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_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 29 4 + 1 + 3) 30 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 31 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 32 #endif /* CONFIG_NFS_V4_1 */ 33 34 #define NFSDBG_FACILITY NFSDBG_CALLBACK 35 36 /* Internal error code */ 37 #define NFS4ERR_RESOURCE_HDR 11050 38 39 typedef __be32 (*callback_process_op_t)(void *, void *, 40 struct cb_process_state *); 41 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 42 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 43 44 45 struct callback_op { 46 callback_process_op_t process_op; 47 callback_decode_arg_t decode_args; 48 callback_encode_res_t encode_res; 49 long res_maxsize; 50 }; 51 52 static struct callback_op callback_ops[]; 53 54 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 55 { 56 return htonl(NFS4_OK); 57 } 58 59 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 60 { 61 return xdr_argsize_check(rqstp, p); 62 } 63 64 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 65 { 66 return xdr_ressize_check(rqstp, p); 67 } 68 69 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) 70 { 71 __be32 *p; 72 73 p = xdr_inline_decode(xdr, nbytes); 74 if (unlikely(p == NULL)) 75 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n"); 76 return p; 77 } 78 79 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 80 { 81 __be32 *p; 82 83 p = read_buf(xdr, 4); 84 if (unlikely(p == NULL)) 85 return htonl(NFS4ERR_RESOURCE); 86 *len = ntohl(*p); 87 88 if (*len != 0) { 89 p = read_buf(xdr, *len); 90 if (unlikely(p == NULL)) 91 return htonl(NFS4ERR_RESOURCE); 92 *str = (const char *)p; 93 } else 94 *str = NULL; 95 96 return 0; 97 } 98 99 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 100 { 101 __be32 *p; 102 103 p = read_buf(xdr, 4); 104 if (unlikely(p == NULL)) 105 return htonl(NFS4ERR_RESOURCE); 106 fh->size = ntohl(*p); 107 if (fh->size > NFS4_FHSIZE) 108 return htonl(NFS4ERR_BADHANDLE); 109 p = read_buf(xdr, fh->size); 110 if (unlikely(p == NULL)) 111 return htonl(NFS4ERR_RESOURCE); 112 memcpy(&fh->data[0], p, fh->size); 113 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 114 return 0; 115 } 116 117 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 118 { 119 __be32 *p; 120 unsigned int attrlen; 121 122 p = read_buf(xdr, 4); 123 if (unlikely(p == NULL)) 124 return htonl(NFS4ERR_RESOURCE); 125 attrlen = ntohl(*p); 126 p = read_buf(xdr, attrlen << 2); 127 if (unlikely(p == NULL)) 128 return htonl(NFS4ERR_RESOURCE); 129 if (likely(attrlen > 0)) 130 bitmap[0] = ntohl(*p++); 131 if (attrlen > 1) 132 bitmap[1] = ntohl(*p); 133 return 0; 134 } 135 136 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 137 { 138 __be32 *p; 139 140 p = read_buf(xdr, 16); 141 if (unlikely(p == NULL)) 142 return htonl(NFS4ERR_RESOURCE); 143 memcpy(stateid->data, p, 16); 144 return 0; 145 } 146 147 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 148 { 149 __be32 *p; 150 __be32 status; 151 152 status = decode_string(xdr, &hdr->taglen, &hdr->tag); 153 if (unlikely(status != 0)) 154 return status; 155 /* We do not like overly long tags! */ 156 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { 157 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n", 158 __func__, hdr->taglen); 159 return htonl(NFS4ERR_RESOURCE); 160 } 161 p = read_buf(xdr, 12); 162 if (unlikely(p == NULL)) 163 return htonl(NFS4ERR_RESOURCE); 164 hdr->minorversion = ntohl(*p++); 165 /* Check minor version is zero or one. */ 166 if (hdr->minorversion <= 1) { 167 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */ 168 } else { 169 printk(KERN_WARNING "%s: NFSv4 server callback with " 170 "illegal minor version %u!\n", 171 __func__, hdr->minorversion); 172 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 173 } 174 hdr->nops = ntohl(*p); 175 dprintk("%s: minorversion %d nops %d\n", __func__, 176 hdr->minorversion, hdr->nops); 177 return 0; 178 } 179 180 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 181 { 182 __be32 *p; 183 p = read_buf(xdr, 4); 184 if (unlikely(p == NULL)) 185 return htonl(NFS4ERR_RESOURCE_HDR); 186 *op = ntohl(*p); 187 return 0; 188 } 189 190 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 191 { 192 __be32 status; 193 194 status = decode_fh(xdr, &args->fh); 195 if (unlikely(status != 0)) 196 goto out; 197 args->addr = svc_addr(rqstp); 198 status = decode_bitmap(xdr, args->bitmap); 199 out: 200 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 201 return status; 202 } 203 204 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 205 { 206 __be32 *p; 207 __be32 status; 208 209 args->addr = svc_addr(rqstp); 210 status = decode_stateid(xdr, &args->stateid); 211 if (unlikely(status != 0)) 212 goto out; 213 p = read_buf(xdr, 4); 214 if (unlikely(p == NULL)) { 215 status = htonl(NFS4ERR_RESOURCE); 216 goto out; 217 } 218 args->truncate = ntohl(*p); 219 status = decode_fh(xdr, &args->fh); 220 out: 221 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 222 return status; 223 } 224 225 #if defined(CONFIG_NFS_V4_1) 226 227 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 228 struct xdr_stream *xdr, 229 struct cb_layoutrecallargs *args) 230 { 231 __be32 *p; 232 __be32 status = 0; 233 uint32_t iomode; 234 235 args->cbl_addr = svc_addr(rqstp); 236 p = read_buf(xdr, 4 * sizeof(uint32_t)); 237 if (unlikely(p == NULL)) { 238 status = htonl(NFS4ERR_BADXDR); 239 goto out; 240 } 241 242 args->cbl_layout_type = ntohl(*p++); 243 /* Depite the spec's xdr, iomode really belongs in the FILE switch, 244 * as it is unusable and ignored with the other types. 245 */ 246 iomode = ntohl(*p++); 247 args->cbl_layoutchanged = ntohl(*p++); 248 args->cbl_recall_type = ntohl(*p++); 249 250 if (args->cbl_recall_type == RETURN_FILE) { 251 args->cbl_range.iomode = iomode; 252 status = decode_fh(xdr, &args->cbl_fh); 253 if (unlikely(status != 0)) 254 goto out; 255 256 p = read_buf(xdr, 2 * sizeof(uint64_t)); 257 if (unlikely(p == NULL)) { 258 status = htonl(NFS4ERR_BADXDR); 259 goto out; 260 } 261 p = xdr_decode_hyper(p, &args->cbl_range.offset); 262 p = xdr_decode_hyper(p, &args->cbl_range.length); 263 status = decode_stateid(xdr, &args->cbl_stateid); 264 if (unlikely(status != 0)) 265 goto out; 266 } else if (args->cbl_recall_type == RETURN_FSID) { 267 p = read_buf(xdr, 2 * sizeof(uint64_t)); 268 if (unlikely(p == NULL)) { 269 status = htonl(NFS4ERR_BADXDR); 270 goto out; 271 } 272 p = xdr_decode_hyper(p, &args->cbl_fsid.major); 273 p = xdr_decode_hyper(p, &args->cbl_fsid.minor); 274 } else if (args->cbl_recall_type != RETURN_ALL) { 275 status = htonl(NFS4ERR_BADXDR); 276 goto out; 277 } 278 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n", 279 __func__, 280 args->cbl_layout_type, iomode, 281 args->cbl_layoutchanged, args->cbl_recall_type); 282 out: 283 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 284 return status; 285 } 286 287 static __be32 decode_sessionid(struct xdr_stream *xdr, 288 struct nfs4_sessionid *sid) 289 { 290 __be32 *p; 291 int len = NFS4_MAX_SESSIONID_LEN; 292 293 p = read_buf(xdr, len); 294 if (unlikely(p == NULL)) 295 return htonl(NFS4ERR_RESOURCE); 296 297 memcpy(sid->data, p, len); 298 return 0; 299 } 300 301 static __be32 decode_rc_list(struct xdr_stream *xdr, 302 struct referring_call_list *rc_list) 303 { 304 __be32 *p; 305 int i; 306 __be32 status; 307 308 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 309 if (status) 310 goto out; 311 312 status = htonl(NFS4ERR_RESOURCE); 313 p = read_buf(xdr, sizeof(uint32_t)); 314 if (unlikely(p == NULL)) 315 goto out; 316 317 rc_list->rcl_nrefcalls = ntohl(*p++); 318 if (rc_list->rcl_nrefcalls) { 319 p = read_buf(xdr, 320 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 321 if (unlikely(p == NULL)) 322 goto out; 323 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * 324 sizeof(*rc_list->rcl_refcalls), 325 GFP_KERNEL); 326 if (unlikely(rc_list->rcl_refcalls == NULL)) 327 goto out; 328 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 329 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 330 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 331 } 332 } 333 status = 0; 334 335 out: 336 return status; 337 } 338 339 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 340 struct xdr_stream *xdr, 341 struct cb_sequenceargs *args) 342 { 343 __be32 *p; 344 int i; 345 __be32 status; 346 347 status = decode_sessionid(xdr, &args->csa_sessionid); 348 if (status) 349 goto out; 350 351 status = htonl(NFS4ERR_RESOURCE); 352 p = read_buf(xdr, 5 * sizeof(uint32_t)); 353 if (unlikely(p == NULL)) 354 goto out; 355 356 args->csa_addr = svc_addr(rqstp); 357 args->csa_sequenceid = ntohl(*p++); 358 args->csa_slotid = ntohl(*p++); 359 args->csa_highestslotid = ntohl(*p++); 360 args->csa_cachethis = ntohl(*p++); 361 args->csa_nrclists = ntohl(*p++); 362 args->csa_rclists = NULL; 363 if (args->csa_nrclists) { 364 args->csa_rclists = kmalloc(args->csa_nrclists * 365 sizeof(*args->csa_rclists), 366 GFP_KERNEL); 367 if (unlikely(args->csa_rclists == NULL)) 368 goto out; 369 370 for (i = 0; i < args->csa_nrclists; i++) { 371 status = decode_rc_list(xdr, &args->csa_rclists[i]); 372 if (status) 373 goto out_free; 374 } 375 } 376 status = 0; 377 378 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 379 "highestslotid %u cachethis %d nrclists %u\n", 380 __func__, 381 ((u32 *)&args->csa_sessionid)[0], 382 ((u32 *)&args->csa_sessionid)[1], 383 ((u32 *)&args->csa_sessionid)[2], 384 ((u32 *)&args->csa_sessionid)[3], 385 args->csa_sequenceid, args->csa_slotid, 386 args->csa_highestslotid, args->csa_cachethis, 387 args->csa_nrclists); 388 out: 389 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 390 return status; 391 392 out_free: 393 for (i = 0; i < args->csa_nrclists; i++) 394 kfree(args->csa_rclists[i].rcl_refcalls); 395 kfree(args->csa_rclists); 396 goto out; 397 } 398 399 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 400 struct xdr_stream *xdr, 401 struct cb_recallanyargs *args) 402 { 403 __be32 *p; 404 405 args->craa_addr = svc_addr(rqstp); 406 p = read_buf(xdr, 4); 407 if (unlikely(p == NULL)) 408 return htonl(NFS4ERR_BADXDR); 409 args->craa_objs_to_keep = ntohl(*p++); 410 p = read_buf(xdr, 4); 411 if (unlikely(p == NULL)) 412 return htonl(NFS4ERR_BADXDR); 413 args->craa_type_mask = ntohl(*p); 414 415 return 0; 416 } 417 418 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 419 struct xdr_stream *xdr, 420 struct cb_recallslotargs *args) 421 { 422 __be32 *p; 423 424 args->crsa_addr = svc_addr(rqstp); 425 p = read_buf(xdr, 4); 426 if (unlikely(p == NULL)) 427 return htonl(NFS4ERR_BADXDR); 428 args->crsa_target_max_slots = ntohl(*p++); 429 return 0; 430 } 431 432 #endif /* CONFIG_NFS_V4_1 */ 433 434 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 435 { 436 __be32 *p; 437 438 p = xdr_reserve_space(xdr, 4 + len); 439 if (unlikely(p == NULL)) 440 return htonl(NFS4ERR_RESOURCE); 441 xdr_encode_opaque(p, str, len); 442 return 0; 443 } 444 445 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 446 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 447 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 448 { 449 __be32 bm[2]; 450 __be32 *p; 451 452 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 453 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 454 if (bm[1] != 0) { 455 p = xdr_reserve_space(xdr, 16); 456 if (unlikely(p == NULL)) 457 return htonl(NFS4ERR_RESOURCE); 458 *p++ = htonl(2); 459 *p++ = bm[0]; 460 *p++ = bm[1]; 461 } else if (bm[0] != 0) { 462 p = xdr_reserve_space(xdr, 12); 463 if (unlikely(p == NULL)) 464 return htonl(NFS4ERR_RESOURCE); 465 *p++ = htonl(1); 466 *p++ = bm[0]; 467 } else { 468 p = xdr_reserve_space(xdr, 8); 469 if (unlikely(p == NULL)) 470 return htonl(NFS4ERR_RESOURCE); 471 *p++ = htonl(0); 472 } 473 *savep = p; 474 return 0; 475 } 476 477 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 478 { 479 __be32 *p; 480 481 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 482 return 0; 483 p = xdr_reserve_space(xdr, 8); 484 if (unlikely(!p)) 485 return htonl(NFS4ERR_RESOURCE); 486 p = xdr_encode_hyper(p, change); 487 return 0; 488 } 489 490 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 491 { 492 __be32 *p; 493 494 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 495 return 0; 496 p = xdr_reserve_space(xdr, 8); 497 if (unlikely(!p)) 498 return htonl(NFS4ERR_RESOURCE); 499 p = xdr_encode_hyper(p, size); 500 return 0; 501 } 502 503 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 504 { 505 __be32 *p; 506 507 p = xdr_reserve_space(xdr, 12); 508 if (unlikely(!p)) 509 return htonl(NFS4ERR_RESOURCE); 510 p = xdr_encode_hyper(p, time->tv_sec); 511 *p = htonl(time->tv_nsec); 512 return 0; 513 } 514 515 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 516 { 517 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 518 return 0; 519 return encode_attr_time(xdr,time); 520 } 521 522 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 523 { 524 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 525 return 0; 526 return encode_attr_time(xdr,time); 527 } 528 529 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 530 { 531 __be32 status; 532 533 hdr->status = xdr_reserve_space(xdr, 4); 534 if (unlikely(hdr->status == NULL)) 535 return htonl(NFS4ERR_RESOURCE); 536 status = encode_string(xdr, hdr->taglen, hdr->tag); 537 if (unlikely(status != 0)) 538 return status; 539 hdr->nops = xdr_reserve_space(xdr, 4); 540 if (unlikely(hdr->nops == NULL)) 541 return htonl(NFS4ERR_RESOURCE); 542 return 0; 543 } 544 545 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 546 { 547 __be32 *p; 548 549 p = xdr_reserve_space(xdr, 8); 550 if (unlikely(p == NULL)) 551 return htonl(NFS4ERR_RESOURCE_HDR); 552 *p++ = htonl(op); 553 *p = res; 554 return 0; 555 } 556 557 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 558 { 559 __be32 *savep = NULL; 560 __be32 status = res->status; 561 562 if (unlikely(status != 0)) 563 goto out; 564 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 565 if (unlikely(status != 0)) 566 goto out; 567 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 568 if (unlikely(status != 0)) 569 goto out; 570 status = encode_attr_size(xdr, res->bitmap, res->size); 571 if (unlikely(status != 0)) 572 goto out; 573 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 574 if (unlikely(status != 0)) 575 goto out; 576 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 577 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 578 out: 579 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 580 return status; 581 } 582 583 #if defined(CONFIG_NFS_V4_1) 584 585 static __be32 encode_sessionid(struct xdr_stream *xdr, 586 const struct nfs4_sessionid *sid) 587 { 588 __be32 *p; 589 int len = NFS4_MAX_SESSIONID_LEN; 590 591 p = xdr_reserve_space(xdr, len); 592 if (unlikely(p == NULL)) 593 return htonl(NFS4ERR_RESOURCE); 594 595 memcpy(p, sid, len); 596 return 0; 597 } 598 599 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 600 struct xdr_stream *xdr, 601 const struct cb_sequenceres *res) 602 { 603 __be32 *p; 604 unsigned status = res->csr_status; 605 606 if (unlikely(status != 0)) 607 goto out; 608 609 encode_sessionid(xdr, &res->csr_sessionid); 610 611 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 612 if (unlikely(p == NULL)) 613 return htonl(NFS4ERR_RESOURCE); 614 615 *p++ = htonl(res->csr_sequenceid); 616 *p++ = htonl(res->csr_slotid); 617 *p++ = htonl(res->csr_highestslotid); 618 *p++ = htonl(res->csr_target_highestslotid); 619 out: 620 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 621 return status; 622 } 623 624 static __be32 625 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 626 { 627 if (op_nr == OP_CB_SEQUENCE) { 628 if (nop != 0) 629 return htonl(NFS4ERR_SEQUENCE_POS); 630 } else { 631 if (nop == 0) 632 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 633 } 634 635 switch (op_nr) { 636 case OP_CB_GETATTR: 637 case OP_CB_RECALL: 638 case OP_CB_SEQUENCE: 639 case OP_CB_RECALL_ANY: 640 case OP_CB_RECALL_SLOT: 641 case OP_CB_LAYOUTRECALL: 642 *op = &callback_ops[op_nr]; 643 break; 644 645 case OP_CB_NOTIFY_DEVICEID: 646 case OP_CB_NOTIFY: 647 case OP_CB_PUSH_DELEG: 648 case OP_CB_RECALLABLE_OBJ_AVAIL: 649 case OP_CB_WANTS_CANCELLED: 650 case OP_CB_NOTIFY_LOCK: 651 return htonl(NFS4ERR_NOTSUPP); 652 653 default: 654 return htonl(NFS4ERR_OP_ILLEGAL); 655 } 656 657 return htonl(NFS_OK); 658 } 659 660 static void nfs4_callback_free_slot(struct nfs4_session *session) 661 { 662 struct nfs4_slot_table *tbl = &session->bc_slot_table; 663 664 spin_lock(&tbl->slot_tbl_lock); 665 /* 666 * Let the state manager know callback processing done. 667 * A single slot, so highest used slotid is either 0 or -1 668 */ 669 tbl->highest_used_slotid--; 670 nfs4_check_drain_bc_complete(session); 671 spin_unlock(&tbl->slot_tbl_lock); 672 } 673 674 static void nfs4_cb_free_slot(struct nfs_client *clp) 675 { 676 if (clp && clp->cl_session) 677 nfs4_callback_free_slot(clp->cl_session); 678 } 679 680 /* A single slot, so highest used slotid is either 0 or -1 */ 681 void nfs4_cb_take_slot(struct nfs_client *clp) 682 { 683 struct nfs4_slot_table *tbl = &clp->cl_session->bc_slot_table; 684 685 spin_lock(&tbl->slot_tbl_lock); 686 tbl->highest_used_slotid++; 687 BUG_ON(tbl->highest_used_slotid != 0); 688 spin_unlock(&tbl->slot_tbl_lock); 689 } 690 691 #else /* CONFIG_NFS_V4_1 */ 692 693 static __be32 694 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 695 { 696 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 697 } 698 699 static void nfs4_cb_free_slot(struct nfs_client *clp) 700 { 701 } 702 #endif /* CONFIG_NFS_V4_1 */ 703 704 static __be32 705 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 706 { 707 switch (op_nr) { 708 case OP_CB_GETATTR: 709 case OP_CB_RECALL: 710 *op = &callback_ops[op_nr]; 711 break; 712 default: 713 return htonl(NFS4ERR_OP_ILLEGAL); 714 } 715 716 return htonl(NFS_OK); 717 } 718 719 static __be32 process_op(uint32_t minorversion, int nop, 720 struct svc_rqst *rqstp, 721 struct xdr_stream *xdr_in, void *argp, 722 struct xdr_stream *xdr_out, void *resp, 723 struct cb_process_state *cps) 724 { 725 struct callback_op *op = &callback_ops[0]; 726 unsigned int op_nr; 727 __be32 status; 728 long maxlen; 729 __be32 res; 730 731 dprintk("%s: start\n", __func__); 732 status = decode_op_hdr(xdr_in, &op_nr); 733 if (unlikely(status)) 734 return status; 735 736 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 737 __func__, minorversion, nop, op_nr); 738 739 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : 740 preprocess_nfs4_op(op_nr, &op); 741 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 742 op_nr = OP_CB_ILLEGAL; 743 if (status) 744 goto encode_hdr; 745 746 if (cps->drc_status) { 747 status = cps->drc_status; 748 goto encode_hdr; 749 } 750 751 maxlen = xdr_out->end - xdr_out->p; 752 if (maxlen > 0 && maxlen < PAGE_SIZE) { 753 status = op->decode_args(rqstp, xdr_in, argp); 754 if (likely(status == 0)) 755 status = op->process_op(argp, resp, cps); 756 } else 757 status = htonl(NFS4ERR_RESOURCE); 758 759 encode_hdr: 760 res = encode_op_hdr(xdr_out, op_nr, status); 761 if (unlikely(res)) 762 return res; 763 if (op->encode_res != NULL && status == 0) 764 status = op->encode_res(rqstp, xdr_out, resp); 765 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 766 return status; 767 } 768 769 /* 770 * Decode, process and encode a COMPOUND 771 */ 772 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 773 { 774 struct cb_compound_hdr_arg hdr_arg = { 0 }; 775 struct cb_compound_hdr_res hdr_res = { NULL }; 776 struct xdr_stream xdr_in, xdr_out; 777 __be32 *p, status; 778 struct cb_process_state cps = { 779 .drc_status = 0, 780 .clp = NULL, 781 }; 782 unsigned int nops = 0; 783 784 dprintk("%s: start\n", __func__); 785 786 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 787 788 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 789 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 790 791 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 792 if (status == __constant_htonl(NFS4ERR_RESOURCE)) 793 return rpc_garbage_args; 794 795 if (hdr_arg.minorversion == 0) { 796 cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident); 797 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 798 return rpc_drop_reply; 799 } 800 801 hdr_res.taglen = hdr_arg.taglen; 802 hdr_res.tag = hdr_arg.tag; 803 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 804 return rpc_system_err; 805 806 while (status == 0 && nops != hdr_arg.nops) { 807 status = process_op(hdr_arg.minorversion, nops, rqstp, 808 &xdr_in, argp, &xdr_out, resp, &cps); 809 nops++; 810 } 811 812 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 813 * resource error in cb_compound status without returning op */ 814 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 815 status = htonl(NFS4ERR_RESOURCE); 816 nops--; 817 } 818 819 *hdr_res.status = status; 820 *hdr_res.nops = htonl(nops); 821 nfs4_cb_free_slot(cps.clp); 822 nfs_put_client(cps.clp); 823 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 824 return rpc_success; 825 } 826 827 /* 828 * Define NFS4 callback COMPOUND ops. 829 */ 830 static struct callback_op callback_ops[] = { 831 [0] = { 832 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 833 }, 834 [OP_CB_GETATTR] = { 835 .process_op = (callback_process_op_t)nfs4_callback_getattr, 836 .decode_args = (callback_decode_arg_t)decode_getattr_args, 837 .encode_res = (callback_encode_res_t)encode_getattr_res, 838 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 839 }, 840 [OP_CB_RECALL] = { 841 .process_op = (callback_process_op_t)nfs4_callback_recall, 842 .decode_args = (callback_decode_arg_t)decode_recall_args, 843 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 844 }, 845 #if defined(CONFIG_NFS_V4_1) 846 [OP_CB_LAYOUTRECALL] = { 847 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall, 848 .decode_args = 849 (callback_decode_arg_t)decode_layoutrecall_args, 850 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 851 }, 852 [OP_CB_SEQUENCE] = { 853 .process_op = (callback_process_op_t)nfs4_callback_sequence, 854 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 855 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 856 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 857 }, 858 [OP_CB_RECALL_ANY] = { 859 .process_op = (callback_process_op_t)nfs4_callback_recallany, 860 .decode_args = (callback_decode_arg_t)decode_recallany_args, 861 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 862 }, 863 [OP_CB_RECALL_SLOT] = { 864 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 865 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 866 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 867 }, 868 #endif /* CONFIG_NFS_V4_1 */ 869 }; 870 871 /* 872 * Define NFS4 callback procedures 873 */ 874 static struct svc_procedure nfs4_callback_procedures1[] = { 875 [CB_NULL] = { 876 .pc_func = nfs4_callback_null, 877 .pc_decode = (kxdrproc_t)nfs4_decode_void, 878 .pc_encode = (kxdrproc_t)nfs4_encode_void, 879 .pc_xdrressize = 1, 880 }, 881 [CB_COMPOUND] = { 882 .pc_func = nfs4_callback_compound, 883 .pc_encode = (kxdrproc_t)nfs4_encode_void, 884 .pc_argsize = 256, 885 .pc_ressize = 256, 886 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 887 } 888 }; 889 890 struct svc_version nfs4_callback_version1 = { 891 .vs_vers = 1, 892 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 893 .vs_proc = nfs4_callback_procedures1, 894 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 895 .vs_dispatch = NULL, 896 .vs_hidden = 1, 897 }; 898 899 struct svc_version nfs4_callback_version4 = { 900 .vs_vers = 4, 901 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 902 .vs_proc = nfs4_callback_procedures1, 903 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 904 .vs_dispatch = NULL, 905 }; 906