1 /*****************************************************************************
2 * lcp.c - Network Link Control Protocol program file.
4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
5 * portions Copyright (c) 1997 by Global Election Systems Inc.
7 * The authors hereby grant permission to use, copy, modify, distribute,
8 * and license this software and its documentation for any purpose, provided
9 * that existing copyright notices are retained in all copies and that this
10 * notice and the following disclaimer are included verbatim in any
11 * distributions. No written agreement, license, or royalty fee is required
12 * for any of the authorized uses.
14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 ******************************************************************************
28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
30 * 97-12-01 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
32 *****************************************************************************/
35 * lcp.c - PPP Link Control Protocol.
37 * Copyright (c) 1989 Carnegie Mellon University.
38 * All rights reserved.
40 * Redistribution and use in source and binary forms are permitted
41 * provided that the above copyright notice and this paragraph are
42 * duplicated in all such forms and that any documentation,
43 * advertising materials, and other materials related to such
44 * distribution and use acknowledge that the software was developed
45 * by Carnegie Mellon University. The name of the
46 * University may not be used to endorse or promote products derived
47 * from this software without specific prior written permission.
48 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
49 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
50 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
56 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
70 #include "netif/ppp_oe.h"
72 #define PPPOE_MAXMTU PPP_MAXMRU
76 /*************************/
77 /*** LOCAL DEFINITIONS ***/
78 /*************************/
80 * Length of each type of configuration option (in octets)
84 #define CILEN_SHORT 4 /* CILEN_VOID + sizeof(short) */
85 #define CILEN_CHAP 5 /* CILEN_VOID + sizeof(short) + 1 */
86 #define CILEN_LONG 6 /* CILEN_VOID + sizeof(long) */
87 #define CILEN_LQR 8 /* CILEN_VOID + sizeof(short) + sizeof(long) */
91 /***********************************/
92 /*** LOCAL FUNCTION DECLARATIONS ***/
93 /***********************************/
95 * Callbacks for fsm code. (CI = Configuration Information)
97 static void lcp_resetci (fsm
*); /* Reset our CI */
98 static int lcp_cilen (fsm
*); /* Return length of our CI */
99 static void lcp_addci (fsm
*, u_char
*, int*); /* Add our CI to pkt */
100 static int lcp_ackci (fsm
*, u_char
*, int); /* Peer ack'd our CI */
101 static int lcp_nakci (fsm
*, u_char
*, int); /* Peer nak'd our CI */
102 static int lcp_rejci (fsm
*, u_char
*, int); /* Peer rej'd our CI */
103 static int lcp_reqci (fsm
*, u_char
*, int*, int); /* Rcv peer CI */
104 static void lcp_up (fsm
*); /* We're UP */
105 static void lcp_down (fsm
*); /* We're DOWN */
106 static void lcp_starting (fsm
*); /* We need lower layer up */
107 static void lcp_finished (fsm
*); /* We need lower layer down */
108 static int lcp_extcode (fsm
*, int, u_char
, u_char
*, int);
110 static void lcp_rprotrej (fsm
*, u_char
*, int);
113 * routines to send LCP echos to peer
115 static void lcp_echo_lowerup (int);
116 static void lcp_echo_lowerdown (int);
117 static void LcpEchoTimeout (void*);
118 static void lcp_received_echo_reply (fsm
*, int, u_char
*, int);
119 static void LcpSendEchoRequest (fsm
*);
120 static void LcpLinkFailure (fsm
*);
121 static void LcpEchoCheck (fsm
*);
124 * Protocol entry points.
125 * Some of these are called directly.
127 static void lcp_input (int, u_char
*, int);
128 static void lcp_protrej (int);
130 #define CODENAME(x) ((x) == CONFACK ? "ACK" : (x) == CONFNAK ? "NAK" : "REJ")
133 /******************************/
134 /*** PUBLIC DATA STRUCTURES ***/
135 /******************************/
137 LinkPhase lcp_phase
[NUM_PPP
]; /* Phase of link session (RFC 1661) */
138 lcp_options lcp_wantoptions
[NUM_PPP
]; /* Options that we want to request */
139 lcp_options lcp_gotoptions
[NUM_PPP
]; /* Options that peer ack'd */
140 lcp_options lcp_allowoptions
[NUM_PPP
]; /* Options we allow peer to request */
141 lcp_options lcp_hisoptions
[NUM_PPP
]; /* Options that we ack'd */
142 ext_accm xmit_accm
[NUM_PPP
]; /* extended transmit ACCM */
146 /*****************************/
147 /*** LOCAL DATA STRUCTURES ***/
148 /*****************************/
149 static fsm lcp_fsm
[NUM_PPP
]; /* LCP fsm structure (global)*/
150 static u_int lcp_echo_interval
= LCP_ECHOINTERVAL
; /* Interval between LCP echo-requests */
151 static u_int lcp_echo_fails
= LCP_MAXECHOFAILS
; /* Tolerance to unanswered echo-requests */
152 static u32_t lcp_echos_pending
= 0; /* Number of outstanding echo msgs */
153 static u32_t lcp_echo_number
= 0; /* ID number of next echo frame */
154 static u32_t lcp_echo_timer_running
= 0; /* TRUE if a timer is running */
156 static u_char nak_buffer
[PPP_MRU
]; /* where we construct a nak packet */
158 static fsm_callbacks lcp_callbacks
= { /* LCP callback routines */
159 lcp_resetci
, /* Reset our Configuration Information */
160 lcp_cilen
, /* Length of our Configuration Information */
161 lcp_addci
, /* Add our Configuration Information */
162 lcp_ackci
, /* ACK our Configuration Information */
163 lcp_nakci
, /* NAK our Configuration Information */
164 lcp_rejci
, /* Reject our Configuration Information */
165 lcp_reqci
, /* Request peer's Configuration Information */
166 lcp_up
, /* Called when fsm reaches LS_OPENED state */
167 lcp_down
, /* Called when fsm leaves LS_OPENED state */
168 lcp_starting
, /* Called when we want the lower layer up */
169 lcp_finished
, /* Called when we want the lower layer down */
170 NULL
, /* Called when Protocol-Reject received */
171 NULL
, /* Retransmission is necessary */
172 lcp_extcode
, /* Called to handle LCP-specific codes */
173 "LCP" /* String name of protocol */
176 struct protent lcp_protent
= {
198 int lcp_loopbackfail
= DEFLOOPBACKFAIL
;
202 /***********************************/
203 /*** PUBLIC FUNCTION DEFINITIONS ***/
204 /***********************************/
206 * lcp_init - Initialize LCP.
211 fsm
*f
= &lcp_fsm
[unit
];
212 lcp_options
*wo
= &lcp_wantoptions
[unit
];
213 lcp_options
*ao
= &lcp_allowoptions
[unit
];
216 f
->protocol
= PPP_LCP
;
217 f
->callbacks
= &lcp_callbacks
;
223 wo
->restart
= 0; /* Set to 1 in kernels or multi-line implementations */
225 wo
->mru
= PPP_DEFMRU
;
226 wo
->neg_asyncmap
= 1;
227 wo
->asyncmap
= 0x00000000l
; /* Assume don't need to escape any ctl chars. */
228 wo
->neg_chap
= 0; /* Set to 1 on server */
229 wo
->neg_upap
= 0; /* Set to 1 on server */
230 wo
->chap_mdtype
= CHAP_DIGEST_MD5
;
231 wo
->neg_magicnumber
= 1;
232 wo
->neg_pcompression
= 1;
233 wo
->neg_accompression
= 1;
234 wo
->neg_lqr
= 0; /* no LQR implementation yet */
238 ao
->mru
= PPP_MAXMRU
;
239 ao
->neg_asyncmap
= 1;
240 ao
->asyncmap
= 0x00000000l
; /* Assume don't need to escape any ctl chars. */
241 ao
->neg_chap
= (CHAP_SUPPORT
!= 0);
242 ao
->chap_mdtype
= CHAP_DIGEST_MD5
;
243 ao
->neg_upap
= (PAP_SUPPORT
!= 0);
244 ao
->neg_magicnumber
= 1;
245 ao
->neg_pcompression
= 1;
246 ao
->neg_accompression
= 1;
247 ao
->neg_lqr
= 0; /* no LQR implementation yet */
248 ao
->neg_cbcp
= (CBCP_SUPPORT
!= 0);
251 * Set transmit escape for the flag and escape characters plus anything
252 * set for the allowable options.
254 memset(xmit_accm
[unit
], 0, sizeof(xmit_accm
[0]));
255 xmit_accm
[unit
][15] = 0x60;
256 xmit_accm
[unit
][0] = (u_char
)((ao
->asyncmap
& 0xFF));
257 xmit_accm
[unit
][1] = (u_char
)((ao
->asyncmap
>> 8) & 0xFF);
258 xmit_accm
[unit
][2] = (u_char
)((ao
->asyncmap
>> 16) & 0xFF);
259 xmit_accm
[unit
][3] = (u_char
)((ao
->asyncmap
>> 24) & 0xFF);
260 LCPDEBUG((LOG_INFO
, "lcp_init: xmit_accm=%X %X %X %X\n",
264 xmit_accm
[unit
][3]));
266 lcp_phase
[unit
] = PHASE_INITIALIZE
;
271 * lcp_open - LCP is allowed to come up.
276 fsm
*f
= &lcp_fsm
[unit
];
277 lcp_options
*wo
= &lcp_wantoptions
[unit
];
281 f
->flags
|= OPT_PASSIVE
;
284 f
->flags
|= OPT_SILENT
;
288 lcp_phase
[unit
] = PHASE_ESTABLISH
;
293 * lcp_close - Take LCP down.
296 lcp_close(int unit
, char *reason
)
298 fsm
*f
= &lcp_fsm
[unit
];
300 if (lcp_phase
[unit
] != PHASE_DEAD
) {
301 lcp_phase
[unit
] = PHASE_TERMINATE
;
303 if (f
->state
== LS_STOPPED
&& f
->flags
& (OPT_PASSIVE
|OPT_SILENT
)) {
305 * This action is not strictly according to the FSM in RFC1548,
306 * but it does mean that the program terminates if you do an
307 * lcp_close() in passive/silent mode when a connection hasn't
310 f
->state
= LS_CLOSED
;
313 fsm_close(&lcp_fsm
[unit
], reason
);
319 * lcp_lowerup - The lower layer is up.
322 lcp_lowerup(int unit
)
324 lcp_options
*wo
= &lcp_wantoptions
[unit
];
327 * Don't use A/C or protocol compression on transmission,
328 * but accept A/C and protocol compressed packets
329 * if we are going to ask for A/C and protocol compression.
331 ppp_set_xaccm(unit
, &xmit_accm
[unit
]);
332 ppp_send_config(unit
, PPP_MRU
, 0xffffffffl
, 0, 0);
333 ppp_recv_config(unit
, PPP_MRU
, 0x00000000l
,
334 wo
->neg_pcompression
, wo
->neg_accompression
);
335 peer_mru
[unit
] = PPP_MRU
;
336 lcp_allowoptions
[unit
].asyncmap
= (u_long
)xmit_accm
[unit
][0]
337 | ((u_long
)xmit_accm
[unit
][1] << 8)
338 | ((u_long
)xmit_accm
[unit
][2] << 16)
339 | ((u_long
)xmit_accm
[unit
][3] << 24);
340 LCPDEBUG((LOG_INFO
, "lcp_lowerup: asyncmap=%X %X %X %X\n",
344 xmit_accm
[unit
][0]));
346 fsm_lowerup(&lcp_fsm
[unit
]);
351 * lcp_lowerdown - The lower layer is down.
354 lcp_lowerdown(int unit
)
356 fsm_lowerdown(&lcp_fsm
[unit
]);
360 * lcp_sprotrej - Send a Protocol-Reject for some protocol.
363 lcp_sprotrej(int unit
, u_char
*p
, int len
)
366 * Send back the protocol and the information field of the
367 * rejected packet. We only get here if LCP is in the LS_OPENED state.
370 fsm_sdata(&lcp_fsm
[unit
], PROTREJ
, ++lcp_fsm
[unit
].id
, p
, len
);
375 /**********************************/
376 /*** LOCAL FUNCTION DEFINITIONS ***/
377 /**********************************/
379 * lcp_input - Input LCP packet.
382 lcp_input(int unit
, u_char
*p
, int len
)
384 fsm
*f
= &lcp_fsm
[unit
];
386 fsm_input(f
, p
, len
);
391 * lcp_extcode - Handle a LCP-specific code.
394 lcp_extcode(fsm
*f
, int code
, u_char id
, u_char
*inp
, int len
)
400 lcp_rprotrej(f
, inp
, len
);
404 if (f
->state
!= LS_OPENED
) {
407 LCPDEBUG((LOG_INFO
, "lcp: Echo-Request, Rcvd id %d\n", id
));
409 PUTLONG(lcp_gotoptions
[f
->unit
].magicnumber
, magp
);
410 fsm_sdata(f
, ECHOREP
, id
, inp
, len
);
414 lcp_received_echo_reply(f
, id
, inp
, len
);
428 * lcp_rprotrej - Receive an Protocol-Reject.
430 * Figure out which protocol is rejected and inform it.
433 lcp_rprotrej(fsm
*f
, u_char
*inp
, int len
)
436 struct protent
*protp
;
439 if (len
< sizeof (u_short
)) {
440 LCPDEBUG((LOG_INFO
, "lcp_rprotrej: Rcvd short Protocol-Reject packet!\n"));
446 LCPDEBUG((LOG_INFO
, "lcp_rprotrej: Rcvd Protocol-Reject packet for %x!\n", prot
));
449 * Protocol-Reject packets received in any state other than the LCP
450 * LS_OPENED state SHOULD be silently discarded.
452 if( f
->state
!= LS_OPENED
) {
453 LCPDEBUG((LOG_INFO
, "Protocol-Reject discarded: LCP in state %d\n", f
->state
));
458 * Upcall the proper Protocol-Reject routine.
460 for (i
= 0; (protp
= ppp_protocols
[i
]) != NULL
; ++i
) {
461 if (protp
->protocol
== prot
&& protp
->enabled_flag
) {
462 (*protp
->protrej
)(f
->unit
);
467 LCPDEBUG((LOG_WARNING
, "Protocol-Reject for unsupported protocol 0x%x\n", prot
));
472 * lcp_protrej - A Protocol-Reject was received.
475 lcp_protrej(int unit
)
477 LWIP_UNUSED_ARG(unit
);
481 LCPDEBUG((LOG_WARNING
, "lcp_protrej: Received Protocol-Reject for LCP!\n"));
482 fsm_protreject(&lcp_fsm
[unit
]);
487 * lcp_resetci - Reset our CI.
492 lcp_wantoptions
[f
->unit
].magicnumber
= magic();
493 lcp_wantoptions
[f
->unit
].numloops
= 0;
494 lcp_gotoptions
[f
->unit
] = lcp_wantoptions
[f
->unit
];
495 peer_mru
[f
->unit
] = PPP_MRU
;
501 * lcp_cilen - Return length of our CI.
503 static int lcp_cilen(fsm
*f
)
505 lcp_options
*go
= &lcp_gotoptions
[f
->unit
];
507 #define LENCIVOID(neg) ((neg) ? CILEN_VOID : 0)
508 #define LENCICHAP(neg) ((neg) ? CILEN_CHAP : 0)
509 #define LENCISHORT(neg) ((neg) ? CILEN_SHORT : 0)
510 #define LENCILONG(neg) ((neg) ? CILEN_LONG : 0)
511 #define LENCILQR(neg) ((neg) ? CILEN_LQR: 0)
512 #define LENCICBCP(neg) ((neg) ? CILEN_CBCP: 0)
514 * NB: we only ask for one of CHAP and UPAP, even if we will
517 return (LENCISHORT(go
->neg_mru
&& go
->mru
!= PPP_DEFMRU
) +
518 LENCILONG(go
->neg_asyncmap
&& go
->asyncmap
!= 0xFFFFFFFFl
) +
519 LENCICHAP(go
->neg_chap
) +
520 LENCISHORT(!go
->neg_chap
&& go
->neg_upap
) +
521 LENCILQR(go
->neg_lqr
) +
522 LENCICBCP(go
->neg_cbcp
) +
523 LENCILONG(go
->neg_magicnumber
) +
524 LENCIVOID(go
->neg_pcompression
) +
525 LENCIVOID(go
->neg_accompression
));
530 * lcp_addci - Add our desired CIs to a packet.
533 lcp_addci(fsm
*f
, u_char
*ucp
, int *lenp
)
535 lcp_options
*go
= &lcp_gotoptions
[f
->unit
];
536 u_char
*start_ucp
= ucp
;
538 #define ADDCIVOID(opt, neg) \
540 LCPDEBUG((LOG_INFO, "lcp_addci: opt=%d\n", opt)); \
542 PUTCHAR(CILEN_VOID, ucp); \
544 #define ADDCISHORT(opt, neg, val) \
546 LCPDEBUG((LOG_INFO, "lcp_addci: INT opt=%d %X\n", opt, val)); \
548 PUTCHAR(CILEN_SHORT, ucp); \
549 PUTSHORT(val, ucp); \
551 #define ADDCICHAP(opt, neg, val, digest) \
553 LCPDEBUG((LOG_INFO, "lcp_addci: CHAP opt=%d %X\n", opt, val)); \
555 PUTCHAR(CILEN_CHAP, ucp); \
556 PUTSHORT(val, ucp); \
557 PUTCHAR(digest, ucp); \
559 #define ADDCILONG(opt, neg, val) \
561 LCPDEBUG((LOG_INFO, "lcp_addci: L opt=%d %lX\n", opt, val)); \
563 PUTCHAR(CILEN_LONG, ucp); \
566 #define ADDCILQR(opt, neg, val) \
568 LCPDEBUG((LOG_INFO, "lcp_addci: LQR opt=%d %lX\n", opt, val)); \
570 PUTCHAR(CILEN_LQR, ucp); \
571 PUTSHORT(PPP_LQR, ucp); \
574 #define ADDCICHAR(opt, neg, val) \
576 LCPDEBUG((LOG_INFO, "lcp_addci: CHAR opt=%d %X '%z'\n", opt, val, val)); \
578 PUTCHAR(CILEN_CHAR, ucp); \
582 ADDCISHORT(CI_MRU
, go
->neg_mru
&& go
->mru
!= PPP_DEFMRU
, go
->mru
);
583 ADDCILONG(CI_ASYNCMAP
, go
->neg_asyncmap
&& go
->asyncmap
!= 0xFFFFFFFFl
, go
->asyncmap
);
584 ADDCICHAP(CI_AUTHTYPE
, go
->neg_chap
, PPP_CHAP
, go
->chap_mdtype
);
585 ADDCISHORT(CI_AUTHTYPE
, !go
->neg_chap
&& go
->neg_upap
, PPP_PAP
);
586 ADDCILQR(CI_QUALITY
, go
->neg_lqr
, go
->lqr_period
);
587 ADDCICHAR(CI_CALLBACK
, go
->neg_cbcp
, CBCP_OPT
);
588 ADDCILONG(CI_MAGICNUMBER
, go
->neg_magicnumber
, go
->magicnumber
);
589 ADDCIVOID(CI_PCOMPRESSION
, go
->neg_pcompression
);
590 ADDCIVOID(CI_ACCOMPRESSION
, go
->neg_accompression
);
592 if (ucp
- start_ucp
!= *lenp
) {
593 /* this should never happen, because peer_mtu should be 1500 */
594 LCPDEBUG((LOG_ERR
, "Bug in lcp_addci: wrong length\n"));
600 * lcp_ackci - Ack our CIs.
601 * This should not modify any state if the Ack is bad.
608 lcp_ackci(fsm
*f
, u_char
*p
, int len
)
610 lcp_options
*go
= &lcp_gotoptions
[f
->unit
];
611 u_char cilen
, citype
, cichar
;
616 * CIs must be in exactly the same order that we sent.
617 * Check packet length and CI length at each step.
618 * If we find any deviations, then this packet is bad.
620 #define ACKCIVOID(opt, neg) \
622 if ((len -= CILEN_VOID) < 0) \
624 GETCHAR(citype, p); \
626 if (cilen != CILEN_VOID || citype != opt) \
629 #define ACKCISHORT(opt, neg, val) \
631 if ((len -= CILEN_SHORT) < 0) \
633 GETCHAR(citype, p); \
635 if (cilen != CILEN_SHORT || citype != opt) \
637 GETSHORT(cishort, p); \
638 if (cishort != val) \
641 #define ACKCICHAR(opt, neg, val) \
643 if ((len -= CILEN_CHAR) < 0) \
645 GETCHAR(citype, p); \
647 if (cilen != CILEN_CHAR || citype != opt) \
649 GETCHAR(cichar, p); \
653 #define ACKCICHAP(opt, neg, val, digest) \
655 if ((len -= CILEN_CHAP) < 0) \
657 GETCHAR(citype, p); \
659 if (cilen != CILEN_CHAP || citype != opt) \
661 GETSHORT(cishort, p); \
662 if (cishort != val) \
664 GETCHAR(cichar, p); \
665 if (cichar != digest) \
668 #define ACKCILONG(opt, neg, val) \
670 if ((len -= CILEN_LONG) < 0) \
672 GETCHAR(citype, p); \
674 if (cilen != CILEN_LONG || citype != opt) \
676 GETLONG(cilong, p); \
680 #define ACKCILQR(opt, neg, val) \
682 if ((len -= CILEN_LQR) < 0) \
684 GETCHAR(citype, p); \
686 if (cilen != CILEN_LQR || citype != opt) \
688 GETSHORT(cishort, p); \
689 if (cishort != PPP_LQR) \
691 GETLONG(cilong, p); \
696 ACKCISHORT(CI_MRU
, go
->neg_mru
&& go
->mru
!= PPP_DEFMRU
, go
->mru
);
697 ACKCILONG(CI_ASYNCMAP
, go
->neg_asyncmap
&& go
->asyncmap
!= 0xFFFFFFFFl
, go
->asyncmap
);
698 ACKCICHAP(CI_AUTHTYPE
, go
->neg_chap
, PPP_CHAP
, go
->chap_mdtype
);
699 ACKCISHORT(CI_AUTHTYPE
, !go
->neg_chap
&& go
->neg_upap
, PPP_PAP
);
700 ACKCILQR(CI_QUALITY
, go
->neg_lqr
, go
->lqr_period
);
701 ACKCICHAR(CI_CALLBACK
, go
->neg_cbcp
, CBCP_OPT
);
702 ACKCILONG(CI_MAGICNUMBER
, go
->neg_magicnumber
, go
->magicnumber
);
703 ACKCIVOID(CI_PCOMPRESSION
, go
->neg_pcompression
);
704 ACKCIVOID(CI_ACCOMPRESSION
, go
->neg_accompression
);
707 * If there are any remaining CIs, then this packet is bad.
712 LCPDEBUG((LOG_INFO
, "lcp_acki: Ack\n"));
715 LCPDEBUG((LOG_WARNING
, "lcp_acki: received bad Ack!\n"));
721 * lcp_nakci - Peer has sent a NAK for some of our CIs.
722 * This should not modify any state if the Nak is bad
723 * or if LCP is in the LS_OPENED state.
730 lcp_nakci(fsm
*f
, u_char
*p
, int len
)
732 lcp_options
*go
= &lcp_gotoptions
[f
->unit
];
733 lcp_options
*wo
= &lcp_wantoptions
[f
->unit
];
734 u_char citype
, cichar
, *next
;
737 lcp_options no
; /* options we've seen Naks for */
738 lcp_options
try; /* options to request next time */
742 BZERO(&no
, sizeof(no
));
746 * Any Nak'd CIs must be in exactly the same order that we sent.
747 * Check packet length and CI length at each step.
748 * If we find any deviations, then this packet is bad.
750 #define NAKCIVOID(opt, neg, code) \
752 len >= CILEN_VOID && \
753 p[1] == CILEN_VOID && \
756 INCPTR(CILEN_VOID, p); \
760 #define NAKCICHAP(opt, neg, code) \
762 len >= CILEN_CHAP && \
763 p[1] == CILEN_CHAP && \
767 GETSHORT(cishort, p); \
768 GETCHAR(cichar, p); \
772 #define NAKCICHAR(opt, neg, code) \
774 len >= CILEN_CHAR && \
775 p[1] == CILEN_CHAR && \
779 GETCHAR(cichar, p); \
783 #define NAKCISHORT(opt, neg, code) \
785 len >= CILEN_SHORT && \
786 p[1] == CILEN_SHORT && \
788 len -= CILEN_SHORT; \
790 GETSHORT(cishort, p); \
794 #define NAKCILONG(opt, neg, code) \
796 len >= CILEN_LONG && \
797 p[1] == CILEN_LONG && \
801 GETLONG(cilong, p); \
805 #define NAKCILQR(opt, neg, code) \
807 len >= CILEN_LQR && \
808 p[1] == CILEN_LQR && \
812 GETSHORT(cishort, p); \
813 GETLONG(cilong, p); \
819 * We don't care if they want to send us smaller packets than
820 * we want. Therefore, accept any MRU less than what we asked for,
821 * but then ignore the new value when setting the MRU in the kernel.
822 * If they send us a bigger MRU than what we asked, accept it, up to
823 * the limit of the default MRU we'd get if we didn't negotiate.
825 if (go
->neg_mru
&& go
->mru
!= PPP_DEFMRU
) {
826 NAKCISHORT(CI_MRU
, neg_mru
,
827 if (cishort
<= wo
->mru
|| cishort
< PPP_DEFMRU
) {
834 * Add any characters they want to our (receive-side) asyncmap.
836 if (go
->neg_asyncmap
&& go
->asyncmap
!= 0xFFFFFFFFl
) {
837 NAKCILONG(CI_ASYNCMAP
, neg_asyncmap
,
838 try.asyncmap
= go
->asyncmap
| cilong
;
843 * If they've nak'd our authentication-protocol, check whether
844 * they are proposing a different protocol, or a different
845 * hash algorithm for CHAP.
847 if ((go
->neg_chap
|| go
->neg_upap
)
848 && len
>= CILEN_SHORT
849 && p
[0] == CI_AUTHTYPE
&& p
[1] >= CILEN_SHORT
&& p
[1] <= len
) {
852 no
.neg_chap
= go
->neg_chap
;
853 no
.neg_upap
= go
->neg_upap
;
855 GETSHORT(cishort
, p
);
856 if (cishort
== PPP_PAP
&& cilen
== CILEN_SHORT
) {
858 * If we were asking for CHAP, they obviously don't want to do it.
859 * If we weren't asking for CHAP, then we were asking for PAP,
860 * in which case this Nak is bad.
867 } else if (cishort
== PPP_CHAP
&& cilen
== CILEN_CHAP
) {
871 * We were asking for CHAP/MD5; they must want a different
872 * algorithm. If they can't do MD5, we'll have to stop
875 if (cichar
!= go
->chap_mdtype
) {
880 * Stop asking for PAP if we were asking for it.
887 * We don't recognize what they're suggesting.
888 * Stop asking for what we were asking for.
895 p
+= cilen
- CILEN_SHORT
;
900 * If they can't cope with our link quality protocol, we'll have
901 * to stop asking for LQR. We haven't got any other protocol.
902 * If they Nak the reporting period, take their value XXX ?
904 NAKCILQR(CI_QUALITY
, neg_lqr
,
905 if (cishort
!= PPP_LQR
) {
908 try.lqr_period
= cilong
;
913 * Only implementing CBCP...not the rest of the callback options
915 NAKCICHAR(CI_CALLBACK
, neg_cbcp
,
920 * Check for a looped-back line.
922 NAKCILONG(CI_MAGICNUMBER
, neg_magicnumber
,
923 try.magicnumber
= magic();
928 * Peer shouldn't send Nak for protocol compression or
929 * address/control compression requests; they should send
930 * a Reject instead. If they send a Nak, treat it as a Reject.
932 NAKCIVOID(CI_PCOMPRESSION
, neg_pcompression
,
933 try.neg_pcompression
= 0;
935 NAKCIVOID(CI_ACCOMPRESSION
, neg_accompression
,
936 try.neg_accompression
= 0;
940 * There may be remaining CIs, if the peer is requesting negotiation
941 * on an option that we didn't include in our request packet.
942 * If we see an option that we requested, or one we've already seen
943 * in this packet, then this packet is bad.
944 * If we wanted to respond by starting to negotiate on the requested
945 * option(s), we could, but we don't, because except for the
946 * authentication type and quality protocol, if we are not negotiating
947 * an option, it is because we were told not to.
948 * For the authentication type, the Nak from the peer means
949 * `let me authenticate myself with you' which is a bit pointless.
950 * For the quality protocol, the Nak means `ask me to send you quality
951 * reports', but if we didn't ask for them, we don't want them.
952 * An option we don't recognize represents the peer asking to
953 * negotiate some option we don't support, so ignore it.
955 while (len
> CILEN_VOID
) {
958 if (cilen
< CILEN_VOID
|| (len
-= cilen
) < 0) {
961 next
= p
+ cilen
- 2;
965 if ((go
->neg_mru
&& go
->mru
!= PPP_DEFMRU
)
966 || no
.neg_mru
|| cilen
!= CILEN_SHORT
) {
969 GETSHORT(cishort
, p
);
970 if (cishort
< PPP_DEFMRU
) {
975 if ((go
->neg_asyncmap
&& go
->asyncmap
!= 0xFFFFFFFFl
)
976 || no
.neg_asyncmap
|| cilen
!= CILEN_LONG
) {
981 if (go
->neg_chap
|| no
.neg_chap
|| go
->neg_upap
|| no
.neg_upap
) {
986 if (go
->neg_magicnumber
|| no
.neg_magicnumber
||
987 cilen
!= CILEN_LONG
) {
991 case CI_PCOMPRESSION
:
992 if (go
->neg_pcompression
|| no
.neg_pcompression
993 || cilen
!= CILEN_VOID
) {
997 case CI_ACCOMPRESSION
:
998 if (go
->neg_accompression
|| no
.neg_accompression
999 || cilen
!= CILEN_VOID
) {
1004 if (go
->neg_lqr
|| no
.neg_lqr
|| cilen
!= CILEN_LQR
) {
1012 /* If there is still anything left, this packet is bad. */
1018 * OK, the Nak is good. Now we can update state.
1020 if (f
->state
!= LS_OPENED
) {
1022 if (++try.numloops
>= lcp_loopbackfail
) {
1023 LCPDEBUG((LOG_NOTICE
, "Serial line is looped back.\n"));
1024 lcp_close(f
->unit
, "Loopback detected");
1035 LCPDEBUG((LOG_WARNING
, "lcp_nakci: received bad Nak!\n"));
1041 * lcp_rejci - Peer has Rejected some of our CIs.
1042 * This should not modify any state if the Reject is bad
1043 * or if LCP is in the LS_OPENED state.
1046 * 0 - Reject was bad.
1047 * 1 - Reject was good.
1050 lcp_rejci(fsm
*f
, u_char
*p
, int len
)
1052 lcp_options
*go
= &lcp_gotoptions
[f
->unit
];
1056 lcp_options
try; /* options to request next time */
1061 * Any Rejected CIs must be in exactly the same order that we sent.
1062 * Check packet length and CI length at each step.
1063 * If we find any deviations, then this packet is bad.
1065 #define REJCIVOID(opt, neg) \
1067 len >= CILEN_VOID && \
1068 p[1] == CILEN_VOID && \
1070 len -= CILEN_VOID; \
1071 INCPTR(CILEN_VOID, p); \
1073 LCPDEBUG((LOG_INFO, "lcp_rejci: void opt %d rejected\n", opt)); \
1075 #define REJCISHORT(opt, neg, val) \
1077 len >= CILEN_SHORT && \
1078 p[1] == CILEN_SHORT && \
1080 len -= CILEN_SHORT; \
1082 GETSHORT(cishort, p); \
1083 /* Check rejected value. */ \
1084 if (cishort != val) { \
1088 LCPDEBUG((LOG_INFO,"lcp_rejci: short opt %d rejected\n", opt)); \
1090 #define REJCICHAP(opt, neg, val, digest) \
1092 len >= CILEN_CHAP && \
1093 p[1] == CILEN_CHAP && \
1095 len -= CILEN_CHAP; \
1097 GETSHORT(cishort, p); \
1098 GETCHAR(cichar, p); \
1099 /* Check rejected value. */ \
1100 if (cishort != val || cichar != digest) { \
1105 LCPDEBUG((LOG_INFO,"lcp_rejci: chap opt %d rejected\n", opt)); \
1107 #define REJCILONG(opt, neg, val) \
1109 len >= CILEN_LONG && \
1110 p[1] == CILEN_LONG && \
1112 len -= CILEN_LONG; \
1114 GETLONG(cilong, p); \
1115 /* Check rejected value. */ \
1116 if (cilong != val) { \
1120 LCPDEBUG((LOG_INFO,"lcp_rejci: long opt %d rejected\n", opt)); \
1122 #define REJCILQR(opt, neg, val) \
1124 len >= CILEN_LQR && \
1125 p[1] == CILEN_LQR && \
1129 GETSHORT(cishort, p); \
1130 GETLONG(cilong, p); \
1131 /* Check rejected value. */ \
1132 if (cishort != PPP_LQR || cilong != val) { \
1136 LCPDEBUG((LOG_INFO,"lcp_rejci: LQR opt %d rejected\n", opt)); \
1138 #define REJCICBCP(opt, neg, val) \
1140 len >= CILEN_CBCP && \
1141 p[1] == CILEN_CBCP && \
1143 len -= CILEN_CBCP; \
1145 GETCHAR(cichar, p); \
1146 /* Check rejected value. */ \
1147 if (cichar != val) { \
1151 LCPDEBUG((LOG_INFO,"lcp_rejci: Callback opt %d rejected\n", opt)); \
1154 REJCISHORT(CI_MRU
, neg_mru
, go
->mru
);
1155 REJCILONG(CI_ASYNCMAP
, neg_asyncmap
, go
->asyncmap
);
1156 REJCICHAP(CI_AUTHTYPE
, neg_chap
, PPP_CHAP
, go
->chap_mdtype
);
1157 if (!go
->neg_chap
) {
1158 REJCISHORT(CI_AUTHTYPE
, neg_upap
, PPP_PAP
);
1160 REJCILQR(CI_QUALITY
, neg_lqr
, go
->lqr_period
);
1161 REJCICBCP(CI_CALLBACK
, neg_cbcp
, CBCP_OPT
);
1162 REJCILONG(CI_MAGICNUMBER
, neg_magicnumber
, go
->magicnumber
);
1163 REJCIVOID(CI_PCOMPRESSION
, neg_pcompression
);
1164 REJCIVOID(CI_ACCOMPRESSION
, neg_accompression
);
1167 * If there are any remaining CIs, then this packet is bad.
1173 * Now we can update state.
1175 if (f
->state
!= LS_OPENED
) {
1181 LCPDEBUG((LOG_WARNING
, "lcp_rejci: received bad Reject!\n"));
1187 * lcp_reqci - Check the peer's requested CIs and send appropriate response.
1189 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
1190 * appropriately. If reject_if_disagree is non-zero, doesn't return
1191 * CONFNAK; returns CONFREJ if it can't return CONFACK.
1195 u_char
*inp
, /* Requested CIs */
1196 int *lenp
, /* Length of requested CIs */
1197 int reject_if_disagree
)
1199 lcp_options
*go
= &lcp_gotoptions
[f
->unit
];
1200 lcp_options
*ho
= &lcp_hisoptions
[f
->unit
];
1201 lcp_options
*ao
= &lcp_allowoptions
[f
->unit
];
1202 u_char
*cip
, *next
; /* Pointer to current and next CIs */
1203 int cilen
, citype
, cichar
; /* Parsed len, type, char value */
1204 u_short cishort
; /* Parsed short value */
1205 u32_t cilong
; /* Parse long value */
1206 int rc
= CONFACK
; /* Final packet return code */
1207 int orc
; /* Individual option return code */
1208 u_char
*p
; /* Pointer to next char to parse */
1209 u_char
*rejp
; /* Pointer to next char in reject frame */
1210 u_char
*nakp
; /* Pointer to next char in Nak frame */
1211 int l
= *lenp
; /* Length left */
1218 * Reset all his options.
1220 BZERO(ho
, sizeof(*ho
));
1223 * Process all his options.
1229 orc
= CONFACK
; /* Assume success */
1230 cip
= p
= next
; /* Remember begining of CI */
1231 if (l
< 2 || /* Not enough data for CI header or */
1232 p
[1] < 2 || /* CI length too small or */
1233 p
[1] > l
) { /* CI length too big? */
1234 LCPDEBUG((LOG_WARNING
, "lcp_reqci: bad CI length!\n"));
1235 orc
= CONFREJ
; /* Reject bad CI */
1236 cilen
= l
; /* Reject till end of packet */
1237 l
= 0; /* Don't loop again */
1241 GETCHAR(citype
, p
); /* Parse CI type */
1242 GETCHAR(cilen
, p
); /* Parse CI length */
1243 l
-= cilen
; /* Adjust remaining length */
1244 next
+= cilen
; /* Step to next CI */
1246 switch (citype
) { /* Check CI type */
1248 if (!ao
->neg_mru
) { /* Allow option? */
1249 LCPDEBUG((LOG_INFO
, "lcp_reqci: Reject MRU - not allowed\n"));
1250 orc
= CONFREJ
; /* Reject CI */
1252 } else if (cilen
!= CILEN_SHORT
) { /* Check CI length */
1253 LCPDEBUG((LOG_INFO
, "lcp_reqci: Reject MRU - bad length\n"));
1254 orc
= CONFREJ
; /* Reject CI */
1257 GETSHORT(cishort
, p
); /* Parse MRU */
1260 * He must be able to receive at least our minimum.
1261 * No need to check a maximum. If he sends a large number,
1262 * we'll just ignore it.
1264 if (cishort
< PPP_MINMRU
) {
1265 LCPDEBUG((LOG_INFO
, "lcp_reqci: Nak - MRU too small\n"));
1266 orc
= CONFNAK
; /* Nak CI */
1267 PUTCHAR(CI_MRU
, nakp
);
1268 PUTCHAR(CILEN_SHORT
, nakp
);
1269 PUTSHORT(PPP_MINMRU
, nakp
); /* Give him a hint */
1272 ho
->neg_mru
= 1; /* Remember he sent MRU */
1273 ho
->mru
= cishort
; /* And remember value */
1275 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " MRU %d", cishort
);
1276 traceNdx
= strlen(traceBuf
);
1281 if (!ao
->neg_asyncmap
) {
1282 LCPDEBUG((LOG_INFO
, "lcp_reqci: Reject ASYNCMAP not allowed\n"));
1285 } else if (cilen
!= CILEN_LONG
) {
1286 LCPDEBUG((LOG_INFO
, "lcp_reqci: Reject ASYNCMAP bad length\n"));
1293 * Asyncmap must have set at least the bits
1294 * which are set in lcp_allowoptions[unit].asyncmap.
1296 if ((ao
->asyncmap
& ~cilong
) != 0) {
1297 LCPDEBUG((LOG_INFO
, "lcp_reqci: Nak ASYNCMAP %lX missing %lX\n",
1298 cilong
, ao
->asyncmap
));
1300 PUTCHAR(CI_ASYNCMAP
, nakp
);
1301 PUTCHAR(CILEN_LONG
, nakp
);
1302 PUTLONG(ao
->asyncmap
| cilong
, nakp
);
1305 ho
->neg_asyncmap
= 1;
1306 ho
->asyncmap
= cilong
;
1308 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " ASYNCMAP=%lX", cilong
);
1309 traceNdx
= strlen(traceBuf
);
1314 if (cilen
< CILEN_SHORT
) {
1315 LCPDEBUG((LOG_INFO
, "lcp_reqci: Reject AUTHTYPE missing arg\n"));
1318 } else if (!(ao
->neg_upap
|| ao
->neg_chap
)) {
1320 * Reject the option if we're not willing to authenticate.
1322 LCPDEBUG((LOG_INFO
, "lcp_reqci: Reject AUTHTYPE not allowed\n"));
1326 GETSHORT(cishort
, p
);
1329 * Authtype must be UPAP or CHAP.
1331 * Note: if both ao->neg_upap and ao->neg_chap are set,
1332 * and the peer sends a Configure-Request with two
1333 * authenticate-protocol requests, one for CHAP and one
1334 * for UPAP, then we will reject the second request.
1335 * Whether we end up doing CHAP or UPAP depends then on
1336 * the ordering of the CIs in the peer's Configure-Request.
1339 if (cishort
== PPP_PAP
) {
1340 if (ho
->neg_chap
) { /* we've already accepted CHAP */
1341 LCPDEBUG((LOG_WARNING
, "lcp_reqci: Reject AUTHTYPE PAP already accepted\n"));
1344 } else if (cilen
!= CILEN_SHORT
) {
1345 LCPDEBUG((LOG_WARNING
, "lcp_reqci: Reject AUTHTYPE PAP bad len\n"));
1349 if (!ao
->neg_upap
) { /* we don't want to do PAP */
1350 LCPDEBUG((LOG_WARNING
, "lcp_reqci: Nak AUTHTYPE PAP not allowed\n"));
1351 orc
= CONFNAK
; /* NAK it and suggest CHAP */
1352 PUTCHAR(CI_AUTHTYPE
, nakp
);
1353 PUTCHAR(CILEN_CHAP
, nakp
);
1354 PUTSHORT(PPP_CHAP
, nakp
);
1355 PUTCHAR(ao
->chap_mdtype
, nakp
);
1360 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " PAP (%X)", cishort
);
1361 traceNdx
= strlen(traceBuf
);
1365 if (cishort
== PPP_CHAP
) {
1366 if (ho
->neg_upap
) { /* we've already accepted PAP */
1367 LCPDEBUG((LOG_WARNING
, "lcp_reqci: Reject AUTHTYPE CHAP accepted PAP\n"));
1370 } else if (cilen
!= CILEN_CHAP
) {
1371 LCPDEBUG((LOG_WARNING
, "lcp_reqci: Reject AUTHTYPE CHAP bad len\n"));
1375 if (!ao
->neg_chap
) { /* we don't want to do CHAP */
1376 LCPDEBUG((LOG_WARNING
, "lcp_reqci: Nak AUTHTYPE CHAP not allowed\n"));
1377 orc
= CONFNAK
; /* NAK it and suggest PAP */
1378 PUTCHAR(CI_AUTHTYPE
, nakp
);
1379 PUTCHAR(CILEN_SHORT
, nakp
);
1380 PUTSHORT(PPP_PAP
, nakp
);
1383 GETCHAR(cichar
, p
); /* get digest type*/
1384 if (cichar
!= CHAP_DIGEST_MD5
1386 && cichar
!= CHAP_MICROSOFT
1389 LCPDEBUG((LOG_WARNING
, "lcp_reqci: Nak AUTHTYPE CHAP digest=%d\n", cichar
));
1391 PUTCHAR(CI_AUTHTYPE
, nakp
);
1392 PUTCHAR(CILEN_CHAP
, nakp
);
1393 PUTSHORT(PPP_CHAP
, nakp
);
1394 PUTCHAR(ao
->chap_mdtype
, nakp
);
1398 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " CHAP %X,%d", cishort
, cichar
);
1399 traceNdx
= strlen(traceBuf
);
1401 ho
->chap_mdtype
= cichar
; /* save md type */
1407 * We don't recognize the protocol they're asking for.
1408 * Nak it with something we're willing to do.
1409 * (At this point we know ao->neg_upap || ao->neg_chap.)
1412 PUTCHAR(CI_AUTHTYPE
, nakp
);
1414 LCPDEBUG((LOG_WARNING
, "lcp_reqci: Nak AUTHTYPE %d req CHAP\n", cishort
));
1415 PUTCHAR(CILEN_CHAP
, nakp
);
1416 PUTSHORT(PPP_CHAP
, nakp
);
1417 PUTCHAR(ao
->chap_mdtype
, nakp
);
1419 LCPDEBUG((LOG_WARNING
, "lcp_reqci: Nak AUTHTYPE %d req PAP\n", cishort
));
1420 PUTCHAR(CILEN_SHORT
, nakp
);
1421 PUTSHORT(PPP_PAP
, nakp
);
1426 GETSHORT(cishort
, p
);
1429 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " QUALITY (%x %x)", cishort
, (unsigned int) cilong
);
1430 traceNdx
= strlen(traceBuf
);
1434 cilen
!= CILEN_LQR
) {
1440 * Check the protocol and the reporting period.
1441 * XXX When should we Nak this, and what with?
1443 if (cishort
!= PPP_LQR
) {
1445 PUTCHAR(CI_QUALITY
, nakp
);
1446 PUTCHAR(CILEN_LQR
, nakp
);
1447 PUTSHORT(PPP_LQR
, nakp
);
1448 PUTLONG(ao
->lqr_period
, nakp
);
1453 case CI_MAGICNUMBER
:
1454 if (!(ao
->neg_magicnumber
|| go
->neg_magicnumber
) ||
1455 cilen
!= CILEN_LONG
) {
1461 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " MAGICNUMBER (%lX)", cilong
);
1462 traceNdx
= strlen(traceBuf
);
1466 * He must have a different magic number.
1468 if (go
->neg_magicnumber
&&
1469 cilong
== go
->magicnumber
) {
1470 cilong
= magic(); /* Don't put magic() inside macro! */
1472 PUTCHAR(CI_MAGICNUMBER
, nakp
);
1473 PUTCHAR(CILEN_LONG
, nakp
);
1474 PUTLONG(cilong
, nakp
);
1477 ho
->neg_magicnumber
= 1;
1478 ho
->magicnumber
= cilong
;
1482 case CI_PCOMPRESSION
:
1484 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " PCOMPRESSION");
1485 traceNdx
= strlen(traceBuf
);
1487 if (!ao
->neg_pcompression
||
1488 cilen
!= CILEN_VOID
) {
1492 ho
->neg_pcompression
= 1;
1495 case CI_ACCOMPRESSION
:
1497 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " ACCOMPRESSION");
1498 traceNdx
= strlen(traceBuf
);
1500 if (!ao
->neg_accompression
||
1501 cilen
!= CILEN_VOID
) {
1505 ho
->neg_accompression
= 1;
1510 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " CI_MRRU");
1511 traceNdx
= strlen(traceBuf
);
1518 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " CI_SSNHF");
1519 traceNdx
= strlen(traceBuf
);
1526 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " CI_EPDISC");
1527 traceNdx
= strlen(traceBuf
);
1534 snprintf(&traceBuf
[traceNdx
], sizeof(traceBuf
), " unknown %d", citype
);
1535 traceNdx
= strlen(traceBuf
);
1543 if (traceNdx
>= 80 - 32) {
1544 LCPDEBUG((LOG_INFO
, "lcp_reqci: rcvd%s\n", traceBuf
));
1548 if (orc
== CONFACK
&& /* Good CI */
1549 rc
!= CONFACK
) { /* but prior CI wasnt? */
1550 continue; /* Don't send this one */
1553 if (orc
== CONFNAK
) { /* Nak this CI? */
1554 if (reject_if_disagree
/* Getting fed up with sending NAKs? */
1555 && citype
!= CI_MAGICNUMBER
) {
1556 orc
= CONFREJ
; /* Get tough if so */
1558 if (rc
== CONFREJ
) { /* Rejecting prior CI? */
1559 continue; /* Don't send this one */
1564 if (orc
== CONFREJ
) { /* Reject this CI */
1566 if (cip
!= rejp
) { /* Need to move rejected CI? */
1567 BCOPY(cip
, rejp
, cilen
); /* Move it */
1569 INCPTR(cilen
, rejp
); /* Update output pointer */
1574 * If we wanted to send additional NAKs (for unsent CIs), the
1575 * code would go here. The extra NAKs would go at *nakp.
1576 * At present there are no cases where we want to ask the
1577 * peer to negotiate an option.
1582 *lenp
= (int)(next
- inp
);
1586 * Copy the Nak'd options from the nak_buffer to the caller's buffer.
1588 *lenp
= (int)(nakp
- nak_buffer
);
1589 BCOPY(nak_buffer
, inp
, *lenp
);
1592 *lenp
= (int)(rejp
- inp
);
1598 LCPDEBUG((LOG_INFO
, "lcp_reqci: %s\n", traceBuf
));
1601 LCPDEBUG((LOG_INFO
, "lcp_reqci: returning CONF%s.\n", CODENAME(rc
)));
1602 return (rc
); /* Return final code */
1607 * lcp_up - LCP has come UP.
1612 lcp_options
*wo
= &lcp_wantoptions
[f
->unit
];
1613 lcp_options
*ho
= &lcp_hisoptions
[f
->unit
];
1614 lcp_options
*go
= &lcp_gotoptions
[f
->unit
];
1615 lcp_options
*ao
= &lcp_allowoptions
[f
->unit
];
1617 if (!go
->neg_magicnumber
) {
1618 go
->magicnumber
= 0;
1620 if (!ho
->neg_magicnumber
) {
1621 ho
->magicnumber
= 0;
1625 * Set our MTU to the smaller of the MTU we wanted and
1626 * the MRU our peer wanted. If we negotiated an MRU,
1627 * set our MRU to the larger of value we wanted and
1628 * the value we got in the negotiation.
1630 ppp_send_config(f
->unit
, LWIP_MIN(ao
->mru
, (ho
->neg_mru
? ho
->mru
: PPP_MRU
)),
1631 (ho
->neg_asyncmap
? ho
->asyncmap
: 0xffffffffl
),
1632 ho
->neg_pcompression
, ho
->neg_accompression
);
1634 * If the asyncmap hasn't been negotiated, we really should
1635 * set the receive asyncmap to ffffffff, but we set it to 0
1636 * for backwards contemptibility.
1638 ppp_recv_config(f
->unit
, (go
->neg_mru
? LWIP_MAX(wo
->mru
, go
->mru
): PPP_MRU
),
1639 (go
->neg_asyncmap
? go
->asyncmap
: 0x00000000),
1640 go
->neg_pcompression
, go
->neg_accompression
);
1643 peer_mru
[f
->unit
] = ho
->mru
;
1646 lcp_echo_lowerup(f
->unit
); /* Enable echo messages */
1648 link_established(f
->unit
);
1653 * lcp_down - LCP has gone DOWN.
1655 * Alert other protocols.
1660 lcp_options
*go
= &lcp_gotoptions
[f
->unit
];
1662 lcp_echo_lowerdown(f
->unit
);
1666 ppp_send_config(f
->unit
, PPP_MRU
, 0xffffffffl
, 0, 0);
1667 ppp_recv_config(f
->unit
, PPP_MRU
,
1668 (go
->neg_asyncmap
? go
->asyncmap
: 0x00000000),
1669 go
->neg_pcompression
, go
->neg_accompression
);
1670 peer_mru
[f
->unit
] = PPP_MRU
;
1675 * lcp_starting - LCP needs the lower layer up.
1678 lcp_starting(fsm
*f
)
1680 link_required(f
->unit
);
1685 * lcp_finished - LCP has finished with the lower layer.
1688 lcp_finished(fsm
*f
)
1690 link_terminated(f
->unit
);
1696 * print_string - print a readable representation of a string using
1700 print_string( char *p
, int len
, void (*printer
) (void *, char *, ...), void *arg
)
1705 for (; len
> 0; --len
) {
1707 if (' ' <= c
&& c
<= '~') {
1708 if (c
== '\\' || c
== '"') {
1711 printer(arg
, "%c", c
);
1715 printer(arg
, "\\n");
1718 printer(arg
, "\\r");
1721 printer(arg
, "\\t");
1724 printer(arg
, "\\%.3o", c
);
1733 * lcp_printpkt - print the contents of an LCP packet.
1735 static char *lcp_codenames
[] = {
1736 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1737 "TermReq", "TermAck", "CodeRej", "ProtRej",
1738 "EchoReq", "EchoRep", "DiscReq"
1742 lcp_printpkt( u_char
*p
, int plen
, void (*printer
) (void *, char *, ...), void *arg
)
1744 int code
, id
, len
, olen
;
1745 u_char
*pstart
, *optend
;
1749 if (plen
< HEADERLEN
) {
1756 if (len
< HEADERLEN
|| len
> plen
) {
1760 if (code
>= 1 && code
<= sizeof(lcp_codenames
) / sizeof(char *)) {
1761 printer(arg
, " %s", lcp_codenames
[code
-1]);
1763 printer(arg
, " code=0x%x", code
);
1765 printer(arg
, " id=0x%x", id
);
1772 /* print option list */
1777 if (olen
< 2 || olen
> len
) {
1785 if (olen
== CILEN_SHORT
) {
1787 GETSHORT(cishort
, p
);
1788 printer(arg
, "mru %d", cishort
);
1792 if (olen
== CILEN_LONG
) {
1795 printer(arg
, "asyncmap 0x%lx", cilong
);
1799 if (olen
>= CILEN_SHORT
) {
1801 printer(arg
, "auth ");
1802 GETSHORT(cishort
, p
);
1805 printer(arg
, "pap");
1808 printer(arg
, "chap");
1811 printer(arg
, "0x%x", cishort
);
1816 if (olen
>= CILEN_SHORT
) {
1818 printer(arg
, "quality ");
1819 GETSHORT(cishort
, p
);
1822 printer(arg
, "lqr");
1825 printer(arg
, "0x%x", cishort
);
1830 if (olen
>= CILEN_CHAR
) {
1832 printer(arg
, "callback ");
1833 GETSHORT(cishort
, p
);
1836 printer(arg
, "CBCP");
1839 printer(arg
, "0x%x", cishort
);
1843 case CI_MAGICNUMBER
:
1844 if (olen
== CILEN_LONG
) {
1847 printer(arg
, "magic 0x%x", cilong
);
1850 case CI_PCOMPRESSION
:
1851 if (olen
== CILEN_VOID
) {
1853 printer(arg
, "pcomp");
1856 case CI_ACCOMPRESSION
:
1857 if (olen
== CILEN_VOID
) {
1859 printer(arg
, "accomp");
1863 while (p
< optend
) {
1865 printer(arg
, " %.2x", code
);
1873 if (len
> 0 && *p
>= ' ' && *p
< 0x7f) {
1875 print_string((char*)p
, len
, printer
, arg
);
1886 printer(arg
, " magic=0x%x", cilong
);
1893 /* print the rest of the bytes in the packet */
1894 for (; len
> 0; --len
) {
1896 printer(arg
, " %.2x", code
);
1899 return (int)(p
- pstart
);
1904 * Time to shut down the link because there is nothing out there.
1907 LcpLinkFailure (fsm
*f
)
1909 if (f
->state
== LS_OPENED
) {
1910 LCPDEBUG((LOG_INFO
, "No response to %d echo-requests\n", lcp_echos_pending
));
1911 LCPDEBUG((LOG_NOTICE
, "Serial link appears to be disconnected.\n"));
1912 lcp_close(f
->unit
, "Peer not responding");
1917 * Timer expired for the LCP echo requests from this process.
1920 LcpEchoCheck (fsm
*f
)
1922 LcpSendEchoRequest (f
);
1925 * Start the timer for the next interval.
1927 LWIP_ASSERT("lcp_echo_timer_running == 0", lcp_echo_timer_running
== 0);
1929 TIMEOUT (LcpEchoTimeout
, f
, lcp_echo_interval
);
1930 lcp_echo_timer_running
= 1;
1934 * LcpEchoTimeout - Timer expired on the LCP echo
1937 LcpEchoTimeout (void *arg
)
1939 if (lcp_echo_timer_running
!= 0) {
1940 lcp_echo_timer_running
= 0;
1941 LcpEchoCheck ((fsm
*) arg
);
1946 * LcpEchoReply - LCP has received a reply to the echo
1949 lcp_received_echo_reply (fsm
*f
, int id
, u_char
*inp
, int len
)
1953 LWIP_UNUSED_ARG(id
);
1955 /* Check the magic number - don't count replies from ourselves. */
1957 LCPDEBUG((LOG_WARNING
, "lcp: received short Echo-Reply, length %d\n", len
));
1960 GETLONG(magic
, inp
);
1961 if (lcp_gotoptions
[f
->unit
].neg_magicnumber
&& magic
== lcp_gotoptions
[f
->unit
].magicnumber
) {
1962 LCPDEBUG((LOG_WARNING
, "appear to have received our own echo-reply!\n"));
1966 /* Reset the number of outstanding echo frames */
1967 lcp_echos_pending
= 0;
1971 * LcpSendEchoRequest - Send an echo request frame to the peer
1974 LcpSendEchoRequest (fsm
*f
)
1977 u_char pkt
[4], *pktp
;
1980 * Detect the failure of the peer at this point.
1982 if (lcp_echo_fails
!= 0) {
1983 if (lcp_echos_pending
++ >= lcp_echo_fails
) {
1985 lcp_echos_pending
= 0;
1990 * Make and send the echo request frame.
1992 if (f
->state
== LS_OPENED
) {
1993 lcp_magic
= lcp_gotoptions
[f
->unit
].magicnumber
;
1995 PUTLONG(lcp_magic
, pktp
);
1996 fsm_sdata(f
, ECHOREQ
, (u_char
)(lcp_echo_number
++ & 0xFF), pkt
, (int)(pktp
- pkt
));
2001 * lcp_echo_lowerup - Start the timer for the LCP frame
2005 lcp_echo_lowerup (int unit
)
2007 fsm
*f
= &lcp_fsm
[unit
];
2009 /* Clear the parameters for generating echo frames */
2010 lcp_echos_pending
= 0;
2011 lcp_echo_number
= 0;
2012 lcp_echo_timer_running
= 0;
2014 /* If a timeout interval is specified then start the timer */
2015 if (lcp_echo_interval
!= 0) {
2021 * lcp_echo_lowerdown - Stop the timer for the LCP frame
2025 lcp_echo_lowerdown (int unit
)
2027 fsm
*f
= &lcp_fsm
[unit
];
2029 if (lcp_echo_timer_running
!= 0) {
2030 UNTIMEOUT (LcpEchoTimeout
, f
);
2031 lcp_echo_timer_running
= 0;
2035 #endif /* PPP_SUPPORT */