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 = 1;
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 eui64_magic_nz(wo->ourid);
551 eui64_zero(go->hisid); /* last proposed interface identifier */
556 * ipv6cp_cilen - Return length of our CI.
562 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
564 #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0)
565 #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0)
567 return (LENCIIFACEID(go->neg_ifaceid) +
568 LENCIVJ(go->neg_vj));
573 * ipv6cp_addci - Add our desired CIs to a packet.
576 ipv6cp_addci(f, ucp, lenp)
581 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
584 #define ADDCIVJ(opt, neg, val) \
586 int vjlen = CILEN_COMPRESS; \
587 if (len >= vjlen) { \
589 PUTCHAR(vjlen, ucp); \
590 PUTSHORT(val, ucp); \
596 #define ADDCIIFACEID(opt, neg, val1) \
598 int idlen = CILEN_IFACEID; \
599 if (len >= idlen) { \
601 PUTCHAR(idlen, ucp); \
602 eui64_put(val1, ucp); \
608 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
610 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
617 * ipv6cp_ackci - Ack our CIs.
624 ipv6cp_ackci(f, p, len)
629 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
630 u_short cilen, citype, cishort;
634 * CIs must be in exactly the same order that we sent...
635 * Check packet length and CI length at each step.
636 * If we find any deviations, then this packet is bad.
639 #define ACKCIVJ(opt, neg, val) \
641 int vjlen = CILEN_COMPRESS; \
642 if ((len -= vjlen) < 0) \
644 GETCHAR(citype, p); \
646 if (cilen != vjlen || \
649 GETSHORT(cishort, p); \
650 if (cishort != val) \
654 #define ACKCIIFACEID(opt, neg, val1) \
656 int idlen = CILEN_IFACEID; \
657 if ((len -= idlen) < 0) \
659 GETCHAR(citype, p); \
661 if (cilen != idlen || \
664 eui64_get(ifaceid, p); \
665 if (! eui64_equals(val1, ifaceid)) \
669 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
671 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
674 * If there are any remaining CIs, then this packet is bad.
681 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!"));
686 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs.
687 * This should not modify any state if the Nak is bad
688 * or if IPV6CP is in the OPENED state.
695 ipv6cp_nakci(f, p, len, treat_as_reject)
701 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
702 u_char citype, cilen, *next;
705 ipv6cp_options no; /* options we've seen Naks for */
706 ipv6cp_options try; /* options to request next time */
708 BZERO(&no, sizeof(no));
712 * Any Nak'd CIs must be in exactly the same order that we sent.
713 * Check packet length and CI length at each step.
714 * If we find any deviations, then this packet is bad.
716 #define NAKCIIFACEID(opt, neg, code) \
718 len >= (cilen = CILEN_IFACEID) && \
723 eui64_get(ifaceid, p); \
728 #define NAKCIVJ(opt, neg, code) \
730 ((cilen = p[1]) == CILEN_COMPRESS) && \
735 GETSHORT(cishort, p); \
741 * Accept the peer's idea of {our,his} interface identifier, if different
742 * from our idea, only if the accept_{local,remote} flag is set.
744 NAKCIIFACEID(CI_IFACEID, neg_ifaceid,
745 if (treat_as_reject) {
747 } else if (go->accept_local) {
748 while (eui64_iszero(ifaceid) ||
749 eui64_equals(ifaceid, go->hisid)) /* bad luck */
750 eui64_magic(ifaceid);
752 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid)));
757 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
759 if (cishort == IPV6CP_COMP && !treat_as_reject) {
760 try.vj_protocol = cishort;
767 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
775 * There may be remaining CIs, if the peer is requesting negotiation
776 * on an option that we didn't include in our request packet.
777 * If they want to negotiate about interface identifier, we comply.
778 * If they want us to ask for compression, we refuse.
780 while (len >= CILEN_VOID) {
783 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
785 next = p + cilen - 2;
788 case CI_COMPRESSTYPE:
789 if (go->neg_vj || no.neg_vj ||
790 (cilen != CILEN_COMPRESS))
795 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID)
798 eui64_get(ifaceid, p);
799 if (go->accept_local) {
800 while (eui64_iszero(ifaceid) ||
801 eui64_equals(ifaceid, go->hisid)) /* bad luck */
802 eui64_magic(ifaceid);
811 /* If there is still anything left, this packet is bad. */
816 * OK, the Nak is good. Now we can update state.
818 if (f->state != OPENED)
824 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!"));
830 * ipv6cp_rejci - Reject some of our CIs.
833 ipv6cp_rejci(f, p, len)
838 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
842 ipv6cp_options try; /* options to request next time */
846 * Any Rejected CIs must be in exactly the same order that we sent.
847 * Check packet length and CI length at each step.
848 * If we find any deviations, then this packet is bad.
850 #define REJCIIFACEID(opt, neg, val1) \
852 len >= (cilen = CILEN_IFACEID) && \
857 eui64_get(ifaceid, p); \
858 /* Check rejected value. */ \
859 if (! eui64_equals(ifaceid, val1)) \
864 #define REJCIVJ(opt, neg, val) \
866 p[1] == CILEN_COMPRESS && \
871 GETSHORT(cishort, p); \
872 /* Check rejected value. */ \
873 if (cishort != val) \
878 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid);
880 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol);
883 * If there are any remaining CIs, then this packet is bad.
888 * Now we can update state.
890 if (f->state != OPENED)
895 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!"));
901 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response.
903 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
904 * appropriately. If reject_if_disagree is non-zero, doesn't return
905 * CONFNAK; returns CONFREJ if it can't return CONFACK.
908 ipv6cp_reqci(f, inp, len, reject_if_disagree)
910 u_char *inp; /* Requested CIs */
911 int *len; /* Length of requested CIs */
912 int reject_if_disagree;
914 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
915 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
916 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit];
917 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
918 u_char *cip, *next; /* Pointer to current and next CIs */
919 u_short cilen, citype; /* Parsed len, type */
920 u_short cishort; /* Parsed short value */
921 eui64_t ifaceid; /* Parsed interface identifier */
922 int rc = CONFACK; /* Final packet return code */
923 int orc; /* Individual option return code */
924 u_char *p; /* Pointer to next char to parse */
925 u_char *ucp = inp; /* Pointer to current output char */
926 int l = *len; /* Length left */
929 * Reset all his options.
931 BZERO(ho, sizeof(*ho));
934 * Process all his options.
938 orc = CONFACK; /* Assume success */
939 cip = p = next; /* Remember begining of CI */
940 if (l < 2 || /* Not enough data for CI header or */
941 p[1] < 2 || /* CI length too small or */
942 p[1] > l) { /* CI length too big? */
943 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!"));
944 orc = CONFREJ; /* Reject bad CI */
945 cilen = l; /* Reject till end of packet */
946 l = 0; /* Don't loop again */
949 GETCHAR(citype, p); /* Parse CI type */
950 GETCHAR(cilen, p); /* Parse CI length */
951 l -= cilen; /* Adjust remaining length */
952 next += cilen; /* Step to next CI */
954 switch (citype) { /* Check CI type */
956 IPV6CPDEBUG(("ipv6cp: received interface identifier "));
958 if (!ao->neg_ifaceid ||
959 cilen != CILEN_IFACEID) { /* Check CI length */
960 orc = CONFREJ; /* Reject CI */
965 * If he has no interface identifier, or if we both have same
966 * identifier then NAK it with new idea.
967 * In particular, if we don't know his identifier, but he does,
970 eui64_get(ifaceid, p);
971 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid)));
972 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) {
973 orc = CONFREJ; /* Reject CI */
976 if (!eui64_iszero(wo->hisid) &&
977 !eui64_equals(ifaceid, wo->hisid) &&
978 eui64_iszero(go->hisid)) {
983 DECPTR(sizeof(ifaceid), p);
984 eui64_put(ifaceid, p);
986 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) {
988 if (eui64_iszero(go->hisid)) /* first time, try option */
990 while (eui64_iszero(ifaceid) ||
991 eui64_equals(ifaceid, go->ourid)) /* bad luck */
992 eui64_magic(ifaceid);
994 DECPTR(sizeof(ifaceid), p);
995 eui64_put(ifaceid, p);
1002 case CI_COMPRESSTYPE:
1003 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE "));
1005 (cilen != CILEN_COMPRESS)) {
1009 GETSHORT(cishort, p);
1010 IPV6CPDEBUG(("(%d)", cishort));
1013 if (!(cishort == IPV6CP_COMP)) {
1019 ho->vj_protocol = cishort;
1032 IPV6CPDEBUG((" (%s)\n", CODENAME(orc)));
1034 if (orc == CONFACK && /* Good CI */
1035 rc != CONFACK) /* but prior CI wasnt? */
1036 continue; /* Don't send this one */
1038 if (orc == CONFNAK) { /* Nak this CI? */
1039 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1040 orc = CONFREJ; /* Get tough if so */
1042 if (rc == CONFREJ) /* Rejecting prior CI? */
1043 continue; /* Don't send this one */
1044 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1045 rc = CONFNAK; /* Not anymore... */
1046 ucp = inp; /* Backup */
1051 if (orc == CONFREJ && /* Reject this CI */
1052 rc != CONFREJ) { /* but no prior ones? */
1054 ucp = inp; /* Backup */
1057 /* Need to move CI? */
1059 BCOPY(cip, ucp, cilen); /* Move it */
1061 /* Update output pointer */
1066 * If we aren't rejecting this packet, and we want to negotiate
1067 * their identifier and they didn't send their identifier, then we
1068 * send a NAK with a CI_IFACEID option appended. We assume the
1069 * input buffer is long enough that we can append the extra
1072 if (rc != CONFREJ && !ho->neg_ifaceid &&
1073 wo->req_ifaceid && !reject_if_disagree) {
1074 if (rc == CONFACK) {
1076 ucp = inp; /* reset pointer */
1077 wo->req_ifaceid = 0; /* don't ask again */
1079 PUTCHAR(CI_IFACEID, ucp);
1080 PUTCHAR(CILEN_IFACEID, ucp);
1081 eui64_put(wo->hisid, ucp);
1084 *len = ucp - inp; /* Compute output length */
1085 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc)));
1086 return (rc); /* Return final code */
1091 * ipv6_check_options - check that any IP-related options are OK,
1092 * and assign appropriate defaults.
1095 ipv6_check_options()
1097 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
1099 if (!ipv6cp_protent.enabled_flag)
1103 * Persistent link-local id is only used when user has not explicitly
1104 * configure/hard-code the id
1106 if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) {
1109 * On systems where there are no Ethernet interfaces used, there
1110 * may be other ways to obtain a persistent id. Right now, it
1111 * will fall back to using magic [see eui64_magic] below when
1112 * an EUI-48 from MAC address can't be obtained. Other possibilities
1113 * include obtaining EEPROM serial numbers, or some other unique
1114 * yet persistent number. On Sparc platforms, this is possible,
1115 * but too bad there's no standards yet for x86 machines.
1117 if (ether_to_eui64(&wo->ourid)) {
1122 if (!wo->opt_local) { /* init interface identifier */
1123 if (wo->use_ip && eui64_iszero(wo->ourid)) {
1124 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr));
1125 if (!eui64_iszero(wo->ourid))
1129 while (eui64_iszero(wo->ourid))
1130 eui64_magic(wo->ourid);
1133 if (!wo->opt_remote) {
1134 if (wo->use_ip && eui64_iszero(wo->hisid)) {
1135 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr));
1136 if (!eui64_iszero(wo->hisid))
1141 if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) {
1142 option_error("local/remote LL address required for demand-dialling\n");
1143 exit(EXIT_OPTION_ERROR);
1149 * ipv6_demand_conf - configure the interface as though
1150 * IPV6CP were up, for use with dial-on-demand.
1156 ipv6cp_options *wo = &ipv6cp_wantoptions[u];
1160 if (!sif6addr(u, wo->ourid, wo->hisid))
1162 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1166 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE))
1168 if (wo->default_route)
1169 if (sif6defaultroute(u, wo->ourid, wo->hisid))
1170 default_route_set[u] = 1;
1172 notice("ipv6_demand_conf");
1173 notice("local LL address %s", llv6_ntoa(wo->ourid));
1174 notice("remote LL address %s", llv6_ntoa(wo->hisid));
1181 * ipv6cp_up - IPV6CP has come UP.
1183 * Configure the IPv6 network interface appropriately and bring it up.
1189 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
1190 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
1191 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
1193 IPV6CPDEBUG(("ipv6cp: up"));
1196 * We must have a non-zero LL address for both ends of the link.
1198 if (!ho->neg_ifaceid)
1199 ho->hisid = wo->hisid;
1201 if(!no_ifaceid_neg) {
1202 if (eui64_iszero(ho->hisid)) {
1203 error("Could not determine remote LL address");
1204 ipv6cp_close(f->unit, "Could not determine remote LL address");
1207 if (eui64_iszero(go->ourid)) {
1208 error("Could not determine local LL address");
1209 ipv6cp_close(f->unit, "Could not determine local LL address");
1212 if (eui64_equals(go->ourid, ho->hisid)) {
1213 error("local and remote LL addresses are equal");
1214 ipv6cp_close(f->unit, "local and remote LL addresses are equal");
1218 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0);
1219 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0);
1222 /* set tcp compression */
1223 sif6comp(f->unit, ho->neg_vj);
1227 * If we are doing dial-on-demand, the interface is already
1228 * configured, so we put out any saved-up packets, then set the
1229 * interface to pass IPv6 packets.
1232 if (! eui64_equals(go->ourid, wo->ourid) ||
1233 ! eui64_equals(ho->hisid, wo->hisid)) {
1234 if (! eui64_equals(go->ourid, wo->ourid))
1235 warn("Local LL address changed to %s",
1236 llv6_ntoa(go->ourid));
1237 if (! eui64_equals(ho->hisid, wo->hisid))
1238 warn("Remote LL address changed to %s",
1239 llv6_ntoa(ho->hisid));
1240 ipv6cp_clear_addrs(f->unit, go->ourid, ho->hisid);
1242 /* Set the interface to the new addresses */
1243 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1245 warn("sif6addr failed");
1246 ipv6cp_close(f->unit, "Interface configuration failed");
1250 /* assign a default route through the interface if required */
1251 if (ipv6cp_wantoptions[f->unit].default_route)
1252 if (sif6defaultroute(f->unit, go->ourid, ho->hisid))
1253 default_route_set[f->unit] = 1;
1255 demand_rexmit(PPP_IPV6);
1256 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1259 /* bring the interface up for IPv6 */
1260 if (!sif6up(f->unit)) {
1262 warn("sif6up failed (IPV6)");
1263 ipv6cp_close(f->unit, "Interface configuration failed");
1267 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1269 warn("sif6addr failed");
1270 ipv6cp_close(f->unit, "Interface configuration failed");
1273 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1275 /* assign a default route through the interface if required */
1276 if (ipv6cp_wantoptions[f->unit].default_route)
1277 if (sif6defaultroute(f->unit, go->ourid, ho->hisid))
1278 default_route_set[f->unit] = 1;
1280 notice("local LL address %s", llv6_ntoa(go->ourid));
1281 notice("remote LL address %s", llv6_ntoa(ho->hisid));
1284 np_up(f->unit, PPP_IPV6);
1287 notify(ipv6_up_notifier, 0);
1292 * Execute the ipv6-up script, like this:
1293 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL
1295 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) {
1296 ipv6cp_script_state = s_up;
1297 ipv6cp_script(_PATH_IPV6UP);
1303 * ipv6cp_down - IPV6CP has gone DOWN.
1305 * Take the IPv6 network interface down, clear its addresses
1306 * 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(unit, ourid, hisid)
1364 cif6addr(unit, ourid, hisid);
1369 * ipv6cp_finished - possibly shut down the lower layers.
1375 np_finished(f->unit, PPP_IPV6);
1380 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script
1384 ipv6cp_script_done(arg)
1387 ipv6cp_script_pid = 0;
1388 switch (ipv6cp_script_state) {
1390 if (ipv6cp_fsm[0].state != OPENED) {
1391 ipv6cp_script_state = s_down;
1392 ipv6cp_script(_PATH_IPV6DOWN);
1396 if (ipv6cp_fsm[0].state == OPENED) {
1397 ipv6cp_script_state = s_up;
1398 ipv6cp_script(_PATH_IPV6UP);
1406 * ipv6cp_script - Execute a script with arguments
1407 * interface-name tty-name speed local-LL remote-LL.
1410 ipv6cp_script(script)
1413 char strspeed[32], strlocal[32], strremote[32];
1416 sprintf(strspeed, "%d", baud_rate);
1417 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid));
1418 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid));
1425 argv[5] = strremote;
1429 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done,
1434 * ipv6cp_printpkt - print the contents of an IPV6CP packet.
1436 static char *ipv6cp_codenames[] = {
1437 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1438 "TermReq", "TermAck", "CodeRej"
1442 ipv6cp_printpkt(p, plen, printer, arg)
1445 void (*printer) __P((void *, char *, ...));
1448 int code, id, len, olen;
1449 u_char *pstart, *optend;
1453 if (plen < HEADERLEN)
1459 if (len < HEADERLEN || len > plen)
1462 if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *))
1463 printer(arg, " %s", ipv6cp_codenames[code-1]);
1465 printer(arg, " code=0x%x", code);
1466 printer(arg, " id=0x%x", id);
1473 /* print option list */
1478 if (olen < 2 || olen > len) {
1485 case CI_COMPRESSTYPE:
1486 if (olen >= CILEN_COMPRESS) {
1488 GETSHORT(cishort, p);
1489 printer(arg, "compress ");
1490 printer(arg, "0x%x", cishort);
1494 if (olen == CILEN_IFACEID) {
1496 eui64_get(ifaceid, p);
1497 printer(arg, "addr %s", llv6_ntoa(ifaceid));
1501 while (p < optend) {
1503 printer(arg, " %.2x", code);
1511 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1513 print_string((char *)p, len, printer, arg);
1520 /* print the rest of the bytes in the packet */
1521 for (; len > 0; --len) {
1523 printer(arg, " %.2x", code);
1530 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for.
1531 * We don't bring the link up for IP fragments or for TCP FIN packets
1534 #define IP6_HDRLEN 40 /* bytes */
1535 #define IP6_NHDR_FRAG 44 /* fragment IPv6 header */
1536 #define TCP_HDRLEN 20
1540 * We use these macros because the IP header may be at an odd address,
1541 * and some compilers might use word loads to get th_off or ip_hl.
1544 #define get_ip6nh(x) (((unsigned char *)(x))[6])
1545 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1546 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1549 ipv6_active_pkt(pkt, len)
1557 if (len < IP6_HDRLEN)
1559 if (get_ip6nh(pkt) == IP6_NHDR_FRAG)
1561 if (get_ip6nh(pkt) != IPPROTO_TCP)
1563 if (len < IP6_HDRLEN + TCP_HDRLEN)
1565 tcp = pkt + IP6_HDRLEN;
1566 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4)