ppp-deflate.c revision 1.18
1 /* $NetBSD: ppp-deflate.c,v 1.18 2008/11/25 02:40:36 cube Exp $ */ 2 /* Id: ppp-deflate.c,v 1.5 1997/03/04 03:33:28 paulus Exp */ 3 4 /* 5 * ppp_deflate.c - interface the zlib procedures for Deflate compression 6 * and decompression (as used by gzip) to the PPP code. 7 * This version is for use with mbufs on BSD-derived systems. 8 * 9 * Copyright (c) 1989-2002 Paul Mackerras. All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in 20 * the documentation and/or other materials provided with the 21 * distribution. 22 * 23 * 3. The name(s) of the authors of this software must not be used to 24 * endorse or promote products derived from this software without 25 * prior written permission. 26 * 27 * 4. Redistributions of any form whatsoever must retain the following 28 * acknowledgment: 29 * "This product includes software developed by Paul Mackerras 30 * <paulus (at) samba.org>". 31 * 32 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO 33 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 34 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY 35 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 36 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 37 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 38 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: ppp-deflate.c,v 1.18 2008/11/25 02:40:36 cube Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/mbuf.h> 47 #include <sys/module.h> 48 #include <net/if.h> 49 #include <net/ppp_defs.h> 50 #include <net/if_ppp.h> 51 #include <net/zlib.h> 52 53 #define PACKETPTR struct mbuf * 54 #include <net/ppp-comp.h> 55 56 #if DO_DEFLATE 57 58 #define DEFLATE_DEBUG 1 59 60 /* 61 * State for a Deflate (de)compressor. 62 */ 63 struct deflate_state { 64 int seqno; 65 int w_size; 66 int unit; 67 int hdrlen; 68 int mru; 69 int debug; 70 z_stream strm; 71 struct compstat stats; 72 }; 73 74 #define DEFLATE_OVHD 2 /* Deflate overhead/packet */ 75 76 static void *zalloc(void *, u_int items, u_int size); 77 static void zfree(void *, void *ptr); 78 static void *z_comp_alloc(u_char *options, int opt_len); 79 static void *z_decomp_alloc(u_char *options, int opt_len); 80 static void z_comp_free(void *state); 81 static void z_decomp_free(void *state); 82 static int z_comp_init(void *state, u_char *options, int opt_len, 83 int unit, int hdrlen, int debug); 84 static int z_decomp_init(void *state, u_char *options, int opt_len, 85 int unit, int hdrlen, int mru, int debug); 86 static int z_compress(void *state, struct mbuf **mret, 87 struct mbuf *mp, int slen, int maxolen); 88 static void z_incomp(void *state, struct mbuf *dmsg); 89 static int z_decompress(void *state, struct mbuf *cmp, 90 struct mbuf **dmpp); 91 static void z_comp_reset(void *state); 92 static void z_decomp_reset(void *state); 93 static void z_comp_stats(void *state, struct compstat *stats); 94 95 /* 96 * Procedures exported to if_ppp.c. 97 */ 98 static struct compressor ppp_deflate = { 99 .compress_proto = CI_DEFLATE, 100 .comp_alloc = z_comp_alloc, 101 .comp_free = z_comp_free, 102 .comp_init = z_comp_init, 103 .comp_reset = z_comp_reset, 104 .compress = z_compress, 105 .comp_stat = z_comp_stats, 106 .decomp_alloc = z_decomp_alloc, 107 .decomp_free = z_decomp_free, 108 .decomp_init = z_decomp_init, 109 .decomp_reset = z_decomp_reset, 110 .decompress = z_decompress, 111 .incomp = z_incomp, 112 .decomp_stat = z_comp_stats, 113 .comp_name = "ppp_deflate" 114 }; 115 116 static struct compressor ppp_deflate_draft = { 117 .compress_proto = CI_DEFLATE_DRAFT, 118 .comp_alloc = z_comp_alloc, 119 .comp_free = z_comp_free, 120 .comp_init = z_comp_init, 121 .comp_reset = z_comp_reset, 122 .compress = z_compress, 123 .comp_stat = z_comp_stats, 124 .decomp_alloc = z_decomp_alloc, 125 .decomp_free = z_decomp_free, 126 .decomp_init = z_decomp_init, 127 .decomp_reset = z_decomp_reset, 128 .decompress = z_decompress, 129 .incomp = z_incomp, 130 .decomp_stat = z_comp_stats, 131 .comp_name = "ppp_deflate" 132 }; 133 /* 134 * Space allocation and freeing routines for use by zlib routines. 135 */ 136 void * 137 zalloc(void *notused, u_int items, u_int size) 138 { 139 void *ptr; 140 141 ptr = malloc(items * size, M_DEVBUF, M_NOWAIT); 142 return ptr; 143 } 144 145 void 146 zfree(void *notused, void *ptr) 147 { 148 free(ptr, M_DEVBUF); 149 } 150 151 /* 152 * Allocate space for a compressor. 153 */ 154 static void * 155 z_comp_alloc(u_char *options, int opt_len) 156 { 157 struct deflate_state *state; 158 int w_size; 159 160 if (opt_len != CILEN_DEFLATE 161 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) 162 || options[1] != CILEN_DEFLATE 163 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL 164 || options[3] != DEFLATE_CHK_SEQUENCE) 165 return NULL; 166 w_size = DEFLATE_SIZE(options[2]); 167 if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE) 168 return NULL; 169 170 MALLOC(state, struct deflate_state *, sizeof(struct deflate_state), 171 M_DEVBUF, M_NOWAIT); 172 if (state == NULL) 173 return NULL; 174 175 state->strm.next_in = NULL; 176 state->strm.zalloc = zalloc; 177 state->strm.zfree = zfree; 178 if (deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION, DEFLATE_METHOD_VAL, 179 -w_size, 8, Z_DEFAULT_STRATEGY) != Z_OK) { 180 FREE(state, M_DEVBUF); 181 return NULL; 182 } 183 184 state->w_size = w_size; 185 memset(&state->stats, 0, sizeof(state->stats)); 186 return (void *) state; 187 } 188 189 static void 190 z_comp_free(void *arg) 191 { 192 struct deflate_state *state = (struct deflate_state *) arg; 193 194 deflateEnd(&state->strm); 195 FREE(state, M_DEVBUF); 196 } 197 198 static int 199 z_comp_init(void *arg, u_char *options, int opt_len, int unit, int hdrlen, 200 int debug) 201 { 202 struct deflate_state *state = (struct deflate_state *) arg; 203 204 if (opt_len < CILEN_DEFLATE 205 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) 206 || options[1] != CILEN_DEFLATE 207 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL 208 || DEFLATE_SIZE(options[2]) != state->w_size 209 || options[3] != DEFLATE_CHK_SEQUENCE) 210 return 0; 211 212 state->seqno = 0; 213 state->unit = unit; 214 state->hdrlen = hdrlen; 215 state->debug = debug; 216 217 deflateReset(&state->strm); 218 219 return 1; 220 } 221 222 static void 223 z_comp_reset(void *arg) 224 { 225 struct deflate_state *state = (struct deflate_state *) arg; 226 227 state->seqno = 0; 228 deflateReset(&state->strm); 229 } 230 231 int 232 z_compress(void *arg, 233 struct mbuf **mret /* compressed packet (out) */, 234 struct mbuf *mp /* uncompressed packet (in) */, 235 int orig_len, int maxolen) 236 { 237 struct deflate_state *state = (struct deflate_state *) arg; 238 u_char *rptr, *wptr; 239 int proto, olen, wspace, r, flush; 240 struct mbuf *m; 241 242 /* 243 * Check that the protocol is in the range we handle. 244 */ 245 rptr = mtod(mp, u_char *); 246 proto = PPP_PROTOCOL(rptr); 247 if (proto > 0x3fff || proto == 0xfd || proto == 0xfb) { 248 *mret = NULL; 249 return orig_len; 250 } 251 252 /* Allocate one mbuf initially. */ 253 if (maxolen > orig_len) 254 maxolen = orig_len; 255 MGET(m, M_DONTWAIT, MT_DATA); 256 *mret = m; 257 if (m != NULL) { 258 m->m_len = 0; 259 if (maxolen + state->hdrlen > MLEN) 260 MCLGET(m, M_DONTWAIT); 261 wspace = M_TRAILINGSPACE(m); 262 if (state->hdrlen + PPP_HDRLEN + 2 < wspace) { 263 m->m_data += state->hdrlen; 264 wspace -= state->hdrlen; 265 } 266 wptr = mtod(m, u_char *); 267 268 /* 269 * Copy over the PPP header and store the 2-byte sequence number. 270 */ 271 wptr[0] = PPP_ADDRESS(rptr); 272 wptr[1] = PPP_CONTROL(rptr); 273 wptr[2] = PPP_COMP >> 8; 274 wptr[3] = PPP_COMP; 275 wptr += PPP_HDRLEN; 276 wptr[0] = state->seqno >> 8; 277 wptr[1] = state->seqno; 278 wptr += 2; 279 state->strm.next_out = wptr; 280 state->strm.avail_out = wspace - (PPP_HDRLEN + 2); 281 } else { 282 state->strm.next_out = NULL; 283 state->strm.avail_out = 1000000; 284 wptr = NULL; 285 wspace = 0; 286 } 287 ++state->seqno; 288 289 rptr += (proto > 0xff)? 2: 3; /* skip 1st proto byte if 0 */ 290 state->strm.next_in = rptr; 291 state->strm.avail_in = mtod(mp, u_char *) + mp->m_len - rptr; 292 mp = mp->m_next; 293 flush = (mp == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH; 294 olen = 0; 295 for (;;) { 296 r = deflate(&state->strm, flush); 297 if (r != Z_OK) { 298 printf("z_compress: deflate returned %d (%s)\n", 299 r, (state->strm.msg? state->strm.msg: "")); 300 break; 301 } 302 if (flush != Z_NO_FLUSH && state->strm.avail_out != 0) 303 break; /* all done */ 304 if (state->strm.avail_in == 0 && mp != NULL) { 305 state->strm.next_in = mtod(mp, u_char *); 306 state->strm.avail_in = mp->m_len; 307 mp = mp->m_next; 308 if (mp == NULL) 309 flush = Z_PACKET_FLUSH; 310 } 311 if (state->strm.avail_out == 0) { 312 if (m != NULL) { 313 m->m_len = wspace; 314 olen += wspace; 315 MGET(m->m_next, M_DONTWAIT, MT_DATA); 316 m = m->m_next; 317 if (m != NULL) { 318 m->m_len = 0; 319 if (maxolen - olen > MLEN) 320 MCLGET(m, M_DONTWAIT); 321 state->strm.next_out = mtod(m, u_char *); 322 state->strm.avail_out = wspace = M_TRAILINGSPACE(m); 323 } 324 } 325 if (m == NULL) { 326 state->strm.next_out = NULL; 327 state->strm.avail_out = 1000000; 328 } 329 } 330 } 331 if (m != NULL) 332 olen += (m->m_len = wspace - state->strm.avail_out); 333 334 /* 335 * See if we managed to reduce the size of the packet. 336 */ 337 if (m != NULL && olen < orig_len) { 338 state->stats.comp_bytes += olen; 339 state->stats.comp_packets++; 340 } else { 341 if (*mret != NULL) { 342 m_freem(*mret); 343 *mret = NULL; 344 } 345 state->stats.inc_bytes += orig_len; 346 state->stats.inc_packets++; 347 olen = orig_len; 348 } 349 state->stats.unc_bytes += orig_len; 350 state->stats.unc_packets++; 351 352 return olen; 353 } 354 355 static void 356 z_comp_stats(void *arg, struct compstat *stats) 357 { 358 struct deflate_state *state = (struct deflate_state *) arg; 359 u_int out; 360 361 *stats = state->stats; 362 stats->ratio = stats->unc_bytes; 363 out = stats->comp_bytes + stats->inc_bytes; 364 if (stats->ratio <= 0x7ffffff) 365 stats->ratio <<= 8; 366 else 367 out >>= 8; 368 if (out != 0) 369 stats->ratio /= out; 370 } 371 372 /* 373 * Allocate space for a decompressor. 374 */ 375 static void * 376 z_decomp_alloc(u_char *options, int opt_len) 377 { 378 struct deflate_state *state; 379 int w_size; 380 381 if (opt_len != CILEN_DEFLATE 382 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) 383 || options[1] != CILEN_DEFLATE 384 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL 385 || options[3] != DEFLATE_CHK_SEQUENCE) 386 return NULL; 387 w_size = DEFLATE_SIZE(options[2]); 388 if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE) 389 return NULL; 390 391 MALLOC(state, struct deflate_state *, sizeof(struct deflate_state), 392 M_DEVBUF, M_NOWAIT); 393 if (state == NULL) 394 return NULL; 395 396 state->strm.next_out = NULL; 397 state->strm.zalloc = zalloc; 398 state->strm.zfree = zfree; 399 if (inflateInit2(&state->strm, -w_size) != Z_OK) { 400 FREE(state, M_DEVBUF); 401 return NULL; 402 } 403 404 state->w_size = w_size; 405 memset(&state->stats, 0, sizeof(state->stats)); 406 return (void *) state; 407 } 408 409 static void 410 z_decomp_free(void *arg) 411 { 412 struct deflate_state *state = (struct deflate_state *) arg; 413 414 inflateEnd(&state->strm); 415 FREE(state, M_DEVBUF); 416 } 417 418 static int 419 z_decomp_init(void *arg, u_char *options, int opt_len, int unit, int hdrlen, 420 int mru, int debug) 421 { 422 struct deflate_state *state = (struct deflate_state *) arg; 423 424 if (opt_len < CILEN_DEFLATE 425 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) 426 || options[1] != CILEN_DEFLATE 427 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL 428 || DEFLATE_SIZE(options[2]) != state->w_size 429 || options[3] != DEFLATE_CHK_SEQUENCE) 430 return 0; 431 432 state->seqno = 0; 433 state->unit = unit; 434 state->hdrlen = hdrlen; 435 state->debug = debug; 436 state->mru = mru; 437 438 inflateReset(&state->strm); 439 440 return 1; 441 } 442 443 static void 444 z_decomp_reset(void *arg) 445 { 446 struct deflate_state *state = (struct deflate_state *) arg; 447 448 state->seqno = 0; 449 inflateReset(&state->strm); 450 } 451 452 /* 453 * Decompress a Deflate-compressed packet. 454 * 455 * Because of patent problems, we return DECOMP_ERROR for errors 456 * found by inspecting the input data and for system problems, but 457 * DECOMP_FATALERROR for any errors which could possibly be said to 458 * be being detected "after" decompression. For DECOMP_ERROR, 459 * we can issue a CCP reset-request; for DECOMP_FATALERROR, we may be 460 * infringing a patent of Motorola's if we do, so we take CCP down 461 * instead. 462 * 463 * Given that the frame has the correct sequence number and a good FCS, 464 * errors such as invalid codes in the input most likely indicate a 465 * bug, so we return DECOMP_FATALERROR for them in order to turn off 466 * compression, even though they are detected by inspecting the input. 467 */ 468 int 469 z_decompress(void *arg, struct mbuf *mi, struct mbuf **mop) 470 { 471 struct deflate_state *state = (struct deflate_state *) arg; 472 struct mbuf *mo, *mo_head; 473 u_char *rptr, *wptr; 474 int rlen, olen, ospace; 475 int seq, i, flush, r, decode_proto; 476 u_char hdr[PPP_HDRLEN + DEFLATE_OVHD]; 477 478 *mop = NULL; 479 rptr = mtod(mi, u_char *); 480 rlen = mi->m_len; 481 for (i = 0; i < PPP_HDRLEN + DEFLATE_OVHD; ++i) { 482 while (rlen <= 0) { 483 mi = mi->m_next; 484 if (mi == NULL) 485 return DECOMP_ERROR; 486 rptr = mtod(mi, u_char *); 487 rlen = mi->m_len; 488 } 489 hdr[i] = *rptr++; 490 --rlen; 491 } 492 493 /* Check the sequence number. */ 494 seq = (hdr[PPP_HDRLEN] << 8) + hdr[PPP_HDRLEN+1]; 495 if (seq != state->seqno) { 496 if (state->debug) 497 printf("z_decompress%d: bad seq # %d, expected %d\n", 498 state->unit, seq, state->seqno); 499 return DECOMP_ERROR; 500 } 501 ++state->seqno; 502 503 /* Allocate an output mbuf. */ 504 MGETHDR(mo, M_DONTWAIT, MT_DATA); 505 if (mo == NULL) 506 return DECOMP_ERROR; 507 mo_head = mo; 508 mo->m_len = 0; 509 mo->m_next = NULL; 510 MCLGET(mo, M_DONTWAIT); 511 ospace = M_TRAILINGSPACE(mo); 512 if (state->hdrlen + PPP_HDRLEN < ospace) { 513 mo->m_data += state->hdrlen; 514 ospace -= state->hdrlen; 515 } 516 517 /* 518 * Fill in the first part of the PPP header. The protocol field 519 * comes from the decompressed data. 520 */ 521 wptr = mtod(mo, u_char *); 522 wptr[0] = PPP_ADDRESS(hdr); 523 wptr[1] = PPP_CONTROL(hdr); 524 wptr[2] = 0; 525 526 /* 527 * Set up to call inflate. We set avail_out to 1 initially so we can 528 * look at the first byte of the output and decide whether we have 529 * a 1-byte or 2-byte protocol field. 530 */ 531 state->strm.next_in = rptr; 532 state->strm.avail_in = rlen; 533 mi = mi->m_next; 534 flush = (mi == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH; 535 rlen += PPP_HDRLEN + DEFLATE_OVHD; 536 state->strm.next_out = wptr + 3; 537 state->strm.avail_out = 1; 538 decode_proto = 1; 539 olen = 0; 540 541 /* 542 * Call inflate, supplying more input or output as needed. 543 */ 544 for (;;) { 545 r = inflate(&state->strm, flush); 546 if (r != Z_OK) { 547 #if !DEFLATE_DEBUG 548 if (state->debug) 549 #endif 550 printf("z_decompress%d: inflate returned %d (%s)\n", 551 state->unit, r, (state->strm.msg? state->strm.msg: "")); 552 m_freem(mo_head); 553 return DECOMP_FATALERROR; 554 } 555 if (flush != Z_NO_FLUSH && state->strm.avail_out != 0) 556 break; /* all done */ 557 if (state->strm.avail_in == 0 && mi != NULL) { 558 state->strm.next_in = mtod(mi, u_char *); 559 state->strm.avail_in = mi->m_len; 560 rlen += mi->m_len; 561 mi = mi->m_next; 562 if (mi == NULL) 563 flush = Z_PACKET_FLUSH; 564 } 565 if (state->strm.avail_out == 0) { 566 if (decode_proto) { 567 state->strm.avail_out = ospace - PPP_HDRLEN; 568 if ((wptr[3] & 1) == 0) { 569 /* 2-byte protocol field */ 570 wptr[2] = wptr[3]; 571 --state->strm.next_out; 572 ++state->strm.avail_out; 573 --olen; 574 } 575 decode_proto = 0; 576 } else { 577 mo->m_len = ospace; 578 olen += ospace; 579 MGET(mo->m_next, M_DONTWAIT, MT_DATA); 580 mo = mo->m_next; 581 if (mo == NULL) { 582 m_freem(mo_head); 583 return DECOMP_ERROR; 584 } 585 MCLGET(mo, M_DONTWAIT); 586 state->strm.next_out = mtod(mo, u_char *); 587 state->strm.avail_out = ospace = M_TRAILINGSPACE(mo); 588 } 589 } 590 } 591 if (decode_proto) { 592 m_freem(mo_head); 593 return DECOMP_ERROR; 594 } 595 olen += (mo->m_len = ospace - state->strm.avail_out); 596 #if DEFLATE_DEBUG 597 if (olen > state->mru + PPP_HDRLEN) 598 printf("ppp_deflate%d: exceeded mru (%d > %d)\n", 599 state->unit, olen, state->mru + PPP_HDRLEN); 600 #endif 601 602 state->stats.unc_bytes += olen; 603 state->stats.unc_packets++; 604 state->stats.comp_bytes += rlen; 605 state->stats.comp_packets++; 606 607 *mop = mo_head; 608 return DECOMP_OK; 609 } 610 611 /* 612 * Incompressible data has arrived - add it to the history. 613 */ 614 static void 615 z_incomp(void *arg, struct mbuf *mi) 616 { 617 struct deflate_state *state = (struct deflate_state *) arg; 618 u_char *rptr; 619 int rlen, proto, r; 620 621 /* 622 * Check that the protocol is one we handle. 623 */ 624 rptr = mtod(mi, u_char *); 625 proto = PPP_PROTOCOL(rptr); 626 if (proto > 0x3fff || proto == 0xfd || proto == 0xfb) 627 return; 628 629 ++state->seqno; 630 631 /* 632 * Iterate through the mbufs, adding the characters in them 633 * to the decompressor's history. For the first mbuf, we start 634 * at the either the 1st or 2nd byte of the protocol field, 635 * depending on whether the protocol value is compressible. 636 */ 637 rlen = mi->m_len; 638 state->strm.next_in = rptr + 3; 639 state->strm.avail_in = rlen - 3; 640 if (proto > 0xff) { 641 --state->strm.next_in; 642 ++state->strm.avail_in; 643 } 644 for (;;) { 645 r = inflateIncomp(&state->strm); 646 if (r != Z_OK) { 647 /* gak! */ 648 #if !DEFLATE_DEBUG 649 if (state->debug) 650 #endif 651 printf("z_incomp%d: inflateIncomp returned %d (%s)\n", 652 state->unit, r, (state->strm.msg? state->strm.msg: "")); 653 return; 654 } 655 mi = mi->m_next; 656 if (mi == NULL) 657 break; 658 state->strm.next_in = mtod(mi, u_char *); 659 state->strm.avail_in = mi->m_len; 660 rlen += mi->m_len; 661 } 662 663 /* 664 * Update stats. 665 */ 666 state->stats.inc_bytes += rlen; 667 state->stats.inc_packets++; 668 state->stats.unc_bytes += rlen; 669 state->stats.unc_packets++; 670 } 671 672 MODULE(MODULE_CLASS_MISC, ppp_deflate, NULL); 673 674 static int 675 ppp_deflate_modcmd(modcmd_t cmd, void *arg) 676 { 677 int error, error1; 678 679 switch (cmd) { 680 case MODULE_CMD_INIT: 681 if ((error = ppp_register_compressor(&ppp_deflate)) != 0) 682 return error; 683 if ((error = 684 ppp_register_compressor(&ppp_deflate_draft)) != 0) 685 (void)ppp_unregister_compressor(&ppp_deflate); 686 return error; 687 case MODULE_CMD_FINI: 688 error = ppp_unregister_compressor(&ppp_deflate); 689 error1 = ppp_unregister_compressor(&ppp_deflate_draft); 690 if (error) 691 return error; 692 return error1; 693 case MODULE_CMD_STAT: 694 return 0; 695 default: 696 return ENOTTY; 697 } 698 699 return ENOTTY; 700 } 701 #endif /* DO_DEFLATE */ 702
Indexes created Tue Sep 30 20:09:53 GMT 2025