2 * ipv6cp.c - PPP IPV6 Control Protocol.
4 * Copyright (c) 1999 Tommi Komulainen. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. The name(s) of the authors of this software must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission.
22 * 4. Redistributions of any form whatsoever must retain the following
24 * "This product includes software developed by Tommi Komulainen
25 * <Tommi.Komulainen@iki.fi>".
27 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
28 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
29 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
30 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
31 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
32 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
33 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
37 /* Original version, based on RFC2023 :
39 Copyright (c) 1995, 1996, 1997 Francis.Dupont@inria.fr, INRIA Rocquencourt,
40 Alain.Durand@imag.fr, IMAG,
41 Jean-Luc.Richier@imag.fr, IMAG-LSR.
43 Copyright (c) 1998, 1999 Francis.Dupont@inria.fr, GIE DYADE,
44 Alain.Durand@imag.fr, IMAG,
45 Jean-Luc.Richier@imag.fr, IMAG-LSR.
47 Ce travail a été fait au sein du GIE DYADE (Groupement d'Intérêt
48 Économique ayant pour membres BULL S.A. et l'INRIA).
50 Ce logiciel informatique est disponible aux conditions
51 usuelles dans la recherche, c'est-à-dire qu'il peut
52 être utilisé, copié, modifié, distribué à l'unique
53 condition que ce texte soit conservé afin que
54 l'origine de ce logiciel soit reconnue.
56 Le nom de l'Institut National de Recherche en Informatique
57 et en Automatique (INRIA), de l'IMAG, ou d'une personne morale
58 ou physique ayant participé à l'élaboration de ce logiciel ne peut
59 être utilisé sans son accord préalable explicite.
61 Ce logiciel est fourni tel quel sans aucune garantie,
62 support ou responsabilité d'aucune sorte.
63 Ce logiciel est dérivé de sources d'origine
64 "University of California at Berkeley" et
65 "Digital Equipment Corporation" couvertes par des copyrights.
67 L'Institut d'Informatique et de Mathématiques Appliquées de Grenoble (IMAG)
68 est une fédération d'unités mixtes de recherche du CNRS, de l'Institut National
69 Polytechnique de Grenoble et de l'Université Joseph Fourier regroupant
70 sept laboratoires dont le laboratoire Logiciels, Systèmes, Réseaux (LSR).
72 This work has been done in the context of GIE DYADE (joint R & D venture
73 between BULL S.A. and INRIA).
75 This software is available with usual "research" terms
76 with the aim of retain credits of the software.
77 Permission to use, copy, modify and distribute this software for any
78 purpose and without fee is hereby granted, provided that the above
79 copyright notice and this permission notice appear in all copies,
80 and the name of INRIA, IMAG, or any contributor not be used in advertising
81 or publicity pertaining to this material without the prior explicit
82 permission. The software is provided "as is" without any
83 warranties, support or liabilities of any kind.
84 This software is derived from source code from
85 "University of California at Berkeley" and
86 "Digital Equipment Corporation" protected by copyrights.
88 Grenoble's Institute of Computer Science and Applied Mathematics (IMAG)
89 is a federation of seven research units funded by the CNRS, National
90 Polytechnic Institute of Grenoble and University Joseph Fourier.
91 The research unit in Software, Systems, Networks (LSR) is member of IMAG.
98 * ipcp.c - PPP IP Control Protocol.
100 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
102 * Redistribution and use in source and binary forms, with or without
103 * modification, are permitted provided that the following conditions
106 * 1. Redistributions of source code must retain the above copyright
107 * notice, this list of conditions and the following disclaimer.
109 * 2. Redistributions in binary form must reproduce the above copyright
110 * notice, this list of conditions and the following disclaimer in
111 * the documentation and/or other materials provided with the
114 * 3. The name "Carnegie Mellon University" must not be used to
115 * endorse or promote products derived from this software without
116 * prior written permission. For permission or any legal
117 * details, please contact
118 * Office of Technology Transfer
119 * Carnegie Mellon University
121 * Pittsburgh, PA 15213-3890
122 * (412) 268-4387, fax: (412) 268-7395
123 * tech-transfer@andrew.cmu.edu
125 * 4. Redistributions of any form whatsoever must retain the following
127 * "This product includes software developed by Computing Services
128 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
130 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
131 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
132 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
133 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
134 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
135 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
136 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
138 * $Id: ipv6cp.c,v 1.21 2005/08/25 23:59:34 paulus Exp $
141 #define RCSID "$Id: ipv6cp.c,v 1.21 2005/08/25 23:59:34 paulus Exp $"
146 * Proxy Neighbour Discovery.
148 * Better defines for selecting the ordering of
149 * interface up / set address. (currently checks for __linux__,
150 * since SVR4 && (SNI || __USLC__) didn't work properly)
158 #include <sys/param.h>
159 #include <sys/types.h>
160 #include <sys/socket.h>
161 #include <netinet/in.h>
162 #include <arpa/inet.h>
169 #include "pathnames.h"
173 ipv6cp_options ipv6cp_wantoptions[NUM_PPP]; /* Options that we want to request */
174 ipv6cp_options ipv6cp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
175 ipv6cp_options ipv6cp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
176 ipv6cp_options ipv6cp_hisoptions[NUM_PPP]; /* Options that we ack'd */
177 int no_ifaceid_neg = 0;
180 static int default_route_set[NUM_PPP]; /* Have set up a default route */
181 static int ipv6cp_is_up;
183 /* Hook for a plugin to know when IPv6 protocol has come up */
184 void (*ipv6_up_hook) __P((void)) = NULL;
186 /* Hook for a plugin to know when IPv6 protocol has come down */
187 void (*ipv6_down_hook) __P((void)) = NULL;
189 /* Notifiers for when IPCPv6 goes up and down */
190 struct notifier *ipv6_up_notifier = NULL;
191 struct notifier *ipv6_down_notifier = NULL;
194 * Callbacks for fsm code. (CI = Configuration Information)
196 static void ipv6cp_resetci __P((fsm *)); /* Reset our CI */
197 static int ipv6cp_cilen __P((fsm *)); /* Return length of our CI */
198 static void ipv6cp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
199 static int ipv6cp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
200 static int ipv6cp_nakci __P((fsm *, u_char *, int, int));/* Peer nak'd our CI */
201 static int ipv6cp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
202 static int ipv6cp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
203 static void ipv6cp_up __P((fsm *)); /* We're UP */
204 static void ipv6cp_down __P((fsm *)); /* We're DOWN */
205 static void ipv6cp_finished __P((fsm *)); /* Don't need lower layer */
207 fsm ipv6cp_fsm[NUM_PPP]; /* IPV6CP fsm structure */
209 static fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */
210 ipv6cp_resetci, /* Reset our Configuration Information */
211 ipv6cp_cilen, /* Length of our Configuration Information */
212 ipv6cp_addci, /* Add our Configuration Information */
213 ipv6cp_ackci, /* ACK our Configuration Information */
214 ipv6cp_nakci, /* NAK our Configuration Information */
215 ipv6cp_rejci, /* Reject our Configuration Information */
216 ipv6cp_reqci, /* Request peer's Configuration Information */
217 ipv6cp_up, /* Called when fsm reaches OPENED state */
218 ipv6cp_down, /* Called when fsm leaves OPENED state */
219 NULL, /* Called when we want the lower layer up */
220 ipv6cp_finished, /* Called when we want the lower layer down */
221 NULL, /* Called when Protocol-Reject received */
222 NULL, /* Retransmission is necessary */
223 NULL, /* Called to handle protocol-specific codes */
224 "IPV6CP" /* String name of protocol */
228 * Command-line options.
230 static int setifaceid __P((char **arg));
231 static void printifaceid __P((option_t *,
232 void (*)(void *, char *, ...), void *));
234 static option_t ipv6cp_option_list[] = {
235 { "ipv6", o_special, (void *)setifaceid,
236 "Set interface identifiers for IPV6",
237 OPT_A2PRINTER, (void *)printifaceid },
239 { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag,
240 "Enable IPv6 and IPv6CP", OPT_PRIO | 1 },
241 { "noipv6", o_bool, &ipv6cp_protent.enabled_flag,
242 "Disable IPv6 and IPv6CP", OPT_PRIOSUB },
243 { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag,
244 "Disable IPv6 and IPv6CP", OPT_PRIOSUB | OPT_ALIAS },
246 { "ipv6cp-accept-local", o_bool, &ipv6cp_allowoptions[0].accept_local,
247 "Accept peer's interface identifier for us", 1 },
249 { "defaultroute6", o_bool, &ipv6cp_wantoptions[0].default_route,
250 "Add default IPv6 route", OPT_ENABLE|1, &ipv6cp_allowoptions[0].default_route },
251 { "nodefaultroute6", o_bool, &ipv6cp_allowoptions[0].default_route,
252 "disable defaultroute6 option", OPT_A2CLR,
253 &ipv6cp_wantoptions[0].default_route },
254 { "-defaultroute6", o_bool, &ipv6cp_allowoptions[0].default_route,
255 "disable defaultroute6 option", OPT_ALIAS | OPT_A2CLR,
256 &ipv6cp_wantoptions[0].default_route },
258 { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip,
259 "Use (default) IPv4 address as interface identifier", 1 },
261 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent,
262 "Use uniquely-available persistent value for link local address", 1 },
264 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime,
265 "Set timeout for IPv6CP", OPT_PRIO },
266 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits,
267 "Set max #xmits for term-reqs", OPT_PRIO },
268 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits,
269 "Set max #xmits for conf-reqs", OPT_PRIO },
270 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops,
271 "Set max #conf-naks for IPv6CP", OPT_PRIO },
278 * Protocol entry points from main code.
280 static void ipv6cp_init __P((int));
281 static void ipv6cp_open __P((int));
282 static void ipv6cp_close __P((int, char *));
283 static void ipv6cp_lowerup __P((int));
284 static void ipv6cp_lowerdown __P((int));
285 static void ipv6cp_input __P((int, u_char *, int));
286 static void ipv6cp_protrej __P((int));
287 static int ipv6cp_printpkt __P((u_char *, int,
288 void (*) __P((void *, char *, ...)), void *));
289 static void ipv6_check_options __P((void));
290 static int ipv6_demand_conf __P((int));
291 static int ipv6_active_pkt __P((u_char *, int));
293 struct protent ipv6cp_protent = {
313 static void ipv6cp_clear_addrs __P((int, eui64_t, eui64_t));
314 static void ipv6cp_script __P((char *));
315 static void ipv6cp_script_done __P((void *));
318 * Lengths of configuration options.
321 #define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */
322 #define CILEN_IFACEID 10 /* RFC2472, interface identifier */
324 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
325 (x) == CONFNAK ? "NAK" : "REJ")
328 * This state variable is used to ensure that we don't
329 * run an ipcp-up/down script while one is already running.
331 static enum script_state {
334 } ipv6cp_script_state;
335 static pid_t ipv6cp_script_pid;
338 * setifaceid - set the interface identifiers manually
344 char *comma, *arg, c;
345 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
346 struct in6_addr addr;
347 static int prio_local, prio_remote;
349 #define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \
350 (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) )
353 if ((comma = strchr(arg, ',')) == NULL)
354 comma = arg + strlen(arg);
357 * If comma first character, then no local identifier
363 if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) {
364 option_error("Illegal interface identifier (local): %s", arg);
368 if (option_priority >= prio_local) {
369 eui64_copy(addr.s6_addr32[2], wo->ourid);
371 prio_local = option_priority;
377 * If comma last character, the no remote identifier
379 if (*comma != 0 && *++comma != '\0') {
380 if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) {
381 option_error("Illegal interface identifier (remote): %s", comma);
384 if (option_priority >= prio_remote) {
385 eui64_copy(addr.s6_addr32[2], wo->hisid);
387 prio_remote = option_priority;
391 if (override_value("+ipv6", option_priority, option_source))
392 ipv6cp_protent.enabled_flag = 1;
396 char *llv6_ntoa(eui64_t ifaceid);
399 printifaceid(opt, printer, arg)
401 void (*printer) __P((void *, char *, ...));
404 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
407 printer(arg, "%s", llv6_ntoa(wo->ourid));
410 printer(arg, "%s", llv6_ntoa(wo->hisid));
414 * Make a string representation of a network address.
422 sprintf(b, "fe80::%s", eui64_ntoa(ifaceid));
428 * ipv6cp_init - Initialize IPV6CP.
434 fsm *f = &ipv6cp_fsm[unit];
435 ipv6cp_options *wo = &ipv6cp_wantoptions[unit];
436 ipv6cp_options *ao = &ipv6cp_allowoptions[unit];
439 f->protocol = PPP_IPV6CP;
440 f->callbacks = &ipv6cp_callbacks;
441 fsm_init(&ipv6cp_fsm[unit]);
443 memset(wo, 0, sizeof(*wo));
444 memset(ao, 0, sizeof(*ao));
446 wo->accept_local = 0;
453 wo->vj_protocol = IPV6CP_COMP;
457 * XXX This controls whether the user may use the defaultroute option.
459 ao->default_route = 1;
464 * ipv6cp_open - IPV6CP is allowed to come up.
470 fsm_open(&ipv6cp_fsm[unit]);
475 * ipv6cp_close - Take IPV6CP down.
478 ipv6cp_close(unit, reason)
482 fsm_close(&ipv6cp_fsm[unit], reason);
487 * ipv6cp_lowerup - The lower layer is up.
493 fsm_lowerup(&ipv6cp_fsm[unit]);
498 * ipv6cp_lowerdown - The lower layer is down.
501 ipv6cp_lowerdown(unit)
504 fsm_lowerdown(&ipv6cp_fsm[unit]);
509 * ipv6cp_input - Input IPV6CP packet.
512 ipv6cp_input(unit, p, len)
517 fsm_input(&ipv6cp_fsm[unit], p, len);
522 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP.
524 * Pretend the lower layer went down, so we shut up.
530 fsm_lowerdown(&ipv6cp_fsm[unit]);
535 * ipv6cp_resetci - Reset our CI.
541 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
542 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
544 wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid;
546 if (!wo->opt_local) {
547 wo->accept_local = 1;
548 eui64_magic_nz(wo->ourid);
552 eui64_zero(go->hisid); /* last proposed interface identifier */
557 * ipv6cp_cilen - Return length of our CI.
563 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
565 #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0)
566 #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0)
568 return (LENCIIFACEID(go->neg_ifaceid) +
569 LENCIVJ(go->neg_vj));
574 * ipv6cp_addci - Add our desired CIs to a packet.
577 ipv6cp_addci(f, ucp, lenp)
582 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
585 #define ADDCIVJ(opt, neg, val) \
587 int vjlen = CILEN_COMPRESS; \
588 if (len >= vjlen) { \
590 PUTCHAR(vjlen, ucp); \
591 PUTSHORT(val, ucp); \
597 #define ADDCIIFACEID(opt, neg, val1) \
599 int idlen = CILEN_IFACEID; \
600 if (len >= idlen) { \
602 PUTCHAR(idlen, ucp); \
603 eui64_put(val1, ucp); \
609 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
611 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
618 * ipv6cp_ackci - Ack our CIs.
625 ipv6cp_ackci(f, p, len)
630 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
631 u_short cilen, citype, cishort;
635 * CIs must be in exactly the same order that we sent...
636 * Check packet length and CI length at each step.
637 * If we find any deviations, then this packet is bad.
640 #define ACKCIVJ(opt, neg, val) \
642 int vjlen = CILEN_COMPRESS; \
643 if ((len -= vjlen) < 0) \
645 GETCHAR(citype, p); \
647 if (cilen != vjlen || \
650 GETSHORT(cishort, p); \
651 if (cishort != val) \
655 #define ACKCIIFACEID(opt, neg, val1) \
657 int idlen = CILEN_IFACEID; \
658 if ((len -= idlen) < 0) \
660 GETCHAR(citype, p); \
662 if (cilen != idlen || \
665 eui64_get(ifaceid, p); \
666 if (! eui64_equals(val1, ifaceid)) \
670 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
672 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
675 * If there are any remaining CIs, then this packet is bad.
682 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!"));
687 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs.
688 * This should not modify any state if the Nak is bad
689 * or if IPV6CP is in the OPENED state.
696 ipv6cp_nakci(f, p, len, treat_as_reject)
702 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
703 u_char citype, cilen, *next;
706 ipv6cp_options no; /* options we've seen Naks for */
707 ipv6cp_options try; /* options to request next time */
709 BZERO(&no, sizeof(no));
713 * Any Nak'd CIs must be in exactly the same order that we sent.
714 * Check packet length and CI length at each step.
715 * If we find any deviations, then this packet is bad.
717 #define NAKCIIFACEID(opt, neg, code) \
719 len >= (cilen = CILEN_IFACEID) && \
724 eui64_get(ifaceid, p); \
729 #define NAKCIVJ(opt, neg, code) \
731 ((cilen = p[1]) == CILEN_COMPRESS) && \
736 GETSHORT(cishort, p); \
742 * Accept the peer's idea of {our,his} interface identifier, if different
743 * from our idea, only if the accept_{local,remote} flag is set.
745 NAKCIIFACEID(CI_IFACEID, neg_ifaceid,
746 if (treat_as_reject) {
748 } else if (go->accept_local) {
749 while (eui64_iszero(ifaceid) ||
750 eui64_equals(ifaceid, go->hisid)) /* bad luck */
751 eui64_magic(ifaceid);
753 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid)));
758 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
760 if (cishort == IPV6CP_COMP && !treat_as_reject) {
761 try.vj_protocol = cishort;
768 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
776 * There may be remaining CIs, if the peer is requesting negotiation
777 * on an option that we didn't include in our request packet.
778 * If they want to negotiate about interface identifier, we comply.
779 * If they want us to ask for compression, we refuse.
781 while (len >= CILEN_VOID) {
784 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
786 next = p + cilen - 2;
789 case CI_COMPRESSTYPE:
790 if (go->neg_vj || no.neg_vj ||
791 (cilen != CILEN_COMPRESS))
796 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID)
799 eui64_get(ifaceid, p);
800 if (go->accept_local) {
801 while (eui64_iszero(ifaceid) ||
802 eui64_equals(ifaceid, go->hisid)) /* bad luck */
803 eui64_magic(ifaceid);
812 /* If there is still anything left, this packet is bad. */
817 * OK, the Nak is good. Now we can update state.
819 if (f->state != OPENED)
825 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!"));
831 * ipv6cp_rejci - Reject some of our CIs.
834 ipv6cp_rejci(f, p, len)
839 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
843 ipv6cp_options try; /* options to request next time */
847 * Any Rejected CIs must be in exactly the same order that we sent.
848 * Check packet length and CI length at each step.
849 * If we find any deviations, then this packet is bad.
851 #define REJCIIFACEID(opt, neg, val1) \
853 len >= (cilen = CILEN_IFACEID) && \
858 eui64_get(ifaceid, p); \
859 /* Check rejected value. */ \
860 if (! eui64_equals(ifaceid, val1)) \
865 #define REJCIVJ(opt, neg, val) \
867 p[1] == CILEN_COMPRESS && \
872 GETSHORT(cishort, p); \
873 /* Check rejected value. */ \
874 if (cishort != val) \
879 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid);
881 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol);
884 * If there are any remaining CIs, then this packet is bad.
889 * Now we can update state.
891 if (f->state != OPENED)
896 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!"));
902 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response.
904 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
905 * appropriately. If reject_if_disagree is non-zero, doesn't return
906 * CONFNAK; returns CONFREJ if it can't return CONFACK.
909 ipv6cp_reqci(f, inp, len, reject_if_disagree)
911 u_char *inp; /* Requested CIs */
912 int *len; /* Length of requested CIs */
913 int reject_if_disagree;
915 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
916 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
917 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit];
918 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
919 u_char *cip, *next; /* Pointer to current and next CIs */
920 u_short cilen, citype; /* Parsed len, type */
921 u_short cishort; /* Parsed short value */
922 eui64_t ifaceid; /* Parsed interface identifier */
923 int rc = CONFACK; /* Final packet return code */
924 int orc; /* Individual option return code */
925 u_char *p; /* Pointer to next char to parse */
926 u_char *ucp = inp; /* Pointer to current output char */
927 int l = *len; /* Length left */
930 * Reset all his options.
932 BZERO(ho, sizeof(*ho));
935 * Process all his options.
939 orc = CONFACK; /* Assume success */
940 cip = p = next; /* Remember begining of CI */
941 if (l < 2 || /* Not enough data for CI header or */
942 p[1] < 2 || /* CI length too small or */
943 p[1] > l) { /* CI length too big? */
944 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!"));
945 orc = CONFREJ; /* Reject bad CI */
946 cilen = l; /* Reject till end of packet */
947 l = 0; /* Don't loop again */
950 GETCHAR(citype, p); /* Parse CI type */
951 GETCHAR(cilen, p); /* Parse CI length */
952 l -= cilen; /* Adjust remaining length */
953 next += cilen; /* Step to next CI */
955 switch (citype) { /* Check CI type */
957 IPV6CPDEBUG(("ipv6cp: received interface identifier "));
959 if (!ao->neg_ifaceid ||
960 cilen != CILEN_IFACEID) { /* Check CI length */
961 orc = CONFREJ; /* Reject CI */
966 * If he has no interface identifier, or if we both have same
967 * identifier then NAK it with new idea.
968 * In particular, if we don't know his identifier, but he does,
971 eui64_get(ifaceid, p);
972 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid)));
973 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) {
974 orc = CONFREJ; /* Reject CI */
977 if (!eui64_iszero(wo->hisid) &&
978 !eui64_equals(ifaceid, wo->hisid) &&
979 eui64_iszero(go->hisid)) {
984 DECPTR(sizeof(ifaceid), p);
985 eui64_put(ifaceid, p);
987 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) {
989 if (eui64_iszero(go->hisid)) /* first time, try option */
991 while (eui64_iszero(ifaceid) ||
992 eui64_equals(ifaceid, go->ourid)) /* bad luck */
993 eui64_magic(ifaceid);
995 DECPTR(sizeof(ifaceid), p);
996 eui64_put(ifaceid, p);
1000 ho->hisid = ifaceid;
1003 case CI_COMPRESSTYPE:
1004 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE "));
1006 (cilen != CILEN_COMPRESS)) {
1010 GETSHORT(cishort, p);
1011 IPV6CPDEBUG(("(%d)", cishort));
1014 if (!(cishort == IPV6CP_COMP)) {
1020 ho->vj_protocol = cishort;
1033 IPV6CPDEBUG((" (%s)\n", CODENAME(orc)));
1035 if (orc == CONFACK && /* Good CI */
1036 rc != CONFACK) /* but prior CI wasnt? */
1037 continue; /* Don't send this one */
1039 if (orc == CONFNAK) { /* Nak this CI? */
1040 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1041 orc = CONFREJ; /* Get tough if so */
1043 if (rc == CONFREJ) /* Rejecting prior CI? */
1044 continue; /* Don't send this one */
1045 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1046 rc = CONFNAK; /* Not anymore... */
1047 ucp = inp; /* Backup */
1052 if (orc == CONFREJ && /* Reject this CI */
1053 rc != CONFREJ) { /* but no prior ones? */
1055 ucp = inp; /* Backup */
1058 /* Need to move CI? */
1060 BCOPY(cip, ucp, cilen); /* Move it */
1062 /* Update output pointer */
1067 * If we aren't rejecting this packet, and we want to negotiate
1068 * their identifier and they didn't send their identifier, then we
1069 * send a NAK with a CI_IFACEID option appended. We assume the
1070 * input buffer is long enough that we can append the extra
1073 if (rc != CONFREJ && !ho->neg_ifaceid &&
1074 wo->req_ifaceid && !reject_if_disagree) {
1075 if (rc == CONFACK) {
1077 ucp = inp; /* reset pointer */
1078 wo->req_ifaceid = 0; /* don't ask again */
1080 PUTCHAR(CI_IFACEID, ucp);
1081 PUTCHAR(CILEN_IFACEID, ucp);
1082 eui64_put(wo->hisid, ucp);
1085 *len = ucp - inp; /* Compute output length */
1086 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc)));
1087 return (rc); /* Return final code */
1092 * ipv6_check_options - check that any IP-related options are OK,
1093 * and assign appropriate defaults.
1096 ipv6_check_options()
1098 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
1100 if (!ipv6cp_protent.enabled_flag)
1104 * Persistent link-local id is only used when user has not explicitly
1105 * configure/hard-code the id
1107 if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) {
1110 * On systems where there are no Ethernet interfaces used, there
1111 * may be other ways to obtain a persistent id. Right now, it
1112 * will fall back to using magic [see eui64_magic] below when
1113 * an EUI-48 from MAC address can't be obtained. Other possibilities
1114 * include obtaining EEPROM serial numbers, or some other unique
1115 * yet persistent number. On Sparc platforms, this is possible,
1116 * but too bad there's no standards yet for x86 machines.
1118 if (ether_to_eui64(&wo->ourid)) {
1123 if (!wo->opt_local) { /* init interface identifier */
1124 if (wo->use_ip && eui64_iszero(wo->ourid)) {
1125 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr));
1126 if (!eui64_iszero(wo->ourid))
1130 while (eui64_iszero(wo->ourid))
1131 eui64_magic(wo->ourid);
1134 if (!wo->opt_remote) {
1135 if (wo->use_ip && eui64_iszero(wo->hisid)) {
1136 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr));
1137 if (!eui64_iszero(wo->hisid))
1142 if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) {
1143 option_error("local/remote LL address required for demand-dialling\n");
1144 exit(EXIT_OPTION_ERROR);
1150 * ipv6_demand_conf - configure the interface as though
1151 * IPV6CP were up, for use with dial-on-demand.
1157 ipv6cp_options *wo = &ipv6cp_wantoptions[u];
1161 if (!sif6addr(u, wo->ourid, wo->hisid))
1163 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1167 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE))
1169 if (wo->default_route)
1170 if (sif6defaultroute(u, wo->ourid, wo->hisid))
1171 default_route_set[u] = 1;
1173 notice("ipv6_demand_conf");
1174 notice("local LL address %s", llv6_ntoa(wo->ourid));
1175 notice("remote LL address %s", llv6_ntoa(wo->hisid));
1182 * ipv6cp_up - IPV6CP has come UP.
1184 * 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.
1313 IPV6CPDEBUG(("ipv6cp: down"));
1314 update_link_stats(f->unit);
1315 notify(ipv6_down_notifier, 0);
1320 np_down(f->unit, PPP_IPV6);
1323 sif6comp(f->unit, 0);
1327 * If we are doing dial-on-demand, set the interface
1328 * to queue up outgoing packets (for now).
1331 sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE);
1333 sifnpmode(f->unit, PPP_IPV6, NPMODE_DROP);
1334 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC)))
1337 ipv6cp_clear_addrs(f->unit,
1338 ipv6cp_gotoptions[f->unit].ourid,
1339 ipv6cp_hisoptions[f->unit].hisid);
1340 #if defined(__linux__)
1342 #elif defined(SVR4) && (defined(SNI) || defined(__USLC))
1347 /* Execute the ipv6-down script */
1348 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) {
1349 ipv6cp_script_state = s_down;
1350 ipv6cp_script(_PATH_IPV6DOWN);
1356 * ipv6cp_clear_addrs() - clear the interface addresses, routes,
1357 * proxy neighbour discovery entries, etc.
1360 ipv6cp_clear_addrs(unit, ourid, hisid)
1365 cif6addr(unit, ourid, hisid);
1370 * ipv6cp_finished - possibly shut down the lower layers.
1376 np_finished(f->unit, PPP_IPV6);
1381 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script
1385 ipv6cp_script_done(arg)
1388 ipv6cp_script_pid = 0;
1389 switch (ipv6cp_script_state) {
1391 if (ipv6cp_fsm[0].state != OPENED) {
1392 ipv6cp_script_state = s_down;
1393 ipv6cp_script(_PATH_IPV6DOWN);
1397 if (ipv6cp_fsm[0].state == OPENED) {
1398 ipv6cp_script_state = s_up;
1399 ipv6cp_script(_PATH_IPV6UP);
1407 * ipv6cp_script - Execute a script with arguments
1408 * interface-name tty-name speed local-LL remote-LL.
1411 ipv6cp_script(script)
1414 char strspeed[32], strlocal[32], strremote[32];
1417 sprintf(strspeed, "%d", baud_rate);
1418 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid));
1419 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid));
1426 argv[5] = strremote;
1430 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done,
1435 * ipv6cp_printpkt - print the contents of an IPV6CP packet.
1437 static char *ipv6cp_codenames[] = {
1438 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1439 "TermReq", "TermAck", "CodeRej"
1443 ipv6cp_printpkt(p, plen, printer, arg)
1446 void (*printer) __P((void *, char *, ...));
1449 int code, id, len, olen;
1450 u_char *pstart, *optend;
1454 if (plen < HEADERLEN)
1460 if (len < HEADERLEN || len > plen)
1463 if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *))
1464 printer(arg, " %s", ipv6cp_codenames[code-1]);
1466 printer(arg, " code=0x%x", code);
1467 printer(arg, " id=0x%x", id);
1474 /* print option list */
1479 if (olen < 2 || olen > len) {
1486 case CI_COMPRESSTYPE:
1487 if (olen >= CILEN_COMPRESS) {
1489 GETSHORT(cishort, p);
1490 printer(arg, "compress ");
1491 printer(arg, "0x%x", cishort);
1495 if (olen == CILEN_IFACEID) {
1497 eui64_get(ifaceid, p);
1498 printer(arg, "addr %s", llv6_ntoa(ifaceid));
1502 while (p < optend) {
1504 printer(arg, " %.2x", code);
1512 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1514 print_string((char *)p, len, printer, arg);
1521 /* print the rest of the bytes in the packet */
1522 for (; len > 0; --len) {
1524 printer(arg, " %.2x", code);
1531 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for.
1532 * We don't bring the link up for IP fragments or for TCP FIN packets
1535 #define IP6_HDRLEN 40 /* bytes */
1536 #define IP6_NHDR_FRAG 44 /* fragment IPv6 header */
1537 #define TCP_HDRLEN 20
1541 * We use these macros because the IP header may be at an odd address,
1542 * and some compilers might use word loads to get th_off or ip_hl.
1545 #define get_ip6nh(x) (((unsigned char *)(x))[6])
1546 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1547 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1550 ipv6_active_pkt(pkt, len)
1558 if (len < IP6_HDRLEN)
1560 if (get_ip6nh(pkt) == IP6_NHDR_FRAG)
1562 if (get_ip6nh(pkt) != IPPROTO_TCP)
1564 if (len < IP6_HDRLEN + TCP_HDRLEN)
1566 tcp = pkt + IP6_HDRLEN;
1567 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4)