1 /*- 2 * Copyright (c) 2000, 2001 Boris Popov 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/sysctl.h> 36 #include <sys/endian.h> 37 #include <sys/errno.h> 38 #include <sys/malloc.h> 39 #include <sys/mbuf.h> 40 #include <sys/module.h> 41 #include <sys/uio.h> 42 43 #include <sys/mchain.h> 44 45 FEATURE(libmchain, "mchain library"); 46 47 MODULE_VERSION(libmchain, 1); 48 49 #define MBERROR(format, ...) printf("%s(%d): "format, __func__ , \ 50 __LINE__ , ## __VA_ARGS__) 51 52 #define MBPANIC(format, ...) printf("%s(%d): "format, __func__ , \ 53 __LINE__ , ## __VA_ARGS__) 54 55 /* 56 * Various helper functions 57 */ 58 int 59 mb_init(struct mbchain *mbp) 60 { 61 struct mbuf *m; 62 63 m = m_gethdr(M_WAITOK, MT_DATA); 64 m->m_len = 0; 65 mb_initm(mbp, m); 66 return (0); 67 } 68 69 void 70 mb_initm(struct mbchain *mbp, struct mbuf *m) 71 { 72 bzero(mbp, sizeof(*mbp)); 73 mbp->mb_top = mbp->mb_cur = m; 74 mbp->mb_mleft = M_TRAILINGSPACE(m); 75 } 76 77 void 78 mb_done(struct mbchain *mbp) 79 { 80 if (mbp->mb_top) { 81 m_freem(mbp->mb_top); 82 mbp->mb_top = NULL; 83 } 84 } 85 86 struct mbuf * 87 mb_detach(struct mbchain *mbp) 88 { 89 struct mbuf *m; 90 91 m = mbp->mb_top; 92 mbp->mb_top = NULL; 93 return (m); 94 } 95 96 int 97 mb_fixhdr(struct mbchain *mbp) 98 { 99 return (mbp->mb_top->m_pkthdr.len = m_fixhdr(mbp->mb_top)); 100 } 101 102 /* 103 * Check if object of size 'size' fit to the current position and 104 * allocate new mbuf if not. Advance pointers and increase length of mbuf(s). 105 * Return pointer to the object placeholder or NULL if any error occurred. 106 * Note: size should be <= MLEN 107 */ 108 caddr_t 109 mb_reserve(struct mbchain *mbp, int size) 110 { 111 struct mbuf *m, *mn; 112 caddr_t bpos; 113 114 if (size > MLEN) 115 panic("mb_reserve: size = %d\n", size); 116 m = mbp->mb_cur; 117 if (mbp->mb_mleft < size) { 118 mn = m_get(M_WAITOK, MT_DATA); 119 mbp->mb_cur = m->m_next = mn; 120 m = mn; 121 m->m_len = 0; 122 mbp->mb_mleft = M_TRAILINGSPACE(m); 123 } 124 mbp->mb_mleft -= size; 125 mbp->mb_count += size; 126 bpos = mtod(m, caddr_t) + m->m_len; 127 m->m_len += size; 128 return (bpos); 129 } 130 131 int 132 mb_put_padbyte(struct mbchain *mbp) 133 { 134 caddr_t dst; 135 uint8_t x = 0; 136 137 dst = mtod(mbp->mb_cur, caddr_t) + mbp->mb_cur->m_len; 138 139 /* Only add padding if address is odd */ 140 if ((unsigned long)dst & 1) 141 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM)); 142 else 143 return (0); 144 } 145 146 int 147 mb_put_uint8(struct mbchain *mbp, uint8_t x) 148 { 149 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM)); 150 } 151 152 int 153 mb_put_uint16be(struct mbchain *mbp, uint16_t x) 154 { 155 x = htobe16(x); 156 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM)); 157 } 158 159 int 160 mb_put_uint16le(struct mbchain *mbp, uint16_t x) 161 { 162 x = htole16(x); 163 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM)); 164 } 165 166 int 167 mb_put_uint32be(struct mbchain *mbp, uint32_t x) 168 { 169 x = htobe32(x); 170 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM)); 171 } 172 173 int 174 mb_put_uint32le(struct mbchain *mbp, uint32_t x) 175 { 176 x = htole32(x); 177 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM)); 178 } 179 180 int 181 mb_put_int64be(struct mbchain *mbp, int64_t x) 182 { 183 x = htobe64(x); 184 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM)); 185 } 186 187 int 188 mb_put_int64le(struct mbchain *mbp, int64_t x) 189 { 190 x = htole64(x); 191 return (mb_put_mem(mbp, (caddr_t)&x, sizeof(x), MB_MSYSTEM)); 192 } 193 194 int 195 mb_put_mem(struct mbchain *mbp, c_caddr_t source, int size, int type) 196 { 197 struct mbuf *m; 198 caddr_t dst; 199 c_caddr_t src; 200 int cplen, error, mleft, count; 201 size_t srclen, dstlen; 202 203 m = mbp->mb_cur; 204 mleft = mbp->mb_mleft; 205 206 while (size > 0) { 207 if (mleft == 0) { 208 if (m->m_next == NULL) 209 m = m_getm(m, size, M_WAITOK, MT_DATA); 210 else 211 m = m->m_next; 212 mleft = M_TRAILINGSPACE(m); 213 continue; 214 } 215 cplen = mleft > size ? size : mleft; 216 srclen = dstlen = cplen; 217 dst = mtod(m, caddr_t) + m->m_len; 218 switch (type) { 219 case MB_MCUSTOM: 220 srclen = size; 221 dstlen = mleft; 222 error = mbp->mb_copy(mbp, source, dst, &srclen, &dstlen); 223 if (error) 224 return (error); 225 break; 226 case MB_MINLINE: 227 for (src = source, count = cplen; count; count--) 228 *dst++ = *src++; 229 break; 230 case MB_MSYSTEM: 231 bcopy(source, dst, cplen); 232 break; 233 case MB_MUSER: 234 error = copyin(source, dst, cplen); 235 if (error) 236 return (error); 237 break; 238 case MB_MZERO: 239 bzero(dst, cplen); 240 break; 241 } 242 size -= srclen; 243 source += srclen; 244 m->m_len += dstlen; 245 mleft -= dstlen; 246 mbp->mb_count += dstlen; 247 } 248 mbp->mb_cur = m; 249 mbp->mb_mleft = mleft; 250 return (0); 251 } 252 253 int 254 mb_put_mbuf(struct mbchain *mbp, struct mbuf *m) 255 { 256 mbp->mb_cur->m_next = m; 257 while (m) { 258 mbp->mb_count += m->m_len; 259 if (m->m_next == NULL) 260 break; 261 m = m->m_next; 262 } 263 mbp->mb_mleft = M_TRAILINGSPACE(m); 264 mbp->mb_cur = m; 265 return (0); 266 } 267 268 /* 269 * copies a uio scatter/gather list to an mbuf chain. 270 */ 271 int 272 mb_put_uio(struct mbchain *mbp, struct uio *uiop, int size) 273 { 274 long left; 275 int mtype, error; 276 277 mtype = (uiop->uio_segflg == UIO_SYSSPACE) ? MB_MSYSTEM : MB_MUSER; 278 279 while (size > 0 && uiop->uio_resid) { 280 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL) 281 return (EFBIG); 282 left = uiop->uio_iov->iov_len; 283 if (left == 0) { 284 uiop->uio_iov++; 285 uiop->uio_iovcnt--; 286 continue; 287 } 288 if (left > size) 289 left = size; 290 error = mb_put_mem(mbp, uiop->uio_iov->iov_base, left, mtype); 291 if (error) 292 return (error); 293 uiop->uio_offset += left; 294 uiop->uio_resid -= left; 295 uiop->uio_iov->iov_base = 296 (char *)uiop->uio_iov->iov_base + left; 297 uiop->uio_iov->iov_len -= left; 298 size -= left; 299 } 300 return (0); 301 } 302 303 /* 304 * Routines for fetching data from an mbuf chain 305 */ 306 int 307 md_init(struct mdchain *mdp) 308 { 309 struct mbuf *m; 310 311 m = m_gethdr(M_WAITOK, MT_DATA); 312 m->m_len = 0; 313 md_initm(mdp, m); 314 return (0); 315 } 316 317 void 318 md_initm(struct mdchain *mdp, struct mbuf *m) 319 { 320 bzero(mdp, sizeof(*mdp)); 321 mdp->md_top = mdp->md_cur = m; 322 mdp->md_pos = mtod(m, u_char*); 323 } 324 325 void 326 md_done(struct mdchain *mdp) 327 { 328 if (mdp->md_top) { 329 m_freem(mdp->md_top); 330 mdp->md_top = NULL; 331 } 332 } 333 334 /* 335 * Append a separate mbuf chain. It is caller responsibility to prevent 336 * multiple calls to fetch/record routines. 337 */ 338 void 339 md_append_record(struct mdchain *mdp, struct mbuf *top) 340 { 341 struct mbuf *m; 342 343 if (mdp->md_top == NULL) { 344 md_initm(mdp, top); 345 return; 346 } 347 m = mdp->md_top; 348 while (m->m_nextpkt) 349 m = m->m_nextpkt; 350 m->m_nextpkt = top; 351 top->m_nextpkt = NULL; 352 return; 353 } 354 355 /* 356 * Put next record in place of existing 357 */ 358 int 359 md_next_record(struct mdchain *mdp) 360 { 361 struct mbuf *m; 362 363 if (mdp->md_top == NULL) 364 return (ENOENT); 365 m = mdp->md_top->m_nextpkt; 366 md_done(mdp); 367 if (m == NULL) 368 return (ENOENT); 369 md_initm(mdp, m); 370 return (0); 371 } 372 373 int 374 md_get_uint8(struct mdchain *mdp, uint8_t *x) 375 { 376 return (md_get_mem(mdp, x, 1, MB_MINLINE)); 377 } 378 379 int 380 md_get_uint16(struct mdchain *mdp, uint16_t *x) 381 { 382 return (md_get_mem(mdp, (caddr_t)x, 2, MB_MINLINE)); 383 } 384 385 int 386 md_get_uint16le(struct mdchain *mdp, uint16_t *x) 387 { 388 uint16_t v; 389 int error = md_get_uint16(mdp, &v); 390 391 if (x != NULL) 392 *x = le16toh(v); 393 return (error); 394 } 395 396 int 397 md_get_uint16be(struct mdchain *mdp, uint16_t *x) 398 { 399 uint16_t v; 400 int error = md_get_uint16(mdp, &v); 401 402 if (x != NULL) 403 *x = be16toh(v); 404 return (error); 405 } 406 407 int 408 md_get_uint32(struct mdchain *mdp, uint32_t *x) 409 { 410 return (md_get_mem(mdp, (caddr_t)x, 4, MB_MINLINE)); 411 } 412 413 int 414 md_get_uint32be(struct mdchain *mdp, uint32_t *x) 415 { 416 uint32_t v; 417 int error; 418 419 error = md_get_uint32(mdp, &v); 420 if (x != NULL) 421 *x = be32toh(v); 422 return (error); 423 } 424 425 int 426 md_get_uint32le(struct mdchain *mdp, uint32_t *x) 427 { 428 uint32_t v; 429 int error; 430 431 error = md_get_uint32(mdp, &v); 432 if (x != NULL) 433 *x = le32toh(v); 434 return (error); 435 } 436 437 int 438 md_get_int64(struct mdchain *mdp, int64_t *x) 439 { 440 return (md_get_mem(mdp, (caddr_t)x, 8, MB_MINLINE)); 441 } 442 443 int 444 md_get_int64be(struct mdchain *mdp, int64_t *x) 445 { 446 int64_t v; 447 int error; 448 449 error = md_get_int64(mdp, &v); 450 if (x != NULL) 451 *x = be64toh(v); 452 return (error); 453 } 454 455 int 456 md_get_int64le(struct mdchain *mdp, int64_t *x) 457 { 458 int64_t v; 459 int error; 460 461 error = md_get_int64(mdp, &v); 462 if (x != NULL) 463 *x = le64toh(v); 464 return (error); 465 } 466 467 int 468 md_get_mem(struct mdchain *mdp, caddr_t target, int size, int type) 469 { 470 struct mbuf *m = mdp->md_cur; 471 int error; 472 u_int count; 473 u_char *s; 474 475 while (size > 0) { 476 if (m == NULL) { 477 MBERROR("incomplete copy\n"); 478 return (EBADRPC); 479 } 480 s = mdp->md_pos; 481 count = mtod(m, u_char*) + m->m_len - s; 482 if (count == 0) { 483 mdp->md_cur = m = m->m_next; 484 if (m) 485 s = mdp->md_pos = mtod(m, caddr_t); 486 continue; 487 } 488 if (count > size) 489 count = size; 490 size -= count; 491 mdp->md_pos += count; 492 if (target == NULL) 493 continue; 494 switch (type) { 495 case MB_MUSER: 496 error = copyout(s, target, count); 497 if (error) 498 return error; 499 break; 500 case MB_MSYSTEM: 501 bcopy(s, target, count); 502 break; 503 case MB_MINLINE: 504 while (count--) 505 *target++ = *s++; 506 continue; 507 } 508 target += count; 509 } 510 return (0); 511 } 512 513 int 514 md_get_mbuf(struct mdchain *mdp, int size, struct mbuf **ret) 515 { 516 struct mbuf *m = mdp->md_cur, *rm; 517 518 rm = m_copym(m, mdp->md_pos - mtod(m, u_char*), size, M_WAITOK); 519 md_get_mem(mdp, NULL, size, MB_MZERO); 520 *ret = rm; 521 return (0); 522 } 523 524 int 525 md_get_uio(struct mdchain *mdp, struct uio *uiop, int size) 526 { 527 char *uiocp; 528 long left; 529 int mtype, error; 530 531 mtype = (uiop->uio_segflg == UIO_SYSSPACE) ? MB_MSYSTEM : MB_MUSER; 532 while (size > 0 && uiop->uio_resid) { 533 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL) 534 return (EFBIG); 535 left = uiop->uio_iov->iov_len; 536 if (left == 0) { 537 uiop->uio_iov++; 538 uiop->uio_iovcnt--; 539 continue; 540 } 541 uiocp = uiop->uio_iov->iov_base; 542 if (left > size) 543 left = size; 544 error = md_get_mem(mdp, uiocp, left, mtype); 545 if (error) 546 return (error); 547 uiop->uio_offset += left; 548 uiop->uio_resid -= left; 549 uiop->uio_iov->iov_base = 550 (char *)uiop->uio_iov->iov_base + left; 551 uiop->uio_iov->iov_len -= left; 552 size -= left; 553 } 554 return (0); 555 } 556