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 #include <linux/sunrpc/addr.h> 44 #include <linux/xattr.h> 45 #include <linux/vmalloc.h> 46 47 #include <uapi/linux/xattr.h> 48 49 #include "idmap.h" 50 #include "acl.h" 51 #include "xdr4.h" 52 #include "vfs.h" 53 #include "state.h" 54 #include "cache.h" 55 #include "netns.h" 56 #include "pnfs.h" 57 #include "filecache.h" 58 59 #include "trace.h" 60 61 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 62 #include <linux/security.h> 63 #endif 64 65 66 #define NFSDDBG_FACILITY NFSDDBG_XDR 67 68 const u32 nfsd_suppattrs[3][3] = { 69 {NFSD4_SUPPORTED_ATTRS_WORD0, 70 NFSD4_SUPPORTED_ATTRS_WORD1, 71 NFSD4_SUPPORTED_ATTRS_WORD2}, 72 73 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 74 NFSD4_1_SUPPORTED_ATTRS_WORD1, 75 NFSD4_1_SUPPORTED_ATTRS_WORD2}, 76 77 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 78 NFSD4_1_SUPPORTED_ATTRS_WORD1, 79 NFSD4_2_SUPPORTED_ATTRS_WORD2}, 80 }; 81 82 /* 83 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing 84 * directory in order to indicate to the client that a filesystem boundary is present 85 * We use a fixed fsid for a referral 86 */ 87 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL 88 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL 89 90 static __be32 91 check_filename(char *str, int len) 92 { 93 int i; 94 95 if (len == 0) 96 return nfserr_inval; 97 if (len > NFS4_MAXNAMLEN) 98 return nfserr_nametoolong; 99 if (isdotent(str, len)) 100 return nfserr_badname; 101 for (i = 0; i < len; i++) 102 if (str[i] == '/') 103 return nfserr_badname; 104 return 0; 105 } 106 107 static int zero_clientid(clientid_t *clid) 108 { 109 return (clid->cl_boot == 0) && (clid->cl_id == 0); 110 } 111 112 /** 113 * svcxdr_tmpalloc - allocate memory to be freed after compound processing 114 * @argp: NFSv4 compound argument structure 115 * @len: length of buffer to allocate 116 * 117 * Allocates a buffer of size @len to be freed when processing the compound 118 * operation described in @argp finishes. 119 */ 120 static void * 121 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, size_t len) 122 { 123 struct svcxdr_tmpbuf *tb; 124 125 tb = kmalloc(struct_size(tb, buf, len), GFP_KERNEL); 126 if (!tb) 127 return NULL; 128 tb->next = argp->to_free; 129 argp->to_free = tb; 130 return tb->buf; 131 } 132 133 /* 134 * For xdr strings that need to be passed to other kernel api's 135 * as null-terminated strings. 136 * 137 * Note null-terminating in place usually isn't safe since the 138 * buffer might end on a page boundary. 139 */ 140 static char * 141 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, size_t len) 142 { 143 char *p = svcxdr_tmpalloc(argp, size_add(len, 1)); 144 145 if (!p) 146 return NULL; 147 memcpy(p, buf, len); 148 p[len] = '\0'; 149 return p; 150 } 151 152 static void * 153 svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, size_t len) 154 { 155 __be32 *tmp; 156 157 /* 158 * The location of the decoded data item is stable, 159 * so @p is OK to use. This is the common case. 160 */ 161 if (p != argp->xdr->scratch.iov_base) 162 return p; 163 164 tmp = svcxdr_tmpalloc(argp, len); 165 if (!tmp) 166 return NULL; 167 memcpy(tmp, p, len); 168 return tmp; 169 } 170 171 /* 172 * NFSv4 basic data type decoders 173 */ 174 175 /* 176 * This helper handles variable-length opaques which belong to protocol 177 * elements that this implementation does not support. 178 */ 179 static __be32 180 nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen) 181 { 182 u32 len; 183 184 if (xdr_stream_decode_u32(argp->xdr, &len) < 0) 185 return nfserr_bad_xdr; 186 if (maxlen && len > maxlen) 187 return nfserr_bad_xdr; 188 if (!xdr_inline_decode(argp->xdr, len)) 189 return nfserr_bad_xdr; 190 191 return nfs_ok; 192 } 193 194 static __be32 195 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o) 196 { 197 __be32 *p; 198 u32 len; 199 200 if (xdr_stream_decode_u32(argp->xdr, &len) < 0) 201 return nfserr_bad_xdr; 202 if (len == 0 || len > NFS4_OPAQUE_LIMIT) 203 return nfserr_bad_xdr; 204 p = xdr_inline_decode(argp->xdr, len); 205 if (!p) 206 return nfserr_bad_xdr; 207 o->data = svcxdr_savemem(argp, p, len); 208 if (!o->data) 209 return nfserr_jukebox; 210 o->len = len; 211 212 return nfs_ok; 213 } 214 215 static __be32 216 nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp) 217 { 218 __be32 *p, status; 219 220 if (xdr_stream_decode_u32(argp->xdr, lenp) < 0) 221 return nfserr_bad_xdr; 222 p = xdr_inline_decode(argp->xdr, *lenp); 223 if (!p) 224 return nfserr_bad_xdr; 225 status = check_filename((char *)p, *lenp); 226 if (status) 227 return status; 228 *namp = svcxdr_savemem(argp, p, *lenp); 229 if (!*namp) 230 return nfserr_jukebox; 231 232 return nfs_ok; 233 } 234 235 static __be32 236 nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv) 237 { 238 __be32 *p; 239 240 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3); 241 if (!p) 242 return nfserr_bad_xdr; 243 p = xdr_decode_hyper(p, &tv->tv_sec); 244 tv->tv_nsec = be32_to_cpup(p++); 245 if (tv->tv_nsec >= (u32)1000000000) 246 return nfserr_inval; 247 return nfs_ok; 248 } 249 250 static __be32 251 nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf) 252 { 253 __be32 *p; 254 255 p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE); 256 if (!p) 257 return nfserr_bad_xdr; 258 memcpy(verf->data, p, sizeof(verf->data)); 259 return nfs_ok; 260 } 261 262 /** 263 * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4 264 * @argp: NFSv4 compound argument structure 265 * @bmval: pointer to an array of u32's to decode into 266 * @bmlen: size of the @bmval array 267 * 268 * The server needs to return nfs_ok rather than nfserr_bad_xdr when 269 * encountering bitmaps containing bits it does not recognize. This 270 * includes bits in bitmap words past WORDn, where WORDn is the last 271 * bitmap WORD the implementation currently supports. Thus we are 272 * careful here to simply ignore bits in bitmap words that this 273 * implementation has yet to support explicitly. 274 * 275 * Return values: 276 * %nfs_ok: @bmval populated successfully 277 * %nfserr_bad_xdr: the encoded bitmap was invalid 278 */ 279 static __be32 280 nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen) 281 { 282 ssize_t status; 283 284 status = xdr_stream_decode_uint32_array(argp->xdr, bmval, bmlen); 285 return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok; 286 } 287 288 static __be32 289 nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace) 290 { 291 __be32 *p, status; 292 u32 length; 293 294 if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0) 295 return nfserr_bad_xdr; 296 if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0) 297 return nfserr_bad_xdr; 298 if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0) 299 return nfserr_bad_xdr; 300 301 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 302 return nfserr_bad_xdr; 303 p = xdr_inline_decode(argp->xdr, length); 304 if (!p) 305 return nfserr_bad_xdr; 306 ace->whotype = nfs4_acl_get_whotype((char *)p, length); 307 if (ace->whotype != NFS4_ACL_WHO_NAMED) 308 status = nfs_ok; 309 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 310 status = nfsd_map_name_to_gid(argp->rqstp, 311 (char *)p, length, &ace->who_gid); 312 else 313 status = nfsd_map_name_to_uid(argp->rqstp, 314 (char *)p, length, &ace->who_uid); 315 316 return status; 317 } 318 319 /* A counted array of nfsace4's */ 320 static noinline __be32 321 nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl) 322 { 323 struct nfs4_ace *ace; 324 __be32 status; 325 u32 count; 326 327 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 328 return nfserr_bad_xdr; 329 330 if (count > xdr_stream_remaining(argp->xdr) / 20) 331 /* 332 * Even with 4-byte names there wouldn't be 333 * space for that many aces; something fishy is 334 * going on: 335 */ 336 return nfserr_fbig; 337 338 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count)); 339 if (*acl == NULL) 340 return nfserr_jukebox; 341 342 (*acl)->naces = count; 343 for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) { 344 status = nfsd4_decode_nfsace4(argp, ace); 345 if (status) 346 return status; 347 } 348 349 return nfs_ok; 350 } 351 352 static noinline __be32 353 nfsd4_decode_security_label(struct nfsd4_compoundargs *argp, 354 struct xdr_netobj *label) 355 { 356 u32 lfs, pi, length; 357 __be32 *p; 358 359 if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0) 360 return nfserr_bad_xdr; 361 if (xdr_stream_decode_u32(argp->xdr, &pi) < 0) 362 return nfserr_bad_xdr; 363 364 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 365 return nfserr_bad_xdr; 366 if (length > NFS4_MAXLABELLEN) 367 return nfserr_badlabel; 368 p = xdr_inline_decode(argp->xdr, length); 369 if (!p) 370 return nfserr_bad_xdr; 371 label->len = length; 372 label->data = svcxdr_dupstr(argp, p, length); 373 if (!label->data) 374 return nfserr_jukebox; 375 376 return nfs_ok; 377 } 378 379 static __be32 380 nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen, 381 struct iattr *iattr, struct nfs4_acl **acl, 382 struct xdr_netobj *label, int *umask) 383 { 384 unsigned int starting_pos; 385 u32 attrlist4_count; 386 __be32 *p, status; 387 388 iattr->ia_valid = 0; 389 status = nfsd4_decode_bitmap4(argp, bmval, bmlen); 390 if (status) 391 return nfserr_bad_xdr; 392 393 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0 394 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1 395 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) { 396 if (nfsd_attrs_supported(argp->minorversion, bmval)) 397 return nfserr_inval; 398 return nfserr_attrnotsupp; 399 } 400 401 if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0) 402 return nfserr_bad_xdr; 403 starting_pos = xdr_stream_pos(argp->xdr); 404 405 if (bmval[0] & FATTR4_WORD0_SIZE) { 406 u64 size; 407 408 if (xdr_stream_decode_u64(argp->xdr, &size) < 0) 409 return nfserr_bad_xdr; 410 iattr->ia_size = size; 411 iattr->ia_valid |= ATTR_SIZE; 412 } 413 if (bmval[0] & FATTR4_WORD0_ACL) { 414 status = nfsd4_decode_acl(argp, acl); 415 if (status) 416 return status; 417 } else 418 *acl = NULL; 419 if (bmval[1] & FATTR4_WORD1_MODE) { 420 u32 mode; 421 422 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0) 423 return nfserr_bad_xdr; 424 iattr->ia_mode = mode; 425 iattr->ia_mode &= (S_IFMT | S_IALLUGO); 426 iattr->ia_valid |= ATTR_MODE; 427 } 428 if (bmval[1] & FATTR4_WORD1_OWNER) { 429 u32 length; 430 431 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 432 return nfserr_bad_xdr; 433 p = xdr_inline_decode(argp->xdr, length); 434 if (!p) 435 return nfserr_bad_xdr; 436 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length, 437 &iattr->ia_uid); 438 if (status) 439 return status; 440 iattr->ia_valid |= ATTR_UID; 441 } 442 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { 443 u32 length; 444 445 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 446 return nfserr_bad_xdr; 447 p = xdr_inline_decode(argp->xdr, length); 448 if (!p) 449 return nfserr_bad_xdr; 450 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length, 451 &iattr->ia_gid); 452 if (status) 453 return status; 454 iattr->ia_valid |= ATTR_GID; 455 } 456 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { 457 u32 set_it; 458 459 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0) 460 return nfserr_bad_xdr; 461 switch (set_it) { 462 case NFS4_SET_TO_CLIENT_TIME: 463 status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime); 464 if (status) 465 return status; 466 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 467 break; 468 case NFS4_SET_TO_SERVER_TIME: 469 iattr->ia_valid |= ATTR_ATIME; 470 break; 471 default: 472 return nfserr_bad_xdr; 473 } 474 } 475 if (bmval[1] & FATTR4_WORD1_TIME_CREATE) { 476 struct timespec64 ts; 477 478 /* No Linux filesystem supports setting this attribute. */ 479 bmval[1] &= ~FATTR4_WORD1_TIME_CREATE; 480 status = nfsd4_decode_nfstime4(argp, &ts); 481 if (status) 482 return status; 483 } 484 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 485 u32 set_it; 486 487 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0) 488 return nfserr_bad_xdr; 489 switch (set_it) { 490 case NFS4_SET_TO_CLIENT_TIME: 491 status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime); 492 if (status) 493 return status; 494 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 495 break; 496 case NFS4_SET_TO_SERVER_TIME: 497 iattr->ia_valid |= ATTR_MTIME; 498 break; 499 default: 500 return nfserr_bad_xdr; 501 } 502 } 503 label->len = 0; 504 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) && 505 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) { 506 status = nfsd4_decode_security_label(argp, label); 507 if (status) 508 return status; 509 } 510 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) { 511 u32 mode, mask; 512 513 if (!umask) 514 return nfserr_bad_xdr; 515 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0) 516 return nfserr_bad_xdr; 517 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO); 518 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0) 519 return nfserr_bad_xdr; 520 *umask = mask & S_IRWXUGO; 521 iattr->ia_valid |= ATTR_MODE; 522 } 523 524 /* request sanity: did attrlist4 contain the expected number of words? */ 525 if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos) 526 return nfserr_bad_xdr; 527 528 return nfs_ok; 529 } 530 531 static __be32 532 nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid) 533 { 534 __be32 *p; 535 536 p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE); 537 if (!p) 538 return nfserr_bad_xdr; 539 sid->si_generation = be32_to_cpup(p++); 540 memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque)); 541 return nfs_ok; 542 } 543 544 static __be32 545 nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid) 546 { 547 __be32 *p; 548 549 p = xdr_inline_decode(argp->xdr, sizeof(__be64)); 550 if (!p) 551 return nfserr_bad_xdr; 552 memcpy(clientid, p, sizeof(*clientid)); 553 return nfs_ok; 554 } 555 556 static __be32 557 nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp, 558 clientid_t *clientid, struct xdr_netobj *owner) 559 { 560 __be32 status; 561 562 status = nfsd4_decode_clientid4(argp, clientid); 563 if (status) 564 return status; 565 return nfsd4_decode_opaque(argp, owner); 566 } 567 568 #ifdef CONFIG_NFSD_PNFS 569 static __be32 570 nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp, 571 struct nfsd4_deviceid *devid) 572 { 573 __be32 *p; 574 575 p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE); 576 if (!p) 577 return nfserr_bad_xdr; 578 memcpy(devid, p, sizeof(*devid)); 579 return nfs_ok; 580 } 581 582 static __be32 583 nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp, 584 struct nfsd4_layoutcommit *lcp) 585 { 586 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0) 587 return nfserr_bad_xdr; 588 if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES) 589 return nfserr_bad_xdr; 590 if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX) 591 return nfserr_bad_xdr; 592 593 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0) 594 return nfserr_bad_xdr; 595 if (lcp->lc_up_len > 0) { 596 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len); 597 if (!lcp->lc_up_layout) 598 return nfserr_bad_xdr; 599 } 600 601 return nfs_ok; 602 } 603 604 static __be32 605 nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp, 606 struct nfsd4_layoutreturn *lrp) 607 { 608 __be32 status; 609 610 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0) 611 return nfserr_bad_xdr; 612 switch (lrp->lr_return_type) { 613 case RETURN_FILE: 614 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0) 615 return nfserr_bad_xdr; 616 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0) 617 return nfserr_bad_xdr; 618 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid); 619 if (status) 620 return status; 621 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0) 622 return nfserr_bad_xdr; 623 if (lrp->lrf_body_len > 0) { 624 lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len); 625 if (!lrp->lrf_body) 626 return nfserr_bad_xdr; 627 } 628 break; 629 case RETURN_FSID: 630 case RETURN_ALL: 631 lrp->lr_seg.offset = 0; 632 lrp->lr_seg.length = NFS4_MAX_UINT64; 633 break; 634 default: 635 return nfserr_bad_xdr; 636 } 637 638 return nfs_ok; 639 } 640 641 #endif /* CONFIG_NFSD_PNFS */ 642 643 static __be32 644 nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp, 645 struct nfs4_sessionid *sessionid) 646 { 647 __be32 *p; 648 649 p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN); 650 if (!p) 651 return nfserr_bad_xdr; 652 memcpy(sessionid->data, p, sizeof(sessionid->data)); 653 return nfs_ok; 654 } 655 656 /* Defined in Appendix A of RFC 5531 */ 657 static __be32 658 nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp, 659 struct nfsd4_cb_sec *cbs) 660 { 661 u32 stamp, gidcount, uid, gid; 662 __be32 *p, status; 663 664 if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0) 665 return nfserr_bad_xdr; 666 /* machine name */ 667 status = nfsd4_decode_ignored_string(argp, 255); 668 if (status) 669 return status; 670 if (xdr_stream_decode_u32(argp->xdr, &uid) < 0) 671 return nfserr_bad_xdr; 672 if (xdr_stream_decode_u32(argp->xdr, &gid) < 0) 673 return nfserr_bad_xdr; 674 if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0) 675 return nfserr_bad_xdr; 676 if (gidcount > 16) 677 return nfserr_bad_xdr; 678 p = xdr_inline_decode(argp->xdr, gidcount << 2); 679 if (!p) 680 return nfserr_bad_xdr; 681 if (cbs->flavor == (u32)(-1)) { 682 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp); 683 684 kuid_t kuid = make_kuid(userns, uid); 685 kgid_t kgid = make_kgid(userns, gid); 686 if (uid_valid(kuid) && gid_valid(kgid)) { 687 cbs->uid = kuid; 688 cbs->gid = kgid; 689 cbs->flavor = RPC_AUTH_UNIX; 690 } else { 691 dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n"); 692 } 693 } 694 695 return nfs_ok; 696 } 697 698 static __be32 699 nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp, 700 struct nfsd4_cb_sec *cbs) 701 { 702 __be32 status; 703 u32 service; 704 705 dprintk("RPC_AUTH_GSS callback secflavor not supported!\n"); 706 707 if (xdr_stream_decode_u32(argp->xdr, &service) < 0) 708 return nfserr_bad_xdr; 709 if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY) 710 return nfserr_bad_xdr; 711 /* gcbp_handle_from_server */ 712 status = nfsd4_decode_ignored_string(argp, 0); 713 if (status) 714 return status; 715 /* gcbp_handle_from_client */ 716 status = nfsd4_decode_ignored_string(argp, 0); 717 if (status) 718 return status; 719 720 return nfs_ok; 721 } 722 723 /* a counted array of callback_sec_parms4 items */ 724 static __be32 725 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs) 726 { 727 u32 i, secflavor, nr_secflavs; 728 __be32 status; 729 730 /* callback_sec_params4 */ 731 if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0) 732 return nfserr_bad_xdr; 733 if (nr_secflavs) 734 cbs->flavor = (u32)(-1); 735 else 736 /* Is this legal? Be generous, take it to mean AUTH_NONE: */ 737 cbs->flavor = 0; 738 739 for (i = 0; i < nr_secflavs; ++i) { 740 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0) 741 return nfserr_bad_xdr; 742 switch (secflavor) { 743 case RPC_AUTH_NULL: 744 /* void */ 745 if (cbs->flavor == (u32)(-1)) 746 cbs->flavor = RPC_AUTH_NULL; 747 break; 748 case RPC_AUTH_UNIX: 749 status = nfsd4_decode_authsys_parms(argp, cbs); 750 if (status) 751 return status; 752 break; 753 case RPC_AUTH_GSS: 754 status = nfsd4_decode_gss_cb_handles4(argp, cbs); 755 if (status) 756 return status; 757 break; 758 default: 759 return nfserr_inval; 760 } 761 } 762 763 return nfs_ok; 764 } 765 766 767 /* 768 * NFSv4 operation argument decoders 769 */ 770 771 static __be32 772 nfsd4_decode_access(struct nfsd4_compoundargs *argp, 773 union nfsd4_op_u *u) 774 { 775 struct nfsd4_access *access = &u->access; 776 if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0) 777 return nfserr_bad_xdr; 778 return nfs_ok; 779 } 780 781 static __be32 782 nfsd4_decode_close(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 783 { 784 struct nfsd4_close *close = &u->close; 785 if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0) 786 return nfserr_bad_xdr; 787 return nfsd4_decode_stateid4(argp, &close->cl_stateid); 788 } 789 790 791 static __be32 792 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 793 { 794 struct nfsd4_commit *commit = &u->commit; 795 if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0) 796 return nfserr_bad_xdr; 797 if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0) 798 return nfserr_bad_xdr; 799 memset(&commit->co_verf, 0, sizeof(commit->co_verf)); 800 return nfs_ok; 801 } 802 803 static __be32 804 nfsd4_decode_create(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 805 { 806 struct nfsd4_create *create = &u->create; 807 __be32 *p, status; 808 809 memset(create, 0, sizeof(*create)); 810 if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0) 811 return nfserr_bad_xdr; 812 switch (create->cr_type) { 813 case NF4LNK: 814 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0) 815 return nfserr_bad_xdr; 816 p = xdr_inline_decode(argp->xdr, create->cr_datalen); 817 if (!p) 818 return nfserr_bad_xdr; 819 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen); 820 if (!create->cr_data) 821 return nfserr_jukebox; 822 break; 823 case NF4BLK: 824 case NF4CHR: 825 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0) 826 return nfserr_bad_xdr; 827 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0) 828 return nfserr_bad_xdr; 829 break; 830 case NF4SOCK: 831 case NF4FIFO: 832 case NF4DIR: 833 default: 834 break; 835 } 836 status = nfsd4_decode_component4(argp, &create->cr_name, 837 &create->cr_namelen); 838 if (status) 839 return status; 840 status = nfsd4_decode_fattr4(argp, create->cr_bmval, 841 ARRAY_SIZE(create->cr_bmval), 842 &create->cr_iattr, &create->cr_acl, 843 &create->cr_label, &create->cr_umask); 844 if (status) 845 return status; 846 847 return nfs_ok; 848 } 849 850 static inline __be32 851 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 852 { 853 struct nfsd4_delegreturn *dr = &u->delegreturn; 854 return nfsd4_decode_stateid4(argp, &dr->dr_stateid); 855 } 856 857 static inline __be32 858 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 859 { 860 struct nfsd4_getattr *getattr = &u->getattr; 861 memset(getattr, 0, sizeof(*getattr)); 862 return nfsd4_decode_bitmap4(argp, getattr->ga_bmval, 863 ARRAY_SIZE(getattr->ga_bmval)); 864 } 865 866 static __be32 867 nfsd4_decode_link(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 868 { 869 struct nfsd4_link *link = &u->link; 870 memset(link, 0, sizeof(*link)); 871 return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen); 872 } 873 874 static __be32 875 nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp, 876 struct nfsd4_lock *lock) 877 { 878 __be32 status; 879 880 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0) 881 return nfserr_bad_xdr; 882 status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid); 883 if (status) 884 return status; 885 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0) 886 return nfserr_bad_xdr; 887 return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid, 888 &lock->lk_new_owner); 889 } 890 891 static __be32 892 nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp, 893 struct nfsd4_lock *lock) 894 { 895 __be32 status; 896 897 status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid); 898 if (status) 899 return status; 900 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0) 901 return nfserr_bad_xdr; 902 903 return nfs_ok; 904 } 905 906 static __be32 907 nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 908 { 909 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0) 910 return nfserr_bad_xdr; 911 if (lock->lk_is_new) 912 return nfsd4_decode_open_to_lock_owner4(argp, lock); 913 return nfsd4_decode_exist_lock_owner4(argp, lock); 914 } 915 916 static __be32 917 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 918 { 919 struct nfsd4_lock *lock = &u->lock; 920 memset(lock, 0, sizeof(*lock)); 921 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0) 922 return nfserr_bad_xdr; 923 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 924 return nfserr_bad_xdr; 925 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0) 926 return nfserr_bad_xdr; 927 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0) 928 return nfserr_bad_xdr; 929 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0) 930 return nfserr_bad_xdr; 931 return nfsd4_decode_locker4(argp, lock); 932 } 933 934 static __be32 935 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 936 { 937 struct nfsd4_lockt *lockt = &u->lockt; 938 memset(lockt, 0, sizeof(*lockt)); 939 if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0) 940 return nfserr_bad_xdr; 941 if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 942 return nfserr_bad_xdr; 943 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0) 944 return nfserr_bad_xdr; 945 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0) 946 return nfserr_bad_xdr; 947 return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid, 948 &lockt->lt_owner); 949 } 950 951 static __be32 952 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 953 { 954 struct nfsd4_locku *locku = &u->locku; 955 __be32 status; 956 957 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0) 958 return nfserr_bad_xdr; 959 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 960 return nfserr_bad_xdr; 961 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0) 962 return nfserr_bad_xdr; 963 status = nfsd4_decode_stateid4(argp, &locku->lu_stateid); 964 if (status) 965 return status; 966 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0) 967 return nfserr_bad_xdr; 968 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0) 969 return nfserr_bad_xdr; 970 971 return nfs_ok; 972 } 973 974 static __be32 975 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 976 { 977 struct nfsd4_lookup *lookup = &u->lookup; 978 return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len); 979 } 980 981 static __be32 982 nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 983 { 984 __be32 status; 985 986 if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0) 987 return nfserr_bad_xdr; 988 switch (open->op_createmode) { 989 case NFS4_CREATE_UNCHECKED: 990 case NFS4_CREATE_GUARDED: 991 status = nfsd4_decode_fattr4(argp, open->op_bmval, 992 ARRAY_SIZE(open->op_bmval), 993 &open->op_iattr, &open->op_acl, 994 &open->op_label, &open->op_umask); 995 if (status) 996 return status; 997 break; 998 case NFS4_CREATE_EXCLUSIVE: 999 status = nfsd4_decode_verifier4(argp, &open->op_verf); 1000 if (status) 1001 return status; 1002 break; 1003 case NFS4_CREATE_EXCLUSIVE4_1: 1004 if (argp->minorversion < 1) 1005 return nfserr_bad_xdr; 1006 status = nfsd4_decode_verifier4(argp, &open->op_verf); 1007 if (status) 1008 return status; 1009 status = nfsd4_decode_fattr4(argp, open->op_bmval, 1010 ARRAY_SIZE(open->op_bmval), 1011 &open->op_iattr, &open->op_acl, 1012 &open->op_label, &open->op_umask); 1013 if (status) 1014 return status; 1015 break; 1016 default: 1017 return nfserr_bad_xdr; 1018 } 1019 1020 return nfs_ok; 1021 } 1022 1023 static __be32 1024 nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 1025 { 1026 __be32 status; 1027 1028 if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0) 1029 return nfserr_bad_xdr; 1030 switch (open->op_create) { 1031 case NFS4_OPEN_NOCREATE: 1032 break; 1033 case NFS4_OPEN_CREATE: 1034 status = nfsd4_decode_createhow4(argp, open); 1035 if (status) 1036 return status; 1037 break; 1038 default: 1039 return nfserr_bad_xdr; 1040 } 1041 1042 return nfs_ok; 1043 } 1044 1045 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when) 1046 { 1047 u32 w; 1048 1049 if (xdr_stream_decode_u32(argp->xdr, &w) < 0) 1050 return nfserr_bad_xdr; 1051 *share_access = w & NFS4_SHARE_ACCESS_MASK; 1052 *deleg_want = w & NFS4_SHARE_WANT_MASK; 1053 if (deleg_when) 1054 *deleg_when = w & NFS4_SHARE_WHEN_MASK; 1055 1056 switch (w & NFS4_SHARE_ACCESS_MASK) { 1057 case NFS4_SHARE_ACCESS_READ: 1058 case NFS4_SHARE_ACCESS_WRITE: 1059 case NFS4_SHARE_ACCESS_BOTH: 1060 break; 1061 default: 1062 return nfserr_bad_xdr; 1063 } 1064 w &= ~NFS4_SHARE_ACCESS_MASK; 1065 if (!w) 1066 return nfs_ok; 1067 if (!argp->minorversion) 1068 return nfserr_bad_xdr; 1069 switch (w & NFS4_SHARE_WANT_MASK) { 1070 case NFS4_SHARE_WANT_NO_PREFERENCE: 1071 case NFS4_SHARE_WANT_READ_DELEG: 1072 case NFS4_SHARE_WANT_WRITE_DELEG: 1073 case NFS4_SHARE_WANT_ANY_DELEG: 1074 case NFS4_SHARE_WANT_NO_DELEG: 1075 case NFS4_SHARE_WANT_CANCEL: 1076 break; 1077 default: 1078 return nfserr_bad_xdr; 1079 } 1080 w &= ~NFS4_SHARE_WANT_MASK; 1081 if (!w) 1082 return nfs_ok; 1083 1084 if (!deleg_when) /* open_downgrade */ 1085 return nfserr_inval; 1086 switch (w) { 1087 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL: 1088 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED: 1089 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL | 1090 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED): 1091 return nfs_ok; 1092 } 1093 return nfserr_bad_xdr; 1094 } 1095 1096 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x) 1097 { 1098 if (xdr_stream_decode_u32(argp->xdr, x) < 0) 1099 return nfserr_bad_xdr; 1100 /* Note: unlike access bits, deny bits may be zero. */ 1101 if (*x & ~NFS4_SHARE_DENY_BOTH) 1102 return nfserr_bad_xdr; 1103 1104 return nfs_ok; 1105 } 1106 1107 static __be32 1108 nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp, 1109 struct nfsd4_open *open) 1110 { 1111 __be32 status; 1112 1113 if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0) 1114 return nfserr_bad_xdr; 1115 switch (open->op_claim_type) { 1116 case NFS4_OPEN_CLAIM_NULL: 1117 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1118 status = nfsd4_decode_component4(argp, &open->op_fname, 1119 &open->op_fnamelen); 1120 if (status) 1121 return status; 1122 break; 1123 case NFS4_OPEN_CLAIM_PREVIOUS: 1124 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0) 1125 return nfserr_bad_xdr; 1126 break; 1127 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1128 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid); 1129 if (status) 1130 return status; 1131 status = nfsd4_decode_component4(argp, &open->op_fname, 1132 &open->op_fnamelen); 1133 if (status) 1134 return status; 1135 break; 1136 case NFS4_OPEN_CLAIM_FH: 1137 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1138 if (argp->minorversion < 1) 1139 return nfserr_bad_xdr; 1140 /* void */ 1141 break; 1142 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1143 if (argp->minorversion < 1) 1144 return nfserr_bad_xdr; 1145 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid); 1146 if (status) 1147 return status; 1148 break; 1149 default: 1150 return nfserr_bad_xdr; 1151 } 1152 1153 return nfs_ok; 1154 } 1155 1156 static __be32 1157 nfsd4_decode_open(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1158 { 1159 struct nfsd4_open *open = &u->open; 1160 __be32 status; 1161 u32 dummy; 1162 1163 memset(open, 0, sizeof(*open)); 1164 1165 if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0) 1166 return nfserr_bad_xdr; 1167 /* deleg_want is ignored */ 1168 status = nfsd4_decode_share_access(argp, &open->op_share_access, 1169 &open->op_deleg_want, &dummy); 1170 if (status) 1171 return status; 1172 status = nfsd4_decode_share_deny(argp, &open->op_share_deny); 1173 if (status) 1174 return status; 1175 status = nfsd4_decode_state_owner4(argp, &open->op_clientid, 1176 &open->op_owner); 1177 if (status) 1178 return status; 1179 status = nfsd4_decode_openflag4(argp, open); 1180 if (status) 1181 return status; 1182 return nfsd4_decode_open_claim4(argp, open); 1183 } 1184 1185 static __be32 1186 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, 1187 union nfsd4_op_u *u) 1188 { 1189 struct nfsd4_open_confirm *open_conf = &u->open_confirm; 1190 __be32 status; 1191 1192 if (argp->minorversion >= 1) 1193 return nfserr_notsupp; 1194 1195 status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid); 1196 if (status) 1197 return status; 1198 if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0) 1199 return nfserr_bad_xdr; 1200 1201 memset(&open_conf->oc_resp_stateid, 0, 1202 sizeof(open_conf->oc_resp_stateid)); 1203 return nfs_ok; 1204 } 1205 1206 static __be32 1207 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, 1208 union nfsd4_op_u *u) 1209 { 1210 struct nfsd4_open_downgrade *open_down = &u->open_downgrade; 1211 __be32 status; 1212 1213 memset(open_down, 0, sizeof(*open_down)); 1214 status = nfsd4_decode_stateid4(argp, &open_down->od_stateid); 1215 if (status) 1216 return status; 1217 if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0) 1218 return nfserr_bad_xdr; 1219 /* deleg_want is ignored */ 1220 status = nfsd4_decode_share_access(argp, &open_down->od_share_access, 1221 &open_down->od_deleg_want, NULL); 1222 if (status) 1223 return status; 1224 return nfsd4_decode_share_deny(argp, &open_down->od_share_deny); 1225 } 1226 1227 static __be32 1228 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1229 { 1230 struct nfsd4_putfh *putfh = &u->putfh; 1231 __be32 *p; 1232 1233 if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0) 1234 return nfserr_bad_xdr; 1235 if (putfh->pf_fhlen > NFS4_FHSIZE) 1236 return nfserr_bad_xdr; 1237 p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen); 1238 if (!p) 1239 return nfserr_bad_xdr; 1240 putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen); 1241 if (!putfh->pf_fhval) 1242 return nfserr_jukebox; 1243 1244 putfh->no_verify = false; 1245 return nfs_ok; 1246 } 1247 1248 static __be32 1249 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p) 1250 { 1251 if (argp->minorversion == 0) 1252 return nfs_ok; 1253 return nfserr_notsupp; 1254 } 1255 1256 static __be32 1257 nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1258 { 1259 struct nfsd4_read *read = &u->read; 1260 __be32 status; 1261 1262 memset(read, 0, sizeof(*read)); 1263 status = nfsd4_decode_stateid4(argp, &read->rd_stateid); 1264 if (status) 1265 return status; 1266 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0) 1267 return nfserr_bad_xdr; 1268 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0) 1269 return nfserr_bad_xdr; 1270 1271 return nfs_ok; 1272 } 1273 1274 static __be32 1275 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1276 { 1277 struct nfsd4_readdir *readdir = &u->readdir; 1278 __be32 status; 1279 1280 memset(readdir, 0, sizeof(*readdir)); 1281 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0) 1282 return nfserr_bad_xdr; 1283 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf); 1284 if (status) 1285 return status; 1286 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0) 1287 return nfserr_bad_xdr; 1288 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0) 1289 return nfserr_bad_xdr; 1290 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval, 1291 ARRAY_SIZE(readdir->rd_bmval)) < 0) 1292 return nfserr_bad_xdr; 1293 1294 return nfs_ok; 1295 } 1296 1297 static __be32 1298 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1299 { 1300 struct nfsd4_remove *remove = &u->remove; 1301 memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo)); 1302 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen); 1303 } 1304 1305 static __be32 1306 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1307 { 1308 struct nfsd4_rename *rename = &u->rename; 1309 __be32 status; 1310 1311 memset(rename, 0, sizeof(*rename)); 1312 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen); 1313 if (status) 1314 return status; 1315 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen); 1316 } 1317 1318 static __be32 1319 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1320 { 1321 clientid_t *clientid = &u->renew; 1322 return nfsd4_decode_clientid4(argp, clientid); 1323 } 1324 1325 static __be32 1326 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp, 1327 union nfsd4_op_u *u) 1328 { 1329 struct nfsd4_secinfo *secinfo = &u->secinfo; 1330 secinfo->si_exp = NULL; 1331 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen); 1332 } 1333 1334 static __be32 1335 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1336 { 1337 struct nfsd4_setattr *setattr = &u->setattr; 1338 __be32 status; 1339 1340 memset(setattr, 0, sizeof(*setattr)); 1341 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid); 1342 if (status) 1343 return status; 1344 return nfsd4_decode_fattr4(argp, setattr->sa_bmval, 1345 ARRAY_SIZE(setattr->sa_bmval), 1346 &setattr->sa_iattr, &setattr->sa_acl, 1347 &setattr->sa_label, NULL); 1348 } 1349 1350 static __be32 1351 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1352 { 1353 struct nfsd4_setclientid *setclientid = &u->setclientid; 1354 __be32 *p, status; 1355 1356 memset(setclientid, 0, sizeof(*setclientid)); 1357 1358 if (argp->minorversion >= 1) 1359 return nfserr_notsupp; 1360 1361 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf); 1362 if (status) 1363 return status; 1364 status = nfsd4_decode_opaque(argp, &setclientid->se_name); 1365 if (status) 1366 return status; 1367 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0) 1368 return nfserr_bad_xdr; 1369 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0) 1370 return nfserr_bad_xdr; 1371 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len); 1372 if (!p) 1373 return nfserr_bad_xdr; 1374 setclientid->se_callback_netid_val = svcxdr_savemem(argp, p, 1375 setclientid->se_callback_netid_len); 1376 if (!setclientid->se_callback_netid_val) 1377 return nfserr_jukebox; 1378 1379 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0) 1380 return nfserr_bad_xdr; 1381 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len); 1382 if (!p) 1383 return nfserr_bad_xdr; 1384 setclientid->se_callback_addr_val = svcxdr_savemem(argp, p, 1385 setclientid->se_callback_addr_len); 1386 if (!setclientid->se_callback_addr_val) 1387 return nfserr_jukebox; 1388 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0) 1389 return nfserr_bad_xdr; 1390 1391 return nfs_ok; 1392 } 1393 1394 static __be32 1395 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, 1396 union nfsd4_op_u *u) 1397 { 1398 struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm; 1399 __be32 status; 1400 1401 if (argp->minorversion >= 1) 1402 return nfserr_notsupp; 1403 1404 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid); 1405 if (status) 1406 return status; 1407 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm); 1408 } 1409 1410 /* Also used for NVERIFY */ 1411 static __be32 1412 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1413 { 1414 struct nfsd4_verify *verify = &u->verify; 1415 __be32 *p, status; 1416 1417 memset(verify, 0, sizeof(*verify)); 1418 1419 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval, 1420 ARRAY_SIZE(verify->ve_bmval)); 1421 if (status) 1422 return status; 1423 1424 /* For convenience's sake, we compare raw xdr'd attributes in 1425 * nfsd4_proc_verify */ 1426 1427 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0) 1428 return nfserr_bad_xdr; 1429 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen); 1430 if (!p) 1431 return nfserr_bad_xdr; 1432 verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen); 1433 if (!verify->ve_attrval) 1434 return nfserr_jukebox; 1435 1436 return nfs_ok; 1437 } 1438 1439 static __be32 1440 nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1441 { 1442 struct nfsd4_write *write = &u->write; 1443 __be32 status; 1444 1445 status = nfsd4_decode_stateid4(argp, &write->wr_stateid); 1446 if (status) 1447 return status; 1448 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0) 1449 return nfserr_bad_xdr; 1450 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0) 1451 return nfserr_bad_xdr; 1452 if (write->wr_stable_how > NFS_FILE_SYNC) 1453 return nfserr_bad_xdr; 1454 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0) 1455 return nfserr_bad_xdr; 1456 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen)) 1457 return nfserr_bad_xdr; 1458 1459 write->wr_bytes_written = 0; 1460 write->wr_how_written = 0; 1461 memset(&write->wr_verifier, 0, sizeof(write->wr_verifier)); 1462 return nfs_ok; 1463 } 1464 1465 static __be32 1466 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, 1467 union nfsd4_op_u *u) 1468 { 1469 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner; 1470 __be32 status; 1471 1472 if (argp->minorversion >= 1) 1473 return nfserr_notsupp; 1474 1475 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid, 1476 &rlockowner->rl_owner); 1477 if (status) 1478 return status; 1479 1480 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid)) 1481 return nfserr_inval; 1482 1483 return nfs_ok; 1484 } 1485 1486 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, 1487 union nfsd4_op_u *u) 1488 { 1489 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl; 1490 memset(bc, 0, sizeof(*bc)); 1491 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0) 1492 return nfserr_bad_xdr; 1493 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec); 1494 } 1495 1496 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, 1497 union nfsd4_op_u *u) 1498 { 1499 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session; 1500 u32 use_conn_in_rdma_mode; 1501 __be32 status; 1502 1503 memset(bcts, 0, sizeof(*bcts)); 1504 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid); 1505 if (status) 1506 return status; 1507 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0) 1508 return nfserr_bad_xdr; 1509 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0) 1510 return nfserr_bad_xdr; 1511 1512 return nfs_ok; 1513 } 1514 1515 static __be32 1516 nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp, 1517 struct nfsd4_exchange_id *exid) 1518 { 1519 __be32 status; 1520 1521 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce, 1522 ARRAY_SIZE(exid->spo_must_enforce)); 1523 if (status) 1524 return nfserr_bad_xdr; 1525 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow, 1526 ARRAY_SIZE(exid->spo_must_allow)); 1527 if (status) 1528 return nfserr_bad_xdr; 1529 1530 return nfs_ok; 1531 } 1532 1533 /* 1534 * This implementation currently does not support SP4_SSV. 1535 * This decoder simply skips over these arguments. 1536 */ 1537 static noinline __be32 1538 nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp, 1539 struct nfsd4_exchange_id *exid) 1540 { 1541 u32 count, window, num_gss_handles; 1542 __be32 status; 1543 1544 /* ssp_ops */ 1545 status = nfsd4_decode_state_protect_ops(argp, exid); 1546 if (status) 1547 return status; 1548 1549 /* ssp_hash_algs<> */ 1550 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1551 return nfserr_bad_xdr; 1552 while (count--) { 1553 status = nfsd4_decode_ignored_string(argp, 0); 1554 if (status) 1555 return status; 1556 } 1557 1558 /* ssp_encr_algs<> */ 1559 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1560 return nfserr_bad_xdr; 1561 while (count--) { 1562 status = nfsd4_decode_ignored_string(argp, 0); 1563 if (status) 1564 return status; 1565 } 1566 1567 if (xdr_stream_decode_u32(argp->xdr, &window) < 0) 1568 return nfserr_bad_xdr; 1569 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0) 1570 return nfserr_bad_xdr; 1571 1572 return nfs_ok; 1573 } 1574 1575 static __be32 1576 nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp, 1577 struct nfsd4_exchange_id *exid) 1578 { 1579 __be32 status; 1580 1581 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0) 1582 return nfserr_bad_xdr; 1583 switch (exid->spa_how) { 1584 case SP4_NONE: 1585 break; 1586 case SP4_MACH_CRED: 1587 status = nfsd4_decode_state_protect_ops(argp, exid); 1588 if (status) 1589 return status; 1590 break; 1591 case SP4_SSV: 1592 status = nfsd4_decode_ssv_sp_parms(argp, exid); 1593 if (status) 1594 return status; 1595 break; 1596 default: 1597 return nfserr_bad_xdr; 1598 } 1599 1600 return nfs_ok; 1601 } 1602 1603 static __be32 1604 nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp, 1605 struct nfsd4_exchange_id *exid) 1606 { 1607 __be32 status; 1608 u32 count; 1609 1610 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1611 return nfserr_bad_xdr; 1612 switch (count) { 1613 case 0: 1614 break; 1615 case 1: 1616 /* Note that RFC 8881 places no length limit on 1617 * nii_domain, but this implementation permits no 1618 * more than NFS4_OPAQUE_LIMIT bytes */ 1619 status = nfsd4_decode_opaque(argp, &exid->nii_domain); 1620 if (status) 1621 return status; 1622 /* Note that RFC 8881 places no length limit on 1623 * nii_name, but this implementation permits no 1624 * more than NFS4_OPAQUE_LIMIT bytes */ 1625 status = nfsd4_decode_opaque(argp, &exid->nii_name); 1626 if (status) 1627 return status; 1628 status = nfsd4_decode_nfstime4(argp, &exid->nii_time); 1629 if (status) 1630 return status; 1631 break; 1632 default: 1633 return nfserr_bad_xdr; 1634 } 1635 1636 return nfs_ok; 1637 } 1638 1639 static __be32 1640 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp, 1641 union nfsd4_op_u *u) 1642 { 1643 struct nfsd4_exchange_id *exid = &u->exchange_id; 1644 __be32 status; 1645 1646 memset(exid, 0, sizeof(*exid)); 1647 status = nfsd4_decode_verifier4(argp, &exid->verifier); 1648 if (status) 1649 return status; 1650 status = nfsd4_decode_opaque(argp, &exid->clname); 1651 if (status) 1652 return status; 1653 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0) 1654 return nfserr_bad_xdr; 1655 status = nfsd4_decode_state_protect4_a(argp, exid); 1656 if (status) 1657 return status; 1658 return nfsd4_decode_nfs_impl_id4(argp, exid); 1659 } 1660 1661 static __be32 1662 nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp, 1663 struct nfsd4_channel_attrs *ca) 1664 { 1665 __be32 *p; 1666 1667 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7); 1668 if (!p) 1669 return nfserr_bad_xdr; 1670 1671 /* headerpadsz is ignored */ 1672 p++; 1673 ca->maxreq_sz = be32_to_cpup(p++); 1674 ca->maxresp_sz = be32_to_cpup(p++); 1675 ca->maxresp_cached = be32_to_cpup(p++); 1676 ca->maxops = be32_to_cpup(p++); 1677 ca->maxreqs = be32_to_cpup(p++); 1678 ca->nr_rdma_attrs = be32_to_cpup(p); 1679 switch (ca->nr_rdma_attrs) { 1680 case 0: 1681 break; 1682 case 1: 1683 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0) 1684 return nfserr_bad_xdr; 1685 break; 1686 default: 1687 return nfserr_bad_xdr; 1688 } 1689 1690 return nfs_ok; 1691 } 1692 1693 static __be32 1694 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, 1695 union nfsd4_op_u *u) 1696 { 1697 struct nfsd4_create_session *sess = &u->create_session; 1698 __be32 status; 1699 1700 memset(sess, 0, sizeof(*sess)); 1701 status = nfsd4_decode_clientid4(argp, &sess->clientid); 1702 if (status) 1703 return status; 1704 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0) 1705 return nfserr_bad_xdr; 1706 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0) 1707 return nfserr_bad_xdr; 1708 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel); 1709 if (status) 1710 return status; 1711 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel); 1712 if (status) 1713 return status; 1714 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0) 1715 return nfserr_bad_xdr; 1716 return nfsd4_decode_cb_sec(argp, &sess->cb_sec); 1717 } 1718 1719 static __be32 1720 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp, 1721 union nfsd4_op_u *u) 1722 { 1723 struct nfsd4_destroy_session *destroy_session = &u->destroy_session; 1724 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid); 1725 } 1726 1727 static __be32 1728 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp, 1729 union nfsd4_op_u *u) 1730 { 1731 struct nfsd4_free_stateid *free_stateid = &u->free_stateid; 1732 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid); 1733 } 1734 1735 static __be32 1736 nfsd4_decode_get_dir_delegation(struct nfsd4_compoundargs *argp, 1737 union nfsd4_op_u *u) 1738 { 1739 struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation; 1740 __be32 status; 1741 1742 memset(gdd, 0, sizeof(*gdd)); 1743 1744 if (xdr_stream_decode_bool(argp->xdr, &gdd->gdda_signal_deleg_avail) < 0) 1745 return nfserr_bad_xdr; 1746 status = nfsd4_decode_bitmap4(argp, gdd->gdda_notification_types, 1747 ARRAY_SIZE(gdd->gdda_notification_types)); 1748 if (status) 1749 return status; 1750 status = nfsd4_decode_nfstime4(argp, &gdd->gdda_child_attr_delay); 1751 if (status) 1752 return status; 1753 status = nfsd4_decode_nfstime4(argp, &gdd->gdda_dir_attr_delay); 1754 if (status) 1755 return status; 1756 status = nfsd4_decode_bitmap4(argp, gdd->gdda_child_attributes, 1757 ARRAY_SIZE(gdd->gdda_child_attributes)); 1758 if (status) 1759 return status; 1760 return nfsd4_decode_bitmap4(argp, gdd->gdda_dir_attributes, 1761 ARRAY_SIZE(gdd->gdda_dir_attributes)); 1762 } 1763 1764 #ifdef CONFIG_NFSD_PNFS 1765 static __be32 1766 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp, 1767 union nfsd4_op_u *u) 1768 { 1769 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo; 1770 __be32 status; 1771 1772 memset(gdev, 0, sizeof(*gdev)); 1773 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid); 1774 if (status) 1775 return status; 1776 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0) 1777 return nfserr_bad_xdr; 1778 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0) 1779 return nfserr_bad_xdr; 1780 if (xdr_stream_decode_uint32_array(argp->xdr, 1781 &gdev->gd_notify_types, 1) < 0) 1782 return nfserr_bad_xdr; 1783 1784 return nfs_ok; 1785 } 1786 1787 static __be32 1788 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp, 1789 union nfsd4_op_u *u) 1790 { 1791 struct nfsd4_layoutcommit *lcp = &u->layoutcommit; 1792 __be32 *p, status; 1793 1794 memset(lcp, 0, sizeof(*lcp)); 1795 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0) 1796 return nfserr_bad_xdr; 1797 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0) 1798 return nfserr_bad_xdr; 1799 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0) 1800 return nfserr_bad_xdr; 1801 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid); 1802 if (status) 1803 return status; 1804 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0) 1805 return nfserr_bad_xdr; 1806 if (lcp->lc_newoffset) { 1807 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0) 1808 return nfserr_bad_xdr; 1809 } else 1810 lcp->lc_last_wr = 0; 1811 p = xdr_inline_decode(argp->xdr, XDR_UNIT); 1812 if (!p) 1813 return nfserr_bad_xdr; 1814 if (xdr_item_is_present(p)) { 1815 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime); 1816 if (status) 1817 return status; 1818 } else { 1819 lcp->lc_mtime.tv_nsec = UTIME_NOW; 1820 } 1821 return nfsd4_decode_layoutupdate4(argp, lcp); 1822 } 1823 1824 static __be32 1825 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp, 1826 union nfsd4_op_u *u) 1827 { 1828 struct nfsd4_layoutget *lgp = &u->layoutget; 1829 __be32 status; 1830 1831 memset(lgp, 0, sizeof(*lgp)); 1832 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0) 1833 return nfserr_bad_xdr; 1834 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0) 1835 return nfserr_bad_xdr; 1836 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0) 1837 return nfserr_bad_xdr; 1838 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0) 1839 return nfserr_bad_xdr; 1840 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0) 1841 return nfserr_bad_xdr; 1842 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0) 1843 return nfserr_bad_xdr; 1844 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid); 1845 if (status) 1846 return status; 1847 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0) 1848 return nfserr_bad_xdr; 1849 1850 return nfs_ok; 1851 } 1852 1853 static __be32 1854 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp, 1855 union nfsd4_op_u *u) 1856 { 1857 struct nfsd4_layoutreturn *lrp = &u->layoutreturn; 1858 memset(lrp, 0, sizeof(*lrp)); 1859 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0) 1860 return nfserr_bad_xdr; 1861 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0) 1862 return nfserr_bad_xdr; 1863 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0) 1864 return nfserr_bad_xdr; 1865 return nfsd4_decode_layoutreturn4(argp, lrp); 1866 } 1867 #endif /* CONFIG_NFSD_PNFS */ 1868 1869 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp, 1870 union nfsd4_op_u *u) 1871 { 1872 struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name; 1873 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0) 1874 return nfserr_bad_xdr; 1875 1876 sin->sin_exp = NULL; 1877 return nfs_ok; 1878 } 1879 1880 static __be32 1881 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp, 1882 union nfsd4_op_u *u) 1883 { 1884 struct nfsd4_sequence *seq = &u->sequence; 1885 __be32 *p, status; 1886 1887 status = nfsd4_decode_sessionid4(argp, &seq->sessionid); 1888 if (status) 1889 return status; 1890 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4); 1891 if (!p) 1892 return nfserr_bad_xdr; 1893 seq->seqid = be32_to_cpup(p++); 1894 seq->slotid = be32_to_cpup(p++); 1895 seq->maxslots = be32_to_cpup(p++); 1896 seq->cachethis = be32_to_cpup(p); 1897 1898 seq->status_flags = 0; 1899 return nfs_ok; 1900 } 1901 1902 static __be32 1903 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, 1904 union nfsd4_op_u *u) 1905 { 1906 struct nfsd4_test_stateid *test_stateid = &u->test_stateid; 1907 struct nfsd4_test_stateid_id *stateid; 1908 __be32 status; 1909 u32 i; 1910 1911 memset(test_stateid, 0, sizeof(*test_stateid)); 1912 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0) 1913 return nfserr_bad_xdr; 1914 1915 INIT_LIST_HEAD(&test_stateid->ts_stateid_list); 1916 for (i = 0; i < test_stateid->ts_num_ids; i++) { 1917 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); 1918 if (!stateid) 1919 return nfserr_jukebox; 1920 INIT_LIST_HEAD(&stateid->ts_id_list); 1921 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); 1922 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid); 1923 if (status) 1924 return status; 1925 } 1926 1927 return nfs_ok; 1928 } 1929 1930 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, 1931 union nfsd4_op_u *u) 1932 { 1933 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid; 1934 return nfsd4_decode_clientid4(argp, &dc->clientid); 1935 } 1936 1937 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, 1938 union nfsd4_op_u *u) 1939 { 1940 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete; 1941 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0) 1942 return nfserr_bad_xdr; 1943 return nfs_ok; 1944 } 1945 1946 static __be32 1947 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp, 1948 union nfsd4_op_u *u) 1949 { 1950 struct nfsd4_fallocate *fallocate = &u->allocate; 1951 __be32 status; 1952 1953 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid); 1954 if (status) 1955 return status; 1956 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0) 1957 return nfserr_bad_xdr; 1958 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0) 1959 return nfserr_bad_xdr; 1960 1961 return nfs_ok; 1962 } 1963 1964 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp, 1965 struct nl4_server *ns) 1966 { 1967 struct nfs42_netaddr *naddr; 1968 __be32 *p; 1969 1970 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0) 1971 return nfserr_bad_xdr; 1972 1973 /* currently support for 1 inter-server source server */ 1974 switch (ns->nl4_type) { 1975 case NL4_NETADDR: 1976 naddr = &ns->u.nl4_addr; 1977 1978 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0) 1979 return nfserr_bad_xdr; 1980 if (naddr->netid_len > RPCBIND_MAXNETIDLEN) 1981 return nfserr_bad_xdr; 1982 1983 p = xdr_inline_decode(argp->xdr, naddr->netid_len); 1984 if (!p) 1985 return nfserr_bad_xdr; 1986 memcpy(naddr->netid, p, naddr->netid_len); 1987 1988 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0) 1989 return nfserr_bad_xdr; 1990 if (naddr->addr_len > RPCBIND_MAXUADDRLEN) 1991 return nfserr_bad_xdr; 1992 1993 p = xdr_inline_decode(argp->xdr, naddr->addr_len); 1994 if (!p) 1995 return nfserr_bad_xdr; 1996 memcpy(naddr->addr, p, naddr->addr_len); 1997 break; 1998 default: 1999 return nfserr_bad_xdr; 2000 } 2001 2002 return nfs_ok; 2003 } 2004 2005 static __be32 2006 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 2007 { 2008 struct nfsd4_copy *copy = &u->copy; 2009 u32 consecutive, i, count, sync; 2010 struct nl4_server *ns_dummy; 2011 __be32 status; 2012 2013 memset(copy, 0, sizeof(*copy)); 2014 status = nfsd4_decode_stateid4(argp, ©->cp_src_stateid); 2015 if (status) 2016 return status; 2017 status = nfsd4_decode_stateid4(argp, ©->cp_dst_stateid); 2018 if (status) 2019 return status; 2020 if (xdr_stream_decode_u64(argp->xdr, ©->cp_src_pos) < 0) 2021 return nfserr_bad_xdr; 2022 if (xdr_stream_decode_u64(argp->xdr, ©->cp_dst_pos) < 0) 2023 return nfserr_bad_xdr; 2024 if (xdr_stream_decode_u64(argp->xdr, ©->cp_count) < 0) 2025 return nfserr_bad_xdr; 2026 /* ca_consecutive: we always do consecutive copies */ 2027 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0) 2028 return nfserr_bad_xdr; 2029 if (xdr_stream_decode_bool(argp->xdr, &sync) < 0) 2030 return nfserr_bad_xdr; 2031 nfsd4_copy_set_sync(copy, sync); 2032 2033 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 2034 return nfserr_bad_xdr; 2035 copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src)); 2036 if (copy->cp_src == NULL) 2037 return nfserr_jukebox; 2038 if (count == 0) { /* intra-server copy */ 2039 __set_bit(NFSD4_COPY_F_INTRA, ©->cp_flags); 2040 return nfs_ok; 2041 } 2042 2043 /* decode all the supplied server addresses but use only the first */ 2044 status = nfsd4_decode_nl4_server(argp, copy->cp_src); 2045 if (status) 2046 return status; 2047 2048 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL); 2049 if (ns_dummy == NULL) 2050 return nfserr_jukebox; 2051 for (i = 0; i < count - 1; i++) { 2052 status = nfsd4_decode_nl4_server(argp, ns_dummy); 2053 if (status) { 2054 kfree(ns_dummy); 2055 return status; 2056 } 2057 } 2058 kfree(ns_dummy); 2059 2060 return nfs_ok; 2061 } 2062 2063 static __be32 2064 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp, 2065 union nfsd4_op_u *u) 2066 { 2067 struct nfsd4_copy_notify *cn = &u->copy_notify; 2068 __be32 status; 2069 2070 memset(cn, 0, sizeof(*cn)); 2071 cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src)); 2072 if (cn->cpn_src == NULL) 2073 return nfserr_jukebox; 2074 cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst)); 2075 if (cn->cpn_dst == NULL) 2076 return nfserr_jukebox; 2077 2078 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid); 2079 if (status) 2080 return status; 2081 return nfsd4_decode_nl4_server(argp, cn->cpn_dst); 2082 } 2083 2084 static __be32 2085 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp, 2086 union nfsd4_op_u *u) 2087 { 2088 struct nfsd4_offload_status *os = &u->offload_status; 2089 os->count = 0; 2090 os->status = 0; 2091 return nfsd4_decode_stateid4(argp, &os->stateid); 2092 } 2093 2094 static __be32 2095 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 2096 { 2097 struct nfsd4_seek *seek = &u->seek; 2098 __be32 status; 2099 2100 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid); 2101 if (status) 2102 return status; 2103 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0) 2104 return nfserr_bad_xdr; 2105 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0) 2106 return nfserr_bad_xdr; 2107 2108 seek->seek_eof = 0; 2109 seek->seek_pos = 0; 2110 return nfs_ok; 2111 } 2112 2113 static __be32 2114 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 2115 { 2116 struct nfsd4_clone *clone = &u->clone; 2117 __be32 status; 2118 2119 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid); 2120 if (status) 2121 return status; 2122 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid); 2123 if (status) 2124 return status; 2125 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0) 2126 return nfserr_bad_xdr; 2127 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0) 2128 return nfserr_bad_xdr; 2129 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0) 2130 return nfserr_bad_xdr; 2131 2132 return nfs_ok; 2133 } 2134 2135 /* 2136 * XDR data that is more than PAGE_SIZE in size is normally part of a 2137 * read or write. However, the size of extended attributes is limited 2138 * by the maximum request size, and then further limited by the underlying 2139 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX 2140 * is 64k). Since there is no kvec- or page-based interface to xattrs, 2141 * and we're not dealing with contiguous pages, we need to do some copying. 2142 */ 2143 2144 /* 2145 * Decode data into buffer. 2146 */ 2147 static __be32 2148 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr, 2149 char **bufp, size_t buflen) 2150 { 2151 struct page **pages = xdr->pages; 2152 struct kvec *head = xdr->head; 2153 char *tmp, *dp; 2154 u32 len; 2155 2156 if (buflen <= head->iov_len) { 2157 /* 2158 * We're in luck, the head has enough space. Just return 2159 * the head, no need for copying. 2160 */ 2161 *bufp = head->iov_base; 2162 return 0; 2163 } 2164 2165 tmp = svcxdr_tmpalloc(argp, buflen); 2166 if (tmp == NULL) 2167 return nfserr_jukebox; 2168 2169 dp = tmp; 2170 memcpy(dp, head->iov_base, head->iov_len); 2171 buflen -= head->iov_len; 2172 dp += head->iov_len; 2173 2174 while (buflen > 0) { 2175 len = min_t(u32, buflen, PAGE_SIZE); 2176 memcpy(dp, page_address(*pages), len); 2177 2178 buflen -= len; 2179 dp += len; 2180 pages++; 2181 } 2182 2183 *bufp = tmp; 2184 return 0; 2185 } 2186 2187 /* 2188 * Get a user extended attribute name from the XDR buffer. 2189 * It will not have the "user." prefix, so prepend it. 2190 * Lastly, check for nul characters in the name. 2191 */ 2192 static __be32 2193 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep) 2194 { 2195 char *name, *sp, *dp; 2196 u32 namelen, cnt; 2197 __be32 *p; 2198 2199 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0) 2200 return nfserr_bad_xdr; 2201 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN)) 2202 return nfserr_nametoolong; 2203 if (namelen == 0) 2204 return nfserr_bad_xdr; 2205 p = xdr_inline_decode(argp->xdr, namelen); 2206 if (!p) 2207 return nfserr_bad_xdr; 2208 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1); 2209 if (!name) 2210 return nfserr_jukebox; 2211 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); 2212 2213 /* 2214 * Copy the extended attribute name over while checking for 0 2215 * characters. 2216 */ 2217 sp = (char *)p; 2218 dp = name + XATTR_USER_PREFIX_LEN; 2219 cnt = namelen; 2220 2221 while (cnt-- > 0) { 2222 if (*sp == '\0') 2223 return nfserr_bad_xdr; 2224 *dp++ = *sp++; 2225 } 2226 *dp = '\0'; 2227 2228 *namep = name; 2229 2230 return nfs_ok; 2231 } 2232 2233 /* 2234 * A GETXATTR op request comes without a length specifier. We just set the 2235 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum 2236 * channel reply size. nfsd_getxattr will probe the length of the xattr, 2237 * check it against getxa_len, and allocate + return the value. 2238 */ 2239 static __be32 2240 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp, 2241 union nfsd4_op_u *u) 2242 { 2243 struct nfsd4_getxattr *getxattr = &u->getxattr; 2244 __be32 status; 2245 u32 maxcount; 2246 2247 memset(getxattr, 0, sizeof(*getxattr)); 2248 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name); 2249 if (status) 2250 return status; 2251 2252 maxcount = svc_max_payload(argp->rqstp); 2253 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2254 2255 getxattr->getxa_len = maxcount; 2256 return nfs_ok; 2257 } 2258 2259 static __be32 2260 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp, 2261 union nfsd4_op_u *u) 2262 { 2263 struct nfsd4_setxattr *setxattr = &u->setxattr; 2264 u32 flags, maxcount, size; 2265 __be32 status; 2266 2267 memset(setxattr, 0, sizeof(*setxattr)); 2268 2269 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0) 2270 return nfserr_bad_xdr; 2271 2272 if (flags > SETXATTR4_REPLACE) 2273 return nfserr_inval; 2274 setxattr->setxa_flags = flags; 2275 2276 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name); 2277 if (status) 2278 return status; 2279 2280 maxcount = svc_max_payload(argp->rqstp); 2281 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2282 2283 if (xdr_stream_decode_u32(argp->xdr, &size) < 0) 2284 return nfserr_bad_xdr; 2285 if (size > maxcount) 2286 return nfserr_xattr2big; 2287 2288 setxattr->setxa_len = size; 2289 if (size > 0) { 2290 struct xdr_buf payload; 2291 2292 if (!xdr_stream_subsegment(argp->xdr, &payload, size)) 2293 return nfserr_bad_xdr; 2294 status = nfsd4_vbuf_from_vector(argp, &payload, 2295 &setxattr->setxa_buf, size); 2296 } 2297 2298 return nfs_ok; 2299 } 2300 2301 static __be32 2302 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp, 2303 union nfsd4_op_u *u) 2304 { 2305 struct nfsd4_listxattrs *listxattrs = &u->listxattrs; 2306 u32 maxcount; 2307 2308 memset(listxattrs, 0, sizeof(*listxattrs)); 2309 2310 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0) 2311 return nfserr_bad_xdr; 2312 2313 /* 2314 * If the cookie is too large to have even one user.x attribute 2315 * plus trailing '\0' left in a maximum size buffer, it's invalid. 2316 */ 2317 if (listxattrs->lsxa_cookie >= 2318 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2))) 2319 return nfserr_badcookie; 2320 2321 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0) 2322 return nfserr_bad_xdr; 2323 if (maxcount < 8) 2324 /* Always need at least 2 words (length and one character) */ 2325 return nfserr_inval; 2326 2327 maxcount = min(maxcount, svc_max_payload(argp->rqstp)); 2328 listxattrs->lsxa_maxcount = maxcount; 2329 2330 return nfs_ok; 2331 } 2332 2333 static __be32 2334 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp, 2335 union nfsd4_op_u *u) 2336 { 2337 struct nfsd4_removexattr *removexattr = &u->removexattr; 2338 memset(removexattr, 0, sizeof(*removexattr)); 2339 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name); 2340 } 2341 2342 static __be32 2343 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p) 2344 { 2345 return nfs_ok; 2346 } 2347 2348 static __be32 2349 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p) 2350 { 2351 return nfserr_notsupp; 2352 } 2353 2354 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u); 2355 2356 static const nfsd4_dec nfsd4_dec_ops[] = { 2357 [OP_ACCESS] = nfsd4_decode_access, 2358 [OP_CLOSE] = nfsd4_decode_close, 2359 [OP_COMMIT] = nfsd4_decode_commit, 2360 [OP_CREATE] = nfsd4_decode_create, 2361 [OP_DELEGPURGE] = nfsd4_decode_notsupp, 2362 [OP_DELEGRETURN] = nfsd4_decode_delegreturn, 2363 [OP_GETATTR] = nfsd4_decode_getattr, 2364 [OP_GETFH] = nfsd4_decode_noop, 2365 [OP_LINK] = nfsd4_decode_link, 2366 [OP_LOCK] = nfsd4_decode_lock, 2367 [OP_LOCKT] = nfsd4_decode_lockt, 2368 [OP_LOCKU] = nfsd4_decode_locku, 2369 [OP_LOOKUP] = nfsd4_decode_lookup, 2370 [OP_LOOKUPP] = nfsd4_decode_noop, 2371 [OP_NVERIFY] = nfsd4_decode_verify, 2372 [OP_OPEN] = nfsd4_decode_open, 2373 [OP_OPENATTR] = nfsd4_decode_notsupp, 2374 [OP_OPEN_CONFIRM] = nfsd4_decode_open_confirm, 2375 [OP_OPEN_DOWNGRADE] = nfsd4_decode_open_downgrade, 2376 [OP_PUTFH] = nfsd4_decode_putfh, 2377 [OP_PUTPUBFH] = nfsd4_decode_putpubfh, 2378 [OP_PUTROOTFH] = nfsd4_decode_noop, 2379 [OP_READ] = nfsd4_decode_read, 2380 [OP_READDIR] = nfsd4_decode_readdir, 2381 [OP_READLINK] = nfsd4_decode_noop, 2382 [OP_REMOVE] = nfsd4_decode_remove, 2383 [OP_RENAME] = nfsd4_decode_rename, 2384 [OP_RENEW] = nfsd4_decode_renew, 2385 [OP_RESTOREFH] = nfsd4_decode_noop, 2386 [OP_SAVEFH] = nfsd4_decode_noop, 2387 [OP_SECINFO] = nfsd4_decode_secinfo, 2388 [OP_SETATTR] = nfsd4_decode_setattr, 2389 [OP_SETCLIENTID] = nfsd4_decode_setclientid, 2390 [OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm, 2391 [OP_VERIFY] = nfsd4_decode_verify, 2392 [OP_WRITE] = nfsd4_decode_write, 2393 [OP_RELEASE_LOCKOWNER] = nfsd4_decode_release_lockowner, 2394 2395 /* new operations for NFSv4.1 */ 2396 [OP_BACKCHANNEL_CTL] = nfsd4_decode_backchannel_ctl, 2397 [OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session, 2398 [OP_EXCHANGE_ID] = nfsd4_decode_exchange_id, 2399 [OP_CREATE_SESSION] = nfsd4_decode_create_session, 2400 [OP_DESTROY_SESSION] = nfsd4_decode_destroy_session, 2401 [OP_FREE_STATEID] = nfsd4_decode_free_stateid, 2402 [OP_GET_DIR_DELEGATION] = nfsd4_decode_get_dir_delegation, 2403 #ifdef CONFIG_NFSD_PNFS 2404 [OP_GETDEVICEINFO] = nfsd4_decode_getdeviceinfo, 2405 [OP_GETDEVICELIST] = nfsd4_decode_notsupp, 2406 [OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit, 2407 [OP_LAYOUTGET] = nfsd4_decode_layoutget, 2408 [OP_LAYOUTRETURN] = nfsd4_decode_layoutreturn, 2409 #else 2410 [OP_GETDEVICEINFO] = nfsd4_decode_notsupp, 2411 [OP_GETDEVICELIST] = nfsd4_decode_notsupp, 2412 [OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp, 2413 [OP_LAYOUTGET] = nfsd4_decode_notsupp, 2414 [OP_LAYOUTRETURN] = nfsd4_decode_notsupp, 2415 #endif 2416 [OP_SECINFO_NO_NAME] = nfsd4_decode_secinfo_no_name, 2417 [OP_SEQUENCE] = nfsd4_decode_sequence, 2418 [OP_SET_SSV] = nfsd4_decode_notsupp, 2419 [OP_TEST_STATEID] = nfsd4_decode_test_stateid, 2420 [OP_WANT_DELEGATION] = nfsd4_decode_notsupp, 2421 [OP_DESTROY_CLIENTID] = nfsd4_decode_destroy_clientid, 2422 [OP_RECLAIM_COMPLETE] = nfsd4_decode_reclaim_complete, 2423 2424 /* new operations for NFSv4.2 */ 2425 [OP_ALLOCATE] = nfsd4_decode_fallocate, 2426 [OP_COPY] = nfsd4_decode_copy, 2427 [OP_COPY_NOTIFY] = nfsd4_decode_copy_notify, 2428 [OP_DEALLOCATE] = nfsd4_decode_fallocate, 2429 [OP_IO_ADVISE] = nfsd4_decode_notsupp, 2430 [OP_LAYOUTERROR] = nfsd4_decode_notsupp, 2431 [OP_LAYOUTSTATS] = nfsd4_decode_notsupp, 2432 [OP_OFFLOAD_CANCEL] = nfsd4_decode_offload_status, 2433 [OP_OFFLOAD_STATUS] = nfsd4_decode_offload_status, 2434 [OP_READ_PLUS] = nfsd4_decode_read, 2435 [OP_SEEK] = nfsd4_decode_seek, 2436 [OP_WRITE_SAME] = nfsd4_decode_notsupp, 2437 [OP_CLONE] = nfsd4_decode_clone, 2438 /* RFC 8276 extended atributes operations */ 2439 [OP_GETXATTR] = nfsd4_decode_getxattr, 2440 [OP_SETXATTR] = nfsd4_decode_setxattr, 2441 [OP_LISTXATTRS] = nfsd4_decode_listxattrs, 2442 [OP_REMOVEXATTR] = nfsd4_decode_removexattr, 2443 }; 2444 2445 static inline bool 2446 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op) 2447 { 2448 if (op->opnum < FIRST_NFS4_OP) 2449 return false; 2450 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP) 2451 return false; 2452 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP) 2453 return false; 2454 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP) 2455 return false; 2456 return true; 2457 } 2458 2459 static bool 2460 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 2461 { 2462 struct nfsd4_op *op; 2463 bool cachethis = false; 2464 int auth_slack= argp->rqstp->rq_auth_slack; 2465 int max_reply = auth_slack + 8; /* opcnt, status */ 2466 int readcount = 0; 2467 int readbytes = 0; 2468 __be32 *p; 2469 int i; 2470 2471 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0) 2472 return false; 2473 max_reply += XDR_UNIT; 2474 argp->tag = NULL; 2475 if (unlikely(argp->taglen)) { 2476 if (argp->taglen > NFSD4_MAX_TAGLEN) 2477 return false; 2478 p = xdr_inline_decode(argp->xdr, argp->taglen); 2479 if (!p) 2480 return false; 2481 argp->tag = svcxdr_savemem(argp, p, argp->taglen); 2482 if (!argp->tag) 2483 return false; 2484 max_reply += xdr_align_size(argp->taglen); 2485 } 2486 2487 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0) 2488 return false; 2489 if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0) 2490 return false; 2491 argp->opcnt = min_t(u32, argp->client_opcnt, 2492 NFSD_MAX_OPS_PER_COMPOUND); 2493 2494 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { 2495 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops)); 2496 if (!argp->ops) { 2497 argp->ops = argp->iops; 2498 return false; 2499 } 2500 } 2501 2502 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 2503 argp->opcnt = 0; 2504 2505 for (i = 0; i < argp->opcnt; i++) { 2506 op = &argp->ops[i]; 2507 op->replay = NULL; 2508 op->opdesc = NULL; 2509 2510 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0) 2511 return false; 2512 if (nfsd4_opnum_in_range(argp, op)) { 2513 op->opdesc = OPDESC(op); 2514 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u); 2515 if (op->status != nfs_ok) 2516 trace_nfsd_compound_decode_err(argp->rqstp, 2517 argp->opcnt, i, 2518 op->opnum, 2519 op->status); 2520 } else { 2521 op->opnum = OP_ILLEGAL; 2522 op->status = nfserr_op_illegal; 2523 } 2524 2525 /* 2526 * We'll try to cache the result in the DRC if any one 2527 * op in the compound wants to be cached: 2528 */ 2529 cachethis |= nfsd4_cache_this_op(op); 2530 2531 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) { 2532 readcount++; 2533 readbytes += nfsd4_max_reply(argp->rqstp, op); 2534 } else 2535 max_reply += nfsd4_max_reply(argp->rqstp, op); 2536 /* 2537 * OP_LOCK and OP_LOCKT may return a conflicting lock. 2538 * (Special case because it will just skip encoding this 2539 * if it runs out of xdr buffer space, and it is the only 2540 * operation that behaves this way.) 2541 */ 2542 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT) 2543 max_reply += NFS4_OPAQUE_LIMIT; 2544 2545 if (op->status) { 2546 argp->opcnt = i+1; 2547 break; 2548 } 2549 } 2550 /* Sessions make the DRC unnecessary: */ 2551 if (argp->minorversion) 2552 cachethis = false; 2553 svc_reserve(argp->rqstp, max_reply + readbytes); 2554 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE; 2555 2556 argp->splice_ok = nfsd_read_splice_ok(argp->rqstp); 2557 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack) 2558 argp->splice_ok = false; 2559 2560 return true; 2561 } 2562 2563 static __be32 nfsd4_encode_nfs_fh4(struct xdr_stream *xdr, 2564 struct knfsd_fh *fh_handle) 2565 { 2566 return nfsd4_encode_opaque(xdr, fh_handle->fh_raw, fh_handle->fh_size); 2567 } 2568 2569 /* This is a frequently-encoded type; open-coded for speed */ 2570 static __be32 nfsd4_encode_nfstime4(struct xdr_stream *xdr, 2571 const struct timespec64 *tv) 2572 { 2573 __be32 *p; 2574 2575 p = xdr_reserve_space(xdr, XDR_UNIT * 3); 2576 if (!p) 2577 return nfserr_resource; 2578 p = xdr_encode_hyper(p, tv->tv_sec); 2579 *p = cpu_to_be32(tv->tv_nsec); 2580 return nfs_ok; 2581 } 2582 2583 static __be32 nfsd4_encode_specdata4(struct xdr_stream *xdr, 2584 unsigned int major, unsigned int minor) 2585 { 2586 __be32 status; 2587 2588 status = nfsd4_encode_uint32_t(xdr, major); 2589 if (status != nfs_ok) 2590 return status; 2591 return nfsd4_encode_uint32_t(xdr, minor); 2592 } 2593 2594 static __be32 2595 nfsd4_encode_change_info4(struct xdr_stream *xdr, const struct nfsd4_change_info *c) 2596 { 2597 __be32 status; 2598 2599 status = nfsd4_encode_bool(xdr, c->atomic); 2600 if (status != nfs_ok) 2601 return status; 2602 status = nfsd4_encode_changeid4(xdr, c->before_change); 2603 if (status != nfs_ok) 2604 return status; 2605 return nfsd4_encode_changeid4(xdr, c->after_change); 2606 } 2607 2608 static __be32 nfsd4_encode_netaddr4(struct xdr_stream *xdr, 2609 const struct nfs42_netaddr *addr) 2610 { 2611 __be32 status; 2612 2613 /* na_r_netid */ 2614 status = nfsd4_encode_opaque(xdr, addr->netid, addr->netid_len); 2615 if (status != nfs_ok) 2616 return status; 2617 /* na_r_addr */ 2618 return nfsd4_encode_opaque(xdr, addr->addr, addr->addr_len); 2619 } 2620 2621 /* Encode as an array of strings the string given with components 2622 * separated @sep, escaped with esc_enter and esc_exit. 2623 */ 2624 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep, 2625 char *components, char esc_enter, 2626 char esc_exit) 2627 { 2628 __be32 *p; 2629 __be32 pathlen; 2630 int pathlen_offset; 2631 int strlen, count=0; 2632 char *str, *end, *next; 2633 2634 dprintk("nfsd4_encode_components(%s)\n", components); 2635 2636 pathlen_offset = xdr->buf->len; 2637 p = xdr_reserve_space(xdr, 4); 2638 if (!p) 2639 return nfserr_resource; 2640 p++; /* We will fill this in with @count later */ 2641 2642 end = str = components; 2643 while (*end) { 2644 bool found_esc = false; 2645 2646 /* try to parse as esc_start, ..., esc_end, sep */ 2647 if (*str == esc_enter) { 2648 for (; *end && (*end != esc_exit); end++) 2649 /* find esc_exit or end of string */; 2650 next = end + 1; 2651 if (*end && (!*next || *next == sep)) { 2652 str++; 2653 found_esc = true; 2654 } 2655 } 2656 2657 if (!found_esc) 2658 for (; *end && (*end != sep); end++) 2659 /* find sep or end of string */; 2660 2661 strlen = end - str; 2662 if (strlen) { 2663 p = xdr_reserve_space(xdr, strlen + 4); 2664 if (!p) 2665 return nfserr_resource; 2666 p = xdr_encode_opaque(p, str, strlen); 2667 count++; 2668 } 2669 else 2670 end++; 2671 if (found_esc) 2672 end = next; 2673 2674 str = end; 2675 } 2676 pathlen = htonl(count); 2677 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4); 2678 return 0; 2679 } 2680 2681 /* Encode as an array of strings the string given with components 2682 * separated @sep. 2683 */ 2684 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep, 2685 char *components) 2686 { 2687 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0); 2688 } 2689 2690 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr, 2691 struct nfsd4_fs_location *location) 2692 { 2693 __be32 status; 2694 2695 status = nfsd4_encode_components_esc(xdr, ':', location->hosts, 2696 '[', ']'); 2697 if (status) 2698 return status; 2699 status = nfsd4_encode_components(xdr, '/', location->path); 2700 if (status) 2701 return status; 2702 return nfs_ok; 2703 } 2704 2705 static __be32 nfsd4_encode_pathname4(struct xdr_stream *xdr, 2706 const struct path *root, 2707 const struct path *path) 2708 { 2709 struct path cur = *path; 2710 __be32 *p; 2711 struct dentry **components = NULL; 2712 unsigned int ncomponents = 0; 2713 __be32 err = nfserr_jukebox; 2714 2715 dprintk("nfsd4_encode_components("); 2716 2717 path_get(&cur); 2718 /* First walk the path up to the nfsd root, and store the 2719 * dentries/path components in an array. 2720 */ 2721 for (;;) { 2722 if (path_equal(&cur, root)) 2723 break; 2724 if (cur.dentry == cur.mnt->mnt_root) { 2725 if (follow_up(&cur)) 2726 continue; 2727 goto out_free; 2728 } 2729 if ((ncomponents & 15) == 0) { 2730 struct dentry **new; 2731 new = krealloc(components, 2732 sizeof(*new) * (ncomponents + 16), 2733 GFP_KERNEL); 2734 if (!new) 2735 goto out_free; 2736 components = new; 2737 } 2738 components[ncomponents++] = cur.dentry; 2739 cur.dentry = dget_parent(cur.dentry); 2740 } 2741 err = nfserr_resource; 2742 p = xdr_reserve_space(xdr, 4); 2743 if (!p) 2744 goto out_free; 2745 *p++ = cpu_to_be32(ncomponents); 2746 2747 while (ncomponents) { 2748 struct dentry *dentry = components[ncomponents - 1]; 2749 unsigned int len; 2750 2751 spin_lock(&dentry->d_lock); 2752 len = dentry->d_name.len; 2753 p = xdr_reserve_space(xdr, len + 4); 2754 if (!p) { 2755 spin_unlock(&dentry->d_lock); 2756 goto out_free; 2757 } 2758 p = xdr_encode_opaque(p, dentry->d_name.name, len); 2759 dprintk("/%pd", dentry); 2760 spin_unlock(&dentry->d_lock); 2761 dput(dentry); 2762 ncomponents--; 2763 } 2764 2765 err = 0; 2766 out_free: 2767 dprintk(")\n"); 2768 while (ncomponents) 2769 dput(components[--ncomponents]); 2770 kfree(components); 2771 path_put(&cur); 2772 return err; 2773 } 2774 2775 static __be32 nfsd4_encode_fs_locations4(struct xdr_stream *xdr, 2776 struct svc_rqst *rqstp, 2777 struct svc_export *exp) 2778 { 2779 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; 2780 struct svc_export *exp_ps; 2781 unsigned int i; 2782 __be32 status; 2783 2784 /* fs_root */ 2785 exp_ps = rqst_find_fsidzero_export(rqstp); 2786 if (IS_ERR(exp_ps)) 2787 return nfserrno(PTR_ERR(exp_ps)); 2788 status = nfsd4_encode_pathname4(xdr, &exp_ps->ex_path, &exp->ex_path); 2789 exp_put(exp_ps); 2790 if (status != nfs_ok) 2791 return status; 2792 2793 /* locations<> */ 2794 if (xdr_stream_encode_u32(xdr, fslocs->locations_count) != XDR_UNIT) 2795 return nfserr_resource; 2796 for (i = 0; i < fslocs->locations_count; i++) { 2797 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]); 2798 if (status != nfs_ok) 2799 return status; 2800 } 2801 2802 return nfs_ok; 2803 } 2804 2805 static __be32 nfsd4_encode_nfsace4(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2806 struct nfs4_ace *ace) 2807 { 2808 __be32 status; 2809 2810 /* type */ 2811 status = nfsd4_encode_acetype4(xdr, ace->type); 2812 if (status != nfs_ok) 2813 return nfserr_resource; 2814 /* flag */ 2815 status = nfsd4_encode_aceflag4(xdr, ace->flag); 2816 if (status != nfs_ok) 2817 return nfserr_resource; 2818 /* access mask */ 2819 status = nfsd4_encode_acemask4(xdr, ace->access_mask & NFS4_ACE_MASK_ALL); 2820 if (status != nfs_ok) 2821 return nfserr_resource; 2822 /* who */ 2823 if (ace->whotype != NFS4_ACL_WHO_NAMED) 2824 return nfs4_acl_write_who(xdr, ace->whotype); 2825 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 2826 return nfsd4_encode_group(xdr, rqstp, ace->who_gid); 2827 return nfsd4_encode_user(xdr, rqstp, ace->who_uid); 2828 } 2829 2830 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ 2831 FATTR4_WORD0_RDATTR_ERROR) 2832 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID 2833 #define WORD2_ABSENT_FS_ATTRS 0 2834 2835 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2836 static inline __be32 2837 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2838 void *context, int len) 2839 { 2840 __be32 *p; 2841 2842 p = xdr_reserve_space(xdr, len + 4 + 4 + 4); 2843 if (!p) 2844 return nfserr_resource; 2845 2846 /* 2847 * For now we use a 0 here to indicate the null translation; in 2848 * the future we may place a call to translation code here. 2849 */ 2850 *p++ = cpu_to_be32(0); /* lfs */ 2851 *p++ = cpu_to_be32(0); /* pi */ 2852 p = xdr_encode_opaque(p, context, len); 2853 return 0; 2854 } 2855 #else 2856 static inline __be32 2857 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2858 void *context, int len) 2859 { return 0; } 2860 #endif 2861 2862 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err) 2863 { 2864 /* As per referral draft: */ 2865 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || 2866 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { 2867 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || 2868 *bmval0 & FATTR4_WORD0_FS_LOCATIONS) 2869 *rdattr_err = NFSERR_MOVED; 2870 else 2871 return nfserr_moved; 2872 } 2873 *bmval0 &= WORD0_ABSENT_FS_ATTRS; 2874 *bmval1 &= WORD1_ABSENT_FS_ATTRS; 2875 *bmval2 &= WORD2_ABSENT_FS_ATTRS; 2876 return 0; 2877 } 2878 2879 2880 static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino) 2881 { 2882 struct path path = exp->ex_path; 2883 struct kstat stat; 2884 int err; 2885 2886 path_get(&path); 2887 while (follow_up(&path)) { 2888 if (path.dentry != path.mnt->mnt_root) 2889 break; 2890 } 2891 err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT); 2892 path_put(&path); 2893 if (!err) 2894 *pino = stat.ino; 2895 return err; 2896 } 2897 2898 static __be32 2899 nfsd4_encode_bitmap4(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2) 2900 { 2901 __be32 *p; 2902 2903 if (bmval2) { 2904 p = xdr_reserve_space(xdr, XDR_UNIT * 4); 2905 if (!p) 2906 goto out_resource; 2907 *p++ = cpu_to_be32(3); 2908 *p++ = cpu_to_be32(bmval0); 2909 *p++ = cpu_to_be32(bmval1); 2910 *p++ = cpu_to_be32(bmval2); 2911 } else if (bmval1) { 2912 p = xdr_reserve_space(xdr, XDR_UNIT * 3); 2913 if (!p) 2914 goto out_resource; 2915 *p++ = cpu_to_be32(2); 2916 *p++ = cpu_to_be32(bmval0); 2917 *p++ = cpu_to_be32(bmval1); 2918 } else { 2919 p = xdr_reserve_space(xdr, XDR_UNIT * 2); 2920 if (!p) 2921 goto out_resource; 2922 *p++ = cpu_to_be32(1); 2923 *p++ = cpu_to_be32(bmval0); 2924 } 2925 2926 return nfs_ok; 2927 out_resource: 2928 return nfserr_resource; 2929 } 2930 2931 struct nfsd4_fattr_args { 2932 struct svc_rqst *rqstp; 2933 struct svc_fh *fhp; 2934 struct svc_export *exp; 2935 struct dentry *dentry; 2936 struct kstat stat; 2937 struct kstatfs statfs; 2938 struct nfs4_acl *acl; 2939 u64 size; 2940 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2941 void *context; 2942 int contextlen; 2943 #endif 2944 u32 rdattr_err; 2945 bool contextsupport; 2946 bool ignore_crossmnt; 2947 }; 2948 2949 typedef __be32(*nfsd4_enc_attr)(struct xdr_stream *xdr, 2950 const struct nfsd4_fattr_args *args); 2951 2952 static __be32 nfsd4_encode_fattr4__noop(struct xdr_stream *xdr, 2953 const struct nfsd4_fattr_args *args) 2954 { 2955 return nfs_ok; 2956 } 2957 2958 static __be32 nfsd4_encode_fattr4__true(struct xdr_stream *xdr, 2959 const struct nfsd4_fattr_args *args) 2960 { 2961 return nfsd4_encode_bool(xdr, true); 2962 } 2963 2964 static __be32 nfsd4_encode_fattr4__false(struct xdr_stream *xdr, 2965 const struct nfsd4_fattr_args *args) 2966 { 2967 return nfsd4_encode_bool(xdr, false); 2968 } 2969 2970 static __be32 nfsd4_encode_fattr4_supported_attrs(struct xdr_stream *xdr, 2971 const struct nfsd4_fattr_args *args) 2972 { 2973 struct nfsd4_compoundres *resp = args->rqstp->rq_resp; 2974 u32 minorversion = resp->cstate.minorversion; 2975 u32 supp[3]; 2976 2977 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2978 if (!IS_POSIXACL(d_inode(args->dentry))) 2979 supp[0] &= ~FATTR4_WORD0_ACL; 2980 if (!args->contextsupport) 2981 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2982 2983 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]); 2984 } 2985 2986 static __be32 nfsd4_encode_fattr4_type(struct xdr_stream *xdr, 2987 const struct nfsd4_fattr_args *args) 2988 { 2989 __be32 *p; 2990 2991 p = xdr_reserve_space(xdr, XDR_UNIT); 2992 if (!p) 2993 return nfserr_resource; 2994 2995 switch (args->stat.mode & S_IFMT) { 2996 case S_IFIFO: 2997 *p = cpu_to_be32(NF4FIFO); 2998 break; 2999 case S_IFCHR: 3000 *p = cpu_to_be32(NF4CHR); 3001 break; 3002 case S_IFDIR: 3003 *p = cpu_to_be32(NF4DIR); 3004 break; 3005 case S_IFBLK: 3006 *p = cpu_to_be32(NF4BLK); 3007 break; 3008 case S_IFLNK: 3009 *p = cpu_to_be32(NF4LNK); 3010 break; 3011 case S_IFREG: 3012 *p = cpu_to_be32(NF4REG); 3013 break; 3014 case S_IFSOCK: 3015 *p = cpu_to_be32(NF4SOCK); 3016 break; 3017 default: 3018 return nfserr_serverfault; 3019 } 3020 3021 return nfs_ok; 3022 } 3023 3024 static __be32 nfsd4_encode_fattr4_fh_expire_type(struct xdr_stream *xdr, 3025 const struct nfsd4_fattr_args *args) 3026 { 3027 u32 mask; 3028 3029 mask = NFS4_FH_PERSISTENT; 3030 if (!(args->exp->ex_flags & NFSEXP_NOSUBTREECHECK)) 3031 mask |= NFS4_FH_VOL_RENAME; 3032 return nfsd4_encode_uint32_t(xdr, mask); 3033 } 3034 3035 static __be32 nfsd4_encode_fattr4_change(struct xdr_stream *xdr, 3036 const struct nfsd4_fattr_args *args) 3037 { 3038 const struct svc_export *exp = args->exp; 3039 u64 c; 3040 3041 if (unlikely(exp->ex_flags & NFSEXP_V4ROOT)) { 3042 u32 flush_time = convert_to_wallclock(exp->cd->flush_time); 3043 3044 if (xdr_stream_encode_u32(xdr, flush_time) != XDR_UNIT) 3045 return nfserr_resource; 3046 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT) 3047 return nfserr_resource; 3048 return nfs_ok; 3049 } 3050 3051 c = nfsd4_change_attribute(&args->stat, d_inode(args->dentry)); 3052 return nfsd4_encode_changeid4(xdr, c); 3053 } 3054 3055 static __be32 nfsd4_encode_fattr4_size(struct xdr_stream *xdr, 3056 const struct nfsd4_fattr_args *args) 3057 { 3058 return nfsd4_encode_uint64_t(xdr, args->size); 3059 } 3060 3061 static __be32 nfsd4_encode_fattr4_fsid(struct xdr_stream *xdr, 3062 const struct nfsd4_fattr_args *args) 3063 { 3064 __be32 *p; 3065 3066 p = xdr_reserve_space(xdr, XDR_UNIT * 2 + XDR_UNIT * 2); 3067 if (!p) 3068 return nfserr_resource; 3069 3070 if (unlikely(args->exp->ex_fslocs.migrated)) { 3071 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR); 3072 xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR); 3073 return nfs_ok; 3074 } 3075 switch (fsid_source(args->fhp)) { 3076 case FSIDSOURCE_FSID: 3077 p = xdr_encode_hyper(p, (u64)args->exp->ex_fsid); 3078 xdr_encode_hyper(p, (u64)0); 3079 break; 3080 case FSIDSOURCE_DEV: 3081 *p++ = xdr_zero; 3082 *p++ = cpu_to_be32(MAJOR(args->stat.dev)); 3083 *p++ = xdr_zero; 3084 *p = cpu_to_be32(MINOR(args->stat.dev)); 3085 break; 3086 case FSIDSOURCE_UUID: 3087 xdr_encode_opaque_fixed(p, args->exp->ex_uuid, EX_UUID_LEN); 3088 break; 3089 } 3090 3091 return nfs_ok; 3092 } 3093 3094 static __be32 nfsd4_encode_fattr4_lease_time(struct xdr_stream *xdr, 3095 const struct nfsd4_fattr_args *args) 3096 { 3097 struct nfsd_net *nn = net_generic(SVC_NET(args->rqstp), nfsd_net_id); 3098 3099 return nfsd4_encode_nfs_lease4(xdr, nn->nfsd4_lease); 3100 } 3101 3102 static __be32 nfsd4_encode_fattr4_rdattr_error(struct xdr_stream *xdr, 3103 const struct nfsd4_fattr_args *args) 3104 { 3105 return nfsd4_encode_uint32_t(xdr, args->rdattr_err); 3106 } 3107 3108 static __be32 nfsd4_encode_fattr4_aclsupport(struct xdr_stream *xdr, 3109 const struct nfsd4_fattr_args *args) 3110 { 3111 u32 mask; 3112 3113 mask = 0; 3114 if (IS_POSIXACL(d_inode(args->dentry))) 3115 mask = ACL4_SUPPORT_ALLOW_ACL | ACL4_SUPPORT_DENY_ACL; 3116 return nfsd4_encode_uint32_t(xdr, mask); 3117 } 3118 3119 static __be32 nfsd4_encode_fattr4_acl(struct xdr_stream *xdr, 3120 const struct nfsd4_fattr_args *args) 3121 { 3122 struct nfs4_acl *acl = args->acl; 3123 struct nfs4_ace *ace; 3124 __be32 status; 3125 3126 /* nfsace4<> */ 3127 if (!acl) { 3128 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT) 3129 return nfserr_resource; 3130 } else { 3131 if (xdr_stream_encode_u32(xdr, acl->naces) != XDR_UNIT) 3132 return nfserr_resource; 3133 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 3134 status = nfsd4_encode_nfsace4(xdr, args->rqstp, ace); 3135 if (status != nfs_ok) 3136 return status; 3137 } 3138 } 3139 return nfs_ok; 3140 } 3141 3142 static __be32 nfsd4_encode_fattr4_filehandle(struct xdr_stream *xdr, 3143 const struct nfsd4_fattr_args *args) 3144 { 3145 return nfsd4_encode_nfs_fh4(xdr, &args->fhp->fh_handle); 3146 } 3147 3148 static __be32 nfsd4_encode_fattr4_fileid(struct xdr_stream *xdr, 3149 const struct nfsd4_fattr_args *args) 3150 { 3151 return nfsd4_encode_uint64_t(xdr, args->stat.ino); 3152 } 3153 3154 static __be32 nfsd4_encode_fattr4_files_avail(struct xdr_stream *xdr, 3155 const struct nfsd4_fattr_args *args) 3156 { 3157 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree); 3158 } 3159 3160 static __be32 nfsd4_encode_fattr4_files_free(struct xdr_stream *xdr, 3161 const struct nfsd4_fattr_args *args) 3162 { 3163 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree); 3164 } 3165 3166 static __be32 nfsd4_encode_fattr4_files_total(struct xdr_stream *xdr, 3167 const struct nfsd4_fattr_args *args) 3168 { 3169 return nfsd4_encode_uint64_t(xdr, args->statfs.f_files); 3170 } 3171 3172 static __be32 nfsd4_encode_fattr4_fs_locations(struct xdr_stream *xdr, 3173 const struct nfsd4_fattr_args *args) 3174 { 3175 return nfsd4_encode_fs_locations4(xdr, args->rqstp, args->exp); 3176 } 3177 3178 static __be32 nfsd4_encode_fattr4_maxfilesize(struct xdr_stream *xdr, 3179 const struct nfsd4_fattr_args *args) 3180 { 3181 struct super_block *sb = args->exp->ex_path.mnt->mnt_sb; 3182 3183 return nfsd4_encode_uint64_t(xdr, sb->s_maxbytes); 3184 } 3185 3186 static __be32 nfsd4_encode_fattr4_maxlink(struct xdr_stream *xdr, 3187 const struct nfsd4_fattr_args *args) 3188 { 3189 return nfsd4_encode_uint32_t(xdr, 255); 3190 } 3191 3192 static __be32 nfsd4_encode_fattr4_maxname(struct xdr_stream *xdr, 3193 const struct nfsd4_fattr_args *args) 3194 { 3195 return nfsd4_encode_uint32_t(xdr, args->statfs.f_namelen); 3196 } 3197 3198 static __be32 nfsd4_encode_fattr4_maxread(struct xdr_stream *xdr, 3199 const struct nfsd4_fattr_args *args) 3200 { 3201 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp)); 3202 } 3203 3204 static __be32 nfsd4_encode_fattr4_maxwrite(struct xdr_stream *xdr, 3205 const struct nfsd4_fattr_args *args) 3206 { 3207 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp)); 3208 } 3209 3210 static __be32 nfsd4_encode_fattr4_mode(struct xdr_stream *xdr, 3211 const struct nfsd4_fattr_args *args) 3212 { 3213 return nfsd4_encode_mode4(xdr, args->stat.mode & S_IALLUGO); 3214 } 3215 3216 static __be32 nfsd4_encode_fattr4_numlinks(struct xdr_stream *xdr, 3217 const struct nfsd4_fattr_args *args) 3218 { 3219 return nfsd4_encode_uint32_t(xdr, args->stat.nlink); 3220 } 3221 3222 static __be32 nfsd4_encode_fattr4_owner(struct xdr_stream *xdr, 3223 const struct nfsd4_fattr_args *args) 3224 { 3225 return nfsd4_encode_user(xdr, args->rqstp, args->stat.uid); 3226 } 3227 3228 static __be32 nfsd4_encode_fattr4_owner_group(struct xdr_stream *xdr, 3229 const struct nfsd4_fattr_args *args) 3230 { 3231 return nfsd4_encode_group(xdr, args->rqstp, args->stat.gid); 3232 } 3233 3234 static __be32 nfsd4_encode_fattr4_rawdev(struct xdr_stream *xdr, 3235 const struct nfsd4_fattr_args *args) 3236 { 3237 return nfsd4_encode_specdata4(xdr, MAJOR(args->stat.rdev), 3238 MINOR(args->stat.rdev)); 3239 } 3240 3241 static __be32 nfsd4_encode_fattr4_space_avail(struct xdr_stream *xdr, 3242 const struct nfsd4_fattr_args *args) 3243 { 3244 u64 avail = (u64)args->statfs.f_bavail * (u64)args->statfs.f_bsize; 3245 3246 return nfsd4_encode_uint64_t(xdr, avail); 3247 } 3248 3249 static __be32 nfsd4_encode_fattr4_space_free(struct xdr_stream *xdr, 3250 const struct nfsd4_fattr_args *args) 3251 { 3252 u64 free = (u64)args->statfs.f_bfree * (u64)args->statfs.f_bsize; 3253 3254 return nfsd4_encode_uint64_t(xdr, free); 3255 } 3256 3257 static __be32 nfsd4_encode_fattr4_space_total(struct xdr_stream *xdr, 3258 const struct nfsd4_fattr_args *args) 3259 { 3260 u64 total = (u64)args->statfs.f_blocks * (u64)args->statfs.f_bsize; 3261 3262 return nfsd4_encode_uint64_t(xdr, total); 3263 } 3264 3265 static __be32 nfsd4_encode_fattr4_space_used(struct xdr_stream *xdr, 3266 const struct nfsd4_fattr_args *args) 3267 { 3268 return nfsd4_encode_uint64_t(xdr, (u64)args->stat.blocks << 9); 3269 } 3270 3271 static __be32 nfsd4_encode_fattr4_time_access(struct xdr_stream *xdr, 3272 const struct nfsd4_fattr_args *args) 3273 { 3274 return nfsd4_encode_nfstime4(xdr, &args->stat.atime); 3275 } 3276 3277 static __be32 nfsd4_encode_fattr4_time_create(struct xdr_stream *xdr, 3278 const struct nfsd4_fattr_args *args) 3279 { 3280 return nfsd4_encode_nfstime4(xdr, &args->stat.btime); 3281 } 3282 3283 /* 3284 * ctime (in NFSv4, time_metadata) is not writeable, and the client 3285 * doesn't really care what resolution could theoretically be stored by 3286 * the filesystem. 3287 * 3288 * The client cares how close together changes can be while still 3289 * guaranteeing ctime changes. For most filesystems (which have 3290 * timestamps with nanosecond fields) that is limited by the resolution 3291 * of the time returned from current_time() (which I'm assuming to be 3292 * 1/HZ). 3293 */ 3294 static __be32 nfsd4_encode_fattr4_time_delta(struct xdr_stream *xdr, 3295 const struct nfsd4_fattr_args *args) 3296 { 3297 const struct inode *inode = d_inode(args->dentry); 3298 u32 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran); 3299 struct timespec64 ts = ns_to_timespec64(ns); 3300 3301 return nfsd4_encode_nfstime4(xdr, &ts); 3302 } 3303 3304 static __be32 nfsd4_encode_fattr4_time_metadata(struct xdr_stream *xdr, 3305 const struct nfsd4_fattr_args *args) 3306 { 3307 return nfsd4_encode_nfstime4(xdr, &args->stat.ctime); 3308 } 3309 3310 static __be32 nfsd4_encode_fattr4_time_modify(struct xdr_stream *xdr, 3311 const struct nfsd4_fattr_args *args) 3312 { 3313 return nfsd4_encode_nfstime4(xdr, &args->stat.mtime); 3314 } 3315 3316 static __be32 nfsd4_encode_fattr4_mounted_on_fileid(struct xdr_stream *xdr, 3317 const struct nfsd4_fattr_args *args) 3318 { 3319 u64 ino; 3320 int err; 3321 3322 if (!args->ignore_crossmnt && 3323 args->dentry == args->exp->ex_path.mnt->mnt_root) { 3324 err = nfsd4_get_mounted_on_ino(args->exp, &ino); 3325 if (err) 3326 return nfserrno(err); 3327 } else 3328 ino = args->stat.ino; 3329 3330 return nfsd4_encode_uint64_t(xdr, ino); 3331 } 3332 3333 #ifdef CONFIG_NFSD_PNFS 3334 3335 static __be32 nfsd4_encode_fattr4_fs_layout_types(struct xdr_stream *xdr, 3336 const struct nfsd4_fattr_args *args) 3337 { 3338 unsigned long mask = args->exp->ex_layout_types; 3339 int i; 3340 3341 /* Hamming weight of @mask is the number of layout types to return */ 3342 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT) 3343 return nfserr_resource; 3344 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 3345 if (mask & BIT(i)) { 3346 /* layouttype4 */ 3347 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT) 3348 return nfserr_resource; 3349 } 3350 return nfs_ok; 3351 } 3352 3353 static __be32 nfsd4_encode_fattr4_layout_types(struct xdr_stream *xdr, 3354 const struct nfsd4_fattr_args *args) 3355 { 3356 unsigned long mask = args->exp->ex_layout_types; 3357 int i; 3358 3359 /* Hamming weight of @mask is the number of layout types to return */ 3360 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT) 3361 return nfserr_resource; 3362 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 3363 if (mask & BIT(i)) { 3364 /* layouttype4 */ 3365 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT) 3366 return nfserr_resource; 3367 } 3368 return nfs_ok; 3369 } 3370 3371 static __be32 nfsd4_encode_fattr4_layout_blksize(struct xdr_stream *xdr, 3372 const struct nfsd4_fattr_args *args) 3373 { 3374 return nfsd4_encode_uint32_t(xdr, args->stat.blksize); 3375 } 3376 3377 #endif 3378 3379 static __be32 nfsd4_encode_fattr4_suppattr_exclcreat(struct xdr_stream *xdr, 3380 const struct nfsd4_fattr_args *args) 3381 { 3382 struct nfsd4_compoundres *resp = args->rqstp->rq_resp; 3383 u32 supp[3]; 3384 3385 memcpy(supp, nfsd_suppattrs[resp->cstate.minorversion], sizeof(supp)); 3386 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0; 3387 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1; 3388 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2; 3389 3390 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]); 3391 } 3392 3393 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3394 static __be32 nfsd4_encode_fattr4_sec_label(struct xdr_stream *xdr, 3395 const struct nfsd4_fattr_args *args) 3396 { 3397 return nfsd4_encode_security_label(xdr, args->rqstp, 3398 args->context, args->contextlen); 3399 } 3400 #endif 3401 3402 static __be32 nfsd4_encode_fattr4_xattr_support(struct xdr_stream *xdr, 3403 const struct nfsd4_fattr_args *args) 3404 { 3405 int err = xattr_supports_user_prefix(d_inode(args->dentry)); 3406 3407 return nfsd4_encode_bool(xdr, err == 0); 3408 } 3409 3410 static const nfsd4_enc_attr nfsd4_enc_fattr4_encode_ops[] = { 3411 [FATTR4_SUPPORTED_ATTRS] = nfsd4_encode_fattr4_supported_attrs, 3412 [FATTR4_TYPE] = nfsd4_encode_fattr4_type, 3413 [FATTR4_FH_EXPIRE_TYPE] = nfsd4_encode_fattr4_fh_expire_type, 3414 [FATTR4_CHANGE] = nfsd4_encode_fattr4_change, 3415 [FATTR4_SIZE] = nfsd4_encode_fattr4_size, 3416 [FATTR4_LINK_SUPPORT] = nfsd4_encode_fattr4__true, 3417 [FATTR4_SYMLINK_SUPPORT] = nfsd4_encode_fattr4__true, 3418 [FATTR4_NAMED_ATTR] = nfsd4_encode_fattr4__false, 3419 [FATTR4_FSID] = nfsd4_encode_fattr4_fsid, 3420 [FATTR4_UNIQUE_HANDLES] = nfsd4_encode_fattr4__true, 3421 [FATTR4_LEASE_TIME] = nfsd4_encode_fattr4_lease_time, 3422 [FATTR4_RDATTR_ERROR] = nfsd4_encode_fattr4_rdattr_error, 3423 [FATTR4_ACL] = nfsd4_encode_fattr4_acl, 3424 [FATTR4_ACLSUPPORT] = nfsd4_encode_fattr4_aclsupport, 3425 [FATTR4_ARCHIVE] = nfsd4_encode_fattr4__noop, 3426 [FATTR4_CANSETTIME] = nfsd4_encode_fattr4__true, 3427 [FATTR4_CASE_INSENSITIVE] = nfsd4_encode_fattr4__false, 3428 [FATTR4_CASE_PRESERVING] = nfsd4_encode_fattr4__true, 3429 [FATTR4_CHOWN_RESTRICTED] = nfsd4_encode_fattr4__true, 3430 [FATTR4_FILEHANDLE] = nfsd4_encode_fattr4_filehandle, 3431 [FATTR4_FILEID] = nfsd4_encode_fattr4_fileid, 3432 [FATTR4_FILES_AVAIL] = nfsd4_encode_fattr4_files_avail, 3433 [FATTR4_FILES_FREE] = nfsd4_encode_fattr4_files_free, 3434 [FATTR4_FILES_TOTAL] = nfsd4_encode_fattr4_files_total, 3435 [FATTR4_FS_LOCATIONS] = nfsd4_encode_fattr4_fs_locations, 3436 [FATTR4_HIDDEN] = nfsd4_encode_fattr4__noop, 3437 [FATTR4_HOMOGENEOUS] = nfsd4_encode_fattr4__true, 3438 [FATTR4_MAXFILESIZE] = nfsd4_encode_fattr4_maxfilesize, 3439 [FATTR4_MAXLINK] = nfsd4_encode_fattr4_maxlink, 3440 [FATTR4_MAXNAME] = nfsd4_encode_fattr4_maxname, 3441 [FATTR4_MAXREAD] = nfsd4_encode_fattr4_maxread, 3442 [FATTR4_MAXWRITE] = nfsd4_encode_fattr4_maxwrite, 3443 [FATTR4_MIMETYPE] = nfsd4_encode_fattr4__noop, 3444 [FATTR4_MODE] = nfsd4_encode_fattr4_mode, 3445 [FATTR4_NO_TRUNC] = nfsd4_encode_fattr4__true, 3446 [FATTR4_NUMLINKS] = nfsd4_encode_fattr4_numlinks, 3447 [FATTR4_OWNER] = nfsd4_encode_fattr4_owner, 3448 [FATTR4_OWNER_GROUP] = nfsd4_encode_fattr4_owner_group, 3449 [FATTR4_QUOTA_AVAIL_HARD] = nfsd4_encode_fattr4__noop, 3450 [FATTR4_QUOTA_AVAIL_SOFT] = nfsd4_encode_fattr4__noop, 3451 [FATTR4_QUOTA_USED] = nfsd4_encode_fattr4__noop, 3452 [FATTR4_RAWDEV] = nfsd4_encode_fattr4_rawdev, 3453 [FATTR4_SPACE_AVAIL] = nfsd4_encode_fattr4_space_avail, 3454 [FATTR4_SPACE_FREE] = nfsd4_encode_fattr4_space_free, 3455 [FATTR4_SPACE_TOTAL] = nfsd4_encode_fattr4_space_total, 3456 [FATTR4_SPACE_USED] = nfsd4_encode_fattr4_space_used, 3457 [FATTR4_SYSTEM] = nfsd4_encode_fattr4__noop, 3458 [FATTR4_TIME_ACCESS] = nfsd4_encode_fattr4_time_access, 3459 [FATTR4_TIME_ACCESS_SET] = nfsd4_encode_fattr4__noop, 3460 [FATTR4_TIME_BACKUP] = nfsd4_encode_fattr4__noop, 3461 [FATTR4_TIME_CREATE] = nfsd4_encode_fattr4_time_create, 3462 [FATTR4_TIME_DELTA] = nfsd4_encode_fattr4_time_delta, 3463 [FATTR4_TIME_METADATA] = nfsd4_encode_fattr4_time_metadata, 3464 [FATTR4_TIME_MODIFY] = nfsd4_encode_fattr4_time_modify, 3465 [FATTR4_TIME_MODIFY_SET] = nfsd4_encode_fattr4__noop, 3466 [FATTR4_MOUNTED_ON_FILEID] = nfsd4_encode_fattr4_mounted_on_fileid, 3467 [FATTR4_DIR_NOTIF_DELAY] = nfsd4_encode_fattr4__noop, 3468 [FATTR4_DIRENT_NOTIF_DELAY] = nfsd4_encode_fattr4__noop, 3469 [FATTR4_DACL] = nfsd4_encode_fattr4__noop, 3470 [FATTR4_SACL] = nfsd4_encode_fattr4__noop, 3471 [FATTR4_CHANGE_POLICY] = nfsd4_encode_fattr4__noop, 3472 [FATTR4_FS_STATUS] = nfsd4_encode_fattr4__noop, 3473 3474 #ifdef CONFIG_NFSD_PNFS 3475 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4_fs_layout_types, 3476 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop, 3477 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4_layout_types, 3478 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4_layout_blksize, 3479 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop, 3480 #else 3481 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop, 3482 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop, 3483 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop, 3484 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4__noop, 3485 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop, 3486 #endif 3487 3488 [FATTR4_FS_LOCATIONS_INFO] = nfsd4_encode_fattr4__noop, 3489 [FATTR4_MDSTHRESHOLD] = nfsd4_encode_fattr4__noop, 3490 [FATTR4_RETENTION_GET] = nfsd4_encode_fattr4__noop, 3491 [FATTR4_RETENTION_SET] = nfsd4_encode_fattr4__noop, 3492 [FATTR4_RETENTEVT_GET] = nfsd4_encode_fattr4__noop, 3493 [FATTR4_RETENTEVT_SET] = nfsd4_encode_fattr4__noop, 3494 [FATTR4_RETENTION_HOLD] = nfsd4_encode_fattr4__noop, 3495 [FATTR4_MODE_SET_MASKED] = nfsd4_encode_fattr4__noop, 3496 [FATTR4_SUPPATTR_EXCLCREAT] = nfsd4_encode_fattr4_suppattr_exclcreat, 3497 [FATTR4_FS_CHARSET_CAP] = nfsd4_encode_fattr4__noop, 3498 [FATTR4_CLONE_BLKSIZE] = nfsd4_encode_fattr4__noop, 3499 [FATTR4_SPACE_FREED] = nfsd4_encode_fattr4__noop, 3500 [FATTR4_CHANGE_ATTR_TYPE] = nfsd4_encode_fattr4__noop, 3501 3502 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3503 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4_sec_label, 3504 #else 3505 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4__noop, 3506 #endif 3507 3508 [FATTR4_MODE_UMASK] = nfsd4_encode_fattr4__noop, 3509 [FATTR4_XATTR_SUPPORT] = nfsd4_encode_fattr4_xattr_support, 3510 }; 3511 3512 /* 3513 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 3514 * ourselves. 3515 */ 3516 static __be32 3517 nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr, 3518 struct svc_fh *fhp, struct svc_export *exp, 3519 struct dentry *dentry, const u32 *bmval, 3520 int ignore_crossmnt) 3521 { 3522 DECLARE_BITMAP(attr_bitmap, ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)); 3523 struct nfsd4_fattr_args args; 3524 struct svc_fh *tempfh = NULL; 3525 int starting_len = xdr->buf->len; 3526 __be32 *attrlen_p, status; 3527 int attrlen_offset; 3528 u32 attrmask[3]; 3529 int err; 3530 struct nfsd4_compoundres *resp = rqstp->rq_resp; 3531 u32 minorversion = resp->cstate.minorversion; 3532 struct path path = { 3533 .mnt = exp->ex_path.mnt, 3534 .dentry = dentry, 3535 }; 3536 unsigned long bit; 3537 bool file_modified = false; 3538 u64 size = 0; 3539 3540 WARN_ON_ONCE(bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1); 3541 WARN_ON_ONCE(!nfsd_attrs_supported(minorversion, bmval)); 3542 3543 args.rqstp = rqstp; 3544 args.exp = exp; 3545 args.dentry = dentry; 3546 args.ignore_crossmnt = (ignore_crossmnt != 0); 3547 args.acl = NULL; 3548 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3549 args.context = NULL; 3550 #endif 3551 3552 /* 3553 * Make a local copy of the attribute bitmap that can be modified. 3554 */ 3555 attrmask[0] = bmval[0]; 3556 attrmask[1] = bmval[1]; 3557 attrmask[2] = bmval[2]; 3558 3559 args.rdattr_err = 0; 3560 if (exp->ex_fslocs.migrated) { 3561 status = fattr_handle_absent_fs(&attrmask[0], &attrmask[1], 3562 &attrmask[2], &args.rdattr_err); 3563 if (status) 3564 goto out; 3565 } 3566 args.size = 0; 3567 if (attrmask[0] & (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE)) { 3568 status = nfsd4_deleg_getattr_conflict(rqstp, dentry, 3569 &file_modified, &size); 3570 if (status) 3571 goto out; 3572 } 3573 3574 err = vfs_getattr(&path, &args.stat, 3575 STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE, 3576 AT_STATX_SYNC_AS_STAT); 3577 if (err) 3578 goto out_nfserr; 3579 if (file_modified) 3580 args.size = size; 3581 else 3582 args.size = args.stat.size; 3583 3584 if (!(args.stat.result_mask & STATX_BTIME)) 3585 /* underlying FS does not offer btime so we can't share it */ 3586 attrmask[1] &= ~FATTR4_WORD1_TIME_CREATE; 3587 if ((attrmask[0] & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE | 3588 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || 3589 (attrmask[1] & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 3590 FATTR4_WORD1_SPACE_TOTAL))) { 3591 err = vfs_statfs(&path, &args.statfs); 3592 if (err) 3593 goto out_nfserr; 3594 } 3595 if ((attrmask[0] & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && 3596 !fhp) { 3597 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); 3598 status = nfserr_jukebox; 3599 if (!tempfh) 3600 goto out; 3601 fh_init(tempfh, NFS4_FHSIZE); 3602 status = fh_compose(tempfh, exp, dentry, NULL); 3603 if (status) 3604 goto out; 3605 args.fhp = tempfh; 3606 } else 3607 args.fhp = fhp; 3608 3609 if (attrmask[0] & FATTR4_WORD0_ACL) { 3610 err = nfsd4_get_nfs4_acl(rqstp, dentry, &args.acl); 3611 if (err == -EOPNOTSUPP) 3612 attrmask[0] &= ~FATTR4_WORD0_ACL; 3613 else if (err == -EINVAL) { 3614 status = nfserr_attrnotsupp; 3615 goto out; 3616 } else if (err != 0) 3617 goto out_nfserr; 3618 } 3619 3620 args.contextsupport = false; 3621 3622 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3623 if ((attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) || 3624 attrmask[0] & FATTR4_WORD0_SUPPORTED_ATTRS) { 3625 if (exp->ex_flags & NFSEXP_SECURITY_LABEL) 3626 err = security_inode_getsecctx(d_inode(dentry), 3627 &args.context, &args.contextlen); 3628 else 3629 err = -EOPNOTSUPP; 3630 args.contextsupport = (err == 0); 3631 if (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) { 3632 if (err == -EOPNOTSUPP) 3633 attrmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3634 else if (err) 3635 goto out_nfserr; 3636 } 3637 } 3638 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 3639 3640 /* attrmask */ 3641 status = nfsd4_encode_bitmap4(xdr, attrmask[0], attrmask[1], 3642 attrmask[2]); 3643 if (status) 3644 goto out; 3645 3646 /* attr_vals */ 3647 attrlen_offset = xdr->buf->len; 3648 attrlen_p = xdr_reserve_space(xdr, XDR_UNIT); 3649 if (!attrlen_p) 3650 goto out_resource; 3651 bitmap_from_arr32(attr_bitmap, attrmask, 3652 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)); 3653 for_each_set_bit(bit, attr_bitmap, 3654 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)) { 3655 status = nfsd4_enc_fattr4_encode_ops[bit](xdr, &args); 3656 if (status != nfs_ok) 3657 goto out; 3658 } 3659 *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT); 3660 status = nfs_ok; 3661 3662 out: 3663 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3664 if (args.context) 3665 security_release_secctx(args.context, args.contextlen); 3666 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 3667 kfree(args.acl); 3668 if (tempfh) { 3669 fh_put(tempfh); 3670 kfree(tempfh); 3671 } 3672 if (status) 3673 xdr_truncate_encode(xdr, starting_len); 3674 return status; 3675 out_nfserr: 3676 status = nfserrno(err); 3677 goto out; 3678 out_resource: 3679 status = nfserr_resource; 3680 goto out; 3681 } 3682 3683 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, 3684 struct xdr_buf *buf, __be32 *p, int bytes) 3685 { 3686 xdr->scratch.iov_len = 0; 3687 memset(buf, 0, sizeof(struct xdr_buf)); 3688 buf->head[0].iov_base = p; 3689 buf->head[0].iov_len = 0; 3690 buf->len = 0; 3691 xdr->buf = buf; 3692 xdr->iov = buf->head; 3693 xdr->p = p; 3694 xdr->end = (void *)p + bytes; 3695 buf->buflen = bytes; 3696 } 3697 3698 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, 3699 struct svc_fh *fhp, struct svc_export *exp, 3700 struct dentry *dentry, u32 *bmval, 3701 struct svc_rqst *rqstp, int ignore_crossmnt) 3702 { 3703 struct xdr_buf dummy; 3704 struct xdr_stream xdr; 3705 __be32 ret; 3706 3707 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); 3708 ret = nfsd4_encode_fattr4(rqstp, &xdr, fhp, exp, dentry, bmval, 3709 ignore_crossmnt); 3710 *p = xdr.p; 3711 return ret; 3712 } 3713 3714 /* 3715 * The buffer space for this field was reserved during a previous 3716 * call to nfsd4_encode_entry4(). 3717 */ 3718 static void nfsd4_encode_entry4_nfs_cookie4(const struct nfsd4_readdir *readdir, 3719 u64 offset) 3720 { 3721 __be64 cookie = cpu_to_be64(offset); 3722 struct xdr_stream *xdr = readdir->xdr; 3723 3724 if (!readdir->cookie_offset) 3725 return; 3726 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, &cookie, 3727 sizeof(cookie)); 3728 } 3729 3730 static inline int attributes_need_mount(u32 *bmval) 3731 { 3732 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) 3733 return 1; 3734 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) 3735 return 1; 3736 return 0; 3737 } 3738 3739 static __be32 3740 nfsd4_encode_entry4_fattr(struct nfsd4_readdir *cd, const char *name, 3741 int namlen) 3742 { 3743 struct svc_export *exp = cd->rd_fhp->fh_export; 3744 struct dentry *dentry; 3745 __be32 nfserr; 3746 int ignore_crossmnt = 0; 3747 3748 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen); 3749 if (IS_ERR(dentry)) 3750 return nfserrno(PTR_ERR(dentry)); 3751 3752 exp_get(exp); 3753 /* 3754 * In the case of a mountpoint, the client may be asking for 3755 * attributes that are only properties of the underlying filesystem 3756 * as opposed to the cross-mounted file system. In such a case, 3757 * we will not follow the cross mount and will fill the attribtutes 3758 * directly from the mountpoint dentry. 3759 */ 3760 if (nfsd_mountpoint(dentry, exp)) { 3761 int err; 3762 3763 if (!(exp->ex_flags & NFSEXP_V4ROOT) 3764 && !attributes_need_mount(cd->rd_bmval)) { 3765 ignore_crossmnt = 1; 3766 goto out_encode; 3767 } 3768 /* 3769 * Why the heck aren't we just using nfsd_lookup?? 3770 * Different "."/".." handling? Something else? 3771 * At least, add a comment here to explain.... 3772 */ 3773 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); 3774 if (err) { 3775 nfserr = nfserrno(err); 3776 goto out_put; 3777 } 3778 nfserr = check_nfsd_access(exp, cd->rd_rqstp); 3779 if (nfserr) 3780 goto out_put; 3781 3782 } 3783 out_encode: 3784 nfserr = nfsd4_encode_fattr4(cd->rd_rqstp, cd->xdr, NULL, exp, dentry, 3785 cd->rd_bmval, ignore_crossmnt); 3786 out_put: 3787 dput(dentry); 3788 exp_put(exp); 3789 return nfserr; 3790 } 3791 3792 static __be32 3793 nfsd4_encode_entry4_rdattr_error(struct xdr_stream *xdr, __be32 nfserr) 3794 { 3795 __be32 status; 3796 3797 /* attrmask */ 3798 status = nfsd4_encode_bitmap4(xdr, FATTR4_WORD0_RDATTR_ERROR, 0, 0); 3799 if (status != nfs_ok) 3800 return status; 3801 /* attr_vals */ 3802 if (xdr_stream_encode_u32(xdr, XDR_UNIT) != XDR_UNIT) 3803 return nfserr_resource; 3804 /* rdattr_error */ 3805 if (xdr_stream_encode_be32(xdr, nfserr) != XDR_UNIT) 3806 return nfserr_resource; 3807 return nfs_ok; 3808 } 3809 3810 static int 3811 nfsd4_encode_entry4(void *ccdv, const char *name, int namlen, 3812 loff_t offset, u64 ino, unsigned int d_type) 3813 { 3814 struct readdir_cd *ccd = ccdv; 3815 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 3816 struct xdr_stream *xdr = cd->xdr; 3817 int start_offset = xdr->buf->len; 3818 int cookie_offset; 3819 u32 name_and_cookie; 3820 int entry_bytes; 3821 __be32 nfserr = nfserr_toosmall; 3822 3823 /* In nfsv4, "." and ".." never make it onto the wire.. */ 3824 if (name && isdotent(name, namlen)) { 3825 cd->common.err = nfs_ok; 3826 return 0; 3827 } 3828 3829 /* Encode the previous entry's cookie value */ 3830 nfsd4_encode_entry4_nfs_cookie4(cd, offset); 3831 3832 if (xdr_stream_encode_item_present(xdr) != XDR_UNIT) 3833 goto fail; 3834 3835 /* Reserve send buffer space for this entry's cookie value. */ 3836 cookie_offset = xdr->buf->len; 3837 if (nfsd4_encode_nfs_cookie4(xdr, OFFSET_MAX) != nfs_ok) 3838 goto fail; 3839 if (nfsd4_encode_component4(xdr, name, namlen) != nfs_ok) 3840 goto fail; 3841 nfserr = nfsd4_encode_entry4_fattr(cd, name, namlen); 3842 switch (nfserr) { 3843 case nfs_ok: 3844 break; 3845 case nfserr_resource: 3846 nfserr = nfserr_toosmall; 3847 goto fail; 3848 case nfserr_noent: 3849 xdr_truncate_encode(xdr, start_offset); 3850 goto skip_entry; 3851 case nfserr_jukebox: 3852 /* 3853 * The pseudoroot should only display dentries that lead to 3854 * exports. If we get EJUKEBOX here, then we can't tell whether 3855 * this entry should be included. Just fail the whole READDIR 3856 * with NFS4ERR_DELAY in that case, and hope that the situation 3857 * will resolve itself by the client's next attempt. 3858 */ 3859 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT) 3860 goto fail; 3861 fallthrough; 3862 default: 3863 /* 3864 * If the client requested the RDATTR_ERROR attribute, 3865 * we stuff the error code into this attribute 3866 * and continue. If this attribute was not requested, 3867 * then in accordance with the spec, we fail the 3868 * entire READDIR operation(!) 3869 */ 3870 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 3871 goto fail; 3872 if (nfsd4_encode_entry4_rdattr_error(xdr, nfserr)) { 3873 nfserr = nfserr_toosmall; 3874 goto fail; 3875 } 3876 } 3877 nfserr = nfserr_toosmall; 3878 entry_bytes = xdr->buf->len - start_offset; 3879 if (entry_bytes > cd->rd_maxcount) 3880 goto fail; 3881 cd->rd_maxcount -= entry_bytes; 3882 /* 3883 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and 3884 * notes that it could be zero. If it is zero, then the server 3885 * should enforce only the rd_maxcount value. 3886 */ 3887 if (cd->rd_dircount) { 3888 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8; 3889 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset) 3890 goto fail; 3891 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie); 3892 if (!cd->rd_dircount) 3893 cd->rd_maxcount = 0; 3894 } 3895 3896 cd->cookie_offset = cookie_offset; 3897 skip_entry: 3898 cd->common.err = nfs_ok; 3899 return 0; 3900 fail: 3901 xdr_truncate_encode(xdr, start_offset); 3902 cd->common.err = nfserr; 3903 return -EINVAL; 3904 } 3905 3906 static __be32 3907 nfsd4_encode_verifier4(struct xdr_stream *xdr, const nfs4_verifier *verf) 3908 { 3909 __be32 *p; 3910 3911 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3912 if (!p) 3913 return nfserr_resource; 3914 memcpy(p, verf->data, sizeof(verf->data)); 3915 return nfs_ok; 3916 } 3917 3918 static __be32 3919 nfsd4_encode_clientid4(struct xdr_stream *xdr, const clientid_t *clientid) 3920 { 3921 __be32 *p; 3922 3923 p = xdr_reserve_space(xdr, sizeof(__be64)); 3924 if (!p) 3925 return nfserr_resource; 3926 memcpy(p, clientid, sizeof(*clientid)); 3927 return nfs_ok; 3928 } 3929 3930 /* This is a frequently-encoded item; open-coded for speed */ 3931 static __be32 3932 nfsd4_encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) 3933 { 3934 __be32 *p; 3935 3936 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); 3937 if (!p) 3938 return nfserr_resource; 3939 *p++ = cpu_to_be32(sid->si_generation); 3940 memcpy(p, &sid->si_opaque, sizeof(sid->si_opaque)); 3941 return nfs_ok; 3942 } 3943 3944 static __be32 3945 nfsd4_encode_sessionid4(struct xdr_stream *xdr, 3946 const struct nfs4_sessionid *sessionid) 3947 { 3948 return nfsd4_encode_opaque_fixed(xdr, sessionid->data, 3949 NFS4_MAX_SESSIONID_LEN); 3950 } 3951 3952 static __be32 3953 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, 3954 union nfsd4_op_u *u) 3955 { 3956 struct nfsd4_access *access = &u->access; 3957 struct xdr_stream *xdr = resp->xdr; 3958 __be32 status; 3959 3960 /* supported */ 3961 status = nfsd4_encode_uint32_t(xdr, access->ac_supported); 3962 if (status != nfs_ok) 3963 return status; 3964 /* access */ 3965 return nfsd4_encode_uint32_t(xdr, access->ac_resp_access); 3966 } 3967 3968 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, 3969 union nfsd4_op_u *u) 3970 { 3971 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session; 3972 struct xdr_stream *xdr = resp->xdr; 3973 3974 /* bctsr_sessid */ 3975 nfserr = nfsd4_encode_sessionid4(xdr, &bcts->sessionid); 3976 if (nfserr != nfs_ok) 3977 return nfserr; 3978 /* bctsr_dir */ 3979 if (xdr_stream_encode_u32(xdr, bcts->dir) != XDR_UNIT) 3980 return nfserr_resource; 3981 /* bctsr_use_conn_in_rdma_mode */ 3982 return nfsd4_encode_bool(xdr, false); 3983 } 3984 3985 static __be32 3986 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, 3987 union nfsd4_op_u *u) 3988 { 3989 struct nfsd4_close *close = &u->close; 3990 struct xdr_stream *xdr = resp->xdr; 3991 3992 /* open_stateid */ 3993 return nfsd4_encode_stateid4(xdr, &close->cl_stateid); 3994 } 3995 3996 3997 static __be32 3998 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, 3999 union nfsd4_op_u *u) 4000 { 4001 struct nfsd4_commit *commit = &u->commit; 4002 4003 return nfsd4_encode_verifier4(resp->xdr, &commit->co_verf); 4004 } 4005 4006 static __be32 4007 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, 4008 union nfsd4_op_u *u) 4009 { 4010 struct nfsd4_create *create = &u->create; 4011 struct xdr_stream *xdr = resp->xdr; 4012 4013 /* cinfo */ 4014 nfserr = nfsd4_encode_change_info4(xdr, &create->cr_cinfo); 4015 if (nfserr) 4016 return nfserr; 4017 /* attrset */ 4018 return nfsd4_encode_bitmap4(xdr, create->cr_bmval[0], 4019 create->cr_bmval[1], create->cr_bmval[2]); 4020 } 4021 4022 static __be32 4023 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, 4024 union nfsd4_op_u *u) 4025 { 4026 struct nfsd4_getattr *getattr = &u->getattr; 4027 struct svc_fh *fhp = getattr->ga_fhp; 4028 struct xdr_stream *xdr = resp->xdr; 4029 4030 /* obj_attributes */ 4031 return nfsd4_encode_fattr4(resp->rqstp, xdr, fhp, fhp->fh_export, 4032 fhp->fh_dentry, getattr->ga_bmval, 0); 4033 } 4034 4035 static __be32 4036 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, 4037 union nfsd4_op_u *u) 4038 { 4039 struct xdr_stream *xdr = resp->xdr; 4040 struct svc_fh *fhp = u->getfh; 4041 4042 /* object */ 4043 return nfsd4_encode_nfs_fh4(xdr, &fhp->fh_handle); 4044 } 4045 4046 static __be32 4047 nfsd4_encode_lock_owner4(struct xdr_stream *xdr, const clientid_t *clientid, 4048 const struct xdr_netobj *owner) 4049 { 4050 __be32 status; 4051 4052 /* clientid */ 4053 status = nfsd4_encode_clientid4(xdr, clientid); 4054 if (status != nfs_ok) 4055 return status; 4056 /* owner */ 4057 return nfsd4_encode_opaque(xdr, owner->data, owner->len); 4058 } 4059 4060 static __be32 4061 nfsd4_encode_lock4denied(struct xdr_stream *xdr, 4062 const struct nfsd4_lock_denied *ld) 4063 { 4064 __be32 status; 4065 4066 /* offset */ 4067 status = nfsd4_encode_offset4(xdr, ld->ld_start); 4068 if (status != nfs_ok) 4069 return status; 4070 /* length */ 4071 status = nfsd4_encode_length4(xdr, ld->ld_length); 4072 if (status != nfs_ok) 4073 return status; 4074 /* locktype */ 4075 if (xdr_stream_encode_u32(xdr, ld->ld_type) != XDR_UNIT) 4076 return nfserr_resource; 4077 /* owner */ 4078 return nfsd4_encode_lock_owner4(xdr, &ld->ld_clientid, 4079 &ld->ld_owner); 4080 } 4081 4082 static __be32 4083 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, 4084 union nfsd4_op_u *u) 4085 { 4086 struct nfsd4_lock *lock = &u->lock; 4087 struct xdr_stream *xdr = resp->xdr; 4088 __be32 status; 4089 4090 switch (nfserr) { 4091 case nfs_ok: 4092 /* resok4 */ 4093 status = nfsd4_encode_stateid4(xdr, &lock->lk_resp_stateid); 4094 break; 4095 case nfserr_denied: 4096 /* denied */ 4097 status = nfsd4_encode_lock4denied(xdr, &lock->lk_denied); 4098 break; 4099 default: 4100 return nfserr; 4101 } 4102 return status != nfs_ok ? status : nfserr; 4103 } 4104 4105 static __be32 4106 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, 4107 union nfsd4_op_u *u) 4108 { 4109 struct nfsd4_lockt *lockt = &u->lockt; 4110 struct xdr_stream *xdr = resp->xdr; 4111 __be32 status; 4112 4113 if (nfserr == nfserr_denied) { 4114 /* denied */ 4115 status = nfsd4_encode_lock4denied(xdr, &lockt->lt_denied); 4116 if (status != nfs_ok) 4117 return status; 4118 } 4119 return nfserr; 4120 } 4121 4122 static __be32 4123 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, 4124 union nfsd4_op_u *u) 4125 { 4126 struct nfsd4_locku *locku = &u->locku; 4127 struct xdr_stream *xdr = resp->xdr; 4128 4129 /* lock_stateid */ 4130 return nfsd4_encode_stateid4(xdr, &locku->lu_stateid); 4131 } 4132 4133 4134 static __be32 4135 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, 4136 union nfsd4_op_u *u) 4137 { 4138 struct nfsd4_link *link = &u->link; 4139 struct xdr_stream *xdr = resp->xdr; 4140 4141 return nfsd4_encode_change_info4(xdr, &link->li_cinfo); 4142 } 4143 4144 /* 4145 * This implementation does not yet support returning an ACE in an 4146 * OPEN that offers a delegation. 4147 */ 4148 static __be32 4149 nfsd4_encode_open_nfsace4(struct xdr_stream *xdr) 4150 { 4151 __be32 status; 4152 4153 /* type */ 4154 status = nfsd4_encode_acetype4(xdr, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 4155 if (status != nfs_ok) 4156 return nfserr_resource; 4157 /* flag */ 4158 status = nfsd4_encode_aceflag4(xdr, 0); 4159 if (status != nfs_ok) 4160 return nfserr_resource; 4161 /* access mask */ 4162 status = nfsd4_encode_acemask4(xdr, 0); 4163 if (status != nfs_ok) 4164 return nfserr_resource; 4165 /* who - empty for now */ 4166 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT) 4167 return nfserr_resource; 4168 return nfs_ok; 4169 } 4170 4171 static __be32 4172 nfsd4_encode_open_read_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open) 4173 { 4174 __be32 status; 4175 4176 /* stateid */ 4177 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid); 4178 if (status != nfs_ok) 4179 return status; 4180 /* recall */ 4181 status = nfsd4_encode_bool(xdr, open->op_recall); 4182 if (status != nfs_ok) 4183 return status; 4184 /* permissions */ 4185 return nfsd4_encode_open_nfsace4(xdr); 4186 } 4187 4188 static __be32 4189 nfsd4_encode_nfs_space_limit4(struct xdr_stream *xdr, u64 filesize) 4190 { 4191 /* limitby */ 4192 if (xdr_stream_encode_u32(xdr, NFS4_LIMIT_SIZE) != XDR_UNIT) 4193 return nfserr_resource; 4194 /* filesize */ 4195 return nfsd4_encode_uint64_t(xdr, filesize); 4196 } 4197 4198 static __be32 4199 nfsd4_encode_open_write_delegation4(struct xdr_stream *xdr, 4200 struct nfsd4_open *open) 4201 { 4202 __be32 status; 4203 4204 /* stateid */ 4205 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid); 4206 if (status != nfs_ok) 4207 return status; 4208 /* recall */ 4209 status = nfsd4_encode_bool(xdr, open->op_recall); 4210 if (status != nfs_ok) 4211 return status; 4212 /* space_limit */ 4213 status = nfsd4_encode_nfs_space_limit4(xdr, 0); 4214 if (status != nfs_ok) 4215 return status; 4216 return nfsd4_encode_open_nfsace4(xdr); 4217 } 4218 4219 static __be32 4220 nfsd4_encode_open_none_delegation4(struct xdr_stream *xdr, 4221 struct nfsd4_open *open) 4222 { 4223 __be32 status = nfs_ok; 4224 4225 /* ond_why */ 4226 if (xdr_stream_encode_u32(xdr, open->op_why_no_deleg) != XDR_UNIT) 4227 return nfserr_resource; 4228 switch (open->op_why_no_deleg) { 4229 case WND4_CONTENTION: 4230 /* ond_server_will_push_deleg */ 4231 status = nfsd4_encode_bool(xdr, false); 4232 break; 4233 case WND4_RESOURCE: 4234 /* ond_server_will_signal_avail */ 4235 status = nfsd4_encode_bool(xdr, false); 4236 } 4237 return status; 4238 } 4239 4240 static __be32 4241 nfsd4_encode_open_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open) 4242 { 4243 __be32 status; 4244 4245 /* delegation_type */ 4246 if (xdr_stream_encode_u32(xdr, open->op_delegate_type) != XDR_UNIT) 4247 return nfserr_resource; 4248 switch (open->op_delegate_type) { 4249 case NFS4_OPEN_DELEGATE_NONE: 4250 status = nfs_ok; 4251 break; 4252 case NFS4_OPEN_DELEGATE_READ: 4253 /* read */ 4254 status = nfsd4_encode_open_read_delegation4(xdr, open); 4255 break; 4256 case NFS4_OPEN_DELEGATE_WRITE: 4257 /* write */ 4258 status = nfsd4_encode_open_write_delegation4(xdr, open); 4259 break; 4260 case NFS4_OPEN_DELEGATE_NONE_EXT: 4261 /* od_whynone */ 4262 status = nfsd4_encode_open_none_delegation4(xdr, open); 4263 break; 4264 default: 4265 status = nfserr_serverfault; 4266 } 4267 4268 return status; 4269 } 4270 4271 static __be32 4272 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, 4273 union nfsd4_op_u *u) 4274 { 4275 struct nfsd4_open *open = &u->open; 4276 struct xdr_stream *xdr = resp->xdr; 4277 4278 /* stateid */ 4279 nfserr = nfsd4_encode_stateid4(xdr, &open->op_stateid); 4280 if (nfserr != nfs_ok) 4281 return nfserr; 4282 /* cinfo */ 4283 nfserr = nfsd4_encode_change_info4(xdr, &open->op_cinfo); 4284 if (nfserr != nfs_ok) 4285 return nfserr; 4286 /* rflags */ 4287 nfserr = nfsd4_encode_uint32_t(xdr, open->op_rflags); 4288 if (nfserr != nfs_ok) 4289 return nfserr; 4290 /* attrset */ 4291 nfserr = nfsd4_encode_bitmap4(xdr, open->op_bmval[0], 4292 open->op_bmval[1], open->op_bmval[2]); 4293 if (nfserr != nfs_ok) 4294 return nfserr; 4295 /* delegation */ 4296 return nfsd4_encode_open_delegation4(xdr, open); 4297 } 4298 4299 static __be32 4300 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, 4301 union nfsd4_op_u *u) 4302 { 4303 struct nfsd4_open_confirm *oc = &u->open_confirm; 4304 struct xdr_stream *xdr = resp->xdr; 4305 4306 /* open_stateid */ 4307 return nfsd4_encode_stateid4(xdr, &oc->oc_resp_stateid); 4308 } 4309 4310 static __be32 4311 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, 4312 union nfsd4_op_u *u) 4313 { 4314 struct nfsd4_open_downgrade *od = &u->open_downgrade; 4315 struct xdr_stream *xdr = resp->xdr; 4316 4317 /* open_stateid */ 4318 return nfsd4_encode_stateid4(xdr, &od->od_stateid); 4319 } 4320 4321 /* 4322 * The operation of this function assumes that this is the only 4323 * READ operation in the COMPOUND. If there are multiple READs, 4324 * we use nfsd4_encode_readv(). 4325 */ 4326 static __be32 nfsd4_encode_splice_read( 4327 struct nfsd4_compoundres *resp, 4328 struct nfsd4_read *read, 4329 struct file *file, unsigned long maxcount) 4330 { 4331 struct xdr_stream *xdr = resp->xdr; 4332 struct xdr_buf *buf = xdr->buf; 4333 int status, space_left; 4334 __be32 nfserr; 4335 4336 /* 4337 * Make sure there is room at the end of buf->head for 4338 * svcxdr_encode_opaque_pages() to create a tail buffer 4339 * to XDR-pad the payload. 4340 */ 4341 if (xdr->iov != xdr->buf->head || xdr->end - xdr->p < 1) 4342 return nfserr_resource; 4343 4344 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp, 4345 file, read->rd_offset, &maxcount, 4346 &read->rd_eof); 4347 read->rd_length = maxcount; 4348 if (nfserr) 4349 goto out_err; 4350 svcxdr_encode_opaque_pages(read->rd_rqstp, xdr, buf->pages, 4351 buf->page_base, maxcount); 4352 status = svc_encode_result_payload(read->rd_rqstp, 4353 buf->head[0].iov_len, maxcount); 4354 if (status) { 4355 nfserr = nfserrno(status); 4356 goto out_err; 4357 } 4358 4359 /* 4360 * Prepare to encode subsequent operations. 4361 * 4362 * xdr_truncate_encode() is not safe to use after a successful 4363 * splice read has been done, so the following stream 4364 * manipulations are open-coded. 4365 */ 4366 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p, 4367 buf->buflen - buf->len); 4368 buf->buflen = buf->len + space_left; 4369 xdr->end = (__be32 *)((void *)xdr->end + space_left); 4370 4371 return nfs_ok; 4372 4373 out_err: 4374 /* 4375 * nfsd_splice_actor may have already messed with the 4376 * page length; reset it so as not to confuse 4377 * xdr_truncate_encode in our caller. 4378 */ 4379 buf->page_len = 0; 4380 return nfserr; 4381 } 4382 4383 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, 4384 struct nfsd4_read *read, 4385 struct file *file, unsigned long maxcount) 4386 { 4387 struct xdr_stream *xdr = resp->xdr; 4388 unsigned int base = xdr->buf->page_len & ~PAGE_MASK; 4389 unsigned int starting_len = xdr->buf->len; 4390 __be32 zero = xdr_zero; 4391 __be32 nfserr; 4392 4393 if (xdr_reserve_space_vec(xdr, maxcount) < 0) 4394 return nfserr_resource; 4395 4396 nfserr = nfsd_iter_read(resp->rqstp, read->rd_fhp, file, 4397 read->rd_offset, &maxcount, base, 4398 &read->rd_eof); 4399 read->rd_length = maxcount; 4400 if (nfserr) 4401 return nfserr; 4402 if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount)) 4403 return nfserr_io; 4404 xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount)); 4405 4406 write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero, 4407 xdr_pad_size(maxcount)); 4408 return nfs_ok; 4409 } 4410 4411 static __be32 4412 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 4413 union nfsd4_op_u *u) 4414 { 4415 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp; 4416 struct nfsd4_read *read = &u->read; 4417 struct xdr_stream *xdr = resp->xdr; 4418 int starting_len = xdr->buf->len; 4419 bool splice_ok = argp->splice_ok; 4420 unsigned long maxcount; 4421 struct file *file; 4422 __be32 *p; 4423 4424 if (nfserr) 4425 return nfserr; 4426 file = read->rd_nf->nf_file; 4427 4428 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ 4429 if (!p) { 4430 WARN_ON_ONCE(splice_ok); 4431 return nfserr_resource; 4432 } 4433 if (resp->xdr->buf->page_len && splice_ok) { 4434 WARN_ON_ONCE(1); 4435 return nfserr_serverfault; 4436 } 4437 xdr_commit_encode(xdr); 4438 4439 maxcount = min_t(unsigned long, read->rd_length, 4440 (xdr->buf->buflen - xdr->buf->len)); 4441 4442 if (file->f_op->splice_read && splice_ok) 4443 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 4444 else 4445 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 4446 if (nfserr) { 4447 xdr_truncate_encode(xdr, starting_len); 4448 return nfserr; 4449 } 4450 4451 p = xdr_encode_bool(p, read->rd_eof); 4452 *p = cpu_to_be32(read->rd_length); 4453 return nfs_ok; 4454 } 4455 4456 static __be32 4457 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, 4458 union nfsd4_op_u *u) 4459 { 4460 struct nfsd4_readlink *readlink = &u->readlink; 4461 __be32 *p, *maxcount_p, zero = xdr_zero; 4462 struct xdr_stream *xdr = resp->xdr; 4463 int length_offset = xdr->buf->len; 4464 int maxcount, status; 4465 4466 maxcount_p = xdr_reserve_space(xdr, XDR_UNIT); 4467 if (!maxcount_p) 4468 return nfserr_resource; 4469 maxcount = PAGE_SIZE; 4470 4471 p = xdr_reserve_space(xdr, maxcount); 4472 if (!p) 4473 return nfserr_resource; 4474 /* 4475 * XXX: By default, vfs_readlink() will truncate symlinks if they 4476 * would overflow the buffer. Is this kosher in NFSv4? If not, one 4477 * easy fix is: if vfs_readlink() precisely fills the buffer, assume 4478 * that truncation occurred, and return NFS4ERR_RESOURCE. 4479 */ 4480 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, 4481 (char *)p, &maxcount); 4482 if (nfserr == nfserr_isdir) 4483 nfserr = nfserr_inval; 4484 if (nfserr) 4485 goto out_err; 4486 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset, 4487 maxcount); 4488 if (status) { 4489 nfserr = nfserrno(status); 4490 goto out_err; 4491 } 4492 *maxcount_p = cpu_to_be32(maxcount); 4493 xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount)); 4494 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero, 4495 xdr_pad_size(maxcount)); 4496 return nfs_ok; 4497 4498 out_err: 4499 xdr_truncate_encode(xdr, length_offset); 4500 return nfserr; 4501 } 4502 4503 static __be32 nfsd4_encode_dirlist4(struct xdr_stream *xdr, 4504 struct nfsd4_readdir *readdir, 4505 u32 max_payload) 4506 { 4507 int bytes_left, maxcount, starting_len = xdr->buf->len; 4508 loff_t offset; 4509 __be32 status; 4510 4511 /* 4512 * Number of bytes left for directory entries allowing for the 4513 * final 8 bytes of the readdir and a following failed op. 4514 */ 4515 bytes_left = xdr->buf->buflen - xdr->buf->len - 4516 COMPOUND_ERR_SLACK_SPACE - XDR_UNIT * 2; 4517 if (bytes_left < 0) 4518 return nfserr_resource; 4519 maxcount = min_t(u32, readdir->rd_maxcount, max_payload); 4520 4521 /* 4522 * The RFC defines rd_maxcount as the size of the 4523 * READDIR4resok structure, which includes the verifier 4524 * and the 8 bytes encoded at the end of this function. 4525 */ 4526 if (maxcount < XDR_UNIT * 4) 4527 return nfserr_toosmall; 4528 maxcount = min_t(int, maxcount - XDR_UNIT * 4, bytes_left); 4529 4530 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0 */ 4531 if (!readdir->rd_dircount) 4532 readdir->rd_dircount = max_payload; 4533 4534 /* *entries */ 4535 readdir->xdr = xdr; 4536 readdir->rd_maxcount = maxcount; 4537 readdir->common.err = 0; 4538 readdir->cookie_offset = 0; 4539 offset = readdir->rd_cookie; 4540 status = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, &offset, 4541 &readdir->common, nfsd4_encode_entry4); 4542 if (status) 4543 return status; 4544 if (readdir->common.err == nfserr_toosmall && 4545 xdr->buf->len == starting_len) { 4546 /* No entries were encoded. Which limit did we hit? */ 4547 if (maxcount - XDR_UNIT * 4 < bytes_left) 4548 /* It was the fault of rd_maxcount */ 4549 return nfserr_toosmall; 4550 /* We ran out of buffer space */ 4551 return nfserr_resource; 4552 } 4553 /* Encode the final entry's cookie value */ 4554 nfsd4_encode_entry4_nfs_cookie4(readdir, offset); 4555 /* No entries follow */ 4556 if (xdr_stream_encode_item_absent(xdr) != XDR_UNIT) 4557 return nfserr_resource; 4558 4559 /* eof */ 4560 return nfsd4_encode_bool(xdr, readdir->common.err == nfserr_eof); 4561 } 4562 4563 static __be32 4564 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, 4565 union nfsd4_op_u *u) 4566 { 4567 struct nfsd4_readdir *readdir = &u->readdir; 4568 struct xdr_stream *xdr = resp->xdr; 4569 int starting_len = xdr->buf->len; 4570 4571 /* cookieverf */ 4572 nfserr = nfsd4_encode_verifier4(xdr, &readdir->rd_verf); 4573 if (nfserr != nfs_ok) 4574 return nfserr; 4575 4576 /* reply */ 4577 nfserr = nfsd4_encode_dirlist4(xdr, readdir, svc_max_payload(resp->rqstp)); 4578 if (nfserr != nfs_ok) 4579 xdr_truncate_encode(xdr, starting_len); 4580 return nfserr; 4581 } 4582 4583 static __be32 4584 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, 4585 union nfsd4_op_u *u) 4586 { 4587 struct nfsd4_remove *remove = &u->remove; 4588 struct xdr_stream *xdr = resp->xdr; 4589 4590 return nfsd4_encode_change_info4(xdr, &remove->rm_cinfo); 4591 } 4592 4593 static __be32 4594 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, 4595 union nfsd4_op_u *u) 4596 { 4597 struct nfsd4_rename *rename = &u->rename; 4598 struct xdr_stream *xdr = resp->xdr; 4599 4600 nfserr = nfsd4_encode_change_info4(xdr, &rename->rn_sinfo); 4601 if (nfserr) 4602 return nfserr; 4603 return nfsd4_encode_change_info4(xdr, &rename->rn_tinfo); 4604 } 4605 4606 static __be32 4607 nfsd4_encode_rpcsec_gss_info(struct xdr_stream *xdr, 4608 struct rpcsec_gss_info *info) 4609 { 4610 __be32 status; 4611 4612 /* oid */ 4613 if (xdr_stream_encode_opaque(xdr, info->oid.data, info->oid.len) < 0) 4614 return nfserr_resource; 4615 /* qop */ 4616 status = nfsd4_encode_qop4(xdr, info->qop); 4617 if (status != nfs_ok) 4618 return status; 4619 /* service */ 4620 if (xdr_stream_encode_u32(xdr, info->service) != XDR_UNIT) 4621 return nfserr_resource; 4622 4623 return nfs_ok; 4624 } 4625 4626 static __be32 4627 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp) 4628 { 4629 u32 i, nflavs, supported; 4630 struct exp_flavor_info *flavs; 4631 struct exp_flavor_info def_flavs[2]; 4632 static bool report = true; 4633 __be32 *flavorsp; 4634 __be32 status; 4635 4636 if (exp->ex_nflavors) { 4637 flavs = exp->ex_flavors; 4638 nflavs = exp->ex_nflavors; 4639 } else { /* Handling of some defaults in absence of real secinfo: */ 4640 flavs = def_flavs; 4641 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { 4642 nflavs = 2; 4643 flavs[0].pseudoflavor = RPC_AUTH_UNIX; 4644 flavs[1].pseudoflavor = RPC_AUTH_NULL; 4645 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { 4646 nflavs = 1; 4647 flavs[0].pseudoflavor 4648 = svcauth_gss_flavor(exp->ex_client); 4649 } else { 4650 nflavs = 1; 4651 flavs[0].pseudoflavor 4652 = exp->ex_client->flavour->flavour; 4653 } 4654 } 4655 4656 supported = 0; 4657 flavorsp = xdr_reserve_space(xdr, XDR_UNIT); 4658 if (!flavorsp) 4659 return nfserr_resource; 4660 4661 for (i = 0; i < nflavs; i++) { 4662 rpc_authflavor_t pf = flavs[i].pseudoflavor; 4663 struct rpcsec_gss_info info; 4664 4665 if (rpcauth_get_gssinfo(pf, &info) == 0) { 4666 supported++; 4667 4668 /* flavor */ 4669 status = nfsd4_encode_uint32_t(xdr, RPC_AUTH_GSS); 4670 if (status != nfs_ok) 4671 return status; 4672 /* flavor_info */ 4673 status = nfsd4_encode_rpcsec_gss_info(xdr, &info); 4674 if (status != nfs_ok) 4675 return status; 4676 } else if (pf < RPC_AUTH_MAXFLAVOR) { 4677 supported++; 4678 4679 /* flavor */ 4680 status = nfsd4_encode_uint32_t(xdr, pf); 4681 if (status != nfs_ok) 4682 return status; 4683 } else { 4684 if (report) 4685 pr_warn("NFS: SECINFO: security flavor %u " 4686 "is not supported\n", pf); 4687 } 4688 } 4689 4690 if (nflavs != supported) 4691 report = false; 4692 *flavorsp = cpu_to_be32(supported); 4693 return 0; 4694 } 4695 4696 static __be32 4697 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4698 union nfsd4_op_u *u) 4699 { 4700 struct nfsd4_secinfo *secinfo = &u->secinfo; 4701 struct xdr_stream *xdr = resp->xdr; 4702 4703 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp); 4704 } 4705 4706 static __be32 4707 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, 4708 union nfsd4_op_u *u) 4709 { 4710 struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name; 4711 struct xdr_stream *xdr = resp->xdr; 4712 4713 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp); 4714 } 4715 4716 static __be32 4717 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, 4718 union nfsd4_op_u *u) 4719 { 4720 struct nfsd4_setattr *setattr = &u->setattr; 4721 __be32 status; 4722 4723 switch (nfserr) { 4724 case nfs_ok: 4725 /* attrsset */ 4726 status = nfsd4_encode_bitmap4(resp->xdr, setattr->sa_bmval[0], 4727 setattr->sa_bmval[1], 4728 setattr->sa_bmval[2]); 4729 break; 4730 default: 4731 /* attrsset */ 4732 status = nfsd4_encode_bitmap4(resp->xdr, 0, 0, 0); 4733 } 4734 return status != nfs_ok ? status : nfserr; 4735 } 4736 4737 static __be32 4738 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, 4739 union nfsd4_op_u *u) 4740 { 4741 struct nfsd4_setclientid *scd = &u->setclientid; 4742 struct xdr_stream *xdr = resp->xdr; 4743 4744 if (!nfserr) { 4745 nfserr = nfsd4_encode_clientid4(xdr, &scd->se_clientid); 4746 if (nfserr != nfs_ok) 4747 goto out; 4748 nfserr = nfsd4_encode_verifier4(xdr, &scd->se_confirm); 4749 } else if (nfserr == nfserr_clid_inuse) { 4750 /* empty network id */ 4751 if (xdr_stream_encode_u32(xdr, 0) < 0) { 4752 nfserr = nfserr_resource; 4753 goto out; 4754 } 4755 /* empty universal address */ 4756 if (xdr_stream_encode_u32(xdr, 0) < 0) { 4757 nfserr = nfserr_resource; 4758 goto out; 4759 } 4760 } 4761 out: 4762 return nfserr; 4763 } 4764 4765 static __be32 4766 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, 4767 union nfsd4_op_u *u) 4768 { 4769 struct nfsd4_write *write = &u->write; 4770 struct xdr_stream *xdr = resp->xdr; 4771 4772 /* count */ 4773 nfserr = nfsd4_encode_count4(xdr, write->wr_bytes_written); 4774 if (nfserr) 4775 return nfserr; 4776 /* committed */ 4777 if (xdr_stream_encode_u32(xdr, write->wr_how_written) != XDR_UNIT) 4778 return nfserr_resource; 4779 /* writeverf */ 4780 return nfsd4_encode_verifier4(xdr, &write->wr_verifier); 4781 } 4782 4783 static __be32 4784 nfsd4_encode_state_protect_ops4(struct xdr_stream *xdr, 4785 struct nfsd4_exchange_id *exid) 4786 { 4787 __be32 status; 4788 4789 /* spo_must_enforce */ 4790 status = nfsd4_encode_bitmap4(xdr, exid->spo_must_enforce[0], 4791 exid->spo_must_enforce[1], 4792 exid->spo_must_enforce[2]); 4793 if (status != nfs_ok) 4794 return status; 4795 /* spo_must_allow */ 4796 return nfsd4_encode_bitmap4(xdr, exid->spo_must_allow[0], 4797 exid->spo_must_allow[1], 4798 exid->spo_must_allow[2]); 4799 } 4800 4801 static __be32 4802 nfsd4_encode_state_protect4_r(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid) 4803 { 4804 __be32 status; 4805 4806 if (xdr_stream_encode_u32(xdr, exid->spa_how) != XDR_UNIT) 4807 return nfserr_resource; 4808 switch (exid->spa_how) { 4809 case SP4_NONE: 4810 status = nfs_ok; 4811 break; 4812 case SP4_MACH_CRED: 4813 /* spr_mach_ops */ 4814 status = nfsd4_encode_state_protect_ops4(xdr, exid); 4815 break; 4816 default: 4817 status = nfserr_serverfault; 4818 } 4819 return status; 4820 } 4821 4822 static __be32 4823 nfsd4_encode_server_owner4(struct xdr_stream *xdr, struct svc_rqst *rqstp) 4824 { 4825 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 4826 __be32 status; 4827 4828 /* so_minor_id */ 4829 status = nfsd4_encode_uint64_t(xdr, 0); 4830 if (status != nfs_ok) 4831 return status; 4832 /* so_major_id */ 4833 return nfsd4_encode_opaque(xdr, nn->nfsd_name, strlen(nn->nfsd_name)); 4834 } 4835 4836 static __be32 4837 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, 4838 union nfsd4_op_u *u) 4839 { 4840 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id); 4841 struct nfsd4_exchange_id *exid = &u->exchange_id; 4842 struct xdr_stream *xdr = resp->xdr; 4843 4844 /* eir_clientid */ 4845 nfserr = nfsd4_encode_clientid4(xdr, &exid->clientid); 4846 if (nfserr != nfs_ok) 4847 return nfserr; 4848 /* eir_sequenceid */ 4849 nfserr = nfsd4_encode_sequenceid4(xdr, exid->seqid); 4850 if (nfserr != nfs_ok) 4851 return nfserr; 4852 /* eir_flags */ 4853 nfserr = nfsd4_encode_uint32_t(xdr, exid->flags); 4854 if (nfserr != nfs_ok) 4855 return nfserr; 4856 /* eir_state_protect */ 4857 nfserr = nfsd4_encode_state_protect4_r(xdr, exid); 4858 if (nfserr != nfs_ok) 4859 return nfserr; 4860 /* eir_server_owner */ 4861 nfserr = nfsd4_encode_server_owner4(xdr, resp->rqstp); 4862 if (nfserr != nfs_ok) 4863 return nfserr; 4864 /* eir_server_scope */ 4865 nfserr = nfsd4_encode_opaque(xdr, nn->nfsd_name, 4866 strlen(nn->nfsd_name)); 4867 if (nfserr != nfs_ok) 4868 return nfserr; 4869 /* eir_server_impl_id<1> */ 4870 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT) 4871 return nfserr_resource; 4872 4873 return nfs_ok; 4874 } 4875 4876 static __be32 4877 nfsd4_encode_channel_attrs4(struct xdr_stream *xdr, 4878 const struct nfsd4_channel_attrs *attrs) 4879 { 4880 __be32 status; 4881 4882 /* ca_headerpadsize */ 4883 status = nfsd4_encode_count4(xdr, 0); 4884 if (status != nfs_ok) 4885 return status; 4886 /* ca_maxrequestsize */ 4887 status = nfsd4_encode_count4(xdr, attrs->maxreq_sz); 4888 if (status != nfs_ok) 4889 return status; 4890 /* ca_maxresponsesize */ 4891 status = nfsd4_encode_count4(xdr, attrs->maxresp_sz); 4892 if (status != nfs_ok) 4893 return status; 4894 /* ca_maxresponsesize_cached */ 4895 status = nfsd4_encode_count4(xdr, attrs->maxresp_cached); 4896 if (status != nfs_ok) 4897 return status; 4898 /* ca_maxoperations */ 4899 status = nfsd4_encode_count4(xdr, attrs->maxops); 4900 if (status != nfs_ok) 4901 return status; 4902 /* ca_maxrequests */ 4903 status = nfsd4_encode_count4(xdr, attrs->maxreqs); 4904 if (status != nfs_ok) 4905 return status; 4906 /* ca_rdma_ird<1> */ 4907 if (xdr_stream_encode_u32(xdr, attrs->nr_rdma_attrs) != XDR_UNIT) 4908 return nfserr_resource; 4909 if (attrs->nr_rdma_attrs) 4910 return nfsd4_encode_uint32_t(xdr, attrs->rdma_attrs); 4911 return nfs_ok; 4912 } 4913 4914 static __be32 4915 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, 4916 union nfsd4_op_u *u) 4917 { 4918 struct nfsd4_create_session *sess = &u->create_session; 4919 struct xdr_stream *xdr = resp->xdr; 4920 4921 /* csr_sessionid */ 4922 nfserr = nfsd4_encode_sessionid4(xdr, &sess->sessionid); 4923 if (nfserr != nfs_ok) 4924 return nfserr; 4925 /* csr_sequence */ 4926 nfserr = nfsd4_encode_sequenceid4(xdr, sess->seqid); 4927 if (nfserr != nfs_ok) 4928 return nfserr; 4929 /* csr_flags */ 4930 nfserr = nfsd4_encode_uint32_t(xdr, sess->flags); 4931 if (nfserr != nfs_ok) 4932 return nfserr; 4933 /* csr_fore_chan_attrs */ 4934 nfserr = nfsd4_encode_channel_attrs4(xdr, &sess->fore_channel); 4935 if (nfserr != nfs_ok) 4936 return nfserr; 4937 /* csr_back_chan_attrs */ 4938 return nfsd4_encode_channel_attrs4(xdr, &sess->back_channel); 4939 } 4940 4941 static __be32 4942 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, 4943 union nfsd4_op_u *u) 4944 { 4945 struct nfsd4_sequence *seq = &u->sequence; 4946 struct xdr_stream *xdr = resp->xdr; 4947 4948 /* sr_sessionid */ 4949 nfserr = nfsd4_encode_sessionid4(xdr, &seq->sessionid); 4950 if (nfserr != nfs_ok) 4951 return nfserr; 4952 /* sr_sequenceid */ 4953 nfserr = nfsd4_encode_sequenceid4(xdr, seq->seqid); 4954 if (nfserr != nfs_ok) 4955 return nfserr; 4956 /* sr_slotid */ 4957 nfserr = nfsd4_encode_slotid4(xdr, seq->slotid); 4958 if (nfserr != nfs_ok) 4959 return nfserr; 4960 /* Note slotid's are numbered from zero: */ 4961 /* sr_highest_slotid */ 4962 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1); 4963 if (nfserr != nfs_ok) 4964 return nfserr; 4965 /* sr_target_highest_slotid */ 4966 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1); 4967 if (nfserr != nfs_ok) 4968 return nfserr; 4969 /* sr_status_flags */ 4970 nfserr = nfsd4_encode_uint32_t(xdr, seq->status_flags); 4971 if (nfserr != nfs_ok) 4972 return nfserr; 4973 4974 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */ 4975 return nfs_ok; 4976 } 4977 4978 static __be32 4979 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, 4980 union nfsd4_op_u *u) 4981 { 4982 struct nfsd4_test_stateid *test_stateid = &u->test_stateid; 4983 struct nfsd4_test_stateid_id *stateid, *next; 4984 struct xdr_stream *xdr = resp->xdr; 4985 4986 /* tsr_status_codes<> */ 4987 if (xdr_stream_encode_u32(xdr, test_stateid->ts_num_ids) != XDR_UNIT) 4988 return nfserr_resource; 4989 list_for_each_entry_safe(stateid, next, 4990 &test_stateid->ts_stateid_list, ts_id_list) { 4991 if (xdr_stream_encode_be32(xdr, stateid->ts_id_status) != XDR_UNIT) 4992 return nfserr_resource; 4993 } 4994 return nfs_ok; 4995 } 4996 4997 static __be32 4998 nfsd4_encode_get_dir_delegation(struct nfsd4_compoundres *resp, __be32 nfserr, 4999 union nfsd4_op_u *u) 5000 { 5001 struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation; 5002 struct xdr_stream *xdr = resp->xdr; 5003 __be32 status = nfserr_resource; 5004 5005 switch(gdd->gddrnf_status) { 5006 case GDD4_OK: 5007 if (xdr_stream_encode_u32(xdr, GDD4_OK) != XDR_UNIT) 5008 break; 5009 status = nfsd4_encode_verifier4(xdr, &gdd->gddr_cookieverf); 5010 if (status) 5011 break; 5012 status = nfsd4_encode_stateid4(xdr, &gdd->gddr_stateid); 5013 if (status) 5014 break; 5015 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_notification[0], 0, 0); 5016 if (status) 5017 break; 5018 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_child_attributes[0], 5019 gdd->gddr_child_attributes[1], 5020 gdd->gddr_child_attributes[2]); 5021 if (status) 5022 break; 5023 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_dir_attributes[0], 5024 gdd->gddr_dir_attributes[1], 5025 gdd->gddr_dir_attributes[2]); 5026 break; 5027 default: 5028 pr_warn("nfsd: bad gddrnf_status (%u)\n", gdd->gddrnf_status); 5029 gdd->gddrnf_will_signal_deleg_avail = 0; 5030 fallthrough; 5031 case GDD4_UNAVAIL: 5032 if (xdr_stream_encode_u32(xdr, GDD4_UNAVAIL) != XDR_UNIT) 5033 break; 5034 status = nfsd4_encode_bool(xdr, gdd->gddrnf_will_signal_deleg_avail); 5035 break; 5036 } 5037 return status; 5038 } 5039 5040 #ifdef CONFIG_NFSD_PNFS 5041 static __be32 5042 nfsd4_encode_device_addr4(struct xdr_stream *xdr, 5043 const struct nfsd4_getdeviceinfo *gdev) 5044 { 5045 u32 needed_len, starting_len = xdr->buf->len; 5046 const struct nfsd4_layout_ops *ops; 5047 __be32 status; 5048 5049 /* da_layout_type */ 5050 if (xdr_stream_encode_u32(xdr, gdev->gd_layout_type) != XDR_UNIT) 5051 return nfserr_resource; 5052 /* da_addr_body */ 5053 ops = nfsd4_layout_ops[gdev->gd_layout_type]; 5054 status = ops->encode_getdeviceinfo(xdr, gdev); 5055 if (status != nfs_ok) { 5056 /* 5057 * Don't burden the layout drivers with enforcing 5058 * gd_maxcount. Just tell the client to come back 5059 * with a bigger buffer if it's not enough. 5060 */ 5061 if (xdr->buf->len + XDR_UNIT > gdev->gd_maxcount) 5062 goto toosmall; 5063 return status; 5064 } 5065 5066 return nfs_ok; 5067 5068 toosmall: 5069 needed_len = xdr->buf->len + XDR_UNIT; /* notifications */ 5070 xdr_truncate_encode(xdr, starting_len); 5071 5072 status = nfsd4_encode_count4(xdr, needed_len); 5073 if (status != nfs_ok) 5074 return status; 5075 return nfserr_toosmall; 5076 } 5077 5078 static __be32 5079 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 5080 union nfsd4_op_u *u) 5081 { 5082 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo; 5083 struct xdr_stream *xdr = resp->xdr; 5084 5085 /* gdir_device_addr */ 5086 nfserr = nfsd4_encode_device_addr4(xdr, gdev); 5087 if (nfserr) 5088 return nfserr; 5089 /* gdir_notification */ 5090 return nfsd4_encode_bitmap4(xdr, gdev->gd_notify_types, 0, 0); 5091 } 5092 5093 static __be32 5094 nfsd4_encode_layout4(struct xdr_stream *xdr, const struct nfsd4_layoutget *lgp) 5095 { 5096 const struct nfsd4_layout_ops *ops = nfsd4_layout_ops[lgp->lg_layout_type]; 5097 __be32 status; 5098 5099 /* lo_offset */ 5100 status = nfsd4_encode_offset4(xdr, lgp->lg_seg.offset); 5101 if (status != nfs_ok) 5102 return status; 5103 /* lo_length */ 5104 status = nfsd4_encode_length4(xdr, lgp->lg_seg.length); 5105 if (status != nfs_ok) 5106 return status; 5107 /* lo_iomode */ 5108 if (xdr_stream_encode_u32(xdr, lgp->lg_seg.iomode) != XDR_UNIT) 5109 return nfserr_resource; 5110 /* lo_content */ 5111 if (xdr_stream_encode_u32(xdr, lgp->lg_layout_type) != XDR_UNIT) 5112 return nfserr_resource; 5113 return ops->encode_layoutget(xdr, lgp); 5114 } 5115 5116 static __be32 5117 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, 5118 union nfsd4_op_u *u) 5119 { 5120 struct nfsd4_layoutget *lgp = &u->layoutget; 5121 struct xdr_stream *xdr = resp->xdr; 5122 5123 /* logr_return_on_close */ 5124 nfserr = nfsd4_encode_bool(xdr, true); 5125 if (nfserr != nfs_ok) 5126 return nfserr; 5127 /* logr_stateid */ 5128 nfserr = nfsd4_encode_stateid4(xdr, &lgp->lg_sid); 5129 if (nfserr != nfs_ok) 5130 return nfserr; 5131 /* logr_layout<> */ 5132 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT) 5133 return nfserr_resource; 5134 return nfsd4_encode_layout4(xdr, lgp); 5135 } 5136 5137 static __be32 5138 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, 5139 union nfsd4_op_u *u) 5140 { 5141 struct nfsd4_layoutcommit *lcp = &u->layoutcommit; 5142 struct xdr_stream *xdr = resp->xdr; 5143 5144 /* ns_sizechanged */ 5145 nfserr = nfsd4_encode_bool(xdr, lcp->lc_size_chg); 5146 if (nfserr != nfs_ok) 5147 return nfserr; 5148 if (lcp->lc_size_chg) 5149 /* ns_size */ 5150 return nfsd4_encode_length4(xdr, lcp->lc_newsize); 5151 return nfs_ok; 5152 } 5153 5154 static __be32 5155 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr, 5156 union nfsd4_op_u *u) 5157 { 5158 struct nfsd4_layoutreturn *lrp = &u->layoutreturn; 5159 struct xdr_stream *xdr = resp->xdr; 5160 5161 /* lrs_present */ 5162 nfserr = nfsd4_encode_bool(xdr, lrp->lrs_present); 5163 if (nfserr != nfs_ok) 5164 return nfserr; 5165 if (lrp->lrs_present) 5166 /* lrs_stateid */ 5167 return nfsd4_encode_stateid4(xdr, &lrp->lr_sid); 5168 return nfs_ok; 5169 } 5170 #endif /* CONFIG_NFSD_PNFS */ 5171 5172 static __be32 5173 nfsd4_encode_write_response4(struct xdr_stream *xdr, 5174 const struct nfsd4_copy *copy) 5175 { 5176 const struct nfsd42_write_res *write = ©->cp_res; 5177 u32 count = nfsd4_copy_is_sync(copy) ? 0 : 1; 5178 __be32 status; 5179 5180 /* wr_callback_id<1> */ 5181 if (xdr_stream_encode_u32(xdr, count) != XDR_UNIT) 5182 return nfserr_resource; 5183 if (count) { 5184 status = nfsd4_encode_stateid4(xdr, &write->cb_stateid); 5185 if (status != nfs_ok) 5186 return status; 5187 } 5188 5189 /* wr_count */ 5190 status = nfsd4_encode_length4(xdr, write->wr_bytes_written); 5191 if (status != nfs_ok) 5192 return status; 5193 /* wr_committed */ 5194 if (xdr_stream_encode_u32(xdr, write->wr_stable_how) != XDR_UNIT) 5195 return nfserr_resource; 5196 /* wr_writeverf */ 5197 return nfsd4_encode_verifier4(xdr, &write->wr_verifier); 5198 } 5199 5200 static __be32 nfsd4_encode_copy_requirements4(struct xdr_stream *xdr, 5201 const struct nfsd4_copy *copy) 5202 { 5203 __be32 status; 5204 5205 /* cr_consecutive */ 5206 status = nfsd4_encode_bool(xdr, true); 5207 if (status != nfs_ok) 5208 return status; 5209 /* cr_synchronous */ 5210 return nfsd4_encode_bool(xdr, nfsd4_copy_is_sync(copy)); 5211 } 5212 5213 static __be32 5214 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr, 5215 union nfsd4_op_u *u) 5216 { 5217 struct nfsd4_copy *copy = &u->copy; 5218 5219 nfserr = nfsd4_encode_write_response4(resp->xdr, copy); 5220 if (nfserr != nfs_ok) 5221 return nfserr; 5222 return nfsd4_encode_copy_requirements4(resp->xdr, copy); 5223 } 5224 5225 static __be32 5226 nfsd4_encode_netloc4(struct xdr_stream *xdr, const struct nl4_server *ns) 5227 { 5228 __be32 status; 5229 5230 if (xdr_stream_encode_u32(xdr, ns->nl4_type) != XDR_UNIT) 5231 return nfserr_resource; 5232 switch (ns->nl4_type) { 5233 case NL4_NETADDR: 5234 /* nl_addr */ 5235 status = nfsd4_encode_netaddr4(xdr, &ns->u.nl4_addr); 5236 break; 5237 default: 5238 status = nfserr_serverfault; 5239 } 5240 return status; 5241 } 5242 5243 static __be32 5244 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr, 5245 union nfsd4_op_u *u) 5246 { 5247 struct nfsd4_copy_notify *cn = &u->copy_notify; 5248 struct xdr_stream *xdr = resp->xdr; 5249 5250 /* cnr_lease_time */ 5251 nfserr = nfsd4_encode_nfstime4(xdr, &cn->cpn_lease_time); 5252 if (nfserr) 5253 return nfserr; 5254 /* cnr_stateid */ 5255 nfserr = nfsd4_encode_stateid4(xdr, &cn->cpn_cnr_stateid); 5256 if (nfserr) 5257 return nfserr; 5258 /* cnr_source_server<> */ 5259 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT) 5260 return nfserr_resource; 5261 return nfsd4_encode_netloc4(xdr, cn->cpn_src); 5262 } 5263 5264 static __be32 5265 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr, 5266 union nfsd4_op_u *u) 5267 { 5268 struct nfsd4_offload_status *os = &u->offload_status; 5269 struct xdr_stream *xdr = resp->xdr; 5270 5271 /* osr_count */ 5272 nfserr = nfsd4_encode_length4(xdr, os->count); 5273 if (nfserr != nfs_ok) 5274 return nfserr; 5275 /* osr_complete<1> */ 5276 if (os->completed) { 5277 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT) 5278 return nfserr_resource; 5279 if (xdr_stream_encode_be32(xdr, os->status) != XDR_UNIT) 5280 return nfserr_resource; 5281 } else if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT) 5282 return nfserr_resource; 5283 return nfs_ok; 5284 } 5285 5286 static __be32 5287 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp, 5288 struct nfsd4_read *read) 5289 { 5290 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp; 5291 struct file *file = read->rd_nf->nf_file; 5292 struct xdr_stream *xdr = resp->xdr; 5293 bool splice_ok = argp->splice_ok; 5294 unsigned long maxcount; 5295 __be32 nfserr, *p; 5296 5297 /* Content type, offset, byte count */ 5298 p = xdr_reserve_space(xdr, 4 + 8 + 4); 5299 if (!p) 5300 return nfserr_io; 5301 if (resp->xdr->buf->page_len && splice_ok) { 5302 WARN_ON_ONCE(splice_ok); 5303 return nfserr_serverfault; 5304 } 5305 5306 maxcount = min_t(unsigned long, read->rd_length, 5307 (xdr->buf->buflen - xdr->buf->len)); 5308 5309 if (file->f_op->splice_read && splice_ok) 5310 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 5311 else 5312 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 5313 if (nfserr) 5314 return nfserr; 5315 5316 *p++ = cpu_to_be32(NFS4_CONTENT_DATA); 5317 p = xdr_encode_hyper(p, read->rd_offset); 5318 *p = cpu_to_be32(read->rd_length); 5319 5320 return nfs_ok; 5321 } 5322 5323 static __be32 5324 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr, 5325 union nfsd4_op_u *u) 5326 { 5327 struct nfsd4_read *read = &u->read; 5328 struct file *file = read->rd_nf->nf_file; 5329 struct xdr_stream *xdr = resp->xdr; 5330 int starting_len = xdr->buf->len; 5331 u32 segments = 0; 5332 __be32 *p; 5333 5334 if (nfserr) 5335 return nfserr; 5336 5337 /* eof flag, segment count */ 5338 p = xdr_reserve_space(xdr, 4 + 4); 5339 if (!p) 5340 return nfserr_io; 5341 xdr_commit_encode(xdr); 5342 5343 read->rd_eof = read->rd_offset >= i_size_read(file_inode(file)); 5344 if (read->rd_eof) 5345 goto out; 5346 5347 nfserr = nfsd4_encode_read_plus_data(resp, read); 5348 if (nfserr) { 5349 xdr_truncate_encode(xdr, starting_len); 5350 return nfserr; 5351 } 5352 5353 segments++; 5354 5355 out: 5356 p = xdr_encode_bool(p, read->rd_eof); 5357 *p = cpu_to_be32(segments); 5358 return nfserr; 5359 } 5360 5361 static __be32 5362 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, 5363 union nfsd4_op_u *u) 5364 { 5365 struct nfsd4_seek *seek = &u->seek; 5366 struct xdr_stream *xdr = resp->xdr; 5367 5368 /* sr_eof */ 5369 nfserr = nfsd4_encode_bool(xdr, seek->seek_eof); 5370 if (nfserr != nfs_ok) 5371 return nfserr; 5372 /* sr_offset */ 5373 return nfsd4_encode_offset4(xdr, seek->seek_pos); 5374 } 5375 5376 static __be32 5377 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, 5378 union nfsd4_op_u *p) 5379 { 5380 return nfserr; 5381 } 5382 5383 /* 5384 * Encode kmalloc-ed buffer in to XDR stream. 5385 */ 5386 static __be32 5387 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen) 5388 { 5389 u32 cplen; 5390 __be32 *p; 5391 5392 cplen = min_t(unsigned long, buflen, 5393 ((void *)xdr->end - (void *)xdr->p)); 5394 p = xdr_reserve_space(xdr, cplen); 5395 if (!p) 5396 return nfserr_resource; 5397 5398 memcpy(p, buf, cplen); 5399 buf += cplen; 5400 buflen -= cplen; 5401 5402 while (buflen) { 5403 cplen = min_t(u32, buflen, PAGE_SIZE); 5404 p = xdr_reserve_space(xdr, cplen); 5405 if (!p) 5406 return nfserr_resource; 5407 5408 memcpy(p, buf, cplen); 5409 5410 if (cplen < PAGE_SIZE) { 5411 /* 5412 * We're done, with a length that wasn't page 5413 * aligned, so possibly not word aligned. Pad 5414 * any trailing bytes with 0. 5415 */ 5416 xdr_encode_opaque_fixed(p, NULL, cplen); 5417 break; 5418 } 5419 5420 buflen -= PAGE_SIZE; 5421 buf += PAGE_SIZE; 5422 } 5423 5424 return 0; 5425 } 5426 5427 static __be32 5428 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5429 union nfsd4_op_u *u) 5430 { 5431 struct nfsd4_getxattr *getxattr = &u->getxattr; 5432 struct xdr_stream *xdr = resp->xdr; 5433 __be32 *p, err; 5434 5435 p = xdr_reserve_space(xdr, 4); 5436 if (!p) 5437 return nfserr_resource; 5438 5439 *p = cpu_to_be32(getxattr->getxa_len); 5440 5441 if (getxattr->getxa_len == 0) 5442 return 0; 5443 5444 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf, 5445 getxattr->getxa_len); 5446 5447 kvfree(getxattr->getxa_buf); 5448 5449 return err; 5450 } 5451 5452 static __be32 5453 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5454 union nfsd4_op_u *u) 5455 { 5456 struct nfsd4_setxattr *setxattr = &u->setxattr; 5457 struct xdr_stream *xdr = resp->xdr; 5458 5459 return nfsd4_encode_change_info4(xdr, &setxattr->setxa_cinfo); 5460 } 5461 5462 /* 5463 * See if there are cookie values that can be rejected outright. 5464 */ 5465 static __be32 5466 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs, 5467 u32 *offsetp) 5468 { 5469 u64 cookie = listxattrs->lsxa_cookie; 5470 5471 /* 5472 * If the cookie is larger than the maximum number we can fit 5473 * in the buffer we just got back from vfs_listxattr, it's invalid. 5474 */ 5475 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2)) 5476 return nfserr_badcookie; 5477 5478 *offsetp = (u32)cookie; 5479 return 0; 5480 } 5481 5482 static __be32 5483 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr, 5484 union nfsd4_op_u *u) 5485 { 5486 struct nfsd4_listxattrs *listxattrs = &u->listxattrs; 5487 struct xdr_stream *xdr = resp->xdr; 5488 u32 cookie_offset, count_offset, eof; 5489 u32 left, xdrleft, slen, count; 5490 u32 xdrlen, offset; 5491 u64 cookie; 5492 char *sp; 5493 __be32 status, tmp; 5494 __be64 wire_cookie; 5495 __be32 *p; 5496 u32 nuser; 5497 5498 eof = 1; 5499 5500 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset); 5501 if (status) 5502 goto out; 5503 5504 /* 5505 * Reserve space for the cookie and the name array count. Record 5506 * the offsets to save them later. 5507 */ 5508 cookie_offset = xdr->buf->len; 5509 count_offset = cookie_offset + 8; 5510 p = xdr_reserve_space(xdr, XDR_UNIT * 3); 5511 if (!p) { 5512 status = nfserr_resource; 5513 goto out; 5514 } 5515 5516 count = 0; 5517 left = listxattrs->lsxa_len; 5518 sp = listxattrs->lsxa_buf; 5519 nuser = 0; 5520 5521 /* Bytes left is maxcount - 8 (cookie) - 4 (array count) */ 5522 xdrleft = listxattrs->lsxa_maxcount - XDR_UNIT * 3; 5523 5524 while (left > 0 && xdrleft > 0) { 5525 slen = strlen(sp); 5526 5527 /* 5528 * Check if this is a "user." attribute, skip it if not. 5529 */ 5530 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) 5531 goto contloop; 5532 5533 slen -= XATTR_USER_PREFIX_LEN; 5534 xdrlen = 4 + ((slen + 3) & ~3); 5535 /* Check if both entry and eof can fit in the XDR buffer */ 5536 if (xdrlen + XDR_UNIT > xdrleft) { 5537 if (count == 0) { 5538 /* 5539 * Can't even fit the first attribute name. 5540 */ 5541 status = nfserr_toosmall; 5542 goto out; 5543 } 5544 eof = 0; 5545 goto wreof; 5546 } 5547 5548 left -= XATTR_USER_PREFIX_LEN; 5549 sp += XATTR_USER_PREFIX_LEN; 5550 if (nuser++ < offset) 5551 goto contloop; 5552 5553 5554 p = xdr_reserve_space(xdr, xdrlen); 5555 if (!p) { 5556 status = nfserr_resource; 5557 goto out; 5558 } 5559 5560 xdr_encode_opaque(p, sp, slen); 5561 5562 xdrleft -= xdrlen; 5563 count++; 5564 contloop: 5565 sp += slen + 1; 5566 left -= slen + 1; 5567 } 5568 5569 /* 5570 * If there were user attributes to copy, but we didn't copy 5571 * any, the offset was too large (e.g. the cookie was invalid). 5572 */ 5573 if (nuser > 0 && count == 0) { 5574 status = nfserr_badcookie; 5575 goto out; 5576 } 5577 5578 wreof: 5579 p = xdr_reserve_space(xdr, 4); 5580 if (!p) { 5581 status = nfserr_resource; 5582 goto out; 5583 } 5584 *p = cpu_to_be32(eof); 5585 5586 cookie = offset + count; 5587 5588 wire_cookie = cpu_to_be64(cookie); 5589 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &wire_cookie, 8); 5590 tmp = cpu_to_be32(count); 5591 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4); 5592 out: 5593 if (listxattrs->lsxa_len) 5594 kvfree(listxattrs->lsxa_buf); 5595 return status; 5596 } 5597 5598 static __be32 5599 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5600 union nfsd4_op_u *u) 5601 { 5602 struct nfsd4_removexattr *removexattr = &u->removexattr; 5603 struct xdr_stream *xdr = resp->xdr; 5604 5605 return nfsd4_encode_change_info4(xdr, &removexattr->rmxa_cinfo); 5606 } 5607 5608 typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u); 5609 5610 /* 5611 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1 5612 * since we don't need to filter out obsolete ops as this is 5613 * done in the decoding phase. 5614 */ 5615 static const nfsd4_enc nfsd4_enc_ops[] = { 5616 [OP_ACCESS] = nfsd4_encode_access, 5617 [OP_CLOSE] = nfsd4_encode_close, 5618 [OP_COMMIT] = nfsd4_encode_commit, 5619 [OP_CREATE] = nfsd4_encode_create, 5620 [OP_DELEGPURGE] = nfsd4_encode_noop, 5621 [OP_DELEGRETURN] = nfsd4_encode_noop, 5622 [OP_GETATTR] = nfsd4_encode_getattr, 5623 [OP_GETFH] = nfsd4_encode_getfh, 5624 [OP_LINK] = nfsd4_encode_link, 5625 [OP_LOCK] = nfsd4_encode_lock, 5626 [OP_LOCKT] = nfsd4_encode_lockt, 5627 [OP_LOCKU] = nfsd4_encode_locku, 5628 [OP_LOOKUP] = nfsd4_encode_noop, 5629 [OP_LOOKUPP] = nfsd4_encode_noop, 5630 [OP_NVERIFY] = nfsd4_encode_noop, 5631 [OP_OPEN] = nfsd4_encode_open, 5632 [OP_OPENATTR] = nfsd4_encode_noop, 5633 [OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm, 5634 [OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade, 5635 [OP_PUTFH] = nfsd4_encode_noop, 5636 [OP_PUTPUBFH] = nfsd4_encode_noop, 5637 [OP_PUTROOTFH] = nfsd4_encode_noop, 5638 [OP_READ] = nfsd4_encode_read, 5639 [OP_READDIR] = nfsd4_encode_readdir, 5640 [OP_READLINK] = nfsd4_encode_readlink, 5641 [OP_REMOVE] = nfsd4_encode_remove, 5642 [OP_RENAME] = nfsd4_encode_rename, 5643 [OP_RENEW] = nfsd4_encode_noop, 5644 [OP_RESTOREFH] = nfsd4_encode_noop, 5645 [OP_SAVEFH] = nfsd4_encode_noop, 5646 [OP_SECINFO] = nfsd4_encode_secinfo, 5647 [OP_SETATTR] = nfsd4_encode_setattr, 5648 [OP_SETCLIENTID] = nfsd4_encode_setclientid, 5649 [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop, 5650 [OP_VERIFY] = nfsd4_encode_noop, 5651 [OP_WRITE] = nfsd4_encode_write, 5652 [OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop, 5653 5654 /* NFSv4.1 operations */ 5655 [OP_BACKCHANNEL_CTL] = nfsd4_encode_noop, 5656 [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session, 5657 [OP_EXCHANGE_ID] = nfsd4_encode_exchange_id, 5658 [OP_CREATE_SESSION] = nfsd4_encode_create_session, 5659 [OP_DESTROY_SESSION] = nfsd4_encode_noop, 5660 [OP_FREE_STATEID] = nfsd4_encode_noop, 5661 [OP_GET_DIR_DELEGATION] = nfsd4_encode_get_dir_delegation, 5662 #ifdef CONFIG_NFSD_PNFS 5663 [OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo, 5664 [OP_GETDEVICELIST] = nfsd4_encode_noop, 5665 [OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit, 5666 [OP_LAYOUTGET] = nfsd4_encode_layoutget, 5667 [OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn, 5668 #else 5669 [OP_GETDEVICEINFO] = nfsd4_encode_noop, 5670 [OP_GETDEVICELIST] = nfsd4_encode_noop, 5671 [OP_LAYOUTCOMMIT] = nfsd4_encode_noop, 5672 [OP_LAYOUTGET] = nfsd4_encode_noop, 5673 [OP_LAYOUTRETURN] = nfsd4_encode_noop, 5674 #endif 5675 [OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name, 5676 [OP_SEQUENCE] = nfsd4_encode_sequence, 5677 [OP_SET_SSV] = nfsd4_encode_noop, 5678 [OP_TEST_STATEID] = nfsd4_encode_test_stateid, 5679 [OP_WANT_DELEGATION] = nfsd4_encode_noop, 5680 [OP_DESTROY_CLIENTID] = nfsd4_encode_noop, 5681 [OP_RECLAIM_COMPLETE] = nfsd4_encode_noop, 5682 5683 /* NFSv4.2 operations */ 5684 [OP_ALLOCATE] = nfsd4_encode_noop, 5685 [OP_COPY] = nfsd4_encode_copy, 5686 [OP_COPY_NOTIFY] = nfsd4_encode_copy_notify, 5687 [OP_DEALLOCATE] = nfsd4_encode_noop, 5688 [OP_IO_ADVISE] = nfsd4_encode_noop, 5689 [OP_LAYOUTERROR] = nfsd4_encode_noop, 5690 [OP_LAYOUTSTATS] = nfsd4_encode_noop, 5691 [OP_OFFLOAD_CANCEL] = nfsd4_encode_noop, 5692 [OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status, 5693 [OP_READ_PLUS] = nfsd4_encode_read_plus, 5694 [OP_SEEK] = nfsd4_encode_seek, 5695 [OP_WRITE_SAME] = nfsd4_encode_noop, 5696 [OP_CLONE] = nfsd4_encode_noop, 5697 5698 /* RFC 8276 extended atributes operations */ 5699 [OP_GETXATTR] = nfsd4_encode_getxattr, 5700 [OP_SETXATTR] = nfsd4_encode_setxattr, 5701 [OP_LISTXATTRS] = nfsd4_encode_listxattrs, 5702 [OP_REMOVEXATTR] = nfsd4_encode_removexattr, 5703 }; 5704 5705 /* 5706 * Calculate whether we still have space to encode repsize bytes. 5707 * There are two considerations: 5708 * - For NFS versions >=4.1, the size of the reply must stay within 5709 * session limits 5710 * - For all NFS versions, we must stay within limited preallocated 5711 * buffer space. 5712 * 5713 * This is called before the operation is processed, so can only provide 5714 * an upper estimate. For some nonidempotent operations (such as 5715 * getattr), it's not necessarily a problem if that estimate is wrong, 5716 * as we can fail it after processing without significant side effects. 5717 */ 5718 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize) 5719 { 5720 struct xdr_buf *buf = &resp->rqstp->rq_res; 5721 struct nfsd4_slot *slot = resp->cstate.slot; 5722 5723 if (buf->len + respsize <= buf->buflen) 5724 return nfs_ok; 5725 if (!nfsd4_has_session(&resp->cstate)) 5726 return nfserr_resource; 5727 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) { 5728 WARN_ON_ONCE(1); 5729 return nfserr_rep_too_big_to_cache; 5730 } 5731 return nfserr_rep_too_big; 5732 } 5733 5734 void 5735 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 5736 { 5737 struct xdr_stream *xdr = resp->xdr; 5738 struct nfs4_stateowner *so = resp->cstate.replay_owner; 5739 struct svc_rqst *rqstp = resp->rqstp; 5740 const struct nfsd4_operation *opdesc = op->opdesc; 5741 int post_err_offset; 5742 nfsd4_enc encoder; 5743 __be32 *p; 5744 5745 p = xdr_reserve_space(xdr, 8); 5746 if (!p) 5747 goto release; 5748 *p++ = cpu_to_be32(op->opnum); 5749 post_err_offset = xdr->buf->len; 5750 5751 if (op->opnum == OP_ILLEGAL) 5752 goto status; 5753 if (op->status && opdesc && 5754 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE)) 5755 goto status; 5756 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || 5757 !nfsd4_enc_ops[op->opnum]); 5758 encoder = nfsd4_enc_ops[op->opnum]; 5759 op->status = encoder(resp, op->status, &op->u); 5760 if (op->status) 5761 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status); 5762 xdr_commit_encode(xdr); 5763 5764 /* nfsd4_check_resp_size guarantees enough room for error status */ 5765 if (!op->status) { 5766 int space_needed = 0; 5767 if (!nfsd4_last_compound_op(rqstp)) 5768 space_needed = COMPOUND_ERR_SLACK_SPACE; 5769 op->status = nfsd4_check_resp_size(resp, space_needed); 5770 } 5771 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) { 5772 struct nfsd4_slot *slot = resp->cstate.slot; 5773 5774 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) 5775 op->status = nfserr_rep_too_big_to_cache; 5776 else 5777 op->status = nfserr_rep_too_big; 5778 } 5779 if (op->status == nfserr_resource || 5780 op->status == nfserr_rep_too_big || 5781 op->status == nfserr_rep_too_big_to_cache) { 5782 /* 5783 * The operation may have already been encoded or 5784 * partially encoded. No op returns anything additional 5785 * in the case of one of these three errors, so we can 5786 * just truncate back to after the status. But it's a 5787 * bug if we had to do this on a non-idempotent op: 5788 */ 5789 warn_on_nonidempotent_op(op); 5790 xdr_truncate_encode(xdr, post_err_offset); 5791 } 5792 if (so) { 5793 int len = xdr->buf->len - post_err_offset; 5794 5795 so->so_replay.rp_status = op->status; 5796 so->so_replay.rp_buflen = len; 5797 read_bytes_from_xdr_buf(xdr->buf, post_err_offset, 5798 so->so_replay.rp_buf, len); 5799 } 5800 status: 5801 *p = op->status; 5802 release: 5803 if (opdesc && opdesc->op_release) 5804 opdesc->op_release(&op->u); 5805 5806 /* 5807 * Account for pages consumed while encoding this operation. 5808 * The xdr_stream primitives don't manage rq_next_page. 5809 */ 5810 rqstp->rq_next_page = xdr->page_ptr + 1; 5811 } 5812 5813 /** 5814 * nfsd4_encode_replay - encode a result stored in the stateowner reply cache 5815 * @xdr: send buffer's XDR stream 5816 * @op: operation being replayed 5817 * 5818 * @op->replay->rp_buf contains the previously-sent already-encoded result. 5819 */ 5820 void nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op) 5821 { 5822 struct nfs4_replay *rp = op->replay; 5823 5824 trace_nfsd_stateowner_replay(op->opnum, rp); 5825 5826 if (xdr_stream_encode_u32(xdr, op->opnum) != XDR_UNIT) 5827 return; 5828 if (xdr_stream_encode_be32(xdr, rp->rp_status) != XDR_UNIT) 5829 return; 5830 xdr_stream_encode_opaque_fixed(xdr, rp->rp_buf, rp->rp_buflen); 5831 } 5832 5833 void nfsd4_release_compoundargs(struct svc_rqst *rqstp) 5834 { 5835 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5836 5837 if (args->ops != args->iops) { 5838 vfree(args->ops); 5839 args->ops = args->iops; 5840 } 5841 while (args->to_free) { 5842 struct svcxdr_tmpbuf *tb = args->to_free; 5843 args->to_free = tb->next; 5844 kfree(tb); 5845 } 5846 } 5847 5848 bool 5849 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5850 { 5851 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5852 5853 /* svcxdr_tmp_alloc */ 5854 args->to_free = NULL; 5855 5856 args->xdr = xdr; 5857 args->ops = args->iops; 5858 args->rqstp = rqstp; 5859 5860 return nfsd4_decode_compound(args); 5861 } 5862 5863 bool 5864 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5865 { 5866 struct nfsd4_compoundres *resp = rqstp->rq_resp; 5867 __be32 *p; 5868 5869 /* 5870 * Send buffer space for the following items is reserved 5871 * at the top of nfsd4_proc_compound(). 5872 */ 5873 p = resp->statusp; 5874 5875 *p++ = resp->cstate.status; 5876 *p++ = htonl(resp->taglen); 5877 memcpy(p, resp->tag, resp->taglen); 5878 p += XDR_QUADLEN(resp->taglen); 5879 *p++ = htonl(resp->opcnt); 5880 5881 nfsd4_sequence_done(resp); 5882 return true; 5883 } 5884