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_array(n, sizeof(*args->devs), GFP_KERNEL); 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_array(rc_list->rcl_nrefcalls, 382 sizeof(*rc_list->rcl_refcalls), 383 GFP_KERNEL); 384 if (unlikely(rc_list->rcl_refcalls == NULL)) 385 goto out; 386 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 387 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 388 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 389 } 390 } 391 status = 0; 392 393 out: 394 return status; 395 } 396 397 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 398 struct xdr_stream *xdr, 399 void *argp) 400 { 401 struct cb_sequenceargs *args = argp; 402 __be32 *p; 403 int i; 404 __be32 status; 405 406 status = decode_sessionid(xdr, &args->csa_sessionid); 407 if (status) 408 return status; 409 410 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t)); 411 if (unlikely(p == NULL)) 412 return htonl(NFS4ERR_RESOURCE); 413 414 args->csa_addr = svc_addr(rqstp); 415 args->csa_sequenceid = ntohl(*p++); 416 args->csa_slotid = ntohl(*p++); 417 args->csa_highestslotid = ntohl(*p++); 418 args->csa_cachethis = ntohl(*p++); 419 args->csa_nrclists = ntohl(*p++); 420 args->csa_rclists = NULL; 421 if (args->csa_nrclists) { 422 args->csa_rclists = kmalloc_array(args->csa_nrclists, 423 sizeof(*args->csa_rclists), 424 GFP_KERNEL); 425 if (unlikely(args->csa_rclists == NULL)) 426 return htonl(NFS4ERR_RESOURCE); 427 428 for (i = 0; i < args->csa_nrclists; i++) { 429 status = decode_rc_list(xdr, &args->csa_rclists[i]); 430 if (status) { 431 args->csa_nrclists = i; 432 goto out_free; 433 } 434 } 435 } 436 return 0; 437 438 out_free: 439 for (i = 0; i < args->csa_nrclists; i++) 440 kfree(args->csa_rclists[i].rcl_refcalls); 441 kfree(args->csa_rclists); 442 return status; 443 } 444 445 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 446 struct xdr_stream *xdr, 447 void *argp) 448 { 449 struct cb_recallanyargs *args = argp; 450 uint32_t bitmap[3]; 451 __be32 *p, status; 452 453 p = xdr_inline_decode(xdr, 4); 454 if (unlikely(p == NULL)) 455 return htonl(NFS4ERR_BADXDR); 456 args->craa_objs_to_keep = ntohl(*p++); 457 status = decode_bitmap(xdr, bitmap); 458 if (unlikely(status)) 459 return status; 460 args->craa_type_mask = bitmap[0]; 461 462 return 0; 463 } 464 465 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 466 struct xdr_stream *xdr, 467 void *argp) 468 { 469 struct cb_recallslotargs *args = argp; 470 __be32 *p; 471 472 p = xdr_inline_decode(xdr, 4); 473 if (unlikely(p == NULL)) 474 return htonl(NFS4ERR_BADXDR); 475 args->crsa_target_highest_slotid = ntohl(*p++); 476 return 0; 477 } 478 479 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) 480 { 481 __be32 *p; 482 unsigned int len; 483 484 p = xdr_inline_decode(xdr, 12); 485 if (unlikely(p == NULL)) 486 return htonl(NFS4ERR_BADXDR); 487 488 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); 489 len = be32_to_cpu(*p); 490 491 p = xdr_inline_decode(xdr, len); 492 if (unlikely(p == NULL)) 493 return htonl(NFS4ERR_BADXDR); 494 495 /* Only try to decode if the length is right */ 496 if (len == 20) { 497 p += 2; /* skip "lock id:" */ 498 args->cbnl_owner.s_dev = be32_to_cpu(*p++); 499 xdr_decode_hyper(p, &args->cbnl_owner.id); 500 args->cbnl_valid = true; 501 } else { 502 args->cbnl_owner.s_dev = 0; 503 args->cbnl_owner.id = 0; 504 args->cbnl_valid = false; 505 } 506 return 0; 507 } 508 509 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, 510 struct xdr_stream *xdr, void *argp) 511 { 512 struct cb_notify_lock_args *args = argp; 513 __be32 status; 514 515 status = decode_fh(xdr, &args->cbnl_fh); 516 if (unlikely(status != 0)) 517 return status; 518 return decode_lockowner(xdr, args); 519 } 520 521 #ifdef CONFIG_NFS_V4_2 522 static __be32 decode_write_response(struct xdr_stream *xdr, 523 struct cb_offloadargs *args) 524 { 525 __be32 *p; 526 527 /* skip the always zero field */ 528 p = xdr_inline_decode(xdr, 4); 529 if (unlikely(!p)) 530 goto out; 531 p++; 532 533 /* decode count, stable_how, verifier */ 534 p = xdr_inline_decode(xdr, 8 + 4); 535 if (unlikely(!p)) 536 goto out; 537 p = xdr_decode_hyper(p, &args->wr_count); 538 args->wr_writeverf.committed = be32_to_cpup(p); 539 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE); 540 if (likely(p)) { 541 memcpy(&args->wr_writeverf.verifier.data[0], p, 542 NFS4_VERIFIER_SIZE); 543 return 0; 544 } 545 out: 546 return htonl(NFS4ERR_RESOURCE); 547 } 548 549 static __be32 decode_offload_args(struct svc_rqst *rqstp, 550 struct xdr_stream *xdr, 551 void *data) 552 { 553 struct cb_offloadargs *args = data; 554 __be32 *p; 555 __be32 status; 556 557 /* decode fh */ 558 status = decode_fh(xdr, &args->coa_fh); 559 if (unlikely(status != 0)) 560 return status; 561 562 /* decode stateid */ 563 status = decode_stateid(xdr, &args->coa_stateid); 564 if (unlikely(status != 0)) 565 return status; 566 567 /* decode status */ 568 p = xdr_inline_decode(xdr, 4); 569 if (unlikely(!p)) 570 goto out; 571 args->error = ntohl(*p++); 572 if (!args->error) { 573 status = decode_write_response(xdr, args); 574 if (unlikely(status != 0)) 575 return status; 576 } else { 577 p = xdr_inline_decode(xdr, 8); 578 if (unlikely(!p)) 579 goto out; 580 p = xdr_decode_hyper(p, &args->wr_count); 581 } 582 return 0; 583 out: 584 return htonl(NFS4ERR_RESOURCE); 585 } 586 #endif /* CONFIG_NFS_V4_2 */ 587 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 588 { 589 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 590 return cpu_to_be32(NFS4ERR_RESOURCE); 591 return 0; 592 } 593 594 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz) 595 { 596 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0) 597 return cpu_to_be32(NFS4ERR_RESOURCE); 598 return 0; 599 } 600 601 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 602 { 603 __be32 *p; 604 605 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 606 return 0; 607 p = xdr_reserve_space(xdr, 8); 608 if (unlikely(!p)) 609 return htonl(NFS4ERR_RESOURCE); 610 p = xdr_encode_hyper(p, change); 611 return 0; 612 } 613 614 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 615 { 616 __be32 *p; 617 618 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 619 return 0; 620 p = xdr_reserve_space(xdr, 8); 621 if (unlikely(!p)) 622 return htonl(NFS4ERR_RESOURCE); 623 p = xdr_encode_hyper(p, size); 624 return 0; 625 } 626 627 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time) 628 { 629 __be32 *p; 630 631 p = xdr_reserve_space(xdr, 12); 632 if (unlikely(!p)) 633 return htonl(NFS4ERR_RESOURCE); 634 p = xdr_encode_hyper(p, time->tv_sec); 635 *p = htonl(time->tv_nsec); 636 return 0; 637 } 638 639 static __be32 encode_attr_atime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 640 { 641 if (!(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) 642 return 0; 643 return encode_attr_time(xdr,time); 644 } 645 646 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 647 { 648 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 649 return 0; 650 return encode_attr_time(xdr,time); 651 } 652 653 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 654 { 655 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 656 return 0; 657 return encode_attr_time(xdr,time); 658 } 659 660 static __be32 encode_attr_delegatime(struct xdr_stream *xdr, 661 const uint32_t *bitmap, 662 const struct timespec64 *time) 663 { 664 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_ACCESS)) 665 return 0; 666 return encode_attr_time(xdr,time); 667 } 668 669 static __be32 encode_attr_delegmtime(struct xdr_stream *xdr, 670 const uint32_t *bitmap, 671 const struct timespec64 *time) 672 { 673 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_MODIFY)) 674 return 0; 675 return encode_attr_time(xdr,time); 676 } 677 678 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 679 { 680 __be32 status; 681 682 hdr->status = xdr_reserve_space(xdr, 4); 683 if (unlikely(hdr->status == NULL)) 684 return htonl(NFS4ERR_RESOURCE); 685 status = encode_string(xdr, hdr->taglen, hdr->tag); 686 if (unlikely(status != 0)) 687 return status; 688 hdr->nops = xdr_reserve_space(xdr, 4); 689 if (unlikely(hdr->nops == NULL)) 690 return htonl(NFS4ERR_RESOURCE); 691 return 0; 692 } 693 694 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 695 { 696 __be32 *p; 697 698 p = xdr_reserve_space(xdr, 8); 699 if (unlikely(p == NULL)) 700 return htonl(NFS4ERR_RESOURCE_HDR); 701 *p++ = htonl(op); 702 *p = res; 703 return 0; 704 } 705 706 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, 707 const void *resp) 708 { 709 const struct cb_getattrres *res = resp; 710 __be32 *savep = NULL; 711 __be32 status = res->status; 712 713 if (unlikely(status != 0)) 714 goto out; 715 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap)); 716 if (unlikely(status != 0)) 717 goto out; 718 status = cpu_to_be32(NFS4ERR_RESOURCE); 719 savep = xdr_reserve_space(xdr, sizeof(*savep)); 720 if (unlikely(!savep)) 721 goto out; 722 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 723 if (unlikely(status != 0)) 724 goto out; 725 status = encode_attr_size(xdr, res->bitmap, res->size); 726 if (unlikely(status != 0)) 727 goto out; 728 status = encode_attr_atime(xdr, res->bitmap, &res->atime); 729 if (unlikely(status != 0)) 730 goto out; 731 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 732 if (unlikely(status != 0)) 733 goto out; 734 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 735 if (unlikely(status != 0)) 736 goto out; 737 status = encode_attr_delegatime(xdr, res->bitmap, &res->atime); 738 if (unlikely(status != 0)) 739 goto out; 740 status = encode_attr_delegmtime(xdr, res->bitmap, &res->mtime); 741 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 742 out: 743 return status; 744 } 745 746 static __be32 encode_sessionid(struct xdr_stream *xdr, 747 const struct nfs4_sessionid *sid) 748 { 749 __be32 *p; 750 751 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 752 if (unlikely(p == NULL)) 753 return htonl(NFS4ERR_RESOURCE); 754 755 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 756 return 0; 757 } 758 759 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 760 struct xdr_stream *xdr, 761 const void *resp) 762 { 763 const struct cb_sequenceres *res = resp; 764 __be32 *p; 765 __be32 status = res->csr_status; 766 767 if (unlikely(status != 0)) 768 return status; 769 770 status = encode_sessionid(xdr, &res->csr_sessionid); 771 if (status) 772 return status; 773 774 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 775 if (unlikely(p == NULL)) 776 return htonl(NFS4ERR_RESOURCE); 777 778 *p++ = htonl(res->csr_sequenceid); 779 *p++ = htonl(res->csr_slotid); 780 *p++ = htonl(res->csr_highestslotid); 781 *p++ = htonl(res->csr_target_highestslotid); 782 return 0; 783 } 784 785 static __be32 786 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 787 { 788 if (op_nr == OP_CB_SEQUENCE) { 789 if (nop != 0) 790 return htonl(NFS4ERR_SEQUENCE_POS); 791 } else { 792 if (nop == 0) 793 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 794 } 795 796 switch (op_nr) { 797 case OP_CB_GETATTR: 798 case OP_CB_RECALL: 799 case OP_CB_SEQUENCE: 800 case OP_CB_RECALL_ANY: 801 case OP_CB_RECALL_SLOT: 802 case OP_CB_LAYOUTRECALL: 803 case OP_CB_NOTIFY_DEVICEID: 804 case OP_CB_NOTIFY_LOCK: 805 *op = &callback_ops[op_nr]; 806 break; 807 808 case OP_CB_NOTIFY: 809 case OP_CB_PUSH_DELEG: 810 case OP_CB_RECALLABLE_OBJ_AVAIL: 811 case OP_CB_WANTS_CANCELLED: 812 return htonl(NFS4ERR_NOTSUPP); 813 814 default: 815 return htonl(NFS4ERR_OP_ILLEGAL); 816 } 817 818 return htonl(NFS_OK); 819 } 820 821 static void nfs4_callback_free_slot(struct nfs4_session *session, 822 struct nfs4_slot *slot) 823 { 824 struct nfs4_slot_table *tbl = &session->bc_slot_table; 825 826 spin_lock(&tbl->slot_tbl_lock); 827 /* 828 * Let the state manager know callback processing done. 829 * A single slot, so highest used slotid is either 0 or -1 830 */ 831 nfs4_free_slot(tbl, slot); 832 spin_unlock(&tbl->slot_tbl_lock); 833 } 834 835 static void nfs4_cb_free_slot(struct cb_process_state *cps) 836 { 837 if (cps->slot) { 838 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 839 cps->slot = NULL; 840 } 841 } 842 843 #ifdef CONFIG_NFS_V4_2 844 static __be32 845 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 846 { 847 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 848 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 849 return status; 850 851 if (op_nr == OP_CB_OFFLOAD) { 852 *op = &callback_ops[op_nr]; 853 return htonl(NFS_OK); 854 } else 855 return htonl(NFS4ERR_NOTSUPP); 856 return htonl(NFS4ERR_OP_ILLEGAL); 857 } 858 #else /* CONFIG_NFS_V4_2 */ 859 static __be32 860 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 861 { 862 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 863 } 864 #endif /* CONFIG_NFS_V4_2 */ 865 866 static __be32 867 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 868 { 869 switch (op_nr) { 870 case OP_CB_GETATTR: 871 case OP_CB_RECALL: 872 *op = &callback_ops[op_nr]; 873 break; 874 default: 875 return htonl(NFS4ERR_OP_ILLEGAL); 876 } 877 878 return htonl(NFS_OK); 879 } 880 881 static __be32 process_op(int nop, struct svc_rqst *rqstp, 882 struct cb_process_state *cps) 883 { 884 struct xdr_stream *xdr_out = &rqstp->rq_res_stream; 885 struct callback_op *op = &callback_ops[0]; 886 unsigned int op_nr; 887 __be32 status; 888 long maxlen; 889 __be32 res; 890 891 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr); 892 if (unlikely(status)) 893 return status; 894 895 switch (cps->minorversion) { 896 case 0: 897 status = preprocess_nfs4_op(op_nr, &op); 898 break; 899 case 1: 900 status = preprocess_nfs41_op(nop, op_nr, &op); 901 break; 902 case 2: 903 status = preprocess_nfs42_op(nop, op_nr, &op); 904 break; 905 default: 906 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 907 } 908 909 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 910 op_nr = OP_CB_ILLEGAL; 911 if (status) 912 goto encode_hdr; 913 914 if (cps->drc_status) { 915 status = cps->drc_status; 916 goto encode_hdr; 917 } 918 919 maxlen = xdr_out->end - xdr_out->p; 920 if (maxlen > 0 && maxlen < PAGE_SIZE) { 921 status = op->decode_args(rqstp, &rqstp->rq_arg_stream, 922 rqstp->rq_argp); 923 if (likely(status == 0)) 924 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp, 925 cps); 926 } else 927 status = htonl(NFS4ERR_RESOURCE); 928 929 encode_hdr: 930 res = encode_op_hdr(xdr_out, op_nr, status); 931 if (unlikely(res)) 932 return res; 933 if (op->encode_res != NULL && status == 0) 934 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp); 935 return status; 936 } 937 938 /* 939 * Decode, process and encode a COMPOUND 940 */ 941 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp) 942 { 943 struct cb_compound_hdr_arg hdr_arg = { 0 }; 944 struct cb_compound_hdr_res hdr_res = { NULL }; 945 struct cb_process_state cps = { 946 .drc_status = 0, 947 .clp = NULL, 948 .net = SVC_NET(rqstp), 949 }; 950 unsigned int nops = 0; 951 __be32 status; 952 953 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg); 954 if (status == htonl(NFS4ERR_RESOURCE)) 955 return rpc_garbage_args; 956 957 if (hdr_arg.minorversion == 0) { 958 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 959 if (!cps.clp) { 960 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident); 961 goto out_invalidcred; 962 } 963 if (!check_gss_callback_principal(cps.clp, rqstp)) { 964 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident); 965 nfs_put_client(cps.clp); 966 goto out_invalidcred; 967 } 968 svc_xprt_set_valid(rqstp->rq_xprt); 969 } 970 971 cps.minorversion = hdr_arg.minorversion; 972 hdr_res.taglen = hdr_arg.taglen; 973 hdr_res.tag = hdr_arg.tag; 974 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) { 975 if (cps.clp) 976 nfs_put_client(cps.clp); 977 return rpc_system_err; 978 } 979 while (status == 0 && nops != hdr_arg.nops) { 980 status = process_op(nops, rqstp, &cps); 981 nops++; 982 } 983 984 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 985 * resource error in cb_compound status without returning op */ 986 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 987 status = htonl(NFS4ERR_RESOURCE); 988 nops--; 989 } 990 991 if (svc_is_backchannel(rqstp) && cps.clp) { 992 rqstp->bc_to_initval = cps.clp->cl_rpcclient->cl_timeout->to_initval; 993 rqstp->bc_to_retries = cps.clp->cl_rpcclient->cl_timeout->to_retries; 994 } 995 996 *hdr_res.status = status; 997 *hdr_res.nops = htonl(nops); 998 nfs4_cb_free_slot(&cps); 999 nfs_put_client(cps.clp); 1000 return rpc_success; 1001 1002 out_invalidcred: 1003 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 1004 rqstp->rq_auth_stat = rpc_autherr_badcred; 1005 return rpc_success; 1006 } 1007 1008 static int 1009 nfs_callback_dispatch(struct svc_rqst *rqstp) 1010 { 1011 const struct svc_procedure *procp = rqstp->rq_procinfo; 1012 1013 *rqstp->rq_accept_statp = procp->pc_func(rqstp); 1014 return 1; 1015 } 1016 1017 /* 1018 * Define NFS4 callback COMPOUND ops. 1019 */ 1020 static struct callback_op callback_ops[] = { 1021 [0] = { 1022 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 1023 }, 1024 [OP_CB_GETATTR] = { 1025 .process_op = nfs4_callback_getattr, 1026 .decode_args = decode_getattr_args, 1027 .encode_res = encode_getattr_res, 1028 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 1029 }, 1030 [OP_CB_RECALL] = { 1031 .process_op = nfs4_callback_recall, 1032 .decode_args = decode_recall_args, 1033 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 1034 }, 1035 [OP_CB_LAYOUTRECALL] = { 1036 .process_op = nfs4_callback_layoutrecall, 1037 .decode_args = decode_layoutrecall_args, 1038 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 1039 }, 1040 [OP_CB_NOTIFY_DEVICEID] = { 1041 .process_op = nfs4_callback_devicenotify, 1042 .decode_args = decode_devicenotify_args, 1043 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 1044 }, 1045 [OP_CB_SEQUENCE] = { 1046 .process_op = nfs4_callback_sequence, 1047 .decode_args = decode_cb_sequence_args, 1048 .encode_res = encode_cb_sequence_res, 1049 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 1050 }, 1051 [OP_CB_RECALL_ANY] = { 1052 .process_op = nfs4_callback_recallany, 1053 .decode_args = decode_recallany_args, 1054 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 1055 }, 1056 [OP_CB_RECALL_SLOT] = { 1057 .process_op = nfs4_callback_recallslot, 1058 .decode_args = decode_recallslot_args, 1059 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 1060 }, 1061 [OP_CB_NOTIFY_LOCK] = { 1062 .process_op = nfs4_callback_notify_lock, 1063 .decode_args = decode_notify_lock_args, 1064 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 1065 }, 1066 #ifdef CONFIG_NFS_V4_2 1067 [OP_CB_OFFLOAD] = { 1068 .process_op = nfs4_callback_offload, 1069 .decode_args = decode_offload_args, 1070 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ, 1071 }, 1072 #endif /* CONFIG_NFS_V4_2 */ 1073 }; 1074 1075 /* 1076 * Define NFS4 callback procedures 1077 */ 1078 static const struct svc_procedure nfs4_callback_procedures1[] = { 1079 [CB_NULL] = { 1080 .pc_func = nfs4_callback_null, 1081 .pc_encode = nfs4_encode_void, 1082 .pc_xdrressize = 1, 1083 .pc_name = "NULL", 1084 }, 1085 [CB_COMPOUND] = { 1086 .pc_func = nfs4_callback_compound, 1087 .pc_encode = nfs4_encode_void, 1088 .pc_argsize = 256, 1089 .pc_argzero = 256, 1090 .pc_ressize = 256, 1091 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1092 .pc_name = "COMPOUND", 1093 } 1094 }; 1095 1096 static DEFINE_PER_CPU_ALIGNED(unsigned long, 1097 nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]); 1098 const struct svc_version nfs4_callback_version1 = { 1099 .vs_vers = 1, 1100 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1101 .vs_proc = nfs4_callback_procedures1, 1102 .vs_count = nfs4_callback_count1, 1103 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1104 .vs_dispatch = nfs_callback_dispatch, 1105 .vs_hidden = true, 1106 .vs_need_cong_ctrl = true, 1107 }; 1108 1109 static DEFINE_PER_CPU_ALIGNED(unsigned long, 1110 nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]); 1111 const struct svc_version nfs4_callback_version4 = { 1112 .vs_vers = 4, 1113 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1114 .vs_proc = nfs4_callback_procedures1, 1115 .vs_count = nfs4_callback_count4, 1116 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1117 .vs_dispatch = nfs_callback_dispatch, 1118 .vs_hidden = true, 1119 .vs_need_cong_ctrl = true, 1120 }; 1121