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