xref: /dragonfly/contrib/dhcpcd/src/dhcp6.c (revision c9c5aa9e)
1 /* SPDX-License-Identifier: BSD-2-Clause */
2 /*
3  * dhcpcd - DHCP client daemon
4  * Copyright (c) 2006-2020 Roy Marples <roy@marples.name>
5  * All rights reserved
6 
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <sys/utsname.h>
30 #include <sys/types.h>
31 
32 #include <netinet/in.h>
33 #include <netinet/ip6.h>
34 
35 #include <assert.h>
36 #include <ctype.h>
37 #include <errno.h>
38 #include <fcntl.h>
39 #include <inttypes.h>
40 #include <stdbool.h>
41 #include <stddef.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 #include <fcntl.h>
46 #include <syslog.h>
47 
48 #define ELOOP_QUEUE	ELOOP_DHCP6
49 #include "config.h"
50 #include "common.h"
51 #include "dhcp.h"
52 #include "dhcp6.h"
53 #include "duid.h"
54 #include "eloop.h"
55 #include "if.h"
56 #include "if-options.h"
57 #include "ipv6nd.h"
58 #include "logerr.h"
59 #include "privsep.h"
60 #include "script.h"
61 
62 #ifdef HAVE_SYS_BITOPS_H
63 #include <sys/bitops.h>
64 #else
65 #include "compat/bitops.h"
66 #endif
67 
68 /* DHCPCD Project has been assigned an IANA PEN of 40712 */
69 #define DHCPCD_IANA_PEN 40712
70 
71 /* Unsure if I want this */
72 //#define VENDOR_SPLIT
73 
74 /* Support older systems with different defines */
75 #if !defined(IPV6_RECVPKTINFO) && defined(IPV6_PKTINFO)
76 #define IPV6_RECVPKTINFO IPV6_PKTINFO
77 #endif
78 
79 #ifdef DHCP6
80 
81 /* Assert the correct structure size for on wire */
82 struct dhcp6_message {
83 	uint8_t type;
84 	uint8_t xid[3];
85 	/* followed by options */
86 };
87 __CTASSERT(sizeof(struct dhcp6_message) == 4);
88 
89 struct dhcp6_option {
90 	uint16_t code;
91 	uint16_t len;
92 	/* followed by data */
93 };
94 __CTASSERT(sizeof(struct dhcp6_option) == 4);
95 
96 struct dhcp6_ia_na {
97 	uint8_t iaid[4];
98 	uint32_t t1;
99 	uint32_t t2;
100 };
101 __CTASSERT(sizeof(struct dhcp6_ia_na) == 12);
102 
103 struct dhcp6_ia_ta {
104 	uint8_t iaid[4];
105 };
106 __CTASSERT(sizeof(struct dhcp6_ia_ta) == 4);
107 
108 struct dhcp6_ia_addr {
109 	struct in6_addr addr;
110 	uint32_t pltime;
111 	uint32_t vltime;
112 };
113 __CTASSERT(sizeof(struct dhcp6_ia_addr) == 16 + 8);
114 
115 /* XXX FIXME: This is the only packed structure and it does not align.
116  * Maybe manually decode it? */
117 struct dhcp6_pd_addr {
118 	uint32_t pltime;
119 	uint32_t vltime;
120 	uint8_t prefix_len;
121 	struct in6_addr prefix;
122 } __packed;
123 __CTASSERT(sizeof(struct dhcp6_pd_addr) == 8 + 1 + 16);
124 
125 struct dhcp6_op {
126 	uint16_t type;
127 	const char *name;
128 };
129 
130 static const struct dhcp6_op dhcp6_ops[] = {
131 	{ DHCP6_SOLICIT, "SOLICIT6" },
132 	{ DHCP6_ADVERTISE, "ADVERTISE6" },
133 	{ DHCP6_REQUEST, "REQUEST6" },
134 	{ DHCP6_REPLY, "REPLY6" },
135 	{ DHCP6_RENEW, "RENEW6" },
136 	{ DHCP6_REBIND, "REBIND6" },
137 	{ DHCP6_CONFIRM, "CONFIRM6" },
138 	{ DHCP6_INFORMATION_REQ, "INFORM6" },
139 	{ DHCP6_RELEASE, "RELEASE6" },
140 	{ DHCP6_RECONFIGURE, "RECONFIGURE6" },
141 	{ DHCP6_DECLINE, "DECLINE6" },
142 	{ 0, NULL }
143 };
144 
145 struct dhcp_compat {
146 	uint8_t dhcp_opt;
147 	uint16_t dhcp6_opt;
148 };
149 
150 static const struct dhcp_compat dhcp_compats[] = {
151 	{ DHO_DNSSERVER,	D6_OPTION_DNS_SERVERS },
152 	{ DHO_HOSTNAME,		D6_OPTION_FQDN },
153 	{ DHO_DNSDOMAIN,	D6_OPTION_FQDN },
154 	{ DHO_NISSERVER,	D6_OPTION_NIS_SERVERS },
155 	{ DHO_NTPSERVER,	D6_OPTION_SNTP_SERVERS },
156 	{ DHO_RAPIDCOMMIT,	D6_OPTION_RAPID_COMMIT },
157 	{ DHO_FQDN,		D6_OPTION_FQDN },
158 	{ DHO_VIVCO,		D6_OPTION_VENDOR_CLASS },
159 	{ DHO_VIVSO,		D6_OPTION_VENDOR_OPTS },
160 	{ DHO_DNSSEARCH,	D6_OPTION_DOMAIN_LIST },
161 	{ 0, 0 }
162 };
163 
164 static const char * const dhcp6_statuses[] = {
165 	"Success",
166 	"Unspecified Failure",
167 	"No Addresses Available",
168 	"No Binding",
169 	"Not On Link",
170 	"Use Multicast",
171 	"No Prefix Available"
172 };
173 
174 static void dhcp6_bind(struct interface *, const char *, const char *);
175 static void dhcp6_failinform(void *);
176 static void dhcp6_recvaddr(void *);
177 static void dhcp6_startdecline(struct interface *);
178 
179 #ifdef SMALL
180 #define dhcp6_hasprefixdelegation(a)	(0)
181 #else
182 static int dhcp6_hasprefixdelegation(struct interface *);
183 #endif
184 
185 #define DECLINE_IA(ia) \
186 	((ia)->addr_flags & IN6_IFF_DUPLICATED && \
187 	(ia)->ia_type != 0 && (ia)->ia_type != D6_OPTION_IA_PD && \
188 	!((ia)->flags & IPV6_AF_STALE) && \
189 	(ia)->prefix_vltime != 0)
190 
191 void
192 dhcp6_printoptions(const struct dhcpcd_ctx *ctx,
193     const struct dhcp_opt *opts, size_t opts_len)
194 {
195 	size_t i, j;
196 	const struct dhcp_opt *opt, *opt2;
197 	int cols;
198 
199 	for (i = 0, opt = ctx->dhcp6_opts;
200 	    i < ctx->dhcp6_opts_len; i++, opt++)
201 	{
202 		for (j = 0, opt2 = opts; j < opts_len; j++, opt2++)
203 			if (opt2->option == opt->option)
204 				break;
205 		if (j == opts_len) {
206 			cols = printf("%05d %s", opt->option, opt->var);
207 			dhcp_print_option_encoding(opt, cols);
208 		}
209 	}
210 	for (i = 0, opt = opts; i < opts_len; i++, opt++) {
211 		cols = printf("%05d %s", opt->option, opt->var);
212 		dhcp_print_option_encoding(opt, cols);
213 	}
214 }
215 
216 static size_t
217 dhcp6_makeuser(void *data, const struct interface *ifp)
218 {
219 	const struct if_options *ifo = ifp->options;
220 	struct dhcp6_option o;
221 	uint8_t *p;
222 	const uint8_t *up, *ue;
223 	uint16_t ulen, unlen;
224 	size_t olen;
225 
226 	/* Convert the DHCPv4 user class option to DHCPv6 */
227 	up = ifo->userclass;
228 	ulen = *up++;
229 	if (ulen == 0)
230 		return 0;
231 
232 	p = data;
233 	olen = 0;
234 	if (p != NULL)
235 		p += sizeof(o);
236 
237 	ue = up + ulen;
238 	for (; up < ue; up += ulen) {
239 		ulen = *up++;
240 		olen += sizeof(ulen) + ulen;
241 		if (data == NULL)
242 			continue;
243 		unlen = htons(ulen);
244 		memcpy(p, &unlen, sizeof(unlen));
245 		p += sizeof(unlen);
246 		memcpy(p, up, ulen);
247 		p += ulen;
248 	}
249 	if (data != NULL) {
250 		o.code = htons(D6_OPTION_USER_CLASS);
251 		o.len = htons((uint16_t)olen);
252 		memcpy(data, &o, sizeof(o));
253 	}
254 
255 	return sizeof(o) + olen;
256 }
257 
258 static size_t
259 dhcp6_makevendor(void *data, const struct interface *ifp)
260 {
261 	const struct if_options *ifo;
262 	size_t len, vlen, i;
263 	uint8_t *p;
264 	const struct vivco *vivco;
265 	struct dhcp6_option o;
266 
267 	ifo = ifp->options;
268 	len = sizeof(uint32_t); /* IANA PEN */
269 	if (ifo->vivco_en) {
270 		vlen = 0;
271 		for (i = 0, vivco = ifo->vivco;
272 		    i < ifo->vivco_len;
273 		    i++, vivco++)
274 			vlen += sizeof(uint16_t) + vivco->len;
275 		len += vlen;
276 	} else if (ifo->vendorclassid[0] != '\0') {
277 		/* dhcpcd owns DHCPCD_IANA_PEN.
278 		 * If you need your own string, get your own IANA PEN. */
279 		vlen = strlen(ifp->ctx->vendor);
280 		len += sizeof(uint16_t) + vlen;
281 	} else
282 		return 0;
283 
284 	if (len > UINT16_MAX) {
285 		logerrx("%s: DHCPv6 Vendor Class too big", ifp->name);
286 		return 0;
287 	}
288 
289 	if (data != NULL) {
290 		uint32_t pen;
291 		uint16_t hvlen;
292 
293 		p = data;
294 		o.code = htons(D6_OPTION_VENDOR_CLASS);
295 		o.len = htons((uint16_t)len);
296 		memcpy(p, &o, sizeof(o));
297 		p += sizeof(o);
298 		pen = htonl(ifo->vivco_en ? ifo->vivco_en : DHCPCD_IANA_PEN);
299 		memcpy(p, &pen, sizeof(pen));
300 		p += sizeof(pen);
301 
302 		if (ifo->vivco_en) {
303 			for (i = 0, vivco = ifo->vivco;
304 			    i < ifo->vivco_len;
305 			    i++, vivco++)
306 			{
307 				hvlen = htons((uint16_t)vivco->len);
308 				memcpy(p, &hvlen, sizeof(hvlen));
309 				p += sizeof(hvlen);
310 				memcpy(p, vivco->data, vivco->len);
311 				p += vivco->len;
312 			}
313 		} else if (ifo->vendorclassid[0] != '\0') {
314 			hvlen = htons((uint16_t)vlen);
315 			memcpy(p, &hvlen, sizeof(hvlen));
316 			p += sizeof(hvlen);
317 			memcpy(p, ifp->ctx->vendor, vlen);
318 		}
319 	}
320 
321 	return sizeof(o) + len;
322 }
323 
324 static void *
325 dhcp6_findoption(void *data, size_t data_len, uint16_t code, uint16_t *len)
326 {
327 	uint8_t *d;
328 	struct dhcp6_option o;
329 
330 	code = htons(code);
331 	for (d = data; data_len != 0; d += o.len, data_len -= o.len) {
332 		if (data_len < sizeof(o)) {
333 			errno = EINVAL;
334 			return NULL;
335 		}
336 		memcpy(&o, d, sizeof(o));
337 		d += sizeof(o);
338 		data_len -= sizeof(o);
339 		o.len = htons(o.len);
340 		if (data_len < o.len) {
341 			errno = EINVAL;
342 			return NULL;
343 		}
344 		if (o.code == code) {
345 			if (len != NULL)
346 				*len = o.len;
347 			return d;
348 		}
349 	}
350 
351 	errno = ENOENT;
352 	return NULL;
353 }
354 
355 static void *
356 dhcp6_findmoption(void *data, size_t data_len, uint16_t code,
357     uint16_t *len)
358 {
359 	uint8_t *d;
360 
361 	if (data_len < sizeof(struct dhcp6_message)) {
362 		errno = EINVAL;
363 		return false;
364 	}
365 	d = data;
366 	d += sizeof(struct dhcp6_message);
367 	data_len -= sizeof(struct dhcp6_message);
368 	return dhcp6_findoption(d, data_len, code, len);
369 }
370 
371 static const uint8_t *
372 dhcp6_getoption(struct dhcpcd_ctx *ctx,
373     size_t *os, unsigned int *code, size_t *len,
374     const uint8_t *od, size_t ol, struct dhcp_opt **oopt)
375 {
376 	struct dhcp6_option o;
377 	size_t i;
378 	struct dhcp_opt *opt;
379 
380 	if (od != NULL) {
381 		*os = sizeof(o);
382 		if (ol < *os) {
383 			errno = EINVAL;
384 			return NULL;
385 		}
386 		memcpy(&o, od, sizeof(o));
387 		*len = ntohs(o.len);
388 		if (*len > ol - *os) {
389 			errno = ERANGE;
390 			return NULL;
391 		}
392 		*code = ntohs(o.code);
393 	}
394 
395 	*oopt = NULL;
396 	for (i = 0, opt = ctx->dhcp6_opts;
397 	    i < ctx->dhcp6_opts_len; i++, opt++)
398 	{
399 		if (opt->option == *code) {
400 			*oopt = opt;
401 			break;
402 		}
403 	}
404 
405 	if (od != NULL)
406 		return od + sizeof(o);
407 	return NULL;
408 }
409 
410 static bool
411 dhcp6_updateelapsed(struct interface *ifp, struct dhcp6_message *m, size_t len)
412 {
413 	uint8_t *opt;
414 	uint16_t opt_len;
415 	struct dhcp6_state *state;
416 	struct timespec tv;
417 	unsigned long long hsec;
418 	uint16_t sec;
419 
420 	opt = dhcp6_findmoption(m, len, D6_OPTION_ELAPSED, &opt_len);
421 	if (opt == NULL)
422 		return false;
423 	if (opt_len != sizeof(sec)) {
424 		errno = EINVAL;
425 		return false;
426 	}
427 
428 	state = D6_STATE(ifp);
429 	clock_gettime(CLOCK_MONOTONIC, &tv);
430 	if (state->RTC == 0) {
431 		/* An RTC of zero means we're the first message
432 		 * out of the door, so the elapsed time is zero. */
433 		state->started = tv;
434 		hsec = 0;
435 	} else {
436 		unsigned long long secs;
437 		unsigned int nsecs;
438 
439 		secs = eloop_timespec_diff(&tv, &state->started, &nsecs);
440 		/* Elapsed time is measured in centiseconds.
441 		 * We need to be sure it will not potentially overflow. */
442 		if (secs >= (UINT16_MAX / CSEC_PER_SEC) + 1)
443 			hsec = UINT16_MAX;
444 		else {
445 			hsec = (secs * CSEC_PER_SEC) +
446 			    (nsecs / NSEC_PER_CSEC);
447 			if (hsec > UINT16_MAX)
448 				hsec = UINT16_MAX;
449 		}
450 	}
451 	sec = htons((uint16_t)hsec);
452 	memcpy(opt, &sec, sizeof(sec));
453 	return true;
454 }
455 
456 static void
457 dhcp6_newxid(const struct interface *ifp, struct dhcp6_message *m)
458 {
459 	const struct interface *ifp1;
460 	const struct dhcp6_state *state1;
461 	uint32_t xid;
462 
463 	if (ifp->options->options & DHCPCD_XID_HWADDR &&
464 	    ifp->hwlen >= sizeof(xid))
465 		/* The lower bits are probably more unique on the network */
466 		memcpy(&xid, (ifp->hwaddr + ifp->hwlen) - sizeof(xid),
467 		    sizeof(xid));
468 	else {
469 again:
470 		xid = arc4random();
471 	}
472 
473 	m->xid[0] = (xid >> 16) & 0xff;
474 	m->xid[1] = (xid >> 8) & 0xff;
475 	m->xid[2] = xid & 0xff;
476 
477 	/* Ensure it's unique */
478 	TAILQ_FOREACH(ifp1, ifp->ctx->ifaces, next) {
479 		if (ifp == ifp1)
480 			continue;
481 		if ((state1 = D6_CSTATE(ifp1)) == NULL)
482 			continue;
483 		if (state1->send != NULL &&
484 		    state1->send->xid[0] == m->xid[0] &&
485 		    state1->send->xid[1] == m->xid[1] &&
486 		    state1->send->xid[2] == m->xid[2])
487 			break;
488 	}
489 
490 	if (ifp1 != NULL) {
491 		if (ifp->options->options & DHCPCD_XID_HWADDR &&
492 		    ifp->hwlen >= sizeof(xid))
493 		{
494 			logerrx("%s: duplicate xid on %s",
495 			    ifp->name, ifp1->name);
496 			    return;
497 		}
498 		goto again;
499 	}
500 }
501 
502 #ifndef SMALL
503 static const struct if_sla *
504 dhcp6_findselfsla(struct interface *ifp)
505 {
506 	size_t i, j;
507 	struct if_ia *ia;
508 
509 	for (i = 0; i < ifp->options->ia_len; i++) {
510 		ia = &ifp->options->ia[i];
511 		if (ia->ia_type != D6_OPTION_IA_PD)
512 			continue;
513 		for (j = 0; j < ia->sla_len; j++) {
514 			if (strcmp(ia->sla[j].ifname, ifp->name) == 0)
515 				return &ia->sla[j];
516 		}
517 	}
518 	return NULL;
519 }
520 
521 static int
522 dhcp6_delegateaddr(struct in6_addr *addr, struct interface *ifp,
523     const struct ipv6_addr *prefix, const struct if_sla *sla, struct if_ia *ia)
524 {
525 	struct dhcp6_state *state;
526 	struct if_sla asla;
527 	char sabuf[INET6_ADDRSTRLEN];
528 	const char *sa;
529 
530 	state = D6_STATE(ifp);
531 	if (state == NULL) {
532 		ifp->if_data[IF_DATA_DHCP6] = calloc(1, sizeof(*state));
533 		state = D6_STATE(ifp);
534 		if (state == NULL) {
535 			logerr(__func__);
536 			return -1;
537 		}
538 
539 		TAILQ_INIT(&state->addrs);
540 		state->state = DH6S_DELEGATED;
541 		state->reason = "DELEGATED6";
542 	}
543 
544 	if (sla == NULL || !sla->sla_set) {
545 		/* No SLA set, so make an assumption of
546 		 * desired SLA and prefix length. */
547 		asla.sla = ifp->index;
548 		asla.prefix_len = 0;
549 		asla.sla_set = false;
550 		sla = &asla;
551 	} else if (sla->prefix_len == 0) {
552 		/* An SLA was given, but prefix length was not.
553 		 * We need to work out a suitable prefix length for
554 		 * potentially more than one interface. */
555 		asla.sla = sla->sla;
556 		asla.prefix_len = 0;
557 		asla.sla_set = sla->sla_set;
558 		sla = &asla;
559 	}
560 
561 	if (sla->prefix_len == 0) {
562 		uint32_t sla_max;
563 		int bits;
564 
565 		sla_max = ia->sla_max;
566 		if (sla_max == 0 && (sla == NULL || !sla->sla_set)) {
567 			const struct interface *ifi;
568 
569 			TAILQ_FOREACH(ifi, ifp->ctx->ifaces, next) {
570 				if (ifi->index > sla_max)
571 					sla_max = ifi->index;
572 			}
573 		}
574 
575 		bits = fls32(sla_max);
576 
577 		if (prefix->prefix_len + bits > (int)UINT8_MAX)
578 			asla.prefix_len = UINT8_MAX;
579 		else {
580 			asla.prefix_len = (uint8_t)(prefix->prefix_len + bits);
581 
582 			/* Make a 64 prefix by default, as this makes SLAAC
583 			 * possible.
584 			 * Otherwise round up to the nearest 4 bits. */
585 			if (asla.prefix_len <= 64)
586 				asla.prefix_len = 64;
587 			else
588 				asla.prefix_len =
589 				    (uint8_t)ROUNDUP4(asla.prefix_len);
590 		}
591 
592 #define BIT(n) (1UL << (n))
593 #define BIT_MASK(len) (BIT(len) - 1)
594 		if (ia->sla_max == 0) {
595 			/* Work out the real sla_max from our bits used */
596 			bits = asla.prefix_len - prefix->prefix_len;
597 			/* Make static analysis happy.
598 			 * Bits cannot be bigger than 32 thanks to fls32. */
599 			assert(bits <= 32);
600 			ia->sla_max = (uint32_t)BIT_MASK(bits);
601 		}
602 	}
603 
604 	if (ipv6_userprefix(&prefix->prefix, prefix->prefix_len,
605 		sla->sla, addr, sla->prefix_len) == -1)
606 	{
607 		sa = inet_ntop(AF_INET6, &prefix->prefix,
608 		    sabuf, sizeof(sabuf));
609 		logerr("%s: invalid prefix %s/%d + %d/%d",
610 		    ifp->name, sa, prefix->prefix_len,
611 		    sla->sla, sla->prefix_len);
612 		return -1;
613 	}
614 
615 	if (prefix->prefix_exclude_len &&
616 	    IN6_ARE_ADDR_EQUAL(addr, &prefix->prefix_exclude))
617 	{
618 		sa = inet_ntop(AF_INET6, &prefix->prefix_exclude,
619 		    sabuf, sizeof(sabuf));
620 		logerrx("%s: cannot delegate excluded prefix %s/%d",
621 		    ifp->name, sa, prefix->prefix_exclude_len);
622 		return -1;
623 	}
624 
625 	return sla->prefix_len;
626 }
627 #endif
628 
629 static int
630 dhcp6_makemessage(struct interface *ifp)
631 {
632 	struct dhcp6_state *state;
633 	struct dhcp6_message *m;
634 	struct dhcp6_option o;
635 	uint8_t *p, *si, *unicast, IA;
636 	size_t n, l, len, ml, hl;
637 	uint8_t type;
638 	uint16_t si_len, uni_len, n_options;
639 	uint8_t *o_lenp;
640 	struct if_options *ifo;
641 	const struct dhcp_opt *opt, *opt2;
642 	const struct ipv6_addr *ap;
643 	char hbuf[HOSTNAME_MAX_LEN + 1];
644 	const char *hostname;
645 	int fqdn;
646 	struct dhcp6_ia_na ia_na;
647 	uint16_t ia_na_len;
648 	struct if_ia *ifia;
649 #ifdef AUTH
650 	uint16_t auth_len;
651 #endif
652 	uint8_t duid[DUID_LEN];
653 	size_t duid_len = 0;
654 
655 	state = D6_STATE(ifp);
656 	if (state->send) {
657 		free(state->send);
658 		state->send = NULL;
659 	}
660 
661 	ifo = ifp->options;
662 	fqdn = ifo->fqdn;
663 
664 	if (fqdn == FQDN_DISABLE && ifo->options & DHCPCD_HOSTNAME) {
665 		/* We're sending the DHCPv4 hostname option, so send FQDN as
666 		 * DHCPv6 has no FQDN option and DHCPv4 must not send
667 		 * hostname and FQDN according to RFC4702 */
668 		fqdn = FQDN_BOTH;
669 	}
670 	if (fqdn != FQDN_DISABLE)
671 		hostname = dhcp_get_hostname(hbuf, sizeof(hbuf), ifo);
672 	else
673 		hostname = NULL; /* appearse gcc */
674 
675 	/* Work out option size first */
676 	n_options = 0;
677 	len = 0;
678 	si = NULL;
679 	hl = 0; /* Appease gcc */
680 	if (state->state != DH6S_RELEASE && state->state != DH6S_DECLINE) {
681 		for (l = 0, opt = ifp->ctx->dhcp6_opts;
682 		    l < ifp->ctx->dhcp6_opts_len;
683 		    l++, opt++)
684 		{
685 			for (n = 0, opt2 = ifo->dhcp6_override;
686 			    n < ifo->dhcp6_override_len;
687 			    n++, opt2++)
688 			{
689 				if (opt->option == opt2->option)
690 					break;
691 			}
692 			if (n < ifo->dhcp6_override_len)
693 				continue;
694 			if (!DHC_REQOPT(opt, ifo->requestmask6, ifo->nomask6))
695 				continue;
696 			n_options++;
697 			len += sizeof(o.len);
698 		}
699 #ifndef SMALL
700 		for (l = 0, opt = ifo->dhcp6_override;
701 		    l < ifo->dhcp6_override_len;
702 		    l++, opt++)
703 		{
704 			if (!DHC_REQOPT(opt, ifo->requestmask6, ifo->nomask6))
705 				continue;
706 			n_options++;
707 			len += sizeof(o.len);
708 		}
709 		if (dhcp6_findselfsla(ifp)) {
710 			n_options++;
711 			len += sizeof(o.len);
712 		}
713 #endif
714 		if (len)
715 			len += sizeof(o);
716 
717 		if (fqdn != FQDN_DISABLE) {
718 			hl = encode_rfc1035(hostname, NULL);
719 			len += sizeof(o) + 1 + hl;
720 		}
721 
722 		if (!has_option_mask(ifo->nomask6, D6_OPTION_MUDURL) &&
723 		    ifo->mudurl[0])
724 			len += sizeof(o) + ifo->mudurl[0];
725 
726 #ifdef AUTH
727 		if ((ifo->auth.options & DHCPCD_AUTH_SENDREQUIRE) !=
728 		    DHCPCD_AUTH_SENDREQUIRE &&
729 		    DHC_REQ(ifo->requestmask6, ifo->nomask6,
730 		    D6_OPTION_RECONF_ACCEPT))
731 			len += sizeof(o); /* Reconfigure Accept */
732 #endif
733 	}
734 
735 	len += sizeof(*state->send);
736 	len += sizeof(o) + sizeof(uint16_t); /* elapsed */
737 
738 	if (ifo->options & DHCPCD_ANONYMOUS) {
739 		duid_len = duid_make(duid, ifp, DUID_LL);
740 		len += sizeof(o) + duid_len;
741 	} else {
742 		len += sizeof(o) + ifp->ctx->duid_len;
743 	}
744 
745 	if (!has_option_mask(ifo->nomask6, D6_OPTION_USER_CLASS))
746 		len += dhcp6_makeuser(NULL, ifp);
747 	if (!has_option_mask(ifo->nomask6, D6_OPTION_VENDOR_CLASS))
748 		len += dhcp6_makevendor(NULL, ifp);
749 
750 	/* IA */
751 	m = NULL;
752 	ml = 0;
753 	switch(state->state) {
754 	case DH6S_REQUEST:
755 		m = state->recv;
756 		ml = state->recv_len;
757 		/* FALLTHROUGH */
758 	case DH6S_DECLINE:
759 		/* FALLTHROUGH */
760 	case DH6S_RELEASE:
761 		/* FALLTHROUGH */
762 	case DH6S_RENEW:
763 		if (m == NULL) {
764 			m = state->new;
765 			ml = state->new_len;
766 		}
767 		si = dhcp6_findmoption(m, ml, D6_OPTION_SERVERID, &si_len);
768 		if (si == NULL)
769 			return -1;
770 		len += sizeof(o) + si_len;
771 		/* FALLTHROUGH */
772 	case DH6S_REBIND:
773 		/* FALLTHROUGH */
774 	case DH6S_CONFIRM:
775 		/* FALLTHROUGH */
776 	case DH6S_DISCOVER:
777 		if (m == NULL) {
778 			m = state->new;
779 			ml = state->new_len;
780 		}
781 		TAILQ_FOREACH(ap, &state->addrs, next) {
782 			if (ap->flags & IPV6_AF_STALE)
783 				continue;
784 			if (!(ap->flags & IPV6_AF_REQUEST) &&
785 			    (ap->prefix_vltime == 0 ||
786 			    state->state == DH6S_DISCOVER))
787 				continue;
788 			if (DECLINE_IA(ap) && state->state != DH6S_DECLINE)
789 				continue;
790 			if (ap->ia_type == D6_OPTION_IA_PD) {
791 #ifndef SMALL
792 				len += sizeof(o) + sizeof(struct dhcp6_pd_addr);
793 				if (ap->prefix_exclude_len)
794 					len += sizeof(o) + 1 +
795 					    (uint8_t)((ap->prefix_exclude_len -
796 					    ap->prefix_len - 1) / NBBY) + 1;
797 #endif
798 			} else
799 				len += sizeof(o) + sizeof(struct dhcp6_ia_addr);
800 		}
801 		/* FALLTHROUGH */
802 	case DH6S_INIT:
803 		for (l = 0; l < ifo->ia_len; l++) {
804 			len += sizeof(o) + sizeof(uint32_t); /* IAID */
805 			/* IA_TA does not have T1 or T2 timers */
806 			if (ifo->ia[l].ia_type != D6_OPTION_IA_TA)
807 				len += sizeof(uint32_t) + sizeof(uint32_t);
808 		}
809 		IA = 1;
810 		break;
811 	default:
812 		IA = 0;
813 	}
814 
815 	if (state->state == DH6S_DISCOVER &&
816 	    !(ifp->ctx->options & DHCPCD_TEST) &&
817 	    DHC_REQ(ifo->requestmask6, ifo->nomask6, D6_OPTION_RAPID_COMMIT))
818 		len += sizeof(o);
819 
820 	if (m == NULL) {
821 		m = state->new;
822 		ml = state->new_len;
823 	}
824 
825 	switch(state->state) {
826 	case DH6S_INIT: /* FALLTHROUGH */
827 	case DH6S_DISCOVER:
828 		type = DHCP6_SOLICIT;
829 		break;
830 	case DH6S_REQUEST:
831 		type = DHCP6_REQUEST;
832 		break;
833 	case DH6S_CONFIRM:
834 		type = DHCP6_CONFIRM;
835 		break;
836 	case DH6S_REBIND:
837 		type = DHCP6_REBIND;
838 		break;
839 	case DH6S_RENEW:
840 		type = DHCP6_RENEW;
841 		break;
842 	case DH6S_INFORM:
843 		type = DHCP6_INFORMATION_REQ;
844 		break;
845 	case DH6S_RELEASE:
846 		type = DHCP6_RELEASE;
847 		break;
848 	case DH6S_DECLINE:
849 		type = DHCP6_DECLINE;
850 		break;
851 	default:
852 		errno = EINVAL;
853 		return -1;
854 	}
855 
856 	switch(state->state) {
857 	case DH6S_REQUEST: /* FALLTHROUGH */
858 	case DH6S_RENEW:   /* FALLTHROUGH */
859 	case DH6S_RELEASE:
860 		if (has_option_mask(ifo->nomask6, D6_OPTION_UNICAST)) {
861 			unicast = NULL;
862 			break;
863 		}
864 		unicast = dhcp6_findmoption(m, ml, D6_OPTION_UNICAST, &uni_len);
865 		break;
866 	default:
867 		unicast = NULL;
868 		break;
869 	}
870 
871 	/* In non master mode we listen and send from fixed addresses.
872 	 * We should try and match an address we have to unicast to,
873 	 * but for now this is the safest policy. */
874 	if (unicast != NULL && !(ifp->ctx->options & DHCPCD_MASTER)) {
875 		logdebugx("%s: ignoring unicast option as not master",
876 		    ifp->name);
877 		unicast = NULL;
878 	}
879 
880 #ifdef AUTH
881 	auth_len = 0;
882 	if (ifo->auth.options & DHCPCD_AUTH_SEND) {
883 		ssize_t alen = dhcp_auth_encode(ifp->ctx, &ifo->auth,
884 		    state->auth.token, NULL, 0, 6, type, NULL, 0);
885 		if (alen != -1 && alen > UINT16_MAX) {
886 			errno = ERANGE;
887 			alen = -1;
888 		}
889 		if (alen == -1)
890 			logerr("%s: %s: dhcp_auth_encode", __func__, ifp->name);
891 		else if (alen != 0) {
892 			auth_len = (uint16_t)alen;
893 			len += sizeof(o) + auth_len;
894 		}
895 	}
896 #endif
897 
898 	state->send = malloc(len);
899 	if (state->send == NULL)
900 		return -1;
901 
902 	state->send_len = len;
903 	state->send->type = type;
904 
905 	/* If we found a unicast option, copy it to our state for sending */
906 	if (unicast && uni_len == sizeof(state->unicast))
907 		memcpy(&state->unicast, unicast, sizeof(state->unicast));
908 	else
909 		state->unicast = in6addr_any;
910 
911 	dhcp6_newxid(ifp, state->send);
912 
913 #define COPYIN1(_code, _len)		{	\
914 	o.code = htons((_code));		\
915 	o.len = htons((_len));			\
916 	memcpy(p, &o, sizeof(o));		\
917 	p += sizeof(o);				\
918 }
919 #define COPYIN(_code, _data, _len)	do {	\
920 	COPYIN1((_code), (_len));		\
921 	if ((_len) != 0) {			\
922 		memcpy(p, (_data), (_len));	\
923 		p += (_len);			\
924 	}					\
925 } while (0 /* CONSTCOND */)
926 #define NEXTLEN (p + offsetof(struct dhcp6_option, len))
927 
928 	/* Options are listed in numerical order as per RFC 7844 Section 4.1
929 	 * XXX: They should be randomised. */
930 
931 	p = (uint8_t *)state->send + sizeof(*state->send);
932 	if (ifo->options & DHCPCD_ANONYMOUS)
933 		COPYIN(D6_OPTION_CLIENTID, duid,
934 		    (uint16_t)duid_len);
935 	else
936 		COPYIN(D6_OPTION_CLIENTID, ifp->ctx->duid,
937 		    (uint16_t)ifp->ctx->duid_len);
938 
939 	if (si != NULL)
940 		COPYIN(D6_OPTION_SERVERID, si, si_len);
941 
942 	for (l = 0; IA && l < ifo->ia_len; l++) {
943 		ifia = &ifo->ia[l];
944 		o_lenp = NEXTLEN;
945 		/* TA structure is the same as the others,
946 		 * it just lacks the T1 and T2 timers.
947 		 * These happen to be at the end of the struct,
948 		 * so we just don't copy them in. */
949 		if (ifia->ia_type == D6_OPTION_IA_TA)
950 			ia_na_len = sizeof(struct dhcp6_ia_ta);
951 		else
952 			ia_na_len = sizeof(ia_na);
953 		memcpy(ia_na.iaid, ifia->iaid, sizeof(ia_na.iaid));
954 		ia_na.t1 = 0;
955 		ia_na.t2 = 0;
956 		COPYIN(ifia->ia_type, &ia_na, ia_na_len);
957 		TAILQ_FOREACH(ap, &state->addrs, next) {
958 			if (ap->flags & IPV6_AF_STALE)
959 				continue;
960 			if (!(ap->flags & IPV6_AF_REQUEST) &&
961 			    (ap->prefix_vltime == 0 ||
962 			    state->state == DH6S_DISCOVER))
963 				continue;
964 			if (DECLINE_IA(ap) && state->state != DH6S_DECLINE)
965 				continue;
966 			if (ap->ia_type != ifia->ia_type)
967 				continue;
968 			if (memcmp(ap->iaid, ifia->iaid, sizeof(ap->iaid)))
969 				continue;
970 			if (ap->ia_type == D6_OPTION_IA_PD) {
971 #ifndef SMALL
972 				struct dhcp6_pd_addr pdp;
973 
974 				pdp.pltime = htonl(ap->prefix_pltime);
975 				pdp.vltime = htonl(ap->prefix_vltime);
976 				pdp.prefix_len = ap->prefix_len;
977 				/* pdp.prefix is not aligned, so copy it in. */
978 				memcpy(&pdp.prefix, &ap->prefix, sizeof(pdp.prefix));
979 				COPYIN(D6_OPTION_IAPREFIX, &pdp, sizeof(pdp));
980 				ia_na_len = (uint16_t)
981 				    (ia_na_len + sizeof(o) + sizeof(pdp));
982 
983 				/* RFC6603 Section 4.2 */
984 				if (ap->prefix_exclude_len) {
985 					uint8_t exb[16], *ep, u8;
986 					const uint8_t *pp;
987 
988 					n = (size_t)((ap->prefix_exclude_len -
989 					    ap->prefix_len - 1) / NBBY) + 1;
990 					ep = exb;
991 					*ep++ = (uint8_t)ap->prefix_exclude_len;
992 					pp = ap->prefix_exclude.s6_addr;
993 					pp += (size_t)
994 					    ((ap->prefix_len - 1) / NBBY) +
995 					    (n - 1);
996 					u8 = ap->prefix_len % NBBY;
997 					if (u8)
998 						n--;
999 					while (n-- > 0)
1000 						*ep++ = *pp--;
1001 					if (u8)
1002 						*ep = (uint8_t)(*pp << u8);
1003 					n++;
1004 					COPYIN(D6_OPTION_PD_EXCLUDE, exb,
1005 					    (uint16_t)n);
1006 					ia_na_len = (uint16_t)
1007 					    (ia_na_len + sizeof(o) + n);
1008 				}
1009 #endif
1010 			} else {
1011 				struct dhcp6_ia_addr ia;
1012 
1013 				ia.addr = ap->addr;
1014 				ia.pltime = htonl(ap->prefix_pltime);
1015 				ia.vltime = htonl(ap->prefix_vltime);
1016 				COPYIN(D6_OPTION_IA_ADDR, &ia, sizeof(ia));
1017 				ia_na_len = (uint16_t)
1018 				    (ia_na_len + sizeof(o) + sizeof(ia));
1019 			}
1020 		}
1021 
1022 		/* Update the total option lenth. */
1023 		ia_na_len = htons(ia_na_len);
1024 		memcpy(o_lenp, &ia_na_len, sizeof(ia_na_len));
1025 	}
1026 
1027 	if (state->send->type != DHCP6_RELEASE &&
1028 	    state->send->type != DHCP6_DECLINE &&
1029 	    n_options)
1030 	{
1031 		o_lenp = NEXTLEN;
1032 		o.len = 0;
1033 		COPYIN1(D6_OPTION_ORO, 0);
1034 		for (l = 0, opt = ifp->ctx->dhcp6_opts;
1035 		    l < ifp->ctx->dhcp6_opts_len;
1036 		    l++, opt++)
1037 		{
1038 #ifndef SMALL
1039 			for (n = 0, opt2 = ifo->dhcp6_override;
1040 			    n < ifo->dhcp6_override_len;
1041 			    n++, opt2++)
1042 			{
1043 				if (opt->option == opt2->option)
1044 					break;
1045 			}
1046 			if (n < ifo->dhcp6_override_len)
1047 			    continue;
1048 #endif
1049 			if (!DHC_REQOPT(opt, ifo->requestmask6, ifo->nomask6))
1050 				continue;
1051 			o.code = htons((uint16_t)opt->option);
1052 			memcpy(p, &o.code, sizeof(o.code));
1053 			p += sizeof(o.code);
1054 			o.len = (uint16_t)(o.len + sizeof(o.code));
1055 		}
1056 #ifndef SMALL
1057 		for (l = 0, opt = ifo->dhcp6_override;
1058 		    l < ifo->dhcp6_override_len;
1059 		    l++, opt++)
1060 		{
1061 			if (!DHC_REQOPT(opt, ifo->requestmask6, ifo->nomask6))
1062 				continue;
1063 			o.code = htons((uint16_t)opt->option);
1064 			memcpy(p, &o.code, sizeof(o.code));
1065 			p += sizeof(o.code);
1066 			o.len = (uint16_t)(o.len + sizeof(o.code));
1067 		}
1068 		if (dhcp6_findselfsla(ifp)) {
1069 			o.code = htons(D6_OPTION_PD_EXCLUDE);
1070 			memcpy(p, &o.code, sizeof(o.code));
1071 			p += sizeof(o.code);
1072 			o.len = (uint16_t)(o.len + sizeof(o.code));
1073 		}
1074 #endif
1075 		o.len = htons(o.len);
1076 		memcpy(o_lenp, &o.len, sizeof(o.len));
1077 	}
1078 
1079 	si_len = 0;
1080 	COPYIN(D6_OPTION_ELAPSED, &si_len, sizeof(si_len));
1081 
1082 	if (state->state == DH6S_DISCOVER &&
1083 	    !(ifp->ctx->options & DHCPCD_TEST) &&
1084 	    DHC_REQ(ifo->requestmask6, ifo->nomask6, D6_OPTION_RAPID_COMMIT))
1085 		COPYIN1(D6_OPTION_RAPID_COMMIT, 0);
1086 
1087 	if (!has_option_mask(ifo->nomask6, D6_OPTION_USER_CLASS))
1088 		p += dhcp6_makeuser(p, ifp);
1089 	if (!has_option_mask(ifo->nomask6, D6_OPTION_VENDOR_CLASS))
1090 		p += dhcp6_makevendor(p, ifp);
1091 
1092 	if (state->send->type != DHCP6_RELEASE &&
1093 	    state->send->type != DHCP6_DECLINE)
1094 	{
1095 		if (fqdn != FQDN_DISABLE) {
1096 			o_lenp = NEXTLEN;
1097 			COPYIN1(D6_OPTION_FQDN, 0);
1098 			if (hl == 0)
1099 				*p = D6_FQDN_NONE;
1100 			else {
1101 				switch (fqdn) {
1102 				case FQDN_BOTH:
1103 					*p = D6_FQDN_BOTH;
1104 					break;
1105 				case FQDN_PTR:
1106 					*p = D6_FQDN_PTR;
1107 					break;
1108 				default:
1109 					*p = D6_FQDN_NONE;
1110 					break;
1111 				}
1112 			}
1113 			p++;
1114 			encode_rfc1035(hostname, p);
1115 			p += hl;
1116 			o.len = htons((uint16_t)(hl + 1));
1117 			memcpy(o_lenp, &o.len, sizeof(o.len));
1118 		}
1119 
1120 		if (!has_option_mask(ifo->nomask6, D6_OPTION_MUDURL) &&
1121 		    ifo->mudurl[0])
1122 			COPYIN(D6_OPTION_MUDURL,
1123 			    ifo->mudurl + 1, ifo->mudurl[0]);
1124 
1125 #ifdef AUTH
1126 		if ((ifo->auth.options & DHCPCD_AUTH_SENDREQUIRE) !=
1127 		    DHCPCD_AUTH_SENDREQUIRE &&
1128 		    DHC_REQ(ifo->requestmask6, ifo->nomask6,
1129 		    D6_OPTION_RECONF_ACCEPT))
1130 			COPYIN1(D6_OPTION_RECONF_ACCEPT, 0);
1131 #endif
1132 
1133 	}
1134 
1135 #ifdef AUTH
1136 	/* This has to be the last option */
1137 	if (ifo->auth.options & DHCPCD_AUTH_SEND && auth_len != 0) {
1138 		COPYIN1(D6_OPTION_AUTH, auth_len);
1139 		/* data will be filled at send message time */
1140 	}
1141 #endif
1142 
1143 	return 0;
1144 }
1145 
1146 static const char *
1147 dhcp6_get_op(uint16_t type)
1148 {
1149 	const struct dhcp6_op *d;
1150 
1151 	for (d = dhcp6_ops; d->name; d++)
1152 		if (d->type == type)
1153 			return d->name;
1154 	return NULL;
1155 }
1156 
1157 static void
1158 dhcp6_freedrop_addrs(struct interface *ifp, int drop,
1159     const struct interface *ifd)
1160 {
1161 	struct dhcp6_state *state;
1162 
1163 	state = D6_STATE(ifp);
1164 	if (state) {
1165 		ipv6_freedrop_addrs(&state->addrs, drop, ifd);
1166 		if (drop)
1167 			rt_build(ifp->ctx, AF_INET6);
1168 	}
1169 }
1170 
1171 #ifndef SMALL
1172 static void dhcp6_delete_delegates(struct interface *ifp)
1173 {
1174 	struct interface *ifp0;
1175 
1176 	if (ifp->ctx->ifaces) {
1177 		TAILQ_FOREACH(ifp0, ifp->ctx->ifaces, next) {
1178 			if (ifp0 != ifp)
1179 				dhcp6_freedrop_addrs(ifp0, 1, ifp);
1180 		}
1181 	}
1182 }
1183 #endif
1184 
1185 #ifdef AUTH
1186 static ssize_t
1187 dhcp6_update_auth(struct interface *ifp, struct dhcp6_message *m, size_t len)
1188 {
1189 	struct dhcp6_state *state;
1190 	uint8_t *opt;
1191 	uint16_t opt_len;
1192 
1193 	opt = dhcp6_findmoption(m, len, D6_OPTION_AUTH, &opt_len);
1194 	if (opt == NULL)
1195 		return -1;
1196 
1197 	state = D6_STATE(ifp);
1198 	return dhcp_auth_encode(ifp->ctx, &ifp->options->auth,
1199 	    state->auth.token, (uint8_t *)state->send, state->send_len, 6,
1200 	    state->send->type, opt, opt_len);
1201 }
1202 #endif
1203 
1204 static const struct in6_addr alldhcp = IN6ADDR_LINKLOCAL_ALLDHCP_INIT;
1205 static int
1206 dhcp6_sendmessage(struct interface *ifp, void (*callback)(void *))
1207 {
1208 	struct dhcp6_state *state = D6_STATE(ifp);
1209 	struct dhcpcd_ctx *ctx = ifp->ctx;
1210 	unsigned int RT;
1211 	bool broadcast = true;
1212 	struct sockaddr_in6 dst = {
1213 	    .sin6_family = AF_INET6,
1214 	    /* Setting the port on Linux gives EINVAL when sending.
1215 	     * This looks like a kernel bug as the equivalent works
1216 	     * fine with the DHCP counterpart. */
1217 #ifndef __linux__
1218 	    .sin6_port = htons(DHCP6_SERVER_PORT),
1219 #endif
1220 	};
1221 	struct udphdr udp = {
1222 	    .uh_sport = htons(DHCP6_CLIENT_PORT),
1223 	    .uh_dport = htons(DHCP6_SERVER_PORT),
1224 	    .uh_ulen = htons((uint16_t)(sizeof(udp) + state->send_len)),
1225 	};
1226 	struct iovec iov[] = {
1227 	    { .iov_base = &udp, .iov_len = sizeof(udp), },
1228 	    { .iov_base = state->send, .iov_len = state->send_len, },
1229 	};
1230 	union {
1231 		struct cmsghdr hdr;
1232 		uint8_t buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
1233 	} cmsgbuf = { .buf = { 0 } };
1234 	struct msghdr msg = {
1235 	    .msg_name = &dst, .msg_namelen = sizeof(dst),
1236 	    .msg_iov = iov, .msg_iovlen = __arraycount(iov),
1237 	};
1238 	char uaddr[INET6_ADDRSTRLEN];
1239 
1240 	if (!callback && !if_is_link_up(ifp))
1241 		return 0;
1242 
1243 	if (!IN6_IS_ADDR_UNSPECIFIED(&state->unicast)) {
1244 		switch (state->send->type) {
1245 		case DHCP6_SOLICIT:	/* FALLTHROUGH */
1246 		case DHCP6_CONFIRM:	/* FALLTHROUGH */
1247 		case DHCP6_REBIND:
1248 			/* Unicasting is denied for these types. */
1249 			break;
1250 		default:
1251 			broadcast = false;
1252 			inet_ntop(AF_INET6, &state->unicast, uaddr,
1253 			    sizeof(uaddr));
1254 			break;
1255 		}
1256 	}
1257 	dst.sin6_addr = broadcast ? alldhcp : state->unicast;
1258 
1259 	if (!callback) {
1260 		logdebugx("%s: %s %s with xid 0x%02x%02x%02x%s%s",
1261 		    ifp->name,
1262 		    broadcast ? "broadcasting" : "unicasting",
1263 		    dhcp6_get_op(state->send->type),
1264 		    state->send->xid[0],
1265 		    state->send->xid[1],
1266 		    state->send->xid[2],
1267 		    !broadcast ? " " : "",
1268 		    !broadcast ? uaddr : "");
1269 		RT = 0;
1270 	} else {
1271 		if (state->IMD &&
1272 		    !(ifp->options->options & DHCPCD_INITIAL_DELAY))
1273 			state->IMD = 0;
1274 		if (state->IMD) {
1275 			state->RT = state->IMD * MSEC_PER_SEC;
1276 			/* Some buggy PPP servers close the link too early
1277 			 * after sending an invalid status in their reply
1278 			 * which means this host won't see it.
1279 			 * 1 second grace seems to be the sweet spot. */
1280 			if (ifp->flags & IFF_POINTOPOINT)
1281 				state->RT += MSEC_PER_SEC;
1282 		} else if (state->RTC == 0)
1283 			state->RT = state->IRT * MSEC_PER_SEC;
1284 
1285 		if (state->MRT != 0) {
1286 			unsigned int mrt = state->MRT * MSEC_PER_SEC;
1287 
1288 			if (state->RT > mrt)
1289 				state->RT = mrt;
1290 		}
1291 
1292 		/* Add -.1 to .1 * RT randomness as per RFC8415 section 15 */
1293 		uint32_t lru = arc4random_uniform(
1294 		    state->RTC == 0 ? DHCP6_RAND_MAX
1295 		    : DHCP6_RAND_MAX - DHCP6_RAND_MIN);
1296 		int lr = (int)lru - (state->RTC == 0 ? 0 : DHCP6_RAND_MAX);
1297 		RT = state->RT
1298 		    + (unsigned int)((float)state->RT
1299 		    * ((float)lr / DHCP6_RAND_DIV));
1300 
1301 		if (if_is_link_up(ifp))
1302 			logdebugx("%s: %s %s (xid 0x%02x%02x%02x)%s%s,"
1303 			    " next in %0.1f seconds",
1304 			    ifp->name,
1305 			    state->IMD != 0 ? "delaying" :
1306 			    broadcast ? "broadcasting" : "unicasting",
1307 			    dhcp6_get_op(state->send->type),
1308 			    state->send->xid[0],
1309 			    state->send->xid[1],
1310 			    state->send->xid[2],
1311 			    state->IMD == 0 && !broadcast ? " " : "",
1312 			    state->IMD == 0 && !broadcast ? uaddr : "",
1313 			    (float)RT / MSEC_PER_SEC);
1314 
1315 		/* Wait the initial delay */
1316 		if (state->IMD != 0) {
1317 			state->IMD = 0;
1318 			eloop_timeout_add_msec(ctx->eloop, RT, callback, ifp);
1319 			return 0;
1320 		}
1321 	}
1322 
1323 	if (!if_is_link_up(ifp))
1324 		return 0;
1325 
1326 	/* Update the elapsed time */
1327 	dhcp6_updateelapsed(ifp, state->send, state->send_len);
1328 #ifdef AUTH
1329 	if (ifp->options->auth.options & DHCPCD_AUTH_SEND &&
1330 	    dhcp6_update_auth(ifp, state->send, state->send_len) == -1)
1331 	{
1332 		logerr("%s: %s: dhcp6_updateauth", __func__, ifp->name);
1333 		if (errno != ESRCH)
1334 			return -1;
1335 	}
1336 #endif
1337 
1338 	/* Set the outbound interface */
1339 	if (broadcast) {
1340 		struct cmsghdr *cm;
1341 		struct in6_pktinfo pi = { .ipi6_ifindex = ifp->index };
1342 
1343 		dst.sin6_scope_id = ifp->index;
1344 		msg.msg_control = cmsgbuf.buf;
1345 		msg.msg_controllen = sizeof(cmsgbuf.buf);
1346 		cm = CMSG_FIRSTHDR(&msg);
1347 		if (cm == NULL) /* unlikely */
1348 			return -1;
1349 		cm->cmsg_level = IPPROTO_IPV6;
1350 		cm->cmsg_type = IPV6_PKTINFO;
1351 		cm->cmsg_len = CMSG_LEN(sizeof(pi));
1352 		memcpy(CMSG_DATA(cm), &pi, sizeof(pi));
1353 	}
1354 
1355 #ifdef PRIVSEP
1356 	if (IN_PRIVSEP(ifp->ctx)) {
1357 		if (ps_inet_senddhcp6(ifp, &msg) == -1)
1358 			logerr(__func__);
1359 		goto sent;
1360 	}
1361 #endif
1362 
1363 	if (sendmsg(ctx->dhcp6_wfd, &msg, 0) == -1) {
1364 		logerr("%s: %s: sendmsg", __func__, ifp->name);
1365 		/* Allow DHCPv6 to continue .... the errors
1366 		 * would be rate limited by the protocol.
1367 		 * Generally the error is ENOBUFS when struggling to
1368 		 * associate with an access point. */
1369 	}
1370 
1371 #ifdef PRIVSEP
1372 sent:
1373 #endif
1374 	state->RTC++;
1375 	if (callback) {
1376 		state->RT = RT * 2;
1377 		if (state->RT < RT) /* Check overflow */
1378 			state->RT = RT;
1379 		if (state->MRC == 0 || state->RTC < state->MRC)
1380 			eloop_timeout_add_msec(ctx->eloop,
1381 			    RT, callback, ifp);
1382 		else if (state->MRC != 0 && state->MRCcallback)
1383 			eloop_timeout_add_msec(ctx->eloop,
1384 			    RT, state->MRCcallback, ifp);
1385 		else
1386 			logwarnx("%s: sent %d times with no reply",
1387 			    ifp->name, state->RTC);
1388 	}
1389 	return 0;
1390 }
1391 
1392 static void
1393 dhcp6_sendinform(void *arg)
1394 {
1395 
1396 	dhcp6_sendmessage(arg, dhcp6_sendinform);
1397 }
1398 
1399 static void
1400 dhcp6_senddiscover(void *arg)
1401 {
1402 
1403 	dhcp6_sendmessage(arg, dhcp6_senddiscover);
1404 }
1405 
1406 static void
1407 dhcp6_sendrequest(void *arg)
1408 {
1409 
1410 	dhcp6_sendmessage(arg, dhcp6_sendrequest);
1411 }
1412 
1413 static void
1414 dhcp6_sendrebind(void *arg)
1415 {
1416 
1417 	dhcp6_sendmessage(arg, dhcp6_sendrebind);
1418 }
1419 
1420 static void
1421 dhcp6_sendrenew(void *arg)
1422 {
1423 
1424 	dhcp6_sendmessage(arg, dhcp6_sendrenew);
1425 }
1426 
1427 static void
1428 dhcp6_sendconfirm(void *arg)
1429 {
1430 
1431 	dhcp6_sendmessage(arg, dhcp6_sendconfirm);
1432 }
1433 
1434 static void
1435 dhcp6_senddecline(void *arg)
1436 {
1437 
1438 	dhcp6_sendmessage(arg, dhcp6_senddecline);
1439 }
1440 
1441 static void
1442 dhcp6_sendrelease(void *arg)
1443 {
1444 
1445 	dhcp6_sendmessage(arg, dhcp6_sendrelease);
1446 }
1447 
1448 static void
1449 dhcp6_startrenew(void *arg)
1450 {
1451 	struct interface *ifp;
1452 	struct dhcp6_state *state;
1453 
1454 	ifp = arg;
1455 	if ((state = D6_STATE(ifp)) == NULL)
1456 		return;
1457 
1458 	/* Only renew in the bound or renew states */
1459 	if (state->state != DH6S_BOUND &&
1460 	    state->state != DH6S_RENEW)
1461 		return;
1462 
1463 	/* Remove the timeout as the renew may have been forced. */
1464 	eloop_timeout_delete(ifp->ctx->eloop, dhcp6_startrenew, ifp);
1465 
1466 	state->state = DH6S_RENEW;
1467 	state->RTC = 0;
1468 	state->IMD = REN_MAX_DELAY;
1469 	state->IRT = REN_TIMEOUT;
1470 	state->MRT = REN_MAX_RT;
1471 	state->MRC = 0;
1472 
1473 	if (dhcp6_makemessage(ifp) == -1)
1474 		logerr("%s: %s", __func__, ifp->name);
1475 	else
1476 		dhcp6_sendrenew(ifp);
1477 }
1478 
1479 void dhcp6_renew(struct interface *ifp)
1480 {
1481 
1482 	dhcp6_startrenew(ifp);
1483 }
1484 
1485 bool
1486 dhcp6_dadcompleted(const struct interface *ifp)
1487 {
1488 	const struct dhcp6_state *state;
1489 	const struct ipv6_addr *ap;
1490 
1491 	state = D6_CSTATE(ifp);
1492 	TAILQ_FOREACH(ap, &state->addrs, next) {
1493 		if (ap->flags & IPV6_AF_ADDED &&
1494 		    !(ap->flags & IPV6_AF_DADCOMPLETED))
1495 			return false;
1496 	}
1497 	return true;
1498 }
1499 
1500 static void
1501 dhcp6_dadcallback(void *arg)
1502 {
1503 	struct ipv6_addr *ia = arg;
1504 	struct interface *ifp;
1505 	struct dhcp6_state *state;
1506 	struct ipv6_addr *ia2;
1507 	bool completed, valid, oneduplicated;
1508 
1509 	completed = (ia->flags & IPV6_AF_DADCOMPLETED);
1510 	ia->flags |= IPV6_AF_DADCOMPLETED;
1511 	if (ia->addr_flags & IN6_IFF_DUPLICATED)
1512 		logwarnx("%s: DAD detected %s", ia->iface->name, ia->saddr);
1513 
1514 #ifdef ND6_ADVERTISE
1515 	else
1516 		ipv6nd_advertise(ia);
1517 #endif
1518 	if (completed)
1519 		return;
1520 
1521 	ifp = ia->iface;
1522 	state = D6_STATE(ifp);
1523 	if (state->state != DH6S_BOUND && state->state != DH6S_DELEGATED)
1524 		return;
1525 
1526 #ifdef SMALL
1527 	valid = true;
1528 #else
1529 	valid = (ia->delegating_prefix == NULL);
1530 #endif
1531 	completed = true;
1532 	oneduplicated = false;
1533 	TAILQ_FOREACH(ia2, &state->addrs, next) {
1534 		if (ia2->flags & IPV6_AF_ADDED &&
1535 		    !(ia2->flags & IPV6_AF_DADCOMPLETED))
1536 		{
1537 			completed = false;
1538 			break;
1539 		}
1540 		if (DECLINE_IA(ia))
1541 			oneduplicated = true;
1542 	}
1543 	if (!completed)
1544 		return;
1545 
1546 	logdebugx("%s: DHCPv6 DAD completed", ifp->name);
1547 
1548 	if (oneduplicated && state->state == DH6S_BOUND) {
1549 		dhcp6_startdecline(ifp);
1550 		return;
1551 	}
1552 
1553 	script_runreason(ifp,
1554 #ifndef SMALL
1555 	    ia->delegating_prefix ? "DELEGATED6" :
1556 #endif
1557 	    state->reason);
1558 	if (valid)
1559 		dhcpcd_daemonise(ifp->ctx);
1560 }
1561 
1562 static void
1563 dhcp6_addrequestedaddrs(struct interface *ifp)
1564 {
1565 	struct dhcp6_state *state;
1566 	size_t i;
1567 	struct if_ia *ia;
1568 	struct ipv6_addr *a;
1569 
1570 	state = D6_STATE(ifp);
1571 	/* Add any requested prefixes / addresses */
1572 	for (i = 0; i < ifp->options->ia_len; i++) {
1573 		ia = &ifp->options->ia[i];
1574 		if (!((ia->ia_type == D6_OPTION_IA_PD && ia->prefix_len) ||
1575 		    !IN6_IS_ADDR_UNSPECIFIED(&ia->addr)))
1576 			continue;
1577 		a = ipv6_newaddr(ifp, &ia->addr,
1578 			/*
1579 			 * RFC 5942 Section 5
1580 			 * We cannot assume any prefix length, nor tie the
1581 			 * address to an existing one as it could expire
1582 			 * before the address.
1583 			 * As such we just give it a 128 prefix.
1584 			 */
1585 		    ia->ia_type == D6_OPTION_IA_PD ? ia->prefix_len : 128,
1586 		    IPV6_AF_REQUEST);
1587 		if (a == NULL)
1588 			continue;
1589 		a->dadcallback = dhcp6_dadcallback;
1590 		memcpy(&a->iaid, &ia->iaid, sizeof(a->iaid));
1591 		a->ia_type = ia->ia_type;
1592 		TAILQ_INSERT_TAIL(&state->addrs, a, next);
1593 	}
1594 }
1595 
1596 static void
1597 dhcp6_startdiscover(void *arg)
1598 {
1599 	struct interface *ifp;
1600 	struct dhcp6_state *state;
1601 	int llevel;
1602 
1603 	ifp = arg;
1604 	state = D6_STATE(ifp);
1605 #ifndef SMALL
1606 	if (state->reason == NULL || strcmp(state->reason, "TIMEOUT6") != 0)
1607 		dhcp6_delete_delegates(ifp);
1608 #endif
1609 	if (state->new == NULL && !state->failed)
1610 		llevel = LOG_INFO;
1611 	else
1612 		llevel = LOG_DEBUG;
1613 	logmessage(llevel, "%s: soliciting a DHCPv6 lease", ifp->name);
1614 	state->state = DH6S_DISCOVER;
1615 	state->RTC = 0;
1616 	state->IMD = SOL_MAX_DELAY;
1617 	state->IRT = SOL_TIMEOUT;
1618 	state->MRT = state->sol_max_rt;
1619 	state->MRC = SOL_MAX_RC;
1620 
1621 	eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp);
1622 	free(state->new);
1623 	state->new = NULL;
1624 	state->new_len = 0;
1625 
1626 	if (dhcp6_makemessage(ifp) == -1)
1627 		logerr("%s: %s", __func__, ifp->name);
1628 	else
1629 		dhcp6_senddiscover(ifp);
1630 }
1631 
1632 static void
1633 dhcp6_startinform(void *arg)
1634 {
1635 	struct interface *ifp;
1636 	struct dhcp6_state *state;
1637 	int llevel;
1638 
1639 	ifp = arg;
1640 	state = D6_STATE(ifp);
1641 	if (state->new == NULL && !state->failed)
1642 		llevel = LOG_INFO;
1643 	else
1644 		llevel = LOG_DEBUG;
1645 	logmessage(llevel, "%s: requesting DHCPv6 information", ifp->name);
1646 	state->state = DH6S_INFORM;
1647 	state->RTC = 0;
1648 	state->IMD = INF_MAX_DELAY;
1649 	state->IRT = INF_TIMEOUT;
1650 	state->MRT = state->inf_max_rt;
1651 	state->MRC = 0;
1652 
1653 	eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp);
1654 	if (dhcp6_makemessage(ifp) == -1) {
1655 		logerr("%s: %s", __func__, ifp->name);
1656 		return;
1657 	}
1658 	dhcp6_sendinform(ifp);
1659 	/* RFC3315 18.1.2 says that if CONFIRM failed then the prior addresses
1660 	 * SHOULD be used. The wording here is poor, because the addresses are
1661 	 * merely one facet of the lease as a whole.
1662 	 * This poor wording might explain the lack of similar text for INFORM
1663 	 * in 18.1.5 because there are no addresses in the INFORM message. */
1664 	eloop_timeout_add_sec(ifp->ctx->eloop,
1665 	    INF_MAX_RD, dhcp6_failinform, ifp);
1666 }
1667 
1668 static bool
1669 dhcp6_startdiscoinform(struct interface *ifp)
1670 {
1671 	unsigned long long opts = ifp->options->options;
1672 
1673 	if (opts & DHCPCD_IA_FORCED || ipv6nd_hasradhcp(ifp, true))
1674 		dhcp6_startdiscover(ifp);
1675 	else if (opts & DHCPCD_INFORM6 || ipv6nd_hasradhcp(ifp, false))
1676 		dhcp6_startinform(ifp);
1677 	else
1678 		return false;
1679 	return true;
1680 }
1681 
1682 static void
1683 dhcp6_leaseextend(struct interface *ifp)
1684 {
1685 	struct dhcp6_state *state = D6_STATE(ifp);
1686 	struct ipv6_addr *ia;
1687 
1688 	logwarnx("%s: extending DHCPv6 lease", ifp->name);
1689 	TAILQ_FOREACH(ia, &state->addrs, next) {
1690 		ia->flags |= IPV6_AF_EXTENDED;
1691 		/* Set infinite lifetimes. */
1692 		ia->prefix_pltime = ND6_INFINITE_LIFETIME;
1693 		ia->prefix_vltime = ND6_INFINITE_LIFETIME;
1694 	}
1695 }
1696 
1697 static void
1698 dhcp6_fail(struct interface *ifp)
1699 {
1700 	struct dhcp6_state *state = D6_STATE(ifp);
1701 
1702 	state->failed = true;
1703 
1704 	/* RFC3315 18.1.2 says that prior addresses SHOULD be used on failure.
1705 	 * RFC2131 3.2.3 says that MAY chose to use the prior address.
1706 	 * Because dhcpcd was written first for RFC2131, we have the LASTLEASE
1707 	 * option which defaults to off as that makes the most sense for
1708 	 * mobile clients.
1709 	 * dhcpcd also has LASTLEASE_EXTEND to extend this lease past it's
1710 	 * expiry, but this is strictly not RFC compliant in any way or form. */
1711 	if (state->new != NULL &&
1712 	    ifp->options->options & DHCPCD_LASTLEASE_EXTEND)
1713 	{
1714 		dhcp6_leaseextend(ifp);
1715 		dhcp6_bind(ifp, NULL, NULL);
1716 	} else {
1717 		dhcp6_freedrop_addrs(ifp, 1, NULL);
1718 #ifndef SMALL
1719 		dhcp6_delete_delegates(ifp);
1720 #endif
1721 		free(state->old);
1722 		state->old = state->new;
1723 		state->old_len = state->new_len;
1724 		state->new = NULL;
1725 		state->new_len = 0;
1726 		if (state->old != NULL)
1727 			script_runreason(ifp, "EXPIRE6");
1728 		dhcp_unlink(ifp->ctx, state->leasefile);
1729 		dhcp6_addrequestedaddrs(ifp);
1730 	}
1731 
1732 	if (!dhcp6_startdiscoinform(ifp)) {
1733 		logwarnx("%s: no advertising IPv6 router wants DHCP",ifp->name);
1734 		state->state = DH6S_INIT;
1735 		eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp);
1736 	}
1737 }
1738 
1739 static int
1740 dhcp6_failloglevel(struct interface *ifp)
1741 {
1742 	const struct dhcp6_state *state = D6_CSTATE(ifp);
1743 
1744 	return state->failed ? LOG_DEBUG : LOG_ERR;
1745 }
1746 
1747 static void
1748 dhcp6_failconfirm(void *arg)
1749 {
1750 	struct interface *ifp = arg;
1751 	int llevel = dhcp6_failloglevel(ifp);
1752 
1753 	logmessage(llevel, "%s: failed to confirm prior DHCPv6 address",
1754 	    ifp->name);
1755 	dhcp6_fail(ifp);
1756 }
1757 
1758 static void
1759 dhcp6_failrequest(void *arg)
1760 {
1761 	struct interface *ifp = arg;
1762 	int llevel = dhcp6_failloglevel(ifp);
1763 
1764 	logmessage(llevel, "%s: failed to request DHCPv6 address", ifp->name);
1765 	dhcp6_fail(ifp);
1766 }
1767 
1768 static void
1769 dhcp6_failinform(void *arg)
1770 {
1771 	struct interface *ifp = arg;
1772 	int llevel = dhcp6_failloglevel(ifp);
1773 
1774 	logmessage(llevel, "%s: failed to request DHCPv6 information",
1775 	    ifp->name);
1776 	dhcp6_fail(ifp);
1777 }
1778 
1779 #ifndef SMALL
1780 static void
1781 dhcp6_failrebind(void *arg)
1782 {
1783 	struct interface *ifp = arg;
1784 
1785 	logerrx("%s: failed to rebind prior DHCPv6 delegation", ifp->name);
1786 	dhcp6_fail(ifp);
1787 }
1788 
1789 static int
1790 dhcp6_hasprefixdelegation(struct interface *ifp)
1791 {
1792 	size_t i;
1793 	uint16_t t;
1794 
1795 	t = 0;
1796 	for (i = 0; i < ifp->options->ia_len; i++) {
1797 		if (t && t != ifp->options->ia[i].ia_type) {
1798 			if (t == D6_OPTION_IA_PD ||
1799 			    ifp->options->ia[i].ia_type == D6_OPTION_IA_PD)
1800 				return 2;
1801 		}
1802 		t = ifp->options->ia[i].ia_type;
1803 	}
1804 	return t == D6_OPTION_IA_PD ? 1 : 0;
1805 }
1806 #endif
1807 
1808 static void
1809 dhcp6_startrebind(void *arg)
1810 {
1811 	struct interface *ifp;
1812 	struct dhcp6_state *state;
1813 #ifndef SMALL
1814 	int pd;
1815 #endif
1816 
1817 	ifp = arg;
1818 	eloop_timeout_delete(ifp->ctx->eloop, dhcp6_sendrenew, ifp);
1819 	state = D6_STATE(ifp);
1820 	if (state->state == DH6S_RENEW)
1821 		logwarnx("%s: failed to renew DHCPv6, rebinding", ifp->name);
1822 	else
1823 		loginfox("%s: rebinding prior DHCPv6 lease", ifp->name);
1824 	state->state = DH6S_REBIND;
1825 	state->RTC = 0;
1826 	state->MRC = 0;
1827 
1828 #ifndef SMALL
1829 	/* RFC 3633 section 12.1 */
1830 	pd = dhcp6_hasprefixdelegation(ifp);
1831 	if (pd) {
1832 		state->IMD = CNF_MAX_DELAY;
1833 		state->IRT = CNF_TIMEOUT;
1834 		state->MRT = CNF_MAX_RT;
1835 	} else
1836 #endif
1837 	{
1838 		state->IMD = REB_MAX_DELAY;
1839 		state->IRT = REB_TIMEOUT;
1840 		state->MRT = REB_MAX_RT;
1841 	}
1842 
1843 	if (dhcp6_makemessage(ifp) == -1)
1844 		logerr("%s: %s", __func__, ifp->name);
1845 	else
1846 		dhcp6_sendrebind(ifp);
1847 
1848 #ifndef SMALL
1849 	/* RFC 3633 section 12.1 */
1850 	if (pd)
1851 		eloop_timeout_add_sec(ifp->ctx->eloop,
1852 		    CNF_MAX_RD, dhcp6_failrebind, ifp);
1853 #endif
1854 }
1855 
1856 
1857 static void
1858 dhcp6_startrequest(struct interface *ifp)
1859 {
1860 	struct dhcp6_state *state;
1861 
1862 	eloop_timeout_delete(ifp->ctx->eloop, dhcp6_senddiscover, ifp);
1863 	state = D6_STATE(ifp);
1864 	state->state = DH6S_REQUEST;
1865 	state->RTC = 0;
1866 	state->IMD = 0;
1867 	state->IRT = REQ_TIMEOUT;
1868 	state->MRT = REQ_MAX_RT;
1869 	state->MRC = REQ_MAX_RC;
1870 	state->MRCcallback = dhcp6_failrequest;
1871 
1872 	if (dhcp6_makemessage(ifp) == -1) {
1873 		logerr("%s: %s", __func__, ifp->name);
1874 		return;
1875 	}
1876 
1877 	dhcp6_sendrequest(ifp);
1878 }
1879 
1880 static void
1881 dhcp6_startconfirm(struct interface *ifp)
1882 {
1883 	struct dhcp6_state *state;
1884 	struct ipv6_addr *ia;
1885 
1886 	state = D6_STATE(ifp);
1887 
1888 	TAILQ_FOREACH(ia, &state->addrs, next) {
1889 		if (!DECLINE_IA(ia))
1890 			continue;
1891 		logerrx("%s: prior DHCPv6 has a duplicated address", ifp->name);
1892 		dhcp6_startdecline(ifp);
1893 		return;
1894 	}
1895 
1896 	state->state = DH6S_CONFIRM;
1897 	state->RTC = 0;
1898 	state->IMD = CNF_MAX_DELAY;
1899 	state->IRT = CNF_TIMEOUT;
1900 	state->MRT = CNF_MAX_RT;
1901 	state->MRC = CNF_MAX_RC;
1902 
1903 	loginfox("%s: confirming prior DHCPv6 lease", ifp->name);
1904 
1905 	if (dhcp6_makemessage(ifp) == -1) {
1906 		logerr("%s: %s", __func__, ifp->name);
1907 		return;
1908 	}
1909 	dhcp6_sendconfirm(ifp);
1910 	eloop_timeout_add_sec(ifp->ctx->eloop,
1911 	    CNF_MAX_RD, dhcp6_failconfirm, ifp);
1912 }
1913 
1914 static void
1915 dhcp6_startexpire(void *arg)
1916 {
1917 	struct interface *ifp;
1918 
1919 	ifp = arg;
1920 	eloop_timeout_delete(ifp->ctx->eloop, dhcp6_sendrebind, ifp);
1921 
1922 	logerrx("%s: DHCPv6 lease expired", ifp->name);
1923 	dhcp6_fail(ifp);
1924 }
1925 
1926 static void
1927 dhcp6_faildecline(void *arg)
1928 {
1929 	struct interface *ifp = arg;
1930 
1931 	logerrx("%s: failed to decline duplicated DHCPv6 addresses", ifp->name);
1932 	dhcp6_fail(ifp);
1933 }
1934 
1935 static void
1936 dhcp6_startdecline(struct interface *ifp)
1937 {
1938 	struct dhcp6_state *state;
1939 
1940 	state = D6_STATE(ifp);
1941 	loginfox("%s: declining failed DHCPv6 addresses", ifp->name);
1942 	state->state = DH6S_DECLINE;
1943 	state->RTC = 0;
1944 	state->IMD = 0;
1945 	state->IRT = DEC_TIMEOUT;
1946 	state->MRT = 0;
1947 	state->MRC = DEC_MAX_RC;
1948 	state->MRCcallback = dhcp6_faildecline;
1949 
1950 	if (dhcp6_makemessage(ifp) == -1)
1951 		logerr("%s: %s", __func__, ifp->name);
1952 	else
1953 		dhcp6_senddecline(ifp);
1954 }
1955 
1956 static void
1957 dhcp6_finishrelease(void *arg)
1958 {
1959 	struct interface *ifp;
1960 	struct dhcp6_state *state;
1961 
1962 	ifp = (struct interface *)arg;
1963 	if ((state = D6_STATE(ifp)) != NULL) {
1964 		state->state = DH6S_RELEASED;
1965 		dhcp6_drop(ifp, "RELEASE6");
1966 	}
1967 }
1968 
1969 static void
1970 dhcp6_startrelease(struct interface *ifp)
1971 {
1972 	struct dhcp6_state *state;
1973 
1974 	state = D6_STATE(ifp);
1975 	if (state->state != DH6S_BOUND)
1976 		return;
1977 
1978 	state->state = DH6S_RELEASE;
1979 	state->RTC = 0;
1980 	state->IMD = REL_MAX_DELAY;
1981 	state->IRT = REL_TIMEOUT;
1982 	state->MRT = REL_MAX_RT;
1983 	/* MRC of REL_MAX_RC is optional in RFC 3315 18.1.6 */
1984 #if 0
1985 	state->MRC = REL_MAX_RC;
1986 	state->MRCcallback = dhcp6_finishrelease;
1987 #else
1988 	state->MRC = 0;
1989 	state->MRCcallback = NULL;
1990 #endif
1991 
1992 	if (dhcp6_makemessage(ifp) == -1)
1993 		logerr("%s: %s", __func__, ifp->name);
1994 	else {
1995 		dhcp6_sendrelease(ifp);
1996 		dhcp6_finishrelease(ifp);
1997 	}
1998 }
1999 
2000 static int
2001 dhcp6_checkstatusok(const struct interface *ifp,
2002     struct dhcp6_message *m, uint8_t *p, size_t len)
2003 {
2004 	struct dhcp6_state *state;
2005 	uint8_t *opt;
2006 	uint16_t opt_len, code;
2007 	size_t mlen;
2008 	void * (*f)(void *, size_t, uint16_t, uint16_t *), *farg;
2009 	char buf[32], *sbuf;
2010 	const char *status;
2011 	int loglevel;
2012 
2013 	state = D6_STATE(ifp);
2014 	f = p ? dhcp6_findoption : dhcp6_findmoption;
2015 	if (p)
2016 		farg = p;
2017 	else
2018 		farg = m;
2019 	if ((opt = f(farg, len, D6_OPTION_STATUS_CODE, &opt_len)) == NULL) {
2020 		//logdebugx("%s: no status", ifp->name);
2021 		state->lerror = 0;
2022 		errno = ESRCH;
2023 		return 0;
2024 	}
2025 
2026 	if (opt_len < sizeof(code)) {
2027 		logerrx("%s: status truncated", ifp->name);
2028 		return -1;
2029 	}
2030 	memcpy(&code, opt, sizeof(code));
2031 	code = ntohs(code);
2032 	if (code == D6_STATUS_OK) {
2033 		state->lerror = 0;
2034 		errno = 0;
2035 		return 0;
2036 	}
2037 
2038 	/* Anything after the code is a message. */
2039 	opt += sizeof(code);
2040 	mlen = opt_len - sizeof(code);
2041 	if (mlen == 0) {
2042 		sbuf = NULL;
2043 		if (code < sizeof(dhcp6_statuses) / sizeof(char *))
2044 			status = dhcp6_statuses[code];
2045 		else {
2046 			snprintf(buf, sizeof(buf), "Unknown Status (%d)", code);
2047 			status = buf;
2048 		}
2049 	} else {
2050 		if ((sbuf = malloc(mlen + 1)) == NULL) {
2051 			logerr(__func__);
2052 			return -1;
2053 		}
2054 		memcpy(sbuf, opt, mlen);
2055 		sbuf[mlen] = '\0';
2056 		status = sbuf;
2057 	}
2058 
2059 	if (state->lerror == code || state->state == DH6S_INIT)
2060 		loglevel = LOG_DEBUG;
2061 	else
2062 		loglevel = LOG_ERR;
2063 	logmessage(loglevel, "%s: DHCPv6 REPLY: %s", ifp->name, status);
2064 	free(sbuf);
2065 	state->lerror = code;
2066 	errno = 0;
2067 
2068 	if (code != 0 && ifp->ctx->options & DHCPCD_TEST)
2069 		eloop_exit(ifp->ctx->eloop, EXIT_FAILURE);
2070 
2071 	return (int)code;
2072 }
2073 
2074 const struct ipv6_addr *
2075 dhcp6_iffindaddr(const struct interface *ifp, const struct in6_addr *addr,
2076     unsigned int flags)
2077 {
2078 	const struct dhcp6_state *state;
2079 	const struct ipv6_addr *ap;
2080 
2081 	if ((state = D6_STATE(ifp)) != NULL) {
2082 		TAILQ_FOREACH(ap, &state->addrs, next) {
2083 			if (ipv6_findaddrmatch(ap, addr, flags))
2084 				return ap;
2085 		}
2086 	}
2087 	return NULL;
2088 }
2089 
2090 struct ipv6_addr *
2091 dhcp6_findaddr(struct dhcpcd_ctx *ctx, const struct in6_addr *addr,
2092     unsigned int flags)
2093 {
2094 	struct interface *ifp;
2095 	struct ipv6_addr *ap;
2096 	struct dhcp6_state *state;
2097 
2098 	TAILQ_FOREACH(ifp, ctx->ifaces, next) {
2099 		if ((state = D6_STATE(ifp)) != NULL) {
2100 			TAILQ_FOREACH(ap, &state->addrs, next) {
2101 				if (ipv6_findaddrmatch(ap, addr, flags))
2102 					return ap;
2103 			}
2104 		}
2105 	}
2106 	return NULL;
2107 }
2108 
2109 static int
2110 dhcp6_findna(struct interface *ifp, uint16_t ot, const uint8_t *iaid,
2111     uint8_t *d, size_t l, const struct timespec *acquired)
2112 {
2113 	struct dhcp6_state *state;
2114 	uint8_t *o, *nd;
2115 	uint16_t ol;
2116 	struct ipv6_addr *a;
2117 	int i;
2118 	struct dhcp6_ia_addr ia;
2119 
2120 	i = 0;
2121 	state = D6_STATE(ifp);
2122 	while ((o = dhcp6_findoption(d, l, D6_OPTION_IA_ADDR, &ol))) {
2123 		/* Set d and l first to ensure we find the next option. */
2124 		nd = o + ol;
2125 		l -= (size_t)(nd - d);
2126 		d = nd;
2127 		if (ol < sizeof(ia)) {
2128 			errno = EINVAL;
2129 			logerrx("%s: IA Address option truncated", ifp->name);
2130 			continue;
2131 		}
2132 		memcpy(&ia, o, sizeof(ia));
2133 		ia.pltime = ntohl(ia.pltime);
2134 		ia.vltime = ntohl(ia.vltime);
2135 		/* RFC 3315 22.6 */
2136 		if (ia.pltime > ia.vltime) {
2137 			errno = EINVAL;
2138 			logerr("%s: IA Address pltime %"PRIu32
2139 			    " > vltime %"PRIu32,
2140 			    ifp->name, ia.pltime, ia.vltime);
2141 			continue;
2142 		}
2143 		TAILQ_FOREACH(a, &state->addrs, next) {
2144 			if (ipv6_findaddrmatch(a, &ia.addr, 0))
2145 				break;
2146 		}
2147 		if (a == NULL) {
2148 			/*
2149 			 * RFC 5942 Section 5
2150 			 * We cannot assume any prefix length, nor tie the
2151 			 * address to an existing one as it could expire
2152 			 * before the address.
2153 			 * As such we just give it a 128 prefix.
2154 			 */
2155 			a = ipv6_newaddr(ifp, &ia.addr, 128, IPV6_AF_ONLINK);
2156 			a->dadcallback = dhcp6_dadcallback;
2157 			a->ia_type = ot;
2158 			memcpy(a->iaid, iaid, sizeof(a->iaid));
2159 			a->created = *acquired;
2160 
2161 			TAILQ_INSERT_TAIL(&state->addrs, a, next);
2162 		} else {
2163 			if (!(a->flags & IPV6_AF_ONLINK))
2164 				a->flags |= IPV6_AF_ONLINK | IPV6_AF_NEW;
2165 			a->flags &= ~(IPV6_AF_STALE | IPV6_AF_EXTENDED);
2166 		}
2167 		a->acquired = *acquired;
2168 		a->prefix_pltime = ia.pltime;
2169 		if (a->prefix_vltime != ia.vltime) {
2170 			a->flags |= IPV6_AF_NEW;
2171 			a->prefix_vltime = ia.vltime;
2172 		}
2173 		if (a->prefix_pltime && a->prefix_pltime < state->lowpl)
2174 		    state->lowpl = a->prefix_pltime;
2175 		if (a->prefix_vltime && a->prefix_vltime > state->expire)
2176 		    state->expire = a->prefix_vltime;
2177 		i++;
2178 	}
2179 	return i;
2180 }
2181 
2182 #ifndef SMALL
2183 static int
2184 dhcp6_findpd(struct interface *ifp, const uint8_t *iaid,
2185     uint8_t *d, size_t l, const struct timespec *acquired)
2186 {
2187 	struct dhcp6_state *state;
2188 	uint8_t *o, *nd;
2189 	struct ipv6_addr *a;
2190 	int i;
2191 	uint8_t nb, *pw;
2192 	uint16_t ol;
2193 	struct dhcp6_pd_addr pdp;
2194 	struct in6_addr pdp_prefix;
2195 
2196 	i = 0;
2197 	state = D6_STATE(ifp);
2198 	while ((o = dhcp6_findoption(d, l, D6_OPTION_IAPREFIX, &ol))) {
2199 		/* Set d and l first to ensure we find the next option. */
2200 		nd = o + ol;
2201 		l -= (size_t)(nd - d);
2202 		d = nd;
2203 		if (ol < sizeof(pdp)) {
2204 			errno = EINVAL;
2205 			logerrx("%s: IA Prefix option truncated", ifp->name);
2206 			continue;
2207 		}
2208 
2209 		memcpy(&pdp, o, sizeof(pdp));
2210 		pdp.pltime = ntohl(pdp.pltime);
2211 		pdp.vltime = ntohl(pdp.vltime);
2212 		/* RFC 3315 22.6 */
2213 		if (pdp.pltime > pdp.vltime) {
2214 			errno = EINVAL;
2215 			logerrx("%s: IA Prefix pltime %"PRIu32
2216 			    " > vltime %"PRIu32,
2217 			    ifp->name, pdp.pltime, pdp.vltime);
2218 			continue;
2219 		}
2220 
2221 		o += sizeof(pdp);
2222 		ol = (uint16_t)(ol - sizeof(pdp));
2223 
2224 		/* pdp.prefix is not aligned so copy it out. */
2225 		memcpy(&pdp_prefix, &pdp.prefix, sizeof(pdp_prefix));
2226 		TAILQ_FOREACH(a, &state->addrs, next) {
2227 			if (IN6_ARE_ADDR_EQUAL(&a->prefix, &pdp_prefix))
2228 				break;
2229 		}
2230 
2231 		if (a == NULL) {
2232 			a = ipv6_newaddr(ifp, &pdp_prefix, pdp.prefix_len,
2233 			    IPV6_AF_DELEGATEDPFX);
2234 			if (a == NULL)
2235 				break;
2236 			a->created = *acquired;
2237 			a->dadcallback = dhcp6_dadcallback;
2238 			a->ia_type = D6_OPTION_IA_PD;
2239 			memcpy(a->iaid, iaid, sizeof(a->iaid));
2240 			TAILQ_INSERT_TAIL(&state->addrs, a, next);
2241 		} else {
2242 			if (!(a->flags & IPV6_AF_DELEGATEDPFX))
2243 				a->flags |= IPV6_AF_NEW | IPV6_AF_DELEGATEDPFX;
2244 			a->flags &= ~(IPV6_AF_STALE |
2245 			              IPV6_AF_EXTENDED |
2246 			              IPV6_AF_REQUEST);
2247 			if (a->prefix_vltime != pdp.vltime)
2248 				a->flags |= IPV6_AF_NEW;
2249 		}
2250 
2251 		a->acquired = *acquired;
2252 		a->prefix_pltime = pdp.pltime;
2253 		a->prefix_vltime = pdp.vltime;
2254 
2255 		if (a->prefix_pltime && a->prefix_pltime < state->lowpl)
2256 			state->lowpl = a->prefix_pltime;
2257 		if (a->prefix_vltime && a->prefix_vltime > state->expire)
2258 			state->expire = a->prefix_vltime;
2259 		i++;
2260 
2261 		a->prefix_exclude_len = 0;
2262 		memset(&a->prefix_exclude, 0, sizeof(a->prefix_exclude));
2263 		o = dhcp6_findoption(o, ol, D6_OPTION_PD_EXCLUDE, &ol);
2264 		if (o == NULL)
2265 			continue;
2266 
2267 		/* RFC 6603 4.2 says option length MUST be between 2 and 17.
2268 		 * This allows 1 octet for prefix length and 16 for the
2269 		 * subnet ID. */
2270 		if (ol < 2 || ol > 17) {
2271 			logerrx("%s: invalid PD Exclude option", ifp->name);
2272 			continue;
2273 		}
2274 
2275 		/* RFC 6603 4.2 says prefix length MUST be between the
2276 		 * length of the IAPREFIX prefix length + 1 and 128. */
2277 		if (*o < a->prefix_len + 1 || *o > 128) {
2278 			logerrx("%s: invalid PD Exclude length", ifp->name);
2279 			continue;
2280 		}
2281 
2282 		ol--;
2283 		/* Check option length matches prefix length. */
2284 		if (((*o - a->prefix_len - 1) / NBBY) + 1 != ol) {
2285 			logerrx("%s: PD Exclude length mismatch", ifp->name);
2286 			continue;
2287 		}
2288 		a->prefix_exclude_len = *o++;
2289 
2290 		memcpy(&a->prefix_exclude, &a->prefix,
2291 		    sizeof(a->prefix_exclude));
2292 		nb = a->prefix_len % NBBY;
2293 		if (nb)
2294 			ol--;
2295 		pw = a->prefix_exclude.s6_addr +
2296 		    (a->prefix_exclude_len / NBBY) - 1;
2297 		while (ol-- > 0)
2298 			*pw-- = *o++;
2299 		if (nb)
2300 			*pw = (uint8_t)(*pw | (*o >> nb));
2301 	}
2302 	return i;
2303 }
2304 #endif
2305 
2306 static int
2307 dhcp6_findia(struct interface *ifp, struct dhcp6_message *m, size_t l,
2308     const char *sfrom, const struct timespec *acquired)
2309 {
2310 	struct dhcp6_state *state;
2311 	const struct if_options *ifo;
2312 	struct dhcp6_option o;
2313 	uint8_t *d, *p;
2314 	struct dhcp6_ia_na ia;
2315 	int i, e, error;
2316 	size_t j;
2317 	uint16_t nl;
2318 	uint8_t iaid[4];
2319 	char buf[sizeof(iaid) * 3];
2320 	struct ipv6_addr *ap;
2321 	struct if_ia *ifia;
2322 
2323 	if (l < sizeof(*m)) {
2324 		/* Should be impossible with guards at packet in
2325 		 * and reading leases */
2326 		errno = EINVAL;
2327 		return -1;
2328 	}
2329 
2330 	ifo = ifp->options;
2331 	i = e = 0;
2332 	state = D6_STATE(ifp);
2333 	TAILQ_FOREACH(ap, &state->addrs, next) {
2334 		if (!(ap->flags & IPV6_AF_DELEGATED))
2335 			ap->flags |= IPV6_AF_STALE;
2336 	}
2337 
2338 	d = (uint8_t *)m + sizeof(*m);
2339 	l -= sizeof(*m);
2340 	while (l > sizeof(o)) {
2341 		memcpy(&o, d, sizeof(o));
2342 		o.len = ntohs(o.len);
2343 		if (o.len > l || sizeof(o) + o.len > l) {
2344 			errno = EINVAL;
2345 			logerrx("%s: option overflow", ifp->name);
2346 			break;
2347 		}
2348 		p = d + sizeof(o);
2349 		d = p + o.len;
2350 		l -= sizeof(o) + o.len;
2351 
2352 		o.code = ntohs(o.code);
2353 		switch(o.code) {
2354 		case D6_OPTION_IA_TA:
2355 			nl = 4;
2356 			break;
2357 		case D6_OPTION_IA_NA:
2358 		case D6_OPTION_IA_PD:
2359 			nl = 12;
2360 			break;
2361 		default:
2362 			continue;
2363 		}
2364 		if (o.len < nl) {
2365 			errno = EINVAL;
2366 			logerrx("%s: IA option truncated", ifp->name);
2367 			continue;
2368 		}
2369 
2370 		memcpy(&ia, p, nl);
2371 		p += nl;
2372 		o.len = (uint16_t)(o.len - nl);
2373 
2374 		for (j = 0; j < ifo->ia_len; j++) {
2375 			ifia = &ifo->ia[j];
2376 			if (ifia->ia_type == o.code &&
2377 			    memcmp(ifia->iaid, ia.iaid, sizeof(ia.iaid)) == 0)
2378 				break;
2379 		}
2380 		if (j == ifo->ia_len &&
2381 		    !(ifo->ia_len == 0 && ifp->ctx->options & DHCPCD_DUMPLEASE))
2382 		{
2383 			logdebugx("%s: ignoring unrequested IAID %s",
2384 			    ifp->name,
2385 			    hwaddr_ntoa(ia.iaid, sizeof(ia.iaid),
2386 			    buf, sizeof(buf)));
2387 			continue;
2388 		}
2389 
2390 		if (o.code != D6_OPTION_IA_TA) {
2391 			ia.t1 = ntohl(ia.t1);
2392 			ia.t2 = ntohl(ia.t2);
2393 			/* RFC 3315 22.4 */
2394 			if (ia.t2 > 0 && ia.t1 > ia.t2) {
2395 				logwarnx("%s: IAID %s T1(%d) > T2(%d) from %s",
2396 				    ifp->name,
2397 				    hwaddr_ntoa(iaid, sizeof(iaid), buf,
2398 				                sizeof(buf)),
2399 				    ia.t1, ia.t2, sfrom);
2400 				continue;
2401 			}
2402 		} else
2403 			ia.t1 = ia.t2 = 0; /* appease gcc */
2404 		if ((error = dhcp6_checkstatusok(ifp, NULL, p, o.len)) != 0) {
2405 			if (error == D6_STATUS_NOBINDING)
2406 				state->has_no_binding = true;
2407 			e = 1;
2408 			continue;
2409 		}
2410 		if (o.code == D6_OPTION_IA_PD) {
2411 #ifndef SMALL
2412 			if (dhcp6_findpd(ifp, ia.iaid, p, o.len,
2413 					 acquired) == 0)
2414 			{
2415 				logwarnx("%s: %s: DHCPv6 REPLY missing Prefix",
2416 				    ifp->name, sfrom);
2417 				continue;
2418 			}
2419 #endif
2420 		} else {
2421 			if (dhcp6_findna(ifp, o.code, ia.iaid, p, o.len,
2422 					 acquired) == 0)
2423 			{
2424 				logwarnx("%s: %s: DHCPv6 REPLY missing "
2425 				    "IA Address",
2426 				    ifp->name, sfrom);
2427 				continue;
2428 			}
2429 		}
2430 		if (o.code != D6_OPTION_IA_TA) {
2431 			if (ia.t1 != 0 &&
2432 			    (ia.t1 < state->renew || state->renew == 0))
2433 				state->renew = ia.t1;
2434 			if (ia.t2 != 0 &&
2435 			    (ia.t2 < state->rebind || state->rebind == 0))
2436 				state->rebind = ia.t2;
2437 		}
2438 		i++;
2439 	}
2440 
2441 	if (i == 0 && e)
2442 		return -1;
2443 	return i;
2444 }
2445 
2446 #ifndef SMALL
2447 static void
2448 dhcp6_deprecatedele(struct ipv6_addr *ia)
2449 {
2450 	struct ipv6_addr *da, *dan, *dda;
2451 	struct timespec now;
2452 	struct dhcp6_state *state;
2453 
2454 	timespecclear(&now);
2455 	TAILQ_FOREACH_SAFE(da, &ia->pd_pfxs, pd_next, dan) {
2456 		if (ia->prefix_vltime == 0) {
2457 			if (da->prefix_vltime != 0)
2458 				da->prefix_vltime = 0;
2459 			else
2460 				continue;
2461 		} else if (da->prefix_pltime != 0)
2462 			da->prefix_pltime = 0;
2463 		else
2464 			continue;
2465 
2466 		if (ipv6_doaddr(da, &now) != -1)
2467 			continue;
2468 
2469 		/* Delegation deleted, forget it. */
2470 		TAILQ_REMOVE(&ia->pd_pfxs, da, pd_next);
2471 
2472 		/* Delete it from the interface. */
2473 		state = D6_STATE(da->iface);
2474 		TAILQ_FOREACH(dda, &state->addrs, next) {
2475 			if (IN6_ARE_ADDR_EQUAL(&dda->addr, &da->addr))
2476 				break;
2477 		}
2478 		if (dda != NULL) {
2479 			TAILQ_REMOVE(&state->addrs, dda, next);
2480 			ipv6_freeaddr(dda);
2481 		}
2482 	}
2483 }
2484 #endif
2485 
2486 static void
2487 dhcp6_deprecateaddrs(struct ipv6_addrhead *addrs)
2488 {
2489 	struct ipv6_addr *ia, *ian;
2490 
2491 	TAILQ_FOREACH_SAFE(ia, addrs, next, ian) {
2492 		if (ia->flags & IPV6_AF_EXTENDED)
2493 			;
2494 		else if (ia->flags & IPV6_AF_STALE) {
2495 			if (ia->prefix_vltime != 0)
2496 				logdebugx("%s: %s: became stale",
2497 				    ia->iface->name, ia->saddr);
2498 			/* Technically this violates RFC 8415 18.2.10.1,
2499 			 * but we need a mechanism to tell the kernel to
2500 			 * try and prefer other addresses. */
2501 			ia->prefix_pltime = 0;
2502 		} else if (ia->prefix_vltime == 0)
2503 			loginfox("%s: %s: no valid lifetime",
2504 			    ia->iface->name, ia->saddr);
2505 		else
2506 			continue;
2507 
2508 #ifndef SMALL
2509 		/* If we delegated from this prefix, deprecate or remove
2510 		 * the delegations. */
2511 		if (ia->flags & IPV6_AF_DELEGATEDPFX)
2512 			dhcp6_deprecatedele(ia);
2513 #endif
2514 
2515 		if (ia->flags & IPV6_AF_REQUEST) {
2516 			ia->prefix_vltime = ia->prefix_pltime = 0;
2517 			eloop_q_timeout_delete(ia->iface->ctx->eloop,
2518 			    ELOOP_QUEUE_ALL, NULL, ia);
2519 			continue;
2520 		}
2521 		TAILQ_REMOVE(addrs, ia, next);
2522 		if (ia->flags & IPV6_AF_EXTENDED)
2523 			ipv6_deleteaddr(ia);
2524 		ipv6_freeaddr(ia);
2525 	}
2526 }
2527 
2528 static int
2529 dhcp6_validatelease(struct interface *ifp,
2530     struct dhcp6_message *m, size_t len,
2531     const char *sfrom, const struct timespec *acquired)
2532 {
2533 	struct dhcp6_state *state;
2534 	int nia, ok_errno;
2535 	struct timespec aq;
2536 
2537 	if (len <= sizeof(*m)) {
2538 		logerrx("%s: DHCPv6 lease truncated", ifp->name);
2539 		return -1;
2540 	}
2541 
2542 	state = D6_STATE(ifp);
2543 	errno = 0;
2544 	if (dhcp6_checkstatusok(ifp, m, NULL, len) != 0)
2545 		return -1;
2546 	ok_errno = errno;
2547 
2548 	state->renew = state->rebind = state->expire = 0;
2549 	state->lowpl = ND6_INFINITE_LIFETIME;
2550 	if (!acquired) {
2551 		clock_gettime(CLOCK_MONOTONIC, &aq);
2552 		acquired = &aq;
2553 	}
2554 	state->has_no_binding = false;
2555 	nia = dhcp6_findia(ifp, m, len, sfrom, acquired);
2556 	if (nia == 0) {
2557 		if (state->state != DH6S_CONFIRM && ok_errno != 0) {
2558 			logerrx("%s: no useable IA found in lease", ifp->name);
2559 			return -1;
2560 		}
2561 
2562 		/* We are confirming and have an OK,
2563 		 * so look for ia's in our old lease.
2564 		 * IA's must have existed here otherwise we would
2565 		 * have rejected it earlier. */
2566 		assert(state->new != NULL && state->new_len != 0);
2567 		state->has_no_binding = false;
2568 		nia = dhcp6_findia(ifp, state->new, state->new_len,
2569 		    sfrom, acquired);
2570 	}
2571 	return nia;
2572 }
2573 
2574 static ssize_t
2575 dhcp6_readlease(struct interface *ifp, int validate)
2576 {
2577 	union {
2578 		struct dhcp6_message dhcp6;
2579 		uint8_t buf[UDPLEN_MAX];
2580 	} buf;
2581 	struct dhcp6_state *state;
2582 	ssize_t bytes;
2583 	int fd;
2584 	time_t mtime, now;
2585 #ifdef AUTH
2586 	uint8_t *o;
2587 	uint16_t ol;
2588 #endif
2589 
2590 	state = D6_STATE(ifp);
2591 	if (state->leasefile[0] == '\0') {
2592 		logdebugx("reading standard input");
2593 		bytes = read(fileno(stdin), buf.buf, sizeof(buf.buf));
2594 	} else {
2595 		logdebugx("%s: reading lease: %s",
2596 		    ifp->name, state->leasefile);
2597 		bytes = dhcp_readfile(ifp->ctx, state->leasefile,
2598 		    buf.buf, sizeof(buf.buf));
2599 	}
2600 	if (bytes == -1)
2601 		goto ex;
2602 
2603 	if (ifp->ctx->options & DHCPCD_DUMPLEASE || state->leasefile[0] == '\0')
2604 		goto out;
2605 
2606 	if (bytes == 0)
2607 		goto ex;
2608 
2609 	/* If not validating IA's and if they have expired,
2610 	 * skip to the auth check. */
2611 	if (!validate)
2612 		goto auth;
2613 
2614 	if (dhcp_filemtime(ifp->ctx, state->leasefile, &mtime) == -1)
2615 		goto ex;
2616 	clock_gettime(CLOCK_MONOTONIC, &state->acquired);
2617 	if ((now = time(NULL)) == -1)
2618 		goto ex;
2619 	state->acquired.tv_sec -= now - mtime;
2620 
2621 	/* Check to see if the lease is still valid */
2622 	fd = dhcp6_validatelease(ifp, &buf.dhcp6, (size_t)bytes, NULL,
2623 	    &state->acquired);
2624 	if (fd == -1)
2625 		goto ex;
2626 
2627 	if (state->expire != ND6_INFINITE_LIFETIME &&
2628 	    (time_t)state->expire < now - mtime &&
2629 	    !(ifp->options->options & DHCPCD_LASTLEASE_EXTEND))
2630 	{
2631 		logdebugx("%s: discarding expired lease", ifp->name);
2632 		bytes = 0;
2633 		goto ex;
2634 	}
2635 
2636 auth:
2637 #ifdef AUTH
2638 	/* Authenticate the message */
2639 	o = dhcp6_findmoption(&buf.dhcp6, (size_t)bytes, D6_OPTION_AUTH, &ol);
2640 	if (o) {
2641 		if (dhcp_auth_validate(&state->auth, &ifp->options->auth,
2642 		    buf.buf, (size_t)bytes, 6, buf.dhcp6.type, o, ol) == NULL)
2643 		{
2644 			logerr("%s: authentication failed", ifp->name);
2645 			bytes = 0;
2646 			goto ex;
2647 		}
2648 		if (state->auth.token)
2649 			logdebugx("%s: validated using 0x%08" PRIu32,
2650 			    ifp->name, state->auth.token->secretid);
2651 		else
2652 			loginfox("%s: accepted reconfigure key", ifp->name);
2653 	} else if ((ifp->options->auth.options & DHCPCD_AUTH_SENDREQUIRE) ==
2654 	    DHCPCD_AUTH_SENDREQUIRE)
2655 	{
2656 		logerrx("%s: authentication now required", ifp->name);
2657 		goto ex;
2658 	}
2659 #endif
2660 
2661 out:
2662 	free(state->new);
2663 	state->new = malloc((size_t)bytes);
2664 	if (state->new == NULL) {
2665 		logerr(__func__);
2666 		goto ex;
2667 	}
2668 
2669 	memcpy(state->new, buf.buf, (size_t)bytes);
2670 	state->new_len = (size_t)bytes;
2671 	return bytes;
2672 
2673 ex:
2674 	dhcp6_freedrop_addrs(ifp, 0, NULL);
2675 	dhcp_unlink(ifp->ctx, state->leasefile);
2676 	free(state->new);
2677 	state->new = NULL;
2678 	state->new_len = 0;
2679 	dhcp6_addrequestedaddrs(ifp);
2680 	return bytes == 0 ? 0 : -1;
2681 }
2682 
2683 static void
2684 dhcp6_startinit(struct interface *ifp)
2685 {
2686 	struct dhcp6_state *state;
2687 	ssize_t r;
2688 	uint8_t has_ta, has_non_ta;
2689 	size_t i;
2690 
2691 	state = D6_STATE(ifp);
2692 	state->state = DH6S_INIT;
2693 	state->expire = ND6_INFINITE_LIFETIME;
2694 	state->lowpl = ND6_INFINITE_LIFETIME;
2695 
2696 	dhcp6_addrequestedaddrs(ifp);
2697 	has_ta = has_non_ta = 0;
2698 	for (i = 0; i < ifp->options->ia_len; i++) {
2699 		switch (ifp->options->ia[i].ia_type) {
2700 		case D6_OPTION_IA_TA:
2701 			has_ta = 1;
2702 			break;
2703 		default:
2704 			has_non_ta = 1;
2705 		}
2706 	}
2707 
2708 	if (!(ifp->ctx->options & DHCPCD_TEST) &&
2709 	    !(has_ta && !has_non_ta) &&
2710 	    ifp->options->reboot != 0)
2711 	{
2712 		r = dhcp6_readlease(ifp, 1);
2713 		if (r == -1) {
2714 			if (errno != ENOENT && errno != ESRCH)
2715 				logerr("%s: %s", __func__, state->leasefile);
2716 		} else if (r != 0 &&
2717 		    !(ifp->options->options & DHCPCD_ANONYMOUS))
2718 		{
2719 			/* RFC 3633 section 12.1 */
2720 #ifndef SMALL
2721 			if (dhcp6_hasprefixdelegation(ifp))
2722 				dhcp6_startrebind(ifp);
2723 			else
2724 #endif
2725 				dhcp6_startconfirm(ifp);
2726 			return;
2727 		}
2728 	}
2729 	dhcp6_startdiscoinform(ifp);
2730 }
2731 
2732 #ifndef SMALL
2733 static struct ipv6_addr *
2734 dhcp6_ifdelegateaddr(struct interface *ifp, struct ipv6_addr *prefix,
2735     const struct if_sla *sla, struct if_ia *if_ia)
2736 {
2737 	struct dhcp6_state *state;
2738 	struct in6_addr addr, daddr;
2739 	struct ipv6_addr *ia;
2740 	int pfxlen, dadcounter;
2741 	uint64_t vl;
2742 
2743 	/* RFC6603 Section 4.2 */
2744 	if (strcmp(ifp->name, prefix->iface->name) == 0) {
2745 		if (prefix->prefix_exclude_len == 0) {
2746 			/* Don't spam the log automatically */
2747 			if (sla != NULL)
2748 				logwarnx("%s: DHCPv6 server does not support "
2749 				    "OPTION_PD_EXCLUDE",
2750 				    ifp->name);
2751 			return NULL;
2752 		}
2753 		pfxlen = prefix->prefix_exclude_len;
2754 		memcpy(&addr, &prefix->prefix_exclude, sizeof(addr));
2755 	} else if ((pfxlen = dhcp6_delegateaddr(&addr, ifp, prefix,
2756 	    sla, if_ia)) == -1)
2757 		return NULL;
2758 
2759 	if (sla != NULL && fls64(sla->suffix) > 128 - pfxlen) {
2760 		logerrx("%s: suffix %" PRIu64 " + prefix_len %d > 128",
2761 		    ifp->name, sla->suffix, pfxlen);
2762 		return NULL;
2763 	}
2764 
2765 	/* Add our suffix */
2766 	if (sla != NULL && sla->suffix != 0) {
2767 		daddr = addr;
2768 		vl = be64dec(addr.s6_addr + 8);
2769 		vl |= sla->suffix;
2770 		be64enc(daddr.s6_addr + 8, vl);
2771 	} else {
2772 		dadcounter = ipv6_makeaddr(&daddr, ifp, &addr, pfxlen, 0);
2773 		if (dadcounter == -1) {
2774 			logerrx("%s: error adding slaac to prefix_len %d",
2775 			    ifp->name, pfxlen);
2776 			return NULL;
2777 		}
2778 	}
2779 
2780 	/* Find an existing address */
2781 	state = D6_STATE(ifp);
2782 	TAILQ_FOREACH(ia, &state->addrs, next) {
2783 		if (IN6_ARE_ADDR_EQUAL(&ia->addr, &daddr))
2784 			break;
2785 	}
2786 	if (ia == NULL) {
2787 		ia = ipv6_newaddr(ifp, &daddr, (uint8_t)pfxlen, IPV6_AF_ONLINK);
2788 		if (ia == NULL)
2789 			return NULL;
2790 		ia->dadcallback = dhcp6_dadcallback;
2791 		memcpy(&ia->iaid, &prefix->iaid, sizeof(ia->iaid));
2792 		ia->created = prefix->acquired;
2793 
2794 		TAILQ_INSERT_TAIL(&state->addrs, ia, next);
2795 		TAILQ_INSERT_TAIL(&prefix->pd_pfxs, ia, pd_next);
2796 	}
2797 	ia->delegating_prefix = prefix;
2798 	ia->prefix = addr;
2799 	ia->prefix_len = (uint8_t)pfxlen;
2800 	ia->acquired = prefix->acquired;
2801 	ia->prefix_pltime = prefix->prefix_pltime;
2802 	ia->prefix_vltime = prefix->prefix_vltime;
2803 
2804 	/* If the prefix length hasn't changed,
2805 	 * don't install a reject route. */
2806 	if (prefix->prefix_len == pfxlen)
2807 		prefix->flags |= IPV6_AF_NOREJECT;
2808 	else
2809 		prefix->flags &= ~IPV6_AF_NOREJECT;
2810 
2811 	return ia;
2812 }
2813 #endif
2814 
2815 static void
2816 dhcp6_script_try_run(struct interface *ifp, int delegated)
2817 {
2818 	struct dhcp6_state *state;
2819 	struct ipv6_addr *ap;
2820 	int completed;
2821 
2822 	state = D6_STATE(ifp);
2823 	completed = 1;
2824 	/* If all addresses have completed DAD run the script */
2825 	TAILQ_FOREACH(ap, &state->addrs, next) {
2826 		if (!(ap->flags & IPV6_AF_ADDED))
2827 			continue;
2828 		if (ap->flags & IPV6_AF_ONLINK) {
2829 			if (!(ap->flags & IPV6_AF_DADCOMPLETED) &&
2830 			    ipv6_iffindaddr(ap->iface, &ap->addr,
2831 			                    IN6_IFF_TENTATIVE))
2832 				ap->flags |= IPV6_AF_DADCOMPLETED;
2833 			if ((ap->flags & IPV6_AF_DADCOMPLETED) == 0
2834 #ifndef SMALL
2835 			    && ((delegated && ap->delegating_prefix) ||
2836 			    (!delegated && !ap->delegating_prefix))
2837 #endif
2838 			    )
2839 			{
2840 				completed = 0;
2841 				break;
2842 			}
2843 		}
2844 	}
2845 	if (completed) {
2846 		script_runreason(ifp, delegated ? "DELEGATED6" : state->reason);
2847 		if (!delegated)
2848 			dhcpcd_daemonise(ifp->ctx);
2849 	} else
2850 		logdebugx("%s: waiting for DHCPv6 DAD to complete", ifp->name);
2851 }
2852 
2853 #ifdef SMALL
2854 size_t
2855 dhcp6_find_delegates(__unused struct interface *ifp)
2856 {
2857 
2858 	return 0;
2859 }
2860 #else
2861 static void
2862 dhcp6_delegate_prefix(struct interface *ifp)
2863 {
2864 	struct if_options *ifo;
2865 	struct dhcp6_state *state;
2866 	struct ipv6_addr *ap;
2867 	size_t i, j, k;
2868 	struct if_ia *ia;
2869 	struct if_sla *sla;
2870 	struct interface *ifd;
2871 	bool carrier_warned;
2872 
2873 	ifo = ifp->options;
2874 	state = D6_STATE(ifp);
2875 
2876 	/* Clear the logged flag. */
2877 	TAILQ_FOREACH(ap, &state->addrs, next) {
2878 		ap->flags &= ~IPV6_AF_DELEGATEDLOG;
2879 	}
2880 
2881 	TAILQ_FOREACH(ifd, ifp->ctx->ifaces, next) {
2882 		if (!ifd->active)
2883 			continue;
2884 		if (!(ifd->options->options & DHCPCD_CONFIGURE))
2885 			continue;
2886 		k = 0;
2887 		carrier_warned = false;
2888 		TAILQ_FOREACH(ap, &state->addrs, next) {
2889 			if (!(ap->flags & IPV6_AF_DELEGATEDPFX))
2890 				continue;
2891 			if (!(ap->flags & IPV6_AF_DELEGATEDLOG)) {
2892 				int loglevel;
2893 
2894 				if (ap->flags & IPV6_AF_NEW)
2895 					loglevel = LOG_INFO;
2896 				else
2897 					loglevel = LOG_DEBUG;
2898 				/* We only want to log this the once as we loop
2899 				 * through many interfaces first. */
2900 				ap->flags |= IPV6_AF_DELEGATEDLOG;
2901 				logmessage(loglevel, "%s: delegated prefix %s",
2902 				    ifp->name, ap->saddr);
2903 				ap->flags &= ~IPV6_AF_NEW;
2904 			}
2905 			for (i = 0; i < ifo->ia_len; i++) {
2906 				ia = &ifo->ia[i];
2907 				if (ia->ia_type != D6_OPTION_IA_PD)
2908 					continue;
2909 				if (memcmp(ia->iaid, ap->iaid,
2910 				    sizeof(ia->iaid)))
2911 					continue;
2912 				if (ia->sla_len == 0) {
2913 					/* no SLA configured, so lets
2914 					 * automate it */
2915 					if (!if_is_link_up(ifd)) {
2916 						logdebugx(
2917 						    "%s: has no carrier, cannot"
2918 						    " delegate addresses",
2919 						    ifd->name);
2920 						carrier_warned = true;
2921 						break;
2922 					}
2923 					if (dhcp6_ifdelegateaddr(ifd, ap,
2924 					    NULL, ia))
2925 						k++;
2926 				}
2927 				for (j = 0; j < ia->sla_len; j++) {
2928 					sla = &ia->sla[j];
2929 					if (strcmp(ifd->name, sla->ifname))
2930 						continue;
2931 					if (!if_is_link_up(ifd)) {
2932 						logdebugx(
2933 						    "%s: has no carrier, cannot"
2934 						    " delegate addresses",
2935 						    ifd->name);
2936 						carrier_warned = true;
2937 						break;
2938 					}
2939 					if (dhcp6_ifdelegateaddr(ifd, ap,
2940 					    sla, ia))
2941 						k++;
2942 				}
2943 				if (carrier_warned)
2944 					break;
2945 			}
2946 			if (carrier_warned)
2947 				break;
2948 		}
2949 		if (k && !carrier_warned) {
2950 			struct dhcp6_state *s = D6_STATE(ifd);
2951 
2952 			ipv6_addaddrs(&s->addrs);
2953 			dhcp6_script_try_run(ifd, 1);
2954 		}
2955 	}
2956 
2957 	/* Now all addresses have been added, rebuild the routing table. */
2958 	rt_build(ifp->ctx, AF_INET6);
2959 }
2960 
2961 static void
2962 dhcp6_find_delegates1(void *arg)
2963 {
2964 
2965 	dhcp6_find_delegates(arg);
2966 }
2967 
2968 size_t
2969 dhcp6_find_delegates(struct interface *ifp)
2970 {
2971 	struct if_options *ifo;
2972 	struct dhcp6_state *state;
2973 	struct ipv6_addr *ap;
2974 	size_t i, j, k;
2975 	struct if_ia *ia;
2976 	struct if_sla *sla;
2977 	struct interface *ifd;
2978 
2979 	if (ifp->options != NULL &&
2980 	    !(ifp->options->options & DHCPCD_CONFIGURE))
2981 		return 0;
2982 
2983 	k = 0;
2984 	TAILQ_FOREACH(ifd, ifp->ctx->ifaces, next) {
2985 		ifo = ifd->options;
2986 		state = D6_STATE(ifd);
2987 		if (state == NULL || state->state != DH6S_BOUND)
2988 			continue;
2989 		TAILQ_FOREACH(ap, &state->addrs, next) {
2990 			if (!(ap->flags & IPV6_AF_DELEGATEDPFX))
2991 				continue;
2992 			for (i = 0; i < ifo->ia_len; i++) {
2993 				ia = &ifo->ia[i];
2994 				if (ia->ia_type != D6_OPTION_IA_PD)
2995 					continue;
2996 				if (memcmp(ia->iaid, ap->iaid,
2997 				    sizeof(ia->iaid)))
2998 					continue;
2999 				for (j = 0; j < ia->sla_len; j++) {
3000 					sla = &ia->sla[j];
3001 					if (strcmp(ifp->name, sla->ifname))
3002 						continue;
3003 					if (ipv6_linklocal(ifp) == NULL) {
3004 						logdebugx(
3005 						    "%s: delaying adding"
3006 						    " delegated addresses for"
3007 						    " LL address",
3008 						    ifp->name);
3009 						ipv6_addlinklocalcallback(ifp,
3010 						    dhcp6_find_delegates1, ifp);
3011 						return 1;
3012 					}
3013 					if (dhcp6_ifdelegateaddr(ifp, ap,
3014 					    sla, ia))
3015 					    k++;
3016 				}
3017 			}
3018 		}
3019 	}
3020 
3021 	if (k) {
3022 		loginfox("%s: adding delegated prefixes", ifp->name);
3023 		state = D6_STATE(ifp);
3024 		state->state = DH6S_DELEGATED;
3025 		ipv6_addaddrs(&state->addrs);
3026 		rt_build(ifp->ctx, AF_INET6);
3027 		dhcp6_script_try_run(ifp, 1);
3028 	}
3029 	return k;
3030 }
3031 #endif
3032 
3033 static void
3034 dhcp6_bind(struct interface *ifp, const char *op, const char *sfrom)
3035 {
3036 	struct dhcp6_state *state = D6_STATE(ifp);
3037 	bool timedout = (op == NULL), has_new = false, confirmed;
3038 	struct ipv6_addr *ia;
3039 	int loglevel;
3040 	struct timespec now;
3041 
3042 	TAILQ_FOREACH(ia, &state->addrs, next) {
3043 		if (ia->flags & IPV6_AF_NEW) {
3044 			has_new = true;
3045 			break;
3046 		}
3047 	}
3048 	loglevel = has_new || state->state != DH6S_RENEW ? LOG_INFO : LOG_DEBUG;
3049 	if (!timedout) {
3050 		logmessage(loglevel, "%s: %s received from %s",
3051 		    ifp->name, op, sfrom);
3052 #ifndef SMALL
3053 		/* If we delegated from an unconfirmed lease we MUST drop
3054 		 * them now. Hopefully we have new delegations. */
3055 		if (state->reason != NULL &&
3056 		    strcmp(state->reason, "TIMEOUT6") == 0)
3057 			dhcp6_delete_delegates(ifp);
3058 #endif
3059 		state->reason = NULL;
3060 	} else
3061 		state->reason = "TIMEOUT6";
3062 
3063 	eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp);
3064 	clock_gettime(CLOCK_MONOTONIC, &now);
3065 
3066 	switch(state->state) {
3067 	case DH6S_INFORM:
3068 	{
3069 		struct dhcp6_option *o;
3070 		uint16_t ol;
3071 
3072 		if (state->reason == NULL)
3073 			state->reason = "INFORM6";
3074 		o = dhcp6_findmoption(state->new, state->new_len,
3075 		                      D6_OPTION_INFO_REFRESH_TIME, &ol);
3076 		if (o == NULL || ol != sizeof(uint32_t))
3077 			state->renew = IRT_DEFAULT;
3078 		else {
3079 			memcpy(&state->renew, o, ol);
3080 			state->renew = ntohl(state->renew);
3081 			if (state->renew < IRT_MINIMUM)
3082 				state->renew = IRT_MINIMUM;
3083 		}
3084 		state->rebind = 0;
3085 		state->expire = ND6_INFINITE_LIFETIME;
3086 		state->lowpl = ND6_INFINITE_LIFETIME;
3087 	}
3088 		break;
3089 
3090 	case DH6S_REQUEST:
3091 		if (state->reason == NULL)
3092 			state->reason = "BOUND6";
3093 		/* FALLTHROUGH */
3094 	case DH6S_RENEW:
3095 		if (state->reason == NULL)
3096 			state->reason = "RENEW6";
3097 		/* FALLTHROUGH */
3098 	case DH6S_REBIND:
3099 		if (state->reason == NULL)
3100 			state->reason = "REBIND6";
3101 		/* FALLTHROUGH */
3102 	case DH6S_CONFIRM:
3103 		if (state->reason == NULL)
3104 			state->reason = "REBOOT6";
3105 		if (state->renew != 0) {
3106 			bool all_expired = true;
3107 
3108 			TAILQ_FOREACH(ia, &state->addrs, next) {
3109 				if (ia->flags & IPV6_AF_STALE)
3110 					continue;
3111 				if (!(state->renew == ND6_INFINITE_LIFETIME
3112 				    && ia->prefix_vltime == ND6_INFINITE_LIFETIME)
3113 				    && ia->prefix_vltime != 0
3114 				    && ia->prefix_vltime <= state->renew)
3115 					logwarnx(
3116 					    "%s: %s will expire before renewal",
3117 					    ifp->name, ia->saddr);
3118 				else
3119 					all_expired = false;
3120 			}
3121 			if (all_expired) {
3122 				/* All address's vltime happens at or before
3123 				 * the configured T1 in the IA.
3124 				 * This is a badly configured server and we
3125 				 * have to use our own notion of what
3126 				 * T1 and T2 should be as a result.
3127 				 *
3128 				 * Doing this violates RFC 3315 22.4:
3129 				 * In a message sent by a server to a client,
3130 				 * the client MUST use the values in the T1
3131 				 * and T2 fields for the T1 and T2 parameters,
3132 				 * unless those values in those fields are 0.
3133 				 */
3134 				logwarnx("%s: ignoring T1 %"PRIu32
3135 				    " due to address expiry",
3136 				    ifp->name, state->renew);
3137 				state->renew = state->rebind = 0;
3138 			}
3139 		}
3140 		if (state->renew == 0 && state->lowpl != ND6_INFINITE_LIFETIME)
3141 			state->renew = (uint32_t)(state->lowpl * 0.5);
3142 		if (state->rebind == 0 && state->lowpl != ND6_INFINITE_LIFETIME)
3143 			state->rebind = (uint32_t)(state->lowpl * 0.8);
3144 		break;
3145 	default:
3146 		state->reason = "UNKNOWN6";
3147 		break;
3148 	}
3149 
3150 	if (state->state != DH6S_CONFIRM && !timedout) {
3151 		state->acquired = now;
3152 		free(state->old);
3153 		state->old = state->new;
3154 		state->old_len = state->new_len;
3155 		state->new = state->recv;
3156 		state->new_len = state->recv_len;
3157 		state->recv = NULL;
3158 		state->recv_len = 0;
3159 		confirmed = false;
3160 	} else {
3161 		/* Reduce timers based on when we got the lease. */
3162 		uint32_t elapsed;
3163 
3164 		elapsed = (uint32_t)eloop_timespec_diff(&now,
3165 		    &state->acquired, NULL);
3166 		if (state->renew && state->renew != ND6_INFINITE_LIFETIME) {
3167 			if (state->renew > elapsed)
3168 				state->renew -= elapsed;
3169 			else
3170 				state->renew = 0;
3171 		}
3172 		if (state->rebind && state->rebind != ND6_INFINITE_LIFETIME) {
3173 			if (state->rebind > elapsed)
3174 				state->rebind -= elapsed;
3175 			else
3176 				state->rebind = 0;
3177 		}
3178 		if (state->expire && state->expire != ND6_INFINITE_LIFETIME) {
3179 			if (state->expire > elapsed)
3180 				state->expire -= elapsed;
3181 			else
3182 				state->expire = 0;
3183 		}
3184 		confirmed = true;
3185 	}
3186 
3187 	if (ifp->ctx->options & DHCPCD_TEST)
3188 		script_runreason(ifp, "TEST");
3189 	else {
3190 		if (state->state == DH6S_INFORM)
3191 			state->state = DH6S_INFORMED;
3192 		else
3193 			state->state = DH6S_BOUND;
3194 		state->failed = false;
3195 
3196 		if (state->renew && state->renew != ND6_INFINITE_LIFETIME)
3197 			eloop_timeout_add_sec(ifp->ctx->eloop,
3198 			    state->renew,
3199 			    state->state == DH6S_INFORMED ?
3200 			    dhcp6_startinform : dhcp6_startrenew, ifp);
3201 		if (state->rebind && state->rebind != ND6_INFINITE_LIFETIME)
3202 			eloop_timeout_add_sec(ifp->ctx->eloop,
3203 			    state->rebind, dhcp6_startrebind, ifp);
3204 		if (state->expire != ND6_INFINITE_LIFETIME)
3205 			eloop_timeout_add_sec(ifp->ctx->eloop,
3206 			    state->expire, dhcp6_startexpire, ifp);
3207 
3208 		if (ifp->options->options & DHCPCD_CONFIGURE) {
3209 			ipv6_addaddrs(&state->addrs);
3210 			if (!timedout)
3211 				dhcp6_deprecateaddrs(&state->addrs);
3212 		}
3213 
3214 		if (state->state == DH6S_INFORMED)
3215 			logmessage(loglevel, "%s: refresh in %"PRIu32" seconds",
3216 			    ifp->name, state->renew);
3217 		else if (state->renew == ND6_INFINITE_LIFETIME)
3218 			logmessage(loglevel, "%s: leased for infinity",
3219 			    ifp->name);
3220 		else if (state->renew || state->rebind)
3221 			logmessage(loglevel, "%s: renew in %"PRIu32", "
3222 			    "rebind in %"PRIu32", "
3223 			    "expire in %"PRIu32" seconds",
3224 			    ifp->name,
3225 			    state->renew, state->rebind, state->expire);
3226 		else if (state->expire == 0)
3227 			logmessage(loglevel, "%s: will expire", ifp->name);
3228 		else
3229 			logmessage(loglevel, "%s: expire in %"PRIu32" seconds",
3230 			    ifp->name, state->expire);
3231 		rt_build(ifp->ctx, AF_INET6);
3232 		if (!confirmed && !timedout) {
3233 			logdebugx("%s: writing lease: %s",
3234 			    ifp->name, state->leasefile);
3235 			if (dhcp_writefile(ifp->ctx, state->leasefile, 0640,
3236 			    state->new, state->new_len) == -1)
3237 				logerr("dhcp_writefile: %s",state->leasefile);
3238 		}
3239 #ifndef SMALL
3240 		dhcp6_delegate_prefix(ifp);
3241 #endif
3242 		dhcp6_script_try_run(ifp, 0);
3243 	}
3244 
3245 	if (ifp->ctx->options & DHCPCD_TEST ||
3246 	    (ifp->options->options & DHCPCD_INFORM &&
3247 	    !(ifp->ctx->options & DHCPCD_MASTER)))
3248 	{
3249 		eloop_exit(ifp->ctx->eloop, EXIT_SUCCESS);
3250 	}
3251 }
3252 
3253 static void
3254 dhcp6_recvif(struct interface *ifp, const char *sfrom,
3255     struct dhcp6_message *r, size_t len)
3256 {
3257 	struct dhcpcd_ctx *ctx;
3258 	size_t i;
3259 	const char *op;
3260 	struct dhcp6_state *state;
3261 	uint8_t *o;
3262 	uint16_t ol;
3263 	const struct dhcp_opt *opt;
3264 	const struct if_options *ifo;
3265 	bool valid_op;
3266 #ifdef AUTH
3267 	uint8_t *auth;
3268 	uint16_t auth_len;
3269 #endif
3270 
3271 	ctx = ifp->ctx;
3272 	state = D6_STATE(ifp);
3273 	if (state == NULL || state->send == NULL) {
3274 		logdebugx("%s: DHCPv6 reply received but not running",
3275 		    ifp->name);
3276 		return;
3277 	}
3278 
3279 	/* We're already bound and this message is for another machine */
3280 	/* XXX DELEGATED? */
3281 	if (r->type != DHCP6_RECONFIGURE &&
3282 	    (state->state == DH6S_BOUND || state->state == DH6S_INFORMED))
3283 	{
3284 		logdebugx("%s: DHCPv6 reply received but already bound",
3285 		    ifp->name);
3286 		return;
3287 	}
3288 
3289 	if (dhcp6_findmoption(r, len, D6_OPTION_SERVERID, NULL) == NULL) {
3290 		logdebugx("%s: no DHCPv6 server ID from %s", ifp->name, sfrom);
3291 		return;
3292 	}
3293 
3294 	ifo = ifp->options;
3295 	for (i = 0, opt = ctx->dhcp6_opts;
3296 	    i < ctx->dhcp6_opts_len;
3297 	    i++, opt++)
3298 	{
3299 		if (has_option_mask(ifo->requiremask6, opt->option) &&
3300 		    !dhcp6_findmoption(r, len, (uint16_t)opt->option, NULL))
3301 		{
3302 			logwarnx("%s: reject DHCPv6 (no option %s) from %s",
3303 			    ifp->name, opt->var, sfrom);
3304 			return;
3305 		}
3306 		if (has_option_mask(ifo->rejectmask6, opt->option) &&
3307 		    dhcp6_findmoption(r, len, (uint16_t)opt->option, NULL))
3308 		{
3309 			logwarnx("%s: reject DHCPv6 (option %s) from %s",
3310 			    ifp->name, opt->var, sfrom);
3311 			return;
3312 		}
3313 	}
3314 
3315 #ifdef AUTH
3316 	/* Authenticate the message */
3317 	auth = dhcp6_findmoption(r, len, D6_OPTION_AUTH, &auth_len);
3318 	if (auth != NULL) {
3319 		if (dhcp_auth_validate(&state->auth, &ifo->auth,
3320 		    (uint8_t *)r, len, 6, r->type, auth, auth_len) == NULL)
3321 		{
3322 			logerr("%s: authentication failed from %s",
3323 			    ifp->name, sfrom);
3324 			return;
3325 		}
3326 		if (state->auth.token)
3327 			logdebugx("%s: validated using 0x%08" PRIu32,
3328 			    ifp->name, state->auth.token->secretid);
3329 		else
3330 			loginfox("%s: accepted reconfigure key", ifp->name);
3331 	} else if (ifo->auth.options & DHCPCD_AUTH_SEND) {
3332 		if (ifo->auth.options & DHCPCD_AUTH_REQUIRE) {
3333 			logerrx("%s: no authentication from %s",
3334 			    ifp->name, sfrom);
3335 			return;
3336 		}
3337 		logwarnx("%s: no authentication from %s", ifp->name, sfrom);
3338 	}
3339 #endif
3340 
3341 	op = dhcp6_get_op(r->type);
3342 	valid_op = op != NULL;
3343 	switch(r->type) {
3344 	case DHCP6_REPLY:
3345 		switch(state->state) {
3346 		case DH6S_INFORM:
3347 			if (dhcp6_checkstatusok(ifp, r, NULL, len) != 0)
3348 				return;
3349 			break;
3350 		case DH6S_CONFIRM:
3351 			if (dhcp6_validatelease(ifp, r, len, sfrom, NULL) == -1)
3352 			{
3353 				dhcp6_startdiscoinform(ifp);
3354 				return;
3355 			}
3356 			break;
3357 		case DH6S_DISCOVER:
3358 			/* Only accept REPLY in DISCOVER for RAPID_COMMIT.
3359 			 * Normally we get an ADVERTISE for a DISCOVER. */
3360 			if (!has_option_mask(ifo->requestmask6,
3361 			    D6_OPTION_RAPID_COMMIT) ||
3362 			    !dhcp6_findmoption(r, len, D6_OPTION_RAPID_COMMIT,
3363 					      NULL))
3364 			{
3365 				valid_op = false;
3366 				break;
3367 			}
3368 			/* Validate lease before setting state to REQUEST. */
3369 			/* FALLTHROUGH */
3370 		case DH6S_REQUEST: /* FALLTHROUGH */
3371 		case DH6S_RENEW: /* FALLTHROUGH */
3372 		case DH6S_REBIND:
3373 			if (dhcp6_validatelease(ifp, r, len, sfrom, NULL) == -1)
3374 			{
3375 				/*
3376 				 * If we can't use the lease, fallback to
3377 				 * DISCOVER and try and get a new one.
3378 				 *
3379 				 * This is needed become some servers
3380 				 * renumber the prefix or address
3381 				 * and deny the current one before it expires
3382 				 * rather than sending it back with a zero
3383 				 * lifetime along with the new prefix or
3384 				 * address to use.
3385 				 * This behavior is wrong, but moving to the
3386 				 * DISCOVER phase works around it.
3387 				 *
3388 				 * The currently held lease is still valid
3389 				 * until a new one is found.
3390 				 */
3391 				if (state->state != DH6S_DISCOVER)
3392 					dhcp6_startdiscoinform(ifp);
3393 				return;
3394 			}
3395 			/* RFC8415 18.2.10.1 */
3396 			if ((state->state == DH6S_RENEW ||
3397 			    state->state == DH6S_REBIND) &&
3398 			    state->has_no_binding)
3399 			{
3400 				dhcp6_startrequest(ifp);
3401 				return;
3402 			}
3403 			if (state->state == DH6S_DISCOVER)
3404 				state->state = DH6S_REQUEST;
3405 			break;
3406 		case DH6S_DECLINE:
3407 			/* This isnt really a failure, but an
3408 			 * acknowledgement of one. */
3409 			loginfox("%s: %s acknowledged DECLINE6",
3410 			    ifp->name, sfrom);
3411 			dhcp6_fail(ifp);
3412 			return;
3413 		default:
3414 			valid_op = false;
3415 			break;
3416 		}
3417 		break;
3418 	case DHCP6_ADVERTISE:
3419 		if (state->state != DH6S_DISCOVER) {
3420 			valid_op = false;
3421 			break;
3422 		}
3423 		/* RFC7083 */
3424 		o = dhcp6_findmoption(r, len, D6_OPTION_SOL_MAX_RT, &ol);
3425 		if (o && ol == sizeof(uint32_t)) {
3426 			uint32_t max_rt;
3427 
3428 			memcpy(&max_rt, o, sizeof(max_rt));
3429 			max_rt = ntohl(max_rt);
3430 			if (max_rt >= 60 && max_rt <= 86400) {
3431 				logdebugx("%s: SOL_MAX_RT %llu -> %u",
3432 				    ifp->name,
3433 				    (unsigned long long)state->sol_max_rt,
3434 				    max_rt);
3435 				state->sol_max_rt = max_rt;
3436 			} else
3437 				logerr("%s: invalid SOL_MAX_RT %u",
3438 				    ifp->name, max_rt);
3439 		}
3440 		o = dhcp6_findmoption(r, len, D6_OPTION_INF_MAX_RT, &ol);
3441 		if (o && ol == sizeof(uint32_t)) {
3442 			uint32_t max_rt;
3443 
3444 			memcpy(&max_rt, o, sizeof(max_rt));
3445 			max_rt = ntohl(max_rt);
3446 			if (max_rt >= 60 && max_rt <= 86400) {
3447 				logdebugx("%s: INF_MAX_RT %llu -> %u",
3448 				    ifp->name,
3449 				    (unsigned long long)state->inf_max_rt,
3450 				    max_rt);
3451 				state->inf_max_rt = max_rt;
3452 			} else
3453 				logerrx("%s: invalid INF_MAX_RT %u",
3454 				    ifp->name, max_rt);
3455 		}
3456 		if (dhcp6_validatelease(ifp, r, len, sfrom, NULL) == -1)
3457 			return;
3458 		break;
3459 	case DHCP6_RECONFIGURE:
3460 #ifdef AUTH
3461 		if (auth == NULL) {
3462 #endif
3463 			logerrx("%s: unauthenticated %s from %s",
3464 			    ifp->name, op, sfrom);
3465 			if (ifo->auth.options & DHCPCD_AUTH_REQUIRE)
3466 				return;
3467 #ifdef AUTH
3468 		}
3469 		loginfox("%s: %s from %s", ifp->name, op, sfrom);
3470 		o = dhcp6_findmoption(r, len, D6_OPTION_RECONF_MSG, &ol);
3471 		if (o == NULL) {
3472 			logerrx("%s: missing Reconfigure Message option",
3473 			    ifp->name);
3474 			return;
3475 		}
3476 		if (ol != 1) {
3477 			logerrx("%s: missing Reconfigure Message type",
3478 			    ifp->name);
3479 			return;
3480 		}
3481 		switch(*o) {
3482 		case DHCP6_RENEW:
3483 			if (state->state != DH6S_BOUND) {
3484 				logerrx("%s: not bound, ignoring %s",
3485 				    ifp->name, op);
3486 				return;
3487 			}
3488 			dhcp6_startrenew(ifp);
3489 			break;
3490 		case DHCP6_INFORMATION_REQ:
3491 			if (state->state != DH6S_INFORMED) {
3492 				logerrx("%s: not informed, ignoring %s",
3493 				    ifp->name, op);
3494 				return;
3495 			}
3496 			eloop_timeout_delete(ifp->ctx->eloop,
3497 			    dhcp6_sendinform, ifp);
3498 			dhcp6_startinform(ifp);
3499 			break;
3500 		default:
3501 			logerr("%s: unsupported %s type %d",
3502 			    ifp->name, op, *o);
3503 			break;
3504 		}
3505 		return;
3506 #else
3507 		break;
3508 #endif
3509 	default:
3510 		logerrx("%s: invalid DHCP6 type %s (%d)",
3511 		    ifp->name, op, r->type);
3512 		return;
3513 	}
3514 	if (!valid_op) {
3515 		logwarnx("%s: invalid state for DHCP6 type %s (%d)",
3516 		    ifp->name, op, r->type);
3517 		return;
3518 	}
3519 
3520 	if (state->recv_len < (size_t)len) {
3521 		free(state->recv);
3522 		state->recv = malloc(len);
3523 		if (state->recv == NULL) {
3524 			logerr(__func__);
3525 			return;
3526 		}
3527 	}
3528 	memcpy(state->recv, r, len);
3529 	state->recv_len = len;
3530 
3531 	if (r->type == DHCP6_ADVERTISE) {
3532 		struct ipv6_addr *ia;
3533 
3534 		if (state->state == DH6S_REQUEST) /* rapid commit */
3535 			goto bind;
3536 		TAILQ_FOREACH(ia, &state->addrs, next) {
3537 			if (!(ia->flags & (IPV6_AF_STALE | IPV6_AF_REQUEST)))
3538 				break;
3539 		}
3540 		if (ia == NULL)
3541 			ia = TAILQ_FIRST(&state->addrs);
3542 		if (ia == NULL)
3543 			loginfox("%s: ADV (no address) from %s",
3544 			    ifp->name, sfrom);
3545 		else
3546 			loginfox("%s: ADV %s from %s",
3547 			    ifp->name, ia->saddr, sfrom);
3548 		dhcp6_startrequest(ifp);
3549 		return;
3550 	}
3551 
3552 bind:
3553 	dhcp6_bind(ifp, op, sfrom);
3554 }
3555 
3556 void
3557 dhcp6_recvmsg(struct dhcpcd_ctx *ctx, struct msghdr *msg, struct ipv6_addr *ia)
3558 {
3559 	struct sockaddr_in6 *from = msg->msg_name;
3560 	size_t len = msg->msg_iov[0].iov_len;
3561 	char sfrom[INET6_ADDRSTRLEN];
3562 	struct interface *ifp;
3563 	struct dhcp6_message *r;
3564 	const struct dhcp6_state *state;
3565 	uint8_t *o;
3566 	uint16_t ol;
3567 
3568 	inet_ntop(AF_INET6, &from->sin6_addr, sfrom, sizeof(sfrom));
3569 	if (len < sizeof(struct dhcp6_message)) {
3570 		logerrx("DHCPv6 packet too short from %s", sfrom);
3571 		return;
3572 	}
3573 
3574 	if (ia != NULL)
3575 		ifp = ia->iface;
3576 	else {
3577 		ifp = if_findifpfromcmsg(ctx, msg, NULL);
3578 		if (ifp == NULL) {
3579 			logerr(__func__);
3580 			return;
3581 		}
3582 	}
3583 
3584 	r = (struct dhcp6_message *)msg->msg_iov[0].iov_base;
3585 
3586 	uint8_t duid[DUID_LEN], *dp;
3587 	size_t duid_len;
3588 	o = dhcp6_findmoption(r, len, D6_OPTION_CLIENTID, &ol);
3589 	if (ifp->options->options & DHCPCD_ANONYMOUS) {
3590 		duid_len = duid_make(duid, ifp, DUID_LL);
3591 		dp = duid;
3592 	} else {
3593 		duid_len = ctx->duid_len;
3594 		dp = ctx->duid;
3595 	}
3596 	if (o == NULL || ol != duid_len || memcmp(o, dp, ol) != 0) {
3597 		logdebugx("%s: incorrect client ID from %s",
3598 		    ifp->name, sfrom);
3599 		return;
3600 	}
3601 
3602 	if (dhcp6_findmoption(r, len, D6_OPTION_SERVERID, NULL) == NULL) {
3603 		logdebugx("%s: no DHCPv6 server ID from %s",
3604 		    ifp->name, sfrom);
3605 		return;
3606 	}
3607 
3608 	if (r->type == DHCP6_RECONFIGURE) {
3609 		if (!IN6_IS_ADDR_LINKLOCAL(&from->sin6_addr)) {
3610 			logerrx("%s: RECONFIGURE6 recv from %s, not LL",
3611 			    ifp->name, sfrom);
3612 			return;
3613 		}
3614 		goto recvif;
3615 	}
3616 
3617 	state = D6_CSTATE(ifp);
3618 	if (state == NULL ||
3619 	    r->xid[0] != state->send->xid[0] ||
3620 	    r->xid[1] != state->send->xid[1] ||
3621 	    r->xid[2] != state->send->xid[2])
3622 	{
3623 		struct interface *ifp1;
3624 		const struct dhcp6_state *state1;
3625 
3626 		/* Find an interface with a matching xid. */
3627 		TAILQ_FOREACH(ifp1, ctx->ifaces, next) {
3628 			state1 = D6_CSTATE(ifp1);
3629 			if (state1 == NULL || state1->send == NULL)
3630 				continue;
3631 			if (r->xid[0] == state1->send->xid[0] &&
3632 			    r->xid[1] == state1->send->xid[1] &&
3633 			    r->xid[2] == state1->send->xid[2])
3634 				break;
3635 		}
3636 
3637 		if (ifp1 == NULL) {
3638 			if (state != NULL)
3639 				logdebugx("%s: wrong xid 0x%02x%02x%02x"
3640 				    " (expecting 0x%02x%02x%02x) from %s",
3641 				    ifp->name,
3642 				    r->xid[0], r->xid[1], r->xid[2],
3643 				    state->send->xid[0],
3644 				    state->send->xid[1],
3645 				    state->send->xid[2],
3646 				    sfrom);
3647 			return;
3648 		}
3649 		logdebugx("%s: redirecting DHCP6 message to %s",
3650 		    ifp->name, ifp1->name);
3651 		ifp = ifp1;
3652 	}
3653 
3654 #if 0
3655 	/*
3656 	 * Handy code to inject raw DHCPv6 packets over responses
3657 	 * from our server.
3658 	 * This allows me to take a 3rd party wireshark trace and
3659 	 * replay it in my code.
3660 	 */
3661 	static int replyn = 0;
3662 	char fname[PATH_MAX], tbuf[UDPLEN_MAX];
3663 	int fd;
3664 	ssize_t tlen;
3665 	uint8_t *si1, *si2;
3666 	uint16_t si_len1, si_len2;
3667 
3668 	snprintf(fname, sizeof(fname),
3669 	    "/tmp/dhcp6.reply%d.raw", replyn++);
3670 	fd = open(fname, O_RDONLY, 0);
3671 	if (fd == -1) {
3672 		logerr("%s: open: %s", __func__, fname);
3673 		return;
3674 	}
3675 	tlen = read(fd, tbuf, sizeof(tbuf));
3676 	if (tlen == -1)
3677 		logerr("%s: read: %s", __func__, fname);
3678 	close(fd);
3679 
3680 	/* Copy across ServerID so we can work with our own server. */
3681 	si1 = dhcp6_findmoption(r, len, D6_OPTION_SERVERID, &si_len1);
3682 	si2 = dhcp6_findmoption(tbuf, (size_t)tlen,
3683 	    D6_OPTION_SERVERID, &si_len2);
3684 	if (si1 != NULL && si2 != NULL && si_len1 == si_len2)
3685 		memcpy(si2, si1, si_len2);
3686 	r = (struct dhcp6_message *)tbuf;
3687 	len = (size_t)tlen;
3688 #endif
3689 
3690 recvif:
3691 	dhcp6_recvif(ifp, sfrom, r, len);
3692 }
3693 
3694 static void
3695 dhcp6_recv(struct dhcpcd_ctx *ctx, struct ipv6_addr *ia)
3696 {
3697 	struct sockaddr_in6 from;
3698 	union {
3699 		struct dhcp6_message dhcp6;
3700 		uint8_t buf[UDPLEN_MAX]; /* Maximum UDP message size */
3701 	} iovbuf;
3702 	struct iovec iov = {
3703 		.iov_base = iovbuf.buf, .iov_len = sizeof(iovbuf.buf),
3704 	};
3705 	union {
3706 		struct cmsghdr hdr;
3707 		uint8_t buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
3708 	} cmsgbuf = { .buf = { 0 } };
3709 	struct msghdr msg = {
3710 	    .msg_name = &from, .msg_namelen = sizeof(from),
3711 	    .msg_iov = &iov, .msg_iovlen = 1,
3712 	    .msg_control = cmsgbuf.buf, .msg_controllen = sizeof(cmsgbuf.buf),
3713 	};
3714 	int s;
3715 	ssize_t bytes;
3716 
3717 	s = ia != NULL ? ia->dhcp6_fd : ctx->dhcp6_rfd;
3718 	bytes = recvmsg(s, &msg, 0);
3719 	if (bytes == -1) {
3720 		logerr(__func__);
3721 		return;
3722 	}
3723 
3724 	iov.iov_len = (size_t)bytes;
3725 	dhcp6_recvmsg(ctx, &msg, ia);
3726 }
3727 
3728 static void
3729 dhcp6_recvaddr(void *arg)
3730 {
3731 	struct ipv6_addr *ia = arg;
3732 
3733 	dhcp6_recv(ia->iface->ctx, ia);
3734 }
3735 
3736 static void
3737 dhcp6_recvctx(void *arg)
3738 {
3739 	struct dhcpcd_ctx *ctx = arg;
3740 
3741 	dhcp6_recv(ctx, NULL);
3742 }
3743 
3744 int
3745 dhcp6_openraw(void)
3746 {
3747 	int fd, v;
3748 
3749 	fd = socket(PF_INET6, SOCK_RAW | SOCK_CXNB, IPPROTO_UDP);
3750 	if (fd == -1)
3751 		return -1;
3752 
3753 	v = 1;
3754 	if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &v, sizeof(v)) == -1)
3755 		goto errexit;
3756 
3757 	v = offsetof(struct udphdr, uh_sum);
3758 	if (setsockopt(fd, IPPROTO_IPV6, IPV6_CHECKSUM, &v, sizeof(v)) == -1)
3759 		goto errexit;
3760 
3761 	return fd;
3762 
3763 errexit:
3764 	close(fd);
3765 	return -1;
3766 }
3767 
3768 int
3769 dhcp6_openudp(unsigned int ifindex, struct in6_addr *ia)
3770 {
3771 	struct sockaddr_in6 sa;
3772 	int n, s;
3773 
3774 	s = xsocket(PF_INET6, SOCK_DGRAM | SOCK_CXNB, IPPROTO_UDP);
3775 	if (s == -1)
3776 		goto errexit;
3777 
3778 	memset(&sa, 0, sizeof(sa));
3779 	sa.sin6_family = AF_INET6;
3780 	sa.sin6_port = htons(DHCP6_CLIENT_PORT);
3781 #ifdef BSD
3782 	sa.sin6_len = sizeof(sa);
3783 #endif
3784 
3785 	if (ia != NULL) {
3786 		memcpy(&sa.sin6_addr, ia, sizeof(sa.sin6_addr));
3787 		ipv6_setscope(&sa, ifindex);
3788 	}
3789 
3790 	if (bind(s, (struct sockaddr *)&sa, sizeof(sa)) == -1)
3791 		goto errexit;
3792 
3793 	n = 1;
3794 	if (setsockopt(s, IPPROTO_IPV6, IPV6_RECVPKTINFO, &n, sizeof(n)) == -1)
3795 		goto errexit;
3796 
3797 #ifdef SO_RERROR
3798 	n = 1;
3799 	if (setsockopt(s, SOL_SOCKET, SO_RERROR, &n, sizeof(n)) == -1)
3800 		goto errexit;
3801 #endif
3802 
3803 	return s;
3804 
3805 errexit:
3806 	logerr(__func__);
3807 	if (s != -1)
3808 		close(s);
3809 	return -1;
3810 }
3811 
3812 #ifndef SMALL
3813 static void
3814 dhcp6_activateinterfaces(struct interface *ifp)
3815 {
3816 	struct interface *ifd;
3817 	size_t i, j;
3818 	struct if_ia *ia;
3819 	struct if_sla *sla;
3820 
3821 	for (i = 0; i < ifp->options->ia_len; i++) {
3822 		ia = &ifp->options->ia[i];
3823 		if (ia->ia_type != D6_OPTION_IA_PD)
3824 			continue;
3825 		for (j = 0; j < ia->sla_len; j++) {
3826 			sla = &ia->sla[j];
3827 			ifd = if_find(ifp->ctx->ifaces, sla->ifname);
3828 			if (ifd == NULL) {
3829 				logwarn("%s: cannot delegate to %s",
3830 				    ifp->name, sla->ifname);
3831 				continue;
3832 			}
3833 			if (!ifd->active) {
3834 				loginfox("%s: activating for delegation",
3835 				    sla->ifname);
3836 				dhcpcd_activateinterface(ifd,
3837 				    DHCPCD_IPV6 | DHCPCD_DHCP6);
3838 			}
3839 		}
3840 	}
3841 }
3842 #endif
3843 
3844 static void
3845 dhcp6_start1(void *arg)
3846 {
3847 	struct interface *ifp = arg;
3848 	struct dhcpcd_ctx *ctx = ifp->ctx;
3849 	struct if_options *ifo = ifp->options;
3850 	struct dhcp6_state *state;
3851 	size_t i;
3852 	const struct dhcp_compat *dhc;
3853 
3854 	if ((ctx->options & (DHCPCD_MASTER|DHCPCD_PRIVSEP)) == DHCPCD_MASTER &&
3855 	    ctx->dhcp6_rfd == -1)
3856 	{
3857 		ctx->dhcp6_rfd = dhcp6_openudp(0, NULL);
3858 		if (ctx->dhcp6_rfd == -1) {
3859 			logerr(__func__);
3860 			return;
3861 		}
3862 		eloop_event_add(ctx->eloop, ctx->dhcp6_rfd, dhcp6_recvctx, ctx);
3863 	}
3864 
3865 	if (!IN_PRIVSEP(ctx) && ctx->dhcp6_wfd == -1) {
3866 		ctx->dhcp6_wfd = dhcp6_openraw();
3867 		if (ctx->dhcp6_wfd == -1) {
3868 			logerr(__func__);
3869 			return;
3870 		}
3871 	}
3872 
3873 	state = D6_STATE(ifp);
3874 	/* If no DHCPv6 options are configured,
3875 	   match configured DHCPv4 options to DHCPv6 equivalents. */
3876 	for (i = 0; i < sizeof(ifo->requestmask6); i++) {
3877 		if (ifo->requestmask6[i] != '\0')
3878 			break;
3879 	}
3880 	if (i == sizeof(ifo->requestmask6)) {
3881 		for (dhc = dhcp_compats; dhc->dhcp_opt; dhc++) {
3882 			if (DHC_REQ(ifo->requestmask, ifo->nomask, dhc->dhcp_opt))
3883 				add_option_mask(ifo->requestmask6,
3884 				    dhc->dhcp6_opt);
3885 		}
3886 		if (ifo->fqdn != FQDN_DISABLE || ifo->options & DHCPCD_HOSTNAME)
3887 			add_option_mask(ifo->requestmask6, D6_OPTION_FQDN);
3888 	}
3889 
3890 #ifndef SMALL
3891 	/* Rapid commit won't work with Prefix Delegation Exclusion */
3892 	if (dhcp6_findselfsla(ifp))
3893 		del_option_mask(ifo->requestmask6, D6_OPTION_RAPID_COMMIT);
3894 #endif
3895 
3896 	if (state->state == DH6S_INFORM) {
3897 		add_option_mask(ifo->requestmask6, D6_OPTION_INFO_REFRESH_TIME);
3898 		dhcp6_startinform(ifp);
3899 	} else {
3900 		del_option_mask(ifo->requestmask6, D6_OPTION_INFO_REFRESH_TIME);
3901 		dhcp6_startinit(ifp);
3902 	}
3903 
3904 #ifndef SMALL
3905 	dhcp6_activateinterfaces(ifp);
3906 #endif
3907 }
3908 
3909 int
3910 dhcp6_start(struct interface *ifp, enum DH6S init_state)
3911 {
3912 	struct dhcp6_state *state;
3913 
3914 	state = D6_STATE(ifp);
3915 	if (state != NULL) {
3916 		switch (init_state) {
3917 		case DH6S_INIT:
3918 			goto gogogo;
3919 		case DH6S_INFORM:
3920 			if (state->state == DH6S_INIT ||
3921 			    state->state == DH6S_INFORMED ||
3922 			    (state->state == DH6S_DISCOVER &&
3923 			    !(ifp->options->options & DHCPCD_IA_FORCED) &&
3924 			    !ipv6nd_hasradhcp(ifp, true)))
3925 				dhcp6_startinform(ifp);
3926 			break;
3927 		case DH6S_REQUEST:
3928 			if (ifp->options->options & DHCPCD_DHCP6 &&
3929 			    (state->state == DH6S_INIT ||
3930 			     state->state == DH6S_INFORM ||
3931 			     state->state == DH6S_INFORMED ||
3932 			     state->state == DH6S_DELEGATED))
3933 			{
3934 				/* Change from stateless to stateful */
3935 				init_state = DH6S_INIT;
3936 				goto gogogo;
3937 			}
3938 			break;
3939 		case DH6S_CONFIRM:
3940 			init_state = DH6S_INIT;
3941 			goto gogogo;
3942 		default:
3943 			/* Not possible, but sushes some compiler warnings. */
3944 			break;
3945 		}
3946 		return 0;
3947 	} else {
3948 		switch (init_state) {
3949 		case DH6S_CONFIRM:
3950 			/* No DHCPv6 config, no existing state
3951 			 * so nothing to do. */
3952 			return 0;
3953 		case DH6S_INFORM:
3954 			break;
3955 		default:
3956 			init_state = DH6S_INIT;
3957 			break;
3958 		}
3959 	}
3960 
3961 	if (!(ifp->options->options & DHCPCD_DHCP6))
3962 		return 0;
3963 
3964 	ifp->if_data[IF_DATA_DHCP6] = calloc(1, sizeof(*state));
3965 	state = D6_STATE(ifp);
3966 	if (state == NULL)
3967 		return -1;
3968 
3969 	state->sol_max_rt = SOL_MAX_RT;
3970 	state->inf_max_rt = INF_MAX_RT;
3971 	TAILQ_INIT(&state->addrs);
3972 
3973 gogogo:
3974 	state->state = init_state;
3975 	state->lerror = 0;
3976 	state->failed = false;
3977 	dhcp_set_leasefile(state->leasefile, sizeof(state->leasefile),
3978 	    AF_INET6, ifp);
3979 	if (ipv6_linklocal(ifp) == NULL) {
3980 		logdebugx("%s: delaying DHCPv6 for LL address", ifp->name);
3981 		ipv6_addlinklocalcallback(ifp, dhcp6_start1, ifp);
3982 		return 0;
3983 	}
3984 
3985 	dhcp6_start1(ifp);
3986 	return 0;
3987 }
3988 
3989 void
3990 dhcp6_reboot(struct interface *ifp)
3991 {
3992 	struct dhcp6_state *state;
3993 
3994 	state = D6_STATE(ifp);
3995 	if (state == NULL)
3996 		return;
3997 
3998 	state->lerror = 0;
3999 	switch (state->state) {
4000 	case DH6S_BOUND:
4001 		dhcp6_startrebind(ifp);
4002 		break;
4003 	default:
4004 		dhcp6_startdiscoinform(ifp);
4005 		break;
4006 	}
4007 }
4008 
4009 static void
4010 dhcp6_freedrop(struct interface *ifp, int drop, const char *reason)
4011 {
4012 	struct dhcp6_state *state;
4013 	struct dhcpcd_ctx *ctx;
4014 	unsigned long long options;
4015 
4016 	if (ifp->options)
4017 		options = ifp->options->options;
4018 	else
4019 		options = ifp->ctx->options;
4020 
4021 	if (ifp->ctx->eloop)
4022 		eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp);
4023 
4024 #ifndef SMALL
4025 	/* If we're dropping the lease, drop delegated addresses.
4026 	 * If, for whatever reason, we don't drop them in the future
4027 	 * then they should at least be marked as deprecated (pltime 0). */
4028 	if (drop && (options & DHCPCD_NODROP) != DHCPCD_NODROP)
4029 		dhcp6_delete_delegates(ifp);
4030 #endif
4031 
4032 	state = D6_STATE(ifp);
4033 	if (state) {
4034 		/* Failure to send the release may cause this function to
4035 		 * re-enter */
4036 		if (state->state == DH6S_RELEASE) {
4037 			dhcp6_finishrelease(ifp);
4038 			return;
4039 		}
4040 
4041 		if (drop && options & DHCPCD_RELEASE &&
4042 		    state->state != DH6S_DELEGATED)
4043 		{
4044 			if (if_is_link_up(ifp) &&
4045 			    state->state != DH6S_RELEASED &&
4046 			    state->state != DH6S_INFORMED)
4047 			{
4048 				dhcp6_startrelease(ifp);
4049 				return;
4050 			}
4051 			dhcp_unlink(ifp->ctx, state->leasefile);
4052 		}
4053 #ifdef AUTH
4054 		else if (state->auth.reconf != NULL) {
4055 			/*
4056 			 * Drop the lease as the token may only be present
4057 			 * in the initial reply message and not subsequent
4058 			 * renewals.
4059 			 * If dhcpcd is restarted, the token is lost.
4060 			 * XXX persist this in another file?
4061 			 */
4062 			dhcp_unlink(ifp->ctx, state->leasefile);
4063 		}
4064 #endif
4065 
4066 		dhcp6_freedrop_addrs(ifp, drop, NULL);
4067 		free(state->old);
4068 		state->old = state->new;
4069 		state->old_len = state->new_len;
4070 		state->new = NULL;
4071 		state->new_len = 0;
4072 		if (drop && state->old &&
4073 		    (options & DHCPCD_NODROP) != DHCPCD_NODROP)
4074 		{
4075 			if (reason == NULL)
4076 				reason = "STOP6";
4077 			script_runreason(ifp, reason);
4078 		}
4079 		free(state->old);
4080 		free(state->send);
4081 		free(state->recv);
4082 		free(state);
4083 		ifp->if_data[IF_DATA_DHCP6] = NULL;
4084 	}
4085 
4086 	/* If we don't have any more DHCP6 enabled interfaces,
4087 	 * close the global socket and release resources */
4088 	ctx = ifp->ctx;
4089 	if (ctx->ifaces) {
4090 		TAILQ_FOREACH(ifp, ctx->ifaces, next) {
4091 			if (D6_STATE(ifp))
4092 				break;
4093 		}
4094 	}
4095 	if (ifp == NULL && ctx->dhcp6_rfd != -1) {
4096 		eloop_event_delete(ctx->eloop, ctx->dhcp6_rfd);
4097 		close(ctx->dhcp6_rfd);
4098 		ctx->dhcp6_rfd = -1;
4099 	}
4100 }
4101 
4102 void
4103 dhcp6_drop(struct interface *ifp, const char *reason)
4104 {
4105 
4106 	dhcp6_freedrop(ifp, 1, reason);
4107 }
4108 
4109 void
4110 dhcp6_free(struct interface *ifp)
4111 {
4112 
4113 	dhcp6_freedrop(ifp, 0, NULL);
4114 }
4115 
4116 void
4117 dhcp6_abort(struct interface *ifp)
4118 {
4119 	struct dhcp6_state *state;
4120 #ifdef ND6_ADVERTISE
4121 	struct ipv6_addr *ia;
4122 #endif
4123 
4124 	eloop_timeout_delete(ifp->ctx->eloop, dhcp6_start1, ifp);
4125 	state = D6_STATE(ifp);
4126 	if (state == NULL)
4127 		return;
4128 
4129 #ifdef ND6_ADVERTISE
4130 	TAILQ_FOREACH(ia, &state->addrs, next) {
4131 		ipv6nd_advertise(ia);
4132 	}
4133 #endif
4134 
4135 	eloop_timeout_delete(ifp->ctx->eloop, dhcp6_startdiscover, ifp);
4136 	eloop_timeout_delete(ifp->ctx->eloop, dhcp6_senddiscover, ifp);
4137 	eloop_timeout_delete(ifp->ctx->eloop, dhcp6_startinform, ifp);
4138 	eloop_timeout_delete(ifp->ctx->eloop, dhcp6_sendinform, ifp);
4139 
4140 	switch (state->state) {
4141 	case DH6S_DISCOVER:	/* FALLTHROUGH */
4142 	case DH6S_REQUEST:	/* FALLTHROUGH */
4143 	case DH6S_INFORM:
4144 		state->state = DH6S_INIT;
4145 		break;
4146 	default:
4147 		break;
4148 	}
4149 }
4150 
4151 void
4152 dhcp6_handleifa(int cmd, struct ipv6_addr *ia, pid_t pid)
4153 {
4154 	struct dhcp6_state *state;
4155 	struct interface *ifp = ia->iface;
4156 
4157 	/* If not running in master mode, listen to this address */
4158 	if (cmd == RTM_NEWADDR &&
4159 	    !(ia->addr_flags & IN6_IFF_NOTUSEABLE) &&
4160 	    ifp->active == IF_ACTIVE_USER &&
4161 	    !(ifp->ctx->options & DHCPCD_MASTER) &&
4162 	    ifp->options->options & DHCPCD_DHCP6)
4163 	{
4164 #ifdef PRIVSEP
4165 		if (IN_PRIVSEP_SE(ifp->ctx)) {
4166 			if (ps_inet_opendhcp6(ia) == -1)
4167 				logerr(__func__);
4168 		} else
4169 #endif
4170 		{
4171 			if (ia->dhcp6_fd == -1)
4172 				ia->dhcp6_fd = dhcp6_openudp(ia->iface->index,
4173 				    &ia->addr);
4174 			if (ia->dhcp6_fd != -1)
4175 				eloop_event_add(ia->iface->ctx->eloop,
4176 				ia->dhcp6_fd, dhcp6_recvaddr, ia);
4177 		}
4178 	}
4179 
4180 
4181 	if ((state = D6_STATE(ifp)) != NULL)
4182 		ipv6_handleifa_addrs(cmd, &state->addrs, ia, pid);
4183 }
4184 
4185 ssize_t
4186 dhcp6_env(FILE *fp, const char *prefix, const struct interface *ifp,
4187     const struct dhcp6_message *m, size_t len)
4188 {
4189 	const struct if_options *ifo;
4190 	struct dhcp_opt *opt, *vo;
4191 	const uint8_t *p;
4192 	struct dhcp6_option o;
4193 	size_t i;
4194 	char *pfx;
4195 	uint32_t en;
4196 	const struct dhcpcd_ctx *ctx;
4197 #ifndef SMALL
4198 	const struct dhcp6_state *state;
4199 	const struct ipv6_addr *ap;
4200 #endif
4201 
4202 	if (m == NULL)
4203 		goto delegated;
4204 
4205 	if (len < sizeof(*m)) {
4206 		/* Should be impossible with guards at packet in
4207 		 * and reading leases */
4208 		errno = EINVAL;
4209 		return -1;
4210 	}
4211 
4212 	ifo = ifp->options;
4213 	ctx = ifp->ctx;
4214 
4215 	/* Zero our indexes */
4216 	for (i = 0, opt = ctx->dhcp6_opts;
4217 	    i < ctx->dhcp6_opts_len;
4218 	    i++, opt++)
4219 		dhcp_zero_index(opt);
4220 	for (i = 0, opt = ifp->options->dhcp6_override;
4221 	    i < ifp->options->dhcp6_override_len;
4222 	    i++, opt++)
4223 		dhcp_zero_index(opt);
4224 	for (i = 0, opt = ctx->vivso;
4225 	    i < ctx->vivso_len;
4226 	    i++, opt++)
4227 		dhcp_zero_index(opt);
4228 	if (asprintf(&pfx, "%s_dhcp6", prefix) == -1)
4229 		return -1;
4230 
4231 	/* Unlike DHCP, DHCPv6 options *may* occur more than once.
4232 	 * There is also no provision for option concatenation unlike DHCP. */
4233 	p = (const uint8_t *)m + sizeof(*m);
4234 	len -= sizeof(*m);
4235 	for (; len != 0; p += o.len, len -= o.len) {
4236 		if (len < sizeof(o)) {
4237 			errno = EINVAL;
4238 			break;
4239 		}
4240 		memcpy(&o, p, sizeof(o));
4241 		p += sizeof(o);
4242 		len -= sizeof(o);
4243 		o.len = ntohs(o.len);
4244 		if (len < o.len) {
4245 			errno =	EINVAL;
4246 			break;
4247 		}
4248 		o.code = ntohs(o.code);
4249 		if (has_option_mask(ifo->nomask6, o.code))
4250 			continue;
4251 		for (i = 0, opt = ifo->dhcp6_override;
4252 		    i < ifo->dhcp6_override_len;
4253 		    i++, opt++)
4254 			if (opt->option == o.code)
4255 				break;
4256 		if (i == ifo->dhcp6_override_len &&
4257 		    o.code == D6_OPTION_VENDOR_OPTS &&
4258 		    o.len > sizeof(en))
4259 		{
4260 			memcpy(&en, p, sizeof(en));
4261 			en = ntohl(en);
4262 			vo = vivso_find(en, ifp);
4263 		} else
4264 			vo = NULL;
4265 		if (i == ifo->dhcp6_override_len) {
4266 			for (i = 0, opt = ctx->dhcp6_opts;
4267 			    i < ctx->dhcp6_opts_len;
4268 			    i++, opt++)
4269 				if (opt->option == o.code)
4270 					break;
4271 			if (i == ctx->dhcp6_opts_len)
4272 				opt = NULL;
4273 		}
4274 		if (opt) {
4275 			dhcp_envoption(ifp->ctx,
4276 			    fp, pfx, ifp->name,
4277 			    opt, dhcp6_getoption, p, o.len);
4278 		}
4279 		if (vo) {
4280 			dhcp_envoption(ifp->ctx,
4281 			    fp, pfx, ifp->name,
4282 			    vo, dhcp6_getoption,
4283 			    p + sizeof(en),
4284 			    o.len - sizeof(en));
4285 		}
4286 	}
4287 	free(pfx);
4288 
4289 delegated:
4290 #ifndef SMALL
4291         /* Needed for Delegated Prefixes */
4292 	state = D6_CSTATE(ifp);
4293 	TAILQ_FOREACH(ap, &state->addrs, next) {
4294 		if (ap->delegating_prefix)
4295 			break;
4296 	}
4297 	if (ap == NULL)
4298 		return 1;
4299 	if (fprintf(fp, "%s_delegated_dhcp6_prefix=", prefix) == -1)
4300 		return -1;
4301 	TAILQ_FOREACH(ap, &state->addrs, next) {
4302 		if (ap->delegating_prefix == NULL)
4303 			continue;
4304 		if (ap != TAILQ_FIRST(&state->addrs)) {
4305 			if (fputc(' ', fp) == EOF)
4306 				return -1;
4307 		}
4308 		if (fprintf(fp, "%s", ap->saddr) == -1)
4309 			return -1;
4310         }
4311 	if (fputc('\0', fp) == EOF)
4312 		return -1;
4313 #endif
4314 
4315 	return 1;
4316 }
4317 #endif
4318 
4319 #ifndef SMALL
4320 int
4321 dhcp6_dump(struct interface *ifp)
4322 {
4323 	struct dhcp6_state *state;
4324 
4325 	ifp->if_data[IF_DATA_DHCP6] = state = calloc(1, sizeof(*state));
4326 	if (state == NULL) {
4327 		logerr(__func__);
4328 		return -1;
4329 	}
4330 	TAILQ_INIT(&state->addrs);
4331 	if (dhcp6_readlease(ifp, 0) == -1) {
4332 		logerr("dhcp6_readlease");
4333 		return -1;
4334 	}
4335 	state->reason = "DUMP6";
4336 	return script_runreason(ifp, state->reason);
4337 }
4338 #endif
4339