_extract); 920 default: 921 break; 922 } 923 return 0; 924 } 925 926 afs_set_call_complete(call, ret, remote_abort); 927 return ret; 928 } 929 930 /* 931 * Log protocol error production. 932 */ 933 noinline int afs_protocol_error(struct afs_call *call, 934 enum afs_eproto_cause cause) 935 { 936 trace_afs_protocol_error(call, cause); 937 if (call) 938 call->unmarshalling_error = true; 939 return -EBADMSG; 940 } 941