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"
171 static const char rcsid[] = RCSID;
174 ipv6cp_options ipv6cp_wantoptions[NUM_PPP]; /* Options that we want to request */
175 ipv6cp_options ipv6cp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
176 ipv6cp_options ipv6cp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
177 ipv6cp_options ipv6cp_hisoptions[NUM_PPP]; /* Options that we ack'd */
178 int no_ifaceid_neg = 0;
181 static int 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 { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip,
250 "Use (default) IPv4 address as interface identifier", 1 },
252 #if defined(SOL2) || defined(__linux__)
253 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent,
254 "Use uniquely-available persistent value for link local address", 1 },
255 #endif /* defined(SOL2) */
257 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime,
258 "Set timeout for IPv6CP", OPT_PRIO },
259 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits,
260 "Set max #xmits for term-reqs", OPT_PRIO },
261 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits,
262 "Set max #xmits for conf-reqs", OPT_PRIO },
263 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops,
264 "Set max #conf-naks for IPv6CP", OPT_PRIO },
271 * Protocol entry points from main code.
273 static void ipv6cp_init __P((int));
274 static void ipv6cp_open __P((int));
275 static void ipv6cp_close __P((int, char *));
276 static void ipv6cp_lowerup __P((int));
277 static void ipv6cp_lowerdown __P((int));
278 static void ipv6cp_input __P((int, u_char *, int));
279 static void ipv6cp_protrej __P((int));
280 static int ipv6cp_printpkt __P((u_char *, int,
281 void (*) __P((void *, char *, ...)), void *));
282 static void ipv6_check_options __P((void));
283 static int ipv6_demand_conf __P((int));
284 static int ipv6_active_pkt __P((u_char *, int));
286 struct protent ipv6cp_protent = {
306 static void ipv6cp_clear_addrs __P((int, eui64_t, eui64_t));
307 static void ipv6cp_script __P((char *));
308 static void ipv6cp_script_done __P((void *));
311 * Lengths of configuration options.
314 #define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */
315 #define CILEN_IFACEID 10 /* RFC2472, interface identifier */
317 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
318 (x) == CONFNAK ? "NAK" : "REJ")
321 * This state variable is used to ensure that we don't
322 * run an ipcp-up/down script while one is already running.
324 static enum script_state {
327 } ipv6cp_script_state;
328 static pid_t ipv6cp_script_pid;
331 * setifaceid - set the interface identifiers manually
337 char *comma, *arg, c;
338 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
339 struct in6_addr addr;
340 static int prio_local, prio_remote;
342 #define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \
343 (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) )
346 if ((comma = strchr(arg, ',')) == NULL)
347 comma = arg + strlen(arg);
350 * If comma first character, then no local identifier
356 if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) {
357 option_error("Illegal interface identifier (local): %s", arg);
361 if (option_priority >= prio_local) {
362 eui64_copy(addr.s6_addr32[2], wo->ourid);
364 prio_local = option_priority;
370 * If comma last character, the no remote identifier
372 if (*comma != 0 && *++comma != '\0') {
373 if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) {
374 option_error("Illegal interface identifier (remote): %s", comma);
377 if (option_priority >= prio_remote) {
378 eui64_copy(addr.s6_addr32[2], wo->hisid);
380 prio_remote = option_priority;
384 if (override_value("+ipv6", option_priority, option_source))
385 ipv6cp_protent.enabled_flag = 1;
389 char *llv6_ntoa(eui64_t ifaceid);
392 printifaceid(opt, printer, arg)
394 void (*printer) __P((void *, char *, ...));
397 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
400 printer(arg, "%s", llv6_ntoa(wo->ourid));
403 printer(arg, "%s", llv6_ntoa(wo->hisid));
407 * Make a string representation of a network address.
415 sprintf(b, "fe80::%s", eui64_ntoa(ifaceid));
421 * ipv6cp_init - Initialize IPV6CP.
427 fsm *f = &ipv6cp_fsm[unit];
428 ipv6cp_options *wo = &ipv6cp_wantoptions[unit];
429 ipv6cp_options *ao = &ipv6cp_allowoptions[unit];
432 f->protocol = PPP_IPV6CP;
433 f->callbacks = &ipv6cp_callbacks;
434 fsm_init(&ipv6cp_fsm[unit]);
436 memset(wo, 0, sizeof(*wo));
437 memset(ao, 0, sizeof(*ao));
439 wo->accept_local = 1;
446 wo->vj_protocol = IPV6CP_COMP;
453 * ipv6cp_open - IPV6CP is allowed to come up.
459 fsm_open(&ipv6cp_fsm[unit]);
464 * ipv6cp_close - Take IPV6CP down.
467 ipv6cp_close(unit, reason)
471 fsm_close(&ipv6cp_fsm[unit], reason);
476 * ipv6cp_lowerup - The lower layer is up.
482 fsm_lowerup(&ipv6cp_fsm[unit]);
487 * ipv6cp_lowerdown - The lower layer is down.
490 ipv6cp_lowerdown(unit)
493 fsm_lowerdown(&ipv6cp_fsm[unit]);
498 * ipv6cp_input - Input IPV6CP packet.
501 ipv6cp_input(unit, p, len)
506 fsm_input(&ipv6cp_fsm[unit], p, len);
511 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP.
513 * Pretend the lower layer went down, so we shut up.
519 fsm_lowerdown(&ipv6cp_fsm[unit]);
524 * ipv6cp_resetci - Reset our CI.
530 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
531 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
533 wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid;
535 if (!wo->opt_local) {
536 eui64_magic_nz(wo->ourid);
540 eui64_zero(go->hisid); /* last proposed interface identifier */
545 * ipv6cp_cilen - Return length of our CI.
551 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
553 #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0)
554 #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0)
556 return (LENCIIFACEID(go->neg_ifaceid) +
557 LENCIVJ(go->neg_vj));
562 * ipv6cp_addci - Add our desired CIs to a packet.
565 ipv6cp_addci(f, ucp, lenp)
570 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
573 #define ADDCIVJ(opt, neg, val) \
575 int vjlen = CILEN_COMPRESS; \
576 if (len >= vjlen) { \
578 PUTCHAR(vjlen, ucp); \
579 PUTSHORT(val, ucp); \
585 #define ADDCIIFACEID(opt, neg, val1) \
587 int idlen = CILEN_IFACEID; \
588 if (len >= idlen) { \
590 PUTCHAR(idlen, ucp); \
591 eui64_put(val1, ucp); \
597 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
599 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
606 * ipv6cp_ackci - Ack our CIs.
613 ipv6cp_ackci(f, p, len)
618 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
619 u_short cilen, citype, cishort;
623 * CIs must be in exactly the same order that we sent...
624 * Check packet length and CI length at each step.
625 * If we find any deviations, then this packet is bad.
628 #define ACKCIVJ(opt, neg, val) \
630 int vjlen = CILEN_COMPRESS; \
631 if ((len -= vjlen) < 0) \
633 GETCHAR(citype, p); \
635 if (cilen != vjlen || \
638 GETSHORT(cishort, p); \
639 if (cishort != val) \
643 #define ACKCIIFACEID(opt, neg, val1) \
645 int idlen = CILEN_IFACEID; \
646 if ((len -= idlen) < 0) \
648 GETCHAR(citype, p); \
650 if (cilen != idlen || \
653 eui64_get(ifaceid, p); \
654 if (! eui64_equals(val1, ifaceid)) \
658 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
660 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
663 * If there are any remaining CIs, then this packet is bad.
670 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!"));
675 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs.
676 * This should not modify any state if the Nak is bad
677 * or if IPV6CP is in the OPENED state.
684 ipv6cp_nakci(f, p, len, treat_as_reject)
690 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
691 u_char citype, cilen, *next;
694 ipv6cp_options no; /* options we've seen Naks for */
695 ipv6cp_options try; /* options to request next time */
697 BZERO(&no, sizeof(no));
701 * Any Nak'd CIs must be in exactly the same order that we sent.
702 * Check packet length and CI length at each step.
703 * If we find any deviations, then this packet is bad.
705 #define NAKCIIFACEID(opt, neg, code) \
707 len >= (cilen = CILEN_IFACEID) && \
712 eui64_get(ifaceid, p); \
717 #define NAKCIVJ(opt, neg, code) \
719 ((cilen = p[1]) == CILEN_COMPRESS) && \
724 GETSHORT(cishort, p); \
730 * Accept the peer's idea of {our,his} interface identifier, if different
731 * from our idea, only if the accept_{local,remote} flag is set.
733 NAKCIIFACEID(CI_IFACEID, neg_ifaceid,
734 if (treat_as_reject) {
736 } else if (go->accept_local) {
737 while (eui64_iszero(ifaceid) ||
738 eui64_equals(ifaceid, go->hisid)) /* bad luck */
739 eui64_magic(ifaceid);
741 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid)));
746 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
748 if (cishort == IPV6CP_COMP && !treat_as_reject) {
749 try.vj_protocol = cishort;
756 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
764 * There may be remaining CIs, if the peer is requesting negotiation
765 * on an option that we didn't include in our request packet.
766 * If they want to negotiate about interface identifier, we comply.
767 * If they want us to ask for compression, we refuse.
769 while (len >= CILEN_VOID) {
772 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
774 next = p + cilen - 2;
777 case CI_COMPRESSTYPE:
778 if (go->neg_vj || no.neg_vj ||
779 (cilen != CILEN_COMPRESS))
784 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID)
787 eui64_get(ifaceid, p);
788 if (go->accept_local) {
789 while (eui64_iszero(ifaceid) ||
790 eui64_equals(ifaceid, go->hisid)) /* bad luck */
791 eui64_magic(ifaceid);
800 /* If there is still anything left, this packet is bad. */
805 * OK, the Nak is good. Now we can update state.
807 if (f->state != OPENED)
813 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!"));
819 * ipv6cp_rejci - Reject some of our CIs.
822 ipv6cp_rejci(f, p, 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(f, inp, len, reject_if_disagree)
899 u_char *inp; /* Requested CIs */
900 int *len; /* Length of requested CIs */
901 int reject_if_disagree;
903 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
904 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
905 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit];
906 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
907 u_char *cip, *next; /* Pointer to current and next CIs */
908 u_short cilen, citype; /* Parsed len, type */
909 u_short cishort; /* Parsed short value */
910 eui64_t ifaceid; /* Parsed interface identifier */
911 int rc = CONFACK; /* Final packet return code */
912 int orc; /* Individual option return code */
913 u_char *p; /* Pointer to next char to parse */
914 u_char *ucp = inp; /* Pointer to current output char */
915 int l = *len; /* Length left */
918 * Reset all his options.
920 BZERO(ho, sizeof(*ho));
923 * Process all his options.
927 orc = CONFACK; /* Assume success */
928 cip = p = next; /* Remember begining of CI */
929 if (l < 2 || /* Not enough data for CI header or */
930 p[1] < 2 || /* CI length too small or */
931 p[1] > l) { /* CI length too big? */
932 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!"));
933 orc = CONFREJ; /* Reject bad CI */
934 cilen = l; /* Reject till end of packet */
935 l = 0; /* Don't loop again */
938 GETCHAR(citype, p); /* Parse CI type */
939 GETCHAR(cilen, p); /* Parse CI length */
940 l -= cilen; /* Adjust remaining length */
941 next += cilen; /* Step to next CI */
943 switch (citype) { /* Check CI type */
945 IPV6CPDEBUG(("ipv6cp: received interface identifier "));
947 if (!ao->neg_ifaceid ||
948 cilen != CILEN_IFACEID) { /* Check CI length */
949 orc = CONFREJ; /* Reject CI */
954 * If he has no interface identifier, or if we both have same
955 * identifier then NAK it with new idea.
956 * In particular, if we don't know his identifier, but he does,
959 eui64_get(ifaceid, p);
960 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid)));
961 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) {
962 orc = CONFREJ; /* Reject CI */
965 if (!eui64_iszero(wo->hisid) &&
966 !eui64_equals(ifaceid, wo->hisid) &&
967 eui64_iszero(go->hisid)) {
972 DECPTR(sizeof(ifaceid), p);
973 eui64_put(ifaceid, p);
975 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) {
977 if (eui64_iszero(go->hisid)) /* first time, try option */
979 while (eui64_iszero(ifaceid) ||
980 eui64_equals(ifaceid, go->ourid)) /* bad luck */
981 eui64_magic(ifaceid);
983 DECPTR(sizeof(ifaceid), p);
984 eui64_put(ifaceid, p);
991 case CI_COMPRESSTYPE:
992 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE "));
994 (cilen != CILEN_COMPRESS)) {
998 GETSHORT(cishort, p);
999 IPV6CPDEBUG(("(%d)", cishort));
1002 if (!(cishort == IPV6CP_COMP)) {
1008 ho->vj_protocol = cishort;
1021 IPV6CPDEBUG((" (%s)\n", CODENAME(orc)));
1023 if (orc == CONFACK && /* Good CI */
1024 rc != CONFACK) /* but prior CI wasnt? */
1025 continue; /* Don't send this one */
1027 if (orc == CONFNAK) { /* Nak this CI? */
1028 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1029 orc = CONFREJ; /* Get tough if so */
1031 if (rc == CONFREJ) /* Rejecting prior CI? */
1032 continue; /* Don't send this one */
1033 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1034 rc = CONFNAK; /* Not anymore... */
1035 ucp = inp; /* Backup */
1040 if (orc == CONFREJ && /* Reject this CI */
1041 rc != CONFREJ) { /* but no prior ones? */
1043 ucp = inp; /* Backup */
1046 /* Need to move CI? */
1048 BCOPY(cip, ucp, cilen); /* Move it */
1050 /* Update output pointer */
1055 * If we aren't rejecting this packet, and we want to negotiate
1056 * their identifier and they didn't send their identifier, then we
1057 * send a NAK with a CI_IFACEID option appended. We assume the
1058 * input buffer is long enough that we can append the extra
1061 if (rc != CONFREJ && !ho->neg_ifaceid &&
1062 wo->req_ifaceid && !reject_if_disagree) {
1063 if (rc == CONFACK) {
1065 ucp = inp; /* reset pointer */
1066 wo->req_ifaceid = 0; /* don't ask again */
1068 PUTCHAR(CI_IFACEID, ucp);
1069 PUTCHAR(CILEN_IFACEID, ucp);
1070 eui64_put(wo->hisid, ucp);
1073 *len = ucp - inp; /* Compute output length */
1074 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc)));
1075 return (rc); /* Return final code */
1080 * ipv6_check_options - check that any IP-related options are OK,
1081 * and assign appropriate defaults.
1084 ipv6_check_options()
1086 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
1088 if (!ipv6cp_protent.enabled_flag)
1091 #if defined(SOL2) || defined(__linux__)
1093 * Persistent link-local id is only used when user has not explicitly
1094 * configure/hard-code the id
1096 if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) {
1099 * On systems where there are no Ethernet interfaces used, there
1100 * may be other ways to obtain a persistent id. Right now, it
1101 * will fall back to using magic [see eui64_magic] below when
1102 * an EUI-48 from MAC address can't be obtained. Other possibilities
1103 * include obtaining EEPROM serial numbers, or some other unique
1104 * yet persistent number. On Sparc platforms, this is possible,
1105 * but too bad there's no standards yet for x86 machines.
1107 if (ether_to_eui64(&wo->ourid)) {
1113 if (!wo->opt_local) { /* init interface identifier */
1114 if (wo->use_ip && eui64_iszero(wo->ourid)) {
1115 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr));
1116 if (!eui64_iszero(wo->ourid))
1120 while (eui64_iszero(wo->ourid))
1121 eui64_magic(wo->ourid);
1124 if (!wo->opt_remote) {
1125 if (wo->use_ip && eui64_iszero(wo->hisid)) {
1126 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr));
1127 if (!eui64_iszero(wo->hisid))
1132 if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) {
1133 option_error("local/remote LL address required for demand-dialling\n");
1134 exit(EXIT_OPTION_ERROR);
1140 * ipv6_demand_conf - configure the interface as though
1141 * IPV6CP were up, for use with dial-on-demand.
1147 ipv6cp_options *wo = &ipv6cp_wantoptions[u];
1149 #if defined(__linux__) || defined(SOL2) || (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1150 #if defined(SOL2) || defined(__linux__)
1156 #endif /* defined(SOL2) || defined(__linux__) */
1158 if (!sif6addr(u, wo->ourid, wo->hisid))
1160 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1164 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE))
1167 notice("ipv6_demand_conf");
1168 notice("local LL address %s", llv6_ntoa(wo->ourid));
1169 notice("remote LL address %s", llv6_ntoa(wo->hisid));
1176 * ipv6cp_up - IPV6CP has come UP.
1178 * Configure the IPv6 network interface appropriately and bring it up.
1184 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
1185 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
1186 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
1188 IPV6CPDEBUG(("ipv6cp: up"));
1191 * We must have a non-zero LL address for both ends of the link.
1193 if (!ho->neg_ifaceid)
1194 ho->hisid = wo->hisid;
1196 if(!no_ifaceid_neg) {
1197 if (eui64_iszero(ho->hisid)) {
1198 error("Could not determine remote LL address");
1199 ipv6cp_close(f->unit, "Could not determine remote LL address");
1202 if (eui64_iszero(go->ourid)) {
1203 error("Could not determine local LL address");
1204 ipv6cp_close(f->unit, "Could not determine local LL address");
1207 if (eui64_equals(go->ourid, ho->hisid)) {
1208 error("local and remote LL addresses are equal");
1209 ipv6cp_close(f->unit, "local and remote LL addresses are equal");
1213 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0);
1214 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0);
1217 /* set tcp compression */
1218 sif6comp(f->unit, ho->neg_vj);
1222 * If we are doing dial-on-demand, the interface is already
1223 * configured, so we put out any saved-up packets, then set the
1224 * interface to pass IPv6 packets.
1227 if (! eui64_equals(go->ourid, wo->ourid) ||
1228 ! eui64_equals(ho->hisid, wo->hisid)) {
1229 if (! eui64_equals(go->ourid, wo->ourid))
1230 warn("Local LL address changed to %s",
1231 llv6_ntoa(go->ourid));
1232 if (! eui64_equals(ho->hisid, wo->hisid))
1233 warn("Remote LL address changed to %s",
1234 llv6_ntoa(ho->hisid));
1235 ipv6cp_clear_addrs(f->unit, go->ourid, ho->hisid);
1237 /* Set the interface to the new addresses */
1238 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1240 warn("sif6addr failed");
1241 ipv6cp_close(f->unit, "Interface configuration failed");
1246 demand_rexmit(PPP_IPV6);
1247 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1253 #if !defined(__linux__) && !defined(SOL2) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1254 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1256 warn("sif6addr failed");
1257 ipv6cp_close(f->unit, "Interface configuration failed");
1262 /* bring the interface up for IPv6 */
1263 #if defined(SOL2) || defined(__linux__)
1264 if (!sif6up(f->unit)) {
1266 warn("sif6up failed (IPV6)");
1267 ipv6cp_close(f->unit, "Interface configuration failed");
1271 if (!sifup(f->unit)) {
1273 warn("sifup failed (IPV6)");
1274 ipv6cp_close(f->unit, "Interface configuration failed");
1277 #endif /* defined(SOL2) || defined(__linux__) */
1279 #if defined(__linux__) || defined(SOL2) || (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1280 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1282 warn("sif6addr failed");
1283 ipv6cp_close(f->unit, "Interface configuration failed");
1287 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1289 notice("local LL address %s", llv6_ntoa(go->ourid));
1290 notice("remote LL address %s", llv6_ntoa(ho->hisid));
1293 np_up(f->unit, PPP_IPV6);
1296 notify(ipv6_up_notifier, 0);
1301 * Execute the ipv6-up script, like this:
1302 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL
1304 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) {
1305 ipv6cp_script_state = s_up;
1306 ipv6cp_script(_PATH_IPV6UP);
1312 * ipv6cp_down - IPV6CP has gone DOWN.
1314 * Take the IPv6 network interface down, clear its addresses
1315 * and delete routes through it.
1321 IPV6CPDEBUG(("ipv6cp: down"));
1322 update_link_stats(f->unit);
1323 notify(ipv6_down_notifier, 0);
1328 np_down(f->unit, PPP_IPV6);
1331 sif6comp(f->unit, 0);
1335 * If we are doing dial-on-demand, set the interface
1336 * to queue up outgoing packets (for now).
1339 sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE);
1341 sifnpmode(f->unit, PPP_IPV6, NPMODE_DROP);
1342 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC)))
1347 #endif /* defined(SOL2) */
1349 ipv6cp_clear_addrs(f->unit,
1350 ipv6cp_gotoptions[f->unit].ourid,
1351 ipv6cp_hisoptions[f->unit].hisid);
1352 #if defined(__linux__)
1354 #elif defined(SVR4) && (defined(SNI) || defined(__USLC))
1359 /* Execute the ipv6-down script */
1360 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) {
1361 ipv6cp_script_state = s_down;
1362 ipv6cp_script(_PATH_IPV6DOWN);
1368 * ipv6cp_clear_addrs() - clear the interface addresses, routes,
1369 * proxy neighbour discovery entries, etc.
1372 ipv6cp_clear_addrs(unit, ourid, hisid)
1377 cif6addr(unit, ourid, hisid);
1382 * ipv6cp_finished - possibly shut down the lower layers.
1388 np_finished(f->unit, PPP_IPV6);
1393 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script
1397 ipv6cp_script_done(arg)
1400 ipv6cp_script_pid = 0;
1401 switch (ipv6cp_script_state) {
1403 if (ipv6cp_fsm[0].state != OPENED) {
1404 ipv6cp_script_state = s_down;
1405 ipv6cp_script(_PATH_IPV6DOWN);
1409 if (ipv6cp_fsm[0].state == OPENED) {
1410 ipv6cp_script_state = s_up;
1411 ipv6cp_script(_PATH_IPV6UP);
1419 * ipv6cp_script - Execute a script with arguments
1420 * interface-name tty-name speed local-LL remote-LL.
1423 ipv6cp_script(script)
1426 char strspeed[32], strlocal[32], strremote[32];
1429 sprintf(strspeed, "%d", baud_rate);
1430 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid));
1431 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid));
1438 argv[5] = strremote;
1442 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done,
1447 * ipv6cp_printpkt - print the contents of an IPV6CP packet.
1449 static char *ipv6cp_codenames[] = {
1450 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1451 "TermReq", "TermAck", "CodeRej"
1455 ipv6cp_printpkt(p, plen, printer, arg)
1458 void (*printer) __P((void *, char *, ...));
1461 int code, id, len, olen;
1462 u_char *pstart, *optend;
1466 if (plen < HEADERLEN)
1472 if (len < HEADERLEN || len > plen)
1475 if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *))
1476 printer(arg, " %s", ipv6cp_codenames[code-1]);
1478 printer(arg, " code=0x%x", code);
1479 printer(arg, " id=0x%x", id);
1486 /* print option list */
1491 if (olen < 2 || olen > len) {
1498 case CI_COMPRESSTYPE:
1499 if (olen >= CILEN_COMPRESS) {
1501 GETSHORT(cishort, p);
1502 printer(arg, "compress ");
1503 printer(arg, "0x%x", cishort);
1507 if (olen == CILEN_IFACEID) {
1509 eui64_get(ifaceid, p);
1510 printer(arg, "addr %s", llv6_ntoa(ifaceid));
1514 while (p < optend) {
1516 printer(arg, " %.2x", code);
1524 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1526 print_string((char *)p, len, printer, arg);
1533 /* print the rest of the bytes in the packet */
1534 for (; len > 0; --len) {
1536 printer(arg, " %.2x", code);
1543 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for.
1544 * We don't bring the link up for IP fragments or for TCP FIN packets
1547 #define IP6_HDRLEN 40 /* bytes */
1548 #define IP6_NHDR_FRAG 44 /* fragment IPv6 header */
1549 #define TCP_HDRLEN 20
1553 * We use these macros because the IP header may be at an odd address,
1554 * and some compilers might use word loads to get th_off or ip_hl.
1557 #define get_ip6nh(x) (((unsigned char *)(x))[6])
1558 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1559 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1562 ipv6_active_pkt(pkt, len)
1570 if (len < IP6_HDRLEN)
1572 if (get_ip6nh(pkt) == IP6_NHDR_FRAG)
1574 if (get_ip6nh(pkt) != IPPROTO_TCP)
1576 if (len < IP6_HDRLEN + TCP_HDRLEN)
1578 tcp = pkt + IP6_HDRLEN;
1579 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4)