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 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[2]; 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 #endif /* CONFIG_NFS_V4_1 */ 522 #ifdef CONFIG_NFS_V4_2 523 static __be32 decode_write_response(struct xdr_stream *xdr, 524 struct cb_offloadargs *args) 525 { 526 __be32 *p; 527 528 /* skip the always zero field */ 529 p = xdr_inline_decode(xdr, 4); 530 if (unlikely(!p)) 531 goto out; 532 p++; 533 534 /* decode count, stable_how, verifier */ 535 p = xdr_inline_decode(xdr, 8 + 4); 536 if (unlikely(!p)) 537 goto out; 538 p = xdr_decode_hyper(p, &args->wr_count); 539 args->wr_writeverf.committed = be32_to_cpup(p); 540 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE); 541 if (likely(p)) { 542 memcpy(&args->wr_writeverf.verifier.data[0], p, 543 NFS4_VERIFIER_SIZE); 544 return 0; 545 } 546 out: 547 return htonl(NFS4ERR_RESOURCE); 548 } 549 550 static __be32 decode_offload_args(struct svc_rqst *rqstp, 551 struct xdr_stream *xdr, 552 void *data) 553 { 554 struct cb_offloadargs *args = data; 555 __be32 *p; 556 __be32 status; 557 558 /* decode fh */ 559 status = decode_fh(xdr, &args->coa_fh); 560 if (unlikely(status != 0)) 561 return status; 562 563 /* decode stateid */ 564 status = decode_stateid(xdr, &args->coa_stateid); 565 if (unlikely(status != 0)) 566 return status; 567 568 /* decode status */ 569 p = xdr_inline_decode(xdr, 4); 570 if (unlikely(!p)) 571 goto out; 572 args->error = ntohl(*p++); 573 if (!args->error) { 574 status = decode_write_response(xdr, args); 575 if (unlikely(status != 0)) 576 return status; 577 } else { 578 p = xdr_inline_decode(xdr, 8); 579 if (unlikely(!p)) 580 goto out; 581 p = xdr_decode_hyper(p, &args->wr_count); 582 } 583 return 0; 584 out: 585 return htonl(NFS4ERR_RESOURCE); 586 } 587 #endif /* CONFIG_NFS_V4_2 */ 588 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 589 { 590 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 591 return cpu_to_be32(NFS4ERR_RESOURCE); 592 return 0; 593 } 594 595 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz) 596 { 597 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0) 598 return cpu_to_be32(NFS4ERR_RESOURCE); 599 return 0; 600 } 601 602 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 603 { 604 __be32 *p; 605 606 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 607 return 0; 608 p = xdr_reserve_space(xdr, 8); 609 if (unlikely(!p)) 610 return htonl(NFS4ERR_RESOURCE); 611 p = xdr_encode_hyper(p, change); 612 return 0; 613 } 614 615 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 616 { 617 __be32 *p; 618 619 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 620 return 0; 621 p = xdr_reserve_space(xdr, 8); 622 if (unlikely(!p)) 623 return htonl(NFS4ERR_RESOURCE); 624 p = xdr_encode_hyper(p, size); 625 return 0; 626 } 627 628 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time) 629 { 630 __be32 *p; 631 632 p = xdr_reserve_space(xdr, 12); 633 if (unlikely(!p)) 634 return htonl(NFS4ERR_RESOURCE); 635 p = xdr_encode_hyper(p, time->tv_sec); 636 *p = htonl(time->tv_nsec); 637 return 0; 638 } 639 640 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 641 { 642 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 643 return 0; 644 return encode_attr_time(xdr,time); 645 } 646 647 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 648 { 649 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 650 return 0; 651 return encode_attr_time(xdr,time); 652 } 653 654 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 655 { 656 __be32 status; 657 658 hdr->status = xdr_reserve_space(xdr, 4); 659 if (unlikely(hdr->status == NULL)) 660 return htonl(NFS4ERR_RESOURCE); 661 status = encode_string(xdr, hdr->taglen, hdr->tag); 662 if (unlikely(status != 0)) 663 return status; 664 hdr->nops = xdr_reserve_space(xdr, 4); 665 if (unlikely(hdr->nops == NULL)) 666 return htonl(NFS4ERR_RESOURCE); 667 return 0; 668 } 669 670 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 671 { 672 __be32 *p; 673 674 p = xdr_reserve_space(xdr, 8); 675 if (unlikely(p == NULL)) 676 return htonl(NFS4ERR_RESOURCE_HDR); 677 *p++ = htonl(op); 678 *p = res; 679 return 0; 680 } 681 682 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, 683 const void *resp) 684 { 685 const struct cb_getattrres *res = resp; 686 __be32 *savep = NULL; 687 __be32 status = res->status; 688 689 if (unlikely(status != 0)) 690 goto out; 691 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap)); 692 if (unlikely(status != 0)) 693 goto out; 694 status = cpu_to_be32(NFS4ERR_RESOURCE); 695 savep = xdr_reserve_space(xdr, sizeof(*savep)); 696 if (unlikely(!savep)) 697 goto out; 698 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 699 if (unlikely(status != 0)) 700 goto out; 701 status = encode_attr_size(xdr, res->bitmap, res->size); 702 if (unlikely(status != 0)) 703 goto out; 704 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 705 if (unlikely(status != 0)) 706 goto out; 707 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 708 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 709 out: 710 return status; 711 } 712 713 #if defined(CONFIG_NFS_V4_1) 714 715 static __be32 encode_sessionid(struct xdr_stream *xdr, 716 const struct nfs4_sessionid *sid) 717 { 718 __be32 *p; 719 720 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 721 if (unlikely(p == NULL)) 722 return htonl(NFS4ERR_RESOURCE); 723 724 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 725 return 0; 726 } 727 728 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 729 struct xdr_stream *xdr, 730 const void *resp) 731 { 732 const struct cb_sequenceres *res = resp; 733 __be32 *p; 734 __be32 status = res->csr_status; 735 736 if (unlikely(status != 0)) 737 return status; 738 739 status = encode_sessionid(xdr, &res->csr_sessionid); 740 if (status) 741 return status; 742 743 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 744 if (unlikely(p == NULL)) 745 return htonl(NFS4ERR_RESOURCE); 746 747 *p++ = htonl(res->csr_sequenceid); 748 *p++ = htonl(res->csr_slotid); 749 *p++ = htonl(res->csr_highestslotid); 750 *p++ = htonl(res->csr_target_highestslotid); 751 return 0; 752 } 753 754 static __be32 755 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 756 { 757 if (op_nr == OP_CB_SEQUENCE) { 758 if (nop != 0) 759 return htonl(NFS4ERR_SEQUENCE_POS); 760 } else { 761 if (nop == 0) 762 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 763 } 764 765 switch (op_nr) { 766 case OP_CB_GETATTR: 767 case OP_CB_RECALL: 768 case OP_CB_SEQUENCE: 769 case OP_CB_RECALL_ANY: 770 case OP_CB_RECALL_SLOT: 771 case OP_CB_LAYOUTRECALL: 772 case OP_CB_NOTIFY_DEVICEID: 773 case OP_CB_NOTIFY_LOCK: 774 *op = &callback_ops[op_nr]; 775 break; 776 777 case OP_CB_NOTIFY: 778 case OP_CB_PUSH_DELEG: 779 case OP_CB_RECALLABLE_OBJ_AVAIL: 780 case OP_CB_WANTS_CANCELLED: 781 return htonl(NFS4ERR_NOTSUPP); 782 783 default: 784 return htonl(NFS4ERR_OP_ILLEGAL); 785 } 786 787 return htonl(NFS_OK); 788 } 789 790 static void nfs4_callback_free_slot(struct nfs4_session *session, 791 struct nfs4_slot *slot) 792 { 793 struct nfs4_slot_table *tbl = &session->bc_slot_table; 794 795 spin_lock(&tbl->slot_tbl_lock); 796 /* 797 * Let the state manager know callback processing done. 798 * A single slot, so highest used slotid is either 0 or -1 799 */ 800 nfs4_free_slot(tbl, slot); 801 spin_unlock(&tbl->slot_tbl_lock); 802 } 803 804 static void nfs4_cb_free_slot(struct cb_process_state *cps) 805 { 806 if (cps->slot) { 807 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 808 cps->slot = NULL; 809 } 810 } 811 812 #else /* CONFIG_NFS_V4_1 */ 813 814 static __be32 815 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 816 { 817 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 818 } 819 820 static void nfs4_cb_free_slot(struct cb_process_state *cps) 821 { 822 } 823 #endif /* CONFIG_NFS_V4_1 */ 824 825 #ifdef CONFIG_NFS_V4_2 826 static __be32 827 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 828 { 829 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 830 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 831 return status; 832 833 if (op_nr == OP_CB_OFFLOAD) { 834 *op = &callback_ops[op_nr]; 835 return htonl(NFS_OK); 836 } else 837 return htonl(NFS4ERR_NOTSUPP); 838 return htonl(NFS4ERR_OP_ILLEGAL); 839 } 840 #else /* CONFIG_NFS_V4_2 */ 841 static __be32 842 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 843 { 844 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 845 } 846 #endif /* CONFIG_NFS_V4_2 */ 847 848 static __be32 849 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 850 { 851 switch (op_nr) { 852 case OP_CB_GETATTR: 853 case OP_CB_RECALL: 854 *op = &callback_ops[op_nr]; 855 break; 856 default: 857 return htonl(NFS4ERR_OP_ILLEGAL); 858 } 859 860 return htonl(NFS_OK); 861 } 862 863 static __be32 process_op(int nop, struct svc_rqst *rqstp, 864 struct cb_process_state *cps) 865 { 866 struct xdr_stream *xdr_out = &rqstp->rq_res_stream; 867 struct callback_op *op = &callback_ops[0]; 868 unsigned int op_nr; 869 __be32 status; 870 long maxlen; 871 __be32 res; 872 873 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr); 874 if (unlikely(status)) 875 return status; 876 877 switch (cps->minorversion) { 878 case 0: 879 status = preprocess_nfs4_op(op_nr, &op); 880 break; 881 case 1: 882 status = preprocess_nfs41_op(nop, op_nr, &op); 883 break; 884 case 2: 885 status = preprocess_nfs42_op(nop, op_nr, &op); 886 break; 887 default: 888 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 889 } 890 891 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 892 op_nr = OP_CB_ILLEGAL; 893 if (status) 894 goto encode_hdr; 895 896 if (cps->drc_status) { 897 status = cps->drc_status; 898 goto encode_hdr; 899 } 900 901 maxlen = xdr_out->end - xdr_out->p; 902 if (maxlen > 0 && maxlen < PAGE_SIZE) { 903 status = op->decode_args(rqstp, &rqstp->rq_arg_stream, 904 rqstp->rq_argp); 905 if (likely(status == 0)) 906 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp, 907 cps); 908 } else 909 status = htonl(NFS4ERR_RESOURCE); 910 911 encode_hdr: 912 res = encode_op_hdr(xdr_out, op_nr, status); 913 if (unlikely(res)) 914 return res; 915 if (op->encode_res != NULL && status == 0) 916 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp); 917 return status; 918 } 919 920 /* 921 * Decode, process and encode a COMPOUND 922 */ 923 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp) 924 { 925 struct cb_compound_hdr_arg hdr_arg = { 0 }; 926 struct cb_compound_hdr_res hdr_res = { NULL }; 927 struct cb_process_state cps = { 928 .drc_status = 0, 929 .clp = NULL, 930 .net = SVC_NET(rqstp), 931 }; 932 unsigned int nops = 0; 933 __be32 status; 934 935 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg); 936 if (status == htonl(NFS4ERR_RESOURCE)) 937 return rpc_garbage_args; 938 939 if (hdr_arg.minorversion == 0) { 940 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 941 if (!cps.clp) { 942 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident); 943 goto out_invalidcred; 944 } 945 if (!check_gss_callback_principal(cps.clp, rqstp)) { 946 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident); 947 nfs_put_client(cps.clp); 948 goto out_invalidcred; 949 } 950 } 951 952 cps.minorversion = hdr_arg.minorversion; 953 hdr_res.taglen = hdr_arg.taglen; 954 hdr_res.tag = hdr_arg.tag; 955 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) { 956 if (cps.clp) 957 nfs_put_client(cps.clp); 958 return rpc_system_err; 959 } 960 while (status == 0 && nops != hdr_arg.nops) { 961 status = process_op(nops, rqstp, &cps); 962 nops++; 963 } 964 965 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 966 * resource error in cb_compound status without returning op */ 967 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 968 status = htonl(NFS4ERR_RESOURCE); 969 nops--; 970 } 971 972 *hdr_res.status = status; 973 *hdr_res.nops = htonl(nops); 974 nfs4_cb_free_slot(&cps); 975 nfs_put_client(cps.clp); 976 return rpc_success; 977 978 out_invalidcred: 979 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 980 rqstp->rq_auth_stat = rpc_autherr_badcred; 981 return rpc_success; 982 } 983 984 static int 985 nfs_callback_dispatch(struct svc_rqst *rqstp) 986 { 987 const struct svc_procedure *procp = rqstp->rq_procinfo; 988 989 *rqstp->rq_accept_statp = procp->pc_func(rqstp); 990 return 1; 991 } 992 993 /* 994 * Define NFS4 callback COMPOUND ops. 995 */ 996 static struct callback_op callback_ops[] = { 997 [0] = { 998 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 999 }, 1000 [OP_CB_GETATTR] = { 1001 .process_op = nfs4_callback_getattr, 1002 .decode_args = decode_getattr_args, 1003 .encode_res = encode_getattr_res, 1004 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 1005 }, 1006 [OP_CB_RECALL] = { 1007 .process_op = nfs4_callback_recall, 1008 .decode_args = decode_recall_args, 1009 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 1010 }, 1011 #if defined(CONFIG_NFS_V4_1) 1012 [OP_CB_LAYOUTRECALL] = { 1013 .process_op = nfs4_callback_layoutrecall, 1014 .decode_args = decode_layoutrecall_args, 1015 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 1016 }, 1017 [OP_CB_NOTIFY_DEVICEID] = { 1018 .process_op = nfs4_callback_devicenotify, 1019 .decode_args = decode_devicenotify_args, 1020 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 1021 }, 1022 [OP_CB_SEQUENCE] = { 1023 .process_op = nfs4_callback_sequence, 1024 .decode_args = decode_cb_sequence_args, 1025 .encode_res = encode_cb_sequence_res, 1026 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 1027 }, 1028 [OP_CB_RECALL_ANY] = { 1029 .process_op = nfs4_callback_recallany, 1030 .decode_args = decode_recallany_args, 1031 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 1032 }, 1033 [OP_CB_RECALL_SLOT] = { 1034 .process_op = nfs4_callback_recallslot, 1035 .decode_args = decode_recallslot_args, 1036 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 1037 }, 1038 [OP_CB_NOTIFY_LOCK] = { 1039 .process_op = nfs4_callback_notify_lock, 1040 .decode_args = decode_notify_lock_args, 1041 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 1042 }, 1043 #endif /* CONFIG_NFS_V4_1 */ 1044 #ifdef CONFIG_NFS_V4_2 1045 [OP_CB_OFFLOAD] = { 1046 .process_op = nfs4_callback_offload, 1047 .decode_args = decode_offload_args, 1048 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ, 1049 }, 1050 #endif /* CONFIG_NFS_V4_2 */ 1051 }; 1052 1053 /* 1054 * Define NFS4 callback procedures 1055 */ 1056 static const struct svc_procedure nfs4_callback_procedures1[] = { 1057 [CB_NULL] = { 1058 .pc_func = nfs4_callback_null, 1059 .pc_encode = nfs4_encode_void, 1060 .pc_xdrressize = 1, 1061 .pc_name = "NULL", 1062 }, 1063 [CB_COMPOUND] = { 1064 .pc_func = nfs4_callback_compound, 1065 .pc_encode = nfs4_encode_void, 1066 .pc_argsize = 256, 1067 .pc_argzero = 256, 1068 .pc_ressize = 256, 1069 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1070 .pc_name = "COMPOUND", 1071 } 1072 }; 1073 1074 static DEFINE_PER_CPU_ALIGNED(unsigned long, 1075 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 = nfs_callback_dispatch, 1083 .vs_hidden = true, 1084 .vs_need_cong_ctrl = true, 1085 }; 1086 1087 static DEFINE_PER_CPU_ALIGNED(unsigned long, 1088 nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]); 1089 const struct svc_version nfs4_callback_version4 = { 1090 .vs_vers = 4, 1091 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1092 .vs_proc = nfs4_callback_procedures1, 1093 .vs_count = nfs4_callback_count4, 1094 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1095 .vs_dispatch = nfs_callback_dispatch, 1096 .vs_hidden = true, 1097 .vs_need_cong_ctrl = true, 1098 }; 1099