1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * XDR standard data types and function declarations 4 * 5 * Copyright (C) 1995-1997 Olaf Kirch <[email protected]> 6 * 7 * Based on: 8 * RFC 4506 "XDR: External Data Representation Standard", May 2006 9 */ 10 11 #ifndef _SUNRPC_XDR_H_ 12 #define _SUNRPC_XDR_H_ 13 14 #include <linux/uio.h> 15 #include <asm/byteorder.h> 16 #include <asm/unaligned.h> 17 #include <linux/scatterlist.h> 18 19 struct bio_vec; 20 struct rpc_rqst; 21 22 /* 23 * Buffer adjustment 24 */ 25 #define XDR_QUADLEN(l) (((l) + 3) >> 2) 26 27 /* 28 * Generic opaque `network object.' 29 */ 30 #define XDR_MAX_NETOBJ 1024 31 struct xdr_netobj { 32 unsigned int len; 33 u8 * data; 34 }; 35 36 /* 37 * Basic structure for transmission/reception of a client XDR message. 38 * Features a header (for a linear buffer containing RPC headers 39 * and the data payload for short messages), and then an array of 40 * pages. 41 * The tail iovec allows you to append data after the page array. Its 42 * main interest is for appending padding to the pages in order to 43 * satisfy the int_32-alignment requirements in RFC1832. 44 * 45 * For the future, we might want to string several of these together 46 * in a list if anybody wants to make use of NFSv4 COMPOUND 47 * operations and/or has a need for scatter/gather involving pages. 48 */ 49 struct xdr_buf { 50 struct kvec head[1], /* RPC header + non-page data */ 51 tail[1]; /* Appended after page data */ 52 53 struct bio_vec *bvec; 54 struct page ** pages; /* Array of pages */ 55 unsigned int page_base, /* Start of page data */ 56 page_len, /* Length of page data */ 57 flags; /* Flags for data disposition */ 58 #define XDRBUF_READ 0x01 /* target of file read */ 59 #define XDRBUF_WRITE 0x02 /* source of file write */ 60 #define XDRBUF_SPARSE_PAGES 0x04 /* Page array is sparse */ 61 62 unsigned int buflen, /* Total length of storage buffer */ 63 len; /* Length of XDR encoded message */ 64 }; 65 66 static inline void 67 xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) 68 { 69 buf->head[0].iov_base = start; 70 buf->head[0].iov_len = len; 71 buf->tail[0].iov_len = 0; 72 buf->pages = NULL; 73 buf->page_len = 0; 74 buf->flags = 0; 75 buf->len = 0; 76 buf->buflen = len; 77 } 78 79 /* 80 * pre-xdr'ed macros. 81 */ 82 83 #define xdr_zero cpu_to_be32(0) 84 #define xdr_one cpu_to_be32(1) 85 #define xdr_two cpu_to_be32(2) 86 87 #define rpc_auth_null cpu_to_be32(RPC_AUTH_NULL) 88 #define rpc_auth_unix cpu_to_be32(RPC_AUTH_UNIX) 89 #define rpc_auth_short cpu_to_be32(RPC_AUTH_SHORT) 90 #define rpc_auth_gss cpu_to_be32(RPC_AUTH_GSS) 91 92 #define rpc_call cpu_to_be32(RPC_CALL) 93 #define rpc_reply cpu_to_be32(RPC_REPLY) 94 95 #define rpc_msg_accepted cpu_to_be32(RPC_MSG_ACCEPTED) 96 97 #define rpc_success cpu_to_be32(RPC_SUCCESS) 98 #define rpc_prog_unavail cpu_to_be32(RPC_PROG_UNAVAIL) 99 #define rpc_prog_mismatch cpu_to_be32(RPC_PROG_MISMATCH) 100 #define rpc_proc_unavail cpu_to_be32(RPC_PROC_UNAVAIL) 101 #define rpc_garbage_args cpu_to_be32(RPC_GARBAGE_ARGS) 102 #define rpc_system_err cpu_to_be32(RPC_SYSTEM_ERR) 103 #define rpc_drop_reply cpu_to_be32(RPC_DROP_REPLY) 104 105 #define rpc_mismatch cpu_to_be32(RPC_MISMATCH) 106 #define rpc_auth_error cpu_to_be32(RPC_AUTH_ERROR) 107 108 #define rpc_auth_ok cpu_to_be32(RPC_AUTH_OK) 109 #define rpc_autherr_badcred cpu_to_be32(RPC_AUTH_BADCRED) 110 #define rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED) 111 #define rpc_autherr_badverf cpu_to_be32(RPC_AUTH_BADVERF) 112 #define rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF) 113 #define rpc_autherr_tooweak cpu_to_be32(RPC_AUTH_TOOWEAK) 114 #define rpcsec_gsserr_credproblem cpu_to_be32(RPCSEC_GSS_CREDPROBLEM) 115 #define rpcsec_gsserr_ctxproblem cpu_to_be32(RPCSEC_GSS_CTXPROBLEM) 116 117 /* 118 * Miscellaneous XDR helper functions 119 */ 120 __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len); 121 __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len); 122 __be32 *xdr_encode_string(__be32 *p, const char *s); 123 __be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp, 124 unsigned int maxlen); 125 __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *); 126 __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *); 127 128 void xdr_inline_pages(struct xdr_buf *, unsigned int, 129 struct page **, unsigned int, unsigned int); 130 void xdr_terminate_string(const struct xdr_buf *, const u32); 131 size_t xdr_buf_pagecount(const struct xdr_buf *buf); 132 int xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp); 133 void xdr_free_bvec(struct xdr_buf *buf); 134 135 static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len) 136 { 137 return xdr_encode_opaque(p, s, len); 138 } 139 140 /* 141 * Decode 64bit quantities (NFSv3 support) 142 */ 143 static inline __be32 * 144 xdr_encode_hyper(__be32 *p, __u64 val) 145 { 146 put_unaligned_be64(val, p); 147 return p + 2; 148 } 149 150 static inline __be32 * 151 xdr_decode_hyper(__be32 *p, __u64 *valp) 152 { 153 *valp = get_unaligned_be64(p); 154 return p + 2; 155 } 156 157 static inline __be32 * 158 xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len) 159 { 160 memcpy(ptr, p, len); 161 return p + XDR_QUADLEN(len); 162 } 163 164 static inline void xdr_netobj_dup(struct xdr_netobj *dst, 165 struct xdr_netobj *src, gfp_t gfp_mask) 166 { 167 dst->data = kmemdup(src->data, src->len, gfp_mask); 168 dst->len = src->len; 169 } 170 171 /* 172 * Adjust kvec to reflect end of xdr'ed data (RPC client XDR) 173 */ 174 static inline int 175 xdr_adjust_iovec(struct kvec *iov, __be32 *p) 176 { 177 return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base); 178 } 179 180 /* 181 * XDR buffer helper functions 182 */ 183 extern void xdr_shift_buf(struct xdr_buf *, size_t); 184 extern void xdr_buf_from_iov(const struct kvec *, struct xdr_buf *); 185 extern int xdr_buf_subsegment(const struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int); 186 extern void xdr_buf_trim(struct xdr_buf *, unsigned int); 187 extern int read_bytes_from_xdr_buf(const struct xdr_buf *, unsigned int, void *, unsigned int); 188 extern int write_bytes_to_xdr_buf(const struct xdr_buf *, unsigned int, void *, unsigned int); 189 190 extern int xdr_encode_word(const struct xdr_buf *, unsigned int, u32); 191 extern int xdr_decode_word(const struct xdr_buf *, unsigned int, u32 *); 192 193 struct xdr_array2_desc; 194 typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem); 195 struct xdr_array2_desc { 196 unsigned int elem_size; 197 unsigned int array_len; 198 unsigned int array_maxlen; 199 xdr_xcode_elem_t xcode; 200 }; 201 202 extern int xdr_decode_array2(const struct xdr_buf *buf, unsigned int base, 203 struct xdr_array2_desc *desc); 204 extern int xdr_encode_array2(const struct xdr_buf *buf, unsigned int base, 205 struct xdr_array2_desc *desc); 206 extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase, 207 size_t len); 208 209 /* 210 * Provide some simple tools for XDR buffer overflow-checking etc. 211 */ 212 struct xdr_stream { 213 __be32 *p; /* start of available buffer */ 214 struct xdr_buf *buf; /* XDR buffer to read/write */ 215 216 __be32 *end; /* end of available buffer space */ 217 struct kvec *iov; /* pointer to the current kvec */ 218 struct kvec scratch; /* Scratch buffer */ 219 struct page **page_ptr; /* pointer to the current page */ 220 unsigned int nwords; /* Remaining decode buffer length */ 221 222 struct rpc_rqst *rqst; /* For debugging */ 223 }; 224 225 /* 226 * These are the xdr_stream style generic XDR encode and decode functions. 227 */ 228 typedef void (*kxdreproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr, 229 const void *obj); 230 typedef int (*kxdrdproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr, 231 void *obj); 232 233 extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, 234 __be32 *p, struct rpc_rqst *rqst); 235 extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes); 236 extern int xdr_reserve_space_vec(struct xdr_stream *xdr, struct kvec *vec, 237 size_t nbytes); 238 extern void xdr_commit_encode(struct xdr_stream *xdr); 239 extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len); 240 extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen); 241 extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages, 242 unsigned int base, unsigned int len); 243 extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr); 244 extern unsigned int xdr_page_pos(const struct xdr_stream *xdr); 245 extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, 246 __be32 *p, struct rpc_rqst *rqst); 247 extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf, 248 struct page **pages, unsigned int len); 249 extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes); 250 extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len); 251 extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len); 252 extern int xdr_process_buf(const struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data); 253 extern unsigned int xdr_align_data(struct xdr_stream *, unsigned int offset, unsigned int length); 254 extern unsigned int xdr_expand_hole(struct xdr_stream *, unsigned int offset, unsigned int length); 255 extern bool xdr_stream_subsegment(struct xdr_stream *xdr, struct xdr_buf *subbuf, 256 unsigned int len); 257 258 /** 259 * xdr_set_scratch_buffer - Attach a scratch buffer for decoding data. 260 * @xdr: pointer to xdr_stream struct 261 * @buf: pointer to an empty buffer 262 * @buflen: size of 'buf' 263 * 264 * The scratch buffer is used when decoding from an array of pages. 265 * If an xdr_inline_decode() call spans across page boundaries, then 266 * we copy the data into the scratch buffer in order to allow linear 267 * access. 268 */ 269 static inline void 270 xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen) 271 { 272 xdr->scratch.iov_base = buf; 273 xdr->scratch.iov_len = buflen; 274 } 275 276 /** 277 * xdr_set_scratch_page - Attach a scratch buffer for decoding data 278 * @xdr: pointer to xdr_stream struct 279 * @page: an anonymous page 280 * 281 * See xdr_set_scratch_buffer(). 282 */ 283 static inline void 284 xdr_set_scratch_page(struct xdr_stream *xdr, struct page *page) 285 { 286 xdr_set_scratch_buffer(xdr, page_address(page), PAGE_SIZE); 287 } 288 289 /** 290 * xdr_reset_scratch_buffer - Clear scratch buffer information 291 * @xdr: pointer to xdr_stream struct 292 * 293 * See xdr_set_scratch_buffer(). 294 */ 295 static inline void 296 xdr_reset_scratch_buffer(struct xdr_stream *xdr) 297 { 298 xdr_set_scratch_buffer(xdr, NULL, 0); 299 } 300 301 /** 302 * xdr_stream_remaining - Return the number of bytes remaining in the stream 303 * @xdr: pointer to struct xdr_stream 304 * 305 * Return value: 306 * Number of bytes remaining in @xdr before xdr->end 307 */ 308 static inline size_t 309 xdr_stream_remaining(const struct xdr_stream *xdr) 310 { 311 return xdr->nwords << 2; 312 } 313 314 ssize_t xdr_stream_decode_opaque(struct xdr_stream *xdr, void *ptr, 315 size_t size); 316 ssize_t xdr_stream_decode_opaque_dup(struct xdr_stream *xdr, void **ptr, 317 size_t maxlen, gfp_t gfp_flags); 318 ssize_t xdr_stream_decode_string(struct xdr_stream *xdr, char *str, 319 size_t size); 320 ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str, 321 size_t maxlen, gfp_t gfp_flags); 322 /** 323 * xdr_align_size - Calculate padded size of an object 324 * @n: Size of an object being XDR encoded (in bytes) 325 * 326 * Return value: 327 * Size (in bytes) of the object including xdr padding 328 */ 329 static inline size_t 330 xdr_align_size(size_t n) 331 { 332 const size_t mask = sizeof(__u32) - 1; 333 334 return (n + mask) & ~mask; 335 } 336 337 /** 338 * xdr_pad_size - Calculate size of an object's pad 339 * @n: Size of an object being XDR encoded (in bytes) 340 * 341 * This implementation avoids the need for conditional 342 * branches or modulo division. 343 * 344 * Return value: 345 * Size (in bytes) of the needed XDR pad 346 */ 347 static inline size_t xdr_pad_size(size_t n) 348 { 349 return xdr_align_size(n) - n; 350 } 351 352 /** 353 * xdr_stream_encode_item_present - Encode a "present" list item 354 * @xdr: pointer to xdr_stream 355 * 356 * Return values: 357 * On success, returns length in bytes of XDR buffer consumed 358 * %-EMSGSIZE on XDR buffer overflow 359 */ 360 static inline ssize_t xdr_stream_encode_item_present(struct xdr_stream *xdr) 361 { 362 const size_t len = sizeof(__be32); 363 __be32 *p = xdr_reserve_space(xdr, len); 364 365 if (unlikely(!p)) 366 return -EMSGSIZE; 367 *p = xdr_one; 368 return len; 369 } 370 371 /** 372 * xdr_stream_encode_item_absent - Encode a "not present" list item 373 * @xdr: pointer to xdr_stream 374 * 375 * Return values: 376 * On success, returns length in bytes of XDR buffer consumed 377 * %-EMSGSIZE on XDR buffer overflow 378 */ 379 static inline int xdr_stream_encode_item_absent(struct xdr_stream *xdr) 380 { 381 const size_t len = sizeof(__be32); 382 __be32 *p = xdr_reserve_space(xdr, len); 383 384 if (unlikely(!p)) 385 return -EMSGSIZE; 386 *p = xdr_zero; 387 return len; 388 } 389 390 /** 391 * xdr_stream_encode_u32 - Encode a 32-bit integer 392 * @xdr: pointer to xdr_stream 393 * @n: integer to encode 394 * 395 * Return values: 396 * On success, returns length in bytes of XDR buffer consumed 397 * %-EMSGSIZE on XDR buffer overflow 398 */ 399 static inline ssize_t 400 xdr_stream_encode_u32(struct xdr_stream *xdr, __u32 n) 401 { 402 const size_t len = sizeof(n); 403 __be32 *p = xdr_reserve_space(xdr, len); 404 405 if (unlikely(!p)) 406 return -EMSGSIZE; 407 *p = cpu_to_be32(n); 408 return len; 409 } 410 411 /** 412 * xdr_stream_encode_u64 - Encode a 64-bit integer 413 * @xdr: pointer to xdr_stream 414 * @n: 64-bit integer to encode 415 * 416 * Return values: 417 * On success, returns length in bytes of XDR buffer consumed 418 * %-EMSGSIZE on XDR buffer overflow 419 */ 420 static inline ssize_t 421 xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n) 422 { 423 const size_t len = sizeof(n); 424 __be32 *p = xdr_reserve_space(xdr, len); 425 426 if (unlikely(!p)) 427 return -EMSGSIZE; 428 xdr_encode_hyper(p, n); 429 return len; 430 } 431 432 /** 433 * xdr_stream_encode_opaque_inline - Encode opaque xdr data 434 * @xdr: pointer to xdr_stream 435 * @ptr: pointer to void pointer 436 * @len: size of object 437 * 438 * Return values: 439 * On success, returns length in bytes of XDR buffer consumed 440 * %-EMSGSIZE on XDR buffer overflow 441 */ 442 static inline ssize_t 443 xdr_stream_encode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t len) 444 { 445 size_t count = sizeof(__u32) + xdr_align_size(len); 446 __be32 *p = xdr_reserve_space(xdr, count); 447 448 if (unlikely(!p)) { 449 *ptr = NULL; 450 return -EMSGSIZE; 451 } 452 xdr_encode_opaque(p, NULL, len); 453 *ptr = ++p; 454 return count; 455 } 456 457 /** 458 * xdr_stream_encode_opaque_fixed - Encode fixed length opaque xdr data 459 * @xdr: pointer to xdr_stream 460 * @ptr: pointer to opaque data object 461 * @len: size of object pointed to by @ptr 462 * 463 * Return values: 464 * On success, returns length in bytes of XDR buffer consumed 465 * %-EMSGSIZE on XDR buffer overflow 466 */ 467 static inline ssize_t 468 xdr_stream_encode_opaque_fixed(struct xdr_stream *xdr, const void *ptr, size_t len) 469 { 470 __be32 *p = xdr_reserve_space(xdr, len); 471 472 if (unlikely(!p)) 473 return -EMSGSIZE; 474 xdr_encode_opaque_fixed(p, ptr, len); 475 return xdr_align_size(len); 476 } 477 478 /** 479 * xdr_stream_encode_opaque - Encode variable length opaque xdr data 480 * @xdr: pointer to xdr_stream 481 * @ptr: pointer to opaque data object 482 * @len: size of object pointed to by @ptr 483 * 484 * Return values: 485 * On success, returns length in bytes of XDR buffer consumed 486 * %-EMSGSIZE on XDR buffer overflow 487 */ 488 static inline ssize_t 489 xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len) 490 { 491 size_t count = sizeof(__u32) + xdr_align_size(len); 492 __be32 *p = xdr_reserve_space(xdr, count); 493 494 if (unlikely(!p)) 495 return -EMSGSIZE; 496 xdr_encode_opaque(p, ptr, len); 497 return count; 498 } 499 500 /** 501 * xdr_stream_encode_uint32_array - Encode variable length array of integers 502 * @xdr: pointer to xdr_stream 503 * @array: array of integers 504 * @array_size: number of elements in @array 505 * 506 * Return values: 507 * On success, returns length in bytes of XDR buffer consumed 508 * %-EMSGSIZE on XDR buffer overflow 509 */ 510 static inline ssize_t 511 xdr_stream_encode_uint32_array(struct xdr_stream *xdr, 512 const __u32 *array, size_t array_size) 513 { 514 ssize_t ret = (array_size+1) * sizeof(__u32); 515 __be32 *p = xdr_reserve_space(xdr, ret); 516 517 if (unlikely(!p)) 518 return -EMSGSIZE; 519 *p++ = cpu_to_be32(array_size); 520 for (; array_size > 0; p++, array++, array_size--) 521 *p = cpu_to_be32p(array); 522 return ret; 523 } 524 525 /** 526 * xdr_item_is_absent - symbolically handle XDR discriminators 527 * @p: pointer to undecoded discriminator 528 * 529 * Return values: 530 * %true if the following XDR item is absent 531 * %false if the following XDR item is present 532 */ 533 static inline bool xdr_item_is_absent(const __be32 *p) 534 { 535 return *p == xdr_zero; 536 } 537 538 /** 539 * xdr_item_is_present - symbolically handle XDR discriminators 540 * @p: pointer to undecoded discriminator 541 * 542 * Return values: 543 * %true if the following XDR item is present 544 * %false if the following XDR item is absent 545 */ 546 static inline bool xdr_item_is_present(const __be32 *p) 547 { 548 return *p != xdr_zero; 549 } 550 551 /** 552 * xdr_stream_decode_bool - Decode a boolean 553 * @xdr: pointer to xdr_stream 554 * @ptr: pointer to a u32 in which to store the result 555 * 556 * Return values: 557 * %0 on success 558 * %-EBADMSG on XDR buffer overflow 559 */ 560 static inline ssize_t 561 xdr_stream_decode_bool(struct xdr_stream *xdr, __u32 *ptr) 562 { 563 const size_t count = sizeof(*ptr); 564 __be32 *p = xdr_inline_decode(xdr, count); 565 566 if (unlikely(!p)) 567 return -EBADMSG; 568 *ptr = (*p != xdr_zero); 569 return 0; 570 } 571 572 /** 573 * xdr_stream_decode_u32 - Decode a 32-bit integer 574 * @xdr: pointer to xdr_stream 575 * @ptr: location to store integer 576 * 577 * Return values: 578 * %0 on success 579 * %-EBADMSG on XDR buffer overflow 580 */ 581 static inline ssize_t 582 xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr) 583 { 584 const size_t count = sizeof(*ptr); 585 __be32 *p = xdr_inline_decode(xdr, count); 586 587 if (unlikely(!p)) 588 return -EBADMSG; 589 *ptr = be32_to_cpup(p); 590 return 0; 591 } 592 593 /** 594 * xdr_stream_decode_u64 - Decode a 64-bit integer 595 * @xdr: pointer to xdr_stream 596 * @ptr: location to store 64-bit integer 597 * 598 * Return values: 599 * %0 on success 600 * %-EBADMSG on XDR buffer overflow 601 */ 602 static inline ssize_t 603 xdr_stream_decode_u64(struct xdr_stream *xdr, __u64 *ptr) 604 { 605 const size_t count = sizeof(*ptr); 606 __be32 *p = xdr_inline_decode(xdr, count); 607 608 if (unlikely(!p)) 609 return -EBADMSG; 610 xdr_decode_hyper(p, ptr); 611 return 0; 612 } 613 614 /** 615 * xdr_stream_decode_opaque_fixed - Decode fixed length opaque xdr data 616 * @xdr: pointer to xdr_stream 617 * @ptr: location to store data 618 * @len: size of buffer pointed to by @ptr 619 * 620 * Return values: 621 * On success, returns size of object stored in @ptr 622 * %-EBADMSG on XDR buffer overflow 623 */ 624 static inline ssize_t 625 xdr_stream_decode_opaque_fixed(struct xdr_stream *xdr, void *ptr, size_t len) 626 { 627 __be32 *p = xdr_inline_decode(xdr, len); 628 629 if (unlikely(!p)) 630 return -EBADMSG; 631 xdr_decode_opaque_fixed(p, ptr, len); 632 return len; 633 } 634 635 /** 636 * xdr_stream_decode_opaque_inline - Decode variable length opaque xdr data 637 * @xdr: pointer to xdr_stream 638 * @ptr: location to store pointer to opaque data 639 * @maxlen: maximum acceptable object size 640 * 641 * Note: the pointer stored in @ptr cannot be assumed valid after the XDR 642 * buffer has been destroyed, or even after calling xdr_inline_decode() 643 * on @xdr. It is therefore expected that the object it points to should 644 * be processed immediately. 645 * 646 * Return values: 647 * On success, returns size of object stored in *@ptr 648 * %-EBADMSG on XDR buffer overflow 649 * %-EMSGSIZE if the size of the object would exceed @maxlen 650 */ 651 static inline ssize_t 652 xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxlen) 653 { 654 __be32 *p; 655 __u32 len; 656 657 *ptr = NULL; 658 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0)) 659 return -EBADMSG; 660 if (len != 0) { 661 p = xdr_inline_decode(xdr, len); 662 if (unlikely(!p)) 663 return -EBADMSG; 664 if (unlikely(len > maxlen)) 665 return -EMSGSIZE; 666 *ptr = p; 667 } 668 return len; 669 } 670 671 /** 672 * xdr_stream_decode_uint32_array - Decode variable length array of integers 673 * @xdr: pointer to xdr_stream 674 * @array: location to store the integer array or NULL 675 * @array_size: number of elements to store 676 * 677 * Return values: 678 * On success, returns number of elements stored in @array 679 * %-EBADMSG on XDR buffer overflow 680 * %-EMSGSIZE if the size of the array exceeds @array_size 681 */ 682 static inline ssize_t 683 xdr_stream_decode_uint32_array(struct xdr_stream *xdr, 684 __u32 *array, size_t array_size) 685 { 686 __be32 *p; 687 __u32 len; 688 ssize_t retval; 689 690 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0)) 691 return -EBADMSG; 692 p = xdr_inline_decode(xdr, len * sizeof(*p)); 693 if (unlikely(!p)) 694 return -EBADMSG; 695 if (array == NULL) 696 return len; 697 if (len <= array_size) { 698 if (len < array_size) 699 memset(array+len, 0, (array_size-len)*sizeof(*array)); 700 array_size = len; 701 retval = len; 702 } else 703 retval = -EMSGSIZE; 704 for (; array_size > 0; p++, array++, array_size--) 705 *array = be32_to_cpup(p); 706 return retval; 707 } 708 709 #endif /* _SUNRPC_XDR_H_ */ 710