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->reply[0]; 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->reply[0]); 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->reply[0] = entry; 159 call->ret_reply0 = true; 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 return (struct afs_vldb_entry *)afs_make_call(&vc->ac, call, GFP_KERNEL, false); 171 } 172 173 /* 174 * Deliver reply data to a VL.GetAddrsU call. 175 * 176 * GetAddrsU(IN ListAddrByAttributes *inaddr, 177 * OUT afsUUID *uuidp1, 178 * OUT uint32_t *uniquifier, 179 * OUT uint32_t *nentries, 180 * OUT bulkaddrs *blkaddrs); 181 */ 182 static int afs_deliver_vl_get_addrs_u(struct afs_call *call) 183 { 184 struct afs_addr_list *alist; 185 __be32 *bp; 186 u32 uniquifier, nentries, count; 187 int i, ret; 188 189 _enter("{%u,%zu/%u}", 190 call->unmarshall, iov_iter_count(call->_iter), call->count); 191 192 switch (call->unmarshall) { 193 case 0: 194 afs_extract_to_buf(call, 195 sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32)); 196 call->unmarshall++; 197 198 /* Extract the returned uuid, uniquifier, nentries and blkaddrs size */ 199 case 1: 200 ret = afs_extract_data(call, true); 201 if (ret < 0) 202 return ret; 203 204 bp = call->buffer + sizeof(struct afs_uuid__xdr); 205 uniquifier = ntohl(*bp++); 206 nentries = ntohl(*bp++); 207 count = ntohl(*bp); 208 209 nentries = min(nentries, count); 210 alist = afs_alloc_addrlist(nentries, FS_SERVICE, AFS_FS_PORT); 211 if (!alist) 212 return -ENOMEM; 213 alist->version = uniquifier; 214 call->reply[0] = alist; 215 call->count = count; 216 call->count2 = nentries; 217 call->unmarshall++; 218 219 more_entries: 220 count = min(call->count, 4U); 221 afs_extract_to_buf(call, count * sizeof(__be32)); 222 223 /* Extract entries */ 224 case 2: 225 ret = afs_extract_data(call, call->count > 4); 226 if (ret < 0) 227 return ret; 228 229 alist = call->reply[0]; 230 bp = call->buffer; 231 count = min(call->count, 4U); 232 for (i = 0; i < count; i++) 233 if (alist->nr_addrs < call->count2) 234 afs_merge_fs_addr4(alist, *bp++, AFS_FS_PORT); 235 236 call->count -= count; 237 if (call->count > 0) 238 goto more_entries; 239 call->unmarshall++; 240 break; 241 } 242 243 _leave(" = 0 [done]"); 244 return 0; 245 } 246 247 static void afs_vl_get_addrs_u_destructor(struct afs_call *call) 248 { 249 afs_put_server(call->net, (struct afs_server *)call->reply[0]); 250 kfree(call->reply[1]); 251 return afs_flat_call_destructor(call); 252 } 253 254 /* 255 * VL.GetAddrsU operation type. 256 */ 257 static const struct afs_call_type afs_RXVLGetAddrsU = { 258 .name = "VL.GetAddrsU", 259 .op = afs_VL_GetAddrsU, 260 .deliver = afs_deliver_vl_get_addrs_u, 261 .destructor = afs_vl_get_addrs_u_destructor, 262 }; 263 264 /* 265 * Dispatch an operation to get the addresses for a server, where the server is 266 * nominated by UUID. 267 */ 268 struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *vc, 269 const uuid_t *uuid) 270 { 271 struct afs_ListAddrByAttributes__xdr *r; 272 const struct afs_uuid *u = (const struct afs_uuid *)uuid; 273 struct afs_call *call; 274 struct afs_net *net = vc->cell->net; 275 __be32 *bp; 276 int i; 277 278 _enter(""); 279 280 call = afs_alloc_flat_call(net, &afs_RXVLGetAddrsU, 281 sizeof(__be32) + sizeof(struct afs_ListAddrByAttributes__xdr), 282 sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32)); 283 if (!call) 284 return ERR_PTR(-ENOMEM); 285 286 call->key = vc->key; 287 call->reply[0] = NULL; 288 call->ret_reply0 = true; 289 290 /* Marshall the parameters */ 291 bp = call->request; 292 *bp++ = htonl(VLGETADDRSU); 293 r = (struct afs_ListAddrByAttributes__xdr *)bp; 294 r->Mask = htonl(AFS_VLADDR_UUID); 295 r->ipaddr = 0; 296 r->index = 0; 297 r->spare = 0; 298 r->uuid.time_low = u->time_low; 299 r->uuid.time_mid = htonl(ntohs(u->time_mid)); 300 r->uuid.time_hi_and_version = htonl(ntohs(u->time_hi_and_version)); 301 r->uuid.clock_seq_hi_and_reserved = htonl(u->clock_seq_hi_and_reserved); 302 r->uuid.clock_seq_low = htonl(u->clock_seq_low); 303 for (i = 0; i < 6; i++) 304 r->uuid.node[i] = htonl(u->node[i]); 305 306 trace_afs_make_vl_call(call); 307 return (struct afs_addr_list *)afs_make_call(&vc->ac, call, GFP_KERNEL, false); 308 } 309 310 /* 311 * Deliver reply data to an VL.GetCapabilities operation. 312 */ 313 static int afs_deliver_vl_get_capabilities(struct afs_call *call) 314 { 315 u32 count; 316 int ret; 317 318 _enter("{%u,%zu/%u}", 319 call->unmarshall, iov_iter_count(call->_iter), call->count); 320 321 switch (call->unmarshall) { 322 case 0: 323 afs_extract_to_tmp(call); 324 call->unmarshall++; 325 326 /* Extract the capabilities word count */ 327 case 1: 328 ret = afs_extract_data(call, true); 329 if (ret < 0) 330 return ret; 331 332 count = ntohl(call->tmp); 333 call->count = count; 334 call->count2 = count; 335 336 call->unmarshall++; 337 afs_extract_discard(call, count * sizeof(__be32)); 338 339 /* Extract capabilities words */ 340 case 2: 341 ret = afs_extract_data(call, false); 342 if (ret < 0) 343 return ret; 344 345 /* TODO: Examine capabilities */ 346 347 call->unmarshall++; 348 break; 349 } 350 351 _leave(" = 0 [done]"); 352 return 0; 353 } 354 355 static void afs_destroy_vl_get_capabilities(struct afs_call *call) 356 { 357 struct afs_vlserver *server = call->reply[0]; 358 359 afs_put_vlserver(call->net, server); 360 afs_flat_call_destructor(call); 361 } 362 363 /* 364 * VL.GetCapabilities operation type 365 */ 366 static const struct afs_call_type afs_RXVLGetCapabilities = { 367 .name = "VL.GetCapabilities", 368 .op = afs_VL_GetCapabilities, 369 .deliver = afs_deliver_vl_get_capabilities, 370 .done = afs_vlserver_probe_result, 371 .destructor = afs_destroy_vl_get_capabilities, 372 }; 373 374 /* 375 * Probe a volume server for the capabilities that it supports. This can 376 * return up to 196 words. 377 * 378 * We use this to probe for service upgrade to determine what the server at the 379 * other end supports. 380 */ 381 int afs_vl_get_capabilities(struct afs_net *net, 382 struct afs_addr_cursor *ac, 383 struct key *key, 384 struct afs_vlserver *server, 385 unsigned int server_index, 386 bool async) 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 -ENOMEM; 396 397 call->key = key; 398 call->reply[0] = afs_get_vlserver(server); 399 call->reply[1] = (void *)(long)server_index; 400 call->upgrade = true; 401 call->want_reply_time = true; 402 403 /* marshall the parameters */ 404 bp = call->request; 405 *bp++ = htonl(VLGETCAPABILITIES); 406 407 /* Can't take a ref on server */ 408 trace_afs_make_vl_call(call); 409 return afs_make_call(ac, call, GFP_KERNEL, async); 410 } 411 412 /* 413 * Deliver reply data to a YFSVL.GetEndpoints call. 414 * 415 * GetEndpoints(IN yfsServerAttributes *attr, 416 * OUT opr_uuid *uuid, 417 * OUT afs_int32 *uniquifier, 418 * OUT endpoints *fsEndpoints, 419 * OUT endpoints *volEndpoints) 420 */ 421 static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call) 422 { 423 struct afs_addr_list *alist; 424 __be32 *bp; 425 u32 uniquifier, size; 426 int ret; 427 428 _enter("{%u,%zu,%u}", 429 call->unmarshall, iov_iter_count(call->_iter), call->count2); 430 431 switch (call->unmarshall) { 432 case 0: 433 afs_extract_to_buf(call, sizeof(uuid_t) + 3 * sizeof(__be32)); 434 call->unmarshall = 1; 435 436 /* Extract the returned uuid, uniquifier, fsEndpoints count and 437 * either the first fsEndpoint type or the volEndpoints 438 * count if there are no fsEndpoints. */ 439 case 1: 440 ret = afs_extract_data(call, true); 441 if (ret < 0) 442 return ret; 443 444 bp = call->buffer + sizeof(uuid_t); 445 uniquifier = ntohl(*bp++); 446 call->count = ntohl(*bp++); 447 call->count2 = ntohl(*bp); /* Type or next count */ 448 449 if (call->count > YFS_MAXENDPOINTS) 450 return afs_protocol_error(call, -EBADMSG, 451 afs_eproto_yvl_fsendpt_num); 452 453 alist = afs_alloc_addrlist(call->count, FS_SERVICE, AFS_FS_PORT); 454 if (!alist) 455 return -ENOMEM; 456 alist->version = uniquifier; 457 call->reply[0] = alist; 458 459 if (call->count == 0) 460 goto extract_volendpoints; 461 462 next_fsendpoint: 463 switch (call->count2) { 464 case YFS_ENDPOINT_IPV4: 465 size = sizeof(__be32) * (1 + 1 + 1); 466 break; 467 case YFS_ENDPOINT_IPV6: 468 size = sizeof(__be32) * (1 + 4 + 1); 469 break; 470 default: 471 return afs_protocol_error(call, -EBADMSG, 472 afs_eproto_yvl_fsendpt_type); 473 } 474 475 size += sizeof(__be32); 476 afs_extract_to_buf(call, size); 477 call->unmarshall = 2; 478 479 /* Extract fsEndpoints[] entries */ 480 case 2: 481 ret = afs_extract_data(call, true); 482 if (ret < 0) 483 return ret; 484 485 alist = call->reply[0]; 486 bp = call->buffer; 487 switch (call->count2) { 488 case YFS_ENDPOINT_IPV4: 489 if (ntohl(bp[0]) != sizeof(__be32) * 2) 490 return afs_protocol_error(call, -EBADMSG, 491 afs_eproto_yvl_fsendpt4_len); 492 afs_merge_fs_addr4(alist, bp[1], ntohl(bp[2])); 493 bp += 3; 494 break; 495 case YFS_ENDPOINT_IPV6: 496 if (ntohl(bp[0]) != sizeof(__be32) * 5) 497 return afs_protocol_error(call, -EBADMSG, 498 afs_eproto_yvl_fsendpt6_len); 499 afs_merge_fs_addr6(alist, bp + 1, ntohl(bp[5])); 500 bp += 6; 501 break; 502 default: 503 return afs_protocol_error(call, -EBADMSG, 504 afs_eproto_yvl_fsendpt_type); 505 } 506 507 /* Got either the type of the next entry or the count of 508 * volEndpoints if no more fsEndpoints. 509 */ 510 call->count2 = ntohl(*bp++); 511 512 call->count--; 513 if (call->count > 0) 514 goto next_fsendpoint; 515 516 extract_volendpoints: 517 /* Extract the list of volEndpoints. */ 518 call->count = call->count2; 519 if (!call->count) 520 goto end; 521 if (call->count > YFS_MAXENDPOINTS) 522 return afs_protocol_error(call, -EBADMSG, 523 afs_eproto_yvl_vlendpt_type); 524 525 afs_extract_to_buf(call, 1 * sizeof(__be32)); 526 call->unmarshall = 3; 527 528 /* Extract the type of volEndpoints[0]. Normally we would 529 * extract the type of the next endpoint when we extract the 530 * data of the current one, but this is the first... 531 */ 532 case 3: 533 ret = afs_extract_data(call, true); 534 if (ret < 0) 535 return ret; 536 537 bp = call->buffer; 538 539 next_volendpoint: 540 call->count2 = ntohl(*bp++); 541 switch (call->count2) { 542 case YFS_ENDPOINT_IPV4: 543 size = sizeof(__be32) * (1 + 1 + 1); 544 break; 545 case YFS_ENDPOINT_IPV6: 546 size = sizeof(__be32) * (1 + 4 + 1); 547 break; 548 default: 549 return afs_protocol_error(call, -EBADMSG, 550 afs_eproto_yvl_vlendpt_type); 551 } 552 553 if (call->count > 1) 554 size += sizeof(__be32); /* Get next type too */ 555 afs_extract_to_buf(call, size); 556 call->unmarshall = 4; 557 558 /* Extract volEndpoints[] entries */ 559 case 4: 560 ret = afs_extract_data(call, true); 561 if (ret < 0) 562 return ret; 563 564 bp = call->buffer; 565 switch (call->count2) { 566 case YFS_ENDPOINT_IPV4: 567 if (ntohl(bp[0]) != sizeof(__be32) * 2) 568 return afs_protocol_error(call, -EBADMSG, 569 afs_eproto_yvl_vlendpt4_len); 570 bp += 3; 571 break; 572 case YFS_ENDPOINT_IPV6: 573 if (ntohl(bp[0]) != sizeof(__be32) * 5) 574 return afs_protocol_error(call, -EBADMSG, 575 afs_eproto_yvl_vlendpt6_len); 576 bp += 6; 577 break; 578 default: 579 return afs_protocol_error(call, -EBADMSG, 580 afs_eproto_yvl_vlendpt_type); 581 } 582 583 /* Got either the type of the next entry or the count of 584 * volEndpoints if no more fsEndpoints. 585 */ 586 call->count--; 587 if (call->count > 0) 588 goto next_volendpoint; 589 590 end: 591 afs_extract_discard(call, 0); 592 call->unmarshall = 5; 593 594 /* Done */ 595 case 5: 596 ret = afs_extract_data(call, false); 597 if (ret < 0) 598 return ret; 599 call->unmarshall = 6; 600 601 case 6: 602 break; 603 } 604 605 alist = call->reply[0]; 606 _leave(" = 0 [done]"); 607 return 0; 608 } 609 610 /* 611 * YFSVL.GetEndpoints operation type. 612 */ 613 static const struct afs_call_type afs_YFSVLGetEndpoints = { 614 .name = "YFSVL.GetEndpoints", 615 .op = afs_YFSVL_GetEndpoints, 616 .deliver = afs_deliver_yfsvl_get_endpoints, 617 .destructor = afs_vl_get_addrs_u_destructor, 618 }; 619 620 /* 621 * Dispatch an operation to get the addresses for a server, where the server is 622 * nominated by UUID. 623 */ 624 struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *vc, 625 const uuid_t *uuid) 626 { 627 struct afs_call *call; 628 struct afs_net *net = vc->cell->net; 629 __be32 *bp; 630 631 _enter(""); 632 633 call = afs_alloc_flat_call(net, &afs_YFSVLGetEndpoints, 634 sizeof(__be32) * 2 + sizeof(*uuid), 635 sizeof(struct in6_addr) + sizeof(__be32) * 3); 636 if (!call) 637 return ERR_PTR(-ENOMEM); 638 639 call->key = vc->key; 640 call->reply[0] = NULL; 641 call->ret_reply0 = true; 642 643 /* Marshall the parameters */ 644 bp = call->request; 645 *bp++ = htonl(YVLGETENDPOINTS); 646 *bp++ = htonl(YFS_SERVER_UUID); 647 memcpy(bp, uuid, sizeof(*uuid)); /* Type opr_uuid */ 648 649 trace_afs_make_vl_call(call); 650 return (struct afs_addr_list *)afs_make_call(&vc->ac, call, GFP_KERNEL, false); 651 } 652