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, u32 len) 122 { 123 struct svcxdr_tmpbuf *tb; 124 125 tb = kmalloc(sizeof(*tb) + 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, u32 len) 142 { 143 char *p = svcxdr_tmpalloc(argp, 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, u32 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 #ifdef CONFIG_NFSD_PNFS 1736 static __be32 1737 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp, 1738 union nfsd4_op_u *u) 1739 { 1740 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo; 1741 __be32 status; 1742 1743 memset(gdev, 0, sizeof(*gdev)); 1744 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid); 1745 if (status) 1746 return status; 1747 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0) 1748 return nfserr_bad_xdr; 1749 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0) 1750 return nfserr_bad_xdr; 1751 if (xdr_stream_decode_uint32_array(argp->xdr, 1752 &gdev->gd_notify_types, 1) < 0) 1753 return nfserr_bad_xdr; 1754 1755 return nfs_ok; 1756 } 1757 1758 static __be32 1759 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp, 1760 union nfsd4_op_u *u) 1761 { 1762 struct nfsd4_layoutcommit *lcp = &u->layoutcommit; 1763 __be32 *p, status; 1764 1765 memset(lcp, 0, sizeof(*lcp)); 1766 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0) 1767 return nfserr_bad_xdr; 1768 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0) 1769 return nfserr_bad_xdr; 1770 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0) 1771 return nfserr_bad_xdr; 1772 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid); 1773 if (status) 1774 return status; 1775 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0) 1776 return nfserr_bad_xdr; 1777 if (lcp->lc_newoffset) { 1778 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0) 1779 return nfserr_bad_xdr; 1780 } else 1781 lcp->lc_last_wr = 0; 1782 p = xdr_inline_decode(argp->xdr, XDR_UNIT); 1783 if (!p) 1784 return nfserr_bad_xdr; 1785 if (xdr_item_is_present(p)) { 1786 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime); 1787 if (status) 1788 return status; 1789 } else { 1790 lcp->lc_mtime.tv_nsec = UTIME_NOW; 1791 } 1792 return nfsd4_decode_layoutupdate4(argp, lcp); 1793 } 1794 1795 static __be32 1796 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp, 1797 union nfsd4_op_u *u) 1798 { 1799 struct nfsd4_layoutget *lgp = &u->layoutget; 1800 __be32 status; 1801 1802 memset(lgp, 0, sizeof(*lgp)); 1803 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0) 1804 return nfserr_bad_xdr; 1805 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0) 1806 return nfserr_bad_xdr; 1807 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0) 1808 return nfserr_bad_xdr; 1809 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0) 1810 return nfserr_bad_xdr; 1811 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0) 1812 return nfserr_bad_xdr; 1813 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0) 1814 return nfserr_bad_xdr; 1815 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid); 1816 if (status) 1817 return status; 1818 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0) 1819 return nfserr_bad_xdr; 1820 1821 return nfs_ok; 1822 } 1823 1824 static __be32 1825 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp, 1826 union nfsd4_op_u *u) 1827 { 1828 struct nfsd4_layoutreturn *lrp = &u->layoutreturn; 1829 memset(lrp, 0, sizeof(*lrp)); 1830 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0) 1831 return nfserr_bad_xdr; 1832 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0) 1833 return nfserr_bad_xdr; 1834 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0) 1835 return nfserr_bad_xdr; 1836 return nfsd4_decode_layoutreturn4(argp, lrp); 1837 } 1838 #endif /* CONFIG_NFSD_PNFS */ 1839 1840 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp, 1841 union nfsd4_op_u *u) 1842 { 1843 struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name; 1844 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0) 1845 return nfserr_bad_xdr; 1846 1847 sin->sin_exp = NULL; 1848 return nfs_ok; 1849 } 1850 1851 static __be32 1852 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp, 1853 union nfsd4_op_u *u) 1854 { 1855 struct nfsd4_sequence *seq = &u->sequence; 1856 __be32 *p, status; 1857 1858 status = nfsd4_decode_sessionid4(argp, &seq->sessionid); 1859 if (status) 1860 return status; 1861 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4); 1862 if (!p) 1863 return nfserr_bad_xdr; 1864 seq->seqid = be32_to_cpup(p++); 1865 seq->slotid = be32_to_cpup(p++); 1866 seq->maxslots = be32_to_cpup(p++); 1867 seq->cachethis = be32_to_cpup(p); 1868 1869 seq->status_flags = 0; 1870 return nfs_ok; 1871 } 1872 1873 static __be32 1874 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, 1875 union nfsd4_op_u *u) 1876 { 1877 struct nfsd4_test_stateid *test_stateid = &u->test_stateid; 1878 struct nfsd4_test_stateid_id *stateid; 1879 __be32 status; 1880 u32 i; 1881 1882 memset(test_stateid, 0, sizeof(*test_stateid)); 1883 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0) 1884 return nfserr_bad_xdr; 1885 1886 INIT_LIST_HEAD(&test_stateid->ts_stateid_list); 1887 for (i = 0; i < test_stateid->ts_num_ids; i++) { 1888 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); 1889 if (!stateid) 1890 return nfserr_jukebox; 1891 INIT_LIST_HEAD(&stateid->ts_id_list); 1892 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); 1893 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid); 1894 if (status) 1895 return status; 1896 } 1897 1898 return nfs_ok; 1899 } 1900 1901 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, 1902 union nfsd4_op_u *u) 1903 { 1904 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid; 1905 return nfsd4_decode_clientid4(argp, &dc->clientid); 1906 } 1907 1908 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, 1909 union nfsd4_op_u *u) 1910 { 1911 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete; 1912 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0) 1913 return nfserr_bad_xdr; 1914 return nfs_ok; 1915 } 1916 1917 static __be32 1918 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp, 1919 union nfsd4_op_u *u) 1920 { 1921 struct nfsd4_fallocate *fallocate = &u->allocate; 1922 __be32 status; 1923 1924 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid); 1925 if (status) 1926 return status; 1927 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0) 1928 return nfserr_bad_xdr; 1929 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0) 1930 return nfserr_bad_xdr; 1931 1932 return nfs_ok; 1933 } 1934 1935 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp, 1936 struct nl4_server *ns) 1937 { 1938 struct nfs42_netaddr *naddr; 1939 __be32 *p; 1940 1941 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0) 1942 return nfserr_bad_xdr; 1943 1944 /* currently support for 1 inter-server source server */ 1945 switch (ns->nl4_type) { 1946 case NL4_NETADDR: 1947 naddr = &ns->u.nl4_addr; 1948 1949 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0) 1950 return nfserr_bad_xdr; 1951 if (naddr->netid_len > RPCBIND_MAXNETIDLEN) 1952 return nfserr_bad_xdr; 1953 1954 p = xdr_inline_decode(argp->xdr, naddr->netid_len); 1955 if (!p) 1956 return nfserr_bad_xdr; 1957 memcpy(naddr->netid, p, naddr->netid_len); 1958 1959 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0) 1960 return nfserr_bad_xdr; 1961 if (naddr->addr_len > RPCBIND_MAXUADDRLEN) 1962 return nfserr_bad_xdr; 1963 1964 p = xdr_inline_decode(argp->xdr, naddr->addr_len); 1965 if (!p) 1966 return nfserr_bad_xdr; 1967 memcpy(naddr->addr, p, naddr->addr_len); 1968 break; 1969 default: 1970 return nfserr_bad_xdr; 1971 } 1972 1973 return nfs_ok; 1974 } 1975 1976 static __be32 1977 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1978 { 1979 struct nfsd4_copy *copy = &u->copy; 1980 u32 consecutive, i, count, sync; 1981 struct nl4_server *ns_dummy; 1982 __be32 status; 1983 1984 memset(copy, 0, sizeof(*copy)); 1985 status = nfsd4_decode_stateid4(argp, ©->cp_src_stateid); 1986 if (status) 1987 return status; 1988 status = nfsd4_decode_stateid4(argp, ©->cp_dst_stateid); 1989 if (status) 1990 return status; 1991 if (xdr_stream_decode_u64(argp->xdr, ©->cp_src_pos) < 0) 1992 return nfserr_bad_xdr; 1993 if (xdr_stream_decode_u64(argp->xdr, ©->cp_dst_pos) < 0) 1994 return nfserr_bad_xdr; 1995 if (xdr_stream_decode_u64(argp->xdr, ©->cp_count) < 0) 1996 return nfserr_bad_xdr; 1997 /* ca_consecutive: we always do consecutive copies */ 1998 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0) 1999 return nfserr_bad_xdr; 2000 if (xdr_stream_decode_bool(argp->xdr, &sync) < 0) 2001 return nfserr_bad_xdr; 2002 nfsd4_copy_set_sync(copy, sync); 2003 2004 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 2005 return nfserr_bad_xdr; 2006 copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src)); 2007 if (copy->cp_src == NULL) 2008 return nfserr_jukebox; 2009 if (count == 0) { /* intra-server copy */ 2010 __set_bit(NFSD4_COPY_F_INTRA, ©->cp_flags); 2011 return nfs_ok; 2012 } 2013 2014 /* decode all the supplied server addresses but use only the first */ 2015 status = nfsd4_decode_nl4_server(argp, copy->cp_src); 2016 if (status) 2017 return status; 2018 2019 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL); 2020 if (ns_dummy == NULL) 2021 return nfserr_jukebox; 2022 for (i = 0; i < count - 1; i++) { 2023 status = nfsd4_decode_nl4_server(argp, ns_dummy); 2024 if (status) { 2025 kfree(ns_dummy); 2026 return status; 2027 } 2028 } 2029 kfree(ns_dummy); 2030 2031 return nfs_ok; 2032 } 2033 2034 static __be32 2035 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp, 2036 union nfsd4_op_u *u) 2037 { 2038 struct nfsd4_copy_notify *cn = &u->copy_notify; 2039 __be32 status; 2040 2041 memset(cn, 0, sizeof(*cn)); 2042 cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src)); 2043 if (cn->cpn_src == NULL) 2044 return nfserr_jukebox; 2045 cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst)); 2046 if (cn->cpn_dst == NULL) 2047 return nfserr_jukebox; 2048 2049 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid); 2050 if (status) 2051 return status; 2052 return nfsd4_decode_nl4_server(argp, cn->cpn_dst); 2053 } 2054 2055 static __be32 2056 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp, 2057 union nfsd4_op_u *u) 2058 { 2059 struct nfsd4_offload_status *os = &u->offload_status; 2060 os->count = 0; 2061 os->status = 0; 2062 return nfsd4_decode_stateid4(argp, &os->stateid); 2063 } 2064 2065 static __be32 2066 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 2067 { 2068 struct nfsd4_seek *seek = &u->seek; 2069 __be32 status; 2070 2071 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid); 2072 if (status) 2073 return status; 2074 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0) 2075 return nfserr_bad_xdr; 2076 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0) 2077 return nfserr_bad_xdr; 2078 2079 seek->seek_eof = 0; 2080 seek->seek_pos = 0; 2081 return nfs_ok; 2082 } 2083 2084 static __be32 2085 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 2086 { 2087 struct nfsd4_clone *clone = &u->clone; 2088 __be32 status; 2089 2090 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid); 2091 if (status) 2092 return status; 2093 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid); 2094 if (status) 2095 return status; 2096 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0) 2097 return nfserr_bad_xdr; 2098 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0) 2099 return nfserr_bad_xdr; 2100 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0) 2101 return nfserr_bad_xdr; 2102 2103 return nfs_ok; 2104 } 2105 2106 /* 2107 * XDR data that is more than PAGE_SIZE in size is normally part of a 2108 * read or write. However, the size of extended attributes is limited 2109 * by the maximum request size, and then further limited by the underlying 2110 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX 2111 * is 64k). Since there is no kvec- or page-based interface to xattrs, 2112 * and we're not dealing with contiguous pages, we need to do some copying. 2113 */ 2114 2115 /* 2116 * Decode data into buffer. 2117 */ 2118 static __be32 2119 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr, 2120 char **bufp, u32 buflen) 2121 { 2122 struct page **pages = xdr->pages; 2123 struct kvec *head = xdr->head; 2124 char *tmp, *dp; 2125 u32 len; 2126 2127 if (buflen <= head->iov_len) { 2128 /* 2129 * We're in luck, the head has enough space. Just return 2130 * the head, no need for copying. 2131 */ 2132 *bufp = head->iov_base; 2133 return 0; 2134 } 2135 2136 tmp = svcxdr_tmpalloc(argp, buflen); 2137 if (tmp == NULL) 2138 return nfserr_jukebox; 2139 2140 dp = tmp; 2141 memcpy(dp, head->iov_base, head->iov_len); 2142 buflen -= head->iov_len; 2143 dp += head->iov_len; 2144 2145 while (buflen > 0) { 2146 len = min_t(u32, buflen, PAGE_SIZE); 2147 memcpy(dp, page_address(*pages), len); 2148 2149 buflen -= len; 2150 dp += len; 2151 pages++; 2152 } 2153 2154 *bufp = tmp; 2155 return 0; 2156 } 2157 2158 /* 2159 * Get a user extended attribute name from the XDR buffer. 2160 * It will not have the "user." prefix, so prepend it. 2161 * Lastly, check for nul characters in the name. 2162 */ 2163 static __be32 2164 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep) 2165 { 2166 char *name, *sp, *dp; 2167 u32 namelen, cnt; 2168 __be32 *p; 2169 2170 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0) 2171 return nfserr_bad_xdr; 2172 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN)) 2173 return nfserr_nametoolong; 2174 if (namelen == 0) 2175 return nfserr_bad_xdr; 2176 p = xdr_inline_decode(argp->xdr, namelen); 2177 if (!p) 2178 return nfserr_bad_xdr; 2179 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1); 2180 if (!name) 2181 return nfserr_jukebox; 2182 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); 2183 2184 /* 2185 * Copy the extended attribute name over while checking for 0 2186 * characters. 2187 */ 2188 sp = (char *)p; 2189 dp = name + XATTR_USER_PREFIX_LEN; 2190 cnt = namelen; 2191 2192 while (cnt-- > 0) { 2193 if (*sp == '\0') 2194 return nfserr_bad_xdr; 2195 *dp++ = *sp++; 2196 } 2197 *dp = '\0'; 2198 2199 *namep = name; 2200 2201 return nfs_ok; 2202 } 2203 2204 /* 2205 * A GETXATTR op request comes without a length specifier. We just set the 2206 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum 2207 * channel reply size. nfsd_getxattr will probe the length of the xattr, 2208 * check it against getxa_len, and allocate + return the value. 2209 */ 2210 static __be32 2211 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp, 2212 union nfsd4_op_u *u) 2213 { 2214 struct nfsd4_getxattr *getxattr = &u->getxattr; 2215 __be32 status; 2216 u32 maxcount; 2217 2218 memset(getxattr, 0, sizeof(*getxattr)); 2219 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name); 2220 if (status) 2221 return status; 2222 2223 maxcount = svc_max_payload(argp->rqstp); 2224 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2225 2226 getxattr->getxa_len = maxcount; 2227 return nfs_ok; 2228 } 2229 2230 static __be32 2231 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp, 2232 union nfsd4_op_u *u) 2233 { 2234 struct nfsd4_setxattr *setxattr = &u->setxattr; 2235 u32 flags, maxcount, size; 2236 __be32 status; 2237 2238 memset(setxattr, 0, sizeof(*setxattr)); 2239 2240 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0) 2241 return nfserr_bad_xdr; 2242 2243 if (flags > SETXATTR4_REPLACE) 2244 return nfserr_inval; 2245 setxattr->setxa_flags = flags; 2246 2247 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name); 2248 if (status) 2249 return status; 2250 2251 maxcount = svc_max_payload(argp->rqstp); 2252 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2253 2254 if (xdr_stream_decode_u32(argp->xdr, &size) < 0) 2255 return nfserr_bad_xdr; 2256 if (size > maxcount) 2257 return nfserr_xattr2big; 2258 2259 setxattr->setxa_len = size; 2260 if (size > 0) { 2261 struct xdr_buf payload; 2262 2263 if (!xdr_stream_subsegment(argp->xdr, &payload, size)) 2264 return nfserr_bad_xdr; 2265 status = nfsd4_vbuf_from_vector(argp, &payload, 2266 &setxattr->setxa_buf, size); 2267 } 2268 2269 return nfs_ok; 2270 } 2271 2272 static __be32 2273 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp, 2274 union nfsd4_op_u *u) 2275 { 2276 struct nfsd4_listxattrs *listxattrs = &u->listxattrs; 2277 u32 maxcount; 2278 2279 memset(listxattrs, 0, sizeof(*listxattrs)); 2280 2281 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0) 2282 return nfserr_bad_xdr; 2283 2284 /* 2285 * If the cookie is too large to have even one user.x attribute 2286 * plus trailing '\0' left in a maximum size buffer, it's invalid. 2287 */ 2288 if (listxattrs->lsxa_cookie >= 2289 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2))) 2290 return nfserr_badcookie; 2291 2292 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0) 2293 return nfserr_bad_xdr; 2294 if (maxcount < 8) 2295 /* Always need at least 2 words (length and one character) */ 2296 return nfserr_inval; 2297 2298 maxcount = min(maxcount, svc_max_payload(argp->rqstp)); 2299 listxattrs->lsxa_maxcount = maxcount; 2300 2301 return nfs_ok; 2302 } 2303 2304 static __be32 2305 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp, 2306 union nfsd4_op_u *u) 2307 { 2308 struct nfsd4_removexattr *removexattr = &u->removexattr; 2309 memset(removexattr, 0, sizeof(*removexattr)); 2310 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name); 2311 } 2312 2313 static __be32 2314 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p) 2315 { 2316 return nfs_ok; 2317 } 2318 2319 static __be32 2320 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p) 2321 { 2322 return nfserr_notsupp; 2323 } 2324 2325 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u); 2326 2327 static const nfsd4_dec nfsd4_dec_ops[] = { 2328 [OP_ACCESS] = nfsd4_decode_access, 2329 [OP_CLOSE] = nfsd4_decode_close, 2330 [OP_COMMIT] = nfsd4_decode_commit, 2331 [OP_CREATE] = nfsd4_decode_create, 2332 [OP_DELEGPURGE] = nfsd4_decode_notsupp, 2333 [OP_DELEGRETURN] = nfsd4_decode_delegreturn, 2334 [OP_GETATTR] = nfsd4_decode_getattr, 2335 [OP_GETFH] = nfsd4_decode_noop, 2336 [OP_LINK] = nfsd4_decode_link, 2337 [OP_LOCK] = nfsd4_decode_lock, 2338 [OP_LOCKT] = nfsd4_decode_lockt, 2339 [OP_LOCKU] = nfsd4_decode_locku, 2340 [OP_LOOKUP] = nfsd4_decode_lookup, 2341 [OP_LOOKUPP] = nfsd4_decode_noop, 2342 [OP_NVERIFY] = nfsd4_decode_verify, 2343 [OP_OPEN] = nfsd4_decode_open, 2344 [OP_OPENATTR] = nfsd4_decode_notsupp, 2345 [OP_OPEN_CONFIRM] = nfsd4_decode_open_confirm, 2346 [OP_OPEN_DOWNGRADE] = nfsd4_decode_open_downgrade, 2347 [OP_PUTFH] = nfsd4_decode_putfh, 2348 [OP_PUTPUBFH] = nfsd4_decode_putpubfh, 2349 [OP_PUTROOTFH] = nfsd4_decode_noop, 2350 [OP_READ] = nfsd4_decode_read, 2351 [OP_READDIR] = nfsd4_decode_readdir, 2352 [OP_READLINK] = nfsd4_decode_noop, 2353 [OP_REMOVE] = nfsd4_decode_remove, 2354 [OP_RENAME] = nfsd4_decode_rename, 2355 [OP_RENEW] = nfsd4_decode_renew, 2356 [OP_RESTOREFH] = nfsd4_decode_noop, 2357 [OP_SAVEFH] = nfsd4_decode_noop, 2358 [OP_SECINFO] = nfsd4_decode_secinfo, 2359 [OP_SETATTR] = nfsd4_decode_setattr, 2360 [OP_SETCLIENTID] = nfsd4_decode_setclientid, 2361 [OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm, 2362 [OP_VERIFY] = nfsd4_decode_verify, 2363 [OP_WRITE] = nfsd4_decode_write, 2364 [OP_RELEASE_LOCKOWNER] = nfsd4_decode_release_lockowner, 2365 2366 /* new operations for NFSv4.1 */ 2367 [OP_BACKCHANNEL_CTL] = nfsd4_decode_backchannel_ctl, 2368 [OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session, 2369 [OP_EXCHANGE_ID] = nfsd4_decode_exchange_id, 2370 [OP_CREATE_SESSION] = nfsd4_decode_create_session, 2371 [OP_DESTROY_SESSION] = nfsd4_decode_destroy_session, 2372 [OP_FREE_STATEID] = nfsd4_decode_free_stateid, 2373 [OP_GET_DIR_DELEGATION] = nfsd4_decode_notsupp, 2374 #ifdef CONFIG_NFSD_PNFS 2375 [OP_GETDEVICEINFO] = nfsd4_decode_getdeviceinfo, 2376 [OP_GETDEVICELIST] = nfsd4_decode_notsupp, 2377 [OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit, 2378 [OP_LAYOUTGET] = nfsd4_decode_layoutget, 2379 [OP_LAYOUTRETURN] = nfsd4_decode_layoutreturn, 2380 #else 2381 [OP_GETDEVICEINFO] = nfsd4_decode_notsupp, 2382 [OP_GETDEVICELIST] = nfsd4_decode_notsupp, 2383 [OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp, 2384 [OP_LAYOUTGET] = nfsd4_decode_notsupp, 2385 [OP_LAYOUTRETURN] = nfsd4_decode_notsupp, 2386 #endif 2387 [OP_SECINFO_NO_NAME] = nfsd4_decode_secinfo_no_name, 2388 [OP_SEQUENCE] = nfsd4_decode_sequence, 2389 [OP_SET_SSV] = nfsd4_decode_notsupp, 2390 [OP_TEST_STATEID] = nfsd4_decode_test_stateid, 2391 [OP_WANT_DELEGATION] = nfsd4_decode_notsupp, 2392 [OP_DESTROY_CLIENTID] = nfsd4_decode_destroy_clientid, 2393 [OP_RECLAIM_COMPLETE] = nfsd4_decode_reclaim_complete, 2394 2395 /* new operations for NFSv4.2 */ 2396 [OP_ALLOCATE] = nfsd4_decode_fallocate, 2397 [OP_COPY] = nfsd4_decode_copy, 2398 [OP_COPY_NOTIFY] = nfsd4_decode_copy_notify, 2399 [OP_DEALLOCATE] = nfsd4_decode_fallocate, 2400 [OP_IO_ADVISE] = nfsd4_decode_notsupp, 2401 [OP_LAYOUTERROR] = nfsd4_decode_notsupp, 2402 [OP_LAYOUTSTATS] = nfsd4_decode_notsupp, 2403 [OP_OFFLOAD_CANCEL] = nfsd4_decode_offload_status, 2404 [OP_OFFLOAD_STATUS] = nfsd4_decode_offload_status, 2405 [OP_READ_PLUS] = nfsd4_decode_read, 2406 [OP_SEEK] = nfsd4_decode_seek, 2407 [OP_WRITE_SAME] = nfsd4_decode_notsupp, 2408 [OP_CLONE] = nfsd4_decode_clone, 2409 /* RFC 8276 extended atributes operations */ 2410 [OP_GETXATTR] = nfsd4_decode_getxattr, 2411 [OP_SETXATTR] = nfsd4_decode_setxattr, 2412 [OP_LISTXATTRS] = nfsd4_decode_listxattrs, 2413 [OP_REMOVEXATTR] = nfsd4_decode_removexattr, 2414 }; 2415 2416 static inline bool 2417 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op) 2418 { 2419 if (op->opnum < FIRST_NFS4_OP) 2420 return false; 2421 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP) 2422 return false; 2423 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP) 2424 return false; 2425 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP) 2426 return false; 2427 return true; 2428 } 2429 2430 static bool 2431 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 2432 { 2433 struct nfsd4_op *op; 2434 bool cachethis = false; 2435 int auth_slack= argp->rqstp->rq_auth_slack; 2436 int max_reply = auth_slack + 8; /* opcnt, status */ 2437 int readcount = 0; 2438 int readbytes = 0; 2439 __be32 *p; 2440 int i; 2441 2442 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0) 2443 return false; 2444 max_reply += XDR_UNIT; 2445 argp->tag = NULL; 2446 if (unlikely(argp->taglen)) { 2447 if (argp->taglen > NFSD4_MAX_TAGLEN) 2448 return false; 2449 p = xdr_inline_decode(argp->xdr, argp->taglen); 2450 if (!p) 2451 return false; 2452 argp->tag = svcxdr_savemem(argp, p, argp->taglen); 2453 if (!argp->tag) 2454 return false; 2455 max_reply += xdr_align_size(argp->taglen); 2456 } 2457 2458 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0) 2459 return false; 2460 if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0) 2461 return false; 2462 argp->opcnt = min_t(u32, argp->client_opcnt, 2463 NFSD_MAX_OPS_PER_COMPOUND); 2464 2465 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { 2466 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops)); 2467 if (!argp->ops) { 2468 argp->ops = argp->iops; 2469 return false; 2470 } 2471 } 2472 2473 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 2474 argp->opcnt = 0; 2475 2476 for (i = 0; i < argp->opcnt; i++) { 2477 op = &argp->ops[i]; 2478 op->replay = NULL; 2479 op->opdesc = NULL; 2480 2481 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0) 2482 return false; 2483 if (nfsd4_opnum_in_range(argp, op)) { 2484 op->opdesc = OPDESC(op); 2485 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u); 2486 if (op->status != nfs_ok) 2487 trace_nfsd_compound_decode_err(argp->rqstp, 2488 argp->opcnt, i, 2489 op->opnum, 2490 op->status); 2491 } else { 2492 op->opnum = OP_ILLEGAL; 2493 op->status = nfserr_op_illegal; 2494 } 2495 2496 /* 2497 * We'll try to cache the result in the DRC if any one 2498 * op in the compound wants to be cached: 2499 */ 2500 cachethis |= nfsd4_cache_this_op(op); 2501 2502 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) { 2503 readcount++; 2504 readbytes += nfsd4_max_reply(argp->rqstp, op); 2505 } else 2506 max_reply += nfsd4_max_reply(argp->rqstp, op); 2507 /* 2508 * OP_LOCK and OP_LOCKT may return a conflicting lock. 2509 * (Special case because it will just skip encoding this 2510 * if it runs out of xdr buffer space, and it is the only 2511 * operation that behaves this way.) 2512 */ 2513 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT) 2514 max_reply += NFS4_OPAQUE_LIMIT; 2515 2516 if (op->status) { 2517 argp->opcnt = i+1; 2518 break; 2519 } 2520 } 2521 /* Sessions make the DRC unnecessary: */ 2522 if (argp->minorversion) 2523 cachethis = false; 2524 svc_reserve(argp->rqstp, max_reply + readbytes); 2525 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE; 2526 2527 argp->splice_ok = nfsd_read_splice_ok(argp->rqstp); 2528 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack) 2529 argp->splice_ok = false; 2530 2531 return true; 2532 } 2533 2534 static __be32 nfsd4_encode_nfs_fh4(struct xdr_stream *xdr, 2535 struct knfsd_fh *fh_handle) 2536 { 2537 return nfsd4_encode_opaque(xdr, fh_handle->fh_raw, fh_handle->fh_size); 2538 } 2539 2540 /* This is a frequently-encoded type; open-coded for speed */ 2541 static __be32 nfsd4_encode_nfstime4(struct xdr_stream *xdr, 2542 const struct timespec64 *tv) 2543 { 2544 __be32 *p; 2545 2546 p = xdr_reserve_space(xdr, XDR_UNIT * 3); 2547 if (!p) 2548 return nfserr_resource; 2549 p = xdr_encode_hyper(p, tv->tv_sec); 2550 *p = cpu_to_be32(tv->tv_nsec); 2551 return nfs_ok; 2552 } 2553 2554 static __be32 nfsd4_encode_specdata4(struct xdr_stream *xdr, 2555 unsigned int major, unsigned int minor) 2556 { 2557 __be32 status; 2558 2559 status = nfsd4_encode_uint32_t(xdr, major); 2560 if (status != nfs_ok) 2561 return status; 2562 return nfsd4_encode_uint32_t(xdr, minor); 2563 } 2564 2565 static __be32 2566 nfsd4_encode_change_info4(struct xdr_stream *xdr, const struct nfsd4_change_info *c) 2567 { 2568 __be32 status; 2569 2570 status = nfsd4_encode_bool(xdr, c->atomic); 2571 if (status != nfs_ok) 2572 return status; 2573 status = nfsd4_encode_changeid4(xdr, c->before_change); 2574 if (status != nfs_ok) 2575 return status; 2576 return nfsd4_encode_changeid4(xdr, c->after_change); 2577 } 2578 2579 static __be32 nfsd4_encode_netaddr4(struct xdr_stream *xdr, 2580 const struct nfs42_netaddr *addr) 2581 { 2582 __be32 status; 2583 2584 /* na_r_netid */ 2585 status = nfsd4_encode_opaque(xdr, addr->netid, addr->netid_len); 2586 if (status != nfs_ok) 2587 return status; 2588 /* na_r_addr */ 2589 return nfsd4_encode_opaque(xdr, addr->addr, addr->addr_len); 2590 } 2591 2592 /* Encode as an array of strings the string given with components 2593 * separated @sep, escaped with esc_enter and esc_exit. 2594 */ 2595 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep, 2596 char *components, char esc_enter, 2597 char esc_exit) 2598 { 2599 __be32 *p; 2600 __be32 pathlen; 2601 int pathlen_offset; 2602 int strlen, count=0; 2603 char *str, *end, *next; 2604 2605 dprintk("nfsd4_encode_components(%s)\n", components); 2606 2607 pathlen_offset = xdr->buf->len; 2608 p = xdr_reserve_space(xdr, 4); 2609 if (!p) 2610 return nfserr_resource; 2611 p++; /* We will fill this in with @count later */ 2612 2613 end = str = components; 2614 while (*end) { 2615 bool found_esc = false; 2616 2617 /* try to parse as esc_start, ..., esc_end, sep */ 2618 if (*str == esc_enter) { 2619 for (; *end && (*end != esc_exit); end++) 2620 /* find esc_exit or end of string */; 2621 next = end + 1; 2622 if (*end && (!*next || *next == sep)) { 2623 str++; 2624 found_esc = true; 2625 } 2626 } 2627 2628 if (!found_esc) 2629 for (; *end && (*end != sep); end++) 2630 /* find sep or end of string */; 2631 2632 strlen = end - str; 2633 if (strlen) { 2634 p = xdr_reserve_space(xdr, strlen + 4); 2635 if (!p) 2636 return nfserr_resource; 2637 p = xdr_encode_opaque(p, str, strlen); 2638 count++; 2639 } 2640 else 2641 end++; 2642 if (found_esc) 2643 end = next; 2644 2645 str = end; 2646 } 2647 pathlen = htonl(count); 2648 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4); 2649 return 0; 2650 } 2651 2652 /* Encode as an array of strings the string given with components 2653 * separated @sep. 2654 */ 2655 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep, 2656 char *components) 2657 { 2658 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0); 2659 } 2660 2661 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr, 2662 struct nfsd4_fs_location *location) 2663 { 2664 __be32 status; 2665 2666 status = nfsd4_encode_components_esc(xdr, ':', location->hosts, 2667 '[', ']'); 2668 if (status) 2669 return status; 2670 status = nfsd4_encode_components(xdr, '/', location->path); 2671 if (status) 2672 return status; 2673 return nfs_ok; 2674 } 2675 2676 static __be32 nfsd4_encode_pathname4(struct xdr_stream *xdr, 2677 const struct path *root, 2678 const struct path *path) 2679 { 2680 struct path cur = *path; 2681 __be32 *p; 2682 struct dentry **components = NULL; 2683 unsigned int ncomponents = 0; 2684 __be32 err = nfserr_jukebox; 2685 2686 dprintk("nfsd4_encode_components("); 2687 2688 path_get(&cur); 2689 /* First walk the path up to the nfsd root, and store the 2690 * dentries/path components in an array. 2691 */ 2692 for (;;) { 2693 if (path_equal(&cur, root)) 2694 break; 2695 if (cur.dentry == cur.mnt->mnt_root) { 2696 if (follow_up(&cur)) 2697 continue; 2698 goto out_free; 2699 } 2700 if ((ncomponents & 15) == 0) { 2701 struct dentry **new; 2702 new = krealloc(components, 2703 sizeof(*new) * (ncomponents + 16), 2704 GFP_KERNEL); 2705 if (!new) 2706 goto out_free; 2707 components = new; 2708 } 2709 components[ncomponents++] = cur.dentry; 2710 cur.dentry = dget_parent(cur.dentry); 2711 } 2712 err = nfserr_resource; 2713 p = xdr_reserve_space(xdr, 4); 2714 if (!p) 2715 goto out_free; 2716 *p++ = cpu_to_be32(ncomponents); 2717 2718 while (ncomponents) { 2719 struct dentry *dentry = components[ncomponents - 1]; 2720 unsigned int len; 2721 2722 spin_lock(&dentry->d_lock); 2723 len = dentry->d_name.len; 2724 p = xdr_reserve_space(xdr, len + 4); 2725 if (!p) { 2726 spin_unlock(&dentry->d_lock); 2727 goto out_free; 2728 } 2729 p = xdr_encode_opaque(p, dentry->d_name.name, len); 2730 dprintk("/%pd", dentry); 2731 spin_unlock(&dentry->d_lock); 2732 dput(dentry); 2733 ncomponents--; 2734 } 2735 2736 err = 0; 2737 out_free: 2738 dprintk(")\n"); 2739 while (ncomponents) 2740 dput(components[--ncomponents]); 2741 kfree(components); 2742 path_put(&cur); 2743 return err; 2744 } 2745 2746 static __be32 nfsd4_encode_fs_locations4(struct xdr_stream *xdr, 2747 struct svc_rqst *rqstp, 2748 struct svc_export *exp) 2749 { 2750 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; 2751 struct svc_export *exp_ps; 2752 unsigned int i; 2753 __be32 status; 2754 2755 /* fs_root */ 2756 exp_ps = rqst_find_fsidzero_export(rqstp); 2757 if (IS_ERR(exp_ps)) 2758 return nfserrno(PTR_ERR(exp_ps)); 2759 status = nfsd4_encode_pathname4(xdr, &exp_ps->ex_path, &exp->ex_path); 2760 exp_put(exp_ps); 2761 if (status != nfs_ok) 2762 return status; 2763 2764 /* locations<> */ 2765 if (xdr_stream_encode_u32(xdr, fslocs->locations_count) != XDR_UNIT) 2766 return nfserr_resource; 2767 for (i = 0; i < fslocs->locations_count; i++) { 2768 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]); 2769 if (status != nfs_ok) 2770 return status; 2771 } 2772 2773 return nfs_ok; 2774 } 2775 2776 static __be32 nfsd4_encode_nfsace4(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2777 struct nfs4_ace *ace) 2778 { 2779 __be32 status; 2780 2781 /* type */ 2782 status = nfsd4_encode_acetype4(xdr, ace->type); 2783 if (status != nfs_ok) 2784 return nfserr_resource; 2785 /* flag */ 2786 status = nfsd4_encode_aceflag4(xdr, ace->flag); 2787 if (status != nfs_ok) 2788 return nfserr_resource; 2789 /* access mask */ 2790 status = nfsd4_encode_acemask4(xdr, ace->access_mask & NFS4_ACE_MASK_ALL); 2791 if (status != nfs_ok) 2792 return nfserr_resource; 2793 /* who */ 2794 if (ace->whotype != NFS4_ACL_WHO_NAMED) 2795 return nfs4_acl_write_who(xdr, ace->whotype); 2796 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 2797 return nfsd4_encode_group(xdr, rqstp, ace->who_gid); 2798 return nfsd4_encode_user(xdr, rqstp, ace->who_uid); 2799 } 2800 2801 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ 2802 FATTR4_WORD0_RDATTR_ERROR) 2803 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID 2804 #define WORD2_ABSENT_FS_ATTRS 0 2805 2806 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2807 static inline __be32 2808 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2809 void *context, int len) 2810 { 2811 __be32 *p; 2812 2813 p = xdr_reserve_space(xdr, len + 4 + 4 + 4); 2814 if (!p) 2815 return nfserr_resource; 2816 2817 /* 2818 * For now we use a 0 here to indicate the null translation; in 2819 * the future we may place a call to translation code here. 2820 */ 2821 *p++ = cpu_to_be32(0); /* lfs */ 2822 *p++ = cpu_to_be32(0); /* pi */ 2823 p = xdr_encode_opaque(p, context, len); 2824 return 0; 2825 } 2826 #else 2827 static inline __be32 2828 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2829 void *context, int len) 2830 { return 0; } 2831 #endif 2832 2833 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err) 2834 { 2835 /* As per referral draft: */ 2836 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || 2837 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { 2838 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || 2839 *bmval0 & FATTR4_WORD0_FS_LOCATIONS) 2840 *rdattr_err = NFSERR_MOVED; 2841 else 2842 return nfserr_moved; 2843 } 2844 *bmval0 &= WORD0_ABSENT_FS_ATTRS; 2845 *bmval1 &= WORD1_ABSENT_FS_ATTRS; 2846 *bmval2 &= WORD2_ABSENT_FS_ATTRS; 2847 return 0; 2848 } 2849 2850 2851 static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino) 2852 { 2853 struct path path = exp->ex_path; 2854 struct kstat stat; 2855 int err; 2856 2857 path_get(&path); 2858 while (follow_up(&path)) { 2859 if (path.dentry != path.mnt->mnt_root) 2860 break; 2861 } 2862 err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT); 2863 path_put(&path); 2864 if (!err) 2865 *pino = stat.ino; 2866 return err; 2867 } 2868 2869 static __be32 2870 nfsd4_encode_bitmap4(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2) 2871 { 2872 __be32 *p; 2873 2874 if (bmval2) { 2875 p = xdr_reserve_space(xdr, XDR_UNIT * 4); 2876 if (!p) 2877 goto out_resource; 2878 *p++ = cpu_to_be32(3); 2879 *p++ = cpu_to_be32(bmval0); 2880 *p++ = cpu_to_be32(bmval1); 2881 *p++ = cpu_to_be32(bmval2); 2882 } else if (bmval1) { 2883 p = xdr_reserve_space(xdr, XDR_UNIT * 3); 2884 if (!p) 2885 goto out_resource; 2886 *p++ = cpu_to_be32(2); 2887 *p++ = cpu_to_be32(bmval0); 2888 *p++ = cpu_to_be32(bmval1); 2889 } else { 2890 p = xdr_reserve_space(xdr, XDR_UNIT * 2); 2891 if (!p) 2892 goto out_resource; 2893 *p++ = cpu_to_be32(1); 2894 *p++ = cpu_to_be32(bmval0); 2895 } 2896 2897 return nfs_ok; 2898 out_resource: 2899 return nfserr_resource; 2900 } 2901 2902 struct nfsd4_fattr_args { 2903 struct svc_rqst *rqstp; 2904 struct svc_fh *fhp; 2905 struct svc_export *exp; 2906 struct dentry *dentry; 2907 struct kstat stat; 2908 struct kstatfs statfs; 2909 struct nfs4_acl *acl; 2910 u64 size; 2911 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2912 void *context; 2913 int contextlen; 2914 #endif 2915 u32 rdattr_err; 2916 bool contextsupport; 2917 bool ignore_crossmnt; 2918 }; 2919 2920 typedef __be32(*nfsd4_enc_attr)(struct xdr_stream *xdr, 2921 const struct nfsd4_fattr_args *args); 2922 2923 static __be32 nfsd4_encode_fattr4__noop(struct xdr_stream *xdr, 2924 const struct nfsd4_fattr_args *args) 2925 { 2926 return nfs_ok; 2927 } 2928 2929 static __be32 nfsd4_encode_fattr4__true(struct xdr_stream *xdr, 2930 const struct nfsd4_fattr_args *args) 2931 { 2932 return nfsd4_encode_bool(xdr, true); 2933 } 2934 2935 static __be32 nfsd4_encode_fattr4__false(struct xdr_stream *xdr, 2936 const struct nfsd4_fattr_args *args) 2937 { 2938 return nfsd4_encode_bool(xdr, false); 2939 } 2940 2941 static __be32 nfsd4_encode_fattr4_supported_attrs(struct xdr_stream *xdr, 2942 const struct nfsd4_fattr_args *args) 2943 { 2944 struct nfsd4_compoundres *resp = args->rqstp->rq_resp; 2945 u32 minorversion = resp->cstate.minorversion; 2946 u32 supp[3]; 2947 2948 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2949 if (!IS_POSIXACL(d_inode(args->dentry))) 2950 supp[0] &= ~FATTR4_WORD0_ACL; 2951 if (!args->contextsupport) 2952 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2953 2954 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]); 2955 } 2956 2957 static __be32 nfsd4_encode_fattr4_type(struct xdr_stream *xdr, 2958 const struct nfsd4_fattr_args *args) 2959 { 2960 __be32 *p; 2961 2962 p = xdr_reserve_space(xdr, XDR_UNIT); 2963 if (!p) 2964 return nfserr_resource; 2965 2966 switch (args->stat.mode & S_IFMT) { 2967 case S_IFIFO: 2968 *p = cpu_to_be32(NF4FIFO); 2969 break; 2970 case S_IFCHR: 2971 *p = cpu_to_be32(NF4CHR); 2972 break; 2973 case S_IFDIR: 2974 *p = cpu_to_be32(NF4DIR); 2975 break; 2976 case S_IFBLK: 2977 *p = cpu_to_be32(NF4BLK); 2978 break; 2979 case S_IFLNK: 2980 *p = cpu_to_be32(NF4LNK); 2981 break; 2982 case S_IFREG: 2983 *p = cpu_to_be32(NF4REG); 2984 break; 2985 case S_IFSOCK: 2986 *p = cpu_to_be32(NF4SOCK); 2987 break; 2988 default: 2989 return nfserr_serverfault; 2990 } 2991 2992 return nfs_ok; 2993 } 2994 2995 static __be32 nfsd4_encode_fattr4_fh_expire_type(struct xdr_stream *xdr, 2996 const struct nfsd4_fattr_args *args) 2997 { 2998 u32 mask; 2999 3000 mask = NFS4_FH_PERSISTENT; 3001 if (!(args->exp->ex_flags & NFSEXP_NOSUBTREECHECK)) 3002 mask |= NFS4_FH_VOL_RENAME; 3003 return nfsd4_encode_uint32_t(xdr, mask); 3004 } 3005 3006 static __be32 nfsd4_encode_fattr4_change(struct xdr_stream *xdr, 3007 const struct nfsd4_fattr_args *args) 3008 { 3009 const struct svc_export *exp = args->exp; 3010 u64 c; 3011 3012 if (unlikely(exp->ex_flags & NFSEXP_V4ROOT)) { 3013 u32 flush_time = convert_to_wallclock(exp->cd->flush_time); 3014 3015 if (xdr_stream_encode_u32(xdr, flush_time) != XDR_UNIT) 3016 return nfserr_resource; 3017 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT) 3018 return nfserr_resource; 3019 return nfs_ok; 3020 } 3021 3022 c = nfsd4_change_attribute(&args->stat, d_inode(args->dentry)); 3023 return nfsd4_encode_changeid4(xdr, c); 3024 } 3025 3026 static __be32 nfsd4_encode_fattr4_size(struct xdr_stream *xdr, 3027 const struct nfsd4_fattr_args *args) 3028 { 3029 return nfsd4_encode_uint64_t(xdr, args->size); 3030 } 3031 3032 static __be32 nfsd4_encode_fattr4_fsid(struct xdr_stream *xdr, 3033 const struct nfsd4_fattr_args *args) 3034 { 3035 __be32 *p; 3036 3037 p = xdr_reserve_space(xdr, XDR_UNIT * 2 + XDR_UNIT * 2); 3038 if (!p) 3039 return nfserr_resource; 3040 3041 if (unlikely(args->exp->ex_fslocs.migrated)) { 3042 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR); 3043 xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR); 3044 return nfs_ok; 3045 } 3046 switch (fsid_source(args->fhp)) { 3047 case FSIDSOURCE_FSID: 3048 p = xdr_encode_hyper(p, (u64)args->exp->ex_fsid); 3049 xdr_encode_hyper(p, (u64)0); 3050 break; 3051 case FSIDSOURCE_DEV: 3052 *p++ = xdr_zero; 3053 *p++ = cpu_to_be32(MAJOR(args->stat.dev)); 3054 *p++ = xdr_zero; 3055 *p = cpu_to_be32(MINOR(args->stat.dev)); 3056 break; 3057 case FSIDSOURCE_UUID: 3058 xdr_encode_opaque_fixed(p, args->exp->ex_uuid, EX_UUID_LEN); 3059 break; 3060 } 3061 3062 return nfs_ok; 3063 } 3064 3065 static __be32 nfsd4_encode_fattr4_lease_time(struct xdr_stream *xdr, 3066 const struct nfsd4_fattr_args *args) 3067 { 3068 struct nfsd_net *nn = net_generic(SVC_NET(args->rqstp), nfsd_net_id); 3069 3070 return nfsd4_encode_nfs_lease4(xdr, nn->nfsd4_lease); 3071 } 3072 3073 static __be32 nfsd4_encode_fattr4_rdattr_error(struct xdr_stream *xdr, 3074 const struct nfsd4_fattr_args *args) 3075 { 3076 return nfsd4_encode_uint32_t(xdr, args->rdattr_err); 3077 } 3078 3079 static __be32 nfsd4_encode_fattr4_aclsupport(struct xdr_stream *xdr, 3080 const struct nfsd4_fattr_args *args) 3081 { 3082 u32 mask; 3083 3084 mask = 0; 3085 if (IS_POSIXACL(d_inode(args->dentry))) 3086 mask = ACL4_SUPPORT_ALLOW_ACL | ACL4_SUPPORT_DENY_ACL; 3087 return nfsd4_encode_uint32_t(xdr, mask); 3088 } 3089 3090 static __be32 nfsd4_encode_fattr4_acl(struct xdr_stream *xdr, 3091 const struct nfsd4_fattr_args *args) 3092 { 3093 struct nfs4_acl *acl = args->acl; 3094 struct nfs4_ace *ace; 3095 __be32 status; 3096 3097 /* nfsace4<> */ 3098 if (!acl) { 3099 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT) 3100 return nfserr_resource; 3101 } else { 3102 if (xdr_stream_encode_u32(xdr, acl->naces) != XDR_UNIT) 3103 return nfserr_resource; 3104 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 3105 status = nfsd4_encode_nfsace4(xdr, args->rqstp, ace); 3106 if (status != nfs_ok) 3107 return status; 3108 } 3109 } 3110 return nfs_ok; 3111 } 3112 3113 static __be32 nfsd4_encode_fattr4_filehandle(struct xdr_stream *xdr, 3114 const struct nfsd4_fattr_args *args) 3115 { 3116 return nfsd4_encode_nfs_fh4(xdr, &args->fhp->fh_handle); 3117 } 3118 3119 static __be32 nfsd4_encode_fattr4_fileid(struct xdr_stream *xdr, 3120 const struct nfsd4_fattr_args *args) 3121 { 3122 return nfsd4_encode_uint64_t(xdr, args->stat.ino); 3123 } 3124 3125 static __be32 nfsd4_encode_fattr4_files_avail(struct xdr_stream *xdr, 3126 const struct nfsd4_fattr_args *args) 3127 { 3128 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree); 3129 } 3130 3131 static __be32 nfsd4_encode_fattr4_files_free(struct xdr_stream *xdr, 3132 const struct nfsd4_fattr_args *args) 3133 { 3134 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree); 3135 } 3136 3137 static __be32 nfsd4_encode_fattr4_files_total(struct xdr_stream *xdr, 3138 const struct nfsd4_fattr_args *args) 3139 { 3140 return nfsd4_encode_uint64_t(xdr, args->statfs.f_files); 3141 } 3142 3143 static __be32 nfsd4_encode_fattr4_fs_locations(struct xdr_stream *xdr, 3144 const struct nfsd4_fattr_args *args) 3145 { 3146 return nfsd4_encode_fs_locations4(xdr, args->rqstp, args->exp); 3147 } 3148 3149 static __be32 nfsd4_encode_fattr4_maxfilesize(struct xdr_stream *xdr, 3150 const struct nfsd4_fattr_args *args) 3151 { 3152 struct super_block *sb = args->exp->ex_path.mnt->mnt_sb; 3153 3154 return nfsd4_encode_uint64_t(xdr, sb->s_maxbytes); 3155 } 3156 3157 static __be32 nfsd4_encode_fattr4_maxlink(struct xdr_stream *xdr, 3158 const struct nfsd4_fattr_args *args) 3159 { 3160 return nfsd4_encode_uint32_t(xdr, 255); 3161 } 3162 3163 static __be32 nfsd4_encode_fattr4_maxname(struct xdr_stream *xdr, 3164 const struct nfsd4_fattr_args *args) 3165 { 3166 return nfsd4_encode_uint32_t(xdr, args->statfs.f_namelen); 3167 } 3168 3169 static __be32 nfsd4_encode_fattr4_maxread(struct xdr_stream *xdr, 3170 const struct nfsd4_fattr_args *args) 3171 { 3172 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp)); 3173 } 3174 3175 static __be32 nfsd4_encode_fattr4_maxwrite(struct xdr_stream *xdr, 3176 const struct nfsd4_fattr_args *args) 3177 { 3178 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp)); 3179 } 3180 3181 static __be32 nfsd4_encode_fattr4_mode(struct xdr_stream *xdr, 3182 const struct nfsd4_fattr_args *args) 3183 { 3184 return nfsd4_encode_mode4(xdr, args->stat.mode & S_IALLUGO); 3185 } 3186 3187 static __be32 nfsd4_encode_fattr4_numlinks(struct xdr_stream *xdr, 3188 const struct nfsd4_fattr_args *args) 3189 { 3190 return nfsd4_encode_uint32_t(xdr, args->stat.nlink); 3191 } 3192 3193 static __be32 nfsd4_encode_fattr4_owner(struct xdr_stream *xdr, 3194 const struct nfsd4_fattr_args *args) 3195 { 3196 return nfsd4_encode_user(xdr, args->rqstp, args->stat.uid); 3197 } 3198 3199 static __be32 nfsd4_encode_fattr4_owner_group(struct xdr_stream *xdr, 3200 const struct nfsd4_fattr_args *args) 3201 { 3202 return nfsd4_encode_group(xdr, args->rqstp, args->stat.gid); 3203 } 3204 3205 static __be32 nfsd4_encode_fattr4_rawdev(struct xdr_stream *xdr, 3206 const struct nfsd4_fattr_args *args) 3207 { 3208 return nfsd4_encode_specdata4(xdr, MAJOR(args->stat.rdev), 3209 MINOR(args->stat.rdev)); 3210 } 3211 3212 static __be32 nfsd4_encode_fattr4_space_avail(struct xdr_stream *xdr, 3213 const struct nfsd4_fattr_args *args) 3214 { 3215 u64 avail = (u64)args->statfs.f_bavail * (u64)args->statfs.f_bsize; 3216 3217 return nfsd4_encode_uint64_t(xdr, avail); 3218 } 3219 3220 static __be32 nfsd4_encode_fattr4_space_free(struct xdr_stream *xdr, 3221 const struct nfsd4_fattr_args *args) 3222 { 3223 u64 free = (u64)args->statfs.f_bfree * (u64)args->statfs.f_bsize; 3224 3225 return nfsd4_encode_uint64_t(xdr, free); 3226 } 3227 3228 static __be32 nfsd4_encode_fattr4_space_total(struct xdr_stream *xdr, 3229 const struct nfsd4_fattr_args *args) 3230 { 3231 u64 total = (u64)args->statfs.f_blocks * (u64)args->statfs.f_bsize; 3232 3233 return nfsd4_encode_uint64_t(xdr, total); 3234 } 3235 3236 static __be32 nfsd4_encode_fattr4_space_used(struct xdr_stream *xdr, 3237 const struct nfsd4_fattr_args *args) 3238 { 3239 return nfsd4_encode_uint64_t(xdr, (u64)args->stat.blocks << 9); 3240 } 3241 3242 static __be32 nfsd4_encode_fattr4_time_access(struct xdr_stream *xdr, 3243 const struct nfsd4_fattr_args *args) 3244 { 3245 return nfsd4_encode_nfstime4(xdr, &args->stat.atime); 3246 } 3247 3248 static __be32 nfsd4_encode_fattr4_time_create(struct xdr_stream *xdr, 3249 const struct nfsd4_fattr_args *args) 3250 { 3251 return nfsd4_encode_nfstime4(xdr, &args->stat.btime); 3252 } 3253 3254 /* 3255 * ctime (in NFSv4, time_metadata) is not writeable, and the client 3256 * doesn't really care what resolution could theoretically be stored by 3257 * the filesystem. 3258 * 3259 * The client cares how close together changes can be while still 3260 * guaranteeing ctime changes. For most filesystems (which have 3261 * timestamps with nanosecond fields) that is limited by the resolution 3262 * of the time returned from current_time() (which I'm assuming to be 3263 * 1/HZ). 3264 */ 3265 static __be32 nfsd4_encode_fattr4_time_delta(struct xdr_stream *xdr, 3266 const struct nfsd4_fattr_args *args) 3267 { 3268 const struct inode *inode = d_inode(args->dentry); 3269 u32 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran); 3270 struct timespec64 ts = ns_to_timespec64(ns); 3271 3272 return nfsd4_encode_nfstime4(xdr, &ts); 3273 } 3274 3275 static __be32 nfsd4_encode_fattr4_time_metadata(struct xdr_stream *xdr, 3276 const struct nfsd4_fattr_args *args) 3277 { 3278 return nfsd4_encode_nfstime4(xdr, &args->stat.ctime); 3279 } 3280 3281 static __be32 nfsd4_encode_fattr4_time_modify(struct xdr_stream *xdr, 3282 const struct nfsd4_fattr_args *args) 3283 { 3284 return nfsd4_encode_nfstime4(xdr, &args->stat.mtime); 3285 } 3286 3287 static __be32 nfsd4_encode_fattr4_mounted_on_fileid(struct xdr_stream *xdr, 3288 const struct nfsd4_fattr_args *args) 3289 { 3290 u64 ino; 3291 int err; 3292 3293 if (!args->ignore_crossmnt && 3294 args->dentry == args->exp->ex_path.mnt->mnt_root) { 3295 err = nfsd4_get_mounted_on_ino(args->exp, &ino); 3296 if (err) 3297 return nfserrno(err); 3298 } else 3299 ino = args->stat.ino; 3300 3301 return nfsd4_encode_uint64_t(xdr, ino); 3302 } 3303 3304 #ifdef CONFIG_NFSD_PNFS 3305 3306 static __be32 nfsd4_encode_fattr4_fs_layout_types(struct xdr_stream *xdr, 3307 const struct nfsd4_fattr_args *args) 3308 { 3309 unsigned long mask = args->exp->ex_layout_types; 3310 int i; 3311 3312 /* Hamming weight of @mask is the number of layout types to return */ 3313 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT) 3314 return nfserr_resource; 3315 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 3316 if (mask & BIT(i)) { 3317 /* layouttype4 */ 3318 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT) 3319 return nfserr_resource; 3320 } 3321 return nfs_ok; 3322 } 3323 3324 static __be32 nfsd4_encode_fattr4_layout_types(struct xdr_stream *xdr, 3325 const struct nfsd4_fattr_args *args) 3326 { 3327 unsigned long mask = args->exp->ex_layout_types; 3328 int i; 3329 3330 /* Hamming weight of @mask is the number of layout types to return */ 3331 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT) 3332 return nfserr_resource; 3333 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 3334 if (mask & BIT(i)) { 3335 /* layouttype4 */ 3336 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT) 3337 return nfserr_resource; 3338 } 3339 return nfs_ok; 3340 } 3341 3342 static __be32 nfsd4_encode_fattr4_layout_blksize(struct xdr_stream *xdr, 3343 const struct nfsd4_fattr_args *args) 3344 { 3345 return nfsd4_encode_uint32_t(xdr, args->stat.blksize); 3346 } 3347 3348 #endif 3349 3350 static __be32 nfsd4_encode_fattr4_suppattr_exclcreat(struct xdr_stream *xdr, 3351 const struct nfsd4_fattr_args *args) 3352 { 3353 struct nfsd4_compoundres *resp = args->rqstp->rq_resp; 3354 u32 supp[3]; 3355 3356 memcpy(supp, nfsd_suppattrs[resp->cstate.minorversion], sizeof(supp)); 3357 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0; 3358 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1; 3359 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2; 3360 3361 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]); 3362 } 3363 3364 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3365 static __be32 nfsd4_encode_fattr4_sec_label(struct xdr_stream *xdr, 3366 const struct nfsd4_fattr_args *args) 3367 { 3368 return nfsd4_encode_security_label(xdr, args->rqstp, 3369 args->context, args->contextlen); 3370 } 3371 #endif 3372 3373 static __be32 nfsd4_encode_fattr4_xattr_support(struct xdr_stream *xdr, 3374 const struct nfsd4_fattr_args *args) 3375 { 3376 int err = xattr_supports_user_prefix(d_inode(args->dentry)); 3377 3378 return nfsd4_encode_bool(xdr, err == 0); 3379 } 3380 3381 static const nfsd4_enc_attr nfsd4_enc_fattr4_encode_ops[] = { 3382 [FATTR4_SUPPORTED_ATTRS] = nfsd4_encode_fattr4_supported_attrs, 3383 [FATTR4_TYPE] = nfsd4_encode_fattr4_type, 3384 [FATTR4_FH_EXPIRE_TYPE] = nfsd4_encode_fattr4_fh_expire_type, 3385 [FATTR4_CHANGE] = nfsd4_encode_fattr4_change, 3386 [FATTR4_SIZE] = nfsd4_encode_fattr4_size, 3387 [FATTR4_LINK_SUPPORT] = nfsd4_encode_fattr4__true, 3388 [FATTR4_SYMLINK_SUPPORT] = nfsd4_encode_fattr4__true, 3389 [FATTR4_NAMED_ATTR] = nfsd4_encode_fattr4__false, 3390 [FATTR4_FSID] = nfsd4_encode_fattr4_fsid, 3391 [FATTR4_UNIQUE_HANDLES] = nfsd4_encode_fattr4__true, 3392 [FATTR4_LEASE_TIME] = nfsd4_encode_fattr4_lease_time, 3393 [FATTR4_RDATTR_ERROR] = nfsd4_encode_fattr4_rdattr_error, 3394 [FATTR4_ACL] = nfsd4_encode_fattr4_acl, 3395 [FATTR4_ACLSUPPORT] = nfsd4_encode_fattr4_aclsupport, 3396 [FATTR4_ARCHIVE] = nfsd4_encode_fattr4__noop, 3397 [FATTR4_CANSETTIME] = nfsd4_encode_fattr4__true, 3398 [FATTR4_CASE_INSENSITIVE] = nfsd4_encode_fattr4__false, 3399 [FATTR4_CASE_PRESERVING] = nfsd4_encode_fattr4__true, 3400 [FATTR4_CHOWN_RESTRICTED] = nfsd4_encode_fattr4__true, 3401 [FATTR4_FILEHANDLE] = nfsd4_encode_fattr4_filehandle, 3402 [FATTR4_FILEID] = nfsd4_encode_fattr4_fileid, 3403 [FATTR4_FILES_AVAIL] = nfsd4_encode_fattr4_files_avail, 3404 [FATTR4_FILES_FREE] = nfsd4_encode_fattr4_files_free, 3405 [FATTR4_FILES_TOTAL] = nfsd4_encode_fattr4_files_total, 3406 [FATTR4_FS_LOCATIONS] = nfsd4_encode_fattr4_fs_locations, 3407 [FATTR4_HIDDEN] = nfsd4_encode_fattr4__noop, 3408 [FATTR4_HOMOGENEOUS] = nfsd4_encode_fattr4__true, 3409 [FATTR4_MAXFILESIZE] = nfsd4_encode_fattr4_maxfilesize, 3410 [FATTR4_MAXLINK] = nfsd4_encode_fattr4_maxlink, 3411 [FATTR4_MAXNAME] = nfsd4_encode_fattr4_maxname, 3412 [FATTR4_MAXREAD] = nfsd4_encode_fattr4_maxread, 3413 [FATTR4_MAXWRITE] = nfsd4_encode_fattr4_maxwrite, 3414 [FATTR4_MIMETYPE] = nfsd4_encode_fattr4__noop, 3415 [FATTR4_MODE] = nfsd4_encode_fattr4_mode, 3416 [FATTR4_NO_TRUNC] = nfsd4_encode_fattr4__true, 3417 [FATTR4_NUMLINKS] = nfsd4_encode_fattr4_numlinks, 3418 [FATTR4_OWNER] = nfsd4_encode_fattr4_owner, 3419 [FATTR4_OWNER_GROUP] = nfsd4_encode_fattr4_owner_group, 3420 [FATTR4_QUOTA_AVAIL_HARD] = nfsd4_encode_fattr4__noop, 3421 [FATTR4_QUOTA_AVAIL_SOFT] = nfsd4_encode_fattr4__noop, 3422 [FATTR4_QUOTA_USED] = nfsd4_encode_fattr4__noop, 3423 [FATTR4_RAWDEV] = nfsd4_encode_fattr4_rawdev, 3424 [FATTR4_SPACE_AVAIL] = nfsd4_encode_fattr4_space_avail, 3425 [FATTR4_SPACE_FREE] = nfsd4_encode_fattr4_space_free, 3426 [FATTR4_SPACE_TOTAL] = nfsd4_encode_fattr4_space_total, 3427 [FATTR4_SPACE_USED] = nfsd4_encode_fattr4_space_used, 3428 [FATTR4_SYSTEM] = nfsd4_encode_fattr4__noop, 3429 [FATTR4_TIME_ACCESS] = nfsd4_encode_fattr4_time_access, 3430 [FATTR4_TIME_ACCESS_SET] = nfsd4_encode_fattr4__noop, 3431 [FATTR4_TIME_BACKUP] = nfsd4_encode_fattr4__noop, 3432 [FATTR4_TIME_CREATE] = nfsd4_encode_fattr4_time_create, 3433 [FATTR4_TIME_DELTA] = nfsd4_encode_fattr4_time_delta, 3434 [FATTR4_TIME_METADATA] = nfsd4_encode_fattr4_time_metadata, 3435 [FATTR4_TIME_MODIFY] = nfsd4_encode_fattr4_time_modify, 3436 [FATTR4_TIME_MODIFY_SET] = nfsd4_encode_fattr4__noop, 3437 [FATTR4_MOUNTED_ON_FILEID] = nfsd4_encode_fattr4_mounted_on_fileid, 3438 [FATTR4_DIR_NOTIF_DELAY] = nfsd4_encode_fattr4__noop, 3439 [FATTR4_DIRENT_NOTIF_DELAY] = nfsd4_encode_fattr4__noop, 3440 [FATTR4_DACL] = nfsd4_encode_fattr4__noop, 3441 [FATTR4_SACL] = nfsd4_encode_fattr4__noop, 3442 [FATTR4_CHANGE_POLICY] = nfsd4_encode_fattr4__noop, 3443 [FATTR4_FS_STATUS] = nfsd4_encode_fattr4__noop, 3444 3445 #ifdef CONFIG_NFSD_PNFS 3446 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4_fs_layout_types, 3447 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop, 3448 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4_layout_types, 3449 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4_layout_blksize, 3450 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop, 3451 #else 3452 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop, 3453 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop, 3454 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop, 3455 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4__noop, 3456 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop, 3457 #endif 3458 3459 [FATTR4_FS_LOCATIONS_INFO] = nfsd4_encode_fattr4__noop, 3460 [FATTR4_MDSTHRESHOLD] = nfsd4_encode_fattr4__noop, 3461 [FATTR4_RETENTION_GET] = nfsd4_encode_fattr4__noop, 3462 [FATTR4_RETENTION_SET] = nfsd4_encode_fattr4__noop, 3463 [FATTR4_RETENTEVT_GET] = nfsd4_encode_fattr4__noop, 3464 [FATTR4_RETENTEVT_SET] = nfsd4_encode_fattr4__noop, 3465 [FATTR4_RETENTION_HOLD] = nfsd4_encode_fattr4__noop, 3466 [FATTR4_MODE_SET_MASKED] = nfsd4_encode_fattr4__noop, 3467 [FATTR4_SUPPATTR_EXCLCREAT] = nfsd4_encode_fattr4_suppattr_exclcreat, 3468 [FATTR4_FS_CHARSET_CAP] = nfsd4_encode_fattr4__noop, 3469 [FATTR4_CLONE_BLKSIZE] = nfsd4_encode_fattr4__noop, 3470 [FATTR4_SPACE_FREED] = nfsd4_encode_fattr4__noop, 3471 [FATTR4_CHANGE_ATTR_TYPE] = nfsd4_encode_fattr4__noop, 3472 3473 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3474 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4_sec_label, 3475 #else 3476 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4__noop, 3477 #endif 3478 3479 [FATTR4_MODE_UMASK] = nfsd4_encode_fattr4__noop, 3480 [FATTR4_XATTR_SUPPORT] = nfsd4_encode_fattr4_xattr_support, 3481 }; 3482 3483 /* 3484 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 3485 * ourselves. 3486 */ 3487 static __be32 3488 nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr, 3489 struct svc_fh *fhp, struct svc_export *exp, 3490 struct dentry *dentry, const u32 *bmval, 3491 int ignore_crossmnt) 3492 { 3493 DECLARE_BITMAP(attr_bitmap, ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)); 3494 struct nfsd4_fattr_args args; 3495 struct svc_fh *tempfh = NULL; 3496 int starting_len = xdr->buf->len; 3497 __be32 *attrlen_p, status; 3498 int attrlen_offset; 3499 u32 attrmask[3]; 3500 int err; 3501 struct nfsd4_compoundres *resp = rqstp->rq_resp; 3502 u32 minorversion = resp->cstate.minorversion; 3503 struct path path = { 3504 .mnt = exp->ex_path.mnt, 3505 .dentry = dentry, 3506 }; 3507 unsigned long bit; 3508 bool file_modified = false; 3509 u64 size = 0; 3510 3511 WARN_ON_ONCE(bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1); 3512 WARN_ON_ONCE(!nfsd_attrs_supported(minorversion, bmval)); 3513 3514 args.rqstp = rqstp; 3515 args.exp = exp; 3516 args.dentry = dentry; 3517 args.ignore_crossmnt = (ignore_crossmnt != 0); 3518 args.acl = NULL; 3519 3520 /* 3521 * Make a local copy of the attribute bitmap that can be modified. 3522 */ 3523 attrmask[0] = bmval[0]; 3524 attrmask[1] = bmval[1]; 3525 attrmask[2] = bmval[2]; 3526 3527 args.rdattr_err = 0; 3528 if (exp->ex_fslocs.migrated) { 3529 status = fattr_handle_absent_fs(&attrmask[0], &attrmask[1], 3530 &attrmask[2], &args.rdattr_err); 3531 if (status) 3532 goto out; 3533 } 3534 args.size = 0; 3535 if (attrmask[0] & (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE)) { 3536 status = nfsd4_deleg_getattr_conflict(rqstp, d_inode(dentry), 3537 &file_modified, &size); 3538 if (status) 3539 goto out; 3540 } 3541 3542 err = vfs_getattr(&path, &args.stat, 3543 STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE, 3544 AT_STATX_SYNC_AS_STAT); 3545 if (err) 3546 goto out_nfserr; 3547 if (file_modified) 3548 args.size = size; 3549 else 3550 args.size = args.stat.size; 3551 3552 if (!(args.stat.result_mask & STATX_BTIME)) 3553 /* underlying FS does not offer btime so we can't share it */ 3554 attrmask[1] &= ~FATTR4_WORD1_TIME_CREATE; 3555 if ((attrmask[0] & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE | 3556 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || 3557 (attrmask[1] & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 3558 FATTR4_WORD1_SPACE_TOTAL))) { 3559 err = vfs_statfs(&path, &args.statfs); 3560 if (err) 3561 goto out_nfserr; 3562 } 3563 if ((attrmask[0] & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && 3564 !fhp) { 3565 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); 3566 status = nfserr_jukebox; 3567 if (!tempfh) 3568 goto out; 3569 fh_init(tempfh, NFS4_FHSIZE); 3570 status = fh_compose(tempfh, exp, dentry, NULL); 3571 if (status) 3572 goto out; 3573 args.fhp = tempfh; 3574 } else 3575 args.fhp = fhp; 3576 3577 if (attrmask[0] & FATTR4_WORD0_ACL) { 3578 err = nfsd4_get_nfs4_acl(rqstp, dentry, &args.acl); 3579 if (err == -EOPNOTSUPP) 3580 attrmask[0] &= ~FATTR4_WORD0_ACL; 3581 else if (err == -EINVAL) { 3582 status = nfserr_attrnotsupp; 3583 goto out; 3584 } else if (err != 0) 3585 goto out_nfserr; 3586 } 3587 3588 args.contextsupport = false; 3589 3590 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3591 args.context = NULL; 3592 if ((attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) || 3593 attrmask[0] & FATTR4_WORD0_SUPPORTED_ATTRS) { 3594 if (exp->ex_flags & NFSEXP_SECURITY_LABEL) 3595 err = security_inode_getsecctx(d_inode(dentry), 3596 &args.context, &args.contextlen); 3597 else 3598 err = -EOPNOTSUPP; 3599 args.contextsupport = (err == 0); 3600 if (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) { 3601 if (err == -EOPNOTSUPP) 3602 attrmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3603 else if (err) 3604 goto out_nfserr; 3605 } 3606 } 3607 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 3608 3609 /* attrmask */ 3610 status = nfsd4_encode_bitmap4(xdr, attrmask[0], attrmask[1], 3611 attrmask[2]); 3612 if (status) 3613 goto out; 3614 3615 /* attr_vals */ 3616 attrlen_offset = xdr->buf->len; 3617 attrlen_p = xdr_reserve_space(xdr, XDR_UNIT); 3618 if (!attrlen_p) 3619 goto out_resource; 3620 bitmap_from_arr32(attr_bitmap, attrmask, 3621 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)); 3622 for_each_set_bit(bit, attr_bitmap, 3623 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)) { 3624 status = nfsd4_enc_fattr4_encode_ops[bit](xdr, &args); 3625 if (status != nfs_ok) 3626 goto out; 3627 } 3628 *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT); 3629 status = nfs_ok; 3630 3631 out: 3632 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3633 if (args.context) 3634 security_release_secctx(args.context, args.contextlen); 3635 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 3636 kfree(args.acl); 3637 if (tempfh) { 3638 fh_put(tempfh); 3639 kfree(tempfh); 3640 } 3641 if (status) 3642 xdr_truncate_encode(xdr, starting_len); 3643 return status; 3644 out_nfserr: 3645 status = nfserrno(err); 3646 goto out; 3647 out_resource: 3648 status = nfserr_resource; 3649 goto out; 3650 } 3651 3652 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, 3653 struct xdr_buf *buf, __be32 *p, int bytes) 3654 { 3655 xdr->scratch.iov_len = 0; 3656 memset(buf, 0, sizeof(struct xdr_buf)); 3657 buf->head[0].iov_base = p; 3658 buf->head[0].iov_len = 0; 3659 buf->len = 0; 3660 xdr->buf = buf; 3661 xdr->iov = buf->head; 3662 xdr->p = p; 3663 xdr->end = (void *)p + bytes; 3664 buf->buflen = bytes; 3665 } 3666 3667 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, 3668 struct svc_fh *fhp, struct svc_export *exp, 3669 struct dentry *dentry, u32 *bmval, 3670 struct svc_rqst *rqstp, int ignore_crossmnt) 3671 { 3672 struct xdr_buf dummy; 3673 struct xdr_stream xdr; 3674 __be32 ret; 3675 3676 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); 3677 ret = nfsd4_encode_fattr4(rqstp, &xdr, fhp, exp, dentry, bmval, 3678 ignore_crossmnt); 3679 *p = xdr.p; 3680 return ret; 3681 } 3682 3683 /* 3684 * The buffer space for this field was reserved during a previous 3685 * call to nfsd4_encode_entry4(). 3686 */ 3687 static void nfsd4_encode_entry4_nfs_cookie4(const struct nfsd4_readdir *readdir, 3688 u64 offset) 3689 { 3690 __be64 cookie = cpu_to_be64(offset); 3691 struct xdr_stream *xdr = readdir->xdr; 3692 3693 if (!readdir->cookie_offset) 3694 return; 3695 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, &cookie, 3696 sizeof(cookie)); 3697 } 3698 3699 static inline int attributes_need_mount(u32 *bmval) 3700 { 3701 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) 3702 return 1; 3703 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) 3704 return 1; 3705 return 0; 3706 } 3707 3708 static __be32 3709 nfsd4_encode_entry4_fattr(struct nfsd4_readdir *cd, const char *name, 3710 int namlen) 3711 { 3712 struct svc_export *exp = cd->rd_fhp->fh_export; 3713 struct dentry *dentry; 3714 __be32 nfserr; 3715 int ignore_crossmnt = 0; 3716 3717 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen); 3718 if (IS_ERR(dentry)) 3719 return nfserrno(PTR_ERR(dentry)); 3720 3721 exp_get(exp); 3722 /* 3723 * In the case of a mountpoint, the client may be asking for 3724 * attributes that are only properties of the underlying filesystem 3725 * as opposed to the cross-mounted file system. In such a case, 3726 * we will not follow the cross mount and will fill the attribtutes 3727 * directly from the mountpoint dentry. 3728 */ 3729 if (nfsd_mountpoint(dentry, exp)) { 3730 int err; 3731 3732 if (!(exp->ex_flags & NFSEXP_V4ROOT) 3733 && !attributes_need_mount(cd->rd_bmval)) { 3734 ignore_crossmnt = 1; 3735 goto out_encode; 3736 } 3737 /* 3738 * Why the heck aren't we just using nfsd_lookup?? 3739 * Different "."/".." handling? Something else? 3740 * At least, add a comment here to explain.... 3741 */ 3742 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); 3743 if (err) { 3744 nfserr = nfserrno(err); 3745 goto out_put; 3746 } 3747 nfserr = check_nfsd_access(exp, cd->rd_rqstp); 3748 if (nfserr) 3749 goto out_put; 3750 3751 } 3752 out_encode: 3753 nfserr = nfsd4_encode_fattr4(cd->rd_rqstp, cd->xdr, NULL, exp, dentry, 3754 cd->rd_bmval, ignore_crossmnt); 3755 out_put: 3756 dput(dentry); 3757 exp_put(exp); 3758 return nfserr; 3759 } 3760 3761 static __be32 3762 nfsd4_encode_entry4_rdattr_error(struct xdr_stream *xdr, __be32 nfserr) 3763 { 3764 __be32 status; 3765 3766 /* attrmask */ 3767 status = nfsd4_encode_bitmap4(xdr, FATTR4_WORD0_RDATTR_ERROR, 0, 0); 3768 if (status != nfs_ok) 3769 return status; 3770 /* attr_vals */ 3771 if (xdr_stream_encode_u32(xdr, XDR_UNIT) != XDR_UNIT) 3772 return nfserr_resource; 3773 /* rdattr_error */ 3774 if (xdr_stream_encode_be32(xdr, nfserr) != XDR_UNIT) 3775 return nfserr_resource; 3776 return nfs_ok; 3777 } 3778 3779 static int 3780 nfsd4_encode_entry4(void *ccdv, const char *name, int namlen, 3781 loff_t offset, u64 ino, unsigned int d_type) 3782 { 3783 struct readdir_cd *ccd = ccdv; 3784 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 3785 struct xdr_stream *xdr = cd->xdr; 3786 int start_offset = xdr->buf->len; 3787 int cookie_offset; 3788 u32 name_and_cookie; 3789 int entry_bytes; 3790 __be32 nfserr = nfserr_toosmall; 3791 3792 /* In nfsv4, "." and ".." never make it onto the wire.. */ 3793 if (name && isdotent(name, namlen)) { 3794 cd->common.err = nfs_ok; 3795 return 0; 3796 } 3797 3798 /* Encode the previous entry's cookie value */ 3799 nfsd4_encode_entry4_nfs_cookie4(cd, offset); 3800 3801 if (xdr_stream_encode_item_present(xdr) != XDR_UNIT) 3802 goto fail; 3803 3804 /* Reserve send buffer space for this entry's cookie value. */ 3805 cookie_offset = xdr->buf->len; 3806 if (nfsd4_encode_nfs_cookie4(xdr, OFFSET_MAX) != nfs_ok) 3807 goto fail; 3808 if (nfsd4_encode_component4(xdr, name, namlen) != nfs_ok) 3809 goto fail; 3810 nfserr = nfsd4_encode_entry4_fattr(cd, name, namlen); 3811 switch (nfserr) { 3812 case nfs_ok: 3813 break; 3814 case nfserr_resource: 3815 nfserr = nfserr_toosmall; 3816 goto fail; 3817 case nfserr_noent: 3818 xdr_truncate_encode(xdr, start_offset); 3819 goto skip_entry; 3820 case nfserr_jukebox: 3821 /* 3822 * The pseudoroot should only display dentries that lead to 3823 * exports. If we get EJUKEBOX here, then we can't tell whether 3824 * this entry should be included. Just fail the whole READDIR 3825 * with NFS4ERR_DELAY in that case, and hope that the situation 3826 * will resolve itself by the client's next attempt. 3827 */ 3828 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT) 3829 goto fail; 3830 fallthrough; 3831 default: 3832 /* 3833 * If the client requested the RDATTR_ERROR attribute, 3834 * we stuff the error code into this attribute 3835 * and continue. If this attribute was not requested, 3836 * then in accordance with the spec, we fail the 3837 * entire READDIR operation(!) 3838 */ 3839 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 3840 goto fail; 3841 if (nfsd4_encode_entry4_rdattr_error(xdr, nfserr)) { 3842 nfserr = nfserr_toosmall; 3843 goto fail; 3844 } 3845 } 3846 nfserr = nfserr_toosmall; 3847 entry_bytes = xdr->buf->len - start_offset; 3848 if (entry_bytes > cd->rd_maxcount) 3849 goto fail; 3850 cd->rd_maxcount -= entry_bytes; 3851 /* 3852 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and 3853 * notes that it could be zero. If it is zero, then the server 3854 * should enforce only the rd_maxcount value. 3855 */ 3856 if (cd->rd_dircount) { 3857 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8; 3858 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset) 3859 goto fail; 3860 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie); 3861 if (!cd->rd_dircount) 3862 cd->rd_maxcount = 0; 3863 } 3864 3865 cd->cookie_offset = cookie_offset; 3866 skip_entry: 3867 cd->common.err = nfs_ok; 3868 return 0; 3869 fail: 3870 xdr_truncate_encode(xdr, start_offset); 3871 cd->common.err = nfserr; 3872 return -EINVAL; 3873 } 3874 3875 static __be32 3876 nfsd4_encode_verifier4(struct xdr_stream *xdr, const nfs4_verifier *verf) 3877 { 3878 __be32 *p; 3879 3880 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3881 if (!p) 3882 return nfserr_resource; 3883 memcpy(p, verf->data, sizeof(verf->data)); 3884 return nfs_ok; 3885 } 3886 3887 static __be32 3888 nfsd4_encode_clientid4(struct xdr_stream *xdr, const clientid_t *clientid) 3889 { 3890 __be32 *p; 3891 3892 p = xdr_reserve_space(xdr, sizeof(__be64)); 3893 if (!p) 3894 return nfserr_resource; 3895 memcpy(p, clientid, sizeof(*clientid)); 3896 return nfs_ok; 3897 } 3898 3899 /* This is a frequently-encoded item; open-coded for speed */ 3900 static __be32 3901 nfsd4_encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) 3902 { 3903 __be32 *p; 3904 3905 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); 3906 if (!p) 3907 return nfserr_resource; 3908 *p++ = cpu_to_be32(sid->si_generation); 3909 memcpy(p, &sid->si_opaque, sizeof(sid->si_opaque)); 3910 return nfs_ok; 3911 } 3912 3913 static __be32 3914 nfsd4_encode_sessionid4(struct xdr_stream *xdr, 3915 const struct nfs4_sessionid *sessionid) 3916 { 3917 return nfsd4_encode_opaque_fixed(xdr, sessionid->data, 3918 NFS4_MAX_SESSIONID_LEN); 3919 } 3920 3921 static __be32 3922 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, 3923 union nfsd4_op_u *u) 3924 { 3925 struct nfsd4_access *access = &u->access; 3926 struct xdr_stream *xdr = resp->xdr; 3927 __be32 status; 3928 3929 /* supported */ 3930 status = nfsd4_encode_uint32_t(xdr, access->ac_supported); 3931 if (status != nfs_ok) 3932 return status; 3933 /* access */ 3934 return nfsd4_encode_uint32_t(xdr, access->ac_resp_access); 3935 } 3936 3937 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, 3938 union nfsd4_op_u *u) 3939 { 3940 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session; 3941 struct xdr_stream *xdr = resp->xdr; 3942 3943 /* bctsr_sessid */ 3944 nfserr = nfsd4_encode_sessionid4(xdr, &bcts->sessionid); 3945 if (nfserr != nfs_ok) 3946 return nfserr; 3947 /* bctsr_dir */ 3948 if (xdr_stream_encode_u32(xdr, bcts->dir) != XDR_UNIT) 3949 return nfserr_resource; 3950 /* bctsr_use_conn_in_rdma_mode */ 3951 return nfsd4_encode_bool(xdr, false); 3952 } 3953 3954 static __be32 3955 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, 3956 union nfsd4_op_u *u) 3957 { 3958 struct nfsd4_close *close = &u->close; 3959 struct xdr_stream *xdr = resp->xdr; 3960 3961 /* open_stateid */ 3962 return nfsd4_encode_stateid4(xdr, &close->cl_stateid); 3963 } 3964 3965 3966 static __be32 3967 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, 3968 union nfsd4_op_u *u) 3969 { 3970 struct nfsd4_commit *commit = &u->commit; 3971 3972 return nfsd4_encode_verifier4(resp->xdr, &commit->co_verf); 3973 } 3974 3975 static __be32 3976 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, 3977 union nfsd4_op_u *u) 3978 { 3979 struct nfsd4_create *create = &u->create; 3980 struct xdr_stream *xdr = resp->xdr; 3981 3982 /* cinfo */ 3983 nfserr = nfsd4_encode_change_info4(xdr, &create->cr_cinfo); 3984 if (nfserr) 3985 return nfserr; 3986 /* attrset */ 3987 return nfsd4_encode_bitmap4(xdr, create->cr_bmval[0], 3988 create->cr_bmval[1], create->cr_bmval[2]); 3989 } 3990 3991 static __be32 3992 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, 3993 union nfsd4_op_u *u) 3994 { 3995 struct nfsd4_getattr *getattr = &u->getattr; 3996 struct svc_fh *fhp = getattr->ga_fhp; 3997 struct xdr_stream *xdr = resp->xdr; 3998 3999 /* obj_attributes */ 4000 return nfsd4_encode_fattr4(resp->rqstp, xdr, fhp, fhp->fh_export, 4001 fhp->fh_dentry, getattr->ga_bmval, 0); 4002 } 4003 4004 static __be32 4005 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, 4006 union nfsd4_op_u *u) 4007 { 4008 struct xdr_stream *xdr = resp->xdr; 4009 struct svc_fh *fhp = u->getfh; 4010 4011 /* object */ 4012 return nfsd4_encode_nfs_fh4(xdr, &fhp->fh_handle); 4013 } 4014 4015 static __be32 4016 nfsd4_encode_lock_owner4(struct xdr_stream *xdr, const clientid_t *clientid, 4017 const struct xdr_netobj *owner) 4018 { 4019 __be32 status; 4020 4021 /* clientid */ 4022 status = nfsd4_encode_clientid4(xdr, clientid); 4023 if (status != nfs_ok) 4024 return status; 4025 /* owner */ 4026 return nfsd4_encode_opaque(xdr, owner->data, owner->len); 4027 } 4028 4029 static __be32 4030 nfsd4_encode_lock4denied(struct xdr_stream *xdr, 4031 const struct nfsd4_lock_denied *ld) 4032 { 4033 __be32 status; 4034 4035 /* offset */ 4036 status = nfsd4_encode_offset4(xdr, ld->ld_start); 4037 if (status != nfs_ok) 4038 return status; 4039 /* length */ 4040 status = nfsd4_encode_length4(xdr, ld->ld_length); 4041 if (status != nfs_ok) 4042 return status; 4043 /* locktype */ 4044 if (xdr_stream_encode_u32(xdr, ld->ld_type) != XDR_UNIT) 4045 return nfserr_resource; 4046 /* owner */ 4047 return nfsd4_encode_lock_owner4(xdr, &ld->ld_clientid, 4048 &ld->ld_owner); 4049 } 4050 4051 static __be32 4052 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, 4053 union nfsd4_op_u *u) 4054 { 4055 struct nfsd4_lock *lock = &u->lock; 4056 struct xdr_stream *xdr = resp->xdr; 4057 __be32 status; 4058 4059 switch (nfserr) { 4060 case nfs_ok: 4061 /* resok4 */ 4062 status = nfsd4_encode_stateid4(xdr, &lock->lk_resp_stateid); 4063 break; 4064 case nfserr_denied: 4065 /* denied */ 4066 status = nfsd4_encode_lock4denied(xdr, &lock->lk_denied); 4067 break; 4068 default: 4069 return nfserr; 4070 } 4071 return status != nfs_ok ? status : nfserr; 4072 } 4073 4074 static __be32 4075 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, 4076 union nfsd4_op_u *u) 4077 { 4078 struct nfsd4_lockt *lockt = &u->lockt; 4079 struct xdr_stream *xdr = resp->xdr; 4080 __be32 status; 4081 4082 if (nfserr == nfserr_denied) { 4083 /* denied */ 4084 status = nfsd4_encode_lock4denied(xdr, &lockt->lt_denied); 4085 if (status != nfs_ok) 4086 return status; 4087 } 4088 return nfserr; 4089 } 4090 4091 static __be32 4092 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, 4093 union nfsd4_op_u *u) 4094 { 4095 struct nfsd4_locku *locku = &u->locku; 4096 struct xdr_stream *xdr = resp->xdr; 4097 4098 /* lock_stateid */ 4099 return nfsd4_encode_stateid4(xdr, &locku->lu_stateid); 4100 } 4101 4102 4103 static __be32 4104 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, 4105 union nfsd4_op_u *u) 4106 { 4107 struct nfsd4_link *link = &u->link; 4108 struct xdr_stream *xdr = resp->xdr; 4109 4110 return nfsd4_encode_change_info4(xdr, &link->li_cinfo); 4111 } 4112 4113 /* 4114 * This implementation does not yet support returning an ACE in an 4115 * OPEN that offers a delegation. 4116 */ 4117 static __be32 4118 nfsd4_encode_open_nfsace4(struct xdr_stream *xdr) 4119 { 4120 __be32 status; 4121 4122 /* type */ 4123 status = nfsd4_encode_acetype4(xdr, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 4124 if (status != nfs_ok) 4125 return nfserr_resource; 4126 /* flag */ 4127 status = nfsd4_encode_aceflag4(xdr, 0); 4128 if (status != nfs_ok) 4129 return nfserr_resource; 4130 /* access mask */ 4131 status = nfsd4_encode_acemask4(xdr, 0); 4132 if (status != nfs_ok) 4133 return nfserr_resource; 4134 /* who - empty for now */ 4135 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT) 4136 return nfserr_resource; 4137 return nfs_ok; 4138 } 4139 4140 static __be32 4141 nfsd4_encode_open_read_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open) 4142 { 4143 __be32 status; 4144 4145 /* stateid */ 4146 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid); 4147 if (status != nfs_ok) 4148 return status; 4149 /* recall */ 4150 status = nfsd4_encode_bool(xdr, open->op_recall); 4151 if (status != nfs_ok) 4152 return status; 4153 /* permissions */ 4154 return nfsd4_encode_open_nfsace4(xdr); 4155 } 4156 4157 static __be32 4158 nfsd4_encode_nfs_space_limit4(struct xdr_stream *xdr, u64 filesize) 4159 { 4160 /* limitby */ 4161 if (xdr_stream_encode_u32(xdr, NFS4_LIMIT_SIZE) != XDR_UNIT) 4162 return nfserr_resource; 4163 /* filesize */ 4164 return nfsd4_encode_uint64_t(xdr, filesize); 4165 } 4166 4167 static __be32 4168 nfsd4_encode_open_write_delegation4(struct xdr_stream *xdr, 4169 struct nfsd4_open *open) 4170 { 4171 __be32 status; 4172 4173 /* stateid */ 4174 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid); 4175 if (status != nfs_ok) 4176 return status; 4177 /* recall */ 4178 status = nfsd4_encode_bool(xdr, open->op_recall); 4179 if (status != nfs_ok) 4180 return status; 4181 /* space_limit */ 4182 status = nfsd4_encode_nfs_space_limit4(xdr, 0); 4183 if (status != nfs_ok) 4184 return status; 4185 return nfsd4_encode_open_nfsace4(xdr); 4186 } 4187 4188 static __be32 4189 nfsd4_encode_open_none_delegation4(struct xdr_stream *xdr, 4190 struct nfsd4_open *open) 4191 { 4192 __be32 status = nfs_ok; 4193 4194 /* ond_why */ 4195 if (xdr_stream_encode_u32(xdr, open->op_why_no_deleg) != XDR_UNIT) 4196 return nfserr_resource; 4197 switch (open->op_why_no_deleg) { 4198 case WND4_CONTENTION: 4199 /* ond_server_will_push_deleg */ 4200 status = nfsd4_encode_bool(xdr, false); 4201 break; 4202 case WND4_RESOURCE: 4203 /* ond_server_will_signal_avail */ 4204 status = nfsd4_encode_bool(xdr, false); 4205 } 4206 return status; 4207 } 4208 4209 static __be32 4210 nfsd4_encode_open_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open) 4211 { 4212 __be32 status; 4213 4214 /* delegation_type */ 4215 if (xdr_stream_encode_u32(xdr, open->op_delegate_type) != XDR_UNIT) 4216 return nfserr_resource; 4217 switch (open->op_delegate_type) { 4218 case NFS4_OPEN_DELEGATE_NONE: 4219 status = nfs_ok; 4220 break; 4221 case NFS4_OPEN_DELEGATE_READ: 4222 /* read */ 4223 status = nfsd4_encode_open_read_delegation4(xdr, open); 4224 break; 4225 case NFS4_OPEN_DELEGATE_WRITE: 4226 /* write */ 4227 status = nfsd4_encode_open_write_delegation4(xdr, open); 4228 break; 4229 case NFS4_OPEN_DELEGATE_NONE_EXT: 4230 /* od_whynone */ 4231 status = nfsd4_encode_open_none_delegation4(xdr, open); 4232 break; 4233 default: 4234 status = nfserr_serverfault; 4235 } 4236 4237 return status; 4238 } 4239 4240 static __be32 4241 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, 4242 union nfsd4_op_u *u) 4243 { 4244 struct nfsd4_open *open = &u->open; 4245 struct xdr_stream *xdr = resp->xdr; 4246 4247 /* stateid */ 4248 nfserr = nfsd4_encode_stateid4(xdr, &open->op_stateid); 4249 if (nfserr != nfs_ok) 4250 return nfserr; 4251 /* cinfo */ 4252 nfserr = nfsd4_encode_change_info4(xdr, &open->op_cinfo); 4253 if (nfserr != nfs_ok) 4254 return nfserr; 4255 /* rflags */ 4256 nfserr = nfsd4_encode_uint32_t(xdr, open->op_rflags); 4257 if (nfserr != nfs_ok) 4258 return nfserr; 4259 /* attrset */ 4260 nfserr = nfsd4_encode_bitmap4(xdr, open->op_bmval[0], 4261 open->op_bmval[1], open->op_bmval[2]); 4262 if (nfserr != nfs_ok) 4263 return nfserr; 4264 /* delegation */ 4265 return nfsd4_encode_open_delegation4(xdr, open); 4266 } 4267 4268 static __be32 4269 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, 4270 union nfsd4_op_u *u) 4271 { 4272 struct nfsd4_open_confirm *oc = &u->open_confirm; 4273 struct xdr_stream *xdr = resp->xdr; 4274 4275 /* open_stateid */ 4276 return nfsd4_encode_stateid4(xdr, &oc->oc_resp_stateid); 4277 } 4278 4279 static __be32 4280 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, 4281 union nfsd4_op_u *u) 4282 { 4283 struct nfsd4_open_downgrade *od = &u->open_downgrade; 4284 struct xdr_stream *xdr = resp->xdr; 4285 4286 /* open_stateid */ 4287 return nfsd4_encode_stateid4(xdr, &od->od_stateid); 4288 } 4289 4290 /* 4291 * The operation of this function assumes that this is the only 4292 * READ operation in the COMPOUND. If there are multiple READs, 4293 * we use nfsd4_encode_readv(). 4294 */ 4295 static __be32 nfsd4_encode_splice_read( 4296 struct nfsd4_compoundres *resp, 4297 struct nfsd4_read *read, 4298 struct file *file, unsigned long maxcount) 4299 { 4300 struct xdr_stream *xdr = resp->xdr; 4301 struct xdr_buf *buf = xdr->buf; 4302 int status, space_left; 4303 __be32 nfserr; 4304 4305 /* 4306 * Make sure there is room at the end of buf->head for 4307 * svcxdr_encode_opaque_pages() to create a tail buffer 4308 * to XDR-pad the payload. 4309 */ 4310 if (xdr->iov != xdr->buf->head || xdr->end - xdr->p < 1) 4311 return nfserr_resource; 4312 4313 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp, 4314 file, read->rd_offset, &maxcount, 4315 &read->rd_eof); 4316 read->rd_length = maxcount; 4317 if (nfserr) 4318 goto out_err; 4319 svcxdr_encode_opaque_pages(read->rd_rqstp, xdr, buf->pages, 4320 buf->page_base, maxcount); 4321 status = svc_encode_result_payload(read->rd_rqstp, 4322 buf->head[0].iov_len, maxcount); 4323 if (status) { 4324 nfserr = nfserrno(status); 4325 goto out_err; 4326 } 4327 4328 /* 4329 * Prepare to encode subsequent operations. 4330 * 4331 * xdr_truncate_encode() is not safe to use after a successful 4332 * splice read has been done, so the following stream 4333 * manipulations are open-coded. 4334 */ 4335 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p, 4336 buf->buflen - buf->len); 4337 buf->buflen = buf->len + space_left; 4338 xdr->end = (__be32 *)((void *)xdr->end + space_left); 4339 4340 return nfs_ok; 4341 4342 out_err: 4343 /* 4344 * nfsd_splice_actor may have already messed with the 4345 * page length; reset it so as not to confuse 4346 * xdr_truncate_encode in our caller. 4347 */ 4348 buf->page_len = 0; 4349 return nfserr; 4350 } 4351 4352 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, 4353 struct nfsd4_read *read, 4354 struct file *file, unsigned long maxcount) 4355 { 4356 struct xdr_stream *xdr = resp->xdr; 4357 unsigned int base = xdr->buf->page_len & ~PAGE_MASK; 4358 unsigned int starting_len = xdr->buf->len; 4359 __be32 zero = xdr_zero; 4360 __be32 nfserr; 4361 4362 if (xdr_reserve_space_vec(xdr, maxcount) < 0) 4363 return nfserr_resource; 4364 4365 nfserr = nfsd_iter_read(resp->rqstp, read->rd_fhp, file, 4366 read->rd_offset, &maxcount, base, 4367 &read->rd_eof); 4368 read->rd_length = maxcount; 4369 if (nfserr) 4370 return nfserr; 4371 if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount)) 4372 return nfserr_io; 4373 xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount)); 4374 4375 write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero, 4376 xdr_pad_size(maxcount)); 4377 return nfs_ok; 4378 } 4379 4380 static __be32 4381 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 4382 union nfsd4_op_u *u) 4383 { 4384 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp; 4385 struct nfsd4_read *read = &u->read; 4386 struct xdr_stream *xdr = resp->xdr; 4387 int starting_len = xdr->buf->len; 4388 bool splice_ok = argp->splice_ok; 4389 unsigned long maxcount; 4390 struct file *file; 4391 __be32 *p; 4392 4393 if (nfserr) 4394 return nfserr; 4395 file = read->rd_nf->nf_file; 4396 4397 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ 4398 if (!p) { 4399 WARN_ON_ONCE(splice_ok); 4400 return nfserr_resource; 4401 } 4402 if (resp->xdr->buf->page_len && splice_ok) { 4403 WARN_ON_ONCE(1); 4404 return nfserr_serverfault; 4405 } 4406 xdr_commit_encode(xdr); 4407 4408 maxcount = min_t(unsigned long, read->rd_length, 4409 (xdr->buf->buflen - xdr->buf->len)); 4410 4411 if (file->f_op->splice_read && splice_ok) 4412 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 4413 else 4414 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 4415 if (nfserr) { 4416 xdr_truncate_encode(xdr, starting_len); 4417 return nfserr; 4418 } 4419 4420 p = xdr_encode_bool(p, read->rd_eof); 4421 *p = cpu_to_be32(read->rd_length); 4422 return nfs_ok; 4423 } 4424 4425 static __be32 4426 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, 4427 union nfsd4_op_u *u) 4428 { 4429 struct nfsd4_readlink *readlink = &u->readlink; 4430 __be32 *p, *maxcount_p, zero = xdr_zero; 4431 struct xdr_stream *xdr = resp->xdr; 4432 int length_offset = xdr->buf->len; 4433 int maxcount, status; 4434 4435 maxcount_p = xdr_reserve_space(xdr, XDR_UNIT); 4436 if (!maxcount_p) 4437 return nfserr_resource; 4438 maxcount = PAGE_SIZE; 4439 4440 p = xdr_reserve_space(xdr, maxcount); 4441 if (!p) 4442 return nfserr_resource; 4443 /* 4444 * XXX: By default, vfs_readlink() will truncate symlinks if they 4445 * would overflow the buffer. Is this kosher in NFSv4? If not, one 4446 * easy fix is: if vfs_readlink() precisely fills the buffer, assume 4447 * that truncation occurred, and return NFS4ERR_RESOURCE. 4448 */ 4449 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, 4450 (char *)p, &maxcount); 4451 if (nfserr == nfserr_isdir) 4452 nfserr = nfserr_inval; 4453 if (nfserr) 4454 goto out_err; 4455 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset, 4456 maxcount); 4457 if (status) { 4458 nfserr = nfserrno(status); 4459 goto out_err; 4460 } 4461 *maxcount_p = cpu_to_be32(maxcount); 4462 xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount)); 4463 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero, 4464 xdr_pad_size(maxcount)); 4465 return nfs_ok; 4466 4467 out_err: 4468 xdr_truncate_encode(xdr, length_offset); 4469 return nfserr; 4470 } 4471 4472 static __be32 nfsd4_encode_dirlist4(struct xdr_stream *xdr, 4473 struct nfsd4_readdir *readdir, 4474 u32 max_payload) 4475 { 4476 int bytes_left, maxcount, starting_len = xdr->buf->len; 4477 loff_t offset; 4478 __be32 status; 4479 4480 /* 4481 * Number of bytes left for directory entries allowing for the 4482 * final 8 bytes of the readdir and a following failed op. 4483 */ 4484 bytes_left = xdr->buf->buflen - xdr->buf->len - 4485 COMPOUND_ERR_SLACK_SPACE - XDR_UNIT * 2; 4486 if (bytes_left < 0) 4487 return nfserr_resource; 4488 maxcount = min_t(u32, readdir->rd_maxcount, max_payload); 4489 4490 /* 4491 * The RFC defines rd_maxcount as the size of the 4492 * READDIR4resok structure, which includes the verifier 4493 * and the 8 bytes encoded at the end of this function. 4494 */ 4495 if (maxcount < XDR_UNIT * 4) 4496 return nfserr_toosmall; 4497 maxcount = min_t(int, maxcount - XDR_UNIT * 4, bytes_left); 4498 4499 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0 */ 4500 if (!readdir->rd_dircount) 4501 readdir->rd_dircount = max_payload; 4502 4503 /* *entries */ 4504 readdir->xdr = xdr; 4505 readdir->rd_maxcount = maxcount; 4506 readdir->common.err = 0; 4507 readdir->cookie_offset = 0; 4508 offset = readdir->rd_cookie; 4509 status = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, &offset, 4510 &readdir->common, nfsd4_encode_entry4); 4511 if (status) 4512 return status; 4513 if (readdir->common.err == nfserr_toosmall && 4514 xdr->buf->len == starting_len) { 4515 /* No entries were encoded. Which limit did we hit? */ 4516 if (maxcount - XDR_UNIT * 4 < bytes_left) 4517 /* It was the fault of rd_maxcount */ 4518 return nfserr_toosmall; 4519 /* We ran out of buffer space */ 4520 return nfserr_resource; 4521 } 4522 /* Encode the final entry's cookie value */ 4523 nfsd4_encode_entry4_nfs_cookie4(readdir, offset); 4524 /* No entries follow */ 4525 if (xdr_stream_encode_item_absent(xdr) != XDR_UNIT) 4526 return nfserr_resource; 4527 4528 /* eof */ 4529 return nfsd4_encode_bool(xdr, readdir->common.err == nfserr_eof); 4530 } 4531 4532 static __be32 4533 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, 4534 union nfsd4_op_u *u) 4535 { 4536 struct nfsd4_readdir *readdir = &u->readdir; 4537 struct xdr_stream *xdr = resp->xdr; 4538 int starting_len = xdr->buf->len; 4539 4540 /* cookieverf */ 4541 nfserr = nfsd4_encode_verifier4(xdr, &readdir->rd_verf); 4542 if (nfserr != nfs_ok) 4543 return nfserr; 4544 4545 /* reply */ 4546 nfserr = nfsd4_encode_dirlist4(xdr, readdir, svc_max_payload(resp->rqstp)); 4547 if (nfserr != nfs_ok) 4548 xdr_truncate_encode(xdr, starting_len); 4549 return nfserr; 4550 } 4551 4552 static __be32 4553 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, 4554 union nfsd4_op_u *u) 4555 { 4556 struct nfsd4_remove *remove = &u->remove; 4557 struct xdr_stream *xdr = resp->xdr; 4558 4559 return nfsd4_encode_change_info4(xdr, &remove->rm_cinfo); 4560 } 4561 4562 static __be32 4563 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, 4564 union nfsd4_op_u *u) 4565 { 4566 struct nfsd4_rename *rename = &u->rename; 4567 struct xdr_stream *xdr = resp->xdr; 4568 4569 nfserr = nfsd4_encode_change_info4(xdr, &rename->rn_sinfo); 4570 if (nfserr) 4571 return nfserr; 4572 return nfsd4_encode_change_info4(xdr, &rename->rn_tinfo); 4573 } 4574 4575 static __be32 4576 nfsd4_encode_rpcsec_gss_info(struct xdr_stream *xdr, 4577 struct rpcsec_gss_info *info) 4578 { 4579 __be32 status; 4580 4581 /* oid */ 4582 if (xdr_stream_encode_opaque(xdr, info->oid.data, info->oid.len) < 0) 4583 return nfserr_resource; 4584 /* qop */ 4585 status = nfsd4_encode_qop4(xdr, info->qop); 4586 if (status != nfs_ok) 4587 return status; 4588 /* service */ 4589 if (xdr_stream_encode_u32(xdr, info->service) != XDR_UNIT) 4590 return nfserr_resource; 4591 4592 return nfs_ok; 4593 } 4594 4595 static __be32 4596 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp) 4597 { 4598 u32 i, nflavs, supported; 4599 struct exp_flavor_info *flavs; 4600 struct exp_flavor_info def_flavs[2]; 4601 static bool report = true; 4602 __be32 *flavorsp; 4603 __be32 status; 4604 4605 if (exp->ex_nflavors) { 4606 flavs = exp->ex_flavors; 4607 nflavs = exp->ex_nflavors; 4608 } else { /* Handling of some defaults in absence of real secinfo: */ 4609 flavs = def_flavs; 4610 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { 4611 nflavs = 2; 4612 flavs[0].pseudoflavor = RPC_AUTH_UNIX; 4613 flavs[1].pseudoflavor = RPC_AUTH_NULL; 4614 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { 4615 nflavs = 1; 4616 flavs[0].pseudoflavor 4617 = svcauth_gss_flavor(exp->ex_client); 4618 } else { 4619 nflavs = 1; 4620 flavs[0].pseudoflavor 4621 = exp->ex_client->flavour->flavour; 4622 } 4623 } 4624 4625 supported = 0; 4626 flavorsp = xdr_reserve_space(xdr, XDR_UNIT); 4627 if (!flavorsp) 4628 return nfserr_resource; 4629 4630 for (i = 0; i < nflavs; i++) { 4631 rpc_authflavor_t pf = flavs[i].pseudoflavor; 4632 struct rpcsec_gss_info info; 4633 4634 if (rpcauth_get_gssinfo(pf, &info) == 0) { 4635 supported++; 4636 4637 /* flavor */ 4638 status = nfsd4_encode_uint32_t(xdr, RPC_AUTH_GSS); 4639 if (status != nfs_ok) 4640 return status; 4641 /* flavor_info */ 4642 status = nfsd4_encode_rpcsec_gss_info(xdr, &info); 4643 if (status != nfs_ok) 4644 return status; 4645 } else if (pf < RPC_AUTH_MAXFLAVOR) { 4646 supported++; 4647 4648 /* flavor */ 4649 status = nfsd4_encode_uint32_t(xdr, pf); 4650 if (status != nfs_ok) 4651 return status; 4652 } else { 4653 if (report) 4654 pr_warn("NFS: SECINFO: security flavor %u " 4655 "is not supported\n", pf); 4656 } 4657 } 4658 4659 if (nflavs != supported) 4660 report = false; 4661 *flavorsp = cpu_to_be32(supported); 4662 return 0; 4663 } 4664 4665 static __be32 4666 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4667 union nfsd4_op_u *u) 4668 { 4669 struct nfsd4_secinfo *secinfo = &u->secinfo; 4670 struct xdr_stream *xdr = resp->xdr; 4671 4672 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp); 4673 } 4674 4675 static __be32 4676 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, 4677 union nfsd4_op_u *u) 4678 { 4679 struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name; 4680 struct xdr_stream *xdr = resp->xdr; 4681 4682 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp); 4683 } 4684 4685 static __be32 4686 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, 4687 union nfsd4_op_u *u) 4688 { 4689 struct nfsd4_setattr *setattr = &u->setattr; 4690 __be32 status; 4691 4692 switch (nfserr) { 4693 case nfs_ok: 4694 /* attrsset */ 4695 status = nfsd4_encode_bitmap4(resp->xdr, setattr->sa_bmval[0], 4696 setattr->sa_bmval[1], 4697 setattr->sa_bmval[2]); 4698 break; 4699 default: 4700 /* attrsset */ 4701 status = nfsd4_encode_bitmap4(resp->xdr, 0, 0, 0); 4702 } 4703 return status != nfs_ok ? status : nfserr; 4704 } 4705 4706 static __be32 4707 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, 4708 union nfsd4_op_u *u) 4709 { 4710 struct nfsd4_setclientid *scd = &u->setclientid; 4711 struct xdr_stream *xdr = resp->xdr; 4712 4713 if (!nfserr) { 4714 nfserr = nfsd4_encode_clientid4(xdr, &scd->se_clientid); 4715 if (nfserr != nfs_ok) 4716 goto out; 4717 nfserr = nfsd4_encode_verifier4(xdr, &scd->se_confirm); 4718 } else if (nfserr == nfserr_clid_inuse) { 4719 /* empty network id */ 4720 if (xdr_stream_encode_u32(xdr, 0) < 0) { 4721 nfserr = nfserr_resource; 4722 goto out; 4723 } 4724 /* empty universal address */ 4725 if (xdr_stream_encode_u32(xdr, 0) < 0) { 4726 nfserr = nfserr_resource; 4727 goto out; 4728 } 4729 } 4730 out: 4731 return nfserr; 4732 } 4733 4734 static __be32 4735 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, 4736 union nfsd4_op_u *u) 4737 { 4738 struct nfsd4_write *write = &u->write; 4739 struct xdr_stream *xdr = resp->xdr; 4740 4741 /* count */ 4742 nfserr = nfsd4_encode_count4(xdr, write->wr_bytes_written); 4743 if (nfserr) 4744 return nfserr; 4745 /* committed */ 4746 if (xdr_stream_encode_u32(xdr, write->wr_how_written) != XDR_UNIT) 4747 return nfserr_resource; 4748 /* writeverf */ 4749 return nfsd4_encode_verifier4(xdr, &write->wr_verifier); 4750 } 4751 4752 static __be32 4753 nfsd4_encode_state_protect_ops4(struct xdr_stream *xdr, 4754 struct nfsd4_exchange_id *exid) 4755 { 4756 __be32 status; 4757 4758 /* spo_must_enforce */ 4759 status = nfsd4_encode_bitmap4(xdr, exid->spo_must_enforce[0], 4760 exid->spo_must_enforce[1], 4761 exid->spo_must_enforce[2]); 4762 if (status != nfs_ok) 4763 return status; 4764 /* spo_must_allow */ 4765 return nfsd4_encode_bitmap4(xdr, exid->spo_must_allow[0], 4766 exid->spo_must_allow[1], 4767 exid->spo_must_allow[2]); 4768 } 4769 4770 static __be32 4771 nfsd4_encode_state_protect4_r(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid) 4772 { 4773 __be32 status; 4774 4775 if (xdr_stream_encode_u32(xdr, exid->spa_how) != XDR_UNIT) 4776 return nfserr_resource; 4777 switch (exid->spa_how) { 4778 case SP4_NONE: 4779 status = nfs_ok; 4780 break; 4781 case SP4_MACH_CRED: 4782 /* spr_mach_ops */ 4783 status = nfsd4_encode_state_protect_ops4(xdr, exid); 4784 break; 4785 default: 4786 status = nfserr_serverfault; 4787 } 4788 return status; 4789 } 4790 4791 static __be32 4792 nfsd4_encode_server_owner4(struct xdr_stream *xdr, struct svc_rqst *rqstp) 4793 { 4794 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 4795 __be32 status; 4796 4797 /* so_minor_id */ 4798 status = nfsd4_encode_uint64_t(xdr, 0); 4799 if (status != nfs_ok) 4800 return status; 4801 /* so_major_id */ 4802 return nfsd4_encode_opaque(xdr, nn->nfsd_name, strlen(nn->nfsd_name)); 4803 } 4804 4805 static __be32 4806 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, 4807 union nfsd4_op_u *u) 4808 { 4809 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id); 4810 struct nfsd4_exchange_id *exid = &u->exchange_id; 4811 struct xdr_stream *xdr = resp->xdr; 4812 4813 /* eir_clientid */ 4814 nfserr = nfsd4_encode_clientid4(xdr, &exid->clientid); 4815 if (nfserr != nfs_ok) 4816 return nfserr; 4817 /* eir_sequenceid */ 4818 nfserr = nfsd4_encode_sequenceid4(xdr, exid->seqid); 4819 if (nfserr != nfs_ok) 4820 return nfserr; 4821 /* eir_flags */ 4822 nfserr = nfsd4_encode_uint32_t(xdr, exid->flags); 4823 if (nfserr != nfs_ok) 4824 return nfserr; 4825 /* eir_state_protect */ 4826 nfserr = nfsd4_encode_state_protect4_r(xdr, exid); 4827 if (nfserr != nfs_ok) 4828 return nfserr; 4829 /* eir_server_owner */ 4830 nfserr = nfsd4_encode_server_owner4(xdr, resp->rqstp); 4831 if (nfserr != nfs_ok) 4832 return nfserr; 4833 /* eir_server_scope */ 4834 nfserr = nfsd4_encode_opaque(xdr, nn->nfsd_name, 4835 strlen(nn->nfsd_name)); 4836 if (nfserr != nfs_ok) 4837 return nfserr; 4838 /* eir_server_impl_id<1> */ 4839 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT) 4840 return nfserr_resource; 4841 4842 return nfs_ok; 4843 } 4844 4845 static __be32 4846 nfsd4_encode_channel_attrs4(struct xdr_stream *xdr, 4847 const struct nfsd4_channel_attrs *attrs) 4848 { 4849 __be32 status; 4850 4851 /* ca_headerpadsize */ 4852 status = nfsd4_encode_count4(xdr, 0); 4853 if (status != nfs_ok) 4854 return status; 4855 /* ca_maxrequestsize */ 4856 status = nfsd4_encode_count4(xdr, attrs->maxreq_sz); 4857 if (status != nfs_ok) 4858 return status; 4859 /* ca_maxresponsesize */ 4860 status = nfsd4_encode_count4(xdr, attrs->maxresp_sz); 4861 if (status != nfs_ok) 4862 return status; 4863 /* ca_maxresponsesize_cached */ 4864 status = nfsd4_encode_count4(xdr, attrs->maxresp_cached); 4865 if (status != nfs_ok) 4866 return status; 4867 /* ca_maxoperations */ 4868 status = nfsd4_encode_count4(xdr, attrs->maxops); 4869 if (status != nfs_ok) 4870 return status; 4871 /* ca_maxrequests */ 4872 status = nfsd4_encode_count4(xdr, attrs->maxreqs); 4873 if (status != nfs_ok) 4874 return status; 4875 /* ca_rdma_ird<1> */ 4876 if (xdr_stream_encode_u32(xdr, attrs->nr_rdma_attrs) != XDR_UNIT) 4877 return nfserr_resource; 4878 if (attrs->nr_rdma_attrs) 4879 return nfsd4_encode_uint32_t(xdr, attrs->rdma_attrs); 4880 return nfs_ok; 4881 } 4882 4883 static __be32 4884 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, 4885 union nfsd4_op_u *u) 4886 { 4887 struct nfsd4_create_session *sess = &u->create_session; 4888 struct xdr_stream *xdr = resp->xdr; 4889 4890 /* csr_sessionid */ 4891 nfserr = nfsd4_encode_sessionid4(xdr, &sess->sessionid); 4892 if (nfserr != nfs_ok) 4893 return nfserr; 4894 /* csr_sequence */ 4895 nfserr = nfsd4_encode_sequenceid4(xdr, sess->seqid); 4896 if (nfserr != nfs_ok) 4897 return nfserr; 4898 /* csr_flags */ 4899 nfserr = nfsd4_encode_uint32_t(xdr, sess->flags); 4900 if (nfserr != nfs_ok) 4901 return nfserr; 4902 /* csr_fore_chan_attrs */ 4903 nfserr = nfsd4_encode_channel_attrs4(xdr, &sess->fore_channel); 4904 if (nfserr != nfs_ok) 4905 return nfserr; 4906 /* csr_back_chan_attrs */ 4907 return nfsd4_encode_channel_attrs4(xdr, &sess->back_channel); 4908 } 4909 4910 static __be32 4911 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, 4912 union nfsd4_op_u *u) 4913 { 4914 struct nfsd4_sequence *seq = &u->sequence; 4915 struct xdr_stream *xdr = resp->xdr; 4916 4917 /* sr_sessionid */ 4918 nfserr = nfsd4_encode_sessionid4(xdr, &seq->sessionid); 4919 if (nfserr != nfs_ok) 4920 return nfserr; 4921 /* sr_sequenceid */ 4922 nfserr = nfsd4_encode_sequenceid4(xdr, seq->seqid); 4923 if (nfserr != nfs_ok) 4924 return nfserr; 4925 /* sr_slotid */ 4926 nfserr = nfsd4_encode_slotid4(xdr, seq->slotid); 4927 if (nfserr != nfs_ok) 4928 return nfserr; 4929 /* Note slotid's are numbered from zero: */ 4930 /* sr_highest_slotid */ 4931 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1); 4932 if (nfserr != nfs_ok) 4933 return nfserr; 4934 /* sr_target_highest_slotid */ 4935 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1); 4936 if (nfserr != nfs_ok) 4937 return nfserr; 4938 /* sr_status_flags */ 4939 nfserr = nfsd4_encode_uint32_t(xdr, seq->status_flags); 4940 if (nfserr != nfs_ok) 4941 return nfserr; 4942 4943 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */ 4944 return nfs_ok; 4945 } 4946 4947 static __be32 4948 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, 4949 union nfsd4_op_u *u) 4950 { 4951 struct nfsd4_test_stateid *test_stateid = &u->test_stateid; 4952 struct nfsd4_test_stateid_id *stateid, *next; 4953 struct xdr_stream *xdr = resp->xdr; 4954 4955 /* tsr_status_codes<> */ 4956 if (xdr_stream_encode_u32(xdr, test_stateid->ts_num_ids) != XDR_UNIT) 4957 return nfserr_resource; 4958 list_for_each_entry_safe(stateid, next, 4959 &test_stateid->ts_stateid_list, ts_id_list) { 4960 if (xdr_stream_encode_be32(xdr, stateid->ts_id_status) != XDR_UNIT) 4961 return nfserr_resource; 4962 } 4963 return nfs_ok; 4964 } 4965 4966 #ifdef CONFIG_NFSD_PNFS 4967 static __be32 4968 nfsd4_encode_device_addr4(struct xdr_stream *xdr, 4969 const struct nfsd4_getdeviceinfo *gdev) 4970 { 4971 u32 needed_len, starting_len = xdr->buf->len; 4972 const struct nfsd4_layout_ops *ops; 4973 __be32 status; 4974 4975 /* da_layout_type */ 4976 if (xdr_stream_encode_u32(xdr, gdev->gd_layout_type) != XDR_UNIT) 4977 return nfserr_resource; 4978 /* da_addr_body */ 4979 ops = nfsd4_layout_ops[gdev->gd_layout_type]; 4980 status = ops->encode_getdeviceinfo(xdr, gdev); 4981 if (status != nfs_ok) { 4982 /* 4983 * Don't burden the layout drivers with enforcing 4984 * gd_maxcount. Just tell the client to come back 4985 * with a bigger buffer if it's not enough. 4986 */ 4987 if (xdr->buf->len + XDR_UNIT > gdev->gd_maxcount) 4988 goto toosmall; 4989 return status; 4990 } 4991 4992 return nfs_ok; 4993 4994 toosmall: 4995 needed_len = xdr->buf->len + XDR_UNIT; /* notifications */ 4996 xdr_truncate_encode(xdr, starting_len); 4997 4998 status = nfsd4_encode_count4(xdr, needed_len); 4999 if (status != nfs_ok) 5000 return status; 5001 return nfserr_toosmall; 5002 } 5003 5004 static __be32 5005 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 5006 union nfsd4_op_u *u) 5007 { 5008 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo; 5009 struct xdr_stream *xdr = resp->xdr; 5010 5011 /* gdir_device_addr */ 5012 nfserr = nfsd4_encode_device_addr4(xdr, gdev); 5013 if (nfserr) 5014 return nfserr; 5015 /* gdir_notification */ 5016 return nfsd4_encode_bitmap4(xdr, gdev->gd_notify_types, 0, 0); 5017 } 5018 5019 static __be32 5020 nfsd4_encode_layout4(struct xdr_stream *xdr, const struct nfsd4_layoutget *lgp) 5021 { 5022 const struct nfsd4_layout_ops *ops = nfsd4_layout_ops[lgp->lg_layout_type]; 5023 __be32 status; 5024 5025 /* lo_offset */ 5026 status = nfsd4_encode_offset4(xdr, lgp->lg_seg.offset); 5027 if (status != nfs_ok) 5028 return status; 5029 /* lo_length */ 5030 status = nfsd4_encode_length4(xdr, lgp->lg_seg.length); 5031 if (status != nfs_ok) 5032 return status; 5033 /* lo_iomode */ 5034 if (xdr_stream_encode_u32(xdr, lgp->lg_seg.iomode) != XDR_UNIT) 5035 return nfserr_resource; 5036 /* lo_content */ 5037 if (xdr_stream_encode_u32(xdr, lgp->lg_layout_type) != XDR_UNIT) 5038 return nfserr_resource; 5039 return ops->encode_layoutget(xdr, lgp); 5040 } 5041 5042 static __be32 5043 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, 5044 union nfsd4_op_u *u) 5045 { 5046 struct nfsd4_layoutget *lgp = &u->layoutget; 5047 struct xdr_stream *xdr = resp->xdr; 5048 5049 /* logr_return_on_close */ 5050 nfserr = nfsd4_encode_bool(xdr, true); 5051 if (nfserr != nfs_ok) 5052 return nfserr; 5053 /* logr_stateid */ 5054 nfserr = nfsd4_encode_stateid4(xdr, &lgp->lg_sid); 5055 if (nfserr != nfs_ok) 5056 return nfserr; 5057 /* logr_layout<> */ 5058 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT) 5059 return nfserr_resource; 5060 return nfsd4_encode_layout4(xdr, lgp); 5061 } 5062 5063 static __be32 5064 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, 5065 union nfsd4_op_u *u) 5066 { 5067 struct nfsd4_layoutcommit *lcp = &u->layoutcommit; 5068 struct xdr_stream *xdr = resp->xdr; 5069 5070 /* ns_sizechanged */ 5071 nfserr = nfsd4_encode_bool(xdr, lcp->lc_size_chg); 5072 if (nfserr != nfs_ok) 5073 return nfserr; 5074 if (lcp->lc_size_chg) 5075 /* ns_size */ 5076 return nfsd4_encode_length4(xdr, lcp->lc_newsize); 5077 return nfs_ok; 5078 } 5079 5080 static __be32 5081 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr, 5082 union nfsd4_op_u *u) 5083 { 5084 struct nfsd4_layoutreturn *lrp = &u->layoutreturn; 5085 struct xdr_stream *xdr = resp->xdr; 5086 5087 /* lrs_present */ 5088 nfserr = nfsd4_encode_bool(xdr, lrp->lrs_present); 5089 if (nfserr != nfs_ok) 5090 return nfserr; 5091 if (lrp->lrs_present) 5092 /* lrs_stateid */ 5093 return nfsd4_encode_stateid4(xdr, &lrp->lr_sid); 5094 return nfs_ok; 5095 } 5096 #endif /* CONFIG_NFSD_PNFS */ 5097 5098 static __be32 5099 nfsd4_encode_write_response4(struct xdr_stream *xdr, 5100 const struct nfsd4_copy *copy) 5101 { 5102 const struct nfsd42_write_res *write = ©->cp_res; 5103 u32 count = nfsd4_copy_is_sync(copy) ? 0 : 1; 5104 __be32 status; 5105 5106 /* wr_callback_id<1> */ 5107 if (xdr_stream_encode_u32(xdr, count) != XDR_UNIT) 5108 return nfserr_resource; 5109 if (count) { 5110 status = nfsd4_encode_stateid4(xdr, &write->cb_stateid); 5111 if (status != nfs_ok) 5112 return status; 5113 } 5114 5115 /* wr_count */ 5116 status = nfsd4_encode_length4(xdr, write->wr_bytes_written); 5117 if (status != nfs_ok) 5118 return status; 5119 /* wr_committed */ 5120 if (xdr_stream_encode_u32(xdr, write->wr_stable_how) != XDR_UNIT) 5121 return nfserr_resource; 5122 /* wr_writeverf */ 5123 return nfsd4_encode_verifier4(xdr, &write->wr_verifier); 5124 } 5125 5126 static __be32 nfsd4_encode_copy_requirements4(struct xdr_stream *xdr, 5127 const struct nfsd4_copy *copy) 5128 { 5129 __be32 status; 5130 5131 /* cr_consecutive */ 5132 status = nfsd4_encode_bool(xdr, true); 5133 if (status != nfs_ok) 5134 return status; 5135 /* cr_synchronous */ 5136 return nfsd4_encode_bool(xdr, nfsd4_copy_is_sync(copy)); 5137 } 5138 5139 static __be32 5140 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr, 5141 union nfsd4_op_u *u) 5142 { 5143 struct nfsd4_copy *copy = &u->copy; 5144 5145 nfserr = nfsd4_encode_write_response4(resp->xdr, copy); 5146 if (nfserr != nfs_ok) 5147 return nfserr; 5148 return nfsd4_encode_copy_requirements4(resp->xdr, copy); 5149 } 5150 5151 static __be32 5152 nfsd4_encode_netloc4(struct xdr_stream *xdr, const struct nl4_server *ns) 5153 { 5154 __be32 status; 5155 5156 if (xdr_stream_encode_u32(xdr, ns->nl4_type) != XDR_UNIT) 5157 return nfserr_resource; 5158 switch (ns->nl4_type) { 5159 case NL4_NETADDR: 5160 /* nl_addr */ 5161 status = nfsd4_encode_netaddr4(xdr, &ns->u.nl4_addr); 5162 break; 5163 default: 5164 status = nfserr_serverfault; 5165 } 5166 return status; 5167 } 5168 5169 static __be32 5170 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr, 5171 union nfsd4_op_u *u) 5172 { 5173 struct nfsd4_copy_notify *cn = &u->copy_notify; 5174 struct xdr_stream *xdr = resp->xdr; 5175 5176 /* cnr_lease_time */ 5177 nfserr = nfsd4_encode_nfstime4(xdr, &cn->cpn_lease_time); 5178 if (nfserr) 5179 return nfserr; 5180 /* cnr_stateid */ 5181 nfserr = nfsd4_encode_stateid4(xdr, &cn->cpn_cnr_stateid); 5182 if (nfserr) 5183 return nfserr; 5184 /* cnr_source_server<> */ 5185 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT) 5186 return nfserr_resource; 5187 return nfsd4_encode_netloc4(xdr, cn->cpn_src); 5188 } 5189 5190 static __be32 5191 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr, 5192 union nfsd4_op_u *u) 5193 { 5194 struct nfsd4_offload_status *os = &u->offload_status; 5195 struct xdr_stream *xdr = resp->xdr; 5196 5197 /* osr_count */ 5198 nfserr = nfsd4_encode_length4(xdr, os->count); 5199 if (nfserr != nfs_ok) 5200 return nfserr; 5201 /* osr_complete<1> */ 5202 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT) 5203 return nfserr_resource; 5204 return nfs_ok; 5205 } 5206 5207 static __be32 5208 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp, 5209 struct nfsd4_read *read) 5210 { 5211 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp; 5212 struct file *file = read->rd_nf->nf_file; 5213 struct xdr_stream *xdr = resp->xdr; 5214 bool splice_ok = argp->splice_ok; 5215 unsigned long maxcount; 5216 __be32 nfserr, *p; 5217 5218 /* Content type, offset, byte count */ 5219 p = xdr_reserve_space(xdr, 4 + 8 + 4); 5220 if (!p) 5221 return nfserr_io; 5222 if (resp->xdr->buf->page_len && splice_ok) { 5223 WARN_ON_ONCE(splice_ok); 5224 return nfserr_serverfault; 5225 } 5226 5227 maxcount = min_t(unsigned long, read->rd_length, 5228 (xdr->buf->buflen - xdr->buf->len)); 5229 5230 if (file->f_op->splice_read && splice_ok) 5231 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 5232 else 5233 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 5234 if (nfserr) 5235 return nfserr; 5236 5237 *p++ = cpu_to_be32(NFS4_CONTENT_DATA); 5238 p = xdr_encode_hyper(p, read->rd_offset); 5239 *p = cpu_to_be32(read->rd_length); 5240 5241 return nfs_ok; 5242 } 5243 5244 static __be32 5245 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr, 5246 union nfsd4_op_u *u) 5247 { 5248 struct nfsd4_read *read = &u->read; 5249 struct file *file = read->rd_nf->nf_file; 5250 struct xdr_stream *xdr = resp->xdr; 5251 int starting_len = xdr->buf->len; 5252 u32 segments = 0; 5253 __be32 *p; 5254 5255 if (nfserr) 5256 return nfserr; 5257 5258 /* eof flag, segment count */ 5259 p = xdr_reserve_space(xdr, 4 + 4); 5260 if (!p) 5261 return nfserr_io; 5262 xdr_commit_encode(xdr); 5263 5264 read->rd_eof = read->rd_offset >= i_size_read(file_inode(file)); 5265 if (read->rd_eof) 5266 goto out; 5267 5268 nfserr = nfsd4_encode_read_plus_data(resp, read); 5269 if (nfserr) { 5270 xdr_truncate_encode(xdr, starting_len); 5271 return nfserr; 5272 } 5273 5274 segments++; 5275 5276 out: 5277 p = xdr_encode_bool(p, read->rd_eof); 5278 *p = cpu_to_be32(segments); 5279 return nfserr; 5280 } 5281 5282 static __be32 5283 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, 5284 union nfsd4_op_u *u) 5285 { 5286 struct nfsd4_seek *seek = &u->seek; 5287 struct xdr_stream *xdr = resp->xdr; 5288 5289 /* sr_eof */ 5290 nfserr = nfsd4_encode_bool(xdr, seek->seek_eof); 5291 if (nfserr != nfs_ok) 5292 return nfserr; 5293 /* sr_offset */ 5294 return nfsd4_encode_offset4(xdr, seek->seek_pos); 5295 } 5296 5297 static __be32 5298 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, 5299 union nfsd4_op_u *p) 5300 { 5301 return nfserr; 5302 } 5303 5304 /* 5305 * Encode kmalloc-ed buffer in to XDR stream. 5306 */ 5307 static __be32 5308 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen) 5309 { 5310 u32 cplen; 5311 __be32 *p; 5312 5313 cplen = min_t(unsigned long, buflen, 5314 ((void *)xdr->end - (void *)xdr->p)); 5315 p = xdr_reserve_space(xdr, cplen); 5316 if (!p) 5317 return nfserr_resource; 5318 5319 memcpy(p, buf, cplen); 5320 buf += cplen; 5321 buflen -= cplen; 5322 5323 while (buflen) { 5324 cplen = min_t(u32, buflen, PAGE_SIZE); 5325 p = xdr_reserve_space(xdr, cplen); 5326 if (!p) 5327 return nfserr_resource; 5328 5329 memcpy(p, buf, cplen); 5330 5331 if (cplen < PAGE_SIZE) { 5332 /* 5333 * We're done, with a length that wasn't page 5334 * aligned, so possibly not word aligned. Pad 5335 * any trailing bytes with 0. 5336 */ 5337 xdr_encode_opaque_fixed(p, NULL, cplen); 5338 break; 5339 } 5340 5341 buflen -= PAGE_SIZE; 5342 buf += PAGE_SIZE; 5343 } 5344 5345 return 0; 5346 } 5347 5348 static __be32 5349 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5350 union nfsd4_op_u *u) 5351 { 5352 struct nfsd4_getxattr *getxattr = &u->getxattr; 5353 struct xdr_stream *xdr = resp->xdr; 5354 __be32 *p, err; 5355 5356 p = xdr_reserve_space(xdr, 4); 5357 if (!p) 5358 return nfserr_resource; 5359 5360 *p = cpu_to_be32(getxattr->getxa_len); 5361 5362 if (getxattr->getxa_len == 0) 5363 return 0; 5364 5365 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf, 5366 getxattr->getxa_len); 5367 5368 kvfree(getxattr->getxa_buf); 5369 5370 return err; 5371 } 5372 5373 static __be32 5374 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5375 union nfsd4_op_u *u) 5376 { 5377 struct nfsd4_setxattr *setxattr = &u->setxattr; 5378 struct xdr_stream *xdr = resp->xdr; 5379 5380 return nfsd4_encode_change_info4(xdr, &setxattr->setxa_cinfo); 5381 } 5382 5383 /* 5384 * See if there are cookie values that can be rejected outright. 5385 */ 5386 static __be32 5387 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs, 5388 u32 *offsetp) 5389 { 5390 u64 cookie = listxattrs->lsxa_cookie; 5391 5392 /* 5393 * If the cookie is larger than the maximum number we can fit 5394 * in the buffer we just got back from vfs_listxattr, it's invalid. 5395 */ 5396 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2)) 5397 return nfserr_badcookie; 5398 5399 *offsetp = (u32)cookie; 5400 return 0; 5401 } 5402 5403 static __be32 5404 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr, 5405 union nfsd4_op_u *u) 5406 { 5407 struct nfsd4_listxattrs *listxattrs = &u->listxattrs; 5408 struct xdr_stream *xdr = resp->xdr; 5409 u32 cookie_offset, count_offset, eof; 5410 u32 left, xdrleft, slen, count; 5411 u32 xdrlen, offset; 5412 u64 cookie; 5413 char *sp; 5414 __be32 status, tmp; 5415 __be64 wire_cookie; 5416 __be32 *p; 5417 u32 nuser; 5418 5419 eof = 1; 5420 5421 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset); 5422 if (status) 5423 goto out; 5424 5425 /* 5426 * Reserve space for the cookie and the name array count. Record 5427 * the offsets to save them later. 5428 */ 5429 cookie_offset = xdr->buf->len; 5430 count_offset = cookie_offset + 8; 5431 p = xdr_reserve_space(xdr, XDR_UNIT * 3); 5432 if (!p) { 5433 status = nfserr_resource; 5434 goto out; 5435 } 5436 5437 count = 0; 5438 left = listxattrs->lsxa_len; 5439 sp = listxattrs->lsxa_buf; 5440 nuser = 0; 5441 5442 /* Bytes left is maxcount - 8 (cookie) - 4 (array count) */ 5443 xdrleft = listxattrs->lsxa_maxcount - XDR_UNIT * 3; 5444 5445 while (left > 0 && xdrleft > 0) { 5446 slen = strlen(sp); 5447 5448 /* 5449 * Check if this is a "user." attribute, skip it if not. 5450 */ 5451 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) 5452 goto contloop; 5453 5454 slen -= XATTR_USER_PREFIX_LEN; 5455 xdrlen = 4 + ((slen + 3) & ~3); 5456 /* Check if both entry and eof can fit in the XDR buffer */ 5457 if (xdrlen + XDR_UNIT > xdrleft) { 5458 if (count == 0) { 5459 /* 5460 * Can't even fit the first attribute name. 5461 */ 5462 status = nfserr_toosmall; 5463 goto out; 5464 } 5465 eof = 0; 5466 goto wreof; 5467 } 5468 5469 left -= XATTR_USER_PREFIX_LEN; 5470 sp += XATTR_USER_PREFIX_LEN; 5471 if (nuser++ < offset) 5472 goto contloop; 5473 5474 5475 p = xdr_reserve_space(xdr, xdrlen); 5476 if (!p) { 5477 status = nfserr_resource; 5478 goto out; 5479 } 5480 5481 xdr_encode_opaque(p, sp, slen); 5482 5483 xdrleft -= xdrlen; 5484 count++; 5485 contloop: 5486 sp += slen + 1; 5487 left -= slen + 1; 5488 } 5489 5490 /* 5491 * If there were user attributes to copy, but we didn't copy 5492 * any, the offset was too large (e.g. the cookie was invalid). 5493 */ 5494 if (nuser > 0 && count == 0) { 5495 status = nfserr_badcookie; 5496 goto out; 5497 } 5498 5499 wreof: 5500 p = xdr_reserve_space(xdr, 4); 5501 if (!p) { 5502 status = nfserr_resource; 5503 goto out; 5504 } 5505 *p = cpu_to_be32(eof); 5506 5507 cookie = offset + count; 5508 5509 wire_cookie = cpu_to_be64(cookie); 5510 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &wire_cookie, 8); 5511 tmp = cpu_to_be32(count); 5512 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4); 5513 out: 5514 if (listxattrs->lsxa_len) 5515 kvfree(listxattrs->lsxa_buf); 5516 return status; 5517 } 5518 5519 static __be32 5520 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5521 union nfsd4_op_u *u) 5522 { 5523 struct nfsd4_removexattr *removexattr = &u->removexattr; 5524 struct xdr_stream *xdr = resp->xdr; 5525 5526 return nfsd4_encode_change_info4(xdr, &removexattr->rmxa_cinfo); 5527 } 5528 5529 typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u); 5530 5531 /* 5532 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1 5533 * since we don't need to filter out obsolete ops as this is 5534 * done in the decoding phase. 5535 */ 5536 static const nfsd4_enc nfsd4_enc_ops[] = { 5537 [OP_ACCESS] = nfsd4_encode_access, 5538 [OP_CLOSE] = nfsd4_encode_close, 5539 [OP_COMMIT] = nfsd4_encode_commit, 5540 [OP_CREATE] = nfsd4_encode_create, 5541 [OP_DELEGPURGE] = nfsd4_encode_noop, 5542 [OP_DELEGRETURN] = nfsd4_encode_noop, 5543 [OP_GETATTR] = nfsd4_encode_getattr, 5544 [OP_GETFH] = nfsd4_encode_getfh, 5545 [OP_LINK] = nfsd4_encode_link, 5546 [OP_LOCK] = nfsd4_encode_lock, 5547 [OP_LOCKT] = nfsd4_encode_lockt, 5548 [OP_LOCKU] = nfsd4_encode_locku, 5549 [OP_LOOKUP] = nfsd4_encode_noop, 5550 [OP_LOOKUPP] = nfsd4_encode_noop, 5551 [OP_NVERIFY] = nfsd4_encode_noop, 5552 [OP_OPEN] = nfsd4_encode_open, 5553 [OP_OPENATTR] = nfsd4_encode_noop, 5554 [OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm, 5555 [OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade, 5556 [OP_PUTFH] = nfsd4_encode_noop, 5557 [OP_PUTPUBFH] = nfsd4_encode_noop, 5558 [OP_PUTROOTFH] = nfsd4_encode_noop, 5559 [OP_READ] = nfsd4_encode_read, 5560 [OP_READDIR] = nfsd4_encode_readdir, 5561 [OP_READLINK] = nfsd4_encode_readlink, 5562 [OP_REMOVE] = nfsd4_encode_remove, 5563 [OP_RENAME] = nfsd4_encode_rename, 5564 [OP_RENEW] = nfsd4_encode_noop, 5565 [OP_RESTOREFH] = nfsd4_encode_noop, 5566 [OP_SAVEFH] = nfsd4_encode_noop, 5567 [OP_SECINFO] = nfsd4_encode_secinfo, 5568 [OP_SETATTR] = nfsd4_encode_setattr, 5569 [OP_SETCLIENTID] = nfsd4_encode_setclientid, 5570 [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop, 5571 [OP_VERIFY] = nfsd4_encode_noop, 5572 [OP_WRITE] = nfsd4_encode_write, 5573 [OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop, 5574 5575 /* NFSv4.1 operations */ 5576 [OP_BACKCHANNEL_CTL] = nfsd4_encode_noop, 5577 [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session, 5578 [OP_EXCHANGE_ID] = nfsd4_encode_exchange_id, 5579 [OP_CREATE_SESSION] = nfsd4_encode_create_session, 5580 [OP_DESTROY_SESSION] = nfsd4_encode_noop, 5581 [OP_FREE_STATEID] = nfsd4_encode_noop, 5582 [OP_GET_DIR_DELEGATION] = nfsd4_encode_noop, 5583 #ifdef CONFIG_NFSD_PNFS 5584 [OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo, 5585 [OP_GETDEVICELIST] = nfsd4_encode_noop, 5586 [OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit, 5587 [OP_LAYOUTGET] = nfsd4_encode_layoutget, 5588 [OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn, 5589 #else 5590 [OP_GETDEVICEINFO] = nfsd4_encode_noop, 5591 [OP_GETDEVICELIST] = nfsd4_encode_noop, 5592 [OP_LAYOUTCOMMIT] = nfsd4_encode_noop, 5593 [OP_LAYOUTGET] = nfsd4_encode_noop, 5594 [OP_LAYOUTRETURN] = nfsd4_encode_noop, 5595 #endif 5596 [OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name, 5597 [OP_SEQUENCE] = nfsd4_encode_sequence, 5598 [OP_SET_SSV] = nfsd4_encode_noop, 5599 [OP_TEST_STATEID] = nfsd4_encode_test_stateid, 5600 [OP_WANT_DELEGATION] = nfsd4_encode_noop, 5601 [OP_DESTROY_CLIENTID] = nfsd4_encode_noop, 5602 [OP_RECLAIM_COMPLETE] = nfsd4_encode_noop, 5603 5604 /* NFSv4.2 operations */ 5605 [OP_ALLOCATE] = nfsd4_encode_noop, 5606 [OP_COPY] = nfsd4_encode_copy, 5607 [OP_COPY_NOTIFY] = nfsd4_encode_copy_notify, 5608 [OP_DEALLOCATE] = nfsd4_encode_noop, 5609 [OP_IO_ADVISE] = nfsd4_encode_noop, 5610 [OP_LAYOUTERROR] = nfsd4_encode_noop, 5611 [OP_LAYOUTSTATS] = nfsd4_encode_noop, 5612 [OP_OFFLOAD_CANCEL] = nfsd4_encode_noop, 5613 [OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status, 5614 [OP_READ_PLUS] = nfsd4_encode_read_plus, 5615 [OP_SEEK] = nfsd4_encode_seek, 5616 [OP_WRITE_SAME] = nfsd4_encode_noop, 5617 [OP_CLONE] = nfsd4_encode_noop, 5618 5619 /* RFC 8276 extended atributes operations */ 5620 [OP_GETXATTR] = nfsd4_encode_getxattr, 5621 [OP_SETXATTR] = nfsd4_encode_setxattr, 5622 [OP_LISTXATTRS] = nfsd4_encode_listxattrs, 5623 [OP_REMOVEXATTR] = nfsd4_encode_removexattr, 5624 }; 5625 5626 /* 5627 * Calculate whether we still have space to encode repsize bytes. 5628 * There are two considerations: 5629 * - For NFS versions >=4.1, the size of the reply must stay within 5630 * session limits 5631 * - For all NFS versions, we must stay within limited preallocated 5632 * buffer space. 5633 * 5634 * This is called before the operation is processed, so can only provide 5635 * an upper estimate. For some nonidempotent operations (such as 5636 * getattr), it's not necessarily a problem if that estimate is wrong, 5637 * as we can fail it after processing without significant side effects. 5638 */ 5639 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize) 5640 { 5641 struct xdr_buf *buf = &resp->rqstp->rq_res; 5642 struct nfsd4_slot *slot = resp->cstate.slot; 5643 5644 if (buf->len + respsize <= buf->buflen) 5645 return nfs_ok; 5646 if (!nfsd4_has_session(&resp->cstate)) 5647 return nfserr_resource; 5648 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) { 5649 WARN_ON_ONCE(1); 5650 return nfserr_rep_too_big_to_cache; 5651 } 5652 return nfserr_rep_too_big; 5653 } 5654 5655 void 5656 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 5657 { 5658 struct xdr_stream *xdr = resp->xdr; 5659 struct nfs4_stateowner *so = resp->cstate.replay_owner; 5660 struct svc_rqst *rqstp = resp->rqstp; 5661 const struct nfsd4_operation *opdesc = op->opdesc; 5662 int post_err_offset; 5663 nfsd4_enc encoder; 5664 __be32 *p; 5665 5666 p = xdr_reserve_space(xdr, 8); 5667 if (!p) 5668 goto release; 5669 *p++ = cpu_to_be32(op->opnum); 5670 post_err_offset = xdr->buf->len; 5671 5672 if (op->opnum == OP_ILLEGAL) 5673 goto status; 5674 if (op->status && opdesc && 5675 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE)) 5676 goto status; 5677 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || 5678 !nfsd4_enc_ops[op->opnum]); 5679 encoder = nfsd4_enc_ops[op->opnum]; 5680 op->status = encoder(resp, op->status, &op->u); 5681 if (op->status) 5682 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status); 5683 xdr_commit_encode(xdr); 5684 5685 /* nfsd4_check_resp_size guarantees enough room for error status */ 5686 if (!op->status) { 5687 int space_needed = 0; 5688 if (!nfsd4_last_compound_op(rqstp)) 5689 space_needed = COMPOUND_ERR_SLACK_SPACE; 5690 op->status = nfsd4_check_resp_size(resp, space_needed); 5691 } 5692 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) { 5693 struct nfsd4_slot *slot = resp->cstate.slot; 5694 5695 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) 5696 op->status = nfserr_rep_too_big_to_cache; 5697 else 5698 op->status = nfserr_rep_too_big; 5699 } 5700 if (op->status == nfserr_resource || 5701 op->status == nfserr_rep_too_big || 5702 op->status == nfserr_rep_too_big_to_cache) { 5703 /* 5704 * The operation may have already been encoded or 5705 * partially encoded. No op returns anything additional 5706 * in the case of one of these three errors, so we can 5707 * just truncate back to after the status. But it's a 5708 * bug if we had to do this on a non-idempotent op: 5709 */ 5710 warn_on_nonidempotent_op(op); 5711 xdr_truncate_encode(xdr, post_err_offset); 5712 } 5713 if (so) { 5714 int len = xdr->buf->len - post_err_offset; 5715 5716 so->so_replay.rp_status = op->status; 5717 so->so_replay.rp_buflen = len; 5718 read_bytes_from_xdr_buf(xdr->buf, post_err_offset, 5719 so->so_replay.rp_buf, len); 5720 } 5721 status: 5722 *p = op->status; 5723 release: 5724 if (opdesc && opdesc->op_release) 5725 opdesc->op_release(&op->u); 5726 5727 /* 5728 * Account for pages consumed while encoding this operation. 5729 * The xdr_stream primitives don't manage rq_next_page. 5730 */ 5731 rqstp->rq_next_page = xdr->page_ptr + 1; 5732 } 5733 5734 /** 5735 * nfsd4_encode_replay - encode a result stored in the stateowner reply cache 5736 * @xdr: send buffer's XDR stream 5737 * @op: operation being replayed 5738 * 5739 * @op->replay->rp_buf contains the previously-sent already-encoded result. 5740 */ 5741 void nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op) 5742 { 5743 struct nfs4_replay *rp = op->replay; 5744 5745 trace_nfsd_stateowner_replay(op->opnum, rp); 5746 5747 if (xdr_stream_encode_u32(xdr, op->opnum) != XDR_UNIT) 5748 return; 5749 if (xdr_stream_encode_be32(xdr, rp->rp_status) != XDR_UNIT) 5750 return; 5751 xdr_stream_encode_opaque_fixed(xdr, rp->rp_buf, rp->rp_buflen); 5752 } 5753 5754 void nfsd4_release_compoundargs(struct svc_rqst *rqstp) 5755 { 5756 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5757 5758 if (args->ops != args->iops) { 5759 vfree(args->ops); 5760 args->ops = args->iops; 5761 } 5762 while (args->to_free) { 5763 struct svcxdr_tmpbuf *tb = args->to_free; 5764 args->to_free = tb->next; 5765 kfree(tb); 5766 } 5767 } 5768 5769 bool 5770 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5771 { 5772 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5773 5774 /* svcxdr_tmp_alloc */ 5775 args->to_free = NULL; 5776 5777 args->xdr = xdr; 5778 args->ops = args->iops; 5779 args->rqstp = rqstp; 5780 5781 return nfsd4_decode_compound(args); 5782 } 5783 5784 bool 5785 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5786 { 5787 struct nfsd4_compoundres *resp = rqstp->rq_resp; 5788 __be32 *p; 5789 5790 /* 5791 * Send buffer space for the following items is reserved 5792 * at the top of nfsd4_proc_compound(). 5793 */ 5794 p = resp->statusp; 5795 5796 *p++ = resp->cstate.status; 5797 *p++ = htonl(resp->taglen); 5798 memcpy(p, resp->tag, resp->taglen); 5799 p += XDR_QUADLEN(resp->taglen); 5800 *p++ = htonl(resp->opcnt); 5801 5802 nfsd4_sequence_done(resp); 5803 return true; 5804 } 5805