1 /*****************************************************************************
2 * lcp.c - Network Link Control Protocol program file.
4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
5 * portions Copyright (c) 1997 by Global Election Systems Inc.
7 * The authors hereby grant permission to use, copy, modify, distribute,
8 * and license this software and its documentation for any purpose, provided
9 * that existing copyright notices are retained in all copies and that this
10 * notice and the following disclaimer are included verbatim in any
11 * distributions. No written agreement, license, or royalty fee is required
12 * for any of the authorized uses.
14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 ******************************************************************************
28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
30 * 97-12-01 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
32 *****************************************************************************/
35 * lcp.c - PPP Link Control Protocol.
37 * Copyright (c) 1989 Carnegie Mellon University.
38 * All rights reserved.
40 * Redistribution and use in source and binary forms are permitted
41 * provided that the above copyright notice and this paragraph are
42 * duplicated in all such forms and that any documentation,
43 * advertising materials, and other materials related to such
44 * distribution and use acknowledge that the software was developed
45 * by Carnegie Mellon University. The name of the
46 * University may not be used to endorse or promote products derived
47 * from this software without specific prior written permission.
48 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
49 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
50 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
65 /*************************/
66 /*** LOCAL DEFINITIONS ***/
67 /*************************/
69 * Length of each type of configuration option (in octets)
73 #define CILEN_SHORT 4 /* CILEN_VOID + sizeof(short) */
74 #define CILEN_CHAP 5 /* CILEN_VOID + sizeof(short) + 1 */
75 #define CILEN_LONG 6 /* CILEN_VOID + sizeof(long) */
76 #define CILEN_LQR 8 /* CILEN_VOID + sizeof(short) + sizeof(long) */
80 /***********************************/
81 /*** LOCAL FUNCTION DECLARATIONS ***/
82 /***********************************/
84 * Callbacks for fsm code. (CI = Configuration Information)
86 static void lcp_resetci (fsm*); /* Reset our CI */
87 static int lcp_cilen (fsm*); /* Return length of our CI */
88 static void lcp_addci (fsm*, u_char*, int*); /* Add our CI to pkt */
89 static int lcp_ackci (fsm*, u_char*, int);/* Peer ack'd our CI */
90 static int lcp_nakci (fsm*, u_char*, int);/* Peer nak'd our CI */
91 static int lcp_rejci (fsm*, u_char*, int);/* Peer rej'd our CI */
92 static int lcp_reqci (fsm*, u_char*, int*, int); /* Rcv peer CI */
93 static void lcp_up (fsm*); /* We're UP */
94 static void lcp_down (fsm*); /* We're DOWN */
95 static void lcp_starting (fsm*); /* We need lower layer up */
96 static void lcp_finished (fsm*); /* We need lower layer down */
97 static int lcp_extcode (fsm*, int, u_char, u_char*, int);
99 static void lcp_rprotrej (fsm*, u_char*, int);
102 * routines to send LCP echos to peer
104 static void lcp_echo_lowerup (int);
105 static void lcp_echo_lowerdown (int);
106 static void LcpEchoTimeout (void*);
107 static void lcp_received_echo_reply (fsm*, int, u_char*, int);
108 static void LcpSendEchoRequest (fsm*);
109 static void LcpLinkFailure (fsm*);
110 static void LcpEchoCheck (fsm*);
113 * Protocol entry points.
114 * Some of these are called directly.
116 static void lcp_input (int, u_char *, int);
117 static void lcp_protrej (int);
119 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
120 (x) == CONFNAK ? "NAK" : "REJ")
123 /******************************/
124 /*** PUBLIC DATA STRUCTURES ***/
125 /******************************/
127 LinkPhase lcp_phase[NUM_PPP]; /* Phase of link session (RFC 1661) */
128 lcp_options lcp_wantoptions[NUM_PPP]; /* Options that we want to request */
129 lcp_options lcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
130 lcp_options lcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
131 lcp_options lcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
132 ext_accm xmit_accm[NUM_PPP]; /* extended transmit ACCM */
136 /*****************************/
137 /*** LOCAL DATA STRUCTURES ***/
138 /*****************************/
139 static fsm lcp_fsm[NUM_PPP]; /* LCP fsm structure (global)*/
140 static u_int lcp_echo_interval = LCP_ECHOINTERVAL; /* Interval between LCP echo-requests */
141 static u_int lcp_echo_fails = LCP_MAXECHOFAILS; /* Tolerance to unanswered echo-requests */
142 static u32_t lcp_echos_pending = 0; /* Number of outstanding echo msgs */
143 static u32_t lcp_echo_number = 0; /* ID number of next echo frame */
144 static u32_t lcp_echo_timer_running = 0; /* TRUE if a timer is running */
146 static u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */
148 static fsm_callbacks lcp_callbacks = { /* LCP callback routines */
149 lcp_resetci, /* Reset our Configuration Information */
150 lcp_cilen, /* Length of our Configuration Information */
151 lcp_addci, /* Add our Configuration Information */
152 lcp_ackci, /* ACK our Configuration Information */
153 lcp_nakci, /* NAK our Configuration Information */
154 lcp_rejci, /* Reject our Configuration Information */
155 lcp_reqci, /* Request peer's Configuration Information */
156 lcp_up, /* Called when fsm reaches OPENED state */
157 lcp_down, /* Called when fsm leaves OPENED state */
158 lcp_starting, /* Called when we want the lower layer up */
159 lcp_finished, /* Called when we want the lower layer down */
160 NULL, /* Called when Protocol-Reject received */
161 NULL, /* Retransmission is necessary */
162 lcp_extcode, /* Called to handle LCP-specific codes */
163 "LCP" /* String name of protocol */
166 struct protent lcp_protent = {
188 int lcp_loopbackfail = DEFLOOPBACKFAIL;
192 /***********************************/
193 /*** PUBLIC FUNCTION DEFINITIONS ***/
194 /***********************************/
196 * lcp_init - Initialize LCP.
198 void lcp_init(int unit)
200 fsm *f = &lcp_fsm[unit];
201 lcp_options *wo = &lcp_wantoptions[unit];
202 lcp_options *ao = &lcp_allowoptions[unit];
205 f->protocol = PPP_LCP;
206 f->callbacks = &lcp_callbacks;
212 wo->restart = 0; /* Set to 1 in kernels or multi-line
215 wo->mru = PPP_DEFMRU;
216 wo->neg_asyncmap = 1;
217 wo->asyncmap = 0x00000000l; /* Assume don't need to escape any ctl chars. */
218 wo->neg_chap = 0; /* Set to 1 on server */
219 wo->neg_upap = 0; /* Set to 1 on server */
220 wo->chap_mdtype = CHAP_DIGEST_MD5;
221 wo->neg_magicnumber = 1;
222 wo->neg_pcompression = 1;
223 wo->neg_accompression = 1;
224 wo->neg_lqr = 0; /* no LQR implementation yet */
228 ao->mru = PPP_MAXMRU;
229 ao->neg_asyncmap = 1;
230 ao->asyncmap = 0x00000000l; /* Assume don't need to escape any ctl chars. */
231 ao->neg_chap = (CHAP_SUPPORT != 0);
232 ao->chap_mdtype = CHAP_DIGEST_MD5;
233 ao->neg_upap = (PAP_SUPPORT != 0);
234 ao->neg_magicnumber = 1;
235 ao->neg_pcompression = 1;
236 ao->neg_accompression = 1;
237 ao->neg_lqr = 0; /* no LQR implementation yet */
238 ao->neg_cbcp = (CBCP_SUPPORT != 0);
241 * Set transmit escape for the flag and escape characters plus anything
242 * set for the allowable options.
244 memset(xmit_accm[unit], 0, sizeof(xmit_accm[0]));
245 xmit_accm[unit][15] = 0x60;
246 xmit_accm[unit][0] = (u_char)(ao->asyncmap & 0xFF);
247 xmit_accm[unit][1] = (u_char)((ao->asyncmap >> 8) & 0xFF);
248 xmit_accm[unit][2] = (u_char)((ao->asyncmap >> 16) & 0xFF);
249 xmit_accm[unit][3] = (u_char)((ao->asyncmap >> 24) & 0xFF);
250 LCPDEBUG((LOG_INFO, "lcp_init: xmit_accm=%X %X %X %X\n",
254 xmit_accm[unit][3]));
256 lcp_phase[unit] = PHASE_INITIALIZE;
261 * lcp_open - LCP is allowed to come up.
263 void lcp_open(int unit)
265 fsm *f = &lcp_fsm[unit];
266 lcp_options *wo = &lcp_wantoptions[unit];
270 f->flags |= OPT_PASSIVE;
272 f->flags |= OPT_SILENT;
275 lcp_phase[unit] = PHASE_ESTABLISH;
280 * lcp_close - Take LCP down.
282 void lcp_close(int unit, char *reason)
284 fsm *f = &lcp_fsm[unit];
286 if (lcp_phase[unit] != PHASE_DEAD)
287 lcp_phase[unit] = PHASE_TERMINATE;
288 if (f->state == STOPPED && f->flags & (OPT_PASSIVE|OPT_SILENT)) {
290 * This action is not strictly according to the FSM in RFC1548,
291 * but it does mean that the program terminates if you do an
292 * lcp_close() in passive/silent mode when a connection hasn't
299 fsm_close(&lcp_fsm[unit], reason);
304 * lcp_lowerup - The lower layer is up.
306 void lcp_lowerup(int unit)
308 lcp_options *wo = &lcp_wantoptions[unit];
311 * Don't use A/C or protocol compression on transmission,
312 * but accept A/C and protocol compressed packets
313 * if we are going to ask for A/C and protocol compression.
315 ppp_set_xaccm(unit, &xmit_accm[unit]);
316 ppp_send_config(unit, PPP_MRU, 0xffffffffl, 0, 0);
317 ppp_recv_config(unit, PPP_MRU, 0x00000000l,
318 wo->neg_pcompression, wo->neg_accompression);
319 peer_mru[unit] = PPP_MRU;
320 lcp_allowoptions[unit].asyncmap
321 = (u_long)xmit_accm[unit][0]
322 | ((u_long)xmit_accm[unit][1] << 8)
323 | ((u_long)xmit_accm[unit][2] << 16)
324 | ((u_long)xmit_accm[unit][3] << 24);
325 LCPDEBUG((LOG_INFO, "lcp_lowerup: asyncmap=%X %X %X %X\n",
329 xmit_accm[unit][0]));
331 fsm_lowerup(&lcp_fsm[unit]);
336 * lcp_lowerdown - The lower layer is down.
338 void lcp_lowerdown(int unit)
340 fsm_lowerdown(&lcp_fsm[unit]);
344 * lcp_sprotrej - Send a Protocol-Reject for some protocol.
346 void lcp_sprotrej(int unit, u_char *p, int len)
349 * Send back the protocol and the information field of the
350 * rejected packet. We only get here if LCP is in the OPENED state.
353 fsm_sdata(&lcp_fsm[unit], PROTREJ, ++lcp_fsm[unit].id,
359 /**********************************/
360 /*** LOCAL FUNCTION DEFINITIONS ***/
361 /**********************************/
363 * lcp_input - Input LCP packet.
365 static void lcp_input(int unit, u_char *p, int len)
367 fsm *f = &lcp_fsm[unit];
369 fsm_input(f, p, len);
374 * lcp_extcode - Handle a LCP-specific code.
376 static int lcp_extcode(fsm *f, int code, u_char id, u_char *inp, int len)
382 lcp_rprotrej(f, inp, len);
386 if (f->state != OPENED)
388 LCPDEBUG((LOG_INFO, "lcp: Echo-Request, Rcvd id %d\n", id));
390 PUTLONG(lcp_gotoptions[f->unit].magicnumber, magp);
391 fsm_sdata(f, ECHOREP, id, inp, len);
395 lcp_received_echo_reply(f, id, inp, len);
409 * lcp_rprotrej - Receive an Protocol-Reject.
411 * Figure out which protocol is rejected and inform it.
413 static void lcp_rprotrej(fsm *f, u_char *inp, int len)
416 struct protent *protp;
419 if (len < sizeof (u_short)) {
421 "lcp_rprotrej: Rcvd short Protocol-Reject packet!\n"));
428 "lcp_rprotrej: Rcvd Protocol-Reject packet for %x!\n",
432 * Protocol-Reject packets received in any state other than the LCP
433 * OPENED state SHOULD be silently discarded.
435 if( f->state != OPENED ){
436 LCPDEBUG((LOG_INFO, "Protocol-Reject discarded: LCP in state %d\n",
442 * Upcall the proper Protocol-Reject routine.
444 for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i)
445 if (protp->protocol == prot && protp->enabled_flag) {
446 (*protp->protrej)(f->unit);
450 LCPDEBUG((LOG_WARNING, "Protocol-Reject for unsupported protocol 0x%x\n",
456 * lcp_protrej - A Protocol-Reject was received.
458 static void lcp_protrej(int unit)
464 LCPDEBUG((LOG_WARNING,
465 "lcp_protrej: Received Protocol-Reject for LCP!\n"));
466 fsm_protreject(&lcp_fsm[unit]);
471 * lcp_resetci - Reset our CI.
473 static void lcp_resetci(fsm *f)
475 lcp_wantoptions[f->unit].magicnumber = magic();
476 lcp_wantoptions[f->unit].numloops = 0;
477 lcp_gotoptions[f->unit] = lcp_wantoptions[f->unit];
478 peer_mru[f->unit] = PPP_MRU;
484 * lcp_cilen - Return length of our CI.
486 static int lcp_cilen(fsm *f)
488 lcp_options *go = &lcp_gotoptions[f->unit];
490 #define LENCIVOID(neg) ((neg) ? CILEN_VOID : 0)
491 #define LENCICHAP(neg) ((neg) ? CILEN_CHAP : 0)
492 #define LENCISHORT(neg) ((neg) ? CILEN_SHORT : 0)
493 #define LENCILONG(neg) ((neg) ? CILEN_LONG : 0)
494 #define LENCILQR(neg) ((neg) ? CILEN_LQR: 0)
495 #define LENCICBCP(neg) ((neg) ? CILEN_CBCP: 0)
497 * NB: we only ask for one of CHAP and UPAP, even if we will
500 return (LENCISHORT(go->neg_mru && go->mru != PPP_DEFMRU) +
501 LENCILONG(go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl) +
502 LENCICHAP(go->neg_chap) +
503 LENCISHORT(!go->neg_chap && go->neg_upap) +
504 LENCILQR(go->neg_lqr) +
505 LENCICBCP(go->neg_cbcp) +
506 LENCILONG(go->neg_magicnumber) +
507 LENCIVOID(go->neg_pcompression) +
508 LENCIVOID(go->neg_accompression));
513 * lcp_addci - Add our desired CIs to a packet.
515 static void lcp_addci(fsm *f, u_char *ucp, int *lenp)
517 lcp_options *go = &lcp_gotoptions[f->unit];
518 u_char *start_ucp = ucp;
520 #define ADDCIVOID(opt, neg) \
522 LCPDEBUG((LOG_INFO, "lcp_addci: opt=%d\n", opt)); \
524 PUTCHAR(CILEN_VOID, ucp); \
526 #define ADDCISHORT(opt, neg, val) \
528 LCPDEBUG((LOG_INFO, "lcp_addci: INT opt=%d %X\n", opt, val)); \
530 PUTCHAR(CILEN_SHORT, ucp); \
531 PUTSHORT(val, ucp); \
533 #define ADDCICHAP(opt, neg, val, digest) \
535 LCPDEBUG((LOG_INFO, "lcp_addci: CHAP opt=%d %X\n", opt, val)); \
537 PUTCHAR(CILEN_CHAP, ucp); \
538 PUTSHORT(val, ucp); \
539 PUTCHAR(digest, ucp); \
541 #define ADDCILONG(opt, neg, val) \
543 LCPDEBUG((LOG_INFO, "lcp_addci: L opt=%d %lX\n", opt, val)); \
545 PUTCHAR(CILEN_LONG, ucp); \
548 #define ADDCILQR(opt, neg, val) \
550 LCPDEBUG((LOG_INFO, "lcp_addci: LQR opt=%d %lX\n", opt, val)); \
552 PUTCHAR(CILEN_LQR, ucp); \
553 PUTSHORT(PPP_LQR, ucp); \
556 #define ADDCICHAR(opt, neg, val) \
558 LCPDEBUG((LOG_INFO, "lcp_addci: CHAR opt=%d %X '%z'\n", opt, val, val)); \
560 PUTCHAR(CILEN_CHAR, ucp); \
564 ADDCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru);
565 ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl,
567 ADDCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype);
568 ADDCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
569 ADDCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
570 ADDCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
571 ADDCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
572 ADDCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
573 ADDCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
575 if (ucp - start_ucp != *lenp) {
576 /* this should never happen, because peer_mtu should be 1500 */
577 LCPDEBUG((LOG_ERR, "Bug in lcp_addci: wrong length\n"));
583 * lcp_ackci - Ack our CIs.
584 * This should not modify any state if the Ack is bad.
590 static int lcp_ackci(fsm *f, u_char *p, int len)
592 lcp_options *go = &lcp_gotoptions[f->unit];
593 u_char cilen, citype, cichar;
598 * CIs must be in exactly the same order that we sent.
599 * Check packet length and CI length at each step.
600 * If we find any deviations, then this packet is bad.
602 #define ACKCIVOID(opt, neg) \
604 if ((len -= CILEN_VOID) < 0) \
606 GETCHAR(citype, p); \
608 if (cilen != CILEN_VOID || \
612 #define ACKCISHORT(opt, neg, val) \
614 if ((len -= CILEN_SHORT) < 0) \
616 GETCHAR(citype, p); \
618 if (cilen != CILEN_SHORT || \
621 GETSHORT(cishort, p); \
622 if (cishort != val) \
625 #define ACKCICHAR(opt, neg, val) \
627 if ((len -= CILEN_CHAR) < 0) \
629 GETCHAR(citype, p); \
631 if (cilen != CILEN_CHAR || \
634 GETCHAR(cichar, p); \
638 #define ACKCICHAP(opt, neg, val, digest) \
640 if ((len -= CILEN_CHAP) < 0) \
642 GETCHAR(citype, p); \
644 if (cilen != CILEN_CHAP || \
647 GETSHORT(cishort, p); \
648 if (cishort != val) \
650 GETCHAR(cichar, p); \
651 if (cichar != digest) \
654 #define ACKCILONG(opt, neg, val) \
656 if ((len -= CILEN_LONG) < 0) \
658 GETCHAR(citype, p); \
660 if (cilen != CILEN_LONG || \
663 GETLONG(cilong, p); \
667 #define ACKCILQR(opt, neg, val) \
669 if ((len -= CILEN_LQR) < 0) \
671 GETCHAR(citype, p); \
673 if (cilen != CILEN_LQR || \
676 GETSHORT(cishort, p); \
677 if (cishort != PPP_LQR) \
679 GETLONG(cilong, p); \
684 ACKCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru);
685 ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl,
687 ACKCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype);
688 ACKCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
689 ACKCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
690 ACKCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
691 ACKCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
692 ACKCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
693 ACKCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
696 * If there are any remaining CIs, then this packet is bad.
700 LCPDEBUG((LOG_INFO, "lcp_acki: Ack\n"));
703 LCPDEBUG((LOG_WARNING, "lcp_acki: received bad Ack!\n"));
709 * lcp_nakci - Peer has sent a NAK for some of our CIs.
710 * This should not modify any state if the Nak is bad
711 * or if LCP is in the OPENED state.
717 static int lcp_nakci(fsm *f, u_char *p, int len)
719 lcp_options *go = &lcp_gotoptions[f->unit];
720 lcp_options *wo = &lcp_wantoptions[f->unit];
721 u_char citype, cichar, *next;
724 lcp_options no; /* options we've seen Naks for */
725 lcp_options try; /* options to request next time */
729 BZERO(&no, sizeof(no));
733 * Any Nak'd CIs must be in exactly the same order that we sent.
734 * Check packet length and CI length at each step.
735 * If we find any deviations, then this packet is bad.
737 #define NAKCIVOID(opt, neg, code) \
739 len >= CILEN_VOID && \
740 p[1] == CILEN_VOID && \
743 INCPTR(CILEN_VOID, p); \
747 #define NAKCICHAP(opt, neg, code) \
749 len >= CILEN_CHAP && \
750 p[1] == CILEN_CHAP && \
754 GETSHORT(cishort, p); \
755 GETCHAR(cichar, p); \
759 #define NAKCICHAR(opt, neg, code) \
761 len >= CILEN_CHAR && \
762 p[1] == CILEN_CHAR && \
766 GETCHAR(cichar, p); \
770 #define NAKCISHORT(opt, neg, code) \
772 len >= CILEN_SHORT && \
773 p[1] == CILEN_SHORT && \
775 len -= CILEN_SHORT; \
777 GETSHORT(cishort, p); \
781 #define NAKCILONG(opt, neg, code) \
783 len >= CILEN_LONG && \
784 p[1] == CILEN_LONG && \
788 GETLONG(cilong, p); \
792 #define NAKCILQR(opt, neg, code) \
794 len >= CILEN_LQR && \
795 p[1] == CILEN_LQR && \
799 GETSHORT(cishort, p); \
800 GETLONG(cilong, p); \
806 * We don't care if they want to send us smaller packets than
807 * we want. Therefore, accept any MRU less than what we asked for,
808 * but then ignore the new value when setting the MRU in the kernel.
809 * If they send us a bigger MRU than what we asked, accept it, up to
810 * the limit of the default MRU we'd get if we didn't negotiate.
812 if (go->neg_mru && go->mru != PPP_DEFMRU) {
813 NAKCISHORT(CI_MRU, neg_mru,
814 if (cishort <= wo->mru || cishort < PPP_DEFMRU)
820 * Add any characters they want to our (receive-side) asyncmap.
822 if (go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl) {
823 NAKCILONG(CI_ASYNCMAP, neg_asyncmap,
824 try.asyncmap = go->asyncmap | cilong;
829 * If they've nak'd our authentication-protocol, check whether
830 * they are proposing a different protocol, or a different
831 * hash algorithm for CHAP.
833 if ((go->neg_chap || go->neg_upap)
834 && len >= CILEN_SHORT
835 && p[0] == CI_AUTHTYPE && p[1] >= CILEN_SHORT && p[1] <= len) {
838 no.neg_chap = go->neg_chap;
839 no.neg_upap = go->neg_upap;
841 GETSHORT(cishort, p);
842 if (cishort == PPP_PAP && cilen == CILEN_SHORT) {
844 * If we were asking for CHAP, they obviously don't want to do it.
845 * If we weren't asking for CHAP, then we were asking for PAP,
846 * in which case this Nak is bad.
852 } else if (cishort == PPP_CHAP && cilen == CILEN_CHAP) {
856 * We were asking for CHAP/MD5; they must want a different
857 * algorithm. If they can't do MD5, we'll have to stop
860 if (cichar != go->chap_mdtype)
864 * Stop asking for PAP if we were asking for it.
871 * We don't recognize what they're suggesting.
872 * Stop asking for what we were asking for.
878 p += cilen - CILEN_SHORT;
883 * If they can't cope with our link quality protocol, we'll have
884 * to stop asking for LQR. We haven't got any other protocol.
885 * If they Nak the reporting period, take their value XXX ?
887 NAKCILQR(CI_QUALITY, neg_lqr,
888 if (cishort != PPP_LQR)
891 try.lqr_period = cilong;
895 * Only implementing CBCP...not the rest of the callback options
897 NAKCICHAR(CI_CALLBACK, neg_cbcp,
902 * Check for a looped-back line.
904 NAKCILONG(CI_MAGICNUMBER, neg_magicnumber,
905 try.magicnumber = magic();
910 * Peer shouldn't send Nak for protocol compression or
911 * address/control compression requests; they should send
912 * a Reject instead. If they send a Nak, treat it as a Reject.
914 NAKCIVOID(CI_PCOMPRESSION, neg_pcompression,
915 try.neg_pcompression = 0;
917 NAKCIVOID(CI_ACCOMPRESSION, neg_accompression,
918 try.neg_accompression = 0;
922 * There may be remaining CIs, if the peer is requesting negotiation
923 * on an option that we didn't include in our request packet.
924 * If we see an option that we requested, or one we've already seen
925 * in this packet, then this packet is bad.
926 * If we wanted to respond by starting to negotiate on the requested
927 * option(s), we could, but we don't, because except for the
928 * authentication type and quality protocol, if we are not negotiating
929 * an option, it is because we were told not to.
930 * For the authentication type, the Nak from the peer means
931 * `let me authenticate myself with you' which is a bit pointless.
932 * For the quality protocol, the Nak means `ask me to send you quality
933 * reports', but if we didn't ask for them, we don't want them.
934 * An option we don't recognize represents the peer asking to
935 * negotiate some option we don't support, so ignore it.
937 while (len > CILEN_VOID) {
940 if (cilen < CILEN_VOID || (len -= cilen) < 0)
942 next = p + cilen - 2;
946 if ((go->neg_mru && go->mru != PPP_DEFMRU)
947 || no.neg_mru || cilen != CILEN_SHORT)
949 GETSHORT(cishort, p);
950 if (cishort < PPP_DEFMRU)
954 if ((go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl)
955 || no.neg_asyncmap || cilen != CILEN_LONG)
959 if (go->neg_chap || no.neg_chap || go->neg_upap || no.neg_upap)
963 if (go->neg_magicnumber || no.neg_magicnumber ||
967 case CI_PCOMPRESSION:
968 if (go->neg_pcompression || no.neg_pcompression
969 || cilen != CILEN_VOID)
972 case CI_ACCOMPRESSION:
973 if (go->neg_accompression || no.neg_accompression
974 || cilen != CILEN_VOID)
978 if (go->neg_lqr || no.neg_lqr || cilen != CILEN_LQR)
985 /* If there is still anything left, this packet is bad. */
990 * OK, the Nak is good. Now we can update state.
992 if (f->state != OPENED) {
994 if (++try.numloops >= lcp_loopbackfail) {
995 LCPDEBUG((LOG_NOTICE, "Serial line is looped back.\n"));
996 lcp_close(f->unit, "Loopback detected");
1007 LCPDEBUG((LOG_WARNING, "lcp_nakci: received bad Nak!\n"));
1013 * lcp_rejci - Peer has Rejected some of our CIs.
1014 * This should not modify any state if the Reject is bad
1015 * or if LCP is in the OPENED state.
1018 * 0 - Reject was bad.
1019 * 1 - Reject was good.
1021 static int lcp_rejci(fsm *f, u_char *p, int len)
1023 lcp_options *go = &lcp_gotoptions[f->unit];
1027 lcp_options try; /* options to request next time */
1032 * Any Rejected CIs must be in exactly the same order that we sent.
1033 * Check packet length and CI length at each step.
1034 * If we find any deviations, then this packet is bad.
1036 #define REJCIVOID(opt, neg) \
1038 len >= CILEN_VOID && \
1039 p[1] == CILEN_VOID && \
1041 len -= CILEN_VOID; \
1042 INCPTR(CILEN_VOID, p); \
1044 LCPDEBUG((LOG_INFO, "lcp_rejci: void opt %d rejected\n", opt)); \
1046 #define REJCISHORT(opt, neg, val) \
1048 len >= CILEN_SHORT && \
1049 p[1] == CILEN_SHORT && \
1051 len -= CILEN_SHORT; \
1053 GETSHORT(cishort, p); \
1054 /* Check rejected value. */ \
1055 if (cishort != val) \
1058 LCPDEBUG((LOG_INFO,"lcp_rejci: short opt %d rejected\n", opt)); \
1060 #define REJCICHAP(opt, neg, val, digest) \
1062 len >= CILEN_CHAP && \
1063 p[1] == CILEN_CHAP && \
1065 len -= CILEN_CHAP; \
1067 GETSHORT(cishort, p); \
1068 GETCHAR(cichar, p); \
1069 /* Check rejected value. */ \
1070 if (cishort != val || cichar != digest) \
1074 LCPDEBUG((LOG_INFO,"lcp_rejci: chap opt %d rejected\n", opt)); \
1076 #define REJCILONG(opt, neg, val) \
1078 len >= CILEN_LONG && \
1079 p[1] == CILEN_LONG && \
1081 len -= CILEN_LONG; \
1083 GETLONG(cilong, p); \
1084 /* Check rejected value. */ \
1085 if (cilong != val) \
1088 LCPDEBUG((LOG_INFO,"lcp_rejci: long opt %d rejected\n", opt)); \
1090 #define REJCILQR(opt, neg, val) \
1092 len >= CILEN_LQR && \
1093 p[1] == CILEN_LQR && \
1097 GETSHORT(cishort, p); \
1098 GETLONG(cilong, p); \
1099 /* Check rejected value. */ \
1100 if (cishort != PPP_LQR || cilong != val) \
1103 LCPDEBUG((LOG_INFO,"lcp_rejci: LQR opt %d rejected\n", opt)); \
1105 #define REJCICBCP(opt, neg, val) \
1107 len >= CILEN_CBCP && \
1108 p[1] == CILEN_CBCP && \
1110 len -= CILEN_CBCP; \
1112 GETCHAR(cichar, p); \
1113 /* Check rejected value. */ \
1114 if (cichar != val) \
1117 LCPDEBUG((LOG_INFO,"lcp_rejci: Callback opt %d rejected\n", opt)); \
1120 REJCISHORT(CI_MRU, neg_mru, go->mru);
1121 REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap);
1122 REJCICHAP(CI_AUTHTYPE, neg_chap, PPP_CHAP, go->chap_mdtype);
1123 if (!go->neg_chap) {
1124 REJCISHORT(CI_AUTHTYPE, neg_upap, PPP_PAP);
1126 REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period);
1127 REJCICBCP(CI_CALLBACK, neg_cbcp, CBCP_OPT);
1128 REJCILONG(CI_MAGICNUMBER, neg_magicnumber, go->magicnumber);
1129 REJCIVOID(CI_PCOMPRESSION, neg_pcompression);
1130 REJCIVOID(CI_ACCOMPRESSION, neg_accompression);
1133 * If there are any remaining CIs, then this packet is bad.
1138 * Now we can update state.
1140 if (f->state != OPENED)
1145 LCPDEBUG((LOG_WARNING, "lcp_rejci: received bad Reject!\n"));
1151 * lcp_reqci - Check the peer's requested CIs and send appropriate response.
1153 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1154 * appropriately. If reject_if_disagree is non-zero, doesn't return
1155 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1157 static int lcp_reqci(fsm *f,
1158 u_char *inp, /* Requested CIs */
1159 int *lenp, /* Length of requested CIs */
1160 int reject_if_disagree)
1162 lcp_options *go = &lcp_gotoptions[f->unit];
1163 lcp_options *ho = &lcp_hisoptions[f->unit];
1164 lcp_options *ao = &lcp_allowoptions[f->unit];
1165 u_char *cip, *next; /* Pointer to current and next CIs */
1166 int cilen, citype, cichar; /* Parsed len, type, char value */
1167 u_short cishort; /* Parsed short value */
1168 u32_t cilong; /* Parse long value */
1169 int rc = CONFACK; /* Final packet return code */
1170 int orc; /* Individual option return code */
1171 u_char *p; /* Pointer to next char to parse */
1172 u_char *rejp; /* Pointer to next char in reject frame */
1173 u_char *nakp; /* Pointer to next char in Nak frame */
1174 int l = *lenp; /* Length left */
1181 * Reset all his options.
1183 BZERO(ho, sizeof(*ho));
1186 * Process all his options.
1192 orc = CONFACK; /* Assume success */
1193 cip = p = next; /* Remember begining of CI */
1194 if (l < 2 || /* Not enough data for CI header or */
1195 p[1] < 2 || /* CI length too small or */
1196 p[1] > l) { /* CI length too big? */
1197 LCPDEBUG((LOG_WARNING, "lcp_reqci: bad CI length!\n"));
1198 orc = CONFREJ; /* Reject bad CI */
1199 cilen = l; /* Reject till end of packet */
1200 l = 0; /* Don't loop again */
1204 GETCHAR(citype, p); /* Parse CI type */
1205 GETCHAR(cilen, p); /* Parse CI length */
1206 l -= cilen; /* Adjust remaining length */
1207 next += cilen; /* Step to next CI */
1209 switch (citype) { /* Check CI type */
1211 if (!ao->neg_mru) { /* Allow option? */
1212 LCPDEBUG((LOG_INFO, "lcp_reqci: Reject MRU - not allowed\n"));
1213 orc = CONFREJ; /* Reject CI */
1215 } else if (cilen != CILEN_SHORT) { /* Check CI length */
1216 LCPDEBUG((LOG_INFO, "lcp_reqci: Reject MRU - bad length\n"));
1217 orc = CONFREJ; /* Reject CI */
1220 GETSHORT(cishort, p); /* Parse MRU */
1223 * He must be able to receive at least our minimum.
1224 * No need to check a maximum. If he sends a large number,
1225 * we'll just ignore it.
1227 if (cishort < PPP_MINMRU) {
1228 LCPDEBUG((LOG_INFO, "lcp_reqci: Nak - MRU too small\n"));
1229 orc = CONFNAK; /* Nak CI */
1230 PUTCHAR(CI_MRU, nakp);
1231 PUTCHAR(CILEN_SHORT, nakp);
1232 PUTSHORT(PPP_MINMRU, nakp); /* Give him a hint */
1235 ho->neg_mru = 1; /* Remember he sent MRU */
1236 ho->mru = cishort; /* And remember value */
1238 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " MRU %d", cishort);
1239 traceNdx = strlen(traceBuf);
1244 if (!ao->neg_asyncmap) {
1245 LCPDEBUG((LOG_INFO, "lcp_reqci: Reject ASYNCMAP not allowed\n"));
1248 } else if (cilen != CILEN_LONG) {
1249 LCPDEBUG((LOG_INFO, "lcp_reqci: Reject ASYNCMAP bad length\n"));
1256 * Asyncmap must have set at least the bits
1257 * which are set in lcp_allowoptions[unit].asyncmap.
1259 if ((ao->asyncmap & ~cilong) != 0) {
1260 LCPDEBUG((LOG_INFO, "lcp_reqci: Nak ASYNCMAP %lX missing %lX\n",
1261 cilong, ao->asyncmap));
1263 PUTCHAR(CI_ASYNCMAP, nakp);
1264 PUTCHAR(CILEN_LONG, nakp);
1265 PUTLONG(ao->asyncmap | cilong, nakp);
1268 ho->neg_asyncmap = 1;
1269 ho->asyncmap = cilong;
1271 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " ASYNCMAP=%lX", cilong);
1272 traceNdx = strlen(traceBuf);
1277 if (cilen < CILEN_SHORT) {
1278 LCPDEBUG((LOG_INFO, "lcp_reqci: Reject AUTHTYPE missing arg\n"));
1281 } else if (!(ao->neg_upap || ao->neg_chap)) {
1283 * Reject the option if we're not willing to authenticate.
1285 LCPDEBUG((LOG_INFO, "lcp_reqci: Reject AUTHTYPE not allowed\n"));
1289 GETSHORT(cishort, p);
1292 * Authtype must be UPAP or CHAP.
1294 * Note: if both ao->neg_upap and ao->neg_chap are set,
1295 * and the peer sends a Configure-Request with two
1296 * authenticate-protocol requests, one for CHAP and one
1297 * for UPAP, then we will reject the second request.
1298 * Whether we end up doing CHAP or UPAP depends then on
1299 * the ordering of the CIs in the peer's Configure-Request.
1302 if (cishort == PPP_PAP) {
1303 if (ho->neg_chap) { /* we've already accepted CHAP */
1304 LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE PAP already accepted\n"));
1307 } else if (cilen != CILEN_SHORT) {
1308 LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE PAP bad len\n"));
1312 if (!ao->neg_upap) { /* we don't want to do PAP */
1313 LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE PAP not allowed\n"));
1314 orc = CONFNAK; /* NAK it and suggest CHAP */
1315 PUTCHAR(CI_AUTHTYPE, nakp);
1316 PUTCHAR(CILEN_CHAP, nakp);
1317 PUTSHORT(PPP_CHAP, nakp);
1318 PUTCHAR(ao->chap_mdtype, nakp);
1323 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " PAP (%X)", cishort);
1324 traceNdx = strlen(traceBuf);
1328 if (cishort == PPP_CHAP) {
1329 if (ho->neg_upap) { /* we've already accepted PAP */
1330 LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE CHAP accepted PAP\n"));
1333 } else if (cilen != CILEN_CHAP) {
1334 LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE CHAP bad len\n"));
1338 if (!ao->neg_chap) { /* we don't want to do CHAP */
1339 LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE CHAP not allowed\n"));
1340 orc = CONFNAK; /* NAK it and suggest PAP */
1341 PUTCHAR(CI_AUTHTYPE, nakp);
1342 PUTCHAR(CILEN_SHORT, nakp);
1343 PUTSHORT(PPP_PAP, nakp);
1346 GETCHAR(cichar, p); /* get digest type*/
1347 if (cichar != CHAP_DIGEST_MD5
1349 && cichar != CHAP_MICROSOFT
1352 LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE CHAP digest=%d\n", cichar));
1354 PUTCHAR(CI_AUTHTYPE, nakp);
1355 PUTCHAR(CILEN_CHAP, nakp);
1356 PUTSHORT(PPP_CHAP, nakp);
1357 PUTCHAR(ao->chap_mdtype, nakp);
1361 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CHAP %X,%d", cishort, cichar);
1362 traceNdx = strlen(traceBuf);
1364 ho->chap_mdtype = cichar; /* save md type */
1370 * We don't recognize the protocol they're asking for.
1371 * Nak it with something we're willing to do.
1372 * (At this point we know ao->neg_upap || ao->neg_chap.)
1375 PUTCHAR(CI_AUTHTYPE, nakp);
1377 LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE %d req CHAP\n", cishort));
1378 PUTCHAR(CILEN_CHAP, nakp);
1379 PUTSHORT(PPP_CHAP, nakp);
1380 PUTCHAR(ao->chap_mdtype, nakp);
1383 LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE %d req PAP\n", cishort));
1384 PUTCHAR(CILEN_SHORT, nakp);
1385 PUTSHORT(PPP_PAP, nakp);
1390 GETSHORT(cishort, p);
1393 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " QUALITY (%x %x)", cishort, (unsigned int) cilong);
1394 traceNdx = strlen(traceBuf);
1398 cilen != CILEN_LQR) {
1404 * Check the protocol and the reporting period.
1405 * XXX When should we Nak this, and what with?
1407 if (cishort != PPP_LQR) {
1409 PUTCHAR(CI_QUALITY, nakp);
1410 PUTCHAR(CILEN_LQR, nakp);
1411 PUTSHORT(PPP_LQR, nakp);
1412 PUTLONG(ao->lqr_period, nakp);
1417 case CI_MAGICNUMBER:
1418 if (!(ao->neg_magicnumber || go->neg_magicnumber) ||
1419 cilen != CILEN_LONG) {
1425 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " MAGICNUMBER (%lX)", cilong);
1426 traceNdx = strlen(traceBuf);
1430 * He must have a different magic number.
1432 if (go->neg_magicnumber &&
1433 cilong == go->magicnumber) {
1434 cilong = magic(); /* Don't put magic() inside macro! */
1436 PUTCHAR(CI_MAGICNUMBER, nakp);
1437 PUTCHAR(CILEN_LONG, nakp);
1438 PUTLONG(cilong, nakp);
1441 ho->neg_magicnumber = 1;
1442 ho->magicnumber = cilong;
1446 case CI_PCOMPRESSION:
1448 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " PCOMPRESSION");
1449 traceNdx = strlen(traceBuf);
1451 if (!ao->neg_pcompression ||
1452 cilen != CILEN_VOID) {
1456 ho->neg_pcompression = 1;
1459 case CI_ACCOMPRESSION:
1461 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " ACCOMPRESSION");
1462 traceNdx = strlen(traceBuf);
1464 if (!ao->neg_accompression ||
1465 cilen != CILEN_VOID) {
1469 ho->neg_accompression = 1;
1474 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_MRRU");
1475 traceNdx = strlen(traceBuf);
1482 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_SSNHF");
1483 traceNdx = strlen(traceBuf);
1490 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_EPDISC");
1491 traceNdx = strlen(traceBuf);
1498 snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " unknown %d", citype);
1499 traceNdx = strlen(traceBuf);
1507 if (traceNdx >= 80 - 32) {
1508 LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd%s\n", traceBuf));
1512 if (orc == CONFACK && /* Good CI */
1513 rc != CONFACK) /* but prior CI wasnt? */
1514 continue; /* Don't send this one */
1516 if (orc == CONFNAK) { /* Nak this CI? */
1517 if (reject_if_disagree /* Getting fed up with sending NAKs? */
1518 && citype != CI_MAGICNUMBER) {
1519 orc = CONFREJ; /* Get tough if so */
1522 if (rc == CONFREJ) /* Rejecting prior CI? */
1523 continue; /* Don't send this one */
1527 if (orc == CONFREJ) { /* Reject this CI */
1529 if (cip != rejp) /* Need to move rejected CI? */
1530 BCOPY(cip, rejp, cilen); /* Move it */
1531 INCPTR(cilen, rejp); /* Update output pointer */
1536 * If we wanted to send additional NAKs (for unsent CIs), the
1537 * code would go here. The extra NAKs would go at *nakp.
1538 * At present there are no cases where we want to ask the
1539 * peer to negotiate an option.
1544 *lenp = (int)(next - inp);
1548 * Copy the Nak'd options from the nak_buffer to the caller's buffer.
1550 *lenp = (int)(nakp - nak_buffer);
1551 BCOPY(nak_buffer, inp, *lenp);
1554 *lenp = (int)(rejp - inp);
1560 LCPDEBUG((LOG_INFO, "lcp_reqci: %s\n", traceBuf));
1563 LCPDEBUG((LOG_INFO, "lcp_reqci: returning CONF%s.\n", CODENAME(rc)));
1564 return (rc); /* Return final code */
1569 * lcp_up - LCP has come UP.
1571 static void lcp_up(fsm *f)
1573 lcp_options *wo = &lcp_wantoptions[f->unit];
1574 lcp_options *ho = &lcp_hisoptions[f->unit];
1575 lcp_options *go = &lcp_gotoptions[f->unit];
1576 lcp_options *ao = &lcp_allowoptions[f->unit];
1578 if (!go->neg_magicnumber)
1579 go->magicnumber = 0;
1580 if (!ho->neg_magicnumber)
1581 ho->magicnumber = 0;
1584 * Set our MTU to the smaller of the MTU we wanted and
1585 * the MRU our peer wanted. If we negotiated an MRU,
1586 * set our MRU to the larger of value we wanted and
1587 * the value we got in the negotiation.
1589 ppp_send_config(f->unit, LWIP_MIN(ao->mru, (ho->neg_mru? ho->mru: PPP_MRU)),
1590 (ho->neg_asyncmap? ho->asyncmap: 0xffffffffl),
1591 ho->neg_pcompression, ho->neg_accompression);
1593 * If the asyncmap hasn't been negotiated, we really should
1594 * set the receive asyncmap to ffffffff, but we set it to 0
1595 * for backwards contemptibility.
1597 ppp_recv_config(f->unit, (go->neg_mru? LWIP_MAX(wo->mru, go->mru): PPP_MRU),
1598 (go->neg_asyncmap? go->asyncmap: 0x00000000),
1599 go->neg_pcompression, go->neg_accompression);
1602 peer_mru[f->unit] = ho->mru;
1604 lcp_echo_lowerup(f->unit); /* Enable echo messages */
1606 link_established(f->unit);
1611 * lcp_down - LCP has gone DOWN.
1613 * Alert other protocols.
1615 static void lcp_down(fsm *f)
1617 lcp_options *go = &lcp_gotoptions[f->unit];
1619 lcp_echo_lowerdown(f->unit);
1623 ppp_send_config(f->unit, PPP_MRU, 0xffffffffl, 0, 0);
1624 ppp_recv_config(f->unit, PPP_MRU,
1625 (go->neg_asyncmap? go->asyncmap: 0x00000000),
1626 go->neg_pcompression, go->neg_accompression);
1627 peer_mru[f->unit] = PPP_MRU;
1632 * lcp_starting - LCP needs the lower layer up.
1634 static void lcp_starting(fsm *f)
1636 link_required(f->unit);
1641 * lcp_finished - LCP has finished with the lower layer.
1643 static void lcp_finished(fsm *f)
1645 link_terminated(f->unit);
1651 * print_string - print a readable representation of a string using
1654 static void print_string(
1657 void (*printer) (void *, char *, ...),
1664 for (; len > 0; --len) {
1666 if (' ' <= c && c <= '~') {
1667 if (c == '\\' || c == '"')
1669 printer(arg, "%c", c);
1673 printer(arg, "\\n");
1676 printer(arg, "\\r");
1679 printer(arg, "\\t");
1682 printer(arg, "\\%.3o", c);
1691 * lcp_printpkt - print the contents of an LCP packet.
1693 static char *lcp_codenames[] = {
1694 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1695 "TermReq", "TermAck", "CodeRej", "ProtRej",
1696 "EchoReq", "EchoRep", "DiscReq"
1699 static int lcp_printpkt(
1702 void (*printer) (void *, char *, ...),
1706 int code, id, len, olen;
1707 u_char *pstart, *optend;
1711 if (plen < HEADERLEN)
1717 if (len < HEADERLEN || len > plen)
1720 if (code >= 1 && code <= sizeof(lcp_codenames) / sizeof(char *))
1721 printer(arg, " %s", lcp_codenames[code-1]);
1723 printer(arg, " code=0x%x", code);
1724 printer(arg, " id=0x%x", id);
1731 /* print option list */
1736 if (olen < 2 || olen > len) {
1744 if (olen == CILEN_SHORT) {
1746 GETSHORT(cishort, p);
1747 printer(arg, "mru %d", cishort);
1751 if (olen == CILEN_LONG) {
1754 printer(arg, "asyncmap 0x%lx", cilong);
1758 if (olen >= CILEN_SHORT) {
1760 printer(arg, "auth ");
1761 GETSHORT(cishort, p);
1764 printer(arg, "pap");
1767 printer(arg, "chap");
1770 printer(arg, "0x%x", cishort);
1775 if (olen >= CILEN_SHORT) {
1777 printer(arg, "quality ");
1778 GETSHORT(cishort, p);
1781 printer(arg, "lqr");
1784 printer(arg, "0x%x", cishort);
1789 if (olen >= CILEN_CHAR) {
1791 printer(arg, "callback ");
1792 GETSHORT(cishort, p);
1795 printer(arg, "CBCP");
1798 printer(arg, "0x%x", cishort);
1802 case CI_MAGICNUMBER:
1803 if (olen == CILEN_LONG) {
1806 printer(arg, "magic 0x%x", cilong);
1809 case CI_PCOMPRESSION:
1810 if (olen == CILEN_VOID) {
1812 printer(arg, "pcomp");
1815 case CI_ACCOMPRESSION:
1816 if (olen == CILEN_VOID) {
1818 printer(arg, "accomp");
1822 while (p < optend) {
1824 printer(arg, " %.2x", code);
1832 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1834 print_string((char*)p, len, printer, arg);
1845 printer(arg, " magic=0x%x", cilong);
1852 /* print the rest of the bytes in the packet */
1853 for (; len > 0; --len) {
1855 printer(arg, " %.2x", code);
1858 return (int)(p - pstart);
1863 * Time to shut down the link because there is nothing out there.
1866 static void LcpLinkFailure (fsm *f)
1868 if (f->state == OPENED) {
1869 LCPDEBUG((LOG_INFO, "No response to %d echo-requests\n", lcp_echos_pending));
1870 LCPDEBUG((LOG_NOTICE, "Serial link appears to be disconnected.\n"));
1871 lcp_close(f->unit, "Peer not responding");
1876 * Timer expired for the LCP echo requests from this process.
1879 static void LcpEchoCheck (fsm *f)
1881 LcpSendEchoRequest (f);
1884 * Start the timer for the next interval.
1886 LWIP_ASSERT("lcp_echo_timer_running == 0", lcp_echo_timer_running == 0);
1888 TIMEOUT (LcpEchoTimeout, f, lcp_echo_interval);
1889 lcp_echo_timer_running = 1;
1893 * LcpEchoTimeout - Timer expired on the LCP echo
1896 static void LcpEchoTimeout (void *arg)
1898 if (lcp_echo_timer_running != 0) {
1899 lcp_echo_timer_running = 0;
1900 LcpEchoCheck ((fsm *) arg);
1905 * LcpEchoReply - LCP has received a reply to the echo
1907 static void lcp_received_echo_reply (fsm *f, int id, u_char *inp, int len)
1913 /* Check the magic number - don't count replies from ourselves. */
1915 LCPDEBUG((LOG_WARNING, "lcp: received short Echo-Reply, length %d\n", len));
1918 GETLONG(magic, inp);
1919 if (lcp_gotoptions[f->unit].neg_magicnumber
1920 && magic == lcp_gotoptions[f->unit].magicnumber) {
1921 LCPDEBUG((LOG_WARNING, "appear to have received our own echo-reply!\n"));
1925 /* Reset the number of outstanding echo frames */
1926 lcp_echos_pending = 0;
1930 * LcpSendEchoRequest - Send an echo request frame to the peer
1933 static void LcpSendEchoRequest (fsm *f)
1936 u_char pkt[4], *pktp;
1939 * Detect the failure of the peer at this point.
1941 if (lcp_echo_fails != 0) {
1942 if (lcp_echos_pending++ >= lcp_echo_fails) {
1944 lcp_echos_pending = 0;
1949 * Make and send the echo request frame.
1951 if (f->state == OPENED) {
1952 lcp_magic = lcp_gotoptions[f->unit].magicnumber;
1954 PUTLONG(lcp_magic, pktp);
1955 fsm_sdata(f, ECHOREQ, (u_char)(lcp_echo_number++ & 0xFF), pkt, (int)(pktp - pkt));
1960 * lcp_echo_lowerup - Start the timer for the LCP frame
1963 static void lcp_echo_lowerup (int unit)
1965 fsm *f = &lcp_fsm[unit];
1967 /* Clear the parameters for generating echo frames */
1968 lcp_echos_pending = 0;
1969 lcp_echo_number = 0;
1970 lcp_echo_timer_running = 0;
1972 /* If a timeout interval is specified then start the timer */
1973 if (lcp_echo_interval != 0)
1978 * lcp_echo_lowerdown - Stop the timer for the LCP frame
1981 static void lcp_echo_lowerdown (int unit)
1983 fsm *f = &lcp_fsm[unit];
1985 if (lcp_echo_timer_running != 0) {
1986 UNTIMEOUT (LcpEchoTimeout, f);
1987 lcp_echo_timer_running = 0;
1991 #endif /* PPP_SUPPORT */