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 44 #include "idmap.h" 45 #include "acl.h" 46 #include "xdr4.h" 47 #include "vfs.h" 48 #include "state.h" 49 #include "cache.h" 50 #include "netns.h" 51 #include "pnfs.h" 52 53 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 54 #include <linux/security.h> 55 #endif 56 57 58 #define NFSDDBG_FACILITY NFSDDBG_XDR 59 60 const u32 nfsd_suppattrs[3][3] = { 61 {NFSD4_SUPPORTED_ATTRS_WORD0, 62 NFSD4_SUPPORTED_ATTRS_WORD1, 63 NFSD4_SUPPORTED_ATTRS_WORD2}, 64 65 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 66 NFSD4_1_SUPPORTED_ATTRS_WORD1, 67 NFSD4_1_SUPPORTED_ATTRS_WORD2}, 68 69 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 70 NFSD4_1_SUPPORTED_ATTRS_WORD1, 71 NFSD4_2_SUPPORTED_ATTRS_WORD2}, 72 }; 73 74 /* 75 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing 76 * directory in order to indicate to the client that a filesystem boundary is present 77 * We use a fixed fsid for a referral 78 */ 79 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL 80 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL 81 82 static __be32 83 check_filename(char *str, int len) 84 { 85 int i; 86 87 if (len == 0) 88 return nfserr_inval; 89 if (isdotent(str, len)) 90 return nfserr_badname; 91 for (i = 0; i < len; i++) 92 if (str[i] == '/') 93 return nfserr_badname; 94 return 0; 95 } 96 97 #define DECODE_HEAD \ 98 __be32 *p; \ 99 __be32 status 100 #define DECODE_TAIL \ 101 status = 0; \ 102 out: \ 103 return status; \ 104 xdr_error: \ 105 dprintk("NFSD: xdr error (%s:%d)\n", \ 106 __FILE__, __LINE__); \ 107 status = nfserr_bad_xdr; \ 108 goto out 109 110 #define READMEM(x,nbytes) do { \ 111 x = (char *)p; \ 112 p += XDR_QUADLEN(nbytes); \ 113 } while (0) 114 #define SAVEMEM(x,nbytes) do { \ 115 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \ 116 savemem(argp, p, nbytes) : \ 117 (char *)p)) { \ 118 dprintk("NFSD: xdr error (%s:%d)\n", \ 119 __FILE__, __LINE__); \ 120 goto xdr_error; \ 121 } \ 122 p += XDR_QUADLEN(nbytes); \ 123 } while (0) 124 #define COPYMEM(x,nbytes) do { \ 125 memcpy((x), p, nbytes); \ 126 p += XDR_QUADLEN(nbytes); \ 127 } while (0) 128 129 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */ 130 #define READ_BUF(nbytes) do { \ 131 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \ 132 p = argp->p; \ 133 argp->p += XDR_QUADLEN(nbytes); \ 134 } else if (!(p = read_buf(argp, nbytes))) { \ 135 dprintk("NFSD: xdr error (%s:%d)\n", \ 136 __FILE__, __LINE__); \ 137 goto xdr_error; \ 138 } \ 139 } while (0) 140 141 static void next_decode_page(struct nfsd4_compoundargs *argp) 142 { 143 argp->p = page_address(argp->pagelist[0]); 144 argp->pagelist++; 145 if (argp->pagelen < PAGE_SIZE) { 146 argp->end = argp->p + XDR_QUADLEN(argp->pagelen); 147 argp->pagelen = 0; 148 } else { 149 argp->end = argp->p + (PAGE_SIZE>>2); 150 argp->pagelen -= PAGE_SIZE; 151 } 152 } 153 154 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes) 155 { 156 /* We want more bytes than seem to be available. 157 * Maybe we need a new page, maybe we have just run out 158 */ 159 unsigned int avail = (char *)argp->end - (char *)argp->p; 160 __be32 *p; 161 162 if (argp->pagelen == 0) { 163 struct kvec *vec = &argp->rqstp->rq_arg.tail[0]; 164 165 if (!argp->tail) { 166 argp->tail = true; 167 avail = vec->iov_len; 168 argp->p = vec->iov_base; 169 argp->end = vec->iov_base + avail; 170 } 171 172 if (avail < nbytes) 173 return NULL; 174 175 p = argp->p; 176 argp->p += XDR_QUADLEN(nbytes); 177 return p; 178 } 179 180 if (avail + argp->pagelen < nbytes) 181 return NULL; 182 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */ 183 return NULL; 184 /* ok, we can do it with the current plus the next page */ 185 if (nbytes <= sizeof(argp->tmp)) 186 p = argp->tmp; 187 else { 188 kfree(argp->tmpp); 189 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL); 190 if (!p) 191 return NULL; 192 193 } 194 /* 195 * The following memcpy is safe because read_buf is always 196 * called with nbytes > avail, and the two cases above both 197 * guarantee p points to at least nbytes bytes. 198 */ 199 memcpy(p, argp->p, avail); 200 next_decode_page(argp); 201 memcpy(((char*)p)+avail, argp->p, (nbytes - avail)); 202 argp->p += XDR_QUADLEN(nbytes - avail); 203 return p; 204 } 205 206 static int zero_clientid(clientid_t *clid) 207 { 208 return (clid->cl_boot == 0) && (clid->cl_id == 0); 209 } 210 211 /** 212 * svcxdr_tmpalloc - allocate memory to be freed after compound processing 213 * @argp: NFSv4 compound argument structure 214 * @p: pointer to be freed (with kfree()) 215 * 216 * Marks @p to be freed when processing the compound operation 217 * described in @argp finishes. 218 */ 219 static void * 220 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len) 221 { 222 struct svcxdr_tmpbuf *tb; 223 224 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL); 225 if (!tb) 226 return NULL; 227 tb->next = argp->to_free; 228 argp->to_free = tb; 229 return tb->buf; 230 } 231 232 /* 233 * For xdr strings that need to be passed to other kernel api's 234 * as null-terminated strings. 235 * 236 * Note null-terminating in place usually isn't safe since the 237 * buffer might end on a page boundary. 238 */ 239 static char * 240 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len) 241 { 242 char *p = svcxdr_tmpalloc(argp, len + 1); 243 244 if (!p) 245 return NULL; 246 memcpy(p, buf, len); 247 p[len] = '\0'; 248 return p; 249 } 250 251 /** 252 * savemem - duplicate a chunk of memory for later processing 253 * @argp: NFSv4 compound argument structure to be freed with 254 * @p: pointer to be duplicated 255 * @nbytes: length to be duplicated 256 * 257 * Returns a pointer to a copy of @nbytes bytes of memory at @p 258 * that are preserved until processing of the NFSv4 compound 259 * operation described by @argp finishes. 260 */ 261 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes) 262 { 263 void *ret; 264 265 ret = svcxdr_tmpalloc(argp, nbytes); 266 if (!ret) 267 return NULL; 268 memcpy(ret, p, nbytes); 269 return ret; 270 } 271 272 /* 273 * We require the high 32 bits of 'seconds' to be 0, and 274 * we ignore all 32 bits of 'nseconds'. 275 */ 276 static __be32 277 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv) 278 { 279 DECODE_HEAD; 280 u64 sec; 281 282 READ_BUF(12); 283 p = xdr_decode_hyper(p, &sec); 284 tv->tv_sec = sec; 285 tv->tv_nsec = be32_to_cpup(p++); 286 if (tv->tv_nsec >= (u32)1000000000) 287 return nfserr_inval; 288 289 DECODE_TAIL; 290 } 291 292 static __be32 293 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval) 294 { 295 u32 bmlen; 296 DECODE_HEAD; 297 298 bmval[0] = 0; 299 bmval[1] = 0; 300 bmval[2] = 0; 301 302 READ_BUF(4); 303 bmlen = be32_to_cpup(p++); 304 if (bmlen > 1000) 305 goto xdr_error; 306 307 READ_BUF(bmlen << 2); 308 if (bmlen > 0) 309 bmval[0] = be32_to_cpup(p++); 310 if (bmlen > 1) 311 bmval[1] = be32_to_cpup(p++); 312 if (bmlen > 2) 313 bmval[2] = be32_to_cpup(p++); 314 315 DECODE_TAIL; 316 } 317 318 static __be32 319 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, 320 struct iattr *iattr, struct nfs4_acl **acl, 321 struct xdr_netobj *label, int *umask) 322 { 323 struct timespec ts; 324 int expected_len, len = 0; 325 u32 dummy32; 326 char *buf; 327 328 DECODE_HEAD; 329 iattr->ia_valid = 0; 330 if ((status = nfsd4_decode_bitmap(argp, bmval))) 331 return status; 332 333 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0 334 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1 335 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) { 336 if (nfsd_attrs_supported(argp->minorversion, bmval)) 337 return nfserr_inval; 338 return nfserr_attrnotsupp; 339 } 340 341 READ_BUF(4); 342 expected_len = be32_to_cpup(p++); 343 344 if (bmval[0] & FATTR4_WORD0_SIZE) { 345 READ_BUF(8); 346 len += 8; 347 p = xdr_decode_hyper(p, &iattr->ia_size); 348 iattr->ia_valid |= ATTR_SIZE; 349 } 350 if (bmval[0] & FATTR4_WORD0_ACL) { 351 u32 nace; 352 struct nfs4_ace *ace; 353 354 READ_BUF(4); len += 4; 355 nace = be32_to_cpup(p++); 356 357 if (nace > NFS4_ACL_MAX) 358 return nfserr_fbig; 359 360 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace)); 361 if (*acl == NULL) 362 return nfserr_jukebox; 363 364 (*acl)->naces = nace; 365 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) { 366 READ_BUF(16); len += 16; 367 ace->type = be32_to_cpup(p++); 368 ace->flag = be32_to_cpup(p++); 369 ace->access_mask = be32_to_cpup(p++); 370 dummy32 = be32_to_cpup(p++); 371 READ_BUF(dummy32); 372 len += XDR_QUADLEN(dummy32) << 2; 373 READMEM(buf, dummy32); 374 ace->whotype = nfs4_acl_get_whotype(buf, dummy32); 375 status = nfs_ok; 376 if (ace->whotype != NFS4_ACL_WHO_NAMED) 377 ; 378 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 379 status = nfsd_map_name_to_gid(argp->rqstp, 380 buf, dummy32, &ace->who_gid); 381 else 382 status = nfsd_map_name_to_uid(argp->rqstp, 383 buf, dummy32, &ace->who_uid); 384 if (status) 385 return status; 386 } 387 } else 388 *acl = NULL; 389 if (bmval[1] & FATTR4_WORD1_MODE) { 390 READ_BUF(4); 391 len += 4; 392 iattr->ia_mode = be32_to_cpup(p++); 393 iattr->ia_mode &= (S_IFMT | S_IALLUGO); 394 iattr->ia_valid |= ATTR_MODE; 395 } 396 if (bmval[1] & FATTR4_WORD1_OWNER) { 397 READ_BUF(4); 398 len += 4; 399 dummy32 = be32_to_cpup(p++); 400 READ_BUF(dummy32); 401 len += (XDR_QUADLEN(dummy32) << 2); 402 READMEM(buf, dummy32); 403 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid))) 404 return status; 405 iattr->ia_valid |= ATTR_UID; 406 } 407 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { 408 READ_BUF(4); 409 len += 4; 410 dummy32 = be32_to_cpup(p++); 411 READ_BUF(dummy32); 412 len += (XDR_QUADLEN(dummy32) << 2); 413 READMEM(buf, dummy32); 414 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid))) 415 return status; 416 iattr->ia_valid |= ATTR_GID; 417 } 418 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { 419 READ_BUF(4); 420 len += 4; 421 dummy32 = be32_to_cpup(p++); 422 switch (dummy32) { 423 case NFS4_SET_TO_CLIENT_TIME: 424 len += 12; 425 status = nfsd4_decode_time(argp, &ts); 426 iattr->ia_atime = timespec_to_timespec64(ts); 427 if (status) 428 return status; 429 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 430 break; 431 case NFS4_SET_TO_SERVER_TIME: 432 iattr->ia_valid |= ATTR_ATIME; 433 break; 434 default: 435 goto xdr_error; 436 } 437 } 438 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 439 READ_BUF(4); 440 len += 4; 441 dummy32 = be32_to_cpup(p++); 442 switch (dummy32) { 443 case NFS4_SET_TO_CLIENT_TIME: 444 len += 12; 445 status = nfsd4_decode_time(argp, &ts); 446 iattr->ia_mtime = timespec_to_timespec64(ts); 447 if (status) 448 return status; 449 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 450 break; 451 case NFS4_SET_TO_SERVER_TIME: 452 iattr->ia_valid |= ATTR_MTIME; 453 break; 454 default: 455 goto xdr_error; 456 } 457 } 458 459 label->len = 0; 460 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) && 461 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) { 462 READ_BUF(4); 463 len += 4; 464 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */ 465 READ_BUF(4); 466 len += 4; 467 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */ 468 READ_BUF(4); 469 len += 4; 470 dummy32 = be32_to_cpup(p++); 471 READ_BUF(dummy32); 472 if (dummy32 > NFS4_MAXLABELLEN) 473 return nfserr_badlabel; 474 len += (XDR_QUADLEN(dummy32) << 2); 475 READMEM(buf, dummy32); 476 label->len = dummy32; 477 label->data = svcxdr_dupstr(argp, buf, dummy32); 478 if (!label->data) 479 return nfserr_jukebox; 480 } 481 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) { 482 if (!umask) 483 goto xdr_error; 484 READ_BUF(8); 485 len += 8; 486 dummy32 = be32_to_cpup(p++); 487 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO); 488 dummy32 = be32_to_cpup(p++); 489 *umask = dummy32 & S_IRWXUGO; 490 iattr->ia_valid |= ATTR_MODE; 491 } 492 if (len != expected_len) 493 goto xdr_error; 494 495 DECODE_TAIL; 496 } 497 498 static __be32 499 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid) 500 { 501 DECODE_HEAD; 502 503 READ_BUF(sizeof(stateid_t)); 504 sid->si_generation = be32_to_cpup(p++); 505 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t)); 506 507 DECODE_TAIL; 508 } 509 510 static __be32 511 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access) 512 { 513 DECODE_HEAD; 514 515 READ_BUF(4); 516 access->ac_req_access = be32_to_cpup(p++); 517 518 DECODE_TAIL; 519 } 520 521 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs) 522 { 523 DECODE_HEAD; 524 u32 dummy, uid, gid; 525 char *machine_name; 526 int i; 527 int nr_secflavs; 528 529 /* callback_sec_params4 */ 530 READ_BUF(4); 531 nr_secflavs = be32_to_cpup(p++); 532 if (nr_secflavs) 533 cbs->flavor = (u32)(-1); 534 else 535 /* Is this legal? Be generous, take it to mean AUTH_NONE: */ 536 cbs->flavor = 0; 537 for (i = 0; i < nr_secflavs; ++i) { 538 READ_BUF(4); 539 dummy = be32_to_cpup(p++); 540 switch (dummy) { 541 case RPC_AUTH_NULL: 542 /* Nothing to read */ 543 if (cbs->flavor == (u32)(-1)) 544 cbs->flavor = RPC_AUTH_NULL; 545 break; 546 case RPC_AUTH_UNIX: 547 READ_BUF(8); 548 /* stamp */ 549 dummy = be32_to_cpup(p++); 550 551 /* machine name */ 552 dummy = be32_to_cpup(p++); 553 READ_BUF(dummy); 554 SAVEMEM(machine_name, dummy); 555 556 /* uid, gid */ 557 READ_BUF(8); 558 uid = be32_to_cpup(p++); 559 gid = be32_to_cpup(p++); 560 561 /* more gids */ 562 READ_BUF(4); 563 dummy = be32_to_cpup(p++); 564 READ_BUF(dummy * 4); 565 if (cbs->flavor == (u32)(-1)) { 566 kuid_t kuid = make_kuid(&init_user_ns, uid); 567 kgid_t kgid = make_kgid(&init_user_ns, gid); 568 if (uid_valid(kuid) && gid_valid(kgid)) { 569 cbs->uid = kuid; 570 cbs->gid = kgid; 571 cbs->flavor = RPC_AUTH_UNIX; 572 } else { 573 dprintk("RPC_AUTH_UNIX with invalid" 574 "uid or gid ignoring!\n"); 575 } 576 } 577 break; 578 case RPC_AUTH_GSS: 579 dprintk("RPC_AUTH_GSS callback secflavor " 580 "not supported!\n"); 581 READ_BUF(8); 582 /* gcbp_service */ 583 dummy = be32_to_cpup(p++); 584 /* gcbp_handle_from_server */ 585 dummy = be32_to_cpup(p++); 586 READ_BUF(dummy); 587 p += XDR_QUADLEN(dummy); 588 /* gcbp_handle_from_client */ 589 READ_BUF(4); 590 dummy = be32_to_cpup(p++); 591 READ_BUF(dummy); 592 break; 593 default: 594 dprintk("Illegal callback secflavor\n"); 595 return nfserr_inval; 596 } 597 } 598 DECODE_TAIL; 599 } 600 601 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc) 602 { 603 DECODE_HEAD; 604 605 READ_BUF(4); 606 bc->bc_cb_program = be32_to_cpup(p++); 607 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec); 608 609 DECODE_TAIL; 610 } 611 612 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts) 613 { 614 DECODE_HEAD; 615 616 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8); 617 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN); 618 bcts->dir = be32_to_cpup(p++); 619 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker 620 * could help us figure out we should be using it. */ 621 DECODE_TAIL; 622 } 623 624 static __be32 625 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close) 626 { 627 DECODE_HEAD; 628 629 READ_BUF(4); 630 close->cl_seqid = be32_to_cpup(p++); 631 return nfsd4_decode_stateid(argp, &close->cl_stateid); 632 633 DECODE_TAIL; 634 } 635 636 637 static __be32 638 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit) 639 { 640 DECODE_HEAD; 641 642 READ_BUF(12); 643 p = xdr_decode_hyper(p, &commit->co_offset); 644 commit->co_count = be32_to_cpup(p++); 645 646 DECODE_TAIL; 647 } 648 649 static __be32 650 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) 651 { 652 DECODE_HEAD; 653 654 READ_BUF(4); 655 create->cr_type = be32_to_cpup(p++); 656 switch (create->cr_type) { 657 case NF4LNK: 658 READ_BUF(4); 659 create->cr_datalen = be32_to_cpup(p++); 660 READ_BUF(create->cr_datalen); 661 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen); 662 if (!create->cr_data) 663 return nfserr_jukebox; 664 break; 665 case NF4BLK: 666 case NF4CHR: 667 READ_BUF(8); 668 create->cr_specdata1 = be32_to_cpup(p++); 669 create->cr_specdata2 = be32_to_cpup(p++); 670 break; 671 case NF4SOCK: 672 case NF4FIFO: 673 case NF4DIR: 674 default: 675 break; 676 } 677 678 READ_BUF(4); 679 create->cr_namelen = be32_to_cpup(p++); 680 READ_BUF(create->cr_namelen); 681 SAVEMEM(create->cr_name, create->cr_namelen); 682 if ((status = check_filename(create->cr_name, create->cr_namelen))) 683 return status; 684 685 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, 686 &create->cr_acl, &create->cr_label, 687 &create->cr_umask); 688 if (status) 689 goto out; 690 691 DECODE_TAIL; 692 } 693 694 static inline __be32 695 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr) 696 { 697 return nfsd4_decode_stateid(argp, &dr->dr_stateid); 698 } 699 700 static inline __be32 701 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr) 702 { 703 return nfsd4_decode_bitmap(argp, getattr->ga_bmval); 704 } 705 706 static __be32 707 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link) 708 { 709 DECODE_HEAD; 710 711 READ_BUF(4); 712 link->li_namelen = be32_to_cpup(p++); 713 READ_BUF(link->li_namelen); 714 SAVEMEM(link->li_name, link->li_namelen); 715 if ((status = check_filename(link->li_name, link->li_namelen))) 716 return status; 717 718 DECODE_TAIL; 719 } 720 721 static __be32 722 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 723 { 724 DECODE_HEAD; 725 726 /* 727 * type, reclaim(boolean), offset, length, new_lock_owner(boolean) 728 */ 729 READ_BUF(28); 730 lock->lk_type = be32_to_cpup(p++); 731 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 732 goto xdr_error; 733 lock->lk_reclaim = be32_to_cpup(p++); 734 p = xdr_decode_hyper(p, &lock->lk_offset); 735 p = xdr_decode_hyper(p, &lock->lk_length); 736 lock->lk_is_new = be32_to_cpup(p++); 737 738 if (lock->lk_is_new) { 739 READ_BUF(4); 740 lock->lk_new_open_seqid = be32_to_cpup(p++); 741 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid); 742 if (status) 743 return status; 744 READ_BUF(8 + sizeof(clientid_t)); 745 lock->lk_new_lock_seqid = be32_to_cpup(p++); 746 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t)); 747 lock->lk_new_owner.len = be32_to_cpup(p++); 748 READ_BUF(lock->lk_new_owner.len); 749 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len); 750 } else { 751 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid); 752 if (status) 753 return status; 754 READ_BUF(4); 755 lock->lk_old_lock_seqid = be32_to_cpup(p++); 756 } 757 758 DECODE_TAIL; 759 } 760 761 static __be32 762 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt) 763 { 764 DECODE_HEAD; 765 766 READ_BUF(32); 767 lockt->lt_type = be32_to_cpup(p++); 768 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 769 goto xdr_error; 770 p = xdr_decode_hyper(p, &lockt->lt_offset); 771 p = xdr_decode_hyper(p, &lockt->lt_length); 772 COPYMEM(&lockt->lt_clientid, 8); 773 lockt->lt_owner.len = be32_to_cpup(p++); 774 READ_BUF(lockt->lt_owner.len); 775 READMEM(lockt->lt_owner.data, lockt->lt_owner.len); 776 777 DECODE_TAIL; 778 } 779 780 static __be32 781 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku) 782 { 783 DECODE_HEAD; 784 785 READ_BUF(8); 786 locku->lu_type = be32_to_cpup(p++); 787 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 788 goto xdr_error; 789 locku->lu_seqid = be32_to_cpup(p++); 790 status = nfsd4_decode_stateid(argp, &locku->lu_stateid); 791 if (status) 792 return status; 793 READ_BUF(16); 794 p = xdr_decode_hyper(p, &locku->lu_offset); 795 p = xdr_decode_hyper(p, &locku->lu_length); 796 797 DECODE_TAIL; 798 } 799 800 static __be32 801 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup) 802 { 803 DECODE_HEAD; 804 805 READ_BUF(4); 806 lookup->lo_len = be32_to_cpup(p++); 807 READ_BUF(lookup->lo_len); 808 SAVEMEM(lookup->lo_name, lookup->lo_len); 809 if ((status = check_filename(lookup->lo_name, lookup->lo_len))) 810 return status; 811 812 DECODE_TAIL; 813 } 814 815 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when) 816 { 817 __be32 *p; 818 u32 w; 819 820 READ_BUF(4); 821 w = be32_to_cpup(p++); 822 *share_access = w & NFS4_SHARE_ACCESS_MASK; 823 *deleg_want = w & NFS4_SHARE_WANT_MASK; 824 if (deleg_when) 825 *deleg_when = w & NFS4_SHARE_WHEN_MASK; 826 827 switch (w & NFS4_SHARE_ACCESS_MASK) { 828 case NFS4_SHARE_ACCESS_READ: 829 case NFS4_SHARE_ACCESS_WRITE: 830 case NFS4_SHARE_ACCESS_BOTH: 831 break; 832 default: 833 return nfserr_bad_xdr; 834 } 835 w &= ~NFS4_SHARE_ACCESS_MASK; 836 if (!w) 837 return nfs_ok; 838 if (!argp->minorversion) 839 return nfserr_bad_xdr; 840 switch (w & NFS4_SHARE_WANT_MASK) { 841 case NFS4_SHARE_WANT_NO_PREFERENCE: 842 case NFS4_SHARE_WANT_READ_DELEG: 843 case NFS4_SHARE_WANT_WRITE_DELEG: 844 case NFS4_SHARE_WANT_ANY_DELEG: 845 case NFS4_SHARE_WANT_NO_DELEG: 846 case NFS4_SHARE_WANT_CANCEL: 847 break; 848 default: 849 return nfserr_bad_xdr; 850 } 851 w &= ~NFS4_SHARE_WANT_MASK; 852 if (!w) 853 return nfs_ok; 854 855 if (!deleg_when) /* open_downgrade */ 856 return nfserr_inval; 857 switch (w) { 858 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL: 859 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED: 860 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL | 861 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED): 862 return nfs_ok; 863 } 864 xdr_error: 865 return nfserr_bad_xdr; 866 } 867 868 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x) 869 { 870 __be32 *p; 871 872 READ_BUF(4); 873 *x = be32_to_cpup(p++); 874 /* Note: unlinke access bits, deny bits may be zero. */ 875 if (*x & ~NFS4_SHARE_DENY_BOTH) 876 return nfserr_bad_xdr; 877 return nfs_ok; 878 xdr_error: 879 return nfserr_bad_xdr; 880 } 881 882 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o) 883 { 884 __be32 *p; 885 886 READ_BUF(4); 887 o->len = be32_to_cpup(p++); 888 889 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT) 890 return nfserr_bad_xdr; 891 892 READ_BUF(o->len); 893 SAVEMEM(o->data, o->len); 894 return nfs_ok; 895 xdr_error: 896 return nfserr_bad_xdr; 897 } 898 899 static __be32 900 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 901 { 902 DECODE_HEAD; 903 u32 dummy; 904 905 memset(open->op_bmval, 0, sizeof(open->op_bmval)); 906 open->op_iattr.ia_valid = 0; 907 open->op_openowner = NULL; 908 909 open->op_xdr_error = 0; 910 /* seqid, share_access, share_deny, clientid, ownerlen */ 911 READ_BUF(4); 912 open->op_seqid = be32_to_cpup(p++); 913 /* decode, yet ignore deleg_when until supported */ 914 status = nfsd4_decode_share_access(argp, &open->op_share_access, 915 &open->op_deleg_want, &dummy); 916 if (status) 917 goto xdr_error; 918 status = nfsd4_decode_share_deny(argp, &open->op_share_deny); 919 if (status) 920 goto xdr_error; 921 READ_BUF(sizeof(clientid_t)); 922 COPYMEM(&open->op_clientid, sizeof(clientid_t)); 923 status = nfsd4_decode_opaque(argp, &open->op_owner); 924 if (status) 925 goto xdr_error; 926 READ_BUF(4); 927 open->op_create = be32_to_cpup(p++); 928 switch (open->op_create) { 929 case NFS4_OPEN_NOCREATE: 930 break; 931 case NFS4_OPEN_CREATE: 932 READ_BUF(4); 933 open->op_createmode = be32_to_cpup(p++); 934 switch (open->op_createmode) { 935 case NFS4_CREATE_UNCHECKED: 936 case NFS4_CREATE_GUARDED: 937 status = nfsd4_decode_fattr(argp, open->op_bmval, 938 &open->op_iattr, &open->op_acl, &open->op_label, 939 &open->op_umask); 940 if (status) 941 goto out; 942 break; 943 case NFS4_CREATE_EXCLUSIVE: 944 READ_BUF(NFS4_VERIFIER_SIZE); 945 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE); 946 break; 947 case NFS4_CREATE_EXCLUSIVE4_1: 948 if (argp->minorversion < 1) 949 goto xdr_error; 950 READ_BUF(NFS4_VERIFIER_SIZE); 951 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE); 952 status = nfsd4_decode_fattr(argp, open->op_bmval, 953 &open->op_iattr, &open->op_acl, &open->op_label, 954 &open->op_umask); 955 if (status) 956 goto out; 957 break; 958 default: 959 goto xdr_error; 960 } 961 break; 962 default: 963 goto xdr_error; 964 } 965 966 /* open_claim */ 967 READ_BUF(4); 968 open->op_claim_type = be32_to_cpup(p++); 969 switch (open->op_claim_type) { 970 case NFS4_OPEN_CLAIM_NULL: 971 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 972 READ_BUF(4); 973 open->op_fname.len = be32_to_cpup(p++); 974 READ_BUF(open->op_fname.len); 975 SAVEMEM(open->op_fname.data, open->op_fname.len); 976 if ((status = check_filename(open->op_fname.data, open->op_fname.len))) 977 return status; 978 break; 979 case NFS4_OPEN_CLAIM_PREVIOUS: 980 READ_BUF(4); 981 open->op_delegate_type = be32_to_cpup(p++); 982 break; 983 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 984 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid); 985 if (status) 986 return status; 987 READ_BUF(4); 988 open->op_fname.len = be32_to_cpup(p++); 989 READ_BUF(open->op_fname.len); 990 SAVEMEM(open->op_fname.data, open->op_fname.len); 991 if ((status = check_filename(open->op_fname.data, open->op_fname.len))) 992 return status; 993 break; 994 case NFS4_OPEN_CLAIM_FH: 995 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 996 if (argp->minorversion < 1) 997 goto xdr_error; 998 /* void */ 999 break; 1000 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1001 if (argp->minorversion < 1) 1002 goto xdr_error; 1003 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid); 1004 if (status) 1005 return status; 1006 break; 1007 default: 1008 goto xdr_error; 1009 } 1010 1011 DECODE_TAIL; 1012 } 1013 1014 static __be32 1015 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf) 1016 { 1017 DECODE_HEAD; 1018 1019 if (argp->minorversion >= 1) 1020 return nfserr_notsupp; 1021 1022 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid); 1023 if (status) 1024 return status; 1025 READ_BUF(4); 1026 open_conf->oc_seqid = be32_to_cpup(p++); 1027 1028 DECODE_TAIL; 1029 } 1030 1031 static __be32 1032 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down) 1033 { 1034 DECODE_HEAD; 1035 1036 status = nfsd4_decode_stateid(argp, &open_down->od_stateid); 1037 if (status) 1038 return status; 1039 READ_BUF(4); 1040 open_down->od_seqid = be32_to_cpup(p++); 1041 status = nfsd4_decode_share_access(argp, &open_down->od_share_access, 1042 &open_down->od_deleg_want, NULL); 1043 if (status) 1044 return status; 1045 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny); 1046 if (status) 1047 return status; 1048 DECODE_TAIL; 1049 } 1050 1051 static __be32 1052 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh) 1053 { 1054 DECODE_HEAD; 1055 1056 READ_BUF(4); 1057 putfh->pf_fhlen = be32_to_cpup(p++); 1058 if (putfh->pf_fhlen > NFS4_FHSIZE) 1059 goto xdr_error; 1060 READ_BUF(putfh->pf_fhlen); 1061 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen); 1062 1063 DECODE_TAIL; 1064 } 1065 1066 static __be32 1067 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p) 1068 { 1069 if (argp->minorversion == 0) 1070 return nfs_ok; 1071 return nfserr_notsupp; 1072 } 1073 1074 static __be32 1075 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read) 1076 { 1077 DECODE_HEAD; 1078 1079 status = nfsd4_decode_stateid(argp, &read->rd_stateid); 1080 if (status) 1081 return status; 1082 READ_BUF(12); 1083 p = xdr_decode_hyper(p, &read->rd_offset); 1084 read->rd_length = be32_to_cpup(p++); 1085 1086 DECODE_TAIL; 1087 } 1088 1089 static __be32 1090 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir) 1091 { 1092 DECODE_HEAD; 1093 1094 READ_BUF(24); 1095 p = xdr_decode_hyper(p, &readdir->rd_cookie); 1096 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data)); 1097 readdir->rd_dircount = be32_to_cpup(p++); 1098 readdir->rd_maxcount = be32_to_cpup(p++); 1099 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval))) 1100 goto out; 1101 1102 DECODE_TAIL; 1103 } 1104 1105 static __be32 1106 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove) 1107 { 1108 DECODE_HEAD; 1109 1110 READ_BUF(4); 1111 remove->rm_namelen = be32_to_cpup(p++); 1112 READ_BUF(remove->rm_namelen); 1113 SAVEMEM(remove->rm_name, remove->rm_namelen); 1114 if ((status = check_filename(remove->rm_name, remove->rm_namelen))) 1115 return status; 1116 1117 DECODE_TAIL; 1118 } 1119 1120 static __be32 1121 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename) 1122 { 1123 DECODE_HEAD; 1124 1125 READ_BUF(4); 1126 rename->rn_snamelen = be32_to_cpup(p++); 1127 READ_BUF(rename->rn_snamelen); 1128 SAVEMEM(rename->rn_sname, rename->rn_snamelen); 1129 READ_BUF(4); 1130 rename->rn_tnamelen = be32_to_cpup(p++); 1131 READ_BUF(rename->rn_tnamelen); 1132 SAVEMEM(rename->rn_tname, rename->rn_tnamelen); 1133 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen))) 1134 return status; 1135 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen))) 1136 return status; 1137 1138 DECODE_TAIL; 1139 } 1140 1141 static __be32 1142 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid) 1143 { 1144 DECODE_HEAD; 1145 1146 if (argp->minorversion >= 1) 1147 return nfserr_notsupp; 1148 1149 READ_BUF(sizeof(clientid_t)); 1150 COPYMEM(clientid, sizeof(clientid_t)); 1151 1152 DECODE_TAIL; 1153 } 1154 1155 static __be32 1156 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp, 1157 struct nfsd4_secinfo *secinfo) 1158 { 1159 DECODE_HEAD; 1160 1161 READ_BUF(4); 1162 secinfo->si_namelen = be32_to_cpup(p++); 1163 READ_BUF(secinfo->si_namelen); 1164 SAVEMEM(secinfo->si_name, secinfo->si_namelen); 1165 status = check_filename(secinfo->si_name, secinfo->si_namelen); 1166 if (status) 1167 return status; 1168 DECODE_TAIL; 1169 } 1170 1171 static __be32 1172 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp, 1173 struct nfsd4_secinfo_no_name *sin) 1174 { 1175 DECODE_HEAD; 1176 1177 READ_BUF(4); 1178 sin->sin_style = be32_to_cpup(p++); 1179 DECODE_TAIL; 1180 } 1181 1182 static __be32 1183 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr) 1184 { 1185 __be32 status; 1186 1187 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid); 1188 if (status) 1189 return status; 1190 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, 1191 &setattr->sa_acl, &setattr->sa_label, NULL); 1192 } 1193 1194 static __be32 1195 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid) 1196 { 1197 DECODE_HEAD; 1198 1199 if (argp->minorversion >= 1) 1200 return nfserr_notsupp; 1201 1202 READ_BUF(NFS4_VERIFIER_SIZE); 1203 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE); 1204 1205 status = nfsd4_decode_opaque(argp, &setclientid->se_name); 1206 if (status) 1207 return nfserr_bad_xdr; 1208 READ_BUF(8); 1209 setclientid->se_callback_prog = be32_to_cpup(p++); 1210 setclientid->se_callback_netid_len = be32_to_cpup(p++); 1211 READ_BUF(setclientid->se_callback_netid_len); 1212 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len); 1213 READ_BUF(4); 1214 setclientid->se_callback_addr_len = be32_to_cpup(p++); 1215 1216 READ_BUF(setclientid->se_callback_addr_len); 1217 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len); 1218 READ_BUF(4); 1219 setclientid->se_callback_ident = be32_to_cpup(p++); 1220 1221 DECODE_TAIL; 1222 } 1223 1224 static __be32 1225 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c) 1226 { 1227 DECODE_HEAD; 1228 1229 if (argp->minorversion >= 1) 1230 return nfserr_notsupp; 1231 1232 READ_BUF(8 + NFS4_VERIFIER_SIZE); 1233 COPYMEM(&scd_c->sc_clientid, 8); 1234 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE); 1235 1236 DECODE_TAIL; 1237 } 1238 1239 /* Also used for NVERIFY */ 1240 static __be32 1241 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify) 1242 { 1243 DECODE_HEAD; 1244 1245 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval))) 1246 goto out; 1247 1248 /* For convenience's sake, we compare raw xdr'd attributes in 1249 * nfsd4_proc_verify */ 1250 1251 READ_BUF(4); 1252 verify->ve_attrlen = be32_to_cpup(p++); 1253 READ_BUF(verify->ve_attrlen); 1254 SAVEMEM(verify->ve_attrval, verify->ve_attrlen); 1255 1256 DECODE_TAIL; 1257 } 1258 1259 static __be32 1260 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) 1261 { 1262 int avail; 1263 int len; 1264 DECODE_HEAD; 1265 1266 status = nfsd4_decode_stateid(argp, &write->wr_stateid); 1267 if (status) 1268 return status; 1269 READ_BUF(16); 1270 p = xdr_decode_hyper(p, &write->wr_offset); 1271 write->wr_stable_how = be32_to_cpup(p++); 1272 if (write->wr_stable_how > NFS_FILE_SYNC) 1273 goto xdr_error; 1274 write->wr_buflen = be32_to_cpup(p++); 1275 1276 /* Sorry .. no magic macros for this.. * 1277 * READ_BUF(write->wr_buflen); 1278 * SAVEMEM(write->wr_buf, write->wr_buflen); 1279 */ 1280 avail = (char*)argp->end - (char*)argp->p; 1281 if (avail + argp->pagelen < write->wr_buflen) { 1282 dprintk("NFSD: xdr error (%s:%d)\n", 1283 __FILE__, __LINE__); 1284 goto xdr_error; 1285 } 1286 write->wr_head.iov_base = p; 1287 write->wr_head.iov_len = avail; 1288 write->wr_pagelist = argp->pagelist; 1289 1290 len = XDR_QUADLEN(write->wr_buflen) << 2; 1291 if (len >= avail) { 1292 int pages; 1293 1294 len -= avail; 1295 1296 pages = len >> PAGE_SHIFT; 1297 argp->pagelist += pages; 1298 argp->pagelen -= pages * PAGE_SIZE; 1299 len -= pages * PAGE_SIZE; 1300 1301 next_decode_page(argp); 1302 } 1303 argp->p += XDR_QUADLEN(len); 1304 1305 DECODE_TAIL; 1306 } 1307 1308 static __be32 1309 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner) 1310 { 1311 DECODE_HEAD; 1312 1313 if (argp->minorversion >= 1) 1314 return nfserr_notsupp; 1315 1316 READ_BUF(12); 1317 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t)); 1318 rlockowner->rl_owner.len = be32_to_cpup(p++); 1319 READ_BUF(rlockowner->rl_owner.len); 1320 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len); 1321 1322 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid)) 1323 return nfserr_inval; 1324 DECODE_TAIL; 1325 } 1326 1327 static __be32 1328 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp, 1329 struct nfsd4_exchange_id *exid) 1330 { 1331 int dummy, tmp; 1332 DECODE_HEAD; 1333 1334 READ_BUF(NFS4_VERIFIER_SIZE); 1335 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE); 1336 1337 status = nfsd4_decode_opaque(argp, &exid->clname); 1338 if (status) 1339 return nfserr_bad_xdr; 1340 1341 READ_BUF(4); 1342 exid->flags = be32_to_cpup(p++); 1343 1344 /* Ignore state_protect4_a */ 1345 READ_BUF(4); 1346 exid->spa_how = be32_to_cpup(p++); 1347 switch (exid->spa_how) { 1348 case SP4_NONE: 1349 break; 1350 case SP4_MACH_CRED: 1351 /* spo_must_enforce */ 1352 status = nfsd4_decode_bitmap(argp, 1353 exid->spo_must_enforce); 1354 if (status) 1355 goto out; 1356 /* spo_must_allow */ 1357 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow); 1358 if (status) 1359 goto out; 1360 break; 1361 case SP4_SSV: 1362 /* ssp_ops */ 1363 READ_BUF(4); 1364 dummy = be32_to_cpup(p++); 1365 READ_BUF(dummy * 4); 1366 p += dummy; 1367 1368 READ_BUF(4); 1369 dummy = be32_to_cpup(p++); 1370 READ_BUF(dummy * 4); 1371 p += dummy; 1372 1373 /* ssp_hash_algs<> */ 1374 READ_BUF(4); 1375 tmp = be32_to_cpup(p++); 1376 while (tmp--) { 1377 READ_BUF(4); 1378 dummy = be32_to_cpup(p++); 1379 READ_BUF(dummy); 1380 p += XDR_QUADLEN(dummy); 1381 } 1382 1383 /* ssp_encr_algs<> */ 1384 READ_BUF(4); 1385 tmp = be32_to_cpup(p++); 1386 while (tmp--) { 1387 READ_BUF(4); 1388 dummy = be32_to_cpup(p++); 1389 READ_BUF(dummy); 1390 p += XDR_QUADLEN(dummy); 1391 } 1392 1393 /* ignore ssp_window and ssp_num_gss_handles: */ 1394 READ_BUF(8); 1395 break; 1396 default: 1397 goto xdr_error; 1398 } 1399 1400 /* Ignore Implementation ID */ 1401 READ_BUF(4); /* nfs_impl_id4 array length */ 1402 dummy = be32_to_cpup(p++); 1403 1404 if (dummy > 1) 1405 goto xdr_error; 1406 1407 if (dummy == 1) { 1408 /* nii_domain */ 1409 READ_BUF(4); 1410 dummy = be32_to_cpup(p++); 1411 READ_BUF(dummy); 1412 p += XDR_QUADLEN(dummy); 1413 1414 /* nii_name */ 1415 READ_BUF(4); 1416 dummy = be32_to_cpup(p++); 1417 READ_BUF(dummy); 1418 p += XDR_QUADLEN(dummy); 1419 1420 /* nii_date */ 1421 READ_BUF(12); 1422 p += 3; 1423 } 1424 DECODE_TAIL; 1425 } 1426 1427 static __be32 1428 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, 1429 struct nfsd4_create_session *sess) 1430 { 1431 DECODE_HEAD; 1432 u32 dummy; 1433 1434 READ_BUF(16); 1435 COPYMEM(&sess->clientid, 8); 1436 sess->seqid = be32_to_cpup(p++); 1437 sess->flags = be32_to_cpup(p++); 1438 1439 /* Fore channel attrs */ 1440 READ_BUF(28); 1441 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */ 1442 sess->fore_channel.maxreq_sz = be32_to_cpup(p++); 1443 sess->fore_channel.maxresp_sz = be32_to_cpup(p++); 1444 sess->fore_channel.maxresp_cached = be32_to_cpup(p++); 1445 sess->fore_channel.maxops = be32_to_cpup(p++); 1446 sess->fore_channel.maxreqs = be32_to_cpup(p++); 1447 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++); 1448 if (sess->fore_channel.nr_rdma_attrs == 1) { 1449 READ_BUF(4); 1450 sess->fore_channel.rdma_attrs = be32_to_cpup(p++); 1451 } else if (sess->fore_channel.nr_rdma_attrs > 1) { 1452 dprintk("Too many fore channel attr bitmaps!\n"); 1453 goto xdr_error; 1454 } 1455 1456 /* Back channel attrs */ 1457 READ_BUF(28); 1458 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */ 1459 sess->back_channel.maxreq_sz = be32_to_cpup(p++); 1460 sess->back_channel.maxresp_sz = be32_to_cpup(p++); 1461 sess->back_channel.maxresp_cached = be32_to_cpup(p++); 1462 sess->back_channel.maxops = be32_to_cpup(p++); 1463 sess->back_channel.maxreqs = be32_to_cpup(p++); 1464 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++); 1465 if (sess->back_channel.nr_rdma_attrs == 1) { 1466 READ_BUF(4); 1467 sess->back_channel.rdma_attrs = be32_to_cpup(p++); 1468 } else if (sess->back_channel.nr_rdma_attrs > 1) { 1469 dprintk("Too many back channel attr bitmaps!\n"); 1470 goto xdr_error; 1471 } 1472 1473 READ_BUF(4); 1474 sess->callback_prog = be32_to_cpup(p++); 1475 nfsd4_decode_cb_sec(argp, &sess->cb_sec); 1476 DECODE_TAIL; 1477 } 1478 1479 static __be32 1480 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp, 1481 struct nfsd4_destroy_session *destroy_session) 1482 { 1483 DECODE_HEAD; 1484 READ_BUF(NFS4_MAX_SESSIONID_LEN); 1485 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN); 1486 1487 DECODE_TAIL; 1488 } 1489 1490 static __be32 1491 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp, 1492 struct nfsd4_free_stateid *free_stateid) 1493 { 1494 DECODE_HEAD; 1495 1496 READ_BUF(sizeof(stateid_t)); 1497 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++); 1498 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t)); 1499 1500 DECODE_TAIL; 1501 } 1502 1503 static __be32 1504 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp, 1505 struct nfsd4_sequence *seq) 1506 { 1507 DECODE_HEAD; 1508 1509 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); 1510 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN); 1511 seq->seqid = be32_to_cpup(p++); 1512 seq->slotid = be32_to_cpup(p++); 1513 seq->maxslots = be32_to_cpup(p++); 1514 seq->cachethis = be32_to_cpup(p++); 1515 1516 DECODE_TAIL; 1517 } 1518 1519 static __be32 1520 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid) 1521 { 1522 int i; 1523 __be32 *p, status; 1524 struct nfsd4_test_stateid_id *stateid; 1525 1526 READ_BUF(4); 1527 test_stateid->ts_num_ids = ntohl(*p++); 1528 1529 INIT_LIST_HEAD(&test_stateid->ts_stateid_list); 1530 1531 for (i = 0; i < test_stateid->ts_num_ids; i++) { 1532 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); 1533 if (!stateid) { 1534 status = nfserrno(-ENOMEM); 1535 goto out; 1536 } 1537 1538 INIT_LIST_HEAD(&stateid->ts_id_list); 1539 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); 1540 1541 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid); 1542 if (status) 1543 goto out; 1544 } 1545 1546 status = 0; 1547 out: 1548 return status; 1549 xdr_error: 1550 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__); 1551 status = nfserr_bad_xdr; 1552 goto out; 1553 } 1554 1555 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc) 1556 { 1557 DECODE_HEAD; 1558 1559 READ_BUF(8); 1560 COPYMEM(&dc->clientid, 8); 1561 1562 DECODE_TAIL; 1563 } 1564 1565 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc) 1566 { 1567 DECODE_HEAD; 1568 1569 READ_BUF(4); 1570 rc->rca_one_fs = be32_to_cpup(p++); 1571 1572 DECODE_TAIL; 1573 } 1574 1575 #ifdef CONFIG_NFSD_PNFS 1576 static __be32 1577 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp, 1578 struct nfsd4_getdeviceinfo *gdev) 1579 { 1580 DECODE_HEAD; 1581 u32 num, i; 1582 1583 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4); 1584 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid)); 1585 gdev->gd_layout_type = be32_to_cpup(p++); 1586 gdev->gd_maxcount = be32_to_cpup(p++); 1587 num = be32_to_cpup(p++); 1588 if (num) { 1589 if (num > 1000) 1590 goto xdr_error; 1591 READ_BUF(4 * num); 1592 gdev->gd_notify_types = be32_to_cpup(p++); 1593 for (i = 1; i < num; i++) { 1594 if (be32_to_cpup(p++)) { 1595 status = nfserr_inval; 1596 goto out; 1597 } 1598 } 1599 } 1600 DECODE_TAIL; 1601 } 1602 1603 static __be32 1604 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp, 1605 struct nfsd4_layoutget *lgp) 1606 { 1607 DECODE_HEAD; 1608 1609 READ_BUF(36); 1610 lgp->lg_signal = be32_to_cpup(p++); 1611 lgp->lg_layout_type = be32_to_cpup(p++); 1612 lgp->lg_seg.iomode = be32_to_cpup(p++); 1613 p = xdr_decode_hyper(p, &lgp->lg_seg.offset); 1614 p = xdr_decode_hyper(p, &lgp->lg_seg.length); 1615 p = xdr_decode_hyper(p, &lgp->lg_minlength); 1616 1617 status = nfsd4_decode_stateid(argp, &lgp->lg_sid); 1618 if (status) 1619 return status; 1620 1621 READ_BUF(4); 1622 lgp->lg_maxcount = be32_to_cpup(p++); 1623 1624 DECODE_TAIL; 1625 } 1626 1627 static __be32 1628 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp, 1629 struct nfsd4_layoutcommit *lcp) 1630 { 1631 DECODE_HEAD; 1632 u32 timechange; 1633 1634 READ_BUF(20); 1635 p = xdr_decode_hyper(p, &lcp->lc_seg.offset); 1636 p = xdr_decode_hyper(p, &lcp->lc_seg.length); 1637 lcp->lc_reclaim = be32_to_cpup(p++); 1638 1639 status = nfsd4_decode_stateid(argp, &lcp->lc_sid); 1640 if (status) 1641 return status; 1642 1643 READ_BUF(4); 1644 lcp->lc_newoffset = be32_to_cpup(p++); 1645 if (lcp->lc_newoffset) { 1646 READ_BUF(8); 1647 p = xdr_decode_hyper(p, &lcp->lc_last_wr); 1648 } else 1649 lcp->lc_last_wr = 0; 1650 READ_BUF(4); 1651 timechange = be32_to_cpup(p++); 1652 if (timechange) { 1653 status = nfsd4_decode_time(argp, &lcp->lc_mtime); 1654 if (status) 1655 return status; 1656 } else { 1657 lcp->lc_mtime.tv_nsec = UTIME_NOW; 1658 } 1659 READ_BUF(8); 1660 lcp->lc_layout_type = be32_to_cpup(p++); 1661 1662 /* 1663 * Save the layout update in XDR format and let the layout driver deal 1664 * with it later. 1665 */ 1666 lcp->lc_up_len = be32_to_cpup(p++); 1667 if (lcp->lc_up_len > 0) { 1668 READ_BUF(lcp->lc_up_len); 1669 READMEM(lcp->lc_up_layout, lcp->lc_up_len); 1670 } 1671 1672 DECODE_TAIL; 1673 } 1674 1675 static __be32 1676 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp, 1677 struct nfsd4_layoutreturn *lrp) 1678 { 1679 DECODE_HEAD; 1680 1681 READ_BUF(16); 1682 lrp->lr_reclaim = be32_to_cpup(p++); 1683 lrp->lr_layout_type = be32_to_cpup(p++); 1684 lrp->lr_seg.iomode = be32_to_cpup(p++); 1685 lrp->lr_return_type = be32_to_cpup(p++); 1686 if (lrp->lr_return_type == RETURN_FILE) { 1687 READ_BUF(16); 1688 p = xdr_decode_hyper(p, &lrp->lr_seg.offset); 1689 p = xdr_decode_hyper(p, &lrp->lr_seg.length); 1690 1691 status = nfsd4_decode_stateid(argp, &lrp->lr_sid); 1692 if (status) 1693 return status; 1694 1695 READ_BUF(4); 1696 lrp->lrf_body_len = be32_to_cpup(p++); 1697 if (lrp->lrf_body_len > 0) { 1698 READ_BUF(lrp->lrf_body_len); 1699 READMEM(lrp->lrf_body, lrp->lrf_body_len); 1700 } 1701 } else { 1702 lrp->lr_seg.offset = 0; 1703 lrp->lr_seg.length = NFS4_MAX_UINT64; 1704 } 1705 1706 DECODE_TAIL; 1707 } 1708 #endif /* CONFIG_NFSD_PNFS */ 1709 1710 static __be32 1711 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp, 1712 struct nfsd4_fallocate *fallocate) 1713 { 1714 DECODE_HEAD; 1715 1716 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid); 1717 if (status) 1718 return status; 1719 1720 READ_BUF(16); 1721 p = xdr_decode_hyper(p, &fallocate->falloc_offset); 1722 xdr_decode_hyper(p, &fallocate->falloc_length); 1723 1724 DECODE_TAIL; 1725 } 1726 1727 static __be32 1728 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone) 1729 { 1730 DECODE_HEAD; 1731 1732 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid); 1733 if (status) 1734 return status; 1735 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid); 1736 if (status) 1737 return status; 1738 1739 READ_BUF(8 + 8 + 8); 1740 p = xdr_decode_hyper(p, &clone->cl_src_pos); 1741 p = xdr_decode_hyper(p, &clone->cl_dst_pos); 1742 p = xdr_decode_hyper(p, &clone->cl_count); 1743 DECODE_TAIL; 1744 } 1745 1746 static __be32 1747 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy) 1748 { 1749 DECODE_HEAD; 1750 unsigned int tmp; 1751 1752 status = nfsd4_decode_stateid(argp, ©->cp_src_stateid); 1753 if (status) 1754 return status; 1755 status = nfsd4_decode_stateid(argp, ©->cp_dst_stateid); 1756 if (status) 1757 return status; 1758 1759 READ_BUF(8 + 8 + 8 + 4 + 4 + 4); 1760 p = xdr_decode_hyper(p, ©->cp_src_pos); 1761 p = xdr_decode_hyper(p, ©->cp_dst_pos); 1762 p = xdr_decode_hyper(p, ©->cp_count); 1763 p++; /* ca_consecutive: we always do consecutive copies */ 1764 copy->cp_synchronous = be32_to_cpup(p++); 1765 tmp = be32_to_cpup(p); /* Source server list not supported */ 1766 1767 DECODE_TAIL; 1768 } 1769 1770 static __be32 1771 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek) 1772 { 1773 DECODE_HEAD; 1774 1775 status = nfsd4_decode_stateid(argp, &seek->seek_stateid); 1776 if (status) 1777 return status; 1778 1779 READ_BUF(8 + 4); 1780 p = xdr_decode_hyper(p, &seek->seek_offset); 1781 seek->seek_whence = be32_to_cpup(p); 1782 1783 DECODE_TAIL; 1784 } 1785 1786 static __be32 1787 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p) 1788 { 1789 return nfs_ok; 1790 } 1791 1792 static __be32 1793 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p) 1794 { 1795 return nfserr_notsupp; 1796 } 1797 1798 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *); 1799 1800 static const nfsd4_dec nfsd4_dec_ops[] = { 1801 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access, 1802 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close, 1803 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit, 1804 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create, 1805 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp, 1806 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn, 1807 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr, 1808 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop, 1809 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link, 1810 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock, 1811 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt, 1812 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku, 1813 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup, 1814 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop, 1815 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify, 1816 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open, 1817 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp, 1818 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm, 1819 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade, 1820 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh, 1821 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh, 1822 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop, 1823 [OP_READ] = (nfsd4_dec)nfsd4_decode_read, 1824 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir, 1825 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop, 1826 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove, 1827 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename, 1828 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew, 1829 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop, 1830 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop, 1831 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo, 1832 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr, 1833 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid, 1834 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm, 1835 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify, 1836 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write, 1837 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner, 1838 1839 /* new operations for NFSv4.1 */ 1840 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl, 1841 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session, 1842 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id, 1843 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session, 1844 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session, 1845 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid, 1846 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 1847 #ifdef CONFIG_NFSD_PNFS 1848 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo, 1849 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 1850 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit, 1851 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget, 1852 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn, 1853 #else 1854 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp, 1855 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 1856 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp, 1857 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp, 1858 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp, 1859 #endif 1860 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name, 1861 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence, 1862 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp, 1863 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid, 1864 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 1865 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid, 1866 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete, 1867 1868 /* new operations for NFSv4.2 */ 1869 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 1870 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy, 1871 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp, 1872 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 1873 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp, 1874 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp, 1875 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp, 1876 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp, 1877 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp, 1878 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp, 1879 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek, 1880 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp, 1881 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone, 1882 }; 1883 1884 static inline bool 1885 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op) 1886 { 1887 if (op->opnum < FIRST_NFS4_OP) 1888 return false; 1889 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP) 1890 return false; 1891 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP) 1892 return false; 1893 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP) 1894 return false; 1895 return true; 1896 } 1897 1898 static __be32 1899 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 1900 { 1901 DECODE_HEAD; 1902 struct nfsd4_op *op; 1903 bool cachethis = false; 1904 int auth_slack= argp->rqstp->rq_auth_slack; 1905 int max_reply = auth_slack + 8; /* opcnt, status */ 1906 int readcount = 0; 1907 int readbytes = 0; 1908 int i; 1909 1910 READ_BUF(4); 1911 argp->taglen = be32_to_cpup(p++); 1912 READ_BUF(argp->taglen); 1913 SAVEMEM(argp->tag, argp->taglen); 1914 READ_BUF(8); 1915 argp->minorversion = be32_to_cpup(p++); 1916 argp->opcnt = be32_to_cpup(p++); 1917 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2); 1918 1919 if (argp->taglen > NFSD4_MAX_TAGLEN) 1920 goto xdr_error; 1921 /* 1922 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS 1923 * here, so we return success at the xdr level so that 1924 * nfsd4_proc can handle this is an NFS-level error. 1925 */ 1926 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND) 1927 return 0; 1928 1929 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { 1930 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); 1931 if (!argp->ops) { 1932 argp->ops = argp->iops; 1933 dprintk("nfsd: couldn't allocate room for COMPOUND\n"); 1934 goto xdr_error; 1935 } 1936 } 1937 1938 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 1939 argp->opcnt = 0; 1940 1941 for (i = 0; i < argp->opcnt; i++) { 1942 op = &argp->ops[i]; 1943 op->replay = NULL; 1944 1945 READ_BUF(4); 1946 op->opnum = be32_to_cpup(p++); 1947 1948 if (nfsd4_opnum_in_range(argp, op)) 1949 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u); 1950 else { 1951 op->opnum = OP_ILLEGAL; 1952 op->status = nfserr_op_illegal; 1953 } 1954 op->opdesc = OPDESC(op); 1955 /* 1956 * We'll try to cache the result in the DRC if any one 1957 * op in the compound wants to be cached: 1958 */ 1959 cachethis |= nfsd4_cache_this_op(op); 1960 1961 if (op->opnum == OP_READ) { 1962 readcount++; 1963 readbytes += nfsd4_max_reply(argp->rqstp, op); 1964 } else 1965 max_reply += nfsd4_max_reply(argp->rqstp, op); 1966 /* 1967 * OP_LOCK and OP_LOCKT may return a conflicting lock. 1968 * (Special case because it will just skip encoding this 1969 * if it runs out of xdr buffer space, and it is the only 1970 * operation that behaves this way.) 1971 */ 1972 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT) 1973 max_reply += NFS4_OPAQUE_LIMIT; 1974 1975 if (op->status) { 1976 argp->opcnt = i+1; 1977 break; 1978 } 1979 } 1980 /* Sessions make the DRC unnecessary: */ 1981 if (argp->minorversion) 1982 cachethis = false; 1983 svc_reserve(argp->rqstp, max_reply + readbytes); 1984 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE; 1985 1986 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack) 1987 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags); 1988 1989 DECODE_TAIL; 1990 } 1991 1992 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode, 1993 struct svc_export *exp) 1994 { 1995 if (exp->ex_flags & NFSEXP_V4ROOT) { 1996 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time)); 1997 *p++ = 0; 1998 } else if (IS_I_VERSION(inode)) { 1999 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode)); 2000 } else { 2001 *p++ = cpu_to_be32(stat->ctime.tv_sec); 2002 *p++ = cpu_to_be32(stat->ctime.tv_nsec); 2003 } 2004 return p; 2005 } 2006 2007 /* 2008 * ctime (in NFSv4, time_metadata) is not writeable, and the client 2009 * doesn't really care what resolution could theoretically be stored by 2010 * the filesystem. 2011 * 2012 * The client cares how close together changes can be while still 2013 * guaranteeing ctime changes. For most filesystems (which have 2014 * timestamps with nanosecond fields) that is limited by the resolution 2015 * of the time returned from current_time() (which I'm assuming to be 2016 * 1/HZ). 2017 */ 2018 static __be32 *encode_time_delta(__be32 *p, struct inode *inode) 2019 { 2020 struct timespec ts; 2021 u32 ns; 2022 2023 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran); 2024 ts = ns_to_timespec(ns); 2025 2026 p = xdr_encode_hyper(p, ts.tv_sec); 2027 *p++ = cpu_to_be32(ts.tv_nsec); 2028 2029 return p; 2030 } 2031 2032 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c) 2033 { 2034 *p++ = cpu_to_be32(c->atomic); 2035 if (c->change_supported) { 2036 p = xdr_encode_hyper(p, c->before_change); 2037 p = xdr_encode_hyper(p, c->after_change); 2038 } else { 2039 *p++ = cpu_to_be32(c->before_ctime_sec); 2040 *p++ = cpu_to_be32(c->before_ctime_nsec); 2041 *p++ = cpu_to_be32(c->after_ctime_sec); 2042 *p++ = cpu_to_be32(c->after_ctime_nsec); 2043 } 2044 return p; 2045 } 2046 2047 /* Encode as an array of strings the string given with components 2048 * separated @sep, escaped with esc_enter and esc_exit. 2049 */ 2050 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep, 2051 char *components, char esc_enter, 2052 char esc_exit) 2053 { 2054 __be32 *p; 2055 __be32 pathlen; 2056 int pathlen_offset; 2057 int strlen, count=0; 2058 char *str, *end, *next; 2059 2060 dprintk("nfsd4_encode_components(%s)\n", components); 2061 2062 pathlen_offset = xdr->buf->len; 2063 p = xdr_reserve_space(xdr, 4); 2064 if (!p) 2065 return nfserr_resource; 2066 p++; /* We will fill this in with @count later */ 2067 2068 end = str = components; 2069 while (*end) { 2070 bool found_esc = false; 2071 2072 /* try to parse as esc_start, ..., esc_end, sep */ 2073 if (*str == esc_enter) { 2074 for (; *end && (*end != esc_exit); end++) 2075 /* find esc_exit or end of string */; 2076 next = end + 1; 2077 if (*end && (!*next || *next == sep)) { 2078 str++; 2079 found_esc = true; 2080 } 2081 } 2082 2083 if (!found_esc) 2084 for (; *end && (*end != sep); end++) 2085 /* find sep or end of string */; 2086 2087 strlen = end - str; 2088 if (strlen) { 2089 p = xdr_reserve_space(xdr, strlen + 4); 2090 if (!p) 2091 return nfserr_resource; 2092 p = xdr_encode_opaque(p, str, strlen); 2093 count++; 2094 } 2095 else 2096 end++; 2097 if (found_esc) 2098 end = next; 2099 2100 str = end; 2101 } 2102 pathlen = htonl(count); 2103 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4); 2104 return 0; 2105 } 2106 2107 /* Encode as an array of strings the string given with components 2108 * separated @sep. 2109 */ 2110 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep, 2111 char *components) 2112 { 2113 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0); 2114 } 2115 2116 /* 2117 * encode a location element of a fs_locations structure 2118 */ 2119 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr, 2120 struct nfsd4_fs_location *location) 2121 { 2122 __be32 status; 2123 2124 status = nfsd4_encode_components_esc(xdr, ':', location->hosts, 2125 '[', ']'); 2126 if (status) 2127 return status; 2128 status = nfsd4_encode_components(xdr, '/', location->path); 2129 if (status) 2130 return status; 2131 return 0; 2132 } 2133 2134 /* 2135 * Encode a path in RFC3530 'pathname4' format 2136 */ 2137 static __be32 nfsd4_encode_path(struct xdr_stream *xdr, 2138 const struct path *root, 2139 const struct path *path) 2140 { 2141 struct path cur = *path; 2142 __be32 *p; 2143 struct dentry **components = NULL; 2144 unsigned int ncomponents = 0; 2145 __be32 err = nfserr_jukebox; 2146 2147 dprintk("nfsd4_encode_components("); 2148 2149 path_get(&cur); 2150 /* First walk the path up to the nfsd root, and store the 2151 * dentries/path components in an array. 2152 */ 2153 for (;;) { 2154 if (path_equal(&cur, root)) 2155 break; 2156 if (cur.dentry == cur.mnt->mnt_root) { 2157 if (follow_up(&cur)) 2158 continue; 2159 goto out_free; 2160 } 2161 if ((ncomponents & 15) == 0) { 2162 struct dentry **new; 2163 new = krealloc(components, 2164 sizeof(*new) * (ncomponents + 16), 2165 GFP_KERNEL); 2166 if (!new) 2167 goto out_free; 2168 components = new; 2169 } 2170 components[ncomponents++] = cur.dentry; 2171 cur.dentry = dget_parent(cur.dentry); 2172 } 2173 err = nfserr_resource; 2174 p = xdr_reserve_space(xdr, 4); 2175 if (!p) 2176 goto out_free; 2177 *p++ = cpu_to_be32(ncomponents); 2178 2179 while (ncomponents) { 2180 struct dentry *dentry = components[ncomponents - 1]; 2181 unsigned int len; 2182 2183 spin_lock(&dentry->d_lock); 2184 len = dentry->d_name.len; 2185 p = xdr_reserve_space(xdr, len + 4); 2186 if (!p) { 2187 spin_unlock(&dentry->d_lock); 2188 goto out_free; 2189 } 2190 p = xdr_encode_opaque(p, dentry->d_name.name, len); 2191 dprintk("/%pd", dentry); 2192 spin_unlock(&dentry->d_lock); 2193 dput(dentry); 2194 ncomponents--; 2195 } 2196 2197 err = 0; 2198 out_free: 2199 dprintk(")\n"); 2200 while (ncomponents) 2201 dput(components[--ncomponents]); 2202 kfree(components); 2203 path_put(&cur); 2204 return err; 2205 } 2206 2207 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr, 2208 struct svc_rqst *rqstp, const struct path *path) 2209 { 2210 struct svc_export *exp_ps; 2211 __be32 res; 2212 2213 exp_ps = rqst_find_fsidzero_export(rqstp); 2214 if (IS_ERR(exp_ps)) 2215 return nfserrno(PTR_ERR(exp_ps)); 2216 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path); 2217 exp_put(exp_ps); 2218 return res; 2219 } 2220 2221 /* 2222 * encode a fs_locations structure 2223 */ 2224 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr, 2225 struct svc_rqst *rqstp, struct svc_export *exp) 2226 { 2227 __be32 status; 2228 int i; 2229 __be32 *p; 2230 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; 2231 2232 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path); 2233 if (status) 2234 return status; 2235 p = xdr_reserve_space(xdr, 4); 2236 if (!p) 2237 return nfserr_resource; 2238 *p++ = cpu_to_be32(fslocs->locations_count); 2239 for (i=0; i<fslocs->locations_count; i++) { 2240 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]); 2241 if (status) 2242 return status; 2243 } 2244 return 0; 2245 } 2246 2247 static u32 nfs4_file_type(umode_t mode) 2248 { 2249 switch (mode & S_IFMT) { 2250 case S_IFIFO: return NF4FIFO; 2251 case S_IFCHR: return NF4CHR; 2252 case S_IFDIR: return NF4DIR; 2253 case S_IFBLK: return NF4BLK; 2254 case S_IFLNK: return NF4LNK; 2255 case S_IFREG: return NF4REG; 2256 case S_IFSOCK: return NF4SOCK; 2257 default: return NF4BAD; 2258 }; 2259 } 2260 2261 static inline __be32 2262 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2263 struct nfs4_ace *ace) 2264 { 2265 if (ace->whotype != NFS4_ACL_WHO_NAMED) 2266 return nfs4_acl_write_who(xdr, ace->whotype); 2267 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 2268 return nfsd4_encode_group(xdr, rqstp, ace->who_gid); 2269 else 2270 return nfsd4_encode_user(xdr, rqstp, ace->who_uid); 2271 } 2272 2273 static inline __be32 2274 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types) 2275 { 2276 __be32 *p; 2277 unsigned long i = hweight_long(layout_types); 2278 2279 p = xdr_reserve_space(xdr, 4 + 4 * i); 2280 if (!p) 2281 return nfserr_resource; 2282 2283 *p++ = cpu_to_be32(i); 2284 2285 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 2286 if (layout_types & (1 << i)) 2287 *p++ = cpu_to_be32(i); 2288 2289 return 0; 2290 } 2291 2292 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ 2293 FATTR4_WORD0_RDATTR_ERROR) 2294 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID 2295 #define WORD2_ABSENT_FS_ATTRS 0 2296 2297 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2298 static inline __be32 2299 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2300 void *context, int len) 2301 { 2302 __be32 *p; 2303 2304 p = xdr_reserve_space(xdr, len + 4 + 4 + 4); 2305 if (!p) 2306 return nfserr_resource; 2307 2308 /* 2309 * For now we use a 0 here to indicate the null translation; in 2310 * the future we may place a call to translation code here. 2311 */ 2312 *p++ = cpu_to_be32(0); /* lfs */ 2313 *p++ = cpu_to_be32(0); /* pi */ 2314 p = xdr_encode_opaque(p, context, len); 2315 return 0; 2316 } 2317 #else 2318 static inline __be32 2319 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2320 void *context, int len) 2321 { return 0; } 2322 #endif 2323 2324 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err) 2325 { 2326 /* As per referral draft: */ 2327 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || 2328 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { 2329 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || 2330 *bmval0 & FATTR4_WORD0_FS_LOCATIONS) 2331 *rdattr_err = NFSERR_MOVED; 2332 else 2333 return nfserr_moved; 2334 } 2335 *bmval0 &= WORD0_ABSENT_FS_ATTRS; 2336 *bmval1 &= WORD1_ABSENT_FS_ATTRS; 2337 *bmval2 &= WORD2_ABSENT_FS_ATTRS; 2338 return 0; 2339 } 2340 2341 2342 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat) 2343 { 2344 struct path path = exp->ex_path; 2345 int err; 2346 2347 path_get(&path); 2348 while (follow_up(&path)) { 2349 if (path.dentry != path.mnt->mnt_root) 2350 break; 2351 } 2352 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2353 path_put(&path); 2354 return err; 2355 } 2356 2357 static __be32 2358 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2) 2359 { 2360 __be32 *p; 2361 2362 if (bmval2) { 2363 p = xdr_reserve_space(xdr, 16); 2364 if (!p) 2365 goto out_resource; 2366 *p++ = cpu_to_be32(3); 2367 *p++ = cpu_to_be32(bmval0); 2368 *p++ = cpu_to_be32(bmval1); 2369 *p++ = cpu_to_be32(bmval2); 2370 } else if (bmval1) { 2371 p = xdr_reserve_space(xdr, 12); 2372 if (!p) 2373 goto out_resource; 2374 *p++ = cpu_to_be32(2); 2375 *p++ = cpu_to_be32(bmval0); 2376 *p++ = cpu_to_be32(bmval1); 2377 } else { 2378 p = xdr_reserve_space(xdr, 8); 2379 if (!p) 2380 goto out_resource; 2381 *p++ = cpu_to_be32(1); 2382 *p++ = cpu_to_be32(bmval0); 2383 } 2384 2385 return 0; 2386 out_resource: 2387 return nfserr_resource; 2388 } 2389 2390 /* 2391 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 2392 * ourselves. 2393 */ 2394 static __be32 2395 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, 2396 struct svc_export *exp, 2397 struct dentry *dentry, u32 *bmval, 2398 struct svc_rqst *rqstp, int ignore_crossmnt) 2399 { 2400 u32 bmval0 = bmval[0]; 2401 u32 bmval1 = bmval[1]; 2402 u32 bmval2 = bmval[2]; 2403 struct kstat stat; 2404 struct svc_fh *tempfh = NULL; 2405 struct kstatfs statfs; 2406 __be32 *p; 2407 int starting_len = xdr->buf->len; 2408 int attrlen_offset; 2409 __be32 attrlen; 2410 u32 dummy; 2411 u64 dummy64; 2412 u32 rdattr_err = 0; 2413 __be32 status; 2414 int err; 2415 struct nfs4_acl *acl = NULL; 2416 void *context = NULL; 2417 int contextlen; 2418 bool contextsupport = false; 2419 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2420 u32 minorversion = resp->cstate.minorversion; 2421 struct path path = { 2422 .mnt = exp->ex_path.mnt, 2423 .dentry = dentry, 2424 }; 2425 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2426 2427 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); 2428 BUG_ON(!nfsd_attrs_supported(minorversion, bmval)); 2429 2430 if (exp->ex_fslocs.migrated) { 2431 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err); 2432 if (status) 2433 goto out; 2434 } 2435 2436 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2437 if (err) 2438 goto out_nfserr; 2439 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE | 2440 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || 2441 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 2442 FATTR4_WORD1_SPACE_TOTAL))) { 2443 err = vfs_statfs(&path, &statfs); 2444 if (err) 2445 goto out_nfserr; 2446 } 2447 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { 2448 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); 2449 status = nfserr_jukebox; 2450 if (!tempfh) 2451 goto out; 2452 fh_init(tempfh, NFS4_FHSIZE); 2453 status = fh_compose(tempfh, exp, dentry, NULL); 2454 if (status) 2455 goto out; 2456 fhp = tempfh; 2457 } 2458 if (bmval0 & FATTR4_WORD0_ACL) { 2459 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); 2460 if (err == -EOPNOTSUPP) 2461 bmval0 &= ~FATTR4_WORD0_ACL; 2462 else if (err == -EINVAL) { 2463 status = nfserr_attrnotsupp; 2464 goto out; 2465 } else if (err != 0) 2466 goto out_nfserr; 2467 } 2468 2469 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2470 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) || 2471 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2472 if (exp->ex_flags & NFSEXP_SECURITY_LABEL) 2473 err = security_inode_getsecctx(d_inode(dentry), 2474 &context, &contextlen); 2475 else 2476 err = -EOPNOTSUPP; 2477 contextsupport = (err == 0); 2478 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2479 if (err == -EOPNOTSUPP) 2480 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL; 2481 else if (err) 2482 goto out_nfserr; 2483 } 2484 } 2485 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2486 2487 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2); 2488 if (status) 2489 goto out; 2490 2491 attrlen_offset = xdr->buf->len; 2492 p = xdr_reserve_space(xdr, 4); 2493 if (!p) 2494 goto out_resource; 2495 p++; /* to be backfilled later */ 2496 2497 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2498 u32 supp[3]; 2499 2500 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2501 2502 if (!IS_POSIXACL(dentry->d_inode)) 2503 supp[0] &= ~FATTR4_WORD0_ACL; 2504 if (!contextsupport) 2505 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2506 if (!supp[2]) { 2507 p = xdr_reserve_space(xdr, 12); 2508 if (!p) 2509 goto out_resource; 2510 *p++ = cpu_to_be32(2); 2511 *p++ = cpu_to_be32(supp[0]); 2512 *p++ = cpu_to_be32(supp[1]); 2513 } else { 2514 p = xdr_reserve_space(xdr, 16); 2515 if (!p) 2516 goto out_resource; 2517 *p++ = cpu_to_be32(3); 2518 *p++ = cpu_to_be32(supp[0]); 2519 *p++ = cpu_to_be32(supp[1]); 2520 *p++ = cpu_to_be32(supp[2]); 2521 } 2522 } 2523 if (bmval0 & FATTR4_WORD0_TYPE) { 2524 p = xdr_reserve_space(xdr, 4); 2525 if (!p) 2526 goto out_resource; 2527 dummy = nfs4_file_type(stat.mode); 2528 if (dummy == NF4BAD) { 2529 status = nfserr_serverfault; 2530 goto out; 2531 } 2532 *p++ = cpu_to_be32(dummy); 2533 } 2534 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { 2535 p = xdr_reserve_space(xdr, 4); 2536 if (!p) 2537 goto out_resource; 2538 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 2539 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT); 2540 else 2541 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT| 2542 NFS4_FH_VOL_RENAME); 2543 } 2544 if (bmval0 & FATTR4_WORD0_CHANGE) { 2545 p = xdr_reserve_space(xdr, 8); 2546 if (!p) 2547 goto out_resource; 2548 p = encode_change(p, &stat, d_inode(dentry), exp); 2549 } 2550 if (bmval0 & FATTR4_WORD0_SIZE) { 2551 p = xdr_reserve_space(xdr, 8); 2552 if (!p) 2553 goto out_resource; 2554 p = xdr_encode_hyper(p, stat.size); 2555 } 2556 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { 2557 p = xdr_reserve_space(xdr, 4); 2558 if (!p) 2559 goto out_resource; 2560 *p++ = cpu_to_be32(1); 2561 } 2562 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { 2563 p = xdr_reserve_space(xdr, 4); 2564 if (!p) 2565 goto out_resource; 2566 *p++ = cpu_to_be32(1); 2567 } 2568 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { 2569 p = xdr_reserve_space(xdr, 4); 2570 if (!p) 2571 goto out_resource; 2572 *p++ = cpu_to_be32(0); 2573 } 2574 if (bmval0 & FATTR4_WORD0_FSID) { 2575 p = xdr_reserve_space(xdr, 16); 2576 if (!p) 2577 goto out_resource; 2578 if (exp->ex_fslocs.migrated) { 2579 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR); 2580 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR); 2581 } else switch(fsid_source(fhp)) { 2582 case FSIDSOURCE_FSID: 2583 p = xdr_encode_hyper(p, (u64)exp->ex_fsid); 2584 p = xdr_encode_hyper(p, (u64)0); 2585 break; 2586 case FSIDSOURCE_DEV: 2587 *p++ = cpu_to_be32(0); 2588 *p++ = cpu_to_be32(MAJOR(stat.dev)); 2589 *p++ = cpu_to_be32(0); 2590 *p++ = cpu_to_be32(MINOR(stat.dev)); 2591 break; 2592 case FSIDSOURCE_UUID: 2593 p = xdr_encode_opaque_fixed(p, exp->ex_uuid, 2594 EX_UUID_LEN); 2595 break; 2596 } 2597 } 2598 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { 2599 p = xdr_reserve_space(xdr, 4); 2600 if (!p) 2601 goto out_resource; 2602 *p++ = cpu_to_be32(0); 2603 } 2604 if (bmval0 & FATTR4_WORD0_LEASE_TIME) { 2605 p = xdr_reserve_space(xdr, 4); 2606 if (!p) 2607 goto out_resource; 2608 *p++ = cpu_to_be32(nn->nfsd4_lease); 2609 } 2610 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { 2611 p = xdr_reserve_space(xdr, 4); 2612 if (!p) 2613 goto out_resource; 2614 *p++ = cpu_to_be32(rdattr_err); 2615 } 2616 if (bmval0 & FATTR4_WORD0_ACL) { 2617 struct nfs4_ace *ace; 2618 2619 if (acl == NULL) { 2620 p = xdr_reserve_space(xdr, 4); 2621 if (!p) 2622 goto out_resource; 2623 2624 *p++ = cpu_to_be32(0); 2625 goto out_acl; 2626 } 2627 p = xdr_reserve_space(xdr, 4); 2628 if (!p) 2629 goto out_resource; 2630 *p++ = cpu_to_be32(acl->naces); 2631 2632 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 2633 p = xdr_reserve_space(xdr, 4*3); 2634 if (!p) 2635 goto out_resource; 2636 *p++ = cpu_to_be32(ace->type); 2637 *p++ = cpu_to_be32(ace->flag); 2638 *p++ = cpu_to_be32(ace->access_mask & 2639 NFS4_ACE_MASK_ALL); 2640 status = nfsd4_encode_aclname(xdr, rqstp, ace); 2641 if (status) 2642 goto out; 2643 } 2644 } 2645 out_acl: 2646 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { 2647 p = xdr_reserve_space(xdr, 4); 2648 if (!p) 2649 goto out_resource; 2650 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ? 2651 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); 2652 } 2653 if (bmval0 & FATTR4_WORD0_CANSETTIME) { 2654 p = xdr_reserve_space(xdr, 4); 2655 if (!p) 2656 goto out_resource; 2657 *p++ = cpu_to_be32(1); 2658 } 2659 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { 2660 p = xdr_reserve_space(xdr, 4); 2661 if (!p) 2662 goto out_resource; 2663 *p++ = cpu_to_be32(0); 2664 } 2665 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { 2666 p = xdr_reserve_space(xdr, 4); 2667 if (!p) 2668 goto out_resource; 2669 *p++ = cpu_to_be32(1); 2670 } 2671 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { 2672 p = xdr_reserve_space(xdr, 4); 2673 if (!p) 2674 goto out_resource; 2675 *p++ = cpu_to_be32(1); 2676 } 2677 if (bmval0 & FATTR4_WORD0_FILEHANDLE) { 2678 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4); 2679 if (!p) 2680 goto out_resource; 2681 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, 2682 fhp->fh_handle.fh_size); 2683 } 2684 if (bmval0 & FATTR4_WORD0_FILEID) { 2685 p = xdr_reserve_space(xdr, 8); 2686 if (!p) 2687 goto out_resource; 2688 p = xdr_encode_hyper(p, stat.ino); 2689 } 2690 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { 2691 p = xdr_reserve_space(xdr, 8); 2692 if (!p) 2693 goto out_resource; 2694 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 2695 } 2696 if (bmval0 & FATTR4_WORD0_FILES_FREE) { 2697 p = xdr_reserve_space(xdr, 8); 2698 if (!p) 2699 goto out_resource; 2700 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 2701 } 2702 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { 2703 p = xdr_reserve_space(xdr, 8); 2704 if (!p) 2705 goto out_resource; 2706 p = xdr_encode_hyper(p, (u64) statfs.f_files); 2707 } 2708 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) { 2709 status = nfsd4_encode_fs_locations(xdr, rqstp, exp); 2710 if (status) 2711 goto out; 2712 } 2713 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { 2714 p = xdr_reserve_space(xdr, 4); 2715 if (!p) 2716 goto out_resource; 2717 *p++ = cpu_to_be32(1); 2718 } 2719 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { 2720 p = xdr_reserve_space(xdr, 8); 2721 if (!p) 2722 goto out_resource; 2723 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes); 2724 } 2725 if (bmval0 & FATTR4_WORD0_MAXLINK) { 2726 p = xdr_reserve_space(xdr, 4); 2727 if (!p) 2728 goto out_resource; 2729 *p++ = cpu_to_be32(255); 2730 } 2731 if (bmval0 & FATTR4_WORD0_MAXNAME) { 2732 p = xdr_reserve_space(xdr, 4); 2733 if (!p) 2734 goto out_resource; 2735 *p++ = cpu_to_be32(statfs.f_namelen); 2736 } 2737 if (bmval0 & FATTR4_WORD0_MAXREAD) { 2738 p = xdr_reserve_space(xdr, 8); 2739 if (!p) 2740 goto out_resource; 2741 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 2742 } 2743 if (bmval0 & FATTR4_WORD0_MAXWRITE) { 2744 p = xdr_reserve_space(xdr, 8); 2745 if (!p) 2746 goto out_resource; 2747 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 2748 } 2749 if (bmval1 & FATTR4_WORD1_MODE) { 2750 p = xdr_reserve_space(xdr, 4); 2751 if (!p) 2752 goto out_resource; 2753 *p++ = cpu_to_be32(stat.mode & S_IALLUGO); 2754 } 2755 if (bmval1 & FATTR4_WORD1_NO_TRUNC) { 2756 p = xdr_reserve_space(xdr, 4); 2757 if (!p) 2758 goto out_resource; 2759 *p++ = cpu_to_be32(1); 2760 } 2761 if (bmval1 & FATTR4_WORD1_NUMLINKS) { 2762 p = xdr_reserve_space(xdr, 4); 2763 if (!p) 2764 goto out_resource; 2765 *p++ = cpu_to_be32(stat.nlink); 2766 } 2767 if (bmval1 & FATTR4_WORD1_OWNER) { 2768 status = nfsd4_encode_user(xdr, rqstp, stat.uid); 2769 if (status) 2770 goto out; 2771 } 2772 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { 2773 status = nfsd4_encode_group(xdr, rqstp, stat.gid); 2774 if (status) 2775 goto out; 2776 } 2777 if (bmval1 & FATTR4_WORD1_RAWDEV) { 2778 p = xdr_reserve_space(xdr, 8); 2779 if (!p) 2780 goto out_resource; 2781 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev)); 2782 *p++ = cpu_to_be32((u32) MINOR(stat.rdev)); 2783 } 2784 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { 2785 p = xdr_reserve_space(xdr, 8); 2786 if (!p) 2787 goto out_resource; 2788 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; 2789 p = xdr_encode_hyper(p, dummy64); 2790 } 2791 if (bmval1 & FATTR4_WORD1_SPACE_FREE) { 2792 p = xdr_reserve_space(xdr, 8); 2793 if (!p) 2794 goto out_resource; 2795 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; 2796 p = xdr_encode_hyper(p, dummy64); 2797 } 2798 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { 2799 p = xdr_reserve_space(xdr, 8); 2800 if (!p) 2801 goto out_resource; 2802 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; 2803 p = xdr_encode_hyper(p, dummy64); 2804 } 2805 if (bmval1 & FATTR4_WORD1_SPACE_USED) { 2806 p = xdr_reserve_space(xdr, 8); 2807 if (!p) 2808 goto out_resource; 2809 dummy64 = (u64)stat.blocks << 9; 2810 p = xdr_encode_hyper(p, dummy64); 2811 } 2812 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { 2813 p = xdr_reserve_space(xdr, 12); 2814 if (!p) 2815 goto out_resource; 2816 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec); 2817 *p++ = cpu_to_be32(stat.atime.tv_nsec); 2818 } 2819 if (bmval1 & FATTR4_WORD1_TIME_DELTA) { 2820 p = xdr_reserve_space(xdr, 12); 2821 if (!p) 2822 goto out_resource; 2823 p = encode_time_delta(p, d_inode(dentry)); 2824 } 2825 if (bmval1 & FATTR4_WORD1_TIME_METADATA) { 2826 p = xdr_reserve_space(xdr, 12); 2827 if (!p) 2828 goto out_resource; 2829 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec); 2830 *p++ = cpu_to_be32(stat.ctime.tv_nsec); 2831 } 2832 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { 2833 p = xdr_reserve_space(xdr, 12); 2834 if (!p) 2835 goto out_resource; 2836 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec); 2837 *p++ = cpu_to_be32(stat.mtime.tv_nsec); 2838 } 2839 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { 2840 struct kstat parent_stat; 2841 u64 ino = stat.ino; 2842 2843 p = xdr_reserve_space(xdr, 8); 2844 if (!p) 2845 goto out_resource; 2846 /* 2847 * Get parent's attributes if not ignoring crossmount 2848 * and this is the root of a cross-mounted filesystem. 2849 */ 2850 if (ignore_crossmnt == 0 && 2851 dentry == exp->ex_path.mnt->mnt_root) { 2852 err = get_parent_attributes(exp, &parent_stat); 2853 if (err) 2854 goto out_nfserr; 2855 ino = parent_stat.ino; 2856 } 2857 p = xdr_encode_hyper(p, ino); 2858 } 2859 #ifdef CONFIG_NFSD_PNFS 2860 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) { 2861 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 2862 if (status) 2863 goto out; 2864 } 2865 2866 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) { 2867 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 2868 if (status) 2869 goto out; 2870 } 2871 2872 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) { 2873 p = xdr_reserve_space(xdr, 4); 2874 if (!p) 2875 goto out_resource; 2876 *p++ = cpu_to_be32(stat.blksize); 2877 } 2878 #endif /* CONFIG_NFSD_PNFS */ 2879 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) { 2880 u32 supp[3]; 2881 2882 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2883 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0; 2884 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1; 2885 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2; 2886 2887 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]); 2888 if (status) 2889 goto out; 2890 } 2891 2892 if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) { 2893 p = xdr_reserve_space(xdr, 4); 2894 if (!p) 2895 goto out_resource; 2896 if (IS_I_VERSION(d_inode(dentry))) 2897 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR); 2898 else 2899 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA); 2900 } 2901 2902 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2903 status = nfsd4_encode_security_label(xdr, rqstp, context, 2904 contextlen); 2905 if (status) 2906 goto out; 2907 } 2908 2909 attrlen = htonl(xdr->buf->len - attrlen_offset - 4); 2910 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4); 2911 status = nfs_ok; 2912 2913 out: 2914 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2915 if (context) 2916 security_release_secctx(context, contextlen); 2917 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2918 kfree(acl); 2919 if (tempfh) { 2920 fh_put(tempfh); 2921 kfree(tempfh); 2922 } 2923 if (status) 2924 xdr_truncate_encode(xdr, starting_len); 2925 return status; 2926 out_nfserr: 2927 status = nfserrno(err); 2928 goto out; 2929 out_resource: 2930 status = nfserr_resource; 2931 goto out; 2932 } 2933 2934 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, 2935 struct xdr_buf *buf, __be32 *p, int bytes) 2936 { 2937 xdr->scratch.iov_len = 0; 2938 memset(buf, 0, sizeof(struct xdr_buf)); 2939 buf->head[0].iov_base = p; 2940 buf->head[0].iov_len = 0; 2941 buf->len = 0; 2942 xdr->buf = buf; 2943 xdr->iov = buf->head; 2944 xdr->p = p; 2945 xdr->end = (void *)p + bytes; 2946 buf->buflen = bytes; 2947 } 2948 2949 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, 2950 struct svc_fh *fhp, struct svc_export *exp, 2951 struct dentry *dentry, u32 *bmval, 2952 struct svc_rqst *rqstp, int ignore_crossmnt) 2953 { 2954 struct xdr_buf dummy; 2955 struct xdr_stream xdr; 2956 __be32 ret; 2957 2958 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); 2959 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp, 2960 ignore_crossmnt); 2961 *p = xdr.p; 2962 return ret; 2963 } 2964 2965 static inline int attributes_need_mount(u32 *bmval) 2966 { 2967 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) 2968 return 1; 2969 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) 2970 return 1; 2971 return 0; 2972 } 2973 2974 static __be32 2975 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd, 2976 const char *name, int namlen) 2977 { 2978 struct svc_export *exp = cd->rd_fhp->fh_export; 2979 struct dentry *dentry; 2980 __be32 nfserr; 2981 int ignore_crossmnt = 0; 2982 2983 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen); 2984 if (IS_ERR(dentry)) 2985 return nfserrno(PTR_ERR(dentry)); 2986 if (d_really_is_negative(dentry)) { 2987 /* 2988 * we're not holding the i_mutex here, so there's 2989 * a window where this directory entry could have gone 2990 * away. 2991 */ 2992 dput(dentry); 2993 return nfserr_noent; 2994 } 2995 2996 exp_get(exp); 2997 /* 2998 * In the case of a mountpoint, the client may be asking for 2999 * attributes that are only properties of the underlying filesystem 3000 * as opposed to the cross-mounted file system. In such a case, 3001 * we will not follow the cross mount and will fill the attribtutes 3002 * directly from the mountpoint dentry. 3003 */ 3004 if (nfsd_mountpoint(dentry, exp)) { 3005 int err; 3006 3007 if (!(exp->ex_flags & NFSEXP_V4ROOT) 3008 && !attributes_need_mount(cd->rd_bmval)) { 3009 ignore_crossmnt = 1; 3010 goto out_encode; 3011 } 3012 /* 3013 * Why the heck aren't we just using nfsd_lookup?? 3014 * Different "."/".." handling? Something else? 3015 * At least, add a comment here to explain.... 3016 */ 3017 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); 3018 if (err) { 3019 nfserr = nfserrno(err); 3020 goto out_put; 3021 } 3022 nfserr = check_nfsd_access(exp, cd->rd_rqstp); 3023 if (nfserr) 3024 goto out_put; 3025 3026 } 3027 out_encode: 3028 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval, 3029 cd->rd_rqstp, ignore_crossmnt); 3030 out_put: 3031 dput(dentry); 3032 exp_put(exp); 3033 return nfserr; 3034 } 3035 3036 static __be32 * 3037 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr) 3038 { 3039 __be32 *p; 3040 3041 p = xdr_reserve_space(xdr, 20); 3042 if (!p) 3043 return NULL; 3044 *p++ = htonl(2); 3045 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ 3046 *p++ = htonl(0); /* bmval1 */ 3047 3048 *p++ = htonl(4); /* attribute length */ 3049 *p++ = nfserr; /* no htonl */ 3050 return p; 3051 } 3052 3053 static int 3054 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen, 3055 loff_t offset, u64 ino, unsigned int d_type) 3056 { 3057 struct readdir_cd *ccd = ccdv; 3058 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 3059 struct xdr_stream *xdr = cd->xdr; 3060 int start_offset = xdr->buf->len; 3061 int cookie_offset; 3062 u32 name_and_cookie; 3063 int entry_bytes; 3064 __be32 nfserr = nfserr_toosmall; 3065 __be64 wire_offset; 3066 __be32 *p; 3067 3068 /* In nfsv4, "." and ".." never make it onto the wire.. */ 3069 if (name && isdotent(name, namlen)) { 3070 cd->common.err = nfs_ok; 3071 return 0; 3072 } 3073 3074 if (cd->cookie_offset) { 3075 wire_offset = cpu_to_be64(offset); 3076 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset, 3077 &wire_offset, 8); 3078 } 3079 3080 p = xdr_reserve_space(xdr, 4); 3081 if (!p) 3082 goto fail; 3083 *p++ = xdr_one; /* mark entry present */ 3084 cookie_offset = xdr->buf->len; 3085 p = xdr_reserve_space(xdr, 3*4 + namlen); 3086 if (!p) 3087 goto fail; 3088 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */ 3089 p = xdr_encode_array(p, name, namlen); /* name length & name */ 3090 3091 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen); 3092 switch (nfserr) { 3093 case nfs_ok: 3094 break; 3095 case nfserr_resource: 3096 nfserr = nfserr_toosmall; 3097 goto fail; 3098 case nfserr_noent: 3099 xdr_truncate_encode(xdr, start_offset); 3100 goto skip_entry; 3101 default: 3102 /* 3103 * If the client requested the RDATTR_ERROR attribute, 3104 * we stuff the error code into this attribute 3105 * and continue. If this attribute was not requested, 3106 * then in accordance with the spec, we fail the 3107 * entire READDIR operation(!) 3108 */ 3109 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 3110 goto fail; 3111 p = nfsd4_encode_rdattr_error(xdr, nfserr); 3112 if (p == NULL) { 3113 nfserr = nfserr_toosmall; 3114 goto fail; 3115 } 3116 } 3117 nfserr = nfserr_toosmall; 3118 entry_bytes = xdr->buf->len - start_offset; 3119 if (entry_bytes > cd->rd_maxcount) 3120 goto fail; 3121 cd->rd_maxcount -= entry_bytes; 3122 /* 3123 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so 3124 * let's always let through the first entry, at least: 3125 */ 3126 if (!cd->rd_dircount) 3127 goto fail; 3128 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8; 3129 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset) 3130 goto fail; 3131 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie); 3132 3133 cd->cookie_offset = cookie_offset; 3134 skip_entry: 3135 cd->common.err = nfs_ok; 3136 return 0; 3137 fail: 3138 xdr_truncate_encode(xdr, start_offset); 3139 cd->common.err = nfserr; 3140 return -EINVAL; 3141 } 3142 3143 static __be32 3144 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid) 3145 { 3146 __be32 *p; 3147 3148 p = xdr_reserve_space(xdr, sizeof(stateid_t)); 3149 if (!p) 3150 return nfserr_resource; 3151 *p++ = cpu_to_be32(sid->si_generation); 3152 p = xdr_encode_opaque_fixed(p, &sid->si_opaque, 3153 sizeof(stateid_opaque_t)); 3154 return 0; 3155 } 3156 3157 static __be32 3158 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access) 3159 { 3160 struct xdr_stream *xdr = &resp->xdr; 3161 __be32 *p; 3162 3163 p = xdr_reserve_space(xdr, 8); 3164 if (!p) 3165 return nfserr_resource; 3166 *p++ = cpu_to_be32(access->ac_supported); 3167 *p++ = cpu_to_be32(access->ac_resp_access); 3168 return 0; 3169 } 3170 3171 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts) 3172 { 3173 struct xdr_stream *xdr = &resp->xdr; 3174 __be32 *p; 3175 3176 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8); 3177 if (!p) 3178 return nfserr_resource; 3179 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data, 3180 NFS4_MAX_SESSIONID_LEN); 3181 *p++ = cpu_to_be32(bcts->dir); 3182 /* Upshifting from TCP to RDMA is not supported */ 3183 *p++ = cpu_to_be32(0); 3184 return 0; 3185 } 3186 3187 static __be32 3188 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close) 3189 { 3190 struct xdr_stream *xdr = &resp->xdr; 3191 3192 return nfsd4_encode_stateid(xdr, &close->cl_stateid); 3193 } 3194 3195 3196 static __be32 3197 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit) 3198 { 3199 struct xdr_stream *xdr = &resp->xdr; 3200 __be32 *p; 3201 3202 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3203 if (!p) 3204 return nfserr_resource; 3205 p = xdr_encode_opaque_fixed(p, commit->co_verf.data, 3206 NFS4_VERIFIER_SIZE); 3207 return 0; 3208 } 3209 3210 static __be32 3211 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create) 3212 { 3213 struct xdr_stream *xdr = &resp->xdr; 3214 __be32 *p; 3215 3216 p = xdr_reserve_space(xdr, 20); 3217 if (!p) 3218 return nfserr_resource; 3219 encode_cinfo(p, &create->cr_cinfo); 3220 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0], 3221 create->cr_bmval[1], create->cr_bmval[2]); 3222 return 0; 3223 } 3224 3225 static __be32 3226 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr) 3227 { 3228 struct svc_fh *fhp = getattr->ga_fhp; 3229 struct xdr_stream *xdr = &resp->xdr; 3230 3231 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry, 3232 getattr->ga_bmval, resp->rqstp, 0); 3233 } 3234 3235 static __be32 3236 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp) 3237 { 3238 struct xdr_stream *xdr = &resp->xdr; 3239 struct svc_fh *fhp = *fhpp; 3240 unsigned int len; 3241 __be32 *p; 3242 3243 len = fhp->fh_handle.fh_size; 3244 p = xdr_reserve_space(xdr, len + 4); 3245 if (!p) 3246 return nfserr_resource; 3247 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len); 3248 return 0; 3249 } 3250 3251 /* 3252 * Including all fields other than the name, a LOCK4denied structure requires 3253 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. 3254 */ 3255 static __be32 3256 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld) 3257 { 3258 struct xdr_netobj *conf = &ld->ld_owner; 3259 __be32 *p; 3260 3261 again: 3262 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len)); 3263 if (!p) { 3264 /* 3265 * Don't fail to return the result just because we can't 3266 * return the conflicting open: 3267 */ 3268 if (conf->len) { 3269 kfree(conf->data); 3270 conf->len = 0; 3271 conf->data = NULL; 3272 goto again; 3273 } 3274 return nfserr_resource; 3275 } 3276 p = xdr_encode_hyper(p, ld->ld_start); 3277 p = xdr_encode_hyper(p, ld->ld_length); 3278 *p++ = cpu_to_be32(ld->ld_type); 3279 if (conf->len) { 3280 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8); 3281 p = xdr_encode_opaque(p, conf->data, conf->len); 3282 kfree(conf->data); 3283 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ 3284 p = xdr_encode_hyper(p, (u64)0); /* clientid */ 3285 *p++ = cpu_to_be32(0); /* length of owner name */ 3286 } 3287 return nfserr_denied; 3288 } 3289 3290 static __be32 3291 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock) 3292 { 3293 struct xdr_stream *xdr = &resp->xdr; 3294 3295 if (!nfserr) 3296 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid); 3297 else if (nfserr == nfserr_denied) 3298 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied); 3299 3300 return nfserr; 3301 } 3302 3303 static __be32 3304 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt) 3305 { 3306 struct xdr_stream *xdr = &resp->xdr; 3307 3308 if (nfserr == nfserr_denied) 3309 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied); 3310 return nfserr; 3311 } 3312 3313 static __be32 3314 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku) 3315 { 3316 struct xdr_stream *xdr = &resp->xdr; 3317 3318 return nfsd4_encode_stateid(xdr, &locku->lu_stateid); 3319 } 3320 3321 3322 static __be32 3323 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link) 3324 { 3325 struct xdr_stream *xdr = &resp->xdr; 3326 __be32 *p; 3327 3328 p = xdr_reserve_space(xdr, 20); 3329 if (!p) 3330 return nfserr_resource; 3331 p = encode_cinfo(p, &link->li_cinfo); 3332 return 0; 3333 } 3334 3335 3336 static __be32 3337 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open) 3338 { 3339 struct xdr_stream *xdr = &resp->xdr; 3340 __be32 *p; 3341 3342 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid); 3343 if (nfserr) 3344 return nfserr; 3345 p = xdr_reserve_space(xdr, 24); 3346 if (!p) 3347 return nfserr_resource; 3348 p = encode_cinfo(p, &open->op_cinfo); 3349 *p++ = cpu_to_be32(open->op_rflags); 3350 3351 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1], 3352 open->op_bmval[2]); 3353 if (nfserr) 3354 return nfserr; 3355 3356 p = xdr_reserve_space(xdr, 4); 3357 if (!p) 3358 return nfserr_resource; 3359 3360 *p++ = cpu_to_be32(open->op_delegate_type); 3361 switch (open->op_delegate_type) { 3362 case NFS4_OPEN_DELEGATE_NONE: 3363 break; 3364 case NFS4_OPEN_DELEGATE_READ: 3365 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3366 if (nfserr) 3367 return nfserr; 3368 p = xdr_reserve_space(xdr, 20); 3369 if (!p) 3370 return nfserr_resource; 3371 *p++ = cpu_to_be32(open->op_recall); 3372 3373 /* 3374 * TODO: ACE's in delegations 3375 */ 3376 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3377 *p++ = cpu_to_be32(0); 3378 *p++ = cpu_to_be32(0); 3379 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3380 break; 3381 case NFS4_OPEN_DELEGATE_WRITE: 3382 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3383 if (nfserr) 3384 return nfserr; 3385 p = xdr_reserve_space(xdr, 32); 3386 if (!p) 3387 return nfserr_resource; 3388 *p++ = cpu_to_be32(0); 3389 3390 /* 3391 * TODO: space_limit's in delegations 3392 */ 3393 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE); 3394 *p++ = cpu_to_be32(~(u32)0); 3395 *p++ = cpu_to_be32(~(u32)0); 3396 3397 /* 3398 * TODO: ACE's in delegations 3399 */ 3400 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3401 *p++ = cpu_to_be32(0); 3402 *p++ = cpu_to_be32(0); 3403 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3404 break; 3405 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */ 3406 switch (open->op_why_no_deleg) { 3407 case WND4_CONTENTION: 3408 case WND4_RESOURCE: 3409 p = xdr_reserve_space(xdr, 8); 3410 if (!p) 3411 return nfserr_resource; 3412 *p++ = cpu_to_be32(open->op_why_no_deleg); 3413 /* deleg signaling not supported yet: */ 3414 *p++ = cpu_to_be32(0); 3415 break; 3416 default: 3417 p = xdr_reserve_space(xdr, 4); 3418 if (!p) 3419 return nfserr_resource; 3420 *p++ = cpu_to_be32(open->op_why_no_deleg); 3421 } 3422 break; 3423 default: 3424 BUG(); 3425 } 3426 /* XXX save filehandle here */ 3427 return 0; 3428 } 3429 3430 static __be32 3431 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc) 3432 { 3433 struct xdr_stream *xdr = &resp->xdr; 3434 3435 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid); 3436 } 3437 3438 static __be32 3439 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od) 3440 { 3441 struct xdr_stream *xdr = &resp->xdr; 3442 3443 return nfsd4_encode_stateid(xdr, &od->od_stateid); 3444 } 3445 3446 static __be32 nfsd4_encode_splice_read( 3447 struct nfsd4_compoundres *resp, 3448 struct nfsd4_read *read, 3449 struct file *file, unsigned long maxcount) 3450 { 3451 struct xdr_stream *xdr = &resp->xdr; 3452 struct xdr_buf *buf = xdr->buf; 3453 u32 eof; 3454 long len; 3455 int space_left; 3456 __be32 nfserr; 3457 __be32 *p = xdr->p - 2; 3458 3459 /* Make sure there will be room for padding if needed */ 3460 if (xdr->end - xdr->p < 1) 3461 return nfserr_resource; 3462 3463 len = maxcount; 3464 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp, 3465 file, read->rd_offset, &maxcount); 3466 read->rd_length = maxcount; 3467 if (nfserr) { 3468 /* 3469 * nfsd_splice_actor may have already messed with the 3470 * page length; reset it so as not to confuse 3471 * xdr_truncate_encode: 3472 */ 3473 buf->page_len = 0; 3474 return nfserr; 3475 } 3476 3477 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset, 3478 d_inode(read->rd_fhp->fh_dentry)->i_size); 3479 3480 *(p++) = htonl(eof); 3481 *(p++) = htonl(maxcount); 3482 3483 buf->page_len = maxcount; 3484 buf->len += maxcount; 3485 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1) 3486 / PAGE_SIZE; 3487 3488 /* Use rest of head for padding and remaining ops: */ 3489 buf->tail[0].iov_base = xdr->p; 3490 buf->tail[0].iov_len = 0; 3491 xdr->iov = buf->tail; 3492 if (maxcount&3) { 3493 int pad = 4 - (maxcount&3); 3494 3495 *(xdr->p++) = 0; 3496 3497 buf->tail[0].iov_base += maxcount&3; 3498 buf->tail[0].iov_len = pad; 3499 buf->len += pad; 3500 } 3501 3502 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p, 3503 buf->buflen - buf->len); 3504 buf->buflen = buf->len + space_left; 3505 xdr->end = (__be32 *)((void *)xdr->end + space_left); 3506 3507 return 0; 3508 } 3509 3510 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, 3511 struct nfsd4_read *read, 3512 struct file *file, unsigned long maxcount) 3513 { 3514 struct xdr_stream *xdr = &resp->xdr; 3515 u32 eof; 3516 int v; 3517 int starting_len = xdr->buf->len - 8; 3518 long len; 3519 int thislen; 3520 __be32 nfserr; 3521 __be32 tmp; 3522 __be32 *p; 3523 u32 zzz = 0; 3524 int pad; 3525 3526 len = maxcount; 3527 v = 0; 3528 3529 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p)); 3530 p = xdr_reserve_space(xdr, (thislen+3)&~3); 3531 WARN_ON_ONCE(!p); 3532 resp->rqstp->rq_vec[v].iov_base = p; 3533 resp->rqstp->rq_vec[v].iov_len = thislen; 3534 v++; 3535 len -= thislen; 3536 3537 while (len) { 3538 thislen = min_t(long, len, PAGE_SIZE); 3539 p = xdr_reserve_space(xdr, (thislen+3)&~3); 3540 WARN_ON_ONCE(!p); 3541 resp->rqstp->rq_vec[v].iov_base = p; 3542 resp->rqstp->rq_vec[v].iov_len = thislen; 3543 v++; 3544 len -= thislen; 3545 } 3546 read->rd_vlen = v; 3547 3548 len = maxcount; 3549 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset, 3550 resp->rqstp->rq_vec, read->rd_vlen, &maxcount); 3551 read->rd_length = maxcount; 3552 if (nfserr) 3553 return nfserr; 3554 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3)); 3555 3556 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset, 3557 d_inode(read->rd_fhp->fh_dentry)->i_size); 3558 3559 tmp = htonl(eof); 3560 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4); 3561 tmp = htonl(maxcount); 3562 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4); 3563 3564 pad = (maxcount&3) ? 4 - (maxcount&3) : 0; 3565 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount, 3566 &zzz, pad); 3567 return 0; 3568 3569 } 3570 3571 static __be32 3572 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 3573 struct nfsd4_read *read) 3574 { 3575 unsigned long maxcount; 3576 struct xdr_stream *xdr = &resp->xdr; 3577 struct file *file = read->rd_filp; 3578 int starting_len = xdr->buf->len; 3579 struct raparms *ra = NULL; 3580 __be32 *p; 3581 3582 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ 3583 if (!p) { 3584 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)); 3585 return nfserr_resource; 3586 } 3587 if (resp->xdr.buf->page_len && 3588 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) { 3589 WARN_ON_ONCE(1); 3590 return nfserr_resource; 3591 } 3592 xdr_commit_encode(xdr); 3593 3594 maxcount = svc_max_payload(resp->rqstp); 3595 maxcount = min_t(unsigned long, maxcount, 3596 (xdr->buf->buflen - xdr->buf->len)); 3597 maxcount = min_t(unsigned long, maxcount, read->rd_length); 3598 3599 if (read->rd_tmp_file) 3600 ra = nfsd_init_raparms(file); 3601 3602 if (file->f_op->splice_read && 3603 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) 3604 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 3605 else 3606 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 3607 3608 if (ra) 3609 nfsd_put_raparams(file, ra); 3610 3611 if (nfserr) 3612 xdr_truncate_encode(xdr, starting_len); 3613 3614 return nfserr; 3615 } 3616 3617 static __be32 3618 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink) 3619 { 3620 int maxcount; 3621 __be32 wire_count; 3622 int zero = 0; 3623 struct xdr_stream *xdr = &resp->xdr; 3624 int length_offset = xdr->buf->len; 3625 __be32 *p; 3626 3627 p = xdr_reserve_space(xdr, 4); 3628 if (!p) 3629 return nfserr_resource; 3630 maxcount = PAGE_SIZE; 3631 3632 p = xdr_reserve_space(xdr, maxcount); 3633 if (!p) 3634 return nfserr_resource; 3635 /* 3636 * XXX: By default, vfs_readlink() will truncate symlinks if they 3637 * would overflow the buffer. Is this kosher in NFSv4? If not, one 3638 * easy fix is: if vfs_readlink() precisely fills the buffer, assume 3639 * that truncation occurred, and return NFS4ERR_RESOURCE. 3640 */ 3641 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, 3642 (char *)p, &maxcount); 3643 if (nfserr == nfserr_isdir) 3644 nfserr = nfserr_inval; 3645 if (nfserr) { 3646 xdr_truncate_encode(xdr, length_offset); 3647 return nfserr; 3648 } 3649 3650 wire_count = htonl(maxcount); 3651 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4); 3652 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4)); 3653 if (maxcount & 3) 3654 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, 3655 &zero, 4 - (maxcount&3)); 3656 return 0; 3657 } 3658 3659 static __be32 3660 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir) 3661 { 3662 int maxcount; 3663 int bytes_left; 3664 loff_t offset; 3665 __be64 wire_offset; 3666 struct xdr_stream *xdr = &resp->xdr; 3667 int starting_len = xdr->buf->len; 3668 __be32 *p; 3669 3670 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3671 if (!p) 3672 return nfserr_resource; 3673 3674 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ 3675 *p++ = cpu_to_be32(0); 3676 *p++ = cpu_to_be32(0); 3677 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p) 3678 - (char *)resp->xdr.buf->head[0].iov_base; 3679 3680 /* 3681 * Number of bytes left for directory entries allowing for the 3682 * final 8 bytes of the readdir and a following failed op: 3683 */ 3684 bytes_left = xdr->buf->buflen - xdr->buf->len 3685 - COMPOUND_ERR_SLACK_SPACE - 8; 3686 if (bytes_left < 0) { 3687 nfserr = nfserr_resource; 3688 goto err_no_verf; 3689 } 3690 maxcount = svc_max_payload(resp->rqstp); 3691 maxcount = min_t(u32, readdir->rd_maxcount, maxcount); 3692 /* 3693 * Note the rfc defines rd_maxcount as the size of the 3694 * READDIR4resok structure, which includes the verifier above 3695 * and the 8 bytes encoded at the end of this function: 3696 */ 3697 if (maxcount < 16) { 3698 nfserr = nfserr_toosmall; 3699 goto err_no_verf; 3700 } 3701 maxcount = min_t(int, maxcount-16, bytes_left); 3702 3703 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */ 3704 if (!readdir->rd_dircount) 3705 readdir->rd_dircount = svc_max_payload(resp->rqstp); 3706 3707 readdir->xdr = xdr; 3708 readdir->rd_maxcount = maxcount; 3709 readdir->common.err = 0; 3710 readdir->cookie_offset = 0; 3711 3712 offset = readdir->rd_cookie; 3713 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, 3714 &offset, 3715 &readdir->common, nfsd4_encode_dirent); 3716 if (nfserr == nfs_ok && 3717 readdir->common.err == nfserr_toosmall && 3718 xdr->buf->len == starting_len + 8) { 3719 /* nothing encoded; which limit did we hit?: */ 3720 if (maxcount - 16 < bytes_left) 3721 /* It was the fault of rd_maxcount: */ 3722 nfserr = nfserr_toosmall; 3723 else 3724 /* We ran out of buffer space: */ 3725 nfserr = nfserr_resource; 3726 } 3727 if (nfserr) 3728 goto err_no_verf; 3729 3730 if (readdir->cookie_offset) { 3731 wire_offset = cpu_to_be64(offset); 3732 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, 3733 &wire_offset, 8); 3734 } 3735 3736 p = xdr_reserve_space(xdr, 8); 3737 if (!p) { 3738 WARN_ON_ONCE(1); 3739 goto err_no_verf; 3740 } 3741 *p++ = 0; /* no more entries */ 3742 *p++ = htonl(readdir->common.err == nfserr_eof); 3743 3744 return 0; 3745 err_no_verf: 3746 xdr_truncate_encode(xdr, starting_len); 3747 return nfserr; 3748 } 3749 3750 static __be32 3751 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove) 3752 { 3753 struct xdr_stream *xdr = &resp->xdr; 3754 __be32 *p; 3755 3756 p = xdr_reserve_space(xdr, 20); 3757 if (!p) 3758 return nfserr_resource; 3759 p = encode_cinfo(p, &remove->rm_cinfo); 3760 return 0; 3761 } 3762 3763 static __be32 3764 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename) 3765 { 3766 struct xdr_stream *xdr = &resp->xdr; 3767 __be32 *p; 3768 3769 p = xdr_reserve_space(xdr, 40); 3770 if (!p) 3771 return nfserr_resource; 3772 p = encode_cinfo(p, &rename->rn_sinfo); 3773 p = encode_cinfo(p, &rename->rn_tinfo); 3774 return 0; 3775 } 3776 3777 static __be32 3778 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp) 3779 { 3780 u32 i, nflavs, supported; 3781 struct exp_flavor_info *flavs; 3782 struct exp_flavor_info def_flavs[2]; 3783 __be32 *p, *flavorsp; 3784 static bool report = true; 3785 3786 if (exp->ex_nflavors) { 3787 flavs = exp->ex_flavors; 3788 nflavs = exp->ex_nflavors; 3789 } else { /* Handling of some defaults in absence of real secinfo: */ 3790 flavs = def_flavs; 3791 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { 3792 nflavs = 2; 3793 flavs[0].pseudoflavor = RPC_AUTH_UNIX; 3794 flavs[1].pseudoflavor = RPC_AUTH_NULL; 3795 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { 3796 nflavs = 1; 3797 flavs[0].pseudoflavor 3798 = svcauth_gss_flavor(exp->ex_client); 3799 } else { 3800 nflavs = 1; 3801 flavs[0].pseudoflavor 3802 = exp->ex_client->flavour->flavour; 3803 } 3804 } 3805 3806 supported = 0; 3807 p = xdr_reserve_space(xdr, 4); 3808 if (!p) 3809 return nfserr_resource; 3810 flavorsp = p++; /* to be backfilled later */ 3811 3812 for (i = 0; i < nflavs; i++) { 3813 rpc_authflavor_t pf = flavs[i].pseudoflavor; 3814 struct rpcsec_gss_info info; 3815 3816 if (rpcauth_get_gssinfo(pf, &info) == 0) { 3817 supported++; 3818 p = xdr_reserve_space(xdr, 4 + 4 + 3819 XDR_LEN(info.oid.len) + 4 + 4); 3820 if (!p) 3821 return nfserr_resource; 3822 *p++ = cpu_to_be32(RPC_AUTH_GSS); 3823 p = xdr_encode_opaque(p, info.oid.data, info.oid.len); 3824 *p++ = cpu_to_be32(info.qop); 3825 *p++ = cpu_to_be32(info.service); 3826 } else if (pf < RPC_AUTH_MAXFLAVOR) { 3827 supported++; 3828 p = xdr_reserve_space(xdr, 4); 3829 if (!p) 3830 return nfserr_resource; 3831 *p++ = cpu_to_be32(pf); 3832 } else { 3833 if (report) 3834 pr_warn("NFS: SECINFO: security flavor %u " 3835 "is not supported\n", pf); 3836 } 3837 } 3838 3839 if (nflavs != supported) 3840 report = false; 3841 *flavorsp = htonl(supported); 3842 return 0; 3843 } 3844 3845 static __be32 3846 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 3847 struct nfsd4_secinfo *secinfo) 3848 { 3849 struct xdr_stream *xdr = &resp->xdr; 3850 3851 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp); 3852 } 3853 3854 static __be32 3855 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, 3856 struct nfsd4_secinfo_no_name *secinfo) 3857 { 3858 struct xdr_stream *xdr = &resp->xdr; 3859 3860 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp); 3861 } 3862 3863 /* 3864 * The SETATTR encode routine is special -- it always encodes a bitmap, 3865 * regardless of the error status. 3866 */ 3867 static __be32 3868 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr) 3869 { 3870 struct xdr_stream *xdr = &resp->xdr; 3871 __be32 *p; 3872 3873 p = xdr_reserve_space(xdr, 16); 3874 if (!p) 3875 return nfserr_resource; 3876 if (nfserr) { 3877 *p++ = cpu_to_be32(3); 3878 *p++ = cpu_to_be32(0); 3879 *p++ = cpu_to_be32(0); 3880 *p++ = cpu_to_be32(0); 3881 } 3882 else { 3883 *p++ = cpu_to_be32(3); 3884 *p++ = cpu_to_be32(setattr->sa_bmval[0]); 3885 *p++ = cpu_to_be32(setattr->sa_bmval[1]); 3886 *p++ = cpu_to_be32(setattr->sa_bmval[2]); 3887 } 3888 return nfserr; 3889 } 3890 3891 static __be32 3892 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd) 3893 { 3894 struct xdr_stream *xdr = &resp->xdr; 3895 __be32 *p; 3896 3897 if (!nfserr) { 3898 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE); 3899 if (!p) 3900 return nfserr_resource; 3901 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8); 3902 p = xdr_encode_opaque_fixed(p, &scd->se_confirm, 3903 NFS4_VERIFIER_SIZE); 3904 } 3905 else if (nfserr == nfserr_clid_inuse) { 3906 p = xdr_reserve_space(xdr, 8); 3907 if (!p) 3908 return nfserr_resource; 3909 *p++ = cpu_to_be32(0); 3910 *p++ = cpu_to_be32(0); 3911 } 3912 return nfserr; 3913 } 3914 3915 static __be32 3916 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write) 3917 { 3918 struct xdr_stream *xdr = &resp->xdr; 3919 __be32 *p; 3920 3921 p = xdr_reserve_space(xdr, 16); 3922 if (!p) 3923 return nfserr_resource; 3924 *p++ = cpu_to_be32(write->wr_bytes_written); 3925 *p++ = cpu_to_be32(write->wr_how_written); 3926 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 3927 NFS4_VERIFIER_SIZE); 3928 return 0; 3929 } 3930 3931 static __be32 3932 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, 3933 struct nfsd4_exchange_id *exid) 3934 { 3935 struct xdr_stream *xdr = &resp->xdr; 3936 __be32 *p; 3937 char *major_id; 3938 char *server_scope; 3939 int major_id_sz; 3940 int server_scope_sz; 3941 uint64_t minor_id = 0; 3942 3943 major_id = utsname()->nodename; 3944 major_id_sz = strlen(major_id); 3945 server_scope = utsname()->nodename; 3946 server_scope_sz = strlen(server_scope); 3947 3948 p = xdr_reserve_space(xdr, 3949 8 /* eir_clientid */ + 3950 4 /* eir_sequenceid */ + 3951 4 /* eir_flags */ + 3952 4 /* spr_how */); 3953 if (!p) 3954 return nfserr_resource; 3955 3956 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8); 3957 *p++ = cpu_to_be32(exid->seqid); 3958 *p++ = cpu_to_be32(exid->flags); 3959 3960 *p++ = cpu_to_be32(exid->spa_how); 3961 3962 switch (exid->spa_how) { 3963 case SP4_NONE: 3964 break; 3965 case SP4_MACH_CRED: 3966 /* spo_must_enforce bitmap: */ 3967 nfserr = nfsd4_encode_bitmap(xdr, 3968 exid->spo_must_enforce[0], 3969 exid->spo_must_enforce[1], 3970 exid->spo_must_enforce[2]); 3971 if (nfserr) 3972 return nfserr; 3973 /* spo_must_allow bitmap: */ 3974 nfserr = nfsd4_encode_bitmap(xdr, 3975 exid->spo_must_allow[0], 3976 exid->spo_must_allow[1], 3977 exid->spo_must_allow[2]); 3978 if (nfserr) 3979 return nfserr; 3980 break; 3981 default: 3982 WARN_ON_ONCE(1); 3983 } 3984 3985 p = xdr_reserve_space(xdr, 3986 8 /* so_minor_id */ + 3987 4 /* so_major_id.len */ + 3988 (XDR_QUADLEN(major_id_sz) * 4) + 3989 4 /* eir_server_scope.len */ + 3990 (XDR_QUADLEN(server_scope_sz) * 4) + 3991 4 /* eir_server_impl_id.count (0) */); 3992 if (!p) 3993 return nfserr_resource; 3994 3995 /* The server_owner struct */ 3996 p = xdr_encode_hyper(p, minor_id); /* Minor id */ 3997 /* major id */ 3998 p = xdr_encode_opaque(p, major_id, major_id_sz); 3999 4000 /* Server scope */ 4001 p = xdr_encode_opaque(p, server_scope, server_scope_sz); 4002 4003 /* Implementation id */ 4004 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */ 4005 return 0; 4006 } 4007 4008 static __be32 4009 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, 4010 struct nfsd4_create_session *sess) 4011 { 4012 struct xdr_stream *xdr = &resp->xdr; 4013 __be32 *p; 4014 4015 p = xdr_reserve_space(xdr, 24); 4016 if (!p) 4017 return nfserr_resource; 4018 p = xdr_encode_opaque_fixed(p, sess->sessionid.data, 4019 NFS4_MAX_SESSIONID_LEN); 4020 *p++ = cpu_to_be32(sess->seqid); 4021 *p++ = cpu_to_be32(sess->flags); 4022 4023 p = xdr_reserve_space(xdr, 28); 4024 if (!p) 4025 return nfserr_resource; 4026 *p++ = cpu_to_be32(0); /* headerpadsz */ 4027 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz); 4028 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz); 4029 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached); 4030 *p++ = cpu_to_be32(sess->fore_channel.maxops); 4031 *p++ = cpu_to_be32(sess->fore_channel.maxreqs); 4032 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs); 4033 4034 if (sess->fore_channel.nr_rdma_attrs) { 4035 p = xdr_reserve_space(xdr, 4); 4036 if (!p) 4037 return nfserr_resource; 4038 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs); 4039 } 4040 4041 p = xdr_reserve_space(xdr, 28); 4042 if (!p) 4043 return nfserr_resource; 4044 *p++ = cpu_to_be32(0); /* headerpadsz */ 4045 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz); 4046 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz); 4047 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached); 4048 *p++ = cpu_to_be32(sess->back_channel.maxops); 4049 *p++ = cpu_to_be32(sess->back_channel.maxreqs); 4050 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs); 4051 4052 if (sess->back_channel.nr_rdma_attrs) { 4053 p = xdr_reserve_space(xdr, 4); 4054 if (!p) 4055 return nfserr_resource; 4056 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs); 4057 } 4058 return 0; 4059 } 4060 4061 static __be32 4062 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, 4063 struct nfsd4_sequence *seq) 4064 { 4065 struct xdr_stream *xdr = &resp->xdr; 4066 __be32 *p; 4067 4068 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20); 4069 if (!p) 4070 return nfserr_resource; 4071 p = xdr_encode_opaque_fixed(p, seq->sessionid.data, 4072 NFS4_MAX_SESSIONID_LEN); 4073 *p++ = cpu_to_be32(seq->seqid); 4074 *p++ = cpu_to_be32(seq->slotid); 4075 /* Note slotid's are numbered from zero: */ 4076 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */ 4077 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */ 4078 *p++ = cpu_to_be32(seq->status_flags); 4079 4080 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */ 4081 return 0; 4082 } 4083 4084 static __be32 4085 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, 4086 struct nfsd4_test_stateid *test_stateid) 4087 { 4088 struct xdr_stream *xdr = &resp->xdr; 4089 struct nfsd4_test_stateid_id *stateid, *next; 4090 __be32 *p; 4091 4092 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids)); 4093 if (!p) 4094 return nfserr_resource; 4095 *p++ = htonl(test_stateid->ts_num_ids); 4096 4097 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) { 4098 *p++ = stateid->ts_id_status; 4099 } 4100 4101 return 0; 4102 } 4103 4104 #ifdef CONFIG_NFSD_PNFS 4105 static __be32 4106 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4107 struct nfsd4_getdeviceinfo *gdev) 4108 { 4109 struct xdr_stream *xdr = &resp->xdr; 4110 const struct nfsd4_layout_ops *ops; 4111 u32 starting_len = xdr->buf->len, needed_len; 4112 __be32 *p; 4113 4114 p = xdr_reserve_space(xdr, 4); 4115 if (!p) 4116 return nfserr_resource; 4117 4118 *p++ = cpu_to_be32(gdev->gd_layout_type); 4119 4120 /* If maxcount is 0 then just update notifications */ 4121 if (gdev->gd_maxcount != 0) { 4122 ops = nfsd4_layout_ops[gdev->gd_layout_type]; 4123 nfserr = ops->encode_getdeviceinfo(xdr, gdev); 4124 if (nfserr) { 4125 /* 4126 * We don't bother to burden the layout drivers with 4127 * enforcing gd_maxcount, just tell the client to 4128 * come back with a bigger buffer if it's not enough. 4129 */ 4130 if (xdr->buf->len + 4 > gdev->gd_maxcount) 4131 goto toosmall; 4132 return nfserr; 4133 } 4134 } 4135 4136 if (gdev->gd_notify_types) { 4137 p = xdr_reserve_space(xdr, 4 + 4); 4138 if (!p) 4139 return nfserr_resource; 4140 *p++ = cpu_to_be32(1); /* bitmap length */ 4141 *p++ = cpu_to_be32(gdev->gd_notify_types); 4142 } else { 4143 p = xdr_reserve_space(xdr, 4); 4144 if (!p) 4145 return nfserr_resource; 4146 *p++ = 0; 4147 } 4148 4149 return 0; 4150 toosmall: 4151 dprintk("%s: maxcount too small\n", __func__); 4152 needed_len = xdr->buf->len + 4 /* notifications */; 4153 xdr_truncate_encode(xdr, starting_len); 4154 p = xdr_reserve_space(xdr, 4); 4155 if (!p) 4156 return nfserr_resource; 4157 *p++ = cpu_to_be32(needed_len); 4158 return nfserr_toosmall; 4159 } 4160 4161 static __be32 4162 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, 4163 struct nfsd4_layoutget *lgp) 4164 { 4165 struct xdr_stream *xdr = &resp->xdr; 4166 const struct nfsd4_layout_ops *ops; 4167 __be32 *p; 4168 4169 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t)); 4170 if (!p) 4171 return nfserr_resource; 4172 4173 *p++ = cpu_to_be32(1); /* we always set return-on-close */ 4174 *p++ = cpu_to_be32(lgp->lg_sid.si_generation); 4175 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque, 4176 sizeof(stateid_opaque_t)); 4177 4178 *p++ = cpu_to_be32(1); /* we always return a single layout */ 4179 p = xdr_encode_hyper(p, lgp->lg_seg.offset); 4180 p = xdr_encode_hyper(p, lgp->lg_seg.length); 4181 *p++ = cpu_to_be32(lgp->lg_seg.iomode); 4182 *p++ = cpu_to_be32(lgp->lg_layout_type); 4183 4184 ops = nfsd4_layout_ops[lgp->lg_layout_type]; 4185 return ops->encode_layoutget(xdr, lgp); 4186 } 4187 4188 static __be32 4189 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, 4190 struct nfsd4_layoutcommit *lcp) 4191 { 4192 struct xdr_stream *xdr = &resp->xdr; 4193 __be32 *p; 4194 4195 p = xdr_reserve_space(xdr, 4); 4196 if (!p) 4197 return nfserr_resource; 4198 *p++ = cpu_to_be32(lcp->lc_size_chg); 4199 if (lcp->lc_size_chg) { 4200 p = xdr_reserve_space(xdr, 8); 4201 if (!p) 4202 return nfserr_resource; 4203 p = xdr_encode_hyper(p, lcp->lc_newsize); 4204 } 4205 4206 return 0; 4207 } 4208 4209 static __be32 4210 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr, 4211 struct nfsd4_layoutreturn *lrp) 4212 { 4213 struct xdr_stream *xdr = &resp->xdr; 4214 __be32 *p; 4215 4216 p = xdr_reserve_space(xdr, 4); 4217 if (!p) 4218 return nfserr_resource; 4219 *p++ = cpu_to_be32(lrp->lrs_present); 4220 if (lrp->lrs_present) 4221 return nfsd4_encode_stateid(xdr, &lrp->lr_sid); 4222 return 0; 4223 } 4224 #endif /* CONFIG_NFSD_PNFS */ 4225 4226 static __be32 4227 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write) 4228 { 4229 __be32 *p; 4230 4231 p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE); 4232 if (!p) 4233 return nfserr_resource; 4234 4235 *p++ = cpu_to_be32(0); 4236 p = xdr_encode_hyper(p, write->wr_bytes_written); 4237 *p++ = cpu_to_be32(write->wr_stable_how); 4238 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4239 NFS4_VERIFIER_SIZE); 4240 return nfs_ok; 4241 } 4242 4243 static __be32 4244 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr, 4245 struct nfsd4_copy *copy) 4246 { 4247 __be32 *p; 4248 4249 nfserr = nfsd42_encode_write_res(resp, ©->cp_res); 4250 if (nfserr) 4251 return nfserr; 4252 4253 p = xdr_reserve_space(&resp->xdr, 4 + 4); 4254 *p++ = xdr_one; /* cr_consecutive */ 4255 *p++ = cpu_to_be32(copy->cp_synchronous); 4256 return 0; 4257 } 4258 4259 static __be32 4260 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, 4261 struct nfsd4_seek *seek) 4262 { 4263 __be32 *p; 4264 4265 p = xdr_reserve_space(&resp->xdr, 4 + 8); 4266 *p++ = cpu_to_be32(seek->seek_eof); 4267 p = xdr_encode_hyper(p, seek->seek_pos); 4268 4269 return 0; 4270 } 4271 4272 static __be32 4273 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p) 4274 { 4275 return nfserr; 4276 } 4277 4278 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *); 4279 4280 /* 4281 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1 4282 * since we don't need to filter out obsolete ops as this is 4283 * done in the decoding phase. 4284 */ 4285 static const nfsd4_enc nfsd4_enc_ops[] = { 4286 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access, 4287 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close, 4288 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit, 4289 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create, 4290 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop, 4291 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop, 4292 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr, 4293 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh, 4294 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link, 4295 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock, 4296 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt, 4297 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku, 4298 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop, 4299 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop, 4300 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop, 4301 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open, 4302 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop, 4303 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm, 4304 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade, 4305 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop, 4306 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop, 4307 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop, 4308 [OP_READ] = (nfsd4_enc)nfsd4_encode_read, 4309 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir, 4310 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink, 4311 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove, 4312 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename, 4313 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop, 4314 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop, 4315 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop, 4316 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo, 4317 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr, 4318 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid, 4319 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop, 4320 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop, 4321 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write, 4322 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop, 4323 4324 /* NFSv4.1 operations */ 4325 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop, 4326 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session, 4327 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id, 4328 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session, 4329 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop, 4330 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop, 4331 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 4332 #ifdef CONFIG_NFSD_PNFS 4333 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo, 4334 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 4335 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit, 4336 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget, 4337 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn, 4338 #else 4339 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop, 4340 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 4341 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop, 4342 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop, 4343 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop, 4344 #endif 4345 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name, 4346 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence, 4347 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop, 4348 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid, 4349 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 4350 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop, 4351 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop, 4352 4353 /* NFSv4.2 operations */ 4354 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 4355 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy, 4356 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop, 4357 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 4358 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop, 4359 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop, 4360 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop, 4361 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop, 4362 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop, 4363 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop, 4364 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek, 4365 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop, 4366 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop, 4367 }; 4368 4369 /* 4370 * Calculate whether we still have space to encode repsize bytes. 4371 * There are two considerations: 4372 * - For NFS versions >=4.1, the size of the reply must stay within 4373 * session limits 4374 * - For all NFS versions, we must stay within limited preallocated 4375 * buffer space. 4376 * 4377 * This is called before the operation is processed, so can only provide 4378 * an upper estimate. For some nonidempotent operations (such as 4379 * getattr), it's not necessarily a problem if that estimate is wrong, 4380 * as we can fail it after processing without significant side effects. 4381 */ 4382 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize) 4383 { 4384 struct xdr_buf *buf = &resp->rqstp->rq_res; 4385 struct nfsd4_slot *slot = resp->cstate.slot; 4386 4387 if (buf->len + respsize <= buf->buflen) 4388 return nfs_ok; 4389 if (!nfsd4_has_session(&resp->cstate)) 4390 return nfserr_resource; 4391 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) { 4392 WARN_ON_ONCE(1); 4393 return nfserr_rep_too_big_to_cache; 4394 } 4395 return nfserr_rep_too_big; 4396 } 4397 4398 void 4399 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 4400 { 4401 struct xdr_stream *xdr = &resp->xdr; 4402 struct nfs4_stateowner *so = resp->cstate.replay_owner; 4403 struct svc_rqst *rqstp = resp->rqstp; 4404 const struct nfsd4_operation *opdesc = op->opdesc; 4405 int post_err_offset; 4406 nfsd4_enc encoder; 4407 __be32 *p; 4408 4409 p = xdr_reserve_space(xdr, 8); 4410 if (!p) { 4411 WARN_ON_ONCE(1); 4412 return; 4413 } 4414 *p++ = cpu_to_be32(op->opnum); 4415 post_err_offset = xdr->buf->len; 4416 4417 if (op->opnum == OP_ILLEGAL) 4418 goto status; 4419 if (op->status && opdesc && 4420 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE)) 4421 goto status; 4422 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || 4423 !nfsd4_enc_ops[op->opnum]); 4424 encoder = nfsd4_enc_ops[op->opnum]; 4425 op->status = encoder(resp, op->status, &op->u); 4426 if (opdesc && opdesc->op_release) 4427 opdesc->op_release(&op->u); 4428 xdr_commit_encode(xdr); 4429 4430 /* nfsd4_check_resp_size guarantees enough room for error status */ 4431 if (!op->status) { 4432 int space_needed = 0; 4433 if (!nfsd4_last_compound_op(rqstp)) 4434 space_needed = COMPOUND_ERR_SLACK_SPACE; 4435 op->status = nfsd4_check_resp_size(resp, space_needed); 4436 } 4437 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) { 4438 struct nfsd4_slot *slot = resp->cstate.slot; 4439 4440 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) 4441 op->status = nfserr_rep_too_big_to_cache; 4442 else 4443 op->status = nfserr_rep_too_big; 4444 } 4445 if (op->status == nfserr_resource || 4446 op->status == nfserr_rep_too_big || 4447 op->status == nfserr_rep_too_big_to_cache) { 4448 /* 4449 * The operation may have already been encoded or 4450 * partially encoded. No op returns anything additional 4451 * in the case of one of these three errors, so we can 4452 * just truncate back to after the status. But it's a 4453 * bug if we had to do this on a non-idempotent op: 4454 */ 4455 warn_on_nonidempotent_op(op); 4456 xdr_truncate_encode(xdr, post_err_offset); 4457 } 4458 if (so) { 4459 int len = xdr->buf->len - post_err_offset; 4460 4461 so->so_replay.rp_status = op->status; 4462 so->so_replay.rp_buflen = len; 4463 read_bytes_from_xdr_buf(xdr->buf, post_err_offset, 4464 so->so_replay.rp_buf, len); 4465 } 4466 status: 4467 /* Note that op->status is already in network byte order: */ 4468 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4); 4469 } 4470 4471 /* 4472 * Encode the reply stored in the stateowner reply cache 4473 * 4474 * XDR note: do not encode rp->rp_buflen: the buffer contains the 4475 * previously sent already encoded operation. 4476 */ 4477 void 4478 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op) 4479 { 4480 __be32 *p; 4481 struct nfs4_replay *rp = op->replay; 4482 4483 BUG_ON(!rp); 4484 4485 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen); 4486 if (!p) { 4487 WARN_ON_ONCE(1); 4488 return; 4489 } 4490 *p++ = cpu_to_be32(op->opnum); 4491 *p++ = rp->rp_status; /* already xdr'ed */ 4492 4493 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen); 4494 } 4495 4496 int 4497 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p) 4498 { 4499 return xdr_ressize_check(rqstp, p); 4500 } 4501 4502 void nfsd4_release_compoundargs(struct svc_rqst *rqstp) 4503 { 4504 struct nfsd4_compoundargs *args = rqstp->rq_argp; 4505 4506 if (args->ops != args->iops) { 4507 kfree(args->ops); 4508 args->ops = args->iops; 4509 } 4510 kfree(args->tmpp); 4511 args->tmpp = NULL; 4512 while (args->to_free) { 4513 struct svcxdr_tmpbuf *tb = args->to_free; 4514 args->to_free = tb->next; 4515 kfree(tb); 4516 } 4517 } 4518 4519 int 4520 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p) 4521 { 4522 struct nfsd4_compoundargs *args = rqstp->rq_argp; 4523 4524 if (rqstp->rq_arg.head[0].iov_len % 4) { 4525 /* client is nuts */ 4526 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)", 4527 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid)); 4528 return 0; 4529 } 4530 args->p = p; 4531 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len; 4532 args->pagelist = rqstp->rq_arg.pages; 4533 args->pagelen = rqstp->rq_arg.page_len; 4534 args->tail = false; 4535 args->tmpp = NULL; 4536 args->to_free = NULL; 4537 args->ops = args->iops; 4538 args->rqstp = rqstp; 4539 4540 return !nfsd4_decode_compound(args); 4541 } 4542 4543 int 4544 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p) 4545 { 4546 /* 4547 * All that remains is to write the tag and operation count... 4548 */ 4549 struct nfsd4_compoundres *resp = rqstp->rq_resp; 4550 struct xdr_buf *buf = resp->xdr.buf; 4551 4552 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len + 4553 buf->tail[0].iov_len); 4554 4555 rqstp->rq_next_page = resp->xdr.page_ptr + 1; 4556 4557 p = resp->tagp; 4558 *p++ = htonl(resp->taglen); 4559 memcpy(p, resp->tag, resp->taglen); 4560 p += XDR_QUADLEN(resp->taglen); 4561 *p++ = htonl(resp->opcnt); 4562 4563 nfsd4_sequence_done(resp); 4564 return 1; 4565 } 4566 4567 /* 4568 * Local variables: 4569 * c-basic-offset: 8 4570 * End: 4571 */ 4572