1 /* 2 * Server-side XDR for NFSv4 3 * 4 * Copyright (c) 2002 The Regents of the University of Michigan. 5 * All rights reserved. 6 * 7 * Kendrick Smith <kmsmith@umich.edu> 8 * Andy Adamson <andros@umich.edu> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <linux/file.h> 37 #include <linux/slab.h> 38 #include <linux/namei.h> 39 #include <linux/statfs.h> 40 #include <linux/utsname.h> 41 #include <linux/pagemap.h> 42 #include <linux/sunrpc/svcauth_gss.h> 43 #include <linux/sunrpc/addr.h> 44 #include <linux/xattr.h> 45 #include <linux/vmalloc.h> 46 47 #include <uapi/linux/xattr.h> 48 49 #include "idmap.h" 50 #include "acl.h" 51 #include "xdr4.h" 52 #include "vfs.h" 53 #include "state.h" 54 #include "cache.h" 55 #include "netns.h" 56 #include "pnfs.h" 57 #include "filecache.h" 58 59 #include "trace.h" 60 61 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 62 #include <linux/security.h> 63 #endif 64 65 66 #define NFSDDBG_FACILITY NFSDDBG_XDR 67 68 const u32 nfsd_suppattrs[3][3] = { 69 {NFSD4_SUPPORTED_ATTRS_WORD0, 70 NFSD4_SUPPORTED_ATTRS_WORD1, 71 NFSD4_SUPPORTED_ATTRS_WORD2}, 72 73 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 74 NFSD4_1_SUPPORTED_ATTRS_WORD1, 75 NFSD4_1_SUPPORTED_ATTRS_WORD2}, 76 77 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 78 NFSD4_1_SUPPORTED_ATTRS_WORD1, 79 NFSD4_2_SUPPORTED_ATTRS_WORD2}, 80 }; 81 82 /* 83 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing 84 * directory in order to indicate to the client that a filesystem boundary is present 85 * We use a fixed fsid for a referral 86 */ 87 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL 88 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL 89 90 static __be32 91 check_filename(char *str, int len) 92 { 93 int i; 94 95 if (len == 0) 96 return nfserr_inval; 97 if (len > NFS4_MAXNAMLEN) 98 return nfserr_nametoolong; 99 if (isdotent(str, len)) 100 return nfserr_badname; 101 for (i = 0; i < len; i++) 102 if (str[i] == '/') 103 return nfserr_badname; 104 return 0; 105 } 106 107 static int zero_clientid(clientid_t *clid) 108 { 109 return (clid->cl_boot == 0) && (clid->cl_id == 0); 110 } 111 112 /** 113 * svcxdr_tmpalloc - allocate memory to be freed after compound processing 114 * @argp: NFSv4 compound argument structure 115 * @len: length of buffer to allocate 116 * 117 * Allocates a buffer of size @len to be freed when processing the compound 118 * operation described in @argp finishes. 119 */ 120 static void * 121 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len) 122 { 123 struct svcxdr_tmpbuf *tb; 124 125 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL); 126 if (!tb) 127 return NULL; 128 tb->next = argp->to_free; 129 argp->to_free = tb; 130 return tb->buf; 131 } 132 133 /* 134 * For xdr strings that need to be passed to other kernel api's 135 * as null-terminated strings. 136 * 137 * Note null-terminating in place usually isn't safe since the 138 * buffer might end on a page boundary. 139 */ 140 static char * 141 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len) 142 { 143 char *p = svcxdr_tmpalloc(argp, len + 1); 144 145 if (!p) 146 return NULL; 147 memcpy(p, buf, len); 148 p[len] = '\0'; 149 return p; 150 } 151 152 static void * 153 svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, u32 len) 154 { 155 __be32 *tmp; 156 157 /* 158 * The location of the decoded data item is stable, 159 * so @p is OK to use. This is the common case. 160 */ 161 if (p != argp->xdr->scratch.iov_base) 162 return p; 163 164 tmp = svcxdr_tmpalloc(argp, len); 165 if (!tmp) 166 return NULL; 167 memcpy(tmp, p, len); 168 return tmp; 169 } 170 171 /* 172 * NFSv4 basic data type decoders 173 */ 174 175 /* 176 * This helper handles variable-length opaques which belong to protocol 177 * elements that this implementation does not support. 178 */ 179 static __be32 180 nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen) 181 { 182 u32 len; 183 184 if (xdr_stream_decode_u32(argp->xdr, &len) < 0) 185 return nfserr_bad_xdr; 186 if (maxlen && len > maxlen) 187 return nfserr_bad_xdr; 188 if (!xdr_inline_decode(argp->xdr, len)) 189 return nfserr_bad_xdr; 190 191 return nfs_ok; 192 } 193 194 static __be32 195 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o) 196 { 197 __be32 *p; 198 u32 len; 199 200 if (xdr_stream_decode_u32(argp->xdr, &len) < 0) 201 return nfserr_bad_xdr; 202 if (len == 0 || len > NFS4_OPAQUE_LIMIT) 203 return nfserr_bad_xdr; 204 p = xdr_inline_decode(argp->xdr, len); 205 if (!p) 206 return nfserr_bad_xdr; 207 o->data = svcxdr_savemem(argp, p, len); 208 if (!o->data) 209 return nfserr_jukebox; 210 o->len = len; 211 212 return nfs_ok; 213 } 214 215 static __be32 216 nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp) 217 { 218 __be32 *p, status; 219 220 if (xdr_stream_decode_u32(argp->xdr, lenp) < 0) 221 return nfserr_bad_xdr; 222 p = xdr_inline_decode(argp->xdr, *lenp); 223 if (!p) 224 return nfserr_bad_xdr; 225 status = check_filename((char *)p, *lenp); 226 if (status) 227 return status; 228 *namp = svcxdr_savemem(argp, p, *lenp); 229 if (!*namp) 230 return nfserr_jukebox; 231 232 return nfs_ok; 233 } 234 235 static __be32 236 nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv) 237 { 238 __be32 *p; 239 240 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3); 241 if (!p) 242 return nfserr_bad_xdr; 243 p = xdr_decode_hyper(p, &tv->tv_sec); 244 tv->tv_nsec = be32_to_cpup(p++); 245 if (tv->tv_nsec >= (u32)1000000000) 246 return nfserr_inval; 247 return nfs_ok; 248 } 249 250 static __be32 251 nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf) 252 { 253 __be32 *p; 254 255 p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE); 256 if (!p) 257 return nfserr_bad_xdr; 258 memcpy(verf->data, p, sizeof(verf->data)); 259 return nfs_ok; 260 } 261 262 /** 263 * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4 264 * @argp: NFSv4 compound argument structure 265 * @bmval: pointer to an array of u32's to decode into 266 * @bmlen: size of the @bmval array 267 * 268 * The server needs to return nfs_ok rather than nfserr_bad_xdr when 269 * encountering bitmaps containing bits it does not recognize. This 270 * includes bits in bitmap words past WORDn, where WORDn is the last 271 * bitmap WORD the implementation currently supports. Thus we are 272 * careful here to simply ignore bits in bitmap words that this 273 * implementation has yet to support explicitly. 274 * 275 * Return values: 276 * %nfs_ok: @bmval populated successfully 277 * %nfserr_bad_xdr: the encoded bitmap was invalid 278 */ 279 static __be32 280 nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen) 281 { 282 ssize_t status; 283 284 status = xdr_stream_decode_uint32_array(argp->xdr, bmval, bmlen); 285 return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok; 286 } 287 288 static __be32 289 nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace) 290 { 291 __be32 *p, status; 292 u32 length; 293 294 if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0) 295 return nfserr_bad_xdr; 296 if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0) 297 return nfserr_bad_xdr; 298 if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0) 299 return nfserr_bad_xdr; 300 301 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 302 return nfserr_bad_xdr; 303 p = xdr_inline_decode(argp->xdr, length); 304 if (!p) 305 return nfserr_bad_xdr; 306 ace->whotype = nfs4_acl_get_whotype((char *)p, length); 307 if (ace->whotype != NFS4_ACL_WHO_NAMED) 308 status = nfs_ok; 309 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 310 status = nfsd_map_name_to_gid(argp->rqstp, 311 (char *)p, length, &ace->who_gid); 312 else 313 status = nfsd_map_name_to_uid(argp->rqstp, 314 (char *)p, length, &ace->who_uid); 315 316 return status; 317 } 318 319 /* A counted array of nfsace4's */ 320 static noinline __be32 321 nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl) 322 { 323 struct nfs4_ace *ace; 324 __be32 status; 325 u32 count; 326 327 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 328 return nfserr_bad_xdr; 329 330 if (count > xdr_stream_remaining(argp->xdr) / 20) 331 /* 332 * Even with 4-byte names there wouldn't be 333 * space for that many aces; something fishy is 334 * going on: 335 */ 336 return nfserr_fbig; 337 338 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count)); 339 if (*acl == NULL) 340 return nfserr_jukebox; 341 342 (*acl)->naces = count; 343 for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) { 344 status = nfsd4_decode_nfsace4(argp, ace); 345 if (status) 346 return status; 347 } 348 349 return nfs_ok; 350 } 351 352 static noinline __be32 353 nfsd4_decode_security_label(struct nfsd4_compoundargs *argp, 354 struct xdr_netobj *label) 355 { 356 u32 lfs, pi, length; 357 __be32 *p; 358 359 if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0) 360 return nfserr_bad_xdr; 361 if (xdr_stream_decode_u32(argp->xdr, &pi) < 0) 362 return nfserr_bad_xdr; 363 364 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 365 return nfserr_bad_xdr; 366 if (length > NFS4_MAXLABELLEN) 367 return nfserr_badlabel; 368 p = xdr_inline_decode(argp->xdr, length); 369 if (!p) 370 return nfserr_bad_xdr; 371 label->len = length; 372 label->data = svcxdr_dupstr(argp, p, length); 373 if (!label->data) 374 return nfserr_jukebox; 375 376 return nfs_ok; 377 } 378 379 static __be32 380 nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen, 381 struct iattr *iattr, struct nfs4_acl **acl, 382 struct xdr_netobj *label, int *umask) 383 { 384 unsigned int starting_pos; 385 u32 attrlist4_count; 386 __be32 *p, status; 387 388 iattr->ia_valid = 0; 389 status = nfsd4_decode_bitmap4(argp, bmval, bmlen); 390 if (status) 391 return nfserr_bad_xdr; 392 393 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0 394 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1 395 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) { 396 if (nfsd_attrs_supported(argp->minorversion, bmval)) 397 return nfserr_inval; 398 return nfserr_attrnotsupp; 399 } 400 401 if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0) 402 return nfserr_bad_xdr; 403 starting_pos = xdr_stream_pos(argp->xdr); 404 405 if (bmval[0] & FATTR4_WORD0_SIZE) { 406 u64 size; 407 408 if (xdr_stream_decode_u64(argp->xdr, &size) < 0) 409 return nfserr_bad_xdr; 410 iattr->ia_size = size; 411 iattr->ia_valid |= ATTR_SIZE; 412 } 413 if (bmval[0] & FATTR4_WORD0_ACL) { 414 status = nfsd4_decode_acl(argp, acl); 415 if (status) 416 return status; 417 } else 418 *acl = NULL; 419 if (bmval[1] & FATTR4_WORD1_MODE) { 420 u32 mode; 421 422 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0) 423 return nfserr_bad_xdr; 424 iattr->ia_mode = mode; 425 iattr->ia_mode &= (S_IFMT | S_IALLUGO); 426 iattr->ia_valid |= ATTR_MODE; 427 } 428 if (bmval[1] & FATTR4_WORD1_OWNER) { 429 u32 length; 430 431 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 432 return nfserr_bad_xdr; 433 p = xdr_inline_decode(argp->xdr, length); 434 if (!p) 435 return nfserr_bad_xdr; 436 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length, 437 &iattr->ia_uid); 438 if (status) 439 return status; 440 iattr->ia_valid |= ATTR_UID; 441 } 442 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { 443 u32 length; 444 445 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 446 return nfserr_bad_xdr; 447 p = xdr_inline_decode(argp->xdr, length); 448 if (!p) 449 return nfserr_bad_xdr; 450 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length, 451 &iattr->ia_gid); 452 if (status) 453 return status; 454 iattr->ia_valid |= ATTR_GID; 455 } 456 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { 457 u32 set_it; 458 459 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0) 460 return nfserr_bad_xdr; 461 switch (set_it) { 462 case NFS4_SET_TO_CLIENT_TIME: 463 status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime); 464 if (status) 465 return status; 466 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 467 break; 468 case NFS4_SET_TO_SERVER_TIME: 469 iattr->ia_valid |= ATTR_ATIME; 470 break; 471 default: 472 return nfserr_bad_xdr; 473 } 474 } 475 if (bmval[1] & FATTR4_WORD1_TIME_CREATE) { 476 struct timespec64 ts; 477 478 /* No Linux filesystem supports setting this attribute. */ 479 bmval[1] &= ~FATTR4_WORD1_TIME_CREATE; 480 status = nfsd4_decode_nfstime4(argp, &ts); 481 if (status) 482 return status; 483 } 484 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 485 u32 set_it; 486 487 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0) 488 return nfserr_bad_xdr; 489 switch (set_it) { 490 case NFS4_SET_TO_CLIENT_TIME: 491 status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime); 492 if (status) 493 return status; 494 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 495 break; 496 case NFS4_SET_TO_SERVER_TIME: 497 iattr->ia_valid |= ATTR_MTIME; 498 break; 499 default: 500 return nfserr_bad_xdr; 501 } 502 } 503 label->len = 0; 504 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) && 505 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) { 506 status = nfsd4_decode_security_label(argp, label); 507 if (status) 508 return status; 509 } 510 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) { 511 u32 mode, mask; 512 513 if (!umask) 514 return nfserr_bad_xdr; 515 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0) 516 return nfserr_bad_xdr; 517 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO); 518 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0) 519 return nfserr_bad_xdr; 520 *umask = mask & S_IRWXUGO; 521 iattr->ia_valid |= ATTR_MODE; 522 } 523 524 /* request sanity: did attrlist4 contain the expected number of words? */ 525 if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos) 526 return nfserr_bad_xdr; 527 528 return nfs_ok; 529 } 530 531 static __be32 532 nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid) 533 { 534 __be32 *p; 535 536 p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE); 537 if (!p) 538 return nfserr_bad_xdr; 539 sid->si_generation = be32_to_cpup(p++); 540 memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque)); 541 return nfs_ok; 542 } 543 544 static __be32 545 nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid) 546 { 547 __be32 *p; 548 549 p = xdr_inline_decode(argp->xdr, sizeof(__be64)); 550 if (!p) 551 return nfserr_bad_xdr; 552 memcpy(clientid, p, sizeof(*clientid)); 553 return nfs_ok; 554 } 555 556 static __be32 557 nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp, 558 clientid_t *clientid, struct xdr_netobj *owner) 559 { 560 __be32 status; 561 562 status = nfsd4_decode_clientid4(argp, clientid); 563 if (status) 564 return status; 565 return nfsd4_decode_opaque(argp, owner); 566 } 567 568 #ifdef CONFIG_NFSD_PNFS 569 static __be32 570 nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp, 571 struct nfsd4_deviceid *devid) 572 { 573 __be32 *p; 574 575 p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE); 576 if (!p) 577 return nfserr_bad_xdr; 578 memcpy(devid, p, sizeof(*devid)); 579 return nfs_ok; 580 } 581 582 static __be32 583 nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp, 584 struct nfsd4_layoutcommit *lcp) 585 { 586 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0) 587 return nfserr_bad_xdr; 588 if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES) 589 return nfserr_bad_xdr; 590 if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX) 591 return nfserr_bad_xdr; 592 593 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0) 594 return nfserr_bad_xdr; 595 if (lcp->lc_up_len > 0) { 596 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len); 597 if (!lcp->lc_up_layout) 598 return nfserr_bad_xdr; 599 } 600 601 return nfs_ok; 602 } 603 604 static __be32 605 nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp, 606 struct nfsd4_layoutreturn *lrp) 607 { 608 __be32 status; 609 610 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0) 611 return nfserr_bad_xdr; 612 switch (lrp->lr_return_type) { 613 case RETURN_FILE: 614 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0) 615 return nfserr_bad_xdr; 616 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0) 617 return nfserr_bad_xdr; 618 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid); 619 if (status) 620 return status; 621 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0) 622 return nfserr_bad_xdr; 623 if (lrp->lrf_body_len > 0) { 624 lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len); 625 if (!lrp->lrf_body) 626 return nfserr_bad_xdr; 627 } 628 break; 629 case RETURN_FSID: 630 case RETURN_ALL: 631 lrp->lr_seg.offset = 0; 632 lrp->lr_seg.length = NFS4_MAX_UINT64; 633 break; 634 default: 635 return nfserr_bad_xdr; 636 } 637 638 return nfs_ok; 639 } 640 641 #endif /* CONFIG_NFSD_PNFS */ 642 643 static __be32 644 nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp, 645 struct nfs4_sessionid *sessionid) 646 { 647 __be32 *p; 648 649 p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN); 650 if (!p) 651 return nfserr_bad_xdr; 652 memcpy(sessionid->data, p, sizeof(sessionid->data)); 653 return nfs_ok; 654 } 655 656 /* Defined in Appendix A of RFC 5531 */ 657 static __be32 658 nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp, 659 struct nfsd4_cb_sec *cbs) 660 { 661 u32 stamp, gidcount, uid, gid; 662 __be32 *p, status; 663 664 if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0) 665 return nfserr_bad_xdr; 666 /* machine name */ 667 status = nfsd4_decode_ignored_string(argp, 255); 668 if (status) 669 return status; 670 if (xdr_stream_decode_u32(argp->xdr, &uid) < 0) 671 return nfserr_bad_xdr; 672 if (xdr_stream_decode_u32(argp->xdr, &gid) < 0) 673 return nfserr_bad_xdr; 674 if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0) 675 return nfserr_bad_xdr; 676 if (gidcount > 16) 677 return nfserr_bad_xdr; 678 p = xdr_inline_decode(argp->xdr, gidcount << 2); 679 if (!p) 680 return nfserr_bad_xdr; 681 if (cbs->flavor == (u32)(-1)) { 682 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp); 683 684 kuid_t kuid = make_kuid(userns, uid); 685 kgid_t kgid = make_kgid(userns, gid); 686 if (uid_valid(kuid) && gid_valid(kgid)) { 687 cbs->uid = kuid; 688 cbs->gid = kgid; 689 cbs->flavor = RPC_AUTH_UNIX; 690 } else { 691 dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n"); 692 } 693 } 694 695 return nfs_ok; 696 } 697 698 static __be32 699 nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp, 700 struct nfsd4_cb_sec *cbs) 701 { 702 __be32 status; 703 u32 service; 704 705 dprintk("RPC_AUTH_GSS callback secflavor not supported!\n"); 706 707 if (xdr_stream_decode_u32(argp->xdr, &service) < 0) 708 return nfserr_bad_xdr; 709 if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY) 710 return nfserr_bad_xdr; 711 /* gcbp_handle_from_server */ 712 status = nfsd4_decode_ignored_string(argp, 0); 713 if (status) 714 return status; 715 /* gcbp_handle_from_client */ 716 status = nfsd4_decode_ignored_string(argp, 0); 717 if (status) 718 return status; 719 720 return nfs_ok; 721 } 722 723 /* a counted array of callback_sec_parms4 items */ 724 static __be32 725 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs) 726 { 727 u32 i, secflavor, nr_secflavs; 728 __be32 status; 729 730 /* callback_sec_params4 */ 731 if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0) 732 return nfserr_bad_xdr; 733 if (nr_secflavs) 734 cbs->flavor = (u32)(-1); 735 else 736 /* Is this legal? Be generous, take it to mean AUTH_NONE: */ 737 cbs->flavor = 0; 738 739 for (i = 0; i < nr_secflavs; ++i) { 740 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0) 741 return nfserr_bad_xdr; 742 switch (secflavor) { 743 case RPC_AUTH_NULL: 744 /* void */ 745 if (cbs->flavor == (u32)(-1)) 746 cbs->flavor = RPC_AUTH_NULL; 747 break; 748 case RPC_AUTH_UNIX: 749 status = nfsd4_decode_authsys_parms(argp, cbs); 750 if (status) 751 return status; 752 break; 753 case RPC_AUTH_GSS: 754 status = nfsd4_decode_gss_cb_handles4(argp, cbs); 755 if (status) 756 return status; 757 break; 758 default: 759 return nfserr_inval; 760 } 761 } 762 763 return nfs_ok; 764 } 765 766 767 /* 768 * NFSv4 operation argument decoders 769 */ 770 771 static __be32 772 nfsd4_decode_access(struct nfsd4_compoundargs *argp, 773 union nfsd4_op_u *u) 774 { 775 struct nfsd4_access *access = &u->access; 776 if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0) 777 return nfserr_bad_xdr; 778 return nfs_ok; 779 } 780 781 static __be32 782 nfsd4_decode_close(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 783 { 784 struct nfsd4_close *close = &u->close; 785 if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0) 786 return nfserr_bad_xdr; 787 return nfsd4_decode_stateid4(argp, &close->cl_stateid); 788 } 789 790 791 static __be32 792 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 793 { 794 struct nfsd4_commit *commit = &u->commit; 795 if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0) 796 return nfserr_bad_xdr; 797 if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0) 798 return nfserr_bad_xdr; 799 memset(&commit->co_verf, 0, sizeof(commit->co_verf)); 800 return nfs_ok; 801 } 802 803 static __be32 804 nfsd4_decode_create(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 805 { 806 struct nfsd4_create *create = &u->create; 807 __be32 *p, status; 808 809 memset(create, 0, sizeof(*create)); 810 if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0) 811 return nfserr_bad_xdr; 812 switch (create->cr_type) { 813 case NF4LNK: 814 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0) 815 return nfserr_bad_xdr; 816 p = xdr_inline_decode(argp->xdr, create->cr_datalen); 817 if (!p) 818 return nfserr_bad_xdr; 819 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen); 820 if (!create->cr_data) 821 return nfserr_jukebox; 822 break; 823 case NF4BLK: 824 case NF4CHR: 825 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0) 826 return nfserr_bad_xdr; 827 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0) 828 return nfserr_bad_xdr; 829 break; 830 case NF4SOCK: 831 case NF4FIFO: 832 case NF4DIR: 833 default: 834 break; 835 } 836 status = nfsd4_decode_component4(argp, &create->cr_name, 837 &create->cr_namelen); 838 if (status) 839 return status; 840 status = nfsd4_decode_fattr4(argp, create->cr_bmval, 841 ARRAY_SIZE(create->cr_bmval), 842 &create->cr_iattr, &create->cr_acl, 843 &create->cr_label, &create->cr_umask); 844 if (status) 845 return status; 846 847 return nfs_ok; 848 } 849 850 static inline __be32 851 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 852 { 853 struct nfsd4_delegreturn *dr = &u->delegreturn; 854 return nfsd4_decode_stateid4(argp, &dr->dr_stateid); 855 } 856 857 static inline __be32 858 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 859 { 860 struct nfsd4_getattr *getattr = &u->getattr; 861 memset(getattr, 0, sizeof(*getattr)); 862 return nfsd4_decode_bitmap4(argp, getattr->ga_bmval, 863 ARRAY_SIZE(getattr->ga_bmval)); 864 } 865 866 static __be32 867 nfsd4_decode_link(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 868 { 869 struct nfsd4_link *link = &u->link; 870 memset(link, 0, sizeof(*link)); 871 return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen); 872 } 873 874 static __be32 875 nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp, 876 struct nfsd4_lock *lock) 877 { 878 __be32 status; 879 880 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0) 881 return nfserr_bad_xdr; 882 status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid); 883 if (status) 884 return status; 885 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0) 886 return nfserr_bad_xdr; 887 return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid, 888 &lock->lk_new_owner); 889 } 890 891 static __be32 892 nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp, 893 struct nfsd4_lock *lock) 894 { 895 __be32 status; 896 897 status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid); 898 if (status) 899 return status; 900 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0) 901 return nfserr_bad_xdr; 902 903 return nfs_ok; 904 } 905 906 static __be32 907 nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 908 { 909 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0) 910 return nfserr_bad_xdr; 911 if (lock->lk_is_new) 912 return nfsd4_decode_open_to_lock_owner4(argp, lock); 913 return nfsd4_decode_exist_lock_owner4(argp, lock); 914 } 915 916 static __be32 917 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 918 { 919 struct nfsd4_lock *lock = &u->lock; 920 memset(lock, 0, sizeof(*lock)); 921 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0) 922 return nfserr_bad_xdr; 923 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 924 return nfserr_bad_xdr; 925 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0) 926 return nfserr_bad_xdr; 927 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0) 928 return nfserr_bad_xdr; 929 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0) 930 return nfserr_bad_xdr; 931 return nfsd4_decode_locker4(argp, lock); 932 } 933 934 static __be32 935 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 936 { 937 struct nfsd4_lockt *lockt = &u->lockt; 938 memset(lockt, 0, sizeof(*lockt)); 939 if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0) 940 return nfserr_bad_xdr; 941 if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 942 return nfserr_bad_xdr; 943 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0) 944 return nfserr_bad_xdr; 945 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0) 946 return nfserr_bad_xdr; 947 return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid, 948 &lockt->lt_owner); 949 } 950 951 static __be32 952 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 953 { 954 struct nfsd4_locku *locku = &u->locku; 955 __be32 status; 956 957 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0) 958 return nfserr_bad_xdr; 959 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 960 return nfserr_bad_xdr; 961 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0) 962 return nfserr_bad_xdr; 963 status = nfsd4_decode_stateid4(argp, &locku->lu_stateid); 964 if (status) 965 return status; 966 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0) 967 return nfserr_bad_xdr; 968 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0) 969 return nfserr_bad_xdr; 970 971 return nfs_ok; 972 } 973 974 static __be32 975 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 976 { 977 struct nfsd4_lookup *lookup = &u->lookup; 978 return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len); 979 } 980 981 static __be32 982 nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 983 { 984 __be32 status; 985 986 if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0) 987 return nfserr_bad_xdr; 988 switch (open->op_createmode) { 989 case NFS4_CREATE_UNCHECKED: 990 case NFS4_CREATE_GUARDED: 991 status = nfsd4_decode_fattr4(argp, open->op_bmval, 992 ARRAY_SIZE(open->op_bmval), 993 &open->op_iattr, &open->op_acl, 994 &open->op_label, &open->op_umask); 995 if (status) 996 return status; 997 break; 998 case NFS4_CREATE_EXCLUSIVE: 999 status = nfsd4_decode_verifier4(argp, &open->op_verf); 1000 if (status) 1001 return status; 1002 break; 1003 case NFS4_CREATE_EXCLUSIVE4_1: 1004 if (argp->minorversion < 1) 1005 return nfserr_bad_xdr; 1006 status = nfsd4_decode_verifier4(argp, &open->op_verf); 1007 if (status) 1008 return status; 1009 status = nfsd4_decode_fattr4(argp, open->op_bmval, 1010 ARRAY_SIZE(open->op_bmval), 1011 &open->op_iattr, &open->op_acl, 1012 &open->op_label, &open->op_umask); 1013 if (status) 1014 return status; 1015 break; 1016 default: 1017 return nfserr_bad_xdr; 1018 } 1019 1020 return nfs_ok; 1021 } 1022 1023 static __be32 1024 nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 1025 { 1026 __be32 status; 1027 1028 if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0) 1029 return nfserr_bad_xdr; 1030 switch (open->op_create) { 1031 case NFS4_OPEN_NOCREATE: 1032 break; 1033 case NFS4_OPEN_CREATE: 1034 status = nfsd4_decode_createhow4(argp, open); 1035 if (status) 1036 return status; 1037 break; 1038 default: 1039 return nfserr_bad_xdr; 1040 } 1041 1042 return nfs_ok; 1043 } 1044 1045 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when) 1046 { 1047 u32 w; 1048 1049 if (xdr_stream_decode_u32(argp->xdr, &w) < 0) 1050 return nfserr_bad_xdr; 1051 *share_access = w & NFS4_SHARE_ACCESS_MASK; 1052 *deleg_want = w & NFS4_SHARE_WANT_MASK; 1053 if (deleg_when) 1054 *deleg_when = w & NFS4_SHARE_WHEN_MASK; 1055 1056 switch (w & NFS4_SHARE_ACCESS_MASK) { 1057 case NFS4_SHARE_ACCESS_READ: 1058 case NFS4_SHARE_ACCESS_WRITE: 1059 case NFS4_SHARE_ACCESS_BOTH: 1060 break; 1061 default: 1062 return nfserr_bad_xdr; 1063 } 1064 w &= ~NFS4_SHARE_ACCESS_MASK; 1065 if (!w) 1066 return nfs_ok; 1067 if (!argp->minorversion) 1068 return nfserr_bad_xdr; 1069 switch (w & NFS4_SHARE_WANT_MASK) { 1070 case NFS4_SHARE_WANT_NO_PREFERENCE: 1071 case NFS4_SHARE_WANT_READ_DELEG: 1072 case NFS4_SHARE_WANT_WRITE_DELEG: 1073 case NFS4_SHARE_WANT_ANY_DELEG: 1074 case NFS4_SHARE_WANT_NO_DELEG: 1075 case NFS4_SHARE_WANT_CANCEL: 1076 break; 1077 default: 1078 return nfserr_bad_xdr; 1079 } 1080 w &= ~NFS4_SHARE_WANT_MASK; 1081 if (!w) 1082 return nfs_ok; 1083 1084 if (!deleg_when) /* open_downgrade */ 1085 return nfserr_inval; 1086 switch (w) { 1087 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL: 1088 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED: 1089 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL | 1090 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED): 1091 return nfs_ok; 1092 } 1093 return nfserr_bad_xdr; 1094 } 1095 1096 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x) 1097 { 1098 if (xdr_stream_decode_u32(argp->xdr, x) < 0) 1099 return nfserr_bad_xdr; 1100 /* Note: unlike access bits, deny bits may be zero. */ 1101 if (*x & ~NFS4_SHARE_DENY_BOTH) 1102 return nfserr_bad_xdr; 1103 1104 return nfs_ok; 1105 } 1106 1107 static __be32 1108 nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp, 1109 struct nfsd4_open *open) 1110 { 1111 __be32 status; 1112 1113 if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0) 1114 return nfserr_bad_xdr; 1115 switch (open->op_claim_type) { 1116 case NFS4_OPEN_CLAIM_NULL: 1117 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1118 status = nfsd4_decode_component4(argp, &open->op_fname, 1119 &open->op_fnamelen); 1120 if (status) 1121 return status; 1122 break; 1123 case NFS4_OPEN_CLAIM_PREVIOUS: 1124 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0) 1125 return nfserr_bad_xdr; 1126 break; 1127 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1128 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid); 1129 if (status) 1130 return status; 1131 status = nfsd4_decode_component4(argp, &open->op_fname, 1132 &open->op_fnamelen); 1133 if (status) 1134 return status; 1135 break; 1136 case NFS4_OPEN_CLAIM_FH: 1137 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1138 if (argp->minorversion < 1) 1139 return nfserr_bad_xdr; 1140 /* void */ 1141 break; 1142 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1143 if (argp->minorversion < 1) 1144 return nfserr_bad_xdr; 1145 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid); 1146 if (status) 1147 return status; 1148 break; 1149 default: 1150 return nfserr_bad_xdr; 1151 } 1152 1153 return nfs_ok; 1154 } 1155 1156 static __be32 1157 nfsd4_decode_open(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1158 { 1159 struct nfsd4_open *open = &u->open; 1160 __be32 status; 1161 u32 dummy; 1162 1163 memset(open, 0, sizeof(*open)); 1164 1165 if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0) 1166 return nfserr_bad_xdr; 1167 /* deleg_want is ignored */ 1168 status = nfsd4_decode_share_access(argp, &open->op_share_access, 1169 &open->op_deleg_want, &dummy); 1170 if (status) 1171 return status; 1172 status = nfsd4_decode_share_deny(argp, &open->op_share_deny); 1173 if (status) 1174 return status; 1175 status = nfsd4_decode_state_owner4(argp, &open->op_clientid, 1176 &open->op_owner); 1177 if (status) 1178 return status; 1179 status = nfsd4_decode_openflag4(argp, open); 1180 if (status) 1181 return status; 1182 return nfsd4_decode_open_claim4(argp, open); 1183 } 1184 1185 static __be32 1186 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, 1187 union nfsd4_op_u *u) 1188 { 1189 struct nfsd4_open_confirm *open_conf = &u->open_confirm; 1190 __be32 status; 1191 1192 if (argp->minorversion >= 1) 1193 return nfserr_notsupp; 1194 1195 status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid); 1196 if (status) 1197 return status; 1198 if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0) 1199 return nfserr_bad_xdr; 1200 1201 memset(&open_conf->oc_resp_stateid, 0, 1202 sizeof(open_conf->oc_resp_stateid)); 1203 return nfs_ok; 1204 } 1205 1206 static __be32 1207 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, 1208 union nfsd4_op_u *u) 1209 { 1210 struct nfsd4_open_downgrade *open_down = &u->open_downgrade; 1211 __be32 status; 1212 1213 memset(open_down, 0, sizeof(*open_down)); 1214 status = nfsd4_decode_stateid4(argp, &open_down->od_stateid); 1215 if (status) 1216 return status; 1217 if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0) 1218 return nfserr_bad_xdr; 1219 /* deleg_want is ignored */ 1220 status = nfsd4_decode_share_access(argp, &open_down->od_share_access, 1221 &open_down->od_deleg_want, NULL); 1222 if (status) 1223 return status; 1224 return nfsd4_decode_share_deny(argp, &open_down->od_share_deny); 1225 } 1226 1227 static __be32 1228 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1229 { 1230 struct nfsd4_putfh *putfh = &u->putfh; 1231 __be32 *p; 1232 1233 if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0) 1234 return nfserr_bad_xdr; 1235 if (putfh->pf_fhlen > NFS4_FHSIZE) 1236 return nfserr_bad_xdr; 1237 p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen); 1238 if (!p) 1239 return nfserr_bad_xdr; 1240 putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen); 1241 if (!putfh->pf_fhval) 1242 return nfserr_jukebox; 1243 1244 putfh->no_verify = false; 1245 return nfs_ok; 1246 } 1247 1248 static __be32 1249 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p) 1250 { 1251 if (argp->minorversion == 0) 1252 return nfs_ok; 1253 return nfserr_notsupp; 1254 } 1255 1256 static __be32 1257 nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1258 { 1259 struct nfsd4_read *read = &u->read; 1260 __be32 status; 1261 1262 memset(read, 0, sizeof(*read)); 1263 status = nfsd4_decode_stateid4(argp, &read->rd_stateid); 1264 if (status) 1265 return status; 1266 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0) 1267 return nfserr_bad_xdr; 1268 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0) 1269 return nfserr_bad_xdr; 1270 1271 return nfs_ok; 1272 } 1273 1274 static __be32 1275 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1276 { 1277 struct nfsd4_readdir *readdir = &u->readdir; 1278 __be32 status; 1279 1280 memset(readdir, 0, sizeof(*readdir)); 1281 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0) 1282 return nfserr_bad_xdr; 1283 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf); 1284 if (status) 1285 return status; 1286 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0) 1287 return nfserr_bad_xdr; 1288 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0) 1289 return nfserr_bad_xdr; 1290 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval, 1291 ARRAY_SIZE(readdir->rd_bmval)) < 0) 1292 return nfserr_bad_xdr; 1293 1294 return nfs_ok; 1295 } 1296 1297 static __be32 1298 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1299 { 1300 struct nfsd4_remove *remove = &u->remove; 1301 memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo)); 1302 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen); 1303 } 1304 1305 static __be32 1306 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1307 { 1308 struct nfsd4_rename *rename = &u->rename; 1309 __be32 status; 1310 1311 memset(rename, 0, sizeof(*rename)); 1312 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen); 1313 if (status) 1314 return status; 1315 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen); 1316 } 1317 1318 static __be32 1319 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1320 { 1321 clientid_t *clientid = &u->renew; 1322 return nfsd4_decode_clientid4(argp, clientid); 1323 } 1324 1325 static __be32 1326 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp, 1327 union nfsd4_op_u *u) 1328 { 1329 struct nfsd4_secinfo *secinfo = &u->secinfo; 1330 secinfo->si_exp = NULL; 1331 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen); 1332 } 1333 1334 static __be32 1335 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1336 { 1337 struct nfsd4_setattr *setattr = &u->setattr; 1338 __be32 status; 1339 1340 memset(setattr, 0, sizeof(*setattr)); 1341 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid); 1342 if (status) 1343 return status; 1344 return nfsd4_decode_fattr4(argp, setattr->sa_bmval, 1345 ARRAY_SIZE(setattr->sa_bmval), 1346 &setattr->sa_iattr, &setattr->sa_acl, 1347 &setattr->sa_label, NULL); 1348 } 1349 1350 static __be32 1351 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1352 { 1353 struct nfsd4_setclientid *setclientid = &u->setclientid; 1354 __be32 *p, status; 1355 1356 memset(setclientid, 0, sizeof(*setclientid)); 1357 1358 if (argp->minorversion >= 1) 1359 return nfserr_notsupp; 1360 1361 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf); 1362 if (status) 1363 return status; 1364 status = nfsd4_decode_opaque(argp, &setclientid->se_name); 1365 if (status) 1366 return status; 1367 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0) 1368 return nfserr_bad_xdr; 1369 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0) 1370 return nfserr_bad_xdr; 1371 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len); 1372 if (!p) 1373 return nfserr_bad_xdr; 1374 setclientid->se_callback_netid_val = svcxdr_savemem(argp, p, 1375 setclientid->se_callback_netid_len); 1376 if (!setclientid->se_callback_netid_val) 1377 return nfserr_jukebox; 1378 1379 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0) 1380 return nfserr_bad_xdr; 1381 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len); 1382 if (!p) 1383 return nfserr_bad_xdr; 1384 setclientid->se_callback_addr_val = svcxdr_savemem(argp, p, 1385 setclientid->se_callback_addr_len); 1386 if (!setclientid->se_callback_addr_val) 1387 return nfserr_jukebox; 1388 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0) 1389 return nfserr_bad_xdr; 1390 1391 return nfs_ok; 1392 } 1393 1394 static __be32 1395 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, 1396 union nfsd4_op_u *u) 1397 { 1398 struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm; 1399 __be32 status; 1400 1401 if (argp->minorversion >= 1) 1402 return nfserr_notsupp; 1403 1404 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid); 1405 if (status) 1406 return status; 1407 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm); 1408 } 1409 1410 /* Also used for NVERIFY */ 1411 static __be32 1412 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1413 { 1414 struct nfsd4_verify *verify = &u->verify; 1415 __be32 *p, status; 1416 1417 memset(verify, 0, sizeof(*verify)); 1418 1419 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval, 1420 ARRAY_SIZE(verify->ve_bmval)); 1421 if (status) 1422 return status; 1423 1424 /* For convenience's sake, we compare raw xdr'd attributes in 1425 * nfsd4_proc_verify */ 1426 1427 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0) 1428 return nfserr_bad_xdr; 1429 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen); 1430 if (!p) 1431 return nfserr_bad_xdr; 1432 verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen); 1433 if (!verify->ve_attrval) 1434 return nfserr_jukebox; 1435 1436 return nfs_ok; 1437 } 1438 1439 static __be32 1440 nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1441 { 1442 struct nfsd4_write *write = &u->write; 1443 __be32 status; 1444 1445 status = nfsd4_decode_stateid4(argp, &write->wr_stateid); 1446 if (status) 1447 return status; 1448 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0) 1449 return nfserr_bad_xdr; 1450 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0) 1451 return nfserr_bad_xdr; 1452 if (write->wr_stable_how > NFS_FILE_SYNC) 1453 return nfserr_bad_xdr; 1454 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0) 1455 return nfserr_bad_xdr; 1456 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen)) 1457 return nfserr_bad_xdr; 1458 1459 write->wr_bytes_written = 0; 1460 write->wr_how_written = 0; 1461 memset(&write->wr_verifier, 0, sizeof(write->wr_verifier)); 1462 return nfs_ok; 1463 } 1464 1465 static __be32 1466 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, 1467 union nfsd4_op_u *u) 1468 { 1469 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner; 1470 __be32 status; 1471 1472 if (argp->minorversion >= 1) 1473 return nfserr_notsupp; 1474 1475 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid, 1476 &rlockowner->rl_owner); 1477 if (status) 1478 return status; 1479 1480 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid)) 1481 return nfserr_inval; 1482 1483 return nfs_ok; 1484 } 1485 1486 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, 1487 union nfsd4_op_u *u) 1488 { 1489 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl; 1490 memset(bc, 0, sizeof(*bc)); 1491 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0) 1492 return nfserr_bad_xdr; 1493 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec); 1494 } 1495 1496 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, 1497 union nfsd4_op_u *u) 1498 { 1499 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session; 1500 u32 use_conn_in_rdma_mode; 1501 __be32 status; 1502 1503 memset(bcts, 0, sizeof(*bcts)); 1504 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid); 1505 if (status) 1506 return status; 1507 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0) 1508 return nfserr_bad_xdr; 1509 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0) 1510 return nfserr_bad_xdr; 1511 1512 return nfs_ok; 1513 } 1514 1515 static __be32 1516 nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp, 1517 struct nfsd4_exchange_id *exid) 1518 { 1519 __be32 status; 1520 1521 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce, 1522 ARRAY_SIZE(exid->spo_must_enforce)); 1523 if (status) 1524 return nfserr_bad_xdr; 1525 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow, 1526 ARRAY_SIZE(exid->spo_must_allow)); 1527 if (status) 1528 return nfserr_bad_xdr; 1529 1530 return nfs_ok; 1531 } 1532 1533 /* 1534 * This implementation currently does not support SP4_SSV. 1535 * This decoder simply skips over these arguments. 1536 */ 1537 static noinline __be32 1538 nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp, 1539 struct nfsd4_exchange_id *exid) 1540 { 1541 u32 count, window, num_gss_handles; 1542 __be32 status; 1543 1544 /* ssp_ops */ 1545 status = nfsd4_decode_state_protect_ops(argp, exid); 1546 if (status) 1547 return status; 1548 1549 /* ssp_hash_algs<> */ 1550 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1551 return nfserr_bad_xdr; 1552 while (count--) { 1553 status = nfsd4_decode_ignored_string(argp, 0); 1554 if (status) 1555 return status; 1556 } 1557 1558 /* ssp_encr_algs<> */ 1559 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1560 return nfserr_bad_xdr; 1561 while (count--) { 1562 status = nfsd4_decode_ignored_string(argp, 0); 1563 if (status) 1564 return status; 1565 } 1566 1567 if (xdr_stream_decode_u32(argp->xdr, &window) < 0) 1568 return nfserr_bad_xdr; 1569 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0) 1570 return nfserr_bad_xdr; 1571 1572 return nfs_ok; 1573 } 1574 1575 static __be32 1576 nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp, 1577 struct nfsd4_exchange_id *exid) 1578 { 1579 __be32 status; 1580 1581 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0) 1582 return nfserr_bad_xdr; 1583 switch (exid->spa_how) { 1584 case SP4_NONE: 1585 break; 1586 case SP4_MACH_CRED: 1587 status = nfsd4_decode_state_protect_ops(argp, exid); 1588 if (status) 1589 return status; 1590 break; 1591 case SP4_SSV: 1592 status = nfsd4_decode_ssv_sp_parms(argp, exid); 1593 if (status) 1594 return status; 1595 break; 1596 default: 1597 return nfserr_bad_xdr; 1598 } 1599 1600 return nfs_ok; 1601 } 1602 1603 static __be32 1604 nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp, 1605 struct nfsd4_exchange_id *exid) 1606 { 1607 __be32 status; 1608 u32 count; 1609 1610 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1611 return nfserr_bad_xdr; 1612 switch (count) { 1613 case 0: 1614 break; 1615 case 1: 1616 /* Note that RFC 8881 places no length limit on 1617 * nii_domain, but this implementation permits no 1618 * more than NFS4_OPAQUE_LIMIT bytes */ 1619 status = nfsd4_decode_opaque(argp, &exid->nii_domain); 1620 if (status) 1621 return status; 1622 /* Note that RFC 8881 places no length limit on 1623 * nii_name, but this implementation permits no 1624 * more than NFS4_OPAQUE_LIMIT bytes */ 1625 status = nfsd4_decode_opaque(argp, &exid->nii_name); 1626 if (status) 1627 return status; 1628 status = nfsd4_decode_nfstime4(argp, &exid->nii_time); 1629 if (status) 1630 return status; 1631 break; 1632 default: 1633 return nfserr_bad_xdr; 1634 } 1635 1636 return nfs_ok; 1637 } 1638 1639 static __be32 1640 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp, 1641 union nfsd4_op_u *u) 1642 { 1643 struct nfsd4_exchange_id *exid = &u->exchange_id; 1644 __be32 status; 1645 1646 memset(exid, 0, sizeof(*exid)); 1647 status = nfsd4_decode_verifier4(argp, &exid->verifier); 1648 if (status) 1649 return status; 1650 status = nfsd4_decode_opaque(argp, &exid->clname); 1651 if (status) 1652 return status; 1653 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0) 1654 return nfserr_bad_xdr; 1655 status = nfsd4_decode_state_protect4_a(argp, exid); 1656 if (status) 1657 return status; 1658 return nfsd4_decode_nfs_impl_id4(argp, exid); 1659 } 1660 1661 static __be32 1662 nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp, 1663 struct nfsd4_channel_attrs *ca) 1664 { 1665 __be32 *p; 1666 1667 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7); 1668 if (!p) 1669 return nfserr_bad_xdr; 1670 1671 /* headerpadsz is ignored */ 1672 p++; 1673 ca->maxreq_sz = be32_to_cpup(p++); 1674 ca->maxresp_sz = be32_to_cpup(p++); 1675 ca->maxresp_cached = be32_to_cpup(p++); 1676 ca->maxops = be32_to_cpup(p++); 1677 ca->maxreqs = be32_to_cpup(p++); 1678 ca->nr_rdma_attrs = be32_to_cpup(p); 1679 switch (ca->nr_rdma_attrs) { 1680 case 0: 1681 break; 1682 case 1: 1683 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0) 1684 return nfserr_bad_xdr; 1685 break; 1686 default: 1687 return nfserr_bad_xdr; 1688 } 1689 1690 return nfs_ok; 1691 } 1692 1693 static __be32 1694 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, 1695 union nfsd4_op_u *u) 1696 { 1697 struct nfsd4_create_session *sess = &u->create_session; 1698 __be32 status; 1699 1700 memset(sess, 0, sizeof(*sess)); 1701 status = nfsd4_decode_clientid4(argp, &sess->clientid); 1702 if (status) 1703 return status; 1704 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0) 1705 return nfserr_bad_xdr; 1706 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0) 1707 return nfserr_bad_xdr; 1708 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel); 1709 if (status) 1710 return status; 1711 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel); 1712 if (status) 1713 return status; 1714 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0) 1715 return nfserr_bad_xdr; 1716 return nfsd4_decode_cb_sec(argp, &sess->cb_sec); 1717 } 1718 1719 static __be32 1720 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp, 1721 union nfsd4_op_u *u) 1722 { 1723 struct nfsd4_destroy_session *destroy_session = &u->destroy_session; 1724 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid); 1725 } 1726 1727 static __be32 1728 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp, 1729 union nfsd4_op_u *u) 1730 { 1731 struct nfsd4_free_stateid *free_stateid = &u->free_stateid; 1732 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid); 1733 } 1734 1735 #ifdef CONFIG_NFSD_PNFS 1736 static __be32 1737 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp, 1738 union nfsd4_op_u *u) 1739 { 1740 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo; 1741 __be32 status; 1742 1743 memset(gdev, 0, sizeof(*gdev)); 1744 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid); 1745 if (status) 1746 return status; 1747 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0) 1748 return nfserr_bad_xdr; 1749 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0) 1750 return nfserr_bad_xdr; 1751 if (xdr_stream_decode_uint32_array(argp->xdr, 1752 &gdev->gd_notify_types, 1) < 0) 1753 return nfserr_bad_xdr; 1754 1755 return nfs_ok; 1756 } 1757 1758 static __be32 1759 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp, 1760 union nfsd4_op_u *u) 1761 { 1762 struct nfsd4_layoutcommit *lcp = &u->layoutcommit; 1763 __be32 *p, status; 1764 1765 memset(lcp, 0, sizeof(*lcp)); 1766 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0) 1767 return nfserr_bad_xdr; 1768 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0) 1769 return nfserr_bad_xdr; 1770 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0) 1771 return nfserr_bad_xdr; 1772 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid); 1773 if (status) 1774 return status; 1775 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0) 1776 return nfserr_bad_xdr; 1777 if (lcp->lc_newoffset) { 1778 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0) 1779 return nfserr_bad_xdr; 1780 } else 1781 lcp->lc_last_wr = 0; 1782 p = xdr_inline_decode(argp->xdr, XDR_UNIT); 1783 if (!p) 1784 return nfserr_bad_xdr; 1785 if (xdr_item_is_present(p)) { 1786 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime); 1787 if (status) 1788 return status; 1789 } else { 1790 lcp->lc_mtime.tv_nsec = UTIME_NOW; 1791 } 1792 return nfsd4_decode_layoutupdate4(argp, lcp); 1793 } 1794 1795 static __be32 1796 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp, 1797 union nfsd4_op_u *u) 1798 { 1799 struct nfsd4_layoutget *lgp = &u->layoutget; 1800 __be32 status; 1801 1802 memset(lgp, 0, sizeof(*lgp)); 1803 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0) 1804 return nfserr_bad_xdr; 1805 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0) 1806 return nfserr_bad_xdr; 1807 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0) 1808 return nfserr_bad_xdr; 1809 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0) 1810 return nfserr_bad_xdr; 1811 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0) 1812 return nfserr_bad_xdr; 1813 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0) 1814 return nfserr_bad_xdr; 1815 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid); 1816 if (status) 1817 return status; 1818 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0) 1819 return nfserr_bad_xdr; 1820 1821 return nfs_ok; 1822 } 1823 1824 static __be32 1825 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp, 1826 union nfsd4_op_u *u) 1827 { 1828 struct nfsd4_layoutreturn *lrp = &u->layoutreturn; 1829 memset(lrp, 0, sizeof(*lrp)); 1830 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0) 1831 return nfserr_bad_xdr; 1832 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0) 1833 return nfserr_bad_xdr; 1834 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0) 1835 return nfserr_bad_xdr; 1836 return nfsd4_decode_layoutreturn4(argp, lrp); 1837 } 1838 #endif /* CONFIG_NFSD_PNFS */ 1839 1840 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp, 1841 union nfsd4_op_u *u) 1842 { 1843 struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name; 1844 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0) 1845 return nfserr_bad_xdr; 1846 1847 sin->sin_exp = NULL; 1848 return nfs_ok; 1849 } 1850 1851 static __be32 1852 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp, 1853 union nfsd4_op_u *u) 1854 { 1855 struct nfsd4_sequence *seq = &u->sequence; 1856 __be32 *p, status; 1857 1858 status = nfsd4_decode_sessionid4(argp, &seq->sessionid); 1859 if (status) 1860 return status; 1861 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4); 1862 if (!p) 1863 return nfserr_bad_xdr; 1864 seq->seqid = be32_to_cpup(p++); 1865 seq->slotid = be32_to_cpup(p++); 1866 seq->maxslots = be32_to_cpup(p++); 1867 seq->cachethis = be32_to_cpup(p); 1868 1869 seq->status_flags = 0; 1870 return nfs_ok; 1871 } 1872 1873 static __be32 1874 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, 1875 union nfsd4_op_u *u) 1876 { 1877 struct nfsd4_test_stateid *test_stateid = &u->test_stateid; 1878 struct nfsd4_test_stateid_id *stateid; 1879 __be32 status; 1880 u32 i; 1881 1882 memset(test_stateid, 0, sizeof(*test_stateid)); 1883 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0) 1884 return nfserr_bad_xdr; 1885 1886 INIT_LIST_HEAD(&test_stateid->ts_stateid_list); 1887 for (i = 0; i < test_stateid->ts_num_ids; i++) { 1888 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); 1889 if (!stateid) 1890 return nfserr_jukebox; 1891 INIT_LIST_HEAD(&stateid->ts_id_list); 1892 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); 1893 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid); 1894 if (status) 1895 return status; 1896 } 1897 1898 return nfs_ok; 1899 } 1900 1901 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, 1902 union nfsd4_op_u *u) 1903 { 1904 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid; 1905 return nfsd4_decode_clientid4(argp, &dc->clientid); 1906 } 1907 1908 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, 1909 union nfsd4_op_u *u) 1910 { 1911 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete; 1912 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0) 1913 return nfserr_bad_xdr; 1914 return nfs_ok; 1915 } 1916 1917 static __be32 1918 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp, 1919 union nfsd4_op_u *u) 1920 { 1921 struct nfsd4_fallocate *fallocate = &u->allocate; 1922 __be32 status; 1923 1924 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid); 1925 if (status) 1926 return status; 1927 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0) 1928 return nfserr_bad_xdr; 1929 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0) 1930 return nfserr_bad_xdr; 1931 1932 return nfs_ok; 1933 } 1934 1935 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp, 1936 struct nl4_server *ns) 1937 { 1938 struct nfs42_netaddr *naddr; 1939 __be32 *p; 1940 1941 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0) 1942 return nfserr_bad_xdr; 1943 1944 /* currently support for 1 inter-server source server */ 1945 switch (ns->nl4_type) { 1946 case NL4_NETADDR: 1947 naddr = &ns->u.nl4_addr; 1948 1949 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0) 1950 return nfserr_bad_xdr; 1951 if (naddr->netid_len > RPCBIND_MAXNETIDLEN) 1952 return nfserr_bad_xdr; 1953 1954 p = xdr_inline_decode(argp->xdr, naddr->netid_len); 1955 if (!p) 1956 return nfserr_bad_xdr; 1957 memcpy(naddr->netid, p, naddr->netid_len); 1958 1959 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0) 1960 return nfserr_bad_xdr; 1961 if (naddr->addr_len > RPCBIND_MAXUADDRLEN) 1962 return nfserr_bad_xdr; 1963 1964 p = xdr_inline_decode(argp->xdr, naddr->addr_len); 1965 if (!p) 1966 return nfserr_bad_xdr; 1967 memcpy(naddr->addr, p, naddr->addr_len); 1968 break; 1969 default: 1970 return nfserr_bad_xdr; 1971 } 1972 1973 return nfs_ok; 1974 } 1975 1976 static __be32 1977 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 1978 { 1979 struct nfsd4_copy *copy = &u->copy; 1980 u32 consecutive, i, count, sync; 1981 struct nl4_server *ns_dummy; 1982 __be32 status; 1983 1984 memset(copy, 0, sizeof(*copy)); 1985 status = nfsd4_decode_stateid4(argp, ©->cp_src_stateid); 1986 if (status) 1987 return status; 1988 status = nfsd4_decode_stateid4(argp, ©->cp_dst_stateid); 1989 if (status) 1990 return status; 1991 if (xdr_stream_decode_u64(argp->xdr, ©->cp_src_pos) < 0) 1992 return nfserr_bad_xdr; 1993 if (xdr_stream_decode_u64(argp->xdr, ©->cp_dst_pos) < 0) 1994 return nfserr_bad_xdr; 1995 if (xdr_stream_decode_u64(argp->xdr, ©->cp_count) < 0) 1996 return nfserr_bad_xdr; 1997 /* ca_consecutive: we always do consecutive copies */ 1998 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0) 1999 return nfserr_bad_xdr; 2000 if (xdr_stream_decode_bool(argp->xdr, &sync) < 0) 2001 return nfserr_bad_xdr; 2002 nfsd4_copy_set_sync(copy, sync); 2003 2004 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 2005 return nfserr_bad_xdr; 2006 copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src)); 2007 if (copy->cp_src == NULL) 2008 return nfserr_jukebox; 2009 if (count == 0) { /* intra-server copy */ 2010 __set_bit(NFSD4_COPY_F_INTRA, ©->cp_flags); 2011 return nfs_ok; 2012 } 2013 2014 /* decode all the supplied server addresses but use only the first */ 2015 status = nfsd4_decode_nl4_server(argp, copy->cp_src); 2016 if (status) 2017 return status; 2018 2019 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL); 2020 if (ns_dummy == NULL) 2021 return nfserr_jukebox; 2022 for (i = 0; i < count - 1; i++) { 2023 status = nfsd4_decode_nl4_server(argp, ns_dummy); 2024 if (status) { 2025 kfree(ns_dummy); 2026 return status; 2027 } 2028 } 2029 kfree(ns_dummy); 2030 2031 return nfs_ok; 2032 } 2033 2034 static __be32 2035 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp, 2036 union nfsd4_op_u *u) 2037 { 2038 struct nfsd4_copy_notify *cn = &u->copy_notify; 2039 __be32 status; 2040 2041 memset(cn, 0, sizeof(*cn)); 2042 cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src)); 2043 if (cn->cpn_src == NULL) 2044 return nfserr_jukebox; 2045 cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst)); 2046 if (cn->cpn_dst == NULL) 2047 return nfserr_jukebox; 2048 2049 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid); 2050 if (status) 2051 return status; 2052 return nfsd4_decode_nl4_server(argp, cn->cpn_dst); 2053 } 2054 2055 static __be32 2056 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp, 2057 union nfsd4_op_u *u) 2058 { 2059 struct nfsd4_offload_status *os = &u->offload_status; 2060 os->count = 0; 2061 os->status = 0; 2062 return nfsd4_decode_stateid4(argp, &os->stateid); 2063 } 2064 2065 static __be32 2066 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 2067 { 2068 struct nfsd4_seek *seek = &u->seek; 2069 __be32 status; 2070 2071 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid); 2072 if (status) 2073 return status; 2074 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0) 2075 return nfserr_bad_xdr; 2076 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0) 2077 return nfserr_bad_xdr; 2078 2079 seek->seek_eof = 0; 2080 seek->seek_pos = 0; 2081 return nfs_ok; 2082 } 2083 2084 static __be32 2085 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u) 2086 { 2087 struct nfsd4_clone *clone = &u->clone; 2088 __be32 status; 2089 2090 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid); 2091 if (status) 2092 return status; 2093 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid); 2094 if (status) 2095 return status; 2096 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0) 2097 return nfserr_bad_xdr; 2098 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0) 2099 return nfserr_bad_xdr; 2100 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0) 2101 return nfserr_bad_xdr; 2102 2103 return nfs_ok; 2104 } 2105 2106 /* 2107 * XDR data that is more than PAGE_SIZE in size is normally part of a 2108 * read or write. However, the size of extended attributes is limited 2109 * by the maximum request size, and then further limited by the underlying 2110 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX 2111 * is 64k). Since there is no kvec- or page-based interface to xattrs, 2112 * and we're not dealing with contiguous pages, we need to do some copying. 2113 */ 2114 2115 /* 2116 * Decode data into buffer. 2117 */ 2118 static __be32 2119 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr, 2120 char **bufp, u32 buflen) 2121 { 2122 struct page **pages = xdr->pages; 2123 struct kvec *head = xdr->head; 2124 char *tmp, *dp; 2125 u32 len; 2126 2127 if (buflen <= head->iov_len) { 2128 /* 2129 * We're in luck, the head has enough space. Just return 2130 * the head, no need for copying. 2131 */ 2132 *bufp = head->iov_base; 2133 return 0; 2134 } 2135 2136 tmp = svcxdr_tmpalloc(argp, buflen); 2137 if (tmp == NULL) 2138 return nfserr_jukebox; 2139 2140 dp = tmp; 2141 memcpy(dp, head->iov_base, head->iov_len); 2142 buflen -= head->iov_len; 2143 dp += head->iov_len; 2144 2145 while (buflen > 0) { 2146 len = min_t(u32, buflen, PAGE_SIZE); 2147 memcpy(dp, page_address(*pages), len); 2148 2149 buflen -= len; 2150 dp += len; 2151 pages++; 2152 } 2153 2154 *bufp = tmp; 2155 return 0; 2156 } 2157 2158 /* 2159 * Get a user extended attribute name from the XDR buffer. 2160 * It will not have the "user." prefix, so prepend it. 2161 * Lastly, check for nul characters in the name. 2162 */ 2163 static __be32 2164 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep) 2165 { 2166 char *name, *sp, *dp; 2167 u32 namelen, cnt; 2168 __be32 *p; 2169 2170 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0) 2171 return nfserr_bad_xdr; 2172 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN)) 2173 return nfserr_nametoolong; 2174 if (namelen == 0) 2175 return nfserr_bad_xdr; 2176 p = xdr_inline_decode(argp->xdr, namelen); 2177 if (!p) 2178 return nfserr_bad_xdr; 2179 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1); 2180 if (!name) 2181 return nfserr_jukebox; 2182 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); 2183 2184 /* 2185 * Copy the extended attribute name over while checking for 0 2186 * characters. 2187 */ 2188 sp = (char *)p; 2189 dp = name + XATTR_USER_PREFIX_LEN; 2190 cnt = namelen; 2191 2192 while (cnt-- > 0) { 2193 if (*sp == '\0') 2194 return nfserr_bad_xdr; 2195 *dp++ = *sp++; 2196 } 2197 *dp = '\0'; 2198 2199 *namep = name; 2200 2201 return nfs_ok; 2202 } 2203 2204 /* 2205 * A GETXATTR op request comes without a length specifier. We just set the 2206 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum 2207 * channel reply size. nfsd_getxattr will probe the length of the xattr, 2208 * check it against getxa_len, and allocate + return the value. 2209 */ 2210 static __be32 2211 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp, 2212 union nfsd4_op_u *u) 2213 { 2214 struct nfsd4_getxattr *getxattr = &u->getxattr; 2215 __be32 status; 2216 u32 maxcount; 2217 2218 memset(getxattr, 0, sizeof(*getxattr)); 2219 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name); 2220 if (status) 2221 return status; 2222 2223 maxcount = svc_max_payload(argp->rqstp); 2224 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2225 2226 getxattr->getxa_len = maxcount; 2227 return nfs_ok; 2228 } 2229 2230 static __be32 2231 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp, 2232 union nfsd4_op_u *u) 2233 { 2234 struct nfsd4_setxattr *setxattr = &u->setxattr; 2235 u32 flags, maxcount, size; 2236 __be32 status; 2237 2238 memset(setxattr, 0, sizeof(*setxattr)); 2239 2240 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0) 2241 return nfserr_bad_xdr; 2242 2243 if (flags > SETXATTR4_REPLACE) 2244 return nfserr_inval; 2245 setxattr->setxa_flags = flags; 2246 2247 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name); 2248 if (status) 2249 return status; 2250 2251 maxcount = svc_max_payload(argp->rqstp); 2252 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2253 2254 if (xdr_stream_decode_u32(argp->xdr, &size) < 0) 2255 return nfserr_bad_xdr; 2256 if (size > maxcount) 2257 return nfserr_xattr2big; 2258 2259 setxattr->setxa_len = size; 2260 if (size > 0) { 2261 struct xdr_buf payload; 2262 2263 if (!xdr_stream_subsegment(argp->xdr, &payload, size)) 2264 return nfserr_bad_xdr; 2265 status = nfsd4_vbuf_from_vector(argp, &payload, 2266 &setxattr->setxa_buf, size); 2267 } 2268 2269 return nfs_ok; 2270 } 2271 2272 static __be32 2273 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp, 2274 union nfsd4_op_u *u) 2275 { 2276 struct nfsd4_listxattrs *listxattrs = &u->listxattrs; 2277 u32 maxcount; 2278 2279 memset(listxattrs, 0, sizeof(*listxattrs)); 2280 2281 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0) 2282 return nfserr_bad_xdr; 2283 2284 /* 2285 * If the cookie is too large to have even one user.x attribute 2286 * plus trailing '\0' left in a maximum size buffer, it's invalid. 2287 */ 2288 if (listxattrs->lsxa_cookie >= 2289 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2))) 2290 return nfserr_badcookie; 2291 2292 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0) 2293 return nfserr_bad_xdr; 2294 if (maxcount < 8) 2295 /* Always need at least 2 words (length and one character) */ 2296 return nfserr_inval; 2297 2298 maxcount = min(maxcount, svc_max_payload(argp->rqstp)); 2299 listxattrs->lsxa_maxcount = maxcount; 2300 2301 return nfs_ok; 2302 } 2303 2304 static __be32 2305 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp, 2306 union nfsd4_op_u *u) 2307 { 2308 struct nfsd4_removexattr *removexattr = &u->removexattr; 2309 memset(removexattr, 0, sizeof(*removexattr)); 2310 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name); 2311 } 2312 2313 static __be32 2314 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p) 2315 { 2316 return nfs_ok; 2317 } 2318 2319 static __be32 2320 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p) 2321 { 2322 return nfserr_notsupp; 2323 } 2324 2325 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u); 2326 2327 static const nfsd4_dec nfsd4_dec_ops[] = { 2328 [OP_ACCESS] = nfsd4_decode_access, 2329 [OP_CLOSE] = nfsd4_decode_close, 2330 [OP_COMMIT] = nfsd4_decode_commit, 2331 [OP_CREATE] = nfsd4_decode_create, 2332 [OP_DELEGPURGE] = nfsd4_decode_notsupp, 2333 [OP_DELEGRETURN] = nfsd4_decode_delegreturn, 2334 [OP_GETATTR] = nfsd4_decode_getattr, 2335 [OP_GETFH] = nfsd4_decode_noop, 2336 [OP_LINK] = nfsd4_decode_link, 2337 [OP_LOCK] = nfsd4_decode_lock, 2338 [OP_LOCKT] = nfsd4_decode_lockt, 2339 [OP_LOCKU] = nfsd4_decode_locku, 2340 [OP_LOOKUP] = nfsd4_decode_lookup, 2341 [OP_LOOKUPP] = nfsd4_decode_noop, 2342 [OP_NVERIFY] = nfsd4_decode_verify, 2343 [OP_OPEN] = nfsd4_decode_open, 2344 [OP_OPENATTR] = nfsd4_decode_notsupp, 2345 [OP_OPEN_CONFIRM] = nfsd4_decode_open_confirm, 2346 [OP_OPEN_DOWNGRADE] = nfsd4_decode_open_downgrade, 2347 [OP_PUTFH] = nfsd4_decode_putfh, 2348 [OP_PUTPUBFH] = nfsd4_decode_putpubfh, 2349 [OP_PUTROOTFH] = nfsd4_decode_noop, 2350 [OP_READ] = nfsd4_decode_read, 2351 [OP_READDIR] = nfsd4_decode_readdir, 2352 [OP_READLINK] = nfsd4_decode_noop, 2353 [OP_REMOVE] = nfsd4_decode_remove, 2354 [OP_RENAME] = nfsd4_decode_rename, 2355 [OP_RENEW] = nfsd4_decode_renew, 2356 [OP_RESTOREFH] = nfsd4_decode_noop, 2357 [OP_SAVEFH] = nfsd4_decode_noop, 2358 [OP_SECINFO] = nfsd4_decode_secinfo, 2359 [OP_SETATTR] = nfsd4_decode_setattr, 2360 [OP_SETCLIENTID] = nfsd4_decode_setclientid, 2361 [OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm, 2362 [OP_VERIFY] = nfsd4_decode_verify, 2363 [OP_WRITE] = nfsd4_decode_write, 2364 [OP_RELEASE_LOCKOWNER] = nfsd4_decode_release_lockowner, 2365 2366 /* new operations for NFSv4.1 */ 2367 [OP_BACKCHANNEL_CTL] = nfsd4_decode_backchannel_ctl, 2368 [OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session, 2369 [OP_EXCHANGE_ID] = nfsd4_decode_exchange_id, 2370 [OP_CREATE_SESSION] = nfsd4_decode_create_session, 2371 [OP_DESTROY_SESSION] = nfsd4_decode_destroy_session, 2372 [OP_FREE_STATEID] = nfsd4_decode_free_stateid, 2373 [OP_GET_DIR_DELEGATION] = nfsd4_decode_notsupp, 2374 #ifdef CONFIG_NFSD_PNFS 2375 [OP_GETDEVICEINFO] = nfsd4_decode_getdeviceinfo, 2376 [OP_GETDEVICELIST] = nfsd4_decode_notsupp, 2377 [OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit, 2378 [OP_LAYOUTGET] = nfsd4_decode_layoutget, 2379 [OP_LAYOUTRETURN] = nfsd4_decode_layoutreturn, 2380 #else 2381 [OP_GETDEVICEINFO] = nfsd4_decode_notsupp, 2382 [OP_GETDEVICELIST] = nfsd4_decode_notsupp, 2383 [OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp, 2384 [OP_LAYOUTGET] = nfsd4_decode_notsupp, 2385 [OP_LAYOUTRETURN] = nfsd4_decode_notsupp, 2386 #endif 2387 [OP_SECINFO_NO_NAME] = nfsd4_decode_secinfo_no_name, 2388 [OP_SEQUENCE] = nfsd4_decode_sequence, 2389 [OP_SET_SSV] = nfsd4_decode_notsupp, 2390 [OP_TEST_STATEID] = nfsd4_decode_test_stateid, 2391 [OP_WANT_DELEGATION] = nfsd4_decode_notsupp, 2392 [OP_DESTROY_CLIENTID] = nfsd4_decode_destroy_clientid, 2393 [OP_RECLAIM_COMPLETE] = nfsd4_decode_reclaim_complete, 2394 2395 /* new operations for NFSv4.2 */ 2396 [OP_ALLOCATE] = nfsd4_decode_fallocate, 2397 [OP_COPY] = nfsd4_decode_copy, 2398 [OP_COPY_NOTIFY] = nfsd4_decode_copy_notify, 2399 [OP_DEALLOCATE] = nfsd4_decode_fallocate, 2400 [OP_IO_ADVISE] = nfsd4_decode_notsupp, 2401 [OP_LAYOUTERROR] = nfsd4_decode_notsupp, 2402 [OP_LAYOUTSTATS] = nfsd4_decode_notsupp, 2403 [OP_OFFLOAD_CANCEL] = nfsd4_decode_offload_status, 2404 [OP_OFFLOAD_STATUS] = nfsd4_decode_offload_status, 2405 [OP_READ_PLUS] = nfsd4_decode_read, 2406 [OP_SEEK] = nfsd4_decode_seek, 2407 [OP_WRITE_SAME] = nfsd4_decode_notsupp, 2408 [OP_CLONE] = nfsd4_decode_clone, 2409 /* RFC 8276 extended atributes operations */ 2410 [OP_GETXATTR] = nfsd4_decode_getxattr, 2411 [OP_SETXATTR] = nfsd4_decode_setxattr, 2412 [OP_LISTXATTRS] = nfsd4_decode_listxattrs, 2413 [OP_REMOVEXATTR] = nfsd4_decode_removexattr, 2414 }; 2415 2416 static inline bool 2417 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op) 2418 { 2419 if (op->opnum < FIRST_NFS4_OP) 2420 return false; 2421 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP) 2422 return false; 2423 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP) 2424 return false; 2425 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP) 2426 return false; 2427 return true; 2428 } 2429 2430 static bool 2431 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 2432 { 2433 struct nfsd4_op *op; 2434 bool cachethis = false; 2435 int auth_slack= argp->rqstp->rq_auth_slack; 2436 int max_reply = auth_slack + 8; /* opcnt, status */ 2437 int readcount = 0; 2438 int readbytes = 0; 2439 __be32 *p; 2440 int i; 2441 2442 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0) 2443 return false; 2444 max_reply += XDR_UNIT; 2445 argp->tag = NULL; 2446 if (unlikely(argp->taglen)) { 2447 if (argp->taglen > NFSD4_MAX_TAGLEN) 2448 return false; 2449 p = xdr_inline_decode(argp->xdr, argp->taglen); 2450 if (!p) 2451 return false; 2452 argp->tag = svcxdr_savemem(argp, p, argp->taglen); 2453 if (!argp->tag) 2454 return false; 2455 max_reply += xdr_align_size(argp->taglen); 2456 } 2457 2458 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0) 2459 return false; 2460 if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0) 2461 return false; 2462 argp->opcnt = min_t(u32, argp->client_opcnt, 2463 NFSD_MAX_OPS_PER_COMPOUND); 2464 2465 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { 2466 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops)); 2467 if (!argp->ops) { 2468 argp->ops = argp->iops; 2469 return false; 2470 } 2471 } 2472 2473 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 2474 argp->opcnt = 0; 2475 2476 for (i = 0; i < argp->opcnt; i++) { 2477 op = &argp->ops[i]; 2478 op->replay = NULL; 2479 2480 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0) 2481 return false; 2482 if (nfsd4_opnum_in_range(argp, op)) { 2483 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u); 2484 if (op->status != nfs_ok) 2485 trace_nfsd_compound_decode_err(argp->rqstp, 2486 argp->opcnt, i, 2487 op->opnum, 2488 op->status); 2489 } else { 2490 op->opnum = OP_ILLEGAL; 2491 op->status = nfserr_op_illegal; 2492 } 2493 op->opdesc = OPDESC(op); 2494 /* 2495 * We'll try to cache the result in the DRC if any one 2496 * op in the compound wants to be cached: 2497 */ 2498 cachethis |= nfsd4_cache_this_op(op); 2499 2500 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) { 2501 readcount++; 2502 readbytes += nfsd4_max_reply(argp->rqstp, op); 2503 } else 2504 max_reply += nfsd4_max_reply(argp->rqstp, op); 2505 /* 2506 * OP_LOCK and OP_LOCKT may return a conflicting lock. 2507 * (Special case because it will just skip encoding this 2508 * if it runs out of xdr buffer space, and it is the only 2509 * operation that behaves this way.) 2510 */ 2511 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT) 2512 max_reply += NFS4_OPAQUE_LIMIT; 2513 2514 if (op->status) { 2515 argp->opcnt = i+1; 2516 break; 2517 } 2518 } 2519 /* Sessions make the DRC unnecessary: */ 2520 if (argp->minorversion) 2521 cachethis = false; 2522 svc_reserve(argp->rqstp, max_reply + readbytes); 2523 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE; 2524 2525 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack) 2526 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags); 2527 2528 return true; 2529 } 2530 2531 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode, 2532 struct svc_export *exp) 2533 { 2534 if (exp->ex_flags & NFSEXP_V4ROOT) { 2535 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time)); 2536 *p++ = 0; 2537 } else 2538 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode)); 2539 return p; 2540 } 2541 2542 /* 2543 * ctime (in NFSv4, time_metadata) is not writeable, and the client 2544 * doesn't really care what resolution could theoretically be stored by 2545 * the filesystem. 2546 * 2547 * The client cares how close together changes can be while still 2548 * guaranteeing ctime changes. For most filesystems (which have 2549 * timestamps with nanosecond fields) that is limited by the resolution 2550 * of the time returned from current_time() (which I'm assuming to be 2551 * 1/HZ). 2552 */ 2553 static __be32 *encode_time_delta(__be32 *p, struct inode *inode) 2554 { 2555 struct timespec64 ts; 2556 u32 ns; 2557 2558 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran); 2559 ts = ns_to_timespec64(ns); 2560 2561 p = xdr_encode_hyper(p, ts.tv_sec); 2562 *p++ = cpu_to_be32(ts.tv_nsec); 2563 2564 return p; 2565 } 2566 2567 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c) 2568 { 2569 *p++ = cpu_to_be32(c->atomic); 2570 p = xdr_encode_hyper(p, c->before_change); 2571 p = xdr_encode_hyper(p, c->after_change); 2572 return p; 2573 } 2574 2575 /* Encode as an array of strings the string given with components 2576 * separated @sep, escaped with esc_enter and esc_exit. 2577 */ 2578 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep, 2579 char *components, char esc_enter, 2580 char esc_exit) 2581 { 2582 __be32 *p; 2583 __be32 pathlen; 2584 int pathlen_offset; 2585 int strlen, count=0; 2586 char *str, *end, *next; 2587 2588 dprintk("nfsd4_encode_components(%s)\n", components); 2589 2590 pathlen_offset = xdr->buf->len; 2591 p = xdr_reserve_space(xdr, 4); 2592 if (!p) 2593 return nfserr_resource; 2594 p++; /* We will fill this in with @count later */ 2595 2596 end = str = components; 2597 while (*end) { 2598 bool found_esc = false; 2599 2600 /* try to parse as esc_start, ..., esc_end, sep */ 2601 if (*str == esc_enter) { 2602 for (; *end && (*end != esc_exit); end++) 2603 /* find esc_exit or end of string */; 2604 next = end + 1; 2605 if (*end && (!*next || *next == sep)) { 2606 str++; 2607 found_esc = true; 2608 } 2609 } 2610 2611 if (!found_esc) 2612 for (; *end && (*end != sep); end++) 2613 /* find sep or end of string */; 2614 2615 strlen = end - str; 2616 if (strlen) { 2617 p = xdr_reserve_space(xdr, strlen + 4); 2618 if (!p) 2619 return nfserr_resource; 2620 p = xdr_encode_opaque(p, str, strlen); 2621 count++; 2622 } 2623 else 2624 end++; 2625 if (found_esc) 2626 end = next; 2627 2628 str = end; 2629 } 2630 pathlen = htonl(count); 2631 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4); 2632 return 0; 2633 } 2634 2635 /* Encode as an array of strings the string given with components 2636 * separated @sep. 2637 */ 2638 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep, 2639 char *components) 2640 { 2641 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0); 2642 } 2643 2644 /* 2645 * encode a location element of a fs_locations structure 2646 */ 2647 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr, 2648 struct nfsd4_fs_location *location) 2649 { 2650 __be32 status; 2651 2652 status = nfsd4_encode_components_esc(xdr, ':', location->hosts, 2653 '[', ']'); 2654 if (status) 2655 return status; 2656 status = nfsd4_encode_components(xdr, '/', location->path); 2657 if (status) 2658 return status; 2659 return 0; 2660 } 2661 2662 /* 2663 * Encode a path in RFC3530 'pathname4' format 2664 */ 2665 static __be32 nfsd4_encode_path(struct xdr_stream *xdr, 2666 const struct path *root, 2667 const struct path *path) 2668 { 2669 struct path cur = *path; 2670 __be32 *p; 2671 struct dentry **components = NULL; 2672 unsigned int ncomponents = 0; 2673 __be32 err = nfserr_jukebox; 2674 2675 dprintk("nfsd4_encode_components("); 2676 2677 path_get(&cur); 2678 /* First walk the path up to the nfsd root, and store the 2679 * dentries/path components in an array. 2680 */ 2681 for (;;) { 2682 if (path_equal(&cur, root)) 2683 break; 2684 if (cur.dentry == cur.mnt->mnt_root) { 2685 if (follow_up(&cur)) 2686 continue; 2687 goto out_free; 2688 } 2689 if ((ncomponents & 15) == 0) { 2690 struct dentry **new; 2691 new = krealloc(components, 2692 sizeof(*new) * (ncomponents + 16), 2693 GFP_KERNEL); 2694 if (!new) 2695 goto out_free; 2696 components = new; 2697 } 2698 components[ncomponents++] = cur.dentry; 2699 cur.dentry = dget_parent(cur.dentry); 2700 } 2701 err = nfserr_resource; 2702 p = xdr_reserve_space(xdr, 4); 2703 if (!p) 2704 goto out_free; 2705 *p++ = cpu_to_be32(ncomponents); 2706 2707 while (ncomponents) { 2708 struct dentry *dentry = components[ncomponents - 1]; 2709 unsigned int len; 2710 2711 spin_lock(&dentry->d_lock); 2712 len = dentry->d_name.len; 2713 p = xdr_reserve_space(xdr, len + 4); 2714 if (!p) { 2715 spin_unlock(&dentry->d_lock); 2716 goto out_free; 2717 } 2718 p = xdr_encode_opaque(p, dentry->d_name.name, len); 2719 dprintk("/%pd", dentry); 2720 spin_unlock(&dentry->d_lock); 2721 dput(dentry); 2722 ncomponents--; 2723 } 2724 2725 err = 0; 2726 out_free: 2727 dprintk(")\n"); 2728 while (ncomponents) 2729 dput(components[--ncomponents]); 2730 kfree(components); 2731 path_put(&cur); 2732 return err; 2733 } 2734 2735 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr, 2736 struct svc_rqst *rqstp, const struct path *path) 2737 { 2738 struct svc_export *exp_ps; 2739 __be32 res; 2740 2741 exp_ps = rqst_find_fsidzero_export(rqstp); 2742 if (IS_ERR(exp_ps)) 2743 return nfserrno(PTR_ERR(exp_ps)); 2744 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path); 2745 exp_put(exp_ps); 2746 return res; 2747 } 2748 2749 /* 2750 * encode a fs_locations structure 2751 */ 2752 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr, 2753 struct svc_rqst *rqstp, struct svc_export *exp) 2754 { 2755 __be32 status; 2756 int i; 2757 __be32 *p; 2758 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; 2759 2760 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path); 2761 if (status) 2762 return status; 2763 p = xdr_reserve_space(xdr, 4); 2764 if (!p) 2765 return nfserr_resource; 2766 *p++ = cpu_to_be32(fslocs->locations_count); 2767 for (i=0; i<fslocs->locations_count; i++) { 2768 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]); 2769 if (status) 2770 return status; 2771 } 2772 return 0; 2773 } 2774 2775 static u32 nfs4_file_type(umode_t mode) 2776 { 2777 switch (mode & S_IFMT) { 2778 case S_IFIFO: return NF4FIFO; 2779 case S_IFCHR: return NF4CHR; 2780 case S_IFDIR: return NF4DIR; 2781 case S_IFBLK: return NF4BLK; 2782 case S_IFLNK: return NF4LNK; 2783 case S_IFREG: return NF4REG; 2784 case S_IFSOCK: return NF4SOCK; 2785 default: return NF4BAD; 2786 } 2787 } 2788 2789 static inline __be32 2790 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2791 struct nfs4_ace *ace) 2792 { 2793 if (ace->whotype != NFS4_ACL_WHO_NAMED) 2794 return nfs4_acl_write_who(xdr, ace->whotype); 2795 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 2796 return nfsd4_encode_group(xdr, rqstp, ace->who_gid); 2797 else 2798 return nfsd4_encode_user(xdr, rqstp, ace->who_uid); 2799 } 2800 2801 static inline __be32 2802 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types) 2803 { 2804 __be32 *p; 2805 unsigned long i = hweight_long(layout_types); 2806 2807 p = xdr_reserve_space(xdr, 4 + 4 * i); 2808 if (!p) 2809 return nfserr_resource; 2810 2811 *p++ = cpu_to_be32(i); 2812 2813 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 2814 if (layout_types & (1 << i)) 2815 *p++ = cpu_to_be32(i); 2816 2817 return 0; 2818 } 2819 2820 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ 2821 FATTR4_WORD0_RDATTR_ERROR) 2822 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID 2823 #define WORD2_ABSENT_FS_ATTRS 0 2824 2825 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2826 static inline __be32 2827 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2828 void *context, int len) 2829 { 2830 __be32 *p; 2831 2832 p = xdr_reserve_space(xdr, len + 4 + 4 + 4); 2833 if (!p) 2834 return nfserr_resource; 2835 2836 /* 2837 * For now we use a 0 here to indicate the null translation; in 2838 * the future we may place a call to translation code here. 2839 */ 2840 *p++ = cpu_to_be32(0); /* lfs */ 2841 *p++ = cpu_to_be32(0); /* pi */ 2842 p = xdr_encode_opaque(p, context, len); 2843 return 0; 2844 } 2845 #else 2846 static inline __be32 2847 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2848 void *context, int len) 2849 { return 0; } 2850 #endif 2851 2852 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err) 2853 { 2854 /* As per referral draft: */ 2855 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || 2856 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { 2857 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || 2858 *bmval0 & FATTR4_WORD0_FS_LOCATIONS) 2859 *rdattr_err = NFSERR_MOVED; 2860 else 2861 return nfserr_moved; 2862 } 2863 *bmval0 &= WORD0_ABSENT_FS_ATTRS; 2864 *bmval1 &= WORD1_ABSENT_FS_ATTRS; 2865 *bmval2 &= WORD2_ABSENT_FS_ATTRS; 2866 return 0; 2867 } 2868 2869 2870 static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino) 2871 { 2872 struct path path = exp->ex_path; 2873 struct kstat stat; 2874 int err; 2875 2876 path_get(&path); 2877 while (follow_up(&path)) { 2878 if (path.dentry != path.mnt->mnt_root) 2879 break; 2880 } 2881 err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT); 2882 path_put(&path); 2883 if (!err) 2884 *pino = stat.ino; 2885 return err; 2886 } 2887 2888 static __be32 2889 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2) 2890 { 2891 __be32 *p; 2892 2893 if (bmval2) { 2894 p = xdr_reserve_space(xdr, 16); 2895 if (!p) 2896 goto out_resource; 2897 *p++ = cpu_to_be32(3); 2898 *p++ = cpu_to_be32(bmval0); 2899 *p++ = cpu_to_be32(bmval1); 2900 *p++ = cpu_to_be32(bmval2); 2901 } else if (bmval1) { 2902 p = xdr_reserve_space(xdr, 12); 2903 if (!p) 2904 goto out_resource; 2905 *p++ = cpu_to_be32(2); 2906 *p++ = cpu_to_be32(bmval0); 2907 *p++ = cpu_to_be32(bmval1); 2908 } else { 2909 p = xdr_reserve_space(xdr, 8); 2910 if (!p) 2911 goto out_resource; 2912 *p++ = cpu_to_be32(1); 2913 *p++ = cpu_to_be32(bmval0); 2914 } 2915 2916 return 0; 2917 out_resource: 2918 return nfserr_resource; 2919 } 2920 2921 /* 2922 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 2923 * ourselves. 2924 */ 2925 static __be32 2926 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, 2927 struct svc_export *exp, 2928 struct dentry *dentry, u32 *bmval, 2929 struct svc_rqst *rqstp, int ignore_crossmnt) 2930 { 2931 u32 bmval0 = bmval[0]; 2932 u32 bmval1 = bmval[1]; 2933 u32 bmval2 = bmval[2]; 2934 struct kstat stat; 2935 struct svc_fh *tempfh = NULL; 2936 struct kstatfs statfs; 2937 __be32 *p, *attrlen_p; 2938 int starting_len = xdr->buf->len; 2939 int attrlen_offset; 2940 u32 dummy; 2941 u64 dummy64; 2942 u32 rdattr_err = 0; 2943 __be32 status; 2944 int err; 2945 struct nfs4_acl *acl = NULL; 2946 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2947 void *context = NULL; 2948 int contextlen; 2949 #endif 2950 bool contextsupport = false; 2951 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2952 u32 minorversion = resp->cstate.minorversion; 2953 struct path path = { 2954 .mnt = exp->ex_path.mnt, 2955 .dentry = dentry, 2956 }; 2957 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2958 2959 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); 2960 BUG_ON(!nfsd_attrs_supported(minorversion, bmval)); 2961 2962 if (exp->ex_fslocs.migrated) { 2963 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err); 2964 if (status) 2965 goto out; 2966 } 2967 2968 err = vfs_getattr(&path, &stat, 2969 STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE, 2970 AT_STATX_SYNC_AS_STAT); 2971 if (err) 2972 goto out_nfserr; 2973 if (!(stat.result_mask & STATX_BTIME)) 2974 /* underlying FS does not offer btime so we can't share it */ 2975 bmval1 &= ~FATTR4_WORD1_TIME_CREATE; 2976 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE | 2977 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || 2978 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 2979 FATTR4_WORD1_SPACE_TOTAL))) { 2980 err = vfs_statfs(&path, &statfs); 2981 if (err) 2982 goto out_nfserr; 2983 } 2984 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { 2985 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); 2986 status = nfserr_jukebox; 2987 if (!tempfh) 2988 goto out; 2989 fh_init(tempfh, NFS4_FHSIZE); 2990 status = fh_compose(tempfh, exp, dentry, NULL); 2991 if (status) 2992 goto out; 2993 fhp = tempfh; 2994 } 2995 if (bmval0 & FATTR4_WORD0_ACL) { 2996 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); 2997 if (err == -EOPNOTSUPP) 2998 bmval0 &= ~FATTR4_WORD0_ACL; 2999 else if (err == -EINVAL) { 3000 status = nfserr_attrnotsupp; 3001 goto out; 3002 } else if (err != 0) 3003 goto out_nfserr; 3004 } 3005 3006 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3007 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) || 3008 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 3009 if (exp->ex_flags & NFSEXP_SECURITY_LABEL) 3010 err = security_inode_getsecctx(d_inode(dentry), 3011 &context, &contextlen); 3012 else 3013 err = -EOPNOTSUPP; 3014 contextsupport = (err == 0); 3015 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 3016 if (err == -EOPNOTSUPP) 3017 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL; 3018 else if (err) 3019 goto out_nfserr; 3020 } 3021 } 3022 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 3023 3024 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2); 3025 if (status) 3026 goto out; 3027 3028 attrlen_offset = xdr->buf->len; 3029 attrlen_p = xdr_reserve_space(xdr, XDR_UNIT); 3030 if (!attrlen_p) 3031 goto out_resource; 3032 3033 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 3034 u32 supp[3]; 3035 3036 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 3037 3038 if (!IS_POSIXACL(dentry->d_inode)) 3039 supp[0] &= ~FATTR4_WORD0_ACL; 3040 if (!contextsupport) 3041 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3042 if (!supp[2]) { 3043 p = xdr_reserve_space(xdr, 12); 3044 if (!p) 3045 goto out_resource; 3046 *p++ = cpu_to_be32(2); 3047 *p++ = cpu_to_be32(supp[0]); 3048 *p++ = cpu_to_be32(supp[1]); 3049 } else { 3050 p = xdr_reserve_space(xdr, 16); 3051 if (!p) 3052 goto out_resource; 3053 *p++ = cpu_to_be32(3); 3054 *p++ = cpu_to_be32(supp[0]); 3055 *p++ = cpu_to_be32(supp[1]); 3056 *p++ = cpu_to_be32(supp[2]); 3057 } 3058 } 3059 if (bmval0 & FATTR4_WORD0_TYPE) { 3060 p = xdr_reserve_space(xdr, 4); 3061 if (!p) 3062 goto out_resource; 3063 dummy = nfs4_file_type(stat.mode); 3064 if (dummy == NF4BAD) { 3065 status = nfserr_serverfault; 3066 goto out; 3067 } 3068 *p++ = cpu_to_be32(dummy); 3069 } 3070 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { 3071 p = xdr_reserve_space(xdr, 4); 3072 if (!p) 3073 goto out_resource; 3074 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 3075 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT); 3076 else 3077 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT| 3078 NFS4_FH_VOL_RENAME); 3079 } 3080 if (bmval0 & FATTR4_WORD0_CHANGE) { 3081 p = xdr_reserve_space(xdr, 8); 3082 if (!p) 3083 goto out_resource; 3084 p = encode_change(p, &stat, d_inode(dentry), exp); 3085 } 3086 if (bmval0 & FATTR4_WORD0_SIZE) { 3087 p = xdr_reserve_space(xdr, 8); 3088 if (!p) 3089 goto out_resource; 3090 p = xdr_encode_hyper(p, stat.size); 3091 } 3092 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { 3093 p = xdr_reserve_space(xdr, 4); 3094 if (!p) 3095 goto out_resource; 3096 *p++ = cpu_to_be32(1); 3097 } 3098 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { 3099 p = xdr_reserve_space(xdr, 4); 3100 if (!p) 3101 goto out_resource; 3102 *p++ = cpu_to_be32(1); 3103 } 3104 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { 3105 p = xdr_reserve_space(xdr, 4); 3106 if (!p) 3107 goto out_resource; 3108 *p++ = cpu_to_be32(0); 3109 } 3110 if (bmval0 & FATTR4_WORD0_FSID) { 3111 p = xdr_reserve_space(xdr, 16); 3112 if (!p) 3113 goto out_resource; 3114 if (exp->ex_fslocs.migrated) { 3115 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR); 3116 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR); 3117 } else switch(fsid_source(fhp)) { 3118 case FSIDSOURCE_FSID: 3119 p = xdr_encode_hyper(p, (u64)exp->ex_fsid); 3120 p = xdr_encode_hyper(p, (u64)0); 3121 break; 3122 case FSIDSOURCE_DEV: 3123 *p++ = cpu_to_be32(0); 3124 *p++ = cpu_to_be32(MAJOR(stat.dev)); 3125 *p++ = cpu_to_be32(0); 3126 *p++ = cpu_to_be32(MINOR(stat.dev)); 3127 break; 3128 case FSIDSOURCE_UUID: 3129 p = xdr_encode_opaque_fixed(p, exp->ex_uuid, 3130 EX_UUID_LEN); 3131 break; 3132 } 3133 } 3134 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { 3135 p = xdr_reserve_space(xdr, 4); 3136 if (!p) 3137 goto out_resource; 3138 *p++ = cpu_to_be32(0); 3139 } 3140 if (bmval0 & FATTR4_WORD0_LEASE_TIME) { 3141 p = xdr_reserve_space(xdr, 4); 3142 if (!p) 3143 goto out_resource; 3144 *p++ = cpu_to_be32(nn->nfsd4_lease); 3145 } 3146 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { 3147 p = xdr_reserve_space(xdr, 4); 3148 if (!p) 3149 goto out_resource; 3150 *p++ = cpu_to_be32(rdattr_err); 3151 } 3152 if (bmval0 & FATTR4_WORD0_ACL) { 3153 struct nfs4_ace *ace; 3154 3155 if (acl == NULL) { 3156 p = xdr_reserve_space(xdr, 4); 3157 if (!p) 3158 goto out_resource; 3159 3160 *p++ = cpu_to_be32(0); 3161 goto out_acl; 3162 } 3163 p = xdr_reserve_space(xdr, 4); 3164 if (!p) 3165 goto out_resource; 3166 *p++ = cpu_to_be32(acl->naces); 3167 3168 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 3169 p = xdr_reserve_space(xdr, 4*3); 3170 if (!p) 3171 goto out_resource; 3172 *p++ = cpu_to_be32(ace->type); 3173 *p++ = cpu_to_be32(ace->flag); 3174 *p++ = cpu_to_be32(ace->access_mask & 3175 NFS4_ACE_MASK_ALL); 3176 status = nfsd4_encode_aclname(xdr, rqstp, ace); 3177 if (status) 3178 goto out; 3179 } 3180 } 3181 out_acl: 3182 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { 3183 p = xdr_reserve_space(xdr, 4); 3184 if (!p) 3185 goto out_resource; 3186 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ? 3187 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); 3188 } 3189 if (bmval0 & FATTR4_WORD0_CANSETTIME) { 3190 p = xdr_reserve_space(xdr, 4); 3191 if (!p) 3192 goto out_resource; 3193 *p++ = cpu_to_be32(1); 3194 } 3195 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { 3196 p = xdr_reserve_space(xdr, 4); 3197 if (!p) 3198 goto out_resource; 3199 *p++ = cpu_to_be32(0); 3200 } 3201 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { 3202 p = xdr_reserve_space(xdr, 4); 3203 if (!p) 3204 goto out_resource; 3205 *p++ = cpu_to_be32(1); 3206 } 3207 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { 3208 p = xdr_reserve_space(xdr, 4); 3209 if (!p) 3210 goto out_resource; 3211 *p++ = cpu_to_be32(1); 3212 } 3213 if (bmval0 & FATTR4_WORD0_FILEHANDLE) { 3214 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4); 3215 if (!p) 3216 goto out_resource; 3217 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, 3218 fhp->fh_handle.fh_size); 3219 } 3220 if (bmval0 & FATTR4_WORD0_FILEID) { 3221 p = xdr_reserve_space(xdr, 8); 3222 if (!p) 3223 goto out_resource; 3224 p = xdr_encode_hyper(p, stat.ino); 3225 } 3226 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { 3227 p = xdr_reserve_space(xdr, 8); 3228 if (!p) 3229 goto out_resource; 3230 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 3231 } 3232 if (bmval0 & FATTR4_WORD0_FILES_FREE) { 3233 p = xdr_reserve_space(xdr, 8); 3234 if (!p) 3235 goto out_resource; 3236 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 3237 } 3238 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { 3239 p = xdr_reserve_space(xdr, 8); 3240 if (!p) 3241 goto out_resource; 3242 p = xdr_encode_hyper(p, (u64) statfs.f_files); 3243 } 3244 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) { 3245 status = nfsd4_encode_fs_locations(xdr, rqstp, exp); 3246 if (status) 3247 goto out; 3248 } 3249 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { 3250 p = xdr_reserve_space(xdr, 4); 3251 if (!p) 3252 goto out_resource; 3253 *p++ = cpu_to_be32(1); 3254 } 3255 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { 3256 p = xdr_reserve_space(xdr, 8); 3257 if (!p) 3258 goto out_resource; 3259 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes); 3260 } 3261 if (bmval0 & FATTR4_WORD0_MAXLINK) { 3262 p = xdr_reserve_space(xdr, 4); 3263 if (!p) 3264 goto out_resource; 3265 *p++ = cpu_to_be32(255); 3266 } 3267 if (bmval0 & FATTR4_WORD0_MAXNAME) { 3268 p = xdr_reserve_space(xdr, 4); 3269 if (!p) 3270 goto out_resource; 3271 *p++ = cpu_to_be32(statfs.f_namelen); 3272 } 3273 if (bmval0 & FATTR4_WORD0_MAXREAD) { 3274 p = xdr_reserve_space(xdr, 8); 3275 if (!p) 3276 goto out_resource; 3277 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 3278 } 3279 if (bmval0 & FATTR4_WORD0_MAXWRITE) { 3280 p = xdr_reserve_space(xdr, 8); 3281 if (!p) 3282 goto out_resource; 3283 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 3284 } 3285 if (bmval1 & FATTR4_WORD1_MODE) { 3286 p = xdr_reserve_space(xdr, 4); 3287 if (!p) 3288 goto out_resource; 3289 *p++ = cpu_to_be32(stat.mode & S_IALLUGO); 3290 } 3291 if (bmval1 & FATTR4_WORD1_NO_TRUNC) { 3292 p = xdr_reserve_space(xdr, 4); 3293 if (!p) 3294 goto out_resource; 3295 *p++ = cpu_to_be32(1); 3296 } 3297 if (bmval1 & FATTR4_WORD1_NUMLINKS) { 3298 p = xdr_reserve_space(xdr, 4); 3299 if (!p) 3300 goto out_resource; 3301 *p++ = cpu_to_be32(stat.nlink); 3302 } 3303 if (bmval1 & FATTR4_WORD1_OWNER) { 3304 status = nfsd4_encode_user(xdr, rqstp, stat.uid); 3305 if (status) 3306 goto out; 3307 } 3308 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { 3309 status = nfsd4_encode_group(xdr, rqstp, stat.gid); 3310 if (status) 3311 goto out; 3312 } 3313 if (bmval1 & FATTR4_WORD1_RAWDEV) { 3314 p = xdr_reserve_space(xdr, 8); 3315 if (!p) 3316 goto out_resource; 3317 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev)); 3318 *p++ = cpu_to_be32((u32) MINOR(stat.rdev)); 3319 } 3320 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { 3321 p = xdr_reserve_space(xdr, 8); 3322 if (!p) 3323 goto out_resource; 3324 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; 3325 p = xdr_encode_hyper(p, dummy64); 3326 } 3327 if (bmval1 & FATTR4_WORD1_SPACE_FREE) { 3328 p = xdr_reserve_space(xdr, 8); 3329 if (!p) 3330 goto out_resource; 3331 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; 3332 p = xdr_encode_hyper(p, dummy64); 3333 } 3334 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { 3335 p = xdr_reserve_space(xdr, 8); 3336 if (!p) 3337 goto out_resource; 3338 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; 3339 p = xdr_encode_hyper(p, dummy64); 3340 } 3341 if (bmval1 & FATTR4_WORD1_SPACE_USED) { 3342 p = xdr_reserve_space(xdr, 8); 3343 if (!p) 3344 goto out_resource; 3345 dummy64 = (u64)stat.blocks << 9; 3346 p = xdr_encode_hyper(p, dummy64); 3347 } 3348 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { 3349 p = xdr_reserve_space(xdr, 12); 3350 if (!p) 3351 goto out_resource; 3352 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec); 3353 *p++ = cpu_to_be32(stat.atime.tv_nsec); 3354 } 3355 if (bmval1 & FATTR4_WORD1_TIME_DELTA) { 3356 p = xdr_reserve_space(xdr, 12); 3357 if (!p) 3358 goto out_resource; 3359 p = encode_time_delta(p, d_inode(dentry)); 3360 } 3361 if (bmval1 & FATTR4_WORD1_TIME_METADATA) { 3362 p = xdr_reserve_space(xdr, 12); 3363 if (!p) 3364 goto out_resource; 3365 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec); 3366 *p++ = cpu_to_be32(stat.ctime.tv_nsec); 3367 } 3368 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { 3369 p = xdr_reserve_space(xdr, 12); 3370 if (!p) 3371 goto out_resource; 3372 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec); 3373 *p++ = cpu_to_be32(stat.mtime.tv_nsec); 3374 } 3375 if (bmval1 & FATTR4_WORD1_TIME_CREATE) { 3376 p = xdr_reserve_space(xdr, 12); 3377 if (!p) 3378 goto out_resource; 3379 p = xdr_encode_hyper(p, (s64)stat.btime.tv_sec); 3380 *p++ = cpu_to_be32(stat.btime.tv_nsec); 3381 } 3382 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { 3383 u64 ino = stat.ino; 3384 3385 p = xdr_reserve_space(xdr, 8); 3386 if (!p) 3387 goto out_resource; 3388 /* 3389 * Get ino of mountpoint in parent filesystem, if not ignoring 3390 * crossmount and this is the root of a cross-mounted 3391 * filesystem. 3392 */ 3393 if (ignore_crossmnt == 0 && 3394 dentry == exp->ex_path.mnt->mnt_root) { 3395 err = nfsd4_get_mounted_on_ino(exp, &ino); 3396 if (err) 3397 goto out_nfserr; 3398 } 3399 p = xdr_encode_hyper(p, ino); 3400 } 3401 #ifdef CONFIG_NFSD_PNFS 3402 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) { 3403 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 3404 if (status) 3405 goto out; 3406 } 3407 3408 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) { 3409 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 3410 if (status) 3411 goto out; 3412 } 3413 3414 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) { 3415 p = xdr_reserve_space(xdr, 4); 3416 if (!p) 3417 goto out_resource; 3418 *p++ = cpu_to_be32(stat.blksize); 3419 } 3420 #endif /* CONFIG_NFSD_PNFS */ 3421 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) { 3422 u32 supp[3]; 3423 3424 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 3425 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0; 3426 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1; 3427 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2; 3428 3429 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]); 3430 if (status) 3431 goto out; 3432 } 3433 3434 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3435 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 3436 status = nfsd4_encode_security_label(xdr, rqstp, context, 3437 contextlen); 3438 if (status) 3439 goto out; 3440 } 3441 #endif 3442 3443 if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) { 3444 p = xdr_reserve_space(xdr, 4); 3445 if (!p) 3446 goto out_resource; 3447 err = xattr_supported_namespace(d_inode(dentry), 3448 XATTR_USER_PREFIX); 3449 *p++ = cpu_to_be32(err == 0); 3450 } 3451 3452 *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT); 3453 status = nfs_ok; 3454 3455 out: 3456 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3457 if (context) 3458 security_release_secctx(context, contextlen); 3459 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 3460 kfree(acl); 3461 if (tempfh) { 3462 fh_put(tempfh); 3463 kfree(tempfh); 3464 } 3465 if (status) 3466 xdr_truncate_encode(xdr, starting_len); 3467 return status; 3468 out_nfserr: 3469 status = nfserrno(err); 3470 goto out; 3471 out_resource: 3472 status = nfserr_resource; 3473 goto out; 3474 } 3475 3476 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, 3477 struct xdr_buf *buf, __be32 *p, int bytes) 3478 { 3479 xdr->scratch.iov_len = 0; 3480 memset(buf, 0, sizeof(struct xdr_buf)); 3481 buf->head[0].iov_base = p; 3482 buf->head[0].iov_len = 0; 3483 buf->len = 0; 3484 xdr->buf = buf; 3485 xdr->iov = buf->head; 3486 xdr->p = p; 3487 xdr->end = (void *)p + bytes; 3488 buf->buflen = bytes; 3489 } 3490 3491 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, 3492 struct svc_fh *fhp, struct svc_export *exp, 3493 struct dentry *dentry, u32 *bmval, 3494 struct svc_rqst *rqstp, int ignore_crossmnt) 3495 { 3496 struct xdr_buf dummy; 3497 struct xdr_stream xdr; 3498 __be32 ret; 3499 3500 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); 3501 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp, 3502 ignore_crossmnt); 3503 *p = xdr.p; 3504 return ret; 3505 } 3506 3507 static inline int attributes_need_mount(u32 *bmval) 3508 { 3509 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) 3510 return 1; 3511 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) 3512 return 1; 3513 return 0; 3514 } 3515 3516 static __be32 3517 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd, 3518 const char *name, int namlen) 3519 { 3520 struct svc_export *exp = cd->rd_fhp->fh_export; 3521 struct dentry *dentry; 3522 __be32 nfserr; 3523 int ignore_crossmnt = 0; 3524 3525 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen); 3526 if (IS_ERR(dentry)) 3527 return nfserrno(PTR_ERR(dentry)); 3528 3529 exp_get(exp); 3530 /* 3531 * In the case of a mountpoint, the client may be asking for 3532 * attributes that are only properties of the underlying filesystem 3533 * as opposed to the cross-mounted file system. In such a case, 3534 * we will not follow the cross mount and will fill the attribtutes 3535 * directly from the mountpoint dentry. 3536 */ 3537 if (nfsd_mountpoint(dentry, exp)) { 3538 int err; 3539 3540 if (!(exp->ex_flags & NFSEXP_V4ROOT) 3541 && !attributes_need_mount(cd->rd_bmval)) { 3542 ignore_crossmnt = 1; 3543 goto out_encode; 3544 } 3545 /* 3546 * Why the heck aren't we just using nfsd_lookup?? 3547 * Different "."/".." handling? Something else? 3548 * At least, add a comment here to explain.... 3549 */ 3550 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); 3551 if (err) { 3552 nfserr = nfserrno(err); 3553 goto out_put; 3554 } 3555 nfserr = check_nfsd_access(exp, cd->rd_rqstp); 3556 if (nfserr) 3557 goto out_put; 3558 3559 } 3560 out_encode: 3561 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval, 3562 cd->rd_rqstp, ignore_crossmnt); 3563 out_put: 3564 dput(dentry); 3565 exp_put(exp); 3566 return nfserr; 3567 } 3568 3569 static __be32 * 3570 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr) 3571 { 3572 __be32 *p; 3573 3574 p = xdr_reserve_space(xdr, 20); 3575 if (!p) 3576 return NULL; 3577 *p++ = htonl(2); 3578 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ 3579 *p++ = htonl(0); /* bmval1 */ 3580 3581 *p++ = htonl(4); /* attribute length */ 3582 *p++ = nfserr; /* no htonl */ 3583 return p; 3584 } 3585 3586 static int 3587 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen, 3588 loff_t offset, u64 ino, unsigned int d_type) 3589 { 3590 struct readdir_cd *ccd = ccdv; 3591 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 3592 struct xdr_stream *xdr = cd->xdr; 3593 int start_offset = xdr->buf->len; 3594 int cookie_offset; 3595 u32 name_and_cookie; 3596 int entry_bytes; 3597 __be32 nfserr = nfserr_toosmall; 3598 __be64 wire_offset; 3599 __be32 *p; 3600 3601 /* In nfsv4, "." and ".." never make it onto the wire.. */ 3602 if (name && isdotent(name, namlen)) { 3603 cd->common.err = nfs_ok; 3604 return 0; 3605 } 3606 3607 if (cd->cookie_offset) { 3608 wire_offset = cpu_to_be64(offset); 3609 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset, 3610 &wire_offset, 8); 3611 } 3612 3613 p = xdr_reserve_space(xdr, 4); 3614 if (!p) 3615 goto fail; 3616 *p++ = xdr_one; /* mark entry present */ 3617 cookie_offset = xdr->buf->len; 3618 p = xdr_reserve_space(xdr, 3*4 + namlen); 3619 if (!p) 3620 goto fail; 3621 p = xdr_encode_hyper(p, OFFSET_MAX); /* offset of next entry */ 3622 p = xdr_encode_array(p, name, namlen); /* name length & name */ 3623 3624 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen); 3625 switch (nfserr) { 3626 case nfs_ok: 3627 break; 3628 case nfserr_resource: 3629 nfserr = nfserr_toosmall; 3630 goto fail; 3631 case nfserr_noent: 3632 xdr_truncate_encode(xdr, start_offset); 3633 goto skip_entry; 3634 case nfserr_jukebox: 3635 /* 3636 * The pseudoroot should only display dentries that lead to 3637 * exports. If we get EJUKEBOX here, then we can't tell whether 3638 * this entry should be included. Just fail the whole READDIR 3639 * with NFS4ERR_DELAY in that case, and hope that the situation 3640 * will resolve itself by the client's next attempt. 3641 */ 3642 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT) 3643 goto fail; 3644 fallthrough; 3645 default: 3646 /* 3647 * If the client requested the RDATTR_ERROR attribute, 3648 * we stuff the error code into this attribute 3649 * and continue. If this attribute was not requested, 3650 * then in accordance with the spec, we fail the 3651 * entire READDIR operation(!) 3652 */ 3653 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 3654 goto fail; 3655 p = nfsd4_encode_rdattr_error(xdr, nfserr); 3656 if (p == NULL) { 3657 nfserr = nfserr_toosmall; 3658 goto fail; 3659 } 3660 } 3661 nfserr = nfserr_toosmall; 3662 entry_bytes = xdr->buf->len - start_offset; 3663 if (entry_bytes > cd->rd_maxcount) 3664 goto fail; 3665 cd->rd_maxcount -= entry_bytes; 3666 /* 3667 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and 3668 * notes that it could be zero. If it is zero, then the server 3669 * should enforce only the rd_maxcount value. 3670 */ 3671 if (cd->rd_dircount) { 3672 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8; 3673 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset) 3674 goto fail; 3675 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie); 3676 if (!cd->rd_dircount) 3677 cd->rd_maxcount = 0; 3678 } 3679 3680 cd->cookie_offset = cookie_offset; 3681 skip_entry: 3682 cd->common.err = nfs_ok; 3683 return 0; 3684 fail: 3685 xdr_truncate_encode(xdr, start_offset); 3686 cd->common.err = nfserr; 3687 return -EINVAL; 3688 } 3689 3690 static __be32 3691 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid) 3692 { 3693 __be32 *p; 3694 3695 p = xdr_reserve_space(xdr, sizeof(stateid_t)); 3696 if (!p) 3697 return nfserr_resource; 3698 *p++ = cpu_to_be32(sid->si_generation); 3699 p = xdr_encode_opaque_fixed(p, &sid->si_opaque, 3700 sizeof(stateid_opaque_t)); 3701 return 0; 3702 } 3703 3704 static __be32 3705 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, 3706 union nfsd4_op_u *u) 3707 { 3708 struct nfsd4_access *access = &u->access; 3709 struct xdr_stream *xdr = resp->xdr; 3710 __be32 *p; 3711 3712 p = xdr_reserve_space(xdr, 8); 3713 if (!p) 3714 return nfserr_resource; 3715 *p++ = cpu_to_be32(access->ac_supported); 3716 *p++ = cpu_to_be32(access->ac_resp_access); 3717 return 0; 3718 } 3719 3720 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, 3721 union nfsd4_op_u *u) 3722 { 3723 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session; 3724 struct xdr_stream *xdr = resp->xdr; 3725 __be32 *p; 3726 3727 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8); 3728 if (!p) 3729 return nfserr_resource; 3730 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data, 3731 NFS4_MAX_SESSIONID_LEN); 3732 *p++ = cpu_to_be32(bcts->dir); 3733 /* Upshifting from TCP to RDMA is not supported */ 3734 *p++ = cpu_to_be32(0); 3735 return 0; 3736 } 3737 3738 static __be32 3739 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, 3740 union nfsd4_op_u *u) 3741 { 3742 struct nfsd4_close *close = &u->close; 3743 struct xdr_stream *xdr = resp->xdr; 3744 3745 return nfsd4_encode_stateid(xdr, &close->cl_stateid); 3746 } 3747 3748 3749 static __be32 3750 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, 3751 union nfsd4_op_u *u) 3752 { 3753 struct nfsd4_commit *commit = &u->commit; 3754 struct xdr_stream *xdr = resp->xdr; 3755 __be32 *p; 3756 3757 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3758 if (!p) 3759 return nfserr_resource; 3760 p = xdr_encode_opaque_fixed(p, commit->co_verf.data, 3761 NFS4_VERIFIER_SIZE); 3762 return 0; 3763 } 3764 3765 static __be32 3766 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, 3767 union nfsd4_op_u *u) 3768 { 3769 struct nfsd4_create *create = &u->create; 3770 struct xdr_stream *xdr = resp->xdr; 3771 __be32 *p; 3772 3773 p = xdr_reserve_space(xdr, 20); 3774 if (!p) 3775 return nfserr_resource; 3776 encode_cinfo(p, &create->cr_cinfo); 3777 return nfsd4_encode_bitmap(xdr, create->cr_bmval[0], 3778 create->cr_bmval[1], create->cr_bmval[2]); 3779 } 3780 3781 static __be32 3782 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, 3783 union nfsd4_op_u *u) 3784 { 3785 struct nfsd4_getattr *getattr = &u->getattr; 3786 struct svc_fh *fhp = getattr->ga_fhp; 3787 struct xdr_stream *xdr = resp->xdr; 3788 3789 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry, 3790 getattr->ga_bmval, resp->rqstp, 0); 3791 } 3792 3793 static __be32 3794 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, 3795 union nfsd4_op_u *u) 3796 { 3797 struct svc_fh **fhpp = &u->getfh; 3798 struct xdr_stream *xdr = resp->xdr; 3799 struct svc_fh *fhp = *fhpp; 3800 unsigned int len; 3801 __be32 *p; 3802 3803 len = fhp->fh_handle.fh_size; 3804 p = xdr_reserve_space(xdr, len + 4); 3805 if (!p) 3806 return nfserr_resource; 3807 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len); 3808 return 0; 3809 } 3810 3811 /* 3812 * Including all fields other than the name, a LOCK4denied structure requires 3813 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. 3814 */ 3815 static __be32 3816 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld) 3817 { 3818 struct xdr_netobj *conf = &ld->ld_owner; 3819 __be32 *p; 3820 3821 again: 3822 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len)); 3823 if (!p) { 3824 /* 3825 * Don't fail to return the result just because we can't 3826 * return the conflicting open: 3827 */ 3828 if (conf->len) { 3829 kfree(conf->data); 3830 conf->len = 0; 3831 conf->data = NULL; 3832 goto again; 3833 } 3834 return nfserr_resource; 3835 } 3836 p = xdr_encode_hyper(p, ld->ld_start); 3837 p = xdr_encode_hyper(p, ld->ld_length); 3838 *p++ = cpu_to_be32(ld->ld_type); 3839 if (conf->len) { 3840 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8); 3841 p = xdr_encode_opaque(p, conf->data, conf->len); 3842 kfree(conf->data); 3843 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ 3844 p = xdr_encode_hyper(p, (u64)0); /* clientid */ 3845 *p++ = cpu_to_be32(0); /* length of owner name */ 3846 } 3847 return nfserr_denied; 3848 } 3849 3850 static __be32 3851 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, 3852 union nfsd4_op_u *u) 3853 { 3854 struct nfsd4_lock *lock = &u->lock; 3855 struct xdr_stream *xdr = resp->xdr; 3856 3857 if (!nfserr) 3858 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid); 3859 else if (nfserr == nfserr_denied) 3860 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied); 3861 3862 return nfserr; 3863 } 3864 3865 static __be32 3866 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, 3867 union nfsd4_op_u *u) 3868 { 3869 struct nfsd4_lockt *lockt = &u->lockt; 3870 struct xdr_stream *xdr = resp->xdr; 3871 3872 if (nfserr == nfserr_denied) 3873 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied); 3874 return nfserr; 3875 } 3876 3877 static __be32 3878 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, 3879 union nfsd4_op_u *u) 3880 { 3881 struct nfsd4_locku *locku = &u->locku; 3882 struct xdr_stream *xdr = resp->xdr; 3883 3884 return nfsd4_encode_stateid(xdr, &locku->lu_stateid); 3885 } 3886 3887 3888 static __be32 3889 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, 3890 union nfsd4_op_u *u) 3891 { 3892 struct nfsd4_link *link = &u->link; 3893 struct xdr_stream *xdr = resp->xdr; 3894 __be32 *p; 3895 3896 p = xdr_reserve_space(xdr, 20); 3897 if (!p) 3898 return nfserr_resource; 3899 p = encode_cinfo(p, &link->li_cinfo); 3900 return 0; 3901 } 3902 3903 3904 static __be32 3905 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, 3906 union nfsd4_op_u *u) 3907 { 3908 struct nfsd4_open *open = &u->open; 3909 struct xdr_stream *xdr = resp->xdr; 3910 __be32 *p; 3911 3912 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid); 3913 if (nfserr) 3914 return nfserr; 3915 p = xdr_reserve_space(xdr, 24); 3916 if (!p) 3917 return nfserr_resource; 3918 p = encode_cinfo(p, &open->op_cinfo); 3919 *p++ = cpu_to_be32(open->op_rflags); 3920 3921 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1], 3922 open->op_bmval[2]); 3923 if (nfserr) 3924 return nfserr; 3925 3926 p = xdr_reserve_space(xdr, 4); 3927 if (!p) 3928 return nfserr_resource; 3929 3930 *p++ = cpu_to_be32(open->op_delegate_type); 3931 switch (open->op_delegate_type) { 3932 case NFS4_OPEN_DELEGATE_NONE: 3933 break; 3934 case NFS4_OPEN_DELEGATE_READ: 3935 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3936 if (nfserr) 3937 return nfserr; 3938 p = xdr_reserve_space(xdr, 20); 3939 if (!p) 3940 return nfserr_resource; 3941 *p++ = cpu_to_be32(open->op_recall); 3942 3943 /* 3944 * TODO: ACE's in delegations 3945 */ 3946 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3947 *p++ = cpu_to_be32(0); 3948 *p++ = cpu_to_be32(0); 3949 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3950 break; 3951 case NFS4_OPEN_DELEGATE_WRITE: 3952 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3953 if (nfserr) 3954 return nfserr; 3955 p = xdr_reserve_space(xdr, 32); 3956 if (!p) 3957 return nfserr_resource; 3958 *p++ = cpu_to_be32(0); 3959 3960 /* 3961 * TODO: space_limit's in delegations 3962 */ 3963 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE); 3964 *p++ = cpu_to_be32(~(u32)0); 3965 *p++ = cpu_to_be32(~(u32)0); 3966 3967 /* 3968 * TODO: ACE's in delegations 3969 */ 3970 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3971 *p++ = cpu_to_be32(0); 3972 *p++ = cpu_to_be32(0); 3973 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3974 break; 3975 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */ 3976 switch (open->op_why_no_deleg) { 3977 case WND4_CONTENTION: 3978 case WND4_RESOURCE: 3979 p = xdr_reserve_space(xdr, 8); 3980 if (!p) 3981 return nfserr_resource; 3982 *p++ = cpu_to_be32(open->op_why_no_deleg); 3983 /* deleg signaling not supported yet: */ 3984 *p++ = cpu_to_be32(0); 3985 break; 3986 default: 3987 p = xdr_reserve_space(xdr, 4); 3988 if (!p) 3989 return nfserr_resource; 3990 *p++ = cpu_to_be32(open->op_why_no_deleg); 3991 } 3992 break; 3993 default: 3994 BUG(); 3995 } 3996 /* XXX save filehandle here */ 3997 return 0; 3998 } 3999 4000 static __be32 4001 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, 4002 union nfsd4_op_u *u) 4003 { 4004 struct nfsd4_open_confirm *oc = &u->open_confirm; 4005 struct xdr_stream *xdr = resp->xdr; 4006 4007 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid); 4008 } 4009 4010 static __be32 4011 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, 4012 union nfsd4_op_u *u) 4013 { 4014 struct nfsd4_open_downgrade *od = &u->open_downgrade; 4015 struct xdr_stream *xdr = resp->xdr; 4016 4017 return nfsd4_encode_stateid(xdr, &od->od_stateid); 4018 } 4019 4020 static __be32 nfsd4_encode_splice_read( 4021 struct nfsd4_compoundres *resp, 4022 struct nfsd4_read *read, 4023 struct file *file, unsigned long maxcount) 4024 { 4025 struct xdr_stream *xdr = resp->xdr; 4026 struct xdr_buf *buf = xdr->buf; 4027 int status, space_left; 4028 __be32 nfserr; 4029 4030 /* Make sure there will be room for padding if needed */ 4031 if (xdr->end - xdr->p < 1) 4032 return nfserr_resource; 4033 4034 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp, 4035 file, read->rd_offset, &maxcount, 4036 &read->rd_eof); 4037 read->rd_length = maxcount; 4038 if (nfserr) 4039 goto out_err; 4040 status = svc_encode_result_payload(read->rd_rqstp, 4041 buf->head[0].iov_len, maxcount); 4042 if (status) { 4043 nfserr = nfserrno(status); 4044 goto out_err; 4045 } 4046 4047 buf->page_len = maxcount; 4048 buf->len += maxcount; 4049 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1) 4050 / PAGE_SIZE; 4051 4052 /* Use rest of head for padding and remaining ops: */ 4053 buf->tail[0].iov_base = xdr->p; 4054 buf->tail[0].iov_len = 0; 4055 xdr->iov = buf->tail; 4056 if (maxcount&3) { 4057 int pad = 4 - (maxcount&3); 4058 4059 *(xdr->p++) = 0; 4060 4061 buf->tail[0].iov_base += maxcount&3; 4062 buf->tail[0].iov_len = pad; 4063 buf->len += pad; 4064 } 4065 4066 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p, 4067 buf->buflen - buf->len); 4068 buf->buflen = buf->len + space_left; 4069 xdr->end = (__be32 *)((void *)xdr->end + space_left); 4070 4071 return 0; 4072 4073 out_err: 4074 /* 4075 * nfsd_splice_actor may have already messed with the 4076 * page length; reset it so as not to confuse 4077 * xdr_truncate_encode in our caller. 4078 */ 4079 buf->page_len = 0; 4080 return nfserr; 4081 } 4082 4083 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, 4084 struct nfsd4_read *read, 4085 struct file *file, unsigned long maxcount) 4086 { 4087 struct xdr_stream *xdr = resp->xdr; 4088 unsigned int starting_len = xdr->buf->len; 4089 __be32 zero = xdr_zero; 4090 __be32 nfserr; 4091 4092 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount); 4093 if (read->rd_vlen < 0) 4094 return nfserr_resource; 4095 4096 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset, 4097 resp->rqstp->rq_vec, read->rd_vlen, &maxcount, 4098 &read->rd_eof); 4099 read->rd_length = maxcount; 4100 if (nfserr) 4101 return nfserr; 4102 if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount)) 4103 return nfserr_io; 4104 xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount)); 4105 4106 write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero, 4107 xdr_pad_size(maxcount)); 4108 return nfs_ok; 4109 } 4110 4111 static __be32 4112 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 4113 union nfsd4_op_u *u) 4114 { 4115 struct nfsd4_read *read = &u->read; 4116 bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags); 4117 unsigned long maxcount; 4118 struct xdr_stream *xdr = resp->xdr; 4119 struct file *file; 4120 int starting_len = xdr->buf->len; 4121 __be32 *p; 4122 4123 if (nfserr) 4124 return nfserr; 4125 file = read->rd_nf->nf_file; 4126 4127 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ 4128 if (!p) { 4129 WARN_ON_ONCE(splice_ok); 4130 return nfserr_resource; 4131 } 4132 if (resp->xdr->buf->page_len && splice_ok) { 4133 WARN_ON_ONCE(1); 4134 return nfserr_serverfault; 4135 } 4136 xdr_commit_encode(xdr); 4137 4138 maxcount = min_t(unsigned long, read->rd_length, 4139 (xdr->buf->buflen - xdr->buf->len)); 4140 4141 if (file->f_op->splice_read && splice_ok) 4142 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 4143 else 4144 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 4145 if (nfserr) { 4146 xdr_truncate_encode(xdr, starting_len); 4147 return nfserr; 4148 } 4149 4150 p = xdr_encode_bool(p, read->rd_eof); 4151 *p = cpu_to_be32(read->rd_length); 4152 return nfs_ok; 4153 } 4154 4155 static __be32 4156 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, 4157 union nfsd4_op_u *u) 4158 { 4159 struct nfsd4_readlink *readlink = &u->readlink; 4160 __be32 *p, *maxcount_p, zero = xdr_zero; 4161 struct xdr_stream *xdr = resp->xdr; 4162 int length_offset = xdr->buf->len; 4163 int maxcount, status; 4164 4165 maxcount_p = xdr_reserve_space(xdr, XDR_UNIT); 4166 if (!maxcount_p) 4167 return nfserr_resource; 4168 maxcount = PAGE_SIZE; 4169 4170 p = xdr_reserve_space(xdr, maxcount); 4171 if (!p) 4172 return nfserr_resource; 4173 /* 4174 * XXX: By default, vfs_readlink() will truncate symlinks if they 4175 * would overflow the buffer. Is this kosher in NFSv4? If not, one 4176 * easy fix is: if vfs_readlink() precisely fills the buffer, assume 4177 * that truncation occurred, and return NFS4ERR_RESOURCE. 4178 */ 4179 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, 4180 (char *)p, &maxcount); 4181 if (nfserr == nfserr_isdir) 4182 nfserr = nfserr_inval; 4183 if (nfserr) 4184 goto out_err; 4185 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset, 4186 maxcount); 4187 if (status) { 4188 nfserr = nfserrno(status); 4189 goto out_err; 4190 } 4191 *maxcount_p = cpu_to_be32(maxcount); 4192 xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount)); 4193 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero, 4194 xdr_pad_size(maxcount)); 4195 return nfs_ok; 4196 4197 out_err: 4198 xdr_truncate_encode(xdr, length_offset); 4199 return nfserr; 4200 } 4201 4202 static __be32 4203 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, 4204 union nfsd4_op_u *u) 4205 { 4206 struct nfsd4_readdir *readdir = &u->readdir; 4207 int maxcount; 4208 int bytes_left; 4209 loff_t offset; 4210 __be64 wire_offset; 4211 struct xdr_stream *xdr = resp->xdr; 4212 int starting_len = xdr->buf->len; 4213 __be32 *p; 4214 4215 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 4216 if (!p) 4217 return nfserr_resource; 4218 4219 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ 4220 *p++ = cpu_to_be32(0); 4221 *p++ = cpu_to_be32(0); 4222 xdr->buf->head[0].iov_len = (char *)xdr->p - 4223 (char *)xdr->buf->head[0].iov_base; 4224 4225 /* 4226 * Number of bytes left for directory entries allowing for the 4227 * final 8 bytes of the readdir and a following failed op: 4228 */ 4229 bytes_left = xdr->buf->buflen - xdr->buf->len 4230 - COMPOUND_ERR_SLACK_SPACE - 8; 4231 if (bytes_left < 0) { 4232 nfserr = nfserr_resource; 4233 goto err_no_verf; 4234 } 4235 maxcount = svc_max_payload(resp->rqstp); 4236 maxcount = min_t(u32, readdir->rd_maxcount, maxcount); 4237 /* 4238 * Note the rfc defines rd_maxcount as the size of the 4239 * READDIR4resok structure, which includes the verifier above 4240 * and the 8 bytes encoded at the end of this function: 4241 */ 4242 if (maxcount < 16) { 4243 nfserr = nfserr_toosmall; 4244 goto err_no_verf; 4245 } 4246 maxcount = min_t(int, maxcount-16, bytes_left); 4247 4248 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */ 4249 if (!readdir->rd_dircount) 4250 readdir->rd_dircount = svc_max_payload(resp->rqstp); 4251 4252 readdir->xdr = xdr; 4253 readdir->rd_maxcount = maxcount; 4254 readdir->common.err = 0; 4255 readdir->cookie_offset = 0; 4256 4257 offset = readdir->rd_cookie; 4258 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, 4259 &offset, 4260 &readdir->common, nfsd4_encode_dirent); 4261 if (nfserr == nfs_ok && 4262 readdir->common.err == nfserr_toosmall && 4263 xdr->buf->len == starting_len + 8) { 4264 /* nothing encoded; which limit did we hit?: */ 4265 if (maxcount - 16 < bytes_left) 4266 /* It was the fault of rd_maxcount: */ 4267 nfserr = nfserr_toosmall; 4268 else 4269 /* We ran out of buffer space: */ 4270 nfserr = nfserr_resource; 4271 } 4272 if (nfserr) 4273 goto err_no_verf; 4274 4275 if (readdir->cookie_offset) { 4276 wire_offset = cpu_to_be64(offset); 4277 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, 4278 &wire_offset, 8); 4279 } 4280 4281 p = xdr_reserve_space(xdr, 8); 4282 if (!p) { 4283 WARN_ON_ONCE(1); 4284 goto err_no_verf; 4285 } 4286 *p++ = 0; /* no more entries */ 4287 *p++ = htonl(readdir->common.err == nfserr_eof); 4288 4289 return 0; 4290 err_no_verf: 4291 xdr_truncate_encode(xdr, starting_len); 4292 return nfserr; 4293 } 4294 4295 static __be32 4296 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, 4297 union nfsd4_op_u *u) 4298 { 4299 struct nfsd4_remove *remove = &u->remove; 4300 struct xdr_stream *xdr = resp->xdr; 4301 __be32 *p; 4302 4303 p = xdr_reserve_space(xdr, 20); 4304 if (!p) 4305 return nfserr_resource; 4306 p = encode_cinfo(p, &remove->rm_cinfo); 4307 return 0; 4308 } 4309 4310 static __be32 4311 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, 4312 union nfsd4_op_u *u) 4313 { 4314 struct nfsd4_rename *rename = &u->rename; 4315 struct xdr_stream *xdr = resp->xdr; 4316 __be32 *p; 4317 4318 p = xdr_reserve_space(xdr, 40); 4319 if (!p) 4320 return nfserr_resource; 4321 p = encode_cinfo(p, &rename->rn_sinfo); 4322 p = encode_cinfo(p, &rename->rn_tinfo); 4323 return 0; 4324 } 4325 4326 static __be32 4327 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp) 4328 { 4329 u32 i, nflavs, supported; 4330 struct exp_flavor_info *flavs; 4331 struct exp_flavor_info def_flavs[2]; 4332 __be32 *p, *flavorsp; 4333 static bool report = true; 4334 4335 if (exp->ex_nflavors) { 4336 flavs = exp->ex_flavors; 4337 nflavs = exp->ex_nflavors; 4338 } else { /* Handling of some defaults in absence of real secinfo: */ 4339 flavs = def_flavs; 4340 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { 4341 nflavs = 2; 4342 flavs[0].pseudoflavor = RPC_AUTH_UNIX; 4343 flavs[1].pseudoflavor = RPC_AUTH_NULL; 4344 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { 4345 nflavs = 1; 4346 flavs[0].pseudoflavor 4347 = svcauth_gss_flavor(exp->ex_client); 4348 } else { 4349 nflavs = 1; 4350 flavs[0].pseudoflavor 4351 = exp->ex_client->flavour->flavour; 4352 } 4353 } 4354 4355 supported = 0; 4356 p = xdr_reserve_space(xdr, 4); 4357 if (!p) 4358 return nfserr_resource; 4359 flavorsp = p++; /* to be backfilled later */ 4360 4361 for (i = 0; i < nflavs; i++) { 4362 rpc_authflavor_t pf = flavs[i].pseudoflavor; 4363 struct rpcsec_gss_info info; 4364 4365 if (rpcauth_get_gssinfo(pf, &info) == 0) { 4366 supported++; 4367 p = xdr_reserve_space(xdr, 4 + 4 + 4368 XDR_LEN(info.oid.len) + 4 + 4); 4369 if (!p) 4370 return nfserr_resource; 4371 *p++ = cpu_to_be32(RPC_AUTH_GSS); 4372 p = xdr_encode_opaque(p, info.oid.data, info.oid.len); 4373 *p++ = cpu_to_be32(info.qop); 4374 *p++ = cpu_to_be32(info.service); 4375 } else if (pf < RPC_AUTH_MAXFLAVOR) { 4376 supported++; 4377 p = xdr_reserve_space(xdr, 4); 4378 if (!p) 4379 return nfserr_resource; 4380 *p++ = cpu_to_be32(pf); 4381 } else { 4382 if (report) 4383 pr_warn("NFS: SECINFO: security flavor %u " 4384 "is not supported\n", pf); 4385 } 4386 } 4387 4388 if (nflavs != supported) 4389 report = false; 4390 *flavorsp = htonl(supported); 4391 return 0; 4392 } 4393 4394 static __be32 4395 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4396 union nfsd4_op_u *u) 4397 { 4398 struct nfsd4_secinfo *secinfo = &u->secinfo; 4399 struct xdr_stream *xdr = resp->xdr; 4400 4401 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp); 4402 } 4403 4404 static __be32 4405 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, 4406 union nfsd4_op_u *u) 4407 { 4408 struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name; 4409 struct xdr_stream *xdr = resp->xdr; 4410 4411 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp); 4412 } 4413 4414 /* 4415 * The SETATTR encode routine is special -- it always encodes a bitmap, 4416 * regardless of the error status. 4417 */ 4418 static __be32 4419 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, 4420 union nfsd4_op_u *u) 4421 { 4422 struct nfsd4_setattr *setattr = &u->setattr; 4423 struct xdr_stream *xdr = resp->xdr; 4424 __be32 *p; 4425 4426 p = xdr_reserve_space(xdr, 16); 4427 if (!p) 4428 return nfserr_resource; 4429 if (nfserr) { 4430 *p++ = cpu_to_be32(3); 4431 *p++ = cpu_to_be32(0); 4432 *p++ = cpu_to_be32(0); 4433 *p++ = cpu_to_be32(0); 4434 } 4435 else { 4436 *p++ = cpu_to_be32(3); 4437 *p++ = cpu_to_be32(setattr->sa_bmval[0]); 4438 *p++ = cpu_to_be32(setattr->sa_bmval[1]); 4439 *p++ = cpu_to_be32(setattr->sa_bmval[2]); 4440 } 4441 return nfserr; 4442 } 4443 4444 static __be32 4445 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, 4446 union nfsd4_op_u *u) 4447 { 4448 struct nfsd4_setclientid *scd = &u->setclientid; 4449 struct xdr_stream *xdr = resp->xdr; 4450 __be32 *p; 4451 4452 if (!nfserr) { 4453 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE); 4454 if (!p) 4455 return nfserr_resource; 4456 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8); 4457 p = xdr_encode_opaque_fixed(p, &scd->se_confirm, 4458 NFS4_VERIFIER_SIZE); 4459 } 4460 else if (nfserr == nfserr_clid_inuse) { 4461 p = xdr_reserve_space(xdr, 8); 4462 if (!p) 4463 return nfserr_resource; 4464 *p++ = cpu_to_be32(0); 4465 *p++ = cpu_to_be32(0); 4466 } 4467 return nfserr; 4468 } 4469 4470 static __be32 4471 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, 4472 union nfsd4_op_u *u) 4473 { 4474 struct nfsd4_write *write = &u->write; 4475 struct xdr_stream *xdr = resp->xdr; 4476 __be32 *p; 4477 4478 p = xdr_reserve_space(xdr, 16); 4479 if (!p) 4480 return nfserr_resource; 4481 *p++ = cpu_to_be32(write->wr_bytes_written); 4482 *p++ = cpu_to_be32(write->wr_how_written); 4483 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4484 NFS4_VERIFIER_SIZE); 4485 return 0; 4486 } 4487 4488 static __be32 4489 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, 4490 union nfsd4_op_u *u) 4491 { 4492 struct nfsd4_exchange_id *exid = &u->exchange_id; 4493 struct xdr_stream *xdr = resp->xdr; 4494 __be32 *p; 4495 char *major_id; 4496 char *server_scope; 4497 int major_id_sz; 4498 int server_scope_sz; 4499 uint64_t minor_id = 0; 4500 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id); 4501 4502 major_id = nn->nfsd_name; 4503 major_id_sz = strlen(nn->nfsd_name); 4504 server_scope = nn->nfsd_name; 4505 server_scope_sz = strlen(nn->nfsd_name); 4506 4507 p = xdr_reserve_space(xdr, 4508 8 /* eir_clientid */ + 4509 4 /* eir_sequenceid */ + 4510 4 /* eir_flags */ + 4511 4 /* spr_how */); 4512 if (!p) 4513 return nfserr_resource; 4514 4515 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8); 4516 *p++ = cpu_to_be32(exid->seqid); 4517 *p++ = cpu_to_be32(exid->flags); 4518 4519 *p++ = cpu_to_be32(exid->spa_how); 4520 4521 switch (exid->spa_how) { 4522 case SP4_NONE: 4523 break; 4524 case SP4_MACH_CRED: 4525 /* spo_must_enforce bitmap: */ 4526 nfserr = nfsd4_encode_bitmap(xdr, 4527 exid->spo_must_enforce[0], 4528 exid->spo_must_enforce[1], 4529 exid->spo_must_enforce[2]); 4530 if (nfserr) 4531 return nfserr; 4532 /* spo_must_allow bitmap: */ 4533 nfserr = nfsd4_encode_bitmap(xdr, 4534 exid->spo_must_allow[0], 4535 exid->spo_must_allow[1], 4536 exid->spo_must_allow[2]); 4537 if (nfserr) 4538 return nfserr; 4539 break; 4540 default: 4541 WARN_ON_ONCE(1); 4542 } 4543 4544 p = xdr_reserve_space(xdr, 4545 8 /* so_minor_id */ + 4546 4 /* so_major_id.len */ + 4547 (XDR_QUADLEN(major_id_sz) * 4) + 4548 4 /* eir_server_scope.len */ + 4549 (XDR_QUADLEN(server_scope_sz) * 4) + 4550 4 /* eir_server_impl_id.count (0) */); 4551 if (!p) 4552 return nfserr_resource; 4553 4554 /* The server_owner struct */ 4555 p = xdr_encode_hyper(p, minor_id); /* Minor id */ 4556 /* major id */ 4557 p = xdr_encode_opaque(p, major_id, major_id_sz); 4558 4559 /* Server scope */ 4560 p = xdr_encode_opaque(p, server_scope, server_scope_sz); 4561 4562 /* Implementation id */ 4563 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */ 4564 return 0; 4565 } 4566 4567 static __be32 4568 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, 4569 union nfsd4_op_u *u) 4570 { 4571 struct nfsd4_create_session *sess = &u->create_session; 4572 struct xdr_stream *xdr = resp->xdr; 4573 __be32 *p; 4574 4575 p = xdr_reserve_space(xdr, 24); 4576 if (!p) 4577 return nfserr_resource; 4578 p = xdr_encode_opaque_fixed(p, sess->sessionid.data, 4579 NFS4_MAX_SESSIONID_LEN); 4580 *p++ = cpu_to_be32(sess->seqid); 4581 *p++ = cpu_to_be32(sess->flags); 4582 4583 p = xdr_reserve_space(xdr, 28); 4584 if (!p) 4585 return nfserr_resource; 4586 *p++ = cpu_to_be32(0); /* headerpadsz */ 4587 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz); 4588 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz); 4589 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached); 4590 *p++ = cpu_to_be32(sess->fore_channel.maxops); 4591 *p++ = cpu_to_be32(sess->fore_channel.maxreqs); 4592 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs); 4593 4594 if (sess->fore_channel.nr_rdma_attrs) { 4595 p = xdr_reserve_space(xdr, 4); 4596 if (!p) 4597 return nfserr_resource; 4598 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs); 4599 } 4600 4601 p = xdr_reserve_space(xdr, 28); 4602 if (!p) 4603 return nfserr_resource; 4604 *p++ = cpu_to_be32(0); /* headerpadsz */ 4605 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz); 4606 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz); 4607 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached); 4608 *p++ = cpu_to_be32(sess->back_channel.maxops); 4609 *p++ = cpu_to_be32(sess->back_channel.maxreqs); 4610 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs); 4611 4612 if (sess->back_channel.nr_rdma_attrs) { 4613 p = xdr_reserve_space(xdr, 4); 4614 if (!p) 4615 return nfserr_resource; 4616 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs); 4617 } 4618 return 0; 4619 } 4620 4621 static __be32 4622 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, 4623 union nfsd4_op_u *u) 4624 { 4625 struct nfsd4_sequence *seq = &u->sequence; 4626 struct xdr_stream *xdr = resp->xdr; 4627 __be32 *p; 4628 4629 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20); 4630 if (!p) 4631 return nfserr_resource; 4632 p = xdr_encode_opaque_fixed(p, seq->sessionid.data, 4633 NFS4_MAX_SESSIONID_LEN); 4634 *p++ = cpu_to_be32(seq->seqid); 4635 *p++ = cpu_to_be32(seq->slotid); 4636 /* Note slotid's are numbered from zero: */ 4637 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */ 4638 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */ 4639 *p++ = cpu_to_be32(seq->status_flags); 4640 4641 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */ 4642 return 0; 4643 } 4644 4645 static __be32 4646 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, 4647 union nfsd4_op_u *u) 4648 { 4649 struct nfsd4_test_stateid *test_stateid = &u->test_stateid; 4650 struct xdr_stream *xdr = resp->xdr; 4651 struct nfsd4_test_stateid_id *stateid, *next; 4652 __be32 *p; 4653 4654 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids)); 4655 if (!p) 4656 return nfserr_resource; 4657 *p++ = htonl(test_stateid->ts_num_ids); 4658 4659 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) { 4660 *p++ = stateid->ts_id_status; 4661 } 4662 4663 return 0; 4664 } 4665 4666 #ifdef CONFIG_NFSD_PNFS 4667 static __be32 4668 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4669 union nfsd4_op_u *u) 4670 { 4671 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo; 4672 struct xdr_stream *xdr = resp->xdr; 4673 const struct nfsd4_layout_ops *ops; 4674 u32 starting_len = xdr->buf->len, needed_len; 4675 __be32 *p; 4676 4677 p = xdr_reserve_space(xdr, 4); 4678 if (!p) 4679 return nfserr_resource; 4680 4681 *p++ = cpu_to_be32(gdev->gd_layout_type); 4682 4683 /* If maxcount is 0 then just update notifications */ 4684 if (gdev->gd_maxcount != 0) { 4685 ops = nfsd4_layout_ops[gdev->gd_layout_type]; 4686 nfserr = ops->encode_getdeviceinfo(xdr, gdev); 4687 if (nfserr) { 4688 /* 4689 * We don't bother to burden the layout drivers with 4690 * enforcing gd_maxcount, just tell the client to 4691 * come back with a bigger buffer if it's not enough. 4692 */ 4693 if (xdr->buf->len + 4 > gdev->gd_maxcount) 4694 goto toosmall; 4695 return nfserr; 4696 } 4697 } 4698 4699 if (gdev->gd_notify_types) { 4700 p = xdr_reserve_space(xdr, 4 + 4); 4701 if (!p) 4702 return nfserr_resource; 4703 *p++ = cpu_to_be32(1); /* bitmap length */ 4704 *p++ = cpu_to_be32(gdev->gd_notify_types); 4705 } else { 4706 p = xdr_reserve_space(xdr, 4); 4707 if (!p) 4708 return nfserr_resource; 4709 *p++ = 0; 4710 } 4711 4712 return 0; 4713 toosmall: 4714 dprintk("%s: maxcount too small\n", __func__); 4715 needed_len = xdr->buf->len + 4 /* notifications */; 4716 xdr_truncate_encode(xdr, starting_len); 4717 p = xdr_reserve_space(xdr, 4); 4718 if (!p) 4719 return nfserr_resource; 4720 *p++ = cpu_to_be32(needed_len); 4721 return nfserr_toosmall; 4722 } 4723 4724 static __be32 4725 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, 4726 union nfsd4_op_u *u) 4727 { 4728 struct nfsd4_layoutget *lgp = &u->layoutget; 4729 struct xdr_stream *xdr = resp->xdr; 4730 const struct nfsd4_layout_ops *ops; 4731 __be32 *p; 4732 4733 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t)); 4734 if (!p) 4735 return nfserr_resource; 4736 4737 *p++ = cpu_to_be32(1); /* we always set return-on-close */ 4738 *p++ = cpu_to_be32(lgp->lg_sid.si_generation); 4739 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque, 4740 sizeof(stateid_opaque_t)); 4741 4742 *p++ = cpu_to_be32(1); /* we always return a single layout */ 4743 p = xdr_encode_hyper(p, lgp->lg_seg.offset); 4744 p = xdr_encode_hyper(p, lgp->lg_seg.length); 4745 *p++ = cpu_to_be32(lgp->lg_seg.iomode); 4746 *p++ = cpu_to_be32(lgp->lg_layout_type); 4747 4748 ops = nfsd4_layout_ops[lgp->lg_layout_type]; 4749 return ops->encode_layoutget(xdr, lgp); 4750 } 4751 4752 static __be32 4753 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, 4754 union nfsd4_op_u *u) 4755 { 4756 struct nfsd4_layoutcommit *lcp = &u->layoutcommit; 4757 struct xdr_stream *xdr = resp->xdr; 4758 __be32 *p; 4759 4760 p = xdr_reserve_space(xdr, 4); 4761 if (!p) 4762 return nfserr_resource; 4763 *p++ = cpu_to_be32(lcp->lc_size_chg); 4764 if (lcp->lc_size_chg) { 4765 p = xdr_reserve_space(xdr, 8); 4766 if (!p) 4767 return nfserr_resource; 4768 p = xdr_encode_hyper(p, lcp->lc_newsize); 4769 } 4770 4771 return 0; 4772 } 4773 4774 static __be32 4775 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr, 4776 union nfsd4_op_u *u) 4777 { 4778 struct nfsd4_layoutreturn *lrp = &u->layoutreturn; 4779 struct xdr_stream *xdr = resp->xdr; 4780 __be32 *p; 4781 4782 p = xdr_reserve_space(xdr, 4); 4783 if (!p) 4784 return nfserr_resource; 4785 *p++ = cpu_to_be32(lrp->lrs_present); 4786 if (lrp->lrs_present) 4787 return nfsd4_encode_stateid(xdr, &lrp->lr_sid); 4788 return 0; 4789 } 4790 #endif /* CONFIG_NFSD_PNFS */ 4791 4792 static __be32 4793 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, 4794 struct nfsd42_write_res *write, bool sync) 4795 { 4796 __be32 *p; 4797 p = xdr_reserve_space(resp->xdr, 4); 4798 if (!p) 4799 return nfserr_resource; 4800 4801 if (sync) 4802 *p++ = cpu_to_be32(0); 4803 else { 4804 __be32 nfserr; 4805 *p++ = cpu_to_be32(1); 4806 nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid); 4807 if (nfserr) 4808 return nfserr; 4809 } 4810 p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE); 4811 if (!p) 4812 return nfserr_resource; 4813 4814 p = xdr_encode_hyper(p, write->wr_bytes_written); 4815 *p++ = cpu_to_be32(write->wr_stable_how); 4816 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4817 NFS4_VERIFIER_SIZE); 4818 return nfs_ok; 4819 } 4820 4821 static __be32 4822 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns) 4823 { 4824 struct xdr_stream *xdr = resp->xdr; 4825 struct nfs42_netaddr *addr; 4826 __be32 *p; 4827 4828 p = xdr_reserve_space(xdr, 4); 4829 *p++ = cpu_to_be32(ns->nl4_type); 4830 4831 switch (ns->nl4_type) { 4832 case NL4_NETADDR: 4833 addr = &ns->u.nl4_addr; 4834 4835 /* netid_len, netid, uaddr_len, uaddr (port included 4836 * in RPCBIND_MAXUADDRLEN) 4837 */ 4838 p = xdr_reserve_space(xdr, 4839 4 /* netid len */ + 4840 (XDR_QUADLEN(addr->netid_len) * 4) + 4841 4 /* uaddr len */ + 4842 (XDR_QUADLEN(addr->addr_len) * 4)); 4843 if (!p) 4844 return nfserr_resource; 4845 4846 *p++ = cpu_to_be32(addr->netid_len); 4847 p = xdr_encode_opaque_fixed(p, addr->netid, 4848 addr->netid_len); 4849 *p++ = cpu_to_be32(addr->addr_len); 4850 p = xdr_encode_opaque_fixed(p, addr->addr, 4851 addr->addr_len); 4852 break; 4853 default: 4854 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR); 4855 return nfserr_inval; 4856 } 4857 4858 return 0; 4859 } 4860 4861 static __be32 4862 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr, 4863 union nfsd4_op_u *u) 4864 { 4865 struct nfsd4_copy *copy = &u->copy; 4866 __be32 *p; 4867 4868 nfserr = nfsd42_encode_write_res(resp, ©->cp_res, 4869 nfsd4_copy_is_sync(copy)); 4870 if (nfserr) 4871 return nfserr; 4872 4873 p = xdr_reserve_space(resp->xdr, 4 + 4); 4874 *p++ = xdr_one; /* cr_consecutive */ 4875 *p = nfsd4_copy_is_sync(copy) ? xdr_one : xdr_zero; 4876 return 0; 4877 } 4878 4879 static __be32 4880 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr, 4881 union nfsd4_op_u *u) 4882 { 4883 struct nfsd4_offload_status *os = &u->offload_status; 4884 struct xdr_stream *xdr = resp->xdr; 4885 __be32 *p; 4886 4887 p = xdr_reserve_space(xdr, 8 + 4); 4888 if (!p) 4889 return nfserr_resource; 4890 p = xdr_encode_hyper(p, os->count); 4891 *p++ = cpu_to_be32(0); 4892 return nfserr; 4893 } 4894 4895 static __be32 4896 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp, 4897 struct nfsd4_read *read) 4898 { 4899 bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags); 4900 struct file *file = read->rd_nf->nf_file; 4901 struct xdr_stream *xdr = resp->xdr; 4902 unsigned long maxcount; 4903 __be32 nfserr, *p; 4904 4905 /* Content type, offset, byte count */ 4906 p = xdr_reserve_space(xdr, 4 + 8 + 4); 4907 if (!p) 4908 return nfserr_io; 4909 if (resp->xdr->buf->page_len && splice_ok) { 4910 WARN_ON_ONCE(splice_ok); 4911 return nfserr_serverfault; 4912 } 4913 4914 maxcount = min_t(unsigned long, read->rd_length, 4915 (xdr->buf->buflen - xdr->buf->len)); 4916 4917 if (file->f_op->splice_read && splice_ok) 4918 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 4919 else 4920 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 4921 if (nfserr) 4922 return nfserr; 4923 4924 *p++ = cpu_to_be32(NFS4_CONTENT_DATA); 4925 p = xdr_encode_hyper(p, read->rd_offset); 4926 *p = cpu_to_be32(read->rd_length); 4927 4928 return nfs_ok; 4929 } 4930 4931 static __be32 4932 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr, 4933 union nfsd4_op_u *u) 4934 { 4935 struct nfsd4_read *read = &u->read; 4936 struct file *file = read->rd_nf->nf_file; 4937 struct xdr_stream *xdr = resp->xdr; 4938 int starting_len = xdr->buf->len; 4939 u32 segments = 0; 4940 __be32 *p; 4941 4942 if (nfserr) 4943 return nfserr; 4944 4945 /* eof flag, segment count */ 4946 p = xdr_reserve_space(xdr, 4 + 4); 4947 if (!p) 4948 return nfserr_io; 4949 xdr_commit_encode(xdr); 4950 4951 read->rd_eof = read->rd_offset >= i_size_read(file_inode(file)); 4952 if (read->rd_eof) 4953 goto out; 4954 4955 nfserr = nfsd4_encode_read_plus_data(resp, read); 4956 if (nfserr) { 4957 xdr_truncate_encode(xdr, starting_len); 4958 return nfserr; 4959 } 4960 4961 segments++; 4962 4963 out: 4964 p = xdr_encode_bool(p, read->rd_eof); 4965 *p = cpu_to_be32(segments); 4966 return nfserr; 4967 } 4968 4969 static __be32 4970 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr, 4971 union nfsd4_op_u *u) 4972 { 4973 struct nfsd4_copy_notify *cn = &u->copy_notify; 4974 struct xdr_stream *xdr = resp->xdr; 4975 __be32 *p; 4976 4977 if (nfserr) 4978 return nfserr; 4979 4980 /* 8 sec, 4 nsec */ 4981 p = xdr_reserve_space(xdr, 12); 4982 if (!p) 4983 return nfserr_resource; 4984 4985 /* cnr_lease_time */ 4986 p = xdr_encode_hyper(p, cn->cpn_sec); 4987 *p++ = cpu_to_be32(cn->cpn_nsec); 4988 4989 /* cnr_stateid */ 4990 nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid); 4991 if (nfserr) 4992 return nfserr; 4993 4994 /* cnr_src.nl_nsvr */ 4995 p = xdr_reserve_space(xdr, 4); 4996 if (!p) 4997 return nfserr_resource; 4998 4999 *p++ = cpu_to_be32(1); 5000 5001 nfserr = nfsd42_encode_nl4_server(resp, cn->cpn_src); 5002 return nfserr; 5003 } 5004 5005 static __be32 5006 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, 5007 union nfsd4_op_u *u) 5008 { 5009 struct nfsd4_seek *seek = &u->seek; 5010 __be32 *p; 5011 5012 p = xdr_reserve_space(resp->xdr, 4 + 8); 5013 *p++ = cpu_to_be32(seek->seek_eof); 5014 p = xdr_encode_hyper(p, seek->seek_pos); 5015 5016 return 0; 5017 } 5018 5019 static __be32 5020 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, 5021 union nfsd4_op_u *p) 5022 { 5023 return nfserr; 5024 } 5025 5026 /* 5027 * Encode kmalloc-ed buffer in to XDR stream. 5028 */ 5029 static __be32 5030 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen) 5031 { 5032 u32 cplen; 5033 __be32 *p; 5034 5035 cplen = min_t(unsigned long, buflen, 5036 ((void *)xdr->end - (void *)xdr->p)); 5037 p = xdr_reserve_space(xdr, cplen); 5038 if (!p) 5039 return nfserr_resource; 5040 5041 memcpy(p, buf, cplen); 5042 buf += cplen; 5043 buflen -= cplen; 5044 5045 while (buflen) { 5046 cplen = min_t(u32, buflen, PAGE_SIZE); 5047 p = xdr_reserve_space(xdr, cplen); 5048 if (!p) 5049 return nfserr_resource; 5050 5051 memcpy(p, buf, cplen); 5052 5053 if (cplen < PAGE_SIZE) { 5054 /* 5055 * We're done, with a length that wasn't page 5056 * aligned, so possibly not word aligned. Pad 5057 * any trailing bytes with 0. 5058 */ 5059 xdr_encode_opaque_fixed(p, NULL, cplen); 5060 break; 5061 } 5062 5063 buflen -= PAGE_SIZE; 5064 buf += PAGE_SIZE; 5065 } 5066 5067 return 0; 5068 } 5069 5070 static __be32 5071 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5072 union nfsd4_op_u *u) 5073 { 5074 struct nfsd4_getxattr *getxattr = &u->getxattr; 5075 struct xdr_stream *xdr = resp->xdr; 5076 __be32 *p, err; 5077 5078 p = xdr_reserve_space(xdr, 4); 5079 if (!p) 5080 return nfserr_resource; 5081 5082 *p = cpu_to_be32(getxattr->getxa_len); 5083 5084 if (getxattr->getxa_len == 0) 5085 return 0; 5086 5087 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf, 5088 getxattr->getxa_len); 5089 5090 kvfree(getxattr->getxa_buf); 5091 5092 return err; 5093 } 5094 5095 static __be32 5096 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5097 union nfsd4_op_u *u) 5098 { 5099 struct nfsd4_setxattr *setxattr = &u->setxattr; 5100 struct xdr_stream *xdr = resp->xdr; 5101 __be32 *p; 5102 5103 p = xdr_reserve_space(xdr, 20); 5104 if (!p) 5105 return nfserr_resource; 5106 5107 encode_cinfo(p, &setxattr->setxa_cinfo); 5108 5109 return 0; 5110 } 5111 5112 /* 5113 * See if there are cookie values that can be rejected outright. 5114 */ 5115 static __be32 5116 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs, 5117 u32 *offsetp) 5118 { 5119 u64 cookie = listxattrs->lsxa_cookie; 5120 5121 /* 5122 * If the cookie is larger than the maximum number we can fit 5123 * in either the buffer we just got back from vfs_listxattr, or, 5124 * XDR-encoded, in the return buffer, it's invalid. 5125 */ 5126 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2)) 5127 return nfserr_badcookie; 5128 5129 if (cookie > (listxattrs->lsxa_maxcount / 5130 (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4))) 5131 return nfserr_badcookie; 5132 5133 *offsetp = (u32)cookie; 5134 return 0; 5135 } 5136 5137 static __be32 5138 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr, 5139 union nfsd4_op_u *u) 5140 { 5141 struct nfsd4_listxattrs *listxattrs = &u->listxattrs; 5142 struct xdr_stream *xdr = resp->xdr; 5143 u32 cookie_offset, count_offset, eof; 5144 u32 left, xdrleft, slen, count; 5145 u32 xdrlen, offset; 5146 u64 cookie; 5147 char *sp; 5148 __be32 status, tmp; 5149 __be32 *p; 5150 u32 nuser; 5151 5152 eof = 1; 5153 5154 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset); 5155 if (status) 5156 goto out; 5157 5158 /* 5159 * Reserve space for the cookie and the name array count. Record 5160 * the offsets to save them later. 5161 */ 5162 cookie_offset = xdr->buf->len; 5163 count_offset = cookie_offset + 8; 5164 p = xdr_reserve_space(xdr, 12); 5165 if (!p) { 5166 status = nfserr_resource; 5167 goto out; 5168 } 5169 5170 count = 0; 5171 left = listxattrs->lsxa_len; 5172 sp = listxattrs->lsxa_buf; 5173 nuser = 0; 5174 5175 xdrleft = listxattrs->lsxa_maxcount; 5176 5177 while (left > 0 && xdrleft > 0) { 5178 slen = strlen(sp); 5179 5180 /* 5181 * Check if this is a "user." attribute, skip it if not. 5182 */ 5183 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) 5184 goto contloop; 5185 5186 slen -= XATTR_USER_PREFIX_LEN; 5187 xdrlen = 4 + ((slen + 3) & ~3); 5188 if (xdrlen > xdrleft) { 5189 if (count == 0) { 5190 /* 5191 * Can't even fit the first attribute name. 5192 */ 5193 status = nfserr_toosmall; 5194 goto out; 5195 } 5196 eof = 0; 5197 goto wreof; 5198 } 5199 5200 left -= XATTR_USER_PREFIX_LEN; 5201 sp += XATTR_USER_PREFIX_LEN; 5202 if (nuser++ < offset) 5203 goto contloop; 5204 5205 5206 p = xdr_reserve_space(xdr, xdrlen); 5207 if (!p) { 5208 status = nfserr_resource; 5209 goto out; 5210 } 5211 5212 xdr_encode_opaque(p, sp, slen); 5213 5214 xdrleft -= xdrlen; 5215 count++; 5216 contloop: 5217 sp += slen + 1; 5218 left -= slen + 1; 5219 } 5220 5221 /* 5222 * If there were user attributes to copy, but we didn't copy 5223 * any, the offset was too large (e.g. the cookie was invalid). 5224 */ 5225 if (nuser > 0 && count == 0) { 5226 status = nfserr_badcookie; 5227 goto out; 5228 } 5229 5230 wreof: 5231 p = xdr_reserve_space(xdr, 4); 5232 if (!p) { 5233 status = nfserr_resource; 5234 goto out; 5235 } 5236 *p = cpu_to_be32(eof); 5237 5238 cookie = offset + count; 5239 5240 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8); 5241 tmp = cpu_to_be32(count); 5242 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4); 5243 out: 5244 if (listxattrs->lsxa_len) 5245 kvfree(listxattrs->lsxa_buf); 5246 return status; 5247 } 5248 5249 static __be32 5250 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5251 union nfsd4_op_u *u) 5252 { 5253 struct nfsd4_removexattr *removexattr = &u->removexattr; 5254 struct xdr_stream *xdr = resp->xdr; 5255 __be32 *p; 5256 5257 p = xdr_reserve_space(xdr, 20); 5258 if (!p) 5259 return nfserr_resource; 5260 5261 p = encode_cinfo(p, &removexattr->rmxa_cinfo); 5262 return 0; 5263 } 5264 5265 typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u); 5266 5267 /* 5268 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1 5269 * since we don't need to filter out obsolete ops as this is 5270 * done in the decoding phase. 5271 */ 5272 static const nfsd4_enc nfsd4_enc_ops[] = { 5273 [OP_ACCESS] = nfsd4_encode_access, 5274 [OP_CLOSE] = nfsd4_encode_close, 5275 [OP_COMMIT] = nfsd4_encode_commit, 5276 [OP_CREATE] = nfsd4_encode_create, 5277 [OP_DELEGPURGE] = nfsd4_encode_noop, 5278 [OP_DELEGRETURN] = nfsd4_encode_noop, 5279 [OP_GETATTR] = nfsd4_encode_getattr, 5280 [OP_GETFH] = nfsd4_encode_getfh, 5281 [OP_LINK] = nfsd4_encode_link, 5282 [OP_LOCK] = nfsd4_encode_lock, 5283 [OP_LOCKT] = nfsd4_encode_lockt, 5284 [OP_LOCKU] = nfsd4_encode_locku, 5285 [OP_LOOKUP] = nfsd4_encode_noop, 5286 [OP_LOOKUPP] = nfsd4_encode_noop, 5287 [OP_NVERIFY] = nfsd4_encode_noop, 5288 [OP_OPEN] = nfsd4_encode_open, 5289 [OP_OPENATTR] = nfsd4_encode_noop, 5290 [OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm, 5291 [OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade, 5292 [OP_PUTFH] = nfsd4_encode_noop, 5293 [OP_PUTPUBFH] = nfsd4_encode_noop, 5294 [OP_PUTROOTFH] = nfsd4_encode_noop, 5295 [OP_READ] = nfsd4_encode_read, 5296 [OP_READDIR] = nfsd4_encode_readdir, 5297 [OP_READLINK] = nfsd4_encode_readlink, 5298 [OP_REMOVE] = nfsd4_encode_remove, 5299 [OP_RENAME] = nfsd4_encode_rename, 5300 [OP_RENEW] = nfsd4_encode_noop, 5301 [OP_RESTOREFH] = nfsd4_encode_noop, 5302 [OP_SAVEFH] = nfsd4_encode_noop, 5303 [OP_SECINFO] = nfsd4_encode_secinfo, 5304 [OP_SETATTR] = nfsd4_encode_setattr, 5305 [OP_SETCLIENTID] = nfsd4_encode_setclientid, 5306 [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop, 5307 [OP_VERIFY] = nfsd4_encode_noop, 5308 [OP_WRITE] = nfsd4_encode_write, 5309 [OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop, 5310 5311 /* NFSv4.1 operations */ 5312 [OP_BACKCHANNEL_CTL] = nfsd4_encode_noop, 5313 [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session, 5314 [OP_EXCHANGE_ID] = nfsd4_encode_exchange_id, 5315 [OP_CREATE_SESSION] = nfsd4_encode_create_session, 5316 [OP_DESTROY_SESSION] = nfsd4_encode_noop, 5317 [OP_FREE_STATEID] = nfsd4_encode_noop, 5318 [OP_GET_DIR_DELEGATION] = nfsd4_encode_noop, 5319 #ifdef CONFIG_NFSD_PNFS 5320 [OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo, 5321 [OP_GETDEVICELIST] = nfsd4_encode_noop, 5322 [OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit, 5323 [OP_LAYOUTGET] = nfsd4_encode_layoutget, 5324 [OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn, 5325 #else 5326 [OP_GETDEVICEINFO] = nfsd4_encode_noop, 5327 [OP_GETDEVICELIST] = nfsd4_encode_noop, 5328 [OP_LAYOUTCOMMIT] = nfsd4_encode_noop, 5329 [OP_LAYOUTGET] = nfsd4_encode_noop, 5330 [OP_LAYOUTRETURN] = nfsd4_encode_noop, 5331 #endif 5332 [OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name, 5333 [OP_SEQUENCE] = nfsd4_encode_sequence, 5334 [OP_SET_SSV] = nfsd4_encode_noop, 5335 [OP_TEST_STATEID] = nfsd4_encode_test_stateid, 5336 [OP_WANT_DELEGATION] = nfsd4_encode_noop, 5337 [OP_DESTROY_CLIENTID] = nfsd4_encode_noop, 5338 [OP_RECLAIM_COMPLETE] = nfsd4_encode_noop, 5339 5340 /* NFSv4.2 operations */ 5341 [OP_ALLOCATE] = nfsd4_encode_noop, 5342 [OP_COPY] = nfsd4_encode_copy, 5343 [OP_COPY_NOTIFY] = nfsd4_encode_copy_notify, 5344 [OP_DEALLOCATE] = nfsd4_encode_noop, 5345 [OP_IO_ADVISE] = nfsd4_encode_noop, 5346 [OP_LAYOUTERROR] = nfsd4_encode_noop, 5347 [OP_LAYOUTSTATS] = nfsd4_encode_noop, 5348 [OP_OFFLOAD_CANCEL] = nfsd4_encode_noop, 5349 [OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status, 5350 [OP_READ_PLUS] = nfsd4_encode_read_plus, 5351 [OP_SEEK] = nfsd4_encode_seek, 5352 [OP_WRITE_SAME] = nfsd4_encode_noop, 5353 [OP_CLONE] = nfsd4_encode_noop, 5354 5355 /* RFC 8276 extended atributes operations */ 5356 [OP_GETXATTR] = nfsd4_encode_getxattr, 5357 [OP_SETXATTR] = nfsd4_encode_setxattr, 5358 [OP_LISTXATTRS] = nfsd4_encode_listxattrs, 5359 [OP_REMOVEXATTR] = nfsd4_encode_removexattr, 5360 }; 5361 5362 /* 5363 * Calculate whether we still have space to encode repsize bytes. 5364 * There are two considerations: 5365 * - For NFS versions >=4.1, the size of the reply must stay within 5366 * session limits 5367 * - For all NFS versions, we must stay within limited preallocated 5368 * buffer space. 5369 * 5370 * This is called before the operation is processed, so can only provide 5371 * an upper estimate. For some nonidempotent operations (such as 5372 * getattr), it's not necessarily a problem if that estimate is wrong, 5373 * as we can fail it after processing without significant side effects. 5374 */ 5375 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize) 5376 { 5377 struct xdr_buf *buf = &resp->rqstp->rq_res; 5378 struct nfsd4_slot *slot = resp->cstate.slot; 5379 5380 if (buf->len + respsize <= buf->buflen) 5381 return nfs_ok; 5382 if (!nfsd4_has_session(&resp->cstate)) 5383 return nfserr_resource; 5384 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) { 5385 WARN_ON_ONCE(1); 5386 return nfserr_rep_too_big_to_cache; 5387 } 5388 return nfserr_rep_too_big; 5389 } 5390 5391 void 5392 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 5393 { 5394 struct xdr_stream *xdr = resp->xdr; 5395 struct nfs4_stateowner *so = resp->cstate.replay_owner; 5396 struct svc_rqst *rqstp = resp->rqstp; 5397 const struct nfsd4_operation *opdesc = op->opdesc; 5398 int post_err_offset; 5399 nfsd4_enc encoder; 5400 __be32 *p; 5401 5402 p = xdr_reserve_space(xdr, 8); 5403 if (!p) { 5404 WARN_ON_ONCE(1); 5405 return; 5406 } 5407 *p++ = cpu_to_be32(op->opnum); 5408 post_err_offset = xdr->buf->len; 5409 5410 if (op->opnum == OP_ILLEGAL) 5411 goto status; 5412 if (op->status && opdesc && 5413 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE)) 5414 goto status; 5415 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || 5416 !nfsd4_enc_ops[op->opnum]); 5417 encoder = nfsd4_enc_ops[op->opnum]; 5418 op->status = encoder(resp, op->status, &op->u); 5419 if (op->status) 5420 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status); 5421 if (opdesc && opdesc->op_release) 5422 opdesc->op_release(&op->u); 5423 xdr_commit_encode(xdr); 5424 5425 /* nfsd4_check_resp_size guarantees enough room for error status */ 5426 if (!op->status) { 5427 int space_needed = 0; 5428 if (!nfsd4_last_compound_op(rqstp)) 5429 space_needed = COMPOUND_ERR_SLACK_SPACE; 5430 op->status = nfsd4_check_resp_size(resp, space_needed); 5431 } 5432 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) { 5433 struct nfsd4_slot *slot = resp->cstate.slot; 5434 5435 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) 5436 op->status = nfserr_rep_too_big_to_cache; 5437 else 5438 op->status = nfserr_rep_too_big; 5439 } 5440 if (op->status == nfserr_resource || 5441 op->status == nfserr_rep_too_big || 5442 op->status == nfserr_rep_too_big_to_cache) { 5443 /* 5444 * The operation may have already been encoded or 5445 * partially encoded. No op returns anything additional 5446 * in the case of one of these three errors, so we can 5447 * just truncate back to after the status. But it's a 5448 * bug if we had to do this on a non-idempotent op: 5449 */ 5450 warn_on_nonidempotent_op(op); 5451 xdr_truncate_encode(xdr, post_err_offset); 5452 } 5453 if (so) { 5454 int len = xdr->buf->len - post_err_offset; 5455 5456 so->so_replay.rp_status = op->status; 5457 so->so_replay.rp_buflen = len; 5458 read_bytes_from_xdr_buf(xdr->buf, post_err_offset, 5459 so->so_replay.rp_buf, len); 5460 } 5461 status: 5462 *p = op->status; 5463 } 5464 5465 /* 5466 * Encode the reply stored in the stateowner reply cache 5467 * 5468 * XDR note: do not encode rp->rp_buflen: the buffer contains the 5469 * previously sent already encoded operation. 5470 */ 5471 void 5472 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op) 5473 { 5474 __be32 *p; 5475 struct nfs4_replay *rp = op->replay; 5476 5477 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen); 5478 if (!p) { 5479 WARN_ON_ONCE(1); 5480 return; 5481 } 5482 *p++ = cpu_to_be32(op->opnum); 5483 *p++ = rp->rp_status; /* already xdr'ed */ 5484 5485 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen); 5486 } 5487 5488 void nfsd4_release_compoundargs(struct svc_rqst *rqstp) 5489 { 5490 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5491 5492 if (args->ops != args->iops) { 5493 vfree(args->ops); 5494 args->ops = args->iops; 5495 } 5496 while (args->to_free) { 5497 struct svcxdr_tmpbuf *tb = args->to_free; 5498 args->to_free = tb->next; 5499 kfree(tb); 5500 } 5501 } 5502 5503 bool 5504 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5505 { 5506 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5507 5508 /* svcxdr_tmp_alloc */ 5509 args->to_free = NULL; 5510 5511 args->xdr = xdr; 5512 args->ops = args->iops; 5513 args->rqstp = rqstp; 5514 5515 return nfsd4_decode_compound(args); 5516 } 5517 5518 bool 5519 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5520 { 5521 struct nfsd4_compoundres *resp = rqstp->rq_resp; 5522 __be32 *p; 5523 5524 /* 5525 * Send buffer space for the following items is reserved 5526 * at the top of nfsd4_proc_compound(). 5527 */ 5528 p = resp->statusp; 5529 5530 *p++ = resp->cstate.status; 5531 5532 rqstp->rq_next_page = xdr->page_ptr + 1; 5533 5534 *p++ = htonl(resp->taglen); 5535 memcpy(p, resp->tag, resp->taglen); 5536 p += XDR_QUADLEN(resp->taglen); 5537 *p++ = htonl(resp->opcnt); 5538 5539 nfsd4_sequence_done(resp); 5540 return true; 5541 } 5542