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 { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent,
253 "Use uniquely-available persistent value for link local address", 1 },
255 { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime,
256 "Set timeout for IPv6CP", OPT_PRIO },
257 { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits,
258 "Set max #xmits for term-reqs", OPT_PRIO },
259 { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits,
260 "Set max #xmits for conf-reqs", OPT_PRIO },
261 { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops,
262 "Set max #conf-naks for IPv6CP", OPT_PRIO },
269 * Protocol entry points from main code.
271 static void ipv6cp_init __P((int));
272 static void ipv6cp_open __P((int));
273 static void ipv6cp_close __P((int, char *));
274 static void ipv6cp_lowerup __P((int));
275 static void ipv6cp_lowerdown __P((int));
276 static void ipv6cp_input __P((int, u_char *, int));
277 static void ipv6cp_protrej __P((int));
278 static int ipv6cp_printpkt __P((u_char *, int,
279 void (*) __P((void *, char *, ...)), void *));
280 static void ipv6_check_options __P((void));
281 static int ipv6_demand_conf __P((int));
282 static int ipv6_active_pkt __P((u_char *, int));
284 struct protent ipv6cp_protent = {
304 static void ipv6cp_clear_addrs __P((int, eui64_t, eui64_t));
305 static void ipv6cp_script __P((char *));
306 static void ipv6cp_script_done __P((void *));
309 * Lengths of configuration options.
312 #define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */
313 #define CILEN_IFACEID 10 /* RFC2472, interface identifier */
315 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
316 (x) == CONFNAK ? "NAK" : "REJ")
319 * This state variable is used to ensure that we don't
320 * run an ipcp-up/down script while one is already running.
322 static enum script_state {
325 } ipv6cp_script_state;
326 static pid_t ipv6cp_script_pid;
329 * setifaceid - set the interface identifiers manually
335 char *comma, *arg, c;
336 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
337 struct in6_addr addr;
338 static int prio_local, prio_remote;
340 #define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \
341 (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) )
344 if ((comma = strchr(arg, ',')) == NULL)
345 comma = arg + strlen(arg);
348 * If comma first character, then no local identifier
354 if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) {
355 option_error("Illegal interface identifier (local): %s", arg);
359 if (option_priority >= prio_local) {
360 eui64_copy(addr.s6_addr32[2], wo->ourid);
362 prio_local = option_priority;
368 * If comma last character, the no remote identifier
370 if (*comma != 0 && *++comma != '\0') {
371 if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) {
372 option_error("Illegal interface identifier (remote): %s", comma);
375 if (option_priority >= prio_remote) {
376 eui64_copy(addr.s6_addr32[2], wo->hisid);
378 prio_remote = option_priority;
382 if (override_value("+ipv6", option_priority, option_source))
383 ipv6cp_protent.enabled_flag = 1;
387 char *llv6_ntoa(eui64_t ifaceid);
390 printifaceid(opt, printer, arg)
392 void (*printer) __P((void *, char *, ...));
395 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
398 printer(arg, "%s", llv6_ntoa(wo->ourid));
401 printer(arg, "%s", llv6_ntoa(wo->hisid));
405 * Make a string representation of a network address.
413 sprintf(b, "fe80::%s", eui64_ntoa(ifaceid));
419 * ipv6cp_init - Initialize IPV6CP.
425 fsm *f = &ipv6cp_fsm[unit];
426 ipv6cp_options *wo = &ipv6cp_wantoptions[unit];
427 ipv6cp_options *ao = &ipv6cp_allowoptions[unit];
430 f->protocol = PPP_IPV6CP;
431 f->callbacks = &ipv6cp_callbacks;
432 fsm_init(&ipv6cp_fsm[unit]);
434 memset(wo, 0, sizeof(*wo));
435 memset(ao, 0, sizeof(*ao));
437 wo->accept_local = 1;
444 wo->vj_protocol = IPV6CP_COMP;
451 * ipv6cp_open - IPV6CP is allowed to come up.
457 fsm_open(&ipv6cp_fsm[unit]);
462 * ipv6cp_close - Take IPV6CP down.
465 ipv6cp_close(unit, reason)
469 fsm_close(&ipv6cp_fsm[unit], reason);
474 * ipv6cp_lowerup - The lower layer is up.
480 fsm_lowerup(&ipv6cp_fsm[unit]);
485 * ipv6cp_lowerdown - The lower layer is down.
488 ipv6cp_lowerdown(unit)
491 fsm_lowerdown(&ipv6cp_fsm[unit]);
496 * ipv6cp_input - Input IPV6CP packet.
499 ipv6cp_input(unit, p, len)
504 fsm_input(&ipv6cp_fsm[unit], p, len);
509 * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP.
511 * Pretend the lower layer went down, so we shut up.
517 fsm_lowerdown(&ipv6cp_fsm[unit]);
522 * ipv6cp_resetci - Reset our CI.
528 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
529 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
531 wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid;
533 if (!wo->opt_local) {
534 eui64_magic_nz(wo->ourid);
538 eui64_zero(go->hisid); /* last proposed interface identifier */
543 * ipv6cp_cilen - Return length of our CI.
549 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
551 #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0)
552 #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0)
554 return (LENCIIFACEID(go->neg_ifaceid) +
555 LENCIVJ(go->neg_vj));
560 * ipv6cp_addci - Add our desired CIs to a packet.
563 ipv6cp_addci(f, ucp, lenp)
568 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
571 #define ADDCIVJ(opt, neg, val) \
573 int vjlen = CILEN_COMPRESS; \
574 if (len >= vjlen) { \
576 PUTCHAR(vjlen, ucp); \
577 PUTSHORT(val, ucp); \
583 #define ADDCIIFACEID(opt, neg, val1) \
585 int idlen = CILEN_IFACEID; \
586 if (len >= idlen) { \
588 PUTCHAR(idlen, ucp); \
589 eui64_put(val1, ucp); \
595 ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
597 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
604 * ipv6cp_ackci - Ack our CIs.
611 ipv6cp_ackci(f, p, len)
616 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
617 u_short cilen, citype, cishort;
621 * CIs must be in exactly the same order that we sent...
622 * Check packet length and CI length at each step.
623 * If we find any deviations, then this packet is bad.
626 #define ACKCIVJ(opt, neg, val) \
628 int vjlen = CILEN_COMPRESS; \
629 if ((len -= vjlen) < 0) \
631 GETCHAR(citype, p); \
633 if (cilen != vjlen || \
636 GETSHORT(cishort, p); \
637 if (cishort != val) \
641 #define ACKCIIFACEID(opt, neg, val1) \
643 int idlen = CILEN_IFACEID; \
644 if ((len -= idlen) < 0) \
646 GETCHAR(citype, p); \
648 if (cilen != idlen || \
651 eui64_get(ifaceid, p); \
652 if (! eui64_equals(val1, ifaceid)) \
656 ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid);
658 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol);
661 * If there are any remaining CIs, then this packet is bad.
668 IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!"));
673 * ipv6cp_nakci - Peer has sent a NAK for some of our CIs.
674 * This should not modify any state if the Nak is bad
675 * or if IPV6CP is in the OPENED state.
682 ipv6cp_nakci(f, p, len, treat_as_reject)
688 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
689 u_char citype, cilen, *next;
692 ipv6cp_options no; /* options we've seen Naks for */
693 ipv6cp_options try; /* options to request next time */
695 BZERO(&no, sizeof(no));
699 * Any Nak'd CIs must be in exactly the same order that we sent.
700 * Check packet length and CI length at each step.
701 * If we find any deviations, then this packet is bad.
703 #define NAKCIIFACEID(opt, neg, code) \
705 len >= (cilen = CILEN_IFACEID) && \
710 eui64_get(ifaceid, p); \
715 #define NAKCIVJ(opt, neg, code) \
717 ((cilen = p[1]) == CILEN_COMPRESS) && \
722 GETSHORT(cishort, p); \
728 * Accept the peer's idea of {our,his} interface identifier, if different
729 * from our idea, only if the accept_{local,remote} flag is set.
731 NAKCIIFACEID(CI_IFACEID, neg_ifaceid,
732 if (treat_as_reject) {
734 } else if (go->accept_local) {
735 while (eui64_iszero(ifaceid) ||
736 eui64_equals(ifaceid, go->hisid)) /* bad luck */
737 eui64_magic(ifaceid);
739 IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid)));
744 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
746 if (cishort == IPV6CP_COMP && !treat_as_reject) {
747 try.vj_protocol = cishort;
754 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
762 * There may be remaining CIs, if the peer is requesting negotiation
763 * on an option that we didn't include in our request packet.
764 * If they want to negotiate about interface identifier, we comply.
765 * If they want us to ask for compression, we refuse.
767 while (len >= CILEN_VOID) {
770 if ( cilen < CILEN_VOID || (len -= cilen) < 0 )
772 next = p + cilen - 2;
775 case CI_COMPRESSTYPE:
776 if (go->neg_vj || no.neg_vj ||
777 (cilen != CILEN_COMPRESS))
782 if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID)
785 eui64_get(ifaceid, p);
786 if (go->accept_local) {
787 while (eui64_iszero(ifaceid) ||
788 eui64_equals(ifaceid, go->hisid)) /* bad luck */
789 eui64_magic(ifaceid);
798 /* If there is still anything left, this packet is bad. */
803 * OK, the Nak is good. Now we can update state.
805 if (f->state != OPENED)
811 IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!"));
817 * ipv6cp_rejci - Reject some of our CIs.
820 ipv6cp_rejci(f, p, len)
825 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
829 ipv6cp_options try; /* options to request next time */
833 * Any Rejected CIs must be in exactly the same order that we sent.
834 * Check packet length and CI length at each step.
835 * If we find any deviations, then this packet is bad.
837 #define REJCIIFACEID(opt, neg, val1) \
839 len >= (cilen = CILEN_IFACEID) && \
844 eui64_get(ifaceid, p); \
845 /* Check rejected value. */ \
846 if (! eui64_equals(ifaceid, val1)) \
851 #define REJCIVJ(opt, neg, val) \
853 p[1] == CILEN_COMPRESS && \
858 GETSHORT(cishort, p); \
859 /* Check rejected value. */ \
860 if (cishort != val) \
865 REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid);
867 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol);
870 * If there are any remaining CIs, then this packet is bad.
875 * Now we can update state.
877 if (f->state != OPENED)
882 IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!"));
888 * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response.
890 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
891 * appropriately. If reject_if_disagree is non-zero, doesn't return
892 * CONFNAK; returns CONFREJ if it can't return CONFACK.
895 ipv6cp_reqci(f, inp, len, reject_if_disagree)
897 u_char *inp; /* Requested CIs */
898 int *len; /* Length of requested CIs */
899 int reject_if_disagree;
901 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
902 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
903 ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit];
904 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
905 u_char *cip, *next; /* Pointer to current and next CIs */
906 u_short cilen, citype; /* Parsed len, type */
907 u_short cishort; /* Parsed short value */
908 eui64_t ifaceid; /* Parsed interface identifier */
909 int rc = CONFACK; /* Final packet return code */
910 int orc; /* Individual option return code */
911 u_char *p; /* Pointer to next char to parse */
912 u_char *ucp = inp; /* Pointer to current output char */
913 int l = *len; /* Length left */
916 * Reset all his options.
918 BZERO(ho, sizeof(*ho));
921 * Process all his options.
925 orc = CONFACK; /* Assume success */
926 cip = p = next; /* Remember begining of CI */
927 if (l < 2 || /* Not enough data for CI header or */
928 p[1] < 2 || /* CI length too small or */
929 p[1] > l) { /* CI length too big? */
930 IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!"));
931 orc = CONFREJ; /* Reject bad CI */
932 cilen = l; /* Reject till end of packet */
933 l = 0; /* Don't loop again */
936 GETCHAR(citype, p); /* Parse CI type */
937 GETCHAR(cilen, p); /* Parse CI length */
938 l -= cilen; /* Adjust remaining length */
939 next += cilen; /* Step to next CI */
941 switch (citype) { /* Check CI type */
943 IPV6CPDEBUG(("ipv6cp: received interface identifier "));
945 if (!ao->neg_ifaceid ||
946 cilen != CILEN_IFACEID) { /* Check CI length */
947 orc = CONFREJ; /* Reject CI */
952 * If he has no interface identifier, or if we both have same
953 * identifier then NAK it with new idea.
954 * In particular, if we don't know his identifier, but he does,
957 eui64_get(ifaceid, p);
958 IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid)));
959 if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) {
960 orc = CONFREJ; /* Reject CI */
963 if (!eui64_iszero(wo->hisid) &&
964 !eui64_equals(ifaceid, wo->hisid) &&
965 eui64_iszero(go->hisid)) {
970 DECPTR(sizeof(ifaceid), p);
971 eui64_put(ifaceid, p);
973 if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) {
975 if (eui64_iszero(go->hisid)) /* first time, try option */
977 while (eui64_iszero(ifaceid) ||
978 eui64_equals(ifaceid, go->ourid)) /* bad luck */
979 eui64_magic(ifaceid);
981 DECPTR(sizeof(ifaceid), p);
982 eui64_put(ifaceid, p);
989 case CI_COMPRESSTYPE:
990 IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE "));
992 (cilen != CILEN_COMPRESS)) {
996 GETSHORT(cishort, p);
997 IPV6CPDEBUG(("(%d)", cishort));
1000 if (!(cishort == IPV6CP_COMP)) {
1006 ho->vj_protocol = cishort;
1019 IPV6CPDEBUG((" (%s)\n", CODENAME(orc)));
1021 if (orc == CONFACK && /* Good CI */
1022 rc != CONFACK) /* but prior CI wasnt? */
1023 continue; /* Don't send this one */
1025 if (orc == CONFNAK) { /* Nak this CI? */
1026 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1027 orc = CONFREJ; /* Get tough if so */
1029 if (rc == CONFREJ) /* Rejecting prior CI? */
1030 continue; /* Don't send this one */
1031 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1032 rc = CONFNAK; /* Not anymore... */
1033 ucp = inp; /* Backup */
1038 if (orc == CONFREJ && /* Reject this CI */
1039 rc != CONFREJ) { /* but no prior ones? */
1041 ucp = inp; /* Backup */
1044 /* Need to move CI? */
1046 BCOPY(cip, ucp, cilen); /* Move it */
1048 /* Update output pointer */
1053 * If we aren't rejecting this packet, and we want to negotiate
1054 * their identifier and they didn't send their identifier, then we
1055 * send a NAK with a CI_IFACEID option appended. We assume the
1056 * input buffer is long enough that we can append the extra
1059 if (rc != CONFREJ && !ho->neg_ifaceid &&
1060 wo->req_ifaceid && !reject_if_disagree) {
1061 if (rc == CONFACK) {
1063 ucp = inp; /* reset pointer */
1064 wo->req_ifaceid = 0; /* don't ask again */
1066 PUTCHAR(CI_IFACEID, ucp);
1067 PUTCHAR(CILEN_IFACEID, ucp);
1068 eui64_put(wo->hisid, ucp);
1071 *len = ucp - inp; /* Compute output length */
1072 IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc)));
1073 return (rc); /* Return final code */
1078 * ipv6_check_options - check that any IP-related options are OK,
1079 * and assign appropriate defaults.
1082 ipv6_check_options()
1084 ipv6cp_options *wo = &ipv6cp_wantoptions[0];
1086 if (!ipv6cp_protent.enabled_flag)
1090 * Persistent link-local id is only used when user has not explicitly
1091 * configure/hard-code the id
1093 if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) {
1096 * On systems where there are no Ethernet interfaces used, there
1097 * may be other ways to obtain a persistent id. Right now, it
1098 * will fall back to using magic [see eui64_magic] below when
1099 * an EUI-48 from MAC address can't be obtained. Other possibilities
1100 * include obtaining EEPROM serial numbers, or some other unique
1101 * yet persistent number. On Sparc platforms, this is possible,
1102 * but too bad there's no standards yet for x86 machines.
1104 if (ether_to_eui64(&wo->ourid)) {
1109 if (!wo->opt_local) { /* init interface identifier */
1110 if (wo->use_ip && eui64_iszero(wo->ourid)) {
1111 eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr));
1112 if (!eui64_iszero(wo->ourid))
1116 while (eui64_iszero(wo->ourid))
1117 eui64_magic(wo->ourid);
1120 if (!wo->opt_remote) {
1121 if (wo->use_ip && eui64_iszero(wo->hisid)) {
1122 eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr));
1123 if (!eui64_iszero(wo->hisid))
1128 if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) {
1129 option_error("local/remote LL address required for demand-dialling\n");
1130 exit(EXIT_OPTION_ERROR);
1136 * ipv6_demand_conf - configure the interface as though
1137 * IPV6CP were up, for use with dial-on-demand.
1143 ipv6cp_options *wo = &ipv6cp_wantoptions[u];
1147 if (!sif6addr(u, wo->ourid, wo->hisid))
1149 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1153 if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE))
1156 notice("ipv6_demand_conf");
1157 notice("local LL address %s", llv6_ntoa(wo->ourid));
1158 notice("remote LL address %s", llv6_ntoa(wo->hisid));
1165 * ipv6cp_up - IPV6CP has come UP.
1167 * Configure the IPv6 network interface appropriately and bring it up.
1173 ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit];
1174 ipv6cp_options *go = &ipv6cp_gotoptions[f->unit];
1175 ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit];
1177 IPV6CPDEBUG(("ipv6cp: up"));
1180 * We must have a non-zero LL address for both ends of the link.
1182 if (!ho->neg_ifaceid)
1183 ho->hisid = wo->hisid;
1185 if(!no_ifaceid_neg) {
1186 if (eui64_iszero(ho->hisid)) {
1187 error("Could not determine remote LL address");
1188 ipv6cp_close(f->unit, "Could not determine remote LL address");
1191 if (eui64_iszero(go->ourid)) {
1192 error("Could not determine local LL address");
1193 ipv6cp_close(f->unit, "Could not determine local LL address");
1196 if (eui64_equals(go->ourid, ho->hisid)) {
1197 error("local and remote LL addresses are equal");
1198 ipv6cp_close(f->unit, "local and remote LL addresses are equal");
1202 script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0);
1203 script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0);
1206 /* set tcp compression */
1207 sif6comp(f->unit, ho->neg_vj);
1211 * If we are doing dial-on-demand, the interface is already
1212 * configured, so we put out any saved-up packets, then set the
1213 * interface to pass IPv6 packets.
1216 if (! eui64_equals(go->ourid, wo->ourid) ||
1217 ! eui64_equals(ho->hisid, wo->hisid)) {
1218 if (! eui64_equals(go->ourid, wo->ourid))
1219 warn("Local LL address changed to %s",
1220 llv6_ntoa(go->ourid));
1221 if (! eui64_equals(ho->hisid, wo->hisid))
1222 warn("Remote LL address changed to %s",
1223 llv6_ntoa(ho->hisid));
1224 ipv6cp_clear_addrs(f->unit, go->ourid, ho->hisid);
1226 /* Set the interface to the new addresses */
1227 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1229 warn("sif6addr failed");
1230 ipv6cp_close(f->unit, "Interface configuration failed");
1235 demand_rexmit(PPP_IPV6);
1236 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1239 /* bring the interface up for IPv6 */
1240 if (!sif6up(f->unit)) {
1242 warn("sif6up failed (IPV6)");
1243 ipv6cp_close(f->unit, "Interface configuration failed");
1247 if (!sif6addr(f->unit, go->ourid, ho->hisid)) {
1249 warn("sif6addr failed");
1250 ipv6cp_close(f->unit, "Interface configuration failed");
1253 sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
1255 notice("local LL address %s", llv6_ntoa(go->ourid));
1256 notice("remote LL address %s", llv6_ntoa(ho->hisid));
1259 np_up(f->unit, PPP_IPV6);
1262 notify(ipv6_up_notifier, 0);
1267 * Execute the ipv6-up script, like this:
1268 * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL
1270 if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) {
1271 ipv6cp_script_state = s_up;
1272 ipv6cp_script(_PATH_IPV6UP);
1278 * ipv6cp_down - IPV6CP has gone DOWN.
1280 * Take the IPv6 network interface down, clear its addresses
1281 * and delete routes through it.
1287 IPV6CPDEBUG(("ipv6cp: down"));
1288 update_link_stats(f->unit);
1289 notify(ipv6_down_notifier, 0);
1294 np_down(f->unit, PPP_IPV6);
1297 sif6comp(f->unit, 0);
1301 * If we are doing dial-on-demand, set the interface
1302 * to queue up outgoing packets (for now).
1305 sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE);
1307 sifnpmode(f->unit, PPP_IPV6, NPMODE_DROP);
1308 #if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC)))
1311 ipv6cp_clear_addrs(f->unit,
1312 ipv6cp_gotoptions[f->unit].ourid,
1313 ipv6cp_hisoptions[f->unit].hisid);
1314 #if defined(__linux__)
1316 #elif defined(SVR4) && (defined(SNI) || defined(__USLC))
1321 /* Execute the ipv6-down script */
1322 if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) {
1323 ipv6cp_script_state = s_down;
1324 ipv6cp_script(_PATH_IPV6DOWN);
1330 * ipv6cp_clear_addrs() - clear the interface addresses, routes,
1331 * proxy neighbour discovery entries, etc.
1334 ipv6cp_clear_addrs(unit, ourid, hisid)
1339 cif6addr(unit, ourid, hisid);
1344 * ipv6cp_finished - possibly shut down the lower layers.
1350 np_finished(f->unit, PPP_IPV6);
1355 * ipv6cp_script_done - called when the ipv6-up or ipv6-down script
1359 ipv6cp_script_done(arg)
1362 ipv6cp_script_pid = 0;
1363 switch (ipv6cp_script_state) {
1365 if (ipv6cp_fsm[0].state != OPENED) {
1366 ipv6cp_script_state = s_down;
1367 ipv6cp_script(_PATH_IPV6DOWN);
1371 if (ipv6cp_fsm[0].state == OPENED) {
1372 ipv6cp_script_state = s_up;
1373 ipv6cp_script(_PATH_IPV6UP);
1381 * ipv6cp_script - Execute a script with arguments
1382 * interface-name tty-name speed local-LL remote-LL.
1385 ipv6cp_script(script)
1388 char strspeed[32], strlocal[32], strremote[32];
1391 sprintf(strspeed, "%d", baud_rate);
1392 strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid));
1393 strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid));
1400 argv[5] = strremote;
1404 ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done,
1409 * ipv6cp_printpkt - print the contents of an IPV6CP packet.
1411 static char *ipv6cp_codenames[] = {
1412 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1413 "TermReq", "TermAck", "CodeRej"
1417 ipv6cp_printpkt(p, plen, printer, arg)
1420 void (*printer) __P((void *, char *, ...));
1423 int code, id, len, olen;
1424 u_char *pstart, *optend;
1428 if (plen < HEADERLEN)
1434 if (len < HEADERLEN || len > plen)
1437 if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *))
1438 printer(arg, " %s", ipv6cp_codenames[code-1]);
1440 printer(arg, " code=0x%x", code);
1441 printer(arg, " id=0x%x", id);
1448 /* print option list */
1453 if (olen < 2 || olen > len) {
1460 case CI_COMPRESSTYPE:
1461 if (olen >= CILEN_COMPRESS) {
1463 GETSHORT(cishort, p);
1464 printer(arg, "compress ");
1465 printer(arg, "0x%x", cishort);
1469 if (olen == CILEN_IFACEID) {
1471 eui64_get(ifaceid, p);
1472 printer(arg, "addr %s", llv6_ntoa(ifaceid));
1476 while (p < optend) {
1478 printer(arg, " %.2x", code);
1486 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1488 print_string((char *)p, len, printer, arg);
1495 /* print the rest of the bytes in the packet */
1496 for (; len > 0; --len) {
1498 printer(arg, " %.2x", code);
1505 * ipv6_active_pkt - see if this IP packet is worth bringing the link up for.
1506 * We don't bring the link up for IP fragments or for TCP FIN packets
1509 #define IP6_HDRLEN 40 /* bytes */
1510 #define IP6_NHDR_FRAG 44 /* fragment IPv6 header */
1511 #define TCP_HDRLEN 20
1515 * We use these macros because the IP header may be at an odd address,
1516 * and some compilers might use word loads to get th_off or ip_hl.
1519 #define get_ip6nh(x) (((unsigned char *)(x))[6])
1520 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1521 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1524 ipv6_active_pkt(pkt, len)
1532 if (len < IP6_HDRLEN)
1534 if (get_ip6nh(pkt) == IP6_NHDR_FRAG)
1536 if (get_ip6nh(pkt) != IPPROTO_TCP)
1538 if (len < IP6_HDRLEN + TCP_HDRLEN)
1540 tcp = pkt + IP6_HDRLEN;
1541 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4)