2 * lcp.c - PPP Link Control Protocol.
4 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
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31 * "This product includes software developed by Computing Services
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34 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
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43 #define RCSID "$Id: lcp.c,v 1.66 2003/03/04 05:13:59 fcusack Exp $"
59 static const char rcsid[] = RCSID;
62 * When the link comes up we want to be able to wait for a short while,
63 * or until seeing some input from the peer, before starting to send
64 * configure-requests. We do this by delaying the fsm_lowerup call.
66 /* steal a bit in fsm flags word */
67 #define DELAYED_UP 0x100
69 static void lcp_delayed_up __P((void *));
72 * LCP-related command-line options.
74 int lcp_echo_interval = 0; /* Interval between LCP echo-requests */
75 int lcp_echo_fails = 0; /* Tolerance to unanswered echo-requests */
76 bool lax_recv = 0; /* accept control chars in asyncmap */
77 bool noendpoint = 0; /* don't send/accept endpoint discriminator */
79 static int noopt __P((char **));
82 static int setendpoint __P((char **));
83 static void printendpoint __P((option_t *, void (*)(void *, char *, ...),
85 #endif /* HAVE_MULTILINK */
87 static option_t lcp_option_list[] = {
89 { "-all", o_special_noarg, (void *)noopt,
90 "Don't request/allow any LCP options" },
92 { "noaccomp", o_bool, &lcp_wantoptions[0].neg_accompression,
93 "Disable address/control compression",
94 OPT_A2CLR, &lcp_allowoptions[0].neg_accompression },
95 { "-ac", o_bool, &lcp_wantoptions[0].neg_accompression,
96 "Disable address/control compression",
97 OPT_ALIAS | OPT_A2CLR, &lcp_allowoptions[0].neg_accompression },
99 { "asyncmap", o_uint32, &lcp_wantoptions[0].asyncmap,
100 "Set asyncmap (for received packets)",
101 OPT_OR, &lcp_wantoptions[0].neg_asyncmap },
102 { "-as", o_uint32, &lcp_wantoptions[0].asyncmap,
103 "Set asyncmap (for received packets)",
104 OPT_ALIAS | OPT_OR, &lcp_wantoptions[0].neg_asyncmap },
105 { "default-asyncmap", o_uint32, &lcp_wantoptions[0].asyncmap,
106 "Disable asyncmap negotiation",
107 OPT_OR | OPT_NOARG | OPT_VAL(~0U) | OPT_A2CLR,
108 &lcp_allowoptions[0].neg_asyncmap },
109 { "-am", o_uint32, &lcp_wantoptions[0].asyncmap,
110 "Disable asyncmap negotiation",
111 OPT_ALIAS | OPT_OR | OPT_NOARG | OPT_VAL(~0U) | OPT_A2CLR,
112 &lcp_allowoptions[0].neg_asyncmap },
114 { "nomagic", o_bool, &lcp_wantoptions[0].neg_magicnumber,
115 "Disable magic number negotiation (looped-back line detection)",
116 OPT_A2CLR, &lcp_allowoptions[0].neg_magicnumber },
117 { "-mn", o_bool, &lcp_wantoptions[0].neg_magicnumber,
118 "Disable magic number negotiation (looped-back line detection)",
119 OPT_ALIAS | OPT_A2CLR, &lcp_allowoptions[0].neg_magicnumber },
121 { "mru", o_int, &lcp_wantoptions[0].mru,
122 "Set MRU (maximum received packet size) for negotiation",
123 OPT_PRIO, &lcp_wantoptions[0].neg_mru },
124 { "default-mru", o_bool, &lcp_wantoptions[0].neg_mru,
125 "Disable MRU negotiation (use default 1500)",
126 OPT_PRIOSUB | OPT_A2CLR, &lcp_allowoptions[0].neg_mru },
127 { "-mru", o_bool, &lcp_wantoptions[0].neg_mru,
128 "Disable MRU negotiation (use default 1500)",
129 OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR, &lcp_allowoptions[0].neg_mru },
131 { "mtu", o_int, &lcp_allowoptions[0].mru,
132 "Set our MTU", OPT_LIMITS, NULL, MAXMRU, MINMRU },
134 { "nopcomp", o_bool, &lcp_wantoptions[0].neg_pcompression,
135 "Disable protocol field compression",
136 OPT_A2CLR, &lcp_allowoptions[0].neg_pcompression },
137 { "-pc", o_bool, &lcp_wantoptions[0].neg_pcompression,
138 "Disable protocol field compression",
139 OPT_ALIAS | OPT_A2CLR, &lcp_allowoptions[0].neg_pcompression },
141 { "passive", o_bool, &lcp_wantoptions[0].passive,
142 "Set passive mode", 1 },
143 { "-p", o_bool, &lcp_wantoptions[0].passive,
144 "Set passive mode", OPT_ALIAS | 1 },
146 { "silent", o_bool, &lcp_wantoptions[0].silent,
147 "Set silent mode", 1 },
149 { "lcp-echo-failure", o_int, &lcp_echo_fails,
150 "Set number of consecutive echo failures to indicate link failure",
152 { "lcp-echo-interval", o_int, &lcp_echo_interval,
153 "Set time in seconds between LCP echo requests", OPT_PRIO },
154 { "lcp-restart", o_int, &lcp_fsm[0].timeouttime,
155 "Set time in seconds between LCP retransmissions", OPT_PRIO },
156 { "lcp-max-terminate", o_int, &lcp_fsm[0].maxtermtransmits,
157 "Set maximum number of LCP terminate-request transmissions", OPT_PRIO },
158 { "lcp-max-configure", o_int, &lcp_fsm[0].maxconfreqtransmits,
159 "Set maximum number of LCP configure-request transmissions", OPT_PRIO },
160 { "lcp-max-failure", o_int, &lcp_fsm[0].maxnakloops,
161 "Set limit on number of LCP configure-naks", OPT_PRIO },
163 { "receive-all", o_bool, &lax_recv,
164 "Accept all received control characters", 1 },
166 #ifdef HAVE_MULTILINK
167 { "mrru", o_int, &lcp_wantoptions[0].mrru,
168 "Maximum received packet size for multilink bundle",
169 OPT_PRIO, &lcp_wantoptions[0].neg_mrru },
171 { "mpshortseq", o_bool, &lcp_wantoptions[0].neg_ssnhf,
172 "Use short sequence numbers in multilink headers",
173 OPT_PRIO | 1, &lcp_allowoptions[0].neg_ssnhf },
174 { "nompshortseq", o_bool, &lcp_wantoptions[0].neg_ssnhf,
175 "Don't use short sequence numbers in multilink headers",
176 OPT_PRIOSUB | OPT_A2CLR, &lcp_allowoptions[0].neg_ssnhf },
178 { "endpoint", o_special, (void *) setendpoint,
179 "Endpoint discriminator for multilink",
180 OPT_PRIO | OPT_A2PRINTER, (void *) printendpoint },
181 #endif /* HAVE_MULTILINK */
183 { "noendpoint", o_bool, &noendpoint,
184 "Don't send or accept multilink endpoint discriminator", 1 },
190 fsm lcp_fsm[NUM_PPP]; /* LCP fsm structure (global)*/
191 lcp_options lcp_wantoptions[NUM_PPP]; /* Options that we want to request */
192 lcp_options lcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
193 lcp_options lcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
194 lcp_options lcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
196 static int lcp_echos_pending = 0; /* Number of outstanding echo msgs */
197 static int lcp_echo_number = 0; /* ID number of next echo frame */
198 static int lcp_echo_timer_running = 0; /* set if a timer is running */
200 static u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */
203 * Callbacks for fsm code. (CI = Configuration Information)
205 static void lcp_resetci __P((fsm *)); /* Reset our CI */
206 static int lcp_cilen __P((fsm *)); /* Return length of our CI */
207 static void lcp_addci __P((fsm *, u_char *, int *)); /* Add our CI to pkt */
208 static int lcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
209 static int lcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */
210 static int lcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
211 static int lcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv peer CI */
212 static void lcp_up __P((fsm *)); /* We're UP */
213 static void lcp_down __P((fsm *)); /* We're DOWN */
214 static void lcp_starting __P((fsm *)); /* We need lower layer up */
215 static void lcp_finished __P((fsm *)); /* We need lower layer down */
216 static int lcp_extcode __P((fsm *, int, int, u_char *, int));
217 static void lcp_rprotrej __P((fsm *, u_char *, int));
220 * routines to send LCP echos to peer
223 static void lcp_echo_lowerup __P((int));
224 static void lcp_echo_lowerdown __P((int));
225 static void LcpEchoTimeout __P((void *));
226 static void lcp_received_echo_reply __P((fsm *, int, u_char *, int));
227 static void LcpSendEchoRequest __P((fsm *));
228 static void LcpLinkFailure __P((fsm *));
229 static void LcpEchoCheck __P((fsm *));
231 static fsm_callbacks lcp_callbacks = { /* LCP callback routines */
232 lcp_resetci, /* Reset our Configuration Information */
233 lcp_cilen, /* Length of our Configuration Information */
234 lcp_addci, /* Add our Configuration Information */
235 lcp_ackci, /* ACK our Configuration Information */
236 lcp_nakci, /* NAK our Configuration Information */
237 lcp_rejci, /* Reject our Configuration Information */
238 lcp_reqci, /* Request peer's Configuration Information */
239 lcp_up, /* Called when fsm reaches OPENED state */
240 lcp_down, /* Called when fsm leaves OPENED state */
241 lcp_starting, /* Called when we want the lower layer up */
242 lcp_finished, /* Called when we want the lower layer down */
243 NULL, /* Called when Protocol-Reject received */
244 NULL, /* Retransmission is necessary */
245 lcp_extcode, /* Called to handle LCP-specific codes */
246 "LCP" /* String name of protocol */
250 * Protocol entry points.
251 * Some of these are called directly.
254 static void lcp_init __P((int));
255 static void lcp_input __P((int, u_char *, int));
256 static void lcp_protrej __P((int));
257 static int lcp_printpkt __P((u_char *, int,
258 void (*) __P((void *, char *, ...)), void *));
260 struct protent lcp_protent = {
280 int lcp_loopbackfail = DEFLOOPBACKFAIL;
283 * Length of each type of configuration option (in octets)
287 #define CILEN_SHORT 4 /* CILEN_VOID + 2 */
288 #define CILEN_CHAP 5 /* CILEN_VOID + 2 + 1 */
289 #define CILEN_LONG 6 /* CILEN_VOID + 4 */
290 #define CILEN_LQR 8 /* CILEN_VOID + 2 + 4 */
293 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
294 (x) == CONFNAK ? "NAK" : "REJ")
297 * noopt - Disable all options (why?).
303 BZERO((char *) &lcp_wantoptions[0], sizeof (struct lcp_options));
304 BZERO((char *) &lcp_allowoptions[0], sizeof (struct lcp_options));
309 #ifdef HAVE_MULTILINK
314 if (str_to_epdisc(&lcp_wantoptions[0].endpoint, *argv)) {
315 lcp_wantoptions[0].neg_endpoint = 1;
318 option_error("Can't parse '%s' as an endpoint discriminator", *argv);
323 printendpoint(opt, printer, arg)
325 void (*printer) __P((void *, char *, ...));
328 printer(arg, "%s", epdisc_to_str(&lcp_wantoptions[0].endpoint));
330 #endif /* HAVE_MULTILINK */
333 * lcp_init - Initialize LCP.
339 fsm *f = &lcp_fsm[unit];
340 lcp_options *wo = &lcp_wantoptions[unit];
341 lcp_options *ao = &lcp_allowoptions[unit];
344 f->protocol = PPP_LCP;
345 f->callbacks = &lcp_callbacks;
349 BZERO(wo, sizeof(*wo));
352 wo->neg_asyncmap = 1;
353 wo->neg_magicnumber = 1;
354 wo->neg_pcompression = 1;
355 wo->neg_accompression = 1;
357 BZERO(ao, sizeof(*ao));
360 ao->neg_asyncmap = 1;
362 ao->chap_mdtype = MDTYPE_ALL;
365 ao->neg_magicnumber = 1;
366 ao->neg_pcompression = 1;
367 ao->neg_accompression = 1;
371 ao->neg_endpoint = 1;
376 * lcp_open - LCP is allowed to come up.
382 fsm *f = &lcp_fsm[unit];
383 lcp_options *wo = &lcp_wantoptions[unit];
385 f->flags &= ~(OPT_PASSIVE | OPT_SILENT);
387 f->flags |= OPT_PASSIVE;
389 f->flags |= OPT_SILENT;
395 * lcp_close - Take LCP down.
398 lcp_close(unit, reason)
402 fsm *f = &lcp_fsm[unit];
404 if (phase != PHASE_DEAD)
405 new_phase(PHASE_TERMINATE);
406 if (f->state == STOPPED && f->flags & (OPT_PASSIVE|OPT_SILENT)) {
408 * This action is not strictly according to the FSM in RFC1548,
409 * but it does mean that the program terminates if you do a
410 * lcp_close() in passive/silent mode when a connection hasn't
417 fsm_close(f, reason);
422 * lcp_lowerup - The lower layer is up.
428 lcp_options *wo = &lcp_wantoptions[unit];
429 fsm *f = &lcp_fsm[unit];
432 * Don't use A/C or protocol compression on transmission,
433 * but accept A/C and protocol compressed packets
434 * if we are going to ask for A/C and protocol compression.
436 if (ppp_send_config(unit, PPP_MRU, 0xffffffff, 0, 0) < 0
437 || ppp_recv_config(unit, PPP_MRU, (lax_recv? 0: 0xffffffff),
438 wo->neg_pcompression, wo->neg_accompression) < 0)
440 peer_mru[unit] = PPP_MRU;
442 if (listen_time != 0) {
443 f->flags |= DELAYED_UP;
444 timeout(lcp_delayed_up, f, 0, listen_time * 1000);
451 * lcp_lowerdown - The lower layer is down.
457 fsm *f = &lcp_fsm[unit];
459 if (f->flags & DELAYED_UP)
460 f->flags &= ~DELAYED_UP;
462 fsm_lowerdown(&lcp_fsm[unit]);
467 * lcp_delayed_up - Bring the lower layer up now.
475 if (f->flags & DELAYED_UP) {
476 f->flags &= ~DELAYED_UP;
483 * lcp_input - Input LCP packet.
486 lcp_input(unit, p, len)
491 fsm *f = &lcp_fsm[unit];
493 if (f->flags & DELAYED_UP) {
494 f->flags &= ~DELAYED_UP;
497 fsm_input(f, p, len);
502 * lcp_extcode - Handle a LCP-specific code.
505 lcp_extcode(f, code, id, inp, len)
515 lcp_rprotrej(f, inp, len);
519 if (f->state != OPENED)
522 PUTLONG(lcp_gotoptions[f->unit].magicnumber, magp);
523 fsm_sdata(f, ECHOREP, id, inp, len);
527 lcp_received_echo_reply(f, id, inp, len);
541 * lcp_rprotrej - Receive an Protocol-Reject.
543 * Figure out which protocol is rejected and inform it.
546 lcp_rprotrej(f, inp, len)
552 struct protent *protp;
556 LCPDEBUG(("lcp_rprotrej: Rcvd short Protocol-Reject packet!"));
563 * Protocol-Reject packets received in any state other than the LCP
564 * OPENED state SHOULD be silently discarded.
566 if( f->state != OPENED ){
567 LCPDEBUG(("Protocol-Reject discarded: LCP in state %d", f->state));
572 * Upcall the proper Protocol-Reject routine.
574 for (i = 0; (protp = protocols[i]) != NULL; ++i)
575 if (protp->protocol == prot && protp->enabled_flag) {
576 (*protp->protrej)(f->unit);
580 warn("Protocol-Reject for unsupported protocol 0x%x", prot);
585 * lcp_protrej - A Protocol-Reject was received.
595 error("Received Protocol-Reject for LCP!");
596 fsm_protreject(&lcp_fsm[unit]);
601 * lcp_sprotrej - Send a Protocol-Reject for some protocol.
604 lcp_sprotrej(unit, p, len)
610 * Send back the protocol and the information field of the
611 * rejected packet. We only get here if LCP is in the OPENED state.
616 fsm_sdata(&lcp_fsm[unit], PROTREJ, ++lcp_fsm[unit].id,
622 * lcp_resetci - Reset our CI.
628 lcp_options *wo = &lcp_wantoptions[f->unit];
629 lcp_options *go = &lcp_gotoptions[f->unit];
630 lcp_options *ao = &lcp_allowoptions[f->unit];
632 wo->magicnumber = magic();
638 go->neg_endpoint = 0;
641 ao->neg_endpoint = 0;
642 peer_mru[f->unit] = PPP_MRU;
648 * lcp_cilen - Return length of our CI.
654 lcp_options *go = &lcp_gotoptions[f->unit];
656 #define LENCIVOID(neg) ((neg) ? CILEN_VOID : 0)
657 #define LENCICHAP(neg) ((neg) ? CILEN_CHAP : 0)
658 #define LENCISHORT(neg) ((neg) ? CILEN_SHORT : 0)
659 #define LENCILONG(neg) ((neg) ? CILEN_LONG : 0)
660 #define LENCILQR(neg) ((neg) ? CILEN_LQR: 0)
661 #define LENCICBCP(neg) ((neg) ? CILEN_CBCP: 0)
663 * NB: we only ask for one of CHAP, UPAP, or EAP, even if we will
664 * accept more than one. We prefer EAP first, then CHAP, then
667 return (LENCISHORT(go->neg_mru && go->mru != DEFMRU) +
668 LENCILONG(go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF) +
669 LENCISHORT(go->neg_eap) +
670 LENCICHAP(!go->neg_eap && go->neg_chap) +
671 LENCISHORT(!go->neg_eap && !go->neg_chap && go->neg_upap) +
672 LENCILQR(go->neg_lqr) +
673 LENCICBCP(go->neg_cbcp) +
674 LENCILONG(go->neg_magicnumber) +
675 LENCIVOID(go->neg_pcompression) +
676 LENCIVOID(go->neg_accompression) +
677 LENCISHORT(go->neg_mrru) +
678 LENCIVOID(go->neg_ssnhf) +
679 (go->neg_endpoint? CILEN_CHAR + go->endpoint.length: 0));
684 * lcp_addci - Add our desired CIs to a packet.
687 lcp_addci(f, ucp, lenp)
692 lcp_options *go = &lcp_gotoptions[f->unit];
693 u_char *start_ucp = ucp;
695 #define ADDCIVOID(opt, neg) \
698 PUTCHAR(CILEN_VOID, ucp); \
700 #define ADDCISHORT(opt, neg, val) \
703 PUTCHAR(CILEN_SHORT, ucp); \
704 PUTSHORT(val, ucp); \
706 #define ADDCICHAP(opt, neg, val) \
708 PUTCHAR((opt), ucp); \
709 PUTCHAR(CILEN_CHAP, ucp); \
710 PUTSHORT(PPP_CHAP, ucp); \
711 PUTCHAR((CHAP_DIGEST(val)), ucp); \
713 #define ADDCILONG(opt, neg, val) \
716 PUTCHAR(CILEN_LONG, ucp); \
719 #define ADDCILQR(opt, neg, val) \
722 PUTCHAR(CILEN_LQR, ucp); \
723 PUTSHORT(PPP_LQR, ucp); \
726 #define ADDCICHAR(opt, neg, val) \
729 PUTCHAR(CILEN_CHAR, ucp); \
732 #define ADDCIENDP(opt, neg, class, val, len) \
736 PUTCHAR(CILEN_CHAR + len, ucp); \
737 PUTCHAR(class, ucp); \
738 for (i = 0; i < len; ++i) \
739 PUTCHAR(val[i], ucp); \
742 ADDCISHORT(CI_MRU, go->neg_mru && go->mru != DEFMRU, go->mru);
743 ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF,
745 ADDCISHORT(CI_AUTHTYPE, go->neg_eap, PPP_EAP);
746 ADDCICHAP(CI_AUTHTYPE, !go->neg_eap && go->neg_chap, go->chap_mdtype);
747 ADDCISHORT(CI_AUTHTYPE, !go->neg_eap && !go->neg_chap && go->neg_upap,
749 ADDCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
750 ADDCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
751 ADDCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
752 ADDCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
753 ADDCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
754 ADDCISHORT(CI_MRRU, go->neg_mrru, go->mrru);
755 ADDCIVOID(CI_SSNHF, go->neg_ssnhf);
756 ADDCIENDP(CI_EPDISC, go->neg_endpoint, go->endpoint.class,
757 go->endpoint.value, go->endpoint.length);
759 if (ucp - start_ucp != *lenp) {
760 /* this should never happen, because peer_mtu should be 1500 */
761 error("Bug in lcp_addci: wrong length");
767 * lcp_ackci - Ack our CIs.
768 * This should not modify any state if the Ack is bad.
780 lcp_options *go = &lcp_gotoptions[f->unit];
781 u_char cilen, citype, cichar;
786 * CIs must be in exactly the same order that we sent.
787 * Check packet length and CI length at each step.
788 * If we find any deviations, then this packet is bad.
790 #define ACKCIVOID(opt, neg) \
792 if ((len -= CILEN_VOID) < 0) \
794 GETCHAR(citype, p); \
796 if (cilen != CILEN_VOID || \
800 #define ACKCISHORT(opt, neg, val) \
802 if ((len -= CILEN_SHORT) < 0) \
804 GETCHAR(citype, p); \
806 if (cilen != CILEN_SHORT || \
809 GETSHORT(cishort, p); \
810 if (cishort != val) \
813 #define ACKCICHAR(opt, neg, val) \
815 if ((len -= CILEN_CHAR) < 0) \
817 GETCHAR(citype, p); \
819 if (cilen != CILEN_CHAR || \
822 GETCHAR(cichar, p); \
826 #define ACKCICHAP(opt, neg, val) \
828 if ((len -= CILEN_CHAP) < 0) \
830 GETCHAR(citype, p); \
832 if (cilen != CILEN_CHAP || \
835 GETSHORT(cishort, p); \
836 if (cishort != PPP_CHAP) \
838 GETCHAR(cichar, p); \
839 if (cichar != (CHAP_DIGEST(val))) \
842 #define ACKCILONG(opt, neg, val) \
844 if ((len -= CILEN_LONG) < 0) \
846 GETCHAR(citype, p); \
848 if (cilen != CILEN_LONG || \
851 GETLONG(cilong, p); \
855 #define ACKCILQR(opt, neg, val) \
857 if ((len -= CILEN_LQR) < 0) \
859 GETCHAR(citype, p); \
861 if (cilen != CILEN_LQR || \
864 GETSHORT(cishort, p); \
865 if (cishort != PPP_LQR) \
867 GETLONG(cilong, p); \
871 #define ACKCIENDP(opt, neg, class, val, vlen) \
874 if ((len -= CILEN_CHAR + vlen) < 0) \
876 GETCHAR(citype, p); \
878 if (cilen != CILEN_CHAR + vlen || \
881 GETCHAR(cichar, p); \
882 if (cichar != class) \
884 for (i = 0; i < vlen; ++i) { \
885 GETCHAR(cichar, p); \
886 if (cichar != val[i]) \
891 ACKCISHORT(CI_MRU, go->neg_mru && go->mru != DEFMRU, go->mru);
892 ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF,
894 ACKCISHORT(CI_AUTHTYPE, go->neg_eap, PPP_EAP);
895 ACKCICHAP(CI_AUTHTYPE, !go->neg_eap && go->neg_chap, go->chap_mdtype);
896 ACKCISHORT(CI_AUTHTYPE, !go->neg_eap && !go->neg_chap && go->neg_upap,
898 ACKCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
899 ACKCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
900 ACKCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
901 ACKCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
902 ACKCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
903 ACKCISHORT(CI_MRRU, go->neg_mrru, go->mrru);
904 ACKCIVOID(CI_SSNHF, go->neg_ssnhf);
905 ACKCIENDP(CI_EPDISC, go->neg_endpoint, go->endpoint.class,
906 go->endpoint.value, go->endpoint.length);
909 * If there are any remaining CIs, then this packet is bad.
915 LCPDEBUG(("lcp_acki: received bad Ack!"));
921 * lcp_nakci - Peer has sent a NAK for some of our CIs.
922 * This should not modify any state if the Nak is bad
923 * or if LCP is in the OPENED state.
935 lcp_options *go = &lcp_gotoptions[f->unit];
936 lcp_options *wo = &lcp_wantoptions[f->unit];
937 u_char citype, cichar, *next;
940 lcp_options no; /* options we've seen Naks for */
941 lcp_options try; /* options to request next time */
945 BZERO(&no, sizeof(no));
949 * Any Nak'd CIs must be in exactly the same order that we sent.
950 * Check packet length and CI length at each step.
951 * If we find any deviations, then this packet is bad.
953 #define NAKCIVOID(opt, neg) \
955 len >= CILEN_VOID && \
956 p[1] == CILEN_VOID && \
959 INCPTR(CILEN_VOID, p); \
963 #define NAKCICHAP(opt, neg, code) \
965 len >= CILEN_CHAP && \
966 p[1] == CILEN_CHAP && \
970 GETSHORT(cishort, p); \
971 GETCHAR(cichar, p); \
975 #define NAKCICHAR(opt, neg, code) \
977 len >= CILEN_CHAR && \
978 p[1] == CILEN_CHAR && \
982 GETCHAR(cichar, p); \
986 #define NAKCISHORT(opt, neg, code) \
988 len >= CILEN_SHORT && \
989 p[1] == CILEN_SHORT && \
991 len -= CILEN_SHORT; \
993 GETSHORT(cishort, p); \
997 #define NAKCILONG(opt, neg, code) \
999 len >= CILEN_LONG && \
1000 p[1] == CILEN_LONG && \
1002 len -= CILEN_LONG; \
1004 GETLONG(cilong, p); \
1008 #define NAKCILQR(opt, neg, code) \
1010 len >= CILEN_LQR && \
1011 p[1] == CILEN_LQR && \
1015 GETSHORT(cishort, p); \
1016 GETLONG(cilong, p); \
1020 #define NAKCIENDP(opt, neg) \
1022 len >= CILEN_CHAR && \
1024 p[1] >= CILEN_CHAR && \
1033 * We don't care if they want to send us smaller packets than
1034 * we want. Therefore, accept any MRU less than what we asked for,
1035 * but then ignore the new value when setting the MRU in the kernel.
1036 * If they send us a bigger MRU than what we asked, accept it, up to
1037 * the limit of the default MRU we'd get if we didn't negotiate.
1039 if (go->neg_mru && go->mru != DEFMRU) {
1040 NAKCISHORT(CI_MRU, neg_mru,
1041 if (cishort <= wo->mru || cishort <= DEFMRU)
1047 * Add any characters they want to our (receive-side) asyncmap.
1049 if (go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF) {
1050 NAKCILONG(CI_ASYNCMAP, neg_asyncmap,
1051 try.asyncmap = go->asyncmap | cilong;
1056 * If they've nak'd our authentication-protocol, check whether
1057 * they are proposing a different protocol, or a different
1058 * hash algorithm for CHAP.
1060 if ((go->neg_chap || go->neg_upap || go->neg_eap)
1061 && len >= CILEN_SHORT
1062 && p[0] == CI_AUTHTYPE && p[1] >= CILEN_SHORT && p[1] <= len) {
1065 no.neg_chap = go->neg_chap;
1066 no.neg_upap = go->neg_upap;
1067 no.neg_eap = go->neg_eap;
1069 GETSHORT(cishort, p);
1070 if (cishort == PPP_PAP && cilen == CILEN_SHORT) {
1071 /* If we were asking for EAP, then we need to stop that. */
1075 /* If we were asking for CHAP, then we need to stop that. */
1076 else if (go->neg_chap)
1079 * If we weren't asking for CHAP or EAP, then we were asking for
1080 * PAP, in which case this Nak is bad.
1085 } else if (cishort == PPP_CHAP && cilen == CILEN_CHAP) {
1087 /* Stop asking for EAP, if we were. */
1090 /* Try to set up to use their suggestion, if possible */
1091 if (CHAP_CANDIGEST(go->chap_mdtype, cichar))
1092 go->chap_mdtype = CHAP_MDTYPE_D(cichar);
1093 } else if (go->neg_chap) {
1095 * We were asking for our preferred algorithm, they must
1096 * want something different.
1098 if (cichar != CHAP_DIGEST(go->chap_mdtype)) {
1099 if (CHAP_CANDIGEST(go->chap_mdtype, cichar)) {
1100 /* Use their suggestion if we support it ... */
1101 go->chap_mdtype = CHAP_MDTYPE_D(cichar);
1103 /* ... otherwise, try our next-preferred algorithm. */
1104 try.chap_mdtype &= ~(CHAP_MDTYPE(try.chap_mdtype));
1105 if (try.chap_mdtype == MDTYPE_NONE) /* out of algos */
1110 * Whoops, they Nak'd our algorithm of choice
1111 * but then suggested it back to us.
1117 * Stop asking for PAP if we were asking for it.
1125 * If we were asking for EAP, and they're Conf-Naking EAP,
1126 * well, that's just strange. Nobody should do that.
1128 if (cishort == PPP_EAP && cilen == CILEN_SHORT && go->neg_eap)
1129 dbglog("Unexpected Conf-Nak for EAP");
1132 * We don't recognize what they're suggesting.
1133 * Stop asking for what we were asking for.
1137 else if (go->neg_chap)
1141 p += cilen - CILEN_SHORT;
1146 * If they can't cope with our link quality protocol, we'll have
1147 * to stop asking for LQR. We haven't got any other protocol.
1148 * If they Nak the reporting period, take their value XXX ?
1150 NAKCILQR(CI_QUALITY, neg_lqr,
1151 if (cishort != PPP_LQR)
1154 try.lqr_period = cilong;
1158 * Only implementing CBCP...not the rest of the callback options
1160 NAKCICHAR(CI_CALLBACK, neg_cbcp,
1165 * Check for a looped-back line.
1167 NAKCILONG(CI_MAGICNUMBER, neg_magicnumber,
1168 try.magicnumber = magic();
1173 * Peer shouldn't send Nak for protocol compression or
1174 * address/control compression requests; they should send
1175 * a Reject instead. If they send a Nak, treat it as a Reject.
1177 NAKCIVOID(CI_PCOMPRESSION, neg_pcompression);
1178 NAKCIVOID(CI_ACCOMPRESSION, neg_accompression);
1181 * Nak for MRRU option - accept their value if it is smaller
1182 * than the one we want.
1185 NAKCISHORT(CI_MRRU, neg_mrru,
1186 if (cishort <= wo->mrru)
1192 * Nak for short sequence numbers shouldn't be sent, treat it
1195 NAKCIVOID(CI_SSNHF, neg_ssnhf);
1198 * Nak of the endpoint discriminator option is not permitted,
1199 * treat it like a reject.
1201 NAKCIENDP(CI_EPDISC, neg_endpoint);
1204 * There may be remaining CIs, if the peer is requesting negotiation
1205 * on an option that we didn't include in our request packet.
1206 * If we see an option that we requested, or one we've already seen
1207 * in this packet, then this packet is bad.
1208 * If we wanted to respond by starting to negotiate on the requested
1209 * option(s), we could, but we don't, because except for the
1210 * authentication type and quality protocol, if we are not negotiating
1211 * an option, it is because we were told not to.
1212 * For the authentication type, the Nak from the peer means
1213 * `let me authenticate myself with you' which is a bit pointless.
1214 * For the quality protocol, the Nak means `ask me to send you quality
1215 * reports', but if we didn't ask for them, we don't want them.
1216 * An option we don't recognize represents the peer asking to
1217 * negotiate some option we don't support, so ignore it.
1219 while (len > CILEN_VOID) {
1222 if (cilen < CILEN_VOID || (len -= cilen) < 0)
1224 next = p + cilen - 2;
1228 if ((go->neg_mru && go->mru != DEFMRU)
1229 || no.neg_mru || cilen != CILEN_SHORT)
1231 GETSHORT(cishort, p);
1232 if (cishort < DEFMRU) {
1238 if ((go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF)
1239 || no.neg_asyncmap || cilen != CILEN_LONG)
1243 if (go->neg_chap || no.neg_chap || go->neg_upap || no.neg_upap ||
1244 go->neg_eap || no.neg_eap)
1247 case CI_MAGICNUMBER:
1248 if (go->neg_magicnumber || no.neg_magicnumber ||
1249 cilen != CILEN_LONG)
1252 case CI_PCOMPRESSION:
1253 if (go->neg_pcompression || no.neg_pcompression
1254 || cilen != CILEN_VOID)
1257 case CI_ACCOMPRESSION:
1258 if (go->neg_accompression || no.neg_accompression
1259 || cilen != CILEN_VOID)
1263 if (go->neg_lqr || no.neg_lqr || cilen != CILEN_LQR)
1267 if (go->neg_mrru || no.neg_mrru || cilen != CILEN_SHORT)
1271 if (go->neg_ssnhf || no.neg_ssnhf || cilen != CILEN_VOID)
1276 if (go->neg_endpoint || no.neg_endpoint || cilen < CILEN_CHAR)
1284 * OK, the Nak is good. Now we can update state.
1285 * If there are any options left we ignore them.
1287 if (f->state != OPENED) {
1289 if (++try.numloops >= lcp_loopbackfail) {
1290 notice("Serial line is looped back.");
1291 lcp_close(f->unit, "Loopback detected");
1292 status = EXIT_LOOPBACK;
1302 LCPDEBUG(("lcp_nakci: received bad Nak!"));
1308 * lcp_rejci - Peer has Rejected some of our CIs.
1309 * This should not modify any state if the Reject is bad
1310 * or if LCP is in the OPENED state.
1313 * 0 - Reject was bad.
1314 * 1 - Reject was good.
1317 lcp_rejci(f, p, len)
1322 lcp_options *go = &lcp_gotoptions[f->unit];
1326 lcp_options try; /* options to request next time */
1331 * Any Rejected CIs must be in exactly the same order that we sent.
1332 * Check packet length and CI length at each step.
1333 * If we find any deviations, then this packet is bad.
1335 #define REJCIVOID(opt, neg) \
1337 len >= CILEN_VOID && \
1338 p[1] == CILEN_VOID && \
1340 len -= CILEN_VOID; \
1341 INCPTR(CILEN_VOID, p); \
1344 #define REJCISHORT(opt, neg, val) \
1346 len >= CILEN_SHORT && \
1347 p[1] == CILEN_SHORT && \
1349 len -= CILEN_SHORT; \
1351 GETSHORT(cishort, p); \
1352 /* Check rejected value. */ \
1353 if (cishort != val) \
1357 #define REJCICHAP(opt, neg, val) \
1359 len >= CILEN_CHAP && \
1360 p[1] == CILEN_CHAP && \
1362 len -= CILEN_CHAP; \
1364 GETSHORT(cishort, p); \
1365 GETCHAR(cichar, p); \
1366 /* Check rejected value. */ \
1367 if ((cishort != PPP_CHAP) || (cichar != (CHAP_DIGEST(val)))) \
1370 try.neg_eap = try.neg_upap = 0; \
1372 #define REJCILONG(opt, neg, val) \
1374 len >= CILEN_LONG && \
1375 p[1] == CILEN_LONG && \
1377 len -= CILEN_LONG; \
1379 GETLONG(cilong, p); \
1380 /* Check rejected value. */ \
1381 if (cilong != val) \
1385 #define REJCILQR(opt, neg, val) \
1387 len >= CILEN_LQR && \
1388 p[1] == CILEN_LQR && \
1392 GETSHORT(cishort, p); \
1393 GETLONG(cilong, p); \
1394 /* Check rejected value. */ \
1395 if (cishort != PPP_LQR || cilong != val) \
1399 #define REJCICBCP(opt, neg, val) \
1401 len >= CILEN_CBCP && \
1402 p[1] == CILEN_CBCP && \
1404 len -= CILEN_CBCP; \
1406 GETCHAR(cichar, p); \
1407 /* Check rejected value. */ \
1408 if (cichar != val) \
1412 #define REJCIENDP(opt, neg, class, val, vlen) \
1414 len >= CILEN_CHAR + vlen && \
1416 p[1] == CILEN_CHAR + vlen) { \
1418 len -= CILEN_CHAR + vlen; \
1420 GETCHAR(cichar, p); \
1421 if (cichar != class) \
1423 for (i = 0; i < vlen; ++i) { \
1424 GETCHAR(cichar, p); \
1425 if (cichar != val[i]) \
1431 REJCISHORT(CI_MRU, neg_mru, go->mru);
1432 REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap);
1433 REJCISHORT(CI_AUTHTYPE, neg_eap, PPP_EAP);
1435 REJCICHAP(CI_AUTHTYPE, neg_chap, go->chap_mdtype);
1436 if (!go->neg_chap) {
1437 REJCISHORT(CI_AUTHTYPE, neg_upap, PPP_PAP);
1440 REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period);
1441 REJCICBCP(CI_CALLBACK, neg_cbcp, CBCP_OPT);
1442 REJCILONG(CI_MAGICNUMBER, neg_magicnumber, go->magicnumber);
1443 REJCIVOID(CI_PCOMPRESSION, neg_pcompression);
1444 REJCIVOID(CI_ACCOMPRESSION, neg_accompression);
1445 REJCISHORT(CI_MRRU, neg_mrru, go->mrru);
1446 REJCIVOID(CI_SSNHF, neg_ssnhf);
1447 REJCIENDP(CI_EPDISC, neg_endpoint, go->endpoint.class,
1448 go->endpoint.value, go->endpoint.length);
1451 * If there are any remaining CIs, then this packet is bad.
1456 * Now we can update state.
1458 if (f->state != OPENED)
1463 LCPDEBUG(("lcp_rejci: received bad Reject!"));
1469 * lcp_reqci - Check the peer's requested CIs and send appropriate response.
1471 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1472 * appropriately. If reject_if_disagree is non-zero, doesn't return
1473 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1476 lcp_reqci(f, inp, lenp, reject_if_disagree)
1478 u_char *inp; /* Requested CIs */
1479 int *lenp; /* Length of requested CIs */
1480 int reject_if_disagree;
1482 lcp_options *go = &lcp_gotoptions[f->unit];
1483 lcp_options *ho = &lcp_hisoptions[f->unit];
1484 lcp_options *ao = &lcp_allowoptions[f->unit];
1485 u_char *cip, *next; /* Pointer to current and next CIs */
1486 int cilen, citype, cichar; /* Parsed len, type, char value */
1487 u_short cishort; /* Parsed short value */
1488 u_int32_t cilong; /* Parse long value */
1489 int rc = CONFACK; /* Final packet return code */
1490 int orc; /* Individual option return code */
1491 u_char *p; /* Pointer to next char to parse */
1492 u_char *rejp; /* Pointer to next char in reject frame */
1493 u_char *nakp; /* Pointer to next char in Nak frame */
1494 int l = *lenp; /* Length left */
1497 * Reset all his options.
1499 BZERO(ho, sizeof(*ho));
1502 * Process all his options.
1508 orc = CONFACK; /* Assume success */
1509 cip = p = next; /* Remember begining of CI */
1510 if (l < 2 || /* Not enough data for CI header or */
1511 p[1] < 2 || /* CI length too small or */
1512 p[1] > l) { /* CI length too big? */
1513 LCPDEBUG(("lcp_reqci: bad CI length!"));
1514 orc = CONFREJ; /* Reject bad CI */
1515 cilen = l; /* Reject till end of packet */
1516 l = 0; /* Don't loop again */
1520 GETCHAR(citype, p); /* Parse CI type */
1521 GETCHAR(cilen, p); /* Parse CI length */
1522 l -= cilen; /* Adjust remaining length */
1523 next += cilen; /* Step to next CI */
1525 switch (citype) { /* Check CI type */
1527 if (!ao->neg_mru || /* Allow option? */
1528 cilen != CILEN_SHORT) { /* Check CI length */
1529 orc = CONFREJ; /* Reject CI */
1532 GETSHORT(cishort, p); /* Parse MRU */
1535 * He must be able to receive at least our minimum.
1536 * No need to check a maximum. If he sends a large number,
1537 * we'll just ignore it.
1539 if (cishort < MINMRU) {
1540 orc = CONFNAK; /* Nak CI */
1541 PUTCHAR(CI_MRU, nakp);
1542 PUTCHAR(CILEN_SHORT, nakp);
1543 PUTSHORT(MINMRU, nakp); /* Give him a hint */
1546 ho->neg_mru = 1; /* Remember he sent MRU */
1547 ho->mru = cishort; /* And remember value */
1551 if (!ao->neg_asyncmap ||
1552 cilen != CILEN_LONG) {
1559 * Asyncmap must have set at least the bits
1560 * which are set in lcp_allowoptions[unit].asyncmap.
1562 if ((ao->asyncmap & ~cilong) != 0) {
1564 PUTCHAR(CI_ASYNCMAP, nakp);
1565 PUTCHAR(CILEN_LONG, nakp);
1566 PUTLONG(ao->asyncmap | cilong, nakp);
1569 ho->neg_asyncmap = 1;
1570 ho->asyncmap = cilong;
1574 if (cilen < CILEN_SHORT ||
1575 !(ao->neg_upap || ao->neg_chap || ao->neg_eap)) {
1577 * Reject the option if we're not willing to authenticate.
1579 dbglog("No auth is possible");
1583 GETSHORT(cishort, p);
1586 * Authtype must be PAP, CHAP, or EAP.
1588 * Note: if more than one of ao->neg_upap, ao->neg_chap, and
1589 * ao->neg_eap are set, and the peer sends a Configure-Request
1590 * with two or more authenticate-protocol requests, then we will
1591 * reject the second request.
1592 * Whether we end up doing CHAP, UPAP, or EAP depends then on
1593 * the ordering of the CIs in the peer's Configure-Request.
1596 if (cishort == PPP_PAP) {
1597 /* we've already accepted CHAP or EAP */
1598 if (ho->neg_chap || ho->neg_eap ||
1599 cilen != CILEN_SHORT) {
1600 LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE PAP, rejecting..."));
1604 if (!ao->neg_upap) { /* we don't want to do PAP */
1605 orc = CONFNAK; /* NAK it and suggest CHAP or EAP */
1607 PUTCHAR(CILEN_SHORT, nakp);
1608 PUTSHORT(PPP_EAP, nakp);
1610 PUTCHAR(CI_AUTHTYPE, nakp);
1611 PUTCHAR(CILEN_CHAP, nakp);
1612 PUTSHORT(PPP_CHAP, nakp);
1613 PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakp);
1620 if (cishort == PPP_CHAP) {
1621 /* we've already accepted PAP or EAP */
1622 if (ho->neg_upap || ho->neg_eap ||
1623 cilen != CILEN_CHAP) {
1624 LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE CHAP, rejecting..."));
1628 if (!ao->neg_chap) { /* we don't want to do CHAP */
1629 orc = CONFNAK; /* NAK it and suggest EAP or PAP */
1630 PUTCHAR(CI_AUTHTYPE, nakp);
1631 PUTCHAR(CILEN_SHORT, nakp);
1633 PUTSHORT(PPP_EAP, nakp);
1635 PUTSHORT(PPP_PAP, nakp);
1639 GETCHAR(cichar, p); /* get digest type */
1640 if (!(CHAP_CANDIGEST(ao->chap_mdtype, cichar))) {
1642 * We can't/won't do the requested type,
1643 * suggest something else.
1646 PUTCHAR(CI_AUTHTYPE, nakp);
1647 PUTCHAR(CILEN_CHAP, nakp);
1648 PUTSHORT(PPP_CHAP, nakp);
1649 PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakp);
1652 ho->chap_mdtype = CHAP_MDTYPE_D(cichar); /* save md type */
1656 if (cishort == PPP_EAP) {
1657 /* we've already accepted CHAP or PAP */
1658 if (ho->neg_chap || ho->neg_upap || cilen != CILEN_SHORT) {
1659 LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE EAP, rejecting..."));
1663 if (!ao->neg_eap) { /* we don't want to do EAP */
1664 orc = CONFNAK; /* NAK it and suggest CHAP or PAP */
1665 PUTCHAR(CI_AUTHTYPE, nakp);
1667 PUTCHAR(CILEN_CHAP, nakp);
1668 PUTSHORT(PPP_CHAP, nakp);
1669 PUTCHAR(ao->chap_mdtype, nakp);
1671 PUTCHAR(CILEN_SHORT, nakp);
1672 PUTSHORT(PPP_PAP, nakp);
1681 * We don't recognize the protocol they're asking for.
1682 * Nak it with something we're willing to do.
1683 * (At this point we know ao->neg_upap || ao->neg_chap ||
1687 PUTCHAR(CI_AUTHTYPE, nakp);
1689 PUTCHAR(CILEN_SHORT, nakp);
1690 PUTSHORT(PPP_EAP, nakp);
1691 } else if (ao->neg_chap) {
1692 PUTCHAR(CILEN_CHAP, nakp);
1693 PUTSHORT(PPP_CHAP, nakp);
1694 PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakp);
1696 PUTCHAR(CILEN_SHORT, nakp);
1697 PUTSHORT(PPP_PAP, nakp);
1703 cilen != CILEN_LQR) {
1708 GETSHORT(cishort, p);
1712 * Check the protocol and the reporting period.
1713 * XXX When should we Nak this, and what with?
1715 if (cishort != PPP_LQR) {
1717 PUTCHAR(CI_QUALITY, nakp);
1718 PUTCHAR(CILEN_LQR, nakp);
1719 PUTSHORT(PPP_LQR, nakp);
1720 PUTLONG(ao->lqr_period, nakp);
1725 case CI_MAGICNUMBER:
1726 if (!(ao->neg_magicnumber || go->neg_magicnumber) ||
1727 cilen != CILEN_LONG) {
1734 * He must have a different magic number.
1736 if (go->neg_magicnumber &&
1737 cilong == go->magicnumber) {
1738 cilong = magic(); /* Don't put magic() inside macro! */
1740 PUTCHAR(CI_MAGICNUMBER, nakp);
1741 PUTCHAR(CILEN_LONG, nakp);
1742 PUTLONG(cilong, nakp);
1745 ho->neg_magicnumber = 1;
1746 ho->magicnumber = cilong;
1750 case CI_PCOMPRESSION:
1751 if (!ao->neg_pcompression ||
1752 cilen != CILEN_VOID) {
1756 ho->neg_pcompression = 1;
1759 case CI_ACCOMPRESSION:
1760 if (!ao->neg_accompression ||
1761 cilen != CILEN_VOID) {
1765 ho->neg_accompression = 1;
1769 if (!ao->neg_mrru || !multilink ||
1770 cilen != CILEN_SHORT) {
1775 GETSHORT(cishort, p);
1776 /* possibly should insist on a minimum/maximum MRRU here */
1782 if (!ao->neg_ssnhf || !multilink ||
1783 cilen != CILEN_VOID) {
1791 if (!ao->neg_endpoint ||
1792 cilen < CILEN_CHAR ||
1793 cilen > CILEN_CHAR + MAX_ENDP_LEN) {
1798 cilen -= CILEN_CHAR;
1799 ho->neg_endpoint = 1;
1800 ho->endpoint.class = cichar;
1801 ho->endpoint.length = cilen;
1802 BCOPY(p, ho->endpoint.value, cilen);
1807 LCPDEBUG(("lcp_reqci: rcvd unknown option %d", citype));
1813 if (orc == CONFACK && /* Good CI */
1814 rc != CONFACK) /* but prior CI wasnt? */
1815 continue; /* Don't send this one */
1817 if (orc == CONFNAK) { /* Nak this CI? */
1818 if (reject_if_disagree /* Getting fed up with sending NAKs? */
1819 && citype != CI_MAGICNUMBER) {
1820 orc = CONFREJ; /* Get tough if so */
1822 if (rc == CONFREJ) /* Rejecting prior CI? */
1823 continue; /* Don't send this one */
1827 if (orc == CONFREJ) { /* Reject this CI */
1829 if (cip != rejp) /* Need to move rejected CI? */
1830 BCOPY(cip, rejp, cilen); /* Move it */
1831 INCPTR(cilen, rejp); /* Update output pointer */
1836 * If we wanted to send additional NAKs (for unsent CIs), the
1837 * code would go here. The extra NAKs would go at *nakp.
1838 * At present there are no cases where we want to ask the
1839 * peer to negotiate an option.
1848 * Copy the Nak'd options from the nak_buffer to the caller's buffer.
1850 *lenp = nakp - nak_buffer;
1851 BCOPY(nak_buffer, inp, *lenp);
1858 LCPDEBUG(("lcp_reqci: returning CONF%s.", CODENAME(rc)));
1859 return (rc); /* Return final code */
1864 * lcp_up - LCP has come UP.
1870 lcp_options *wo = &lcp_wantoptions[f->unit];
1871 lcp_options *ho = &lcp_hisoptions[f->unit];
1872 lcp_options *go = &lcp_gotoptions[f->unit];
1873 lcp_options *ao = &lcp_allowoptions[f->unit];
1876 if (!go->neg_magicnumber)
1877 go->magicnumber = 0;
1878 if (!ho->neg_magicnumber)
1879 ho->magicnumber = 0;
1882 * Set our MTU to the smaller of the MTU we wanted and
1883 * the MRU our peer wanted. If we negotiated an MRU,
1884 * set our MRU to the larger of value we wanted and
1885 * the value we got in the negotiation.
1886 * Note on the MTU: the link MTU can be the MRU the peer wanted,
1887 * the interface MTU is set to the lowest of that, the
1888 * MTU we want to use, and our link MRU.
1890 mtu = ho->neg_mru? ho->mru: PPP_MRU;
1891 mru = go->neg_mru? MAX(wo->mru, go->mru): PPP_MRU;
1892 #ifdef HAVE_MULTILINK
1893 if (!(multilink && go->neg_mrru && ho->neg_mrru))
1894 #endif /* HAVE_MULTILINK */
1895 netif_set_mtu(f->unit, MIN(MIN(mtu, mru), ao->mru));
1896 ppp_send_config(f->unit, mtu,
1897 (ho->neg_asyncmap? ho->asyncmap: 0xffffffff),
1898 ho->neg_pcompression, ho->neg_accompression);
1899 ppp_recv_config(f->unit, mru,
1900 (lax_recv? 0: go->neg_asyncmap? go->asyncmap: 0xffffffff),
1901 go->neg_pcompression, go->neg_accompression);
1904 peer_mru[f->unit] = ho->mru;
1906 lcp_echo_lowerup(f->unit); /* Enable echo messages */
1908 link_established(f->unit);
1913 * lcp_down - LCP has gone DOWN.
1915 * Alert other protocols.
1921 lcp_options *go = &lcp_gotoptions[f->unit];
1923 lcp_echo_lowerdown(f->unit);
1927 ppp_send_config(f->unit, PPP_MRU, 0xffffffff, 0, 0);
1928 ppp_recv_config(f->unit, PPP_MRU,
1929 (go->neg_asyncmap? go->asyncmap: 0xffffffff),
1930 go->neg_pcompression, go->neg_accompression);
1931 peer_mru[f->unit] = PPP_MRU;
1936 * lcp_starting - LCP needs the lower layer up.
1942 link_required(f->unit);
1947 * lcp_finished - LCP has finished with the lower layer.
1953 link_terminated(f->unit);
1958 * lcp_printpkt - print the contents of an LCP packet.
1960 static char *lcp_codenames[] = {
1961 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1962 "TermReq", "TermAck", "CodeRej", "ProtRej",
1963 "EchoReq", "EchoRep", "DiscReq"
1967 lcp_printpkt(p, plen, printer, arg)
1970 void (*printer) __P((void *, char *, ...));
1973 int code, id, len, olen, i;
1974 u_char *pstart, *optend;
1978 if (plen < HEADERLEN)
1984 if (len < HEADERLEN || len > plen)
1987 if (code >= 1 && code <= sizeof(lcp_codenames) / sizeof(char *))
1988 printer(arg, " %s", lcp_codenames[code-1]);
1990 printer(arg, " code=0x%x", code);
1991 printer(arg, " id=0x%x", id);
1998 /* print option list */
2003 if (olen < 2 || olen > len) {
2011 if (olen == CILEN_SHORT) {
2013 GETSHORT(cishort, p);
2014 printer(arg, "mru %d", cishort);
2018 if (olen == CILEN_LONG) {
2021 printer(arg, "asyncmap 0x%x", cilong);
2025 if (olen >= CILEN_SHORT) {
2027 printer(arg, "auth ");
2028 GETSHORT(cishort, p);
2031 printer(arg, "pap");
2034 printer(arg, "chap");
2037 case CHAP_DIGEST_MD5:
2038 printer(arg, " MD5");
2042 case CHAP_MICROSOFT:
2043 printer(arg, " MS");
2047 case CHAP_MICROSOFT_V2:
2048 printer(arg, " MS-v2");
2056 printer(arg, "eap");
2059 printer(arg, "0x%x", cishort);
2064 if (olen >= CILEN_SHORT) {
2066 printer(arg, "quality ");
2067 GETSHORT(cishort, p);
2070 printer(arg, "lqr");
2073 printer(arg, "0x%x", cishort);
2078 if (olen >= CILEN_CHAR) {
2080 printer(arg, "callback ");
2081 GETCHAR(cishort, p);
2084 printer(arg, "CBCP");
2087 printer(arg, "0x%x", cishort);
2091 case CI_MAGICNUMBER:
2092 if (olen == CILEN_LONG) {
2095 printer(arg, "magic 0x%x", cilong);
2098 case CI_PCOMPRESSION:
2099 if (olen == CILEN_VOID) {
2101 printer(arg, "pcomp");
2104 case CI_ACCOMPRESSION:
2105 if (olen == CILEN_VOID) {
2107 printer(arg, "accomp");
2111 if (olen == CILEN_SHORT) {
2113 GETSHORT(cishort, p);
2114 printer(arg, "mrru %d", cishort);
2118 if (olen == CILEN_VOID) {
2120 printer(arg, "ssnhf");
2124 #ifdef HAVE_MULTILINK
2125 if (olen >= CILEN_CHAR) {
2128 GETCHAR(epd.class, p);
2129 epd.length = olen - CILEN_CHAR;
2130 if (epd.length > MAX_ENDP_LEN)
2131 epd.length = MAX_ENDP_LEN;
2132 if (epd.length > 0) {
2133 BCOPY(p, epd.value, epd.length);
2136 printer(arg, "endpoint [%s]", epdisc_to_str(&epd));
2139 printer(arg, "endpoint");
2143 while (p < optend) {
2145 printer(arg, " %.2x", code);
2153 if (len > 0 && *p >= ' ' && *p < 0x7f) {
2155 print_string((char *)p, len, printer, arg);
2166 printer(arg, " magic=0x%x", cilong);
2173 /* print the rest of the bytes in the packet */
2174 for (i = 0; i < len && i < 32; ++i) {
2176 printer(arg, " %.2x", code);
2179 printer(arg, " ...");
2187 * Time to shut down the link because there is nothing out there.
2191 void LcpLinkFailure (f)
2194 if (f->state == OPENED) {
2195 info("No response to %d echo-requests", lcp_echos_pending);
2196 notice("Serial link appears to be disconnected.");
2197 lcp_close(f->unit, "Peer not responding");
2198 status = EXIT_PEER_DEAD;
2203 * Timer expired for the LCP echo requests from this process.
2210 LcpSendEchoRequest (f);
2211 if (f->state != OPENED)
2215 * Start the timer for the next interval.
2217 if (lcp_echo_timer_running)
2218 warn("assertion lcp_echo_timer_running==0 failed");
2219 TIMEOUT (LcpEchoTimeout, f, lcp_echo_interval);
2220 lcp_echo_timer_running = 1;
2224 * LcpEchoTimeout - Timer expired on the LCP echo
2228 LcpEchoTimeout (arg)
2231 if (lcp_echo_timer_running != 0) {
2232 lcp_echo_timer_running = 0;
2233 LcpEchoCheck ((fsm *) arg);
2238 * LcpEchoReply - LCP has received a reply to the echo
2242 lcp_received_echo_reply (f, id, inp, len)
2250 /* Check the magic number - don't count replies from ourselves. */
2252 dbglog("lcp: received short Echo-Reply, length %d", len);
2255 GETLONG(magic, inp);
2256 if (lcp_gotoptions[f->unit].neg_magicnumber
2257 && magic == lcp_gotoptions[f->unit].magicnumber) {
2258 warn("appear to have received our own echo-reply!");
2262 /* Reset the number of outstanding echo frames */
2263 lcp_echos_pending = 0;
2267 * LcpSendEchoRequest - Send an echo request frame to the peer
2271 LcpSendEchoRequest (f)
2274 u_int32_t lcp_magic;
2275 u_char pkt[4], *pktp;
2278 * Detect the failure of the peer at this point.
2280 if (lcp_echo_fails != 0) {
2281 if (lcp_echos_pending >= lcp_echo_fails) {
2283 lcp_echos_pending = 0;
2288 * Make and send the echo request frame.
2290 if (f->state == OPENED) {
2291 lcp_magic = lcp_gotoptions[f->unit].magicnumber;
2293 PUTLONG(lcp_magic, pktp);
2294 fsm_sdata(f, ECHOREQ, lcp_echo_number++ & 0xFF, pkt, pktp - pkt);
2295 ++lcp_echos_pending;
2300 * lcp_echo_lowerup - Start the timer for the LCP frame
2304 lcp_echo_lowerup (unit)
2307 fsm *f = &lcp_fsm[unit];
2309 /* Clear the parameters for generating echo frames */
2310 lcp_echos_pending = 0;
2311 lcp_echo_number = 0;
2312 lcp_echo_timer_running = 0;
2314 /* If a timeout interval is specified then start the timer */
2315 if (lcp_echo_interval != 0)
2320 * lcp_echo_lowerdown - Stop the timer for the LCP frame
2324 lcp_echo_lowerdown (unit)
2327 fsm *f = &lcp_fsm[unit];
2329 if (lcp_echo_timer_running != 0) {
2330 UNTIMEOUT (LcpEchoTimeout, f);
2331 lcp_echo_timer_running = 0;