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)
154 #include <sys/param.h>
155 #include <sys/types.h>
156 #include <sys/socket.h>
157 #include <netinet/in.h>
158 #include <arpa/inet.h>
165 #include "pathnames.h"
169 ipv6cp_options ipv6cp_wantoptions[NUM_PPP]; /* Options that we want to request */
170 ipv6cp_options ipv6cp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
171 ipv6cp_options ipv6cp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
172 ipv6cp_options ipv6cp_hisoptions[NUM_PPP]; /* Options that we ack'd */
173 int no_ifaceid_neg = 0;
176 static int default_route_set[NUM_PPP]; /* Have set up a default route */
177 static int ipv6cp_is_up;
179 /* Hook for a plugin to know when IPv6 protocol has come up */
180 void (*ipv6_up_hook)(void) = NULL;
182 /* Hook for a plugin to know when IPv6 protocol has come down */
183 void (*ipv6_down_hook)(void) = NULL;
185 /* Notifiers for when IPCPv6 goes up and down */
186 struct notifier *ipv6_up_notifier = NULL;
187 struct notifier *ipv6_down_notifier = NULL;
190 * Callbacks for fsm code. (CI = Configuration Information)
192 static void ipv6cp_resetci (fsm *); /* Reset our CI */
193 static int ipv6cp_cilen (fsm *); /* Return length of our CI */
194 static void ipv6cp_addci (fsm *, u_char *, int *); /* Add our CI */
195 static int ipv6cp_ackci (fsm *, u_char *, int); /* Peer ack'd our CI */
196 static int ipv6cp_nakci (fsm *, u_char *, int, int);/* Peer nak'd our CI */
197 static int ipv6cp_rejci (fsm *, u_char *, int); /* Peer rej'd our CI */
198 static int ipv6cp_reqci (fsm *, u_char *, int *, int); /* Rcv CI */
199 static void ipv6cp_up (fsm *); /* We're UP */
200 static void ipv6cp_down (fsm *); /* We're DOWN */
201 static void ipv6cp_finished (fsm *); /* Don't need lower layer */
203 fsm ipv6cp_fsm[NUM_PPP]; /* IPV6CP fsm structure */
205 static fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */
206 ipv6cp_resetci, /* Reset our Configuration Information */
207 ipv6cp_cilen, /* Length of our Configuration Information */
208 ipv6cp_addci, /* Add our Configuration Information */
209 ipv6cp_ackci, /* ACK our Configuration Information */
210 ipv6cp_nakci, /* NAK our Configuration Information */
211 ipv6cp_rejci, /* Reject our Configuration Information */
212 ipv6cp_reqci, /* Request peer's Configuration Information */
213 ipv6cp_up, /* Called when fsm reaches OPENED state */
214 ipv6cp_down, /* Called when fsm leaves OPENED state */
215 NULL, /* Called when we want the lower layer up */
216 ipv6cp_finished, /* Called when we want the lower layer down */
217 NULL, /* Called when Protocol-Reject received */
218 NULL, /* Retransmission is necessary */
219 NULL, /* Called to handle protocol-specific codes */
220 "IPV6CP" /* String name of protocol */
224 * Command-line options.
226 static int setifaceid (char **arg);
227 static void printifaceid (option_t *,
228 void (*)(void *, char *, ...), void *);
230 static option_t ipv6cp_option_list[] = {
231 { "ipv6", o_special, (void *)setifaceid,
232 "Set interface identifiers for IPV6",
233 OPT_A2PRINTER, (void *)printifaceid },
235 { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag,
236 "Enable IPv6 and IPv6CP", OPT_PRIO | 1 },
237 { "noipv6", o_bool, &ipv6cp_protent.enabled_flag,
238 "Disable IPv6 and IPv6CP", OPT_PRIOSUB },
239 { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag,
240 "Disable IPv6 and IPv6CP", OPT_PRIOSUB | OPT_ALIAS },
242 { "ipv6cp-accept-local", o_bool, &ipv6cp_allowoptions[0].accept_local,
243 "Accept peer's interface identifier for us", 1 },
244 { "ipv6cp-accept-remote", o_bool, &ipv6cp_allowoptions[0].accept_remote,
245 "Accept peer's interface identifier for itself", 1 },
247 { "defaultroute6", o_bool, &ipv6cp_wantoptions[0].default_route,
248 "Add default IPv6 route", OPT_ENABLE|1, &ipv6cp_allowoptions[0].default_route },
249 { "nodefaultroute6", o_bool, &ipv6cp_allowoptions[0].default_route,
250 "disable defaultroute6 option", OPT_A2CLR,
251 &ipv6cp_wantoptions[0].default_route },
252 { "-defaultroute6", o_bool, &ipv6cp_allowoptions[0].default_route,
253 "disable defaultroute6 option", OPT_ALIAS | OPT_A2CLR,
254 &ipv6cp_wantoptions[0].default_route },
256 { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip,
257 "Use (default) IPv4 address as interface identifier", 1 },
259 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent,
260 "Use uniquely-available persistent value for link local address", 1 },
262 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime,
263 "Set timeout for IPv6CP", OPT_PRIO },
264 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits,
265 "Set max #xmits for term-reqs", OPT_PRIO },
266 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits,
267 "Set max #xmits for conf-reqs", OPT_PRIO },
268 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops,
269 "Set max #conf-naks for IPv6CP", OPT_PRIO },
276 * Protocol entry points from main code.
278 static void ipv6cp_init (int);
279 static void ipv6cp_open (int);
280 static void ipv6cp_close (int, char *);
281 static void ipv6cp_lowerup (int);
282 static void ipv6cp_lowerdown (int);
283 static void ipv6cp_input (int, u_char *, int);
284 static void ipv6cp_protrej (int);
285 static int ipv6cp_printpkt (u_char *, int,
286 void (*) (void *, char *, ...), void *);
287 static void ipv6_check_options (void);
288 static int ipv6_demand_conf (int);
289 static int ipv6_active_pkt (u_char *, int);
291 struct protent ipv6cp_protent = {
311 static void ipv6cp_clear_addrs (int, eui64_t, eui64_t);
312 static void ipv6cp_script (char *);
313 static void ipv6cp_script_done (void *);
316 * Lengths of configuration options.
319 #define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */
320 #define CILEN_IFACEID 10 /* RFC2472, interface identifier */
322 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
323 (x) == CONFNAK ? "NAK" : "REJ")
326 * This state variable is used to ensure that we don't
327 * run an ipcp-up/down script while one is already running.
329 static enum script_state {
332 } ipv6cp_script_state;
333 static pid_t ipv6cp_script_pid;
336 * setifaceid - set the interface identifiers manually
339 setifaceid(char **argv)
341 char *comma, *arg, c;
342 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
343 struct in6_addr addr;
344 static int prio_local, prio_remote;
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)) )
350 if ((comma = strchr(arg, ',')) == NULL)
351 comma = arg + strlen(arg);
354 * If comma first character, then no local identifier
360 if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) {
361 option_error("Illegal interface identifier (local): %s", arg);
365 if (option_priority >= prio_local) {
366 eui64_copy(addr.s6_addr32[2], wo->ourid);
368 prio_local = option_priority;
374 * If comma last character, the no remote identifier
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);
381 if (option_priority >= prio_remote) {
382 eui64_copy(addr.s6_addr32[2], wo->hisid);
384 prio_remote = option_priority;
388 if (override_value("+ipv6", option_priority, option_source))
389 ipv6cp_protent.enabled_flag = 1;
393 char *llv6_ntoa(eui64_t ifaceid);
396 printifaceid(option_t *opt, void (*printer) (void *, char *, ...), void *arg)
398 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
401 printer(arg, "%s", llv6_ntoa(wo->ourid));
404 printer(arg, "%s", llv6_ntoa(wo->hisid));
408 * Make a string representation of a network address.
411 llv6_ntoa(eui64_t ifaceid)
415 sprintf(b, "fe80::%s", eui64_ntoa(ifaceid));
421 * ipv6cp_init - Initialize IPV6CP.
424 ipv6cp_init(int unit)
426 fsm *f = &ipv6cp_fsm[unit];
427 ipv6cp_options *wo = &ipv6cp_wantoptions[unit];
428 ipv6cp_options *ao = &ipv6cp_allowoptions[unit];
431 f->protocol = PPP_IPV6CP;
432 f->callbacks = &ipv6cp_callbacks;
433 fsm_init(&ipv6cp_fsm[unit]);
435 memset(wo, 0, sizeof(*wo));
436 memset(ao, 0, sizeof(*ao));
438 wo->accept_local = 0;
439 wo->accept_remote = 0;
446 wo->vj_protocol = IPV6CP_COMP;
450 * XXX This controls whether the user may use the defaultroute option.
452 ao->default_route = 1;
457 * ipv6cp_open - IPV6CP is allowed to come up.
460 ipv6cp_open(int unit)
462 fsm_open(&ipv6cp_fsm[unit]);
467 * ipv6cp_close - Take IPV6CP down.
470 ipv6cp_close(int unit, char *reason)
472 fsm_close(&ipv6cp_fsm[unit], reason);
477 * ipv6cp_lowerup - The lower layer is up.
480 ipv6cp_lowerup(int unit)
482 fsm_lowerup(&ipv6cp_fsm[unit]);
487 * ipv6cp_lowerdown - The lower layer is down.
490 ipv6cp_lowerdown(int unit)
492 fsm_lowerdown(&ipv6cp_fsm[unit]);
497 * ipv6cp_input - Input IPV6CP packet.
500 ipv6cp_input(int unit, u_char *p, int len)
502 fsm_input(&ipv6cp_fsm[unit], p, len);
507 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP.
509 * Pretend the lower layer went down, so we shut up.
512 ipv6cp_protrej(int unit)
514 fsm_lowerdown(&ipv6cp_fsm[unit]);
519 * ipv6cp_resetci - Reset our CI.
522 ipv6cp_resetci(fsm *f)
524 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
525 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
527 wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid;
529 if (!wo->opt_local) {
530 wo->accept_local = 1;
531 eui64_magic_nz(wo->ourid);
534 wo->accept_remote = 1;
537 eui64_zero(go->hisid); /* last proposed interface identifier */
542 * ipv6cp_cilen - Return length of our CI.
547 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
549 #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0)
550 #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0)
552 return (LENCIIFACEID(go->neg_ifaceid) +
553 LENCIVJ(go->neg_vj));
558 * ipv6cp_addci - Add our desired CIs to a packet.
561 ipv6cp_addci(fsm *f, u_char *ucp, int *lenp)
563 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
566 #define ADDCIVJ(opt, neg, val) \
568 int vjlen = CILEN_COMPRESS; \
569 if (len >= vjlen) { \
571 PUTCHAR(vjlen, ucp); \
572 PUTSHORT(val, ucp); \
578 #define ADDCIIFACEID(opt, neg, val1) \
580 int idlen = CILEN_IFACEID; \
581 if (len >= idlen) { \
583 PUTCHAR(idlen, ucp); \
584 eui64_put(val1, ucp); \
590 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
592 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
599 * ipv6cp_ackci - Ack our CIs.
606 ipv6cp_ackci(fsm *f, u_char *p, int len)
608 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
609 u_short cilen, citype, cishort;
613 * CIs must be in exactly the same order that we sent...
614 * Check packet length and CI length at each step.
615 * If we find any deviations, then this packet is bad.
618 #define ACKCIVJ(opt, neg, val) \
620 int vjlen = CILEN_COMPRESS; \
621 if ((len -= vjlen) < 0) \
623 GETCHAR(citype, p); \
625 if (cilen != vjlen || \
628 GETSHORT(cishort, p); \
629 if (cishort != val) \
633 #define ACKCIIFACEID(opt, neg, val1) \
635 int idlen = CILEN_IFACEID; \
636 if ((len -= idlen) < 0) \
638 GETCHAR(citype, p); \
640 if (cilen != idlen || \
643 eui64_get(ifaceid, p); \
644 if (! eui64_equals(val1, ifaceid)) \
648 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
650 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
653 * If there are any remaining CIs, then this packet is bad.
660 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!"));
665 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs.
666 * This should not modify any state if the Nak is bad
667 * or if IPV6CP is in the OPENED state.
674 ipv6cp_nakci(fsm *f, u_char *p, int len, int treat_as_reject)
676 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
677 u_char citype, cilen, *next;
680 ipv6cp_options no; /* options we've seen Naks for */
681 ipv6cp_options try; /* options to request next time */
683 BZERO(&no, sizeof(no));
687 * Any Nak'd CIs must be in exactly the same order that we sent.
688 * Check packet length and CI length at each step.
689 * If we find any deviations, then this packet is bad.
691 #define NAKCIIFACEID(opt, neg, code) \
693 len >= (cilen = CILEN_IFACEID) && \
698 eui64_get(ifaceid, p); \
703 #define NAKCIVJ(opt, neg, code) \
705 ((cilen = p[1]) == CILEN_COMPRESS) && \
710 GETSHORT(cishort, p); \
716 * Accept the peer's idea of {our,his} interface identifier, if different
717 * from our idea, only if the accept_{local,remote} flag is set.
719 NAKCIIFACEID(CI_IFACEID, neg_ifaceid,
720 if (treat_as_reject) {
722 } else if (go->accept_local) {
723 while (eui64_iszero(ifaceid) ||
724 eui64_equals(ifaceid, go->hisid)) /* bad luck */
725 eui64_magic(ifaceid);
727 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid)));
732 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
734 if (cishort == IPV6CP_COMP && !treat_as_reject) {
735 try.vj_protocol = cishort;
742 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
750 * There may be remaining CIs, if the peer is requesting negotiation
751 * on an option that we didn't include in our request packet.
752 * If they want to negotiate about interface identifier, we comply.
753 * If they want us to ask for compression, we refuse.
755 while (len >= CILEN_VOID) {
758 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
760 next = p + cilen - 2;
763 case CI_COMPRESSTYPE:
764 if (go->neg_vj || no.neg_vj ||
765 (cilen != CILEN_COMPRESS))
770 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID)
773 eui64_get(ifaceid, p);
774 if (go->accept_local) {
775 while (eui64_iszero(ifaceid) ||
776 eui64_equals(ifaceid, go->hisid)) /* bad luck */
777 eui64_magic(ifaceid);
786 /* If there is still anything left, this packet is bad. */
791 * OK, the Nak is good. Now we can update state.
793 if (f->state != OPENED)
799 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!"));
805 * ipv6cp_rejci - Reject some of our CIs.
808 ipv6cp_rejci(fsm *f, u_char *p, int len)
810 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
814 ipv6cp_options try; /* options to request next time */
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.
822 #define REJCIIFACEID(opt, neg, val1) \
824 len >= (cilen = CILEN_IFACEID) && \
829 eui64_get(ifaceid, p); \
830 /* Check rejected value. */ \
831 if (! eui64_equals(ifaceid, val1)) \
836 #define REJCIVJ(opt, neg, val) \
838 p[1] == CILEN_COMPRESS && \
843 GETSHORT(cishort, p); \
844 /* Check rejected value. */ \
845 if (cishort != val) \
850 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid);
852 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol);
855 * If there are any remaining CIs, then this packet is bad.
860 * Now we can update state.
862 if (f->state != OPENED)
867 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!"));
873 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response.
875 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
876 * appropriately. If reject_if_disagree is non-zero, doesn't return
877 * CONFNAK; returns CONFREJ if it can't return CONFACK.
880 ipv6cp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree)
882 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
883 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
884 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit];
885 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
886 u_char *cip, *next; /* Pointer to current and next CIs */
887 u_short cilen, citype; /* Parsed len, type */
888 u_short cishort; /* Parsed short value */
889 eui64_t ifaceid; /* Parsed interface identifier */
890 int rc = CONFACK; /* Final packet return code */
891 int orc; /* Individual option return code */
892 u_char *p; /* Pointer to next char to parse */
893 u_char *ucp = inp; /* Pointer to current output char */
894 int l = *len; /* Length left */
897 * Reset all his options.
899 BZERO(ho, sizeof(*ho));
902 * Process all his options.
906 orc = CONFACK; /* Assume success */
907 cip = p = next; /* Remember begining of CI */
908 if (l < 2 || /* Not enough data for CI header or */
909 p[1] < 2 || /* CI length too small or */
910 p[1] > l) { /* CI length too big? */
911 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!"));
912 orc = CONFREJ; /* Reject bad CI */
913 cilen = l; /* Reject till end of packet */
914 l = 0; /* Don't loop again */
917 GETCHAR(citype, p); /* Parse CI type */
918 GETCHAR(cilen, p); /* Parse CI length */
919 l -= cilen; /* Adjust remaining length */
920 next += cilen; /* Step to next CI */
922 switch (citype) { /* Check CI type */
924 IPV6CPDEBUG(("ipv6cp: received interface identifier "));
926 if (!ao->neg_ifaceid ||
927 cilen != CILEN_IFACEID) { /* Check CI length */
928 orc = CONFREJ; /* Reject CI */
933 * If he has no interface identifier, or if we both have same
934 * identifier then NAK it with new idea.
935 * In particular, if we don't know his identifier, but he does,
938 eui64_get(ifaceid, p);
939 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid)));
940 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) {
941 orc = CONFREJ; /* Reject CI */
944 if (!eui64_iszero(wo->hisid) && !wo->accept_remote &&
945 !eui64_equals(ifaceid, wo->hisid) &&
946 eui64_iszero(go->hisid)) {
951 DECPTR(sizeof(ifaceid), p);
952 eui64_put(ifaceid, p);
954 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) {
956 if (eui64_iszero(go->hisid)) /* first time, try option */
958 while (eui64_iszero(ifaceid) ||
959 eui64_equals(ifaceid, go->ourid)) /* bad luck */
960 eui64_magic(ifaceid);
962 DECPTR(sizeof(ifaceid), p);
963 eui64_put(ifaceid, p);
970 case CI_COMPRESSTYPE:
971 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE "));
973 (cilen != CILEN_COMPRESS)) {
977 GETSHORT(cishort, p);
978 IPV6CPDEBUG(("(%d)", cishort));
981 if (!(cishort == IPV6CP_COMP)) {
987 ho->vj_protocol = cishort;
1000 IPV6CPDEBUG((" (%s)\n", CODENAME(orc)));
1002 if (orc == CONFACK && /* Good CI */
1003 rc != CONFACK) /* but prior CI wasnt? */
1004 continue; /* Don't send this one */
1006 if (orc == CONFNAK) { /* Nak this CI? */
1007 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1008 orc = CONFREJ; /* Get tough if so */
1010 if (rc == CONFREJ) /* Rejecting prior CI? */
1011 continue; /* Don't send this one */
1012 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1013 rc = CONFNAK; /* Not anymore... */
1014 ucp = inp; /* Backup */
1019 if (orc == CONFREJ && /* Reject this CI */
1020 rc != CONFREJ) { /* but no prior ones? */
1022 ucp = inp; /* Backup */
1025 /* Need to move CI? */
1027 BCOPY(cip, ucp, cilen); /* Move it */
1029 /* Update output pointer */
1034 * If we aren't rejecting this packet, and we want to negotiate
1035 * their identifier and they didn't send their identifier, then we
1036 * send a NAK with a CI_IFACEID option appended. We assume the
1037 * input buffer is long enough that we can append the extra
1040 if (rc != CONFREJ && !ho->neg_ifaceid &&
1041 wo->req_ifaceid && !reject_if_disagree) {
1042 if (rc == CONFACK) {
1044 ucp = inp; /* reset pointer */
1045 wo->req_ifaceid = 0; /* don't ask again */
1047 PUTCHAR(CI_IFACEID, ucp);
1048 PUTCHAR(CILEN_IFACEID, ucp);
1049 eui64_put(wo->hisid, ucp);
1052 *len = ucp - inp; /* Compute output length */
1053 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc)));
1054 return (rc); /* Return final code */
1059 * ether_to_eui64 - Convert 48-bit Ethernet address into 64-bit EUI
1061 * walks the list of valid ethernet interfaces, starting with devnam
1062 * (for PPPoE it is ethernet interface), and convert the first
1063 * found 48-bit MAC address into EUI 64. caller also assumes that
1064 * the system has a properly configured Ethernet interface for this
1065 * function to return non-zero.
1068 ether_to_eui64(eui64_t *p_eui64)
1072 if (get_if_hwaddr(addr, devnam) < 0 || get_first_ether_hwaddr(addr) < 0) {
1073 error("ipv6cp: no persistent id can be found");
1078 * And convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1]
1080 p_eui64->e8[0] = addr[0] | 0x02;
1081 p_eui64->e8[1] = addr[1];
1082 p_eui64->e8[2] = addr[2];
1083 p_eui64->e8[3] = 0xFF;
1084 p_eui64->e8[4] = 0xFE;
1085 p_eui64->e8[5] = addr[3];
1086 p_eui64->e8[6] = addr[4];
1087 p_eui64->e8[7] = addr[5];
1094 * ipv6_check_options - check that any IP-related options are OK,
1095 * and assign appropriate defaults.
1098 ipv6_check_options(void)
1100 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
1102 if (!ipv6cp_protent.enabled_flag)
1106 * Persistent link-local id is only used when user has not explicitly
1107 * configure/hard-code the id
1109 if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) {
1112 * On systems where there are no Ethernet interfaces used, there
1113 * may be other ways to obtain a persistent id. Right now, it
1114 * will fall back to using magic [see eui64_magic] below when
1115 * an EUI-48 from MAC address can't be obtained. Other possibilities
1116 * include obtaining EEPROM serial numbers, or some other unique
1117 * yet persistent number. On Sparc platforms, this is possible,
1118 * but too bad there's no standards yet for x86 machines.
1120 if (ether_to_eui64(&wo->ourid)) {
1125 if (!wo->opt_local) { /* init interface identifier */
1126 if (wo->use_ip && eui64_iszero(wo->ourid)) {
1127 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr));
1128 if (!eui64_iszero(wo->ourid))
1132 while (eui64_iszero(wo->ourid))
1133 eui64_magic(wo->ourid);
1136 if (!wo->opt_remote) {
1137 if (wo->use_ip && eui64_iszero(wo->hisid)) {
1138 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr));
1139 if (!eui64_iszero(wo->hisid))
1144 if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) {
1145 option_error("local/remote LL address required for demand-dialling\n");
1146 exit(EXIT_OPTION_ERROR);
1152 * ipv6_demand_conf - configure the interface as though
1153 * IPV6CP were up, for use with dial-on-demand.
1156 ipv6_demand_conf(int u)
1158 ipv6cp_options *wo = &ipv6cp_wantoptions[u];
1162 if (!sif6addr(u, wo->ourid, wo->hisid))
1164 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1168 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE))
1170 if (wo->default_route)
1171 if (sif6defaultroute(u, wo->ourid, wo->hisid))
1172 default_route_set[u] = 1;
1174 notice("ipv6_demand_conf");
1175 notice("local LL address %s", llv6_ntoa(wo->ourid));
1176 notice("remote LL address %s", llv6_ntoa(wo->hisid));
1183 * ipv6cp_up - IPV6CP has come UP.
1185 * Configure the IPv6 network interface appropriately and bring it up.
1190 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
1191 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
1192 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
1194 IPV6CPDEBUG(("ipv6cp: up"));
1197 * We must have a non-zero LL address for both ends of the link.
1199 if (!ho->neg_ifaceid)
1200 ho->hisid = wo->hisid;
1202 if(!no_ifaceid_neg) {
1203 if (eui64_iszero(ho->hisid)) {
1204 error("Could not determine remote LL address");
1205 ipv6cp_close(f->unit, "Could not determine remote LL address");
1208 if (eui64_iszero(go->ourid)) {
1209 error("Could not determine local LL address");
1210 ipv6cp_close(f->unit, "Could not determine local LL address");
1213 if (eui64_equals(go->ourid, ho->hisid)) {
1214 error("local and remote LL addresses are equal");
1215 ipv6cp_close(f->unit, "local and remote LL addresses are equal");
1219 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0);
1220 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0);
1223 /* set tcp compression */
1224 sif6comp(f->unit, ho->neg_vj);
1228 * If we are doing dial-on-demand, the interface is already
1229 * configured, so we put out any saved-up packets, then set the
1230 * interface to pass IPv6 packets.
1233 if (! eui64_equals(go->ourid, wo->ourid) ||
1234 ! eui64_equals(ho->hisid, wo->hisid)) {
1235 if (! eui64_equals(go->ourid, wo->ourid))
1236 warn("Local LL address changed to %s",
1237 llv6_ntoa(go->ourid));
1238 if (! eui64_equals(ho->hisid, wo->hisid))
1239 warn("Remote LL address changed to %s",
1240 llv6_ntoa(ho->hisid));
1241 ipv6cp_clear_addrs(f->unit, go->ourid, ho->hisid);
1243 /* Set the interface to the new addresses */
1244 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1246 warn("sif6addr failed");
1247 ipv6cp_close(f->unit, "Interface configuration failed");
1251 /* assign a default route through the interface if required */
1252 if (ipv6cp_wantoptions[f->unit].default_route)
1253 if (sif6defaultroute(f->unit, go->ourid, ho->hisid))
1254 default_route_set[f->unit] = 1;
1256 demand_rexmit(PPP_IPV6);
1257 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1260 /* bring the interface up for IPv6 */
1261 if (!sif6up(f->unit)) {
1263 warn("sif6up failed (IPV6)");
1264 ipv6cp_close(f->unit, "Interface configuration failed");
1268 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1270 warn("sif6addr failed");
1271 ipv6cp_close(f->unit, "Interface configuration failed");
1274 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1276 /* assign a default route through the interface if required */
1277 if (ipv6cp_wantoptions[f->unit].default_route)
1278 if (sif6defaultroute(f->unit, go->ourid, ho->hisid))
1279 default_route_set[f->unit] = 1;
1281 notice("local LL address %s", llv6_ntoa(go->ourid));
1282 notice("remote LL address %s", llv6_ntoa(ho->hisid));
1285 np_up(f->unit, PPP_IPV6);
1288 notify(ipv6_up_notifier, 0);
1293 * Execute the ipv6-up script, like this:
1294 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL
1296 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) {
1297 ipv6cp_script_state = s_up;
1298 ipv6cp_script(_PATH_IPV6UP);
1304 * ipv6cp_down - IPV6CP has gone DOWN.
1306 * Take the IPv6 network interface down, clear its addresses
1307 * and delete routes through it.
1312 IPV6CPDEBUG(("ipv6cp: down"));
1313 update_link_stats(f->unit);
1314 notify(ipv6_down_notifier, 0);
1319 np_down(f->unit, PPP_IPV6);
1322 sif6comp(f->unit, 0);
1326 * If we are doing dial-on-demand, set the interface
1327 * to queue up outgoing packets (for now).
1330 sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE);
1332 sifnpmode(f->unit, PPP_IPV6, NPMODE_DROP);
1333 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC)))
1336 ipv6cp_clear_addrs(f->unit,
1337 ipv6cp_gotoptions[f->unit].ourid,
1338 ipv6cp_hisoptions[f->unit].hisid);
1339 #if defined(__linux__)
1341 #elif defined(SVR4) && (defined(SNI) || defined(__USLC))
1346 /* Execute the ipv6-down script */
1347 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) {
1348 ipv6cp_script_state = s_down;
1349 ipv6cp_script(_PATH_IPV6DOWN);
1355 * ipv6cp_clear_addrs() - clear the interface addresses, routes,
1356 * proxy neighbour discovery entries, etc.
1359 ipv6cp_clear_addrs(int unit, eui64_t ourid, eui64_t hisid)
1361 cif6addr(unit, ourid, hisid);
1366 * ipv6cp_finished - possibly shut down the lower layers.
1369 ipv6cp_finished(fsm *f)
1371 np_finished(f->unit, PPP_IPV6);
1376 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script
1380 ipv6cp_script_done(void *arg)
1382 ipv6cp_script_pid = 0;
1383 switch (ipv6cp_script_state) {
1385 if (ipv6cp_fsm[0].state != OPENED) {
1386 ipv6cp_script_state = s_down;
1387 ipv6cp_script(_PATH_IPV6DOWN);
1391 if (ipv6cp_fsm[0].state == OPENED) {
1392 ipv6cp_script_state = s_up;
1393 ipv6cp_script(_PATH_IPV6UP);
1401 * ipv6cp_script - Execute a script with arguments
1402 * interface-name tty-name speed local-LL remote-LL.
1405 ipv6cp_script(char *script)
1407 char strspeed[32], strlocal[32], strremote[32];
1410 sprintf(strspeed, "%d", baud_rate);
1411 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid));
1412 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid));
1419 argv[5] = strremote;
1423 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done,
1428 * ipv6cp_printpkt - print the contents of an IPV6CP packet.
1430 static char *ipv6cp_codenames[] = {
1431 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1432 "TermReq", "TermAck", "CodeRej"
1436 ipv6cp_printpkt(u_char *p, int plen,
1437 void (*printer) (void *, char *, ...), void *arg)
1439 int code, id, len, olen;
1440 u_char *pstart, *optend;
1444 if (plen < HEADERLEN)
1450 if (len < HEADERLEN || len > plen)
1453 if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *))
1454 printer(arg, " %s", ipv6cp_codenames[code-1]);
1456 printer(arg, " code=0x%x", code);
1457 printer(arg, " id=0x%x", id);
1464 /* print option list */
1469 if (olen < 2 || olen > len) {
1476 case CI_COMPRESSTYPE:
1477 if (olen >= CILEN_COMPRESS) {
1479 GETSHORT(cishort, p);
1480 printer(arg, "compress ");
1481 printer(arg, "0x%x", cishort);
1485 if (olen == CILEN_IFACEID) {
1487 eui64_get(ifaceid, p);
1488 printer(arg, "addr %s", llv6_ntoa(ifaceid));
1492 while (p < optend) {
1494 printer(arg, " %.2x", code);
1502 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1504 print_string((char *)p, len, printer, arg);
1511 /* print the rest of the bytes in the packet */
1512 for (; len > 0; --len) {
1514 printer(arg, " %.2x", code);
1521 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for.
1522 * We don't bring the link up for IP fragments or for TCP FIN packets
1525 #define IP6_HDRLEN 40 /* bytes */
1526 #define IP6_NHDR_FRAG 44 /* fragment IPv6 header */
1527 #define TCP_HDRLEN 20
1531 * We use these macros because the IP header may be at an odd address,
1532 * and some compilers might use word loads to get th_off or ip_hl.
1535 #define get_ip6nh(x) (((unsigned char *)(x))[6])
1536 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1537 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1540 ipv6_active_pkt(u_char *pkt, int len)
1546 if (len < IP6_HDRLEN)
1548 if (get_ip6nh(pkt) == IP6_NHDR_FRAG)
1550 if (get_ip6nh(pkt) != IPPROTO_TCP)
1552 if (len < IP6_HDRLEN + TCP_HDRLEN)
1554 tcp = pkt + IP6_HDRLEN;
1555 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4)