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 /* 67 * svc_process_common() looks for an XDR encoder to know when 68 * not to drop a Reply. 69 */ 70 static bool nfs4_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr) 71 { 72 return true; 73 } 74 75 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, 76 const char **str, size_t maxlen) 77 { 78 ssize_t err; 79 80 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen); 81 if (err < 0) 82 return cpu_to_be32(NFS4ERR_RESOURCE); 83 *len = err; 84 return 0; 85 } 86 87 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 88 { 89 __be32 *p; 90 91 p = xdr_inline_decode(xdr, 4); 92 if (unlikely(p == NULL)) 93 return htonl(NFS4ERR_RESOURCE); 94 fh->size = ntohl(*p); 95 if (fh->size > NFS4_FHSIZE) 96 return htonl(NFS4ERR_BADHANDLE); 97 p = xdr_inline_decode(xdr, fh->size); 98 if (unlikely(p == NULL)) 99 return htonl(NFS4ERR_RESOURCE); 100 memcpy(&fh->data[0], p, fh->size); 101 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 102 return 0; 103 } 104 105 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 106 { 107 __be32 *p; 108 unsigned int attrlen; 109 110 p = xdr_inline_decode(xdr, 4); 111 if (unlikely(p == NULL)) 112 return htonl(NFS4ERR_RESOURCE); 113 attrlen = ntohl(*p); 114 p = xdr_inline_decode(xdr, attrlen << 2); 115 if (unlikely(p == NULL)) 116 return htonl(NFS4ERR_RESOURCE); 117 if (likely(attrlen > 0)) 118 bitmap[0] = ntohl(*p++); 119 if (attrlen > 1) 120 bitmap[1] = ntohl(*p); 121 return 0; 122 } 123 124 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 125 { 126 __be32 *p; 127 128 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 129 if (unlikely(p == NULL)) 130 return htonl(NFS4ERR_RESOURCE); 131 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 132 return 0; 133 } 134 135 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 136 { 137 stateid->type = NFS4_DELEGATION_STATEID_TYPE; 138 return decode_stateid(xdr, stateid); 139 } 140 141 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 142 { 143 __be32 *p; 144 __be32 status; 145 146 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ); 147 if (unlikely(status != 0)) 148 return status; 149 p = xdr_inline_decode(xdr, 12); 150 if (unlikely(p == NULL)) 151 return htonl(NFS4ERR_RESOURCE); 152 hdr->minorversion = ntohl(*p++); 153 /* Check for minor version support */ 154 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) { 155 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */ 156 } else { 157 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with " 158 "illegal minor version %u!\n", 159 __func__, hdr->minorversion); 160 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 161 } 162 hdr->nops = ntohl(*p); 163 return 0; 164 } 165 166 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 167 { 168 __be32 *p; 169 p = xdr_inline_decode(xdr, 4); 170 if (unlikely(p == NULL)) 171 return htonl(NFS4ERR_RESOURCE_HDR); 172 *op = ntohl(*p); 173 return 0; 174 } 175 176 static __be32 decode_getattr_args(struct svc_rqst *rqstp, 177 struct xdr_stream *xdr, void *argp) 178 { 179 struct cb_getattrargs *args = argp; 180 __be32 status; 181 182 status = decode_fh(xdr, &args->fh); 183 if (unlikely(status != 0)) 184 return status; 185 return decode_bitmap(xdr, args->bitmap); 186 } 187 188 static __be32 decode_recall_args(struct svc_rqst *rqstp, 189 struct xdr_stream *xdr, void *argp) 190 { 191 struct cb_recallargs *args = argp; 192 __be32 *p; 193 __be32 status; 194 195 status = decode_delegation_stateid(xdr, &args->stateid); 196 if (unlikely(status != 0)) 197 return status; 198 p = xdr_inline_decode(xdr, 4); 199 if (unlikely(p == NULL)) 200 return htonl(NFS4ERR_RESOURCE); 201 args->truncate = ntohl(*p); 202 return decode_fh(xdr, &args->fh); 203 } 204 205 #if defined(CONFIG_NFS_V4_1) 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 __be32 *p; 262 __be32 status = 0; 263 u32 tmp; 264 int n, i; 265 args->ndevs = 0; 266 267 /* Num of device notifications */ 268 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 269 if (unlikely(p == NULL)) { 270 status = htonl(NFS4ERR_BADXDR); 271 goto out; 272 } 273 n = ntohl(*p++); 274 if (n <= 0) 275 goto out; 276 if (n > ULONG_MAX / sizeof(*args->devs)) { 277 status = htonl(NFS4ERR_BADXDR); 278 goto out; 279 } 280 281 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL); 282 if (!args->devs) { 283 status = htonl(NFS4ERR_DELAY); 284 goto out; 285 } 286 287 /* Decode each dev notification */ 288 for (i = 0; i < n; i++) { 289 struct cb_devicenotifyitem *dev = &args->devs[i]; 290 291 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) + 292 NFS4_DEVICEID4_SIZE); 293 if (unlikely(p == NULL)) { 294 status = htonl(NFS4ERR_BADXDR); 295 goto err; 296 } 297 298 tmp = ntohl(*p++); /* bitmap size */ 299 if (tmp != 1) { 300 status = htonl(NFS4ERR_INVAL); 301 goto err; 302 } 303 dev->cbd_notify_type = ntohl(*p++); 304 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 305 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 306 status = htonl(NFS4ERR_INVAL); 307 goto err; 308 } 309 310 tmp = ntohl(*p++); /* opaque size */ 311 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 312 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 313 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 314 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 315 status = htonl(NFS4ERR_INVAL); 316 goto err; 317 } 318 dev->cbd_layout_type = ntohl(*p++); 319 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 320 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 321 322 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 323 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 324 if (unlikely(p == NULL)) { 325 status = htonl(NFS4ERR_BADXDR); 326 goto err; 327 } 328 dev->cbd_immediate = ntohl(*p++); 329 } else { 330 dev->cbd_immediate = 0; 331 } 332 333 args->ndevs++; 334 335 dprintk("%s: type %d layout 0x%x immediate %d\n", 336 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 337 dev->cbd_immediate); 338 } 339 out: 340 dprintk("%s: status %d ndevs %d\n", 341 __func__, ntohl(status), args->ndevs); 342 return status; 343 err: 344 kfree(args->devs); 345 goto out; 346 } 347 348 static __be32 decode_sessionid(struct xdr_stream *xdr, 349 struct nfs4_sessionid *sid) 350 { 351 __be32 *p; 352 353 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN); 354 if (unlikely(p == NULL)) 355 return htonl(NFS4ERR_RESOURCE); 356 357 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN); 358 return 0; 359 } 360 361 static __be32 decode_rc_list(struct xdr_stream *xdr, 362 struct referring_call_list *rc_list) 363 { 364 __be32 *p; 365 int i; 366 __be32 status; 367 368 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 369 if (status) 370 goto out; 371 372 status = htonl(NFS4ERR_RESOURCE); 373 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 374 if (unlikely(p == NULL)) 375 goto out; 376 377 rc_list->rcl_nrefcalls = ntohl(*p++); 378 if (rc_list->rcl_nrefcalls) { 379 p = xdr_inline_decode(xdr, 380 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 381 if (unlikely(p == NULL)) 382 goto out; 383 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls, 384 sizeof(*rc_list->rcl_refcalls), 385 GFP_KERNEL); 386 if (unlikely(rc_list->rcl_refcalls == NULL)) 387 goto out; 388 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 389 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 390 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 391 } 392 } 393 status = 0; 394 395 out: 396 return status; 397 } 398 399 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 400 struct xdr_stream *xdr, 401 void *argp) 402 { 403 struct cb_sequenceargs *args = argp; 404 __be32 *p; 405 int i; 406 __be32 status; 407 408 status = decode_sessionid(xdr, &args->csa_sessionid); 409 if (status) 410 return status; 411 412 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t)); 413 if (unlikely(p == NULL)) 414 return htonl(NFS4ERR_RESOURCE); 415 416 args->csa_addr = svc_addr(rqstp); 417 args->csa_sequenceid = ntohl(*p++); 418 args->csa_slotid = ntohl(*p++); 419 args->csa_highestslotid = ntohl(*p++); 420 args->csa_cachethis = ntohl(*p++); 421 args->csa_nrclists = ntohl(*p++); 422 args->csa_rclists = NULL; 423 if (args->csa_nrclists) { 424 args->csa_rclists = kmalloc_array(args->csa_nrclists, 425 sizeof(*args->csa_rclists), 426 GFP_KERNEL); 427 if (unlikely(args->csa_rclists == NULL)) 428 return htonl(NFS4ERR_RESOURCE); 429 430 for (i = 0; i < args->csa_nrclists; i++) { 431 status = decode_rc_list(xdr, &args->csa_rclists[i]); 432 if (status) { 433 args->csa_nrclists = i; 434 goto out_free; 435 } 436 } 437 } 438 return 0; 439 440 out_free: 441 for (i = 0; i < args->csa_nrclists; i++) 442 kfree(args->csa_rclists[i].rcl_refcalls); 443 kfree(args->csa_rclists); 444 return status; 445 } 446 447 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 448 struct xdr_stream *xdr, 449 void *argp) 450 { 451 struct cb_recallanyargs *args = argp; 452 uint32_t bitmap[2]; 453 __be32 *p, status; 454 455 p = xdr_inline_decode(xdr, 4); 456 if (unlikely(p == NULL)) 457 return htonl(NFS4ERR_BADXDR); 458 args->craa_objs_to_keep = ntohl(*p++); 459 status = decode_bitmap(xdr, bitmap); 460 if (unlikely(status)) 461 return status; 462 args->craa_type_mask = bitmap[0]; 463 464 return 0; 465 } 466 467 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 468 struct xdr_stream *xdr, 469 void *argp) 470 { 471 struct cb_recallslotargs *args = argp; 472 __be32 *p; 473 474 p = xdr_inline_decode(xdr, 4); 475 if (unlikely(p == NULL)) 476 return htonl(NFS4ERR_BADXDR); 477 args->crsa_target_highest_slotid = ntohl(*p++); 478 return 0; 479 } 480 481 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) 482 { 483 __be32 *p; 484 unsigned int len; 485 486 p = xdr_inline_decode(xdr, 12); 487 if (unlikely(p == NULL)) 488 return htonl(NFS4ERR_BADXDR); 489 490 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); 491 len = be32_to_cpu(*p); 492 493 p = xdr_inline_decode(xdr, len); 494 if (unlikely(p == NULL)) 495 return htonl(NFS4ERR_BADXDR); 496 497 /* Only try to decode if the length is right */ 498 if (len == 20) { 499 p += 2; /* skip "lock id:" */ 500 args->cbnl_owner.s_dev = be32_to_cpu(*p++); 501 xdr_decode_hyper(p, &args->cbnl_owner.id); 502 args->cbnl_valid = true; 503 } else { 504 args->cbnl_owner.s_dev = 0; 505 args->cbnl_owner.id = 0; 506 args->cbnl_valid = false; 507 } 508 return 0; 509 } 510 511 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, 512 struct xdr_stream *xdr, void *argp) 513 { 514 struct cb_notify_lock_args *args = argp; 515 __be32 status; 516 517 status = decode_fh(xdr, &args->cbnl_fh); 518 if (unlikely(status != 0)) 519 return status; 520 return decode_lockowner(xdr, args); 521 } 522 523 #endif /* CONFIG_NFS_V4_1 */ 524 #ifdef CONFIG_NFS_V4_2 525 static __be32 decode_write_response(struct xdr_stream *xdr, 526 struct cb_offloadargs *args) 527 { 528 __be32 *p; 529 530 /* skip the always zero field */ 531 p = xdr_inline_decode(xdr, 4); 532 if (unlikely(!p)) 533 goto out; 534 p++; 535 536 /* decode count, stable_how, verifier */ 537 p = xdr_inline_decode(xdr, 8 + 4); 538 if (unlikely(!p)) 539 goto out; 540 p = xdr_decode_hyper(p, &args->wr_count); 541 args->wr_writeverf.committed = be32_to_cpup(p); 542 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE); 543 if (likely(p)) { 544 memcpy(&args->wr_writeverf.verifier.data[0], p, 545 NFS4_VERIFIER_SIZE); 546 return 0; 547 } 548 out: 549 return htonl(NFS4ERR_RESOURCE); 550 } 551 552 static __be32 decode_offload_args(struct svc_rqst *rqstp, 553 struct xdr_stream *xdr, 554 void *data) 555 { 556 struct cb_offloadargs *args = data; 557 __be32 *p; 558 __be32 status; 559 560 /* decode fh */ 561 status = decode_fh(xdr, &args->coa_fh); 562 if (unlikely(status != 0)) 563 return status; 564 565 /* decode stateid */ 566 status = decode_stateid(xdr, &args->coa_stateid); 567 if (unlikely(status != 0)) 568 return status; 569 570 /* decode status */ 571 p = xdr_inline_decode(xdr, 4); 572 if (unlikely(!p)) 573 goto out; 574 args->error = ntohl(*p++); 575 if (!args->error) { 576 status = decode_write_response(xdr, args); 577 if (unlikely(status != 0)) 578 return status; 579 } else { 580 p = xdr_inline_decode(xdr, 8); 581 if (unlikely(!p)) 582 goto out; 583 p = xdr_decode_hyper(p, &args->wr_count); 584 } 585 return 0; 586 out: 587 return htonl(NFS4ERR_RESOURCE); 588 } 589 #endif /* CONFIG_NFS_V4_2 */ 590 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 591 { 592 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 593 return cpu_to_be32(NFS4ERR_RESOURCE); 594 return 0; 595 } 596 597 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz) 598 { 599 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0) 600 return cpu_to_be32(NFS4ERR_RESOURCE); 601 return 0; 602 } 603 604 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 605 { 606 __be32 *p; 607 608 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 609 return 0; 610 p = xdr_reserve_space(xdr, 8); 611 if (unlikely(!p)) 612 return htonl(NFS4ERR_RESOURCE); 613 p = xdr_encode_hyper(p, change); 614 return 0; 615 } 616 617 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 618 { 619 __be32 *p; 620 621 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 622 return 0; 623 p = xdr_reserve_space(xdr, 8); 624 if (unlikely(!p)) 625 return htonl(NFS4ERR_RESOURCE); 626 p = xdr_encode_hyper(p, size); 627 return 0; 628 } 629 630 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time) 631 { 632 __be32 *p; 633 634 p = xdr_reserve_space(xdr, 12); 635 if (unlikely(!p)) 636 return htonl(NFS4ERR_RESOURCE); 637 p = xdr_encode_hyper(p, time->tv_sec); 638 *p = htonl(time->tv_nsec); 639 return 0; 640 } 641 642 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 643 { 644 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 645 return 0; 646 return encode_attr_time(xdr,time); 647 } 648 649 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 650 { 651 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 652 return 0; 653 return encode_attr_time(xdr,time); 654 } 655 656 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 657 { 658 __be32 status; 659 660 hdr->status = xdr_reserve_space(xdr, 4); 661 if (unlikely(hdr->status == NULL)) 662 return htonl(NFS4ERR_RESOURCE); 663 status = encode_string(xdr, hdr->taglen, hdr->tag); 664 if (unlikely(status != 0)) 665 return status; 666 hdr->nops = xdr_reserve_space(xdr, 4); 667 if (unlikely(hdr->nops == NULL)) 668 return htonl(NFS4ERR_RESOURCE); 669 return 0; 670 } 671 672 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 673 { 674 __be32 *p; 675 676 p = xdr_reserve_space(xdr, 8); 677 if (unlikely(p == NULL)) 678 return htonl(NFS4ERR_RESOURCE_HDR); 679 *p++ = htonl(op); 680 *p = res; 681 return 0; 682 } 683 684 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, 685 const void *resp) 686 { 687 const struct cb_getattrres *res = resp; 688 __be32 *savep = NULL; 689 __be32 status = res->status; 690 691 if (unlikely(status != 0)) 692 goto out; 693 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap)); 694 if (unlikely(status != 0)) 695 goto out; 696 status = cpu_to_be32(NFS4ERR_RESOURCE); 697 savep = xdr_reserve_space(xdr, sizeof(*savep)); 698 if (unlikely(!savep)) 699 goto out; 700 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 701 if (unlikely(status != 0)) 702 goto out; 703 status = encode_attr_size(xdr, res->bitmap, res->size); 704 if (unlikely(status != 0)) 705 goto out; 706 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 707 if (unlikely(status != 0)) 708 goto out; 709 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 710 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 711 out: 712 return status; 713 } 714 715 #if defined(CONFIG_NFS_V4_1) 716 717 static __be32 encode_sessionid(struct xdr_stream *xdr, 718 const struct nfs4_sessionid *sid) 719 { 720 __be32 *p; 721 722 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 723 if (unlikely(p == NULL)) 724 return htonl(NFS4ERR_RESOURCE); 725 726 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 727 return 0; 728 } 729 730 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 731 struct xdr_stream *xdr, 732 const void *resp) 733 { 734 const struct cb_sequenceres *res = resp; 735 __be32 *p; 736 __be32 status = res->csr_status; 737 738 if (unlikely(status != 0)) 739 return status; 740 741 status = encode_sessionid(xdr, &res->csr_sessionid); 742 if (status) 743 return status; 744 745 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 746 if (unlikely(p == NULL)) 747 return htonl(NFS4ERR_RESOURCE); 748 749 *p++ = htonl(res->csr_sequenceid); 750 *p++ = htonl(res->csr_slotid); 751 *p++ = htonl(res->csr_highestslotid); 752 *p++ = htonl(res->csr_target_highestslotid); 753 return 0; 754 } 755 756 static __be32 757 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 758 { 759 if (op_nr == OP_CB_SEQUENCE) { 760 if (nop != 0) 761 return htonl(NFS4ERR_SEQUENCE_POS); 762 } else { 763 if (nop == 0) 764 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 765 } 766 767 switch (op_nr) { 768 case OP_CB_GETATTR: 769 case OP_CB_RECALL: 770 case OP_CB_SEQUENCE: 771 case OP_CB_RECALL_ANY: 772 case OP_CB_RECALL_SLOT: 773 case OP_CB_LAYOUTRECALL: 774 case OP_CB_NOTIFY_DEVICEID: 775 case OP_CB_NOTIFY_LOCK: 776 *op = &callback_ops[op_nr]; 777 break; 778 779 case OP_CB_NOTIFY: 780 case OP_CB_PUSH_DELEG: 781 case OP_CB_RECALLABLE_OBJ_AVAIL: 782 case OP_CB_WANTS_CANCELLED: 783 return htonl(NFS4ERR_NOTSUPP); 784 785 default: 786 return htonl(NFS4ERR_OP_ILLEGAL); 787 } 788 789 return htonl(NFS_OK); 790 } 791 792 static void nfs4_callback_free_slot(struct nfs4_session *session, 793 struct nfs4_slot *slot) 794 { 795 struct nfs4_slot_table *tbl = &session->bc_slot_table; 796 797 spin_lock(&tbl->slot_tbl_lock); 798 /* 799 * Let the state manager know callback processing done. 800 * A single slot, so highest used slotid is either 0 or -1 801 */ 802 nfs4_free_slot(tbl, slot); 803 spin_unlock(&tbl->slot_tbl_lock); 804 } 805 806 static void nfs4_cb_free_slot(struct cb_process_state *cps) 807 { 808 if (cps->slot) { 809 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 810 cps->slot = NULL; 811 } 812 } 813 814 #else /* CONFIG_NFS_V4_1 */ 815 816 static __be32 817 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 818 { 819 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 820 } 821 822 static void nfs4_cb_free_slot(struct cb_process_state *cps) 823 { 824 } 825 #endif /* CONFIG_NFS_V4_1 */ 826 827 #ifdef CONFIG_NFS_V4_2 828 static __be32 829 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 830 { 831 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 832 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 833 return status; 834 835 if (op_nr == OP_CB_OFFLOAD) { 836 *op = &callback_ops[op_nr]; 837 return htonl(NFS_OK); 838 } else 839 return htonl(NFS4ERR_NOTSUPP); 840 return htonl(NFS4ERR_OP_ILLEGAL); 841 } 842 #else /* CONFIG_NFS_V4_2 */ 843 static __be32 844 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 845 { 846 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 847 } 848 #endif /* CONFIG_NFS_V4_2 */ 849 850 static __be32 851 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 852 { 853 switch (op_nr) { 854 case OP_CB_GETATTR: 855 case OP_CB_RECALL: 856 *op = &callback_ops[op_nr]; 857 break; 858 default: 859 return htonl(NFS4ERR_OP_ILLEGAL); 860 } 861 862 return htonl(NFS_OK); 863 } 864 865 static __be32 process_op(int nop, struct svc_rqst *rqstp, 866 struct cb_process_state *cps) 867 { 868 struct xdr_stream *xdr_out = &rqstp->rq_res_stream; 869 struct callback_op *op = &callback_ops[0]; 870 unsigned int op_nr; 871 __be32 status; 872 long maxlen; 873 __be32 res; 874 875 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr); 876 if (unlikely(status)) 877 return status; 878 879 switch (cps->minorversion) { 880 case 0: 881 status = preprocess_nfs4_op(op_nr, &op); 882 break; 883 case 1: 884 status = preprocess_nfs41_op(nop, op_nr, &op); 885 break; 886 case 2: 887 status = preprocess_nfs42_op(nop, op_nr, &op); 888 break; 889 default: 890 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 891 } 892 893 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 894 op_nr = OP_CB_ILLEGAL; 895 if (status) 896 goto encode_hdr; 897 898 if (cps->drc_status) { 899 status = cps->drc_status; 900 goto encode_hdr; 901 } 902 903 maxlen = xdr_out->end - xdr_out->p; 904 if (maxlen > 0 && maxlen < PAGE_SIZE) { 905 status = op->decode_args(rqstp, &rqstp->rq_arg_stream, 906 rqstp->rq_argp); 907 if (likely(status == 0)) 908 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp, 909 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, rqstp->rq_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 cb_process_state cps = { 930 .drc_status = 0, 931 .clp = NULL, 932 .net = SVC_NET(rqstp), 933 }; 934 unsigned int nops = 0; 935 __be32 status; 936 937 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg); 938 if (status == htonl(NFS4ERR_RESOURCE)) 939 return rpc_garbage_args; 940 941 if (hdr_arg.minorversion == 0) { 942 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 943 if (!cps.clp) { 944 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident); 945 goto out_invalidcred; 946 } 947 if (!check_gss_callback_principal(cps.clp, rqstp)) { 948 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident); 949 nfs_put_client(cps.clp); 950 goto out_invalidcred; 951 } 952 } 953 954 cps.minorversion = hdr_arg.minorversion; 955 hdr_res.taglen = hdr_arg.taglen; 956 hdr_res.tag = hdr_arg.tag; 957 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) { 958 if (cps.clp) 959 nfs_put_client(cps.clp); 960 return rpc_system_err; 961 } 962 while (status == 0 && nops != hdr_arg.nops) { 963 status = process_op(nops, rqstp, &cps); 964 nops++; 965 } 966 967 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 968 * resource error in cb_compound status without returning op */ 969 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 970 status = htonl(NFS4ERR_RESOURCE); 971 nops--; 972 } 973 974 *hdr_res.status = status; 975 *hdr_res.nops = htonl(nops); 976 nfs4_cb_free_slot(&cps); 977 nfs_put_client(cps.clp); 978 return rpc_success; 979 980 out_invalidcred: 981 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 982 rqstp->rq_auth_stat = rpc_autherr_badcred; 983 return rpc_success; 984 } 985 986 static int 987 nfs_callback_dispatch(struct svc_rqst *rqstp, __be32 *statp) 988 { 989 const struct svc_procedure *procp = rqstp->rq_procinfo; 990 991 svcxdr_init_decode(rqstp); 992 svcxdr_init_encode(rqstp); 993 994 *statp = procp->pc_func(rqstp); 995 return 1; 996 } 997 998 /* 999 * Define NFS4 callback COMPOUND ops. 1000 */ 1001 static struct callback_op callback_ops[] = { 1002 [0] = { 1003 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 1004 }, 1005 [OP_CB_GETATTR] = { 1006 .process_op = nfs4_callback_getattr, 1007 .decode_args = decode_getattr_args, 1008 .encode_res = encode_getattr_res, 1009 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 1010 }, 1011 [OP_CB_RECALL] = { 1012 .process_op = nfs4_callback_recall, 1013 .decode_args = decode_recall_args, 1014 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 1015 }, 1016 #if defined(CONFIG_NFS_V4_1) 1017 [OP_CB_LAYOUTRECALL] = { 1018 .process_op = nfs4_callback_layoutrecall, 1019 .decode_args = decode_layoutrecall_args, 1020 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 1021 }, 1022 [OP_CB_NOTIFY_DEVICEID] = { 1023 .process_op = nfs4_callback_devicenotify, 1024 .decode_args = decode_devicenotify_args, 1025 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 1026 }, 1027 [OP_CB_SEQUENCE] = { 1028 .process_op = nfs4_callback_sequence, 1029 .decode_args = decode_cb_sequence_args, 1030 .encode_res = encode_cb_sequence_res, 1031 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 1032 }, 1033 [OP_CB_RECALL_ANY] = { 1034 .process_op = nfs4_callback_recallany, 1035 .decode_args = decode_recallany_args, 1036 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 1037 }, 1038 [OP_CB_RECALL_SLOT] = { 1039 .process_op = nfs4_callback_recallslot, 1040 .decode_args = decode_recallslot_args, 1041 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 1042 }, 1043 [OP_CB_NOTIFY_LOCK] = { 1044 .process_op = nfs4_callback_notify_lock, 1045 .decode_args = decode_notify_lock_args, 1046 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 1047 }, 1048 #endif /* CONFIG_NFS_V4_1 */ 1049 #ifdef CONFIG_NFS_V4_2 1050 [OP_CB_OFFLOAD] = { 1051 .process_op = nfs4_callback_offload, 1052 .decode_args = decode_offload_args, 1053 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ, 1054 }, 1055 #endif /* CONFIG_NFS_V4_2 */ 1056 }; 1057 1058 /* 1059 * Define NFS4 callback procedures 1060 */ 1061 static const struct svc_procedure nfs4_callback_procedures1[] = { 1062 [CB_NULL] = { 1063 .pc_func = nfs4_callback_null, 1064 .pc_encode = nfs4_encode_void, 1065 .pc_xdrressize = 1, 1066 .pc_name = "NULL", 1067 }, 1068 [CB_COMPOUND] = { 1069 .pc_func = nfs4_callback_compound, 1070 .pc_encode = nfs4_encode_void, 1071 .pc_argsize = 256, 1072 .pc_ressize = 256, 1073 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1074 .pc_name = "COMPOUND", 1075 } 1076 }; 1077 1078 static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]; 1079 const struct svc_version nfs4_callback_version1 = { 1080 .vs_vers = 1, 1081 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1082 .vs_proc = nfs4_callback_procedures1, 1083 .vs_count = nfs4_callback_count1, 1084 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1085 .vs_dispatch = nfs_callback_dispatch, 1086 .vs_hidden = true, 1087 .vs_need_cong_ctrl = true, 1088 }; 1089 1090 static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]; 1091 const struct svc_version nfs4_callback_version4 = { 1092 .vs_vers = 4, 1093 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1094 .vs_proc = nfs4_callback_procedures1, 1095 .vs_count = nfs4_callback_count4, 1096 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1097 .vs_dispatch = nfs_callback_dispatch, 1098 .vs_hidden = true, 1099 .vs_need_cong_ctrl = true, 1100 }; 1101