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/slab.h> 13 #include <linux/sunrpc/bc_xprt.h> 14 #include "nfs4_fs.h" 15 #include "callback.h" 16 #include "internal.h" 17 18 #define CB_OP_TAGLEN_MAXSZ (512) 19 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ) 20 #define CB_OP_GETATTR_BITMAP_MAXSZ (4) 21 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 22 CB_OP_GETATTR_BITMAP_MAXSZ + \ 23 2 + 2 + 3 + 3) 24 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 25 26 #if defined(CONFIG_NFS_V4_1) 27 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 28 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 29 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 30 4 + 1 + 3) 31 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 32 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 33 #endif /* CONFIG_NFS_V4_1 */ 34 35 #define NFSDBG_FACILITY NFSDBG_CALLBACK 36 37 /* Internal error code */ 38 #define NFS4ERR_RESOURCE_HDR 11050 39 40 typedef __be32 (*callback_process_op_t)(void *, void *, 41 struct cb_process_state *); 42 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 43 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 44 45 46 struct callback_op { 47 callback_process_op_t process_op; 48 callback_decode_arg_t decode_args; 49 callback_encode_res_t encode_res; 50 long res_maxsize; 51 }; 52 53 static struct callback_op callback_ops[]; 54 55 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 56 { 57 return htonl(NFS4_OK); 58 } 59 60 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 61 { 62 return xdr_argsize_check(rqstp, p); 63 } 64 65 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 66 { 67 return xdr_ressize_check(rqstp, p); 68 } 69 70 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) 71 { 72 __be32 *p; 73 74 p = xdr_inline_decode(xdr, nbytes); 75 if (unlikely(p == NULL)) 76 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n"); 77 return p; 78 } 79 80 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 81 { 82 __be32 *p; 83 84 p = read_buf(xdr, 4); 85 if (unlikely(p == NULL)) 86 return htonl(NFS4ERR_RESOURCE); 87 *len = ntohl(*p); 88 89 if (*len != 0) { 90 p = read_buf(xdr, *len); 91 if (unlikely(p == NULL)) 92 return htonl(NFS4ERR_RESOURCE); 93 *str = (const char *)p; 94 } else 95 *str = NULL; 96 97 return 0; 98 } 99 100 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 101 { 102 __be32 *p; 103 104 p = read_buf(xdr, 4); 105 if (unlikely(p == NULL)) 106 return htonl(NFS4ERR_RESOURCE); 107 fh->size = ntohl(*p); 108 if (fh->size > NFS4_FHSIZE) 109 return htonl(NFS4ERR_BADHANDLE); 110 p = read_buf(xdr, fh->size); 111 if (unlikely(p == NULL)) 112 return htonl(NFS4ERR_RESOURCE); 113 memcpy(&fh->data[0], p, fh->size); 114 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 115 return 0; 116 } 117 118 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 119 { 120 __be32 *p; 121 unsigned int attrlen; 122 123 p = read_buf(xdr, 4); 124 if (unlikely(p == NULL)) 125 return htonl(NFS4ERR_RESOURCE); 126 attrlen = ntohl(*p); 127 p = read_buf(xdr, attrlen << 2); 128 if (unlikely(p == NULL)) 129 return htonl(NFS4ERR_RESOURCE); 130 if (likely(attrlen > 0)) 131 bitmap[0] = ntohl(*p++); 132 if (attrlen > 1) 133 bitmap[1] = ntohl(*p); 134 return 0; 135 } 136 137 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 138 { 139 __be32 *p; 140 141 p = read_buf(xdr, 16); 142 if (unlikely(p == NULL)) 143 return htonl(NFS4ERR_RESOURCE); 144 memcpy(stateid->data, p, 16); 145 return 0; 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); 154 if (unlikely(status != 0)) 155 return status; 156 /* We do not like overly long tags! */ 157 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { 158 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n", 159 __func__, hdr->taglen); 160 return htonl(NFS4ERR_RESOURCE); 161 } 162 p = read_buf(xdr, 12); 163 if (unlikely(p == NULL)) 164 return htonl(NFS4ERR_RESOURCE); 165 hdr->minorversion = ntohl(*p++); 166 /* Check minor version is zero or one. */ 167 if (hdr->minorversion <= 1) { 168 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */ 169 } else { 170 printk(KERN_WARNING "%s: NFSv4 server callback with " 171 "illegal minor version %u!\n", 172 __func__, hdr->minorversion); 173 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 174 } 175 hdr->nops = ntohl(*p); 176 dprintk("%s: minorversion %d nops %d\n", __func__, 177 hdr->minorversion, hdr->nops); 178 return 0; 179 } 180 181 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 182 { 183 __be32 *p; 184 p = read_buf(xdr, 4); 185 if (unlikely(p == NULL)) 186 return htonl(NFS4ERR_RESOURCE_HDR); 187 *op = ntohl(*p); 188 return 0; 189 } 190 191 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 192 { 193 __be32 status; 194 195 status = decode_fh(xdr, &args->fh); 196 if (unlikely(status != 0)) 197 goto out; 198 args->addr = svc_addr(rqstp); 199 status = decode_bitmap(xdr, args->bitmap); 200 out: 201 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 202 return status; 203 } 204 205 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 206 { 207 __be32 *p; 208 __be32 status; 209 210 args->addr = svc_addr(rqstp); 211 status = decode_stateid(xdr, &args->stateid); 212 if (unlikely(status != 0)) 213 goto out; 214 p = read_buf(xdr, 4); 215 if (unlikely(p == NULL)) { 216 status = htonl(NFS4ERR_RESOURCE); 217 goto out; 218 } 219 args->truncate = ntohl(*p); 220 status = decode_fh(xdr, &args->fh); 221 out: 222 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 223 return status; 224 } 225 226 #if defined(CONFIG_NFS_V4_1) 227 228 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 229 struct xdr_stream *xdr, 230 struct cb_layoutrecallargs *args) 231 { 232 __be32 *p; 233 __be32 status = 0; 234 uint32_t iomode; 235 236 args->cbl_addr = svc_addr(rqstp); 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_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(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 int len = NFS4_MAX_SESSIONID_LEN; 384 385 p = read_buf(xdr, len); 386 if (unlikely(p == NULL)) 387 return htonl(NFS4ERR_RESOURCE); 388 389 memcpy(sid->data, p, len); 390 return 0; 391 } 392 393 static __be32 decode_rc_list(struct xdr_stream *xdr, 394 struct referring_call_list *rc_list) 395 { 396 __be32 *p; 397 int i; 398 __be32 status; 399 400 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 401 if (status) 402 goto out; 403 404 status = htonl(NFS4ERR_RESOURCE); 405 p = read_buf(xdr, sizeof(uint32_t)); 406 if (unlikely(p == NULL)) 407 goto out; 408 409 rc_list->rcl_nrefcalls = ntohl(*p++); 410 if (rc_list->rcl_nrefcalls) { 411 p = read_buf(xdr, 412 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 413 if (unlikely(p == NULL)) 414 goto out; 415 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * 416 sizeof(*rc_list->rcl_refcalls), 417 GFP_KERNEL); 418 if (unlikely(rc_list->rcl_refcalls == NULL)) 419 goto out; 420 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 421 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 422 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 423 } 424 } 425 status = 0; 426 427 out: 428 return status; 429 } 430 431 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 432 struct xdr_stream *xdr, 433 struct cb_sequenceargs *args) 434 { 435 __be32 *p; 436 int i; 437 __be32 status; 438 439 status = decode_sessionid(xdr, &args->csa_sessionid); 440 if (status) 441 goto out; 442 443 status = htonl(NFS4ERR_RESOURCE); 444 p = read_buf(xdr, 5 * sizeof(uint32_t)); 445 if (unlikely(p == NULL)) 446 goto out; 447 448 args->csa_addr = svc_addr(rqstp); 449 args->csa_sequenceid = ntohl(*p++); 450 args->csa_slotid = ntohl(*p++); 451 args->csa_highestslotid = ntohl(*p++); 452 args->csa_cachethis = ntohl(*p++); 453 args->csa_nrclists = ntohl(*p++); 454 args->csa_rclists = NULL; 455 if (args->csa_nrclists) { 456 args->csa_rclists = kmalloc(args->csa_nrclists * 457 sizeof(*args->csa_rclists), 458 GFP_KERNEL); 459 if (unlikely(args->csa_rclists == NULL)) 460 goto out; 461 462 for (i = 0; i < args->csa_nrclists; i++) { 463 status = decode_rc_list(xdr, &args->csa_rclists[i]); 464 if (status) 465 goto out_free; 466 } 467 } 468 status = 0; 469 470 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 471 "highestslotid %u cachethis %d nrclists %u\n", 472 __func__, 473 ((u32 *)&args->csa_sessionid)[0], 474 ((u32 *)&args->csa_sessionid)[1], 475 ((u32 *)&args->csa_sessionid)[2], 476 ((u32 *)&args->csa_sessionid)[3], 477 args->csa_sequenceid, args->csa_slotid, 478 args->csa_highestslotid, args->csa_cachethis, 479 args->csa_nrclists); 480 out: 481 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 482 return status; 483 484 out_free: 485 for (i = 0; i < args->csa_nrclists; i++) 486 kfree(args->csa_rclists[i].rcl_refcalls); 487 kfree(args->csa_rclists); 488 goto out; 489 } 490 491 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 492 struct xdr_stream *xdr, 493 struct cb_recallanyargs *args) 494 { 495 uint32_t bitmap[2]; 496 __be32 *p, status; 497 498 args->craa_addr = svc_addr(rqstp); 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 args->crsa_addr = svc_addr(rqstp); 518 p = read_buf(xdr, 4); 519 if (unlikely(p == NULL)) 520 return htonl(NFS4ERR_BADXDR); 521 args->crsa_target_max_slots = ntohl(*p++); 522 return 0; 523 } 524 525 #endif /* CONFIG_NFS_V4_1 */ 526 527 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 528 { 529 __be32 *p; 530 531 p = xdr_reserve_space(xdr, 4 + len); 532 if (unlikely(p == NULL)) 533 return htonl(NFS4ERR_RESOURCE); 534 xdr_encode_opaque(p, str, len); 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, const struct cb_getattrres *res) 651 { 652 __be32 *savep = NULL; 653 __be32 status = res->status; 654 655 if (unlikely(status != 0)) 656 goto out; 657 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 658 if (unlikely(status != 0)) 659 goto out; 660 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 661 if (unlikely(status != 0)) 662 goto out; 663 status = encode_attr_size(xdr, res->bitmap, res->size); 664 if (unlikely(status != 0)) 665 goto out; 666 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 667 if (unlikely(status != 0)) 668 goto out; 669 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 670 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 671 out: 672 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 673 return status; 674 } 675 676 #if defined(CONFIG_NFS_V4_1) 677 678 static __be32 encode_sessionid(struct xdr_stream *xdr, 679 const struct nfs4_sessionid *sid) 680 { 681 __be32 *p; 682 int len = NFS4_MAX_SESSIONID_LEN; 683 684 p = xdr_reserve_space(xdr, len); 685 if (unlikely(p == NULL)) 686 return htonl(NFS4ERR_RESOURCE); 687 688 memcpy(p, sid, len); 689 return 0; 690 } 691 692 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 693 struct xdr_stream *xdr, 694 const struct cb_sequenceres *res) 695 { 696 __be32 *p; 697 unsigned status = res->csr_status; 698 699 if (unlikely(status != 0)) 700 goto out; 701 702 encode_sessionid(xdr, &res->csr_sessionid); 703 704 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 705 if (unlikely(p == NULL)) 706 return htonl(NFS4ERR_RESOURCE); 707 708 *p++ = htonl(res->csr_sequenceid); 709 *p++ = htonl(res->csr_slotid); 710 *p++ = htonl(res->csr_highestslotid); 711 *p++ = htonl(res->csr_target_highestslotid); 712 out: 713 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 714 return status; 715 } 716 717 static __be32 718 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 719 { 720 if (op_nr == OP_CB_SEQUENCE) { 721 if (nop != 0) 722 return htonl(NFS4ERR_SEQUENCE_POS); 723 } else { 724 if (nop == 0) 725 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 726 } 727 728 switch (op_nr) { 729 case OP_CB_GETATTR: 730 case OP_CB_RECALL: 731 case OP_CB_SEQUENCE: 732 case OP_CB_RECALL_ANY: 733 case OP_CB_RECALL_SLOT: 734 case OP_CB_LAYOUTRECALL: 735 case OP_CB_NOTIFY_DEVICEID: 736 *op = &callback_ops[op_nr]; 737 break; 738 739 case OP_CB_NOTIFY: 740 case OP_CB_PUSH_DELEG: 741 case OP_CB_RECALLABLE_OBJ_AVAIL: 742 case OP_CB_WANTS_CANCELLED: 743 case OP_CB_NOTIFY_LOCK: 744 return htonl(NFS4ERR_NOTSUPP); 745 746 default: 747 return htonl(NFS4ERR_OP_ILLEGAL); 748 } 749 750 return htonl(NFS_OK); 751 } 752 753 static void nfs4_callback_free_slot(struct nfs4_session *session) 754 { 755 struct nfs4_slot_table *tbl = &session->bc_slot_table; 756 757 spin_lock(&tbl->slot_tbl_lock); 758 /* 759 * Let the state manager know callback processing done. 760 * A single slot, so highest used slotid is either 0 or -1 761 */ 762 tbl->highest_used_slotid = -1; 763 nfs4_check_drain_bc_complete(session); 764 spin_unlock(&tbl->slot_tbl_lock); 765 } 766 767 static void nfs4_cb_free_slot(struct cb_process_state *cps) 768 { 769 if (cps->slotid != -1) 770 nfs4_callback_free_slot(cps->clp->cl_session); 771 } 772 773 #else /* CONFIG_NFS_V4_1 */ 774 775 static __be32 776 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 777 { 778 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 779 } 780 781 static void nfs4_cb_free_slot(struct cb_process_state *cps) 782 { 783 } 784 #endif /* CONFIG_NFS_V4_1 */ 785 786 static __be32 787 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 788 { 789 switch (op_nr) { 790 case OP_CB_GETATTR: 791 case OP_CB_RECALL: 792 *op = &callback_ops[op_nr]; 793 break; 794 default: 795 return htonl(NFS4ERR_OP_ILLEGAL); 796 } 797 798 return htonl(NFS_OK); 799 } 800 801 static __be32 process_op(uint32_t minorversion, int nop, 802 struct svc_rqst *rqstp, 803 struct xdr_stream *xdr_in, void *argp, 804 struct xdr_stream *xdr_out, void *resp, 805 struct cb_process_state *cps) 806 { 807 struct callback_op *op = &callback_ops[0]; 808 unsigned int op_nr; 809 __be32 status; 810 long maxlen; 811 __be32 res; 812 813 dprintk("%s: start\n", __func__); 814 status = decode_op_hdr(xdr_in, &op_nr); 815 if (unlikely(status)) 816 return status; 817 818 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 819 __func__, minorversion, nop, op_nr); 820 821 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : 822 preprocess_nfs4_op(op_nr, &op); 823 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 824 op_nr = OP_CB_ILLEGAL; 825 if (status) 826 goto encode_hdr; 827 828 if (cps->drc_status) { 829 status = cps->drc_status; 830 goto encode_hdr; 831 } 832 833 maxlen = xdr_out->end - xdr_out->p; 834 if (maxlen > 0 && maxlen < PAGE_SIZE) { 835 status = op->decode_args(rqstp, xdr_in, argp); 836 if (likely(status == 0)) 837 status = op->process_op(argp, resp, cps); 838 } else 839 status = htonl(NFS4ERR_RESOURCE); 840 841 encode_hdr: 842 res = encode_op_hdr(xdr_out, op_nr, status); 843 if (unlikely(res)) 844 return res; 845 if (op->encode_res != NULL && status == 0) 846 status = op->encode_res(rqstp, xdr_out, resp); 847 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 848 return status; 849 } 850 851 /* 852 * Decode, process and encode a COMPOUND 853 */ 854 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 855 { 856 struct cb_compound_hdr_arg hdr_arg = { 0 }; 857 struct cb_compound_hdr_res hdr_res = { NULL }; 858 struct xdr_stream xdr_in, xdr_out; 859 __be32 *p, status; 860 struct cb_process_state cps = { 861 .drc_status = 0, 862 .clp = NULL, 863 .slotid = -1, 864 }; 865 unsigned int nops = 0; 866 867 dprintk("%s: start\n", __func__); 868 869 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 870 871 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 872 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 873 874 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 875 if (status == __constant_htonl(NFS4ERR_RESOURCE)) 876 return rpc_garbage_args; 877 878 if (hdr_arg.minorversion == 0) { 879 cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident); 880 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 881 return rpc_drop_reply; 882 } 883 884 hdr_res.taglen = hdr_arg.taglen; 885 hdr_res.tag = hdr_arg.tag; 886 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 887 return rpc_system_err; 888 889 while (status == 0 && nops != hdr_arg.nops) { 890 status = process_op(hdr_arg.minorversion, nops, rqstp, 891 &xdr_in, argp, &xdr_out, resp, &cps); 892 nops++; 893 } 894 895 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 896 * resource error in cb_compound status without returning op */ 897 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 898 status = htonl(NFS4ERR_RESOURCE); 899 nops--; 900 } 901 902 *hdr_res.status = status; 903 *hdr_res.nops = htonl(nops); 904 nfs4_cb_free_slot(&cps); 905 nfs_put_client(cps.clp); 906 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 907 return rpc_success; 908 } 909 910 /* 911 * Define NFS4 callback COMPOUND ops. 912 */ 913 static struct callback_op callback_ops[] = { 914 [0] = { 915 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 916 }, 917 [OP_CB_GETATTR] = { 918 .process_op = (callback_process_op_t)nfs4_callback_getattr, 919 .decode_args = (callback_decode_arg_t)decode_getattr_args, 920 .encode_res = (callback_encode_res_t)encode_getattr_res, 921 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 922 }, 923 [OP_CB_RECALL] = { 924 .process_op = (callback_process_op_t)nfs4_callback_recall, 925 .decode_args = (callback_decode_arg_t)decode_recall_args, 926 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 927 }, 928 #if defined(CONFIG_NFS_V4_1) 929 [OP_CB_LAYOUTRECALL] = { 930 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall, 931 .decode_args = 932 (callback_decode_arg_t)decode_layoutrecall_args, 933 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 934 }, 935 [OP_CB_NOTIFY_DEVICEID] = { 936 .process_op = (callback_process_op_t)nfs4_callback_devicenotify, 937 .decode_args = 938 (callback_decode_arg_t)decode_devicenotify_args, 939 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 940 }, 941 [OP_CB_SEQUENCE] = { 942 .process_op = (callback_process_op_t)nfs4_callback_sequence, 943 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 944 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 945 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 946 }, 947 [OP_CB_RECALL_ANY] = { 948 .process_op = (callback_process_op_t)nfs4_callback_recallany, 949 .decode_args = (callback_decode_arg_t)decode_recallany_args, 950 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 951 }, 952 [OP_CB_RECALL_SLOT] = { 953 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 954 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 955 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 956 }, 957 #endif /* CONFIG_NFS_V4_1 */ 958 }; 959 960 /* 961 * Define NFS4 callback procedures 962 */ 963 static struct svc_procedure nfs4_callback_procedures1[] = { 964 [CB_NULL] = { 965 .pc_func = nfs4_callback_null, 966 .pc_decode = (kxdrproc_t)nfs4_decode_void, 967 .pc_encode = (kxdrproc_t)nfs4_encode_void, 968 .pc_xdrressize = 1, 969 }, 970 [CB_COMPOUND] = { 971 .pc_func = nfs4_callback_compound, 972 .pc_encode = (kxdrproc_t)nfs4_encode_void, 973 .pc_argsize = 256, 974 .pc_ressize = 256, 975 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 976 } 977 }; 978 979 struct svc_version nfs4_callback_version1 = { 980 .vs_vers = 1, 981 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 982 .vs_proc = nfs4_callback_procedures1, 983 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 984 .vs_dispatch = NULL, 985 .vs_hidden = 1, 986 }; 987 988 struct svc_version nfs4_callback_version4 = { 989 .vs_vers = 4, 990 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 991 .vs_proc = nfs4_callback_procedures1, 992 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 993 .vs_dispatch = NULL, 994 .vs_hidden = 1, 995 }; 996