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.
35 #define RCSID "$Id: ccp.c,v 1.50 2005/06/26 19:34:41 carlsonj Exp $"
43 #include <net/ppp-comp.h>
47 #include "lcp.h" /* lcp_close(), lcp_fsm */
51 * Unfortunately there is a bug in zlib which means that using a
52 * size of 8 (window size = 256) for Deflate compression will cause
53 * buffer overruns and kernel crashes in the deflate module.
54 * Until this is fixed we only accept sizes in the range 9 .. 15.
55 * Thanks to James Carlson for pointing this out.
57 #define DEFLATE_MIN_WORKS 9
60 * Command-line options.
62 static int setbsdcomp (char **);
63 static int setdeflate (char **);
64 static char bsd_value[8];
65 static char deflate_value[8];
71 bool refuse_mppe_stateful = 1; /* Allow stateful mode? */
74 static option_t ccp_option_list[] = {
75 { "noccp", o_bool, &ccp_protent.enabled_flag,
76 "Disable CCP negotiation" },
77 { "-ccp", o_bool, &ccp_protent.enabled_flag,
78 "Disable CCP negotiation", OPT_ALIAS },
80 { "bsdcomp", o_special, (void *)setbsdcomp,
81 "Request BSD-Compress packet compression",
82 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value },
83 { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
84 "don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR,
85 &ccp_allowoptions[0].bsd_compress },
86 { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
87 "don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
88 &ccp_allowoptions[0].bsd_compress },
90 { "deflate", o_special, (void *)setdeflate,
91 "request Deflate compression",
92 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value },
93 { "nodeflate", o_bool, &ccp_wantoptions[0].deflate,
94 "don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR,
95 &ccp_allowoptions[0].deflate },
96 { "-deflate", o_bool, &ccp_wantoptions[0].deflate,
97 "don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
98 &ccp_allowoptions[0].deflate },
100 { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft,
101 "don't use draft deflate #", OPT_A2COPY,
102 &ccp_allowoptions[0].deflate_draft },
104 { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
105 "request Predictor-1", OPT_PRIO | 1 },
106 { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1,
107 "don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR,
108 &ccp_allowoptions[0].predictor_1 },
109 { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
110 "don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
111 &ccp_allowoptions[0].predictor_1 },
114 /* MPPE options are symmetrical ... we only set wantoptions here */
115 { "require-mppe", o_bool, &ccp_wantoptions[0].mppe,
116 "require MPPE encryption",
117 OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
118 { "+mppe", o_bool, &ccp_wantoptions[0].mppe,
119 "require MPPE encryption",
120 OPT_ALIAS | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
121 { "nomppe", o_bool, &ccp_wantoptions[0].mppe,
122 "don't allow MPPE encryption", OPT_PRIO },
123 { "-mppe", o_bool, &ccp_wantoptions[0].mppe,
124 "don't allow MPPE encryption", OPT_ALIAS | OPT_PRIO },
126 /* We use ccp_allowoptions[0].mppe as a junk var ... it is reset later */
127 { "require-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 { "+mppe-40", o_bool, &ccp_allowoptions[0].mppe,
131 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
132 &ccp_wantoptions[0].mppe },
133 { "nomppe-40", o_bool, &ccp_allowoptions[0].mppe,
134 "don't allow MPPE 40-bit encryption",
135 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40, &ccp_wantoptions[0].mppe },
136 { "-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
137 "don't allow MPPE 40-bit encryption",
138 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40,
139 &ccp_wantoptions[0].mppe },
141 { "require-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
142 "require MPPE 128-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
143 &ccp_wantoptions[0].mppe },
144 { "+mppe-128", o_bool, &ccp_allowoptions[0].mppe,
145 "require MPPE 128-bit encryption",
146 OPT_ALIAS | OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
147 &ccp_wantoptions[0].mppe },
148 { "nomppe-128", o_bool, &ccp_allowoptions[0].mppe,
149 "don't allow MPPE 128-bit encryption",
150 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128, &ccp_wantoptions[0].mppe },
151 { "-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
152 "don't allow MPPE 128-bit encryption",
153 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128,
154 &ccp_wantoptions[0].mppe },
156 /* strange one; we always request stateless, but will we allow stateful? */
157 { "mppe-stateful", o_bool, &refuse_mppe_stateful,
158 "allow MPPE stateful mode", OPT_PRIO },
159 { "nomppe-stateful", o_bool, &refuse_mppe_stateful,
160 "disallow MPPE stateful mode", OPT_PRIO | 1 },
167 * Protocol entry points from main code.
169 static void ccp_init (int unit);
170 static void ccp_open (int unit);
171 static void ccp_close (int unit, char *);
172 static void ccp_lowerup (int unit);
173 static void ccp_lowerdown (int);
174 static void ccp_input (int unit, u_char *pkt, int len);
175 static void ccp_protrej (int unit);
176 static int ccp_printpkt (u_char *pkt, int len,
177 void (*printer)(void *, char *, ...),
179 static void ccp_datainput (int unit, u_char *pkt, int len);
181 struct protent ccp_protent = {
201 fsm ccp_fsm[NUM_PPP];
202 ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */
203 ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */
204 ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */
205 ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */
208 * Callbacks for fsm code.
210 static void ccp_resetci (fsm *);
211 static int ccp_cilen (fsm *);
212 static void ccp_addci (fsm *, u_char *, int *);
213 static int ccp_ackci (fsm *, u_char *, int);
214 static int ccp_nakci (fsm *, u_char *, int, int);
215 static int ccp_rejci (fsm *, u_char *, int);
216 static int ccp_reqci (fsm *, u_char *, int *, int);
217 static void ccp_up (fsm *);
218 static void ccp_down (fsm *);
219 static int ccp_extcode (fsm *, int, int, u_char *, int);
220 static void ccp_rack_timeout (void *);
221 static char *method_name (ccp_options *, ccp_options *);
223 static fsm_callbacks ccp_callbacks = {
242 * Do we want / did we get any compression?
244 #define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \
245 || (opt).predictor_1 || (opt).predictor_2 \
249 * Local state (mainly for handling reset-reqs and reset-acks).
251 static int ccp_localstate[NUM_PPP];
252 #define RACK_PENDING 1 /* waiting for reset-ack */
253 #define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
255 #define RACKTIMEOUT 1 /* second */
257 static int all_rejected[NUM_PPP]; /* we rejected all peer's options */
263 setbsdcomp(char **argv)
269 abits = rbits = strtol(str, &endp, 0);
270 if (endp != str && *endp == ',') {
272 abits = strtol(str, &endp, 0);
274 if (*endp != 0 || endp == str) {
275 option_error("invalid parameter '%s' for bsdcomp option", *argv);
278 if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS))
279 || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) {
280 option_error("bsdcomp option values must be 0 or %d .. %d",
281 BSD_MIN_BITS, BSD_MAX_BITS);
285 ccp_wantoptions[0].bsd_compress = 1;
286 ccp_wantoptions[0].bsd_bits = rbits;
288 ccp_wantoptions[0].bsd_compress = 0;
290 ccp_allowoptions[0].bsd_compress = 1;
291 ccp_allowoptions[0].bsd_bits = abits;
293 ccp_allowoptions[0].bsd_compress = 0;
294 slprintf(bsd_value, sizeof(bsd_value),
295 rbits == abits? "%d": "%d,%d", rbits, abits);
301 setdeflate(char **argv)
307 abits = rbits = strtol(str, &endp, 0);
308 if (endp != str && *endp == ',') {
310 abits = strtol(str, &endp, 0);
312 if (*endp != 0 || endp == str) {
313 option_error("invalid parameter '%s' for deflate option", *argv);
316 if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE))
317 || (abits != 0 && (abits < DEFLATE_MIN_SIZE
318 || abits > DEFLATE_MAX_SIZE))) {
319 option_error("deflate option values must be 0 or %d .. %d",
320 DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE);
323 if (rbits == DEFLATE_MIN_SIZE || abits == DEFLATE_MIN_SIZE) {
324 if (rbits == DEFLATE_MIN_SIZE)
325 rbits = DEFLATE_MIN_WORKS;
326 if (abits == DEFLATE_MIN_SIZE)
327 abits = DEFLATE_MIN_WORKS;
328 warn("deflate option value of %d changed to %d to avoid zlib bug",
329 DEFLATE_MIN_SIZE, DEFLATE_MIN_WORKS);
332 ccp_wantoptions[0].deflate = 1;
333 ccp_wantoptions[0].deflate_size = rbits;
335 ccp_wantoptions[0].deflate = 0;
337 ccp_allowoptions[0].deflate = 1;
338 ccp_allowoptions[0].deflate_size = abits;
340 ccp_allowoptions[0].deflate = 0;
341 slprintf(deflate_value, sizeof(deflate_value),
342 rbits == abits? "%d": "%d,%d", rbits, abits);
348 * ccp_init - initialize CCP.
353 fsm *f = &ccp_fsm[unit];
356 f->protocol = PPP_CCP;
357 f->callbacks = &ccp_callbacks;
360 memset(&ccp_wantoptions[unit], 0, sizeof(ccp_options));
361 memset(&ccp_gotoptions[unit], 0, sizeof(ccp_options));
362 memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
363 memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
365 ccp_wantoptions[0].deflate = 1;
366 ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE;
367 ccp_wantoptions[0].deflate_correct = 1;
368 ccp_wantoptions[0].deflate_draft = 1;
369 ccp_allowoptions[0].deflate = 1;
370 ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE;
371 ccp_allowoptions[0].deflate_correct = 1;
372 ccp_allowoptions[0].deflate_draft = 1;
374 ccp_wantoptions[0].bsd_compress = 1;
375 ccp_wantoptions[0].bsd_bits = BSD_MAX_BITS;
376 ccp_allowoptions[0].bsd_compress = 1;
377 ccp_allowoptions[0].bsd_bits = BSD_MAX_BITS;
379 ccp_allowoptions[0].predictor_1 = 1;
383 * ccp_open - CCP is allowed to come up.
388 fsm *f = &ccp_fsm[unit];
390 if (f->state != OPENED)
391 ccp_flags_set(unit, 1, 0);
394 * Find out which compressors the kernel supports before
395 * deciding whether to open in silent mode.
398 if (!ANY_COMPRESS(ccp_gotoptions[unit]))
399 f->flags |= OPT_SILENT;
405 * ccp_close - Terminate CCP.
408 ccp_close(int unit, char *reason)
410 ccp_flags_set(unit, 0, 0);
411 fsm_close(&ccp_fsm[unit], reason);
415 * ccp_lowerup - we may now transmit CCP packets.
418 ccp_lowerup(int unit)
420 fsm_lowerup(&ccp_fsm[unit]);
424 * ccp_lowerdown - we may not transmit CCP packets.
427 ccp_lowerdown(int unit)
429 fsm_lowerdown(&ccp_fsm[unit]);
433 * ccp_input - process a received CCP packet.
436 ccp_input(int unit, u_char *p, int len)
438 fsm *f = &ccp_fsm[unit];
442 * Check for a terminate-request so we can print a message.
445 fsm_input(f, p, len);
446 if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED) {
447 notice("Compression disabled by peer.");
449 if (ccp_gotoptions[unit].mppe) {
450 error("MPPE disabled, closing LCP");
451 lcp_close(unit, "MPPE disabled by peer");
457 * If we get a terminate-ack and we're not asking for compression,
460 if (oldstate == REQSENT && p[0] == TERMACK
461 && !ANY_COMPRESS(ccp_gotoptions[unit]))
462 ccp_close(unit, "No compression negotiated");
466 * Handle a CCP-specific code.
469 ccp_extcode(fsm *f, int code, int id, u_char *p, int len)
473 if (f->state != OPENED)
475 /* send a reset-ack, which the transmitter will see and
476 reset its compression state. */
477 fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
481 if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) {
482 ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT);
483 UNTIMEOUT(ccp_rack_timeout, f);
495 * ccp_protrej - peer doesn't talk CCP.
498 ccp_protrej(int unit)
500 ccp_flags_set(unit, 0, 0);
501 fsm_lowerdown(&ccp_fsm[unit]);
504 if (ccp_gotoptions[unit].mppe) {
505 error("MPPE required but peer negotiation failed");
506 lcp_close(unit, "MPPE required but peer negotiation failed");
513 * ccp_resetci - initialize at start of negotiation.
518 ccp_options *go = &ccp_gotoptions[f->unit];
519 u_char opt_buf[CCP_MAX_OPTION_LENGTH];
521 *go = ccp_wantoptions[f->unit];
522 all_rejected[f->unit] = 0;
526 ccp_options *ao = &ccp_allowoptions[f->unit];
527 int auth_mschap_bits = auth_done[f->unit];
528 #ifdef PPP_WITH_EAPTLS
529 int auth_eap_bits = auth_done[f->unit];
534 * Start with a basic sanity check: mschap[v2] auth must be in
535 * exactly one direction. RFC 3079 says that the keys are
536 * 'derived from the credentials of the peer that initiated the call',
537 * however the PPP protocol doesn't have such a concept, and pppd
538 * cannot get this info externally. Instead we do the best we can.
539 * NB: If MPPE is required, all other compression opts are invalid.
540 * So, we return right away if we can't do it.
543 /* Leave only the mschap auth bits set */
544 auth_mschap_bits &= (CHAP_MS_WITHPEER | CHAP_MS_PEER |
545 CHAP_MS2_WITHPEER | CHAP_MS2_PEER);
546 /* Count the mschap auths */
547 auth_mschap_bits >>= CHAP_MS_SHIFT;
550 numbits += auth_mschap_bits & 1;
551 auth_mschap_bits >>= 1;
552 } while (auth_mschap_bits);
554 error("MPPE required, but auth done in both directions.");
555 lcp_close(f->unit, "MPPE required but not available");
559 #ifdef PPP_WITH_EAPTLS
561 * MPPE is also possible in combination with EAP-TLS.
562 * It is not possible to detect if we're doing EAP or EAP-TLS
563 * at this stage, hence we accept all forms of EAP. If TLS is
564 * not used then the MPPE keys will not be derived anyway.
566 /* Leave only the eap auth bits set */
567 auth_eap_bits &= (EAP_WITHPEER | EAP_PEER );
569 if ((numbits == 0) && (auth_eap_bits == 0)) {
570 error("MPPE required, but MS-CHAP[v2] nor EAP-TLS auth are performed.");
573 error("MPPE required, but MS-CHAP[v2] auth not performed.");
575 lcp_close(f->unit, "MPPE required but not available");
579 /* A plugin (eg radius) may not have obtained key material. */
580 if (!mppe_keys_isset()) {
581 error("MPPE required, but keys are not available. "
582 "Possible plugin problem?");
583 lcp_close(f->unit, "MPPE required but not available");
587 /* LM auth not supported for MPPE */
588 if (auth_done[f->unit] & (CHAP_MS_WITHPEER | CHAP_MS_PEER)) {
589 /* This might be noise */
590 if (go->mppe & MPPE_OPT_40) {
591 notice("Disabling 40-bit MPPE; MS-CHAP LM not supported");
592 go->mppe &= ~MPPE_OPT_40;
593 ccp_wantoptions[f->unit].mppe &= ~MPPE_OPT_40;
597 /* Last check: can we actually negotiate something? */
598 if (!(go->mppe & (MPPE_OPT_40 | MPPE_OPT_128))) {
599 /* Could be misconfig, could be 40-bit disabled above. */
600 error("MPPE required, but both 40-bit and 128-bit disabled.");
601 lcp_close(f->unit, "MPPE required but not available");
607 /* MPPE is not compatible with other compression types */
608 ao->bsd_compress = go->bsd_compress = 0;
609 ao->predictor_1 = go->predictor_1 = 0;
610 ao->predictor_2 = go->predictor_2 = 0;
611 ao->deflate = go->deflate = 0;
615 * Check whether the kernel knows about the various
616 * compression methods we might request.
619 opt_buf[0] = CI_MPPE;
620 opt_buf[1] = CILEN_MPPE;
621 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
622 /* Key material unimportant here. */
623 if (ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0) <= 0) {
624 error("MPPE required, but kernel has no support.");
625 lcp_close(f->unit, "MPPE required but not available");
628 #endif /* PPP_WITH_MPPE */
629 if (go->bsd_compress) {
630 opt_buf[0] = CI_BSD_COMPRESS;
631 opt_buf[1] = CILEN_BSD_COMPRESS;
632 opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS);
633 if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0)
634 go->bsd_compress = 0;
637 if (go->deflate_correct) {
638 opt_buf[0] = CI_DEFLATE;
639 opt_buf[1] = CILEN_DEFLATE;
640 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
641 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
642 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
643 go->deflate_correct = 0;
645 if (go->deflate_draft) {
646 opt_buf[0] = CI_DEFLATE_DRAFT;
647 opt_buf[1] = CILEN_DEFLATE;
648 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
649 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
650 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
651 go->deflate_draft = 0;
653 if (!go->deflate_correct && !go->deflate_draft)
656 if (go->predictor_1) {
657 opt_buf[0] = CI_PREDICTOR_1;
658 opt_buf[1] = CILEN_PREDICTOR_1;
659 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
662 if (go->predictor_2) {
663 opt_buf[0] = CI_PREDICTOR_2;
664 opt_buf[1] = CILEN_PREDICTOR_2;
665 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
671 * ccp_cilen - Return total length of our configuration info.
676 ccp_options *go = &ccp_gotoptions[f->unit];
678 return (go->bsd_compress? CILEN_BSD_COMPRESS: 0)
679 + (go->deflate && go->deflate_correct? CILEN_DEFLATE: 0)
680 + (go->deflate && go->deflate_draft? CILEN_DEFLATE: 0)
681 + (go->predictor_1? CILEN_PREDICTOR_1: 0)
682 + (go->predictor_2? CILEN_PREDICTOR_2: 0)
683 + (go->mppe? CILEN_MPPE: 0);
687 * ccp_addci - put our requests in a packet.
690 ccp_addci(fsm *f, u_char *p, int *lenp)
693 ccp_options *go = &ccp_gotoptions[f->unit];
697 * Add the compression types that we can receive, in decreasing
698 * preference order. Get the kernel to allocate the first one
699 * in case it gets Acked.
703 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
705 p[0] = opt_buf[0] = CI_MPPE;
706 p[1] = opt_buf[1] = CILEN_MPPE;
707 MPPE_OPTS_TO_CI(go->mppe, &p[2]);
708 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
709 mppe_get_recv_key(&opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
710 res = ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0);
714 /* This shouldn't happen, we've already tested it! */
715 lcp_close(f->unit, "MPPE required but not available in kernel");
719 p[0] = go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT;
720 p[1] = CILEN_DEFLATE;
721 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
722 p[3] = DEFLATE_CHK_SEQUENCE;
727 if (go->deflate_size < DEFLATE_MIN_WORKS) {
731 res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
735 } else if (res < 0) {
740 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
743 if (p != p0 && go->deflate_correct && go->deflate_draft) {
744 p[0] = CI_DEFLATE_DRAFT;
745 p[1] = CILEN_DEFLATE;
746 p[2] = p[2 - CILEN_DEFLATE];
747 p[3] = DEFLATE_CHK_SEQUENCE;
751 if (go->bsd_compress) {
752 p[0] = CI_BSD_COMPRESS;
753 p[1] = CILEN_BSD_COMPRESS;
754 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
756 p += CILEN_BSD_COMPRESS; /* not the first option */
759 if (go->bsd_bits < BSD_MIN_BITS) {
760 go->bsd_compress = 0;
763 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0);
765 p += CILEN_BSD_COMPRESS;
767 } else if (res < 0) {
768 go->bsd_compress = 0;
772 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
776 /* XXX Should Predictor 2 be preferable to Predictor 1? */
777 if (go->predictor_1) {
778 p[0] = CI_PREDICTOR_1;
779 p[1] = CILEN_PREDICTOR_1;
780 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) {
783 p += CILEN_PREDICTOR_1;
786 if (go->predictor_2) {
787 p[0] = CI_PREDICTOR_2;
788 p[1] = CILEN_PREDICTOR_2;
789 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) {
792 p += CILEN_PREDICTOR_2;
796 go->method = (p > p0)? p0[0]: -1;
802 * ccp_ackci - process a received configure-ack, and return
803 * 1 iff the packet was OK.
806 ccp_ackci(fsm *f, u_char *p, int len)
808 ccp_options *go = &ccp_gotoptions[f->unit];
813 u_char opt_buf[CILEN_MPPE];
815 opt_buf[0] = CI_MPPE;
816 opt_buf[1] = CILEN_MPPE;
817 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
818 if (len < CILEN_MPPE || memcmp(opt_buf, p, CILEN_MPPE))
822 /* XXX Cope with first/fast ack */
828 if (len < CILEN_DEFLATE
829 || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
830 || p[1] != CILEN_DEFLATE
831 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
832 || p[3] != DEFLATE_CHK_SEQUENCE)
835 len -= CILEN_DEFLATE;
836 /* XXX Cope with first/fast ack */
839 if (go->deflate_correct && go->deflate_draft) {
840 if (len < CILEN_DEFLATE
841 || p[0] != CI_DEFLATE_DRAFT
842 || p[1] != CILEN_DEFLATE
843 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
844 || p[3] != DEFLATE_CHK_SEQUENCE)
847 len -= CILEN_DEFLATE;
850 if (go->bsd_compress) {
851 if (len < CILEN_BSD_COMPRESS
852 || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
853 || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
855 p += CILEN_BSD_COMPRESS;
856 len -= CILEN_BSD_COMPRESS;
857 /* XXX Cope with first/fast ack */
858 if (p == p0 && len == 0)
861 if (go->predictor_1) {
862 if (len < CILEN_PREDICTOR_1
863 || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
865 p += CILEN_PREDICTOR_1;
866 len -= CILEN_PREDICTOR_1;
867 /* XXX Cope with first/fast ack */
868 if (p == p0 && len == 0)
871 if (go->predictor_2) {
872 if (len < CILEN_PREDICTOR_2
873 || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
875 p += CILEN_PREDICTOR_2;
876 len -= CILEN_PREDICTOR_2;
877 /* XXX Cope with first/fast ack */
878 if (p == p0 && len == 0)
888 * ccp_nakci - process received configure-nak.
889 * Returns 1 iff the nak was OK.
892 ccp_nakci(fsm *f, u_char *p, int len, int treat_as_reject)
894 ccp_options *go = &ccp_gotoptions[f->unit];
895 ccp_options no; /* options we've seen already */
896 ccp_options try; /* options to ask for next time */
898 memset(&no, 0, sizeof(no));
902 if (go->mppe && len >= CILEN_MPPE
903 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
906 * Peer wants us to use a different strength or other setting.
907 * Fail if we aren't willing to use his suggestion.
909 MPPE_CI_TO_OPTS(&p[2], try.mppe);
910 if ((try.mppe & MPPE_OPT_STATEFUL) && refuse_mppe_stateful) {
911 error("Refusing MPPE stateful mode offered by peer");
913 } else if (((go->mppe | MPPE_OPT_STATEFUL) & try.mppe) != try.mppe) {
914 /* Peer must have set options we didn't request (suggest) */
919 error("MPPE required but peer negotiation failed");
920 lcp_close(f->unit, "MPPE required but peer negotiation failed");
923 #endif /* PPP_WITH_MPPE */
924 if (go->deflate && len >= CILEN_DEFLATE
925 && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
926 && p[1] == CILEN_DEFLATE) {
929 * Peer wants us to use a different code size or something.
930 * Stop asking for Deflate if we don't understand his suggestion.
932 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
933 || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_WORKS
934 || p[3] != DEFLATE_CHK_SEQUENCE)
936 else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
937 try.deflate_size = DEFLATE_SIZE(p[2]);
939 len -= CILEN_DEFLATE;
940 if (go->deflate_correct && go->deflate_draft
941 && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
942 && p[1] == CILEN_DEFLATE) {
944 len -= CILEN_DEFLATE;
948 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
949 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
952 * Peer wants us to use a different number of bits
953 * or a different version.
955 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
956 try.bsd_compress = 0;
957 else if (BSD_NBITS(p[2]) < go->bsd_bits)
958 try.bsd_bits = BSD_NBITS(p[2]);
959 p += CILEN_BSD_COMPRESS;
960 len -= CILEN_BSD_COMPRESS;
964 * Predictor-1 and 2 have no options, so they can't be Naked.
966 * There may be remaining options but we ignore them.
969 if (f->state != OPENED)
975 * ccp_rejci - reject some of our suggested compression methods.
978 ccp_rejci(fsm *f, u_char *p, int len)
980 ccp_options *go = &ccp_gotoptions[f->unit];
981 ccp_options try; /* options to request next time */
986 * Cope with empty configure-rejects by ceasing to send
987 * configure-requests.
989 if (len == 0 && all_rejected[f->unit])
993 if (go->mppe && len >= CILEN_MPPE
994 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
995 error("MPPE required but peer refused");
996 lcp_close(f->unit, "MPPE required but peer refused");
1001 if (go->deflate_correct && len >= CILEN_DEFLATE
1002 && p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
1003 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1004 || p[3] != DEFLATE_CHK_SEQUENCE)
1005 return 0; /* Rej is bad */
1006 try.deflate_correct = 0;
1008 len -= CILEN_DEFLATE;
1010 if (go->deflate_draft && len >= CILEN_DEFLATE
1011 && p[0] == CI_DEFLATE_DRAFT && p[1] == CILEN_DEFLATE) {
1012 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1013 || p[3] != DEFLATE_CHK_SEQUENCE)
1014 return 0; /* Rej is bad */
1015 try.deflate_draft = 0;
1017 len -= CILEN_DEFLATE;
1019 if (!try.deflate_correct && !try.deflate_draft)
1021 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
1022 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
1023 if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
1025 try.bsd_compress = 0;
1026 p += CILEN_BSD_COMPRESS;
1027 len -= CILEN_BSD_COMPRESS;
1029 if (go->predictor_1 && len >= CILEN_PREDICTOR_1
1030 && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
1031 try.predictor_1 = 0;
1032 p += CILEN_PREDICTOR_1;
1033 len -= CILEN_PREDICTOR_1;
1035 if (go->predictor_2 && len >= CILEN_PREDICTOR_2
1036 && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
1037 try.predictor_2 = 0;
1038 p += CILEN_PREDICTOR_2;
1039 len -= CILEN_PREDICTOR_2;
1045 if (f->state != OPENED)
1052 * ccp_reqci - processed a received configure-request.
1053 * Returns CONFACK, CONFNAK or CONFREJ and the packet modified
1057 ccp_reqci(fsm *f, u_char *p, int *lenp, int dont_nak)
1059 int ret, newret, res;
1061 int len, clen, type, nb;
1062 ccp_options *ho = &ccp_hisoptions[f->unit];
1063 ccp_options *ao = &ccp_allowoptions[f->unit];
1064 #ifdef PPP_WITH_MPPE
1065 bool rej_for_ci_mppe = 1; /* Are we rejecting based on a bad/missing */
1066 /* CI_MPPE, or due to other options? */
1073 memset(ho, 0, sizeof(ccp_options));
1074 ho->method = (len > 0)? p[0]: -1;
1078 if (len < 2 || p[1] < 2 || p[1] > len) {
1088 #ifdef PPP_WITH_MPPE
1090 if (!ao->mppe || clen != CILEN_MPPE) {
1094 MPPE_CI_TO_OPTS(&p[2], ho->mppe);
1096 /* Nak if anything unsupported or unknown are set. */
1097 if (ho->mppe & MPPE_OPT_UNSUPPORTED) {
1099 ho->mppe &= ~MPPE_OPT_UNSUPPORTED;
1101 if (ho->mppe & MPPE_OPT_UNKNOWN) {
1103 ho->mppe &= ~MPPE_OPT_UNKNOWN;
1106 /* Check state opt */
1107 if (ho->mppe & MPPE_OPT_STATEFUL) {
1109 * We can Nak and request stateless, but it's a
1110 * lot easier to just assume the peer will request
1111 * it if he can do it; stateful mode is bad over
1112 * the Internet -- which is where we expect MPPE.
1114 if (refuse_mppe_stateful) {
1115 error("Refusing MPPE stateful mode offered by peer");
1121 /* Find out which of {S,L} are set. */
1122 if ((ho->mppe & MPPE_OPT_128)
1123 && (ho->mppe & MPPE_OPT_40)) {
1124 /* Both are set, negotiate the strongest. */
1126 if (ao->mppe & MPPE_OPT_128)
1127 ho->mppe &= ~MPPE_OPT_40;
1128 else if (ao->mppe & MPPE_OPT_40)
1129 ho->mppe &= ~MPPE_OPT_128;
1134 } else if (ho->mppe & MPPE_OPT_128) {
1135 if (!(ao->mppe & MPPE_OPT_128)) {
1139 } else if (ho->mppe & MPPE_OPT_40) {
1140 if (!(ao->mppe & MPPE_OPT_40)) {
1145 /* Neither are set. */
1146 /* We cannot accept this. */
1148 /* Give the peer our idea of what can be used,
1149 so it can choose and confirm */
1150 ho->mppe = ao->mppe;
1153 /* rebuild the opts */
1154 MPPE_OPTS_TO_CI(ho->mppe, &p[2]);
1155 if (newret == CONFACK) {
1156 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
1159 BCOPY(p, opt_buf, CILEN_MPPE);
1160 mppe_get_send_key(&opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
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;
1188 #endif /* PPP_WITH_MPPE */
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;
1330 #ifdef PPP_WITH_MPPE
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) {
1350 #ifdef PPP_WITH_MPPE
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));
1427 #ifdef PPP_WITH_MPPE
1430 continue_networks(f->unit); /* Bring up IP et al */
1436 * CCP has gone down - inform the kernel driver.
1441 if (ccp_localstate[f->unit] & RACK_PENDING)
1442 UNTIMEOUT(ccp_rack_timeout, f);
1443 ccp_localstate[f->unit] = 0;
1444 ccp_flags_set(f->unit, 1, 0);
1445 #ifdef PPP_WITH_MPPE
1446 if (ccp_gotoptions[f->unit].mppe) {
1447 ccp_gotoptions[f->unit].mppe = 0;
1448 if (lcp_fsm[f->unit].state == OPENED) {
1449 /* If LCP is not already going down, make sure it does. */
1450 error("MPPE disabled");
1451 lcp_close(f->unit, "MPPE disabled");
1458 * Print the contents of a CCP packet.
1460 static char *ccp_codenames[] = {
1461 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1462 "TermReq", "TermAck", "CodeRej",
1463 NULL, NULL, NULL, NULL, NULL, NULL,
1464 "ResetReq", "ResetAck",
1468 ccp_printpkt(u_char *p, int plen,
1469 void (*printer) (void *, char *, ...), void *arg)
1471 u_char *p0, *optend;
1476 if (plen < HEADERLEN)
1480 len = (p[2] << 8) + p[3];
1481 if (len < HEADERLEN || len > plen)
1484 if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *)
1485 && ccp_codenames[code-1] != NULL)
1486 printer(arg, " %s", ccp_codenames[code-1]);
1488 printer(arg, " code=0x%x", code);
1489 printer(arg, " id=0x%x", id);
1498 /* print list of possible compression methods */
1502 if (optlen < 2 || optlen > len)
1506 optend = p + optlen;
1508 #ifdef PPP_WITH_MPPE
1510 if (optlen >= CILEN_MPPE) {
1513 MPPE_CI_TO_OPTS(&p[2], mppe_opts);
1514 printer(arg, "mppe %s %s %s %s %s %s%s",
1515 (p[2] & MPPE_H_BIT)? "+H": "-H",
1516 (p[5] & MPPE_M_BIT)? "+M": "-M",
1517 (p[5] & MPPE_S_BIT)? "+S": "-S",
1518 (p[5] & MPPE_L_BIT)? "+L": "-L",
1519 (p[5] & MPPE_D_BIT)? "+D": "-D",
1520 (p[5] & MPPE_C_BIT)? "+C": "-C",
1521 (mppe_opts & MPPE_OPT_UNKNOWN)? " +U": "");
1522 if (mppe_opts & MPPE_OPT_UNKNOWN)
1523 printer(arg, " (%.2x %.2x %.2x %.2x)",
1524 p[2], p[3], p[4], p[5]);
1530 case CI_DEFLATE_DRAFT:
1531 if (optlen >= CILEN_DEFLATE) {
1532 printer(arg, "deflate%s %d",
1533 (code == CI_DEFLATE_DRAFT? "(old#)": ""),
1534 DEFLATE_SIZE(p[2]));
1535 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
1536 printer(arg, " method %d", DEFLATE_METHOD(p[2]));
1537 if (p[3] != DEFLATE_CHK_SEQUENCE)
1538 printer(arg, " check %d", p[3]);
1542 case CI_BSD_COMPRESS:
1543 if (optlen >= CILEN_BSD_COMPRESS) {
1544 printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
1546 p += CILEN_BSD_COMPRESS;
1549 case CI_PREDICTOR_1:
1550 if (optlen >= CILEN_PREDICTOR_1) {
1551 printer(arg, "predictor 1");
1552 p += CILEN_PREDICTOR_1;
1555 case CI_PREDICTOR_2:
1556 if (optlen >= CILEN_PREDICTOR_2) {
1557 printer(arg, "predictor 2");
1558 p += CILEN_PREDICTOR_2;
1563 printer(arg, " %.2x", *p++);
1570 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1571 print_string((char *)p, len, printer, arg);
1578 /* dump out the rest of the packet in hex */
1580 printer(arg, " %.2x", *p++);
1586 * We have received a packet that the decompressor failed to
1587 * decompress. Here we would expect to issue a reset-request, but
1588 * Motorola has a patent on resetting the compressor as a result of
1589 * detecting an error in the decompressed data after decompression.
1590 * (See US patent 5,130,993; international patent publication number
1591 * WO 91/10289; Australian patent 73296/91.)
1593 * So we ask the kernel whether the error was detected after
1594 * decompression; if it was, we take CCP down, thus disabling
1595 * compression :-(, otherwise we issue the reset-request.
1598 ccp_datainput(int unit, u_char *pkt, int len)
1603 if (f->state == OPENED) {
1604 if (ccp_fatal_error(unit)) {
1606 * Disable compression by taking CCP down.
1608 error("Lost compression sync: disabling compression");
1609 ccp_close(unit, "Lost compression sync");
1610 #ifdef PPP_WITH_MPPE
1612 * If we were doing MPPE, we must also take the link down.
1614 if (ccp_gotoptions[unit].mppe) {
1615 error("Too many MPPE errors, closing LCP");
1616 lcp_close(unit, "Too many MPPE errors");
1621 * Send a reset-request to reset the peer's compressor.
1622 * We don't do that if we are still waiting for an
1623 * acknowledgement to a previous reset-request.
1625 if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
1626 fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
1627 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1628 ccp_localstate[f->unit] |= RACK_PENDING;
1630 ccp_localstate[f->unit] |= RREQ_REPEAT;
1636 * Timeout waiting for reset-ack.
1639 ccp_rack_timeout(void *arg)
1643 if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
1644 fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
1645 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1646 ccp_localstate[f->unit] &= ~RREQ_REPEAT;
1648 ccp_localstate[f->unit] &= ~RACK_PENDING;