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 for (i = 0; i < bmlen; i++) 292 bmval[i] = (i < count) ? be32_to_cpup(p++) : 0; 293 294 return nfs_ok; 295 } 296 297 static __be32 298 nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace) 299 { 300 __be32 *p, status; 301 u32 length; 302 303 if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0) 304 return nfserr_bad_xdr; 305 if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0) 306 return nfserr_bad_xdr; 307 if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0) 308 return nfserr_bad_xdr; 309 310 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 311 return nfserr_bad_xdr; 312 p = xdr_inline_decode(argp->xdr, length); 313 if (!p) 314 return nfserr_bad_xdr; 315 ace->whotype = nfs4_acl_get_whotype((char *)p, length); 316 if (ace->whotype != NFS4_ACL_WHO_NAMED) 317 status = nfs_ok; 318 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 319 status = nfsd_map_name_to_gid(argp->rqstp, 320 (char *)p, length, &ace->who_gid); 321 else 322 status = nfsd_map_name_to_uid(argp->rqstp, 323 (char *)p, length, &ace->who_uid); 324 325 return status; 326 } 327 328 /* A counted array of nfsace4's */ 329 static noinline __be32 330 nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl) 331 { 332 struct nfs4_ace *ace; 333 __be32 status; 334 u32 count; 335 336 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 337 return nfserr_bad_xdr; 338 339 if (count > xdr_stream_remaining(argp->xdr) / 20) 340 /* 341 * Even with 4-byte names there wouldn't be 342 * space for that many aces; something fishy is 343 * going on: 344 */ 345 return nfserr_fbig; 346 347 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count)); 348 if (*acl == NULL) 349 return nfserr_jukebox; 350 351 (*acl)->naces = count; 352 for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) { 353 status = nfsd4_decode_nfsace4(argp, ace); 354 if (status) 355 return status; 356 } 357 358 return nfs_ok; 359 } 360 361 static noinline __be32 362 nfsd4_decode_security_label(struct nfsd4_compoundargs *argp, 363 struct xdr_netobj *label) 364 { 365 u32 lfs, pi, length; 366 __be32 *p; 367 368 if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0) 369 return nfserr_bad_xdr; 370 if (xdr_stream_decode_u32(argp->xdr, &pi) < 0) 371 return nfserr_bad_xdr; 372 373 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 374 return nfserr_bad_xdr; 375 if (length > NFS4_MAXLABELLEN) 376 return nfserr_badlabel; 377 p = xdr_inline_decode(argp->xdr, length); 378 if (!p) 379 return nfserr_bad_xdr; 380 label->len = length; 381 label->data = svcxdr_dupstr(argp, p, length); 382 if (!label->data) 383 return nfserr_jukebox; 384 385 return nfs_ok; 386 } 387 388 static __be32 389 nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen, 390 struct iattr *iattr, struct nfs4_acl **acl, 391 struct xdr_netobj *label, int *umask) 392 { 393 unsigned int starting_pos; 394 u32 attrlist4_count; 395 __be32 *p, status; 396 397 iattr->ia_valid = 0; 398 status = nfsd4_decode_bitmap4(argp, bmval, bmlen); 399 if (status) 400 return nfserr_bad_xdr; 401 402 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0 403 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1 404 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) { 405 if (nfsd_attrs_supported(argp->minorversion, bmval)) 406 return nfserr_inval; 407 return nfserr_attrnotsupp; 408 } 409 410 if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0) 411 return nfserr_bad_xdr; 412 starting_pos = xdr_stream_pos(argp->xdr); 413 414 if (bmval[0] & FATTR4_WORD0_SIZE) { 415 u64 size; 416 417 if (xdr_stream_decode_u64(argp->xdr, &size) < 0) 418 return nfserr_bad_xdr; 419 iattr->ia_size = size; 420 iattr->ia_valid |= ATTR_SIZE; 421 } 422 if (bmval[0] & FATTR4_WORD0_ACL) { 423 status = nfsd4_decode_acl(argp, acl); 424 if (status) 425 return status; 426 } else 427 *acl = NULL; 428 if (bmval[1] & FATTR4_WORD1_MODE) { 429 u32 mode; 430 431 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0) 432 return nfserr_bad_xdr; 433 iattr->ia_mode = mode; 434 iattr->ia_mode &= (S_IFMT | S_IALLUGO); 435 iattr->ia_valid |= ATTR_MODE; 436 } 437 if (bmval[1] & FATTR4_WORD1_OWNER) { 438 u32 length; 439 440 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 441 return nfserr_bad_xdr; 442 p = xdr_inline_decode(argp->xdr, length); 443 if (!p) 444 return nfserr_bad_xdr; 445 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length, 446 &iattr->ia_uid); 447 if (status) 448 return status; 449 iattr->ia_valid |= ATTR_UID; 450 } 451 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { 452 u32 length; 453 454 if (xdr_stream_decode_u32(argp->xdr, &length) < 0) 455 return nfserr_bad_xdr; 456 p = xdr_inline_decode(argp->xdr, length); 457 if (!p) 458 return nfserr_bad_xdr; 459 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length, 460 &iattr->ia_gid); 461 if (status) 462 return status; 463 iattr->ia_valid |= ATTR_GID; 464 } 465 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { 466 u32 set_it; 467 468 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0) 469 return nfserr_bad_xdr; 470 switch (set_it) { 471 case NFS4_SET_TO_CLIENT_TIME: 472 status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime); 473 if (status) 474 return status; 475 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 476 break; 477 case NFS4_SET_TO_SERVER_TIME: 478 iattr->ia_valid |= ATTR_ATIME; 479 break; 480 default: 481 return nfserr_bad_xdr; 482 } 483 } 484 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 485 u32 set_it; 486 487 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0) 488 return nfserr_bad_xdr; 489 switch (set_it) { 490 case NFS4_SET_TO_CLIENT_TIME: 491 status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime); 492 if (status) 493 return status; 494 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 495 break; 496 case NFS4_SET_TO_SERVER_TIME: 497 iattr->ia_valid |= ATTR_MTIME; 498 break; 499 default: 500 return nfserr_bad_xdr; 501 } 502 } 503 label->len = 0; 504 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) && 505 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) { 506 status = nfsd4_decode_security_label(argp, label); 507 if (status) 508 return status; 509 } 510 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) { 511 u32 mode, mask; 512 513 if (!umask) 514 return nfserr_bad_xdr; 515 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0) 516 return nfserr_bad_xdr; 517 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO); 518 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0) 519 return nfserr_bad_xdr; 520 *umask = mask & S_IRWXUGO; 521 iattr->ia_valid |= ATTR_MODE; 522 } 523 524 /* request sanity: did attrlist4 contain the expected number of words? */ 525 if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos) 526 return nfserr_bad_xdr; 527 528 return nfs_ok; 529 } 530 531 static __be32 532 nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid) 533 { 534 __be32 *p; 535 536 p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE); 537 if (!p) 538 return nfserr_bad_xdr; 539 sid->si_generation = be32_to_cpup(p++); 540 memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque)); 541 return nfs_ok; 542 } 543 544 static __be32 545 nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid) 546 { 547 __be32 *p; 548 549 p = xdr_inline_decode(argp->xdr, sizeof(__be64)); 550 if (!p) 551 return nfserr_bad_xdr; 552 memcpy(clientid, p, sizeof(*clientid)); 553 return nfs_ok; 554 } 555 556 static __be32 557 nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp, 558 clientid_t *clientid, struct xdr_netobj *owner) 559 { 560 __be32 status; 561 562 status = nfsd4_decode_clientid4(argp, clientid); 563 if (status) 564 return status; 565 return nfsd4_decode_opaque(argp, owner); 566 } 567 568 #ifdef CONFIG_NFSD_PNFS 569 static __be32 570 nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp, 571 struct nfsd4_deviceid *devid) 572 { 573 __be32 *p; 574 575 p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE); 576 if (!p) 577 return nfserr_bad_xdr; 578 memcpy(devid, p, sizeof(*devid)); 579 return nfs_ok; 580 } 581 582 static __be32 583 nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp, 584 struct nfsd4_layoutcommit *lcp) 585 { 586 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0) 587 return nfserr_bad_xdr; 588 if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES) 589 return nfserr_bad_xdr; 590 if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX) 591 return nfserr_bad_xdr; 592 593 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0) 594 return nfserr_bad_xdr; 595 if (lcp->lc_up_len > 0) { 596 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len); 597 if (!lcp->lc_up_layout) 598 return nfserr_bad_xdr; 599 } 600 601 return nfs_ok; 602 } 603 604 static __be32 605 nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp, 606 struct nfsd4_layoutreturn *lrp) 607 { 608 __be32 status; 609 610 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0) 611 return nfserr_bad_xdr; 612 switch (lrp->lr_return_type) { 613 case RETURN_FILE: 614 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0) 615 return nfserr_bad_xdr; 616 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0) 617 return nfserr_bad_xdr; 618 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid); 619 if (status) 620 return status; 621 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0) 622 return nfserr_bad_xdr; 623 if (lrp->lrf_body_len > 0) { 624 lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len); 625 if (!lrp->lrf_body) 626 return nfserr_bad_xdr; 627 } 628 break; 629 case RETURN_FSID: 630 case RETURN_ALL: 631 lrp->lr_seg.offset = 0; 632 lrp->lr_seg.length = NFS4_MAX_UINT64; 633 break; 634 default: 635 return nfserr_bad_xdr; 636 } 637 638 return nfs_ok; 639 } 640 641 #endif /* CONFIG_NFSD_PNFS */ 642 643 static __be32 644 nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp, 645 struct nfs4_sessionid *sessionid) 646 { 647 __be32 *p; 648 649 p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN); 650 if (!p) 651 return nfserr_bad_xdr; 652 memcpy(sessionid->data, p, sizeof(sessionid->data)); 653 return nfs_ok; 654 } 655 656 /* Defined in Appendix A of RFC 5531 */ 657 static __be32 658 nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp, 659 struct nfsd4_cb_sec *cbs) 660 { 661 u32 stamp, gidcount, uid, gid; 662 __be32 *p, status; 663 664 if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0) 665 return nfserr_bad_xdr; 666 /* machine name */ 667 status = nfsd4_decode_ignored_string(argp, 255); 668 if (status) 669 return status; 670 if (xdr_stream_decode_u32(argp->xdr, &uid) < 0) 671 return nfserr_bad_xdr; 672 if (xdr_stream_decode_u32(argp->xdr, &gid) < 0) 673 return nfserr_bad_xdr; 674 if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0) 675 return nfserr_bad_xdr; 676 if (gidcount > 16) 677 return nfserr_bad_xdr; 678 p = xdr_inline_decode(argp->xdr, gidcount << 2); 679 if (!p) 680 return nfserr_bad_xdr; 681 if (cbs->flavor == (u32)(-1)) { 682 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp); 683 684 kuid_t kuid = make_kuid(userns, uid); 685 kgid_t kgid = make_kgid(userns, gid); 686 if (uid_valid(kuid) && gid_valid(kgid)) { 687 cbs->uid = kuid; 688 cbs->gid = kgid; 689 cbs->flavor = RPC_AUTH_UNIX; 690 } else { 691 dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n"); 692 } 693 } 694 695 return nfs_ok; 696 } 697 698 static __be32 699 nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp, 700 struct nfsd4_cb_sec *cbs) 701 { 702 __be32 status; 703 u32 service; 704 705 dprintk("RPC_AUTH_GSS callback secflavor not supported!\n"); 706 707 if (xdr_stream_decode_u32(argp->xdr, &service) < 0) 708 return nfserr_bad_xdr; 709 if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY) 710 return nfserr_bad_xdr; 711 /* gcbp_handle_from_server */ 712 status = nfsd4_decode_ignored_string(argp, 0); 713 if (status) 714 return status; 715 /* gcbp_handle_from_client */ 716 status = nfsd4_decode_ignored_string(argp, 0); 717 if (status) 718 return status; 719 720 return nfs_ok; 721 } 722 723 /* a counted array of callback_sec_parms4 items */ 724 static __be32 725 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs) 726 { 727 u32 i, secflavor, nr_secflavs; 728 __be32 status; 729 730 /* callback_sec_params4 */ 731 if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0) 732 return nfserr_bad_xdr; 733 if (nr_secflavs) 734 cbs->flavor = (u32)(-1); 735 else 736 /* Is this legal? Be generous, take it to mean AUTH_NONE: */ 737 cbs->flavor = 0; 738 739 for (i = 0; i < nr_secflavs; ++i) { 740 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0) 741 return nfserr_bad_xdr; 742 switch (secflavor) { 743 case RPC_AUTH_NULL: 744 /* void */ 745 if (cbs->flavor == (u32)(-1)) 746 cbs->flavor = RPC_AUTH_NULL; 747 break; 748 case RPC_AUTH_UNIX: 749 status = nfsd4_decode_authsys_parms(argp, cbs); 750 if (status) 751 return status; 752 break; 753 case RPC_AUTH_GSS: 754 status = nfsd4_decode_gss_cb_handles4(argp, cbs); 755 if (status) 756 return status; 757 break; 758 default: 759 return nfserr_inval; 760 } 761 } 762 763 return nfs_ok; 764 } 765 766 767 /* 768 * NFSv4 operation argument decoders 769 */ 770 771 static __be32 772 nfsd4_decode_access(struct nfsd4_compoundargs *argp, 773 struct nfsd4_access *access) 774 { 775 if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0) 776 return nfserr_bad_xdr; 777 return nfs_ok; 778 } 779 780 static __be32 781 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close) 782 { 783 if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0) 784 return nfserr_bad_xdr; 785 return nfsd4_decode_stateid4(argp, &close->cl_stateid); 786 } 787 788 789 static __be32 790 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit) 791 { 792 if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0) 793 return nfserr_bad_xdr; 794 if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0) 795 return nfserr_bad_xdr; 796 return nfs_ok; 797 } 798 799 static __be32 800 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) 801 { 802 __be32 *p, status; 803 804 if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0) 805 return nfserr_bad_xdr; 806 switch (create->cr_type) { 807 case NF4LNK: 808 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0) 809 return nfserr_bad_xdr; 810 p = xdr_inline_decode(argp->xdr, create->cr_datalen); 811 if (!p) 812 return nfserr_bad_xdr; 813 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen); 814 if (!create->cr_data) 815 return nfserr_jukebox; 816 break; 817 case NF4BLK: 818 case NF4CHR: 819 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0) 820 return nfserr_bad_xdr; 821 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0) 822 return nfserr_bad_xdr; 823 break; 824 case NF4SOCK: 825 case NF4FIFO: 826 case NF4DIR: 827 default: 828 break; 829 } 830 status = nfsd4_decode_component4(argp, &create->cr_name, 831 &create->cr_namelen); 832 if (status) 833 return status; 834 status = nfsd4_decode_fattr4(argp, create->cr_bmval, 835 ARRAY_SIZE(create->cr_bmval), 836 &create->cr_iattr, &create->cr_acl, 837 &create->cr_label, &create->cr_umask); 838 if (status) 839 return status; 840 841 return nfs_ok; 842 } 843 844 static inline __be32 845 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr) 846 { 847 return nfsd4_decode_stateid4(argp, &dr->dr_stateid); 848 } 849 850 static inline __be32 851 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr) 852 { 853 return nfsd4_decode_bitmap4(argp, getattr->ga_bmval, 854 ARRAY_SIZE(getattr->ga_bmval)); 855 } 856 857 static __be32 858 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link) 859 { 860 return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen); 861 } 862 863 static __be32 864 nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp, 865 struct nfsd4_lock *lock) 866 { 867 __be32 status; 868 869 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0) 870 return nfserr_bad_xdr; 871 status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid); 872 if (status) 873 return status; 874 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0) 875 return nfserr_bad_xdr; 876 return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid, 877 &lock->lk_new_owner); 878 } 879 880 static __be32 881 nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp, 882 struct nfsd4_lock *lock) 883 { 884 __be32 status; 885 886 status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid); 887 if (status) 888 return status; 889 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0) 890 return nfserr_bad_xdr; 891 892 return nfs_ok; 893 } 894 895 static __be32 896 nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 897 { 898 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0) 899 return nfserr_bad_xdr; 900 if (lock->lk_is_new) 901 return nfsd4_decode_open_to_lock_owner4(argp, lock); 902 return nfsd4_decode_exist_lock_owner4(argp, lock); 903 } 904 905 static __be32 906 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 907 { 908 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0) 909 return nfserr_bad_xdr; 910 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 911 return nfserr_bad_xdr; 912 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0) 913 return nfserr_bad_xdr; 914 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0) 915 return nfserr_bad_xdr; 916 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0) 917 return nfserr_bad_xdr; 918 return nfsd4_decode_locker4(argp, lock); 919 } 920 921 static __be32 922 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt) 923 { 924 if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0) 925 return nfserr_bad_xdr; 926 if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 927 return nfserr_bad_xdr; 928 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0) 929 return nfserr_bad_xdr; 930 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0) 931 return nfserr_bad_xdr; 932 return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid, 933 &lockt->lt_owner); 934 } 935 936 static __be32 937 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku) 938 { 939 __be32 status; 940 941 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0) 942 return nfserr_bad_xdr; 943 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 944 return nfserr_bad_xdr; 945 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0) 946 return nfserr_bad_xdr; 947 status = nfsd4_decode_stateid4(argp, &locku->lu_stateid); 948 if (status) 949 return status; 950 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0) 951 return nfserr_bad_xdr; 952 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0) 953 return nfserr_bad_xdr; 954 955 return nfs_ok; 956 } 957 958 static __be32 959 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup) 960 { 961 return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len); 962 } 963 964 static __be32 965 nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 966 { 967 __be32 status; 968 969 if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0) 970 return nfserr_bad_xdr; 971 switch (open->op_createmode) { 972 case NFS4_CREATE_UNCHECKED: 973 case NFS4_CREATE_GUARDED: 974 status = nfsd4_decode_fattr4(argp, open->op_bmval, 975 ARRAY_SIZE(open->op_bmval), 976 &open->op_iattr, &open->op_acl, 977 &open->op_label, &open->op_umask); 978 if (status) 979 return status; 980 break; 981 case NFS4_CREATE_EXCLUSIVE: 982 status = nfsd4_decode_verifier4(argp, &open->op_verf); 983 if (status) 984 return status; 985 break; 986 case NFS4_CREATE_EXCLUSIVE4_1: 987 if (argp->minorversion < 1) 988 return nfserr_bad_xdr; 989 status = nfsd4_decode_verifier4(argp, &open->op_verf); 990 if (status) 991 return status; 992 status = nfsd4_decode_fattr4(argp, open->op_bmval, 993 ARRAY_SIZE(open->op_bmval), 994 &open->op_iattr, &open->op_acl, 995 &open->op_label, &open->op_umask); 996 if (status) 997 return status; 998 break; 999 default: 1000 return nfserr_bad_xdr; 1001 } 1002 1003 return nfs_ok; 1004 } 1005 1006 static __be32 1007 nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 1008 { 1009 __be32 status; 1010 1011 if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0) 1012 return nfserr_bad_xdr; 1013 switch (open->op_create) { 1014 case NFS4_OPEN_NOCREATE: 1015 break; 1016 case NFS4_OPEN_CREATE: 1017 status = nfsd4_decode_createhow4(argp, open); 1018 if (status) 1019 return status; 1020 break; 1021 default: 1022 return nfserr_bad_xdr; 1023 } 1024 1025 return nfs_ok; 1026 } 1027 1028 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when) 1029 { 1030 u32 w; 1031 1032 if (xdr_stream_decode_u32(argp->xdr, &w) < 0) 1033 return nfserr_bad_xdr; 1034 *share_access = w & NFS4_SHARE_ACCESS_MASK; 1035 *deleg_want = w & NFS4_SHARE_WANT_MASK; 1036 if (deleg_when) 1037 *deleg_when = w & NFS4_SHARE_WHEN_MASK; 1038 1039 switch (w & NFS4_SHARE_ACCESS_MASK) { 1040 case NFS4_SHARE_ACCESS_READ: 1041 case NFS4_SHARE_ACCESS_WRITE: 1042 case NFS4_SHARE_ACCESS_BOTH: 1043 break; 1044 default: 1045 return nfserr_bad_xdr; 1046 } 1047 w &= ~NFS4_SHARE_ACCESS_MASK; 1048 if (!w) 1049 return nfs_ok; 1050 if (!argp->minorversion) 1051 return nfserr_bad_xdr; 1052 switch (w & NFS4_SHARE_WANT_MASK) { 1053 case NFS4_SHARE_WANT_NO_PREFERENCE: 1054 case NFS4_SHARE_WANT_READ_DELEG: 1055 case NFS4_SHARE_WANT_WRITE_DELEG: 1056 case NFS4_SHARE_WANT_ANY_DELEG: 1057 case NFS4_SHARE_WANT_NO_DELEG: 1058 case NFS4_SHARE_WANT_CANCEL: 1059 break; 1060 default: 1061 return nfserr_bad_xdr; 1062 } 1063 w &= ~NFS4_SHARE_WANT_MASK; 1064 if (!w) 1065 return nfs_ok; 1066 1067 if (!deleg_when) /* open_downgrade */ 1068 return nfserr_inval; 1069 switch (w) { 1070 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL: 1071 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED: 1072 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL | 1073 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED): 1074 return nfs_ok; 1075 } 1076 return nfserr_bad_xdr; 1077 } 1078 1079 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x) 1080 { 1081 if (xdr_stream_decode_u32(argp->xdr, x) < 0) 1082 return nfserr_bad_xdr; 1083 /* Note: unlike access bits, deny bits may be zero. */ 1084 if (*x & ~NFS4_SHARE_DENY_BOTH) 1085 return nfserr_bad_xdr; 1086 1087 return nfs_ok; 1088 } 1089 1090 static __be32 1091 nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp, 1092 struct nfsd4_open *open) 1093 { 1094 __be32 status; 1095 1096 if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0) 1097 return nfserr_bad_xdr; 1098 switch (open->op_claim_type) { 1099 case NFS4_OPEN_CLAIM_NULL: 1100 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1101 status = nfsd4_decode_component4(argp, &open->op_fname, 1102 &open->op_fnamelen); 1103 if (status) 1104 return status; 1105 break; 1106 case NFS4_OPEN_CLAIM_PREVIOUS: 1107 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0) 1108 return nfserr_bad_xdr; 1109 break; 1110 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1111 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid); 1112 if (status) 1113 return status; 1114 status = nfsd4_decode_component4(argp, &open->op_fname, 1115 &open->op_fnamelen); 1116 if (status) 1117 return status; 1118 break; 1119 case NFS4_OPEN_CLAIM_FH: 1120 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1121 if (argp->minorversion < 1) 1122 return nfserr_bad_xdr; 1123 /* void */ 1124 break; 1125 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1126 if (argp->minorversion < 1) 1127 return nfserr_bad_xdr; 1128 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid); 1129 if (status) 1130 return status; 1131 break; 1132 default: 1133 return nfserr_bad_xdr; 1134 } 1135 1136 return nfs_ok; 1137 } 1138 1139 static __be32 1140 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 1141 { 1142 __be32 status; 1143 u32 dummy; 1144 1145 memset(open->op_bmval, 0, sizeof(open->op_bmval)); 1146 open->op_iattr.ia_valid = 0; 1147 open->op_openowner = NULL; 1148 1149 open->op_xdr_error = 0; 1150 if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0) 1151 return nfserr_bad_xdr; 1152 /* deleg_want is ignored */ 1153 status = nfsd4_decode_share_access(argp, &open->op_share_access, 1154 &open->op_deleg_want, &dummy); 1155 if (status) 1156 return status; 1157 status = nfsd4_decode_share_deny(argp, &open->op_share_deny); 1158 if (status) 1159 return status; 1160 status = nfsd4_decode_state_owner4(argp, &open->op_clientid, 1161 &open->op_owner); 1162 if (status) 1163 return status; 1164 status = nfsd4_decode_openflag4(argp, open); 1165 if (status) 1166 return status; 1167 return nfsd4_decode_open_claim4(argp, open); 1168 } 1169 1170 static __be32 1171 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf) 1172 { 1173 __be32 status; 1174 1175 if (argp->minorversion >= 1) 1176 return nfserr_notsupp; 1177 1178 status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid); 1179 if (status) 1180 return status; 1181 if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0) 1182 return nfserr_bad_xdr; 1183 1184 return nfs_ok; 1185 } 1186 1187 static __be32 1188 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down) 1189 { 1190 __be32 status; 1191 1192 status = nfsd4_decode_stateid4(argp, &open_down->od_stateid); 1193 if (status) 1194 return status; 1195 if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0) 1196 return nfserr_bad_xdr; 1197 /* deleg_want is ignored */ 1198 status = nfsd4_decode_share_access(argp, &open_down->od_share_access, 1199 &open_down->od_deleg_want, NULL); 1200 if (status) 1201 return status; 1202 return nfsd4_decode_share_deny(argp, &open_down->od_share_deny); 1203 } 1204 1205 static __be32 1206 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh) 1207 { 1208 __be32 *p; 1209 1210 if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0) 1211 return nfserr_bad_xdr; 1212 if (putfh->pf_fhlen > NFS4_FHSIZE) 1213 return nfserr_bad_xdr; 1214 p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen); 1215 if (!p) 1216 return nfserr_bad_xdr; 1217 putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen); 1218 if (!putfh->pf_fhval) 1219 return nfserr_jukebox; 1220 1221 return nfs_ok; 1222 } 1223 1224 static __be32 1225 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p) 1226 { 1227 if (argp->minorversion == 0) 1228 return nfs_ok; 1229 return nfserr_notsupp; 1230 } 1231 1232 static __be32 1233 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read) 1234 { 1235 __be32 status; 1236 1237 status = nfsd4_decode_stateid4(argp, &read->rd_stateid); 1238 if (status) 1239 return status; 1240 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0) 1241 return nfserr_bad_xdr; 1242 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0) 1243 return nfserr_bad_xdr; 1244 1245 return nfs_ok; 1246 } 1247 1248 static __be32 1249 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir) 1250 { 1251 __be32 status; 1252 1253 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0) 1254 return nfserr_bad_xdr; 1255 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf); 1256 if (status) 1257 return status; 1258 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0) 1259 return nfserr_bad_xdr; 1260 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0) 1261 return nfserr_bad_xdr; 1262 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval, 1263 ARRAY_SIZE(readdir->rd_bmval)) < 0) 1264 return nfserr_bad_xdr; 1265 1266 return nfs_ok; 1267 } 1268 1269 static __be32 1270 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove) 1271 { 1272 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen); 1273 } 1274 1275 static __be32 1276 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename) 1277 { 1278 __be32 status; 1279 1280 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen); 1281 if (status) 1282 return status; 1283 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen); 1284 } 1285 1286 static __be32 1287 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid) 1288 { 1289 return nfsd4_decode_clientid4(argp, clientid); 1290 } 1291 1292 static __be32 1293 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp, 1294 struct nfsd4_secinfo *secinfo) 1295 { 1296 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen); 1297 } 1298 1299 static __be32 1300 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr) 1301 { 1302 __be32 status; 1303 1304 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid); 1305 if (status) 1306 return status; 1307 return nfsd4_decode_fattr4(argp, setattr->sa_bmval, 1308 ARRAY_SIZE(setattr->sa_bmval), 1309 &setattr->sa_iattr, &setattr->sa_acl, 1310 &setattr->sa_label, NULL); 1311 } 1312 1313 static __be32 1314 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid) 1315 { 1316 __be32 *p, status; 1317 1318 if (argp->minorversion >= 1) 1319 return nfserr_notsupp; 1320 1321 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf); 1322 if (status) 1323 return status; 1324 status = nfsd4_decode_opaque(argp, &setclientid->se_name); 1325 if (status) 1326 return status; 1327 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0) 1328 return nfserr_bad_xdr; 1329 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0) 1330 return nfserr_bad_xdr; 1331 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len); 1332 if (!p) 1333 return nfserr_bad_xdr; 1334 setclientid->se_callback_netid_val = svcxdr_savemem(argp, p, 1335 setclientid->se_callback_netid_len); 1336 if (!setclientid->se_callback_netid_val) 1337 return nfserr_jukebox; 1338 1339 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0) 1340 return nfserr_bad_xdr; 1341 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len); 1342 if (!p) 1343 return nfserr_bad_xdr; 1344 setclientid->se_callback_addr_val = svcxdr_savemem(argp, p, 1345 setclientid->se_callback_addr_len); 1346 if (!setclientid->se_callback_addr_val) 1347 return nfserr_jukebox; 1348 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0) 1349 return nfserr_bad_xdr; 1350 1351 return nfs_ok; 1352 } 1353 1354 static __be32 1355 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c) 1356 { 1357 __be32 status; 1358 1359 if (argp->minorversion >= 1) 1360 return nfserr_notsupp; 1361 1362 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid); 1363 if (status) 1364 return status; 1365 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm); 1366 } 1367 1368 /* Also used for NVERIFY */ 1369 static __be32 1370 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify) 1371 { 1372 __be32 *p, status; 1373 1374 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval, 1375 ARRAY_SIZE(verify->ve_bmval)); 1376 if (status) 1377 return status; 1378 1379 /* For convenience's sake, we compare raw xdr'd attributes in 1380 * nfsd4_proc_verify */ 1381 1382 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0) 1383 return nfserr_bad_xdr; 1384 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen); 1385 if (!p) 1386 return nfserr_bad_xdr; 1387 verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen); 1388 if (!verify->ve_attrval) 1389 return nfserr_jukebox; 1390 1391 return nfs_ok; 1392 } 1393 1394 static __be32 1395 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) 1396 { 1397 __be32 status; 1398 1399 status = nfsd4_decode_stateid4(argp, &write->wr_stateid); 1400 if (status) 1401 return status; 1402 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0) 1403 return nfserr_bad_xdr; 1404 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0) 1405 return nfserr_bad_xdr; 1406 if (write->wr_stable_how > NFS_FILE_SYNC) 1407 return nfserr_bad_xdr; 1408 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0) 1409 return nfserr_bad_xdr; 1410 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen)) 1411 return nfserr_bad_xdr; 1412 1413 return nfs_ok; 1414 } 1415 1416 static __be32 1417 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner) 1418 { 1419 __be32 status; 1420 1421 if (argp->minorversion >= 1) 1422 return nfserr_notsupp; 1423 1424 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid, 1425 &rlockowner->rl_owner); 1426 if (status) 1427 return status; 1428 1429 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid)) 1430 return nfserr_inval; 1431 1432 return nfs_ok; 1433 } 1434 1435 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc) 1436 { 1437 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0) 1438 return nfserr_bad_xdr; 1439 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec); 1440 } 1441 1442 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts) 1443 { 1444 u32 use_conn_in_rdma_mode; 1445 __be32 status; 1446 1447 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid); 1448 if (status) 1449 return status; 1450 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0) 1451 return nfserr_bad_xdr; 1452 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0) 1453 return nfserr_bad_xdr; 1454 1455 return nfs_ok; 1456 } 1457 1458 static __be32 1459 nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp, 1460 struct nfsd4_exchange_id *exid) 1461 { 1462 __be32 status; 1463 1464 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce, 1465 ARRAY_SIZE(exid->spo_must_enforce)); 1466 if (status) 1467 return nfserr_bad_xdr; 1468 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow, 1469 ARRAY_SIZE(exid->spo_must_allow)); 1470 if (status) 1471 return nfserr_bad_xdr; 1472 1473 return nfs_ok; 1474 } 1475 1476 /* 1477 * This implementation currently does not support SP4_SSV. 1478 * This decoder simply skips over these arguments. 1479 */ 1480 static noinline __be32 1481 nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp, 1482 struct nfsd4_exchange_id *exid) 1483 { 1484 u32 count, window, num_gss_handles; 1485 __be32 status; 1486 1487 /* ssp_ops */ 1488 status = nfsd4_decode_state_protect_ops(argp, exid); 1489 if (status) 1490 return status; 1491 1492 /* ssp_hash_algs<> */ 1493 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1494 return nfserr_bad_xdr; 1495 while (count--) { 1496 status = nfsd4_decode_ignored_string(argp, 0); 1497 if (status) 1498 return status; 1499 } 1500 1501 /* ssp_encr_algs<> */ 1502 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1503 return nfserr_bad_xdr; 1504 while (count--) { 1505 status = nfsd4_decode_ignored_string(argp, 0); 1506 if (status) 1507 return status; 1508 } 1509 1510 if (xdr_stream_decode_u32(argp->xdr, &window) < 0) 1511 return nfserr_bad_xdr; 1512 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0) 1513 return nfserr_bad_xdr; 1514 1515 return nfs_ok; 1516 } 1517 1518 static __be32 1519 nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp, 1520 struct nfsd4_exchange_id *exid) 1521 { 1522 __be32 status; 1523 1524 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0) 1525 return nfserr_bad_xdr; 1526 switch (exid->spa_how) { 1527 case SP4_NONE: 1528 break; 1529 case SP4_MACH_CRED: 1530 status = nfsd4_decode_state_protect_ops(argp, exid); 1531 if (status) 1532 return status; 1533 break; 1534 case SP4_SSV: 1535 status = nfsd4_decode_ssv_sp_parms(argp, exid); 1536 if (status) 1537 return status; 1538 break; 1539 default: 1540 return nfserr_bad_xdr; 1541 } 1542 1543 return nfs_ok; 1544 } 1545 1546 static __be32 1547 nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp, 1548 struct nfsd4_exchange_id *exid) 1549 { 1550 __be32 status; 1551 u32 count; 1552 1553 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1554 return nfserr_bad_xdr; 1555 switch (count) { 1556 case 0: 1557 break; 1558 case 1: 1559 /* Note that RFC 8881 places no length limit on 1560 * nii_domain, but this implementation permits no 1561 * more than NFS4_OPAQUE_LIMIT bytes */ 1562 status = nfsd4_decode_opaque(argp, &exid->nii_domain); 1563 if (status) 1564 return status; 1565 /* Note that RFC 8881 places no length limit on 1566 * nii_name, but this implementation permits no 1567 * more than NFS4_OPAQUE_LIMIT bytes */ 1568 status = nfsd4_decode_opaque(argp, &exid->nii_name); 1569 if (status) 1570 return status; 1571 status = nfsd4_decode_nfstime4(argp, &exid->nii_time); 1572 if (status) 1573 return status; 1574 break; 1575 default: 1576 return nfserr_bad_xdr; 1577 } 1578 1579 return nfs_ok; 1580 } 1581 1582 static __be32 1583 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp, 1584 struct nfsd4_exchange_id *exid) 1585 { 1586 __be32 status; 1587 1588 status = nfsd4_decode_verifier4(argp, &exid->verifier); 1589 if (status) 1590 return status; 1591 status = nfsd4_decode_opaque(argp, &exid->clname); 1592 if (status) 1593 return status; 1594 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0) 1595 return nfserr_bad_xdr; 1596 status = nfsd4_decode_state_protect4_a(argp, exid); 1597 if (status) 1598 return status; 1599 return nfsd4_decode_nfs_impl_id4(argp, exid); 1600 } 1601 1602 static __be32 1603 nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp, 1604 struct nfsd4_channel_attrs *ca) 1605 { 1606 __be32 *p; 1607 1608 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7); 1609 if (!p) 1610 return nfserr_bad_xdr; 1611 1612 /* headerpadsz is ignored */ 1613 p++; 1614 ca->maxreq_sz = be32_to_cpup(p++); 1615 ca->maxresp_sz = be32_to_cpup(p++); 1616 ca->maxresp_cached = be32_to_cpup(p++); 1617 ca->maxops = be32_to_cpup(p++); 1618 ca->maxreqs = be32_to_cpup(p++); 1619 ca->nr_rdma_attrs = be32_to_cpup(p); 1620 switch (ca->nr_rdma_attrs) { 1621 case 0: 1622 break; 1623 case 1: 1624 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0) 1625 return nfserr_bad_xdr; 1626 break; 1627 default: 1628 return nfserr_bad_xdr; 1629 } 1630 1631 return nfs_ok; 1632 } 1633 1634 static __be32 1635 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, 1636 struct nfsd4_create_session *sess) 1637 { 1638 __be32 status; 1639 1640 status = nfsd4_decode_clientid4(argp, &sess->clientid); 1641 if (status) 1642 return status; 1643 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0) 1644 return nfserr_bad_xdr; 1645 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0) 1646 return nfserr_bad_xdr; 1647 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel); 1648 if (status) 1649 return status; 1650 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel); 1651 if (status) 1652 return status; 1653 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0) 1654 return nfserr_bad_xdr; 1655 status = nfsd4_decode_cb_sec(argp, &sess->cb_sec); 1656 if (status) 1657 return status; 1658 1659 return nfs_ok; 1660 } 1661 1662 static __be32 1663 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp, 1664 struct nfsd4_destroy_session *destroy_session) 1665 { 1666 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid); 1667 } 1668 1669 static __be32 1670 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp, 1671 struct nfsd4_free_stateid *free_stateid) 1672 { 1673 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid); 1674 } 1675 1676 #ifdef CONFIG_NFSD_PNFS 1677 static __be32 1678 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp, 1679 struct nfsd4_getdeviceinfo *gdev) 1680 { 1681 __be32 status; 1682 1683 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid); 1684 if (status) 1685 return status; 1686 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0) 1687 return nfserr_bad_xdr; 1688 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0) 1689 return nfserr_bad_xdr; 1690 if (xdr_stream_decode_uint32_array(argp->xdr, 1691 &gdev->gd_notify_types, 1) < 0) 1692 return nfserr_bad_xdr; 1693 1694 return nfs_ok; 1695 } 1696 1697 static __be32 1698 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp, 1699 struct nfsd4_layoutcommit *lcp) 1700 { 1701 __be32 *p, status; 1702 1703 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0) 1704 return nfserr_bad_xdr; 1705 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0) 1706 return nfserr_bad_xdr; 1707 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0) 1708 return nfserr_bad_xdr; 1709 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid); 1710 if (status) 1711 return status; 1712 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0) 1713 return nfserr_bad_xdr; 1714 if (lcp->lc_newoffset) { 1715 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0) 1716 return nfserr_bad_xdr; 1717 } else 1718 lcp->lc_last_wr = 0; 1719 p = xdr_inline_decode(argp->xdr, XDR_UNIT); 1720 if (!p) 1721 return nfserr_bad_xdr; 1722 if (xdr_item_is_present(p)) { 1723 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime); 1724 if (status) 1725 return status; 1726 } else { 1727 lcp->lc_mtime.tv_nsec = UTIME_NOW; 1728 } 1729 return nfsd4_decode_layoutupdate4(argp, lcp); 1730 } 1731 1732 static __be32 1733 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp, 1734 struct nfsd4_layoutget *lgp) 1735 { 1736 __be32 status; 1737 1738 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0) 1739 return nfserr_bad_xdr; 1740 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0) 1741 return nfserr_bad_xdr; 1742 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0) 1743 return nfserr_bad_xdr; 1744 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0) 1745 return nfserr_bad_xdr; 1746 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0) 1747 return nfserr_bad_xdr; 1748 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0) 1749 return nfserr_bad_xdr; 1750 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid); 1751 if (status) 1752 return status; 1753 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0) 1754 return nfserr_bad_xdr; 1755 1756 return nfs_ok; 1757 } 1758 1759 static __be32 1760 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp, 1761 struct nfsd4_layoutreturn *lrp) 1762 { 1763 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0) 1764 return nfserr_bad_xdr; 1765 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0) 1766 return nfserr_bad_xdr; 1767 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0) 1768 return nfserr_bad_xdr; 1769 return nfsd4_decode_layoutreturn4(argp, lrp); 1770 } 1771 #endif /* CONFIG_NFSD_PNFS */ 1772 1773 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp, 1774 struct nfsd4_secinfo_no_name *sin) 1775 { 1776 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0) 1777 return nfserr_bad_xdr; 1778 return nfs_ok; 1779 } 1780 1781 static __be32 1782 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp, 1783 struct nfsd4_sequence *seq) 1784 { 1785 __be32 *p, status; 1786 1787 status = nfsd4_decode_sessionid4(argp, &seq->sessionid); 1788 if (status) 1789 return status; 1790 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4); 1791 if (!p) 1792 return nfserr_bad_xdr; 1793 seq->seqid = be32_to_cpup(p++); 1794 seq->slotid = be32_to_cpup(p++); 1795 seq->maxslots = be32_to_cpup(p++); 1796 seq->cachethis = be32_to_cpup(p); 1797 1798 return nfs_ok; 1799 } 1800 1801 static __be32 1802 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid) 1803 { 1804 struct nfsd4_test_stateid_id *stateid; 1805 __be32 status; 1806 u32 i; 1807 1808 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0) 1809 return nfserr_bad_xdr; 1810 1811 INIT_LIST_HEAD(&test_stateid->ts_stateid_list); 1812 for (i = 0; i < test_stateid->ts_num_ids; i++) { 1813 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); 1814 if (!stateid) 1815 return nfserrno(-ENOMEM); /* XXX: not jukebox? */ 1816 INIT_LIST_HEAD(&stateid->ts_id_list); 1817 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); 1818 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid); 1819 if (status) 1820 return status; 1821 } 1822 1823 return nfs_ok; 1824 } 1825 1826 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, 1827 struct nfsd4_destroy_clientid *dc) 1828 { 1829 return nfsd4_decode_clientid4(argp, &dc->clientid); 1830 } 1831 1832 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, 1833 struct nfsd4_reclaim_complete *rc) 1834 { 1835 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0) 1836 return nfserr_bad_xdr; 1837 return nfs_ok; 1838 } 1839 1840 static __be32 1841 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp, 1842 struct nfsd4_fallocate *fallocate) 1843 { 1844 __be32 status; 1845 1846 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid); 1847 if (status) 1848 return status; 1849 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0) 1850 return nfserr_bad_xdr; 1851 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0) 1852 return nfserr_bad_xdr; 1853 1854 return nfs_ok; 1855 } 1856 1857 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp, 1858 struct nl4_server *ns) 1859 { 1860 struct nfs42_netaddr *naddr; 1861 __be32 *p; 1862 1863 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0) 1864 return nfserr_bad_xdr; 1865 1866 /* currently support for 1 inter-server source server */ 1867 switch (ns->nl4_type) { 1868 case NL4_NETADDR: 1869 naddr = &ns->u.nl4_addr; 1870 1871 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0) 1872 return nfserr_bad_xdr; 1873 if (naddr->netid_len > RPCBIND_MAXNETIDLEN) 1874 return nfserr_bad_xdr; 1875 1876 p = xdr_inline_decode(argp->xdr, naddr->netid_len); 1877 if (!p) 1878 return nfserr_bad_xdr; 1879 memcpy(naddr->netid, p, naddr->netid_len); 1880 1881 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0) 1882 return nfserr_bad_xdr; 1883 if (naddr->addr_len > RPCBIND_MAXUADDRLEN) 1884 return nfserr_bad_xdr; 1885 1886 p = xdr_inline_decode(argp->xdr, naddr->addr_len); 1887 if (!p) 1888 return nfserr_bad_xdr; 1889 memcpy(naddr->addr, p, naddr->addr_len); 1890 break; 1891 default: 1892 return nfserr_bad_xdr; 1893 } 1894 1895 return nfs_ok; 1896 } 1897 1898 static __be32 1899 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy) 1900 { 1901 struct nl4_server *ns_dummy; 1902 u32 consecutive, i, count; 1903 __be32 status; 1904 1905 status = nfsd4_decode_stateid4(argp, ©->cp_src_stateid); 1906 if (status) 1907 return status; 1908 status = nfsd4_decode_stateid4(argp, ©->cp_dst_stateid); 1909 if (status) 1910 return status; 1911 if (xdr_stream_decode_u64(argp->xdr, ©->cp_src_pos) < 0) 1912 return nfserr_bad_xdr; 1913 if (xdr_stream_decode_u64(argp->xdr, ©->cp_dst_pos) < 0) 1914 return nfserr_bad_xdr; 1915 if (xdr_stream_decode_u64(argp->xdr, ©->cp_count) < 0) 1916 return nfserr_bad_xdr; 1917 /* ca_consecutive: we always do consecutive copies */ 1918 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0) 1919 return nfserr_bad_xdr; 1920 if (xdr_stream_decode_u32(argp->xdr, ©->cp_synchronous) < 0) 1921 return nfserr_bad_xdr; 1922 1923 if (xdr_stream_decode_u32(argp->xdr, &count) < 0) 1924 return nfserr_bad_xdr; 1925 copy->cp_intra = false; 1926 if (count == 0) { /* intra-server copy */ 1927 copy->cp_intra = true; 1928 return nfs_ok; 1929 } 1930 1931 /* decode all the supplied server addresses but use only the first */ 1932 status = nfsd4_decode_nl4_server(argp, ©->cp_src); 1933 if (status) 1934 return status; 1935 1936 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL); 1937 if (ns_dummy == NULL) 1938 return nfserrno(-ENOMEM); /* XXX: jukebox? */ 1939 for (i = 0; i < count - 1; i++) { 1940 status = nfsd4_decode_nl4_server(argp, ns_dummy); 1941 if (status) { 1942 kfree(ns_dummy); 1943 return status; 1944 } 1945 } 1946 kfree(ns_dummy); 1947 1948 return nfs_ok; 1949 } 1950 1951 static __be32 1952 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp, 1953 struct nfsd4_copy_notify *cn) 1954 { 1955 __be32 status; 1956 1957 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid); 1958 if (status) 1959 return status; 1960 return nfsd4_decode_nl4_server(argp, &cn->cpn_dst); 1961 } 1962 1963 static __be32 1964 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp, 1965 struct nfsd4_offload_status *os) 1966 { 1967 return nfsd4_decode_stateid4(argp, &os->stateid); 1968 } 1969 1970 static __be32 1971 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek) 1972 { 1973 __be32 status; 1974 1975 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid); 1976 if (status) 1977 return status; 1978 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0) 1979 return nfserr_bad_xdr; 1980 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0) 1981 return nfserr_bad_xdr; 1982 1983 return nfs_ok; 1984 } 1985 1986 static __be32 1987 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone) 1988 { 1989 __be32 status; 1990 1991 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid); 1992 if (status) 1993 return status; 1994 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid); 1995 if (status) 1996 return status; 1997 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0) 1998 return nfserr_bad_xdr; 1999 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0) 2000 return nfserr_bad_xdr; 2001 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0) 2002 return nfserr_bad_xdr; 2003 2004 return nfs_ok; 2005 } 2006 2007 /* 2008 * XDR data that is more than PAGE_SIZE in size is normally part of a 2009 * read or write. However, the size of extended attributes is limited 2010 * by the maximum request size, and then further limited by the underlying 2011 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX 2012 * is 64k). Since there is no kvec- or page-based interface to xattrs, 2013 * and we're not dealing with contiguous pages, we need to do some copying. 2014 */ 2015 2016 /* 2017 * Decode data into buffer. 2018 */ 2019 static __be32 2020 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr, 2021 char **bufp, u32 buflen) 2022 { 2023 struct page **pages = xdr->pages; 2024 struct kvec *head = xdr->head; 2025 char *tmp, *dp; 2026 u32 len; 2027 2028 if (buflen <= head->iov_len) { 2029 /* 2030 * We're in luck, the head has enough space. Just return 2031 * the head, no need for copying. 2032 */ 2033 *bufp = head->iov_base; 2034 return 0; 2035 } 2036 2037 tmp = svcxdr_tmpalloc(argp, buflen); 2038 if (tmp == NULL) 2039 return nfserr_jukebox; 2040 2041 dp = tmp; 2042 memcpy(dp, head->iov_base, head->iov_len); 2043 buflen -= head->iov_len; 2044 dp += head->iov_len; 2045 2046 while (buflen > 0) { 2047 len = min_t(u32, buflen, PAGE_SIZE); 2048 memcpy(dp, page_address(*pages), len); 2049 2050 buflen -= len; 2051 dp += len; 2052 pages++; 2053 } 2054 2055 *bufp = tmp; 2056 return 0; 2057 } 2058 2059 /* 2060 * Get a user extended attribute name from the XDR buffer. 2061 * It will not have the "user." prefix, so prepend it. 2062 * Lastly, check for nul characters in the name. 2063 */ 2064 static __be32 2065 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep) 2066 { 2067 char *name, *sp, *dp; 2068 u32 namelen, cnt; 2069 __be32 *p; 2070 2071 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0) 2072 return nfserr_bad_xdr; 2073 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN)) 2074 return nfserr_nametoolong; 2075 if (namelen == 0) 2076 return nfserr_bad_xdr; 2077 p = xdr_inline_decode(argp->xdr, namelen); 2078 if (!p) 2079 return nfserr_bad_xdr; 2080 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1); 2081 if (!name) 2082 return nfserr_jukebox; 2083 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); 2084 2085 /* 2086 * Copy the extended attribute name over while checking for 0 2087 * characters. 2088 */ 2089 sp = (char *)p; 2090 dp = name + XATTR_USER_PREFIX_LEN; 2091 cnt = namelen; 2092 2093 while (cnt-- > 0) { 2094 if (*sp == '\0') 2095 return nfserr_bad_xdr; 2096 *dp++ = *sp++; 2097 } 2098 *dp = '\0'; 2099 2100 *namep = name; 2101 2102 return nfs_ok; 2103 } 2104 2105 /* 2106 * A GETXATTR op request comes without a length specifier. We just set the 2107 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum 2108 * channel reply size. nfsd_getxattr will probe the length of the xattr, 2109 * check it against getxa_len, and allocate + return the value. 2110 */ 2111 static __be32 2112 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp, 2113 struct nfsd4_getxattr *getxattr) 2114 { 2115 __be32 status; 2116 u32 maxcount; 2117 2118 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name); 2119 if (status) 2120 return status; 2121 2122 maxcount = svc_max_payload(argp->rqstp); 2123 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2124 2125 getxattr->getxa_len = maxcount; 2126 2127 return status; 2128 } 2129 2130 static __be32 2131 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp, 2132 struct nfsd4_setxattr *setxattr) 2133 { 2134 u32 flags, maxcount, size; 2135 __be32 status; 2136 2137 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0) 2138 return nfserr_bad_xdr; 2139 2140 if (flags > SETXATTR4_REPLACE) 2141 return nfserr_inval; 2142 setxattr->setxa_flags = flags; 2143 2144 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name); 2145 if (status) 2146 return status; 2147 2148 maxcount = svc_max_payload(argp->rqstp); 2149 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount); 2150 2151 if (xdr_stream_decode_u32(argp->xdr, &size) < 0) 2152 return nfserr_bad_xdr; 2153 if (size > maxcount) 2154 return nfserr_xattr2big; 2155 2156 setxattr->setxa_len = size; 2157 if (size > 0) { 2158 struct xdr_buf payload; 2159 2160 if (!xdr_stream_subsegment(argp->xdr, &payload, size)) 2161 return nfserr_bad_xdr; 2162 status = nfsd4_vbuf_from_vector(argp, &payload, 2163 &setxattr->setxa_buf, size); 2164 } 2165 2166 return nfs_ok; 2167 } 2168 2169 static __be32 2170 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp, 2171 struct nfsd4_listxattrs *listxattrs) 2172 { 2173 u32 maxcount; 2174 2175 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0) 2176 return nfserr_bad_xdr; 2177 2178 /* 2179 * If the cookie is too large to have even one user.x attribute 2180 * plus trailing '\0' left in a maximum size buffer, it's invalid. 2181 */ 2182 if (listxattrs->lsxa_cookie >= 2183 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2))) 2184 return nfserr_badcookie; 2185 2186 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0) 2187 return nfserr_bad_xdr; 2188 if (maxcount < 8) 2189 /* Always need at least 2 words (length and one character) */ 2190 return nfserr_inval; 2191 2192 maxcount = min(maxcount, svc_max_payload(argp->rqstp)); 2193 listxattrs->lsxa_maxcount = maxcount; 2194 2195 return nfs_ok; 2196 } 2197 2198 static __be32 2199 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp, 2200 struct nfsd4_removexattr *removexattr) 2201 { 2202 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name); 2203 } 2204 2205 static __be32 2206 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p) 2207 { 2208 return nfs_ok; 2209 } 2210 2211 static __be32 2212 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p) 2213 { 2214 return nfserr_notsupp; 2215 } 2216 2217 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *); 2218 2219 static const nfsd4_dec nfsd4_dec_ops[] = { 2220 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access, 2221 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close, 2222 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit, 2223 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create, 2224 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp, 2225 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn, 2226 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr, 2227 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop, 2228 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link, 2229 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock, 2230 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt, 2231 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku, 2232 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup, 2233 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop, 2234 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify, 2235 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open, 2236 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp, 2237 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm, 2238 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade, 2239 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh, 2240 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh, 2241 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop, 2242 [OP_READ] = (nfsd4_dec)nfsd4_decode_read, 2243 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir, 2244 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop, 2245 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove, 2246 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename, 2247 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew, 2248 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop, 2249 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop, 2250 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo, 2251 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr, 2252 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid, 2253 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm, 2254 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify, 2255 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write, 2256 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner, 2257 2258 /* new operations for NFSv4.1 */ 2259 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl, 2260 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session, 2261 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id, 2262 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session, 2263 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session, 2264 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid, 2265 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 2266 #ifdef CONFIG_NFSD_PNFS 2267 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo, 2268 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 2269 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit, 2270 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget, 2271 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn, 2272 #else 2273 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp, 2274 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 2275 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp, 2276 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp, 2277 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp, 2278 #endif 2279 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name, 2280 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence, 2281 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp, 2282 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid, 2283 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 2284 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid, 2285 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete, 2286 2287 /* new operations for NFSv4.2 */ 2288 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 2289 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy, 2290 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_copy_notify, 2291 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 2292 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp, 2293 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp, 2294 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp, 2295 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_offload_status, 2296 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_offload_status, 2297 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_read, 2298 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek, 2299 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp, 2300 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone, 2301 /* RFC 8276 extended atributes operations */ 2302 [OP_GETXATTR] = (nfsd4_dec)nfsd4_decode_getxattr, 2303 [OP_SETXATTR] = (nfsd4_dec)nfsd4_decode_setxattr, 2304 [OP_LISTXATTRS] = (nfsd4_dec)nfsd4_decode_listxattrs, 2305 [OP_REMOVEXATTR] = (nfsd4_dec)nfsd4_decode_removexattr, 2306 }; 2307 2308 static inline bool 2309 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op) 2310 { 2311 if (op->opnum < FIRST_NFS4_OP) 2312 return false; 2313 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP) 2314 return false; 2315 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP) 2316 return false; 2317 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP) 2318 return false; 2319 return true; 2320 } 2321 2322 static bool 2323 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 2324 { 2325 struct nfsd4_op *op; 2326 bool cachethis = false; 2327 int auth_slack= argp->rqstp->rq_auth_slack; 2328 int max_reply = auth_slack + 8; /* opcnt, status */ 2329 int readcount = 0; 2330 int readbytes = 0; 2331 __be32 *p; 2332 int i; 2333 2334 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0) 2335 return false; 2336 max_reply += XDR_UNIT; 2337 argp->tag = NULL; 2338 if (unlikely(argp->taglen)) { 2339 if (argp->taglen > NFSD4_MAX_TAGLEN) 2340 return false; 2341 p = xdr_inline_decode(argp->xdr, argp->taglen); 2342 if (!p) 2343 return false; 2344 argp->tag = svcxdr_savemem(argp, p, argp->taglen); 2345 if (!argp->tag) 2346 return false; 2347 max_reply += xdr_align_size(argp->taglen); 2348 } 2349 2350 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0) 2351 return false; 2352 if (xdr_stream_decode_u32(argp->xdr, &argp->opcnt) < 0) 2353 return false; 2354 2355 /* 2356 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS 2357 * here, so we return success at the xdr level so that 2358 * nfsd4_proc can handle this is an NFS-level error. 2359 */ 2360 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND) 2361 return true; 2362 2363 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { 2364 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); 2365 if (!argp->ops) { 2366 argp->ops = argp->iops; 2367 dprintk("nfsd: couldn't allocate room for COMPOUND\n"); 2368 return false; 2369 } 2370 } 2371 2372 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 2373 argp->opcnt = 0; 2374 2375 for (i = 0; i < argp->opcnt; i++) { 2376 op = &argp->ops[i]; 2377 op->replay = NULL; 2378 2379 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0) 2380 return false; 2381 if (nfsd4_opnum_in_range(argp, op)) { 2382 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u); 2383 if (op->status != nfs_ok) 2384 trace_nfsd_compound_decode_err(argp->rqstp, 2385 argp->opcnt, i, 2386 op->opnum, 2387 op->status); 2388 } else { 2389 op->opnum = OP_ILLEGAL; 2390 op->status = nfserr_op_illegal; 2391 } 2392 op->opdesc = OPDESC(op); 2393 /* 2394 * We'll try to cache the result in the DRC if any one 2395 * op in the compound wants to be cached: 2396 */ 2397 cachethis |= nfsd4_cache_this_op(op); 2398 2399 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) { 2400 readcount++; 2401 readbytes += nfsd4_max_reply(argp->rqstp, op); 2402 } else 2403 max_reply += nfsd4_max_reply(argp->rqstp, op); 2404 /* 2405 * OP_LOCK and OP_LOCKT may return a conflicting lock. 2406 * (Special case because it will just skip encoding this 2407 * if it runs out of xdr buffer space, and it is the only 2408 * operation that behaves this way.) 2409 */ 2410 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT) 2411 max_reply += NFS4_OPAQUE_LIMIT; 2412 2413 if (op->status) { 2414 argp->opcnt = i+1; 2415 break; 2416 } 2417 } 2418 /* Sessions make the DRC unnecessary: */ 2419 if (argp->minorversion) 2420 cachethis = false; 2421 svc_reserve(argp->rqstp, max_reply + readbytes); 2422 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE; 2423 2424 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack) 2425 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags); 2426 2427 return true; 2428 } 2429 2430 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode, 2431 struct svc_export *exp) 2432 { 2433 if (exp->ex_flags & NFSEXP_V4ROOT) { 2434 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time)); 2435 *p++ = 0; 2436 } else 2437 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode)); 2438 return p; 2439 } 2440 2441 /* 2442 * ctime (in NFSv4, time_metadata) is not writeable, and the client 2443 * doesn't really care what resolution could theoretically be stored by 2444 * the filesystem. 2445 * 2446 * The client cares how close together changes can be while still 2447 * guaranteeing ctime changes. For most filesystems (which have 2448 * timestamps with nanosecond fields) that is limited by the resolution 2449 * of the time returned from current_time() (which I'm assuming to be 2450 * 1/HZ). 2451 */ 2452 static __be32 *encode_time_delta(__be32 *p, struct inode *inode) 2453 { 2454 struct timespec64 ts; 2455 u32 ns; 2456 2457 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran); 2458 ts = ns_to_timespec64(ns); 2459 2460 p = xdr_encode_hyper(p, ts.tv_sec); 2461 *p++ = cpu_to_be32(ts.tv_nsec); 2462 2463 return p; 2464 } 2465 2466 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c) 2467 { 2468 *p++ = cpu_to_be32(c->atomic); 2469 p = xdr_encode_hyper(p, c->before_change); 2470 p = xdr_encode_hyper(p, c->after_change); 2471 return p; 2472 } 2473 2474 /* Encode as an array of strings the string given with components 2475 * separated @sep, escaped with esc_enter and esc_exit. 2476 */ 2477 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep, 2478 char *components, char esc_enter, 2479 char esc_exit) 2480 { 2481 __be32 *p; 2482 __be32 pathlen; 2483 int pathlen_offset; 2484 int strlen, count=0; 2485 char *str, *end, *next; 2486 2487 dprintk("nfsd4_encode_components(%s)\n", components); 2488 2489 pathlen_offset = xdr->buf->len; 2490 p = xdr_reserve_space(xdr, 4); 2491 if (!p) 2492 return nfserr_resource; 2493 p++; /* We will fill this in with @count later */ 2494 2495 end = str = components; 2496 while (*end) { 2497 bool found_esc = false; 2498 2499 /* try to parse as esc_start, ..., esc_end, sep */ 2500 if (*str == esc_enter) { 2501 for (; *end && (*end != esc_exit); end++) 2502 /* find esc_exit or end of string */; 2503 next = end + 1; 2504 if (*end && (!*next || *next == sep)) { 2505 str++; 2506 found_esc = true; 2507 } 2508 } 2509 2510 if (!found_esc) 2511 for (; *end && (*end != sep); end++) 2512 /* find sep or end of string */; 2513 2514 strlen = end - str; 2515 if (strlen) { 2516 p = xdr_reserve_space(xdr, strlen + 4); 2517 if (!p) 2518 return nfserr_resource; 2519 p = xdr_encode_opaque(p, str, strlen); 2520 count++; 2521 } 2522 else 2523 end++; 2524 if (found_esc) 2525 end = next; 2526 2527 str = end; 2528 } 2529 pathlen = htonl(count); 2530 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4); 2531 return 0; 2532 } 2533 2534 /* Encode as an array of strings the string given with components 2535 * separated @sep. 2536 */ 2537 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep, 2538 char *components) 2539 { 2540 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0); 2541 } 2542 2543 /* 2544 * encode a location element of a fs_locations structure 2545 */ 2546 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr, 2547 struct nfsd4_fs_location *location) 2548 { 2549 __be32 status; 2550 2551 status = nfsd4_encode_components_esc(xdr, ':', location->hosts, 2552 '[', ']'); 2553 if (status) 2554 return status; 2555 status = nfsd4_encode_components(xdr, '/', location->path); 2556 if (status) 2557 return status; 2558 return 0; 2559 } 2560 2561 /* 2562 * Encode a path in RFC3530 'pathname4' format 2563 */ 2564 static __be32 nfsd4_encode_path(struct xdr_stream *xdr, 2565 const struct path *root, 2566 const struct path *path) 2567 { 2568 struct path cur = *path; 2569 __be32 *p; 2570 struct dentry **components = NULL; 2571 unsigned int ncomponents = 0; 2572 __be32 err = nfserr_jukebox; 2573 2574 dprintk("nfsd4_encode_components("); 2575 2576 path_get(&cur); 2577 /* First walk the path up to the nfsd root, and store the 2578 * dentries/path components in an array. 2579 */ 2580 for (;;) { 2581 if (path_equal(&cur, root)) 2582 break; 2583 if (cur.dentry == cur.mnt->mnt_root) { 2584 if (follow_up(&cur)) 2585 continue; 2586 goto out_free; 2587 } 2588 if ((ncomponents & 15) == 0) { 2589 struct dentry **new; 2590 new = krealloc(components, 2591 sizeof(*new) * (ncomponents + 16), 2592 GFP_KERNEL); 2593 if (!new) 2594 goto out_free; 2595 components = new; 2596 } 2597 components[ncomponents++] = cur.dentry; 2598 cur.dentry = dget_parent(cur.dentry); 2599 } 2600 err = nfserr_resource; 2601 p = xdr_reserve_space(xdr, 4); 2602 if (!p) 2603 goto out_free; 2604 *p++ = cpu_to_be32(ncomponents); 2605 2606 while (ncomponents) { 2607 struct dentry *dentry = components[ncomponents - 1]; 2608 unsigned int len; 2609 2610 spin_lock(&dentry->d_lock); 2611 len = dentry->d_name.len; 2612 p = xdr_reserve_space(xdr, len + 4); 2613 if (!p) { 2614 spin_unlock(&dentry->d_lock); 2615 goto out_free; 2616 } 2617 p = xdr_encode_opaque(p, dentry->d_name.name, len); 2618 dprintk("/%pd", dentry); 2619 spin_unlock(&dentry->d_lock); 2620 dput(dentry); 2621 ncomponents--; 2622 } 2623 2624 err = 0; 2625 out_free: 2626 dprintk(")\n"); 2627 while (ncomponents) 2628 dput(components[--ncomponents]); 2629 kfree(components); 2630 path_put(&cur); 2631 return err; 2632 } 2633 2634 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr, 2635 struct svc_rqst *rqstp, const struct path *path) 2636 { 2637 struct svc_export *exp_ps; 2638 __be32 res; 2639 2640 exp_ps = rqst_find_fsidzero_export(rqstp); 2641 if (IS_ERR(exp_ps)) 2642 return nfserrno(PTR_ERR(exp_ps)); 2643 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path); 2644 exp_put(exp_ps); 2645 return res; 2646 } 2647 2648 /* 2649 * encode a fs_locations structure 2650 */ 2651 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr, 2652 struct svc_rqst *rqstp, struct svc_export *exp) 2653 { 2654 __be32 status; 2655 int i; 2656 __be32 *p; 2657 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; 2658 2659 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path); 2660 if (status) 2661 return status; 2662 p = xdr_reserve_space(xdr, 4); 2663 if (!p) 2664 return nfserr_resource; 2665 *p++ = cpu_to_be32(fslocs->locations_count); 2666 for (i=0; i<fslocs->locations_count; i++) { 2667 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]); 2668 if (status) 2669 return status; 2670 } 2671 return 0; 2672 } 2673 2674 static u32 nfs4_file_type(umode_t mode) 2675 { 2676 switch (mode & S_IFMT) { 2677 case S_IFIFO: return NF4FIFO; 2678 case S_IFCHR: return NF4CHR; 2679 case S_IFDIR: return NF4DIR; 2680 case S_IFBLK: return NF4BLK; 2681 case S_IFLNK: return NF4LNK; 2682 case S_IFREG: return NF4REG; 2683 case S_IFSOCK: return NF4SOCK; 2684 default: return NF4BAD; 2685 } 2686 } 2687 2688 static inline __be32 2689 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2690 struct nfs4_ace *ace) 2691 { 2692 if (ace->whotype != NFS4_ACL_WHO_NAMED) 2693 return nfs4_acl_write_who(xdr, ace->whotype); 2694 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 2695 return nfsd4_encode_group(xdr, rqstp, ace->who_gid); 2696 else 2697 return nfsd4_encode_user(xdr, rqstp, ace->who_uid); 2698 } 2699 2700 static inline __be32 2701 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types) 2702 { 2703 __be32 *p; 2704 unsigned long i = hweight_long(layout_types); 2705 2706 p = xdr_reserve_space(xdr, 4 + 4 * i); 2707 if (!p) 2708 return nfserr_resource; 2709 2710 *p++ = cpu_to_be32(i); 2711 2712 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 2713 if (layout_types & (1 << i)) 2714 *p++ = cpu_to_be32(i); 2715 2716 return 0; 2717 } 2718 2719 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ 2720 FATTR4_WORD0_RDATTR_ERROR) 2721 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID 2722 #define WORD2_ABSENT_FS_ATTRS 0 2723 2724 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2725 static inline __be32 2726 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2727 void *context, int len) 2728 { 2729 __be32 *p; 2730 2731 p = xdr_reserve_space(xdr, len + 4 + 4 + 4); 2732 if (!p) 2733 return nfserr_resource; 2734 2735 /* 2736 * For now we use a 0 here to indicate the null translation; in 2737 * the future we may place a call to translation code here. 2738 */ 2739 *p++ = cpu_to_be32(0); /* lfs */ 2740 *p++ = cpu_to_be32(0); /* pi */ 2741 p = xdr_encode_opaque(p, context, len); 2742 return 0; 2743 } 2744 #else 2745 static inline __be32 2746 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2747 void *context, int len) 2748 { return 0; } 2749 #endif 2750 2751 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err) 2752 { 2753 /* As per referral draft: */ 2754 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || 2755 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { 2756 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || 2757 *bmval0 & FATTR4_WORD0_FS_LOCATIONS) 2758 *rdattr_err = NFSERR_MOVED; 2759 else 2760 return nfserr_moved; 2761 } 2762 *bmval0 &= WORD0_ABSENT_FS_ATTRS; 2763 *bmval1 &= WORD1_ABSENT_FS_ATTRS; 2764 *bmval2 &= WORD2_ABSENT_FS_ATTRS; 2765 return 0; 2766 } 2767 2768 2769 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat) 2770 { 2771 struct path path = exp->ex_path; 2772 int err; 2773 2774 path_get(&path); 2775 while (follow_up(&path)) { 2776 if (path.dentry != path.mnt->mnt_root) 2777 break; 2778 } 2779 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2780 path_put(&path); 2781 return err; 2782 } 2783 2784 static __be32 2785 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2) 2786 { 2787 __be32 *p; 2788 2789 if (bmval2) { 2790 p = xdr_reserve_space(xdr, 16); 2791 if (!p) 2792 goto out_resource; 2793 *p++ = cpu_to_be32(3); 2794 *p++ = cpu_to_be32(bmval0); 2795 *p++ = cpu_to_be32(bmval1); 2796 *p++ = cpu_to_be32(bmval2); 2797 } else if (bmval1) { 2798 p = xdr_reserve_space(xdr, 12); 2799 if (!p) 2800 goto out_resource; 2801 *p++ = cpu_to_be32(2); 2802 *p++ = cpu_to_be32(bmval0); 2803 *p++ = cpu_to_be32(bmval1); 2804 } else { 2805 p = xdr_reserve_space(xdr, 8); 2806 if (!p) 2807 goto out_resource; 2808 *p++ = cpu_to_be32(1); 2809 *p++ = cpu_to_be32(bmval0); 2810 } 2811 2812 return 0; 2813 out_resource: 2814 return nfserr_resource; 2815 } 2816 2817 /* 2818 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 2819 * ourselves. 2820 */ 2821 static __be32 2822 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, 2823 struct svc_export *exp, 2824 struct dentry *dentry, u32 *bmval, 2825 struct svc_rqst *rqstp, int ignore_crossmnt) 2826 { 2827 u32 bmval0 = bmval[0]; 2828 u32 bmval1 = bmval[1]; 2829 u32 bmval2 = bmval[2]; 2830 struct kstat stat; 2831 struct svc_fh *tempfh = NULL; 2832 struct kstatfs statfs; 2833 __be32 *p; 2834 int starting_len = xdr->buf->len; 2835 int attrlen_offset; 2836 __be32 attrlen; 2837 u32 dummy; 2838 u64 dummy64; 2839 u32 rdattr_err = 0; 2840 __be32 status; 2841 int err; 2842 struct nfs4_acl *acl = NULL; 2843 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2844 void *context = NULL; 2845 int contextlen; 2846 #endif 2847 bool contextsupport = false; 2848 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2849 u32 minorversion = resp->cstate.minorversion; 2850 struct path path = { 2851 .mnt = exp->ex_path.mnt, 2852 .dentry = dentry, 2853 }; 2854 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2855 2856 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); 2857 BUG_ON(!nfsd_attrs_supported(minorversion, bmval)); 2858 2859 if (exp->ex_fslocs.migrated) { 2860 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err); 2861 if (status) 2862 goto out; 2863 } 2864 2865 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2866 if (err) 2867 goto out_nfserr; 2868 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE | 2869 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || 2870 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 2871 FATTR4_WORD1_SPACE_TOTAL))) { 2872 err = vfs_statfs(&path, &statfs); 2873 if (err) 2874 goto out_nfserr; 2875 } 2876 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { 2877 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); 2878 status = nfserr_jukebox; 2879 if (!tempfh) 2880 goto out; 2881 fh_init(tempfh, NFS4_FHSIZE); 2882 status = fh_compose(tempfh, exp, dentry, NULL); 2883 if (status) 2884 goto out; 2885 fhp = tempfh; 2886 } 2887 if (bmval0 & FATTR4_WORD0_ACL) { 2888 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); 2889 if (err == -EOPNOTSUPP) 2890 bmval0 &= ~FATTR4_WORD0_ACL; 2891 else if (err == -EINVAL) { 2892 status = nfserr_attrnotsupp; 2893 goto out; 2894 } else if (err != 0) 2895 goto out_nfserr; 2896 } 2897 2898 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2899 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) || 2900 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2901 if (exp->ex_flags & NFSEXP_SECURITY_LABEL) 2902 err = security_inode_getsecctx(d_inode(dentry), 2903 &context, &contextlen); 2904 else 2905 err = -EOPNOTSUPP; 2906 contextsupport = (err == 0); 2907 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2908 if (err == -EOPNOTSUPP) 2909 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL; 2910 else if (err) 2911 goto out_nfserr; 2912 } 2913 } 2914 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2915 2916 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2); 2917 if (status) 2918 goto out; 2919 2920 attrlen_offset = xdr->buf->len; 2921 p = xdr_reserve_space(xdr, 4); 2922 if (!p) 2923 goto out_resource; 2924 p++; /* to be backfilled later */ 2925 2926 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2927 u32 supp[3]; 2928 2929 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2930 2931 if (!IS_POSIXACL(dentry->d_inode)) 2932 supp[0] &= ~FATTR4_WORD0_ACL; 2933 if (!contextsupport) 2934 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2935 if (!supp[2]) { 2936 p = xdr_reserve_space(xdr, 12); 2937 if (!p) 2938 goto out_resource; 2939 *p++ = cpu_to_be32(2); 2940 *p++ = cpu_to_be32(supp[0]); 2941 *p++ = cpu_to_be32(supp[1]); 2942 } else { 2943 p = xdr_reserve_space(xdr, 16); 2944 if (!p) 2945 goto out_resource; 2946 *p++ = cpu_to_be32(3); 2947 *p++ = cpu_to_be32(supp[0]); 2948 *p++ = cpu_to_be32(supp[1]); 2949 *p++ = cpu_to_be32(supp[2]); 2950 } 2951 } 2952 if (bmval0 & FATTR4_WORD0_TYPE) { 2953 p = xdr_reserve_space(xdr, 4); 2954 if (!p) 2955 goto out_resource; 2956 dummy = nfs4_file_type(stat.mode); 2957 if (dummy == NF4BAD) { 2958 status = nfserr_serverfault; 2959 goto out; 2960 } 2961 *p++ = cpu_to_be32(dummy); 2962 } 2963 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { 2964 p = xdr_reserve_space(xdr, 4); 2965 if (!p) 2966 goto out_resource; 2967 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 2968 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT); 2969 else 2970 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT| 2971 NFS4_FH_VOL_RENAME); 2972 } 2973 if (bmval0 & FATTR4_WORD0_CHANGE) { 2974 p = xdr_reserve_space(xdr, 8); 2975 if (!p) 2976 goto out_resource; 2977 p = encode_change(p, &stat, d_inode(dentry), exp); 2978 } 2979 if (bmval0 & FATTR4_WORD0_SIZE) { 2980 p = xdr_reserve_space(xdr, 8); 2981 if (!p) 2982 goto out_resource; 2983 p = xdr_encode_hyper(p, stat.size); 2984 } 2985 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { 2986 p = xdr_reserve_space(xdr, 4); 2987 if (!p) 2988 goto out_resource; 2989 *p++ = cpu_to_be32(1); 2990 } 2991 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { 2992 p = xdr_reserve_space(xdr, 4); 2993 if (!p) 2994 goto out_resource; 2995 *p++ = cpu_to_be32(1); 2996 } 2997 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { 2998 p = xdr_reserve_space(xdr, 4); 2999 if (!p) 3000 goto out_resource; 3001 *p++ = cpu_to_be32(0); 3002 } 3003 if (bmval0 & FATTR4_WORD0_FSID) { 3004 p = xdr_reserve_space(xdr, 16); 3005 if (!p) 3006 goto out_resource; 3007 if (exp->ex_fslocs.migrated) { 3008 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR); 3009 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR); 3010 } else switch(fsid_source(fhp)) { 3011 case FSIDSOURCE_FSID: 3012 p = xdr_encode_hyper(p, (u64)exp->ex_fsid); 3013 p = xdr_encode_hyper(p, (u64)0); 3014 break; 3015 case FSIDSOURCE_DEV: 3016 *p++ = cpu_to_be32(0); 3017 *p++ = cpu_to_be32(MAJOR(stat.dev)); 3018 *p++ = cpu_to_be32(0); 3019 *p++ = cpu_to_be32(MINOR(stat.dev)); 3020 break; 3021 case FSIDSOURCE_UUID: 3022 p = xdr_encode_opaque_fixed(p, exp->ex_uuid, 3023 EX_UUID_LEN); 3024 break; 3025 } 3026 } 3027 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { 3028 p = xdr_reserve_space(xdr, 4); 3029 if (!p) 3030 goto out_resource; 3031 *p++ = cpu_to_be32(0); 3032 } 3033 if (bmval0 & FATTR4_WORD0_LEASE_TIME) { 3034 p = xdr_reserve_space(xdr, 4); 3035 if (!p) 3036 goto out_resource; 3037 *p++ = cpu_to_be32(nn->nfsd4_lease); 3038 } 3039 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { 3040 p = xdr_reserve_space(xdr, 4); 3041 if (!p) 3042 goto out_resource; 3043 *p++ = cpu_to_be32(rdattr_err); 3044 } 3045 if (bmval0 & FATTR4_WORD0_ACL) { 3046 struct nfs4_ace *ace; 3047 3048 if (acl == NULL) { 3049 p = xdr_reserve_space(xdr, 4); 3050 if (!p) 3051 goto out_resource; 3052 3053 *p++ = cpu_to_be32(0); 3054 goto out_acl; 3055 } 3056 p = xdr_reserve_space(xdr, 4); 3057 if (!p) 3058 goto out_resource; 3059 *p++ = cpu_to_be32(acl->naces); 3060 3061 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 3062 p = xdr_reserve_space(xdr, 4*3); 3063 if (!p) 3064 goto out_resource; 3065 *p++ = cpu_to_be32(ace->type); 3066 *p++ = cpu_to_be32(ace->flag); 3067 *p++ = cpu_to_be32(ace->access_mask & 3068 NFS4_ACE_MASK_ALL); 3069 status = nfsd4_encode_aclname(xdr, rqstp, ace); 3070 if (status) 3071 goto out; 3072 } 3073 } 3074 out_acl: 3075 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { 3076 p = xdr_reserve_space(xdr, 4); 3077 if (!p) 3078 goto out_resource; 3079 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ? 3080 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); 3081 } 3082 if (bmval0 & FATTR4_WORD0_CANSETTIME) { 3083 p = xdr_reserve_space(xdr, 4); 3084 if (!p) 3085 goto out_resource; 3086 *p++ = cpu_to_be32(1); 3087 } 3088 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { 3089 p = xdr_reserve_space(xdr, 4); 3090 if (!p) 3091 goto out_resource; 3092 *p++ = cpu_to_be32(0); 3093 } 3094 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { 3095 p = xdr_reserve_space(xdr, 4); 3096 if (!p) 3097 goto out_resource; 3098 *p++ = cpu_to_be32(1); 3099 } 3100 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { 3101 p = xdr_reserve_space(xdr, 4); 3102 if (!p) 3103 goto out_resource; 3104 *p++ = cpu_to_be32(1); 3105 } 3106 if (bmval0 & FATTR4_WORD0_FILEHANDLE) { 3107 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4); 3108 if (!p) 3109 goto out_resource; 3110 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, 3111 fhp->fh_handle.fh_size); 3112 } 3113 if (bmval0 & FATTR4_WORD0_FILEID) { 3114 p = xdr_reserve_space(xdr, 8); 3115 if (!p) 3116 goto out_resource; 3117 p = xdr_encode_hyper(p, stat.ino); 3118 } 3119 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { 3120 p = xdr_reserve_space(xdr, 8); 3121 if (!p) 3122 goto out_resource; 3123 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 3124 } 3125 if (bmval0 & FATTR4_WORD0_FILES_FREE) { 3126 p = xdr_reserve_space(xdr, 8); 3127 if (!p) 3128 goto out_resource; 3129 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 3130 } 3131 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { 3132 p = xdr_reserve_space(xdr, 8); 3133 if (!p) 3134 goto out_resource; 3135 p = xdr_encode_hyper(p, (u64) statfs.f_files); 3136 } 3137 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) { 3138 status = nfsd4_encode_fs_locations(xdr, rqstp, exp); 3139 if (status) 3140 goto out; 3141 } 3142 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { 3143 p = xdr_reserve_space(xdr, 4); 3144 if (!p) 3145 goto out_resource; 3146 *p++ = cpu_to_be32(1); 3147 } 3148 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { 3149 p = xdr_reserve_space(xdr, 8); 3150 if (!p) 3151 goto out_resource; 3152 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes); 3153 } 3154 if (bmval0 & FATTR4_WORD0_MAXLINK) { 3155 p = xdr_reserve_space(xdr, 4); 3156 if (!p) 3157 goto out_resource; 3158 *p++ = cpu_to_be32(255); 3159 } 3160 if (bmval0 & FATTR4_WORD0_MAXNAME) { 3161 p = xdr_reserve_space(xdr, 4); 3162 if (!p) 3163 goto out_resource; 3164 *p++ = cpu_to_be32(statfs.f_namelen); 3165 } 3166 if (bmval0 & FATTR4_WORD0_MAXREAD) { 3167 p = xdr_reserve_space(xdr, 8); 3168 if (!p) 3169 goto out_resource; 3170 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 3171 } 3172 if (bmval0 & FATTR4_WORD0_MAXWRITE) { 3173 p = xdr_reserve_space(xdr, 8); 3174 if (!p) 3175 goto out_resource; 3176 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 3177 } 3178 if (bmval1 & FATTR4_WORD1_MODE) { 3179 p = xdr_reserve_space(xdr, 4); 3180 if (!p) 3181 goto out_resource; 3182 *p++ = cpu_to_be32(stat.mode & S_IALLUGO); 3183 } 3184 if (bmval1 & FATTR4_WORD1_NO_TRUNC) { 3185 p = xdr_reserve_space(xdr, 4); 3186 if (!p) 3187 goto out_resource; 3188 *p++ = cpu_to_be32(1); 3189 } 3190 if (bmval1 & FATTR4_WORD1_NUMLINKS) { 3191 p = xdr_reserve_space(xdr, 4); 3192 if (!p) 3193 goto out_resource; 3194 *p++ = cpu_to_be32(stat.nlink); 3195 } 3196 if (bmval1 & FATTR4_WORD1_OWNER) { 3197 status = nfsd4_encode_user(xdr, rqstp, stat.uid); 3198 if (status) 3199 goto out; 3200 } 3201 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { 3202 status = nfsd4_encode_group(xdr, rqstp, stat.gid); 3203 if (status) 3204 goto out; 3205 } 3206 if (bmval1 & FATTR4_WORD1_RAWDEV) { 3207 p = xdr_reserve_space(xdr, 8); 3208 if (!p) 3209 goto out_resource; 3210 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev)); 3211 *p++ = cpu_to_be32((u32) MINOR(stat.rdev)); 3212 } 3213 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { 3214 p = xdr_reserve_space(xdr, 8); 3215 if (!p) 3216 goto out_resource; 3217 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; 3218 p = xdr_encode_hyper(p, dummy64); 3219 } 3220 if (bmval1 & FATTR4_WORD1_SPACE_FREE) { 3221 p = xdr_reserve_space(xdr, 8); 3222 if (!p) 3223 goto out_resource; 3224 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; 3225 p = xdr_encode_hyper(p, dummy64); 3226 } 3227 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { 3228 p = xdr_reserve_space(xdr, 8); 3229 if (!p) 3230 goto out_resource; 3231 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; 3232 p = xdr_encode_hyper(p, dummy64); 3233 } 3234 if (bmval1 & FATTR4_WORD1_SPACE_USED) { 3235 p = xdr_reserve_space(xdr, 8); 3236 if (!p) 3237 goto out_resource; 3238 dummy64 = (u64)stat.blocks << 9; 3239 p = xdr_encode_hyper(p, dummy64); 3240 } 3241 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { 3242 p = xdr_reserve_space(xdr, 12); 3243 if (!p) 3244 goto out_resource; 3245 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec); 3246 *p++ = cpu_to_be32(stat.atime.tv_nsec); 3247 } 3248 if (bmval1 & FATTR4_WORD1_TIME_DELTA) { 3249 p = xdr_reserve_space(xdr, 12); 3250 if (!p) 3251 goto out_resource; 3252 p = encode_time_delta(p, d_inode(dentry)); 3253 } 3254 if (bmval1 & FATTR4_WORD1_TIME_METADATA) { 3255 p = xdr_reserve_space(xdr, 12); 3256 if (!p) 3257 goto out_resource; 3258 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec); 3259 *p++ = cpu_to_be32(stat.ctime.tv_nsec); 3260 } 3261 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { 3262 p = xdr_reserve_space(xdr, 12); 3263 if (!p) 3264 goto out_resource; 3265 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec); 3266 *p++ = cpu_to_be32(stat.mtime.tv_nsec); 3267 } 3268 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { 3269 struct kstat parent_stat; 3270 u64 ino = stat.ino; 3271 3272 p = xdr_reserve_space(xdr, 8); 3273 if (!p) 3274 goto out_resource; 3275 /* 3276 * Get parent's attributes if not ignoring crossmount 3277 * and this is the root of a cross-mounted filesystem. 3278 */ 3279 if (ignore_crossmnt == 0 && 3280 dentry == exp->ex_path.mnt->mnt_root) { 3281 err = get_parent_attributes(exp, &parent_stat); 3282 if (err) 3283 goto out_nfserr; 3284 ino = parent_stat.ino; 3285 } 3286 p = xdr_encode_hyper(p, ino); 3287 } 3288 #ifdef CONFIG_NFSD_PNFS 3289 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) { 3290 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 3291 if (status) 3292 goto out; 3293 } 3294 3295 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) { 3296 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 3297 if (status) 3298 goto out; 3299 } 3300 3301 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) { 3302 p = xdr_reserve_space(xdr, 4); 3303 if (!p) 3304 goto out_resource; 3305 *p++ = cpu_to_be32(stat.blksize); 3306 } 3307 #endif /* CONFIG_NFSD_PNFS */ 3308 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) { 3309 u32 supp[3]; 3310 3311 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 3312 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0; 3313 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1; 3314 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2; 3315 3316 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]); 3317 if (status) 3318 goto out; 3319 } 3320 3321 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3322 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 3323 status = nfsd4_encode_security_label(xdr, rqstp, context, 3324 contextlen); 3325 if (status) 3326 goto out; 3327 } 3328 #endif 3329 3330 if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) { 3331 p = xdr_reserve_space(xdr, 4); 3332 if (!p) 3333 goto out_resource; 3334 err = xattr_supported_namespace(d_inode(dentry), 3335 XATTR_USER_PREFIX); 3336 *p++ = cpu_to_be32(err == 0); 3337 } 3338 3339 attrlen = htonl(xdr->buf->len - attrlen_offset - 4); 3340 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4); 3341 status = nfs_ok; 3342 3343 out: 3344 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 3345 if (context) 3346 security_release_secctx(context, contextlen); 3347 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 3348 kfree(acl); 3349 if (tempfh) { 3350 fh_put(tempfh); 3351 kfree(tempfh); 3352 } 3353 if (status) 3354 xdr_truncate_encode(xdr, starting_len); 3355 return status; 3356 out_nfserr: 3357 status = nfserrno(err); 3358 goto out; 3359 out_resource: 3360 status = nfserr_resource; 3361 goto out; 3362 } 3363 3364 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, 3365 struct xdr_buf *buf, __be32 *p, int bytes) 3366 { 3367 xdr->scratch.iov_len = 0; 3368 memset(buf, 0, sizeof(struct xdr_buf)); 3369 buf->head[0].iov_base = p; 3370 buf->head[0].iov_len = 0; 3371 buf->len = 0; 3372 xdr->buf = buf; 3373 xdr->iov = buf->head; 3374 xdr->p = p; 3375 xdr->end = (void *)p + bytes; 3376 buf->buflen = bytes; 3377 } 3378 3379 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, 3380 struct svc_fh *fhp, struct svc_export *exp, 3381 struct dentry *dentry, u32 *bmval, 3382 struct svc_rqst *rqstp, int ignore_crossmnt) 3383 { 3384 struct xdr_buf dummy; 3385 struct xdr_stream xdr; 3386 __be32 ret; 3387 3388 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); 3389 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp, 3390 ignore_crossmnt); 3391 *p = xdr.p; 3392 return ret; 3393 } 3394 3395 static inline int attributes_need_mount(u32 *bmval) 3396 { 3397 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) 3398 return 1; 3399 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) 3400 return 1; 3401 return 0; 3402 } 3403 3404 static __be32 3405 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd, 3406 const char *name, int namlen) 3407 { 3408 struct svc_export *exp = cd->rd_fhp->fh_export; 3409 struct dentry *dentry; 3410 __be32 nfserr; 3411 int ignore_crossmnt = 0; 3412 3413 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen); 3414 if (IS_ERR(dentry)) 3415 return nfserrno(PTR_ERR(dentry)); 3416 3417 exp_get(exp); 3418 /* 3419 * In the case of a mountpoint, the client may be asking for 3420 * attributes that are only properties of the underlying filesystem 3421 * as opposed to the cross-mounted file system. In such a case, 3422 * we will not follow the cross mount and will fill the attribtutes 3423 * directly from the mountpoint dentry. 3424 */ 3425 if (nfsd_mountpoint(dentry, exp)) { 3426 int err; 3427 3428 if (!(exp->ex_flags & NFSEXP_V4ROOT) 3429 && !attributes_need_mount(cd->rd_bmval)) { 3430 ignore_crossmnt = 1; 3431 goto out_encode; 3432 } 3433 /* 3434 * Why the heck aren't we just using nfsd_lookup?? 3435 * Different "."/".." handling? Something else? 3436 * At least, add a comment here to explain.... 3437 */ 3438 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); 3439 if (err) { 3440 nfserr = nfserrno(err); 3441 goto out_put; 3442 } 3443 nfserr = check_nfsd_access(exp, cd->rd_rqstp); 3444 if (nfserr) 3445 goto out_put; 3446 3447 } 3448 out_encode: 3449 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval, 3450 cd->rd_rqstp, ignore_crossmnt); 3451 out_put: 3452 dput(dentry); 3453 exp_put(exp); 3454 return nfserr; 3455 } 3456 3457 static __be32 * 3458 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr) 3459 { 3460 __be32 *p; 3461 3462 p = xdr_reserve_space(xdr, 20); 3463 if (!p) 3464 return NULL; 3465 *p++ = htonl(2); 3466 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ 3467 *p++ = htonl(0); /* bmval1 */ 3468 3469 *p++ = htonl(4); /* attribute length */ 3470 *p++ = nfserr; /* no htonl */ 3471 return p; 3472 } 3473 3474 static int 3475 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen, 3476 loff_t offset, u64 ino, unsigned int d_type) 3477 { 3478 struct readdir_cd *ccd = ccdv; 3479 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 3480 struct xdr_stream *xdr = cd->xdr; 3481 int start_offset = xdr->buf->len; 3482 int cookie_offset; 3483 u32 name_and_cookie; 3484 int entry_bytes; 3485 __be32 nfserr = nfserr_toosmall; 3486 __be64 wire_offset; 3487 __be32 *p; 3488 3489 /* In nfsv4, "." and ".." never make it onto the wire.. */ 3490 if (name && isdotent(name, namlen)) { 3491 cd->common.err = nfs_ok; 3492 return 0; 3493 } 3494 3495 if (cd->cookie_offset) { 3496 wire_offset = cpu_to_be64(offset); 3497 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset, 3498 &wire_offset, 8); 3499 } 3500 3501 p = xdr_reserve_space(xdr, 4); 3502 if (!p) 3503 goto fail; 3504 *p++ = xdr_one; /* mark entry present */ 3505 cookie_offset = xdr->buf->len; 3506 p = xdr_reserve_space(xdr, 3*4 + namlen); 3507 if (!p) 3508 goto fail; 3509 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */ 3510 p = xdr_encode_array(p, name, namlen); /* name length & name */ 3511 3512 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen); 3513 switch (nfserr) { 3514 case nfs_ok: 3515 break; 3516 case nfserr_resource: 3517 nfserr = nfserr_toosmall; 3518 goto fail; 3519 case nfserr_noent: 3520 xdr_truncate_encode(xdr, start_offset); 3521 goto skip_entry; 3522 default: 3523 /* 3524 * If the client requested the RDATTR_ERROR attribute, 3525 * we stuff the error code into this attribute 3526 * and continue. If this attribute was not requested, 3527 * then in accordance with the spec, we fail the 3528 * entire READDIR operation(!) 3529 */ 3530 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 3531 goto fail; 3532 p = nfsd4_encode_rdattr_error(xdr, nfserr); 3533 if (p == NULL) { 3534 nfserr = nfserr_toosmall; 3535 goto fail; 3536 } 3537 } 3538 nfserr = nfserr_toosmall; 3539 entry_bytes = xdr->buf->len - start_offset; 3540 if (entry_bytes > cd->rd_maxcount) 3541 goto fail; 3542 cd->rd_maxcount -= entry_bytes; 3543 /* 3544 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and 3545 * notes that it could be zero. If it is zero, then the server 3546 * should enforce only the rd_maxcount value. 3547 */ 3548 if (cd->rd_dircount) { 3549 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8; 3550 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset) 3551 goto fail; 3552 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie); 3553 if (!cd->rd_dircount) 3554 cd->rd_maxcount = 0; 3555 } 3556 3557 cd->cookie_offset = cookie_offset; 3558 skip_entry: 3559 cd->common.err = nfs_ok; 3560 return 0; 3561 fail: 3562 xdr_truncate_encode(xdr, start_offset); 3563 cd->common.err = nfserr; 3564 return -EINVAL; 3565 } 3566 3567 static __be32 3568 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid) 3569 { 3570 __be32 *p; 3571 3572 p = xdr_reserve_space(xdr, sizeof(stateid_t)); 3573 if (!p) 3574 return nfserr_resource; 3575 *p++ = cpu_to_be32(sid->si_generation); 3576 p = xdr_encode_opaque_fixed(p, &sid->si_opaque, 3577 sizeof(stateid_opaque_t)); 3578 return 0; 3579 } 3580 3581 static __be32 3582 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access) 3583 { 3584 struct xdr_stream *xdr = resp->xdr; 3585 __be32 *p; 3586 3587 p = xdr_reserve_space(xdr, 8); 3588 if (!p) 3589 return nfserr_resource; 3590 *p++ = cpu_to_be32(access->ac_supported); 3591 *p++ = cpu_to_be32(access->ac_resp_access); 3592 return 0; 3593 } 3594 3595 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts) 3596 { 3597 struct xdr_stream *xdr = resp->xdr; 3598 __be32 *p; 3599 3600 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8); 3601 if (!p) 3602 return nfserr_resource; 3603 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data, 3604 NFS4_MAX_SESSIONID_LEN); 3605 *p++ = cpu_to_be32(bcts->dir); 3606 /* Upshifting from TCP to RDMA is not supported */ 3607 *p++ = cpu_to_be32(0); 3608 return 0; 3609 } 3610 3611 static __be32 3612 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close) 3613 { 3614 struct xdr_stream *xdr = resp->xdr; 3615 3616 return nfsd4_encode_stateid(xdr, &close->cl_stateid); 3617 } 3618 3619 3620 static __be32 3621 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit) 3622 { 3623 struct xdr_stream *xdr = resp->xdr; 3624 __be32 *p; 3625 3626 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3627 if (!p) 3628 return nfserr_resource; 3629 p = xdr_encode_opaque_fixed(p, commit->co_verf.data, 3630 NFS4_VERIFIER_SIZE); 3631 return 0; 3632 } 3633 3634 static __be32 3635 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create) 3636 { 3637 struct xdr_stream *xdr = resp->xdr; 3638 __be32 *p; 3639 3640 p = xdr_reserve_space(xdr, 20); 3641 if (!p) 3642 return nfserr_resource; 3643 encode_cinfo(p, &create->cr_cinfo); 3644 return nfsd4_encode_bitmap(xdr, create->cr_bmval[0], 3645 create->cr_bmval[1], create->cr_bmval[2]); 3646 } 3647 3648 static __be32 3649 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr) 3650 { 3651 struct svc_fh *fhp = getattr->ga_fhp; 3652 struct xdr_stream *xdr = resp->xdr; 3653 3654 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry, 3655 getattr->ga_bmval, resp->rqstp, 0); 3656 } 3657 3658 static __be32 3659 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp) 3660 { 3661 struct xdr_stream *xdr = resp->xdr; 3662 struct svc_fh *fhp = *fhpp; 3663 unsigned int len; 3664 __be32 *p; 3665 3666 len = fhp->fh_handle.fh_size; 3667 p = xdr_reserve_space(xdr, len + 4); 3668 if (!p) 3669 return nfserr_resource; 3670 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len); 3671 return 0; 3672 } 3673 3674 /* 3675 * Including all fields other than the name, a LOCK4denied structure requires 3676 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. 3677 */ 3678 static __be32 3679 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld) 3680 { 3681 struct xdr_netobj *conf = &ld->ld_owner; 3682 __be32 *p; 3683 3684 again: 3685 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len)); 3686 if (!p) { 3687 /* 3688 * Don't fail to return the result just because we can't 3689 * return the conflicting open: 3690 */ 3691 if (conf->len) { 3692 kfree(conf->data); 3693 conf->len = 0; 3694 conf->data = NULL; 3695 goto again; 3696 } 3697 return nfserr_resource; 3698 } 3699 p = xdr_encode_hyper(p, ld->ld_start); 3700 p = xdr_encode_hyper(p, ld->ld_length); 3701 *p++ = cpu_to_be32(ld->ld_type); 3702 if (conf->len) { 3703 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8); 3704 p = xdr_encode_opaque(p, conf->data, conf->len); 3705 kfree(conf->data); 3706 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ 3707 p = xdr_encode_hyper(p, (u64)0); /* clientid */ 3708 *p++ = cpu_to_be32(0); /* length of owner name */ 3709 } 3710 return nfserr_denied; 3711 } 3712 3713 static __be32 3714 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock) 3715 { 3716 struct xdr_stream *xdr = resp->xdr; 3717 3718 if (!nfserr) 3719 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid); 3720 else if (nfserr == nfserr_denied) 3721 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied); 3722 3723 return nfserr; 3724 } 3725 3726 static __be32 3727 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt) 3728 { 3729 struct xdr_stream *xdr = resp->xdr; 3730 3731 if (nfserr == nfserr_denied) 3732 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied); 3733 return nfserr; 3734 } 3735 3736 static __be32 3737 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku) 3738 { 3739 struct xdr_stream *xdr = resp->xdr; 3740 3741 return nfsd4_encode_stateid(xdr, &locku->lu_stateid); 3742 } 3743 3744 3745 static __be32 3746 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link) 3747 { 3748 struct xdr_stream *xdr = resp->xdr; 3749 __be32 *p; 3750 3751 p = xdr_reserve_space(xdr, 20); 3752 if (!p) 3753 return nfserr_resource; 3754 p = encode_cinfo(p, &link->li_cinfo); 3755 return 0; 3756 } 3757 3758 3759 static __be32 3760 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open) 3761 { 3762 struct xdr_stream *xdr = resp->xdr; 3763 __be32 *p; 3764 3765 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid); 3766 if (nfserr) 3767 return nfserr; 3768 p = xdr_reserve_space(xdr, 24); 3769 if (!p) 3770 return nfserr_resource; 3771 p = encode_cinfo(p, &open->op_cinfo); 3772 *p++ = cpu_to_be32(open->op_rflags); 3773 3774 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1], 3775 open->op_bmval[2]); 3776 if (nfserr) 3777 return nfserr; 3778 3779 p = xdr_reserve_space(xdr, 4); 3780 if (!p) 3781 return nfserr_resource; 3782 3783 *p++ = cpu_to_be32(open->op_delegate_type); 3784 switch (open->op_delegate_type) { 3785 case NFS4_OPEN_DELEGATE_NONE: 3786 break; 3787 case NFS4_OPEN_DELEGATE_READ: 3788 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3789 if (nfserr) 3790 return nfserr; 3791 p = xdr_reserve_space(xdr, 20); 3792 if (!p) 3793 return nfserr_resource; 3794 *p++ = cpu_to_be32(open->op_recall); 3795 3796 /* 3797 * TODO: ACE's in delegations 3798 */ 3799 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3800 *p++ = cpu_to_be32(0); 3801 *p++ = cpu_to_be32(0); 3802 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3803 break; 3804 case NFS4_OPEN_DELEGATE_WRITE: 3805 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3806 if (nfserr) 3807 return nfserr; 3808 p = xdr_reserve_space(xdr, 32); 3809 if (!p) 3810 return nfserr_resource; 3811 *p++ = cpu_to_be32(0); 3812 3813 /* 3814 * TODO: space_limit's in delegations 3815 */ 3816 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE); 3817 *p++ = cpu_to_be32(~(u32)0); 3818 *p++ = cpu_to_be32(~(u32)0); 3819 3820 /* 3821 * TODO: ACE's in delegations 3822 */ 3823 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3824 *p++ = cpu_to_be32(0); 3825 *p++ = cpu_to_be32(0); 3826 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3827 break; 3828 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */ 3829 switch (open->op_why_no_deleg) { 3830 case WND4_CONTENTION: 3831 case WND4_RESOURCE: 3832 p = xdr_reserve_space(xdr, 8); 3833 if (!p) 3834 return nfserr_resource; 3835 *p++ = cpu_to_be32(open->op_why_no_deleg); 3836 /* deleg signaling not supported yet: */ 3837 *p++ = cpu_to_be32(0); 3838 break; 3839 default: 3840 p = xdr_reserve_space(xdr, 4); 3841 if (!p) 3842 return nfserr_resource; 3843 *p++ = cpu_to_be32(open->op_why_no_deleg); 3844 } 3845 break; 3846 default: 3847 BUG(); 3848 } 3849 /* XXX save filehandle here */ 3850 return 0; 3851 } 3852 3853 static __be32 3854 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc) 3855 { 3856 struct xdr_stream *xdr = resp->xdr; 3857 3858 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid); 3859 } 3860 3861 static __be32 3862 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od) 3863 { 3864 struct xdr_stream *xdr = resp->xdr; 3865 3866 return nfsd4_encode_stateid(xdr, &od->od_stateid); 3867 } 3868 3869 static __be32 nfsd4_encode_splice_read( 3870 struct nfsd4_compoundres *resp, 3871 struct nfsd4_read *read, 3872 struct file *file, unsigned long maxcount) 3873 { 3874 struct xdr_stream *xdr = resp->xdr; 3875 struct xdr_buf *buf = xdr->buf; 3876 int status, space_left; 3877 u32 eof; 3878 __be32 nfserr; 3879 __be32 *p = xdr->p - 2; 3880 3881 /* Make sure there will be room for padding if needed */ 3882 if (xdr->end - xdr->p < 1) 3883 return nfserr_resource; 3884 3885 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp, 3886 file, read->rd_offset, &maxcount, &eof); 3887 read->rd_length = maxcount; 3888 if (nfserr) 3889 goto out_err; 3890 status = svc_encode_result_payload(read->rd_rqstp, 3891 buf->head[0].iov_len, maxcount); 3892 if (status) { 3893 nfserr = nfserrno(status); 3894 goto out_err; 3895 } 3896 3897 *(p++) = htonl(eof); 3898 *(p++) = htonl(maxcount); 3899 3900 buf->page_len = maxcount; 3901 buf->len += maxcount; 3902 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1) 3903 / PAGE_SIZE; 3904 3905 /* Use rest of head for padding and remaining ops: */ 3906 buf->tail[0].iov_base = xdr->p; 3907 buf->tail[0].iov_len = 0; 3908 xdr->iov = buf->tail; 3909 if (maxcount&3) { 3910 int pad = 4 - (maxcount&3); 3911 3912 *(xdr->p++) = 0; 3913 3914 buf->tail[0].iov_base += maxcount&3; 3915 buf->tail[0].iov_len = pad; 3916 buf->len += pad; 3917 } 3918 3919 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p, 3920 buf->buflen - buf->len); 3921 buf->buflen = buf->len + space_left; 3922 xdr->end = (__be32 *)((void *)xdr->end + space_left); 3923 3924 return 0; 3925 3926 out_err: 3927 /* 3928 * nfsd_splice_actor may have already messed with the 3929 * page length; reset it so as not to confuse 3930 * xdr_truncate_encode in our caller. 3931 */ 3932 buf->page_len = 0; 3933 return nfserr; 3934 } 3935 3936 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, 3937 struct nfsd4_read *read, 3938 struct file *file, unsigned long maxcount) 3939 { 3940 struct xdr_stream *xdr = resp->xdr; 3941 u32 eof; 3942 int starting_len = xdr->buf->len - 8; 3943 __be32 nfserr; 3944 __be32 tmp; 3945 int pad; 3946 3947 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount); 3948 if (read->rd_vlen < 0) 3949 return nfserr_resource; 3950 3951 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset, 3952 resp->rqstp->rq_vec, read->rd_vlen, &maxcount, 3953 &eof); 3954 read->rd_length = maxcount; 3955 if (nfserr) 3956 return nfserr; 3957 if (svc_encode_result_payload(resp->rqstp, starting_len + 8, maxcount)) 3958 return nfserr_io; 3959 xdr_truncate_encode(xdr, starting_len + 8 + xdr_align_size(maxcount)); 3960 3961 tmp = htonl(eof); 3962 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4); 3963 tmp = htonl(maxcount); 3964 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4); 3965 3966 tmp = xdr_zero; 3967 pad = (maxcount&3) ? 4 - (maxcount&3) : 0; 3968 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount, 3969 &tmp, pad); 3970 return 0; 3971 3972 } 3973 3974 static __be32 3975 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 3976 struct nfsd4_read *read) 3977 { 3978 unsigned long maxcount; 3979 struct xdr_stream *xdr = resp->xdr; 3980 struct file *file; 3981 int starting_len = xdr->buf->len; 3982 __be32 *p; 3983 3984 if (nfserr) 3985 return nfserr; 3986 file = read->rd_nf->nf_file; 3987 3988 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ 3989 if (!p) { 3990 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)); 3991 return nfserr_resource; 3992 } 3993 if (resp->xdr->buf->page_len && 3994 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) { 3995 WARN_ON_ONCE(1); 3996 return nfserr_resource; 3997 } 3998 xdr_commit_encode(xdr); 3999 4000 maxcount = svc_max_payload(resp->rqstp); 4001 maxcount = min_t(unsigned long, maxcount, 4002 (xdr->buf->buflen - xdr->buf->len)); 4003 maxcount = min_t(unsigned long, maxcount, read->rd_length); 4004 4005 if (file->f_op->splice_read && 4006 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) 4007 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 4008 else 4009 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 4010 4011 if (nfserr) 4012 xdr_truncate_encode(xdr, starting_len); 4013 4014 return nfserr; 4015 } 4016 4017 static __be32 4018 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink) 4019 { 4020 int maxcount; 4021 __be32 wire_count; 4022 int zero = 0; 4023 struct xdr_stream *xdr = resp->xdr; 4024 int length_offset = xdr->buf->len; 4025 int status; 4026 __be32 *p; 4027 4028 p = xdr_reserve_space(xdr, 4); 4029 if (!p) 4030 return nfserr_resource; 4031 maxcount = PAGE_SIZE; 4032 4033 p = xdr_reserve_space(xdr, maxcount); 4034 if (!p) 4035 return nfserr_resource; 4036 /* 4037 * XXX: By default, vfs_readlink() will truncate symlinks if they 4038 * would overflow the buffer. Is this kosher in NFSv4? If not, one 4039 * easy fix is: if vfs_readlink() precisely fills the buffer, assume 4040 * that truncation occurred, and return NFS4ERR_RESOURCE. 4041 */ 4042 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, 4043 (char *)p, &maxcount); 4044 if (nfserr == nfserr_isdir) 4045 nfserr = nfserr_inval; 4046 if (nfserr) 4047 goto out_err; 4048 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset, 4049 maxcount); 4050 if (status) { 4051 nfserr = nfserrno(status); 4052 goto out_err; 4053 } 4054 4055 wire_count = htonl(maxcount); 4056 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4); 4057 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4)); 4058 if (maxcount & 3) 4059 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, 4060 &zero, 4 - (maxcount&3)); 4061 return 0; 4062 4063 out_err: 4064 xdr_truncate_encode(xdr, length_offset); 4065 return nfserr; 4066 } 4067 4068 static __be32 4069 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir) 4070 { 4071 int maxcount; 4072 int bytes_left; 4073 loff_t offset; 4074 __be64 wire_offset; 4075 struct xdr_stream *xdr = resp->xdr; 4076 int starting_len = xdr->buf->len; 4077 __be32 *p; 4078 4079 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 4080 if (!p) 4081 return nfserr_resource; 4082 4083 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ 4084 *p++ = cpu_to_be32(0); 4085 *p++ = cpu_to_be32(0); 4086 xdr->buf->head[0].iov_len = (char *)xdr->p - 4087 (char *)xdr->buf->head[0].iov_base; 4088 4089 /* 4090 * Number of bytes left for directory entries allowing for the 4091 * final 8 bytes of the readdir and a following failed op: 4092 */ 4093 bytes_left = xdr->buf->buflen - xdr->buf->len 4094 - COMPOUND_ERR_SLACK_SPACE - 8; 4095 if (bytes_left < 0) { 4096 nfserr = nfserr_resource; 4097 goto err_no_verf; 4098 } 4099 maxcount = svc_max_payload(resp->rqstp); 4100 maxcount = min_t(u32, readdir->rd_maxcount, maxcount); 4101 /* 4102 * Note the rfc defines rd_maxcount as the size of the 4103 * READDIR4resok structure, which includes the verifier above 4104 * and the 8 bytes encoded at the end of this function: 4105 */ 4106 if (maxcount < 16) { 4107 nfserr = nfserr_toosmall; 4108 goto err_no_verf; 4109 } 4110 maxcount = min_t(int, maxcount-16, bytes_left); 4111 4112 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */ 4113 if (!readdir->rd_dircount) 4114 readdir->rd_dircount = svc_max_payload(resp->rqstp); 4115 4116 readdir->xdr = xdr; 4117 readdir->rd_maxcount = maxcount; 4118 readdir->common.err = 0; 4119 readdir->cookie_offset = 0; 4120 4121 offset = readdir->rd_cookie; 4122 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, 4123 &offset, 4124 &readdir->common, nfsd4_encode_dirent); 4125 if (nfserr == nfs_ok && 4126 readdir->common.err == nfserr_toosmall && 4127 xdr->buf->len == starting_len + 8) { 4128 /* nothing encoded; which limit did we hit?: */ 4129 if (maxcount - 16 < bytes_left) 4130 /* It was the fault of rd_maxcount: */ 4131 nfserr = nfserr_toosmall; 4132 else 4133 /* We ran out of buffer space: */ 4134 nfserr = nfserr_resource; 4135 } 4136 if (nfserr) 4137 goto err_no_verf; 4138 4139 if (readdir->cookie_offset) { 4140 wire_offset = cpu_to_be64(offset); 4141 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, 4142 &wire_offset, 8); 4143 } 4144 4145 p = xdr_reserve_space(xdr, 8); 4146 if (!p) { 4147 WARN_ON_ONCE(1); 4148 goto err_no_verf; 4149 } 4150 *p++ = 0; /* no more entries */ 4151 *p++ = htonl(readdir->common.err == nfserr_eof); 4152 4153 return 0; 4154 err_no_verf: 4155 xdr_truncate_encode(xdr, starting_len); 4156 return nfserr; 4157 } 4158 4159 static __be32 4160 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove) 4161 { 4162 struct xdr_stream *xdr = resp->xdr; 4163 __be32 *p; 4164 4165 p = xdr_reserve_space(xdr, 20); 4166 if (!p) 4167 return nfserr_resource; 4168 p = encode_cinfo(p, &remove->rm_cinfo); 4169 return 0; 4170 } 4171 4172 static __be32 4173 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename) 4174 { 4175 struct xdr_stream *xdr = resp->xdr; 4176 __be32 *p; 4177 4178 p = xdr_reserve_space(xdr, 40); 4179 if (!p) 4180 return nfserr_resource; 4181 p = encode_cinfo(p, &rename->rn_sinfo); 4182 p = encode_cinfo(p, &rename->rn_tinfo); 4183 return 0; 4184 } 4185 4186 static __be32 4187 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp) 4188 { 4189 u32 i, nflavs, supported; 4190 struct exp_flavor_info *flavs; 4191 struct exp_flavor_info def_flavs[2]; 4192 __be32 *p, *flavorsp; 4193 static bool report = true; 4194 4195 if (exp->ex_nflavors) { 4196 flavs = exp->ex_flavors; 4197 nflavs = exp->ex_nflavors; 4198 } else { /* Handling of some defaults in absence of real secinfo: */ 4199 flavs = def_flavs; 4200 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { 4201 nflavs = 2; 4202 flavs[0].pseudoflavor = RPC_AUTH_UNIX; 4203 flavs[1].pseudoflavor = RPC_AUTH_NULL; 4204 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { 4205 nflavs = 1; 4206 flavs[0].pseudoflavor 4207 = svcauth_gss_flavor(exp->ex_client); 4208 } else { 4209 nflavs = 1; 4210 flavs[0].pseudoflavor 4211 = exp->ex_client->flavour->flavour; 4212 } 4213 } 4214 4215 supported = 0; 4216 p = xdr_reserve_space(xdr, 4); 4217 if (!p) 4218 return nfserr_resource; 4219 flavorsp = p++; /* to be backfilled later */ 4220 4221 for (i = 0; i < nflavs; i++) { 4222 rpc_authflavor_t pf = flavs[i].pseudoflavor; 4223 struct rpcsec_gss_info info; 4224 4225 if (rpcauth_get_gssinfo(pf, &info) == 0) { 4226 supported++; 4227 p = xdr_reserve_space(xdr, 4 + 4 + 4228 XDR_LEN(info.oid.len) + 4 + 4); 4229 if (!p) 4230 return nfserr_resource; 4231 *p++ = cpu_to_be32(RPC_AUTH_GSS); 4232 p = xdr_encode_opaque(p, info.oid.data, info.oid.len); 4233 *p++ = cpu_to_be32(info.qop); 4234 *p++ = cpu_to_be32(info.service); 4235 } else if (pf < RPC_AUTH_MAXFLAVOR) { 4236 supported++; 4237 p = xdr_reserve_space(xdr, 4); 4238 if (!p) 4239 return nfserr_resource; 4240 *p++ = cpu_to_be32(pf); 4241 } else { 4242 if (report) 4243 pr_warn("NFS: SECINFO: security flavor %u " 4244 "is not supported\n", pf); 4245 } 4246 } 4247 4248 if (nflavs != supported) 4249 report = false; 4250 *flavorsp = htonl(supported); 4251 return 0; 4252 } 4253 4254 static __be32 4255 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4256 struct nfsd4_secinfo *secinfo) 4257 { 4258 struct xdr_stream *xdr = resp->xdr; 4259 4260 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp); 4261 } 4262 4263 static __be32 4264 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, 4265 struct nfsd4_secinfo_no_name *secinfo) 4266 { 4267 struct xdr_stream *xdr = resp->xdr; 4268 4269 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp); 4270 } 4271 4272 /* 4273 * The SETATTR encode routine is special -- it always encodes a bitmap, 4274 * regardless of the error status. 4275 */ 4276 static __be32 4277 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr) 4278 { 4279 struct xdr_stream *xdr = resp->xdr; 4280 __be32 *p; 4281 4282 p = xdr_reserve_space(xdr, 16); 4283 if (!p) 4284 return nfserr_resource; 4285 if (nfserr) { 4286 *p++ = cpu_to_be32(3); 4287 *p++ = cpu_to_be32(0); 4288 *p++ = cpu_to_be32(0); 4289 *p++ = cpu_to_be32(0); 4290 } 4291 else { 4292 *p++ = cpu_to_be32(3); 4293 *p++ = cpu_to_be32(setattr->sa_bmval[0]); 4294 *p++ = cpu_to_be32(setattr->sa_bmval[1]); 4295 *p++ = cpu_to_be32(setattr->sa_bmval[2]); 4296 } 4297 return nfserr; 4298 } 4299 4300 static __be32 4301 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd) 4302 { 4303 struct xdr_stream *xdr = resp->xdr; 4304 __be32 *p; 4305 4306 if (!nfserr) { 4307 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE); 4308 if (!p) 4309 return nfserr_resource; 4310 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8); 4311 p = xdr_encode_opaque_fixed(p, &scd->se_confirm, 4312 NFS4_VERIFIER_SIZE); 4313 } 4314 else if (nfserr == nfserr_clid_inuse) { 4315 p = xdr_reserve_space(xdr, 8); 4316 if (!p) 4317 return nfserr_resource; 4318 *p++ = cpu_to_be32(0); 4319 *p++ = cpu_to_be32(0); 4320 } 4321 return nfserr; 4322 } 4323 4324 static __be32 4325 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write) 4326 { 4327 struct xdr_stream *xdr = resp->xdr; 4328 __be32 *p; 4329 4330 p = xdr_reserve_space(xdr, 16); 4331 if (!p) 4332 return nfserr_resource; 4333 *p++ = cpu_to_be32(write->wr_bytes_written); 4334 *p++ = cpu_to_be32(write->wr_how_written); 4335 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4336 NFS4_VERIFIER_SIZE); 4337 return 0; 4338 } 4339 4340 static __be32 4341 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, 4342 struct nfsd4_exchange_id *exid) 4343 { 4344 struct xdr_stream *xdr = resp->xdr; 4345 __be32 *p; 4346 char *major_id; 4347 char *server_scope; 4348 int major_id_sz; 4349 int server_scope_sz; 4350 uint64_t minor_id = 0; 4351 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id); 4352 4353 major_id = nn->nfsd_name; 4354 major_id_sz = strlen(nn->nfsd_name); 4355 server_scope = nn->nfsd_name; 4356 server_scope_sz = strlen(nn->nfsd_name); 4357 4358 p = xdr_reserve_space(xdr, 4359 8 /* eir_clientid */ + 4360 4 /* eir_sequenceid */ + 4361 4 /* eir_flags */ + 4362 4 /* spr_how */); 4363 if (!p) 4364 return nfserr_resource; 4365 4366 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8); 4367 *p++ = cpu_to_be32(exid->seqid); 4368 *p++ = cpu_to_be32(exid->flags); 4369 4370 *p++ = cpu_to_be32(exid->spa_how); 4371 4372 switch (exid->spa_how) { 4373 case SP4_NONE: 4374 break; 4375 case SP4_MACH_CRED: 4376 /* spo_must_enforce bitmap: */ 4377 nfserr = nfsd4_encode_bitmap(xdr, 4378 exid->spo_must_enforce[0], 4379 exid->spo_must_enforce[1], 4380 exid->spo_must_enforce[2]); 4381 if (nfserr) 4382 return nfserr; 4383 /* spo_must_allow bitmap: */ 4384 nfserr = nfsd4_encode_bitmap(xdr, 4385 exid->spo_must_allow[0], 4386 exid->spo_must_allow[1], 4387 exid->spo_must_allow[2]); 4388 if (nfserr) 4389 return nfserr; 4390 break; 4391 default: 4392 WARN_ON_ONCE(1); 4393 } 4394 4395 p = xdr_reserve_space(xdr, 4396 8 /* so_minor_id */ + 4397 4 /* so_major_id.len */ + 4398 (XDR_QUADLEN(major_id_sz) * 4) + 4399 4 /* eir_server_scope.len */ + 4400 (XDR_QUADLEN(server_scope_sz) * 4) + 4401 4 /* eir_server_impl_id.count (0) */); 4402 if (!p) 4403 return nfserr_resource; 4404 4405 /* The server_owner struct */ 4406 p = xdr_encode_hyper(p, minor_id); /* Minor id */ 4407 /* major id */ 4408 p = xdr_encode_opaque(p, major_id, major_id_sz); 4409 4410 /* Server scope */ 4411 p = xdr_encode_opaque(p, server_scope, server_scope_sz); 4412 4413 /* Implementation id */ 4414 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */ 4415 return 0; 4416 } 4417 4418 static __be32 4419 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, 4420 struct nfsd4_create_session *sess) 4421 { 4422 struct xdr_stream *xdr = resp->xdr; 4423 __be32 *p; 4424 4425 p = xdr_reserve_space(xdr, 24); 4426 if (!p) 4427 return nfserr_resource; 4428 p = xdr_encode_opaque_fixed(p, sess->sessionid.data, 4429 NFS4_MAX_SESSIONID_LEN); 4430 *p++ = cpu_to_be32(sess->seqid); 4431 *p++ = cpu_to_be32(sess->flags); 4432 4433 p = xdr_reserve_space(xdr, 28); 4434 if (!p) 4435 return nfserr_resource; 4436 *p++ = cpu_to_be32(0); /* headerpadsz */ 4437 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz); 4438 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz); 4439 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached); 4440 *p++ = cpu_to_be32(sess->fore_channel.maxops); 4441 *p++ = cpu_to_be32(sess->fore_channel.maxreqs); 4442 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs); 4443 4444 if (sess->fore_channel.nr_rdma_attrs) { 4445 p = xdr_reserve_space(xdr, 4); 4446 if (!p) 4447 return nfserr_resource; 4448 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs); 4449 } 4450 4451 p = xdr_reserve_space(xdr, 28); 4452 if (!p) 4453 return nfserr_resource; 4454 *p++ = cpu_to_be32(0); /* headerpadsz */ 4455 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz); 4456 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz); 4457 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached); 4458 *p++ = cpu_to_be32(sess->back_channel.maxops); 4459 *p++ = cpu_to_be32(sess->back_channel.maxreqs); 4460 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs); 4461 4462 if (sess->back_channel.nr_rdma_attrs) { 4463 p = xdr_reserve_space(xdr, 4); 4464 if (!p) 4465 return nfserr_resource; 4466 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs); 4467 } 4468 return 0; 4469 } 4470 4471 static __be32 4472 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, 4473 struct nfsd4_sequence *seq) 4474 { 4475 struct xdr_stream *xdr = resp->xdr; 4476 __be32 *p; 4477 4478 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20); 4479 if (!p) 4480 return nfserr_resource; 4481 p = xdr_encode_opaque_fixed(p, seq->sessionid.data, 4482 NFS4_MAX_SESSIONID_LEN); 4483 *p++ = cpu_to_be32(seq->seqid); 4484 *p++ = cpu_to_be32(seq->slotid); 4485 /* Note slotid's are numbered from zero: */ 4486 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */ 4487 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */ 4488 *p++ = cpu_to_be32(seq->status_flags); 4489 4490 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */ 4491 return 0; 4492 } 4493 4494 static __be32 4495 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, 4496 struct nfsd4_test_stateid *test_stateid) 4497 { 4498 struct xdr_stream *xdr = resp->xdr; 4499 struct nfsd4_test_stateid_id *stateid, *next; 4500 __be32 *p; 4501 4502 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids)); 4503 if (!p) 4504 return nfserr_resource; 4505 *p++ = htonl(test_stateid->ts_num_ids); 4506 4507 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) { 4508 *p++ = stateid->ts_id_status; 4509 } 4510 4511 return 0; 4512 } 4513 4514 #ifdef CONFIG_NFSD_PNFS 4515 static __be32 4516 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4517 struct nfsd4_getdeviceinfo *gdev) 4518 { 4519 struct xdr_stream *xdr = resp->xdr; 4520 const struct nfsd4_layout_ops *ops; 4521 u32 starting_len = xdr->buf->len, needed_len; 4522 __be32 *p; 4523 4524 p = xdr_reserve_space(xdr, 4); 4525 if (!p) 4526 return nfserr_resource; 4527 4528 *p++ = cpu_to_be32(gdev->gd_layout_type); 4529 4530 /* If maxcount is 0 then just update notifications */ 4531 if (gdev->gd_maxcount != 0) { 4532 ops = nfsd4_layout_ops[gdev->gd_layout_type]; 4533 nfserr = ops->encode_getdeviceinfo(xdr, gdev); 4534 if (nfserr) { 4535 /* 4536 * We don't bother to burden the layout drivers with 4537 * enforcing gd_maxcount, just tell the client to 4538 * come back with a bigger buffer if it's not enough. 4539 */ 4540 if (xdr->buf->len + 4 > gdev->gd_maxcount) 4541 goto toosmall; 4542 return nfserr; 4543 } 4544 } 4545 4546 if (gdev->gd_notify_types) { 4547 p = xdr_reserve_space(xdr, 4 + 4); 4548 if (!p) 4549 return nfserr_resource; 4550 *p++ = cpu_to_be32(1); /* bitmap length */ 4551 *p++ = cpu_to_be32(gdev->gd_notify_types); 4552 } else { 4553 p = xdr_reserve_space(xdr, 4); 4554 if (!p) 4555 return nfserr_resource; 4556 *p++ = 0; 4557 } 4558 4559 return 0; 4560 toosmall: 4561 dprintk("%s: maxcount too small\n", __func__); 4562 needed_len = xdr->buf->len + 4 /* notifications */; 4563 xdr_truncate_encode(xdr, starting_len); 4564 p = xdr_reserve_space(xdr, 4); 4565 if (!p) 4566 return nfserr_resource; 4567 *p++ = cpu_to_be32(needed_len); 4568 return nfserr_toosmall; 4569 } 4570 4571 static __be32 4572 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, 4573 struct nfsd4_layoutget *lgp) 4574 { 4575 struct xdr_stream *xdr = resp->xdr; 4576 const struct nfsd4_layout_ops *ops; 4577 __be32 *p; 4578 4579 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t)); 4580 if (!p) 4581 return nfserr_resource; 4582 4583 *p++ = cpu_to_be32(1); /* we always set return-on-close */ 4584 *p++ = cpu_to_be32(lgp->lg_sid.si_generation); 4585 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque, 4586 sizeof(stateid_opaque_t)); 4587 4588 *p++ = cpu_to_be32(1); /* we always return a single layout */ 4589 p = xdr_encode_hyper(p, lgp->lg_seg.offset); 4590 p = xdr_encode_hyper(p, lgp->lg_seg.length); 4591 *p++ = cpu_to_be32(lgp->lg_seg.iomode); 4592 *p++ = cpu_to_be32(lgp->lg_layout_type); 4593 4594 ops = nfsd4_layout_ops[lgp->lg_layout_type]; 4595 return ops->encode_layoutget(xdr, lgp); 4596 } 4597 4598 static __be32 4599 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, 4600 struct nfsd4_layoutcommit *lcp) 4601 { 4602 struct xdr_stream *xdr = resp->xdr; 4603 __be32 *p; 4604 4605 p = xdr_reserve_space(xdr, 4); 4606 if (!p) 4607 return nfserr_resource; 4608 *p++ = cpu_to_be32(lcp->lc_size_chg); 4609 if (lcp->lc_size_chg) { 4610 p = xdr_reserve_space(xdr, 8); 4611 if (!p) 4612 return nfserr_resource; 4613 p = xdr_encode_hyper(p, lcp->lc_newsize); 4614 } 4615 4616 return 0; 4617 } 4618 4619 static __be32 4620 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr, 4621 struct nfsd4_layoutreturn *lrp) 4622 { 4623 struct xdr_stream *xdr = resp->xdr; 4624 __be32 *p; 4625 4626 p = xdr_reserve_space(xdr, 4); 4627 if (!p) 4628 return nfserr_resource; 4629 *p++ = cpu_to_be32(lrp->lrs_present); 4630 if (lrp->lrs_present) 4631 return nfsd4_encode_stateid(xdr, &lrp->lr_sid); 4632 return 0; 4633 } 4634 #endif /* CONFIG_NFSD_PNFS */ 4635 4636 static __be32 4637 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, 4638 struct nfsd42_write_res *write, bool sync) 4639 { 4640 __be32 *p; 4641 p = xdr_reserve_space(resp->xdr, 4); 4642 if (!p) 4643 return nfserr_resource; 4644 4645 if (sync) 4646 *p++ = cpu_to_be32(0); 4647 else { 4648 __be32 nfserr; 4649 *p++ = cpu_to_be32(1); 4650 nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid); 4651 if (nfserr) 4652 return nfserr; 4653 } 4654 p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE); 4655 if (!p) 4656 return nfserr_resource; 4657 4658 p = xdr_encode_hyper(p, write->wr_bytes_written); 4659 *p++ = cpu_to_be32(write->wr_stable_how); 4660 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4661 NFS4_VERIFIER_SIZE); 4662 return nfs_ok; 4663 } 4664 4665 static __be32 4666 nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns) 4667 { 4668 struct xdr_stream *xdr = resp->xdr; 4669 struct nfs42_netaddr *addr; 4670 __be32 *p; 4671 4672 p = xdr_reserve_space(xdr, 4); 4673 *p++ = cpu_to_be32(ns->nl4_type); 4674 4675 switch (ns->nl4_type) { 4676 case NL4_NETADDR: 4677 addr = &ns->u.nl4_addr; 4678 4679 /* netid_len, netid, uaddr_len, uaddr (port included 4680 * in RPCBIND_MAXUADDRLEN) 4681 */ 4682 p = xdr_reserve_space(xdr, 4683 4 /* netid len */ + 4684 (XDR_QUADLEN(addr->netid_len) * 4) + 4685 4 /* uaddr len */ + 4686 (XDR_QUADLEN(addr->addr_len) * 4)); 4687 if (!p) 4688 return nfserr_resource; 4689 4690 *p++ = cpu_to_be32(addr->netid_len); 4691 p = xdr_encode_opaque_fixed(p, addr->netid, 4692 addr->netid_len); 4693 *p++ = cpu_to_be32(addr->addr_len); 4694 p = xdr_encode_opaque_fixed(p, addr->addr, 4695 addr->addr_len); 4696 break; 4697 default: 4698 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR); 4699 return nfserr_inval; 4700 } 4701 4702 return 0; 4703 } 4704 4705 static __be32 4706 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr, 4707 struct nfsd4_copy *copy) 4708 { 4709 __be32 *p; 4710 4711 nfserr = nfsd42_encode_write_res(resp, ©->cp_res, 4712 !!copy->cp_synchronous); 4713 if (nfserr) 4714 return nfserr; 4715 4716 p = xdr_reserve_space(resp->xdr, 4 + 4); 4717 *p++ = xdr_one; /* cr_consecutive */ 4718 *p++ = cpu_to_be32(copy->cp_synchronous); 4719 return 0; 4720 } 4721 4722 static __be32 4723 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr, 4724 struct nfsd4_offload_status *os) 4725 { 4726 struct xdr_stream *xdr = resp->xdr; 4727 __be32 *p; 4728 4729 p = xdr_reserve_space(xdr, 8 + 4); 4730 if (!p) 4731 return nfserr_resource; 4732 p = xdr_encode_hyper(p, os->count); 4733 *p++ = cpu_to_be32(0); 4734 return nfserr; 4735 } 4736 4737 static __be32 4738 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp, 4739 struct nfsd4_read *read, 4740 unsigned long *maxcount, u32 *eof, 4741 loff_t *pos) 4742 { 4743 struct xdr_stream *xdr = resp->xdr; 4744 struct file *file = read->rd_nf->nf_file; 4745 int starting_len = xdr->buf->len; 4746 loff_t hole_pos; 4747 __be32 nfserr; 4748 __be32 *p, tmp; 4749 __be64 tmp64; 4750 4751 hole_pos = pos ? *pos : vfs_llseek(file, read->rd_offset, SEEK_HOLE); 4752 if (hole_pos > read->rd_offset) 4753 *maxcount = min_t(unsigned long, *maxcount, hole_pos - read->rd_offset); 4754 *maxcount = min_t(unsigned long, *maxcount, (xdr->buf->buflen - xdr->buf->len)); 4755 4756 /* Content type, offset, byte count */ 4757 p = xdr_reserve_space(xdr, 4 + 8 + 4); 4758 if (!p) 4759 return nfserr_resource; 4760 4761 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, *maxcount); 4762 if (read->rd_vlen < 0) 4763 return nfserr_resource; 4764 4765 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset, 4766 resp->rqstp->rq_vec, read->rd_vlen, maxcount, eof); 4767 if (nfserr) 4768 return nfserr; 4769 xdr_truncate_encode(xdr, starting_len + 16 + xdr_align_size(*maxcount)); 4770 4771 tmp = htonl(NFS4_CONTENT_DATA); 4772 write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4); 4773 tmp64 = cpu_to_be64(read->rd_offset); 4774 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp64, 8); 4775 tmp = htonl(*maxcount); 4776 write_bytes_to_xdr_buf(xdr->buf, starting_len + 12, &tmp, 4); 4777 4778 tmp = xdr_zero; 4779 write_bytes_to_xdr_buf(xdr->buf, starting_len + 16 + *maxcount, &tmp, 4780 xdr_pad_size(*maxcount)); 4781 return nfs_ok; 4782 } 4783 4784 static __be32 4785 nfsd4_encode_read_plus_hole(struct nfsd4_compoundres *resp, 4786 struct nfsd4_read *read, 4787 unsigned long *maxcount, u32 *eof) 4788 { 4789 struct file *file = read->rd_nf->nf_file; 4790 loff_t data_pos = vfs_llseek(file, read->rd_offset, SEEK_DATA); 4791 loff_t f_size = i_size_read(file_inode(file)); 4792 unsigned long count; 4793 __be32 *p; 4794 4795 if (data_pos == -ENXIO) 4796 data_pos = f_size; 4797 else if (data_pos <= read->rd_offset || (data_pos < f_size && data_pos % PAGE_SIZE)) 4798 return nfsd4_encode_read_plus_data(resp, read, maxcount, eof, &f_size); 4799 count = data_pos - read->rd_offset; 4800 4801 /* Content type, offset, byte count */ 4802 p = xdr_reserve_space(resp->xdr, 4 + 8 + 8); 4803 if (!p) 4804 return nfserr_resource; 4805 4806 *p++ = htonl(NFS4_CONTENT_HOLE); 4807 p = xdr_encode_hyper(p, read->rd_offset); 4808 p = xdr_encode_hyper(p, count); 4809 4810 *eof = (read->rd_offset + count) >= f_size; 4811 *maxcount = min_t(unsigned long, count, *maxcount); 4812 return nfs_ok; 4813 } 4814 4815 static __be32 4816 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr, 4817 struct nfsd4_read *read) 4818 { 4819 unsigned long maxcount, count; 4820 struct xdr_stream *xdr = resp->xdr; 4821 struct file *file; 4822 int starting_len = xdr->buf->len; 4823 int last_segment = xdr->buf->len; 4824 int segments = 0; 4825 __be32 *p, tmp; 4826 bool is_data; 4827 loff_t pos; 4828 u32 eof; 4829 4830 if (nfserr) 4831 return nfserr; 4832 file = read->rd_nf->nf_file; 4833 4834 /* eof flag, segment count */ 4835 p = xdr_reserve_space(xdr, 4 + 4); 4836 if (!p) 4837 return nfserr_resource; 4838 xdr_commit_encode(xdr); 4839 4840 maxcount = svc_max_payload(resp->rqstp); 4841 maxcount = min_t(unsigned long, maxcount, 4842 (xdr->buf->buflen - xdr->buf->len)); 4843 maxcount = min_t(unsigned long, maxcount, read->rd_length); 4844 count = maxcount; 4845 4846 eof = read->rd_offset >= i_size_read(file_inode(file)); 4847 if (eof) 4848 goto out; 4849 4850 pos = vfs_llseek(file, read->rd_offset, SEEK_HOLE); 4851 is_data = pos > read->rd_offset; 4852 4853 while (count > 0 && !eof) { 4854 maxcount = count; 4855 if (is_data) 4856 nfserr = nfsd4_encode_read_plus_data(resp, read, &maxcount, &eof, 4857 segments == 0 ? &pos : NULL); 4858 else 4859 nfserr = nfsd4_encode_read_plus_hole(resp, read, &maxcount, &eof); 4860 if (nfserr) 4861 goto out; 4862 count -= maxcount; 4863 read->rd_offset += maxcount; 4864 is_data = !is_data; 4865 last_segment = xdr->buf->len; 4866 segments++; 4867 } 4868 4869 out: 4870 if (nfserr && segments == 0) 4871 xdr_truncate_encode(xdr, starting_len); 4872 else { 4873 if (nfserr) { 4874 xdr_truncate_encode(xdr, last_segment); 4875 nfserr = nfs_ok; 4876 eof = 0; 4877 } 4878 tmp = htonl(eof); 4879 write_bytes_to_xdr_buf(xdr->buf, starting_len, &tmp, 4); 4880 tmp = htonl(segments); 4881 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4); 4882 } 4883 4884 return nfserr; 4885 } 4886 4887 static __be32 4888 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr, 4889 struct nfsd4_copy_notify *cn) 4890 { 4891 struct xdr_stream *xdr = resp->xdr; 4892 __be32 *p; 4893 4894 if (nfserr) 4895 return nfserr; 4896 4897 /* 8 sec, 4 nsec */ 4898 p = xdr_reserve_space(xdr, 12); 4899 if (!p) 4900 return nfserr_resource; 4901 4902 /* cnr_lease_time */ 4903 p = xdr_encode_hyper(p, cn->cpn_sec); 4904 *p++ = cpu_to_be32(cn->cpn_nsec); 4905 4906 /* cnr_stateid */ 4907 nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid); 4908 if (nfserr) 4909 return nfserr; 4910 4911 /* cnr_src.nl_nsvr */ 4912 p = xdr_reserve_space(xdr, 4); 4913 if (!p) 4914 return nfserr_resource; 4915 4916 *p++ = cpu_to_be32(1); 4917 4918 return nfsd42_encode_nl4_server(resp, &cn->cpn_src); 4919 } 4920 4921 static __be32 4922 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, 4923 struct nfsd4_seek *seek) 4924 { 4925 __be32 *p; 4926 4927 p = xdr_reserve_space(resp->xdr, 4 + 8); 4928 *p++ = cpu_to_be32(seek->seek_eof); 4929 p = xdr_encode_hyper(p, seek->seek_pos); 4930 4931 return 0; 4932 } 4933 4934 static __be32 4935 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p) 4936 { 4937 return nfserr; 4938 } 4939 4940 /* 4941 * Encode kmalloc-ed buffer in to XDR stream. 4942 */ 4943 static __be32 4944 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen) 4945 { 4946 u32 cplen; 4947 __be32 *p; 4948 4949 cplen = min_t(unsigned long, buflen, 4950 ((void *)xdr->end - (void *)xdr->p)); 4951 p = xdr_reserve_space(xdr, cplen); 4952 if (!p) 4953 return nfserr_resource; 4954 4955 memcpy(p, buf, cplen); 4956 buf += cplen; 4957 buflen -= cplen; 4958 4959 while (buflen) { 4960 cplen = min_t(u32, buflen, PAGE_SIZE); 4961 p = xdr_reserve_space(xdr, cplen); 4962 if (!p) 4963 return nfserr_resource; 4964 4965 memcpy(p, buf, cplen); 4966 4967 if (cplen < PAGE_SIZE) { 4968 /* 4969 * We're done, with a length that wasn't page 4970 * aligned, so possibly not word aligned. Pad 4971 * any trailing bytes with 0. 4972 */ 4973 xdr_encode_opaque_fixed(p, NULL, cplen); 4974 break; 4975 } 4976 4977 buflen -= PAGE_SIZE; 4978 buf += PAGE_SIZE; 4979 } 4980 4981 return 0; 4982 } 4983 4984 static __be32 4985 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 4986 struct nfsd4_getxattr *getxattr) 4987 { 4988 struct xdr_stream *xdr = resp->xdr; 4989 __be32 *p, err; 4990 4991 p = xdr_reserve_space(xdr, 4); 4992 if (!p) 4993 return nfserr_resource; 4994 4995 *p = cpu_to_be32(getxattr->getxa_len); 4996 4997 if (getxattr->getxa_len == 0) 4998 return 0; 4999 5000 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf, 5001 getxattr->getxa_len); 5002 5003 kvfree(getxattr->getxa_buf); 5004 5005 return err; 5006 } 5007 5008 static __be32 5009 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5010 struct nfsd4_setxattr *setxattr) 5011 { 5012 struct xdr_stream *xdr = resp->xdr; 5013 __be32 *p; 5014 5015 p = xdr_reserve_space(xdr, 20); 5016 if (!p) 5017 return nfserr_resource; 5018 5019 encode_cinfo(p, &setxattr->setxa_cinfo); 5020 5021 return 0; 5022 } 5023 5024 /* 5025 * See if there are cookie values that can be rejected outright. 5026 */ 5027 static __be32 5028 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs, 5029 u32 *offsetp) 5030 { 5031 u64 cookie = listxattrs->lsxa_cookie; 5032 5033 /* 5034 * If the cookie is larger than the maximum number we can fit 5035 * in either the buffer we just got back from vfs_listxattr, or, 5036 * XDR-encoded, in the return buffer, it's invalid. 5037 */ 5038 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2)) 5039 return nfserr_badcookie; 5040 5041 if (cookie > (listxattrs->lsxa_maxcount / 5042 (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4))) 5043 return nfserr_badcookie; 5044 5045 *offsetp = (u32)cookie; 5046 return 0; 5047 } 5048 5049 static __be32 5050 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr, 5051 struct nfsd4_listxattrs *listxattrs) 5052 { 5053 struct xdr_stream *xdr = resp->xdr; 5054 u32 cookie_offset, count_offset, eof; 5055 u32 left, xdrleft, slen, count; 5056 u32 xdrlen, offset; 5057 u64 cookie; 5058 char *sp; 5059 __be32 status, tmp; 5060 __be32 *p; 5061 u32 nuser; 5062 5063 eof = 1; 5064 5065 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset); 5066 if (status) 5067 goto out; 5068 5069 /* 5070 * Reserve space for the cookie and the name array count. Record 5071 * the offsets to save them later. 5072 */ 5073 cookie_offset = xdr->buf->len; 5074 count_offset = cookie_offset + 8; 5075 p = xdr_reserve_space(xdr, 12); 5076 if (!p) { 5077 status = nfserr_resource; 5078 goto out; 5079 } 5080 5081 count = 0; 5082 left = listxattrs->lsxa_len; 5083 sp = listxattrs->lsxa_buf; 5084 nuser = 0; 5085 5086 xdrleft = listxattrs->lsxa_maxcount; 5087 5088 while (left > 0 && xdrleft > 0) { 5089 slen = strlen(sp); 5090 5091 /* 5092 * Check if this is a "user." attribute, skip it if not. 5093 */ 5094 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) 5095 goto contloop; 5096 5097 slen -= XATTR_USER_PREFIX_LEN; 5098 xdrlen = 4 + ((slen + 3) & ~3); 5099 if (xdrlen > xdrleft) { 5100 if (count == 0) { 5101 /* 5102 * Can't even fit the first attribute name. 5103 */ 5104 status = nfserr_toosmall; 5105 goto out; 5106 } 5107 eof = 0; 5108 goto wreof; 5109 } 5110 5111 left -= XATTR_USER_PREFIX_LEN; 5112 sp += XATTR_USER_PREFIX_LEN; 5113 if (nuser++ < offset) 5114 goto contloop; 5115 5116 5117 p = xdr_reserve_space(xdr, xdrlen); 5118 if (!p) { 5119 status = nfserr_resource; 5120 goto out; 5121 } 5122 5123 xdr_encode_opaque(p, sp, slen); 5124 5125 xdrleft -= xdrlen; 5126 count++; 5127 contloop: 5128 sp += slen + 1; 5129 left -= slen + 1; 5130 } 5131 5132 /* 5133 * If there were user attributes to copy, but we didn't copy 5134 * any, the offset was too large (e.g. the cookie was invalid). 5135 */ 5136 if (nuser > 0 && count == 0) { 5137 status = nfserr_badcookie; 5138 goto out; 5139 } 5140 5141 wreof: 5142 p = xdr_reserve_space(xdr, 4); 5143 if (!p) { 5144 status = nfserr_resource; 5145 goto out; 5146 } 5147 *p = cpu_to_be32(eof); 5148 5149 cookie = offset + count; 5150 5151 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8); 5152 tmp = cpu_to_be32(count); 5153 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4); 5154 out: 5155 if (listxattrs->lsxa_len) 5156 kvfree(listxattrs->lsxa_buf); 5157 return status; 5158 } 5159 5160 static __be32 5161 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr, 5162 struct nfsd4_removexattr *removexattr) 5163 { 5164 struct xdr_stream *xdr = resp->xdr; 5165 __be32 *p; 5166 5167 p = xdr_reserve_space(xdr, 20); 5168 if (!p) 5169 return nfserr_resource; 5170 5171 p = encode_cinfo(p, &removexattr->rmxa_cinfo); 5172 return 0; 5173 } 5174 5175 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *); 5176 5177 /* 5178 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1 5179 * since we don't need to filter out obsolete ops as this is 5180 * done in the decoding phase. 5181 */ 5182 static const nfsd4_enc nfsd4_enc_ops[] = { 5183 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access, 5184 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close, 5185 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit, 5186 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create, 5187 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop, 5188 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop, 5189 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr, 5190 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh, 5191 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link, 5192 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock, 5193 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt, 5194 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku, 5195 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop, 5196 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop, 5197 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop, 5198 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open, 5199 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop, 5200 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm, 5201 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade, 5202 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop, 5203 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop, 5204 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop, 5205 [OP_READ] = (nfsd4_enc)nfsd4_encode_read, 5206 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir, 5207 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink, 5208 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove, 5209 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename, 5210 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop, 5211 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop, 5212 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop, 5213 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo, 5214 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr, 5215 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid, 5216 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop, 5217 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop, 5218 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write, 5219 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop, 5220 5221 /* NFSv4.1 operations */ 5222 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop, 5223 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session, 5224 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id, 5225 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session, 5226 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop, 5227 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop, 5228 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 5229 #ifdef CONFIG_NFSD_PNFS 5230 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo, 5231 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 5232 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit, 5233 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget, 5234 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn, 5235 #else 5236 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop, 5237 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 5238 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop, 5239 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop, 5240 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop, 5241 #endif 5242 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name, 5243 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence, 5244 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop, 5245 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid, 5246 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 5247 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop, 5248 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop, 5249 5250 /* NFSv4.2 operations */ 5251 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 5252 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy, 5253 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_copy_notify, 5254 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 5255 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop, 5256 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop, 5257 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop, 5258 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop, 5259 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_offload_status, 5260 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_read_plus, 5261 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek, 5262 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop, 5263 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop, 5264 5265 /* RFC 8276 extended atributes operations */ 5266 [OP_GETXATTR] = (nfsd4_enc)nfsd4_encode_getxattr, 5267 [OP_SETXATTR] = (nfsd4_enc)nfsd4_encode_setxattr, 5268 [OP_LISTXATTRS] = (nfsd4_enc)nfsd4_encode_listxattrs, 5269 [OP_REMOVEXATTR] = (nfsd4_enc)nfsd4_encode_removexattr, 5270 }; 5271 5272 /* 5273 * Calculate whether we still have space to encode repsize bytes. 5274 * There are two considerations: 5275 * - For NFS versions >=4.1, the size of the reply must stay within 5276 * session limits 5277 * - For all NFS versions, we must stay within limited preallocated 5278 * buffer space. 5279 * 5280 * This is called before the operation is processed, so can only provide 5281 * an upper estimate. For some nonidempotent operations (such as 5282 * getattr), it's not necessarily a problem if that estimate is wrong, 5283 * as we can fail it after processing without significant side effects. 5284 */ 5285 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize) 5286 { 5287 struct xdr_buf *buf = &resp->rqstp->rq_res; 5288 struct nfsd4_slot *slot = resp->cstate.slot; 5289 5290 if (buf->len + respsize <= buf->buflen) 5291 return nfs_ok; 5292 if (!nfsd4_has_session(&resp->cstate)) 5293 return nfserr_resource; 5294 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) { 5295 WARN_ON_ONCE(1); 5296 return nfserr_rep_too_big_to_cache; 5297 } 5298 return nfserr_rep_too_big; 5299 } 5300 5301 void 5302 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 5303 { 5304 struct xdr_stream *xdr = resp->xdr; 5305 struct nfs4_stateowner *so = resp->cstate.replay_owner; 5306 struct svc_rqst *rqstp = resp->rqstp; 5307 const struct nfsd4_operation *opdesc = op->opdesc; 5308 int post_err_offset; 5309 nfsd4_enc encoder; 5310 __be32 *p; 5311 5312 p = xdr_reserve_space(xdr, 8); 5313 if (!p) { 5314 WARN_ON_ONCE(1); 5315 return; 5316 } 5317 *p++ = cpu_to_be32(op->opnum); 5318 post_err_offset = xdr->buf->len; 5319 5320 if (op->opnum == OP_ILLEGAL) 5321 goto status; 5322 if (op->status && opdesc && 5323 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE)) 5324 goto status; 5325 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || 5326 !nfsd4_enc_ops[op->opnum]); 5327 encoder = nfsd4_enc_ops[op->opnum]; 5328 op->status = encoder(resp, op->status, &op->u); 5329 if (op->status) 5330 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status); 5331 if (opdesc && opdesc->op_release) 5332 opdesc->op_release(&op->u); 5333 xdr_commit_encode(xdr); 5334 5335 /* nfsd4_check_resp_size guarantees enough room for error status */ 5336 if (!op->status) { 5337 int space_needed = 0; 5338 if (!nfsd4_last_compound_op(rqstp)) 5339 space_needed = COMPOUND_ERR_SLACK_SPACE; 5340 op->status = nfsd4_check_resp_size(resp, space_needed); 5341 } 5342 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) { 5343 struct nfsd4_slot *slot = resp->cstate.slot; 5344 5345 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) 5346 op->status = nfserr_rep_too_big_to_cache; 5347 else 5348 op->status = nfserr_rep_too_big; 5349 } 5350 if (op->status == nfserr_resource || 5351 op->status == nfserr_rep_too_big || 5352 op->status == nfserr_rep_too_big_to_cache) { 5353 /* 5354 * The operation may have already been encoded or 5355 * partially encoded. No op returns anything additional 5356 * in the case of one of these three errors, so we can 5357 * just truncate back to after the status. But it's a 5358 * bug if we had to do this on a non-idempotent op: 5359 */ 5360 warn_on_nonidempotent_op(op); 5361 xdr_truncate_encode(xdr, post_err_offset); 5362 } 5363 if (so) { 5364 int len = xdr->buf->len - post_err_offset; 5365 5366 so->so_replay.rp_status = op->status; 5367 so->so_replay.rp_buflen = len; 5368 read_bytes_from_xdr_buf(xdr->buf, post_err_offset, 5369 so->so_replay.rp_buf, len); 5370 } 5371 status: 5372 /* Note that op->status is already in network byte order: */ 5373 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4); 5374 } 5375 5376 /* 5377 * Encode the reply stored in the stateowner reply cache 5378 * 5379 * XDR note: do not encode rp->rp_buflen: the buffer contains the 5380 * previously sent already encoded operation. 5381 */ 5382 void 5383 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op) 5384 { 5385 __be32 *p; 5386 struct nfs4_replay *rp = op->replay; 5387 5388 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen); 5389 if (!p) { 5390 WARN_ON_ONCE(1); 5391 return; 5392 } 5393 *p++ = cpu_to_be32(op->opnum); 5394 *p++ = rp->rp_status; /* already xdr'ed */ 5395 5396 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen); 5397 } 5398 5399 void nfsd4_release_compoundargs(struct svc_rqst *rqstp) 5400 { 5401 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5402 5403 if (args->ops != args->iops) { 5404 kfree(args->ops); 5405 args->ops = args->iops; 5406 } 5407 while (args->to_free) { 5408 struct svcxdr_tmpbuf *tb = args->to_free; 5409 args->to_free = tb->next; 5410 kfree(tb); 5411 } 5412 } 5413 5414 bool 5415 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5416 { 5417 struct nfsd4_compoundargs *args = rqstp->rq_argp; 5418 5419 /* svcxdr_tmp_alloc */ 5420 args->to_free = NULL; 5421 5422 args->xdr = xdr; 5423 args->ops = args->iops; 5424 args->rqstp = rqstp; 5425 5426 return nfsd4_decode_compound(args); 5427 } 5428 5429 bool 5430 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr) 5431 { 5432 struct nfsd4_compoundres *resp = rqstp->rq_resp; 5433 struct xdr_buf *buf = xdr->buf; 5434 __be32 *p; 5435 5436 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len + 5437 buf->tail[0].iov_len); 5438 5439 /* 5440 * Send buffer space for the following items is reserved 5441 * at the top of nfsd4_proc_compound(). 5442 */ 5443 p = resp->statusp; 5444 5445 *p++ = resp->cstate.status; 5446 5447 rqstp->rq_next_page = xdr->page_ptr + 1; 5448 5449 *p++ = htonl(resp->taglen); 5450 memcpy(p, resp->tag, resp->taglen); 5451 p += XDR_QUADLEN(resp->taglen); 5452 *p++ = htonl(resp->opcnt); 5453 5454 nfsd4_sequence_done(resp); 5455 return true; 5456 } 5457