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>
43 #include "lcp.h" /* lcp_close(), lcp_fsm */
47 * Unfortunately there is a bug in zlib which means that using a
48 * size of 8 (window size = 256) for Deflate compression will cause
49 * buffer overruns and kernel crashes in the deflate module.
50 * Until this is fixed we only accept sizes in the range 9 .. 15.
51 * Thanks to James Carlson for pointing this out.
53 #define DEFLATE_MIN_WORKS 9
56 * Command-line options.
58 static int setbsdcomp (char **);
59 static int setdeflate (char **);
60 static char bsd_value[8];
61 static char deflate_value[8];
67 bool refuse_mppe_stateful = 1; /* Allow stateful mode? */
70 static option_t ccp_option_list[] = {
71 { "noccp", o_bool, &ccp_protent.enabled_flag,
72 "Disable CCP negotiation" },
73 { "-ccp", o_bool, &ccp_protent.enabled_flag,
74 "Disable CCP negotiation", OPT_ALIAS },
76 { "bsdcomp", o_special, (void *)setbsdcomp,
77 "Request BSD-Compress packet compression",
78 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value },
79 { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
80 "don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR,
81 &ccp_allowoptions[0].bsd_compress },
82 { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
83 "don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
84 &ccp_allowoptions[0].bsd_compress },
86 { "deflate", o_special, (void *)setdeflate,
87 "request Deflate compression",
88 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value },
89 { "nodeflate", o_bool, &ccp_wantoptions[0].deflate,
90 "don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR,
91 &ccp_allowoptions[0].deflate },
92 { "-deflate", o_bool, &ccp_wantoptions[0].deflate,
93 "don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
94 &ccp_allowoptions[0].deflate },
96 { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft,
97 "don't use draft deflate #", OPT_A2COPY,
98 &ccp_allowoptions[0].deflate_draft },
100 { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
101 "request Predictor-1", OPT_PRIO | 1 },
102 { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1,
103 "don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR,
104 &ccp_allowoptions[0].predictor_1 },
105 { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
106 "don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
107 &ccp_allowoptions[0].predictor_1 },
110 /* MPPE options are symmetrical ... we only set wantoptions here */
111 { "require-mppe", o_bool, &ccp_wantoptions[0].mppe,
112 "require MPPE encryption",
113 OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
114 { "+mppe", o_bool, &ccp_wantoptions[0].mppe,
115 "require MPPE encryption",
116 OPT_ALIAS | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
117 { "nomppe", o_bool, &ccp_wantoptions[0].mppe,
118 "don't allow MPPE encryption", OPT_PRIO },
119 { "-mppe", o_bool, &ccp_wantoptions[0].mppe,
120 "don't allow MPPE encryption", OPT_ALIAS | OPT_PRIO },
122 /* We use ccp_allowoptions[0].mppe as a junk var ... it is reset later */
123 { "require-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
124 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
125 &ccp_wantoptions[0].mppe },
126 { "+mppe-40", o_bool, &ccp_allowoptions[0].mppe,
127 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
128 &ccp_wantoptions[0].mppe },
129 { "nomppe-40", o_bool, &ccp_allowoptions[0].mppe,
130 "don't allow MPPE 40-bit encryption",
131 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40, &ccp_wantoptions[0].mppe },
132 { "-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
133 "don't allow MPPE 40-bit encryption",
134 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40,
135 &ccp_wantoptions[0].mppe },
137 { "require-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
138 "require MPPE 128-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
139 &ccp_wantoptions[0].mppe },
140 { "+mppe-128", o_bool, &ccp_allowoptions[0].mppe,
141 "require MPPE 128-bit encryption",
142 OPT_ALIAS | OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
143 &ccp_wantoptions[0].mppe },
144 { "nomppe-128", o_bool, &ccp_allowoptions[0].mppe,
145 "don't allow MPPE 128-bit encryption",
146 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128, &ccp_wantoptions[0].mppe },
147 { "-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
148 "don't allow MPPE 128-bit encryption",
149 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128,
150 &ccp_wantoptions[0].mppe },
152 /* strange one; we always request stateless, but will we allow stateful? */
153 { "mppe-stateful", o_bool, &refuse_mppe_stateful,
154 "allow MPPE stateful mode", OPT_PRIO },
155 { "nomppe-stateful", o_bool, &refuse_mppe_stateful,
156 "disallow MPPE stateful mode", OPT_PRIO | 1 },
163 * Protocol entry points from main code.
165 static void ccp_init (int unit);
166 static void ccp_open (int unit);
167 static void ccp_close (int unit, char *);
168 static void ccp_lowerup (int unit);
169 static void ccp_lowerdown (int);
170 static void ccp_input (int unit, u_char *pkt, int len);
171 static void ccp_protrej (int unit);
172 static int ccp_printpkt (u_char *pkt, int len,
173 void (*printer)(void *, char *, ...),
175 static void ccp_datainput (int unit, u_char *pkt, int len);
177 struct protent ccp_protent = {
197 fsm ccp_fsm[NUM_PPP];
198 ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */
199 ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */
200 ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */
201 ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */
204 * Callbacks for fsm code.
206 static void ccp_resetci (fsm *);
207 static int ccp_cilen (fsm *);
208 static void ccp_addci (fsm *, u_char *, int *);
209 static int ccp_ackci (fsm *, u_char *, int);
210 static int ccp_nakci (fsm *, u_char *, int, int);
211 static int ccp_rejci (fsm *, u_char *, int);
212 static int ccp_reqci (fsm *, u_char *, int *, int);
213 static void ccp_up (fsm *);
214 static void ccp_down (fsm *);
215 static int ccp_extcode (fsm *, int, int, u_char *, int);
216 static void ccp_rack_timeout (void *);
217 static char *method_name (ccp_options *, ccp_options *);
219 static fsm_callbacks ccp_callbacks = {
238 * Do we want / did we get any compression?
240 #define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \
241 || (opt).predictor_1 || (opt).predictor_2 \
245 * Local state (mainly for handling reset-reqs and reset-acks).
247 static int ccp_localstate[NUM_PPP];
248 #define RACK_PENDING 1 /* waiting for reset-ack */
249 #define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
251 #define RACKTIMEOUT 1 /* second */
253 static int all_rejected[NUM_PPP]; /* we rejected all peer's options */
259 setbsdcomp(char **argv)
265 abits = rbits = strtol(str, &endp, 0);
266 if (endp != str && *endp == ',') {
268 abits = strtol(str, &endp, 0);
270 if (*endp != 0 || endp == str) {
271 option_error("invalid parameter '%s' for bsdcomp option", *argv);
274 if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS))
275 || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) {
276 option_error("bsdcomp option values must be 0 or %d .. %d",
277 BSD_MIN_BITS, BSD_MAX_BITS);
281 ccp_wantoptions[0].bsd_compress = 1;
282 ccp_wantoptions[0].bsd_bits = rbits;
284 ccp_wantoptions[0].bsd_compress = 0;
286 ccp_allowoptions[0].bsd_compress = 1;
287 ccp_allowoptions[0].bsd_bits = abits;
289 ccp_allowoptions[0].bsd_compress = 0;
290 slprintf(bsd_value, sizeof(bsd_value),
291 rbits == abits? "%d": "%d,%d", rbits, abits);
297 setdeflate(char **argv)
303 abits = rbits = strtol(str, &endp, 0);
304 if (endp != str && *endp == ',') {
306 abits = strtol(str, &endp, 0);
308 if (*endp != 0 || endp == str) {
309 option_error("invalid parameter '%s' for deflate option", *argv);
312 if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE))
313 || (abits != 0 && (abits < DEFLATE_MIN_SIZE
314 || abits > DEFLATE_MAX_SIZE))) {
315 option_error("deflate option values must be 0 or %d .. %d",
316 DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE);
319 if (rbits == DEFLATE_MIN_SIZE || abits == DEFLATE_MIN_SIZE) {
320 if (rbits == DEFLATE_MIN_SIZE)
321 rbits = DEFLATE_MIN_WORKS;
322 if (abits == DEFLATE_MIN_SIZE)
323 abits = DEFLATE_MIN_WORKS;
324 warn("deflate option value of %d changed to %d to avoid zlib bug",
325 DEFLATE_MIN_SIZE, DEFLATE_MIN_WORKS);
328 ccp_wantoptions[0].deflate = 1;
329 ccp_wantoptions[0].deflate_size = rbits;
331 ccp_wantoptions[0].deflate = 0;
333 ccp_allowoptions[0].deflate = 1;
334 ccp_allowoptions[0].deflate_size = abits;
336 ccp_allowoptions[0].deflate = 0;
337 slprintf(deflate_value, sizeof(deflate_value),
338 rbits == abits? "%d": "%d,%d", rbits, abits);
344 * ccp_init - initialize CCP.
349 fsm *f = &ccp_fsm[unit];
352 f->protocol = PPP_CCP;
353 f->callbacks = &ccp_callbacks;
356 memset(&ccp_wantoptions[unit], 0, sizeof(ccp_options));
357 memset(&ccp_gotoptions[unit], 0, sizeof(ccp_options));
358 memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
359 memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
361 ccp_wantoptions[0].deflate = 1;
362 ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE;
363 ccp_wantoptions[0].deflate_correct = 1;
364 ccp_wantoptions[0].deflate_draft = 1;
365 ccp_allowoptions[0].deflate = 1;
366 ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE;
367 ccp_allowoptions[0].deflate_correct = 1;
368 ccp_allowoptions[0].deflate_draft = 1;
370 ccp_wantoptions[0].bsd_compress = 1;
371 ccp_wantoptions[0].bsd_bits = BSD_MAX_BITS;
372 ccp_allowoptions[0].bsd_compress = 1;
373 ccp_allowoptions[0].bsd_bits = BSD_MAX_BITS;
375 ccp_allowoptions[0].predictor_1 = 1;
379 * ccp_open - CCP is allowed to come up.
384 fsm *f = &ccp_fsm[unit];
386 if (f->state != OPENED)
387 ccp_flags_set(unit, 1, 0);
390 * Find out which compressors the kernel supports before
391 * deciding whether to open in silent mode.
394 if (!ANY_COMPRESS(ccp_gotoptions[unit]))
395 f->flags |= OPT_SILENT;
401 * ccp_close - Terminate CCP.
404 ccp_close(int unit, char *reason)
406 ccp_flags_set(unit, 0, 0);
407 fsm_close(&ccp_fsm[unit], reason);
411 * ccp_lowerup - we may now transmit CCP packets.
414 ccp_lowerup(int unit)
416 fsm_lowerup(&ccp_fsm[unit]);
420 * ccp_lowerdown - we may not transmit CCP packets.
423 ccp_lowerdown(int unit)
425 fsm_lowerdown(&ccp_fsm[unit]);
429 * ccp_input - process a received CCP packet.
432 ccp_input(int unit, u_char *p, int len)
434 fsm *f = &ccp_fsm[unit];
438 * Check for a terminate-request so we can print a message.
441 fsm_input(f, p, len);
442 if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED) {
443 notice("Compression disabled by peer.");
445 if (ccp_gotoptions[unit].mppe) {
446 error("MPPE disabled, closing LCP");
447 lcp_close(unit, "MPPE disabled by peer");
453 * If we get a terminate-ack and we're not asking for compression,
456 if (oldstate == REQSENT && p[0] == TERMACK
457 && !ANY_COMPRESS(ccp_gotoptions[unit]))
458 ccp_close(unit, "No compression negotiated");
462 * Handle a CCP-specific code.
465 ccp_extcode(fsm *f, int code, int id, u_char *p, int len)
469 if (f->state != OPENED)
471 /* send a reset-ack, which the transmitter will see and
472 reset its compression state. */
473 fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
477 if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) {
478 ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT);
479 UNTIMEOUT(ccp_rack_timeout, f);
491 * ccp_protrej - peer doesn't talk CCP.
494 ccp_protrej(int unit)
496 ccp_flags_set(unit, 0, 0);
497 fsm_lowerdown(&ccp_fsm[unit]);
500 if (ccp_gotoptions[unit].mppe) {
501 error("MPPE required but peer negotiation failed");
502 lcp_close(unit, "MPPE required but peer negotiation failed");
509 * ccp_resetci - initialize at start of negotiation.
514 ccp_options *go = &ccp_gotoptions[f->unit];
515 u_char opt_buf[CCP_MAX_OPTION_LENGTH];
517 *go = ccp_wantoptions[f->unit];
518 all_rejected[f->unit] = 0;
522 ccp_options *ao = &ccp_allowoptions[f->unit];
523 int auth_mschap_bits = auth_done[f->unit];
525 int auth_eap_bits = auth_done[f->unit];
530 * Start with a basic sanity check: mschap[v2] auth must be in
531 * exactly one direction. RFC 3079 says that the keys are
532 * 'derived from the credentials of the peer that initiated the call',
533 * however the PPP protocol doesn't have such a concept, and pppd
534 * cannot get this info externally. Instead we do the best we can.
535 * NB: If MPPE is required, all other compression opts are invalid.
536 * So, we return right away if we can't do it.
539 /* Leave only the mschap auth bits set */
540 auth_mschap_bits &= (CHAP_MS_WITHPEER | CHAP_MS_PEER |
541 CHAP_MS2_WITHPEER | CHAP_MS2_PEER);
542 /* Count the mschap auths */
543 auth_mschap_bits >>= CHAP_MS_SHIFT;
546 numbits += auth_mschap_bits & 1;
547 auth_mschap_bits >>= 1;
548 } while (auth_mschap_bits);
550 error("MPPE required, but auth done in both directions.");
551 lcp_close(f->unit, "MPPE required but not available");
557 * MPPE is also possible in combination with EAP-TLS.
558 * It is not possible to detect if we're doing EAP or EAP-TLS
559 * at this stage, hence we accept all forms of EAP. If TLS is
560 * not used then the MPPE keys will not be derived anyway.
562 /* Leave only the eap auth bits set */
563 auth_eap_bits &= (EAP_WITHPEER | EAP_PEER );
565 if ((numbits == 0) && (auth_eap_bits == 0)) {
566 error("MPPE required, but MS-CHAP[v2] nor EAP-TLS auth are performed.");
569 error("MPPE required, but MS-CHAP[v2] auth not performed.");
571 lcp_close(f->unit, "MPPE required but not available");
575 /* A plugin (eg radius) may not have obtained key material. */
576 if (!mppe_keys_isset()) {
577 error("MPPE required, but keys are not available. "
578 "Possible plugin problem?");
579 lcp_close(f->unit, "MPPE required but not available");
583 /* LM auth not supported for MPPE */
584 if (auth_done[f->unit] & (CHAP_MS_WITHPEER | CHAP_MS_PEER)) {
585 /* This might be noise */
586 if (go->mppe & MPPE_OPT_40) {
587 notice("Disabling 40-bit MPPE; MS-CHAP LM not supported");
588 go->mppe &= ~MPPE_OPT_40;
589 ccp_wantoptions[f->unit].mppe &= ~MPPE_OPT_40;
593 /* Last check: can we actually negotiate something? */
594 if (!(go->mppe & (MPPE_OPT_40 | MPPE_OPT_128))) {
595 /* Could be misconfig, could be 40-bit disabled above. */
596 error("MPPE required, but both 40-bit and 128-bit disabled.");
597 lcp_close(f->unit, "MPPE required but not available");
603 /* MPPE is not compatible with other compression types */
604 ao->bsd_compress = go->bsd_compress = 0;
605 ao->predictor_1 = go->predictor_1 = 0;
606 ao->predictor_2 = go->predictor_2 = 0;
607 ao->deflate = go->deflate = 0;
612 * Check whether the kernel knows about the various
613 * compression methods we might request.
617 opt_buf[0] = CI_MPPE;
618 opt_buf[1] = CILEN_MPPE;
619 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
620 /* Key material unimportant here. */
621 if (ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0) <= 0) {
622 error("MPPE required, but kernel has no support.");
623 lcp_close(f->unit, "MPPE required but not available");
627 if (go->bsd_compress) {
628 opt_buf[0] = CI_BSD_COMPRESS;
629 opt_buf[1] = CILEN_BSD_COMPRESS;
630 opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS);
631 if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0)
632 go->bsd_compress = 0;
635 if (go->deflate_correct) {
636 opt_buf[0] = CI_DEFLATE;
637 opt_buf[1] = CILEN_DEFLATE;
638 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
639 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
640 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
641 go->deflate_correct = 0;
643 if (go->deflate_draft) {
644 opt_buf[0] = CI_DEFLATE_DRAFT;
645 opt_buf[1] = CILEN_DEFLATE;
646 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
647 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
648 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
649 go->deflate_draft = 0;
651 if (!go->deflate_correct && !go->deflate_draft)
654 if (go->predictor_1) {
655 opt_buf[0] = CI_PREDICTOR_1;
656 opt_buf[1] = CILEN_PREDICTOR_1;
657 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
660 if (go->predictor_2) {
661 opt_buf[0] = CI_PREDICTOR_2;
662 opt_buf[1] = CILEN_PREDICTOR_2;
663 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
669 * ccp_cilen - Return total length of our configuration info.
674 ccp_options *go = &ccp_gotoptions[f->unit];
676 return (go->bsd_compress? CILEN_BSD_COMPRESS: 0)
677 + (go->deflate && go->deflate_correct? CILEN_DEFLATE: 0)
678 + (go->deflate && go->deflate_draft? CILEN_DEFLATE: 0)
679 + (go->predictor_1? CILEN_PREDICTOR_1: 0)
680 + (go->predictor_2? CILEN_PREDICTOR_2: 0)
681 + (go->mppe? CILEN_MPPE: 0);
685 * ccp_addci - put our requests in a packet.
688 ccp_addci(fsm *f, u_char *p, int *lenp)
691 ccp_options *go = &ccp_gotoptions[f->unit];
695 * Add the compression types that we can receive, in decreasing
696 * preference order. Get the kernel to allocate the first one
697 * in case it gets Acked.
701 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
703 p[0] = opt_buf[0] = CI_MPPE;
704 p[1] = opt_buf[1] = CILEN_MPPE;
705 MPPE_OPTS_TO_CI(go->mppe, &p[2]);
706 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
707 mppe_get_recv_key(&opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
708 res = ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0);
712 /* This shouldn't happen, we've already tested it! */
713 lcp_close(f->unit, "MPPE required but not available in kernel");
717 p[0] = go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT;
718 p[1] = CILEN_DEFLATE;
719 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
720 p[3] = DEFLATE_CHK_SEQUENCE;
725 if (go->deflate_size < DEFLATE_MIN_WORKS) {
729 res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
733 } else if (res < 0) {
738 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
741 if (p != p0 && go->deflate_correct && go->deflate_draft) {
742 p[0] = CI_DEFLATE_DRAFT;
743 p[1] = CILEN_DEFLATE;
744 p[2] = p[2 - CILEN_DEFLATE];
745 p[3] = DEFLATE_CHK_SEQUENCE;
749 if (go->bsd_compress) {
750 p[0] = CI_BSD_COMPRESS;
751 p[1] = CILEN_BSD_COMPRESS;
752 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
754 p += CILEN_BSD_COMPRESS; /* not the first option */
757 if (go->bsd_bits < BSD_MIN_BITS) {
758 go->bsd_compress = 0;
761 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0);
763 p += CILEN_BSD_COMPRESS;
765 } else if (res < 0) {
766 go->bsd_compress = 0;
770 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
774 /* XXX Should Predictor 2 be preferable to Predictor 1? */
775 if (go->predictor_1) {
776 p[0] = CI_PREDICTOR_1;
777 p[1] = CILEN_PREDICTOR_1;
778 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) {
781 p += CILEN_PREDICTOR_1;
784 if (go->predictor_2) {
785 p[0] = CI_PREDICTOR_2;
786 p[1] = CILEN_PREDICTOR_2;
787 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) {
790 p += CILEN_PREDICTOR_2;
794 go->method = (p > p0)? p0[0]: -1;
800 * ccp_ackci - process a received configure-ack, and return
801 * 1 iff the packet was OK.
804 ccp_ackci(fsm *f, u_char *p, int len)
806 ccp_options *go = &ccp_gotoptions[f->unit];
811 u_char opt_buf[CILEN_MPPE];
813 opt_buf[0] = CI_MPPE;
814 opt_buf[1] = CILEN_MPPE;
815 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
816 if (len < CILEN_MPPE || memcmp(opt_buf, p, CILEN_MPPE))
820 /* XXX Cope with first/fast ack */
826 if (len < CILEN_DEFLATE
827 || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
828 || p[1] != CILEN_DEFLATE
829 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
830 || p[3] != DEFLATE_CHK_SEQUENCE)
833 len -= CILEN_DEFLATE;
834 /* XXX Cope with first/fast ack */
837 if (go->deflate_correct && go->deflate_draft) {
838 if (len < CILEN_DEFLATE
839 || p[0] != CI_DEFLATE_DRAFT
840 || p[1] != CILEN_DEFLATE
841 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
842 || p[3] != DEFLATE_CHK_SEQUENCE)
845 len -= CILEN_DEFLATE;
848 if (go->bsd_compress) {
849 if (len < CILEN_BSD_COMPRESS
850 || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
851 || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
853 p += CILEN_BSD_COMPRESS;
854 len -= CILEN_BSD_COMPRESS;
855 /* XXX Cope with first/fast ack */
856 if (p == p0 && len == 0)
859 if (go->predictor_1) {
860 if (len < CILEN_PREDICTOR_1
861 || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
863 p += CILEN_PREDICTOR_1;
864 len -= CILEN_PREDICTOR_1;
865 /* XXX Cope with first/fast ack */
866 if (p == p0 && len == 0)
869 if (go->predictor_2) {
870 if (len < CILEN_PREDICTOR_2
871 || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
873 p += CILEN_PREDICTOR_2;
874 len -= CILEN_PREDICTOR_2;
875 /* XXX Cope with first/fast ack */
876 if (p == p0 && len == 0)
886 * ccp_nakci - process received configure-nak.
887 * Returns 1 iff the nak was OK.
890 ccp_nakci(fsm *f, u_char *p, int len, int treat_as_reject)
892 ccp_options *go = &ccp_gotoptions[f->unit];
893 ccp_options no; /* options we've seen already */
894 ccp_options try; /* options to ask for next time */
896 memset(&no, 0, sizeof(no));
900 if (go->mppe && len >= CILEN_MPPE
901 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
904 * Peer wants us to use a different strength or other setting.
905 * Fail if we aren't willing to use his suggestion.
907 MPPE_CI_TO_OPTS(&p[2], try.mppe);
908 if ((try.mppe & MPPE_OPT_STATEFUL) && refuse_mppe_stateful) {
909 error("Refusing MPPE stateful mode offered by peer");
911 } else if (((go->mppe | MPPE_OPT_STATEFUL) & try.mppe) != try.mppe) {
912 /* Peer must have set options we didn't request (suggest) */
917 error("MPPE required but peer negotiation failed");
918 lcp_close(f->unit, "MPPE required but peer negotiation failed");
922 if (go->deflate && len >= CILEN_DEFLATE
923 && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
924 && p[1] == CILEN_DEFLATE) {
927 * Peer wants us to use a different code size or something.
928 * Stop asking for Deflate if we don't understand his suggestion.
930 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
931 || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_WORKS
932 || p[3] != DEFLATE_CHK_SEQUENCE)
934 else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
935 try.deflate_size = DEFLATE_SIZE(p[2]);
937 len -= CILEN_DEFLATE;
938 if (go->deflate_correct && go->deflate_draft
939 && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
940 && p[1] == CILEN_DEFLATE) {
942 len -= CILEN_DEFLATE;
946 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
947 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
950 * Peer wants us to use a different number of bits
951 * or a different version.
953 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
954 try.bsd_compress = 0;
955 else if (BSD_NBITS(p[2]) < go->bsd_bits)
956 try.bsd_bits = BSD_NBITS(p[2]);
957 p += CILEN_BSD_COMPRESS;
958 len -= CILEN_BSD_COMPRESS;
962 * Predictor-1 and 2 have no options, so they can't be Naked.
964 * There may be remaining options but we ignore them.
967 if (f->state != OPENED)
973 * ccp_rejci - reject some of our suggested compression methods.
976 ccp_rejci(fsm *f, u_char *p, int len)
978 ccp_options *go = &ccp_gotoptions[f->unit];
979 ccp_options try; /* options to request next time */
984 * Cope with empty configure-rejects by ceasing to send
985 * configure-requests.
987 if (len == 0 && all_rejected[f->unit])
991 if (go->mppe && len >= CILEN_MPPE
992 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
993 error("MPPE required but peer refused");
994 lcp_close(f->unit, "MPPE required but peer refused");
999 if (go->deflate_correct && len >= CILEN_DEFLATE
1000 && p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
1001 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1002 || p[3] != DEFLATE_CHK_SEQUENCE)
1003 return 0; /* Rej is bad */
1004 try.deflate_correct = 0;
1006 len -= CILEN_DEFLATE;
1008 if (go->deflate_draft && len >= CILEN_DEFLATE
1009 && p[0] == CI_DEFLATE_DRAFT && p[1] == CILEN_DEFLATE) {
1010 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1011 || p[3] != DEFLATE_CHK_SEQUENCE)
1012 return 0; /* Rej is bad */
1013 try.deflate_draft = 0;
1015 len -= CILEN_DEFLATE;
1017 if (!try.deflate_correct && !try.deflate_draft)
1019 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
1020 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
1021 if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
1023 try.bsd_compress = 0;
1024 p += CILEN_BSD_COMPRESS;
1025 len -= CILEN_BSD_COMPRESS;
1027 if (go->predictor_1 && len >= CILEN_PREDICTOR_1
1028 && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
1029 try.predictor_1 = 0;
1030 p += CILEN_PREDICTOR_1;
1031 len -= CILEN_PREDICTOR_1;
1033 if (go->predictor_2 && len >= CILEN_PREDICTOR_2
1034 && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
1035 try.predictor_2 = 0;
1036 p += CILEN_PREDICTOR_2;
1037 len -= CILEN_PREDICTOR_2;
1043 if (f->state != OPENED)
1050 * ccp_reqci - processed a received configure-request.
1051 * Returns CONFACK, CONFNAK or CONFREJ and the packet modified
1055 ccp_reqci(fsm *f, u_char *p, int *lenp, int dont_nak)
1057 int ret, newret, res;
1059 int len, clen, type, nb;
1060 ccp_options *ho = &ccp_hisoptions[f->unit];
1061 ccp_options *ao = &ccp_allowoptions[f->unit];
1063 bool rej_for_ci_mppe = 1; /* Are we rejecting based on a bad/missing */
1064 /* CI_MPPE, or due to other options? */
1071 memset(ho, 0, sizeof(ccp_options));
1072 ho->method = (len > 0)? p[0]: -1;
1076 if (len < 2 || p[1] < 2 || p[1] > len) {
1088 if (!ao->mppe || clen != CILEN_MPPE) {
1092 MPPE_CI_TO_OPTS(&p[2], ho->mppe);
1094 /* Nak if anything unsupported or unknown are set. */
1095 if (ho->mppe & MPPE_OPT_UNSUPPORTED) {
1097 ho->mppe &= ~MPPE_OPT_UNSUPPORTED;
1099 if (ho->mppe & MPPE_OPT_UNKNOWN) {
1101 ho->mppe &= ~MPPE_OPT_UNKNOWN;
1104 /* Check state opt */
1105 if (ho->mppe & MPPE_OPT_STATEFUL) {
1107 * We can Nak and request stateless, but it's a
1108 * lot easier to just assume the peer will request
1109 * it if he can do it; stateful mode is bad over
1110 * the Internet -- which is where we expect MPPE.
1112 if (refuse_mppe_stateful) {
1113 error("Refusing MPPE stateful mode offered by peer");
1119 /* Find out which of {S,L} are set. */
1120 if ((ho->mppe & MPPE_OPT_128)
1121 && (ho->mppe & MPPE_OPT_40)) {
1122 /* Both are set, negotiate the strongest. */
1124 if (ao->mppe & MPPE_OPT_128)
1125 ho->mppe &= ~MPPE_OPT_40;
1126 else if (ao->mppe & MPPE_OPT_40)
1127 ho->mppe &= ~MPPE_OPT_128;
1132 } else if (ho->mppe & MPPE_OPT_128) {
1133 if (!(ao->mppe & MPPE_OPT_128)) {
1137 } else if (ho->mppe & MPPE_OPT_40) {
1138 if (!(ao->mppe & MPPE_OPT_40)) {
1143 /* Neither are set. */
1144 /* We cannot accept this. */
1146 /* Give the peer our idea of what can be used,
1147 so it can choose and confirm */
1148 ho->mppe = ao->mppe;
1151 /* rebuild the opts */
1152 MPPE_OPTS_TO_CI(ho->mppe, &p[2]);
1153 if (newret == CONFACK) {
1154 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
1157 BCOPY(p, opt_buf, CILEN_MPPE);
1158 mppe_get_send_key(&opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
1159 if (ccp_test(f->unit, opt_buf,
1160 CILEN_MPPE + MPPE_MAX_KEY_LEN, 1) <= 0) {
1161 /* This shouldn't happen, we've already tested it! */
1162 error("MPPE required, but kernel has no support.");
1163 lcp_close(f->unit, "MPPE required but not available");
1168 * We need to decrease the interface MTU by MPPE_PAD
1169 * because MPPE frames **grow**. The kernel [must]
1170 * allocate MPPE_PAD extra bytes in xmit buffers.
1172 mtu = netif_get_mtu(f->unit);
1174 netif_set_mtu(f->unit, mtu - MPPE_PAD);
1180 * We have accepted MPPE or are willing to negotiate
1181 * MPPE parameters. A CONFREJ is due to subsequent
1182 * (non-MPPE) processing.
1184 rej_for_ci_mppe = 0;
1188 case CI_DEFLATE_DRAFT:
1189 if (!ao->deflate || clen != CILEN_DEFLATE
1190 || (!ao->deflate_correct && type == CI_DEFLATE)
1191 || (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) {
1197 ho->deflate_size = nb = DEFLATE_SIZE(p[2]);
1198 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
1199 || p[3] != DEFLATE_CHK_SEQUENCE
1200 || nb > ao->deflate_size || nb < DEFLATE_MIN_WORKS) {
1203 p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
1204 p[3] = DEFLATE_CHK_SEQUENCE;
1205 /* fall through to test this #bits below */
1211 * Check whether we can do Deflate with the window
1212 * size they want. If the window is too big, reduce
1213 * it until the kernel can cope and nak with that.
1214 * We only check this for the first option.
1218 res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
1220 break; /* it's OK now */
1221 if (res < 0 || nb == DEFLATE_MIN_WORKS || dont_nak) {
1223 p[2] = DEFLATE_MAKE_OPT(ho->deflate_size);
1228 p[2] = DEFLATE_MAKE_OPT(nb);
1233 case CI_BSD_COMPRESS:
1234 if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) {
1239 ho->bsd_compress = 1;
1240 ho->bsd_bits = nb = BSD_NBITS(p[2]);
1241 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
1242 || nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
1245 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
1246 /* fall through to test this #bits below */
1252 * Check whether we can do BSD-Compress with the code
1253 * size they want. If the code size is too big, reduce
1254 * it until the kernel can cope and nak with that.
1255 * We only check this for the first option.
1259 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1);
1262 if (res < 0 || nb == BSD_MIN_BITS || dont_nak) {
1264 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION,
1270 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
1275 case CI_PREDICTOR_1:
1276 if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) {
1281 ho->predictor_1 = 1;
1283 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
1288 case CI_PREDICTOR_2:
1289 if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) {
1294 ho->predictor_2 = 1;
1296 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
1306 if (newret == CONFNAK && dont_nak)
1308 if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) {
1309 /* we're returning this option */
1310 if (newret == CONFREJ && ret == CONFNAK)
1314 BCOPY(p, retp, clen);
1322 if (ret != CONFACK) {
1323 if (ret == CONFREJ && *lenp == retp - p0)
1324 all_rejected[f->unit] = 1;
1329 if (ret == CONFREJ && ao->mppe && rej_for_ci_mppe) {
1330 error("MPPE required but peer negotiation failed");
1331 lcp_close(f->unit, "MPPE required but peer negotiation failed");
1338 * Make a string name for a compression method (or 2).
1341 method_name(ccp_options *opt, ccp_options *opt2)
1343 static char result[64];
1345 if (!ANY_COMPRESS(*opt))
1347 switch (opt->method) {
1352 char *q = result + sizeof(result); /* 1 past result */
1354 slprintf(p, q - p, "MPPE ");
1356 if (opt->mppe & MPPE_OPT_128) {
1357 slprintf(p, q - p, "128-bit ");
1360 if (opt->mppe & MPPE_OPT_40) {
1361 slprintf(p, q - p, "40-bit ");
1364 if (opt->mppe & MPPE_OPT_STATEFUL)
1365 slprintf(p, q - p, "stateful");
1367 slprintf(p, q - p, "stateless");
1373 case CI_DEFLATE_DRAFT:
1374 if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
1375 slprintf(result, sizeof(result), "Deflate%s (%d/%d)",
1376 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1377 opt->deflate_size, opt2->deflate_size);
1379 slprintf(result, sizeof(result), "Deflate%s (%d)",
1380 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1383 case CI_BSD_COMPRESS:
1384 if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
1385 slprintf(result, sizeof(result), "BSD-Compress (%d/%d)",
1386 opt->bsd_bits, opt2->bsd_bits);
1388 slprintf(result, sizeof(result), "BSD-Compress (%d)",
1391 case CI_PREDICTOR_1:
1392 return "Predictor 1";
1393 case CI_PREDICTOR_2:
1394 return "Predictor 2";
1396 slprintf(result, sizeof(result), "Method %d", opt->method);
1402 * CCP has come up - inform the kernel driver and log a message.
1407 ccp_options *go = &ccp_gotoptions[f->unit];
1408 ccp_options *ho = &ccp_hisoptions[f->unit];
1411 ccp_flags_set(f->unit, 1, 1);
1412 if (ANY_COMPRESS(*go)) {
1413 if (ANY_COMPRESS(*ho)) {
1414 if (go->method == ho->method) {
1415 notice("%s compression enabled", method_name(go, ho));
1417 strlcpy(method1, method_name(go, NULL), sizeof(method1));
1418 notice("%s / %s compression enabled",
1419 method1, method_name(ho, NULL));
1422 notice("%s receive compression enabled", method_name(go, NULL));
1423 } else if (ANY_COMPRESS(*ho))
1424 notice("%s transmit compression enabled", method_name(ho, NULL));
1428 continue_networks(f->unit); /* Bring up IP et al */
1434 * CCP has gone down - inform the kernel driver.
1439 if (ccp_localstate[f->unit] & RACK_PENDING)
1440 UNTIMEOUT(ccp_rack_timeout, f);
1441 ccp_localstate[f->unit] = 0;
1442 ccp_flags_set(f->unit, 1, 0);
1444 if (ccp_gotoptions[f->unit].mppe) {
1445 ccp_gotoptions[f->unit].mppe = 0;
1446 if (lcp_fsm[f->unit].state == OPENED) {
1447 /* If LCP is not already going down, make sure it does. */
1448 error("MPPE disabled");
1449 lcp_close(f->unit, "MPPE disabled");
1456 * Print the contents of a CCP packet.
1458 static char *ccp_codenames[] = {
1459 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1460 "TermReq", "TermAck", "CodeRej",
1461 NULL, NULL, NULL, NULL, NULL, NULL,
1462 "ResetReq", "ResetAck",
1466 ccp_printpkt(u_char *p, int plen,
1467 void (*printer) (void *, char *, ...), void *arg)
1469 u_char *p0, *optend;
1474 if (plen < HEADERLEN)
1478 len = (p[2] << 8) + p[3];
1479 if (len < HEADERLEN || len > plen)
1482 if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *)
1483 && ccp_codenames[code-1] != NULL)
1484 printer(arg, " %s", ccp_codenames[code-1]);
1486 printer(arg, " code=0x%x", code);
1487 printer(arg, " id=0x%x", id);
1496 /* print list of possible compression methods */
1500 if (optlen < 2 || optlen > len)
1504 optend = p + optlen;
1508 if (optlen >= CILEN_MPPE) {
1511 MPPE_CI_TO_OPTS(&p[2], mppe_opts);
1512 printer(arg, "mppe %s %s %s %s %s %s%s",
1513 (p[2] & MPPE_H_BIT)? "+H": "-H",
1514 (p[5] & MPPE_M_BIT)? "+M": "-M",
1515 (p[5] & MPPE_S_BIT)? "+S": "-S",
1516 (p[5] & MPPE_L_BIT)? "+L": "-L",
1517 (p[5] & MPPE_D_BIT)? "+D": "-D",
1518 (p[5] & MPPE_C_BIT)? "+C": "-C",
1519 (mppe_opts & MPPE_OPT_UNKNOWN)? " +U": "");
1520 if (mppe_opts & MPPE_OPT_UNKNOWN)
1521 printer(arg, " (%.2x %.2x %.2x %.2x)",
1522 p[2], p[3], p[4], p[5]);
1528 case CI_DEFLATE_DRAFT:
1529 if (optlen >= CILEN_DEFLATE) {
1530 printer(arg, "deflate%s %d",
1531 (code == CI_DEFLATE_DRAFT? "(old#)": ""),
1532 DEFLATE_SIZE(p[2]));
1533 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
1534 printer(arg, " method %d", DEFLATE_METHOD(p[2]));
1535 if (p[3] != DEFLATE_CHK_SEQUENCE)
1536 printer(arg, " check %d", p[3]);
1540 case CI_BSD_COMPRESS:
1541 if (optlen >= CILEN_BSD_COMPRESS) {
1542 printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
1544 p += CILEN_BSD_COMPRESS;
1547 case CI_PREDICTOR_1:
1548 if (optlen >= CILEN_PREDICTOR_1) {
1549 printer(arg, "predictor 1");
1550 p += CILEN_PREDICTOR_1;
1553 case CI_PREDICTOR_2:
1554 if (optlen >= CILEN_PREDICTOR_2) {
1555 printer(arg, "predictor 2");
1556 p += CILEN_PREDICTOR_2;
1561 printer(arg, " %.2x", *p++);
1568 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1569 print_string((char *)p, len, printer, arg);
1576 /* dump out the rest of the packet in hex */
1578 printer(arg, " %.2x", *p++);
1584 * We have received a packet that the decompressor failed to
1585 * decompress. Here we would expect to issue a reset-request, but
1586 * Motorola has a patent on resetting the compressor as a result of
1587 * detecting an error in the decompressed data after decompression.
1588 * (See US patent 5,130,993; international patent publication number
1589 * WO 91/10289; Australian patent 73296/91.)
1591 * So we ask the kernel whether the error was detected after
1592 * decompression; if it was, we take CCP down, thus disabling
1593 * compression :-(, otherwise we issue the reset-request.
1596 ccp_datainput(int unit, u_char *pkt, int len)
1601 if (f->state == OPENED) {
1602 if (ccp_fatal_error(unit)) {
1604 * Disable compression by taking CCP down.
1606 error("Lost compression sync: disabling compression");
1607 ccp_close(unit, "Lost compression sync");
1610 * If we were doing MPPE, we must also take the link down.
1612 if (ccp_gotoptions[unit].mppe) {
1613 error("Too many MPPE errors, closing LCP");
1614 lcp_close(unit, "Too many MPPE errors");
1619 * Send a reset-request to reset the peer's compressor.
1620 * We don't do that if we are still waiting for an
1621 * acknowledgement to a previous reset-request.
1623 if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
1624 fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
1625 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1626 ccp_localstate[f->unit] |= RACK_PENDING;
1628 ccp_localstate[f->unit] |= RREQ_REPEAT;
1634 * Timeout waiting for reset-ack.
1637 ccp_rack_timeout(void *arg)
1641 if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
1642 fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
1643 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1644 ccp_localstate[f->unit] &= ~RREQ_REPEAT;
1646 ccp_localstate[f->unit] &= ~RACK_PENDING;