2 * ipv6cp.c - PPP IPV6 Control Protocol.
4 * Copyright (c) 1999 Tommi Komulainen. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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
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.
22 * 4. Redistributions of any form whatsoever must retain the following
24 * "This product includes software developed by Tommi Komulainen
25 * <Tommi.Komulainen@iki.fi>".
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.
37 /* Original version, based on RFC2023 :
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.
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.
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).
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.
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.
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.
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).
72 This work has been done in the context of GIE DYADE (joint R & D venture
73 between BULL S.A. and INRIA).
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.
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.
98 * ipcp.c - PPP IP Control Protocol.
100 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
102 * Redistribution and use in source and binary forms, with or without
103 * modification, are permitted provided that the following conditions
106 * 1. Redistributions of source code must retain the above copyright
107 * notice, this list of conditions and the following disclaimer.
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
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
121 * Pittsburgh, PA 15213-3890
122 * (412) 268-4387, fax: (412) 268-7395
123 * tech-transfer@andrew.cmu.edu
125 * 4. Redistributions of any form whatsoever must retain the following
127 * "This product includes software developed by Computing Services
128 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
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.
138 * $Id: ipv6cp.c,v 1.21 2005/08/25 23:59:34 paulus Exp $
141 #define RCSID "$Id: ipv6cp.c,v 1.21 2005/08/25 23:59:34 paulus Exp $"
146 * Proxy Neighbour Discovery.
148 * Better defines for selecting the ordering of
149 * interface up / set address. (currently checks for __linux__,
150 * since SVR4 && (SNI || __USLC__) didn't work properly)
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>
169 #include "pathnames.h"
173 ipv6cp_options ipv6cp_wantoptions[NUM_PPP]; /* Options that we want to request */
174 ipv6cp_options ipv6cp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
175 ipv6cp_options ipv6cp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
176 ipv6cp_options ipv6cp_hisoptions[NUM_PPP]; /* Options that we ack'd */
177 int no_ifaceid_neg = 0;
180 static int ipv6cp_is_up;
182 /* Hook for a plugin to know when IPv6 protocol has come up */
183 void (*ipv6_up_hook) __P((void)) = NULL;
185 /* Hook for a plugin to know when IPv6 protocol has come down */
186 void (*ipv6_down_hook) __P((void)) = NULL;
188 /* Notifiers for when IPCPv6 goes up and down */
189 struct notifier *ipv6_up_notifier = NULL;
190 struct notifier *ipv6_down_notifier = NULL;
193 * Callbacks for fsm code. (CI = Configuration Information)
195 static void ipv6cp_resetci __P((fsm *)); /* Reset our CI */
196 static int ipv6cp_cilen __P((fsm *)); /* Return length of our CI */
197 static void ipv6cp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
198 static int ipv6cp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
199 static int ipv6cp_nakci __P((fsm *, u_char *, int, int));/* Peer nak'd our CI */
200 static int ipv6cp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
201 static int ipv6cp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
202 static void ipv6cp_up __P((fsm *)); /* We're UP */
203 static void ipv6cp_down __P((fsm *)); /* We're DOWN */
204 static void ipv6cp_finished __P((fsm *)); /* Don't need lower layer */
206 fsm ipv6cp_fsm[NUM_PPP]; /* IPV6CP fsm structure */
208 static fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */
209 ipv6cp_resetci, /* Reset our Configuration Information */
210 ipv6cp_cilen, /* Length of our Configuration Information */
211 ipv6cp_addci, /* Add our Configuration Information */
212 ipv6cp_ackci, /* ACK our Configuration Information */
213 ipv6cp_nakci, /* NAK our Configuration Information */
214 ipv6cp_rejci, /* Reject our Configuration Information */
215 ipv6cp_reqci, /* Request peer's Configuration Information */
216 ipv6cp_up, /* Called when fsm reaches OPENED state */
217 ipv6cp_down, /* Called when fsm leaves OPENED state */
218 NULL, /* Called when we want the lower layer up */
219 ipv6cp_finished, /* Called when we want the lower layer down */
220 NULL, /* Called when Protocol-Reject received */
221 NULL, /* Retransmission is necessary */
222 NULL, /* Called to handle protocol-specific codes */
223 "IPV6CP" /* String name of protocol */
227 * Command-line options.
229 static int setifaceid __P((char **arg));
230 static void printifaceid __P((option_t *,
231 void (*)(void *, char *, ...), void *));
233 static option_t ipv6cp_option_list[] = {
234 { "ipv6", o_special, (void *)setifaceid,
235 "Set interface identifiers for IPV6",
236 OPT_A2PRINTER, (void *)printifaceid },
238 { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag,
239 "Enable IPv6 and IPv6CP", OPT_PRIO | 1 },
240 { "noipv6", o_bool, &ipv6cp_protent.enabled_flag,
241 "Disable IPv6 and IPv6CP", OPT_PRIOSUB },
242 { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag,
243 "Disable IPv6 and IPv6CP", OPT_PRIOSUB | OPT_ALIAS },
245 { "ipv6cp-accept-local", o_bool, &ipv6cp_allowoptions[0].accept_local,
246 "Accept peer's interface identifier for us", 1 },
248 { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip,
249 "Use (default) IPv4 address as interface identifier", 1 },
251 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent,
252 "Use uniquely-available persistent value for link local address", 1 },
254 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime,
255 "Set timeout for IPv6CP", OPT_PRIO },
256 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits,
257 "Set max #xmits for term-reqs", OPT_PRIO },
258 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits,
259 "Set max #xmits for conf-reqs", OPT_PRIO },
260 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops,
261 "Set max #conf-naks for IPv6CP", OPT_PRIO },
268 * Protocol entry points from main code.
270 static void ipv6cp_init __P((int));
271 static void ipv6cp_open __P((int));
272 static void ipv6cp_close __P((int, char *));
273 static void ipv6cp_lowerup __P((int));
274 static void ipv6cp_lowerdown __P((int));
275 static void ipv6cp_input __P((int, u_char *, int));
276 static void ipv6cp_protrej __P((int));
277 static int ipv6cp_printpkt __P((u_char *, int,
278 void (*) __P((void *, char *, ...)), void *));
279 static void ipv6_check_options __P((void));
280 static int ipv6_demand_conf __P((int));
281 static int ipv6_active_pkt __P((u_char *, int));
283 struct protent ipv6cp_protent = {
303 static void ipv6cp_clear_addrs __P((int, eui64_t, eui64_t));
304 static void ipv6cp_script __P((char *));
305 static void ipv6cp_script_done __P((void *));
308 * Lengths of configuration options.
311 #define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */
312 #define CILEN_IFACEID 10 /* RFC2472, interface identifier */
314 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
315 (x) == CONFNAK ? "NAK" : "REJ")
318 * This state variable is used to ensure that we don't
319 * run an ipcp-up/down script while one is already running.
321 static enum script_state {
324 } ipv6cp_script_state;
325 static pid_t ipv6cp_script_pid;
328 * setifaceid - set the interface identifiers manually
334 char *comma, *arg, c;
335 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
336 struct in6_addr addr;
337 static int prio_local, prio_remote;
339 #define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \
340 (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) )
343 if ((comma = strchr(arg, ',')) == NULL)
344 comma = arg + strlen(arg);
347 * If comma first character, then no local identifier
353 if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) {
354 option_error("Illegal interface identifier (local): %s", arg);
358 if (option_priority >= prio_local) {
359 eui64_copy(addr.s6_addr32[2], wo->ourid);
361 prio_local = option_priority;
367 * If comma last character, the no remote identifier
369 if (*comma != 0 && *++comma != '\0') {
370 if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) {
371 option_error("Illegal interface identifier (remote): %s", comma);
374 if (option_priority >= prio_remote) {
375 eui64_copy(addr.s6_addr32[2], wo->hisid);
377 prio_remote = option_priority;
381 if (override_value("+ipv6", option_priority, option_source))
382 ipv6cp_protent.enabled_flag = 1;
386 char *llv6_ntoa(eui64_t ifaceid);
389 printifaceid(opt, printer, arg)
391 void (*printer) __P((void *, char *, ...));
394 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
397 printer(arg, "%s", llv6_ntoa(wo->ourid));
400 printer(arg, "%s", llv6_ntoa(wo->hisid));
404 * Make a string representation of a network address.
412 sprintf(b, "fe80::%s", eui64_ntoa(ifaceid));
418 * ipv6cp_init - Initialize IPV6CP.
424 fsm *f = &ipv6cp_fsm[unit];
425 ipv6cp_options *wo = &ipv6cp_wantoptions[unit];
426 ipv6cp_options *ao = &ipv6cp_allowoptions[unit];
429 f->protocol = PPP_IPV6CP;
430 f->callbacks = &ipv6cp_callbacks;
431 fsm_init(&ipv6cp_fsm[unit]);
433 memset(wo, 0, sizeof(*wo));
434 memset(ao, 0, sizeof(*ao));
436 wo->accept_local = 1;
443 wo->vj_protocol = IPV6CP_COMP;
450 * ipv6cp_open - IPV6CP is allowed to come up.
456 fsm_open(&ipv6cp_fsm[unit]);
461 * ipv6cp_close - Take IPV6CP down.
464 ipv6cp_close(unit, reason)
468 fsm_close(&ipv6cp_fsm[unit], reason);
473 * ipv6cp_lowerup - The lower layer is up.
479 fsm_lowerup(&ipv6cp_fsm[unit]);
484 * ipv6cp_lowerdown - The lower layer is down.
487 ipv6cp_lowerdown(unit)
490 fsm_lowerdown(&ipv6cp_fsm[unit]);
495 * ipv6cp_input - Input IPV6CP packet.
498 ipv6cp_input(unit, p, len)
503 fsm_input(&ipv6cp_fsm[unit], p, len);
508 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP.
510 * Pretend the lower layer went down, so we shut up.
516 fsm_lowerdown(&ipv6cp_fsm[unit]);
521 * ipv6cp_resetci - Reset our CI.
527 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
528 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
530 wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid;
532 if (!wo->opt_local) {
533 eui64_magic_nz(wo->ourid);
537 eui64_zero(go->hisid); /* last proposed interface identifier */
542 * ipv6cp_cilen - Return length of our CI.
548 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
550 #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0)
551 #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0)
553 return (LENCIIFACEID(go->neg_ifaceid) +
554 LENCIVJ(go->neg_vj));
559 * ipv6cp_addci - Add our desired CIs to a packet.
562 ipv6cp_addci(f, ucp, lenp)
567 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
570 #define ADDCIVJ(opt, neg, val) \
572 int vjlen = CILEN_COMPRESS; \
573 if (len >= vjlen) { \
575 PUTCHAR(vjlen, ucp); \
576 PUTSHORT(val, ucp); \
582 #define ADDCIIFACEID(opt, neg, val1) \
584 int idlen = CILEN_IFACEID; \
585 if (len >= idlen) { \
587 PUTCHAR(idlen, ucp); \
588 eui64_put(val1, ucp); \
594 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
596 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
603 * ipv6cp_ackci - Ack our CIs.
610 ipv6cp_ackci(f, p, len)
615 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
616 u_short cilen, citype, cishort;
620 * CIs must be in exactly the same order that we sent...
621 * Check packet length and CI length at each step.
622 * If we find any deviations, then this packet is bad.
625 #define ACKCIVJ(opt, neg, val) \
627 int vjlen = CILEN_COMPRESS; \
628 if ((len -= vjlen) < 0) \
630 GETCHAR(citype, p); \
632 if (cilen != vjlen || \
635 GETSHORT(cishort, p); \
636 if (cishort != val) \
640 #define ACKCIIFACEID(opt, neg, val1) \
642 int idlen = CILEN_IFACEID; \
643 if ((len -= idlen) < 0) \
645 GETCHAR(citype, p); \
647 if (cilen != idlen || \
650 eui64_get(ifaceid, p); \
651 if (! eui64_equals(val1, ifaceid)) \
655 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
657 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
660 * If there are any remaining CIs, then this packet is bad.
667 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!"));
672 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs.
673 * This should not modify any state if the Nak is bad
674 * or if IPV6CP is in the OPENED state.
681 ipv6cp_nakci(f, p, len, treat_as_reject)
687 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
688 u_char citype, cilen, *next;
691 ipv6cp_options no; /* options we've seen Naks for */
692 ipv6cp_options try; /* options to request next time */
694 BZERO(&no, sizeof(no));
698 * Any Nak'd CIs must be in exactly the same order that we sent.
699 * Check packet length and CI length at each step.
700 * If we find any deviations, then this packet is bad.
702 #define NAKCIIFACEID(opt, neg, code) \
704 len >= (cilen = CILEN_IFACEID) && \
709 eui64_get(ifaceid, p); \
714 #define NAKCIVJ(opt, neg, code) \
716 ((cilen = p[1]) == CILEN_COMPRESS) && \
721 GETSHORT(cishort, p); \
727 * Accept the peer's idea of {our,his} interface identifier, if different
728 * from our idea, only if the accept_{local,remote} flag is set.
730 NAKCIIFACEID(CI_IFACEID, neg_ifaceid,
731 if (treat_as_reject) {
733 } else if (go->accept_local) {
734 while (eui64_iszero(ifaceid) ||
735 eui64_equals(ifaceid, go->hisid)) /* bad luck */
736 eui64_magic(ifaceid);
738 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid)));
743 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
745 if (cishort == IPV6CP_COMP && !treat_as_reject) {
746 try.vj_protocol = cishort;
753 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
761 * There may be remaining CIs, if the peer is requesting negotiation
762 * on an option that we didn't include in our request packet.
763 * If they want to negotiate about interface identifier, we comply.
764 * If they want us to ask for compression, we refuse.
766 while (len >= CILEN_VOID) {
769 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
771 next = p + cilen - 2;
774 case CI_COMPRESSTYPE:
775 if (go->neg_vj || no.neg_vj ||
776 (cilen != CILEN_COMPRESS))
781 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID)
784 eui64_get(ifaceid, p);
785 if (go->accept_local) {
786 while (eui64_iszero(ifaceid) ||
787 eui64_equals(ifaceid, go->hisid)) /* bad luck */
788 eui64_magic(ifaceid);
797 /* If there is still anything left, this packet is bad. */
802 * OK, the Nak is good. Now we can update state.
804 if (f->state != OPENED)
810 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!"));
816 * ipv6cp_rejci - Reject some of our CIs.
819 ipv6cp_rejci(f, p, len)
824 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
828 ipv6cp_options try; /* options to request next time */
832 * Any Rejected CIs must be in exactly the same order that we sent.
833 * Check packet length and CI length at each step.
834 * If we find any deviations, then this packet is bad.
836 #define REJCIIFACEID(opt, neg, val1) \
838 len >= (cilen = CILEN_IFACEID) && \
843 eui64_get(ifaceid, p); \
844 /* Check rejected value. */ \
845 if (! eui64_equals(ifaceid, val1)) \
850 #define REJCIVJ(opt, neg, val) \
852 p[1] == CILEN_COMPRESS && \
857 GETSHORT(cishort, p); \
858 /* Check rejected value. */ \
859 if (cishort != val) \
864 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid);
866 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol);
869 * If there are any remaining CIs, then this packet is bad.
874 * Now we can update state.
876 if (f->state != OPENED)
881 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!"));
887 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response.
889 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
890 * appropriately. If reject_if_disagree is non-zero, doesn't return
891 * CONFNAK; returns CONFREJ if it can't return CONFACK.
894 ipv6cp_reqci(f, inp, len, reject_if_disagree)
896 u_char *inp; /* Requested CIs */
897 int *len; /* Length of requested CIs */
898 int reject_if_disagree;
900 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
901 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
902 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit];
903 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
904 u_char *cip, *next; /* Pointer to current and next CIs */
905 u_short cilen, citype; /* Parsed len, type */
906 u_short cishort; /* Parsed short value */
907 eui64_t ifaceid; /* Parsed interface identifier */
908 int rc = CONFACK; /* Final packet return code */
909 int orc; /* Individual option return code */
910 u_char *p; /* Pointer to next char to parse */
911 u_char *ucp = inp; /* Pointer to current output char */
912 int l = *len; /* Length left */
915 * Reset all his options.
917 BZERO(ho, sizeof(*ho));
920 * Process all his options.
924 orc = CONFACK; /* Assume success */
925 cip = p = next; /* Remember begining of CI */
926 if (l < 2 || /* Not enough data for CI header or */
927 p[1] < 2 || /* CI length too small or */
928 p[1] > l) { /* CI length too big? */
929 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!"));
930 orc = CONFREJ; /* Reject bad CI */
931 cilen = l; /* Reject till end of packet */
932 l = 0; /* Don't loop again */
935 GETCHAR(citype, p); /* Parse CI type */
936 GETCHAR(cilen, p); /* Parse CI length */
937 l -= cilen; /* Adjust remaining length */
938 next += cilen; /* Step to next CI */
940 switch (citype) { /* Check CI type */
942 IPV6CPDEBUG(("ipv6cp: received interface identifier "));
944 if (!ao->neg_ifaceid ||
945 cilen != CILEN_IFACEID) { /* Check CI length */
946 orc = CONFREJ; /* Reject CI */
951 * If he has no interface identifier, or if we both have same
952 * identifier then NAK it with new idea.
953 * In particular, if we don't know his identifier, but he does,
956 eui64_get(ifaceid, p);
957 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid)));
958 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) {
959 orc = CONFREJ; /* Reject CI */
962 if (!eui64_iszero(wo->hisid) &&
963 !eui64_equals(ifaceid, wo->hisid) &&
964 eui64_iszero(go->hisid)) {
969 DECPTR(sizeof(ifaceid), p);
970 eui64_put(ifaceid, p);
972 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) {
974 if (eui64_iszero(go->hisid)) /* first time, try option */
976 while (eui64_iszero(ifaceid) ||
977 eui64_equals(ifaceid, go->ourid)) /* bad luck */
978 eui64_magic(ifaceid);
980 DECPTR(sizeof(ifaceid), p);
981 eui64_put(ifaceid, p);
988 case CI_COMPRESSTYPE:
989 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE "));
991 (cilen != CILEN_COMPRESS)) {
995 GETSHORT(cishort, p);
996 IPV6CPDEBUG(("(%d)", cishort));
999 if (!(cishort == IPV6CP_COMP)) {
1005 ho->vj_protocol = cishort;
1018 IPV6CPDEBUG((" (%s)\n", CODENAME(orc)));
1020 if (orc == CONFACK && /* Good CI */
1021 rc != CONFACK) /* but prior CI wasnt? */
1022 continue; /* Don't send this one */
1024 if (orc == CONFNAK) { /* Nak this CI? */
1025 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1026 orc = CONFREJ; /* Get tough if so */
1028 if (rc == CONFREJ) /* Rejecting prior CI? */
1029 continue; /* Don't send this one */
1030 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1031 rc = CONFNAK; /* Not anymore... */
1032 ucp = inp; /* Backup */
1037 if (orc == CONFREJ && /* Reject this CI */
1038 rc != CONFREJ) { /* but no prior ones? */
1040 ucp = inp; /* Backup */
1043 /* Need to move CI? */
1045 BCOPY(cip, ucp, cilen); /* Move it */
1047 /* Update output pointer */
1052 * If we aren't rejecting this packet, and we want to negotiate
1053 * their identifier and they didn't send their identifier, then we
1054 * send a NAK with a CI_IFACEID option appended. We assume the
1055 * input buffer is long enough that we can append the extra
1058 if (rc != CONFREJ && !ho->neg_ifaceid &&
1059 wo->req_ifaceid && !reject_if_disagree) {
1060 if (rc == CONFACK) {
1062 ucp = inp; /* reset pointer */
1063 wo->req_ifaceid = 0; /* don't ask again */
1065 PUTCHAR(CI_IFACEID, ucp);
1066 PUTCHAR(CILEN_IFACEID, ucp);
1067 eui64_put(wo->hisid, ucp);
1070 *len = ucp - inp; /* Compute output length */
1071 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc)));
1072 return (rc); /* Return final code */
1077 * ipv6_check_options - check that any IP-related options are OK,
1078 * and assign appropriate defaults.
1081 ipv6_check_options()
1083 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
1085 if (!ipv6cp_protent.enabled_flag)
1089 * Persistent link-local id is only used when user has not explicitly
1090 * configure/hard-code the id
1092 if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) {
1095 * On systems where there are no Ethernet interfaces used, there
1096 * may be other ways to obtain a persistent id. Right now, it
1097 * will fall back to using magic [see eui64_magic] below when
1098 * an EUI-48 from MAC address can't be obtained. Other possibilities
1099 * include obtaining EEPROM serial numbers, or some other unique
1100 * yet persistent number. On Sparc platforms, this is possible,
1101 * but too bad there's no standards yet for x86 machines.
1103 if (ether_to_eui64(&wo->ourid)) {
1108 if (!wo->opt_local) { /* init interface identifier */
1109 if (wo->use_ip && eui64_iszero(wo->ourid)) {
1110 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr));
1111 if (!eui64_iszero(wo->ourid))
1115 while (eui64_iszero(wo->ourid))
1116 eui64_magic(wo->ourid);
1119 if (!wo->opt_remote) {
1120 if (wo->use_ip && eui64_iszero(wo->hisid)) {
1121 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr));
1122 if (!eui64_iszero(wo->hisid))
1127 if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) {
1128 option_error("local/remote LL address required for demand-dialling\n");
1129 exit(EXIT_OPTION_ERROR);
1135 * ipv6_demand_conf - configure the interface as though
1136 * IPV6CP were up, for use with dial-on-demand.
1142 ipv6cp_options *wo = &ipv6cp_wantoptions[u];
1146 if (!sif6addr(u, wo->ourid, wo->hisid))
1148 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1152 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE))
1155 notice("ipv6_demand_conf");
1156 notice("local LL address %s", llv6_ntoa(wo->ourid));
1157 notice("remote LL address %s", llv6_ntoa(wo->hisid));
1164 * ipv6cp_up - IPV6CP has come UP.
1166 * Configure the IPv6 network interface appropriately and bring it up.
1172 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
1173 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
1174 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
1176 IPV6CPDEBUG(("ipv6cp: up"));
1179 * We must have a non-zero LL address for both ends of the link.
1181 if (!ho->neg_ifaceid)
1182 ho->hisid = wo->hisid;
1184 if(!no_ifaceid_neg) {
1185 if (eui64_iszero(ho->hisid)) {
1186 error("Could not determine remote LL address");
1187 ipv6cp_close(f->unit, "Could not determine remote LL address");
1190 if (eui64_iszero(go->ourid)) {
1191 error("Could not determine local LL address");
1192 ipv6cp_close(f->unit, "Could not determine local LL address");
1195 if (eui64_equals(go->ourid, ho->hisid)) {
1196 error("local and remote LL addresses are equal");
1197 ipv6cp_close(f->unit, "local and remote LL addresses are equal");
1201 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0);
1202 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0);
1205 /* set tcp compression */
1206 sif6comp(f->unit, ho->neg_vj);
1210 * If we are doing dial-on-demand, the interface is already
1211 * configured, so we put out any saved-up packets, then set the
1212 * interface to pass IPv6 packets.
1215 if (! eui64_equals(go->ourid, wo->ourid) ||
1216 ! eui64_equals(ho->hisid, wo->hisid)) {
1217 if (! eui64_equals(go->ourid, wo->ourid))
1218 warn("Local LL address changed to %s",
1219 llv6_ntoa(go->ourid));
1220 if (! eui64_equals(ho->hisid, wo->hisid))
1221 warn("Remote LL address changed to %s",
1222 llv6_ntoa(ho->hisid));
1223 ipv6cp_clear_addrs(f->unit, go->ourid, ho->hisid);
1225 /* Set the interface to the new addresses */
1226 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1228 warn("sif6addr failed");
1229 ipv6cp_close(f->unit, "Interface configuration failed");
1234 demand_rexmit(PPP_IPV6);
1235 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1238 /* bring the interface up for IPv6 */
1239 if (!sif6up(f->unit)) {
1241 warn("sif6up failed (IPV6)");
1242 ipv6cp_close(f->unit, "Interface configuration failed");
1246 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1248 warn("sif6addr failed");
1249 ipv6cp_close(f->unit, "Interface configuration failed");
1252 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1254 notice("local LL address %s", llv6_ntoa(go->ourid));
1255 notice("remote LL address %s", llv6_ntoa(ho->hisid));
1258 np_up(f->unit, PPP_IPV6);
1261 notify(ipv6_up_notifier, 0);
1266 * Execute the ipv6-up script, like this:
1267 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL
1269 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) {
1270 ipv6cp_script_state = s_up;
1271 ipv6cp_script(_PATH_IPV6UP);
1277 * ipv6cp_down - IPV6CP has gone DOWN.
1279 * Take the IPv6 network interface down, clear its addresses
1280 * and delete routes through it.
1286 IPV6CPDEBUG(("ipv6cp: down"));
1287 update_link_stats(f->unit);
1288 notify(ipv6_down_notifier, 0);
1293 np_down(f->unit, PPP_IPV6);
1296 sif6comp(f->unit, 0);
1300 * If we are doing dial-on-demand, set the interface
1301 * to queue up outgoing packets (for now).
1304 sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE);
1306 sifnpmode(f->unit, PPP_IPV6, NPMODE_DROP);
1307 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC)))
1310 ipv6cp_clear_addrs(f->unit,
1311 ipv6cp_gotoptions[f->unit].ourid,
1312 ipv6cp_hisoptions[f->unit].hisid);
1313 #if defined(__linux__)
1315 #elif defined(SVR4) && (defined(SNI) || defined(__USLC))
1320 /* Execute the ipv6-down script */
1321 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) {
1322 ipv6cp_script_state = s_down;
1323 ipv6cp_script(_PATH_IPV6DOWN);
1329 * ipv6cp_clear_addrs() - clear the interface addresses, routes,
1330 * proxy neighbour discovery entries, etc.
1333 ipv6cp_clear_addrs(unit, ourid, hisid)
1338 cif6addr(unit, ourid, hisid);
1343 * ipv6cp_finished - possibly shut down the lower layers.
1349 np_finished(f->unit, PPP_IPV6);
1354 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script
1358 ipv6cp_script_done(arg)
1361 ipv6cp_script_pid = 0;
1362 switch (ipv6cp_script_state) {
1364 if (ipv6cp_fsm[0].state != OPENED) {
1365 ipv6cp_script_state = s_down;
1366 ipv6cp_script(_PATH_IPV6DOWN);
1370 if (ipv6cp_fsm[0].state == OPENED) {
1371 ipv6cp_script_state = s_up;
1372 ipv6cp_script(_PATH_IPV6UP);
1380 * ipv6cp_script - Execute a script with arguments
1381 * interface-name tty-name speed local-LL remote-LL.
1384 ipv6cp_script(script)
1387 char strspeed[32], strlocal[32], strremote[32];
1390 sprintf(strspeed, "%d", baud_rate);
1391 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid));
1392 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid));
1399 argv[5] = strremote;
1403 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done,
1408 * ipv6cp_printpkt - print the contents of an IPV6CP packet.
1410 static char *ipv6cp_codenames[] = {
1411 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1412 "TermReq", "TermAck", "CodeRej"
1416 ipv6cp_printpkt(p, plen, printer, arg)
1419 void (*printer) __P((void *, char *, ...));
1422 int code, id, len, olen;
1423 u_char *pstart, *optend;
1427 if (plen < HEADERLEN)
1433 if (len < HEADERLEN || len > plen)
1436 if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *))
1437 printer(arg, " %s", ipv6cp_codenames[code-1]);
1439 printer(arg, " code=0x%x", code);
1440 printer(arg, " id=0x%x", id);
1447 /* print option list */
1452 if (olen < 2 || olen > len) {
1459 case CI_COMPRESSTYPE:
1460 if (olen >= CILEN_COMPRESS) {
1462 GETSHORT(cishort, p);
1463 printer(arg, "compress ");
1464 printer(arg, "0x%x", cishort);
1468 if (olen == CILEN_IFACEID) {
1470 eui64_get(ifaceid, p);
1471 printer(arg, "addr %s", llv6_ntoa(ifaceid));
1475 while (p < optend) {
1477 printer(arg, " %.2x", code);
1485 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1487 print_string((char *)p, len, printer, arg);
1494 /* print the rest of the bytes in the packet */
1495 for (; len > 0; --len) {
1497 printer(arg, " %.2x", code);
1504 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for.
1505 * We don't bring the link up for IP fragments or for TCP FIN packets
1508 #define IP6_HDRLEN 40 /* bytes */
1509 #define IP6_NHDR_FRAG 44 /* fragment IPv6 header */
1510 #define TCP_HDRLEN 20
1514 * We use these macros because the IP header may be at an odd address,
1515 * and some compilers might use word loads to get th_off or ip_hl.
1518 #define get_ip6nh(x) (((unsigned char *)(x))[6])
1519 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1520 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1523 ipv6_active_pkt(pkt, len)
1531 if (len < IP6_HDRLEN)
1533 if (get_ip6nh(pkt) == IP6_NHDR_FRAG)
1535 if (get_ip6nh(pkt) != IPPROTO_TCP)
1537 if (len < IP6_HDRLEN + TCP_HDRLEN)
1539 tcp = pkt + IP6_HDRLEN;
1540 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4)