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 + CB_OP_TAGLEN_MAXSZ) 23#define CB_OP_GETATTR_BITMAP_MAXSZ (4) 24#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 25 CB_OP_GETATTR_BITMAP_MAXSZ + \ 26 2 + 2 + 3 + 3) 27#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 28 29#if defined(CONFIG_NFS_V4_1) 30#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 31#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 32#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 33 4 + 1 + 3) 34#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 35#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 36#endif /* CONFIG_NFS_V4_1 */ 37 38#define NFSDBG_FACILITY NFSDBG_CALLBACK 39 40/* Internal error code */ 41#define NFS4ERR_RESOURCE_HDR 11050 42 43typedef __be32 (*callback_process_op_t)(void *, void *, 44 struct cb_process_state *); 45typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 46typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 47 48 49struct callback_op { 50 callback_process_op_t process_op; 51 callback_decode_arg_t decode_args; 52 callback_encode_res_t encode_res; 53 long res_maxsize; 54}; 55 56static struct callback_op callback_ops[]; 57 58static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 59{ 60 return htonl(NFS4_OK); 61} 62 63static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 64{ 65 return xdr_argsize_check(rqstp, p); 66} 67 68static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 69{ 70 return xdr_ressize_check(rqstp, p); 71} 72 73static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) 74{ 75 __be32 *p; 76 77 p = xdr_inline_decode(xdr, nbytes); 78 if (unlikely(p == NULL)) 79 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n"); 80 return p; 81} 82 83static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 84{ 85 __be32 *p; 86 87 p = read_buf(xdr, 4); 88 if (unlikely(p == NULL)) 89 return htonl(NFS4ERR_RESOURCE); 90 *len = ntohl(*p); 91 92 if (*len != 0) { 93 p = read_buf(xdr, *len); 94 if (unlikely(p == NULL)) 95 return htonl(NFS4ERR_RESOURCE); 96 *str = (const char *)p; 97 } else 98 *str = NULL; 99 100 return 0; 101} 102 103static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 104{ 105 __be32 *p; 106 107 p = read_buf(xdr, 4); 108 if (unlikely(p == NULL)) 109 return htonl(NFS4ERR_RESOURCE); 110 fh->size = ntohl(*p); 111 if (fh->size > NFS4_FHSIZE) 112 return htonl(NFS4ERR_BADHANDLE); 113 p = read_buf(xdr, fh->size); 114 if (unlikely(p == NULL)) 115 return htonl(NFS4ERR_RESOURCE); 116 memcpy(&fh->data[0], p, fh->size); 117 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 118 return 0; 119} 120 121static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 122{ 123 __be32 *p; 124 unsigned int attrlen; 125 126 p = read_buf(xdr, 4); 127 if (unlikely(p == NULL)) 128 return htonl(NFS4ERR_RESOURCE); 129 attrlen = ntohl(*p); 130 p = read_buf(xdr, attrlen << 2); 131 if (unlikely(p == NULL)) 132 return htonl(NFS4ERR_RESOURCE); 133 if (likely(attrlen > 0)) 134 bitmap[0] = ntohl(*p++); 135 if (attrlen > 1) 136 bitmap[1] = ntohl(*p); 137 return 0; 138} 139 140static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 141{ 142 __be32 *p; 143 144 p = read_buf(xdr, NFS4_STATEID_SIZE); 145 if (unlikely(p == NULL)) 146 return htonl(NFS4ERR_RESOURCE); 147 memcpy(stateid, p, NFS4_STATEID_SIZE); 148 return 0; 149} 150 151static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 152{ 153 __be32 *p; 154 __be32 status; 155 156 status = decode_string(xdr, &hdr->taglen, &hdr->tag); 157 if (unlikely(status != 0)) 158 return status; 159 /* We do not like overly long tags! */ 160 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { 161 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n", 162 __func__, hdr->taglen); 163 return htonl(NFS4ERR_RESOURCE); 164 } 165 p = read_buf(xdr, 12); 166 if (unlikely(p == NULL)) 167 return htonl(NFS4ERR_RESOURCE); 168 hdr->minorversion = ntohl(*p++); 169 /* Check for minor version support */ 170 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) { 171 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */ 172 } else { 173 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with " 174 "illegal minor version %u!\n", 175 __func__, hdr->minorversion); 176 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 177 } 178 hdr->nops = ntohl(*p); 179 dprintk("%s: minorversion %d nops %d\n", __func__, 180 hdr->minorversion, hdr->nops); 181 return 0; 182} 183 184static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 185{ 186 __be32 *p; 187 p = read_buf(xdr, 4); 188 if (unlikely(p == NULL)) 189 return htonl(NFS4ERR_RESOURCE_HDR); 190 *op = ntohl(*p); 191 return 0; 192} 193 194static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 195{ 196 __be32 status; 197 198 status = decode_fh(xdr, &args->fh); 199 if (unlikely(status != 0)) 200 goto out; 201 args->addr = svc_addr(rqstp); 202 status = decode_bitmap(xdr, args->bitmap); 203out: 204 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 205 return status; 206} 207 208static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 209{ 210 __be32 *p; 211 __be32 status; 212 213 args->addr = svc_addr(rqstp); 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); 224out: 225 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 226 return status; 227} 228 229#if defined(CONFIG_NFS_V4_1) 230 231static __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 args->cbl_addr = svc_addr(rqstp); 240 p = read_buf(xdr, 4 * sizeof(uint32_t)); 241 if (unlikely(p == NULL)) { 242 status = htonl(NFS4ERR_BADXDR); 243 goto out; 244 } 245 246 args->cbl_layout_type = ntohl(*p++); 247 /* Depite the spec's xdr, iomode really belongs in the FILE switch, 248 * as it is unusable and ignored with the other types. 249 */ 250 iomode = ntohl(*p++); 251 args->cbl_layoutchanged = ntohl(*p++); 252 args->cbl_recall_type = ntohl(*p++); 253 254 if (args->cbl_recall_type == RETURN_FILE) { 255 args->cbl_range.iomode = iomode; 256 status = decode_fh(xdr, &args->cbl_fh); 257 if (unlikely(status != 0)) 258 goto out; 259 260 p = read_buf(xdr, 2 * sizeof(uint64_t)); 261 if (unlikely(p == NULL)) { 262 status = htonl(NFS4ERR_BADXDR); 263 goto out; 264 } 265 p = xdr_decode_hyper(p, &args->cbl_range.offset); 266 p = xdr_decode_hyper(p, &args->cbl_range.length); 267 status = decode_stateid(xdr, &args->cbl_stateid); 268 if (unlikely(status != 0)) 269 goto out; 270 } else if (args->cbl_recall_type == RETURN_FSID) { 271 p = read_buf(xdr, 2 * sizeof(uint64_t)); 272 if (unlikely(p == NULL)) { 273 status = htonl(NFS4ERR_BADXDR); 274 goto out; 275 } 276 p = xdr_decode_hyper(p, &args->cbl_fsid.major); 277 p = xdr_decode_hyper(p, &args->cbl_fsid.minor); 278 } else if (args->cbl_recall_type != RETURN_ALL) { 279 status = htonl(NFS4ERR_BADXDR); 280 goto out; 281 } 282 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n", 283 __func__, 284 args->cbl_layout_type, iomode, 285 args->cbl_layoutchanged, args->cbl_recall_type); 286out: 287 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 288 return status; 289} 290 291static 292__be32 decode_devicenotify_args(struct svc_rqst *rqstp, 293 struct xdr_stream *xdr, 294 struct cb_devicenotifyargs *args) 295{ 296 __be32 *p; 297 __be32 status = 0; 298 u32 tmp; 299 int n, i; 300 args->ndevs = 0; 301 302 /* Num of device notifications */ 303 p = read_buf(xdr, sizeof(uint32_t)); 304 if (unlikely(p == NULL)) { 305 status = htonl(NFS4ERR_BADXDR); 306 goto out; 307 } 308 n = ntohl(*p++); 309 if (n <= 0) 310 goto out; 311 if (n > ULONG_MAX / sizeof(*args->devs)) { 312 status = htonl(NFS4ERR_BADXDR); 313 goto out; 314 } 315 316 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL); 317 if (!args->devs) { 318 status = htonl(NFS4ERR_DELAY); 319 goto out; 320 } 321 322 /* Decode each dev notification */ 323 for (i = 0; i < n; i++) { 324 struct cb_devicenotifyitem *dev = &args->devs[i]; 325 326 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE); 327 if (unlikely(p == NULL)) { 328 status = htonl(NFS4ERR_BADXDR); 329 goto err; 330 } 331 332 tmp = ntohl(*p++); /* bitmap size */ 333 if (tmp != 1) { 334 status = htonl(NFS4ERR_INVAL); 335 goto err; 336 } 337 dev->cbd_notify_type = ntohl(*p++); 338 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE && 339 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) { 340 status = htonl(NFS4ERR_INVAL); 341 goto err; 342 } 343 344 tmp = ntohl(*p++); /* opaque size */ 345 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) && 346 (tmp != NFS4_DEVICEID4_SIZE + 8)) || 347 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) && 348 (tmp != NFS4_DEVICEID4_SIZE + 4))) { 349 status = htonl(NFS4ERR_INVAL); 350 goto err; 351 } 352 dev->cbd_layout_type = ntohl(*p++); 353 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE); 354 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); 355 356 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) { 357 p = read_buf(xdr, sizeof(uint32_t)); 358 if (unlikely(p == NULL)) { 359 status = htonl(NFS4ERR_BADXDR); 360 goto err; 361 } 362 dev->cbd_immediate = ntohl(*p++); 363 } else { 364 dev->cbd_immediate = 0; 365 } 366 367 args->ndevs++; 368 369 dprintk("%s: type %d layout 0x%x immediate %d\n", 370 __func__, dev->cbd_notify_type, dev->cbd_layout_type, 371 dev->cbd_immediate); 372 } 373out: 374 dprintk("%s: status %d ndevs %d\n", 375 __func__, ntohl(status), args->ndevs); 376 return status; 377err: 378 kfree(args->devs); 379 goto out; 380} 381 382static __be32 decode_sessionid(struct xdr_stream *xdr, 383 struct nfs4_sessionid *sid) 384{ 385 __be32 *p; 386 int len = NFS4_MAX_SESSIONID_LEN; 387 388 p = read_buf(xdr, len); 389 if (unlikely(p == NULL)) 390 return htonl(NFS4ERR_RESOURCE); 391 392 memcpy(sid->data, p, len); 393 return 0; 394} 395 396static __be32 decode_rc_list(struct xdr_stream *xdr, 397 struct referring_call_list *rc_list) 398{ 399 __be32 *p; 400 int i; 401 __be32 status; 402 403 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 404 if (status) 405 goto out; 406 407 status = htonl(NFS4ERR_RESOURCE); 408 p = read_buf(xdr, sizeof(uint32_t)); 409 if (unlikely(p == NULL)) 410 goto out; 411 412 rc_list->rcl_nrefcalls = ntohl(*p++); 413 if (rc_list->rcl_nrefcalls) { 414 p = read_buf(xdr, 415 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 416 if (unlikely(p == NULL)) 417 goto out; 418 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls, 419 sizeof(*rc_list->rcl_refcalls), 420 GFP_KERNEL); 421 if (unlikely(rc_list->rcl_refcalls == NULL)) 422 goto out; 423 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 424 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 425 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 426 } 427 } 428 status = 0; 429 430out: 431 return status; 432} 433 434static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp, 435 struct xdr_stream *xdr, 436 struct cb_sequenceargs *args) 437{ 438 __be32 *p; 439 int i; 440 __be32 status; 441 442 status = decode_sessionid(xdr, &args->csa_sessionid); 443 if (status) 444 goto out; 445 446 status = htonl(NFS4ERR_RESOURCE); 447 p = read_buf(xdr, 5 * sizeof(uint32_t)); 448 if (unlikely(p == NULL)) 449 goto out; 450 451 args->csa_addr = svc_addr(rqstp); 452 args->csa_sequenceid = ntohl(*p++); 453 args->csa_slotid = ntohl(*p++); 454 args->csa_highestslotid = ntohl(*p++); 455 args->csa_cachethis = ntohl(*p++); 456 args->csa_nrclists = ntohl(*p++); 457 args->csa_rclists = NULL; 458 if (args->csa_nrclists) { 459 args->csa_rclists = kmalloc_array(args->csa_nrclists, 460 sizeof(*args->csa_rclists), 461 GFP_KERNEL); 462 if (unlikely(args->csa_rclists == NULL)) 463 goto out; 464 465 for (i = 0; i < args->csa_nrclists; i++) { 466 status = decode_rc_list(xdr, &args->csa_rclists[i]); 467 if (status) { 468 args->csa_nrclists = i; 469 goto out_free; 470 } 471 } 472 } 473 status = 0; 474 475 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 476 "highestslotid %u cachethis %d nrclists %u\n", 477 __func__, 478 ((u32 *)&args->csa_sessionid)[0], 479 ((u32 *)&args->csa_sessionid)[1], 480 ((u32 *)&args->csa_sessionid)[2], 481 ((u32 *)&args->csa_sessionid)[3], 482 args->csa_sequenceid, args->csa_slotid, 483 args->csa_highestslotid, args->csa_cachethis, 484 args->csa_nrclists); 485out: 486 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 487 return status; 488 489out_free: 490 for (i = 0; i < args->csa_nrclists; i++) 491 kfree(args->csa_rclists[i].rcl_refcalls); 492 kfree(args->csa_rclists); 493 goto out; 494} 495 496static __be32 decode_recallany_args(struct svc_rqst *rqstp, 497 struct xdr_stream *xdr, 498 struct cb_recallanyargs *args) 499{ 500 uint32_t bitmap[2]; 501 __be32 *p, status; 502 503 args->craa_addr = svc_addr(rqstp); 504 p = read_buf(xdr, 4); 505 if (unlikely(p == NULL)) 506 return htonl(NFS4ERR_BADXDR); 507 args->craa_objs_to_keep = ntohl(*p++); 508 status = decode_bitmap(xdr, bitmap); 509 if (unlikely(status)) 510 return status; 511 args->craa_type_mask = bitmap[0]; 512 513 return 0; 514} 515 516static __be32 decode_recallslot_args(struct svc_rqst *rqstp, 517 struct xdr_stream *xdr, 518 struct cb_recallslotargs *args) 519{ 520 __be32 *p; 521 522 args->crsa_addr = svc_addr(rqstp); 523 p = read_buf(xdr, 4); 524 if (unlikely(p == NULL)) 525 return htonl(NFS4ERR_BADXDR); 526 args->crsa_target_highest_slotid = ntohl(*p++); 527 return 0; 528} 529 530#endif /* CONFIG_NFS_V4_1 */ 531 532static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 533{ 534 __be32 *p; 535 536 p = xdr_reserve_space(xdr, 4 + len); 537 if (unlikely(p == NULL)) 538 return htonl(NFS4ERR_RESOURCE); 539 xdr_encode_opaque(p, str, len); 540 return 0; 541} 542 543#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 544#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 545static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 546{ 547 __be32 bm[2]; 548 __be32 *p; 549 550 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 551 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 552 if (bm[1] != 0) { 553 p = xdr_reserve_space(xdr, 16); 554 if (unlikely(p == NULL)) 555 return htonl(NFS4ERR_RESOURCE); 556 *p++ = htonl(2); 557 *p++ = bm[0]; 558 *p++ = bm[1]; 559 } else if (bm[0] != 0) { 560 p = xdr_reserve_space(xdr, 12); 561 if (unlikely(p == NULL)) 562 return htonl(NFS4ERR_RESOURCE); 563 *p++ = htonl(1); 564 *p++ = bm[0]; 565 } else { 566 p = xdr_reserve_space(xdr, 8); 567 if (unlikely(p == NULL)) 568 return htonl(NFS4ERR_RESOURCE); 569 *p++ = htonl(0); 570 } 571 *savep = p; 572 return 0; 573} 574 575static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 576{ 577 __be32 *p; 578 579 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 580 return 0; 581 p = xdr_reserve_space(xdr, 8); 582 if (unlikely(!p)) 583 return htonl(NFS4ERR_RESOURCE); 584 p = xdr_encode_hyper(p, change); 585 return 0; 586} 587 588static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 589{ 590 __be32 *p; 591 592 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 593 return 0; 594 p = xdr_reserve_space(xdr, 8); 595 if (unlikely(!p)) 596 return htonl(NFS4ERR_RESOURCE); 597 p = xdr_encode_hyper(p, size); 598 return 0; 599} 600 601static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 602{ 603 __be32 *p; 604 605 p = xdr_reserve_space(xdr, 12); 606 if (unlikely(!p)) 607 return htonl(NFS4ERR_RESOURCE); 608 p = xdr_encode_hyper(p, time->tv_sec); 609 *p = htonl(time->tv_nsec); 610 return 0; 611} 612 613static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 614{ 615 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 616 return 0; 617 return encode_attr_time(xdr,time); 618} 619 620static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 621{ 622 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 623 return 0; 624 return encode_attr_time(xdr,time); 625} 626 627static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 628{ 629 __be32 status; 630 631 hdr->status = xdr_reserve_space(xdr, 4); 632 if (unlikely(hdr->status == NULL)) 633 return htonl(NFS4ERR_RESOURCE); 634 status = encode_string(xdr, hdr->taglen, hdr->tag); 635 if (unlikely(status != 0)) 636 return status; 637 hdr->nops = xdr_reserve_space(xdr, 4); 638 if (unlikely(hdr->nops == NULL)) 639 return htonl(NFS4ERR_RESOURCE); 640 return 0; 641} 642 643static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 644{ 645 __be32 *p; 646 647 p = xdr_reserve_space(xdr, 8); 648 if (unlikely(p == NULL)) 649 return htonl(NFS4ERR_RESOURCE_HDR); 650 *p++ = htonl(op); 651 *p = res; 652 return 0; 653} 654 655static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 656{ 657 __be32 *savep = NULL; 658 __be32 status = res->status; 659 660 if (unlikely(status != 0)) 661 goto out; 662 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 663 if (unlikely(status != 0)) 664 goto out; 665 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 666 if (unlikely(status != 0)) 667 goto out; 668 status = encode_attr_size(xdr, res->bitmap, res->size); 669 if (unlikely(status != 0)) 670 goto out; 671 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 672 if (unlikely(status != 0)) 673 goto out; 674 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 675 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 676out: 677 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 678 return status; 679} 680 681#if defined(CONFIG_NFS_V4_1) 682 683static __be32 encode_sessionid(struct xdr_stream *xdr, 684 const struct nfs4_sessionid *sid) 685{ 686 __be32 *p; 687 int len = NFS4_MAX_SESSIONID_LEN; 688 689 p = xdr_reserve_space(xdr, len); 690 if (unlikely(p == NULL)) 691 return htonl(NFS4ERR_RESOURCE); 692 693 memcpy(p, sid, len); 694 return 0; 695} 696 697static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp, 698 struct xdr_stream *xdr, 699 const struct cb_sequenceres *res) 700{ 701 __be32 *p; 702 __be32 status = res->csr_status; 703 704 if (unlikely(status != 0)) 705 goto out; 706 707 encode_sessionid(xdr, &res->csr_sessionid); 708 709 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 710 if (unlikely(p == NULL)) 711 return htonl(NFS4ERR_RESOURCE); 712 713 *p++ = htonl(res->csr_sequenceid); 714 *p++ = htonl(res->csr_slotid); 715 *p++ = htonl(res->csr_highestslotid); 716 *p++ = htonl(res->csr_target_highestslotid); 717out: 718 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 719 return status; 720} 721 722static __be32 723preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 724{ 725 if (op_nr == OP_CB_SEQUENCE) { 726 if (nop != 0) 727 return htonl(NFS4ERR_SEQUENCE_POS); 728 } else { 729 if (nop == 0) 730 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 731 } 732 733 switch (op_nr) { 734 case OP_CB_GETATTR: 735 case OP_CB_RECALL: 736 case OP_CB_SEQUENCE: 737 case OP_CB_RECALL_ANY: 738 case OP_CB_RECALL_SLOT: 739 case OP_CB_LAYOUTRECALL: 740 case OP_CB_NOTIFY_DEVICEID: 741 *op = &callback_ops[op_nr]; 742 break; 743 744 case OP_CB_NOTIFY: 745 case OP_CB_PUSH_DELEG: 746 case OP_CB_RECALLABLE_OBJ_AVAIL: 747 case OP_CB_WANTS_CANCELLED: 748 case OP_CB_NOTIFY_LOCK: 749 return htonl(NFS4ERR_NOTSUPP); 750 751 default: 752 return htonl(NFS4ERR_OP_ILLEGAL); 753 } 754 755 return htonl(NFS_OK); 756} 757 758static void nfs4_callback_free_slot(struct nfs4_session *session) 759{ 760 struct nfs4_slot_table *tbl = &session->bc_slot_table; 761 762 spin_lock(&tbl->slot_tbl_lock); 763 /* 764 * Let the state manager know callback processing done. 765 * A single slot, so highest used slotid is either 0 or -1 766 */ 767 tbl->highest_used_slotid = NFS4_NO_SLOT; 768 nfs4_slot_tbl_drain_complete(tbl); 769 spin_unlock(&tbl->slot_tbl_lock); 770} 771 772static void nfs4_cb_free_slot(struct cb_process_state *cps) 773{ 774 if (cps->slotid != NFS4_NO_SLOT) 775 nfs4_callback_free_slot(cps->clp->cl_session); 776} 777 778#else /* CONFIG_NFS_V4_1 */ 779 780static __be32 781preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 782{ 783 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 784} 785 786static void nfs4_cb_free_slot(struct cb_process_state *cps) 787{ 788} 789#endif /* CONFIG_NFS_V4_1 */ 790 791#ifdef CONFIG_NFS_V4_2 792static __be32 793preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 794{ 795 __be32 status = preprocess_nfs41_op(nop, op_nr, op); 796 if (status != htonl(NFS4ERR_OP_ILLEGAL)) 797 return status; 798 799 if (op_nr == OP_CB_OFFLOAD) 800 return htonl(NFS4ERR_NOTSUPP); 801 return htonl(NFS4ERR_OP_ILLEGAL); 802} 803#else /* CONFIG_NFS_V4_2 */ 804static __be32 805preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op) 806{ 807 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 808} 809#endif /* CONFIG_NFS_V4_2 */ 810 811static __be32 812preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 813{ 814 switch (op_nr) { 815 case OP_CB_GETATTR: 816 case OP_CB_RECALL: 817 *op = &callback_ops[op_nr]; 818 break; 819 default: 820 return htonl(NFS4ERR_OP_ILLEGAL); 821 } 822 823 return htonl(NFS_OK); 824} 825 826static __be32 process_op(int nop, struct svc_rqst *rqstp, 827 struct xdr_stream *xdr_in, void *argp, 828 struct xdr_stream *xdr_out, void *resp, 829 struct cb_process_state *cps) 830{ 831 struct callback_op *op = &callback_ops[0]; 832 unsigned int op_nr; 833 __be32 status; 834 long maxlen; 835 __be32 res; 836 837 dprintk("%s: start\n", __func__); 838 status = decode_op_hdr(xdr_in, &op_nr); 839 if (unlikely(status)) 840 return status; 841 842 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 843 __func__, cps->minorversion, nop, op_nr); 844 845 switch (cps->minorversion) { 846 case 0: 847 status = preprocess_nfs4_op(op_nr, &op); 848 break; 849 case 1: 850 status = preprocess_nfs41_op(nop, op_nr, &op); 851 break; 852 case 2: 853 status = preprocess_nfs42_op(nop, op_nr, &op); 854 break; 855 default: 856 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH); 857 } 858 859 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 860 op_nr = OP_CB_ILLEGAL; 861 if (status) 862 goto encode_hdr; 863 864 if (cps->drc_status) { 865 status = cps->drc_status; 866 goto encode_hdr; 867 } 868 869 maxlen = xdr_out->end - xdr_out->p; 870 if (maxlen > 0 && maxlen < PAGE_SIZE) { 871 status = op->decode_args(rqstp, xdr_in, argp); 872 if (likely(status == 0)) 873 status = op->process_op(argp, resp, cps); 874 } else 875 status = htonl(NFS4ERR_RESOURCE); 876 877encode_hdr: 878 res = encode_op_hdr(xdr_out, op_nr, status); 879 if (unlikely(res)) 880 return res; 881 if (op->encode_res != NULL && status == 0) 882 status = op->encode_res(rqstp, xdr_out, resp); 883 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 884 return status; 885} 886 887/* 888 * Decode, process and encode a COMPOUND 889 */ 890static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 891{ 892 struct cb_compound_hdr_arg hdr_arg = { 0 }; 893 struct cb_compound_hdr_res hdr_res = { NULL }; 894 struct xdr_stream xdr_in, xdr_out; 895 __be32 *p, status; 896 struct cb_process_state cps = { 897 .drc_status = 0, 898 .clp = NULL, 899 .slotid = NFS4_NO_SLOT, 900 .net = SVC_NET(rqstp), 901 }; 902 unsigned int nops = 0; 903 904 dprintk("%s: start\n", __func__); 905 906 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 907 908 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 909 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 910 911 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 912 if (status == __constant_htonl(NFS4ERR_RESOURCE)) 913 return rpc_garbage_args; 914 915 if (hdr_arg.minorversion == 0) { 916 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); 917 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) 918 return rpc_drop_reply; 919 } 920 921 cps.minorversion = hdr_arg.minorversion; 922 hdr_res.taglen = hdr_arg.taglen; 923 hdr_res.tag = hdr_arg.tag; 924 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 925 return rpc_system_err; 926 927 while (status == 0 && nops != hdr_arg.nops) { 928 status = process_op(nops, rqstp, &xdr_in, 929 argp, &xdr_out, resp, &cps); 930 nops++; 931 } 932 933 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return 934 * resource error in cb_compound status without returning op */ 935 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) { 936 status = htonl(NFS4ERR_RESOURCE); 937 nops--; 938 } 939 940 *hdr_res.status = status; 941 *hdr_res.nops = htonl(nops); 942 nfs4_cb_free_slot(&cps); 943 nfs_put_client(cps.clp); 944 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 945 return rpc_success; 946} 947 948/* 949 * Define NFS4 callback COMPOUND ops. 950 */ 951static struct callback_op callback_ops[] = { 952 [0] = { 953 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 954 }, 955 [OP_CB_GETATTR] = { 956 .process_op = (callback_process_op_t)nfs4_callback_getattr, 957 .decode_args = (callback_decode_arg_t)decode_getattr_args, 958 .encode_res = (callback_encode_res_t)encode_getattr_res, 959 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 960 }, 961 [OP_CB_RECALL] = { 962 .process_op = (callback_process_op_t)nfs4_callback_recall, 963 .decode_args = (callback_decode_arg_t)decode_recall_args, 964 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 965 }, 966#if defined(CONFIG_NFS_V4_1) 967 [OP_CB_LAYOUTRECALL] = { 968 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall, 969 .decode_args = 970 (callback_decode_arg_t)decode_layoutrecall_args, 971 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, 972 }, 973 [OP_CB_NOTIFY_DEVICEID] = { 974 .process_op = (callback_process_op_t)nfs4_callback_devicenotify, 975 .decode_args = 976 (callback_decode_arg_t)decode_devicenotify_args, 977 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, 978 }, 979 [OP_CB_SEQUENCE] = { 980 .process_op = (callback_process_op_t)nfs4_callback_sequence, 981 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 982 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 983 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 984 }, 985 [OP_CB_RECALL_ANY] = { 986 .process_op = (callback_process_op_t)nfs4_callback_recallany, 987 .decode_args = (callback_decode_arg_t)decode_recallany_args, 988 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 989 }, 990 [OP_CB_RECALL_SLOT] = { 991 .process_op = (callback_process_op_t)nfs4_callback_recallslot, 992 .decode_args = (callback_decode_arg_t)decode_recallslot_args, 993 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, 994 }, 995#endif /* CONFIG_NFS_V4_1 */ 996}; 997 998/* 999 * Define NFS4 callback procedures 1000 */ 1001static struct svc_procedure nfs4_callback_procedures1[] = { 1002 [CB_NULL] = { 1003 .pc_func = nfs4_callback_null, 1004 .pc_decode = (kxdrproc_t)nfs4_decode_void, 1005 .pc_encode = (kxdrproc_t)nfs4_encode_void, 1006 .pc_xdrressize = 1, 1007 }, 1008 [CB_COMPOUND] = { 1009 .pc_func = nfs4_callback_compound, 1010 .pc_encode = (kxdrproc_t)nfs4_encode_void, 1011 .pc_argsize = 256, 1012 .pc_ressize = 256, 1013 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 1014 } 1015}; 1016 1017struct svc_version nfs4_callback_version1 = { 1018 .vs_vers = 1, 1019 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1020 .vs_proc = nfs4_callback_procedures1, 1021 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1022 .vs_dispatch = NULL, 1023 .vs_hidden = 1, 1024}; 1025 1026struct svc_version nfs4_callback_version4 = { 1027 .vs_vers = 4, 1028 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 1029 .vs_proc = nfs4_callback_procedures1, 1030 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 1031 .vs_dispatch = NULL, 1032 .vs_hidden = 1, 1033}; 1034