2
* ccp.c - PPP Compression Control Protocol.
4
* Copyright (c) 1994 The Australian National University.
7
* Permission to use, copy, modify, and distribute this software and its
8
* documentation is hereby granted, provided that the above copyright
9
* notice appears in all copies. This software is provided without any
10
* warranty, express or implied. The Australian National University
11
* makes no representations about the suitability of this software for
14
* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
15
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
17
* THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
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* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
22
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
23
* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
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* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
28
#define RCSID "$Id: ccp.c,v 1.32 2001/03/08 05:11:11 paulus Exp $"
36
#include <net/ppp-comp.h>
38
static const char rcsid[] = RCSID;
41
* Unfortunately there is a bug in zlib which means that using a
42
* size of 8 (window size = 256) for Deflate compression will cause
43
* buffer overruns and kernel crashes in the deflate module.
44
* Until this is fixed we only accept sizes in the range 9 .. 15.
45
* Thanks to James Carlson for pointing this out.
47
#define DEFLATE_MIN_WORKS 9
50
* Command-line options.
52
static int setbsdcomp __P((char **));
53
static int setdeflate __P((char **));
54
static char bsd_value[8];
55
static char deflate_value[8];
57
static option_t ccp_option_list[] = {
58
{ "noccp", o_bool, &ccp_protent.enabled_flag,
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"Disable CCP negotiation" },
60
{ "-ccp", o_bool, &ccp_protent.enabled_flag,
61
"Disable CCP negotiation", OPT_ALIAS },
63
{ "bsdcomp", o_special, (void *)setbsdcomp,
64
"Request BSD-Compress packet compression",
65
OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value },
66
{ "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
67
"don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR,
68
&ccp_allowoptions[0].bsd_compress },
69
{ "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress,
70
"don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
71
&ccp_allowoptions[0].bsd_compress },
73
{ "deflate", o_special, (void *)setdeflate,
74
"request Deflate compression",
75
OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value },
76
{ "nodeflate", o_bool, &ccp_wantoptions[0].deflate,
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"don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR,
78
&ccp_allowoptions[0].deflate },
79
{ "-deflate", o_bool, &ccp_wantoptions[0].deflate,
80
"don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
81
&ccp_allowoptions[0].deflate },
83
{ "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft,
84
"don't use draft deflate #", OPT_A2COPY,
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&ccp_allowoptions[0].deflate_draft },
87
{ "predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
88
"request Predictor-1", 1, &ccp_allowoptions[0].predictor_1, OPT_PRIO },
89
{ "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1,
90
"don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR,
91
&ccp_allowoptions[0].predictor_1 },
92
{ "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1,
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"don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR,
94
&ccp_allowoptions[0].predictor_1 },
100
* Protocol entry points from main code.
102
static void ccp_init __P((int unit));
103
static void ccp_open __P((int unit));
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static void ccp_close __P((int unit, char *));
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static void ccp_lowerup __P((int unit));
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static void ccp_lowerdown __P((int));
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static void ccp_input __P((int unit, u_char *pkt, int len));
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static void ccp_protrej __P((int unit));
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static int ccp_printpkt __P((u_char *pkt, int len,
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void (*printer) __P((void *, char *, ...)),
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static void ccp_datainput __P((int unit, u_char *pkt, int len));
114
struct protent ccp_protent = {
134
fsm ccp_fsm[NUM_PPP];
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ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */
136
ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */
137
ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */
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ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */
141
* Callbacks for fsm code.
143
static void ccp_resetci __P((fsm *));
144
static int ccp_cilen __P((fsm *));
145
static void ccp_addci __P((fsm *, u_char *, int *));
146
static int ccp_ackci __P((fsm *, u_char *, int));
147
static int ccp_nakci __P((fsm *, u_char *, int));
148
static int ccp_rejci __P((fsm *, u_char *, int));
149
static int ccp_reqci __P((fsm *, u_char *, int *, int));
150
static void ccp_up __P((fsm *));
151
static void ccp_down __P((fsm *));
152
static int ccp_extcode __P((fsm *, int, int, u_char *, int));
153
static void ccp_rack_timeout __P((void *));
154
static char *method_name __P((ccp_options *, ccp_options *));
156
static fsm_callbacks ccp_callbacks = {
175
* Do we want / did we get any compression?
177
#define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \
178
|| (opt).predictor_1 || (opt).predictor_2)
181
* Local state (mainly for handling reset-reqs and reset-acks).
183
static int ccp_localstate[NUM_PPP];
184
#define RACK_PENDING 1 /* waiting for reset-ack */
185
#define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */
187
#define RACKTIMEOUT 1 /* second */
189
static int all_rejected[NUM_PPP]; /* we rejected all peer's options */
202
abits = rbits = strtol(str, &endp, 0);
203
if (endp != str && *endp == ',') {
205
abits = strtol(str, &endp, 0);
207
if (*endp != 0 || endp == str) {
208
option_error("invalid parameter '%s' for bsdcomp option", *argv);
211
if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS))
212
|| (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) {
213
option_error("bsdcomp option values must be 0 or %d .. %d",
214
BSD_MIN_BITS, BSD_MAX_BITS);
218
ccp_wantoptions[0].bsd_compress = 1;
219
ccp_wantoptions[0].bsd_bits = rbits;
221
ccp_wantoptions[0].bsd_compress = 0;
223
ccp_allowoptions[0].bsd_compress = 1;
224
ccp_allowoptions[0].bsd_bits = abits;
226
ccp_allowoptions[0].bsd_compress = 0;
227
slprintf(bsd_value, sizeof(bsd_value),
228
rbits == abits? "%d": "%d,%d", rbits, abits);
241
abits = rbits = strtol(str, &endp, 0);
242
if (endp != str && *endp == ',') {
244
abits = strtol(str, &endp, 0);
246
if (*endp != 0 || endp == str) {
247
option_error("invalid parameter '%s' for deflate option", *argv);
250
if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE))
251
|| (abits != 0 && (abits < DEFLATE_MIN_SIZE
252
|| abits > DEFLATE_MAX_SIZE))) {
253
option_error("deflate option values must be 0 or %d .. %d",
254
DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE);
257
if (rbits == DEFLATE_MIN_SIZE || abits == DEFLATE_MIN_SIZE) {
258
if (rbits == DEFLATE_MIN_SIZE)
259
rbits = DEFLATE_MIN_WORKS;
260
if (abits == DEFLATE_MIN_SIZE)
261
abits = DEFLATE_MIN_WORKS;
262
warn("deflate option value of %d changed to %d to avoid zlib bug",
263
DEFLATE_MIN_SIZE, DEFLATE_MIN_WORKS);
266
ccp_wantoptions[0].deflate = 1;
267
ccp_wantoptions[0].deflate_size = rbits;
269
ccp_wantoptions[0].deflate = 0;
271
ccp_allowoptions[0].deflate = 1;
272
ccp_allowoptions[0].deflate_size = abits;
274
ccp_allowoptions[0].deflate = 0;
275
slprintf(deflate_value, sizeof(deflate_value),
276
rbits == abits? "%d": "%d,%d", rbits, abits);
282
* ccp_init - initialize CCP.
288
fsm *f = &ccp_fsm[unit];
291
f->protocol = PPP_CCP;
292
f->callbacks = &ccp_callbacks;
295
memset(&ccp_wantoptions[unit], 0, sizeof(ccp_options));
296
memset(&ccp_gotoptions[unit], 0, sizeof(ccp_options));
297
memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options));
298
memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options));
300
ccp_wantoptions[0].deflate = 1;
301
ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE;
302
ccp_wantoptions[0].deflate_correct = 1;
303
ccp_wantoptions[0].deflate_draft = 1;
304
ccp_allowoptions[0].deflate = 1;
305
ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE;
306
ccp_allowoptions[0].deflate_correct = 1;
307
ccp_allowoptions[0].deflate_draft = 1;
309
ccp_wantoptions[0].bsd_compress = 1;
310
ccp_wantoptions[0].bsd_bits = BSD_MAX_BITS;
311
ccp_allowoptions[0].bsd_compress = 1;
312
ccp_allowoptions[0].bsd_bits = BSD_MAX_BITS;
314
ccp_allowoptions[0].predictor_1 = 1;
318
* ccp_open - CCP is allowed to come up.
324
fsm *f = &ccp_fsm[unit];
326
if (f->state != OPENED)
327
ccp_flags_set(unit, 1, 0);
330
* Find out which compressors the kernel supports before
331
* deciding whether to open in silent mode.
334
if (!ANY_COMPRESS(ccp_gotoptions[unit]))
335
f->flags |= OPT_SILENT;
341
* ccp_close - Terminate CCP.
344
ccp_close(unit, reason)
348
ccp_flags_set(unit, 0, 0);
349
fsm_close(&ccp_fsm[unit], reason);
353
* ccp_lowerup - we may now transmit CCP packets.
359
fsm_lowerup(&ccp_fsm[unit]);
363
* ccp_lowerdown - we may not transmit CCP packets.
369
fsm_lowerdown(&ccp_fsm[unit]);
373
* ccp_input - process a received CCP packet.
376
ccp_input(unit, p, len)
381
fsm *f = &ccp_fsm[unit];
385
* Check for a terminate-request so we can print a message.
388
fsm_input(f, p, len);
389
if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED)
390
notice("Compression disabled by peer.");
393
* If we get a terminate-ack and we're not asking for compression,
396
if (oldstate == REQSENT && p[0] == TERMACK
397
&& !ANY_COMPRESS(ccp_gotoptions[unit]))
398
ccp_close(unit, "No compression negotiated");
402
* Handle a CCP-specific code.
405
ccp_extcode(f, code, id, p, len)
413
if (f->state != OPENED)
415
/* send a reset-ack, which the transmitter will see and
416
reset its compression state. */
417
fsm_sdata(f, CCP_RESETACK, id, NULL, 0);
421
if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) {
422
ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT);
423
UNTIMEOUT(ccp_rack_timeout, f);
435
* ccp_protrej - peer doesn't talk CCP.
441
ccp_flags_set(unit, 0, 0);
442
fsm_lowerdown(&ccp_fsm[unit]);
446
* ccp_resetci - initialize at start of negotiation.
452
ccp_options *go = &ccp_gotoptions[f->unit];
455
*go = ccp_wantoptions[f->unit];
456
all_rejected[f->unit] = 0;
459
* Check whether the kernel knows about the various
460
* compression methods we might request.
462
if (go->bsd_compress) {
463
opt_buf[0] = CI_BSD_COMPRESS;
464
opt_buf[1] = CILEN_BSD_COMPRESS;
465
opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS);
466
if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0)
467
go->bsd_compress = 0;
470
if (go->deflate_correct) {
471
opt_buf[0] = CI_DEFLATE;
472
opt_buf[1] = CILEN_DEFLATE;
473
opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
474
opt_buf[3] = DEFLATE_CHK_SEQUENCE;
475
if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
476
go->deflate_correct = 0;
478
if (go->deflate_draft) {
479
opt_buf[0] = CI_DEFLATE_DRAFT;
480
opt_buf[1] = CILEN_DEFLATE;
481
opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_WORKS);
482
opt_buf[3] = DEFLATE_CHK_SEQUENCE;
483
if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0)
484
go->deflate_draft = 0;
486
if (!go->deflate_correct && !go->deflate_draft)
489
if (go->predictor_1) {
490
opt_buf[0] = CI_PREDICTOR_1;
491
opt_buf[1] = CILEN_PREDICTOR_1;
492
if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0)
495
if (go->predictor_2) {
496
opt_buf[0] = CI_PREDICTOR_2;
497
opt_buf[1] = CILEN_PREDICTOR_2;
498
if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0)
504
* ccp_cilen - Return total length of our configuration info.
510
ccp_options *go = &ccp_gotoptions[f->unit];
512
return (go->bsd_compress? CILEN_BSD_COMPRESS: 0)
513
+ (go->deflate? CILEN_DEFLATE: 0)
514
+ (go->predictor_1? CILEN_PREDICTOR_1: 0)
515
+ (go->predictor_2? CILEN_PREDICTOR_2: 0);
519
* ccp_addci - put our requests in a packet.
522
ccp_addci(f, p, lenp)
528
ccp_options *go = &ccp_gotoptions[f->unit];
532
* Add the compression types that we can receive, in decreasing
533
* preference order. Get the kernel to allocate the first one
534
* in case it gets Acked.
537
p[0] = go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT;
538
p[1] = CILEN_DEFLATE;
539
p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
540
p[3] = DEFLATE_CHK_SEQUENCE;
542
res = ccp_test(f->unit, p, CILEN_DEFLATE, 0);
547
if (res < 0 || go->deflate_size <= DEFLATE_MIN_WORKS) {
552
p[2] = DEFLATE_MAKE_OPT(go->deflate_size);
554
if (p != p0 && go->deflate_correct && go->deflate_draft) {
555
p[0] = CI_DEFLATE_DRAFT;
556
p[1] = CILEN_DEFLATE;
557
p[2] = p[2 - CILEN_DEFLATE];
558
p[3] = DEFLATE_CHK_SEQUENCE;
562
if (go->bsd_compress) {
563
p[0] = CI_BSD_COMPRESS;
564
p[1] = CILEN_BSD_COMPRESS;
565
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
567
p += CILEN_BSD_COMPRESS; /* not the first option */
570
res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0);
572
p += CILEN_BSD_COMPRESS;
575
if (res < 0 || go->bsd_bits <= BSD_MIN_BITS) {
576
go->bsd_compress = 0;
580
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits);
584
/* XXX Should Predictor 2 be preferable to Predictor 1? */
585
if (go->predictor_1) {
586
p[0] = CI_PREDICTOR_1;
587
p[1] = CILEN_PREDICTOR_1;
588
if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) {
591
p += CILEN_PREDICTOR_1;
594
if (go->predictor_2) {
595
p[0] = CI_PREDICTOR_2;
596
p[1] = CILEN_PREDICTOR_2;
597
if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) {
600
p += CILEN_PREDICTOR_2;
604
go->method = (p > p0)? p0[0]: -1;
610
* ccp_ackci - process a received configure-ack, and return
611
* 1 iff the packet was OK.
619
ccp_options *go = &ccp_gotoptions[f->unit];
623
if (len < CILEN_DEFLATE
624
|| p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
625
|| p[1] != CILEN_DEFLATE
626
|| p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
627
|| p[3] != DEFLATE_CHK_SEQUENCE)
630
len -= CILEN_DEFLATE;
631
/* XXX Cope with first/fast ack */
634
if (go->deflate_correct && go->deflate_draft) {
635
if (len < CILEN_DEFLATE
636
|| p[0] != CI_DEFLATE_DRAFT
637
|| p[1] != CILEN_DEFLATE
638
|| p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
639
|| p[3] != DEFLATE_CHK_SEQUENCE)
642
len -= CILEN_DEFLATE;
645
if (go->bsd_compress) {
646
if (len < CILEN_BSD_COMPRESS
647
|| p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS
648
|| p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
650
p += CILEN_BSD_COMPRESS;
651
len -= CILEN_BSD_COMPRESS;
652
/* XXX Cope with first/fast ack */
653
if (p == p0 && len == 0)
656
if (go->predictor_1) {
657
if (len < CILEN_PREDICTOR_1
658
|| p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1)
660
p += CILEN_PREDICTOR_1;
661
len -= CILEN_PREDICTOR_1;
662
/* XXX Cope with first/fast ack */
663
if (p == p0 && len == 0)
666
if (go->predictor_2) {
667
if (len < CILEN_PREDICTOR_2
668
|| p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2)
670
p += CILEN_PREDICTOR_2;
671
len -= CILEN_PREDICTOR_2;
672
/* XXX Cope with first/fast ack */
673
if (p == p0 && len == 0)
683
* ccp_nakci - process received configure-nak.
684
* Returns 1 iff the nak was OK.
692
ccp_options *go = &ccp_gotoptions[f->unit];
693
ccp_options no; /* options we've seen already */
694
ccp_options try; /* options to ask for next time */
696
memset(&no, 0, sizeof(no));
699
if (go->deflate && len >= CILEN_DEFLATE
700
&& p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
701
&& p[1] == CILEN_DEFLATE) {
704
* Peer wants us to use a different code size or something.
705
* Stop asking for Deflate if we don't understand his suggestion.
707
if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
708
|| DEFLATE_SIZE(p[2]) < DEFLATE_MIN_WORKS
709
|| p[3] != DEFLATE_CHK_SEQUENCE)
711
else if (DEFLATE_SIZE(p[2]) < go->deflate_size)
712
try.deflate_size = DEFLATE_SIZE(p[2]);
714
len -= CILEN_DEFLATE;
715
if (go->deflate_correct && go->deflate_draft
716
&& len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
717
&& p[1] == CILEN_DEFLATE) {
719
len -= CILEN_DEFLATE;
723
if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
724
&& p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
727
* Peer wants us to use a different number of bits
728
* or a different version.
730
if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION)
731
try.bsd_compress = 0;
732
else if (BSD_NBITS(p[2]) < go->bsd_bits)
733
try.bsd_bits = BSD_NBITS(p[2]);
734
p += CILEN_BSD_COMPRESS;
735
len -= CILEN_BSD_COMPRESS;
739
* Predictor-1 and 2 have no options, so they can't be Naked.
741
* There may be remaining options but we ignore them.
744
if (f->state != OPENED)
750
* ccp_rejci - reject some of our suggested compression methods.
758
ccp_options *go = &ccp_gotoptions[f->unit];
759
ccp_options try; /* options to request next time */
764
* Cope with empty configure-rejects by ceasing to send
765
* configure-requests.
767
if (len == 0 && all_rejected[f->unit])
770
if (go->deflate && len >= CILEN_DEFLATE
771
&& p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT)
772
&& p[1] == CILEN_DEFLATE) {
773
if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
774
|| p[3] != DEFLATE_CHK_SEQUENCE)
775
return 0; /* Rej is bad */
776
if (go->deflate_correct)
777
try.deflate_correct = 0;
779
try.deflate_draft = 0;
781
len -= CILEN_DEFLATE;
782
if (go->deflate_correct && go->deflate_draft
783
&& len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT
784
&& p[1] == CILEN_DEFLATE) {
785
if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size)
786
|| p[3] != DEFLATE_CHK_SEQUENCE)
787
return 0; /* Rej is bad */
788
try.deflate_draft = 0;
790
len -= CILEN_DEFLATE;
792
if (!try.deflate_correct && !try.deflate_draft)
795
if (go->bsd_compress && len >= CILEN_BSD_COMPRESS
796
&& p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) {
797
if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits))
799
try.bsd_compress = 0;
800
p += CILEN_BSD_COMPRESS;
801
len -= CILEN_BSD_COMPRESS;
803
if (go->predictor_1 && len >= CILEN_PREDICTOR_1
804
&& p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) {
806
p += CILEN_PREDICTOR_1;
807
len -= CILEN_PREDICTOR_1;
809
if (go->predictor_2 && len >= CILEN_PREDICTOR_2
810
&& p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) {
812
p += CILEN_PREDICTOR_2;
813
len -= CILEN_PREDICTOR_2;
819
if (f->state != OPENED)
826
* ccp_reqci - processed a received configure-request.
827
* Returns CONFACK, CONFNAK or CONFREJ and the packet modified
831
ccp_reqci(f, p, lenp, dont_nak)
837
int ret, newret, res;
839
int len, clen, type, nb;
840
ccp_options *ho = &ccp_hisoptions[f->unit];
841
ccp_options *ao = &ccp_allowoptions[f->unit];
847
memset(ho, 0, sizeof(ccp_options));
848
ho->method = (len > 0)? p[0]: -1;
852
if (len < 2 || p[1] < 2 || p[1] > len) {
863
case CI_DEFLATE_DRAFT:
864
if (!ao->deflate || clen != CILEN_DEFLATE
865
|| (!ao->deflate_correct && type == CI_DEFLATE)
866
|| (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) {
872
ho->deflate_size = nb = DEFLATE_SIZE(p[2]);
873
if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL
874
|| p[3] != DEFLATE_CHK_SEQUENCE
875
|| nb > ao->deflate_size || nb < DEFLATE_MIN_WORKS) {
878
p[2] = DEFLATE_MAKE_OPT(ao->deflate_size);
879
p[3] = DEFLATE_CHK_SEQUENCE;
880
/* fall through to test this #bits below */
886
* Check whether we can do Deflate with the window
887
* size they want. If the window is too big, reduce
888
* it until the kernel can cope and nak with that.
889
* We only check this for the first option.
893
res = ccp_test(f->unit, p, CILEN_DEFLATE, 1);
895
break; /* it's OK now */
896
if (res < 0 || nb == DEFLATE_MIN_WORKS || dont_nak) {
898
p[2] = DEFLATE_MAKE_OPT(ho->deflate_size);
903
p[2] = DEFLATE_MAKE_OPT(nb);
908
case CI_BSD_COMPRESS:
909
if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) {
914
ho->bsd_compress = 1;
915
ho->bsd_bits = nb = BSD_NBITS(p[2]);
916
if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION
917
|| nb > ao->bsd_bits || nb < BSD_MIN_BITS) {
920
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits);
921
/* fall through to test this #bits below */
927
* Check whether we can do BSD-Compress with the code
928
* size they want. If the code size is too big, reduce
929
* it until the kernel can cope and nak with that.
930
* We only check this for the first option.
934
res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1);
937
if (res < 0 || nb == BSD_MIN_BITS || dont_nak) {
939
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION,
945
p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb);
951
if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) {
958
&& ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) {
964
if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) {
971
&& ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) {
981
if (newret == CONFNAK && dont_nak)
983
if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) {
984
/* we're returning this option */
985
if (newret == CONFREJ && ret == CONFNAK)
989
BCOPY(p, retp, clen);
997
if (ret != CONFACK) {
998
if (ret == CONFREJ && *lenp == retp - p0)
999
all_rejected[f->unit] = 1;
1007
* Make a string name for a compression method (or 2).
1010
method_name(opt, opt2)
1011
ccp_options *opt, *opt2;
1013
static char result[64];
1015
if (!ANY_COMPRESS(*opt))
1017
switch (opt->method) {
1019
case CI_DEFLATE_DRAFT:
1020
if (opt2 != NULL && opt2->deflate_size != opt->deflate_size)
1021
slprintf(result, sizeof(result), "Deflate%s (%d/%d)",
1022
(opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1023
opt->deflate_size, opt2->deflate_size);
1025
slprintf(result, sizeof(result), "Deflate%s (%d)",
1026
(opt->method == CI_DEFLATE_DRAFT? "(old#)": ""),
1029
case CI_BSD_COMPRESS:
1030
if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits)
1031
slprintf(result, sizeof(result), "BSD-Compress (%d/%d)",
1032
opt->bsd_bits, opt2->bsd_bits);
1034
slprintf(result, sizeof(result), "BSD-Compress (%d)",
1037
case CI_PREDICTOR_1:
1038
return "Predictor 1";
1039
case CI_PREDICTOR_2:
1040
return "Predictor 2";
1042
slprintf(result, sizeof(result), "Method %d", opt->method);
1048
* CCP has come up - inform the kernel driver and log a message.
1054
ccp_options *go = &ccp_gotoptions[f->unit];
1055
ccp_options *ho = &ccp_hisoptions[f->unit];
1058
ccp_flags_set(f->unit, 1, 1);
1059
if (ANY_COMPRESS(*go)) {
1060
if (ANY_COMPRESS(*ho)) {
1061
if (go->method == ho->method) {
1062
notice("%s compression enabled", method_name(go, ho));
1064
strlcpy(method1, method_name(go, NULL), sizeof(method1));
1065
notice("%s / %s compression enabled",
1066
method1, method_name(ho, NULL));
1069
notice("%s receive compression enabled", method_name(go, NULL));
1070
} else if (ANY_COMPRESS(*ho))
1071
notice("%s transmit compression enabled", method_name(ho, NULL));
1075
* CCP has gone down - inform the kernel driver.
1081
if (ccp_localstate[f->unit] & RACK_PENDING)
1082
UNTIMEOUT(ccp_rack_timeout, f);
1083
ccp_localstate[f->unit] = 0;
1084
ccp_flags_set(f->unit, 1, 0);
1088
* Print the contents of a CCP packet.
1090
static char *ccp_codenames[] = {
1091
"ConfReq", "ConfAck", "ConfNak", "ConfRej",
1092
"TermReq", "TermAck", "CodeRej",
1093
NULL, NULL, NULL, NULL, NULL, NULL,
1094
"ResetReq", "ResetAck",
1098
ccp_printpkt(p, plen, printer, arg)
1101
void (*printer) __P((void *, char *, ...));
1104
u_char *p0, *optend;
1109
if (plen < HEADERLEN)
1113
len = (p[2] << 8) + p[3];
1114
if (len < HEADERLEN || len > plen)
1117
if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *)
1118
&& ccp_codenames[code-1] != NULL)
1119
printer(arg, " %s", ccp_codenames[code-1]);
1121
printer(arg, " code=0x%x", code);
1122
printer(arg, " id=0x%x", id);
1131
/* print list of possible compression methods */
1135
if (optlen < 2 || optlen > len)
1139
optend = p + optlen;
1142
case CI_DEFLATE_DRAFT:
1143
if (optlen >= CILEN_DEFLATE) {
1144
printer(arg, "deflate%s %d",
1145
(code == CI_DEFLATE_DRAFT? "(old#)": ""),
1146
DEFLATE_SIZE(p[2]));
1147
if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL)
1148
printer(arg, " method %d", DEFLATE_METHOD(p[2]));
1149
if (p[3] != DEFLATE_CHK_SEQUENCE)
1150
printer(arg, " check %d", p[3]);
1154
case CI_BSD_COMPRESS:
1155
if (optlen >= CILEN_BSD_COMPRESS) {
1156
printer(arg, "bsd v%d %d", BSD_VERSION(p[2]),
1158
p += CILEN_BSD_COMPRESS;
1161
case CI_PREDICTOR_1:
1162
if (optlen >= CILEN_PREDICTOR_1) {
1163
printer(arg, "predictor 1");
1164
p += CILEN_PREDICTOR_1;
1167
case CI_PREDICTOR_2:
1168
if (optlen >= CILEN_PREDICTOR_2) {
1169
printer(arg, "predictor 2");
1170
p += CILEN_PREDICTOR_2;
1175
printer(arg, " %.2x", *p++);
1182
if (len > 0 && *p >= ' ' && *p < 0x7f) {
1183
print_string((char *)p, len, printer, arg);
1190
/* dump out the rest of the packet in hex */
1192
printer(arg, " %.2x", *p++);
1198
* We have received a packet that the decompressor failed to
1199
* decompress. Here we would expect to issue a reset-request, but
1200
* Motorola has a patent on resetting the compressor as a result of
1201
* detecting an error in the decompressed data after decompression.
1202
* (See US patent 5,130,993; international patent publication number
1203
* WO 91/10289; Australian patent 73296/91.)
1205
* So we ask the kernel whether the error was detected after
1206
* decompression; if it was, we take CCP down, thus disabling
1207
* compression :-(, otherwise we issue the reset-request.
1210
ccp_datainput(unit, pkt, len)
1218
if (f->state == OPENED) {
1219
if (ccp_fatal_error(unit)) {
1221
* Disable compression by taking CCP down.
1223
error("Lost compression sync: disabling compression");
1224
ccp_close(unit, "Lost compression sync");
1227
* Send a reset-request to reset the peer's compressor.
1228
* We don't do that if we are still waiting for an
1229
* acknowledgement to a previous reset-request.
1231
if (!(ccp_localstate[f->unit] & RACK_PENDING)) {
1232
fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0);
1233
TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1234
ccp_localstate[f->unit] |= RACK_PENDING;
1236
ccp_localstate[f->unit] |= RREQ_REPEAT;
1242
* Timeout waiting for reset-ack.
1245
ccp_rack_timeout(arg)
1250
if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) {
1251
fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0);
1252
TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT);
1253
ccp_localstate[f->unit] &= ~RREQ_REPEAT;
1255
ccp_localstate[f->unit] &= ~RACK_PENDING;
added
removed
pppd/ccp.c
