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 22 #define CB_OP_TAGLEN_MAXSZ (512) 23 #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status 24 #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps 25 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 26 CB_OP_GETATTR_BITMAP_MAXSZ + \ 27 /* change, size, ctime, mtime */\ 28 (2 + 2 + 3 + 3) * 4) 29 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 30 31 #if defined(CONFIG_NFS_V4_1) 32 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 33 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 34 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 35 NFS4_MAX_SESSIONID_LEN + \ 36 (1 + 3) * 4) // seqid, 3 slotids 37 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 38 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 39 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 40 #endif /* CONFIG_NFS_V4_1 */ 41 42 #define NFSDBG_FACILITY NFSDBG_CALLBACK 43 44 /* Internal error code */ 45 #define NFS4ERR_RESOURCE_HDR 11050 46 47 struct callback_op { 48 __be32 (*process_op)(void *, void *, struct cb_process_state *); 49 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *); 50 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *, 51 const void *); 52 long res_maxsize; 53 }; 54 55 static struct callback_op callback_ops[]; 56 57 static __be32 nfs4_callback_null(struct svc_rqst *rqstp) 58 { 59 return htonl(NFS4_OK); 60 } 61 62 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p) 63 { 64 return xdr_argsize_check(rqstp, p); 65 } 66 67 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p) 68 { 69 return xdr_ressize_check(rqstp, p); 70 } 71 72 static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes) 73 { 74 __be32 *p; 75 76 p = xdr_inline_decode(xdr, nbytes); 77 if (unlikely(p == NULL)) 78 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n"); 79 return p; 80 } 81 82 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, 83 const char **str, size_t maxlen) 84 { 85 ssize_t err; 86 87 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen); 88 if (err < 0) 89 return cpu_to_be32(NFS4ERR_RESOURCE); 90 *len = err; 91 return 0; 92 } 93 94 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 95 { 96 __be32 *p; 97 98 p = read_buf(xdr, 4); 99 if (unlikely(p == NULL)) 100 return htonl(NFS4ERR_RESOURCE); 101 fh->size = ntohl(*p); 102 if (fh->size > NFS4_FHSIZE) 103 return htonl(NFS4ERR_BADHANDLE); 104 p = read_buf(xdr, fh->size); 105 if (unlikely(p == NULL)) 106 return htonl(NFS4ERR_RESOURCE); 107 memcpy(&fh->data[0], p, fh->size); 108 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 109 return 0; 110 } 111 112 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 113 { 114 __be32 *p; 115 unsigned int attrlen; 116 117 p = read_buf(xdr, 4); 118 if (unlikely(p == NULL)) 119 return htonl(NFS4ERR_RESOURCE); 120 attrlen = ntohl(*p); 121 p = read_buf(xdr, attrlen << 2); 122 if (unlikely(p == NULL)) 123 return htonl(NFS4ERR_RESOURCE); 124 if (likely(attrlen > 0)) 125 bitmap[0] = ntohl(*p++); 126 if (attrlen > 1) 127 bitmap[1] = ntohl(*p); 128 return 0; 129 } 130 131 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 132 { 133 __be32 *p; 134 135 p = read_buf(xdr, NFS4_STATEID_SIZE); 136 if (unlikely(p == NULL)) 137 return htonl(NFS4ERR_RESOURCE); 138 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 139 return 0; 140 } 141 142 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 143 { 144 stateid->type = NFS4_DELEGATION_STATEID_TYPE; 145 return decode_stateid(xdr, stateid); 146 } 147 148 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 149 { 150 __be32 *p; 151 __be32 status; 152 153 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ); 154 if (unlikely(status != 0)) 155 return status; 156 p = read_buf(xdr, 12); 157 if (unlikely(p == NULL)) 158 return htonl(NFS4ERR_RESOURCE); 159 hdr->minorversion = ntohl(*p++); 160 /* Check for minor version support */ 161 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) { 162 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */ 163 } else { 164 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with " 165 "illegal minor version %u!\n", 166 __func__, hdr->minorversion); 167 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 168 } 169 hdr->nops = ntohl(*p); 170 return 0; 171 } 172 173 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 174 { 175 __be32 *p; 176 p = read_buf(xdr, 4); 177 if (unlikely(p == NULL)) 178 return htonl(NFS4ERR_RESOURCE_HDR); 179 *op = ntohl(*p); 180 return 0; 181 } 182 183 static __be32 decode_getattr_args(struct svc_rqst *rqstp, 184 struct xdr_stream *xdr, void *argp) 185 { 186 struct cb_getattrargs *args = argp; 187 __be32 status; 188 189 status = decode_fh(xdr, &args->fh); 190 if (unlikely(status != 0)) 191 return status; 192 return decode_bitmap(xdr, args->bitmap); 193 } 194 195 static __be32 decode_recall_args(struct svc_rqst *rqstp, 196 struct xdr_stream *xdr, void *argp) 197 { 198 struct cb_recallargs *args = argp; 199 __be32 *p; 200 __be32 status; 201 202 status = decode_delegation_stateid(xdr, &args->stateid); 203 if (unlikely(status != 0)) 204 return status; 205 p = read_buf(xdr, 4); 206 if (unlikely(p == NULL)) 207 return htonl(NFS4ERR_RESOURCE); 208 args->truncate = ntohl(*p); 209 return decode_fh(xdr, &args->fh); 210 } 211 212 #if defined(CONFIG_NFS_V4_1) 213 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 214 { 215 stateid->type = NFS4_LAYOUT_STATEID_TYPE; 216 return decode_stateid(xdr, stateid); 217 } 218 219 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 220 struct xdr_stream *xdr, void *argp) 221 { 222 struct cb_layoutrecallargs *args = argp; 223 __be32 *p; 224 __be32 status = 0; 225 uint32_t iomode; 226 227 p = read_buf(xdr, 4 * sizeof(uint32_t)); 228 if (unlikely(p == NULL)) 229 return htonl(NFS4ERR_BADXDR); 230 231 args->cbl_layout_type = ntohl(*p++); 232 /* Depite the spec's xdr, iomode really belongs in the FILE switch, 233 * as it is unusable and ignored with the other types. 234 */ 235 iomode = ntohl(*p++); 236 args->cbl_layoutchanged = ntohl(*p++); 237 args->cbl_recall_type = ntohl(*p++); 238 239 if (args->cbl_recall_type == RETURN_FILE) { 240 args->cbl_range.iomode = iomode; 241 status = decode_fh(xdr, &args->cbl_fh); 242 if (unlikely(status != 0)) 243 return status; 244 245 p = read_buf(xdr, 2 * sizeof(uint64_t)); 246 if (unlikely(p == NULL)) 247 return htonl(NFS4ERR_BADXDR); 248 p = xdr_decode_hyper(p, &args->cbl_range.offset); 249 p = xdr_decode_hyper(p, &args->cbl_range.length); 250 return decode_layout_stateid(xdr, &args->cbl_stateid); 251 } else if (args->cbl_recall_type == RETURN_FSID) { 252 p = read_buf(xdr, 2 * sizeof(uint64_t)); 253 if (unlikely(p == NULL)) 254 return htonl(NFS4ERR_BADXDR); 255 p = xdr_decode_hyper(p, &args->cbl_fsid.major); 256 p = xdr_decode_hyper(p, &args->cbl_fsid.minor); 257 } else if (args->cbl_recall_type != RETURN_ALL) 258 return htonl(NFS4ERR_BADXDR); 259 return 0; 260 } 261 262 static 263 __be32 decode_devicenotify_args(struct svc_rqst *rqstp, 264 struct xdr_stream *xdr, 265 void *argp) 266 { 267 struct cb_devicenotifyargs *args = argp; 268 __be32 *p; 269 __be32 status = 0; 270 u32 tmp; 271 int n, i; 272 args->ndevs = 0; 273 274 /* Num of device notifications */ 275 p = read_buf(xdr, sizeof(uint32_t)); 276 if (unlikely(p == NULL)) { 277 status = htonl(NFS4ERR_BADXDR); 278 goto out; 279 } 280 n = ntohl(*p++); 281 if (n <= 0) 282 goto out; 283 if (n > ULONG_MAX / sizeof(*args->devs)) { 284 status = htonl(NFS4ERR_BADXDR); 285 goto out; 286 } 287 288 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL); 289 if (!args->devs) { 290 status = htonl(NFS4ERR_DELAY); 291 goto out; 292 } 293 294 /* Decode each dev notification */ 295 for (i = 0; i < n; i++) { 296 struct cb_devicenotifyitem *dev = &args->devs[i]; 297 298 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE); 299 if (unlikely(p == NULL)) { 300 status = htonl(NFS4ERR_BADXDR); 301 goto err; 302 } 303 304 tmp = ntohl(*p++); /* bitmap size */ 305 if (tmp != 1) { 306 status = htonl(NFS4ERR_INVAL); 307 goto err; 308 } 309 dev->cbd_notify_type = ntohl(*p++); 310 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 311 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 312 status = htonl(NFS4ERR_INVAL); 313 goto err; 314 } 315 316 tmp = ntohl(*p++); /* opaque size */ 317 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 318 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 319 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 320 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 321 status = htonl(NFS4ERR_INVAL); 322 goto err; 323 } 324 dev->cbd_layout_type = ntohl(*p++); 325 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 326 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 327 328 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 329 p = read_buf(xdr, sizeof(uint32_t)); 330 if (unlikely(p == NULL)) { 331 status = htonl(NFS4ERR_BADXDR); 332 goto err; 333 } 334 dev->cbd_immediate = ntohl(*p++); 335 } else { 336 dev->cbd_immediate = 0; 337 } 338 339 args->ndevs++; 340 341 dprintk("%s: type %d layout 0x%x immediate %d\n", 342 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 343 dev->cbd_immediate); 344 } 345 out: 346 dprintk("%s: status %d ndevs %d\n", 347 __func__, ntohl(status), args->ndevs); 348 return status; 349 err: 350 kfree(args->devs); 351 goto out; 352 } 353 354 static __be32 decode_sessionid(struct xdr_stream *xdr, 355 struct nfs4_sessionid *sid) 356 { 357 __be32 *p; 358 359 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN); 360 if (unlikely(p == NULL)) 361 return htonl(NFS4ERR_RESOURCE); 362 363 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN); 364 return 0; 365 } 366 367 static __be32 decode_rc_list(struct xdr_stream *xdr, 368 struct referring_call_list *rc_list) 369 { 370 __be32 *p; 371 int i; 372 __be32 status; 373 374 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 375 if (status) 376 goto out; 377 378 status = htonl(NFS4ERR_RESOURCE); 379 p = read_buf(xdr, sizeof(uint32_t)); 380 if (unlikely(p == NULL)) 381 goto out; 382 383 rc_list->rcl_nrefcalls = ntohl(*p++); 384 if (rc_list->rcl_nrefcalls) { 385 p = read_buf(xdr, 386 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 387 if (unlikely(p == NULL)) 388 goto out; 389 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls, 390 sizeof(*rc_list->rcl_refcalls), 391 GFP_KERNEL); 392 if (unlikely(rc_list->rcl_refcalls == NULL)) 393 goto out; 394 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 395 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 396 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 397 } 398 } 399 status = 0; 400 401 out: 402 return status; 403 } 404 405 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 406 struct xdr_stream *xdr, 407 void *argp) 408 { 409 struct cb_sequenceargs *args = argp; 410 __be32 *p; 411 int i; 412 __be32 status; 413 414 status = decode_sessionid(xdr, &args->csa_sessionid); 415 if (status) 416 return status; 417 418 p = read_buf(xdr, 5 * sizeof(uint32_t)); 419 if (unlikely(p == NULL)) 420 return htonl(NFS4ERR_RESOURCE); 421 422 args->csa_addr = svc_addr(rqstp); 423 args->csa_sequenceid = ntohl(*p++); 424 args->csa_slotid = ntohl(*p++); 425 args->csa_highestslotid = ntohl(*p++); 426 args->csa_cachethis = ntohl(*p++); 427 args->csa_nrclists = ntohl(*p++); 428 args->csa_rclists = NULL; 429 if (args->csa_nrclists) { 430 args->csa_rclists = kmalloc_array(args->csa_nrclists, 431 sizeof(*args->csa_rclists), 432 GFP_KERNEL); 433 if (unlikely(args->csa_rclists == NULL)) 434 return htonl(NFS4ERR_RESOURCE); 435 436 for (i = 0; i < args->csa_nrclists; i++) { 437 status = decode_rc_list(xdr, &args->csa_rclists[i]); 438 if (status) { 439 args->csa_nrclists = i; 440 goto out_free; 441 } 442 } 443 } 444 return 0; 445 446 out_free: 447 for (i = 0; i < args->csa_nrclists; i++) 448 kfree(args->csa_rclists[i].rcl_refcalls); 449 kfree(args->csa_rclists); 450 return status; 451 } 452 453 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 454 struct xdr_stream *xdr, 455 void *argp) 456 { 457 struct cb_recallanyargs *args = argp; 458 uint32_t bitmap[2]; 459 __be32 *p, status; 460 461 p = read_buf(xdr, 4); 462 if (unlikely(p == NULL)) 463 return htonl(NFS4ERR_BADXDR); 464 args->craa_objs_to_keep = ntohl(*p++); 465 status = decode_bitmap(xdr, bitmap); 466 if (unlikely(status)) 467 return status; 468 args->craa_type_mask = bitmap[0]; 469 470 return 0; 471 } 472 473 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 474 struct xdr_stream *xdr, 475 void *argp) 476 { 477 struct cb_recallslotargs *args = argp; 478 __be32 *p; 479 480 p = read_buf(xdr, 4); 481 if (unlikely(p == NULL)) 482 return htonl(NFS4ERR_BADXDR); 483 args->crsa_target_highest_slotid = ntohl(*p++); 484 return 0; 485 } 486 487 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) 488 { 489 __be32 *p; 490 unsigned int len; 491 492 p = read_buf(xdr, 12); 493 if (unlikely(p == NULL)) 494 return htonl(NFS4ERR_BADXDR); 495 496 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); 497 len = be32_to_cpu(*p); 498 499 p = read_buf(xdr, len); 500 if (unlikely(p == NULL)) 501 return htonl(NFS4ERR_BADXDR); 502 503 /* Only try to decode if the length is right */ 504 if (len == 20) { 505 p += 2; /* skip "lock id:" */ 506 args->cbnl_owner.s_dev = be32_to_cpu(*p++); 507 xdr_decode_hyper(p, &args->cbnl_owner.id); 508 args->cbnl_valid = true; 509 } else { 510 args->cbnl_owner.s_dev = 0; 511 args->cbnl_owner.id = 0; 512 args->cbnl_valid = false; 513 } 514 return 0; 515 } 516 517 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, 518 struct xdr_stream *xdr, void *argp) 519 { 520 struct cb_notify_lock_args *args = argp; 521 __be32 status; 522 523 status = decode_fh(xdr, &args->cbnl_fh); 524 if (unlikely(status != 0)) 525 return status; 526 return decode_lockowner(xdr, args); 527 } 528 529 #endif /* CONFIG_NFS_V4_1 */ 530 531 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 532 { 533 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 534 return cpu_to_be32(NFS4ERR_RESOURCE); 535 return 0; 536 } 537 538 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 539 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 540 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 541 { 542 __be32 bm[2]; 543 __be32 *p; 544 545 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 546 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 547 if (bm[1] != 0) { 548 p = xdr_reserve_space(xdr, 16); 549 if (unlikely(p == NULL)) 550 return htonl(NFS4ERR_RESOURCE); 551 *p++ = htonl(2); 552 *p++ = bm[0]; 553 *p++ = bm[1]; 554 } else if (bm[0] != 0) { 555 p = xdr_reserve_space(xdr, 12); 556 if (unlikely(p == NULL)) 557 return htonl(NFS4ERR_RESOURCE); 558 *p++ = htonl(1); 559 *p++ = bm[0]; 560 } else { 561 p = xdr_reserve_space(xdr, 8); 562 if (unlikely(p == NULL)) 563 return htonl(NFS4ERR_RESOURCE); 564 *p++ = htonl(0); 565 } 566 *savep = p; 567 return 0; 568 } 569 570 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 571 { 572 __be32 *p; 573 574 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 575 return 0; 576 p = xdr_reserve_space(xdr, 8); 577 if (unlikely(!p)) 578 return htonl(NFS4ERR_RESOURCE); 579 p = xdr_encode_hyper(p, change); 580 return 0; 581 } 582 583 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 584 { 585 __be32 *p; 586 587 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 588 return 0; 589 p = xdr_reserve_space(xdr, 8); 590 if (unlikely(!p)) 591 return htonl(NFS4ERR_RESOURCE); 592 p = xdr_encode_hyper(p, size); 593 return 0; 594 } 595 596 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 597 { 598 __be32 *p; 599 600 p = xdr_reserve_space(xdr, 12); 601 if (unlikely(!p)) 602 return htonl(NFS4ERR_RESOURCE); 603 p = xdr_encode_hyper(p, time->tv_sec); 604 *p = htonl(time->tv_nsec); 605 return 0; 606 } 607 608 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 609 { 610 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 611 return 0; 612 return encode_attr_time(xdr,time); 613 } 614 615 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 616 { 617 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 618 return 0; 619 return encode_attr_time(xdr,time); 620 } 621 622 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 623 { 624 __be32 status; 625 626 hdr->status = xdr_reserve_space(xdr, 4); 627 if (unlikely(hdr->status == NULL)) 628 return htonl(NFS4ERR_RESOURCE); 629 status = encode_string(xdr, hdr->taglen, hdr->tag); 630 if (unlikely(status != 0)) 631 return status; 632 hdr->nops = xdr_reserve_space(xdr, 4); 633 if (unlikely(hdr->nops == NULL)) 634 return htonl(NFS4ERR_RESOURCE); 635 return 0; 636 } 637 638 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 639 { 640 __be32 *p; 641 642 p = xdr_reserve_space(xdr, 8); 643 if (unlikely(p == NULL)) 644 return htonl(NFS4ERR_RESOURCE_HDR); 645 *p++ = htonl(op); 646 *p = res; 647 return 0; 648 } 649 650 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, 651 const void *resp) 652 { 653 const struct cb_getattrres *res = resp; 654 __be32 *savep = NULL; 655 __be32 status = res->status; 656 657 if (unlikely(status != 0)) 658 goto out; 659 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 660 if (unlikely(status != 0)) 661 goto out; 662 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 663 if (unlikely(status != 0)) 664 goto out; 665 status = encode_attr_size(xdr, res->bitmap, res->size); 666 if (unlikely(status != 0)) 667 goto out; 668 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 669 if (unlikely(status != 0)) 670 goto out; 671 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 672 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 673 out: 674 return status; 675 } 676 677 #if defined(CONFIG_NFS_V4_1) 678 679 static __be32 encode_sessionid(struct xdr_stream *xdr, 680 const struct nfs4_sessionid *sid) 681 { 682 __be32 *p; 683 684 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 685 if (unlikely(p == NULL)) 686 return htonl(NFS4ERR_RESOURCE); 687 688 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 689 return 0; 690 } 691 692 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 693 struct xdr_stream *xdr, 694 const void *resp) 695 { 696 const struct cb_sequenceres *res = resp; 697 __be32 *p; 698 __be32 status = res->csr_status; 699 700 if (unlikely(status != 0)) 701 return status; 702 703 status = encode_sessionid(xdr, &res->csr_sessionid); 704 if (status) 705 return status; 706 707 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 708 if (unlikely(p == NULL)) 709 return htonl(NFS4ERR_RESOURCE); 710 711 *p++ = htonl(res->csr_sequenceid); 712 *p++ = htonl(res->csr_slotid); 713 *p++ = htonl(res->csr_highestslotid); 714 *p++ = htonl(res->csr_target_highestslotid); 715 return 0; 716 } 717 718 static __be32 719 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 720 { 721 if (op_nr == OP_CB_SEQUENCE) { 722 if (nop != 0) 723 return htonl(NFS4ERR_SEQUENCE_POS); 724 } else { 725 if (nop == 0) 726 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 727 } 728 729 switch (op_nr) { 730 case OP_CB_GETATTR: 731 case OP_CB_RECALL: 732 case OP_CB_SEQUENCE: 733 case OP_CB_RECALL_ANY: 734 case OP_CB_RECALL_SLOT: 735 case OP_CB_LAYOUTRECALL: 736 case OP_CB_NOTIFY_DEVICEID: 737 case OP_CB_NOTIFY_LOCK: 738 *op = &callback_ops[op_nr]; 739 break; 740 741 case OP_CB_NOTIFY: 742 case OP_CB_PUSH_DELEG: 743 case OP_CB_RECALLABLE_OBJ_AVAIL: 744 case OP_CB_WANTS_CANCELLED: 745 return htonl(NFS4ERR_NOTSUPP); 746 747 default: 748 return htonl(NFS4ERR_OP_ILLEGAL); 749 } 750 751 return htonl(NFS_OK); 752 } 753 754 static void nfs4_callback_free_slot(struct nfs4_session *session, 755 struct nfs4_slot *slot) 756 { 757 struct nfs4_slot_table *tbl = &session->bc_slot_table; 758 759 spin_lock(&tbl->slot_tbl_lock); 760 /* 761 * Let the state manager know callback processing done. 762 * A single slot, so highest used slotid is either 0 or -1 763 */ 764 nfs4_free_slot(tbl, slot); 765 spin_unlock(&tbl->slot_tbl_lock); 766 } 767 768 static void nfs4_cb_free_slot(struct cb_process_state *cps) 769 { 770 if (cps->slot) { 771 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 772 cps->slot = NULL; 773 } 774 } 775 776 #else /* CONFIG_NFS_V4_1 */ 777 778 static __be32 779 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 780 { 781 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 782 } 783 784 static void nfs4_cb_free_slot(struct cb_process_state *cps) 785 { 786 } 787 #endif /* CONFIG_NFS_V4_1 */ 788 789 #ifdef CONFIG_NFS_V4_2 790 static __be32 791 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 792 { 793 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 794 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 795 return status; 796 797 if (op_nr == OP_CB_OFFLOAD) 798 return htonl(NFS4ERR_NOTSUPP); 799 return htonl(NFS4ERR_OP_ILLEGAL); 800 } 801 #else /* CONFIG_NFS_V4_2 */ 802 static __be32 803 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 804 { 805 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 806 } 807 #endif /* CONFIG_NFS_V4_2 */ 808 809 static __be32 810 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 811 { 812 switch (op_nr) { 813 case OP_CB_GETATTR: 814 case OP_CB_RECALL: 815 *op = &callback_ops[op_nr]; 816 break; 817 default: 818 return htonl(NFS4ERR_OP_ILLEGAL); 819 } 820 821 return htonl(NFS_OK); 822 } 823 824 static __be32 process_op(int nop, struct svc_rqst *rqstp, 825 struct xdr_stream *xdr_in, void *argp, 826 struct xdr_stream *xdr_out, void *resp, 827 struct cb_process_state *cps) 828 { 829 struct callback_op *op = &callback_ops[0]; 830 unsigned int op_nr; 831 __be32 status; 832 long maxlen; 833 __be32 res; 834 835 status = decode_op_hdr(xdr_in, &op_nr); 836 if (unlikely(status)) 837 return status; 838 839 switch (cps->minorversion) { 840 case 0: 841 status = preprocess_nfs4_op(op_nr, &op); 842 break; 843 case 1: 844 status = preprocess_nfs41_op(nop, op_nr, &op); 845 break; 846 case 2: 847 status = preprocess_nfs42_op(nop, op_nr, &op); 848 break; 849 default: 850 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 851 } 852 853 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 854 op_nr = OP_CB_ILLEGAL; 855 if (status) 856 goto encode_hdr; 857 858 if (cps->drc_status) { 859 status = cps->drc_status; 860 goto encode_hdr; 861 } 862 863 maxlen = xdr_out->end - xdr_out->p; 864 if (maxlen > 0 && maxlen < PAGE_SIZE) { 865 status = op->decode_args(rqstp, xdr_in, argp); 866 if (likely(status == 0)) 867 status = op->process_op(argp, resp, cps); 868 } else 869 status = htonl(NFS4ERR_RESOURCE); 870 871 encode_hdr: 872 res = encode_op_hdr(xdr_out, op_nr, status); 873 if (unlikely(res)) 874 return res; 875 if (op->encode_res != NULL && status == 0) 876 status = op->encode_res(rqstp, xdr_out, resp); 877 return status; 878 } 879 880 /* 881 * Decode, process and encode a COMPOUND 882 */ 883 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp) 884 { 885 struct cb_compound_hdr_arg hdr_arg = { 0 }; 886 struct cb_compound_hdr_res hdr_res = { NULL }; 887 struct xdr_stream xdr_in, xdr_out; 888 __be32 *p, status; 889 struct cb_process_state cps = { 890 .drc_status = 0, 891 .clp = NULL, 892 .net = SVC_NET(rqstp), 893 }; 894 unsigned int nops = 0; 895 896 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 897 898 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 899 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 900 901 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 902 if (status == htonl(NFS4ERR_RESOURCE)) 903 return rpc_garbage_args; 904 905 if (hdr_arg.minorversion == 0) { 906 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 907 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 908 goto out_invalidcred; 909 } 910 911 cps.minorversion = hdr_arg.minorversion; 912 hdr_res.taglen = hdr_arg.taglen; 913 hdr_res.tag = hdr_arg.tag; 914 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 915 return rpc_system_err; 916 917 while (status == 0 && nops != hdr_arg.nops) { 918 status = process_op(nops, rqstp, &xdr_in, 919 rqstp->rq_argp, &xdr_out, rqstp->rq_resp, 920 &cps); 921 nops++; 922 } 923 924 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 925 * resource error in cb_compound status without returning op */ 926 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 927 status = htonl(NFS4ERR_RESOURCE); 928 nops--; 929 } 930 931 *hdr_res.status = status; 932 *hdr_res.nops = htonl(nops); 933 nfs4_cb_free_slot(&cps); 934 nfs_put_client(cps.clp); 935 return rpc_success; 936 937 out_invalidcred: 938 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 939 return rpc_autherr_badcred; 940 } 941 942 /* 943 * Define NFS4 callback COMPOUND ops. 944 */ 945 static struct callback_op callback_ops[] = { 946 [0] = { 947 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 948 }, 949 [OP_CB_GETATTR] = { 950 .process_op = nfs4_callback_getattr, 951 .decode_args = decode_getattr_args, 952 .encode_res = encode_getattr_res, 953 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 954 }, 955 [OP_CB_RECALL] = { 956 .process_op = nfs4_callback_recall, 957 .decode_args = decode_recall_args, 958 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 959 }, 960 #if defined(CONFIG_NFS_V4_1) 961 [OP_CB_LAYOUTRECALL] = { 962 .process_op = nfs4_callback_layoutrecall, 963 .decode_args = decode_layoutrecall_args, 964 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 965 }, 966 [OP_CB_NOTIFY_DEVICEID] = { 967 .process_op = nfs4_callback_devicenotify, 968 .decode_args = decode_devicenotify_args, 969 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 970 }, 971 [OP_CB_SEQUENCE] = { 972 .process_op = nfs4_callback_sequence, 973 .decode_args = decode_cb_sequence_args, 974 .encode_res = encode_cb_sequence_res, 975 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 976 }, 977 [OP_CB_RECALL_ANY] = { 978 .process_op = nfs4_callback_recallany, 979 .decode_args = decode_recallany_args, 980 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 981 }, 982 [OP_CB_RECALL_SLOT] = { 983 .process_op = nfs4_callback_recallslot, 984 .decode_args = decode_recallslot_args, 985 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 986 }, 987 [OP_CB_NOTIFY_LOCK] = { 988 .process_op = nfs4_callback_notify_lock, 989 .decode_args = decode_notify_lock_args, 990 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 991 }, 992 #endif /* CONFIG_NFS_V4_1 */ 993 }; 994 995 /* 996 * Define NFS4 callback procedures 997 */ 998 static const struct svc_procedure nfs4_callback_procedures1[] = { 999 [CB_NULL] = { 1000 .pc_func = nfs4_callback_null, 1001 .pc_decode = nfs4_decode_void, 1002 .pc_encode = nfs4_encode_void, 1003 .pc_xdrressize = 1, 1004 }, 1005 [CB_COMPOUND] = { 1006 .pc_func = nfs4_callback_compound, 1007 .pc_encode = nfs4_encode_void, 1008 .pc_argsize = 256, 1009 .pc_ressize = 256, 1010 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1011 } 1012 }; 1013 1014 static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]; 1015 const struct svc_version nfs4_callback_version1 = { 1016 .vs_vers = 1, 1017 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1018 .vs_proc = nfs4_callback_procedures1, 1019 .vs_count = nfs4_callback_count1, 1020 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1021 .vs_dispatch = NULL, 1022 .vs_hidden = true, 1023 .vs_need_cong_ctrl = true, 1024 }; 1025 1026 static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]; 1027 const struct svc_version nfs4_callback_version4 = { 1028 .vs_vers = 4, 1029 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1030 .vs_proc = nfs4_callback_procedures1, 1031 .vs_count = nfs4_callback_count4, 1032 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1033 .vs_dispatch = NULL, 1034 .vs_hidden = true, 1035 .vs_need_cong_ctrl = true, 1036 }; 1037