2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
4 * Internet Initiative Japan, Inc (IIJ)
7 * Redistribution and use in source and binary forms, with or without
8 * 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.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $FreeBSD: src/usr.sbin/ppp/ccp.c,v 1.54.2.7 2002/09/01 02:12:22 brian Exp $
31 #include <sys/param.h>
32 #include <netinet/in.h>
33 #include <netinet/in_systm.h>
34 #include <netinet/ip.h>
35 #include <sys/socket.h>
41 #include <string.h> /* memcpy() on some archs */
54 #include "throughput.h"
56 #include "slcompress.h"
64 #include "descriptor.h"
80 static void CcpSendConfigReq(struct fsm *);
81 static void CcpSentTerminateReq(struct fsm *);
82 static void CcpSendTerminateAck(struct fsm *, u_char);
83 static void CcpDecodeConfig(struct fsm *, u_char *, u_char *, int,
85 static void CcpLayerStart(struct fsm *);
86 static void CcpLayerFinish(struct fsm *);
87 static int CcpLayerUp(struct fsm *);
88 static void CcpLayerDown(struct fsm *);
89 static void CcpInitRestartCounter(struct fsm *, int);
90 static int CcpRecvResetReq(struct fsm *);
91 static void CcpRecvResetAck(struct fsm *, u_char);
93 static struct fsm_callbacks ccp_Callbacks = {
98 CcpInitRestartCounter,
107 static const char * const ccp_TimerNames[] =
108 {"CCP restart", "CCP openmode", "CCP stopped"};
113 static char const * const cftypes[] = {
114 /* Check out the latest ``Compression Control Protocol'' rfc (1962) */
116 "PRED1", /* 1: Predictor type 1 */
117 "PRED2", /* 2: Predictor type 2 */
118 "PUDDLE", /* 3: Puddle Jumber */
119 NULL, NULL, NULL, NULL, NULL, NULL,
120 NULL, NULL, NULL, NULL, NULL, NULL,
121 "HWPPC", /* 16: Hewlett-Packard PPC */
122 "STAC", /* 17: Stac Electronics LZS (rfc1974) */
123 "MPPE", /* 18: Microsoft PPC (rfc2118) and */
124 /* Microsoft PPE (draft-ietf-pppext-mppe) */
125 "GAND", /* 19: Gandalf FZA (rfc1993) */
126 "V42BIS", /* 20: ARG->DATA.42bis compression */
127 "BSD", /* 21: BSD LZW Compress */
129 "LZS-DCP", /* 23: LZS-DCP Compression Protocol (rfc1967) */
130 "MAGNALINK/DEFLATE",/* 24: Magnalink Variable Resource (rfc1975) */
131 /* 24: Deflate (according to pppd-2.3.*) */
132 "DCE", /* 25: Data Circuit-Terminating Equip (rfc1976) */
133 "DEFLATE", /* 26: Deflate (rfc1979) */
136 if (proto < 0 || proto > sizeof cftypes / sizeof *cftypes ||
137 cftypes[proto] == NULL) {
140 return HexStr(proto, NULL, 0);
143 return cftypes[proto];
146 /* We support these algorithms, and Req them in the given order */
147 static const struct ccp_algorithm * const algorithm[] = {
150 &PppdDeflateAlgorithm
156 #define NALGORITHMS (sizeof algorithm/sizeof algorithm[0])
159 ccp_ReportStatus(struct cmdargs const *arg)
166 l = command_ChooseLink(arg);
169 prompt_Printf(arg->prompt, "%s: %s [%s]\n", l->name, ccp->fsm.name,
170 State2Nam(ccp->fsm.state));
171 if (ccp->fsm.state == ST_OPENED) {
172 prompt_Printf(arg->prompt, " My protocol = %s, His protocol = %s\n",
173 protoname(ccp->my_proto), protoname(ccp->his_proto));
174 prompt_Printf(arg->prompt, " Output: %ld --> %ld, Input: %ld --> %ld\n",
175 ccp->uncompout, ccp->compout,
176 ccp->compin, ccp->uncompin);
179 if (ccp->in.algorithm != -1)
180 prompt_Printf(arg->prompt, "\n Input Options: %s\n",
181 (*algorithm[ccp->in.algorithm]->Disp)(&ccp->in.opt));
183 if (ccp->out.algorithm != -1) {
185 for (f = 0; f < ccp->out.algorithm; f++)
186 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]))
188 prompt_Printf(arg->prompt, " Output Options: %s\n",
189 (*algorithm[ccp->out.algorithm]->Disp)(&(*o)->val));
192 prompt_Printf(arg->prompt, "\n Defaults: ");
193 prompt_Printf(arg->prompt, "FSM retry = %us, max %u Config"
194 " REQ%s, %u Term REQ%s\n", ccp->cfg.fsm.timeout,
195 ccp->cfg.fsm.maxreq, ccp->cfg.fsm.maxreq == 1 ? "" : "s",
196 ccp->cfg.fsm.maxtrm, ccp->cfg.fsm.maxtrm == 1 ? "" : "s");
197 prompt_Printf(arg->prompt, " deflate windows: ");
198 prompt_Printf(arg->prompt, "incoming = %d, ", ccp->cfg.deflate.in.winsize);
199 prompt_Printf(arg->prompt, "outgoing = %d\n", ccp->cfg.deflate.out.winsize);
201 prompt_Printf(arg->prompt, " MPPE: ");
202 if (ccp->cfg.mppe.keybits)
203 prompt_Printf(arg->prompt, "%d bits, ", ccp->cfg.mppe.keybits);
205 prompt_Printf(arg->prompt, "any bits, ");
206 switch (ccp->cfg.mppe.state) {
208 prompt_Printf(arg->prompt, "stateful");
211 prompt_Printf(arg->prompt, "stateless");
214 prompt_Printf(arg->prompt, "any state");
217 prompt_Printf(arg->prompt, "%s\n",
218 ccp->cfg.mppe.required ? ", required" : "");
221 prompt_Printf(arg->prompt, "\n DEFLATE: %s\n",
222 command_ShowNegval(ccp->cfg.neg[CCP_NEG_DEFLATE]));
223 prompt_Printf(arg->prompt, " PREDICTOR1: %s\n",
224 command_ShowNegval(ccp->cfg.neg[CCP_NEG_PRED1]));
225 prompt_Printf(arg->prompt, " DEFLATE24: %s\n",
226 command_ShowNegval(ccp->cfg.neg[CCP_NEG_DEFLATE24]));
228 prompt_Printf(arg->prompt, " MPPE: %s\n",
229 command_ShowNegval(ccp->cfg.neg[CCP_NEG_MPPE]));
235 ccp_SetupCallbacks(struct ccp *ccp)
237 ccp->fsm.fn = &ccp_Callbacks;
238 ccp->fsm.FsmTimer.name = ccp_TimerNames[0];
239 ccp->fsm.OpenTimer.name = ccp_TimerNames[1];
240 ccp->fsm.StoppedTimer.name = ccp_TimerNames[2];
244 ccp_Init(struct ccp *ccp, struct bundle *bundle, struct link *l,
245 const struct fsm_parent *parent)
247 /* Initialise ourselves */
249 fsm_Init(&ccp->fsm, "CCP", PROTO_CCP, 1, CCP_MAXCODE, LogCCP,
250 bundle, l, parent, &ccp_Callbacks, ccp_TimerNames);
252 ccp->cfg.deflate.in.winsize = 0;
253 ccp->cfg.deflate.out.winsize = 15;
254 ccp->cfg.fsm.timeout = DEF_FSMRETRY;
255 ccp->cfg.fsm.maxreq = DEF_FSMTRIES;
256 ccp->cfg.fsm.maxtrm = DEF_FSMTRIES;
257 ccp->cfg.neg[CCP_NEG_DEFLATE] = NEG_ENABLED|NEG_ACCEPTED;
258 ccp->cfg.neg[CCP_NEG_PRED1] = NEG_ENABLED|NEG_ACCEPTED;
259 ccp->cfg.neg[CCP_NEG_DEFLATE24] = 0;
261 ccp->cfg.mppe.keybits = 0;
262 ccp->cfg.mppe.state = MPPE_ANYSTATE;
263 ccp->cfg.mppe.required = 0;
264 ccp->cfg.neg[CCP_NEG_MPPE] = NEG_ENABLED|NEG_ACCEPTED;
271 ccp_Setup(struct ccp *ccp)
273 /* Set ourselves up for a startup */
274 ccp->fsm.open_mode = 0;
275 ccp->his_proto = ccp->my_proto = -1;
276 ccp->reset_sent = ccp->last_reset = -1;
277 ccp->in.algorithm = ccp->out.algorithm = -1;
278 ccp->in.state = ccp->out.state = NULL;
279 ccp->in.opt.hdr.id = -1;
281 ccp->his_reject = ccp->my_reject = 0;
282 ccp->uncompout = ccp->compout = 0;
283 ccp->uncompin = ccp->compin = 0;
287 * Is ccp *REQUIRED* ?
288 * We ask each of the configured ccp protocols if they're required and
289 * return TRUE if they are.
291 * It's not possible for the peer to reject a required ccp protocol
292 * without our state machine bringing the supporting lcp layer down.
294 * If ccp is required but not open, the NCP layer should not push
295 * any data into the link.
298 ccp_Required(struct ccp *ccp)
302 for (f = 0; f < NALGORITHMS; f++)
303 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) &&
304 (*algorithm[f]->Required)(&ccp->fsm))
311 * Report whether it's possible to increase a packet's size after
312 * compression (and by how much).
315 ccp_MTUOverhead(struct ccp *ccp)
317 if (ccp->fsm.state == ST_OPENED && ccp->out.algorithm >= 0)
318 return algorithm[ccp->out.algorithm]->o.MTUOverhead;
324 CcpInitRestartCounter(struct fsm *fp, int what)
326 /* Set fsm timer load */
327 struct ccp *ccp = fsm2ccp(fp);
329 fp->FsmTimer.load = ccp->cfg.fsm.timeout * SECTICKS;
332 fp->restart = ccp->cfg.fsm.maxreq;
335 fp->restart = ccp->cfg.fsm.maxtrm;
344 CcpSendConfigReq(struct fsm *fp)
346 /* Send config REQ please */
347 struct ccp *ccp = fsm2ccp(fp);
349 u_char *cp, buff[100];
354 alloc = ccp->his_reject == 0 && ccp->out.opt == NULL;
356 ccp->out.algorithm = -1;
357 for (f = 0; f < NALGORITHMS; f++)
358 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) &&
359 !REJECTED(ccp, algorithm[f]->id) &&
360 (*algorithm[f]->Usable)(fp)) {
363 for (o = &ccp->out.opt; *o != NULL; o = &(*o)->next)
364 if ((*o)->val.hdr.id == algorithm[f]->id && (*o)->algorithm == f)
367 if (alloc || *o == NULL) {
368 *o = (struct ccp_opt *)malloc(sizeof(struct ccp_opt));
369 (*o)->val.hdr.id = algorithm[f]->id;
370 (*o)->val.hdr.len = 2;
373 (*algorithm[f]->o.OptInit)(fp->bundle, &(*o)->val, &ccp->cfg);
376 if (cp + (*o)->val.hdr.len > buff + sizeof buff) {
377 log_Printf(LogERROR, "%s: CCP REQ buffer overrun !\n", fp->link->name);
380 memcpy(cp, &(*o)->val, (*o)->val.hdr.len);
381 cp += (*o)->val.hdr.len;
383 ccp->my_proto = (*o)->val.hdr.id;
384 ccp->out.algorithm = f;
390 fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, cp - buff, MB_CCPOUT);
394 ccp_SendResetReq(struct fsm *fp)
396 /* We can't read our input - ask peer to reset */
397 struct ccp *ccp = fsm2ccp(fp);
399 ccp->reset_sent = fp->reqid;
400 ccp->last_reset = -1;
401 fsm_Output(fp, CODE_RESETREQ, fp->reqid, NULL, 0, MB_CCPOUT);
405 CcpSentTerminateReq(struct fsm *fp)
407 /* Term REQ just sent by FSM */
411 CcpSendTerminateAck(struct fsm *fp, u_char id)
413 /* Send Term ACK please */
414 fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_CCPOUT);
418 CcpRecvResetReq(struct fsm *fp)
420 /* Got a reset REQ, reset outgoing dictionary */
421 struct ccp *ccp = fsm2ccp(fp);
422 if (ccp->out.state == NULL)
424 return (*algorithm[ccp->out.algorithm]->o.Reset)(ccp->out.state);
428 CcpLayerStart(struct fsm *fp)
430 /* We're about to start up ! */
431 struct ccp *ccp = fsm2ccp(fp);
433 log_Printf(LogCCP, "%s: LayerStart.\n", fp->link->name);
434 fp->more.reqs = fp->more.naks = fp->more.rejs = ccp->cfg.fsm.maxreq * 3;
438 CcpLayerDown(struct fsm *fp)
440 /* About to come down */
441 struct ccp *ccp = fsm2ccp(fp);
442 struct ccp_opt *next;
444 log_Printf(LogCCP, "%s: LayerDown.\n", fp->link->name);
445 if (ccp->in.state != NULL) {
446 (*algorithm[ccp->in.algorithm]->i.Term)(ccp->in.state);
447 ccp->in.state = NULL;
448 ccp->in.algorithm = -1;
450 if (ccp->out.state != NULL) {
451 (*algorithm[ccp->out.algorithm]->o.Term)(ccp->out.state);
452 ccp->out.state = NULL;
453 ccp->out.algorithm = -1;
455 ccp->his_reject = ccp->my_reject = 0;
457 while (ccp->out.opt) {
458 next = ccp->out.opt->next;
466 CcpLayerFinish(struct fsm *fp)
469 struct ccp *ccp = fsm2ccp(fp);
470 struct ccp_opt *next;
472 log_Printf(LogCCP, "%s: LayerFinish.\n", fp->link->name);
475 * Nuke options that may be left over from sending a REQ but never
478 while (ccp->out.opt) {
479 next = ccp->out.opt->next;
484 if (ccp_Required(ccp)) {
485 if (fp->link->lcp.fsm.state == ST_OPENED)
486 log_Printf(LogLCP, "%s: Closing due to CCP completion\n", fp->link->name);
487 fsm_Close(&fp->link->lcp.fsm);
491 /* Called when CCP has reached the OPEN state */
493 CcpLayerUp(struct fsm *fp)
496 struct ccp *ccp = fsm2ccp(fp);
500 for (f = fail = 0; f < NALGORITHMS; f++)
501 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]) &&
502 (*algorithm[f]->Required)(&ccp->fsm) &&
503 (ccp->in.algorithm != f || ccp->out.algorithm != f)) {
504 /* Blow it all away - we haven't negotiated a required algorithm */
505 log_Printf(LogWARN, "%s: Failed to negotiate (required) %s\n",
506 fp->link->name, protoname(algorithm[f]->id));
511 ccp->his_proto = ccp->my_proto = -1;
513 fsm_Close(&fp->link->lcp.fsm);
517 log_Printf(LogCCP, "%s: LayerUp.\n", fp->link->name);
519 if (ccp->in.state == NULL && ccp->in.algorithm >= 0 &&
520 ccp->in.algorithm < NALGORITHMS) {
521 ccp->in.state = (*algorithm[ccp->in.algorithm]->i.Init)
522 (fp->bundle, &ccp->in.opt);
523 if (ccp->in.state == NULL) {
524 log_Printf(LogERROR, "%s: %s (in) initialisation failure\n",
525 fp->link->name, protoname(ccp->his_proto));
526 ccp->his_proto = ccp->my_proto = -1;
533 for (f = 0; f < ccp->out.algorithm; f++)
534 if (IsEnabled(ccp->cfg.neg[algorithm[f]->Neg]))
537 if (ccp->out.state == NULL && ccp->out.algorithm >= 0 &&
538 ccp->out.algorithm < NALGORITHMS) {
539 ccp->out.state = (*algorithm[ccp->out.algorithm]->o.Init)
540 (fp->bundle, &(*o)->val);
541 if (ccp->out.state == NULL) {
542 log_Printf(LogERROR, "%s: %s (out) initialisation failure\n",
543 fp->link->name, protoname(ccp->my_proto));
544 ccp->his_proto = ccp->my_proto = -1;
550 fp->more.reqs = fp->more.naks = fp->more.rejs = ccp->cfg.fsm.maxreq * 3;
552 log_Printf(LogCCP, "%s: Out = %s[%d], In = %s[%d]\n",
553 fp->link->name, protoname(ccp->my_proto), ccp->my_proto,
554 protoname(ccp->his_proto), ccp->his_proto);
560 CcpDecodeConfig(struct fsm *fp, u_char *cp, u_char *end, int mode_type,
561 struct fsm_decode *dec)
563 /* Deal with incoming data */
564 struct ccp *ccp = fsm2ccp(fp);
569 if (mode_type == MODE_REQ)
570 ccp->in.algorithm = -1; /* In case we've received two REQs in a row */
572 while (end - cp >= sizeof(opt->hdr)) {
573 if ((opt = fsm_readopt(&cp)) == NULL)
576 for (f = NALGORITHMS-1; f > -1; f--)
577 if (algorithm[f]->id == opt->hdr.id)
580 disp = f == -1 ? "" : (*algorithm[f]->Disp)(opt);
584 log_Printf(LogCCP, " %s[%d] %s\n", protoname(opt->hdr.id),
588 /* Don't understand that :-( */
589 if (mode_type == MODE_REQ) {
590 ccp->my_reject |= (1 << opt->hdr.id);
598 if (IsAccepted(ccp->cfg.neg[algorithm[f]->Neg]) &&
599 (*algorithm[f]->Usable)(fp) &&
600 ccp->in.algorithm == -1) {
601 memcpy(&ccp->in.opt, opt, opt->hdr.len);
602 switch ((*algorithm[f]->i.Set)(fp->bundle, &ccp->in.opt, &ccp->cfg)) {
604 fsm_rej(dec, &ccp->in.opt);
607 fsm_nak(dec, &ccp->in.opt);
610 fsm_ack(dec, &ccp->in.opt);
611 ccp->his_proto = opt->hdr.id;
612 ccp->in.algorithm = f; /* This one'll do :-) */
620 for (o = ccp->out.opt; o != NULL; o = o->next)
621 if (o->val.hdr.id == opt->hdr.id)
624 log_Printf(LogCCP, "%s: Warning: Ignoring peer NAK of unsent"
625 " option\n", fp->link->name);
627 memcpy(&o->val, opt, opt->hdr.len);
628 if ((*algorithm[f]->o.Set)(fp->bundle, &o->val, &ccp->cfg) ==
630 ccp->my_proto = algorithm[f]->id;
632 ccp->his_reject |= (1 << opt->hdr.id);
634 if (algorithm[f]->Required(fp)) {
635 log_Printf(LogWARN, "%s: Cannot understand peers (required)"
636 " %s negotiation\n", fp->link->name,
637 protoname(algorithm[f]->id));
638 fsm_Close(&fp->link->lcp.fsm);
644 ccp->his_reject |= (1 << opt->hdr.id);
646 if (algorithm[f]->Required(fp)) {
647 log_Printf(LogWARN, "%s: Peer rejected (required) %s negotiation\n",
648 fp->link->name, protoname(algorithm[f]->id));
649 fsm_Close(&fp->link->lcp.fsm);
656 if (mode_type != MODE_NOP) {
657 fsm_opt_normalise(dec);
658 if (dec->rejend != dec->rej || dec->nakend != dec->nak) {
659 if (ccp->in.state == NULL) {
661 ccp->in.algorithm = -1;
668 ccp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
670 /* Got PROTO_CCP from link */
671 m_settype(bp, MB_CCPIN);
672 if (bundle_Phase(bundle) == PHASE_NETWORK)
673 fsm_Input(&l->ccp.fsm, bp);
675 if (bundle_Phase(bundle) < PHASE_NETWORK)
676 log_Printf(LogCCP, "%s: Error: Unexpected CCP in phase %s (ignored)\n",
677 l->ccp.fsm.link->name, bundle_PhaseName(bundle));
684 CcpRecvResetAck(struct fsm *fp, u_char id)
686 /* Got a reset ACK, reset incoming dictionary */
687 struct ccp *ccp = fsm2ccp(fp);
689 if (ccp->reset_sent != -1) {
690 if (id != ccp->reset_sent) {
691 log_Printf(LogCCP, "%s: Incorrect ResetAck (id %d, not %d)"
692 " ignored\n", fp->link->name, id, ccp->reset_sent);
695 /* Whaddaya know - a correct reset ack */
696 } else if (id == ccp->last_reset)
697 log_Printf(LogCCP, "%s: Duplicate ResetAck (resetting again)\n",
700 log_Printf(LogCCP, "%s: Unexpected ResetAck (id %d) ignored\n",
705 ccp->last_reset = ccp->reset_sent;
706 ccp->reset_sent = -1;
707 if (ccp->in.state != NULL)
708 (*algorithm[ccp->in.algorithm]->i.Reset)(ccp->in.state);
712 ccp_LayerPush(struct bundle *b, struct link *l, struct mbuf *bp,
713 int pri, u_short *proto)
715 if (PROTO_COMPRESSIBLE(*proto)) {
716 if (l->ccp.fsm.state != ST_OPENED) {
717 if (ccp_Required(&l->ccp)) {
718 /* The NCP layer shouldn't have let this happen ! */
719 log_Printf(LogERROR, "%s: Unexpected attempt to use an unopened and"
720 " required CCP layer\n", l->name);
724 } else if (l->ccp.out.state != NULL) {
725 bp = (*algorithm[l->ccp.out.algorithm]->o.Write)
726 (l->ccp.out.state, &l->ccp, l, pri, proto, bp);
729 m_settype(bp, MB_ICOMPDOUT);
732 m_settype(bp, MB_COMPDOUT);
742 ccp_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, u_short *proto)
745 * If proto isn't PROTO_[I]COMPD, we still want to pass it to the
746 * decompression routines so that the dictionary's updated
748 if (l->ccp.fsm.state == ST_OPENED) {
749 if (*proto == PROTO_COMPD || *proto == PROTO_ICOMPD) {
750 /* Decompress incoming data */
751 if (l->ccp.reset_sent != -1)
752 /* Send another REQ and put the packet in the bit bucket */
753 fsm_Output(&l->ccp.fsm, CODE_RESETREQ, l->ccp.reset_sent, NULL, 0,
755 else if (l->ccp.in.state != NULL) {
756 bp = (*algorithm[l->ccp.in.algorithm]->i.Read)
757 (l->ccp.in.state, &l->ccp, proto, bp);
760 m_settype(bp, MB_ICOMPDIN);
763 m_settype(bp, MB_COMPDIN);
770 } else if (PROTO_COMPRESSIBLE(*proto) && l->ccp.in.state != NULL) {
771 /* Add incoming Network Layer traffic to our dictionary */
772 (*algorithm[l->ccp.in.algorithm]->i.DictSetup)
773 (l->ccp.in.state, &l->ccp, *proto, bp);
781 ccp_Proto(struct ccp *ccp)
783 return !link2physical(ccp->fsm.link) || !ccp->fsm.bundle->ncp.mp.active ?
784 PROTO_COMPD : PROTO_ICOMPD;
788 ccp_SetOpenMode(struct ccp *ccp)
792 for (f = 0; f < CCP_NEG_TOTAL; f++)
793 if (IsEnabled(ccp->cfg.neg[f])) {
794 ccp->fsm.open_mode = 0;
798 ccp->fsm.open_mode = OPEN_PASSIVE; /* Go straight to ST_STOPPED ? */
800 for (f = 0; f < CCP_NEG_TOTAL; f++)
801 if (IsAccepted(ccp->cfg.neg[f]))
804 return 0; /* No CCP at all */
808 ccp_DefaultUsable(struct fsm *fp)
814 ccp_DefaultRequired(struct fsm *fp)
819 struct layer ccplayer = { LAYER_CCP, "ccp", ccp_LayerPush, ccp_LayerPull };