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; 308 309 args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL); 310 if (!args->devs) { 311 status = htonl(NFS4ERR_DELAY); 312 goto out; 313 } 314 315 /* Decode each dev notification */ 316 for (i = 0; i < n; i++) { 317 struct cb_devicenotifyitem *dev = &args->devs[i]; 318 319 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE); 320 if (unlikely(p == NULL)) { 321 status = htonl(NFS4ERR_BADXDR); 322 goto err; 323 } 324 325 tmp = ntohl(*p++); /* bitmap size */ 326 if (tmp != 1) { 327 status = htonl(NFS4ERR_INVAL); 328 goto err; 329 } 330 dev->cbd_notify_type = ntohl(*p++); 331 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 332 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 333 status = htonl(NFS4ERR_INVAL); 334 goto err; 335 } 336 337 tmp = ntohl(*p++); /* opaque size */ 338 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 339 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 340 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 341 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 342 status = htonl(NFS4ERR_INVAL); 343 goto err; 344 } 345 dev->cbd_layout_type = ntohl(*p++); 346 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 347 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 348 349 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 350 p = read_buf(xdr, sizeof(uint32_t)); 351 if (unlikely(p == NULL)) { 352 status = htonl(NFS4ERR_BADXDR); 353 goto err; 354 } 355 dev->cbd_immediate = ntohl(*p++); 356 } else { 357 dev->cbd_immediate = 0; 358 } 359 360 args->ndevs++; 361 362 dprintk("%s: type %d layout 0x%x immediate %d\n", 363 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 364 dev->cbd_immediate); 365 } 366 out: 367 dprintk("%s: status %d ndevs %d\n", 368 __func__, ntohl(status), args->ndevs); 369 return status; 370 err: 371 kfree(args->devs); 372 goto out; 373 } 374 375 static __be32 decode_sessionid(struct xdr_stream *xdr, 376 struct nfs4_sessionid *sid) 377 { 378 __be32 *p; 379 int len = NFS4_MAX_SESSIONID_LEN; 380 381 p = read_buf(xdr, len); 382 if (unlikely(p == NULL)) 383 return htonl(NFS4ERR_RESOURCE); 384 385 memcpy(sid->data, p, len); 386 return 0; 387 } 388 389 static __be32 decode_rc_list(struct xdr_stream *xdr, 390 struct referring_call_list *rc_list) 391 { 392 __be32 *p; 393 int i; 394 __be32 status; 395 396 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 397 if (status) 398 goto out; 399 400 status = htonl(NFS4ERR_RESOURCE); 401 p = read_buf(xdr, sizeof(uint32_t)); 402 if (unlikely(p == NULL)) 403 goto out; 404 405 rc_list->rcl_nrefcalls = ntohl(*p++); 406 if (rc_list->rcl_nrefcalls) { 407 p = read_buf(xdr, 408 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 409 if (unlikely(p == NULL)) 410 goto out; 411 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * 412 sizeof(*rc_list->rcl_refcalls), 413 GFP_KERNEL); 414 if (unlikely(rc_list->rcl_refcalls == NULL)) 415 goto out; 416 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 417 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 418 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 419 } 420 } 421 status = 0; 422 423 out: 424 return status; 425 } 426 427 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 428 struct xdr_stream *xdr, 429 struct cb_sequenceargs *args) 430 { 431 __be32 *p; 432 int i; 433 __be32 status; 434 435 status = decode_sessionid(xdr, &args->csa_sessionid); 436 if (status) 437 goto out; 438 439 status = htonl(NFS4ERR_RESOURCE); 440 p = read_buf(xdr, 5 * sizeof(uint32_t)); 441 if (unlikely(p == NULL)) 442 goto out; 443 444 args->csa_addr = svc_addr(rqstp); 445 args->csa_sequenceid = ntohl(*p++); 446 args->csa_slotid = ntohl(*p++); 447 args->csa_highestslotid = ntohl(*p++); 448 args->csa_cachethis = ntohl(*p++); 449 args->csa_nrclists = ntohl(*p++); 450 args->csa_rclists = NULL; 451 if (args->csa_nrclists) { 452 args->csa_rclists = kmalloc(args->csa_nrclists * 453 sizeof(*args->csa_rclists), 454 GFP_KERNEL); 455 if (unlikely(args->csa_rclists == NULL)) 456 goto out; 457 458 for (i = 0; i < args->csa_nrclists; i++) { 459 status = decode_rc_list(xdr, &args->csa_rclists[i]); 460 if (status) 461 goto out_free; 462 } 463 } 464 status = 0; 465 466 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 467 "highestslotid %u cachethis %d nrclists %u\n", 468 __func__, 469 ((u32 *)&args->csa_sessionid)[0], 470 ((u32 *)&args->csa_sessionid)[1], 471 ((u32 *)&args->csa_sessionid)[2], 472 ((u32 *)&args->csa_sessionid)[3], 473 args->csa_sequenceid, args->csa_slotid, 474 args->csa_highestslotid, args->csa_cachethis, 475 args->csa_nrclists); 476 out: 477 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 478 return status; 479 480 out_free: 481 for (i = 0; i < args->csa_nrclists; i++) 482 kfree(args->csa_rclists[i].rcl_refcalls); 483 kfree(args->csa_rclists); 484 goto out; 485 } 486 487 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 488 struct xdr_stream *xdr, 489 struct cb_recallanyargs *args) 490 { 491 uint32_t bitmap[2]; 492 __be32 *p, status; 493 494 args->craa_addr = svc_addr(rqstp); 495 p = read_buf(xdr, 4); 496 if (unlikely(p == NULL)) 497 return htonl(NFS4ERR_BADXDR); 498 args->craa_objs_to_keep = ntohl(*p++); 499 status = decode_bitmap(xdr, bitmap); 500 if (unlikely(status)) 501 return status; 502 args->craa_type_mask = bitmap[0]; 503 504 return 0; 505 } 506 507 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 508 struct xdr_stream *xdr, 509 struct cb_recallslotargs *args) 510 { 511 __be32 *p; 512 513 args->crsa_addr = svc_addr(rqstp); 514 p = read_buf(xdr, 4); 515 if (unlikely(p == NULL)) 516 return htonl(NFS4ERR_BADXDR); 517 args->crsa_target_max_slots = ntohl(*p++); 518 return 0; 519 } 520 521 #endif /* CONFIG_NFS_V4_1 */ 522 523 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 524 { 525 __be32 *p; 526 527 p = xdr_reserve_space(xdr, 4 + len); 528 if (unlikely(p == NULL)) 529 return htonl(NFS4ERR_RESOURCE); 530 xdr_encode_opaque(p, str, len); 531 return 0; 532 } 533 534 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 535 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 536 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 537 { 538 __be32 bm[2]; 539 __be32 *p; 540 541 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 542 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 543 if (bm[1] != 0) { 544 p = xdr_reserve_space(xdr, 16); 545 if (unlikely(p == NULL)) 546 return htonl(NFS4ERR_RESOURCE); 547 *p++ = htonl(2); 548 *p++ = bm[0]; 549 *p++ = bm[1]; 550 } else if (bm[0] != 0) { 551 p = xdr_reserve_space(xdr, 12); 552 if (unlikely(p == NULL)) 553 return htonl(NFS4ERR_RESOURCE); 554 *p++ = htonl(1); 555 *p++ = bm[0]; 556 } else { 557 p = xdr_reserve_space(xdr, 8); 558 if (unlikely(p == NULL)) 559 return htonl(NFS4ERR_RESOURCE); 560 *p++ = htonl(0); 561 } 562 *savep = p; 563 return 0; 564 } 565 566 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 567 { 568 __be32 *p; 569 570 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 571 return 0; 572 p = xdr_reserve_space(xdr, 8); 573 if (unlikely(!p)) 574 return htonl(NFS4ERR_RESOURCE); 575 p = xdr_encode_hyper(p, change); 576 return 0; 577 } 578 579 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 580 { 581 __be32 *p; 582 583 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 584 return 0; 585 p = xdr_reserve_space(xdr, 8); 586 if (unlikely(!p)) 587 return htonl(NFS4ERR_RESOURCE); 588 p = xdr_encode_hyper(p, size); 589 return 0; 590 } 591 592 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 593 { 594 __be32 *p; 595 596 p = xdr_reserve_space(xdr, 12); 597 if (unlikely(!p)) 598 return htonl(NFS4ERR_RESOURCE); 599 p = xdr_encode_hyper(p, time->tv_sec); 600 *p = htonl(time->tv_nsec); 601 return 0; 602 } 603 604 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 605 { 606 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 607 return 0; 608 return encode_attr_time(xdr,time); 609 } 610 611 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 612 { 613 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 614 return 0; 615 return encode_attr_time(xdr,time); 616 } 617 618 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 619 { 620 __be32 status; 621 622 hdr->status = xdr_reserve_space(xdr, 4); 623 if (unlikely(hdr->status == NULL)) 624 return htonl(NFS4ERR_RESOURCE); 625 status = encode_string(xdr, hdr->taglen, hdr->tag); 626 if (unlikely(status != 0)) 627 return status; 628 hdr->nops = xdr_reserve_space(xdr, 4); 629 if (unlikely(hdr->nops == NULL)) 630 return htonl(NFS4ERR_RESOURCE); 631 return 0; 632 } 633 634 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 635 { 636 __be32 *p; 637 638 p = xdr_reserve_space(xdr, 8); 639 if (unlikely(p == NULL)) 640 return htonl(NFS4ERR_RESOURCE_HDR); 641 *p++ = htonl(op); 642 *p = res; 643 return 0; 644 } 645 646 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 647 { 648 __be32 *savep = NULL; 649 __be32 status = res->status; 650 651 if (unlikely(status != 0)) 652 goto out; 653 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 654 if (unlikely(status != 0)) 655 goto out; 656 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 657 if (unlikely(status != 0)) 658 goto out; 659 status = encode_attr_size(xdr, res->bitmap, res->size); 660 if (unlikely(status != 0)) 661 goto out; 662 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 663 if (unlikely(status != 0)) 664 goto out; 665 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 666 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 667 out: 668 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 669 return status; 670 } 671 672 #if defined(CONFIG_NFS_V4_1) 673 674 static __be32 encode_sessionid(struct xdr_stream *xdr, 675 const struct nfs4_sessionid *sid) 676 { 677 __be32 *p; 678 int len = NFS4_MAX_SESSIONID_LEN; 679 680 p = xdr_reserve_space(xdr, len); 681 if (unlikely(p == NULL)) 682 return htonl(NFS4ERR_RESOURCE); 683 684 memcpy(p, sid, len); 685 return 0; 686 } 687 688 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 689 struct xdr_stream *xdr, 690 const struct cb_sequenceres *res) 691 { 692 __be32 *p; 693 unsigned status = res->csr_status; 694 695 if (unlikely(status != 0)) 696 goto out; 697 698 encode_sessionid(xdr, &res->csr_sessionid); 699 700 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 701 if (unlikely(p == NULL)) 702 return htonl(NFS4ERR_RESOURCE); 703 704 *p++ = htonl(res->csr_sequenceid); 705 *p++ = htonl(res->csr_slotid); 706 *p++ = htonl(res->csr_highestslotid); 707 *p++ = htonl(res->csr_target_highestslotid); 708 out: 709 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 710 return status; 711 } 712 713 static __be32 714 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 715 { 716 if (op_nr == OP_CB_SEQUENCE) { 717 if (nop != 0) 718 return htonl(NFS4ERR_SEQUENCE_POS); 719 } else { 720 if (nop == 0) 721 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 722 } 723 724 switch (op_nr) { 725 case OP_CB_GETATTR: 726 case OP_CB_RECALL: 727 case OP_CB_SEQUENCE: 728 case OP_CB_RECALL_ANY: 729 case OP_CB_RECALL_SLOT: 730 case OP_CB_LAYOUTRECALL: 731 case OP_CB_NOTIFY_DEVICEID: 732 *op = &callback_ops[op_nr]; 733 break; 734 735 case OP_CB_NOTIFY: 736 case OP_CB_PUSH_DELEG: 737 case OP_CB_RECALLABLE_OBJ_AVAIL: 738 case OP_CB_WANTS_CANCELLED: 739 case OP_CB_NOTIFY_LOCK: 740 return htonl(NFS4ERR_NOTSUPP); 741 742 default: 743 return htonl(NFS4ERR_OP_ILLEGAL); 744 } 745 746 return htonl(NFS_OK); 747 } 748 749 static void nfs4_callback_free_slot(struct nfs4_session *session) 750 { 751 struct nfs4_slot_table *tbl = &session->bc_slot_table; 752 753 spin_lock(&tbl->slot_tbl_lock); 754 /* 755 * Let the state manager know callback processing done. 756 * A single slot, so highest used slotid is either 0 or -1 757 */ 758 tbl->highest_used_slotid = -1; 759 nfs4_check_drain_bc_complete(session); 760 spin_unlock(&tbl->slot_tbl_lock); 761 } 762 763 static void nfs4_cb_free_slot(struct cb_process_state *cps) 764 { 765 if (cps->slotid != -1) 766 nfs4_callback_free_slot(cps->clp->cl_session); 767 } 768 769 #else /* CONFIG_NFS_V4_1 */ 770 771 static __be32 772 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 773 { 774 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 775 } 776 777 static void nfs4_cb_free_slot(struct cb_process_state *cps) 778 { 779 } 780 #endif /* CONFIG_NFS_V4_1 */ 781 782 static __be32 783 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 784 { 785 switch (op_nr) { 786 case OP_CB_GETATTR: 787 case OP_CB_RECALL: 788 *op = &callback_ops[op_nr]; 789 break; 790 default: 791 return htonl(NFS4ERR_OP_ILLEGAL); 792 } 793 794 return htonl(NFS_OK); 795 } 796 797 static __be32 process_op(uint32_t minorversion, int nop, 798 struct svc_rqst *rqstp, 799 struct xdr_stream *xdr_in, void *argp, 800 struct xdr_stream *xdr_out, void *resp, 801 struct cb_process_state *cps) 802 { 803 struct callback_op *op = &callback_ops[0]; 804 unsigned int op_nr; 805 __be32 status; 806 long maxlen; 807 __be32 res; 808 809 dprintk("%s: start\n", __func__); 810 status = decode_op_hdr(xdr_in, &op_nr); 811 if (unlikely(status)) 812 return status; 813 814 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 815 __func__, minorversion, nop, op_nr); 816 817 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : 818 preprocess_nfs4_op(op_nr, &op); 819 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 820 op_nr = OP_CB_ILLEGAL; 821 if (status) 822 goto encode_hdr; 823 824 if (cps->drc_status) { 825 status = cps->drc_status; 826 goto encode_hdr; 827 } 828 829 maxlen = xdr_out->end - xdr_out->p; 830 if (maxlen > 0 && maxlen < PAGE_SIZE) { 831 status = op->decode_args(rqstp, xdr_in, argp); 832 if (likely(status == 0)) 833 status = op->process_op(argp, resp, cps); 834 } else 835 status = htonl(NFS4ERR_RESOURCE); 836 837 encode_hdr: 838 res = encode_op_hdr(xdr_out, op_nr, status); 839 if (unlikely(res)) 840 return res; 841 if (op->encode_res != NULL && status == 0) 842 status = op->encode_res(rqstp, xdr_out, resp); 843 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 844 return status; 845 } 846 847 /* 848 * Decode, process and encode a COMPOUND 849 */ 850 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 851 { 852 struct cb_compound_hdr_arg hdr_arg = { 0 }; 853 struct cb_compound_hdr_res hdr_res = { NULL }; 854 struct xdr_stream xdr_in, xdr_out; 855 __be32 *p, status; 856 struct cb_process_state cps = { 857 .drc_status = 0, 858 .clp = NULL, 859 .slotid = -1, 860 }; 861 unsigned int nops = 0; 862 863 dprintk("%s: start\n", __func__); 864 865 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 866 867 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 868 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 869 870 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 871 if (status == __constant_htonl(NFS4ERR_RESOURCE)) 872 return rpc_garbage_args; 873 874 if (hdr_arg.minorversion == 0) { 875 cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident); 876 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 877 return rpc_drop_reply; 878 } 879 880 hdr_res.taglen = hdr_arg.taglen; 881 hdr_res.tag = hdr_arg.tag; 882 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 883 return rpc_system_err; 884 885 while (status == 0 && nops != hdr_arg.nops) { 886 status = process_op(hdr_arg.minorversion, nops, rqstp, 887 &xdr_in, argp, &xdr_out, resp, &cps); 888 nops++; 889 } 890 891 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 892 * resource error in cb_compound status without returning op */ 893 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 894 status = htonl(NFS4ERR_RESOURCE); 895 nops--; 896 } 897 898 *hdr_res.status = status; 899 *hdr_res.nops = htonl(nops); 900 nfs4_cb_free_slot(&cps); 901 nfs_put_client(cps.clp); 902 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 903 return rpc_success; 904 } 905 906 /* 907 * Define NFS4 callback COMPOUND ops. 908 */ 909 static struct callback_op callback_ops[] = { 910 [0] = { 911 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 912 }, 913 [OP_CB_GETATTR] = { 914 .process_op = (callback_process_op_t)nfs4_callback_getattr, 915 .decode_args = (callback_decode_arg_t)decode_getattr_args, 916 .encode_res = (callback_encode_res_t)encode_getattr_res, 917 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 918 }, 919 [OP_CB_RECALL] = { 920 .process_op = (callback_process_op_t)nfs4_callback_recall, 921 .decode_args = (callback_decode_arg_t)decode_recall_args, 922 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 923 }, 924 #if defined(CONFIG_NFS_V4_1) 925 [OP_CB_LAYOUTRECALL] = { 926 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall, 927 .decode_args = 928 (callback_decode_arg_t)decode_layoutrecall_args, 929 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 930 }, 931 [OP_CB_NOTIFY_DEVICEID] = { 932 .process_op = (callback_process_op_t)nfs4_callback_devicenotify, 933 .decode_args = 934 (callback_decode_arg_t)decode_devicenotify_args, 935 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 936 }, 937 [OP_CB_SEQUENCE] = { 938 .process_op = (callback_process_op_t)nfs4_callback_sequence, 939 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 940 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 941 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 942 }, 943 [OP_CB_RECALL_ANY] = { 944 .process_op = (callback_process_op_t)nfs4_callback_recallany, 945 .decode_args = (callback_decode_arg_t)decode_recallany_args, 946 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 947 }, 948 [OP_CB_RECALL_SLOT] = { 949 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 950 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 951 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 952 }, 953 #endif /* CONFIG_NFS_V4_1 */ 954 }; 955 956 /* 957 * Define NFS4 callback procedures 958 */ 959 static struct svc_procedure nfs4_callback_procedures1[] = { 960 [CB_NULL] = { 961 .pc_func = nfs4_callback_null, 962 .pc_decode = (kxdrproc_t)nfs4_decode_void, 963 .pc_encode = (kxdrproc_t)nfs4_encode_void, 964 .pc_xdrressize = 1, 965 }, 966 [CB_COMPOUND] = { 967 .pc_func = nfs4_callback_compound, 968 .pc_encode = (kxdrproc_t)nfs4_encode_void, 969 .pc_argsize = 256, 970 .pc_ressize = 256, 971 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 972 } 973 }; 974 975 struct svc_version nfs4_callback_version1 = { 976 .vs_vers = 1, 977 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 978 .vs_proc = nfs4_callback_procedures1, 979 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 980 .vs_dispatch = NULL, 981 .vs_hidden = 1, 982 }; 983 984 struct svc_version nfs4_callback_version4 = { 985 .vs_vers = 4, 986 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 987 .vs_proc = nfs4_callback_procedures1, 988 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 989 .vs_dispatch = NULL, 990 .vs_hidden = 1, 991 }; 992