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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11 * notice, this list of conditions and the following disclaimer.
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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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19 * endorse or promote products derived from this software without
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21 * details, please contact
22 * Office of Technology Transfer
23 * Carnegie Mellon University
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31 * "This product includes software developed by Computing Services
32 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
34 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
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36 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
37 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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43 #define RCSID "$Id: lcp.c,v 1.76 2006/05/22 00:04:07 paulus 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, 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 = chap_mdtype_all;
365 ao->neg_magicnumber = 1;
366 ao->neg_pcompression = 1;
367 ao->neg_accompression = 1;
368 ao->neg_endpoint = 1;
373 * lcp_open - LCP is allowed to come up.
379 fsm *f = &lcp_fsm[unit];
380 lcp_options *wo = &lcp_wantoptions[unit];
382 f->flags &= ~(OPT_PASSIVE | OPT_SILENT);
384 f->flags |= OPT_PASSIVE;
386 f->flags |= OPT_SILENT;
392 * lcp_close - Take LCP down.
395 lcp_close(unit, reason)
399 fsm *f = &lcp_fsm[unit];
401 if (phase != PHASE_DEAD && phase != PHASE_MASTER)
402 new_phase(PHASE_TERMINATE);
403 if (f->state == STOPPED && f->flags & (OPT_PASSIVE|OPT_SILENT)) {
405 * This action is not strictly according to the FSM in RFC1548,
406 * but it does mean that the program terminates if you do a
407 * lcp_close() in passive/silent mode when a connection hasn't
414 fsm_close(f, reason);
419 * lcp_lowerup - The lower layer is up.
425 lcp_options *wo = &lcp_wantoptions[unit];
426 fsm *f = &lcp_fsm[unit];
429 * Don't use A/C or protocol compression on transmission,
430 * but accept A/C and protocol compressed packets
431 * if we are going to ask for A/C and protocol compression.
433 if (ppp_send_config(unit, PPP_MRU, 0xffffffff, 0, 0) < 0
434 || ppp_recv_config(unit, PPP_MRU, (lax_recv? 0: 0xffffffff),
435 wo->neg_pcompression, wo->neg_accompression) < 0)
437 peer_mru[unit] = PPP_MRU;
439 if (listen_time != 0) {
440 f->flags |= DELAYED_UP;
441 timeout(lcp_delayed_up, f, 0, listen_time * 1000);
448 * lcp_lowerdown - The lower layer is down.
454 fsm *f = &lcp_fsm[unit];
456 if (f->flags & DELAYED_UP)
457 f->flags &= ~DELAYED_UP;
459 fsm_lowerdown(&lcp_fsm[unit]);
464 * lcp_delayed_up - Bring the lower layer up now.
472 if (f->flags & DELAYED_UP) {
473 f->flags &= ~DELAYED_UP;
480 * lcp_input - Input LCP packet.
483 lcp_input(unit, p, len)
488 fsm *f = &lcp_fsm[unit];
490 if (f->flags & DELAYED_UP) {
491 f->flags &= ~DELAYED_UP;
494 fsm_input(f, p, len);
498 * lcp_extcode - Handle a LCP-specific code.
501 lcp_extcode(f, code, id, inp, len)
511 lcp_rprotrej(f, inp, len);
515 if (f->state != OPENED)
518 PUTLONG(lcp_gotoptions[f->unit].magicnumber, magp);
519 fsm_sdata(f, ECHOREP, id, inp, len);
523 lcp_received_echo_reply(f, id, inp, len);
539 * lcp_rprotrej - Receive an Protocol-Reject.
541 * Figure out which protocol is rejected and inform it.
544 lcp_rprotrej(f, inp, len)
550 struct protent *protp;
555 LCPDEBUG(("lcp_rprotrej: Rcvd short Protocol-Reject packet!"));
562 * Protocol-Reject packets received in any state other than the LCP
563 * OPENED state SHOULD be silently discarded.
565 if( f->state != OPENED ){
566 LCPDEBUG(("Protocol-Reject discarded: LCP in state %d", f->state));
570 pname = protocol_name(prot);
573 * Upcall the proper Protocol-Reject routine.
575 for (i = 0; (protp = protocols[i]) != NULL; ++i)
576 if (protp->protocol == prot && protp->enabled_flag) {
578 dbglog("Protocol-Reject for 0x%x received", prot);
580 dbglog("Protocol-Reject for '%s' (0x%x) received", pname,
582 (*protp->protrej)(f->unit);
587 warn("Protocol-Reject for unsupported protocol 0x%x", prot);
589 warn("Protocol-Reject for unsupported protocol '%s' (0x%x)", pname,
595 * lcp_protrej - A Protocol-Reject was received.
605 error("Received Protocol-Reject for LCP!");
606 fsm_protreject(&lcp_fsm[unit]);
611 * lcp_sprotrej - Send a Protocol-Reject for some protocol.
614 lcp_sprotrej(unit, p, len)
620 * Send back the protocol and the information field of the
621 * rejected packet. We only get here if LCP is in the OPENED state.
626 fsm_sdata(&lcp_fsm[unit], PROTREJ, ++lcp_fsm[unit].id,
632 * lcp_resetci - Reset our CI.
638 lcp_options *wo = &lcp_wantoptions[f->unit];
639 lcp_options *go = &lcp_gotoptions[f->unit];
640 lcp_options *ao = &lcp_allowoptions[f->unit];
642 wo->magicnumber = magic();
648 go->neg_endpoint = 0;
651 ao->neg_endpoint = 0;
652 peer_mru[f->unit] = PPP_MRU;
658 * lcp_cilen - Return length of our CI.
664 lcp_options *go = &lcp_gotoptions[f->unit];
666 #define LENCIVOID(neg) ((neg) ? CILEN_VOID : 0)
667 #define LENCICHAP(neg) ((neg) ? CILEN_CHAP : 0)
668 #define LENCISHORT(neg) ((neg) ? CILEN_SHORT : 0)
669 #define LENCILONG(neg) ((neg) ? CILEN_LONG : 0)
670 #define LENCILQR(neg) ((neg) ? CILEN_LQR: 0)
671 #define LENCICBCP(neg) ((neg) ? CILEN_CBCP: 0)
673 * NB: we only ask for one of CHAP, UPAP, or EAP, even if we will
674 * accept more than one. We prefer EAP first, then CHAP, then
677 return (LENCISHORT(go->neg_mru && go->mru != DEFMRU) +
678 LENCILONG(go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF) +
679 LENCISHORT(go->neg_eap) +
680 LENCICHAP(!go->neg_eap && go->neg_chap) +
681 LENCISHORT(!go->neg_eap && !go->neg_chap && go->neg_upap) +
682 LENCILQR(go->neg_lqr) +
683 LENCICBCP(go->neg_cbcp) +
684 LENCILONG(go->neg_magicnumber) +
685 LENCIVOID(go->neg_pcompression) +
686 LENCIVOID(go->neg_accompression) +
687 LENCISHORT(go->neg_mrru) +
688 LENCIVOID(go->neg_ssnhf) +
689 (go->neg_endpoint? CILEN_CHAR + go->endpoint.length: 0));
694 * lcp_addci - Add our desired CIs to a packet.
697 lcp_addci(f, ucp, lenp)
702 lcp_options *go = &lcp_gotoptions[f->unit];
703 u_char *start_ucp = ucp;
705 #define ADDCIVOID(opt, neg) \
708 PUTCHAR(CILEN_VOID, ucp); \
710 #define ADDCISHORT(opt, neg, val) \
713 PUTCHAR(CILEN_SHORT, ucp); \
714 PUTSHORT(val, ucp); \
716 #define ADDCICHAP(opt, neg, val) \
718 PUTCHAR((opt), ucp); \
719 PUTCHAR(CILEN_CHAP, ucp); \
720 PUTSHORT(PPP_CHAP, ucp); \
721 PUTCHAR((CHAP_DIGEST(val)), ucp); \
723 #define ADDCILONG(opt, neg, val) \
726 PUTCHAR(CILEN_LONG, ucp); \
729 #define ADDCILQR(opt, neg, val) \
732 PUTCHAR(CILEN_LQR, ucp); \
733 PUTSHORT(PPP_LQR, ucp); \
736 #define ADDCICHAR(opt, neg, val) \
739 PUTCHAR(CILEN_CHAR, ucp); \
742 #define ADDCIENDP(opt, neg, class, val, len) \
746 PUTCHAR(CILEN_CHAR + len, ucp); \
747 PUTCHAR(class, ucp); \
748 for (i = 0; i < len; ++i) \
749 PUTCHAR(val[i], ucp); \
752 ADDCISHORT(CI_MRU, go->neg_mru && go->mru != DEFMRU, go->mru);
753 ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF,
755 ADDCISHORT(CI_AUTHTYPE, go->neg_eap, PPP_EAP);
756 ADDCICHAP(CI_AUTHTYPE, !go->neg_eap && go->neg_chap, go->chap_mdtype);
757 ADDCISHORT(CI_AUTHTYPE, !go->neg_eap && !go->neg_chap && go->neg_upap,
759 ADDCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
760 ADDCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
761 ADDCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
762 ADDCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
763 ADDCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
764 ADDCISHORT(CI_MRRU, go->neg_mrru, go->mrru);
765 ADDCIVOID(CI_SSNHF, go->neg_ssnhf);
766 ADDCIENDP(CI_EPDISC, go->neg_endpoint, go->endpoint.class,
767 go->endpoint.value, go->endpoint.length);
769 if (ucp - start_ucp != *lenp) {
770 /* this should never happen, because peer_mtu should be 1500 */
771 error("Bug in lcp_addci: wrong length");
777 * lcp_ackci - Ack our CIs.
778 * This should not modify any state if the Ack is bad.
790 lcp_options *go = &lcp_gotoptions[f->unit];
791 u_char cilen, citype, cichar;
796 * CIs must be in exactly the same order that we sent.
797 * Check packet length and CI length at each step.
798 * If we find any deviations, then this packet is bad.
800 #define ACKCIVOID(opt, neg) \
802 if ((len -= CILEN_VOID) < 0) \
804 GETCHAR(citype, p); \
806 if (cilen != CILEN_VOID || \
810 #define ACKCISHORT(opt, neg, val) \
812 if ((len -= CILEN_SHORT) < 0) \
814 GETCHAR(citype, p); \
816 if (cilen != CILEN_SHORT || \
819 GETSHORT(cishort, p); \
820 if (cishort != val) \
823 #define ACKCICHAR(opt, neg, val) \
825 if ((len -= CILEN_CHAR) < 0) \
827 GETCHAR(citype, p); \
829 if (cilen != CILEN_CHAR || \
832 GETCHAR(cichar, p); \
836 #define ACKCICHAP(opt, neg, val) \
838 if ((len -= CILEN_CHAP) < 0) \
840 GETCHAR(citype, p); \
842 if (cilen != CILEN_CHAP || \
845 GETSHORT(cishort, p); \
846 if (cishort != PPP_CHAP) \
848 GETCHAR(cichar, p); \
849 if (cichar != (CHAP_DIGEST(val))) \
852 #define ACKCILONG(opt, neg, val) \
854 if ((len -= CILEN_LONG) < 0) \
856 GETCHAR(citype, p); \
858 if (cilen != CILEN_LONG || \
861 GETLONG(cilong, p); \
865 #define ACKCILQR(opt, neg, val) \
867 if ((len -= CILEN_LQR) < 0) \
869 GETCHAR(citype, p); \
871 if (cilen != CILEN_LQR || \
874 GETSHORT(cishort, p); \
875 if (cishort != PPP_LQR) \
877 GETLONG(cilong, p); \
881 #define ACKCIENDP(opt, neg, class, val, vlen) \
884 if ((len -= CILEN_CHAR + vlen) < 0) \
886 GETCHAR(citype, p); \
888 if (cilen != CILEN_CHAR + vlen || \
891 GETCHAR(cichar, p); \
892 if (cichar != class) \
894 for (i = 0; i < vlen; ++i) { \
895 GETCHAR(cichar, p); \
896 if (cichar != val[i]) \
901 ACKCISHORT(CI_MRU, go->neg_mru && go->mru != DEFMRU, go->mru);
902 ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF,
904 ACKCISHORT(CI_AUTHTYPE, go->neg_eap, PPP_EAP);
905 ACKCICHAP(CI_AUTHTYPE, !go->neg_eap && go->neg_chap, go->chap_mdtype);
906 ACKCISHORT(CI_AUTHTYPE, !go->neg_eap && !go->neg_chap && go->neg_upap,
908 ACKCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
909 ACKCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
910 ACKCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
911 ACKCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
912 ACKCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
913 ACKCISHORT(CI_MRRU, go->neg_mrru, go->mrru);
914 ACKCIVOID(CI_SSNHF, go->neg_ssnhf);
915 ACKCIENDP(CI_EPDISC, go->neg_endpoint, go->endpoint.class,
916 go->endpoint.value, go->endpoint.length);
919 * If there are any remaining CIs, then this packet is bad.
925 LCPDEBUG(("lcp_acki: received bad Ack!"));
931 * lcp_nakci - Peer has sent a NAK for some of our CIs.
932 * This should not modify any state if the Nak is bad
933 * or if LCP is in the OPENED state.
940 lcp_nakci(f, p, len, treat_as_reject)
946 lcp_options *go = &lcp_gotoptions[f->unit];
947 lcp_options *wo = &lcp_wantoptions[f->unit];
948 u_char citype, cichar, *next;
951 lcp_options no; /* options we've seen Naks for */
952 lcp_options try; /* options to request next time */
956 BZERO(&no, sizeof(no));
960 * Any Nak'd CIs must be in exactly the same order that we sent.
961 * Check packet length and CI length at each step.
962 * If we find any deviations, then this packet is bad.
964 #define NAKCIVOID(opt, neg) \
966 len >= CILEN_VOID && \
967 p[1] == CILEN_VOID && \
970 INCPTR(CILEN_VOID, p); \
974 #define NAKCICHAP(opt, neg, code) \
976 len >= CILEN_CHAP && \
977 p[1] == CILEN_CHAP && \
981 GETSHORT(cishort, p); \
982 GETCHAR(cichar, p); \
986 #define NAKCICHAR(opt, neg, code) \
988 len >= CILEN_CHAR && \
989 p[1] == CILEN_CHAR && \
993 GETCHAR(cichar, p); \
997 #define NAKCISHORT(opt, neg, code) \
999 len >= CILEN_SHORT && \
1000 p[1] == CILEN_SHORT && \
1002 len -= CILEN_SHORT; \
1004 GETSHORT(cishort, p); \
1008 #define NAKCILONG(opt, neg, code) \
1010 len >= CILEN_LONG && \
1011 p[1] == CILEN_LONG && \
1013 len -= CILEN_LONG; \
1015 GETLONG(cilong, p); \
1019 #define NAKCILQR(opt, neg, code) \
1021 len >= CILEN_LQR && \
1022 p[1] == CILEN_LQR && \
1026 GETSHORT(cishort, p); \
1027 GETLONG(cilong, p); \
1031 #define NAKCIENDP(opt, neg) \
1033 len >= CILEN_CHAR && \
1035 p[1] >= CILEN_CHAR && \
1044 * NOTE! There must be no assignments to individual fields of *go in
1045 * the code below. Any such assignment is a BUG!
1048 * We don't care if they want to send us smaller packets than
1049 * we want. Therefore, accept any MRU less than what we asked for,
1050 * but then ignore the new value when setting the MRU in the kernel.
1051 * If they send us a bigger MRU than what we asked, accept it, up to
1052 * the limit of the default MRU we'd get if we didn't negotiate.
1054 if (go->neg_mru && go->mru != DEFMRU) {
1055 NAKCISHORT(CI_MRU, neg_mru,
1056 if (cishort <= wo->mru || cishort <= DEFMRU)
1062 * Add any characters they want to our (receive-side) asyncmap.
1064 if (go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF) {
1065 NAKCILONG(CI_ASYNCMAP, neg_asyncmap,
1066 try.asyncmap = go->asyncmap | cilong;
1071 * If they've nak'd our authentication-protocol, check whether
1072 * they are proposing a different protocol, or a different
1073 * hash algorithm for CHAP.
1075 if ((go->neg_chap || go->neg_upap || go->neg_eap)
1076 && len >= CILEN_SHORT
1077 && p[0] == CI_AUTHTYPE && p[1] >= CILEN_SHORT && p[1] <= len) {
1080 no.neg_chap = go->neg_chap;
1081 no.neg_upap = go->neg_upap;
1082 no.neg_eap = go->neg_eap;
1084 GETSHORT(cishort, p);
1085 if (cishort == PPP_PAP && cilen == CILEN_SHORT) {
1086 /* If we were asking for EAP, then we need to stop that. */
1090 /* If we were asking for CHAP, then we need to stop that. */
1091 else if (go->neg_chap)
1094 * If we weren't asking for CHAP or EAP, then we were asking for
1095 * PAP, in which case this Nak is bad.
1100 } else if (cishort == PPP_CHAP && cilen == CILEN_CHAP) {
1102 /* Stop asking for EAP, if we were. */
1105 /* Try to set up to use their suggestion, if possible */
1106 if (CHAP_CANDIGEST(go->chap_mdtype, cichar))
1107 try.chap_mdtype = CHAP_MDTYPE_D(cichar);
1108 } else if (go->neg_chap) {
1110 * We were asking for our preferred algorithm, they must
1111 * want something different.
1113 if (cichar != CHAP_DIGEST(go->chap_mdtype)) {
1114 if (CHAP_CANDIGEST(go->chap_mdtype, cichar)) {
1115 /* Use their suggestion if we support it ... */
1116 try.chap_mdtype = CHAP_MDTYPE_D(cichar);
1118 /* ... otherwise, try our next-preferred algorithm. */
1119 try.chap_mdtype &= ~(CHAP_MDTYPE(try.chap_mdtype));
1120 if (try.chap_mdtype == MDTYPE_NONE) /* out of algos */
1125 * Whoops, they Nak'd our algorithm of choice
1126 * but then suggested it back to us.
1132 * Stop asking for PAP if we were asking for it.
1140 * If we were asking for EAP, and they're Conf-Naking EAP,
1141 * well, that's just strange. Nobody should do that.
1143 if (cishort == PPP_EAP && cilen == CILEN_SHORT && go->neg_eap)
1144 dbglog("Unexpected Conf-Nak for EAP");
1147 * We don't recognize what they're suggesting.
1148 * Stop asking for what we were asking for.
1152 else if (go->neg_chap)
1156 p += cilen - CILEN_SHORT;
1161 * If they can't cope with our link quality protocol, we'll have
1162 * to stop asking for LQR. We haven't got any other protocol.
1163 * If they Nak the reporting period, take their value XXX ?
1165 NAKCILQR(CI_QUALITY, neg_lqr,
1166 if (cishort != PPP_LQR)
1169 try.lqr_period = cilong;
1173 * Only implementing CBCP...not the rest of the callback options
1175 NAKCICHAR(CI_CALLBACK, neg_cbcp,
1180 * Check for a looped-back line.
1182 NAKCILONG(CI_MAGICNUMBER, neg_magicnumber,
1183 try.magicnumber = magic();
1188 * Peer shouldn't send Nak for protocol compression or
1189 * address/control compression requests; they should send
1190 * a Reject instead. If they send a Nak, treat it as a Reject.
1192 NAKCIVOID(CI_PCOMPRESSION, neg_pcompression);
1193 NAKCIVOID(CI_ACCOMPRESSION, neg_accompression);
1196 * Nak for MRRU option - accept their value if it is smaller
1197 * than the one we want.
1200 NAKCISHORT(CI_MRRU, neg_mrru,
1201 if (treat_as_reject)
1203 else if (cishort <= wo->mrru)
1209 * Nak for short sequence numbers shouldn't be sent, treat it
1212 NAKCIVOID(CI_SSNHF, neg_ssnhf);
1215 * Nak of the endpoint discriminator option is not permitted,
1216 * treat it like a reject.
1218 NAKCIENDP(CI_EPDISC, neg_endpoint);
1221 * There may be remaining CIs, if the peer is requesting negotiation
1222 * on an option that we didn't include in our request packet.
1223 * If we see an option that we requested, or one we've already seen
1224 * in this packet, then this packet is bad.
1225 * If we wanted to respond by starting to negotiate on the requested
1226 * option(s), we could, but we don't, because except for the
1227 * authentication type and quality protocol, if we are not negotiating
1228 * an option, it is because we were told not to.
1229 * For the authentication type, the Nak from the peer means
1230 * `let me authenticate myself with you' which is a bit pointless.
1231 * For the quality protocol, the Nak means `ask me to send you quality
1232 * reports', but if we didn't ask for them, we don't want them.
1233 * An option we don't recognize represents the peer asking to
1234 * negotiate some option we don't support, so ignore it.
1236 while (len >= CILEN_VOID) {
1239 if (cilen < CILEN_VOID || (len -= cilen) < 0)
1241 next = p + cilen - 2;
1245 if ((go->neg_mru && go->mru != DEFMRU)
1246 || no.neg_mru || cilen != CILEN_SHORT)
1248 GETSHORT(cishort, p);
1249 if (cishort < DEFMRU) {
1255 if ((go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF)
1256 || no.neg_asyncmap || cilen != CILEN_LONG)
1260 if (go->neg_chap || no.neg_chap || go->neg_upap || no.neg_upap ||
1261 go->neg_eap || no.neg_eap)
1264 case CI_MAGICNUMBER:
1265 if (go->neg_magicnumber || no.neg_magicnumber ||
1266 cilen != CILEN_LONG)
1269 case CI_PCOMPRESSION:
1270 if (go->neg_pcompression || no.neg_pcompression
1271 || cilen != CILEN_VOID)
1274 case CI_ACCOMPRESSION:
1275 if (go->neg_accompression || no.neg_accompression
1276 || cilen != CILEN_VOID)
1280 if (go->neg_lqr || no.neg_lqr || cilen != CILEN_LQR)
1284 if (go->neg_mrru || no.neg_mrru || cilen != CILEN_SHORT)
1288 if (go->neg_ssnhf || no.neg_ssnhf || cilen != CILEN_VOID)
1293 if (go->neg_endpoint || no.neg_endpoint || cilen < CILEN_CHAR)
1301 * OK, the Nak is good. Now we can update state.
1302 * If there are any options left we ignore them.
1304 if (f->state != OPENED) {
1306 if (++try.numloops >= lcp_loopbackfail) {
1307 notice("Serial line is looped back.");
1308 status = EXIT_LOOPBACK;
1309 lcp_close(f->unit, "Loopback detected");
1319 LCPDEBUG(("lcp_nakci: received bad Nak!"));
1325 * lcp_rejci - Peer has Rejected some of our CIs.
1326 * This should not modify any state if the Reject is bad
1327 * or if LCP is in the OPENED state.
1330 * 0 - Reject was bad.
1331 * 1 - Reject was good.
1334 lcp_rejci(f, p, len)
1339 lcp_options *go = &lcp_gotoptions[f->unit];
1343 lcp_options try; /* options to request next time */
1348 * Any Rejected CIs must be in exactly the same order that we sent.
1349 * Check packet length and CI length at each step.
1350 * If we find any deviations, then this packet is bad.
1352 #define REJCIVOID(opt, neg) \
1354 len >= CILEN_VOID && \
1355 p[1] == CILEN_VOID && \
1357 len -= CILEN_VOID; \
1358 INCPTR(CILEN_VOID, p); \
1361 #define REJCISHORT(opt, neg, val) \
1363 len >= CILEN_SHORT && \
1364 p[1] == CILEN_SHORT && \
1366 len -= CILEN_SHORT; \
1368 GETSHORT(cishort, p); \
1369 /* Check rejected value. */ \
1370 if (cishort != val) \
1374 #define REJCICHAP(opt, neg, val) \
1376 len >= CILEN_CHAP && \
1377 p[1] == CILEN_CHAP && \
1379 len -= CILEN_CHAP; \
1381 GETSHORT(cishort, p); \
1382 GETCHAR(cichar, p); \
1383 /* Check rejected value. */ \
1384 if ((cishort != PPP_CHAP) || (cichar != (CHAP_DIGEST(val)))) \
1387 try.neg_eap = try.neg_upap = 0; \
1389 #define REJCILONG(opt, neg, val) \
1391 len >= CILEN_LONG && \
1392 p[1] == CILEN_LONG && \
1394 len -= CILEN_LONG; \
1396 GETLONG(cilong, p); \
1397 /* Check rejected value. */ \
1398 if (cilong != val) \
1402 #define REJCILQR(opt, neg, val) \
1404 len >= CILEN_LQR && \
1405 p[1] == CILEN_LQR && \
1409 GETSHORT(cishort, p); \
1410 GETLONG(cilong, p); \
1411 /* Check rejected value. */ \
1412 if (cishort != PPP_LQR || cilong != val) \
1416 #define REJCICBCP(opt, neg, val) \
1418 len >= CILEN_CBCP && \
1419 p[1] == CILEN_CBCP && \
1421 len -= CILEN_CBCP; \
1423 GETCHAR(cichar, p); \
1424 /* Check rejected value. */ \
1425 if (cichar != val) \
1429 #define REJCIENDP(opt, neg, class, val, vlen) \
1431 len >= CILEN_CHAR + vlen && \
1433 p[1] == CILEN_CHAR + vlen) { \
1435 len -= CILEN_CHAR + vlen; \
1437 GETCHAR(cichar, p); \
1438 if (cichar != class) \
1440 for (i = 0; i < vlen; ++i) { \
1441 GETCHAR(cichar, p); \
1442 if (cichar != val[i]) \
1448 REJCISHORT(CI_MRU, neg_mru, go->mru);
1449 REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap);
1450 REJCISHORT(CI_AUTHTYPE, neg_eap, PPP_EAP);
1452 REJCICHAP(CI_AUTHTYPE, neg_chap, go->chap_mdtype);
1453 if (!go->neg_chap) {
1454 REJCISHORT(CI_AUTHTYPE, neg_upap, PPP_PAP);
1457 REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period);
1458 REJCICBCP(CI_CALLBACK, neg_cbcp, CBCP_OPT);
1459 REJCILONG(CI_MAGICNUMBER, neg_magicnumber, go->magicnumber);
1460 REJCIVOID(CI_PCOMPRESSION, neg_pcompression);
1461 REJCIVOID(CI_ACCOMPRESSION, neg_accompression);
1462 REJCISHORT(CI_MRRU, neg_mrru, go->mrru);
1463 REJCIVOID(CI_SSNHF, neg_ssnhf);
1464 REJCIENDP(CI_EPDISC, neg_endpoint, go->endpoint.class,
1465 go->endpoint.value, go->endpoint.length);
1468 * If there are any remaining CIs, then this packet is bad.
1473 * Now we can update state.
1475 if (f->state != OPENED)
1480 LCPDEBUG(("lcp_rejci: received bad Reject!"));
1486 * lcp_reqci - Check the peer's requested CIs and send appropriate response.
1488 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1489 * appropriately. If reject_if_disagree is non-zero, doesn't return
1490 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1493 lcp_reqci(f, inp, lenp, reject_if_disagree)
1495 u_char *inp; /* Requested CIs */
1496 int *lenp; /* Length of requested CIs */
1497 int reject_if_disagree;
1499 lcp_options *go = &lcp_gotoptions[f->unit];
1500 lcp_options *ho = &lcp_hisoptions[f->unit];
1501 lcp_options *ao = &lcp_allowoptions[f->unit];
1502 u_char *cip, *next; /* Pointer to current and next CIs */
1503 int cilen, citype, cichar; /* Parsed len, type, char value */
1504 u_short cishort; /* Parsed short value */
1505 u_int32_t cilong; /* Parse long value */
1506 int rc = CONFACK; /* Final packet return code */
1507 int orc; /* Individual option return code */
1508 u_char *p; /* Pointer to next char to parse */
1509 u_char *rejp; /* Pointer to next char in reject frame */
1510 u_char *nakp; /* Pointer to next char in Nak frame */
1511 int l = *lenp; /* Length left */
1514 * Reset all his options.
1516 BZERO(ho, sizeof(*ho));
1519 * Process all his options.
1525 orc = CONFACK; /* Assume success */
1526 cip = p = next; /* Remember begining of CI */
1527 if (l < 2 || /* Not enough data for CI header or */
1528 p[1] < 2 || /* CI length too small or */
1529 p[1] > l) { /* CI length too big? */
1530 LCPDEBUG(("lcp_reqci: bad CI length!"));
1531 orc = CONFREJ; /* Reject bad CI */
1532 cilen = l; /* Reject till end of packet */
1533 l = 0; /* Don't loop again */
1537 GETCHAR(citype, p); /* Parse CI type */
1538 GETCHAR(cilen, p); /* Parse CI length */
1539 l -= cilen; /* Adjust remaining length */
1540 next += cilen; /* Step to next CI */
1542 switch (citype) { /* Check CI type */
1544 if (!ao->neg_mru || /* Allow option? */
1545 cilen != CILEN_SHORT) { /* Check CI length */
1546 orc = CONFREJ; /* Reject CI */
1549 GETSHORT(cishort, p); /* Parse MRU */
1552 * He must be able to receive at least our minimum.
1553 * No need to check a maximum. If he sends a large number,
1554 * we'll just ignore it.
1556 if (cishort < MINMRU) {
1557 orc = CONFNAK; /* Nak CI */
1558 PUTCHAR(CI_MRU, nakp);
1559 PUTCHAR(CILEN_SHORT, nakp);
1560 PUTSHORT(MINMRU, nakp); /* Give him a hint */
1563 ho->neg_mru = 1; /* Remember he sent MRU */
1564 ho->mru = cishort; /* And remember value */
1568 if (!ao->neg_asyncmap ||
1569 cilen != CILEN_LONG) {
1576 * Asyncmap must have set at least the bits
1577 * which are set in lcp_allowoptions[unit].asyncmap.
1579 if ((ao->asyncmap & ~cilong) != 0) {
1581 PUTCHAR(CI_ASYNCMAP, nakp);
1582 PUTCHAR(CILEN_LONG, nakp);
1583 PUTLONG(ao->asyncmap | cilong, nakp);
1586 ho->neg_asyncmap = 1;
1587 ho->asyncmap = cilong;
1591 if (cilen < CILEN_SHORT ||
1592 !(ao->neg_upap || ao->neg_chap || ao->neg_eap)) {
1594 * Reject the option if we're not willing to authenticate.
1596 dbglog("No auth is possible");
1600 GETSHORT(cishort, p);
1603 * Authtype must be PAP, CHAP, or EAP.
1605 * Note: if more than one of ao->neg_upap, ao->neg_chap, and
1606 * ao->neg_eap are set, and the peer sends a Configure-Request
1607 * with two or more authenticate-protocol requests, then we will
1608 * reject the second request.
1609 * Whether we end up doing CHAP, UPAP, or EAP depends then on
1610 * the ordering of the CIs in the peer's Configure-Request.
1613 if (cishort == PPP_PAP) {
1614 /* we've already accepted CHAP or EAP */
1615 if (ho->neg_chap || ho->neg_eap ||
1616 cilen != CILEN_SHORT) {
1617 LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE PAP, rejecting..."));
1621 if (!ao->neg_upap) { /* we don't want to do PAP */
1622 orc = CONFNAK; /* NAK it and suggest CHAP or EAP */
1623 PUTCHAR(CI_AUTHTYPE, nakp);
1625 PUTCHAR(CILEN_SHORT, nakp);
1626 PUTSHORT(PPP_EAP, nakp);
1628 PUTCHAR(CILEN_CHAP, nakp);
1629 PUTSHORT(PPP_CHAP, nakp);
1630 PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakp);
1637 if (cishort == PPP_CHAP) {
1638 /* we've already accepted PAP or EAP */
1639 if (ho->neg_upap || ho->neg_eap ||
1640 cilen != CILEN_CHAP) {
1641 LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE CHAP, rejecting..."));
1645 if (!ao->neg_chap) { /* we don't want to do CHAP */
1646 orc = CONFNAK; /* NAK it and suggest EAP or PAP */
1647 PUTCHAR(CI_AUTHTYPE, nakp);
1648 PUTCHAR(CILEN_SHORT, nakp);
1650 PUTSHORT(PPP_EAP, nakp);
1652 PUTSHORT(PPP_PAP, nakp);
1656 GETCHAR(cichar, p); /* get digest type */
1657 if (!(CHAP_CANDIGEST(ao->chap_mdtype, cichar))) {
1659 * We can't/won't do the requested type,
1660 * suggest something else.
1663 PUTCHAR(CI_AUTHTYPE, nakp);
1664 PUTCHAR(CILEN_CHAP, nakp);
1665 PUTSHORT(PPP_CHAP, nakp);
1666 PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakp);
1669 ho->chap_mdtype = CHAP_MDTYPE_D(cichar); /* save md type */
1673 if (cishort == PPP_EAP) {
1674 /* we've already accepted CHAP or PAP */
1675 if (ho->neg_chap || ho->neg_upap || cilen != CILEN_SHORT) {
1676 LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE EAP, rejecting..."));
1680 if (!ao->neg_eap) { /* we don't want to do EAP */
1681 orc = CONFNAK; /* NAK it and suggest CHAP or PAP */
1682 PUTCHAR(CI_AUTHTYPE, nakp);
1684 PUTCHAR(CILEN_CHAP, nakp);
1685 PUTSHORT(PPP_CHAP, nakp);
1686 PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakp);
1688 PUTCHAR(CILEN_SHORT, nakp);
1689 PUTSHORT(PPP_PAP, nakp);
1698 * We don't recognize the protocol they're asking for.
1699 * Nak it with something we're willing to do.
1700 * (At this point we know ao->neg_upap || ao->neg_chap ||
1704 PUTCHAR(CI_AUTHTYPE, nakp);
1706 PUTCHAR(CILEN_SHORT, nakp);
1707 PUTSHORT(PPP_EAP, nakp);
1708 } else if (ao->neg_chap) {
1709 PUTCHAR(CILEN_CHAP, nakp);
1710 PUTSHORT(PPP_CHAP, nakp);
1711 PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakp);
1713 PUTCHAR(CILEN_SHORT, nakp);
1714 PUTSHORT(PPP_PAP, nakp);
1720 cilen != CILEN_LQR) {
1725 GETSHORT(cishort, p);
1729 * Check the protocol and the reporting period.
1730 * XXX When should we Nak this, and what with?
1732 if (cishort != PPP_LQR) {
1734 PUTCHAR(CI_QUALITY, nakp);
1735 PUTCHAR(CILEN_LQR, nakp);
1736 PUTSHORT(PPP_LQR, nakp);
1737 PUTLONG(ao->lqr_period, nakp);
1742 case CI_MAGICNUMBER:
1743 if (!(ao->neg_magicnumber || go->neg_magicnumber) ||
1744 cilen != CILEN_LONG) {
1751 * He must have a different magic number.
1753 if (go->neg_magicnumber &&
1754 cilong == go->magicnumber) {
1755 cilong = magic(); /* Don't put magic() inside macro! */
1757 PUTCHAR(CI_MAGICNUMBER, nakp);
1758 PUTCHAR(CILEN_LONG, nakp);
1759 PUTLONG(cilong, nakp);
1762 ho->neg_magicnumber = 1;
1763 ho->magicnumber = cilong;
1767 case CI_PCOMPRESSION:
1768 if (!ao->neg_pcompression ||
1769 cilen != CILEN_VOID) {
1773 ho->neg_pcompression = 1;
1776 case CI_ACCOMPRESSION:
1777 if (!ao->neg_accompression ||
1778 cilen != CILEN_VOID) {
1782 ho->neg_accompression = 1;
1786 if (!ao->neg_mrru || !multilink ||
1787 cilen != CILEN_SHORT) {
1792 GETSHORT(cishort, p);
1793 /* possibly should insist on a minimum/maximum MRRU here */
1799 if (!ao->neg_ssnhf || !multilink ||
1800 cilen != CILEN_VOID) {
1808 if (!ao->neg_endpoint ||
1809 cilen < CILEN_CHAR ||
1810 cilen > CILEN_CHAR + MAX_ENDP_LEN) {
1815 cilen -= CILEN_CHAR;
1816 ho->neg_endpoint = 1;
1817 ho->endpoint.class = cichar;
1818 ho->endpoint.length = cilen;
1819 BCOPY(p, ho->endpoint.value, cilen);
1824 LCPDEBUG(("lcp_reqci: rcvd unknown option %d", citype));
1830 if (orc == CONFACK && /* Good CI */
1831 rc != CONFACK) /* but prior CI wasnt? */
1832 continue; /* Don't send this one */
1834 if (orc == CONFNAK) { /* Nak this CI? */
1835 if (reject_if_disagree /* Getting fed up with sending NAKs? */
1836 && citype != CI_MAGICNUMBER) {
1837 orc = CONFREJ; /* Get tough if so */
1839 if (rc == CONFREJ) /* Rejecting prior CI? */
1840 continue; /* Don't send this one */
1844 if (orc == CONFREJ) { /* Reject this CI */
1846 if (cip != rejp) /* Need to move rejected CI? */
1847 BCOPY(cip, rejp, cilen); /* Move it */
1848 INCPTR(cilen, rejp); /* Update output pointer */
1853 * If we wanted to send additional NAKs (for unsent CIs), the
1854 * code would go here. The extra NAKs would go at *nakp.
1855 * At present there are no cases where we want to ask the
1856 * peer to negotiate an option.
1865 * Copy the Nak'd options from the nak_buffer to the caller's buffer.
1867 *lenp = nakp - nak_buffer;
1868 BCOPY(nak_buffer, inp, *lenp);
1875 LCPDEBUG(("lcp_reqci: returning CONF%s.", CODENAME(rc)));
1876 return (rc); /* Return final code */
1881 * lcp_up - LCP has come UP.
1887 lcp_options *wo = &lcp_wantoptions[f->unit];
1888 lcp_options *ho = &lcp_hisoptions[f->unit];
1889 lcp_options *go = &lcp_gotoptions[f->unit];
1890 lcp_options *ao = &lcp_allowoptions[f->unit];
1893 if (!go->neg_magicnumber)
1894 go->magicnumber = 0;
1895 if (!ho->neg_magicnumber)
1896 ho->magicnumber = 0;
1899 * Set our MTU to the smaller of the MTU we wanted and
1900 * the MRU our peer wanted. If we negotiated an MRU,
1901 * set our MRU to the larger of value we wanted and
1902 * the value we got in the negotiation.
1903 * Note on the MTU: the link MTU can be the MRU the peer wanted,
1904 * the interface MTU is set to the lowest of that, the
1905 * MTU we want to use, and our link MRU.
1907 mtu = ho->neg_mru? ho->mru: PPP_MRU;
1908 mru = go->neg_mru? MAX(wo->mru, go->mru): PPP_MRU;
1909 #ifdef HAVE_MULTILINK
1910 if (!(multilink && go->neg_mrru && ho->neg_mrru))
1911 #endif /* HAVE_MULTILINK */
1912 netif_set_mtu(f->unit, MIN(MIN(mtu, mru), ao->mru));
1913 ppp_send_config(f->unit, mtu,
1914 (ho->neg_asyncmap? ho->asyncmap: 0xffffffff),
1915 ho->neg_pcompression, ho->neg_accompression);
1916 ppp_recv_config(f->unit, mru,
1917 (lax_recv? 0: go->neg_asyncmap? go->asyncmap: 0xffffffff),
1918 go->neg_pcompression, go->neg_accompression);
1921 peer_mru[f->unit] = ho->mru;
1923 lcp_echo_lowerup(f->unit); /* Enable echo messages */
1925 link_established(f->unit);
1930 * lcp_down - LCP has gone DOWN.
1932 * Alert other protocols.
1938 lcp_options *go = &lcp_gotoptions[f->unit];
1940 lcp_echo_lowerdown(f->unit);
1944 ppp_send_config(f->unit, PPP_MRU, 0xffffffff, 0, 0);
1945 ppp_recv_config(f->unit, PPP_MRU,
1946 (go->neg_asyncmap? go->asyncmap: 0xffffffff),
1947 go->neg_pcompression, go->neg_accompression);
1948 peer_mru[f->unit] = PPP_MRU;
1953 * lcp_starting - LCP needs the lower layer up.
1959 link_required(f->unit);
1964 * lcp_finished - LCP has finished with the lower layer.
1970 link_terminated(f->unit);
1975 * lcp_printpkt - print the contents of an LCP packet.
1977 static char *lcp_codenames[] = {
1978 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1979 "TermReq", "TermAck", "CodeRej", "ProtRej",
1980 "EchoReq", "EchoRep", "DiscReq", "Ident",
1985 lcp_printpkt(p, plen, printer, arg)
1988 void (*printer) __P((void *, char *, ...));
1991 int code, id, len, olen, i;
1992 u_char *pstart, *optend;
1996 if (plen < HEADERLEN)
2002 if (len < HEADERLEN || len > plen)
2005 if (code >= 1 && code <= sizeof(lcp_codenames) / sizeof(char *))
2006 printer(arg, " %s", lcp_codenames[code-1]);
2008 printer(arg, " code=0x%x", code);
2009 printer(arg, " id=0x%x", id);
2016 /* print option list */
2021 if (olen < 2 || olen > len) {
2029 if (olen == CILEN_SHORT) {
2031 GETSHORT(cishort, p);
2032 printer(arg, "mru %d", cishort);
2036 if (olen == CILEN_LONG) {
2039 printer(arg, "asyncmap 0x%x", cilong);
2043 if (olen >= CILEN_SHORT) {
2045 printer(arg, "auth ");
2046 GETSHORT(cishort, p);
2049 printer(arg, "pap");
2052 printer(arg, "chap");
2056 printer(arg, " MD5");
2060 case CHAP_MICROSOFT:
2061 printer(arg, " MS");
2065 case CHAP_MICROSOFT_V2:
2066 printer(arg, " MS-v2");
2074 printer(arg, "eap");
2077 printer(arg, "0x%x", cishort);
2082 if (olen >= CILEN_SHORT) {
2084 printer(arg, "quality ");
2085 GETSHORT(cishort, p);
2088 printer(arg, "lqr");
2091 printer(arg, "0x%x", cishort);
2096 if (olen >= CILEN_CHAR) {
2098 printer(arg, "callback ");
2099 GETCHAR(cishort, p);
2102 printer(arg, "CBCP");
2105 printer(arg, "0x%x", cishort);
2109 case CI_MAGICNUMBER:
2110 if (olen == CILEN_LONG) {
2113 printer(arg, "magic 0x%x", cilong);
2116 case CI_PCOMPRESSION:
2117 if (olen == CILEN_VOID) {
2119 printer(arg, "pcomp");
2122 case CI_ACCOMPRESSION:
2123 if (olen == CILEN_VOID) {
2125 printer(arg, "accomp");
2129 if (olen == CILEN_SHORT) {
2131 GETSHORT(cishort, p);
2132 printer(arg, "mrru %d", cishort);
2136 if (olen == CILEN_VOID) {
2138 printer(arg, "ssnhf");
2142 #ifdef HAVE_MULTILINK
2143 if (olen >= CILEN_CHAR) {
2146 GETCHAR(epd.class, p);
2147 epd.length = olen - CILEN_CHAR;
2148 if (epd.length > MAX_ENDP_LEN)
2149 epd.length = MAX_ENDP_LEN;
2150 if (epd.length > 0) {
2151 BCOPY(p, epd.value, epd.length);
2154 printer(arg, "endpoint [%s]", epdisc_to_str(&epd));
2157 printer(arg, "endpoint");
2161 while (p < optend) {
2163 printer(arg, " %.2x", code);
2171 if (len > 0 && *p >= ' ' && *p < 0x7f) {
2173 print_string((char *)p, len, printer, arg);
2184 printer(arg, " magic=0x%x", cilong);
2193 printer(arg, " magic=0x%x", cilong);
2196 if (code == TIMEREM) {
2200 printer(arg, " seconds=%u", cilong);
2205 print_string((char *)p, len, printer, arg);
2212 /* print the rest of the bytes in the packet */
2213 for (i = 0; i < len && i < 32; ++i) {
2215 printer(arg, " %.2x", code);
2218 printer(arg, " ...");
2226 * Time to shut down the link because there is nothing out there.
2230 void LcpLinkFailure (f)
2233 if (f->state == OPENED) {
2234 info("No response to %d echo-requests", lcp_echos_pending);
2235 notice("Serial link appears to be disconnected.");
2236 status = EXIT_PEER_DEAD;
2237 lcp_close(f->unit, "Peer not responding");
2242 * Timer expired for the LCP echo requests from this process.
2249 LcpSendEchoRequest (f);
2250 if (f->state != OPENED)
2254 * Start the timer for the next interval.
2256 if (lcp_echo_timer_running)
2257 warn("assertion lcp_echo_timer_running==0 failed");
2258 TIMEOUT (LcpEchoTimeout, f, lcp_echo_interval);
2259 lcp_echo_timer_running = 1;
2263 * LcpEchoTimeout - Timer expired on the LCP echo
2267 LcpEchoTimeout (arg)
2270 if (lcp_echo_timer_running != 0) {
2271 lcp_echo_timer_running = 0;
2272 LcpEchoCheck ((fsm *) arg);
2277 * LcpEchoReply - LCP has received a reply to the echo
2281 lcp_received_echo_reply (f, id, inp, len)
2289 /* Check the magic number - don't count replies from ourselves. */
2291 dbglog("lcp: received short Echo-Reply, length %d", len);
2294 GETLONG(magic, inp);
2295 if (lcp_gotoptions[f->unit].neg_magicnumber
2296 && magic == lcp_gotoptions[f->unit].magicnumber) {
2297 warn("appear to have received our own echo-reply!");
2301 /* Reset the number of outstanding echo frames */
2302 lcp_echos_pending = 0;
2306 * LcpSendEchoRequest - Send an echo request frame to the peer
2310 LcpSendEchoRequest (f)
2313 u_int32_t lcp_magic;
2314 u_char pkt[4], *pktp;
2317 * Detect the failure of the peer at this point.
2319 if (lcp_echo_fails != 0) {
2320 if (lcp_echos_pending >= lcp_echo_fails) {
2322 lcp_echos_pending = 0;
2327 * Make and send the echo request frame.
2329 if (f->state == OPENED) {
2330 lcp_magic = lcp_gotoptions[f->unit].magicnumber;
2332 PUTLONG(lcp_magic, pktp);
2333 fsm_sdata(f, ECHOREQ, lcp_echo_number++ & 0xFF, pkt, pktp - pkt);
2334 ++lcp_echos_pending;
2339 * lcp_echo_lowerup - Start the timer for the LCP frame
2343 lcp_echo_lowerup (unit)
2346 fsm *f = &lcp_fsm[unit];
2348 /* Clear the parameters for generating echo frames */
2349 lcp_echos_pending = 0;
2350 lcp_echo_number = 0;
2351 lcp_echo_timer_running = 0;
2353 /* If a timeout interval is specified then start the timer */
2354 if (lcp_echo_interval != 0)
2359 * lcp_echo_lowerdown - Stop the timer for the LCP frame
2363 lcp_echo_lowerdown (unit)
2366 fsm *f = &lcp_fsm[unit];
2368 if (lcp_echo_timer_running != 0) {
2369 UNTIMEOUT (LcpEchoTimeout, f);
2370 lcp_echo_timer_running = 0;