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 "nfs4_fs.h" 14 #include "callback.h" 15 16 #define CB_OP_TAGLEN_MAXSZ (512) 17 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ) 18 #define CB_OP_GETATTR_BITMAP_MAXSZ (4) 19 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 20 CB_OP_GETATTR_BITMAP_MAXSZ + \ 21 2 + 2 + 3 + 3) 22 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 23 24 #if defined(CONFIG_NFS_V4_1) 25 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 26 4 + 1 + 3) 27 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 28 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 29 #endif /* CONFIG_NFS_V4_1 */ 30 31 #define NFSDBG_FACILITY NFSDBG_CALLBACK 32 33 /* Internal error code */ 34 #define NFS4ERR_RESOURCE_HDR 11050 35 36 typedef __be32 (*callback_process_op_t)(void *, void *); 37 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 38 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 39 40 41 struct callback_op { 42 callback_process_op_t process_op; 43 callback_decode_arg_t decode_args; 44 callback_encode_res_t encode_res; 45 long res_maxsize; 46 }; 47 48 static struct callback_op callback_ops[]; 49 50 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 51 { 52 return htonl(NFS4_OK); 53 } 54 55 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 56 { 57 return xdr_argsize_check(rqstp, p); 58 } 59 60 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 61 { 62 return xdr_ressize_check(rqstp, p); 63 } 64 65 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) 66 { 67 __be32 *p; 68 69 p = xdr_inline_decode(xdr, nbytes); 70 if (unlikely(p == NULL)) 71 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n"); 72 return p; 73 } 74 75 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 76 { 77 __be32 *p; 78 79 p = read_buf(xdr, 4); 80 if (unlikely(p == NULL)) 81 return htonl(NFS4ERR_RESOURCE); 82 *len = ntohl(*p); 83 84 if (*len != 0) { 85 p = read_buf(xdr, *len); 86 if (unlikely(p == NULL)) 87 return htonl(NFS4ERR_RESOURCE); 88 *str = (const char *)p; 89 } else 90 *str = NULL; 91 92 return 0; 93 } 94 95 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 96 { 97 __be32 *p; 98 99 p = read_buf(xdr, 4); 100 if (unlikely(p == NULL)) 101 return htonl(NFS4ERR_RESOURCE); 102 fh->size = ntohl(*p); 103 if (fh->size > NFS4_FHSIZE) 104 return htonl(NFS4ERR_BADHANDLE); 105 p = read_buf(xdr, fh->size); 106 if (unlikely(p == NULL)) 107 return htonl(NFS4ERR_RESOURCE); 108 memcpy(&fh->data[0], p, fh->size); 109 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 110 return 0; 111 } 112 113 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 114 { 115 __be32 *p; 116 unsigned int attrlen; 117 118 p = read_buf(xdr, 4); 119 if (unlikely(p == NULL)) 120 return htonl(NFS4ERR_RESOURCE); 121 attrlen = ntohl(*p); 122 p = read_buf(xdr, attrlen << 2); 123 if (unlikely(p == NULL)) 124 return htonl(NFS4ERR_RESOURCE); 125 if (likely(attrlen > 0)) 126 bitmap[0] = ntohl(*p++); 127 if (attrlen > 1) 128 bitmap[1] = ntohl(*p); 129 return 0; 130 } 131 132 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 133 { 134 __be32 *p; 135 136 p = read_buf(xdr, 16); 137 if (unlikely(p == NULL)) 138 return htonl(NFS4ERR_RESOURCE); 139 memcpy(stateid->data, p, 16); 140 return 0; 141 } 142 143 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 144 { 145 __be32 *p; 146 __be32 status; 147 148 status = decode_string(xdr, &hdr->taglen, &hdr->tag); 149 if (unlikely(status != 0)) 150 return status; 151 /* We do not like overly long tags! */ 152 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { 153 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n", 154 __func__, hdr->taglen); 155 return htonl(NFS4ERR_RESOURCE); 156 } 157 p = read_buf(xdr, 12); 158 if (unlikely(p == NULL)) 159 return htonl(NFS4ERR_RESOURCE); 160 hdr->minorversion = ntohl(*p++); 161 /* Check minor version is zero or one. */ 162 if (hdr->minorversion <= 1) { 163 p++; /* skip callback_ident */ 164 } else { 165 printk(KERN_WARNING "%s: NFSv4 server callback with " 166 "illegal minor version %u!\n", 167 __func__, hdr->minorversion); 168 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 169 } 170 hdr->nops = ntohl(*p); 171 dprintk("%s: minorversion %d nops %d\n", __func__, 172 hdr->minorversion, hdr->nops); 173 return 0; 174 } 175 176 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 177 { 178 __be32 *p; 179 p = read_buf(xdr, 4); 180 if (unlikely(p == NULL)) 181 return htonl(NFS4ERR_RESOURCE_HDR); 182 *op = ntohl(*p); 183 return 0; 184 } 185 186 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 187 { 188 __be32 status; 189 190 status = decode_fh(xdr, &args->fh); 191 if (unlikely(status != 0)) 192 goto out; 193 args->addr = svc_addr(rqstp); 194 status = decode_bitmap(xdr, args->bitmap); 195 out: 196 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 197 return status; 198 } 199 200 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 201 { 202 __be32 *p; 203 __be32 status; 204 205 args->addr = svc_addr(rqstp); 206 status = decode_stateid(xdr, &args->stateid); 207 if (unlikely(status != 0)) 208 goto out; 209 p = read_buf(xdr, 4); 210 if (unlikely(p == NULL)) { 211 status = htonl(NFS4ERR_RESOURCE); 212 goto out; 213 } 214 args->truncate = ntohl(*p); 215 status = decode_fh(xdr, &args->fh); 216 out: 217 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 218 return status; 219 } 220 221 #if defined(CONFIG_NFS_V4_1) 222 223 static __be32 decode_sessionid(struct xdr_stream *xdr, 224 struct nfs4_sessionid *sid) 225 { 226 __be32 *p; 227 int len = NFS4_MAX_SESSIONID_LEN; 228 229 p = read_buf(xdr, len); 230 if (unlikely(p == NULL)) 231 return htonl(NFS4ERR_RESOURCE); 232 233 memcpy(sid->data, p, len); 234 return 0; 235 } 236 237 static __be32 decode_rc_list(struct xdr_stream *xdr, 238 struct referring_call_list *rc_list) 239 { 240 __be32 *p; 241 int i; 242 __be32 status; 243 244 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 245 if (status) 246 goto out; 247 248 status = htonl(NFS4ERR_RESOURCE); 249 p = read_buf(xdr, sizeof(uint32_t)); 250 if (unlikely(p == NULL)) 251 goto out; 252 253 rc_list->rcl_nrefcalls = ntohl(*p++); 254 if (rc_list->rcl_nrefcalls) { 255 p = read_buf(xdr, 256 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 257 if (unlikely(p == NULL)) 258 goto out; 259 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * 260 sizeof(*rc_list->rcl_refcalls), 261 GFP_KERNEL); 262 if (unlikely(rc_list->rcl_refcalls == NULL)) 263 goto out; 264 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 265 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 266 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 267 } 268 } 269 status = 0; 270 271 out: 272 return status; 273 } 274 275 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 276 struct xdr_stream *xdr, 277 struct cb_sequenceargs *args) 278 { 279 __be32 *p; 280 int i; 281 __be32 status; 282 283 status = decode_sessionid(xdr, &args->csa_sessionid); 284 if (status) 285 goto out; 286 287 status = htonl(NFS4ERR_RESOURCE); 288 p = read_buf(xdr, 5 * sizeof(uint32_t)); 289 if (unlikely(p == NULL)) 290 goto out; 291 292 args->csa_addr = svc_addr(rqstp); 293 args->csa_sequenceid = ntohl(*p++); 294 args->csa_slotid = ntohl(*p++); 295 args->csa_highestslotid = ntohl(*p++); 296 args->csa_cachethis = ntohl(*p++); 297 args->csa_nrclists = ntohl(*p++); 298 args->csa_rclists = NULL; 299 if (args->csa_nrclists) { 300 args->csa_rclists = kmalloc(args->csa_nrclists * 301 sizeof(*args->csa_rclists), 302 GFP_KERNEL); 303 if (unlikely(args->csa_rclists == NULL)) 304 goto out; 305 306 for (i = 0; i < args->csa_nrclists; i++) { 307 status = decode_rc_list(xdr, &args->csa_rclists[i]); 308 if (status) 309 goto out_free; 310 } 311 } 312 status = 0; 313 314 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 315 "highestslotid %u cachethis %d nrclists %u\n", 316 __func__, 317 ((u32 *)&args->csa_sessionid)[0], 318 ((u32 *)&args->csa_sessionid)[1], 319 ((u32 *)&args->csa_sessionid)[2], 320 ((u32 *)&args->csa_sessionid)[3], 321 args->csa_sequenceid, args->csa_slotid, 322 args->csa_highestslotid, args->csa_cachethis, 323 args->csa_nrclists); 324 out: 325 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 326 return status; 327 328 out_free: 329 for (i = 0; i < args->csa_nrclists; i++) 330 kfree(args->csa_rclists[i].rcl_refcalls); 331 kfree(args->csa_rclists); 332 goto out; 333 } 334 335 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 336 struct xdr_stream *xdr, 337 struct cb_recallanyargs *args) 338 { 339 __be32 *p; 340 341 args->craa_addr = svc_addr(rqstp); 342 p = read_buf(xdr, 4); 343 if (unlikely(p == NULL)) 344 return htonl(NFS4ERR_BADXDR); 345 args->craa_objs_to_keep = ntohl(*p++); 346 p = read_buf(xdr, 4); 347 if (unlikely(p == NULL)) 348 return htonl(NFS4ERR_BADXDR); 349 args->craa_type_mask = ntohl(*p); 350 351 return 0; 352 } 353 354 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 355 struct xdr_stream *xdr, 356 struct cb_recallslotargs *args) 357 { 358 __be32 *p; 359 360 args->crsa_addr = svc_addr(rqstp); 361 p = read_buf(xdr, 4); 362 if (unlikely(p == NULL)) 363 return htonl(NFS4ERR_BADXDR); 364 args->crsa_target_max_slots = ntohl(*p++); 365 return 0; 366 } 367 368 #endif /* CONFIG_NFS_V4_1 */ 369 370 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 371 { 372 __be32 *p; 373 374 p = xdr_reserve_space(xdr, 4 + len); 375 if (unlikely(p == NULL)) 376 return htonl(NFS4ERR_RESOURCE); 377 xdr_encode_opaque(p, str, len); 378 return 0; 379 } 380 381 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 382 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 383 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 384 { 385 __be32 bm[2]; 386 __be32 *p; 387 388 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 389 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 390 if (bm[1] != 0) { 391 p = xdr_reserve_space(xdr, 16); 392 if (unlikely(p == NULL)) 393 return htonl(NFS4ERR_RESOURCE); 394 *p++ = htonl(2); 395 *p++ = bm[0]; 396 *p++ = bm[1]; 397 } else if (bm[0] != 0) { 398 p = xdr_reserve_space(xdr, 12); 399 if (unlikely(p == NULL)) 400 return htonl(NFS4ERR_RESOURCE); 401 *p++ = htonl(1); 402 *p++ = bm[0]; 403 } else { 404 p = xdr_reserve_space(xdr, 8); 405 if (unlikely(p == NULL)) 406 return htonl(NFS4ERR_RESOURCE); 407 *p++ = htonl(0); 408 } 409 *savep = p; 410 return 0; 411 } 412 413 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 414 { 415 __be32 *p; 416 417 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 418 return 0; 419 p = xdr_reserve_space(xdr, 8); 420 if (unlikely(!p)) 421 return htonl(NFS4ERR_RESOURCE); 422 p = xdr_encode_hyper(p, change); 423 return 0; 424 } 425 426 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 427 { 428 __be32 *p; 429 430 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 431 return 0; 432 p = xdr_reserve_space(xdr, 8); 433 if (unlikely(!p)) 434 return htonl(NFS4ERR_RESOURCE); 435 p = xdr_encode_hyper(p, size); 436 return 0; 437 } 438 439 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 440 { 441 __be32 *p; 442 443 p = xdr_reserve_space(xdr, 12); 444 if (unlikely(!p)) 445 return htonl(NFS4ERR_RESOURCE); 446 p = xdr_encode_hyper(p, time->tv_sec); 447 *p = htonl(time->tv_nsec); 448 return 0; 449 } 450 451 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 452 { 453 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 454 return 0; 455 return encode_attr_time(xdr,time); 456 } 457 458 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 459 { 460 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 461 return 0; 462 return encode_attr_time(xdr,time); 463 } 464 465 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 466 { 467 __be32 status; 468 469 hdr->status = xdr_reserve_space(xdr, 4); 470 if (unlikely(hdr->status == NULL)) 471 return htonl(NFS4ERR_RESOURCE); 472 status = encode_string(xdr, hdr->taglen, hdr->tag); 473 if (unlikely(status != 0)) 474 return status; 475 hdr->nops = xdr_reserve_space(xdr, 4); 476 if (unlikely(hdr->nops == NULL)) 477 return htonl(NFS4ERR_RESOURCE); 478 return 0; 479 } 480 481 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 482 { 483 __be32 *p; 484 485 p = xdr_reserve_space(xdr, 8); 486 if (unlikely(p == NULL)) 487 return htonl(NFS4ERR_RESOURCE_HDR); 488 *p++ = htonl(op); 489 *p = res; 490 return 0; 491 } 492 493 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 494 { 495 __be32 *savep = NULL; 496 __be32 status = res->status; 497 498 if (unlikely(status != 0)) 499 goto out; 500 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 501 if (unlikely(status != 0)) 502 goto out; 503 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 504 if (unlikely(status != 0)) 505 goto out; 506 status = encode_attr_size(xdr, res->bitmap, res->size); 507 if (unlikely(status != 0)) 508 goto out; 509 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 510 if (unlikely(status != 0)) 511 goto out; 512 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 513 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 514 out: 515 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 516 return status; 517 } 518 519 #if defined(CONFIG_NFS_V4_1) 520 521 static __be32 encode_sessionid(struct xdr_stream *xdr, 522 const struct nfs4_sessionid *sid) 523 { 524 __be32 *p; 525 int len = NFS4_MAX_SESSIONID_LEN; 526 527 p = xdr_reserve_space(xdr, len); 528 if (unlikely(p == NULL)) 529 return htonl(NFS4ERR_RESOURCE); 530 531 memcpy(p, sid, len); 532 return 0; 533 } 534 535 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 536 struct xdr_stream *xdr, 537 const struct cb_sequenceres *res) 538 { 539 __be32 *p; 540 unsigned status = res->csr_status; 541 542 if (unlikely(status != 0)) 543 goto out; 544 545 encode_sessionid(xdr, &res->csr_sessionid); 546 547 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 548 if (unlikely(p == NULL)) 549 return htonl(NFS4ERR_RESOURCE); 550 551 *p++ = htonl(res->csr_sequenceid); 552 *p++ = htonl(res->csr_slotid); 553 *p++ = htonl(res->csr_highestslotid); 554 *p++ = htonl(res->csr_target_highestslotid); 555 out: 556 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 557 return status; 558 } 559 560 static __be32 561 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 562 { 563 if (op_nr == OP_CB_SEQUENCE) { 564 if (nop != 0) 565 return htonl(NFS4ERR_SEQUENCE_POS); 566 } else { 567 if (nop == 0) 568 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 569 } 570 571 switch (op_nr) { 572 case OP_CB_GETATTR: 573 case OP_CB_RECALL: 574 case OP_CB_SEQUENCE: 575 case OP_CB_RECALL_ANY: 576 case OP_CB_RECALL_SLOT: 577 *op = &callback_ops[op_nr]; 578 break; 579 580 case OP_CB_LAYOUTRECALL: 581 case OP_CB_NOTIFY_DEVICEID: 582 case OP_CB_NOTIFY: 583 case OP_CB_PUSH_DELEG: 584 case OP_CB_RECALLABLE_OBJ_AVAIL: 585 case OP_CB_WANTS_CANCELLED: 586 case OP_CB_NOTIFY_LOCK: 587 return htonl(NFS4ERR_NOTSUPP); 588 589 default: 590 return htonl(NFS4ERR_OP_ILLEGAL); 591 } 592 593 return htonl(NFS_OK); 594 } 595 596 #else /* CONFIG_NFS_V4_1 */ 597 598 static __be32 599 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 600 { 601 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 602 } 603 604 #endif /* CONFIG_NFS_V4_1 */ 605 606 static __be32 607 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 608 { 609 switch (op_nr) { 610 case OP_CB_GETATTR: 611 case OP_CB_RECALL: 612 *op = &callback_ops[op_nr]; 613 break; 614 default: 615 return htonl(NFS4ERR_OP_ILLEGAL); 616 } 617 618 return htonl(NFS_OK); 619 } 620 621 static __be32 process_op(uint32_t minorversion, int nop, 622 struct svc_rqst *rqstp, 623 struct xdr_stream *xdr_in, void *argp, 624 struct xdr_stream *xdr_out, void *resp, int* drc_status) 625 { 626 struct callback_op *op = &callback_ops[0]; 627 unsigned int op_nr; 628 __be32 status; 629 long maxlen; 630 __be32 res; 631 632 dprintk("%s: start\n", __func__); 633 status = decode_op_hdr(xdr_in, &op_nr); 634 if (unlikely(status)) 635 return status; 636 637 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 638 __func__, minorversion, nop, op_nr); 639 640 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : 641 preprocess_nfs4_op(op_nr, &op); 642 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 643 op_nr = OP_CB_ILLEGAL; 644 if (status) 645 goto encode_hdr; 646 647 if (*drc_status) { 648 status = *drc_status; 649 goto encode_hdr; 650 } 651 652 maxlen = xdr_out->end - xdr_out->p; 653 if (maxlen > 0 && maxlen < PAGE_SIZE) { 654 status = op->decode_args(rqstp, xdr_in, argp); 655 if (likely(status == 0)) 656 status = op->process_op(argp, resp); 657 } else 658 status = htonl(NFS4ERR_RESOURCE); 659 660 /* Only set by OP_CB_SEQUENCE processing */ 661 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 662 *drc_status = status; 663 status = 0; 664 } 665 666 encode_hdr: 667 res = encode_op_hdr(xdr_out, op_nr, status); 668 if (unlikely(res)) 669 return res; 670 if (op->encode_res != NULL && status == 0) 671 status = op->encode_res(rqstp, xdr_out, resp); 672 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 673 return status; 674 } 675 676 /* 677 * Decode, process and encode a COMPOUND 678 */ 679 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 680 { 681 struct cb_compound_hdr_arg hdr_arg = { 0 }; 682 struct cb_compound_hdr_res hdr_res = { NULL }; 683 struct xdr_stream xdr_in, xdr_out; 684 __be32 *p; 685 __be32 status, drc_status = 0; 686 unsigned int nops = 0; 687 688 dprintk("%s: start\n", __func__); 689 690 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 691 692 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 693 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 694 695 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 696 if (status == __constant_htonl(NFS4ERR_RESOURCE)) 697 return rpc_garbage_args; 698 699 hdr_res.taglen = hdr_arg.taglen; 700 hdr_res.tag = hdr_arg.tag; 701 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 702 return rpc_system_err; 703 704 while (status == 0 && nops != hdr_arg.nops) { 705 status = process_op(hdr_arg.minorversion, nops, rqstp, 706 &xdr_in, argp, &xdr_out, resp, &drc_status); 707 nops++; 708 } 709 710 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 711 * resource error in cb_compound status without returning op */ 712 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 713 status = htonl(NFS4ERR_RESOURCE); 714 nops--; 715 } 716 717 *hdr_res.status = status; 718 *hdr_res.nops = htonl(nops); 719 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 720 return rpc_success; 721 } 722 723 /* 724 * Define NFS4 callback COMPOUND ops. 725 */ 726 static struct callback_op callback_ops[] = { 727 [0] = { 728 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 729 }, 730 [OP_CB_GETATTR] = { 731 .process_op = (callback_process_op_t)nfs4_callback_getattr, 732 .decode_args = (callback_decode_arg_t)decode_getattr_args, 733 .encode_res = (callback_encode_res_t)encode_getattr_res, 734 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 735 }, 736 [OP_CB_RECALL] = { 737 .process_op = (callback_process_op_t)nfs4_callback_recall, 738 .decode_args = (callback_decode_arg_t)decode_recall_args, 739 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 740 }, 741 #if defined(CONFIG_NFS_V4_1) 742 [OP_CB_SEQUENCE] = { 743 .process_op = (callback_process_op_t)nfs4_callback_sequence, 744 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 745 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 746 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 747 }, 748 [OP_CB_RECALL_ANY] = { 749 .process_op = (callback_process_op_t)nfs4_callback_recallany, 750 .decode_args = (callback_decode_arg_t)decode_recallany_args, 751 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 752 }, 753 [OP_CB_RECALL_SLOT] = { 754 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 755 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 756 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 757 }, 758 #endif /* CONFIG_NFS_V4_1 */ 759 }; 760 761 /* 762 * Define NFS4 callback procedures 763 */ 764 static struct svc_procedure nfs4_callback_procedures1[] = { 765 [CB_NULL] = { 766 .pc_func = nfs4_callback_null, 767 .pc_decode = (kxdrproc_t)nfs4_decode_void, 768 .pc_encode = (kxdrproc_t)nfs4_encode_void, 769 .pc_xdrressize = 1, 770 }, 771 [CB_COMPOUND] = { 772 .pc_func = nfs4_callback_compound, 773 .pc_encode = (kxdrproc_t)nfs4_encode_void, 774 .pc_argsize = 256, 775 .pc_ressize = 256, 776 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 777 } 778 }; 779 780 struct svc_version nfs4_callback_version1 = { 781 .vs_vers = 1, 782 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 783 .vs_proc = nfs4_callback_procedures1, 784 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 785 .vs_dispatch = NULL, 786 .vs_hidden = 1, 787 }; 788 789 struct svc_version nfs4_callback_version4 = { 790 .vs_vers = 4, 791 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 792 .vs_proc = nfs4_callback_procedures1, 793 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 794 .vs_dispatch = NULL, 795 }; 796