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FreeRTOS
[armadillo_firmware.git] / FreeRTOS / Common / ethernet / lwIP / netif / ppp / ipcp.c
blobec3207a0c43fd9f39f135f4b95437e425eb375ec
1 /*****************************************************************************
2 * ipcp.c - Network PPP IP Control Protocol program file.
3 *
4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
5 * portions Copyright (c) 1997 by Global Election Systems Inc.
6 *
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.
13 *
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.
24 *
25 ******************************************************************************
26 * REVISION HISTORY
27 *
28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
29 * Ported to lwIP.
30 * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
31 * Original.
32 *****************************************************************************/
33 /*
34 * ipcp.c - PPP IP Control Protocol.
35 *
36 * Copyright (c) 1989 Carnegie Mellon University.
37 * All rights reserved.
38 *
39 * Redistribution and use in source and binary forms are permitted
40 * provided that the above copyright notice and this paragraph are
41 * duplicated in all such forms and that any documentation,
42 * advertising materials, and other materials related to such
43 * distribution and use acknowledge that the software was developed
44 * by Carnegie Mellon University. The name of the
45 * University may not be used to endorse or promote products derived
46 * from this software without specific prior written permission.
47 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
48 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
49 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
50 */
51
52 #include <string.h>
53
54 #include "ppp.h"
55 #if PPP_SUPPORT > 0
56 #include "auth.h"
57 #include "fsm.h"
58 #include "vj.h"
59 #include "ipcp.h"
60 #include "pppdebug.h"
61
62
63 /*************************/
64 /*** LOCAL DEFINITIONS ***/
65 /*************************/
66 /* #define OLD_CI_ADDRS 1 */ /* Support deprecated address negotiation. */
67
68 /*
69 * Lengths of configuration options.
70 */
71 #define CILEN_VOID 2
72 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
73 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
74 #define CILEN_ADDR 6 /* new-style single address option */
75 #define CILEN_ADDRS 10 /* old-style dual address option */
76
77
78
79 /***********************************/
80 /*** LOCAL FUNCTION DECLARATIONS ***/
81 /***********************************/
82 /*
83 * Callbacks for fsm code. (CI = Configuration Information)
84 */
85 static void ipcp_resetci (fsm *); /* Reset our CI */
86 static int ipcp_cilen (fsm *); /* Return length of our CI */
87 static void ipcp_addci (fsm *, u_char *, int *); /* Add our CI */
88 static int ipcp_ackci (fsm *, u_char *, int); /* Peer ack'd our CI */
89 static int ipcp_nakci (fsm *, u_char *, int); /* Peer nak'd our CI */
90 static int ipcp_rejci (fsm *, u_char *, int); /* Peer rej'd our CI */
91 static int ipcp_reqci (fsm *, u_char *, int *, int); /* Rcv CI */
92 static void ipcp_up (fsm *); /* We're UP */
93 static void ipcp_down (fsm *); /* We're DOWN */
94 #if 0
95 static void ipcp_script (fsm *, char *); /* Run an up/down script */
96 #endif
97 static void ipcp_finished (fsm *); /* Don't need lower layer */
98
99 /*
100 * Protocol entry points from main code.
101 */
102 static void ipcp_init (int);
103 static void ipcp_open (int);
104 static void ipcp_close (int, char *);
105 static void ipcp_lowerup (int);
106 static void ipcp_lowerdown (int);
107 static void ipcp_input (int, u_char *, int);
108 static void ipcp_protrej (int);
109
110 static void ipcp_clear_addrs (int);
111
112 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
113 (x) == CONFNAK ? "NAK" : "REJ")
114
115
116
117 /******************************/
118 /*** PUBLIC DATA STRUCTURES ***/
119 /******************************/
120 /* global vars */
121 ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */
122 ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
123 ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
124 ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
125
126 fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
127
128 struct protent ipcp_protent = {
129 PPP_IPCP,
130 ipcp_init,
131 ipcp_input,
132 ipcp_protrej,
133 ipcp_lowerup,
134 ipcp_lowerdown,
135 ipcp_open,
136 ipcp_close,
137 #if 0
138 ipcp_printpkt,
139 NULL,
140 #endif
141 1,
142 "IPCP",
143 #if 0
144 ip_check_options,
145 NULL,
146 ip_active_pkt
147 #endif
148 };
149
150
151
152 /*****************************/
153 /*** LOCAL DATA STRUCTURES ***/
154 /*****************************/
155 /* local vars */
156 static int cis_received[NUM_PPP]; /* # Conf-Reqs received */
157 static int default_route_set[NUM_PPP]; /* Have set up a default route */
158
159 static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
160 ipcp_resetci, /* Reset our Configuration Information */
161 ipcp_cilen, /* Length of our Configuration Information */
162 ipcp_addci, /* Add our Configuration Information */
163 ipcp_ackci, /* ACK our Configuration Information */
164 ipcp_nakci, /* NAK our Configuration Information */
165 ipcp_rejci, /* Reject our Configuration Information */
166 ipcp_reqci, /* Request peer's Configuration Information */
167 ipcp_up, /* Called when fsm reaches OPENED state */
168 ipcp_down, /* Called when fsm leaves OPENED state */
169 NULL, /* Called when we want the lower layer up */
170 ipcp_finished, /* Called when we want the lower layer down */
171 NULL, /* Called when Protocol-Reject received */
172 NULL, /* Retransmission is necessary */
173 NULL, /* Called to handle protocol-specific codes */
174 "IPCP" /* String name of protocol */
175 };
176
177
178
179 /**********************************/
180 /*** LOCAL FUNCTION DEFINITIONS ***/
181 /**********************************/
182
183 /*
184 * Non-standard inet_ntoa left here for compat with original ppp
185 * sources. Assumes u32_t instead of struct in_addr.
186 */
187
188 char * _inet_ntoa(u32_t n)
189 {
190 struct in_addr ia;
191 ia.s_addr = n;
192 return inet_ntoa(ia);
193 }
194
195 #define inet_ntoa _inet_ntoa
196
197 /*
198 * ipcp_init - Initialize IPCP.
199 */
200 static void ipcp_init(int unit)
201 {
202 fsm *f = &ipcp_fsm[unit];
203 ipcp_options *wo = &ipcp_wantoptions[unit];
204 ipcp_options *ao = &ipcp_allowoptions[unit];
205
206 f->unit = unit;
207 f->protocol = PPP_IPCP;
208 f->callbacks = &ipcp_callbacks;
209 fsm_init(&ipcp_fsm[unit]);
210
211 memset(wo, 0, sizeof(*wo));
212 memset(ao, 0, sizeof(*ao));
213
214 wo->neg_addr = 1;
215 wo->ouraddr = 0;
216 #if VJ_SUPPORT > 0
217 wo->neg_vj = 1;
218 #else
219 wo->neg_vj = 0;
220 #endif
221 wo->vj_protocol = IPCP_VJ_COMP;
222 wo->maxslotindex = MAX_SLOTS - 1;
223 wo->cflag = 0;
224
225 wo->default_route = 1;
226
227 ao->neg_addr = 1;
228 #if VJ_SUPPORT > 0
229 ao->neg_vj = 1;
230 #else
231 ao->neg_vj = 0;
232 #endif
233 ao->maxslotindex = MAX_SLOTS - 1;
234 ao->cflag = 1;
235
236 ao->default_route = 1;
237 }
238
239
240 /*
241 * ipcp_open - IPCP is allowed to come up.
242 */
243 static void ipcp_open(int unit)
244 {
245 fsm_open(&ipcp_fsm[unit]);
246 }
247
248
249 /*
250 * ipcp_close - Take IPCP down.
251 */
252 static void ipcp_close(int unit, char *reason)
253 {
254 fsm_close(&ipcp_fsm[unit], reason);
255 }
256
257
258 /*
259 * ipcp_lowerup - The lower layer is up.
260 */
261 static void ipcp_lowerup(int unit)
262 {
263 fsm_lowerup(&ipcp_fsm[unit]);
264 }
265
266
267 /*
268 * ipcp_lowerdown - The lower layer is down.
269 */
270 static void ipcp_lowerdown(int unit)
271 {
272 fsm_lowerdown(&ipcp_fsm[unit]);
273 }
274
275
276 /*
277 * ipcp_input - Input IPCP packet.
278 */
279 static void ipcp_input(int unit, u_char *p, int len)
280 {
281 fsm_input(&ipcp_fsm[unit], p, len);
282 }
283
284
285 /*
286 * ipcp_protrej - A Protocol-Reject was received for IPCP.
287 *
288 * Pretend the lower layer went down, so we shut up.
289 */
290 static void ipcp_protrej(int unit)
291 {
292 fsm_lowerdown(&ipcp_fsm[unit]);
293 }
294
295
296 /*
297 * ipcp_resetci - Reset our CI.
298 */
299 static void ipcp_resetci(fsm *f)
300 {
301 ipcp_options *wo = &ipcp_wantoptions[f->unit];
302
303 wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
304 if (wo->ouraddr == 0)
305 wo->accept_local = 1;
306 if (wo->hisaddr == 0)
307 wo->accept_remote = 1;
308 /* Request DNS addresses from the peer */
309 wo->req_dns1 = ppp_settings.usepeerdns;
310 wo->req_dns2 = ppp_settings.usepeerdns;
311 ipcp_gotoptions[f->unit] = *wo;
312 cis_received[f->unit] = 0;
313 }
314
315
316 /*
317 * ipcp_cilen - Return length of our CI.
318 */
319 static int ipcp_cilen(fsm *f)
320 {
321 ipcp_options *go = &ipcp_gotoptions[f->unit];
322 ipcp_options *wo = &ipcp_wantoptions[f->unit];
323 ipcp_options *ho = &ipcp_hisoptions[f->unit];
324
325 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
326 #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
327 #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0)
328
329 /*
330 * First see if we want to change our options to the old
331 * forms because we have received old forms from the peer.
332 */
333 if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
334 /* use the old style of address negotiation */
335 go->neg_addr = 1;
336 go->old_addrs = 1;
337 }
338 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
339 /* try an older style of VJ negotiation */
340 if (cis_received[f->unit] == 0) {
341 /* keep trying the new style until we see some CI from the peer */
342 go->neg_vj = 1;
343 } else {
344 /* use the old style only if the peer did */
345 if (ho->neg_vj && ho->old_vj) {
346 go->neg_vj = 1;
347 go->old_vj = 1;
348 go->vj_protocol = ho->vj_protocol;
349 }
350 }
351 }
352
353 return (LENCIADDR(go->neg_addr, go->old_addrs)
354 + LENCIVJ(go->neg_vj, go->old_vj) +
355 LENCIDNS(go->req_dns1) +
356 LENCIDNS(go->req_dns2));
357 }
358
359
360 /*
361 * ipcp_addci - Add our desired CIs to a packet.
362 */
363 static void ipcp_addci(fsm *f, u_char *ucp, int *lenp)
364 {
365 ipcp_options *go = &ipcp_gotoptions[f->unit];
366 int len = *lenp;
367
368 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
369 if (neg) { \
370 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
371 if (len >= vjlen) { \
372 PUTCHAR(opt, ucp); \
373 PUTCHAR(vjlen, ucp); \
374 PUTSHORT(val, ucp); \
375 if (!old) { \
376 PUTCHAR(maxslotindex, ucp); \
377 PUTCHAR(cflag, ucp); \
378 } \
379 len -= vjlen; \
380 } else \
381 neg = 0; \
382 }
383
384 #define ADDCIADDR(opt, neg, old, val1, val2) \
385 if (neg) { \
386 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
387 if (len >= addrlen) { \
388 u32_t l; \
389 PUTCHAR(opt, ucp); \
390 PUTCHAR(addrlen, ucp); \
391 l = ntohl(val1); \
392 PUTLONG(l, ucp); \
393 if (old) { \
394 l = ntohl(val2); \
395 PUTLONG(l, ucp); \
396 } \
397 len -= addrlen; \
398 } else \
399 neg = 0; \
400 }
401
402 #define ADDCIDNS(opt, neg, addr) \
403 if (neg) { \
404 if (len >= CILEN_ADDR) { \
405 u32_t l; \
406 PUTCHAR(opt, ucp); \
407 PUTCHAR(CILEN_ADDR, ucp); \
408 l = ntohl(addr); \
409 PUTLONG(l, ucp); \
410 len -= CILEN_ADDR; \
411 } else \
412 neg = 0; \
413 }
414
415 ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
416 go->old_addrs, go->ouraddr, go->hisaddr);
417
418 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
419 go->maxslotindex, go->cflag);
420
421 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
422
423 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
424
425 *lenp -= len;
426 }
427
428
429 /*
430 * ipcp_ackci - Ack our CIs.
431 *
432 * Returns:
433 * 0 - Ack was bad.
434 * 1 - Ack was good.
435 */
436 static int ipcp_ackci(fsm *f, u_char *p, int len)
437 {
438 ipcp_options *go = &ipcp_gotoptions[f->unit];
439 u_short cilen, citype, cishort;
440 u32_t cilong;
441 u_char cimaxslotindex, cicflag;
442
443 /*
444 * CIs must be in exactly the same order that we sent...
445 * Check packet length and CI length at each step.
446 * If we find any deviations, then this packet is bad.
447 */
448
449 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
450 if (neg) { \
451 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
452 if ((len -= vjlen) < 0) \
453 goto bad; \
454 GETCHAR(citype, p); \
455 GETCHAR(cilen, p); \
456 if (cilen != vjlen || \
457 citype != opt) \
458 goto bad; \
459 GETSHORT(cishort, p); \
460 if (cishort != val) \
461 goto bad; \
462 if (!old) { \
463 GETCHAR(cimaxslotindex, p); \
464 if (cimaxslotindex != maxslotindex) \
465 goto bad; \
466 GETCHAR(cicflag, p); \
467 if (cicflag != cflag) \
468 goto bad; \
469 } \
470 }
471
472 #define ACKCIADDR(opt, neg, old, val1, val2) \
473 if (neg) { \
474 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
475 u32_t l; \
476 if ((len -= addrlen) < 0) \
477 goto bad; \
478 GETCHAR(citype, p); \
479 GETCHAR(cilen, p); \
480 if (cilen != addrlen || \
481 citype != opt) \
482 goto bad; \
483 GETLONG(l, p); \
484 cilong = htonl(l); \
485 if (val1 != cilong) \
486 goto bad; \
487 if (old) { \
488 GETLONG(l, p); \
489 cilong = htonl(l); \
490 if (val2 != cilong) \
491 goto bad; \
492 } \
493 }
494
495 #define ACKCIDNS(opt, neg, addr) \
496 if (neg) { \
497 u32_t l; \
498 if ((len -= CILEN_ADDR) < 0) \
499 goto bad; \
500 GETCHAR(citype, p); \
501 GETCHAR(cilen, p); \
502 if (cilen != CILEN_ADDR || \
503 citype != opt) \
504 goto bad; \
505 GETLONG(l, p); \
506 cilong = htonl(l); \
507 if (addr != cilong) \
508 goto bad; \
509 }
510
511 ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
512 go->old_addrs, go->ouraddr, go->hisaddr);
513
514 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
515 go->maxslotindex, go->cflag);
516
517 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
518
519 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
520
521 /*
522 * If there are any remaining CIs, then this packet is bad.
523 */
524 if (len != 0)
525 goto bad;
526 return (1);
527
528 bad:
529 IPCPDEBUG((LOG_INFO, "ipcp_ackci: received bad Ack!\n"));
530 return (0);
531 }
532
533 /*
534 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
535 * This should not modify any state if the Nak is bad
536 * or if IPCP is in the OPENED state.
537 *
538 * Returns:
539 * 0 - Nak was bad.
540 * 1 - Nak was good.
541 */
542 static int ipcp_nakci(fsm *f, u_char *p, int len)
543 {
544 ipcp_options *go = &ipcp_gotoptions[f->unit];
545 u_char cimaxslotindex, cicflag;
546 u_char citype, cilen, *next;
547 u_short cishort;
548 u32_t ciaddr1, ciaddr2, l, cidnsaddr;
549 ipcp_options no; /* options we've seen Naks for */
550 ipcp_options try; /* options to request next time */
551
552 BZERO(&no, sizeof(no));
553 try = *go;
554
555 /*
556 * Any Nak'd CIs must be in exactly the same order that we sent.
557 * Check packet length and CI length at each step.
558 * If we find any deviations, then this packet is bad.
559 */
560 #define NAKCIADDR(opt, neg, old, code) \
561 if (go->neg && \
562 len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
563 p[1] == cilen && \
564 p[0] == opt) { \
565 len -= cilen; \
566 INCPTR(2, p); \
567 GETLONG(l, p); \
568 ciaddr1 = htonl(l); \
569 if (old) { \
570 GETLONG(l, p); \
571 ciaddr2 = htonl(l); \
572 no.old_addrs = 1; \
573 } else \
574 ciaddr2 = 0; \
575 no.neg = 1; \
576 code \
577 }
578
579 #define NAKCIVJ(opt, neg, code) \
580 if (go->neg && \
581 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
582 len >= cilen && \
583 p[0] == opt) { \
584 len -= cilen; \
585 INCPTR(2, p); \
586 GETSHORT(cishort, p); \
587 no.neg = 1; \
588 code \
589 }
590
591 #define NAKCIDNS(opt, neg, code) \
592 if (go->neg && \
593 ((cilen = p[1]) == CILEN_ADDR) && \
594 len >= cilen && \
595 p[0] == opt) { \
596 len -= cilen; \
597 INCPTR(2, p); \
598 GETLONG(l, p); \
599 cidnsaddr = htonl(l); \
600 no.neg = 1; \
601 code \
602 }
603
604 /*
605 * Accept the peer's idea of {our,his} address, if different
606 * from our idea, only if the accept_{local,remote} flag is set.
607 */
608 NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs,
609 if (go->accept_local && ciaddr1) { /* Do we know our address? */
610 try.ouraddr = ciaddr1;
611 IPCPDEBUG((LOG_INFO, "local IP address %s\n",
612 inet_ntoa(ciaddr1)));
613 }
614 if (go->accept_remote && ciaddr2) { /* Does he know his? */
615 try.hisaddr = ciaddr2;
616 IPCPDEBUG((LOG_INFO, "remote IP address %s\n",
617 inet_ntoa(ciaddr2)));
618 }
619 );
620
621 /*
622 * Accept the peer's value of maxslotindex provided that it
623 * is less than what we asked for. Turn off slot-ID compression
624 * if the peer wants. Send old-style compress-type option if
625 * the peer wants.
626 */
627 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
628 if (cilen == CILEN_VJ) {
629 GETCHAR(cimaxslotindex, p);
630 GETCHAR(cicflag, p);
631 if (cishort == IPCP_VJ_COMP) {
632 try.old_vj = 0;
633 if (cimaxslotindex < go->maxslotindex)
634 try.maxslotindex = cimaxslotindex;
635 if (!cicflag)
636 try.cflag = 0;
637 } else {
638 try.neg_vj = 0;
639 }
640 } else {
641 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
642 try.old_vj = 1;
643 try.vj_protocol = cishort;
644 } else {
645 try.neg_vj = 0;
646 }
647 }
648 );
649
650 NAKCIDNS(CI_MS_DNS1, req_dns1,
651 try.dnsaddr[0] = cidnsaddr;
652 IPCPDEBUG((LOG_INFO, "primary DNS address %s\n", inet_ntoa(cidnsaddr)));
653 );
654
655 NAKCIDNS(CI_MS_DNS2, req_dns2,
656 try.dnsaddr[1] = cidnsaddr;
657 IPCPDEBUG((LOG_INFO, "secondary DNS address %s\n", inet_ntoa(cidnsaddr)));
658 );
659
660 /*
661 * There may be remaining CIs, if the peer is requesting negotiation
662 * on an option that we didn't include in our request packet.
663 * If they want to negotiate about IP addresses, we comply.
664 * If they want us to ask for compression, we refuse.
665 */
666 while (len > CILEN_VOID) {
667 GETCHAR(citype, p);
668 GETCHAR(cilen, p);
669 if( (len -= cilen) < 0 )
670 goto bad;
671 next = p + cilen - 2;
672
673 switch (citype) {
674 case CI_COMPRESSTYPE:
675 if (go->neg_vj || no.neg_vj ||
676 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
677 goto bad;
678 no.neg_vj = 1;
679 break;
680 case CI_ADDRS:
681 if ((go->neg_addr && go->old_addrs) || no.old_addrs
682 || cilen != CILEN_ADDRS)
683 goto bad;
684 try.neg_addr = 1;
685 try.old_addrs = 1;
686 GETLONG(l, p);
687 ciaddr1 = htonl(l);
688 if (ciaddr1 && go->accept_local)
689 try.ouraddr = ciaddr1;
690 GETLONG(l, p);
691 ciaddr2 = htonl(l);
692 if (ciaddr2 && go->accept_remote)
693 try.hisaddr = ciaddr2;
694 no.old_addrs = 1;
695 break;
696 case CI_ADDR:
697 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
698 goto bad;
699 try.old_addrs = 0;
700 GETLONG(l, p);
701 ciaddr1 = htonl(l);
702 if (ciaddr1 && go->accept_local)
703 try.ouraddr = ciaddr1;
704 if (try.ouraddr != 0)
705 try.neg_addr = 1;
706 no.neg_addr = 1;
707 break;
708 }
709 p = next;
710 }
711
712 /* If there is still anything left, this packet is bad. */
713 if (len != 0)
714 goto bad;
715
716 /*
717 * OK, the Nak is good. Now we can update state.
718 */
719 if (f->state != OPENED)
720 *go = try;
721
722 return 1;
723
724 bad:
725 IPCPDEBUG((LOG_INFO, "ipcp_nakci: received bad Nak!\n"));
726 return 0;
727 }
728
729
730 /*
731 * ipcp_rejci - Reject some of our CIs.
732 */
733 static int ipcp_rejci(fsm *f, u_char *p, int len)
734 {
735 ipcp_options *go = &ipcp_gotoptions[f->unit];
736 u_char cimaxslotindex, ciflag, cilen;
737 u_short cishort;
738 u32_t cilong;
739 ipcp_options try; /* options to request next time */
740
741 try = *go;
742 /*
743 * Any Rejected CIs must be in exactly the same order that we sent.
744 * Check packet length and CI length at each step.
745 * If we find any deviations, then this packet is bad.
746 */
747 #define REJCIADDR(opt, neg, old, val1, val2) \
748 if (go->neg && \
749 len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
750 p[1] == cilen && \
751 p[0] == opt) { \
752 u32_t l; \
753 len -= cilen; \
754 INCPTR(2, p); \
755 GETLONG(l, p); \
756 cilong = htonl(l); \
757 /* Check rejected value. */ \
758 if (cilong != val1) \
759 goto bad; \
760 if (old) { \
761 GETLONG(l, p); \
762 cilong = htonl(l); \
763 /* Check rejected value. */ \
764 if (cilong != val2) \
765 goto bad; \
766 } \
767 try.neg = 0; \
768 }
769
770 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
771 if (go->neg && \
772 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
773 len >= p[1] && \
774 p[0] == opt) { \
775 len -= p[1]; \
776 INCPTR(2, p); \
777 GETSHORT(cishort, p); \
778 /* Check rejected value. */ \
779 if (cishort != val) \
780 goto bad; \
781 if (!old) { \
782 GETCHAR(cimaxslotindex, p); \
783 if (cimaxslotindex != maxslot) \
784 goto bad; \
785 GETCHAR(ciflag, p); \
786 if (ciflag != cflag) \
787 goto bad; \
788 } \
789 try.neg = 0; \
790 }
791
792 #define REJCIDNS(opt, neg, dnsaddr) \
793 if (go->neg && \
794 ((cilen = p[1]) == CILEN_ADDR) && \
795 len >= cilen && \
796 p[0] == opt) { \
797 u32_t l; \
798 len -= cilen; \
799 INCPTR(2, p); \
800 GETLONG(l, p); \
801 cilong = htonl(l); \
802 /* Check rejected value. */ \
803 if (cilong != dnsaddr) \
804 goto bad; \
805 try.neg = 0; \
806 }
807
808 REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
809 go->old_addrs, go->ouraddr, go->hisaddr);
810
811 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
812 go->maxslotindex, go->cflag);
813
814 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
815
816 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
817
818 /*
819 * If there are any remaining CIs, then this packet is bad.
820 */
821 if (len != 0)
822 goto bad;
823 /*
824 * Now we can update state.
825 */
826 if (f->state != OPENED)
827 *go = try;
828 return 1;
829
830 bad:
831 IPCPDEBUG((LOG_INFO, "ipcp_rejci: received bad Reject!\n"));
832 return 0;
833 }
834
835
836 /*
837 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
838 *
839 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
840 * appropriately. If reject_if_disagree is non-zero, doesn't return
841 * CONFNAK; returns CONFREJ if it can't return CONFACK.
842 */
843 static int ipcp_reqci(
844 fsm *f,
845 u_char *inp, /* Requested CIs */
846 int *len, /* Length of requested CIs */
847 int reject_if_disagree
848 )
849 {
850 ipcp_options *wo = &ipcp_wantoptions[f->unit];
851 ipcp_options *ho = &ipcp_hisoptions[f->unit];
852 ipcp_options *ao = &ipcp_allowoptions[f->unit];
853 #ifdef OLD_CI_ADDRS
854 ipcp_options *go = &ipcp_gotoptions[f->unit];
855 #endif
856 u_char *cip, *next; /* Pointer to current and next CIs */
857 u_short cilen, citype; /* Parsed len, type */
858 u_short cishort; /* Parsed short value */
859 u32_t tl, ciaddr1; /* Parsed address values */
860 #ifdef OLD_CI_ADDRS
861 u32_t ciaddr2; /* Parsed address values */
862 #endif
863 int rc = CONFACK; /* Final packet return code */
864 int orc; /* Individual option return code */
865 u_char *p; /* Pointer to next char to parse */
866 u_char *ucp = inp; /* Pointer to current output char */
867 int l = *len; /* Length left */
868 u_char maxslotindex, cflag;
869 int d;
870
871 cis_received[f->unit] = 1;
872
873 /*
874 * Reset all his options.
875 */
876 BZERO(ho, sizeof(*ho));
877
878 /*
879 * Process all his options.
880 */
881 next = inp;
882 while (l) {
883 orc = CONFACK; /* Assume success */
884 cip = p = next; /* Remember begining of CI */
885 if (l < 2 || /* Not enough data for CI header or */
886 p[1] < 2 || /* CI length too small or */
887 p[1] > l) { /* CI length too big? */
888 IPCPDEBUG((LOG_INFO, "ipcp_reqci: bad CI length!\n"));
889 orc = CONFREJ; /* Reject bad CI */
890 cilen = l; /* Reject till end of packet */
891 l = 0; /* Don't loop again */
892 goto endswitch;
893 }
894 GETCHAR(citype, p); /* Parse CI type */
895 GETCHAR(cilen, p); /* Parse CI length */
896 l -= cilen; /* Adjust remaining length */
897 next += cilen; /* Step to next CI */
898
899 switch (citype) { /* Check CI type */
900 #ifdef OLD_CI_ADDRS /* Need to save space... */
901 case CI_ADDRS:
902 IPCPDEBUG((LOG_INFO, "ipcp_reqci: received ADDRS\n"));
903 if (!ao->neg_addr ||
904 cilen != CILEN_ADDRS) { /* Check CI length */
905 orc = CONFREJ; /* Reject CI */
906 break;
907 }
908
909 /*
910 * If he has no address, or if we both have his address but
911 * disagree about it, then NAK it with our idea.
912 * In particular, if we don't know his address, but he does,
913 * then accept it.
914 */
915 GETLONG(tl, p); /* Parse source address (his) */
916 ciaddr1 = htonl(tl);
917 IPCPDEBUG((LOG_INFO, "his addr %s\n", inet_ntoa(ciaddr1)));
918 if (ciaddr1 != wo->hisaddr
919 && (ciaddr1 == 0 || !wo->accept_remote)) {
920 orc = CONFNAK;
921 if (!reject_if_disagree) {
922 DECPTR(sizeof(u32_t), p);
923 tl = ntohl(wo->hisaddr);
924 PUTLONG(tl, p);
925 }
926 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
927 /*
928 * If neither we nor he knows his address, reject the option.
929 */
930 orc = CONFREJ;
931 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
932 break;
933 }
934
935 /*
936 * If he doesn't know our address, or if we both have our address
937 * but disagree about it, then NAK it with our idea.
938 */
939 GETLONG(tl, p); /* Parse desination address (ours) */
940 ciaddr2 = htonl(tl);
941 IPCPDEBUG((LOG_INFO, "our addr %s\n", inet_ntoa(ciaddr2)));
942 if (ciaddr2 != wo->ouraddr) {
943 if (ciaddr2 == 0 || !wo->accept_local) {
944 orc = CONFNAK;
945 if (!reject_if_disagree) {
946 DECPTR(sizeof(u32_t), p);
947 tl = ntohl(wo->ouraddr);
948 PUTLONG(tl, p);
949 }
950 } else {
951 go->ouraddr = ciaddr2; /* accept peer's idea */
952 }
953 }
954
955 ho->neg_addr = 1;
956 ho->old_addrs = 1;
957 ho->hisaddr = ciaddr1;
958 ho->ouraddr = ciaddr2;
959 break;
960 #endif
961
962 case CI_ADDR:
963 if (!ao->neg_addr) {
964 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Reject ADDR not allowed\n"));
965 orc = CONFREJ; /* Reject CI */
966 break;
967 } else if (cilen != CILEN_ADDR) { /* Check CI length */
968 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Reject ADDR bad len\n"));
969 orc = CONFREJ; /* Reject CI */
970 break;
971 }
972
973 /*
974 * If he has no address, or if we both have his address but
975 * disagree about it, then NAK it with our idea.
976 * In particular, if we don't know his address, but he does,
977 * then accept it.
978 */
979 GETLONG(tl, p); /* Parse source address (his) */
980 ciaddr1 = htonl(tl);
981 if (ciaddr1 != wo->hisaddr
982 && (ciaddr1 == 0 || !wo->accept_remote)) {
983 orc = CONFNAK;
984 if (!reject_if_disagree) {
985 DECPTR(sizeof(u32_t), p);
986 tl = ntohl(wo->hisaddr);
987 PUTLONG(tl, p);
988 }
989 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Nak ADDR %s\n", inet_ntoa(ciaddr1)));
990 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
991 /*
992 * Don't ACK an address of 0.0.0.0 - reject it instead.
993 */
994 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Reject ADDR %s\n", inet_ntoa(ciaddr1)));
995 orc = CONFREJ;
996 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
997 break;
998 }
999
1000 ho->neg_addr = 1;
1001 ho->hisaddr = ciaddr1;
1002 IPCPDEBUG((LOG_INFO, "ipcp_reqci: ADDR %s\n", inet_ntoa(ciaddr1)));
1003 break;
1004
1005 case CI_MS_DNS1:
1006 case CI_MS_DNS2:
1007 /* Microsoft primary or secondary DNS request */
1008 d = citype == CI_MS_DNS2;
1009
1010 /* If we do not have a DNS address then we cannot send it */
1011 if (ao->dnsaddr[d] == 0 ||
1012 cilen != CILEN_ADDR) { /* Check CI length */
1013 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting DNS%d Request\n", d+1));
1014 orc = CONFREJ; /* Reject CI */
1015 break;
1016 }
1017 GETLONG(tl, p);
1018 if (htonl(tl) != ao->dnsaddr[d]) {
1019 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Naking DNS%d Request %d\n",
1020 d+1, inet_ntoa(tl)));
1021 DECPTR(sizeof(u32_t), p);
1022 tl = ntohl(ao->dnsaddr[d]);
1023 PUTLONG(tl, p);
1024 orc = CONFNAK;
1025 }
1026 IPCPDEBUG((LOG_INFO, "ipcp_reqci: received DNS%d Request\n", d+1));
1027 break;
1028
1029 case CI_MS_WINS1:
1030 case CI_MS_WINS2:
1031 /* Microsoft primary or secondary WINS request */
1032 d = citype == CI_MS_WINS2;
1033 IPCPDEBUG((LOG_INFO, "ipcp_reqci: received WINS%d Request\n", d+1));
1034
1035 /* If we do not have a DNS address then we cannot send it */
1036 if (ao->winsaddr[d] == 0 ||
1037 cilen != CILEN_ADDR) { /* Check CI length */
1038 orc = CONFREJ; /* Reject CI */
1039 break;
1040 }
1041 GETLONG(tl, p);
1042 if (htonl(tl) != ao->winsaddr[d]) {
1043 DECPTR(sizeof(u32_t), p);
1044 tl = ntohl(ao->winsaddr[d]);
1045 PUTLONG(tl, p);
1046 orc = CONFNAK;
1047 }
1048 break;
1049
1050 case CI_COMPRESSTYPE:
1051 if (!ao->neg_vj) {
1052 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting COMPRESSTYPE not allowed\n"));
1053 orc = CONFREJ;
1054 break;
1055 } else if (cilen != CILEN_VJ && cilen != CILEN_COMPRESS) {
1056 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting COMPRESSTYPE len=%d\n", cilen));
1057 orc = CONFREJ;
1058 break;
1059 }
1060 GETSHORT(cishort, p);
1061
1062 if (!(cishort == IPCP_VJ_COMP ||
1063 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1064 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting COMPRESSTYPE %d\n", cishort));
1065 orc = CONFREJ;
1066 break;
1067 }
1068
1069 ho->neg_vj = 1;
1070 ho->vj_protocol = cishort;
1071 if (cilen == CILEN_VJ) {
1072 GETCHAR(maxslotindex, p);
1073 if (maxslotindex > ao->maxslotindex) {
1074 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Naking VJ max slot %d\n", maxslotindex));
1075 orc = CONFNAK;
1076 if (!reject_if_disagree){
1077 DECPTR(1, p);
1078 PUTCHAR(ao->maxslotindex, p);
1079 }
1080 }
1081 GETCHAR(cflag, p);
1082 if (cflag && !ao->cflag) {
1083 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Naking VJ cflag %d\n", cflag));
1084 orc = CONFNAK;
1085 if (!reject_if_disagree){
1086 DECPTR(1, p);
1087 PUTCHAR(wo->cflag, p);
1088 }
1089 }
1090 ho->maxslotindex = maxslotindex;
1091 ho->cflag = cflag;
1092 } else {
1093 ho->old_vj = 1;
1094 ho->maxslotindex = MAX_SLOTS - 1;
1095 ho->cflag = 1;
1096 }
1097 IPCPDEBUG((LOG_INFO,
1098 "ipcp_reqci: received COMPRESSTYPE p=%d old=%d maxslot=%d cflag=%d\n",
1099 ho->vj_protocol, ho->old_vj, ho->maxslotindex, ho->cflag));
1100 break;
1101
1102 default:
1103 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting unknown CI type %d\n", citype));
1104 orc = CONFREJ;
1105 break;
1106 }
1107
1108 endswitch:
1109 if (orc == CONFACK && /* Good CI */
1110 rc != CONFACK) /* but prior CI wasnt? */
1111 continue; /* Don't send this one */
1112
1113 if (orc == CONFNAK) { /* Nak this CI? */
1114 if (reject_if_disagree) { /* Getting fed up with sending NAKs? */
1115 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting too many naks\n"));
1116 orc = CONFREJ; /* Get tough if so */
1117 } else {
1118 if (rc == CONFREJ) /* Rejecting prior CI? */
1119 continue; /* Don't send this one */
1120 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1121 rc = CONFNAK; /* Not anymore... */
1122 ucp = inp; /* Backup */
1123 }
1124 }
1125 }
1126
1127 if (orc == CONFREJ && /* Reject this CI */
1128 rc != CONFREJ) { /* but no prior ones? */
1129 rc = CONFREJ;
1130 ucp = inp; /* Backup */
1131 }
1132
1133 /* Need to move CI? */
1134 if (ucp != cip)
1135 BCOPY(cip, ucp, cilen); /* Move it */
1136
1137 /* Update output pointer */
1138 INCPTR(cilen, ucp);
1139 }
1140
1141 /*
1142 * If we aren't rejecting this packet, and we want to negotiate
1143 * their address, and they didn't send their address, then we
1144 * send a NAK with a CI_ADDR option appended. We assume the
1145 * input buffer is long enough that we can append the extra
1146 * option safely.
1147 */
1148 if (rc != CONFREJ && !ho->neg_addr &&
1149 wo->req_addr && !reject_if_disagree) {
1150 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Requesting peer address\n"));
1151 if (rc == CONFACK) {
1152 rc = CONFNAK;
1153 ucp = inp; /* reset pointer */
1154 wo->req_addr = 0; /* don't ask again */
1155 }
1156 PUTCHAR(CI_ADDR, ucp);
1157 PUTCHAR(CILEN_ADDR, ucp);
1158 tl = ntohl(wo->hisaddr);
1159 PUTLONG(tl, ucp);
1160 }
1161
1162 *len = (int)(ucp - inp); /* Compute output length */
1163 IPCPDEBUG((LOG_INFO, "ipcp_reqci: returning Configure-%s\n", CODENAME(rc)));
1164 return (rc); /* Return final code */
1165 }
1166
1167
1168 #if 0
1169 /*
1170 * ip_check_options - check that any IP-related options are OK,
1171 * and assign appropriate defaults.
1172 */
1173 static void ip_check_options(u_long localAddr)
1174 {
1175 ipcp_options *wo = &ipcp_wantoptions[0];
1176
1177 /*
1178 * Load our default IP address but allow the remote host to give us
1179 * a new address.
1180 */
1181 if (wo->ouraddr == 0 && !ppp_settings.disable_defaultip) {
1182 wo->accept_local = 1; /* don't insist on this default value */
1183 wo->ouraddr = htonl(localAddr);
1184 }
1185 }
1186 #endif
1187
1188
1189 /*
1190 * ipcp_up - IPCP has come UP.
1191 *
1192 * Configure the IP network interface appropriately and bring it up.
1193 */
1194 static void ipcp_up(fsm *f)
1195 {
1196 u32_t mask;
1197 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1198 ipcp_options *go = &ipcp_gotoptions[f->unit];
1199 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1200
1201 np_up(f->unit, PPP_IP);
1202 IPCPDEBUG((LOG_INFO, "ipcp: up\n"));
1203
1204 /*
1205 * We must have a non-zero IP address for both ends of the link.
1206 */
1207 if (!ho->neg_addr)
1208 ho->hisaddr = wo->hisaddr;
1209
1210 if (ho->hisaddr == 0) {
1211 IPCPDEBUG((LOG_ERR, "Could not determine remote IP address\n"));
1212 ipcp_close(f->unit, "Could not determine remote IP address");
1213 return;
1214 }
1215 if (go->ouraddr == 0) {
1216 IPCPDEBUG((LOG_ERR, "Could not determine local IP address\n"));
1217 ipcp_close(f->unit, "Could not determine local IP address");
1218 return;
1219 }
1220
1221 if (ppp_settings.usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1222 /*pppGotDNSAddrs(go->dnsaddr[0], go->dnsaddr[1]);*/
1223 }
1224
1225 /*
1226 * Check that the peer is allowed to use the IP address it wants.
1227 */
1228 if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1229 IPCPDEBUG((LOG_ERR, "Peer is not authorized to use remote address %s\n",
1230 inet_ntoa(ho->hisaddr)));
1231 ipcp_close(f->unit, "Unauthorized remote IP address");
1232 return;
1233 }
1234
1235 /* set tcp compression */
1236 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1237
1238 /*
1239 * Set IP addresses and (if specified) netmask.
1240 */
1241 mask = GetMask(go->ouraddr);
1242
1243 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask, go->dnsaddr[0], go->dnsaddr[1])) {
1244 IPCPDEBUG((LOG_WARNING, "sifaddr failed\n"));
1245 ipcp_close(f->unit, "Interface configuration failed");
1246 return;
1247 }
1248
1249 /* bring the interface up for IP */
1250 if (!sifup(f->unit)) {
1251 IPCPDEBUG((LOG_WARNING, "sifup failed\n"));
1252 ipcp_close(f->unit, "Interface configuration failed");
1253 return;
1254 }
1255
1256 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1257
1258 /* assign a default route through the interface if required */
1259 if (ipcp_wantoptions[f->unit].default_route)
1260 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1261 default_route_set[f->unit] = 1;
1262
1263 IPCPDEBUG((LOG_NOTICE, "local IP address %s\n", inet_ntoa(go->ouraddr)));
1264 IPCPDEBUG((LOG_NOTICE, "remote IP address %s\n", inet_ntoa(ho->hisaddr)));
1265 if (go->dnsaddr[0]) {
1266 IPCPDEBUG((LOG_NOTICE, "primary DNS address %s\n", inet_ntoa(go->dnsaddr[0])));
1267 }
1268 if (go->dnsaddr[1]) {
1269 IPCPDEBUG((LOG_NOTICE, "secondary DNS address %s\n", inet_ntoa(go->dnsaddr[1])));
1270 }
1271 }
1272
1273
1274 /*
1275 * ipcp_down - IPCP has gone DOWN.
1276 *
1277 * Take the IP network interface down, clear its addresses
1278 * and delete routes through it.
1279 */
1280 static void ipcp_down(fsm *f)
1281 {
1282 IPCPDEBUG((LOG_INFO, "ipcp: down\n"));
1283 np_down(f->unit, PPP_IP);
1284 sifvjcomp(f->unit, 0, 0, 0);
1285
1286 sifdown(f->unit);
1287 ipcp_clear_addrs(f->unit);
1288 }
1289
1290
1291 /*
1292 * ipcp_clear_addrs() - clear the interface addresses, routes, etc.
1293 */
1294 static void ipcp_clear_addrs(int unit)
1295 {
1296 u32_t ouraddr, hisaddr;
1297
1298 ouraddr = ipcp_gotoptions[unit].ouraddr;
1299 hisaddr = ipcp_hisoptions[unit].hisaddr;
1300 if (default_route_set[unit]) {
1301 cifdefaultroute(unit, ouraddr, hisaddr);
1302 default_route_set[unit] = 0;
1303 }
1304 cifaddr(unit, ouraddr, hisaddr);
1305 }
1306
1307
1308 /*
1309 * ipcp_finished - possibly shut down the lower layers.
1310 */
1311 static void ipcp_finished(fsm *f)
1312 {
1313 np_finished(f->unit, PPP_IP);
1314 }
1315
1316 #if 0
1317 static int ipcp_printpkt(
1318 u_char *p,
1319 int plen,
1320 void (*printer) (void *, char *, ...),
1321 void *arg
1322 )
1323 {
1324 (void)p;
1325 (void)plen;
1326 (void)printer;
1327 (void)arg;
1328 return 0;
1329 }
1330
1331 /*
1332 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
1333 * We don't bring the link up for IP fragments or for TCP FIN packets
1334 * with no data.
1335 */
1336 #define IP_HDRLEN 20 /* bytes */
1337 #define IP_OFFMASK 0x1fff
1338 #define IPPROTO_TCP 6
1339 #define TCP_HDRLEN 20
1340 #define TH_FIN 0x01
1341
1342 /*
1343 * We use these macros because the IP header may be at an odd address,
1344 * and some compilers might use word loads to get th_off or ip_hl.
1345 */
1346
1347 #define net_short(x) (((x)[0] << 8) + (x)[1])
1348 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
1349 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
1350 #define get_ipproto(x) (((unsigned char *)(x))[9])
1351 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1352 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1353
1354 static int ip_active_pkt(u_char *pkt, int len)
1355 {
1356 u_char *tcp;
1357 int hlen;
1358
1359 len -= PPP_HDRLEN;
1360 pkt += PPP_HDRLEN;
1361 if (len < IP_HDRLEN)
1362 return 0;
1363 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
1364 return 0;
1365 if (get_ipproto(pkt) != IPPROTO_TCP)
1366 return 1;
1367 hlen = get_iphl(pkt) * 4;
1368 if (len < hlen + TCP_HDRLEN)
1369 return 0;
1370 tcp = pkt + hlen;
1371 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)
1372 return 0;
1373 return 1;
1374 }
1375 #endif
1376
1377 #endif /* PPP_SUPPORT */
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