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/slab.h> 37 #include <linux/namei.h> 38 #include <linux/statfs.h> 39 #include <linux/utsname.h> 40 #include <linux/pagemap.h> 41 #include <linux/sunrpc/svcauth_gss.h> 42 43 #include "idmap.h" 44 #include "acl.h" 45 #include "xdr4.h" 46 #include "vfs.h" 47 #include "state.h" 48 #include "cache.h" 49 #include "netns.h" 50 51 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 52 #include <linux/security.h> 53 #endif 54 55 56 #define NFSDDBG_FACILITY NFSDDBG_XDR 57 58 /* 59 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing 60 * directory in order to indicate to the client that a filesystem boundary is present 61 * We use a fixed fsid for a referral 62 */ 63 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL 64 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL 65 66 static __be32 67 check_filename(char *str, int len) 68 { 69 int i; 70 71 if (len == 0) 72 return nfserr_inval; 73 if (isdotent(str, len)) 74 return nfserr_badname; 75 for (i = 0; i < len; i++) 76 if (str[i] == '/') 77 return nfserr_badname; 78 return 0; 79 } 80 81 #define DECODE_HEAD \ 82 __be32 *p; \ 83 __be32 status 84 #define DECODE_TAIL \ 85 status = 0; \ 86 out: \ 87 return status; \ 88 xdr_error: \ 89 dprintk("NFSD: xdr error (%s:%d)\n", \ 90 __FILE__, __LINE__); \ 91 status = nfserr_bad_xdr; \ 92 goto out 93 94 #define READMEM(x,nbytes) do { \ 95 x = (char *)p; \ 96 p += XDR_QUADLEN(nbytes); \ 97 } while (0) 98 #define SAVEMEM(x,nbytes) do { \ 99 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \ 100 savemem(argp, p, nbytes) : \ 101 (char *)p)) { \ 102 dprintk("NFSD: xdr error (%s:%d)\n", \ 103 __FILE__, __LINE__); \ 104 goto xdr_error; \ 105 } \ 106 p += XDR_QUADLEN(nbytes); \ 107 } while (0) 108 #define COPYMEM(x,nbytes) do { \ 109 memcpy((x), p, nbytes); \ 110 p += XDR_QUADLEN(nbytes); \ 111 } while (0) 112 113 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */ 114 #define READ_BUF(nbytes) do { \ 115 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \ 116 p = argp->p; \ 117 argp->p += XDR_QUADLEN(nbytes); \ 118 } else if (!(p = read_buf(argp, nbytes))) { \ 119 dprintk("NFSD: xdr error (%s:%d)\n", \ 120 __FILE__, __LINE__); \ 121 goto xdr_error; \ 122 } \ 123 } while (0) 124 125 static void next_decode_page(struct nfsd4_compoundargs *argp) 126 { 127 argp->p = page_address(argp->pagelist[0]); 128 argp->pagelist++; 129 if (argp->pagelen < PAGE_SIZE) { 130 argp->end = argp->p + (argp->pagelen>>2); 131 argp->pagelen = 0; 132 } else { 133 argp->end = argp->p + (PAGE_SIZE>>2); 134 argp->pagelen -= PAGE_SIZE; 135 } 136 } 137 138 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes) 139 { 140 /* We want more bytes than seem to be available. 141 * Maybe we need a new page, maybe we have just run out 142 */ 143 unsigned int avail = (char *)argp->end - (char *)argp->p; 144 __be32 *p; 145 if (avail + argp->pagelen < nbytes) 146 return NULL; 147 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */ 148 return NULL; 149 /* ok, we can do it with the current plus the next page */ 150 if (nbytes <= sizeof(argp->tmp)) 151 p = argp->tmp; 152 else { 153 kfree(argp->tmpp); 154 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL); 155 if (!p) 156 return NULL; 157 158 } 159 /* 160 * The following memcpy is safe because read_buf is always 161 * called with nbytes > avail, and the two cases above both 162 * guarantee p points to at least nbytes bytes. 163 */ 164 memcpy(p, argp->p, avail); 165 next_decode_page(argp); 166 memcpy(((char*)p)+avail, argp->p, (nbytes - avail)); 167 argp->p += XDR_QUADLEN(nbytes - avail); 168 return p; 169 } 170 171 static int zero_clientid(clientid_t *clid) 172 { 173 return (clid->cl_boot == 0) && (clid->cl_id == 0); 174 } 175 176 /** 177 * svcxdr_tmpalloc - allocate memory to be freed after compound processing 178 * @argp: NFSv4 compound argument structure 179 * @p: pointer to be freed (with kfree()) 180 * 181 * Marks @p to be freed when processing the compound operation 182 * described in @argp finishes. 183 */ 184 static void * 185 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len) 186 { 187 struct svcxdr_tmpbuf *tb; 188 189 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL); 190 if (!tb) 191 return NULL; 192 tb->next = argp->to_free; 193 argp->to_free = tb; 194 return tb->buf; 195 } 196 197 /* 198 * For xdr strings that need to be passed to other kernel api's 199 * as null-terminated strings. 200 * 201 * Note null-terminating in place usually isn't safe since the 202 * buffer might end on a page boundary. 203 */ 204 static char * 205 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len) 206 { 207 char *p = svcxdr_tmpalloc(argp, len + 1); 208 209 if (!p) 210 return NULL; 211 memcpy(p, buf, len); 212 p[len] = '\0'; 213 return p; 214 } 215 216 /** 217 * savemem - duplicate a chunk of memory for later processing 218 * @argp: NFSv4 compound argument structure to be freed with 219 * @p: pointer to be duplicated 220 * @nbytes: length to be duplicated 221 * 222 * Returns a pointer to a copy of @nbytes bytes of memory at @p 223 * that are preserved until processing of the NFSv4 compound 224 * operation described by @argp finishes. 225 */ 226 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes) 227 { 228 void *ret; 229 230 ret = svcxdr_tmpalloc(argp, nbytes); 231 if (!ret) 232 return NULL; 233 memcpy(ret, p, nbytes); 234 return ret; 235 } 236 237 static __be32 238 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval) 239 { 240 u32 bmlen; 241 DECODE_HEAD; 242 243 bmval[0] = 0; 244 bmval[1] = 0; 245 bmval[2] = 0; 246 247 READ_BUF(4); 248 bmlen = be32_to_cpup(p++); 249 if (bmlen > 1000) 250 goto xdr_error; 251 252 READ_BUF(bmlen << 2); 253 if (bmlen > 0) 254 bmval[0] = be32_to_cpup(p++); 255 if (bmlen > 1) 256 bmval[1] = be32_to_cpup(p++); 257 if (bmlen > 2) 258 bmval[2] = be32_to_cpup(p++); 259 260 DECODE_TAIL; 261 } 262 263 static __be32 264 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, 265 struct iattr *iattr, struct nfs4_acl **acl, 266 struct xdr_netobj *label) 267 { 268 int expected_len, len = 0; 269 u32 dummy32; 270 u64 sec; 271 char *buf; 272 273 DECODE_HEAD; 274 iattr->ia_valid = 0; 275 if ((status = nfsd4_decode_bitmap(argp, bmval))) 276 return status; 277 278 READ_BUF(4); 279 expected_len = be32_to_cpup(p++); 280 281 if (bmval[0] & FATTR4_WORD0_SIZE) { 282 READ_BUF(8); 283 len += 8; 284 p = xdr_decode_hyper(p, &iattr->ia_size); 285 iattr->ia_valid |= ATTR_SIZE; 286 } 287 if (bmval[0] & FATTR4_WORD0_ACL) { 288 u32 nace; 289 struct nfs4_ace *ace; 290 291 READ_BUF(4); len += 4; 292 nace = be32_to_cpup(p++); 293 294 if (nace > NFS4_ACL_MAX) 295 return nfserr_fbig; 296 297 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace)); 298 if (*acl == NULL) 299 return nfserr_jukebox; 300 301 (*acl)->naces = nace; 302 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) { 303 READ_BUF(16); len += 16; 304 ace->type = be32_to_cpup(p++); 305 ace->flag = be32_to_cpup(p++); 306 ace->access_mask = be32_to_cpup(p++); 307 dummy32 = be32_to_cpup(p++); 308 READ_BUF(dummy32); 309 len += XDR_QUADLEN(dummy32) << 2; 310 READMEM(buf, dummy32); 311 ace->whotype = nfs4_acl_get_whotype(buf, dummy32); 312 status = nfs_ok; 313 if (ace->whotype != NFS4_ACL_WHO_NAMED) 314 ; 315 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 316 status = nfsd_map_name_to_gid(argp->rqstp, 317 buf, dummy32, &ace->who_gid); 318 else 319 status = nfsd_map_name_to_uid(argp->rqstp, 320 buf, dummy32, &ace->who_uid); 321 if (status) 322 return status; 323 } 324 } else 325 *acl = NULL; 326 if (bmval[1] & FATTR4_WORD1_MODE) { 327 READ_BUF(4); 328 len += 4; 329 iattr->ia_mode = be32_to_cpup(p++); 330 iattr->ia_mode &= (S_IFMT | S_IALLUGO); 331 iattr->ia_valid |= ATTR_MODE; 332 } 333 if (bmval[1] & FATTR4_WORD1_OWNER) { 334 READ_BUF(4); 335 len += 4; 336 dummy32 = be32_to_cpup(p++); 337 READ_BUF(dummy32); 338 len += (XDR_QUADLEN(dummy32) << 2); 339 READMEM(buf, dummy32); 340 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid))) 341 return status; 342 iattr->ia_valid |= ATTR_UID; 343 } 344 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) { 345 READ_BUF(4); 346 len += 4; 347 dummy32 = be32_to_cpup(p++); 348 READ_BUF(dummy32); 349 len += (XDR_QUADLEN(dummy32) << 2); 350 READMEM(buf, dummy32); 351 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid))) 352 return status; 353 iattr->ia_valid |= ATTR_GID; 354 } 355 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) { 356 READ_BUF(4); 357 len += 4; 358 dummy32 = be32_to_cpup(p++); 359 switch (dummy32) { 360 case NFS4_SET_TO_CLIENT_TIME: 361 /* We require the high 32 bits of 'seconds' to be 0, and we ignore 362 all 32 bits of 'nseconds'. */ 363 READ_BUF(12); 364 len += 12; 365 p = xdr_decode_hyper(p, &sec); 366 iattr->ia_atime.tv_sec = (time_t)sec; 367 iattr->ia_atime.tv_nsec = be32_to_cpup(p++); 368 if (iattr->ia_atime.tv_nsec >= (u32)1000000000) 369 return nfserr_inval; 370 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET); 371 break; 372 case NFS4_SET_TO_SERVER_TIME: 373 iattr->ia_valid |= ATTR_ATIME; 374 break; 375 default: 376 goto xdr_error; 377 } 378 } 379 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) { 380 READ_BUF(4); 381 len += 4; 382 dummy32 = be32_to_cpup(p++); 383 switch (dummy32) { 384 case NFS4_SET_TO_CLIENT_TIME: 385 /* We require the high 32 bits of 'seconds' to be 0, and we ignore 386 all 32 bits of 'nseconds'. */ 387 READ_BUF(12); 388 len += 12; 389 p = xdr_decode_hyper(p, &sec); 390 iattr->ia_mtime.tv_sec = sec; 391 iattr->ia_mtime.tv_nsec = be32_to_cpup(p++); 392 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000) 393 return nfserr_inval; 394 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET); 395 break; 396 case NFS4_SET_TO_SERVER_TIME: 397 iattr->ia_valid |= ATTR_MTIME; 398 break; 399 default: 400 goto xdr_error; 401 } 402 } 403 404 label->len = 0; 405 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 406 if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) { 407 READ_BUF(4); 408 len += 4; 409 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */ 410 READ_BUF(4); 411 len += 4; 412 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */ 413 READ_BUF(4); 414 len += 4; 415 dummy32 = be32_to_cpup(p++); 416 READ_BUF(dummy32); 417 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN) 418 return nfserr_badlabel; 419 len += (XDR_QUADLEN(dummy32) << 2); 420 READMEM(buf, dummy32); 421 label->len = dummy32; 422 label->data = svcxdr_dupstr(argp, buf, dummy32); 423 if (!label->data) 424 return nfserr_jukebox; 425 } 426 #endif 427 428 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0 429 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1 430 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) 431 READ_BUF(expected_len - len); 432 else if (len != expected_len) 433 goto xdr_error; 434 435 DECODE_TAIL; 436 } 437 438 static __be32 439 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid) 440 { 441 DECODE_HEAD; 442 443 READ_BUF(sizeof(stateid_t)); 444 sid->si_generation = be32_to_cpup(p++); 445 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t)); 446 447 DECODE_TAIL; 448 } 449 450 static __be32 451 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access) 452 { 453 DECODE_HEAD; 454 455 READ_BUF(4); 456 access->ac_req_access = be32_to_cpup(p++); 457 458 DECODE_TAIL; 459 } 460 461 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs) 462 { 463 DECODE_HEAD; 464 u32 dummy, uid, gid; 465 char *machine_name; 466 int i; 467 int nr_secflavs; 468 469 /* callback_sec_params4 */ 470 READ_BUF(4); 471 nr_secflavs = be32_to_cpup(p++); 472 if (nr_secflavs) 473 cbs->flavor = (u32)(-1); 474 else 475 /* Is this legal? Be generous, take it to mean AUTH_NONE: */ 476 cbs->flavor = 0; 477 for (i = 0; i < nr_secflavs; ++i) { 478 READ_BUF(4); 479 dummy = be32_to_cpup(p++); 480 switch (dummy) { 481 case RPC_AUTH_NULL: 482 /* Nothing to read */ 483 if (cbs->flavor == (u32)(-1)) 484 cbs->flavor = RPC_AUTH_NULL; 485 break; 486 case RPC_AUTH_UNIX: 487 READ_BUF(8); 488 /* stamp */ 489 dummy = be32_to_cpup(p++); 490 491 /* machine name */ 492 dummy = be32_to_cpup(p++); 493 READ_BUF(dummy); 494 SAVEMEM(machine_name, dummy); 495 496 /* uid, gid */ 497 READ_BUF(8); 498 uid = be32_to_cpup(p++); 499 gid = be32_to_cpup(p++); 500 501 /* more gids */ 502 READ_BUF(4); 503 dummy = be32_to_cpup(p++); 504 READ_BUF(dummy * 4); 505 if (cbs->flavor == (u32)(-1)) { 506 kuid_t kuid = make_kuid(&init_user_ns, uid); 507 kgid_t kgid = make_kgid(&init_user_ns, gid); 508 if (uid_valid(kuid) && gid_valid(kgid)) { 509 cbs->uid = kuid; 510 cbs->gid = kgid; 511 cbs->flavor = RPC_AUTH_UNIX; 512 } else { 513 dprintk("RPC_AUTH_UNIX with invalid" 514 "uid or gid ignoring!\n"); 515 } 516 } 517 break; 518 case RPC_AUTH_GSS: 519 dprintk("RPC_AUTH_GSS callback secflavor " 520 "not supported!\n"); 521 READ_BUF(8); 522 /* gcbp_service */ 523 dummy = be32_to_cpup(p++); 524 /* gcbp_handle_from_server */ 525 dummy = be32_to_cpup(p++); 526 READ_BUF(dummy); 527 p += XDR_QUADLEN(dummy); 528 /* gcbp_handle_from_client */ 529 READ_BUF(4); 530 dummy = be32_to_cpup(p++); 531 READ_BUF(dummy); 532 break; 533 default: 534 dprintk("Illegal callback secflavor\n"); 535 return nfserr_inval; 536 } 537 } 538 DECODE_TAIL; 539 } 540 541 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc) 542 { 543 DECODE_HEAD; 544 545 READ_BUF(4); 546 bc->bc_cb_program = be32_to_cpup(p++); 547 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec); 548 549 DECODE_TAIL; 550 } 551 552 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts) 553 { 554 DECODE_HEAD; 555 556 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8); 557 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN); 558 bcts->dir = be32_to_cpup(p++); 559 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker 560 * could help us figure out we should be using it. */ 561 DECODE_TAIL; 562 } 563 564 static __be32 565 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close) 566 { 567 DECODE_HEAD; 568 569 READ_BUF(4); 570 close->cl_seqid = be32_to_cpup(p++); 571 return nfsd4_decode_stateid(argp, &close->cl_stateid); 572 573 DECODE_TAIL; 574 } 575 576 577 static __be32 578 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit) 579 { 580 DECODE_HEAD; 581 582 READ_BUF(12); 583 p = xdr_decode_hyper(p, &commit->co_offset); 584 commit->co_count = be32_to_cpup(p++); 585 586 DECODE_TAIL; 587 } 588 589 static __be32 590 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create) 591 { 592 DECODE_HEAD; 593 594 READ_BUF(4); 595 create->cr_type = be32_to_cpup(p++); 596 switch (create->cr_type) { 597 case NF4LNK: 598 READ_BUF(4); 599 create->cr_datalen = be32_to_cpup(p++); 600 READ_BUF(create->cr_datalen); 601 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen); 602 if (!create->cr_data) 603 return nfserr_jukebox; 604 break; 605 case NF4BLK: 606 case NF4CHR: 607 READ_BUF(8); 608 create->cr_specdata1 = be32_to_cpup(p++); 609 create->cr_specdata2 = be32_to_cpup(p++); 610 break; 611 case NF4SOCK: 612 case NF4FIFO: 613 case NF4DIR: 614 default: 615 break; 616 } 617 618 READ_BUF(4); 619 create->cr_namelen = be32_to_cpup(p++); 620 READ_BUF(create->cr_namelen); 621 SAVEMEM(create->cr_name, create->cr_namelen); 622 if ((status = check_filename(create->cr_name, create->cr_namelen))) 623 return status; 624 625 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr, 626 &create->cr_acl, &create->cr_label); 627 if (status) 628 goto out; 629 630 DECODE_TAIL; 631 } 632 633 static inline __be32 634 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr) 635 { 636 return nfsd4_decode_stateid(argp, &dr->dr_stateid); 637 } 638 639 static inline __be32 640 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr) 641 { 642 return nfsd4_decode_bitmap(argp, getattr->ga_bmval); 643 } 644 645 static __be32 646 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link) 647 { 648 DECODE_HEAD; 649 650 READ_BUF(4); 651 link->li_namelen = be32_to_cpup(p++); 652 READ_BUF(link->li_namelen); 653 SAVEMEM(link->li_name, link->li_namelen); 654 if ((status = check_filename(link->li_name, link->li_namelen))) 655 return status; 656 657 DECODE_TAIL; 658 } 659 660 static __be32 661 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock) 662 { 663 DECODE_HEAD; 664 665 /* 666 * type, reclaim(boolean), offset, length, new_lock_owner(boolean) 667 */ 668 READ_BUF(28); 669 lock->lk_type = be32_to_cpup(p++); 670 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT)) 671 goto xdr_error; 672 lock->lk_reclaim = be32_to_cpup(p++); 673 p = xdr_decode_hyper(p, &lock->lk_offset); 674 p = xdr_decode_hyper(p, &lock->lk_length); 675 lock->lk_is_new = be32_to_cpup(p++); 676 677 if (lock->lk_is_new) { 678 READ_BUF(4); 679 lock->lk_new_open_seqid = be32_to_cpup(p++); 680 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid); 681 if (status) 682 return status; 683 READ_BUF(8 + sizeof(clientid_t)); 684 lock->lk_new_lock_seqid = be32_to_cpup(p++); 685 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t)); 686 lock->lk_new_owner.len = be32_to_cpup(p++); 687 READ_BUF(lock->lk_new_owner.len); 688 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len); 689 } else { 690 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid); 691 if (status) 692 return status; 693 READ_BUF(4); 694 lock->lk_old_lock_seqid = be32_to_cpup(p++); 695 } 696 697 DECODE_TAIL; 698 } 699 700 static __be32 701 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt) 702 { 703 DECODE_HEAD; 704 705 READ_BUF(32); 706 lockt->lt_type = be32_to_cpup(p++); 707 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT)) 708 goto xdr_error; 709 p = xdr_decode_hyper(p, &lockt->lt_offset); 710 p = xdr_decode_hyper(p, &lockt->lt_length); 711 COPYMEM(&lockt->lt_clientid, 8); 712 lockt->lt_owner.len = be32_to_cpup(p++); 713 READ_BUF(lockt->lt_owner.len); 714 READMEM(lockt->lt_owner.data, lockt->lt_owner.len); 715 716 DECODE_TAIL; 717 } 718 719 static __be32 720 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku) 721 { 722 DECODE_HEAD; 723 724 READ_BUF(8); 725 locku->lu_type = be32_to_cpup(p++); 726 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT)) 727 goto xdr_error; 728 locku->lu_seqid = be32_to_cpup(p++); 729 status = nfsd4_decode_stateid(argp, &locku->lu_stateid); 730 if (status) 731 return status; 732 READ_BUF(16); 733 p = xdr_decode_hyper(p, &locku->lu_offset); 734 p = xdr_decode_hyper(p, &locku->lu_length); 735 736 DECODE_TAIL; 737 } 738 739 static __be32 740 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup) 741 { 742 DECODE_HEAD; 743 744 READ_BUF(4); 745 lookup->lo_len = be32_to_cpup(p++); 746 READ_BUF(lookup->lo_len); 747 SAVEMEM(lookup->lo_name, lookup->lo_len); 748 if ((status = check_filename(lookup->lo_name, lookup->lo_len))) 749 return status; 750 751 DECODE_TAIL; 752 } 753 754 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when) 755 { 756 __be32 *p; 757 u32 w; 758 759 READ_BUF(4); 760 w = be32_to_cpup(p++); 761 *share_access = w & NFS4_SHARE_ACCESS_MASK; 762 *deleg_want = w & NFS4_SHARE_WANT_MASK; 763 if (deleg_when) 764 *deleg_when = w & NFS4_SHARE_WHEN_MASK; 765 766 switch (w & NFS4_SHARE_ACCESS_MASK) { 767 case NFS4_SHARE_ACCESS_READ: 768 case NFS4_SHARE_ACCESS_WRITE: 769 case NFS4_SHARE_ACCESS_BOTH: 770 break; 771 default: 772 return nfserr_bad_xdr; 773 } 774 w &= ~NFS4_SHARE_ACCESS_MASK; 775 if (!w) 776 return nfs_ok; 777 if (!argp->minorversion) 778 return nfserr_bad_xdr; 779 switch (w & NFS4_SHARE_WANT_MASK) { 780 case NFS4_SHARE_WANT_NO_PREFERENCE: 781 case NFS4_SHARE_WANT_READ_DELEG: 782 case NFS4_SHARE_WANT_WRITE_DELEG: 783 case NFS4_SHARE_WANT_ANY_DELEG: 784 case NFS4_SHARE_WANT_NO_DELEG: 785 case NFS4_SHARE_WANT_CANCEL: 786 break; 787 default: 788 return nfserr_bad_xdr; 789 } 790 w &= ~NFS4_SHARE_WANT_MASK; 791 if (!w) 792 return nfs_ok; 793 794 if (!deleg_when) /* open_downgrade */ 795 return nfserr_inval; 796 switch (w) { 797 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL: 798 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED: 799 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL | 800 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED): 801 return nfs_ok; 802 } 803 xdr_error: 804 return nfserr_bad_xdr; 805 } 806 807 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x) 808 { 809 __be32 *p; 810 811 READ_BUF(4); 812 *x = be32_to_cpup(p++); 813 /* Note: unlinke access bits, deny bits may be zero. */ 814 if (*x & ~NFS4_SHARE_DENY_BOTH) 815 return nfserr_bad_xdr; 816 return nfs_ok; 817 xdr_error: 818 return nfserr_bad_xdr; 819 } 820 821 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o) 822 { 823 __be32 *p; 824 825 READ_BUF(4); 826 o->len = be32_to_cpup(p++); 827 828 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT) 829 return nfserr_bad_xdr; 830 831 READ_BUF(o->len); 832 SAVEMEM(o->data, o->len); 833 return nfs_ok; 834 xdr_error: 835 return nfserr_bad_xdr; 836 } 837 838 static __be32 839 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open) 840 { 841 DECODE_HEAD; 842 u32 dummy; 843 844 memset(open->op_bmval, 0, sizeof(open->op_bmval)); 845 open->op_iattr.ia_valid = 0; 846 open->op_openowner = NULL; 847 848 open->op_xdr_error = 0; 849 /* seqid, share_access, share_deny, clientid, ownerlen */ 850 READ_BUF(4); 851 open->op_seqid = be32_to_cpup(p++); 852 /* decode, yet ignore deleg_when until supported */ 853 status = nfsd4_decode_share_access(argp, &open->op_share_access, 854 &open->op_deleg_want, &dummy); 855 if (status) 856 goto xdr_error; 857 status = nfsd4_decode_share_deny(argp, &open->op_share_deny); 858 if (status) 859 goto xdr_error; 860 READ_BUF(sizeof(clientid_t)); 861 COPYMEM(&open->op_clientid, sizeof(clientid_t)); 862 status = nfsd4_decode_opaque(argp, &open->op_owner); 863 if (status) 864 goto xdr_error; 865 READ_BUF(4); 866 open->op_create = be32_to_cpup(p++); 867 switch (open->op_create) { 868 case NFS4_OPEN_NOCREATE: 869 break; 870 case NFS4_OPEN_CREATE: 871 READ_BUF(4); 872 open->op_createmode = be32_to_cpup(p++); 873 switch (open->op_createmode) { 874 case NFS4_CREATE_UNCHECKED: 875 case NFS4_CREATE_GUARDED: 876 status = nfsd4_decode_fattr(argp, open->op_bmval, 877 &open->op_iattr, &open->op_acl, &open->op_label); 878 if (status) 879 goto out; 880 break; 881 case NFS4_CREATE_EXCLUSIVE: 882 READ_BUF(NFS4_VERIFIER_SIZE); 883 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE); 884 break; 885 case NFS4_CREATE_EXCLUSIVE4_1: 886 if (argp->minorversion < 1) 887 goto xdr_error; 888 READ_BUF(NFS4_VERIFIER_SIZE); 889 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE); 890 status = nfsd4_decode_fattr(argp, open->op_bmval, 891 &open->op_iattr, &open->op_acl, &open->op_label); 892 if (status) 893 goto out; 894 break; 895 default: 896 goto xdr_error; 897 } 898 break; 899 default: 900 goto xdr_error; 901 } 902 903 /* open_claim */ 904 READ_BUF(4); 905 open->op_claim_type = be32_to_cpup(p++); 906 switch (open->op_claim_type) { 907 case NFS4_OPEN_CLAIM_NULL: 908 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 909 READ_BUF(4); 910 open->op_fname.len = be32_to_cpup(p++); 911 READ_BUF(open->op_fname.len); 912 SAVEMEM(open->op_fname.data, open->op_fname.len); 913 if ((status = check_filename(open->op_fname.data, open->op_fname.len))) 914 return status; 915 break; 916 case NFS4_OPEN_CLAIM_PREVIOUS: 917 READ_BUF(4); 918 open->op_delegate_type = be32_to_cpup(p++); 919 break; 920 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 921 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid); 922 if (status) 923 return status; 924 READ_BUF(4); 925 open->op_fname.len = be32_to_cpup(p++); 926 READ_BUF(open->op_fname.len); 927 SAVEMEM(open->op_fname.data, open->op_fname.len); 928 if ((status = check_filename(open->op_fname.data, open->op_fname.len))) 929 return status; 930 break; 931 case NFS4_OPEN_CLAIM_FH: 932 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 933 if (argp->minorversion < 1) 934 goto xdr_error; 935 /* void */ 936 break; 937 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 938 if (argp->minorversion < 1) 939 goto xdr_error; 940 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid); 941 if (status) 942 return status; 943 break; 944 default: 945 goto xdr_error; 946 } 947 948 DECODE_TAIL; 949 } 950 951 static __be32 952 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf) 953 { 954 DECODE_HEAD; 955 956 if (argp->minorversion >= 1) 957 return nfserr_notsupp; 958 959 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid); 960 if (status) 961 return status; 962 READ_BUF(4); 963 open_conf->oc_seqid = be32_to_cpup(p++); 964 965 DECODE_TAIL; 966 } 967 968 static __be32 969 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down) 970 { 971 DECODE_HEAD; 972 973 status = nfsd4_decode_stateid(argp, &open_down->od_stateid); 974 if (status) 975 return status; 976 READ_BUF(4); 977 open_down->od_seqid = be32_to_cpup(p++); 978 status = nfsd4_decode_share_access(argp, &open_down->od_share_access, 979 &open_down->od_deleg_want, NULL); 980 if (status) 981 return status; 982 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny); 983 if (status) 984 return status; 985 DECODE_TAIL; 986 } 987 988 static __be32 989 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh) 990 { 991 DECODE_HEAD; 992 993 READ_BUF(4); 994 putfh->pf_fhlen = be32_to_cpup(p++); 995 if (putfh->pf_fhlen > NFS4_FHSIZE) 996 goto xdr_error; 997 READ_BUF(putfh->pf_fhlen); 998 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen); 999 1000 DECODE_TAIL; 1001 } 1002 1003 static __be32 1004 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p) 1005 { 1006 if (argp->minorversion == 0) 1007 return nfs_ok; 1008 return nfserr_notsupp; 1009 } 1010 1011 static __be32 1012 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read) 1013 { 1014 DECODE_HEAD; 1015 1016 status = nfsd4_decode_stateid(argp, &read->rd_stateid); 1017 if (status) 1018 return status; 1019 READ_BUF(12); 1020 p = xdr_decode_hyper(p, &read->rd_offset); 1021 read->rd_length = be32_to_cpup(p++); 1022 1023 DECODE_TAIL; 1024 } 1025 1026 static __be32 1027 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir) 1028 { 1029 DECODE_HEAD; 1030 1031 READ_BUF(24); 1032 p = xdr_decode_hyper(p, &readdir->rd_cookie); 1033 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data)); 1034 readdir->rd_dircount = be32_to_cpup(p++); 1035 readdir->rd_maxcount = be32_to_cpup(p++); 1036 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval))) 1037 goto out; 1038 1039 DECODE_TAIL; 1040 } 1041 1042 static __be32 1043 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove) 1044 { 1045 DECODE_HEAD; 1046 1047 READ_BUF(4); 1048 remove->rm_namelen = be32_to_cpup(p++); 1049 READ_BUF(remove->rm_namelen); 1050 SAVEMEM(remove->rm_name, remove->rm_namelen); 1051 if ((status = check_filename(remove->rm_name, remove->rm_namelen))) 1052 return status; 1053 1054 DECODE_TAIL; 1055 } 1056 1057 static __be32 1058 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename) 1059 { 1060 DECODE_HEAD; 1061 1062 READ_BUF(4); 1063 rename->rn_snamelen = be32_to_cpup(p++); 1064 READ_BUF(rename->rn_snamelen + 4); 1065 SAVEMEM(rename->rn_sname, rename->rn_snamelen); 1066 rename->rn_tnamelen = be32_to_cpup(p++); 1067 READ_BUF(rename->rn_tnamelen); 1068 SAVEMEM(rename->rn_tname, rename->rn_tnamelen); 1069 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen))) 1070 return status; 1071 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen))) 1072 return status; 1073 1074 DECODE_TAIL; 1075 } 1076 1077 static __be32 1078 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid) 1079 { 1080 DECODE_HEAD; 1081 1082 if (argp->minorversion >= 1) 1083 return nfserr_notsupp; 1084 1085 READ_BUF(sizeof(clientid_t)); 1086 COPYMEM(clientid, sizeof(clientid_t)); 1087 1088 DECODE_TAIL; 1089 } 1090 1091 static __be32 1092 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp, 1093 struct nfsd4_secinfo *secinfo) 1094 { 1095 DECODE_HEAD; 1096 1097 READ_BUF(4); 1098 secinfo->si_namelen = be32_to_cpup(p++); 1099 READ_BUF(secinfo->si_namelen); 1100 SAVEMEM(secinfo->si_name, secinfo->si_namelen); 1101 status = check_filename(secinfo->si_name, secinfo->si_namelen); 1102 if (status) 1103 return status; 1104 DECODE_TAIL; 1105 } 1106 1107 static __be32 1108 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp, 1109 struct nfsd4_secinfo_no_name *sin) 1110 { 1111 DECODE_HEAD; 1112 1113 READ_BUF(4); 1114 sin->sin_style = be32_to_cpup(p++); 1115 DECODE_TAIL; 1116 } 1117 1118 static __be32 1119 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr) 1120 { 1121 __be32 status; 1122 1123 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid); 1124 if (status) 1125 return status; 1126 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, 1127 &setattr->sa_acl, &setattr->sa_label); 1128 } 1129 1130 static __be32 1131 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid) 1132 { 1133 DECODE_HEAD; 1134 1135 if (argp->minorversion >= 1) 1136 return nfserr_notsupp; 1137 1138 READ_BUF(NFS4_VERIFIER_SIZE); 1139 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE); 1140 1141 status = nfsd4_decode_opaque(argp, &setclientid->se_name); 1142 if (status) 1143 return nfserr_bad_xdr; 1144 READ_BUF(8); 1145 setclientid->se_callback_prog = be32_to_cpup(p++); 1146 setclientid->se_callback_netid_len = be32_to_cpup(p++); 1147 1148 READ_BUF(setclientid->se_callback_netid_len + 4); 1149 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len); 1150 setclientid->se_callback_addr_len = be32_to_cpup(p++); 1151 1152 READ_BUF(setclientid->se_callback_addr_len + 4); 1153 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len); 1154 setclientid->se_callback_ident = be32_to_cpup(p++); 1155 1156 DECODE_TAIL; 1157 } 1158 1159 static __be32 1160 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c) 1161 { 1162 DECODE_HEAD; 1163 1164 if (argp->minorversion >= 1) 1165 return nfserr_notsupp; 1166 1167 READ_BUF(8 + NFS4_VERIFIER_SIZE); 1168 COPYMEM(&scd_c->sc_clientid, 8); 1169 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE); 1170 1171 DECODE_TAIL; 1172 } 1173 1174 /* Also used for NVERIFY */ 1175 static __be32 1176 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify) 1177 { 1178 DECODE_HEAD; 1179 1180 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval))) 1181 goto out; 1182 1183 /* For convenience's sake, we compare raw xdr'd attributes in 1184 * nfsd4_proc_verify */ 1185 1186 READ_BUF(4); 1187 verify->ve_attrlen = be32_to_cpup(p++); 1188 READ_BUF(verify->ve_attrlen); 1189 SAVEMEM(verify->ve_attrval, verify->ve_attrlen); 1190 1191 DECODE_TAIL; 1192 } 1193 1194 static __be32 1195 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) 1196 { 1197 int avail; 1198 int len; 1199 DECODE_HEAD; 1200 1201 status = nfsd4_decode_stateid(argp, &write->wr_stateid); 1202 if (status) 1203 return status; 1204 READ_BUF(16); 1205 p = xdr_decode_hyper(p, &write->wr_offset); 1206 write->wr_stable_how = be32_to_cpup(p++); 1207 if (write->wr_stable_how > 2) 1208 goto xdr_error; 1209 write->wr_buflen = be32_to_cpup(p++); 1210 1211 /* Sorry .. no magic macros for this.. * 1212 * READ_BUF(write->wr_buflen); 1213 * SAVEMEM(write->wr_buf, write->wr_buflen); 1214 */ 1215 avail = (char*)argp->end - (char*)argp->p; 1216 if (avail + argp->pagelen < write->wr_buflen) { 1217 dprintk("NFSD: xdr error (%s:%d)\n", 1218 __FILE__, __LINE__); 1219 goto xdr_error; 1220 } 1221 write->wr_head.iov_base = p; 1222 write->wr_head.iov_len = avail; 1223 write->wr_pagelist = argp->pagelist; 1224 1225 len = XDR_QUADLEN(write->wr_buflen) << 2; 1226 if (len >= avail) { 1227 int pages; 1228 1229 len -= avail; 1230 1231 pages = len >> PAGE_SHIFT; 1232 argp->pagelist += pages; 1233 argp->pagelen -= pages * PAGE_SIZE; 1234 len -= pages * PAGE_SIZE; 1235 1236 argp->p = (__be32 *)page_address(argp->pagelist[0]); 1237 argp->pagelist++; 1238 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE); 1239 } 1240 argp->p += XDR_QUADLEN(len); 1241 1242 DECODE_TAIL; 1243 } 1244 1245 static __be32 1246 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner) 1247 { 1248 DECODE_HEAD; 1249 1250 if (argp->minorversion >= 1) 1251 return nfserr_notsupp; 1252 1253 READ_BUF(12); 1254 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t)); 1255 rlockowner->rl_owner.len = be32_to_cpup(p++); 1256 READ_BUF(rlockowner->rl_owner.len); 1257 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len); 1258 1259 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid)) 1260 return nfserr_inval; 1261 DECODE_TAIL; 1262 } 1263 1264 static __be32 1265 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp, 1266 struct nfsd4_exchange_id *exid) 1267 { 1268 int dummy, tmp; 1269 DECODE_HEAD; 1270 1271 READ_BUF(NFS4_VERIFIER_SIZE); 1272 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE); 1273 1274 status = nfsd4_decode_opaque(argp, &exid->clname); 1275 if (status) 1276 return nfserr_bad_xdr; 1277 1278 READ_BUF(4); 1279 exid->flags = be32_to_cpup(p++); 1280 1281 /* Ignore state_protect4_a */ 1282 READ_BUF(4); 1283 exid->spa_how = be32_to_cpup(p++); 1284 switch (exid->spa_how) { 1285 case SP4_NONE: 1286 break; 1287 case SP4_MACH_CRED: 1288 /* spo_must_enforce */ 1289 READ_BUF(4); 1290 dummy = be32_to_cpup(p++); 1291 READ_BUF(dummy * 4); 1292 p += dummy; 1293 1294 /* spo_must_allow */ 1295 READ_BUF(4); 1296 dummy = be32_to_cpup(p++); 1297 READ_BUF(dummy * 4); 1298 p += dummy; 1299 break; 1300 case SP4_SSV: 1301 /* ssp_ops */ 1302 READ_BUF(4); 1303 dummy = be32_to_cpup(p++); 1304 READ_BUF(dummy * 4); 1305 p += dummy; 1306 1307 READ_BUF(4); 1308 dummy = be32_to_cpup(p++); 1309 READ_BUF(dummy * 4); 1310 p += dummy; 1311 1312 /* ssp_hash_algs<> */ 1313 READ_BUF(4); 1314 tmp = be32_to_cpup(p++); 1315 while (tmp--) { 1316 READ_BUF(4); 1317 dummy = be32_to_cpup(p++); 1318 READ_BUF(dummy); 1319 p += XDR_QUADLEN(dummy); 1320 } 1321 1322 /* ssp_encr_algs<> */ 1323 READ_BUF(4); 1324 tmp = be32_to_cpup(p++); 1325 while (tmp--) { 1326 READ_BUF(4); 1327 dummy = be32_to_cpup(p++); 1328 READ_BUF(dummy); 1329 p += XDR_QUADLEN(dummy); 1330 } 1331 1332 /* ssp_window and ssp_num_gss_handles */ 1333 READ_BUF(8); 1334 dummy = be32_to_cpup(p++); 1335 dummy = be32_to_cpup(p++); 1336 break; 1337 default: 1338 goto xdr_error; 1339 } 1340 1341 /* Ignore Implementation ID */ 1342 READ_BUF(4); /* nfs_impl_id4 array length */ 1343 dummy = be32_to_cpup(p++); 1344 1345 if (dummy > 1) 1346 goto xdr_error; 1347 1348 if (dummy == 1) { 1349 /* nii_domain */ 1350 READ_BUF(4); 1351 dummy = be32_to_cpup(p++); 1352 READ_BUF(dummy); 1353 p += XDR_QUADLEN(dummy); 1354 1355 /* nii_name */ 1356 READ_BUF(4); 1357 dummy = be32_to_cpup(p++); 1358 READ_BUF(dummy); 1359 p += XDR_QUADLEN(dummy); 1360 1361 /* nii_date */ 1362 READ_BUF(12); 1363 p += 3; 1364 } 1365 DECODE_TAIL; 1366 } 1367 1368 static __be32 1369 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp, 1370 struct nfsd4_create_session *sess) 1371 { 1372 DECODE_HEAD; 1373 u32 dummy; 1374 1375 READ_BUF(16); 1376 COPYMEM(&sess->clientid, 8); 1377 sess->seqid = be32_to_cpup(p++); 1378 sess->flags = be32_to_cpup(p++); 1379 1380 /* Fore channel attrs */ 1381 READ_BUF(28); 1382 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */ 1383 sess->fore_channel.maxreq_sz = be32_to_cpup(p++); 1384 sess->fore_channel.maxresp_sz = be32_to_cpup(p++); 1385 sess->fore_channel.maxresp_cached = be32_to_cpup(p++); 1386 sess->fore_channel.maxops = be32_to_cpup(p++); 1387 sess->fore_channel.maxreqs = be32_to_cpup(p++); 1388 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++); 1389 if (sess->fore_channel.nr_rdma_attrs == 1) { 1390 READ_BUF(4); 1391 sess->fore_channel.rdma_attrs = be32_to_cpup(p++); 1392 } else if (sess->fore_channel.nr_rdma_attrs > 1) { 1393 dprintk("Too many fore channel attr bitmaps!\n"); 1394 goto xdr_error; 1395 } 1396 1397 /* Back channel attrs */ 1398 READ_BUF(28); 1399 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */ 1400 sess->back_channel.maxreq_sz = be32_to_cpup(p++); 1401 sess->back_channel.maxresp_sz = be32_to_cpup(p++); 1402 sess->back_channel.maxresp_cached = be32_to_cpup(p++); 1403 sess->back_channel.maxops = be32_to_cpup(p++); 1404 sess->back_channel.maxreqs = be32_to_cpup(p++); 1405 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++); 1406 if (sess->back_channel.nr_rdma_attrs == 1) { 1407 READ_BUF(4); 1408 sess->back_channel.rdma_attrs = be32_to_cpup(p++); 1409 } else if (sess->back_channel.nr_rdma_attrs > 1) { 1410 dprintk("Too many back channel attr bitmaps!\n"); 1411 goto xdr_error; 1412 } 1413 1414 READ_BUF(4); 1415 sess->callback_prog = be32_to_cpup(p++); 1416 nfsd4_decode_cb_sec(argp, &sess->cb_sec); 1417 DECODE_TAIL; 1418 } 1419 1420 static __be32 1421 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp, 1422 struct nfsd4_destroy_session *destroy_session) 1423 { 1424 DECODE_HEAD; 1425 READ_BUF(NFS4_MAX_SESSIONID_LEN); 1426 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN); 1427 1428 DECODE_TAIL; 1429 } 1430 1431 static __be32 1432 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp, 1433 struct nfsd4_free_stateid *free_stateid) 1434 { 1435 DECODE_HEAD; 1436 1437 READ_BUF(sizeof(stateid_t)); 1438 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++); 1439 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t)); 1440 1441 DECODE_TAIL; 1442 } 1443 1444 static __be32 1445 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp, 1446 struct nfsd4_sequence *seq) 1447 { 1448 DECODE_HEAD; 1449 1450 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); 1451 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN); 1452 seq->seqid = be32_to_cpup(p++); 1453 seq->slotid = be32_to_cpup(p++); 1454 seq->maxslots = be32_to_cpup(p++); 1455 seq->cachethis = be32_to_cpup(p++); 1456 1457 DECODE_TAIL; 1458 } 1459 1460 static __be32 1461 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid) 1462 { 1463 int i; 1464 __be32 *p, status; 1465 struct nfsd4_test_stateid_id *stateid; 1466 1467 READ_BUF(4); 1468 test_stateid->ts_num_ids = ntohl(*p++); 1469 1470 INIT_LIST_HEAD(&test_stateid->ts_stateid_list); 1471 1472 for (i = 0; i < test_stateid->ts_num_ids; i++) { 1473 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); 1474 if (!stateid) { 1475 status = nfserrno(-ENOMEM); 1476 goto out; 1477 } 1478 1479 INIT_LIST_HEAD(&stateid->ts_id_list); 1480 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); 1481 1482 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid); 1483 if (status) 1484 goto out; 1485 } 1486 1487 status = 0; 1488 out: 1489 return status; 1490 xdr_error: 1491 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__); 1492 status = nfserr_bad_xdr; 1493 goto out; 1494 } 1495 1496 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc) 1497 { 1498 DECODE_HEAD; 1499 1500 READ_BUF(8); 1501 COPYMEM(&dc->clientid, 8); 1502 1503 DECODE_TAIL; 1504 } 1505 1506 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc) 1507 { 1508 DECODE_HEAD; 1509 1510 READ_BUF(4); 1511 rc->rca_one_fs = be32_to_cpup(p++); 1512 1513 DECODE_TAIL; 1514 } 1515 1516 static __be32 1517 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek) 1518 { 1519 DECODE_HEAD; 1520 1521 status = nfsd4_decode_stateid(argp, &seek->seek_stateid); 1522 if (status) 1523 return status; 1524 1525 READ_BUF(8 + 4); 1526 p = xdr_decode_hyper(p, &seek->seek_offset); 1527 seek->seek_whence = be32_to_cpup(p); 1528 1529 DECODE_TAIL; 1530 } 1531 1532 static __be32 1533 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p) 1534 { 1535 return nfs_ok; 1536 } 1537 1538 static __be32 1539 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p) 1540 { 1541 return nfserr_notsupp; 1542 } 1543 1544 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *); 1545 1546 static nfsd4_dec nfsd4_dec_ops[] = { 1547 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access, 1548 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close, 1549 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit, 1550 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create, 1551 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp, 1552 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn, 1553 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr, 1554 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop, 1555 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link, 1556 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock, 1557 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt, 1558 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku, 1559 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup, 1560 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop, 1561 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify, 1562 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open, 1563 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp, 1564 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm, 1565 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade, 1566 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh, 1567 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh, 1568 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop, 1569 [OP_READ] = (nfsd4_dec)nfsd4_decode_read, 1570 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir, 1571 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop, 1572 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove, 1573 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename, 1574 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew, 1575 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop, 1576 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop, 1577 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo, 1578 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr, 1579 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid, 1580 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm, 1581 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify, 1582 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write, 1583 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner, 1584 1585 /* new operations for NFSv4.1 */ 1586 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl, 1587 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session, 1588 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id, 1589 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session, 1590 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session, 1591 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid, 1592 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 1593 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp, 1594 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp, 1595 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp, 1596 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp, 1597 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp, 1598 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name, 1599 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence, 1600 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp, 1601 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid, 1602 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp, 1603 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid, 1604 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete, 1605 1606 /* new operations for NFSv4.2 */ 1607 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_notsupp, 1608 [OP_COPY] = (nfsd4_dec)nfsd4_decode_notsupp, 1609 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp, 1610 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_notsupp, 1611 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp, 1612 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp, 1613 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp, 1614 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp, 1615 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp, 1616 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp, 1617 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek, 1618 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp, 1619 }; 1620 1621 static inline bool 1622 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op) 1623 { 1624 if (op->opnum < FIRST_NFS4_OP) 1625 return false; 1626 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP) 1627 return false; 1628 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP) 1629 return false; 1630 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP) 1631 return false; 1632 return true; 1633 } 1634 1635 static __be32 1636 nfsd4_decode_compound(struct nfsd4_compoundargs *argp) 1637 { 1638 DECODE_HEAD; 1639 struct nfsd4_op *op; 1640 bool cachethis = false; 1641 int auth_slack= argp->rqstp->rq_auth_slack; 1642 int max_reply = auth_slack + 8; /* opcnt, status */ 1643 int readcount = 0; 1644 int readbytes = 0; 1645 int i; 1646 1647 READ_BUF(4); 1648 argp->taglen = be32_to_cpup(p++); 1649 READ_BUF(argp->taglen + 8); 1650 SAVEMEM(argp->tag, argp->taglen); 1651 argp->minorversion = be32_to_cpup(p++); 1652 argp->opcnt = be32_to_cpup(p++); 1653 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2); 1654 1655 if (argp->taglen > NFSD4_MAX_TAGLEN) 1656 goto xdr_error; 1657 if (argp->opcnt > 100) 1658 goto xdr_error; 1659 1660 if (argp->opcnt > ARRAY_SIZE(argp->iops)) { 1661 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL); 1662 if (!argp->ops) { 1663 argp->ops = argp->iops; 1664 dprintk("nfsd: couldn't allocate room for COMPOUND\n"); 1665 goto xdr_error; 1666 } 1667 } 1668 1669 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION) 1670 argp->opcnt = 0; 1671 1672 for (i = 0; i < argp->opcnt; i++) { 1673 op = &argp->ops[i]; 1674 op->replay = NULL; 1675 1676 READ_BUF(4); 1677 op->opnum = be32_to_cpup(p++); 1678 1679 if (nfsd4_opnum_in_range(argp, op)) 1680 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u); 1681 else { 1682 op->opnum = OP_ILLEGAL; 1683 op->status = nfserr_op_illegal; 1684 } 1685 /* 1686 * We'll try to cache the result in the DRC if any one 1687 * op in the compound wants to be cached: 1688 */ 1689 cachethis |= nfsd4_cache_this_op(op); 1690 1691 if (op->opnum == OP_READ) { 1692 readcount++; 1693 readbytes += nfsd4_max_reply(argp->rqstp, op); 1694 } else 1695 max_reply += nfsd4_max_reply(argp->rqstp, op); 1696 /* 1697 * OP_LOCK may return a conflicting lock. (Special case 1698 * because it will just skip encoding this if it runs 1699 * out of xdr buffer space, and it is the only operation 1700 * that behaves this way.) 1701 */ 1702 if (op->opnum == OP_LOCK) 1703 max_reply += NFS4_OPAQUE_LIMIT; 1704 1705 if (op->status) { 1706 argp->opcnt = i+1; 1707 break; 1708 } 1709 } 1710 /* Sessions make the DRC unnecessary: */ 1711 if (argp->minorversion) 1712 cachethis = false; 1713 svc_reserve(argp->rqstp, max_reply + readbytes); 1714 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE; 1715 1716 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack) 1717 argp->rqstp->rq_splice_ok = false; 1718 1719 DECODE_TAIL; 1720 } 1721 1722 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode) 1723 { 1724 if (IS_I_VERSION(inode)) { 1725 p = xdr_encode_hyper(p, inode->i_version); 1726 } else { 1727 *p++ = cpu_to_be32(stat->ctime.tv_sec); 1728 *p++ = cpu_to_be32(stat->ctime.tv_nsec); 1729 } 1730 return p; 1731 } 1732 1733 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c) 1734 { 1735 *p++ = cpu_to_be32(c->atomic); 1736 if (c->change_supported) { 1737 p = xdr_encode_hyper(p, c->before_change); 1738 p = xdr_encode_hyper(p, c->after_change); 1739 } else { 1740 *p++ = cpu_to_be32(c->before_ctime_sec); 1741 *p++ = cpu_to_be32(c->before_ctime_nsec); 1742 *p++ = cpu_to_be32(c->after_ctime_sec); 1743 *p++ = cpu_to_be32(c->after_ctime_nsec); 1744 } 1745 return p; 1746 } 1747 1748 /* Encode as an array of strings the string given with components 1749 * separated @sep, escaped with esc_enter and esc_exit. 1750 */ 1751 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep, 1752 char *components, char esc_enter, 1753 char esc_exit) 1754 { 1755 __be32 *p; 1756 __be32 pathlen; 1757 int pathlen_offset; 1758 int strlen, count=0; 1759 char *str, *end, *next; 1760 1761 dprintk("nfsd4_encode_components(%s)\n", components); 1762 1763 pathlen_offset = xdr->buf->len; 1764 p = xdr_reserve_space(xdr, 4); 1765 if (!p) 1766 return nfserr_resource; 1767 p++; /* We will fill this in with @count later */ 1768 1769 end = str = components; 1770 while (*end) { 1771 bool found_esc = false; 1772 1773 /* try to parse as esc_start, ..., esc_end, sep */ 1774 if (*str == esc_enter) { 1775 for (; *end && (*end != esc_exit); end++) 1776 /* find esc_exit or end of string */; 1777 next = end + 1; 1778 if (*end && (!*next || *next == sep)) { 1779 str++; 1780 found_esc = true; 1781 } 1782 } 1783 1784 if (!found_esc) 1785 for (; *end && (*end != sep); end++) 1786 /* find sep or end of string */; 1787 1788 strlen = end - str; 1789 if (strlen) { 1790 p = xdr_reserve_space(xdr, strlen + 4); 1791 if (!p) 1792 return nfserr_resource; 1793 p = xdr_encode_opaque(p, str, strlen); 1794 count++; 1795 } 1796 else 1797 end++; 1798 str = end; 1799 } 1800 pathlen = htonl(xdr->buf->len - pathlen_offset); 1801 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4); 1802 return 0; 1803 } 1804 1805 /* Encode as an array of strings the string given with components 1806 * separated @sep. 1807 */ 1808 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep, 1809 char *components) 1810 { 1811 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0); 1812 } 1813 1814 /* 1815 * encode a location element of a fs_locations structure 1816 */ 1817 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr, 1818 struct nfsd4_fs_location *location) 1819 { 1820 __be32 status; 1821 1822 status = nfsd4_encode_components_esc(xdr, ':', location->hosts, 1823 '[', ']'); 1824 if (status) 1825 return status; 1826 status = nfsd4_encode_components(xdr, '/', location->path); 1827 if (status) 1828 return status; 1829 return 0; 1830 } 1831 1832 /* 1833 * Encode a path in RFC3530 'pathname4' format 1834 */ 1835 static __be32 nfsd4_encode_path(struct xdr_stream *xdr, 1836 const struct path *root, 1837 const struct path *path) 1838 { 1839 struct path cur = *path; 1840 __be32 *p; 1841 struct dentry **components = NULL; 1842 unsigned int ncomponents = 0; 1843 __be32 err = nfserr_jukebox; 1844 1845 dprintk("nfsd4_encode_components("); 1846 1847 path_get(&cur); 1848 /* First walk the path up to the nfsd root, and store the 1849 * dentries/path components in an array. 1850 */ 1851 for (;;) { 1852 if (cur.dentry == root->dentry && cur.mnt == root->mnt) 1853 break; 1854 if (cur.dentry == cur.mnt->mnt_root) { 1855 if (follow_up(&cur)) 1856 continue; 1857 goto out_free; 1858 } 1859 if ((ncomponents & 15) == 0) { 1860 struct dentry **new; 1861 new = krealloc(components, 1862 sizeof(*new) * (ncomponents + 16), 1863 GFP_KERNEL); 1864 if (!new) 1865 goto out_free; 1866 components = new; 1867 } 1868 components[ncomponents++] = cur.dentry; 1869 cur.dentry = dget_parent(cur.dentry); 1870 } 1871 err = nfserr_resource; 1872 p = xdr_reserve_space(xdr, 4); 1873 if (!p) 1874 goto out_free; 1875 *p++ = cpu_to_be32(ncomponents); 1876 1877 while (ncomponents) { 1878 struct dentry *dentry = components[ncomponents - 1]; 1879 unsigned int len; 1880 1881 spin_lock(&dentry->d_lock); 1882 len = dentry->d_name.len; 1883 p = xdr_reserve_space(xdr, len + 4); 1884 if (!p) { 1885 spin_unlock(&dentry->d_lock); 1886 goto out_free; 1887 } 1888 p = xdr_encode_opaque(p, dentry->d_name.name, len); 1889 dprintk("/%s", dentry->d_name.name); 1890 spin_unlock(&dentry->d_lock); 1891 dput(dentry); 1892 ncomponents--; 1893 } 1894 1895 err = 0; 1896 out_free: 1897 dprintk(")\n"); 1898 while (ncomponents) 1899 dput(components[--ncomponents]); 1900 kfree(components); 1901 path_put(&cur); 1902 return err; 1903 } 1904 1905 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr, 1906 struct svc_rqst *rqstp, const struct path *path) 1907 { 1908 struct svc_export *exp_ps; 1909 __be32 res; 1910 1911 exp_ps = rqst_find_fsidzero_export(rqstp); 1912 if (IS_ERR(exp_ps)) 1913 return nfserrno(PTR_ERR(exp_ps)); 1914 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path); 1915 exp_put(exp_ps); 1916 return res; 1917 } 1918 1919 /* 1920 * encode a fs_locations structure 1921 */ 1922 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr, 1923 struct svc_rqst *rqstp, struct svc_export *exp) 1924 { 1925 __be32 status; 1926 int i; 1927 __be32 *p; 1928 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs; 1929 1930 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path); 1931 if (status) 1932 return status; 1933 p = xdr_reserve_space(xdr, 4); 1934 if (!p) 1935 return nfserr_resource; 1936 *p++ = cpu_to_be32(fslocs->locations_count); 1937 for (i=0; i<fslocs->locations_count; i++) { 1938 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]); 1939 if (status) 1940 return status; 1941 } 1942 return 0; 1943 } 1944 1945 static u32 nfs4_file_type(umode_t mode) 1946 { 1947 switch (mode & S_IFMT) { 1948 case S_IFIFO: return NF4FIFO; 1949 case S_IFCHR: return NF4CHR; 1950 case S_IFDIR: return NF4DIR; 1951 case S_IFBLK: return NF4BLK; 1952 case S_IFLNK: return NF4LNK; 1953 case S_IFREG: return NF4REG; 1954 case S_IFSOCK: return NF4SOCK; 1955 default: return NF4BAD; 1956 }; 1957 } 1958 1959 static inline __be32 1960 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp, 1961 struct nfs4_ace *ace) 1962 { 1963 if (ace->whotype != NFS4_ACL_WHO_NAMED) 1964 return nfs4_acl_write_who(xdr, ace->whotype); 1965 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP) 1966 return nfsd4_encode_group(xdr, rqstp, ace->who_gid); 1967 else 1968 return nfsd4_encode_user(xdr, rqstp, ace->who_uid); 1969 } 1970 1971 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \ 1972 FATTR4_WORD0_RDATTR_ERROR) 1973 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID 1974 1975 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 1976 static inline __be32 1977 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 1978 void *context, int len) 1979 { 1980 __be32 *p; 1981 1982 p = xdr_reserve_space(xdr, len + 4 + 4 + 4); 1983 if (!p) 1984 return nfserr_resource; 1985 1986 /* 1987 * For now we use a 0 here to indicate the null translation; in 1988 * the future we may place a call to translation code here. 1989 */ 1990 *p++ = cpu_to_be32(0); /* lfs */ 1991 *p++ = cpu_to_be32(0); /* pi */ 1992 p = xdr_encode_opaque(p, context, len); 1993 return 0; 1994 } 1995 #else 1996 static inline __be32 1997 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp, 1998 void *context, int len) 1999 { return 0; } 2000 #endif 2001 2002 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err) 2003 { 2004 /* As per referral draft: */ 2005 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS || 2006 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) { 2007 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR || 2008 *bmval0 & FATTR4_WORD0_FS_LOCATIONS) 2009 *rdattr_err = NFSERR_MOVED; 2010 else 2011 return nfserr_moved; 2012 } 2013 *bmval0 &= WORD0_ABSENT_FS_ATTRS; 2014 *bmval1 &= WORD1_ABSENT_FS_ATTRS; 2015 return 0; 2016 } 2017 2018 2019 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat) 2020 { 2021 struct path path = exp->ex_path; 2022 int err; 2023 2024 path_get(&path); 2025 while (follow_up(&path)) { 2026 if (path.dentry != path.mnt->mnt_root) 2027 break; 2028 } 2029 err = vfs_getattr(&path, stat); 2030 path_put(&path); 2031 return err; 2032 } 2033 2034 /* 2035 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle 2036 * ourselves. 2037 */ 2038 static __be32 2039 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, 2040 struct svc_export *exp, 2041 struct dentry *dentry, u32 *bmval, 2042 struct svc_rqst *rqstp, int ignore_crossmnt) 2043 { 2044 u32 bmval0 = bmval[0]; 2045 u32 bmval1 = bmval[1]; 2046 u32 bmval2 = bmval[2]; 2047 struct kstat stat; 2048 struct svc_fh *tempfh = NULL; 2049 struct kstatfs statfs; 2050 __be32 *p; 2051 int starting_len = xdr->buf->len; 2052 int attrlen_offset; 2053 __be32 attrlen; 2054 u32 dummy; 2055 u64 dummy64; 2056 u32 rdattr_err = 0; 2057 __be32 status; 2058 int err; 2059 int aclsupport = 0; 2060 struct nfs4_acl *acl = NULL; 2061 void *context = NULL; 2062 int contextlen; 2063 bool contextsupport = false; 2064 struct nfsd4_compoundres *resp = rqstp->rq_resp; 2065 u32 minorversion = resp->cstate.minorversion; 2066 struct path path = { 2067 .mnt = exp->ex_path.mnt, 2068 .dentry = dentry, 2069 }; 2070 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 2071 2072 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1); 2073 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion)); 2074 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion)); 2075 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion)); 2076 2077 if (exp->ex_fslocs.migrated) { 2078 BUG_ON(bmval[2]); 2079 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err); 2080 if (status) 2081 goto out; 2082 } 2083 2084 err = vfs_getattr(&path, &stat); 2085 if (err) 2086 goto out_nfserr; 2087 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE | 2088 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) || 2089 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | 2090 FATTR4_WORD1_SPACE_TOTAL))) { 2091 err = vfs_statfs(&path, &statfs); 2092 if (err) 2093 goto out_nfserr; 2094 } 2095 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) { 2096 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL); 2097 status = nfserr_jukebox; 2098 if (!tempfh) 2099 goto out; 2100 fh_init(tempfh, NFS4_FHSIZE); 2101 status = fh_compose(tempfh, exp, dentry, NULL); 2102 if (status) 2103 goto out; 2104 fhp = tempfh; 2105 } 2106 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT 2107 | FATTR4_WORD0_SUPPORTED_ATTRS)) { 2108 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl); 2109 aclsupport = (err == 0); 2110 if (bmval0 & FATTR4_WORD0_ACL) { 2111 if (err == -EOPNOTSUPP) 2112 bmval0 &= ~FATTR4_WORD0_ACL; 2113 else if (err == -EINVAL) { 2114 status = nfserr_attrnotsupp; 2115 goto out; 2116 } else if (err != 0) 2117 goto out_nfserr; 2118 } 2119 } 2120 2121 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2122 if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) || 2123 bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) { 2124 err = security_inode_getsecctx(dentry->d_inode, 2125 &context, &contextlen); 2126 contextsupport = (err == 0); 2127 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2128 if (err == -EOPNOTSUPP) 2129 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL; 2130 else if (err) 2131 goto out_nfserr; 2132 } 2133 } 2134 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2135 2136 if (bmval2) { 2137 p = xdr_reserve_space(xdr, 16); 2138 if (!p) 2139 goto out_resource; 2140 *p++ = cpu_to_be32(3); 2141 *p++ = cpu_to_be32(bmval0); 2142 *p++ = cpu_to_be32(bmval1); 2143 *p++ = cpu_to_be32(bmval2); 2144 } else if (bmval1) { 2145 p = xdr_reserve_space(xdr, 12); 2146 if (!p) 2147 goto out_resource; 2148 *p++ = cpu_to_be32(2); 2149 *p++ = cpu_to_be32(bmval0); 2150 *p++ = cpu_to_be32(bmval1); 2151 } else { 2152 p = xdr_reserve_space(xdr, 8); 2153 if (!p) 2154 goto out_resource; 2155 *p++ = cpu_to_be32(1); 2156 *p++ = cpu_to_be32(bmval0); 2157 } 2158 2159 attrlen_offset = xdr->buf->len; 2160 p = xdr_reserve_space(xdr, 4); 2161 if (!p) 2162 goto out_resource; 2163 p++; /* to be backfilled later */ 2164 2165 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) { 2166 u32 word0 = nfsd_suppattrs0(minorversion); 2167 u32 word1 = nfsd_suppattrs1(minorversion); 2168 u32 word2 = nfsd_suppattrs2(minorversion); 2169 2170 if (!aclsupport) 2171 word0 &= ~FATTR4_WORD0_ACL; 2172 if (!contextsupport) 2173 word2 &= ~FATTR4_WORD2_SECURITY_LABEL; 2174 if (!word2) { 2175 p = xdr_reserve_space(xdr, 12); 2176 if (!p) 2177 goto out_resource; 2178 *p++ = cpu_to_be32(2); 2179 *p++ = cpu_to_be32(word0); 2180 *p++ = cpu_to_be32(word1); 2181 } else { 2182 p = xdr_reserve_space(xdr, 16); 2183 if (!p) 2184 goto out_resource; 2185 *p++ = cpu_to_be32(3); 2186 *p++ = cpu_to_be32(word0); 2187 *p++ = cpu_to_be32(word1); 2188 *p++ = cpu_to_be32(word2); 2189 } 2190 } 2191 if (bmval0 & FATTR4_WORD0_TYPE) { 2192 p = xdr_reserve_space(xdr, 4); 2193 if (!p) 2194 goto out_resource; 2195 dummy = nfs4_file_type(stat.mode); 2196 if (dummy == NF4BAD) { 2197 status = nfserr_serverfault; 2198 goto out; 2199 } 2200 *p++ = cpu_to_be32(dummy); 2201 } 2202 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) { 2203 p = xdr_reserve_space(xdr, 4); 2204 if (!p) 2205 goto out_resource; 2206 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) 2207 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT); 2208 else 2209 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT| 2210 NFS4_FH_VOL_RENAME); 2211 } 2212 if (bmval0 & FATTR4_WORD0_CHANGE) { 2213 p = xdr_reserve_space(xdr, 8); 2214 if (!p) 2215 goto out_resource; 2216 p = encode_change(p, &stat, dentry->d_inode); 2217 } 2218 if (bmval0 & FATTR4_WORD0_SIZE) { 2219 p = xdr_reserve_space(xdr, 8); 2220 if (!p) 2221 goto out_resource; 2222 p = xdr_encode_hyper(p, stat.size); 2223 } 2224 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) { 2225 p = xdr_reserve_space(xdr, 4); 2226 if (!p) 2227 goto out_resource; 2228 *p++ = cpu_to_be32(1); 2229 } 2230 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) { 2231 p = xdr_reserve_space(xdr, 4); 2232 if (!p) 2233 goto out_resource; 2234 *p++ = cpu_to_be32(1); 2235 } 2236 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) { 2237 p = xdr_reserve_space(xdr, 4); 2238 if (!p) 2239 goto out_resource; 2240 *p++ = cpu_to_be32(0); 2241 } 2242 if (bmval0 & FATTR4_WORD0_FSID) { 2243 p = xdr_reserve_space(xdr, 16); 2244 if (!p) 2245 goto out_resource; 2246 if (exp->ex_fslocs.migrated) { 2247 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR); 2248 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR); 2249 } else switch(fsid_source(fhp)) { 2250 case FSIDSOURCE_FSID: 2251 p = xdr_encode_hyper(p, (u64)exp->ex_fsid); 2252 p = xdr_encode_hyper(p, (u64)0); 2253 break; 2254 case FSIDSOURCE_DEV: 2255 *p++ = cpu_to_be32(0); 2256 *p++ = cpu_to_be32(MAJOR(stat.dev)); 2257 *p++ = cpu_to_be32(0); 2258 *p++ = cpu_to_be32(MINOR(stat.dev)); 2259 break; 2260 case FSIDSOURCE_UUID: 2261 p = xdr_encode_opaque_fixed(p, exp->ex_uuid, 2262 EX_UUID_LEN); 2263 break; 2264 } 2265 } 2266 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) { 2267 p = xdr_reserve_space(xdr, 4); 2268 if (!p) 2269 goto out_resource; 2270 *p++ = cpu_to_be32(0); 2271 } 2272 if (bmval0 & FATTR4_WORD0_LEASE_TIME) { 2273 p = xdr_reserve_space(xdr, 4); 2274 if (!p) 2275 goto out_resource; 2276 *p++ = cpu_to_be32(nn->nfsd4_lease); 2277 } 2278 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) { 2279 p = xdr_reserve_space(xdr, 4); 2280 if (!p) 2281 goto out_resource; 2282 *p++ = cpu_to_be32(rdattr_err); 2283 } 2284 if (bmval0 & FATTR4_WORD0_ACL) { 2285 struct nfs4_ace *ace; 2286 2287 if (acl == NULL) { 2288 p = xdr_reserve_space(xdr, 4); 2289 if (!p) 2290 goto out_resource; 2291 2292 *p++ = cpu_to_be32(0); 2293 goto out_acl; 2294 } 2295 p = xdr_reserve_space(xdr, 4); 2296 if (!p) 2297 goto out_resource; 2298 *p++ = cpu_to_be32(acl->naces); 2299 2300 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) { 2301 p = xdr_reserve_space(xdr, 4*3); 2302 if (!p) 2303 goto out_resource; 2304 *p++ = cpu_to_be32(ace->type); 2305 *p++ = cpu_to_be32(ace->flag); 2306 *p++ = cpu_to_be32(ace->access_mask & 2307 NFS4_ACE_MASK_ALL); 2308 status = nfsd4_encode_aclname(xdr, rqstp, ace); 2309 if (status) 2310 goto out; 2311 } 2312 } 2313 out_acl: 2314 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) { 2315 p = xdr_reserve_space(xdr, 4); 2316 if (!p) 2317 goto out_resource; 2318 *p++ = cpu_to_be32(aclsupport ? 2319 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0); 2320 } 2321 if (bmval0 & FATTR4_WORD0_CANSETTIME) { 2322 p = xdr_reserve_space(xdr, 4); 2323 if (!p) 2324 goto out_resource; 2325 *p++ = cpu_to_be32(1); 2326 } 2327 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) { 2328 p = xdr_reserve_space(xdr, 4); 2329 if (!p) 2330 goto out_resource; 2331 *p++ = cpu_to_be32(0); 2332 } 2333 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) { 2334 p = xdr_reserve_space(xdr, 4); 2335 if (!p) 2336 goto out_resource; 2337 *p++ = cpu_to_be32(1); 2338 } 2339 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) { 2340 p = xdr_reserve_space(xdr, 4); 2341 if (!p) 2342 goto out_resource; 2343 *p++ = cpu_to_be32(1); 2344 } 2345 if (bmval0 & FATTR4_WORD0_FILEHANDLE) { 2346 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4); 2347 if (!p) 2348 goto out_resource; 2349 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, 2350 fhp->fh_handle.fh_size); 2351 } 2352 if (bmval0 & FATTR4_WORD0_FILEID) { 2353 p = xdr_reserve_space(xdr, 8); 2354 if (!p) 2355 goto out_resource; 2356 p = xdr_encode_hyper(p, stat.ino); 2357 } 2358 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) { 2359 p = xdr_reserve_space(xdr, 8); 2360 if (!p) 2361 goto out_resource; 2362 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 2363 } 2364 if (bmval0 & FATTR4_WORD0_FILES_FREE) { 2365 p = xdr_reserve_space(xdr, 8); 2366 if (!p) 2367 goto out_resource; 2368 p = xdr_encode_hyper(p, (u64) statfs.f_ffree); 2369 } 2370 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) { 2371 p = xdr_reserve_space(xdr, 8); 2372 if (!p) 2373 goto out_resource; 2374 p = xdr_encode_hyper(p, (u64) statfs.f_files); 2375 } 2376 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) { 2377 status = nfsd4_encode_fs_locations(xdr, rqstp, exp); 2378 if (status) 2379 goto out; 2380 } 2381 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) { 2382 p = xdr_reserve_space(xdr, 4); 2383 if (!p) 2384 goto out_resource; 2385 *p++ = cpu_to_be32(1); 2386 } 2387 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) { 2388 p = xdr_reserve_space(xdr, 8); 2389 if (!p) 2390 goto out_resource; 2391 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes); 2392 } 2393 if (bmval0 & FATTR4_WORD0_MAXLINK) { 2394 p = xdr_reserve_space(xdr, 4); 2395 if (!p) 2396 goto out_resource; 2397 *p++ = cpu_to_be32(255); 2398 } 2399 if (bmval0 & FATTR4_WORD0_MAXNAME) { 2400 p = xdr_reserve_space(xdr, 4); 2401 if (!p) 2402 goto out_resource; 2403 *p++ = cpu_to_be32(statfs.f_namelen); 2404 } 2405 if (bmval0 & FATTR4_WORD0_MAXREAD) { 2406 p = xdr_reserve_space(xdr, 8); 2407 if (!p) 2408 goto out_resource; 2409 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 2410 } 2411 if (bmval0 & FATTR4_WORD0_MAXWRITE) { 2412 p = xdr_reserve_space(xdr, 8); 2413 if (!p) 2414 goto out_resource; 2415 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp)); 2416 } 2417 if (bmval1 & FATTR4_WORD1_MODE) { 2418 p = xdr_reserve_space(xdr, 4); 2419 if (!p) 2420 goto out_resource; 2421 *p++ = cpu_to_be32(stat.mode & S_IALLUGO); 2422 } 2423 if (bmval1 & FATTR4_WORD1_NO_TRUNC) { 2424 p = xdr_reserve_space(xdr, 4); 2425 if (!p) 2426 goto out_resource; 2427 *p++ = cpu_to_be32(1); 2428 } 2429 if (bmval1 & FATTR4_WORD1_NUMLINKS) { 2430 p = xdr_reserve_space(xdr, 4); 2431 if (!p) 2432 goto out_resource; 2433 *p++ = cpu_to_be32(stat.nlink); 2434 } 2435 if (bmval1 & FATTR4_WORD1_OWNER) { 2436 status = nfsd4_encode_user(xdr, rqstp, stat.uid); 2437 if (status) 2438 goto out; 2439 } 2440 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) { 2441 status = nfsd4_encode_group(xdr, rqstp, stat.gid); 2442 if (status) 2443 goto out; 2444 } 2445 if (bmval1 & FATTR4_WORD1_RAWDEV) { 2446 p = xdr_reserve_space(xdr, 8); 2447 if (!p) 2448 goto out_resource; 2449 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev)); 2450 *p++ = cpu_to_be32((u32) MINOR(stat.rdev)); 2451 } 2452 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) { 2453 p = xdr_reserve_space(xdr, 8); 2454 if (!p) 2455 goto out_resource; 2456 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize; 2457 p = xdr_encode_hyper(p, dummy64); 2458 } 2459 if (bmval1 & FATTR4_WORD1_SPACE_FREE) { 2460 p = xdr_reserve_space(xdr, 8); 2461 if (!p) 2462 goto out_resource; 2463 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize; 2464 p = xdr_encode_hyper(p, dummy64); 2465 } 2466 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) { 2467 p = xdr_reserve_space(xdr, 8); 2468 if (!p) 2469 goto out_resource; 2470 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize; 2471 p = xdr_encode_hyper(p, dummy64); 2472 } 2473 if (bmval1 & FATTR4_WORD1_SPACE_USED) { 2474 p = xdr_reserve_space(xdr, 8); 2475 if (!p) 2476 goto out_resource; 2477 dummy64 = (u64)stat.blocks << 9; 2478 p = xdr_encode_hyper(p, dummy64); 2479 } 2480 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) { 2481 p = xdr_reserve_space(xdr, 12); 2482 if (!p) 2483 goto out_resource; 2484 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec); 2485 *p++ = cpu_to_be32(stat.atime.tv_nsec); 2486 } 2487 if (bmval1 & FATTR4_WORD1_TIME_DELTA) { 2488 p = xdr_reserve_space(xdr, 12); 2489 if (!p) 2490 goto out_resource; 2491 *p++ = cpu_to_be32(0); 2492 *p++ = cpu_to_be32(1); 2493 *p++ = cpu_to_be32(0); 2494 } 2495 if (bmval1 & FATTR4_WORD1_TIME_METADATA) { 2496 p = xdr_reserve_space(xdr, 12); 2497 if (!p) 2498 goto out_resource; 2499 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec); 2500 *p++ = cpu_to_be32(stat.ctime.tv_nsec); 2501 } 2502 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) { 2503 p = xdr_reserve_space(xdr, 12); 2504 if (!p) 2505 goto out_resource; 2506 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec); 2507 *p++ = cpu_to_be32(stat.mtime.tv_nsec); 2508 } 2509 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) { 2510 p = xdr_reserve_space(xdr, 8); 2511 if (!p) 2512 goto out_resource; 2513 /* 2514 * Get parent's attributes if not ignoring crossmount 2515 * and this is the root of a cross-mounted filesystem. 2516 */ 2517 if (ignore_crossmnt == 0 && 2518 dentry == exp->ex_path.mnt->mnt_root) 2519 get_parent_attributes(exp, &stat); 2520 p = xdr_encode_hyper(p, stat.ino); 2521 } 2522 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) { 2523 status = nfsd4_encode_security_label(xdr, rqstp, context, 2524 contextlen); 2525 if (status) 2526 goto out; 2527 } 2528 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) { 2529 p = xdr_reserve_space(xdr, 16); 2530 if (!p) 2531 goto out_resource; 2532 *p++ = cpu_to_be32(3); 2533 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0); 2534 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1); 2535 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2); 2536 } 2537 2538 attrlen = htonl(xdr->buf->len - attrlen_offset - 4); 2539 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4); 2540 status = nfs_ok; 2541 2542 out: 2543 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 2544 if (context) 2545 security_release_secctx(context, contextlen); 2546 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */ 2547 kfree(acl); 2548 if (tempfh) { 2549 fh_put(tempfh); 2550 kfree(tempfh); 2551 } 2552 if (status) 2553 xdr_truncate_encode(xdr, starting_len); 2554 return status; 2555 out_nfserr: 2556 status = nfserrno(err); 2557 goto out; 2558 out_resource: 2559 status = nfserr_resource; 2560 goto out; 2561 } 2562 2563 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr, 2564 struct xdr_buf *buf, __be32 *p, int bytes) 2565 { 2566 xdr->scratch.iov_len = 0; 2567 memset(buf, 0, sizeof(struct xdr_buf)); 2568 buf->head[0].iov_base = p; 2569 buf->head[0].iov_len = 0; 2570 buf->len = 0; 2571 xdr->buf = buf; 2572 xdr->iov = buf->head; 2573 xdr->p = p; 2574 xdr->end = (void *)p + bytes; 2575 buf->buflen = bytes; 2576 } 2577 2578 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words, 2579 struct svc_fh *fhp, struct svc_export *exp, 2580 struct dentry *dentry, u32 *bmval, 2581 struct svc_rqst *rqstp, int ignore_crossmnt) 2582 { 2583 struct xdr_buf dummy; 2584 struct xdr_stream xdr; 2585 __be32 ret; 2586 2587 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2); 2588 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp, 2589 ignore_crossmnt); 2590 *p = xdr.p; 2591 return ret; 2592 } 2593 2594 static inline int attributes_need_mount(u32 *bmval) 2595 { 2596 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME)) 2597 return 1; 2598 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) 2599 return 1; 2600 return 0; 2601 } 2602 2603 static __be32 2604 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd, 2605 const char *name, int namlen) 2606 { 2607 struct svc_export *exp = cd->rd_fhp->fh_export; 2608 struct dentry *dentry; 2609 __be32 nfserr; 2610 int ignore_crossmnt = 0; 2611 2612 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen); 2613 if (IS_ERR(dentry)) 2614 return nfserrno(PTR_ERR(dentry)); 2615 if (!dentry->d_inode) { 2616 /* 2617 * nfsd_buffered_readdir drops the i_mutex between 2618 * readdir and calling this callback, leaving a window 2619 * where this directory entry could have gone away. 2620 */ 2621 dput(dentry); 2622 return nfserr_noent; 2623 } 2624 2625 exp_get(exp); 2626 /* 2627 * In the case of a mountpoint, the client may be asking for 2628 * attributes that are only properties of the underlying filesystem 2629 * as opposed to the cross-mounted file system. In such a case, 2630 * we will not follow the cross mount and will fill the attribtutes 2631 * directly from the mountpoint dentry. 2632 */ 2633 if (nfsd_mountpoint(dentry, exp)) { 2634 int err; 2635 2636 if (!(exp->ex_flags & NFSEXP_V4ROOT) 2637 && !attributes_need_mount(cd->rd_bmval)) { 2638 ignore_crossmnt = 1; 2639 goto out_encode; 2640 } 2641 /* 2642 * Why the heck aren't we just using nfsd_lookup?? 2643 * Different "."/".." handling? Something else? 2644 * At least, add a comment here to explain.... 2645 */ 2646 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp); 2647 if (err) { 2648 nfserr = nfserrno(err); 2649 goto out_put; 2650 } 2651 nfserr = check_nfsd_access(exp, cd->rd_rqstp); 2652 if (nfserr) 2653 goto out_put; 2654 2655 } 2656 out_encode: 2657 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval, 2658 cd->rd_rqstp, ignore_crossmnt); 2659 out_put: 2660 dput(dentry); 2661 exp_put(exp); 2662 return nfserr; 2663 } 2664 2665 static __be32 * 2666 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr) 2667 { 2668 __be32 *p; 2669 2670 p = xdr_reserve_space(xdr, 20); 2671 if (!p) 2672 return NULL; 2673 *p++ = htonl(2); 2674 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */ 2675 *p++ = htonl(0); /* bmval1 */ 2676 2677 *p++ = htonl(4); /* attribute length */ 2678 *p++ = nfserr; /* no htonl */ 2679 return p; 2680 } 2681 2682 static int 2683 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen, 2684 loff_t offset, u64 ino, unsigned int d_type) 2685 { 2686 struct readdir_cd *ccd = ccdv; 2687 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common); 2688 struct xdr_stream *xdr = cd->xdr; 2689 int start_offset = xdr->buf->len; 2690 int cookie_offset; 2691 int entry_bytes; 2692 __be32 nfserr = nfserr_toosmall; 2693 __be64 wire_offset; 2694 __be32 *p; 2695 2696 /* In nfsv4, "." and ".." never make it onto the wire.. */ 2697 if (name && isdotent(name, namlen)) { 2698 cd->common.err = nfs_ok; 2699 return 0; 2700 } 2701 2702 if (cd->cookie_offset) { 2703 wire_offset = cpu_to_be64(offset); 2704 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset, 2705 &wire_offset, 8); 2706 } 2707 2708 p = xdr_reserve_space(xdr, 4); 2709 if (!p) 2710 goto fail; 2711 *p++ = xdr_one; /* mark entry present */ 2712 cookie_offset = xdr->buf->len; 2713 p = xdr_reserve_space(xdr, 3*4 + namlen); 2714 if (!p) 2715 goto fail; 2716 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */ 2717 p = xdr_encode_array(p, name, namlen); /* name length & name */ 2718 2719 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen); 2720 switch (nfserr) { 2721 case nfs_ok: 2722 break; 2723 case nfserr_resource: 2724 nfserr = nfserr_toosmall; 2725 goto fail; 2726 case nfserr_noent: 2727 xdr_truncate_encode(xdr, start_offset); 2728 goto skip_entry; 2729 default: 2730 /* 2731 * If the client requested the RDATTR_ERROR attribute, 2732 * we stuff the error code into this attribute 2733 * and continue. If this attribute was not requested, 2734 * then in accordance with the spec, we fail the 2735 * entire READDIR operation(!) 2736 */ 2737 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)) 2738 goto fail; 2739 p = nfsd4_encode_rdattr_error(xdr, nfserr); 2740 if (p == NULL) { 2741 nfserr = nfserr_toosmall; 2742 goto fail; 2743 } 2744 } 2745 nfserr = nfserr_toosmall; 2746 entry_bytes = xdr->buf->len - start_offset; 2747 if (entry_bytes > cd->rd_maxcount) 2748 goto fail; 2749 cd->rd_maxcount -= entry_bytes; 2750 if (!cd->rd_dircount) 2751 goto fail; 2752 cd->rd_dircount--; 2753 cd->cookie_offset = cookie_offset; 2754 skip_entry: 2755 cd->common.err = nfs_ok; 2756 return 0; 2757 fail: 2758 xdr_truncate_encode(xdr, start_offset); 2759 cd->common.err = nfserr; 2760 return -EINVAL; 2761 } 2762 2763 static __be32 2764 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid) 2765 { 2766 __be32 *p; 2767 2768 p = xdr_reserve_space(xdr, sizeof(stateid_t)); 2769 if (!p) 2770 return nfserr_resource; 2771 *p++ = cpu_to_be32(sid->si_generation); 2772 p = xdr_encode_opaque_fixed(p, &sid->si_opaque, 2773 sizeof(stateid_opaque_t)); 2774 return 0; 2775 } 2776 2777 static __be32 2778 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access) 2779 { 2780 struct xdr_stream *xdr = &resp->xdr; 2781 __be32 *p; 2782 2783 if (!nfserr) { 2784 p = xdr_reserve_space(xdr, 8); 2785 if (!p) 2786 return nfserr_resource; 2787 *p++ = cpu_to_be32(access->ac_supported); 2788 *p++ = cpu_to_be32(access->ac_resp_access); 2789 } 2790 return nfserr; 2791 } 2792 2793 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts) 2794 { 2795 struct xdr_stream *xdr = &resp->xdr; 2796 __be32 *p; 2797 2798 if (!nfserr) { 2799 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8); 2800 if (!p) 2801 return nfserr_resource; 2802 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data, 2803 NFS4_MAX_SESSIONID_LEN); 2804 *p++ = cpu_to_be32(bcts->dir); 2805 /* Sorry, we do not yet support RDMA over 4.1: */ 2806 *p++ = cpu_to_be32(0); 2807 } 2808 return nfserr; 2809 } 2810 2811 static __be32 2812 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close) 2813 { 2814 struct xdr_stream *xdr = &resp->xdr; 2815 2816 if (!nfserr) 2817 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid); 2818 2819 return nfserr; 2820 } 2821 2822 2823 static __be32 2824 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit) 2825 { 2826 struct xdr_stream *xdr = &resp->xdr; 2827 __be32 *p; 2828 2829 if (!nfserr) { 2830 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 2831 if (!p) 2832 return nfserr_resource; 2833 p = xdr_encode_opaque_fixed(p, commit->co_verf.data, 2834 NFS4_VERIFIER_SIZE); 2835 } 2836 return nfserr; 2837 } 2838 2839 static __be32 2840 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create) 2841 { 2842 struct xdr_stream *xdr = &resp->xdr; 2843 __be32 *p; 2844 2845 if (!nfserr) { 2846 p = xdr_reserve_space(xdr, 32); 2847 if (!p) 2848 return nfserr_resource; 2849 p = encode_cinfo(p, &create->cr_cinfo); 2850 *p++ = cpu_to_be32(2); 2851 *p++ = cpu_to_be32(create->cr_bmval[0]); 2852 *p++ = cpu_to_be32(create->cr_bmval[1]); 2853 } 2854 return nfserr; 2855 } 2856 2857 static __be32 2858 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr) 2859 { 2860 struct svc_fh *fhp = getattr->ga_fhp; 2861 struct xdr_stream *xdr = &resp->xdr; 2862 2863 if (nfserr) 2864 return nfserr; 2865 2866 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry, 2867 getattr->ga_bmval, 2868 resp->rqstp, 0); 2869 return nfserr; 2870 } 2871 2872 static __be32 2873 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp) 2874 { 2875 struct xdr_stream *xdr = &resp->xdr; 2876 struct svc_fh *fhp = *fhpp; 2877 unsigned int len; 2878 __be32 *p; 2879 2880 if (!nfserr) { 2881 len = fhp->fh_handle.fh_size; 2882 p = xdr_reserve_space(xdr, len + 4); 2883 if (!p) 2884 return nfserr_resource; 2885 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len); 2886 } 2887 return nfserr; 2888 } 2889 2890 /* 2891 * Including all fields other than the name, a LOCK4denied structure requires 2892 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes. 2893 */ 2894 static __be32 2895 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld) 2896 { 2897 struct xdr_netobj *conf = &ld->ld_owner; 2898 __be32 *p; 2899 2900 again: 2901 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len)); 2902 if (!p) { 2903 /* 2904 * Don't fail to return the result just because we can't 2905 * return the conflicting open: 2906 */ 2907 if (conf->len) { 2908 kfree(conf->data); 2909 conf->len = 0; 2910 conf->data = NULL; 2911 goto again; 2912 } 2913 return nfserr_resource; 2914 } 2915 p = xdr_encode_hyper(p, ld->ld_start); 2916 p = xdr_encode_hyper(p, ld->ld_length); 2917 *p++ = cpu_to_be32(ld->ld_type); 2918 if (conf->len) { 2919 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8); 2920 p = xdr_encode_opaque(p, conf->data, conf->len); 2921 kfree(conf->data); 2922 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */ 2923 p = xdr_encode_hyper(p, (u64)0); /* clientid */ 2924 *p++ = cpu_to_be32(0); /* length of owner name */ 2925 } 2926 return nfserr_denied; 2927 } 2928 2929 static __be32 2930 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock) 2931 { 2932 struct xdr_stream *xdr = &resp->xdr; 2933 2934 if (!nfserr) 2935 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid); 2936 else if (nfserr == nfserr_denied) 2937 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied); 2938 2939 return nfserr; 2940 } 2941 2942 static __be32 2943 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt) 2944 { 2945 struct xdr_stream *xdr = &resp->xdr; 2946 2947 if (nfserr == nfserr_denied) 2948 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied); 2949 return nfserr; 2950 } 2951 2952 static __be32 2953 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku) 2954 { 2955 struct xdr_stream *xdr = &resp->xdr; 2956 2957 if (!nfserr) 2958 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid); 2959 2960 return nfserr; 2961 } 2962 2963 2964 static __be32 2965 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link) 2966 { 2967 struct xdr_stream *xdr = &resp->xdr; 2968 __be32 *p; 2969 2970 if (!nfserr) { 2971 p = xdr_reserve_space(xdr, 20); 2972 if (!p) 2973 return nfserr_resource; 2974 p = encode_cinfo(p, &link->li_cinfo); 2975 } 2976 return nfserr; 2977 } 2978 2979 2980 static __be32 2981 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open) 2982 { 2983 struct xdr_stream *xdr = &resp->xdr; 2984 __be32 *p; 2985 2986 if (nfserr) 2987 goto out; 2988 2989 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid); 2990 if (nfserr) 2991 goto out; 2992 p = xdr_reserve_space(xdr, 40); 2993 if (!p) 2994 return nfserr_resource; 2995 p = encode_cinfo(p, &open->op_cinfo); 2996 *p++ = cpu_to_be32(open->op_rflags); 2997 *p++ = cpu_to_be32(2); 2998 *p++ = cpu_to_be32(open->op_bmval[0]); 2999 *p++ = cpu_to_be32(open->op_bmval[1]); 3000 *p++ = cpu_to_be32(open->op_delegate_type); 3001 3002 switch (open->op_delegate_type) { 3003 case NFS4_OPEN_DELEGATE_NONE: 3004 break; 3005 case NFS4_OPEN_DELEGATE_READ: 3006 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3007 if (nfserr) 3008 return nfserr; 3009 p = xdr_reserve_space(xdr, 20); 3010 if (!p) 3011 return nfserr_resource; 3012 *p++ = cpu_to_be32(open->op_recall); 3013 3014 /* 3015 * TODO: ACE's in delegations 3016 */ 3017 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3018 *p++ = cpu_to_be32(0); 3019 *p++ = cpu_to_be32(0); 3020 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3021 break; 3022 case NFS4_OPEN_DELEGATE_WRITE: 3023 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid); 3024 if (nfserr) 3025 return nfserr; 3026 p = xdr_reserve_space(xdr, 32); 3027 if (!p) 3028 return nfserr_resource; 3029 *p++ = cpu_to_be32(0); 3030 3031 /* 3032 * TODO: space_limit's in delegations 3033 */ 3034 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE); 3035 *p++ = cpu_to_be32(~(u32)0); 3036 *p++ = cpu_to_be32(~(u32)0); 3037 3038 /* 3039 * TODO: ACE's in delegations 3040 */ 3041 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE); 3042 *p++ = cpu_to_be32(0); 3043 *p++ = cpu_to_be32(0); 3044 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */ 3045 break; 3046 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */ 3047 switch (open->op_why_no_deleg) { 3048 case WND4_CONTENTION: 3049 case WND4_RESOURCE: 3050 p = xdr_reserve_space(xdr, 8); 3051 if (!p) 3052 return nfserr_resource; 3053 *p++ = cpu_to_be32(open->op_why_no_deleg); 3054 /* deleg signaling not supported yet: */ 3055 *p++ = cpu_to_be32(0); 3056 break; 3057 default: 3058 p = xdr_reserve_space(xdr, 4); 3059 if (!p) 3060 return nfserr_resource; 3061 *p++ = cpu_to_be32(open->op_why_no_deleg); 3062 } 3063 break; 3064 default: 3065 BUG(); 3066 } 3067 /* XXX save filehandle here */ 3068 out: 3069 return nfserr; 3070 } 3071 3072 static __be32 3073 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc) 3074 { 3075 struct xdr_stream *xdr = &resp->xdr; 3076 3077 if (!nfserr) 3078 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid); 3079 3080 return nfserr; 3081 } 3082 3083 static __be32 3084 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od) 3085 { 3086 struct xdr_stream *xdr = &resp->xdr; 3087 3088 if (!nfserr) 3089 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid); 3090 3091 return nfserr; 3092 } 3093 3094 static __be32 nfsd4_encode_splice_read( 3095 struct nfsd4_compoundres *resp, 3096 struct nfsd4_read *read, 3097 struct file *file, unsigned long maxcount) 3098 { 3099 struct xdr_stream *xdr = &resp->xdr; 3100 struct xdr_buf *buf = xdr->buf; 3101 u32 eof; 3102 int space_left; 3103 __be32 nfserr; 3104 __be32 *p = xdr->p - 2; 3105 3106 /* Make sure there will be room for padding if needed */ 3107 if (xdr->end - xdr->p < 1) 3108 return nfserr_resource; 3109 3110 nfserr = nfsd_splice_read(read->rd_rqstp, file, 3111 read->rd_offset, &maxcount); 3112 if (nfserr) { 3113 /* 3114 * nfsd_splice_actor may have already messed with the 3115 * page length; reset it so as not to confuse 3116 * xdr_truncate_encode: 3117 */ 3118 buf->page_len = 0; 3119 return nfserr; 3120 } 3121 3122 eof = (read->rd_offset + maxcount >= 3123 read->rd_fhp->fh_dentry->d_inode->i_size); 3124 3125 *(p++) = htonl(eof); 3126 *(p++) = htonl(maxcount); 3127 3128 buf->page_len = maxcount; 3129 buf->len += maxcount; 3130 xdr->page_ptr += (maxcount + PAGE_SIZE - 1) / PAGE_SIZE; 3131 3132 /* Use rest of head for padding and remaining ops: */ 3133 buf->tail[0].iov_base = xdr->p; 3134 buf->tail[0].iov_len = 0; 3135 xdr->iov = buf->tail; 3136 if (maxcount&3) { 3137 int pad = 4 - (maxcount&3); 3138 3139 *(xdr->p++) = 0; 3140 3141 buf->tail[0].iov_base += maxcount&3; 3142 buf->tail[0].iov_len = pad; 3143 buf->len += pad; 3144 } 3145 3146 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p, 3147 buf->buflen - buf->len); 3148 buf->buflen = buf->len + space_left; 3149 xdr->end = (__be32 *)((void *)xdr->end + space_left); 3150 3151 return 0; 3152 } 3153 3154 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, 3155 struct nfsd4_read *read, 3156 struct file *file, unsigned long maxcount) 3157 { 3158 struct xdr_stream *xdr = &resp->xdr; 3159 u32 eof; 3160 int v; 3161 int starting_len = xdr->buf->len - 8; 3162 long len; 3163 int thislen; 3164 __be32 nfserr; 3165 __be32 tmp; 3166 __be32 *p; 3167 u32 zzz = 0; 3168 int pad; 3169 3170 len = maxcount; 3171 v = 0; 3172 3173 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p)); 3174 p = xdr_reserve_space(xdr, (thislen+3)&~3); 3175 WARN_ON_ONCE(!p); 3176 resp->rqstp->rq_vec[v].iov_base = p; 3177 resp->rqstp->rq_vec[v].iov_len = thislen; 3178 v++; 3179 len -= thislen; 3180 3181 while (len) { 3182 thislen = min_t(long, len, PAGE_SIZE); 3183 p = xdr_reserve_space(xdr, (thislen+3)&~3); 3184 WARN_ON_ONCE(!p); 3185 resp->rqstp->rq_vec[v].iov_base = p; 3186 resp->rqstp->rq_vec[v].iov_len = thislen; 3187 v++; 3188 len -= thislen; 3189 } 3190 read->rd_vlen = v; 3191 3192 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec, 3193 read->rd_vlen, &maxcount); 3194 if (nfserr) 3195 return nfserr; 3196 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3)); 3197 3198 eof = (read->rd_offset + maxcount >= 3199 read->rd_fhp->fh_dentry->d_inode->i_size); 3200 3201 tmp = htonl(eof); 3202 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4); 3203 tmp = htonl(maxcount); 3204 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4); 3205 3206 pad = (maxcount&3) ? 4 - (maxcount&3) : 0; 3207 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount, 3208 &zzz, pad); 3209 return 0; 3210 3211 } 3212 3213 static __be32 3214 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 3215 struct nfsd4_read *read) 3216 { 3217 unsigned long maxcount; 3218 struct xdr_stream *xdr = &resp->xdr; 3219 struct file *file = read->rd_filp; 3220 int starting_len = xdr->buf->len; 3221 struct raparms *ra; 3222 __be32 *p; 3223 __be32 err; 3224 3225 if (nfserr) 3226 return nfserr; 3227 3228 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */ 3229 if (!p) { 3230 WARN_ON_ONCE(resp->rqstp->rq_splice_ok); 3231 return nfserr_resource; 3232 } 3233 if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) { 3234 WARN_ON_ONCE(1); 3235 return nfserr_resource; 3236 } 3237 xdr_commit_encode(xdr); 3238 3239 maxcount = svc_max_payload(resp->rqstp); 3240 maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len)); 3241 maxcount = min_t(unsigned long, maxcount, read->rd_length); 3242 3243 if (!read->rd_filp) { 3244 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp, 3245 &file, &ra); 3246 if (err) 3247 goto err_truncate; 3248 } 3249 3250 if (file->f_op->splice_read && resp->rqstp->rq_splice_ok) 3251 err = nfsd4_encode_splice_read(resp, read, file, maxcount); 3252 else 3253 err = nfsd4_encode_readv(resp, read, file, maxcount); 3254 3255 if (!read->rd_filp) 3256 nfsd_put_tmp_read_open(file, ra); 3257 3258 err_truncate: 3259 if (err) 3260 xdr_truncate_encode(xdr, starting_len); 3261 return err; 3262 } 3263 3264 static __be32 3265 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink) 3266 { 3267 int maxcount; 3268 __be32 wire_count; 3269 int zero = 0; 3270 struct xdr_stream *xdr = &resp->xdr; 3271 int length_offset = xdr->buf->len; 3272 __be32 *p; 3273 3274 if (nfserr) 3275 return nfserr; 3276 3277 p = xdr_reserve_space(xdr, 4); 3278 if (!p) 3279 return nfserr_resource; 3280 maxcount = PAGE_SIZE; 3281 3282 p = xdr_reserve_space(xdr, maxcount); 3283 if (!p) 3284 return nfserr_resource; 3285 /* 3286 * XXX: By default, the ->readlink() VFS op will truncate symlinks 3287 * if they would overflow the buffer. Is this kosher in NFSv4? If 3288 * not, one easy fix is: if ->readlink() precisely fills the buffer, 3289 * assume that truncation occurred, and return NFS4ERR_RESOURCE. 3290 */ 3291 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, 3292 (char *)p, &maxcount); 3293 if (nfserr == nfserr_isdir) 3294 nfserr = nfserr_inval; 3295 if (nfserr) { 3296 xdr_truncate_encode(xdr, length_offset); 3297 return nfserr; 3298 } 3299 3300 wire_count = htonl(maxcount); 3301 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4); 3302 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4)); 3303 if (maxcount & 3) 3304 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, 3305 &zero, 4 - (maxcount&3)); 3306 return 0; 3307 } 3308 3309 static __be32 3310 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir) 3311 { 3312 int maxcount; 3313 int bytes_left; 3314 loff_t offset; 3315 __be64 wire_offset; 3316 struct xdr_stream *xdr = &resp->xdr; 3317 int starting_len = xdr->buf->len; 3318 __be32 *p; 3319 3320 if (nfserr) 3321 return nfserr; 3322 3323 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE); 3324 if (!p) 3325 return nfserr_resource; 3326 3327 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */ 3328 *p++ = cpu_to_be32(0); 3329 *p++ = cpu_to_be32(0); 3330 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p) 3331 - (char *)resp->xdr.buf->head[0].iov_base; 3332 3333 /* 3334 * Number of bytes left for directory entries allowing for the 3335 * final 8 bytes of the readdir and a following failed op: 3336 */ 3337 bytes_left = xdr->buf->buflen - xdr->buf->len 3338 - COMPOUND_ERR_SLACK_SPACE - 8; 3339 if (bytes_left < 0) { 3340 nfserr = nfserr_resource; 3341 goto err_no_verf; 3342 } 3343 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX); 3344 /* 3345 * Note the rfc defines rd_maxcount as the size of the 3346 * READDIR4resok structure, which includes the verifier above 3347 * and the 8 bytes encoded at the end of this function: 3348 */ 3349 if (maxcount < 16) { 3350 nfserr = nfserr_toosmall; 3351 goto err_no_verf; 3352 } 3353 maxcount = min_t(int, maxcount-16, bytes_left); 3354 3355 readdir->xdr = xdr; 3356 readdir->rd_maxcount = maxcount; 3357 readdir->common.err = 0; 3358 readdir->cookie_offset = 0; 3359 3360 offset = readdir->rd_cookie; 3361 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, 3362 &offset, 3363 &readdir->common, nfsd4_encode_dirent); 3364 if (nfserr == nfs_ok && 3365 readdir->common.err == nfserr_toosmall && 3366 xdr->buf->len == starting_len + 8) { 3367 /* nothing encoded; which limit did we hit?: */ 3368 if (maxcount - 16 < bytes_left) 3369 /* It was the fault of rd_maxcount: */ 3370 nfserr = nfserr_toosmall; 3371 else 3372 /* We ran out of buffer space: */ 3373 nfserr = nfserr_resource; 3374 } 3375 if (nfserr) 3376 goto err_no_verf; 3377 3378 if (readdir->cookie_offset) { 3379 wire_offset = cpu_to_be64(offset); 3380 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, 3381 &wire_offset, 8); 3382 } 3383 3384 p = xdr_reserve_space(xdr, 8); 3385 if (!p) { 3386 WARN_ON_ONCE(1); 3387 goto err_no_verf; 3388 } 3389 *p++ = 0; /* no more entries */ 3390 *p++ = htonl(readdir->common.err == nfserr_eof); 3391 3392 return 0; 3393 err_no_verf: 3394 xdr_truncate_encode(xdr, starting_len); 3395 return nfserr; 3396 } 3397 3398 static __be32 3399 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove) 3400 { 3401 struct xdr_stream *xdr = &resp->xdr; 3402 __be32 *p; 3403 3404 if (!nfserr) { 3405 p = xdr_reserve_space(xdr, 20); 3406 if (!p) 3407 return nfserr_resource; 3408 p = encode_cinfo(p, &remove->rm_cinfo); 3409 } 3410 return nfserr; 3411 } 3412 3413 static __be32 3414 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename) 3415 { 3416 struct xdr_stream *xdr = &resp->xdr; 3417 __be32 *p; 3418 3419 if (!nfserr) { 3420 p = xdr_reserve_space(xdr, 40); 3421 if (!p) 3422 return nfserr_resource; 3423 p = encode_cinfo(p, &rename->rn_sinfo); 3424 p = encode_cinfo(p, &rename->rn_tinfo); 3425 } 3426 return nfserr; 3427 } 3428 3429 static __be32 3430 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, 3431 __be32 nfserr, struct svc_export *exp) 3432 { 3433 u32 i, nflavs, supported; 3434 struct exp_flavor_info *flavs; 3435 struct exp_flavor_info def_flavs[2]; 3436 __be32 *p, *flavorsp; 3437 static bool report = true; 3438 3439 if (nfserr) 3440 goto out; 3441 nfserr = nfserr_resource; 3442 if (exp->ex_nflavors) { 3443 flavs = exp->ex_flavors; 3444 nflavs = exp->ex_nflavors; 3445 } else { /* Handling of some defaults in absence of real secinfo: */ 3446 flavs = def_flavs; 3447 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) { 3448 nflavs = 2; 3449 flavs[0].pseudoflavor = RPC_AUTH_UNIX; 3450 flavs[1].pseudoflavor = RPC_AUTH_NULL; 3451 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) { 3452 nflavs = 1; 3453 flavs[0].pseudoflavor 3454 = svcauth_gss_flavor(exp->ex_client); 3455 } else { 3456 nflavs = 1; 3457 flavs[0].pseudoflavor 3458 = exp->ex_client->flavour->flavour; 3459 } 3460 } 3461 3462 supported = 0; 3463 p = xdr_reserve_space(xdr, 4); 3464 if (!p) 3465 goto out; 3466 flavorsp = p++; /* to be backfilled later */ 3467 3468 for (i = 0; i < nflavs; i++) { 3469 rpc_authflavor_t pf = flavs[i].pseudoflavor; 3470 struct rpcsec_gss_info info; 3471 3472 if (rpcauth_get_gssinfo(pf, &info) == 0) { 3473 supported++; 3474 p = xdr_reserve_space(xdr, 4 + 4 + 3475 XDR_LEN(info.oid.len) + 4 + 4); 3476 if (!p) 3477 goto out; 3478 *p++ = cpu_to_be32(RPC_AUTH_GSS); 3479 p = xdr_encode_opaque(p, info.oid.data, info.oid.len); 3480 *p++ = cpu_to_be32(info.qop); 3481 *p++ = cpu_to_be32(info.service); 3482 } else if (pf < RPC_AUTH_MAXFLAVOR) { 3483 supported++; 3484 p = xdr_reserve_space(xdr, 4); 3485 if (!p) 3486 goto out; 3487 *p++ = cpu_to_be32(pf); 3488 } else { 3489 if (report) 3490 pr_warn("NFS: SECINFO: security flavor %u " 3491 "is not supported\n", pf); 3492 } 3493 } 3494 3495 if (nflavs != supported) 3496 report = false; 3497 *flavorsp = htonl(supported); 3498 nfserr = 0; 3499 out: 3500 if (exp) 3501 exp_put(exp); 3502 return nfserr; 3503 } 3504 3505 static __be32 3506 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr, 3507 struct nfsd4_secinfo *secinfo) 3508 { 3509 struct xdr_stream *xdr = &resp->xdr; 3510 3511 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp); 3512 } 3513 3514 static __be32 3515 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr, 3516 struct nfsd4_secinfo_no_name *secinfo) 3517 { 3518 struct xdr_stream *xdr = &resp->xdr; 3519 3520 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp); 3521 } 3522 3523 /* 3524 * The SETATTR encode routine is special -- it always encodes a bitmap, 3525 * regardless of the error status. 3526 */ 3527 static __be32 3528 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr) 3529 { 3530 struct xdr_stream *xdr = &resp->xdr; 3531 __be32 *p; 3532 3533 p = xdr_reserve_space(xdr, 16); 3534 if (!p) 3535 return nfserr_resource; 3536 if (nfserr) { 3537 *p++ = cpu_to_be32(3); 3538 *p++ = cpu_to_be32(0); 3539 *p++ = cpu_to_be32(0); 3540 *p++ = cpu_to_be32(0); 3541 } 3542 else { 3543 *p++ = cpu_to_be32(3); 3544 *p++ = cpu_to_be32(setattr->sa_bmval[0]); 3545 *p++ = cpu_to_be32(setattr->sa_bmval[1]); 3546 *p++ = cpu_to_be32(setattr->sa_bmval[2]); 3547 } 3548 return nfserr; 3549 } 3550 3551 static __be32 3552 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd) 3553 { 3554 struct xdr_stream *xdr = &resp->xdr; 3555 __be32 *p; 3556 3557 if (!nfserr) { 3558 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE); 3559 if (!p) 3560 return nfserr_resource; 3561 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8); 3562 p = xdr_encode_opaque_fixed(p, &scd->se_confirm, 3563 NFS4_VERIFIER_SIZE); 3564 } 3565 else if (nfserr == nfserr_clid_inuse) { 3566 p = xdr_reserve_space(xdr, 8); 3567 if (!p) 3568 return nfserr_resource; 3569 *p++ = cpu_to_be32(0); 3570 *p++ = cpu_to_be32(0); 3571 } 3572 return nfserr; 3573 } 3574 3575 static __be32 3576 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write) 3577 { 3578 struct xdr_stream *xdr = &resp->xdr; 3579 __be32 *p; 3580 3581 if (!nfserr) { 3582 p = xdr_reserve_space(xdr, 16); 3583 if (!p) 3584 return nfserr_resource; 3585 *p++ = cpu_to_be32(write->wr_bytes_written); 3586 *p++ = cpu_to_be32(write->wr_how_written); 3587 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data, 3588 NFS4_VERIFIER_SIZE); 3589 } 3590 return nfserr; 3591 } 3592 3593 static const u32 nfs4_minimal_spo_must_enforce[2] = { 3594 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 3595 1 << (OP_EXCHANGE_ID - 32) | 3596 1 << (OP_CREATE_SESSION - 32) | 3597 1 << (OP_DESTROY_SESSION - 32) | 3598 1 << (OP_DESTROY_CLIENTID - 32) 3599 }; 3600 3601 static __be32 3602 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr, 3603 struct nfsd4_exchange_id *exid) 3604 { 3605 struct xdr_stream *xdr = &resp->xdr; 3606 __be32 *p; 3607 char *major_id; 3608 char *server_scope; 3609 int major_id_sz; 3610 int server_scope_sz; 3611 uint64_t minor_id = 0; 3612 3613 if (nfserr) 3614 return nfserr; 3615 3616 major_id = utsname()->nodename; 3617 major_id_sz = strlen(major_id); 3618 server_scope = utsname()->nodename; 3619 server_scope_sz = strlen(server_scope); 3620 3621 p = xdr_reserve_space(xdr, 3622 8 /* eir_clientid */ + 3623 4 /* eir_sequenceid */ + 3624 4 /* eir_flags */ + 3625 4 /* spr_how */); 3626 if (!p) 3627 return nfserr_resource; 3628 3629 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8); 3630 *p++ = cpu_to_be32(exid->seqid); 3631 *p++ = cpu_to_be32(exid->flags); 3632 3633 *p++ = cpu_to_be32(exid->spa_how); 3634 3635 switch (exid->spa_how) { 3636 case SP4_NONE: 3637 break; 3638 case SP4_MACH_CRED: 3639 /* spo_must_enforce, spo_must_allow */ 3640 p = xdr_reserve_space(xdr, 16); 3641 if (!p) 3642 return nfserr_resource; 3643 3644 /* spo_must_enforce bitmap: */ 3645 *p++ = cpu_to_be32(2); 3646 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]); 3647 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]); 3648 /* empty spo_must_allow bitmap: */ 3649 *p++ = cpu_to_be32(0); 3650 3651 break; 3652 default: 3653 WARN_ON_ONCE(1); 3654 } 3655 3656 p = xdr_reserve_space(xdr, 3657 8 /* so_minor_id */ + 3658 4 /* so_major_id.len */ + 3659 (XDR_QUADLEN(major_id_sz) * 4) + 3660 4 /* eir_server_scope.len */ + 3661 (XDR_QUADLEN(server_scope_sz) * 4) + 3662 4 /* eir_server_impl_id.count (0) */); 3663 if (!p) 3664 return nfserr_resource; 3665 3666 /* The server_owner struct */ 3667 p = xdr_encode_hyper(p, minor_id); /* Minor id */ 3668 /* major id */ 3669 p = xdr_encode_opaque(p, major_id, major_id_sz); 3670 3671 /* Server scope */ 3672 p = xdr_encode_opaque(p, server_scope, server_scope_sz); 3673 3674 /* Implementation id */ 3675 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */ 3676 return 0; 3677 } 3678 3679 static __be32 3680 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr, 3681 struct nfsd4_create_session *sess) 3682 { 3683 struct xdr_stream *xdr = &resp->xdr; 3684 __be32 *p; 3685 3686 if (nfserr) 3687 return nfserr; 3688 3689 p = xdr_reserve_space(xdr, 24); 3690 if (!p) 3691 return nfserr_resource; 3692 p = xdr_encode_opaque_fixed(p, sess->sessionid.data, 3693 NFS4_MAX_SESSIONID_LEN); 3694 *p++ = cpu_to_be32(sess->seqid); 3695 *p++ = cpu_to_be32(sess->flags); 3696 3697 p = xdr_reserve_space(xdr, 28); 3698 if (!p) 3699 return nfserr_resource; 3700 *p++ = cpu_to_be32(0); /* headerpadsz */ 3701 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz); 3702 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz); 3703 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached); 3704 *p++ = cpu_to_be32(sess->fore_channel.maxops); 3705 *p++ = cpu_to_be32(sess->fore_channel.maxreqs); 3706 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs); 3707 3708 if (sess->fore_channel.nr_rdma_attrs) { 3709 p = xdr_reserve_space(xdr, 4); 3710 if (!p) 3711 return nfserr_resource; 3712 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs); 3713 } 3714 3715 p = xdr_reserve_space(xdr, 28); 3716 if (!p) 3717 return nfserr_resource; 3718 *p++ = cpu_to_be32(0); /* headerpadsz */ 3719 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz); 3720 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz); 3721 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached); 3722 *p++ = cpu_to_be32(sess->back_channel.maxops); 3723 *p++ = cpu_to_be32(sess->back_channel.maxreqs); 3724 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs); 3725 3726 if (sess->back_channel.nr_rdma_attrs) { 3727 p = xdr_reserve_space(xdr, 4); 3728 if (!p) 3729 return nfserr_resource; 3730 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs); 3731 } 3732 return 0; 3733 } 3734 3735 static __be32 3736 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr, 3737 struct nfsd4_sequence *seq) 3738 { 3739 struct xdr_stream *xdr = &resp->xdr; 3740 __be32 *p; 3741 3742 if (nfserr) 3743 return nfserr; 3744 3745 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20); 3746 if (!p) 3747 return nfserr_resource; 3748 p = xdr_encode_opaque_fixed(p, seq->sessionid.data, 3749 NFS4_MAX_SESSIONID_LEN); 3750 *p++ = cpu_to_be32(seq->seqid); 3751 *p++ = cpu_to_be32(seq->slotid); 3752 /* Note slotid's are numbered from zero: */ 3753 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */ 3754 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */ 3755 *p++ = cpu_to_be32(seq->status_flags); 3756 3757 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */ 3758 return 0; 3759 } 3760 3761 static __be32 3762 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, 3763 struct nfsd4_test_stateid *test_stateid) 3764 { 3765 struct xdr_stream *xdr = &resp->xdr; 3766 struct nfsd4_test_stateid_id *stateid, *next; 3767 __be32 *p; 3768 3769 if (nfserr) 3770 return nfserr; 3771 3772 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids)); 3773 if (!p) 3774 return nfserr_resource; 3775 *p++ = htonl(test_stateid->ts_num_ids); 3776 3777 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) { 3778 *p++ = stateid->ts_id_status; 3779 } 3780 3781 return nfserr; 3782 } 3783 3784 static __be32 3785 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, 3786 struct nfsd4_seek *seek) 3787 { 3788 __be32 *p; 3789 3790 if (nfserr) 3791 return nfserr; 3792 3793 p = xdr_reserve_space(&resp->xdr, 4 + 8); 3794 *p++ = cpu_to_be32(seek->seek_eof); 3795 p = xdr_encode_hyper(p, seek->seek_pos); 3796 3797 return nfserr; 3798 } 3799 3800 static __be32 3801 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p) 3802 { 3803 return nfserr; 3804 } 3805 3806 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *); 3807 3808 /* 3809 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1 3810 * since we don't need to filter out obsolete ops as this is 3811 * done in the decoding phase. 3812 */ 3813 static nfsd4_enc nfsd4_enc_ops[] = { 3814 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access, 3815 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close, 3816 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit, 3817 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create, 3818 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop, 3819 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop, 3820 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr, 3821 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh, 3822 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link, 3823 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock, 3824 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt, 3825 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku, 3826 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop, 3827 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop, 3828 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop, 3829 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open, 3830 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop, 3831 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm, 3832 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade, 3833 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop, 3834 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop, 3835 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop, 3836 [OP_READ] = (nfsd4_enc)nfsd4_encode_read, 3837 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir, 3838 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink, 3839 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove, 3840 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename, 3841 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop, 3842 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop, 3843 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop, 3844 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo, 3845 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr, 3846 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid, 3847 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop, 3848 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop, 3849 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write, 3850 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop, 3851 3852 /* NFSv4.1 operations */ 3853 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop, 3854 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session, 3855 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id, 3856 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session, 3857 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop, 3858 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop, 3859 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 3860 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop, 3861 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop, 3862 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop, 3863 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop, 3864 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop, 3865 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name, 3866 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence, 3867 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop, 3868 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid, 3869 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop, 3870 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop, 3871 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop, 3872 3873 /* NFSv4.2 operations */ 3874 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 3875 [OP_COPY] = (nfsd4_enc)nfsd4_encode_noop, 3876 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop, 3877 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop, 3878 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop, 3879 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop, 3880 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop, 3881 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop, 3882 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop, 3883 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop, 3884 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek, 3885 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop, 3886 }; 3887 3888 /* 3889 * Calculate whether we still have space to encode repsize bytes. 3890 * There are two considerations: 3891 * - For NFS versions >=4.1, the size of the reply must stay within 3892 * session limits 3893 * - For all NFS versions, we must stay within limited preallocated 3894 * buffer space. 3895 * 3896 * This is called before the operation is processed, so can only provide 3897 * an upper estimate. For some nonidempotent operations (such as 3898 * getattr), it's not necessarily a problem if that estimate is wrong, 3899 * as we can fail it after processing without significant side effects. 3900 */ 3901 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize) 3902 { 3903 struct xdr_buf *buf = &resp->rqstp->rq_res; 3904 struct nfsd4_slot *slot = resp->cstate.slot; 3905 3906 if (buf->len + respsize <= buf->buflen) 3907 return nfs_ok; 3908 if (!nfsd4_has_session(&resp->cstate)) 3909 return nfserr_resource; 3910 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) { 3911 WARN_ON_ONCE(1); 3912 return nfserr_rep_too_big_to_cache; 3913 } 3914 return nfserr_rep_too_big; 3915 } 3916 3917 void 3918 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) 3919 { 3920 struct xdr_stream *xdr = &resp->xdr; 3921 struct nfs4_stateowner *so = resp->cstate.replay_owner; 3922 struct svc_rqst *rqstp = resp->rqstp; 3923 int post_err_offset; 3924 nfsd4_enc encoder; 3925 __be32 *p; 3926 3927 p = xdr_reserve_space(xdr, 8); 3928 if (!p) { 3929 WARN_ON_ONCE(1); 3930 return; 3931 } 3932 *p++ = cpu_to_be32(op->opnum); 3933 post_err_offset = xdr->buf->len; 3934 3935 if (op->opnum == OP_ILLEGAL) 3936 goto status; 3937 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) || 3938 !nfsd4_enc_ops[op->opnum]); 3939 encoder = nfsd4_enc_ops[op->opnum]; 3940 op->status = encoder(resp, op->status, &op->u); 3941 xdr_commit_encode(xdr); 3942 3943 /* nfsd4_check_resp_size guarantees enough room for error status */ 3944 if (!op->status) { 3945 int space_needed = 0; 3946 if (!nfsd4_last_compound_op(rqstp)) 3947 space_needed = COMPOUND_ERR_SLACK_SPACE; 3948 op->status = nfsd4_check_resp_size(resp, space_needed); 3949 } 3950 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) { 3951 struct nfsd4_slot *slot = resp->cstate.slot; 3952 3953 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) 3954 op->status = nfserr_rep_too_big_to_cache; 3955 else 3956 op->status = nfserr_rep_too_big; 3957 } 3958 if (op->status == nfserr_resource || 3959 op->status == nfserr_rep_too_big || 3960 op->status == nfserr_rep_too_big_to_cache) { 3961 /* 3962 * The operation may have already been encoded or 3963 * partially encoded. No op returns anything additional 3964 * in the case of one of these three errors, so we can 3965 * just truncate back to after the status. But it's a 3966 * bug if we had to do this on a non-idempotent op: 3967 */ 3968 warn_on_nonidempotent_op(op); 3969 xdr_truncate_encode(xdr, post_err_offset); 3970 } 3971 if (so) { 3972 int len = xdr->buf->len - post_err_offset; 3973 3974 so->so_replay.rp_status = op->status; 3975 so->so_replay.rp_buflen = len; 3976 read_bytes_from_xdr_buf(xdr->buf, post_err_offset, 3977 so->so_replay.rp_buf, len); 3978 } 3979 status: 3980 /* Note that op->status is already in network byte order: */ 3981 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4); 3982 } 3983 3984 /* 3985 * Encode the reply stored in the stateowner reply cache 3986 * 3987 * XDR note: do not encode rp->rp_buflen: the buffer contains the 3988 * previously sent already encoded operation. 3989 */ 3990 void 3991 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op) 3992 { 3993 __be32 *p; 3994 struct nfs4_replay *rp = op->replay; 3995 3996 BUG_ON(!rp); 3997 3998 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen); 3999 if (!p) { 4000 WARN_ON_ONCE(1); 4001 return; 4002 } 4003 *p++ = cpu_to_be32(op->opnum); 4004 *p++ = rp->rp_status; /* already xdr'ed */ 4005 4006 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen); 4007 } 4008 4009 int 4010 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) 4011 { 4012 return xdr_ressize_check(rqstp, p); 4013 } 4014 4015 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp) 4016 { 4017 struct svc_rqst *rqstp = rq; 4018 struct nfsd4_compoundargs *args = rqstp->rq_argp; 4019 4020 if (args->ops != args->iops) { 4021 kfree(args->ops); 4022 args->ops = args->iops; 4023 } 4024 kfree(args->tmpp); 4025 args->tmpp = NULL; 4026 while (args->to_free) { 4027 struct svcxdr_tmpbuf *tb = args->to_free; 4028 args->to_free = tb->next; 4029 kfree(tb); 4030 } 4031 return 1; 4032 } 4033 4034 int 4035 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args) 4036 { 4037 if (rqstp->rq_arg.head[0].iov_len % 4) { 4038 /* client is nuts */ 4039 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)", 4040 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid)); 4041 return 0; 4042 } 4043 args->p = p; 4044 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len; 4045 args->pagelist = rqstp->rq_arg.pages; 4046 args->pagelen = rqstp->rq_arg.page_len; 4047 args->tmpp = NULL; 4048 args->to_free = NULL; 4049 args->ops = args->iops; 4050 args->rqstp = rqstp; 4051 4052 return !nfsd4_decode_compound(args); 4053 } 4054 4055 int 4056 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp) 4057 { 4058 /* 4059 * All that remains is to write the tag and operation count... 4060 */ 4061 struct xdr_buf *buf = resp->xdr.buf; 4062 4063 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len + 4064 buf->tail[0].iov_len); 4065 4066 rqstp->rq_next_page = resp->xdr.page_ptr + 1; 4067 4068 p = resp->tagp; 4069 *p++ = htonl(resp->taglen); 4070 memcpy(p, resp->tag, resp->taglen); 4071 p += XDR_QUADLEN(resp->taglen); 4072 *p++ = htonl(resp->opcnt); 4073 4074 nfsd4_sequence_done(resp); 4075 return 1; 4076 } 4077 4078 /* 4079 * Local variables: 4080 * c-basic-offset: 8 4081 * End: 4082 */ 4083