1 /* AFS Volume Location Service client 2 * 3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/gfp.h> 13 #include <linux/init.h> 14 #include <linux/sched.h> 15 #include "afs_fs.h" 16 #include "internal.h" 17 18 /* 19 * Deliver reply data to a VL.GetEntryByNameU call. 20 */ 21 static int afs_deliver_vl_get_entry_by_name_u(struct afs_call *call) 22 { 23 struct afs_uvldbentry__xdr *uvldb; 24 struct afs_vldb_entry *entry; 25 bool new_only = false; 26 u32 tmp, nr_servers, vlflags; 27 int i, ret; 28 29 _enter(""); 30 31 ret = afs_transfer_reply(call); 32 if (ret < 0) 33 return ret; 34 35 /* unmarshall the reply once we've received all of it */ 36 uvldb = call->buffer; 37 entry = call->ret_vldb; 38 39 nr_servers = ntohl(uvldb->nServers); 40 if (nr_servers > AFS_NMAXNSERVERS) 41 nr_servers = AFS_NMAXNSERVERS; 42 43 for (i = 0; i < ARRAY_SIZE(uvldb->name) - 1; i++) 44 entry->name[i] = (u8)ntohl(uvldb->name[i]); 45 entry->name[i] = 0; 46 entry->name_len = strlen(entry->name); 47 48 /* If there is a new replication site that we can use, ignore all the 49 * sites that aren't marked as new. 50 */ 51 for (i = 0; i < nr_servers; i++) { 52 tmp = ntohl(uvldb->serverFlags[i]); 53 if (!(tmp & AFS_VLSF_DONTUSE) && 54 (tmp & AFS_VLSF_NEWREPSITE)) 55 new_only = true; 56 } 57 58 vlflags = ntohl(uvldb->flags); 59 for (i = 0; i < nr_servers; i++) { 60 struct afs_uuid__xdr *xdr; 61 struct afs_uuid *uuid; 62 int j; 63 64 tmp = ntohl(uvldb->serverFlags[i]); 65 if (tmp & AFS_VLSF_DONTUSE || 66 (new_only && !(tmp & AFS_VLSF_NEWREPSITE))) 67 continue; 68 if (tmp & AFS_VLSF_RWVOL) { 69 entry->fs_mask[i] |= AFS_VOL_VTM_RW; 70 if (vlflags & AFS_VLF_BACKEXISTS) 71 entry->fs_mask[i] |= AFS_VOL_VTM_BAK; 72 } 73 if (tmp & AFS_VLSF_ROVOL) 74 entry->fs_mask[i] |= AFS_VOL_VTM_RO; 75 if (!entry->fs_mask[i]) 76 continue; 77 78 xdr = &uvldb->serverNumber[i]; 79 uuid = (struct afs_uuid *)&entry->fs_server[i]; 80 uuid->time_low = xdr->time_low; 81 uuid->time_mid = htons(ntohl(xdr->time_mid)); 82 uuid->time_hi_and_version = htons(ntohl(xdr->time_hi_and_version)); 83 uuid->clock_seq_hi_and_reserved = (u8)ntohl(xdr->clock_seq_hi_and_reserved); 84 uuid->clock_seq_low = (u8)ntohl(xdr->clock_seq_low); 85 for (j = 0; j < 6; j++) 86 uuid->node[j] = (u8)ntohl(xdr->node[j]); 87 88 entry->nr_servers++; 89 } 90 91 for (i = 0; i < AFS_MAXTYPES; i++) 92 entry->vid[i] = ntohl(uvldb->volumeId[i]); 93 94 if (vlflags & AFS_VLF_RWEXISTS) 95 __set_bit(AFS_VLDB_HAS_RW, &entry->flags); 96 if (vlflags & AFS_VLF_ROEXISTS) 97 __set_bit(AFS_VLDB_HAS_RO, &entry->flags); 98 if (vlflags & AFS_VLF_BACKEXISTS) 99 __set_bit(AFS_VLDB_HAS_BAK, &entry->flags); 100 101 if (!(vlflags & (AFS_VLF_RWEXISTS | AFS_VLF_ROEXISTS | AFS_VLF_BACKEXISTS))) { 102 entry->error = -ENOMEDIUM; 103 __set_bit(AFS_VLDB_QUERY_ERROR, &entry->flags); 104 } 105 106 __set_bit(AFS_VLDB_QUERY_VALID, &entry->flags); 107 _leave(" = 0 [done]"); 108 return 0; 109 } 110 111 static void afs_destroy_vl_get_entry_by_name_u(struct afs_call *call) 112 { 113 kfree(call->ret_vldb); 114 afs_flat_call_destructor(call); 115 } 116 117 /* 118 * VL.GetEntryByNameU operation type. 119 */ 120 static const struct afs_call_type afs_RXVLGetEntryByNameU = { 121 .name = "VL.GetEntryByNameU", 122 .op = afs_VL_GetEntryByNameU, 123 .deliver = afs_deliver_vl_get_entry_by_name_u, 124 .destructor = afs_destroy_vl_get_entry_by_name_u, 125 }; 126 127 /* 128 * Dispatch a get volume entry by name or ID operation (uuid variant). If the 129 * volname is a decimal number then it's a volume ID not a volume name. 130 */ 131 struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *vc, 132 const char *volname, 133 int volnamesz) 134 { 135 struct afs_vldb_entry *entry; 136 struct afs_call *call; 137 struct afs_net *net = vc->cell->net; 138 size_t reqsz, padsz; 139 __be32 *bp; 140 141 _enter(""); 142 143 padsz = (4 - (volnamesz & 3)) & 3; 144 reqsz = 8 + volnamesz + padsz; 145 146 entry = kzalloc(sizeof(struct afs_vldb_entry), GFP_KERNEL); 147 if (!entry) 148 return ERR_PTR(-ENOMEM); 149 150 call = afs_alloc_flat_call(net, &afs_RXVLGetEntryByNameU, reqsz, 151 sizeof(struct afs_uvldbentry__xdr)); 152 if (!call) { 153 kfree(entry); 154 return ERR_PTR(-ENOMEM); 155 } 156 157 call->key = vc->key; 158 call->ret_vldb = entry; 159 call->max_lifespan = AFS_VL_MAX_LIFESPAN; 160 161 /* Marshall the parameters */ 162 bp = call->request; 163 *bp++ = htonl(VLGETENTRYBYNAMEU); 164 *bp++ = htonl(volnamesz); 165 memcpy(bp, volname, volnamesz); 166 if (padsz > 0) 167 memset((void *)bp + volnamesz, 0, padsz); 168 169 trace_afs_make_vl_call(call); 170 afs_make_call(&vc->ac, call, GFP_KERNEL); 171 return (struct afs_vldb_entry *)afs_wait_for_call_to_complete(call, &vc->ac); 172 } 173 174 /* 175 * Deliver reply data to a VL.GetAddrsU call. 176 * 177 * GetAddrsU(IN ListAddrByAttributes *inaddr, 178 * OUT afsUUID *uuidp1, 179 * OUT uint32_t *uniquifier, 180 * OUT uint32_t *nentries, 181 * OUT bulkaddrs *blkaddrs); 182 */ 183 static int afs_deliver_vl_get_addrs_u(struct afs_call *call) 184 { 185 struct afs_addr_list *alist; 186 __be32 *bp; 187 u32 uniquifier, nentries, count; 188 int i, ret; 189 190 _enter("{%u,%zu/%u}", 191 call->unmarshall, iov_iter_count(call->_iter), call->count); 192 193 switch (call->unmarshall) { 194 case 0: 195 afs_extract_to_buf(call, 196 sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32)); 197 call->unmarshall++; 198 199 /* Extract the returned uuid, uniquifier, nentries and 200 * blkaddrs size */ 201 /* Fall through */ 202 case 1: 203 ret = afs_extract_data(call, true); 204 if (ret < 0) 205 return ret; 206 207 bp = call->buffer + sizeof(struct afs_uuid__xdr); 208 uniquifier = ntohl(*bp++); 209 nentries = ntohl(*bp++); 210 count = ntohl(*bp); 211 212 nentries = min(nentries, count); 213 alist = afs_alloc_addrlist(nentries, FS_SERVICE, AFS_FS_PORT); 214 if (!alist) 215 return -ENOMEM; 216 alist->version = uniquifier; 217 call->ret_alist = alist; 218 call->count = count; 219 call->count2 = nentries; 220 call->unmarshall++; 221 222 more_entries: 223 count = min(call->count, 4U); 224 afs_extract_to_buf(call, count * sizeof(__be32)); 225 226 /* Fall through - and extract entries */ 227 case 2: 228 ret = afs_extract_data(call, call->count > 4); 229 if (ret < 0) 230 return ret; 231 232 alist = call->ret_alist; 233 bp = call->buffer; 234 count = min(call->count, 4U); 235 for (i = 0; i < count; i++) 236 if (alist->nr_addrs < call->count2) 237 afs_merge_fs_addr4(alist, *bp++, AFS_FS_PORT); 238 239 call->count -= count; 240 if (call->count > 0) 241 goto more_entries; 242 call->unmarshall++; 243 break; 244 } 245 246 _leave(" = 0 [done]"); 247 return 0; 248 } 249 250 static void afs_vl_get_addrs_u_destructor(struct afs_call *call) 251 { 252 afs_put_addrlist(call->ret_alist); 253 return afs_flat_call_destructor(call); 254 } 255 256 /* 257 * VL.GetAddrsU operation type. 258 */ 259 static const struct afs_call_type afs_RXVLGetAddrsU = { 260 .name = "VL.GetAddrsU", 261 .op = afs_VL_GetAddrsU, 262 .deliver = afs_deliver_vl_get_addrs_u, 263 .destructor = afs_vl_get_addrs_u_destructor, 264 }; 265 266 /* 267 * Dispatch an operation to get the addresses for a server, where the server is 268 * nominated by UUID. 269 */ 270 struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *vc, 271 const uuid_t *uuid) 272 { 273 struct afs_ListAddrByAttributes__xdr *r; 274 const struct afs_uuid *u = (const struct afs_uuid *)uuid; 275 struct afs_call *call; 276 struct afs_net *net = vc->cell->net; 277 __be32 *bp; 278 int i; 279 280 _enter(""); 281 282 call = afs_alloc_flat_call(net, &afs_RXVLGetAddrsU, 283 sizeof(__be32) + sizeof(struct afs_ListAddrByAttributes__xdr), 284 sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32)); 285 if (!call) 286 return ERR_PTR(-ENOMEM); 287 288 call->key = vc->key; 289 call->ret_alist = NULL; 290 call->max_lifespan = AFS_VL_MAX_LIFESPAN; 291 292 /* Marshall the parameters */ 293 bp = call->request; 294 *bp++ = htonl(VLGETADDRSU); 295 r = (struct afs_ListAddrByAttributes__xdr *)bp; 296 r->Mask = htonl(AFS_VLADDR_UUID); 297 r->ipaddr = 0; 298 r->index = 0; 299 r->spare = 0; 300 r->uuid.time_low = u->time_low; 301 r->uuid.time_mid = htonl(ntohs(u->time_mid)); 302 r->uuid.time_hi_and_version = htonl(ntohs(u->time_hi_and_version)); 303 r->uuid.clock_seq_hi_and_reserved = htonl(u->clock_seq_hi_and_reserved); 304 r->uuid.clock_seq_low = htonl(u->clock_seq_low); 305 for (i = 0; i < 6; i++) 306 r->uuid.node[i] = htonl(u->node[i]); 307 308 trace_afs_make_vl_call(call); 309 afs_make_call(&vc->ac, call, GFP_KERNEL); 310 return (struct afs_addr_list *)afs_wait_for_call_to_complete(call, &vc->ac); 311 } 312 313 /* 314 * Deliver reply data to an VL.GetCapabilities operation. 315 */ 316 static int afs_deliver_vl_get_capabilities(struct afs_call *call) 317 { 318 u32 count; 319 int ret; 320 321 _enter("{%u,%zu/%u}", 322 call->unmarshall, iov_iter_count(call->_iter), call->count); 323 324 switch (call->unmarshall) { 325 case 0: 326 afs_extract_to_tmp(call); 327 call->unmarshall++; 328 329 /* Fall through - and extract the capabilities word count */ 330 case 1: 331 ret = afs_extract_data(call, true); 332 if (ret < 0) 333 return ret; 334 335 count = ntohl(call->tmp); 336 call->count = count; 337 call->count2 = count; 338 339 call->unmarshall++; 340 afs_extract_discard(call, count * sizeof(__be32)); 341 342 /* Fall through - and extract capabilities words */ 343 case 2: 344 ret = afs_extract_data(call, false); 345 if (ret < 0) 346 return ret; 347 348 /* TODO: Examine capabilities */ 349 350 call->unmarshall++; 351 break; 352 } 353 354 _leave(" = 0 [done]"); 355 return 0; 356 } 357 358 static void afs_destroy_vl_get_capabilities(struct afs_call *call) 359 { 360 afs_put_vlserver(call->net, call->vlserver); 361 afs_flat_call_destructor(call); 362 } 363 364 /* 365 * VL.GetCapabilities operation type 366 */ 367 static const struct afs_call_type afs_RXVLGetCapabilities = { 368 .name = "VL.GetCapabilities", 369 .op = afs_VL_GetCapabilities, 370 .deliver = afs_deliver_vl_get_capabilities, 371 .done = afs_vlserver_probe_result, 372 .destructor = afs_destroy_vl_get_capabilities, 373 }; 374 375 /* 376 * Probe a volume server for the capabilities that it supports. This can 377 * return up to 196 words. 378 * 379 * We use this to probe for service upgrade to determine what the server at the 380 * other end supports. 381 */ 382 struct afs_call *afs_vl_get_capabilities(struct afs_net *net, 383 struct afs_addr_cursor *ac, 384 struct key *key, 385 struct afs_vlserver *server, 386 unsigned int server_index) 387 { 388 struct afs_call *call; 389 __be32 *bp; 390 391 _enter(""); 392 393 call = afs_alloc_flat_call(net, &afs_RXVLGetCapabilities, 1 * 4, 16 * 4); 394 if (!call) 395 return ERR_PTR(-ENOMEM); 396 397 call->key = key; 398 call->vlserver = afs_get_vlserver(server); 399 call->server_index = server_index; 400 call->upgrade = true; 401 call->async = true; 402 call->max_lifespan = AFS_PROBE_MAX_LIFESPAN; 403 404 /* marshall the parameters */ 405 bp = call->request; 406 *bp++ = htonl(VLGETCAPABILITIES); 407 408 /* Can't take a ref on server */ 409 trace_afs_make_vl_call(call); 410 afs_make_call(ac, call, GFP_KERNEL); 411 return call; 412 } 413 414 /* 415 * Deliver reply data to a YFSVL.GetEndpoints call. 416 * 417 * GetEndpoints(IN yfsServerAttributes *attr, 418 * OUT opr_uuid *uuid, 419 * OUT afs_int32 *uniquifier, 420 * OUT endpoints *fsEndpoints, 421 * OUT endpoints *volEndpoints) 422 */ 423 static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call) 424 { 425 struct afs_addr_list *alist; 426 __be32 *bp; 427 u32 uniquifier, size; 428 int ret; 429 430 _enter("{%u,%zu,%u}", 431 call->unmarshall, iov_iter_count(call->_iter), call->count2); 432 433 switch (call->unmarshall) { 434 case 0: 435 afs_extract_to_buf(call, sizeof(uuid_t) + 3 * sizeof(__be32)); 436 call->unmarshall = 1; 437 438 /* Extract the returned uuid, uniquifier, fsEndpoints count and 439 * either the first fsEndpoint type or the volEndpoints 440 * count if there are no fsEndpoints. */ 441 /* Fall through */ 442 case 1: 443 ret = afs_extract_data(call, true); 444 if (ret < 0) 445 return ret; 446 447 bp = call->buffer + sizeof(uuid_t); 448 uniquifier = ntohl(*bp++); 449 call->count = ntohl(*bp++); 450 call->count2 = ntohl(*bp); /* Type or next count */ 451 452 if (call->count > YFS_MAXENDPOINTS) 453 return afs_protocol_error(call, -EBADMSG, 454 afs_eproto_yvl_fsendpt_num); 455 456 alist = afs_alloc_addrlist(call->count, FS_SERVICE, AFS_FS_PORT); 457 if (!alist) 458 return -ENOMEM; 459 alist->version = uniquifier; 460 call->ret_alist = alist; 461 462 if (call->count == 0) 463 goto extract_volendpoints; 464 465 next_fsendpoint: 466 switch (call->count2) { 467 case YFS_ENDPOINT_IPV4: 468 size = sizeof(__be32) * (1 + 1 + 1); 469 break; 470 case YFS_ENDPOINT_IPV6: 471 size = sizeof(__be32) * (1 + 4 + 1); 472 break; 473 default: 474 return afs_protocol_error(call, -EBADMSG, 475 afs_eproto_yvl_fsendpt_type); 476 } 477 478 size += sizeof(__be32); 479 afs_extract_to_buf(call, size); 480 call->unmarshall = 2; 481 482 /* Fall through - and extract fsEndpoints[] entries */ 483 case 2: 484 ret = afs_extract_data(call, true); 485 if (ret < 0) 486 return ret; 487 488 alist = call->ret_alist; 489 bp = call->buffer; 490 switch (call->count2) { 491 case YFS_ENDPOINT_IPV4: 492 if (ntohl(bp[0]) != sizeof(__be32) * 2) 493 return afs_protocol_error(call, -EBADMSG, 494 afs_eproto_yvl_fsendpt4_len); 495 afs_merge_fs_addr4(alist, bp[1], ntohl(bp[2])); 496 bp += 3; 497 break; 498 case YFS_ENDPOINT_IPV6: 499 if (ntohl(bp[0]) != sizeof(__be32) * 5) 500 return afs_protocol_error(call, -EBADMSG, 501 afs_eproto_yvl_fsendpt6_len); 502 afs_merge_fs_addr6(alist, bp + 1, ntohl(bp[5])); 503 bp += 6; 504 break; 505 default: 506 return afs_protocol_error(call, -EBADMSG, 507 afs_eproto_yvl_fsendpt_type); 508 } 509 510 /* Got either the type of the next entry or the count of 511 * volEndpoints if no more fsEndpoints. 512 */ 513 call->count2 = ntohl(*bp++); 514 515 call->count--; 516 if (call->count > 0) 517 goto next_fsendpoint; 518 519 extract_volendpoints: 520 /* Extract the list of volEndpoints. */ 521 call->count = call->count2; 522 if (!call->count) 523 goto end; 524 if (call->count > YFS_MAXENDPOINTS) 525 return afs_protocol_error(call, -EBADMSG, 526 afs_eproto_yvl_vlendpt_type); 527 528 afs_extract_to_buf(call, 1 * sizeof(__be32)); 529 call->unmarshall = 3; 530 531 /* Extract the type of volEndpoints[0]. Normally we would 532 * extract the type of the next endpoint when we extract the 533 * data of the current one, but this is the first... 534 */ 535 /* Fall through */ 536 case 3: 537 ret = afs_extract_data(call, true); 538 if (ret < 0) 539 return ret; 540 541 bp = call->buffer; 542 543 next_volendpoint: 544 call->count2 = ntohl(*bp++); 545 switch (call->count2) { 546 case YFS_ENDPOINT_IPV4: 547 size = sizeof(__be32) * (1 + 1 + 1); 548 break; 549 case YFS_ENDPOINT_IPV6: 550 size = sizeof(__be32) * (1 + 4 + 1); 551 break; 552 default: 553 return afs_protocol_error(call, -EBADMSG, 554 afs_eproto_yvl_vlendpt_type); 555 } 556 557 if (call->count > 1) 558 size += sizeof(__be32); /* Get next type too */ 559 afs_extract_to_buf(call, size); 560 call->unmarshall = 4; 561 562 /* Fall through - and extract volEndpoints[] entries */ 563 case 4: 564 ret = afs_extract_data(call, true); 565 if (ret < 0) 566 return ret; 567 568 bp = call->buffer; 569 switch (call->count2) { 570 case YFS_ENDPOINT_IPV4: 571 if (ntohl(bp[0]) != sizeof(__be32) * 2) 572 return afs_protocol_error(call, -EBADMSG, 573 afs_eproto_yvl_vlendpt4_len); 574 bp += 3; 575 break; 576 case YFS_ENDPOINT_IPV6: 577 if (ntohl(bp[0]) != sizeof(__be32) * 5) 578 return afs_protocol_error(call, -EBADMSG, 579 afs_eproto_yvl_vlendpt6_len); 580 bp += 6; 581 break; 582 default: 583 return afs_protocol_error(call, -EBADMSG, 584 afs_eproto_yvl_vlendpt_type); 585 } 586 587 /* Got either the type of the next entry or the count of 588 * volEndpoints if no more fsEndpoints. 589 */ 590 call->count--; 591 if (call->count > 0) 592 goto next_volendpoint; 593 594 end: 595 afs_extract_discard(call, 0); 596 call->unmarshall = 5; 597 598 /* Fall through - Done */ 599 case 5: 600 ret = afs_extract_data(call, false); 601 if (ret < 0) 602 return ret; 603 call->unmarshall = 6; 604 605 case 6: 606 break; 607 } 608 609 _leave(" = 0 [done]"); 610 return 0; 611 } 612 613 /* 614 * YFSVL.GetEndpoints operation type. 615 */ 616 static const struct afs_call_type afs_YFSVLGetEndpoints = { 617 .name = "YFSVL.GetEndpoints", 618 .op = afs_YFSVL_GetEndpoints, 619 .deliver = afs_deliver_yfsvl_get_endpoints, 620 .destructor = afs_vl_get_addrs_u_destructor, 621 }; 622 623 /* 624 * Dispatch an operation to get the addresses for a server, where the server is 625 * nominated by UUID. 626 */ 627 struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *vc, 628 const uuid_t *uuid) 629 { 630 struct afs_call *call; 631 struct afs_net *net = vc->cell->net; 632 __be32 *bp; 633 634 _enter(""); 635 636 call = afs_alloc_flat_call(net, &afs_YFSVLGetEndpoints, 637 sizeof(__be32) * 2 + sizeof(*uuid), 638 sizeof(struct in6_addr) + sizeof(__be32) * 3); 639 if (!call) 640 return ERR_PTR(-ENOMEM); 641 642 call->key = vc->key; 643 call->ret_alist = NULL; 644 call->max_lifespan = AFS_VL_MAX_LIFESPAN; 645 646 /* Marshall the parameters */ 647 bp = call->request; 648 *bp++ = htonl(YVLGETENDPOINTS); 649 *bp++ = htonl(YFS_SERVER_UUID); 650 memcpy(bp, uuid, sizeof(*uuid)); /* Type opr_uuid */ 651 652 trace_afs_make_vl_call(call); 653 afs_make_call(&vc->ac, call, GFP_KERNEL); 654 return (struct afs_addr_list *)afs_wait_for_call_to_complete(call, &vc->ac); 655 } 656