source: azure_iot_hub_f767zi/trunk/asp_baseplatform/lwip/lwip-2.1.2/src/netif/ppp/ipv6cp.c@ 464

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WolfSSLとAzure IoT SDKを更新
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1/*
2 * ipv6cp.c - PPP IPV6 Control Protocol.
3 *
4 * Copyright (c) 1999 Tommi Komulainen. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * 3. The name(s) of the authors of this software must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission.
21 *
22 * 4. Redistributions of any form whatsoever must retain the following
23 * acknowledgment:
24 * "This product includes software developed by Tommi Komulainen
25 * <Tommi.Komulainen@iki.fi>".
26 *
27 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
28 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
29 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
30 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
31 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
32 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
33 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
34 *
35 */
36
37/* Original version, based on RFC2023 :
38
39 Copyright (c) 1995, 1996, 1997 Francis.Dupont@inria.fr, INRIA Rocquencourt,
40 Alain.Durand@imag.fr, IMAG,
41 Jean-Luc.Richier@imag.fr, IMAG-LSR.
42
43 Copyright (c) 1998, 1999 Francis.Dupont@inria.fr, GIE DYADE,
44 Alain.Durand@imag.fr, IMAG,
45 Jean-Luc.Richier@imag.fr, IMAG-LSR.
46
47 Ce travail a été fait au sein du GIE DYADE (Groupement d'Intérêt
48 Économique ayant pour membres BULL S.A. et l'INRIA).
49
50 Ce logiciel informatique est disponible aux conditions
51 usuelles dans la recherche, c'est-à-dire qu'il peut
52 être utilisé, copié, modifié, distribué à l'unique
53 condition que ce texte soit conservé afin que
54 l'origine de ce logiciel soit reconnue.
55
56 Le nom de l'Institut National de Recherche en Informatique
57 et en Automatique (INRIA), de l'IMAG, ou d'une personne morale
58 ou physique ayant participé à l'élaboration de ce logiciel ne peut
59 être utilisé sans son accord préalable explicite.
60
61 Ce logiciel est fourni tel quel sans aucune garantie,
62 support ou responsabilité d'aucune sorte.
63 Ce logiciel est dérivé de sources d'origine
64 "University of California at Berkeley" et
65 "Digital Equipment Corporation" couvertes par des copyrights.
66
67 L'Institut d'Informatique et de Mathématiques Appliquées de Grenoble (IMAG)
68 est une fédération d'unités mixtes de recherche du CNRS, de l'Institut National
69 Polytechnique de Grenoble et de l'Université Joseph Fourier regroupant
70 sept laboratoires dont le laboratoire Logiciels, Systèmes, Réseaux (LSR).
71
72 This work has been done in the context of GIE DYADE (joint R & D venture
73 between BULL S.A. and INRIA).
74
75 This software is available with usual "research" terms
76 with the aim of retain credits of the software.
77 Permission to use, copy, modify and distribute this software for any
78 purpose and without fee is hereby granted, provided that the above
79 copyright notice and this permission notice appear in all copies,
80 and the name of INRIA, IMAG, or any contributor not be used in advertising
81 or publicity pertaining to this material without the prior explicit
82 permission. The software is provided "as is" without any
83 warranties, support or liabilities of any kind.
84 This software is derived from source code from
85 "University of California at Berkeley" and
86 "Digital Equipment Corporation" protected by copyrights.
87
88 Grenoble's Institute of Computer Science and Applied Mathematics (IMAG)
89 is a federation of seven research units funded by the CNRS, National
90 Polytechnic Institute of Grenoble and University Joseph Fourier.
91 The research unit in Software, Systems, Networks (LSR) is member of IMAG.
92*/
93
94/*
95 * Derived from :
96 *
97 *
98 * ipcp.c - PPP IP Control Protocol.
99 *
100 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
101 *
102 * Redistribution and use in source and binary forms, with or without
103 * modification, are permitted provided that the following conditions
104 * are met:
105 *
106 * 1. Redistributions of source code must retain the above copyright
107 * notice, this list of conditions and the following disclaimer.
108 *
109 * 2. Redistributions in binary form must reproduce the above copyright
110 * notice, this list of conditions and the following disclaimer in
111 * the documentation and/or other materials provided with the
112 * distribution.
113 *
114 * 3. The name "Carnegie Mellon University" must not be used to
115 * endorse or promote products derived from this software without
116 * prior written permission. For permission or any legal
117 * details, please contact
118 * Office of Technology Transfer
119 * Carnegie Mellon University
120 * 5000 Forbes Avenue
121 * Pittsburgh, PA 15213-3890
122 * (412) 268-4387, fax: (412) 268-7395
123 * tech-transfer@andrew.cmu.edu
124 *
125 * 4. Redistributions of any form whatsoever must retain the following
126 * acknowledgment:
127 * "This product includes software developed by Computing Services
128 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
129 *
130 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
131 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
132 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
133 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
134 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
135 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
136 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
137 *
138 * $Id$
139 */
140
141/*
142 * @todo:
143 *
144 * Proxy Neighbour Discovery.
145 *
146 * Better defines for selecting the ordering of
147 * interface up / set address.
148 */
149
150#include "netif/ppp/ppp_opts.h"
151#if PPP_SUPPORT && PPP_IPV6_SUPPORT /* don't build if not configured for use in lwipopts.h */
152
153#if 0 /* UNUSED */
154#include <stdio.h>
155#include <string.h>
156#include <unistd.h>
157#include <netdb.h>
158#include <sys/param.h>
159#include <sys/types.h>
160#include <sys/socket.h>
161#include <netinet/in.h>
162#include <arpa/inet.h>
163#endif /* UNUSED */
164
165#include "netif/ppp/ppp_impl.h"
166#include "netif/ppp/fsm.h"
167#include "netif/ppp/ipcp.h"
168#include "netif/ppp/ipv6cp.h"
169#include "netif/ppp/magic.h"
170
171/* global vars */
172#if 0 /* UNUSED */
173int no_ifaceid_neg = 0;
174#endif /* UNUSED */
175
176/*
177 * Callbacks for fsm code. (CI = Configuration Information)
178 */
179static void ipv6cp_resetci(fsm *f); /* Reset our CI */
180static int ipv6cp_cilen(fsm *f); /* Return length of our CI */
181static void ipv6cp_addci(fsm *f, u_char *ucp, int *lenp); /* Add our CI */
182static int ipv6cp_ackci(fsm *f, u_char *p, int len); /* Peer ack'd our CI */
183static int ipv6cp_nakci(fsm *f, u_char *p, int len, int treat_as_reject); /* Peer nak'd our CI */
184static int ipv6cp_rejci(fsm *f, u_char *p, int len); /* Peer rej'd our CI */
185static int ipv6cp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree); /* Rcv CI */
186static void ipv6cp_up(fsm *f); /* We're UP */
187static void ipv6cp_down(fsm *f); /* We're DOWN */
188static void ipv6cp_finished(fsm *f); /* Don't need lower layer */
189
190static const fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */
191 ipv6cp_resetci, /* Reset our Configuration Information */
192 ipv6cp_cilen, /* Length of our Configuration Information */
193 ipv6cp_addci, /* Add our Configuration Information */
194 ipv6cp_ackci, /* ACK our Configuration Information */
195 ipv6cp_nakci, /* NAK our Configuration Information */
196 ipv6cp_rejci, /* Reject our Configuration Information */
197 ipv6cp_reqci, /* Request peer's Configuration Information */
198 ipv6cp_up, /* Called when fsm reaches OPENED state */
199 ipv6cp_down, /* Called when fsm leaves OPENED state */
200 NULL, /* Called when we want the lower layer up */
201 ipv6cp_finished, /* Called when we want the lower layer down */
202 NULL, /* Called when Protocol-Reject received */
203 NULL, /* Retransmission is necessary */
204 NULL, /* Called to handle protocol-specific codes */
205 "IPV6CP" /* String name of protocol */
206};
207
208#if PPP_OPTIONS
209/*
210 * Command-line options.
211 */
212static int setifaceid(char **arg));
213static void printifaceid(option_t *,
214 void (*)(void *, char *, ...), void *));
215
216static option_t ipv6cp_option_list[] = {
217 { "ipv6", o_special, (void *)setifaceid,
218 "Set interface identifiers for IPV6",
219 OPT_A2PRINTER, (void *)printifaceid },
220
221 { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag,
222 "Enable IPv6 and IPv6CP", OPT_PRIO | 1 },
223 { "noipv6", o_bool, &ipv6cp_protent.enabled_flag,
224 "Disable IPv6 and IPv6CP", OPT_PRIOSUB },
225 { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag,
226 "Disable IPv6 and IPv6CP", OPT_PRIOSUB | OPT_ALIAS },
227
228 { "ipv6cp-accept-local", o_bool, &ipv6cp_allowoptions[0].accept_local,
229 "Accept peer's interface identifier for us", 1 },
230
231 { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip,
232 "Use (default) IPv4 address as interface identifier", 1 },
233
234 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent,
235 "Use uniquely-available persistent value for link local address", 1 },
236
237 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime,
238 "Set timeout for IPv6CP", OPT_PRIO },
239 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits,
240 "Set max #xmits for term-reqs", OPT_PRIO },
241 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits,
242 "Set max #xmits for conf-reqs", OPT_PRIO },
243 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops,
244 "Set max #conf-naks for IPv6CP", OPT_PRIO },
245
246 { NULL }
247};
248#endif /* PPP_OPTIONS */
249
250/*
251 * Protocol entry points from main code.
252 */
253static void ipv6cp_init(ppp_pcb *pcb);
254static void ipv6cp_open(ppp_pcb *pcb);
255static void ipv6cp_close(ppp_pcb *pcb, const char *reason);
256static void ipv6cp_lowerup(ppp_pcb *pcb);
257static void ipv6cp_lowerdown(ppp_pcb *pcb);
258static void ipv6cp_input(ppp_pcb *pcb, u_char *p, int len);
259static void ipv6cp_protrej(ppp_pcb *pcb);
260#if PPP_OPTIONS
261static void ipv6_check_options(void);
262#endif /* PPP_OPTIONS */
263#if DEMAND_SUPPORT
264static int ipv6_demand_conf(int u);
265#endif /* DEMAND_SUPPORT */
266#if PRINTPKT_SUPPORT
267static int ipv6cp_printpkt(const u_char *p, int plen,
268 void (*printer)(void *, const char *, ...), void *arg);
269#endif /* PRINTPKT_SUPPORT */
270#if DEMAND_SUPPORT
271static int ipv6_active_pkt(u_char *pkt, int len);
272#endif /* DEMAND_SUPPORT */
273
274const struct protent ipv6cp_protent = {
275 PPP_IPV6CP,
276 ipv6cp_init,
277 ipv6cp_input,
278 ipv6cp_protrej,
279 ipv6cp_lowerup,
280 ipv6cp_lowerdown,
281 ipv6cp_open,
282 ipv6cp_close,
283#if PRINTPKT_SUPPORT
284 ipv6cp_printpkt,
285#endif /* PRINTPKT_SUPPORT */
286#if PPP_DATAINPUT
287 NULL,
288#endif /* PPP_DATAINPUT */
289#if PRINTPKT_SUPPORT
290 "IPV6CP",
291 "IPV6",
292#endif /* PRINTPKT_SUPPORT */
293#if PPP_OPTIONS
294 ipv6cp_option_list,
295 ipv6_check_options,
296#endif /* PPP_OPTIONS */
297#if DEMAND_SUPPORT
298 ipv6_demand_conf,
299 ipv6_active_pkt
300#endif /* DEMAND_SUPPORT */
301};
302
303static void ipv6cp_clear_addrs(ppp_pcb *pcb, eui64_t ourid, eui64_t hisid);
304#if 0 /* UNUSED */
305static void ipv6cp_script(char *));
306static void ipv6cp_script_done(void *));
307#endif /* UNUSED */
308
309/*
310 * Lengths of configuration options.
311 */
312#define CILEN_VOID 2
313#define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */
314#define CILEN_IFACEID 10 /* RFC2472, interface identifier */
315
316#define CODENAME(x) ((x) == CONFACK ? "ACK" : \
317 (x) == CONFNAK ? "NAK" : "REJ")
318
319#if 0 /* UNUSED */
320/*
321 * This state variable is used to ensure that we don't
322 * run an ipcp-up/down script while one is already running.
323 */
324static enum script_state {
325 s_down,
326 s_up,
327} ipv6cp_script_state;
328static pid_t ipv6cp_script_pid;
329#endif /* UNUSED */
330
331static char *llv6_ntoa(eui64_t ifaceid);
332
333#if PPP_OPTIONS
334/*
335 * setifaceid - set the interface identifiers manually
336 */
337static int
338setifaceid(argv)
339 char **argv;
340{
341 char *comma, *arg, c;
342 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
343 struct in6_addr addr;
344 static int prio_local, prio_remote;
345
346#define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \
347 (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) )
348
349 arg = *argv;
350 if ((comma = strchr(arg, ',')) == NULL)
351 comma = arg + strlen(arg);
352
353 /*
354 * If comma first character, then no local identifier
355 */
356 if (comma != arg) {
357 c = *comma;
358 *comma = '\0';
359
360 if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) {
361 option_error("Illegal interface identifier (local): %s", arg);
362 return 0;
363 }
364
365 if (option_priority >= prio_local) {
366 eui64_copy(addr.s6_addr32[2], wo->ourid);
367 wo->opt_local = 1;
368 prio_local = option_priority;
369 }
370 *comma = c;
371 }
372
373 /*
374 * If comma last character, the no remote identifier
375 */
376 if (*comma != 0 && *++comma != '\0') {
377 if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) {
378 option_error("Illegal interface identifier (remote): %s", comma);
379 return 0;
380 }
381 if (option_priority >= prio_remote) {
382 eui64_copy(addr.s6_addr32[2], wo->hisid);
383 wo->opt_remote = 1;
384 prio_remote = option_priority;
385 }
386 }
387
388 if (override_value("+ipv6", option_priority, option_source))
389 ipv6cp_protent.enabled_flag = 1;
390 return 1;
391}
392
393static void
394printifaceid(opt, printer, arg)
395 option_t *opt;
396 void (*printer)(void *, char *, ...));
397 void *arg;
398{
399 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
400
401 if (wo->opt_local)
402 printer(arg, "%s", llv6_ntoa(wo->ourid));
403 printer(arg, ",");
404 if (wo->opt_remote)
405 printer(arg, "%s", llv6_ntoa(wo->hisid));
406}
407#endif /* PPP_OPTIONS */
408
409/*
410 * Make a string representation of a network address.
411 */
412static char *
413llv6_ntoa(eui64_t ifaceid)
414{
415 static char b[26];
416
417 sprintf(b, "fe80::%02x%02x:%02x%02x:%02x%02x:%02x%02x",
418 ifaceid.e8[0], ifaceid.e8[1], ifaceid.e8[2], ifaceid.e8[3],
419 ifaceid.e8[4], ifaceid.e8[5], ifaceid.e8[6], ifaceid.e8[7]);
420
421 return b;
422}
423
424
425/*
426 * ipv6cp_init - Initialize IPV6CP.
427 */
428static void ipv6cp_init(ppp_pcb *pcb) {
429 fsm *f = &pcb->ipv6cp_fsm;
430 ipv6cp_options *wo = &pcb->ipv6cp_wantoptions;
431 ipv6cp_options *ao = &pcb->ipv6cp_allowoptions;
432
433 f->pcb = pcb;
434 f->protocol = PPP_IPV6CP;
435 f->callbacks = &ipv6cp_callbacks;
436 fsm_init(f);
437
438#if 0 /* Not necessary, everything is cleared in ppp_new() */
439 memset(wo, 0, sizeof(*wo));
440 memset(ao, 0, sizeof(*ao));
441#endif /* 0 */
442
443 wo->accept_local = 1;
444 wo->neg_ifaceid = 1;
445 ao->neg_ifaceid = 1;
446
447#ifdef IPV6CP_COMP
448 wo->neg_vj = 1;
449 ao->neg_vj = 1;
450 wo->vj_protocol = IPV6CP_COMP;
451#endif
452
453}
454
455
456/*
457 * ipv6cp_open - IPV6CP is allowed to come up.
458 */
459static void ipv6cp_open(ppp_pcb *pcb) {
460 fsm_open(&pcb->ipv6cp_fsm);
461}
462
463
464/*
465 * ipv6cp_close - Take IPV6CP down.
466 */
467static void ipv6cp_close(ppp_pcb *pcb, const char *reason) {
468 fsm_close(&pcb->ipv6cp_fsm, reason);
469}
470
471
472/*
473 * ipv6cp_lowerup - The lower layer is up.
474 */
475static void ipv6cp_lowerup(ppp_pcb *pcb) {
476 fsm_lowerup(&pcb->ipv6cp_fsm);
477}
478
479
480/*
481 * ipv6cp_lowerdown - The lower layer is down.
482 */
483static void ipv6cp_lowerdown(ppp_pcb *pcb) {
484 fsm_lowerdown(&pcb->ipv6cp_fsm);
485}
486
487
488/*
489 * ipv6cp_input - Input IPV6CP packet.
490 */
491static void ipv6cp_input(ppp_pcb *pcb, u_char *p, int len) {
492 fsm_input(&pcb->ipv6cp_fsm, p, len);
493}
494
495
496/*
497 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP.
498 *
499 * Pretend the lower layer went down, so we shut up.
500 */
501static void ipv6cp_protrej(ppp_pcb *pcb) {
502 fsm_lowerdown(&pcb->ipv6cp_fsm);
503}
504
505
506/*
507 * ipv6cp_resetci - Reset our CI.
508 */
509static void ipv6cp_resetci(fsm *f) {
510 ppp_pcb *pcb = f->pcb;
511 ipv6cp_options *wo = &pcb->ipv6cp_wantoptions;
512 ipv6cp_options *go = &pcb->ipv6cp_gotoptions;
513 ipv6cp_options *ao = &pcb->ipv6cp_allowoptions;
514
515 wo->req_ifaceid = wo->neg_ifaceid && ao->neg_ifaceid;
516
517 if (!wo->opt_local) {
518 eui64_magic_nz(wo->ourid);
519 }
520
521 *go = *wo;
522 eui64_zero(go->hisid); /* last proposed interface identifier */
523}
524
525
526/*
527 * ipv6cp_cilen - Return length of our CI.
528 */
529static int ipv6cp_cilen(fsm *f) {
530 ppp_pcb *pcb = f->pcb;
531 ipv6cp_options *go = &pcb->ipv6cp_gotoptions;
532
533#ifdef IPV6CP_COMP
534#define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0)
535#endif /* IPV6CP_COMP */
536#define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0)
537
538 return (LENCIIFACEID(go->neg_ifaceid) +
539#ifdef IPV6CP_COMP
540 LENCIVJ(go->neg_vj) +
541#endif /* IPV6CP_COMP */
542 0);
543}
544
545
546/*
547 * ipv6cp_addci - Add our desired CIs to a packet.
548 */
549static void ipv6cp_addci(fsm *f, u_char *ucp, int *lenp) {
550 ppp_pcb *pcb = f->pcb;
551 ipv6cp_options *go = &pcb->ipv6cp_gotoptions;
552 int len = *lenp;
553
554#ifdef IPV6CP_COMP
555#define ADDCIVJ(opt, neg, val) \
556 if (neg) { \
557 int vjlen = CILEN_COMPRESS; \
558 if (len >= vjlen) { \
559 PUTCHAR(opt, ucp); \
560 PUTCHAR(vjlen, ucp); \
561 PUTSHORT(val, ucp); \
562 len -= vjlen; \
563 } else \
564 neg = 0; \
565 }
566#endif /* IPV6CP_COMP */
567
568#define ADDCIIFACEID(opt, neg, val1) \
569 if (neg) { \
570 int idlen = CILEN_IFACEID; \
571 if (len >= idlen) { \
572 PUTCHAR(opt, ucp); \
573 PUTCHAR(idlen, ucp); \
574 eui64_put(val1, ucp); \
575 len -= idlen; \
576 } else \
577 neg = 0; \
578 }
579
580 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
581
582#ifdef IPV6CP_COMP
583 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
584#endif /* IPV6CP_COMP */
585
586 *lenp -= len;
587}
588
589
590/*
591 * ipv6cp_ackci - Ack our CIs.
592 *
593 * Returns:
594 * 0 - Ack was bad.
595 * 1 - Ack was good.
596 */
597static int ipv6cp_ackci(fsm *f, u_char *p, int len) {
598 ppp_pcb *pcb = f->pcb;
599 ipv6cp_options *go = &pcb->ipv6cp_gotoptions;
600 u_short cilen, citype;
601#ifdef IPV6CP_COMP
602 u_short cishort;
603#endif /* IPV6CP_COMP */
604 eui64_t ifaceid;
605
606 /*
607 * CIs must be in exactly the same order that we sent...
608 * Check packet length and CI length at each step.
609 * If we find any deviations, then this packet is bad.
610 */
611
612#ifdef IPV6CP_COMP
613#define ACKCIVJ(opt, neg, val) \
614 if (neg) { \
615 int vjlen = CILEN_COMPRESS; \
616 if ((len -= vjlen) < 0) \
617 goto bad; \
618 GETCHAR(citype, p); \
619 GETCHAR(cilen, p); \
620 if (cilen != vjlen || \
621 citype != opt) \
622 goto bad; \
623 GETSHORT(cishort, p); \
624 if (cishort != val) \
625 goto bad; \
626 }
627#endif /* IPV6CP_COMP */
628
629#define ACKCIIFACEID(opt, neg, val1) \
630 if (neg) { \
631 int idlen = CILEN_IFACEID; \
632 if ((len -= idlen) < 0) \
633 goto bad; \
634 GETCHAR(citype, p); \
635 GETCHAR(cilen, p); \
636 if (cilen != idlen || \
637 citype != opt) \
638 goto bad; \
639 eui64_get(ifaceid, p); \
640 if (! eui64_equals(val1, ifaceid)) \
641 goto bad; \
642 }
643
644 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
645
646#ifdef IPV6CP_COMP
647 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
648#endif /* IPV6CP_COMP */
649
650 /*
651 * If there are any remaining CIs, then this packet is bad.
652 */
653 if (len != 0)
654 goto bad;
655 return (1);
656
657bad:
658 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!"));
659 return (0);
660}
661
662/*
663 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs.
664 * This should not modify any state if the Nak is bad
665 * or if IPV6CP is in the OPENED state.
666 *
667 * Returns:
668 * 0 - Nak was bad.
669 * 1 - Nak was good.
670 */
671static int ipv6cp_nakci(fsm *f, u_char *p, int len, int treat_as_reject) {
672 ppp_pcb *pcb = f->pcb;
673 ipv6cp_options *go = &pcb->ipv6cp_gotoptions;
674 u_char citype, cilen, *next;
675#ifdef IPV6CP_COMP
676 u_short cishort;
677#endif /* IPV6CP_COMP */
678 eui64_t ifaceid;
679 ipv6cp_options no; /* options we've seen Naks for */
680 ipv6cp_options try_; /* options to request next time */
681
682 BZERO(&no, sizeof(no));
683 try_ = *go;
684
685 /*
686 * Any Nak'd CIs must be in exactly the same order that we sent.
687 * Check packet length and CI length at each step.
688 * If we find any deviations, then this packet is bad.
689 */
690#define NAKCIIFACEID(opt, neg, code) \
691 if (go->neg && \
692 len >= (cilen = CILEN_IFACEID) && \
693 p[1] == cilen && \
694 p[0] == opt) { \
695 len -= cilen; \
696 INCPTR(2, p); \
697 eui64_get(ifaceid, p); \
698 no.neg = 1; \
699 code \
700 }
701
702#ifdef IPV6CP_COMP
703#define NAKCIVJ(opt, neg, code) \
704 if (go->neg && \
705 ((cilen = p[1]) == CILEN_COMPRESS) && \
706 len >= cilen && \
707 p[0] == opt) { \
708 len -= cilen; \
709 INCPTR(2, p); \
710 GETSHORT(cishort, p); \
711 no.neg = 1; \
712 code \
713 }
714#endif /* IPV6CP_COMP */
715
716 /*
717 * Accept the peer's idea of {our,his} interface identifier, if different
718 * from our idea, only if the accept_{local,remote} flag is set.
719 */
720 NAKCIIFACEID(CI_IFACEID, neg_ifaceid,
721 if (treat_as_reject) {
722 try_.neg_ifaceid = 0;
723 } else if (go->accept_local) {
724 while (eui64_iszero(ifaceid) ||
725 eui64_equals(ifaceid, go->hisid)) /* bad luck */
726 eui64_magic(ifaceid);
727 try_.ourid = ifaceid;
728 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid)));
729 }
730 );
731
732#ifdef IPV6CP_COMP
733 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
734 {
735 if (cishort == IPV6CP_COMP && !treat_as_reject) {
736 try_.vj_protocol = cishort;
737 } else {
738 try_.neg_vj = 0;
739 }
740 }
741 );
742#endif /* IPV6CP_COMP */
743
744 /*
745 * There may be remaining CIs, if the peer is requesting negotiation
746 * on an option that we didn't include in our request packet.
747 * If they want to negotiate about interface identifier, we comply.
748 * If they want us to ask for compression, we refuse.
749 */
750 while (len >= CILEN_VOID) {
751 GETCHAR(citype, p);
752 GETCHAR(cilen, p);
753 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
754 goto bad;
755 next = p + cilen - 2;
756
757 switch (citype) {
758#ifdef IPV6CP_COMP
759 case CI_COMPRESSTYPE:
760 if (go->neg_vj || no.neg_vj ||
761 (cilen != CILEN_COMPRESS))
762 goto bad;
763 no.neg_vj = 1;
764 break;
765#endif /* IPV6CP_COMP */
766 case CI_IFACEID:
767 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID)
768 goto bad;
769 try_.neg_ifaceid = 1;
770 eui64_get(ifaceid, p);
771 if (go->accept_local) {
772 while (eui64_iszero(ifaceid) ||
773 eui64_equals(ifaceid, go->hisid)) /* bad luck */
774 eui64_magic(ifaceid);
775 try_.ourid = ifaceid;
776 }
777 no.neg_ifaceid = 1;
778 break;
779 default:
780 break;
781 }
782 p = next;
783 }
784
785 /* If there is still anything left, this packet is bad. */
786 if (len != 0)
787 goto bad;
788
789 /*
790 * OK, the Nak is good. Now we can update state.
791 */
792 if (f->state != PPP_FSM_OPENED)
793 *go = try_;
794
795 return 1;
796
797bad:
798 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!"));
799 return 0;
800}
801
802
803/*
804 * ipv6cp_rejci - Reject some of our CIs.
805 */
806static int ipv6cp_rejci(fsm *f, u_char *p, int len) {
807 ppp_pcb *pcb = f->pcb;
808 ipv6cp_options *go = &pcb->ipv6cp_gotoptions;
809 u_char cilen;
810#ifdef IPV6CP_COMP
811 u_short cishort;
812#endif /* IPV6CP_COMP */
813 eui64_t ifaceid;
814 ipv6cp_options try_; /* options to request next time */
815
816 try_ = *go;
817 /*
818 * Any Rejected CIs must be in exactly the same order that we sent.
819 * Check packet length and CI length at each step.
820 * If we find any deviations, then this packet is bad.
821 */
822#define REJCIIFACEID(opt, neg, val1) \
823 if (go->neg && \
824 len >= (cilen = CILEN_IFACEID) && \
825 p[1] == cilen && \
826 p[0] == opt) { \
827 len -= cilen; \
828 INCPTR(2, p); \
829 eui64_get(ifaceid, p); \
830 /* Check rejected value. */ \
831 if (! eui64_equals(ifaceid, val1)) \
832 goto bad; \
833 try_.neg = 0; \
834 }
835
836#ifdef IPV6CP_COMP
837#define REJCIVJ(opt, neg, val) \
838 if (go->neg && \
839 p[1] == CILEN_COMPRESS && \
840 len >= p[1] && \
841 p[0] == opt) { \
842 len -= p[1]; \
843 INCPTR(2, p); \
844 GETSHORT(cishort, p); \
845 /* Check rejected value. */ \
846 if (cishort != val) \
847 goto bad; \
848 try_.neg = 0; \
849 }
850#endif /* IPV6CP_COMP */
851
852 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid);
853
854#ifdef IPV6CP_COMP
855 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol);
856#endif /* IPV6CP_COMP */
857
858 /*
859 * If there are any remaining CIs, then this packet is bad.
860 */
861 if (len != 0)
862 goto bad;
863 /*
864 * Now we can update state.
865 */
866 if (f->state != PPP_FSM_OPENED)
867 *go = try_;
868 return 1;
869
870bad:
871 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!"));
872 return 0;
873}
874
875
876/*
877 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response.
878 *
879 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
880 * appropriately. If reject_if_disagree is non-zero, doesn't return
881 * CONFNAK; returns CONFREJ if it can't return CONFACK.
882 *
883 * inp = Requested CIs
884 * len = Length of requested CIs
885 *
886 */
887static int ipv6cp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree) {
888 ppp_pcb *pcb = f->pcb;
889 ipv6cp_options *wo = &pcb->ipv6cp_wantoptions;
890 ipv6cp_options *ho = &pcb->ipv6cp_hisoptions;
891 ipv6cp_options *ao = &pcb->ipv6cp_allowoptions;
892 ipv6cp_options *go = &pcb->ipv6cp_gotoptions;
893 u_char *cip, *next; /* Pointer to current and next CIs */
894 u_short cilen, citype; /* Parsed len, type */
895#ifdef IPV6CP_COMP
896 u_short cishort; /* Parsed short value */
897#endif /* IPV6CP_COMP */
898 eui64_t ifaceid; /* Parsed interface identifier */
899 int rc = CONFACK; /* Final packet return code */
900 int orc; /* Individual option return code */
901 u_char *p; /* Pointer to next char to parse */
902 u_char *ucp = inp; /* Pointer to current output char */
903 int l = *len; /* Length left */
904
905 /*
906 * Reset all his options.
907 */
908 BZERO(ho, sizeof(*ho));
909
910 /*
911 * Process all his options.
912 */
913 next = inp;
914 while (l) {
915 orc = CONFACK; /* Assume success */
916 cip = p = next; /* Remember begining of CI */
917 if (l < 2 || /* Not enough data for CI header or */
918 p[1] < 2 || /* CI length too small or */
919 p[1] > l) { /* CI length too big? */
920 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!"));
921 orc = CONFREJ; /* Reject bad CI */
922 cilen = l; /* Reject till end of packet */
923 l = 0; /* Don't loop again */
924 goto endswitch;
925 }
926 GETCHAR(citype, p); /* Parse CI type */
927 GETCHAR(cilen, p); /* Parse CI length */
928 l -= cilen; /* Adjust remaining length */
929 next += cilen; /* Step to next CI */
930
931 switch (citype) { /* Check CI type */
932 case CI_IFACEID:
933 IPV6CPDEBUG(("ipv6cp: received interface identifier "));
934
935 if (!ao->neg_ifaceid ||
936 cilen != CILEN_IFACEID) { /* Check CI length */
937 orc = CONFREJ; /* Reject CI */
938 break;
939 }
940
941 /*
942 * If he has no interface identifier, or if we both have same
943 * identifier then NAK it with new idea.
944 * In particular, if we don't know his identifier, but he does,
945 * then accept it.
946 */
947 eui64_get(ifaceid, p);
948 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid)));
949 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) {
950 orc = CONFREJ; /* Reject CI */
951 break;
952 }
953 if (!eui64_iszero(wo->hisid) &&
954 !eui64_equals(ifaceid, wo->hisid) &&
955 eui64_iszero(go->hisid)) {
956
957 orc = CONFNAK;
958 ifaceid = wo->hisid;
959 go->hisid = ifaceid;
960 DECPTR(sizeof(ifaceid), p);
961 eui64_put(ifaceid, p);
962 } else
963 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) {
964 orc = CONFNAK;
965 if (eui64_iszero(go->hisid)) /* first time, try option */
966 ifaceid = wo->hisid;
967 while (eui64_iszero(ifaceid) ||
968 eui64_equals(ifaceid, go->ourid)) /* bad luck */
969 eui64_magic(ifaceid);
970 go->hisid = ifaceid;
971 DECPTR(sizeof(ifaceid), p);
972 eui64_put(ifaceid, p);
973 }
974
975 ho->neg_ifaceid = 1;
976 ho->hisid = ifaceid;
977 break;
978
979#ifdef IPV6CP_COMP
980 case CI_COMPRESSTYPE:
981 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE "));
982 if (!ao->neg_vj ||
983 (cilen != CILEN_COMPRESS)) {
984 orc = CONFREJ;
985 break;
986 }
987 GETSHORT(cishort, p);
988 IPV6CPDEBUG(("(%d)", cishort));
989
990 if (!(cishort == IPV6CP_COMP)) {
991 orc = CONFREJ;
992 break;
993 }
994
995 ho->neg_vj = 1;
996 ho->vj_protocol = cishort;
997 break;
998#endif /* IPV6CP_COMP */
999
1000 default:
1001 orc = CONFREJ;
1002 break;
1003 }
1004
1005endswitch:
1006 IPV6CPDEBUG((" (%s)\n", CODENAME(orc)));
1007
1008 if (orc == CONFACK && /* Good CI */
1009 rc != CONFACK) /* but prior CI wasnt? */
1010 continue; /* Don't send this one */
1011
1012 if (orc == CONFNAK) { /* Nak this CI? */
1013 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1014 orc = CONFREJ; /* Get tough if so */
1015 else {
1016 if (rc == CONFREJ) /* Rejecting prior CI? */
1017 continue; /* Don't send this one */
1018 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1019 rc = CONFNAK; /* Not anymore... */
1020 ucp = inp; /* Backup */
1021 }
1022 }
1023 }
1024
1025 if (orc == CONFREJ && /* Reject this CI */
1026 rc != CONFREJ) { /* but no prior ones? */
1027 rc = CONFREJ;
1028 ucp = inp; /* Backup */
1029 }
1030
1031 /* Need to move CI? */
1032 if (ucp != cip)
1033 MEMCPY(ucp, cip, cilen); /* Move it */
1034
1035 /* Update output pointer */
1036 INCPTR(cilen, ucp);
1037 }
1038
1039 /*
1040 * If we aren't rejecting this packet, and we want to negotiate
1041 * their identifier and they didn't send their identifier, then we
1042 * send a NAK with a CI_IFACEID option appended. We assume the
1043 * input buffer is long enough that we can append the extra
1044 * option safely.
1045 */
1046 if (rc != CONFREJ && !ho->neg_ifaceid &&
1047 wo->req_ifaceid && !reject_if_disagree) {
1048 if (rc == CONFACK) {
1049 rc = CONFNAK;
1050 ucp = inp; /* reset pointer */
1051 wo->req_ifaceid = 0; /* don't ask again */
1052 }
1053 PUTCHAR(CI_IFACEID, ucp);
1054 PUTCHAR(CILEN_IFACEID, ucp);
1055 eui64_put(wo->hisid, ucp);
1056 }
1057
1058 *len = ucp - inp; /* Compute output length */
1059 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc)));
1060 return (rc); /* Return final code */
1061}
1062
1063#if PPP_OPTIONS
1064/*
1065 * ipv6_check_options - check that any IP-related options are OK,
1066 * and assign appropriate defaults.
1067 */
1068static void ipv6_check_options() {
1069 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
1070
1071 if (!ipv6cp_protent.enabled_flag)
1072 return;
1073
1074 /*
1075 * Persistent link-local id is only used when user has not explicitly
1076 * configure/hard-code the id
1077 */
1078 if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) {
1079
1080 /*
1081 * On systems where there are no Ethernet interfaces used, there
1082 * may be other ways to obtain a persistent id. Right now, it
1083 * will fall back to using magic [see eui64_magic] below when
1084 * an EUI-48 from MAC address can't be obtained. Other possibilities
1085 * include obtaining EEPROM serial numbers, or some other unique
1086 * yet persistent number. On Sparc platforms, this is possible,
1087 * but too bad there's no standards yet for x86 machines.
1088 */
1089 if (ether_to_eui64(&wo->ourid)) {
1090 wo->opt_local = 1;
1091 }
1092 }
1093
1094 if (!wo->opt_local) { /* init interface identifier */
1095 if (wo->use_ip && eui64_iszero(wo->ourid)) {
1096 eui64_setlo32(wo->ourid, lwip_ntohl(ipcp_wantoptions[0].ouraddr));
1097 if (!eui64_iszero(wo->ourid))
1098 wo->opt_local = 1;
1099 }
1100
1101 while (eui64_iszero(wo->ourid))
1102 eui64_magic(wo->ourid);
1103 }
1104
1105 if (!wo->opt_remote) {
1106 if (wo->use_ip && eui64_iszero(wo->hisid)) {
1107 eui64_setlo32(wo->hisid, lwip_ntohl(ipcp_wantoptions[0].hisaddr));
1108 if (!eui64_iszero(wo->hisid))
1109 wo->opt_remote = 1;
1110 }
1111 }
1112
1113 if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) {
1114 option_error("local/remote LL address required for demand-dialling\n");
1115 exit(1);
1116 }
1117}
1118#endif /* PPP_OPTIONS */
1119
1120#if DEMAND_SUPPORT
1121/*
1122 * ipv6_demand_conf - configure the interface as though
1123 * IPV6CP were up, for use with dial-on-demand.
1124 */
1125static int ipv6_demand_conf(int u) {
1126 ipv6cp_options *wo = &ipv6cp_wantoptions[u];
1127
1128 if (!sif6up(u))
1129 return 0;
1130
1131 if (!sif6addr(u, wo->ourid, wo->hisid))
1132 return 0;
1133
1134 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE))
1135 return 0;
1136
1137 ppp_notice("ipv6_demand_conf");
1138 ppp_notice("local LL address %s", llv6_ntoa(wo->ourid));
1139 ppp_notice("remote LL address %s", llv6_ntoa(wo->hisid));
1140
1141 return 1;
1142}
1143#endif /* DEMAND_SUPPORT */
1144
1145
1146/*
1147 * ipv6cp_up - IPV6CP has come UP.
1148 *
1149 * Configure the IPv6 network interface appropriately and bring it up.
1150 */
1151static void ipv6cp_up(fsm *f) {
1152 ppp_pcb *pcb = f->pcb;
1153 ipv6cp_options *wo = &pcb->ipv6cp_wantoptions;
1154 ipv6cp_options *ho = &pcb->ipv6cp_hisoptions;
1155 ipv6cp_options *go = &pcb->ipv6cp_gotoptions;
1156
1157 IPV6CPDEBUG(("ipv6cp: up"));
1158
1159 /*
1160 * We must have a non-zero LL address for both ends of the link.
1161 */
1162 if (!ho->neg_ifaceid)
1163 ho->hisid = wo->hisid;
1164
1165#if 0 /* UNUSED */
1166 if(!no_ifaceid_neg) {
1167#endif /* UNUSED */
1168 if (eui64_iszero(ho->hisid)) {
1169 ppp_error("Could not determine remote LL address");
1170 ipv6cp_close(f->pcb, "Could not determine remote LL address");
1171 return;
1172 }
1173 if (eui64_iszero(go->ourid)) {
1174 ppp_error("Could not determine local LL address");
1175 ipv6cp_close(f->pcb, "Could not determine local LL address");
1176 return;
1177 }
1178 if (eui64_equals(go->ourid, ho->hisid)) {
1179 ppp_error("local and remote LL addresses are equal");
1180 ipv6cp_close(f->pcb, "local and remote LL addresses are equal");
1181 return;
1182 }
1183#if 0 /* UNUSED */
1184 }
1185#endif /* UNUSED */
1186#if 0 /* UNUSED */
1187 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0);
1188 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0);
1189#endif /* UNUSED */
1190
1191#ifdef IPV6CP_COMP
1192 /* set tcp compression */
1193 sif6comp(f->unit, ho->neg_vj);
1194#endif
1195
1196#if DEMAND_SUPPORT
1197 /*
1198 * If we are doing dial-on-demand, the interface is already
1199 * configured, so we put out any saved-up packets, then set the
1200 * interface to pass IPv6 packets.
1201 */
1202 if (demand) {
1203 if (! eui64_equals(go->ourid, wo->ourid) ||
1204 ! eui64_equals(ho->hisid, wo->hisid)) {
1205 if (! eui64_equals(go->ourid, wo->ourid))
1206 warn("Local LL address changed to %s",
1207 llv6_ntoa(go->ourid));
1208 if (! eui64_equals(ho->hisid, wo->hisid))
1209 warn("Remote LL address changed to %s",
1210 llv6_ntoa(ho->hisid));
1211 ipv6cp_clear_addrs(f->pcb, go->ourid, ho->hisid);
1212
1213 /* Set the interface to the new addresses */
1214 if (!sif6addr(f->pcb, go->ourid, ho->hisid)) {
1215 if (debug)
1216 warn("sif6addr failed");
1217 ipv6cp_close(f->unit, "Interface configuration failed");
1218 return;
1219 }
1220
1221 }
1222 demand_rexmit(PPP_IPV6);
1223 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1224
1225 } else
1226#endif /* DEMAND_SUPPORT */
1227 {
1228 /*
1229 * Set LL addresses
1230 */
1231 if (!sif6addr(f->pcb, go->ourid, ho->hisid)) {
1232 PPPDEBUG(LOG_DEBUG, ("sif6addr failed"));
1233 ipv6cp_close(f->pcb, "Interface configuration failed");
1234 return;
1235 }
1236
1237 /* bring the interface up for IPv6 */
1238 if (!sif6up(f->pcb)) {
1239 PPPDEBUG(LOG_DEBUG, ("sif6up failed (IPV6)"));
1240 ipv6cp_close(f->pcb, "Interface configuration failed");
1241 return;
1242 }
1243#if DEMAND_SUPPORT
1244 sifnpmode(f->pcb, PPP_IPV6, NPMODE_PASS);
1245#endif /* DEMAND_SUPPORT */
1246
1247 ppp_notice("local LL address %s", llv6_ntoa(go->ourid));
1248 ppp_notice("remote LL address %s", llv6_ntoa(ho->hisid));
1249 }
1250
1251 np_up(f->pcb, PPP_IPV6);
1252 pcb->ipv6cp_is_up = 1;
1253
1254#if 0 /* UNUSED */
1255 /*
1256 * Execute the ipv6-up script, like this:
1257 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL
1258 */
1259 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) {
1260 ipv6cp_script_state = s_up;
1261 ipv6cp_script(_PATH_IPV6UP);
1262 }
1263#endif /* UNUSED */
1264}
1265
1266
1267/*
1268 * ipv6cp_down - IPV6CP has gone DOWN.
1269 *
1270 * Take the IPv6 network interface down, clear its addresses
1271 * and delete routes through it.
1272 */
1273static void ipv6cp_down(fsm *f) {
1274 ppp_pcb *pcb = f->pcb;
1275 ipv6cp_options *go = &pcb->ipv6cp_gotoptions;
1276 ipv6cp_options *ho = &pcb->ipv6cp_hisoptions;
1277
1278 IPV6CPDEBUG(("ipv6cp: down"));
1279#if PPP_STATS_SUPPORT
1280 update_link_stats(f->unit);
1281#endif /* PPP_STATS_SUPPORT */
1282 if (pcb->ipv6cp_is_up) {
1283 pcb->ipv6cp_is_up = 0;
1284 np_down(f->pcb, PPP_IPV6);
1285 }
1286#ifdef IPV6CP_COMP
1287 sif6comp(f->unit, 0);
1288#endif
1289
1290#if DEMAND_SUPPORT
1291 /*
1292 * If we are doing dial-on-demand, set the interface
1293 * to queue up outgoing packets (for now).
1294 */
1295 if (demand) {
1296 sifnpmode(f->pcb, PPP_IPV6, NPMODE_QUEUE);
1297 } else
1298#endif /* DEMAND_SUPPORT */
1299 {
1300#if DEMAND_SUPPORT
1301 sifnpmode(f->pcb, PPP_IPV6, NPMODE_DROP);
1302#endif /* DEMAND_SUPPORT */
1303 ipv6cp_clear_addrs(f->pcb,
1304 go->ourid,
1305 ho->hisid);
1306 sif6down(f->pcb);
1307 }
1308
1309#if 0 /* UNUSED */
1310 /* Execute the ipv6-down script */
1311 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) {
1312 ipv6cp_script_state = s_down;
1313 ipv6cp_script(_PATH_IPV6DOWN);
1314 }
1315#endif /* UNUSED */
1316}
1317
1318
1319/*
1320 * ipv6cp_clear_addrs() - clear the interface addresses, routes,
1321 * proxy neighbour discovery entries, etc.
1322 */
1323static void ipv6cp_clear_addrs(ppp_pcb *pcb, eui64_t ourid, eui64_t hisid) {
1324 cif6addr(pcb, ourid, hisid);
1325}
1326
1327
1328/*
1329 * ipv6cp_finished - possibly shut down the lower layers.
1330 */
1331static void ipv6cp_finished(fsm *f) {
1332 np_finished(f->pcb, PPP_IPV6);
1333}
1334
1335
1336#if 0 /* UNUSED */
1337/*
1338 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script
1339 * has finished.
1340 */
1341static void
1342ipv6cp_script_done(arg)
1343 void *arg;
1344{
1345 ipv6cp_script_pid = 0;
1346 switch (ipv6cp_script_state) {
1347 case s_up:
1348 if (ipv6cp_fsm[0].state != PPP_FSM_OPENED) {
1349 ipv6cp_script_state = s_down;
1350 ipv6cp_script(_PATH_IPV6DOWN);
1351 }
1352 break;
1353 case s_down:
1354 if (ipv6cp_fsm[0].state == PPP_FSM_OPENED) {
1355 ipv6cp_script_state = s_up;
1356 ipv6cp_script(_PATH_IPV6UP);
1357 }
1358 break;
1359 }
1360}
1361
1362
1363/*
1364 * ipv6cp_script - Execute a script with arguments
1365 * interface-name tty-name speed local-LL remote-LL.
1366 */
1367static void
1368ipv6cp_script(script)
1369 char *script;
1370{
1371 char strspeed[32], strlocal[32], strremote[32];
1372 char *argv[8];
1373
1374 sprintf(strspeed, "%d", baud_rate);
1375 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid));
1376 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid));
1377
1378 argv[0] = script;
1379 argv[1] = ifname;
1380 argv[2] = devnam;
1381 argv[3] = strspeed;
1382 argv[4] = strlocal;
1383 argv[5] = strremote;
1384 argv[6] = ipparam;
1385 argv[7] = NULL;
1386
1387 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done,
1388 NULL, 0);
1389}
1390#endif /* UNUSED */
1391
1392#if PRINTPKT_SUPPORT
1393/*
1394 * ipv6cp_printpkt - print the contents of an IPV6CP packet.
1395 */
1396static const char* const ipv6cp_codenames[] = {
1397 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1398 "TermReq", "TermAck", "CodeRej"
1399};
1400
1401static int ipv6cp_printpkt(const u_char *p, int plen,
1402 void (*printer)(void *, const char *, ...), void *arg) {
1403 int code, id, len, olen;
1404 const u_char *pstart, *optend;
1405#ifdef IPV6CP_COMP
1406 u_short cishort;
1407#endif /* IPV6CP_COMP */
1408 eui64_t ifaceid;
1409
1410 if (plen < HEADERLEN)
1411 return 0;
1412 pstart = p;
1413 GETCHAR(code, p);
1414 GETCHAR(id, p);
1415 GETSHORT(len, p);
1416 if (len < HEADERLEN || len > plen)
1417 return 0;
1418
1419 if (code >= 1 && code <= (int)LWIP_ARRAYSIZE(ipv6cp_codenames))
1420 printer(arg, " %s", ipv6cp_codenames[code-1]);
1421 else
1422 printer(arg, " code=0x%x", code);
1423 printer(arg, " id=0x%x", id);
1424 len -= HEADERLEN;
1425 switch (code) {
1426 case CONFREQ:
1427 case CONFACK:
1428 case CONFNAK:
1429 case CONFREJ:
1430 /* print option list */
1431 while (len >= 2) {
1432 GETCHAR(code, p);
1433 GETCHAR(olen, p);
1434 p -= 2;
1435 if (olen < 2 || olen > len) {
1436 break;
1437 }
1438 printer(arg, " <");
1439 len -= olen;
1440 optend = p + olen;
1441 switch (code) {
1442#ifdef IPV6CP_COMP
1443 case CI_COMPRESSTYPE:
1444 if (olen >= CILEN_COMPRESS) {
1445 p += 2;
1446 GETSHORT(cishort, p);
1447 printer(arg, "compress ");
1448 printer(arg, "0x%x", cishort);
1449 }
1450 break;
1451#endif /* IPV6CP_COMP */
1452 case CI_IFACEID:
1453 if (olen == CILEN_IFACEID) {
1454 p += 2;
1455 eui64_get(ifaceid, p);
1456 printer(arg, "addr %s", llv6_ntoa(ifaceid));
1457 }
1458 break;
1459 default:
1460 break;
1461 }
1462 while (p < optend) {
1463 GETCHAR(code, p);
1464 printer(arg, " %.2x", code);
1465 }
1466 printer(arg, ">");
1467 }
1468 break;
1469
1470 case TERMACK:
1471 case TERMREQ:
1472 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1473 printer(arg, " ");
1474 ppp_print_string(p, len, printer, arg);
1475 p += len;
1476 len = 0;
1477 }
1478 break;
1479 default:
1480 break;
1481 }
1482
1483 /* print the rest of the bytes in the packet */
1484 for (; len > 0; --len) {
1485 GETCHAR(code, p);
1486 printer(arg, " %.2x", code);
1487 }
1488
1489 return p - pstart;
1490}
1491#endif /* PRINTPKT_SUPPORT */
1492
1493#if DEMAND_SUPPORT
1494/*
1495 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for.
1496 * We don't bring the link up for IP fragments or for TCP FIN packets
1497 * with no data.
1498 */
1499#define IP6_HDRLEN 40 /* bytes */
1500#define IP6_NHDR_FRAG 44 /* fragment IPv6 header */
1501#define TCP_HDRLEN 20
1502#define TH_FIN 0x01
1503
1504/*
1505 * We use these macros because the IP header may be at an odd address,
1506 * and some compilers might use word loads to get th_off or ip_hl.
1507 */
1508
1509#define get_ip6nh(x) (((unsigned char *)(x))[6])
1510#define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1511#define get_tcpflags(x) (((unsigned char *)(x))[13])
1512
1513static int ipv6_active_pkt(u_char *pkt, int len) {
1514 u_char *tcp;
1515
1516 len -= PPP_HDRLEN;
1517 pkt += PPP_HDRLEN;
1518 if (len < IP6_HDRLEN)
1519 return 0;
1520 if (get_ip6nh(pkt) == IP6_NHDR_FRAG)
1521 return 0;
1522 if (get_ip6nh(pkt) != IPPROTO_TCP)
1523 return 1;
1524 if (len < IP6_HDRLEN + TCP_HDRLEN)
1525 return 0;
1526 tcp = pkt + IP6_HDRLEN;
1527 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4)
1528 return 0;
1529 return 1;
1530}
1531#endif /* DEMAND_SUPPORT */
1532
1533#endif /* PPP_SUPPORT && PPP_IPV6_SUPPORT */
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