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 "nfs4_fs.h" 13 #include "callback.h" 14 15 #define CB_OP_TAGLEN_MAXSZ (512) 16 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ) 17 #define CB_OP_GETATTR_BITMAP_MAXSZ (4) 18 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 19 CB_OP_GETATTR_BITMAP_MAXSZ + \ 20 2 + 2 + 3 + 3) 21 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 22 23 #if defined(CONFIG_NFS_V4_1) 24 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 25 4 + 1 + 3) 26 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 27 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 28 #endif /* CONFIG_NFS_V4_1 */ 29 30 #define NFSDBG_FACILITY NFSDBG_CALLBACK 31 32 /* Internal error code */ 33 #define NFS4ERR_RESOURCE_HDR 11050 34 35 typedef __be32 (*callback_process_op_t)(void *, void *); 36 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 37 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 38 39 40 struct callback_op { 41 callback_process_op_t process_op; 42 callback_decode_arg_t decode_args; 43 callback_encode_res_t encode_res; 44 long res_maxsize; 45 }; 46 47 static struct callback_op callback_ops[]; 48 49 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 50 { 51 return htonl(NFS4_OK); 52 } 53 54 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 55 { 56 return xdr_argsize_check(rqstp, p); 57 } 58 59 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 60 { 61 return xdr_ressize_check(rqstp, p); 62 } 63 64 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) 65 { 66 __be32 *p; 67 68 p = xdr_inline_decode(xdr, nbytes); 69 if (unlikely(p == NULL)) 70 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n"); 71 return p; 72 } 73 74 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 75 { 76 __be32 *p; 77 78 p = read_buf(xdr, 4); 79 if (unlikely(p == NULL)) 80 return htonl(NFS4ERR_RESOURCE); 81 *len = ntohl(*p); 82 83 if (*len != 0) { 84 p = read_buf(xdr, *len); 85 if (unlikely(p == NULL)) 86 return htonl(NFS4ERR_RESOURCE); 87 *str = (const char *)p; 88 } else 89 *str = NULL; 90 91 return 0; 92 } 93 94 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 95 { 96 __be32 *p; 97 98 p = read_buf(xdr, 4); 99 if (unlikely(p == NULL)) 100 return htonl(NFS4ERR_RESOURCE); 101 fh->size = ntohl(*p); 102 if (fh->size > NFS4_FHSIZE) 103 return htonl(NFS4ERR_BADHANDLE); 104 p = read_buf(xdr, fh->size); 105 if (unlikely(p == NULL)) 106 return htonl(NFS4ERR_RESOURCE); 107 memcpy(&fh->data[0], p, fh->size); 108 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 109 return 0; 110 } 111 112 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 113 { 114 __be32 *p; 115 unsigned int attrlen; 116 117 p = read_buf(xdr, 4); 118 if (unlikely(p == NULL)) 119 return htonl(NFS4ERR_RESOURCE); 120 attrlen = ntohl(*p); 121 p = read_buf(xdr, attrlen << 2); 122 if (unlikely(p == NULL)) 123 return htonl(NFS4ERR_RESOURCE); 124 if (likely(attrlen > 0)) 125 bitmap[0] = ntohl(*p++); 126 if (attrlen > 1) 127 bitmap[1] = ntohl(*p); 128 return 0; 129 } 130 131 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 132 { 133 __be32 *p; 134 135 p = read_buf(xdr, 16); 136 if (unlikely(p == NULL)) 137 return htonl(NFS4ERR_RESOURCE); 138 memcpy(stateid->data, p, 16); 139 return 0; 140 } 141 142 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 143 { 144 __be32 *p; 145 __be32 status; 146 147 status = decode_string(xdr, &hdr->taglen, &hdr->tag); 148 if (unlikely(status != 0)) 149 return status; 150 /* We do not like overly long tags! */ 151 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { 152 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n", 153 __func__, hdr->taglen); 154 return htonl(NFS4ERR_RESOURCE); 155 } 156 p = read_buf(xdr, 12); 157 if (unlikely(p == NULL)) 158 return htonl(NFS4ERR_RESOURCE); 159 hdr->minorversion = ntohl(*p++); 160 /* Check minor version is zero or one. */ 161 if (hdr->minorversion <= 1) { 162 p++; /* skip callback_ident */ 163 } else { 164 printk(KERN_WARNING "%s: NFSv4 server callback with " 165 "illegal minor version %u!\n", 166 __func__, hdr->minorversion); 167 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 168 } 169 hdr->nops = ntohl(*p); 170 dprintk("%s: minorversion %d nops %d\n", __func__, 171 hdr->minorversion, hdr->nops); 172 return 0; 173 } 174 175 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 176 { 177 __be32 *p; 178 p = read_buf(xdr, 4); 179 if (unlikely(p == NULL)) 180 return htonl(NFS4ERR_RESOURCE_HDR); 181 *op = ntohl(*p); 182 return 0; 183 } 184 185 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 186 { 187 __be32 status; 188 189 status = decode_fh(xdr, &args->fh); 190 if (unlikely(status != 0)) 191 goto out; 192 args->addr = svc_addr(rqstp); 193 status = decode_bitmap(xdr, args->bitmap); 194 out: 195 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 196 return status; 197 } 198 199 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 200 { 201 __be32 *p; 202 __be32 status; 203 204 args->addr = svc_addr(rqstp); 205 status = decode_stateid(xdr, &args->stateid); 206 if (unlikely(status != 0)) 207 goto out; 208 p = read_buf(xdr, 4); 209 if (unlikely(p == NULL)) { 210 status = htonl(NFS4ERR_RESOURCE); 211 goto out; 212 } 213 args->truncate = ntohl(*p); 214 status = decode_fh(xdr, &args->fh); 215 out: 216 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 217 return status; 218 } 219 220 #if defined(CONFIG_NFS_V4_1) 221 222 static unsigned decode_sessionid(struct xdr_stream *xdr, 223 struct nfs4_sessionid *sid) 224 { 225 uint32_t *p; 226 int len = NFS4_MAX_SESSIONID_LEN; 227 228 p = read_buf(xdr, len); 229 if (unlikely(p == NULL)) 230 return htonl(NFS4ERR_RESOURCE); 231 232 memcpy(sid->data, p, len); 233 return 0; 234 } 235 236 static unsigned decode_rc_list(struct xdr_stream *xdr, 237 struct referring_call_list *rc_list) 238 { 239 uint32_t *p; 240 int i; 241 unsigned status; 242 243 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 244 if (status) 245 goto out; 246 247 status = htonl(NFS4ERR_RESOURCE); 248 p = read_buf(xdr, sizeof(uint32_t)); 249 if (unlikely(p == NULL)) 250 goto out; 251 252 rc_list->rcl_nrefcalls = ntohl(*p++); 253 if (rc_list->rcl_nrefcalls) { 254 p = read_buf(xdr, 255 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 256 if (unlikely(p == NULL)) 257 goto out; 258 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * 259 sizeof(*rc_list->rcl_refcalls), 260 GFP_KERNEL); 261 if (unlikely(rc_list->rcl_refcalls == NULL)) 262 goto out; 263 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 264 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 265 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 266 } 267 } 268 status = 0; 269 270 out: 271 return status; 272 } 273 274 static unsigned decode_cb_sequence_args(struct svc_rqst *rqstp, 275 struct xdr_stream *xdr, 276 struct cb_sequenceargs *args) 277 { 278 uint32_t *p; 279 int i; 280 unsigned status; 281 282 status = decode_sessionid(xdr, &args->csa_sessionid); 283 if (status) 284 goto out; 285 286 status = htonl(NFS4ERR_RESOURCE); 287 p = read_buf(xdr, 5 * sizeof(uint32_t)); 288 if (unlikely(p == NULL)) 289 goto out; 290 291 args->csa_addr = svc_addr(rqstp); 292 args->csa_sequenceid = ntohl(*p++); 293 args->csa_slotid = ntohl(*p++); 294 args->csa_highestslotid = ntohl(*p++); 295 args->csa_cachethis = ntohl(*p++); 296 args->csa_nrclists = ntohl(*p++); 297 args->csa_rclists = NULL; 298 if (args->csa_nrclists) { 299 args->csa_rclists = kmalloc(args->csa_nrclists * 300 sizeof(*args->csa_rclists), 301 GFP_KERNEL); 302 if (unlikely(args->csa_rclists == NULL)) 303 goto out; 304 305 for (i = 0; i < args->csa_nrclists; i++) { 306 status = decode_rc_list(xdr, &args->csa_rclists[i]); 307 if (status) 308 goto out_free; 309 } 310 } 311 status = 0; 312 313 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 314 "highestslotid %u cachethis %d nrclists %u\n", 315 __func__, 316 ((u32 *)&args->csa_sessionid)[0], 317 ((u32 *)&args->csa_sessionid)[1], 318 ((u32 *)&args->csa_sessionid)[2], 319 ((u32 *)&args->csa_sessionid)[3], 320 args->csa_sequenceid, args->csa_slotid, 321 args->csa_highestslotid, args->csa_cachethis, 322 args->csa_nrclists); 323 out: 324 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 325 return status; 326 327 out_free: 328 for (i = 0; i < args->csa_nrclists; i++) 329 kfree(args->csa_rclists[i].rcl_refcalls); 330 kfree(args->csa_rclists); 331 goto out; 332 } 333 334 static unsigned decode_recallany_args(struct svc_rqst *rqstp, 335 struct xdr_stream *xdr, 336 struct cb_recallanyargs *args) 337 { 338 uint32_t *p; 339 340 args->craa_addr = svc_addr(rqstp); 341 p = read_buf(xdr, 4); 342 if (unlikely(p == NULL)) 343 return htonl(NFS4ERR_BADXDR); 344 args->craa_objs_to_keep = ntohl(*p++); 345 p = read_buf(xdr, 4); 346 if (unlikely(p == NULL)) 347 return htonl(NFS4ERR_BADXDR); 348 args->craa_type_mask = ntohl(*p); 349 350 return 0; 351 } 352 353 static unsigned decode_recallslot_args(struct svc_rqst *rqstp, 354 struct xdr_stream *xdr, 355 struct cb_recallslotargs *args) 356 { 357 __be32 *p; 358 359 args->crsa_addr = svc_addr(rqstp); 360 p = read_buf(xdr, 4); 361 if (unlikely(p == NULL)) 362 return htonl(NFS4ERR_BADXDR); 363 args->crsa_target_max_slots = ntohl(*p++); 364 return 0; 365 } 366 367 #endif /* CONFIG_NFS_V4_1 */ 368 369 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 370 { 371 __be32 *p; 372 373 p = xdr_reserve_space(xdr, 4 + len); 374 if (unlikely(p == NULL)) 375 return htonl(NFS4ERR_RESOURCE); 376 xdr_encode_opaque(p, str, len); 377 return 0; 378 } 379 380 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 381 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 382 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 383 { 384 __be32 bm[2]; 385 __be32 *p; 386 387 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 388 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 389 if (bm[1] != 0) { 390 p = xdr_reserve_space(xdr, 16); 391 if (unlikely(p == NULL)) 392 return htonl(NFS4ERR_RESOURCE); 393 *p++ = htonl(2); 394 *p++ = bm[0]; 395 *p++ = bm[1]; 396 } else if (bm[0] != 0) { 397 p = xdr_reserve_space(xdr, 12); 398 if (unlikely(p == NULL)) 399 return htonl(NFS4ERR_RESOURCE); 400 *p++ = htonl(1); 401 *p++ = bm[0]; 402 } else { 403 p = xdr_reserve_space(xdr, 8); 404 if (unlikely(p == NULL)) 405 return htonl(NFS4ERR_RESOURCE); 406 *p++ = htonl(0); 407 } 408 *savep = p; 409 return 0; 410 } 411 412 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 413 { 414 __be32 *p; 415 416 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 417 return 0; 418 p = xdr_reserve_space(xdr, 8); 419 if (unlikely(!p)) 420 return htonl(NFS4ERR_RESOURCE); 421 p = xdr_encode_hyper(p, change); 422 return 0; 423 } 424 425 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 426 { 427 __be32 *p; 428 429 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 430 return 0; 431 p = xdr_reserve_space(xdr, 8); 432 if (unlikely(!p)) 433 return htonl(NFS4ERR_RESOURCE); 434 p = xdr_encode_hyper(p, size); 435 return 0; 436 } 437 438 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 439 { 440 __be32 *p; 441 442 p = xdr_reserve_space(xdr, 12); 443 if (unlikely(!p)) 444 return htonl(NFS4ERR_RESOURCE); 445 p = xdr_encode_hyper(p, time->tv_sec); 446 *p = htonl(time->tv_nsec); 447 return 0; 448 } 449 450 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 451 { 452 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 453 return 0; 454 return encode_attr_time(xdr,time); 455 } 456 457 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 458 { 459 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 460 return 0; 461 return encode_attr_time(xdr,time); 462 } 463 464 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 465 { 466 __be32 status; 467 468 hdr->status = xdr_reserve_space(xdr, 4); 469 if (unlikely(hdr->status == NULL)) 470 return htonl(NFS4ERR_RESOURCE); 471 status = encode_string(xdr, hdr->taglen, hdr->tag); 472 if (unlikely(status != 0)) 473 return status; 474 hdr->nops = xdr_reserve_space(xdr, 4); 475 if (unlikely(hdr->nops == NULL)) 476 return htonl(NFS4ERR_RESOURCE); 477 return 0; 478 } 479 480 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 481 { 482 __be32 *p; 483 484 p = xdr_reserve_space(xdr, 8); 485 if (unlikely(p == NULL)) 486 return htonl(NFS4ERR_RESOURCE_HDR); 487 *p++ = htonl(op); 488 *p = res; 489 return 0; 490 } 491 492 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 493 { 494 __be32 *savep = NULL; 495 __be32 status = res->status; 496 497 if (unlikely(status != 0)) 498 goto out; 499 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 500 if (unlikely(status != 0)) 501 goto out; 502 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 503 if (unlikely(status != 0)) 504 goto out; 505 status = encode_attr_size(xdr, res->bitmap, res->size); 506 if (unlikely(status != 0)) 507 goto out; 508 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 509 if (unlikely(status != 0)) 510 goto out; 511 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 512 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 513 out: 514 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 515 return status; 516 } 517 518 #if defined(CONFIG_NFS_V4_1) 519 520 static unsigned encode_sessionid(struct xdr_stream *xdr, 521 const struct nfs4_sessionid *sid) 522 { 523 uint32_t *p; 524 int len = NFS4_MAX_SESSIONID_LEN; 525 526 p = xdr_reserve_space(xdr, len); 527 if (unlikely(p == NULL)) 528 return htonl(NFS4ERR_RESOURCE); 529 530 memcpy(p, sid, len); 531 return 0; 532 } 533 534 static unsigned encode_cb_sequence_res(struct svc_rqst *rqstp, 535 struct xdr_stream *xdr, 536 const struct cb_sequenceres *res) 537 { 538 uint32_t *p; 539 unsigned status = res->csr_status; 540 541 if (unlikely(status != 0)) 542 goto out; 543 544 encode_sessionid(xdr, &res->csr_sessionid); 545 546 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 547 if (unlikely(p == NULL)) 548 return htonl(NFS4ERR_RESOURCE); 549 550 *p++ = htonl(res->csr_sequenceid); 551 *p++ = htonl(res->csr_slotid); 552 *p++ = htonl(res->csr_highestslotid); 553 *p++ = htonl(res->csr_target_highestslotid); 554 out: 555 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 556 return status; 557 } 558 559 static __be32 560 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 561 { 562 if (op_nr == OP_CB_SEQUENCE) { 563 if (nop != 0) 564 return htonl(NFS4ERR_SEQUENCE_POS); 565 } else { 566 if (nop == 0) 567 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 568 } 569 570 switch (op_nr) { 571 case OP_CB_GETATTR: 572 case OP_CB_RECALL: 573 case OP_CB_SEQUENCE: 574 case OP_CB_RECALL_ANY: 575 case OP_CB_RECALL_SLOT: 576 *op = &callback_ops[op_nr]; 577 break; 578 579 case OP_CB_LAYOUTRECALL: 580 case OP_CB_NOTIFY_DEVICEID: 581 case OP_CB_NOTIFY: 582 case OP_CB_PUSH_DELEG: 583 case OP_CB_RECALLABLE_OBJ_AVAIL: 584 case OP_CB_WANTS_CANCELLED: 585 case OP_CB_NOTIFY_LOCK: 586 return htonl(NFS4ERR_NOTSUPP); 587 588 default: 589 return htonl(NFS4ERR_OP_ILLEGAL); 590 } 591 592 return htonl(NFS_OK); 593 } 594 595 #else /* CONFIG_NFS_V4_1 */ 596 597 static __be32 598 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 599 { 600 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 601 } 602 603 #endif /* CONFIG_NFS_V4_1 */ 604 605 static __be32 606 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 607 { 608 switch (op_nr) { 609 case OP_CB_GETATTR: 610 case OP_CB_RECALL: 611 *op = &callback_ops[op_nr]; 612 break; 613 default: 614 return htonl(NFS4ERR_OP_ILLEGAL); 615 } 616 617 return htonl(NFS_OK); 618 } 619 620 static __be32 process_op(uint32_t minorversion, int nop, 621 struct svc_rqst *rqstp, 622 struct xdr_stream *xdr_in, void *argp, 623 struct xdr_stream *xdr_out, void *resp, int* drc_status) 624 { 625 struct callback_op *op = &callback_ops[0]; 626 unsigned int op_nr; 627 __be32 status; 628 long maxlen; 629 __be32 res; 630 631 dprintk("%s: start\n", __func__); 632 status = decode_op_hdr(xdr_in, &op_nr); 633 if (unlikely(status)) 634 return status; 635 636 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 637 __func__, minorversion, nop, op_nr); 638 639 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : 640 preprocess_nfs4_op(op_nr, &op); 641 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 642 op_nr = OP_CB_ILLEGAL; 643 if (status) 644 goto encode_hdr; 645 646 if (*drc_status) { 647 status = *drc_status; 648 goto encode_hdr; 649 } 650 651 maxlen = xdr_out->end - xdr_out->p; 652 if (maxlen > 0 && maxlen < PAGE_SIZE) { 653 status = op->decode_args(rqstp, xdr_in, argp); 654 if (likely(status == 0)) 655 status = op->process_op(argp, resp); 656 } else 657 status = htonl(NFS4ERR_RESOURCE); 658 659 /* Only set by OP_CB_SEQUENCE processing */ 660 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 661 *drc_status = status; 662 status = 0; 663 } 664 665 encode_hdr: 666 res = encode_op_hdr(xdr_out, op_nr, status); 667 if (unlikely(res)) 668 return res; 669 if (op->encode_res != NULL && status == 0) 670 status = op->encode_res(rqstp, xdr_out, resp); 671 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 672 return status; 673 } 674 675 /* 676 * Decode, process and encode a COMPOUND 677 */ 678 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 679 { 680 struct cb_compound_hdr_arg hdr_arg = { 0 }; 681 struct cb_compound_hdr_res hdr_res = { NULL }; 682 struct xdr_stream xdr_in, xdr_out; 683 __be32 *p; 684 __be32 status, drc_status = 0; 685 unsigned int nops = 0; 686 687 dprintk("%s: start\n", __func__); 688 689 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 690 691 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 692 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 693 694 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 695 if (status == __constant_htonl(NFS4ERR_RESOURCE)) 696 return rpc_garbage_args; 697 698 hdr_res.taglen = hdr_arg.taglen; 699 hdr_res.tag = hdr_arg.tag; 700 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 701 return rpc_system_err; 702 703 while (status == 0 && nops != hdr_arg.nops) { 704 status = process_op(hdr_arg.minorversion, nops, rqstp, 705 &xdr_in, argp, &xdr_out, resp, &drc_status); 706 nops++; 707 } 708 709 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 710 * resource error in cb_compound status without returning op */ 711 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 712 status = htonl(NFS4ERR_RESOURCE); 713 nops--; 714 } 715 716 *hdr_res.status = status; 717 *hdr_res.nops = htonl(nops); 718 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 719 return rpc_success; 720 } 721 722 /* 723 * Define NFS4 callback COMPOUND ops. 724 */ 725 static struct callback_op callback_ops[] = { 726 [0] = { 727 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 728 }, 729 [OP_CB_GETATTR] = { 730 .process_op = (callback_process_op_t)nfs4_callback_getattr, 731 .decode_args = (callback_decode_arg_t)decode_getattr_args, 732 .encode_res = (callback_encode_res_t)encode_getattr_res, 733 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 734 }, 735 [OP_CB_RECALL] = { 736 .process_op = (callback_process_op_t)nfs4_callback_recall, 737 .decode_args = (callback_decode_arg_t)decode_recall_args, 738 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 739 }, 740 #if defined(CONFIG_NFS_V4_1) 741 [OP_CB_SEQUENCE] = { 742 .process_op = (callback_process_op_t)nfs4_callback_sequence, 743 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 744 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 745 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 746 }, 747 [OP_CB_RECALL_ANY] = { 748 .process_op = (callback_process_op_t)nfs4_callback_recallany, 749 .decode_args = (callback_decode_arg_t)decode_recallany_args, 750 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 751 }, 752 [OP_CB_RECALL_SLOT] = { 753 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 754 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 755 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 756 }, 757 #endif /* CONFIG_NFS_V4_1 */ 758 }; 759 760 /* 761 * Define NFS4 callback procedures 762 */ 763 static struct svc_procedure nfs4_callback_procedures1[] = { 764 [CB_NULL] = { 765 .pc_func = nfs4_callback_null, 766 .pc_decode = (kxdrproc_t)nfs4_decode_void, 767 .pc_encode = (kxdrproc_t)nfs4_encode_void, 768 .pc_xdrressize = 1, 769 }, 770 [CB_COMPOUND] = { 771 .pc_func = nfs4_callback_compound, 772 .pc_encode = (kxdrproc_t)nfs4_encode_void, 773 .pc_argsize = 256, 774 .pc_ressize = 256, 775 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 776 } 777 }; 778 779 struct svc_version nfs4_callback_version1 = { 780 .vs_vers = 1, 781 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 782 .vs_proc = nfs4_callback_procedures1, 783 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 784 .vs_dispatch = NULL, 785 }; 786 787 struct svc_version nfs4_callback_version4 = { 788 .vs_vers = 4, 789 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 790 .vs_proc = nfs4_callback_procedures1, 791 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 792 .vs_dispatch = NULL, 793 }; 794