2 * lcp.c - PPP Link Control Protocol.
4 * Copyright (c) 1989 Carnegie Mellon University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University. The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 #define RCSID "$Id: lcp.c,v 1.50 2000/04/05 00:58:28 paulus Exp $";
36 static const char rcsid[] = RCSID;
39 * LCP-related command-line options.
41 int lcp_echo_interval = 0; /* Interval between LCP echo-requests */
42 int lcp_echo_fails = 0; /* Tolerance to unanswered echo-requests */
43 bool lax_recv = 0; /* accept control chars in asyncmap */
45 static int setescape __P((char **));
48 bool noendpoint = 0; /* don't send/accept endpoint discriminator */
49 static int setendpoint __P((char **));
50 #endif /* HAVE_MULTILINK */
52 static option_t lcp_option_list[] = {
54 { "noaccomp", o_bool, &lcp_wantoptions[0].neg_accompression,
55 "Disable address/control compression",
56 OPT_A2COPY, &lcp_allowoptions[0].neg_accompression },
57 { "-ac", o_bool, &lcp_wantoptions[0].neg_accompression,
58 "Disable address/control compression",
59 OPT_A2COPY, &lcp_allowoptions[0].neg_accompression },
60 { "default-asyncmap", o_bool, &lcp_wantoptions[0].neg_asyncmap,
61 "Disable asyncmap negotiation",
62 OPT_A2COPY, &lcp_allowoptions[0].neg_asyncmap },
63 { "-am", o_bool, &lcp_wantoptions[0].neg_asyncmap,
64 "Disable asyncmap negotiation",
65 OPT_A2COPY, &lcp_allowoptions[0].neg_asyncmap },
66 { "asyncmap", o_uint32, &lcp_wantoptions[0].asyncmap,
67 "Set asyncmap (for received packets)",
68 OPT_OR, &lcp_wantoptions[0].neg_asyncmap },
69 { "-as", o_uint32, &lcp_wantoptions[0].asyncmap,
70 "Set asyncmap (for received packets)",
71 OPT_OR, &lcp_wantoptions[0].neg_asyncmap },
72 { "nomagic", o_bool, &lcp_wantoptions[0].neg_magicnumber,
73 "Disable magic number negotiation (looped-back line detection)",
74 OPT_A2COPY, &lcp_allowoptions[0].neg_magicnumber },
75 { "-mn", o_bool, &lcp_wantoptions[0].neg_magicnumber,
76 "Disable magic number negotiation (looped-back line detection)",
77 OPT_A2COPY, &lcp_allowoptions[0].neg_magicnumber },
78 { "default-mru", o_bool, &lcp_wantoptions[0].neg_mru,
79 "Disable MRU negotiation (use default 1500)",
80 OPT_A2COPY, &lcp_allowoptions[0].neg_mru },
81 { "-mru", o_bool, &lcp_wantoptions[0].neg_mru,
82 "Disable MRU negotiation (use default 1500)",
83 OPT_A2COPY, &lcp_allowoptions[0].neg_mru },
84 { "mru", o_int, &lcp_wantoptions[0].mru,
85 "Set MRU (maximum received packet size) for negotiation",
86 0, &lcp_wantoptions[0].neg_mru },
87 { "nopcomp", o_bool, &lcp_wantoptions[0].neg_pcompression,
88 "Disable protocol field compression",
89 OPT_A2COPY, &lcp_allowoptions[0].neg_pcompression },
90 { "-pc", o_bool, &lcp_wantoptions[0].neg_pcompression,
91 "Disable protocol field compression",
92 OPT_A2COPY, &lcp_allowoptions[0].neg_pcompression },
93 { "-p", o_bool, &lcp_wantoptions[0].passive,
94 "Set passive mode", 1 },
95 { "passive", o_bool, &lcp_wantoptions[0].passive,
96 "Set passive mode", 1 },
97 { "silent", o_bool, &lcp_wantoptions[0].silent,
98 "Set silent mode", 1 },
99 { "escape", o_special, setescape,
100 "List of character codes to escape on transmission" },
101 { "lcp-echo-failure", o_int, &lcp_echo_fails,
102 "Set number of consecutive echo failures to indicate link failure" },
103 { "lcp-echo-interval", o_int, &lcp_echo_interval,
104 "Set time in seconds between LCP echo requests" },
105 { "lcp-restart", o_int, &lcp_fsm[0].timeouttime,
106 "Set time in seconds between LCP retransmissions" },
107 { "lcp-max-terminate", o_int, &lcp_fsm[0].maxtermtransmits,
108 "Set maximum number of LCP terminate-request transmissions" },
109 { "lcp-max-configure", o_int, &lcp_fsm[0].maxconfreqtransmits,
110 "Set maximum number of LCP configure-request transmissions" },
111 { "lcp-max-failure", o_int, &lcp_fsm[0].maxnakloops,
112 "Set limit on number of LCP configure-naks" },
113 { "receive-all", o_bool, &lax_recv,
114 "Accept all received control characters", 1 },
115 #ifdef HAVE_MULTILINK
116 { "mrru", o_int, &lcp_wantoptions[0].mrru,
117 "Maximum received packet size for multilink bundle",
118 0, &lcp_wantoptions[0].neg_mrru },
119 { "mpshortseq", o_bool, &lcp_wantoptions[0].neg_ssnhf,
120 "Use short sequence numbers in multilink headers",
121 OPT_A2COPY | 1, &lcp_allowoptions[0].neg_ssnhf },
122 { "nompshortseq", o_bool, &lcp_wantoptions[0].neg_ssnhf,
123 "Don't use short sequence numbers in multilink headers",
124 OPT_A2COPY, &lcp_allowoptions[0].neg_ssnhf },
125 { "endpoint", o_special, setendpoint,
126 "Endpoint discriminator for multilink" },
127 { "noendpoint", o_bool, &noendpoint,
128 "Don't send or accept multilink endpoint discriminator", 1 },
129 #endif /* HAVE_MULTILINK */
134 fsm lcp_fsm[NUM_PPP]; /* LCP fsm structure (global)*/
135 lcp_options lcp_wantoptions[NUM_PPP]; /* Options that we want to request */
136 lcp_options lcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
137 lcp_options lcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
138 lcp_options lcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
139 u_int32_t xmit_accm[NUM_PPP][8]; /* extended transmit ACCM */
141 static int lcp_echos_pending = 0; /* Number of outstanding echo msgs */
142 static int lcp_echo_number = 0; /* ID number of next echo frame */
143 static int lcp_echo_timer_running = 0; /* set if a timer is running */
145 static u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */
148 * Callbacks for fsm code. (CI = Configuration Information)
150 static void lcp_resetci __P((fsm *)); /* Reset our CI */
151 static int lcp_cilen __P((fsm *)); /* Return length of our CI */
152 static void lcp_addci __P((fsm *, u_char *, int *)); /* Add our CI to pkt */
153 static int lcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
154 static int lcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */
155 static int lcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
156 static int lcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv peer CI */
157 static void lcp_up __P((fsm *)); /* We're UP */
158 static void lcp_down __P((fsm *)); /* We're DOWN */
159 static void lcp_starting __P((fsm *)); /* We need lower layer up */
160 static void lcp_finished __P((fsm *)); /* We need lower layer down */
161 static int lcp_extcode __P((fsm *, int, int, u_char *, int));
162 static void lcp_rprotrej __P((fsm *, u_char *, int));
165 * routines to send LCP echos to peer
168 static void lcp_echo_lowerup __P((int));
169 static void lcp_echo_lowerdown __P((int));
170 static void LcpEchoTimeout __P((void *));
171 static void lcp_received_echo_reply __P((fsm *, int, u_char *, int));
172 static void LcpSendEchoRequest __P((fsm *));
173 static void LcpLinkFailure __P((fsm *));
174 static void LcpEchoCheck __P((fsm *));
176 static fsm_callbacks lcp_callbacks = { /* LCP callback routines */
177 lcp_resetci, /* Reset our Configuration Information */
178 lcp_cilen, /* Length of our Configuration Information */
179 lcp_addci, /* Add our Configuration Information */
180 lcp_ackci, /* ACK our Configuration Information */
181 lcp_nakci, /* NAK our Configuration Information */
182 lcp_rejci, /* Reject our Configuration Information */
183 lcp_reqci, /* Request peer's Configuration Information */
184 lcp_up, /* Called when fsm reaches OPENED state */
185 lcp_down, /* Called when fsm leaves OPENED state */
186 lcp_starting, /* Called when we want the lower layer up */
187 lcp_finished, /* Called when we want the lower layer down */
188 NULL, /* Called when Protocol-Reject received */
189 NULL, /* Retransmission is necessary */
190 lcp_extcode, /* Called to handle LCP-specific codes */
191 "LCP" /* String name of protocol */
195 * Protocol entry points.
196 * Some of these are called directly.
199 static void lcp_init __P((int));
200 static void lcp_input __P((int, u_char *, int));
201 static void lcp_protrej __P((int));
202 static int lcp_printpkt __P((u_char *, int,
203 void (*) __P((void *, char *, ...)), void *));
205 struct protent lcp_protent = {
225 int lcp_loopbackfail = DEFLOOPBACKFAIL;
228 * Length of each type of configuration option (in octets)
232 #define CILEN_SHORT 4 /* CILEN_VOID + 2 */
233 #define CILEN_CHAP 5 /* CILEN_VOID + 2 + 1 */
234 #define CILEN_LONG 6 /* CILEN_VOID + 4 */
235 #define CILEN_LQR 8 /* CILEN_VOID + 2 + 4 */
238 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
239 (x) == CONFNAK ? "NAK" : "REJ")
243 * setescape - add chars to the set we escape on transmission.
255 n = strtol(p, &endp, 16);
257 option_error("escape parameter contains invalid hex number '%s'",
262 if (n < 0 || n == 0x5E || n > 0xFF) {
263 option_error("can't escape character 0x%x", n);
266 xmit_accm[0][n >> 5] |= 1 << (n & 0x1F);
267 while (*p == ',' || *p == ' ')
273 #ifdef HAVE_MULTILINK
278 if (str_to_epdisc(&lcp_wantoptions[0].endpoint, *argv)) {
279 lcp_wantoptions[0].neg_endpoint = 1;
282 option_error("Can't parse '%s' as an endpoint discriminator", *argv);
285 #endif /* HAVE_MULTILINK */
288 * lcp_init - Initialize LCP.
294 fsm *f = &lcp_fsm[unit];
295 lcp_options *wo = &lcp_wantoptions[unit];
296 lcp_options *ao = &lcp_allowoptions[unit];
299 f->protocol = PPP_LCP;
300 f->callbacks = &lcp_callbacks;
304 BZERO(wo, sizeof(*wo));
307 wo->neg_asyncmap = 1;
308 wo->chap_mdtype = CHAP_DIGEST_MD5;
309 wo->neg_magicnumber = 1;
310 wo->neg_pcompression = 1;
311 wo->neg_accompression = 1;
313 BZERO(ao, sizeof(*ao));
316 ao->neg_asyncmap = 1;
318 ao->chap_mdtype = CHAP_DIGEST_MD5;
320 ao->neg_magicnumber = 1;
321 ao->neg_pcompression = 1;
322 ao->neg_accompression = 1;
326 #ifdef HAVE_MULTILINK
327 ao->neg_endpoint = 1;
330 BZERO(xmit_accm[unit], sizeof(xmit_accm[0]));
331 xmit_accm[unit][3] = 0x60000000;
336 * lcp_open - LCP is allowed to come up.
342 fsm *f = &lcp_fsm[unit];
343 lcp_options *wo = &lcp_wantoptions[unit];
347 f->flags |= OPT_PASSIVE;
349 f->flags |= OPT_SILENT;
355 * lcp_close - Take LCP down.
358 lcp_close(unit, reason)
362 fsm *f = &lcp_fsm[unit];
364 if (phase != PHASE_DEAD)
365 new_phase(PHASE_TERMINATE);
366 if (f->state == STOPPED && f->flags & (OPT_PASSIVE|OPT_SILENT)) {
368 * This action is not strictly according to the FSM in RFC1548,
369 * but it does mean that the program terminates if you do a
370 * lcp_close() in passive/silent mode when a connection hasn't
377 fsm_close(&lcp_fsm[unit], reason);
382 * lcp_lowerup - The lower layer is up.
388 lcp_options *wo = &lcp_wantoptions[unit];
391 * Don't use A/C or protocol compression on transmission,
392 * but accept A/C and protocol compressed packets
393 * if we are going to ask for A/C and protocol compression.
395 ppp_set_xaccm(unit, xmit_accm[unit]);
396 ppp_send_config(unit, PPP_MRU, 0xffffffff, 0, 0);
397 ppp_recv_config(unit, PPP_MRU, (lax_recv? 0: 0xffffffff),
398 wo->neg_pcompression, wo->neg_accompression);
399 peer_mru[unit] = PPP_MRU;
400 lcp_allowoptions[unit].asyncmap = xmit_accm[unit][0];
402 fsm_lowerup(&lcp_fsm[unit]);
407 * lcp_lowerdown - The lower layer is down.
413 fsm_lowerdown(&lcp_fsm[unit]);
418 * lcp_input - Input LCP packet.
421 lcp_input(unit, p, len)
426 fsm *f = &lcp_fsm[unit];
428 fsm_input(f, p, len);
433 * lcp_extcode - Handle a LCP-specific code.
436 lcp_extcode(f, code, id, inp, len)
446 lcp_rprotrej(f, inp, len);
450 if (f->state != OPENED)
453 PUTLONG(lcp_gotoptions[f->unit].magicnumber, magp);
454 fsm_sdata(f, ECHOREP, id, inp, len);
458 lcp_received_echo_reply(f, id, inp, len);
472 * lcp_rprotrej - Receive an Protocol-Reject.
474 * Figure out which protocol is rejected and inform it.
477 lcp_rprotrej(f, inp, len)
483 struct protent *protp;
487 LCPDEBUG(("lcp_rprotrej: Rcvd short Protocol-Reject packet!"));
494 * Protocol-Reject packets received in any state other than the LCP
495 * OPENED state SHOULD be silently discarded.
497 if( f->state != OPENED ){
498 LCPDEBUG(("Protocol-Reject discarded: LCP in state %d", f->state));
503 * Upcall the proper Protocol-Reject routine.
505 for (i = 0; (protp = protocols[i]) != NULL; ++i)
506 if (protp->protocol == prot && protp->enabled_flag) {
507 (*protp->protrej)(f->unit);
511 warn("Protocol-Reject for unsupported protocol 0x%x", prot);
516 * lcp_protrej - A Protocol-Reject was received.
526 error("Received Protocol-Reject for LCP!");
527 fsm_protreject(&lcp_fsm[unit]);
532 * lcp_sprotrej - Send a Protocol-Reject for some protocol.
535 lcp_sprotrej(unit, p, len)
541 * Send back the protocol and the information field of the
542 * rejected packet. We only get here if LCP is in the OPENED state.
547 fsm_sdata(&lcp_fsm[unit], PROTREJ, ++lcp_fsm[unit].id,
553 * lcp_resetci - Reset our CI.
559 lcp_options *wo = &lcp_wantoptions[f->unit];
560 lcp_options *go = &lcp_gotoptions[f->unit];
562 wo->magicnumber = magic();
568 go->neg_endpoint = 0;
570 peer_mru[f->unit] = PPP_MRU;
576 * lcp_cilen - Return length of our CI.
582 lcp_options *go = &lcp_gotoptions[f->unit];
584 #define LENCIVOID(neg) ((neg) ? CILEN_VOID : 0)
585 #define LENCICHAP(neg) ((neg) ? CILEN_CHAP : 0)
586 #define LENCISHORT(neg) ((neg) ? CILEN_SHORT : 0)
587 #define LENCILONG(neg) ((neg) ? CILEN_LONG : 0)
588 #define LENCILQR(neg) ((neg) ? CILEN_LQR: 0)
589 #define LENCICBCP(neg) ((neg) ? CILEN_CBCP: 0)
591 * NB: we only ask for one of CHAP and UPAP, even if we will
594 return (LENCISHORT(go->neg_mru && go->mru != DEFMRU) +
595 LENCILONG(go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF) +
596 LENCICHAP(go->neg_chap) +
597 LENCISHORT(!go->neg_chap && go->neg_upap) +
598 LENCILQR(go->neg_lqr) +
599 LENCICBCP(go->neg_cbcp) +
600 LENCILONG(go->neg_magicnumber) +
601 LENCIVOID(go->neg_pcompression) +
602 LENCIVOID(go->neg_accompression) +
603 LENCISHORT(go->neg_mrru) +
604 LENCIVOID(go->neg_ssnhf) +
605 (go->neg_endpoint? CILEN_CHAR + go->endpoint.length: 0));
610 * lcp_addci - Add our desired CIs to a packet.
613 lcp_addci(f, ucp, lenp)
618 lcp_options *go = &lcp_gotoptions[f->unit];
619 u_char *start_ucp = ucp;
621 #define ADDCIVOID(opt, neg) \
624 PUTCHAR(CILEN_VOID, ucp); \
626 #define ADDCISHORT(opt, neg, val) \
629 PUTCHAR(CILEN_SHORT, ucp); \
630 PUTSHORT(val, ucp); \
632 #define ADDCICHAP(opt, neg, val, digest) \
635 PUTCHAR(CILEN_CHAP, ucp); \
636 PUTSHORT(val, ucp); \
637 PUTCHAR(digest, ucp); \
639 #define ADDCILONG(opt, neg, val) \
642 PUTCHAR(CILEN_LONG, ucp); \
645 #define ADDCILQR(opt, neg, val) \
648 PUTCHAR(CILEN_LQR, ucp); \
649 PUTSHORT(PPP_LQR, ucp); \
652 #define ADDCICHAR(opt, neg, val) \
655 PUTCHAR(CILEN_CHAR, ucp); \
658 #define ADDCIENDP(opt, neg, class, val, len) \
662 PUTCHAR(CILEN_CHAR + len, ucp); \
663 PUTCHAR(class, ucp); \
664 for (i = 0; i < len; ++i) \
665 PUTCHAR(val[i], ucp); \
668 ADDCISHORT(CI_MRU, go->neg_mru && go->mru != DEFMRU, go->mru);
669 ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF,
671 ADDCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype);
672 ADDCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
673 ADDCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
674 ADDCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
675 ADDCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
676 ADDCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
677 ADDCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
678 ADDCISHORT(CI_MRRU, go->neg_mrru, go->mrru);
679 ADDCIVOID(CI_SSNHF, go->neg_ssnhf);
680 ADDCIENDP(CI_EPDISC, go->neg_endpoint, go->endpoint.class,
681 go->endpoint.value, go->endpoint.length);
683 if (ucp - start_ucp != *lenp) {
684 /* this should never happen, because peer_mtu should be 1500 */
685 error("Bug in lcp_addci: wrong length");
691 * lcp_ackci - Ack our CIs.
692 * This should not modify any state if the Ack is bad.
704 lcp_options *go = &lcp_gotoptions[f->unit];
705 u_char cilen, citype, cichar;
710 * CIs must be in exactly the same order that we sent.
711 * Check packet length and CI length at each step.
712 * If we find any deviations, then this packet is bad.
714 #define ACKCIVOID(opt, neg) \
716 if ((len -= CILEN_VOID) < 0) \
718 GETCHAR(citype, p); \
720 if (cilen != CILEN_VOID || \
724 #define ACKCISHORT(opt, neg, val) \
726 if ((len -= CILEN_SHORT) < 0) \
728 GETCHAR(citype, p); \
730 if (cilen != CILEN_SHORT || \
733 GETSHORT(cishort, p); \
734 if (cishort != val) \
737 #define ACKCICHAR(opt, neg, val) \
739 if ((len -= CILEN_CHAR) < 0) \
741 GETCHAR(citype, p); \
743 if (cilen != CILEN_CHAR || \
746 GETCHAR(cichar, p); \
750 #define ACKCICHAP(opt, neg, val, digest) \
752 if ((len -= CILEN_CHAP) < 0) \
754 GETCHAR(citype, p); \
756 if (cilen != CILEN_CHAP || \
759 GETSHORT(cishort, p); \
760 if (cishort != val) \
762 GETCHAR(cichar, p); \
763 if (cichar != digest) \
766 #define ACKCILONG(opt, neg, val) \
768 if ((len -= CILEN_LONG) < 0) \
770 GETCHAR(citype, p); \
772 if (cilen != CILEN_LONG || \
775 GETLONG(cilong, p); \
779 #define ACKCILQR(opt, neg, val) \
781 if ((len -= CILEN_LQR) < 0) \
783 GETCHAR(citype, p); \
785 if (cilen != CILEN_LQR || \
788 GETSHORT(cishort, p); \
789 if (cishort != PPP_LQR) \
791 GETLONG(cilong, p); \
795 #define ACKCIENDP(opt, neg, class, val, vlen) \
798 if ((len -= CILEN_CHAR + vlen) < 0) \
800 GETCHAR(citype, p); \
802 if (cilen != CILEN_CHAR + vlen || \
805 GETCHAR(cichar, p); \
806 if (cichar != class) \
808 for (i = 0; i < vlen; ++i) { \
809 GETCHAR(cichar, p); \
810 if (cichar != val[i]) \
815 ACKCISHORT(CI_MRU, go->neg_mru && go->mru != DEFMRU, go->mru);
816 ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF,
818 ACKCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype);
819 ACKCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
820 ACKCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
821 ACKCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
822 ACKCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
823 ACKCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
824 ACKCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
825 ACKCISHORT(CI_MRRU, go->neg_mrru, go->mrru);
826 ACKCIVOID(CI_SSNHF, go->neg_ssnhf);
827 ACKCIENDP(CI_EPDISC, go->neg_endpoint, go->endpoint.class,
828 go->endpoint.value, go->endpoint.length);
831 * If there are any remaining CIs, then this packet is bad.
837 LCPDEBUG(("lcp_acki: received bad Ack!"));
843 * lcp_nakci - Peer has sent a NAK for some of our CIs.
844 * This should not modify any state if the Nak is bad
845 * or if LCP is in the OPENED state.
857 lcp_options *go = &lcp_gotoptions[f->unit];
858 lcp_options *wo = &lcp_wantoptions[f->unit];
859 u_char citype, cichar, *next;
862 lcp_options no; /* options we've seen Naks for */
863 lcp_options try; /* options to request next time */
867 BZERO(&no, sizeof(no));
871 * Any Nak'd CIs must be in exactly the same order that we sent.
872 * Check packet length and CI length at each step.
873 * If we find any deviations, then this packet is bad.
875 #define NAKCIVOID(opt, neg) \
877 len >= CILEN_VOID && \
878 p[1] == CILEN_VOID && \
881 INCPTR(CILEN_VOID, p); \
885 #define NAKCICHAP(opt, neg, code) \
887 len >= CILEN_CHAP && \
888 p[1] == CILEN_CHAP && \
892 GETSHORT(cishort, p); \
893 GETCHAR(cichar, p); \
897 #define NAKCICHAR(opt, neg, code) \
899 len >= CILEN_CHAR && \
900 p[1] == CILEN_CHAR && \
904 GETCHAR(cichar, p); \
908 #define NAKCISHORT(opt, neg, code) \
910 len >= CILEN_SHORT && \
911 p[1] == CILEN_SHORT && \
913 len -= CILEN_SHORT; \
915 GETSHORT(cishort, p); \
919 #define NAKCILONG(opt, neg, code) \
921 len >= CILEN_LONG && \
922 p[1] == CILEN_LONG && \
926 GETLONG(cilong, p); \
930 #define NAKCILQR(opt, neg, code) \
932 len >= CILEN_LQR && \
933 p[1] == CILEN_LQR && \
937 GETSHORT(cishort, p); \
938 GETLONG(cilong, p); \
942 #define NAKCIENDP(opt, neg) \
944 len >= CILEN_CHAR && \
946 p[1] >= CILEN_CHAR && \
955 * We don't care if they want to send us smaller packets than
956 * we want. Therefore, accept any MRU less than what we asked for,
957 * but then ignore the new value when setting the MRU in the kernel.
958 * If they send us a bigger MRU than what we asked, accept it, up to
959 * the limit of the default MRU we'd get if we didn't negotiate.
961 if (go->neg_mru && go->mru != DEFMRU) {
962 NAKCISHORT(CI_MRU, neg_mru,
963 if (cishort <= wo->mru || cishort <= DEFMRU)
969 * Add any characters they want to our (receive-side) asyncmap.
971 if (go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF) {
972 NAKCILONG(CI_ASYNCMAP, neg_asyncmap,
973 try.asyncmap = go->asyncmap | cilong;
978 * If they've nak'd our authentication-protocol, check whether
979 * they are proposing a different protocol, or a different
980 * hash algorithm for CHAP.
982 if ((go->neg_chap || go->neg_upap)
983 && len >= CILEN_SHORT
984 && p[0] == CI_AUTHTYPE && p[1] >= CILEN_SHORT && p[1] <= len) {
987 no.neg_chap = go->neg_chap;
988 no.neg_upap = go->neg_upap;
990 GETSHORT(cishort, p);
991 if (cishort == PPP_PAP && cilen == CILEN_SHORT) {
993 * If we were asking for CHAP, they obviously don't want to do it.
994 * If we weren't asking for CHAP, then we were asking for PAP,
995 * in which case this Nak is bad.
1001 } else if (cishort == PPP_CHAP && cilen == CILEN_CHAP) {
1005 * We were asking for CHAP/MD5; they must want a different
1006 * algorithm. If they can't do MD5, we can ask for M$-CHAP
1007 * if we support it, otherwise we'll have to stop
1010 if (cichar != go->chap_mdtype) {
1012 if (cichar == CHAP_MICROSOFT)
1013 go->chap_mdtype = CHAP_MICROSOFT;
1020 * Stop asking for PAP if we were asking for it.
1027 * We don't recognize what they're suggesting.
1028 * Stop asking for what we were asking for.
1034 p += cilen - CILEN_SHORT;
1039 * If they can't cope with our link quality protocol, we'll have
1040 * to stop asking for LQR. We haven't got any other protocol.
1041 * If they Nak the reporting period, take their value XXX ?
1043 NAKCILQR(CI_QUALITY, neg_lqr,
1044 if (cishort != PPP_LQR)
1047 try.lqr_period = cilong;
1051 * Only implementing CBCP...not the rest of the callback options
1053 NAKCICHAR(CI_CALLBACK, neg_cbcp,
1058 * Check for a looped-back line.
1060 NAKCILONG(CI_MAGICNUMBER, neg_magicnumber,
1061 try.magicnumber = magic();
1066 * Peer shouldn't send Nak for protocol compression or
1067 * address/control compression requests; they should send
1068 * a Reject instead. If they send a Nak, treat it as a Reject.
1070 NAKCIVOID(CI_PCOMPRESSION, neg_pcompression);
1071 NAKCIVOID(CI_ACCOMPRESSION, neg_accompression);
1074 * Nak for MRRU option - accept their value if it is smaller
1075 * than the one we want.
1078 NAKCISHORT(CI_MRRU, neg_mrru,
1079 if (cishort <= wo->mrru)
1085 * Nak for short sequence numbers shouldn't be sent, treat it
1088 NAKCIVOID(CI_SSNHF, neg_ssnhf);
1091 * Nak of the endpoint discriminator option is not permitted,
1092 * treat it like a reject.
1094 NAKCIENDP(CI_EPDISC, neg_endpoint);
1097 * There may be remaining CIs, if the peer is requesting negotiation
1098 * on an option that we didn't include in our request packet.
1099 * If we see an option that we requested, or one we've already seen
1100 * in this packet, then this packet is bad.
1101 * If we wanted to respond by starting to negotiate on the requested
1102 * option(s), we could, but we don't, because except for the
1103 * authentication type and quality protocol, if we are not negotiating
1104 * an option, it is because we were told not to.
1105 * For the authentication type, the Nak from the peer means
1106 * `let me authenticate myself with you' which is a bit pointless.
1107 * For the quality protocol, the Nak means `ask me to send you quality
1108 * reports', but if we didn't ask for them, we don't want them.
1109 * An option we don't recognize represents the peer asking to
1110 * negotiate some option we don't support, so ignore it.
1112 while (len > CILEN_VOID) {
1115 if (cilen < CILEN_VOID || (len -= cilen) < 0)
1117 next = p + cilen - 2;
1121 if ((go->neg_mru && go->mru != DEFMRU)
1122 || no.neg_mru || cilen != CILEN_SHORT)
1124 GETSHORT(cishort, p);
1125 if (cishort < DEFMRU) {
1131 if ((go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF)
1132 || no.neg_asyncmap || cilen != CILEN_LONG)
1136 if (go->neg_chap || no.neg_chap || go->neg_upap || no.neg_upap)
1139 case CI_MAGICNUMBER:
1140 if (go->neg_magicnumber || no.neg_magicnumber ||
1141 cilen != CILEN_LONG)
1144 case CI_PCOMPRESSION:
1145 if (go->neg_pcompression || no.neg_pcompression
1146 || cilen != CILEN_VOID)
1149 case CI_ACCOMPRESSION:
1150 if (go->neg_accompression || no.neg_accompression
1151 || cilen != CILEN_VOID)
1155 if (go->neg_lqr || no.neg_lqr || cilen != CILEN_LQR)
1159 if (go->neg_mrru || no.neg_mrru || cilen != CILEN_SHORT)
1163 if (go->neg_ssnhf || no.neg_ssnhf || cilen != CILEN_VOID)
1168 if (go->neg_endpoint || no.neg_endpoint || cilen < CILEN_CHAR)
1176 * OK, the Nak is good. Now we can update state.
1177 * If there are any options left we ignore them.
1179 if (f->state != OPENED) {
1181 if (++try.numloops >= lcp_loopbackfail) {
1182 notice("Serial line is looped back.");
1183 lcp_close(f->unit, "Loopback detected");
1184 status = EXIT_LOOPBACK;
1194 LCPDEBUG(("lcp_nakci: received bad Nak!"));
1200 * lcp_rejci - Peer has Rejected some of our CIs.
1201 * This should not modify any state if the Reject is bad
1202 * or if LCP is in the OPENED state.
1205 * 0 - Reject was bad.
1206 * 1 - Reject was good.
1209 lcp_rejci(f, p, len)
1214 lcp_options *go = &lcp_gotoptions[f->unit];
1218 lcp_options try; /* options to request next time */
1223 * Any Rejected CIs must be in exactly the same order that we sent.
1224 * Check packet length and CI length at each step.
1225 * If we find any deviations, then this packet is bad.
1227 #define REJCIVOID(opt, neg) \
1229 len >= CILEN_VOID && \
1230 p[1] == CILEN_VOID && \
1232 len -= CILEN_VOID; \
1233 INCPTR(CILEN_VOID, p); \
1236 #define REJCISHORT(opt, neg, val) \
1238 len >= CILEN_SHORT && \
1239 p[1] == CILEN_SHORT && \
1241 len -= CILEN_SHORT; \
1243 GETSHORT(cishort, p); \
1244 /* Check rejected value. */ \
1245 if (cishort != val) \
1249 #define REJCICHAP(opt, neg, val, digest) \
1251 len >= CILEN_CHAP && \
1252 p[1] == CILEN_CHAP && \
1254 len -= CILEN_CHAP; \
1256 GETSHORT(cishort, p); \
1257 GETCHAR(cichar, p); \
1258 /* Check rejected value. */ \
1259 if (cishort != val || cichar != digest) \
1264 #define REJCILONG(opt, neg, val) \
1266 len >= CILEN_LONG && \
1267 p[1] == CILEN_LONG && \
1269 len -= CILEN_LONG; \
1271 GETLONG(cilong, p); \
1272 /* Check rejected value. */ \
1273 if (cilong != val) \
1277 #define REJCILQR(opt, neg, val) \
1279 len >= CILEN_LQR && \
1280 p[1] == CILEN_LQR && \
1284 GETSHORT(cishort, p); \
1285 GETLONG(cilong, p); \
1286 /* Check rejected value. */ \
1287 if (cishort != PPP_LQR || cilong != val) \
1291 #define REJCICBCP(opt, neg, val) \
1293 len >= CILEN_CBCP && \
1294 p[1] == CILEN_CBCP && \
1296 len -= CILEN_CBCP; \
1298 GETCHAR(cichar, p); \
1299 /* Check rejected value. */ \
1300 if (cichar != val) \
1304 #define REJCIENDP(opt, neg, class, val, vlen) \
1306 len >= CILEN_CHAR + vlen && \
1308 p[1] == CILEN_CHAR + vlen) { \
1310 len -= CILEN_CHAR + vlen; \
1312 GETCHAR(cichar, p); \
1313 if (cichar != class) \
1315 for (i = 0; i < vlen; ++i) { \
1316 GETCHAR(cichar, p); \
1317 if (cichar != val[i]) \
1323 REJCISHORT(CI_MRU, neg_mru, go->mru);
1324 REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap);
1325 REJCICHAP(CI_AUTHTYPE, neg_chap, PPP_CHAP, go->chap_mdtype);
1326 if (!go->neg_chap) {
1327 REJCISHORT(CI_AUTHTYPE, neg_upap, PPP_PAP);
1329 REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period);
1330 REJCICBCP(CI_CALLBACK, neg_cbcp, CBCP_OPT);
1331 REJCILONG(CI_MAGICNUMBER, neg_magicnumber, go->magicnumber);
1332 REJCIVOID(CI_PCOMPRESSION, neg_pcompression);
1333 REJCIVOID(CI_ACCOMPRESSION, neg_accompression);
1334 REJCISHORT(CI_MRRU, neg_mrru, go->mrru);
1335 REJCIVOID(CI_SSNHF, neg_ssnhf);
1336 REJCIENDP(CI_EPDISC, neg_endpoint, go->endpoint.class,
1337 go->endpoint.value, go->endpoint.length);
1340 * If there are any remaining CIs, then this packet is bad.
1345 * Now we can update state.
1347 if (f->state != OPENED)
1352 LCPDEBUG(("lcp_rejci: received bad Reject!"));
1358 * lcp_reqci - Check the peer's requested CIs and send appropriate response.
1360 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1361 * appropriately. If reject_if_disagree is non-zero, doesn't return
1362 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1365 lcp_reqci(f, inp, lenp, reject_if_disagree)
1367 u_char *inp; /* Requested CIs */
1368 int *lenp; /* Length of requested CIs */
1369 int reject_if_disagree;
1371 lcp_options *go = &lcp_gotoptions[f->unit];
1372 lcp_options *ho = &lcp_hisoptions[f->unit];
1373 lcp_options *ao = &lcp_allowoptions[f->unit];
1374 u_char *cip, *next; /* Pointer to current and next CIs */
1375 int cilen, citype, cichar; /* Parsed len, type, char value */
1376 u_short cishort; /* Parsed short value */
1377 u_int32_t cilong; /* Parse long value */
1378 int rc = CONFACK; /* Final packet return code */
1379 int orc; /* Individual option return code */
1380 u_char *p; /* Pointer to next char to parse */
1381 u_char *rejp; /* Pointer to next char in reject frame */
1382 u_char *nakp; /* Pointer to next char in Nak frame */
1383 int l = *lenp; /* Length left */
1386 * Reset all his options.
1388 BZERO(ho, sizeof(*ho));
1391 * Process all his options.
1397 orc = CONFACK; /* Assume success */
1398 cip = p = next; /* Remember begining of CI */
1399 if (l < 2 || /* Not enough data for CI header or */
1400 p[1] < 2 || /* CI length too small or */
1401 p[1] > l) { /* CI length too big? */
1402 LCPDEBUG(("lcp_reqci: bad CI length!"));
1403 orc = CONFREJ; /* Reject bad CI */
1404 cilen = l; /* Reject till end of packet */
1405 l = 0; /* Don't loop again */
1409 GETCHAR(citype, p); /* Parse CI type */
1410 GETCHAR(cilen, p); /* Parse CI length */
1411 l -= cilen; /* Adjust remaining length */
1412 next += cilen; /* Step to next CI */
1414 switch (citype) { /* Check CI type */
1416 if (!ao->neg_mru || /* Allow option? */
1417 cilen != CILEN_SHORT) { /* Check CI length */
1418 orc = CONFREJ; /* Reject CI */
1421 GETSHORT(cishort, p); /* Parse MRU */
1424 * He must be able to receive at least our minimum.
1425 * No need to check a maximum. If he sends a large number,
1426 * we'll just ignore it.
1428 if (cishort < MINMRU) {
1429 orc = CONFNAK; /* Nak CI */
1430 PUTCHAR(CI_MRU, nakp);
1431 PUTCHAR(CILEN_SHORT, nakp);
1432 PUTSHORT(MINMRU, nakp); /* Give him a hint */
1435 ho->neg_mru = 1; /* Remember he sent MRU */
1436 ho->mru = cishort; /* And remember value */
1440 if (!ao->neg_asyncmap ||
1441 cilen != CILEN_LONG) {
1448 * Asyncmap must have set at least the bits
1449 * which are set in lcp_allowoptions[unit].asyncmap.
1451 if ((ao->asyncmap & ~cilong) != 0) {
1453 PUTCHAR(CI_ASYNCMAP, nakp);
1454 PUTCHAR(CILEN_LONG, nakp);
1455 PUTLONG(ao->asyncmap | cilong, nakp);
1458 ho->neg_asyncmap = 1;
1459 ho->asyncmap = cilong;
1463 if (cilen < CILEN_SHORT ||
1464 !(ao->neg_upap || ao->neg_chap)) {
1466 * Reject the option if we're not willing to authenticate.
1471 GETSHORT(cishort, p);
1474 * Authtype must be PAP or CHAP.
1476 * Note: if both ao->neg_upap and ao->neg_chap are set,
1477 * and the peer sends a Configure-Request with two
1478 * authenticate-protocol requests, one for CHAP and one
1479 * for UPAP, then we will reject the second request.
1480 * Whether we end up doing CHAP or UPAP depends then on
1481 * the ordering of the CIs in the peer's Configure-Request.
1484 if (cishort == PPP_PAP) {
1485 if (ho->neg_chap || /* we've already accepted CHAP */
1486 cilen != CILEN_SHORT) {
1487 LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE PAP, rejecting..."));
1491 if (!ao->neg_upap) { /* we don't want to do PAP */
1492 orc = CONFNAK; /* NAK it and suggest CHAP */
1493 PUTCHAR(CI_AUTHTYPE, nakp);
1494 PUTCHAR(CILEN_CHAP, nakp);
1495 PUTSHORT(PPP_CHAP, nakp);
1496 PUTCHAR(ao->chap_mdtype, nakp);
1497 /* XXX if we can do CHAP_MICROSOFT as well, we should
1498 probably put in another option saying so */
1504 if (cishort == PPP_CHAP) {
1505 if (ho->neg_upap || /* we've already accepted PAP */
1506 cilen != CILEN_CHAP) {
1507 LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE CHAP, rejecting..."));
1511 if (!ao->neg_chap) { /* we don't want to do CHAP */
1512 orc = CONFNAK; /* NAK it and suggest PAP */
1513 PUTCHAR(CI_AUTHTYPE, nakp);
1514 PUTCHAR(CILEN_SHORT, nakp);
1515 PUTSHORT(PPP_PAP, nakp);
1518 GETCHAR(cichar, p); /* get digest type*/
1519 if (cichar != CHAP_DIGEST_MD5
1521 && cichar != CHAP_MICROSOFT
1525 PUTCHAR(CI_AUTHTYPE, nakp);
1526 PUTCHAR(CILEN_CHAP, nakp);
1527 PUTSHORT(PPP_CHAP, nakp);
1528 PUTCHAR(ao->chap_mdtype, nakp);
1531 ho->chap_mdtype = cichar; /* save md type */
1537 * We don't recognize the protocol they're asking for.
1538 * Nak it with something we're willing to do.
1539 * (At this point we know ao->neg_upap || ao->neg_chap.)
1542 PUTCHAR(CI_AUTHTYPE, nakp);
1544 PUTCHAR(CILEN_CHAP, nakp);
1545 PUTSHORT(PPP_CHAP, nakp);
1546 PUTCHAR(ao->chap_mdtype, nakp);
1548 PUTCHAR(CILEN_SHORT, nakp);
1549 PUTSHORT(PPP_PAP, nakp);
1555 cilen != CILEN_LQR) {
1560 GETSHORT(cishort, p);
1564 * Check the protocol and the reporting period.
1565 * XXX When should we Nak this, and what with?
1567 if (cishort != PPP_LQR) {
1569 PUTCHAR(CI_QUALITY, nakp);
1570 PUTCHAR(CILEN_LQR, nakp);
1571 PUTSHORT(PPP_LQR, nakp);
1572 PUTLONG(ao->lqr_period, nakp);
1577 case CI_MAGICNUMBER:
1578 if (!(ao->neg_magicnumber || go->neg_magicnumber) ||
1579 cilen != CILEN_LONG) {
1586 * He must have a different magic number.
1588 if (go->neg_magicnumber &&
1589 cilong == go->magicnumber) {
1590 cilong = magic(); /* Don't put magic() inside macro! */
1592 PUTCHAR(CI_MAGICNUMBER, nakp);
1593 PUTCHAR(CILEN_LONG, nakp);
1594 PUTLONG(cilong, nakp);
1597 ho->neg_magicnumber = 1;
1598 ho->magicnumber = cilong;
1602 case CI_PCOMPRESSION:
1603 if (!ao->neg_pcompression ||
1604 cilen != CILEN_VOID) {
1608 ho->neg_pcompression = 1;
1611 case CI_ACCOMPRESSION:
1612 if (!ao->neg_accompression ||
1613 cilen != CILEN_VOID) {
1617 ho->neg_accompression = 1;
1621 if (!ao->neg_mrru || !multilink ||
1622 cilen != CILEN_SHORT) {
1627 GETSHORT(cishort, p);
1628 /* possibly should insist on a minimum/maximum MRRU here */
1634 if (!ao->neg_ssnhf || !multilink ||
1635 cilen != CILEN_VOID) {
1643 if (!ao->neg_endpoint || !multilink ||
1644 cilen < CILEN_CHAR ||
1645 cilen > CILEN_CHAR + MAX_ENDP_LEN) {
1650 cilen -= CILEN_CHAR;
1651 ho->neg_endpoint = 1;
1652 ho->endpoint.class = cichar;
1653 ho->endpoint.length = cilen;
1654 BCOPY(p, ho->endpoint.value, cilen);
1659 LCPDEBUG(("lcp_reqci: rcvd unknown option %d", citype));
1665 if (orc == CONFACK && /* Good CI */
1666 rc != CONFACK) /* but prior CI wasnt? */
1667 continue; /* Don't send this one */
1669 if (orc == CONFNAK) { /* Nak this CI? */
1670 if (reject_if_disagree /* Getting fed up with sending NAKs? */
1671 && citype != CI_MAGICNUMBER) {
1672 orc = CONFREJ; /* Get tough if so */
1674 if (rc == CONFREJ) /* Rejecting prior CI? */
1675 continue; /* Don't send this one */
1679 if (orc == CONFREJ) { /* Reject this CI */
1681 if (cip != rejp) /* Need to move rejected CI? */
1682 BCOPY(cip, rejp, cilen); /* Move it */
1683 INCPTR(cilen, rejp); /* Update output pointer */
1688 * If we wanted to send additional NAKs (for unsent CIs), the
1689 * code would go here. The extra NAKs would go at *nakp.
1690 * At present there are no cases where we want to ask the
1691 * peer to negotiate an option.
1700 * Copy the Nak'd options from the nak_buffer to the caller's buffer.
1702 *lenp = nakp - nak_buffer;
1703 BCOPY(nak_buffer, inp, *lenp);
1710 LCPDEBUG(("lcp_reqci: returning CONF%s.", CODENAME(rc)));
1711 return (rc); /* Return final code */
1716 * lcp_up - LCP has come UP.
1722 lcp_options *wo = &lcp_wantoptions[f->unit];
1723 lcp_options *ho = &lcp_hisoptions[f->unit];
1724 lcp_options *go = &lcp_gotoptions[f->unit];
1725 lcp_options *ao = &lcp_allowoptions[f->unit];
1727 if (!go->neg_magicnumber)
1728 go->magicnumber = 0;
1729 if (!ho->neg_magicnumber)
1730 ho->magicnumber = 0;
1733 * Set our MTU to the smaller of the MTU we wanted and
1734 * the MRU our peer wanted. If we negotiated an MRU,
1735 * set our MRU to the larger of value we wanted and
1736 * the value we got in the negotiation.
1738 ppp_send_config(f->unit, MIN(ao->mru, (ho->neg_mru? ho->mru: PPP_MRU)),
1739 (ho->neg_asyncmap? ho->asyncmap: 0xffffffff),
1740 ho->neg_pcompression, ho->neg_accompression);
1741 ppp_recv_config(f->unit, (go->neg_mru? MAX(wo->mru, go->mru): PPP_MRU),
1742 (lax_recv? 0: go->neg_asyncmap? go->asyncmap: 0xffffffff),
1743 go->neg_pcompression, go->neg_accompression);
1746 peer_mru[f->unit] = ho->mru;
1748 lcp_echo_lowerup(f->unit); /* Enable echo messages */
1750 link_established(f->unit);
1755 * lcp_down - LCP has gone DOWN.
1757 * Alert other protocols.
1763 lcp_options *go = &lcp_gotoptions[f->unit];
1765 lcp_echo_lowerdown(f->unit);
1769 ppp_send_config(f->unit, PPP_MRU, 0xffffffff, 0, 0);
1770 ppp_recv_config(f->unit, PPP_MRU,
1771 (go->neg_asyncmap? go->asyncmap: 0xffffffff),
1772 go->neg_pcompression, go->neg_accompression);
1773 peer_mru[f->unit] = PPP_MRU;
1778 * lcp_starting - LCP needs the lower layer up.
1784 link_required(f->unit);
1789 * lcp_finished - LCP has finished with the lower layer.
1795 link_terminated(f->unit);
1800 * lcp_printpkt - print the contents of an LCP packet.
1802 static char *lcp_codenames[] = {
1803 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1804 "TermReq", "TermAck", "CodeRej", "ProtRej",
1805 "EchoReq", "EchoRep", "DiscReq"
1809 lcp_printpkt(p, plen, printer, arg)
1812 void (*printer) __P((void *, char *, ...));
1815 int code, id, len, olen, i;
1816 u_char *pstart, *optend;
1820 if (plen < HEADERLEN)
1826 if (len < HEADERLEN || len > plen)
1829 if (code >= 1 && code <= sizeof(lcp_codenames) / sizeof(char *))
1830 printer(arg, " %s", lcp_codenames[code-1]);
1832 printer(arg, " code=0x%x", code);
1833 printer(arg, " id=0x%x", id);
1840 /* print option list */
1845 if (olen < 2 || olen > len) {
1853 if (olen == CILEN_SHORT) {
1855 GETSHORT(cishort, p);
1856 printer(arg, "mru %d", cishort);
1860 if (olen == CILEN_LONG) {
1863 printer(arg, "asyncmap 0x%x", cilong);
1867 if (olen >= CILEN_SHORT) {
1869 printer(arg, "auth ");
1870 GETSHORT(cishort, p);
1873 printer(arg, "pap");
1876 printer(arg, "chap");
1879 case CHAP_DIGEST_MD5:
1880 printer(arg, " MD5");
1884 case CHAP_MICROSOFT:
1885 printer(arg, " m$oft");
1893 printer(arg, "0x%x", cishort);
1898 if (olen >= CILEN_SHORT) {
1900 printer(arg, "quality ");
1901 GETSHORT(cishort, p);
1904 printer(arg, "lqr");
1907 printer(arg, "0x%x", cishort);
1912 if (olen >= CILEN_CHAR) {
1914 printer(arg, "callback ");
1915 GETCHAR(cishort, p);
1918 printer(arg, "CBCP");
1921 printer(arg, "0x%x", cishort);
1925 case CI_MAGICNUMBER:
1926 if (olen == CILEN_LONG) {
1929 printer(arg, "magic 0x%x", cilong);
1932 case CI_PCOMPRESSION:
1933 if (olen == CILEN_VOID) {
1935 printer(arg, "pcomp");
1938 case CI_ACCOMPRESSION:
1939 if (olen == CILEN_VOID) {
1941 printer(arg, "accomp");
1945 if (olen == CILEN_SHORT) {
1947 GETSHORT(cishort, p);
1948 printer(arg, "mrru %d", cishort);
1952 if (olen == CILEN_VOID) {
1954 printer(arg, "ssnhf");
1958 if (olen >= CILEN_CHAR) {
1961 GETCHAR(epd.class, p);
1962 epd.length = olen - CILEN_CHAR;
1963 if (epd.length > MAX_ENDP_LEN)
1964 epd.length = MAX_ENDP_LEN;
1965 if (epd.length > 0) {
1966 BCOPY(p, epd.value, epd.length);
1969 printer(arg, "endpoint [%s]", epdisc_to_str(&epd));
1973 while (p < optend) {
1975 printer(arg, " %.2x", code);
1983 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1985 print_string(p, len, printer, arg);
1996 printer(arg, " magic=0x%x", cilong);
2003 /* print the rest of the bytes in the packet */
2004 for (i = 0; i < len && i < 32; ++i) {
2006 printer(arg, " %.2x", code);
2009 printer(arg, " ...");
2017 * Time to shut down the link because there is nothing out there.
2021 void LcpLinkFailure (f)
2024 if (f->state == OPENED) {
2025 info("No response to %d echo-requests", lcp_echos_pending);
2026 notice("Serial link appears to be disconnected.");
2027 lcp_close(f->unit, "Peer not responding");
2028 status = EXIT_PEER_DEAD;
2033 * Timer expired for the LCP echo requests from this process.
2040 LcpSendEchoRequest (f);
2041 if (f->state != OPENED)
2045 * Start the timer for the next interval.
2047 if (lcp_echo_timer_running)
2048 warn("assertion lcp_echo_timer_running==0 failed");
2049 TIMEOUT (LcpEchoTimeout, f, lcp_echo_interval);
2050 lcp_echo_timer_running = 1;
2054 * LcpEchoTimeout - Timer expired on the LCP echo
2058 LcpEchoTimeout (arg)
2061 if (lcp_echo_timer_running != 0) {
2062 lcp_echo_timer_running = 0;
2063 LcpEchoCheck ((fsm *) arg);
2068 * LcpEchoReply - LCP has received a reply to the echo
2072 lcp_received_echo_reply (f, id, inp, len)
2080 /* Check the magic number - don't count replies from ourselves. */
2082 dbglog("lcp: received short Echo-Reply, length %d", len);
2085 GETLONG(magic, inp);
2086 if (lcp_gotoptions[f->unit].neg_magicnumber
2087 && magic == lcp_gotoptions[f->unit].magicnumber) {
2088 warn("appear to have received our own echo-reply!");
2092 /* Reset the number of outstanding echo frames */
2093 lcp_echos_pending = 0;
2097 * LcpSendEchoRequest - Send an echo request frame to the peer
2101 LcpSendEchoRequest (f)
2104 u_int32_t lcp_magic;
2105 u_char pkt[4], *pktp;
2108 * Detect the failure of the peer at this point.
2110 if (lcp_echo_fails != 0) {
2111 if (lcp_echos_pending >= lcp_echo_fails) {
2113 lcp_echos_pending = 0;
2118 * Make and send the echo request frame.
2120 if (f->state == OPENED) {
2121 lcp_magic = lcp_gotoptions[f->unit].magicnumber;
2123 PUTLONG(lcp_magic, pktp);
2124 fsm_sdata(f, ECHOREQ, lcp_echo_number++ & 0xFF, pkt, pktp - pkt);
2125 ++lcp_echos_pending;
2130 * lcp_echo_lowerup - Start the timer for the LCP frame
2134 lcp_echo_lowerup (unit)
2137 fsm *f = &lcp_fsm[unit];
2139 /* Clear the parameters for generating echo frames */
2140 lcp_echos_pending = 0;
2141 lcp_echo_number = 0;
2142 lcp_echo_timer_running = 0;
2144 /* If a timeout interval is specified then start the timer */
2145 if (lcp_echo_interval != 0)
2150 * lcp_echo_lowerdown - Stop the timer for the LCP frame
2154 lcp_echo_lowerdown (unit)
2157 fsm *f = &lcp_fsm[unit];
2159 if (lcp_echo_timer_running != 0) {
2160 UNTIMEOUT (LcpEchoTimeout, f);
2161 lcp_echo_timer_running = 0;