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)
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 default_route_set[NUM_PPP]; /* Have set up a default route */
181 static int ipv6cp_is_up;
182 static bool ipv6cp_noremote;
184 /* Hook for a plugin to know when IPv6 protocol has come up */
185 void (*ipv6_up_hook)(void) = NULL;
187 /* Hook for a plugin to know when IPv6 protocol has come down */
188 void (*ipv6_down_hook)(void) = NULL;
190 /* Notifiers for when IPCPv6 goes up and down */
191 struct notifier *ipv6_up_notifier = NULL;
192 struct notifier *ipv6_down_notifier = NULL;
195 * Callbacks for fsm code. (CI = Configuration Information)
197 static void ipv6cp_resetci (fsm *); /* Reset our CI */
198 static int ipv6cp_cilen (fsm *); /* Return length of our CI */
199 static void ipv6cp_addci (fsm *, u_char *, int *); /* Add our CI */
200 static int ipv6cp_ackci (fsm *, u_char *, int); /* Peer ack'd our CI */
201 static int ipv6cp_nakci (fsm *, u_char *, int, int);/* Peer nak'd our CI */
202 static int ipv6cp_rejci (fsm *, u_char *, int); /* Peer rej'd our CI */
203 static int ipv6cp_reqci (fsm *, u_char *, int *, int); /* Rcv CI */
204 static void ipv6cp_up (fsm *); /* We're UP */
205 static void ipv6cp_down (fsm *); /* We're DOWN */
206 static void ipv6cp_finished (fsm *); /* Don't need lower layer */
208 fsm ipv6cp_fsm[NUM_PPP]; /* IPV6CP fsm structure */
210 static fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */
211 ipv6cp_resetci, /* Reset our Configuration Information */
212 ipv6cp_cilen, /* Length of our Configuration Information */
213 ipv6cp_addci, /* Add our Configuration Information */
214 ipv6cp_ackci, /* ACK our Configuration Information */
215 ipv6cp_nakci, /* NAK our Configuration Information */
216 ipv6cp_rejci, /* Reject our Configuration Information */
217 ipv6cp_reqci, /* Request peer's Configuration Information */
218 ipv6cp_up, /* Called when fsm reaches OPENED state */
219 ipv6cp_down, /* Called when fsm leaves OPENED state */
220 NULL, /* Called when we want the lower layer up */
221 ipv6cp_finished, /* Called when we want the lower layer down */
222 NULL, /* Called when Protocol-Reject received */
223 NULL, /* Retransmission is necessary */
224 NULL, /* Called to handle protocol-specific codes */
225 "IPV6CP" /* String name of protocol */
229 * Command-line options.
231 static int setifaceid (char **arg);
232 static void printifaceid (option_t *,
233 void (*)(void *, char *, ...), void *);
235 static option_t ipv6cp_option_list[] = {
236 { "ipv6", o_special, (void *)setifaceid,
237 "Set interface identifiers for IPV6",
238 OPT_A2PRINTER, (void *)printifaceid },
240 { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag,
241 "Enable IPv6 and IPv6CP", OPT_PRIO | 1 },
242 { "noipv6", o_bool, &ipv6cp_protent.enabled_flag,
243 "Disable IPv6 and IPv6CP", OPT_PRIOSUB },
244 { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag,
245 "Disable IPv6 and IPv6CP", OPT_PRIOSUB | OPT_ALIAS },
247 { "ipv6cp-accept-local", o_bool, &ipv6cp_wantoptions[0].accept_local,
248 "Accept peer's interface identifier for us", 1 },
249 { "ipv6cp-accept-remote", o_bool, &ipv6cp_wantoptions[0].accept_remote,
250 "Accept peer's interface identifier for itself", 1 },
252 { "defaultroute6", o_bool, &ipv6cp_wantoptions[0].default_route,
253 "Add default IPv6 route", OPT_ENABLE|1, &ipv6cp_allowoptions[0].default_route },
254 { "nodefaultroute6", o_bool, &ipv6cp_allowoptions[0].default_route,
255 "disable defaultroute6 option", OPT_A2CLR,
256 &ipv6cp_wantoptions[0].default_route },
257 { "-defaultroute6", o_bool, &ipv6cp_allowoptions[0].default_route,
258 "disable defaultroute6 option", OPT_ALIAS | OPT_A2CLR,
259 &ipv6cp_wantoptions[0].default_route },
261 { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip,
262 "Use (default) IPv4 address as interface identifier", 1 },
264 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent,
265 "Use uniquely-available persistent value for link local address", 1 },
268 { "ipv6cp-noremote", o_bool, &ipv6cp_noremote,
269 "Allow peer to have no interface identifier", 1 },
272 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime,
273 "Set timeout for IPv6CP", OPT_PRIO },
274 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits,
275 "Set max #xmits for term-reqs", OPT_PRIO },
276 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits,
277 "Set max #xmits for conf-reqs", OPT_PRIO },
278 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops,
279 "Set max #conf-naks for IPv6CP", OPT_PRIO },
286 * Protocol entry points from main code.
288 static void ipv6cp_init (int);
289 static void ipv6cp_open (int);
290 static void ipv6cp_close (int, char *);
291 static void ipv6cp_lowerup (int);
292 static void ipv6cp_lowerdown (int);
293 static void ipv6cp_input (int, u_char *, int);
294 static void ipv6cp_protrej (int);
295 static int ipv6cp_printpkt (u_char *, int,
296 void (*) (void *, char *, ...), void *);
297 static void ipv6_check_options (void);
298 static int ipv6_demand_conf (int);
299 static int ipv6_active_pkt (u_char *, int);
301 struct protent ipv6cp_protent = {
321 static void ipv6cp_clear_addrs (int, eui64_t, eui64_t);
322 static void ipv6cp_script (char *);
323 static void ipv6cp_script_done (void *);
326 * Lengths of configuration options.
329 #define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */
330 #define CILEN_IFACEID 10 /* RFC2472, interface identifier */
332 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
333 (x) == CONFNAK ? "NAK" : "REJ")
336 * This state variable is used to ensure that we don't
337 * run an ipcp-up/down script while one is already running.
339 static enum script_state {
342 } ipv6cp_script_state;
343 static pid_t ipv6cp_script_pid;
346 * setifaceid - set the interface identifiers manually
349 setifaceid(char **argv)
351 char *comma, *arg, c;
352 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
353 struct in6_addr addr;
354 static int prio_local, prio_remote;
356 #define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \
357 (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) )
360 if ((comma = strchr(arg, ',')) == NULL)
361 comma = arg + strlen(arg);
364 * If comma first character, then no local identifier
370 if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) {
371 option_error("Illegal interface identifier (local): %s", arg);
375 if (option_priority >= prio_local) {
376 eui64_copy(addr.s6_addr32[2], wo->ourid);
378 prio_local = option_priority;
384 * If comma last character, the no remote identifier
386 if (*comma != 0 && *++comma != '\0') {
387 if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) {
388 option_error("Illegal interface identifier (remote): %s", comma);
391 if (option_priority >= prio_remote) {
392 eui64_copy(addr.s6_addr32[2], wo->hisid);
394 prio_remote = option_priority;
398 if (override_value("+ipv6", option_priority, option_source))
399 ipv6cp_protent.enabled_flag = 1;
403 char *llv6_ntoa(eui64_t ifaceid);
406 printifaceid(option_t *opt, void (*printer) (void *, char *, ...), void *arg)
408 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
411 printer(arg, "%s", llv6_ntoa(wo->ourid));
414 printer(arg, "%s", llv6_ntoa(wo->hisid));
418 * Make a string representation of a network address.
421 llv6_ntoa(eui64_t ifaceid)
425 sprintf(b, "fe80::%s", eui64_ntoa(ifaceid));
431 * ipv6cp_init - Initialize IPV6CP.
434 ipv6cp_init(int unit)
436 fsm *f = &ipv6cp_fsm[unit];
437 ipv6cp_options *wo = &ipv6cp_wantoptions[unit];
438 ipv6cp_options *ao = &ipv6cp_allowoptions[unit];
441 f->protocol = PPP_IPV6CP;
442 f->callbacks = &ipv6cp_callbacks;
443 fsm_init(&ipv6cp_fsm[unit]);
445 memset(wo, 0, sizeof(*wo));
446 memset(ao, 0, sizeof(*ao));
448 wo->accept_local = 0;
449 wo->accept_remote = 0;
456 wo->vj_protocol = IPV6CP_COMP;
460 * XXX This controls whether the user may use the defaultroute option.
462 ao->default_route = 1;
467 * ipv6cp_open - IPV6CP is allowed to come up.
470 ipv6cp_open(int unit)
472 fsm_open(&ipv6cp_fsm[unit]);
477 * ipv6cp_close - Take IPV6CP down.
480 ipv6cp_close(int unit, char *reason)
482 fsm_close(&ipv6cp_fsm[unit], reason);
487 * ipv6cp_lowerup - The lower layer is up.
490 ipv6cp_lowerup(int unit)
492 fsm_lowerup(&ipv6cp_fsm[unit]);
497 * ipv6cp_lowerdown - The lower layer is down.
500 ipv6cp_lowerdown(int unit)
502 fsm_lowerdown(&ipv6cp_fsm[unit]);
507 * ipv6cp_input - Input IPV6CP packet.
510 ipv6cp_input(int unit, u_char *p, int len)
512 fsm_input(&ipv6cp_fsm[unit], p, len);
517 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP.
519 * Pretend the lower layer went down, so we shut up.
522 ipv6cp_protrej(int unit)
524 fsm_lowerdown(&ipv6cp_fsm[unit]);
529 * ipv6cp_resetci - Reset our CI.
532 ipv6cp_resetci(fsm *f)
534 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
535 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
537 wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid;
539 if (!wo->opt_local) {
540 wo->accept_local = 1;
542 eui64_magic_nz(wo->ourid);
545 wo->accept_remote = 1;
548 eui64_zero(go->hisid); /* last proposed interface identifier */
553 * ipv6cp_cilen - Return length of our CI.
558 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
560 #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0)
561 #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0)
563 return (LENCIIFACEID(go->neg_ifaceid) +
564 LENCIVJ(go->neg_vj));
569 * ipv6cp_addci - Add our desired CIs to a packet.
572 ipv6cp_addci(fsm *f, u_char *ucp, int *lenp)
574 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
577 #define ADDCIVJ(opt, neg, val) \
579 int vjlen = CILEN_COMPRESS; \
580 if (len >= vjlen) { \
582 PUTCHAR(vjlen, ucp); \
583 PUTSHORT(val, ucp); \
589 #define ADDCIIFACEID(opt, neg, val1) \
591 int idlen = CILEN_IFACEID; \
592 if (len >= idlen) { \
594 PUTCHAR(idlen, ucp); \
595 eui64_put(val1, ucp); \
601 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
603 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
610 * ipv6cp_ackci - Ack our CIs.
617 ipv6cp_ackci(fsm *f, u_char *p, int len)
619 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
620 u_short cilen, citype, cishort;
624 * CIs must be in exactly the same order that we sent...
625 * Check packet length and CI length at each step.
626 * If we find any deviations, then this packet is bad.
629 #define ACKCIVJ(opt, neg, val) \
631 int vjlen = CILEN_COMPRESS; \
632 if ((len -= vjlen) < 0) \
634 GETCHAR(citype, p); \
636 if (cilen != vjlen || \
639 GETSHORT(cishort, p); \
640 if (cishort != val) \
644 #define ACKCIIFACEID(opt, neg, val1) \
646 int idlen = CILEN_IFACEID; \
647 if ((len -= idlen) < 0) \
649 GETCHAR(citype, p); \
651 if (cilen != idlen || \
654 eui64_get(ifaceid, p); \
655 if (! eui64_equals(val1, ifaceid)) \
659 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
661 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
664 * If there are any remaining CIs, then this packet is bad.
671 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!"));
676 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs.
677 * This should not modify any state if the Nak is bad
678 * or if IPV6CP is in the OPENED state.
685 ipv6cp_nakci(fsm *f, u_char *p, int len, int 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 && !eui64_iszero(ifaceid) && !eui64_equals(ifaceid, go->hisid)) {
735 } else if (eui64_iszero(ifaceid) && !go->opt_local) {
736 while (eui64_iszero(ifaceid) ||
737 eui64_equals(ifaceid, go->hisid)) /* bad luck */
738 eui64_magic(ifaceid);
740 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid)));
745 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
747 if (cishort == IPV6CP_COMP && !treat_as_reject) {
748 try.vj_protocol = cishort;
755 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
763 * There may be remaining CIs, if the peer is requesting negotiation
764 * on an option that we didn't include in our request packet.
765 * If they want to negotiate about interface identifier, we comply.
766 * If they want us to ask for compression, we refuse.
768 while (len >= CILEN_VOID) {
771 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
773 next = p + cilen - 2;
776 case CI_COMPRESSTYPE:
777 if (go->neg_vj || no.neg_vj ||
778 (cilen != CILEN_COMPRESS))
783 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID)
786 eui64_get(ifaceid, p);
787 if (go->accept_local && !eui64_iszero(ifaceid) && !eui64_equals(ifaceid, go->hisid)) {
789 } else if (eui64_iszero(ifaceid) && !go->opt_local) {
790 while (eui64_iszero(ifaceid) ||
791 eui64_equals(ifaceid, go->hisid)) /* bad luck */
792 eui64_magic(ifaceid);
803 /* If there is still anything left, this packet is bad. */
808 * OK, the Nak is good. Now we can update state.
810 if (f->state != OPENED)
816 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!"));
822 * ipv6cp_rejci - Reject some of our CIs.
825 ipv6cp_rejci(fsm *f, u_char *p, int len)
827 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
831 ipv6cp_options try; /* options to request next time */
835 * Any Rejected CIs must be in exactly the same order that we sent.
836 * Check packet length and CI length at each step.
837 * If we find any deviations, then this packet is bad.
839 #define REJCIIFACEID(opt, neg, val1) \
841 len >= (cilen = CILEN_IFACEID) && \
846 eui64_get(ifaceid, p); \
847 /* Check rejected value. */ \
848 if (! eui64_equals(ifaceid, val1)) \
853 #define REJCIVJ(opt, neg, val) \
855 p[1] == CILEN_COMPRESS && \
860 GETSHORT(cishort, p); \
861 /* Check rejected value. */ \
862 if (cishort != val) \
867 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid);
869 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol);
872 * If there are any remaining CIs, then this packet is bad.
877 * Now we can update state.
879 if (f->state != OPENED)
884 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!"));
890 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response.
892 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
893 * appropriately. If reject_if_disagree is non-zero, doesn't return
894 * CONFNAK; returns CONFREJ if it can't return CONFACK.
897 ipv6cp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree)
899 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
900 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
901 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit];
902 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
903 u_char *cip, *next; /* Pointer to current and next CIs */
904 u_short cilen, citype; /* Parsed len, type */
905 u_short cishort; /* Parsed short value */
906 eui64_t ifaceid; /* Parsed interface identifier */
907 int rc = CONFACK; /* Final packet return code */
908 int orc; /* Individual option return code */
909 u_char *p; /* Pointer to next char to parse */
910 u_char *ucp = inp; /* Pointer to current output char */
911 int l = *len; /* Length left */
914 * Reset all his options.
916 BZERO(ho, sizeof(*ho));
919 * Process all his options.
923 orc = CONFACK; /* Assume success */
924 cip = p = next; /* Remember begining of CI */
925 if (l < 2 || /* Not enough data for CI header or */
926 p[1] < 2 || /* CI length too small or */
927 p[1] > l) { /* CI length too big? */
928 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!"));
929 orc = CONFREJ; /* Reject bad CI */
930 cilen = l; /* Reject till end of packet */
931 l = 0; /* Don't loop again */
934 GETCHAR(citype, p); /* Parse CI type */
935 GETCHAR(cilen, p); /* Parse CI length */
936 l -= cilen; /* Adjust remaining length */
937 next += cilen; /* Step to next CI */
939 switch (citype) { /* Check CI type */
941 IPV6CPDEBUG(("ipv6cp: received interface identifier "));
943 if (!ao->neg_ifaceid ||
944 cilen != CILEN_IFACEID) { /* Check CI length */
945 orc = CONFREJ; /* Reject CI */
950 * If he has no interface identifier, or if we both have same
951 * identifier then NAK it with new idea.
952 * In particular, if we don't know his identifier, but he does,
955 eui64_get(ifaceid, p);
956 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid)));
957 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) {
958 orc = CONFREJ; /* Reject CI */
961 if (!eui64_iszero(wo->hisid) && !wo->accept_remote &&
962 !eui64_equals(ifaceid, wo->hisid)) {
967 DECPTR(sizeof(ifaceid), p);
968 eui64_put(ifaceid, p);
970 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) {
972 if (eui64_iszero(go->hisid)) /* first time, try option */
974 if (eui64_equals(ifaceid, go->ourid)) /* bad luck */
976 if (eui64_iszero(ifaceid)) {
980 while (eui64_iszero(ifaceid) ||
981 eui64_equals(ifaceid, go->ourid)) /* bad luck */
982 eui64_magic(ifaceid);
986 DECPTR(sizeof(ifaceid), p);
987 eui64_put(ifaceid, p);
994 case CI_COMPRESSTYPE:
995 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE "));
997 (cilen != CILEN_COMPRESS)) {
1001 GETSHORT(cishort, p);
1002 IPV6CPDEBUG(("(%d)", cishort));
1005 if (!(cishort == IPV6CP_COMP)) {
1011 ho->vj_protocol = cishort;
1024 IPV6CPDEBUG((" (%s)\n", CODENAME(orc)));
1026 if (orc == CONFACK && /* Good CI */
1027 rc != CONFACK) /* but prior CI wasnt? */
1028 continue; /* Don't send this one */
1030 if (orc == CONFNAK) { /* Nak this CI? */
1031 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1032 orc = CONFREJ; /* Get tough if so */
1034 if (rc == CONFREJ) /* Rejecting prior CI? */
1035 continue; /* Don't send this one */
1036 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1037 rc = CONFNAK; /* Not anymore... */
1038 ucp = inp; /* Backup */
1043 if (orc == CONFREJ && /* Reject this CI */
1044 rc != CONFREJ) { /* but no prior ones? */
1046 ucp = inp; /* Backup */
1049 /* Need to move CI? */
1051 BCOPY(cip, ucp, cilen); /* Move it */
1053 /* Update output pointer */
1058 * If we aren't rejecting this packet, and we want to negotiate
1059 * their identifier and they didn't send their identifier, then we
1060 * send a NAK with a CI_IFACEID option appended. We assume the
1061 * input buffer is long enough that we can append the extra
1064 if (rc != CONFREJ && !ho->neg_ifaceid &&
1065 wo->req_ifaceid && !reject_if_disagree) {
1066 if (rc == CONFACK) {
1068 ucp = inp; /* reset pointer */
1069 wo->req_ifaceid = 0; /* don't ask again */
1071 PUTCHAR(CI_IFACEID, ucp);
1072 PUTCHAR(CILEN_IFACEID, ucp);
1073 eui64_put(wo->hisid, ucp);
1076 *len = ucp - inp; /* Compute output length */
1077 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc)));
1078 return (rc); /* Return final code */
1083 * ether_to_eui64 - Convert 48-bit Ethernet address into 64-bit EUI
1085 * walks the list of valid ethernet interfaces, starting with devnam
1086 * (for PPPoE it is ethernet interface), and convert the first
1087 * found 48-bit MAC address into EUI 64. caller also assumes that
1088 * the system has a properly configured Ethernet interface for this
1089 * function to return non-zero.
1092 ether_to_eui64(eui64_t *p_eui64)
1096 if (get_if_hwaddr(addr, devnam) < 0 && get_first_ether_hwaddr(addr) < 0) {
1097 error("ipv6cp: no persistent id can be found");
1102 * And convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1]
1104 p_eui64->e8[0] = addr[0] | 0x02;
1105 p_eui64->e8[1] = addr[1];
1106 p_eui64->e8[2] = addr[2];
1107 p_eui64->e8[3] = 0xFF;
1108 p_eui64->e8[4] = 0xFE;
1109 p_eui64->e8[5] = addr[3];
1110 p_eui64->e8[6] = addr[4];
1111 p_eui64->e8[7] = addr[5];
1118 * ipv6_check_options - check that any IP-related options are OK,
1119 * and assign appropriate defaults.
1122 ipv6_check_options(void)
1124 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
1126 if (!ipv6cp_protent.enabled_flag)
1130 * Persistent link-local id is only used when user has not explicitly
1131 * configure/hard-code the id
1133 if ((wo->use_persistent) && (!wo->opt_local)) {
1136 * On systems where there are no Ethernet interfaces used, there
1137 * may be other ways to obtain a persistent id. Right now, it
1138 * will fall back to using magic [see eui64_magic] below when
1139 * an EUI-48 from MAC address can't be obtained. Other possibilities
1140 * include obtaining EEPROM serial numbers, or some other unique
1141 * yet persistent number. On Sparc platforms, this is possible,
1142 * but too bad there's no standards yet for x86 machines.
1144 if (ether_to_eui64(&wo->ourid)) {
1149 if (!wo->opt_local) { /* init interface identifier */
1150 if (wo->use_ip && eui64_iszero(wo->ourid)) {
1151 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr));
1152 if (!eui64_iszero(wo->ourid))
1156 while (eui64_iszero(wo->ourid))
1157 eui64_magic(wo->ourid);
1160 if (!wo->opt_remote) {
1161 if (wo->use_ip && eui64_iszero(wo->hisid)) {
1162 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr));
1163 if (!eui64_iszero(wo->hisid))
1171 * ipv6_demand_conf - configure the interface as though
1172 * IPV6CP were up, for use with dial-on-demand.
1175 ipv6_demand_conf(int u)
1177 ipv6cp_options *wo = &ipv6cp_wantoptions[u];
1179 if (eui64_iszero(wo->hisid) && !ipv6cp_noremote) {
1180 /* make up an arbitrary identifier for the peer */
1181 eui64_magic_nz(wo->hisid);
1183 if (eui64_iszero(wo->ourid)) {
1184 /* make up an arbitrary identifier for us */
1185 eui64_magic_nz(wo->ourid);
1190 if (!sif6addr(u, wo->ourid, wo->hisid))
1192 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1196 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE))
1198 if (wo->default_route)
1199 if (sif6defaultroute(u, wo->ourid, wo->hisid))
1200 default_route_set[u] = 1;
1202 notice("local LL address %s", llv6_ntoa(wo->ourid));
1203 if (!eui64_iszero(wo->hisid))
1204 notice("remote LL address %s", llv6_ntoa(wo->hisid));
1211 * ipv6cp_up - IPV6CP has come UP.
1213 * Configure the IPv6 network interface appropriately and bring it up.
1218 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
1219 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
1220 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
1222 IPV6CPDEBUG(("ipv6cp: up"));
1225 * We must have a non-zero LL address for both ends of the link.
1228 if (!eui64_iszero(wo->hisid) && !wo->accept_remote && (!ho->neg_ifaceid || !eui64_equals(ho->hisid, wo->hisid))) {
1229 error("Peer refused to agree to his interface identifier");
1230 ipv6cp_close(f->unit, "Refused his interface identifier");
1233 if (!ho->neg_ifaceid)
1234 ho->hisid = wo->hisid;
1236 if(!no_ifaceid_neg) {
1237 if (eui64_iszero(ho->hisid) && !ipv6cp_noremote) {
1238 error("Could not determine remote LL address");
1239 ipv6cp_close(f->unit, "Could not determine remote LL address");
1242 if (eui64_iszero(go->ourid)) {
1243 error("Could not determine local LL address");
1244 ipv6cp_close(f->unit, "Could not determine local LL address");
1247 if (eui64_equals(go->ourid, ho->hisid)) {
1248 error("local and remote LL addresses are equal");
1249 ipv6cp_close(f->unit, "local and remote LL addresses are equal");
1253 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0);
1254 if (!eui64_iszero(ho->hisid))
1255 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0);
1258 /* set tcp compression */
1259 sif6comp(f->unit, ho->neg_vj);
1263 * If we are doing dial-on-demand, the interface is already
1264 * configured, so we put out any saved-up packets, then set the
1265 * interface to pass IPv6 packets.
1268 if (! eui64_equals(go->ourid, wo->ourid) ||
1269 ! eui64_equals(ho->hisid, wo->hisid)) {
1270 if (! eui64_equals(go->ourid, wo->ourid))
1271 warn("Local LL address changed to %s",
1272 llv6_ntoa(go->ourid));
1273 if (! eui64_equals(ho->hisid, wo->hisid))
1274 warn("Remote LL address changed to %s",
1275 llv6_ntoa(ho->hisid));
1276 ipv6cp_clear_addrs(f->unit, wo->ourid, wo->hisid);
1278 /* Set the interface to the new addresses */
1279 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1281 warn("sif6addr failed");
1282 ipv6cp_close(f->unit, "Interface configuration failed");
1286 /* assign a default route through the interface if required */
1287 if (ipv6cp_wantoptions[f->unit].default_route)
1288 if (sif6defaultroute(f->unit, go->ourid, ho->hisid))
1289 default_route_set[f->unit] = 1;
1291 demand_rexmit(PPP_IPV6);
1292 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1295 /* bring the interface up for IPv6 */
1296 if (!sif6up(f->unit)) {
1298 warn("sif6up failed (IPV6)");
1299 ipv6cp_close(f->unit, "Interface configuration failed");
1303 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1305 warn("sif6addr failed");
1306 ipv6cp_close(f->unit, "Interface configuration failed");
1309 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1311 /* assign a default route through the interface if required */
1312 if (ipv6cp_wantoptions[f->unit].default_route)
1313 if (sif6defaultroute(f->unit, go->ourid, ho->hisid))
1314 default_route_set[f->unit] = 1;
1316 notice("local LL address %s", llv6_ntoa(go->ourid));
1317 if (!eui64_iszero(ho->hisid))
1318 notice("remote LL address %s", llv6_ntoa(ho->hisid));
1321 np_up(f->unit, PPP_IPV6);
1324 notify(ipv6_up_notifier, 0);
1329 * Execute the ipv6-up script, like this:
1330 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL
1332 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) {
1333 ipv6cp_script_state = s_up;
1334 ipv6cp_script(path_ipv6up);
1340 * ipv6cp_down - IPV6CP has gone DOWN.
1342 * Take the IPv6 network interface down, clear its addresses
1343 * and delete routes through it.
1348 IPV6CPDEBUG(("ipv6cp: down"));
1349 update_link_stats(f->unit);
1350 notify(ipv6_down_notifier, 0);
1355 np_down(f->unit, PPP_IPV6);
1358 sif6comp(f->unit, 0);
1362 * If we are doing dial-on-demand, set the interface
1363 * to queue up outgoing packets (for now).
1366 sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE);
1368 sifnpmode(f->unit, PPP_IPV6, NPMODE_DROP);
1369 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC)))
1372 ipv6cp_clear_addrs(f->unit,
1373 ipv6cp_gotoptions[f->unit].ourid,
1374 ipv6cp_hisoptions[f->unit].hisid);
1375 #if defined(__linux__)
1377 #elif defined(SVR4) && (defined(SNI) || defined(__USLC))
1382 /* Execute the ipv6-down script */
1383 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) {
1384 ipv6cp_script_state = s_down;
1385 ipv6cp_script(path_ipv6down);
1391 * ipv6cp_clear_addrs() - clear the interface addresses, routes,
1392 * proxy neighbour discovery entries, etc.
1395 ipv6cp_clear_addrs(int unit, eui64_t ourid, eui64_t hisid)
1397 cif6addr(unit, ourid, hisid);
1402 * ipv6cp_finished - possibly shut down the lower layers.
1405 ipv6cp_finished(fsm *f)
1407 np_finished(f->unit, PPP_IPV6);
1412 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script
1416 ipv6cp_script_done(void *arg)
1418 ipv6cp_script_pid = 0;
1419 switch (ipv6cp_script_state) {
1421 if (ipv6cp_fsm[0].state != OPENED) {
1422 ipv6cp_script_state = s_down;
1423 ipv6cp_script(path_ipv6down);
1427 if (ipv6cp_fsm[0].state == OPENED) {
1428 ipv6cp_script_state = s_up;
1429 ipv6cp_script(path_ipv6up);
1437 * ipv6cp_script - Execute a script with arguments
1438 * interface-name tty-name speed local-LL remote-LL.
1441 ipv6cp_script(char *script)
1443 char strspeed[32], strlocal[32], strremote[32];
1446 sprintf(strspeed, "%d", baud_rate);
1447 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid));
1448 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid));
1455 argv[5] = strremote;
1459 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done,
1464 * ipv6cp_printpkt - print the contents of an IPV6CP packet.
1466 static char *ipv6cp_codenames[] = {
1467 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1468 "TermReq", "TermAck", "CodeRej"
1472 ipv6cp_printpkt(u_char *p, int plen,
1473 void (*printer) (void *, char *, ...), void *arg)
1475 int code, id, len, olen;
1476 u_char *pstart, *optend;
1480 if (plen < HEADERLEN)
1486 if (len < HEADERLEN || len > plen)
1489 if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *))
1490 printer(arg, " %s", ipv6cp_codenames[code-1]);
1492 printer(arg, " code=0x%x", code);
1493 printer(arg, " id=0x%x", id);
1500 /* print option list */
1505 if (olen < 2 || olen > len) {
1512 case CI_COMPRESSTYPE:
1513 if (olen >= CILEN_COMPRESS) {
1515 GETSHORT(cishort, p);
1516 printer(arg, "compress ");
1517 printer(arg, "0x%x", cishort);
1521 if (olen == CILEN_IFACEID) {
1523 eui64_get(ifaceid, p);
1524 printer(arg, "addr %s", llv6_ntoa(ifaceid));
1528 while (p < optend) {
1530 printer(arg, " %.2x", code);
1538 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1540 print_string((char *)p, len, printer, arg);
1547 /* print the rest of the bytes in the packet */
1548 for (; len > 0; --len) {
1550 printer(arg, " %.2x", code);
1557 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for.
1558 * We don't bring the link up for IP fragments or for TCP FIN packets
1561 #define IP6_HDRLEN 40 /* bytes */
1562 #define IP6_NHDR_FRAG 44 /* fragment IPv6 header */
1563 #define TCP_HDRLEN 20
1567 * We use these macros because the IP header may be at an odd address,
1568 * and some compilers might use word loads to get th_off or ip_hl.
1571 #define get_ip6nh(x) (((unsigned char *)(x))[6])
1572 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1573 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1576 ipv6_active_pkt(u_char *pkt, int len)
1582 if (len < IP6_HDRLEN)
1584 if (get_ip6nh(pkt) == IP6_NHDR_FRAG)
1586 if (get_ip6nh(pkt) != IPPROTO_TCP)
1588 if (len < IP6_HDRLEN + TCP_HDRLEN)
1590 tcp = pkt + IP6_HDRLEN;
1591 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4)