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 <uapi/linux/xattr.h> 46 47 #include "idmap.h" 48 #include "acl.h" 49 #include "xdr4.h" 50 #include "vfs.h" 51 #include "state.h" 52 #include "cache.h" 53 #include "netns.h" 54 #include "pnfs.h" 55 #include "filecache.h" 56 57 #include "trace.h" 58 59 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 60 #include <linux/security.h> 61 #endif 62 63 64 #define NFSDDBG_FACILITY NFSDDBG_XDR 65 66 const u32 nfsd_suppattrs[3][3] = { 67 {NFSD4_SUPPORTED_ATTRS_WORD0, 68 NFSD4_SUPPORTED_ATTRS_WORD1, 69 NFSD4_SUPPORTED_ATTRS_WORD2}, 70 71 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 72 NFSD4_1_SUPPORTED_ATTRS_WORD1, 73 NFSD4_1_SUPPORTED_ATTRS_WORD2}, 74 75 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 76 NFSD4_1_SUPPORTED_ATTRS_WORD1, 77 NFSD4_2_SUPPORTED_ATTRS_WORD2}, 78 }; 79 80 /* 81 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing 82 * directory in order to indicate to the client that a filesystem boundary is present 83 * We use a fixed fsid for a referral 84 */ 85 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL 86 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL 87 88 static __be32 89 check_filename(char *str, int len) 90 { 91 int i; 92 93 if (len == 0) 94 return nfserr_inval; 95 if (len > NFS4_MAXNAMLEN) 96 return nfserr_nametoolong; 97 if (isdotent(str, len)) 98 return nfserr_badname; 99 for (i = 0; i < len; i++) 100 if (str[i] == '/') 101 return nfserr_badname; 102 return 0; 103 } 104 105 static int zero_clientid(clientid_t *clid) 106 { 107 return (clid->cl_boot == 0) && (clid->cl_id == 0); 108 } 109 110 /** 111 * svcxdr_tmpalloc - allocate memory to be freed after compound processing 112 * @argp: NFSv4 compound argument structure 113 * @len: length of buffer to allocate 114 * 115 * Allocates a buffer of size @len to be freed when processing the compound 116 * operation described in @argp finishes. 117 */ 118 static void * 119 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len) 120 { 121 struct svcxdr_tmpbuf *tb; 122 123 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL); 124 if (!tb) 125 return NULL; 126 tb->next = argp->to_free; 127 argp->to_free = tb; 128 return tb->buf; 129 } 130 131 /* 132 * For xdr strings that need to be passed to other kernel api's 133 * as null-terminated strings. 134 * 135 * Note null-terminating in place usually isn't safe since the 136 * buffer might end on a page boundary. 137 */ 138 static char * 139 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len) 140 { 141 char *p = svcxdr_tmpalloc(argp, len + 1); 142 143 if (!p) 144 return NULL; 145 memcpy(p, buf, len); 146 p[len] = '\0'; 147 return p; 148 } 149 150 static void * 151 svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, u32 len) 152 { 153 __be32 *tmp; 154 155 /* 156 * The location of the decoded data item is stable, 157 * so @p is OK to use. This is the common case. 158 */ 159 if (p != argp->xdr->scratch.iov_base) 160 return p; 161 162 tmp = svcxdr_tmpalloc(argp, len); 163 if (!tmp) 164 return NULL; 165 memcpy(tmp, p, len); 166 return tmp; 167 } 168 169 /* 170 * NFSv4 basic data type decoders 171 */ 172 173 /* 174 * This helper handles variable-length opaques which belong to protocol 175 * elements that this implementation does not support. 176 */ 177 static __be32 178 nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen) 179 { 180 u32 len; 181 182 if (xdr_stream_decode_u32(argp->xdr, &len) < 0) 183 return nfserr_bad_xdr; 184 if (maxlen && len > maxlen) 185 return nfserr_bad_xdr; 186 if (!xdr_inline_decode(argp->xdr, len)) 187 return nfserr_bad_xdr; 188 189 return nfs_ok; 190 } 191 192 static __be32 193 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o) 194 { 195 __be32 *p; 196 u32 len; 197 198 if (xdr_stream_decode_u32(argp->xdr, &len) < 0) 199 return nfserr_bad_xdr; 200 if (len == 0 || len > NFS4_OPAQUE_LIMIT) 201 return nfserr_bad_xdr; 202 p = xdr_inline_decode(argp->xdr, len); 203 if (!p) 204 return nfserr_bad_xdr; 205 o->data = svcxdr_savemem(argp, p, len); 206 if (!o->data) 207 return nfserr_jukebox; 208 o->len = len; 209 210 return nfs_ok; 211 } 212 213 static __be32 214 nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp) 215 { 216 __be32 *p, status; 217 218 if (xdr_stream_decode_u32(argp->xdr, lenp) < 0) 219 return nfserr_bad_xdr; 220 p = xdr_inline_decode(argp->xdr, *lenp); 221 if (!p) 222 return nfserr_bad_xdr; 223 status = check_filename((char *)p, *lenp); 224 if (status) 225 return status; 226 *namp = svcxdr_savemem(argp, p, *lenp); 227 if (!*namp) 228 return nfserr_jukebox; 229 230 return nfs_ok; 231 } 232 233 static __be32 234 nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv) 235 { 236 __be32 *p; 237 238 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3); 239 if (!p) 240 return nfserr_bad_xdr; 241 p = xdr_decode_hyper(p, &tv->tv_sec); 242 tv->tv_nsec = be32_to_cpup(p++); 243 if (tv->tv_nsec >= (u32)1000000000) 244 return nfserr_inval; 245 return nfs_ok; 246 } 247 248 static __be32 249 nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf) 250 { 251 __be32 *p; 252 253 p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE); 254 if (!p) 255 return nfserr_bad_xdr; 256 memcpy(verf->data, p, sizeof(verf->data)); 257 return nfs_ok; 258 } 259 260 /** 261 * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4 262 * @argp: NFSv4 compound argument structure 263 * @bmval: pointer to an array of u32's to decode into 264 * @bmlen: size of the @bmval array 265 * 266 * The server needs to return nfs_ok rather than nfserr_bad_xdr when 267 * encountering bitmaps containing bits it does not recognize. This 268 * includes bits in bitmap words past WORDn, where WORDn is the last 269 * bitmap WORD the implementation currently supports. Thus we are 270 * careful here to simply ignore bits in bitmap words that this 271 * implementation has yet to support explicitly. 272 * 273 * Return values: 274 * %nfs_ok: @bmval populated successfully 275 * %nfserr_bad_xdr: the encoded bitmap was invalid 276 */ 277 static __be32 278 nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen) 279 { 280 ssize_t status; 281 282 status = xdr_stream_decode_uint32_array(argp->xdr, bmval, bmlen); 283 return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok; 284 } 285 286 static __be32 287 nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace) 288 { 289 __be32 *p, status; 290 u32 length; 291 292 if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0) 293 return nfserr_bad_xdr; 294 if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0) 295 return nfserr_bad_xdr; 296 if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0) 297 return nfserr_bad_xdr; 298 299 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 300 return nfserr_bad_xdr; 301 p = xdr_inline_decode(argp->xdr, length); 302 if (!p) 303 return nfserr_bad_xdr; 304 ace->whotype = nfs4_acl_get_whotype((char *)p, length); 305 if (ace->whotype != NFS4_ACL_WHO_NAMED) 306 status = nfs_ok; 307 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 308 status = nfsd_map_name_to_gid(argp->rqstp, 309 (char *)p, length, &ace->who_gid); 310 else 311 status = nfsd_map_name_to_uid(argp->rqstp, 312 (char *)p, length, &ace->who_uid); 313 314 return status; 315 } 316 317 /* A counted array of nfsace4's */ 318 static noinline __be32 319 nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl) 320 { 321 struct nfs4_ace *ace; 322 __be32 status; 323 u32 count; 324 325 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 326 return nfserr_bad_xdr; 327 328 if (count > xdr_stream_remaining(argp->xdr) / 20) 329 /* 330 * Even with 4-byte names there wouldn't be 331 * space for that many aces; something fishy is 332 * going on: 333 */ 334 return nfserr_fbig; 335 336 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count)); 337 if (*acl == NULL) 338 return nfserr_jukebox; 339 340 (*acl)->naces = count; 341 for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) { 342 status = nfsd4_decode_nfsace4(argp, ace); 343 if (status) 344 return status; 345 } 346 347 return nfs_ok; 348 } 349 350 static noinline __be32 351 nfsd4_decode_security_label(struct nfsd4_compoundargs *argp, 352 struct xdr_netobj *label) 353 { 354 u32 lfs, pi, length; 355 __be32 *p; 356 357 if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0) 358 return nfserr_bad_xdr; 359 if (xdr_stream_decode_u32(argp->xdr, &pi) < 0) 360 return nfserr_bad_xdr; 361 362 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 363 return nfserr_bad_xdr; 364 if (length > NFS4_MAXLABELLEN) 365 return nfserr_badlabel; 366 p = xdr_inline_decode(argp->xdr, length); 367 if (!p) 368 return nfserr_bad_xdr; 369 label->len = length; 370 label->data = svcxdr_dupstr(argp, p, length); 371 if (!label->data) 372 return nfserr_jukebox; 373 374 return nfs_ok; 375 } 376 377 static __be32 378 nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen, 379 struct iattr *iattr, struct nfs4_acl **acl, 380 struct xdr_netobj *label, int *umask) 381 { 382 unsigned int starting_pos; 383 u32 attrlist4_count; 384 __be32 *p, status; 385 386 iattr->ia_valid = 0; 387 status = nfsd4_decode_bitmap4(argp, bmval, bmlen); 388 if (status) 389 return nfserr_bad_xdr; 390 391 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0 392 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1 393 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) { 394 if (nfsd_attrs_supported(argp->minorversion, bmval)) 395 return nfserr_inval; 396 return nfserr_attrnotsupp; 397 } 398 399 if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0) 400 return nfserr_bad_xdr; 401 starting_pos = xdr_stream_pos(argp->xdr); 402 403 if (bmval[0] & FATTR4_WORD0_SIZE) { 404 u64 size; 405 406 if (xdr_stream_decode_u64(argp->xdr, &size) < 0) 407 return nfserr_bad_xdr; 408 iattr->ia_size = size; 409 iattr->ia_valid |= ATTR_SIZE; 410 } 411 if (bmval[0] & FATTR4_WORD0_ACL) { 412 status = nfsd4_decode_acl(argp, acl); 413 if (status) 414 return status; 415 } else 416 *acl = NULL; 417 if (bmval[1] & FATTR4_WORD1_MODE) { 418 u32 mode; 419 420 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0) 421 return nfserr_bad_xdr; 422 iattr->ia_mode = mode; 423 iattr->ia_mode &= (S_IFMT | S_IALLUGO); 424 iattr->ia_valid |= ATTR_MODE; 425 } 426 if (bmval[1] & FATTR4_WORD1_OWNER) { 427 u32 length; 428 429 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 430 return nfserr_bad_xdr; 431 p = xdr_inline_decode(argp->xdr, length); 432 if (!p) 433 return nfserr_bad_xdr; 434 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length, 435 &iattr->ia_uid); 436 if (status) 437 return status; 438 iattr->ia_valid |= ATTR_UID; 439 } 440 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { 441 u32 length; 442 443 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 444 return nfserr_bad_xdr; 445 p = xdr_inline_decode(argp->xdr, length); 446 if (!p) 447 return nfserr_bad_xdr; 448 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length, 449 &iattr->ia_gid); 450 if (status) 451 return status; 452 iattr->ia_valid |= ATTR_GID; 453 } 454 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { 455 u32 set_it; 456 457 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0) 458 return nfserr_bad_xdr; 459 switch (set_it) { 460 case NFS4_SET_TO_CLIENT_TIME: 461 status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime); 462 if (status) 463 return status; 464 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 465 break; 466 case NFS4_SET_TO_SERVER_TIME: 467 iattr->ia_valid |= ATTR_ATIME; 468 break; 469 default: 470 return nfserr_bad_xdr; 471 } 472 } 473 if (bmval[1] & FATTR4_WORD1_TIME_CREATE) { 474 struct timespec64 ts; 475 476 /* No Linux filesystem supports setting this attribute. */ 477 bmval[1] &= ~FATTR4_WORD1_TIME_CREATE; 478 status = nfsd4_decode_nfstime4(argp, &ts); 479 if (status) 480 return status; 481 } 482 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 483 u32 set_it; 484 485 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0) 486 return nfserr_bad_xdr; 487 switch (set_it) { 488 case NFS4_SET_TO_CLIENT_TIME: 489 status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime); 490 if (status) 491 return status; 492 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 493 break; 494 case NFS4_SET_TO_SERVER_TIME: 495 iattr->ia_valid |= ATTR_MTIME; 496 break; 497 default: 498 return nfserr_bad_xdr; 499 } 500 } 501 label->len = 0; 502 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) && 503 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) { 504 status = nfsd4_decode_security_label(argp, label); 505 if (status) 506 return status; 507 } 508 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) { 509 u32 mode, mask; 510 511 if (!umask) 512 return nfserr_bad_xdr; 513 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0) 514 return nfserr_bad_xdr; 515 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO); 516 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0) 517 return nfserr_bad_xdr; 518 *umask = mask & S_IRWXUGO; 519 iattr->ia_valid |= ATTR_MODE; 520 } 521 522 /* request sanity: did attrlist4 contain the expected number of words? */ 523 if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos) 524 return nfserr_bad_xdr; 525 526 return nfs_ok; 527 } 528 529 static __be32 530 nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid) 531 { 532 __be32 *p; 533 534 p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE); 535 if (!p) 536 return nfserr_bad_xdr; 537 sid->si_generation = be32_to_cpup(p++); 538 memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque)); 539 return nfs_ok; 540 } 541 542 static __be32 543 nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid) 544 { 545 __be32 *p; 546 547 p = xdr_inline_decode(argp->xdr, sizeof(__be64)); 548 if (!p) 549 return nfserr_bad_xdr; 550 memcpy(clientid, p, sizeof(*clientid)); 551 return nfs_ok; 552 } 553 554 static __be32 555 nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp, 556 clientid_t *clientid, struct xdr_netobj *owner) 557 { 558 __be32 status; 559 560 status = nfsd4_decode_clientid4(argp, clientid); 561 if (status) 562 return status; 563 return nfsd4_decode_opaque(argp, owner); 564 } 565 566 #ifdef CONFIG_NFSD_PNFS 567 static __be32 568 nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp, 569 struct nfsd4_deviceid *devid) 570 { 571 __be32 *p; 572 573 p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE); 574 if (!p) 575 return nfserr_bad_xdr; 576 memcpy(devid, p, sizeof(*devid)); 577 return nfs_ok; 578 } 579 580 static __be32 581 nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp, 582 struct nfsd4_layoutcommit *lcp) 583 { 584 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0) 585 return nfserr_bad_xdr; 586 if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES) 587 return nfserr_bad_xdr; 588 if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX) 589 return nfserr_bad_xdr; 590 591 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0) 592 return nfserr_bad_xdr; 593 if (lcp->lc_up_len > 0) { 594 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len); 595 if (!lcp->lc_up_layout) 596 return nfserr_bad_xdr; 597 } 598 599 return nfs_ok; 600 } 601 602 static __be32 603 nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp, 604 struct nfsd4_layoutreturn *lrp) 605 { 606 __be32 status; 607 608 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0) 609 return nfserr_bad_xdr; 610 switch (lrp->lr_return_type) { 611 case RETURN_FILE: 612 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0) 613 return nfserr_bad_xdr; 614 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0) 615 return nfserr_bad_xdr; 616 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid); 617 if (status) 618 return status; 619 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0) 620 return nfserr_bad_xdr; 621 if (lrp->lrf_body_len > 0) { 622 lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len); 623 if (!lrp->lrf_body) 624 return nfserr_bad_xdr; 625 } 626 break; 627 case RETURN_FSID: 628 case RETURN_ALL: 629 lrp->lr_seg.offset = 0; 630 lrp->lr_seg.length = NFS4_MAX_UINT64; 631 break; 632 default: 633 return nfserr_bad_xdr; 634 } 635 636 return nfs_ok; 637 } 638 639 #endif /* CONFIG_NFSD_PNFS */ 640 641 static __be32 642 nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp, 643 struct nfs4_sessionid *sessionid) 644 { 645 __be32 *p; 646 647 p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN); 648 if (!p) 649 return nfserr_bad_xdr; 650 memcpy(sessionid->data, p, sizeof(sessionid->data)); 651 return nfs_ok; 652 } 653 654 /* Defined in Appendix A of RFC 5531 */ 655 static __be32 656 nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp, 657 struct nfsd4_cb_sec *cbs) 658 { 659 u32 stamp, gidcount, uid, gid; 660 __be32 *p, status; 661 662 if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0) 663 return nfserr_bad_xdr; 664 /* machine name */ 665 status = nfsd4_decode_ignored_string(argp, 255); 666 if (status) 667 return status; 668 if (xdr_stream_decode_u32(argp->xdr, &uid) < 0) 669 return nfserr_bad_xdr; 670 if (xdr_stream_decode_u32(argp->xdr, &gid) < 0) 671 return nfserr_bad_xdr; 672 if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0) 673 return nfserr_bad_xdr; 674 if (gidcount > 16) 675 return nfserr_bad_xdr; 676 p = xdr_inline_decode(argp->xdr, gidcount << 2); 677 if (!p) 678 return nfserr_bad_xdr; 679 if (cbs->flavor == (u32)(-1)) { 680 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp); 681 682 kuid_t kuid = make_kuid(userns, uid); 683 kgid_t kgid = make_kgid(userns, gid); 684 if (uid_valid(kuid) && gid_valid(kgid)) { 685 cbs->uid = kuid; 686 cbs->gid = kgid; 687 cbs->flavor = RPC_AUTH_UNIX; 688 } else { 689 dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n"); 690 } 691 } 692 693 return nfs_ok; 694 } 695 696 static __be32 697 nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp, 698 struct nfsd4_cb_sec *cbs) 699 { 700 __be32 status; 701 u32 service; 702 703 dprintk("RPC_AUTH_GSS callback secflavor not supported!\n"); 704 705 if (xdr_stream_decode_u32(argp->xdr, &service) < 0) 706 return nfserr_bad_xdr; 707 if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY) 708 return nfserr_bad_xdr; 709 /* gcbp_handle_from_server */ 710 status = nfsd4_decode_ignored_string(argp, 0); 711 if (status) 712 return status; 713 /* gcbp_handle_from_client */ 714 status = nfsd4_decode_ignored_string(argp, 0); 715 if (status) 716 return status; 717 718 return nfs_ok; 719 } 720 721 /* a counted array of callback_sec_parms4 items */ 722 static __be32 723 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs) 724 { 725 u32 i, secflavor, nr_secflavs; 726 __be32 status; 727 728 /* callback_sec_params4 */ 729 if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0) 730 return nfserr_bad_xdr; 731 if (nr_secflavs) 732 cbs->flavor = (u32)(-1); 733 else 734 /* Is this legal? Be generous, take it to mean AUTH_NONE: */ 735 cbs->flavor = 0; 736 737 for (i = 0; i < nr_secflavs; ++i) { 738 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0) 739 return nfserr_bad_xdr; 740 switch (secflavor) { 741 case RPC_AUTH_NULL: 742 /* void */ 743 if (cbs->flavor == (u32)(-1)) 744 cbs->flavor = RPC_AUTH_NULL; 745 break; 746 case RPC_AUTH_UNIX: 747 status = nfsd4_decode_authsys_parms(argp, cbs); 748 if (status) 749 return status; 750 break; 751 case RPC_AUTH_GSS: 752 status = nfsd4_decode_gss_cb_handles4(argp, cbs); 753 if (status) 754 return status; 755 break; 756 default: 757 return nfserr_inval; 758 } 759 } 760 761 return nfs_ok; 762 } 763 764 765 /* 766 * NFSv4 operation argument decoders 767 */ 768 769 static __be32 770 nfsd4_decode_access(struct nfsd4_compoundargs *argp, 771 struct nfsd4_access *access) 772 { 773 if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0) 774 return nfserr_bad_xdr; 775 return nfs_ok; 776 } 777 778 static __be32 779 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close) 780 { 781 if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0) 782 return nfserr_bad_xdr; 783 return nfsd4_decode_stateid4(argp, &close->cl_stateid); 784 } 785 786 787 static __be32 788 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit) 789 { 790 if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0) 791 return nfserr_bad_xdr; 792 if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0) 793 return nfserr_bad_xdr; 794 return nfs_ok; 795 } 796 797 static __be32 798 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) 799 { 800 __be32 *p, status; 801 802 if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0) 803 return nfserr_bad_xdr; 804 switch (create->cr_type) { 805 case NF4LNK: 806 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0) 807 return nfserr_bad_xdr; 808 p = xdr_inline_decode(argp->xdr, create->cr_datalen); 809 if (!p) 810 return nfserr_bad_xdr; 811 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen); 812 if (!create->cr_data) 813 return nfserr_jukebox; 814 break; 815 case NF4BLK: 816 case NF4CHR: 817 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0) 818 return nfserr_bad_xdr; 819 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0) 820 return nfserr_bad_xdr; 821 break; 822 case NF4SOCK: 823 case NF4FIFO: 824 case NF4DIR: 825 default: 826 break; 827 } 828 status = nfsd4_decode_component4(argp, &create->cr_name, 829 &create->cr_namelen); 830 if (status) 831 return status; 832 status = nfsd4_decode_fattr4(argp, create->cr_bmval, 833 ARRAY_SIZE(create->cr_bmval), 834 &create->cr_iattr, &create->cr_acl, 835 &create->cr_label, &create->cr_umask); 836 if (status) 837 return status; 838 839 return nfs_ok; 840 } 841 842 static inline __be32 843 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr) 844 { 845 return nfsd4_decode_stateid4(argp, &dr->dr_stateid); 846 } 847 848 static inline __be32 849 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr) 850 { 851 return nfsd4_decode_bitmap4(argp, getattr->ga_bmval, 852 ARRAY_SIZE(getattr->ga_bmval)); 853 } 854 855 static __be32 856 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link) 857 { 858 return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen); 859 } 860 861 static __be32 862 nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp, 863 struct nfsd4_lock *lock) 864 { 865 __be32 status; 866 867 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0) 868 return nfserr_bad_xdr; 869 status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid); 870 if (status) 871 return status; 872 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0) 873 return nfserr_bad_xdr; 874 return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid, 875 &lock->lk_new_owner); 876 } 877 878 static __be32 879 nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp, 880 struct nfsd4_lock *lock) 881 { 882 __be32 status; 883 884 status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid); 885 if (status) 886 return status; 887 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0) 888 return nfserr_bad_xdr; 889 890 return nfs_ok; 891 } 892 893 static __be32 894 nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 895 { 896 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0) 897 return nfserr_bad_xdr; 898 if (lock->lk_is_new) 899 return nfsd4_decode_open_to_lock_owner4(argp, lock); 900 return nfsd4_decode_exist_lock_owner4(argp, lock); 901 } 902 903 static __be32 904 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 905 { 906 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0) 907 return nfserr_bad_xdr; 908 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 909 return nfserr_bad_xdr; 910 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0) 911 return nfserr_bad_xdr; 912 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0) 913 return nfserr_bad_xdr; 914 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0) 915 return nfserr_bad_xdr; 916 return nfsd4_decode_locker4(argp, lock); 917 } 918 919 static __be32 920 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt) 921 { 922 if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0) 923 return nfserr_bad_xdr; 924 if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 925 return nfserr_bad_xdr; 926 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0) 927 return nfserr_bad_xdr; 928 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0) 929 return nfserr_bad_xdr; 930 return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid, 931 &lockt->lt_owner); 932 } 933 934 static __be32 935 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku) 936 { 937 __be32 status; 938 939 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0) 940 return nfserr_bad_xdr; 941 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 942 return nfserr_bad_xdr; 943 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0) 944 return nfserr_bad_xdr; 945 status = nfsd4_decode_stateid4(argp, &locku->lu_stateid); 946 if (status) 947 return status; 948 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0) 949 return nfserr_bad_xdr; 950 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0) 951 return nfserr_bad_xdr; 952 953 return nfs_ok; 954 } 955 956 static __be32 957 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup) 958 { 959 return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len); 960 } 961 962 static __be32 963 nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 964 { 965 __be32 status; 966 967 if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0) 968 return nfserr_bad_xdr; 969 switch (open->op_createmode) { 970 case NFS4_CREATE_UNCHECKED: 971 case NFS4_CREATE_GUARDED: 972 status = nfsd4_decode_fattr4(argp, open->op_bmval, 973 ARRAY_SIZE(open->op_bmval), 974 &open->op_iattr, &open->op_acl, 975 &open->op_label, &open->op_umask); 976 if (status) 977 return status; 978 break; 979 case NFS4_CREATE_EXCLUSIVE: 980 status = nfsd4_decode_verifier4(argp, &open->op_verf); 981 if (status) 982 return status; 983 break; 984 case NFS4_CREATE_EXCLUSIVE4_1: 985 if (argp->minorversion < 1) 986 return nfserr_bad_xdr; 987 status = nfsd4_decode_verifier4(argp, &open->op_verf); 988 if (status) 989 return status; 990 status = nfsd4_decode_fattr4(argp, open->op_bmval, 991 ARRAY_SIZE(open->op_bmval), 992 &open->op_iattr, &open->op_acl, 993 &open->op_label, &open->op_umask); 994 if (status) 995 return status; 996 break; 997 default: 998 return nfserr_bad_xdr; 999 } 1000 1001 return nfs_ok; 1002 } 1003 1004 static __be32 1005 nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 1006 { 1007 __be32 status; 1008 1009 if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0) 1010 return nfserr_bad_xdr; 1011 switch (open->op_create) { 1012 case NFS4_OPEN_NOCREATE: 1013 break; 1014 case NFS4_OPEN_CREATE: 1015 status = nfsd4_decode_createhow4(argp, open); 1016 if (status) 1017 return status; 1018 break; 1019 default: 1020 return nfserr_bad_xdr; 1021 } 1022 1023 return nfs_ok; 1024 } 1025 1026 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when) 1027 { 1028 u32 w; 1029 1030 if (xdr_stream_decode_u32(argp->xdr, &w) < 0) 1031 return nfserr_bad_xdr; 1032 *share_access = w & NFS4_SHARE_ACCESS_MASK; 1033 *deleg_want = w & NFS4_SHARE_WANT_MASK; 1034 if (deleg_when) 1035 *deleg_when = w & NFS4_SHARE_WHEN_MASK; 1036 1037 switch (w & NFS4_SHARE_ACCESS_MASK) { 1038 case NFS4_SHARE_ACCESS_READ: 1039 case NFS4_SHARE_ACCESS_WRITE: 1040 case NFS4_SHARE_ACCESS_BOTH: 1041 break; 1042 default: 1043 return nfserr_bad_xdr; 1044 } 1045 w &= ~NFS4_SHARE_ACCESS_MASK; 1046 if (!w) 1047 return nfs_ok; 1048 if (!argp->minorversion) 1049 return nfserr_bad_xdr; 1050 switch (w & NFS4_SHARE_WANT_MASK) { 1051 case NFS4_SHARE_WANT_NO_PREFERENCE: 1052 case NFS4_SHARE_WANT_READ_DELEG: 1053 case NFS4_SHARE_WANT_WRITE_DELEG: 1054 case NFS4_SHARE_WANT_ANY_DELEG: 1055 case NFS4_SHARE_WANT_NO_DELEG: 1056 case NFS4_SHARE_WANT_CANCEL: 1057 break; 1058 default: 1059 return nfserr_bad_xdr; 1060 } 1061 w &= ~NFS4_SHARE_WANT_MASK; 1062 if (!w) 1063 return nfs_ok; 1064 1065 if (!deleg_when) /* open_downgrade */ 1066 return nfserr_inval; 1067 switch (w) { 1068 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL: 1069 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED: 1070 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL | 1071 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED): 1072 return nfs_ok; 1073 } 1074 return nfserr_bad_xdr; 1075 } 1076 1077 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x) 1078 { 1079 if (xdr_stream_decode_u32(argp->xdr, x) < 0) 1080 return nfserr_bad_xdr; 1081 /* Note: unlike access bits, deny bits may be zero. */ 1082 if (*x & ~NFS4_SHARE_DENY_BOTH) 1083 return nfserr_bad_xdr; 1084 1085 return nfs_ok; 1086 } 1087 1088 static __be32 1089 nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp, 1090 struct nfsd4_open *open) 1091 { 1092 __be32 status; 1093 1094 if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0) 1095 return nfserr_bad_xdr; 1096 switch (open->op_claim_type) { 1097 case NFS4_OPEN_CLAIM_NULL: 1098 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1099 status = nfsd4_decode_component4(argp, &open->op_fname, 1100 &open->op_fnamelen); 1101 if (status) 1102 return status; 1103 break; 1104 case NFS4_OPEN_CLAIM_PREVIOUS: 1105 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0) 1106 return nfserr_bad_xdr; 1107 break; 1108 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1109 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid); 1110 if (status) 1111 return status; 1112 status = nfsd4_decode_component4(argp, &open->op_fname, 1113 &open->op_fnamelen); 1114 if (status) 1115 return status; 1116 break; 1117 case NFS4_OPEN_CLAIM_FH: 1118 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1119 if (argp->minorversion < 1) 1120 return nfserr_bad_xdr; 1121 /* void */ 1122 break; 1123 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1124 if (argp->minorversion < 1) 1125 return nfserr_bad_xdr; 1126 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid); 1127 if (status) 1128 return status; 1129 break; 1130 default: 1131 return nfserr_bad_xdr; 1132 } 1133 1134 return nfs_ok; 1135 } 1136 1137 static __be32 1138 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 1139 { 1140 __be32 status; 1141 u32 dummy; 1142 1143 memset(open->op_bmval, 0, sizeof(open->op_bmval)); 1144 open->op_iattr.ia_valid = 0; 1145 open->op_openowner = NULL; 1146 1147 open->op_xdr_error = 0; 1148 if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0) 1149 return nfserr_bad_xdr; 1150 /* deleg_want is ignored */ 1151 status = nfsd4_decode_share_access(argp, &open->op_share_access, 1152 &open->op_deleg_want, &dummy); 1153 if (status) 1154 return status; 1155 status = nfsd4_decode_share_deny(argp, &open->op_share_deny); 1156 if (status) 1157 return status; 1158 status = nfsd4_decode_state_owner4(argp, &open->op_clientid, 1159 &open->op_owner); 1160 if (status) 1161 return status; 1162 status = nfsd4_decode_openflag4(argp, open); 1163 if (status) 1164 return status; 1165 return nfsd4_decode_open_claim4(argp, open); 1166 } 1167 1168 static __be32 1169 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf) 1170 { 1171 __be32 status; 1172 1173 if (argp->minorversion >= 1) 1174 return nfserr_notsupp; 1175 1176 status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid); 1177 if (status) 1178 return status; 1179 if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0) 1180 return nfserr_bad_xdr; 1181 1182 return nfs_ok; 1183 } 1184 1185 static __be32 1186 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down) 1187 { 1188 __be32 status; 1189 1190 status = nfsd4_decode_stateid4(argp, &open_down->od_stateid); 1191 if (status) 1192 return status; 1193 if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0) 1194 return nfserr_bad_xdr; 1195 /* deleg_want is ignored */ 1196 status = nfsd4_decode_share_access(argp, &open_down->od_share_access, 1197 &open_down->od_deleg_want, NULL); 1198 if (status) 1199 return status; 1200 return nfsd4_decode_share_deny(argp, &open_down->od_share_deny); 1201 } 1202 1203 static __be32 1204 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh) 1205 { 1206 __be32 *p; 1207 1208 if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0) 1209 return nfserr_bad_xdr; 1210 if (putfh->pf_fhlen > NFS4_FHSIZE) 1211 return nfserr_bad_xdr; 1212 p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen); 1213 if (!p) 1214 return nfserr_bad_xdr; 1215 putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen); 1216 if (!putfh->pf_fhval) 1217 return nfserr_jukebox; 1218 1219 return nfs_ok; 1220 } 1221 1222 static __be32 1223 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p) 1224 { 1225 if (argp->minorversion == 0) 1226 return nfs_ok; 1227 return nfserr_notsupp; 1228 } 1229 1230 static __be32 1231 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read) 1232 { 1233 __be32 status; 1234 1235 status = nfsd4_decode_stateid4(argp, &read->rd_stateid); 1236 if (status) 1237 return status; 1238 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0) 1239 return nfserr_bad_xdr; 1240 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0) 1241 return nfserr_bad_xdr; 1242 1243 return nfs_ok; 1244 } 1245 1246 static __be32 1247 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir) 1248 { 1249 __be32 status; 1250 1251 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0) 1252 return nfserr_bad_xdr; 1253 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf); 1254 if (status) 1255 return status; 1256 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0) 1257 return nfserr_bad_xdr; 1258 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0) 1259 return nfserr_bad_xdr; 1260 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval, 1261 ARRAY_SIZE(readdir->rd_bmval)) < 0) 1262 return nfserr_bad_xdr; 1263 1264 return nfs_ok; 1265 } 1266 1267 static __be32 1268 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove) 1269 { 1270 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen); 1271 } 1272 1273 static __be32 1274 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename) 1275 { 1276 __be32 status; 1277 1278 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen); 1279 if (status) 1280 return status; 1281 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen); 1282 } 1283 1284 static __be32 1285 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid) 1286 { 1287 return nfsd4_decode_clientid4(argp, clientid); 1288 } 1289 1290 static __be32 1291 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp, 1292 struct nfsd4_secinfo *secinfo) 1293 { 1294 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen); 1295 } 1296 1297 static __be32 1298 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr) 1299 { 1300 __be32 status; 1301 1302 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid); 1303 if (status) 1304 return status; 1305 return nfsd4_decode_fattr4(argp, setattr->sa_bmval, 1306 ARRAY_SIZE(setattr->sa_bmval), 1307 &setattr->sa_iattr, &setattr->sa_acl, 1308 &setattr->sa_label, NULL); 1309 } 1310 1311 static __be32 1312 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid) 1313 { 1314 __be32 *p, status; 1315 1316 if (argp->minorversion >= 1) 1317 return nfserr_notsupp; 1318 1319 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf); 1320 if (status) 1321 return status; 1322 status = nfsd4_decode_opaque(argp, &setclientid->se_name); 1323 if (status) 1324 return status; 1325 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0) 1326 return nfserr_bad_xdr; 1327 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0) 1328 return nfserr_bad_xdr; 1329 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len); 1330 if (!p) 1331 return nfserr_bad_xdr; 1332 setclientid->se_callback_netid_val = svcxdr_savemem(argp, p, 1333 setclientid->se_callback_netid_len); 1334 if (!setclientid->se_callback_netid_val) 1335 return nfserr_jukebox; 1336 1337 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0) 1338 return nfserr_bad_xdr; 1339 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len); 1340 if (!p) 1341 return nfserr_bad_xdr; 1342 setclientid->se_callback_addr_val = svcxdr_savemem(argp, p, 1343 setclientid->se_callback_addr_len); 1344 if (!setclientid->se_callback_addr_val) 1345 return nfserr_jukebox; 1346 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0) 1347 return nfserr_bad_xdr; 1348 1349 return nfs_ok; 1350 } 1351 1352 static __be32 1353 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c) 1354 { 1355 __be32 status; 1356 1357 if (argp->minorversion >= 1) 1358 return nfserr_notsupp; 1359 1360 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid); 1361 if (status) 1362 return status; 1363 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm); 1364 } 1365 1366 /* Also used for NVERIFY */ 1367 static __be32 1368 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify) 1369 { 1370 __be32 *p, status; 1371 1372 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval, 1373 ARRAY_SIZE(verify->ve_bmval)); 1374 if (status) 1375 return status; 1376 1377 /* For convenience's sake, we compare raw xdr'd attributes in 1378 * nfsd4_proc_verify */ 1379 1380 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0) 1381 return nfserr_bad_xdr; 1382 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen); 1383 if (!p) 1384 return nfserr_bad_xdr; 1385 verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen); 1386 if (!verify->ve_attrval) 1387 return nfserr_jukebox; 1388 1389 return nfs_ok; 1390 } 1391 1392 static __be32 1393 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) 1394 { 1395 __be32 status; 1396 1397 status = nfsd4_decode_stateid4(argp, &write->wr_stateid); 1398 if (status) 1399 return status; 1400 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0) 1401 return nfserr_bad_xdr; 1402 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0) 1403 return nfserr_bad_xdr; 1404 if (write->wr_stable_how > NFS_FILE_SYNC) 1405 return nfserr_bad_xdr; 1406 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0) 1407 return nfserr_bad_xdr; 1408 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen)) 1409 return nfserr_bad_xdr; 1410 1411 return nfs_ok; 1412 } 1413 1414 static __be32 1415 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner) 1416 { 1417 __be32 status; 1418 1419 if (argp->minorversion >= 1) 1420 return nfserr_notsupp; 1421 1422 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid, 1423 &rlockowner->rl_owner); 1424 if (status) 1425 return status; 1426 1427 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid)) 1428 return nfserr_inval; 1429 1430 return nfs_ok; 1431 } 1432 1433 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc) 1434 { 1435 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0) 1436 return nfserr_bad_xdr; 1437 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec); 1438 } 1439 1440 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts) 1441 { 1442 u32 use_conn_in_rdma_mode; 1443 __be32 status; 1444 1445 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid); 1446 if (status) 1447 return status; 1448 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0) 1449 return nfserr_bad_xdr; 1450 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0) 1451 return nfserr_bad_xdr; 1452 1453 return nfs_ok; 1454 } 1455 1456 static __be32 1457 nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp, 1458 struct nfsd4_exchange_id *exid) 1459 { 1460 __be32 status; 1461 1462 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce, 1463 ARRAY_SIZE(exid->spo_must_enforce)); 1464 if (status) 1465 return nfserr_bad_xdr; 1466 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow, 1467 ARRAY_SIZE(exid->spo_must_allow)); 1468 if (status) 1469 return nfserr_bad_xdr; 1470 1471 return nfs_ok; 1472 } 1473 1474 /* 1475 * This implementation currently does not support SP4_SSV. 1476 * This decoder simply skips over these arguments. 1477 */ 1478 static noinline __be32 1479 nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp, 1480 struct nfsd4_exchange_id *exid) 1481 { 1482 u32 count, window, num_gss_handles; 1483 __be32 status; 1484 1485 /* ssp_ops */ 1486 status = nfsd4_decode_state_protect_ops(argp, exid); 1487 if (status) 1488 return status; 1489 1490 /* ssp_hash_algs<> */ 1491 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1492 return nfserr_bad_xdr; 1493 while (count--) { 1494 status = nfsd4_decode_ignored_string(argp, 0); 1495 if (status) 1496 return status; 1497 } 1498 1499 /* ssp_encr_algs<> */ 1500 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1501 return nfserr_bad_xdr; 1502 while (count--) { 1503 status = nfsd4_decode_ignored_string(argp, 0); 1504 if (status) 1505 return status; 1506 } 1507 1508 if (xdr_stream_decode_u32(argp->xdr, &window) < 0) 1509 return nfserr_bad_xdr; 1510 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0) 1511 return nfserr_bad_xdr; 1512 1513 return nfs_ok; 1514 } 1515 1516 static __be32 1517 nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp, 1518 struct nfsd4_exchange_id *exid) 1519 { 1520 __be32 status; 1521 1522 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0) 1523 return nfserr_bad_xdr; 1524 switch (exid->spa_how) { 1525 case SP4_NONE: 1526 break; 1527 case SP4_MACH_CRED: 1528 status = nfsd4_decode_state_protect_ops(argp, exid); 1529 if (status) 1530 return status; 1531 break; 1532 case SP4_SSV: 1533 status = nfsd4_decode_ssv_sp_parms(argp, exid); 1534 if (status) 1535 return status; 1536 break; 1537 default: 1538 return nfserr_bad_xdr; 1539 } 1540 1541 return nfs_ok; 1542 } 1543 1544 static __be32 1545 nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp, 1546 struct nfsd4_exchange_id *exid) 1547 { 1548 __be32 status; 1549 u32 count; 1550 1551 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1552 return nfserr_bad_xdr; 1553 switch (count) { 1554 case 0: 1555 break; 1556 case 1: 1557 /* Note that RFC 8881 places no length limit on 1558 * nii_domain, but this implementation permits no 1559 * more than NFS4_OPAQUE_LIMIT bytes */ 1560 status = nfsd4_decode_opaque(argp, &exid->nii_domain); 1561 if (status) 1562 return status; 1563 /* Note that RFC 8881 places no length limit on 1564 * nii_name, but this implementation permits no 1565 * more than NFS4_OPAQUE_LIMIT bytes */ 1566 status = nfsd4_decode_opaque(argp, &exid->nii_name); 1567 if (status) 1568 return status; 1569 status = nfsd4_decode_nfstime4(argp, &exid->nii_time); 1570 if (status) 1571 return status; 1572 break; 1573 default: 1574 return nfserr_bad_xdr; 1575 } 1576 1577 return nfs_ok; 1578 } 1579 1580 static __be32 1581 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp, 1582 struct nfsd4_exchange_id *exid) 1583 { 1584 __be32 status; 1585 1586 status = nfsd4_decode_verifier4(argp, &exid->verifier); 1587 if (status) 1588 return status; 1589 status = nfsd4_decode_opaque(argp, &exid->clname); 1590 if (status) 1591 return status; 1592 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0) 1593 return nfserr_bad_xdr; 1594 status = nfsd4_decode_state_protect4_a(argp, exid); 1595 if (status) 1596 return status; 1597 return nfsd4_decode_nfs_impl_id4(argp, exid); 1598 } 1599 1600 static __be32 1601 nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp, 1602 struct nfsd4_channel_attrs *ca) 1603 { 1604 __be32 *p; 1605 1606 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7); 1607 if (!p) 1608 return nfserr_bad_xdr; 1609 1610 /* headerpadsz is ignored */ 1611 p++; 1612 ca->maxreq_sz = be32_to_cpup(p++); 1613 ca->maxresp_sz = be32_to_cpup(p++); 1614 ca->maxresp_cached = be32_to_cpup(p++); 1615 ca->maxops = be32_to_cpup(p++); 1616 ca->maxreqs = be32_to_cpup(p++); 1617 ca->nr_rdma_attrs = be32_to_cpup(p); 1618 switch (ca->nr_rdma_attrs) { 1619 case 0: 1620 break; 1621 case 1: 1622 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0) 1623 return nfserr_bad_xdr; 1624 break; 1625 default: 1626 return nfserr_bad_xdr; 1627 } 1628 1629 return nfs_ok; 1630 } 1631 1632 static __be32 1633 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, 1634 struct nfsd4_create_session *sess) 1635 { 1636 __be32 status; 1637 1638 status = nfsd4_decode_clientid4(argp, &sess->clientid); 1639 if (status) 1640 return status; 1641 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0) 1642 return nfserr_bad_xdr; 1643 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0) 1644 return nfserr_bad_xdr; 1645 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel); 1646 if (status) 1647 return status; 1648 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel); 1649 if (status) 1650 return status; 1651 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0) 1652 return nfserr_bad_xdr; 1653 status = nfsd4_decode_cb_sec(argp, &sess->cb_sec); 1654 if (status) 1655 return status; 1656 1657 return nfs_ok; 1658 } 1659 1660 static __be32 1661 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp, 1662 struct nfsd4_destroy_session *destroy_session) 1663 { 1664 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid); 1665 } 1666 1667 static __be32 1668 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp, 1669 struct nfsd4_free_stateid *free_stateid) 1670 { 1671 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid); 1672 } 1673 1674 #ifdef CONFIG_NFSD_PNFS 1675 static __be32 1676 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp, 1677 struct nfsd4_getdeviceinfo *gdev) 1678 { 1679 __be32 status; 1680 1681 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid); 1682 if (status) 1683 return status; 1684 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0) 1685 return nfserr_bad_xdr; 1686 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0) 1687 return nfserr_bad_xdr; 1688 if (xdr_stream_decode_uint32_array(argp->xdr, 1689 &gdev->gd_notify_types, 1) < 0) 1690 return nfserr_bad_xdr; 1691 1692 return nfs_ok; 1693 } 1694 1695 static __be32 1696 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp, 1697 struct nfsd4_layoutcommit *lcp) 1698 { 1699 __be32 *p, status; 1700 1701 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0) 1702 return nfserr_bad_xdr; 1703 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0) 1704 return nfserr_bad_xdr; 1705 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0) 1706 return nfserr_bad_xdr; 1707 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid); 1708 if (status) 1709 return status; 1710 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0) 1711 return nfserr_bad_xdr; 1712 if (lcp->lc_newoffset) { 1713 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0) 1714 return nfserr_bad_xdr; 1715 } else 1716 lcp->lc_last_wr = 0; 1717 p = xdr_inline_decode(argp->xdr, XDR_UNIT); 1718 if (!p) 1719 return nfserr_bad_xdr; 1720 if (xdr_item_is_present(p)) { 1721 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime); 1722 if (status) 1723 return status; 1724 } else { 1725 lcp->lc_mtime.tv_nsec = UTIME_NOW; 1726 } 1727 return nfsd4_decode_layoutupdate4(argp, lcp); 1728 } 1729 1730 static __be32 1731 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp, 1732 struct nfsd4_layoutget *lgp) 1733 { 1734 __be32 status; 1735 1736 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0) 1737 return nfserr_bad_xdr; 1738 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0) 1739 return nfserr_bad_xdr; 1740 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0) 1741 return nfserr_bad_xdr; 1742 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0) 1743 return nfserr_bad_xdr; 1744 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0) 1745 return nfserr_bad_xdr; 1746 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0) 1747 return nfserr_bad_xdr; 1748 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid); 1749 if (status) 1750 return status; 1751 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0) 1752 return nfserr_bad_xdr; 1753 1754 return nfs_ok; 1755 } 1756 1757 static __be32 1758 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp, 1759 struct nfsd4_layoutreturn *lrp) 1760 { 1761 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0) 1762 return nfserr_bad_xdr; 1763 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0) 1764 return nfserr_bad_xdr; 1765 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0) 1766 return nfserr_bad_xdr; 1767 return nfsd4_decode_layoutreturn4(argp, lrp); 1768 } 1769 #endif /* CONFIG_NFSD_PNFS */ 1770 1771 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp, 1772 struct nfsd4_secinfo_no_name *sin) 1773 { 1774 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0) 1775 return nfserr_bad_xdr; 1776 return nfs_ok; 1777 } 1778 1779 static __be32 1780 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp, 1781 struct nfsd4_sequence *seq) 1782 { 1783 __be32 *p, status; 1784 1785 status = nfsd4_decode_sessionid4(argp, &seq->sessionid); 1786 if (status) 1787 return status; 1788 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4); 1789 if (!p) 1790 return nfserr_bad_xdr; 1791 seq->seqid = be32_to_cpup(p++); 1792 seq->slotid = be32_to_cpup(p++); 1793 seq->maxslots = be32_to_cpup(p++); 1794 seq->cachethis = be32_to_cpup(p); 1795 1796 return nfs_ok; 1797 } 1798 1799 static __be32 1800 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid) 1801 { 1802 struct nfsd4_test_stateid_id *stateid; 1803 __be32 status; 1804 u32 i; 1805 1806 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0) 1807 return nfserr_bad_xdr; 1808 1809 INIT_LIST_HEAD(&test_stateid->ts_stateid_list); 1810 for (i = 0; i < test_stateid->ts_num_ids; i++) { 1811 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); 1812 if (!stateid) 1813 return nfserr_jukebox; 1814 INIT_LIST_HEAD(&stateid->ts_id_list); 1815 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); 1816 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid); 1817 if (status) 1818 return status; 1819 } 1820 1821 return nfs_ok; 1822 } 1823 1824 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, 1825 struct nfsd4_destroy_clientid *dc) 1826 { 1827 return nfsd4_decode_clientid4(argp, &dc->clientid); 1828 } 1829 1830 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, 1831 struct nfsd4_reclaim_complete *rc) 1832 { 1833 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0) 1834 return nfserr_bad_xdr; 1835 return nfs_ok; 1836 } 1837 1838 static __be32 1839 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp, 1840 struct nfsd4_fallocate *fallocate) 1841 { 1842 __be32 status; 1843 1844 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid); 1845 if (status) 1846 return status; 1847 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0) 1848 return nfserr_bad_xdr; 1849 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0) 1850 return nfserr_bad_xdr; 1851 1852 return nfs_ok; 1853 } 1854 1855 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp, 1856 struct nl4_server *ns) 1857 { 1858 struct nfs42_netaddr *naddr; 1859 __be32 *p; 1860 1861 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0) 1862 return nfserr_bad_xdr; 1863 1864 /* currently support for 1 inter-server source server */ 1865 switch (ns->nl4_type) { 1866 case NL4_NETADDR: 1867 naddr = &ns->u.nl4_addr; 1868 1869 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0) 1870 return nfserr_bad_xdr; 1871 if (naddr->netid_len > RPCBIND_MAXNETIDLEN) 1872 return nfserr_bad_xdr; 1873 1874 p = xdr_inline_decode(argp->xdr, naddr->netid_len); 1875 if (!p) 1876 return nfserr_bad_xdr; 1877 memcpy(naddr->netid, p, naddr->netid_len); 1878 1879 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0) 1880 return nfserr_bad_xdr; 1881 if (naddr->addr_len > RPCBIND_MAXUADDRLEN) 1882 return nfserr_bad_xdr; 1883 1884 p = xdr_inline_decode(argp->xdr, naddr->addr_len); 1885 if (!p) 1886 return nfserr_bad_xdr; 1887 memcpy(naddr->addr, p, naddr->addr_len); 1888 break; 1889 default: 1890 return nfserr_bad_xdr; 1891 } 1892 1893 return nfs_ok; 1894 } 1895 1896 static __be32 1897 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy) 1898 { 1899 u32 consecutive, i, count, sync; 1900 struct nl4_server *ns_dummy; 1901 __be32 status; 1902 1903 status = nfsd4_decode_stateid4(argp, ©->cp_src_stateid); 1904 if (status) 1905 return status; 1906 status = nfsd4_decode_stateid4(argp, ©->cp_dst_stateid); 1907 if (status) 1908 return status; 1909 if (xdr_stream_decode_u64(argp->xdr, ©->cp_src_pos) < 0) 1910 return nfserr_bad_xdr; 1911 if (xdr_stream_decode_u64(argp->xdr, ©->cp_dst_pos) < 0) 1912 return nfserr_bad_xdr; 1913 if (xdr_stream_decode_u64(argp->xdr, ©->cp_count) < 0) 1914 return nfserr_bad_xdr; 1915 /* ca_consecutive: we always do consecutive copies */ 1916 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0) 1917 return nfserr_bad_xdr; 1918 if (xdr_stream_decode_bool(argp->xdr, &sync) < 0) 1919 return nfserr_bad_xdr; 1920 nfsd4_copy_set_sync(copy, sync); 1921 1922 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1923 return nfserr_bad_xdr; 1924 copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src)); 1925 if (copy->cp_src == NULL) 1926 return nfserr_jukebox; 1927 if (count == 0) { /* intra-server copy */ 1928 __set_bit(NFSD4_COPY_F_INTRA, ©->cp_flags); 1929 return nfs_ok; 1930 } 1931 1932 /* decode all the supplied server addresses but use only the first */ 1933 status = nfsd4_decode_nl4_server(argp, copy->cp_src); 1934 if (status) 1935 return status; 1936 1937 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL); 1938 if (ns_dummy == NULL) 1939 return nfserr_jukebox; 1940 for (i = 0; i < count - 1; i++) { 1941 status = nfsd4_decode_nl4_server(argp, ns_dummy); 1942 if (status) { 1943 kfree(ns_dummy); 1944 return status; 1945 } 1946 } 1947 kfree(ns_dummy); 1948 1949 return nfs_ok; 1950 } 1951 1952 static __be32 1953 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp, 1954 struct nfsd4_copy_notify *cn) 1955 { 1956 __be32 status; 1957 1958 cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src)); 1959 if (cn->cpn_src == NULL) 1960 return nfserr_jukebox; 1961 cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst)); 1962 if (cn->cpn_dst == NULL) 1963 return nfserr_jukebox; 1964 1965 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid); 1966 if (status) 1967 return status; 1968 return nfsd4_decode_nl4_server(argp, cn->cpn_dst); 1969 } 1970 1971 static __be32 1972 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp, 1973 struct nfsd4_offload_status *os) 1974 { 1975 return nfsd4_decode_stateid4(argp, &os->stateid); 1976 } 1977 1978 static __be32 1979 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek) 1980 { 1981 __be32 status; 1982 1983 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid); 1984 if (status) 1985 return status; 1986 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0) 1987 return nfserr_bad_xdr; 1988 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0) 1989 return nfserr_bad_xdr; 1990 1991 return nfs_ok; 1992 } 1993 1994 static __be32 1995 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone) 1996 { 1997 __be32 status; 1998 1999 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid); 2000 if (status) 2001 return status; 2002 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid); 2003 if (status) 2004 return status; 2005 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0) 2006 return nfserr_bad_xdr; 2007 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0) 2008 return nfserr_bad_xdr; 2009 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0) 2010 return nfserr_bad_xdr; 2011 2012 return nfs_ok; 2013 } 2014 2015 /* 2016 * XDR data that is more than PAGE_SIZE in size is normally part of a 2017 * read or write. However, the size of extended attributes is limited 2018 * by the maximum request size, and then further limited by the underlying 2019 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX 2020 * is 64k). Since there is no kvec- or page-based interface to xattrs, 2021 * and we're not dealing with contiguous pages, we need to do some copying. 2022 */ 2023 2024 /* 2025 * Decode data into buffer. 2026 */ 2027 static __be32 2028 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr, 2029 char **bufp, u32 buflen) 2030 { 2031 struct page **pages = xdr->pages; 2032 struct kvec *head = xdr->head; 2033 char *tmp, *dp; 2034 u32 len; 2035 2036 if (buflen <= head->iov_len) { 2037 /* 2038 * We're in luck, the head has enough space. Just return 2039 * the head, no need for copying. 2040 */ 2041 *bufp = head->iov_base; 2042 return 0; 2043 } 2044 2045 tmp = svcxdr_tmpalloc(argp, buflen); 2046 if (tmp == NULL) 2047 return nfserr_jukebox; 2048 2049 dp = tmp; 2050 memcpy(dp, head->iov_base, head->iov_len); 2051 buflen -= head->iov_len; 2052 dp += head->iov_len; 2053 2054 while (buflen > 0) { 2055 len = min_t(u32, buflen, PAGE_SIZE); 2056 memcpy(dp, page_address(*pages), len); 2057 2058 buflen -= len; 2059 dp += len; 2060 pages++; 2061 } 2062 2063 *bufp = tmp; 2064 return 0; 2065 } 2066 2067 /* 2068 * Get a user extended attribute name from the XDR buffer. 2069 * It will not have the "user." prefix, so prepend it. 2070 * Lastly, check for nul characters in the name. 2071 */ 2072 static __be32 2073 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep) 2074 { 2075 char *name, *sp, *dp; 2076 u32 namelen, cnt; 2077 __be32 *p; 2078 2079 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0) 2080 return nfserr_bad_xdr; 2081 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN)) 2082 return nfserr_nametoolong; 2083 if (namelen == 0) 2084 return nfserr_bad_xdr; 2085 p = xdr_inline_decode(argp->xdr, namelen); 2086 if (!p) 2087 return nfserr_bad_xdr; 2088 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1); 2089 if (!name) 2090 return nfserr_jukebox; 2091 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); 2092 2093 /* 2094 * Copy the extended attribute name over while checking for 0 2095 * characters. 2096 */ 2097 sp = (char *)p; 2098 dp = name + XATTR_USER_PREFIX_LEN; 2099 cnt = namelen; 2100 2101 while (cnt-- > 0) { 2102 if (*sp == '\0') 2103 return nfserr_bad_xdr; 2104 *dp++ = *sp++; 2105 } 2106 *dp = '\0'; 2107 2108 *namep = name; 2109 2110 return nfs_ok; 2111 } 2112 2113 /* 2114 * A GETXATTR op request comes without a length specifier. We just set the 2115 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum 2116 * channel reply size. nfsd_getxattr will probe the length of the xattr, 2117 * check it against getxa_len, and allocate + return the value. 2118 */ 2119 static __be32 2120 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp, 2121 struct nfsd4_getxattr *getxattr) 2122 { 2123 __be32 status; 2124 u32 maxcount; 2125 2126 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name); 2127 if (status) 2128 return status; 2129 2130 maxcount = svc_max_payload(argp->rqstp); 2131 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2132 2133 getxattr->getxa_len = maxcount; 2134 2135 return status; 2136 } 2137 2138 static __be32 2139 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp, 2140 struct nfsd4_setxattr *setxattr) 2141 { 2142 u32 flags, maxcount, size; 2143 __be32 status; 2144 2145 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0) 2146 return nfserr_bad_xdr; 2147 2148 if (flags > SETXATTR4_REPLACE) 2149 return nfserr_inval; 2150 setxattr->setxa_flags = flags; 2151 2152 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name); 2153 if (status) 2154 return status; 2155 2156 maxcount = svc_max_payload(argp->rqstp); 2157 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2158 2159 if (xdr_stream_decode_u32(argp->xdr, &size) < 0) 2160 return nfserr_bad_xdr; 2161 if (size > maxcount) 2162 return nfserr_xattr2big; 2163 2164 setxattr->setxa_len = size; 2165 if (size > 0) { 2166 struct xdr_buf payload; 2167 2168 if (!xdr_stream_subsegment(argp->xdr, &payload, size)) 2169 return nfserr_bad_xdr; 2170 status = nfsd4_vbuf_from_vector(argp, &payload, 2171 &setxattr->setxa_buf, size); 2172 } 2173 2174 return nfs_ok; 2175 } 2176 2177 static __be32 2178 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp, 2179 struct nfsd4_listxattrs *listxattrs) 2180 { 2181 u32 maxcount; 2182 2183 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0) 2184 return nfserr_bad_xdr; 2185 2186 /* 2187 * If the cookie is too large to have even one user.x attribute 2188 * plus trailing '\0' left in a maximum size buffer, it's invalid. 2189 */ 2190 if (listxattrs->lsxa_cookie >= 2191 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2))) 2192 return nfserr_badcookie; 2193 2194 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0) 2195 return nfserr_bad_xdr; 2196 if (maxcount < 8) 2197 /* Always need at least 2 words (length and one character) */ 2198 return nfserr_inval; 2199 2200 maxcount = min(maxcount, svc_max_payload(argp->rqstp)); 2201 listxattrs->lsxa_maxcount = maxcount; 2202 2203 return nfs_ok; 2204 } 2205 2206 static __be32 2207 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp, 2208 struct nfsd4_removexattr *removexattr) 2209 { 2210 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name); 2211 } 2212 2213 static __be32 2214 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p) 2215 { 2216 return nfs_ok; 2217 } 2218 2219 static __be32 2220 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p) 2221 { 2222 return nfserr_notsupp; 2223 } 2224 2225 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *); 2226 2227 static const nfsd4_dec nfsd4_dec_ops[] = { 2228 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access, 2229 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close, 2230 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit, 2231 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create, 2232 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp, 2233 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn, 2234 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr, 2235 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop, 2236 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link, 2237 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock, 2238 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt, 2239 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku, 2240 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup, 2241 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop, 2242 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify, 2243 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open, 2244 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp, 2245 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm, 2246 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade, 2247 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh, 2248 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh, 2249 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop, 2250 [OP_READ] = (nfsd4_dec)nfsd4_decode_read, 2251 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir, 2252 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop, 2253 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove, 2254 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename, 2255 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew, 2256 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop, 2257 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop, 2258 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo, 2259 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr, 2260 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid, 2261 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm, 2262 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify, 2263 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write, 2264 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner, 2265 2266 /* new operations for NFSv4.1 */ 2267 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl, 2268 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session, 2269 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id, 2270 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session, 2271 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session, 2272 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid, 2273 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 2274 #ifdef CONFIG_NFSD_PNFS 2275 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo, 2276 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 2277 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit, 2278 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget, 2279 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn, 2280 #else 2281 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp, 2282 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 2283 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp, 2284 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp, 2285 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp, 2286 #endif 2287 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name, 2288 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence, 2289 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp, 2290 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid, 2291 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 2292 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid, 2293 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete, 2294 2295 /* new operations for NFSv4.2 */ 2296 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 2297 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy, 2298 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_copy_notify, 2299 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 2300 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp, 2301 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp, 2302 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp, 2303 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_offload_status, 2304 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_offload_status, 2305 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_read, 2306 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek, 2307 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp, 2308 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone, 2309 /* RFC 8276 extended atributes operations */ 2310 [OP_GETXATTR] = (nfsd4_dec)nfsd4_decode_getxattr, 2311 [OP_SETXATTR] = (nfsd4_dec)nfsd4_decode_setxattr, 2312 [OP_LISTXATTRS] = (nfsd4_dec)nfsd4_decode_listxattrs, 2313 [OP_REMOVEXATTR] = (nfsd4_dec)nfsd4_decode_removexattr, 2314 }; 2315 2316 static inline bool 2317 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op) 2318 { 2319 if (op->opnum < FIRST_NFS4_OP) 2320 return false; 2321 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP) 2322 return false; 2323 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP) 2324 return false; 2325 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP) 2326 return false; 2327 return true; 2328 } 2329 2330 static bool 2331 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 2332 { 2333 struct nfsd4_op *op; 2334 bool cachethis = false; 2335 int auth_slack= argp->rqstp->rq_auth_slack; 2336 int max_reply = auth_slack + 8; /* opcnt, status */ 2337 int readcount = 0; 2338 int readbytes = 0; 2339 __be32 *p; 2340 int i; 2341 2342 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0) 2343 return false; 2344 max_reply += XDR_UNIT; 2345 argp->tag = NULL; 2346 if (unlikely(argp->taglen)) { 2347 if (argp->taglen > NFSD4_MAX_TAGLEN) 2348 return false; 2349 p = xdr_inline_decode(argp->xdr, argp->taglen); 2350 if (!p) 2351 return false; 2352 argp->tag = svcxdr_savemem(argp, p, argp->taglen); 2353 if (!argp->tag) 2354 return false; 2355 max_reply += xdr_align_size(argp->taglen); 2356 } 2357 2358 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0) 2359 return false; 2360 if (xdr_stream_decode_u32(argp->xdr, &argp->opcnt) < 0) 2361 return false; 2362 2363 /* 2364 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS 2365 * here, so we return success at the xdr level so that 2366 * nfsd4_proc can handle this is an NFS-level error. 2367 */ 2368 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND) 2369 return true; 2370 2371 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { 2372 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); 2373 if (!argp->ops) { 2374 argp->ops = argp->iops; 2375 dprintk("nfsd: couldn't allocate room for COMPOUND\n"); 2376 return false; 2377 } 2378 } 2379 2380 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 2381 argp->opcnt = 0; 2382 2383 for (i = 0; i < argp->opcnt; i++) { 2384 op = &argp->ops[i]; 2385 op->replay = NULL; 2386 2387 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0) 2388 return false; 2389 if (nfsd4_opnum_in_range(argp, op)) { 2390 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u); 2391 if (op->status != nfs_ok) 2392 trace_nfsd_compound_decode_err(argp->rqstp, 2393 argp->opcnt, i, 2394 op->opnum, 2395 op->status); 2396 } else { 2397 op->opnum = OP_ILLEGAL; 2398 op->status = nfserr_op_illegal; 2399 } 2400 op->opdesc = OPDESC(op); 2401 /* 2402 * We'll try to cache the result in the DRC if any one 2403 * op in the compound wants to be cached: 2404 */ 2405 cachethis |= nfsd4_cache_this_op(op); 2406 2407 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) { 2408 readcount++; 2409 readbytes += nfsd4_max_reply(argp->rqstp, op); 2410 } else 2411 max_reply += nfsd4_max_reply(argp->rqstp, op); 2412 /* 2413 * OP_LOCK and OP_LOCKT may return a conflicting lock. 2414 * (Special case because it will just skip encoding this 2415 * if it runs out of xdr buffer space, and it is the only 2416 * operation that behaves this way.) 2417 */ 2418 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT) 2419 max_reply += NFS4_OPAQUE_LIMIT; 2420 2421 if (op->status) { 2422 argp->opcnt = i+1; 2423 break; 2424 } 2425 } 2426 /* Sessions make the DRC unnecessary: */ 2427 if (argp->minorversion) 2428 cachethis = false; 2429 svc_reserve(argp->rqstp, max_reply + readbytes); 2430 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE; 2431 2432 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack) 2433 __clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags); 2434 2435 return true; 2436 } 2437 2438 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode, 2439 struct svc_export *exp) 2440 { 2441 if (exp->ex_flags & NFSEXP_V4ROOT) { 2442 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time)); 2443 *p++ = 0; 2444 } else 2445 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode)); 2446 return p; 2447 } 2448 2449 /* 2450 * ctime (in NFSv4, time_metadata) is not writeable, and the client 2451 * doesn't really care what resolution could theoretically be stored by 2452 * the filesystem. 2453 * 2454 * The client cares how close together changes can be while still 2455 * guaranteeing ctime changes. For most filesystems (which have 2456 * timestamps with nanosecond fields) that is limited by the resolution 2457 * of the time returned from current_time() (which I'm assuming to be 2458 * 1/HZ). 2459 */ 2460 static __be32 *encode_time_delta(__be32 *p, struct inode *inode) 2461 { 2462 struct timespec64 ts; 2463 u32 ns; 2464 2465 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran); 2466 ts = ns_to_timespec64(ns); 2467 2468 p = xdr_encode_hyper(p, ts.tv_sec); 2469 *p++ = cpu_to_be32(ts.tv_nsec); 2470 2471 return p; 2472 } 2473 2474 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c) 2475 { 2476 *p++ = cpu_to_be32(c->atomic); 2477 p = xdr_encode_hyper(p, c->before_change); 2478 p = xdr_encode_hyper(p, c->after_change); 2479 return p; 2480 } 2481 2482 /* Encode as an array of strings the string given with components 2483 * separated @sep, escaped with esc_enter and esc_exit. 2484 */ 2485 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep, 2486 char *components, char esc_enter, 2487 char esc_exit) 2488 { 2489 __be32 *p; 2490 __be32 pathlen; 2491 int pathlen_offset; 2492 int strlen, count=0; 2493 char *str, *end, *next; 2494 2495 dprintk("nfsd4_encode_components(%s)\n", components); 2496 2497 pathlen_offset = xdr->buf->len; 2498 p = xdr_reserve_space(xdr, 4); 2499 if (!p) 2500 return nfserr_resource; 2501 p++; /* We will fill this in with @count later */ 2502 2503 end = str = components; 2504 while (*end) { 2505 bool found_esc = false; 2506 2507 /* try to parse as esc_start, ..., esc_end, sep */ 2508 if (*str == esc_enter) { 2509 for (; *end && (*end != esc_exit); end++) 2510 /* find esc_exit or end of string */; 2511 next = end + 1; 2512 if (*end && (!*next || *next == sep)) { 2513 str++; 2514 found_esc = true; 2515 } 2516 } 2517 2518 if (!found_esc) 2519 for (; *end && (*end != sep); end++) 2520 /* find sep or end of string */; 2521 2522 strlen = end - str; 2523 if (strlen) { 2524 p = xdr_reserve_space(xdr, strlen + 4); 2525 if (!p) 2526 return nfserr_resource; 2527 p = xdr_encode_opaque(p, str, strlen); 2528 count++; 2529 } 2530 else 2531 end++; 2532 if (found_esc) 2533 end = next; 2534 2535 str = end; 2536 } 2537 pathlen = htonl(count); 2538 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4); 2539 return 0; 2540 } 2541 2542 /* Encode as an array of strings the string given with components 2543 * separated @sep. 2544 */ 2545 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep, 2546 char *components) 2547 { 2548 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0); 2549 } 2550 2551 /* 2552 * encode a location element of a fs_locations structure 2553 */ 2554 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr, 2555 struct nfsd4_fs_location *location) 2556 { 2557 __be32 status; 2558 2559 status = nfsd4_encode_components_esc(xdr, ':', location->hosts, 2560 '[', ']'); 2561 if (status) 2562 return status; 2563 status = nfsd4_encode_components(xdr, '/', location->path); 2564 if (status) 2565 return status; 2566 return 0; 2567 } 2568 2569 /* 2570 * Encode a path in RFC3530 'pathname4' format 2571 */ 2572 static __be32 nfsd4_encode_path(struct xdr_stream *xdr, 2573 const struct path *root, 2574 const struct path *path) 2575 { 2576 struct path cur = *path; 2577 __be32 *p; 2578 struct dentry **components = NULL; 2579 unsigned int ncomponents = 0; 2580 __be32 err = nfserr_jukebox; 2581 2582 dprintk("nfsd4_encode_components("); 2583 2584 path_get(&cur); 2585 /* First walk the path up to the nfsd root, and store the 2586 * dentries/path components in an array. 2587 */ 2588 for (;;) { 2589 if (path_equal(&cur, root)) 2590 break; 2591 if (cur.dentry == cur.mnt->mnt_root) { 2592 if (follow_up(&cur)) 2593 continue; 2594 goto out_free; 2595 } 2596 if ((ncomponents & 15) == 0) { 2597 struct dentry **new; 2598 new = krealloc(components, 2599 sizeof(*new) * (ncomponents + 16), 2600 GFP_KERNEL); 2601 if (!new) 2602 goto out_free; 2603 components = new; 2604 } 2605 components[ncomponents++] = cur.dentry; 2606 cur.dentry = dget_parent(cur.dentry); 2607 } 2608 err = nfserr_resource; 2609 p = xdr_reserve_space(xdr, 4); 2610 if (!p) 2611 goto out_free; 2612 *p++ = cpu_to_be32(ncomponents); 2613 2614 while (ncomponents) { 2615 struct dentry *dentry = components[ncomponents - 1]; 2616 unsigned int len; 2617 2618 spin_lock(&dentry->d_lock); 2619 len = dentry->d_name.len; 2620 p = xdr_reserve_space(xdr, len + 4); 2621 if (!p) { 2622 spin_unlock(&dentry->d_lock); 2623 goto out_free; 2624 } 2625 p = xdr_encode_opaque(p, dentry->d_name.name, len); 2626 dprintk("/%pd", dentry); 2627 spin_unlock(&dentry->d_lock); 2628 dput(dentry); 2629 ncomponents--; 2630 } 2631 2632 err = 0; 2633 out_free: 2634 dprintk(")\n"); 2635 while (ncomponents) 2636 dput(components[--ncomponents]); 2637 kfree(components); 2638 path_put(&cur); 2639 return err; 2640 } 2641 2642 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr, 2643 struct svc_rqst *rqstp, const struct path *path) 2644 { 2645 struct svc_export *exp_ps; 2646 __be32 res; 2647 2648 exp_ps = rqst_find_fsidzero_export(rqstp); 2649 if (IS_ERR(exp_ps)) 2650 return nfserrno(PTR_ERR(exp_ps)); 2651 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path); 2652 exp_put(exp_ps); 2653 return res; 2654 } 2655 2656 /* 2657 * encode a fs_locations structure 2658 */ 2659 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr, 2660 struct svc_rqst *rqstp, struct svc_export *exp) 2661 { 2662 __be32 status; 2663 int i; 2664 __be32 *p; 2665 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; 2666 2667 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path); 2668 if (status) 2669 return status; 2670 p = xdr_reserve_space(xdr, 4); 2671 if (!p) 2672 return nfserr_resource; 2673 *p++ = cpu_to_be32(fslocs->locations_count); 2674 for (i=0; i<fslocs->locations_count; i++) { 2675 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]); 2676 if (status) 2677 return status; 2678 } 2679 return 0; 2680 } 2681 2682 static u32 nfs4_file_type(umode_t mode) 2683 { 2684 switch (mode & S_IFMT) { 2685 case S_IFIFO: return NF4FIFO; 2686 case S_IFCHR: return NF4CHR; 2687 case S_IFDIR: return NF4DIR; 2688 case S_IFBLK: return NF4BLK; 2689 case S_IFLNK: return NF4LNK; 2690 case S_IFREG: return NF4REG; 2691 case S_IFSOCK: return NF4SOCK; 2692 default: return NF4BAD; 2693 } 2694 } 2695 2696 static inline __be32 2697 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2698 struct nfs4_ace *ace) 2699 { 2700 if (ace->whotype != NFS4_ACL_WHO_NAMED) 2701 return nfs4_acl_write_who(xdr, ace->whotype); 2702 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 2703 return nfsd4_encode_group(xdr, rqstp, ace->who_gid); 2704 else 2705 return nfsd4_encode_user(xdr, rqstp, ace->who_uid); 2706 } 2707 2708 static inline __be32 2709 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types) 2710 { 2711 __be32 *p; 2712 unsigned long i = hweight_long(layout_types); 2713 2714 p = xdr_reserve_space(xdr, 4 + 4 * i); 2715 if (!p) 2716 return nfserr_resource; 2717 2718 *p++ = cpu_to_be32(i); 2719 2720 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 2721 if (layout_types & (1 << i)) 2722 *p++ = cpu_to_be32(i); 2723 2724 return 0; 2725 } 2726 2727 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ 2728 FATTR4_WORD0_RDATTR_ERROR) 2729 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID 2730 #define WORD2_ABSENT_FS_ATTRS 0 2731 2732 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2733 static inline __be32 2734 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2735 void *context, int len) 2736 { 2737 __be32 *p; 2738 2739 p = xdr_reserve_space(xdr, len + 4 + 4 + 4); 2740 if (!p) 2741 return nfserr_resource; 2742 2743 /* 2744 * For now we use a 0 here to indicate the null translation; in 2745 * the future we may place a call to translation code here. 2746 */ 2747 *p++ = cpu_to_be32(0); /* lfs */ 2748 *p++ = cpu_to_be32(0); /* pi */ 2749 p = xdr_encode_opaque(p, context, len); 2750 return 0; 2751 } 2752 #else 2753 static inline __be32 2754 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2755 void *context, int len) 2756 { return 0; } 2757 #endif 2758 2759 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err) 2760 { 2761 /* As per referral draft: */ 2762 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || 2763 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { 2764 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || 2765 *bmval0 & FATTR4_WORD0_FS_LOCATIONS) 2766 *rdattr_err = NFSERR_MOVED; 2767 else 2768 return nfserr_moved; 2769 } 2770 *bmval0 &= WORD0_ABSENT_FS_ATTRS; 2771 *bmval1 &= WORD1_ABSENT_FS_ATTRS; 2772 *bmval2 &= WORD2_ABSENT_FS_ATTRS; 2773 return 0; 2774 } 2775 2776 2777 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat) 2778 { 2779 struct path path = exp->ex_path; 2780 int err; 2781 2782 path_get(&path); 2783 while (follow_up(&path)) { 2784 if (path.dentry != path.mnt->mnt_root) 2785 break; 2786 } 2787 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2788 path_put(&path); 2789 return err; 2790 } 2791 2792 static __be32 2793 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2) 2794 { 2795 __be32 *p; 2796 2797 if (bmval2) { 2798 p = xdr_reserve_space(xdr, 16); 2799 if (!p) 2800 goto out_resource; 2801 *p++ = cpu_to_be32(3); 2802 *p++ = cpu_to_be32(bmval0); 2803 *p++ = cpu_to_be32(bmval1); 2804 *p++ = cpu_to_be32(bmval2); 2805 } else if (bmval1) { 2806 p = xdr_reserve_space(xdr, 12); 2807 if (!p) 2808 goto out_resource; 2809 *p++ = cpu_to_be32(2); 2810 *p++ = cpu_to_be32(bmval0); 2811 *p++ = cpu_to_be32(bmval1); 2812 } else { 2813 p = xdr_reserve_space(xdr, 8); 2814 if (!p) 2815 goto out_resource; 2816 *p++ = cpu_to_be32(1); 2817 *p++ = cpu_to_be32(bmval0); 2818 } 2819 2820 return 0; 2821 out_resource: 2822 return nfserr_resource; 2823 } 2824 2825 /* 2826 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 2827 * ourselves. 2828 */ 2829 static __be32 2830 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, 2831 struct svc_export *exp, 2832 struct dentry *dentry, u32 *bmval, 2833 struct svc_rqst *rqstp, int ignore_crossmnt) 2834 { 2835 u32 bmval0 = bmval[0]; 2836 u32 bmval1 = bmval[1]; 2837 u32 bmval2 = bmval[2]; 2838 struct kstat stat; 2839 struct svc_fh *tempfh = NULL; 2840 struct kstatfs statfs; 2841 __be32 *p, *attrlen_p; 2842 int starting_len = xdr->buf->len; 2843 int attrlen_offset; 2844 u32 dummy; 2845 u64 dummy64; 2846 u32 rdattr_err = 0; 2847 __be32 status; 2848 int err; 2849 struct nfs4_acl *acl = NULL; 2850 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2851 void *context = NULL; 2852 int contextlen; 2853 #endif 2854 bool contextsupport = false; 2855 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2856 u32 minorversion = resp->cstate.minorversion; 2857 struct path path = { 2858 .mnt = exp->ex_path.mnt, 2859 .dentry = dentry, 2860 }; 2861 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2862 2863 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); 2864 BUG_ON(!nfsd_attrs_supported(minorversion, bmval)); 2865 2866 if (exp->ex_fslocs.migrated) { 2867 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err); 2868 if (status) 2869 goto out; 2870 } 2871 2872 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2873 if (err) 2874 goto out_nfserr; 2875 if (!(stat.result_mask & STATX_BTIME)) 2876 /* underlying FS does not offer btime so we can't share it */ 2877 bmval1 &= ~FATTR4_WORD1_TIME_CREATE; 2878 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE | 2879 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || 2880 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 2881 FATTR4_WORD1_SPACE_TOTAL))) { 2882 err = vfs_statfs(&path, &statfs); 2883 if (err) 2884 goto out_nfserr; 2885 } 2886 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { 2887 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); 2888 status = nfserr_jukebox; 2889 if (!tempfh) 2890 goto out; 2891 fh_init(tempfh, NFS4_FHSIZE); 2892 status = fh_compose(tempfh, exp, dentry, NULL); 2893 if (status) 2894 goto out; 2895 fhp = tempfh; 2896 } 2897 if (bmval0 & FATTR4_WORD0_ACL) { 2898 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); 2899 if (err == -EOPNOTSUPP) 2900 bmval0 &= ~FATTR4_WORD0_ACL; 2901 else if (err == -EINVAL) { 2902 status = nfserr_attrnotsupp; 2903 goto out; 2904 } else if (err != 0) 2905 goto out_nfserr; 2906 } 2907 2908 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2909 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) || 2910 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2911 if (exp->ex_flags & NFSEXP_SECURITY_LABEL) 2912 err = security_inode_getsecctx(d_inode(dentry), 2913 &context, &contextlen); 2914 else 2915 err = -EOPNOTSUPP; 2916 contextsupport = (err == 0); 2917 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2918 if (err == -EOPNOTSUPP) 2919 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL; 2920 else if (err) 2921 goto out_nfserr; 2922 } 2923 } 2924 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2925 2926 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2); 2927 if (status) 2928 goto out; 2929 2930 attrlen_offset = xdr->buf->len; 2931 attrlen_p = xdr_reserve_space(xdr, XDR_UNIT); 2932 if (!attrlen_p) 2933 goto out_resource; 2934 2935 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2936 u32 supp[3]; 2937 2938 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2939 2940 if (!IS_POSIXACL(dentry->d_inode)) 2941 supp[0] &= ~FATTR4_WORD0_ACL; 2942 if (!contextsupport) 2943 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2944 if (!supp[2]) { 2945 p = xdr_reserve_space(xdr, 12); 2946 if (!p) 2947 goto out_resource; 2948 *p++ = cpu_to_be32(2); 2949 *p++ = cpu_to_be32(supp[0]); 2950 *p++ = cpu_to_be32(supp[1]); 2951 } else { 2952 p = xdr_reserve_space(xdr, 16); 2953 if (!p) 2954 goto out_resource; 2955 *p++ = cpu_to_be32(3); 2956 *p++ = cpu_to_be32(supp[0]); 2957 *p++ = cpu_to_be32(supp[1]); 2958 *p++ = cpu_to_be32(supp[2]); 2959 } 2960 } 2961 if (bmval0 & FATTR4_WORD0_TYPE) { 2962 p = xdr_reserve_space(xdr, 4); 2963 if (!p) 2964 goto out_resource; 2965 dummy = nfs4_file_type(stat.mode); 2966 if (dummy == NF4BAD) { 2967 status = nfserr_serverfault; 2968 goto out; 2969 } 2970 *p++ = cpu_to_be32(dummy); 2971 } 2972 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { 2973 p = xdr_reserve_space(xdr, 4); 2974 if (!p) 2975 goto out_resource; 2976 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 2977 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT); 2978 else 2979 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT| 2980 NFS4_FH_VOL_RENAME); 2981 } 2982 if (bmval0 & FATTR4_WORD0_CHANGE) { 2983 p = xdr_reserve_space(xdr, 8); 2984 if (!p) 2985 goto out_resource; 2986 p = encode_change(p, &stat, d_inode(dentry), exp); 2987 } 2988 if (bmval0 & FATTR4_WORD0_SIZE) { 2989 p = xdr_reserve_space(xdr, 8); 2990 if (!p) 2991 goto out_resource; 2992 p = xdr_encode_hyper(p, stat.size); 2993 } 2994 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { 2995 p = xdr_reserve_space(xdr, 4); 2996 if (!p) 2997 goto out_resource; 2998 *p++ = cpu_to_be32(1); 2999 } 3000 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { 3001 p = xdr_reserve_space(xdr, 4); 3002 if (!p) 3003 goto out_resource; 3004 *p++ = cpu_to_be32(1); 3005 } 3006 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { 3007 p = xdr_reserve_space(xdr, 4); 3008 if (!p) 3009 goto out_resource; 3010 *p++ = cpu_to_be32(0); 3011 } 3012 if (bmval0 & FATTR4_WORD0_FSID) { 3013 p = xdr_reserve_space(xdr, 16); 3014 if (!p) 3015 goto out_resource; 3016 if (exp->ex_fslocs.migrated) { 3017 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR); 3018 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR); 3019 } else switch(fsid_source(fhp)) { 3020 case FSIDSOURCE_FSID: 3021 p = xdr_encode_hyper(p, (u64)exp->ex_fsid); 3022 p = xdr_encode_hyper(p, (u64)0); 3023 break; 3024 case FSIDSOURCE_DEV: 3025 *p++ = cpu_to_be32(0); 3026 *p++ = cpu_to_be32(MAJOR(stat.dev)); 3027 *p++ = cpu_to_be32(0); 3028 *p++ = cpu_to_be32(MINOR(stat.dev)); 3029 break; 3030 case FSIDSOURCE_UUID: 3031 p = xdr_encode_opaque_fixed(p, exp->ex_uuid, 3032 EX_UUID_LEN); 3033 break; 3034 } 3035 } 3036 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { 3037 p = xdr_reserve_space(xdr, 4); 3038 if (!p) 3039 goto out_resource; 3040 *p++ = cpu_to_be32(0); 3041 } 3042 if (bmval0 & FATTR4_WORD0_LEASE_TIME) { 3043 p = xdr_reserve_space(xdr, 4); 3044 if (!p) 3045 goto out_resource; 3046 *p++ = cpu_to_be32(nn->nfsd4_lease); 3047 } 3048 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { 3049 p = xdr_reserve_space(xdr, 4); 3050 if (!p) 3051 goto out_resource; 3052 *p++ = cpu_to_be32(rdattr_err); 3053 } 3054 if (bmval0 & FATTR4_WORD0_ACL) { 3055 struct nfs4_ace *ace; 3056 3057 if (acl == NULL) { 3058 p = xdr_reserve_space(xdr, 4); 3059 if (!p) 3060 goto out_resource; 3061 3062 *p++ = cpu_to_be32(0); 3063 goto out_acl; 3064 } 3065 p = xdr_reserve_space(xdr, 4); 3066 if (!p) 3067 goto out_resource; 3068 *p++ = cpu_to_be32(acl->naces); 3069 3070 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 3071 p = xdr_reserve_space(xdr, 4*3); 3072 if (!p) 3073 goto out_resource; 3074 *p++ = cpu_to_be32(ace->type); 3075 *p++ = cpu_to_be32(ace->flag); 3076 *p++ = cpu_to_be32(ace->access_mask & 3077 NFS4_ACE_MASK_ALL); 3078 status = nfsd4_encode_aclname(xdr, rqstp, ace); 3079 if (status) 3080 goto out; 3081 } 3082 } 3083 out_acl: 3084 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { 3085 p = xdr_reserve_space(xdr, 4); 3086 if (!p) 3087 goto out_resource; 3088 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ? 3089 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); 3090 } 3091 if (bmval0 & FATTR4_WORD0_CANSETTIME) { 3092 p = xdr_reserve_space(xdr, 4); 3093 if (!p) 3094 goto out_resource; 3095 *p++ = cpu_to_be32(1); 3096 } 3097 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { 3098 p = xdr_reserve_space(xdr, 4); 3099 if (!p) 3100 goto out_resource; 3101 *p++ = cpu_to_be32(0); 3102 } 3103 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { 3104 p = xdr_reserve_space(xdr, 4); 3105 if (!p) 3106 goto out_resource; 3107 *p++ = cpu_to_be32(1); 3108 } 3109 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { 3110 p = xdr_reserve_space(xdr, 4); 3111 if (!p) 3112 goto out_resource; 3113 *p++ = cpu_to_be32(1); 3114 } 3115 if (bmval0 & FATTR4_WORD0_FILEHANDLE) { 3116 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4); 3117 if (!p) 3118 goto out_resource; 3119 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, 3120 fhp->fh_handle.fh_size); 3121 } 3122 if (bmval0 & FATTR4_WORD0_FILEID) { 3123 p = xdr_reserve_space(xdr, 8); 3124 if (!p) 3125 goto out_resource; 3126 p = xdr_encode_hyper(p, stat.ino); 3127 } 3128 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { 3129 p = xdr_reserve_space(xdr, 8); 3130 if (!p) 3131 goto out_resource; 3132 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 3133 } 3134 if (bmval0 & FATTR4_WORD0_FILES_FREE) { 3135 p = xdr_reserve_space(xdr, 8); 3136 if (!p) 3137 goto out_resource; 3138 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 3139 } 3140 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { 3141 p = xdr_reserve_space(xdr, 8); 3142 if (!p) 3143 goto out_resource; 3144 p = xdr_encode_hyper(p, (u64) statfs.f_files); 3145 } 3146 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) { 3147 status = nfsd4_encode_fs_locations(xdr, rqstp, exp); 3148 if (status) 3149 goto out; 3150 } 3151 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { 3152 p = xdr_reserve_space(xdr, 4); 3153 if (!p) 3154 goto out_resource; 3155 *p++ = cpu_to_be32(1); 3156 } 3157 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { 3158 p = xdr_reserve_space(xdr, 8); 3159 if (!p) 3160 goto out_resource; 3161 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes); 3162 } 3163 if (bmval0 & FATTR4_WORD0_MAXLINK) { 3164 p = xdr_reserve_space(xdr, 4); 3165 if (!p) 3166 goto out_resource; 3167 *p++ = cpu_to_be32(255); 3168 } 3169 if (bmval0 & FATTR4_WORD0_MAXNAME) { 3170 p = xdr_reserve_space(xdr, 4); 3171 if (!p) 3172 goto out_resource; 3173 *p++ = cpu_to_be32(statfs.f_namelen); 3174 } 3175 if (bmval0 & FATTR4_WORD0_MAXREAD) { 3176 p = xdr_reserve_space(xdr, 8); 3177 if (!p) 3178 goto out_resource; 3179 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 3180 } 3181 if (bmval0 & FATTR4_WORD0_MAXWRITE) { 3182 p = xdr_reserve_space(xdr, 8); 3183 if (!p) 3184 goto out_resource; 3185 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 3186 } 3187 if (bmval1 & FATTR4_WORD1_MODE) { 3188 p = xdr_reserve_space(xdr, 4); 3189 if (!p) 3190 goto out_resource; 3191 *p++ = cpu_to_be32(stat.mode & S_IALLUGO); 3192 } 3193 if (bmval1 & FATTR4_WORD1_NO_TRUNC) { 3194 p = xdr_reserve_space(xdr, 4); 3195 if (!p) 3196 goto out_resource; 3197 *p++ = cpu_to_be32(1); 3198 } 3199 if (bmval1 & FATTR4_WORD1_NUMLINKS) { 3200 p = xdr_reserve_space(xdr, 4); 3201 if (!p) 3202 goto out_resource; 3203 *p++ = cpu_to_be32(stat.nlink); 3204 } 3205 if (bmval1 & FATTR4_WORD1_OWNER) { 3206 status = nfsd4_encode_user(xdr, rqstp, stat.uid); 3207 if (status) 3208 goto out; 3209 } 3210 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { 3211 status = nfsd4_encode_group(xdr, rqstp, stat.gid); 3212 if (status) 3213 goto out; 3214 } 3215 if (bmval1 & FATTR4_WORD1_RAWDEV) { 3216 p = xdr_reserve_space(xdr, 8); 3217 if (!p) 3218 goto out_resource; 3219 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev)); 3220 *p++ = cpu_to_be32((u32) MINOR(stat.rdev)); 3221 } 3222 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { 3223 p = xdr_reserve_space(xdr, 8); 3224 if (!p) 3225 goto out_resource; 3226 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; 3227 p = xdr_encode_hyper(p, dummy64); 3228 } 3229 if (bmval1 & FATTR4_WORD1_SPACE_FREE) { 3230 p = xdr_reserve_space(xdr, 8); 3231 if (!p) 3232 goto out_resource; 3233 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; 3234 p = xdr_encode_hyper(p, dummy64); 3235 } 3236 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { 3237 p = xdr_reserve_space(xdr, 8); 3238 if (!p) 3239 goto out_resource; 3240 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; 3241 p = xdr_encode_hyper(p, dummy64); 3242 } 3243 if (bmval1 & FATTR4_WORD1_SPACE_USED) { 3244 p = xdr_reserve_space(xdr, 8); 3245 if (!p) 3246 goto out_resource; 3247 dummy64 = (u64)stat.blocks << 9; 3248 p = xdr_encode_hyper(p, dummy64); 3249 } 3250 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { 3251 p = xdr_reserve_space(xdr, 12); 3252 if (!p) 3253 goto out_resource; 3254 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec); 3255 *p++ = cpu_to_be32(stat.atime.tv_nsec); 3256 } 3257 if (bmval1 & FATTR4_WORD1_TIME_DELTA) { 3258 p = xdr_reserve_space(xdr, 12); 3259 if (!p) 3260 goto out_resource; 3261 p = encode_time_delta(p, d_inode(dentry)); 3262 } 3263 if (bmval1 & FATTR4_WORD1_TIME_METADATA) { 3264 p = xdr_reserve_space(xdr, 12); 3265 if (!p) 3266 goto out_resource; 3267 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec); 3268 *p++ = cpu_to_be32(stat.ctime.tv_nsec); 3269 } 3270 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { 3271 p = xdr_reserve_space(xdr, 12); 3272 if (!p) 3273 goto out_resource; 3274 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec); 3275 *p++ = cpu_to_be32(stat.mtime.tv_nsec); 3276 } 3277 if (bmval1 & FATTR4_WORD1_TIME_CREATE) { 3278 p = xdr_reserve_space(xdr, 12); 3279 if (!p) 3280 goto out_resource; 3281 p = xdr_encode_hyper(p, (s64)stat.btime.tv_sec); 3282 *p++ = cpu_to_be32(stat.btime.tv_nsec); 3283 } 3284 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { 3285 struct kstat parent_stat; 3286 u64 ino = stat.ino; 3287 3288 p = xdr_reserve_space(xdr, 8); 3289 if (!p) 3290 goto out_resource; 3291 /* 3292 * Get parent's attributes if not ignoring crossmount 3293 * and this is the root of a cross-mounted filesystem. 3294 */ 3295 if (ignore_crossmnt == 0 && 3296 dentry == exp->ex_path.mnt->mnt_root) { 3297 err = get_parent_attributes(exp, &parent_stat); 3298 if (err) 3299 goto out_nfserr; 3300 ino = parent_stat.ino; 3301 } 3302 p = xdr_encode_hyper(p, ino); 3303 } 3304 #ifdef CONFIG_NFSD_PNFS 3305 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) { 3306 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 3307 if (status) 3308 goto out; 3309 } 3310 3311 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) { 3312 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 3313 if (status) 3314 goto out; 3315 } 3316 3317 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) { 3318 p = xdr_reserve_space(xdr, 4); 3319 if (!p) 3320 goto out_resource; 3321 *p++ = cpu_to_be32(stat.blksize); 3322 } 3323 #endif /* CONFIG_NFSD_PNFS */ 3324 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) { 3325 u32 supp[3]; 3326 3327 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 3328 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0; 3329 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1; 3330 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2; 3331 3332 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]); 3333 if (status) 3334 goto out; 3335 } 3336 3337 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3338 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 3339 status = nfsd4_encode_security_label(xdr, rqstp, context, 3340 contextlen); 3341 if (status) 3342 goto out; 3343 } 3344 #endif 3345 3346 if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) { 3347 p = xdr_reserve_space(xdr, 4); 3348 if (!p) 3349 goto out_resource; 3350 err = xattr_supported_namespace(d_inode(dentry), 3351 XATTR_USER_PREFIX); 3352 *p++ = cpu_to_be32(err == 0); 3353 } 3354 3355 *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT); 3356 status = nfs_ok; 3357 3358 out: 3359 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3360 if (context) 3361 security_release_secctx(context, contextlen); 3362 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 3363 kfree(acl); 3364 if (tempfh) { 3365 fh_put(tempfh); 3366 kfree(tempfh); 3367 } 3368 if (status) 3369 xdr_truncate_encode(xdr, starting_len); 3370 return status; 3371 out_nfserr: 3372 status = nfserrno(err); 3373 goto out; 3374 out_resource: 3375 status = nfserr_resource; 3376 goto out; 3377 } 3378 3379 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, 3380 struct xdr_buf *buf, __be32 *p, int bytes) 3381 { 3382 xdr->scratch.iov_len = 0; 3383 memset(buf, 0, sizeof(struct xdr_buf)); 3384 buf->head[0].iov_base = p; 3385 buf->head[0].iov_len = 0; 3386 buf->len = 0; 3387 xdr->buf = buf; 3388 xdr->iov = buf->head; 3389 xdr->p = p; 3390 xdr->end = (void *)p + bytes; 3391 buf->buflen = bytes; 3392 } 3393 3394 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, 3395 struct svc_fh *fhp, struct svc_export *exp, 3396 struct dentry *dentry, u32 *bmval, 3397 struct svc_rqst *rqstp, int ignore_crossmnt) 3398 { 3399 struct xdr_buf dummy; 3400 struct xdr_stream xdr; 3401 __be32 ret; 3402 3403 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); 3404 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp, 3405 ignore_crossmnt); 3406 *p = xdr.p; 3407 return ret; 3408 } 3409 3410 static inline int attributes_need_mount(u32 *bmval) 3411 { 3412 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) 3413 return 1; 3414 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) 3415 return 1; 3416 return 0; 3417 } 3418 3419 static __be32 3420 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd, 3421 const char *name, int namlen) 3422 { 3423 struct svc_export *exp = cd->rd_fhp->fh_export; 3424 struct dentry *dentry; 3425 __be32 nfserr; 3426 int ignore_crossmnt = 0; 3427 3428 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen); 3429 if (IS_ERR(dentry)) 3430 return nfserrno(PTR_ERR(dentry)); 3431 3432 exp_get(exp); 3433 /* 3434 * In the case of a mountpoint, the client may be asking for 3435 * attributes that are only properties of the underlying filesystem 3436 * as opposed to the cross-mounted file system. In such a case, 3437 * we will not follow the cross mount and will fill the attribtutes 3438 * directly from the mountpoint dentry. 3439 */ 3440 if (nfsd_mountpoint(dentry, exp)) { 3441 int err; 3442 3443 if (!(exp->ex_flags & NFSEXP_V4ROOT) 3444 && !attributes_need_mount(cd->rd_bmval)) { 3445 ignore_crossmnt = 1; 3446 goto out_encode; 3447 } 3448 /* 3449 * Why the heck aren't we just using nfsd_lookup?? 3450 * Different "."/".." handling? Something else? 3451 * At least, add a comment here to explain.... 3452 */ 3453 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); 3454 if (err) { 3455 nfserr = nfserrno(err); 3456 goto out_put; 3457 } 3458 nfserr = check_nfsd_access(exp, cd->rd_rqstp); 3459 if (nfserr) 3460 goto out_put; 3461 3462 } 3463 out_encode: 3464 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval, 3465 cd->rd_rqstp, ignore_crossmnt); 3466 out_put: 3467 dput(dentry); 3468 exp_put(exp); 3469 return nfserr; 3470 } 3471 3472 static __be32 * 3473 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr) 3474 { 3475 __be32 *p; 3476 3477 p = xdr_reserve_space(xdr, 20); 3478 if (!p) 3479 return NULL; 3480 *p++ = htonl(2); 3481 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ 3482 *p++ = htonl(0); /* bmval1 */ 3483 3484 *p++ = htonl(4); /* attribute length */ 3485 *p++ = nfserr; /* no htonl */ 3486 return p; 3487 } 3488 3489 static int 3490 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen, 3491 loff_t offset, u64 ino, unsigned int d_type) 3492 { 3493 struct readdir_cd *ccd = ccdv; 3494 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 3495 struct xdr_stream *xdr = cd->xdr; 3496 int start_offset = xdr->buf->len; 3497 int cookie_offset; 3498 u32 name_and_cookie; 3499 int entry_bytes; 3500 __be32 nfserr = nfserr_toosmall; 3501 __be64 wire_offset; 3502 __be32 *p; 3503 3504 /* In nfsv4, "." and ".." never make it onto the wire.. */ 3505 if (name && isdotent(name, namlen)) { 3506 cd->common.err = nfs_ok; 3507 return 0; 3508 } 3509 3510 if (cd->cookie_offset) { 3511 wire_offset = cpu_to_be64(offset); 3512 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset, 3513 &wire_offset, 8); 3514 } 3515 3516 p = xdr_reserve_space(xdr, 4); 3517 if (!p) 3518 goto fail; 3519 *p++ = xdr_one; /* mark entry present */ 3520 cookie_offset = xdr->buf->len; 3521 p = xdr_reserve_space(xdr, 3*4 + namlen); 3522 if (!p) 3523 goto fail; 3524 p = xdr_encode_hyper(p, OFFSET_MAX); /* offset of next entry */ 3525 p = xdr_encode_array(p, name, namlen); /* name length & name */ 3526 3527 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen); 3528 switch (nfserr) { 3529 case nfs_ok: 3530 break; 3531 case nfserr_resource: 3532 nfserr = nfserr_toosmall; 3533 goto fail; 3534 case nfserr_noent: 3535 xdr_truncate_encode(xdr, start_offset); 3536 goto skip_entry; 3537 default: 3538 /* 3539 * If the client requested the RDATTR_ERROR attribute, 3540 * we stuff the error code into this attribute 3541 * and continue. If this attribute was not requested, 3542 * then in accordance with the spec, we fail the 3543 * entire READDIR operation(!) 3544 */ 3545 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 3546 goto fail; 3547 p = nfsd4_encode_rdattr_error(xdr, nfserr); 3548 if (p == NULL) { 3549 nfserr = nfserr_toosmall; 3550 goto fail; 3551 } 3552 } 3553 nfserr = nfserr_toosmall; 3554 entry_bytes = xdr->buf->len - start_offset; 3555 if (entry_bytes > cd->rd_maxcount) 3556 goto fail; 3557 cd->rd_maxcount -= entry_bytes; 3558 /* 3559 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and 3560 * notes that it could be zero. If it is zero, then the server 3561 * should enforce only the rd_maxcount value. 3562 */ 3563 if (cd->rd_dircount) { 3564 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8; 3565 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset) 3566 goto fail; 3567 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie); 3568 if (!cd->rd_dircount) 3569 cd->rd_maxcount = 0; 3570 } 3571 3572 cd->cookie_offset = cookie_offset; 3573 skip_entry: 3574 cd->common.err = nfs_ok; 3575 return 0; 3576 fail: 3577 xdr_truncate_encode(xdr, start_offset); 3578 cd->common.err = nfserr; 3579 return -EINVAL; 3580 } 3581 3582 static __be32 3583 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid) 3584 { 3585 __be32 *p; 3586 3587 p = xdr_reserve_space(xdr, sizeof(stateid_t)); 3588 if (!p) 3589 return nfserr_resource; 3590 *p++ = cpu_to_be32(sid->si_generation); 3591 p = xdr_encode_opaque_fixed(p, &sid->si_opaque, 3592 sizeof(stateid_opaque_t)); 3593 return 0; 3594 } 3595 3596 static __be32 3597 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access) 3598 { 3599 struct xdr_stream *xdr = resp->xdr; 3600 __be32 *p; 3601 3602 p = xdr_reserve_space(xdr, 8); 3603 if (!p) 3604 return nfserr_resource; 3605 *p++ = cpu_to_be32(access->ac_supported); 3606 *p++ = cpu_to_be32(access->ac_resp_access); 3607 return 0; 3608 } 3609 3610 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts) 3611 { 3612 struct xdr_stream *xdr = resp->xdr; 3613 __be32 *p; 3614 3615 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8); 3616 if (!p) 3617 return nfserr_resource; 3618 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data, 3619 NFS4_MAX_SESSIONID_LEN); 3620 *p++ = cpu_to_be32(bcts->dir); 3621 /* Upshifting from TCP to RDMA is not supported */ 3622 *p++ = cpu_to_be32(0); 3623 return 0; 3624 } 3625 3626 static __be32 3627 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close) 3628 { 3629 struct xdr_stream *xdr = resp->xdr; 3630 3631 return nfsd4_encode_stateid(xdr, &close->cl_stateid); 3632 } 3633 3634 3635 static __be32 3636 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit) 3637 { 3638 struct xdr_stream *xdr = resp->xdr; 3639 __be32 *p; 3640 3641 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3642 if (!p) 3643 return nfserr_resource; 3644 p = xdr_encode_opaque_fixed(p, commit->co_verf.data, 3645 NFS4_VERIFIER_SIZE); 3646 return 0; 3647 } 3648 3649 static __be32 3650 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create) 3651 { 3652 struct xdr_stream *xdr = resp->xdr; 3653 __be32 *p; 3654 3655 p = xdr_reserve_space(xdr, 20); 3656 if (!p) 3657 return nfserr_resource; 3658 encode_cinfo(p, &create->cr_cinfo); 3659 return nfsd4_encode_bitmap(xdr, create->cr_bmval[0], 3660 create->cr_bmval[1], create->cr_bmval[2]); 3661 } 3662 3663 static __be32 3664 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr) 3665 { 3666 struct svc_fh *fhp = getattr->ga_fhp; 3667 struct xdr_stream *xdr = resp->xdr; 3668 3669 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry, 3670 getattr->ga_bmval, resp->rqstp, 0); 3671 } 3672 3673 static __be32 3674 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp) 3675 { 3676 struct xdr_stream *xdr = resp->xdr; 3677 struct svc_fh *fhp = *fhpp; 3678 unsigned int len; 3679 __be32 *p; 3680 3681 len = fhp->fh_handle.fh_size; 3682 p = xdr_reserve_space(xdr, len + 4); 3683 if (!p) 3684 return nfserr_resource; 3685 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len); 3686 return 0; 3687 } 3688 3689 /* 3690 * Including all fields other than the name, a LOCK4denied structure requires 3691 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. 3692 */ 3693 static __be32 3694 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld) 3695 { 3696 struct xdr_netobj *conf = &ld->ld_owner; 3697 __be32 *p; 3698 3699 again: 3700 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len)); 3701 if (!p) { 3702 /* 3703 * Don't fail to return the result just because we can't 3704 * return the conflicting open: 3705 */ 3706 if (conf->len) { 3707 kfree(conf->data); 3708 conf->len = 0; 3709 conf->data = NULL; 3710 goto again; 3711 } 3712 return nfserr_resource; 3713 } 3714 p = xdr_encode_hyper(p, ld->ld_start); 3715 p = xdr_encode_hyper(p, ld->ld_length); 3716 *p++ = cpu_to_be32(ld->ld_type); 3717 if (conf->len) { 3718 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8); 3719 p = xdr_encode_opaque(p, conf->data, conf->len); 3720 kfree(conf->data); 3721 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ 3722 p = xdr_encode_hyper(p, (u64)0); /* clientid */ 3723 *p++ = cpu_to_be32(0); /* length of owner name */ 3724 } 3725 return nfserr_denied; 3726 } 3727 3728 static __be32 3729 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock) 3730 { 3731 struct xdr_stream *xdr = resp->xdr; 3732 3733 if (!nfserr) 3734 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid); 3735 else if (nfserr == nfserr_denied) 3736 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied); 3737 3738 return nfserr; 3739 } 3740 3741 static __be32 3742 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt) 3743 { 3744 struct xdr_stream *xdr = resp->xdr; 3745 3746 if (nfserr == nfserr_denied) 3747 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied); 3748 return nfserr; 3749 } 3750 3751 static __be32 3752 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku) 3753 { 3754 struct xdr_stream *xdr = resp->xdr; 3755 3756 return nfsd4_encode_stateid(xdr, &locku->lu_stateid); 3757 } 3758 3759 3760 static __be32 3761 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link) 3762 { 3763 struct xdr_stream *xdr = resp->xdr; 3764 __be32 *p; 3765 3766 p = xdr_reserve_space(xdr, 20); 3767 if (!p) 3768 return nfserr_resource; 3769 p = encode_cinfo(p, &link->li_cinfo); 3770 return 0; 3771 } 3772 3773 3774 static __be32 3775 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open) 3776 { 3777 struct xdr_stream *xdr = resp->xdr; 3778 __be32 *p; 3779 3780 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid); 3781 if (nfserr) 3782 return nfserr; 3783 p = xdr_reserve_space(xdr, 24); 3784 if (!p) 3785 return nfserr_resource; 3786 p = encode_cinfo(p, &open->op_cinfo); 3787 *p++ = cpu_to_be32(open->op_rflags); 3788 3789 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1], 3790 open->op_bmval[2]); 3791 if (nfserr) 3792 return nfserr; 3793 3794 p = xdr_reserve_space(xdr, 4); 3795 if (!p) 3796 return nfserr_resource; 3797 3798 *p++ = cpu_to_be32(open->op_delegate_type); 3799 switch (open->op_delegate_type) { 3800 case NFS4_OPEN_DELEGATE_NONE: 3801 break; 3802 case NFS4_OPEN_DELEGATE_READ: 3803 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3804 if (nfserr) 3805 return nfserr; 3806 p = xdr_reserve_space(xdr, 20); 3807 if (!p) 3808 return nfserr_resource; 3809 *p++ = cpu_to_be32(open->op_recall); 3810 3811 /* 3812 * TODO: ACE's in delegations 3813 */ 3814 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3815 *p++ = cpu_to_be32(0); 3816 *p++ = cpu_to_be32(0); 3817 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3818 break; 3819 case NFS4_OPEN_DELEGATE_WRITE: 3820 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3821 if (nfserr) 3822 return nfserr; 3823 p = xdr_reserve_space(xdr, 32); 3824 if (!p) 3825 return nfserr_resource; 3826 *p++ = cpu_to_be32(0); 3827 3828 /* 3829 * TODO: space_limit's in delegations 3830 */ 3831 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE); 3832 *p++ = cpu_to_be32(~(u32)0); 3833 *p++ = cpu_to_be32(~(u32)0); 3834 3835 /* 3836 * TODO: ACE's in delegations 3837 */ 3838 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3839 *p++ = cpu_to_be32(0); 3840 *p++ = cpu_to_be32(0); 3841 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3842 break; 3843 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */ 3844 switch (open->op_why_no_deleg) { 3845 case WND4_CONTENTION: 3846 case WND4_RESOURCE: 3847 p = xdr_reserve_space(xdr, 8); 3848 if (!p) 3849 return nfserr_resource; 3850 *p++ = cpu_to_be32(open->op_why_no_deleg); 3851 /* deleg signaling not supported yet: */ 3852 *p++ = cpu_to_be32(0); 3853 break; 3854 default: 3855 p = xdr_reserve_space(xdr, 4); 3856 if (!p) 3857 return nfserr_resource; 3858 *p++ = cpu_to_be32(open->op_why_no_deleg); 3859 } 3860 break; 3861 default: 3862 BUG(); 3863 } 3864 /* XXX save filehandle here */ 3865 return 0; 3866 } 3867 3868 static __be32 3869 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc) 3870 { 3871 struct xdr_stream *xdr = resp->xdr; 3872 3873 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid); 3874 } 3875 3876 static __be32 3877 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od) 3878 { 3879 struct xdr_stream *xdr = resp->xdr; 3880 3881 return nfsd4_encode_stateid(xdr, &od->od_stateid); 3882 } 3883 3884 static __be32 nfsd4_encode_splice_read( 3885 struct nfsd4_compoundres *resp, 3886 struct nfsd4_read *read, 3887 struct file *file, unsigned long maxcount) 3888 { 3889 struct xdr_stream *xdr = resp->xdr; 3890 struct xdr_buf *buf = xdr->buf; 3891 int status, space_left; 3892 __be32 nfserr; 3893 3894 /* Make sure there will be room for padding if needed */ 3895 if (xdr->end - xdr->p < 1) 3896 return nfserr_resource; 3897 3898 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp, 3899 file, read->rd_offset, &maxcount, 3900 &read->rd_eof); 3901 read->rd_length = maxcount; 3902 if (nfserr) 3903 goto out_err; 3904 status = svc_encode_result_payload(read->rd_rqstp, 3905 buf->head[0].iov_len, maxcount); 3906 if (status) { 3907 nfserr = nfserrno(status); 3908 goto out_err; 3909 } 3910 3911 buf->page_len = maxcount; 3912 buf->len += maxcount; 3913 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1) 3914 / PAGE_SIZE; 3915 3916 /* Use rest of head for padding and remaining ops: */ 3917 buf->tail[0].iov_base = xdr->p; 3918 buf->tail[0].iov_len = 0; 3919 xdr->iov = buf->tail; 3920 if (maxcount&3) { 3921 int pad = 4 - (maxcount&3); 3922 3923 *(xdr->p++) = 0; 3924 3925 buf->tail[0].iov_base += maxcount&3; 3926 buf->tail[0].iov_len = pad; 3927 buf->len += pad; 3928 } 3929 3930 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p, 3931 buf->buflen - buf->len); 3932 buf->buflen = buf->len + space_left; 3933 xdr->end = (__be32 *)((void *)xdr->end + space_left); 3934 3935 return 0; 3936 3937 out_err: 3938 /* 3939 * nfsd_splice_actor may have already messed with the 3940 * page length; reset it so as not to confuse 3941 * xdr_truncate_encode in our caller. 3942 */ 3943 buf->page_len = 0; 3944 return nfserr; 3945 } 3946 3947 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, 3948 struct nfsd4_read *read, 3949 struct file *file, unsigned long maxcount) 3950 { 3951 struct xdr_stream *xdr = resp->xdr; 3952 unsigned int starting_len = xdr->buf->len; 3953 __be32 zero = xdr_zero; 3954 __be32 nfserr; 3955 3956 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount); 3957 if (read->rd_vlen < 0) 3958 return nfserr_resource; 3959 3960 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset, 3961 resp->rqstp->rq_vec, read->rd_vlen, &maxcount, 3962 &read->rd_eof); 3963 read->rd_length = maxcount; 3964 if (nfserr) 3965 return nfserr; 3966 if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount)) 3967 return nfserr_io; 3968 xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount)); 3969 3970 write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero, 3971 xdr_pad_size(maxcount)); 3972 return nfs_ok; 3973 } 3974 3975 static __be32 3976 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 3977 struct nfsd4_read *read) 3978 { 3979 bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags); 3980 unsigned long maxcount; 3981 struct xdr_stream *xdr = resp->xdr; 3982 struct file *file; 3983 int starting_len = xdr->buf->len; 3984 __be32 *p; 3985 3986 if (nfserr) 3987 return nfserr; 3988 file = read->rd_nf->nf_file; 3989 3990 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ 3991 if (!p) { 3992 WARN_ON_ONCE(splice_ok); 3993 return nfserr_resource; 3994 } 3995 if (resp->xdr->buf->page_len && splice_ok) { 3996 WARN_ON_ONCE(1); 3997 return nfserr_resource; 3998 } 3999 xdr_commit_encode(xdr); 4000 4001 maxcount = min_t(unsigned long, read->rd_length, 4002 (xdr->buf->buflen - xdr->buf->len)); 4003 4004 if (file->f_op->splice_read && splice_ok) 4005 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 4006 else 4007 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 4008 if (nfserr) { 4009 xdr_truncate_encode(xdr, starting_len); 4010 return nfserr; 4011 } 4012 4013 p = xdr_encode_bool(p, read->rd_eof); 4014 *p = cpu_to_be32(read->rd_length); 4015 return nfs_ok; 4016 } 4017 4018 static __be32 4019 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink) 4020 { 4021 __be32 *p, *maxcount_p, zero = xdr_zero; 4022 struct xdr_stream *xdr = resp->xdr; 4023 int length_offset = xdr->buf->len; 4024 int maxcount, status; 4025 4026 maxcount_p = xdr_reserve_space(xdr, XDR_UNIT); 4027 if (!maxcount_p) 4028 return nfserr_resource; 4029 maxcount = PAGE_SIZE; 4030 4031 p = xdr_reserve_space(xdr, maxcount); 4032 if (!p) 4033 return nfserr_resource; 4034 /* 4035 * XXX: By default, vfs_readlink() will truncate symlinks if they 4036 * would overflow the buffer. Is this kosher in NFSv4? If not, one 4037 * easy fix is: if vfs_readlink() precisely fills the buffer, assume 4038 * that truncation occurred, and return NFS4ERR_RESOURCE. 4039 */ 4040 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, 4041 (char *)p, &maxcount); 4042 if (nfserr == nfserr_isdir) 4043 nfserr = nfserr_inval; 4044 if (nfserr) 4045 goto out_err; 4046 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset, 4047 maxcount); 4048 if (status) { 4049 nfserr = nfserrno(status); 4050 goto out_err; 4051 } 4052 *maxcount_p = cpu_to_be32(maxcount); 4053 xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount)); 4054 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero, 4055 xdr_pad_size(maxcount)); 4056 return nfs_ok; 4057 4058 out_err: 4059 xdr_truncate_encode(xdr, length_offset); 4060 return nfserr; 4061 } 4062 4063 static __be32 4064 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir) 4065 { 4066 int maxcount; 4067 int bytes_left; 4068 loff_t offset; 4069 __be64 wire_offset; 4070 struct xdr_stream *xdr = resp->xdr; 4071 int starting_len = xdr->buf->len; 4072 __be32 *p; 4073 4074 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 4075 if (!p) 4076 return nfserr_resource; 4077 4078 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ 4079 *p++ = cpu_to_be32(0); 4080 *p++ = cpu_to_be32(0); 4081 xdr->buf->head[0].iov_len = (char *)xdr->p - 4082 (char *)xdr->buf->head[0].iov_base; 4083 4084 /* 4085 * Number of bytes left for directory entries allowing for the 4086 * final 8 bytes of the readdir and a following failed op: 4087 */ 4088 bytes_left = xdr->buf->buflen - xdr->buf->len 4089 - COMPOUND_ERR_SLACK_SPACE - 8; 4090 if (bytes_left < 0) { 4091 nfserr = nfserr_resource; 4092 goto err_no_verf; 4093 } 4094 maxcount = svc_max_payload(resp->rqstp); 4095 maxcount = min_t(u32, readdir->rd_maxcount, maxcount); 4096 /* 4097 * Note the rfc defines rd_maxcount as the size of the 4098 * READDIR4resok structure, which includes the verifier above 4099 * and the 8 bytes encoded at the end of this function: 4100 */ 4101 if (maxcount < 16) { 4102 nfserr = nfserr_toosmall; 4103 goto err_no_verf; 4104 } 4105 maxcount = min_t(int, maxcount-16, bytes_left); 4106 4107 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */ 4108 if (!readdir->rd_dircount) 4109 readdir->rd_dircount = svc_max_payload(resp->rqstp); 4110 4111 readdir->xdr = xdr; 4112 readdir->rd_maxcount = maxcount; 4113 readdir->common.err = 0; 4114 readdir->cookie_offset = 0; 4115 4116 offset = readdir->rd_cookie; 4117 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, 4118 &offset, 4119 &readdir->common, nfsd4_encode_dirent); 4120 if (nfserr == nfs_ok && 4121 readdir->common.err == nfserr_toosmall && 4122 xdr->buf->len == starting_len + 8) { 4123 /* nothing encoded; which limit did we hit?: */ 4124 if (maxcount - 16 < bytes_left) 4125 /* It was the fault of rd_maxcount: */ 4126 nfserr = nfserr_toosmall; 4127 else 4128 /* We ran out of buffer space: */ 4129 nfserr = nfserr_resource; 4130 } 4131 if (nfserr) 4132 goto err_no_verf; 4133 4134 if (readdir->cookie_offset) { 4135 wire_offset = cpu_to_be64(offset); 4136 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, 4137 &wire_offset, 8); 4138 } 4139 4140 p = xdr_reserve_space(xdr, 8); 4141 if (!p) { 4142 WARN_ON_ONCE(1); 4143 goto err_no_verf; 4144 } 4145 *p++ = 0; /* no more entries */ 4146 *p++ = htonl(readdir->common.err == nfserr_eof); 4147 4148 return 0; 4149 err_no_verf: 4150 xdr_truncate_encode(xdr, starting_len); 4151 return nfserr; 4152 } 4153 4154 static __be32 4155 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove) 4156 { 4157 struct xdr_stream *xdr = resp->xdr; 4158 __be32 *p; 4159 4160 p = xdr_reserve_space(xdr, 20); 4161 if (!p) 4162 return nfserr_resource; 4163 p = encode_cinfo(p, &remove->rm_cinfo); 4164 return 0; 4165 } 4166 4167 static __be32 4168 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename) 4169 { 4170 struct xdr_stream *xdr = resp->xdr; 4171 __be32 *p; 4172 4173 p = xdr_reserve_space(xdr, 40); 4174 if (!p) 4175 return nfserr_resource; 4176 p = encode_cinfo(p, &rename->rn_sinfo); 4177 p = encode_cinfo(p, &rename->rn_tinfo); 4178 return 0; 4179 } 4180 4181 static __be32 4182 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp) 4183 { 4184 u32 i, nflavs, supported; 4185 struct exp_flavor_info *flavs; 4186 struct exp_flavor_info def_flavs[2]; 4187 __be32 *p, *flavorsp; 4188 static bool report = true; 4189 4190 if (exp->ex_nflavors) { 4191 flavs = exp->ex_flavors; 4192 nflavs = exp->ex_nflavors; 4193 } else { /* Handling of some defaults in absence of real secinfo: */ 4194 flavs = def_flavs; 4195 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { 4196 nflavs = 2; 4197 flavs[0].pseudoflavor = RPC_AUTH_UNIX; 4198 flavs[1].pseudoflavor = RPC_AUTH_NULL; 4199 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { 4200 nflavs = 1; 4201 flavs[0].pseudoflavor 4202 = svcauth_gss_flavor(exp->ex_client); 4203 } else { 4204 nflavs = 1; 4205 flavs[0].pseudoflavor 4206 = exp->ex_client->flavour->flavour; 4207 } 4208 } 4209 4210 supported = 0; 4211 p = xdr_reserve_space(xdr, 4); 4212 if (!p) 4213 return nfserr_resource; 4214 flavorsp = p++; /* to be backfilled later */ 4215 4216 for (i = 0; i < nflavs; i++) { 4217 rpc_authflavor_t pf = flavs[i].pseudoflavor; 4218 struct rpcsec_gss_info info; 4219 4220 if (rpcauth_get_gssinfo(pf, &info) == 0) { 4221 supported++; 4222 p = xdr_reserve_space(xdr, 4 + 4 + 4223 XDR_LEN(info.oid.len) + 4 + 4); 4224 if (!p) 4225 return nfserr_resource; 4226 *p++ = cpu_to_be32(RPC_AUTH_GSS); 4227 p = xdr_encode_opaque(p, info.oid.data, info.oid.len); 4228 *p++ = cpu_to_be32(info.qop); 4229 *p++ = cpu_to_be32(info.service); 4230 } else if (pf < RPC_AUTH_MAXFLAVOR) { 4231 supported++; 4232 p = xdr_reserve_space(xdr, 4); 4233 if (!p) 4234 return nfserr_resource; 4235 *p++ = cpu_to_be32(pf); 4236 } else { 4237 if (report) 4238 pr_warn("NFS: SECINFO: security flavor %u " 4239 "is not supported\n", pf); 4240 } 4241 } 4242 4243 if (nflavs != supported) 4244 report = false; 4245 *flavorsp = htonl(supported); 4246 return 0; 4247 } 4248 4249 static __be32 4250 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4251 struct nfsd4_secinfo *secinfo) 4252 { 4253 struct xdr_stream *xdr = resp->xdr; 4254 4255 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp); 4256 } 4257 4258 static __be32 4259 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, 4260 struct nfsd4_secinfo_no_name *secinfo) 4261 { 4262 struct xdr_stream *xdr = resp->xdr; 4263 4264 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp); 4265 } 4266 4267 /* 4268 * The SETATTR encode routine is special -- it always encodes a bitmap, 4269 * regardless of the error status. 4270 */ 4271 static __be32 4272 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr) 4273 { 4274 struct xdr_stream *xdr = resp->xdr; 4275 __be32 *p; 4276 4277 p = xdr_reserve_space(xdr, 16); 4278 if (!p) 4279 return nfserr_resource; 4280 if (nfserr) { 4281 *p++ = cpu_to_be32(3); 4282 *p++ = cpu_to_be32(0); 4283 *p++ = cpu_to_be32(0); 4284 *p++ = cpu_to_be32(0); 4285 } 4286 else { 4287 *p++ = cpu_to_be32(3); 4288 *p++ = cpu_to_be32(setattr->sa_bmval[0]); 4289 *p++ = cpu_to_be32(setattr->sa_bmval[1]); 4290 *p++ = cpu_to_be32(setattr->sa_bmval[2]); 4291 } 4292 return nfserr; 4293 } 4294 4295 static __be32 4296 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd) 4297 { 4298 struct xdr_stream *xdr = resp->xdr; 4299 __be32 *p; 4300 4301 if (!nfserr) { 4302 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE); 4303 if (!p) 4304 return nfserr_resource; 4305 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8); 4306 p = xdr_encode_opaque_fixed(p, &scd->se_confirm, 4307 NFS4_VERIFIER_SIZE); 4308 } 4309 else if (nfserr == nfserr_clid_inuse) { 4310 p = xdr_reserve_space(xdr, 8); 4311 if (!p) 4312 return nfserr_resource; 4313 *p++ = cpu_to_be32(0); 4314 *p++ = cpu_to_be32(0); 4315 } 4316 return nfserr; 4317 } 4318 4319 static __be32 4320 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write) 4321 { 4322 struct xdr_stream *xdr = resp->xdr; 4323 __be32 *p; 4324 4325 p = xdr_reserve_space(xdr, 16); 4326 if (!p) 4327 return nfserr_resource; 4328 *p++ = cpu_to_be32(write->wr_bytes_written); 4329 *p++ = cpu_to_be32(write->wr_how_written); 4330 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4331 NFS4_VERIFIER_SIZE); 4332 return 0; 4333 } 4334 4335 static __be32 4336 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, 4337 struct nfsd4_exchange_id *exid) 4338 { 4339 struct xdr_stream *xdr = resp->xdr; 4340 __be32 *p; 4341 char *major_id; 4342 char *server_scope; 4343 int major_id_sz; 4344 int server_scope_sz; 4345 uint64_t minor_id = 0; 4346 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id); 4347 4348 major_id = nn->nfsd_name; 4349 major_id_sz = strlen(nn->nfsd_name); 4350 server_scope = nn->nfsd_name; 4351 server_scope_sz = strlen(nn->nfsd_name); 4352 4353 p = xdr_reserve_space(xdr, 4354 8 /* eir_clientid */ + 4355 4 /* eir_sequenceid */ + 4356 4 /* eir_flags */ + 4357 4 /* spr_how */); 4358 if (!p) 4359 return nfserr_resource; 4360 4361 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8); 4362 *p++ = cpu_to_be32(exid->seqid); 4363 *p++ = cpu_to_be32(exid->flags); 4364 4365 *p++ = cpu_to_be32(exid->spa_how); 4366 4367 switch (exid->spa_how) { 4368 case SP4_NONE: 4369 break; 4370 case SP4_MACH_CRED: 4371 /* spo_must_enforce bitmap: */ 4372 nfserr = nfsd4_encode_bitmap(xdr, 4373 exid->spo_must_enforce[0], 4374 exid->spo_must_enforce[1], 4375 exid->spo_must_enforce[2]); 4376 if (nfserr) 4377 return nfserr; 4378 /* spo_must_allow bitmap: */ 4379 nfserr = nfsd4_encode_bitmap(xdr, 4380 exid->spo_must_allow[0], 4381 exid->spo_must_allow[1], 4382 exid->spo_must_allow[2]); 4383 if (nfserr) 4384 return nfserr; 4385 break; 4386 default: 4387 WARN_ON_ONCE(1); 4388 } 4389 4390 p = xdr_reserve_space(xdr, 4391 8 /* so_minor_id */ + 4392 4 /* so_major_id.len */ + 4393 (XDR_QUADLEN(major_id_sz) * 4) + 4394 4 /* eir_server_scope.len */ + 4395 (XDR_QUADLEN(server_scope_sz) * 4) + 4396 4 /* eir_server_impl_id.count (0) */); 4397 if (!p) 4398 return nfserr_resource; 4399 4400 /* The server_owner struct */ 4401 p = xdr_encode_hyper(p, minor_id); /* Minor id */ 4402 /* major id */ 4403 p = xdr_encode_opaque(p, major_id, major_id_sz); 4404 4405 /* Server scope */ 4406 p = xdr_encode_opaque(p, server_scope, server_scope_sz); 4407 4408 /* Implementation id */ 4409 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */ 4410 return 0; 4411 } 4412 4413 static __be32 4414 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, 4415 struct nfsd4_create_session *sess) 4416 { 4417 struct xdr_stream *xdr = resp->xdr; 4418 __be32 *p; 4419 4420 p = xdr_reserve_space(xdr, 24); 4421 if (!p) 4422 return nfserr_resource; 4423 p = xdr_encode_opaque_fixed(p, sess->sessionid.data, 4424 NFS4_MAX_SESSIONID_LEN); 4425 *p++ = cpu_to_be32(sess->seqid); 4426 *p++ = cpu_to_be32(sess->flags); 4427 4428 p = xdr_reserve_space(xdr, 28); 4429 if (!p) 4430 return nfserr_resource; 4431 *p++ = cpu_to_be32(0); /* headerpadsz */ 4432 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz); 4433 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz); 4434 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached); 4435 *p++ = cpu_to_be32(sess->fore_channel.maxops); 4436 *p++ = cpu_to_be32(sess->fore_channel.maxreqs); 4437 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs); 4438 4439 if (sess->fore_channel.nr_rdma_attrs) { 4440 p = xdr_reserve_space(xdr, 4); 4441 if (!p) 4442 return nfserr_resource; 4443 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs); 4444 } 4445 4446 p = xdr_reserve_space(xdr, 28); 4447 if (!p) 4448 return nfserr_resource; 4449 *p++ = cpu_to_be32(0); /* headerpadsz */ 4450 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz); 4451 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz); 4452 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached); 4453 *p++ = cpu_to_be32(sess->back_channel.maxops); 4454 *p++ = cpu_to_be32(sess->back_channel.maxreqs); 4455 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs); 4456 4457 if (sess->back_channel.nr_rdma_attrs) { 4458 p = xdr_reserve_space(xdr, 4); 4459 if (!p) 4460 return nfserr_resource; 4461 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs); 4462 } 4463 return 0; 4464 } 4465 4466 static __be32 4467 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, 4468 struct nfsd4_sequence *seq) 4469 { 4470 struct xdr_stream *xdr = resp->xdr; 4471 __be32 *p; 4472 4473 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20); 4474 if (!p) 4475 return nfserr_resource; 4476 p = xdr_encode_opaque_fixed(p, seq->sessionid.data, 4477 NFS4_MAX_SESSIONID_LEN); 4478 *p++ = cpu_to_be32(seq->seqid); 4479 *p++ = cpu_to_be32(seq->slotid); 4480 /* Note slotid's are numbered from zero: */ 4481 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */ 4482 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */ 4483 *p++ = cpu_to_be32(seq->status_flags); 4484 4485 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */ 4486 return 0; 4487 } 4488 4489 static __be32 4490 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, 4491 struct nfsd4_test_stateid *test_stateid) 4492 { 4493 struct xdr_stream *xdr = resp->xdr; 4494 struct nfsd4_test_stateid_id *stateid, *next; 4495 __be32 *p; 4496 4497 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids)); 4498 if (!p) 4499 return nfserr_resource; 4500 *p++ = htonl(test_stateid->ts_num_ids); 4501 4502 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) { 4503 *p++ = stateid->ts_id_status; 4504 } 4505 4506 return 0; 4507 } 4508 4509 #ifdef CONFIG_NFSD_PNFS 4510 static __be32 4511 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4512 struct nfsd4_getdeviceinfo *gdev) 4513 { 4514 struct xdr_stream *xdr = resp->xdr; 4515 const struct nfsd4_layout_ops *ops; 4516 u32 starting_len = xdr->buf->len, needed_len; 4517 __be32 *p; 4518 4519 p = xdr_reserve_space(xdr, 4); 4520 if (!p) 4521 return nfserr_resource; 4522 4523 *p++ = cpu_to_be32(gdev->gd_layout_type); 4524 4525 /* If maxcount is 0 then just update notifications */ 4526 if (gdev->gd_maxcount != 0) { 4527 ops = nfsd4_layout_ops[gdev->gd_layout_type]; 4528 nfserr = ops->encode_getdeviceinfo(xdr, gdev); 4529 if (nfserr) { 4530 /* 4531 * We don't bother to burden the layout drivers with 4532 * enforcing gd_maxcount, just tell the client to 4533 * come back with a bigger buffer if it's not enough. 4534 */ 4535 if (xdr->buf->len + 4 > gdev->gd_maxcount) 4536 goto toosmall; 4537 return nfserr; 4538 } 4539 } 4540 4541 if (gdev->gd_notify_types) { 4542 p = xdr_reserve_space(xdr, 4 + 4); 4543 if (!p) 4544 return nfserr_resource; 4545 *p++ = cpu_to_be32(1); /* bitmap length */ 4546 *p++ = cpu_to_be32(gdev->gd_notify_types); 4547 } else { 4548 p = xdr_reserve_space(xdr, 4); 4549 if (!p) 4550 return nfserr_resource; 4551 *p++ = 0; 4552 } 4553 4554 return 0; 4555 toosmall: 4556 dprintk("%s: maxcount too small\n", __func__); 4557 needed_len = xdr->buf->len + 4 /* notifications */; 4558 xdr_truncate_encode(xdr, starting_len); 4559 p = xdr_reserve_space(xdr, 4); 4560 if (!p) 4561 return nfserr_resource; 4562 *p++ = cpu_to_be32(needed_len); 4563 return nfserr_toosmall; 4564 } 4565 4566 static __be32 4567 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, 4568 struct nfsd4_layoutget *lgp) 4569 { 4570 struct xdr_stream *xdr = resp->xdr; 4571 const struct nfsd4_layout_ops *ops; 4572 __be32 *p; 4573 4574 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t)); 4575 if (!p) 4576 return nfserr_resource; 4577 4578 *p++ = cpu_to_be32(1); /* we always set return-on-close */ 4579 *p++ = cpu_to_be32(lgp->lg_sid.si_generation); 4580 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque, 4581 sizeof(stateid_opaque_t)); 4582 4583 *p++ = cpu_to_be32(1); /* we always return a single layout */ 4584 p = xdr_encode_hyper(p, lgp->lg_seg.offset); 4585 p = xdr_encode_hyper(p, lgp->lg_seg.length); 4586 *p++ = cpu_to_be32(lgp->lg_seg.iomode); 4587 *p++ = cpu_to_be32(lgp->lg_layout_type); 4588 4589 ops = nfsd4_layout_ops[lgp->lg_layout_type]; 4590 return ops->encode_layoutget(xdr, lgp); 4591 } 4592 4593 static __be32 4594 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, 4595 struct nfsd4_layoutcommit *lcp) 4596 { 4597 struct xdr_stream *xdr = resp->xdr; 4598 __be32 *p; 4599 4600 p = xdr_reserve_space(xdr, 4); 4601 if (!p) 4602 return nfserr_resource; 4603 *p++ = cpu_to_be32(lcp->lc_size_chg); 4604 if (lcp->lc_size_chg) { 4605 p = xdr_reserve_space(xdr, 8); 4606 if (!p) 4607 return nfserr_resource; 4608 p = xdr_encode_hyper(p, lcp->lc_newsize); 4609 } 4610 4611 return 0; 4612 } 4613 4614 static __be32 4615 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr, 4616 struct nfsd4_layoutreturn *lrp) 4617 { 4618 struct xdr_stream *xdr = resp->xdr; 4619 __be32 *p; 4620 4621 p = xdr_reserve_space(xdr, 4); 4622 if (!p) 4623 return nfserr_resource; 4624 *p++ = cpu_to_be32(lrp->lrs_present); 4625 if (lrp->lrs_present) 4626 return nfsd4_encode_stateid(xdr, &lrp->lr_sid); 4627 return 0; 4628 } 4629 #endif /* CONFIG_NFSD_PNFS */ 4630 4631 static __be32 4632 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, 4633 struct nfsd42_write_res *write, bool sync) 4634 { 4635 __be32 *p; 4636 p = xdr_reserve_space(resp->xdr, 4); 4637 if (!p) 4638 return nfserr_resource; 4639 4640 if (sync) 4641 *p++ = cpu_to_be32(0); 4642 else { 4643 __be32 nfserr; 4644 *p++ = cpu_to_be32(1); 4645 nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid); 4646 if (nfserr) 4647 return nfserr; 4648 } 4649 p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE); 4650 if (!p) 4651 return nfserr_resource; 4652 4653 p = xdr_encode_hyper(p, write->wr_bytes_written); 4654 *p++ = cpu_to_be32(write->wr_stable_how); 4655 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4656 NFS4_VERIFIER_SIZE); 4657 return nfs_ok; 4658 } 4659 4660 static __be32 4661 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns) 4662 { 4663 struct xdr_stream *xdr = resp->xdr; 4664 struct nfs42_netaddr *addr; 4665 __be32 *p; 4666 4667 p = xdr_reserve_space(xdr, 4); 4668 *p++ = cpu_to_be32(ns->nl4_type); 4669 4670 switch (ns->nl4_type) { 4671 case NL4_NETADDR: 4672 addr = &ns->u.nl4_addr; 4673 4674 /* netid_len, netid, uaddr_len, uaddr (port included 4675 * in RPCBIND_MAXUADDRLEN) 4676 */ 4677 p = xdr_reserve_space(xdr, 4678 4 /* netid len */ + 4679 (XDR_QUADLEN(addr->netid_len) * 4) + 4680 4 /* uaddr len */ + 4681 (XDR_QUADLEN(addr->addr_len) * 4)); 4682 if (!p) 4683 return nfserr_resource; 4684 4685 *p++ = cpu_to_be32(addr->netid_len); 4686 p = xdr_encode_opaque_fixed(p, addr->netid, 4687 addr->netid_len); 4688 *p++ = cpu_to_be32(addr->addr_len); 4689 p = xdr_encode_opaque_fixed(p, addr->addr, 4690 addr->addr_len); 4691 break; 4692 default: 4693 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR); 4694 return nfserr_inval; 4695 } 4696 4697 return 0; 4698 } 4699 4700 static __be32 4701 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr, 4702 struct nfsd4_copy *copy) 4703 { 4704 __be32 *p; 4705 4706 nfserr = nfsd42_encode_write_res(resp, ©->cp_res, 4707 nfsd4_copy_is_sync(copy)); 4708 if (nfserr) 4709 return nfserr; 4710 4711 p = xdr_reserve_space(resp->xdr, 4 + 4); 4712 *p++ = xdr_one; /* cr_consecutive */ 4713 *p = nfsd4_copy_is_sync(copy) ? xdr_one : xdr_zero; 4714 return 0; 4715 } 4716 4717 static __be32 4718 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr, 4719 struct nfsd4_offload_status *os) 4720 { 4721 struct xdr_stream *xdr = resp->xdr; 4722 __be32 *p; 4723 4724 p = xdr_reserve_space(xdr, 8 + 4); 4725 if (!p) 4726 return nfserr_resource; 4727 p = xdr_encode_hyper(p, os->count); 4728 *p++ = cpu_to_be32(0); 4729 return nfserr; 4730 } 4731 4732 static __be32 4733 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp, 4734 struct nfsd4_read *read, 4735 unsigned long *maxcount, u32 *eof, 4736 loff_t *pos) 4737 { 4738 struct xdr_stream *xdr = resp->xdr; 4739 struct file *file = read->rd_nf->nf_file; 4740 int starting_len = xdr->buf->len; 4741 loff_t hole_pos; 4742 __be32 nfserr; 4743 __be32 *p, tmp; 4744 __be64 tmp64; 4745 4746 hole_pos = pos ? *pos : vfs_llseek(file, read->rd_offset, SEEK_HOLE); 4747 if (hole_pos > read->rd_offset) 4748 *maxcount = min_t(unsigned long, *maxcount, hole_pos - read->rd_offset); 4749 *maxcount = min_t(unsigned long, *maxcount, (xdr->buf->buflen - xdr->buf->len)); 4750 4751 /* Content type, offset, byte count */ 4752 p = xdr_reserve_space(xdr, 4 + 8 + 4); 4753 if (!p) 4754 return nfserr_resource; 4755 4756 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, *maxcount); 4757 if (read->rd_vlen < 0) 4758 return nfserr_resource; 4759 4760 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset, 4761 resp->rqstp->rq_vec, read->rd_vlen, maxcount, eof); 4762 if (nfserr) 4763 return nfserr; 4764 xdr_truncate_encode(xdr, starting_len + 16 + xdr_align_size(*maxcount)); 4765 4766 tmp = htonl(NFS4_CONTENT_DATA); 4767 write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4); 4768 tmp64 = cpu_to_be64(read->rd_offset); 4769 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp64, 8); 4770 tmp = htonl(*maxcount); 4771 write_bytes_to_xdr_buf(xdr->buf, starting_len + 12, &tmp, 4); 4772 4773 tmp = xdr_zero; 4774 write_bytes_to_xdr_buf(xdr->buf, starting_len + 16 + *maxcount, &tmp, 4775 xdr_pad_size(*maxcount)); 4776 return nfs_ok; 4777 } 4778 4779 static __be32 4780 nfsd4_encode_read_plus_hole(struct nfsd4_compoundres *resp, 4781 struct nfsd4_read *read, 4782 unsigned long *maxcount, u32 *eof) 4783 { 4784 struct file *file = read->rd_nf->nf_file; 4785 loff_t data_pos = vfs_llseek(file, read->rd_offset, SEEK_DATA); 4786 loff_t f_size = i_size_read(file_inode(file)); 4787 unsigned long count; 4788 __be32 *p; 4789 4790 if (data_pos == -ENXIO) 4791 data_pos = f_size; 4792 else if (data_pos <= read->rd_offset || (data_pos < f_size && data_pos % PAGE_SIZE)) 4793 return nfsd4_encode_read_plus_data(resp, read, maxcount, eof, &f_size); 4794 count = data_pos - read->rd_offset; 4795 4796 /* Content type, offset, byte count */ 4797 p = xdr_reserve_space(resp->xdr, 4 + 8 + 8); 4798 if (!p) 4799 return nfserr_resource; 4800 4801 *p++ = htonl(NFS4_CONTENT_HOLE); 4802 p = xdr_encode_hyper(p, read->rd_offset); 4803 p = xdr_encode_hyper(p, count); 4804 4805 *eof = (read->rd_offset + count) >= f_size; 4806 *maxcount = min_t(unsigned long, count, *maxcount); 4807 return nfs_ok; 4808 } 4809 4810 static __be32 4811 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr, 4812 struct nfsd4_read *read) 4813 { 4814 unsigned long maxcount, count; 4815 struct xdr_stream *xdr = resp->xdr; 4816 struct file *file; 4817 int starting_len = xdr->buf->len; 4818 int last_segment = xdr->buf->len; 4819 int segments = 0; 4820 __be32 *p, tmp; 4821 bool is_data; 4822 loff_t pos; 4823 u32 eof; 4824 4825 if (nfserr) 4826 return nfserr; 4827 file = read->rd_nf->nf_file; 4828 4829 /* eof flag, segment count */ 4830 p = xdr_reserve_space(xdr, 4 + 4); 4831 if (!p) 4832 return nfserr_resource; 4833 xdr_commit_encode(xdr); 4834 4835 maxcount = min_t(unsigned long, read->rd_length, 4836 (xdr->buf->buflen - xdr->buf->len)); 4837 count = maxcount; 4838 4839 eof = read->rd_offset >= i_size_read(file_inode(file)); 4840 if (eof) 4841 goto out; 4842 4843 pos = vfs_llseek(file, read->rd_offset, SEEK_HOLE); 4844 is_data = pos > read->rd_offset; 4845 4846 while (count > 0 && !eof) { 4847 maxcount = count; 4848 if (is_data) 4849 nfserr = nfsd4_encode_read_plus_data(resp, read, &maxcount, &eof, 4850 segments == 0 ? &pos : NULL); 4851 else 4852 nfserr = nfsd4_encode_read_plus_hole(resp, read, &maxcount, &eof); 4853 if (nfserr) 4854 goto out; 4855 count -= maxcount; 4856 read->rd_offset += maxcount; 4857 is_data = !is_data; 4858 last_segment = xdr->buf->len; 4859 segments++; 4860 } 4861 4862 out: 4863 if (nfserr && segments == 0) 4864 xdr_truncate_encode(xdr, starting_len); 4865 else { 4866 if (nfserr) { 4867 xdr_truncate_encode(xdr, last_segment); 4868 nfserr = nfs_ok; 4869 eof = 0; 4870 } 4871 tmp = htonl(eof); 4872 write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4); 4873 tmp = htonl(segments); 4874 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4); 4875 } 4876 4877 return nfserr; 4878 } 4879 4880 static __be32 4881 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr, 4882 struct nfsd4_copy_notify *cn) 4883 { 4884 struct xdr_stream *xdr = resp->xdr; 4885 __be32 *p; 4886 4887 if (nfserr) 4888 return nfserr; 4889 4890 /* 8 sec, 4 nsec */ 4891 p = xdr_reserve_space(xdr, 12); 4892 if (!p) 4893 return nfserr_resource; 4894 4895 /* cnr_lease_time */ 4896 p = xdr_encode_hyper(p, cn->cpn_sec); 4897 *p++ = cpu_to_be32(cn->cpn_nsec); 4898 4899 /* cnr_stateid */ 4900 nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid); 4901 if (nfserr) 4902 return nfserr; 4903 4904 /* cnr_src.nl_nsvr */ 4905 p = xdr_reserve_space(xdr, 4); 4906 if (!p) 4907 return nfserr_resource; 4908 4909 *p++ = cpu_to_be32(1); 4910 4911 nfserr = nfsd42_encode_nl4_server(resp, cn->cpn_src); 4912 return nfserr; 4913 } 4914 4915 static __be32 4916 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, 4917 struct nfsd4_seek *seek) 4918 { 4919 __be32 *p; 4920 4921 p = xdr_reserve_space(resp->xdr, 4 + 8); 4922 *p++ = cpu_to_be32(seek->seek_eof); 4923 p = xdr_encode_hyper(p, seek->seek_pos); 4924 4925 return 0; 4926 } 4927 4928 static __be32 4929 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p) 4930 { 4931 return nfserr; 4932 } 4933 4934 /* 4935 * Encode kmalloc-ed buffer in to XDR stream. 4936 */ 4937 static __be32 4938 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen) 4939 { 4940 u32 cplen; 4941 __be32 *p; 4942 4943 cplen = min_t(unsigned long, buflen, 4944 ((void *)xdr->end - (void *)xdr->p)); 4945 p = xdr_reserve_space(xdr, cplen); 4946 if (!p) 4947 return nfserr_resource; 4948 4949 memcpy(p, buf, cplen); 4950 buf += cplen; 4951 buflen -= cplen; 4952 4953 while (buflen) { 4954 cplen = min_t(u32, buflen, PAGE_SIZE); 4955 p = xdr_reserve_space(xdr, cplen); 4956 if (!p) 4957 return nfserr_resource; 4958 4959 memcpy(p, buf, cplen); 4960 4961 if (cplen < PAGE_SIZE) { 4962 /* 4963 * We're done, with a length that wasn't page 4964 * aligned, so possibly not word aligned. Pad 4965 * any trailing bytes with 0. 4966 */ 4967 xdr_encode_opaque_fixed(p, NULL, cplen); 4968 break; 4969 } 4970 4971 buflen -= PAGE_SIZE; 4972 buf += PAGE_SIZE; 4973 } 4974 4975 return 0; 4976 } 4977 4978 static __be32 4979 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 4980 struct nfsd4_getxattr *getxattr) 4981 { 4982 struct xdr_stream *xdr = resp->xdr; 4983 __be32 *p, err; 4984 4985 p = xdr_reserve_space(xdr, 4); 4986 if (!p) 4987 return nfserr_resource; 4988 4989 *p = cpu_to_be32(getxattr->getxa_len); 4990 4991 if (getxattr->getxa_len == 0) 4992 return 0; 4993 4994 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf, 4995 getxattr->getxa_len); 4996 4997 kvfree(getxattr->getxa_buf); 4998 4999 return err; 5000 } 5001 5002 static __be32 5003 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5004 struct nfsd4_setxattr *setxattr) 5005 { 5006 struct xdr_stream *xdr = resp->xdr; 5007 __be32 *p; 5008 5009 p = xdr_reserve_space(xdr, 20); 5010 if (!p) 5011 return nfserr_resource; 5012 5013 encode_cinfo(p, &setxattr->setxa_cinfo); 5014 5015 return 0; 5016 } 5017 5018 /* 5019 * See if there are cookie values that can be rejected outright. 5020 */ 5021 static __be32 5022 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs, 5023 u32 *offsetp) 5024 { 5025 u64 cookie = listxattrs->lsxa_cookie; 5026 5027 /* 5028 * If the cookie is larger than the maximum number we can fit 5029 * in either the buffer we just got back from vfs_listxattr, or, 5030 * XDR-encoded, in the return buffer, it's invalid. 5031 */ 5032 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2)) 5033 return nfserr_badcookie; 5034 5035 if (cookie > (listxattrs->lsxa_maxcount / 5036 (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4))) 5037 return nfserr_badcookie; 5038 5039 *offsetp = (u32)cookie; 5040 return 0; 5041 } 5042 5043 static __be32 5044 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr, 5045 struct nfsd4_listxattrs *listxattrs) 5046 { 5047 struct xdr_stream *xdr = resp->xdr; 5048 u32 cookie_offset, count_offset, eof; 5049 u32 left, xdrleft, slen, count; 5050 u32 xdrlen, offset; 5051 u64 cookie; 5052 char *sp; 5053 __be32 status, tmp; 5054 __be32 *p; 5055 u32 nuser; 5056 5057 eof = 1; 5058 5059 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset); 5060 if (status) 5061 goto out; 5062 5063 /* 5064 * Reserve space for the cookie and the name array count. Record 5065 * the offsets to save them later. 5066 */ 5067 cookie_offset = xdr->buf->len; 5068 count_offset = cookie_offset + 8; 5069 p = xdr_reserve_space(xdr, 12); 5070 if (!p) { 5071 status = nfserr_resource; 5072 goto out; 5073 } 5074 5075 count = 0; 5076 left = listxattrs->lsxa_len; 5077 sp = listxattrs->lsxa_buf; 5078 nuser = 0; 5079 5080 xdrleft = listxattrs->lsxa_maxcount; 5081 5082 while (left > 0 && xdrleft > 0) { 5083 slen = strlen(sp); 5084 5085 /* 5086 * Check if this is a "user." attribute, skip it if not. 5087 */ 5088 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) 5089 goto contloop; 5090 5091 slen -= XATTR_USER_PREFIX_LEN; 5092 xdrlen = 4 + ((slen + 3) & ~3); 5093 if (xdrlen > xdrleft) { 5094 if (count == 0) { 5095 /* 5096 * Can't even fit the first attribute name. 5097 */ 5098 status = nfserr_toosmall; 5099 goto out; 5100 } 5101 eof = 0; 5102 goto wreof; 5103 } 5104 5105 left -= XATTR_USER_PREFIX_LEN; 5106 sp += XATTR_USER_PREFIX_LEN; 5107 if (nuser++ < offset) 5108 goto contloop; 5109 5110 5111 p = xdr_reserve_space(xdr, xdrlen); 5112 if (!p) { 5113 status = nfserr_resource; 5114 goto out; 5115 } 5116 5117 xdr_encode_opaque(p, sp, slen); 5118 5119 xdrleft -= xdrlen; 5120 count++; 5121 contloop: 5122 sp += slen + 1; 5123 left -= slen + 1; 5124 } 5125 5126 /* 5127 * If there were user attributes to copy, but we didn't copy 5128 * any, the offset was too large (e.g. the cookie was invalid). 5129 */ 5130 if (nuser > 0 && count == 0) { 5131 status = nfserr_badcookie; 5132 goto out; 5133 } 5134 5135 wreof: 5136 p = xdr_reserve_space(xdr, 4); 5137 if (!p) { 5138 status = nfserr_resource; 5139 goto out; 5140 } 5141 *p = cpu_to_be32(eof); 5142 5143 cookie = offset + count; 5144 5145 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8); 5146 tmp = cpu_to_be32(count); 5147 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4); 5148 out: 5149 if (listxattrs->lsxa_len) 5150 kvfree(listxattrs->lsxa_buf); 5151 return status; 5152 } 5153 5154 static __be32 5155 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5156 struct nfsd4_removexattr *removexattr) 5157 { 5158 struct xdr_stream *xdr = resp->xdr; 5159 __be32 *p; 5160 5161 p = xdr_reserve_space(xdr, 20); 5162 if (!p) 5163 return nfserr_resource; 5164 5165 p = encode_cinfo(p, &removexattr->rmxa_cinfo); 5166 return 0; 5167 } 5168 5169 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *); 5170 5171 /* 5172 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1 5173 * since we don't need to filter out obsolete ops as this is 5174 * done in the decoding phase. 5175 */ 5176 static const nfsd4_enc nfsd4_enc_ops[] = { 5177 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access, 5178 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close, 5179 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit, 5180 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create, 5181 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop, 5182 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop, 5183 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr, 5184 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh, 5185 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link, 5186 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock, 5187 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt, 5188 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku, 5189 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop, 5190 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop, 5191 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop, 5192 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open, 5193 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop, 5194 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm, 5195 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade, 5196 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop, 5197 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop, 5198 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop, 5199 [OP_READ] = (nfsd4_enc)nfsd4_encode_read, 5200 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir, 5201 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink, 5202 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove, 5203 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename, 5204 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop, 5205 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop, 5206 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop, 5207 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo, 5208 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr, 5209 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid, 5210 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop, 5211 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop, 5212 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write, 5213 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop, 5214 5215 /* NFSv4.1 operations */ 5216 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop, 5217 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session, 5218 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id, 5219 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session, 5220 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop, 5221 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop, 5222 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 5223 #ifdef CONFIG_NFSD_PNFS 5224 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo, 5225 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 5226 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit, 5227 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget, 5228 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn, 5229 #else 5230 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop, 5231 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 5232 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop, 5233 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop, 5234 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop, 5235 #endif 5236 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name, 5237 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence, 5238 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop, 5239 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid, 5240 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 5241 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop, 5242 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop, 5243 5244 /* NFSv4.2 operations */ 5245 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 5246 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy, 5247 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_copy_notify, 5248 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 5249 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop, 5250 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop, 5251 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop, 5252 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop, 5253 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_offload_status, 5254 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_read_plus, 5255 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek, 5256 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop, 5257 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop, 5258 5259 /* RFC 8276 extended atributes operations */ 5260 [OP_GETXATTR] = (nfsd4_enc)nfsd4_encode_getxattr, 5261 [OP_SETXATTR] = (nfsd4_enc)nfsd4_encode_setxattr, 5262 [OP_LISTXATTRS] = (nfsd4_enc)nfsd4_encode_listxattrs, 5263 [OP_REMOVEXATTR] = (nfsd4_enc)nfsd4_encode_removexattr, 5264 }; 5265 5266 /* 5267 * Calculate whether we still have space to encode repsize bytes. 5268 * There are two considerations: 5269 * - For NFS versions >=4.1, the size of the reply must stay within 5270 * session limits 5271 * - For all NFS versions, we must stay within limited preallocated 5272 * buffer space. 5273 * 5274 * This is called before the operation is processed, so can only provide 5275 * an upper estimate. For some nonidempotent operations (such as 5276 * getattr), it's not necessarily a problem if that estimate is wrong, 5277 * as we can fail it after processing without significant side effects. 5278 */ 5279 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize) 5280 { 5281 struct xdr_buf *buf = &resp->rqstp->rq_res; 5282 struct nfsd4_slot *slot = resp->cstate.slot; 5283 5284 if (buf->len + respsize <= buf->buflen) 5285 return nfs_ok; 5286 if (!nfsd4_has_session(&resp->cstate)) 5287 return nfserr_resource; 5288 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) { 5289 WARN_ON_ONCE(1); 5290 return nfserr_rep_too_big_to_cache; 5291 } 5292 return nfserr_rep_too_big; 5293 } 5294 5295 void 5296 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 5297 { 5298 struct xdr_stream *xdr = resp->xdr; 5299 struct nfs4_stateowner *so = resp->cstate.replay_owner; 5300 struct svc_rqst *rqstp = resp->rqstp; 5301 const struct nfsd4_operation *opdesc = op->opdesc; 5302 int post_err_offset; 5303 nfsd4_enc encoder; 5304 __be32 *p; 5305 5306 p = xdr_reserve_space(xdr, 8); 5307 if (!p) { 5308 WARN_ON_ONCE(1); 5309 return; 5310 } 5311 *p++ = cpu_to_be32(op->opnum); 5312 post_err_offset = xdr->buf->len; 5313 5314 if (op->opnum == OP_ILLEGAL) 5315 goto status; 5316 if (op->status && opdesc && 5317 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE)) 5318 goto status; 5319 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || 5320 !nfsd4_enc_ops[op->opnum]); 5321 encoder = nfsd4_enc_ops[op->opnum]; 5322 op->status = encoder(resp, op->status, &op->u); 5323 if (op->status) 5324 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status); 5325 if (opdesc && opdesc->op_release) 5326 opdesc->op_release(&op->u); 5327 xdr_commit_encode(xdr); 5328 5329 /* nfsd4_check_resp_size guarantees enough room for error status */ 5330 if (!op->status) { 5331 int space_needed = 0; 5332 if (!nfsd4_last_compound_op(rqstp)) 5333 space_needed = COMPOUND_ERR_SLACK_SPACE; 5334 op->status = nfsd4_check_resp_size(resp, space_needed); 5335 } 5336 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) { 5337 struct nfsd4_slot *slot = resp->cstate.slot; 5338 5339 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) 5340 op->status = nfserr_rep_too_big_to_cache; 5341 else 5342 op->status = nfserr_rep_too_big; 5343 } 5344 if (op->status == nfserr_resource || 5345 op->status == nfserr_rep_too_big || 5346 op->status == nfserr_rep_too_big_to_cache) { 5347 /* 5348 * The operation may have already been encoded or 5349 * partially encoded. No op returns anything additional 5350 * in the case of one of these three errors, so we can 5351 * just truncate back to after the status. But it's a 5352 * bug if we had to do this on a non-idempotent op: 5353 */ 5354 warn_on_nonidempotent_op(op); 5355 xdr_truncate_encode(xdr, post_err_offset); 5356 } 5357 if (so) { 5358 int len = xdr->buf->len - post_err_offset; 5359 5360 so->so_replay.rp_status = op->status; 5361 so->so_replay.rp_buflen = len; 5362 read_bytes_from_xdr_buf(xdr->buf, post_err_offset, 5363 so->so_replay.rp_buf, len); 5364 } 5365 status: 5366 *p = op->status; 5367 } 5368 5369 /* 5370 * Encode the reply stored in the stateowner reply cache 5371 * 5372 * XDR note: do not encode rp->rp_buflen: the buffer contains the 5373 * previously sent already encoded operation. 5374 */ 5375 void 5376 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op) 5377 { 5378 __be32 *p; 5379 struct nfs4_replay *rp = op->replay; 5380 5381 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen); 5382 if (!p) { 5383 WARN_ON_ONCE(1); 5384 return; 5385 } 5386 *p++ = cpu_to_be32(op->opnum); 5387 *p++ = rp->rp_status; /* already xdr'ed */ 5388 5389 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen); 5390 } 5391 5392 void nfsd4_release_compoundargs(struct svc_rqst *rqstp) 5393 { 5394 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5395 5396 if (args->ops != args->iops) { 5397 kfree(args->ops); 5398 args->ops = args->iops; 5399 } 5400 while (args->to_free) { 5401 struct svcxdr_tmpbuf *tb = args->to_free; 5402 args->to_free = tb->next; 5403 kfree(tb); 5404 } 5405 } 5406 5407 bool 5408 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5409 { 5410 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5411 5412 /* svcxdr_tmp_alloc */ 5413 args->to_free = NULL; 5414 5415 args->xdr = xdr; 5416 args->ops = args->iops; 5417 args->rqstp = rqstp; 5418 5419 return nfsd4_decode_compound(args); 5420 } 5421 5422 bool 5423 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5424 { 5425 struct nfsd4_compoundres *resp = rqstp->rq_resp; 5426 struct xdr_buf *buf = xdr->buf; 5427 __be32 *p; 5428 5429 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len + 5430 buf->tail[0].iov_len); 5431 5432 /* 5433 * Send buffer space for the following items is reserved 5434 * at the top of nfsd4_proc_compound(). 5435 */ 5436 p = resp->statusp; 5437 5438 *p++ = resp->cstate.status; 5439 5440 rqstp->rq_next_page = xdr->page_ptr + 1; 5441 5442 *p++ = htonl(resp->taglen); 5443 memcpy(p, resp->tag, resp->taglen); 5444 p += XDR_QUADLEN(resp->taglen); 5445 *p++ = htonl(resp->opcnt); 5446 5447 nfsd4_sequence_done(resp); 5448 return true; 5449 } 5450