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/fs_struct.h> 37 #include <linux/file.h> 38 #include <linux/slab.h> 39 #include <linux/namei.h> 40 #include <linux/statfs.h> 41 #include <linux/utsname.h> 42 #include <linux/pagemap.h> 43 #include <linux/sunrpc/svcauth_gss.h> 44 45 #include "idmap.h" 46 #include "acl.h" 47 #include "xdr4.h" 48 #include "vfs.h" 49 #include "state.h" 50 #include "cache.h" 51 #include "netns.h" 52 #include "pnfs.h" 53 54 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 55 #include <linux/security.h> 56 #endif 57 58 59 #define NFSDDBG_FACILITY NFSDDBG_XDR 60 61 const u32 nfsd_suppattrs[3][3] = { 62 {NFSD4_SUPPORTED_ATTRS_WORD0, 63 NFSD4_SUPPORTED_ATTRS_WORD1, 64 NFSD4_SUPPORTED_ATTRS_WORD2}, 65 66 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 67 NFSD4_1_SUPPORTED_ATTRS_WORD1, 68 NFSD4_1_SUPPORTED_ATTRS_WORD2}, 69 70 {NFSD4_1_SUPPORTED_ATTRS_WORD0, 71 NFSD4_1_SUPPORTED_ATTRS_WORD1, 72 NFSD4_2_SUPPORTED_ATTRS_WORD2}, 73 }; 74 75 /* 76 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing 77 * directory in order to indicate to the client that a filesystem boundary is present 78 * We use a fixed fsid for a referral 79 */ 80 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL 81 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL 82 83 static __be32 84 check_filename(char *str, int len) 85 { 86 int i; 87 88 if (len == 0) 89 return nfserr_inval; 90 if (isdotent(str, len)) 91 return nfserr_badname; 92 for (i = 0; i < len; i++) 93 if (str[i] == '/') 94 return nfserr_badname; 95 return 0; 96 } 97 98 #define DECODE_HEAD \ 99 __be32 *p; \ 100 __be32 status 101 #define DECODE_TAIL \ 102 status = 0; \ 103 out: \ 104 return status; \ 105 xdr_error: \ 106 dprintk("NFSD: xdr error (%s:%d)\n", \ 107 __FILE__, __LINE__); \ 108 status = nfserr_bad_xdr; \ 109 goto out 110 111 #define READMEM(x,nbytes) do { \ 112 x = (char *)p; \ 113 p += XDR_QUADLEN(nbytes); \ 114 } while (0) 115 #define SAVEMEM(x,nbytes) do { \ 116 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \ 117 savemem(argp, p, nbytes) : \ 118 (char *)p)) { \ 119 dprintk("NFSD: xdr error (%s:%d)\n", \ 120 __FILE__, __LINE__); \ 121 goto xdr_error; \ 122 } \ 123 p += XDR_QUADLEN(nbytes); \ 124 } while (0) 125 #define COPYMEM(x,nbytes) do { \ 126 memcpy((x), p, nbytes); \ 127 p += XDR_QUADLEN(nbytes); \ 128 } while (0) 129 130 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */ 131 #define READ_BUF(nbytes) do { \ 132 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \ 133 p = argp->p; \ 134 argp->p += XDR_QUADLEN(nbytes); \ 135 } else if (!(p = read_buf(argp, nbytes))) { \ 136 dprintk("NFSD: xdr error (%s:%d)\n", \ 137 __FILE__, __LINE__); \ 138 goto xdr_error; \ 139 } \ 140 } while (0) 141 142 static void next_decode_page(struct nfsd4_compoundargs *argp) 143 { 144 argp->p = page_address(argp->pagelist[0]); 145 argp->pagelist++; 146 if (argp->pagelen < PAGE_SIZE) { 147 argp->end = argp->p + XDR_QUADLEN(argp->pagelen); 148 argp->pagelen = 0; 149 } else { 150 argp->end = argp->p + (PAGE_SIZE>>2); 151 argp->pagelen -= PAGE_SIZE; 152 } 153 } 154 155 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes) 156 { 157 /* We want more bytes than seem to be available. 158 * Maybe we need a new page, maybe we have just run out 159 */ 160 unsigned int avail = (char *)argp->end - (char *)argp->p; 161 __be32 *p; 162 163 if (argp->pagelen == 0) { 164 struct kvec *vec = &argp->rqstp->rq_arg.tail[0]; 165 166 if (!argp->tail) { 167 argp->tail = true; 168 avail = vec->iov_len; 169 argp->p = vec->iov_base; 170 argp->end = vec->iov_base + avail; 171 } 172 173 if (avail < nbytes) 174 return NULL; 175 176 p = argp->p; 177 argp->p += XDR_QUADLEN(nbytes); 178 return p; 179 } 180 181 if (avail + argp->pagelen < nbytes) 182 return NULL; 183 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */ 184 return NULL; 185 /* ok, we can do it with the current plus the next page */ 186 if (nbytes <= sizeof(argp->tmp)) 187 p = argp->tmp; 188 else { 189 kfree(argp->tmpp); 190 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL); 191 if (!p) 192 return NULL; 193 194 } 195 /* 196 * The following memcpy is safe because read_buf is always 197 * called with nbytes > avail, and the two cases above both 198 * guarantee p points to at least nbytes bytes. 199 */ 200 memcpy(p, argp->p, avail); 201 next_decode_page(argp); 202 memcpy(((char*)p)+avail, argp->p, (nbytes - avail)); 203 argp->p += XDR_QUADLEN(nbytes - avail); 204 return p; 205 } 206 207 static int zero_clientid(clientid_t *clid) 208 { 209 return (clid->cl_boot == 0) && (clid->cl_id == 0); 210 } 211 212 /** 213 * svcxdr_tmpalloc - allocate memory to be freed after compound processing 214 * @argp: NFSv4 compound argument structure 215 * @p: pointer to be freed (with kfree()) 216 * 217 * Marks @p to be freed when processing the compound operation 218 * described in @argp finishes. 219 */ 220 static void * 221 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len) 222 { 223 struct svcxdr_tmpbuf *tb; 224 225 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL); 226 if (!tb) 227 return NULL; 228 tb->next = argp->to_free; 229 argp->to_free = tb; 230 return tb->buf; 231 } 232 233 /* 234 * For xdr strings that need to be passed to other kernel api's 235 * as null-terminated strings. 236 * 237 * Note null-terminating in place usually isn't safe since the 238 * buffer might end on a page boundary. 239 */ 240 static char * 241 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len) 242 { 243 char *p = svcxdr_tmpalloc(argp, len + 1); 244 245 if (!p) 246 return NULL; 247 memcpy(p, buf, len); 248 p[len] = '\0'; 249 return p; 250 } 251 252 /** 253 * savemem - duplicate a chunk of memory for later processing 254 * @argp: NFSv4 compound argument structure to be freed with 255 * @p: pointer to be duplicated 256 * @nbytes: length to be duplicated 257 * 258 * Returns a pointer to a copy of @nbytes bytes of memory at @p 259 * that are preserved until processing of the NFSv4 compound 260 * operation described by @argp finishes. 261 */ 262 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes) 263 { 264 void *ret; 265 266 ret = svcxdr_tmpalloc(argp, nbytes); 267 if (!ret) 268 return NULL; 269 memcpy(ret, p, nbytes); 270 return ret; 271 } 272 273 /* 274 * We require the high 32 bits of 'seconds' to be 0, and 275 * we ignore all 32 bits of 'nseconds'. 276 */ 277 static __be32 278 nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv) 279 { 280 DECODE_HEAD; 281 u64 sec; 282 283 READ_BUF(12); 284 p = xdr_decode_hyper(p, &sec); 285 tv->tv_sec = sec; 286 tv->tv_nsec = be32_to_cpup(p++); 287 if (tv->tv_nsec >= (u32)1000000000) 288 return nfserr_inval; 289 290 DECODE_TAIL; 291 } 292 293 static __be32 294 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval) 295 { 296 u32 bmlen; 297 DECODE_HEAD; 298 299 bmval[0] = 0; 300 bmval[1] = 0; 301 bmval[2] = 0; 302 303 READ_BUF(4); 304 bmlen = be32_to_cpup(p++); 305 if (bmlen > 1000) 306 goto xdr_error; 307 308 READ_BUF(bmlen << 2); 309 if (bmlen > 0) 310 bmval[0] = be32_to_cpup(p++); 311 if (bmlen > 1) 312 bmval[1] = be32_to_cpup(p++); 313 if (bmlen > 2) 314 bmval[2] = be32_to_cpup(p++); 315 316 DECODE_TAIL; 317 } 318 319 static __be32 320 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, 321 struct iattr *iattr, struct nfs4_acl **acl, 322 struct xdr_netobj *label, int *umask) 323 { 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, &iattr->ia_atime); 426 if (status) 427 return status; 428 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 429 break; 430 case NFS4_SET_TO_SERVER_TIME: 431 iattr->ia_valid |= ATTR_ATIME; 432 break; 433 default: 434 goto xdr_error; 435 } 436 } 437 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 438 READ_BUF(4); 439 len += 4; 440 dummy32 = be32_to_cpup(p++); 441 switch (dummy32) { 442 case NFS4_SET_TO_CLIENT_TIME: 443 len += 12; 444 status = nfsd4_decode_time(argp, &iattr->ia_mtime); 445 if (status) 446 return status; 447 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 448 break; 449 case NFS4_SET_TO_SERVER_TIME: 450 iattr->ia_valid |= ATTR_MTIME; 451 break; 452 default: 453 goto xdr_error; 454 } 455 } 456 457 label->len = 0; 458 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) && 459 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) { 460 READ_BUF(4); 461 len += 4; 462 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */ 463 READ_BUF(4); 464 len += 4; 465 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */ 466 READ_BUF(4); 467 len += 4; 468 dummy32 = be32_to_cpup(p++); 469 READ_BUF(dummy32); 470 if (dummy32 > NFS4_MAXLABELLEN) 471 return nfserr_badlabel; 472 len += (XDR_QUADLEN(dummy32) << 2); 473 READMEM(buf, dummy32); 474 label->len = dummy32; 475 label->data = svcxdr_dupstr(argp, buf, dummy32); 476 if (!label->data) 477 return nfserr_jukebox; 478 } 479 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) { 480 if (!umask) 481 goto xdr_error; 482 READ_BUF(8); 483 len += 8; 484 dummy32 = be32_to_cpup(p++); 485 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO); 486 dummy32 = be32_to_cpup(p++); 487 *umask = dummy32 & S_IRWXUGO; 488 iattr->ia_valid |= ATTR_MODE; 489 } 490 if (len != expected_len) 491 goto xdr_error; 492 493 DECODE_TAIL; 494 } 495 496 static __be32 497 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid) 498 { 499 DECODE_HEAD; 500 501 READ_BUF(sizeof(stateid_t)); 502 sid->si_generation = be32_to_cpup(p++); 503 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t)); 504 505 DECODE_TAIL; 506 } 507 508 static __be32 509 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access) 510 { 511 DECODE_HEAD; 512 513 READ_BUF(4); 514 access->ac_req_access = be32_to_cpup(p++); 515 516 DECODE_TAIL; 517 } 518 519 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs) 520 { 521 DECODE_HEAD; 522 u32 dummy, uid, gid; 523 char *machine_name; 524 int i; 525 int nr_secflavs; 526 527 /* callback_sec_params4 */ 528 READ_BUF(4); 529 nr_secflavs = be32_to_cpup(p++); 530 if (nr_secflavs) 531 cbs->flavor = (u32)(-1); 532 else 533 /* Is this legal? Be generous, take it to mean AUTH_NONE: */ 534 cbs->flavor = 0; 535 for (i = 0; i < nr_secflavs; ++i) { 536 READ_BUF(4); 537 dummy = be32_to_cpup(p++); 538 switch (dummy) { 539 case RPC_AUTH_NULL: 540 /* Nothing to read */ 541 if (cbs->flavor == (u32)(-1)) 542 cbs->flavor = RPC_AUTH_NULL; 543 break; 544 case RPC_AUTH_UNIX: 545 READ_BUF(8); 546 /* stamp */ 547 dummy = be32_to_cpup(p++); 548 549 /* machine name */ 550 dummy = be32_to_cpup(p++); 551 READ_BUF(dummy); 552 SAVEMEM(machine_name, dummy); 553 554 /* uid, gid */ 555 READ_BUF(8); 556 uid = be32_to_cpup(p++); 557 gid = be32_to_cpup(p++); 558 559 /* more gids */ 560 READ_BUF(4); 561 dummy = be32_to_cpup(p++); 562 READ_BUF(dummy * 4); 563 if (cbs->flavor == (u32)(-1)) { 564 kuid_t kuid = make_kuid(&init_user_ns, uid); 565 kgid_t kgid = make_kgid(&init_user_ns, gid); 566 if (uid_valid(kuid) && gid_valid(kgid)) { 567 cbs->uid = kuid; 568 cbs->gid = kgid; 569 cbs->flavor = RPC_AUTH_UNIX; 570 } else { 571 dprintk("RPC_AUTH_UNIX with invalid" 572 "uid or gid ignoring!\n"); 573 } 574 } 575 break; 576 case RPC_AUTH_GSS: 577 dprintk("RPC_AUTH_GSS callback secflavor " 578 "not supported!\n"); 579 READ_BUF(8); 580 /* gcbp_service */ 581 dummy = be32_to_cpup(p++); 582 /* gcbp_handle_from_server */ 583 dummy = be32_to_cpup(p++); 584 READ_BUF(dummy); 585 p += XDR_QUADLEN(dummy); 586 /* gcbp_handle_from_client */ 587 READ_BUF(4); 588 dummy = be32_to_cpup(p++); 589 READ_BUF(dummy); 590 break; 591 default: 592 dprintk("Illegal callback secflavor\n"); 593 return nfserr_inval; 594 } 595 } 596 DECODE_TAIL; 597 } 598 599 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc) 600 { 601 DECODE_HEAD; 602 603 READ_BUF(4); 604 bc->bc_cb_program = be32_to_cpup(p++); 605 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec); 606 607 DECODE_TAIL; 608 } 609 610 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts) 611 { 612 DECODE_HEAD; 613 614 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8); 615 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN); 616 bcts->dir = be32_to_cpup(p++); 617 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker 618 * could help us figure out we should be using it. */ 619 DECODE_TAIL; 620 } 621 622 static __be32 623 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close) 624 { 625 DECODE_HEAD; 626 627 READ_BUF(4); 628 close->cl_seqid = be32_to_cpup(p++); 629 return nfsd4_decode_stateid(argp, &close->cl_stateid); 630 631 DECODE_TAIL; 632 } 633 634 635 static __be32 636 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit) 637 { 638 DECODE_HEAD; 639 640 READ_BUF(12); 641 p = xdr_decode_hyper(p, &commit->co_offset); 642 commit->co_count = be32_to_cpup(p++); 643 644 DECODE_TAIL; 645 } 646 647 static __be32 648 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) 649 { 650 DECODE_HEAD; 651 652 READ_BUF(4); 653 create->cr_type = be32_to_cpup(p++); 654 switch (create->cr_type) { 655 case NF4LNK: 656 READ_BUF(4); 657 create->cr_datalen = be32_to_cpup(p++); 658 READ_BUF(create->cr_datalen); 659 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen); 660 if (!create->cr_data) 661 return nfserr_jukebox; 662 break; 663 case NF4BLK: 664 case NF4CHR: 665 READ_BUF(8); 666 create->cr_specdata1 = be32_to_cpup(p++); 667 create->cr_specdata2 = be32_to_cpup(p++); 668 break; 669 case NF4SOCK: 670 case NF4FIFO: 671 case NF4DIR: 672 default: 673 break; 674 } 675 676 READ_BUF(4); 677 create->cr_namelen = be32_to_cpup(p++); 678 READ_BUF(create->cr_namelen); 679 SAVEMEM(create->cr_name, create->cr_namelen); 680 if ((status = check_filename(create->cr_name, create->cr_namelen))) 681 return status; 682 683 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, 684 &create->cr_acl, &create->cr_label, 685 ¤t->fs->umask); 686 if (status) 687 goto out; 688 689 DECODE_TAIL; 690 } 691 692 static inline __be32 693 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr) 694 { 695 return nfsd4_decode_stateid(argp, &dr->dr_stateid); 696 } 697 698 static inline __be32 699 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr) 700 { 701 return nfsd4_decode_bitmap(argp, getattr->ga_bmval); 702 } 703 704 static __be32 705 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link) 706 { 707 DECODE_HEAD; 708 709 READ_BUF(4); 710 link->li_namelen = be32_to_cpup(p++); 711 READ_BUF(link->li_namelen); 712 SAVEMEM(link->li_name, link->li_namelen); 713 if ((status = check_filename(link->li_name, link->li_namelen))) 714 return status; 715 716 DECODE_TAIL; 717 } 718 719 static __be32 720 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 721 { 722 DECODE_HEAD; 723 724 /* 725 * type, reclaim(boolean), offset, length, new_lock_owner(boolean) 726 */ 727 READ_BUF(28); 728 lock->lk_type = be32_to_cpup(p++); 729 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 730 goto xdr_error; 731 lock->lk_reclaim = be32_to_cpup(p++); 732 p = xdr_decode_hyper(p, &lock->lk_offset); 733 p = xdr_decode_hyper(p, &lock->lk_length); 734 lock->lk_is_new = be32_to_cpup(p++); 735 736 if (lock->lk_is_new) { 737 READ_BUF(4); 738 lock->lk_new_open_seqid = be32_to_cpup(p++); 739 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid); 740 if (status) 741 return status; 742 READ_BUF(8 + sizeof(clientid_t)); 743 lock->lk_new_lock_seqid = be32_to_cpup(p++); 744 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t)); 745 lock->lk_new_owner.len = be32_to_cpup(p++); 746 READ_BUF(lock->lk_new_owner.len); 747 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len); 748 } else { 749 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid); 750 if (status) 751 return status; 752 READ_BUF(4); 753 lock->lk_old_lock_seqid = be32_to_cpup(p++); 754 } 755 756 DECODE_TAIL; 757 } 758 759 static __be32 760 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt) 761 { 762 DECODE_HEAD; 763 764 READ_BUF(32); 765 lockt->lt_type = be32_to_cpup(p++); 766 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 767 goto xdr_error; 768 p = xdr_decode_hyper(p, &lockt->lt_offset); 769 p = xdr_decode_hyper(p, &lockt->lt_length); 770 COPYMEM(&lockt->lt_clientid, 8); 771 lockt->lt_owner.len = be32_to_cpup(p++); 772 READ_BUF(lockt->lt_owner.len); 773 READMEM(lockt->lt_owner.data, lockt->lt_owner.len); 774 775 DECODE_TAIL; 776 } 777 778 static __be32 779 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku) 780 { 781 DECODE_HEAD; 782 783 READ_BUF(8); 784 locku->lu_type = be32_to_cpup(p++); 785 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 786 goto xdr_error; 787 locku->lu_seqid = be32_to_cpup(p++); 788 status = nfsd4_decode_stateid(argp, &locku->lu_stateid); 789 if (status) 790 return status; 791 READ_BUF(16); 792 p = xdr_decode_hyper(p, &locku->lu_offset); 793 p = xdr_decode_hyper(p, &locku->lu_length); 794 795 DECODE_TAIL; 796 } 797 798 static __be32 799 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup) 800 { 801 DECODE_HEAD; 802 803 READ_BUF(4); 804 lookup->lo_len = be32_to_cpup(p++); 805 READ_BUF(lookup->lo_len); 806 SAVEMEM(lookup->lo_name, lookup->lo_len); 807 if ((status = check_filename(lookup->lo_name, lookup->lo_len))) 808 return status; 809 810 DECODE_TAIL; 811 } 812 813 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when) 814 { 815 __be32 *p; 816 u32 w; 817 818 READ_BUF(4); 819 w = be32_to_cpup(p++); 820 *share_access = w & NFS4_SHARE_ACCESS_MASK; 821 *deleg_want = w & NFS4_SHARE_WANT_MASK; 822 if (deleg_when) 823 *deleg_when = w & NFS4_SHARE_WHEN_MASK; 824 825 switch (w & NFS4_SHARE_ACCESS_MASK) { 826 case NFS4_SHARE_ACCESS_READ: 827 case NFS4_SHARE_ACCESS_WRITE: 828 case NFS4_SHARE_ACCESS_BOTH: 829 break; 830 default: 831 return nfserr_bad_xdr; 832 } 833 w &= ~NFS4_SHARE_ACCESS_MASK; 834 if (!w) 835 return nfs_ok; 836 if (!argp->minorversion) 837 return nfserr_bad_xdr; 838 switch (w & NFS4_SHARE_WANT_MASK) { 839 case NFS4_SHARE_WANT_NO_PREFERENCE: 840 case NFS4_SHARE_WANT_READ_DELEG: 841 case NFS4_SHARE_WANT_WRITE_DELEG: 842 case NFS4_SHARE_WANT_ANY_DELEG: 843 case NFS4_SHARE_WANT_NO_DELEG: 844 case NFS4_SHARE_WANT_CANCEL: 845 break; 846 default: 847 return nfserr_bad_xdr; 848 } 849 w &= ~NFS4_SHARE_WANT_MASK; 850 if (!w) 851 return nfs_ok; 852 853 if (!deleg_when) /* open_downgrade */ 854 return nfserr_inval; 855 switch (w) { 856 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL: 857 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED: 858 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL | 859 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED): 860 return nfs_ok; 861 } 862 xdr_error: 863 return nfserr_bad_xdr; 864 } 865 866 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x) 867 { 868 __be32 *p; 869 870 READ_BUF(4); 871 *x = be32_to_cpup(p++); 872 /* Note: unlinke access bits, deny bits may be zero. */ 873 if (*x & ~NFS4_SHARE_DENY_BOTH) 874 return nfserr_bad_xdr; 875 return nfs_ok; 876 xdr_error: 877 return nfserr_bad_xdr; 878 } 879 880 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o) 881 { 882 __be32 *p; 883 884 READ_BUF(4); 885 o->len = be32_to_cpup(p++); 886 887 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT) 888 return nfserr_bad_xdr; 889 890 READ_BUF(o->len); 891 SAVEMEM(o->data, o->len); 892 return nfs_ok; 893 xdr_error: 894 return nfserr_bad_xdr; 895 } 896 897 static __be32 898 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 899 { 900 DECODE_HEAD; 901 u32 dummy; 902 903 memset(open->op_bmval, 0, sizeof(open->op_bmval)); 904 open->op_iattr.ia_valid = 0; 905 open->op_openowner = NULL; 906 907 open->op_xdr_error = 0; 908 /* seqid, share_access, share_deny, clientid, ownerlen */ 909 READ_BUF(4); 910 open->op_seqid = be32_to_cpup(p++); 911 /* decode, yet ignore deleg_when until supported */ 912 status = nfsd4_decode_share_access(argp, &open->op_share_access, 913 &open->op_deleg_want, &dummy); 914 if (status) 915 goto xdr_error; 916 status = nfsd4_decode_share_deny(argp, &open->op_share_deny); 917 if (status) 918 goto xdr_error; 919 READ_BUF(sizeof(clientid_t)); 920 COPYMEM(&open->op_clientid, sizeof(clientid_t)); 921 status = nfsd4_decode_opaque(argp, &open->op_owner); 922 if (status) 923 goto xdr_error; 924 READ_BUF(4); 925 open->op_create = be32_to_cpup(p++); 926 switch (open->op_create) { 927 case NFS4_OPEN_NOCREATE: 928 break; 929 case NFS4_OPEN_CREATE: 930 current->fs->umask = 0; 931 READ_BUF(4); 932 open->op_createmode = be32_to_cpup(p++); 933 switch (open->op_createmode) { 934 case NFS4_CREATE_UNCHECKED: 935 case NFS4_CREATE_GUARDED: 936 status = nfsd4_decode_fattr(argp, open->op_bmval, 937 &open->op_iattr, &open->op_acl, &open->op_label, 938 ¤t->fs->umask); 939 if (status) 940 goto out; 941 break; 942 case NFS4_CREATE_EXCLUSIVE: 943 READ_BUF(NFS4_VERIFIER_SIZE); 944 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE); 945 break; 946 case NFS4_CREATE_EXCLUSIVE4_1: 947 if (argp->minorversion < 1) 948 goto xdr_error; 949 READ_BUF(NFS4_VERIFIER_SIZE); 950 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE); 951 status = nfsd4_decode_fattr(argp, open->op_bmval, 952 &open->op_iattr, &open->op_acl, &open->op_label, 953 ¤t->fs->umask); 954 if (status) 955 goto out; 956 break; 957 default: 958 goto xdr_error; 959 } 960 break; 961 default: 962 goto xdr_error; 963 } 964 965 /* open_claim */ 966 READ_BUF(4); 967 open->op_claim_type = be32_to_cpup(p++); 968 switch (open->op_claim_type) { 969 case NFS4_OPEN_CLAIM_NULL: 970 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 971 READ_BUF(4); 972 open->op_fname.len = be32_to_cpup(p++); 973 READ_BUF(open->op_fname.len); 974 SAVEMEM(open->op_fname.data, open->op_fname.len); 975 if ((status = check_filename(open->op_fname.data, open->op_fname.len))) 976 return status; 977 break; 978 case NFS4_OPEN_CLAIM_PREVIOUS: 979 READ_BUF(4); 980 open->op_delegate_type = be32_to_cpup(p++); 981 break; 982 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 983 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid); 984 if (status) 985 return status; 986 READ_BUF(4); 987 open->op_fname.len = be32_to_cpup(p++); 988 READ_BUF(open->op_fname.len); 989 SAVEMEM(open->op_fname.data, open->op_fname.len); 990 if ((status = check_filename(open->op_fname.data, open->op_fname.len))) 991 return status; 992 break; 993 case NFS4_OPEN_CLAIM_FH: 994 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 995 if (argp->minorversion < 1) 996 goto xdr_error; 997 /* void */ 998 break; 999 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1000 if (argp->minorversion < 1) 1001 goto xdr_error; 1002 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid); 1003 if (status) 1004 return status; 1005 break; 1006 default: 1007 goto xdr_error; 1008 } 1009 1010 DECODE_TAIL; 1011 } 1012 1013 static __be32 1014 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf) 1015 { 1016 DECODE_HEAD; 1017 1018 if (argp->minorversion >= 1) 1019 return nfserr_notsupp; 1020 1021 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid); 1022 if (status) 1023 return status; 1024 READ_BUF(4); 1025 open_conf->oc_seqid = be32_to_cpup(p++); 1026 1027 DECODE_TAIL; 1028 } 1029 1030 static __be32 1031 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down) 1032 { 1033 DECODE_HEAD; 1034 1035 status = nfsd4_decode_stateid(argp, &open_down->od_stateid); 1036 if (status) 1037 return status; 1038 READ_BUF(4); 1039 open_down->od_seqid = be32_to_cpup(p++); 1040 status = nfsd4_decode_share_access(argp, &open_down->od_share_access, 1041 &open_down->od_deleg_want, NULL); 1042 if (status) 1043 return status; 1044 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny); 1045 if (status) 1046 return status; 1047 DECODE_TAIL; 1048 } 1049 1050 static __be32 1051 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh) 1052 { 1053 DECODE_HEAD; 1054 1055 READ_BUF(4); 1056 putfh->pf_fhlen = be32_to_cpup(p++); 1057 if (putfh->pf_fhlen > NFS4_FHSIZE) 1058 goto xdr_error; 1059 READ_BUF(putfh->pf_fhlen); 1060 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen); 1061 1062 DECODE_TAIL; 1063 } 1064 1065 static __be32 1066 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p) 1067 { 1068 if (argp->minorversion == 0) 1069 return nfs_ok; 1070 return nfserr_notsupp; 1071 } 1072 1073 static __be32 1074 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read) 1075 { 1076 DECODE_HEAD; 1077 1078 status = nfsd4_decode_stateid(argp, &read->rd_stateid); 1079 if (status) 1080 return status; 1081 READ_BUF(12); 1082 p = xdr_decode_hyper(p, &read->rd_offset); 1083 read->rd_length = be32_to_cpup(p++); 1084 1085 DECODE_TAIL; 1086 } 1087 1088 static __be32 1089 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir) 1090 { 1091 DECODE_HEAD; 1092 1093 READ_BUF(24); 1094 p = xdr_decode_hyper(p, &readdir->rd_cookie); 1095 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data)); 1096 readdir->rd_dircount = be32_to_cpup(p++); 1097 readdir->rd_maxcount = be32_to_cpup(p++); 1098 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval))) 1099 goto out; 1100 1101 DECODE_TAIL; 1102 } 1103 1104 static __be32 1105 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove) 1106 { 1107 DECODE_HEAD; 1108 1109 READ_BUF(4); 1110 remove->rm_namelen = be32_to_cpup(p++); 1111 READ_BUF(remove->rm_namelen); 1112 SAVEMEM(remove->rm_name, remove->rm_namelen); 1113 if ((status = check_filename(remove->rm_name, remove->rm_namelen))) 1114 return status; 1115 1116 DECODE_TAIL; 1117 } 1118 1119 static __be32 1120 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename) 1121 { 1122 DECODE_HEAD; 1123 1124 READ_BUF(4); 1125 rename->rn_snamelen = be32_to_cpup(p++); 1126 READ_BUF(rename->rn_snamelen); 1127 SAVEMEM(rename->rn_sname, rename->rn_snamelen); 1128 READ_BUF(4); 1129 rename->rn_tnamelen = be32_to_cpup(p++); 1130 READ_BUF(rename->rn_tnamelen); 1131 SAVEMEM(rename->rn_tname, rename->rn_tnamelen); 1132 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen))) 1133 return status; 1134 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen))) 1135 return status; 1136 1137 DECODE_TAIL; 1138 } 1139 1140 static __be32 1141 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid) 1142 { 1143 DECODE_HEAD; 1144 1145 if (argp->minorversion >= 1) 1146 return nfserr_notsupp; 1147 1148 READ_BUF(sizeof(clientid_t)); 1149 COPYMEM(clientid, sizeof(clientid_t)); 1150 1151 DECODE_TAIL; 1152 } 1153 1154 static __be32 1155 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp, 1156 struct nfsd4_secinfo *secinfo) 1157 { 1158 DECODE_HEAD; 1159 1160 READ_BUF(4); 1161 secinfo->si_namelen = be32_to_cpup(p++); 1162 READ_BUF(secinfo->si_namelen); 1163 SAVEMEM(secinfo->si_name, secinfo->si_namelen); 1164 status = check_filename(secinfo->si_name, secinfo->si_namelen); 1165 if (status) 1166 return status; 1167 DECODE_TAIL; 1168 } 1169 1170 static __be32 1171 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp, 1172 struct nfsd4_secinfo_no_name *sin) 1173 { 1174 DECODE_HEAD; 1175 1176 READ_BUF(4); 1177 sin->sin_style = be32_to_cpup(p++); 1178 DECODE_TAIL; 1179 } 1180 1181 static __be32 1182 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr) 1183 { 1184 __be32 status; 1185 1186 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid); 1187 if (status) 1188 return status; 1189 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, 1190 &setattr->sa_acl, &setattr->sa_label, NULL); 1191 } 1192 1193 static __be32 1194 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid) 1195 { 1196 DECODE_HEAD; 1197 1198 if (argp->minorversion >= 1) 1199 return nfserr_notsupp; 1200 1201 READ_BUF(NFS4_VERIFIER_SIZE); 1202 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE); 1203 1204 status = nfsd4_decode_opaque(argp, &setclientid->se_name); 1205 if (status) 1206 return nfserr_bad_xdr; 1207 READ_BUF(8); 1208 setclientid->se_callback_prog = be32_to_cpup(p++); 1209 setclientid->se_callback_netid_len = be32_to_cpup(p++); 1210 READ_BUF(setclientid->se_callback_netid_len); 1211 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len); 1212 READ_BUF(4); 1213 setclientid->se_callback_addr_len = be32_to_cpup(p++); 1214 1215 READ_BUF(setclientid->se_callback_addr_len); 1216 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len); 1217 READ_BUF(4); 1218 setclientid->se_callback_ident = be32_to_cpup(p++); 1219 1220 DECODE_TAIL; 1221 } 1222 1223 static __be32 1224 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c) 1225 { 1226 DECODE_HEAD; 1227 1228 if (argp->minorversion >= 1) 1229 return nfserr_notsupp; 1230 1231 READ_BUF(8 + NFS4_VERIFIER_SIZE); 1232 COPYMEM(&scd_c->sc_clientid, 8); 1233 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE); 1234 1235 DECODE_TAIL; 1236 } 1237 1238 /* Also used for NVERIFY */ 1239 static __be32 1240 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify) 1241 { 1242 DECODE_HEAD; 1243 1244 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval))) 1245 goto out; 1246 1247 /* For convenience's sake, we compare raw xdr'd attributes in 1248 * nfsd4_proc_verify */ 1249 1250 READ_BUF(4); 1251 verify->ve_attrlen = be32_to_cpup(p++); 1252 READ_BUF(verify->ve_attrlen); 1253 SAVEMEM(verify->ve_attrval, verify->ve_attrlen); 1254 1255 DECODE_TAIL; 1256 } 1257 1258 static __be32 1259 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) 1260 { 1261 int avail; 1262 int len; 1263 DECODE_HEAD; 1264 1265 status = nfsd4_decode_stateid(argp, &write->wr_stateid); 1266 if (status) 1267 return status; 1268 READ_BUF(16); 1269 p = xdr_decode_hyper(p, &write->wr_offset); 1270 write->wr_stable_how = be32_to_cpup(p++); 1271 if (write->wr_stable_how > NFS_FILE_SYNC) 1272 goto xdr_error; 1273 write->wr_buflen = be32_to_cpup(p++); 1274 1275 /* Sorry .. no magic macros for this.. * 1276 * READ_BUF(write->wr_buflen); 1277 * SAVEMEM(write->wr_buf, write->wr_buflen); 1278 */ 1279 avail = (char*)argp->end - (char*)argp->p; 1280 if (avail + argp->pagelen < write->wr_buflen) { 1281 dprintk("NFSD: xdr error (%s:%d)\n", 1282 __FILE__, __LINE__); 1283 goto xdr_error; 1284 } 1285 write->wr_head.iov_base = p; 1286 write->wr_head.iov_len = avail; 1287 write->wr_pagelist = argp->pagelist; 1288 1289 len = XDR_QUADLEN(write->wr_buflen) << 2; 1290 if (len >= avail) { 1291 int pages; 1292 1293 len -= avail; 1294 1295 pages = len >> PAGE_SHIFT; 1296 argp->pagelist += pages; 1297 argp->pagelen -= pages * PAGE_SIZE; 1298 len -= pages * PAGE_SIZE; 1299 1300 next_decode_page(argp); 1301 } 1302 argp->p += XDR_QUADLEN(len); 1303 1304 DECODE_TAIL; 1305 } 1306 1307 static __be32 1308 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner) 1309 { 1310 DECODE_HEAD; 1311 1312 if (argp->minorversion >= 1) 1313 return nfserr_notsupp; 1314 1315 READ_BUF(12); 1316 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t)); 1317 rlockowner->rl_owner.len = be32_to_cpup(p++); 1318 READ_BUF(rlockowner->rl_owner.len); 1319 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len); 1320 1321 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid)) 1322 return nfserr_inval; 1323 DECODE_TAIL; 1324 } 1325 1326 static __be32 1327 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp, 1328 struct nfsd4_exchange_id *exid) 1329 { 1330 int dummy, tmp; 1331 DECODE_HEAD; 1332 1333 READ_BUF(NFS4_VERIFIER_SIZE); 1334 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE); 1335 1336 status = nfsd4_decode_opaque(argp, &exid->clname); 1337 if (status) 1338 return nfserr_bad_xdr; 1339 1340 READ_BUF(4); 1341 exid->flags = be32_to_cpup(p++); 1342 1343 /* Ignore state_protect4_a */ 1344 READ_BUF(4); 1345 exid->spa_how = be32_to_cpup(p++); 1346 switch (exid->spa_how) { 1347 case SP4_NONE: 1348 break; 1349 case SP4_MACH_CRED: 1350 /* spo_must_enforce */ 1351 status = nfsd4_decode_bitmap(argp, 1352 exid->spo_must_enforce); 1353 if (status) 1354 goto out; 1355 /* spo_must_allow */ 1356 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow); 1357 if (status) 1358 goto out; 1359 break; 1360 case SP4_SSV: 1361 /* ssp_ops */ 1362 READ_BUF(4); 1363 dummy = be32_to_cpup(p++); 1364 READ_BUF(dummy * 4); 1365 p += dummy; 1366 1367 READ_BUF(4); 1368 dummy = be32_to_cpup(p++); 1369 READ_BUF(dummy * 4); 1370 p += dummy; 1371 1372 /* ssp_hash_algs<> */ 1373 READ_BUF(4); 1374 tmp = be32_to_cpup(p++); 1375 while (tmp--) { 1376 READ_BUF(4); 1377 dummy = be32_to_cpup(p++); 1378 READ_BUF(dummy); 1379 p += XDR_QUADLEN(dummy); 1380 } 1381 1382 /* ssp_encr_algs<> */ 1383 READ_BUF(4); 1384 tmp = be32_to_cpup(p++); 1385 while (tmp--) { 1386 READ_BUF(4); 1387 dummy = be32_to_cpup(p++); 1388 READ_BUF(dummy); 1389 p += XDR_QUADLEN(dummy); 1390 } 1391 1392 /* ssp_window and ssp_num_gss_handles */ 1393 READ_BUF(8); 1394 dummy = be32_to_cpup(p++); 1395 dummy = be32_to_cpup(p++); 1396 break; 1397 default: 1398 goto xdr_error; 1399 } 1400 1401 /* Ignore Implementation ID */ 1402 READ_BUF(4); /* nfs_impl_id4 array length */ 1403 dummy = be32_to_cpup(p++); 1404 1405 if (dummy > 1) 1406 goto xdr_error; 1407 1408 if (dummy == 1) { 1409 /* nii_domain */ 1410 READ_BUF(4); 1411 dummy = be32_to_cpup(p++); 1412 READ_BUF(dummy); 1413 p += XDR_QUADLEN(dummy); 1414 1415 /* nii_name */ 1416 READ_BUF(4); 1417 dummy = be32_to_cpup(p++); 1418 READ_BUF(dummy); 1419 p += XDR_QUADLEN(dummy); 1420 1421 /* nii_date */ 1422 READ_BUF(12); 1423 p += 3; 1424 } 1425 DECODE_TAIL; 1426 } 1427 1428 static __be32 1429 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, 1430 struct nfsd4_create_session *sess) 1431 { 1432 DECODE_HEAD; 1433 u32 dummy; 1434 1435 READ_BUF(16); 1436 COPYMEM(&sess->clientid, 8); 1437 sess->seqid = be32_to_cpup(p++); 1438 sess->flags = be32_to_cpup(p++); 1439 1440 /* Fore channel attrs */ 1441 READ_BUF(28); 1442 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */ 1443 sess->fore_channel.maxreq_sz = be32_to_cpup(p++); 1444 sess->fore_channel.maxresp_sz = be32_to_cpup(p++); 1445 sess->fore_channel.maxresp_cached = be32_to_cpup(p++); 1446 sess->fore_channel.maxops = be32_to_cpup(p++); 1447 sess->fore_channel.maxreqs = be32_to_cpup(p++); 1448 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++); 1449 if (sess->fore_channel.nr_rdma_attrs == 1) { 1450 READ_BUF(4); 1451 sess->fore_channel.rdma_attrs = be32_to_cpup(p++); 1452 } else if (sess->fore_channel.nr_rdma_attrs > 1) { 1453 dprintk("Too many fore channel attr bitmaps!\n"); 1454 goto xdr_error; 1455 } 1456 1457 /* Back channel attrs */ 1458 READ_BUF(28); 1459 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */ 1460 sess->back_channel.maxreq_sz = be32_to_cpup(p++); 1461 sess->back_channel.maxresp_sz = be32_to_cpup(p++); 1462 sess->back_channel.maxresp_cached = be32_to_cpup(p++); 1463 sess->back_channel.maxops = be32_to_cpup(p++); 1464 sess->back_channel.maxreqs = be32_to_cpup(p++); 1465 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++); 1466 if (sess->back_channel.nr_rdma_attrs == 1) { 1467 READ_BUF(4); 1468 sess->back_channel.rdma_attrs = be32_to_cpup(p++); 1469 } else if (sess->back_channel.nr_rdma_attrs > 1) { 1470 dprintk("Too many back channel attr bitmaps!\n"); 1471 goto xdr_error; 1472 } 1473 1474 READ_BUF(4); 1475 sess->callback_prog = be32_to_cpup(p++); 1476 nfsd4_decode_cb_sec(argp, &sess->cb_sec); 1477 DECODE_TAIL; 1478 } 1479 1480 static __be32 1481 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp, 1482 struct nfsd4_destroy_session *destroy_session) 1483 { 1484 DECODE_HEAD; 1485 READ_BUF(NFS4_MAX_SESSIONID_LEN); 1486 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN); 1487 1488 DECODE_TAIL; 1489 } 1490 1491 static __be32 1492 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp, 1493 struct nfsd4_free_stateid *free_stateid) 1494 { 1495 DECODE_HEAD; 1496 1497 READ_BUF(sizeof(stateid_t)); 1498 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++); 1499 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t)); 1500 1501 DECODE_TAIL; 1502 } 1503 1504 static __be32 1505 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp, 1506 struct nfsd4_sequence *seq) 1507 { 1508 DECODE_HEAD; 1509 1510 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); 1511 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN); 1512 seq->seqid = be32_to_cpup(p++); 1513 seq->slotid = be32_to_cpup(p++); 1514 seq->maxslots = be32_to_cpup(p++); 1515 seq->cachethis = be32_to_cpup(p++); 1516 1517 DECODE_TAIL; 1518 } 1519 1520 static __be32 1521 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid) 1522 { 1523 int i; 1524 __be32 *p, status; 1525 struct nfsd4_test_stateid_id *stateid; 1526 1527 READ_BUF(4); 1528 test_stateid->ts_num_ids = ntohl(*p++); 1529 1530 INIT_LIST_HEAD(&test_stateid->ts_stateid_list); 1531 1532 for (i = 0; i < test_stateid->ts_num_ids; i++) { 1533 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); 1534 if (!stateid) { 1535 status = nfserrno(-ENOMEM); 1536 goto out; 1537 } 1538 1539 INIT_LIST_HEAD(&stateid->ts_id_list); 1540 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); 1541 1542 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid); 1543 if (status) 1544 goto out; 1545 } 1546 1547 status = 0; 1548 out: 1549 return status; 1550 xdr_error: 1551 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__); 1552 status = nfserr_bad_xdr; 1553 goto out; 1554 } 1555 1556 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc) 1557 { 1558 DECODE_HEAD; 1559 1560 READ_BUF(8); 1561 COPYMEM(&dc->clientid, 8); 1562 1563 DECODE_TAIL; 1564 } 1565 1566 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc) 1567 { 1568 DECODE_HEAD; 1569 1570 READ_BUF(4); 1571 rc->rca_one_fs = be32_to_cpup(p++); 1572 1573 DECODE_TAIL; 1574 } 1575 1576 #ifdef CONFIG_NFSD_PNFS 1577 static __be32 1578 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp, 1579 struct nfsd4_getdeviceinfo *gdev) 1580 { 1581 DECODE_HEAD; 1582 u32 num, i; 1583 1584 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4); 1585 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid)); 1586 gdev->gd_layout_type = be32_to_cpup(p++); 1587 gdev->gd_maxcount = be32_to_cpup(p++); 1588 num = be32_to_cpup(p++); 1589 if (num) { 1590 READ_BUF(4 * num); 1591 gdev->gd_notify_types = be32_to_cpup(p++); 1592 for (i = 1; i < num; i++) { 1593 if (be32_to_cpup(p++)) { 1594 status = nfserr_inval; 1595 goto out; 1596 } 1597 } 1598 } 1599 DECODE_TAIL; 1600 } 1601 1602 static __be32 1603 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp, 1604 struct nfsd4_layoutget *lgp) 1605 { 1606 DECODE_HEAD; 1607 1608 READ_BUF(36); 1609 lgp->lg_signal = be32_to_cpup(p++); 1610 lgp->lg_layout_type = be32_to_cpup(p++); 1611 lgp->lg_seg.iomode = be32_to_cpup(p++); 1612 p = xdr_decode_hyper(p, &lgp->lg_seg.offset); 1613 p = xdr_decode_hyper(p, &lgp->lg_seg.length); 1614 p = xdr_decode_hyper(p, &lgp->lg_minlength); 1615 1616 status = nfsd4_decode_stateid(argp, &lgp->lg_sid); 1617 if (status) 1618 return status; 1619 1620 READ_BUF(4); 1621 lgp->lg_maxcount = be32_to_cpup(p++); 1622 1623 DECODE_TAIL; 1624 } 1625 1626 static __be32 1627 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp, 1628 struct nfsd4_layoutcommit *lcp) 1629 { 1630 DECODE_HEAD; 1631 u32 timechange; 1632 1633 READ_BUF(20); 1634 p = xdr_decode_hyper(p, &lcp->lc_seg.offset); 1635 p = xdr_decode_hyper(p, &lcp->lc_seg.length); 1636 lcp->lc_reclaim = be32_to_cpup(p++); 1637 1638 status = nfsd4_decode_stateid(argp, &lcp->lc_sid); 1639 if (status) 1640 return status; 1641 1642 READ_BUF(4); 1643 lcp->lc_newoffset = be32_to_cpup(p++); 1644 if (lcp->lc_newoffset) { 1645 READ_BUF(8); 1646 p = xdr_decode_hyper(p, &lcp->lc_last_wr); 1647 } else 1648 lcp->lc_last_wr = 0; 1649 READ_BUF(4); 1650 timechange = be32_to_cpup(p++); 1651 if (timechange) { 1652 status = nfsd4_decode_time(argp, &lcp->lc_mtime); 1653 if (status) 1654 return status; 1655 } else { 1656 lcp->lc_mtime.tv_nsec = UTIME_NOW; 1657 } 1658 READ_BUF(8); 1659 lcp->lc_layout_type = be32_to_cpup(p++); 1660 1661 /* 1662 * Save the layout update in XDR format and let the layout driver deal 1663 * with it later. 1664 */ 1665 lcp->lc_up_len = be32_to_cpup(p++); 1666 if (lcp->lc_up_len > 0) { 1667 READ_BUF(lcp->lc_up_len); 1668 READMEM(lcp->lc_up_layout, lcp->lc_up_len); 1669 } 1670 1671 DECODE_TAIL; 1672 } 1673 1674 static __be32 1675 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp, 1676 struct nfsd4_layoutreturn *lrp) 1677 { 1678 DECODE_HEAD; 1679 1680 READ_BUF(16); 1681 lrp->lr_reclaim = be32_to_cpup(p++); 1682 lrp->lr_layout_type = be32_to_cpup(p++); 1683 lrp->lr_seg.iomode = be32_to_cpup(p++); 1684 lrp->lr_return_type = be32_to_cpup(p++); 1685 if (lrp->lr_return_type == RETURN_FILE) { 1686 READ_BUF(16); 1687 p = xdr_decode_hyper(p, &lrp->lr_seg.offset); 1688 p = xdr_decode_hyper(p, &lrp->lr_seg.length); 1689 1690 status = nfsd4_decode_stateid(argp, &lrp->lr_sid); 1691 if (status) 1692 return status; 1693 1694 READ_BUF(4); 1695 lrp->lrf_body_len = be32_to_cpup(p++); 1696 if (lrp->lrf_body_len > 0) { 1697 READ_BUF(lrp->lrf_body_len); 1698 READMEM(lrp->lrf_body, lrp->lrf_body_len); 1699 } 1700 } else { 1701 lrp->lr_seg.offset = 0; 1702 lrp->lr_seg.length = NFS4_MAX_UINT64; 1703 } 1704 1705 DECODE_TAIL; 1706 } 1707 #endif /* CONFIG_NFSD_PNFS */ 1708 1709 static __be32 1710 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp, 1711 struct nfsd4_fallocate *fallocate) 1712 { 1713 DECODE_HEAD; 1714 1715 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid); 1716 if (status) 1717 return status; 1718 1719 READ_BUF(16); 1720 p = xdr_decode_hyper(p, &fallocate->falloc_offset); 1721 xdr_decode_hyper(p, &fallocate->falloc_length); 1722 1723 DECODE_TAIL; 1724 } 1725 1726 static __be32 1727 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone) 1728 { 1729 DECODE_HEAD; 1730 1731 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid); 1732 if (status) 1733 return status; 1734 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid); 1735 if (status) 1736 return status; 1737 1738 READ_BUF(8 + 8 + 8); 1739 p = xdr_decode_hyper(p, &clone->cl_src_pos); 1740 p = xdr_decode_hyper(p, &clone->cl_dst_pos); 1741 p = xdr_decode_hyper(p, &clone->cl_count); 1742 DECODE_TAIL; 1743 } 1744 1745 static __be32 1746 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy) 1747 { 1748 DECODE_HEAD; 1749 unsigned int tmp; 1750 1751 status = nfsd4_decode_stateid(argp, ©->cp_src_stateid); 1752 if (status) 1753 return status; 1754 status = nfsd4_decode_stateid(argp, ©->cp_dst_stateid); 1755 if (status) 1756 return status; 1757 1758 READ_BUF(8 + 8 + 8 + 4 + 4 + 4); 1759 p = xdr_decode_hyper(p, ©->cp_src_pos); 1760 p = xdr_decode_hyper(p, ©->cp_dst_pos); 1761 p = xdr_decode_hyper(p, ©->cp_count); 1762 copy->cp_consecutive = be32_to_cpup(p++); 1763 copy->cp_synchronous = be32_to_cpup(p++); 1764 tmp = be32_to_cpup(p); /* Source server list not supported */ 1765 1766 DECODE_TAIL; 1767 } 1768 1769 static __be32 1770 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek) 1771 { 1772 DECODE_HEAD; 1773 1774 status = nfsd4_decode_stateid(argp, &seek->seek_stateid); 1775 if (status) 1776 return status; 1777 1778 READ_BUF(8 + 4); 1779 p = xdr_decode_hyper(p, &seek->seek_offset); 1780 seek->seek_whence = be32_to_cpup(p); 1781 1782 DECODE_TAIL; 1783 } 1784 1785 static __be32 1786 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p) 1787 { 1788 return nfs_ok; 1789 } 1790 1791 static __be32 1792 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p) 1793 { 1794 return nfserr_notsupp; 1795 } 1796 1797 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *); 1798 1799 static const nfsd4_dec nfsd4_dec_ops[] = { 1800 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access, 1801 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close, 1802 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit, 1803 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create, 1804 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp, 1805 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn, 1806 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr, 1807 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop, 1808 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link, 1809 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock, 1810 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt, 1811 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku, 1812 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup, 1813 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop, 1814 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify, 1815 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open, 1816 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp, 1817 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm, 1818 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade, 1819 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh, 1820 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh, 1821 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop, 1822 [OP_READ] = (nfsd4_dec)nfsd4_decode_read, 1823 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir, 1824 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop, 1825 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove, 1826 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename, 1827 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew, 1828 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop, 1829 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop, 1830 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo, 1831 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr, 1832 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid, 1833 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm, 1834 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify, 1835 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write, 1836 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner, 1837 1838 /* new operations for NFSv4.1 */ 1839 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl, 1840 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session, 1841 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id, 1842 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session, 1843 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session, 1844 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid, 1845 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 1846 #ifdef CONFIG_NFSD_PNFS 1847 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo, 1848 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 1849 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit, 1850 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget, 1851 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn, 1852 #else 1853 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp, 1854 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 1855 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp, 1856 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp, 1857 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp, 1858 #endif 1859 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name, 1860 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence, 1861 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp, 1862 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid, 1863 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 1864 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid, 1865 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete, 1866 1867 /* new operations for NFSv4.2 */ 1868 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 1869 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy, 1870 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp, 1871 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate, 1872 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp, 1873 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp, 1874 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp, 1875 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp, 1876 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp, 1877 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp, 1878 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek, 1879 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp, 1880 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone, 1881 }; 1882 1883 static inline bool 1884 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op) 1885 { 1886 if (op->opnum < FIRST_NFS4_OP) 1887 return false; 1888 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP) 1889 return false; 1890 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP) 1891 return false; 1892 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP) 1893 return false; 1894 return true; 1895 } 1896 1897 static __be32 1898 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 1899 { 1900 DECODE_HEAD; 1901 struct nfsd4_op *op; 1902 bool cachethis = false; 1903 int auth_slack= argp->rqstp->rq_auth_slack; 1904 int max_reply = auth_slack + 8; /* opcnt, status */ 1905 int readcount = 0; 1906 int readbytes = 0; 1907 int i; 1908 1909 READ_BUF(4); 1910 argp->taglen = be32_to_cpup(p++); 1911 READ_BUF(argp->taglen); 1912 SAVEMEM(argp->tag, argp->taglen); 1913 READ_BUF(8); 1914 argp->minorversion = be32_to_cpup(p++); 1915 argp->opcnt = be32_to_cpup(p++); 1916 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2); 1917 1918 if (argp->taglen > NFSD4_MAX_TAGLEN) 1919 goto xdr_error; 1920 /* 1921 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS 1922 * here, so we return success at the xdr level so that 1923 * nfsd4_proc can handle this is an NFS-level error. 1924 */ 1925 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND) 1926 return 0; 1927 1928 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { 1929 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); 1930 if (!argp->ops) { 1931 argp->ops = argp->iops; 1932 dprintk("nfsd: couldn't allocate room for COMPOUND\n"); 1933 goto xdr_error; 1934 } 1935 } 1936 1937 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 1938 argp->opcnt = 0; 1939 1940 for (i = 0; i < argp->opcnt; i++) { 1941 op = &argp->ops[i]; 1942 op->replay = NULL; 1943 1944 READ_BUF(4); 1945 op->opnum = be32_to_cpup(p++); 1946 1947 if (nfsd4_opnum_in_range(argp, op)) 1948 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u); 1949 else { 1950 op->opnum = OP_ILLEGAL; 1951 op->status = nfserr_op_illegal; 1952 } 1953 op->opdesc = OPDESC(op); 1954 /* 1955 * We'll try to cache the result in the DRC if any one 1956 * op in the compound wants to be cached: 1957 */ 1958 cachethis |= nfsd4_cache_this_op(op); 1959 1960 if (op->opnum == OP_READ) { 1961 readcount++; 1962 readbytes += nfsd4_max_reply(argp->rqstp, op); 1963 } else 1964 max_reply += nfsd4_max_reply(argp->rqstp, op); 1965 /* 1966 * OP_LOCK and OP_LOCKT may return a conflicting lock. 1967 * (Special case because it will just skip encoding this 1968 * if it runs out of xdr buffer space, and it is the only 1969 * operation that behaves this way.) 1970 */ 1971 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT) 1972 max_reply += NFS4_OPAQUE_LIMIT; 1973 1974 if (op->status) { 1975 argp->opcnt = i+1; 1976 break; 1977 } 1978 } 1979 /* Sessions make the DRC unnecessary: */ 1980 if (argp->minorversion) 1981 cachethis = false; 1982 svc_reserve(argp->rqstp, max_reply + readbytes); 1983 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE; 1984 1985 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack) 1986 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags); 1987 1988 DECODE_TAIL; 1989 } 1990 1991 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode, 1992 struct svc_export *exp) 1993 { 1994 if (exp->ex_flags & NFSEXP_V4ROOT) { 1995 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time)); 1996 *p++ = 0; 1997 } else if (IS_I_VERSION(inode)) { 1998 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode)); 1999 } else { 2000 *p++ = cpu_to_be32(stat->ctime.tv_sec); 2001 *p++ = cpu_to_be32(stat->ctime.tv_nsec); 2002 } 2003 return p; 2004 } 2005 2006 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c) 2007 { 2008 *p++ = cpu_to_be32(c->atomic); 2009 if (c->change_supported) { 2010 p = xdr_encode_hyper(p, c->before_change); 2011 p = xdr_encode_hyper(p, c->after_change); 2012 } else { 2013 *p++ = cpu_to_be32(c->before_ctime_sec); 2014 *p++ = cpu_to_be32(c->before_ctime_nsec); 2015 *p++ = cpu_to_be32(c->after_ctime_sec); 2016 *p++ = cpu_to_be32(c->after_ctime_nsec); 2017 } 2018 return p; 2019 } 2020 2021 /* Encode as an array of strings the string given with components 2022 * separated @sep, escaped with esc_enter and esc_exit. 2023 */ 2024 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep, 2025 char *components, char esc_enter, 2026 char esc_exit) 2027 { 2028 __be32 *p; 2029 __be32 pathlen; 2030 int pathlen_offset; 2031 int strlen, count=0; 2032 char *str, *end, *next; 2033 2034 dprintk("nfsd4_encode_components(%s)\n", components); 2035 2036 pathlen_offset = xdr->buf->len; 2037 p = xdr_reserve_space(xdr, 4); 2038 if (!p) 2039 return nfserr_resource; 2040 p++; /* We will fill this in with @count later */ 2041 2042 end = str = components; 2043 while (*end) { 2044 bool found_esc = false; 2045 2046 /* try to parse as esc_start, ..., esc_end, sep */ 2047 if (*str == esc_enter) { 2048 for (; *end && (*end != esc_exit); end++) 2049 /* find esc_exit or end of string */; 2050 next = end + 1; 2051 if (*end && (!*next || *next == sep)) { 2052 str++; 2053 found_esc = true; 2054 } 2055 } 2056 2057 if (!found_esc) 2058 for (; *end && (*end != sep); end++) 2059 /* find sep or end of string */; 2060 2061 strlen = end - str; 2062 if (strlen) { 2063 p = xdr_reserve_space(xdr, strlen + 4); 2064 if (!p) 2065 return nfserr_resource; 2066 p = xdr_encode_opaque(p, str, strlen); 2067 count++; 2068 } 2069 else 2070 end++; 2071 if (found_esc) 2072 end = next; 2073 2074 str = end; 2075 } 2076 pathlen = htonl(count); 2077 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4); 2078 return 0; 2079 } 2080 2081 /* Encode as an array of strings the string given with components 2082 * separated @sep. 2083 */ 2084 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep, 2085 char *components) 2086 { 2087 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0); 2088 } 2089 2090 /* 2091 * encode a location element of a fs_locations structure 2092 */ 2093 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr, 2094 struct nfsd4_fs_location *location) 2095 { 2096 __be32 status; 2097 2098 status = nfsd4_encode_components_esc(xdr, ':', location->hosts, 2099 '[', ']'); 2100 if (status) 2101 return status; 2102 status = nfsd4_encode_components(xdr, '/', location->path); 2103 if (status) 2104 return status; 2105 return 0; 2106 } 2107 2108 /* 2109 * Encode a path in RFC3530 'pathname4' format 2110 */ 2111 static __be32 nfsd4_encode_path(struct xdr_stream *xdr, 2112 const struct path *root, 2113 const struct path *path) 2114 { 2115 struct path cur = *path; 2116 __be32 *p; 2117 struct dentry **components = NULL; 2118 unsigned int ncomponents = 0; 2119 __be32 err = nfserr_jukebox; 2120 2121 dprintk("nfsd4_encode_components("); 2122 2123 path_get(&cur); 2124 /* First walk the path up to the nfsd root, and store the 2125 * dentries/path components in an array. 2126 */ 2127 for (;;) { 2128 if (path_equal(&cur, root)) 2129 break; 2130 if (cur.dentry == cur.mnt->mnt_root) { 2131 if (follow_up(&cur)) 2132 continue; 2133 goto out_free; 2134 } 2135 if ((ncomponents & 15) == 0) { 2136 struct dentry **new; 2137 new = krealloc(components, 2138 sizeof(*new) * (ncomponents + 16), 2139 GFP_KERNEL); 2140 if (!new) 2141 goto out_free; 2142 components = new; 2143 } 2144 components[ncomponents++] = cur.dentry; 2145 cur.dentry = dget_parent(cur.dentry); 2146 } 2147 err = nfserr_resource; 2148 p = xdr_reserve_space(xdr, 4); 2149 if (!p) 2150 goto out_free; 2151 *p++ = cpu_to_be32(ncomponents); 2152 2153 while (ncomponents) { 2154 struct dentry *dentry = components[ncomponents - 1]; 2155 unsigned int len; 2156 2157 spin_lock(&dentry->d_lock); 2158 len = dentry->d_name.len; 2159 p = xdr_reserve_space(xdr, len + 4); 2160 if (!p) { 2161 spin_unlock(&dentry->d_lock); 2162 goto out_free; 2163 } 2164 p = xdr_encode_opaque(p, dentry->d_name.name, len); 2165 dprintk("/%pd", dentry); 2166 spin_unlock(&dentry->d_lock); 2167 dput(dentry); 2168 ncomponents--; 2169 } 2170 2171 err = 0; 2172 out_free: 2173 dprintk(")\n"); 2174 while (ncomponents) 2175 dput(components[--ncomponents]); 2176 kfree(components); 2177 path_put(&cur); 2178 return err; 2179 } 2180 2181 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr, 2182 struct svc_rqst *rqstp, const struct path *path) 2183 { 2184 struct svc_export *exp_ps; 2185 __be32 res; 2186 2187 exp_ps = rqst_find_fsidzero_export(rqstp); 2188 if (IS_ERR(exp_ps)) 2189 return nfserrno(PTR_ERR(exp_ps)); 2190 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path); 2191 exp_put(exp_ps); 2192 return res; 2193 } 2194 2195 /* 2196 * encode a fs_locations structure 2197 */ 2198 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr, 2199 struct svc_rqst *rqstp, struct svc_export *exp) 2200 { 2201 __be32 status; 2202 int i; 2203 __be32 *p; 2204 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; 2205 2206 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path); 2207 if (status) 2208 return status; 2209 p = xdr_reserve_space(xdr, 4); 2210 if (!p) 2211 return nfserr_resource; 2212 *p++ = cpu_to_be32(fslocs->locations_count); 2213 for (i=0; i<fslocs->locations_count; i++) { 2214 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]); 2215 if (status) 2216 return status; 2217 } 2218 return 0; 2219 } 2220 2221 static u32 nfs4_file_type(umode_t mode) 2222 { 2223 switch (mode & S_IFMT) { 2224 case S_IFIFO: return NF4FIFO; 2225 case S_IFCHR: return NF4CHR; 2226 case S_IFDIR: return NF4DIR; 2227 case S_IFBLK: return NF4BLK; 2228 case S_IFLNK: return NF4LNK; 2229 case S_IFREG: return NF4REG; 2230 case S_IFSOCK: return NF4SOCK; 2231 default: return NF4BAD; 2232 }; 2233 } 2234 2235 static inline __be32 2236 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2237 struct nfs4_ace *ace) 2238 { 2239 if (ace->whotype != NFS4_ACL_WHO_NAMED) 2240 return nfs4_acl_write_who(xdr, ace->whotype); 2241 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 2242 return nfsd4_encode_group(xdr, rqstp, ace->who_gid); 2243 else 2244 return nfsd4_encode_user(xdr, rqstp, ace->who_uid); 2245 } 2246 2247 static inline __be32 2248 nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types) 2249 { 2250 __be32 *p; 2251 unsigned long i = hweight_long(layout_types); 2252 2253 p = xdr_reserve_space(xdr, 4 + 4 * i); 2254 if (!p) 2255 return nfserr_resource; 2256 2257 *p++ = cpu_to_be32(i); 2258 2259 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i) 2260 if (layout_types & (1 << i)) 2261 *p++ = cpu_to_be32(i); 2262 2263 return 0; 2264 } 2265 2266 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ 2267 FATTR4_WORD0_RDATTR_ERROR) 2268 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID 2269 #define WORD2_ABSENT_FS_ATTRS 0 2270 2271 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2272 static inline __be32 2273 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2274 void *context, int len) 2275 { 2276 __be32 *p; 2277 2278 p = xdr_reserve_space(xdr, len + 4 + 4 + 4); 2279 if (!p) 2280 return nfserr_resource; 2281 2282 /* 2283 * For now we use a 0 here to indicate the null translation; in 2284 * the future we may place a call to translation code here. 2285 */ 2286 *p++ = cpu_to_be32(0); /* lfs */ 2287 *p++ = cpu_to_be32(0); /* pi */ 2288 p = xdr_encode_opaque(p, context, len); 2289 return 0; 2290 } 2291 #else 2292 static inline __be32 2293 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 2294 void *context, int len) 2295 { return 0; } 2296 #endif 2297 2298 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err) 2299 { 2300 /* As per referral draft: */ 2301 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || 2302 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { 2303 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || 2304 *bmval0 & FATTR4_WORD0_FS_LOCATIONS) 2305 *rdattr_err = NFSERR_MOVED; 2306 else 2307 return nfserr_moved; 2308 } 2309 *bmval0 &= WORD0_ABSENT_FS_ATTRS; 2310 *bmval1 &= WORD1_ABSENT_FS_ATTRS; 2311 *bmval2 &= WORD2_ABSENT_FS_ATTRS; 2312 return 0; 2313 } 2314 2315 2316 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat) 2317 { 2318 struct path path = exp->ex_path; 2319 int err; 2320 2321 path_get(&path); 2322 while (follow_up(&path)) { 2323 if (path.dentry != path.mnt->mnt_root) 2324 break; 2325 } 2326 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2327 path_put(&path); 2328 return err; 2329 } 2330 2331 static __be32 2332 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2) 2333 { 2334 __be32 *p; 2335 2336 if (bmval2) { 2337 p = xdr_reserve_space(xdr, 16); 2338 if (!p) 2339 goto out_resource; 2340 *p++ = cpu_to_be32(3); 2341 *p++ = cpu_to_be32(bmval0); 2342 *p++ = cpu_to_be32(bmval1); 2343 *p++ = cpu_to_be32(bmval2); 2344 } else if (bmval1) { 2345 p = xdr_reserve_space(xdr, 12); 2346 if (!p) 2347 goto out_resource; 2348 *p++ = cpu_to_be32(2); 2349 *p++ = cpu_to_be32(bmval0); 2350 *p++ = cpu_to_be32(bmval1); 2351 } else { 2352 p = xdr_reserve_space(xdr, 8); 2353 if (!p) 2354 goto out_resource; 2355 *p++ = cpu_to_be32(1); 2356 *p++ = cpu_to_be32(bmval0); 2357 } 2358 2359 return 0; 2360 out_resource: 2361 return nfserr_resource; 2362 } 2363 2364 /* 2365 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 2366 * ourselves. 2367 */ 2368 static __be32 2369 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, 2370 struct svc_export *exp, 2371 struct dentry *dentry, u32 *bmval, 2372 struct svc_rqst *rqstp, int ignore_crossmnt) 2373 { 2374 u32 bmval0 = bmval[0]; 2375 u32 bmval1 = bmval[1]; 2376 u32 bmval2 = bmval[2]; 2377 struct kstat stat; 2378 struct svc_fh *tempfh = NULL; 2379 struct kstatfs statfs; 2380 __be32 *p; 2381 int starting_len = xdr->buf->len; 2382 int attrlen_offset; 2383 __be32 attrlen; 2384 u32 dummy; 2385 u64 dummy64; 2386 u32 rdattr_err = 0; 2387 __be32 status; 2388 int err; 2389 struct nfs4_acl *acl = NULL; 2390 void *context = NULL; 2391 int contextlen; 2392 bool contextsupport = false; 2393 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2394 u32 minorversion = resp->cstate.minorversion; 2395 struct path path = { 2396 .mnt = exp->ex_path.mnt, 2397 .dentry = dentry, 2398 }; 2399 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2400 2401 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); 2402 BUG_ON(!nfsd_attrs_supported(minorversion, bmval)); 2403 2404 if (exp->ex_fslocs.migrated) { 2405 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err); 2406 if (status) 2407 goto out; 2408 } 2409 2410 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); 2411 if (err) 2412 goto out_nfserr; 2413 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE | 2414 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || 2415 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 2416 FATTR4_WORD1_SPACE_TOTAL))) { 2417 err = vfs_statfs(&path, &statfs); 2418 if (err) 2419 goto out_nfserr; 2420 } 2421 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { 2422 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); 2423 status = nfserr_jukebox; 2424 if (!tempfh) 2425 goto out; 2426 fh_init(tempfh, NFS4_FHSIZE); 2427 status = fh_compose(tempfh, exp, dentry, NULL); 2428 if (status) 2429 goto out; 2430 fhp = tempfh; 2431 } 2432 if (bmval0 & FATTR4_WORD0_ACL) { 2433 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); 2434 if (err == -EOPNOTSUPP) 2435 bmval0 &= ~FATTR4_WORD0_ACL; 2436 else if (err == -EINVAL) { 2437 status = nfserr_attrnotsupp; 2438 goto out; 2439 } else if (err != 0) 2440 goto out_nfserr; 2441 } 2442 2443 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2444 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) || 2445 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2446 if (exp->ex_flags & NFSEXP_SECURITY_LABEL) 2447 err = security_inode_getsecctx(d_inode(dentry), 2448 &context, &contextlen); 2449 else 2450 err = -EOPNOTSUPP; 2451 contextsupport = (err == 0); 2452 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2453 if (err == -EOPNOTSUPP) 2454 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL; 2455 else if (err) 2456 goto out_nfserr; 2457 } 2458 } 2459 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2460 2461 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2); 2462 if (status) 2463 goto out; 2464 2465 attrlen_offset = xdr->buf->len; 2466 p = xdr_reserve_space(xdr, 4); 2467 if (!p) 2468 goto out_resource; 2469 p++; /* to be backfilled later */ 2470 2471 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2472 u32 supp[3]; 2473 2474 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2475 2476 if (!IS_POSIXACL(dentry->d_inode)) 2477 supp[0] &= ~FATTR4_WORD0_ACL; 2478 if (!contextsupport) 2479 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 2480 if (!supp[2]) { 2481 p = xdr_reserve_space(xdr, 12); 2482 if (!p) 2483 goto out_resource; 2484 *p++ = cpu_to_be32(2); 2485 *p++ = cpu_to_be32(supp[0]); 2486 *p++ = cpu_to_be32(supp[1]); 2487 } else { 2488 p = xdr_reserve_space(xdr, 16); 2489 if (!p) 2490 goto out_resource; 2491 *p++ = cpu_to_be32(3); 2492 *p++ = cpu_to_be32(supp[0]); 2493 *p++ = cpu_to_be32(supp[1]); 2494 *p++ = cpu_to_be32(supp[2]); 2495 } 2496 } 2497 if (bmval0 & FATTR4_WORD0_TYPE) { 2498 p = xdr_reserve_space(xdr, 4); 2499 if (!p) 2500 goto out_resource; 2501 dummy = nfs4_file_type(stat.mode); 2502 if (dummy == NF4BAD) { 2503 status = nfserr_serverfault; 2504 goto out; 2505 } 2506 *p++ = cpu_to_be32(dummy); 2507 } 2508 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { 2509 p = xdr_reserve_space(xdr, 4); 2510 if (!p) 2511 goto out_resource; 2512 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 2513 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT); 2514 else 2515 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT| 2516 NFS4_FH_VOL_RENAME); 2517 } 2518 if (bmval0 & FATTR4_WORD0_CHANGE) { 2519 p = xdr_reserve_space(xdr, 8); 2520 if (!p) 2521 goto out_resource; 2522 p = encode_change(p, &stat, d_inode(dentry), exp); 2523 } 2524 if (bmval0 & FATTR4_WORD0_SIZE) { 2525 p = xdr_reserve_space(xdr, 8); 2526 if (!p) 2527 goto out_resource; 2528 p = xdr_encode_hyper(p, stat.size); 2529 } 2530 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { 2531 p = xdr_reserve_space(xdr, 4); 2532 if (!p) 2533 goto out_resource; 2534 *p++ = cpu_to_be32(1); 2535 } 2536 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { 2537 p = xdr_reserve_space(xdr, 4); 2538 if (!p) 2539 goto out_resource; 2540 *p++ = cpu_to_be32(1); 2541 } 2542 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { 2543 p = xdr_reserve_space(xdr, 4); 2544 if (!p) 2545 goto out_resource; 2546 *p++ = cpu_to_be32(0); 2547 } 2548 if (bmval0 & FATTR4_WORD0_FSID) { 2549 p = xdr_reserve_space(xdr, 16); 2550 if (!p) 2551 goto out_resource; 2552 if (exp->ex_fslocs.migrated) { 2553 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR); 2554 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR); 2555 } else switch(fsid_source(fhp)) { 2556 case FSIDSOURCE_FSID: 2557 p = xdr_encode_hyper(p, (u64)exp->ex_fsid); 2558 p = xdr_encode_hyper(p, (u64)0); 2559 break; 2560 case FSIDSOURCE_DEV: 2561 *p++ = cpu_to_be32(0); 2562 *p++ = cpu_to_be32(MAJOR(stat.dev)); 2563 *p++ = cpu_to_be32(0); 2564 *p++ = cpu_to_be32(MINOR(stat.dev)); 2565 break; 2566 case FSIDSOURCE_UUID: 2567 p = xdr_encode_opaque_fixed(p, exp->ex_uuid, 2568 EX_UUID_LEN); 2569 break; 2570 } 2571 } 2572 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { 2573 p = xdr_reserve_space(xdr, 4); 2574 if (!p) 2575 goto out_resource; 2576 *p++ = cpu_to_be32(0); 2577 } 2578 if (bmval0 & FATTR4_WORD0_LEASE_TIME) { 2579 p = xdr_reserve_space(xdr, 4); 2580 if (!p) 2581 goto out_resource; 2582 *p++ = cpu_to_be32(nn->nfsd4_lease); 2583 } 2584 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { 2585 p = xdr_reserve_space(xdr, 4); 2586 if (!p) 2587 goto out_resource; 2588 *p++ = cpu_to_be32(rdattr_err); 2589 } 2590 if (bmval0 & FATTR4_WORD0_ACL) { 2591 struct nfs4_ace *ace; 2592 2593 if (acl == NULL) { 2594 p = xdr_reserve_space(xdr, 4); 2595 if (!p) 2596 goto out_resource; 2597 2598 *p++ = cpu_to_be32(0); 2599 goto out_acl; 2600 } 2601 p = xdr_reserve_space(xdr, 4); 2602 if (!p) 2603 goto out_resource; 2604 *p++ = cpu_to_be32(acl->naces); 2605 2606 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 2607 p = xdr_reserve_space(xdr, 4*3); 2608 if (!p) 2609 goto out_resource; 2610 *p++ = cpu_to_be32(ace->type); 2611 *p++ = cpu_to_be32(ace->flag); 2612 *p++ = cpu_to_be32(ace->access_mask & 2613 NFS4_ACE_MASK_ALL); 2614 status = nfsd4_encode_aclname(xdr, rqstp, ace); 2615 if (status) 2616 goto out; 2617 } 2618 } 2619 out_acl: 2620 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { 2621 p = xdr_reserve_space(xdr, 4); 2622 if (!p) 2623 goto out_resource; 2624 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ? 2625 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); 2626 } 2627 if (bmval0 & FATTR4_WORD0_CANSETTIME) { 2628 p = xdr_reserve_space(xdr, 4); 2629 if (!p) 2630 goto out_resource; 2631 *p++ = cpu_to_be32(1); 2632 } 2633 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { 2634 p = xdr_reserve_space(xdr, 4); 2635 if (!p) 2636 goto out_resource; 2637 *p++ = cpu_to_be32(0); 2638 } 2639 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { 2640 p = xdr_reserve_space(xdr, 4); 2641 if (!p) 2642 goto out_resource; 2643 *p++ = cpu_to_be32(1); 2644 } 2645 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { 2646 p = xdr_reserve_space(xdr, 4); 2647 if (!p) 2648 goto out_resource; 2649 *p++ = cpu_to_be32(1); 2650 } 2651 if (bmval0 & FATTR4_WORD0_FILEHANDLE) { 2652 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4); 2653 if (!p) 2654 goto out_resource; 2655 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, 2656 fhp->fh_handle.fh_size); 2657 } 2658 if (bmval0 & FATTR4_WORD0_FILEID) { 2659 p = xdr_reserve_space(xdr, 8); 2660 if (!p) 2661 goto out_resource; 2662 p = xdr_encode_hyper(p, stat.ino); 2663 } 2664 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { 2665 p = xdr_reserve_space(xdr, 8); 2666 if (!p) 2667 goto out_resource; 2668 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 2669 } 2670 if (bmval0 & FATTR4_WORD0_FILES_FREE) { 2671 p = xdr_reserve_space(xdr, 8); 2672 if (!p) 2673 goto out_resource; 2674 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 2675 } 2676 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { 2677 p = xdr_reserve_space(xdr, 8); 2678 if (!p) 2679 goto out_resource; 2680 p = xdr_encode_hyper(p, (u64) statfs.f_files); 2681 } 2682 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) { 2683 status = nfsd4_encode_fs_locations(xdr, rqstp, exp); 2684 if (status) 2685 goto out; 2686 } 2687 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { 2688 p = xdr_reserve_space(xdr, 4); 2689 if (!p) 2690 goto out_resource; 2691 *p++ = cpu_to_be32(1); 2692 } 2693 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { 2694 p = xdr_reserve_space(xdr, 8); 2695 if (!p) 2696 goto out_resource; 2697 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes); 2698 } 2699 if (bmval0 & FATTR4_WORD0_MAXLINK) { 2700 p = xdr_reserve_space(xdr, 4); 2701 if (!p) 2702 goto out_resource; 2703 *p++ = cpu_to_be32(255); 2704 } 2705 if (bmval0 & FATTR4_WORD0_MAXNAME) { 2706 p = xdr_reserve_space(xdr, 4); 2707 if (!p) 2708 goto out_resource; 2709 *p++ = cpu_to_be32(statfs.f_namelen); 2710 } 2711 if (bmval0 & FATTR4_WORD0_MAXREAD) { 2712 p = xdr_reserve_space(xdr, 8); 2713 if (!p) 2714 goto out_resource; 2715 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 2716 } 2717 if (bmval0 & FATTR4_WORD0_MAXWRITE) { 2718 p = xdr_reserve_space(xdr, 8); 2719 if (!p) 2720 goto out_resource; 2721 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 2722 } 2723 if (bmval1 & FATTR4_WORD1_MODE) { 2724 p = xdr_reserve_space(xdr, 4); 2725 if (!p) 2726 goto out_resource; 2727 *p++ = cpu_to_be32(stat.mode & S_IALLUGO); 2728 } 2729 if (bmval1 & FATTR4_WORD1_NO_TRUNC) { 2730 p = xdr_reserve_space(xdr, 4); 2731 if (!p) 2732 goto out_resource; 2733 *p++ = cpu_to_be32(1); 2734 } 2735 if (bmval1 & FATTR4_WORD1_NUMLINKS) { 2736 p = xdr_reserve_space(xdr, 4); 2737 if (!p) 2738 goto out_resource; 2739 *p++ = cpu_to_be32(stat.nlink); 2740 } 2741 if (bmval1 & FATTR4_WORD1_OWNER) { 2742 status = nfsd4_encode_user(xdr, rqstp, stat.uid); 2743 if (status) 2744 goto out; 2745 } 2746 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { 2747 status = nfsd4_encode_group(xdr, rqstp, stat.gid); 2748 if (status) 2749 goto out; 2750 } 2751 if (bmval1 & FATTR4_WORD1_RAWDEV) { 2752 p = xdr_reserve_space(xdr, 8); 2753 if (!p) 2754 goto out_resource; 2755 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev)); 2756 *p++ = cpu_to_be32((u32) MINOR(stat.rdev)); 2757 } 2758 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { 2759 p = xdr_reserve_space(xdr, 8); 2760 if (!p) 2761 goto out_resource; 2762 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; 2763 p = xdr_encode_hyper(p, dummy64); 2764 } 2765 if (bmval1 & FATTR4_WORD1_SPACE_FREE) { 2766 p = xdr_reserve_space(xdr, 8); 2767 if (!p) 2768 goto out_resource; 2769 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; 2770 p = xdr_encode_hyper(p, dummy64); 2771 } 2772 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { 2773 p = xdr_reserve_space(xdr, 8); 2774 if (!p) 2775 goto out_resource; 2776 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; 2777 p = xdr_encode_hyper(p, dummy64); 2778 } 2779 if (bmval1 & FATTR4_WORD1_SPACE_USED) { 2780 p = xdr_reserve_space(xdr, 8); 2781 if (!p) 2782 goto out_resource; 2783 dummy64 = (u64)stat.blocks << 9; 2784 p = xdr_encode_hyper(p, dummy64); 2785 } 2786 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { 2787 p = xdr_reserve_space(xdr, 12); 2788 if (!p) 2789 goto out_resource; 2790 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec); 2791 *p++ = cpu_to_be32(stat.atime.tv_nsec); 2792 } 2793 if (bmval1 & FATTR4_WORD1_TIME_DELTA) { 2794 p = xdr_reserve_space(xdr, 12); 2795 if (!p) 2796 goto out_resource; 2797 *p++ = cpu_to_be32(0); 2798 *p++ = cpu_to_be32(1); 2799 *p++ = cpu_to_be32(0); 2800 } 2801 if (bmval1 & FATTR4_WORD1_TIME_METADATA) { 2802 p = xdr_reserve_space(xdr, 12); 2803 if (!p) 2804 goto out_resource; 2805 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec); 2806 *p++ = cpu_to_be32(stat.ctime.tv_nsec); 2807 } 2808 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { 2809 p = xdr_reserve_space(xdr, 12); 2810 if (!p) 2811 goto out_resource; 2812 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec); 2813 *p++ = cpu_to_be32(stat.mtime.tv_nsec); 2814 } 2815 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { 2816 struct kstat parent_stat; 2817 u64 ino = stat.ino; 2818 2819 p = xdr_reserve_space(xdr, 8); 2820 if (!p) 2821 goto out_resource; 2822 /* 2823 * Get parent's attributes if not ignoring crossmount 2824 * and this is the root of a cross-mounted filesystem. 2825 */ 2826 if (ignore_crossmnt == 0 && 2827 dentry == exp->ex_path.mnt->mnt_root) { 2828 err = get_parent_attributes(exp, &parent_stat); 2829 if (err) 2830 goto out_nfserr; 2831 ino = parent_stat.ino; 2832 } 2833 p = xdr_encode_hyper(p, ino); 2834 } 2835 #ifdef CONFIG_NFSD_PNFS 2836 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) { 2837 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 2838 if (status) 2839 goto out; 2840 } 2841 2842 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) { 2843 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types); 2844 if (status) 2845 goto out; 2846 } 2847 2848 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) { 2849 p = xdr_reserve_space(xdr, 4); 2850 if (!p) 2851 goto out_resource; 2852 *p++ = cpu_to_be32(stat.blksize); 2853 } 2854 #endif /* CONFIG_NFSD_PNFS */ 2855 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) { 2856 u32 supp[3]; 2857 2858 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp)); 2859 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0; 2860 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1; 2861 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2; 2862 2863 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]); 2864 if (status) 2865 goto out; 2866 } 2867 2868 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2869 status = nfsd4_encode_security_label(xdr, rqstp, context, 2870 contextlen); 2871 if (status) 2872 goto out; 2873 } 2874 2875 attrlen = htonl(xdr->buf->len - attrlen_offset - 4); 2876 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4); 2877 status = nfs_ok; 2878 2879 out: 2880 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2881 if (context) 2882 security_release_secctx(context, contextlen); 2883 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2884 kfree(acl); 2885 if (tempfh) { 2886 fh_put(tempfh); 2887 kfree(tempfh); 2888 } 2889 if (status) 2890 xdr_truncate_encode(xdr, starting_len); 2891 return status; 2892 out_nfserr: 2893 status = nfserrno(err); 2894 goto out; 2895 out_resource: 2896 status = nfserr_resource; 2897 goto out; 2898 } 2899 2900 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, 2901 struct xdr_buf *buf, __be32 *p, int bytes) 2902 { 2903 xdr->scratch.iov_len = 0; 2904 memset(buf, 0, sizeof(struct xdr_buf)); 2905 buf->head[0].iov_base = p; 2906 buf->head[0].iov_len = 0; 2907 buf->len = 0; 2908 xdr->buf = buf; 2909 xdr->iov = buf->head; 2910 xdr->p = p; 2911 xdr->end = (void *)p + bytes; 2912 buf->buflen = bytes; 2913 } 2914 2915 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, 2916 struct svc_fh *fhp, struct svc_export *exp, 2917 struct dentry *dentry, u32 *bmval, 2918 struct svc_rqst *rqstp, int ignore_crossmnt) 2919 { 2920 struct xdr_buf dummy; 2921 struct xdr_stream xdr; 2922 __be32 ret; 2923 2924 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); 2925 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp, 2926 ignore_crossmnt); 2927 *p = xdr.p; 2928 return ret; 2929 } 2930 2931 static inline int attributes_need_mount(u32 *bmval) 2932 { 2933 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) 2934 return 1; 2935 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) 2936 return 1; 2937 return 0; 2938 } 2939 2940 static __be32 2941 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd, 2942 const char *name, int namlen) 2943 { 2944 struct svc_export *exp = cd->rd_fhp->fh_export; 2945 struct dentry *dentry; 2946 __be32 nfserr; 2947 int ignore_crossmnt = 0; 2948 2949 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen); 2950 if (IS_ERR(dentry)) 2951 return nfserrno(PTR_ERR(dentry)); 2952 if (d_really_is_negative(dentry)) { 2953 /* 2954 * we're not holding the i_mutex here, so there's 2955 * a window where this directory entry could have gone 2956 * away. 2957 */ 2958 dput(dentry); 2959 return nfserr_noent; 2960 } 2961 2962 exp_get(exp); 2963 /* 2964 * In the case of a mountpoint, the client may be asking for 2965 * attributes that are only properties of the underlying filesystem 2966 * as opposed to the cross-mounted file system. In such a case, 2967 * we will not follow the cross mount and will fill the attribtutes 2968 * directly from the mountpoint dentry. 2969 */ 2970 if (nfsd_mountpoint(dentry, exp)) { 2971 int err; 2972 2973 if (!(exp->ex_flags & NFSEXP_V4ROOT) 2974 && !attributes_need_mount(cd->rd_bmval)) { 2975 ignore_crossmnt = 1; 2976 goto out_encode; 2977 } 2978 /* 2979 * Why the heck aren't we just using nfsd_lookup?? 2980 * Different "."/".." handling? Something else? 2981 * At least, add a comment here to explain.... 2982 */ 2983 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); 2984 if (err) { 2985 nfserr = nfserrno(err); 2986 goto out_put; 2987 } 2988 nfserr = check_nfsd_access(exp, cd->rd_rqstp); 2989 if (nfserr) 2990 goto out_put; 2991 2992 } 2993 out_encode: 2994 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval, 2995 cd->rd_rqstp, ignore_crossmnt); 2996 out_put: 2997 dput(dentry); 2998 exp_put(exp); 2999 return nfserr; 3000 } 3001 3002 static __be32 * 3003 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr) 3004 { 3005 __be32 *p; 3006 3007 p = xdr_reserve_space(xdr, 20); 3008 if (!p) 3009 return NULL; 3010 *p++ = htonl(2); 3011 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ 3012 *p++ = htonl(0); /* bmval1 */ 3013 3014 *p++ = htonl(4); /* attribute length */ 3015 *p++ = nfserr; /* no htonl */ 3016 return p; 3017 } 3018 3019 static int 3020 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen, 3021 loff_t offset, u64 ino, unsigned int d_type) 3022 { 3023 struct readdir_cd *ccd = ccdv; 3024 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 3025 struct xdr_stream *xdr = cd->xdr; 3026 int start_offset = xdr->buf->len; 3027 int cookie_offset; 3028 u32 name_and_cookie; 3029 int entry_bytes; 3030 __be32 nfserr = nfserr_toosmall; 3031 __be64 wire_offset; 3032 __be32 *p; 3033 3034 /* In nfsv4, "." and ".." never make it onto the wire.. */ 3035 if (name && isdotent(name, namlen)) { 3036 cd->common.err = nfs_ok; 3037 return 0; 3038 } 3039 3040 if (cd->cookie_offset) { 3041 wire_offset = cpu_to_be64(offset); 3042 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset, 3043 &wire_offset, 8); 3044 } 3045 3046 p = xdr_reserve_space(xdr, 4); 3047 if (!p) 3048 goto fail; 3049 *p++ = xdr_one; /* mark entry present */ 3050 cookie_offset = xdr->buf->len; 3051 p = xdr_reserve_space(xdr, 3*4 + namlen); 3052 if (!p) 3053 goto fail; 3054 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */ 3055 p = xdr_encode_array(p, name, namlen); /* name length & name */ 3056 3057 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen); 3058 switch (nfserr) { 3059 case nfs_ok: 3060 break; 3061 case nfserr_resource: 3062 nfserr = nfserr_toosmall; 3063 goto fail; 3064 case nfserr_noent: 3065 xdr_truncate_encode(xdr, start_offset); 3066 goto skip_entry; 3067 default: 3068 /* 3069 * If the client requested the RDATTR_ERROR attribute, 3070 * we stuff the error code into this attribute 3071 * and continue. If this attribute was not requested, 3072 * then in accordance with the spec, we fail the 3073 * entire READDIR operation(!) 3074 */ 3075 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 3076 goto fail; 3077 p = nfsd4_encode_rdattr_error(xdr, nfserr); 3078 if (p == NULL) { 3079 nfserr = nfserr_toosmall; 3080 goto fail; 3081 } 3082 } 3083 nfserr = nfserr_toosmall; 3084 entry_bytes = xdr->buf->len - start_offset; 3085 if (entry_bytes > cd->rd_maxcount) 3086 goto fail; 3087 cd->rd_maxcount -= entry_bytes; 3088 /* 3089 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so 3090 * let's always let through the first entry, at least: 3091 */ 3092 if (!cd->rd_dircount) 3093 goto fail; 3094 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8; 3095 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset) 3096 goto fail; 3097 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie); 3098 3099 cd->cookie_offset = cookie_offset; 3100 skip_entry: 3101 cd->common.err = nfs_ok; 3102 return 0; 3103 fail: 3104 xdr_truncate_encode(xdr, start_offset); 3105 cd->common.err = nfserr; 3106 return -EINVAL; 3107 } 3108 3109 static __be32 3110 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid) 3111 { 3112 __be32 *p; 3113 3114 p = xdr_reserve_space(xdr, sizeof(stateid_t)); 3115 if (!p) 3116 return nfserr_resource; 3117 *p++ = cpu_to_be32(sid->si_generation); 3118 p = xdr_encode_opaque_fixed(p, &sid->si_opaque, 3119 sizeof(stateid_opaque_t)); 3120 return 0; 3121 } 3122 3123 static __be32 3124 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access) 3125 { 3126 struct xdr_stream *xdr = &resp->xdr; 3127 __be32 *p; 3128 3129 p = xdr_reserve_space(xdr, 8); 3130 if (!p) 3131 return nfserr_resource; 3132 *p++ = cpu_to_be32(access->ac_supported); 3133 *p++ = cpu_to_be32(access->ac_resp_access); 3134 return 0; 3135 } 3136 3137 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts) 3138 { 3139 struct xdr_stream *xdr = &resp->xdr; 3140 __be32 *p; 3141 3142 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8); 3143 if (!p) 3144 return nfserr_resource; 3145 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data, 3146 NFS4_MAX_SESSIONID_LEN); 3147 *p++ = cpu_to_be32(bcts->dir); 3148 /* Upshifting from TCP to RDMA is not supported */ 3149 *p++ = cpu_to_be32(0); 3150 return 0; 3151 } 3152 3153 static __be32 3154 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close) 3155 { 3156 struct xdr_stream *xdr = &resp->xdr; 3157 3158 return nfsd4_encode_stateid(xdr, &close->cl_stateid); 3159 } 3160 3161 3162 static __be32 3163 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit) 3164 { 3165 struct xdr_stream *xdr = &resp->xdr; 3166 __be32 *p; 3167 3168 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3169 if (!p) 3170 return nfserr_resource; 3171 p = xdr_encode_opaque_fixed(p, commit->co_verf.data, 3172 NFS4_VERIFIER_SIZE); 3173 return 0; 3174 } 3175 3176 static __be32 3177 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create) 3178 { 3179 struct xdr_stream *xdr = &resp->xdr; 3180 __be32 *p; 3181 3182 p = xdr_reserve_space(xdr, 20); 3183 if (!p) 3184 return nfserr_resource; 3185 encode_cinfo(p, &create->cr_cinfo); 3186 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0], 3187 create->cr_bmval[1], create->cr_bmval[2]); 3188 return 0; 3189 } 3190 3191 static __be32 3192 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr) 3193 { 3194 struct svc_fh *fhp = getattr->ga_fhp; 3195 struct xdr_stream *xdr = &resp->xdr; 3196 3197 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry, 3198 getattr->ga_bmval, resp->rqstp, 0); 3199 } 3200 3201 static __be32 3202 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp) 3203 { 3204 struct xdr_stream *xdr = &resp->xdr; 3205 struct svc_fh *fhp = *fhpp; 3206 unsigned int len; 3207 __be32 *p; 3208 3209 len = fhp->fh_handle.fh_size; 3210 p = xdr_reserve_space(xdr, len + 4); 3211 if (!p) 3212 return nfserr_resource; 3213 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len); 3214 return 0; 3215 } 3216 3217 /* 3218 * Including all fields other than the name, a LOCK4denied structure requires 3219 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. 3220 */ 3221 static __be32 3222 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld) 3223 { 3224 struct xdr_netobj *conf = &ld->ld_owner; 3225 __be32 *p; 3226 3227 again: 3228 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len)); 3229 if (!p) { 3230 /* 3231 * Don't fail to return the result just because we can't 3232 * return the conflicting open: 3233 */ 3234 if (conf->len) { 3235 kfree(conf->data); 3236 conf->len = 0; 3237 conf->data = NULL; 3238 goto again; 3239 } 3240 return nfserr_resource; 3241 } 3242 p = xdr_encode_hyper(p, ld->ld_start); 3243 p = xdr_encode_hyper(p, ld->ld_length); 3244 *p++ = cpu_to_be32(ld->ld_type); 3245 if (conf->len) { 3246 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8); 3247 p = xdr_encode_opaque(p, conf->data, conf->len); 3248 kfree(conf->data); 3249 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ 3250 p = xdr_encode_hyper(p, (u64)0); /* clientid */ 3251 *p++ = cpu_to_be32(0); /* length of owner name */ 3252 } 3253 return nfserr_denied; 3254 } 3255 3256 static __be32 3257 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock) 3258 { 3259 struct xdr_stream *xdr = &resp->xdr; 3260 3261 if (!nfserr) 3262 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid); 3263 else if (nfserr == nfserr_denied) 3264 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied); 3265 3266 return nfserr; 3267 } 3268 3269 static __be32 3270 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt) 3271 { 3272 struct xdr_stream *xdr = &resp->xdr; 3273 3274 if (nfserr == nfserr_denied) 3275 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied); 3276 return nfserr; 3277 } 3278 3279 static __be32 3280 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku) 3281 { 3282 struct xdr_stream *xdr = &resp->xdr; 3283 3284 return nfsd4_encode_stateid(xdr, &locku->lu_stateid); 3285 } 3286 3287 3288 static __be32 3289 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link) 3290 { 3291 struct xdr_stream *xdr = &resp->xdr; 3292 __be32 *p; 3293 3294 p = xdr_reserve_space(xdr, 20); 3295 if (!p) 3296 return nfserr_resource; 3297 p = encode_cinfo(p, &link->li_cinfo); 3298 return 0; 3299 } 3300 3301 3302 static __be32 3303 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open) 3304 { 3305 struct xdr_stream *xdr = &resp->xdr; 3306 __be32 *p; 3307 3308 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid); 3309 if (nfserr) 3310 return nfserr; 3311 p = xdr_reserve_space(xdr, 24); 3312 if (!p) 3313 return nfserr_resource; 3314 p = encode_cinfo(p, &open->op_cinfo); 3315 *p++ = cpu_to_be32(open->op_rflags); 3316 3317 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1], 3318 open->op_bmval[2]); 3319 if (nfserr) 3320 return nfserr; 3321 3322 p = xdr_reserve_space(xdr, 4); 3323 if (!p) 3324 return nfserr_resource; 3325 3326 *p++ = cpu_to_be32(open->op_delegate_type); 3327 switch (open->op_delegate_type) { 3328 case NFS4_OPEN_DELEGATE_NONE: 3329 break; 3330 case NFS4_OPEN_DELEGATE_READ: 3331 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3332 if (nfserr) 3333 return nfserr; 3334 p = xdr_reserve_space(xdr, 20); 3335 if (!p) 3336 return nfserr_resource; 3337 *p++ = cpu_to_be32(open->op_recall); 3338 3339 /* 3340 * TODO: ACE's in delegations 3341 */ 3342 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3343 *p++ = cpu_to_be32(0); 3344 *p++ = cpu_to_be32(0); 3345 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3346 break; 3347 case NFS4_OPEN_DELEGATE_WRITE: 3348 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3349 if (nfserr) 3350 return nfserr; 3351 p = xdr_reserve_space(xdr, 32); 3352 if (!p) 3353 return nfserr_resource; 3354 *p++ = cpu_to_be32(0); 3355 3356 /* 3357 * TODO: space_limit's in delegations 3358 */ 3359 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE); 3360 *p++ = cpu_to_be32(~(u32)0); 3361 *p++ = cpu_to_be32(~(u32)0); 3362 3363 /* 3364 * TODO: ACE's in delegations 3365 */ 3366 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3367 *p++ = cpu_to_be32(0); 3368 *p++ = cpu_to_be32(0); 3369 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3370 break; 3371 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */ 3372 switch (open->op_why_no_deleg) { 3373 case WND4_CONTENTION: 3374 case WND4_RESOURCE: 3375 p = xdr_reserve_space(xdr, 8); 3376 if (!p) 3377 return nfserr_resource; 3378 *p++ = cpu_to_be32(open->op_why_no_deleg); 3379 /* deleg signaling not supported yet: */ 3380 *p++ = cpu_to_be32(0); 3381 break; 3382 default: 3383 p = xdr_reserve_space(xdr, 4); 3384 if (!p) 3385 return nfserr_resource; 3386 *p++ = cpu_to_be32(open->op_why_no_deleg); 3387 } 3388 break; 3389 default: 3390 BUG(); 3391 } 3392 /* XXX save filehandle here */ 3393 return 0; 3394 } 3395 3396 static __be32 3397 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc) 3398 { 3399 struct xdr_stream *xdr = &resp->xdr; 3400 3401 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid); 3402 } 3403 3404 static __be32 3405 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od) 3406 { 3407 struct xdr_stream *xdr = &resp->xdr; 3408 3409 return nfsd4_encode_stateid(xdr, &od->od_stateid); 3410 } 3411 3412 static __be32 nfsd4_encode_splice_read( 3413 struct nfsd4_compoundres *resp, 3414 struct nfsd4_read *read, 3415 struct file *file, unsigned long maxcount) 3416 { 3417 struct xdr_stream *xdr = &resp->xdr; 3418 struct xdr_buf *buf = xdr->buf; 3419 u32 eof; 3420 long len; 3421 int space_left; 3422 __be32 nfserr; 3423 __be32 *p = xdr->p - 2; 3424 3425 /* Make sure there will be room for padding if needed */ 3426 if (xdr->end - xdr->p < 1) 3427 return nfserr_resource; 3428 3429 len = maxcount; 3430 nfserr = nfsd_splice_read(read->rd_rqstp, file, 3431 read->rd_offset, &maxcount); 3432 if (nfserr) { 3433 /* 3434 * nfsd_splice_actor may have already messed with the 3435 * page length; reset it so as not to confuse 3436 * xdr_truncate_encode: 3437 */ 3438 buf->page_len = 0; 3439 return nfserr; 3440 } 3441 3442 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset, 3443 d_inode(read->rd_fhp->fh_dentry)->i_size); 3444 3445 *(p++) = htonl(eof); 3446 *(p++) = htonl(maxcount); 3447 3448 buf->page_len = maxcount; 3449 buf->len += maxcount; 3450 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1) 3451 / PAGE_SIZE; 3452 3453 /* Use rest of head for padding and remaining ops: */ 3454 buf->tail[0].iov_base = xdr->p; 3455 buf->tail[0].iov_len = 0; 3456 xdr->iov = buf->tail; 3457 if (maxcount&3) { 3458 int pad = 4 - (maxcount&3); 3459 3460 *(xdr->p++) = 0; 3461 3462 buf->tail[0].iov_base += maxcount&3; 3463 buf->tail[0].iov_len = pad; 3464 buf->len += pad; 3465 } 3466 3467 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p, 3468 buf->buflen - buf->len); 3469 buf->buflen = buf->len + space_left; 3470 xdr->end = (__be32 *)((void *)xdr->end + space_left); 3471 3472 return 0; 3473 } 3474 3475 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, 3476 struct nfsd4_read *read, 3477 struct file *file, unsigned long maxcount) 3478 { 3479 struct xdr_stream *xdr = &resp->xdr; 3480 u32 eof; 3481 int v; 3482 int starting_len = xdr->buf->len - 8; 3483 long len; 3484 int thislen; 3485 __be32 nfserr; 3486 __be32 tmp; 3487 __be32 *p; 3488 u32 zzz = 0; 3489 int pad; 3490 3491 len = maxcount; 3492 v = 0; 3493 3494 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p)); 3495 p = xdr_reserve_space(xdr, (thislen+3)&~3); 3496 WARN_ON_ONCE(!p); 3497 resp->rqstp->rq_vec[v].iov_base = p; 3498 resp->rqstp->rq_vec[v].iov_len = thislen; 3499 v++; 3500 len -= thislen; 3501 3502 while (len) { 3503 thislen = min_t(long, len, PAGE_SIZE); 3504 p = xdr_reserve_space(xdr, (thislen+3)&~3); 3505 WARN_ON_ONCE(!p); 3506 resp->rqstp->rq_vec[v].iov_base = p; 3507 resp->rqstp->rq_vec[v].iov_len = thislen; 3508 v++; 3509 len -= thislen; 3510 } 3511 read->rd_vlen = v; 3512 3513 len = maxcount; 3514 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec, 3515 read->rd_vlen, &maxcount); 3516 if (nfserr) 3517 return nfserr; 3518 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3)); 3519 3520 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset, 3521 d_inode(read->rd_fhp->fh_dentry)->i_size); 3522 3523 tmp = htonl(eof); 3524 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4); 3525 tmp = htonl(maxcount); 3526 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4); 3527 3528 pad = (maxcount&3) ? 4 - (maxcount&3) : 0; 3529 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount, 3530 &zzz, pad); 3531 return 0; 3532 3533 } 3534 3535 static __be32 3536 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 3537 struct nfsd4_read *read) 3538 { 3539 unsigned long maxcount; 3540 struct xdr_stream *xdr = &resp->xdr; 3541 struct file *file = read->rd_filp; 3542 int starting_len = xdr->buf->len; 3543 struct raparms *ra = NULL; 3544 __be32 *p; 3545 3546 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ 3547 if (!p) { 3548 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)); 3549 return nfserr_resource; 3550 } 3551 if (resp->xdr.buf->page_len && 3552 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) { 3553 WARN_ON_ONCE(1); 3554 return nfserr_resource; 3555 } 3556 xdr_commit_encode(xdr); 3557 3558 maxcount = svc_max_payload(resp->rqstp); 3559 maxcount = min_t(unsigned long, maxcount, 3560 (xdr->buf->buflen - xdr->buf->len)); 3561 maxcount = min_t(unsigned long, maxcount, read->rd_length); 3562 3563 if (read->rd_tmp_file) 3564 ra = nfsd_init_raparms(file); 3565 3566 if (file->f_op->splice_read && 3567 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) 3568 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount); 3569 else 3570 nfserr = nfsd4_encode_readv(resp, read, file, maxcount); 3571 3572 if (ra) 3573 nfsd_put_raparams(file, ra); 3574 3575 if (nfserr) 3576 xdr_truncate_encode(xdr, starting_len); 3577 3578 return nfserr; 3579 } 3580 3581 static __be32 3582 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink) 3583 { 3584 int maxcount; 3585 __be32 wire_count; 3586 int zero = 0; 3587 struct xdr_stream *xdr = &resp->xdr; 3588 int length_offset = xdr->buf->len; 3589 __be32 *p; 3590 3591 p = xdr_reserve_space(xdr, 4); 3592 if (!p) 3593 return nfserr_resource; 3594 maxcount = PAGE_SIZE; 3595 3596 p = xdr_reserve_space(xdr, maxcount); 3597 if (!p) 3598 return nfserr_resource; 3599 /* 3600 * XXX: By default, vfs_readlink() will truncate symlinks if they 3601 * would overflow the buffer. Is this kosher in NFSv4? If not, one 3602 * easy fix is: if vfs_readlink() precisely fills the buffer, assume 3603 * that truncation occurred, and return NFS4ERR_RESOURCE. 3604 */ 3605 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, 3606 (char *)p, &maxcount); 3607 if (nfserr == nfserr_isdir) 3608 nfserr = nfserr_inval; 3609 if (nfserr) { 3610 xdr_truncate_encode(xdr, length_offset); 3611 return nfserr; 3612 } 3613 3614 wire_count = htonl(maxcount); 3615 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4); 3616 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4)); 3617 if (maxcount & 3) 3618 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, 3619 &zero, 4 - (maxcount&3)); 3620 return 0; 3621 } 3622 3623 static __be32 3624 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir) 3625 { 3626 int maxcount; 3627 int bytes_left; 3628 loff_t offset; 3629 __be64 wire_offset; 3630 struct xdr_stream *xdr = &resp->xdr; 3631 int starting_len = xdr->buf->len; 3632 __be32 *p; 3633 3634 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3635 if (!p) 3636 return nfserr_resource; 3637 3638 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ 3639 *p++ = cpu_to_be32(0); 3640 *p++ = cpu_to_be32(0); 3641 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p) 3642 - (char *)resp->xdr.buf->head[0].iov_base; 3643 3644 /* 3645 * Number of bytes left for directory entries allowing for the 3646 * final 8 bytes of the readdir and a following failed op: 3647 */ 3648 bytes_left = xdr->buf->buflen - xdr->buf->len 3649 - COMPOUND_ERR_SLACK_SPACE - 8; 3650 if (bytes_left < 0) { 3651 nfserr = nfserr_resource; 3652 goto err_no_verf; 3653 } 3654 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX); 3655 /* 3656 * Note the rfc defines rd_maxcount as the size of the 3657 * READDIR4resok structure, which includes the verifier above 3658 * and the 8 bytes encoded at the end of this function: 3659 */ 3660 if (maxcount < 16) { 3661 nfserr = nfserr_toosmall; 3662 goto err_no_verf; 3663 } 3664 maxcount = min_t(int, maxcount-16, bytes_left); 3665 3666 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */ 3667 if (!readdir->rd_dircount) 3668 readdir->rd_dircount = INT_MAX; 3669 3670 readdir->xdr = xdr; 3671 readdir->rd_maxcount = maxcount; 3672 readdir->common.err = 0; 3673 readdir->cookie_offset = 0; 3674 3675 offset = readdir->rd_cookie; 3676 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, 3677 &offset, 3678 &readdir->common, nfsd4_encode_dirent); 3679 if (nfserr == nfs_ok && 3680 readdir->common.err == nfserr_toosmall && 3681 xdr->buf->len == starting_len + 8) { 3682 /* nothing encoded; which limit did we hit?: */ 3683 if (maxcount - 16 < bytes_left) 3684 /* It was the fault of rd_maxcount: */ 3685 nfserr = nfserr_toosmall; 3686 else 3687 /* We ran out of buffer space: */ 3688 nfserr = nfserr_resource; 3689 } 3690 if (nfserr) 3691 goto err_no_verf; 3692 3693 if (readdir->cookie_offset) { 3694 wire_offset = cpu_to_be64(offset); 3695 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, 3696 &wire_offset, 8); 3697 } 3698 3699 p = xdr_reserve_space(xdr, 8); 3700 if (!p) { 3701 WARN_ON_ONCE(1); 3702 goto err_no_verf; 3703 } 3704 *p++ = 0; /* no more entries */ 3705 *p++ = htonl(readdir->common.err == nfserr_eof); 3706 3707 return 0; 3708 err_no_verf: 3709 xdr_truncate_encode(xdr, starting_len); 3710 return nfserr; 3711 } 3712 3713 static __be32 3714 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove) 3715 { 3716 struct xdr_stream *xdr = &resp->xdr; 3717 __be32 *p; 3718 3719 p = xdr_reserve_space(xdr, 20); 3720 if (!p) 3721 return nfserr_resource; 3722 p = encode_cinfo(p, &remove->rm_cinfo); 3723 return 0; 3724 } 3725 3726 static __be32 3727 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename) 3728 { 3729 struct xdr_stream *xdr = &resp->xdr; 3730 __be32 *p; 3731 3732 p = xdr_reserve_space(xdr, 40); 3733 if (!p) 3734 return nfserr_resource; 3735 p = encode_cinfo(p, &rename->rn_sinfo); 3736 p = encode_cinfo(p, &rename->rn_tinfo); 3737 return 0; 3738 } 3739 3740 static __be32 3741 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp) 3742 { 3743 u32 i, nflavs, supported; 3744 struct exp_flavor_info *flavs; 3745 struct exp_flavor_info def_flavs[2]; 3746 __be32 *p, *flavorsp; 3747 static bool report = true; 3748 3749 if (exp->ex_nflavors) { 3750 flavs = exp->ex_flavors; 3751 nflavs = exp->ex_nflavors; 3752 } else { /* Handling of some defaults in absence of real secinfo: */ 3753 flavs = def_flavs; 3754 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { 3755 nflavs = 2; 3756 flavs[0].pseudoflavor = RPC_AUTH_UNIX; 3757 flavs[1].pseudoflavor = RPC_AUTH_NULL; 3758 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { 3759 nflavs = 1; 3760 flavs[0].pseudoflavor 3761 = svcauth_gss_flavor(exp->ex_client); 3762 } else { 3763 nflavs = 1; 3764 flavs[0].pseudoflavor 3765 = exp->ex_client->flavour->flavour; 3766 } 3767 } 3768 3769 supported = 0; 3770 p = xdr_reserve_space(xdr, 4); 3771 if (!p) 3772 return nfserr_resource; 3773 flavorsp = p++; /* to be backfilled later */ 3774 3775 for (i = 0; i < nflavs; i++) { 3776 rpc_authflavor_t pf = flavs[i].pseudoflavor; 3777 struct rpcsec_gss_info info; 3778 3779 if (rpcauth_get_gssinfo(pf, &info) == 0) { 3780 supported++; 3781 p = xdr_reserve_space(xdr, 4 + 4 + 3782 XDR_LEN(info.oid.len) + 4 + 4); 3783 if (!p) 3784 return nfserr_resource; 3785 *p++ = cpu_to_be32(RPC_AUTH_GSS); 3786 p = xdr_encode_opaque(p, info.oid.data, info.oid.len); 3787 *p++ = cpu_to_be32(info.qop); 3788 *p++ = cpu_to_be32(info.service); 3789 } else if (pf < RPC_AUTH_MAXFLAVOR) { 3790 supported++; 3791 p = xdr_reserve_space(xdr, 4); 3792 if (!p) 3793 return nfserr_resource; 3794 *p++ = cpu_to_be32(pf); 3795 } else { 3796 if (report) 3797 pr_warn("NFS: SECINFO: security flavor %u " 3798 "is not supported\n", pf); 3799 } 3800 } 3801 3802 if (nflavs != supported) 3803 report = false; 3804 *flavorsp = htonl(supported); 3805 return 0; 3806 } 3807 3808 static __be32 3809 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 3810 struct nfsd4_secinfo *secinfo) 3811 { 3812 struct xdr_stream *xdr = &resp->xdr; 3813 3814 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp); 3815 } 3816 3817 static __be32 3818 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, 3819 struct nfsd4_secinfo_no_name *secinfo) 3820 { 3821 struct xdr_stream *xdr = &resp->xdr; 3822 3823 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp); 3824 } 3825 3826 /* 3827 * The SETATTR encode routine is special -- it always encodes a bitmap, 3828 * regardless of the error status. 3829 */ 3830 static __be32 3831 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr) 3832 { 3833 struct xdr_stream *xdr = &resp->xdr; 3834 __be32 *p; 3835 3836 p = xdr_reserve_space(xdr, 16); 3837 if (!p) 3838 return nfserr_resource; 3839 if (nfserr) { 3840 *p++ = cpu_to_be32(3); 3841 *p++ = cpu_to_be32(0); 3842 *p++ = cpu_to_be32(0); 3843 *p++ = cpu_to_be32(0); 3844 } 3845 else { 3846 *p++ = cpu_to_be32(3); 3847 *p++ = cpu_to_be32(setattr->sa_bmval[0]); 3848 *p++ = cpu_to_be32(setattr->sa_bmval[1]); 3849 *p++ = cpu_to_be32(setattr->sa_bmval[2]); 3850 } 3851 return nfserr; 3852 } 3853 3854 static __be32 3855 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd) 3856 { 3857 struct xdr_stream *xdr = &resp->xdr; 3858 __be32 *p; 3859 3860 if (!nfserr) { 3861 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE); 3862 if (!p) 3863 return nfserr_resource; 3864 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8); 3865 p = xdr_encode_opaque_fixed(p, &scd->se_confirm, 3866 NFS4_VERIFIER_SIZE); 3867 } 3868 else if (nfserr == nfserr_clid_inuse) { 3869 p = xdr_reserve_space(xdr, 8); 3870 if (!p) 3871 return nfserr_resource; 3872 *p++ = cpu_to_be32(0); 3873 *p++ = cpu_to_be32(0); 3874 } 3875 return nfserr; 3876 } 3877 3878 static __be32 3879 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write) 3880 { 3881 struct xdr_stream *xdr = &resp->xdr; 3882 __be32 *p; 3883 3884 p = xdr_reserve_space(xdr, 16); 3885 if (!p) 3886 return nfserr_resource; 3887 *p++ = cpu_to_be32(write->wr_bytes_written); 3888 *p++ = cpu_to_be32(write->wr_how_written); 3889 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 3890 NFS4_VERIFIER_SIZE); 3891 return 0; 3892 } 3893 3894 static __be32 3895 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, 3896 struct nfsd4_exchange_id *exid) 3897 { 3898 struct xdr_stream *xdr = &resp->xdr; 3899 __be32 *p; 3900 char *major_id; 3901 char *server_scope; 3902 int major_id_sz; 3903 int server_scope_sz; 3904 uint64_t minor_id = 0; 3905 3906 major_id = utsname()->nodename; 3907 major_id_sz = strlen(major_id); 3908 server_scope = utsname()->nodename; 3909 server_scope_sz = strlen(server_scope); 3910 3911 p = xdr_reserve_space(xdr, 3912 8 /* eir_clientid */ + 3913 4 /* eir_sequenceid */ + 3914 4 /* eir_flags */ + 3915 4 /* spr_how */); 3916 if (!p) 3917 return nfserr_resource; 3918 3919 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8); 3920 *p++ = cpu_to_be32(exid->seqid); 3921 *p++ = cpu_to_be32(exid->flags); 3922 3923 *p++ = cpu_to_be32(exid->spa_how); 3924 3925 switch (exid->spa_how) { 3926 case SP4_NONE: 3927 break; 3928 case SP4_MACH_CRED: 3929 /* spo_must_enforce bitmap: */ 3930 nfserr = nfsd4_encode_bitmap(xdr, 3931 exid->spo_must_enforce[0], 3932 exid->spo_must_enforce[1], 3933 exid->spo_must_enforce[2]); 3934 if (nfserr) 3935 return nfserr; 3936 /* spo_must_allow bitmap: */ 3937 nfserr = nfsd4_encode_bitmap(xdr, 3938 exid->spo_must_allow[0], 3939 exid->spo_must_allow[1], 3940 exid->spo_must_allow[2]); 3941 if (nfserr) 3942 return nfserr; 3943 break; 3944 default: 3945 WARN_ON_ONCE(1); 3946 } 3947 3948 p = xdr_reserve_space(xdr, 3949 8 /* so_minor_id */ + 3950 4 /* so_major_id.len */ + 3951 (XDR_QUADLEN(major_id_sz) * 4) + 3952 4 /* eir_server_scope.len */ + 3953 (XDR_QUADLEN(server_scope_sz) * 4) + 3954 4 /* eir_server_impl_id.count (0) */); 3955 if (!p) 3956 return nfserr_resource; 3957 3958 /* The server_owner struct */ 3959 p = xdr_encode_hyper(p, minor_id); /* Minor id */ 3960 /* major id */ 3961 p = xdr_encode_opaque(p, major_id, major_id_sz); 3962 3963 /* Server scope */ 3964 p = xdr_encode_opaque(p, server_scope, server_scope_sz); 3965 3966 /* Implementation id */ 3967 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */ 3968 return 0; 3969 } 3970 3971 static __be32 3972 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, 3973 struct nfsd4_create_session *sess) 3974 { 3975 struct xdr_stream *xdr = &resp->xdr; 3976 __be32 *p; 3977 3978 p = xdr_reserve_space(xdr, 24); 3979 if (!p) 3980 return nfserr_resource; 3981 p = xdr_encode_opaque_fixed(p, sess->sessionid.data, 3982 NFS4_MAX_SESSIONID_LEN); 3983 *p++ = cpu_to_be32(sess->seqid); 3984 *p++ = cpu_to_be32(sess->flags); 3985 3986 p = xdr_reserve_space(xdr, 28); 3987 if (!p) 3988 return nfserr_resource; 3989 *p++ = cpu_to_be32(0); /* headerpadsz */ 3990 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz); 3991 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz); 3992 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached); 3993 *p++ = cpu_to_be32(sess->fore_channel.maxops); 3994 *p++ = cpu_to_be32(sess->fore_channel.maxreqs); 3995 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs); 3996 3997 if (sess->fore_channel.nr_rdma_attrs) { 3998 p = xdr_reserve_space(xdr, 4); 3999 if (!p) 4000 return nfserr_resource; 4001 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs); 4002 } 4003 4004 p = xdr_reserve_space(xdr, 28); 4005 if (!p) 4006 return nfserr_resource; 4007 *p++ = cpu_to_be32(0); /* headerpadsz */ 4008 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz); 4009 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz); 4010 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached); 4011 *p++ = cpu_to_be32(sess->back_channel.maxops); 4012 *p++ = cpu_to_be32(sess->back_channel.maxreqs); 4013 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs); 4014 4015 if (sess->back_channel.nr_rdma_attrs) { 4016 p = xdr_reserve_space(xdr, 4); 4017 if (!p) 4018 return nfserr_resource; 4019 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs); 4020 } 4021 return 0; 4022 } 4023 4024 static __be32 4025 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, 4026 struct nfsd4_sequence *seq) 4027 { 4028 struct xdr_stream *xdr = &resp->xdr; 4029 __be32 *p; 4030 4031 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20); 4032 if (!p) 4033 return nfserr_resource; 4034 p = xdr_encode_opaque_fixed(p, seq->sessionid.data, 4035 NFS4_MAX_SESSIONID_LEN); 4036 *p++ = cpu_to_be32(seq->seqid); 4037 *p++ = cpu_to_be32(seq->slotid); 4038 /* Note slotid's are numbered from zero: */ 4039 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */ 4040 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */ 4041 *p++ = cpu_to_be32(seq->status_flags); 4042 4043 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */ 4044 return 0; 4045 } 4046 4047 static __be32 4048 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, 4049 struct nfsd4_test_stateid *test_stateid) 4050 { 4051 struct xdr_stream *xdr = &resp->xdr; 4052 struct nfsd4_test_stateid_id *stateid, *next; 4053 __be32 *p; 4054 4055 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids)); 4056 if (!p) 4057 return nfserr_resource; 4058 *p++ = htonl(test_stateid->ts_num_ids); 4059 4060 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) { 4061 *p++ = stateid->ts_id_status; 4062 } 4063 4064 return 0; 4065 } 4066 4067 #ifdef CONFIG_NFSD_PNFS 4068 static __be32 4069 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 4070 struct nfsd4_getdeviceinfo *gdev) 4071 { 4072 struct xdr_stream *xdr = &resp->xdr; 4073 const struct nfsd4_layout_ops *ops; 4074 u32 starting_len = xdr->buf->len, needed_len; 4075 __be32 *p; 4076 4077 p = xdr_reserve_space(xdr, 4); 4078 if (!p) 4079 return nfserr_resource; 4080 4081 *p++ = cpu_to_be32(gdev->gd_layout_type); 4082 4083 /* If maxcount is 0 then just update notifications */ 4084 if (gdev->gd_maxcount != 0) { 4085 ops = nfsd4_layout_ops[gdev->gd_layout_type]; 4086 nfserr = ops->encode_getdeviceinfo(xdr, gdev); 4087 if (nfserr) { 4088 /* 4089 * We don't bother to burden the layout drivers with 4090 * enforcing gd_maxcount, just tell the client to 4091 * come back with a bigger buffer if it's not enough. 4092 */ 4093 if (xdr->buf->len + 4 > gdev->gd_maxcount) 4094 goto toosmall; 4095 return nfserr; 4096 } 4097 } 4098 4099 if (gdev->gd_notify_types) { 4100 p = xdr_reserve_space(xdr, 4 + 4); 4101 if (!p) 4102 return nfserr_resource; 4103 *p++ = cpu_to_be32(1); /* bitmap length */ 4104 *p++ = cpu_to_be32(gdev->gd_notify_types); 4105 } else { 4106 p = xdr_reserve_space(xdr, 4); 4107 if (!p) 4108 return nfserr_resource; 4109 *p++ = 0; 4110 } 4111 4112 return 0; 4113 toosmall: 4114 dprintk("%s: maxcount too small\n", __func__); 4115 needed_len = xdr->buf->len + 4 /* notifications */; 4116 xdr_truncate_encode(xdr, starting_len); 4117 p = xdr_reserve_space(xdr, 4); 4118 if (!p) 4119 return nfserr_resource; 4120 *p++ = cpu_to_be32(needed_len); 4121 return nfserr_toosmall; 4122 } 4123 4124 static __be32 4125 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr, 4126 struct nfsd4_layoutget *lgp) 4127 { 4128 struct xdr_stream *xdr = &resp->xdr; 4129 const struct nfsd4_layout_ops *ops; 4130 __be32 *p; 4131 4132 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t)); 4133 if (!p) 4134 return nfserr_resource; 4135 4136 *p++ = cpu_to_be32(1); /* we always set return-on-close */ 4137 *p++ = cpu_to_be32(lgp->lg_sid.si_generation); 4138 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque, 4139 sizeof(stateid_opaque_t)); 4140 4141 *p++ = cpu_to_be32(1); /* we always return a single layout */ 4142 p = xdr_encode_hyper(p, lgp->lg_seg.offset); 4143 p = xdr_encode_hyper(p, lgp->lg_seg.length); 4144 *p++ = cpu_to_be32(lgp->lg_seg.iomode); 4145 *p++ = cpu_to_be32(lgp->lg_layout_type); 4146 4147 ops = nfsd4_layout_ops[lgp->lg_layout_type]; 4148 return ops->encode_layoutget(xdr, lgp); 4149 } 4150 4151 static __be32 4152 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr, 4153 struct nfsd4_layoutcommit *lcp) 4154 { 4155 struct xdr_stream *xdr = &resp->xdr; 4156 __be32 *p; 4157 4158 p = xdr_reserve_space(xdr, 4); 4159 if (!p) 4160 return nfserr_resource; 4161 *p++ = cpu_to_be32(lcp->lc_size_chg); 4162 if (lcp->lc_size_chg) { 4163 p = xdr_reserve_space(xdr, 8); 4164 if (!p) 4165 return nfserr_resource; 4166 p = xdr_encode_hyper(p, lcp->lc_newsize); 4167 } 4168 4169 return 0; 4170 } 4171 4172 static __be32 4173 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr, 4174 struct nfsd4_layoutreturn *lrp) 4175 { 4176 struct xdr_stream *xdr = &resp->xdr; 4177 __be32 *p; 4178 4179 p = xdr_reserve_space(xdr, 4); 4180 if (!p) 4181 return nfserr_resource; 4182 *p++ = cpu_to_be32(lrp->lrs_present); 4183 if (lrp->lrs_present) 4184 return nfsd4_encode_stateid(xdr, &lrp->lr_sid); 4185 return 0; 4186 } 4187 #endif /* CONFIG_NFSD_PNFS */ 4188 4189 static __be32 4190 nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write) 4191 { 4192 __be32 *p; 4193 4194 p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE); 4195 if (!p) 4196 return nfserr_resource; 4197 4198 *p++ = cpu_to_be32(0); 4199 p = xdr_encode_hyper(p, write->wr_bytes_written); 4200 *p++ = cpu_to_be32(write->wr_stable_how); 4201 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 4202 NFS4_VERIFIER_SIZE); 4203 return nfs_ok; 4204 } 4205 4206 static __be32 4207 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr, 4208 struct nfsd4_copy *copy) 4209 { 4210 __be32 *p; 4211 4212 nfserr = nfsd42_encode_write_res(resp, ©->cp_res); 4213 if (nfserr) 4214 return nfserr; 4215 4216 p = xdr_reserve_space(&resp->xdr, 4 + 4); 4217 *p++ = cpu_to_be32(copy->cp_consecutive); 4218 *p++ = cpu_to_be32(copy->cp_synchronous); 4219 return 0; 4220 } 4221 4222 static __be32 4223 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, 4224 struct nfsd4_seek *seek) 4225 { 4226 __be32 *p; 4227 4228 p = xdr_reserve_space(&resp->xdr, 4 + 8); 4229 *p++ = cpu_to_be32(seek->seek_eof); 4230 p = xdr_encode_hyper(p, seek->seek_pos); 4231 4232 return 0; 4233 } 4234 4235 static __be32 4236 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p) 4237 { 4238 return nfserr; 4239 } 4240 4241 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *); 4242 4243 /* 4244 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1 4245 * since we don't need to filter out obsolete ops as this is 4246 * done in the decoding phase. 4247 */ 4248 static const nfsd4_enc nfsd4_enc_ops[] = { 4249 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access, 4250 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close, 4251 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit, 4252 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create, 4253 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop, 4254 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop, 4255 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr, 4256 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh, 4257 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link, 4258 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock, 4259 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt, 4260 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku, 4261 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop, 4262 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop, 4263 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop, 4264 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open, 4265 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop, 4266 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm, 4267 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade, 4268 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop, 4269 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop, 4270 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop, 4271 [OP_READ] = (nfsd4_enc)nfsd4_encode_read, 4272 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir, 4273 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink, 4274 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove, 4275 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename, 4276 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop, 4277 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop, 4278 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop, 4279 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo, 4280 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr, 4281 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid, 4282 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop, 4283 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop, 4284 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write, 4285 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop, 4286 4287 /* NFSv4.1 operations */ 4288 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop, 4289 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session, 4290 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id, 4291 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session, 4292 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop, 4293 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop, 4294 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 4295 #ifdef CONFIG_NFSD_PNFS 4296 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo, 4297 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 4298 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit, 4299 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget, 4300 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn, 4301 #else 4302 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop, 4303 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 4304 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop, 4305 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop, 4306 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop, 4307 #endif 4308 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name, 4309 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence, 4310 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop, 4311 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid, 4312 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 4313 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop, 4314 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop, 4315 4316 /* NFSv4.2 operations */ 4317 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 4318 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy, 4319 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop, 4320 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 4321 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop, 4322 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop, 4323 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop, 4324 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop, 4325 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop, 4326 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop, 4327 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek, 4328 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop, 4329 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop, 4330 }; 4331 4332 /* 4333 * Calculate whether we still have space to encode repsize bytes. 4334 * There are two considerations: 4335 * - For NFS versions >=4.1, the size of the reply must stay within 4336 * session limits 4337 * - For all NFS versions, we must stay within limited preallocated 4338 * buffer space. 4339 * 4340 * This is called before the operation is processed, so can only provide 4341 * an upper estimate. For some nonidempotent operations (such as 4342 * getattr), it's not necessarily a problem if that estimate is wrong, 4343 * as we can fail it after processing without significant side effects. 4344 */ 4345 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize) 4346 { 4347 struct xdr_buf *buf = &resp->rqstp->rq_res; 4348 struct nfsd4_slot *slot = resp->cstate.slot; 4349 4350 if (buf->len + respsize <= buf->buflen) 4351 return nfs_ok; 4352 if (!nfsd4_has_session(&resp->cstate)) 4353 return nfserr_resource; 4354 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) { 4355 WARN_ON_ONCE(1); 4356 return nfserr_rep_too_big_to_cache; 4357 } 4358 return nfserr_rep_too_big; 4359 } 4360 4361 void 4362 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 4363 { 4364 struct xdr_stream *xdr = &resp->xdr; 4365 struct nfs4_stateowner *so = resp->cstate.replay_owner; 4366 struct svc_rqst *rqstp = resp->rqstp; 4367 const struct nfsd4_operation *opdesc = op->opdesc; 4368 int post_err_offset; 4369 nfsd4_enc encoder; 4370 __be32 *p; 4371 4372 p = xdr_reserve_space(xdr, 8); 4373 if (!p) { 4374 WARN_ON_ONCE(1); 4375 return; 4376 } 4377 *p++ = cpu_to_be32(op->opnum); 4378 post_err_offset = xdr->buf->len; 4379 4380 if (op->opnum == OP_ILLEGAL) 4381 goto status; 4382 if (op->status && opdesc && 4383 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE)) 4384 goto status; 4385 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || 4386 !nfsd4_enc_ops[op->opnum]); 4387 encoder = nfsd4_enc_ops[op->opnum]; 4388 op->status = encoder(resp, op->status, &op->u); 4389 if (opdesc && opdesc->op_release) 4390 opdesc->op_release(&op->u); 4391 xdr_commit_encode(xdr); 4392 4393 /* nfsd4_check_resp_size guarantees enough room for error status */ 4394 if (!op->status) { 4395 int space_needed = 0; 4396 if (!nfsd4_last_compound_op(rqstp)) 4397 space_needed = COMPOUND_ERR_SLACK_SPACE; 4398 op->status = nfsd4_check_resp_size(resp, space_needed); 4399 } 4400 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) { 4401 struct nfsd4_slot *slot = resp->cstate.slot; 4402 4403 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) 4404 op->status = nfserr_rep_too_big_to_cache; 4405 else 4406 op->status = nfserr_rep_too_big; 4407 } 4408 if (op->status == nfserr_resource || 4409 op->status == nfserr_rep_too_big || 4410 op->status == nfserr_rep_too_big_to_cache) { 4411 /* 4412 * The operation may have already been encoded or 4413 * partially encoded. No op returns anything additional 4414 * in the case of one of these three errors, so we can 4415 * just truncate back to after the status. But it's a 4416 * bug if we had to do this on a non-idempotent op: 4417 */ 4418 warn_on_nonidempotent_op(op); 4419 xdr_truncate_encode(xdr, post_err_offset); 4420 } 4421 if (so) { 4422 int len = xdr->buf->len - post_err_offset; 4423 4424 so->so_replay.rp_status = op->status; 4425 so->so_replay.rp_buflen = len; 4426 read_bytes_from_xdr_buf(xdr->buf, post_err_offset, 4427 so->so_replay.rp_buf, len); 4428 } 4429 status: 4430 /* Note that op->status is already in network byte order: */ 4431 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4); 4432 } 4433 4434 /* 4435 * Encode the reply stored in the stateowner reply cache 4436 * 4437 * XDR note: do not encode rp->rp_buflen: the buffer contains the 4438 * previously sent already encoded operation. 4439 */ 4440 void 4441 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op) 4442 { 4443 __be32 *p; 4444 struct nfs4_replay *rp = op->replay; 4445 4446 BUG_ON(!rp); 4447 4448 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen); 4449 if (!p) { 4450 WARN_ON_ONCE(1); 4451 return; 4452 } 4453 *p++ = cpu_to_be32(op->opnum); 4454 *p++ = rp->rp_status; /* already xdr'ed */ 4455 4456 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen); 4457 } 4458 4459 int 4460 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p) 4461 { 4462 return xdr_ressize_check(rqstp, p); 4463 } 4464 4465 void nfsd4_release_compoundargs(struct svc_rqst *rqstp) 4466 { 4467 struct nfsd4_compoundargs *args = rqstp->rq_argp; 4468 4469 if (args->ops != args->iops) { 4470 kfree(args->ops); 4471 args->ops = args->iops; 4472 } 4473 kfree(args->tmpp); 4474 args->tmpp = NULL; 4475 while (args->to_free) { 4476 struct svcxdr_tmpbuf *tb = args->to_free; 4477 args->to_free = tb->next; 4478 kfree(tb); 4479 } 4480 } 4481 4482 int 4483 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p) 4484 { 4485 struct nfsd4_compoundargs *args = rqstp->rq_argp; 4486 4487 if (rqstp->rq_arg.head[0].iov_len % 4) { 4488 /* client is nuts */ 4489 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)", 4490 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid)); 4491 return 0; 4492 } 4493 args->p = p; 4494 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len; 4495 args->pagelist = rqstp->rq_arg.pages; 4496 args->pagelen = rqstp->rq_arg.page_len; 4497 args->tail = false; 4498 args->tmpp = NULL; 4499 args->to_free = NULL; 4500 args->ops = args->iops; 4501 args->rqstp = rqstp; 4502 4503 return !nfsd4_decode_compound(args); 4504 } 4505 4506 int 4507 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p) 4508 { 4509 /* 4510 * All that remains is to write the tag and operation count... 4511 */ 4512 struct nfsd4_compoundres *resp = rqstp->rq_resp; 4513 struct xdr_buf *buf = resp->xdr.buf; 4514 4515 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len + 4516 buf->tail[0].iov_len); 4517 4518 rqstp->rq_next_page = resp->xdr.page_ptr + 1; 4519 4520 p = resp->tagp; 4521 *p++ = htonl(resp->taglen); 4522 memcpy(p, resp->tag, resp->taglen); 4523 p += XDR_QUADLEN(resp->taglen); 4524 *p++ = htonl(resp->opcnt); 4525 4526 nfsd4_sequence_done(resp); 4527 return 1; 4528 } 4529 4530 /* 4531 * Local variables: 4532 * c-basic-offset: 8 4533 * End: 4534 */ 4535