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 __be32 *p; 492 493 args->craa_addr = svc_addr(rqstp); 494 p = read_buf(xdr, 4); 495 if (unlikely(p == NULL)) 496 return htonl(NFS4ERR_BADXDR); 497 args->craa_objs_to_keep = ntohl(*p++); 498 p = read_buf(xdr, 4); 499 if (unlikely(p == NULL)) 500 return htonl(NFS4ERR_BADXDR); 501 args->craa_type_mask = ntohl(*p); 502 503 return 0; 504 } 505 506 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 507 struct xdr_stream *xdr, 508 struct cb_recallslotargs *args) 509 { 510 __be32 *p; 511 512 args->crsa_addr = svc_addr(rqstp); 513 p = read_buf(xdr, 4); 514 if (unlikely(p == NULL)) 515 return htonl(NFS4ERR_BADXDR); 516 args->crsa_target_max_slots = ntohl(*p++); 517 return 0; 518 } 519 520 #endif /* CONFIG_NFS_V4_1 */ 521 522 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 523 { 524 __be32 *p; 525 526 p = xdr_reserve_space(xdr, 4 + len); 527 if (unlikely(p == NULL)) 528 return htonl(NFS4ERR_RESOURCE); 529 xdr_encode_opaque(p, str, len); 530 return 0; 531 } 532 533 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 534 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 535 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 536 { 537 __be32 bm[2]; 538 __be32 *p; 539 540 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 541 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 542 if (bm[1] != 0) { 543 p = xdr_reserve_space(xdr, 16); 544 if (unlikely(p == NULL)) 545 return htonl(NFS4ERR_RESOURCE); 546 *p++ = htonl(2); 547 *p++ = bm[0]; 548 *p++ = bm[1]; 549 } else if (bm[0] != 0) { 550 p = xdr_reserve_space(xdr, 12); 551 if (unlikely(p == NULL)) 552 return htonl(NFS4ERR_RESOURCE); 553 *p++ = htonl(1); 554 *p++ = bm[0]; 555 } else { 556 p = xdr_reserve_space(xdr, 8); 557 if (unlikely(p == NULL)) 558 return htonl(NFS4ERR_RESOURCE); 559 *p++ = htonl(0); 560 } 561 *savep = p; 562 return 0; 563 } 564 565 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 566 { 567 __be32 *p; 568 569 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 570 return 0; 571 p = xdr_reserve_space(xdr, 8); 572 if (unlikely(!p)) 573 return htonl(NFS4ERR_RESOURCE); 574 p = xdr_encode_hyper(p, change); 575 return 0; 576 } 577 578 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 579 { 580 __be32 *p; 581 582 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 583 return 0; 584 p = xdr_reserve_space(xdr, 8); 585 if (unlikely(!p)) 586 return htonl(NFS4ERR_RESOURCE); 587 p = xdr_encode_hyper(p, size); 588 return 0; 589 } 590 591 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 592 { 593 __be32 *p; 594 595 p = xdr_reserve_space(xdr, 12); 596 if (unlikely(!p)) 597 return htonl(NFS4ERR_RESOURCE); 598 p = xdr_encode_hyper(p, time->tv_sec); 599 *p = htonl(time->tv_nsec); 600 return 0; 601 } 602 603 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 604 { 605 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 606 return 0; 607 return encode_attr_time(xdr,time); 608 } 609 610 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 611 { 612 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 613 return 0; 614 return encode_attr_time(xdr,time); 615 } 616 617 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 618 { 619 __be32 status; 620 621 hdr->status = xdr_reserve_space(xdr, 4); 622 if (unlikely(hdr->status == NULL)) 623 return htonl(NFS4ERR_RESOURCE); 624 status = encode_string(xdr, hdr->taglen, hdr->tag); 625 if (unlikely(status != 0)) 626 return status; 627 hdr->nops = xdr_reserve_space(xdr, 4); 628 if (unlikely(hdr->nops == NULL)) 629 return htonl(NFS4ERR_RESOURCE); 630 return 0; 631 } 632 633 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 634 { 635 __be32 *p; 636 637 p = xdr_reserve_space(xdr, 8); 638 if (unlikely(p == NULL)) 639 return htonl(NFS4ERR_RESOURCE_HDR); 640 *p++ = htonl(op); 641 *p = res; 642 return 0; 643 } 644 645 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 646 { 647 __be32 *savep = NULL; 648 __be32 status = res->status; 649 650 if (unlikely(status != 0)) 651 goto out; 652 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 653 if (unlikely(status != 0)) 654 goto out; 655 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 656 if (unlikely(status != 0)) 657 goto out; 658 status = encode_attr_size(xdr, res->bitmap, res->size); 659 if (unlikely(status != 0)) 660 goto out; 661 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 662 if (unlikely(status != 0)) 663 goto out; 664 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 665 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 666 out: 667 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 668 return status; 669 } 670 671 #if defined(CONFIG_NFS_V4_1) 672 673 static __be32 encode_sessionid(struct xdr_stream *xdr, 674 const struct nfs4_sessionid *sid) 675 { 676 __be32 *p; 677 int len = NFS4_MAX_SESSIONID_LEN; 678 679 p = xdr_reserve_space(xdr, len); 680 if (unlikely(p == NULL)) 681 return htonl(NFS4ERR_RESOURCE); 682 683 memcpy(p, sid, len); 684 return 0; 685 } 686 687 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 688 struct xdr_stream *xdr, 689 const struct cb_sequenceres *res) 690 { 691 __be32 *p; 692 unsigned status = res->csr_status; 693 694 if (unlikely(status != 0)) 695 goto out; 696 697 encode_sessionid(xdr, &res->csr_sessionid); 698 699 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 700 if (unlikely(p == NULL)) 701 return htonl(NFS4ERR_RESOURCE); 702 703 *p++ = htonl(res->csr_sequenceid); 704 *p++ = htonl(res->csr_slotid); 705 *p++ = htonl(res->csr_highestslotid); 706 *p++ = htonl(res->csr_target_highestslotid); 707 out: 708 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 709 return status; 710 } 711 712 static __be32 713 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 714 { 715 if (op_nr == OP_CB_SEQUENCE) { 716 if (nop != 0) 717 return htonl(NFS4ERR_SEQUENCE_POS); 718 } else { 719 if (nop == 0) 720 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 721 } 722 723 switch (op_nr) { 724 case OP_CB_GETATTR: 725 case OP_CB_RECALL: 726 case OP_CB_SEQUENCE: 727 case OP_CB_RECALL_ANY: 728 case OP_CB_RECALL_SLOT: 729 case OP_CB_LAYOUTRECALL: 730 case OP_CB_NOTIFY_DEVICEID: 731 *op = &callback_ops[op_nr]; 732 break; 733 734 case OP_CB_NOTIFY: 735 case OP_CB_PUSH_DELEG: 736 case OP_CB_RECALLABLE_OBJ_AVAIL: 737 case OP_CB_WANTS_CANCELLED: 738 case OP_CB_NOTIFY_LOCK: 739 return htonl(NFS4ERR_NOTSUPP); 740 741 default: 742 return htonl(NFS4ERR_OP_ILLEGAL); 743 } 744 745 return htonl(NFS_OK); 746 } 747 748 static void nfs4_callback_free_slot(struct nfs4_session *session) 749 { 750 struct nfs4_slot_table *tbl = &session->bc_slot_table; 751 752 spin_lock(&tbl->slot_tbl_lock); 753 /* 754 * Let the state manager know callback processing done. 755 * A single slot, so highest used slotid is either 0 or -1 756 */ 757 tbl->highest_used_slotid = -1; 758 nfs4_check_drain_bc_complete(session); 759 spin_unlock(&tbl->slot_tbl_lock); 760 } 761 762 static void nfs4_cb_free_slot(struct cb_process_state *cps) 763 { 764 if (cps->slotid != -1) 765 nfs4_callback_free_slot(cps->clp->cl_session); 766 } 767 768 #else /* CONFIG_NFS_V4_1 */ 769 770 static __be32 771 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 772 { 773 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 774 } 775 776 static void nfs4_cb_free_slot(struct cb_process_state *cps) 777 { 778 } 779 #endif /* CONFIG_NFS_V4_1 */ 780 781 static __be32 782 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 783 { 784 switch (op_nr) { 785 case OP_CB_GETATTR: 786 case OP_CB_RECALL: 787 *op = &callback_ops[op_nr]; 788 break; 789 default: 790 return htonl(NFS4ERR_OP_ILLEGAL); 791 } 792 793 return htonl(NFS_OK); 794 } 795 796 static __be32 process_op(uint32_t minorversion, int nop, 797 struct svc_rqst *rqstp, 798 struct xdr_stream *xdr_in, void *argp, 799 struct xdr_stream *xdr_out, void *resp, 800 struct cb_process_state *cps) 801 { 802 struct callback_op *op = &callback_ops[0]; 803 unsigned int op_nr; 804 __be32 status; 805 long maxlen; 806 __be32 res; 807 808 dprintk("%s: start\n", __func__); 809 status = decode_op_hdr(xdr_in, &op_nr); 810 if (unlikely(status)) 811 return status; 812 813 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 814 __func__, minorversion, nop, op_nr); 815 816 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : 817 preprocess_nfs4_op(op_nr, &op); 818 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 819 op_nr = OP_CB_ILLEGAL; 820 if (status) 821 goto encode_hdr; 822 823 if (cps->drc_status) { 824 status = cps->drc_status; 825 goto encode_hdr; 826 } 827 828 maxlen = xdr_out->end - xdr_out->p; 829 if (maxlen > 0 && maxlen < PAGE_SIZE) { 830 status = op->decode_args(rqstp, xdr_in, argp); 831 if (likely(status == 0)) 832 status = op->process_op(argp, resp, cps); 833 } else 834 status = htonl(NFS4ERR_RESOURCE); 835 836 encode_hdr: 837 res = encode_op_hdr(xdr_out, op_nr, status); 838 if (unlikely(res)) 839 return res; 840 if (op->encode_res != NULL && status == 0) 841 status = op->encode_res(rqstp, xdr_out, resp); 842 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 843 return status; 844 } 845 846 /* 847 * Decode, process and encode a COMPOUND 848 */ 849 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 850 { 851 struct cb_compound_hdr_arg hdr_arg = { 0 }; 852 struct cb_compound_hdr_res hdr_res = { NULL }; 853 struct xdr_stream xdr_in, xdr_out; 854 __be32 *p, status; 855 struct cb_process_state cps = { 856 .drc_status = 0, 857 .clp = NULL, 858 .slotid = -1, 859 }; 860 unsigned int nops = 0; 861 862 dprintk("%s: start\n", __func__); 863 864 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 865 866 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 867 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 868 869 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 870 if (status == __constant_htonl(NFS4ERR_RESOURCE)) 871 return rpc_garbage_args; 872 873 if (hdr_arg.minorversion == 0) { 874 cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident); 875 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 876 return rpc_drop_reply; 877 } 878 879 hdr_res.taglen = hdr_arg.taglen; 880 hdr_res.tag = hdr_arg.tag; 881 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 882 return rpc_system_err; 883 884 while (status == 0 && nops != hdr_arg.nops) { 885 status = process_op(hdr_arg.minorversion, nops, rqstp, 886 &xdr_in, argp, &xdr_out, resp, &cps); 887 nops++; 888 } 889 890 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 891 * resource error in cb_compound status without returning op */ 892 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 893 status = htonl(NFS4ERR_RESOURCE); 894 nops--; 895 } 896 897 *hdr_res.status = status; 898 *hdr_res.nops = htonl(nops); 899 nfs4_cb_free_slot(&cps); 900 nfs_put_client(cps.clp); 901 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 902 return rpc_success; 903 } 904 905 /* 906 * Define NFS4 callback COMPOUND ops. 907 */ 908 static struct callback_op callback_ops[] = { 909 [0] = { 910 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 911 }, 912 [OP_CB_GETATTR] = { 913 .process_op = (callback_process_op_t)nfs4_callback_getattr, 914 .decode_args = (callback_decode_arg_t)decode_getattr_args, 915 .encode_res = (callback_encode_res_t)encode_getattr_res, 916 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 917 }, 918 [OP_CB_RECALL] = { 919 .process_op = (callback_process_op_t)nfs4_callback_recall, 920 .decode_args = (callback_decode_arg_t)decode_recall_args, 921 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 922 }, 923 #if defined(CONFIG_NFS_V4_1) 924 [OP_CB_LAYOUTRECALL] = { 925 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall, 926 .decode_args = 927 (callback_decode_arg_t)decode_layoutrecall_args, 928 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 929 }, 930 [OP_CB_NOTIFY_DEVICEID] = { 931 .process_op = (callback_process_op_t)nfs4_callback_devicenotify, 932 .decode_args = 933 (callback_decode_arg_t)decode_devicenotify_args, 934 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 935 }, 936 [OP_CB_SEQUENCE] = { 937 .process_op = (callback_process_op_t)nfs4_callback_sequence, 938 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 939 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 940 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 941 }, 942 [OP_CB_RECALL_ANY] = { 943 .process_op = (callback_process_op_t)nfs4_callback_recallany, 944 .decode_args = (callback_decode_arg_t)decode_recallany_args, 945 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 946 }, 947 [OP_CB_RECALL_SLOT] = { 948 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 949 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 950 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 951 }, 952 #endif /* CONFIG_NFS_V4_1 */ 953 }; 954 955 /* 956 * Define NFS4 callback procedures 957 */ 958 static struct svc_procedure nfs4_callback_procedures1[] = { 959 [CB_NULL] = { 960 .pc_func = nfs4_callback_null, 961 .pc_decode = (kxdrproc_t)nfs4_decode_void, 962 .pc_encode = (kxdrproc_t)nfs4_encode_void, 963 .pc_xdrressize = 1, 964 }, 965 [CB_COMPOUND] = { 966 .pc_func = nfs4_callback_compound, 967 .pc_encode = (kxdrproc_t)nfs4_encode_void, 968 .pc_argsize = 256, 969 .pc_ressize = 256, 970 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 971 } 972 }; 973 974 struct svc_version nfs4_callback_version1 = { 975 .vs_vers = 1, 976 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 977 .vs_proc = nfs4_callback_procedures1, 978 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 979 .vs_dispatch = NULL, 980 .vs_hidden = 1, 981 }; 982 983 struct svc_version nfs4_callback_version4 = { 984 .vs_vers = 4, 985 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 986 .vs_proc = nfs4_callback_procedures1, 987 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 988 .vs_dispatch = NULL, 989 }; 990