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 p = xdr_inline_decode(xdr, 376 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 377 if (unlikely(p == NULL)) 378 goto out; 379 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls, 380 sizeof(*rc_list->rcl_refcalls), 381 GFP_KERNEL); 382 if (unlikely(rc_list->rcl_refcalls == NULL)) 383 goto out; 384 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 385 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 386 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 387 } 388 } 389 status = 0; 390 391 out: 392 return status; 393 } 394 395 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 396 struct xdr_stream *xdr, 397 void *argp) 398 { 399 struct cb_sequenceargs *args = argp; 400 __be32 *p; 401 int i; 402 __be32 status; 403 404 status = decode_sessionid(xdr, &args->csa_sessionid); 405 if (status) 406 return status; 407 408 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t)); 409 if (unlikely(p == NULL)) 410 return htonl(NFS4ERR_RESOURCE); 411 412 args->csa_addr = svc_addr(rqstp); 413 args->csa_sequenceid = ntohl(*p++); 414 args->csa_slotid = ntohl(*p++); 415 args->csa_highestslotid = ntohl(*p++); 416 args->csa_cachethis = ntohl(*p++); 417 args->csa_nrclists = ntohl(*p++); 418 args->csa_rclists = NULL; 419 if (args->csa_nrclists) { 420 args->csa_rclists = kmalloc_array(args->csa_nrclists, 421 sizeof(*args->csa_rclists), 422 GFP_KERNEL); 423 if (unlikely(args->csa_rclists == NULL)) 424 return htonl(NFS4ERR_RESOURCE); 425 426 for (i = 0; i < args->csa_nrclists; i++) { 427 status = decode_rc_list(xdr, &args->csa_rclists[i]); 428 if (status) { 429 args->csa_nrclists = i; 430 goto out_free; 431 } 432 } 433 } 434 return 0; 435 436 out_free: 437 for (i = 0; i < args->csa_nrclists; i++) 438 kfree(args->csa_rclists[i].rcl_refcalls); 439 kfree(args->csa_rclists); 440 return status; 441 } 442 443 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 444 struct xdr_stream *xdr, 445 void *argp) 446 { 447 struct cb_recallanyargs *args = argp; 448 uint32_t bitmap[2]; 449 __be32 *p, status; 450 451 p = xdr_inline_decode(xdr, 4); 452 if (unlikely(p == NULL)) 453 return htonl(NFS4ERR_BADXDR); 454 args->craa_objs_to_keep = ntohl(*p++); 455 status = decode_bitmap(xdr, bitmap); 456 if (unlikely(status)) 457 return status; 458 args->craa_type_mask = bitmap[0]; 459 460 return 0; 461 } 462 463 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 464 struct xdr_stream *xdr, 465 void *argp) 466 { 467 struct cb_recallslotargs *args = argp; 468 __be32 *p; 469 470 p = xdr_inline_decode(xdr, 4); 471 if (unlikely(p == NULL)) 472 return htonl(NFS4ERR_BADXDR); 473 args->crsa_target_highest_slotid = ntohl(*p++); 474 return 0; 475 } 476 477 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) 478 { 479 __be32 *p; 480 unsigned int len; 481 482 p = xdr_inline_decode(xdr, 12); 483 if (unlikely(p == NULL)) 484 return htonl(NFS4ERR_BADXDR); 485 486 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); 487 len = be32_to_cpu(*p); 488 489 p = xdr_inline_decode(xdr, len); 490 if (unlikely(p == NULL)) 491 return htonl(NFS4ERR_BADXDR); 492 493 /* Only try to decode if the length is right */ 494 if (len == 20) { 495 p += 2; /* skip "lock id:" */ 496 args->cbnl_owner.s_dev = be32_to_cpu(*p++); 497 xdr_decode_hyper(p, &args->cbnl_owner.id); 498 args->cbnl_valid = true; 499 } else { 500 args->cbnl_owner.s_dev = 0; 501 args->cbnl_owner.id = 0; 502 args->cbnl_valid = false; 503 } 504 return 0; 505 } 506 507 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, 508 struct xdr_stream *xdr, void *argp) 509 { 510 struct cb_notify_lock_args *args = argp; 511 __be32 status; 512 513 status = decode_fh(xdr, &args->cbnl_fh); 514 if (unlikely(status != 0)) 515 return status; 516 return decode_lockowner(xdr, args); 517 } 518 519 #endif /* CONFIG_NFS_V4_1 */ 520 #ifdef CONFIG_NFS_V4_2 521 static __be32 decode_write_response(struct xdr_stream *xdr, 522 struct cb_offloadargs *args) 523 { 524 __be32 *p; 525 526 /* skip the always zero field */ 527 p = xdr_inline_decode(xdr, 4); 528 if (unlikely(!p)) 529 goto out; 530 p++; 531 532 /* decode count, stable_how, verifier */ 533 p = xdr_inline_decode(xdr, 8 + 4); 534 if (unlikely(!p)) 535 goto out; 536 p = xdr_decode_hyper(p, &args->wr_count); 537 args->wr_writeverf.committed = be32_to_cpup(p); 538 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE); 539 if (likely(p)) { 540 memcpy(&args->wr_writeverf.verifier.data[0], p, 541 NFS4_VERIFIER_SIZE); 542 return 0; 543 } 544 out: 545 return htonl(NFS4ERR_RESOURCE); 546 } 547 548 static __be32 decode_offload_args(struct svc_rqst *rqstp, 549 struct xdr_stream *xdr, 550 void *data) 551 { 552 struct cb_offloadargs *args = data; 553 __be32 *p; 554 __be32 status; 555 556 /* decode fh */ 557 status = decode_fh(xdr, &args->coa_fh); 558 if (unlikely(status != 0)) 559 return status; 560 561 /* decode stateid */ 562 status = decode_stateid(xdr, &args->coa_stateid); 563 if (unlikely(status != 0)) 564 return status; 565 566 /* decode status */ 567 p = xdr_inline_decode(xdr, 4); 568 if (unlikely(!p)) 569 goto out; 570 args->error = ntohl(*p++); 571 if (!args->error) { 572 status = decode_write_response(xdr, args); 573 if (unlikely(status != 0)) 574 return status; 575 } else { 576 p = xdr_inline_decode(xdr, 8); 577 if (unlikely(!p)) 578 goto out; 579 p = xdr_decode_hyper(p, &args->wr_count); 580 } 581 return 0; 582 out: 583 return htonl(NFS4ERR_RESOURCE); 584 } 585 #endif /* CONFIG_NFS_V4_2 */ 586 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 587 { 588 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 589 return cpu_to_be32(NFS4ERR_RESOURCE); 590 return 0; 591 } 592 593 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz) 594 { 595 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0) 596 return cpu_to_be32(NFS4ERR_RESOURCE); 597 return 0; 598 } 599 600 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 601 { 602 __be32 *p; 603 604 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 605 return 0; 606 p = xdr_reserve_space(xdr, 8); 607 if (unlikely(!p)) 608 return htonl(NFS4ERR_RESOURCE); 609 p = xdr_encode_hyper(p, change); 610 return 0; 611 } 612 613 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 614 { 615 __be32 *p; 616 617 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 618 return 0; 619 p = xdr_reserve_space(xdr, 8); 620 if (unlikely(!p)) 621 return htonl(NFS4ERR_RESOURCE); 622 p = xdr_encode_hyper(p, size); 623 return 0; 624 } 625 626 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time) 627 { 628 __be32 *p; 629 630 p = xdr_reserve_space(xdr, 12); 631 if (unlikely(!p)) 632 return htonl(NFS4ERR_RESOURCE); 633 p = xdr_encode_hyper(p, time->tv_sec); 634 *p = htonl(time->tv_nsec); 635 return 0; 636 } 637 638 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 639 { 640 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 641 return 0; 642 return encode_attr_time(xdr,time); 643 } 644 645 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 646 { 647 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 648 return 0; 649 return encode_attr_time(xdr,time); 650 } 651 652 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 653 { 654 __be32 status; 655 656 hdr->status = xdr_reserve_space(xdr, 4); 657 if (unlikely(hdr->status == NULL)) 658 return htonl(NFS4ERR_RESOURCE); 659 status = encode_string(xdr, hdr->taglen, hdr->tag); 660 if (unlikely(status != 0)) 661 return status; 662 hdr->nops = xdr_reserve_space(xdr, 4); 663 if (unlikely(hdr->nops == NULL)) 664 return htonl(NFS4ERR_RESOURCE); 665 return 0; 666 } 667 668 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 669 { 670 __be32 *p; 671 672 p = xdr_reserve_space(xdr, 8); 673 if (unlikely(p == NULL)) 674 return htonl(NFS4ERR_RESOURCE_HDR); 675 *p++ = htonl(op); 676 *p = res; 677 return 0; 678 } 679 680 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, 681 const void *resp) 682 { 683 const struct cb_getattrres *res = resp; 684 __be32 *savep = NULL; 685 __be32 status = res->status; 686 687 if (unlikely(status != 0)) 688 goto out; 689 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap)); 690 if (unlikely(status != 0)) 691 goto out; 692 status = cpu_to_be32(NFS4ERR_RESOURCE); 693 savep = xdr_reserve_space(xdr, sizeof(*savep)); 694 if (unlikely(!savep)) 695 goto out; 696 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 697 if (unlikely(status != 0)) 698 goto out; 699 status = encode_attr_size(xdr, res->bitmap, res->size); 700 if (unlikely(status != 0)) 701 goto out; 702 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 703 if (unlikely(status != 0)) 704 goto out; 705 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 706 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 707 out: 708 return status; 709 } 710 711 #if defined(CONFIG_NFS_V4_1) 712 713 static __be32 encode_sessionid(struct xdr_stream *xdr, 714 const struct nfs4_sessionid *sid) 715 { 716 __be32 *p; 717 718 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 719 if (unlikely(p == NULL)) 720 return htonl(NFS4ERR_RESOURCE); 721 722 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 723 return 0; 724 } 725 726 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 727 struct xdr_stream *xdr, 728 const void *resp) 729 { 730 const struct cb_sequenceres *res = resp; 731 __be32 *p; 732 __be32 status = res->csr_status; 733 734 if (unlikely(status != 0)) 735 return status; 736 737 status = encode_sessionid(xdr, &res->csr_sessionid); 738 if (status) 739 return status; 740 741 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 742 if (unlikely(p == NULL)) 743 return htonl(NFS4ERR_RESOURCE); 744 745 *p++ = htonl(res->csr_sequenceid); 746 *p++ = htonl(res->csr_slotid); 747 *p++ = htonl(res->csr_highestslotid); 748 *p++ = htonl(res->csr_target_highestslotid); 749 return 0; 750 } 751 752 static __be32 753 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 754 { 755 if (op_nr == OP_CB_SEQUENCE) { 756 if (nop != 0) 757 return htonl(NFS4ERR_SEQUENCE_POS); 758 } else { 759 if (nop == 0) 760 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 761 } 762 763 switch (op_nr) { 764 case OP_CB_GETATTR: 765 case OP_CB_RECALL: 766 case OP_CB_SEQUENCE: 767 case OP_CB_RECALL_ANY: 768 case OP_CB_RECALL_SLOT: 769 case OP_CB_LAYOUTRECALL: 770 case OP_CB_NOTIFY_DEVICEID: 771 case OP_CB_NOTIFY_LOCK: 772 *op = &callback_ops[op_nr]; 773 break; 774 775 case OP_CB_NOTIFY: 776 case OP_CB_PUSH_DELEG: 777 case OP_CB_RECALLABLE_OBJ_AVAIL: 778 case OP_CB_WANTS_CANCELLED: 779 return htonl(NFS4ERR_NOTSUPP); 780 781 default: 782 return htonl(NFS4ERR_OP_ILLEGAL); 783 } 784 785 return htonl(NFS_OK); 786 } 787 788 static void nfs4_callback_free_slot(struct nfs4_session *session, 789 struct nfs4_slot *slot) 790 { 791 struct nfs4_slot_table *tbl = &session->bc_slot_table; 792 793 spin_lock(&tbl->slot_tbl_lock); 794 /* 795 * Let the state manager know callback processing done. 796 * A single slot, so highest used slotid is either 0 or -1 797 */ 798 nfs4_free_slot(tbl, slot); 799 spin_unlock(&tbl->slot_tbl_lock); 800 } 801 802 static void nfs4_cb_free_slot(struct cb_process_state *cps) 803 { 804 if (cps->slot) { 805 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 806 cps->slot = NULL; 807 } 808 } 809 810 #else /* CONFIG_NFS_V4_1 */ 811 812 static __be32 813 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 814 { 815 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 816 } 817 818 static void nfs4_cb_free_slot(struct cb_process_state *cps) 819 { 820 } 821 #endif /* CONFIG_NFS_V4_1 */ 822 823 #ifdef CONFIG_NFS_V4_2 824 static __be32 825 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 826 { 827 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 828 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 829 return status; 830 831 if (op_nr == OP_CB_OFFLOAD) { 832 *op = &callback_ops[op_nr]; 833 return htonl(NFS_OK); 834 } else 835 return htonl(NFS4ERR_NOTSUPP); 836 return htonl(NFS4ERR_OP_ILLEGAL); 837 } 838 #else /* CONFIG_NFS_V4_2 */ 839 static __be32 840 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 841 { 842 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 843 } 844 #endif /* CONFIG_NFS_V4_2 */ 845 846 static __be32 847 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 848 { 849 switch (op_nr) { 850 case OP_CB_GETATTR: 851 case OP_CB_RECALL: 852 *op = &callback_ops[op_nr]; 853 break; 854 default: 855 return htonl(NFS4ERR_OP_ILLEGAL); 856 } 857 858 return htonl(NFS_OK); 859 } 860 861 static __be32 process_op(int nop, struct svc_rqst *rqstp, 862 struct cb_process_state *cps) 863 { 864 struct xdr_stream *xdr_out = &rqstp->rq_res_stream; 865 struct callback_op *op = &callback_ops[0]; 866 unsigned int op_nr; 867 __be32 status; 868 long maxlen; 869 __be32 res; 870 871 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr); 872 if (unlikely(status)) 873 return status; 874 875 switch (cps->minorversion) { 876 case 0: 877 status = preprocess_nfs4_op(op_nr, &op); 878 break; 879 case 1: 880 status = preprocess_nfs41_op(nop, op_nr, &op); 881 break; 882 case 2: 883 status = preprocess_nfs42_op(nop, op_nr, &op); 884 break; 885 default: 886 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 887 } 888 889 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 890 op_nr = OP_CB_ILLEGAL; 891 if (status) 892 goto encode_hdr; 893 894 if (cps->drc_status) { 895 status = cps->drc_status; 896 goto encode_hdr; 897 } 898 899 maxlen = xdr_out->end - xdr_out->p; 900 if (maxlen > 0 && maxlen < PAGE_SIZE) { 901 status = op->decode_args(rqstp, &rqstp->rq_arg_stream, 902 rqstp->rq_argp); 903 if (likely(status == 0)) 904 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp, 905 cps); 906 } else 907 status = htonl(NFS4ERR_RESOURCE); 908 909 encode_hdr: 910 res = encode_op_hdr(xdr_out, op_nr, status); 911 if (unlikely(res)) 912 return res; 913 if (op->encode_res != NULL && status == 0) 914 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp); 915 return status; 916 } 917 918 /* 919 * Decode, process and encode a COMPOUND 920 */ 921 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp) 922 { 923 struct cb_compound_hdr_arg hdr_arg = { 0 }; 924 struct cb_compound_hdr_res hdr_res = { NULL }; 925 struct cb_process_state cps = { 926 .drc_status = 0, 927 .clp = NULL, 928 .net = SVC_NET(rqstp), 929 }; 930 unsigned int nops = 0; 931 __be32 status; 932 933 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg); 934 if (status == htonl(NFS4ERR_RESOURCE)) 935 return rpc_garbage_args; 936 937 if (hdr_arg.minorversion == 0) { 938 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 939 if (!cps.clp) { 940 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident); 941 goto out_invalidcred; 942 } 943 if (!check_gss_callback_principal(cps.clp, rqstp)) { 944 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident); 945 nfs_put_client(cps.clp); 946 goto out_invalidcred; 947 } 948 } 949 950 cps.minorversion = hdr_arg.minorversion; 951 hdr_res.taglen = hdr_arg.taglen; 952 hdr_res.tag = hdr_arg.tag; 953 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) { 954 if (cps.clp) 955 nfs_put_client(cps.clp); 956 return rpc_system_err; 957 } 958 while (status == 0 && nops != hdr_arg.nops) { 959 status = process_op(nops, rqstp, &cps); 960 nops++; 961 } 962 963 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 964 * resource error in cb_compound status without returning op */ 965 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 966 status = htonl(NFS4ERR_RESOURCE); 967 nops--; 968 } 969 970 if (svc_is_backchannel(rqstp) && cps.clp) { 971 rqstp->bc_to_initval = cps.clp->cl_rpcclient->cl_timeout->to_initval; 972 rqstp->bc_to_retries = cps.clp->cl_rpcclient->cl_timeout->to_retries; 973 } 974 975 *hdr_res.status = status; 976 *hdr_res.nops = htonl(nops); 977 nfs4_cb_free_slot(&cps); 978 nfs_put_client(cps.clp); 979 return rpc_success; 980 981 out_invalidcred: 982 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 983 rqstp->rq_auth_stat = rpc_autherr_badcred; 984 return rpc_success; 985 } 986 987 static int 988 nfs_callback_dispatch(struct svc_rqst *rqstp) 989 { 990 const struct svc_procedure *procp = rqstp->rq_procinfo; 991 992 *rqstp->rq_accept_statp = procp->pc_func(rqstp); 993 return 1; 994 } 995 996 /* 997 * Define NFS4 callback COMPOUND ops. 998 */ 999 static struct callback_op callback_ops[] = { 1000 [0] = { 1001 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 1002 }, 1003 [OP_CB_GETATTR] = { 1004 .process_op = nfs4_callback_getattr, 1005 .decode_args = decode_getattr_args, 1006 .encode_res = encode_getattr_res, 1007 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 1008 }, 1009 [OP_CB_RECALL] = { 1010 .process_op = nfs4_callback_recall, 1011 .decode_args = decode_recall_args, 1012 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 1013 }, 1014 #if defined(CONFIG_NFS_V4_1) 1015 [OP_CB_LAYOUTRECALL] = { 1016 .process_op = nfs4_callback_layoutrecall, 1017 .decode_args = decode_layoutrecall_args, 1018 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 1019 }, 1020 [OP_CB_NOTIFY_DEVICEID] = { 1021 .process_op = nfs4_callback_devicenotify, 1022 .decode_args = decode_devicenotify_args, 1023 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 1024 }, 1025 [OP_CB_SEQUENCE] = { 1026 .process_op = nfs4_callback_sequence, 1027 .decode_args = decode_cb_sequence_args, 1028 .encode_res = encode_cb_sequence_res, 1029 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 1030 }, 1031 [OP_CB_RECALL_ANY] = { 1032 .process_op = nfs4_callback_recallany, 1033 .decode_args = decode_recallany_args, 1034 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 1035 }, 1036 [OP_CB_RECALL_SLOT] = { 1037 .process_op = nfs4_callback_recallslot, 1038 .decode_args = decode_recallslot_args, 1039 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 1040 }, 1041 [OP_CB_NOTIFY_LOCK] = { 1042 .process_op = nfs4_callback_notify_lock, 1043 .decode_args = decode_notify_lock_args, 1044 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 1045 }, 1046 #endif /* CONFIG_NFS_V4_1 */ 1047 #ifdef CONFIG_NFS_V4_2 1048 [OP_CB_OFFLOAD] = { 1049 .process_op = nfs4_callback_offload, 1050 .decode_args = decode_offload_args, 1051 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ, 1052 }, 1053 #endif /* CONFIG_NFS_V4_2 */ 1054 }; 1055 1056 /* 1057 * Define NFS4 callback procedures 1058 */ 1059 static const struct svc_procedure nfs4_callback_procedures1[] = { 1060 [CB_NULL] = { 1061 .pc_func = nfs4_callback_null, 1062 .pc_encode = nfs4_encode_void, 1063 .pc_xdrressize = 1, 1064 .pc_name = "NULL", 1065 }, 1066 [CB_COMPOUND] = { 1067 .pc_func = nfs4_callback_compound, 1068 .pc_encode = nfs4_encode_void, 1069 .pc_argsize = 256, 1070 .pc_argzero = 256, 1071 .pc_ressize = 256, 1072 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1073 .pc_name = "COMPOUND", 1074 } 1075 }; 1076 1077 static DEFINE_PER_CPU_ALIGNED(unsigned long, 1078 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 DEFINE_PER_CPU_ALIGNED(unsigned long, 1091 nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]); 1092 const struct svc_version nfs4_callback_version4 = { 1093 .vs_vers = 4, 1094 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1095 .vs_proc = nfs4_callback_procedures1, 1096 .vs_count = nfs4_callback_count4, 1097 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1098 .vs_dispatch = nfs_callback_dispatch, 1099 .vs_hidden = true, 1100 .vs_need_cong_ctrl = true, 1101 }; 1102