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 #include "nfs4session.h" 20 21 #define CB_OP_TAGLEN_MAXSZ (512) 22 #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status 23 #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps 24 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 25 CB_OP_GETATTR_BITMAP_MAXSZ + \ 26 /* change, size, ctime, mtime */\ 27 (2 + 2 + 3 + 3) * 4) 28 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 29 30 #if defined(CONFIG_NFS_V4_1) 31 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 32 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 33 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 34 NFS4_MAX_SESSIONID_LEN + \ 35 (1 + 3) * 4) // seqid, 3 slotids 36 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 37 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 38 #endif /* CONFIG_NFS_V4_1 */ 39 40 #define NFSDBG_FACILITY NFSDBG_CALLBACK 41 42 /* Internal error code */ 43 #define NFS4ERR_RESOURCE_HDR 11050 44 45 typedef __be32 (*callback_process_op_t)(void *, void *, 46 struct cb_process_state *); 47 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 48 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 49 50 51 struct callback_op { 52 callback_process_op_t process_op; 53 callback_decode_arg_t decode_args; 54 callback_encode_res_t encode_res; 55 long res_maxsize; 56 }; 57 58 static struct callback_op callback_ops[]; 59 60 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 61 { 62 return htonl(NFS4_OK); 63 } 64 65 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 66 { 67 return xdr_argsize_check(rqstp, p); 68 } 69 70 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 71 { 72 return xdr_ressize_check(rqstp, p); 73 } 74 75 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) 76 { 77 __be32 *p; 78 79 p = xdr_inline_decode(xdr, nbytes); 80 if (unlikely(p == NULL)) 81 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n"); 82 return p; 83 } 84 85 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 86 { 87 __be32 *p; 88 89 p = read_buf(xdr, 4); 90 if (unlikely(p == NULL)) 91 return htonl(NFS4ERR_RESOURCE); 92 *len = ntohl(*p); 93 94 if (*len != 0) { 95 p = read_buf(xdr, *len); 96 if (unlikely(p == NULL)) 97 return htonl(NFS4ERR_RESOURCE); 98 *str = (const char *)p; 99 } else 100 *str = NULL; 101 102 return 0; 103 } 104 105 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 106 { 107 __be32 *p; 108 109 p = read_buf(xdr, 4); 110 if (unlikely(p == NULL)) 111 return htonl(NFS4ERR_RESOURCE); 112 fh->size = ntohl(*p); 113 if (fh->size > NFS4_FHSIZE) 114 return htonl(NFS4ERR_BADHANDLE); 115 p = read_buf(xdr, fh->size); 116 if (unlikely(p == NULL)) 117 return htonl(NFS4ERR_RESOURCE); 118 memcpy(&fh->data[0], p, fh->size); 119 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 120 return 0; 121 } 122 123 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 124 { 125 __be32 *p; 126 unsigned int attrlen; 127 128 p = read_buf(xdr, 4); 129 if (unlikely(p == NULL)) 130 return htonl(NFS4ERR_RESOURCE); 131 attrlen = ntohl(*p); 132 p = read_buf(xdr, attrlen << 2); 133 if (unlikely(p == NULL)) 134 return htonl(NFS4ERR_RESOURCE); 135 if (likely(attrlen > 0)) 136 bitmap[0] = ntohl(*p++); 137 if (attrlen > 1) 138 bitmap[1] = ntohl(*p); 139 return 0; 140 } 141 142 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 143 { 144 __be32 *p; 145 146 p = read_buf(xdr, NFS4_STATEID_SIZE); 147 if (unlikely(p == NULL)) 148 return htonl(NFS4ERR_RESOURCE); 149 memcpy(stateid, p, NFS4_STATEID_SIZE); 150 return 0; 151 } 152 153 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 154 { 155 __be32 *p; 156 __be32 status; 157 158 status = decode_string(xdr, &hdr->taglen, &hdr->tag); 159 if (unlikely(status != 0)) 160 return status; 161 /* We do not like overly long tags! */ 162 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ) { 163 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n", 164 __func__, hdr->taglen); 165 return htonl(NFS4ERR_RESOURCE); 166 } 167 p = read_buf(xdr, 12); 168 if (unlikely(p == NULL)) 169 return htonl(NFS4ERR_RESOURCE); 170 hdr->minorversion = ntohl(*p++); 171 /* Check for minor version support */ 172 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) { 173 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */ 174 } else { 175 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with " 176 "illegal minor version %u!\n", 177 __func__, hdr->minorversion); 178 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 179 } 180 hdr->nops = ntohl(*p); 181 dprintk("%s: minorversion %d nops %d\n", __func__, 182 hdr->minorversion, hdr->nops); 183 return 0; 184 } 185 186 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 187 { 188 __be32 *p; 189 p = read_buf(xdr, 4); 190 if (unlikely(p == NULL)) 191 return htonl(NFS4ERR_RESOURCE_HDR); 192 *op = ntohl(*p); 193 return 0; 194 } 195 196 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 197 { 198 __be32 status; 199 200 status = decode_fh(xdr, &args->fh); 201 if (unlikely(status != 0)) 202 goto out; 203 status = decode_bitmap(xdr, args->bitmap); 204 out: 205 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 206 return status; 207 } 208 209 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 210 { 211 __be32 *p; 212 __be32 status; 213 214 status = decode_stateid(xdr, &args->stateid); 215 if (unlikely(status != 0)) 216 goto out; 217 p = read_buf(xdr, 4); 218 if (unlikely(p == NULL)) { 219 status = htonl(NFS4ERR_RESOURCE); 220 goto out; 221 } 222 args->truncate = ntohl(*p); 223 status = decode_fh(xdr, &args->fh); 224 out: 225 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 226 return status; 227 } 228 229 #if defined(CONFIG_NFS_V4_1) 230 231 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, 232 struct xdr_stream *xdr, 233 struct cb_layoutrecallargs *args) 234 { 235 __be32 *p; 236 __be32 status = 0; 237 uint32_t iomode; 238 239 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_array(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; 385 386 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN); 387 if (unlikely(p == NULL)) 388 return htonl(NFS4ERR_RESOURCE); 389 390 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN); 391 return 0; 392 } 393 394 static __be32 decode_rc_list(struct xdr_stream *xdr, 395 struct referring_call_list *rc_list) 396 { 397 __be32 *p; 398 int i; 399 __be32 status; 400 401 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 402 if (status) 403 goto out; 404 405 status = htonl(NFS4ERR_RESOURCE); 406 p = read_buf(xdr, sizeof(uint32_t)); 407 if (unlikely(p == NULL)) 408 goto out; 409 410 rc_list->rcl_nrefcalls = ntohl(*p++); 411 if (rc_list->rcl_nrefcalls) { 412 p = read_buf(xdr, 413 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 414 if (unlikely(p == NULL)) 415 goto out; 416 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls, 417 sizeof(*rc_list->rcl_refcalls), 418 GFP_KERNEL); 419 if (unlikely(rc_list->rcl_refcalls == NULL)) 420 goto out; 421 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 422 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 423 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 424 } 425 } 426 status = 0; 427 428 out: 429 return status; 430 } 431 432 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 433 struct xdr_stream *xdr, 434 struct cb_sequenceargs *args) 435 { 436 __be32 *p; 437 int i; 438 __be32 status; 439 440 status = decode_sessionid(xdr, &args->csa_sessionid); 441 if (status) 442 goto out; 443 444 status = htonl(NFS4ERR_RESOURCE); 445 p = read_buf(xdr, 5 * sizeof(uint32_t)); 446 if (unlikely(p == NULL)) 447 goto out; 448 449 args->csa_addr = svc_addr(rqstp); 450 args->csa_sequenceid = ntohl(*p++); 451 args->csa_slotid = ntohl(*p++); 452 args->csa_highestslotid = ntohl(*p++); 453 args->csa_cachethis = ntohl(*p++); 454 args->csa_nrclists = ntohl(*p++); 455 args->csa_rclists = NULL; 456 if (args->csa_nrclists) { 457 args->csa_rclists = kmalloc_array(args->csa_nrclists, 458 sizeof(*args->csa_rclists), 459 GFP_KERNEL); 460 if (unlikely(args->csa_rclists == NULL)) 461 goto out; 462 463 for (i = 0; i < args->csa_nrclists; i++) { 464 status = decode_rc_list(xdr, &args->csa_rclists[i]); 465 if (status) { 466 args->csa_nrclists = i; 467 goto out_free; 468 } 469 } 470 } 471 status = 0; 472 473 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 474 "highestslotid %u cachethis %d nrclists %u\n", 475 __func__, 476 ((u32 *)&args->csa_sessionid)[0], 477 ((u32 *)&args->csa_sessionid)[1], 478 ((u32 *)&args->csa_sessionid)[2], 479 ((u32 *)&args->csa_sessionid)[3], 480 args->csa_sequenceid, args->csa_slotid, 481 args->csa_highestslotid, args->csa_cachethis, 482 args->csa_nrclists); 483 out: 484 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 485 return status; 486 487 out_free: 488 for (i = 0; i < args->csa_nrclists; i++) 489 kfree(args->csa_rclists[i].rcl_refcalls); 490 kfree(args->csa_rclists); 491 goto out; 492 } 493 494 static __be32 decode_recallany_args(struct svc_rqst *rqstp, 495 struct xdr_stream *xdr, 496 struct cb_recallanyargs *args) 497 { 498 uint32_t bitmap[2]; 499 __be32 *p, status; 500 501 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 p = read_buf(xdr, 4); 520 if (unlikely(p == NULL)) 521 return htonl(NFS4ERR_BADXDR); 522 args->crsa_target_highest_slotid = ntohl(*p++); 523 return 0; 524 } 525 526 #endif /* CONFIG_NFS_V4_1 */ 527 528 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 529 { 530 __be32 *p; 531 532 p = xdr_reserve_space(xdr, 4 + len); 533 if (unlikely(p == NULL)) 534 return htonl(NFS4ERR_RESOURCE); 535 xdr_encode_opaque(p, str, len); 536 return 0; 537 } 538 539 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 540 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 541 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 542 { 543 __be32 bm[2]; 544 __be32 *p; 545 546 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 547 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 548 if (bm[1] != 0) { 549 p = xdr_reserve_space(xdr, 16); 550 if (unlikely(p == NULL)) 551 return htonl(NFS4ERR_RESOURCE); 552 *p++ = htonl(2); 553 *p++ = bm[0]; 554 *p++ = bm[1]; 555 } else if (bm[0] != 0) { 556 p = xdr_reserve_space(xdr, 12); 557 if (unlikely(p == NULL)) 558 return htonl(NFS4ERR_RESOURCE); 559 *p++ = htonl(1); 560 *p++ = bm[0]; 561 } else { 562 p = xdr_reserve_space(xdr, 8); 563 if (unlikely(p == NULL)) 564 return htonl(NFS4ERR_RESOURCE); 565 *p++ = htonl(0); 566 } 567 *savep = p; 568 return 0; 569 } 570 571 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 572 { 573 __be32 *p; 574 575 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 576 return 0; 577 p = xdr_reserve_space(xdr, 8); 578 if (unlikely(!p)) 579 return htonl(NFS4ERR_RESOURCE); 580 p = xdr_encode_hyper(p, change); 581 return 0; 582 } 583 584 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 585 { 586 __be32 *p; 587 588 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 589 return 0; 590 p = xdr_reserve_space(xdr, 8); 591 if (unlikely(!p)) 592 return htonl(NFS4ERR_RESOURCE); 593 p = xdr_encode_hyper(p, size); 594 return 0; 595 } 596 597 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 598 { 599 __be32 *p; 600 601 p = xdr_reserve_space(xdr, 12); 602 if (unlikely(!p)) 603 return htonl(NFS4ERR_RESOURCE); 604 p = xdr_encode_hyper(p, time->tv_sec); 605 *p = htonl(time->tv_nsec); 606 return 0; 607 } 608 609 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 610 { 611 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 612 return 0; 613 return encode_attr_time(xdr,time); 614 } 615 616 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 617 { 618 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 619 return 0; 620 return encode_attr_time(xdr,time); 621 } 622 623 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 624 { 625 __be32 status; 626 627 hdr->status = xdr_reserve_space(xdr, 4); 628 if (unlikely(hdr->status == NULL)) 629 return htonl(NFS4ERR_RESOURCE); 630 status = encode_string(xdr, hdr->taglen, hdr->tag); 631 if (unlikely(status != 0)) 632 return status; 633 hdr->nops = xdr_reserve_space(xdr, 4); 634 if (unlikely(hdr->nops == NULL)) 635 return htonl(NFS4ERR_RESOURCE); 636 return 0; 637 } 638 639 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 640 { 641 __be32 *p; 642 643 p = xdr_reserve_space(xdr, 8); 644 if (unlikely(p == NULL)) 645 return htonl(NFS4ERR_RESOURCE_HDR); 646 *p++ = htonl(op); 647 *p = res; 648 return 0; 649 } 650 651 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 652 { 653 __be32 *savep = NULL; 654 __be32 status = res->status; 655 656 if (unlikely(status != 0)) 657 goto out; 658 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 659 if (unlikely(status != 0)) 660 goto out; 661 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 662 if (unlikely(status != 0)) 663 goto out; 664 status = encode_attr_size(xdr, res->bitmap, res->size); 665 if (unlikely(status != 0)) 666 goto out; 667 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 668 if (unlikely(status != 0)) 669 goto out; 670 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 671 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 672 out: 673 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 674 return status; 675 } 676 677 #if defined(CONFIG_NFS_V4_1) 678 679 static __be32 encode_sessionid(struct xdr_stream *xdr, 680 const struct nfs4_sessionid *sid) 681 { 682 __be32 *p; 683 684 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 685 if (unlikely(p == NULL)) 686 return htonl(NFS4ERR_RESOURCE); 687 688 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN); 689 return 0; 690 } 691 692 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 693 struct xdr_stream *xdr, 694 const struct cb_sequenceres *res) 695 { 696 __be32 *p; 697 __be32 status = res->csr_status; 698 699 if (unlikely(status != 0)) 700 goto out; 701 702 status = encode_sessionid(xdr, &res->csr_sessionid); 703 if (status) 704 goto out; 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_slot_tbl_drain_complete(tbl); 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 #ifdef CONFIG_NFS_V4_2 789 static __be32 790 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 791 { 792 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 793 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 794 return status; 795 796 if (op_nr == OP_CB_OFFLOAD) 797 return htonl(NFS4ERR_NOTSUPP); 798 return htonl(NFS4ERR_OP_ILLEGAL); 799 } 800 #else /* CONFIG_NFS_V4_2 */ 801 static __be32 802 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 803 { 804 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 805 } 806 #endif /* CONFIG_NFS_V4_2 */ 807 808 static __be32 809 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 810 { 811 switch (op_nr) { 812 case OP_CB_GETATTR: 813 case OP_CB_RECALL: 814 *op = &callback_ops[op_nr]; 815 break; 816 default: 817 return htonl(NFS4ERR_OP_ILLEGAL); 818 } 819 820 return htonl(NFS_OK); 821 } 822 823 static __be32 process_op(int nop, struct svc_rqst *rqstp, 824 struct xdr_stream *xdr_in, void *argp, 825 struct xdr_stream *xdr_out, void *resp, 826 struct cb_process_state *cps) 827 { 828 struct callback_op *op = &callback_ops[0]; 829 unsigned int op_nr; 830 __be32 status; 831 long maxlen; 832 __be32 res; 833 834 dprintk("%s: start\n", __func__); 835 status = decode_op_hdr(xdr_in, &op_nr); 836 if (unlikely(status)) 837 return status; 838 839 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 840 __func__, cps->minorversion, nop, op_nr); 841 842 switch (cps->minorversion) { 843 case 0: 844 status = preprocess_nfs4_op(op_nr, &op); 845 break; 846 case 1: 847 status = preprocess_nfs41_op(nop, op_nr, &op); 848 break; 849 case 2: 850 status = preprocess_nfs42_op(nop, op_nr, &op); 851 break; 852 default: 853 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 854 } 855 856 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 857 op_nr = OP_CB_ILLEGAL; 858 if (status) 859 goto encode_hdr; 860 861 if (cps->drc_status) { 862 status = cps->drc_status; 863 goto encode_hdr; 864 } 865 866 maxlen = xdr_out->end - xdr_out->p; 867 if (maxlen > 0 && maxlen < PAGE_SIZE) { 868 status = op->decode_args(rqstp, xdr_in, argp); 869 if (likely(status == 0)) 870 status = op->process_op(argp, resp, cps); 871 } else 872 status = htonl(NFS4ERR_RESOURCE); 873 874 encode_hdr: 875 res = encode_op_hdr(xdr_out, op_nr, status); 876 if (unlikely(res)) 877 return res; 878 if (op->encode_res != NULL && status == 0) 879 status = op->encode_res(rqstp, xdr_out, resp); 880 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 881 return status; 882 } 883 884 /* 885 * Decode, process and encode a COMPOUND 886 */ 887 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 888 { 889 struct cb_compound_hdr_arg hdr_arg = { 0 }; 890 struct cb_compound_hdr_res hdr_res = { NULL }; 891 struct xdr_stream xdr_in, xdr_out; 892 __be32 *p, status; 893 struct cb_process_state cps = { 894 .drc_status = 0, 895 .clp = NULL, 896 .slotid = NFS4_NO_SLOT, 897 .net = SVC_NET(rqstp), 898 }; 899 unsigned int nops = 0; 900 901 dprintk("%s: start\n", __func__); 902 903 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 904 905 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 906 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 907 908 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 909 if (status == htonl(NFS4ERR_RESOURCE)) 910 return rpc_garbage_args; 911 912 if (hdr_arg.minorversion == 0) { 913 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 914 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 915 return rpc_drop_reply; 916 } 917 918 cps.minorversion = hdr_arg.minorversion; 919 hdr_res.taglen = hdr_arg.taglen; 920 hdr_res.tag = hdr_arg.tag; 921 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 922 return rpc_system_err; 923 924 while (status == 0 && nops != hdr_arg.nops) { 925 status = process_op(nops, rqstp, &xdr_in, 926 argp, &xdr_out, resp, &cps); 927 nops++; 928 } 929 930 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 931 * resource error in cb_compound status without returning op */ 932 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 933 status = htonl(NFS4ERR_RESOURCE); 934 nops--; 935 } 936 937 *hdr_res.status = status; 938 *hdr_res.nops = htonl(nops); 939 nfs4_cb_free_slot(&cps); 940 nfs_put_client(cps.clp); 941 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 942 return rpc_success; 943 } 944 945 /* 946 * Define NFS4 callback COMPOUND ops. 947 */ 948 static struct callback_op callback_ops[] = { 949 [0] = { 950 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 951 }, 952 [OP_CB_GETATTR] = { 953 .process_op = (callback_process_op_t)nfs4_callback_getattr, 954 .decode_args = (callback_decode_arg_t)decode_getattr_args, 955 .encode_res = (callback_encode_res_t)encode_getattr_res, 956 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 957 }, 958 [OP_CB_RECALL] = { 959 .process_op = (callback_process_op_t)nfs4_callback_recall, 960 .decode_args = (callback_decode_arg_t)decode_recall_args, 961 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 962 }, 963 #if defined(CONFIG_NFS_V4_1) 964 [OP_CB_LAYOUTRECALL] = { 965 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall, 966 .decode_args = 967 (callback_decode_arg_t)decode_layoutrecall_args, 968 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 969 }, 970 [OP_CB_NOTIFY_DEVICEID] = { 971 .process_op = (callback_process_op_t)nfs4_callback_devicenotify, 972 .decode_args = 973 (callback_decode_arg_t)decode_devicenotify_args, 974 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 975 }, 976 [OP_CB_SEQUENCE] = { 977 .process_op = (callback_process_op_t)nfs4_callback_sequence, 978 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 979 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 980 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 981 }, 982 [OP_CB_RECALL_ANY] = { 983 .process_op = (callback_process_op_t)nfs4_callback_recallany, 984 .decode_args = (callback_decode_arg_t)decode_recallany_args, 985 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 986 }, 987 [OP_CB_RECALL_SLOT] = { 988 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 989 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 990 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 991 }, 992 #endif /* CONFIG_NFS_V4_1 */ 993 }; 994 995 /* 996 * Define NFS4 callback procedures 997 */ 998 static struct svc_procedure nfs4_callback_procedures1[] = { 999 [CB_NULL] = { 1000 .pc_func = nfs4_callback_null, 1001 .pc_decode = (kxdrproc_t)nfs4_decode_void, 1002 .pc_encode = (kxdrproc_t)nfs4_encode_void, 1003 .pc_xdrressize = 1, 1004 }, 1005 [CB_COMPOUND] = { 1006 .pc_func = nfs4_callback_compound, 1007 .pc_encode = (kxdrproc_t)nfs4_encode_void, 1008 .pc_argsize = 256, 1009 .pc_ressize = 256, 1010 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1011 } 1012 }; 1013 1014 struct svc_version nfs4_callback_version1 = { 1015 .vs_vers = 1, 1016 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1017 .vs_proc = nfs4_callback_procedures1, 1018 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1019 .vs_dispatch = NULL, 1020 .vs_hidden = 1, 1021 }; 1022 1023 struct svc_version nfs4_callback_version4 = { 1024 .vs_vers = 4, 1025 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1026 .vs_proc = nfs4_callback_procedures1, 1027 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1028 .vs_dispatch = NULL, 1029 .vs_hidden = 1, 1030 }; 1031