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/ratelimit.h> 13 #include <linux/printk.h> 14 #include <linux/slab.h> 15 #include <linux/sunrpc/bc_xprt.h> 16 #include "nfs4_fs.h" 17 #include "callback.h" 18 #include "internal.h" 19 20 #define CB_OP_TAGLEN_MAXSZ (512) 21 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ) 22 #define CB_OP_GETATTR_BITMAP_MAXSZ (4) 23 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 24 CB_OP_GETATTR_BITMAP_MAXSZ + \ 25 2 + 2 + 3 + 3) 26 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 27 28 #if defined(CONFIG_NFS_V4_1) 29 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 30 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 31 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 32 4 + 1 + 3) 33 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 34 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 35 #endif /* CONFIG_NFS_V4_1 */ 36 37 #define NFSDBG_FACILITY NFSDBG_CALLBACK 38 39 /* Internal error code */ 40 #define NFS4ERR_RESOURCE_HDR 11050 41 42 typedef __be32 (*callback_process_op_t)(void *, void *, 43 struct cb_process_state *); 44 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 45 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 46 47 48 struct callback_op { 49 callback_process_op_t process_op; 50 callback_decode_arg_t decode_args; 51 callback_encode_res_t encode_res; 52 long res_maxsize; 53 }; 54 55 static struct callback_op callback_ops[]; 56 57 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 58 { 59 return htonl(NFS4_OK); 60 } 61 62 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 63 { 64 return xdr_argsize_check(rqstp, p); 65 } 66 67 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 68 { 69 return xdr_ressize_check(rqstp, p); 70 } 71 72 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) 73 { 74 __be32 *p; 75 76 p = xdr_inline_decode(xdr, nbytes); 77 if (unlikely(p == NULL)) 78 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n"); 79 return p; 80 } 81 82 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 83 { 84 __be32 *p; 85 86 p = read_buf(xdr, 4); 87 if (unlikely(p == NULL)) 88 return htonl(NFS4ERR_RESOURCE); 89 *len = ntohl(*p); 90 91 if (*len != 0) { 92 p = read_buf(xdr, *len); 93 if (unlikely(p == NULL)) 94 return htonl(NFS4ERR_RESOURCE); 95 *str = (const char *)p; 96 } else 97 *str = NULL; 98 99 return 0; 100 } 101 102 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 103 { 104 __be32 *p; 105 106 p = read_buf(xdr, 4); 107 if (unlikely(p == NULL)) 108 return htonl(NFS4ERR_RESOURCE); 109 fh->size = ntohl(*p); 110 if (fh->size > NFS4_FHSIZE) 111 return htonl(NFS4ERR_BADHANDLE); 112 p = read_buf(xdr, fh->size); 113 if (unlikely(p == NULL)) 114 return htonl(NFS4ERR_RESOURCE); 115 memcpy(&fh->data[0], p, fh->size); 116 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 117 return 0; 118 } 119 120 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 121 { 122 __be32 *p; 123 unsigned int attrlen; 124 125 p = read_buf(xdr, 4); 126 if (unlikely(p == NULL)) 127 return htonl(NFS4ERR_RESOURCE); 128 attrlen = ntohl(*p); 129 p = read_buf(xdr, attrlen << 2); 130 if (unlikely(p == NULL)) 131 return htonl(NFS4ERR_RESOURCE); 132 if (likely(attrlen > 0)) 133 bitmap[0] = ntohl(*p++); 134 if (attrlen > 1) 135 bitmap[1] = ntohl(*p); 136 return 0; 137 } 138 139 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 140 { 141 __be32 *p; 142 143 p = read_buf(xdr, NFS4_STATEID_SIZE); 144 if (unlikely(p == NULL)) 145 return htonl(NFS4ERR_RESOURCE); 146 memcpy(stateid, p, NFS4_STATEID_SIZE); 147 return 0; 148 } 149 150 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 151 { 152 __be32 *p; 153 __be32 status; 154 155 status = decode_string(xdr, &hdr->taglen, &hdr->tag); 156 if (unlikely(status != 0)) 157 return status; 158 /* We do not like overly long tags! */ 159 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { 160 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n", 161 __func__, hdr->taglen); 162 return htonl(NFS4ERR_RESOURCE); 163 } 164 p = read_buf(xdr, 12); 165 if (unlikely(p == NULL)) 166 return htonl(NFS4ERR_RESOURCE); 167 hdr->minorversion = ntohl(*p++); 168 /* Check minor version is zero or one. */ 169 if (hdr->minorversion <= 1) { 170 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */ 171 } else { 172 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with " 173 "illegal minor version %u!\n", 174 __func__, hdr->minorversion); 175 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 176 } 177 hdr->nops = ntohl(*p); 178 dprintk("%s: minorversion %d nops %d\n", __func__, 179 hdr->minorversion, hdr->nops); 180 return 0; 181 } 182 183 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 184 { 185 __be32 *p; 186 p = read_buf(xdr, 4); 187 if (unlikely(p == NULL)) 188 return htonl(NFS4ERR_RESOURCE_HDR); 189 *op = ntohl(*p); 190 return 0; 191 } 192 193 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 194 { 195 __be32 status; 196 197 status = decode_fh(xdr, &args->fh); 198 if (unlikely(status != 0)) 199 goto out; 200 args->addr = svc_addr(rqstp); 201 status = decode_bitmap(xdr, args->bitmap); 202 out: 203 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 204 return status; 205 } 206 207 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 208 { 209 __be32 *p; 210 __be32 status; 211 212 args->addr = svc_addr(rqstp); 213 status = decode_stateid(xdr, &args->stateid); 214 if (unlikely(status != 0)) 215 goto out; 216 p = read_buf(xdr, 4); 217 if (unlikely(p == NULL)) { 218 status = htonl(NFS4ERR_RESOURCE); 219 goto out; 220 } 221 args->truncate = ntohl(*p); 222 status = decode_fh(xdr, &args->fh); 223 out: 224 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 225 return status; 226 } 227 228 #if defined(CONFIG_NFS_V4_1) 229 230 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 231 struct xdr_stream *xdr, 232 struct cb_layoutrecallargs *args) 233 { 234 __be32 *p; 235 __be32 status = 0; 236 uint32_t iomode; 237 238 args->cbl_addr = svc_addr(rqstp); 239 p = read_buf(xdr, 4 * sizeof(uint32_t)); 240 if (unlikely(p == NULL)) { 241 status = htonl(NFS4ERR_BADXDR); 242 goto out; 243 } 244 245 args->cbl_layout_type = ntohl(*p++); 246 /* Depite the spec's xdr, iomode really belongs in the FILE switch, 247 * as it is unusable and ignored with the other types. 248 */ 249 iomode = ntohl(*p++); 250 args->cbl_layoutchanged = ntohl(*p++); 251 args->cbl_recall_type = ntohl(*p++); 252 253 if (args->cbl_recall_type == RETURN_FILE) { 254 args->cbl_range.iomode = iomode; 255 status = decode_fh(xdr, &args->cbl_fh); 256 if (unlikely(status != 0)) 257 goto out; 258 259 p = read_buf(xdr, 2 * sizeof(uint64_t)); 260 if (unlikely(p == NULL)) { 261 status = htonl(NFS4ERR_BADXDR); 262 goto out; 263 } 264 p = xdr_decode_hyper(p, &args->cbl_range.offset); 265 p = xdr_decode_hyper(p, &args->cbl_range.length); 266 status = decode_stateid(xdr, &args->cbl_stateid); 267 if (unlikely(status != 0)) 268 goto out; 269 } else if (args->cbl_recall_type == RETURN_FSID) { 270 p = read_buf(xdr, 2 * sizeof(uint64_t)); 271 if (unlikely(p == NULL)) { 272 status = htonl(NFS4ERR_BADXDR); 273 goto out; 274 } 275 p = xdr_decode_hyper(p, &args->cbl_fsid.major); 276 p = xdr_decode_hyper(p, &args->cbl_fsid.minor); 277 } else if (args->cbl_recall_type != RETURN_ALL) { 278 status = htonl(NFS4ERR_BADXDR); 279 goto out; 280 } 281 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n", 282 __func__, 283 args->cbl_layout_type, iomode, 284 args->cbl_layoutchanged, args->cbl_recall_type); 285 out: 286 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 287 return status; 288 } 289 290 static 291 __be32 decode_devicenotify_args(struct svc_rqst *rqstp, 292 struct xdr_stream *xdr, 293 struct cb_devicenotifyargs *args) 294 { 295 __be32 *p; 296 __be32 status = 0; 297 u32 tmp; 298 int n, i; 299 args->ndevs = 0; 300 301 /* Num of device notifications */ 302 p = read_buf(xdr, sizeof(uint32_t)); 303 if (unlikely(p == NULL)) { 304 status = htonl(NFS4ERR_BADXDR); 305 goto out; 306 } 307 n = ntohl(*p++); 308 if (n <= 0) 309 goto out; 310 if (n > ULONG_MAX / sizeof(*args->devs)) { 311 status = htonl(NFS4ERR_BADXDR); 312 goto out; 313 } 314 315 args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL); 316 if (!args->devs) { 317 status = htonl(NFS4ERR_DELAY); 318 goto out; 319 } 320 321 /* Decode each dev notification */ 322 for (i = 0; i < n; i++) { 323 struct cb_devicenotifyitem *dev = &args->devs[i]; 324 325 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE); 326 if (unlikely(p == NULL)) { 327 status = htonl(NFS4ERR_BADXDR); 328 goto err; 329 } 330 331 tmp = ntohl(*p++); /* bitmap size */ 332 if (tmp != 1) { 333 status = htonl(NFS4ERR_INVAL); 334 goto err; 335 } 336 dev->cbd_notify_type = ntohl(*p++); 337 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 338 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 339 status = htonl(NFS4ERR_INVAL); 340 goto err; 341 } 342 343 tmp = ntohl(*p++); /* opaque size */ 344 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 345 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 346 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 347 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 348 status = htonl(NFS4ERR_INVAL); 349 goto err; 350 } 351 dev->cbd_layout_type = ntohl(*p++); 352 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 353 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 354 355 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 356 p = read_buf(xdr, sizeof(uint32_t)); 357 if (unlikely(p == NULL)) { 358 status = htonl(NFS4ERR_BADXDR); 359 goto err; 360 } 361 dev->cbd_immediate = ntohl(*p++); 362 } else { 363 dev->cbd_immediate = 0; 364 } 365 366 args->ndevs++; 367 368 dprintk("%s: type %d layout 0x%x immediate %d\n", 369 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 370 dev->cbd_immediate); 371 } 372 out: 373 dprintk("%s: status %d ndevs %d\n", 374 __func__, ntohl(status), args->ndevs); 375 return status; 376 err: 377 kfree(args->devs); 378 goto out; 379 } 380 381 static __be32 decode_sessionid(struct xdr_stream *xdr, 382 struct nfs4_sessionid *sid) 383 { 384 __be32 *p; 385 int len = NFS4_MAX_SESSIONID_LEN; 386 387 p = read_buf(xdr, len); 388 if (unlikely(p == NULL)) 389 return htonl(NFS4ERR_RESOURCE); 390 391 memcpy(sid->data, p, len); 392 return 0; 393 } 394 395 static __be32 decode_rc_list(struct xdr_stream *xdr, 396 struct referring_call_list *rc_list) 397 { 398 __be32 *p; 399 int i; 400 __be32 status; 401 402 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 403 if (status) 404 goto out; 405 406 status = htonl(NFS4ERR_RESOURCE); 407 p = read_buf(xdr, sizeof(uint32_t)); 408 if (unlikely(p == NULL)) 409 goto out; 410 411 rc_list->rcl_nrefcalls = ntohl(*p++); 412 if (rc_list->rcl_nrefcalls) { 413 p = read_buf(xdr, 414 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 415 if (unlikely(p == NULL)) 416 goto out; 417 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * 418 sizeof(*rc_list->rcl_refcalls), 419 GFP_KERNEL); 420 if (unlikely(rc_list->rcl_refcalls == NULL)) 421 goto out; 422 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 423 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 424 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 425 } 426 } 427 status = 0; 428 429 out: 430 return status; 431 } 432 433 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 434 struct xdr_stream *xdr, 435 struct cb_sequenceargs *args) 436 { 437 __be32 *p; 438 int i; 439 __be32 status; 440 441 status = decode_sessionid(xdr, &args->csa_sessionid); 442 if (status) 443 goto out; 444 445 status = htonl(NFS4ERR_RESOURCE); 446 p = read_buf(xdr, 5 * sizeof(uint32_t)); 447 if (unlikely(p == NULL)) 448 goto out; 449 450 args->csa_addr = svc_addr(rqstp); 451 args->csa_sequenceid = ntohl(*p++); 452 args->csa_slotid = ntohl(*p++); 453 args->csa_highestslotid = ntohl(*p++); 454 args->csa_cachethis = ntohl(*p++); 455 args->csa_nrclists = ntohl(*p++); 456 args->csa_rclists = NULL; 457 if (args->csa_nrclists) { 458 args->csa_rclists = kmalloc_array(args->csa_nrclists, 459 sizeof(*args->csa_rclists), 460 GFP_KERNEL); 461 if (unlikely(args->csa_rclists == NULL)) 462 goto out; 463 464 for (i = 0; i < args->csa_nrclists; i++) { 465 status = decode_rc_list(xdr, &args->csa_rclists[i]); 466 if (status) 467 goto out_free; 468 } 469 } 470 status = 0; 471 472 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 473 "highestslotid %u cachethis %d nrclists %u\n", 474 __func__, 475 ((u32 *)&args->csa_sessionid)[0], 476 ((u32 *)&args->csa_sessionid)[1], 477 ((u32 *)&args->csa_sessionid)[2], 478 ((u32 *)&args->csa_sessionid)[3], 479 args->csa_sequenceid, args->csa_slotid, 480 args->csa_highestslotid, args->csa_cachethis, 481 args->csa_nrclists); 482 out: 483 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 484 return status; 485 486 out_free: 487 for (i = 0; i < args->csa_nrclists; i++) 488 kfree(args->csa_rclists[i].rcl_refcalls); 489 kfree(args->csa_rclists); 490 goto out; 491 } 492 493 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 494 struct xdr_stream *xdr, 495 struct cb_recallanyargs *args) 496 { 497 uint32_t bitmap[2]; 498 __be32 *p, status; 499 500 args->craa_addr = svc_addr(rqstp); 501 p = read_buf(xdr, 4); 502 if (unlikely(p == NULL)) 503 return htonl(NFS4ERR_BADXDR); 504 args->craa_objs_to_keep = ntohl(*p++); 505 status = decode_bitmap(xdr, bitmap); 506 if (unlikely(status)) 507 return status; 508 args->craa_type_mask = bitmap[0]; 509 510 return 0; 511 } 512 513 static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 514 struct xdr_stream *xdr, 515 struct cb_recallslotargs *args) 516 { 517 __be32 *p; 518 519 args->crsa_addr = svc_addr(rqstp); 520 p = read_buf(xdr, 4); 521 if (unlikely(p == NULL)) 522 return htonl(NFS4ERR_BADXDR); 523 args->crsa_target_max_slots = ntohl(*p++); 524 return 0; 525 } 526 527 #endif /* CONFIG_NFS_V4_1 */ 528 529 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 530 { 531 __be32 *p; 532 533 p = xdr_reserve_space(xdr, 4 + len); 534 if (unlikely(p == NULL)) 535 return htonl(NFS4ERR_RESOURCE); 536 xdr_encode_opaque(p, str, len); 537 return 0; 538 } 539 540 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 541 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 542 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 543 { 544 __be32 bm[2]; 545 __be32 *p; 546 547 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 548 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 549 if (bm[1] != 0) { 550 p = xdr_reserve_space(xdr, 16); 551 if (unlikely(p == NULL)) 552 return htonl(NFS4ERR_RESOURCE); 553 *p++ = htonl(2); 554 *p++ = bm[0]; 555 *p++ = bm[1]; 556 } else if (bm[0] != 0) { 557 p = xdr_reserve_space(xdr, 12); 558 if (unlikely(p == NULL)) 559 return htonl(NFS4ERR_RESOURCE); 560 *p++ = htonl(1); 561 *p++ = bm[0]; 562 } else { 563 p = xdr_reserve_space(xdr, 8); 564 if (unlikely(p == NULL)) 565 return htonl(NFS4ERR_RESOURCE); 566 *p++ = htonl(0); 567 } 568 *savep = p; 569 return 0; 570 } 571 572 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 573 { 574 __be32 *p; 575 576 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 577 return 0; 578 p = xdr_reserve_space(xdr, 8); 579 if (unlikely(!p)) 580 return htonl(NFS4ERR_RESOURCE); 581 p = xdr_encode_hyper(p, change); 582 return 0; 583 } 584 585 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 586 { 587 __be32 *p; 588 589 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 590 return 0; 591 p = xdr_reserve_space(xdr, 8); 592 if (unlikely(!p)) 593 return htonl(NFS4ERR_RESOURCE); 594 p = xdr_encode_hyper(p, size); 595 return 0; 596 } 597 598 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 599 { 600 __be32 *p; 601 602 p = xdr_reserve_space(xdr, 12); 603 if (unlikely(!p)) 604 return htonl(NFS4ERR_RESOURCE); 605 p = xdr_encode_hyper(p, time->tv_sec); 606 *p = htonl(time->tv_nsec); 607 return 0; 608 } 609 610 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 611 { 612 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 613 return 0; 614 return encode_attr_time(xdr,time); 615 } 616 617 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 618 { 619 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 620 return 0; 621 return encode_attr_time(xdr,time); 622 } 623 624 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 625 { 626 __be32 status; 627 628 hdr->status = xdr_reserve_space(xdr, 4); 629 if (unlikely(hdr->status == NULL)) 630 return htonl(NFS4ERR_RESOURCE); 631 status = encode_string(xdr, hdr->taglen, hdr->tag); 632 if (unlikely(status != 0)) 633 return status; 634 hdr->nops = xdr_reserve_space(xdr, 4); 635 if (unlikely(hdr->nops == NULL)) 636 return htonl(NFS4ERR_RESOURCE); 637 return 0; 638 } 639 640 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 641 { 642 __be32 *p; 643 644 p = xdr_reserve_space(xdr, 8); 645 if (unlikely(p == NULL)) 646 return htonl(NFS4ERR_RESOURCE_HDR); 647 *p++ = htonl(op); 648 *p = res; 649 return 0; 650 } 651 652 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 653 { 654 __be32 *savep = NULL; 655 __be32 status = res->status; 656 657 if (unlikely(status != 0)) 658 goto out; 659 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 660 if (unlikely(status != 0)) 661 goto out; 662 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 663 if (unlikely(status != 0)) 664 goto out; 665 status = encode_attr_size(xdr, res->bitmap, res->size); 666 if (unlikely(status != 0)) 667 goto out; 668 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 669 if (unlikely(status != 0)) 670 goto out; 671 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 672 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 673 out: 674 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 675 return status; 676 } 677 678 #if defined(CONFIG_NFS_V4_1) 679 680 static __be32 encode_sessionid(struct xdr_stream *xdr, 681 const struct nfs4_sessionid *sid) 682 { 683 __be32 *p; 684 int len = NFS4_MAX_SESSIONID_LEN; 685 686 p = xdr_reserve_space(xdr, len); 687 if (unlikely(p == NULL)) 688 return htonl(NFS4ERR_RESOURCE); 689 690 memcpy(p, sid, len); 691 return 0; 692 } 693 694 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 695 struct xdr_stream *xdr, 696 const struct cb_sequenceres *res) 697 { 698 __be32 *p; 699 __be32 status = res->csr_status; 700 701 if (unlikely(status != 0)) 702 goto out; 703 704 encode_sessionid(xdr, &res->csr_sessionid); 705 706 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 707 if (unlikely(p == NULL)) 708 return htonl(NFS4ERR_RESOURCE); 709 710 *p++ = htonl(res->csr_sequenceid); 711 *p++ = htonl(res->csr_slotid); 712 *p++ = htonl(res->csr_highestslotid); 713 *p++ = htonl(res->csr_target_highestslotid); 714 out: 715 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 716 return status; 717 } 718 719 static __be32 720 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 721 { 722 if (op_nr == OP_CB_SEQUENCE) { 723 if (nop != 0) 724 return htonl(NFS4ERR_SEQUENCE_POS); 725 } else { 726 if (nop == 0) 727 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 728 } 729 730 switch (op_nr) { 731 case OP_CB_GETATTR: 732 case OP_CB_RECALL: 733 case OP_CB_SEQUENCE: 734 case OP_CB_RECALL_ANY: 735 case OP_CB_RECALL_SLOT: 736 case OP_CB_LAYOUTRECALL: 737 case OP_CB_NOTIFY_DEVICEID: 738 *op = &callback_ops[op_nr]; 739 break; 740 741 case OP_CB_NOTIFY: 742 case OP_CB_PUSH_DELEG: 743 case OP_CB_RECALLABLE_OBJ_AVAIL: 744 case OP_CB_WANTS_CANCELLED: 745 case OP_CB_NOTIFY_LOCK: 746 return htonl(NFS4ERR_NOTSUPP); 747 748 default: 749 return htonl(NFS4ERR_OP_ILLEGAL); 750 } 751 752 return htonl(NFS_OK); 753 } 754 755 static void nfs4_callback_free_slot(struct nfs4_session *session) 756 { 757 struct nfs4_slot_table *tbl = &session->bc_slot_table; 758 759 spin_lock(&tbl->slot_tbl_lock); 760 /* 761 * Let the state manager know callback processing done. 762 * A single slot, so highest used slotid is either 0 or -1 763 */ 764 tbl->highest_used_slotid = NFS4_NO_SLOT; 765 nfs4_check_drain_bc_complete(session); 766 spin_unlock(&tbl->slot_tbl_lock); 767 } 768 769 static void nfs4_cb_free_slot(struct cb_process_state *cps) 770 { 771 if (cps->slotid != NFS4_NO_SLOT) 772 nfs4_callback_free_slot(cps->clp->cl_session); 773 } 774 775 #else /* CONFIG_NFS_V4_1 */ 776 777 static __be32 778 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 779 { 780 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 781 } 782 783 static void nfs4_cb_free_slot(struct cb_process_state *cps) 784 { 785 } 786 #endif /* CONFIG_NFS_V4_1 */ 787 788 static __be32 789 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 790 { 791 switch (op_nr) { 792 case OP_CB_GETATTR: 793 case OP_CB_RECALL: 794 *op = &callback_ops[op_nr]; 795 break; 796 default: 797 return htonl(NFS4ERR_OP_ILLEGAL); 798 } 799 800 return htonl(NFS_OK); 801 } 802 803 static __be32 process_op(uint32_t minorversion, int nop, 804 struct svc_rqst *rqstp, 805 struct xdr_stream *xdr_in, void *argp, 806 struct xdr_stream *xdr_out, void *resp, 807 struct cb_process_state *cps) 808 { 809 struct callback_op *op = &callback_ops[0]; 810 unsigned int op_nr; 811 __be32 status; 812 long maxlen; 813 __be32 res; 814 815 dprintk("%s: start\n", __func__); 816 status = decode_op_hdr(xdr_in, &op_nr); 817 if (unlikely(status)) 818 return status; 819 820 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 821 __func__, minorversion, nop, op_nr); 822 823 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : 824 preprocess_nfs4_op(op_nr, &op); 825 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 826 op_nr = OP_CB_ILLEGAL; 827 if (status) 828 goto encode_hdr; 829 830 if (cps->drc_status) { 831 status = cps->drc_status; 832 goto encode_hdr; 833 } 834 835 maxlen = xdr_out->end - xdr_out->p; 836 if (maxlen > 0 && maxlen < PAGE_SIZE) { 837 status = op->decode_args(rqstp, xdr_in, argp); 838 if (likely(status == 0)) 839 status = op->process_op(argp, resp, cps); 840 } else 841 status = htonl(NFS4ERR_RESOURCE); 842 843 encode_hdr: 844 res = encode_op_hdr(xdr_out, op_nr, status); 845 if (unlikely(res)) 846 return res; 847 if (op->encode_res != NULL && status == 0) 848 status = op->encode_res(rqstp, xdr_out, resp); 849 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 850 return status; 851 } 852 853 /* 854 * Decode, process and encode a COMPOUND 855 */ 856 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 857 { 858 struct cb_compound_hdr_arg hdr_arg = { 0 }; 859 struct cb_compound_hdr_res hdr_res = { NULL }; 860 struct xdr_stream xdr_in, xdr_out; 861 __be32 *p, status; 862 struct cb_process_state cps = { 863 .drc_status = 0, 864 .clp = NULL, 865 .slotid = NFS4_NO_SLOT, 866 .net = rqstp->rq_xprt->xpt_net, 867 }; 868 unsigned int nops = 0; 869 870 dprintk("%s: start\n", __func__); 871 872 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 873 874 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 875 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 876 877 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 878 if (status == __constant_htonl(NFS4ERR_RESOURCE)) 879 return rpc_garbage_args; 880 881 if (hdr_arg.minorversion == 0) { 882 cps.clp = nfs4_find_client_ident(rqstp->rq_xprt->xpt_net, hdr_arg.cb_ident); 883 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 884 return rpc_drop_reply; 885 } 886 887 hdr_res.taglen = hdr_arg.taglen; 888 hdr_res.tag = hdr_arg.tag; 889 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 890 return rpc_system_err; 891 892 while (status == 0 && nops != hdr_arg.nops) { 893 status = process_op(hdr_arg.minorversion, nops, rqstp, 894 &xdr_in, argp, &xdr_out, resp, &cps); 895 nops++; 896 } 897 898 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 899 * resource error in cb_compound status without returning op */ 900 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 901 status = htonl(NFS4ERR_RESOURCE); 902 nops--; 903 } 904 905 *hdr_res.status = status; 906 *hdr_res.nops = htonl(nops); 907 nfs4_cb_free_slot(&cps); 908 nfs_put_client(cps.clp); 909 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 910 return rpc_success; 911 } 912 913 /* 914 * Define NFS4 callback COMPOUND ops. 915 */ 916 static struct callback_op callback_ops[] = { 917 [0] = { 918 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 919 }, 920 [OP_CB_GETATTR] = { 921 .process_op = (callback_process_op_t)nfs4_callback_getattr, 922 .decode_args = (callback_decode_arg_t)decode_getattr_args, 923 .encode_res = (callback_encode_res_t)encode_getattr_res, 924 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 925 }, 926 [OP_CB_RECALL] = { 927 .process_op = (callback_process_op_t)nfs4_callback_recall, 928 .decode_args = (callback_decode_arg_t)decode_recall_args, 929 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 930 }, 931 #if defined(CONFIG_NFS_V4_1) 932 [OP_CB_LAYOUTRECALL] = { 933 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall, 934 .decode_args = 935 (callback_decode_arg_t)decode_layoutrecall_args, 936 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 937 }, 938 [OP_CB_NOTIFY_DEVICEID] = { 939 .process_op = (callback_process_op_t)nfs4_callback_devicenotify, 940 .decode_args = 941 (callback_decode_arg_t)decode_devicenotify_args, 942 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 943 }, 944 [OP_CB_SEQUENCE] = { 945 .process_op = (callback_process_op_t)nfs4_callback_sequence, 946 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 947 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 948 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 949 }, 950 [OP_CB_RECALL_ANY] = { 951 .process_op = (callback_process_op_t)nfs4_callback_recallany, 952 .decode_args = (callback_decode_arg_t)decode_recallany_args, 953 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 954 }, 955 [OP_CB_RECALL_SLOT] = { 956 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 957 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 958 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 959 }, 960 #endif /* CONFIG_NFS_V4_1 */ 961 }; 962 963 /* 964 * Define NFS4 callback procedures 965 */ 966 static struct svc_procedure nfs4_callback_procedures1[] = { 967 [CB_NULL] = { 968 .pc_func = nfs4_callback_null, 969 .pc_decode = (kxdrproc_t)nfs4_decode_void, 970 .pc_encode = (kxdrproc_t)nfs4_encode_void, 971 .pc_xdrressize = 1, 972 }, 973 [CB_COMPOUND] = { 974 .pc_func = nfs4_callback_compound, 975 .pc_encode = (kxdrproc_t)nfs4_encode_void, 976 .pc_argsize = 256, 977 .pc_ressize = 256, 978 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 979 } 980 }; 981 982 struct svc_version nfs4_callback_version1 = { 983 .vs_vers = 1, 984 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 985 .vs_proc = nfs4_callback_procedures1, 986 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 987 .vs_dispatch = NULL, 988 .vs_hidden = 1, 989 }; 990 991 struct svc_version nfs4_callback_version4 = { 992 .vs_vers = 4, 993 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 994 .vs_proc = nfs4_callback_procedures1, 995 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 996 .vs_dispatch = NULL, 997 .vs_hidden = 1, 998 }; 999