1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* AFS Cache Manager Service 3 * 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 17 static int afs_deliver_cb_init_call_back_state(struct afs_call *); 18 static int afs_deliver_cb_init_call_back_state3(struct afs_call *); 19 static int afs_deliver_cb_probe(struct afs_call *); 20 static int afs_deliver_cb_callback(struct afs_call *); 21 static int afs_deliver_cb_probe_uuid(struct afs_call *); 22 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *); 23 static void afs_cm_destructor(struct afs_call *); 24 static void SRXAFSCB_CallBack(struct work_struct *); 25 static void SRXAFSCB_InitCallBackState(struct work_struct *); 26 static void SRXAFSCB_Probe(struct work_struct *); 27 static void SRXAFSCB_ProbeUuid(struct work_struct *); 28 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *); 29 30 static int afs_deliver_yfs_cb_callback(struct afs_call *); 31 32 #define CM_NAME(name) \ 33 char afs_SRXCB##name##_name[] __tracepoint_string = \ 34 "CB." #name 35 36 /* 37 * CB.CallBack operation type 38 */ 39 static CM_NAME(CallBack); 40 static const struct afs_call_type afs_SRXCBCallBack = { 41 .name = afs_SRXCBCallBack_name, 42 .deliver = afs_deliver_cb_callback, 43 .destructor = afs_cm_destructor, 44 .work = SRXAFSCB_CallBack, 45 }; 46 47 /* 48 * CB.InitCallBackState operation type 49 */ 50 static CM_NAME(InitCallBackState); 51 static const struct afs_call_type afs_SRXCBInitCallBackState = { 52 .name = afs_SRXCBInitCallBackState_name, 53 .deliver = afs_deliver_cb_init_call_back_state, 54 .destructor = afs_cm_destructor, 55 .work = SRXAFSCB_InitCallBackState, 56 }; 57 58 /* 59 * CB.InitCallBackState3 operation type 60 */ 61 static CM_NAME(InitCallBackState3); 62 static const struct afs_call_type afs_SRXCBInitCallBackState3 = { 63 .name = afs_SRXCBInitCallBackState3_name, 64 .deliver = afs_deliver_cb_init_call_back_state3, 65 .destructor = afs_cm_destructor, 66 .work = SRXAFSCB_InitCallBackState, 67 }; 68 69 /* 70 * CB.Probe operation type 71 */ 72 static CM_NAME(Probe); 73 static const struct afs_call_type afs_SRXCBProbe = { 74 .name = afs_SRXCBProbe_name, 75 .deliver = afs_deliver_cb_probe, 76 .destructor = afs_cm_destructor, 77 .work = SRXAFSCB_Probe, 78 }; 79 80 /* 81 * CB.ProbeUuid operation type 82 */ 83 static CM_NAME(ProbeUuid); 84 static const struct afs_call_type afs_SRXCBProbeUuid = { 85 .name = afs_SRXCBProbeUuid_name, 86 .deliver = afs_deliver_cb_probe_uuid, 87 .destructor = afs_cm_destructor, 88 .work = SRXAFSCB_ProbeUuid, 89 }; 90 91 /* 92 * CB.TellMeAboutYourself operation type 93 */ 94 static CM_NAME(TellMeAboutYourself); 95 static const struct afs_call_type afs_SRXCBTellMeAboutYourself = { 96 .name = afs_SRXCBTellMeAboutYourself_name, 97 .deliver = afs_deliver_cb_tell_me_about_yourself, 98 .destructor = afs_cm_destructor, 99 .work = SRXAFSCB_TellMeAboutYourself, 100 }; 101 102 /* 103 * YFS CB.CallBack operation type 104 */ 105 static CM_NAME(YFS_CallBack); 106 static const struct afs_call_type afs_SRXYFSCB_CallBack = { 107 .name = afs_SRXCBYFS_CallBack_name, 108 .deliver = afs_deliver_yfs_cb_callback, 109 .destructor = afs_cm_destructor, 110 .work = SRXAFSCB_CallBack, 111 }; 112 113 /* 114 * route an incoming cache manager call 115 * - return T if supported, F if not 116 */ 117 bool afs_cm_incoming_call(struct afs_call *call) 118 { 119 _enter("{%u, CB.OP %u}", call->service_id, call->operation_ID); 120 121 call->epoch = rxrpc_kernel_get_epoch(call->net->socket, call->rxcall); 122 123 switch (call->operation_ID) { 124 case CBCallBack: 125 call->type = &afs_SRXCBCallBack; 126 return true; 127 case CBInitCallBackState: 128 call->type = &afs_SRXCBInitCallBackState; 129 return true; 130 case CBInitCallBackState3: 131 call->type = &afs_SRXCBInitCallBackState3; 132 return true; 133 case CBProbe: 134 call->type = &afs_SRXCBProbe; 135 return true; 136 case CBProbeUuid: 137 call->type = &afs_SRXCBProbeUuid; 138 return true; 139 case CBTellMeAboutYourself: 140 call->type = &afs_SRXCBTellMeAboutYourself; 141 return true; 142 case YFSCBCallBack: 143 if (call->service_id != YFS_CM_SERVICE) 144 return false; 145 call->type = &afs_SRXYFSCB_CallBack; 146 return true; 147 default: 148 return false; 149 } 150 } 151 152 /* 153 * Record a probe to the cache manager from a server. 154 */ 155 static int afs_record_cm_probe(struct afs_call *call, struct afs_server *server) 156 { 157 _enter(""); 158 159 if (test_bit(AFS_SERVER_FL_HAVE_EPOCH, &server->flags) && 160 !test_bit(AFS_SERVER_FL_PROBING, &server->flags)) { 161 if (server->cm_epoch == call->epoch) 162 return 0; 163 164 if (!server->probe.said_rebooted) { 165 pr_notice("kAFS: FS rebooted %pU\n", &server->uuid); 166 server->probe.said_rebooted = true; 167 } 168 } 169 170 spin_lock(&server->probe_lock); 171 172 if (!test_bit(AFS_SERVER_FL_HAVE_EPOCH, &server->flags)) { 173 server->cm_epoch = call->epoch; 174 server->probe.cm_epoch = call->epoch; 175 goto out; 176 } 177 178 if (server->probe.cm_probed && 179 call->epoch != server->probe.cm_epoch && 180 !server->probe.said_inconsistent) { 181 pr_notice("kAFS: FS endpoints inconsistent %pU\n", 182 &server->uuid); 183 server->probe.said_inconsistent = true; 184 } 185 186 if (!server->probe.cm_probed || call->epoch == server->cm_epoch) 187 server->probe.cm_epoch = server->cm_epoch; 188 189 out: 190 server->probe.cm_probed = true; 191 spin_unlock(&server->probe_lock); 192 return 0; 193 } 194 195 /* 196 * Find the server record by peer address and record a probe to the cache 197 * manager from a server. 198 */ 199 static int afs_find_cm_server_by_peer(struct afs_call *call) 200 { 201 struct sockaddr_rxrpc srx; 202 struct afs_server *server; 203 204 rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx); 205 206 server = afs_find_server(call->net, &srx); 207 if (!server) { 208 trace_afs_cm_no_server(call, &srx); 209 return 0; 210 } 211 212 call->server = server; 213 return afs_record_cm_probe(call, server); 214 } 215 216 /* 217 * Find the server record by server UUID and record a probe to the cache 218 * manager from a server. 219 */ 220 static int afs_find_cm_server_by_uuid(struct afs_call *call, 221 struct afs_uuid *uuid) 222 { 223 struct afs_server *server; 224 225 rcu_read_lock(); 226 server = afs_find_server_by_uuid(call->net, call->request); 227 rcu_read_unlock(); 228 if (!server) { 229 trace_afs_cm_no_server_u(call, call->request); 230 return 0; 231 } 232 233 call->server = server; 234 return afs_record_cm_probe(call, server); 235 } 236 237 /* 238 * Clean up a cache manager call. 239 */ 240 static void afs_cm_destructor(struct afs_call *call) 241 { 242 kfree(call->buffer); 243 call->buffer = NULL; 244 } 245 246 /* 247 * The server supplied a list of callbacks that it wanted to break. 248 */ 249 static void SRXAFSCB_CallBack(struct work_struct *work) 250 { 251 struct afs_call *call = container_of(work, struct afs_call, work); 252 253 _enter(""); 254 255 /* We need to break the callbacks before sending the reply as the 256 * server holds up change visibility till it receives our reply so as 257 * to maintain cache coherency. 258 */ 259 if (call->server) { 260 trace_afs_server(call->server, atomic_read(&call->server->usage), 261 afs_server_trace_callback); 262 afs_break_callbacks(call->server, call->count, call->request); 263 } 264 265 afs_send_empty_reply(call); 266 afs_put_call(call); 267 _leave(""); 268 } 269 270 /* 271 * deliver request data to a CB.CallBack call 272 */ 273 static int afs_deliver_cb_callback(struct afs_call *call) 274 { 275 struct afs_callback_break *cb; 276 __be32 *bp; 277 int ret, loop; 278 279 _enter("{%u}", call->unmarshall); 280 281 switch (call->unmarshall) { 282 case 0: 283 afs_extract_to_tmp(call); 284 call->unmarshall++; 285 286 /* extract the FID array and its count in two steps */ 287 /* fall through */ 288 case 1: 289 _debug("extract FID count"); 290 ret = afs_extract_data(call, true); 291 if (ret < 0) 292 return ret; 293 294 call->count = ntohl(call->tmp); 295 _debug("FID count: %u", call->count); 296 if (call->count > AFSCBMAX) 297 return afs_protocol_error(call, -EBADMSG, 298 afs_eproto_cb_fid_count); 299 300 call->buffer = kmalloc(array3_size(call->count, 3, 4), 301 GFP_KERNEL); 302 if (!call->buffer) 303 return -ENOMEM; 304 afs_extract_to_buf(call, call->count * 3 * 4); 305 call->unmarshall++; 306 307 /* Fall through */ 308 case 2: 309 _debug("extract FID array"); 310 ret = afs_extract_data(call, true); 311 if (ret < 0) 312 return ret; 313 314 _debug("unmarshall FID array"); 315 call->request = kcalloc(call->count, 316 sizeof(struct afs_callback_break), 317 GFP_KERNEL); 318 if (!call->request) 319 return -ENOMEM; 320 321 cb = call->request; 322 bp = call->buffer; 323 for (loop = call->count; loop > 0; loop--, cb++) { 324 cb->fid.vid = ntohl(*bp++); 325 cb->fid.vnode = ntohl(*bp++); 326 cb->fid.unique = ntohl(*bp++); 327 } 328 329 afs_extract_to_tmp(call); 330 call->unmarshall++; 331 332 /* extract the callback array and its count in two steps */ 333 /* fall through */ 334 case 3: 335 _debug("extract CB count"); 336 ret = afs_extract_data(call, true); 337 if (ret < 0) 338 return ret; 339 340 call->count2 = ntohl(call->tmp); 341 _debug("CB count: %u", call->count2); 342 if (call->count2 != call->count && call->count2 != 0) 343 return afs_protocol_error(call, -EBADMSG, 344 afs_eproto_cb_count); 345 call->_iter = &call->iter; 346 iov_iter_discard(&call->iter, READ, call->count2 * 3 * 4); 347 call->unmarshall++; 348 349 /* Fall through */ 350 case 4: 351 _debug("extract discard %zu/%u", 352 iov_iter_count(&call->iter), call->count2 * 3 * 4); 353 354 ret = afs_extract_data(call, false); 355 if (ret < 0) 356 return ret; 357 358 call->unmarshall++; 359 case 5: 360 break; 361 } 362 363 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING)) 364 return afs_io_error(call, afs_io_error_cm_reply); 365 366 /* we'll need the file server record as that tells us which set of 367 * vnodes to operate upon */ 368 return afs_find_cm_server_by_peer(call); 369 } 370 371 /* 372 * allow the fileserver to request callback state (re-)initialisation 373 */ 374 static void SRXAFSCB_InitCallBackState(struct work_struct *work) 375 { 376 struct afs_call *call = container_of(work, struct afs_call, work); 377 378 _enter("{%p}", call->server); 379 380 if (call->server) 381 afs_init_callback_state(call->server); 382 afs_send_empty_reply(call); 383 afs_put_call(call); 384 _leave(""); 385 } 386 387 /* 388 * deliver request data to a CB.InitCallBackState call 389 */ 390 static int afs_deliver_cb_init_call_back_state(struct afs_call *call) 391 { 392 int ret; 393 394 _enter(""); 395 396 afs_extract_discard(call, 0); 397 ret = afs_extract_data(call, false); 398 if (ret < 0) 399 return ret; 400 401 /* we'll need the file server record as that tells us which set of 402 * vnodes to operate upon */ 403 return afs_find_cm_server_by_peer(call); 404 } 405 406 /* 407 * deliver request data to a CB.InitCallBackState3 call 408 */ 409 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call) 410 { 411 struct afs_uuid *r; 412 unsigned loop; 413 __be32 *b; 414 int ret; 415 416 _enter(""); 417 418 _enter("{%u}", call->unmarshall); 419 420 switch (call->unmarshall) { 421 case 0: 422 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL); 423 if (!call->buffer) 424 return -ENOMEM; 425 afs_extract_to_buf(call, 11 * sizeof(__be32)); 426 call->unmarshall++; 427 428 /* Fall through */ 429 case 1: 430 _debug("extract UUID"); 431 ret = afs_extract_data(call, false); 432 switch (ret) { 433 case 0: break; 434 case -EAGAIN: return 0; 435 default: return ret; 436 } 437 438 _debug("unmarshall UUID"); 439 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL); 440 if (!call->request) 441 return -ENOMEM; 442 443 b = call->buffer; 444 r = call->request; 445 r->time_low = b[0]; 446 r->time_mid = htons(ntohl(b[1])); 447 r->time_hi_and_version = htons(ntohl(b[2])); 448 r->clock_seq_hi_and_reserved = ntohl(b[3]); 449 r->clock_seq_low = ntohl(b[4]); 450 451 for (loop = 0; loop < 6; loop++) 452 r->node[loop] = ntohl(b[loop + 5]); 453 454 call->unmarshall++; 455 456 case 2: 457 break; 458 } 459 460 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING)) 461 return afs_io_error(call, afs_io_error_cm_reply); 462 463 /* we'll need the file server record as that tells us which set of 464 * vnodes to operate upon */ 465 return afs_find_cm_server_by_uuid(call, call->request); 466 } 467 468 /* 469 * allow the fileserver to see if the cache manager is still alive 470 */ 471 static void SRXAFSCB_Probe(struct work_struct *work) 472 { 473 struct afs_call *call = container_of(work, struct afs_call, work); 474 475 _enter(""); 476 afs_send_empty_reply(call); 477 afs_put_call(call); 478 _leave(""); 479 } 480 481 /* 482 * deliver request data to a CB.Probe call 483 */ 484 static int afs_deliver_cb_probe(struct afs_call *call) 485 { 486 int ret; 487 488 _enter(""); 489 490 afs_extract_discard(call, 0); 491 ret = afs_extract_data(call, false); 492 if (ret < 0) 493 return ret; 494 495 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING)) 496 return afs_io_error(call, afs_io_error_cm_reply); 497 return afs_find_cm_server_by_peer(call); 498 } 499 500 /* 501 * allow the fileserver to quickly find out if the fileserver has been rebooted 502 */ 503 static void SRXAFSCB_ProbeUuid(struct work_struct *work) 504 { 505 struct afs_call *call = container_of(work, struct afs_call, work); 506 struct afs_uuid *r = call->request; 507 508 struct { 509 __be32 match; 510 } reply; 511 512 _enter(""); 513 514 if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0) 515 reply.match = htonl(0); 516 else 517 reply.match = htonl(1); 518 519 afs_send_simple_reply(call, &reply, sizeof(reply)); 520 afs_put_call(call); 521 _leave(""); 522 } 523 524 /* 525 * deliver request data to a CB.ProbeUuid call 526 */ 527 static int afs_deliver_cb_probe_uuid(struct afs_call *call) 528 { 529 struct afs_uuid *r; 530 unsigned loop; 531 __be32 *b; 532 int ret; 533 534 _enter("{%u}", call->unmarshall); 535 536 switch (call->unmarshall) { 537 case 0: 538 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL); 539 if (!call->buffer) 540 return -ENOMEM; 541 afs_extract_to_buf(call, 11 * sizeof(__be32)); 542 call->unmarshall++; 543 544 /* Fall through */ 545 case 1: 546 _debug("extract UUID"); 547 ret = afs_extract_data(call, false); 548 switch (ret) { 549 case 0: break; 550 case -EAGAIN: return 0; 551 default: return ret; 552 } 553 554 _debug("unmarshall UUID"); 555 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL); 556 if (!call->request) 557 return -ENOMEM; 558 559 b = call->buffer; 560 r = call->request; 561 r->time_low = b[0]; 562 r->time_mid = htons(ntohl(b[1])); 563 r->time_hi_and_version = htons(ntohl(b[2])); 564 r->clock_seq_hi_and_reserved = ntohl(b[3]); 565 r->clock_seq_low = ntohl(b[4]); 566 567 for (loop = 0; loop < 6; loop++) 568 r->node[loop] = ntohl(b[loop + 5]); 569 570 call->unmarshall++; 571 572 case 2: 573 break; 574 } 575 576 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING)) 577 return afs_io_error(call, afs_io_error_cm_reply); 578 return afs_find_cm_server_by_uuid(call, call->request); 579 } 580 581 /* 582 * allow the fileserver to ask about the cache manager's capabilities 583 */ 584 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work) 585 { 586 struct afs_call *call = container_of(work, struct afs_call, work); 587 int loop; 588 589 struct { 590 struct /* InterfaceAddr */ { 591 __be32 nifs; 592 __be32 uuid[11]; 593 __be32 ifaddr[32]; 594 __be32 netmask[32]; 595 __be32 mtu[32]; 596 } ia; 597 struct /* Capabilities */ { 598 __be32 capcount; 599 __be32 caps[1]; 600 } cap; 601 } reply; 602 603 _enter(""); 604 605 memset(&reply, 0, sizeof(reply)); 606 607 reply.ia.uuid[0] = call->net->uuid.time_low; 608 reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid)); 609 reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version)); 610 reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved); 611 reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low); 612 for (loop = 0; loop < 6; loop++) 613 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]); 614 615 reply.cap.capcount = htonl(1); 616 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION); 617 afs_send_simple_reply(call, &reply, sizeof(reply)); 618 afs_put_call(call); 619 _leave(""); 620 } 621 622 /* 623 * deliver request data to a CB.TellMeAboutYourself call 624 */ 625 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call) 626 { 627 int ret; 628 629 _enter(""); 630 631 afs_extract_discard(call, 0); 632 ret = afs_extract_data(call, false); 633 if (ret < 0) 634 return ret; 635 636 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING)) 637 return afs_io_error(call, afs_io_error_cm_reply); 638 return afs_find_cm_server_by_peer(call); 639 } 640 641 /* 642 * deliver request data to a YFS CB.CallBack call 643 */ 644 static int afs_deliver_yfs_cb_callback(struct afs_call *call) 645 { 646 struct afs_callback_break *cb; 647 struct yfs_xdr_YFSFid *bp; 648 size_t size; 649 int ret, loop; 650 651 _enter("{%u}", call->unmarshall); 652 653 switch (call->unmarshall) { 654 case 0: 655 afs_extract_to_tmp(call); 656 call->unmarshall++; 657 658 /* extract the FID array and its count in two steps */ 659 /* Fall through */ 660 case 1: 661 _debug("extract FID count"); 662 ret = afs_extract_data(call, true); 663 if (ret < 0) 664 return ret; 665 666 call->count = ntohl(call->tmp); 667 _debug("FID count: %u", call->count); 668 if (call->count > YFSCBMAX) 669 return afs_protocol_error(call, -EBADMSG, 670 afs_eproto_cb_fid_count); 671 672 size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid)); 673 call->buffer = kmalloc(size, GFP_KERNEL); 674 if (!call->buffer) 675 return -ENOMEM; 676 afs_extract_to_buf(call, size); 677 call->unmarshall++; 678 679 /* Fall through */ 680 case 2: 681 _debug("extract FID array"); 682 ret = afs_extract_data(call, false); 683 if (ret < 0) 684 return ret; 685 686 _debug("unmarshall FID array"); 687 call->request = kcalloc(call->count, 688 sizeof(struct afs_callback_break), 689 GFP_KERNEL); 690 if (!call->request) 691 return -ENOMEM; 692 693 cb = call->request; 694 bp = call->buffer; 695 for (loop = call->count; loop > 0; loop--, cb++) { 696 cb->fid.vid = xdr_to_u64(bp->volume); 697 cb->fid.vnode = xdr_to_u64(bp->vnode.lo); 698 cb->fid.vnode_hi = ntohl(bp->vnode.hi); 699 cb->fid.unique = ntohl(bp->vnode.unique); 700 bp++; 701 } 702 703 afs_extract_to_tmp(call); 704 call->unmarshall++; 705 706 case 3: 707 break; 708 } 709 710 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING)) 711 return afs_io_error(call, afs_io_error_cm_reply); 712 713 /* We'll need the file server record as that tells us which set of 714 * vnodes to operate upon. 715 */ 716 return afs_find_cm_server_by_peer(call); 717 } 718