2 * ccp.c - PPP Compression Control Protocol.
4 * Copyright (c) 1994-2002 Paul Mackerras. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. The name(s) of the authors of this software must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission.
22 * 4. Redistributions of any form whatsoever must retain the following
24 * "This product includes software developed by Paul Mackerras
25 * <paulus@samba.org>".
27 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
28 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
29 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
30 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
31 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
32 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
33 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
36 #define RCSID "$Id: ccp.c,v 1.45 2003/04/25 09:41:58 fcusack Exp $"
44 #include <net/ppp-comp.h>
47 #include "chap_ms.h" /* mppe_xxxx_key, mppe_keys_set */
48 #include "lcp.h" /* lcp_close(), lcp_fsm */
51 static const char rcsid[] = RCSID;
54 * Unfortunately there is a bug in zlib which means that using a
55 * size of 8 (window size = 256) for Deflate compression will cause
56 * buffer overruns and kernel crashes in the deflate module.
57 * Until this is fixed we only accept sizes in the range 9 .. 15.
58 * Thanks to James Carlson for pointing this out.
60 #define DEFLATE_MIN_WORKS 9
63 * Command-line options.
65 static int setbsdcomp __P((char **));
66 static int setdeflate __P((char **));
67 static char bsd_value[8];
68 static char deflate_value[8];
74 bool refuse_mppe_stateful = 1; /* Allow stateful mode? */
77 static option_t ccp_option_list[] = {
78 { "noccp", o_bool, &ccp_protent.enabled_flag,
79 "Disable CCP negotiation" },
80 { "-ccp", o_bool, &ccp_protent.enabled_flag,
81 "Disable CCP negotiation", OPT_ALIAS },
83 { "bsdcomp", o_special, (void *)setbsdcomp,
84 "Request BSD-Compress packet compression",
85 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value },
86 { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
87 "don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR,
88 &ccp_allowoptions[0].bsd_compress },
89 { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
90 "don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
91 &ccp_allowoptions[0].bsd_compress },
93 { "deflate", o_special, (void *)setdeflate,
94 "request Deflate compression",
95 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value },
96 { "nodeflate", o_bool, &ccp_wantoptions[0].deflate,
97 "don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR,
98 &ccp_allowoptions[0].deflate },
99 { "-deflate", o_bool, &ccp_wantoptions[0].deflate,
100 "don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
101 &ccp_allowoptions[0].deflate },
103 { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft,
104 "don't use draft deflate #", OPT_A2COPY,
105 &ccp_allowoptions[0].deflate_draft },
107 { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
108 "request Predictor-1", OPT_PRIO | 1 },
109 { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1,
110 "don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR,
111 &ccp_allowoptions[0].predictor_1 },
112 { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
113 "don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
114 &ccp_allowoptions[0].predictor_1 },
117 /* MPPE options are symmetrical ... we only set wantoptions here */
118 { "require-mppe", o_bool, &ccp_wantoptions[0].mppe,
119 "require MPPE encryption",
120 OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
121 { "+mppe", o_bool, &ccp_wantoptions[0].mppe,
122 "require MPPE encryption",
123 OPT_ALIAS | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
124 { "nomppe", o_bool, &ccp_wantoptions[0].mppe,
125 "don't allow MPPE encryption", OPT_PRIO },
126 { "-mppe", o_bool, &ccp_wantoptions[0].mppe,
127 "don't allow MPPE encryption", OPT_ALIAS | OPT_PRIO },
129 /* We use ccp_allowoptions[0].mppe as a junk var ... it is reset later */
130 { "require-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
131 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
132 &ccp_wantoptions[0].mppe },
133 { "+mppe-40", o_bool, &ccp_allowoptions[0].mppe,
134 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
135 &ccp_wantoptions[0].mppe },
136 { "nomppe-40", o_bool, &ccp_allowoptions[0].mppe,
137 "don't allow MPPE 40-bit encryption",
138 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40, &ccp_wantoptions[0].mppe },
139 { "-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
140 "don't allow MPPE 40-bit encryption",
141 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40,
142 &ccp_wantoptions[0].mppe },
144 { "require-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
145 "require MPPE 128-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
146 &ccp_wantoptions[0].mppe },
147 { "+mppe-128", o_bool, &ccp_allowoptions[0].mppe,
148 "require MPPE 128-bit encryption",
149 OPT_ALIAS | OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
150 &ccp_wantoptions[0].mppe },
151 { "nomppe-128", o_bool, &ccp_allowoptions[0].mppe,
152 "don't allow MPPE 128-bit encryption",
153 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128, &ccp_wantoptions[0].mppe },
154 { "-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
155 "don't allow MPPE 128-bit encryption",
156 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128,
157 &ccp_wantoptions[0].mppe },
159 /* strange one; we always request stateless, but will we allow stateful? */
160 { "mppe-stateful", o_bool, &refuse_mppe_stateful,
161 "allow MPPE stateful mode", OPT_PRIO },
162 { "nomppe-stateful", o_bool, &refuse_mppe_stateful,
163 "disallow MPPE stateful mode", OPT_PRIO | 1 },
170 * Protocol entry points from main code.
172 static void ccp_init __P((int unit));
173 static void ccp_open __P((int unit));
174 static void ccp_close __P((int unit, char *));
175 static void ccp_lowerup __P((int unit));
176 static void ccp_lowerdown __P((int));
177 static void ccp_input __P((int unit, u_char *pkt, int len));
178 static void ccp_protrej __P((int unit));
179 static int ccp_printpkt __P((u_char *pkt, int len,
180 void (*printer) __P((void *, char *, ...)),
182 static void ccp_datainput __P((int unit, u_char *pkt, int len));
184 struct protent ccp_protent = {
204 fsm ccp_fsm[NUM_PPP];
205 ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */
206 ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */
207 ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */
208 ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */
211 * Callbacks for fsm code.
213 static void ccp_resetci __P((fsm *));
214 static int ccp_cilen __P((fsm *));
215 static void ccp_addci __P((fsm *, u_char *, int *));
216 static int ccp_ackci __P((fsm *, u_char *, int));
217 static int ccp_nakci __P((fsm *, u_char *, int));
218 static int ccp_rejci __P((fsm *, u_char *, int));
219 static int ccp_reqci __P((fsm *, u_char *, int *, int));
220 static void ccp_up __P((fsm *));
221 static void ccp_down __P((fsm *));
222 static int ccp_extcode __P((fsm *, int, int, u_char *, int));
223 static void ccp_rack_timeout __P((void *));
224 static char *method_name __P((ccp_options *, ccp_options *));
226 static fsm_callbacks ccp_callbacks = {
245 * Do we want / did we get any compression?
247 #define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \
248 || (opt).predictor_1 || (opt).predictor_2 \
252 * Local state (mainly for handling reset-reqs and reset-acks).
254 static int ccp_localstate[NUM_PPP];
255 #define RACK_PENDING 1 /* waiting for reset-ack */
256 #define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
258 #define RACKTIMEOUT 1 /* second */
260 static int all_rejected[NUM_PPP]; /* we rejected all peer's options */
273 abits = rbits = strtol(str, &endp, 0);
274 if (endp != str && *endp == ',') {
276 abits = strtol(str, &endp, 0);
278 if (*endp != 0 || endp == str) {
279 option_error("invalid parameter '%s' for bsdcomp option", *argv);
282 if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS))
283 || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) {
284 option_error("bsdcomp option values must be 0 or %d .. %d",
285 BSD_MIN_BITS, BSD_MAX_BITS);
289 ccp_wantoptions[0].bsd_compress = 1;
290 ccp_wantoptions[0].bsd_bits = rbits;
292 ccp_wantoptions[0].bsd_compress = 0;
294 ccp_allowoptions[0].bsd_compress = 1;
295 ccp_allowoptions[0].bsd_bits = abits;
297 ccp_allowoptions[0].bsd_compress = 0;
298 slprintf(bsd_value, sizeof(bsd_value),
299 rbits == abits? "%d": "%d,%d", rbits, abits);
312 abits = rbits = strtol(str, &endp, 0);
313 if (endp != str && *endp == ',') {
315 abits = strtol(str, &endp, 0);
317 if (*endp != 0 || endp == str) {
318 option_error("invalid parameter '%s' for deflate option", *argv);
321 if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE))
322 || (abits != 0 && (abits < DEFLATE_MIN_SIZE
323 || abits > DEFLATE_MAX_SIZE))) {
324 option_error("deflate option values must be 0 or %d .. %d",
325 DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE);
328 if (rbits == DEFLATE_MIN_SIZE || abits == DEFLATE_MIN_SIZE) {
329 if (rbits == DEFLATE_MIN_SIZE)
330 rbits = DEFLATE_MIN_WORKS;
331 if (abits == DEFLATE_MIN_SIZE)
332 abits = DEFLATE_MIN_WORKS;
333 warn("deflate option value of %d changed to %d to avoid zlib bug",
334 DEFLATE_MIN_SIZE, DEFLATE_MIN_WORKS);
337 ccp_wantoptions[0].deflate = 1;
338 ccp_wantoptions[0].deflate_size = rbits;
340 ccp_wantoptions[0].deflate = 0;
342 ccp_allowoptions[0].deflate = 1;
343 ccp_allowoptions[0].deflate_size = abits;
345 ccp_allowoptions[0].deflate = 0;
346 slprintf(deflate_value, sizeof(deflate_value),
347 rbits == abits? "%d": "%d,%d", rbits, abits);
353 * ccp_init - initialize CCP.
359 fsm *f = &ccp_fsm[unit];
362 f->protocol = PPP_CCP;
363 f->callbacks = &ccp_callbacks;
366 memset(&ccp_wantoptions[unit], 0, sizeof(ccp_options));
367 memset(&ccp_gotoptions[unit], 0, sizeof(ccp_options));
368 memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
369 memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
371 ccp_wantoptions[0].deflate = 1;
372 ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE;
373 ccp_wantoptions[0].deflate_correct = 1;
374 ccp_wantoptions[0].deflate_draft = 1;
375 ccp_allowoptions[0].deflate = 1;
376 ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE;
377 ccp_allowoptions[0].deflate_correct = 1;
378 ccp_allowoptions[0].deflate_draft = 1;
380 ccp_wantoptions[0].bsd_compress = 1;
381 ccp_wantoptions[0].bsd_bits = BSD_MAX_BITS;
382 ccp_allowoptions[0].bsd_compress = 1;
383 ccp_allowoptions[0].bsd_bits = BSD_MAX_BITS;
385 ccp_allowoptions[0].predictor_1 = 1;
389 * ccp_open - CCP is allowed to come up.
395 fsm *f = &ccp_fsm[unit];
397 if (f->state != OPENED)
398 ccp_flags_set(unit, 1, 0);
401 * Find out which compressors the kernel supports before
402 * deciding whether to open in silent mode.
405 if (!ANY_COMPRESS(ccp_gotoptions[unit]))
406 f->flags |= OPT_SILENT;
412 * ccp_close - Terminate CCP.
415 ccp_close(unit, reason)
419 ccp_flags_set(unit, 0, 0);
420 fsm_close(&ccp_fsm[unit], reason);
424 * ccp_lowerup - we may now transmit CCP packets.
430 fsm_lowerup(&ccp_fsm[unit]);
434 * ccp_lowerdown - we may not transmit CCP packets.
440 fsm_lowerdown(&ccp_fsm[unit]);
444 * ccp_input - process a received CCP packet.
447 ccp_input(unit, p, len)
452 fsm *f = &ccp_fsm[unit];
456 * Check for a terminate-request so we can print a message.
459 fsm_input(f, p, len);
460 if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED) {
461 notice("Compression disabled by peer.");
463 if (ccp_gotoptions[unit].mppe) {
464 error("MPPE disabled, closing LCP");
465 lcp_close(unit, "MPPE disabled by peer");
471 * If we get a terminate-ack and we're not asking for compression,
474 if (oldstate == REQSENT && p[0] == TERMACK
475 && !ANY_COMPRESS(ccp_gotoptions[unit]))
476 ccp_close(unit, "No compression negotiated");
480 * Handle a CCP-specific code.
483 ccp_extcode(f, code, id, p, len)
491 if (f->state != OPENED)
493 /* send a reset-ack, which the transmitter will see and
494 reset its compression state. */
495 fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
499 if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) {
500 ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT);
501 UNTIMEOUT(ccp_rack_timeout, f);
513 * ccp_protrej - peer doesn't talk CCP.
519 ccp_flags_set(unit, 0, 0);
520 fsm_lowerdown(&ccp_fsm[unit]);
523 if (ccp_gotoptions[unit].mppe) {
524 error("MPPE required but peer negotiation failed");
525 lcp_close(unit, "MPPE required but peer negotiation failed");
532 * ccp_resetci - initialize at start of negotiation.
538 ccp_options *go = &ccp_gotoptions[f->unit];
539 u_char opt_buf[CCP_MAX_OPTION_LENGTH];
541 *go = ccp_wantoptions[f->unit];
542 all_rejected[f->unit] = 0;
546 ccp_options *ao = &ccp_allowoptions[f->unit];
547 int auth_mschap_bits = auth_done[f->unit];
551 * Start with a basic sanity check: mschap[v2] auth must be in
552 * exactly one direction. RFC 3079 says that the keys are
553 * 'derived from the credentials of the peer that initiated the call',
554 * however the PPP protocol doesn't have such a concept, and pppd
555 * cannot get this info externally. Instead we do the best we can.
556 * NB: If MPPE is required, all other compression opts are invalid.
557 * So, we return right away if we can't do it.
560 /* Leave only the mschap auth bits set */
561 auth_mschap_bits &= (CHAP_MS_WITHPEER | CHAP_MS_PEER |
562 CHAP_MS2_WITHPEER | CHAP_MS2_PEER);
563 /* Count the mschap auths */
564 auth_mschap_bits >>= CHAP_MS_SHIFT;
567 numbits += auth_mschap_bits & 1;
568 auth_mschap_bits >>= 1;
569 } while (auth_mschap_bits);
571 error("MPPE required, but auth done in both directions.");
572 lcp_close(f->unit, "MPPE required but not available");
576 error("MPPE required, but MS-CHAP[v2] auth not performed.");
577 lcp_close(f->unit, "MPPE required but not available");
581 /* A plugin (eg radius) may not have obtained key material. */
582 if (!mppe_keys_set) {
583 error("MPPE required, but keys are not available. "
584 "Possible plugin problem?");
585 lcp_close(f->unit, "MPPE required but not available");
589 /* LM auth not supported for MPPE */
590 if (auth_done[f->unit] & (CHAP_MS_WITHPEER | CHAP_MS_PEER)) {
591 /* This might be noise */
592 if (go->mppe & MPPE_OPT_40) {
593 notice("Disabling 40-bit MPPE; MS-CHAP LM not supported");
594 go->mppe &= ~MPPE_OPT_40;
595 ccp_wantoptions[f->unit].mppe &= ~MPPE_OPT_40;
599 /* Last check: can we actually negotiate something? */
600 if (!(go->mppe & (MPPE_OPT_40 | MPPE_OPT_128))) {
601 /* Could be misconfig, could be 40-bit disabled above. */
602 error("MPPE required, but both 40-bit and 128-bit disabled.");
603 lcp_close(f->unit, "MPPE required but not available");
609 /* MPPE is not compatible with other compression types */
610 ao->bsd_compress = go->bsd_compress = 0;
611 ao->predictor_1 = go->predictor_1 = 0;
612 ao->predictor_2 = go->predictor_2 = 0;
613 ao->deflate = go->deflate = 0;
618 * Check whether the kernel knows about the various
619 * compression methods we might request.
623 opt_buf[0] = CI_MPPE;
624 opt_buf[1] = CILEN_MPPE;
625 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
626 /* Key material unimportant here. */
627 if (ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0) <= 0) {
628 error("MPPE required, but kernel has no support.");
629 lcp_close(f->unit, "MPPE required but not available");
633 if (go->bsd_compress) {
634 opt_buf[0] = CI_BSD_COMPRESS;
635 opt_buf[1] = CILEN_BSD_COMPRESS;
636 opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS);
637 if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0)
638 go->bsd_compress = 0;
641 if (go->deflate_correct) {
642 opt_buf[0] = CI_DEFLATE;
643 opt_buf[1] = CILEN_DEFLATE;
644 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
645 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
646 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
647 go->deflate_correct = 0;
649 if (go->deflate_draft) {
650 opt_buf[0] = CI_DEFLATE_DRAFT;
651 opt_buf[1] = CILEN_DEFLATE;
652 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
653 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
654 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
655 go->deflate_draft = 0;
657 if (!go->deflate_correct && !go->deflate_draft)
660 if (go->predictor_1) {
661 opt_buf[0] = CI_PREDICTOR_1;
662 opt_buf[1] = CILEN_PREDICTOR_1;
663 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
666 if (go->predictor_2) {
667 opt_buf[0] = CI_PREDICTOR_2;
668 opt_buf[1] = CILEN_PREDICTOR_2;
669 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
675 * ccp_cilen - Return total length of our configuration info.
681 ccp_options *go = &ccp_gotoptions[f->unit];
683 return (go->bsd_compress? CILEN_BSD_COMPRESS: 0)
684 + (go->deflate? CILEN_DEFLATE: 0)
685 + (go->predictor_1? CILEN_PREDICTOR_1: 0)
686 + (go->predictor_2? CILEN_PREDICTOR_2: 0)
687 + (go->mppe? CILEN_MPPE: 0);
691 * ccp_addci - put our requests in a packet.
694 ccp_addci(f, p, lenp)
700 ccp_options *go = &ccp_gotoptions[f->unit];
704 * Add the compression types that we can receive, in decreasing
705 * preference order. Get the kernel to allocate the first one
706 * in case it gets Acked.
710 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
712 p[0] = opt_buf[0] = CI_MPPE;
713 p[1] = opt_buf[1] = CILEN_MPPE;
714 MPPE_OPTS_TO_CI(go->mppe, &p[2]);
715 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
716 BCOPY(mppe_recv_key, &opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
717 res = ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0);
721 /* This shouldn't happen, we've already tested it! */
722 lcp_close(f->unit, "MPPE required but not available in kernel");
726 p[0] = go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT;
727 p[1] = CILEN_DEFLATE;
728 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
729 p[3] = DEFLATE_CHK_SEQUENCE;
731 if (go->deflate_size < DEFLATE_MIN_WORKS) {
735 res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
739 } else if (res < 0) {
744 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
746 if (p != p0 && go->deflate_correct && go->deflate_draft) {
747 p[0] = CI_DEFLATE_DRAFT;
748 p[1] = CILEN_DEFLATE;
749 p[2] = p[2 - CILEN_DEFLATE];
750 p[3] = DEFLATE_CHK_SEQUENCE;
754 if (go->bsd_compress) {
755 p[0] = CI_BSD_COMPRESS;
756 p[1] = CILEN_BSD_COMPRESS;
757 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
759 p += CILEN_BSD_COMPRESS; /* not the first option */
762 if (go->bsd_bits < BSD_MIN_BITS) {
763 go->bsd_compress = 0;
766 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0);
768 p += CILEN_BSD_COMPRESS;
770 } else if (res < 0) {
771 go->bsd_compress = 0;
775 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
779 /* XXX Should Predictor 2 be preferable to Predictor 1? */
780 if (go->predictor_1) {
781 p[0] = CI_PREDICTOR_1;
782 p[1] = CILEN_PREDICTOR_1;
783 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) {
786 p += CILEN_PREDICTOR_1;
789 if (go->predictor_2) {
790 p[0] = CI_PREDICTOR_2;
791 p[1] = CILEN_PREDICTOR_2;
792 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) {
795 p += CILEN_PREDICTOR_2;
799 go->method = (p > p0)? p0[0]: -1;
805 * ccp_ackci - process a received configure-ack, and return
806 * 1 iff the packet was OK.
814 ccp_options *go = &ccp_gotoptions[f->unit];
819 u_char opt_buf[CILEN_MPPE];
821 opt_buf[0] = CI_MPPE;
822 opt_buf[1] = CILEN_MPPE;
823 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
824 if (len < CILEN_MPPE || memcmp(opt_buf, p, CILEN_MPPE))
828 /* XXX Cope with first/fast ack */
834 if (len < CILEN_DEFLATE
835 || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
836 || p[1] != CILEN_DEFLATE
837 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
838 || p[3] != DEFLATE_CHK_SEQUENCE)
841 len -= CILEN_DEFLATE;
842 /* XXX Cope with first/fast ack */
845 if (go->deflate_correct && go->deflate_draft) {
846 if (len < CILEN_DEFLATE
847 || p[0] != CI_DEFLATE_DRAFT
848 || p[1] != CILEN_DEFLATE
849 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
850 || p[3] != DEFLATE_CHK_SEQUENCE)
853 len -= CILEN_DEFLATE;
856 if (go->bsd_compress) {
857 if (len < CILEN_BSD_COMPRESS
858 || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
859 || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
861 p += CILEN_BSD_COMPRESS;
862 len -= CILEN_BSD_COMPRESS;
863 /* XXX Cope with first/fast ack */
864 if (p == p0 && len == 0)
867 if (go->predictor_1) {
868 if (len < CILEN_PREDICTOR_1
869 || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
871 p += CILEN_PREDICTOR_1;
872 len -= CILEN_PREDICTOR_1;
873 /* XXX Cope with first/fast ack */
874 if (p == p0 && len == 0)
877 if (go->predictor_2) {
878 if (len < CILEN_PREDICTOR_2
879 || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
881 p += CILEN_PREDICTOR_2;
882 len -= CILEN_PREDICTOR_2;
883 /* XXX Cope with first/fast ack */
884 if (p == p0 && len == 0)
894 * ccp_nakci - process received configure-nak.
895 * Returns 1 iff the nak was OK.
903 ccp_options *go = &ccp_gotoptions[f->unit];
904 ccp_options no; /* options we've seen already */
905 ccp_options try; /* options to ask for next time */
907 memset(&no, 0, sizeof(no));
911 if (go->mppe && len >= CILEN_MPPE
912 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
915 * Peer wants us to use a different strength or other setting.
916 * Fail if we aren't willing to use his suggestion.
918 MPPE_CI_TO_OPTS(&p[2], try.mppe);
919 if ((try.mppe & MPPE_OPT_STATEFUL) && refuse_mppe_stateful) {
920 error("Refusing MPPE stateful mode offered by peer");
922 } else if (((go->mppe | MPPE_OPT_STATEFUL) & try.mppe) != try.mppe) {
923 /* Peer must have set options we didn't request (suggest) */
928 error("MPPE required but peer negotiation failed");
929 lcp_close(f->unit, "MPPE required but peer negotiation failed");
933 if (go->deflate && len >= CILEN_DEFLATE
934 && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
935 && p[1] == CILEN_DEFLATE) {
938 * Peer wants us to use a different code size or something.
939 * Stop asking for Deflate if we don't understand his suggestion.
941 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
942 || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_WORKS
943 || p[3] != DEFLATE_CHK_SEQUENCE)
945 else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
946 try.deflate_size = DEFLATE_SIZE(p[2]);
948 len -= CILEN_DEFLATE;
949 if (go->deflate_correct && go->deflate_draft
950 && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
951 && p[1] == CILEN_DEFLATE) {
953 len -= CILEN_DEFLATE;
957 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
958 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
961 * Peer wants us to use a different number of bits
962 * or a different version.
964 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
965 try.bsd_compress = 0;
966 else if (BSD_NBITS(p[2]) < go->bsd_bits)
967 try.bsd_bits = BSD_NBITS(p[2]);
968 p += CILEN_BSD_COMPRESS;
969 len -= CILEN_BSD_COMPRESS;
973 * Predictor-1 and 2 have no options, so they can't be Naked.
975 * There may be remaining options but we ignore them.
978 if (f->state != OPENED)
984 * ccp_rejci - reject some of our suggested compression methods.
992 ccp_options *go = &ccp_gotoptions[f->unit];
993 ccp_options try; /* options to request next time */
998 * Cope with empty configure-rejects by ceasing to send
999 * configure-requests.
1001 if (len == 0 && all_rejected[f->unit])
1005 if (go->mppe && len >= CILEN_MPPE
1006 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
1007 error("MPPE required but peer refused");
1008 lcp_close(f->unit, "MPPE required but peer refused");
1013 if (go->deflate && len >= CILEN_DEFLATE
1014 && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
1015 && p[1] == CILEN_DEFLATE) {
1016 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1017 || p[3] != DEFLATE_CHK_SEQUENCE)
1018 return 0; /* Rej is bad */
1019 if (go->deflate_correct)
1020 try.deflate_correct = 0;
1022 try.deflate_draft = 0;
1024 len -= CILEN_DEFLATE;
1025 if (go->deflate_correct && go->deflate_draft
1026 && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
1027 && p[1] == CILEN_DEFLATE) {
1028 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1029 || p[3] != DEFLATE_CHK_SEQUENCE)
1030 return 0; /* Rej is bad */
1031 try.deflate_draft = 0;
1033 len -= CILEN_DEFLATE;
1035 if (!try.deflate_correct && !try.deflate_draft)
1038 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
1039 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
1040 if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
1042 try.bsd_compress = 0;
1043 p += CILEN_BSD_COMPRESS;
1044 len -= CILEN_BSD_COMPRESS;
1046 if (go->predictor_1 && len >= CILEN_PREDICTOR_1
1047 && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
1048 try.predictor_1 = 0;
1049 p += CILEN_PREDICTOR_1;
1050 len -= CILEN_PREDICTOR_1;
1052 if (go->predictor_2 && len >= CILEN_PREDICTOR_2
1053 && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
1054 try.predictor_2 = 0;
1055 p += CILEN_PREDICTOR_2;
1056 len -= CILEN_PREDICTOR_2;
1062 if (f->state != OPENED)
1069 * ccp_reqci - processed a received configure-request.
1070 * Returns CONFACK, CONFNAK or CONFREJ and the packet modified
1074 ccp_reqci(f, p, lenp, dont_nak)
1080 int ret, newret, res;
1082 int len, clen, type, nb;
1083 ccp_options *ho = &ccp_hisoptions[f->unit];
1084 ccp_options *ao = &ccp_allowoptions[f->unit];
1086 bool rej_for_ci_mppe = 1; /* Are we rejecting based on a bad/missing */
1087 /* CI_MPPE, or due to other options? */
1094 memset(ho, 0, sizeof(ccp_options));
1095 ho->method = (len > 0)? p[0]: -1;
1099 if (len < 2 || p[1] < 2 || p[1] > len) {
1111 if (!ao->mppe || clen != CILEN_MPPE) {
1115 MPPE_CI_TO_OPTS(&p[2], ho->mppe);
1117 /* Nak if anything unsupported or unknown are set. */
1118 if (ho->mppe & MPPE_OPT_UNSUPPORTED) {
1120 ho->mppe &= ~MPPE_OPT_UNSUPPORTED;
1122 if (ho->mppe & MPPE_OPT_UNKNOWN) {
1124 ho->mppe &= ~MPPE_OPT_UNKNOWN;
1127 /* Check state opt */
1128 if (ho->mppe & MPPE_OPT_STATEFUL) {
1130 * We can Nak and request stateless, but it's a
1131 * lot easier to just assume the peer will request
1132 * it if he can do it; stateful mode is bad over
1133 * the Internet -- which is where we expect MPPE.
1135 if (refuse_mppe_stateful) {
1136 error("Refusing MPPE stateful mode offered by peer");
1142 /* Find out which of {S,L} are set. */
1143 if ((ho->mppe & MPPE_OPT_128)
1144 && (ho->mppe & MPPE_OPT_40)) {
1145 /* Both are set, negotiate the strongest. */
1147 if (ao->mppe & MPPE_OPT_128)
1148 ho->mppe &= ~MPPE_OPT_40;
1149 else if (ao->mppe & MPPE_OPT_40)
1150 ho->mppe &= ~MPPE_OPT_128;
1155 } else if (ho->mppe & MPPE_OPT_128) {
1156 if (!(ao->mppe & MPPE_OPT_128)) {
1160 } else if (ho->mppe & MPPE_OPT_40) {
1161 if (!(ao->mppe & MPPE_OPT_40)) {
1166 /* Neither are set. */
1171 /* rebuild the opts */
1172 MPPE_OPTS_TO_CI(ho->mppe, &p[2]);
1173 if (newret == CONFACK) {
1174 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
1177 BCOPY(p, opt_buf, CILEN_MPPE);
1178 BCOPY(mppe_send_key, &opt_buf[CILEN_MPPE],
1180 if (ccp_test(f->unit, opt_buf,
1181 CILEN_MPPE + MPPE_MAX_KEY_LEN, 1) <= 0) {
1182 /* This shouldn't happen, we've already tested it! */
1183 error("MPPE required, but kernel has no support.");
1184 lcp_close(f->unit, "MPPE required but not available");
1189 * We need to decrease the interface MTU by MPPE_PAD
1190 * because MPPE frames **grow**. The kernel [must]
1191 * allocate MPPE_PAD extra bytes in xmit buffers.
1193 mtu = netif_get_mtu(f->unit);
1195 netif_set_mtu(f->unit, mtu - MPPE_PAD);
1201 * We have accepted MPPE or are willing to negotiate
1202 * MPPE parameters. A CONFREJ is due to subsequent
1203 * (non-MPPE) processing.
1205 rej_for_ci_mppe = 0;
1209 case CI_DEFLATE_DRAFT:
1210 if (!ao->deflate || clen != CILEN_DEFLATE
1211 || (!ao->deflate_correct && type == CI_DEFLATE)
1212 || (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) {
1218 ho->deflate_size = nb = DEFLATE_SIZE(p[2]);
1219 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
1220 || p[3] != DEFLATE_CHK_SEQUENCE
1221 || nb > ao->deflate_size || nb < DEFLATE_MIN_WORKS) {
1224 p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
1225 p[3] = DEFLATE_CHK_SEQUENCE;
1226 /* fall through to test this #bits below */
1232 * Check whether we can do Deflate with the window
1233 * size they want. If the window is too big, reduce
1234 * it until the kernel can cope and nak with that.
1235 * We only check this for the first option.
1239 res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
1241 break; /* it's OK now */
1242 if (res < 0 || nb == DEFLATE_MIN_WORKS || dont_nak) {
1244 p[2] = DEFLATE_MAKE_OPT(ho->deflate_size);
1249 p[2] = DEFLATE_MAKE_OPT(nb);
1254 case CI_BSD_COMPRESS:
1255 if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) {
1260 ho->bsd_compress = 1;
1261 ho->bsd_bits = nb = BSD_NBITS(p[2]);
1262 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
1263 || nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
1266 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
1267 /* fall through to test this #bits below */
1273 * Check whether we can do BSD-Compress with the code
1274 * size they want. If the code size is too big, reduce
1275 * it until the kernel can cope and nak with that.
1276 * We only check this for the first option.
1280 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1);
1283 if (res < 0 || nb == BSD_MIN_BITS || dont_nak) {
1285 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION,
1291 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
1296 case CI_PREDICTOR_1:
1297 if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) {
1302 ho->predictor_1 = 1;
1304 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
1309 case CI_PREDICTOR_2:
1310 if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) {
1315 ho->predictor_2 = 1;
1317 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
1327 if (newret == CONFNAK && dont_nak)
1329 if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) {
1330 /* we're returning this option */
1331 if (newret == CONFREJ && ret == CONFNAK)
1335 BCOPY(p, retp, clen);
1343 if (ret != CONFACK) {
1344 if (ret == CONFREJ && *lenp == retp - p0)
1345 all_rejected[f->unit] = 1;
1350 if (ret == CONFREJ && ao->mppe && rej_for_ci_mppe) {
1351 error("MPPE required but peer negotiation failed");
1352 lcp_close(f->unit, "MPPE required but peer negotiation failed");
1359 * Make a string name for a compression method (or 2).
1362 method_name(opt, opt2)
1363 ccp_options *opt, *opt2;
1365 static char result[64];
1367 if (!ANY_COMPRESS(*opt))
1369 switch (opt->method) {
1374 char *q = result + sizeof(result); /* 1 past result */
1376 slprintf(p, q - p, "MPPE ");
1378 if (opt->mppe & MPPE_OPT_128) {
1379 slprintf(p, q - p, "128-bit ");
1382 if (opt->mppe & MPPE_OPT_40) {
1383 slprintf(p, q - p, "40-bit ");
1386 if (opt->mppe & MPPE_OPT_STATEFUL)
1387 slprintf(p, q - p, "stateful");
1389 slprintf(p, q - p, "stateless");
1395 case CI_DEFLATE_DRAFT:
1396 if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
1397 slprintf(result, sizeof(result), "Deflate%s (%d/%d)",
1398 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1399 opt->deflate_size, opt2->deflate_size);
1401 slprintf(result, sizeof(result), "Deflate%s (%d)",
1402 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1405 case CI_BSD_COMPRESS:
1406 if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
1407 slprintf(result, sizeof(result), "BSD-Compress (%d/%d)",
1408 opt->bsd_bits, opt2->bsd_bits);
1410 slprintf(result, sizeof(result), "BSD-Compress (%d)",
1413 case CI_PREDICTOR_1:
1414 return "Predictor 1";
1415 case CI_PREDICTOR_2:
1416 return "Predictor 2";
1418 slprintf(result, sizeof(result), "Method %d", opt->method);
1424 * CCP has come up - inform the kernel driver and log a message.
1430 ccp_options *go = &ccp_gotoptions[f->unit];
1431 ccp_options *ho = &ccp_hisoptions[f->unit];
1434 ccp_flags_set(f->unit, 1, 1);
1435 if (ANY_COMPRESS(*go)) {
1436 if (ANY_COMPRESS(*ho)) {
1437 if (go->method == ho->method) {
1438 notice("%s compression enabled", method_name(go, ho));
1440 strlcpy(method1, method_name(go, NULL), sizeof(method1));
1441 notice("%s / %s compression enabled",
1442 method1, method_name(ho, NULL));
1445 notice("%s receive compression enabled", method_name(go, NULL));
1446 } else if (ANY_COMPRESS(*ho))
1447 notice("%s transmit compression enabled", method_name(ho, NULL));
1450 BZERO(mppe_recv_key, MPPE_MAX_KEY_LEN);
1451 BZERO(mppe_send_key, MPPE_MAX_KEY_LEN);
1452 continue_networks(f->unit); /* Bring up IP et al */
1458 * CCP has gone down - inform the kernel driver.
1464 if (ccp_localstate[f->unit] & RACK_PENDING)
1465 UNTIMEOUT(ccp_rack_timeout, f);
1466 ccp_localstate[f->unit] = 0;
1467 ccp_flags_set(f->unit, 1, 0);
1469 if (ccp_gotoptions[f->unit].mppe) {
1470 ccp_gotoptions[f->unit].mppe = 0;
1471 if (lcp_fsm[f->unit].state == OPENED) {
1472 /* If LCP is not already going down, make sure it does. */
1473 error("MPPE disabled");
1474 lcp_close(f->unit, "MPPE disabled");
1481 * Print the contents of a CCP packet.
1483 static char *ccp_codenames[] = {
1484 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1485 "TermReq", "TermAck", "CodeRej",
1486 NULL, NULL, NULL, NULL, NULL, NULL,
1487 "ResetReq", "ResetAck",
1491 ccp_printpkt(p, plen, printer, arg)
1494 void (*printer) __P((void *, char *, ...));
1497 u_char *p0, *optend;
1502 if (plen < HEADERLEN)
1506 len = (p[2] << 8) + p[3];
1507 if (len < HEADERLEN || len > plen)
1510 if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *)
1511 && ccp_codenames[code-1] != NULL)
1512 printer(arg, " %s", ccp_codenames[code-1]);
1514 printer(arg, " code=0x%x", code);
1515 printer(arg, " id=0x%x", id);
1524 /* print list of possible compression methods */
1528 if (optlen < 2 || optlen > len)
1532 optend = p + optlen;
1536 if (optlen >= CILEN_MPPE) {
1539 MPPE_CI_TO_OPTS(&p[2], mppe_opts);
1540 printer(arg, "mppe %s %s %s %s %s %s%s",
1541 (p[2] & MPPE_H_BIT)? "+H": "-H",
1542 (p[5] & MPPE_M_BIT)? "+M": "-M",
1543 (p[5] & MPPE_S_BIT)? "+S": "-S",
1544 (p[5] & MPPE_L_BIT)? "+L": "-L",
1545 (p[5] & MPPE_D_BIT)? "+D": "-D",
1546 (p[5] & MPPE_C_BIT)? "+C": "-C",
1547 (mppe_opts & MPPE_OPT_UNKNOWN)? " +U": "");
1548 if (mppe_opts & MPPE_OPT_UNKNOWN)
1549 printer(arg, " (%.2x %.2x %.2x %.2x)",
1550 p[2], p[3], p[4], p[5]);
1556 case CI_DEFLATE_DRAFT:
1557 if (optlen >= CILEN_DEFLATE) {
1558 printer(arg, "deflate%s %d",
1559 (code == CI_DEFLATE_DRAFT? "(old#)": ""),
1560 DEFLATE_SIZE(p[2]));
1561 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
1562 printer(arg, " method %d", DEFLATE_METHOD(p[2]));
1563 if (p[3] != DEFLATE_CHK_SEQUENCE)
1564 printer(arg, " check %d", p[3]);
1568 case CI_BSD_COMPRESS:
1569 if (optlen >= CILEN_BSD_COMPRESS) {
1570 printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
1572 p += CILEN_BSD_COMPRESS;
1575 case CI_PREDICTOR_1:
1576 if (optlen >= CILEN_PREDICTOR_1) {
1577 printer(arg, "predictor 1");
1578 p += CILEN_PREDICTOR_1;
1581 case CI_PREDICTOR_2:
1582 if (optlen >= CILEN_PREDICTOR_2) {
1583 printer(arg, "predictor 2");
1584 p += CILEN_PREDICTOR_2;
1589 printer(arg, " %.2x", *p++);
1596 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1597 print_string((char *)p, len, printer, arg);
1604 /* dump out the rest of the packet in hex */
1606 printer(arg, " %.2x", *p++);
1612 * We have received a packet that the decompressor failed to
1613 * decompress. Here we would expect to issue a reset-request, but
1614 * Motorola has a patent on resetting the compressor as a result of
1615 * detecting an error in the decompressed data after decompression.
1616 * (See US patent 5,130,993; international patent publication number
1617 * WO 91/10289; Australian patent 73296/91.)
1619 * So we ask the kernel whether the error was detected after
1620 * decompression; if it was, we take CCP down, thus disabling
1621 * compression :-(, otherwise we issue the reset-request.
1624 ccp_datainput(unit, pkt, len)
1632 if (f->state == OPENED) {
1633 if (ccp_fatal_error(unit)) {
1635 * Disable compression by taking CCP down.
1637 error("Lost compression sync: disabling compression");
1638 ccp_close(unit, "Lost compression sync");
1641 * If we were doing MPPE, we must also take the link down.
1643 if (ccp_gotoptions[unit].mppe) {
1644 error("Too many MPPE errors, closing LCP");
1645 lcp_close(unit, "Too many MPPE errors");
1650 * Send a reset-request to reset the peer's compressor.
1651 * We don't do that if we are still waiting for an
1652 * acknowledgement to a previous reset-request.
1654 if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
1655 fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
1656 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1657 ccp_localstate[f->unit] |= RACK_PENDING;
1659 ccp_localstate[f->unit] |= RREQ_REPEAT;
1665 * Timeout waiting for reset-ack.
1668 ccp_rack_timeout(arg)
1673 if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
1674 fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
1675 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1676 ccp_localstate[f->unit] &= ~RREQ_REPEAT;
1678 ccp_localstate[f->unit] &= ~RACK_PENDING;