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 dprintk("%s: minorversion %d nops %d\n", __func__, 175 hdr->minorversion, hdr->nops); 176 return 0; 177 } 178 179 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 180 { 181 __be32 *p; 182 p = read_buf(xdr, 4); 183 if (unlikely(p == NULL)) 184 return htonl(NFS4ERR_RESOURCE_HDR); 185 *op = ntohl(*p); 186 return 0; 187 } 188 189 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 190 { 191 __be32 status; 192 193 status = decode_fh(xdr, &args->fh); 194 if (unlikely(status != 0)) 195 goto out; 196 status = decode_bitmap(xdr, args->bitmap); 197 out: 198 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 199 return status; 200 } 201 202 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 203 { 204 __be32 *p; 205 __be32 status; 206 207 status = decode_delegation_stateid(xdr, &args->stateid); 208 if (unlikely(status != 0)) 209 goto out; 210 p = read_buf(xdr, 4); 211 if (unlikely(p == NULL)) { 212 status = htonl(NFS4ERR_RESOURCE); 213 goto out; 214 } 215 args->truncate = ntohl(*p); 216 status = decode_fh(xdr, &args->fh); 217 out: 218 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 219 return status; 220 } 221 222 #if defined(CONFIG_NFS_V4_1) 223 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 224 { 225 stateid->type = NFS4_LAYOUT_STATEID_TYPE; 226 return decode_stateid(xdr, stateid); 227 } 228 229 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 230 struct xdr_stream *xdr, 231 struct cb_layoutrecallargs *args) 232 { 233 __be32 *p; 234 __be32 status = 0; 235 uint32_t iomode; 236 237 p = read_buf(xdr, 4 * sizeof(uint32_t)); 238 if (unlikely(p == NULL)) { 239 status = htonl(NFS4ERR_BADXDR); 240 goto out; 241 } 242 243 args->cbl_layout_type = ntohl(*p++); 244 /* Depite the spec's xdr, iomode really belongs in the FILE switch, 245 * as it is unusable and ignored with the other types. 246 */ 247 iomode = ntohl(*p++); 248 args->cbl_layoutchanged = ntohl(*p++); 249 args->cbl_recall_type = ntohl(*p++); 250 251 if (args->cbl_recall_type == RETURN_FILE) { 252 args->cbl_range.iomode = iomode; 253 status = decode_fh(xdr, &args->cbl_fh); 254 if (unlikely(status != 0)) 255 goto out; 256 257 p = read_buf(xdr, 2 * sizeof(uint64_t)); 258 if (unlikely(p == NULL)) { 259 status = htonl(NFS4ERR_BADXDR); 260 goto out; 261 } 262 p = xdr_decode_hyper(p, &args->cbl_range.offset); 263 p = xdr_decode_hyper(p, &args->cbl_range.length); 264 status = decode_layout_stateid(xdr, &args->cbl_stateid); 265 if (unlikely(status != 0)) 266 goto out; 267 } else if (args->cbl_recall_type == RETURN_FSID) { 268 p = read_buf(xdr, 2 * sizeof(uint64_t)); 269 if (unlikely(p == NULL)) { 270 status = htonl(NFS4ERR_BADXDR); 271 goto out; 272 } 273 p = xdr_decode_hyper(p, &args->cbl_fsid.major); 274 p = xdr_decode_hyper(p, &args->cbl_fsid.minor); 275 } else if (args->cbl_recall_type != RETURN_ALL) { 276 status = htonl(NFS4ERR_BADXDR); 277 goto out; 278 } 279 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n", 280 __func__, 281 args->cbl_layout_type, iomode, 282 args->cbl_layoutchanged, args->cbl_recall_type); 283 out: 284 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 285 return status; 286 } 287 288 static 289 __be32 decode_devicenotify_args(struct svc_rqst *rqstp, 290 struct xdr_stream *xdr, 291 struct cb_devicenotifyargs *args) 292 { 293 __be32 *p; 294 __be32 status = 0; 295 u32 tmp; 296 int n, i; 297 args->ndevs = 0; 298 299 /* Num of device notifications */ 300 p = read_buf(xdr, sizeof(uint32_t)); 301 if (unlikely(p == NULL)) { 302 status = htonl(NFS4ERR_BADXDR); 303 goto out; 304 } 305 n = ntohl(*p++); 306 if (n <= 0) 307 goto out; 308 if (n > ULONG_MAX / sizeof(*args->devs)) { 309 status = htonl(NFS4ERR_BADXDR); 310 goto out; 311 } 312 313 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL); 314 if (!args->devs) { 315 status = htonl(NFS4ERR_DELAY); 316 goto out; 317 } 318 319 /* Decode each dev notification */ 320 for (i = 0; i < n; i++) { 321 struct cb_devicenotifyitem *dev = &args->devs[i]; 322 323 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE); 324 if (unlikely(p == NULL)) { 325 status = htonl(NFS4ERR_BADXDR); 326 goto err; 327 } 328 329 tmp = ntohl(*p++); /* bitmap size */ 330 if (tmp != 1) { 331 status = htonl(NFS4ERR_INVAL); 332 goto err; 333 } 334 dev->cbd_notify_type = ntohl(*p++); 335 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 336 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 337 status = htonl(NFS4ERR_INVAL); 338 goto err; 339 } 340 341 tmp = ntohl(*p++); /* opaque size */ 342 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 343 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 344 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 345 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 346 status = htonl(NFS4ERR_INVAL); 347 goto err; 348 } 349 dev->cbd_layout_type = ntohl(*p++); 350 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 351 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 352 353 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 354 p = read_buf(xdr, sizeof(uint32_t)); 355 if (unlikely(p == NULL)) { 356 status = htonl(NFS4ERR_BADXDR); 357 goto err; 358 } 359 dev->cbd_immediate = ntohl(*p++); 360 } else { 361 dev->cbd_immediate = 0; 362 } 363 364 args->ndevs++; 365 366 dprintk("%s: type %d layout 0x%x immediate %d\n", 367 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 368 dev->cbd_immediate); 369 } 370 out: 371 dprintk("%s: status %d ndevs %d\n", 372 __func__, ntohl(status), args->ndevs); 373 return status; 374 err: 375 kfree(args->devs); 376 goto out; 377 } 378 379 static __be32 decode_sessionid(struct xdr_stream *xdr, 380 struct nfs4_sessionid *sid) 381 { 382 __be32 *p; 383 384 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN); 385 if (unlikely(p == NULL)) 386 return htonl(NFS4ERR_RESOURCE); 387 388 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN); 389 return 0; 390 } 391 392 static __be32 decode_rc_list(struct xdr_stream *xdr, 393 struct referring_call_list *rc_list) 394 { 395 __be32 *p; 396 int i; 397 __be32 status; 398 399 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 400 if (status) 401 goto out; 402 403 status = htonl(NFS4ERR_RESOURCE); 404 p = read_buf(xdr, sizeof(uint32_t)); 405 if (unlikely(p == NULL)) 406 goto out; 407 408 rc_list->rcl_nrefcalls = ntohl(*p++); 409 if (rc_list->rcl_nrefcalls) { 410 p = read_buf(xdr, 411 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 412 if (unlikely(p == NULL)) 413 goto out; 414 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls, 415 sizeof(*rc_list->rcl_refcalls), 416 GFP_KERNEL); 417 if (unlikely(rc_list->rcl_refcalls == NULL)) 418 goto out; 419 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 420 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 421 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 422 } 423 } 424 status = 0; 425 426 out: 427 return status; 428 } 429 430 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 431 struct xdr_stream *xdr, 432 struct cb_sequenceargs *args) 433 { 434 __be32 *p; 435 int i; 436 __be32 status; 437 438 status = decode_sessionid(xdr, &args->csa_sessionid); 439 if (status) 440 goto out; 441 442 status = htonl(NFS4ERR_RESOURCE); 443 p = read_buf(xdr, 5 * sizeof(uint32_t)); 444 if (unlikely(p == NULL)) 445 goto out; 446 447 args->csa_addr = svc_addr(rqstp); 448 args->csa_sequenceid = ntohl(*p++); 449 args->csa_slotid = ntohl(*p++); 450 args->csa_highestslotid = ntohl(*p++); 451 args->csa_cachethis = ntohl(*p++); 452 args->csa_nrclists = ntohl(*p++); 453 args->csa_rclists = NULL; 454 if (args->csa_nrclists) { 455 args->csa_rclists = kmalloc_array(args->csa_nrclists, 456 sizeof(*args->csa_rclists), 457 GFP_KERNEL); 458 if (unlikely(args->csa_rclists == NULL)) 459 goto out; 460 461 for (i = 0; i < args->csa_nrclists; i++) { 462 status = decode_rc_list(xdr, &args->csa_rclists[i]); 463 if (status) { 464 args->csa_nrclists = i; 465 goto out_free; 466 } 467 } 468 } 469 status = 0; 470 471 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 472 "highestslotid %u cachethis %d nrclists %u\n", 473 __func__, 474 ((u32 *)&args->csa_sessionid)[0], 475 ((u32 *)&args->csa_sessionid)[1], 476 ((u32 *)&args->csa_sessionid)[2], 477 ((u32 *)&args->csa_sessionid)[3], 478 args->csa_sequenceid, args->csa_slotid, 479 args->csa_highestslotid, args->csa_cachethis, 480 args->csa_nrclists); 481 out: 482 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 483 return status; 484 485 out_free: 486 for (i = 0; i < args->csa_nrclists; i++) 487 kfree(args->csa_rclists[i].rcl_refcalls); 488 kfree(args->csa_rclists); 489 goto out; 490 } 491 492 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 493 struct xdr_stream *xdr, 494 struct cb_recallanyargs *args) 495 { 496 uint32_t bitmap[2]; 497 __be32 *p, status; 498 499 p = read_buf(xdr, 4); 500 if (unlikely(p == NULL)) 501 return htonl(NFS4ERR_BADXDR); 502 args->craa_objs_to_keep = ntohl(*p++); 503 status = decode_bitmap(xdr, bitmap); 504 if (unlikely(status)) 505 return status; 506 args->craa_type_mask = bitmap[0]; 507 508 return 0; 509 } 510 511 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 512 struct xdr_stream *xdr, 513 struct cb_recallslotargs *args) 514 { 515 __be32 *p; 516 517 p = read_buf(xdr, 4); 518 if (unlikely(p == NULL)) 519 return htonl(NFS4ERR_BADXDR); 520 args->crsa_target_highest_slotid = ntohl(*p++); 521 return 0; 522 } 523 524 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) 525 { 526 __be32 *p; 527 unsigned int len; 528 529 p = read_buf(xdr, 12); 530 if (unlikely(p == NULL)) 531 return htonl(NFS4ERR_BADXDR); 532 533 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); 534 len = be32_to_cpu(*p); 535 536 p = read_buf(xdr, len); 537 if (unlikely(p == NULL)) 538 return htonl(NFS4ERR_BADXDR); 539 540 /* Only try to decode if the length is right */ 541 if (len == 20) { 542 p += 2; /* skip "lock id:" */ 543 args->cbnl_owner.s_dev = be32_to_cpu(*p++); 544 xdr_decode_hyper(p, &args->cbnl_owner.id); 545 args->cbnl_valid = true; 546 } else { 547 args->cbnl_owner.s_dev = 0; 548 args->cbnl_owner.id = 0; 549 args->cbnl_valid = false; 550 } 551 return 0; 552 } 553 554 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_notify_lock_args *args) 555 { 556 __be32 status; 557 558 status = decode_fh(xdr, &args->cbnl_fh); 559 if (unlikely(status != 0)) 560 goto out; 561 status = decode_lockowner(xdr, args); 562 out: 563 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 564 return status; 565 } 566 567 #endif /* CONFIG_NFS_V4_1 */ 568 569 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 570 { 571 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) 572 return cpu_to_be32(NFS4ERR_RESOURCE); 573 return 0; 574 } 575 576 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 577 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 578 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 579 { 580 __be32 bm[2]; 581 __be32 *p; 582 583 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 584 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 585 if (bm[1] != 0) { 586 p = xdr_reserve_space(xdr, 16); 587 if (unlikely(p == NULL)) 588 return htonl(NFS4ERR_RESOURCE); 589 *p++ = htonl(2); 590 *p++ = bm[0]; 591 *p++ = bm[1]; 592 } else if (bm[0] != 0) { 593 p = xdr_reserve_space(xdr, 12); 594 if (unlikely(p == NULL)) 595 return htonl(NFS4ERR_RESOURCE); 596 *p++ = htonl(1); 597 *p++ = bm[0]; 598 } else { 599 p = xdr_reserve_space(xdr, 8); 600 if (unlikely(p == NULL)) 601 return htonl(NFS4ERR_RESOURCE); 602 *p++ = htonl(0); 603 } 604 *savep = p; 605 return 0; 606 } 607 608 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 609 { 610 __be32 *p; 611 612 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 613 return 0; 614 p = xdr_reserve_space(xdr, 8); 615 if (unlikely(!p)) 616 return htonl(NFS4ERR_RESOURCE); 617 p = xdr_encode_hyper(p, change); 618 return 0; 619 } 620 621 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 622 { 623 __be32 *p; 624 625 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 626 return 0; 627 p = xdr_reserve_space(xdr, 8); 628 if (unlikely(!p)) 629 return htonl(NFS4ERR_RESOURCE); 630 p = xdr_encode_hyper(p, size); 631 return 0; 632 } 633 634 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 635 { 636 __be32 *p; 637 638 p = xdr_reserve_space(xdr, 12); 639 if (unlikely(!p)) 640 return htonl(NFS4ERR_RESOURCE); 641 p = xdr_encode_hyper(p, time->tv_sec); 642 *p = htonl(time->tv_nsec); 643 return 0; 644 } 645 646 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 647 { 648 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 649 return 0; 650 return encode_attr_time(xdr,time); 651 } 652 653 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 654 { 655 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 656 return 0; 657 return encode_attr_time(xdr,time); 658 } 659 660 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 661 { 662 __be32 status; 663 664 hdr->status = xdr_reserve_space(xdr, 4); 665 if (unlikely(hdr->status == NULL)) 666 return htonl(NFS4ERR_RESOURCE); 667 status = encode_string(xdr, hdr->taglen, hdr->tag); 668 if (unlikely(status != 0)) 669 return status; 670 hdr->nops = xdr_reserve_space(xdr, 4); 671 if (unlikely(hdr->nops == NULL)) 672 return htonl(NFS4ERR_RESOURCE); 673 return 0; 674 } 675 676 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 677 { 678 __be32 *p; 679 680 p = xdr_reserve_space(xdr, 8); 681 if (unlikely(p == NULL)) 682 return htonl(NFS4ERR_RESOURCE_HDR); 683 *p++ = htonl(op); 684 *p = res; 685 return 0; 686 } 687 688 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 689 { 690 __be32 *savep = NULL; 691 __be32 status = res->status; 692 693 if (unlikely(status != 0)) 694 goto out; 695 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 696 if (unlikely(status != 0)) 697 goto out; 698 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 699 if (unlikely(status != 0)) 700 goto out; 701 status = encode_attr_size(xdr, res->bitmap, res->size); 702 if (unlikely(status != 0)) 703 goto out; 704 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 705 if (unlikely(status != 0)) 706 goto out; 707 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 708 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 709 out: 710 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 711 return status; 712 } 713 714 #if defined(CONFIG_NFS_V4_1) 715 716 static __be32 encode_sessionid(struct xdr_stream *xdr, 717 const struct nfs4_sessionid *sid) 718 { 719 __be32 *p; 720 721 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 722 if (unlikely(p == NULL)) 723 return htonl(NFS4ERR_RESOURCE); 724 725 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 726 return 0; 727 } 728 729 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 730 struct xdr_stream *xdr, 731 const struct cb_sequenceres *res) 732 { 733 __be32 *p; 734 __be32 status = res->csr_status; 735 736 if (unlikely(status != 0)) 737 goto out; 738 739 status = encode_sessionid(xdr, &res->csr_sessionid); 740 if (status) 741 goto out; 742 743 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 744 if (unlikely(p == NULL)) 745 return htonl(NFS4ERR_RESOURCE); 746 747 *p++ = htonl(res->csr_sequenceid); 748 *p++ = htonl(res->csr_slotid); 749 *p++ = htonl(res->csr_highestslotid); 750 *p++ = htonl(res->csr_target_highestslotid); 751 out: 752 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 753 return status; 754 } 755 756 static __be32 757 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 758 { 759 if (op_nr == OP_CB_SEQUENCE) { 760 if (nop != 0) 761 return htonl(NFS4ERR_SEQUENCE_POS); 762 } else { 763 if (nop == 0) 764 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 765 } 766 767 switch (op_nr) { 768 case OP_CB_GETATTR: 769 case OP_CB_RECALL: 770 case OP_CB_SEQUENCE: 771 case OP_CB_RECALL_ANY: 772 case OP_CB_RECALL_SLOT: 773 case OP_CB_LAYOUTRECALL: 774 case OP_CB_NOTIFY_DEVICEID: 775 case OP_CB_NOTIFY_LOCK: 776 *op = &callback_ops[op_nr]; 777 break; 778 779 case OP_CB_NOTIFY: 780 case OP_CB_PUSH_DELEG: 781 case OP_CB_RECALLABLE_OBJ_AVAIL: 782 case OP_CB_WANTS_CANCELLED: 783 return htonl(NFS4ERR_NOTSUPP); 784 785 default: 786 return htonl(NFS4ERR_OP_ILLEGAL); 787 } 788 789 return htonl(NFS_OK); 790 } 791 792 static void nfs4_callback_free_slot(struct nfs4_session *session, 793 struct nfs4_slot *slot) 794 { 795 struct nfs4_slot_table *tbl = &session->bc_slot_table; 796 797 spin_lock(&tbl->slot_tbl_lock); 798 /* 799 * Let the state manager know callback processing done. 800 * A single slot, so highest used slotid is either 0 or -1 801 */ 802 nfs4_free_slot(tbl, slot); 803 nfs4_slot_tbl_drain_complete(tbl); 804 spin_unlock(&tbl->slot_tbl_lock); 805 } 806 807 static void nfs4_cb_free_slot(struct cb_process_state *cps) 808 { 809 if (cps->slot) { 810 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); 811 cps->slot = NULL; 812 } 813 } 814 815 #else /* CONFIG_NFS_V4_1 */ 816 817 static __be32 818 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 819 { 820 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 821 } 822 823 static void nfs4_cb_free_slot(struct cb_process_state *cps) 824 { 825 } 826 #endif /* CONFIG_NFS_V4_1 */ 827 828 #ifdef CONFIG_NFS_V4_2 829 static __be32 830 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 831 { 832 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 833 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 834 return status; 835 836 if (op_nr == OP_CB_OFFLOAD) 837 return htonl(NFS4ERR_NOTSUPP); 838 return htonl(NFS4ERR_OP_ILLEGAL); 839 } 840 #else /* CONFIG_NFS_V4_2 */ 841 static __be32 842 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 843 { 844 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 845 } 846 #endif /* CONFIG_NFS_V4_2 */ 847 848 static __be32 849 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 850 { 851 switch (op_nr) { 852 case OP_CB_GETATTR: 853 case OP_CB_RECALL: 854 *op = &callback_ops[op_nr]; 855 break; 856 default: 857 return htonl(NFS4ERR_OP_ILLEGAL); 858 } 859 860 return htonl(NFS_OK); 861 } 862 863 static __be32 process_op(int nop, struct svc_rqst *rqstp, 864 struct xdr_stream *xdr_in, void *argp, 865 struct xdr_stream *xdr_out, void *resp, 866 struct cb_process_state *cps) 867 { 868 struct callback_op *op = &callback_ops[0]; 869 unsigned int op_nr; 870 __be32 status; 871 long maxlen; 872 __be32 res; 873 874 dprintk("%s: start\n", __func__); 875 status = decode_op_hdr(xdr_in, &op_nr); 876 if (unlikely(status)) 877 return status; 878 879 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 880 __func__, cps->minorversion, nop, op_nr); 881 882 switch (cps->minorversion) { 883 case 0: 884 status = preprocess_nfs4_op(op_nr, &op); 885 break; 886 case 1: 887 status = preprocess_nfs41_op(nop, op_nr, &op); 888 break; 889 case 2: 890 status = preprocess_nfs42_op(nop, op_nr, &op); 891 break; 892 default: 893 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 894 } 895 896 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 897 op_nr = OP_CB_ILLEGAL; 898 if (status) 899 goto encode_hdr; 900 901 if (cps->drc_status) { 902 status = cps->drc_status; 903 goto encode_hdr; 904 } 905 906 maxlen = xdr_out->end - xdr_out->p; 907 if (maxlen > 0 && maxlen < PAGE_SIZE) { 908 status = op->decode_args(rqstp, xdr_in, argp); 909 if (likely(status == 0)) 910 status = op->process_op(argp, resp, cps); 911 } else 912 status = htonl(NFS4ERR_RESOURCE); 913 914 encode_hdr: 915 res = encode_op_hdr(xdr_out, op_nr, status); 916 if (unlikely(res)) 917 return res; 918 if (op->encode_res != NULL && status == 0) 919 status = op->encode_res(rqstp, xdr_out, resp); 920 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 921 return status; 922 } 923 924 /* 925 * Decode, process and encode a COMPOUND 926 */ 927 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 928 { 929 struct cb_compound_hdr_arg hdr_arg = { 0 }; 930 struct cb_compound_hdr_res hdr_res = { NULL }; 931 struct xdr_stream xdr_in, xdr_out; 932 __be32 *p, status; 933 struct cb_process_state cps = { 934 .drc_status = 0, 935 .clp = NULL, 936 .net = SVC_NET(rqstp), 937 }; 938 unsigned int nops = 0; 939 940 dprintk("%s: start\n", __func__); 941 942 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 943 944 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 945 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 946 947 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 948 if (status == htonl(NFS4ERR_RESOURCE)) 949 return rpc_garbage_args; 950 951 if (hdr_arg.minorversion == 0) { 952 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 953 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 954 goto out_invalidcred; 955 } 956 957 cps.minorversion = hdr_arg.minorversion; 958 hdr_res.taglen = hdr_arg.taglen; 959 hdr_res.tag = hdr_arg.tag; 960 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 961 return rpc_system_err; 962 963 while (status == 0 && nops != hdr_arg.nops) { 964 status = process_op(nops, rqstp, &xdr_in, 965 argp, &xdr_out, resp, &cps); 966 nops++; 967 } 968 969 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 970 * resource error in cb_compound status without returning op */ 971 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 972 status = htonl(NFS4ERR_RESOURCE); 973 nops--; 974 } 975 976 *hdr_res.status = status; 977 *hdr_res.nops = htonl(nops); 978 nfs4_cb_free_slot(&cps); 979 nfs_put_client(cps.clp); 980 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 981 return rpc_success; 982 983 out_invalidcred: 984 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); 985 return rpc_autherr_badcred; 986 } 987 988 /* 989 * Define NFS4 callback COMPOUND ops. 990 */ 991 static struct callback_op callback_ops[] = { 992 [0] = { 993 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 994 }, 995 [OP_CB_GETATTR] = { 996 .process_op = (callback_process_op_t)nfs4_callback_getattr, 997 .decode_args = (callback_decode_arg_t)decode_getattr_args, 998 .encode_res = (callback_encode_res_t)encode_getattr_res, 999 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 1000 }, 1001 [OP_CB_RECALL] = { 1002 .process_op = (callback_process_op_t)nfs4_callback_recall, 1003 .decode_args = (callback_decode_arg_t)decode_recall_args, 1004 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 1005 }, 1006 #if defined(CONFIG_NFS_V4_1) 1007 [OP_CB_LAYOUTRECALL] = { 1008 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall, 1009 .decode_args = 1010 (callback_decode_arg_t)decode_layoutrecall_args, 1011 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 1012 }, 1013 [OP_CB_NOTIFY_DEVICEID] = { 1014 .process_op = (callback_process_op_t)nfs4_callback_devicenotify, 1015 .decode_args = 1016 (callback_decode_arg_t)decode_devicenotify_args, 1017 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 1018 }, 1019 [OP_CB_SEQUENCE] = { 1020 .process_op = (callback_process_op_t)nfs4_callback_sequence, 1021 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 1022 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 1023 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 1024 }, 1025 [OP_CB_RECALL_ANY] = { 1026 .process_op = (callback_process_op_t)nfs4_callback_recallany, 1027 .decode_args = (callback_decode_arg_t)decode_recallany_args, 1028 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 1029 }, 1030 [OP_CB_RECALL_SLOT] = { 1031 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 1032 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 1033 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 1034 }, 1035 [OP_CB_NOTIFY_LOCK] = { 1036 .process_op = (callback_process_op_t)nfs4_callback_notify_lock, 1037 .decode_args = (callback_decode_arg_t)decode_notify_lock_args, 1038 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, 1039 }, 1040 #endif /* CONFIG_NFS_V4_1 */ 1041 }; 1042 1043 /* 1044 * Define NFS4 callback procedures 1045 */ 1046 static struct svc_procedure nfs4_callback_procedures1[] = { 1047 [CB_NULL] = { 1048 .pc_func = nfs4_callback_null, 1049 .pc_decode = (kxdrproc_t)nfs4_decode_void, 1050 .pc_encode = (kxdrproc_t)nfs4_encode_void, 1051 .pc_xdrressize = 1, 1052 }, 1053 [CB_COMPOUND] = { 1054 .pc_func = nfs4_callback_compound, 1055 .pc_encode = (kxdrproc_t)nfs4_encode_void, 1056 .pc_argsize = 256, 1057 .pc_ressize = 256, 1058 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1059 } 1060 }; 1061 1062 struct svc_version nfs4_callback_version1 = { 1063 .vs_vers = 1, 1064 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1065 .vs_proc = nfs4_callback_procedures1, 1066 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1067 .vs_dispatch = NULL, 1068 .vs_hidden = true, 1069 .vs_need_cong_ctrl = true, 1070 }; 1071 1072 struct svc_version nfs4_callback_version4 = { 1073 .vs_vers = 4, 1074 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1075 .vs_proc = nfs4_callback_procedures1, 1076 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1077 .vs_dispatch = NULL, 1078 .vs_hidden = true, 1079 .vs_need_cong_ctrl = true, 1080 }; 1081