2 * ccp.c - PPP Compression Control Protocol.
4 * Copyright (c) 1994-2002 Paul Mackerras. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. The name(s) of the authors of this software must not be used to
14 * endorse or promote products derived from this software without
15 * prior written permission.
17 * 3. Redistributions of any form whatsoever must retain the following
19 * "This product includes software developed by Paul Mackerras
20 * <paulus@samba.org>".
22 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
23 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
24 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
26 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
27 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
28 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
31 #define RCSID "$Id: ccp.c,v 1.50 2005/06/26 19:34:41 carlsonj Exp $"
39 #include <net/ppp-comp.h>
42 #include "chap_ms.h" /* mppe_xxxx_key, mppe_keys_set */
43 #include "lcp.h" /* lcp_close(), lcp_fsm */
48 * Unfortunately there is a bug in zlib which means that using a
49 * size of 8 (window size = 256) for Deflate compression will cause
50 * buffer overruns and kernel crashes in the deflate module.
51 * Until this is fixed we only accept sizes in the range 9 .. 15.
52 * Thanks to James Carlson for pointing this out.
54 #define DEFLATE_MIN_WORKS 9
57 * Command-line options.
59 static int setbsdcomp __P((char **));
60 static int setdeflate __P((char **));
61 static char bsd_value[8];
62 static char deflate_value[8];
68 bool refuse_mppe_stateful = 1; /* Allow stateful mode? */
71 static option_t ccp_option_list[] = {
72 { "noccp", o_bool, &ccp_protent.enabled_flag,
73 "Disable CCP negotiation" },
74 { "-ccp", o_bool, &ccp_protent.enabled_flag,
75 "Disable CCP negotiation", OPT_ALIAS },
77 { "bsdcomp", o_special, (void *)setbsdcomp,
78 "Request BSD-Compress packet compression",
79 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value },
80 { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
81 "don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR,
82 &ccp_allowoptions[0].bsd_compress },
83 { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
84 "don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
85 &ccp_allowoptions[0].bsd_compress },
87 { "deflate", o_special, (void *)setdeflate,
88 "request Deflate compression",
89 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value },
90 { "nodeflate", o_bool, &ccp_wantoptions[0].deflate,
91 "don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR,
92 &ccp_allowoptions[0].deflate },
93 { "-deflate", o_bool, &ccp_wantoptions[0].deflate,
94 "don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
95 &ccp_allowoptions[0].deflate },
97 { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft,
98 "don't use draft deflate #", OPT_A2COPY,
99 &ccp_allowoptions[0].deflate_draft },
101 { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
102 "request Predictor-1", OPT_PRIO | 1 },
103 { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1,
104 "don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR,
105 &ccp_allowoptions[0].predictor_1 },
106 { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
107 "don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
108 &ccp_allowoptions[0].predictor_1 },
111 /* MPPE options are symmetrical ... we only set wantoptions here */
112 { "require-mppe", o_bool, &ccp_wantoptions[0].mppe,
113 "require MPPE encryption",
114 OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
115 { "+mppe", o_bool, &ccp_wantoptions[0].mppe,
116 "require MPPE encryption",
117 OPT_ALIAS | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 },
118 { "nomppe", o_bool, &ccp_wantoptions[0].mppe,
119 "don't allow MPPE encryption", OPT_PRIO },
120 { "-mppe", o_bool, &ccp_wantoptions[0].mppe,
121 "don't allow MPPE encryption", OPT_ALIAS | OPT_PRIO },
123 /* We use ccp_allowoptions[0].mppe as a junk var ... it is reset later */
124 { "require-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
125 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
126 &ccp_wantoptions[0].mppe },
127 { "+mppe-40", o_bool, &ccp_allowoptions[0].mppe,
128 "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40,
129 &ccp_wantoptions[0].mppe },
130 { "nomppe-40", o_bool, &ccp_allowoptions[0].mppe,
131 "don't allow MPPE 40-bit encryption",
132 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40, &ccp_wantoptions[0].mppe },
133 { "-mppe-40", o_bool, &ccp_allowoptions[0].mppe,
134 "don't allow MPPE 40-bit encryption",
135 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40,
136 &ccp_wantoptions[0].mppe },
138 { "require-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
139 "require MPPE 128-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
140 &ccp_wantoptions[0].mppe },
141 { "+mppe-128", o_bool, &ccp_allowoptions[0].mppe,
142 "require MPPE 128-bit encryption",
143 OPT_ALIAS | OPT_PRIO | OPT_A2OR | MPPE_OPT_128,
144 &ccp_wantoptions[0].mppe },
145 { "nomppe-128", o_bool, &ccp_allowoptions[0].mppe,
146 "don't allow MPPE 128-bit encryption",
147 OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128, &ccp_wantoptions[0].mppe },
148 { "-mppe-128", o_bool, &ccp_allowoptions[0].mppe,
149 "don't allow MPPE 128-bit encryption",
150 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128,
151 &ccp_wantoptions[0].mppe },
153 /* strange one; we always request stateless, but will we allow stateful? */
154 { "mppe-stateful", o_bool, &refuse_mppe_stateful,
155 "allow MPPE stateful mode", OPT_PRIO },
156 { "nomppe-stateful", o_bool, &refuse_mppe_stateful,
157 "disallow MPPE stateful mode", OPT_PRIO | 1 },
164 * Protocol entry points from main code.
166 static void ccp_init __P((int unit));
167 static void ccp_open __P((int unit));
168 static void ccp_close __P((int unit, char *));
169 static void ccp_lowerup __P((int unit));
170 static void ccp_lowerdown __P((int));
171 static void ccp_input __P((int unit, u_char *pkt, int len));
172 static void ccp_protrej __P((int unit));
173 static int ccp_printpkt __P((u_char *pkt, int len,
174 void (*printer) __P((void *, char *, ...)),
176 static void ccp_datainput __P((int unit, u_char *pkt, int len));
178 struct protent ccp_protent = {
198 fsm ccp_fsm[NUM_PPP];
199 ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */
200 ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */
201 ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */
202 ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */
205 * Callbacks for fsm code.
207 static void ccp_resetci __P((fsm *));
208 static int ccp_cilen __P((fsm *));
209 static void ccp_addci __P((fsm *, u_char *, int *));
210 static int ccp_ackci __P((fsm *, u_char *, int));
211 static int ccp_nakci __P((fsm *, u_char *, int, int));
212 static int ccp_rejci __P((fsm *, u_char *, int));
213 static int ccp_reqci __P((fsm *, u_char *, int *, int));
214 static void ccp_up __P((fsm *));
215 static void ccp_down __P((fsm *));
216 static int ccp_extcode __P((fsm *, int, int, u_char *, int));
217 static void ccp_rack_timeout __P((void *));
218 static char *method_name __P((ccp_options *, ccp_options *));
220 static fsm_callbacks ccp_callbacks = {
239 * Do we want / did we get any compression?
241 #define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \
242 || (opt).predictor_1 || (opt).predictor_2 \
246 * Local state (mainly for handling reset-reqs and reset-acks).
248 static int ccp_localstate[NUM_PPP];
249 #define RACK_PENDING 1 /* waiting for reset-ack */
250 #define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
252 #define RACKTIMEOUT 1 /* second */
254 static int all_rejected[NUM_PPP]; /* we rejected all peer's options */
267 abits = rbits = strtol(str, &endp, 0);
268 if (endp != str && *endp == ',') {
270 abits = strtol(str, &endp, 0);
272 if (*endp != 0 || endp == str) {
273 option_error("invalid parameter '%s' for bsdcomp option", *argv);
276 if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS))
277 || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) {
278 option_error("bsdcomp option values must be 0 or %d .. %d",
279 BSD_MIN_BITS, BSD_MAX_BITS);
283 ccp_wantoptions[0].bsd_compress = 1;
284 ccp_wantoptions[0].bsd_bits = rbits;
286 ccp_wantoptions[0].bsd_compress = 0;
288 ccp_allowoptions[0].bsd_compress = 1;
289 ccp_allowoptions[0].bsd_bits = abits;
291 ccp_allowoptions[0].bsd_compress = 0;
292 slprintf(bsd_value, sizeof(bsd_value),
293 rbits == abits? "%d": "%d,%d", rbits, abits);
306 abits = rbits = strtol(str, &endp, 0);
307 if (endp != str && *endp == ',') {
309 abits = strtol(str, &endp, 0);
311 if (*endp != 0 || endp == str) {
312 option_error("invalid parameter '%s' for deflate option", *argv);
315 if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE))
316 || (abits != 0 && (abits < DEFLATE_MIN_SIZE
317 || abits > DEFLATE_MAX_SIZE))) {
318 option_error("deflate option values must be 0 or %d .. %d",
319 DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE);
322 if (rbits == DEFLATE_MIN_SIZE || abits == DEFLATE_MIN_SIZE) {
323 if (rbits == DEFLATE_MIN_SIZE)
324 rbits = DEFLATE_MIN_WORKS;
325 if (abits == DEFLATE_MIN_SIZE)
326 abits = DEFLATE_MIN_WORKS;
327 warn("deflate option value of %d changed to %d to avoid zlib bug",
328 DEFLATE_MIN_SIZE, DEFLATE_MIN_WORKS);
331 ccp_wantoptions[0].deflate = 1;
332 ccp_wantoptions[0].deflate_size = rbits;
334 ccp_wantoptions[0].deflate = 0;
336 ccp_allowoptions[0].deflate = 1;
337 ccp_allowoptions[0].deflate_size = abits;
339 ccp_allowoptions[0].deflate = 0;
340 slprintf(deflate_value, sizeof(deflate_value),
341 rbits == abits? "%d": "%d,%d", rbits, abits);
347 * 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.
389 fsm *f = &ccp_fsm[unit];
391 if (f->state != OPENED)
392 ccp_flags_set(unit, 1, 0);
395 * Find out which compressors the kernel supports before
396 * deciding whether to open in silent mode.
399 if (!ANY_COMPRESS(ccp_gotoptions[unit]))
400 f->flags |= OPT_SILENT;
406 * ccp_close - Terminate CCP.
409 ccp_close(unit, reason)
413 ccp_flags_set(unit, 0, 0);
414 fsm_close(&ccp_fsm[unit], reason);
418 * ccp_lowerup - we may now transmit CCP packets.
424 fsm_lowerup(&ccp_fsm[unit]);
428 * ccp_lowerdown - we may not transmit CCP packets.
434 fsm_lowerdown(&ccp_fsm[unit]);
438 * ccp_input - process a received CCP packet.
441 ccp_input(unit, p, len)
446 fsm *f = &ccp_fsm[unit];
450 * Check for a terminate-request so we can print a message.
453 fsm_input(f, p, len);
454 if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED) {
455 notice("Compression disabled by peer.");
457 if (ccp_gotoptions[unit].mppe) {
458 error("MPPE disabled, closing LCP");
459 lcp_close(unit, "MPPE disabled by peer");
465 * If we get a terminate-ack and we're not asking for compression,
468 if (oldstate == REQSENT && p[0] == TERMACK
469 && !ANY_COMPRESS(ccp_gotoptions[unit]))
470 ccp_close(unit, "No compression negotiated");
474 * Handle a CCP-specific code.
477 ccp_extcode(f, code, id, p, len)
485 if (f->state != OPENED)
487 /* send a reset-ack, which the transmitter will see and
488 reset its compression state. */
489 fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
493 if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) {
494 ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT);
495 UNTIMEOUT(ccp_rack_timeout, f);
507 * ccp_protrej - peer doesn't talk CCP.
513 ccp_flags_set(unit, 0, 0);
514 fsm_lowerdown(&ccp_fsm[unit]);
517 if (ccp_gotoptions[unit].mppe) {
518 error("MPPE required but peer negotiation failed");
519 lcp_close(unit, "MPPE required but peer negotiation failed");
526 * ccp_resetci - initialize at start of negotiation.
532 ccp_options *go = &ccp_gotoptions[f->unit];
533 u_char opt_buf[CCP_MAX_OPTION_LENGTH];
535 *go = ccp_wantoptions[f->unit];
536 all_rejected[f->unit] = 0;
540 ccp_options *ao = &ccp_allowoptions[f->unit];
541 int auth_mschap_bits = auth_done[f->unit];
543 int auth_eap_bits = auth_done[f->unit];
548 * Start with a basic sanity check: mschap[v2] auth must be in
549 * exactly one direction. RFC 3079 says that the keys are
550 * 'derived from the credentials of the peer that initiated the call',
551 * however the PPP protocol doesn't have such a concept, and pppd
552 * cannot get this info externally. Instead we do the best we can.
553 * NB: If MPPE is required, all other compression opts are invalid.
554 * So, we return right away if we can't do it.
557 /* Leave only the mschap auth bits set */
558 auth_mschap_bits &= (CHAP_MS_WITHPEER | CHAP_MS_PEER |
559 CHAP_MS2_WITHPEER | CHAP_MS2_PEER);
560 /* Count the mschap auths */
561 auth_mschap_bits >>= CHAP_MS_SHIFT;
564 numbits += auth_mschap_bits & 1;
565 auth_mschap_bits >>= 1;
566 } while (auth_mschap_bits);
568 error("MPPE required, but auth done in both directions.");
569 lcp_close(f->unit, "MPPE required but not available");
575 * MPPE is also possible in combination with EAP-TLS.
576 * It is not possible to detect if we're doing EAP or EAP-TLS
577 * at this stage, hence we accept all forms of EAP. If TLS is
578 * not used then the MPPE keys will not be derived anyway.
580 /* Leave only the eap auth bits set */
581 auth_eap_bits &= (EAP_WITHPEER | EAP_PEER );
583 if ((numbits == 0) && (auth_eap_bits == 0)) {
584 error("MPPE required, but MS-CHAP[v2] nor EAP-TLS auth are performed.");
587 error("MPPE required, but MS-CHAP[v2] auth not performed.");
589 lcp_close(f->unit, "MPPE required but not available");
593 /* A plugin (eg radius) may not have obtained key material. */
594 if (!mppe_keys_set) {
595 error("MPPE required, but keys are not available. "
596 "Possible plugin problem?");
597 lcp_close(f->unit, "MPPE required but not available");
601 /* LM auth not supported for MPPE */
602 if (auth_done[f->unit] & (CHAP_MS_WITHPEER | CHAP_MS_PEER)) {
603 /* This might be noise */
604 if (go->mppe & MPPE_OPT_40) {
605 notice("Disabling 40-bit MPPE; MS-CHAP LM not supported");
606 go->mppe &= ~MPPE_OPT_40;
607 ccp_wantoptions[f->unit].mppe &= ~MPPE_OPT_40;
611 /* Last check: can we actually negotiate something? */
612 if (!(go->mppe & (MPPE_OPT_40 | MPPE_OPT_128))) {
613 /* Could be misconfig, could be 40-bit disabled above. */
614 error("MPPE required, but both 40-bit and 128-bit disabled.");
615 lcp_close(f->unit, "MPPE required but not available");
621 /* MPPE is not compatible with other compression types */
622 ao->bsd_compress = go->bsd_compress = 0;
623 ao->predictor_1 = go->predictor_1 = 0;
624 ao->predictor_2 = go->predictor_2 = 0;
625 ao->deflate = go->deflate = 0;
630 * Check whether the kernel knows about the various
631 * compression methods we might request.
635 opt_buf[0] = CI_MPPE;
636 opt_buf[1] = CILEN_MPPE;
637 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
638 /* Key material unimportant here. */
639 if (ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0) <= 0) {
640 error("MPPE required, but kernel has no support.");
641 lcp_close(f->unit, "MPPE required but not available");
645 if (go->bsd_compress) {
646 opt_buf[0] = CI_BSD_COMPRESS;
647 opt_buf[1] = CILEN_BSD_COMPRESS;
648 opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS);
649 if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0)
650 go->bsd_compress = 0;
653 if (go->deflate_correct) {
654 opt_buf[0] = CI_DEFLATE;
655 opt_buf[1] = CILEN_DEFLATE;
656 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
657 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
658 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
659 go->deflate_correct = 0;
661 if (go->deflate_draft) {
662 opt_buf[0] = CI_DEFLATE_DRAFT;
663 opt_buf[1] = CILEN_DEFLATE;
664 opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
665 opt_buf[3] = DEFLATE_CHK_SEQUENCE;
666 if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
667 go->deflate_draft = 0;
669 if (!go->deflate_correct && !go->deflate_draft)
672 if (go->predictor_1) {
673 opt_buf[0] = CI_PREDICTOR_1;
674 opt_buf[1] = CILEN_PREDICTOR_1;
675 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
678 if (go->predictor_2) {
679 opt_buf[0] = CI_PREDICTOR_2;
680 opt_buf[1] = CILEN_PREDICTOR_2;
681 if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
687 * ccp_cilen - Return total length of our configuration info.
693 ccp_options *go = &ccp_gotoptions[f->unit];
695 return (go->bsd_compress? CILEN_BSD_COMPRESS: 0)
696 + (go->deflate && go->deflate_correct? CILEN_DEFLATE: 0)
697 + (go->deflate && go->deflate_draft? CILEN_DEFLATE: 0)
698 + (go->predictor_1? CILEN_PREDICTOR_1: 0)
699 + (go->predictor_2? CILEN_PREDICTOR_2: 0)
700 + (go->mppe? CILEN_MPPE: 0);
704 * ccp_addci - put our requests in a packet.
707 ccp_addci(f, p, lenp)
713 ccp_options *go = &ccp_gotoptions[f->unit];
717 * Add the compression types that we can receive, in decreasing
718 * preference order. Get the kernel to allocate the first one
719 * in case it gets Acked.
723 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
725 p[0] = opt_buf[0] = CI_MPPE;
726 p[1] = opt_buf[1] = CILEN_MPPE;
727 MPPE_OPTS_TO_CI(go->mppe, &p[2]);
728 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
729 BCOPY(mppe_recv_key, &opt_buf[CILEN_MPPE], MPPE_MAX_KEY_LEN);
730 res = ccp_test(f->unit, opt_buf, CILEN_MPPE + MPPE_MAX_KEY_LEN, 0);
734 /* This shouldn't happen, we've already tested it! */
735 lcp_close(f->unit, "MPPE required but not available in kernel");
739 p[0] = go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT;
740 p[1] = CILEN_DEFLATE;
741 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
742 p[3] = DEFLATE_CHK_SEQUENCE;
747 if (go->deflate_size < DEFLATE_MIN_WORKS) {
751 res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
755 } else if (res < 0) {
760 p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
763 if (p != p0 && go->deflate_correct && go->deflate_draft) {
764 p[0] = CI_DEFLATE_DRAFT;
765 p[1] = CILEN_DEFLATE;
766 p[2] = p[2 - CILEN_DEFLATE];
767 p[3] = DEFLATE_CHK_SEQUENCE;
771 if (go->bsd_compress) {
772 p[0] = CI_BSD_COMPRESS;
773 p[1] = CILEN_BSD_COMPRESS;
774 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
776 p += CILEN_BSD_COMPRESS; /* not the first option */
779 if (go->bsd_bits < BSD_MIN_BITS) {
780 go->bsd_compress = 0;
783 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0);
785 p += CILEN_BSD_COMPRESS;
787 } else if (res < 0) {
788 go->bsd_compress = 0;
792 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
796 /* XXX Should Predictor 2 be preferable to Predictor 1? */
797 if (go->predictor_1) {
798 p[0] = CI_PREDICTOR_1;
799 p[1] = CILEN_PREDICTOR_1;
800 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) {
803 p += CILEN_PREDICTOR_1;
806 if (go->predictor_2) {
807 p[0] = CI_PREDICTOR_2;
808 p[1] = CILEN_PREDICTOR_2;
809 if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) {
812 p += CILEN_PREDICTOR_2;
816 go->method = (p > p0)? p0[0]: -1;
822 * ccp_ackci - process a received configure-ack, and return
823 * 1 iff the packet was OK.
831 ccp_options *go = &ccp_gotoptions[f->unit];
836 u_char opt_buf[CILEN_MPPE];
838 opt_buf[0] = CI_MPPE;
839 opt_buf[1] = CILEN_MPPE;
840 MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]);
841 if (len < CILEN_MPPE || memcmp(opt_buf, p, CILEN_MPPE))
845 /* XXX Cope with first/fast ack */
851 if (len < CILEN_DEFLATE
852 || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
853 || p[1] != CILEN_DEFLATE
854 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
855 || p[3] != DEFLATE_CHK_SEQUENCE)
858 len -= CILEN_DEFLATE;
859 /* XXX Cope with first/fast ack */
862 if (go->deflate_correct && go->deflate_draft) {
863 if (len < CILEN_DEFLATE
864 || p[0] != CI_DEFLATE_DRAFT
865 || p[1] != CILEN_DEFLATE
866 || p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
867 || p[3] != DEFLATE_CHK_SEQUENCE)
870 len -= CILEN_DEFLATE;
873 if (go->bsd_compress) {
874 if (len < CILEN_BSD_COMPRESS
875 || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
876 || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
878 p += CILEN_BSD_COMPRESS;
879 len -= CILEN_BSD_COMPRESS;
880 /* XXX Cope with first/fast ack */
881 if (p == p0 && len == 0)
884 if (go->predictor_1) {
885 if (len < CILEN_PREDICTOR_1
886 || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
888 p += CILEN_PREDICTOR_1;
889 len -= CILEN_PREDICTOR_1;
890 /* XXX Cope with first/fast ack */
891 if (p == p0 && len == 0)
894 if (go->predictor_2) {
895 if (len < CILEN_PREDICTOR_2
896 || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
898 p += CILEN_PREDICTOR_2;
899 len -= CILEN_PREDICTOR_2;
900 /* XXX Cope with first/fast ack */
901 if (p == p0 && len == 0)
911 * ccp_nakci - process received configure-nak.
912 * Returns 1 iff the nak was OK.
915 ccp_nakci(f, p, len, treat_as_reject)
921 ccp_options *go = &ccp_gotoptions[f->unit];
922 ccp_options no; /* options we've seen already */
923 ccp_options try; /* options to ask for next time */
925 memset(&no, 0, sizeof(no));
929 if (go->mppe && len >= CILEN_MPPE
930 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
933 * Peer wants us to use a different strength or other setting.
934 * Fail if we aren't willing to use his suggestion.
936 MPPE_CI_TO_OPTS(&p[2], try.mppe);
937 if ((try.mppe & MPPE_OPT_STATEFUL) && refuse_mppe_stateful) {
938 error("Refusing MPPE stateful mode offered by peer");
940 } else if (((go->mppe | MPPE_OPT_STATEFUL) & try.mppe) != try.mppe) {
941 /* Peer must have set options we didn't request (suggest) */
946 error("MPPE required but peer negotiation failed");
947 lcp_close(f->unit, "MPPE required but peer negotiation failed");
951 if (go->deflate && len >= CILEN_DEFLATE
952 && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
953 && p[1] == CILEN_DEFLATE) {
956 * Peer wants us to use a different code size or something.
957 * Stop asking for Deflate if we don't understand his suggestion.
959 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
960 || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_WORKS
961 || p[3] != DEFLATE_CHK_SEQUENCE)
963 else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
964 try.deflate_size = DEFLATE_SIZE(p[2]);
966 len -= CILEN_DEFLATE;
967 if (go->deflate_correct && go->deflate_draft
968 && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
969 && p[1] == CILEN_DEFLATE) {
971 len -= CILEN_DEFLATE;
975 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
976 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
979 * Peer wants us to use a different number of bits
980 * or a different version.
982 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
983 try.bsd_compress = 0;
984 else if (BSD_NBITS(p[2]) < go->bsd_bits)
985 try.bsd_bits = BSD_NBITS(p[2]);
986 p += CILEN_BSD_COMPRESS;
987 len -= CILEN_BSD_COMPRESS;
991 * Predictor-1 and 2 have no options, so they can't be Naked.
993 * There may be remaining options but we ignore them.
996 if (f->state != OPENED)
1002 * ccp_rejci - reject some of our suggested compression methods.
1005 ccp_rejci(f, p, len)
1010 ccp_options *go = &ccp_gotoptions[f->unit];
1011 ccp_options try; /* options to request next time */
1016 * Cope with empty configure-rejects by ceasing to send
1017 * configure-requests.
1019 if (len == 0 && all_rejected[f->unit])
1023 if (go->mppe && len >= CILEN_MPPE
1024 && p[0] == CI_MPPE && p[1] == CILEN_MPPE) {
1025 error("MPPE required but peer refused");
1026 lcp_close(f->unit, "MPPE required but peer refused");
1031 if (go->deflate_correct && len >= CILEN_DEFLATE
1032 && p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) {
1033 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1034 || p[3] != DEFLATE_CHK_SEQUENCE)
1035 return 0; /* Rej is bad */
1036 try.deflate_correct = 0;
1038 len -= CILEN_DEFLATE;
1040 if (go->deflate_draft && len >= CILEN_DEFLATE
1041 && p[0] == CI_DEFLATE_DRAFT && p[1] == CILEN_DEFLATE) {
1042 if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
1043 || p[3] != DEFLATE_CHK_SEQUENCE)
1044 return 0; /* Rej is bad */
1045 try.deflate_draft = 0;
1047 len -= CILEN_DEFLATE;
1049 if (!try.deflate_correct && !try.deflate_draft)
1051 if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
1052 && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
1053 if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
1055 try.bsd_compress = 0;
1056 p += CILEN_BSD_COMPRESS;
1057 len -= CILEN_BSD_COMPRESS;
1059 if (go->predictor_1 && len >= CILEN_PREDICTOR_1
1060 && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
1061 try.predictor_1 = 0;
1062 p += CILEN_PREDICTOR_1;
1063 len -= CILEN_PREDICTOR_1;
1065 if (go->predictor_2 && len >= CILEN_PREDICTOR_2
1066 && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
1067 try.predictor_2 = 0;
1068 p += CILEN_PREDICTOR_2;
1069 len -= CILEN_PREDICTOR_2;
1075 if (f->state != OPENED)
1082 * ccp_reqci - processed a received configure-request.
1083 * Returns CONFACK, CONFNAK or CONFREJ and the packet modified
1087 ccp_reqci(f, p, lenp, dont_nak)
1093 int ret, newret, res;
1095 int len, clen, type, nb;
1096 ccp_options *ho = &ccp_hisoptions[f->unit];
1097 ccp_options *ao = &ccp_allowoptions[f->unit];
1099 bool rej_for_ci_mppe = 1; /* Are we rejecting based on a bad/missing */
1100 /* CI_MPPE, or due to other options? */
1107 memset(ho, 0, sizeof(ccp_options));
1108 ho->method = (len > 0)? p[0]: -1;
1112 if (len < 2 || p[1] < 2 || p[1] > len) {
1124 if (!ao->mppe || clen != CILEN_MPPE) {
1128 MPPE_CI_TO_OPTS(&p[2], ho->mppe);
1130 /* Nak if anything unsupported or unknown are set. */
1131 if (ho->mppe & MPPE_OPT_UNSUPPORTED) {
1133 ho->mppe &= ~MPPE_OPT_UNSUPPORTED;
1135 if (ho->mppe & MPPE_OPT_UNKNOWN) {
1137 ho->mppe &= ~MPPE_OPT_UNKNOWN;
1140 /* Check state opt */
1141 if (ho->mppe & MPPE_OPT_STATEFUL) {
1143 * We can Nak and request stateless, but it's a
1144 * lot easier to just assume the peer will request
1145 * it if he can do it; stateful mode is bad over
1146 * the Internet -- which is where we expect MPPE.
1148 if (refuse_mppe_stateful) {
1149 error("Refusing MPPE stateful mode offered by peer");
1155 /* Find out which of {S,L} are set. */
1156 if ((ho->mppe & MPPE_OPT_128)
1157 && (ho->mppe & MPPE_OPT_40)) {
1158 /* Both are set, negotiate the strongest. */
1160 if (ao->mppe & MPPE_OPT_128)
1161 ho->mppe &= ~MPPE_OPT_40;
1162 else if (ao->mppe & MPPE_OPT_40)
1163 ho->mppe &= ~MPPE_OPT_128;
1168 } else if (ho->mppe & MPPE_OPT_128) {
1169 if (!(ao->mppe & MPPE_OPT_128)) {
1173 } else if (ho->mppe & MPPE_OPT_40) {
1174 if (!(ao->mppe & MPPE_OPT_40)) {
1179 /* Neither are set. */
1180 /* We cannot accept this. */
1182 /* Give the peer our idea of what can be used,
1183 so it can choose and confirm */
1184 ho->mppe = ao->mppe;
1187 /* rebuild the opts */
1188 MPPE_OPTS_TO_CI(ho->mppe, &p[2]);
1189 if (newret == CONFACK) {
1190 u_char opt_buf[CILEN_MPPE + MPPE_MAX_KEY_LEN];
1193 BCOPY(p, opt_buf, CILEN_MPPE);
1194 BCOPY(mppe_send_key, &opt_buf[CILEN_MPPE],
1196 if (ccp_test(f->unit, opt_buf,
1197 CILEN_MPPE + MPPE_MAX_KEY_LEN, 1) <= 0) {
1198 /* This shouldn't happen, we've already tested it! */
1199 error("MPPE required, but kernel has no support.");
1200 lcp_close(f->unit, "MPPE required but not available");
1205 * We need to decrease the interface MTU by MPPE_PAD
1206 * because MPPE frames **grow**. The kernel [must]
1207 * allocate MPPE_PAD extra bytes in xmit buffers.
1209 mtu = netif_get_mtu(f->unit);
1211 netif_set_mtu(f->unit, mtu - MPPE_PAD);
1217 * We have accepted MPPE or are willing to negotiate
1218 * MPPE parameters. A CONFREJ is due to subsequent
1219 * (non-MPPE) processing.
1221 rej_for_ci_mppe = 0;
1225 case CI_DEFLATE_DRAFT:
1226 if (!ao->deflate || clen != CILEN_DEFLATE
1227 || (!ao->deflate_correct && type == CI_DEFLATE)
1228 || (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) {
1234 ho->deflate_size = nb = DEFLATE_SIZE(p[2]);
1235 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
1236 || p[3] != DEFLATE_CHK_SEQUENCE
1237 || nb > ao->deflate_size || nb < DEFLATE_MIN_WORKS) {
1240 p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
1241 p[3] = DEFLATE_CHK_SEQUENCE;
1242 /* fall through to test this #bits below */
1248 * Check whether we can do Deflate with the window
1249 * size they want. If the window is too big, reduce
1250 * it until the kernel can cope and nak with that.
1251 * We only check this for the first option.
1255 res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
1257 break; /* it's OK now */
1258 if (res < 0 || nb == DEFLATE_MIN_WORKS || dont_nak) {
1260 p[2] = DEFLATE_MAKE_OPT(ho->deflate_size);
1265 p[2] = DEFLATE_MAKE_OPT(nb);
1270 case CI_BSD_COMPRESS:
1271 if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) {
1276 ho->bsd_compress = 1;
1277 ho->bsd_bits = nb = BSD_NBITS(p[2]);
1278 if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
1279 || nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
1282 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
1283 /* fall through to test this #bits below */
1289 * Check whether we can do BSD-Compress with the code
1290 * size they want. If the code size is too big, reduce
1291 * it until the kernel can cope and nak with that.
1292 * We only check this for the first option.
1296 res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1);
1299 if (res < 0 || nb == BSD_MIN_BITS || dont_nak) {
1301 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION,
1307 p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
1312 case CI_PREDICTOR_1:
1313 if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) {
1318 ho->predictor_1 = 1;
1320 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
1325 case CI_PREDICTOR_2:
1326 if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) {
1331 ho->predictor_2 = 1;
1333 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
1343 if (newret == CONFNAK && dont_nak)
1345 if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) {
1346 /* we're returning this option */
1347 if (newret == CONFREJ && ret == CONFNAK)
1351 BCOPY(p, retp, clen);
1359 if (ret != CONFACK) {
1360 if (ret == CONFREJ && *lenp == retp - p0)
1361 all_rejected[f->unit] = 1;
1366 if (ret == CONFREJ && ao->mppe && rej_for_ci_mppe) {
1367 error("MPPE required but peer negotiation failed");
1368 lcp_close(f->unit, "MPPE required but peer negotiation failed");
1375 * Make a string name for a compression method (or 2).
1378 method_name(opt, opt2)
1379 ccp_options *opt, *opt2;
1381 static char result[64];
1383 if (!ANY_COMPRESS(*opt))
1385 switch (opt->method) {
1390 char *q = result + sizeof(result); /* 1 past result */
1392 slprintf(p, q - p, "MPPE ");
1394 if (opt->mppe & MPPE_OPT_128) {
1395 slprintf(p, q - p, "128-bit ");
1398 if (opt->mppe & MPPE_OPT_40) {
1399 slprintf(p, q - p, "40-bit ");
1402 if (opt->mppe & MPPE_OPT_STATEFUL)
1403 slprintf(p, q - p, "stateful");
1405 slprintf(p, q - p, "stateless");
1411 case CI_DEFLATE_DRAFT:
1412 if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
1413 slprintf(result, sizeof(result), "Deflate%s (%d/%d)",
1414 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1415 opt->deflate_size, opt2->deflate_size);
1417 slprintf(result, sizeof(result), "Deflate%s (%d)",
1418 (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1421 case CI_BSD_COMPRESS:
1422 if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
1423 slprintf(result, sizeof(result), "BSD-Compress (%d/%d)",
1424 opt->bsd_bits, opt2->bsd_bits);
1426 slprintf(result, sizeof(result), "BSD-Compress (%d)",
1429 case CI_PREDICTOR_1:
1430 return "Predictor 1";
1431 case CI_PREDICTOR_2:
1432 return "Predictor 2";
1434 slprintf(result, sizeof(result), "Method %d", opt->method);
1440 * CCP has come up - inform the kernel driver and log a message.
1446 ccp_options *go = &ccp_gotoptions[f->unit];
1447 ccp_options *ho = &ccp_hisoptions[f->unit];
1450 ccp_flags_set(f->unit, 1, 1);
1451 if (ANY_COMPRESS(*go)) {
1452 if (ANY_COMPRESS(*ho)) {
1453 if (go->method == ho->method) {
1454 notice("%s compression enabled", method_name(go, ho));
1456 strlcpy(method1, method_name(go, NULL), sizeof(method1));
1457 notice("%s / %s compression enabled",
1458 method1, method_name(ho, NULL));
1461 notice("%s receive compression enabled", method_name(go, NULL));
1462 } else if (ANY_COMPRESS(*ho))
1463 notice("%s transmit compression enabled", method_name(ho, NULL));
1466 BZERO(mppe_recv_key, MPPE_MAX_KEY_LEN);
1467 BZERO(mppe_send_key, MPPE_MAX_KEY_LEN);
1468 continue_networks(f->unit); /* Bring up IP et al */
1474 * CCP has gone down - inform the kernel driver.
1480 if (ccp_localstate[f->unit] & RACK_PENDING)
1481 UNTIMEOUT(ccp_rack_timeout, f);
1482 ccp_localstate[f->unit] = 0;
1483 ccp_flags_set(f->unit, 1, 0);
1485 if (ccp_gotoptions[f->unit].mppe) {
1486 ccp_gotoptions[f->unit].mppe = 0;
1487 if (lcp_fsm[f->unit].state == OPENED) {
1488 /* If LCP is not already going down, make sure it does. */
1489 error("MPPE disabled");
1490 lcp_close(f->unit, "MPPE disabled");
1497 * Print the contents of a CCP packet.
1499 static char *ccp_codenames[] = {
1500 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1501 "TermReq", "TermAck", "CodeRej",
1502 NULL, NULL, NULL, NULL, NULL, NULL,
1503 "ResetReq", "ResetAck",
1507 ccp_printpkt(p, plen, printer, arg)
1510 void (*printer) __P((void *, char *, ...));
1513 u_char *p0, *optend;
1518 if (plen < HEADERLEN)
1522 len = (p[2] << 8) + p[3];
1523 if (len < HEADERLEN || len > plen)
1526 if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *)
1527 && ccp_codenames[code-1] != NULL)
1528 printer(arg, " %s", ccp_codenames[code-1]);
1530 printer(arg, " code=0x%x", code);
1531 printer(arg, " id=0x%x", id);
1540 /* print list of possible compression methods */
1544 if (optlen < 2 || optlen > len)
1548 optend = p + optlen;
1552 if (optlen >= CILEN_MPPE) {
1555 MPPE_CI_TO_OPTS(&p[2], mppe_opts);
1556 printer(arg, "mppe %s %s %s %s %s %s%s",
1557 (p[2] & MPPE_H_BIT)? "+H": "-H",
1558 (p[5] & MPPE_M_BIT)? "+M": "-M",
1559 (p[5] & MPPE_S_BIT)? "+S": "-S",
1560 (p[5] & MPPE_L_BIT)? "+L": "-L",
1561 (p[5] & MPPE_D_BIT)? "+D": "-D",
1562 (p[5] & MPPE_C_BIT)? "+C": "-C",
1563 (mppe_opts & MPPE_OPT_UNKNOWN)? " +U": "");
1564 if (mppe_opts & MPPE_OPT_UNKNOWN)
1565 printer(arg, " (%.2x %.2x %.2x %.2x)",
1566 p[2], p[3], p[4], p[5]);
1572 case CI_DEFLATE_DRAFT:
1573 if (optlen >= CILEN_DEFLATE) {
1574 printer(arg, "deflate%s %d",
1575 (code == CI_DEFLATE_DRAFT? "(old#)": ""),
1576 DEFLATE_SIZE(p[2]));
1577 if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
1578 printer(arg, " method %d", DEFLATE_METHOD(p[2]));
1579 if (p[3] != DEFLATE_CHK_SEQUENCE)
1580 printer(arg, " check %d", p[3]);
1584 case CI_BSD_COMPRESS:
1585 if (optlen >= CILEN_BSD_COMPRESS) {
1586 printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
1588 p += CILEN_BSD_COMPRESS;
1591 case CI_PREDICTOR_1:
1592 if (optlen >= CILEN_PREDICTOR_1) {
1593 printer(arg, "predictor 1");
1594 p += CILEN_PREDICTOR_1;
1597 case CI_PREDICTOR_2:
1598 if (optlen >= CILEN_PREDICTOR_2) {
1599 printer(arg, "predictor 2");
1600 p += CILEN_PREDICTOR_2;
1605 printer(arg, " %.2x", *p++);
1612 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1613 print_string((char *)p, len, printer, arg);
1620 /* dump out the rest of the packet in hex */
1622 printer(arg, " %.2x", *p++);
1628 * We have received a packet that the decompressor failed to
1629 * decompress. Here we would expect to issue a reset-request, but
1630 * Motorola has a patent on resetting the compressor as a result of
1631 * detecting an error in the decompressed data after decompression.
1632 * (See US patent 5,130,993; international patent publication number
1633 * WO 91/10289; Australian patent 73296/91.)
1635 * So we ask the kernel whether the error was detected after
1636 * decompression; if it was, we take CCP down, thus disabling
1637 * compression :-(, otherwise we issue the reset-request.
1640 ccp_datainput(unit, pkt, len)
1648 if (f->state == OPENED) {
1649 if (ccp_fatal_error(unit)) {
1651 * Disable compression by taking CCP down.
1653 error("Lost compression sync: disabling compression");
1654 ccp_close(unit, "Lost compression sync");
1657 * If we were doing MPPE, we must also take the link down.
1659 if (ccp_gotoptions[unit].mppe) {
1660 error("Too many MPPE errors, closing LCP");
1661 lcp_close(unit, "Too many MPPE errors");
1666 * Send a reset-request to reset the peer's compressor.
1667 * We don't do that if we are still waiting for an
1668 * acknowledgement to a previous reset-request.
1670 if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
1671 fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
1672 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1673 ccp_localstate[f->unit] |= RACK_PENDING;
1675 ccp_localstate[f->unit] |= RREQ_REPEAT;
1681 * Timeout waiting for reset-ack.
1684 ccp_rack_timeout(arg)
1689 if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
1690 fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
1691 TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1692 ccp_localstate[f->unit] &= ~RREQ_REPEAT;
1694 ccp_localstate[f->unit] &= ~RACK_PENDING;