1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/nfs/callback_xdr.c 4 * 5 * Copyright (C) 2004 Trond Myklebust 6 * 7 * NFSv4 callback encode/decode procedures 8 */ 9 #include <linux/kernel.h> 10 #include <linux/sunrpc/svc.h> 11 #include <linux/nfs4.h> 12 #include <linux/nfs_fs.h> 13 #include <linux/ratelimit.h> 14 #include <linux/printk.h> 15 #include <linux/slab.h> 16 #include <linux/sunrpc/bc_xprt.h> 17 #include "nfs4_fs.h" 18 #include "callback.h" 19 #include "internal.h" 20 #include "nfs4session.h" 21 22 #define CB_OP_TAGLEN_MAXSZ (512) 23 #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status 24 #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps 25 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 26 CB_OP_GETATTR_BITMAP_MAXSZ + \ 27 /* change, size, ctime, mtime */\ 28 (2 + 2 + 3 + 3) * 4) 29 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 30 31 #if defined(CONFIG_NFS_V4_1) 32 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 33 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 34 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 35 NFS4_MAX_SESSIONID_LEN + \ 36 (1 + 3) * 4) // seqid, 3 slotids 37 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 38 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 39 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 40 #endif /* CONFIG_NFS_V4_1 */ 41 #ifdef CONFIG_NFS_V4_2 42 #define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 43 #endif /* CONFIG_NFS_V4_2 */ 44 45 #define NFSDBG_FACILITY NFSDBG_CALLBACK 46 47 /* Internal error code */ 48 #define NFS4ERR_RESOURCE_HDR 11050 49 50 struct callback_op { 51 __be32 (*process_op)(void *, void *, struct cb_process_state *); 52 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *); 53 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *, 54 const void *); 55 long res_maxsize; 56 }; 57 58 static struct callback_op callback_ops[]; 59 60 static __be32 nfs4_callback_null(struct svc_rqst *rqstp) 61 { 62 return htonl(NFS4_OK); 63 } 64 65 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p) 66 { 67 return xdr_argsize_check(rqstp, p); 68 } 69 70 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p) 71 { 72 return xdr_ressize_check(rqstp, p); 73 } 74 75 static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes) 76 { 77 __be32 *p; 78 79 p = xdr_inline_decode(xdr, nbytes); 80 if (unlikely(p == NULL)) 81 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n"); 82 return p; 83 } 84 85 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, 86 const char **str, size_t maxlen) 87 { 88 ssize_t err; 89 90 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen); 91 if (err < 0) 92 return cpu_to_be32(NFS4ERR_RESOURCE); 93 *len = err; 94 return 0; 95 } 96 97 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 98 { 99 __be32 *p; 100 101 p = read_buf(xdr, 4); 102 if (unlikely(p == NULL)) 103 return htonl(NFS4ERR_RESOURCE); 104 fh->size = ntohl(*p); 105 if (fh->size > NFS4_FHSIZE) 106 return htonl(NFS4ERR_BADHANDLE); 107 p = read_buf(xdr, fh->size); 108 if (unlikely(p == NULL)) 109 return htonl(NFS4ERR_RESOURCE); 110 memcpy(&fh->data[0], p, fh->size); 111 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 112 return 0; 113 } 114 115 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 116 { 117 __be32 *p; 118 unsigned int attrlen; 119 120 p = read_buf(xdr, 4); 121 if (unlikely(p == NULL)) 122 return htonl(NFS4ERR_RESOURCE); 123 attrlen = ntohl(*p); 124 p = read_buf(xdr, attrlen << 2); 125 if (unlikely(p == NULL)) 126 return htonl(NFS4ERR_RESOURCE); 127 if (likely(attrlen > 0)) 128 bitmap[0] = ntohl(*p++); 129 if (attrlen > 1) 130 bitmap[1] = ntohl(*p); 131 return 0; 132 } 133 134 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 135 { 136 __be32 *p; 137 138 p = read_buf(xdr, NFS4_STATEID_SIZE); 139 if (unlikely(p == NULL)) 140 return htonl(NFS4ERR_RESOURCE); 141 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 142 return 0; 143 } 144 145 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 146 { 147 stateid->type = NFS4_DELEGATION_STATEID_TYPE; 148 return decode_stateid(xdr, stateid); 149 } 150 151 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 152 { 153 __be32 *p; 154 __be32 status; 155 156 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ); 157 if (unlikely(status != 0)) 158 return status; 159 p = read_buf(xdr, 12); 160 if (unlikely(p == NULL)) 161 return htonl(NFS4ERR_RESOURCE); 162 hdr->minorversion = ntohl(*p++); 163 /* Check for minor version support */ 164 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) { 165 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */ 166 } else { 167 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with " 168 "illegal minor version %u!\n", 169 __func__, hdr->minorversion); 170 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 171 } 172 hdr->nops = ntohl(*p); 173 return 0; 174 } 175 176 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 177 { 178 __be32 *p; 179 p = read_buf(xdr, 4); 180 if (unlikely(p == NULL)) 181 return htonl(NFS4ERR_RESOURCE_HDR); 182 *op = ntohl(*p); 183 return 0; 184 } 185 186 static __be32 decode_getattr_args(struct svc_rqst *rqstp, 187 struct xdr_stream *xdr, void *argp) 188 { 189 struct cb_getattrargs *args = argp; 190 __be32 status; 191 192 status = decode_fh(xdr, &args->fh); 193 if (unlikely(status != 0)) 194 return status; 195 return decode_bitmap(xdr, args->bitmap); 196 } 197 198 static __be32 decode_recall_args(struct svc_rqst *rqstp, 199 struct xdr_stream *xdr, void *argp) 200 { 201 struct cb_recallargs *args = argp; 202 __be32 *p; 203 __be32 status; 204 205 status = decode_delegation_stateid(xdr, &args->stateid); 206 if (unlikely(status != 0)) 207 return status; 208 p = read_buf(xdr, 4); 209 if (unlikely(p == NULL)) 210 return htonl(NFS4ERR_RESOURCE); 211 args->truncate = ntohl(*p); 212 return decode_fh(xdr, &args->fh); 213 } 214 215 #if defined(CONFIG_NFS_V4_1) 216 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 217 { 218 stateid->type = NFS4_LAYOUT_STATEID_TYPE; 219 return decode_stateid(xdr, stateid); 220 } 221 222 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 223 struct xdr_stream *xdr, void *argp) 224 { 225 struct cb_layoutrecallargs *args = argp; 226 __be32 *p; 227 __be32 status = 0; 228 uint32_t iomode; 229 230 p = read_buf(xdr, 4 * sizeof(uint32_t)); 231 if (unlikely(p == NULL)) 232 return htonl(NFS4ERR_BADXDR); 233 234 args->cbl_layout_type = ntohl(*p++); 235 /* Depite the spec's xdr, iomode really belongs in the FILE switch, 236 * as it is unusable and ignored with the other types. 237 */ 238 iomode = ntohl(*p++); 239 args->cbl_layoutchanged = ntohl(*p++); 240 args->cbl_recall_type = ntohl(*p++); 241 242 if (args->cbl_recall_type == RETURN_FILE) { 243 args->cbl_range.iomode = iomode; 244 status = decode_fh(xdr, &args->cbl_fh); 245 if (unlikely(status != 0)) 246 return status; 247 248 p = read_buf(xdr, 2 * sizeof(uint64_t)); 249 if (unlikely(p == NULL)) 250 return htonl(NFS4ERR_BADXDR); 251 p = xdr_decode_hyper(p, &args->cbl_range.offset); 252 p = xdr_decode_hyper(p, &args->cbl_range.length); 253 return decode_layout_stateid(xdr, &args->cbl_stateid); 254 } else if (args->cbl_recall_type == RETURN_FSID) { 255 p = read_buf(xdr, 2 * sizeof(uint64_t)); 256 if (unlikely(p == NULL)) 257 return htonl(NFS4ERR_BADXDR); 258 p = xdr_decode_hyper(p, &args->cbl_fsid.major); 259 p = xdr_decode_hyper(p, &args->cbl_fsid.minor); 260 } else if (args->cbl_recall_type != RETURN_ALL) 261 return htonl(NFS4ERR_BADXDR); 262 return 0; 263 } 264 265 static 266 __be32 decode_devicenotify_args(struct svc_rqst *rqstp, 267 struct xdr_stream *xdr, 268 void *argp) 269 { 270 struct cb_devicenotifyargs *args = argp; 271 __be32 *p; 272 __be32 status = 0; 273 u32 tmp; 274 int n, i; 275 args->ndevs = 0; 276 277 /* Num of device notifications */ 278 p = read_buf(xdr, sizeof(uint32_t)); 279 if (unlikely(p == NULL)) { 280 status = htonl(NFS4ERR_BADXDR); 281 goto out; 282 } 283 n = ntohl(*p++); 284 if (n <= 0) 285 goto out; 286 if (n > ULONG_MAX / sizeof(*args->devs)) { 287 status = htonl(NFS4ERR_BADXDR); 288 goto out; 289 } 290 291 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL); 292 if (!args->devs) { 293 status = htonl(NFS4ERR_DELAY); 294 goto out; 295 } 296 297 /* Decode each dev notification */ 298 for (i = 0; i < n; i++) { 299 struct cb_devicenotifyitem *dev = &args->devs[i]; 300 301 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE); 302 if (unlikely(p == NULL)) { 303 status = htonl(NFS4ERR_BADXDR); 304 goto err; 305 } 306 307 tmp = ntohl(*p++); /* bitmap size */ 308 if (tmp != 1) { 309 status = htonl(NFS4ERR_INVAL); 310 goto err; 311 } 312 dev->cbd_notify_type = ntohl(*p++); 313 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 314 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 315 status = htonl(NFS4ERR_INVAL); 316 goto err; 317 } 318 319 tmp = ntohl(*p++); /* opaque size */ 320 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 321 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 322 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 323 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 324 status = htonl(NFS4ERR_INVAL); 325 goto err; 326 } 327 dev->cbd_layout_type = ntohl(*p++); 328 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 329 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 330 331 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 332 p = read_buf(xdr, sizeof(uint32_t)); 333 if (unlikely(p == NULL)) { 334 status = htonl(NFS4ERR_BADXDR); 335 goto err; 336 } 337 dev->cbd_immediate = ntohl(*p++); 338 } else { 339 dev->cbd_immediate = 0; 340 } 341 342 args->ndevs++; 343 344 dprintk("%s: type %d layout 0x%x immediate %d\n", 345 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 346 dev->cbd_immediate); 347 } 348 out: 349 dprintk("%s: status %d ndevs %d\n", 350 __func__, ntohl(status), args->ndevs); 351 return status; 352 err: 353 kfree(args->devs); 354 goto out; 355 } 356 357 static __be32 decode_sessionid(struct xdr_stream *xdr, 358 struct nfs4_sessionid *sid) 359 { 360 __be32 *p; 361 362 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN); 363 if (unlikely(p == NULL)) 364 return htonl(NFS4ERR_RESOURCE); 365 366 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN); 367 return 0; 368 } 369 370 static __be32 decode_rc_list(struct xdr_stream *xdr, 371 struct referring_call_list *rc_list) 372 { 373 __be32 *p; 374 int i; 375 __be32 status; 376 377 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 378 if (status) 379 goto out; 380 381 status = htonl(NFS4ERR_RESOURCE); 382 p = read_buf(xdr, sizeof(uint32_t)); 383 if (unlikely(p == NULL)) 384 goto out; 385 386 rc_list->rcl_nrefcalls = ntohl(*p++); 387 if (rc_list->rcl_nrefcalls) { 388 p = read_buf(xdr, 389 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 390 if (unlikely(p == NULL)) 391 goto out; 392 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls, 393 sizeof(*rc_list->rcl_refcalls), 394 GFP_KERNEL); 395 if (unlikely(rc_list->rcl_refcalls == NULL)) 396 goto out; 397 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 398 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 399 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 400 } 401 } 402 status = 0; 403 404 out: 405 return status; 406 } 407 408 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 409 struct xdr_stream *xdr, 410 void *argp) 411 { 412 struct cb_sequenceargs *args = argp; 413 __be32 *p; 414 int i; 415 __be32 status; 416 417 status = decode_sessionid(xdr, &args->csa_sessionid); 418 if (status) 419 return status; 420 421 p = read_buf(xdr, 5 * sizeof(uint32_t)); 422 if (unlikely(p == NULL)) 423 return htonl(NFS4ERR_RESOURCE); 424 425 args->csa_addr = svc_addr(rqstp); 426 args->csa_sequenceid = ntohl(*p++); 427 args->csa_slotid = ntohl(*p++); 428 args->csa_highestslotid = ntohl(*p++); 429 args->csa_cachethis = ntohl(*p++); 430 args->csa_nrclists = ntohl(*p++); 431 args->csa_rclists = NULL; 432 if (args->csa_nrclists) { 433 args->csa_rclists = kmalloc_array(args->csa_nrclists, 434 sizeof(*args->csa_rclists), 435 GFP_KERNEL); 436 if (unlikely(args->csa_rclists == NULL)) 437 return htonl(NFS4ERR_RESOURCE); 438 439 for (i = 0; i < args->csa_nrclists; i++) { 440 status = decode_rc_list(xdr, &args->csa_rclists[i]); 441 if (status) { 442 args->csa_nrclists = i; 443 goto out_free; 444 } 445 } 446 } 447 return 0; 448 449 out_free: 450 for (i = 0; i < args->csa_nrclists; i++) 451 kfree(args->csa_rclists[i].rcl_refcalls); 452 kfree(args->csa_rclists); 453 return status; 454 } 455 456 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 457 struct xdr_stream *xdr, 458 void *argp) 459 { 460 struct cb_recallanyargs *args = argp; 461 uint32_t bitmap[2]; 462 __be32 *p, status; 463 464 p = read_buf(xdr, 4); 465 if (unlikely(p == NULL)) 466 return htonl(NFS4ERR_BADXDR); 467 args->craa_objs_to_keep = ntohl(*p++); 468 status = decode_bitmap(xdr, bitmap); 469 if (unlikely(status)) 470 return status; 471 args->craa_type_mask = bitmap[0]; 472 473 return 0; 474 } 475 476 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 477 struct xdr_stream *xdr, 478 void *argp) 479 { 480 struct cb_recallslotargs *args = argp; 481 __be32 *p; 482 483 p = read_buf(xdr, 4); 484 if (unlikely(p == NULL)) 485 return htonl(NFS4ERR_BADXDR); 486 args->crsa_target_highest_slotid = ntohl(*p++); 487 return 0; 488 } 489 490 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) 491 { 492 __be32 *p; 493 unsigned int len; 494 495 p = read_buf(xdr, 12); 496 if (unlikely(p == NULL)) 497 return htonl(NFS4ERR_BADXDR); 498 499 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); 500 len = be32_to_cpu(*p); 501 502 p = read_buf(xdr, len); 503 if (unlikely(p == NULL)) 504 return htonl(NFS4ERR_BADXDR); 505 506 /* Only try to decode if the length is right */ 507 if (len == 20) { 508 p += 2; /* skip "lock id:" */ 509 args->cbnl_owner.s_dev = be32_to_cpu(*p++); 510 xdr_decode_hyper(p, &args->cbnl_owner.id); 511 args->cbnl_valid = true; 512 } else { 513 args->cbnl_owner.s_dev = 0; 514 args->cbnl_owner.id = 0; 515 args->cbnl_valid = false; 516 } 517 return 0; 518 } 519 520 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, 521 struct xdr_stream *xdr, void *argp) 522 { 523 struct cb_notify_lock_args *args = argp; 524 __be32 status; 525 526 status = decode_fh(xdr, &args->cbnl_fh); 527 if (unlikely(status != 0)) 528 return status; 529 return decode_lockowner(xdr, args); 530 } 531 532 #endif /* CONFIG_NFS_V4_1 */ 533 #ifdef CONFIG_NFS_V4_2 534 static __be32 decode_write_response(struct xdr_stream *xdr, 535 struct cb_offloadargs *args) 536 { 537 __be32 *p; 538 539 /* skip the always zero field */ 540 p = read_buf(xdr, 4); 541 if (unlikely(!p)) 542 goto out; 543 p++; 544 545 /* decode count, stable_how, verifier */ 546 p = xdr_inline_decode(xdr, 8 + 4); 547 if (unlikely(!p)) 548 goto out; 549 p = xdr_decode_hyper(p, &args->wr_count); 550 args->wr_writeverf.committed = be32_to_cpup(p); 551 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE); 552 if (likely(p)) { 553 memcpy(&args->wr_writeverf.verifier.data[0], p, 554 NFS4_VERIFIER_SIZE); 555 return 0; 556 } 557 out: 558 return htonl(NFS4ERR_RESOURCE); 559 } 560 561 static __be32 decode_offload_args(struct svc_rqst *rqstp, 562 struct xdr_stream *xdr, 563 void *data) 564 { 565 struct cb_offloadargs *args = data; 566 __be32 *p; 567 __be32 status; 568 569 /* decode fh */ 570 status = decode_fh(xdr, &args->coa_fh); 571 if (unlikely(status != 0)) 572 return status; 573 574 /* decode stateid */ 575 status = decode_stateid(xdr, &args->coa_stateid); 576 if (unlikely(status != 0)) 577 return status; 578 579 /* decode status */ 580 p = read_buf(xdr, 4); 581 if (unlikely(!p)) 582 goto out; 583 args->error = ntohl(*p++); 584 if (!args->error) { 585 status = decode_write_response(xdr, args); 586 if (unlikely(status != 0)) 587 return status; 588 } else { 589 p = xdr_inline_decode(xdr, 8); 590 if (unlikely(!p)) 591 goto out; 592 p = xdr_decode_hyper(p, &args->wr_count); 593 } 594 return 0; 595 out: 596 return htonl(NFS4ERR_RESOURCE); 597 } 598 #endif /* CONFIG_NFS_V4_2 */ 599 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 600 { 601 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 602 return cpu_to_be32(NFS4ERR_RESOURCE); 603 return 0; 604 } 605 606 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz) 607 { 608 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0) 609 return cpu_to_be32(NFS4ERR_RESOURCE); 610 return 0; 611 } 612 613 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 614 { 615 __be32 *p; 616 617 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 618 return 0; 619 p = xdr_reserve_space(xdr, 8); 620 if (unlikely(!p)) 621 return htonl(NFS4ERR_RESOURCE); 622 p = xdr_encode_hyper(p, change); 623 return 0; 624 } 625 626 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 627 { 628 __be32 *p; 629 630 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 631 return 0; 632 p = xdr_reserve_space(xdr, 8); 633 if (unlikely(!p)) 634 return htonl(NFS4ERR_RESOURCE); 635 p = xdr_encode_hyper(p, size); 636 return 0; 637 } 638 639 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 640 { 641 __be32 *p; 642 643 p = xdr_reserve_space(xdr, 12); 644 if (unlikely(!p)) 645 return htonl(NFS4ERR_RESOURCE); 646 p = xdr_encode_hyper(p, time->tv_sec); 647 *p = htonl(time->tv_nsec); 648 return 0; 649 } 650 651 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 652 { 653 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 654 return 0; 655 return encode_attr_time(xdr,time); 656 } 657 658 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 659 { 660 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 661 return 0; 662 return encode_attr_time(xdr,time); 663 } 664 665 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 666 { 667 __be32 status; 668 669 hdr->status = xdr_reserve_space(xdr, 4); 670 if (unlikely(hdr->status == NULL)) 671 return htonl(NFS4ERR_RESOURCE); 672 status = encode_string(xdr, hdr->taglen, hdr->tag); 673 if (unlikely(status != 0)) 674 return status; 675 hdr->nops = xdr_reserve_space(xdr, 4); 676 if (unlikely(hdr->nops == NULL)) 677 return htonl(NFS4ERR_RESOURCE); 678 return 0; 679 } 680 681 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 682 { 683 __be32 *p; 684 685 p = xdr_reserve_space(xdr, 8); 686 if (unlikely(p == NULL)) 687 return htonl(NFS4ERR_RESOURCE_HDR); 688 *p++ = htonl(op); 689 *p = res; 690 return 0; 691 } 692 693 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, 694 const void *resp) 695 { 696 const struct cb_getattrres *res = resp; 697 __be32 *savep = NULL; 698 __be32 status = res->status; 699 700 if (unlikely(status != 0)) 701 goto out; 702 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap)); 703 if (unlikely(status != 0)) 704 goto out; 705 status = cpu_to_be32(NFS4ERR_RESOURCE); 706 savep = xdr_reserve_space(xdr, sizeof(*savep)); 707 if (unlikely(!savep)) 708 goto out; 709 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 710 if (unlikely(status != 0)) 711 goto out; 712 status = encode_attr_size(xdr, res->bitmap, res->size); 713 if (unlikely(status != 0)) 714 goto out; 715 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 716 if (unlikely(status != 0)) 717 goto out; 718 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 719 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 720 out: 721 return status; 722 } 723 724 #if defined(CONFIG_NFS_V4_1) 725 726 static __be32 encode_sessionid(struct xdr_stream *xdr, 727 const struct nfs4_sessionid *sid) 728 { 729 __be32 *p; 730 731 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 732 if (unlikely(p == NULL)) 733 return htonl(NFS4ERR_RESOURCE); 734 735 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 736 return 0; 737 } 738 739 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 740 struct xdr_stream *xdr, 741 const void *resp) 742 { 743 const struct cb_sequenceres *res = resp; 744 __be32 *p; 745 __be32 status = res->csr_status; 746 747 if (unlikely(status != 0)) 748 return status; 749 750 status = encode_sessionid(xdr, &res->csr_sessionid); 751 if (status) 752 return status; 753 754 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 755 if (unlikely(p == NULL)) 756 return htonl(NFS4ERR_RESOURCE); 757 758 *p++ = htonl(res->csr_sequenceid); 759 *p++ = htonl(res->csr_slotid); 760 *p++ = htonl(res->csr_highestslotid); 761 *p++ = htonl(res->csr_target_highestslotid); 762 return 0; 763 } 764 765 static __be32 766 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 767 { 768 if (op_nr == OP_CB_SEQUENCE) { 769 if (nop != 0) 770 return htonl(NFS4ERR_SEQUENCE_POS); 771 } else { 772 if (nop == 0) 773 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 774 } 775 776 switch (op_nr) { 777 case OP_CB_GETATTR: 778 case OP_CB_RECALL: 779 case OP_CB_SEQUENCE: 780 case OP_CB_RECALL_ANY: 781 case OP_CB_RECALL_SLOT: 782 case OP_CB_LAYOUTRECALL: 783 case OP_CB_NOTIFY_DEVICEID: 784 case OP_CB_NOTIFY_LOCK: 785 *op = &callback_ops[op_nr]; 786 break; 787 788 case OP_CB_NOTIFY: 789 case OP_CB_PUSH_DELEG: 790 case OP_CB_RECALLABLE_OBJ_AVAIL: 791 case OP_CB_WANTS_CANCELLED: 792 return htonl(NFS4ERR_NOTSUPP); 793 794 default: 795 return htonl(NFS4ERR_OP_ILLEGAL); 796 } 797 798 return htonl(NFS_OK); 799 } 800 801 static void nfs4_callback_free_slot(struct nfs4_session *session, 802 struct nfs4_slot *slot) 803 { 804 struct nfs4_slot_table *tbl = &session->bc_slot_table; 805 806 spin_lock(&tbl->slot_tbl_lock); 807 /* 808 * Let the state manager know callback processing done. 809 * A single slot, so highest used slotid is either 0 or -1 810 */ 811 nfs4_free_slot(tbl, slot); 812 spin_unlock(&tbl->slot_tbl_lock); 813 } 814 815 static void nfs4_cb_free_slot(struct cb_process_state *cps) 816 { 817 if (cps->slot) { 818 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 819 cps->slot = NULL; 820 } 821 } 822 823 #else /* CONFIG_NFS_V4_1 */ 824 825 static __be32 826 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 827 { 828 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 829 } 830 831 static void nfs4_cb_free_slot(struct cb_process_state *cps) 832 { 833 } 834 #endif /* CONFIG_NFS_V4_1 */ 835 836 #ifdef CONFIG_NFS_V4_2 837 static __be32 838 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 839 { 840 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 841 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 842 return status; 843 844 if (op_nr == OP_CB_OFFLOAD) { 845 *op = &callback_ops[op_nr]; 846 return htonl(NFS_OK); 847 } else 848 return htonl(NFS4ERR_NOTSUPP); 849 return htonl(NFS4ERR_OP_ILLEGAL); 850 } 851 #else /* CONFIG_NFS_V4_2 */ 852 static __be32 853 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 854 { 855 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 856 } 857 #endif /* CONFIG_NFS_V4_2 */ 858 859 static __be32 860 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 861 { 862 switch (op_nr) { 863 case OP_CB_GETATTR: 864 case OP_CB_RECALL: 865 *op = &callback_ops[op_nr]; 866 break; 867 default: 868 return htonl(NFS4ERR_OP_ILLEGAL); 869 } 870 871 return htonl(NFS_OK); 872 } 873 874 static __be32 process_op(int nop, struct svc_rqst *rqstp, 875 struct xdr_stream *xdr_in, void *argp, 876 struct xdr_stream *xdr_out, void *resp, 877 struct cb_process_state *cps) 878 { 879 struct callback_op *op = &callback_ops[0]; 880 unsigned int op_nr; 881 __be32 status; 882 long maxlen; 883 __be32 res; 884 885 status = decode_op_hdr(xdr_in, &op_nr); 886 if (unlikely(status)) 887 return status; 888 889 switch (cps->minorversion) { 890 case 0: 891 status = preprocess_nfs4_op(op_nr, &op); 892 break; 893 case 1: 894 status = preprocess_nfs41_op(nop, op_nr, &op); 895 break; 896 case 2: 897 status = preprocess_nfs42_op(nop, op_nr, &op); 898 break; 899 default: 900 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 901 } 902 903 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 904 op_nr = OP_CB_ILLEGAL; 905 if (status) 906 goto encode_hdr; 907 908 if (cps->drc_status) { 909 status = cps->drc_status; 910 goto encode_hdr; 911 } 912 913 maxlen = xdr_out->end - xdr_out->p; 914 if (maxlen > 0 && maxlen < PAGE_SIZE) { 915 status = op->decode_args(rqstp, xdr_in, argp); 916 if (likely(status == 0)) 917 status = op->process_op(argp, resp, cps); 918 } else 919 status = htonl(NFS4ERR_RESOURCE); 920 921 encode_hdr: 922 res = encode_op_hdr(xdr_out, op_nr, status); 923 if (unlikely(res)) 924 return res; 925 if (op->encode_res != NULL && status == 0) 926 status = op->encode_res(rqstp, xdr_out, resp); 927 return status; 928 } 929 930 /* 931 * Decode, process and encode a COMPOUND 932 */ 933 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp) 934 { 935 struct cb_compound_hdr_arg hdr_arg = { 0 }; 936 struct cb_compound_hdr_res hdr_res = { NULL }; 937 struct xdr_stream xdr_in, xdr_out; 938 __be32 *p, status; 939 struct cb_process_state cps = { 940 .drc_status = 0, 941 .clp = NULL, 942 .net = SVC_NET(rqstp), 943 }; 944 unsigned int nops = 0; 945 946 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 947 948 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 949 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 950 951 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 952 if (status == htonl(NFS4ERR_RESOURCE)) 953 return rpc_garbage_args; 954 955 if (hdr_arg.minorversion == 0) { 956 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 957 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) { 958 if (cps.clp) 959 nfs_put_client(cps.clp); 960 goto out_invalidcred; 961 } 962 } 963 964 cps.minorversion = hdr_arg.minorversion; 965 hdr_res.taglen = hdr_arg.taglen; 966 hdr_res.tag = hdr_arg.tag; 967 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) { 968 if (cps.clp) 969 nfs_put_client(cps.clp); 970 return rpc_system_err; 971 } 972 while (status == 0 && nops != hdr_arg.nops) { 973 status = process_op(nops, rqstp, &xdr_in, 974 rqstp->rq_argp, &xdr_out, rqstp->rq_resp, 975 &cps); 976 nops++; 977 } 978 979 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 980 * resource error in cb_compound status without returning op */ 981 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 982 status = htonl(NFS4ERR_RESOURCE); 983 nops--; 984 } 985 986 *hdr_res.status = status; 987 *hdr_res.nops = htonl(nops); 988 nfs4_cb_free_slot(&cps); 989 nfs_put_client(cps.clp); 990 return rpc_success; 991 992 out_invalidcred: 993 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 994 return rpc_autherr_badcred; 995 } 996 997 /* 998 * Define NFS4 callback COMPOUND ops. 999 */ 1000 static struct callback_op callback_ops[] = { 1001 [0] = { 1002 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 1003 }, 1004 [OP_CB_GETATTR] = { 1005 .process_op = nfs4_callback_getattr, 1006 .decode_args = decode_getattr_args, 1007 .encode_res = encode_getattr_res, 1008 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 1009 }, 1010 [OP_CB_RECALL] = { 1011 .process_op = nfs4_callback_recall, 1012 .decode_args = decode_recall_args, 1013 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 1014 }, 1015 #if defined(CONFIG_NFS_V4_1) 1016 [OP_CB_LAYOUTRECALL] = { 1017 .process_op = nfs4_callback_layoutrecall, 1018 .decode_args = decode_layoutrecall_args, 1019 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 1020 }, 1021 [OP_CB_NOTIFY_DEVICEID] = { 1022 .process_op = nfs4_callback_devicenotify, 1023 .decode_args = decode_devicenotify_args, 1024 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 1025 }, 1026 [OP_CB_SEQUENCE] = { 1027 .process_op = nfs4_callback_sequence, 1028 .decode_args = decode_cb_sequence_args, 1029 .encode_res = encode_cb_sequence_res, 1030 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 1031 }, 1032 [OP_CB_RECALL_ANY] = { 1033 .process_op = nfs4_callback_recallany, 1034 .decode_args = decode_recallany_args, 1035 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 1036 }, 1037 [OP_CB_RECALL_SLOT] = { 1038 .process_op = nfs4_callback_recallslot, 1039 .decode_args = decode_recallslot_args, 1040 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 1041 }, 1042 [OP_CB_NOTIFY_LOCK] = { 1043 .process_op = nfs4_callback_notify_lock, 1044 .decode_args = decode_notify_lock_args, 1045 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 1046 }, 1047 #endif /* CONFIG_NFS_V4_1 */ 1048 #ifdef CONFIG_NFS_V4_2 1049 [OP_CB_OFFLOAD] = { 1050 .process_op = nfs4_callback_offload, 1051 .decode_args = decode_offload_args, 1052 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ, 1053 }, 1054 #endif /* CONFIG_NFS_V4_2 */ 1055 }; 1056 1057 /* 1058 * Define NFS4 callback procedures 1059 */ 1060 static const struct svc_procedure nfs4_callback_procedures1[] = { 1061 [CB_NULL] = { 1062 .pc_func = nfs4_callback_null, 1063 .pc_decode = nfs4_decode_void, 1064 .pc_encode = nfs4_encode_void, 1065 .pc_xdrressize = 1, 1066 }, 1067 [CB_COMPOUND] = { 1068 .pc_func = nfs4_callback_compound, 1069 .pc_encode = nfs4_encode_void, 1070 .pc_argsize = 256, 1071 .pc_ressize = 256, 1072 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1073 } 1074 }; 1075 1076 static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]; 1077 const struct svc_version nfs4_callback_version1 = { 1078 .vs_vers = 1, 1079 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1080 .vs_proc = nfs4_callback_procedures1, 1081 .vs_count = nfs4_callback_count1, 1082 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1083 .vs_dispatch = NULL, 1084 .vs_hidden = true, 1085 .vs_need_cong_ctrl = true, 1086 }; 1087 1088 static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]; 1089 const struct svc_version nfs4_callback_version4 = { 1090 .vs_vers = 4, 1091 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1092 .vs_proc = nfs4_callback_procedures1, 1093 .vs_count = nfs4_callback_count4, 1094 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1095 .vs_dispatch = NULL, 1096 .vs_hidden = true, 1097 .vs_need_cong_ctrl = true, 1098 }; 1099