1 /* 2 * Server-side XDR for NFSv4 3 * 4 * Copyright (c) 2002 The Regents of the University of Michigan. 5 * All rights reserved. 6 * 7 * Kendrick Smith <kmsmith@umich.edu> 8 * Andy Adamson <andros@umich.edu> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <linux/file.h> 37 #include <linux/slab.h> 38 #include <linux/namei.h> 39 #include <linux/statfs.h> 40 #include <linux/utsname.h> 41 #include <linux/pagemap.h> 42 #include <linux/sunrpc/svcauth_gss.h> 43 44 #include "idmap.h" 45 #include "acl.h" 46 #include "xdr4.h" 47 #include "vfs.h" 48 #include "state.h" 49 #include "cache.h" 50 #include "netns.h" 51 #include "pnfs.h" 52 53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 54 #include <linux/security.h> 55 #endif 56 57 58 #define NFSDDBG_FACILITY NFSDDBG_XDR 59 60 const u32 nfsd_suppattrs[3][3] = { 61 {NFSD4_SUPPORTED_ATTRS_WORD0, 62 NFSD4_SUPPORTED_ATTRS_WORD1, 63 NFSD4_SUPPORTED_ATTRS_WORD2}, 64 65 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 66 NFSD4_1_SUPPORTED_ATTRS_WORD1, 67 NFSD4_1_SUPPORTED_ATTRS_WORD2}, 68 69 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 70 NFSD4_1_SUPPORTED_ATTRS_WORD1, 71 NFSD4_2_SUPPORTED_ATTRS_WORD2}, 72 }; 73 74 /* 75 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing 76 * directory in order to indicate to the client that a filesystem boundary is present 77 * We use a fixed fsid for a referral 78 */ 79 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL 80 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL 81 82 static __be32 83 check_filename(char *str, int len) 84 { 85 int i; 86 87 if (len == 0) 88 return nfserr_inval; 89 if (isdotent(str, len)) 90 return nfserr_badname; 91 for (i = 0; i < len; i++) 92 if (str[i] == '/') 93 return nfserr_badname; 94 return 0; 95 } 96 97 #define DECODE_HEAD \ 98 __be32 *p; \ 99 __be32 status 100 #define DECODE_TAIL \ 101 status = 0; \ 102 out: \ 103 return status; \ 104 xdr_error: \ 105 dprintk("NFSD: xdr error (%s:%d)\n", \ 106 __FILE__, __LINE__); \ 107 status = nfserr_bad_xdr; \ 108 goto out 109 110 #define READMEM(x,nbytes) do { \ 111 x = (char *)p; \ 112 p += XDR_QUADLEN(nbytes); \ 113 } while (0) 114 #define SAVEMEM(x,nbytes) do { \ 115 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \ 116 savemem(argp, p, nbytes) : \ 117 (char *)p)) { \ 118 dprintk("NFSD: xdr error (%s:%d)\n", \ 119 __FILE__, __LINE__); \ 120 goto xdr_error; \ 121 } \ 122 p += XDR_QUADLEN(nbytes); \ 123 } while (0) 124 #define COPYMEM(x,nbytes) do { \ 125 memcpy((x), p, nbytes); \ 126 p += XDR_QUADLEN(nbytes); \ 127 } while (0) 128 129 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */ 130 #define READ_BUF(nbytes) do { \ 131 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \ 132 p = argp->p; \ 133 argp->p += XDR_QUADLEN(nbytes); \ 134 } else if (!(p = read_buf(argp, nbytes))) { \ 135 dprintk("NFSD: xdr error (%s:%d)\n", \ 136 __FILE__, __LINE__); \ 137 goto xdr_error; \ 138 } \ 139 } while (0) 140 141 static void next_decode_page(struct nfsd4_compoundargs *argp) 142 { 143 argp->p = page_address(argp->pagelist[0]); 144 argp->pagelist++; 145 if (argp->pagelen < PAGE_SIZE) { 146 argp->end = argp->p + XDR_QUADLEN(argp->pagelen); 147 argp->pagelen = 0; 148 } else { 149 argp->end = argp->p + (PAGE_SIZE>>2); 150 argp->pagelen -= PAGE_SIZE; 151 } 152 } 153 154 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes) 155 { 156 /* We want more bytes than seem to be available. 157 * Maybe we need a new page, maybe we have just run out 158 */ 159 unsigned int avail = (char *)argp->end - (char *)argp->p; 160 __be32 *p; 161 162 if (argp->pagelen == 0) { 163 struct kvec *vec = &argp->rqstp->rq_arg.tail[0]; 164 165 if (!argp->tail) { 166 argp->tail = true; 167 avail = vec->iov_len; 168 argp->p = vec->iov_base; 169 argp->end = vec->iov_base + avail; 170 } 171 172 if (avail < nbytes) 173 return NULL; 174 175 p = argp->p; 176 argp->p += XDR_QUADLEN(nbytes); 177 return p; 178 } 179 180 if (avail + argp->pagelen < nbytes) 181 return NULL; 182 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */ 183 return NULL; 184 /* ok, we can do it with the current plus the next page */ 185 if (nbytes <= sizeof(argp->tmp)) 186 p = argp->tmp; 187 else { 188 kfree(argp->tmpp); 189 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL); 190 if (!p) 191 return NULL; 192 193 } 194 /* 195 * The following memcpy is safe because read_buf is always 196 * called with nbytes > avail, and the two cases above both 197 * guarantee p points to at least nbytes bytes. 198 */ 199 memcpy(p, argp->p, avail); 200 next_decode_page(argp); 201 memcpy(((char*)p)+avail, argp->p, (nbytes - avail)); 202 argp->p += XDR_QUADLEN(nbytes - avail); 203 return p; 204 } 205 206 static int zero_clientid(clientid_t *clid) 207 { 208 return (clid->cl_boot == 0) && (clid->cl_id == 0); 209 } 210 211 /** 212 * svcxdr_tmpalloc - allocate memory to be freed after compound processing 213 * @argp: NFSv4 compound argument structure 214 * @p: pointer to be freed (with kfree()) 215 * 216 * Marks @p to be freed when processing the compound operation 217 * described in @argp finishes. 218 */ 219 static void * 220 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len) 221 { 222 struct svcxdr_tmpbuf *tb; 223 224 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL); 225 if (!tb) 226 return NULL; 227 tb->next = argp->to_free; 228 argp->to_free = tb; 229 return tb->buf; 230 } 231 232 /* 233 * For xdr strings that need to be passed to other kernel api's 234 * as null-terminated strings. 235 * 236 * Note null-terminating in place usually isn't safe since the 237 * buffer might end on a page boundary. 238 */ 239 static char * 240 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len) 241 { 242 char *p = svcxdr_tmpalloc(argp, len + 1); 243 244 if (!p) 245 return NULL; 246 memcpy(p, buf, len); 247 p[len] = '\0'; 248 return p; 249 } 250 251 /** 252 * savemem - duplicate a chunk of memory for later processing 253 * @argp: NFSv4 compound argument structure to be freed with 254 * @p: pointer to be duplicated 255 * @nbytes: length to be duplicated 256 * 257 * Returns a pointer to a copy of @nbytes bytes of memory at @p 258 * that are preserved until processing of the NFSv4 compound 259 * operation described by @argp finishes. 260 */ 261 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes) 262 { 263 void *ret; 264 265 ret = svcxdr_tmpalloc(argp, nbytes); 266 if (!ret) 267 return NULL; 268 memcpy(ret, p, nbytes); 269 return ret; 270 } 271 272 /* 273 * We require the high 32 bits of 'seconds' to be 0, and 274 * we ignore all 32 bits of 'nseconds'. 275 */ 276 static __be32 277 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv) 278 { 279 DECODE_HEAD; 280 u64 sec; 281 282 READ_BUF(12); 283 p = xdr_decode_hyper(p, &sec); 284 tv->tv_sec = sec; 285 tv->tv_nsec = be32_to_cpup(p++); 286 if (tv->tv_nsec >= (u32)1000000000) 287 return nfserr_inval; 288 289 DECODE_TAIL; 290 } 291 292 static __be32 293 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval) 294 { 295 u32 bmlen; 296 DECODE_HEAD; 297 298 bmval[0] = 0; 299 bmval[1] = 0; 300 bmval[2] = 0; 301 302 READ_BUF(4); 303 bmlen = be32_to_cpup(p++); 304 if (bmlen > 1000) 305 goto xdr_error; 306 307 READ_BUF(bmlen << 2); 308 if (bmlen > 0) 309 bmval[0] = be32_to_cpup(p++); 310 if (bmlen > 1) 311 bmval[1] = be32_to_cpup(p++); 312 if (bmlen > 2) 313 bmval[2] = be32_to_cpup(p++); 314 315 DECODE_TAIL; 316 } 317 318 static __be32 319 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, 320 struct iattr *iattr, struct nfs4_acl **acl, 321 struct xdr_netobj *label, int *umask) 322 { 323 int expected_len, len = 0; 324 u32 dummy32; 325 char *buf; 326 327 DECODE_HEAD; 328 iattr->ia_valid = 0; 329 if ((status = nfsd4_decode_bitmap(argp, bmval))) 330 return status; 331 332 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0 333 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1 334 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) { 335 if (nfsd_attrs_supported(argp->minorversion, bmval)) 336 return nfserr_inval; 337 return nfserr_attrnotsupp; 338 } 339 340 READ_BUF(4); 341 expected_len = be32_to_cpup(p++); 342 343 if (bmval[0] & FATTR4_WORD0_SIZE) { 344 READ_BUF(8); 345 len += 8; 346 p = xdr_decode_hyper(p, &iattr->ia_size); 347 iattr->ia_valid |= ATTR_SIZE; 348 } 349 if (bmval[0] & FATTR4_WORD0_ACL) { 350 u32 nace; 351 struct nfs4_ace *ace; 352 353 READ_BUF(4); len += 4; 354 nace = be32_to_cpup(p++); 355 356 if (nace > NFS4_ACL_MAX) 357 return nfserr_fbig; 358 359 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace)); 360 if (*acl == NULL) 361 return nfserr_jukebox; 362 363 (*acl)->naces = nace; 364 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) { 365 READ_BUF(16); len += 16; 366 ace->type = be32_to_cpup(p++); 367 ace->flag = be32_to_cpup(p++); 368 ace->access_mask = be32_to_cpup(p++); 369 dummy32 = be32_to_cpup(p++); 370 READ_BUF(dummy32); 371 len += XDR_QUADLEN(dummy32) << 2; 372 READMEM(buf, dummy32); 373 ace->whotype = nfs4_acl_get_whotype(buf, dummy32); 374 status = nfs_ok; 375 if (ace->whotype != NFS4_ACL_WHO_NAMED) 376 ; 377 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 378 status = nfsd_map_name_to_gid(argp->rqstp, 379 buf, dummy32, &ace->who_gid); 380 else 381 status = nfsd_map_name_to_uid(argp->rqstp, 382 buf, dummy32, &ace->who_uid); 383 if (status) 384 return status; 385 } 386 } else 387 *acl = NULL; 388 if (bmval[1] & FATTR4_WORD1_MODE) { 389 READ_BUF(4); 390 len += 4; 391 iattr->ia_mode = be32_to_cpup(p++); 392 iattr->ia_mode &= (S_IFMT | S_IALLUGO); 393 iattr->ia_valid |= ATTR_MODE; 394 } 395 if (bmval[1] & FATTR4_WORD1_OWNER) { 396 READ_BUF(4); 397 len += 4; 398 dummy32 = be32_to_cpup(p++); 399 READ_BUF(dummy32); 400 len += (XDR_QUADLEN(dummy32) << 2); 401 READMEM(buf, dummy32); 402 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid))) 403 return status; 404 iattr->ia_valid |= ATTR_UID; 405 } 406 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { 407 READ_BUF(4); 408 len += 4; 409 dummy32 = be32_to_cpup(p++); 410 READ_BUF(dummy32); 411 len += (XDR_QUADLEN(dummy32) << 2); 412 READMEM(buf, dummy32); 413 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid))) 414 return status; 415 iattr->ia_valid |= ATTR_GID; 416 } 417 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { 418 READ_BUF(4); 419 len += 4; 420 dummy32 = be32_to_cpup(p++); 421 switch (dummy32) { 422 case NFS4_SET_TO_CLIENT_TIME: 423 len += 12; 424 status = nfsd4_decode_time(argp, &iattr->ia_atime); 425 if (status) 426 return status; 427 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 428 break; 429 case NFS4_SET_TO_SERVER_TIME: 430 iattr->ia_valid |= ATTR_ATIME; 431 break; 432 default: 433 goto xdr_error; 434 } 435 } 436 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 437 READ_BUF(4); 438 len += 4; 439 dummy32 = be32_to_cpup(p++); 440 switch (dummy32) { 441 case NFS4_SET_TO_CLIENT_TIME: 442 len += 12; 443 status = nfsd4_decode_time(argp, &iattr->ia_mtime); 444 if (status) 445 return status; 446 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 447 break; 448 case NFS4_SET_TO_SERVER_TIME: 449 iattr->ia_valid |= ATTR_MTIME; 450 break; 451 default: 452 goto xdr_error; 453 } 454 } 455 456 label->len = 0; 457 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) && 458 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) { 459 READ_BUF(4); 460 len += 4; 461 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */ 462 READ_BUF(4); 463 len += 4; 464 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */ 465 READ_BUF(4); 466 len += 4; 467 dummy32 = be32_to_cpup(p++); 468 READ_BUF(dummy32); 469 if (dummy32 > NFS4_MAXLABELLEN) 470 return nfserr_badlabel; 471 len += (XDR_QUADLEN(dummy32) << 2); 472 READMEM(buf, dummy32); 473 label->len = dummy32; 474 label->data = svcxdr_dupstr(argp, buf, dummy32); 475 if (!label->data) 476 return nfserr_jukebox; 477 } 478 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) { 479 if (!umask) 480 goto xdr_error; 481 READ_BUF(8); 482 len += 8; 483 dummy32 = be32_to_cpup(p++); 484 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO); 485 dummy32 = be32_to_cpup(p++); 486 *umask = dummy32 & S_IRWXUGO; 487 iattr->ia_valid |= ATTR_MODE; 488 } 489 if (len != expected_len) 490 goto xdr_error; 491 492 DECODE_TAIL; 493 } 494 495 static __be32 496 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid) 497 { 498 DECODE_HEAD; 499 500 READ_BUF(sizeof(stateid_t)); 501 sid->si_generation = be32_to_cpup(p++); 502 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t)); 503 504 DECODE_TAIL; 505 } 506 507 static __be32 508 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access) 509 { 510 DECODE_HEAD; 511 512 READ_BUF(4); 513 access->ac_req_access = be32_to_cpup(p++); 514 515 DECODE_TAIL; 516 } 517 518 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs) 519 { 520 DECODE_HEAD; 521 u32 dummy, uid, gid; 522 char *machine_name; 523 int i; 524 int nr_secflavs; 525 526 /* callback_sec_params4 */ 527 READ_BUF(4); 528 nr_secflavs = be32_to_cpup(p++); 529 if (nr_secflavs) 530 cbs->flavor = (u32)(-1); 531 else 532 /* Is this legal? Be generous, take it to mean AUTH_NONE: */ 533 cbs->flavor = 0; 534 for (i = 0; i < nr_secflavs; ++i) { 535 READ_BUF(4); 536 dummy = be32_to_cpup(p++); 537 switch (dummy) { 538 case RPC_AUTH_NULL: 539 /* Nothing to read */ 540 if (cbs->flavor == (u32)(-1)) 541 cbs->flavor = RPC_AUTH_NULL; 542 break; 543 case RPC_AUTH_UNIX: 544 READ_BUF(8); 545 /* stamp */ 546 dummy = be32_to_cpup(p++); 547 548 /* machine name */ 549 dummy = be32_to_cpup(p++); 550 READ_BUF(dummy); 551 SAVEMEM(machine_name, dummy); 552 553 /* uid, gid */ 554 READ_BUF(8); 555 uid = be32_to_cpup(p++); 556 gid = be32_to_cpup(p++); 557 558 /* more gids */ 559 READ_BUF(4); 560 dummy = be32_to_cpup(p++); 561 READ_BUF(dummy * 4); 562 if (cbs->flavor == (u32)(-1)) { 563 kuid_t kuid = make_kuid(&init_user_ns, uid); 564 kgid_t kgid = make_kgid(&init_user_ns, gid); 565 if (uid_valid(kuid) && gid_valid(kgid)) { 566 cbs->uid = kuid; 567 cbs->gid = kgid; 568 cbs->flavor = RPC_AUTH_UNIX; 569 } else { 570 dprintk("RPC_AUTH_UNIX with invalid" 571 "uid or gid ignoring!\n"); 572 } 573 } 574 break; 575 case RPC_AUTH_GSS: 576 dprintk("RPC_AUTH_GSS callback secflavor " 577 "not supported!\n"); 578 READ_BUF(8); 579 /* gcbp_service */ 580 dummy = be32_to_cpup(p++); 581 /* gcbp_handle_from_server */ 582 dummy = be32_to_cpup(p++); 583 READ_BUF(dummy); 584 p += XDR_QUADLEN(dummy); 585 /* gcbp_handle_from_client */ 586 READ_BUF(4); 587 dummy = be32_to_cpup(p++); 588 READ_BUF(dummy); 589 break; 590 default: 591 dprintk("Illegal callback secflavor\n"); 592 return nfserr_inval; 593 } 594 } 595 DECODE_TAIL; 596 } 597 598 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc) 599 { 600 DECODE_HEAD; 601 602 READ_BUF(4); 603 bc->bc_cb_program = be32_to_cpup(p++); 604 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec); 605 606 DECODE_TAIL; 607 } 608 609 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts) 610 { 611 DECODE_HEAD; 612 613 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8); 614 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN); 615 bcts->dir = be32_to_cpup(p++); 616 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker 617 * could help us figure out we should be using it. */ 618 DECODE_TAIL; 619 } 620 621 static __be32 622 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close) 623 { 624 DECODE_HEAD; 625 626 READ_BUF(4); 627 close->cl_seqid = be32_to_cpup(p++); 628 return nfsd4_decode_stateid(argp, &close->cl_stateid); 629 630 DECODE_TAIL; 631 } 632 633 634 static __be32 635 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit) 636 { 637 DECODE_HEAD; 638 639 READ_BUF(12); 640 p = xdr_decode_hyper(p, &commit->co_offset); 641 commit->co_count = be32_to_cpup(p++); 642 643 DECODE_TAIL; 644 } 645 646 static __be32 647 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) 648 { 649 DECODE_HEAD; 650 651 READ_BUF(4); 652 create->cr_type = be32_to_cpup(p++); 653 switch (create->cr_type) { 654 case NF4LNK: 655 READ_BUF(4); 656 create->cr_datalen = be32_to_cpup(p++); 657 READ_BUF(create->cr_datalen); 658 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen); 659 if (!create->cr_data) 660 return nfserr_jukebox; 661 break; 662 case NF4BLK: 663 case NF4CHR: 664 READ_BUF(8); 665 create->cr_specdata1 = be32_to_cpup(p++); 666 create->cr_specdata2 = be32_to_cpup(p++); 667 break; 668 case NF4SOCK: 669 case NF4FIFO: 670 case NF4DIR: 671 default: 672 break; 673 } 674 675 READ_BUF(4); 676 create->cr_namelen = be32_to_cpup(p++); 677 READ_BUF(create->cr_namelen); 678 SAVEMEM(create->cr_name, create->cr_namelen); 679 if ((status = check_filename(create->cr_name, create->cr_namelen))) 680 return status; 681 682 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, 683 &create->cr_acl, &create->cr_label, 684 &create->cr_umask); 685 if (status) 686 goto out; 687 688 DECODE_TAIL; 689 } 690 691 static inline __be32 692 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr) 693 { 694 return nfsd4_decode_stateid(argp, &dr->dr_stateid); 695 } 696 697 static inline __be32 698 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr) 699 { 700 return nfsd4_decode_bitmap(argp, getattr->ga_bmval); 701 } 702 703 static __be32 704 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link) 705 { 706 DECODE_HEAD; 707 708 READ_BUF(4); 709 link->li_namelen = be32_to_cpup(p++); 710 READ_BUF(link->li_namelen); 711 SAVEMEM(link->li_name, link->li_namelen); 712 if ((status = check_filename(link->li_name, link->li_namelen))) 713 return status; 714 715 DECODE_TAIL; 716 } 717 718 static __be32 719 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 720 { 721 DECODE_HEAD; 722 723 /* 724 * type, reclaim(boolean), offset, length, new_lock_owner(boolean) 725 */ 726 READ_BUF(28); 727 lock->lk_type = be32_to_cpup(p++); 728 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 729 goto xdr_error; 730 lock->lk_reclaim = be32_to_cpup(p++); 731 p = xdr_decode_hyper(p, &lock->lk_offset); 732 p = xdr_decode_hyper(p, &lock->lk_length); 733 lock->lk_is_new = be32_to_cpup(p++); 734 735 if (lock->lk_is_new) { 736 READ_BUF(4); 737 lock->lk_new_open_seqid = be32_to_cpup(p++); 738 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid); 739 if (status) 740 return status; 741 READ_BUF(8 + sizeof(clientid_t)); 742 lock->lk_new_lock_seqid = be32_to_cpup(p++); 743 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t)); 744 lock->lk_new_owner.len = be32_to_cpup(p++); 745 READ_BUF(lock->lk_new_owner.len); 746 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len); 747 } else { 748 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid); 749 if (status) 750 return status; 751 READ_BUF(4); 752 lock->lk_old_lock_seqid = be32_to_cpup(p++); 753 } 754 755 DECODE_TAIL; 756 } 757 758 static __be32 759 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt) 760 { 761 DECODE_HEAD; 762 763 READ_BUF(32); 764 lockt->lt_type = be32_to_cpup(p++); 765 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 766 goto xdr_error; 767 p = xdr_decode_hyper(p, &lockt->lt_offset); 768 p = xdr_decode_hyper(p, &lockt->lt_length); 769 COPYMEM(&lockt->lt_clientid, 8); 770 lockt->lt_owner.len = be32_to_cpup(p++); 771 READ_BUF(lockt->lt_owner.len); 772 READMEM(lockt->lt_owner.data, lockt->lt_owner.len); 773 774 DECODE_TAIL; 775 } 776 777 static __be32 778 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku) 779 { 780 DECODE_HEAD; 781 782 READ_BUF(8); 783 locku->lu_type = be32_to_cpup(p++); 784 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 785 goto xdr_error; 786 locku->lu_seqid = be32_to_cpup(p++); 787 status = nfsd4_decode_stateid(argp, &locku->lu_stateid); 788 if (status) 789 return status; 790 READ_BUF(16); 791 p = xdr_decode_hyper(p, &locku->lu_offset); 792 p = xdr_decode_hyper(p, &locku->lu_length); 793 794 DECODE_TAIL; 795 } 796 797 static __be32 798 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup) 799 { 800 DECODE_HEAD; 801 802 READ_BUF(4); 803 lookup->lo_len = be32_to_cpup(p++); 804 READ_BUF(lookup->lo_len); 805 SAVEMEM(lookup->lo_name, lookup->lo_len); 806 if ((status = check_filename(lookup->lo_name, lookup->lo_len))) 807 return status; 808 809 DECODE_TAIL; 810 } 811 812 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when) 813 { 814 __be32 *p; 815 u32 w; 816 817 READ_BUF(4); 818 w = be32_to_cpup(p++); 819 *share_access = w & NFS4_SHARE_ACCESS_MASK; 820 *deleg_want = w & NFS4_SHARE_WANT_MASK; 821 if (deleg_when) 822 *deleg_when = w & NFS4_SHARE_WHEN_MASK; 823 824 switch (w & NFS4_SHARE_ACCESS_MASK) { 825 case NFS4_SHARE_ACCESS_READ: 826 case NFS4_SHARE_ACCESS_WRITE: 827 case NFS4_SHARE_ACCESS_BOTH: 828 break; 829 default: 830 return nfserr_bad_xdr; 831 } 832 w &= ~NFS4_SHARE_ACCESS_MASK; 833 if (!w) 834 return nfs_ok; 835 if (!argp->minorversion) 836 return nfserr_bad_xdr; 837 switch (w & NFS4_SHARE_WANT_MASK) { 838 case NFS4_SHARE_WANT_NO_PREFERENCE: 839 case NFS4_SHARE_WANT_READ_DELEG: 840 case NFS4_SHARE_WANT_WRITE_DELEG: 841 case NFS4_SHARE_WANT_ANY_DELEG: 842 case NFS4_SHARE_WANT_NO_DELEG: 843 case NFS4_SHARE_WANT_CANCEL: 844 break; 845 default: 846 return nfserr_bad_xdr; 847 } 848 w &= ~NFS4_SHARE_WANT_MASK; 849 if (!w) 850 return nfs_ok; 851 852 if (!deleg_when) /* open_downgrade */ 853 return nfserr_inval; 854 switch (w) { 855 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL: 856 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED: 857 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL | 858 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED): 859 return nfs_ok; 860 } 861 xdr_error: 862 return nfserr_bad_xdr; 863 } 864 865 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x) 866 { 867 __be32 *p; 868 869 READ_BUF(4); 870 *x = be32_to_cpup(p++); 871 /* Note: unlinke access bits, deny bits may be zero. */ 872 if (*x & ~NFS4_SHARE_DENY_BOTH) 873 return nfserr_bad_xdr; 874 return nfs_ok; 875 xdr_error: 876 return nfserr_bad_xdr; 877 } 878 879 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o) 880 { 881 __be32 *p; 882 883 READ_BUF(4); 884 o->len = be32_to_cpup(p++); 885 886 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT) 887 return nfserr_bad_xdr; 888 889 READ_BUF(o->len); 890 SAVEMEM(o->data, o->len); 891 return nfs_ok; 892 xdr_error: 893 return nfserr_bad_xdr; 894 } 895 896 static __be32 897 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 898 { 899 DECODE_HEAD; 900 u32 dummy; 901 902 memset(open->op_bmval, 0, sizeof(open->op_bmval)); 903 open->op_iattr.ia_valid = 0; 904 open->op_openowner = NULL; 905 906 open->op_xdr_error = 0; 907 /* seqid, share_access, share_deny, clientid, ownerlen */ 908 READ_BUF(4); 909 open->op_seqid = be32_to_cpup(p++); 910 /* decode, yet ignore deleg_when until supported */ 911 status = nfsd4_decode_share_access(argp, &open->op_share_access, 912 &open->op_deleg_want, &dummy); 913 if (status) 914 goto xdr_error; 915 status = nfsd4_decode_share_deny(argp, &open->op_share_deny); 916 if (status) 917 goto xdr_error; 918 READ_BUF(sizeof(clientid_t)); 919 COPYMEM(&open->op_clientid, sizeof(clientid_t)); 920 status = nfsd4_decode_opaque(argp, &open->op_owner); 921 if (status) 922 goto xdr_error; 923 READ_BUF(4); 924 open->op_create = be32_to_cpup(p++); 925 switch (open->op_create) { 926 case NFS4_OPEN_NOCREATE: 927 break; 928 case NFS4_OPEN_CREATE: 929 READ_BUF(4); 930 open->op_createmode = be32_to_cpup(p++); 931 switch (open->op_createmode) { 932 case NFS4_CREATE_UNCHECKED: 933 case NFS4_CREATE_GUARDED: 934 status = nfsd4_decode_fattr(argp, open->op_bmval, 935 &open->op_iattr, &open->op_acl, &open->op_label, 936 &open->op_umask); 937 if (status) 938 goto out; 939 break; 940 case NFS4_CREATE_EXCLUSIVE: 941 READ_BUF(NFS4_VERIFIER_SIZE); 942 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE); 943 break; 944 case NFS4_CREATE_EXCLUSIVE4_1: 945 if (argp->minorversion < 1) 946 goto xdr_error; 947 READ_BUF(NFS4_VERIFIER_SIZE); 948 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE); 949 status = nfsd4_decode_fattr(argp, open->op_bmval, 950 &open->op_iattr, &open->op_acl, &open->op_label, 951 &open->op_umask); 952 if (status) 953 goto out; 954 break; 955 default: 956 goto xdr_error; 957 } 958 break; 959 default: 960 goto xdr_error; 961 } 962 963 /* open_claim */ 964 READ_BUF(4); 965 open->op_claim_type = be32_to_cpup(p++); 966 switch (open->op_claim_type) { 967 case NFS4_OPEN_CLAIM_NULL: 968 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 969 READ_BUF(4); 970 open->op_fname.len = be32_to_cpup(p++); 971 READ_BUF(open->op_fname.len); 972 SAVEMEM(open->op_fname.data, open->op_fname.len); 973 if ((status = check_filename(open->op_fname.data, open->op_fname.len))) 974 return status; 975 break; 976 case NFS4_OPEN_CLAIM_PREVIOUS: 977 READ_BUF(4); 978 open->op_delegate_type = be32_to_cpup(p++); 979 break; 980 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 981 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid); 982 if (status) 983 return status; 984 READ_BUF(4); 985 open->op_fname.len = be32_to_cpup(p++); 986 READ_BUF(open->op_fname.len); 987 SAVEMEM(open->op_fname.data, open->op_fname.len); 988 if ((status = check_filename(open->op_fname.data, open->op_fname.len))) 989 return status; 990 break; 991 case NFS4_OPEN_CLAIM_FH: 992 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 993 if (argp->minorversion < 1) 994 goto xdr_error; 995 /* void */ 996 break; 997 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 998 if (argp->minorversion < 1) 999 goto xdr_error; 1000 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid); 1001 if (status) 1002 return status; 1003 break; 1004 default: 1005 goto xdr_error; 1006 } 1007 1008 DECODE_TAIL; 1009 } 1010 1011 static __be32 1012 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf) 1013 { 1014 DECODE_HEAD; 1015 1016 if (argp->minorversion >= 1) 1017 return nfserr_notsupp; 1018 1019 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid); 1020 if (status) 1021 return status; 1022 READ_BUF(4); 1023 open_conf->oc_seqid = be32_to_cpup(p++); 1024 1025 DECODE_TAIL; 1026 } 1027 1028 static __be32 1029 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down) 1030 { 1031 DECODE_HEAD; 1032 1033 status = nfsd4_decode_stateid(argp, &open_down->od_stateid); 1034 if (status) 1035 return status; 1036 READ_BUF(4); 1037 open_down->od_seqid = be32_to_cpup(p++); 1038 status = nfsd4_decode_share_access(argp, &open_down->od_share_access, 1039 &open_down->od_deleg_want, NULL); 1040 if (status) 1041 return status; 1042 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny); 1043 if (status) 1044 return status; 1045 DECODE_TAIL; 1046 } 1047 1048 static __be32 1049 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh) 1050 { 1051 DECODE_HEAD; 1052 1053 READ_BUF(4); 1054 putfh->pf_fhlen = be32_to_cpup(p++); 1055 if (putfh->pf_fhlen > NFS4_FHSIZE) 1056 goto xdr_error; 1057 READ_BUF(putfh->pf_fhlen); 1058 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen); 1059 1060 DECODE_TAIL; 1061 } 1062 1063 static __be32 1064 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p) 1065 { 1066 if (argp->minorversion == 0) 1067 return nfs_ok; 1068 return nfserr_notsupp; 1069 } 1070 1071 static __be32 1072 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read) 1073 { 1074 DECODE_HEAD; 1075 1076 status = nfsd4_decode_stateid(argp, &read->rd_stateid); 1077 if (status) 1078 return status; 1079 READ_BUF(12); 1080 p = xdr_decode_hyper(p, &read->rd_offset); 1081 read->rd_length = be32_to_cpup(p++); 1082 1083 DECODE_TAIL; 1084 } 1085 1086 static __be32 1087 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir) 1088 { 1089 DECODE_HEAD; 1090 1091 READ_BUF(24); 1092 p = xdr_decode_hyper(p, &readdir->rd_cookie); 1093 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data)); 1094 readdir->rd_dircount = be32_to_cpup(p++); 1095 readdir->rd_maxcount = be32_to_cpup(p++); 1096 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval))) 1097 goto out; 1098 1099 DECODE_TAIL; 1100 } 1101 1102 static __be32 1103 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove) 1104 { 1105 DECODE_HEAD; 1106 1107 READ_BUF(4); 1108 remove->rm_namelen = be32_to_cpup(p++); 1109 READ_BUF(remove->rm_namelen); 1110 SAVEMEM(remove->rm_name, remove->rm_namelen); 1111 if ((status = check_filename(remove->rm_name, remove->rm_namelen))) 1112 return status; 1113 1114 DECODE_TAIL; 1115 } 1116 1117 static __be32 1118 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename) 1119 { 1120 DECODE_HEAD; 1121 1122 READ_BUF(4); 1123 rename->rn_snamelen = be32_to_cpup(p++); 1124 READ_BUF(rename->rn_snamelen); 1125 SAVEMEM(rename->rn_sname, rename->rn_snamelen); 1126 READ_BUF(4); 1127 rename->rn_tnamelen = be32_to_cpup(p++); 1128 READ_BUF(rename->rn_tnamelen); 1129 SAVEMEM(rename->rn_tname, rename->rn_tnamelen); 1130 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen))) 1131 return status; 1132 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen))) 1133 return status; 1134 1135 DECODE_TAIL; 1136 } 1137 1138 static __be32 1139 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid) 1140 { 1141 DECODE_HEAD; 1142 1143 if (argp->minorversion >= 1) 1144 return nfserr_notsupp; 1145 1146 READ_BUF(sizeof(clientid_t)); 1147 COPYMEM(clientid, sizeof(clientid_t)); 1148 1149 DECODE_TAIL; 1150 } 1151 1152 static __be32 1153 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp, 1154 struct nfsd4_secinfo *secinfo) 1155 { 1156 DECODE_HEAD; 1157 1158 READ_BUF(4); 1159 secinfo->si_namelen = be32_to_cpup(p++); 1160 READ_BUF(secinfo->si_namelen); 1161 SAVEMEM(secinfo->si_name, secinfo->si_namelen); 1162 status = check_filename(secinfo->si_name, secinfo->si_namelen); 1163 if (status) 1164 return status; 1165 DECODE_TAIL; 1166 } 1167 1168 static __be32 1169 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp, 1170 struct nfsd4_secinfo_no_name *sin) 1171 { 1172 DECODE_HEAD; 1173 1174 READ_BUF(4); 1175 sin->sin_style = be32_to_cpup(p++); 1176 DECODE_TAIL; 1177 } 1178 1179 static __be32 1180 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr) 1181 { 1182 __be32 status; 1183 1184 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid); 1185 if (status) 1186 return status; 1187 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, 1188 &setattr->sa_acl, &setattr->sa_label, NULL); 1189 } 1190 1191 static __be32 1192 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid) 1193 { 1194 DECODE_HEAD; 1195 1196 if (argp->minorversion >= 1) 1197 return nfserr_notsupp; 1198 1199 READ_BUF(NFS4_VERIFIER_SIZE); 1200 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE); 1201 1202 status = nfsd4_decode_opaque(argp, &setclientid->se_name); 1203 if (status) 1204 return nfserr_bad_xdr; 1205 READ_BUF(8); 1206 setclientid->se_callback_prog = be32_to_cpup(p++); 1207 setclientid->se_callback_netid_len = be32_to_cpup(p++); 1208 READ_BUF(setclientid->se_callback_netid_len); 1209 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len); 1210 READ_BUF(4); 1211 setclientid->se_callback_addr_len = be32_to_cpup(p++); 1212 1213 READ_BUF(setclientid->se_callback_addr_len); 1214 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len); 1215 READ_BUF(4); 1216 setclientid->se_callback_ident = be32_to_cpup(p++); 1217 1218 DECODE_TAIL; 1219 } 1220 1221 static __be32 1222 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c) 1223 { 1224 DECODE_HEAD; 1225 1226 if (argp->minorversion >= 1) 1227 return nfserr_notsupp; 1228 1229 READ_BUF(8 + NFS4_VERIFIER_SIZE); 1230 COPYMEM(&scd_c->sc_clientid, 8); 1231 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE); 1232 1233 DECODE_TAIL; 1234 } 1235 1236 /* Also used for NVERIFY */ 1237 static __be32 1238 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify) 1239 { 1240 DECODE_HEAD; 1241 1242 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval))) 1243 goto out; 1244 1245 /* For convenience's sake, we compare raw xdr'd attributes in 1246 * nfsd4_proc_verify */ 1247 1248 READ_BUF(4); 1249 verify->ve_attrlen = be32_to_cpup(p++); 1250 READ_BUF(verify->ve_attrlen); 1251 SAVEMEM(verify->ve_attrval, verify->ve_attrlen); 1252 1253 DECODE_TAIL; 1254 } 1255 1256 static __be32 1257 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) 1258 { 1259 int avail; 1260 int len; 1261 DECODE_HEAD; 1262 1263 status = nfsd4_decode_stateid(argp, &write->wr_stateid); 1264 if (status) 1265 return status; 1266 READ_BUF(16); 1267 p = xdr_decode_hyper(p, &write->wr_offset); 1268 write->wr_stable_how = be32_to_cpup(p++); 1269 if (write->wr_stable_how > NFS_FILE_SYNC) 1270 goto xdr_error; 1271 write->wr_buflen = be32_to_cpup(p++); 1272 1273 /* Sorry .. no magic macros for this.. * 1274 * READ_BUF(write->wr_buflen); 1275 * SAVEMEM(write->wr_buf, write->wr_buflen); 1276 */ 1277 avail = (char*)argp->end - (char*)argp->p; 1278 if (avail + argp->pagelen < write->wr_buflen) { 1279 dprintk("NFSD: xdr error (%s:%d)\n", 1280 __FILE__, __LINE__); 1281 goto xdr_error; 1282 } 1283 write->wr_head.iov_base = p; 1284 write->wr_head.iov_len = avail; 1285 write->wr_pagelist = argp->pagelist; 1286 1287 len = XDR_QUADLEN(write->wr_buflen) << 2; 1288 if (len >= avail) { 1289 int pages; 1290 1291 len -= avail; 1292 1293 pages = len >> PAGE_SHIFT; 1294 argp->pagelist += pages; 1295 argp->pagelen -= pages * PAGE_SIZE; 1296 len -= pages * PAGE_SIZE; 1297 1298 next_decode_page(argp); 1299 } 1300 argp->p += XDR_QUADLEN(len); 1301 1302 DECODE_TAIL; 1303 } 1304 1305 static __be32 1306 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner) 1307 { 1308 DECODE_HEAD; 1309 1310 if (argp->minorversion >= 1) 1311 return nfserr_notsupp; 1312 1313 READ_BUF(12); 1314 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t)); 1315 rlockowner->rl_owner.len = be32_to_cpup(p++); 1316 READ_BUF(rlockowner->rl_owner.len); 1317 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len); 1318 1319 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid)) 1320 return nfserr_inval; 1321 DECODE_TAIL; 1322 } 1323 1324 static __be32 1325 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp, 1326 struct nfsd4_exchange_id *exid) 1327 { 1328 int dummy, tmp; 1329 DECODE_HEAD; 1330 1331 READ_BUF(NFS4_VERIFIER_SIZE); 1332 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE); 1333 1334 status = nfsd4_decode_opaque(argp, &exid->clname); 1335 if (status) 1336 return nfserr_bad_xdr; 1337 1338 READ_BUF(4); 1339 exid->flags = be32_to_cpup(p++); 1340 1341 /* Ignore state_protect4_a */ 1342 READ_BUF(4); 1343 exid->spa_how = be32_to_cpup(p++); 1344 switch (exid->spa_how) { 1345 case SP4_NONE: 1346 break; 1347 case SP4_MACH_CRED: 1348 /* spo_must_enforce */ 1349 status = nfsd4_decode_bitmap(argp, 1350 exid->spo_must_enforce); 1351 if (status) 1352 goto out; 1353 /* spo_must_allow */ 1354 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow); 1355 if (status) 1356 goto out; 1357 break; 1358 case SP4_SSV: 1359 /* ssp_ops */ 1360 READ_BUF(4); 1361 dummy = be32_to_cpup(p++); 1362 READ_BUF(dummy * 4); 1363 p += dummy; 1364 1365 READ_BUF(4); 1366 dummy = be32_to_cpup(p++); 1367 READ_BUF(dummy * 4); 1368 p += dummy; 1369 1370 /* ssp_hash_algs<> */ 1371 READ_BUF(4); 1372 tmp = be32_to_cpup(p++); 1373 while (tmp--) { 1374 READ_BUF(4); 1375 dummy = be32_to_cpup(p++); 1376 READ_BUF(dummy); 1377 p += XDR_QUADLEN(dummy); 1378 } 1379 1380 /* ssp_encr_algs<> */ 1381 READ_BUF(4); 1382 tmp = be32_to_cpup(p++); 1383 while (tmp--) { 1384 READ_BUF(4); 1385 dummy = be32_to_cpup(p++); 1386 READ_BUF(dummy); 1387 p += XDR_QUADLEN(dummy); 1388 } 1389 1390 /* ssp_window and ssp_num_gss_handles */ 1391 READ_BUF(8); 1392 dummy = be32_to_cpup(p++); 1393 dummy = be32_to_cpup(p++); 1394 break; 1395 default: 1396 goto xdr_error; 1397 } 1398 1399 /* Ignore Implementation ID */ 1400 READ_BUF(4); /* nfs_impl_id4 array length */ 1401 dummy = be32_to_cpup(p++); 1402 1403 if (dummy > 1) 1404 goto xdr_error; 1405 1406 if (dummy == 1) { 1407 /* nii_domain */ 1408 READ_BUF(4); 1409 dummy = be32_to_cpup(p++); 1410 READ_BUF(dummy); 1411 p += XDR_QUADLEN(dummy); 1412 1413 /* nii_name */ 1414 READ_BUF(4); 1415 dummy = be32_to_cpup(p++); 1416 READ_BUF(dummy); 1417 p += XDR_QUADLEN(dummy); 1418 1419 /* nii_date */ 1420 READ_BUF(12); 1421 p += 3; 1422 } 1423 DECODE_TAIL; 1424 } 1425 1426 static __be32 1427 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, 1428 struct nfsd4_create_session *sess) 1429 { 1430 DECODE_HEAD; 1431 u32 dummy; 1432 1433 READ_BUF(16); 1434 COPYMEM(&sess->clientid, 8); 1435 sess->seqid = be32_to_cpup(p++); 1436 sess->flags = be32_to_cpup(p++); 1437 1438 /* Fore channel attrs */ 1439 READ_BUF(28); 1440 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */ 1441 sess->fore_channel.maxreq_sz = be32_to_cpup(p++); 1442 sess->fore_channel.maxresp_sz = be32_to_cpup(p++); 1443 sess->fore_channel.maxresp_cached = be32_to_cpup(p++); 1444 sess->fore_channel.maxops = be32_to_cpup(p++); 1445 sess->fore_channel.maxreqs = be32_to_cpup(p++); 1446 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++); 1447 if (sess->fore_channel.nr_rdma_attrs == 1) { 1448 READ_BUF(4); 1449 sess->fore_channel.rdma_attrs = be32_to_cpup(p++); 1450 } else if (sess->fore_channel.nr_rdma_attrs > 1) { 1451 dprintk("Too many fore channel attr bitmaps!\n"); 1452 goto xdr_error; 1453 } 1454 1455 /* Back channel attrs */ 1456 READ_BUF(28); 1457 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */ 1458 sess->back_channel.maxreq_sz = be32_to_cpup(p++); 1459 sess->back_channel.maxresp_sz = be32_to_cpup(p++); 1460 sess->back_channel.maxresp_cached = be32_to_cpup(p++); 1461 sess->back_channel.maxops = be32_to_cpup(p++); 1462 sess->back_channel.maxreqs = be32_to_cpup(p++); 1463 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++); 1464 if (sess->back_channel.nr_rdma_attrs == 1) { 1465 READ_BUF(4); 1466 sess->back_channel.rdma_attrs = be32_to_cpup(p++); 1467 } else if (sess->back_channel.nr_rdma_attrs > 1) { 1468 dprintk("Too many back channel attr bitmaps!\n"); 1469 goto xdr_error; 1470 } 1471 1472 READ_BUF(4); 1473 sess->callback_prog = be32_to_cpup(p++); 1474 nfsd4_decode_cb_sec(argp, &sess->cb_sec); 1475 DECODE_TAIL; 1476 } 1477 1478 static __be32 1479 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp, 1480 struct nfsd4_destroy_session *destroy_session) 1481 { 1482 DECODE_HEAD; 1483 READ_BUF(NFS4_MAX_SESSIONID_LEN); 1484 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN); 1485 1486 DECODE_TAIL; 1487 } 1488 1489 static __be32 1490 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp, 1491 struct nfsd4_free_stateid *free_stateid) 1492 { 1493 DECODE_HEAD; 1494 1495 READ_BUF(sizeof(stateid_t)); 1496 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++); 1497 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t)); 1498 1499 DECODE_TAIL; 1500 } 1501 1502 static __be32 1503 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp, 1504 struct nfsd4_sequence *seq) 1505 { 1506 DECODE_HEAD; 1507 1508 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); 1509 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN); 1510 seq->seqid = be32_to_cpup(p++); 1511 seq->slotid = be32_to_cpup(p++); 1512 seq->maxslots = be32_to_cpup(p++); 1513 seq->cachethis = be32_to_cpup(p++); 1514 1515 DECODE_TAIL; 1516 } 1517 1518 static __be32 1519 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid) 1520 { 1521 int i; 1522 __be32 *p, status; 1523 struct nfsd4_test_stateid_id *stateid; 1524 1525 READ_BUF(4); 1526 test_stateid->ts_num_ids = ntohl(*p++); 1527 1528 INIT_LIST_HEAD(&test_stateid->ts_stateid_list); 1529 1530 for (i = 0; i < test_stateid->ts_num_ids; i++) { 1531 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); 1532 if (!stateid) { 1533 status = nfserrno(-ENOMEM); 1534 goto out; 1535 } 1536 1537 INIT_LIST_HEAD(&stateid->ts_id_list); 1538 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); 1539 1540 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid); 1541 if (status) 1542 goto out; 1543 } 1544 1545 status = 0; 1546 out: 1547 return status; 1548 xdr_error: 1549 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__); 1550 status = nfserr_bad_xdr; 1551 goto out; 1552 } 1553 1554 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc) 1555 { 1556 DECODE_HEAD; 1557 1558 READ_BUF(8); 1559 COPYMEM(&dc->clientid, 8); 1560 1561 DECODE_TAIL; 1562 } 1563 1564 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc) 1565 { 1566 DECODE_HEAD; 1567 1568 READ_BUF(4); 1569 rc->rca_one_fs = be32_to_cpup(p++); 1570 1571 DECODE_TAIL; 1572 } 1573 1574 #ifdef CONFIG_NFSD_PNFS 1575 static __be32 1576 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp, 1577 struct nfsd4_getdeviceinfo *gdev) 1578 { 1579 DECODE_HEAD; 1580 u32 num, i; 1581 1582 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4); 1583 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid)); 1584 gdev->gd_layout_type = be32_to_cpup(p++); 1585 gdev->gd_maxcount = be32_to_cpup(p++); 1586 num = be32_to_cpup(p++); 1587 if (num) { 1588 READ_BUF(4 * num); 1589 gdev->gd_notify_types = be32_to_cpup(p++); 1590 for (i = 1; i < num; i++) { 1591 if (be32_to_cpup(p++)) { 1592 status = nfserr_inval; 1593 goto out; 1594 } 1595 } 1596 } 1597 DECODE_TAIL; 1598 } 1599 1600 static __be32 1601 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp, 1602 struct nfsd4_layoutget *lgp) 1603 { 1604 DECODE_HEAD; 1605 1606 READ_BUF(36); 1607 lgp->lg_signal = be32_to_cpup(p++); 1608 lgp->lg_layout_type = be32_to_cpup(p++); 1609 lgp->lg_seg.iomode = be32_to_cpup(p++); 1610 p = xdr_decode_hyper(p, &lgp->lg_seg.offset); 1611 p = xdr_decode_hyper(p, &lgp->lg_seg.length); 1612 p = xdr_decode_hyper(p, &lgp->lg_minlength); 1613 1614 status = nfsd4_decode_stateid(argp, &lgp->lg_sid); 1615 if (status) 1616 return status; 1617 1618 READ_BUF(4); 1619 lgp->lg_maxcount = be32_to_cpup(p++); 1620 1621 DECODE_TAIL; 1622 } 1623 1624 static __be32 1625 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp, 1626 struct nfsd4_layoutcommit *lcp) 1627 { 1628 DECODE_HEAD; 1629 u32 timechange; 1630 1631 READ_BUF(20); 1632 p = xdr_decode_hyper(p, &lcp->lc_seg.offset); 1633 p = xdr_decode_hyper(p, &lcp->lc_seg.length); 1634 lcp->lc_reclaim = be32_to_cpup(p++); 1635 1636 status = nfsd4_decode_stateid(argp, &lcp->lc_sid); 1637 if (status) 1638 return status; 1639 1640 READ_BUF(4); 1641 lcp->lc_newoffset = be32_to_cpup(p++); 1642 if (lcp->lc_newoffset) { 1643 READ_BUF(8); 1644 p = xdr_decode_hyper(p, &lcp->lc_last_wr); 1645 } else 1646 lcp->lc_last_wr = 0; 1647 READ_BUF(4); 1648 timechange = be32_to_cpup(p++); 1649 if (timechange) { 1650 status = nfsd4_decode_time(argp, &lcp->lc_mtime); 1651 if (status) 1652 return status; 1653 } else { 1654 lcp->lc_mtime.tv_nsec = UTIME_NOW; 1655 } 1656 READ_BUF(8); 1657 lcp->lc_layout_type = be32_to_cpup(p++); 1658 1659 /* 1660 * Save the layout update in XDR format and let the layout driver deal 1661 * with it later. 1662 */ 1663 lcp->lc_up_len = be32_to_cpup(p++); 1664 if (lcp->lc_up_len > 0) { 1665 READ_BUF(lcp->lc_up_len); 1666 READMEM(lcp->lc_up_layout, lcp->lc_up_len); 1667 } 1668 1669 DECODE_TAIL; 1670 } 1671 1672 static __be32 1673 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp, 1674 struct nfsd4_layoutreturn *lrp) 1675 { 1676 DECODE_HEAD; 1677 1678 READ_BUF(16); 1679 lrp->lr_reclaim = be32_to_cpup(p++); 1680 lrp->lr_layout_type = be32_to_cpup(p++); 1681 lrp->lr_seg.iomode = be32_to_cpup(p++); 1682 lrp->lr_return_type = be32_to_cpup(p++); 1683 if (lrp->lr_return_type == RETURN_FILE) { 1684 READ_BUF(16); 1685 p = xdr_decode_hyper(p, &lrp->lr_seg.offset); 1686 p = xdr_decode_hyper(p, &lrp->lr_seg.length); 1687 1688 status = nfsd4_decode_stateid(argp, &lrp->lr_sid); 1689 if (status) 1690 return status; 1691 1692 READ_BUF(4); 1693 lrp->lrf_body_len = be32_to_cpup(p++); 1694 if (lrp->lrf_body_len > 0) { 1695 READ_BUF(lrp->lrf_body_len); 1696 READMEM(lrp->lrf_body, lrp->lrf_body_len); 1697 } 1698 } else { 1699 lrp->lr_seg.offset = 0; 1700 lrp->lr_seg.length = NFS4_MAX_UINT64; 1701 } 1702 1703 DECODE_TAIL; 1704 } 1705 #endif /* CONFIG_NFSD_PNFS */ 1706 1707 static __be32 1708 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp, 1709 struct nfsd4_fallocate *fallocate) 1710 { 1711 DECODE_HEAD; 1712 1713 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid); 1714 if (status) 1715 return status; 1716 1717 READ_BUF(16); 1718 p = xdr_decode_hyper(p, &fallocate->falloc_offset); 1719 xdr_decode_hyper(p, &fallocate->falloc_length); 1720 1721 DECODE_TAIL; 1722 } 1723 1724 static __be32 1725 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone) 1726 { 1727 DECODE_HEAD; 1728 1729 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid); 1730 if (status) 1731 return status; 1732 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid); 1733 if (status) 1734 return status; 1735 1736 READ_BUF(8 + 8 + 8); 1737 p = xdr_decode_hyper(p, &clone->cl_src_pos); 1738 p = xdr_decode_hyper(p, &clone->cl_dst_pos); 1739 p = xdr_decode_hyper(p, &clone->cl_count); 1740 DECODE_TAIL; 1741 } 1742 1743 static __be32 1744 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy) 1745 { 1746 DECODE_HEAD; 1747 unsigned int tmp; 1748 1749 status = nfsd4_decode_stateid(argp, ©->cp_src_stateid); 1750 if (status) 1751 return status; 1752 status = nfsd4_decode_stateid(argp, ©->cp_dst_stateid); 1753 if (status) 1754 return status; 1755 1756 READ_BUF(8 + 8 + 8 + 4 + 4 + 4); 1757 p = xdr_decode_hyper(p, ©->cp_src_pos); 1758 p = xdr_decode_hyper(p, ©->cp_dst_pos); 1759 p = xdr_decode_hyper(p, ©->cp_count); 1760 p++; /* ca_consecutive: we always do consecutive copies */ 1761 copy->cp_synchronous = be32_to_cpup(p++); 1762 tmp = be32_to_cpup(p); /* Source server list not supported */ 1763 1764 DECODE_TAIL; 1765 } 1766 1767 static __be32 1768 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek) 1769 { 1770 DECODE_HEAD; 1771 1772 status = nfsd4_decode_stateid(argp, &seek->seek_stateid); 1773 if (status) 1774 return status; 1775 1776 READ_BUF(8 + 4); 1777 p = xdr_decode_hyper(p, &seek->seek_offset); 1778 seek->seek_whence = be32_to_cpup(p); 1779 1780 DECODE_TAIL; 1781 } 1782 1783 static __be32 1784 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p) 1785 { 1786 return nfs_ok; 1787 } 1788 1789 static __be32 1790 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p) 1791 { 1792 return nfserr_notsupp; 1793 } 1794 1795 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *); 1796 1797 static const nfsd4_dec nfsd4_dec_ops[] = { 1798 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access, 1799 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close, 1800 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit, 1801 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create, 1802 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp, 1803 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn, 1804 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr, 1805 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop, 1806 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link, 1807 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock, 1808 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt, 1809 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku, 1810 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup, 1811 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop, 1812 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify, 1813 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open, 1814 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp, 1815 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm, 1816 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade, 1817 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh, 1818 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh, 1819 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop, 1820 [OP_READ] = (nfsd4_dec)nfsd4_decode_read, 1821 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir, 1822 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop, 1823 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove, 1824 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename, 1825 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew, 1826 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop, 1827 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop, 1828 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo, 1829 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr, 1830 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid, 1831 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm, 1832 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify, 1833 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write, 1834 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner, 1835 1836 /* new operations for NFSv4.1 */ 1837 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl, 1838 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session, 1839 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id, 1840 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session, 1841 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session, 1842 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid, 1843 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 1844 #ifdef CONFIG_NFSD_PNFS 1845 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo, 1846 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 1847 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit, 1848 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget, 1849 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn, 1850 #else 1851 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp, 1852 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 1853 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp, 1854 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp, 1855 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp, 1856 #endif 1857 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name, 1858 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence, 1859 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp, 1860 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid, 1861 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 1862 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid, 1863 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete, 1864 1865 /* new operations for NFSv4.2 */ 1866 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 1867 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy, 1868 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp, 1869 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 1870 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp, 1871 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp, 1872 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp, 1873 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp, 1874 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp, 1875 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp, 1876 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek, 1877 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp, 1878 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone, 1879 }; 1880 1881 static inline bool 1882 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op) 1883 { 1884 if (op->opnum < FIRST_NFS4_OP) 1885 return false; 1886 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP) 1887 return false; 1888 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP) 1889 return false; 1890 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP) 1891 return false; 1892 return true; 1893 } 1894 1895 static __be32 1896 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 1897 { 1898 DECODE_HEAD; 1899 struct nfsd4_op *op; 1900 bool cachethis = false; 1901 int auth_slack= argp->rqstp->rq_auth_slack; 1902 int max_reply = auth_slack + 8; /* opcnt, status */ 1903 int readcount = 0; 1904 int readbytes = 0; 1905 int i; 1906 1907 READ_BUF(4); 1908 argp->taglen = be32_to_cpup(p++); 1909 READ_BUF(argp->taglen); 1910 SAVEMEM(argp->tag, argp->taglen); 1911 READ_BUF(8); 1912 argp->minorversion = be32_to_cpup(p++); 1913 argp->opcnt = be32_to_cpup(p++); 1914 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2); 1915 1916 if (argp->taglen > NFSD4_MAX_TAGLEN) 1917 goto xdr_error; 1918 /* 1919 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS 1920 * here, so we return success at the xdr level so that 1921 * nfsd4_proc can handle this is an NFS-level error. 1922 */ 1923 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND) 1924 return 0; 1925 1926 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { 1927 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); 1928 if (!argp->ops) { 1929 argp->ops = argp->iops; 1930 dprintk("nfsd: couldn't allocate room for COMPOUND\n"); 1931 goto xdr_error; 1932 } 1933 } 1934 1935 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 1936 argp->opcnt = 0; 1937 1938 for (i = 0; i < argp->opcnt; i++) { 1939 op = &argp->ops[i]; 1940 op->replay = NULL; 1941 1942 READ_BUF(4); 1943 op->opnum = be32_to_cpup(p++); 1944 1945 if (nfsd4_opnum_in_range(argp, op)) 1946 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u); 1947 else { 1948 op->opnum = OP_ILLEGAL; 1949 op->status = nfserr_op_illegal; 1950 } 1951 op->opdesc = OPDESC(op); 1952 /* 1953 * We'll try to cache the result in the DRC if any one 1954 * op in the compound wants to be cached: 1955 */ 1956 cachethis |= nfsd4_cache_this_op(op); 1957 1958 if (op->opnum == OP_READ) { 1959 readcount++; 1960 readbytes += nfsd4_max_reply(argp->rqstp, op); 1961 } else 1962 max_reply += nfsd4_max_reply(argp->rqstp, op); 1963 /* 1964 * OP_LOCK and OP_LOCKT may return a conflicting lock. 1965 * (Special case because it will just skip encoding this 1966 * if it runs out of xdr buffer space, and it is the only 1967 * operation that behaves this way.) 1968 */ 1969 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT) 1970 max_reply += NFS4_OPAQUE_LIMIT; 1971 1972 if (op->status) { 1973 argp->opcnt = i+1; 1974 break; 1975 } 1976 } 1977 /* Sessions make the DRC unnecessary: */ 1978 if (argp->minorversion) 1979 cachethis = false; 1980 svc_reserve(argp->rqstp, max_reply + readbytes); 1981 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE; 1982 1983 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack) 1984 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags); 1985 1986 DECODE_TAIL; 1987 } 1988 1989 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode, 1990 struct svc_export *exp) 1991 { 1992 if (exp->ex_flags & NFSEXP_V4ROOT) { 1993 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time)); 1994 *p++ = 0; 1995 } else if (IS_I_VERSION(inode)) { 1996 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode)); 1997 } else { 1998 *p++ = cpu_to_be32(stat->ctime.tv_sec); 1999 *p++ = cpu_to_be32(stat->ctime.tv_nsec); 2000 } 2001 return p; 2002 } 2003 2004 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c) 2005 { 2006 *p++ = cpu_to_be32(c->atomic); 2007 if (c->change_supported) { 2008 p = xdr_encode_hyper(p, c->before_change); 2009 p = xdr_encode_hyper(p, c->after_change); 2010 } else { 2011 *p++ = cpu_to_be32(c->before_ctime_sec); 2012 *p++ = cpu_to_be32(c->before_ctime_nsec); 2013 *p++ = cpu_to_be32(c->after_ctime_sec); 2014 *p++ = cpu_to_be32(c->after_ctime_nsec); 2015 } 2016 return p; 2017 } 2018 2019 /* Encode as an array of strings the string given with components 2020 * separated @sep, escaped with esc_enter and esc_exit. 2021 */ 2022 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep, 2023 char *components, char esc_enter, 2024 char esc_exit) 2025 { 2026 __be32 *p; 2027 __be32 pathlen; 2028 int pathlen_offset; 2029 int strlen, count=0; 2030 char *str, *end, *next; 2031 2032 dprintk("nfsd4_encode_components(%s)\n", components); 2033 2034 pathlen_offset = xdr->buf->len; 2035 p = xdr_reserve_space(xdr, 4); 2036 if (!p) 2037 return nfserr_resource; 2038 p++; /* We will fill this in with @count later */ 2039 2040 end = str = components; 2041 while (*end) { 2042 bool found_esc = false; 2043 2044 /* try to parse as esc_start, ..., esc_end, sep */ 2045 if (*str == esc_enter) { 2046 for (; *end && (*end != esc_exit); end++) 2047 /* find esc_exit or end of string */; 2048 next = end + 1; 2049 if (*end && (!*next || *next == sep)) { 2050 str++; 2051 found_esc = true; 2052 } 2053 } 2054 2055 if (!found_esc) 2056 for (; *end && (*end != sep); end++) 2057 /* find sep or end of string */; 2058 2059 strlen = end - str; 2060 if (strlen) { 2061 p = xdr_reserve_space(xdr, strlen + 4); 2062 if (!p) 2063 return nfserr_resource; 2064 p = xdr_encode_opaque(p, str, strlen); 2065 count++; 2066 } 2067 else 2068 end++; 2069 if (found_esc) 2070 end = next; 2071 2072 str = end; 2073 } 2074 pathlen = htonl(count); 2075 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4); 2076 return 0; 2077 } 2078 2079 /* Encode as an array of strings the string given with components 2080 * separated @sep. 2081 */ 2082 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep, 2083 char *components) 2084 { 2085 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0); 2086 } 2087 2088 /* 2089 * encode a location element of a fs_locations structure 2090 */ 2091 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr, 2092 struct nfsd4_fs_location *location) 2093 { 2094 __be32 status; 2095 2096 status = nfsd4_encode_components_esc(xdr, ':', location->hosts, 2097 '[', ']'); 2098 if (status) 2099 return status; 2100 status = nfsd4_encode_components(xdr, '/', location->path); 2101 if (status) 2102 return status; 2103 return 0; 2104 } 2105 2106 /* 2107 * Encode a path in RFC3530 'pathname4' format 2108 */ 2109 static __be32 nfsd4_encode_path(struct xdr_stream *xdr, 2110 const struct path *root, 2111 const struct path *path) 2112 { 2113 struct path cur = *path; 2114 __be32 *p; 2115 struct dentry **components = NULL; 2116 unsigned int ncomponents = 0; 2117 __be32 err = nfserr_jukebox; 2118 2119 dprintk("nfsd4_encode_components("); 2120 2121 path_get(&cur); 2122 /* First walk the path up to the nfsd root, and store the 2123 * dentries/path components in an array. 2124 */ 2125 for (;;) { 2126 if (path_equal(&cur, root)) 2127 break; 2128 if (cur.dentry == cur.mnt->mnt_root) { 2129 if (follow_up(&cur)) 2130 continue; 2131 goto out_free; 2132 } 2133 if ((ncomponents & 15) == 0) { 2134 struct dentry **new; 2135 new = krealloc(components, 2136 sizeof(*new) * (ncomponents + 16), 2137 GFP_KERNEL); 2138 if (!new) 2139 goto out_free; 2140 components = new; 2141 } 2142 components[ncomponents++] = cur.dentry; 2143 cur.dentry = dget_parent(cur.dentry); 2144 } 2145 err = nfserr_resource; 2146 p = xdr_reserve_space(xdr, 4); 2147 if (!p) 2148 goto out_free; 2149 *p++ = cpu_to_be32(ncomponents); 2150 2151 while (ncomponents) { 2152 struct dentry *dentry = components[ncomponents - 1]; 2153 unsigned int len; 2154 2155 spin_lock(&dentry->d_lock); 2156 len = dentry->d_name.len; 2157 p = xdr_reserve_space(xdr, len + 4); 2158 if (!p) { 2159 spin_unlock(&dentry->d_lock); 2160 goto out_free; 2161 } 2162 p = xdr_encode_opaque(p, dentry->d_name.name, len); 2163 dprintk("/%pd", dentry); 2164 spin_unlock(&dentry->d_lock); 2165 dput(dentry); 2166 ncomponents--; 2167 } 2168 2169 err = 0; 2170 out_free: 2171 dprintk(")\n"); 2172 while (ncomponents) 2173 dput(components[--ncomponents]); 2174 kfree(components); 2175 path_put(&cur); 2176 return err; 2177 } 2178 2179 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr, 2180 struct svc_rqst *rqstp, const struct path *path) 2181 { 2182 struct svc_export *exp_ps; 2183 __be32 res; 2184 2185 exp_ps = rqst_find_fsidzero_export(rqstp); 2186 if (IS_ERR(exp_ps)) 2187 return nfserrno(PTR_ERR(exp_ps)); 2188 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path); 2189 exp_put(exp_ps); 2190 return res; 2191 } 2192 2193 /* 2194 * encode a fs_locations structure 2195 */ 2196 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr, 2197 struct svc_rqst *rqstp, struct svc_export *exp) 2198 { 2199 __be32 status; 2200 int i; 2201 __be32 *p; 2202 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; 2203 2204 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path); 2205 if (status) 2206 return status; 2207 p = xdr_reserve_space(xdr, 4); 2208 if (!p) 2209 return nfserr_resource; 2210 *p++ = cpu_to_be32(fslocs->locations_count); 2211 for (i=0; i<fslocs->locations_count; i++) { 2212 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]); 2213 if (status) 2214 return status; 2215 } 2216 return 0; 2217 } 2218 2219 static u32 nfs4_file_type(umode_t mode) 2220 { 2221 switch (mode & S_IFMT) { 2222 case S_IFIFO: return NF4FIFO; 2223 case S_IFCHR: return NF4CHR; 2224 case S_IFDIR: return NF4DIR; 2225 case S_IFBLK: return NF4BLK; 2226 case S_IFLNK: return NF4LNK; 2227 case S_IFREG: return NF4REG; 2228 case S_IFSOCK: return NF4SOCK; 2229 default: return NF4BAD; 2230 }; 2231 } 2232 2233 static inline __be32 2234 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2235 struct nfs4_ace *ace) 2236 { 2237 if (ace->whotype != NFS4_ACL_WHO_NAMED) 2238 return nfs4_acl_write_who(xdr, ace->whotype); 2239 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 2240 return nfsd4_encode_group(xdr, rqstp, ace->who_gid); 2241 else 2242 return nfsd4_encode_user(xdr, rqstp, ace->who_uid); 2243 } 2244 2245 static inline __be32 2246 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types) 2247 { 2248 __be32 *p; 2249 unsigned long i = hweight_long(layout_types); 2250 2251 p = xdr_reserve_space(xdr, 4 + 4 * i); 2252 if (!p) 2253 return nfserr_resource; 2254 2255 *p++ = cpu_to_be32(i); 2256 2257 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 2258 if (layout_types & (1 << i)) 2259 *p++ = cpu_to_be32(i); 2260 2261 return 0; 2262 } 2263 2264 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ 2265 FATTR4_WORD0_RDATTR_ERROR) 2266 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID 2267 #define WORD2_ABSENT_FS_ATTRS 0 2268 2269 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2270 static inline __be32 2271 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2272 void *context, int len) 2273 { 2274 __be32 *p; 2275 2276 p = xdr_reserve_space(xdr, len + 4 + 4 + 4); 2277 if (!p) 2278 return nfserr_resource; 2279 2280 /* 2281 * For now we use a 0 here to indicate the null translation; in 2282 * the future we may place a call to translation code here. 2283 */ 2284 *p++ = cpu_to_be32(0); /* lfs */ 2285 *p++ = cpu_to_be32(0); /* pi */ 2286 p = xdr_encode_opaque(p, context, len); 2287 return 0; 2288 } 2289 #else 2290 static inline __be32 2291 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2292 void *context, int len) 2293 { return 0; } 2294 #endif 2295 2296 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err) 2297 { 2298 /* As per referral draft: */ 2299 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || 2300 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { 2301 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || 2302 *bmval0 & FATTR4_WORD0_FS_LOCATIONS) 2303 *rdattr_err = NFSERR_MOVED; 2304 else 2305 return nfserr_moved; 2306 } 2307 *bmval0 &= WORD0_ABSENT_FS_ATTRS; 2308 *bmval1 &= WORD1_ABSENT_FS_ATTRS; 2309 *bmval2 &= WORD2_ABSENT_FS_ATTRS; 2310 return 0; 2311 } 2312 2313 2314 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat) 2315 { 2316 struct path path = exp->ex_path; 2317 int err; 2318 2319 path_get(&path); 2320 while (follow_up(&path)) { 2321 if (path.dentry != path.mnt->mnt_root) 2322 break; 2323 } 2324 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2325 path_put(&path); 2326 return err; 2327 } 2328 2329 static __be32 2330 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2) 2331 { 2332 __be32 *p; 2333 2334 if (bmval2) { 2335 p = xdr_reserve_space(xdr, 16); 2336 if (!p) 2337 goto out_resource; 2338 *p++ = cpu_to_be32(3); 2339 *p++ = cpu_to_be32(bmval0); 2340 *p++ = cpu_to_be32(bmval1); 2341 *p++ = cpu_to_be32(bmval2); 2342 } else if (bmval1) { 2343 p = xdr_reserve_space(xdr, 12); 2344 if (!p) 2345 goto out_resource; 2346 *p++ = cpu_to_be32(2); 2347 *p++ = cpu_to_be32(bmval0); 2348 *p++ = cpu_to_be32(bmval1); 2349 } else { 2350 p = xdr_reserve_space(xdr, 8); 2351 if (!p) 2352 goto out_resource; 2353 *p++ = cpu_to_be32(1); 2354 *p++ = cpu_to_be32(bmval0); 2355 } 2356 2357 return 0; 2358 out_resource: 2359 return nfserr_resource; 2360 } 2361 2362 /* 2363 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 2364 * ourselves. 2365 */ 2366 static __be32 2367 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, 2368 struct svc_export *exp, 2369 struct dentry *dentry, u32 *bmval, 2370 struct svc_rqst *rqstp, int ignore_crossmnt) 2371 { 2372 u32 bmval0 = bmval[0]; 2373 u32 bmval1 = bmval[1]; 2374 u32 bmval2 = bmval[2]; 2375 struct kstat stat; 2376 struct svc_fh *tempfh = NULL; 2377 struct kstatfs statfs; 2378 __be32 *p; 2379 int starting_len = xdr->buf->len; 2380 int attrlen_offset; 2381 __be32 attrlen; 2382 u32 dummy; 2383 u64 dummy64; 2384 u32 rdattr_err = 0; 2385 __be32 status; 2386 int err; 2387 struct nfs4_acl *acl = NULL; 2388 void *context = NULL; 2389 int contextlen; 2390 bool contextsupport = false; 2391 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2392 u32 minorversion = resp->cstate.minorversion; 2393 struct path path = { 2394 .mnt = exp->ex_path.mnt, 2395 .dentry = dentry, 2396 }; 2397 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2398 2399 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); 2400 BUG_ON(!nfsd_attrs_supported(minorversion, bmval)); 2401 2402 if (exp->ex_fslocs.migrated) { 2403 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err); 2404 if (status) 2405 goto out; 2406 } 2407 2408 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2409 if (err) 2410 goto out_nfserr; 2411 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE | 2412 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || 2413 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 2414 FATTR4_WORD1_SPACE_TOTAL))) { 2415 err = vfs_statfs(&path, &statfs); 2416 if (err) 2417 goto out_nfserr; 2418 } 2419 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { 2420 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); 2421 status = nfserr_jukebox; 2422 if (!tempfh) 2423 goto out; 2424 fh_init(tempfh, NFS4_FHSIZE); 2425 status = fh_compose(tempfh, exp, dentry, NULL); 2426 if (status) 2427 goto out; 2428 fhp = tempfh; 2429 } 2430 if (bmval0 & FATTR4_WORD0_ACL) { 2431 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); 2432 if (err == -EOPNOTSUPP) 2433 bmval0 &= ~FATTR4_WORD0_ACL; 2434 else if (err == -EINVAL) { 2435 status = nfserr_attrnotsupp; 2436 goto out; 2437 } else if (err != 0) 2438 goto out_nfserr; 2439 } 2440 2441 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2442 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) || 2443 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2444 if (exp->ex_flags & NFSEXP_SECURITY_LABEL) 2445 err = security_inode_getsecctx(d_inode(dentry), 2446 &context, &contextlen); 2447 else 2448 err = -EOPNOTSUPP; 2449 contextsupport = (err == 0); 2450 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2451 if (err == -EOPNOTSUPP) 2452 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL; 2453 else if (err) 2454 goto out_nfserr; 2455 } 2456 } 2457 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2458 2459 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2); 2460 if (status) 2461 goto out; 2462 2463 attrlen_offset = xdr->buf->len; 2464 p = xdr_reserve_space(xdr, 4); 2465 if (!p) 2466 goto out_resource; 2467 p++; /* to be backfilled later */ 2468 2469 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2470 u32 supp[3]; 2471 2472 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2473 2474 if (!IS_POSIXACL(dentry->d_inode)) 2475 supp[0] &= ~FATTR4_WORD0_ACL; 2476 if (!contextsupport) 2477 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2478 if (!supp[2]) { 2479 p = xdr_reserve_space(xdr, 12); 2480 if (!p) 2481 goto out_resource; 2482 *p++ = cpu_to_be32(2); 2483 *p++ = cpu_to_be32(supp[0]); 2484 *p++ = cpu_to_be32(supp[1]); 2485 } else { 2486 p = xdr_reserve_space(xdr, 16); 2487 if (!p) 2488 goto out_resource; 2489 *p++ = cpu_to_be32(3); 2490 *p++ = cpu_to_be32(supp[0]); 2491 *p++ = cpu_to_be32(supp[1]); 2492 *p++ = cpu_to_be32(supp[2]); 2493 } 2494 } 2495 if (bmval0 & FATTR4_WORD0_TYPE) { 2496 p = xdr_reserve_space(xdr, 4); 2497 if (!p) 2498 goto out_resource; 2499 dummy = nfs4_file_type(stat.mode); 2500 if (dummy == NF4BAD) { 2501 status = nfserr_serverfault; 2502 goto out; 2503 } 2504 *p++ = cpu_to_be32(dummy); 2505 } 2506 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { 2507 p = xdr_reserve_space(xdr, 4); 2508 if (!p) 2509 goto out_resource; 2510 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 2511 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT); 2512 else 2513 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT| 2514 NFS4_FH_VOL_RENAME); 2515 } 2516 if (bmval0 & FATTR4_WORD0_CHANGE) { 2517 p = xdr_reserve_space(xdr, 8); 2518 if (!p) 2519 goto out_resource; 2520 p = encode_change(p, &stat, d_inode(dentry), exp); 2521 } 2522 if (bmval0 & FATTR4_WORD0_SIZE) { 2523 p = xdr_reserve_space(xdr, 8); 2524 if (!p) 2525 goto out_resource; 2526 p = xdr_encode_hyper(p, stat.size); 2527 } 2528 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { 2529 p = xdr_reserve_space(xdr, 4); 2530 if (!p) 2531 goto out_resource; 2532 *p++ = cpu_to_be32(1); 2533 } 2534 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { 2535 p = xdr_reserve_space(xdr, 4); 2536 if (!p) 2537 goto out_resource; 2538 *p++ = cpu_to_be32(1); 2539 } 2540 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { 2541 p = xdr_reserve_space(xdr, 4); 2542 if (!p) 2543 goto out_resource; 2544 *p++ = cpu_to_be32(0); 2545 } 2546 if (bmval0 & FATTR4_WORD0_FSID) { 2547 p = xdr_reserve_space(xdr, 16); 2548 if (!p) 2549 goto out_resource; 2550 if (exp->ex_fslocs.migrated) { 2551 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR); 2552 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR); 2553 } else switch(fsid_source(fhp)) { 2554 case FSIDSOURCE_FSID: 2555 p = xdr_encode_hyper(p, (u64)exp->ex_fsid); 2556 p = xdr_encode_hyper(p, (u64)0); 2557 break; 2558 case FSIDSOURCE_DEV: 2559 *p++ = cpu_to_be32(0); 2560 *p++ = cpu_to_be32(MAJOR(stat.dev)); 2561 *p++ = cpu_to_be32(0); 2562 *p++ = cpu_to_be32(MINOR(stat.dev)); 2563 break; 2564 case FSIDSOURCE_UUID: 2565 p = xdr_encode_opaque_fixed(p, exp->ex_uuid, 2566 EX_UUID_LEN); 2567 break; 2568 } 2569 } 2570 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { 2571 p = xdr_reserve_space(xdr, 4); 2572 if (!p) 2573 goto out_resource; 2574 *p++ = cpu_to_be32(0); 2575 } 2576 if (bmval0 & FATTR4_WORD0_LEASE_TIME) { 2577 p = xdr_reserve_space(xdr, 4); 2578 if (!p) 2579 goto out_resource; 2580 *p++ = cpu_to_be32(nn->nfsd4_lease); 2581 } 2582 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { 2583 p = xdr_reserve_space(xdr, 4); 2584 if (!p) 2585 goto out_resource; 2586 *p++ = cpu_to_be32(rdattr_err); 2587 } 2588 if (bmval0 & FATTR4_WORD0_ACL) { 2589 struct nfs4_ace *ace; 2590 2591 if (acl == NULL) { 2592 p = xdr_reserve_space(xdr, 4); 2593 if (!p) 2594 goto out_resource; 2595 2596 *p++ = cpu_to_be32(0); 2597 goto out_acl; 2598 } 2599 p = xdr_reserve_space(xdr, 4); 2600 if (!p) 2601 goto out_resource; 2602 *p++ = cpu_to_be32(acl->naces); 2603 2604 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 2605 p = xdr_reserve_space(xdr, 4*3); 2606 if (!p) 2607 goto out_resource; 2608 *p++ = cpu_to_be32(ace->type); 2609 *p++ = cpu_to_be32(ace->flag); 2610 *p++ = cpu_to_be32(ace->access_mask & 2611 NFS4_ACE_MASK_ALL); 2612 status = nfsd4_encode_aclname(xdr, rqstp, ace); 2613 if (status) 2614 goto out; 2615 } 2616 } 2617 out_acl: 2618 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { 2619 p = xdr_reserve_space(xdr, 4); 2620 if (!p) 2621 goto out_resource; 2622 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ? 2623 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); 2624 } 2625 if (bmval0 & FATTR4_WORD0_CANSETTIME) { 2626 p = xdr_reserve_space(xdr, 4); 2627 if (!p) 2628 goto out_resource; 2629 *p++ = cpu_to_be32(1); 2630 } 2631 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { 2632 p = xdr_reserve_space(xdr, 4); 2633 if (!p) 2634 goto out_resource; 2635 *p++ = cpu_to_be32(0); 2636 } 2637 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { 2638 p = xdr_reserve_space(xdr, 4); 2639 if (!p) 2640 goto out_resource; 2641 *p++ = cpu_to_be32(1); 2642 } 2643 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { 2644 p = xdr_reserve_space(xdr, 4); 2645 if (!p) 2646 goto out_resource; 2647 *p++ = cpu_to_be32(1); 2648 } 2649 if (bmval0 & FATTR4_WORD0_FILEHANDLE) { 2650 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4); 2651 if (!p) 2652 goto out_resource; 2653 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, 2654 fhp->fh_handle.fh_size); 2655 } 2656 if (bmval0 & FATTR4_WORD0_FILEID) { 2657 p = xdr_reserve_space(xdr, 8); 2658 if (!p) 2659 goto out_resource; 2660 p = xdr_encode_hyper(p, stat.ino); 2661 } 2662 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { 2663 p = xdr_reserve_space(xdr, 8); 2664 if (!p) 2665 goto out_resource; 2666 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 2667 } 2668 if (bmval0 & FATTR4_WORD0_FILES_FREE) { 2669 p = xdr_reserve_space(xdr, 8); 2670 if (!p) 2671 goto out_resource; 2672 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 2673 } 2674 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { 2675 p = xdr_reserve_space(xdr, 8); 2676 if (!p) 2677 goto out_resource; 2678 p = xdr_encode_hyper(p, (u64) statfs.f_files); 2679 } 2680 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) { 2681 status = nfsd4_encode_fs_locations(xdr, rqstp, exp); 2682 if (status) 2683 goto out; 2684 } 2685 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { 2686 p = xdr_reserve_space(xdr, 4); 2687 if (!p) 2688 goto out_resource; 2689 *p++ = cpu_to_be32(1); 2690 } 2691 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { 2692 p = xdr_reserve_space(xdr, 8); 2693 if (!p) 2694 goto out_resource; 2695 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes); 2696 } 2697 if (bmval0 & FATTR4_WORD0_MAXLINK) { 2698 p = xdr_reserve_space(xdr, 4); 2699 if (!p) 2700 goto out_resource; 2701 *p++ = cpu_to_be32(255); 2702 } 2703 if (bmval0 & FATTR4_WORD0_MAXNAME) { 2704 p = xdr_reserve_space(xdr, 4); 2705 if (!p) 2706 goto out_resource; 2707 *p++ = cpu_to_be32(statfs.f_namelen); 2708 } 2709 if (bmval0 & FATTR4_WORD0_MAXREAD) { 2710 p = xdr_reserve_space(xdr, 8); 2711 if (!p) 2712 goto out_resource; 2713 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 2714 } 2715 if (bmval0 & FATTR4_WORD0_MAXWRITE) { 2716 p = xdr_reserve_space(xdr, 8); 2717 if (!p) 2718 goto out_resource; 2719 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 2720 } 2721 if (bmval1 & FATTR4_WORD1_MODE) { 2722 p = xdr_reserve_space(xdr, 4); 2723 if (!p) 2724 goto out_resource; 2725 *p++ = cpu_to_be32(stat.mode & S_IALLUGO); 2726 } 2727 if (bmval1 & FATTR4_WORD1_NO_TRUNC) { 2728 p = xdr_reserve_space(xdr, 4); 2729 if (!p) 2730 goto out_resource; 2731 *p++ = cpu_to_be32(1); 2732 } 2733 if (bmval1 & FATTR4_WORD1_NUMLINKS) { 2734 p = xdr_reserve_space(xdr, 4); 2735 if (!p) 2736 goto out_resource; 2737 *p++ = cpu_to_be32(stat.nlink); 2738 } 2739 if (bmval1 & FATTR4_WORD1_OWNER) { 2740 status = nfsd4_encode_user(xdr, rqstp, stat.uid); 2741 if (status) 2742 goto out; 2743 } 2744 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { 2745 status = nfsd4_encode_group(xdr, rqstp, stat.gid); 2746 if (status) 2747 goto out; 2748 } 2749 if (bmval1 & FATTR4_WORD1_RAWDEV) { 2750 p = xdr_reserve_space(xdr, 8); 2751 if (!p) 2752 goto out_resource; 2753 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev)); 2754 *p++ = cpu_to_be32((u32) MINOR(stat.rdev)); 2755 } 2756 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { 2757 p = xdr_reserve_space(xdr, 8); 2758 if (!p) 2759 goto out_resource; 2760 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; 2761 p = xdr_encode_hyper(p, dummy64); 2762 } 2763 if (bmval1 & FATTR4_WORD1_SPACE_FREE) { 2764 p = xdr_reserve_space(xdr, 8); 2765 if (!p) 2766 goto out_resource; 2767 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; 2768 p = xdr_encode_hyper(p, dummy64); 2769 } 2770 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { 2771 p = xdr_reserve_space(xdr, 8); 2772 if (!p) 2773 goto out_resource; 2774 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; 2775 p = xdr_encode_hyper(p, dummy64); 2776 } 2777 if (bmval1 & FATTR4_WORD1_SPACE_USED) { 2778 p = xdr_reserve_space(xdr, 8); 2779 if (!p) 2780 goto out_resource; 2781 dummy64 = (u64)stat.blocks << 9; 2782 p = xdr_encode_hyper(p, dummy64); 2783 } 2784 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { 2785 p = xdr_reserve_space(xdr, 12); 2786 if (!p) 2787 goto out_resource; 2788 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec); 2789 *p++ = cpu_to_be32(stat.atime.tv_nsec); 2790 } 2791 if (bmval1 & FATTR4_WORD1_TIME_DELTA) { 2792 p = xdr_reserve_space(xdr, 12); 2793 if (!p) 2794 goto out_resource; 2795 *p++ = cpu_to_be32(0); 2796 *p++ = cpu_to_be32(1); 2797 *p++ = cpu_to_be32(0); 2798 } 2799 if (bmval1 & FATTR4_WORD1_TIME_METADATA) { 2800 p = xdr_reserve_space(xdr, 12); 2801 if (!p) 2802 goto out_resource; 2803 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec); 2804 *p++ = cpu_to_be32(stat.ctime.tv_nsec); 2805 } 2806 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { 2807 p = xdr_reserve_space(xdr, 12); 2808 if (!p) 2809 goto out_resource; 2810 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec); 2811 *p++ = cpu_to_be32(stat.mtime.tv_nsec); 2812 } 2813 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { 2814 struct kstat parent_stat; 2815 u64 ino = stat.ino; 2816 2817 p = xdr_reserve_space(xdr, 8); 2818 if (!p) 2819 goto out_resource; 2820 /* 2821 * Get parent's attributes if not ignoring crossmount 2822 * and this is the root of a cross-mounted filesystem. 2823 */ 2824 if (ignore_crossmnt == 0 && 2825 dentry == exp->ex_path.mnt->mnt_root) { 2826 err = get_parent_attributes(exp, &parent_stat); 2827 if (err) 2828 goto out_nfserr; 2829 ino = parent_stat.ino; 2830 } 2831 p = xdr_encode_hyper(p, ino); 2832 } 2833 #ifdef CONFIG_NFSD_PNFS 2834 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) { 2835 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 2836 if (status) 2837 goto out; 2838 } 2839 2840 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) { 2841 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 2842 if (status) 2843 goto out; 2844 } 2845 2846 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) { 2847 p = xdr_reserve_space(xdr, 4); 2848 if (!p) 2849 goto out_resource; 2850 *p++ = cpu_to_be32(stat.blksize); 2851 } 2852 #endif /* CONFIG_NFSD_PNFS */ 2853 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) { 2854 u32 supp[3]; 2855 2856 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2857 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0; 2858 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1; 2859 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2; 2860 2861 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]); 2862 if (status) 2863 goto out; 2864 } 2865 2866 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2867 status = nfsd4_encode_security_label(xdr, rqstp, context, 2868 contextlen); 2869 if (status) 2870 goto out; 2871 } 2872 2873 attrlen = htonl(xdr->buf->len - attrlen_offset - 4); 2874 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4); 2875 status = nfs_ok; 2876 2877 out: 2878 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2879 if (context) 2880 security_release_secctx(context, contextlen); 2881 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2882 kfree(acl); 2883 if (tempfh) { 2884 fh_put(tempfh); 2885 kfree(tempfh); 2886 } 2887 if (status) 2888 xdr_truncate_encode(xdr, starting_len); 2889 return status; 2890 out_nfserr: 2891 status = nfserrno(err); 2892 goto out; 2893 out_resource: 2894 status = nfserr_resource; 2895 goto out; 2896 } 2897 2898 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, 2899 struct xdr_buf *buf, __be32 *p, int bytes) 2900 { 2901 xdr->scratch.iov_len = 0; 2902 memset(buf, 0, sizeof(struct xdr_buf)); 2903 buf->head[0].iov_base = p; 2904 buf->head[0].iov_len = 0; 2905 buf->len = 0; 2906 xdr->buf = buf; 2907 xdr->iov = buf->head; 2908 xdr->p = p; 2909 xdr->end = (void *)p + bytes; 2910 buf->buflen = bytes; 2911 } 2912 2913 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, 2914 struct svc_fh *fhp, struct svc_export *exp, 2915 struct dentry *dentry, u32 *bmval, 2916 struct svc_rqst *rqstp, int ignore_crossmnt) 2917 { 2918 struct xdr_buf dummy; 2919 struct xdr_stream xdr; 2920 __be32 ret; 2921 2922 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); 2923 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp, 2924 ignore_crossmnt); 2925 *p = xdr.p; 2926 return ret; 2927 } 2928 2929 static inline int attributes_need_mount(u32 *bmval) 2930 { 2931 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) 2932 return 1; 2933 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) 2934 return 1; 2935 return 0; 2936 } 2937 2938 static __be32 2939 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd, 2940 const char *name, int namlen) 2941 { 2942 struct svc_export *exp = cd->rd_fhp->fh_export; 2943 struct dentry *dentry; 2944 __be32 nfserr; 2945 int ignore_crossmnt = 0; 2946 2947 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen); 2948 if (IS_ERR(dentry)) 2949 return nfserrno(PTR_ERR(dentry)); 2950 if (d_really_is_negative(dentry)) { 2951 /* 2952 * we're not holding the i_mutex here, so there's 2953 * a window where this directory entry could have gone 2954 * away. 2955 */ 2956 dput(dentry); 2957 return nfserr_noent; 2958 } 2959 2960 exp_get(exp); 2961 /* 2962 * In the case of a mountpoint, the client may be asking for 2963 * attributes that are only properties of the underlying filesystem 2964 * as opposed to the cross-mounted file system. In such a case, 2965 * we will not follow the cross mount and will fill the attribtutes 2966 * directly from the mountpoint dentry. 2967 */ 2968 if (nfsd_mountpoint(dentry, exp)) { 2969 int err; 2970 2971 if (!(exp->ex_flags & NFSEXP_V4ROOT) 2972 && !attributes_need_mount(cd->rd_bmval)) { 2973 ignore_crossmnt = 1; 2974 goto out_encode; 2975 } 2976 /* 2977 * Why the heck aren't we just using nfsd_lookup?? 2978 * Different "."/".." handling? Something else? 2979 * At least, add a comment here to explain.... 2980 */ 2981 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); 2982 if (err) { 2983 nfserr = nfserrno(err); 2984 goto out_put; 2985 } 2986 nfserr = check_nfsd_access(exp, cd->rd_rqstp); 2987 if (nfserr) 2988 goto out_put; 2989 2990 } 2991 out_encode: 2992 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval, 2993 cd->rd_rqstp, ignore_crossmnt); 2994 out_put: 2995 dput(dentry); 2996 exp_put(exp); 2997 return nfserr; 2998 } 2999 3000 static __be32 * 3001 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr) 3002 { 3003 __be32 *p; 3004 3005 p = xdr_reserve_space(xdr, 20); 3006 if (!p) 3007 return NULL; 3008 *p++ = htonl(2); 3009 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ 3010 *p++ = htonl(0); /* bmval1 */ 3011 3012 *p++ = htonl(4); /* attribute length */ 3013 *p++ = nfserr; /* no htonl */ 3014 return p; 3015 } 3016 3017 static int 3018 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen, 3019 loff_t offset, u64 ino, unsigned int d_type) 3020 { 3021 struct readdir_cd *ccd = ccdv; 3022 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 3023 struct xdr_stream *xdr = cd->xdr; 3024 int start_offset = xdr->buf->len; 3025 int cookie_offset; 3026 u32 name_and_cookie; 3027 int entry_bytes; 3028 __be32 nfserr = nfserr_toosmall; 3029 __be64 wire_offset; 3030 __be32 *p; 3031 3032 /* In nfsv4, "." and ".." never make it onto the wire.. */ 3033 if (name && isdotent(name, namlen)) { 3034 cd->common.err = nfs_ok; 3035 return 0; 3036 } 3037 3038 if (cd->cookie_offset) { 3039 wire_offset = cpu_to_be64(offset); 3040 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset, 3041 &wire_offset, 8); 3042 } 3043 3044 p = xdr_reserve_space(xdr, 4); 3045 if (!p) 3046 goto fail; 3047 *p++ = xdr_one; /* mark entry present */ 3048 cookie_offset = xdr->buf->len; 3049 p = xdr_reserve_space(xdr, 3*4 + namlen); 3050 if (!p) 3051 goto fail; 3052 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */ 3053 p = xdr_encode_array(p, name, namlen); /* name length & name */ 3054 3055 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen); 3056 switch (nfserr) { 3057 case nfs_ok: 3058 break; 3059 case nfserr_resource: 3060 nfserr = nfserr_toosmall; 3061 goto fail; 3062 case nfserr_noent: 3063 xdr_truncate_encode(xdr, start_offset); 3064 goto skip_entry; 3065 default: 3066 /* 3067 * If the client requested the RDATTR_ERROR attribute, 3068 * we stuff the error code into this attribute 3069 * and continue. If this attribute was not requested, 3070 * then in accordance with the spec, we fail the 3071 * entire READDIR operation(!) 3072 */ 3073 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 3074 goto fail; 3075 p = nfsd4_encode_rdattr_error(xdr, nfserr); 3076 if (p == NULL) { 3077 nfserr = nfserr_toosmall; 3078 goto fail; 3079 } 3080 } 3081 nfserr = nfserr_toosmall; 3082 entry_bytes = xdr->buf->len - start_offset; 3083 if (entry_bytes > cd->rd_maxcount) 3084 goto fail; 3085 cd->rd_maxcount -= entry_bytes; 3086 /* 3087 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so 3088 * let's always let through the first entry, at least: 3089 */ 3090 if (!cd->rd_dircount) 3091 goto fail; 3092 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8; 3093 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset) 3094 goto fail; 3095 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie); 3096 3097 cd->cookie_offset = cookie_offset; 3098 skip_entry: 3099 cd->common.err = nfs_ok; 3100 return 0; 3101 fail: 3102 xdr_truncate_encode(xdr, start_offset); 3103 cd->common.err = nfserr; 3104 return -EINVAL; 3105 } 3106 3107 static __be32 3108 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid) 3109 { 3110 __be32 *p; 3111 3112 p = xdr_reserve_space(xdr, sizeof(stateid_t)); 3113 if (!p) 3114 return nfserr_resource; 3115 *p++ = cpu_to_be32(sid->si_generation); 3116 p = xdr_encode_opaque_fixed(p, &sid->si_opaque, 3117 sizeof(stateid_opaque_t)); 3118 return 0; 3119 } 3120 3121 static __be32 3122 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access) 3123 { 3124 struct xdr_stream *xdr = &resp->xdr; 3125 __be32 *p; 3126 3127 p = xdr_reserve_space(xdr, 8); 3128 if (!p) 3129 return nfserr_resource; 3130 *p++ = cpu_to_be32(access->ac_supported); 3131 *p++ = cpu_to_be32(access->ac_resp_access); 3132 return 0; 3133 } 3134 3135 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts) 3136 { 3137 struct xdr_stream *xdr = &resp->xdr; 3138 __be32 *p; 3139 3140 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8); 3141 if (!p) 3142 return nfserr_resource; 3143 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data, 3144 NFS4_MAX_SESSIONID_LEN); 3145 *p++ = cpu_to_be32(bcts->dir); 3146 /* Upshifting from TCP to RDMA is not supported */ 3147 *p++ = cpu_to_be32(0); 3148 return 0; 3149 } 3150 3151 static __be32 3152 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close) 3153 { 3154 struct xdr_stream *xdr = &resp->xdr; 3155 3156 return nfsd4_encode_stateid(xdr, &close->cl_stateid); 3157 } 3158 3159 3160 static __be32 3161 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit) 3162 { 3163 struct xdr_stream *xdr = &resp->xdr; 3164 __be32 *p; 3165 3166 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3167 if (!p) 3168 return nfserr_resource; 3169 p = xdr_encode_opaque_fixed(p, commit->co_verf.data, 3170 NFS4_VERIFIER_SIZE); 3171 return 0; 3172 } 3173 3174 static __be32 3175 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create) 3176 { 3177 struct xdr_stream *xdr = &resp->xdr; 3178 __be32 *p; 3179 3180 p = xdr_reserve_space(xdr, 20); 3181 if (!p) 3182 return nfserr_resource; 3183 encode_cinfo(p, &create->cr_cinfo); 3184 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0], 3185 create->cr_bmval[1], create->cr_bmval[2]); 3186 return 0; 3187 } 3188 3189 static __be32 3190 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr) 3191 { 3192 struct svc_fh *fhp = getattr->ga_fhp; 3193 struct xdr_stream *xdr = &resp->xdr; 3194 3195 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry, 3196 getattr->ga_bmval, resp->rqstp, 0); 3197 } 3198 3199 static __be32 3200 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp) 3201 { 3202 struct xdr_stream *xdr = &resp->xdr; 3203 struct svc_fh *fhp = *fhpp; 3204 unsigned int len; 3205 __be32 *p; 3206 3207 len = fhp->fh_handle.fh_size; 3208 p = xdr_reserve_space(xdr, len + 4); 3209 if (!p) 3210 return nfserr_resource; 3211 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len); 3212 return 0; 3213 } 3214 3215 /* 3216 * Including all fields other than the name, a LOCK4denied structure requires 3217 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. 3218 */ 3219 static __be32 3220 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld) 3221 { 3222 struct xdr_netobj *conf = &ld->ld_owner; 3223 __be32 *p; 3224 3225 again: 3226 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len)); 3227 if (!p) { 3228 /* 3229 * Don't fail to return the result just because we can't 3230 * return the conflicting open: 3231 */ 3232 if (conf->len) { 3233 kfree(conf->data); 3234 conf->len = 0; 3235 conf->data = NULL; 3236 goto again; 3237 } 3238 return nfserr_resource; 3239 } 3240 p = xdr_encode_hyper(p, ld->ld_start); 3241 p = xdr_encode_hyper(p, ld->ld_length); 3242 *p++ = cpu_to_be32(ld->ld_type); 3243 if (conf->len) { 3244 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8); 3245 p = xdr_encode_opaque(p, conf->data, conf->len); 3246 kfree(conf->data); 3247 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ 3248 p = xdr_encode_hyper(p, (u64)0); /* clientid */ 3249 *p++ = cpu_to_be32(0); /* length of owner name */ 3250 } 3251 return nfserr_denied; 3252 } 3253 3254 static __be32 3255 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock) 3256 { 3257 struct xdr_stream *xdr = &resp->xdr; 3258 3259 if (!nfserr) 3260 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid); 3261 else if (nfserr == nfserr_denied) 3262 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied); 3263 3264 return nfserr; 3265 } 3266 3267 static __be32 3268 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt) 3269 { 3270 struct xdr_stream *xdr = &resp->xdr; 3271 3272 if (nfserr == nfserr_denied) 3273 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied); 3274 return nfserr; 3275 } 3276 3277 static __be32 3278 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku) 3279 { 3280 struct xdr_stream *xdr = &resp->xdr; 3281 3282 return nfsd4_encode_stateid(xdr, &locku->lu_stateid); 3283 } 3284 3285 3286 static __be32 3287 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link) 3288 { 3289 struct xdr_stream *xdr = &resp->xdr; 3290 __be32 *p; 3291 3292 p = xdr_reserve_space(xdr, 20); 3293 if (!p) 3294 return nfserr_resource; 3295 p = encode_cinfo(p, &link->li_cinfo); 3296 return 0; 3297 } 3298 3299 3300 static __be32 3301 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open) 3302 { 3303 struct xdr_stream *xdr = &resp->xdr; 3304 __be32 *p; 3305 3306 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid); 3307 if (nfserr) 3308 return nfserr; 3309 p = xdr_reserve_space(xdr, 24); 3310 if (!p) 3311 return nfserr_resource; 3312 p = encode_cinfo(p, &open->op_cinfo); 3313 *p++ = cpu_to_be32(open->op_rflags); 3314 3315 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1], 3316 open->op_bmval[2]); 3317 if (nfserr) 3318 return nfserr; 3319 3320 p = xdr_reserve_space(xdr, 4); 3321 if (!p) 3322 return nfserr_resource; 3323 3324 *p++ = cpu_to_be32(open->op_delegate_type); 3325 switch (open->op_delegate_type) { 3326 case NFS4_OPEN_DELEGATE_NONE: 3327 break; 3328 case NFS4_OPEN_DELEGATE_READ: 3329 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3330 if (nfserr) 3331 return nfserr; 3332 p = xdr_reserve_space(xdr, 20); 3333 if (!p) 3334 return nfserr_resource; 3335 *p++ = cpu_to_be32(open->op_recall); 3336 3337 /* 3338 * TODO: ACE's in delegations 3339 */ 3340 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3341 *p++ = cpu_to_be32(0); 3342 *p++ = cpu_to_be32(0); 3343 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3344 break; 3345 case NFS4_OPEN_DELEGATE_WRITE: 3346 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3347 if (nfserr) 3348 return nfserr; 3349 p = xdr_reserve_space(xdr, 32); 3350 if (!p) 3351 return nfserr_resource; 3352 *p++ = cpu_to_be32(0); 3353 3354 /* 3355 * TODO: space_limit's in delegations 3356 */ 3357 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE); 3358 *p++ = cpu_to_be32(~(u32)0); 3359 *p++ = cpu_to_be32(~(u32)0); 3360 3361 /* 3362 * TODO: ACE's in delegations 3363 */ 3364 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3365 *p++ = cpu_to_be32(0); 3366 *p++ = cpu_to_be32(0); 3367 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3368 break; 3369 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */ 3370 switch (open->op_why_no_deleg) { 3371 case WND4_CONTENTION: 3372 case WND4_RESOURCE: 3373 p = xdr_reserve_space(xdr, 8); 3374 if (!p) 3375 return nfserr_resource; 3376 *p++ = cpu_to_be32(open->op_why_no_deleg); 3377 /* deleg signaling not supported yet: */ 3378 *p++ = cpu_to_be32(0); 3379 break; 3380 default: 3381 p = xdr_reserve_space(xdr, 4); 3382 if (!p) 3383 return nfserr_resource; 3384 *p++ = cpu_to_be32(open->op_why_no_deleg); 3385 } 3386 break; 3387 default: 3388 BUG(); 3389 } 3390 /* XXX save filehandle here */ 3391 return 0; 3392 } 3393 3394 static __be32 3395 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc) 3396 { 3397 struct xdr_stream *xdr = &resp->xdr; 3398 3399 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid); 3400 } 3401 3402 static __be32 3403 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od) 3404 { 3405 struct xdr_stream *xdr = &resp->xdr; 3406 3407 return nfsd4_encode_stateid(xdr, &od->od_stateid); 3408 } 3409 3410 static __be32 nfsd4_encode_splice_read( 3411 struct nfsd4_compoundres *resp, 3412 struct nfsd4_read *read, 3413 struct file *file, unsigned long maxcount) 3414 { 3415 struct xdr_stream *xdr = &resp->xdr; 3416 struct xdr_buf *buf = xdr->buf; 3417 u32 eof; 3418 long len; 3419 int space_left; 3420 __be32 nfserr; 3421 __be32 *p = xdr->p - 2; 3422 3423 /* Make sure there will be room for padding if needed */ 3424 if (xdr->end - xdr->p < 1) 3425 return nfserr_resource; 3426 3427 len = maxcount; 3428 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp, 3429 file, read->rd_offset, &maxcount); 3430 read->rd_length = maxcount; 3431 if (nfserr) { 3432 /* 3433 * nfsd_splice_actor may have already messed with the 3434 * page length; reset it so as not to confuse 3435 * xdr_truncate_encode: 3436 */ 3437 buf->page_len = 0; 3438 return nfserr; 3439 } 3440 3441 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset, 3442 d_inode(read->rd_fhp->fh_dentry)->i_size); 3443 3444 *(p++) = htonl(eof); 3445 *(p++) = htonl(maxcount); 3446 3447 buf->page_len = maxcount; 3448 buf->len += maxcount; 3449 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1) 3450 / PAGE_SIZE; 3451 3452 /* Use rest of head for padding and remaining ops: */ 3453 buf->tail[0].iov_base = xdr->p; 3454 buf->tail[0].iov_len = 0; 3455 xdr->iov = buf->tail; 3456 if (maxcount&3) { 3457 int pad = 4 - (maxcount&3); 3458 3459 *(xdr->p++) = 0; 3460 3461 buf->tail[0].iov_base += maxcount&3; 3462 buf->tail[0].iov_len = pad; 3463 buf->len += pad; 3464 } 3465 3466 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p, 3467 buf->buflen - buf->len); 3468 buf->buflen = buf->len + space_left; 3469 xdr->end = (__be32 *)((void *)xdr->end + space_left); 3470 3471 return 0; 3472 } 3473 3474 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, 3475 struct nfsd4_read *read, 3476 struct file *file, unsigned long maxcount) 3477 { 3478 struct xdr_stream *xdr = &resp->xdr; 3479 u32 eof; 3480 int v; 3481 int starting_len = xdr->buf->len - 8; 3482 long len; 3483 int thislen; 3484 __be32 nfserr; 3485 __be32 tmp; 3486 __be32 *p; 3487 u32 zzz = 0; 3488 int pad; 3489 3490 len = maxcount; 3491 v = 0; 3492 3493 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p)); 3494 p = xdr_reserve_space(xdr, (thislen+3)&~3); 3495 WARN_ON_ONCE(!p); 3496 resp->rqstp->rq_vec[v].iov_base = p; 3497 resp->rqstp->rq_vec[v].iov_len = thislen; 3498 v++; 3499 len -= thislen; 3500 3501 while (len) { 3502 thislen = min_t(long, len, PAGE_SIZE); 3503 p = xdr_reserve_space(xdr, (thislen+3)&~3); 3504 WARN_ON_ONCE(!p); 3505 resp->rqstp->rq_vec[v].iov_base = p; 3506 resp->rqstp->rq_vec[v].iov_len = thislen; 3507 v++; 3508 len -= thislen; 3509 } 3510 read->rd_vlen = v; 3511 3512 len = maxcount; 3513 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset, 3514 resp->rqstp->rq_vec, read->rd_vlen, &maxcount); 3515 read->rd_length = maxcount; 3516 if (nfserr) 3517 return nfserr; 3518 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3)); 3519 3520 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset, 3521 d_inode(read->rd_fhp->fh_dentry)->i_size); 3522 3523 tmp = htonl(eof); 3524 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4); 3525 tmp = htonl(maxcount); 3526 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4); 3527 3528 pad = (maxcount&3) ? 4 - (maxcount&3) : 0; 3529 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount, 3530 &zzz, pad); 3531 return 0; 3532 3533 } 3534 3535 static __be32 3536 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 3537 struct nfsd4_read *read) 3538 { 3539 unsigned long maxcount; 3540 struct xdr_stream *xdr = &resp->xdr; 3541 struct file *file = read->rd_filp; 3542 int starting_len = xdr->buf->len; 3543 struct raparms *ra = NULL; 3544 __be32 *p; 3545 3546 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ 3547 if (!p) { 3548 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)); 3549 return nfserr_resource; 3550 } 3551 if (resp->xdr.buf->page_len && 3552 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) { 3553 WARN_ON_ONCE(1); 3554 return nfserr_resource; 3555 } 3556 xdr_commit_encode(xdr); 3557 3558 maxcount = svc_max_payload(resp->rqstp); 3559 maxcount = min_t(unsigned long, maxcount, 3560 (xdr->buf->buflen - xdr->buf->len)); 3561 maxcount = min_t(unsigned long, maxcount, read->rd_length); 3562 3563 if (read->rd_tmp_file) 3564 ra = nfsd_init_raparms(file); 3565 3566 if (file->f_op->splice_read && 3567 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) 3568 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 3569 else 3570 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 3571 3572 if (ra) 3573 nfsd_put_raparams(file, ra); 3574 3575 if (nfserr) 3576 xdr_truncate_encode(xdr, starting_len); 3577 3578 return nfserr; 3579 } 3580 3581 static __be32 3582 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink) 3583 { 3584 int maxcount; 3585 __be32 wire_count; 3586 int zero = 0; 3587 struct xdr_stream *xdr = &resp->xdr; 3588 int length_offset = xdr->buf->len; 3589 __be32 *p; 3590 3591 p = xdr_reserve_space(xdr, 4); 3592 if (!p) 3593 return nfserr_resource; 3594 maxcount = PAGE_SIZE; 3595 3596 p = xdr_reserve_space(xdr, maxcount); 3597 if (!p) 3598 return nfserr_resource; 3599 /* 3600 * XXX: By default, vfs_readlink() will truncate symlinks if they 3601 * would overflow the buffer. Is this kosher in NFSv4? If not, one 3602 * easy fix is: if vfs_readlink() precisely fills the buffer, assume 3603 * that truncation occurred, and return NFS4ERR_RESOURCE. 3604 */ 3605 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, 3606 (char *)p, &maxcount); 3607 if (nfserr == nfserr_isdir) 3608 nfserr = nfserr_inval; 3609 if (nfserr) { 3610 xdr_truncate_encode(xdr, length_offset); 3611 return nfserr; 3612 } 3613 3614 wire_count = htonl(maxcount); 3615 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4); 3616 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4)); 3617 if (maxcount & 3) 3618 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, 3619 &zero, 4 - (maxcount&3)); 3620 return 0; 3621 } 3622 3623 static __be32 3624 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir) 3625 { 3626 int maxcount; 3627 int bytes_left; 3628 loff_t offset; 3629 __be64 wire_offset; 3630 struct xdr_stream *xdr = &resp->xdr; 3631 int starting_len = xdr->buf->len; 3632 __be32 *p; 3633 3634 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3635 if (!p) 3636 return nfserr_resource; 3637 3638 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ 3639 *p++ = cpu_to_be32(0); 3640 *p++ = cpu_to_be32(0); 3641 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p) 3642 - (char *)resp->xdr.buf->head[0].iov_base; 3643 3644 /* 3645 * Number of bytes left for directory entries allowing for the 3646 * final 8 bytes of the readdir and a following failed op: 3647 */ 3648 bytes_left = xdr->buf->buflen - xdr->buf->len 3649 - COMPOUND_ERR_SLACK_SPACE - 8; 3650 if (bytes_left < 0) { 3651 nfserr = nfserr_resource; 3652 goto err_no_verf; 3653 } 3654 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX); 3655 /* 3656 * Note the rfc defines rd_maxcount as the size of the 3657 * READDIR4resok structure, which includes the verifier above 3658 * and the 8 bytes encoded at the end of this function: 3659 */ 3660 if (maxcount < 16) { 3661 nfserr = nfserr_toosmall; 3662 goto err_no_verf; 3663 } 3664 maxcount = min_t(int, maxcount-16, bytes_left); 3665 3666 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */ 3667 if (!readdir->rd_dircount) 3668 readdir->rd_dircount = INT_MAX; 3669 3670 readdir->xdr = xdr; 3671 readdir->rd_maxcount = maxcount; 3672 readdir->common.err = 0; 3673 readdir->cookie_offset = 0; 3674 3675 offset = readdir->rd_cookie; 3676 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, 3677 &offset, 3678 &readdir->common, nfsd4_encode_dirent); 3679 if (nfserr == nfs_ok && 3680 readdir->common.err == nfserr_toosmall && 3681 xdr->buf->len == starting_len + 8) { 3682 /* nothing encoded; which limit did we hit?: */ 3683 if (maxcount - 16 < bytes_left) 3684 /* It was the fault of rd_maxcount: */ 3685 nfserr = nfserr_toosmall; 3686 else 3687 /* We ran out of buffer space: */ 3688 nfserr = nfserr_resource; 3689 } 3690 if (nfserr) 3691 goto err_no_verf; 3692 3693 if (readdir->cookie_offset) { 3694 wire_offset = cpu_to_be64(offset); 3695 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, 3696 &wire_offset, 8); 3697 } 3698 3699 p = xdr_reserve_space(xdr, 8); 3700 if (!p) { 3701 WARN_ON_ONCE(1); 3702 goto err_no_verf; 3703 } 3704 *p++ = 0; /* no more entries */ 3705 *p++ = htonl(readdir->common.err == nfserr_eof); 3706 3707 return 0; 3708 err_no_verf: 3709 xdr_truncate_encode(xdr, starting_len); 3710 return nfserr; 3711 } 3712 3713 static __be32 3714 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove) 3715 { 3716 struct xdr_stream *xdr = &resp->xdr; 3717 __be32 *p; 3718 3719 p = xdr_reserve_space(xdr, 20); 3720 if (!p) 3721 return nfserr_resource; 3722 p = encode_cinfo(p, &remove->rm_cinfo); 3723 return 0; 3724 } 3725 3726 static __be32 3727 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename) 3728 { 3729 struct xdr_stream *xdr = &resp->xdr; 3730 __be32 *p; 3731 3732 p = xdr_reserve_space(xdr, 40); 3733 if (!p) 3734 return nfserr_resource; 3735 p = encode_cinfo(p, &rename->rn_sinfo); 3736 p = encode_cinfo(p, &rename->rn_tinfo); 3737 return 0; 3738 } 3739 3740 static __be32 3741 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp) 3742 { 3743 u32 i, nflavs, supported; 3744 struct exp_flavor_info *flavs; 3745 struct exp_flavor_info def_flavs[2]; 3746 __be32 *p, *flavorsp; 3747 static bool report = true; 3748 3749 if (exp->ex_nflavors) { 3750 flavs = exp->ex_flavors; 3751 nflavs = exp->ex_nflavors; 3752 } else { /* Handling of some defaults in absence of real secinfo: */ 3753 flavs = def_flavs; 3754 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { 3755 nflavs = 2; 3756 flavs[0].pseudoflavor = RPC_AUTH_UNIX; 3757 flavs[1].pseudoflavor = RPC_AUTH_NULL; 3758 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { 3759 nflavs = 1; 3760 flavs[0].pseudoflavor 3761 = svcauth_gss_flavor(exp->ex_client); 3762 } else { 3763 nflavs = 1; 3764 flavs[0].pseudoflavor 3765 = exp->ex_client->flavour->flavour; 3766 } 3767 } 3768 3769 supported = 0; 3770 p = xdr_reserve_space(xdr, 4); 3771 if (!p) 3772 return nfserr_resource; 3773 flavorsp = p++; /* to be backfilled later */ 3774 3775 for (i = 0; i < nflavs; i++) { 3776 rpc_authflavor_t pf = flavs[i].pseudoflavor; 3777 struct rpcsec_gss_info info; 3778 3779 if (rpcauth_get_gssinfo(pf, &info) == 0) { 3780 supported++; 3781 p = xdr_reserve_space(xdr, 4 + 4 + 3782 XDR_LEN(info.oid.len) + 4 + 4); 3783 if (!p) 3784 return nfserr_resource; 3785 *p++ = cpu_to_be32(RPC_AUTH_GSS); 3786 p = xdr_encode_opaque(p, info.oid.data, info.oid.len); 3787 *p++ = cpu_to_be32(info.qop); 3788 *p++ = cpu_to_be32(info.service); 3789 } else if (pf < RPC_AUTH_MAXFLAVOR) { 3790 supported++; 3791 p = xdr_reserve_space(xdr, 4); 3792 if (!p) 3793 return nfserr_resource; 3794 *p++ = cpu_to_be32(pf); 3795 } else { 3796 if (report) 3797 pr_warn("NFS: SECINFO: security flavor %u " 3798 "is not supported\n", pf); 3799 } 3800 } 3801 3802 if (nflavs != supported) 3803 report = false; 3804 *flavorsp = htonl(supported); 3805 return 0; 3806 } 3807 3808 static __be32 3809 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 3810 struct nfsd4_secinfo *secinfo) 3811 { 3812 struct xdr_stream *xdr = &resp->xdr; 3813 3814 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp); 3815 } 3816 3817 static __be32 3818 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, 3819 struct nfsd4_secinfo_no_name *secinfo) 3820 { 3821 struct xdr_stream *xdr = &resp->xdr; 3822 3823 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp); 3824 } 3825 3826 /* 3827 * The SETATTR encode routine is special -- it always encodes a bitmap, 3828 * regardless of the error status. 3829 */ 3830 static __be32 3831 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr) 3832 { 3833 struct xdr_stream *xdr = &resp->xdr; 3834 __be32 *p; 3835 3836 p = xdr_reserve_space(xdr, 16); 3837 if (!p) 3838 return nfserr_resource; 3839 if (nfserr) { 3840 *p++ = cpu_to_be32(3); 3841 *p++ = cpu_to_be32(0); 3842 *p++ = cpu_to_be32(0); 3843 *p++ = cpu_to_be32(0); 3844 } 3845 else { 3846 *p++ = cpu_to_be32(3); 3847 *p++ = cpu_to_be32(setattr->sa_bmval[0]); 3848 *p++ = cpu_to_be32(setattr->sa_bmval[1]); 3849 *p++ = cpu_to_be32(setattr->sa_bmval[2]); 3850 } 3851 return nfserr; 3852 } 3853 3854 static __be32 3855 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd) 3856 { 3857 struct xdr_stream *xdr = &resp->xdr; 3858 __be32 *p; 3859 3860 if (!nfserr) { 3861 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE); 3862 if (!p) 3863 return nfserr_resource; 3864 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8); 3865 p = xdr_encode_opaque_fixed(p, &scd->se_confirm, 3866 NFS4_VERIFIER_SIZE); 3867 } 3868 else if (nfserr == nfserr_clid_inuse) { 3869 p = xdr_reserve_space(xdr, 8); 3870 if (!p) 3871 return nfserr_resource; 3872 *p++ = cpu_to_be32(0); 3873 *p++ = cpu_to_be32(0); 3874 } 3875 return nfserr; 3876 } 3877 3878 static __be32 3879 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write) 3880 { 3881 struct xdr_stream *xdr = &resp->xdr; 3882 __be32 *p; 3883 3884 p = xdr_reserve_space(xdr, 16); 3885 if (!p) 3886 return nfserr_resource; 3887 *p++ = cpu_to_be32(write->wr_bytes_written); 3888 *p++ = cpu_to_be32(write->wr_how_written); 3889 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 3890 NFS4_VERIFIER_SIZE); 3891 return 0; 3892 } 3893 3894 static __be32 3895 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, 3896 struct nfsd4_exchange_id *exid) 3897 { 3898 struct xdr_stream *xdr = &resp->xdr; 3899 __be32 *p; 3900 char *major_id; 3901 char *server_scope; 3902 int major_id_sz; 3903 int server_scope_sz; 3904 uint64_t minor_id = 0; 3905 3906 major_id = utsname()->nodename; 3907 major_id_sz = strlen(major_id); 3908 server_scope = utsname()->nodename; 3909 server_scope_sz = strlen(server_scope); 3910 3911 p = xdr_reserve_space(xdr, 3912 8 /* eir_clientid */ + 3913 4 /* eir_sequenceid */ + 3914 4 /* eir_flags */ + 3915 4 /* spr_how */); 3916 if (!p) 3917 return nfserr_resource; 3918 3919 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8); 3920 *p++ = cpu_to_be32(exid->seqid); 3921 *p++ = cpu_to_be32(exid->flags); 3922 3923 *p++ = cpu_to_be32(exid->spa_how); 3924 3925 switch (exid->spa_how) { 3926 case SP4_NONE: 3927 break; 3928 case SP4_MACH_CRED: 3929 /* spo_must_enforce bitmap: */ 3930 nfserr = nfsd4_encode_bitmap(xdr, 3931 exid->spo_must_enforce[0], 3932 exid->spo_must_enforce[1], 3933 exid->spo_must_enforce[2]); 3934 if (nfserr) 3935 return nfserr; 3936 /* spo_must_allow bitmap: */ 3937 nfserr = nfsd4_encode_bitmap(xdr, 3938 exid->spo_must_allow[0], 3939 exid->spo_must_allow[1], 3940 exid->spo_must_allow[2]); 3941 if (nfserr) 3942 return nfserr; 3943 break; 3944 default: 3945 WARN_ON_ONCE(1); 3946 } 3947 3948 p = xdr_reserve_space(xdr, 3949 8 /* so_minor_id */ + 3950 4 /* so_major_id.len */ + 3951 (XDR_QUADLEN(major_id_sz) * 4) + 3952 4 /* eir_server_scope.len */ + 3953 (XDR_QUADLEN(server_scope_sz) * 4) + 3954 4 /* eir_server_impl_id.count (0) */); 3955 if (!p) 3956 return nfserr_resource; 3957 3958 /* The server_owner struct */ 3959 p = xdr_encode_hyper(p, minor_id); /* Minor id */ 3960 /* major id */ 3961 p = xdr_encode_opaque(p, major_id, major_id_sz); 3962 3963 /* Server scope */ 3964 p = xdr_encode_opaque(p, server_scope, server_scope_sz); 3965 3966 /* Implementation id */ 3967 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */ 3968 return 0; 3969 } 3970 3971 static __be32 3972 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, 3973 struct nfsd4_create_session *sess) 3974 { 3975 struct xdr_stream *xdr = &resp->xdr; 3976 __be32 *p; 3977 3978 p = xdr_reserve_space(xdr, 24); 3979 if (!p) 3980 return nfserr_resource; 3981 p = xdr_encode_opaque_fixed(p, sess->sessionid.data, 3982 NFS4_MAX_SESSIONID_LEN); 3983 *p++ = cpu_to_be32(sess->seqid); 3984 *p++ = cpu_to_be32(sess->flags); 3985 3986 p = xdr_reserve_space(xdr, 28); 3987 if (!p) 3988 return nfserr_resource; 3989 *p++ = cpu_to_be32(0); /* headerpadsz */ 3990 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz); 3991 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz); 3992 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached); 3993 *p++ = cpu_to_be32(sess->fore_channel.maxops); 3994 *p++ = cpu_to_be32(sess->fore_channel.maxreqs); 3995 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs); 3996 3997 if (sess->fore_channel.nr_rdma_attrs) { 3998 p = xdr_reserve_space(xdr, 4); 3999 if (!p) 4000 return nfserr_resource; 4001 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs); 4002 } 4003 4004 p = xdr_reserve_space(xdr, 28); 4005 if (!p) 4006 return nfserr_resource; 4007 *p++ = cpu_to_be32(0); /* headerpadsz */ 4008 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz); 4009 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz); 4010 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached); 4011 *p++ = cpu_to_be32(sess->back_channel.maxops); 4012 *p++ = cpu_to_be32(sess->back_channel.maxreqs); 4013 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs); 4014 4015 if (sess->back_channel.nr_rdma_attrs) { 4016 p = xdr_reserve_space(xdr, 4); 4017 if (!p) 4018 return nfserr_resource; 4019 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs); 4020 } 4021 return 0; 4022 } 4023 4024 static __be32 4025 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, 4026 struct nfsd4_sequence *seq) 4027 { 4028 struct xdr_stream *xdr = &resp->xdr; 4029 __be32 *p; 4030 4031 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20); 4032 if (!p) 4033 return nfserr_resource; 4034 p = xdr_encode_opaque_fixed(p, seq->sessionid.data, 4035 NFS4_MAX_SESSIONID_LEN); 4036 *p++ = cpu_to_be32(seq->seqid); 4037 *p++ = cpu_to_be32(seq->slotid); 4038 /* Note slotid's are numbered from zero: */ 4039 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */ 4040 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */ 4041 *p++ = cpu_to_be32(seq->status_flags); 4042 4043 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */ 4044 return 0; 4045 } 4046 4047 static __be32 4048 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, 4049 struct nfsd4_test_stateid *test_stateid) 4050 { 4051 struct xdr_stream *xdr = &resp->xdr; 4052 struct nfsd4_test_stateid_id *stateid, *next; 4053 __be32 *p; 4054 4055 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids)); 4056 if (!p) 4057 return nfserr_resource; 4058 *p++ = htonl(test_stateid->ts_num_ids); 4059 4060 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) { 4061 *p++ = stateid->ts_id_status; 4062 } 4063 4064 return 0; 4065 } 4066 4067 #ifdef CONFIG_NFSD_PNFS 4068 static __be32 4069 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4070 struct nfsd4_getdeviceinfo *gdev) 4071 { 4072 struct xdr_stream *xdr = &resp->xdr; 4073 const struct nfsd4_layout_ops *ops; 4074 u32 starting_len = xdr->buf->len, needed_len; 4075 __be32 *p; 4076 4077 p = xdr_reserve_space(xdr, 4); 4078 if (!p) 4079 return nfserr_resource; 4080 4081 *p++ = cpu_to_be32(gdev->gd_layout_type); 4082 4083 /* If maxcount is 0 then just update notifications */ 4084 if (gdev->gd_maxcount != 0) { 4085 ops = nfsd4_layout_ops[gdev->gd_layout_type]; 4086 nfserr = ops->encode_getdeviceinfo(xdr, gdev); 4087 if (nfserr) { 4088 /* 4089 * We don't bother to burden the layout drivers with 4090 * enforcing gd_maxcount, just tell the client to 4091 * come back with a bigger buffer if it's not enough. 4092 */ 4093 if (xdr->buf->len + 4 > gdev->gd_maxcount) 4094 goto toosmall; 4095 return nfserr; 4096 } 4097 } 4098 4099 if (gdev->gd_notify_types) { 4100 p = xdr_reserve_space(xdr, 4 + 4); 4101 if (!p) 4102 return nfserr_resource; 4103 *p++ = cpu_to_be32(1); /* bitmap length */ 4104 *p++ = cpu_to_be32(gdev->gd_notify_types); 4105 } else { 4106 p = xdr_reserve_space(xdr, 4); 4107 if (!p) 4108 return nfserr_resource; 4109 *p++ = 0; 4110 } 4111 4112 return 0; 4113 toosmall: 4114 dprintk("%s: maxcount too small\n", __func__); 4115 needed_len = xdr->buf->len + 4 /* notifications */; 4116 xdr_truncate_encode(xdr, starting_len); 4117 p = xdr_reserve_space(xdr, 4); 4118 if (!p) 4119 return nfserr_resource; 4120 *p++ = cpu_to_be32(needed_len); 4121 return nfserr_toosmall; 4122 } 4123 4124 static __be32 4125 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, 4126 struct nfsd4_layoutget *lgp) 4127 { 4128 struct xdr_stream *xdr = &resp->xdr; 4129 const struct nfsd4_layout_ops *ops; 4130 __be32 *p; 4131 4132 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t)); 4133 if (!p) 4134 return nfserr_resource; 4135 4136 *p++ = cpu_to_be32(1); /* we always set return-on-close */ 4137 *p++ = cpu_to_be32(lgp->lg_sid.si_generation); 4138 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque, 4139 sizeof(stateid_opaque_t)); 4140 4141 *p++ = cpu_to_be32(1); /* we always return a single layout */ 4142 p = xdr_encode_hyper(p, lgp->lg_seg.offset); 4143 p = xdr_encode_hyper(p, lgp->lg_seg.length); 4144 *p++ = cpu_to_be32(lgp->lg_seg.iomode); 4145 *p++ = cpu_to_be32(lgp->lg_layout_type); 4146 4147 ops = nfsd4_layout_ops[lgp->lg_layout_type]; 4148 return ops->encode_layoutget(xdr, lgp); 4149 } 4150 4151 static __be32 4152 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, 4153 struct nfsd4_layoutcommit *lcp) 4154 { 4155 struct xdr_stream *xdr = &resp->xdr; 4156 __be32 *p; 4157 4158 p = xdr_reserve_space(xdr, 4); 4159 if (!p) 4160 return nfserr_resource; 4161 *p++ = cpu_to_be32(lcp->lc_size_chg); 4162 if (lcp->lc_size_chg) { 4163 p = xdr_reserve_space(xdr, 8); 4164 if (!p) 4165 return nfserr_resource; 4166 p = xdr_encode_hyper(p, lcp->lc_newsize); 4167 } 4168 4169 return 0; 4170 } 4171 4172 static __be32 4173 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr, 4174 struct nfsd4_layoutreturn *lrp) 4175 { 4176 struct xdr_stream *xdr = &resp->xdr; 4177 __be32 *p; 4178 4179 p = xdr_reserve_space(xdr, 4); 4180 if (!p) 4181 return nfserr_resource; 4182 *p++ = cpu_to_be32(lrp->lrs_present); 4183 if (lrp->lrs_present) 4184 return nfsd4_encode_stateid(xdr, &lrp->lr_sid); 4185 return 0; 4186 } 4187 #endif /* CONFIG_NFSD_PNFS */ 4188 4189 static __be32 4190 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write) 4191 { 4192 __be32 *p; 4193 4194 p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE); 4195 if (!p) 4196 return nfserr_resource; 4197 4198 *p++ = cpu_to_be32(0); 4199 p = xdr_encode_hyper(p, write->wr_bytes_written); 4200 *p++ = cpu_to_be32(write->wr_stable_how); 4201 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4202 NFS4_VERIFIER_SIZE); 4203 return nfs_ok; 4204 } 4205 4206 static __be32 4207 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr, 4208 struct nfsd4_copy *copy) 4209 { 4210 __be32 *p; 4211 4212 nfserr = nfsd42_encode_write_res(resp, ©->cp_res); 4213 if (nfserr) 4214 return nfserr; 4215 4216 p = xdr_reserve_space(&resp->xdr, 4 + 4); 4217 *p++ = xdr_one; /* cr_consecutive */ 4218 *p++ = cpu_to_be32(copy->cp_synchronous); 4219 return 0; 4220 } 4221 4222 static __be32 4223 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, 4224 struct nfsd4_seek *seek) 4225 { 4226 __be32 *p; 4227 4228 p = xdr_reserve_space(&resp->xdr, 4 + 8); 4229 *p++ = cpu_to_be32(seek->seek_eof); 4230 p = xdr_encode_hyper(p, seek->seek_pos); 4231 4232 return 0; 4233 } 4234 4235 static __be32 4236 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p) 4237 { 4238 return nfserr; 4239 } 4240 4241 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *); 4242 4243 /* 4244 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1 4245 * since we don't need to filter out obsolete ops as this is 4246 * done in the decoding phase. 4247 */ 4248 static const nfsd4_enc nfsd4_enc_ops[] = { 4249 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access, 4250 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close, 4251 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit, 4252 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create, 4253 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop, 4254 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop, 4255 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr, 4256 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh, 4257 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link, 4258 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock, 4259 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt, 4260 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku, 4261 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop, 4262 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop, 4263 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop, 4264 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open, 4265 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop, 4266 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm, 4267 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade, 4268 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop, 4269 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop, 4270 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop, 4271 [OP_READ] = (nfsd4_enc)nfsd4_encode_read, 4272 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir, 4273 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink, 4274 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove, 4275 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename, 4276 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop, 4277 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop, 4278 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop, 4279 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo, 4280 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr, 4281 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid, 4282 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop, 4283 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop, 4284 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write, 4285 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop, 4286 4287 /* NFSv4.1 operations */ 4288 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop, 4289 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session, 4290 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id, 4291 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session, 4292 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop, 4293 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop, 4294 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 4295 #ifdef CONFIG_NFSD_PNFS 4296 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo, 4297 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 4298 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit, 4299 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget, 4300 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn, 4301 #else 4302 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop, 4303 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 4304 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop, 4305 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop, 4306 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop, 4307 #endif 4308 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name, 4309 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence, 4310 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop, 4311 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid, 4312 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 4313 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop, 4314 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop, 4315 4316 /* NFSv4.2 operations */ 4317 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 4318 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy, 4319 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop, 4320 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 4321 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop, 4322 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop, 4323 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop, 4324 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop, 4325 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop, 4326 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop, 4327 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek, 4328 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop, 4329 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop, 4330 }; 4331 4332 /* 4333 * Calculate whether we still have space to encode repsize bytes. 4334 * There are two considerations: 4335 * - For NFS versions >=4.1, the size of the reply must stay within 4336 * session limits 4337 * - For all NFS versions, we must stay within limited preallocated 4338 * buffer space. 4339 * 4340 * This is called before the operation is processed, so can only provide 4341 * an upper estimate. For some nonidempotent operations (such as 4342 * getattr), it's not necessarily a problem if that estimate is wrong, 4343 * as we can fail it after processing without significant side effects. 4344 */ 4345 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize) 4346 { 4347 struct xdr_buf *buf = &resp->rqstp->rq_res; 4348 struct nfsd4_slot *slot = resp->cstate.slot; 4349 4350 if (buf->len + respsize <= buf->buflen) 4351 return nfs_ok; 4352 if (!nfsd4_has_session(&resp->cstate)) 4353 return nfserr_resource; 4354 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) { 4355 WARN_ON_ONCE(1); 4356 return nfserr_rep_too_big_to_cache; 4357 } 4358 return nfserr_rep_too_big; 4359 } 4360 4361 void 4362 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 4363 { 4364 struct xdr_stream *xdr = &resp->xdr; 4365 struct nfs4_stateowner *so = resp->cstate.replay_owner; 4366 struct svc_rqst *rqstp = resp->rqstp; 4367 const struct nfsd4_operation *opdesc = op->opdesc; 4368 int post_err_offset; 4369 nfsd4_enc encoder; 4370 __be32 *p; 4371 4372 p = xdr_reserve_space(xdr, 8); 4373 if (!p) { 4374 WARN_ON_ONCE(1); 4375 return; 4376 } 4377 *p++ = cpu_to_be32(op->opnum); 4378 post_err_offset = xdr->buf->len; 4379 4380 if (op->opnum == OP_ILLEGAL) 4381 goto status; 4382 if (op->status && opdesc && 4383 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE)) 4384 goto status; 4385 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || 4386 !nfsd4_enc_ops[op->opnum]); 4387 encoder = nfsd4_enc_ops[op->opnum]; 4388 op->status = encoder(resp, op->status, &op->u); 4389 if (opdesc && opdesc->op_release) 4390 opdesc->op_release(&op->u); 4391 xdr_commit_encode(xdr); 4392 4393 /* nfsd4_check_resp_size guarantees enough room for error status */ 4394 if (!op->status) { 4395 int space_needed = 0; 4396 if (!nfsd4_last_compound_op(rqstp)) 4397 space_needed = COMPOUND_ERR_SLACK_SPACE; 4398 op->status = nfsd4_check_resp_size(resp, space_needed); 4399 } 4400 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) { 4401 struct nfsd4_slot *slot = resp->cstate.slot; 4402 4403 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) 4404 op->status = nfserr_rep_too_big_to_cache; 4405 else 4406 op->status = nfserr_rep_too_big; 4407 } 4408 if (op->status == nfserr_resource || 4409 op->status == nfserr_rep_too_big || 4410 op->status == nfserr_rep_too_big_to_cache) { 4411 /* 4412 * The operation may have already been encoded or 4413 * partially encoded. No op returns anything additional 4414 * in the case of one of these three errors, so we can 4415 * just truncate back to after the status. But it's a 4416 * bug if we had to do this on a non-idempotent op: 4417 */ 4418 warn_on_nonidempotent_op(op); 4419 xdr_truncate_encode(xdr, post_err_offset); 4420 } 4421 if (so) { 4422 int len = xdr->buf->len - post_err_offset; 4423 4424 so->so_replay.rp_status = op->status; 4425 so->so_replay.rp_buflen = len; 4426 read_bytes_from_xdr_buf(xdr->buf, post_err_offset, 4427 so->so_replay.rp_buf, len); 4428 } 4429 status: 4430 /* Note that op->status is already in network byte order: */ 4431 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4); 4432 } 4433 4434 /* 4435 * Encode the reply stored in the stateowner reply cache 4436 * 4437 * XDR note: do not encode rp->rp_buflen: the buffer contains the 4438 * previously sent already encoded operation. 4439 */ 4440 void 4441 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op) 4442 { 4443 __be32 *p; 4444 struct nfs4_replay *rp = op->replay; 4445 4446 BUG_ON(!rp); 4447 4448 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen); 4449 if (!p) { 4450 WARN_ON_ONCE(1); 4451 return; 4452 } 4453 *p++ = cpu_to_be32(op->opnum); 4454 *p++ = rp->rp_status; /* already xdr'ed */ 4455 4456 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen); 4457 } 4458 4459 int 4460 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p) 4461 { 4462 return xdr_ressize_check(rqstp, p); 4463 } 4464 4465 void nfsd4_release_compoundargs(struct svc_rqst *rqstp) 4466 { 4467 struct nfsd4_compoundargs *args = rqstp->rq_argp; 4468 4469 if (args->ops != args->iops) { 4470 kfree(args->ops); 4471 args->ops = args->iops; 4472 } 4473 kfree(args->tmpp); 4474 args->tmpp = NULL; 4475 while (args->to_free) { 4476 struct svcxdr_tmpbuf *tb = args->to_free; 4477 args->to_free = tb->next; 4478 kfree(tb); 4479 } 4480 } 4481 4482 int 4483 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p) 4484 { 4485 struct nfsd4_compoundargs *args = rqstp->rq_argp; 4486 4487 if (rqstp->rq_arg.head[0].iov_len % 4) { 4488 /* client is nuts */ 4489 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)", 4490 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid)); 4491 return 0; 4492 } 4493 args->p = p; 4494 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len; 4495 args->pagelist = rqstp->rq_arg.pages; 4496 args->pagelen = rqstp->rq_arg.page_len; 4497 args->tail = false; 4498 args->tmpp = NULL; 4499 args->to_free = NULL; 4500 args->ops = args->iops; 4501 args->rqstp = rqstp; 4502 4503 return !nfsd4_decode_compound(args); 4504 } 4505 4506 int 4507 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p) 4508 { 4509 /* 4510 * All that remains is to write the tag and operation count... 4511 */ 4512 struct nfsd4_compoundres *resp = rqstp->rq_resp; 4513 struct xdr_buf *buf = resp->xdr.buf; 4514 4515 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len + 4516 buf->tail[0].iov_len); 4517 4518 rqstp->rq_next_page = resp->xdr.page_ptr + 1; 4519 4520 p = resp->tagp; 4521 *p++ = htonl(resp->taglen); 4522 memcpy(p, resp->tag, resp->taglen); 4523 p += XDR_QUADLEN(resp->taglen); 4524 *p++ = htonl(resp->opcnt); 4525 4526 nfsd4_sequence_done(resp); 4527 return 1; 4528 } 4529 4530 /* 4531 * Local variables: 4532 * c-basic-offset: 8 4533 * End: 4534 */ 4535