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1// SPDX-License-Identifier: GPL-2.0-or-later2/* Maintain an RxRPC server socket to do AFS communications through3 *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_ENUMS17#include <trace/events/rxrpc.h>18 19struct workqueue_struct *afs_async_calls;20 21static void afs_deferred_free_worker(struct work_struct *work);22static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);23static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);24static void afs_process_async_call(struct work_struct *);25static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);26static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long);27static int afs_deliver_cm_op_id(struct afs_call *);28 29/* asynchronous incoming call initial processing */30static const struct afs_call_type afs_RXCMxxxx = {31 .name = "CB.xxxx",32 .deliver = afs_deliver_cm_op_id,33};34 35/*36 * open an RxRPC socket and bind it to be a server for callback notifications37 * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT38 */39int afs_open_socket(struct afs_net *net)40{41 struct sockaddr_rxrpc srx;42 struct socket *socket;43 int ret;44 45 _enter("");46 47 ret = sock_create_kern(net->net, AF_RXRPC, SOCK_DGRAM, PF_INET6, &socket);48 if (ret < 0)49 goto error_1;50 51 socket->sk->sk_allocation = GFP_NOFS;52 53 /* bind the callback manager's address to make this a server socket */54 memset(&srx, 0, sizeof(srx));55 srx.srx_family = AF_RXRPC;56 srx.srx_service = CM_SERVICE;57 srx.transport_type = SOCK_DGRAM;58 srx.transport_len = sizeof(srx.transport.sin6);59 srx.transport.sin6.sin6_family = AF_INET6;60 srx.transport.sin6.sin6_port = htons(AFS_CM_PORT);61 62 ret = rxrpc_sock_set_min_security_level(socket->sk,63 RXRPC_SECURITY_ENCRYPT);64 if (ret < 0)65 goto error_2;66 67 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));68 if (ret == -EADDRINUSE) {69 srx.transport.sin6.sin6_port = 0;70 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));71 }72 if (ret < 0)73 goto error_2;74 75 srx.srx_service = YFS_CM_SERVICE;76 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));77 if (ret < 0)78 goto error_2;79 80 /* Ideally, we'd turn on service upgrade here, but we can't because81 * OpenAFS is buggy and leaks the userStatus field from packet to82 * packet and between FS packets and CB packets - so if we try to do an83 * upgrade on an FS packet, OpenAFS will leak that into the CB packet84 * it sends back to us.85 */86 87 rxrpc_kernel_new_call_notification(socket, afs_rx_new_call,88 afs_rx_discard_new_call);89 90 ret = kernel_listen(socket, INT_MAX);91 if (ret < 0)92 goto error_2;93 94 net->socket = socket;95 afs_charge_preallocation(&net->charge_preallocation_work);96 _leave(" = 0");97 return 0;98 99error_2:100 sock_release(socket);101error_1:102 _leave(" = %d", ret);103 return ret;104}105 106/*107 * close the RxRPC socket AFS was using108 */109void afs_close_socket(struct afs_net *net)110{111 _enter("");112 113 kernel_listen(net->socket, 0);114 flush_workqueue(afs_async_calls);115 116 if (net->spare_incoming_call) {117 afs_put_call(net->spare_incoming_call);118 net->spare_incoming_call = NULL;119 }120 121 _debug("outstanding %u", atomic_read(&net->nr_outstanding_calls));122 wait_var_event(&net->nr_outstanding_calls,123 !atomic_read(&net->nr_outstanding_calls));124 _debug("no outstanding calls");125 126 kernel_sock_shutdown(net->socket, SHUT_RDWR);127 flush_workqueue(afs_async_calls);128 sock_release(net->socket);129 130 _debug("dework");131 _leave("");132}133 134/*135 * Allocate a call.136 */137static struct afs_call *afs_alloc_call(struct afs_net *net,138 const struct afs_call_type *type,139 gfp_t gfp)140{141 struct afs_call *call;142 int o;143 144 call = kzalloc(sizeof(*call), gfp);145 if (!call)146 return NULL;147 148 call->type = type;149 call->net = net;150 call->debug_id = atomic_inc_return(&rxrpc_debug_id);151 refcount_set(&call->ref, 1);152 INIT_WORK(&call->async_work, afs_process_async_call);153 INIT_WORK(&call->free_work, afs_deferred_free_worker);154 init_waitqueue_head(&call->waitq);155 spin_lock_init(&call->state_lock);156 call->iter = &call->def_iter;157 158 o = atomic_inc_return(&net->nr_outstanding_calls);159 trace_afs_call(call->debug_id, afs_call_trace_alloc, 1, o,160 __builtin_return_address(0));161 return call;162}163 164static void afs_free_call(struct afs_call *call)165{166 struct afs_net *net = call->net;167 int o;168 169 ASSERT(!work_pending(&call->async_work));170 171 rxrpc_kernel_put_peer(call->peer);172 173 if (call->rxcall) {174 rxrpc_kernel_shutdown_call(net->socket, call->rxcall);175 rxrpc_kernel_put_call(net->socket, call->rxcall);176 call->rxcall = NULL;177 }178 if (call->type->destructor)179 call->type->destructor(call);180 181 afs_unuse_server_notime(call->net, call->server, afs_server_trace_put_call);182 kfree(call->request);183 184 o = atomic_read(&net->nr_outstanding_calls);185 trace_afs_call(call->debug_id, afs_call_trace_free, 0, o,186 __builtin_return_address(0));187 kfree(call);188 189 o = atomic_dec_return(&net->nr_outstanding_calls);190 if (o == 0)191 wake_up_var(&net->nr_outstanding_calls);192}193 194/*195 * Dispose of a reference on a call.196 */197void afs_put_call(struct afs_call *call)198{199 struct afs_net *net = call->net;200 unsigned int debug_id = call->debug_id;201 bool zero;202 int r, o;203 204 zero = __refcount_dec_and_test(&call->ref, &r);205 o = atomic_read(&net->nr_outstanding_calls);206 trace_afs_call(debug_id, afs_call_trace_put, r - 1, o,207 __builtin_return_address(0));208 if (zero)209 afs_free_call(call);210}211 212static void afs_deferred_free_worker(struct work_struct *work)213{214 struct afs_call *call = container_of(work, struct afs_call, free_work);215 216 afs_free_call(call);217}218 219/*220 * Dispose of a reference on a call, deferring the cleanup to a workqueue221 * to avoid lock recursion.222 */223void afs_deferred_put_call(struct afs_call *call)224{225 struct afs_net *net = call->net;226 unsigned int debug_id = call->debug_id;227 bool zero;228 int r, o;229 230 zero = __refcount_dec_and_test(&call->ref, &r);231 o = atomic_read(&net->nr_outstanding_calls);232 trace_afs_call(debug_id, afs_call_trace_put, r - 1, o,233 __builtin_return_address(0));234 if (zero)235 schedule_work(&call->free_work);236}237 238static struct afs_call *afs_get_call(struct afs_call *call,239 enum afs_call_trace why)240{241 int r;242 243 __refcount_inc(&call->ref, &r);244 245 trace_afs_call(call->debug_id, why, r + 1,246 atomic_read(&call->net->nr_outstanding_calls),247 __builtin_return_address(0));248 return call;249}250 251/*252 * Queue the call for actual work.253 */254static void afs_queue_call_work(struct afs_call *call)255{256 if (call->type->work) {257 INIT_WORK(&call->work, call->type->work);258 259 afs_get_call(call, afs_call_trace_work);260 if (!queue_work(afs_wq, &call->work))261 afs_put_call(call);262 }263}264 265/*266 * allocate a call with flat request and reply buffers267 */268struct afs_call *afs_alloc_flat_call(struct afs_net *net,269 const struct afs_call_type *type,270 size_t request_size, size_t reply_max)271{272 struct afs_call *call;273 274 call = afs_alloc_call(net, type, GFP_NOFS);275 if (!call)276 goto nomem_call;277 278 if (request_size) {279 call->request_size = request_size;280 call->request = kmalloc(request_size, GFP_NOFS);281 if (!call->request)282 goto nomem_free;283 }284 285 if (reply_max) {286 call->reply_max = reply_max;287 call->buffer = kmalloc(reply_max, GFP_NOFS);288 if (!call->buffer)289 goto nomem_free;290 }291 292 afs_extract_to_buf(call, call->reply_max);293 call->operation_ID = type->op;294 init_waitqueue_head(&call->waitq);295 return call;296 297nomem_free:298 afs_put_call(call);299nomem_call:300 return NULL;301}302 303/*304 * clean up a call with flat buffer305 */306void afs_flat_call_destructor(struct afs_call *call)307{308 _enter("");309 310 kfree(call->request);311 call->request = NULL;312 kfree(call->buffer);313 call->buffer = NULL;314}315 316/*317 * Advance the AFS call state when the RxRPC call ends the transmit phase.318 */319static void afs_notify_end_request_tx(struct sock *sock,320 struct rxrpc_call *rxcall,321 unsigned long call_user_ID)322{323 struct afs_call *call = (struct afs_call *)call_user_ID;324 325 afs_set_call_state(call, AFS_CALL_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY);326}327 328/*329 * Initiate a call and synchronously queue up the parameters for dispatch. Any330 * error is stored into the call struct, which the caller must check for.331 */332void afs_make_call(struct afs_call *call, gfp_t gfp)333{334 struct rxrpc_call *rxcall;335 struct msghdr msg;336 struct kvec iov[1];337 size_t len;338 s64 tx_total_len;339 int ret;340 341 _enter(",{%pISp+%u},", rxrpc_kernel_remote_addr(call->peer), call->service_id);342 343 ASSERT(call->type != NULL);344 ASSERT(call->type->name != NULL);345 346 _debug("____MAKE %p{%s,%x} [%d]____",347 call, call->type->name, key_serial(call->key),348 atomic_read(&call->net->nr_outstanding_calls));349 350 trace_afs_make_call(call);351 352 /* Work out the length we're going to transmit. This is awkward for353 * calls such as FS.StoreData where there's an extra injection of data354 * after the initial fixed part.355 */356 tx_total_len = call->request_size;357 if (call->write_iter)358 tx_total_len += iov_iter_count(call->write_iter);359 360 /* If the call is going to be asynchronous, we need an extra ref for361 * the call to hold itself so the caller need not hang on to its ref.362 */363 if (call->async) {364 afs_get_call(call, afs_call_trace_get);365 call->drop_ref = true;366 }367 368 /* create a call */369 rxcall = rxrpc_kernel_begin_call(call->net->socket, call->peer, call->key,370 (unsigned long)call,371 tx_total_len,372 call->max_lifespan,373 gfp,374 (call->async ?375 afs_wake_up_async_call :376 afs_wake_up_call_waiter),377 call->service_id,378 call->upgrade,379 (call->intr ? RXRPC_PREINTERRUPTIBLE :380 RXRPC_UNINTERRUPTIBLE),381 call->debug_id);382 if (IS_ERR(rxcall)) {383 ret = PTR_ERR(rxcall);384 call->error = ret;385 goto error_kill_call;386 }387 388 call->rxcall = rxcall;389 call->issue_time = ktime_get_real();390 391 /* send the request */392 iov[0].iov_base = call->request;393 iov[0].iov_len = call->request_size;394 395 msg.msg_name = NULL;396 msg.msg_namelen = 0;397 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, call->request_size);398 msg.msg_control = NULL;399 msg.msg_controllen = 0;400 msg.msg_flags = MSG_WAITALL | (call->write_iter ? MSG_MORE : 0);401 402 ret = rxrpc_kernel_send_data(call->net->socket, rxcall,403 &msg, call->request_size,404 afs_notify_end_request_tx);405 if (ret < 0)406 goto error_do_abort;407 408 if (call->write_iter) {409 msg.msg_iter = *call->write_iter;410 msg.msg_flags &= ~MSG_MORE;411 trace_afs_send_data(call, &msg);412 413 ret = rxrpc_kernel_send_data(call->net->socket,414 call->rxcall, &msg,415 iov_iter_count(&msg.msg_iter),416 afs_notify_end_request_tx);417 *call->write_iter = msg.msg_iter;418 419 trace_afs_sent_data(call, &msg, ret);420 if (ret < 0)421 goto error_do_abort;422 }423 424 /* Note that at this point, we may have received the reply or an abort425 * - and an asynchronous call may already have completed.426 *427 * afs_wait_for_call_to_complete(call)428 * must be called to synchronously clean up.429 */430 return;431 432error_do_abort:433 if (ret != -ECONNABORTED) {434 rxrpc_kernel_abort_call(call->net->socket, rxcall,435 RX_USER_ABORT, ret,436 afs_abort_send_data_error);437 } else {438 len = 0;439 iov_iter_kvec(&msg.msg_iter, ITER_DEST, NULL, 0, 0);440 rxrpc_kernel_recv_data(call->net->socket, rxcall,441 &msg.msg_iter, &len, false,442 &call->abort_code, &call->service_id);443 call->responded = true;444 }445 call->error = ret;446 trace_afs_call_done(call);447error_kill_call:448 if (call->type->done)449 call->type->done(call);450 451 /* We need to dispose of the extra ref we grabbed for an async call.452 * The call, however, might be queued on afs_async_calls and we need to453 * make sure we don't get any more notifications that might requeue it.454 */455 if (call->rxcall)456 rxrpc_kernel_shutdown_call(call->net->socket, call->rxcall);457 if (call->async) {458 if (cancel_work_sync(&call->async_work))459 afs_put_call(call);460 afs_set_call_complete(call, ret, 0);461 }462 463 call->error = ret;464 call->state = AFS_CALL_COMPLETE;465 _leave(" = %d", ret);466}467 468/*469 * Log remote abort codes that indicate that we have a protocol disagreement470 * with the server.471 */472static void afs_log_error(struct afs_call *call, s32 remote_abort)473{474 static int max = 0;475 const char *msg;476 int m;477 478 switch (remote_abort) {479 case RX_EOF: msg = "unexpected EOF"; break;480 case RXGEN_CC_MARSHAL: msg = "client marshalling"; break;481 case RXGEN_CC_UNMARSHAL: msg = "client unmarshalling"; break;482 case RXGEN_SS_MARSHAL: msg = "server marshalling"; break;483 case RXGEN_SS_UNMARSHAL: msg = "server unmarshalling"; break;484 case RXGEN_DECODE: msg = "opcode decode"; break;485 case RXGEN_SS_XDRFREE: msg = "server XDR cleanup"; break;486 case RXGEN_CC_XDRFREE: msg = "client XDR cleanup"; break;487 case -32: msg = "insufficient data"; break;488 default:489 return;490 }491 492 m = max;493 if (m < 3) {494 max = m + 1;495 pr_notice("kAFS: Peer reported %s failure on %s [%pISp]\n",496 msg, call->type->name,497 rxrpc_kernel_remote_addr(call->peer));498 }499}500 501/*502 * deliver messages to a call503 */504static void afs_deliver_to_call(struct afs_call *call)505{506 enum afs_call_state state;507 size_t len;508 u32 abort_code, remote_abort = 0;509 int ret;510 511 _enter("%s", call->type->name);512 513 while (state = READ_ONCE(call->state),514 state == AFS_CALL_CL_AWAIT_REPLY ||515 state == AFS_CALL_SV_AWAIT_OP_ID ||516 state == AFS_CALL_SV_AWAIT_REQUEST ||517 state == AFS_CALL_SV_AWAIT_ACK518 ) {519 if (state == AFS_CALL_SV_AWAIT_ACK) {520 len = 0;521 iov_iter_kvec(&call->def_iter, ITER_DEST, NULL, 0, 0);522 ret = rxrpc_kernel_recv_data(call->net->socket,523 call->rxcall, &call->def_iter,524 &len, false, &remote_abort,525 &call->service_id);526 trace_afs_receive_data(call, &call->def_iter, false, ret);527 528 if (ret == -EINPROGRESS || ret == -EAGAIN)529 return;530 if (ret < 0 || ret == 1) {531 if (ret == 1)532 ret = 0;533 goto call_complete;534 }535 return;536 }537 538 ret = call->type->deliver(call);539 state = READ_ONCE(call->state);540 if (ret == 0 && call->unmarshalling_error)541 ret = -EBADMSG;542 switch (ret) {543 case 0:544 call->responded = true;545 afs_queue_call_work(call);546 if (state == AFS_CALL_CL_PROC_REPLY) {547 if (call->op)548 set_bit(AFS_SERVER_FL_MAY_HAVE_CB,549 &call->op->server->flags);550 goto call_complete;551 }552 ASSERTCMP(state, >, AFS_CALL_CL_PROC_REPLY);553 goto done;554 case -EINPROGRESS:555 case -EAGAIN:556 goto out;557 case -ECONNABORTED:558 ASSERTCMP(state, ==, AFS_CALL_COMPLETE);559 call->responded = true;560 afs_log_error(call, call->abort_code);561 goto done;562 case -ENOTSUPP:563 call->responded = true;564 abort_code = RXGEN_OPCODE;565 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,566 abort_code, ret,567 afs_abort_op_not_supported);568 goto local_abort;569 case -EIO:570 pr_err("kAFS: Call %u in bad state %u\n",571 call->debug_id, state);572 fallthrough;573 case -ENODATA:574 case -EBADMSG:575 case -EMSGSIZE:576 case -ENOMEM:577 case -EFAULT:578 abort_code = RXGEN_CC_UNMARSHAL;579 if (state != AFS_CALL_CL_AWAIT_REPLY)580 abort_code = RXGEN_SS_UNMARSHAL;581 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,582 abort_code, ret,583 afs_abort_unmarshal_error);584 goto local_abort;585 default:586 abort_code = RX_CALL_DEAD;587 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,588 abort_code, ret,589 afs_abort_general_error);590 goto local_abort;591 }592 }593 594done:595 if (call->type->done)596 call->type->done(call);597out:598 _leave("");599 return;600 601local_abort:602 abort_code = 0;603call_complete:604 afs_set_call_complete(call, ret, remote_abort);605 state = AFS_CALL_COMPLETE;606 goto done;607}608 609/*610 * Wait synchronously for a call to complete.611 */612void afs_wait_for_call_to_complete(struct afs_call *call)613{614 bool rxrpc_complete = false;615 616 _enter("");617 618 if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {619 DECLARE_WAITQUEUE(myself, current);620 621 add_wait_queue(&call->waitq, &myself);622 for (;;) {623 set_current_state(TASK_UNINTERRUPTIBLE);624 625 /* deliver any messages that are in the queue */626 if (!afs_check_call_state(call, AFS_CALL_COMPLETE) &&627 call->need_attention) {628 call->need_attention = false;629 __set_current_state(TASK_RUNNING);630 afs_deliver_to_call(call);631 continue;632 }633 634 if (afs_check_call_state(call, AFS_CALL_COMPLETE))635 break;636 637 if (!rxrpc_kernel_check_life(call->net->socket, call->rxcall)) {638 /* rxrpc terminated the call. */639 rxrpc_complete = true;640 break;641 }642 643 schedule();644 }645 646 remove_wait_queue(&call->waitq, &myself);647 __set_current_state(TASK_RUNNING);648 }649 650 if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {651 if (rxrpc_complete) {652 afs_set_call_complete(call, call->error, call->abort_code);653 } else {654 /* Kill off the call if it's still live. */655 _debug("call interrupted");656 if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall,657 RX_USER_ABORT, -EINTR,658 afs_abort_interrupted))659 afs_set_call_complete(call, -EINTR, 0);660 }661 }662}663 664/*665 * wake up a waiting call666 */667static void afs_wake_up_call_waiter(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;671 672 call->need_attention = true;673 wake_up(&call->waitq);674}675 676/*677 * Wake up an asynchronous call. The caller is holding the call notify678 * spinlock around this, so we can't call afs_put_call().679 */680static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall,681 unsigned long call_user_ID)682{683 struct afs_call *call = (struct afs_call *)call_user_ID;684 int r;685 686 trace_afs_notify_call(rxcall, call);687 call->need_attention = true;688 689 if (__refcount_inc_not_zero(&call->ref, &r)) {690 trace_afs_call(call->debug_id, afs_call_trace_wake, r + 1,691 atomic_read(&call->net->nr_outstanding_calls),692 __builtin_return_address(0));693 694 if (!queue_work(afs_async_calls, &call->async_work))695 afs_deferred_put_call(call);696 }697}698 699/*700 * Perform I/O processing on an asynchronous call. The work item carries a ref701 * to the call struct that we either need to release or to pass on.702 */703static void afs_process_async_call(struct work_struct *work)704{705 struct afs_call *call = container_of(work, struct afs_call, async_work);706 707 _enter("");708 709 if (call->state < AFS_CALL_COMPLETE && call->need_attention) {710 call->need_attention = false;711 afs_deliver_to_call(call);712 }713 714 afs_put_call(call);715 _leave("");716}717 718static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID)719{720 struct afs_call *call = (struct afs_call *)user_call_ID;721 722 call->rxcall = rxcall;723}724 725/*726 * Charge the incoming call preallocation.727 */728void afs_charge_preallocation(struct work_struct *work)729{730 struct afs_net *net =731 container_of(work, struct afs_net, charge_preallocation_work);732 struct afs_call *call = net->spare_incoming_call;733 734 for (;;) {735 if (!call) {736 call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL);737 if (!call)738 break;739 740 call->drop_ref = true;741 call->async = true;742 call->state = AFS_CALL_SV_AWAIT_OP_ID;743 init_waitqueue_head(&call->waitq);744 afs_extract_to_tmp(call);745 }746 747 if (rxrpc_kernel_charge_accept(net->socket,748 afs_wake_up_async_call,749 afs_rx_attach,750 (unsigned long)call,751 GFP_KERNEL,752 call->debug_id) < 0)753 break;754 call = NULL;755 }756 net->spare_incoming_call = call;757}758 759/*760 * Discard a preallocated call when a socket is shut down.761 */762static void afs_rx_discard_new_call(struct rxrpc_call *rxcall,763 unsigned long user_call_ID)764{765 struct afs_call *call = (struct afs_call *)user_call_ID;766 767 call->rxcall = NULL;768 afs_put_call(call);769}770 771/*772 * Notification of an incoming call.773 */774static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall,775 unsigned long user_call_ID)776{777 struct afs_net *net = afs_sock2net(sk);778 779 queue_work(afs_wq, &net->charge_preallocation_work);780}781 782/*783 * Grab the operation ID from an incoming cache manager call. The socket784 * buffer is discarded on error or if we don't yet have sufficient data.785 */786static int afs_deliver_cm_op_id(struct afs_call *call)787{788 int ret;789 790 _enter("{%zu}", iov_iter_count(call->iter));791 792 /* the operation ID forms the first four bytes of the request data */793 ret = afs_extract_data(call, true);794 if (ret < 0)795 return ret;796 797 call->operation_ID = ntohl(call->tmp);798 afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST);799 800 /* ask the cache manager to route the call (it'll change the call type801 * if successful) */802 if (!afs_cm_incoming_call(call))803 return -ENOTSUPP;804 805 trace_afs_cb_call(call);806 807 /* pass responsibility for the remainer of this message off to the808 * cache manager op */809 return call->type->deliver(call);810}811 812/*813 * Advance the AFS call state when an RxRPC service call ends the transmit814 * phase.815 */816static void afs_notify_end_reply_tx(struct sock *sock,817 struct rxrpc_call *rxcall,818 unsigned long call_user_ID)819{820 struct afs_call *call = (struct afs_call *)call_user_ID;821 822 afs_set_call_state(call, AFS_CALL_SV_REPLYING, AFS_CALL_SV_AWAIT_ACK);823}824 825/*826 * send an empty reply827 */828void afs_send_empty_reply(struct afs_call *call)829{830 struct afs_net *net = call->net;831 struct msghdr msg;832 833 _enter("");834 835 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0);836 837 msg.msg_name = NULL;838 msg.msg_namelen = 0;839 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, NULL, 0, 0);840 msg.msg_control = NULL;841 msg.msg_controllen = 0;842 msg.msg_flags = 0;843 844 switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0,845 afs_notify_end_reply_tx)) {846 case 0:847 _leave(" [replied]");848 return;849 850 case -ENOMEM:851 _debug("oom");852 rxrpc_kernel_abort_call(net->socket, call->rxcall,853 RXGEN_SS_MARSHAL, -ENOMEM,854 afs_abort_oom);855 fallthrough;856 default:857 _leave(" [error]");858 return;859 }860}861 862/*863 * send a simple reply864 */865void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)866{867 struct afs_net *net = call->net;868 struct msghdr msg;869 struct kvec iov[1];870 int n;871 872 _enter("");873 874 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len);875 876 iov[0].iov_base = (void *) buf;877 iov[0].iov_len = len;878 msg.msg_name = NULL;879 msg.msg_namelen = 0;880 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, len);881 msg.msg_control = NULL;882 msg.msg_controllen = 0;883 msg.msg_flags = 0;884 885 n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len,886 afs_notify_end_reply_tx);887 if (n >= 0) {888 /* Success */889 _leave(" [replied]");890 return;891 }892 893 if (n == -ENOMEM) {894 _debug("oom");895 rxrpc_kernel_abort_call(net->socket, call->rxcall,896 RXGEN_SS_MARSHAL, -ENOMEM,897 afs_abort_oom);898 }899 _leave(" [error]");900}901 902/*903 * Extract a piece of data from the received data socket buffers.904 */905int afs_extract_data(struct afs_call *call, bool want_more)906{907 struct afs_net *net = call->net;908 struct iov_iter *iter = call->iter;909 enum afs_call_state state;910 u32 remote_abort = 0;911 int ret;912 913 _enter("{%s,%zu,%zu},%d",914 call->type->name, call->iov_len, iov_iter_count(iter), want_more);915 916 ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, iter,917 &call->iov_len, want_more, &remote_abort,918 &call->service_id);919 trace_afs_receive_data(call, call->iter, want_more, ret);920 if (ret == 0 || ret == -EAGAIN)921 return ret;922 923 state = READ_ONCE(call->state);924 if (ret == 1) {925 switch (state) {926 case AFS_CALL_CL_AWAIT_REPLY:927 afs_set_call_state(call, state, AFS_CALL_CL_PROC_REPLY);928 break;929 case AFS_CALL_SV_AWAIT_REQUEST:930 afs_set_call_state(call, state, AFS_CALL_SV_REPLYING);931 break;932 case AFS_CALL_COMPLETE:933 kdebug("prem complete %d", call->error);934 return afs_io_error(call, afs_io_error_extract);935 default:936 break;937 }938 return 0;939 }940 941 afs_set_call_complete(call, ret, remote_abort);942 return ret;943}944 945/*946 * Log protocol error production.947 */948noinline int afs_protocol_error(struct afs_call *call,949 enum afs_eproto_cause cause)950{951 trace_afs_protocol_error(call, cause);952 if (call)953 call->unmarshalling_error = true;954 return -EBADMSG;955}956