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.
142 * Proxy Neighbour Discovery.
144 * Better defines for selecting the ordering of
145 * interface up / set address. (currently checks for __linux__,
146 * since SVR4 && (SNI || __USLC__) didn't work properly)
159 #include <sys/param.h>
160 #include <sys/types.h>
161 #include <sys/socket.h>
162 #include <netinet/in.h>
163 #include <arpa/inet.h>
170 #include "pathnames.h"
174 ipv6cp_options ipv6cp_wantoptions[NUM_PPP]; /* Options that we want to request */
175 ipv6cp_options ipv6cp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
176 ipv6cp_options ipv6cp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
177 ipv6cp_options ipv6cp_hisoptions[NUM_PPP]; /* Options that we ack'd */
178 int no_ifaceid_neg = 0;
181 static int default_route_set[NUM_PPP]; /* Have set up a default route */
182 static int ipv6cp_is_up;
183 static bool ipv6cp_noremote;
185 /* Hook for a plugin to know when IPv6 protocol has come up */
186 void (*ipv6_up_hook)(void) = NULL;
188 /* Hook for a plugin to know when IPv6 protocol has come down */
189 void (*ipv6_down_hook)(void) = NULL;
191 /* Notifiers for when IPCPv6 goes up and down */
192 struct notifier *ipv6_up_notifier = NULL;
193 struct notifier *ipv6_down_notifier = NULL;
196 * Callbacks for fsm code. (CI = Configuration Information)
198 static void ipv6cp_resetci (fsm *); /* Reset our CI */
199 static int ipv6cp_cilen (fsm *); /* Return length of our CI */
200 static void ipv6cp_addci (fsm *, u_char *, int *); /* Add our CI */
201 static int ipv6cp_ackci (fsm *, u_char *, int); /* Peer ack'd our CI */
202 static int ipv6cp_nakci (fsm *, u_char *, int, int);/* Peer nak'd our CI */
203 static int ipv6cp_rejci (fsm *, u_char *, int); /* Peer rej'd our CI */
204 static int ipv6cp_reqci (fsm *, u_char *, int *, int); /* Rcv CI */
205 static void ipv6cp_up (fsm *); /* We're UP */
206 static void ipv6cp_down (fsm *); /* We're DOWN */
207 static void ipv6cp_finished (fsm *); /* Don't need lower layer */
209 fsm ipv6cp_fsm[NUM_PPP]; /* IPV6CP fsm structure */
211 static fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */
212 ipv6cp_resetci, /* Reset our Configuration Information */
213 ipv6cp_cilen, /* Length of our Configuration Information */
214 ipv6cp_addci, /* Add our Configuration Information */
215 ipv6cp_ackci, /* ACK our Configuration Information */
216 ipv6cp_nakci, /* NAK our Configuration Information */
217 ipv6cp_rejci, /* Reject our Configuration Information */
218 ipv6cp_reqci, /* Request peer's Configuration Information */
219 ipv6cp_up, /* Called when fsm reaches OPENED state */
220 ipv6cp_down, /* Called when fsm leaves OPENED state */
221 NULL, /* Called when we want the lower layer up */
222 ipv6cp_finished, /* Called when we want the lower layer down */
223 NULL, /* Called when Protocol-Reject received */
224 NULL, /* Retransmission is necessary */
225 NULL, /* Called to handle protocol-specific codes */
226 "IPV6CP" /* String name of protocol */
230 * Command-line options.
232 static int setifaceid (char **arg);
233 static void printifaceid (option_t *,
234 void (*)(void *, char *, ...), void *);
236 static option_t ipv6cp_option_list[] = {
237 { "ipv6", o_special, (void *)setifaceid,
238 "Set interface identifiers for IPV6",
239 OPT_A2PRINTER, (void *)printifaceid },
241 { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag,
242 "Enable IPv6 and IPv6CP", OPT_PRIO | 1 },
243 { "noipv6", o_bool, &ipv6cp_protent.enabled_flag,
244 "Disable IPv6 and IPv6CP", OPT_PRIOSUB },
245 { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag,
246 "Disable IPv6 and IPv6CP", OPT_PRIOSUB | OPT_ALIAS },
248 { "ipv6cp-accept-local", o_bool, &ipv6cp_wantoptions[0].accept_local,
249 "Accept peer's interface identifier for us", 1 },
250 { "ipv6cp-accept-remote", o_bool, &ipv6cp_wantoptions[0].accept_remote,
251 "Accept peer's interface identifier for itself", 1 },
253 { "defaultroute6", o_bool, &ipv6cp_wantoptions[0].default_route,
254 "Add default IPv6 route", OPT_ENABLE|1, &ipv6cp_allowoptions[0].default_route },
255 { "nodefaultroute6", o_bool, &ipv6cp_allowoptions[0].default_route,
256 "disable defaultroute6 option", OPT_A2CLR,
257 &ipv6cp_wantoptions[0].default_route },
258 { "-defaultroute6", o_bool, &ipv6cp_allowoptions[0].default_route,
259 "disable defaultroute6 option", OPT_ALIAS | OPT_A2CLR,
260 &ipv6cp_wantoptions[0].default_route },
262 { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip,
263 "Use (default) IPv4 addresses for both local and remote interface identifiers", 1 },
264 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent,
265 "Use uniquely-available persistent value for local interface identifier", 1 },
266 { "ipv6cp-use-remotenumber", o_bool, &ipv6cp_wantoptions[0].use_remotenumber,
267 "Use remotenumber value for remote interface identifier", 1 },
270 { "ipv6cp-noremote", o_bool, &ipv6cp_noremote,
271 "Allow peer to have no interface identifier", 1 },
273 { "ipv6cp-nosend", o_bool, &ipv6cp_wantoptions[0].neg_ifaceid,
274 "Don't send local interface identifier to peer", OPT_A2CLR },
276 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime,
277 "Set timeout for IPv6CP", OPT_PRIO },
278 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits,
279 "Set max #xmits for term-reqs", OPT_PRIO },
280 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits,
281 "Set max #xmits for conf-reqs", OPT_PRIO },
282 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops,
283 "Set max #conf-naks for IPv6CP", OPT_PRIO },
290 * Protocol entry points from main code.
292 static void ipv6cp_init (int);
293 static void ipv6cp_open (int);
294 static void ipv6cp_close (int, char *);
295 static void ipv6cp_lowerup (int);
296 static void ipv6cp_lowerdown (int);
297 static void ipv6cp_input (int, u_char *, int);
298 static void ipv6cp_protrej (int);
299 static int ipv6cp_printpkt (u_char *, int,
300 void (*) (void *, char *, ...), void *);
301 static void ipv6_check_options (void);
302 static int ipv6_demand_conf (int);
303 static int ipv6_active_pkt (u_char *, int);
305 struct protent ipv6cp_protent = {
325 static void ipv6cp_clear_addrs (int, eui64_t, eui64_t);
326 static void ipv6cp_script (char *);
327 static void ipv6cp_script_done (void *);
330 * Lengths of configuration options.
333 #define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */
334 #define CILEN_IFACEID 10 /* RFC2472, interface identifier */
336 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
337 (x) == CONFNAK ? "NAK" : "REJ")
340 * This state variable is used to ensure that we don't
341 * run an ipcp-up/down script while one is already running.
343 static enum script_state {
346 } ipv6cp_script_state;
347 static pid_t ipv6cp_script_pid;
350 * setifaceid - set the interface identifiers manually
353 setifaceid(char **argv)
355 char *comma, *arg, c;
356 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
357 struct in6_addr addr;
358 static int prio_local, prio_remote;
360 #define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \
361 (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) )
364 if ((comma = strchr(arg, ',')) == NULL)
365 comma = arg + strlen(arg);
368 * If comma first character, then no local identifier
374 if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) {
375 option_error("Illegal interface identifier (local): %s", arg);
379 if (option_priority >= prio_local) {
380 eui64_copy(addr.s6_addr32[2], wo->ourid);
382 prio_local = option_priority;
388 * If comma last character, the no remote identifier
390 if (*comma != 0 && *++comma != '\0') {
391 if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) {
392 option_error("Illegal interface identifier (remote): %s", comma);
395 if (option_priority >= prio_remote) {
396 eui64_copy(addr.s6_addr32[2], wo->hisid);
398 prio_remote = option_priority;
402 if (override_value("+ipv6", option_priority, option_source))
403 ipv6cp_protent.enabled_flag = 1;
407 char *llv6_ntoa(eui64_t ifaceid);
410 printifaceid(option_t *opt, void (*printer) (void *, char *, ...), void *arg)
412 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
415 printer(arg, "%s", llv6_ntoa(wo->ourid));
418 printer(arg, "%s", llv6_ntoa(wo->hisid));
422 * Make a string representation of a network address.
425 llv6_ntoa(eui64_t ifaceid)
429 sprintf(b, "fe80::%s", eui64_ntoa(ifaceid));
435 * ipv6cp_init - Initialize IPV6CP.
438 ipv6cp_init(int unit)
440 fsm *f = &ipv6cp_fsm[unit];
441 ipv6cp_options *wo = &ipv6cp_wantoptions[unit];
442 ipv6cp_options *ao = &ipv6cp_allowoptions[unit];
445 f->protocol = PPP_IPV6CP;
446 f->callbacks = &ipv6cp_callbacks;
447 fsm_init(&ipv6cp_fsm[unit]);
449 memset(wo, 0, sizeof(*wo));
450 memset(ao, 0, sizeof(*ao));
452 wo->accept_local = 0;
453 wo->accept_remote = 0;
460 wo->vj_protocol = IPV6CP_COMP;
464 * XXX This controls whether the user may use the defaultroute option.
466 ao->default_route = 1;
471 * ipv6cp_open - IPV6CP is allowed to come up.
474 ipv6cp_open(int unit)
476 fsm_open(&ipv6cp_fsm[unit]);
481 * ipv6cp_close - Take IPV6CP down.
484 ipv6cp_close(int unit, char *reason)
486 fsm_close(&ipv6cp_fsm[unit], reason);
491 * ipv6cp_lowerup - The lower layer is up.
494 ipv6cp_lowerup(int unit)
496 fsm_lowerup(&ipv6cp_fsm[unit]);
501 * ipv6cp_lowerdown - The lower layer is down.
504 ipv6cp_lowerdown(int unit)
506 fsm_lowerdown(&ipv6cp_fsm[unit]);
511 * ipv6cp_input - Input IPV6CP packet.
514 ipv6cp_input(int unit, u_char *p, int len)
516 fsm_input(&ipv6cp_fsm[unit], p, len);
521 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP.
523 * Pretend the lower layer went down, so we shut up.
526 ipv6cp_protrej(int unit)
528 fsm_lowerdown(&ipv6cp_fsm[unit]);
533 * ipv6cp_resetci - Reset our CI.
536 ipv6cp_resetci(fsm *f)
538 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
539 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
541 wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid;
543 if (!wo->opt_local) {
544 wo->accept_local = 1;
546 eui64_magic_nz(wo->ourid);
549 wo->accept_remote = 1;
552 eui64_zero(go->hisid); /* last proposed interface identifier */
557 * ipv6cp_cilen - Return length of our CI.
562 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
564 #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0)
565 #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0)
567 return (LENCIIFACEID(go->neg_ifaceid) +
568 LENCIVJ(go->neg_vj));
573 * ipv6cp_addci - Add our desired CIs to a packet.
576 ipv6cp_addci(fsm *f, u_char *ucp, int *lenp)
578 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
581 #define ADDCIVJ(opt, neg, val) \
583 int vjlen = CILEN_COMPRESS; \
584 if (len >= vjlen) { \
586 PUTCHAR(vjlen, ucp); \
587 PUTSHORT(val, ucp); \
593 #define ADDCIIFACEID(opt, neg, val1) \
595 int idlen = CILEN_IFACEID; \
596 if (len >= idlen) { \
598 PUTCHAR(idlen, ucp); \
599 eui64_put(val1, ucp); \
605 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
607 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
614 * ipv6cp_ackci - Ack our CIs.
621 ipv6cp_ackci(fsm *f, u_char *p, int len)
623 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
624 u_short cilen, citype, cishort;
628 * CIs must be in exactly the same order that we sent...
629 * Check packet length and CI length at each step.
630 * If we find any deviations, then this packet is bad.
633 #define ACKCIVJ(opt, neg, val) \
635 int vjlen = CILEN_COMPRESS; \
636 if ((len -= vjlen) < 0) \
638 GETCHAR(citype, p); \
640 if (cilen != vjlen || \
643 GETSHORT(cishort, p); \
644 if (cishort != val) \
648 #define ACKCIIFACEID(opt, neg, val1) \
650 int idlen = CILEN_IFACEID; \
651 if ((len -= idlen) < 0) \
653 GETCHAR(citype, p); \
655 if (cilen != idlen || \
658 eui64_get(ifaceid, p); \
659 if (! eui64_equals(val1, ifaceid)) \
663 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
665 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
668 * If there are any remaining CIs, then this packet is bad.
675 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!"));
680 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs.
681 * This should not modify any state if the Nak is bad
682 * or if IPV6CP is in the OPENED state.
689 ipv6cp_nakci(fsm *f, u_char *p, int len, int treat_as_reject)
691 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
692 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
693 u_char citype, cilen, *next;
696 ipv6cp_options no; /* options we've seen Naks for */
697 ipv6cp_options try; /* options to request next time */
699 BZERO(&no, sizeof(no));
703 * Any Nak'd CIs must be in exactly the same order that we sent.
704 * Check packet length and CI length at each step.
705 * If we find any deviations, then this packet is bad.
707 #define NAKCIIFACEID(opt, neg, code) \
709 len >= (cilen = CILEN_IFACEID) && \
714 eui64_get(ifaceid, p); \
719 #define NAKCIVJ(opt, neg, code) \
721 ((cilen = p[1]) == CILEN_COMPRESS) && \
726 GETSHORT(cishort, p); \
732 * Accept the peer's idea of {our,his} interface identifier, if different
733 * from our idea, only if the accept_{local,remote} flag is set.
735 NAKCIIFACEID(CI_IFACEID, neg_ifaceid,
736 if (treat_as_reject) {
738 } else if (go->accept_local && !eui64_iszero(ifaceid) && !eui64_equals(ifaceid, go->hisid)) {
740 } else if (eui64_iszero(ifaceid) && !go->opt_local && wo->neg_ifaceid) {
741 while (eui64_iszero(ifaceid) ||
742 eui64_equals(ifaceid, go->hisid)) /* bad luck */
743 eui64_magic(ifaceid);
745 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid)));
750 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
752 if (cishort == IPV6CP_COMP && !treat_as_reject) {
753 try.vj_protocol = cishort;
760 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
768 * There may be remaining CIs, if the peer is requesting negotiation
769 * on an option that we didn't include in our request packet.
770 * If they want to negotiate about interface identifier, we comply.
771 * If they want us to ask for compression, we refuse.
773 while (len >= CILEN_VOID) {
776 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
778 next = p + cilen - 2;
781 case CI_COMPRESSTYPE:
782 if (go->neg_vj || no.neg_vj ||
783 (cilen != CILEN_COMPRESS))
788 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID)
791 eui64_get(ifaceid, p);
792 if (go->accept_local && !eui64_iszero(ifaceid) && !eui64_equals(ifaceid, go->hisid)) {
794 } else if (eui64_iszero(ifaceid) && !go->opt_local && wo->neg_ifaceid) {
795 while (eui64_iszero(ifaceid) ||
796 eui64_equals(ifaceid, go->hisid)) /* bad luck */
797 eui64_magic(ifaceid);
808 /* If there is still anything left, this packet is bad. */
813 * OK, the Nak is good. Now we can update state.
815 if (f->state != OPENED)
821 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!"));
827 * ipv6cp_rejci - Reject some of our CIs.
830 ipv6cp_rejci(fsm *f, u_char *p, int len)
832 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
836 ipv6cp_options try; /* options to request next time */
840 * Any Rejected CIs must be in exactly the same order that we sent.
841 * Check packet length and CI length at each step.
842 * If we find any deviations, then this packet is bad.
844 #define REJCIIFACEID(opt, neg, val1) \
846 len >= (cilen = CILEN_IFACEID) && \
851 eui64_get(ifaceid, p); \
852 /* Check rejected value. */ \
853 if (! eui64_equals(ifaceid, val1)) \
858 #define REJCIVJ(opt, neg, val) \
860 p[1] == CILEN_COMPRESS && \
865 GETSHORT(cishort, p); \
866 /* Check rejected value. */ \
867 if (cishort != val) \
872 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid);
874 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol);
877 * If there are any remaining CIs, then this packet is bad.
882 * Now we can update state.
884 if (f->state != OPENED)
889 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!"));
895 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response.
897 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
898 * appropriately. If reject_if_disagree is non-zero, doesn't return
899 * CONFNAK; returns CONFREJ if it can't return CONFACK.
902 ipv6cp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree)
904 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
905 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
906 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit];
907 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
908 u_char *cip, *next; /* Pointer to current and next CIs */
909 u_short cilen, citype; /* Parsed len, type */
910 u_short cishort; /* Parsed short value */
911 eui64_t ifaceid; /* Parsed interface identifier */
912 int rc = CONFACK; /* Final packet return code */
913 int orc; /* Individual option return code */
914 u_char *p; /* Pointer to next char to parse */
915 u_char *ucp = inp; /* Pointer to current output char */
916 int l = *len; /* Length left */
919 * Reset all his options.
921 BZERO(ho, sizeof(*ho));
924 * Process all his options.
928 orc = CONFACK; /* Assume success */
929 cip = p = next; /* Remember begining of CI */
930 if (l < 2 || /* Not enough data for CI header or */
931 p[1] < 2 || /* CI length too small or */
932 p[1] > l) { /* CI length too big? */
933 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!"));
934 orc = CONFREJ; /* Reject bad CI */
935 cilen = l; /* Reject till end of packet */
936 l = 0; /* Don't loop again */
939 GETCHAR(citype, p); /* Parse CI type */
940 GETCHAR(cilen, p); /* Parse CI length */
941 l -= cilen; /* Adjust remaining length */
942 next += cilen; /* Step to next CI */
944 switch (citype) { /* Check CI type */
946 IPV6CPDEBUG(("ipv6cp: received interface identifier "));
948 if (!ao->neg_ifaceid ||
949 cilen != CILEN_IFACEID) { /* Check CI length */
950 orc = CONFREJ; /* Reject CI */
955 * If he has no interface identifier, or if we both have same
956 * identifier then NAK it with new idea.
957 * In particular, if we don't know his identifier, but he does,
960 eui64_get(ifaceid, p);
961 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid)));
962 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) {
963 orc = CONFREJ; /* Reject CI */
966 if (!eui64_iszero(wo->hisid) && !wo->accept_remote &&
967 !eui64_equals(ifaceid, wo->hisid)) {
972 DECPTR(sizeof(ifaceid), p);
973 eui64_put(ifaceid, p);
975 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) {
977 if (eui64_iszero(go->hisid)) /* first time, try option */
979 if (eui64_equals(ifaceid, go->ourid)) /* bad luck */
981 if (eui64_iszero(ifaceid)) {
985 while (eui64_iszero(ifaceid) ||
986 eui64_equals(ifaceid, go->ourid)) /* bad luck */
987 eui64_magic(ifaceid);
991 DECPTR(sizeof(ifaceid), p);
992 eui64_put(ifaceid, p);
999 case CI_COMPRESSTYPE:
1000 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE "));
1002 (cilen != CILEN_COMPRESS)) {
1006 GETSHORT(cishort, p);
1007 IPV6CPDEBUG(("(%d)", cishort));
1010 if (!(cishort == IPV6CP_COMP)) {
1016 ho->vj_protocol = cishort;
1029 IPV6CPDEBUG((" (%s)\n", CODENAME(orc)));
1031 if (orc == CONFACK && /* Good CI */
1032 rc != CONFACK) /* but prior CI wasnt? */
1033 continue; /* Don't send this one */
1035 if (orc == CONFNAK) { /* Nak this CI? */
1036 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1037 orc = CONFREJ; /* Get tough if so */
1039 if (rc == CONFREJ) /* Rejecting prior CI? */
1040 continue; /* Don't send this one */
1041 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1042 rc = CONFNAK; /* Not anymore... */
1043 ucp = inp; /* Backup */
1048 if (orc == CONFREJ && /* Reject this CI */
1049 rc != CONFREJ) { /* but no prior ones? */
1051 ucp = inp; /* Backup */
1054 /* Need to move CI? */
1056 BCOPY(cip, ucp, cilen); /* Move it */
1058 /* Update output pointer */
1063 * If we aren't rejecting this packet, and we want to negotiate
1064 * their identifier and they didn't send their identifier, then we
1065 * send a NAK with a CI_IFACEID option appended. We assume the
1066 * input buffer is long enough that we can append the extra
1069 if (rc != CONFREJ && !ho->neg_ifaceid &&
1070 wo->req_ifaceid && !reject_if_disagree) {
1071 if (rc == CONFACK) {
1073 ucp = inp; /* reset pointer */
1074 wo->req_ifaceid = 0; /* don't ask again */
1076 PUTCHAR(CI_IFACEID, ucp);
1077 PUTCHAR(CILEN_IFACEID, ucp);
1078 eui64_put(wo->hisid, ucp);
1081 *len = ucp - inp; /* Compute output length */
1082 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc)));
1083 return (rc); /* Return final code */
1088 * eui48_to_eui64 - Convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1]
1091 eui48_to_eui64(eui64_t *p_eui64, const u_char addr[6])
1093 p_eui64->e8[0] = addr[0] | 0x02;
1094 p_eui64->e8[1] = addr[1];
1095 p_eui64->e8[2] = addr[2];
1096 p_eui64->e8[3] = 0xFF;
1097 p_eui64->e8[4] = 0xFE;
1098 p_eui64->e8[5] = addr[3];
1099 p_eui64->e8[6] = addr[4];
1100 p_eui64->e8[7] = addr[5];
1105 * ether_to_eui64 - Convert 48-bit Ethernet address into 64-bit EUI
1107 * walks the list of valid ethernet interfaces, starting with devnam
1108 * (for PPPoE it is ethernet interface), and convert the first
1109 * found 48-bit MAC address into EUI 64. caller also assumes that
1110 * the system has a properly configured Ethernet interface for this
1111 * function to return non-zero.
1114 ether_to_eui64(eui64_t *p_eui64)
1118 if (get_if_hwaddr(addr, devnam) < 0 && get_first_ether_hwaddr(addr) < 0) {
1119 error("ipv6cp: no persistent id can be found");
1123 eui48_to_eui64(p_eui64, addr);
1129 * ipv6_check_options - check that any IP-related options are OK,
1130 * and assign appropriate defaults.
1133 ipv6_check_options(void)
1135 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
1137 if (!ipv6cp_protent.enabled_flag)
1141 * Persistent link-local id is only used when user has not explicitly
1142 * configure/hard-code the id
1144 if ((wo->use_persistent) && (!wo->opt_local)) {
1147 * On systems where there are no Ethernet interfaces used, there
1148 * may be other ways to obtain a persistent id. Right now, it
1149 * will fall back to using magic [see eui64_magic] below when
1150 * an EUI-48 from MAC address can't be obtained. Other possibilities
1151 * include obtaining EEPROM serial numbers, or some other unique
1152 * yet persistent number. On Sparc platforms, this is possible,
1153 * but too bad there's no standards yet for x86 machines.
1155 if (ether_to_eui64(&wo->ourid)) {
1160 if (!wo->opt_remote && wo->use_remotenumber && *remote_number) {
1161 /* remote number can be either MAC address, IPv4 address, IPv6 address or telephone number */
1162 struct in_addr addr;
1163 struct in6_addr addr6;
1164 unsigned long long tel;
1165 unsigned char mac[6];
1168 if (sscanf(remote_number, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
1169 &mac[0], &mac[1], &mac[2],
1170 &mac[3], &mac[4], &mac[5]) == 6) {
1171 eui48_to_eui64(&wo->hisid, mac);
1172 } else if (inet_pton(AF_INET, remote_number, &addr) == 1) {
1173 eui64_setlo32(wo->hisid, ntohl(addr.s_addr));
1174 } else if (inet_pton(AF_INET6, remote_number, &addr6) == 1) {
1175 /* use low 64 bits of IPv6 address for interface identifier */
1176 wo->hisid.e8[0] = addr6.s6_addr[8];
1177 wo->hisid.e8[1] = addr6.s6_addr[9];
1178 wo->hisid.e8[2] = addr6.s6_addr[10];
1179 wo->hisid.e8[3] = addr6.s6_addr[11];
1180 wo->hisid.e8[4] = addr6.s6_addr[12];
1181 wo->hisid.e8[5] = addr6.s6_addr[13];
1182 wo->hisid.e8[6] = addr6.s6_addr[14];
1183 wo->hisid.e8[7] = addr6.s6_addr[15];
1185 str = remote_number;
1186 /* telephone number may start with leading '+' sign, so skip it */
1190 tel = strtoull(str, &endptr, 10);
1191 if (!errno && *str && !*endptr && tel) {
1192 wo->hisid.e32[0] = htonl(tel >> 32);
1193 wo->hisid.e32[1] = htonl(tel & 0xFFFFFFFF);
1196 if (!eui64_iszero(wo->hisid))
1200 if (!wo->opt_local) { /* init interface identifier */
1201 if (wo->use_ip && eui64_iszero(wo->ourid)) {
1202 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr));
1203 if (!eui64_iszero(wo->ourid))
1207 while (eui64_iszero(wo->ourid))
1208 eui64_magic(wo->ourid);
1211 if (!wo->opt_remote) {
1212 if (wo->use_ip && eui64_iszero(wo->hisid)) {
1213 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr));
1214 if (!eui64_iszero(wo->hisid))
1222 * ipv6_demand_conf - configure the interface as though
1223 * IPV6CP were up, for use with dial-on-demand.
1226 ipv6_demand_conf(int u)
1228 ipv6cp_options *wo = &ipv6cp_wantoptions[u];
1230 if (eui64_iszero(wo->hisid) && !ipv6cp_noremote) {
1231 /* make up an arbitrary identifier for the peer */
1232 eui64_magic_nz(wo->hisid);
1234 if (eui64_iszero(wo->ourid)) {
1235 /* make up an arbitrary identifier for us */
1236 eui64_magic_nz(wo->ourid);
1241 if (!sif6addr(u, wo->ourid, wo->hisid))
1243 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1247 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE))
1249 if (wo->default_route)
1250 if (sif6defaultroute(u, wo->ourid, wo->hisid))
1251 default_route_set[u] = 1;
1253 notice("local LL address %s", llv6_ntoa(wo->ourid));
1254 if (!eui64_iszero(wo->hisid))
1255 notice("remote LL address %s", llv6_ntoa(wo->hisid));
1262 * ipv6cp_up - IPV6CP has come UP.
1264 * Configure the IPv6 network interface appropriately and bring it up.
1269 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
1270 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
1271 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
1273 IPV6CPDEBUG(("ipv6cp: up"));
1276 * We must have a non-zero LL address for both ends of the link.
1279 if (!eui64_iszero(wo->hisid) && !wo->accept_remote && (!ho->neg_ifaceid || !eui64_equals(ho->hisid, wo->hisid))) {
1280 error("Peer refused to agree to his interface identifier");
1281 ipv6cp_close(f->unit, "Refused his interface identifier");
1284 if (!ho->neg_ifaceid)
1285 ho->hisid = wo->hisid;
1287 if(!no_ifaceid_neg) {
1288 if (eui64_iszero(ho->hisid) && !ipv6cp_noremote) {
1289 error("Could not determine remote LL address");
1290 ipv6cp_close(f->unit, "Could not determine remote LL address");
1293 if (eui64_iszero(go->ourid)) {
1294 error("Could not determine local LL address");
1295 ipv6cp_close(f->unit, "Could not determine local LL address");
1298 if (eui64_equals(go->ourid, ho->hisid)) {
1299 error("local and remote LL addresses are equal");
1300 ipv6cp_close(f->unit, "local and remote LL addresses are equal");
1304 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0);
1305 if (!eui64_iszero(ho->hisid))
1306 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0);
1309 /* set tcp compression */
1310 sif6comp(f->unit, ho->neg_vj);
1314 * If we are doing dial-on-demand, the interface is already
1315 * configured, so we put out any saved-up packets, then set the
1316 * interface to pass IPv6 packets.
1319 if (! eui64_equals(go->ourid, wo->ourid) ||
1320 ! eui64_equals(ho->hisid, wo->hisid)) {
1321 if (! eui64_equals(go->ourid, wo->ourid))
1322 warn("Local LL address changed to %s",
1323 llv6_ntoa(go->ourid));
1324 if (! eui64_equals(ho->hisid, wo->hisid))
1325 warn("Remote LL address changed to %s",
1326 llv6_ntoa(ho->hisid));
1327 ipv6cp_clear_addrs(f->unit, wo->ourid, wo->hisid);
1329 /* Set the interface to the new addresses */
1330 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1332 warn("sif6addr failed");
1333 ipv6cp_close(f->unit, "Interface configuration failed");
1337 /* assign a default route through the interface if required */
1338 if (ipv6cp_wantoptions[f->unit].default_route)
1339 if (sif6defaultroute(f->unit, go->ourid, ho->hisid))
1340 default_route_set[f->unit] = 1;
1342 demand_rexmit(PPP_IPV6);
1343 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1346 /* bring the interface up for IPv6 */
1347 if (!sif6up(f->unit)) {
1349 warn("sif6up failed (IPV6)");
1350 ipv6cp_close(f->unit, "Interface configuration failed");
1354 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1356 warn("sif6addr failed");
1357 ipv6cp_close(f->unit, "Interface configuration failed");
1360 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1362 /* assign a default route through the interface if required */
1363 if (ipv6cp_wantoptions[f->unit].default_route)
1364 if (sif6defaultroute(f->unit, go->ourid, ho->hisid))
1365 default_route_set[f->unit] = 1;
1367 notice("local LL address %s", llv6_ntoa(go->ourid));
1368 if (!eui64_iszero(ho->hisid))
1369 notice("remote LL address %s", llv6_ntoa(ho->hisid));
1372 np_up(f->unit, PPP_IPV6);
1375 notify(ipv6_up_notifier, 0);
1380 * Execute the ipv6-up script, like this:
1381 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL
1383 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) {
1384 ipv6cp_script_state = s_up;
1385 ipv6cp_script(path_ipv6up);
1391 * ipv6cp_down - IPV6CP has gone DOWN.
1393 * Take the IPv6 network interface down, clear its addresses
1394 * and delete routes through it.
1399 IPV6CPDEBUG(("ipv6cp: down"));
1400 update_link_stats(f->unit);
1401 notify(ipv6_down_notifier, 0);
1406 np_down(f->unit, PPP_IPV6);
1409 sif6comp(f->unit, 0);
1413 * If we are doing dial-on-demand, set the interface
1414 * to queue up outgoing packets (for now).
1417 sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE);
1419 sifnpmode(f->unit, PPP_IPV6, NPMODE_DROP);
1420 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC)))
1423 ipv6cp_clear_addrs(f->unit,
1424 ipv6cp_gotoptions[f->unit].ourid,
1425 ipv6cp_hisoptions[f->unit].hisid);
1426 #if defined(__linux__)
1428 #elif defined(SVR4) && (defined(SNI) || defined(__USLC))
1433 /* Execute the ipv6-down script */
1434 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) {
1435 ipv6cp_script_state = s_down;
1436 ipv6cp_script(path_ipv6down);
1442 * ipv6cp_clear_addrs() - clear the interface addresses, routes,
1443 * proxy neighbour discovery entries, etc.
1446 ipv6cp_clear_addrs(int unit, eui64_t ourid, eui64_t hisid)
1448 cif6addr(unit, ourid, hisid);
1453 * ipv6cp_finished - possibly shut down the lower layers.
1456 ipv6cp_finished(fsm *f)
1458 np_finished(f->unit, PPP_IPV6);
1463 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script
1467 ipv6cp_script_done(void *arg)
1469 ipv6cp_script_pid = 0;
1470 switch (ipv6cp_script_state) {
1472 if (ipv6cp_fsm[0].state != OPENED) {
1473 ipv6cp_script_state = s_down;
1474 ipv6cp_script(path_ipv6down);
1478 if (ipv6cp_fsm[0].state == OPENED) {
1479 ipv6cp_script_state = s_up;
1480 ipv6cp_script(path_ipv6up);
1488 * ipv6cp_script - Execute a script with arguments
1489 * interface-name tty-name speed local-LL remote-LL.
1492 ipv6cp_script(char *script)
1494 char strspeed[32], strlocal[32], strremote[32];
1497 sprintf(strspeed, "%d", baud_rate);
1498 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid));
1499 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid));
1506 argv[5] = strremote;
1510 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done,
1515 * ipv6cp_printpkt - print the contents of an IPV6CP packet.
1517 static char *ipv6cp_codenames[] = {
1518 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1519 "TermReq", "TermAck", "CodeRej"
1523 ipv6cp_printpkt(u_char *p, int plen,
1524 void (*printer) (void *, char *, ...), void *arg)
1526 int code, id, len, olen;
1527 u_char *pstart, *optend;
1531 if (plen < HEADERLEN)
1537 if (len < HEADERLEN || len > plen)
1540 if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *))
1541 printer(arg, " %s", ipv6cp_codenames[code-1]);
1543 printer(arg, " code=0x%x", code);
1544 printer(arg, " id=0x%x", id);
1551 /* print option list */
1556 if (olen < 2 || olen > len) {
1563 case CI_COMPRESSTYPE:
1564 if (olen >= CILEN_COMPRESS) {
1566 GETSHORT(cishort, p);
1567 printer(arg, "compress ");
1568 printer(arg, "0x%x", cishort);
1572 if (olen == CILEN_IFACEID) {
1574 eui64_get(ifaceid, p);
1575 printer(arg, "addr %s", llv6_ntoa(ifaceid));
1579 while (p < optend) {
1581 printer(arg, " %.2x", code);
1589 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1591 print_string((char *)p, len, printer, arg);
1598 /* print the rest of the bytes in the packet */
1599 for (; len > 0; --len) {
1601 printer(arg, " %.2x", code);
1608 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for.
1609 * We don't bring the link up for IP fragments or for TCP FIN packets
1612 #define IP6_HDRLEN 40 /* bytes */
1613 #define IP6_NHDR_FRAG 44 /* fragment IPv6 header */
1614 #define TCP_HDRLEN 20
1618 * We use these macros because the IP header may be at an odd address,
1619 * and some compilers might use word loads to get th_off or ip_hl.
1622 #define get_ip6nh(x) (((unsigned char *)(x))[6])
1623 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1624 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1627 ipv6_active_pkt(u_char *pkt, int len)
1633 if (len < IP6_HDRLEN)
1635 if (get_ip6nh(pkt) == IP6_NHDR_FRAG)
1637 if (get_ip6nh(pkt) != IPPROTO_TCP)
1639 if (len < IP6_HDRLEN + TCP_HDRLEN)
1641 tcp = pkt + IP6_HDRLEN;
1642 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4)