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1// SPDX-License-Identifier: GPL-2.0-or-later2/* AFS Cache Manager Service3 *4 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.5 * Written by David Howells (dhowells@redhat.com)6 */7 8#include <linux/module.h>9#include <linux/init.h>10#include <linux/slab.h>11#include <linux/sched.h>12#include <linux/ip.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 19static int afs_deliver_cb_init_call_back_state(struct afs_call *);20static int afs_deliver_cb_init_call_back_state3(struct afs_call *);21static int afs_deliver_cb_probe(struct afs_call *);22static int afs_deliver_cb_callback(struct afs_call *);23static int afs_deliver_cb_probe_uuid(struct afs_call *);24static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);25static void afs_cm_destructor(struct afs_call *);26static void SRXAFSCB_CallBack(struct work_struct *);27static void SRXAFSCB_InitCallBackState(struct work_struct *);28static void SRXAFSCB_Probe(struct work_struct *);29static void SRXAFSCB_ProbeUuid(struct work_struct *);30static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);31 32static int afs_deliver_yfs_cb_callback(struct afs_call *);33 34/*35 * CB.CallBack operation type36 */37static const struct afs_call_type afs_SRXCBCallBack = {38 .name = "CB.CallBack",39 .deliver = afs_deliver_cb_callback,40 .destructor = afs_cm_destructor,41 .work = SRXAFSCB_CallBack,42};43 44/*45 * CB.InitCallBackState operation type46 */47static const struct afs_call_type afs_SRXCBInitCallBackState = {48 .name = "CB.InitCallBackState",49 .deliver = afs_deliver_cb_init_call_back_state,50 .destructor = afs_cm_destructor,51 .work = SRXAFSCB_InitCallBackState,52};53 54/*55 * CB.InitCallBackState3 operation type56 */57static const struct afs_call_type afs_SRXCBInitCallBackState3 = {58 .name = "CB.InitCallBackState3",59 .deliver = afs_deliver_cb_init_call_back_state3,60 .destructor = afs_cm_destructor,61 .work = SRXAFSCB_InitCallBackState,62};63 64/*65 * CB.Probe operation type66 */67static const struct afs_call_type afs_SRXCBProbe = {68 .name = "CB.Probe",69 .deliver = afs_deliver_cb_probe,70 .destructor = afs_cm_destructor,71 .work = SRXAFSCB_Probe,72};73 74/*75 * CB.ProbeUuid operation type76 */77static const struct afs_call_type afs_SRXCBProbeUuid = {78 .name = "CB.ProbeUuid",79 .deliver = afs_deliver_cb_probe_uuid,80 .destructor = afs_cm_destructor,81 .work = SRXAFSCB_ProbeUuid,82};83 84/*85 * CB.TellMeAboutYourself operation type86 */87static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {88 .name = "CB.TellMeAboutYourself",89 .deliver = afs_deliver_cb_tell_me_about_yourself,90 .destructor = afs_cm_destructor,91 .work = SRXAFSCB_TellMeAboutYourself,92};93 94/*95 * YFS CB.CallBack operation type96 */97static const struct afs_call_type afs_SRXYFSCB_CallBack = {98 .name = "YFSCB.CallBack",99 .deliver = afs_deliver_yfs_cb_callback,100 .destructor = afs_cm_destructor,101 .work = SRXAFSCB_CallBack,102};103 104/*105 * route an incoming cache manager call106 * - return T if supported, F if not107 */108bool afs_cm_incoming_call(struct afs_call *call)109{110 _enter("{%u, CB.OP %u}", call->service_id, call->operation_ID);111 112 switch (call->operation_ID) {113 case CBCallBack:114 call->type = &afs_SRXCBCallBack;115 return true;116 case CBInitCallBackState:117 call->type = &afs_SRXCBInitCallBackState;118 return true;119 case CBInitCallBackState3:120 call->type = &afs_SRXCBInitCallBackState3;121 return true;122 case CBProbe:123 call->type = &afs_SRXCBProbe;124 return true;125 case CBProbeUuid:126 call->type = &afs_SRXCBProbeUuid;127 return true;128 case CBTellMeAboutYourself:129 call->type = &afs_SRXCBTellMeAboutYourself;130 return true;131 case YFSCBCallBack:132 if (call->service_id != YFS_CM_SERVICE)133 return false;134 call->type = &afs_SRXYFSCB_CallBack;135 return true;136 default:137 return false;138 }139}140 141/*142 * Find the server record by peer address and record a probe to the cache143 * manager from a server.144 */145static int afs_find_cm_server_by_peer(struct afs_call *call)146{147 struct sockaddr_rxrpc srx;148 struct afs_server *server;149 struct rxrpc_peer *peer;150 151 peer = rxrpc_kernel_get_call_peer(call->net->socket, call->rxcall);152 153 server = afs_find_server(call->net, peer);154 if (!server) {155 trace_afs_cm_no_server(call, &srx);156 return 0;157 }158 159 call->server = server;160 return 0;161}162 163/*164 * Find the server record by server UUID and record a probe to the cache165 * manager from a server.166 */167static int afs_find_cm_server_by_uuid(struct afs_call *call,168 struct afs_uuid *uuid)169{170 struct afs_server *server;171 172 rcu_read_lock();173 server = afs_find_server_by_uuid(call->net, call->request);174 rcu_read_unlock();175 if (!server) {176 trace_afs_cm_no_server_u(call, call->request);177 return 0;178 }179 180 call->server = server;181 return 0;182}183 184/*185 * Clean up a cache manager call.186 */187static void afs_cm_destructor(struct afs_call *call)188{189 kfree(call->buffer);190 call->buffer = NULL;191}192 193/*194 * Abort a service call from within an action function.195 */196static void afs_abort_service_call(struct afs_call *call, u32 abort_code, int error,197 enum rxrpc_abort_reason why)198{199 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,200 abort_code, error, why);201 afs_set_call_complete(call, error, 0);202}203 204/*205 * The server supplied a list of callbacks that it wanted to break.206 */207static void SRXAFSCB_CallBack(struct work_struct *work)208{209 struct afs_call *call = container_of(work, struct afs_call, work);210 211 _enter("");212 213 /* We need to break the callbacks before sending the reply as the214 * server holds up change visibility till it receives our reply so as215 * to maintain cache coherency.216 */217 if (call->server) {218 trace_afs_server(call->server->debug_id,219 refcount_read(&call->server->ref),220 atomic_read(&call->server->active),221 afs_server_trace_callback);222 afs_break_callbacks(call->server, call->count, call->request);223 }224 225 afs_send_empty_reply(call);226 afs_put_call(call);227 _leave("");228}229 230/*231 * deliver request data to a CB.CallBack call232 */233static int afs_deliver_cb_callback(struct afs_call *call)234{235 struct afs_callback_break *cb;236 __be32 *bp;237 int ret, loop;238 239 _enter("{%u}", call->unmarshall);240 241 switch (call->unmarshall) {242 case 0:243 afs_extract_to_tmp(call);244 call->unmarshall++;245 246 /* extract the FID array and its count in two steps */247 fallthrough;248 case 1:249 _debug("extract FID count");250 ret = afs_extract_data(call, true);251 if (ret < 0)252 return ret;253 254 call->count = ntohl(call->tmp);255 _debug("FID count: %u", call->count);256 if (call->count > AFSCBMAX)257 return afs_protocol_error(call, afs_eproto_cb_fid_count);258 259 call->buffer = kmalloc(array3_size(call->count, 3, 4),260 GFP_KERNEL);261 if (!call->buffer)262 return -ENOMEM;263 afs_extract_to_buf(call, call->count * 3 * 4);264 call->unmarshall++;265 266 fallthrough;267 case 2:268 _debug("extract FID array");269 ret = afs_extract_data(call, true);270 if (ret < 0)271 return ret;272 273 _debug("unmarshall FID array");274 call->request = kcalloc(call->count,275 sizeof(struct afs_callback_break),276 GFP_KERNEL);277 if (!call->request)278 return -ENOMEM;279 280 cb = call->request;281 bp = call->buffer;282 for (loop = call->count; loop > 0; loop--, cb++) {283 cb->fid.vid = ntohl(*bp++);284 cb->fid.vnode = ntohl(*bp++);285 cb->fid.unique = ntohl(*bp++);286 }287 288 afs_extract_to_tmp(call);289 call->unmarshall++;290 291 /* extract the callback array and its count in two steps */292 fallthrough;293 case 3:294 _debug("extract CB count");295 ret = afs_extract_data(call, true);296 if (ret < 0)297 return ret;298 299 call->count2 = ntohl(call->tmp);300 _debug("CB count: %u", call->count2);301 if (call->count2 != call->count && call->count2 != 0)302 return afs_protocol_error(call, afs_eproto_cb_count);303 call->iter = &call->def_iter;304 iov_iter_discard(&call->def_iter, ITER_DEST, call->count2 * 3 * 4);305 call->unmarshall++;306 307 fallthrough;308 case 4:309 _debug("extract discard %zu/%u",310 iov_iter_count(call->iter), call->count2 * 3 * 4);311 312 ret = afs_extract_data(call, false);313 if (ret < 0)314 return ret;315 316 call->unmarshall++;317 fallthrough;318 319 case 5:320 break;321 }322 323 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))324 return afs_io_error(call, afs_io_error_cm_reply);325 326 /* we'll need the file server record as that tells us which set of327 * vnodes to operate upon */328 return afs_find_cm_server_by_peer(call);329}330 331/*332 * allow the fileserver to request callback state (re-)initialisation333 */334static void SRXAFSCB_InitCallBackState(struct work_struct *work)335{336 struct afs_call *call = container_of(work, struct afs_call, work);337 338 _enter("{%p}", call->server);339 340 if (call->server)341 afs_init_callback_state(call->server);342 afs_send_empty_reply(call);343 afs_put_call(call);344 _leave("");345}346 347/*348 * deliver request data to a CB.InitCallBackState call349 */350static int afs_deliver_cb_init_call_back_state(struct afs_call *call)351{352 int ret;353 354 _enter("");355 356 afs_extract_discard(call, 0);357 ret = afs_extract_data(call, false);358 if (ret < 0)359 return ret;360 361 /* we'll need the file server record as that tells us which set of362 * vnodes to operate upon */363 return afs_find_cm_server_by_peer(call);364}365 366/*367 * deliver request data to a CB.InitCallBackState3 call368 */369static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)370{371 struct afs_uuid *r;372 unsigned loop;373 __be32 *b;374 int ret;375 376 _enter("");377 378 _enter("{%u}", call->unmarshall);379 380 switch (call->unmarshall) {381 case 0:382 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);383 if (!call->buffer)384 return -ENOMEM;385 afs_extract_to_buf(call, 11 * sizeof(__be32));386 call->unmarshall++;387 388 fallthrough;389 case 1:390 _debug("extract UUID");391 ret = afs_extract_data(call, false);392 switch (ret) {393 case 0: break;394 case -EAGAIN: return 0;395 default: return ret;396 }397 398 _debug("unmarshall UUID");399 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);400 if (!call->request)401 return -ENOMEM;402 403 b = call->buffer;404 r = call->request;405 r->time_low = b[0];406 r->time_mid = htons(ntohl(b[1]));407 r->time_hi_and_version = htons(ntohl(b[2]));408 r->clock_seq_hi_and_reserved = ntohl(b[3]);409 r->clock_seq_low = ntohl(b[4]);410 411 for (loop = 0; loop < 6; loop++)412 r->node[loop] = ntohl(b[loop + 5]);413 414 call->unmarshall++;415 fallthrough;416 417 case 2:418 break;419 }420 421 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))422 return afs_io_error(call, afs_io_error_cm_reply);423 424 /* we'll need the file server record as that tells us which set of425 * vnodes to operate upon */426 return afs_find_cm_server_by_uuid(call, call->request);427}428 429/*430 * allow the fileserver to see if the cache manager is still alive431 */432static void SRXAFSCB_Probe(struct work_struct *work)433{434 struct afs_call *call = container_of(work, struct afs_call, work);435 436 _enter("");437 afs_send_empty_reply(call);438 afs_put_call(call);439 _leave("");440}441 442/*443 * deliver request data to a CB.Probe call444 */445static int afs_deliver_cb_probe(struct afs_call *call)446{447 int ret;448 449 _enter("");450 451 afs_extract_discard(call, 0);452 ret = afs_extract_data(call, false);453 if (ret < 0)454 return ret;455 456 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))457 return afs_io_error(call, afs_io_error_cm_reply);458 return afs_find_cm_server_by_peer(call);459}460 461/*462 * Allow the fileserver to quickly find out if the cache manager has been463 * rebooted.464 */465static void SRXAFSCB_ProbeUuid(struct work_struct *work)466{467 struct afs_call *call = container_of(work, struct afs_call, work);468 struct afs_uuid *r = call->request;469 470 _enter("");471 472 if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)473 afs_send_empty_reply(call);474 else475 afs_abort_service_call(call, 1, 1, afs_abort_probeuuid_negative);476 477 afs_put_call(call);478 _leave("");479}480 481/*482 * deliver request data to a CB.ProbeUuid call483 */484static int afs_deliver_cb_probe_uuid(struct afs_call *call)485{486 struct afs_uuid *r;487 unsigned loop;488 __be32 *b;489 int ret;490 491 _enter("{%u}", call->unmarshall);492 493 switch (call->unmarshall) {494 case 0:495 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);496 if (!call->buffer)497 return -ENOMEM;498 afs_extract_to_buf(call, 11 * sizeof(__be32));499 call->unmarshall++;500 501 fallthrough;502 case 1:503 _debug("extract UUID");504 ret = afs_extract_data(call, false);505 switch (ret) {506 case 0: break;507 case -EAGAIN: return 0;508 default: return ret;509 }510 511 _debug("unmarshall UUID");512 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);513 if (!call->request)514 return -ENOMEM;515 516 b = call->buffer;517 r = call->request;518 r->time_low = b[0];519 r->time_mid = htons(ntohl(b[1]));520 r->time_hi_and_version = htons(ntohl(b[2]));521 r->clock_seq_hi_and_reserved = ntohl(b[3]);522 r->clock_seq_low = ntohl(b[4]);523 524 for (loop = 0; loop < 6; loop++)525 r->node[loop] = ntohl(b[loop + 5]);526 527 call->unmarshall++;528 fallthrough;529 530 case 2:531 break;532 }533 534 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))535 return afs_io_error(call, afs_io_error_cm_reply);536 return afs_find_cm_server_by_peer(call);537}538 539/*540 * allow the fileserver to ask about the cache manager's capabilities541 */542static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)543{544 struct afs_call *call = container_of(work, struct afs_call, work);545 int loop;546 547 struct {548 struct /* InterfaceAddr */ {549 __be32 nifs;550 __be32 uuid[11];551 __be32 ifaddr[32];552 __be32 netmask[32];553 __be32 mtu[32];554 } ia;555 struct /* Capabilities */ {556 __be32 capcount;557 __be32 caps[1];558 } cap;559 } reply;560 561 _enter("");562 563 memset(&reply, 0, sizeof(reply));564 565 reply.ia.uuid[0] = call->net->uuid.time_low;566 reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));567 reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));568 reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);569 reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);570 for (loop = 0; loop < 6; loop++)571 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);572 573 reply.cap.capcount = htonl(1);574 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);575 afs_send_simple_reply(call, &reply, sizeof(reply));576 afs_put_call(call);577 _leave("");578}579 580/*581 * deliver request data to a CB.TellMeAboutYourself call582 */583static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)584{585 int ret;586 587 _enter("");588 589 afs_extract_discard(call, 0);590 ret = afs_extract_data(call, false);591 if (ret < 0)592 return ret;593 594 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))595 return afs_io_error(call, afs_io_error_cm_reply);596 return afs_find_cm_server_by_peer(call);597}598 599/*600 * deliver request data to a YFS CB.CallBack call601 */602static int afs_deliver_yfs_cb_callback(struct afs_call *call)603{604 struct afs_callback_break *cb;605 struct yfs_xdr_YFSFid *bp;606 size_t size;607 int ret, loop;608 609 _enter("{%u}", call->unmarshall);610 611 switch (call->unmarshall) {612 case 0:613 afs_extract_to_tmp(call);614 call->unmarshall++;615 616 /* extract the FID array and its count in two steps */617 fallthrough;618 case 1:619 _debug("extract FID count");620 ret = afs_extract_data(call, true);621 if (ret < 0)622 return ret;623 624 call->count = ntohl(call->tmp);625 _debug("FID count: %u", call->count);626 if (call->count > YFSCBMAX)627 return afs_protocol_error(call, afs_eproto_cb_fid_count);628 629 size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));630 call->buffer = kmalloc(size, GFP_KERNEL);631 if (!call->buffer)632 return -ENOMEM;633 afs_extract_to_buf(call, size);634 call->unmarshall++;635 636 fallthrough;637 case 2:638 _debug("extract FID array");639 ret = afs_extract_data(call, false);640 if (ret < 0)641 return ret;642 643 _debug("unmarshall FID array");644 call->request = kcalloc(call->count,645 sizeof(struct afs_callback_break),646 GFP_KERNEL);647 if (!call->request)648 return -ENOMEM;649 650 cb = call->request;651 bp = call->buffer;652 for (loop = call->count; loop > 0; loop--, cb++) {653 cb->fid.vid = xdr_to_u64(bp->volume);654 cb->fid.vnode = xdr_to_u64(bp->vnode.lo);655 cb->fid.vnode_hi = ntohl(bp->vnode.hi);656 cb->fid.unique = ntohl(bp->vnode.unique);657 bp++;658 }659 660 afs_extract_to_tmp(call);661 call->unmarshall++;662 fallthrough;663 664 case 3:665 break;666 }667 668 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))669 return afs_io_error(call, afs_io_error_cm_reply);670 671 /* We'll need the file server record as that tells us which set of672 * vnodes to operate upon.673 */674 return afs_find_cm_server_by_peer(call);675}676