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, ctime, mtime */\ 29 (2 + 2 + 3 + 3) * 4) 30 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 31 32 #if defined(CONFIG_NFS_V4_1) 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 #endif /* CONFIG_NFS_V4_1 */ 42 #ifdef CONFIG_NFS_V4_2 43 #define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 44 #endif /* CONFIG_NFS_V4_2 */ 45 46 #define NFSDBG_FACILITY NFSDBG_CALLBACK 47 48 /* Internal error code */ 49 #define NFS4ERR_RESOURCE_HDR 11050 50 51 struct callback_op { 52 __be32 (*process_op)(void *, void *, struct cb_process_state *); 53 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *); 54 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *, 55 const void *); 56 long res_maxsize; 57 }; 58 59 static struct callback_op callback_ops[]; 60 61 static __be32 nfs4_callback_null(struct svc_rqst *rqstp) 62 { 63 return htonl(NFS4_OK); 64 } 65 66 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p) 67 { 68 return xdr_argsize_check(rqstp, p); 69 } 70 71 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p) 72 { 73 return xdr_ressize_check(rqstp, p); 74 } 75 76 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, 77 const char **str, size_t maxlen) 78 { 79 ssize_t err; 80 81 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen); 82 if (err < 0) 83 return cpu_to_be32(NFS4ERR_RESOURCE); 84 *len = err; 85 return 0; 86 } 87 88 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 89 { 90 __be32 *p; 91 92 p = xdr_inline_decode(xdr, 4); 93 if (unlikely(p == NULL)) 94 return htonl(NFS4ERR_RESOURCE); 95 fh->size = ntohl(*p); 96 if (fh->size > NFS4_FHSIZE) 97 return htonl(NFS4ERR_BADHANDLE); 98 p = xdr_inline_decode(xdr, fh->size); 99 if (unlikely(p == NULL)) 100 return htonl(NFS4ERR_RESOURCE); 101 memcpy(&fh->data[0], p, fh->size); 102 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 103 return 0; 104 } 105 106 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 107 { 108 __be32 *p; 109 unsigned int attrlen; 110 111 p = xdr_inline_decode(xdr, 4); 112 if (unlikely(p == NULL)) 113 return htonl(NFS4ERR_RESOURCE); 114 attrlen = ntohl(*p); 115 p = xdr_inline_decode(xdr, attrlen << 2); 116 if (unlikely(p == NULL)) 117 return htonl(NFS4ERR_RESOURCE); 118 if (likely(attrlen > 0)) 119 bitmap[0] = ntohl(*p++); 120 if (attrlen > 1) 121 bitmap[1] = 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 #if defined(CONFIG_NFS_V4_1) 207 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 208 { 209 stateid->type = NFS4_LAYOUT_STATEID_TYPE; 210 return decode_stateid(xdr, stateid); 211 } 212 213 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 214 struct xdr_stream *xdr, void *argp) 215 { 216 struct cb_layoutrecallargs *args = argp; 217 __be32 *p; 218 __be32 status = 0; 219 uint32_t iomode; 220 221 p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t)); 222 if (unlikely(p == NULL)) 223 return htonl(NFS4ERR_BADXDR); 224 225 args->cbl_layout_type = ntohl(*p++); 226 /* Depite the spec's xdr, iomode really belongs in the FILE switch, 227 * as it is unusable and ignored with the other types. 228 */ 229 iomode = ntohl(*p++); 230 args->cbl_layoutchanged = ntohl(*p++); 231 args->cbl_recall_type = ntohl(*p++); 232 233 if (args->cbl_recall_type == RETURN_FILE) { 234 args->cbl_range.iomode = iomode; 235 status = decode_fh(xdr, &args->cbl_fh); 236 if (unlikely(status != 0)) 237 return status; 238 239 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t)); 240 if (unlikely(p == NULL)) 241 return htonl(NFS4ERR_BADXDR); 242 p = xdr_decode_hyper(p, &args->cbl_range.offset); 243 p = xdr_decode_hyper(p, &args->cbl_range.length); 244 return decode_layout_stateid(xdr, &args->cbl_stateid); 245 } else if (args->cbl_recall_type == RETURN_FSID) { 246 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t)); 247 if (unlikely(p == NULL)) 248 return htonl(NFS4ERR_BADXDR); 249 p = xdr_decode_hyper(p, &args->cbl_fsid.major); 250 p = xdr_decode_hyper(p, &args->cbl_fsid.minor); 251 } else if (args->cbl_recall_type != RETURN_ALL) 252 return htonl(NFS4ERR_BADXDR); 253 return 0; 254 } 255 256 static 257 __be32 decode_devicenotify_args(struct svc_rqst *rqstp, 258 struct xdr_stream *xdr, 259 void *argp) 260 { 261 struct cb_devicenotifyargs *args = argp; 262 __be32 *p; 263 __be32 status = 0; 264 u32 tmp; 265 int n, i; 266 args->ndevs = 0; 267 268 /* Num of device notifications */ 269 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 270 if (unlikely(p == NULL)) { 271 status = htonl(NFS4ERR_BADXDR); 272 goto out; 273 } 274 n = ntohl(*p++); 275 if (n <= 0) 276 goto out; 277 if (n > ULONG_MAX / sizeof(*args->devs)) { 278 status = htonl(NFS4ERR_BADXDR); 279 goto out; 280 } 281 282 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL); 283 if (!args->devs) { 284 status = htonl(NFS4ERR_DELAY); 285 goto out; 286 } 287 288 /* Decode each dev notification */ 289 for (i = 0; i < n; i++) { 290 struct cb_devicenotifyitem *dev = &args->devs[i]; 291 292 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) + 293 NFS4_DEVICEID4_SIZE); 294 if (unlikely(p == NULL)) { 295 status = htonl(NFS4ERR_BADXDR); 296 goto err; 297 } 298 299 tmp = ntohl(*p++); /* bitmap size */ 300 if (tmp != 1) { 301 status = htonl(NFS4ERR_INVAL); 302 goto err; 303 } 304 dev->cbd_notify_type = ntohl(*p++); 305 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 306 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 307 status = htonl(NFS4ERR_INVAL); 308 goto err; 309 } 310 311 tmp = ntohl(*p++); /* opaque size */ 312 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 313 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 314 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 315 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 316 status = htonl(NFS4ERR_INVAL); 317 goto err; 318 } 319 dev->cbd_layout_type = ntohl(*p++); 320 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 321 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 322 323 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 324 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 325 if (unlikely(p == NULL)) { 326 status = htonl(NFS4ERR_BADXDR); 327 goto err; 328 } 329 dev->cbd_immediate = ntohl(*p++); 330 } else { 331 dev->cbd_immediate = 0; 332 } 333 334 args->ndevs++; 335 336 dprintk("%s: type %d layout 0x%x immediate %d\n", 337 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 338 dev->cbd_immediate); 339 } 340 out: 341 dprintk("%s: status %d ndevs %d\n", 342 __func__, ntohl(status), args->ndevs); 343 return status; 344 err: 345 kfree(args->devs); 346 goto out; 347 } 348 349 static __be32 decode_sessionid(struct xdr_stream *xdr, 350 struct nfs4_sessionid *sid) 351 { 352 __be32 *p; 353 354 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN); 355 if (unlikely(p == NULL)) 356 return htonl(NFS4ERR_RESOURCE); 357 358 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN); 359 return 0; 360 } 361 362 static __be32 decode_rc_list(struct xdr_stream *xdr, 363 struct referring_call_list *rc_list) 364 { 365 __be32 *p; 366 int i; 367 __be32 status; 368 369 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 370 if (status) 371 goto out; 372 373 status = htonl(NFS4ERR_RESOURCE); 374 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 375 if (unlikely(p == NULL)) 376 goto out; 377 378 rc_list->rcl_nrefcalls = ntohl(*p++); 379 if (rc_list->rcl_nrefcalls) { 380 p = xdr_inline_decode(xdr, 381 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 382 if (unlikely(p == NULL)) 383 goto out; 384 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls, 385 sizeof(*rc_list->rcl_refcalls), 386 GFP_KERNEL); 387 if (unlikely(rc_list->rcl_refcalls == NULL)) 388 goto out; 389 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 390 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 391 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 392 } 393 } 394 status = 0; 395 396 out: 397 return status; 398 } 399 400 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 401 struct xdr_stream *xdr, 402 void *argp) 403 { 404 struct cb_sequenceargs *args = argp; 405 __be32 *p; 406 int i; 407 __be32 status; 408 409 status = decode_sessionid(xdr, &args->csa_sessionid); 410 if (status) 411 return status; 412 413 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t)); 414 if (unlikely(p == NULL)) 415 return htonl(NFS4ERR_RESOURCE); 416 417 args->csa_addr = svc_addr(rqstp); 418 args->csa_sequenceid = ntohl(*p++); 419 args->csa_slotid = ntohl(*p++); 420 args->csa_highestslotid = ntohl(*p++); 421 args->csa_cachethis = ntohl(*p++); 422 args->csa_nrclists = ntohl(*p++); 423 args->csa_rclists = NULL; 424 if (args->csa_nrclists) { 425 args->csa_rclists = kmalloc_array(args->csa_nrclists, 426 sizeof(*args->csa_rclists), 427 GFP_KERNEL); 428 if (unlikely(args->csa_rclists == NULL)) 429 return htonl(NFS4ERR_RESOURCE); 430 431 for (i = 0; i < args->csa_nrclists; i++) { 432 status = decode_rc_list(xdr, &args->csa_rclists[i]); 433 if (status) { 434 args->csa_nrclists = i; 435 goto out_free; 436 } 437 } 438 } 439 return 0; 440 441 out_free: 442 for (i = 0; i < args->csa_nrclists; i++) 443 kfree(args->csa_rclists[i].rcl_refcalls); 444 kfree(args->csa_rclists); 445 return status; 446 } 447 448 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 449 struct xdr_stream *xdr, 450 void *argp) 451 { 452 struct cb_recallanyargs *args = argp; 453 uint32_t bitmap[2]; 454 __be32 *p, status; 455 456 p = xdr_inline_decode(xdr, 4); 457 if (unlikely(p == NULL)) 458 return htonl(NFS4ERR_BADXDR); 459 args->craa_objs_to_keep = ntohl(*p++); 460 status = decode_bitmap(xdr, bitmap); 461 if (unlikely(status)) 462 return status; 463 args->craa_type_mask = bitmap[0]; 464 465 return 0; 466 } 467 468 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 469 struct xdr_stream *xdr, 470 void *argp) 471 { 472 struct cb_recallslotargs *args = argp; 473 __be32 *p; 474 475 p = xdr_inline_decode(xdr, 4); 476 if (unlikely(p == NULL)) 477 return htonl(NFS4ERR_BADXDR); 478 args->crsa_target_highest_slotid = ntohl(*p++); 479 return 0; 480 } 481 482 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) 483 { 484 __be32 *p; 485 unsigned int len; 486 487 p = xdr_inline_decode(xdr, 12); 488 if (unlikely(p == NULL)) 489 return htonl(NFS4ERR_BADXDR); 490 491 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); 492 len = be32_to_cpu(*p); 493 494 p = xdr_inline_decode(xdr, len); 495 if (unlikely(p == NULL)) 496 return htonl(NFS4ERR_BADXDR); 497 498 /* Only try to decode if the length is right */ 499 if (len == 20) { 500 p += 2; /* skip "lock id:" */ 501 args->cbnl_owner.s_dev = be32_to_cpu(*p++); 502 xdr_decode_hyper(p, &args->cbnl_owner.id); 503 args->cbnl_valid = true; 504 } else { 505 args->cbnl_owner.s_dev = 0; 506 args->cbnl_owner.id = 0; 507 args->cbnl_valid = false; 508 } 509 return 0; 510 } 511 512 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, 513 struct xdr_stream *xdr, void *argp) 514 { 515 struct cb_notify_lock_args *args = argp; 516 __be32 status; 517 518 status = decode_fh(xdr, &args->cbnl_fh); 519 if (unlikely(status != 0)) 520 return status; 521 return decode_lockowner(xdr, args); 522 } 523 524 #endif /* CONFIG_NFS_V4_1 */ 525 #ifdef CONFIG_NFS_V4_2 526 static __be32 decode_write_response(struct xdr_stream *xdr, 527 struct cb_offloadargs *args) 528 { 529 __be32 *p; 530 531 /* skip the always zero field */ 532 p = xdr_inline_decode(xdr, 4); 533 if (unlikely(!p)) 534 goto out; 535 p++; 536 537 /* decode count, stable_how, verifier */ 538 p = xdr_inline_decode(xdr, 8 + 4); 539 if (unlikely(!p)) 540 goto out; 541 p = xdr_decode_hyper(p, &args->wr_count); 542 args->wr_writeverf.committed = be32_to_cpup(p); 543 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE); 544 if (likely(p)) { 545 memcpy(&args->wr_writeverf.verifier.data[0], p, 546 NFS4_VERIFIER_SIZE); 547 return 0; 548 } 549 out: 550 return htonl(NFS4ERR_RESOURCE); 551 } 552 553 static __be32 decode_offload_args(struct svc_rqst *rqstp, 554 struct xdr_stream *xdr, 555 void *data) 556 { 557 struct cb_offloadargs *args = data; 558 __be32 *p; 559 __be32 status; 560 561 /* decode fh */ 562 status = decode_fh(xdr, &args->coa_fh); 563 if (unlikely(status != 0)) 564 return status; 565 566 /* decode stateid */ 567 status = decode_stateid(xdr, &args->coa_stateid); 568 if (unlikely(status != 0)) 569 return status; 570 571 /* decode status */ 572 p = xdr_inline_decode(xdr, 4); 573 if (unlikely(!p)) 574 goto out; 575 args->error = ntohl(*p++); 576 if (!args->error) { 577 status = decode_write_response(xdr, args); 578 if (unlikely(status != 0)) 579 return status; 580 } else { 581 p = xdr_inline_decode(xdr, 8); 582 if (unlikely(!p)) 583 goto out; 584 p = xdr_decode_hyper(p, &args->wr_count); 585 } 586 return 0; 587 out: 588 return htonl(NFS4ERR_RESOURCE); 589 } 590 #endif /* CONFIG_NFS_V4_2 */ 591 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 592 { 593 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 594 return cpu_to_be32(NFS4ERR_RESOURCE); 595 return 0; 596 } 597 598 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz) 599 { 600 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0) 601 return cpu_to_be32(NFS4ERR_RESOURCE); 602 return 0; 603 } 604 605 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 606 { 607 __be32 *p; 608 609 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 610 return 0; 611 p = xdr_reserve_space(xdr, 8); 612 if (unlikely(!p)) 613 return htonl(NFS4ERR_RESOURCE); 614 p = xdr_encode_hyper(p, change); 615 return 0; 616 } 617 618 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 619 { 620 __be32 *p; 621 622 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 623 return 0; 624 p = xdr_reserve_space(xdr, 8); 625 if (unlikely(!p)) 626 return htonl(NFS4ERR_RESOURCE); 627 p = xdr_encode_hyper(p, size); 628 return 0; 629 } 630 631 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time) 632 { 633 __be32 *p; 634 635 p = xdr_reserve_space(xdr, 12); 636 if (unlikely(!p)) 637 return htonl(NFS4ERR_RESOURCE); 638 p = xdr_encode_hyper(p, time->tv_sec); 639 *p = htonl(time->tv_nsec); 640 return 0; 641 } 642 643 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 644 { 645 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 646 return 0; 647 return encode_attr_time(xdr,time); 648 } 649 650 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 651 { 652 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 653 return 0; 654 return encode_attr_time(xdr,time); 655 } 656 657 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 658 { 659 __be32 status; 660 661 hdr->status = xdr_reserve_space(xdr, 4); 662 if (unlikely(hdr->status == NULL)) 663 return htonl(NFS4ERR_RESOURCE); 664 status = encode_string(xdr, hdr->taglen, hdr->tag); 665 if (unlikely(status != 0)) 666 return status; 667 hdr->nops = xdr_reserve_space(xdr, 4); 668 if (unlikely(hdr->nops == NULL)) 669 return htonl(NFS4ERR_RESOURCE); 670 return 0; 671 } 672 673 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 674 { 675 __be32 *p; 676 677 p = xdr_reserve_space(xdr, 8); 678 if (unlikely(p == NULL)) 679 return htonl(NFS4ERR_RESOURCE_HDR); 680 *p++ = htonl(op); 681 *p = res; 682 return 0; 683 } 684 685 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, 686 const void *resp) 687 { 688 const struct cb_getattrres *res = resp; 689 __be32 *savep = NULL; 690 __be32 status = res->status; 691 692 if (unlikely(status != 0)) 693 goto out; 694 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap)); 695 if (unlikely(status != 0)) 696 goto out; 697 status = cpu_to_be32(NFS4ERR_RESOURCE); 698 savep = xdr_reserve_space(xdr, sizeof(*savep)); 699 if (unlikely(!savep)) 700 goto out; 701 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 702 if (unlikely(status != 0)) 703 goto out; 704 status = encode_attr_size(xdr, res->bitmap, res->size); 705 if (unlikely(status != 0)) 706 goto out; 707 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 708 if (unlikely(status != 0)) 709 goto out; 710 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 711 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 712 out: 713 return status; 714 } 715 716 #if defined(CONFIG_NFS_V4_1) 717 718 static __be32 encode_sessionid(struct xdr_stream *xdr, 719 const struct nfs4_sessionid *sid) 720 { 721 __be32 *p; 722 723 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 724 if (unlikely(p == NULL)) 725 return htonl(NFS4ERR_RESOURCE); 726 727 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 728 return 0; 729 } 730 731 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 732 struct xdr_stream *xdr, 733 const void *resp) 734 { 735 const struct cb_sequenceres *res = resp; 736 __be32 *p; 737 __be32 status = res->csr_status; 738 739 if (unlikely(status != 0)) 740 return status; 741 742 status = encode_sessionid(xdr, &res->csr_sessionid); 743 if (status) 744 return status; 745 746 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 747 if (unlikely(p == NULL)) 748 return htonl(NFS4ERR_RESOURCE); 749 750 *p++ = htonl(res->csr_sequenceid); 751 *p++ = htonl(res->csr_slotid); 752 *p++ = htonl(res->csr_highestslotid); 753 *p++ = htonl(res->csr_target_highestslotid); 754 return 0; 755 } 756 757 static __be32 758 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 759 { 760 if (op_nr == OP_CB_SEQUENCE) { 761 if (nop != 0) 762 return htonl(NFS4ERR_SEQUENCE_POS); 763 } else { 764 if (nop == 0) 765 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 766 } 767 768 switch (op_nr) { 769 case OP_CB_GETATTR: 770 case OP_CB_RECALL: 771 case OP_CB_SEQUENCE: 772 case OP_CB_RECALL_ANY: 773 case OP_CB_RECALL_SLOT: 774 case OP_CB_LAYOUTRECALL: 775 case OP_CB_NOTIFY_DEVICEID: 776 case OP_CB_NOTIFY_LOCK: 777 *op = &callback_ops[op_nr]; 778 break; 779 780 case OP_CB_NOTIFY: 781 case OP_CB_PUSH_DELEG: 782 case OP_CB_RECALLABLE_OBJ_AVAIL: 783 case OP_CB_WANTS_CANCELLED: 784 return htonl(NFS4ERR_NOTSUPP); 785 786 default: 787 return htonl(NFS4ERR_OP_ILLEGAL); 788 } 789 790 return htonl(NFS_OK); 791 } 792 793 static void nfs4_callback_free_slot(struct nfs4_session *session, 794 struct nfs4_slot *slot) 795 { 796 struct nfs4_slot_table *tbl = &session->bc_slot_table; 797 798 spin_lock(&tbl->slot_tbl_lock); 799 /* 800 * Let the state manager know callback processing done. 801 * A single slot, so highest used slotid is either 0 or -1 802 */ 803 nfs4_free_slot(tbl, slot); 804 spin_unlock(&tbl->slot_tbl_lock); 805 } 806 807 static void nfs4_cb_free_slot(struct cb_process_state *cps) 808 { 809 if (cps->slot) { 810 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 811 cps->slot = NULL; 812 } 813 } 814 815 #else /* CONFIG_NFS_V4_1 */ 816 817 static __be32 818 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 819 { 820 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 821 } 822 823 static void nfs4_cb_free_slot(struct cb_process_state *cps) 824 { 825 } 826 #endif /* CONFIG_NFS_V4_1 */ 827 828 #ifdef CONFIG_NFS_V4_2 829 static __be32 830 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 831 { 832 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 833 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 834 return status; 835 836 if (op_nr == OP_CB_OFFLOAD) { 837 *op = &callback_ops[op_nr]; 838 return htonl(NFS_OK); 839 } else 840 return htonl(NFS4ERR_NOTSUPP); 841 return htonl(NFS4ERR_OP_ILLEGAL); 842 } 843 #else /* CONFIG_NFS_V4_2 */ 844 static __be32 845 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 846 { 847 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 848 } 849 #endif /* CONFIG_NFS_V4_2 */ 850 851 static __be32 852 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 853 { 854 switch (op_nr) { 855 case OP_CB_GETATTR: 856 case OP_CB_RECALL: 857 *op = &callback_ops[op_nr]; 858 break; 859 default: 860 return htonl(NFS4ERR_OP_ILLEGAL); 861 } 862 863 return htonl(NFS_OK); 864 } 865 866 static __be32 process_op(int nop, struct svc_rqst *rqstp, 867 struct xdr_stream *xdr_in, void *argp, 868 struct xdr_stream *xdr_out, void *resp, 869 struct cb_process_state *cps) 870 { 871 struct callback_op *op = &callback_ops[0]; 872 unsigned int op_nr; 873 __be32 status; 874 long maxlen; 875 __be32 res; 876 877 status = decode_op_hdr(xdr_in, &op_nr); 878 if (unlikely(status)) 879 return status; 880 881 switch (cps->minorversion) { 882 case 0: 883 status = preprocess_nfs4_op(op_nr, &op); 884 break; 885 case 1: 886 status = preprocess_nfs41_op(nop, op_nr, &op); 887 break; 888 case 2: 889 status = preprocess_nfs42_op(nop, op_nr, &op); 890 break; 891 default: 892 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 893 } 894 895 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 896 op_nr = OP_CB_ILLEGAL; 897 if (status) 898 goto encode_hdr; 899 900 if (cps->drc_status) { 901 status = cps->drc_status; 902 goto encode_hdr; 903 } 904 905 maxlen = xdr_out->end - xdr_out->p; 906 if (maxlen > 0 && maxlen < PAGE_SIZE) { 907 status = op->decode_args(rqstp, xdr_in, argp); 908 if (likely(status == 0)) 909 status = op->process_op(argp, resp, cps); 910 } else 911 status = htonl(NFS4ERR_RESOURCE); 912 913 encode_hdr: 914 res = encode_op_hdr(xdr_out, op_nr, status); 915 if (unlikely(res)) 916 return res; 917 if (op->encode_res != NULL && status == 0) 918 status = op->encode_res(rqstp, xdr_out, resp); 919 return status; 920 } 921 922 /* 923 * Decode, process and encode a COMPOUND 924 */ 925 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp) 926 { 927 struct cb_compound_hdr_arg hdr_arg = { 0 }; 928 struct cb_compound_hdr_res hdr_res = { NULL }; 929 struct xdr_stream xdr_in, xdr_out; 930 __be32 *p, status; 931 struct cb_process_state cps = { 932 .drc_status = 0, 933 .clp = NULL, 934 .net = SVC_NET(rqstp), 935 }; 936 unsigned int nops = 0; 937 938 xdr_init_decode(&xdr_in, &rqstp->rq_arg, 939 rqstp->rq_arg.head[0].iov_base, NULL); 940 941 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 942 xdr_init_encode(&xdr_out, &rqstp->rq_res, p, NULL); 943 944 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 945 if (status == htonl(NFS4ERR_RESOURCE)) 946 return rpc_garbage_args; 947 948 if (hdr_arg.minorversion == 0) { 949 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 950 if (!cps.clp) { 951 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident); 952 goto out_invalidcred; 953 } 954 if (!check_gss_callback_principal(cps.clp, rqstp)) { 955 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident); 956 nfs_put_client(cps.clp); 957 goto out_invalidcred; 958 } 959 } 960 961 cps.minorversion = hdr_arg.minorversion; 962 hdr_res.taglen = hdr_arg.taglen; 963 hdr_res.tag = hdr_arg.tag; 964 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) { 965 if (cps.clp) 966 nfs_put_client(cps.clp); 967 return rpc_system_err; 968 } 969 while (status == 0 && nops != hdr_arg.nops) { 970 status = process_op(nops, rqstp, &xdr_in, 971 rqstp->rq_argp, &xdr_out, rqstp->rq_resp, 972 &cps); 973 nops++; 974 } 975 976 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 977 * resource error in cb_compound status without returning op */ 978 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 979 status = htonl(NFS4ERR_RESOURCE); 980 nops--; 981 } 982 983 *hdr_res.status = status; 984 *hdr_res.nops = htonl(nops); 985 nfs4_cb_free_slot(&cps); 986 nfs_put_client(cps.clp); 987 return rpc_success; 988 989 out_invalidcred: 990 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 991 return svc_return_autherr(rqstp, rpc_autherr_badcred); 992 } 993 994 /* 995 * Define NFS4 callback COMPOUND ops. 996 */ 997 static struct callback_op callback_ops[] = { 998 [0] = { 999 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 1000 }, 1001 [OP_CB_GETATTR] = { 1002 .process_op = nfs4_callback_getattr, 1003 .decode_args = decode_getattr_args, 1004 .encode_res = encode_getattr_res, 1005 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 1006 }, 1007 [OP_CB_RECALL] = { 1008 .process_op = nfs4_callback_recall, 1009 .decode_args = decode_recall_args, 1010 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 1011 }, 1012 #if defined(CONFIG_NFS_V4_1) 1013 [OP_CB_LAYOUTRECALL] = { 1014 .process_op = nfs4_callback_layoutrecall, 1015 .decode_args = decode_layoutrecall_args, 1016 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 1017 }, 1018 [OP_CB_NOTIFY_DEVICEID] = { 1019 .process_op = nfs4_callback_devicenotify, 1020 .decode_args = decode_devicenotify_args, 1021 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 1022 }, 1023 [OP_CB_SEQUENCE] = { 1024 .process_op = nfs4_callback_sequence, 1025 .decode_args = decode_cb_sequence_args, 1026 .encode_res = encode_cb_sequence_res, 1027 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 1028 }, 1029 [OP_CB_RECALL_ANY] = { 1030 .process_op = nfs4_callback_recallany, 1031 .decode_args = decode_recallany_args, 1032 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 1033 }, 1034 [OP_CB_RECALL_SLOT] = { 1035 .process_op = nfs4_callback_recallslot, 1036 .decode_args = decode_recallslot_args, 1037 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 1038 }, 1039 [OP_CB_NOTIFY_LOCK] = { 1040 .process_op = nfs4_callback_notify_lock, 1041 .decode_args = decode_notify_lock_args, 1042 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 1043 }, 1044 #endif /* CONFIG_NFS_V4_1 */ 1045 #ifdef CONFIG_NFS_V4_2 1046 [OP_CB_OFFLOAD] = { 1047 .process_op = nfs4_callback_offload, 1048 .decode_args = decode_offload_args, 1049 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ, 1050 }, 1051 #endif /* CONFIG_NFS_V4_2 */ 1052 }; 1053 1054 /* 1055 * Define NFS4 callback procedures 1056 */ 1057 static const struct svc_procedure nfs4_callback_procedures1[] = { 1058 [CB_NULL] = { 1059 .pc_func = nfs4_callback_null, 1060 .pc_decode = nfs4_decode_void, 1061 .pc_encode = nfs4_encode_void, 1062 .pc_xdrressize = 1, 1063 .pc_name = "NULL", 1064 }, 1065 [CB_COMPOUND] = { 1066 .pc_func = nfs4_callback_compound, 1067 .pc_encode = nfs4_encode_void, 1068 .pc_argsize = 256, 1069 .pc_ressize = 256, 1070 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1071 .pc_name = "COMPOUND", 1072 } 1073 }; 1074 1075 static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]; 1076 const struct svc_version nfs4_callback_version1 = { 1077 .vs_vers = 1, 1078 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1079 .vs_proc = nfs4_callback_procedures1, 1080 .vs_count = nfs4_callback_count1, 1081 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1082 .vs_dispatch = NULL, 1083 .vs_hidden = true, 1084 .vs_need_cong_ctrl = true, 1085 }; 1086 1087 static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]; 1088 const struct svc_version nfs4_callback_version4 = { 1089 .vs_vers = 4, 1090 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1091 .vs_proc = nfs4_callback_procedures1, 1092 .vs_count = nfs4_callback_count4, 1093 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1094 .vs_dispatch = NULL, 1095 .vs_hidden = true, 1096 .vs_need_cong_ctrl = true, 1097 }; 1098