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 #include "nfs4trace.h" 22 23 #define CB_OP_TAGLEN_MAXSZ (512) 24 #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status 25 #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps 26 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 27 CB_OP_GETATTR_BITMAP_MAXSZ + \ 28 /* change, size, atime, ctime, 29 * mtime, deleg_atime, deleg_mtime */\ 30 (2 + 2 + 3 + 3 + 3 + 3 + 3) * 4) 31 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 32 33 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 34 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 35 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 36 NFS4_MAX_SESSIONID_LEN + \ 37 (1 + 3) * 4) // seqid, 3 slotids 38 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 39 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 40 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 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 /* 66 * svc_process_common() looks for an XDR encoder to know when 67 * not to drop a Reply. 68 */ 69 static bool nfs4_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr) 70 { 71 return true; 72 } 73 74 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, 75 const char **str, size_t maxlen) 76 { 77 ssize_t err; 78 79 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen); 80 if (err < 0) 81 return cpu_to_be32(NFS4ERR_RESOURCE); 82 *len = err; 83 return 0; 84 } 85 86 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 87 { 88 __be32 *p; 89 90 p = xdr_inline_decode(xdr, 4); 91 if (unlikely(p == NULL)) 92 return htonl(NFS4ERR_RESOURCE); 93 fh->size = ntohl(*p); 94 if (fh->size > NFS4_FHSIZE) 95 return htonl(NFS4ERR_BADHANDLE); 96 p = xdr_inline_decode(xdr, fh->size); 97 if (unlikely(p == NULL)) 98 return htonl(NFS4ERR_RESOURCE); 99 memcpy(&fh->data[0], p, fh->size); 100 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 101 return 0; 102 } 103 104 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 105 { 106 __be32 *p; 107 unsigned int attrlen; 108 109 p = xdr_inline_decode(xdr, 4); 110 if (unlikely(p == NULL)) 111 return htonl(NFS4ERR_RESOURCE); 112 attrlen = ntohl(*p); 113 p = xdr_inline_decode(xdr, attrlen << 2); 114 if (unlikely(p == NULL)) 115 return htonl(NFS4ERR_RESOURCE); 116 if (likely(attrlen > 0)) 117 bitmap[0] = ntohl(*p++); 118 if (attrlen > 1) 119 bitmap[1] = ntohl(*p++); 120 if (attrlen > 2) 121 bitmap[2] = ntohl(*p); 122 return 0; 123 } 124 125 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 126 { 127 __be32 *p; 128 129 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 130 if (unlikely(p == NULL)) 131 return htonl(NFS4ERR_RESOURCE); 132 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 133 return 0; 134 } 135 136 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 137 { 138 stateid->type = NFS4_DELEGATION_STATEID_TYPE; 139 return decode_stateid(xdr, stateid); 140 } 141 142 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 143 { 144 __be32 *p; 145 __be32 status; 146 147 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ); 148 if (unlikely(status != 0)) 149 return status; 150 p = xdr_inline_decode(xdr, 12); 151 if (unlikely(p == NULL)) 152 return htonl(NFS4ERR_RESOURCE); 153 hdr->minorversion = ntohl(*p++); 154 /* Check for minor version support */ 155 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) { 156 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */ 157 } else { 158 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with " 159 "illegal minor version %u!\n", 160 __func__, hdr->minorversion); 161 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 162 } 163 hdr->nops = ntohl(*p); 164 return 0; 165 } 166 167 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 168 { 169 __be32 *p; 170 p = xdr_inline_decode(xdr, 4); 171 if (unlikely(p == NULL)) 172 return htonl(NFS4ERR_RESOURCE_HDR); 173 *op = ntohl(*p); 174 return 0; 175 } 176 177 static __be32 decode_getattr_args(struct svc_rqst *rqstp, 178 struct xdr_stream *xdr, void *argp) 179 { 180 struct cb_getattrargs *args = argp; 181 __be32 status; 182 183 status = decode_fh(xdr, &args->fh); 184 if (unlikely(status != 0)) 185 return status; 186 return decode_bitmap(xdr, args->bitmap); 187 } 188 189 static __be32 decode_recall_args(struct svc_rqst *rqstp, 190 struct xdr_stream *xdr, void *argp) 191 { 192 struct cb_recallargs *args = argp; 193 __be32 *p; 194 __be32 status; 195 196 status = decode_delegation_stateid(xdr, &args->stateid); 197 if (unlikely(status != 0)) 198 return status; 199 p = xdr_inline_decode(xdr, 4); 200 if (unlikely(p == NULL)) 201 return htonl(NFS4ERR_RESOURCE); 202 args->truncate = ntohl(*p); 203 return decode_fh(xdr, &args->fh); 204 } 205 206 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 207 { 208 stateid->type = NFS4_LAYOUT_STATEID_TYPE; 209 return decode_stateid(xdr, stateid); 210 } 211 212 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 213 struct xdr_stream *xdr, void *argp) 214 { 215 struct cb_layoutrecallargs *args = argp; 216 __be32 *p; 217 __be32 status = 0; 218 uint32_t iomode; 219 220 p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t)); 221 if (unlikely(p == NULL)) 222 return htonl(NFS4ERR_BADXDR); 223 224 args->cbl_layout_type = ntohl(*p++); 225 /* Depite the spec's xdr, iomode really belongs in the FILE switch, 226 * as it is unusable and ignored with the other types. 227 */ 228 iomode = ntohl(*p++); 229 args->cbl_layoutchanged = ntohl(*p++); 230 args->cbl_recall_type = ntohl(*p++); 231 232 if (args->cbl_recall_type == RETURN_FILE) { 233 args->cbl_range.iomode = iomode; 234 status = decode_fh(xdr, &args->cbl_fh); 235 if (unlikely(status != 0)) 236 return status; 237 238 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t)); 239 if (unlikely(p == NULL)) 240 return htonl(NFS4ERR_BADXDR); 241 p = xdr_decode_hyper(p, &args->cbl_range.offset); 242 p = xdr_decode_hyper(p, &args->cbl_range.length); 243 return decode_layout_stateid(xdr, &args->cbl_stateid); 244 } else if (args->cbl_recall_type == RETURN_FSID) { 245 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t)); 246 if (unlikely(p == NULL)) 247 return htonl(NFS4ERR_BADXDR); 248 p = xdr_decode_hyper(p, &args->cbl_fsid.major); 249 p = xdr_decode_hyper(p, &args->cbl_fsid.minor); 250 } else if (args->cbl_recall_type != RETURN_ALL) 251 return htonl(NFS4ERR_BADXDR); 252 return 0; 253 } 254 255 static 256 __be32 decode_devicenotify_args(struct svc_rqst *rqstp, 257 struct xdr_stream *xdr, 258 void *argp) 259 { 260 struct cb_devicenotifyargs *args = argp; 261 uint32_t tmp, n, i; 262 __be32 *p; 263 __be32 status = 0; 264 265 /* Num of device notifications */ 266 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 267 if (unlikely(p == NULL)) { 268 status = htonl(NFS4ERR_BADXDR); 269 goto out; 270 } 271 n = ntohl(*p++); 272 if (n == 0) 273 goto out; 274 275 args->devs = kmalloc_objs(*args->devs, n); 276 if (!args->devs) { 277 status = htonl(NFS4ERR_DELAY); 278 goto out; 279 } 280 281 /* Decode each dev notification */ 282 for (i = 0; i < n; i++) { 283 struct cb_devicenotifyitem *dev = &args->devs[i]; 284 285 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) + 286 NFS4_DEVICEID4_SIZE); 287 if (unlikely(p == NULL)) { 288 status = htonl(NFS4ERR_BADXDR); 289 goto err; 290 } 291 292 tmp = ntohl(*p++); /* bitmap size */ 293 if (tmp != 1) { 294 status = htonl(NFS4ERR_INVAL); 295 goto err; 296 } 297 dev->cbd_notify_type = ntohl(*p++); 298 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 299 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 300 status = htonl(NFS4ERR_INVAL); 301 goto err; 302 } 303 304 tmp = ntohl(*p++); /* opaque size */ 305 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 306 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 307 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 308 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 309 status = htonl(NFS4ERR_INVAL); 310 goto err; 311 } 312 dev->cbd_layout_type = ntohl(*p++); 313 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 314 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 315 316 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 317 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 318 if (unlikely(p == NULL)) { 319 status = htonl(NFS4ERR_BADXDR); 320 goto err; 321 } 322 dev->cbd_immediate = ntohl(*p++); 323 } else { 324 dev->cbd_immediate = 0; 325 } 326 327 dprintk("%s: type %d layout 0x%x immediate %d\n", 328 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 329 dev->cbd_immediate); 330 } 331 args->ndevs = n; 332 dprintk("%s: ndevs %d\n", __func__, args->ndevs); 333 return 0; 334 err: 335 kfree(args->devs); 336 out: 337 args->devs = NULL; 338 args->ndevs = 0; 339 dprintk("%s: status %d ndevs %d\n", 340 __func__, ntohl(status), args->ndevs); 341 return status; 342 } 343 344 static __be32 decode_sessionid(struct xdr_stream *xdr, 345 struct nfs4_sessionid *sid) 346 { 347 __be32 *p; 348 349 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN); 350 if (unlikely(p == NULL)) 351 return htonl(NFS4ERR_RESOURCE); 352 353 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN); 354 return 0; 355 } 356 357 static __be32 decode_rc_list(struct xdr_stream *xdr, 358 struct referring_call_list *rc_list) 359 { 360 __be32 *p; 361 int i; 362 __be32 status; 363 364 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 365 if (status) 366 goto out; 367 368 status = htonl(NFS4ERR_RESOURCE); 369 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 370 if (unlikely(p == NULL)) 371 goto out; 372 373 rc_list->rcl_nrefcalls = ntohl(*p++); 374 if (rc_list->rcl_nrefcalls) { 375 if (unlikely(rc_list->rcl_nrefcalls > xdr->buf->len)) 376 goto out; 377 p = xdr_inline_decode(xdr, 378 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 379 if (unlikely(p == NULL)) 380 goto out; 381 rc_list->rcl_refcalls = kmalloc_objs(*rc_list->rcl_refcalls, 382 rc_list->rcl_nrefcalls); 383 if (unlikely(rc_list->rcl_refcalls == NULL)) 384 goto out; 385 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 386 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 387 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 388 } 389 } 390 status = 0; 391 392 out: 393 return status; 394 } 395 396 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 397 struct xdr_stream *xdr, 398 void *argp) 399 { 400 struct cb_sequenceargs *args = argp; 401 __be32 *p; 402 int i; 403 __be32 status; 404 405 status = decode_sessionid(xdr, &args->csa_sessionid); 406 if (status) 407 return status; 408 409 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t)); 410 if (unlikely(p == NULL)) 411 return htonl(NFS4ERR_RESOURCE); 412 413 args->csa_addr = svc_addr(rqstp); 414 args->csa_sequenceid = ntohl(*p++); 415 args->csa_slotid = ntohl(*p++); 416 args->csa_highestslotid = ntohl(*p++); 417 args->csa_cachethis = ntohl(*p++); 418 args->csa_nrclists = ntohl(*p++); 419 args->csa_rclists = NULL; 420 if (args->csa_nrclists) { 421 args->csa_rclists = kmalloc_objs(*args->csa_rclists, 422 args->csa_nrclists); 423 if (unlikely(args->csa_rclists == NULL)) 424 return htonl(NFS4ERR_RESOURCE); 425 426 for (i = 0; i < args->csa_nrclists; i++) { 427 status = decode_rc_list(xdr, &args->csa_rclists[i]); 428 if (status) { 429 args->csa_nrclists = i; 430 goto out_free; 431 } 432 } 433 } 434 return 0; 435 436 out_free: 437 for (i = 0; i < args->csa_nrclists; i++) 438 kfree(args->csa_rclists[i].rcl_refcalls); 439 kfree(args->csa_rclists); 440 return status; 441 } 442 443 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 444 struct xdr_stream *xdr, 445 void *argp) 446 { 447 struct cb_recallanyargs *args = argp; 448 uint32_t bitmap[3]; 449 __be32 *p, status; 450 451 p = xdr_inline_decode(xdr, 4); 452 if (unlikely(p == NULL)) 453 return htonl(NFS4ERR_BADXDR); 454 args->craa_objs_to_keep = ntohl(*p++); 455 status = decode_bitmap(xdr, bitmap); 456 if (unlikely(status)) 457 return status; 458 args->craa_type_mask = bitmap[0]; 459 460 return 0; 461 } 462 463 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 464 struct xdr_stream *xdr, 465 void *argp) 466 { 467 struct cb_recallslotargs *args = argp; 468 __be32 *p; 469 470 p = xdr_inline_decode(xdr, 4); 471 if (unlikely(p == NULL)) 472 return htonl(NFS4ERR_BADXDR); 473 args->crsa_target_highest_slotid = ntohl(*p++); 474 return 0; 475 } 476 477 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) 478 { 479 __be32 *p; 480 unsigned int len; 481 482 p = xdr_inline_decode(xdr, 12); 483 if (unlikely(p == NULL)) 484 return htonl(NFS4ERR_BADXDR); 485 486 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); 487 len = be32_to_cpu(*p); 488 489 p = xdr_inline_decode(xdr, len); 490 if (unlikely(p == NULL)) 491 return htonl(NFS4ERR_BADXDR); 492 493 /* Only try to decode if the length is right */ 494 if (len == 20) { 495 p += 2; /* skip "lock id:" */ 496 args->cbnl_owner.s_dev = be32_to_cpu(*p++); 497 xdr_decode_hyper(p, &args->cbnl_owner.id); 498 args->cbnl_valid = true; 499 } else { 500 args->cbnl_owner.s_dev = 0; 501 args->cbnl_owner.id = 0; 502 args->cbnl_valid = false; 503 } 504 return 0; 505 } 506 507 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, 508 struct xdr_stream *xdr, void *argp) 509 { 510 struct cb_notify_lock_args *args = argp; 511 __be32 status; 512 513 status = decode_fh(xdr, &args->cbnl_fh); 514 if (unlikely(status != 0)) 515 return status; 516 return decode_lockowner(xdr, args); 517 } 518 519 #ifdef CONFIG_NFS_V4_2 520 static __be32 decode_write_response(struct xdr_stream *xdr, 521 struct cb_offloadargs *args) 522 { 523 __be32 *p; 524 525 /* skip the always zero field */ 526 p = xdr_inline_decode(xdr, 4); 527 if (unlikely(!p)) 528 goto out; 529 p++; 530 531 /* decode count, stable_how, verifier */ 532 p = xdr_inline_decode(xdr, 8 + 4); 533 if (unlikely(!p)) 534 goto out; 535 p = xdr_decode_hyper(p, &args->wr_count); 536 args->wr_writeverf.committed = be32_to_cpup(p); 537 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE); 538 if (likely(p)) { 539 memcpy(&args->wr_writeverf.verifier.data[0], p, 540 NFS4_VERIFIER_SIZE); 541 return 0; 542 } 543 out: 544 return htonl(NFS4ERR_RESOURCE); 545 } 546 547 static __be32 decode_offload_args(struct svc_rqst *rqstp, 548 struct xdr_stream *xdr, 549 void *data) 550 { 551 struct cb_offloadargs *args = data; 552 __be32 *p; 553 __be32 status; 554 555 /* decode fh */ 556 status = decode_fh(xdr, &args->coa_fh); 557 if (unlikely(status != 0)) 558 return status; 559 560 /* decode stateid */ 561 status = decode_stateid(xdr, &args->coa_stateid); 562 if (unlikely(status != 0)) 563 return status; 564 565 /* decode status */ 566 p = xdr_inline_decode(xdr, 4); 567 if (unlikely(!p)) 568 goto out; 569 args->error = ntohl(*p++); 570 if (!args->error) { 571 status = decode_write_response(xdr, args); 572 if (unlikely(status != 0)) 573 return status; 574 } else { 575 p = xdr_inline_decode(xdr, 8); 576 if (unlikely(!p)) 577 goto out; 578 p = xdr_decode_hyper(p, &args->wr_count); 579 } 580 return 0; 581 out: 582 return htonl(NFS4ERR_RESOURCE); 583 } 584 #endif /* CONFIG_NFS_V4_2 */ 585 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 586 { 587 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 588 return cpu_to_be32(NFS4ERR_RESOURCE); 589 return 0; 590 } 591 592 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz) 593 { 594 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0) 595 return cpu_to_be32(NFS4ERR_RESOURCE); 596 return 0; 597 } 598 599 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 600 { 601 __be32 *p; 602 603 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 604 return 0; 605 p = xdr_reserve_space(xdr, 8); 606 if (unlikely(!p)) 607 return htonl(NFS4ERR_RESOURCE); 608 p = xdr_encode_hyper(p, change); 609 return 0; 610 } 611 612 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 613 { 614 __be32 *p; 615 616 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 617 return 0; 618 p = xdr_reserve_space(xdr, 8); 619 if (unlikely(!p)) 620 return htonl(NFS4ERR_RESOURCE); 621 p = xdr_encode_hyper(p, size); 622 return 0; 623 } 624 625 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time) 626 { 627 __be32 *p; 628 629 p = xdr_reserve_space(xdr, 12); 630 if (unlikely(!p)) 631 return htonl(NFS4ERR_RESOURCE); 632 p = xdr_encode_hyper(p, time->tv_sec); 633 *p = htonl(time->tv_nsec); 634 return 0; 635 } 636 637 static __be32 encode_attr_atime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 638 { 639 if (!(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) 640 return 0; 641 return encode_attr_time(xdr,time); 642 } 643 644 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 645 { 646 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 647 return 0; 648 return encode_attr_time(xdr,time); 649 } 650 651 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 652 { 653 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 654 return 0; 655 return encode_attr_time(xdr,time); 656 } 657 658 static __be32 encode_attr_delegatime(struct xdr_stream *xdr, 659 const uint32_t *bitmap, 660 const struct timespec64 *time) 661 { 662 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_ACCESS)) 663 return 0; 664 return encode_attr_time(xdr,time); 665 } 666 667 static __be32 encode_attr_delegmtime(struct xdr_stream *xdr, 668 const uint32_t *bitmap, 669 const struct timespec64 *time) 670 { 671 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_MODIFY)) 672 return 0; 673 return encode_attr_time(xdr,time); 674 } 675 676 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 677 { 678 __be32 status; 679 680 hdr->status = xdr_reserve_space(xdr, 4); 681 if (unlikely(hdr->status == NULL)) 682 return htonl(NFS4ERR_RESOURCE); 683 status = encode_string(xdr, hdr->taglen, hdr->tag); 684 if (unlikely(status != 0)) 685 return status; 686 hdr->nops = xdr_reserve_space(xdr, 4); 687 if (unlikely(hdr->nops == NULL)) 688 return htonl(NFS4ERR_RESOURCE); 689 return 0; 690 } 691 692 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 693 { 694 __be32 *p; 695 696 p = xdr_reserve_space(xdr, 8); 697 if (unlikely(p == NULL)) 698 return htonl(NFS4ERR_RESOURCE_HDR); 699 *p++ = htonl(op); 700 *p = res; 701 return 0; 702 } 703 704 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, 705 const void *resp) 706 { 707 const struct cb_getattrres *res = resp; 708 __be32 *savep = NULL; 709 __be32 status = res->status; 710 711 if (unlikely(status != 0)) 712 goto out; 713 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap)); 714 if (unlikely(status != 0)) 715 goto out; 716 status = cpu_to_be32(NFS4ERR_RESOURCE); 717 savep = xdr_reserve_space(xdr, sizeof(*savep)); 718 if (unlikely(!savep)) 719 goto out; 720 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 721 if (unlikely(status != 0)) 722 goto out; 723 status = encode_attr_size(xdr, res->bitmap, res->size); 724 if (unlikely(status != 0)) 725 goto out; 726 status = encode_attr_atime(xdr, res->bitmap, &res->atime); 727 if (unlikely(status != 0)) 728 goto out; 729 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 730 if (unlikely(status != 0)) 731 goto out; 732 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 733 if (unlikely(status != 0)) 734 goto out; 735 status = encode_attr_delegatime(xdr, res->bitmap, &res->atime); 736 if (unlikely(status != 0)) 737 goto out; 738 status = encode_attr_delegmtime(xdr, res->bitmap, &res->mtime); 739 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 740 out: 741 return status; 742 } 743 744 static __be32 encode_sessionid(struct xdr_stream *xdr, 745 const struct nfs4_sessionid *sid) 746 { 747 __be32 *p; 748 749 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 750 if (unlikely(p == NULL)) 751 return htonl(NFS4ERR_RESOURCE); 752 753 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 754 return 0; 755 } 756 757 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 758 struct xdr_stream *xdr, 759 const void *resp) 760 { 761 const struct cb_sequenceres *res = resp; 762 __be32 *p; 763 __be32 status = res->csr_status; 764 765 if (unlikely(status != 0)) 766 return status; 767 768 status = encode_sessionid(xdr, &res->csr_sessionid); 769 if (status) 770 return status; 771 772 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 773 if (unlikely(p == NULL)) 774 return htonl(NFS4ERR_RESOURCE); 775 776 *p++ = htonl(res->csr_sequenceid); 777 *p++ = htonl(res->csr_slotid); 778 *p++ = htonl(res->csr_highestslotid); 779 *p++ = htonl(res->csr_target_highestslotid); 780 return 0; 781 } 782 783 static __be32 784 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 785 { 786 if (op_nr == OP_CB_SEQUENCE) { 787 if (nop != 0) 788 return htonl(NFS4ERR_SEQUENCE_POS); 789 } else { 790 if (nop == 0) 791 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 792 } 793 794 switch (op_nr) { 795 case OP_CB_GETATTR: 796 case OP_CB_RECALL: 797 case OP_CB_SEQUENCE: 798 case OP_CB_RECALL_ANY: 799 case OP_CB_RECALL_SLOT: 800 case OP_CB_LAYOUTRECALL: 801 case OP_CB_NOTIFY_DEVICEID: 802 case OP_CB_NOTIFY_LOCK: 803 *op = &callback_ops[op_nr]; 804 break; 805 806 case OP_CB_NOTIFY: 807 case OP_CB_PUSH_DELEG: 808 case OP_CB_RECALLABLE_OBJ_AVAIL: 809 case OP_CB_WANTS_CANCELLED: 810 return htonl(NFS4ERR_NOTSUPP); 811 812 default: 813 return htonl(NFS4ERR_OP_ILLEGAL); 814 } 815 816 return htonl(NFS_OK); 817 } 818 819 static void nfs4_callback_free_slot(struct nfs4_session *session, 820 struct nfs4_slot *slot) 821 { 822 struct nfs4_slot_table *tbl = &session->bc_slot_table; 823 824 spin_lock(&tbl->slot_tbl_lock); 825 /* 826 * Let the state manager know callback processing done. 827 * A single slot, so highest used slotid is either 0 or -1 828 */ 829 nfs4_free_slot(tbl, slot); 830 spin_unlock(&tbl->slot_tbl_lock); 831 } 832 833 static void nfs4_cb_free_slot(struct cb_process_state *cps) 834 { 835 if (cps->slot) { 836 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 837 cps->slot = NULL; 838 } 839 } 840 841 #ifdef CONFIG_NFS_V4_2 842 static __be32 843 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 844 { 845 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 846 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 847 return status; 848 849 if (op_nr == OP_CB_OFFLOAD) { 850 *op = &callback_ops[op_nr]; 851 return htonl(NFS_OK); 852 } else 853 return htonl(NFS4ERR_NOTSUPP); 854 return htonl(NFS4ERR_OP_ILLEGAL); 855 } 856 #else /* CONFIG_NFS_V4_2 */ 857 static __be32 858 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 859 { 860 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 861 } 862 #endif /* CONFIG_NFS_V4_2 */ 863 864 static __be32 865 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 866 { 867 switch (op_nr) { 868 case OP_CB_GETATTR: 869 case OP_CB_RECALL: 870 *op = &callback_ops[op_nr]; 871 break; 872 default: 873 return htonl(NFS4ERR_OP_ILLEGAL); 874 } 875 876 return htonl(NFS_OK); 877 } 878 879 static __be32 process_op(int nop, struct svc_rqst *rqstp, 880 struct cb_process_state *cps) 881 { 882 struct xdr_stream *xdr_out = &rqstp->rq_res_stream; 883 struct callback_op *op = &callback_ops[0]; 884 unsigned int op_nr; 885 __be32 status; 886 long maxlen; 887 __be32 res; 888 889 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr); 890 if (unlikely(status)) 891 return status; 892 893 switch (cps->minorversion) { 894 case 0: 895 status = preprocess_nfs4_op(op_nr, &op); 896 break; 897 case 1: 898 status = preprocess_nfs41_op(nop, op_nr, &op); 899 break; 900 case 2: 901 status = preprocess_nfs42_op(nop, op_nr, &op); 902 break; 903 default: 904 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 905 } 906 907 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 908 op_nr = OP_CB_ILLEGAL; 909 if (status) 910 goto encode_hdr; 911 912 if (cps->drc_status) { 913 status = cps->drc_status; 914 goto encode_hdr; 915 } 916 917 maxlen = xdr_out->end - xdr_out->p; 918 if (maxlen > 0 && maxlen < PAGE_SIZE) { 919 status = op->decode_args(rqstp, &rqstp->rq_arg_stream, 920 rqstp->rq_argp); 921 if (likely(status == 0)) 922 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp, 923 cps); 924 } else 925 status = htonl(NFS4ERR_RESOURCE); 926 927 encode_hdr: 928 res = encode_op_hdr(xdr_out, op_nr, status); 929 if (unlikely(res)) 930 return res; 931 if (op->encode_res != NULL && status == 0) 932 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp); 933 return status; 934 } 935 936 /* 937 * Decode, process and encode a COMPOUND 938 */ 939 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp) 940 { 941 struct cb_compound_hdr_arg hdr_arg = { 0 }; 942 struct cb_compound_hdr_res hdr_res = { NULL }; 943 struct cb_process_state cps = { 944 .drc_status = 0, 945 .clp = NULL, 946 .net = SVC_NET(rqstp), 947 }; 948 unsigned int nops = 0; 949 __be32 status; 950 951 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &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) { 958 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident); 959 goto out_invalidcred; 960 } 961 if (!check_gss_callback_principal(cps.clp, rqstp)) { 962 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident); 963 nfs_put_client(cps.clp); 964 goto out_invalidcred; 965 } 966 svc_xprt_set_valid(rqstp->rq_xprt); 967 } 968 969 cps.minorversion = hdr_arg.minorversion; 970 hdr_res.taglen = hdr_arg.taglen; 971 hdr_res.tag = hdr_arg.tag; 972 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) { 973 if (cps.clp) 974 nfs_put_client(cps.clp); 975 return rpc_system_err; 976 } 977 while (status == 0 && nops != hdr_arg.nops) { 978 status = process_op(nops, rqstp, &cps); 979 nops++; 980 } 981 982 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 983 * resource error in cb_compound status without returning op */ 984 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 985 status = htonl(NFS4ERR_RESOURCE); 986 nops--; 987 } 988 989 if (svc_is_backchannel(rqstp) && cps.clp) { 990 rqstp->bc_to_initval = cps.clp->cl_rpcclient->cl_timeout->to_initval; 991 rqstp->bc_to_retries = cps.clp->cl_rpcclient->cl_timeout->to_retries; 992 } 993 994 *hdr_res.status = status; 995 *hdr_res.nops = htonl(nops); 996 nfs4_cb_free_slot(&cps); 997 nfs_put_client(cps.clp); 998 return rpc_success; 999 1000 out_invalidcred: 1001 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 1002 rqstp->rq_auth_stat = rpc_autherr_badcred; 1003 return rpc_success; 1004 } 1005 1006 static int 1007 nfs_callback_dispatch(struct svc_rqst *rqstp) 1008 { 1009 const struct svc_procedure *procp = rqstp->rq_procinfo; 1010 1011 *rqstp->rq_accept_statp = procp->pc_func(rqstp); 1012 return 1; 1013 } 1014 1015 /* 1016 * Define NFS4 callback COMPOUND ops. 1017 */ 1018 static struct callback_op callback_ops[] = { 1019 [0] = { 1020 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 1021 }, 1022 [OP_CB_GETATTR] = { 1023 .process_op = nfs4_callback_getattr, 1024 .decode_args = decode_getattr_args, 1025 .encode_res = encode_getattr_res, 1026 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 1027 }, 1028 [OP_CB_RECALL] = { 1029 .process_op = nfs4_callback_recall, 1030 .decode_args = decode_recall_args, 1031 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 1032 }, 1033 [OP_CB_LAYOUTRECALL] = { 1034 .process_op = nfs4_callback_layoutrecall, 1035 .decode_args = decode_layoutrecall_args, 1036 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 1037 }, 1038 [OP_CB_NOTIFY_DEVICEID] = { 1039 .process_op = nfs4_callback_devicenotify, 1040 .decode_args = decode_devicenotify_args, 1041 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 1042 }, 1043 [OP_CB_SEQUENCE] = { 1044 .process_op = nfs4_callback_sequence, 1045 .decode_args = decode_cb_sequence_args, 1046 .encode_res = encode_cb_sequence_res, 1047 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 1048 }, 1049 [OP_CB_RECALL_ANY] = { 1050 .process_op = nfs4_callback_recallany, 1051 .decode_args = decode_recallany_args, 1052 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 1053 }, 1054 [OP_CB_RECALL_SLOT] = { 1055 .process_op = nfs4_callback_recallslot, 1056 .decode_args = decode_recallslot_args, 1057 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 1058 }, 1059 [OP_CB_NOTIFY_LOCK] = { 1060 .process_op = nfs4_callback_notify_lock, 1061 .decode_args = decode_notify_lock_args, 1062 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 1063 }, 1064 #ifdef CONFIG_NFS_V4_2 1065 [OP_CB_OFFLOAD] = { 1066 .process_op = nfs4_callback_offload, 1067 .decode_args = decode_offload_args, 1068 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ, 1069 }, 1070 #endif /* CONFIG_NFS_V4_2 */ 1071 }; 1072 1073 /* 1074 * Define NFS4 callback procedures 1075 */ 1076 static const struct svc_procedure nfs4_callback_procedures1[] = { 1077 [CB_NULL] = { 1078 .pc_func = nfs4_callback_null, 1079 .pc_encode = nfs4_encode_void, 1080 .pc_xdrressize = 1, 1081 .pc_name = "NULL", 1082 }, 1083 [CB_COMPOUND] = { 1084 .pc_func = nfs4_callback_compound, 1085 .pc_encode = nfs4_encode_void, 1086 .pc_argsize = 256, 1087 .pc_argzero = 256, 1088 .pc_ressize = 256, 1089 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1090 .pc_name = "COMPOUND", 1091 } 1092 }; 1093 1094 static DEFINE_PER_CPU_ALIGNED(unsigned long, 1095 nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]); 1096 const struct svc_version nfs4_callback_version1 = { 1097 .vs_vers = 1, 1098 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1099 .vs_proc = nfs4_callback_procedures1, 1100 .vs_count = nfs4_callback_count1, 1101 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1102 .vs_dispatch = nfs_callback_dispatch, 1103 .vs_hidden = true, 1104 .vs_need_cong_ctrl = true, 1105 }; 1106 1107 static DEFINE_PER_CPU_ALIGNED(unsigned long, 1108 nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]); 1109 const struct svc_version nfs4_callback_version4 = { 1110 .vs_vers = 4, 1111 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1112 .vs_proc = nfs4_callback_procedures1, 1113 .vs_count = nfs4_callback_count4, 1114 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1115 .vs_dispatch = nfs_callback_dispatch, 1116 .vs_hidden = true, 1117 .vs_need_cong_ctrl = true, 1118 }; 1119