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)
157 #include <sys/param.h>
158 #include <sys/types.h>
159 #include <sys/socket.h>
160 #include <netinet/in.h>
161 #include <arpa/inet.h>
168 #include "pathnames.h"
170 static const char rcsid[] = RCSID;
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 ipv6cp_is_up;
182 /* Hook for a plugin to know when IPv6 protocol has come up */
183 void (*ipv6_up_hook) __P((void)) = NULL;
185 /* Hook for a plugin to know when IPv6 protocol has come down */
186 void (*ipv6_down_hook) __P((void)) = NULL;
188 /* Notifiers for when IPCPv6 goes up and down */
189 struct notifier *ipv6_up_notifier = NULL;
190 struct notifier *ipv6_down_notifier = NULL;
193 * Callbacks for fsm code. (CI = Configuration Information)
195 static void ipv6cp_resetci __P((fsm *)); /* Reset our CI */
196 static int ipv6cp_cilen __P((fsm *)); /* Return length of our CI */
197 static void ipv6cp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
198 static int ipv6cp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
199 static int ipv6cp_nakci __P((fsm *, u_char *, int, int));/* Peer nak'd our CI */
200 static int ipv6cp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
201 static int ipv6cp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
202 static void ipv6cp_up __P((fsm *)); /* We're UP */
203 static void ipv6cp_down __P((fsm *)); /* We're DOWN */
204 static void ipv6cp_finished __P((fsm *)); /* Don't need lower layer */
206 fsm ipv6cp_fsm[NUM_PPP]; /* IPV6CP fsm structure */
208 static fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */
209 ipv6cp_resetci, /* Reset our Configuration Information */
210 ipv6cp_cilen, /* Length of our Configuration Information */
211 ipv6cp_addci, /* Add our Configuration Information */
212 ipv6cp_ackci, /* ACK our Configuration Information */
213 ipv6cp_nakci, /* NAK our Configuration Information */
214 ipv6cp_rejci, /* Reject our Configuration Information */
215 ipv6cp_reqci, /* Request peer's Configuration Information */
216 ipv6cp_up, /* Called when fsm reaches OPENED state */
217 ipv6cp_down, /* Called when fsm leaves OPENED state */
218 NULL, /* Called when we want the lower layer up */
219 ipv6cp_finished, /* Called when we want the lower layer down */
220 NULL, /* Called when Protocol-Reject received */
221 NULL, /* Retransmission is necessary */
222 NULL, /* Called to handle protocol-specific codes */
223 "IPV6CP" /* String name of protocol */
227 * Command-line options.
229 static int setifaceid __P((char **arg));
230 static void printifaceid __P((option_t *,
231 void (*)(void *, char *, ...), void *));
233 static option_t ipv6cp_option_list[] = {
234 { "ipv6", o_special, (void *)setifaceid,
235 "Set interface identifiers for IPV6",
236 OPT_A2PRINTER, (void *)printifaceid },
238 { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag,
239 "Enable IPv6 and IPv6CP", OPT_PRIO | 1 },
240 { "noipv6", o_bool, &ipv6cp_protent.enabled_flag,
241 "Disable IPv6 and IPv6CP", OPT_PRIOSUB },
242 { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag,
243 "Disable IPv6 and IPv6CP", OPT_PRIOSUB | OPT_ALIAS },
245 { "ipv6cp-accept-local", o_bool, &ipv6cp_allowoptions[0].accept_local,
246 "Accept peer's interface identifier for us", 1 },
248 { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip,
249 "Use (default) IPv4 address as interface identifier", 1 },
251 #if defined(SOL2) || defined(__linux__)
252 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent,
253 "Use uniquely-available persistent value for link local address", 1 },
254 #endif /* defined(SOL2) */
256 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime,
257 "Set timeout for IPv6CP", OPT_PRIO },
258 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits,
259 "Set max #xmits for term-reqs", OPT_PRIO },
260 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits,
261 "Set max #xmits for conf-reqs", OPT_PRIO },
262 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops,
263 "Set max #conf-naks for IPv6CP", OPT_PRIO },
270 * Protocol entry points from main code.
272 static void ipv6cp_init __P((int));
273 static void ipv6cp_open __P((int));
274 static void ipv6cp_close __P((int, char *));
275 static void ipv6cp_lowerup __P((int));
276 static void ipv6cp_lowerdown __P((int));
277 static void ipv6cp_input __P((int, u_char *, int));
278 static void ipv6cp_protrej __P((int));
279 static int ipv6cp_printpkt __P((u_char *, int,
280 void (*) __P((void *, char *, ...)), void *));
281 static void ipv6_check_options __P((void));
282 static int ipv6_demand_conf __P((int));
283 static int ipv6_active_pkt __P((u_char *, int));
285 struct protent ipv6cp_protent = {
305 static void ipv6cp_clear_addrs __P((int, eui64_t, eui64_t));
306 static void ipv6cp_script __P((char *));
307 static void ipv6cp_script_done __P((void *));
310 * Lengths of configuration options.
313 #define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */
314 #define CILEN_IFACEID 10 /* RFC2472, interface identifier */
316 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
317 (x) == CONFNAK ? "NAK" : "REJ")
320 * This state variable is used to ensure that we don't
321 * run an ipcp-up/down script while one is already running.
323 static enum script_state {
326 } ipv6cp_script_state;
327 static pid_t ipv6cp_script_pid;
330 * setifaceid - set the interface identifiers manually
336 char *comma, *arg, c;
337 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
338 struct in6_addr addr;
339 static int prio_local, prio_remote;
341 #define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \
342 (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) )
345 if ((comma = strchr(arg, ',')) == NULL)
346 comma = arg + strlen(arg);
349 * If comma first character, then no local identifier
355 if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) {
356 option_error("Illegal interface identifier (local): %s", arg);
360 if (option_priority >= prio_local) {
361 eui64_copy(addr.s6_addr32[2], wo->ourid);
363 prio_local = option_priority;
369 * If comma last character, the no remote identifier
371 if (*comma != 0 && *++comma != '\0') {
372 if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) {
373 option_error("Illegal interface identifier (remote): %s", comma);
376 if (option_priority >= prio_remote) {
377 eui64_copy(addr.s6_addr32[2], wo->hisid);
379 prio_remote = option_priority;
383 if (override_value("+ipv6", option_priority, option_source))
384 ipv6cp_protent.enabled_flag = 1;
388 char *llv6_ntoa(eui64_t ifaceid);
391 printifaceid(opt, printer, arg)
393 void (*printer) __P((void *, char *, ...));
396 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
399 printer(arg, "%s", llv6_ntoa(wo->ourid));
402 printer(arg, "%s", llv6_ntoa(wo->hisid));
406 * Make a string representation of a network address.
414 sprintf(b, "fe80::%s", eui64_ntoa(ifaceid));
420 * ipv6cp_init - Initialize IPV6CP.
426 fsm *f = &ipv6cp_fsm[unit];
427 ipv6cp_options *wo = &ipv6cp_wantoptions[unit];
428 ipv6cp_options *ao = &ipv6cp_allowoptions[unit];
431 f->protocol = PPP_IPV6CP;
432 f->callbacks = &ipv6cp_callbacks;
433 fsm_init(&ipv6cp_fsm[unit]);
435 memset(wo, 0, sizeof(*wo));
436 memset(ao, 0, sizeof(*ao));
438 wo->accept_local = 1;
445 wo->vj_protocol = IPV6CP_COMP;
452 * ipv6cp_open - IPV6CP is allowed to come up.
458 fsm_open(&ipv6cp_fsm[unit]);
463 * ipv6cp_close - Take IPV6CP down.
466 ipv6cp_close(unit, reason)
470 fsm_close(&ipv6cp_fsm[unit], reason);
475 * ipv6cp_lowerup - The lower layer is up.
481 fsm_lowerup(&ipv6cp_fsm[unit]);
486 * ipv6cp_lowerdown - The lower layer is down.
489 ipv6cp_lowerdown(unit)
492 fsm_lowerdown(&ipv6cp_fsm[unit]);
497 * ipv6cp_input - Input IPV6CP packet.
500 ipv6cp_input(unit, p, len)
505 fsm_input(&ipv6cp_fsm[unit], p, len);
510 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP.
512 * Pretend the lower layer went down, so we shut up.
518 fsm_lowerdown(&ipv6cp_fsm[unit]);
523 * ipv6cp_resetci - Reset our CI.
529 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
530 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
532 wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid;
534 if (!wo->opt_local) {
535 eui64_magic_nz(wo->ourid);
539 eui64_zero(go->hisid); /* last proposed interface identifier */
544 * ipv6cp_cilen - Return length of our CI.
550 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
552 #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0)
553 #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0)
555 return (LENCIIFACEID(go->neg_ifaceid) +
556 LENCIVJ(go->neg_vj));
561 * ipv6cp_addci - Add our desired CIs to a packet.
564 ipv6cp_addci(f, ucp, lenp)
569 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
572 #define ADDCIVJ(opt, neg, val) \
574 int vjlen = CILEN_COMPRESS; \
575 if (len >= vjlen) { \
577 PUTCHAR(vjlen, ucp); \
578 PUTSHORT(val, ucp); \
584 #define ADDCIIFACEID(opt, neg, val1) \
586 int idlen = CILEN_IFACEID; \
587 if (len >= idlen) { \
589 PUTCHAR(idlen, ucp); \
590 eui64_put(val1, ucp); \
596 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
598 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
605 * ipv6cp_ackci - Ack our CIs.
612 ipv6cp_ackci(f, p, len)
617 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
618 u_short cilen, citype, cishort;
622 * CIs must be in exactly the same order that we sent...
623 * Check packet length and CI length at each step.
624 * If we find any deviations, then this packet is bad.
627 #define ACKCIVJ(opt, neg, val) \
629 int vjlen = CILEN_COMPRESS; \
630 if ((len -= vjlen) < 0) \
632 GETCHAR(citype, p); \
634 if (cilen != vjlen || \
637 GETSHORT(cishort, p); \
638 if (cishort != val) \
642 #define ACKCIIFACEID(opt, neg, val1) \
644 int idlen = CILEN_IFACEID; \
645 if ((len -= idlen) < 0) \
647 GETCHAR(citype, p); \
649 if (cilen != idlen || \
652 eui64_get(ifaceid, p); \
653 if (! eui64_equals(val1, ifaceid)) \
657 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
659 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
662 * If there are any remaining CIs, then this packet is bad.
669 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!"));
674 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs.
675 * This should not modify any state if the Nak is bad
676 * or if IPV6CP is in the OPENED state.
683 ipv6cp_nakci(f, p, len, treat_as_reject)
689 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
690 u_char citype, cilen, *next;
693 ipv6cp_options no; /* options we've seen Naks for */
694 ipv6cp_options try; /* options to request next time */
696 BZERO(&no, sizeof(no));
700 * Any Nak'd CIs must be in exactly the same order that we sent.
701 * Check packet length and CI length at each step.
702 * If we find any deviations, then this packet is bad.
704 #define NAKCIIFACEID(opt, neg, code) \
706 len >= (cilen = CILEN_IFACEID) && \
711 eui64_get(ifaceid, p); \
716 #define NAKCIVJ(opt, neg, code) \
718 ((cilen = p[1]) == CILEN_COMPRESS) && \
723 GETSHORT(cishort, p); \
729 * Accept the peer's idea of {our,his} interface identifier, if different
730 * from our idea, only if the accept_{local,remote} flag is set.
732 NAKCIIFACEID(CI_IFACEID, neg_ifaceid,
733 if (treat_as_reject) {
735 } else if (go->accept_local) {
736 while (eui64_iszero(ifaceid) ||
737 eui64_equals(ifaceid, go->hisid)) /* bad luck */
738 eui64_magic(ifaceid);
740 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid)));
745 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
747 if (cishort == IPV6CP_COMP && !treat_as_reject) {
748 try.vj_protocol = cishort;
755 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
763 * There may be remaining CIs, if the peer is requesting negotiation
764 * on an option that we didn't include in our request packet.
765 * If they want to negotiate about interface identifier, we comply.
766 * If they want us to ask for compression, we refuse.
768 while (len >= CILEN_VOID) {
771 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
773 next = p + cilen - 2;
776 case CI_COMPRESSTYPE:
777 if (go->neg_vj || no.neg_vj ||
778 (cilen != CILEN_COMPRESS))
783 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID)
786 eui64_get(ifaceid, p);
787 if (go->accept_local) {
788 while (eui64_iszero(ifaceid) ||
789 eui64_equals(ifaceid, go->hisid)) /* bad luck */
790 eui64_magic(ifaceid);
799 /* If there is still anything left, this packet is bad. */
804 * OK, the Nak is good. Now we can update state.
806 if (f->state != OPENED)
812 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!"));
818 * ipv6cp_rejci - Reject some of our CIs.
821 ipv6cp_rejci(f, p, len)
826 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
830 ipv6cp_options try; /* options to request next time */
834 * Any Rejected CIs must be in exactly the same order that we sent.
835 * Check packet length and CI length at each step.
836 * If we find any deviations, then this packet is bad.
838 #define REJCIIFACEID(opt, neg, val1) \
840 len >= (cilen = CILEN_IFACEID) && \
845 eui64_get(ifaceid, p); \
846 /* Check rejected value. */ \
847 if (! eui64_equals(ifaceid, val1)) \
852 #define REJCIVJ(opt, neg, val) \
854 p[1] == CILEN_COMPRESS && \
859 GETSHORT(cishort, p); \
860 /* Check rejected value. */ \
861 if (cishort != val) \
866 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid);
868 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol);
871 * If there are any remaining CIs, then this packet is bad.
876 * Now we can update state.
878 if (f->state != OPENED)
883 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!"));
889 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response.
891 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
892 * appropriately. If reject_if_disagree is non-zero, doesn't return
893 * CONFNAK; returns CONFREJ if it can't return CONFACK.
896 ipv6cp_reqci(f, inp, len, reject_if_disagree)
898 u_char *inp; /* Requested CIs */
899 int *len; /* Length of requested CIs */
900 int reject_if_disagree;
902 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
903 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
904 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit];
905 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
906 u_char *cip, *next; /* Pointer to current and next CIs */
907 u_short cilen, citype; /* Parsed len, type */
908 u_short cishort; /* Parsed short value */
909 eui64_t ifaceid; /* Parsed interface identifier */
910 int rc = CONFACK; /* Final packet return code */
911 int orc; /* Individual option return code */
912 u_char *p; /* Pointer to next char to parse */
913 u_char *ucp = inp; /* Pointer to current output char */
914 int l = *len; /* Length left */
917 * Reset all his options.
919 BZERO(ho, sizeof(*ho));
922 * Process all his options.
926 orc = CONFACK; /* Assume success */
927 cip = p = next; /* Remember begining of CI */
928 if (l < 2 || /* Not enough data for CI header or */
929 p[1] < 2 || /* CI length too small or */
930 p[1] > l) { /* CI length too big? */
931 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!"));
932 orc = CONFREJ; /* Reject bad CI */
933 cilen = l; /* Reject till end of packet */
934 l = 0; /* Don't loop again */
937 GETCHAR(citype, p); /* Parse CI type */
938 GETCHAR(cilen, p); /* Parse CI length */
939 l -= cilen; /* Adjust remaining length */
940 next += cilen; /* Step to next CI */
942 switch (citype) { /* Check CI type */
944 IPV6CPDEBUG(("ipv6cp: received interface identifier "));
946 if (!ao->neg_ifaceid ||
947 cilen != CILEN_IFACEID) { /* Check CI length */
948 orc = CONFREJ; /* Reject CI */
953 * If he has no interface identifier, or if we both have same
954 * identifier then NAK it with new idea.
955 * In particular, if we don't know his identifier, but he does,
958 eui64_get(ifaceid, p);
959 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid)));
960 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) {
961 orc = CONFREJ; /* Reject CI */
964 if (!eui64_iszero(wo->hisid) &&
965 !eui64_equals(ifaceid, wo->hisid) &&
966 eui64_iszero(go->hisid)) {
971 DECPTR(sizeof(ifaceid), p);
972 eui64_put(ifaceid, p);
974 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) {
976 if (eui64_iszero(go->hisid)) /* first time, try option */
978 while (eui64_iszero(ifaceid) ||
979 eui64_equals(ifaceid, go->ourid)) /* bad luck */
980 eui64_magic(ifaceid);
982 DECPTR(sizeof(ifaceid), p);
983 eui64_put(ifaceid, p);
990 case CI_COMPRESSTYPE:
991 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE "));
993 (cilen != CILEN_COMPRESS)) {
997 GETSHORT(cishort, p);
998 IPV6CPDEBUG(("(%d)", cishort));
1001 if (!(cishort == IPV6CP_COMP)) {
1007 ho->vj_protocol = cishort;
1020 IPV6CPDEBUG((" (%s)\n", CODENAME(orc)));
1022 if (orc == CONFACK && /* Good CI */
1023 rc != CONFACK) /* but prior CI wasnt? */
1024 continue; /* Don't send this one */
1026 if (orc == CONFNAK) { /* Nak this CI? */
1027 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1028 orc = CONFREJ; /* Get tough if so */
1030 if (rc == CONFREJ) /* Rejecting prior CI? */
1031 continue; /* Don't send this one */
1032 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1033 rc = CONFNAK; /* Not anymore... */
1034 ucp = inp; /* Backup */
1039 if (orc == CONFREJ && /* Reject this CI */
1040 rc != CONFREJ) { /* but no prior ones? */
1042 ucp = inp; /* Backup */
1045 /* Need to move CI? */
1047 BCOPY(cip, ucp, cilen); /* Move it */
1049 /* Update output pointer */
1054 * If we aren't rejecting this packet, and we want to negotiate
1055 * their identifier and they didn't send their identifier, then we
1056 * send a NAK with a CI_IFACEID option appended. We assume the
1057 * input buffer is long enough that we can append the extra
1060 if (rc != CONFREJ && !ho->neg_ifaceid &&
1061 wo->req_ifaceid && !reject_if_disagree) {
1062 if (rc == CONFACK) {
1064 ucp = inp; /* reset pointer */
1065 wo->req_ifaceid = 0; /* don't ask again */
1067 PUTCHAR(CI_IFACEID, ucp);
1068 PUTCHAR(CILEN_IFACEID, ucp);
1069 eui64_put(wo->hisid, ucp);
1072 *len = ucp - inp; /* Compute output length */
1073 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc)));
1074 return (rc); /* Return final code */
1079 * ipv6_check_options - check that any IP-related options are OK,
1080 * and assign appropriate defaults.
1083 ipv6_check_options()
1085 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
1087 if (!ipv6cp_protent.enabled_flag)
1090 #if defined(SOL2) || defined(__linux__)
1092 * Persistent link-local id is only used when user has not explicitly
1093 * configure/hard-code the id
1095 if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) {
1098 * On systems where there are no Ethernet interfaces used, there
1099 * may be other ways to obtain a persistent id. Right now, it
1100 * will fall back to using magic [see eui64_magic] below when
1101 * an EUI-48 from MAC address can't be obtained. Other possibilities
1102 * include obtaining EEPROM serial numbers, or some other unique
1103 * yet persistent number. On Sparc platforms, this is possible,
1104 * but too bad there's no standards yet for x86 machines.
1106 if (ether_to_eui64(&wo->ourid)) {
1112 if (!wo->opt_local) { /* init interface identifier */
1113 if (wo->use_ip && eui64_iszero(wo->ourid)) {
1114 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr));
1115 if (!eui64_iszero(wo->ourid))
1119 while (eui64_iszero(wo->ourid))
1120 eui64_magic(wo->ourid);
1123 if (!wo->opt_remote) {
1124 if (wo->use_ip && eui64_iszero(wo->hisid)) {
1125 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr));
1126 if (!eui64_iszero(wo->hisid))
1131 if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) {
1132 option_error("local/remote LL address required for demand-dialling\n");
1139 * ipv6_demand_conf - configure the interface as though
1140 * IPV6CP were up, for use with dial-on-demand.
1146 ipv6cp_options *wo = &ipv6cp_wantoptions[u];
1148 #if defined(__linux__) || defined(SOL2) || (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1155 #endif /* defined(SOL2) */
1157 if (!sif6addr(u, wo->ourid, wo->hisid))
1159 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1163 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE))
1166 notice("ipv6_demand_conf");
1167 notice("local LL address %s", llv6_ntoa(wo->ourid));
1168 notice("remote LL address %s", llv6_ntoa(wo->hisid));
1175 * ipv6cp_up - IPV6CP has come UP.
1177 * Configure the IPv6 network interface appropriately and bring it up.
1183 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
1184 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
1185 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
1187 IPV6CPDEBUG(("ipv6cp: up"));
1190 * We must have a non-zero LL address for both ends of the link.
1192 if (!ho->neg_ifaceid)
1193 ho->hisid = wo->hisid;
1195 if(!no_ifaceid_neg) {
1196 if (eui64_iszero(ho->hisid)) {
1197 error("Could not determine remote LL address");
1198 ipv6cp_close(f->unit, "Could not determine remote LL address");
1201 if (eui64_iszero(go->ourid)) {
1202 error("Could not determine local LL address");
1203 ipv6cp_close(f->unit, "Could not determine local LL address");
1206 if (eui64_equals(go->ourid, ho->hisid)) {
1207 error("local and remote LL addresses are equal");
1208 ipv6cp_close(f->unit, "local and remote LL addresses are equal");
1212 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0);
1213 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0);
1216 /* set tcp compression */
1217 sif6comp(f->unit, ho->neg_vj);
1221 * If we are doing dial-on-demand, the interface is already
1222 * configured, so we put out any saved-up packets, then set the
1223 * interface to pass IPv6 packets.
1226 if (! eui64_equals(go->ourid, wo->ourid) ||
1227 ! eui64_equals(ho->hisid, wo->hisid)) {
1228 if (! eui64_equals(go->ourid, wo->ourid))
1229 warn("Local LL address changed to %s",
1230 llv6_ntoa(go->ourid));
1231 if (! eui64_equals(ho->hisid, wo->hisid))
1232 warn("Remote LL address changed to %s",
1233 llv6_ntoa(ho->hisid));
1234 ipv6cp_clear_addrs(f->unit, go->ourid, ho->hisid);
1236 /* Set the interface to the new addresses */
1237 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1239 warn("sif6addr failed");
1240 ipv6cp_close(f->unit, "Interface configuration failed");
1245 demand_rexmit(PPP_IPV6);
1246 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1252 #if !defined(__linux__) && !defined(SOL2) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1253 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1255 warn("sif6addr failed");
1256 ipv6cp_close(f->unit, "Interface configuration failed");
1261 /* bring the interface up for IPv6 */
1263 if (!sif6up(f->unit)) {
1265 warn("sifup failed (IPV6)");
1266 ipv6cp_close(f->unit, "Interface configuration failed");
1270 if (!sifup(f->unit)) {
1272 warn("sifup failed (IPV6)");
1273 ipv6cp_close(f->unit, "Interface configuration failed");
1276 #endif /* defined(SOL2) */
1278 #if defined(__linux__) || defined(SOL2) || (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1279 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1281 warn("sif6addr failed");
1282 ipv6cp_close(f->unit, "Interface configuration failed");
1286 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1288 notice("local LL address %s", llv6_ntoa(go->ourid));
1289 notice("remote LL address %s", llv6_ntoa(ho->hisid));
1292 np_up(f->unit, PPP_IPV6);
1295 notify(ipv6_up_notifier, 0);
1300 * Execute the ipv6-up script, like this:
1301 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL
1303 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) {
1304 ipv6cp_script_state = s_up;
1305 ipv6cp_script(_PATH_IPV6UP);
1311 * ipv6cp_down - IPV6CP has gone DOWN.
1313 * Take the IPv6 network interface down, clear its addresses
1314 * and delete routes through it.
1320 IPV6CPDEBUG(("ipv6cp: down"));
1321 update_link_stats(f->unit);
1322 notify(ipv6_down_notifier, 0);
1327 np_down(f->unit, PPP_IPV6);
1330 sif6comp(f->unit, 0);
1334 * If we are doing dial-on-demand, set the interface
1335 * to queue up outgoing packets (for now).
1338 sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE);
1340 sifnpmode(f->unit, PPP_IPV6, NPMODE_DROP);
1341 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC)))
1346 #endif /* defined(SOL2) */
1348 ipv6cp_clear_addrs(f->unit,
1349 ipv6cp_gotoptions[f->unit].ourid,
1350 ipv6cp_hisoptions[f->unit].hisid);
1351 #if defined(__linux__) || (defined(SVR4) && (defined(SNI) || defined(__USLC)))
1356 /* Execute the ipv6-down script */
1357 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) {
1358 ipv6cp_script_state = s_down;
1359 ipv6cp_script(_PATH_IPV6DOWN);
1365 * ipv6cp_clear_addrs() - clear the interface addresses, routes,
1366 * proxy neighbour discovery entries, etc.
1369 ipv6cp_clear_addrs(unit, ourid, hisid)
1374 cif6addr(unit, ourid, hisid);
1379 * ipv6cp_finished - possibly shut down the lower layers.
1385 np_finished(f->unit, PPP_IPV6);
1390 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script
1394 ipv6cp_script_done(arg)
1397 ipv6cp_script_pid = 0;
1398 switch (ipv6cp_script_state) {
1400 if (ipv6cp_fsm[0].state != OPENED) {
1401 ipv6cp_script_state = s_down;
1402 ipv6cp_script(_PATH_IPV6DOWN);
1406 if (ipv6cp_fsm[0].state == OPENED) {
1407 ipv6cp_script_state = s_up;
1408 ipv6cp_script(_PATH_IPV6UP);
1416 * ipv6cp_script - Execute a script with arguments
1417 * interface-name tty-name speed local-LL remote-LL.
1420 ipv6cp_script(script)
1423 char strspeed[32], strlocal[32], strremote[32];
1426 sprintf(strspeed, "%d", baud_rate);
1427 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid));
1428 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid));
1435 argv[5] = strremote;
1439 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done,
1444 * ipv6cp_printpkt - print the contents of an IPV6CP packet.
1446 static char *ipv6cp_codenames[] = {
1447 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1448 "TermReq", "TermAck", "CodeRej"
1452 ipv6cp_printpkt(p, plen, printer, arg)
1455 void (*printer) __P((void *, char *, ...));
1458 int code, id, len, olen;
1459 u_char *pstart, *optend;
1463 if (plen < HEADERLEN)
1469 if (len < HEADERLEN || len > plen)
1472 if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *))
1473 printer(arg, " %s", ipv6cp_codenames[code-1]);
1475 printer(arg, " code=0x%x", code);
1476 printer(arg, " id=0x%x", id);
1483 /* print option list */
1488 if (olen < 2 || olen > len) {
1495 case CI_COMPRESSTYPE:
1496 if (olen >= CILEN_COMPRESS) {
1498 GETSHORT(cishort, p);
1499 printer(arg, "compress ");
1500 printer(arg, "0x%x", cishort);
1504 if (olen == CILEN_IFACEID) {
1506 eui64_get(ifaceid, p);
1507 printer(arg, "addr %s", llv6_ntoa(ifaceid));
1511 while (p < optend) {
1513 printer(arg, " %.2x", code);
1521 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1523 print_string((char *)p, len, printer, arg);
1530 /* print the rest of the bytes in the packet */
1531 for (; len > 0; --len) {
1533 printer(arg, " %.2x", code);
1540 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for.
1541 * We don't bring the link up for IP fragments or for TCP FIN packets
1544 #define IP6_HDRLEN 40 /* bytes */
1545 #define IP6_NHDR_FRAG 44 /* fragment IPv6 header */
1546 #define TCP_HDRLEN 20
1550 * We use these macros because the IP header may be at an odd address,
1551 * and some compilers might use word loads to get th_off or ip_hl.
1554 #define get_ip6nh(x) (((unsigned char *)(x))[6])
1555 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1556 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1559 ipv6_active_pkt(pkt, len)
1567 if (len < IP6_HDRLEN)
1569 if (get_ip6nh(pkt) == IP6_NHDR_FRAG)
1571 if (get_ip6nh(pkt) != IPPROTO_TCP)
1573 if (len < IP6_HDRLEN + TCP_HDRLEN)
1575 tcp = pkt + IP6_HDRLEN;
1576 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4)