1 /* 2 * Server-side XDR for NFSv4 3 * 4 * Copyright (c) 2002 The Regents of the University of Michigan. 5 * All rights reserved. 6 * 7 * Kendrick Smith <kmsmith@umich.edu> 8 * Andy Adamson <andros@umich.edu> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <linux/file.h> 37 #include <linux/slab.h> 38 #include <linux/namei.h> 39 #include <linux/statfs.h> 40 #include <linux/utsname.h> 41 #include <linux/pagemap.h> 42 #include <linux/sunrpc/svcauth_gss.h> 43 #include <linux/sunrpc/addr.h> 44 #include <linux/xattr.h> 45 #include <uapi/linux/xattr.h> 46 47 #include "idmap.h" 48 #include "acl.h" 49 #include "xdr4.h" 50 #include "vfs.h" 51 #include "state.h" 52 #include "cache.h" 53 #include "netns.h" 54 #include "pnfs.h" 55 #include "filecache.h" 56 57 #include "trace.h" 58 59 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 60 #include <linux/security.h> 61 #endif 62 63 64 #define NFSDDBG_FACILITY NFSDDBG_XDR 65 66 const u32 nfsd_suppattrs[3][3] = { 67 {NFSD4_SUPPORTED_ATTRS_WORD0, 68 NFSD4_SUPPORTED_ATTRS_WORD1, 69 NFSD4_SUPPORTED_ATTRS_WORD2}, 70 71 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 72 NFSD4_1_SUPPORTED_ATTRS_WORD1, 73 NFSD4_1_SUPPORTED_ATTRS_WORD2}, 74 75 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 76 NFSD4_1_SUPPORTED_ATTRS_WORD1, 77 NFSD4_2_SUPPORTED_ATTRS_WORD2}, 78 }; 79 80 /* 81 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing 82 * directory in order to indicate to the client that a filesystem boundary is present 83 * We use a fixed fsid for a referral 84 */ 85 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL 86 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL 87 88 static __be32 89 check_filename(char *str, int len) 90 { 91 int i; 92 93 if (len == 0) 94 return nfserr_inval; 95 if (len > NFS4_MAXNAMLEN) 96 return nfserr_nametoolong; 97 if (isdotent(str, len)) 98 return nfserr_badname; 99 for (i = 0; i < len; i++) 100 if (str[i] == '/') 101 return nfserr_badname; 102 return 0; 103 } 104 105 static int zero_clientid(clientid_t *clid) 106 { 107 return (clid->cl_boot == 0) && (clid->cl_id == 0); 108 } 109 110 /** 111 * svcxdr_tmpalloc - allocate memory to be freed after compound processing 112 * @argp: NFSv4 compound argument structure 113 * @len: length of buffer to allocate 114 * 115 * Allocates a buffer of size @len to be freed when processing the compound 116 * operation described in @argp finishes. 117 */ 118 static void * 119 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len) 120 { 121 struct svcxdr_tmpbuf *tb; 122 123 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL); 124 if (!tb) 125 return NULL; 126 tb->next = argp->to_free; 127 argp->to_free = tb; 128 return tb->buf; 129 } 130 131 /* 132 * For xdr strings that need to be passed to other kernel api's 133 * as null-terminated strings. 134 * 135 * Note null-terminating in place usually isn't safe since the 136 * buffer might end on a page boundary. 137 */ 138 static char * 139 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len) 140 { 141 char *p = svcxdr_tmpalloc(argp, len + 1); 142 143 if (!p) 144 return NULL; 145 memcpy(p, buf, len); 146 p[len] = '\0'; 147 return p; 148 } 149 150 static void * 151 svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, u32 len) 152 { 153 __be32 *tmp; 154 155 /* 156 * The location of the decoded data item is stable, 157 * so @p is OK to use. This is the common case. 158 */ 159 if (p != argp->xdr->scratch.iov_base) 160 return p; 161 162 tmp = svcxdr_tmpalloc(argp, len); 163 if (!tmp) 164 return NULL; 165 memcpy(tmp, p, len); 166 return tmp; 167 } 168 169 /* 170 * NFSv4 basic data type decoders 171 */ 172 173 /* 174 * This helper handles variable-length opaques which belong to protocol 175 * elements that this implementation does not support. 176 */ 177 static __be32 178 nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen) 179 { 180 u32 len; 181 182 if (xdr_stream_decode_u32(argp->xdr, &len) < 0) 183 return nfserr_bad_xdr; 184 if (maxlen && len > maxlen) 185 return nfserr_bad_xdr; 186 if (!xdr_inline_decode(argp->xdr, len)) 187 return nfserr_bad_xdr; 188 189 return nfs_ok; 190 } 191 192 static __be32 193 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o) 194 { 195 __be32 *p; 196 u32 len; 197 198 if (xdr_stream_decode_u32(argp->xdr, &len) < 0) 199 return nfserr_bad_xdr; 200 if (len == 0 || len > NFS4_OPAQUE_LIMIT) 201 return nfserr_bad_xdr; 202 p = xdr_inline_decode(argp->xdr, len); 203 if (!p) 204 return nfserr_bad_xdr; 205 o->data = svcxdr_savemem(argp, p, len); 206 if (!o->data) 207 return nfserr_jukebox; 208 o->len = len; 209 210 return nfs_ok; 211 } 212 213 static __be32 214 nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp) 215 { 216 __be32 *p, status; 217 218 if (xdr_stream_decode_u32(argp->xdr, lenp) < 0) 219 return nfserr_bad_xdr; 220 p = xdr_inline_decode(argp->xdr, *lenp); 221 if (!p) 222 return nfserr_bad_xdr; 223 status = check_filename((char *)p, *lenp); 224 if (status) 225 return status; 226 *namp = svcxdr_savemem(argp, p, *lenp); 227 if (!*namp) 228 return nfserr_jukebox; 229 230 return nfs_ok; 231 } 232 233 static __be32 234 nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv) 235 { 236 __be32 *p; 237 238 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3); 239 if (!p) 240 return nfserr_bad_xdr; 241 p = xdr_decode_hyper(p, &tv->tv_sec); 242 tv->tv_nsec = be32_to_cpup(p++); 243 if (tv->tv_nsec >= (u32)1000000000) 244 return nfserr_inval; 245 return nfs_ok; 246 } 247 248 static __be32 249 nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf) 250 { 251 __be32 *p; 252 253 p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE); 254 if (!p) 255 return nfserr_bad_xdr; 256 memcpy(verf->data, p, sizeof(verf->data)); 257 return nfs_ok; 258 } 259 260 /** 261 * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4 262 * @argp: NFSv4 compound argument structure 263 * @bmval: pointer to an array of u32's to decode into 264 * @bmlen: size of the @bmval array 265 * 266 * The server needs to return nfs_ok rather than nfserr_bad_xdr when 267 * encountering bitmaps containing bits it does not recognize. This 268 * includes bits in bitmap words past WORDn, where WORDn is the last 269 * bitmap WORD the implementation currently supports. Thus we are 270 * careful here to simply ignore bits in bitmap words that this 271 * implementation has yet to support explicitly. 272 * 273 * Return values: 274 * %nfs_ok: @bmval populated successfully 275 * %nfserr_bad_xdr: the encoded bitmap was invalid 276 */ 277 static __be32 278 nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen) 279 { 280 u32 i, count; 281 __be32 *p; 282 283 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 284 return nfserr_bad_xdr; 285 /* request sanity */ 286 if (count > 1000) 287 return nfserr_bad_xdr; 288 p = xdr_inline_decode(argp->xdr, count << 2); 289 if (!p) 290 return nfserr_bad_xdr; 291 i = 0; 292 while (i < count) 293 bmval[i++] = be32_to_cpup(p++); 294 while (i < bmlen) 295 bmval[i++] = 0; 296 297 return nfs_ok; 298 } 299 300 static __be32 301 nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace) 302 { 303 __be32 *p, status; 304 u32 length; 305 306 if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0) 307 return nfserr_bad_xdr; 308 if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0) 309 return nfserr_bad_xdr; 310 if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0) 311 return nfserr_bad_xdr; 312 313 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 314 return nfserr_bad_xdr; 315 p = xdr_inline_decode(argp->xdr, length); 316 if (!p) 317 return nfserr_bad_xdr; 318 ace->whotype = nfs4_acl_get_whotype((char *)p, length); 319 if (ace->whotype != NFS4_ACL_WHO_NAMED) 320 status = nfs_ok; 321 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 322 status = nfsd_map_name_to_gid(argp->rqstp, 323 (char *)p, length, &ace->who_gid); 324 else 325 status = nfsd_map_name_to_uid(argp->rqstp, 326 (char *)p, length, &ace->who_uid); 327 328 return status; 329 } 330 331 /* A counted array of nfsace4's */ 332 static noinline __be32 333 nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl) 334 { 335 struct nfs4_ace *ace; 336 __be32 status; 337 u32 count; 338 339 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 340 return nfserr_bad_xdr; 341 342 if (count > xdr_stream_remaining(argp->xdr) / 20) 343 /* 344 * Even with 4-byte names there wouldn't be 345 * space for that many aces; something fishy is 346 * going on: 347 */ 348 return nfserr_fbig; 349 350 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count)); 351 if (*acl == NULL) 352 return nfserr_jukebox; 353 354 (*acl)->naces = count; 355 for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) { 356 status = nfsd4_decode_nfsace4(argp, ace); 357 if (status) 358 return status; 359 } 360 361 return nfs_ok; 362 } 363 364 static noinline __be32 365 nfsd4_decode_security_label(struct nfsd4_compoundargs *argp, 366 struct xdr_netobj *label) 367 { 368 u32 lfs, pi, length; 369 __be32 *p; 370 371 if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0) 372 return nfserr_bad_xdr; 373 if (xdr_stream_decode_u32(argp->xdr, &pi) < 0) 374 return nfserr_bad_xdr; 375 376 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 377 return nfserr_bad_xdr; 378 if (length > NFS4_MAXLABELLEN) 379 return nfserr_badlabel; 380 p = xdr_inline_decode(argp->xdr, length); 381 if (!p) 382 return nfserr_bad_xdr; 383 label->len = length; 384 label->data = svcxdr_dupstr(argp, p, length); 385 if (!label->data) 386 return nfserr_jukebox; 387 388 return nfs_ok; 389 } 390 391 static __be32 392 nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen, 393 struct iattr *iattr, struct nfs4_acl **acl, 394 struct xdr_netobj *label, int *umask) 395 { 396 unsigned int starting_pos; 397 u32 attrlist4_count; 398 __be32 *p, status; 399 400 iattr->ia_valid = 0; 401 status = nfsd4_decode_bitmap4(argp, bmval, bmlen); 402 if (status) 403 return nfserr_bad_xdr; 404 405 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0 406 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1 407 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) { 408 if (nfsd_attrs_supported(argp->minorversion, bmval)) 409 return nfserr_inval; 410 return nfserr_attrnotsupp; 411 } 412 413 if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0) 414 return nfserr_bad_xdr; 415 starting_pos = xdr_stream_pos(argp->xdr); 416 417 if (bmval[0] & FATTR4_WORD0_SIZE) { 418 u64 size; 419 420 if (xdr_stream_decode_u64(argp->xdr, &size) < 0) 421 return nfserr_bad_xdr; 422 iattr->ia_size = size; 423 iattr->ia_valid |= ATTR_SIZE; 424 } 425 if (bmval[0] & FATTR4_WORD0_ACL) { 426 status = nfsd4_decode_acl(argp, acl); 427 if (status) 428 return status; 429 } else 430 *acl = NULL; 431 if (bmval[1] & FATTR4_WORD1_MODE) { 432 u32 mode; 433 434 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0) 435 return nfserr_bad_xdr; 436 iattr->ia_mode = mode; 437 iattr->ia_mode &= (S_IFMT | S_IALLUGO); 438 iattr->ia_valid |= ATTR_MODE; 439 } 440 if (bmval[1] & FATTR4_WORD1_OWNER) { 441 u32 length; 442 443 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 444 return nfserr_bad_xdr; 445 p = xdr_inline_decode(argp->xdr, length); 446 if (!p) 447 return nfserr_bad_xdr; 448 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length, 449 &iattr->ia_uid); 450 if (status) 451 return status; 452 iattr->ia_valid |= ATTR_UID; 453 } 454 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { 455 u32 length; 456 457 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 458 return nfserr_bad_xdr; 459 p = xdr_inline_decode(argp->xdr, length); 460 if (!p) 461 return nfserr_bad_xdr; 462 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length, 463 &iattr->ia_gid); 464 if (status) 465 return status; 466 iattr->ia_valid |= ATTR_GID; 467 } 468 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { 469 u32 set_it; 470 471 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0) 472 return nfserr_bad_xdr; 473 switch (set_it) { 474 case NFS4_SET_TO_CLIENT_TIME: 475 status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime); 476 if (status) 477 return status; 478 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 479 break; 480 case NFS4_SET_TO_SERVER_TIME: 481 iattr->ia_valid |= ATTR_ATIME; 482 break; 483 default: 484 return nfserr_bad_xdr; 485 } 486 } 487 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 488 u32 set_it; 489 490 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0) 491 return nfserr_bad_xdr; 492 switch (set_it) { 493 case NFS4_SET_TO_CLIENT_TIME: 494 status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime); 495 if (status) 496 return status; 497 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 498 break; 499 case NFS4_SET_TO_SERVER_TIME: 500 iattr->ia_valid |= ATTR_MTIME; 501 break; 502 default: 503 return nfserr_bad_xdr; 504 } 505 } 506 label->len = 0; 507 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) && 508 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) { 509 status = nfsd4_decode_security_label(argp, label); 510 if (status) 511 return status; 512 } 513 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) { 514 u32 mode, mask; 515 516 if (!umask) 517 return nfserr_bad_xdr; 518 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0) 519 return nfserr_bad_xdr; 520 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO); 521 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0) 522 return nfserr_bad_xdr; 523 *umask = mask & S_IRWXUGO; 524 iattr->ia_valid |= ATTR_MODE; 525 } 526 527 /* request sanity: did attrlist4 contain the expected number of words? */ 528 if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos) 529 return nfserr_bad_xdr; 530 531 return nfs_ok; 532 } 533 534 static __be32 535 nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid) 536 { 537 __be32 *p; 538 539 p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE); 540 if (!p) 541 return nfserr_bad_xdr; 542 sid->si_generation = be32_to_cpup(p++); 543 memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque)); 544 return nfs_ok; 545 } 546 547 static __be32 548 nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid) 549 { 550 __be32 *p; 551 552 p = xdr_inline_decode(argp->xdr, sizeof(__be64)); 553 if (!p) 554 return nfserr_bad_xdr; 555 memcpy(clientid, p, sizeof(*clientid)); 556 return nfs_ok; 557 } 558 559 static __be32 560 nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp, 561 clientid_t *clientid, struct xdr_netobj *owner) 562 { 563 __be32 status; 564 565 status = nfsd4_decode_clientid4(argp, clientid); 566 if (status) 567 return status; 568 return nfsd4_decode_opaque(argp, owner); 569 } 570 571 #ifdef CONFIG_NFSD_PNFS 572 static __be32 573 nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp, 574 struct nfsd4_deviceid *devid) 575 { 576 __be32 *p; 577 578 p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE); 579 if (!p) 580 return nfserr_bad_xdr; 581 memcpy(devid, p, sizeof(*devid)); 582 return nfs_ok; 583 } 584 585 static __be32 586 nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp, 587 struct nfsd4_layoutcommit *lcp) 588 { 589 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0) 590 return nfserr_bad_xdr; 591 if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES) 592 return nfserr_bad_xdr; 593 if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX) 594 return nfserr_bad_xdr; 595 596 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0) 597 return nfserr_bad_xdr; 598 if (lcp->lc_up_len > 0) { 599 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len); 600 if (!lcp->lc_up_layout) 601 return nfserr_bad_xdr; 602 } 603 604 return nfs_ok; 605 } 606 607 static __be32 608 nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp, 609 struct nfsd4_layoutreturn *lrp) 610 { 611 __be32 status; 612 613 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0) 614 return nfserr_bad_xdr; 615 switch (lrp->lr_return_type) { 616 case RETURN_FILE: 617 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0) 618 return nfserr_bad_xdr; 619 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0) 620 return nfserr_bad_xdr; 621 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid); 622 if (status) 623 return status; 624 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0) 625 return nfserr_bad_xdr; 626 if (lrp->lrf_body_len > 0) { 627 lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len); 628 if (!lrp->lrf_body) 629 return nfserr_bad_xdr; 630 } 631 break; 632 case RETURN_FSID: 633 case RETURN_ALL: 634 lrp->lr_seg.offset = 0; 635 lrp->lr_seg.length = NFS4_MAX_UINT64; 636 break; 637 default: 638 return nfserr_bad_xdr; 639 } 640 641 return nfs_ok; 642 } 643 644 #endif /* CONFIG_NFSD_PNFS */ 645 646 static __be32 647 nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp, 648 struct nfs4_sessionid *sessionid) 649 { 650 __be32 *p; 651 652 p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN); 653 if (!p) 654 return nfserr_bad_xdr; 655 memcpy(sessionid->data, p, sizeof(sessionid->data)); 656 return nfs_ok; 657 } 658 659 /* Defined in Appendix A of RFC 5531 */ 660 static __be32 661 nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp, 662 struct nfsd4_cb_sec *cbs) 663 { 664 u32 stamp, gidcount, uid, gid; 665 __be32 *p, status; 666 667 if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0) 668 return nfserr_bad_xdr; 669 /* machine name */ 670 status = nfsd4_decode_ignored_string(argp, 255); 671 if (status) 672 return status; 673 if (xdr_stream_decode_u32(argp->xdr, &uid) < 0) 674 return nfserr_bad_xdr; 675 if (xdr_stream_decode_u32(argp->xdr, &gid) < 0) 676 return nfserr_bad_xdr; 677 if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0) 678 return nfserr_bad_xdr; 679 if (gidcount > 16) 680 return nfserr_bad_xdr; 681 p = xdr_inline_decode(argp->xdr, gidcount << 2); 682 if (!p) 683 return nfserr_bad_xdr; 684 if (cbs->flavor == (u32)(-1)) { 685 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp); 686 687 kuid_t kuid = make_kuid(userns, uid); 688 kgid_t kgid = make_kgid(userns, gid); 689 if (uid_valid(kuid) && gid_valid(kgid)) { 690 cbs->uid = kuid; 691 cbs->gid = kgid; 692 cbs->flavor = RPC_AUTH_UNIX; 693 } else { 694 dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n"); 695 } 696 } 697 698 return nfs_ok; 699 } 700 701 static __be32 702 nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp, 703 struct nfsd4_cb_sec *cbs) 704 { 705 __be32 status; 706 u32 service; 707 708 dprintk("RPC_AUTH_GSS callback secflavor not supported!\n"); 709 710 if (xdr_stream_decode_u32(argp->xdr, &service) < 0) 711 return nfserr_bad_xdr; 712 if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY) 713 return nfserr_bad_xdr; 714 /* gcbp_handle_from_server */ 715 status = nfsd4_decode_ignored_string(argp, 0); 716 if (status) 717 return status; 718 /* gcbp_handle_from_client */ 719 status = nfsd4_decode_ignored_string(argp, 0); 720 if (status) 721 return status; 722 723 return nfs_ok; 724 } 725 726 /* a counted array of callback_sec_parms4 items */ 727 static __be32 728 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs) 729 { 730 u32 i, secflavor, nr_secflavs; 731 __be32 status; 732 733 /* callback_sec_params4 */ 734 if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0) 735 return nfserr_bad_xdr; 736 if (nr_secflavs) 737 cbs->flavor = (u32)(-1); 738 else 739 /* Is this legal? Be generous, take it to mean AUTH_NONE: */ 740 cbs->flavor = 0; 741 742 for (i = 0; i < nr_secflavs; ++i) { 743 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0) 744 return nfserr_bad_xdr; 745 switch (secflavor) { 746 case RPC_AUTH_NULL: 747 /* void */ 748 if (cbs->flavor == (u32)(-1)) 749 cbs->flavor = RPC_AUTH_NULL; 750 break; 751 case RPC_AUTH_UNIX: 752 status = nfsd4_decode_authsys_parms(argp, cbs); 753 if (status) 754 return status; 755 break; 756 case RPC_AUTH_GSS: 757 status = nfsd4_decode_gss_cb_handles4(argp, cbs); 758 if (status) 759 return status; 760 break; 761 default: 762 return nfserr_inval; 763 } 764 } 765 766 return nfs_ok; 767 } 768 769 770 /* 771 * NFSv4 operation argument decoders 772 */ 773 774 static __be32 775 nfsd4_decode_access(struct nfsd4_compoundargs *argp, 776 struct nfsd4_access *access) 777 { 778 if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0) 779 return nfserr_bad_xdr; 780 return nfs_ok; 781 } 782 783 static __be32 784 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close) 785 { 786 if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0) 787 return nfserr_bad_xdr; 788 return nfsd4_decode_stateid4(argp, &close->cl_stateid); 789 } 790 791 792 static __be32 793 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit) 794 { 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 return nfs_ok; 800 } 801 802 static __be32 803 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) 804 { 805 __be32 *p, status; 806 807 if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0) 808 return nfserr_bad_xdr; 809 switch (create->cr_type) { 810 case NF4LNK: 811 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0) 812 return nfserr_bad_xdr; 813 p = xdr_inline_decode(argp->xdr, create->cr_datalen); 814 if (!p) 815 return nfserr_bad_xdr; 816 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen); 817 if (!create->cr_data) 818 return nfserr_jukebox; 819 break; 820 case NF4BLK: 821 case NF4CHR: 822 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0) 823 return nfserr_bad_xdr; 824 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0) 825 return nfserr_bad_xdr; 826 break; 827 case NF4SOCK: 828 case NF4FIFO: 829 case NF4DIR: 830 default: 831 break; 832 } 833 status = nfsd4_decode_component4(argp, &create->cr_name, 834 &create->cr_namelen); 835 if (status) 836 return status; 837 status = nfsd4_decode_fattr4(argp, create->cr_bmval, 838 ARRAY_SIZE(create->cr_bmval), 839 &create->cr_iattr, &create->cr_acl, 840 &create->cr_label, &create->cr_umask); 841 if (status) 842 return status; 843 844 return nfs_ok; 845 } 846 847 static inline __be32 848 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr) 849 { 850 return nfsd4_decode_stateid4(argp, &dr->dr_stateid); 851 } 852 853 static inline __be32 854 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr) 855 { 856 return nfsd4_decode_bitmap4(argp, getattr->ga_bmval, 857 ARRAY_SIZE(getattr->ga_bmval)); 858 } 859 860 static __be32 861 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link) 862 { 863 return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen); 864 } 865 866 static __be32 867 nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp, 868 struct nfsd4_lock *lock) 869 { 870 __be32 status; 871 872 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0) 873 return nfserr_bad_xdr; 874 status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid); 875 if (status) 876 return status; 877 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0) 878 return nfserr_bad_xdr; 879 return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid, 880 &lock->lk_new_owner); 881 } 882 883 static __be32 884 nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp, 885 struct nfsd4_lock *lock) 886 { 887 __be32 status; 888 889 status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid); 890 if (status) 891 return status; 892 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0) 893 return nfserr_bad_xdr; 894 895 return nfs_ok; 896 } 897 898 static __be32 899 nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 900 { 901 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0) 902 return nfserr_bad_xdr; 903 if (lock->lk_is_new) 904 return nfsd4_decode_open_to_lock_owner4(argp, lock); 905 return nfsd4_decode_exist_lock_owner4(argp, lock); 906 } 907 908 static __be32 909 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 910 { 911 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0) 912 return nfserr_bad_xdr; 913 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 914 return nfserr_bad_xdr; 915 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0) 916 return nfserr_bad_xdr; 917 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0) 918 return nfserr_bad_xdr; 919 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0) 920 return nfserr_bad_xdr; 921 return nfsd4_decode_locker4(argp, lock); 922 } 923 924 static __be32 925 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt) 926 { 927 if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0) 928 return nfserr_bad_xdr; 929 if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 930 return nfserr_bad_xdr; 931 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0) 932 return nfserr_bad_xdr; 933 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0) 934 return nfserr_bad_xdr; 935 return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid, 936 &lockt->lt_owner); 937 } 938 939 static __be32 940 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku) 941 { 942 __be32 status; 943 944 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0) 945 return nfserr_bad_xdr; 946 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 947 return nfserr_bad_xdr; 948 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0) 949 return nfserr_bad_xdr; 950 status = nfsd4_decode_stateid4(argp, &locku->lu_stateid); 951 if (status) 952 return status; 953 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0) 954 return nfserr_bad_xdr; 955 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0) 956 return nfserr_bad_xdr; 957 958 return nfs_ok; 959 } 960 961 static __be32 962 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup) 963 { 964 return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len); 965 } 966 967 static __be32 968 nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 969 { 970 __be32 status; 971 972 if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0) 973 return nfserr_bad_xdr; 974 switch (open->op_createmode) { 975 case NFS4_CREATE_UNCHECKED: 976 case NFS4_CREATE_GUARDED: 977 status = nfsd4_decode_fattr4(argp, open->op_bmval, 978 ARRAY_SIZE(open->op_bmval), 979 &open->op_iattr, &open->op_acl, 980 &open->op_label, &open->op_umask); 981 if (status) 982 return status; 983 break; 984 case NFS4_CREATE_EXCLUSIVE: 985 status = nfsd4_decode_verifier4(argp, &open->op_verf); 986 if (status) 987 return status; 988 break; 989 case NFS4_CREATE_EXCLUSIVE4_1: 990 if (argp->minorversion < 1) 991 return nfserr_bad_xdr; 992 status = nfsd4_decode_verifier4(argp, &open->op_verf); 993 if (status) 994 return status; 995 status = nfsd4_decode_fattr4(argp, open->op_bmval, 996 ARRAY_SIZE(open->op_bmval), 997 &open->op_iattr, &open->op_acl, 998 &open->op_label, &open->op_umask); 999 if (status) 1000 return status; 1001 break; 1002 default: 1003 return nfserr_bad_xdr; 1004 } 1005 1006 return nfs_ok; 1007 } 1008 1009 static __be32 1010 nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 1011 { 1012 __be32 status; 1013 1014 if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0) 1015 return nfserr_bad_xdr; 1016 switch (open->op_create) { 1017 case NFS4_OPEN_NOCREATE: 1018 break; 1019 case NFS4_OPEN_CREATE: 1020 status = nfsd4_decode_createhow4(argp, open); 1021 if (status) 1022 return status; 1023 break; 1024 default: 1025 return nfserr_bad_xdr; 1026 } 1027 1028 return nfs_ok; 1029 } 1030 1031 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when) 1032 { 1033 u32 w; 1034 1035 if (xdr_stream_decode_u32(argp->xdr, &w) < 0) 1036 return nfserr_bad_xdr; 1037 *share_access = w & NFS4_SHARE_ACCESS_MASK; 1038 *deleg_want = w & NFS4_SHARE_WANT_MASK; 1039 if (deleg_when) 1040 *deleg_when = w & NFS4_SHARE_WHEN_MASK; 1041 1042 switch (w & NFS4_SHARE_ACCESS_MASK) { 1043 case NFS4_SHARE_ACCESS_READ: 1044 case NFS4_SHARE_ACCESS_WRITE: 1045 case NFS4_SHARE_ACCESS_BOTH: 1046 break; 1047 default: 1048 return nfserr_bad_xdr; 1049 } 1050 w &= ~NFS4_SHARE_ACCESS_MASK; 1051 if (!w) 1052 return nfs_ok; 1053 if (!argp->minorversion) 1054 return nfserr_bad_xdr; 1055 switch (w & NFS4_SHARE_WANT_MASK) { 1056 case NFS4_SHARE_WANT_NO_PREFERENCE: 1057 case NFS4_SHARE_WANT_READ_DELEG: 1058 case NFS4_SHARE_WANT_WRITE_DELEG: 1059 case NFS4_SHARE_WANT_ANY_DELEG: 1060 case NFS4_SHARE_WANT_NO_DELEG: 1061 case NFS4_SHARE_WANT_CANCEL: 1062 break; 1063 default: 1064 return nfserr_bad_xdr; 1065 } 1066 w &= ~NFS4_SHARE_WANT_MASK; 1067 if (!w) 1068 return nfs_ok; 1069 1070 if (!deleg_when) /* open_downgrade */ 1071 return nfserr_inval; 1072 switch (w) { 1073 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL: 1074 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED: 1075 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL | 1076 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED): 1077 return nfs_ok; 1078 } 1079 return nfserr_bad_xdr; 1080 } 1081 1082 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x) 1083 { 1084 if (xdr_stream_decode_u32(argp->xdr, x) < 0) 1085 return nfserr_bad_xdr; 1086 /* Note: unlike access bits, deny bits may be zero. */ 1087 if (*x & ~NFS4_SHARE_DENY_BOTH) 1088 return nfserr_bad_xdr; 1089 1090 return nfs_ok; 1091 } 1092 1093 static __be32 1094 nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp, 1095 struct nfsd4_open *open) 1096 { 1097 __be32 status; 1098 1099 if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0) 1100 return nfserr_bad_xdr; 1101 switch (open->op_claim_type) { 1102 case NFS4_OPEN_CLAIM_NULL: 1103 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1104 status = nfsd4_decode_component4(argp, &open->op_fname, 1105 &open->op_fnamelen); 1106 if (status) 1107 return status; 1108 break; 1109 case NFS4_OPEN_CLAIM_PREVIOUS: 1110 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0) 1111 return nfserr_bad_xdr; 1112 break; 1113 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1114 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid); 1115 if (status) 1116 return status; 1117 status = nfsd4_decode_component4(argp, &open->op_fname, 1118 &open->op_fnamelen); 1119 if (status) 1120 return status; 1121 break; 1122 case NFS4_OPEN_CLAIM_FH: 1123 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1124 if (argp->minorversion < 1) 1125 return nfserr_bad_xdr; 1126 /* void */ 1127 break; 1128 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1129 if (argp->minorversion < 1) 1130 return nfserr_bad_xdr; 1131 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid); 1132 if (status) 1133 return status; 1134 break; 1135 default: 1136 return nfserr_bad_xdr; 1137 } 1138 1139 return nfs_ok; 1140 } 1141 1142 static __be32 1143 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 1144 { 1145 __be32 status; 1146 u32 dummy; 1147 1148 memset(open->op_bmval, 0, sizeof(open->op_bmval)); 1149 open->op_iattr.ia_valid = 0; 1150 open->op_openowner = NULL; 1151 1152 open->op_xdr_error = 0; 1153 if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0) 1154 return nfserr_bad_xdr; 1155 /* deleg_want is ignored */ 1156 status = nfsd4_decode_share_access(argp, &open->op_share_access, 1157 &open->op_deleg_want, &dummy); 1158 if (status) 1159 return status; 1160 status = nfsd4_decode_share_deny(argp, &open->op_share_deny); 1161 if (status) 1162 return status; 1163 status = nfsd4_decode_state_owner4(argp, &open->op_clientid, 1164 &open->op_owner); 1165 if (status) 1166 return status; 1167 status = nfsd4_decode_openflag4(argp, open); 1168 if (status) 1169 return status; 1170 return nfsd4_decode_open_claim4(argp, open); 1171 } 1172 1173 static __be32 1174 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf) 1175 { 1176 __be32 status; 1177 1178 if (argp->minorversion >= 1) 1179 return nfserr_notsupp; 1180 1181 status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid); 1182 if (status) 1183 return status; 1184 if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0) 1185 return nfserr_bad_xdr; 1186 1187 return nfs_ok; 1188 } 1189 1190 static __be32 1191 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down) 1192 { 1193 __be32 status; 1194 1195 status = nfsd4_decode_stateid4(argp, &open_down->od_stateid); 1196 if (status) 1197 return status; 1198 if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0) 1199 return nfserr_bad_xdr; 1200 /* deleg_want is ignored */ 1201 status = nfsd4_decode_share_access(argp, &open_down->od_share_access, 1202 &open_down->od_deleg_want, NULL); 1203 if (status) 1204 return status; 1205 return nfsd4_decode_share_deny(argp, &open_down->od_share_deny); 1206 } 1207 1208 static __be32 1209 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh) 1210 { 1211 __be32 *p; 1212 1213 if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0) 1214 return nfserr_bad_xdr; 1215 if (putfh->pf_fhlen > NFS4_FHSIZE) 1216 return nfserr_bad_xdr; 1217 p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen); 1218 if (!p) 1219 return nfserr_bad_xdr; 1220 putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen); 1221 if (!putfh->pf_fhval) 1222 return nfserr_jukebox; 1223 1224 return nfs_ok; 1225 } 1226 1227 static __be32 1228 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p) 1229 { 1230 if (argp->minorversion == 0) 1231 return nfs_ok; 1232 return nfserr_notsupp; 1233 } 1234 1235 static __be32 1236 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read) 1237 { 1238 __be32 status; 1239 1240 status = nfsd4_decode_stateid4(argp, &read->rd_stateid); 1241 if (status) 1242 return status; 1243 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0) 1244 return nfserr_bad_xdr; 1245 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0) 1246 return nfserr_bad_xdr; 1247 1248 return nfs_ok; 1249 } 1250 1251 static __be32 1252 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir) 1253 { 1254 __be32 status; 1255 1256 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0) 1257 return nfserr_bad_xdr; 1258 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf); 1259 if (status) 1260 return status; 1261 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0) 1262 return nfserr_bad_xdr; 1263 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0) 1264 return nfserr_bad_xdr; 1265 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval, 1266 ARRAY_SIZE(readdir->rd_bmval)) < 0) 1267 return nfserr_bad_xdr; 1268 1269 return nfs_ok; 1270 } 1271 1272 static __be32 1273 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove) 1274 { 1275 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen); 1276 } 1277 1278 static __be32 1279 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename) 1280 { 1281 __be32 status; 1282 1283 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen); 1284 if (status) 1285 return status; 1286 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen); 1287 } 1288 1289 static __be32 1290 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid) 1291 { 1292 return nfsd4_decode_clientid4(argp, clientid); 1293 } 1294 1295 static __be32 1296 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp, 1297 struct nfsd4_secinfo *secinfo) 1298 { 1299 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen); 1300 } 1301 1302 static __be32 1303 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr) 1304 { 1305 __be32 status; 1306 1307 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid); 1308 if (status) 1309 return status; 1310 return nfsd4_decode_fattr4(argp, setattr->sa_bmval, 1311 ARRAY_SIZE(setattr->sa_bmval), 1312 &setattr->sa_iattr, &setattr->sa_acl, 1313 &setattr->sa_label, NULL); 1314 } 1315 1316 static __be32 1317 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid) 1318 { 1319 __be32 *p, status; 1320 1321 if (argp->minorversion >= 1) 1322 return nfserr_notsupp; 1323 1324 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf); 1325 if (status) 1326 return status; 1327 status = nfsd4_decode_opaque(argp, &setclientid->se_name); 1328 if (status) 1329 return status; 1330 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0) 1331 return nfserr_bad_xdr; 1332 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0) 1333 return nfserr_bad_xdr; 1334 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len); 1335 if (!p) 1336 return nfserr_bad_xdr; 1337 setclientid->se_callback_netid_val = svcxdr_savemem(argp, p, 1338 setclientid->se_callback_netid_len); 1339 if (!setclientid->se_callback_netid_val) 1340 return nfserr_jukebox; 1341 1342 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0) 1343 return nfserr_bad_xdr; 1344 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len); 1345 if (!p) 1346 return nfserr_bad_xdr; 1347 setclientid->se_callback_addr_val = svcxdr_savemem(argp, p, 1348 setclientid->se_callback_addr_len); 1349 if (!setclientid->se_callback_addr_val) 1350 return nfserr_jukebox; 1351 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0) 1352 return nfserr_bad_xdr; 1353 1354 return nfs_ok; 1355 } 1356 1357 static __be32 1358 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c) 1359 { 1360 __be32 status; 1361 1362 if (argp->minorversion >= 1) 1363 return nfserr_notsupp; 1364 1365 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid); 1366 if (status) 1367 return status; 1368 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm); 1369 } 1370 1371 /* Also used for NVERIFY */ 1372 static __be32 1373 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify) 1374 { 1375 __be32 *p, status; 1376 1377 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval, 1378 ARRAY_SIZE(verify->ve_bmval)); 1379 if (status) 1380 return status; 1381 1382 /* For convenience's sake, we compare raw xdr'd attributes in 1383 * nfsd4_proc_verify */ 1384 1385 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0) 1386 return nfserr_bad_xdr; 1387 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen); 1388 if (!p) 1389 return nfserr_bad_xdr; 1390 verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen); 1391 if (!verify->ve_attrval) 1392 return nfserr_jukebox; 1393 1394 return nfs_ok; 1395 } 1396 1397 static __be32 1398 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) 1399 { 1400 __be32 status; 1401 1402 status = nfsd4_decode_stateid4(argp, &write->wr_stateid); 1403 if (status) 1404 return status; 1405 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0) 1406 return nfserr_bad_xdr; 1407 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0) 1408 return nfserr_bad_xdr; 1409 if (write->wr_stable_how > NFS_FILE_SYNC) 1410 return nfserr_bad_xdr; 1411 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0) 1412 return nfserr_bad_xdr; 1413 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen)) 1414 return nfserr_bad_xdr; 1415 1416 return nfs_ok; 1417 } 1418 1419 static __be32 1420 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner) 1421 { 1422 __be32 status; 1423 1424 if (argp->minorversion >= 1) 1425 return nfserr_notsupp; 1426 1427 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid, 1428 &rlockowner->rl_owner); 1429 if (status) 1430 return status; 1431 1432 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid)) 1433 return nfserr_inval; 1434 1435 return nfs_ok; 1436 } 1437 1438 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc) 1439 { 1440 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0) 1441 return nfserr_bad_xdr; 1442 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec); 1443 } 1444 1445 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts) 1446 { 1447 u32 use_conn_in_rdma_mode; 1448 __be32 status; 1449 1450 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid); 1451 if (status) 1452 return status; 1453 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0) 1454 return nfserr_bad_xdr; 1455 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0) 1456 return nfserr_bad_xdr; 1457 1458 return nfs_ok; 1459 } 1460 1461 static __be32 1462 nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp, 1463 struct nfsd4_exchange_id *exid) 1464 { 1465 __be32 status; 1466 1467 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce, 1468 ARRAY_SIZE(exid->spo_must_enforce)); 1469 if (status) 1470 return nfserr_bad_xdr; 1471 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow, 1472 ARRAY_SIZE(exid->spo_must_allow)); 1473 if (status) 1474 return nfserr_bad_xdr; 1475 1476 return nfs_ok; 1477 } 1478 1479 /* 1480 * This implementation currently does not support SP4_SSV. 1481 * This decoder simply skips over these arguments. 1482 */ 1483 static noinline __be32 1484 nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp, 1485 struct nfsd4_exchange_id *exid) 1486 { 1487 u32 count, window, num_gss_handles; 1488 __be32 status; 1489 1490 /* ssp_ops */ 1491 status = nfsd4_decode_state_protect_ops(argp, exid); 1492 if (status) 1493 return status; 1494 1495 /* ssp_hash_algs<> */ 1496 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1497 return nfserr_bad_xdr; 1498 while (count--) { 1499 status = nfsd4_decode_ignored_string(argp, 0); 1500 if (status) 1501 return status; 1502 } 1503 1504 /* ssp_encr_algs<> */ 1505 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1506 return nfserr_bad_xdr; 1507 while (count--) { 1508 status = nfsd4_decode_ignored_string(argp, 0); 1509 if (status) 1510 return status; 1511 } 1512 1513 if (xdr_stream_decode_u32(argp->xdr, &window) < 0) 1514 return nfserr_bad_xdr; 1515 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0) 1516 return nfserr_bad_xdr; 1517 1518 return nfs_ok; 1519 } 1520 1521 static __be32 1522 nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp, 1523 struct nfsd4_exchange_id *exid) 1524 { 1525 __be32 status; 1526 1527 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0) 1528 return nfserr_bad_xdr; 1529 switch (exid->spa_how) { 1530 case SP4_NONE: 1531 break; 1532 case SP4_MACH_CRED: 1533 status = nfsd4_decode_state_protect_ops(argp, exid); 1534 if (status) 1535 return status; 1536 break; 1537 case SP4_SSV: 1538 status = nfsd4_decode_ssv_sp_parms(argp, exid); 1539 if (status) 1540 return status; 1541 break; 1542 default: 1543 return nfserr_bad_xdr; 1544 } 1545 1546 return nfs_ok; 1547 } 1548 1549 static __be32 1550 nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp, 1551 struct nfsd4_exchange_id *exid) 1552 { 1553 __be32 status; 1554 u32 count; 1555 1556 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1557 return nfserr_bad_xdr; 1558 switch (count) { 1559 case 0: 1560 break; 1561 case 1: 1562 /* Note that RFC 8881 places no length limit on 1563 * nii_domain, but this implementation permits no 1564 * more than NFS4_OPAQUE_LIMIT bytes */ 1565 status = nfsd4_decode_opaque(argp, &exid->nii_domain); 1566 if (status) 1567 return status; 1568 /* Note that RFC 8881 places no length limit on 1569 * nii_name, but this implementation permits no 1570 * more than NFS4_OPAQUE_LIMIT bytes */ 1571 status = nfsd4_decode_opaque(argp, &exid->nii_name); 1572 if (status) 1573 return status; 1574 status = nfsd4_decode_nfstime4(argp, &exid->nii_time); 1575 if (status) 1576 return status; 1577 break; 1578 default: 1579 return nfserr_bad_xdr; 1580 } 1581 1582 return nfs_ok; 1583 } 1584 1585 static __be32 1586 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp, 1587 struct nfsd4_exchange_id *exid) 1588 { 1589 __be32 status; 1590 1591 status = nfsd4_decode_verifier4(argp, &exid->verifier); 1592 if (status) 1593 return status; 1594 status = nfsd4_decode_opaque(argp, &exid->clname); 1595 if (status) 1596 return status; 1597 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0) 1598 return nfserr_bad_xdr; 1599 status = nfsd4_decode_state_protect4_a(argp, exid); 1600 if (status) 1601 return status; 1602 return nfsd4_decode_nfs_impl_id4(argp, exid); 1603 } 1604 1605 static __be32 1606 nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp, 1607 struct nfsd4_channel_attrs *ca) 1608 { 1609 __be32 *p; 1610 1611 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7); 1612 if (!p) 1613 return nfserr_bad_xdr; 1614 1615 /* headerpadsz is ignored */ 1616 p++; 1617 ca->maxreq_sz = be32_to_cpup(p++); 1618 ca->maxresp_sz = be32_to_cpup(p++); 1619 ca->maxresp_cached = be32_to_cpup(p++); 1620 ca->maxops = be32_to_cpup(p++); 1621 ca->maxreqs = be32_to_cpup(p++); 1622 ca->nr_rdma_attrs = be32_to_cpup(p); 1623 switch (ca->nr_rdma_attrs) { 1624 case 0: 1625 break; 1626 case 1: 1627 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0) 1628 return nfserr_bad_xdr; 1629 break; 1630 default: 1631 return nfserr_bad_xdr; 1632 } 1633 1634 return nfs_ok; 1635 } 1636 1637 static __be32 1638 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, 1639 struct nfsd4_create_session *sess) 1640 { 1641 __be32 status; 1642 1643 status = nfsd4_decode_clientid4(argp, &sess->clientid); 1644 if (status) 1645 return status; 1646 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0) 1647 return nfserr_bad_xdr; 1648 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0) 1649 return nfserr_bad_xdr; 1650 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel); 1651 if (status) 1652 return status; 1653 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel); 1654 if (status) 1655 return status; 1656 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0) 1657 return nfserr_bad_xdr; 1658 status = nfsd4_decode_cb_sec(argp, &sess->cb_sec); 1659 if (status) 1660 return status; 1661 1662 return nfs_ok; 1663 } 1664 1665 static __be32 1666 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp, 1667 struct nfsd4_destroy_session *destroy_session) 1668 { 1669 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid); 1670 } 1671 1672 static __be32 1673 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp, 1674 struct nfsd4_free_stateid *free_stateid) 1675 { 1676 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid); 1677 } 1678 1679 #ifdef CONFIG_NFSD_PNFS 1680 static __be32 1681 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp, 1682 struct nfsd4_getdeviceinfo *gdev) 1683 { 1684 __be32 status; 1685 1686 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid); 1687 if (status) 1688 return status; 1689 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0) 1690 return nfserr_bad_xdr; 1691 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0) 1692 return nfserr_bad_xdr; 1693 if (xdr_stream_decode_uint32_array(argp->xdr, 1694 &gdev->gd_notify_types, 1) < 0) 1695 return nfserr_bad_xdr; 1696 1697 return nfs_ok; 1698 } 1699 1700 static __be32 1701 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp, 1702 struct nfsd4_layoutcommit *lcp) 1703 { 1704 __be32 *p, status; 1705 1706 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0) 1707 return nfserr_bad_xdr; 1708 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0) 1709 return nfserr_bad_xdr; 1710 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0) 1711 return nfserr_bad_xdr; 1712 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid); 1713 if (status) 1714 return status; 1715 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0) 1716 return nfserr_bad_xdr; 1717 if (lcp->lc_newoffset) { 1718 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0) 1719 return nfserr_bad_xdr; 1720 } else 1721 lcp->lc_last_wr = 0; 1722 p = xdr_inline_decode(argp->xdr, XDR_UNIT); 1723 if (!p) 1724 return nfserr_bad_xdr; 1725 if (xdr_item_is_present(p)) { 1726 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime); 1727 if (status) 1728 return status; 1729 } else { 1730 lcp->lc_mtime.tv_nsec = UTIME_NOW; 1731 } 1732 return nfsd4_decode_layoutupdate4(argp, lcp); 1733 } 1734 1735 static __be32 1736 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp, 1737 struct nfsd4_layoutget *lgp) 1738 { 1739 __be32 status; 1740 1741 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0) 1742 return nfserr_bad_xdr; 1743 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0) 1744 return nfserr_bad_xdr; 1745 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0) 1746 return nfserr_bad_xdr; 1747 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0) 1748 return nfserr_bad_xdr; 1749 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0) 1750 return nfserr_bad_xdr; 1751 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0) 1752 return nfserr_bad_xdr; 1753 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid); 1754 if (status) 1755 return status; 1756 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0) 1757 return nfserr_bad_xdr; 1758 1759 return nfs_ok; 1760 } 1761 1762 static __be32 1763 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp, 1764 struct nfsd4_layoutreturn *lrp) 1765 { 1766 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0) 1767 return nfserr_bad_xdr; 1768 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0) 1769 return nfserr_bad_xdr; 1770 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0) 1771 return nfserr_bad_xdr; 1772 return nfsd4_decode_layoutreturn4(argp, lrp); 1773 } 1774 #endif /* CONFIG_NFSD_PNFS */ 1775 1776 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp, 1777 struct nfsd4_secinfo_no_name *sin) 1778 { 1779 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0) 1780 return nfserr_bad_xdr; 1781 return nfs_ok; 1782 } 1783 1784 static __be32 1785 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp, 1786 struct nfsd4_sequence *seq) 1787 { 1788 __be32 *p, status; 1789 1790 status = nfsd4_decode_sessionid4(argp, &seq->sessionid); 1791 if (status) 1792 return status; 1793 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4); 1794 if (!p) 1795 return nfserr_bad_xdr; 1796 seq->seqid = be32_to_cpup(p++); 1797 seq->slotid = be32_to_cpup(p++); 1798 seq->maxslots = be32_to_cpup(p++); 1799 seq->cachethis = be32_to_cpup(p); 1800 1801 return nfs_ok; 1802 } 1803 1804 static __be32 1805 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid) 1806 { 1807 struct nfsd4_test_stateid_id *stateid; 1808 __be32 status; 1809 u32 i; 1810 1811 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0) 1812 return nfserr_bad_xdr; 1813 1814 INIT_LIST_HEAD(&test_stateid->ts_stateid_list); 1815 for (i = 0; i < test_stateid->ts_num_ids; i++) { 1816 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); 1817 if (!stateid) 1818 return nfserrno(-ENOMEM); /* XXX: not jukebox? */ 1819 INIT_LIST_HEAD(&stateid->ts_id_list); 1820 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); 1821 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid); 1822 if (status) 1823 return status; 1824 } 1825 1826 return nfs_ok; 1827 } 1828 1829 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, 1830 struct nfsd4_destroy_clientid *dc) 1831 { 1832 return nfsd4_decode_clientid4(argp, &dc->clientid); 1833 } 1834 1835 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, 1836 struct nfsd4_reclaim_complete *rc) 1837 { 1838 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0) 1839 return nfserr_bad_xdr; 1840 return nfs_ok; 1841 } 1842 1843 static __be32 1844 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp, 1845 struct nfsd4_fallocate *fallocate) 1846 { 1847 __be32 status; 1848 1849 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid); 1850 if (status) 1851 return status; 1852 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0) 1853 return nfserr_bad_xdr; 1854 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0) 1855 return nfserr_bad_xdr; 1856 1857 return nfs_ok; 1858 } 1859 1860 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp, 1861 struct nl4_server *ns) 1862 { 1863 struct nfs42_netaddr *naddr; 1864 __be32 *p; 1865 1866 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0) 1867 return nfserr_bad_xdr; 1868 1869 /* currently support for 1 inter-server source server */ 1870 switch (ns->nl4_type) { 1871 case NL4_NETADDR: 1872 naddr = &ns->u.nl4_addr; 1873 1874 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0) 1875 return nfserr_bad_xdr; 1876 if (naddr->netid_len > RPCBIND_MAXNETIDLEN) 1877 return nfserr_bad_xdr; 1878 1879 p = xdr_inline_decode(argp->xdr, naddr->netid_len); 1880 if (!p) 1881 return nfserr_bad_xdr; 1882 memcpy(naddr->netid, p, naddr->netid_len); 1883 1884 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0) 1885 return nfserr_bad_xdr; 1886 if (naddr->addr_len > RPCBIND_MAXUADDRLEN) 1887 return nfserr_bad_xdr; 1888 1889 p = xdr_inline_decode(argp->xdr, naddr->addr_len); 1890 if (!p) 1891 return nfserr_bad_xdr; 1892 memcpy(naddr->addr, p, naddr->addr_len); 1893 break; 1894 default: 1895 return nfserr_bad_xdr; 1896 } 1897 1898 return nfs_ok; 1899 } 1900 1901 static __be32 1902 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy) 1903 { 1904 struct nl4_server *ns_dummy; 1905 u32 consecutive, i, count; 1906 __be32 status; 1907 1908 status = nfsd4_decode_stateid4(argp, ©->cp_src_stateid); 1909 if (status) 1910 return status; 1911 status = nfsd4_decode_stateid4(argp, ©->cp_dst_stateid); 1912 if (status) 1913 return status; 1914 if (xdr_stream_decode_u64(argp->xdr, ©->cp_src_pos) < 0) 1915 return nfserr_bad_xdr; 1916 if (xdr_stream_decode_u64(argp->xdr, ©->cp_dst_pos) < 0) 1917 return nfserr_bad_xdr; 1918 if (xdr_stream_decode_u64(argp->xdr, ©->cp_count) < 0) 1919 return nfserr_bad_xdr; 1920 /* ca_consecutive: we always do consecutive copies */ 1921 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0) 1922 return nfserr_bad_xdr; 1923 if (xdr_stream_decode_u32(argp->xdr, ©->cp_synchronous) < 0) 1924 return nfserr_bad_xdr; 1925 1926 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1927 return nfserr_bad_xdr; 1928 copy->cp_intra = false; 1929 if (count == 0) { /* intra-server copy */ 1930 copy->cp_intra = true; 1931 return nfs_ok; 1932 } 1933 1934 /* decode all the supplied server addresses but use only the first */ 1935 status = nfsd4_decode_nl4_server(argp, ©->cp_src); 1936 if (status) 1937 return status; 1938 1939 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL); 1940 if (ns_dummy == NULL) 1941 return nfserrno(-ENOMEM); /* XXX: jukebox? */ 1942 for (i = 0; i < count - 1; i++) { 1943 status = nfsd4_decode_nl4_server(argp, ns_dummy); 1944 if (status) { 1945 kfree(ns_dummy); 1946 return status; 1947 } 1948 } 1949 kfree(ns_dummy); 1950 1951 return nfs_ok; 1952 } 1953 1954 static __be32 1955 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp, 1956 struct nfsd4_copy_notify *cn) 1957 { 1958 __be32 status; 1959 1960 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid); 1961 if (status) 1962 return status; 1963 return nfsd4_decode_nl4_server(argp, &cn->cpn_dst); 1964 } 1965 1966 static __be32 1967 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp, 1968 struct nfsd4_offload_status *os) 1969 { 1970 return nfsd4_decode_stateid4(argp, &os->stateid); 1971 } 1972 1973 static __be32 1974 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek) 1975 { 1976 __be32 status; 1977 1978 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid); 1979 if (status) 1980 return status; 1981 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0) 1982 return nfserr_bad_xdr; 1983 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0) 1984 return nfserr_bad_xdr; 1985 1986 return nfs_ok; 1987 } 1988 1989 static __be32 1990 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone) 1991 { 1992 __be32 status; 1993 1994 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid); 1995 if (status) 1996 return status; 1997 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid); 1998 if (status) 1999 return status; 2000 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0) 2001 return nfserr_bad_xdr; 2002 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0) 2003 return nfserr_bad_xdr; 2004 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0) 2005 return nfserr_bad_xdr; 2006 2007 return nfs_ok; 2008 } 2009 2010 /* 2011 * XDR data that is more than PAGE_SIZE in size is normally part of a 2012 * read or write. However, the size of extended attributes is limited 2013 * by the maximum request size, and then further limited by the underlying 2014 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX 2015 * is 64k). Since there is no kvec- or page-based interface to xattrs, 2016 * and we're not dealing with contiguous pages, we need to do some copying. 2017 */ 2018 2019 /* 2020 * Decode data into buffer. 2021 */ 2022 static __be32 2023 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr, 2024 char **bufp, u32 buflen) 2025 { 2026 struct page **pages = xdr->pages; 2027 struct kvec *head = xdr->head; 2028 char *tmp, *dp; 2029 u32 len; 2030 2031 if (buflen <= head->iov_len) { 2032 /* 2033 * We're in luck, the head has enough space. Just return 2034 * the head, no need for copying. 2035 */ 2036 *bufp = head->iov_base; 2037 return 0; 2038 } 2039 2040 tmp = svcxdr_tmpalloc(argp, buflen); 2041 if (tmp == NULL) 2042 return nfserr_jukebox; 2043 2044 dp = tmp; 2045 memcpy(dp, head->iov_base, head->iov_len); 2046 buflen -= head->iov_len; 2047 dp += head->iov_len; 2048 2049 while (buflen > 0) { 2050 len = min_t(u32, buflen, PAGE_SIZE); 2051 memcpy(dp, page_address(*pages), len); 2052 2053 buflen -= len; 2054 dp += len; 2055 pages++; 2056 } 2057 2058 *bufp = tmp; 2059 return 0; 2060 } 2061 2062 /* 2063 * Get a user extended attribute name from the XDR buffer. 2064 * It will not have the "user." prefix, so prepend it. 2065 * Lastly, check for nul characters in the name. 2066 */ 2067 static __be32 2068 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep) 2069 { 2070 char *name, *sp, *dp; 2071 u32 namelen, cnt; 2072 __be32 *p; 2073 2074 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0) 2075 return nfserr_bad_xdr; 2076 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN)) 2077 return nfserr_nametoolong; 2078 if (namelen == 0) 2079 return nfserr_bad_xdr; 2080 p = xdr_inline_decode(argp->xdr, namelen); 2081 if (!p) 2082 return nfserr_bad_xdr; 2083 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1); 2084 if (!name) 2085 return nfserr_jukebox; 2086 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); 2087 2088 /* 2089 * Copy the extended attribute name over while checking for 0 2090 * characters. 2091 */ 2092 sp = (char *)p; 2093 dp = name + XATTR_USER_PREFIX_LEN; 2094 cnt = namelen; 2095 2096 while (cnt-- > 0) { 2097 if (*sp == '\0') 2098 return nfserr_bad_xdr; 2099 *dp++ = *sp++; 2100 } 2101 *dp = '\0'; 2102 2103 *namep = name; 2104 2105 return nfs_ok; 2106 } 2107 2108 /* 2109 * A GETXATTR op request comes without a length specifier. We just set the 2110 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum 2111 * channel reply size. nfsd_getxattr will probe the length of the xattr, 2112 * check it against getxa_len, and allocate + return the value. 2113 */ 2114 static __be32 2115 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp, 2116 struct nfsd4_getxattr *getxattr) 2117 { 2118 __be32 status; 2119 u32 maxcount; 2120 2121 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name); 2122 if (status) 2123 return status; 2124 2125 maxcount = svc_max_payload(argp->rqstp); 2126 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2127 2128 getxattr->getxa_len = maxcount; 2129 2130 return status; 2131 } 2132 2133 static __be32 2134 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp, 2135 struct nfsd4_setxattr *setxattr) 2136 { 2137 u32 flags, maxcount, size; 2138 __be32 status; 2139 2140 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0) 2141 return nfserr_bad_xdr; 2142 2143 if (flags > SETXATTR4_REPLACE) 2144 return nfserr_inval; 2145 setxattr->setxa_flags = flags; 2146 2147 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name); 2148 if (status) 2149 return status; 2150 2151 maxcount = svc_max_payload(argp->rqstp); 2152 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2153 2154 if (xdr_stream_decode_u32(argp->xdr, &size) < 0) 2155 return nfserr_bad_xdr; 2156 if (size > maxcount) 2157 return nfserr_xattr2big; 2158 2159 setxattr->setxa_len = size; 2160 if (size > 0) { 2161 struct xdr_buf payload; 2162 2163 if (!xdr_stream_subsegment(argp->xdr, &payload, size)) 2164 return nfserr_bad_xdr; 2165 status = nfsd4_vbuf_from_vector(argp, &payload, 2166 &setxattr->setxa_buf, size); 2167 } 2168 2169 return nfs_ok; 2170 } 2171 2172 static __be32 2173 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp, 2174 struct nfsd4_listxattrs *listxattrs) 2175 { 2176 u32 maxcount; 2177 2178 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0) 2179 return nfserr_bad_xdr; 2180 2181 /* 2182 * If the cookie is too large to have even one user.x attribute 2183 * plus trailing '\0' left in a maximum size buffer, it's invalid. 2184 */ 2185 if (listxattrs->lsxa_cookie >= 2186 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2))) 2187 return nfserr_badcookie; 2188 2189 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0) 2190 return nfserr_bad_xdr; 2191 if (maxcount < 8) 2192 /* Always need at least 2 words (length and one character) */ 2193 return nfserr_inval; 2194 2195 maxcount = min(maxcount, svc_max_payload(argp->rqstp)); 2196 listxattrs->lsxa_maxcount = maxcount; 2197 2198 return nfs_ok; 2199 } 2200 2201 static __be32 2202 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp, 2203 struct nfsd4_removexattr *removexattr) 2204 { 2205 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name); 2206 } 2207 2208 static __be32 2209 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p) 2210 { 2211 return nfs_ok; 2212 } 2213 2214 static __be32 2215 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p) 2216 { 2217 return nfserr_notsupp; 2218 } 2219 2220 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *); 2221 2222 static const nfsd4_dec nfsd4_dec_ops[] = { 2223 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access, 2224 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close, 2225 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit, 2226 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create, 2227 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp, 2228 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn, 2229 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr, 2230 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop, 2231 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link, 2232 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock, 2233 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt, 2234 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku, 2235 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup, 2236 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop, 2237 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify, 2238 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open, 2239 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp, 2240 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm, 2241 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade, 2242 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh, 2243 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh, 2244 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop, 2245 [OP_READ] = (nfsd4_dec)nfsd4_decode_read, 2246 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir, 2247 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop, 2248 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove, 2249 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename, 2250 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew, 2251 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop, 2252 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop, 2253 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo, 2254 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr, 2255 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid, 2256 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm, 2257 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify, 2258 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write, 2259 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner, 2260 2261 /* new operations for NFSv4.1 */ 2262 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl, 2263 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session, 2264 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id, 2265 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session, 2266 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session, 2267 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid, 2268 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 2269 #ifdef CONFIG_NFSD_PNFS 2270 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo, 2271 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 2272 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit, 2273 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget, 2274 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn, 2275 #else 2276 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp, 2277 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 2278 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp, 2279 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp, 2280 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp, 2281 #endif 2282 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name, 2283 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence, 2284 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp, 2285 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid, 2286 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 2287 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid, 2288 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete, 2289 2290 /* new operations for NFSv4.2 */ 2291 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 2292 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy, 2293 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_copy_notify, 2294 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 2295 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp, 2296 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp, 2297 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp, 2298 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_offload_status, 2299 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_offload_status, 2300 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_read, 2301 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek, 2302 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp, 2303 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone, 2304 /* RFC 8276 extended atributes operations */ 2305 [OP_GETXATTR] = (nfsd4_dec)nfsd4_decode_getxattr, 2306 [OP_SETXATTR] = (nfsd4_dec)nfsd4_decode_setxattr, 2307 [OP_LISTXATTRS] = (nfsd4_dec)nfsd4_decode_listxattrs, 2308 [OP_REMOVEXATTR] = (nfsd4_dec)nfsd4_decode_removexattr, 2309 }; 2310 2311 static inline bool 2312 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op) 2313 { 2314 if (op->opnum < FIRST_NFS4_OP) 2315 return false; 2316 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP) 2317 return false; 2318 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP) 2319 return false; 2320 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP) 2321 return false; 2322 return true; 2323 } 2324 2325 static bool 2326 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 2327 { 2328 struct nfsd4_op *op; 2329 bool cachethis = false; 2330 int auth_slack= argp->rqstp->rq_auth_slack; 2331 int max_reply = auth_slack + 8; /* opcnt, status */ 2332 int readcount = 0; 2333 int readbytes = 0; 2334 __be32 *p; 2335 int i; 2336 2337 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0) 2338 return false; 2339 max_reply += XDR_UNIT; 2340 argp->tag = NULL; 2341 if (unlikely(argp->taglen)) { 2342 if (argp->taglen > NFSD4_MAX_TAGLEN) 2343 return false; 2344 p = xdr_inline_decode(argp->xdr, argp->taglen); 2345 if (!p) 2346 return false; 2347 argp->tag = svcxdr_savemem(argp, p, argp->taglen); 2348 if (!argp->tag) 2349 return false; 2350 max_reply += xdr_align_size(argp->taglen); 2351 } 2352 2353 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0) 2354 return false; 2355 if (xdr_stream_decode_u32(argp->xdr, &argp->opcnt) < 0) 2356 return false; 2357 2358 /* 2359 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS 2360 * here, so we return success at the xdr level so that 2361 * nfsd4_proc can handle this is an NFS-level error. 2362 */ 2363 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND) 2364 return true; 2365 2366 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { 2367 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); 2368 if (!argp->ops) { 2369 argp->ops = argp->iops; 2370 dprintk("nfsd: couldn't allocate room for COMPOUND\n"); 2371 return false; 2372 } 2373 } 2374 2375 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 2376 argp->opcnt = 0; 2377 2378 for (i = 0; i < argp->opcnt; i++) { 2379 op = &argp->ops[i]; 2380 op->replay = NULL; 2381 2382 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0) 2383 return false; 2384 if (nfsd4_opnum_in_range(argp, op)) { 2385 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u); 2386 if (op->status != nfs_ok) 2387 trace_nfsd_compound_decode_err(argp->rqstp, 2388 argp->opcnt, i, 2389 op->opnum, 2390 op->status); 2391 } else { 2392 op->opnum = OP_ILLEGAL; 2393 op->status = nfserr_op_illegal; 2394 } 2395 op->opdesc = OPDESC(op); 2396 /* 2397 * We'll try to cache the result in the DRC if any one 2398 * op in the compound wants to be cached: 2399 */ 2400 cachethis |= nfsd4_cache_this_op(op); 2401 2402 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) { 2403 readcount++; 2404 readbytes += nfsd4_max_reply(argp->rqstp, op); 2405 } else 2406 max_reply += nfsd4_max_reply(argp->rqstp, op); 2407 /* 2408 * OP_LOCK and OP_LOCKT may return a conflicting lock. 2409 * (Special case because it will just skip encoding this 2410 * if it runs out of xdr buffer space, and it is the only 2411 * operation that behaves this way.) 2412 */ 2413 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT) 2414 max_reply += NFS4_OPAQUE_LIMIT; 2415 2416 if (op->status) { 2417 argp->opcnt = i+1; 2418 break; 2419 } 2420 } 2421 /* Sessions make the DRC unnecessary: */ 2422 if (argp->minorversion) 2423 cachethis = false; 2424 svc_reserve(argp->rqstp, max_reply + readbytes); 2425 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE; 2426 2427 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack) 2428 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags); 2429 2430 return true; 2431 } 2432 2433 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode, 2434 struct svc_export *exp) 2435 { 2436 if (exp->ex_flags & NFSEXP_V4ROOT) { 2437 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time)); 2438 *p++ = 0; 2439 } else 2440 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode)); 2441 return p; 2442 } 2443 2444 /* 2445 * ctime (in NFSv4, time_metadata) is not writeable, and the client 2446 * doesn't really care what resolution could theoretically be stored by 2447 * the filesystem. 2448 * 2449 * The client cares how close together changes can be while still 2450 * guaranteeing ctime changes. For most filesystems (which have 2451 * timestamps with nanosecond fields) that is limited by the resolution 2452 * of the time returned from current_time() (which I'm assuming to be 2453 * 1/HZ). 2454 */ 2455 static __be32 *encode_time_delta(__be32 *p, struct inode *inode) 2456 { 2457 struct timespec64 ts; 2458 u32 ns; 2459 2460 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran); 2461 ts = ns_to_timespec64(ns); 2462 2463 p = xdr_encode_hyper(p, ts.tv_sec); 2464 *p++ = cpu_to_be32(ts.tv_nsec); 2465 2466 return p; 2467 } 2468 2469 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c) 2470 { 2471 *p++ = cpu_to_be32(c->atomic); 2472 p = xdr_encode_hyper(p, c->before_change); 2473 p = xdr_encode_hyper(p, c->after_change); 2474 return p; 2475 } 2476 2477 /* Encode as an array of strings the string given with components 2478 * separated @sep, escaped with esc_enter and esc_exit. 2479 */ 2480 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep, 2481 char *components, char esc_enter, 2482 char esc_exit) 2483 { 2484 __be32 *p; 2485 __be32 pathlen; 2486 int pathlen_offset; 2487 int strlen, count=0; 2488 char *str, *end, *next; 2489 2490 dprintk("nfsd4_encode_components(%s)\n", components); 2491 2492 pathlen_offset = xdr->buf->len; 2493 p = xdr_reserve_space(xdr, 4); 2494 if (!p) 2495 return nfserr_resource; 2496 p++; /* We will fill this in with @count later */ 2497 2498 end = str = components; 2499 while (*end) { 2500 bool found_esc = false; 2501 2502 /* try to parse as esc_start, ..., esc_end, sep */ 2503 if (*str == esc_enter) { 2504 for (; *end && (*end != esc_exit); end++) 2505 /* find esc_exit or end of string */; 2506 next = end + 1; 2507 if (*end && (!*next || *next == sep)) { 2508 str++; 2509 found_esc = true; 2510 } 2511 } 2512 2513 if (!found_esc) 2514 for (; *end && (*end != sep); end++) 2515 /* find sep or end of string */; 2516 2517 strlen = end - str; 2518 if (strlen) { 2519 p = xdr_reserve_space(xdr, strlen + 4); 2520 if (!p) 2521 return nfserr_resource; 2522 p = xdr_encode_opaque(p, str, strlen); 2523 count++; 2524 } 2525 else 2526 end++; 2527 if (found_esc) 2528 end = next; 2529 2530 str = end; 2531 } 2532 pathlen = htonl(count); 2533 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4); 2534 return 0; 2535 } 2536 2537 /* Encode as an array of strings the string given with components 2538 * separated @sep. 2539 */ 2540 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep, 2541 char *components) 2542 { 2543 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0); 2544 } 2545 2546 /* 2547 * encode a location element of a fs_locations structure 2548 */ 2549 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr, 2550 struct nfsd4_fs_location *location) 2551 { 2552 __be32 status; 2553 2554 status = nfsd4_encode_components_esc(xdr, ':', location->hosts, 2555 '[', ']'); 2556 if (status) 2557 return status; 2558 status = nfsd4_encode_components(xdr, '/', location->path); 2559 if (status) 2560 return status; 2561 return 0; 2562 } 2563 2564 /* 2565 * Encode a path in RFC3530 'pathname4' format 2566 */ 2567 static __be32 nfsd4_encode_path(struct xdr_stream *xdr, 2568 const struct path *root, 2569 const struct path *path) 2570 { 2571 struct path cur = *path; 2572 __be32 *p; 2573 struct dentry **components = NULL; 2574 unsigned int ncomponents = 0; 2575 __be32 err = nfserr_jukebox; 2576 2577 dprintk("nfsd4_encode_components("); 2578 2579 path_get(&cur); 2580 /* First walk the path up to the nfsd root, and store the 2581 * dentries/path components in an array. 2582 */ 2583 for (;;) { 2584 if (path_equal(&cur, root)) 2585 break; 2586 if (cur.dentry == cur.mnt->mnt_root) { 2587 if (follow_up(&cur)) 2588 continue; 2589 goto out_free; 2590 } 2591 if ((ncomponents & 15) == 0) { 2592 struct dentry **new; 2593 new = krealloc(components, 2594 sizeof(*new) * (ncomponents + 16), 2595 GFP_KERNEL); 2596 if (!new) 2597 goto out_free; 2598 components = new; 2599 } 2600 components[ncomponents++] = cur.dentry; 2601 cur.dentry = dget_parent(cur.dentry); 2602 } 2603 err = nfserr_resource; 2604 p = xdr_reserve_space(xdr, 4); 2605 if (!p) 2606 goto out_free; 2607 *p++ = cpu_to_be32(ncomponents); 2608 2609 while (ncomponents) { 2610 struct dentry *dentry = components[ncomponents - 1]; 2611 unsigned int len; 2612 2613 spin_lock(&dentry->d_lock); 2614 len = dentry->d_name.len; 2615 p = xdr_reserve_space(xdr, len + 4); 2616 if (!p) { 2617 spin_unlock(&dentry->d_lock); 2618 goto out_free; 2619 } 2620 p = xdr_encode_opaque(p, dentry->d_name.name, len); 2621 dprintk("/%pd", dentry); 2622 spin_unlock(&dentry->d_lock); 2623 dput(dentry); 2624 ncomponents--; 2625 } 2626 2627 err = 0; 2628 out_free: 2629 dprintk(")\n"); 2630 while (ncomponents) 2631 dput(components[--ncomponents]); 2632 kfree(components); 2633 path_put(&cur); 2634 return err; 2635 } 2636 2637 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr, 2638 struct svc_rqst *rqstp, const struct path *path) 2639 { 2640 struct svc_export *exp_ps; 2641 __be32 res; 2642 2643 exp_ps = rqst_find_fsidzero_export(rqstp); 2644 if (IS_ERR(exp_ps)) 2645 return nfserrno(PTR_ERR(exp_ps)); 2646 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path); 2647 exp_put(exp_ps); 2648 return res; 2649 } 2650 2651 /* 2652 * encode a fs_locations structure 2653 */ 2654 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr, 2655 struct svc_rqst *rqstp, struct svc_export *exp) 2656 { 2657 __be32 status; 2658 int i; 2659 __be32 *p; 2660 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; 2661 2662 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path); 2663 if (status) 2664 return status; 2665 p = xdr_reserve_space(xdr, 4); 2666 if (!p) 2667 return nfserr_resource; 2668 *p++ = cpu_to_be32(fslocs->locations_count); 2669 for (i=0; i<fslocs->locations_count; i++) { 2670 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]); 2671 if (status) 2672 return status; 2673 } 2674 return 0; 2675 } 2676 2677 static u32 nfs4_file_type(umode_t mode) 2678 { 2679 switch (mode & S_IFMT) { 2680 case S_IFIFO: return NF4FIFO; 2681 case S_IFCHR: return NF4CHR; 2682 case S_IFDIR: return NF4DIR; 2683 case S_IFBLK: return NF4BLK; 2684 case S_IFLNK: return NF4LNK; 2685 case S_IFREG: return NF4REG; 2686 case S_IFSOCK: return NF4SOCK; 2687 default: return NF4BAD; 2688 } 2689 } 2690 2691 static inline __be32 2692 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2693 struct nfs4_ace *ace) 2694 { 2695 if (ace->whotype != NFS4_ACL_WHO_NAMED) 2696 return nfs4_acl_write_who(xdr, ace->whotype); 2697 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 2698 return nfsd4_encode_group(xdr, rqstp, ace->who_gid); 2699 else 2700 return nfsd4_encode_user(xdr, rqstp, ace->who_uid); 2701 } 2702 2703 static inline __be32 2704 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types) 2705 { 2706 __be32 *p; 2707 unsigned long i = hweight_long(layout_types); 2708 2709 p = xdr_reserve_space(xdr, 4 + 4 * i); 2710 if (!p) 2711 return nfserr_resource; 2712 2713 *p++ = cpu_to_be32(i); 2714 2715 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 2716 if (layout_types & (1 << i)) 2717 *p++ = cpu_to_be32(i); 2718 2719 return 0; 2720 } 2721 2722 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ 2723 FATTR4_WORD0_RDATTR_ERROR) 2724 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID 2725 #define WORD2_ABSENT_FS_ATTRS 0 2726 2727 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2728 static inline __be32 2729 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2730 void *context, int len) 2731 { 2732 __be32 *p; 2733 2734 p = xdr_reserve_space(xdr, len + 4 + 4 + 4); 2735 if (!p) 2736 return nfserr_resource; 2737 2738 /* 2739 * For now we use a 0 here to indicate the null translation; in 2740 * the future we may place a call to translation code here. 2741 */ 2742 *p++ = cpu_to_be32(0); /* lfs */ 2743 *p++ = cpu_to_be32(0); /* pi */ 2744 p = xdr_encode_opaque(p, context, len); 2745 return 0; 2746 } 2747 #else 2748 static inline __be32 2749 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2750 void *context, int len) 2751 { return 0; } 2752 #endif 2753 2754 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err) 2755 { 2756 /* As per referral draft: */ 2757 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || 2758 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { 2759 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || 2760 *bmval0 & FATTR4_WORD0_FS_LOCATIONS) 2761 *rdattr_err = NFSERR_MOVED; 2762 else 2763 return nfserr_moved; 2764 } 2765 *bmval0 &= WORD0_ABSENT_FS_ATTRS; 2766 *bmval1 &= WORD1_ABSENT_FS_ATTRS; 2767 *bmval2 &= WORD2_ABSENT_FS_ATTRS; 2768 return 0; 2769 } 2770 2771 2772 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat) 2773 { 2774 struct path path = exp->ex_path; 2775 int err; 2776 2777 path_get(&path); 2778 while (follow_up(&path)) { 2779 if (path.dentry != path.mnt->mnt_root) 2780 break; 2781 } 2782 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2783 path_put(&path); 2784 return err; 2785 } 2786 2787 static __be32 2788 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2) 2789 { 2790 __be32 *p; 2791 2792 if (bmval2) { 2793 p = xdr_reserve_space(xdr, 16); 2794 if (!p) 2795 goto out_resource; 2796 *p++ = cpu_to_be32(3); 2797 *p++ = cpu_to_be32(bmval0); 2798 *p++ = cpu_to_be32(bmval1); 2799 *p++ = cpu_to_be32(bmval2); 2800 } else if (bmval1) { 2801 p = xdr_reserve_space(xdr, 12); 2802 if (!p) 2803 goto out_resource; 2804 *p++ = cpu_to_be32(2); 2805 *p++ = cpu_to_be32(bmval0); 2806 *p++ = cpu_to_be32(bmval1); 2807 } else { 2808 p = xdr_reserve_space(xdr, 8); 2809 if (!p) 2810 goto out_resource; 2811 *p++ = cpu_to_be32(1); 2812 *p++ = cpu_to_be32(bmval0); 2813 } 2814 2815 return 0; 2816 out_resource: 2817 return nfserr_resource; 2818 } 2819 2820 /* 2821 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 2822 * ourselves. 2823 */ 2824 static __be32 2825 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, 2826 struct svc_export *exp, 2827 struct dentry *dentry, u32 *bmval, 2828 struct svc_rqst *rqstp, int ignore_crossmnt) 2829 { 2830 u32 bmval0 = bmval[0]; 2831 u32 bmval1 = bmval[1]; 2832 u32 bmval2 = bmval[2]; 2833 struct kstat stat; 2834 struct svc_fh *tempfh = NULL; 2835 struct kstatfs statfs; 2836 __be32 *p; 2837 int starting_len = xdr->buf->len; 2838 int attrlen_offset; 2839 __be32 attrlen; 2840 u32 dummy; 2841 u64 dummy64; 2842 u32 rdattr_err = 0; 2843 __be32 status; 2844 int err; 2845 struct nfs4_acl *acl = NULL; 2846 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2847 void *context = NULL; 2848 int contextlen; 2849 #endif 2850 bool contextsupport = false; 2851 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2852 u32 minorversion = resp->cstate.minorversion; 2853 struct path path = { 2854 .mnt = exp->ex_path.mnt, 2855 .dentry = dentry, 2856 }; 2857 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2858 2859 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); 2860 BUG_ON(!nfsd_attrs_supported(minorversion, bmval)); 2861 2862 if (exp->ex_fslocs.migrated) { 2863 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err); 2864 if (status) 2865 goto out; 2866 } 2867 2868 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2869 if (err) 2870 goto out_nfserr; 2871 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE | 2872 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || 2873 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 2874 FATTR4_WORD1_SPACE_TOTAL))) { 2875 err = vfs_statfs(&path, &statfs); 2876 if (err) 2877 goto out_nfserr; 2878 } 2879 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { 2880 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); 2881 status = nfserr_jukebox; 2882 if (!tempfh) 2883 goto out; 2884 fh_init(tempfh, NFS4_FHSIZE); 2885 status = fh_compose(tempfh, exp, dentry, NULL); 2886 if (status) 2887 goto out; 2888 fhp = tempfh; 2889 } 2890 if (bmval0 & FATTR4_WORD0_ACL) { 2891 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); 2892 if (err == -EOPNOTSUPP) 2893 bmval0 &= ~FATTR4_WORD0_ACL; 2894 else if (err == -EINVAL) { 2895 status = nfserr_attrnotsupp; 2896 goto out; 2897 } else if (err != 0) 2898 goto out_nfserr; 2899 } 2900 2901 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2902 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) || 2903 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2904 if (exp->ex_flags & NFSEXP_SECURITY_LABEL) 2905 err = security_inode_getsecctx(d_inode(dentry), 2906 &context, &contextlen); 2907 else 2908 err = -EOPNOTSUPP; 2909 contextsupport = (err == 0); 2910 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2911 if (err == -EOPNOTSUPP) 2912 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL; 2913 else if (err) 2914 goto out_nfserr; 2915 } 2916 } 2917 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2918 2919 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2); 2920 if (status) 2921 goto out; 2922 2923 attrlen_offset = xdr->buf->len; 2924 p = xdr_reserve_space(xdr, 4); 2925 if (!p) 2926 goto out_resource; 2927 p++; /* to be backfilled later */ 2928 2929 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2930 u32 supp[3]; 2931 2932 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2933 2934 if (!IS_POSIXACL(dentry->d_inode)) 2935 supp[0] &= ~FATTR4_WORD0_ACL; 2936 if (!contextsupport) 2937 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2938 if (!supp[2]) { 2939 p = xdr_reserve_space(xdr, 12); 2940 if (!p) 2941 goto out_resource; 2942 *p++ = cpu_to_be32(2); 2943 *p++ = cpu_to_be32(supp[0]); 2944 *p++ = cpu_to_be32(supp[1]); 2945 } else { 2946 p = xdr_reserve_space(xdr, 16); 2947 if (!p) 2948 goto out_resource; 2949 *p++ = cpu_to_be32(3); 2950 *p++ = cpu_to_be32(supp[0]); 2951 *p++ = cpu_to_be32(supp[1]); 2952 *p++ = cpu_to_be32(supp[2]); 2953 } 2954 } 2955 if (bmval0 & FATTR4_WORD0_TYPE) { 2956 p = xdr_reserve_space(xdr, 4); 2957 if (!p) 2958 goto out_resource; 2959 dummy = nfs4_file_type(stat.mode); 2960 if (dummy == NF4BAD) { 2961 status = nfserr_serverfault; 2962 goto out; 2963 } 2964 *p++ = cpu_to_be32(dummy); 2965 } 2966 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { 2967 p = xdr_reserve_space(xdr, 4); 2968 if (!p) 2969 goto out_resource; 2970 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 2971 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT); 2972 else 2973 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT| 2974 NFS4_FH_VOL_RENAME); 2975 } 2976 if (bmval0 & FATTR4_WORD0_CHANGE) { 2977 p = xdr_reserve_space(xdr, 8); 2978 if (!p) 2979 goto out_resource; 2980 p = encode_change(p, &stat, d_inode(dentry), exp); 2981 } 2982 if (bmval0 & FATTR4_WORD0_SIZE) { 2983 p = xdr_reserve_space(xdr, 8); 2984 if (!p) 2985 goto out_resource; 2986 p = xdr_encode_hyper(p, stat.size); 2987 } 2988 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { 2989 p = xdr_reserve_space(xdr, 4); 2990 if (!p) 2991 goto out_resource; 2992 *p++ = cpu_to_be32(1); 2993 } 2994 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { 2995 p = xdr_reserve_space(xdr, 4); 2996 if (!p) 2997 goto out_resource; 2998 *p++ = cpu_to_be32(1); 2999 } 3000 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { 3001 p = xdr_reserve_space(xdr, 4); 3002 if (!p) 3003 goto out_resource; 3004 *p++ = cpu_to_be32(0); 3005 } 3006 if (bmval0 & FATTR4_WORD0_FSID) { 3007 p = xdr_reserve_space(xdr, 16); 3008 if (!p) 3009 goto out_resource; 3010 if (exp->ex_fslocs.migrated) { 3011 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR); 3012 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR); 3013 } else switch(fsid_source(fhp)) { 3014 case FSIDSOURCE_FSID: 3015 p = xdr_encode_hyper(p, (u64)exp->ex_fsid); 3016 p = xdr_encode_hyper(p, (u64)0); 3017 break; 3018 case FSIDSOURCE_DEV: 3019 *p++ = cpu_to_be32(0); 3020 *p++ = cpu_to_be32(MAJOR(stat.dev)); 3021 *p++ = cpu_to_be32(0); 3022 *p++ = cpu_to_be32(MINOR(stat.dev)); 3023 break; 3024 case FSIDSOURCE_UUID: 3025 p = xdr_encode_opaque_fixed(p, exp->ex_uuid, 3026 EX_UUID_LEN); 3027 break; 3028 } 3029 } 3030 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { 3031 p = xdr_reserve_space(xdr, 4); 3032 if (!p) 3033 goto out_resource; 3034 *p++ = cpu_to_be32(0); 3035 } 3036 if (bmval0 & FATTR4_WORD0_LEASE_TIME) { 3037 p = xdr_reserve_space(xdr, 4); 3038 if (!p) 3039 goto out_resource; 3040 *p++ = cpu_to_be32(nn->nfsd4_lease); 3041 } 3042 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { 3043 p = xdr_reserve_space(xdr, 4); 3044 if (!p) 3045 goto out_resource; 3046 *p++ = cpu_to_be32(rdattr_err); 3047 } 3048 if (bmval0 & FATTR4_WORD0_ACL) { 3049 struct nfs4_ace *ace; 3050 3051 if (acl == NULL) { 3052 p = xdr_reserve_space(xdr, 4); 3053 if (!p) 3054 goto out_resource; 3055 3056 *p++ = cpu_to_be32(0); 3057 goto out_acl; 3058 } 3059 p = xdr_reserve_space(xdr, 4); 3060 if (!p) 3061 goto out_resource; 3062 *p++ = cpu_to_be32(acl->naces); 3063 3064 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 3065 p = xdr_reserve_space(xdr, 4*3); 3066 if (!p) 3067 goto out_resource; 3068 *p++ = cpu_to_be32(ace->type); 3069 *p++ = cpu_to_be32(ace->flag); 3070 *p++ = cpu_to_be32(ace->access_mask & 3071 NFS4_ACE_MASK_ALL); 3072 status = nfsd4_encode_aclname(xdr, rqstp, ace); 3073 if (status) 3074 goto out; 3075 } 3076 } 3077 out_acl: 3078 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { 3079 p = xdr_reserve_space(xdr, 4); 3080 if (!p) 3081 goto out_resource; 3082 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ? 3083 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); 3084 } 3085 if (bmval0 & FATTR4_WORD0_CANSETTIME) { 3086 p = xdr_reserve_space(xdr, 4); 3087 if (!p) 3088 goto out_resource; 3089 *p++ = cpu_to_be32(1); 3090 } 3091 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { 3092 p = xdr_reserve_space(xdr, 4); 3093 if (!p) 3094 goto out_resource; 3095 *p++ = cpu_to_be32(0); 3096 } 3097 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { 3098 p = xdr_reserve_space(xdr, 4); 3099 if (!p) 3100 goto out_resource; 3101 *p++ = cpu_to_be32(1); 3102 } 3103 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { 3104 p = xdr_reserve_space(xdr, 4); 3105 if (!p) 3106 goto out_resource; 3107 *p++ = cpu_to_be32(1); 3108 } 3109 if (bmval0 & FATTR4_WORD0_FILEHANDLE) { 3110 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4); 3111 if (!p) 3112 goto out_resource; 3113 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, 3114 fhp->fh_handle.fh_size); 3115 } 3116 if (bmval0 & FATTR4_WORD0_FILEID) { 3117 p = xdr_reserve_space(xdr, 8); 3118 if (!p) 3119 goto out_resource; 3120 p = xdr_encode_hyper(p, stat.ino); 3121 } 3122 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { 3123 p = xdr_reserve_space(xdr, 8); 3124 if (!p) 3125 goto out_resource; 3126 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 3127 } 3128 if (bmval0 & FATTR4_WORD0_FILES_FREE) { 3129 p = xdr_reserve_space(xdr, 8); 3130 if (!p) 3131 goto out_resource; 3132 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 3133 } 3134 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { 3135 p = xdr_reserve_space(xdr, 8); 3136 if (!p) 3137 goto out_resource; 3138 p = xdr_encode_hyper(p, (u64) statfs.f_files); 3139 } 3140 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) { 3141 status = nfsd4_encode_fs_locations(xdr, rqstp, exp); 3142 if (status) 3143 goto out; 3144 } 3145 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { 3146 p = xdr_reserve_space(xdr, 4); 3147 if (!p) 3148 goto out_resource; 3149 *p++ = cpu_to_be32(1); 3150 } 3151 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { 3152 p = xdr_reserve_space(xdr, 8); 3153 if (!p) 3154 goto out_resource; 3155 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes); 3156 } 3157 if (bmval0 & FATTR4_WORD0_MAXLINK) { 3158 p = xdr_reserve_space(xdr, 4); 3159 if (!p) 3160 goto out_resource; 3161 *p++ = cpu_to_be32(255); 3162 } 3163 if (bmval0 & FATTR4_WORD0_MAXNAME) { 3164 p = xdr_reserve_space(xdr, 4); 3165 if (!p) 3166 goto out_resource; 3167 *p++ = cpu_to_be32(statfs.f_namelen); 3168 } 3169 if (bmval0 & FATTR4_WORD0_MAXREAD) { 3170 p = xdr_reserve_space(xdr, 8); 3171 if (!p) 3172 goto out_resource; 3173 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 3174 } 3175 if (bmval0 & FATTR4_WORD0_MAXWRITE) { 3176 p = xdr_reserve_space(xdr, 8); 3177 if (!p) 3178 goto out_resource; 3179 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 3180 } 3181 if (bmval1 & FATTR4_WORD1_MODE) { 3182 p = xdr_reserve_space(xdr, 4); 3183 if (!p) 3184 goto out_resource; 3185 *p++ = cpu_to_be32(stat.mode & S_IALLUGO); 3186 } 3187 if (bmval1 & FATTR4_WORD1_NO_TRUNC) { 3188 p = xdr_reserve_space(xdr, 4); 3189 if (!p) 3190 goto out_resource; 3191 *p++ = cpu_to_be32(1); 3192 } 3193 if (bmval1 & FATTR4_WORD1_NUMLINKS) { 3194 p = xdr_reserve_space(xdr, 4); 3195 if (!p) 3196 goto out_resource; 3197 *p++ = cpu_to_be32(stat.nlink); 3198 } 3199 if (bmval1 & FATTR4_WORD1_OWNER) { 3200 status = nfsd4_encode_user(xdr, rqstp, stat.uid); 3201 if (status) 3202 goto out; 3203 } 3204 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { 3205 status = nfsd4_encode_group(xdr, rqstp, stat.gid); 3206 if (status) 3207 goto out; 3208 } 3209 if (bmval1 & FATTR4_WORD1_RAWDEV) { 3210 p = xdr_reserve_space(xdr, 8); 3211 if (!p) 3212 goto out_resource; 3213 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev)); 3214 *p++ = cpu_to_be32((u32) MINOR(stat.rdev)); 3215 } 3216 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { 3217 p = xdr_reserve_space(xdr, 8); 3218 if (!p) 3219 goto out_resource; 3220 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; 3221 p = xdr_encode_hyper(p, dummy64); 3222 } 3223 if (bmval1 & FATTR4_WORD1_SPACE_FREE) { 3224 p = xdr_reserve_space(xdr, 8); 3225 if (!p) 3226 goto out_resource; 3227 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; 3228 p = xdr_encode_hyper(p, dummy64); 3229 } 3230 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { 3231 p = xdr_reserve_space(xdr, 8); 3232 if (!p) 3233 goto out_resource; 3234 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; 3235 p = xdr_encode_hyper(p, dummy64); 3236 } 3237 if (bmval1 & FATTR4_WORD1_SPACE_USED) { 3238 p = xdr_reserve_space(xdr, 8); 3239 if (!p) 3240 goto out_resource; 3241 dummy64 = (u64)stat.blocks << 9; 3242 p = xdr_encode_hyper(p, dummy64); 3243 } 3244 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { 3245 p = xdr_reserve_space(xdr, 12); 3246 if (!p) 3247 goto out_resource; 3248 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec); 3249 *p++ = cpu_to_be32(stat.atime.tv_nsec); 3250 } 3251 if (bmval1 & FATTR4_WORD1_TIME_DELTA) { 3252 p = xdr_reserve_space(xdr, 12); 3253 if (!p) 3254 goto out_resource; 3255 p = encode_time_delta(p, d_inode(dentry)); 3256 } 3257 if (bmval1 & FATTR4_WORD1_TIME_METADATA) { 3258 p = xdr_reserve_space(xdr, 12); 3259 if (!p) 3260 goto out_resource; 3261 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec); 3262 *p++ = cpu_to_be32(stat.ctime.tv_nsec); 3263 } 3264 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { 3265 p = xdr_reserve_space(xdr, 12); 3266 if (!p) 3267 goto out_resource; 3268 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec); 3269 *p++ = cpu_to_be32(stat.mtime.tv_nsec); 3270 } 3271 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { 3272 struct kstat parent_stat; 3273 u64 ino = stat.ino; 3274 3275 p = xdr_reserve_space(xdr, 8); 3276 if (!p) 3277 goto out_resource; 3278 /* 3279 * Get parent's attributes if not ignoring crossmount 3280 * and this is the root of a cross-mounted filesystem. 3281 */ 3282 if (ignore_crossmnt == 0 && 3283 dentry == exp->ex_path.mnt->mnt_root) { 3284 err = get_parent_attributes(exp, &parent_stat); 3285 if (err) 3286 goto out_nfserr; 3287 ino = parent_stat.ino; 3288 } 3289 p = xdr_encode_hyper(p, ino); 3290 } 3291 #ifdef CONFIG_NFSD_PNFS 3292 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) { 3293 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 3294 if (status) 3295 goto out; 3296 } 3297 3298 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) { 3299 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 3300 if (status) 3301 goto out; 3302 } 3303 3304 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) { 3305 p = xdr_reserve_space(xdr, 4); 3306 if (!p) 3307 goto out_resource; 3308 *p++ = cpu_to_be32(stat.blksize); 3309 } 3310 #endif /* CONFIG_NFSD_PNFS */ 3311 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) { 3312 u32 supp[3]; 3313 3314 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 3315 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0; 3316 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1; 3317 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2; 3318 3319 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]); 3320 if (status) 3321 goto out; 3322 } 3323 3324 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3325 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 3326 status = nfsd4_encode_security_label(xdr, rqstp, context, 3327 contextlen); 3328 if (status) 3329 goto out; 3330 } 3331 #endif 3332 3333 if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) { 3334 p = xdr_reserve_space(xdr, 4); 3335 if (!p) 3336 goto out_resource; 3337 err = xattr_supported_namespace(d_inode(dentry), 3338 XATTR_USER_PREFIX); 3339 *p++ = cpu_to_be32(err == 0); 3340 } 3341 3342 attrlen = htonl(xdr->buf->len - attrlen_offset - 4); 3343 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4); 3344 status = nfs_ok; 3345 3346 out: 3347 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3348 if (context) 3349 security_release_secctx(context, contextlen); 3350 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 3351 kfree(acl); 3352 if (tempfh) { 3353 fh_put(tempfh); 3354 kfree(tempfh); 3355 } 3356 if (status) 3357 xdr_truncate_encode(xdr, starting_len); 3358 return status; 3359 out_nfserr: 3360 status = nfserrno(err); 3361 goto out; 3362 out_resource: 3363 status = nfserr_resource; 3364 goto out; 3365 } 3366 3367 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, 3368 struct xdr_buf *buf, __be32 *p, int bytes) 3369 { 3370 xdr->scratch.iov_len = 0; 3371 memset(buf, 0, sizeof(struct xdr_buf)); 3372 buf->head[0].iov_base = p; 3373 buf->head[0].iov_len = 0; 3374 buf->len = 0; 3375 xdr->buf = buf; 3376 xdr->iov = buf->head; 3377 xdr->p = p; 3378 xdr->end = (void *)p + bytes; 3379 buf->buflen = bytes; 3380 } 3381 3382 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, 3383 struct svc_fh *fhp, struct svc_export *exp, 3384 struct dentry *dentry, u32 *bmval, 3385 struct svc_rqst *rqstp, int ignore_crossmnt) 3386 { 3387 struct xdr_buf dummy; 3388 struct xdr_stream xdr; 3389 __be32 ret; 3390 3391 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); 3392 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp, 3393 ignore_crossmnt); 3394 *p = xdr.p; 3395 return ret; 3396 } 3397 3398 static inline int attributes_need_mount(u32 *bmval) 3399 { 3400 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) 3401 return 1; 3402 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) 3403 return 1; 3404 return 0; 3405 } 3406 3407 static __be32 3408 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd, 3409 const char *name, int namlen) 3410 { 3411 struct svc_export *exp = cd->rd_fhp->fh_export; 3412 struct dentry *dentry; 3413 __be32 nfserr; 3414 int ignore_crossmnt = 0; 3415 3416 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen); 3417 if (IS_ERR(dentry)) 3418 return nfserrno(PTR_ERR(dentry)); 3419 3420 exp_get(exp); 3421 /* 3422 * In the case of a mountpoint, the client may be asking for 3423 * attributes that are only properties of the underlying filesystem 3424 * as opposed to the cross-mounted file system. In such a case, 3425 * we will not follow the cross mount and will fill the attribtutes 3426 * directly from the mountpoint dentry. 3427 */ 3428 if (nfsd_mountpoint(dentry, exp)) { 3429 int err; 3430 3431 if (!(exp->ex_flags & NFSEXP_V4ROOT) 3432 && !attributes_need_mount(cd->rd_bmval)) { 3433 ignore_crossmnt = 1; 3434 goto out_encode; 3435 } 3436 /* 3437 * Why the heck aren't we just using nfsd_lookup?? 3438 * Different "."/".." handling? Something else? 3439 * At least, add a comment here to explain.... 3440 */ 3441 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); 3442 if (err) { 3443 nfserr = nfserrno(err); 3444 goto out_put; 3445 } 3446 nfserr = check_nfsd_access(exp, cd->rd_rqstp); 3447 if (nfserr) 3448 goto out_put; 3449 3450 } 3451 out_encode: 3452 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval, 3453 cd->rd_rqstp, ignore_crossmnt); 3454 out_put: 3455 dput(dentry); 3456 exp_put(exp); 3457 return nfserr; 3458 } 3459 3460 static __be32 * 3461 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr) 3462 { 3463 __be32 *p; 3464 3465 p = xdr_reserve_space(xdr, 20); 3466 if (!p) 3467 return NULL; 3468 *p++ = htonl(2); 3469 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ 3470 *p++ = htonl(0); /* bmval1 */ 3471 3472 *p++ = htonl(4); /* attribute length */ 3473 *p++ = nfserr; /* no htonl */ 3474 return p; 3475 } 3476 3477 static int 3478 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen, 3479 loff_t offset, u64 ino, unsigned int d_type) 3480 { 3481 struct readdir_cd *ccd = ccdv; 3482 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 3483 struct xdr_stream *xdr = cd->xdr; 3484 int start_offset = xdr->buf->len; 3485 int cookie_offset; 3486 u32 name_and_cookie; 3487 int entry_bytes; 3488 __be32 nfserr = nfserr_toosmall; 3489 __be64 wire_offset; 3490 __be32 *p; 3491 3492 /* In nfsv4, "." and ".." never make it onto the wire.. */ 3493 if (name && isdotent(name, namlen)) { 3494 cd->common.err = nfs_ok; 3495 return 0; 3496 } 3497 3498 if (cd->cookie_offset) { 3499 wire_offset = cpu_to_be64(offset); 3500 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset, 3501 &wire_offset, 8); 3502 } 3503 3504 p = xdr_reserve_space(xdr, 4); 3505 if (!p) 3506 goto fail; 3507 *p++ = xdr_one; /* mark entry present */ 3508 cookie_offset = xdr->buf->len; 3509 p = xdr_reserve_space(xdr, 3*4 + namlen); 3510 if (!p) 3511 goto fail; 3512 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */ 3513 p = xdr_encode_array(p, name, namlen); /* name length & name */ 3514 3515 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen); 3516 switch (nfserr) { 3517 case nfs_ok: 3518 break; 3519 case nfserr_resource: 3520 nfserr = nfserr_toosmall; 3521 goto fail; 3522 case nfserr_noent: 3523 xdr_truncate_encode(xdr, start_offset); 3524 goto skip_entry; 3525 default: 3526 /* 3527 * If the client requested the RDATTR_ERROR attribute, 3528 * we stuff the error code into this attribute 3529 * and continue. If this attribute was not requested, 3530 * then in accordance with the spec, we fail the 3531 * entire READDIR operation(!) 3532 */ 3533 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 3534 goto fail; 3535 p = nfsd4_encode_rdattr_error(xdr, nfserr); 3536 if (p == NULL) { 3537 nfserr = nfserr_toosmall; 3538 goto fail; 3539 } 3540 } 3541 nfserr = nfserr_toosmall; 3542 entry_bytes = xdr->buf->len - start_offset; 3543 if (entry_bytes > cd->rd_maxcount) 3544 goto fail; 3545 cd->rd_maxcount -= entry_bytes; 3546 /* 3547 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and 3548 * notes that it could be zero. If it is zero, then the server 3549 * should enforce only the rd_maxcount value. 3550 */ 3551 if (cd->rd_dircount) { 3552 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8; 3553 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset) 3554 goto fail; 3555 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie); 3556 if (!cd->rd_dircount) 3557 cd->rd_maxcount = 0; 3558 } 3559 3560 cd->cookie_offset = cookie_offset; 3561 skip_entry: 3562 cd->common.err = nfs_ok; 3563 return 0; 3564 fail: 3565 xdr_truncate_encode(xdr, start_offset); 3566 cd->common.err = nfserr; 3567 return -EINVAL; 3568 } 3569 3570 static __be32 3571 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid) 3572 { 3573 __be32 *p; 3574 3575 p = xdr_reserve_space(xdr, sizeof(stateid_t)); 3576 if (!p) 3577 return nfserr_resource; 3578 *p++ = cpu_to_be32(sid->si_generation); 3579 p = xdr_encode_opaque_fixed(p, &sid->si_opaque, 3580 sizeof(stateid_opaque_t)); 3581 return 0; 3582 } 3583 3584 static __be32 3585 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access) 3586 { 3587 struct xdr_stream *xdr = resp->xdr; 3588 __be32 *p; 3589 3590 p = xdr_reserve_space(xdr, 8); 3591 if (!p) 3592 return nfserr_resource; 3593 *p++ = cpu_to_be32(access->ac_supported); 3594 *p++ = cpu_to_be32(access->ac_resp_access); 3595 return 0; 3596 } 3597 3598 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts) 3599 { 3600 struct xdr_stream *xdr = resp->xdr; 3601 __be32 *p; 3602 3603 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8); 3604 if (!p) 3605 return nfserr_resource; 3606 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data, 3607 NFS4_MAX_SESSIONID_LEN); 3608 *p++ = cpu_to_be32(bcts->dir); 3609 /* Upshifting from TCP to RDMA is not supported */ 3610 *p++ = cpu_to_be32(0); 3611 return 0; 3612 } 3613 3614 static __be32 3615 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close) 3616 { 3617 struct xdr_stream *xdr = resp->xdr; 3618 3619 return nfsd4_encode_stateid(xdr, &close->cl_stateid); 3620 } 3621 3622 3623 static __be32 3624 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit) 3625 { 3626 struct xdr_stream *xdr = resp->xdr; 3627 __be32 *p; 3628 3629 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3630 if (!p) 3631 return nfserr_resource; 3632 p = xdr_encode_opaque_fixed(p, commit->co_verf.data, 3633 NFS4_VERIFIER_SIZE); 3634 return 0; 3635 } 3636 3637 static __be32 3638 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create) 3639 { 3640 struct xdr_stream *xdr = resp->xdr; 3641 __be32 *p; 3642 3643 p = xdr_reserve_space(xdr, 20); 3644 if (!p) 3645 return nfserr_resource; 3646 encode_cinfo(p, &create->cr_cinfo); 3647 return nfsd4_encode_bitmap(xdr, create->cr_bmval[0], 3648 create->cr_bmval[1], create->cr_bmval[2]); 3649 } 3650 3651 static __be32 3652 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr) 3653 { 3654 struct svc_fh *fhp = getattr->ga_fhp; 3655 struct xdr_stream *xdr = resp->xdr; 3656 3657 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry, 3658 getattr->ga_bmval, resp->rqstp, 0); 3659 } 3660 3661 static __be32 3662 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp) 3663 { 3664 struct xdr_stream *xdr = resp->xdr; 3665 struct svc_fh *fhp = *fhpp; 3666 unsigned int len; 3667 __be32 *p; 3668 3669 len = fhp->fh_handle.fh_size; 3670 p = xdr_reserve_space(xdr, len + 4); 3671 if (!p) 3672 return nfserr_resource; 3673 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len); 3674 return 0; 3675 } 3676 3677 /* 3678 * Including all fields other than the name, a LOCK4denied structure requires 3679 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. 3680 */ 3681 static __be32 3682 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld) 3683 { 3684 struct xdr_netobj *conf = &ld->ld_owner; 3685 __be32 *p; 3686 3687 again: 3688 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len)); 3689 if (!p) { 3690 /* 3691 * Don't fail to return the result just because we can't 3692 * return the conflicting open: 3693 */ 3694 if (conf->len) { 3695 kfree(conf->data); 3696 conf->len = 0; 3697 conf->data = NULL; 3698 goto again; 3699 } 3700 return nfserr_resource; 3701 } 3702 p = xdr_encode_hyper(p, ld->ld_start); 3703 p = xdr_encode_hyper(p, ld->ld_length); 3704 *p++ = cpu_to_be32(ld->ld_type); 3705 if (conf->len) { 3706 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8); 3707 p = xdr_encode_opaque(p, conf->data, conf->len); 3708 kfree(conf->data); 3709 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ 3710 p = xdr_encode_hyper(p, (u64)0); /* clientid */ 3711 *p++ = cpu_to_be32(0); /* length of owner name */ 3712 } 3713 return nfserr_denied; 3714 } 3715 3716 static __be32 3717 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock) 3718 { 3719 struct xdr_stream *xdr = resp->xdr; 3720 3721 if (!nfserr) 3722 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid); 3723 else if (nfserr == nfserr_denied) 3724 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied); 3725 3726 return nfserr; 3727 } 3728 3729 static __be32 3730 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt) 3731 { 3732 struct xdr_stream *xdr = resp->xdr; 3733 3734 if (nfserr == nfserr_denied) 3735 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied); 3736 return nfserr; 3737 } 3738 3739 static __be32 3740 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku) 3741 { 3742 struct xdr_stream *xdr = resp->xdr; 3743 3744 return nfsd4_encode_stateid(xdr, &locku->lu_stateid); 3745 } 3746 3747 3748 static __be32 3749 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link) 3750 { 3751 struct xdr_stream *xdr = resp->xdr; 3752 __be32 *p; 3753 3754 p = xdr_reserve_space(xdr, 20); 3755 if (!p) 3756 return nfserr_resource; 3757 p = encode_cinfo(p, &link->li_cinfo); 3758 return 0; 3759 } 3760 3761 3762 static __be32 3763 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open) 3764 { 3765 struct xdr_stream *xdr = resp->xdr; 3766 __be32 *p; 3767 3768 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid); 3769 if (nfserr) 3770 return nfserr; 3771 p = xdr_reserve_space(xdr, 24); 3772 if (!p) 3773 return nfserr_resource; 3774 p = encode_cinfo(p, &open->op_cinfo); 3775 *p++ = cpu_to_be32(open->op_rflags); 3776 3777 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1], 3778 open->op_bmval[2]); 3779 if (nfserr) 3780 return nfserr; 3781 3782 p = xdr_reserve_space(xdr, 4); 3783 if (!p) 3784 return nfserr_resource; 3785 3786 *p++ = cpu_to_be32(open->op_delegate_type); 3787 switch (open->op_delegate_type) { 3788 case NFS4_OPEN_DELEGATE_NONE: 3789 break; 3790 case NFS4_OPEN_DELEGATE_READ: 3791 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3792 if (nfserr) 3793 return nfserr; 3794 p = xdr_reserve_space(xdr, 20); 3795 if (!p) 3796 return nfserr_resource; 3797 *p++ = cpu_to_be32(open->op_recall); 3798 3799 /* 3800 * TODO: ACE's in delegations 3801 */ 3802 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3803 *p++ = cpu_to_be32(0); 3804 *p++ = cpu_to_be32(0); 3805 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3806 break; 3807 case NFS4_OPEN_DELEGATE_WRITE: 3808 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3809 if (nfserr) 3810 return nfserr; 3811 p = xdr_reserve_space(xdr, 32); 3812 if (!p) 3813 return nfserr_resource; 3814 *p++ = cpu_to_be32(0); 3815 3816 /* 3817 * TODO: space_limit's in delegations 3818 */ 3819 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE); 3820 *p++ = cpu_to_be32(~(u32)0); 3821 *p++ = cpu_to_be32(~(u32)0); 3822 3823 /* 3824 * TODO: ACE's in delegations 3825 */ 3826 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3827 *p++ = cpu_to_be32(0); 3828 *p++ = cpu_to_be32(0); 3829 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3830 break; 3831 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */ 3832 switch (open->op_why_no_deleg) { 3833 case WND4_CONTENTION: 3834 case WND4_RESOURCE: 3835 p = xdr_reserve_space(xdr, 8); 3836 if (!p) 3837 return nfserr_resource; 3838 *p++ = cpu_to_be32(open->op_why_no_deleg); 3839 /* deleg signaling not supported yet: */ 3840 *p++ = cpu_to_be32(0); 3841 break; 3842 default: 3843 p = xdr_reserve_space(xdr, 4); 3844 if (!p) 3845 return nfserr_resource; 3846 *p++ = cpu_to_be32(open->op_why_no_deleg); 3847 } 3848 break; 3849 default: 3850 BUG(); 3851 } 3852 /* XXX save filehandle here */ 3853 return 0; 3854 } 3855 3856 static __be32 3857 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc) 3858 { 3859 struct xdr_stream *xdr = resp->xdr; 3860 3861 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid); 3862 } 3863 3864 static __be32 3865 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od) 3866 { 3867 struct xdr_stream *xdr = resp->xdr; 3868 3869 return nfsd4_encode_stateid(xdr, &od->od_stateid); 3870 } 3871 3872 static __be32 nfsd4_encode_splice_read( 3873 struct nfsd4_compoundres *resp, 3874 struct nfsd4_read *read, 3875 struct file *file, unsigned long maxcount) 3876 { 3877 struct xdr_stream *xdr = resp->xdr; 3878 struct xdr_buf *buf = xdr->buf; 3879 int status, space_left; 3880 u32 eof; 3881 __be32 nfserr; 3882 __be32 *p = xdr->p - 2; 3883 3884 /* Make sure there will be room for padding if needed */ 3885 if (xdr->end - xdr->p < 1) 3886 return nfserr_resource; 3887 3888 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp, 3889 file, read->rd_offset, &maxcount, &eof); 3890 read->rd_length = maxcount; 3891 if (nfserr) 3892 goto out_err; 3893 status = svc_encode_result_payload(read->rd_rqstp, 3894 buf->head[0].iov_len, maxcount); 3895 if (status) { 3896 nfserr = nfserrno(status); 3897 goto out_err; 3898 } 3899 3900 *(p++) = htonl(eof); 3901 *(p++) = htonl(maxcount); 3902 3903 buf->page_len = maxcount; 3904 buf->len += maxcount; 3905 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1) 3906 / PAGE_SIZE; 3907 3908 /* Use rest of head for padding and remaining ops: */ 3909 buf->tail[0].iov_base = xdr->p; 3910 buf->tail[0].iov_len = 0; 3911 xdr->iov = buf->tail; 3912 if (maxcount&3) { 3913 int pad = 4 - (maxcount&3); 3914 3915 *(xdr->p++) = 0; 3916 3917 buf->tail[0].iov_base += maxcount&3; 3918 buf->tail[0].iov_len = pad; 3919 buf->len += pad; 3920 } 3921 3922 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p, 3923 buf->buflen - buf->len); 3924 buf->buflen = buf->len + space_left; 3925 xdr->end = (__be32 *)((void *)xdr->end + space_left); 3926 3927 return 0; 3928 3929 out_err: 3930 /* 3931 * nfsd_splice_actor may have already messed with the 3932 * page length; reset it so as not to confuse 3933 * xdr_truncate_encode in our caller. 3934 */ 3935 buf->page_len = 0; 3936 return nfserr; 3937 } 3938 3939 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, 3940 struct nfsd4_read *read, 3941 struct file *file, unsigned long maxcount) 3942 { 3943 struct xdr_stream *xdr = resp->xdr; 3944 u32 eof; 3945 int starting_len = xdr->buf->len - 8; 3946 __be32 nfserr; 3947 __be32 tmp; 3948 int pad; 3949 3950 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount); 3951 if (read->rd_vlen < 0) 3952 return nfserr_resource; 3953 3954 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset, 3955 resp->rqstp->rq_vec, read->rd_vlen, &maxcount, 3956 &eof); 3957 read->rd_length = maxcount; 3958 if (nfserr) 3959 return nfserr; 3960 if (svc_encode_result_payload(resp->rqstp, starting_len + 8, maxcount)) 3961 return nfserr_io; 3962 xdr_truncate_encode(xdr, starting_len + 8 + xdr_align_size(maxcount)); 3963 3964 tmp = htonl(eof); 3965 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4); 3966 tmp = htonl(maxcount); 3967 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4); 3968 3969 tmp = xdr_zero; 3970 pad = (maxcount&3) ? 4 - (maxcount&3) : 0; 3971 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount, 3972 &tmp, pad); 3973 return 0; 3974 3975 } 3976 3977 static __be32 3978 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 3979 struct nfsd4_read *read) 3980 { 3981 unsigned long maxcount; 3982 struct xdr_stream *xdr = resp->xdr; 3983 struct file *file; 3984 int starting_len = xdr->buf->len; 3985 __be32 *p; 3986 3987 if (nfserr) 3988 return nfserr; 3989 file = read->rd_nf->nf_file; 3990 3991 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ 3992 if (!p) { 3993 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)); 3994 return nfserr_resource; 3995 } 3996 if (resp->xdr->buf->page_len && 3997 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) { 3998 WARN_ON_ONCE(1); 3999 return nfserr_resource; 4000 } 4001 xdr_commit_encode(xdr); 4002 4003 maxcount = svc_max_payload(resp->rqstp); 4004 maxcount = min_t(unsigned long, maxcount, 4005 (xdr->buf->buflen - xdr->buf->len)); 4006 maxcount = min_t(unsigned long, maxcount, read->rd_length); 4007 4008 if (file->f_op->splice_read && 4009 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) 4010 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 4011 else 4012 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 4013 4014 if (nfserr) 4015 xdr_truncate_encode(xdr, starting_len); 4016 4017 return nfserr; 4018 } 4019 4020 static __be32 4021 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink) 4022 { 4023 int maxcount; 4024 __be32 wire_count; 4025 int zero = 0; 4026 struct xdr_stream *xdr = resp->xdr; 4027 int length_offset = xdr->buf->len; 4028 int status; 4029 __be32 *p; 4030 4031 p = xdr_reserve_space(xdr, 4); 4032 if (!p) 4033 return nfserr_resource; 4034 maxcount = PAGE_SIZE; 4035 4036 p = xdr_reserve_space(xdr, maxcount); 4037 if (!p) 4038 return nfserr_resource; 4039 /* 4040 * XXX: By default, vfs_readlink() will truncate symlinks if they 4041 * would overflow the buffer. Is this kosher in NFSv4? If not, one 4042 * easy fix is: if vfs_readlink() precisely fills the buffer, assume 4043 * that truncation occurred, and return NFS4ERR_RESOURCE. 4044 */ 4045 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, 4046 (char *)p, &maxcount); 4047 if (nfserr == nfserr_isdir) 4048 nfserr = nfserr_inval; 4049 if (nfserr) 4050 goto out_err; 4051 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset, 4052 maxcount); 4053 if (status) { 4054 nfserr = nfserrno(status); 4055 goto out_err; 4056 } 4057 4058 wire_count = htonl(maxcount); 4059 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4); 4060 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4)); 4061 if (maxcount & 3) 4062 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, 4063 &zero, 4 - (maxcount&3)); 4064 return 0; 4065 4066 out_err: 4067 xdr_truncate_encode(xdr, length_offset); 4068 return nfserr; 4069 } 4070 4071 static __be32 4072 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir) 4073 { 4074 int maxcount; 4075 int bytes_left; 4076 loff_t offset; 4077 __be64 wire_offset; 4078 struct xdr_stream *xdr = resp->xdr; 4079 int starting_len = xdr->buf->len; 4080 __be32 *p; 4081 4082 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 4083 if (!p) 4084 return nfserr_resource; 4085 4086 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ 4087 *p++ = cpu_to_be32(0); 4088 *p++ = cpu_to_be32(0); 4089 xdr->buf->head[0].iov_len = (char *)xdr->p - 4090 (char *)xdr->buf->head[0].iov_base; 4091 4092 /* 4093 * Number of bytes left for directory entries allowing for the 4094 * final 8 bytes of the readdir and a following failed op: 4095 */ 4096 bytes_left = xdr->buf->buflen - xdr->buf->len 4097 - COMPOUND_ERR_SLACK_SPACE - 8; 4098 if (bytes_left < 0) { 4099 nfserr = nfserr_resource; 4100 goto err_no_verf; 4101 } 4102 maxcount = svc_max_payload(resp->rqstp); 4103 maxcount = min_t(u32, readdir->rd_maxcount, maxcount); 4104 /* 4105 * Note the rfc defines rd_maxcount as the size of the 4106 * READDIR4resok structure, which includes the verifier above 4107 * and the 8 bytes encoded at the end of this function: 4108 */ 4109 if (maxcount < 16) { 4110 nfserr = nfserr_toosmall; 4111 goto err_no_verf; 4112 } 4113 maxcount = min_t(int, maxcount-16, bytes_left); 4114 4115 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */ 4116 if (!readdir->rd_dircount) 4117 readdir->rd_dircount = svc_max_payload(resp->rqstp); 4118 4119 readdir->xdr = xdr; 4120 readdir->rd_maxcount = maxcount; 4121 readdir->common.err = 0; 4122 readdir->cookie_offset = 0; 4123 4124 offset = readdir->rd_cookie; 4125 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, 4126 &offset, 4127 &readdir->common, nfsd4_encode_dirent); 4128 if (nfserr == nfs_ok && 4129 readdir->common.err == nfserr_toosmall && 4130 xdr->buf->len == starting_len + 8) { 4131 /* nothing encoded; which limit did we hit?: */ 4132 if (maxcount - 16 < bytes_left) 4133 /* It was the fault of rd_maxcount: */ 4134 nfserr = nfserr_toosmall; 4135 else 4136 /* We ran out of buffer space: */ 4137 nfserr = nfserr_resource; 4138 } 4139 if (nfserr) 4140 goto err_no_verf; 4141 4142 if (readdir->cookie_offset) { 4143 wire_offset = cpu_to_be64(offset); 4144 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, 4145 &wire_offset, 8); 4146 } 4147 4148 p = xdr_reserve_space(xdr, 8); 4149 if (!p) { 4150 WARN_ON_ONCE(1); 4151 goto err_no_verf; 4152 } 4153 *p++ = 0; /* no more entries */ 4154 *p++ = htonl(readdir->common.err == nfserr_eof); 4155 4156 return 0; 4157 err_no_verf: 4158 xdr_truncate_encode(xdr, starting_len); 4159 return nfserr; 4160 } 4161 4162 static __be32 4163 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove) 4164 { 4165 struct xdr_stream *xdr = resp->xdr; 4166 __be32 *p; 4167 4168 p = xdr_reserve_space(xdr, 20); 4169 if (!p) 4170 return nfserr_resource; 4171 p = encode_cinfo(p, &remove->rm_cinfo); 4172 return 0; 4173 } 4174 4175 static __be32 4176 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename) 4177 { 4178 struct xdr_stream *xdr = resp->xdr; 4179 __be32 *p; 4180 4181 p = xdr_reserve_space(xdr, 40); 4182 if (!p) 4183 return nfserr_resource; 4184 p = encode_cinfo(p, &rename->rn_sinfo); 4185 p = encode_cinfo(p, &rename->rn_tinfo); 4186 return 0; 4187 } 4188 4189 static __be32 4190 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp) 4191 { 4192 u32 i, nflavs, supported; 4193 struct exp_flavor_info *flavs; 4194 struct exp_flavor_info def_flavs[2]; 4195 __be32 *p, *flavorsp; 4196 static bool report = true; 4197 4198 if (exp->ex_nflavors) { 4199 flavs = exp->ex_flavors; 4200 nflavs = exp->ex_nflavors; 4201 } else { /* Handling of some defaults in absence of real secinfo: */ 4202 flavs = def_flavs; 4203 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { 4204 nflavs = 2; 4205 flavs[0].pseudoflavor = RPC_AUTH_UNIX; 4206 flavs[1].pseudoflavor = RPC_AUTH_NULL; 4207 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { 4208 nflavs = 1; 4209 flavs[0].pseudoflavor 4210 = svcauth_gss_flavor(exp->ex_client); 4211 } else { 4212 nflavs = 1; 4213 flavs[0].pseudoflavor 4214 = exp->ex_client->flavour->flavour; 4215 } 4216 } 4217 4218 supported = 0; 4219 p = xdr_reserve_space(xdr, 4); 4220 if (!p) 4221 return nfserr_resource; 4222 flavorsp = p++; /* to be backfilled later */ 4223 4224 for (i = 0; i < nflavs; i++) { 4225 rpc_authflavor_t pf = flavs[i].pseudoflavor; 4226 struct rpcsec_gss_info info; 4227 4228 if (rpcauth_get_gssinfo(pf, &info) == 0) { 4229 supported++; 4230 p = xdr_reserve_space(xdr, 4 + 4 + 4231 XDR_LEN(info.oid.len) + 4 + 4); 4232 if (!p) 4233 return nfserr_resource; 4234 *p++ = cpu_to_be32(RPC_AUTH_GSS); 4235 p = xdr_encode_opaque(p, info.oid.data, info.oid.len); 4236 *p++ = cpu_to_be32(info.qop); 4237 *p++ = cpu_to_be32(info.service); 4238 } else if (pf < RPC_AUTH_MAXFLAVOR) { 4239 supported++; 4240 p = xdr_reserve_space(xdr, 4); 4241 if (!p) 4242 return nfserr_resource; 4243 *p++ = cpu_to_be32(pf); 4244 } else { 4245 if (report) 4246 pr_warn("NFS: SECINFO: security flavor %u " 4247 "is not supported\n", pf); 4248 } 4249 } 4250 4251 if (nflavs != supported) 4252 report = false; 4253 *flavorsp = htonl(supported); 4254 return 0; 4255 } 4256 4257 static __be32 4258 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4259 struct nfsd4_secinfo *secinfo) 4260 { 4261 struct xdr_stream *xdr = resp->xdr; 4262 4263 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp); 4264 } 4265 4266 static __be32 4267 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, 4268 struct nfsd4_secinfo_no_name *secinfo) 4269 { 4270 struct xdr_stream *xdr = resp->xdr; 4271 4272 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp); 4273 } 4274 4275 /* 4276 * The SETATTR encode routine is special -- it always encodes a bitmap, 4277 * regardless of the error status. 4278 */ 4279 static __be32 4280 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr) 4281 { 4282 struct xdr_stream *xdr = resp->xdr; 4283 __be32 *p; 4284 4285 p = xdr_reserve_space(xdr, 16); 4286 if (!p) 4287 return nfserr_resource; 4288 if (nfserr) { 4289 *p++ = cpu_to_be32(3); 4290 *p++ = cpu_to_be32(0); 4291 *p++ = cpu_to_be32(0); 4292 *p++ = cpu_to_be32(0); 4293 } 4294 else { 4295 *p++ = cpu_to_be32(3); 4296 *p++ = cpu_to_be32(setattr->sa_bmval[0]); 4297 *p++ = cpu_to_be32(setattr->sa_bmval[1]); 4298 *p++ = cpu_to_be32(setattr->sa_bmval[2]); 4299 } 4300 return nfserr; 4301 } 4302 4303 static __be32 4304 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd) 4305 { 4306 struct xdr_stream *xdr = resp->xdr; 4307 __be32 *p; 4308 4309 if (!nfserr) { 4310 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE); 4311 if (!p) 4312 return nfserr_resource; 4313 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8); 4314 p = xdr_encode_opaque_fixed(p, &scd->se_confirm, 4315 NFS4_VERIFIER_SIZE); 4316 } 4317 else if (nfserr == nfserr_clid_inuse) { 4318 p = xdr_reserve_space(xdr, 8); 4319 if (!p) 4320 return nfserr_resource; 4321 *p++ = cpu_to_be32(0); 4322 *p++ = cpu_to_be32(0); 4323 } 4324 return nfserr; 4325 } 4326 4327 static __be32 4328 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write) 4329 { 4330 struct xdr_stream *xdr = resp->xdr; 4331 __be32 *p; 4332 4333 p = xdr_reserve_space(xdr, 16); 4334 if (!p) 4335 return nfserr_resource; 4336 *p++ = cpu_to_be32(write->wr_bytes_written); 4337 *p++ = cpu_to_be32(write->wr_how_written); 4338 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4339 NFS4_VERIFIER_SIZE); 4340 return 0; 4341 } 4342 4343 static __be32 4344 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, 4345 struct nfsd4_exchange_id *exid) 4346 { 4347 struct xdr_stream *xdr = resp->xdr; 4348 __be32 *p; 4349 char *major_id; 4350 char *server_scope; 4351 int major_id_sz; 4352 int server_scope_sz; 4353 uint64_t minor_id = 0; 4354 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id); 4355 4356 major_id = nn->nfsd_name; 4357 major_id_sz = strlen(nn->nfsd_name); 4358 server_scope = nn->nfsd_name; 4359 server_scope_sz = strlen(nn->nfsd_name); 4360 4361 p = xdr_reserve_space(xdr, 4362 8 /* eir_clientid */ + 4363 4 /* eir_sequenceid */ + 4364 4 /* eir_flags */ + 4365 4 /* spr_how */); 4366 if (!p) 4367 return nfserr_resource; 4368 4369 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8); 4370 *p++ = cpu_to_be32(exid->seqid); 4371 *p++ = cpu_to_be32(exid->flags); 4372 4373 *p++ = cpu_to_be32(exid->spa_how); 4374 4375 switch (exid->spa_how) { 4376 case SP4_NONE: 4377 break; 4378 case SP4_MACH_CRED: 4379 /* spo_must_enforce bitmap: */ 4380 nfserr = nfsd4_encode_bitmap(xdr, 4381 exid->spo_must_enforce[0], 4382 exid->spo_must_enforce[1], 4383 exid->spo_must_enforce[2]); 4384 if (nfserr) 4385 return nfserr; 4386 /* spo_must_allow bitmap: */ 4387 nfserr = nfsd4_encode_bitmap(xdr, 4388 exid->spo_must_allow[0], 4389 exid->spo_must_allow[1], 4390 exid->spo_must_allow[2]); 4391 if (nfserr) 4392 return nfserr; 4393 break; 4394 default: 4395 WARN_ON_ONCE(1); 4396 } 4397 4398 p = xdr_reserve_space(xdr, 4399 8 /* so_minor_id */ + 4400 4 /* so_major_id.len */ + 4401 (XDR_QUADLEN(major_id_sz) * 4) + 4402 4 /* eir_server_scope.len */ + 4403 (XDR_QUADLEN(server_scope_sz) * 4) + 4404 4 /* eir_server_impl_id.count (0) */); 4405 if (!p) 4406 return nfserr_resource; 4407 4408 /* The server_owner struct */ 4409 p = xdr_encode_hyper(p, minor_id); /* Minor id */ 4410 /* major id */ 4411 p = xdr_encode_opaque(p, major_id, major_id_sz); 4412 4413 /* Server scope */ 4414 p = xdr_encode_opaque(p, server_scope, server_scope_sz); 4415 4416 /* Implementation id */ 4417 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */ 4418 return 0; 4419 } 4420 4421 static __be32 4422 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, 4423 struct nfsd4_create_session *sess) 4424 { 4425 struct xdr_stream *xdr = resp->xdr; 4426 __be32 *p; 4427 4428 p = xdr_reserve_space(xdr, 24); 4429 if (!p) 4430 return nfserr_resource; 4431 p = xdr_encode_opaque_fixed(p, sess->sessionid.data, 4432 NFS4_MAX_SESSIONID_LEN); 4433 *p++ = cpu_to_be32(sess->seqid); 4434 *p++ = cpu_to_be32(sess->flags); 4435 4436 p = xdr_reserve_space(xdr, 28); 4437 if (!p) 4438 return nfserr_resource; 4439 *p++ = cpu_to_be32(0); /* headerpadsz */ 4440 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz); 4441 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz); 4442 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached); 4443 *p++ = cpu_to_be32(sess->fore_channel.maxops); 4444 *p++ = cpu_to_be32(sess->fore_channel.maxreqs); 4445 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs); 4446 4447 if (sess->fore_channel.nr_rdma_attrs) { 4448 p = xdr_reserve_space(xdr, 4); 4449 if (!p) 4450 return nfserr_resource; 4451 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs); 4452 } 4453 4454 p = xdr_reserve_space(xdr, 28); 4455 if (!p) 4456 return nfserr_resource; 4457 *p++ = cpu_to_be32(0); /* headerpadsz */ 4458 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz); 4459 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz); 4460 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached); 4461 *p++ = cpu_to_be32(sess->back_channel.maxops); 4462 *p++ = cpu_to_be32(sess->back_channel.maxreqs); 4463 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs); 4464 4465 if (sess->back_channel.nr_rdma_attrs) { 4466 p = xdr_reserve_space(xdr, 4); 4467 if (!p) 4468 return nfserr_resource; 4469 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs); 4470 } 4471 return 0; 4472 } 4473 4474 static __be32 4475 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, 4476 struct nfsd4_sequence *seq) 4477 { 4478 struct xdr_stream *xdr = resp->xdr; 4479 __be32 *p; 4480 4481 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20); 4482 if (!p) 4483 return nfserr_resource; 4484 p = xdr_encode_opaque_fixed(p, seq->sessionid.data, 4485 NFS4_MAX_SESSIONID_LEN); 4486 *p++ = cpu_to_be32(seq->seqid); 4487 *p++ = cpu_to_be32(seq->slotid); 4488 /* Note slotid's are numbered from zero: */ 4489 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */ 4490 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */ 4491 *p++ = cpu_to_be32(seq->status_flags); 4492 4493 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */ 4494 return 0; 4495 } 4496 4497 static __be32 4498 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, 4499 struct nfsd4_test_stateid *test_stateid) 4500 { 4501 struct xdr_stream *xdr = resp->xdr; 4502 struct nfsd4_test_stateid_id *stateid, *next; 4503 __be32 *p; 4504 4505 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids)); 4506 if (!p) 4507 return nfserr_resource; 4508 *p++ = htonl(test_stateid->ts_num_ids); 4509 4510 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) { 4511 *p++ = stateid->ts_id_status; 4512 } 4513 4514 return 0; 4515 } 4516 4517 #ifdef CONFIG_NFSD_PNFS 4518 static __be32 4519 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4520 struct nfsd4_getdeviceinfo *gdev) 4521 { 4522 struct xdr_stream *xdr = resp->xdr; 4523 const struct nfsd4_layout_ops *ops; 4524 u32 starting_len = xdr->buf->len, needed_len; 4525 __be32 *p; 4526 4527 p = xdr_reserve_space(xdr, 4); 4528 if (!p) 4529 return nfserr_resource; 4530 4531 *p++ = cpu_to_be32(gdev->gd_layout_type); 4532 4533 /* If maxcount is 0 then just update notifications */ 4534 if (gdev->gd_maxcount != 0) { 4535 ops = nfsd4_layout_ops[gdev->gd_layout_type]; 4536 nfserr = ops->encode_getdeviceinfo(xdr, gdev); 4537 if (nfserr) { 4538 /* 4539 * We don't bother to burden the layout drivers with 4540 * enforcing gd_maxcount, just tell the client to 4541 * come back with a bigger buffer if it's not enough. 4542 */ 4543 if (xdr->buf->len + 4 > gdev->gd_maxcount) 4544 goto toosmall; 4545 return nfserr; 4546 } 4547 } 4548 4549 if (gdev->gd_notify_types) { 4550 p = xdr_reserve_space(xdr, 4 + 4); 4551 if (!p) 4552 return nfserr_resource; 4553 *p++ = cpu_to_be32(1); /* bitmap length */ 4554 *p++ = cpu_to_be32(gdev->gd_notify_types); 4555 } else { 4556 p = xdr_reserve_space(xdr, 4); 4557 if (!p) 4558 return nfserr_resource; 4559 *p++ = 0; 4560 } 4561 4562 return 0; 4563 toosmall: 4564 dprintk("%s: maxcount too small\n", __func__); 4565 needed_len = xdr->buf->len + 4 /* notifications */; 4566 xdr_truncate_encode(xdr, starting_len); 4567 p = xdr_reserve_space(xdr, 4); 4568 if (!p) 4569 return nfserr_resource; 4570 *p++ = cpu_to_be32(needed_len); 4571 return nfserr_toosmall; 4572 } 4573 4574 static __be32 4575 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, 4576 struct nfsd4_layoutget *lgp) 4577 { 4578 struct xdr_stream *xdr = resp->xdr; 4579 const struct nfsd4_layout_ops *ops; 4580 __be32 *p; 4581 4582 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t)); 4583 if (!p) 4584 return nfserr_resource; 4585 4586 *p++ = cpu_to_be32(1); /* we always set return-on-close */ 4587 *p++ = cpu_to_be32(lgp->lg_sid.si_generation); 4588 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque, 4589 sizeof(stateid_opaque_t)); 4590 4591 *p++ = cpu_to_be32(1); /* we always return a single layout */ 4592 p = xdr_encode_hyper(p, lgp->lg_seg.offset); 4593 p = xdr_encode_hyper(p, lgp->lg_seg.length); 4594 *p++ = cpu_to_be32(lgp->lg_seg.iomode); 4595 *p++ = cpu_to_be32(lgp->lg_layout_type); 4596 4597 ops = nfsd4_layout_ops[lgp->lg_layout_type]; 4598 return ops->encode_layoutget(xdr, lgp); 4599 } 4600 4601 static __be32 4602 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, 4603 struct nfsd4_layoutcommit *lcp) 4604 { 4605 struct xdr_stream *xdr = resp->xdr; 4606 __be32 *p; 4607 4608 p = xdr_reserve_space(xdr, 4); 4609 if (!p) 4610 return nfserr_resource; 4611 *p++ = cpu_to_be32(lcp->lc_size_chg); 4612 if (lcp->lc_size_chg) { 4613 p = xdr_reserve_space(xdr, 8); 4614 if (!p) 4615 return nfserr_resource; 4616 p = xdr_encode_hyper(p, lcp->lc_newsize); 4617 } 4618 4619 return 0; 4620 } 4621 4622 static __be32 4623 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr, 4624 struct nfsd4_layoutreturn *lrp) 4625 { 4626 struct xdr_stream *xdr = resp->xdr; 4627 __be32 *p; 4628 4629 p = xdr_reserve_space(xdr, 4); 4630 if (!p) 4631 return nfserr_resource; 4632 *p++ = cpu_to_be32(lrp->lrs_present); 4633 if (lrp->lrs_present) 4634 return nfsd4_encode_stateid(xdr, &lrp->lr_sid); 4635 return 0; 4636 } 4637 #endif /* CONFIG_NFSD_PNFS */ 4638 4639 static __be32 4640 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, 4641 struct nfsd42_write_res *write, bool sync) 4642 { 4643 __be32 *p; 4644 p = xdr_reserve_space(resp->xdr, 4); 4645 if (!p) 4646 return nfserr_resource; 4647 4648 if (sync) 4649 *p++ = cpu_to_be32(0); 4650 else { 4651 __be32 nfserr; 4652 *p++ = cpu_to_be32(1); 4653 nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid); 4654 if (nfserr) 4655 return nfserr; 4656 } 4657 p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE); 4658 if (!p) 4659 return nfserr_resource; 4660 4661 p = xdr_encode_hyper(p, write->wr_bytes_written); 4662 *p++ = cpu_to_be32(write->wr_stable_how); 4663 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4664 NFS4_VERIFIER_SIZE); 4665 return nfs_ok; 4666 } 4667 4668 static __be32 4669 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns) 4670 { 4671 struct xdr_stream *xdr = resp->xdr; 4672 struct nfs42_netaddr *addr; 4673 __be32 *p; 4674 4675 p = xdr_reserve_space(xdr, 4); 4676 *p++ = cpu_to_be32(ns->nl4_type); 4677 4678 switch (ns->nl4_type) { 4679 case NL4_NETADDR: 4680 addr = &ns->u.nl4_addr; 4681 4682 /* netid_len, netid, uaddr_len, uaddr (port included 4683 * in RPCBIND_MAXUADDRLEN) 4684 */ 4685 p = xdr_reserve_space(xdr, 4686 4 /* netid len */ + 4687 (XDR_QUADLEN(addr->netid_len) * 4) + 4688 4 /* uaddr len */ + 4689 (XDR_QUADLEN(addr->addr_len) * 4)); 4690 if (!p) 4691 return nfserr_resource; 4692 4693 *p++ = cpu_to_be32(addr->netid_len); 4694 p = xdr_encode_opaque_fixed(p, addr->netid, 4695 addr->netid_len); 4696 *p++ = cpu_to_be32(addr->addr_len); 4697 p = xdr_encode_opaque_fixed(p, addr->addr, 4698 addr->addr_len); 4699 break; 4700 default: 4701 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR); 4702 return nfserr_inval; 4703 } 4704 4705 return 0; 4706 } 4707 4708 static __be32 4709 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr, 4710 struct nfsd4_copy *copy) 4711 { 4712 __be32 *p; 4713 4714 nfserr = nfsd42_encode_write_res(resp, ©->cp_res, 4715 !!copy->cp_synchronous); 4716 if (nfserr) 4717 return nfserr; 4718 4719 p = xdr_reserve_space(resp->xdr, 4 + 4); 4720 *p++ = xdr_one; /* cr_consecutive */ 4721 *p++ = cpu_to_be32(copy->cp_synchronous); 4722 return 0; 4723 } 4724 4725 static __be32 4726 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr, 4727 struct nfsd4_offload_status *os) 4728 { 4729 struct xdr_stream *xdr = resp->xdr; 4730 __be32 *p; 4731 4732 p = xdr_reserve_space(xdr, 8 + 4); 4733 if (!p) 4734 return nfserr_resource; 4735 p = xdr_encode_hyper(p, os->count); 4736 *p++ = cpu_to_be32(0); 4737 return nfserr; 4738 } 4739 4740 static __be32 4741 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp, 4742 struct nfsd4_read *read, 4743 unsigned long *maxcount, u32 *eof, 4744 loff_t *pos) 4745 { 4746 struct xdr_stream *xdr = resp->xdr; 4747 struct file *file = read->rd_nf->nf_file; 4748 int starting_len = xdr->buf->len; 4749 loff_t hole_pos; 4750 __be32 nfserr; 4751 __be32 *p, tmp; 4752 __be64 tmp64; 4753 4754 hole_pos = pos ? *pos : vfs_llseek(file, read->rd_offset, SEEK_HOLE); 4755 if (hole_pos > read->rd_offset) 4756 *maxcount = min_t(unsigned long, *maxcount, hole_pos - read->rd_offset); 4757 *maxcount = min_t(unsigned long, *maxcount, (xdr->buf->buflen - xdr->buf->len)); 4758 4759 /* Content type, offset, byte count */ 4760 p = xdr_reserve_space(xdr, 4 + 8 + 4); 4761 if (!p) 4762 return nfserr_resource; 4763 4764 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, *maxcount); 4765 if (read->rd_vlen < 0) 4766 return nfserr_resource; 4767 4768 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset, 4769 resp->rqstp->rq_vec, read->rd_vlen, maxcount, eof); 4770 if (nfserr) 4771 return nfserr; 4772 xdr_truncate_encode(xdr, starting_len + 16 + xdr_align_size(*maxcount)); 4773 4774 tmp = htonl(NFS4_CONTENT_DATA); 4775 write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4); 4776 tmp64 = cpu_to_be64(read->rd_offset); 4777 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp64, 8); 4778 tmp = htonl(*maxcount); 4779 write_bytes_to_xdr_buf(xdr->buf, starting_len + 12, &tmp, 4); 4780 4781 tmp = xdr_zero; 4782 write_bytes_to_xdr_buf(xdr->buf, starting_len + 16 + *maxcount, &tmp, 4783 xdr_pad_size(*maxcount)); 4784 return nfs_ok; 4785 } 4786 4787 static __be32 4788 nfsd4_encode_read_plus_hole(struct nfsd4_compoundres *resp, 4789 struct nfsd4_read *read, 4790 unsigned long *maxcount, u32 *eof) 4791 { 4792 struct file *file = read->rd_nf->nf_file; 4793 loff_t data_pos = vfs_llseek(file, read->rd_offset, SEEK_DATA); 4794 loff_t f_size = i_size_read(file_inode(file)); 4795 unsigned long count; 4796 __be32 *p; 4797 4798 if (data_pos == -ENXIO) 4799 data_pos = f_size; 4800 else if (data_pos <= read->rd_offset || (data_pos < f_size && data_pos % PAGE_SIZE)) 4801 return nfsd4_encode_read_plus_data(resp, read, maxcount, eof, &f_size); 4802 count = data_pos - read->rd_offset; 4803 4804 /* Content type, offset, byte count */ 4805 p = xdr_reserve_space(resp->xdr, 4 + 8 + 8); 4806 if (!p) 4807 return nfserr_resource; 4808 4809 *p++ = htonl(NFS4_CONTENT_HOLE); 4810 p = xdr_encode_hyper(p, read->rd_offset); 4811 p = xdr_encode_hyper(p, count); 4812 4813 *eof = (read->rd_offset + count) >= f_size; 4814 *maxcount = min_t(unsigned long, count, *maxcount); 4815 return nfs_ok; 4816 } 4817 4818 static __be32 4819 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr, 4820 struct nfsd4_read *read) 4821 { 4822 unsigned long maxcount, count; 4823 struct xdr_stream *xdr = resp->xdr; 4824 struct file *file; 4825 int starting_len = xdr->buf->len; 4826 int last_segment = xdr->buf->len; 4827 int segments = 0; 4828 __be32 *p, tmp; 4829 bool is_data; 4830 loff_t pos; 4831 u32 eof; 4832 4833 if (nfserr) 4834 return nfserr; 4835 file = read->rd_nf->nf_file; 4836 4837 /* eof flag, segment count */ 4838 p = xdr_reserve_space(xdr, 4 + 4); 4839 if (!p) 4840 return nfserr_resource; 4841 xdr_commit_encode(xdr); 4842 4843 maxcount = svc_max_payload(resp->rqstp); 4844 maxcount = min_t(unsigned long, maxcount, 4845 (xdr->buf->buflen - xdr->buf->len)); 4846 maxcount = min_t(unsigned long, maxcount, read->rd_length); 4847 count = maxcount; 4848 4849 eof = read->rd_offset >= i_size_read(file_inode(file)); 4850 if (eof) 4851 goto out; 4852 4853 pos = vfs_llseek(file, read->rd_offset, SEEK_HOLE); 4854 is_data = pos > read->rd_offset; 4855 4856 while (count > 0 && !eof) { 4857 maxcount = count; 4858 if (is_data) 4859 nfserr = nfsd4_encode_read_plus_data(resp, read, &maxcount, &eof, 4860 segments == 0 ? &pos : NULL); 4861 else 4862 nfserr = nfsd4_encode_read_plus_hole(resp, read, &maxcount, &eof); 4863 if (nfserr) 4864 goto out; 4865 count -= maxcount; 4866 read->rd_offset += maxcount; 4867 is_data = !is_data; 4868 last_segment = xdr->buf->len; 4869 segments++; 4870 } 4871 4872 out: 4873 if (nfserr && segments == 0) 4874 xdr_truncate_encode(xdr, starting_len); 4875 else { 4876 if (nfserr) { 4877 xdr_truncate_encode(xdr, last_segment); 4878 nfserr = nfs_ok; 4879 eof = 0; 4880 } 4881 tmp = htonl(eof); 4882 write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4); 4883 tmp = htonl(segments); 4884 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4); 4885 } 4886 4887 return nfserr; 4888 } 4889 4890 static __be32 4891 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr, 4892 struct nfsd4_copy_notify *cn) 4893 { 4894 struct xdr_stream *xdr = resp->xdr; 4895 __be32 *p; 4896 4897 if (nfserr) 4898 return nfserr; 4899 4900 /* 8 sec, 4 nsec */ 4901 p = xdr_reserve_space(xdr, 12); 4902 if (!p) 4903 return nfserr_resource; 4904 4905 /* cnr_lease_time */ 4906 p = xdr_encode_hyper(p, cn->cpn_sec); 4907 *p++ = cpu_to_be32(cn->cpn_nsec); 4908 4909 /* cnr_stateid */ 4910 nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid); 4911 if (nfserr) 4912 return nfserr; 4913 4914 /* cnr_src.nl_nsvr */ 4915 p = xdr_reserve_space(xdr, 4); 4916 if (!p) 4917 return nfserr_resource; 4918 4919 *p++ = cpu_to_be32(1); 4920 4921 return nfsd42_encode_nl4_server(resp, &cn->cpn_src); 4922 } 4923 4924 static __be32 4925 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, 4926 struct nfsd4_seek *seek) 4927 { 4928 __be32 *p; 4929 4930 p = xdr_reserve_space(resp->xdr, 4 + 8); 4931 *p++ = cpu_to_be32(seek->seek_eof); 4932 p = xdr_encode_hyper(p, seek->seek_pos); 4933 4934 return 0; 4935 } 4936 4937 static __be32 4938 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p) 4939 { 4940 return nfserr; 4941 } 4942 4943 /* 4944 * Encode kmalloc-ed buffer in to XDR stream. 4945 */ 4946 static __be32 4947 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen) 4948 { 4949 u32 cplen; 4950 __be32 *p; 4951 4952 cplen = min_t(unsigned long, buflen, 4953 ((void *)xdr->end - (void *)xdr->p)); 4954 p = xdr_reserve_space(xdr, cplen); 4955 if (!p) 4956 return nfserr_resource; 4957 4958 memcpy(p, buf, cplen); 4959 buf += cplen; 4960 buflen -= cplen; 4961 4962 while (buflen) { 4963 cplen = min_t(u32, buflen, PAGE_SIZE); 4964 p = xdr_reserve_space(xdr, cplen); 4965 if (!p) 4966 return nfserr_resource; 4967 4968 memcpy(p, buf, cplen); 4969 4970 if (cplen < PAGE_SIZE) { 4971 /* 4972 * We're done, with a length that wasn't page 4973 * aligned, so possibly not word aligned. Pad 4974 * any trailing bytes with 0. 4975 */ 4976 xdr_encode_opaque_fixed(p, NULL, cplen); 4977 break; 4978 } 4979 4980 buflen -= PAGE_SIZE; 4981 buf += PAGE_SIZE; 4982 } 4983 4984 return 0; 4985 } 4986 4987 static __be32 4988 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 4989 struct nfsd4_getxattr *getxattr) 4990 { 4991 struct xdr_stream *xdr = resp->xdr; 4992 __be32 *p, err; 4993 4994 p = xdr_reserve_space(xdr, 4); 4995 if (!p) 4996 return nfserr_resource; 4997 4998 *p = cpu_to_be32(getxattr->getxa_len); 4999 5000 if (getxattr->getxa_len == 0) 5001 return 0; 5002 5003 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf, 5004 getxattr->getxa_len); 5005 5006 kvfree(getxattr->getxa_buf); 5007 5008 return err; 5009 } 5010 5011 static __be32 5012 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5013 struct nfsd4_setxattr *setxattr) 5014 { 5015 struct xdr_stream *xdr = resp->xdr; 5016 __be32 *p; 5017 5018 p = xdr_reserve_space(xdr, 20); 5019 if (!p) 5020 return nfserr_resource; 5021 5022 encode_cinfo(p, &setxattr->setxa_cinfo); 5023 5024 return 0; 5025 } 5026 5027 /* 5028 * See if there are cookie values that can be rejected outright. 5029 */ 5030 static __be32 5031 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs, 5032 u32 *offsetp) 5033 { 5034 u64 cookie = listxattrs->lsxa_cookie; 5035 5036 /* 5037 * If the cookie is larger than the maximum number we can fit 5038 * in either the buffer we just got back from vfs_listxattr, or, 5039 * XDR-encoded, in the return buffer, it's invalid. 5040 */ 5041 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2)) 5042 return nfserr_badcookie; 5043 5044 if (cookie > (listxattrs->lsxa_maxcount / 5045 (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4))) 5046 return nfserr_badcookie; 5047 5048 *offsetp = (u32)cookie; 5049 return 0; 5050 } 5051 5052 static __be32 5053 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr, 5054 struct nfsd4_listxattrs *listxattrs) 5055 { 5056 struct xdr_stream *xdr = resp->xdr; 5057 u32 cookie_offset, count_offset, eof; 5058 u32 left, xdrleft, slen, count; 5059 u32 xdrlen, offset; 5060 u64 cookie; 5061 char *sp; 5062 __be32 status, tmp; 5063 __be32 *p; 5064 u32 nuser; 5065 5066 eof = 1; 5067 5068 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset); 5069 if (status) 5070 goto out; 5071 5072 /* 5073 * Reserve space for the cookie and the name array count. Record 5074 * the offsets to save them later. 5075 */ 5076 cookie_offset = xdr->buf->len; 5077 count_offset = cookie_offset + 8; 5078 p = xdr_reserve_space(xdr, 12); 5079 if (!p) { 5080 status = nfserr_resource; 5081 goto out; 5082 } 5083 5084 count = 0; 5085 left = listxattrs->lsxa_len; 5086 sp = listxattrs->lsxa_buf; 5087 nuser = 0; 5088 5089 xdrleft = listxattrs->lsxa_maxcount; 5090 5091 while (left > 0 && xdrleft > 0) { 5092 slen = strlen(sp); 5093 5094 /* 5095 * Check if this is a "user." attribute, skip it if not. 5096 */ 5097 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) 5098 goto contloop; 5099 5100 slen -= XATTR_USER_PREFIX_LEN; 5101 xdrlen = 4 + ((slen + 3) & ~3); 5102 if (xdrlen > xdrleft) { 5103 if (count == 0) { 5104 /* 5105 * Can't even fit the first attribute name. 5106 */ 5107 status = nfserr_toosmall; 5108 goto out; 5109 } 5110 eof = 0; 5111 goto wreof; 5112 } 5113 5114 left -= XATTR_USER_PREFIX_LEN; 5115 sp += XATTR_USER_PREFIX_LEN; 5116 if (nuser++ < offset) 5117 goto contloop; 5118 5119 5120 p = xdr_reserve_space(xdr, xdrlen); 5121 if (!p) { 5122 status = nfserr_resource; 5123 goto out; 5124 } 5125 5126 xdr_encode_opaque(p, sp, slen); 5127 5128 xdrleft -= xdrlen; 5129 count++; 5130 contloop: 5131 sp += slen + 1; 5132 left -= slen + 1; 5133 } 5134 5135 /* 5136 * If there were user attributes to copy, but we didn't copy 5137 * any, the offset was too large (e.g. the cookie was invalid). 5138 */ 5139 if (nuser > 0 && count == 0) { 5140 status = nfserr_badcookie; 5141 goto out; 5142 } 5143 5144 wreof: 5145 p = xdr_reserve_space(xdr, 4); 5146 if (!p) { 5147 status = nfserr_resource; 5148 goto out; 5149 } 5150 *p = cpu_to_be32(eof); 5151 5152 cookie = offset + count; 5153 5154 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8); 5155 tmp = cpu_to_be32(count); 5156 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4); 5157 out: 5158 if (listxattrs->lsxa_len) 5159 kvfree(listxattrs->lsxa_buf); 5160 return status; 5161 } 5162 5163 static __be32 5164 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5165 struct nfsd4_removexattr *removexattr) 5166 { 5167 struct xdr_stream *xdr = resp->xdr; 5168 __be32 *p; 5169 5170 p = xdr_reserve_space(xdr, 20); 5171 if (!p) 5172 return nfserr_resource; 5173 5174 p = encode_cinfo(p, &removexattr->rmxa_cinfo); 5175 return 0; 5176 } 5177 5178 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *); 5179 5180 /* 5181 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1 5182 * since we don't need to filter out obsolete ops as this is 5183 * done in the decoding phase. 5184 */ 5185 static const nfsd4_enc nfsd4_enc_ops[] = { 5186 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access, 5187 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close, 5188 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit, 5189 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create, 5190 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop, 5191 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop, 5192 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr, 5193 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh, 5194 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link, 5195 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock, 5196 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt, 5197 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku, 5198 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop, 5199 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop, 5200 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop, 5201 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open, 5202 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop, 5203 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm, 5204 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade, 5205 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop, 5206 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop, 5207 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop, 5208 [OP_READ] = (nfsd4_enc)nfsd4_encode_read, 5209 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir, 5210 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink, 5211 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove, 5212 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename, 5213 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop, 5214 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop, 5215 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop, 5216 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo, 5217 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr, 5218 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid, 5219 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop, 5220 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop, 5221 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write, 5222 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop, 5223 5224 /* NFSv4.1 operations */ 5225 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop, 5226 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session, 5227 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id, 5228 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session, 5229 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop, 5230 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop, 5231 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 5232 #ifdef CONFIG_NFSD_PNFS 5233 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo, 5234 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 5235 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit, 5236 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget, 5237 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn, 5238 #else 5239 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop, 5240 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 5241 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop, 5242 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop, 5243 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop, 5244 #endif 5245 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name, 5246 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence, 5247 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop, 5248 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid, 5249 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 5250 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop, 5251 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop, 5252 5253 /* NFSv4.2 operations */ 5254 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 5255 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy, 5256 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_copy_notify, 5257 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 5258 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop, 5259 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop, 5260 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop, 5261 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop, 5262 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_offload_status, 5263 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_read_plus, 5264 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek, 5265 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop, 5266 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop, 5267 5268 /* RFC 8276 extended atributes operations */ 5269 [OP_GETXATTR] = (nfsd4_enc)nfsd4_encode_getxattr, 5270 [OP_SETXATTR] = (nfsd4_enc)nfsd4_encode_setxattr, 5271 [OP_LISTXATTRS] = (nfsd4_enc)nfsd4_encode_listxattrs, 5272 [OP_REMOVEXATTR] = (nfsd4_enc)nfsd4_encode_removexattr, 5273 }; 5274 5275 /* 5276 * Calculate whether we still have space to encode repsize bytes. 5277 * There are two considerations: 5278 * - For NFS versions >=4.1, the size of the reply must stay within 5279 * session limits 5280 * - For all NFS versions, we must stay within limited preallocated 5281 * buffer space. 5282 * 5283 * This is called before the operation is processed, so can only provide 5284 * an upper estimate. For some nonidempotent operations (such as 5285 * getattr), it's not necessarily a problem if that estimate is wrong, 5286 * as we can fail it after processing without significant side effects. 5287 */ 5288 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize) 5289 { 5290 struct xdr_buf *buf = &resp->rqstp->rq_res; 5291 struct nfsd4_slot *slot = resp->cstate.slot; 5292 5293 if (buf->len + respsize <= buf->buflen) 5294 return nfs_ok; 5295 if (!nfsd4_has_session(&resp->cstate)) 5296 return nfserr_resource; 5297 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) { 5298 WARN_ON_ONCE(1); 5299 return nfserr_rep_too_big_to_cache; 5300 } 5301 return nfserr_rep_too_big; 5302 } 5303 5304 void 5305 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 5306 { 5307 struct xdr_stream *xdr = resp->xdr; 5308 struct nfs4_stateowner *so = resp->cstate.replay_owner; 5309 struct svc_rqst *rqstp = resp->rqstp; 5310 const struct nfsd4_operation *opdesc = op->opdesc; 5311 int post_err_offset; 5312 nfsd4_enc encoder; 5313 __be32 *p; 5314 5315 p = xdr_reserve_space(xdr, 8); 5316 if (!p) { 5317 WARN_ON_ONCE(1); 5318 return; 5319 } 5320 *p++ = cpu_to_be32(op->opnum); 5321 post_err_offset = xdr->buf->len; 5322 5323 if (op->opnum == OP_ILLEGAL) 5324 goto status; 5325 if (op->status && opdesc && 5326 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE)) 5327 goto status; 5328 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || 5329 !nfsd4_enc_ops[op->opnum]); 5330 encoder = nfsd4_enc_ops[op->opnum]; 5331 op->status = encoder(resp, op->status, &op->u); 5332 if (op->status) 5333 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status); 5334 if (opdesc && opdesc->op_release) 5335 opdesc->op_release(&op->u); 5336 xdr_commit_encode(xdr); 5337 5338 /* nfsd4_check_resp_size guarantees enough room for error status */ 5339 if (!op->status) { 5340 int space_needed = 0; 5341 if (!nfsd4_last_compound_op(rqstp)) 5342 space_needed = COMPOUND_ERR_SLACK_SPACE; 5343 op->status = nfsd4_check_resp_size(resp, space_needed); 5344 } 5345 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) { 5346 struct nfsd4_slot *slot = resp->cstate.slot; 5347 5348 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) 5349 op->status = nfserr_rep_too_big_to_cache; 5350 else 5351 op->status = nfserr_rep_too_big; 5352 } 5353 if (op->status == nfserr_resource || 5354 op->status == nfserr_rep_too_big || 5355 op->status == nfserr_rep_too_big_to_cache) { 5356 /* 5357 * The operation may have already been encoded or 5358 * partially encoded. No op returns anything additional 5359 * in the case of one of these three errors, so we can 5360 * just truncate back to after the status. But it's a 5361 * bug if we had to do this on a non-idempotent op: 5362 */ 5363 warn_on_nonidempotent_op(op); 5364 xdr_truncate_encode(xdr, post_err_offset); 5365 } 5366 if (so) { 5367 int len = xdr->buf->len - post_err_offset; 5368 5369 so->so_replay.rp_status = op->status; 5370 so->so_replay.rp_buflen = len; 5371 read_bytes_from_xdr_buf(xdr->buf, post_err_offset, 5372 so->so_replay.rp_buf, len); 5373 } 5374 status: 5375 /* Note that op->status is already in network byte order: */ 5376 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4); 5377 } 5378 5379 /* 5380 * Encode the reply stored in the stateowner reply cache 5381 * 5382 * XDR note: do not encode rp->rp_buflen: the buffer contains the 5383 * previously sent already encoded operation. 5384 */ 5385 void 5386 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op) 5387 { 5388 __be32 *p; 5389 struct nfs4_replay *rp = op->replay; 5390 5391 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen); 5392 if (!p) { 5393 WARN_ON_ONCE(1); 5394 return; 5395 } 5396 *p++ = cpu_to_be32(op->opnum); 5397 *p++ = rp->rp_status; /* already xdr'ed */ 5398 5399 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen); 5400 } 5401 5402 void nfsd4_release_compoundargs(struct svc_rqst *rqstp) 5403 { 5404 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5405 5406 if (args->ops != args->iops) { 5407 kfree(args->ops); 5408 args->ops = args->iops; 5409 } 5410 while (args->to_free) { 5411 struct svcxdr_tmpbuf *tb = args->to_free; 5412 args->to_free = tb->next; 5413 kfree(tb); 5414 } 5415 } 5416 5417 bool 5418 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5419 { 5420 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5421 5422 /* svcxdr_tmp_alloc */ 5423 args->to_free = NULL; 5424 5425 args->xdr = xdr; 5426 args->ops = args->iops; 5427 args->rqstp = rqstp; 5428 5429 return nfsd4_decode_compound(args); 5430 } 5431 5432 bool 5433 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5434 { 5435 struct nfsd4_compoundres *resp = rqstp->rq_resp; 5436 struct xdr_buf *buf = xdr->buf; 5437 __be32 *p; 5438 5439 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len + 5440 buf->tail[0].iov_len); 5441 5442 /* 5443 * Send buffer space for the following items is reserved 5444 * at the top of nfsd4_proc_compound(). 5445 */ 5446 p = resp->statusp; 5447 5448 *p++ = resp->cstate.status; 5449 5450 rqstp->rq_next_page = xdr->page_ptr + 1; 5451 5452 *p++ = htonl(resp->taglen); 5453 memcpy(p, resp->tag, resp->taglen); 5454 p += XDR_QUADLEN(resp->taglen); 5455 *p++ = htonl(resp->opcnt); 5456 5457 nfsd4_sequence_done(resp); 5458 return true; 5459 } 5460