source: UsbWattMeter/trunk/lwip-1.4.1/src/netif/ppp/ipcp.c@ 164

Last change on this file since 164 was 164, checked in by coas-nagasima, 6 years ago

TOPPERS/ECNLサンプルアプリ「USB充電器電力計」を追加

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1/** In contrast to pppd 2.3.1, DNS support has been added, proxy-ARP and
2 dial-on-demand has been stripped. */
3/*****************************************************************************
4* ipcp.c - Network PPP IP Control Protocol program file.
5*
6* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
7* portions Copyright (c) 1997 by Global Election Systems Inc.
8*
9* The authors hereby grant permission to use, copy, modify, distribute,
10* and license this software and its documentation for any purpose, provided
11* that existing copyright notices are retained in all copies and that this
12* notice and the following disclaimer are included verbatim in any
13* distributions. No written agreement, license, or royalty fee is required
14* for any of the authorized uses.
15*
16* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
17* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26*
27******************************************************************************
28* REVISION HISTORY
29*
30* 03-01-01 Marc Boucher <marc@mbsi.ca>
31* Ported to lwIP.
32* 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
33* Original.
34*****************************************************************************/
35/*
36 * ipcp.c - PPP IP Control Protocol.
37 *
38 * Copyright (c) 1989 Carnegie Mellon University.
39 * All rights reserved.
40 *
41 * Redistribution and use in source and binary forms are permitted
42 * provided that the above copyright notice and this paragraph are
43 * duplicated in all such forms and that any documentation,
44 * advertising materials, and other materials related to such
45 * distribution and use acknowledge that the software was developed
46 * by Carnegie Mellon University. The name of the
47 * University may not be used to endorse or promote products derived
48 * from this software without specific prior written permission.
49 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
50 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
51 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
52 */
53
54#include "lwip/opt.h"
55
56#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
57
58#include "ppp_impl.h"
59#include "pppdebug.h"
60
61#include "auth.h"
62#include "fsm.h"
63#include "vj.h"
64#include "ipcp.h"
65
66#include "lwip/inet.h"
67
68#include <string.h>
69
70/* #define OLD_CI_ADDRS 1 */ /* Support deprecated address negotiation. */
71
72/* global vars */
73ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */
74ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
75ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
76ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
77
78/* local vars */
79static int default_route_set[NUM_PPP]; /* Have set up a default route */
80static int cis_received[NUM_PPP]; /* # Conf-Reqs received */
81
82
83/*
84 * Callbacks for fsm code. (CI = Configuration Information)
85 */
86static void ipcp_resetci (fsm *); /* Reset our CI */
87static int ipcp_cilen (fsm *); /* Return length of our CI */
88static void ipcp_addci (fsm *, u_char *, int *); /* Add our CI */
89static int ipcp_ackci (fsm *, u_char *, int); /* Peer ack'd our CI */
90static int ipcp_nakci (fsm *, u_char *, int); /* Peer nak'd our CI */
91static int ipcp_rejci (fsm *, u_char *, int); /* Peer rej'd our CI */
92static int ipcp_reqci (fsm *, u_char *, int *, int); /* Rcv CI */
93static void ipcp_up (fsm *); /* We're UP */
94static void ipcp_down (fsm *); /* We're DOWN */
95#if PPP_ADDITIONAL_CALLBACKS
96static void ipcp_script (fsm *, char *); /* Run an up/down script */
97#endif
98static void ipcp_finished (fsm *); /* Don't need lower layer */
99
100
101fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
102
103
104static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
105 ipcp_resetci, /* Reset our Configuration Information */
106 ipcp_cilen, /* Length of our Configuration Information */
107 ipcp_addci, /* Add our Configuration Information */
108 ipcp_ackci, /* ACK our Configuration Information */
109 ipcp_nakci, /* NAK our Configuration Information */
110 ipcp_rejci, /* Reject our Configuration Information */
111 ipcp_reqci, /* Request peer's Configuration Information */
112 ipcp_up, /* Called when fsm reaches LS_OPENED state */
113 ipcp_down, /* Called when fsm leaves LS_OPENED state */
114 NULL, /* Called when we want the lower layer up */
115 ipcp_finished, /* Called when we want the lower layer down */
116 NULL, /* Called when Protocol-Reject received */
117 NULL, /* Retransmission is necessary */
118 NULL, /* Called to handle protocol-specific codes */
119 "IPCP" /* String name of protocol */
120};
121
122/*
123 * Protocol entry points from main code.
124 */
125static void ipcp_init (int);
126static void ipcp_open (int);
127static void ipcp_close (int, char *);
128static void ipcp_lowerup (int);
129static void ipcp_lowerdown (int);
130static void ipcp_input (int, u_char *, int);
131static void ipcp_protrej (int);
132
133
134struct protent ipcp_protent = {
135 PPP_IPCP,
136 ipcp_init,
137 ipcp_input,
138 ipcp_protrej,
139 ipcp_lowerup,
140 ipcp_lowerdown,
141 ipcp_open,
142 ipcp_close,
143#if PPP_ADDITIONAL_CALLBACKS
144 ipcp_printpkt,
145 NULL,
146#endif /* PPP_ADDITIONAL_CALLBACKS */
147 1,
148 "IPCP",
149#if PPP_ADDITIONAL_CALLBACKS
150 ip_check_options,
151 NULL,
152 ip_active_pkt
153#endif /* PPP_ADDITIONAL_CALLBACKS */
154};
155
156static void ipcp_clear_addrs (int);
157
158/*
159 * Lengths of configuration options.
160 */
161#define CILEN_VOID 2
162#define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
163#define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
164#define CILEN_ADDR 6 /* new-style single address option */
165#define CILEN_ADDRS 10 /* old-style dual address option */
166
167
168#define CODENAME(x) ((x) == CONFACK ? "ACK" : \
169 (x) == CONFNAK ? "NAK" : "REJ")
170
171
172/*
173 * ipcp_init - Initialize IPCP.
174 */
175static void
176ipcp_init(int unit)
177{
178 fsm *f = &ipcp_fsm[unit];
179 ipcp_options *wo = &ipcp_wantoptions[unit];
180 ipcp_options *ao = &ipcp_allowoptions[unit];
181
182 f->unit = unit;
183 f->protocol = PPP_IPCP;
184 f->callbacks = &ipcp_callbacks;
185 fsm_init(&ipcp_fsm[unit]);
186
187 memset(wo, 0, sizeof(*wo));
188 memset(ao, 0, sizeof(*ao));
189
190 wo->neg_addr = 1;
191 wo->ouraddr = 0;
192#if VJ_SUPPORT
193 wo->neg_vj = 1;
194#else /* VJ_SUPPORT */
195 wo->neg_vj = 0;
196#endif /* VJ_SUPPORT */
197 wo->vj_protocol = IPCP_VJ_COMP;
198 wo->maxslotindex = MAX_SLOTS - 1;
199 wo->cflag = 0;
200 wo->default_route = 1;
201
202 ao->neg_addr = 1;
203#if VJ_SUPPORT
204 ao->neg_vj = 1;
205#else /* VJ_SUPPORT */
206 ao->neg_vj = 0;
207#endif /* VJ_SUPPORT */
208 ao->maxslotindex = MAX_SLOTS - 1;
209 ao->cflag = 1;
210 ao->default_route = 1;
211}
212
213
214/*
215 * ipcp_open - IPCP is allowed to come up.
216 */
217static void
218ipcp_open(int unit)
219{
220 fsm_open(&ipcp_fsm[unit]);
221}
222
223
224/*
225 * ipcp_close - Take IPCP down.
226 */
227static void
228ipcp_close(int unit, char *reason)
229{
230 fsm_close(&ipcp_fsm[unit], reason);
231}
232
233
234/*
235 * ipcp_lowerup - The lower layer is up.
236 */
237static void
238ipcp_lowerup(int unit)
239{
240 fsm_lowerup(&ipcp_fsm[unit]);
241}
242
243
244/*
245 * ipcp_lowerdown - The lower layer is down.
246 */
247static void
248ipcp_lowerdown(int unit)
249{
250 fsm_lowerdown(&ipcp_fsm[unit]);
251}
252
253
254/*
255 * ipcp_input - Input IPCP packet.
256 */
257static void
258ipcp_input(int unit, u_char *p, int len)
259{
260 fsm_input(&ipcp_fsm[unit], p, len);
261}
262
263
264/*
265 * ipcp_protrej - A Protocol-Reject was received for IPCP.
266 *
267 * Pretend the lower layer went down, so we shut up.
268 */
269static void
270ipcp_protrej(int unit)
271{
272 fsm_lowerdown(&ipcp_fsm[unit]);
273}
274
275
276/*
277 * ipcp_resetci - Reset our CI.
278 */
279static void
280ipcp_resetci(fsm *f)
281{
282 ipcp_options *wo = &ipcp_wantoptions[f->unit];
283
284 wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
285 if (wo->ouraddr == 0) {
286 wo->accept_local = 1;
287 }
288 if (wo->hisaddr == 0) {
289 wo->accept_remote = 1;
290 }
291 /* Request DNS addresses from the peer */
292 wo->req_dns1 = ppp_settings.usepeerdns;
293 wo->req_dns2 = ppp_settings.usepeerdns;
294 ipcp_gotoptions[f->unit] = *wo;
295 cis_received[f->unit] = 0;
296}
297
298
299/*
300 * ipcp_cilen - Return length of our CI.
301 */
302static int
303ipcp_cilen(fsm *f)
304{
305 ipcp_options *go = &ipcp_gotoptions[f->unit];
306 ipcp_options *wo = &ipcp_wantoptions[f->unit];
307 ipcp_options *ho = &ipcp_hisoptions[f->unit];
308
309#define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
310#define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
311#define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0)
312
313 /*
314 * First see if we want to change our options to the old
315 * forms because we have received old forms from the peer.
316 */
317 if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
318 /* use the old style of address negotiation */
319 go->neg_addr = 1;
320 go->old_addrs = 1;
321 }
322 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
323 /* try an older style of VJ negotiation */
324 if (cis_received[f->unit] == 0) {
325 /* keep trying the new style until we see some CI from the peer */
326 go->neg_vj = 1;
327 } else {
328 /* use the old style only if the peer did */
329 if (ho->neg_vj && ho->old_vj) {
330 go->neg_vj = 1;
331 go->old_vj = 1;
332 go->vj_protocol = ho->vj_protocol;
333 }
334 }
335 }
336
337 return (LENCIADDR(go->neg_addr, go->old_addrs) +
338 LENCIVJ(go->neg_vj, go->old_vj) +
339 LENCIDNS(go->req_dns1) +
340 LENCIDNS(go->req_dns2));
341}
342
343
344/*
345 * ipcp_addci - Add our desired CIs to a packet.
346 */
347static void
348ipcp_addci(fsm *f, u_char *ucp, int *lenp)
349{
350 ipcp_options *go = &ipcp_gotoptions[f->unit];
351 int len = *lenp;
352
353#define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
354 if (neg) { \
355 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
356 if (len >= vjlen) { \
357 PUTCHAR(opt, ucp); \
358 PUTCHAR(vjlen, ucp); \
359 PUTSHORT(val, ucp); \
360 if (!old) { \
361 PUTCHAR(maxslotindex, ucp); \
362 PUTCHAR(cflag, ucp); \
363 } \
364 len -= vjlen; \
365 } else { \
366 neg = 0; \
367 } \
368 }
369
370#define ADDCIADDR(opt, neg, old, val1, val2) \
371 if (neg) { \
372 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
373 if (len >= addrlen) { \
374 u32_t l; \
375 PUTCHAR(opt, ucp); \
376 PUTCHAR(addrlen, ucp); \
377 l = ntohl(val1); \
378 PUTLONG(l, ucp); \
379 if (old) { \
380 l = ntohl(val2); \
381 PUTLONG(l, ucp); \
382 } \
383 len -= addrlen; \
384 } else { \
385 neg = 0; \
386 } \
387 }
388
389#define ADDCIDNS(opt, neg, addr) \
390 if (neg) { \
391 if (len >= CILEN_ADDR) { \
392 u32_t l; \
393 PUTCHAR(opt, ucp); \
394 PUTCHAR(CILEN_ADDR, ucp); \
395 l = ntohl(addr); \
396 PUTLONG(l, ucp); \
397 len -= CILEN_ADDR; \
398 } else { \
399 neg = 0; \
400 } \
401 }
402
403 ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
404 go->old_addrs, go->ouraddr, go->hisaddr);
405
406 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
407 go->maxslotindex, go->cflag);
408
409 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
410
411 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
412
413 *lenp -= len;
414}
415
416
417/*
418 * ipcp_ackci - Ack our CIs.
419 *
420 * Returns:
421 * 0 - Ack was bad.
422 * 1 - Ack was good.
423 */
424static int
425ipcp_ackci(fsm *f, u_char *p, int len)
426{
427 ipcp_options *go = &ipcp_gotoptions[f->unit];
428 u_short cilen, citype, cishort;
429 u32_t cilong;
430 u_char cimaxslotindex, cicflag;
431
432 /*
433 * CIs must be in exactly the same order that we sent...
434 * Check packet length and CI length at each step.
435 * If we find any deviations, then this packet is bad.
436 */
437
438#define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
439 if (neg) { \
440 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
441 if ((len -= vjlen) < 0) { \
442 goto bad; \
443 } \
444 GETCHAR(citype, p); \
445 GETCHAR(cilen, p); \
446 if (cilen != vjlen || \
447 citype != opt) { \
448 goto bad; \
449 } \
450 GETSHORT(cishort, p); \
451 if (cishort != val) { \
452 goto bad; \
453 } \
454 if (!old) { \
455 GETCHAR(cimaxslotindex, p); \
456 if (cimaxslotindex != maxslotindex) { \
457 goto bad; \
458 } \
459 GETCHAR(cicflag, p); \
460 if (cicflag != cflag) { \
461 goto bad; \
462 } \
463 } \
464 }
465
466#define ACKCIADDR(opt, neg, old, val1, val2) \
467 if (neg) { \
468 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
469 u32_t l; \
470 if ((len -= addrlen) < 0) { \
471 goto bad; \
472 } \
473 GETCHAR(citype, p); \
474 GETCHAR(cilen, p); \
475 if (cilen != addrlen || \
476 citype != opt) { \
477 goto bad; \
478 } \
479 GETLONG(l, p); \
480 cilong = htonl(l); \
481 if (val1 != cilong) { \
482 goto bad; \
483 } \
484 if (old) { \
485 GETLONG(l, p); \
486 cilong = htonl(l); \
487 if (val2 != cilong) { \
488 goto bad; \
489 } \
490 } \
491 }
492
493#define ACKCIDNS(opt, neg, addr) \
494 if (neg) { \
495 u32_t l; \
496 if ((len -= CILEN_ADDR) < 0) { \
497 goto bad; \
498 } \
499 GETCHAR(citype, p); \
500 GETCHAR(cilen, p); \
501 if (cilen != CILEN_ADDR || \
502 citype != opt) { \
503 goto bad; \
504 } \
505 GETLONG(l, p); \
506 cilong = htonl(l); \
507 if (addr != cilong) { \
508 goto bad; \
509 } \
510 }
511
512 ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
513 go->old_addrs, go->ouraddr, go->hisaddr);
514
515 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
516 go->maxslotindex, go->cflag);
517
518 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
519
520 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
521
522 /*
523 * If there are any remaining CIs, then this packet is bad.
524 */
525 if (len != 0) {
526 goto bad;
527 }
528 return (1);
529
530bad:
531 IPCPDEBUG(LOG_INFO, ("ipcp_ackci: received bad Ack!\n"));
532 return (0);
533}
534
535/*
536 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
537 * This should not modify any state if the Nak is bad
538 * or if IPCP is in the LS_OPENED state.
539 *
540 * Returns:
541 * 0 - Nak was bad.
542 * 1 - Nak was good.
543 */
544static int
545ipcp_nakci(fsm *f, u_char *p, int len)
546{
547 ipcp_options *go = &ipcp_gotoptions[f->unit];
548 u_char cimaxslotindex, cicflag;
549 u_char citype, cilen, *next;
550 u_short cishort;
551 u32_t ciaddr1, ciaddr2, l, cidnsaddr;
552 ipcp_options no; /* options we've seen Naks for */
553 ipcp_options try; /* options to request next time */
554
555 BZERO(&no, sizeof(no));
556 try = *go;
557
558 /*
559 * Any Nak'd CIs must be in exactly the same order that we sent.
560 * Check packet length and CI length at each step.
561 * If we find any deviations, then this packet is bad.
562 */
563#define NAKCIADDR(opt, neg, old, code) \
564 if (go->neg && \
565 len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
566 p[1] == cilen && \
567 p[0] == opt) { \
568 len -= cilen; \
569 INCPTR(2, p); \
570 GETLONG(l, p); \
571 ciaddr1 = htonl(l); \
572 if (old) { \
573 GETLONG(l, p); \
574 ciaddr2 = htonl(l); \
575 no.old_addrs = 1; \
576 } else { \
577 ciaddr2 = 0; \
578 } \
579 no.neg = 1; \
580 code \
581 }
582
583#define NAKCIVJ(opt, neg, code) \
584 if (go->neg && \
585 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
586 len >= cilen && \
587 p[0] == opt) { \
588 len -= cilen; \
589 INCPTR(2, p); \
590 GETSHORT(cishort, p); \
591 no.neg = 1; \
592 code \
593 }
594
595#define NAKCIDNS(opt, neg, code) \
596 if (go->neg && \
597 ((cilen = p[1]) == CILEN_ADDR) && \
598 len >= cilen && \
599 p[0] == opt) { \
600 len -= cilen; \
601 INCPTR(2, p); \
602 GETLONG(l, p); \
603 cidnsaddr = htonl(l); \
604 no.neg = 1; \
605 code \
606 }
607
608 /*
609 * Accept the peer's idea of {our,his} address, if different
610 * from our idea, only if the accept_{local,remote} flag is set.
611 */
612 NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs,
613 if (go->accept_local && ciaddr1) { /* Do we know our address? */
614 try.ouraddr = ciaddr1;
615 IPCPDEBUG(LOG_INFO, ("local IP address %s\n",
616 inet_ntoa(ciaddr1)));
617 }
618 if (go->accept_remote && ciaddr2) { /* Does he know his? */
619 try.hisaddr = ciaddr2;
620 IPCPDEBUG(LOG_INFO, ("remote IP address %s\n",
621 inet_ntoa(ciaddr2)));
622 }
623 );
624
625 /*
626 * Accept the peer's value of maxslotindex provided that it
627 * is less than what we asked for. Turn off slot-ID compression
628 * if the peer wants. Send old-style compress-type option if
629 * the peer wants.
630 */
631 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
632 if (cilen == CILEN_VJ) {
633 GETCHAR(cimaxslotindex, p);
634 GETCHAR(cicflag, p);
635 if (cishort == IPCP_VJ_COMP) {
636 try.old_vj = 0;
637 if (cimaxslotindex < go->maxslotindex) {
638 try.maxslotindex = cimaxslotindex;
639 }
640 if (!cicflag) {
641 try.cflag = 0;
642 }
643 } else {
644 try.neg_vj = 0;
645 }
646 } else {
647 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
648 try.old_vj = 1;
649 try.vj_protocol = cishort;
650 } else {
651 try.neg_vj = 0;
652 }
653 }
654 );
655
656 NAKCIDNS(CI_MS_DNS1, req_dns1,
657 try.dnsaddr[0] = cidnsaddr;
658 IPCPDEBUG(LOG_INFO, ("primary DNS address %s\n", inet_ntoa(cidnsaddr)));
659 );
660
661 NAKCIDNS(CI_MS_DNS2, req_dns2,
662 try.dnsaddr[1] = cidnsaddr;
663 IPCPDEBUG(LOG_INFO, ("secondary DNS address %s\n", inet_ntoa(cidnsaddr)));
664 );
665
666 /*
667 * There may be remaining CIs, if the peer is requesting negotiation
668 * on an option that we didn't include in our request packet.
669 * If they want to negotiate about IP addresses, we comply.
670 * If they want us to ask for compression, we refuse.
671 */
672 while (len > CILEN_VOID) {
673 GETCHAR(citype, p);
674 GETCHAR(cilen, p);
675 if( (len -= cilen) < 0 ) {
676 goto bad;
677 }
678 next = p + cilen - 2;
679
680 switch (citype) {
681 case CI_COMPRESSTYPE:
682 if (go->neg_vj || no.neg_vj ||
683 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
684 goto bad;
685 }
686 no.neg_vj = 1;
687 break;
688 case CI_ADDRS:
689 if ((go->neg_addr && go->old_addrs) || no.old_addrs
690 || cilen != CILEN_ADDRS) {
691 goto bad;
692 }
693 try.neg_addr = 1;
694 try.old_addrs = 1;
695 GETLONG(l, p);
696 ciaddr1 = htonl(l);
697 if (ciaddr1 && go->accept_local) {
698 try.ouraddr = ciaddr1;
699 }
700 GETLONG(l, p);
701 ciaddr2 = htonl(l);
702 if (ciaddr2 && go->accept_remote) {
703 try.hisaddr = ciaddr2;
704 }
705 no.old_addrs = 1;
706 break;
707 case CI_ADDR:
708 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) {
709 goto bad;
710 }
711 try.old_addrs = 0;
712 GETLONG(l, p);
713 ciaddr1 = htonl(l);
714 if (ciaddr1 && go->accept_local) {
715 try.ouraddr = ciaddr1;
716 }
717 if (try.ouraddr != 0) {
718 try.neg_addr = 1;
719 }
720 no.neg_addr = 1;
721 break;
722 }
723 p = next;
724 }
725
726 /* If there is still anything left, this packet is bad. */
727 if (len != 0) {
728 goto bad;
729 }
730
731 /*
732 * OK, the Nak is good. Now we can update state.
733 */
734 if (f->state != LS_OPENED) {
735 *go = try;
736 }
737
738 return 1;
739
740bad:
741 IPCPDEBUG(LOG_INFO, ("ipcp_nakci: received bad Nak!\n"));
742 return 0;
743}
744
745
746/*
747 * ipcp_rejci - Reject some of our CIs.
748 */
749static int
750ipcp_rejci(fsm *f, u_char *p, int len)
751{
752 ipcp_options *go = &ipcp_gotoptions[f->unit];
753 u_char cimaxslotindex, ciflag, cilen;
754 u_short cishort;
755 u32_t cilong;
756 ipcp_options try; /* options to request next time */
757
758 try = *go;
759 /*
760 * Any Rejected CIs must be in exactly the same order that we sent.
761 * Check packet length and CI length at each step.
762 * If we find any deviations, then this packet is bad.
763 */
764#define REJCIADDR(opt, neg, old, val1, val2) \
765 if (go->neg && \
766 len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
767 p[1] == cilen && \
768 p[0] == opt) { \
769 u32_t l; \
770 len -= cilen; \
771 INCPTR(2, p); \
772 GETLONG(l, p); \
773 cilong = htonl(l); \
774 /* Check rejected value. */ \
775 if (cilong != val1) { \
776 goto bad; \
777 } \
778 if (old) { \
779 GETLONG(l, p); \
780 cilong = htonl(l); \
781 /* Check rejected value. */ \
782 if (cilong != val2) { \
783 goto bad; \
784 } \
785 } \
786 try.neg = 0; \
787 }
788
789#define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
790 if (go->neg && \
791 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
792 len >= p[1] && \
793 p[0] == opt) { \
794 len -= p[1]; \
795 INCPTR(2, p); \
796 GETSHORT(cishort, p); \
797 /* Check rejected value. */ \
798 if (cishort != val) { \
799 goto bad; \
800 } \
801 if (!old) { \
802 GETCHAR(cimaxslotindex, p); \
803 if (cimaxslotindex != maxslot) { \
804 goto bad; \
805 } \
806 GETCHAR(ciflag, p); \
807 if (ciflag != cflag) { \
808 goto bad; \
809 } \
810 } \
811 try.neg = 0; \
812 }
813
814#define REJCIDNS(opt, neg, dnsaddr) \
815 if (go->neg && \
816 ((cilen = p[1]) == CILEN_ADDR) && \
817 len >= cilen && \
818 p[0] == opt) { \
819 u32_t l; \
820 len -= cilen; \
821 INCPTR(2, p); \
822 GETLONG(l, p); \
823 cilong = htonl(l); \
824 /* Check rejected value. */ \
825 if (cilong != dnsaddr) { \
826 goto bad; \
827 } \
828 try.neg = 0; \
829 }
830
831 REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
832 go->old_addrs, go->ouraddr, go->hisaddr);
833
834 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
835 go->maxslotindex, go->cflag);
836
837 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
838
839 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
840
841 /*
842 * If there are any remaining CIs, then this packet is bad.
843 */
844 if (len != 0) {
845 goto bad;
846 }
847 /*
848 * Now we can update state.
849 */
850 if (f->state != LS_OPENED) {
851 *go = try;
852 }
853 return 1;
854
855bad:
856 IPCPDEBUG(LOG_INFO, ("ipcp_rejci: received bad Reject!\n"));
857 return 0;
858}
859
860
861/*
862 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
863 *
864 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
865 * appropriately. If reject_if_disagree is non-zero, doesn't return
866 * CONFNAK; returns CONFREJ if it can't return CONFACK.
867 */
868static int
869ipcp_reqci(fsm *f, u_char *inp/* Requested CIs */,int *len/* Length of requested CIs */,int reject_if_disagree)
870{
871 ipcp_options *wo = &ipcp_wantoptions[f->unit];
872 ipcp_options *ho = &ipcp_hisoptions[f->unit];
873 ipcp_options *ao = &ipcp_allowoptions[f->unit];
874#ifdef OLD_CI_ADDRS
875 ipcp_options *go = &ipcp_gotoptions[f->unit];
876#endif
877 u_char *cip, *next; /* Pointer to current and next CIs */
878 u_short cilen, citype; /* Parsed len, type */
879 u_short cishort; /* Parsed short value */
880 u32_t tl, ciaddr1; /* Parsed address values */
881#ifdef OLD_CI_ADDRS
882 u32_t ciaddr2; /* Parsed address values */
883#endif
884 int rc = CONFACK; /* Final packet return code */
885 int orc; /* Individual option return code */
886 u_char *p; /* Pointer to next char to parse */
887 u_char *ucp = inp; /* Pointer to current output char */
888 int l = *len; /* Length left */
889 u_char maxslotindex, cflag;
890 int d;
891
892 cis_received[f->unit] = 1;
893
894 /*
895 * Reset all his options.
896 */
897 BZERO(ho, sizeof(*ho));
898
899 /*
900 * Process all his options.
901 */
902 next = inp;
903 while (l) {
904 orc = CONFACK; /* Assume success */
905 cip = p = next; /* Remember begining of CI */
906 if (l < 2 || /* Not enough data for CI header or */
907 p[1] < 2 || /* CI length too small or */
908 p[1] > l) { /* CI length too big? */
909 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: bad CI length!\n"));
910 orc = CONFREJ; /* Reject bad CI */
911 cilen = (u_short)l;/* Reject till end of packet */
912 l = 0; /* Don't loop again */
913 goto endswitch;
914 }
915 GETCHAR(citype, p); /* Parse CI type */
916 GETCHAR(cilen, p); /* Parse CI length */
917 l -= cilen; /* Adjust remaining length */
918 next += cilen; /* Step to next CI */
919
920 switch (citype) { /* Check CI type */
921#ifdef OLD_CI_ADDRS /* Need to save space... */
922 case CI_ADDRS:
923 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received ADDRS\n"));
924 if (!ao->neg_addr ||
925 cilen != CILEN_ADDRS) { /* Check CI length */
926 orc = CONFREJ; /* Reject CI */
927 break;
928 }
929
930 /*
931 * If he has no address, or if we both have his address but
932 * disagree about it, then NAK it with our idea.
933 * In particular, if we don't know his address, but he does,
934 * then accept it.
935 */
936 GETLONG(tl, p); /* Parse source address (his) */
937 ciaddr1 = htonl(tl);
938 IPCPDEBUG(LOG_INFO, ("his addr %s\n", inet_ntoa(ciaddr1)));
939 if (ciaddr1 != wo->hisaddr
940 && (ciaddr1 == 0 || !wo->accept_remote)) {
941 orc = CONFNAK;
942 if (!reject_if_disagree) {
943 DECPTR(sizeof(u32_t), p);
944 tl = ntohl(wo->hisaddr);
945 PUTLONG(tl, p);
946 }
947 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
948 /*
949 * If neither we nor he knows his address, reject the option.
950 */
951 orc = CONFREJ;
952 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
953 break;
954 }
955
956 /*
957 * If he doesn't know our address, or if we both have our address
958 * but disagree about it, then NAK it with our idea.
959 */
960 GETLONG(tl, p); /* Parse desination address (ours) */
961 ciaddr2 = htonl(tl);
962 IPCPDEBUG(LOG_INFO, ("our addr %s\n", inet_ntoa(ciaddr2)));
963 if (ciaddr2 != wo->ouraddr) {
964 if (ciaddr2 == 0 || !wo->accept_local) {
965 orc = CONFNAK;
966 if (!reject_if_disagree) {
967 DECPTR(sizeof(u32_t), p);
968 tl = ntohl(wo->ouraddr);
969 PUTLONG(tl, p);
970 }
971 } else {
972 go->ouraddr = ciaddr2; /* accept peer's idea */
973 }
974 }
975
976 ho->neg_addr = 1;
977 ho->old_addrs = 1;
978 ho->hisaddr = ciaddr1;
979 ho->ouraddr = ciaddr2;
980 break;
981#endif
982
983 case CI_ADDR:
984 if (!ao->neg_addr) {
985 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR not allowed\n"));
986 orc = CONFREJ; /* Reject CI */
987 break;
988 } else if (cilen != CILEN_ADDR) { /* Check CI length */
989 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR bad len\n"));
990 orc = CONFREJ; /* Reject CI */
991 break;
992 }
993
994 /*
995 * If he has no address, or if we both have his address but
996 * disagree about it, then NAK it with our idea.
997 * In particular, if we don't know his address, but he does,
998 * then accept it.
999 */
1000 GETLONG(tl, p); /* Parse source address (his) */
1001 ciaddr1 = htonl(tl);
1002 if (ciaddr1 != wo->hisaddr
1003 && (ciaddr1 == 0 || !wo->accept_remote)) {
1004 orc = CONFNAK;
1005 if (!reject_if_disagree) {
1006 DECPTR(sizeof(u32_t), p);
1007 tl = ntohl(wo->hisaddr);
1008 PUTLONG(tl, p);
1009 }
1010 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Nak ADDR %s\n", inet_ntoa(ciaddr1)));
1011 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1012 /*
1013 * Don't ACK an address of 0.0.0.0 - reject it instead.
1014 */
1015 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR %s\n", inet_ntoa(ciaddr1)));
1016 orc = CONFREJ;
1017 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1018 break;
1019 }
1020
1021 ho->neg_addr = 1;
1022 ho->hisaddr = ciaddr1;
1023 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: ADDR %s\n", inet_ntoa(ciaddr1)));
1024 break;
1025
1026 case CI_MS_DNS1:
1027 case CI_MS_DNS2:
1028 /* Microsoft primary or secondary DNS request */
1029 d = citype == CI_MS_DNS2;
1030
1031 /* If we do not have a DNS address then we cannot send it */
1032 if (ao->dnsaddr[d] == 0 ||
1033 cilen != CILEN_ADDR) { /* Check CI length */
1034 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting DNS%d Request\n", d+1));
1035 orc = CONFREJ; /* Reject CI */
1036 break;
1037 }
1038 GETLONG(tl, p);
1039 if (htonl(tl) != ao->dnsaddr[d]) {
1040 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking DNS%d Request %s\n",
1041 d+1, inet_ntoa(tl)));
1042 DECPTR(sizeof(u32_t), p);
1043 tl = ntohl(ao->dnsaddr[d]);
1044 PUTLONG(tl, p);
1045 orc = CONFNAK;
1046 }
1047 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received DNS%d Request\n", d+1));
1048 break;
1049
1050 case CI_MS_WINS1:
1051 case CI_MS_WINS2:
1052 /* Microsoft primary or secondary WINS request */
1053 d = citype == CI_MS_WINS2;
1054 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received WINS%d Request\n", d+1));
1055
1056 /* If we do not have a DNS address then we cannot send it */
1057 if (ao->winsaddr[d] == 0 ||
1058 cilen != CILEN_ADDR) { /* Check CI length */
1059 orc = CONFREJ; /* Reject CI */
1060 break;
1061 }
1062 GETLONG(tl, p);
1063 if (htonl(tl) != ao->winsaddr[d]) {
1064 DECPTR(sizeof(u32_t), p);
1065 tl = ntohl(ao->winsaddr[d]);
1066 PUTLONG(tl, p);
1067 orc = CONFNAK;
1068 }
1069 break;
1070
1071 case CI_COMPRESSTYPE:
1072 if (!ao->neg_vj) {
1073 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE not allowed\n"));
1074 orc = CONFREJ;
1075 break;
1076 } else if (cilen != CILEN_VJ && cilen != CILEN_COMPRESS) {
1077 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE len=%d\n", cilen));
1078 orc = CONFREJ;
1079 break;
1080 }
1081 GETSHORT(cishort, p);
1082
1083 if (!(cishort == IPCP_VJ_COMP ||
1084 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1085 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE %d\n", cishort));
1086 orc = CONFREJ;
1087 break;
1088 }
1089
1090 ho->neg_vj = 1;
1091 ho->vj_protocol = cishort;
1092 if (cilen == CILEN_VJ) {
1093 GETCHAR(maxslotindex, p);
1094 if (maxslotindex > ao->maxslotindex) {
1095 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking VJ max slot %d\n", maxslotindex));
1096 orc = CONFNAK;
1097 if (!reject_if_disagree) {
1098 DECPTR(1, p);
1099 PUTCHAR(ao->maxslotindex, p);
1100 }
1101 }
1102 GETCHAR(cflag, p);
1103 if (cflag && !ao->cflag) {
1104 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking VJ cflag %d\n", cflag));
1105 orc = CONFNAK;
1106 if (!reject_if_disagree) {
1107 DECPTR(1, p);
1108 PUTCHAR(wo->cflag, p);
1109 }
1110 }
1111 ho->maxslotindex = maxslotindex;
1112 ho->cflag = cflag;
1113 } else {
1114 ho->old_vj = 1;
1115 ho->maxslotindex = MAX_SLOTS - 1;
1116 ho->cflag = 1;
1117 }
1118 IPCPDEBUG(LOG_INFO, (
1119 "ipcp_reqci: received COMPRESSTYPE p=%d old=%d maxslot=%d cflag=%d\n",
1120 ho->vj_protocol, ho->old_vj, ho->maxslotindex, ho->cflag));
1121 break;
1122
1123 default:
1124 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting unknown CI type %d\n", citype));
1125 orc = CONFREJ;
1126 break;
1127 }
1128
1129endswitch:
1130 if (orc == CONFACK && /* Good CI */
1131 rc != CONFACK) { /* but prior CI wasnt? */
1132 continue; /* Don't send this one */
1133 }
1134
1135 if (orc == CONFNAK) { /* Nak this CI? */
1136 if (reject_if_disagree) { /* Getting fed up with sending NAKs? */
1137 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting too many naks\n"));
1138 orc = CONFREJ; /* Get tough if so */
1139 } else {
1140 if (rc == CONFREJ) { /* Rejecting prior CI? */
1141 continue; /* Don't send this one */
1142 }
1143 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1144 rc = CONFNAK; /* Not anymore... */
1145 ucp = inp; /* Backup */
1146 }
1147 }
1148 }
1149
1150 if (orc == CONFREJ && /* Reject this CI */
1151 rc != CONFREJ) { /* but no prior ones? */
1152 rc = CONFREJ;
1153 ucp = inp; /* Backup */
1154 }
1155
1156 /* Need to move CI? */
1157 if (ucp != cip) {
1158 BCOPY(cip, ucp, cilen); /* Move it */
1159 }
1160
1161 /* Update output pointer */
1162 INCPTR(cilen, ucp);
1163 }
1164
1165 /*
1166 * If we aren't rejecting this packet, and we want to negotiate
1167 * their address, and they didn't send their address, then we
1168 * send a NAK with a CI_ADDR option appended. We assume the
1169 * input buffer is long enough that we can append the extra
1170 * option safely.
1171 */
1172 if (rc != CONFREJ && !ho->neg_addr &&
1173 wo->req_addr && !reject_if_disagree) {
1174 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Requesting peer address\n"));
1175 if (rc == CONFACK) {
1176 rc = CONFNAK;
1177 ucp = inp; /* reset pointer */
1178 wo->req_addr = 0; /* don't ask again */
1179 }
1180 PUTCHAR(CI_ADDR, ucp);
1181 PUTCHAR(CILEN_ADDR, ucp);
1182 tl = ntohl(wo->hisaddr);
1183 PUTLONG(tl, ucp);
1184 }
1185
1186 *len = (int)(ucp - inp); /* Compute output length */
1187 IPCPDEBUG(LOG_INFO, ("ipcp_reqci: returning Configure-%s\n", CODENAME(rc)));
1188 return (rc); /* Return final code */
1189}
1190
1191
1192#if 0
1193/*
1194 * ip_check_options - check that any IP-related options are OK,
1195 * and assign appropriate defaults.
1196 */
1197static void
1198ip_check_options(u_long localAddr)
1199{
1200 ipcp_options *wo = &ipcp_wantoptions[0];
1201
1202 /*
1203 * Load our default IP address but allow the remote host to give us
1204 * a new address.
1205 */
1206 if (wo->ouraddr == 0 && !ppp_settings.disable_defaultip) {
1207 wo->accept_local = 1; /* don't insist on this default value */
1208 wo->ouraddr = htonl(localAddr);
1209 }
1210}
1211#endif
1212
1213
1214/*
1215 * ipcp_up - IPCP has come UP.
1216 *
1217 * Configure the IP network interface appropriately and bring it up.
1218 */
1219static void
1220ipcp_up(fsm *f)
1221{
1222 u32_t mask;
1223 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1224 ipcp_options *go = &ipcp_gotoptions[f->unit];
1225 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1226
1227 np_up(f->unit, PPP_IP);
1228 IPCPDEBUG(LOG_INFO, ("ipcp: up\n"));
1229
1230 /*
1231 * We must have a non-zero IP address for both ends of the link.
1232 */
1233 if (!ho->neg_addr) {
1234 ho->hisaddr = wo->hisaddr;
1235 }
1236
1237 if (ho->hisaddr == 0) {
1238 IPCPDEBUG(LOG_ERR, ("Could not determine remote IP address\n"));
1239 ipcp_close(f->unit, "Could not determine remote IP address");
1240 return;
1241 }
1242 if (go->ouraddr == 0) {
1243 IPCPDEBUG(LOG_ERR, ("Could not determine local IP address\n"));
1244 ipcp_close(f->unit, "Could not determine local IP address");
1245 return;
1246 }
1247
1248 if (ppp_settings.usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1249 /*pppGotDNSAddrs(go->dnsaddr[0], go->dnsaddr[1]);*/
1250 }
1251
1252 /*
1253 * Check that the peer is allowed to use the IP address it wants.
1254 */
1255 if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1256 IPCPDEBUG(LOG_ERR, ("Peer is not authorized to use remote address %s\n",
1257 inet_ntoa(ho->hisaddr)));
1258 ipcp_close(f->unit, "Unauthorized remote IP address");
1259 return;
1260 }
1261
1262 /* set tcp compression */
1263 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1264
1265 /*
1266 * Set IP addresses and (if specified) netmask.
1267 */
1268 mask = GetMask(go->ouraddr);
1269
1270 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask, go->dnsaddr[0], go->dnsaddr[1])) {
1271 IPCPDEBUG(LOG_WARNING, ("sifaddr failed\n"));
1272 ipcp_close(f->unit, "Interface configuration failed");
1273 return;
1274 }
1275
1276 /* bring the interface up for IP */
1277 if (!sifup(f->unit)) {
1278 IPCPDEBUG(LOG_WARNING, ("sifup failed\n"));
1279 ipcp_close(f->unit, "Interface configuration failed");
1280 return;
1281 }
1282
1283 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1284
1285 /* assign a default route through the interface if required */
1286 if (ipcp_wantoptions[f->unit].default_route) {
1287 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) {
1288 default_route_set[f->unit] = 1;
1289 }
1290 }
1291
1292 IPCPDEBUG(LOG_NOTICE, ("local IP address %s\n", inet_ntoa(go->ouraddr)));
1293 IPCPDEBUG(LOG_NOTICE, ("remote IP address %s\n", inet_ntoa(ho->hisaddr)));
1294 if (go->dnsaddr[0]) {
1295 IPCPDEBUG(LOG_NOTICE, ("primary DNS address %s\n", inet_ntoa(go->dnsaddr[0])));
1296 }
1297 if (go->dnsaddr[1]) {
1298 IPCPDEBUG(LOG_NOTICE, ("secondary DNS address %s\n", inet_ntoa(go->dnsaddr[1])));
1299 }
1300}
1301
1302
1303/*
1304 * ipcp_down - IPCP has gone DOWN.
1305 *
1306 * Take the IP network interface down, clear its addresses
1307 * and delete routes through it.
1308 */
1309static void
1310ipcp_down(fsm *f)
1311{
1312 IPCPDEBUG(LOG_INFO, ("ipcp: down\n"));
1313 np_down(f->unit, PPP_IP);
1314 sifvjcomp(f->unit, 0, 0, 0);
1315
1316 sifdown(f->unit);
1317 ipcp_clear_addrs(f->unit);
1318}
1319
1320
1321/*
1322 * ipcp_clear_addrs() - clear the interface addresses, routes, etc.
1323 */
1324static void
1325ipcp_clear_addrs(int unit)
1326{
1327 u32_t ouraddr, hisaddr;
1328
1329 ouraddr = ipcp_gotoptions[unit].ouraddr;
1330 hisaddr = ipcp_hisoptions[unit].hisaddr;
1331 if (default_route_set[unit]) {
1332 cifdefaultroute(unit, ouraddr, hisaddr);
1333 default_route_set[unit] = 0;
1334 }
1335 cifaddr(unit, ouraddr, hisaddr);
1336}
1337
1338
1339/*
1340 * ipcp_finished - possibly shut down the lower layers.
1341 */
1342static void
1343ipcp_finished(fsm *f)
1344{
1345 np_finished(f->unit, PPP_IP);
1346}
1347
1348#if PPP_ADDITIONAL_CALLBACKS
1349static int
1350ipcp_printpkt(u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
1351{
1352 LWIP_UNUSED_ARG(p);
1353 LWIP_UNUSED_ARG(plen);
1354 LWIP_UNUSED_ARG(printer);
1355 LWIP_UNUSED_ARG(arg);
1356 return 0;
1357}
1358
1359/*
1360 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
1361 * We don't bring the link up for IP fragments or for TCP FIN packets
1362 * with no data.
1363 */
1364#define IP_HDRLEN 20 /* bytes */
1365#define IP_OFFMASK 0x1fff
1366#define IPPROTO_TCP 6
1367#define TCP_HDRLEN 20
1368#define TH_FIN 0x01
1369
1370/*
1371 * We use these macros because the IP header may be at an odd address,
1372 * and some compilers might use word loads to get th_off or ip_hl.
1373 */
1374
1375#define net_short(x) (((x)[0] << 8) + (x)[1])
1376#define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
1377#define get_ipoff(x) net_short((unsigned char *)(x) + 6)
1378#define get_ipproto(x) (((unsigned char *)(x))[9])
1379#define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1380#define get_tcpflags(x) (((unsigned char *)(x))[13])
1381
1382static int
1383ip_active_pkt(u_char *pkt, int len)
1384{
1385 u_char *tcp;
1386 int hlen;
1387
1388 len -= PPP_HDRLEN;
1389 pkt += PPP_HDRLEN;
1390 if (len < IP_HDRLEN) {
1391 return 0;
1392 }
1393 if ((get_ipoff(pkt) & IP_OFFMASK) != 0) {
1394 return 0;
1395 }
1396 if (get_ipproto(pkt) != IPPROTO_TCP) {
1397 return 1;
1398 }
1399 hlen = get_iphl(pkt) * 4;
1400 if (len < hlen + TCP_HDRLEN) {
1401 return 0;
1402 }
1403 tcp = pkt + hlen;
1404 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) {
1405 return 0;
1406 }
1407 return 1;
1408}
1409#endif /* PPP_ADDITIONAL_CALLBACKS */
1410
1411#endif /* PPP_SUPPORT */
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