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 $"
40 #include <net/ppp-comp.h>
42 #include <linux/ppp-comp.h>
51 #include "lcp.h" /* lcp_close(), lcp_fsm */
55 * Unfortunately there is a bug in zlib which means that using a
56 * size of 8 (window size = 256) for Deflate compression will cause
57 * buffer overruns and kernel crashes in the deflate module.
58 * Until this is fixed we only accept sizes in the range 9 .. 15.
59 * Thanks to James Carlson for pointing this out.
61 #define DEFLATE_MIN_WORKS 9
64 * Command-line options.
66 static int setbsdcomp (char **);
67 static int setdeflate (char **);
68 static char bsd_value[8];
69 static char deflate_value[8];
75 bool refuse_mppe_stateful = 1; /* Allow stateful mode? */
78 static option_t ccp_option_list[] = {
79 { "noccp", o_bool, &ccp_protent.enabled_flag,
80 "Disable CCP negotiation" },
81 { "-ccp", o_bool, &ccp_protent.enabled_flag,
82 "Disable CCP negotiation", OPT_ALIAS },
84 { "bsdcomp", o_special, (void *)setbsdcomp,
85 "Request BSD-Compress packet compression",
86 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value },
87 { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
88 "don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR,
89 &ccp_allowoptions[0].bsd_compress },
90 { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
91 "don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
92 &ccp_allowoptions[0].bsd_compress },
94 { "deflate", o_special, (void *)setdeflate,
95 "request Deflate compression",
96 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value },
97 { "nodeflate", o_bool, &ccp_wantoptions[0].deflate,
98 "don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR,
99 &ccp_allowoptions[0].deflate },
100 { "-deflate", o_bool, &ccp_wantoptions[0].deflate,
101 "don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
102 &ccp_allowoptions[0].deflate },
104 { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft,
105 "don't use draft deflate #", OPT_A2COPY,
106 &ccp_allowoptions[0].deflate_draft },
108 { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
109 "request Predictor-1", OPT_PRIO | 1 },
110 { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1,
111 "don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR,
112 &ccp_allowoptions[0].predictor_1 },
113 { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
114 "don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
115 &ccp_allowoptions[0].predictor_1 },
118 /* MPPE options are symmetrical ... we only set wantoptions here */
119 { "require-mppe", o_bool, &ccp_wantoptions[0].mppe,
120 "require MPPE encryption",
121 OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
122 { "+mppe", o_bool, &ccp_wantoptions[0].mppe,
123 "require MPPE encryption",
124 OPT_ALIAS | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
125 { "nomppe", o_bool, &ccp_wantoptions[0].mppe,
126 "don't allow MPPE encryption", OPT_PRIO },
127 { "-mppe", o_bool, &ccp_wantoptions[0].mppe,
128 "don't allow MPPE encryption", OPT_ALIAS | OPT_PRIO },
130 /* We use ccp_allowoptions[0].mppe as a junk var ... it is reset later */
131 { "require-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
132 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
133 &ccp_wantoptions[0].mppe },
134 { "+mppe-40", o_bool, &ccp_allowoptions[0].mppe,
135 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
136 &ccp_wantoptions[0].mppe },
137 { "nomppe-40", o_bool, &ccp_allowoptions[0].mppe,
138 "don't allow MPPE 40-bit encryption",
139 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40, &ccp_wantoptions[0].mppe },
140 { "-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
141 "don't allow MPPE 40-bit encryption",
142 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40,
143 &ccp_wantoptions[0].mppe },
145 { "require-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
146 "require MPPE 128-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
147 &ccp_wantoptions[0].mppe },
148 { "+mppe-128", o_bool, &ccp_allowoptions[0].mppe,
149 "require MPPE 128-bit encryption",
150 OPT_ALIAS | OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
151 &ccp_wantoptions[0].mppe },
152 { "nomppe-128", o_bool, &ccp_allowoptions[0].mppe,
153 "don't allow MPPE 128-bit encryption",
154 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128, &ccp_wantoptions[0].mppe },
155 { "-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
156 "don't allow MPPE 128-bit encryption",
157 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128,
158 &ccp_wantoptions[0].mppe },
160 /* strange one; we always request stateless, but will we allow stateful? */
161 { "mppe-stateful", o_bool, &refuse_mppe_stateful,
162 "allow MPPE stateful mode", OPT_PRIO },
163 { "nomppe-stateful", o_bool, &refuse_mppe_stateful,
164 "disallow MPPE stateful mode", OPT_PRIO | 1 },
171 * Protocol entry points from main code.
173 static void ccp_init (int unit);
174 static void ccp_open (int unit);
175 static void ccp_close (int unit, char *);
176 static void ccp_lowerup (int unit);
177 static void ccp_lowerdown (int);
178 static void ccp_input (int unit, u_char *pkt, int len);
179 static void ccp_protrej (int unit);
180 static int ccp_printpkt (u_char *pkt, int len,
181 void (*printer)(void *, char *, ...),
183 static void ccp_datainput (int unit, u_char *pkt, int len);
185 struct protent ccp_protent = {
205 fsm ccp_fsm[NUM_PPP];
206 ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */
207 ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */
208 ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */
209 ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */
212 * Callbacks for fsm code.
214 static void ccp_resetci (fsm *);
215 static int ccp_cilen (fsm *);
216 static void ccp_addci (fsm *, u_char *, int *);
217 static int ccp_ackci (fsm *, u_char *, int);
218 static int ccp_nakci (fsm *, u_char *, int, int);
219 static int ccp_rejci (fsm *, u_char *, int);
220 static int ccp_reqci (fsm *, u_char *, int *, int);
221 static void ccp_up (fsm *);
222 static void ccp_down (fsm *);
223 static int ccp_extcode (fsm *, int, int, u_char *, int);
224 static void ccp_rack_timeout (void *);
225 static char *method_name (ccp_options *, ccp_options *);
227 static fsm_callbacks ccp_callbacks = {
246 * Do we want / did we get any compression?
248 #define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \
249 || (opt).predictor_1 || (opt).predictor_2 \
253 * Local state (mainly for handling reset-reqs and reset-acks).
255 static int ccp_localstate[NUM_PPP];
256 #define RACK_PENDING 1 /* waiting for reset-ack */
257 #define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
259 #define RACKTIMEOUT 1 /* second */
261 static int all_rejected[NUM_PPP]; /* we rejected all peer's options */
267 setbsdcomp(char **argv)
273 abits = rbits = strtol(str, &endp, 0);
274 if (endp != str && *endp == ',') {
276 abits = strtol(str, &endp, 0);
278 if (*endp != 0 || endp == str) {
279 option_error("invalid parameter '%s' for bsdcomp option", *argv);
282 if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS))
283 || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) {
284 option_error("bsdcomp option values must be 0 or %d .. %d",
285 BSD_MIN_BITS, BSD_MAX_BITS);
289 ccp_wantoptions[0].bsd_compress = 1;
290 ccp_wantoptions[0].bsd_bits = rbits;
292 ccp_wantoptions[0].bsd_compress = 0;
294 ccp_allowoptions[0].bsd_compress = 1;
295 ccp_allowoptions[0].bsd_bits = abits;
297 ccp_allowoptions[0].bsd_compress = 0;
298 slprintf(bsd_value, sizeof(bsd_value),
299 rbits == abits? "%d": "%d,%d", rbits, abits);
305 setdeflate(char **argv)
311 abits = rbits = strtol(str, &endp, 0);
312 if (endp != str && *endp == ',') {
314 abits = strtol(str, &endp, 0);
316 if (*endp != 0 || endp == str) {
317 option_error("invalid parameter '%s' for deflate option", *argv);
320 if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE))
321 || (abits != 0 && (abits < DEFLATE_MIN_SIZE
322 || abits > DEFLATE_MAX_SIZE))) {
323 option_error("deflate option values must be 0 or %d .. %d",
324 DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE);
327 if (rbits == DEFLATE_MIN_SIZE || abits == DEFLATE_MIN_SIZE) {
328 if (rbits == DEFLATE_MIN_SIZE)
329 rbits = DEFLATE_MIN_WORKS;
330 if (abits == DEFLATE_MIN_SIZE)
331 abits = DEFLATE_MIN_WORKS;
332 warn("deflate option value of %d changed to %d to avoid zlib bug",
333 DEFLATE_MIN_SIZE, DEFLATE_MIN_WORKS);
336 ccp_wantoptions[0].deflate = 1;
337 ccp_wantoptions[0].deflate_size = rbits;
339 ccp_wantoptions[0].deflate = 0;
341 ccp_allowoptions[0].deflate = 1;
342 ccp_allowoptions[0].deflate_size = abits;
344 ccp_allowoptions[0].deflate = 0;
345 slprintf(deflate_value, sizeof(deflate_value),
346 rbits == abits? "%d": "%d,%d", rbits, abits);
352 * ccp_init - initialize CCP.
357 fsm *f = &ccp_fsm[unit];
360 f->protocol = PPP_CCP;
361 f->callbacks = &ccp_callbacks;
364 memset(&ccp_wantoptions[unit], 0, sizeof(ccp_options));
365 memset(&ccp_gotoptions[unit], 0, sizeof(ccp_options));
366 memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
367 memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
369 ccp_wantoptions[0].deflate = 1;
370 ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE;
371 ccp_wantoptions[0].deflate_correct = 1;
372 ccp_wantoptions[0].deflate_draft = 1;
373 ccp_allowoptions[0].deflate = 1;
374 ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE;
375 ccp_allowoptions[0].deflate_correct = 1;
376 ccp_allowoptions[0].deflate_draft = 1;
378 ccp_wantoptions[0].bsd_compress = 1;
379 ccp_wantoptions[0].bsd_bits = BSD_MAX_BITS;
380 ccp_allowoptions[0].bsd_compress = 1;
381 ccp_allowoptions[0].bsd_bits = BSD_MAX_BITS;
383 ccp_allowoptions[0].predictor_1 = 1;
387 * ccp_open - CCP is allowed to come up.
392 fsm *f = &ccp_fsm[unit];
394 if (f->state != OPENED)
395 ccp_flags_set(unit, 1, 0);
398 * Find out which compressors the kernel supports before
399 * deciding whether to open in silent mode.
402 if (!ANY_COMPRESS(ccp_gotoptions[unit]))
403 f->flags |= OPT_SILENT;
409 * ccp_close - Terminate CCP.
412 ccp_close(int unit, char *reason)
414 ccp_flags_set(unit, 0, 0);
415 fsm_close(&ccp_fsm[unit], reason);
419 * ccp_lowerup - we may now transmit CCP packets.
422 ccp_lowerup(int unit)
424 fsm_lowerup(&ccp_fsm[unit]);
428 * ccp_lowerdown - we may not transmit CCP packets.
431 ccp_lowerdown(int unit)
433 fsm_lowerdown(&ccp_fsm[unit]);
437 * ccp_input - process a received CCP packet.
440 ccp_input(int unit, u_char *p, int len)
442 fsm *f = &ccp_fsm[unit];
446 * Check for a terminate-request so we can print a message.
449 fsm_input(f, p, len);
450 if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED) {
451 notice("Compression disabled by peer.");
453 if (ccp_gotoptions[unit].mppe) {
454 error("MPPE disabled, closing LCP");
455 lcp_close(unit, "MPPE disabled by peer");
461 * If we get a terminate-ack and we're not asking for compression,
464 if (oldstate == REQSENT && p[0] == TERMACK
465 && !ANY_COMPRESS(ccp_gotoptions[unit]))
466 ccp_close(unit, "No compression negotiated");
470 * Handle a CCP-specific code.
473 ccp_extcode(fsm *f, int code, int id, u_char *p, int len)
477 if (f->state != OPENED)
479 /* send a reset-ack, which the transmitter will see and
480 reset its compression state. */
481 fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
485 if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) {
486 ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT);
487 UNTIMEOUT(ccp_rack_timeout, f);
499 * ccp_protrej - peer doesn't talk CCP.
502 ccp_protrej(int unit)
504 ccp_flags_set(unit, 0, 0);
505 fsm_lowerdown(&ccp_fsm[unit]);
508 if (ccp_gotoptions[unit].mppe) {
509 error("MPPE required but peer negotiation failed");
510 lcp_close(unit, "MPPE required but peer negotiation failed");
517 * ccp_resetci - initialize at start of negotiation.
522 ccp_options *go = &ccp_gotoptions[f->unit];
523 u_char opt_buf[CCP_MAX_OPTION_LENGTH];
525 *go = ccp_wantoptions[f->unit];
526 all_rejected[f->unit] = 0;
530 ccp_options *ao = &ccp_allowoptions[f->unit];
531 int auth_mschap_bits = auth_done[f->unit];
532 #ifdef PPP_WITH_EAPTLS
533 int auth_eap_bits = auth_done[f->unit];
538 * Start with a basic sanity check: mschap[v2] auth must be in
539 * exactly one direction. RFC 3079 says that the keys are
540 * 'derived from the credentials of the peer that initiated the call',
541 * however the PPP protocol doesn't have such a concept, and pppd
542 * cannot get this info externally. Instead we do the best we can.
543 * NB: If MPPE is required, all other compression opts are invalid.
544 * So, we return right away if we can't do it.
547 /* Leave only the mschap auth bits set */
548 auth_mschap_bits &= (CHAP_MS_WITHPEER | CHAP_MS_PEER |
549 CHAP_MS2_WITHPEER | CHAP_MS2_PEER);
550 /* Count the mschap auths */
551 auth_mschap_bits >>= CHAP_MS_SHIFT;
554 numbits += auth_mschap_bits & 1;
555 auth_mschap_bits >>= 1;
556 } while (auth_mschap_bits);
558 error("MPPE required, but auth done in both directions.");
559 lcp_close(f->unit, "MPPE required but not available");
563 #ifdef PPP_WITH_EAPTLS
565 * MPPE is also possible in combination with EAP-TLS.
566 * It is not possible to detect if we're doing EAP or EAP-TLS
567 * at this stage, hence we accept all forms of EAP. If TLS is
568 * not used then the MPPE keys will not be derived anyway.
570 /* Leave only the eap auth bits set */
571 auth_eap_bits &= (EAP_WITHPEER | EAP_PEER );
573 if ((numbits == 0) && (auth_eap_bits == 0)) {
574 error("MPPE required, but MS-CHAP[v2] nor EAP-TLS auth are performed.");
577 error("MPPE required, but MS-CHAP[v2] auth not performed.");
579 lcp_close(f->unit, "MPPE required but not available");
583 /* A plugin (eg radius) may not have obtained key material. */
584 if (!mppe_keys_isset()) {
585 error("MPPE required, but keys are not available. "
586 "Possible plugin problem?");
587 lcp_close(f->unit, "MPPE required but not available");
591 /* LM auth not supported for MPPE */
592 if (auth_done[f->unit] & (CHAP_MS_WITHPEER | CHAP_MS_PEER)) {
593 /* This might be noise */
594 if (go->mppe & MPPE_OPT_40) {
595 notice("Disabling 40-bit MPPE; MS-CHAP LM not supported");
596 go->mppe &= ~MPPE_OPT_40;
597 ccp_wantoptions[f->unit].mppe &= ~MPPE_OPT_40;
601 /* Last check: can we actually negotiate something? */
602 if (!(go->mppe & (MPPE_OPT_40 | MPPE_OPT_128))) {
603 /* Could be misconfig, could be 40-bit disabled above. */
604 error("MPPE required, but both 40-bit and 128-bit disabled.");
605 lcp_close(f->unit, "MPPE required but not available");
611 /* MPPE is not compatible with other compression types */
612 ao->bsd_compress = go->bsd_compress = 0;
613 ao->predictor_1 = go->predictor_1 = 0;
614 ao->predictor_2 = go->predictor_2 = 0;
615 ao->deflate = go->deflate = 0;
619 * Check whether the kernel knows about the various
620 * compression methods we might request.
623 opt_buf[0] = CI_MPPE;
624 opt_buf[1] = CILEN_MPPE;
625 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
626 /* Key material unimportant here. */
627 if (ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0) <= 0) {
628 error("MPPE required, but kernel has no support.");
629 lcp_close(f->unit, "MPPE required but not available");
632 #endif /* PPP_WITH_MPPE */
633 if (go->bsd_compress) {
634 opt_buf[0] = CI_BSD_COMPRESS;
635 opt_buf[1] = CILEN_BSD_COMPRESS;
636 opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS);
637 if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0)
638 go->bsd_compress = 0;
641 if (go->deflate_correct) {
642 opt_buf[0] = CI_DEFLATE;
643 opt_buf[1] = CILEN_DEFLATE;
644 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
645 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
646 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
647 go->deflate_correct = 0;
649 if (go->deflate_draft) {
650 opt_buf[0] = CI_DEFLATE_DRAFT;
651 opt_buf[1] = CILEN_DEFLATE;
652 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
653 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
654 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
655 go->deflate_draft = 0;
657 if (!go->deflate_correct && !go->deflate_draft)
660 if (go->predictor_1) {
661 opt_buf[0] = CI_PREDICTOR_1;
662 opt_buf[1] = CILEN_PREDICTOR_1;
663 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
666 if (go->predictor_2) {
667 opt_buf[0] = CI_PREDICTOR_2;
668 opt_buf[1] = CILEN_PREDICTOR_2;
669 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
675 * ccp_cilen - Return total length of our configuration info.
680 ccp_options *go = &ccp_gotoptions[f->unit];
682 return (go->bsd_compress? CILEN_BSD_COMPRESS: 0)
683 + (go->deflate && go->deflate_correct? CILEN_DEFLATE: 0)
684 + (go->deflate && go->deflate_draft? CILEN_DEFLATE: 0)
685 + (go->predictor_1? CILEN_PREDICTOR_1: 0)
686 + (go->predictor_2? CILEN_PREDICTOR_2: 0)
687 + (go->mppe? CILEN_MPPE: 0);
691 * ccp_addci - put our requests in a packet.
694 ccp_addci(fsm *f, u_char *p, int *lenp)
697 ccp_options *go = &ccp_gotoptions[f->unit];
701 * Add the compression types that we can receive, in decreasing
702 * preference order. Get the kernel to allocate the first one
703 * in case it gets Acked.
707 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
709 p[0] = opt_buf[0] = CI_MPPE;
710 p[1] = opt_buf[1] = CILEN_MPPE;
711 MPPE_OPTS_TO_CI(go->mppe, &p[2]);
712 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
713 mppe_get_recv_key(&opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
714 res = ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0);
718 /* This shouldn't happen, we've already tested it! */
719 lcp_close(f->unit, "MPPE required but not available in kernel");
723 p[0] = go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT;
724 p[1] = CILEN_DEFLATE;
725 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
726 p[3] = DEFLATE_CHK_SEQUENCE;
731 if (go->deflate_size < DEFLATE_MIN_WORKS) {
735 res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
739 } else if (res < 0) {
744 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
747 if (p != p0 && go->deflate_correct && go->deflate_draft) {
748 p[0] = CI_DEFLATE_DRAFT;
749 p[1] = CILEN_DEFLATE;
750 p[2] = p[2 - CILEN_DEFLATE];
751 p[3] = DEFLATE_CHK_SEQUENCE;
755 if (go->bsd_compress) {
756 p[0] = CI_BSD_COMPRESS;
757 p[1] = CILEN_BSD_COMPRESS;
758 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
760 p += CILEN_BSD_COMPRESS; /* not the first option */
763 if (go->bsd_bits < BSD_MIN_BITS) {
764 go->bsd_compress = 0;
767 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0);
769 p += CILEN_BSD_COMPRESS;
771 } else if (res < 0) {
772 go->bsd_compress = 0;
776 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
780 /* XXX Should Predictor 2 be preferable to Predictor 1? */
781 if (go->predictor_1) {
782 p[0] = CI_PREDICTOR_1;
783 p[1] = CILEN_PREDICTOR_1;
784 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) {
787 p += CILEN_PREDICTOR_1;
790 if (go->predictor_2) {
791 p[0] = CI_PREDICTOR_2;
792 p[1] = CILEN_PREDICTOR_2;
793 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) {
796 p += CILEN_PREDICTOR_2;
800 go->method = (p > p0)? p0[0]: -1;
806 * ccp_ackci - process a received configure-ack, and return
807 * 1 iff the packet was OK.
810 ccp_ackci(fsm *f, u_char *p, int len)
812 ccp_options *go = &ccp_gotoptions[f->unit];
817 u_char opt_buf[CILEN_MPPE];
819 opt_buf[0] = CI_MPPE;
820 opt_buf[1] = CILEN_MPPE;
821 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
822 if (len < CILEN_MPPE || memcmp(opt_buf, p, CILEN_MPPE))
826 /* XXX Cope with first/fast ack */
832 if (len < CILEN_DEFLATE
833 || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
834 || p[1] != CILEN_DEFLATE
835 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
836 || p[3] != DEFLATE_CHK_SEQUENCE)
839 len -= CILEN_DEFLATE;
840 /* XXX Cope with first/fast ack */
843 if (go->deflate_correct && go->deflate_draft) {
844 if (len < CILEN_DEFLATE
845 || p[0] != CI_DEFLATE_DRAFT
846 || p[1] != CILEN_DEFLATE
847 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
848 || p[3] != DEFLATE_CHK_SEQUENCE)
851 len -= CILEN_DEFLATE;
854 if (go->bsd_compress) {
855 if (len < CILEN_BSD_COMPRESS
856 || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
857 || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
859 p += CILEN_BSD_COMPRESS;
860 len -= CILEN_BSD_COMPRESS;
861 /* XXX Cope with first/fast ack */
862 if (p == p0 && len == 0)
865 if (go->predictor_1) {
866 if (len < CILEN_PREDICTOR_1
867 || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
869 p += CILEN_PREDICTOR_1;
870 len -= CILEN_PREDICTOR_1;
871 /* XXX Cope with first/fast ack */
872 if (p == p0 && len == 0)
875 if (go->predictor_2) {
876 if (len < CILEN_PREDICTOR_2
877 || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
879 p += CILEN_PREDICTOR_2;
880 len -= CILEN_PREDICTOR_2;
881 /* XXX Cope with first/fast ack */
882 if (p == p0 && len == 0)
892 * ccp_nakci - process received configure-nak.
893 * Returns 1 iff the nak was OK.
896 ccp_nakci(fsm *f, u_char *p, int len, int treat_as_reject)
898 ccp_options *go = &ccp_gotoptions[f->unit];
899 ccp_options no; /* options we've seen already */
900 ccp_options try; /* options to ask for next time */
902 memset(&no, 0, sizeof(no));
906 if (go->mppe && len >= CILEN_MPPE
907 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
910 * Peer wants us to use a different strength or other setting.
911 * Fail if we aren't willing to use his suggestion.
913 MPPE_CI_TO_OPTS(&p[2], try.mppe);
914 if ((try.mppe & MPPE_OPT_STATEFUL) && refuse_mppe_stateful) {
915 error("Refusing MPPE stateful mode offered by peer");
917 } else if (((go->mppe | MPPE_OPT_STATEFUL) & try.mppe) != try.mppe) {
918 /* Peer must have set options we didn't request (suggest) */
923 error("MPPE required but peer negotiation failed");
924 lcp_close(f->unit, "MPPE required but peer negotiation failed");
927 #endif /* PPP_WITH_MPPE */
928 if (go->deflate && len >= CILEN_DEFLATE
929 && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
930 && p[1] == CILEN_DEFLATE) {
933 * Peer wants us to use a different code size or something.
934 * Stop asking for Deflate if we don't understand his suggestion.
936 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
937 || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_WORKS
938 || p[3] != DEFLATE_CHK_SEQUENCE)
940 else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
941 try.deflate_size = DEFLATE_SIZE(p[2]);
943 len -= CILEN_DEFLATE;
944 if (go->deflate_correct && go->deflate_draft
945 && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
946 && p[1] == CILEN_DEFLATE) {
948 len -= CILEN_DEFLATE;
952 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
953 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
956 * Peer wants us to use a different number of bits
957 * or a different version.
959 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
960 try.bsd_compress = 0;
961 else if (BSD_NBITS(p[2]) < go->bsd_bits)
962 try.bsd_bits = BSD_NBITS(p[2]);
963 p += CILEN_BSD_COMPRESS;
964 len -= CILEN_BSD_COMPRESS;
968 * Predictor-1 and 2 have no options, so they can't be Naked.
970 * There may be remaining options but we ignore them.
973 if (f->state != OPENED)
979 * ccp_rejci - reject some of our suggested compression methods.
982 ccp_rejci(fsm *f, u_char *p, int len)
984 ccp_options *go = &ccp_gotoptions[f->unit];
985 ccp_options try; /* options to request next time */
990 * Cope with empty configure-rejects by ceasing to send
991 * configure-requests.
993 if (len == 0 && all_rejected[f->unit])
997 if (go->mppe && len >= CILEN_MPPE
998 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
999 error("MPPE required but peer refused");
1000 lcp_close(f->unit, "MPPE required but peer refused");
1005 if (go->deflate_correct && len >= CILEN_DEFLATE
1006 && p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
1007 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1008 || p[3] != DEFLATE_CHK_SEQUENCE)
1009 return 0; /* Rej is bad */
1010 try.deflate_correct = 0;
1012 len -= CILEN_DEFLATE;
1014 if (go->deflate_draft && len >= CILEN_DEFLATE
1015 && p[0] == CI_DEFLATE_DRAFT && p[1] == CILEN_DEFLATE) {
1016 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1017 || p[3] != DEFLATE_CHK_SEQUENCE)
1018 return 0; /* Rej is bad */
1019 try.deflate_draft = 0;
1021 len -= CILEN_DEFLATE;
1023 if (!try.deflate_correct && !try.deflate_draft)
1025 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
1026 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
1027 if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
1029 try.bsd_compress = 0;
1030 p += CILEN_BSD_COMPRESS;
1031 len -= CILEN_BSD_COMPRESS;
1033 if (go->predictor_1 && len >= CILEN_PREDICTOR_1
1034 && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
1035 try.predictor_1 = 0;
1036 p += CILEN_PREDICTOR_1;
1037 len -= CILEN_PREDICTOR_1;
1039 if (go->predictor_2 && len >= CILEN_PREDICTOR_2
1040 && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
1041 try.predictor_2 = 0;
1042 p += CILEN_PREDICTOR_2;
1043 len -= CILEN_PREDICTOR_2;
1049 if (f->state != OPENED)
1056 * ccp_reqci - processed a received configure-request.
1057 * Returns CONFACK, CONFNAK or CONFREJ and the packet modified
1061 ccp_reqci(fsm *f, u_char *p, int *lenp, int dont_nak)
1063 int ret, newret, res;
1065 int len, clen, type, nb;
1066 ccp_options *ho = &ccp_hisoptions[f->unit];
1067 ccp_options *ao = &ccp_allowoptions[f->unit];
1068 #ifdef PPP_WITH_MPPE
1069 bool rej_for_ci_mppe = 1; /* Are we rejecting based on a bad/missing */
1070 /* CI_MPPE, or due to other options? */
1077 memset(ho, 0, sizeof(ccp_options));
1078 ho->method = (len > 0)? p[0]: -1;
1082 if (len < 2 || p[1] < 2 || p[1] > len) {
1092 #ifdef PPP_WITH_MPPE
1094 if (!ao->mppe || clen != CILEN_MPPE) {
1098 MPPE_CI_TO_OPTS(&p[2], ho->mppe);
1100 /* Nak if anything unsupported or unknown are set. */
1101 if (ho->mppe & MPPE_OPT_UNSUPPORTED) {
1103 ho->mppe &= ~MPPE_OPT_UNSUPPORTED;
1105 if (ho->mppe & MPPE_OPT_UNKNOWN) {
1107 ho->mppe &= ~MPPE_OPT_UNKNOWN;
1110 /* Check state opt */
1111 if (ho->mppe & MPPE_OPT_STATEFUL) {
1113 * We can Nak and request stateless, but it's a
1114 * lot easier to just assume the peer will request
1115 * it if he can do it; stateful mode is bad over
1116 * the Internet -- which is where we expect MPPE.
1118 if (refuse_mppe_stateful) {
1119 error("Refusing MPPE stateful mode offered by peer");
1125 /* Find out which of {S,L} are set. */
1126 if ((ho->mppe & MPPE_OPT_128)
1127 && (ho->mppe & MPPE_OPT_40)) {
1128 /* Both are set, negotiate the strongest. */
1130 if (ao->mppe & MPPE_OPT_128)
1131 ho->mppe &= ~MPPE_OPT_40;
1132 else if (ao->mppe & MPPE_OPT_40)
1133 ho->mppe &= ~MPPE_OPT_128;
1138 } else if (ho->mppe & MPPE_OPT_128) {
1139 if (!(ao->mppe & MPPE_OPT_128)) {
1143 } else if (ho->mppe & MPPE_OPT_40) {
1144 if (!(ao->mppe & MPPE_OPT_40)) {
1149 /* Neither are set. */
1150 /* We cannot accept this. */
1152 /* Give the peer our idea of what can be used,
1153 so it can choose and confirm */
1154 ho->mppe = ao->mppe;
1157 /* rebuild the opts */
1158 MPPE_OPTS_TO_CI(ho->mppe, &p[2]);
1159 if (newret == CONFACK) {
1160 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
1163 BCOPY(p, opt_buf, CILEN_MPPE);
1164 mppe_get_send_key(&opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
1165 if (ccp_test(f->unit, opt_buf,
1166 CILEN_MPPE + MPPE_MAX_KEY_LEN, 1) <= 0) {
1167 /* This shouldn't happen, we've already tested it! */
1168 error("MPPE required, but kernel has no support.");
1169 lcp_close(f->unit, "MPPE required but not available");
1174 * We need to decrease the interface MTU by MPPE_PAD
1175 * because MPPE frames **grow**. The kernel [must]
1176 * allocate MPPE_PAD extra bytes in xmit buffers.
1178 mtu = netif_get_mtu(f->unit);
1180 netif_set_mtu(f->unit, mtu - MPPE_PAD);
1186 * We have accepted MPPE or are willing to negotiate
1187 * MPPE parameters. A CONFREJ is due to subsequent
1188 * (non-MPPE) processing.
1190 rej_for_ci_mppe = 0;
1192 #endif /* PPP_WITH_MPPE */
1194 case CI_DEFLATE_DRAFT:
1195 if (!ao->deflate || clen != CILEN_DEFLATE
1196 || (!ao->deflate_correct && type == CI_DEFLATE)
1197 || (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) {
1203 ho->deflate_size = nb = DEFLATE_SIZE(p[2]);
1204 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
1205 || p[3] != DEFLATE_CHK_SEQUENCE
1206 || nb > ao->deflate_size || nb < DEFLATE_MIN_WORKS) {
1209 p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
1210 p[3] = DEFLATE_CHK_SEQUENCE;
1211 /* fall through to test this #bits below */
1217 * Check whether we can do Deflate with the window
1218 * size they want. If the window is too big, reduce
1219 * it until the kernel can cope and nak with that.
1220 * We only check this for the first option.
1224 res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
1226 break; /* it's OK now */
1227 if (res < 0 || nb == DEFLATE_MIN_WORKS || dont_nak) {
1229 p[2] = DEFLATE_MAKE_OPT(ho->deflate_size);
1234 p[2] = DEFLATE_MAKE_OPT(nb);
1239 case CI_BSD_COMPRESS:
1240 if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) {
1245 ho->bsd_compress = 1;
1246 ho->bsd_bits = nb = BSD_NBITS(p[2]);
1247 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
1248 || nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
1251 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
1252 /* fall through to test this #bits below */
1258 * Check whether we can do BSD-Compress with the code
1259 * size they want. If the code size is too big, reduce
1260 * it until the kernel can cope and nak with that.
1261 * We only check this for the first option.
1265 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1);
1268 if (res < 0 || nb == BSD_MIN_BITS || dont_nak) {
1270 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION,
1276 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
1281 case CI_PREDICTOR_1:
1282 if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) {
1287 ho->predictor_1 = 1;
1289 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
1294 case CI_PREDICTOR_2:
1295 if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) {
1300 ho->predictor_2 = 1;
1302 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
1312 if (newret == CONFNAK && dont_nak)
1314 if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) {
1315 /* we're returning this option */
1316 if (newret == CONFREJ && ret == CONFNAK)
1320 BCOPY(p, retp, clen);
1328 if (ret != CONFACK) {
1329 if (ret == CONFREJ && *lenp == retp - p0)
1330 all_rejected[f->unit] = 1;
1334 #ifdef PPP_WITH_MPPE
1335 if (ret == CONFREJ && ao->mppe && rej_for_ci_mppe) {
1336 error("MPPE required but peer negotiation failed");
1337 lcp_close(f->unit, "MPPE required but peer negotiation failed");
1344 * Make a string name for a compression method (or 2).
1347 method_name(ccp_options *opt, ccp_options *opt2)
1349 static char result[64];
1351 if (!ANY_COMPRESS(*opt))
1353 switch (opt->method) {
1354 #ifdef PPP_WITH_MPPE
1358 char *q = result + sizeof(result); /* 1 past result */
1360 slprintf(p, q - p, "MPPE ");
1362 if (opt->mppe & MPPE_OPT_128) {
1363 slprintf(p, q - p, "128-bit ");
1366 if (opt->mppe & MPPE_OPT_40) {
1367 slprintf(p, q - p, "40-bit ");
1370 if (opt->mppe & MPPE_OPT_STATEFUL)
1371 slprintf(p, q - p, "stateful");
1373 slprintf(p, q - p, "stateless");
1379 case CI_DEFLATE_DRAFT:
1380 if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
1381 slprintf(result, sizeof(result), "Deflate%s (%d/%d)",
1382 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1383 opt->deflate_size, opt2->deflate_size);
1385 slprintf(result, sizeof(result), "Deflate%s (%d)",
1386 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1389 case CI_BSD_COMPRESS:
1390 if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
1391 slprintf(result, sizeof(result), "BSD-Compress (%d/%d)",
1392 opt->bsd_bits, opt2->bsd_bits);
1394 slprintf(result, sizeof(result), "BSD-Compress (%d)",
1397 case CI_PREDICTOR_1:
1398 return "Predictor 1";
1399 case CI_PREDICTOR_2:
1400 return "Predictor 2";
1402 slprintf(result, sizeof(result), "Method %d", opt->method);
1408 * CCP has come up - inform the kernel driver and log a message.
1413 ccp_options *go = &ccp_gotoptions[f->unit];
1414 ccp_options *ho = &ccp_hisoptions[f->unit];
1417 ccp_flags_set(f->unit, 1, 1);
1418 if (ANY_COMPRESS(*go)) {
1419 if (ANY_COMPRESS(*ho)) {
1420 if (go->method == ho->method) {
1421 notice("%s compression enabled", method_name(go, ho));
1423 strlcpy(method1, method_name(go, NULL), sizeof(method1));
1424 notice("%s / %s compression enabled",
1425 method1, method_name(ho, NULL));
1428 notice("%s receive compression enabled", method_name(go, NULL));
1429 } else if (ANY_COMPRESS(*ho))
1430 notice("%s transmit compression enabled", method_name(ho, NULL));
1431 #ifdef PPP_WITH_MPPE
1434 continue_networks(f->unit); /* Bring up IP et al */
1440 * CCP has gone down - inform the kernel driver.
1445 if (ccp_localstate[f->unit] & RACK_PENDING)
1446 UNTIMEOUT(ccp_rack_timeout, f);
1447 ccp_localstate[f->unit] = 0;
1448 ccp_flags_set(f->unit, 1, 0);
1449 #ifdef PPP_WITH_MPPE
1450 if (ccp_gotoptions[f->unit].mppe) {
1451 ccp_gotoptions[f->unit].mppe = 0;
1452 if (lcp_fsm[f->unit].state == OPENED) {
1453 /* If LCP is not already going down, make sure it does. */
1454 error("MPPE disabled");
1455 lcp_close(f->unit, "MPPE disabled");
1462 * Print the contents of a CCP packet.
1464 static char *ccp_codenames[] = {
1465 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1466 "TermReq", "TermAck", "CodeRej",
1467 NULL, NULL, NULL, NULL, NULL, NULL,
1468 "ResetReq", "ResetAck",
1472 ccp_printpkt(u_char *p, int plen,
1473 void (*printer) (void *, char *, ...), void *arg)
1475 u_char *p0, *optend;
1480 if (plen < HEADERLEN)
1484 len = (p[2] << 8) + p[3];
1485 if (len < HEADERLEN || len > plen)
1488 if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *)
1489 && ccp_codenames[code-1] != NULL)
1490 printer(arg, " %s", ccp_codenames[code-1]);
1492 printer(arg, " code=0x%x", code);
1493 printer(arg, " id=0x%x", id);
1502 /* print list of possible compression methods */
1506 if (optlen < 2 || optlen > len)
1510 optend = p + optlen;
1512 #ifdef PPP_WITH_MPPE
1514 if (optlen >= CILEN_MPPE) {
1517 MPPE_CI_TO_OPTS(&p[2], mppe_opts);
1518 printer(arg, "mppe %s %s %s %s %s %s%s",
1519 (p[2] & MPPE_H_BIT)? "+H": "-H",
1520 (p[5] & MPPE_M_BIT)? "+M": "-M",
1521 (p[5] & MPPE_S_BIT)? "+S": "-S",
1522 (p[5] & MPPE_L_BIT)? "+L": "-L",
1523 (p[5] & MPPE_D_BIT)? "+D": "-D",
1524 (p[5] & MPPE_C_BIT)? "+C": "-C",
1525 (mppe_opts & MPPE_OPT_UNKNOWN)? " +U": "");
1526 if (mppe_opts & MPPE_OPT_UNKNOWN)
1527 printer(arg, " (%.2x %.2x %.2x %.2x)",
1528 p[2], p[3], p[4], p[5]);
1534 case CI_DEFLATE_DRAFT:
1535 if (optlen >= CILEN_DEFLATE) {
1536 printer(arg, "deflate%s %d",
1537 (code == CI_DEFLATE_DRAFT? "(old#)": ""),
1538 DEFLATE_SIZE(p[2]));
1539 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
1540 printer(arg, " method %d", DEFLATE_METHOD(p[2]));
1541 if (p[3] != DEFLATE_CHK_SEQUENCE)
1542 printer(arg, " check %d", p[3]);
1546 case CI_BSD_COMPRESS:
1547 if (optlen >= CILEN_BSD_COMPRESS) {
1548 printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
1550 p += CILEN_BSD_COMPRESS;
1553 case CI_PREDICTOR_1:
1554 if (optlen >= CILEN_PREDICTOR_1) {
1555 printer(arg, "predictor 1");
1556 p += CILEN_PREDICTOR_1;
1559 case CI_PREDICTOR_2:
1560 if (optlen >= CILEN_PREDICTOR_2) {
1561 printer(arg, "predictor 2");
1562 p += CILEN_PREDICTOR_2;
1567 printer(arg, " %.2x", *p++);
1574 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1575 print_string((char *)p, len, printer, arg);
1582 /* dump out the rest of the packet in hex */
1584 printer(arg, " %.2x", *p++);
1590 * We have received a packet that the decompressor failed to
1591 * decompress. Here we would expect to issue a reset-request, but
1592 * Motorola has a patent on resetting the compressor as a result of
1593 * detecting an error in the decompressed data after decompression.
1594 * (See US patent 5,130,993; international patent publication number
1595 * WO 91/10289; Australian patent 73296/91.)
1597 * So we ask the kernel whether the error was detected after
1598 * decompression; if it was, we take CCP down, thus disabling
1599 * compression :-(, otherwise we issue the reset-request.
1602 ccp_datainput(int unit, u_char *pkt, int len)
1607 if (f->state == OPENED) {
1608 if (ccp_fatal_error(unit)) {
1610 * Disable compression by taking CCP down.
1612 error("Lost compression sync: disabling compression");
1613 ccp_close(unit, "Lost compression sync");
1614 #ifdef PPP_WITH_MPPE
1616 * If we were doing MPPE, we must also take the link down.
1618 if (ccp_gotoptions[unit].mppe) {
1619 error("Too many MPPE errors, closing LCP");
1620 lcp_close(unit, "Too many MPPE errors");
1625 * Send a reset-request to reset the peer's compressor.
1626 * We don't do that if we are still waiting for an
1627 * acknowledgement to a previous reset-request.
1629 if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
1630 fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
1631 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1632 ccp_localstate[f->unit] |= RACK_PENDING;
1634 ccp_localstate[f->unit] |= RREQ_REPEAT;
1640 * Timeout waiting for reset-ack.
1643 ccp_rack_timeout(void *arg)
1647 if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
1648 fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
1649 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1650 ccp_localstate[f->unit] &= ~RREQ_REPEAT;
1652 ccp_localstate[f->unit] &= ~RACK_PENDING;