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. The name(s) of the authors of this software must not be used to
14 * endorse or promote products derived from this software without
15 * prior written permission.
17 * 3. Redistributions of any form whatsoever must retain the following
19 * "This product includes software developed by Paul Mackerras
20 * <paulus@samba.org>".
22 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
23 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
24 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
26 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
27 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
28 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
31 #define RCSID "$Id: ccp.c,v 1.50 2005/06/26 19:34:41 carlsonj Exp $"
39 #include <net/ppp-comp.h>
42 #include "chap_ms.h" /* mppe_xxxx_key, mppe_keys_set */
43 #include "lcp.h" /* lcp_close(), lcp_fsm */
48 * Unfortunately there is a bug in zlib which means that using a
49 * size of 8 (window size = 256) for Deflate compression will cause
50 * buffer overruns and kernel crashes in the deflate module.
51 * Until this is fixed we only accept sizes in the range 9 .. 15.
52 * Thanks to James Carlson for pointing this out.
54 #define DEFLATE_MIN_WORKS 9
57 * Command-line options.
59 static int setbsdcomp (char **);
60 static int setdeflate (char **);
61 static char bsd_value[8];
62 static char deflate_value[8];
68 bool refuse_mppe_stateful = 1; /* Allow stateful mode? */
71 static option_t ccp_option_list[] = {
72 { "noccp", o_bool, &ccp_protent.enabled_flag,
73 "Disable CCP negotiation" },
74 { "-ccp", o_bool, &ccp_protent.enabled_flag,
75 "Disable CCP negotiation", OPT_ALIAS },
77 { "bsdcomp", o_special, (void *)setbsdcomp,
78 "Request BSD-Compress packet compression",
79 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value },
80 { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
81 "don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR,
82 &ccp_allowoptions[0].bsd_compress },
83 { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
84 "don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
85 &ccp_allowoptions[0].bsd_compress },
87 { "deflate", o_special, (void *)setdeflate,
88 "request Deflate compression",
89 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value },
90 { "nodeflate", o_bool, &ccp_wantoptions[0].deflate,
91 "don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR,
92 &ccp_allowoptions[0].deflate },
93 { "-deflate", o_bool, &ccp_wantoptions[0].deflate,
94 "don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
95 &ccp_allowoptions[0].deflate },
97 { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft,
98 "don't use draft deflate #", OPT_A2COPY,
99 &ccp_allowoptions[0].deflate_draft },
101 { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
102 "request Predictor-1", OPT_PRIO | 1 },
103 { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1,
104 "don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR,
105 &ccp_allowoptions[0].predictor_1 },
106 { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
107 "don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
108 &ccp_allowoptions[0].predictor_1 },
111 /* MPPE options are symmetrical ... we only set wantoptions here */
112 { "require-mppe", o_bool, &ccp_wantoptions[0].mppe,
113 "require MPPE encryption",
114 OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
115 { "+mppe", o_bool, &ccp_wantoptions[0].mppe,
116 "require MPPE encryption",
117 OPT_ALIAS | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
118 { "nomppe", o_bool, &ccp_wantoptions[0].mppe,
119 "don't allow MPPE encryption", OPT_PRIO },
120 { "-mppe", o_bool, &ccp_wantoptions[0].mppe,
121 "don't allow MPPE encryption", OPT_ALIAS | OPT_PRIO },
123 /* We use ccp_allowoptions[0].mppe as a junk var ... it is reset later */
124 { "require-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
125 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
126 &ccp_wantoptions[0].mppe },
127 { "+mppe-40", o_bool, &ccp_allowoptions[0].mppe,
128 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
129 &ccp_wantoptions[0].mppe },
130 { "nomppe-40", o_bool, &ccp_allowoptions[0].mppe,
131 "don't allow MPPE 40-bit encryption",
132 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40, &ccp_wantoptions[0].mppe },
133 { "-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
134 "don't allow MPPE 40-bit encryption",
135 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40,
136 &ccp_wantoptions[0].mppe },
138 { "require-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
139 "require MPPE 128-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
140 &ccp_wantoptions[0].mppe },
141 { "+mppe-128", o_bool, &ccp_allowoptions[0].mppe,
142 "require MPPE 128-bit encryption",
143 OPT_ALIAS | OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
144 &ccp_wantoptions[0].mppe },
145 { "nomppe-128", o_bool, &ccp_allowoptions[0].mppe,
146 "don't allow MPPE 128-bit encryption",
147 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128, &ccp_wantoptions[0].mppe },
148 { "-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
149 "don't allow MPPE 128-bit encryption",
150 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128,
151 &ccp_wantoptions[0].mppe },
153 /* strange one; we always request stateless, but will we allow stateful? */
154 { "mppe-stateful", o_bool, &refuse_mppe_stateful,
155 "allow MPPE stateful mode", OPT_PRIO },
156 { "nomppe-stateful", o_bool, &refuse_mppe_stateful,
157 "disallow MPPE stateful mode", OPT_PRIO | 1 },
164 * Protocol entry points from main code.
166 static void ccp_init (int unit);
167 static void ccp_open (int unit);
168 static void ccp_close (int unit, char *);
169 static void ccp_lowerup (int unit);
170 static void ccp_lowerdown (int);
171 static void ccp_input (int unit, u_char *pkt, int len);
172 static void ccp_protrej (int unit);
173 static int ccp_printpkt (u_char *pkt, int len,
174 void (*printer)(void *, char *, ...),
176 static void ccp_datainput (int unit, u_char *pkt, int len);
178 struct protent ccp_protent = {
198 fsm ccp_fsm[NUM_PPP];
199 ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */
200 ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */
201 ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */
202 ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */
205 * Callbacks for fsm code.
207 static void ccp_resetci (fsm *);
208 static int ccp_cilen (fsm *);
209 static void ccp_addci (fsm *, u_char *, int *);
210 static int ccp_ackci (fsm *, u_char *, int);
211 static int ccp_nakci (fsm *, u_char *, int, int);
212 static int ccp_rejci (fsm *, u_char *, int);
213 static int ccp_reqci (fsm *, u_char *, int *, int);
214 static void ccp_up (fsm *);
215 static void ccp_down (fsm *);
216 static int ccp_extcode (fsm *, int, int, u_char *, int);
217 static void ccp_rack_timeout (void *);
218 static char *method_name (ccp_options *, ccp_options *);
220 static fsm_callbacks ccp_callbacks = {
239 * Do we want / did we get any compression?
241 #define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \
242 || (opt).predictor_1 || (opt).predictor_2 \
246 * Local state (mainly for handling reset-reqs and reset-acks).
248 static int ccp_localstate[NUM_PPP];
249 #define RACK_PENDING 1 /* waiting for reset-ack */
250 #define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
252 #define RACKTIMEOUT 1 /* second */
254 static int all_rejected[NUM_PPP]; /* we rejected all peer's options */
260 setbsdcomp(char **argv)
266 abits = rbits = strtol(str, &endp, 0);
267 if (endp != str && *endp == ',') {
269 abits = strtol(str, &endp, 0);
271 if (*endp != 0 || endp == str) {
272 option_error("invalid parameter '%s' for bsdcomp option", *argv);
275 if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS))
276 || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) {
277 option_error("bsdcomp option values must be 0 or %d .. %d",
278 BSD_MIN_BITS, BSD_MAX_BITS);
282 ccp_wantoptions[0].bsd_compress = 1;
283 ccp_wantoptions[0].bsd_bits = rbits;
285 ccp_wantoptions[0].bsd_compress = 0;
287 ccp_allowoptions[0].bsd_compress = 1;
288 ccp_allowoptions[0].bsd_bits = abits;
290 ccp_allowoptions[0].bsd_compress = 0;
291 slprintf(bsd_value, sizeof(bsd_value),
292 rbits == abits? "%d": "%d,%d", rbits, abits);
298 setdeflate(char **argv)
304 abits = rbits = strtol(str, &endp, 0);
305 if (endp != str && *endp == ',') {
307 abits = strtol(str, &endp, 0);
309 if (*endp != 0 || endp == str) {
310 option_error("invalid parameter '%s' for deflate option", *argv);
313 if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE))
314 || (abits != 0 && (abits < DEFLATE_MIN_SIZE
315 || abits > DEFLATE_MAX_SIZE))) {
316 option_error("deflate option values must be 0 or %d .. %d",
317 DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE);
320 if (rbits == DEFLATE_MIN_SIZE || abits == DEFLATE_MIN_SIZE) {
321 if (rbits == DEFLATE_MIN_SIZE)
322 rbits = DEFLATE_MIN_WORKS;
323 if (abits == DEFLATE_MIN_SIZE)
324 abits = DEFLATE_MIN_WORKS;
325 warn("deflate option value of %d changed to %d to avoid zlib bug",
326 DEFLATE_MIN_SIZE, DEFLATE_MIN_WORKS);
329 ccp_wantoptions[0].deflate = 1;
330 ccp_wantoptions[0].deflate_size = rbits;
332 ccp_wantoptions[0].deflate = 0;
334 ccp_allowoptions[0].deflate = 1;
335 ccp_allowoptions[0].deflate_size = abits;
337 ccp_allowoptions[0].deflate = 0;
338 slprintf(deflate_value, sizeof(deflate_value),
339 rbits == abits? "%d": "%d,%d", rbits, abits);
345 * ccp_init - initialize CCP.
350 fsm *f = &ccp_fsm[unit];
353 f->protocol = PPP_CCP;
354 f->callbacks = &ccp_callbacks;
357 memset(&ccp_wantoptions[unit], 0, sizeof(ccp_options));
358 memset(&ccp_gotoptions[unit], 0, sizeof(ccp_options));
359 memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
360 memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
362 ccp_wantoptions[0].deflate = 1;
363 ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE;
364 ccp_wantoptions[0].deflate_correct = 1;
365 ccp_wantoptions[0].deflate_draft = 1;
366 ccp_allowoptions[0].deflate = 1;
367 ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE;
368 ccp_allowoptions[0].deflate_correct = 1;
369 ccp_allowoptions[0].deflate_draft = 1;
371 ccp_wantoptions[0].bsd_compress = 1;
372 ccp_wantoptions[0].bsd_bits = BSD_MAX_BITS;
373 ccp_allowoptions[0].bsd_compress = 1;
374 ccp_allowoptions[0].bsd_bits = BSD_MAX_BITS;
376 ccp_allowoptions[0].predictor_1 = 1;
380 * ccp_open - CCP is allowed to come up.
385 fsm *f = &ccp_fsm[unit];
387 if (f->state != OPENED)
388 ccp_flags_set(unit, 1, 0);
391 * Find out which compressors the kernel supports before
392 * deciding whether to open in silent mode.
395 if (!ANY_COMPRESS(ccp_gotoptions[unit]))
396 f->flags |= OPT_SILENT;
402 * ccp_close - Terminate CCP.
405 ccp_close(int unit, char *reason)
407 ccp_flags_set(unit, 0, 0);
408 fsm_close(&ccp_fsm[unit], reason);
412 * ccp_lowerup - we may now transmit CCP packets.
415 ccp_lowerup(int unit)
417 fsm_lowerup(&ccp_fsm[unit]);
421 * ccp_lowerdown - we may not transmit CCP packets.
424 ccp_lowerdown(int unit)
426 fsm_lowerdown(&ccp_fsm[unit]);
430 * ccp_input - process a received CCP packet.
433 ccp_input(int unit, u_char *p, int len)
435 fsm *f = &ccp_fsm[unit];
439 * Check for a terminate-request so we can print a message.
442 fsm_input(f, p, len);
443 if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED) {
444 notice("Compression disabled by peer.");
446 if (ccp_gotoptions[unit].mppe) {
447 error("MPPE disabled, closing LCP");
448 lcp_close(unit, "MPPE disabled by peer");
454 * If we get a terminate-ack and we're not asking for compression,
457 if (oldstate == REQSENT && p[0] == TERMACK
458 && !ANY_COMPRESS(ccp_gotoptions[unit]))
459 ccp_close(unit, "No compression negotiated");
463 * Handle a CCP-specific code.
466 ccp_extcode(fsm *f, int code, int id, u_char *p, int len)
470 if (f->state != OPENED)
472 /* send a reset-ack, which the transmitter will see and
473 reset its compression state. */
474 fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
478 if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) {
479 ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT);
480 UNTIMEOUT(ccp_rack_timeout, f);
492 * ccp_protrej - peer doesn't talk CCP.
495 ccp_protrej(int unit)
497 ccp_flags_set(unit, 0, 0);
498 fsm_lowerdown(&ccp_fsm[unit]);
501 if (ccp_gotoptions[unit].mppe) {
502 error("MPPE required but peer negotiation failed");
503 lcp_close(unit, "MPPE required but peer negotiation failed");
510 * ccp_resetci - initialize at start of negotiation.
515 ccp_options *go = &ccp_gotoptions[f->unit];
516 u_char opt_buf[CCP_MAX_OPTION_LENGTH];
518 *go = ccp_wantoptions[f->unit];
519 all_rejected[f->unit] = 0;
523 ccp_options *ao = &ccp_allowoptions[f->unit];
524 int auth_mschap_bits = auth_done[f->unit];
526 int auth_eap_bits = auth_done[f->unit];
531 * Start with a basic sanity check: mschap[v2] auth must be in
532 * exactly one direction. RFC 3079 says that the keys are
533 * 'derived from the credentials of the peer that initiated the call',
534 * however the PPP protocol doesn't have such a concept, and pppd
535 * cannot get this info externally. Instead we do the best we can.
536 * NB: If MPPE is required, all other compression opts are invalid.
537 * So, we return right away if we can't do it.
540 /* Leave only the mschap auth bits set */
541 auth_mschap_bits &= (CHAP_MS_WITHPEER | CHAP_MS_PEER |
542 CHAP_MS2_WITHPEER | CHAP_MS2_PEER);
543 /* Count the mschap auths */
544 auth_mschap_bits >>= CHAP_MS_SHIFT;
547 numbits += auth_mschap_bits & 1;
548 auth_mschap_bits >>= 1;
549 } while (auth_mschap_bits);
551 error("MPPE required, but auth done in both directions.");
552 lcp_close(f->unit, "MPPE required but not available");
558 * MPPE is also possible in combination with EAP-TLS.
559 * It is not possible to detect if we're doing EAP or EAP-TLS
560 * at this stage, hence we accept all forms of EAP. If TLS is
561 * not used then the MPPE keys will not be derived anyway.
563 /* Leave only the eap auth bits set */
564 auth_eap_bits &= (EAP_WITHPEER | EAP_PEER );
566 if ((numbits == 0) && (auth_eap_bits == 0)) {
567 error("MPPE required, but MS-CHAP[v2] nor EAP-TLS auth are performed.");
570 error("MPPE required, but MS-CHAP[v2] auth not performed.");
572 lcp_close(f->unit, "MPPE required but not available");
576 /* A plugin (eg radius) may not have obtained key material. */
577 if (!mppe_keys_set) {
578 error("MPPE required, but keys are not available. "
579 "Possible plugin problem?");
580 lcp_close(f->unit, "MPPE required but not available");
584 /* LM auth not supported for MPPE */
585 if (auth_done[f->unit] & (CHAP_MS_WITHPEER | CHAP_MS_PEER)) {
586 /* This might be noise */
587 if (go->mppe & MPPE_OPT_40) {
588 notice("Disabling 40-bit MPPE; MS-CHAP LM not supported");
589 go->mppe &= ~MPPE_OPT_40;
590 ccp_wantoptions[f->unit].mppe &= ~MPPE_OPT_40;
594 /* Last check: can we actually negotiate something? */
595 if (!(go->mppe & (MPPE_OPT_40 | MPPE_OPT_128))) {
596 /* Could be misconfig, could be 40-bit disabled above. */
597 error("MPPE required, but both 40-bit and 128-bit disabled.");
598 lcp_close(f->unit, "MPPE required but not available");
604 /* MPPE is not compatible with other compression types */
605 ao->bsd_compress = go->bsd_compress = 0;
606 ao->predictor_1 = go->predictor_1 = 0;
607 ao->predictor_2 = go->predictor_2 = 0;
608 ao->deflate = go->deflate = 0;
613 * Check whether the kernel knows about the various
614 * compression methods we might request.
618 opt_buf[0] = CI_MPPE;
619 opt_buf[1] = CILEN_MPPE;
620 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
621 /* Key material unimportant here. */
622 if (ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0) <= 0) {
623 error("MPPE required, but kernel has no support.");
624 lcp_close(f->unit, "MPPE required but not available");
628 if (go->bsd_compress) {
629 opt_buf[0] = CI_BSD_COMPRESS;
630 opt_buf[1] = CILEN_BSD_COMPRESS;
631 opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS);
632 if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0)
633 go->bsd_compress = 0;
636 if (go->deflate_correct) {
637 opt_buf[0] = CI_DEFLATE;
638 opt_buf[1] = CILEN_DEFLATE;
639 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
640 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
641 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
642 go->deflate_correct = 0;
644 if (go->deflate_draft) {
645 opt_buf[0] = CI_DEFLATE_DRAFT;
646 opt_buf[1] = CILEN_DEFLATE;
647 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
648 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
649 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
650 go->deflate_draft = 0;
652 if (!go->deflate_correct && !go->deflate_draft)
655 if (go->predictor_1) {
656 opt_buf[0] = CI_PREDICTOR_1;
657 opt_buf[1] = CILEN_PREDICTOR_1;
658 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
661 if (go->predictor_2) {
662 opt_buf[0] = CI_PREDICTOR_2;
663 opt_buf[1] = CILEN_PREDICTOR_2;
664 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
670 * ccp_cilen - Return total length of our configuration info.
675 ccp_options *go = &ccp_gotoptions[f->unit];
677 return (go->bsd_compress? CILEN_BSD_COMPRESS: 0)
678 + (go->deflate && go->deflate_correct? CILEN_DEFLATE: 0)
679 + (go->deflate && go->deflate_draft? CILEN_DEFLATE: 0)
680 + (go->predictor_1? CILEN_PREDICTOR_1: 0)
681 + (go->predictor_2? CILEN_PREDICTOR_2: 0)
682 + (go->mppe? CILEN_MPPE: 0);
686 * ccp_addci - put our requests in a packet.
689 ccp_addci(fsm *f, u_char *p, int *lenp)
692 ccp_options *go = &ccp_gotoptions[f->unit];
696 * Add the compression types that we can receive, in decreasing
697 * preference order. Get the kernel to allocate the first one
698 * in case it gets Acked.
702 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
704 p[0] = opt_buf[0] = CI_MPPE;
705 p[1] = opt_buf[1] = CILEN_MPPE;
706 MPPE_OPTS_TO_CI(go->mppe, &p[2]);
707 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
708 BCOPY(mppe_recv_key, &opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
709 res = ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0);
713 /* This shouldn't happen, we've already tested it! */
714 lcp_close(f->unit, "MPPE required but not available in kernel");
718 p[0] = go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT;
719 p[1] = CILEN_DEFLATE;
720 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
721 p[3] = DEFLATE_CHK_SEQUENCE;
726 if (go->deflate_size < DEFLATE_MIN_WORKS) {
730 res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
734 } else if (res < 0) {
739 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
742 if (p != p0 && go->deflate_correct && go->deflate_draft) {
743 p[0] = CI_DEFLATE_DRAFT;
744 p[1] = CILEN_DEFLATE;
745 p[2] = p[2 - CILEN_DEFLATE];
746 p[3] = DEFLATE_CHK_SEQUENCE;
750 if (go->bsd_compress) {
751 p[0] = CI_BSD_COMPRESS;
752 p[1] = CILEN_BSD_COMPRESS;
753 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
755 p += CILEN_BSD_COMPRESS; /* not the first option */
758 if (go->bsd_bits < BSD_MIN_BITS) {
759 go->bsd_compress = 0;
762 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0);
764 p += CILEN_BSD_COMPRESS;
766 } else if (res < 0) {
767 go->bsd_compress = 0;
771 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
775 /* XXX Should Predictor 2 be preferable to Predictor 1? */
776 if (go->predictor_1) {
777 p[0] = CI_PREDICTOR_1;
778 p[1] = CILEN_PREDICTOR_1;
779 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) {
782 p += CILEN_PREDICTOR_1;
785 if (go->predictor_2) {
786 p[0] = CI_PREDICTOR_2;
787 p[1] = CILEN_PREDICTOR_2;
788 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) {
791 p += CILEN_PREDICTOR_2;
795 go->method = (p > p0)? p0[0]: -1;
801 * ccp_ackci - process a received configure-ack, and return
802 * 1 iff the packet was OK.
805 ccp_ackci(fsm *f, u_char *p, int len)
807 ccp_options *go = &ccp_gotoptions[f->unit];
812 u_char opt_buf[CILEN_MPPE];
814 opt_buf[0] = CI_MPPE;
815 opt_buf[1] = CILEN_MPPE;
816 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
817 if (len < CILEN_MPPE || memcmp(opt_buf, p, CILEN_MPPE))
821 /* XXX Cope with first/fast ack */
827 if (len < CILEN_DEFLATE
828 || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
829 || p[1] != CILEN_DEFLATE
830 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
831 || p[3] != DEFLATE_CHK_SEQUENCE)
834 len -= CILEN_DEFLATE;
835 /* XXX Cope with first/fast ack */
838 if (go->deflate_correct && go->deflate_draft) {
839 if (len < CILEN_DEFLATE
840 || p[0] != CI_DEFLATE_DRAFT
841 || p[1] != CILEN_DEFLATE
842 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
843 || p[3] != DEFLATE_CHK_SEQUENCE)
846 len -= CILEN_DEFLATE;
849 if (go->bsd_compress) {
850 if (len < CILEN_BSD_COMPRESS
851 || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
852 || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
854 p += CILEN_BSD_COMPRESS;
855 len -= CILEN_BSD_COMPRESS;
856 /* XXX Cope with first/fast ack */
857 if (p == p0 && len == 0)
860 if (go->predictor_1) {
861 if (len < CILEN_PREDICTOR_1
862 || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
864 p += CILEN_PREDICTOR_1;
865 len -= CILEN_PREDICTOR_1;
866 /* XXX Cope with first/fast ack */
867 if (p == p0 && len == 0)
870 if (go->predictor_2) {
871 if (len < CILEN_PREDICTOR_2
872 || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
874 p += CILEN_PREDICTOR_2;
875 len -= CILEN_PREDICTOR_2;
876 /* XXX Cope with first/fast ack */
877 if (p == p0 && len == 0)
887 * ccp_nakci - process received configure-nak.
888 * Returns 1 iff the nak was OK.
891 ccp_nakci(fsm *f, u_char *p, int len, int treat_as_reject)
893 ccp_options *go = &ccp_gotoptions[f->unit];
894 ccp_options no; /* options we've seen already */
895 ccp_options try; /* options to ask for next time */
897 memset(&no, 0, sizeof(no));
901 if (go->mppe && len >= CILEN_MPPE
902 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
905 * Peer wants us to use a different strength or other setting.
906 * Fail if we aren't willing to use his suggestion.
908 MPPE_CI_TO_OPTS(&p[2], try.mppe);
909 if ((try.mppe & MPPE_OPT_STATEFUL) && refuse_mppe_stateful) {
910 error("Refusing MPPE stateful mode offered by peer");
912 } else if (((go->mppe | MPPE_OPT_STATEFUL) & try.mppe) != try.mppe) {
913 /* Peer must have set options we didn't request (suggest) */
918 error("MPPE required but peer negotiation failed");
919 lcp_close(f->unit, "MPPE required but peer negotiation failed");
923 if (go->deflate && len >= CILEN_DEFLATE
924 && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
925 && p[1] == CILEN_DEFLATE) {
928 * Peer wants us to use a different code size or something.
929 * Stop asking for Deflate if we don't understand his suggestion.
931 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
932 || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_WORKS
933 || p[3] != DEFLATE_CHK_SEQUENCE)
935 else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
936 try.deflate_size = DEFLATE_SIZE(p[2]);
938 len -= CILEN_DEFLATE;
939 if (go->deflate_correct && go->deflate_draft
940 && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
941 && p[1] == CILEN_DEFLATE) {
943 len -= CILEN_DEFLATE;
947 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
948 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
951 * Peer wants us to use a different number of bits
952 * or a different version.
954 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
955 try.bsd_compress = 0;
956 else if (BSD_NBITS(p[2]) < go->bsd_bits)
957 try.bsd_bits = BSD_NBITS(p[2]);
958 p += CILEN_BSD_COMPRESS;
959 len -= CILEN_BSD_COMPRESS;
963 * Predictor-1 and 2 have no options, so they can't be Naked.
965 * There may be remaining options but we ignore them.
968 if (f->state != OPENED)
974 * ccp_rejci - reject some of our suggested compression methods.
977 ccp_rejci(fsm *f, u_char *p, int len)
979 ccp_options *go = &ccp_gotoptions[f->unit];
980 ccp_options try; /* options to request next time */
985 * Cope with empty configure-rejects by ceasing to send
986 * configure-requests.
988 if (len == 0 && all_rejected[f->unit])
992 if (go->mppe && len >= CILEN_MPPE
993 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
994 error("MPPE required but peer refused");
995 lcp_close(f->unit, "MPPE required but peer refused");
1000 if (go->deflate_correct && len >= CILEN_DEFLATE
1001 && p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
1002 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1003 || p[3] != DEFLATE_CHK_SEQUENCE)
1004 return 0; /* Rej is bad */
1005 try.deflate_correct = 0;
1007 len -= CILEN_DEFLATE;
1009 if (go->deflate_draft && len >= CILEN_DEFLATE
1010 && p[0] == CI_DEFLATE_DRAFT && p[1] == CILEN_DEFLATE) {
1011 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1012 || p[3] != DEFLATE_CHK_SEQUENCE)
1013 return 0; /* Rej is bad */
1014 try.deflate_draft = 0;
1016 len -= CILEN_DEFLATE;
1018 if (!try.deflate_correct && !try.deflate_draft)
1020 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
1021 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
1022 if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
1024 try.bsd_compress = 0;
1025 p += CILEN_BSD_COMPRESS;
1026 len -= CILEN_BSD_COMPRESS;
1028 if (go->predictor_1 && len >= CILEN_PREDICTOR_1
1029 && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
1030 try.predictor_1 = 0;
1031 p += CILEN_PREDICTOR_1;
1032 len -= CILEN_PREDICTOR_1;
1034 if (go->predictor_2 && len >= CILEN_PREDICTOR_2
1035 && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
1036 try.predictor_2 = 0;
1037 p += CILEN_PREDICTOR_2;
1038 len -= CILEN_PREDICTOR_2;
1044 if (f->state != OPENED)
1051 * ccp_reqci - processed a received configure-request.
1052 * Returns CONFACK, CONFNAK or CONFREJ and the packet modified
1056 ccp_reqci(fsm *f, u_char *p, int *lenp, int dont_nak)
1058 int ret, newret, res;
1060 int len, clen, type, nb;
1061 ccp_options *ho = &ccp_hisoptions[f->unit];
1062 ccp_options *ao = &ccp_allowoptions[f->unit];
1064 bool rej_for_ci_mppe = 1; /* Are we rejecting based on a bad/missing */
1065 /* CI_MPPE, or due to other options? */
1072 memset(ho, 0, sizeof(ccp_options));
1073 ho->method = (len > 0)? p[0]: -1;
1077 if (len < 2 || p[1] < 2 || p[1] > len) {
1089 if (!ao->mppe || clen != CILEN_MPPE) {
1093 MPPE_CI_TO_OPTS(&p[2], ho->mppe);
1095 /* Nak if anything unsupported or unknown are set. */
1096 if (ho->mppe & MPPE_OPT_UNSUPPORTED) {
1098 ho->mppe &= ~MPPE_OPT_UNSUPPORTED;
1100 if (ho->mppe & MPPE_OPT_UNKNOWN) {
1102 ho->mppe &= ~MPPE_OPT_UNKNOWN;
1105 /* Check state opt */
1106 if (ho->mppe & MPPE_OPT_STATEFUL) {
1108 * We can Nak and request stateless, but it's a
1109 * lot easier to just assume the peer will request
1110 * it if he can do it; stateful mode is bad over
1111 * the Internet -- which is where we expect MPPE.
1113 if (refuse_mppe_stateful) {
1114 error("Refusing MPPE stateful mode offered by peer");
1120 /* Find out which of {S,L} are set. */
1121 if ((ho->mppe & MPPE_OPT_128)
1122 && (ho->mppe & MPPE_OPT_40)) {
1123 /* Both are set, negotiate the strongest. */
1125 if (ao->mppe & MPPE_OPT_128)
1126 ho->mppe &= ~MPPE_OPT_40;
1127 else if (ao->mppe & MPPE_OPT_40)
1128 ho->mppe &= ~MPPE_OPT_128;
1133 } else if (ho->mppe & MPPE_OPT_128) {
1134 if (!(ao->mppe & MPPE_OPT_128)) {
1138 } else if (ho->mppe & MPPE_OPT_40) {
1139 if (!(ao->mppe & MPPE_OPT_40)) {
1144 /* Neither are set. */
1145 /* We cannot accept this. */
1147 /* Give the peer our idea of what can be used,
1148 so it can choose and confirm */
1149 ho->mppe = ao->mppe;
1152 /* rebuild the opts */
1153 MPPE_OPTS_TO_CI(ho->mppe, &p[2]);
1154 if (newret == CONFACK) {
1155 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
1158 BCOPY(p, opt_buf, CILEN_MPPE);
1159 BCOPY(mppe_send_key, &opt_buf[CILEN_MPPE],
1161 if (ccp_test(f->unit, opt_buf,
1162 CILEN_MPPE + MPPE_MAX_KEY_LEN, 1) <= 0) {
1163 /* This shouldn't happen, we've already tested it! */
1164 error("MPPE required, but kernel has no support.");
1165 lcp_close(f->unit, "MPPE required but not available");
1170 * We need to decrease the interface MTU by MPPE_PAD
1171 * because MPPE frames **grow**. The kernel [must]
1172 * allocate MPPE_PAD extra bytes in xmit buffers.
1174 mtu = netif_get_mtu(f->unit);
1176 netif_set_mtu(f->unit, mtu - MPPE_PAD);
1182 * We have accepted MPPE or are willing to negotiate
1183 * MPPE parameters. A CONFREJ is due to subsequent
1184 * (non-MPPE) processing.
1186 rej_for_ci_mppe = 0;
1190 case CI_DEFLATE_DRAFT:
1191 if (!ao->deflate || clen != CILEN_DEFLATE
1192 || (!ao->deflate_correct && type == CI_DEFLATE)
1193 || (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) {
1199 ho->deflate_size = nb = DEFLATE_SIZE(p[2]);
1200 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
1201 || p[3] != DEFLATE_CHK_SEQUENCE
1202 || nb > ao->deflate_size || nb < DEFLATE_MIN_WORKS) {
1205 p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
1206 p[3] = DEFLATE_CHK_SEQUENCE;
1207 /* fall through to test this #bits below */
1213 * Check whether we can do Deflate with the window
1214 * size they want. If the window is too big, reduce
1215 * it until the kernel can cope and nak with that.
1216 * We only check this for the first option.
1220 res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
1222 break; /* it's OK now */
1223 if (res < 0 || nb == DEFLATE_MIN_WORKS || dont_nak) {
1225 p[2] = DEFLATE_MAKE_OPT(ho->deflate_size);
1230 p[2] = DEFLATE_MAKE_OPT(nb);
1235 case CI_BSD_COMPRESS:
1236 if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) {
1241 ho->bsd_compress = 1;
1242 ho->bsd_bits = nb = BSD_NBITS(p[2]);
1243 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
1244 || nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
1247 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
1248 /* fall through to test this #bits below */
1254 * Check whether we can do BSD-Compress with the code
1255 * size they want. If the code size is too big, reduce
1256 * it until the kernel can cope and nak with that.
1257 * We only check this for the first option.
1261 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1);
1264 if (res < 0 || nb == BSD_MIN_BITS || dont_nak) {
1266 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION,
1272 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
1277 case CI_PREDICTOR_1:
1278 if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) {
1283 ho->predictor_1 = 1;
1285 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
1290 case CI_PREDICTOR_2:
1291 if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) {
1296 ho->predictor_2 = 1;
1298 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
1308 if (newret == CONFNAK && dont_nak)
1310 if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) {
1311 /* we're returning this option */
1312 if (newret == CONFREJ && ret == CONFNAK)
1316 BCOPY(p, retp, clen);
1324 if (ret != CONFACK) {
1325 if (ret == CONFREJ && *lenp == retp - p0)
1326 all_rejected[f->unit] = 1;
1331 if (ret == CONFREJ && ao->mppe && rej_for_ci_mppe) {
1332 error("MPPE required but peer negotiation failed");
1333 lcp_close(f->unit, "MPPE required but peer negotiation failed");
1340 * Make a string name for a compression method (or 2).
1343 method_name(ccp_options *opt, ccp_options *opt2)
1345 static char result[64];
1347 if (!ANY_COMPRESS(*opt))
1349 switch (opt->method) {
1354 char *q = result + sizeof(result); /* 1 past result */
1356 slprintf(p, q - p, "MPPE ");
1358 if (opt->mppe & MPPE_OPT_128) {
1359 slprintf(p, q - p, "128-bit ");
1362 if (opt->mppe & MPPE_OPT_40) {
1363 slprintf(p, q - p, "40-bit ");
1366 if (opt->mppe & MPPE_OPT_STATEFUL)
1367 slprintf(p, q - p, "stateful");
1369 slprintf(p, q - p, "stateless");
1375 case CI_DEFLATE_DRAFT:
1376 if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
1377 slprintf(result, sizeof(result), "Deflate%s (%d/%d)",
1378 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1379 opt->deflate_size, opt2->deflate_size);
1381 slprintf(result, sizeof(result), "Deflate%s (%d)",
1382 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1385 case CI_BSD_COMPRESS:
1386 if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
1387 slprintf(result, sizeof(result), "BSD-Compress (%d/%d)",
1388 opt->bsd_bits, opt2->bsd_bits);
1390 slprintf(result, sizeof(result), "BSD-Compress (%d)",
1393 case CI_PREDICTOR_1:
1394 return "Predictor 1";
1395 case CI_PREDICTOR_2:
1396 return "Predictor 2";
1398 slprintf(result, sizeof(result), "Method %d", opt->method);
1404 * CCP has come up - inform the kernel driver and log a message.
1409 ccp_options *go = &ccp_gotoptions[f->unit];
1410 ccp_options *ho = &ccp_hisoptions[f->unit];
1413 ccp_flags_set(f->unit, 1, 1);
1414 if (ANY_COMPRESS(*go)) {
1415 if (ANY_COMPRESS(*ho)) {
1416 if (go->method == ho->method) {
1417 notice("%s compression enabled", method_name(go, ho));
1419 strlcpy(method1, method_name(go, NULL), sizeof(method1));
1420 notice("%s / %s compression enabled",
1421 method1, method_name(ho, NULL));
1424 notice("%s receive compression enabled", method_name(go, NULL));
1425 } else if (ANY_COMPRESS(*ho))
1426 notice("%s transmit compression enabled", method_name(ho, NULL));
1429 BZERO(mppe_recv_key, MPPE_MAX_KEY_LEN);
1430 BZERO(mppe_send_key, MPPE_MAX_KEY_LEN);
1431 continue_networks(f->unit); /* Bring up IP et al */
1437 * CCP has gone down - inform the kernel driver.
1442 if (ccp_localstate[f->unit] & RACK_PENDING)
1443 UNTIMEOUT(ccp_rack_timeout, f);
1444 ccp_localstate[f->unit] = 0;
1445 ccp_flags_set(f->unit, 1, 0);
1447 if (ccp_gotoptions[f->unit].mppe) {
1448 ccp_gotoptions[f->unit].mppe = 0;
1449 if (lcp_fsm[f->unit].state == OPENED) {
1450 /* If LCP is not already going down, make sure it does. */
1451 error("MPPE disabled");
1452 lcp_close(f->unit, "MPPE disabled");
1459 * Print the contents of a CCP packet.
1461 static char *ccp_codenames[] = {
1462 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1463 "TermReq", "TermAck", "CodeRej",
1464 NULL, NULL, NULL, NULL, NULL, NULL,
1465 "ResetReq", "ResetAck",
1469 ccp_printpkt(u_char *p, int plen,
1470 void (*printer) (void *, char *, ...), void *arg)
1472 u_char *p0, *optend;
1477 if (plen < HEADERLEN)
1481 len = (p[2] << 8) + p[3];
1482 if (len < HEADERLEN || len > plen)
1485 if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *)
1486 && ccp_codenames[code-1] != NULL)
1487 printer(arg, " %s", ccp_codenames[code-1]);
1489 printer(arg, " code=0x%x", code);
1490 printer(arg, " id=0x%x", id);
1499 /* print list of possible compression methods */
1503 if (optlen < 2 || optlen > len)
1507 optend = p + optlen;
1511 if (optlen >= CILEN_MPPE) {
1514 MPPE_CI_TO_OPTS(&p[2], mppe_opts);
1515 printer(arg, "mppe %s %s %s %s %s %s%s",
1516 (p[2] & MPPE_H_BIT)? "+H": "-H",
1517 (p[5] & MPPE_M_BIT)? "+M": "-M",
1518 (p[5] & MPPE_S_BIT)? "+S": "-S",
1519 (p[5] & MPPE_L_BIT)? "+L": "-L",
1520 (p[5] & MPPE_D_BIT)? "+D": "-D",
1521 (p[5] & MPPE_C_BIT)? "+C": "-C",
1522 (mppe_opts & MPPE_OPT_UNKNOWN)? " +U": "");
1523 if (mppe_opts & MPPE_OPT_UNKNOWN)
1524 printer(arg, " (%.2x %.2x %.2x %.2x)",
1525 p[2], p[3], p[4], p[5]);
1531 case CI_DEFLATE_DRAFT:
1532 if (optlen >= CILEN_DEFLATE) {
1533 printer(arg, "deflate%s %d",
1534 (code == CI_DEFLATE_DRAFT? "(old#)": ""),
1535 DEFLATE_SIZE(p[2]));
1536 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
1537 printer(arg, " method %d", DEFLATE_METHOD(p[2]));
1538 if (p[3] != DEFLATE_CHK_SEQUENCE)
1539 printer(arg, " check %d", p[3]);
1543 case CI_BSD_COMPRESS:
1544 if (optlen >= CILEN_BSD_COMPRESS) {
1545 printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
1547 p += CILEN_BSD_COMPRESS;
1550 case CI_PREDICTOR_1:
1551 if (optlen >= CILEN_PREDICTOR_1) {
1552 printer(arg, "predictor 1");
1553 p += CILEN_PREDICTOR_1;
1556 case CI_PREDICTOR_2:
1557 if (optlen >= CILEN_PREDICTOR_2) {
1558 printer(arg, "predictor 2");
1559 p += CILEN_PREDICTOR_2;
1564 printer(arg, " %.2x", *p++);
1571 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1572 print_string((char *)p, len, printer, arg);
1579 /* dump out the rest of the packet in hex */
1581 printer(arg, " %.2x", *p++);
1587 * We have received a packet that the decompressor failed to
1588 * decompress. Here we would expect to issue a reset-request, but
1589 * Motorola has a patent on resetting the compressor as a result of
1590 * detecting an error in the decompressed data after decompression.
1591 * (See US patent 5,130,993; international patent publication number
1592 * WO 91/10289; Australian patent 73296/91.)
1594 * So we ask the kernel whether the error was detected after
1595 * decompression; if it was, we take CCP down, thus disabling
1596 * compression :-(, otherwise we issue the reset-request.
1599 ccp_datainput(int unit, u_char *pkt, int len)
1604 if (f->state == OPENED) {
1605 if (ccp_fatal_error(unit)) {
1607 * Disable compression by taking CCP down.
1609 error("Lost compression sync: disabling compression");
1610 ccp_close(unit, "Lost compression sync");
1613 * If we were doing MPPE, we must also take the link down.
1615 if (ccp_gotoptions[unit].mppe) {
1616 error("Too many MPPE errors, closing LCP");
1617 lcp_close(unit, "Too many MPPE errors");
1622 * Send a reset-request to reset the peer's compressor.
1623 * We don't do that if we are still waiting for an
1624 * acknowledgement to a previous reset-request.
1626 if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
1627 fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
1628 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1629 ccp_localstate[f->unit] |= RACK_PENDING;
1631 ccp_localstate[f->unit] |= RREQ_REPEAT;
1637 * Timeout waiting for reset-ack.
1640 ccp_rack_timeout(void *arg)
1644 if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
1645 fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
1646 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1647 ccp_localstate[f->unit] &= ~RREQ_REPEAT;
1649 ccp_localstate[f->unit] &= ~RACK_PENDING;