1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/nfs/callback_xdr.c 4 * 5 * Copyright (C) 2004 Trond Myklebust 6 * 7 * NFSv4 callback encode/decode procedures 8 */ 9 #include <linux/kernel.h> 10 #include <linux/sunrpc/svc.h> 11 #include <linux/nfs4.h> 12 #include <linux/nfs_fs.h> 13 #include <linux/ratelimit.h> 14 #include <linux/printk.h> 15 #include <linux/slab.h> 16 #include <linux/sunrpc/bc_xprt.h> 17 #include "nfs4_fs.h" 18 #include "callback.h" 19 #include "internal.h" 20 #include "nfs4session.h" 21 #include "nfs4trace.h" 22 23 #define CB_OP_TAGLEN_MAXSZ (512) 24 #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status 25 #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps 26 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 27 CB_OP_GETATTR_BITMAP_MAXSZ + \ 28 /* change, size, atime, ctime, 29 * mtime, deleg_atime, deleg_mtime */\ 30 (2 + 2 + 3 + 3 + 3 + 3 + 3) * 4) 31 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 32 33 #if defined(CONFIG_NFS_V4_1) 34 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 35 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 36 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 37 NFS4_MAX_SESSIONID_LEN + \ 38 (1 + 3) * 4) // seqid, 3 slotids 39 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 40 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 41 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 42 #endif /* CONFIG_NFS_V4_1 */ 43 #ifdef CONFIG_NFS_V4_2 44 #define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 45 #endif /* CONFIG_NFS_V4_2 */ 46 47 #define NFSDBG_FACILITY NFSDBG_CALLBACK 48 49 /* Internal error code */ 50 #define NFS4ERR_RESOURCE_HDR 11050 51 52 struct callback_op { 53 __be32 (*process_op)(void *, void *, struct cb_process_state *); 54 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *); 55 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *, 56 const void *); 57 long res_maxsize; 58 }; 59 60 static struct callback_op callback_ops[]; 61 62 static __be32 nfs4_callback_null(struct svc_rqst *rqstp) 63 { 64 return htonl(NFS4_OK); 65 } 66 67 /* 68 * svc_process_common() looks for an XDR encoder to know when 69 * not to drop a Reply. 70 */ 71 static bool nfs4_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr) 72 { 73 return true; 74 } 75 76 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, 77 const char **str, size_t maxlen) 78 { 79 ssize_t err; 80 81 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen); 82 if (err < 0) 83 return cpu_to_be32(NFS4ERR_RESOURCE); 84 *len = err; 85 return 0; 86 } 87 88 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 89 { 90 __be32 *p; 91 92 p = xdr_inline_decode(xdr, 4); 93 if (unlikely(p == NULL)) 94 return htonl(NFS4ERR_RESOURCE); 95 fh->size = ntohl(*p); 96 if (fh->size > NFS4_FHSIZE) 97 return htonl(NFS4ERR_BADHANDLE); 98 p = xdr_inline_decode(xdr, fh->size); 99 if (unlikely(p == NULL)) 100 return htonl(NFS4ERR_RESOURCE); 101 memcpy(&fh->data[0], p, fh->size); 102 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 103 return 0; 104 } 105 106 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 107 { 108 __be32 *p; 109 unsigned int attrlen; 110 111 p = xdr_inline_decode(xdr, 4); 112 if (unlikely(p == NULL)) 113 return htonl(NFS4ERR_RESOURCE); 114 attrlen = ntohl(*p); 115 p = xdr_inline_decode(xdr, attrlen << 2); 116 if (unlikely(p == NULL)) 117 return htonl(NFS4ERR_RESOURCE); 118 if (likely(attrlen > 0)) 119 bitmap[0] = ntohl(*p++); 120 if (attrlen > 1) 121 bitmap[1] = ntohl(*p++); 122 if (attrlen > 2) 123 bitmap[2] = ntohl(*p); 124 return 0; 125 } 126 127 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 128 { 129 __be32 *p; 130 131 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 132 if (unlikely(p == NULL)) 133 return htonl(NFS4ERR_RESOURCE); 134 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 135 return 0; 136 } 137 138 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 139 { 140 stateid->type = NFS4_DELEGATION_STATEID_TYPE; 141 return decode_stateid(xdr, stateid); 142 } 143 144 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 145 { 146 __be32 *p; 147 __be32 status; 148 149 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ); 150 if (unlikely(status != 0)) 151 return status; 152 p = xdr_inline_decode(xdr, 12); 153 if (unlikely(p == NULL)) 154 return htonl(NFS4ERR_RESOURCE); 155 hdr->minorversion = ntohl(*p++); 156 /* Check for minor version support */ 157 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) { 158 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */ 159 } else { 160 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with " 161 "illegal minor version %u!\n", 162 __func__, hdr->minorversion); 163 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 164 } 165 hdr->nops = ntohl(*p); 166 return 0; 167 } 168 169 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 170 { 171 __be32 *p; 172 p = xdr_inline_decode(xdr, 4); 173 if (unlikely(p == NULL)) 174 return htonl(NFS4ERR_RESOURCE_HDR); 175 *op = ntohl(*p); 176 return 0; 177 } 178 179 static __be32 decode_getattr_args(struct svc_rqst *rqstp, 180 struct xdr_stream *xdr, void *argp) 181 { 182 struct cb_getattrargs *args = argp; 183 __be32 status; 184 185 status = decode_fh(xdr, &args->fh); 186 if (unlikely(status != 0)) 187 return status; 188 return decode_bitmap(xdr, args->bitmap); 189 } 190 191 static __be32 decode_recall_args(struct svc_rqst *rqstp, 192 struct xdr_stream *xdr, void *argp) 193 { 194 struct cb_recallargs *args = argp; 195 __be32 *p; 196 __be32 status; 197 198 status = decode_delegation_stateid(xdr, &args->stateid); 199 if (unlikely(status != 0)) 200 return status; 201 p = xdr_inline_decode(xdr, 4); 202 if (unlikely(p == NULL)) 203 return htonl(NFS4ERR_RESOURCE); 204 args->truncate = ntohl(*p); 205 return decode_fh(xdr, &args->fh); 206 } 207 208 #if defined(CONFIG_NFS_V4_1) 209 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 210 { 211 stateid->type = NFS4_LAYOUT_STATEID_TYPE; 212 return decode_stateid(xdr, stateid); 213 } 214 215 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 216 struct xdr_stream *xdr, void *argp) 217 { 218 struct cb_layoutrecallargs *args = argp; 219 __be32 *p; 220 __be32 status = 0; 221 uint32_t iomode; 222 223 p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t)); 224 if (unlikely(p == NULL)) 225 return htonl(NFS4ERR_BADXDR); 226 227 args->cbl_layout_type = ntohl(*p++); 228 /* Depite the spec's xdr, iomode really belongs in the FILE switch, 229 * as it is unusable and ignored with the other types. 230 */ 231 iomode = ntohl(*p++); 232 args->cbl_layoutchanged = ntohl(*p++); 233 args->cbl_recall_type = ntohl(*p++); 234 235 if (args->cbl_recall_type == RETURN_FILE) { 236 args->cbl_range.iomode = iomode; 237 status = decode_fh(xdr, &args->cbl_fh); 238 if (unlikely(status != 0)) 239 return status; 240 241 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t)); 242 if (unlikely(p == NULL)) 243 return htonl(NFS4ERR_BADXDR); 244 p = xdr_decode_hyper(p, &args->cbl_range.offset); 245 p = xdr_decode_hyper(p, &args->cbl_range.length); 246 return decode_layout_stateid(xdr, &args->cbl_stateid); 247 } else if (args->cbl_recall_type == RETURN_FSID) { 248 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t)); 249 if (unlikely(p == NULL)) 250 return htonl(NFS4ERR_BADXDR); 251 p = xdr_decode_hyper(p, &args->cbl_fsid.major); 252 p = xdr_decode_hyper(p, &args->cbl_fsid.minor); 253 } else if (args->cbl_recall_type != RETURN_ALL) 254 return htonl(NFS4ERR_BADXDR); 255 return 0; 256 } 257 258 static 259 __be32 decode_devicenotify_args(struct svc_rqst *rqstp, 260 struct xdr_stream *xdr, 261 void *argp) 262 { 263 struct cb_devicenotifyargs *args = argp; 264 uint32_t tmp, n, i; 265 __be32 *p; 266 __be32 status = 0; 267 268 /* Num of device notifications */ 269 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 270 if (unlikely(p == NULL)) { 271 status = htonl(NFS4ERR_BADXDR); 272 goto out; 273 } 274 n = ntohl(*p++); 275 if (n == 0) 276 goto out; 277 278 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL); 279 if (!args->devs) { 280 status = htonl(NFS4ERR_DELAY); 281 goto out; 282 } 283 284 /* Decode each dev notification */ 285 for (i = 0; i < n; i++) { 286 struct cb_devicenotifyitem *dev = &args->devs[i]; 287 288 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) + 289 NFS4_DEVICEID4_SIZE); 290 if (unlikely(p == NULL)) { 291 status = htonl(NFS4ERR_BADXDR); 292 goto err; 293 } 294 295 tmp = ntohl(*p++); /* bitmap size */ 296 if (tmp != 1) { 297 status = htonl(NFS4ERR_INVAL); 298 goto err; 299 } 300 dev->cbd_notify_type = ntohl(*p++); 301 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 302 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 303 status = htonl(NFS4ERR_INVAL); 304 goto err; 305 } 306 307 tmp = ntohl(*p++); /* opaque size */ 308 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 309 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 310 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 311 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 312 status = htonl(NFS4ERR_INVAL); 313 goto err; 314 } 315 dev->cbd_layout_type = ntohl(*p++); 316 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 317 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 318 319 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 320 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 321 if (unlikely(p == NULL)) { 322 status = htonl(NFS4ERR_BADXDR); 323 goto err; 324 } 325 dev->cbd_immediate = ntohl(*p++); 326 } else { 327 dev->cbd_immediate = 0; 328 } 329 330 dprintk("%s: type %d layout 0x%x immediate %d\n", 331 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 332 dev->cbd_immediate); 333 } 334 args->ndevs = n; 335 dprintk("%s: ndevs %d\n", __func__, args->ndevs); 336 return 0; 337 err: 338 kfree(args->devs); 339 out: 340 args->devs = NULL; 341 args->ndevs = 0; 342 dprintk("%s: status %d ndevs %d\n", 343 __func__, ntohl(status), args->ndevs); 344 return status; 345 } 346 347 static __be32 decode_sessionid(struct xdr_stream *xdr, 348 struct nfs4_sessionid *sid) 349 { 350 __be32 *p; 351 352 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN); 353 if (unlikely(p == NULL)) 354 return htonl(NFS4ERR_RESOURCE); 355 356 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN); 357 return 0; 358 } 359 360 static __be32 decode_rc_list(struct xdr_stream *xdr, 361 struct referring_call_list *rc_list) 362 { 363 __be32 *p; 364 int i; 365 __be32 status; 366 367 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 368 if (status) 369 goto out; 370 371 status = htonl(NFS4ERR_RESOURCE); 372 p = xdr_inline_decode(xdr, sizeof(uint32_t)); 373 if (unlikely(p == NULL)) 374 goto out; 375 376 rc_list->rcl_nrefcalls = ntohl(*p++); 377 if (rc_list->rcl_nrefcalls) { 378 if (unlikely(rc_list->rcl_nrefcalls > xdr->buf->len)) 379 goto out; 380 p = xdr_inline_decode(xdr, 381 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 382 if (unlikely(p == NULL)) 383 goto out; 384 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls, 385 sizeof(*rc_list->rcl_refcalls), 386 GFP_KERNEL); 387 if (unlikely(rc_list->rcl_refcalls == NULL)) 388 goto out; 389 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 390 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 391 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 392 } 393 } 394 status = 0; 395 396 out: 397 return status; 398 } 399 400 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 401 struct xdr_stream *xdr, 402 void *argp) 403 { 404 struct cb_sequenceargs *args = argp; 405 __be32 *p; 406 int i; 407 __be32 status; 408 409 status = decode_sessionid(xdr, &args->csa_sessionid); 410 if (status) 411 return status; 412 413 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t)); 414 if (unlikely(p == NULL)) 415 return htonl(NFS4ERR_RESOURCE); 416 417 args->csa_addr = svc_addr(rqstp); 418 args->csa_sequenceid = ntohl(*p++); 419 args->csa_slotid = ntohl(*p++); 420 args->csa_highestslotid = ntohl(*p++); 421 args->csa_cachethis = ntohl(*p++); 422 args->csa_nrclists = ntohl(*p++); 423 args->csa_rclists = NULL; 424 if (args->csa_nrclists) { 425 args->csa_rclists = kmalloc_array(args->csa_nrclists, 426 sizeof(*args->csa_rclists), 427 GFP_KERNEL); 428 if (unlikely(args->csa_rclists == NULL)) 429 return htonl(NFS4ERR_RESOURCE); 430 431 for (i = 0; i < args->csa_nrclists; i++) { 432 status = decode_rc_list(xdr, &args->csa_rclists[i]); 433 if (status) { 434 args->csa_nrclists = i; 435 goto out_free; 436 } 437 } 438 } 439 return 0; 440 441 out_free: 442 for (i = 0; i < args->csa_nrclists; i++) 443 kfree(args->csa_rclists[i].rcl_refcalls); 444 kfree(args->csa_rclists); 445 return status; 446 } 447 448 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 449 struct xdr_stream *xdr, 450 void *argp) 451 { 452 struct cb_recallanyargs *args = argp; 453 uint32_t bitmap[3]; 454 __be32 *p, status; 455 456 p = xdr_inline_decode(xdr, 4); 457 if (unlikely(p == NULL)) 458 return htonl(NFS4ERR_BADXDR); 459 args->craa_objs_to_keep = ntohl(*p++); 460 status = decode_bitmap(xdr, bitmap); 461 if (unlikely(status)) 462 return status; 463 args->craa_type_mask = bitmap[0]; 464 465 return 0; 466 } 467 468 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 469 struct xdr_stream *xdr, 470 void *argp) 471 { 472 struct cb_recallslotargs *args = argp; 473 __be32 *p; 474 475 p = xdr_inline_decode(xdr, 4); 476 if (unlikely(p == NULL)) 477 return htonl(NFS4ERR_BADXDR); 478 args->crsa_target_highest_slotid = ntohl(*p++); 479 return 0; 480 } 481 482 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) 483 { 484 __be32 *p; 485 unsigned int len; 486 487 p = xdr_inline_decode(xdr, 12); 488 if (unlikely(p == NULL)) 489 return htonl(NFS4ERR_BADXDR); 490 491 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); 492 len = be32_to_cpu(*p); 493 494 p = xdr_inline_decode(xdr, len); 495 if (unlikely(p == NULL)) 496 return htonl(NFS4ERR_BADXDR); 497 498 /* Only try to decode if the length is right */ 499 if (len == 20) { 500 p += 2; /* skip "lock id:" */ 501 args->cbnl_owner.s_dev = be32_to_cpu(*p++); 502 xdr_decode_hyper(p, &args->cbnl_owner.id); 503 args->cbnl_valid = true; 504 } else { 505 args->cbnl_owner.s_dev = 0; 506 args->cbnl_owner.id = 0; 507 args->cbnl_valid = false; 508 } 509 return 0; 510 } 511 512 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, 513 struct xdr_stream *xdr, void *argp) 514 { 515 struct cb_notify_lock_args *args = argp; 516 __be32 status; 517 518 status = decode_fh(xdr, &args->cbnl_fh); 519 if (unlikely(status != 0)) 520 return status; 521 return decode_lockowner(xdr, args); 522 } 523 524 #endif /* CONFIG_NFS_V4_1 */ 525 #ifdef CONFIG_NFS_V4_2 526 static __be32 decode_write_response(struct xdr_stream *xdr, 527 struct cb_offloadargs *args) 528 { 529 __be32 *p; 530 531 /* skip the always zero field */ 532 p = xdr_inline_decode(xdr, 4); 533 if (unlikely(!p)) 534 goto out; 535 p++; 536 537 /* decode count, stable_how, verifier */ 538 p = xdr_inline_decode(xdr, 8 + 4); 539 if (unlikely(!p)) 540 goto out; 541 p = xdr_decode_hyper(p, &args->wr_count); 542 args->wr_writeverf.committed = be32_to_cpup(p); 543 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE); 544 if (likely(p)) { 545 memcpy(&args->wr_writeverf.verifier.data[0], p, 546 NFS4_VERIFIER_SIZE); 547 return 0; 548 } 549 out: 550 return htonl(NFS4ERR_RESOURCE); 551 } 552 553 static __be32 decode_offload_args(struct svc_rqst *rqstp, 554 struct xdr_stream *xdr, 555 void *data) 556 { 557 struct cb_offloadargs *args = data; 558 __be32 *p; 559 __be32 status; 560 561 /* decode fh */ 562 status = decode_fh(xdr, &args->coa_fh); 563 if (unlikely(status != 0)) 564 return status; 565 566 /* decode stateid */ 567 status = decode_stateid(xdr, &args->coa_stateid); 568 if (unlikely(status != 0)) 569 return status; 570 571 /* decode status */ 572 p = xdr_inline_decode(xdr, 4); 573 if (unlikely(!p)) 574 goto out; 575 args->error = ntohl(*p++); 576 if (!args->error) { 577 status = decode_write_response(xdr, args); 578 if (unlikely(status != 0)) 579 return status; 580 } else { 581 p = xdr_inline_decode(xdr, 8); 582 if (unlikely(!p)) 583 goto out; 584 p = xdr_decode_hyper(p, &args->wr_count); 585 } 586 return 0; 587 out: 588 return htonl(NFS4ERR_RESOURCE); 589 } 590 #endif /* CONFIG_NFS_V4_2 */ 591 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 592 { 593 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 594 return cpu_to_be32(NFS4ERR_RESOURCE); 595 return 0; 596 } 597 598 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz) 599 { 600 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0) 601 return cpu_to_be32(NFS4ERR_RESOURCE); 602 return 0; 603 } 604 605 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 606 { 607 __be32 *p; 608 609 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 610 return 0; 611 p = xdr_reserve_space(xdr, 8); 612 if (unlikely(!p)) 613 return htonl(NFS4ERR_RESOURCE); 614 p = xdr_encode_hyper(p, change); 615 return 0; 616 } 617 618 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 619 { 620 __be32 *p; 621 622 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 623 return 0; 624 p = xdr_reserve_space(xdr, 8); 625 if (unlikely(!p)) 626 return htonl(NFS4ERR_RESOURCE); 627 p = xdr_encode_hyper(p, size); 628 return 0; 629 } 630 631 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time) 632 { 633 __be32 *p; 634 635 p = xdr_reserve_space(xdr, 12); 636 if (unlikely(!p)) 637 return htonl(NFS4ERR_RESOURCE); 638 p = xdr_encode_hyper(p, time->tv_sec); 639 *p = htonl(time->tv_nsec); 640 return 0; 641 } 642 643 static __be32 encode_attr_atime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 644 { 645 if (!(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) 646 return 0; 647 return encode_attr_time(xdr,time); 648 } 649 650 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 651 { 652 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 653 return 0; 654 return encode_attr_time(xdr,time); 655 } 656 657 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time) 658 { 659 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 660 return 0; 661 return encode_attr_time(xdr,time); 662 } 663 664 static __be32 encode_attr_delegatime(struct xdr_stream *xdr, 665 const uint32_t *bitmap, 666 const struct timespec64 *time) 667 { 668 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_ACCESS)) 669 return 0; 670 return encode_attr_time(xdr,time); 671 } 672 673 static __be32 encode_attr_delegmtime(struct xdr_stream *xdr, 674 const uint32_t *bitmap, 675 const struct timespec64 *time) 676 { 677 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_MODIFY)) 678 return 0; 679 return encode_attr_time(xdr,time); 680 } 681 682 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 683 { 684 __be32 status; 685 686 hdr->status = xdr_reserve_space(xdr, 4); 687 if (unlikely(hdr->status == NULL)) 688 return htonl(NFS4ERR_RESOURCE); 689 status = encode_string(xdr, hdr->taglen, hdr->tag); 690 if (unlikely(status != 0)) 691 return status; 692 hdr->nops = xdr_reserve_space(xdr, 4); 693 if (unlikely(hdr->nops == NULL)) 694 return htonl(NFS4ERR_RESOURCE); 695 return 0; 696 } 697 698 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 699 { 700 __be32 *p; 701 702 p = xdr_reserve_space(xdr, 8); 703 if (unlikely(p == NULL)) 704 return htonl(NFS4ERR_RESOURCE_HDR); 705 *p++ = htonl(op); 706 *p = res; 707 return 0; 708 } 709 710 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, 711 const void *resp) 712 { 713 const struct cb_getattrres *res = resp; 714 __be32 *savep = NULL; 715 __be32 status = res->status; 716 717 if (unlikely(status != 0)) 718 goto out; 719 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap)); 720 if (unlikely(status != 0)) 721 goto out; 722 status = cpu_to_be32(NFS4ERR_RESOURCE); 723 savep = xdr_reserve_space(xdr, sizeof(*savep)); 724 if (unlikely(!savep)) 725 goto out; 726 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 727 if (unlikely(status != 0)) 728 goto out; 729 status = encode_attr_size(xdr, res->bitmap, res->size); 730 if (unlikely(status != 0)) 731 goto out; 732 status = encode_attr_atime(xdr, res->bitmap, &res->atime); 733 if (unlikely(status != 0)) 734 goto out; 735 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 736 if (unlikely(status != 0)) 737 goto out; 738 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 739 if (unlikely(status != 0)) 740 goto out; 741 status = encode_attr_delegatime(xdr, res->bitmap, &res->atime); 742 if (unlikely(status != 0)) 743 goto out; 744 status = encode_attr_delegmtime(xdr, res->bitmap, &res->mtime); 745 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 746 out: 747 return status; 748 } 749 750 #if defined(CONFIG_NFS_V4_1) 751 752 static __be32 encode_sessionid(struct xdr_stream *xdr, 753 const struct nfs4_sessionid *sid) 754 { 755 __be32 *p; 756 757 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 758 if (unlikely(p == NULL)) 759 return htonl(NFS4ERR_RESOURCE); 760 761 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 762 return 0; 763 } 764 765 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 766 struct xdr_stream *xdr, 767 const void *resp) 768 { 769 const struct cb_sequenceres *res = resp; 770 __be32 *p; 771 __be32 status = res->csr_status; 772 773 if (unlikely(status != 0)) 774 return status; 775 776 status = encode_sessionid(xdr, &res->csr_sessionid); 777 if (status) 778 return status; 779 780 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 781 if (unlikely(p == NULL)) 782 return htonl(NFS4ERR_RESOURCE); 783 784 *p++ = htonl(res->csr_sequenceid); 785 *p++ = htonl(res->csr_slotid); 786 *p++ = htonl(res->csr_highestslotid); 787 *p++ = htonl(res->csr_target_highestslotid); 788 return 0; 789 } 790 791 static __be32 792 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 793 { 794 if (op_nr == OP_CB_SEQUENCE) { 795 if (nop != 0) 796 return htonl(NFS4ERR_SEQUENCE_POS); 797 } else { 798 if (nop == 0) 799 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 800 } 801 802 switch (op_nr) { 803 case OP_CB_GETATTR: 804 case OP_CB_RECALL: 805 case OP_CB_SEQUENCE: 806 case OP_CB_RECALL_ANY: 807 case OP_CB_RECALL_SLOT: 808 case OP_CB_LAYOUTRECALL: 809 case OP_CB_NOTIFY_DEVICEID: 810 case OP_CB_NOTIFY_LOCK: 811 *op = &callback_ops[op_nr]; 812 break; 813 814 case OP_CB_NOTIFY: 815 case OP_CB_PUSH_DELEG: 816 case OP_CB_RECALLABLE_OBJ_AVAIL: 817 case OP_CB_WANTS_CANCELLED: 818 return htonl(NFS4ERR_NOTSUPP); 819 820 default: 821 return htonl(NFS4ERR_OP_ILLEGAL); 822 } 823 824 return htonl(NFS_OK); 825 } 826 827 static void nfs4_callback_free_slot(struct nfs4_session *session, 828 struct nfs4_slot *slot) 829 { 830 struct nfs4_slot_table *tbl = &session->bc_slot_table; 831 832 spin_lock(&tbl->slot_tbl_lock); 833 /* 834 * Let the state manager know callback processing done. 835 * A single slot, so highest used slotid is either 0 or -1 836 */ 837 nfs4_free_slot(tbl, slot); 838 spin_unlock(&tbl->slot_tbl_lock); 839 } 840 841 static void nfs4_cb_free_slot(struct cb_process_state *cps) 842 { 843 if (cps->slot) { 844 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 845 cps->slot = NULL; 846 } 847 } 848 849 #else /* CONFIG_NFS_V4_1 */ 850 851 static __be32 852 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 853 { 854 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 855 } 856 857 static void nfs4_cb_free_slot(struct cb_process_state *cps) 858 { 859 } 860 #endif /* CONFIG_NFS_V4_1 */ 861 862 #ifdef CONFIG_NFS_V4_2 863 static __be32 864 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 865 { 866 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 867 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 868 return status; 869 870 if (op_nr == OP_CB_OFFLOAD) { 871 *op = &callback_ops[op_nr]; 872 return htonl(NFS_OK); 873 } else 874 return htonl(NFS4ERR_NOTSUPP); 875 return htonl(NFS4ERR_OP_ILLEGAL); 876 } 877 #else /* CONFIG_NFS_V4_2 */ 878 static __be32 879 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 880 { 881 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 882 } 883 #endif /* CONFIG_NFS_V4_2 */ 884 885 static __be32 886 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 887 { 888 switch (op_nr) { 889 case OP_CB_GETATTR: 890 case OP_CB_RECALL: 891 *op = &callback_ops[op_nr]; 892 break; 893 default: 894 return htonl(NFS4ERR_OP_ILLEGAL); 895 } 896 897 return htonl(NFS_OK); 898 } 899 900 static __be32 process_op(int nop, struct svc_rqst *rqstp, 901 struct cb_process_state *cps) 902 { 903 struct xdr_stream *xdr_out = &rqstp->rq_res_stream; 904 struct callback_op *op = &callback_ops[0]; 905 unsigned int op_nr; 906 __be32 status; 907 long maxlen; 908 __be32 res; 909 910 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr); 911 if (unlikely(status)) 912 return status; 913 914 switch (cps->minorversion) { 915 case 0: 916 status = preprocess_nfs4_op(op_nr, &op); 917 break; 918 case 1: 919 status = preprocess_nfs41_op(nop, op_nr, &op); 920 break; 921 case 2: 922 status = preprocess_nfs42_op(nop, op_nr, &op); 923 break; 924 default: 925 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 926 } 927 928 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 929 op_nr = OP_CB_ILLEGAL; 930 if (status) 931 goto encode_hdr; 932 933 if (cps->drc_status) { 934 status = cps->drc_status; 935 goto encode_hdr; 936 } 937 938 maxlen = xdr_out->end - xdr_out->p; 939 if (maxlen > 0 && maxlen < PAGE_SIZE) { 940 status = op->decode_args(rqstp, &rqstp->rq_arg_stream, 941 rqstp->rq_argp); 942 if (likely(status == 0)) 943 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp, 944 cps); 945 } else 946 status = htonl(NFS4ERR_RESOURCE); 947 948 encode_hdr: 949 res = encode_op_hdr(xdr_out, op_nr, status); 950 if (unlikely(res)) 951 return res; 952 if (op->encode_res != NULL && status == 0) 953 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp); 954 return status; 955 } 956 957 /* 958 * Decode, process and encode a COMPOUND 959 */ 960 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp) 961 { 962 struct cb_compound_hdr_arg hdr_arg = { 0 }; 963 struct cb_compound_hdr_res hdr_res = { NULL }; 964 struct cb_process_state cps = { 965 .drc_status = 0, 966 .clp = NULL, 967 .net = SVC_NET(rqstp), 968 }; 969 unsigned int nops = 0; 970 __be32 status; 971 972 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg); 973 if (status == htonl(NFS4ERR_RESOURCE)) 974 return rpc_garbage_args; 975 976 if (hdr_arg.minorversion == 0) { 977 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 978 if (!cps.clp) { 979 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident); 980 goto out_invalidcred; 981 } 982 if (!check_gss_callback_principal(cps.clp, rqstp)) { 983 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident); 984 nfs_put_client(cps.clp); 985 goto out_invalidcred; 986 } 987 svc_xprt_set_valid(rqstp->rq_xprt); 988 } 989 990 cps.minorversion = hdr_arg.minorversion; 991 hdr_res.taglen = hdr_arg.taglen; 992 hdr_res.tag = hdr_arg.tag; 993 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) { 994 if (cps.clp) 995 nfs_put_client(cps.clp); 996 return rpc_system_err; 997 } 998 while (status == 0 && nops != hdr_arg.nops) { 999 status = process_op(nops, rqstp, &cps); 1000 nops++; 1001 } 1002 1003 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 1004 * resource error in cb_compound status without returning op */ 1005 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 1006 status = htonl(NFS4ERR_RESOURCE); 1007 nops--; 1008 } 1009 1010 if (svc_is_backchannel(rqstp) && cps.clp) { 1011 rqstp->bc_to_initval = cps.clp->cl_rpcclient->cl_timeout->to_initval; 1012 rqstp->bc_to_retries = cps.clp->cl_rpcclient->cl_timeout->to_retries; 1013 } 1014 1015 *hdr_res.status = status; 1016 *hdr_res.nops = htonl(nops); 1017 nfs4_cb_free_slot(&cps); 1018 nfs_put_client(cps.clp); 1019 return rpc_success; 1020 1021 out_invalidcred: 1022 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 1023 rqstp->rq_auth_stat = rpc_autherr_badcred; 1024 return rpc_success; 1025 } 1026 1027 static int 1028 nfs_callback_dispatch(struct svc_rqst *rqstp) 1029 { 1030 const struct svc_procedure *procp = rqstp->rq_procinfo; 1031 1032 *rqstp->rq_accept_statp = procp->pc_func(rqstp); 1033 return 1; 1034 } 1035 1036 /* 1037 * Define NFS4 callback COMPOUND ops. 1038 */ 1039 static struct callback_op callback_ops[] = { 1040 [0] = { 1041 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 1042 }, 1043 [OP_CB_GETATTR] = { 1044 .process_op = nfs4_callback_getattr, 1045 .decode_args = decode_getattr_args, 1046 .encode_res = encode_getattr_res, 1047 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 1048 }, 1049 [OP_CB_RECALL] = { 1050 .process_op = nfs4_callback_recall, 1051 .decode_args = decode_recall_args, 1052 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 1053 }, 1054 #if defined(CONFIG_NFS_V4_1) 1055 [OP_CB_LAYOUTRECALL] = { 1056 .process_op = nfs4_callback_layoutrecall, 1057 .decode_args = decode_layoutrecall_args, 1058 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 1059 }, 1060 [OP_CB_NOTIFY_DEVICEID] = { 1061 .process_op = nfs4_callback_devicenotify, 1062 .decode_args = decode_devicenotify_args, 1063 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 1064 }, 1065 [OP_CB_SEQUENCE] = { 1066 .process_op = nfs4_callback_sequence, 1067 .decode_args = decode_cb_sequence_args, 1068 .encode_res = encode_cb_sequence_res, 1069 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 1070 }, 1071 [OP_CB_RECALL_ANY] = { 1072 .process_op = nfs4_callback_recallany, 1073 .decode_args = decode_recallany_args, 1074 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 1075 }, 1076 [OP_CB_RECALL_SLOT] = { 1077 .process_op = nfs4_callback_recallslot, 1078 .decode_args = decode_recallslot_args, 1079 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 1080 }, 1081 [OP_CB_NOTIFY_LOCK] = { 1082 .process_op = nfs4_callback_notify_lock, 1083 .decode_args = decode_notify_lock_args, 1084 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 1085 }, 1086 #endif /* CONFIG_NFS_V4_1 */ 1087 #ifdef CONFIG_NFS_V4_2 1088 [OP_CB_OFFLOAD] = { 1089 .process_op = nfs4_callback_offload, 1090 .decode_args = decode_offload_args, 1091 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ, 1092 }, 1093 #endif /* CONFIG_NFS_V4_2 */ 1094 }; 1095 1096 /* 1097 * Define NFS4 callback procedures 1098 */ 1099 static const struct svc_procedure nfs4_callback_procedures1[] = { 1100 [CB_NULL] = { 1101 .pc_func = nfs4_callback_null, 1102 .pc_encode = nfs4_encode_void, 1103 .pc_xdrressize = 1, 1104 .pc_name = "NULL", 1105 }, 1106 [CB_COMPOUND] = { 1107 .pc_func = nfs4_callback_compound, 1108 .pc_encode = nfs4_encode_void, 1109 .pc_argsize = 256, 1110 .pc_argzero = 256, 1111 .pc_ressize = 256, 1112 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1113 .pc_name = "COMPOUND", 1114 } 1115 }; 1116 1117 static DEFINE_PER_CPU_ALIGNED(unsigned long, 1118 nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]); 1119 const struct svc_version nfs4_callback_version1 = { 1120 .vs_vers = 1, 1121 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1122 .vs_proc = nfs4_callback_procedures1, 1123 .vs_count = nfs4_callback_count1, 1124 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1125 .vs_dispatch = nfs_callback_dispatch, 1126 .vs_hidden = true, 1127 .vs_need_cong_ctrl = true, 1128 }; 1129 1130 static DEFINE_PER_CPU_ALIGNED(unsigned long, 1131 nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]); 1132 const struct svc_version nfs4_callback_version4 = { 1133 .vs_vers = 4, 1134 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1135 .vs_proc = nfs4_callback_procedures1, 1136 .vs_count = nfs4_callback_count4, 1137 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1138 .vs_dispatch = nfs_callback_dispatch, 1139 .vs_hidden = true, 1140 .vs_need_cong_ctrl = true, 1141 }; 1142