1 /* 2 * linux/fs/nfs/callback_xdr.c 3 * 4 * Copyright (C) 2004 Trond Myklebust 5 * 6 * NFSv4 callback encode/decode procedures 7 */ 8 #include <linux/kernel.h> 9 #include <linux/sunrpc/svc.h> 10 #include <linux/nfs4.h> 11 #include <linux/nfs_fs.h> 12 #include <linux/ratelimit.h> 13 #include <linux/printk.h> 14 #include <linux/slab.h> 15 #include <linux/sunrpc/bc_xprt.h> 16 #include "nfs4_fs.h" 17 #include "callback.h" 18 #include "internal.h" 19 #include "nfs4session.h" 20 21 #define CB_OP_TAGLEN_MAXSZ (512) 22 #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status 23 #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps 24 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 25 CB_OP_GETATTR_BITMAP_MAXSZ + \ 26 /* change, size, ctime, mtime */\ 27 (2 + 2 + 3 + 3) * 4) 28 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 29 30 #if defined(CONFIG_NFS_V4_1) 31 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 32 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 33 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 34 NFS4_MAX_SESSIONID_LEN + \ 35 (1 + 3) * 4) // seqid, 3 slotids 36 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 37 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 38 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 39 #endif /* CONFIG_NFS_V4_1 */ 40 41 #define NFSDBG_FACILITY NFSDBG_CALLBACK 42 43 /* Internal error code */ 44 #define NFS4ERR_RESOURCE_HDR 11050 45 46 typedef __be32 (*callback_process_op_t)(void *, void *, 47 struct cb_process_state *); 48 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 49 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 50 51 52 struct callback_op { 53 callback_process_op_t process_op; 54 callback_decode_arg_t decode_args; 55 callback_encode_res_t encode_res; 56 long res_maxsize; 57 }; 58 59 static struct callback_op callback_ops[]; 60 61 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 62 { 63 return htonl(NFS4_OK); 64 } 65 66 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 67 { 68 return xdr_argsize_check(rqstp, p); 69 } 70 71 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 72 { 73 return xdr_ressize_check(rqstp, p); 74 } 75 76 static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes) 77 { 78 __be32 *p; 79 80 p = xdr_inline_decode(xdr, nbytes); 81 if (unlikely(p == NULL)) 82 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n"); 83 return p; 84 } 85 86 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, 87 const char **str, size_t maxlen) 88 { 89 ssize_t err; 90 91 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen); 92 if (err < 0) 93 return cpu_to_be32(NFS4ERR_RESOURCE); 94 *len = err; 95 return 0; 96 } 97 98 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 99 { 100 __be32 *p; 101 102 p = read_buf(xdr, 4); 103 if (unlikely(p == NULL)) 104 return htonl(NFS4ERR_RESOURCE); 105 fh->size = ntohl(*p); 106 if (fh->size > NFS4_FHSIZE) 107 return htonl(NFS4ERR_BADHANDLE); 108 p = read_buf(xdr, fh->size); 109 if (unlikely(p == NULL)) 110 return htonl(NFS4ERR_RESOURCE); 111 memcpy(&fh->data[0], p, fh->size); 112 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 113 return 0; 114 } 115 116 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 117 { 118 __be32 *p; 119 unsigned int attrlen; 120 121 p = read_buf(xdr, 4); 122 if (unlikely(p == NULL)) 123 return htonl(NFS4ERR_RESOURCE); 124 attrlen = ntohl(*p); 125 p = read_buf(xdr, attrlen << 2); 126 if (unlikely(p == NULL)) 127 return htonl(NFS4ERR_RESOURCE); 128 if (likely(attrlen > 0)) 129 bitmap[0] = ntohl(*p++); 130 if (attrlen > 1) 131 bitmap[1] = ntohl(*p); 132 return 0; 133 } 134 135 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 136 { 137 __be32 *p; 138 139 p = read_buf(xdr, NFS4_STATEID_SIZE); 140 if (unlikely(p == NULL)) 141 return htonl(NFS4ERR_RESOURCE); 142 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 143 return 0; 144 } 145 146 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 147 { 148 stateid->type = NFS4_DELEGATION_STATEID_TYPE; 149 return decode_stateid(xdr, stateid); 150 } 151 152 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 153 { 154 __be32 *p; 155 __be32 status; 156 157 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ); 158 if (unlikely(status != 0)) 159 return status; 160 p = read_buf(xdr, 12); 161 if (unlikely(p == NULL)) 162 return htonl(NFS4ERR_RESOURCE); 163 hdr->minorversion = ntohl(*p++); 164 /* Check for minor version support */ 165 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) { 166 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */ 167 } else { 168 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with " 169 "illegal minor version %u!\n", 170 __func__, hdr->minorversion); 171 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 172 } 173 hdr->nops = ntohl(*p); 174 return 0; 175 } 176 177 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 178 { 179 __be32 *p; 180 p = read_buf(xdr, 4); 181 if (unlikely(p == NULL)) 182 return htonl(NFS4ERR_RESOURCE_HDR); 183 *op = ntohl(*p); 184 return 0; 185 } 186 187 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 188 { 189 __be32 status; 190 191 status = decode_fh(xdr, &args->fh); 192 if (unlikely(status != 0)) 193 return status; 194 return decode_bitmap(xdr, args->bitmap); 195 } 196 197 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 198 { 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, 221 struct cb_layoutrecallargs *args) 222 { 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 struct cb_devicenotifyargs *args) 266 { 267 __be32 *p; 268 __be32 status = 0; 269 u32 tmp; 270 int n, i; 271 args->ndevs = 0; 272 273 /* Num of device notifications */ 274 p = read_buf(xdr, sizeof(uint32_t)); 275 if (unlikely(p == NULL)) { 276 status = htonl(NFS4ERR_BADXDR); 277 goto out; 278 } 279 n = ntohl(*p++); 280 if (n <= 0) 281 goto out; 282 if (n > ULONG_MAX / sizeof(*args->devs)) { 283 status = htonl(NFS4ERR_BADXDR); 284 goto out; 285 } 286 287 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL); 288 if (!args->devs) { 289 status = htonl(NFS4ERR_DELAY); 290 goto out; 291 } 292 293 /* Decode each dev notification */ 294 for (i = 0; i < n; i++) { 295 struct cb_devicenotifyitem *dev = &args->devs[i]; 296 297 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE); 298 if (unlikely(p == NULL)) { 299 status = htonl(NFS4ERR_BADXDR); 300 goto err; 301 } 302 303 tmp = ntohl(*p++); /* bitmap size */ 304 if (tmp != 1) { 305 status = htonl(NFS4ERR_INVAL); 306 goto err; 307 } 308 dev->cbd_notify_type = ntohl(*p++); 309 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 310 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 311 status = htonl(NFS4ERR_INVAL); 312 goto err; 313 } 314 315 tmp = ntohl(*p++); /* opaque size */ 316 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 317 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 318 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 319 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 320 status = htonl(NFS4ERR_INVAL); 321 goto err; 322 } 323 dev->cbd_layout_type = ntohl(*p++); 324 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 325 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 326 327 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 328 p = read_buf(xdr, sizeof(uint32_t)); 329 if (unlikely(p == NULL)) { 330 status = htonl(NFS4ERR_BADXDR); 331 goto err; 332 } 333 dev->cbd_immediate = ntohl(*p++); 334 } else { 335 dev->cbd_immediate = 0; 336 } 337 338 args->ndevs++; 339 340 dprintk("%s: type %d layout 0x%x immediate %d\n", 341 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 342 dev->cbd_immediate); 343 } 344 out: 345 dprintk("%s: status %d ndevs %d\n", 346 __func__, ntohl(status), args->ndevs); 347 return status; 348 err: 349 kfree(args->devs); 350 goto out; 351 } 352 353 static __be32 decode_sessionid(struct xdr_stream *xdr, 354 struct nfs4_sessionid *sid) 355 { 356 __be32 *p; 357 358 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN); 359 if (unlikely(p == NULL)) 360 return htonl(NFS4ERR_RESOURCE); 361 362 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN); 363 return 0; 364 } 365 366 static __be32 decode_rc_list(struct xdr_stream *xdr, 367 struct referring_call_list *rc_list) 368 { 369 __be32 *p; 370 int i; 371 __be32 status; 372 373 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 374 if (status) 375 goto out; 376 377 status = htonl(NFS4ERR_RESOURCE); 378 p = read_buf(xdr, sizeof(uint32_t)); 379 if (unlikely(p == NULL)) 380 goto out; 381 382 rc_list->rcl_nrefcalls = ntohl(*p++); 383 if (rc_list->rcl_nrefcalls) { 384 p = read_buf(xdr, 385 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 386 if (unlikely(p == NULL)) 387 goto out; 388 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls, 389 sizeof(*rc_list->rcl_refcalls), 390 GFP_KERNEL); 391 if (unlikely(rc_list->rcl_refcalls == NULL)) 392 goto out; 393 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 394 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 395 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 396 } 397 } 398 status = 0; 399 400 out: 401 return status; 402 } 403 404 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 405 struct xdr_stream *xdr, 406 struct cb_sequenceargs *args) 407 { 408 __be32 *p; 409 int i; 410 __be32 status; 411 412 status = decode_sessionid(xdr, &args->csa_sessionid); 413 if (status) 414 return status; 415 416 p = read_buf(xdr, 5 * sizeof(uint32_t)); 417 if (unlikely(p == NULL)) 418 return htonl(NFS4ERR_RESOURCE); 419 420 args->csa_addr = svc_addr(rqstp); 421 args->csa_sequenceid = ntohl(*p++); 422 args->csa_slotid = ntohl(*p++); 423 args->csa_highestslotid = ntohl(*p++); 424 args->csa_cachethis = ntohl(*p++); 425 args->csa_nrclists = ntohl(*p++); 426 args->csa_rclists = NULL; 427 if (args->csa_nrclists) { 428 args->csa_rclists = kmalloc_array(args->csa_nrclists, 429 sizeof(*args->csa_rclists), 430 GFP_KERNEL); 431 if (unlikely(args->csa_rclists == NULL)) 432 return htonl(NFS4ERR_RESOURCE); 433 434 for (i = 0; i < args->csa_nrclists; i++) { 435 status = decode_rc_list(xdr, &args->csa_rclists[i]); 436 if (status) { 437 args->csa_nrclists = i; 438 goto out_free; 439 } 440 } 441 } 442 return 0; 443 444 out_free: 445 for (i = 0; i < args->csa_nrclists; i++) 446 kfree(args->csa_rclists[i].rcl_refcalls); 447 kfree(args->csa_rclists); 448 return status; 449 } 450 451 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 452 struct xdr_stream *xdr, 453 struct cb_recallanyargs *args) 454 { 455 uint32_t bitmap[2]; 456 __be32 *p, status; 457 458 p = read_buf(xdr, 4); 459 if (unlikely(p == NULL)) 460 return htonl(NFS4ERR_BADXDR); 461 args->craa_objs_to_keep = ntohl(*p++); 462 status = decode_bitmap(xdr, bitmap); 463 if (unlikely(status)) 464 return status; 465 args->craa_type_mask = bitmap[0]; 466 467 return 0; 468 } 469 470 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 471 struct xdr_stream *xdr, 472 struct cb_recallslotargs *args) 473 { 474 __be32 *p; 475 476 p = read_buf(xdr, 4); 477 if (unlikely(p == NULL)) 478 return htonl(NFS4ERR_BADXDR); 479 args->crsa_target_highest_slotid = ntohl(*p++); 480 return 0; 481 } 482 483 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) 484 { 485 __be32 *p; 486 unsigned int len; 487 488 p = read_buf(xdr, 12); 489 if (unlikely(p == NULL)) 490 return htonl(NFS4ERR_BADXDR); 491 492 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); 493 len = be32_to_cpu(*p); 494 495 p = read_buf(xdr, len); 496 if (unlikely(p == NULL)) 497 return htonl(NFS4ERR_BADXDR); 498 499 /* Only try to decode if the length is right */ 500 if (len == 20) { 501 p += 2; /* skip "lock id:" */ 502 args->cbnl_owner.s_dev = be32_to_cpu(*p++); 503 xdr_decode_hyper(p, &args->cbnl_owner.id); 504 args->cbnl_valid = true; 505 } else { 506 args->cbnl_owner.s_dev = 0; 507 args->cbnl_owner.id = 0; 508 args->cbnl_valid = false; 509 } 510 return 0; 511 } 512 513 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_notify_lock_args *args) 514 { 515 __be32 status; 516 517 status = decode_fh(xdr, &args->cbnl_fh); 518 if (unlikely(status != 0)) 519 return status; 520 return decode_lockowner(xdr, args); 521 } 522 523 #endif /* CONFIG_NFS_V4_1 */ 524 525 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 526 { 527 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 528 return cpu_to_be32(NFS4ERR_RESOURCE); 529 return 0; 530 } 531 532 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 533 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 534 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 535 { 536 __be32 bm[2]; 537 __be32 *p; 538 539 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 540 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 541 if (bm[1] != 0) { 542 p = xdr_reserve_space(xdr, 16); 543 if (unlikely(p == NULL)) 544 return htonl(NFS4ERR_RESOURCE); 545 *p++ = htonl(2); 546 *p++ = bm[0]; 547 *p++ = bm[1]; 548 } else if (bm[0] != 0) { 549 p = xdr_reserve_space(xdr, 12); 550 if (unlikely(p == NULL)) 551 return htonl(NFS4ERR_RESOURCE); 552 *p++ = htonl(1); 553 *p++ = bm[0]; 554 } else { 555 p = xdr_reserve_space(xdr, 8); 556 if (unlikely(p == NULL)) 557 return htonl(NFS4ERR_RESOURCE); 558 *p++ = htonl(0); 559 } 560 *savep = p; 561 return 0; 562 } 563 564 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 565 { 566 __be32 *p; 567 568 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 569 return 0; 570 p = xdr_reserve_space(xdr, 8); 571 if (unlikely(!p)) 572 return htonl(NFS4ERR_RESOURCE); 573 p = xdr_encode_hyper(p, change); 574 return 0; 575 } 576 577 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 578 { 579 __be32 *p; 580 581 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 582 return 0; 583 p = xdr_reserve_space(xdr, 8); 584 if (unlikely(!p)) 585 return htonl(NFS4ERR_RESOURCE); 586 p = xdr_encode_hyper(p, size); 587 return 0; 588 } 589 590 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 591 { 592 __be32 *p; 593 594 p = xdr_reserve_space(xdr, 12); 595 if (unlikely(!p)) 596 return htonl(NFS4ERR_RESOURCE); 597 p = xdr_encode_hyper(p, time->tv_sec); 598 *p = htonl(time->tv_nsec); 599 return 0; 600 } 601 602 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 603 { 604 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 605 return 0; 606 return encode_attr_time(xdr,time); 607 } 608 609 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 610 { 611 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 612 return 0; 613 return encode_attr_time(xdr,time); 614 } 615 616 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 617 { 618 __be32 status; 619 620 hdr->status = xdr_reserve_space(xdr, 4); 621 if (unlikely(hdr->status == NULL)) 622 return htonl(NFS4ERR_RESOURCE); 623 status = encode_string(xdr, hdr->taglen, hdr->tag); 624 if (unlikely(status != 0)) 625 return status; 626 hdr->nops = xdr_reserve_space(xdr, 4); 627 if (unlikely(hdr->nops == NULL)) 628 return htonl(NFS4ERR_RESOURCE); 629 return 0; 630 } 631 632 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 633 { 634 __be32 *p; 635 636 p = xdr_reserve_space(xdr, 8); 637 if (unlikely(p == NULL)) 638 return htonl(NFS4ERR_RESOURCE_HDR); 639 *p++ = htonl(op); 640 *p = res; 641 return 0; 642 } 643 644 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 645 { 646 __be32 *savep = NULL; 647 __be32 status = res->status; 648 649 if (unlikely(status != 0)) 650 goto out; 651 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 652 if (unlikely(status != 0)) 653 goto out; 654 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 655 if (unlikely(status != 0)) 656 goto out; 657 status = encode_attr_size(xdr, res->bitmap, res->size); 658 if (unlikely(status != 0)) 659 goto out; 660 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 661 if (unlikely(status != 0)) 662 goto out; 663 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 664 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 665 out: 666 return status; 667 } 668 669 #if defined(CONFIG_NFS_V4_1) 670 671 static __be32 encode_sessionid(struct xdr_stream *xdr, 672 const struct nfs4_sessionid *sid) 673 { 674 __be32 *p; 675 676 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 677 if (unlikely(p == NULL)) 678 return htonl(NFS4ERR_RESOURCE); 679 680 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 681 return 0; 682 } 683 684 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 685 struct xdr_stream *xdr, 686 const struct cb_sequenceres *res) 687 { 688 __be32 *p; 689 __be32 status = res->csr_status; 690 691 if (unlikely(status != 0)) 692 return status; 693 694 status = encode_sessionid(xdr, &res->csr_sessionid); 695 if (status) 696 return status; 697 698 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 699 if (unlikely(p == NULL)) 700 return htonl(NFS4ERR_RESOURCE); 701 702 *p++ = htonl(res->csr_sequenceid); 703 *p++ = htonl(res->csr_slotid); 704 *p++ = htonl(res->csr_highestslotid); 705 *p++ = htonl(res->csr_target_highestslotid); 706 return 0; 707 } 708 709 static __be32 710 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 711 { 712 if (op_nr == OP_CB_SEQUENCE) { 713 if (nop != 0) 714 return htonl(NFS4ERR_SEQUENCE_POS); 715 } else { 716 if (nop == 0) 717 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 718 } 719 720 switch (op_nr) { 721 case OP_CB_GETATTR: 722 case OP_CB_RECALL: 723 case OP_CB_SEQUENCE: 724 case OP_CB_RECALL_ANY: 725 case OP_CB_RECALL_SLOT: 726 case OP_CB_LAYOUTRECALL: 727 case OP_CB_NOTIFY_DEVICEID: 728 case OP_CB_NOTIFY_LOCK: 729 *op = &callback_ops[op_nr]; 730 break; 731 732 case OP_CB_NOTIFY: 733 case OP_CB_PUSH_DELEG: 734 case OP_CB_RECALLABLE_OBJ_AVAIL: 735 case OP_CB_WANTS_CANCELLED: 736 return htonl(NFS4ERR_NOTSUPP); 737 738 default: 739 return htonl(NFS4ERR_OP_ILLEGAL); 740 } 741 742 return htonl(NFS_OK); 743 } 744 745 static void nfs4_callback_free_slot(struct nfs4_session *session, 746 struct nfs4_slot *slot) 747 { 748 struct nfs4_slot_table *tbl = &session->bc_slot_table; 749 750 spin_lock(&tbl->slot_tbl_lock); 751 /* 752 * Let the state manager know callback processing done. 753 * A single slot, so highest used slotid is either 0 or -1 754 */ 755 nfs4_free_slot(tbl, slot); 756 nfs4_slot_tbl_drain_complete(tbl); 757 spin_unlock(&tbl->slot_tbl_lock); 758 } 759 760 static void nfs4_cb_free_slot(struct cb_process_state *cps) 761 { 762 if (cps->slot) { 763 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 764 cps->slot = NULL; 765 } 766 } 767 768 #else /* CONFIG_NFS_V4_1 */ 769 770 static __be32 771 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 772 { 773 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 774 } 775 776 static void nfs4_cb_free_slot(struct cb_process_state *cps) 777 { 778 } 779 #endif /* CONFIG_NFS_V4_1 */ 780 781 #ifdef CONFIG_NFS_V4_2 782 static __be32 783 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 784 { 785 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 786 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 787 return status; 788 789 if (op_nr == OP_CB_OFFLOAD) 790 return htonl(NFS4ERR_NOTSUPP); 791 return htonl(NFS4ERR_OP_ILLEGAL); 792 } 793 #else /* CONFIG_NFS_V4_2 */ 794 static __be32 795 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 796 { 797 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 798 } 799 #endif /* CONFIG_NFS_V4_2 */ 800 801 static __be32 802 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 803 { 804 switch (op_nr) { 805 case OP_CB_GETATTR: 806 case OP_CB_RECALL: 807 *op = &callback_ops[op_nr]; 808 break; 809 default: 810 return htonl(NFS4ERR_OP_ILLEGAL); 811 } 812 813 return htonl(NFS_OK); 814 } 815 816 static __be32 process_op(int nop, struct svc_rqst *rqstp, 817 struct xdr_stream *xdr_in, void *argp, 818 struct xdr_stream *xdr_out, void *resp, 819 struct cb_process_state *cps) 820 { 821 struct callback_op *op = &callback_ops[0]; 822 unsigned int op_nr; 823 __be32 status; 824 long maxlen; 825 __be32 res; 826 827 status = decode_op_hdr(xdr_in, &op_nr); 828 if (unlikely(status)) 829 return status; 830 831 switch (cps->minorversion) { 832 case 0: 833 status = preprocess_nfs4_op(op_nr, &op); 834 break; 835 case 1: 836 status = preprocess_nfs41_op(nop, op_nr, &op); 837 break; 838 case 2: 839 status = preprocess_nfs42_op(nop, op_nr, &op); 840 break; 841 default: 842 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 843 } 844 845 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 846 op_nr = OP_CB_ILLEGAL; 847 if (status) 848 goto encode_hdr; 849 850 if (cps->drc_status) { 851 status = cps->drc_status; 852 goto encode_hdr; 853 } 854 855 maxlen = xdr_out->end - xdr_out->p; 856 if (maxlen > 0 && maxlen < PAGE_SIZE) { 857 status = op->decode_args(rqstp, xdr_in, argp); 858 if (likely(status == 0)) 859 status = op->process_op(argp, resp, cps); 860 } else 861 status = htonl(NFS4ERR_RESOURCE); 862 863 encode_hdr: 864 res = encode_op_hdr(xdr_out, op_nr, status); 865 if (unlikely(res)) 866 return res; 867 if (op->encode_res != NULL && status == 0) 868 status = op->encode_res(rqstp, xdr_out, resp); 869 return status; 870 } 871 872 /* 873 * Decode, process and encode a COMPOUND 874 */ 875 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 876 { 877 struct cb_compound_hdr_arg hdr_arg = { 0 }; 878 struct cb_compound_hdr_res hdr_res = { NULL }; 879 struct xdr_stream xdr_in, xdr_out; 880 __be32 *p, status; 881 struct cb_process_state cps = { 882 .drc_status = 0, 883 .clp = NULL, 884 .net = SVC_NET(rqstp), 885 }; 886 unsigned int nops = 0; 887 888 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 889 890 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 891 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 892 893 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 894 if (status == htonl(NFS4ERR_RESOURCE)) 895 return rpc_garbage_args; 896 897 if (hdr_arg.minorversion == 0) { 898 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 899 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 900 goto out_invalidcred; 901 } 902 903 cps.minorversion = hdr_arg.minorversion; 904 hdr_res.taglen = hdr_arg.taglen; 905 hdr_res.tag = hdr_arg.tag; 906 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 907 return rpc_system_err; 908 909 while (status == 0 && nops != hdr_arg.nops) { 910 status = process_op(nops, rqstp, &xdr_in, 911 argp, &xdr_out, resp, &cps); 912 nops++; 913 } 914 915 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 916 * resource error in cb_compound status without returning op */ 917 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 918 status = htonl(NFS4ERR_RESOURCE); 919 nops--; 920 } 921 922 *hdr_res.status = status; 923 *hdr_res.nops = htonl(nops); 924 nfs4_cb_free_slot(&cps); 925 nfs_put_client(cps.clp); 926 return rpc_success; 927 928 out_invalidcred: 929 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 930 return rpc_autherr_badcred; 931 } 932 933 /* 934 * Define NFS4 callback COMPOUND ops. 935 */ 936 static struct callback_op callback_ops[] = { 937 [0] = { 938 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 939 }, 940 [OP_CB_GETATTR] = { 941 .process_op = (callback_process_op_t)nfs4_callback_getattr, 942 .decode_args = (callback_decode_arg_t)decode_getattr_args, 943 .encode_res = (callback_encode_res_t)encode_getattr_res, 944 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 945 }, 946 [OP_CB_RECALL] = { 947 .process_op = (callback_process_op_t)nfs4_callback_recall, 948 .decode_args = (callback_decode_arg_t)decode_recall_args, 949 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 950 }, 951 #if defined(CONFIG_NFS_V4_1) 952 [OP_CB_LAYOUTRECALL] = { 953 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall, 954 .decode_args = 955 (callback_decode_arg_t)decode_layoutrecall_args, 956 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 957 }, 958 [OP_CB_NOTIFY_DEVICEID] = { 959 .process_op = (callback_process_op_t)nfs4_callback_devicenotify, 960 .decode_args = 961 (callback_decode_arg_t)decode_devicenotify_args, 962 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 963 }, 964 [OP_CB_SEQUENCE] = { 965 .process_op = (callback_process_op_t)nfs4_callback_sequence, 966 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 967 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 968 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 969 }, 970 [OP_CB_RECALL_ANY] = { 971 .process_op = (callback_process_op_t)nfs4_callback_recallany, 972 .decode_args = (callback_decode_arg_t)decode_recallany_args, 973 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 974 }, 975 [OP_CB_RECALL_SLOT] = { 976 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 977 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 978 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 979 }, 980 [OP_CB_NOTIFY_LOCK] = { 981 .process_op = (callback_process_op_t)nfs4_callback_notify_lock, 982 .decode_args = (callback_decode_arg_t)decode_notify_lock_args, 983 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 984 }, 985 #endif /* CONFIG_NFS_V4_1 */ 986 }; 987 988 /* 989 * Define NFS4 callback procedures 990 */ 991 static struct svc_procedure nfs4_callback_procedures1[] = { 992 [CB_NULL] = { 993 .pc_func = nfs4_callback_null, 994 .pc_decode = (kxdrproc_t)nfs4_decode_void, 995 .pc_encode = (kxdrproc_t)nfs4_encode_void, 996 .pc_xdrressize = 1, 997 }, 998 [CB_COMPOUND] = { 999 .pc_func = nfs4_callback_compound, 1000 .pc_encode = (kxdrproc_t)nfs4_encode_void, 1001 .pc_argsize = 256, 1002 .pc_ressize = 256, 1003 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1004 } 1005 }; 1006 1007 struct svc_version nfs4_callback_version1 = { 1008 .vs_vers = 1, 1009 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1010 .vs_proc = nfs4_callback_procedures1, 1011 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1012 .vs_dispatch = NULL, 1013 .vs_hidden = true, 1014 .vs_need_cong_ctrl = true, 1015 }; 1016 1017 struct svc_version nfs4_callback_version4 = { 1018 .vs_vers = 4, 1019 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1020 .vs_proc = nfs4_callback_procedures1, 1021 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1022 .vs_dispatch = NULL, 1023 .vs_hidden = true, 1024 .vs_need_cong_ctrl = true, 1025 }; 1026