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@ozlabs.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.
35 #define RCSID "$Id: ccp.c,v 1.50 2005/06/26 19:34:41 carlsonj Exp $"
40 #include <net/ppp-comp.h>
42 #include <linux/ppp-comp.h>
45 #include "pppd-private.h"
52 #include "lcp.h" /* lcp_close(), lcp_fsm */
56 * Unfortunately there is a bug in zlib which means that using a
57 * size of 8 (window size = 256) for Deflate compression will cause
58 * buffer overruns and kernel crashes in the deflate module.
59 * Until this is fixed we only accept sizes in the range 9 .. 15.
60 * Thanks to James Carlson for pointing this out.
62 #define DEFLATE_MIN_WORKS 9
65 * Command-line options.
67 static int setbsdcomp (char **);
68 static int setdeflate (char **);
69 static char bsd_value[8];
70 static char deflate_value[8];
76 bool refuse_mppe_stateful = 1; /* Allow stateful mode? */
79 static struct option ccp_option_list[] = {
80 { "noccp", o_bool, &ccp_protent.enabled_flag,
81 "Disable CCP negotiation" },
82 { "-ccp", o_bool, &ccp_protent.enabled_flag,
83 "Disable CCP negotiation", OPT_ALIAS },
85 { "bsdcomp", o_special, (void *)setbsdcomp,
86 "Request BSD-Compress packet compression",
87 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value },
88 { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
89 "don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR,
90 &ccp_allowoptions[0].bsd_compress },
91 { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
92 "don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
93 &ccp_allowoptions[0].bsd_compress },
95 { "deflate", o_special, (void *)setdeflate,
96 "request Deflate compression",
97 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value },
98 { "nodeflate", o_bool, &ccp_wantoptions[0].deflate,
99 "don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR,
100 &ccp_allowoptions[0].deflate },
101 { "-deflate", o_bool, &ccp_wantoptions[0].deflate,
102 "don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
103 &ccp_allowoptions[0].deflate },
105 { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft,
106 "don't use draft deflate #", OPT_A2COPY,
107 &ccp_allowoptions[0].deflate_draft },
109 { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
110 "request Predictor-1", OPT_PRIO | 1 },
111 { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1,
112 "don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR,
113 &ccp_allowoptions[0].predictor_1 },
114 { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
115 "don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
116 &ccp_allowoptions[0].predictor_1 },
119 /* MPPE options are symmetrical ... we only set wantoptions here */
120 { "require-mppe", o_bool, &ccp_wantoptions[0].mppe,
121 "require MPPE encryption",
122 OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
123 { "+mppe", o_bool, &ccp_wantoptions[0].mppe,
124 "require MPPE encryption",
125 OPT_ALIAS | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
126 { "nomppe", o_bool, &ccp_wantoptions[0].mppe,
127 "don't allow MPPE encryption", OPT_PRIO },
128 { "-mppe", o_bool, &ccp_wantoptions[0].mppe,
129 "don't allow MPPE encryption", OPT_ALIAS | OPT_PRIO },
131 /* We use ccp_allowoptions[0].mppe as a junk var ... it is reset later */
132 { "require-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
133 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
134 &ccp_wantoptions[0].mppe },
135 { "+mppe-40", o_bool, &ccp_allowoptions[0].mppe,
136 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
137 &ccp_wantoptions[0].mppe },
138 { "nomppe-40", o_bool, &ccp_allowoptions[0].mppe,
139 "don't allow MPPE 40-bit encryption",
140 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40, &ccp_wantoptions[0].mppe },
141 { "-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
142 "don't allow MPPE 40-bit encryption",
143 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40,
144 &ccp_wantoptions[0].mppe },
146 { "require-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
147 "require MPPE 128-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
148 &ccp_wantoptions[0].mppe },
149 { "+mppe-128", o_bool, &ccp_allowoptions[0].mppe,
150 "require MPPE 128-bit encryption",
151 OPT_ALIAS | OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
152 &ccp_wantoptions[0].mppe },
153 { "nomppe-128", o_bool, &ccp_allowoptions[0].mppe,
154 "don't allow MPPE 128-bit encryption",
155 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128, &ccp_wantoptions[0].mppe },
156 { "-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
157 "don't allow MPPE 128-bit encryption",
158 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128,
159 &ccp_wantoptions[0].mppe },
161 /* strange one; we always request stateless, but will we allow stateful? */
162 { "mppe-stateful", o_bool, &refuse_mppe_stateful,
163 "allow MPPE stateful mode", OPT_PRIO },
164 { "nomppe-stateful", o_bool, &refuse_mppe_stateful,
165 "disallow MPPE stateful mode", OPT_PRIO | 1 },
172 * Protocol entry points from main code.
174 static void ccp_init (int unit);
175 static void ccp_open (int unit);
176 static void ccp_close (int unit, char *);
177 static void ccp_lowerup (int unit);
178 static void ccp_lowerdown (int);
179 static void ccp_input (int unit, u_char *pkt, int len);
180 static void ccp_protrej (int unit);
181 static int ccp_printpkt (u_char *pkt, int len,
182 void (*printer)(void *, char *, ...),
184 static void ccp_datainput (int unit, u_char *pkt, int len);
186 struct protent ccp_protent = {
206 fsm ccp_fsm[NUM_PPP];
207 ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */
208 ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */
209 ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */
210 ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */
213 * Callbacks for fsm code.
215 static void ccp_resetci (fsm *);
216 static int ccp_cilen (fsm *);
217 static void ccp_addci (fsm *, u_char *, int *);
218 static int ccp_ackci (fsm *, u_char *, int);
219 static int ccp_nakci (fsm *, u_char *, int, int);
220 static int ccp_rejci (fsm *, u_char *, int);
221 static int ccp_reqci (fsm *, u_char *, int *, int);
222 static void ccp_up (fsm *);
223 static void ccp_down (fsm *);
224 static int ccp_extcode (fsm *, int, int, u_char *, int);
225 static void ccp_rack_timeout (void *);
226 static char *method_name (ccp_options *, ccp_options *);
228 static fsm_callbacks ccp_callbacks = {
247 * Do we want / did we get any compression?
249 #define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \
250 || (opt).predictor_1 || (opt).predictor_2 \
254 * Local state (mainly for handling reset-reqs and reset-acks).
256 static int ccp_localstate[NUM_PPP];
257 #define RACK_PENDING 1 /* waiting for reset-ack */
258 #define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
260 #define RACKTIMEOUT 1 /* second */
262 static int all_rejected[NUM_PPP]; /* we rejected all peer's options */
268 setbsdcomp(char **argv)
274 abits = rbits = strtol(str, &endp, 0);
275 if (endp != str && *endp == ',') {
277 abits = strtol(str, &endp, 0);
279 if (*endp != 0 || endp == str) {
280 ppp_option_error("invalid parameter '%s' for bsdcomp option", *argv);
283 if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS))
284 || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) {
285 ppp_option_error("bsdcomp option values must be 0 or %d .. %d",
286 BSD_MIN_BITS, BSD_MAX_BITS);
290 ccp_wantoptions[0].bsd_compress = 1;
291 ccp_wantoptions[0].bsd_bits = rbits;
293 ccp_wantoptions[0].bsd_compress = 0;
295 ccp_allowoptions[0].bsd_compress = 1;
296 ccp_allowoptions[0].bsd_bits = abits;
298 ccp_allowoptions[0].bsd_compress = 0;
299 slprintf(bsd_value, sizeof(bsd_value),
300 rbits == abits? "%d": "%d,%d", rbits, abits);
306 setdeflate(char **argv)
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 ppp_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 ppp_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.
358 fsm *f = &ccp_fsm[unit];
361 f->protocol = PPP_CCP;
362 f->callbacks = &ccp_callbacks;
365 memset(&ccp_wantoptions[unit], 0, sizeof(ccp_options));
366 memset(&ccp_gotoptions[unit], 0, sizeof(ccp_options));
367 memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
368 memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
370 ccp_wantoptions[0].deflate = 1;
371 ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE;
372 ccp_wantoptions[0].deflate_correct = 1;
373 ccp_wantoptions[0].deflate_draft = 1;
374 ccp_allowoptions[0].deflate = 1;
375 ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE;
376 ccp_allowoptions[0].deflate_correct = 1;
377 ccp_allowoptions[0].deflate_draft = 1;
379 ccp_wantoptions[0].bsd_compress = 1;
380 ccp_wantoptions[0].bsd_bits = BSD_MAX_BITS;
381 ccp_allowoptions[0].bsd_compress = 1;
382 ccp_allowoptions[0].bsd_bits = BSD_MAX_BITS;
384 ccp_allowoptions[0].predictor_1 = 1;
388 * ccp_open - CCP is allowed to come up.
393 fsm *f = &ccp_fsm[unit];
395 if (f->state != OPENED)
396 ccp_flags_set(unit, 1, 0);
399 * Find out which compressors the kernel supports before
400 * deciding whether to open in silent mode.
403 if (!ANY_COMPRESS(ccp_gotoptions[unit]))
404 f->flags |= OPT_SILENT;
410 * ccp_close - Terminate CCP.
413 ccp_close(int unit, char *reason)
415 ccp_flags_set(unit, 0, 0);
416 fsm_close(&ccp_fsm[unit], reason);
420 * ccp_lowerup - we may now transmit CCP packets.
423 ccp_lowerup(int unit)
425 fsm_lowerup(&ccp_fsm[unit]);
429 * ccp_lowerdown - we may not transmit CCP packets.
432 ccp_lowerdown(int unit)
434 fsm_lowerdown(&ccp_fsm[unit]);
438 * ccp_input - process a received CCP packet.
441 ccp_input(int unit, u_char *p, int len)
443 fsm *f = &ccp_fsm[unit];
447 * Check for a terminate-request so we can print a message.
450 fsm_input(f, p, len);
451 if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED) {
452 notice("Compression disabled by peer.");
454 if (ccp_gotoptions[unit].mppe) {
455 error("MPPE disabled, closing LCP");
456 lcp_close(unit, "MPPE disabled by peer");
462 * If we get a terminate-ack and we're not asking for compression,
465 if (oldstate == REQSENT && p[0] == TERMACK
466 && !ANY_COMPRESS(ccp_gotoptions[unit]))
467 ccp_close(unit, "No compression negotiated");
471 * Handle a CCP-specific code.
474 ccp_extcode(fsm *f, int code, int id, u_char *p, int len)
478 if (f->state != OPENED)
480 /* send a reset-ack, which the transmitter will see and
481 reset its compression state. */
482 fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
486 if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) {
487 ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT);
488 UNTIMEOUT(ccp_rack_timeout, f);
500 * ccp_protrej - peer doesn't talk CCP.
503 ccp_protrej(int unit)
505 ccp_flags_set(unit, 0, 0);
506 fsm_lowerdown(&ccp_fsm[unit]);
509 if (ccp_gotoptions[unit].mppe) {
510 error("MPPE required but peer negotiation failed");
511 lcp_close(unit, "MPPE required but peer negotiation failed");
518 * ccp_resetci - initialize at start of negotiation.
523 ccp_options *go = &ccp_gotoptions[f->unit];
524 u_char opt_buf[CCP_MAX_OPTION_LENGTH];
526 *go = ccp_wantoptions[f->unit];
527 all_rejected[f->unit] = 0;
531 ccp_options *ao = &ccp_allowoptions[f->unit];
532 int auth_mschap_bits = auth_done[f->unit];
533 #ifdef PPP_WITH_EAPTLS
534 int auth_eap_bits = auth_done[f->unit];
539 * Start with a basic sanity check: mschap[v2] auth must be in
540 * exactly one direction. RFC 3079 says that the keys are
541 * 'derived from the credentials of the peer that initiated the call',
542 * however the PPP protocol doesn't have such a concept, and pppd
543 * cannot get this info externally. Instead we do the best we can.
544 * NB: If MPPE is required, all other compression opts are invalid.
545 * So, we return right away if we can't do it.
548 /* Leave only the mschap auth bits set */
549 auth_mschap_bits &= (CHAP_MS_WITHPEER | CHAP_MS_PEER |
550 CHAP_MS2_WITHPEER | CHAP_MS2_PEER);
551 /* Count the mschap auths */
552 auth_mschap_bits >>= CHAP_MS_SHIFT;
555 numbits += auth_mschap_bits & 1;
556 auth_mschap_bits >>= 1;
557 } while (auth_mschap_bits);
559 error("MPPE required, but auth done in both directions.");
560 lcp_close(f->unit, "MPPE required but not available");
564 #ifdef PPP_WITH_EAPTLS
566 * MPPE is also possible in combination with EAP-TLS.
567 * It is not possible to detect if we're doing EAP or EAP-TLS
568 * at this stage, hence we accept all forms of EAP. If TLS is
569 * not used then the MPPE keys will not be derived anyway.
571 /* Leave only the eap auth bits set */
572 auth_eap_bits &= (EAP_WITHPEER | EAP_PEER );
574 if ((numbits == 0) && (auth_eap_bits == 0)) {
575 error("MPPE required, but MS-CHAP[v2] nor EAP-TLS auth are performed.");
578 error("MPPE required, but MS-CHAP[v2] auth not performed.");
580 lcp_close(f->unit, "MPPE required but not available");
584 /* A plugin (eg radius) may not have obtained key material. */
585 if (!mppe_keys_isset()) {
586 error("MPPE required, but keys are not available. "
587 "Possible plugin problem?");
588 lcp_close(f->unit, "MPPE required but not available");
592 /* LM auth not supported for MPPE */
593 if (auth_done[f->unit] & (CHAP_MS_WITHPEER | CHAP_MS_PEER)) {
594 /* This might be noise */
595 if (go->mppe & MPPE_OPT_40) {
596 notice("Disabling 40-bit MPPE; MS-CHAP LM not supported");
597 go->mppe &= ~MPPE_OPT_40;
598 ccp_wantoptions[f->unit].mppe &= ~MPPE_OPT_40;
602 /* Last check: can we actually negotiate something? */
603 if (!(go->mppe & (MPPE_OPT_40 | MPPE_OPT_128))) {
604 /* Could be misconfig, could be 40-bit disabled above. */
605 error("MPPE required, but both 40-bit and 128-bit disabled.");
606 lcp_close(f->unit, "MPPE required but not available");
612 /* MPPE is not compatible with other compression types */
613 ao->bsd_compress = go->bsd_compress = 0;
614 ao->predictor_1 = go->predictor_1 = 0;
615 ao->predictor_2 = go->predictor_2 = 0;
616 ao->deflate = go->deflate = 0;
620 * Check whether the kernel knows about the various
621 * compression methods we might request.
624 opt_buf[0] = CI_MPPE;
625 opt_buf[1] = CILEN_MPPE;
626 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
627 /* Key material unimportant here. */
628 if (ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0) <= 0) {
629 error("MPPE required, but kernel has no support.");
630 lcp_close(f->unit, "MPPE required but not available");
633 #endif /* PPP_WITH_MPPE */
634 if (go->bsd_compress) {
635 opt_buf[0] = CI_BSD_COMPRESS;
636 opt_buf[1] = CILEN_BSD_COMPRESS;
637 opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS);
638 if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0)
639 go->bsd_compress = 0;
642 if (go->deflate_correct) {
643 opt_buf[0] = CI_DEFLATE;
644 opt_buf[1] = CILEN_DEFLATE;
645 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
646 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
647 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
648 go->deflate_correct = 0;
650 if (go->deflate_draft) {
651 opt_buf[0] = CI_DEFLATE_DRAFT;
652 opt_buf[1] = CILEN_DEFLATE;
653 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
654 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
655 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
656 go->deflate_draft = 0;
658 if (!go->deflate_correct && !go->deflate_draft)
661 if (go->predictor_1) {
662 opt_buf[0] = CI_PREDICTOR_1;
663 opt_buf[1] = CILEN_PREDICTOR_1;
664 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
667 if (go->predictor_2) {
668 opt_buf[0] = CI_PREDICTOR_2;
669 opt_buf[1] = CILEN_PREDICTOR_2;
670 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
676 * 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 && go->deflate_correct? CILEN_DEFLATE: 0)
685 + (go->deflate && go->deflate_draft? CILEN_DEFLATE: 0)
686 + (go->predictor_1? CILEN_PREDICTOR_1: 0)
687 + (go->predictor_2? CILEN_PREDICTOR_2: 0)
688 + (go->mppe? CILEN_MPPE: 0);
692 * ccp_addci - put our requests in a packet.
695 ccp_addci(fsm *f, u_char *p, int *lenp)
698 ccp_options *go = &ccp_gotoptions[f->unit];
702 * Add the compression types that we can receive, in decreasing
703 * preference order. Get the kernel to allocate the first one
704 * in case it gets Acked.
708 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
710 p[0] = opt_buf[0] = CI_MPPE;
711 p[1] = opt_buf[1] = CILEN_MPPE;
712 MPPE_OPTS_TO_CI(go->mppe, &p[2]);
713 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
714 mppe_get_recv_key(&opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
715 res = ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0);
719 /* This shouldn't happen, we've already tested it! */
720 lcp_close(f->unit, "MPPE required but not available in kernel");
724 p[0] = go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT;
725 p[1] = CILEN_DEFLATE;
726 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
727 p[3] = DEFLATE_CHK_SEQUENCE;
732 if (go->deflate_size < DEFLATE_MIN_WORKS) {
736 res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
740 } else if (res < 0) {
745 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
748 if (p != p0 && go->deflate_correct && go->deflate_draft) {
749 p[0] = CI_DEFLATE_DRAFT;
750 p[1] = CILEN_DEFLATE;
751 p[2] = p[2 - CILEN_DEFLATE];
752 p[3] = DEFLATE_CHK_SEQUENCE;
756 if (go->bsd_compress) {
757 p[0] = CI_BSD_COMPRESS;
758 p[1] = CILEN_BSD_COMPRESS;
759 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
761 p += CILEN_BSD_COMPRESS; /* not the first option */
764 if (go->bsd_bits < BSD_MIN_BITS) {
765 go->bsd_compress = 0;
768 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0);
770 p += CILEN_BSD_COMPRESS;
772 } else if (res < 0) {
773 go->bsd_compress = 0;
777 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
781 /* XXX Should Predictor 2 be preferable to Predictor 1? */
782 if (go->predictor_1) {
783 p[0] = CI_PREDICTOR_1;
784 p[1] = CILEN_PREDICTOR_1;
785 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) {
788 p += CILEN_PREDICTOR_1;
791 if (go->predictor_2) {
792 p[0] = CI_PREDICTOR_2;
793 p[1] = CILEN_PREDICTOR_2;
794 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) {
797 p += CILEN_PREDICTOR_2;
801 go->method = (p > p0)? p0[0]: -1;
807 * ccp_ackci - process a received configure-ack, and return
808 * 1 iff the packet was OK.
811 ccp_ackci(fsm *f, u_char *p, int len)
813 ccp_options *go = &ccp_gotoptions[f->unit];
818 u_char opt_buf[CILEN_MPPE];
820 opt_buf[0] = CI_MPPE;
821 opt_buf[1] = CILEN_MPPE;
822 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
823 if (len < CILEN_MPPE || memcmp(opt_buf, p, CILEN_MPPE))
827 /* XXX Cope with first/fast ack */
833 if (len < CILEN_DEFLATE
834 || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
835 || p[1] != CILEN_DEFLATE
836 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
837 || p[3] != DEFLATE_CHK_SEQUENCE)
840 len -= CILEN_DEFLATE;
841 /* XXX Cope with first/fast ack */
844 if (go->deflate_correct && go->deflate_draft) {
845 if (len < CILEN_DEFLATE
846 || p[0] != CI_DEFLATE_DRAFT
847 || p[1] != CILEN_DEFLATE
848 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
849 || p[3] != DEFLATE_CHK_SEQUENCE)
852 len -= CILEN_DEFLATE;
855 if (go->bsd_compress) {
856 if (len < CILEN_BSD_COMPRESS
857 || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
858 || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
860 p += CILEN_BSD_COMPRESS;
861 len -= CILEN_BSD_COMPRESS;
862 /* XXX Cope with first/fast ack */
863 if (p == p0 && len == 0)
866 if (go->predictor_1) {
867 if (len < CILEN_PREDICTOR_1
868 || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
870 p += CILEN_PREDICTOR_1;
871 len -= CILEN_PREDICTOR_1;
872 /* XXX Cope with first/fast ack */
873 if (p == p0 && len == 0)
876 if (go->predictor_2) {
877 if (len < CILEN_PREDICTOR_2
878 || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
880 p += CILEN_PREDICTOR_2;
881 len -= CILEN_PREDICTOR_2;
882 /* XXX Cope with first/fast ack */
883 if (p == p0 && len == 0)
893 * ccp_nakci - process received configure-nak.
894 * Returns 1 iff the nak was OK.
897 ccp_nakci(fsm *f, u_char *p, int len, int treat_as_reject)
899 ccp_options *go = &ccp_gotoptions[f->unit];
900 ccp_options no; /* options we've seen already */
901 ccp_options try; /* options to ask for next time */
903 memset(&no, 0, sizeof(no));
907 if (go->mppe && len >= CILEN_MPPE
908 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
911 * Peer wants us to use a different strength or other setting.
912 * Fail if we aren't willing to use his suggestion.
914 MPPE_CI_TO_OPTS(&p[2], try.mppe);
915 if ((try.mppe & MPPE_OPT_STATEFUL) && refuse_mppe_stateful) {
916 error("Refusing MPPE stateful mode offered by peer");
918 } else if (((go->mppe | MPPE_OPT_STATEFUL) & try.mppe) != try.mppe) {
919 /* Peer must have set options we didn't request (suggest) */
924 error("MPPE required but peer negotiation failed");
925 lcp_close(f->unit, "MPPE required but peer negotiation failed");
928 #endif /* PPP_WITH_MPPE */
929 if (go->deflate && len >= CILEN_DEFLATE
930 && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
931 && p[1] == CILEN_DEFLATE) {
934 * Peer wants us to use a different code size or something.
935 * Stop asking for Deflate if we don't understand his suggestion.
937 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
938 || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_WORKS
939 || p[3] != DEFLATE_CHK_SEQUENCE)
941 else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
942 try.deflate_size = DEFLATE_SIZE(p[2]);
944 len -= CILEN_DEFLATE;
945 if (go->deflate_correct && go->deflate_draft
946 && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
947 && p[1] == CILEN_DEFLATE) {
949 len -= CILEN_DEFLATE;
953 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
954 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
957 * Peer wants us to use a different number of bits
958 * or a different version.
960 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
961 try.bsd_compress = 0;
962 else if (BSD_NBITS(p[2]) < go->bsd_bits)
963 try.bsd_bits = BSD_NBITS(p[2]);
964 p += CILEN_BSD_COMPRESS;
965 len -= CILEN_BSD_COMPRESS;
969 * Predictor-1 and 2 have no options, so they can't be Naked.
971 * There may be remaining options but we ignore them.
974 if (f->state != OPENED)
980 * ccp_rejci - reject some of our suggested compression methods.
983 ccp_rejci(fsm *f, u_char *p, int len)
985 ccp_options *go = &ccp_gotoptions[f->unit];
986 ccp_options try; /* options to request next time */
991 * Cope with empty configure-rejects by ceasing to send
992 * configure-requests.
994 if (len == 0 && all_rejected[f->unit])
998 if (go->mppe && len >= CILEN_MPPE
999 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
1000 error("MPPE required but peer refused");
1001 lcp_close(f->unit, "MPPE required but peer refused");
1006 if (go->deflate_correct && len >= CILEN_DEFLATE
1007 && p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
1008 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1009 || p[3] != DEFLATE_CHK_SEQUENCE)
1010 return 0; /* Rej is bad */
1011 try.deflate_correct = 0;
1013 len -= CILEN_DEFLATE;
1015 if (go->deflate_draft && len >= CILEN_DEFLATE
1016 && p[0] == CI_DEFLATE_DRAFT && p[1] == CILEN_DEFLATE) {
1017 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1018 || p[3] != DEFLATE_CHK_SEQUENCE)
1019 return 0; /* Rej is bad */
1020 try.deflate_draft = 0;
1022 len -= CILEN_DEFLATE;
1024 if (!try.deflate_correct && !try.deflate_draft)
1026 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
1027 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
1028 if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
1030 try.bsd_compress = 0;
1031 p += CILEN_BSD_COMPRESS;
1032 len -= CILEN_BSD_COMPRESS;
1034 if (go->predictor_1 && len >= CILEN_PREDICTOR_1
1035 && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
1036 try.predictor_1 = 0;
1037 p += CILEN_PREDICTOR_1;
1038 len -= CILEN_PREDICTOR_1;
1040 if (go->predictor_2 && len >= CILEN_PREDICTOR_2
1041 && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
1042 try.predictor_2 = 0;
1043 p += CILEN_PREDICTOR_2;
1044 len -= CILEN_PREDICTOR_2;
1050 if (f->state != OPENED)
1057 * ccp_reqci - processed a received configure-request.
1058 * Returns CONFACK, CONFNAK or CONFREJ and the packet modified
1062 ccp_reqci(fsm *f, u_char *p, int *lenp, int dont_nak)
1064 int ret, newret, res;
1066 int len, clen, type, nb;
1067 ccp_options *ho = &ccp_hisoptions[f->unit];
1068 ccp_options *ao = &ccp_allowoptions[f->unit];
1069 #ifdef PPP_WITH_MPPE
1070 bool rej_for_ci_mppe = 1; /* Are we rejecting based on a bad/missing */
1071 /* CI_MPPE, or due to other options? */
1078 memset(ho, 0, sizeof(ccp_options));
1079 ho->method = (len > 0)? p[0]: -1;
1083 if (len < 2 || p[1] < 2 || p[1] > len) {
1093 #ifdef PPP_WITH_MPPE
1095 if (!ao->mppe || clen != CILEN_MPPE) {
1099 MPPE_CI_TO_OPTS(&p[2], ho->mppe);
1101 /* Nak if anything unsupported or unknown are set. */
1102 if (ho->mppe & MPPE_OPT_UNSUPPORTED) {
1104 ho->mppe &= ~MPPE_OPT_UNSUPPORTED;
1106 if (ho->mppe & MPPE_OPT_UNKNOWN) {
1108 ho->mppe &= ~MPPE_OPT_UNKNOWN;
1111 /* Check state opt */
1112 if (ho->mppe & MPPE_OPT_STATEFUL) {
1114 * We can Nak and request stateless, but it's a
1115 * lot easier to just assume the peer will request
1116 * it if he can do it; stateful mode is bad over
1117 * the Internet -- which is where we expect MPPE.
1119 if (refuse_mppe_stateful) {
1120 error("Refusing MPPE stateful mode offered by peer");
1126 /* Find out which of {S,L} are set. */
1127 if ((ho->mppe & MPPE_OPT_128)
1128 && (ho->mppe & MPPE_OPT_40)) {
1129 /* Both are set, negotiate the strongest. */
1131 if (ao->mppe & MPPE_OPT_128)
1132 ho->mppe &= ~MPPE_OPT_40;
1133 else if (ao->mppe & MPPE_OPT_40)
1134 ho->mppe &= ~MPPE_OPT_128;
1139 } else if (ho->mppe & MPPE_OPT_128) {
1140 if (!(ao->mppe & MPPE_OPT_128)) {
1144 } else if (ho->mppe & MPPE_OPT_40) {
1145 if (!(ao->mppe & MPPE_OPT_40)) {
1150 /* Neither are set. */
1151 /* We cannot accept this. */
1153 /* Give the peer our idea of what can be used,
1154 so it can choose and confirm */
1155 ho->mppe = ao->mppe;
1158 /* rebuild the opts */
1159 MPPE_OPTS_TO_CI(ho->mppe, &p[2]);
1160 if (newret == CONFACK) {
1161 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
1164 BCOPY(p, opt_buf, CILEN_MPPE);
1165 mppe_get_send_key(&opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
1166 if (ccp_test(f->unit, opt_buf,
1167 CILEN_MPPE + MPPE_MAX_KEY_LEN, 1) <= 0) {
1168 /* This shouldn't happen, we've already tested it! */
1169 error("MPPE required, but kernel has no support.");
1170 lcp_close(f->unit, "MPPE required but not available");
1175 * We need to decrease the interface MTU by MPPE_PAD
1176 * because MPPE frames **grow**. The kernel [must]
1177 * allocate MPPE_PAD extra bytes in xmit buffers.
1179 mtu = ppp_get_mtu(f->unit);
1181 ppp_set_mtu(f->unit, mtu - MPPE_PAD);
1187 * We have accepted MPPE or are willing to negotiate
1188 * MPPE parameters. A CONFREJ is due to subsequent
1189 * (non-MPPE) processing.
1191 rej_for_ci_mppe = 0;
1193 #endif /* PPP_WITH_MPPE */
1195 case CI_DEFLATE_DRAFT:
1196 if (!ao->deflate || clen != CILEN_DEFLATE
1197 || (!ao->deflate_correct && type == CI_DEFLATE)
1198 || (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) {
1204 ho->deflate_size = nb = DEFLATE_SIZE(p[2]);
1205 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
1206 || p[3] != DEFLATE_CHK_SEQUENCE
1207 || nb > ao->deflate_size || nb < DEFLATE_MIN_WORKS) {
1210 p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
1211 p[3] = DEFLATE_CHK_SEQUENCE;
1212 /* fall through to test this #bits below */
1218 * Check whether we can do Deflate with the window
1219 * size they want. If the window is too big, reduce
1220 * it until the kernel can cope and nak with that.
1221 * We only check this for the first option.
1225 res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
1227 break; /* it's OK now */
1228 if (res < 0 || nb == DEFLATE_MIN_WORKS || dont_nak) {
1230 p[2] = DEFLATE_MAKE_OPT(ho->deflate_size);
1235 p[2] = DEFLATE_MAKE_OPT(nb);
1240 case CI_BSD_COMPRESS:
1241 if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) {
1246 ho->bsd_compress = 1;
1247 ho->bsd_bits = nb = BSD_NBITS(p[2]);
1248 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
1249 || nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
1252 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
1253 /* fall through to test this #bits below */
1259 * Check whether we can do BSD-Compress with the code
1260 * size they want. If the code size is too big, reduce
1261 * it until the kernel can cope and nak with that.
1262 * We only check this for the first option.
1266 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1);
1269 if (res < 0 || nb == BSD_MIN_BITS || dont_nak) {
1271 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION,
1277 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
1282 case CI_PREDICTOR_1:
1283 if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) {
1288 ho->predictor_1 = 1;
1290 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
1295 case CI_PREDICTOR_2:
1296 if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) {
1301 ho->predictor_2 = 1;
1303 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
1313 if (newret == CONFNAK && dont_nak)
1315 if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) {
1316 /* we're returning this option */
1317 if (newret == CONFREJ && ret == CONFNAK)
1321 BCOPY(p, retp, clen);
1329 if (ret != CONFACK) {
1330 if (ret == CONFREJ && *lenp == retp - p0)
1331 all_rejected[f->unit] = 1;
1335 #ifdef PPP_WITH_MPPE
1336 if (ret == CONFREJ && ao->mppe && rej_for_ci_mppe) {
1337 error("MPPE required but peer negotiation failed");
1338 lcp_close(f->unit, "MPPE required but peer negotiation failed");
1345 * Make a string name for a compression method (or 2).
1348 method_name(ccp_options *opt, ccp_options *opt2)
1350 static char result[64];
1352 if (!ANY_COMPRESS(*opt))
1354 switch (opt->method) {
1355 #ifdef PPP_WITH_MPPE
1359 char *q = result + sizeof(result); /* 1 past result */
1361 slprintf(p, q - p, "MPPE ");
1363 if (opt->mppe & MPPE_OPT_128) {
1364 slprintf(p, q - p, "128-bit ");
1367 if (opt->mppe & MPPE_OPT_40) {
1368 slprintf(p, q - p, "40-bit ");
1371 if (opt->mppe & MPPE_OPT_STATEFUL)
1372 slprintf(p, q - p, "stateful");
1374 slprintf(p, q - p, "stateless");
1380 case CI_DEFLATE_DRAFT:
1381 if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
1382 slprintf(result, sizeof(result), "Deflate%s (%d/%d)",
1383 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1384 opt->deflate_size, opt2->deflate_size);
1386 slprintf(result, sizeof(result), "Deflate%s (%d)",
1387 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1390 case CI_BSD_COMPRESS:
1391 if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
1392 slprintf(result, sizeof(result), "BSD-Compress (%d/%d)",
1393 opt->bsd_bits, opt2->bsd_bits);
1395 slprintf(result, sizeof(result), "BSD-Compress (%d)",
1398 case CI_PREDICTOR_1:
1399 return "Predictor 1";
1400 case CI_PREDICTOR_2:
1401 return "Predictor 2";
1403 slprintf(result, sizeof(result), "Method %d", opt->method);
1409 * CCP has come up - inform the kernel driver and log a message.
1414 ccp_options *go = &ccp_gotoptions[f->unit];
1415 ccp_options *ho = &ccp_hisoptions[f->unit];
1418 ccp_flags_set(f->unit, 1, 1);
1419 if (ANY_COMPRESS(*go)) {
1420 if (ANY_COMPRESS(*ho)) {
1421 if (go->method == ho->method) {
1422 notice("%s compression enabled", method_name(go, ho));
1424 strlcpy(method1, method_name(go, NULL), sizeof(method1));
1425 notice("%s / %s compression enabled",
1426 method1, method_name(ho, NULL));
1429 notice("%s receive compression enabled", method_name(go, NULL));
1430 } else if (ANY_COMPRESS(*ho))
1431 notice("%s transmit compression enabled", method_name(ho, NULL));
1432 #ifdef PPP_WITH_MPPE
1435 continue_networks(f->unit); /* Bring up IP et al */
1441 * CCP has gone down - inform the kernel driver.
1446 if (ccp_localstate[f->unit] & RACK_PENDING)
1447 UNTIMEOUT(ccp_rack_timeout, f);
1448 ccp_localstate[f->unit] = 0;
1449 ccp_flags_set(f->unit, 1, 0);
1450 #ifdef PPP_WITH_MPPE
1451 if (ccp_gotoptions[f->unit].mppe) {
1452 ccp_gotoptions[f->unit].mppe = 0;
1453 if (lcp_fsm[f->unit].state == OPENED) {
1454 /* If LCP is not already going down, make sure it does. */
1455 error("MPPE disabled");
1456 lcp_close(f->unit, "MPPE disabled");
1463 * Print the contents of a CCP packet.
1465 static char *ccp_codenames[] = {
1466 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1467 "TermReq", "TermAck", "CodeRej",
1468 NULL, NULL, NULL, NULL, NULL, NULL,
1469 "ResetReq", "ResetAck",
1473 ccp_printpkt(u_char *p, int plen,
1474 void (*printer) (void *, char *, ...), void *arg)
1476 u_char *p0, *optend;
1481 if (plen < HEADERLEN)
1485 len = (p[2] << 8) + p[3];
1486 if (len < HEADERLEN || len > plen)
1489 if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *)
1490 && ccp_codenames[code-1] != NULL)
1491 printer(arg, " %s", ccp_codenames[code-1]);
1493 printer(arg, " code=0x%x", code);
1494 printer(arg, " id=0x%x", id);
1503 /* print list of possible compression methods */
1507 if (optlen < 2 || optlen > len)
1511 optend = p + optlen;
1513 #ifdef PPP_WITH_MPPE
1515 if (optlen >= CILEN_MPPE) {
1518 MPPE_CI_TO_OPTS(&p[2], mppe_opts);
1519 printer(arg, "mppe %s %s %s %s %s %s%s",
1520 (p[2] & MPPE_H_BIT)? "+H": "-H",
1521 (p[5] & MPPE_M_BIT)? "+M": "-M",
1522 (p[5] & MPPE_S_BIT)? "+S": "-S",
1523 (p[5] & MPPE_L_BIT)? "+L": "-L",
1524 (p[5] & MPPE_D_BIT)? "+D": "-D",
1525 (p[5] & MPPE_C_BIT)? "+C": "-C",
1526 (mppe_opts & MPPE_OPT_UNKNOWN)? " +U": "");
1527 if (mppe_opts & MPPE_OPT_UNKNOWN)
1528 printer(arg, " (%.2x %.2x %.2x %.2x)",
1529 p[2], p[3], p[4], p[5]);
1535 case CI_DEFLATE_DRAFT:
1536 if (optlen >= CILEN_DEFLATE) {
1537 printer(arg, "deflate%s %d",
1538 (code == CI_DEFLATE_DRAFT? "(old#)": ""),
1539 DEFLATE_SIZE(p[2]));
1540 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
1541 printer(arg, " method %d", DEFLATE_METHOD(p[2]));
1542 if (p[3] != DEFLATE_CHK_SEQUENCE)
1543 printer(arg, " check %d", p[3]);
1547 case CI_BSD_COMPRESS:
1548 if (optlen >= CILEN_BSD_COMPRESS) {
1549 printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
1551 p += CILEN_BSD_COMPRESS;
1554 case CI_PREDICTOR_1:
1555 if (optlen >= CILEN_PREDICTOR_1) {
1556 printer(arg, "predictor 1");
1557 p += CILEN_PREDICTOR_1;
1560 case CI_PREDICTOR_2:
1561 if (optlen >= CILEN_PREDICTOR_2) {
1562 printer(arg, "predictor 2");
1563 p += CILEN_PREDICTOR_2;
1568 printer(arg, " %.2x", *p++);
1575 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1576 print_string((char *)p, len, printer, arg);
1583 /* dump out the rest of the packet in hex */
1585 printer(arg, " %.2x", *p++);
1591 * We have received a packet that the decompressor failed to
1592 * decompress. Here we would expect to issue a reset-request, but
1593 * Motorola has a patent on resetting the compressor as a result of
1594 * detecting an error in the decompressed data after decompression.
1595 * (See US patent 5,130,993; international patent publication number
1596 * WO 91/10289; Australian patent 73296/91.)
1598 * So we ask the kernel whether the error was detected after
1599 * decompression; if it was, we take CCP down, thus disabling
1600 * compression :-(, otherwise we issue the reset-request.
1603 ccp_datainput(int unit, u_char *pkt, int len)
1608 if (f->state == OPENED) {
1609 if (ccp_fatal_error(unit)) {
1611 * Disable compression by taking CCP down.
1613 error("Lost compression sync: disabling compression");
1614 ccp_close(unit, "Lost compression sync");
1615 #ifdef PPP_WITH_MPPE
1617 * If we were doing MPPE, we must also take the link down.
1619 if (ccp_gotoptions[unit].mppe) {
1620 error("Too many MPPE errors, closing LCP");
1621 lcp_close(unit, "Too many MPPE errors");
1626 * Send a reset-request to reset the peer's compressor.
1627 * We don't do that if we are still waiting for an
1628 * acknowledgement to a previous reset-request.
1630 if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
1631 fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
1632 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1633 ccp_localstate[f->unit] |= RACK_PENDING;
1635 ccp_localstate[f->unit] |= RREQ_REPEAT;
1641 * Timeout waiting for reset-ack.
1644 ccp_rack_timeout(void *arg)
1648 if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
1649 fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
1650 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1651 ccp_localstate[f->unit] &= ~RREQ_REPEAT;
1653 ccp_localstate[f->unit] &= ~RACK_PENDING;