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dhcpv6: allow flash renumbering in hybrid management mode
[project/odhcpd.git] / src / dhcpv6-ia.c
1 /**
2 * Copyright (C) 2013 Steven Barth <steven@midlink.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 */
14
15 #include "odhcpd.h"
16 #include "dhcpv6.h"
17 #include "dhcpv4.h"
18 #include "libubox/md5.h"
19 #include "libubox/usock.h"
20
21 #include <time.h>
22 #include <errno.h>
23 #include <fcntl.h>
24 #include <stdio.h>
25 #include <poll.h>
26 #include <alloca.h>
27 #include <resolv.h>
28 #include <limits.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <unistd.h>
32 #include <stdbool.h>
33 #include <arpa/inet.h>
34 #include <sys/timerfd.h>
35
36
37 static void update(struct interface *iface);
38 static void reconf_timer(struct uloop_timeout *event);
39 static struct uloop_timeout reconf_event = {.cb = reconf_timer};
40 static uint32_t serial = 0;
41 static uint8_t statemd5[16];
42
43
44 int dhcpv6_ia_init(void)
45 {
46 uloop_timeout_set(&reconf_event, 2000);
47 return 0;
48 }
49
50
51 void free_dhcpv6_assignment(struct dhcpv6_assignment *c)
52 {
53 if (c->managed_sock.fd.registered) {
54 ustream_free(&c->managed_sock.stream);
55 close(c->managed_sock.fd.fd);
56 }
57
58 if (c->head.next)
59 list_del(&c->head);
60
61 free(c->managed);
62 free(c->hostname);
63 free(c->classes);
64 free(c);
65 }
66
67
68 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
69 {
70 if (!enable && iface->ia_assignments.next) {
71 struct dhcpv6_assignment *c;
72 while (!list_empty(&iface->ia_assignments)) {
73 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
74 free_dhcpv6_assignment(c);
75 }
76 }
77
78 if (iface->dhcpv6 == RELAYD_SERVER) {
79 if (!iface->ia_assignments.next)
80 INIT_LIST_HEAD(&iface->ia_assignments);
81
82 if (list_empty(&iface->ia_assignments)) {
83 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
84 if (!border) {
85 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
86 return -1;
87 }
88
89 border->length = 64;
90 list_add(&border->head, &iface->ia_assignments);
91 }
92
93 update(iface);
94
95 // Parse static entries
96 struct lease *lease;
97 list_for_each_entry(lease, &leases, head) {
98 // Construct entry
99 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + lease->duid_len);
100 if (!a) {
101 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
102 iface->ifname);
103 return -1;
104 }
105
106 a->clid_len = lease->duid_len;
107 a->length = 128;
108 if (lease->hostid) {
109 a->assigned = lease->hostid;
110 } else {
111 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
112 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
113 }
114 odhcpd_urandom(a->key, sizeof(a->key));
115 memcpy(a->clid_data, lease->duid, a->clid_len);
116 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
117
118 // Assign to all interfaces
119 struct dhcpv6_assignment *c;
120 list_for_each_entry(c, &iface->ia_assignments, head) {
121 if (c->length != 128 || c->assigned > a->assigned) {
122 list_add_tail(&a->head, &c->head);
123 break;
124 } else if (c->assigned == a->assigned) {
125 // Already an assignment with that number
126 break;
127 }
128 }
129
130 if (a->head.next) {
131 if (lease->hostname[0]) {
132 free(a->hostname);
133 a->hostname = strdup(lease->hostname);
134 }
135 } else {
136 free(a->classes);
137 free(a->hostname);
138 free(a);
139 }
140 }
141 }
142 return 0;
143 }
144
145
146 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
147 {
148 struct {
149 struct dhcpv6_client_header hdr;
150 uint16_t srvid_type;
151 uint16_t srvid_len;
152 uint16_t duid_type;
153 uint16_t hardware_type;
154 uint8_t mac[6];
155 uint16_t msg_type;
156 uint16_t msg_len;
157 uint8_t msg_id;
158 struct dhcpv6_auth_reconfigure auth;
159 uint16_t clid_type;
160 uint16_t clid_len;
161 uint8_t clid_data[128];
162 } __attribute__((packed)) reconf_msg = {
163 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
164 .srvid_type = htons(DHCPV6_OPT_SERVERID),
165 .srvid_len = htons(10),
166 .duid_type = htons(3),
167 .hardware_type = htons(1),
168 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
169 .msg_len = htons(1),
170 .msg_id = DHCPV6_MSG_RENEW,
171 .auth = {htons(DHCPV6_OPT_AUTH),
172 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
173 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
174 .clid_type = htons(DHCPV6_OPT_CLIENTID),
175 .clid_len = htons(assign->clid_len),
176 .clid_data = {0},
177 };
178
179 odhcpd_get_mac(iface, reconf_msg.mac);
180 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
181 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
182
183 md5_ctx_t md5;
184 uint8_t secretbytes[64];
185 memset(secretbytes, 0, sizeof(secretbytes));
186 memcpy(secretbytes, assign->key, sizeof(assign->key));
187
188 for (size_t i = 0; i < sizeof(secretbytes); ++i)
189 secretbytes[i] ^= 0x36;
190
191 md5_begin(&md5);
192 md5_hash(secretbytes, sizeof(secretbytes), &md5);
193 md5_hash(iov.iov_base, iov.iov_len, &md5);
194 md5_end(reconf_msg.auth.key, &md5);
195
196 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
197 secretbytes[i] ^= 0x36;
198 secretbytes[i] ^= 0x5c;
199 }
200
201 md5_begin(&md5);
202 md5_hash(secretbytes, sizeof(secretbytes), &md5);
203 md5_hash(reconf_msg.auth.key, 16, &md5);
204 md5_end(reconf_msg.auth.key, &md5);
205
206 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
207 }
208
209
210 void dhcpv6_write_statefile(void)
211 {
212 md5_ctx_t md5;
213 md5_begin(&md5);
214
215 if (config.dhcp_statefile) {
216 time_t now = odhcpd_time(), wall_time = time(NULL);
217 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
218 if (fd < 0)
219 return;
220
221 lockf(fd, F_LOCK, 0);
222 ftruncate(fd, 0);
223
224 FILE *fp = fdopen(fd, "w");
225 if (!fp) {
226 close(fd);
227 return;
228 }
229
230 struct interface *iface;
231 list_for_each_entry(iface, &interfaces, head) {
232 if (iface->dhcpv6 != RELAYD_SERVER && iface->dhcpv4 != RELAYD_SERVER)
233 continue;
234
235 if (iface->dhcpv6 == RELAYD_SERVER && iface->ia_assignments.next) {
236 struct dhcpv6_assignment *c;
237 list_for_each_entry(c, &iface->ia_assignments, head) {
238 if (c->clid_len == 0 || c->managed_size < 0)
239 continue;
240
241 char ipbuf[INET6_ADDRSTRLEN];
242 char leasebuf[512];
243 char duidbuf[264];
244 odhcpd_hexlify(duidbuf, c->clid_data, c->clid_len);
245
246 // iface DUID iaid hostname lifetime assigned length [addrs...]
247 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s %x %s %u %x %u ",
248 iface->ifname, duidbuf, ntohl(c->iaid),
249 (c->hostname ? c->hostname : "-"),
250 (unsigned)(c->valid_until > now ?
251 (c->valid_until - now + wall_time) : 0),
252 c->assigned, (unsigned)c->length);
253
254 struct in6_addr addr;
255 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr;
256 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len;
257
258 for (size_t i = 0; i < addrlen; ++i) {
259 if (addrs[i].prefix > 96)
260 continue;
261 if (c->valid_until <= now)
262 continue;
263
264 addr = addrs[i].addr;
265 if (c->length == 128)
266 addr.s6_addr32[3] = htonl(c->assigned);
267 else
268 addr.s6_addr32[1] |= htonl(c->assigned);
269
270 inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1);
271
272 if (c->length == 128 && c->hostname) {
273 fputs(ipbuf, fp);
274
275 char b[256];
276 if (dn_expand(iface->search, iface->search + iface->search_len,
277 iface->search, b, sizeof(b)) > 0)
278 fprintf(fp, "\t%s.%s", c->hostname, b);
279
280 fprintf(fp, "\t%s\n", c->hostname);
281 md5_hash(ipbuf, strlen(ipbuf), &md5);
282 md5_hash(c->hostname, strlen(c->hostname), &md5);
283 }
284
285 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%d ", ipbuf,
286 (c->managed_size) ? addrs[i].prefix : c->length);
287 }
288 leasebuf[l - 1] = '\n';
289 fwrite(leasebuf, 1, l, fp);
290 }
291 }
292
293 if (iface->dhcpv4 == RELAYD_SERVER && iface->dhcpv4_assignments.next) {
294 struct dhcpv4_assignment *c;
295 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
296 char ipbuf[INET6_ADDRSTRLEN];
297 char leasebuf[512];
298 char duidbuf[16];
299 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
300
301 // iface DUID iaid hostname lifetime assigned length [addrs...]
302 int l = snprintf(leasebuf, sizeof(leasebuf), "# %s %s ipv4 %s %u %x 32 ",
303 iface->ifname, duidbuf,
304 (c->hostname ? c->hostname : "-"),
305 (unsigned)(c->valid_until > now ?
306 (c->valid_until - now + wall_time) : 0),
307 c->addr);
308
309 struct in_addr addr = {htonl(c->addr)};
310 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
311
312 if (c->hostname[0]) {
313 fputs(ipbuf, fp);
314
315 char b[256];
316 if (dn_expand(iface->search, iface->search + iface->search_len,
317 iface->search, b, sizeof(b)) > 0)
318 fprintf(fp, "\t%s.%s", c->hostname, b);
319
320 fprintf(fp, "\t%s\n", c->hostname);
321 md5_hash(ipbuf, strlen(ipbuf), &md5);
322 md5_hash(c->hostname, strlen(c->hostname), &md5);
323 }
324
325 l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf);
326 leasebuf[l - 1] = '\n';
327 fwrite(leasebuf, 1, l, fp);
328 }
329 }
330 }
331
332 fclose(fp);
333 }
334
335 uint8_t newmd5[16];
336 md5_end(newmd5, &md5);
337
338 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
339 memcpy(statemd5, newmd5, sizeof(statemd5));
340 char *argv[2] = {config.dhcp_cb, NULL};
341 if (!vfork()) {
342 execv(argv[0], argv);
343 _exit(128);
344 }
345 }
346 }
347
348
349 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
350 {
351 if (a->length > 64 || a->managed_size < 0)
352 return;
353
354 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
355 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
356
357 for (size_t i = 0; i < addrlen; ++i) {
358 struct in6_addr prefix = addrs[i].addr;
359 prefix.s6_addr32[1] |= htonl(a->assigned);
360 odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
361 iface, &a->peer.sin6_addr, add);
362 }
363 }
364
365
366 // More data was received from TCP connection
367 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
368 {
369 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
370 time_t now = odhcpd_time();
371 bool first = c->managed_size < 0;
372
373 for (;;) {
374 int pending;
375 char *data = ustream_get_read_buf(s, &pending);
376 char *end = memmem(data, pending, "\n\n", 2);
377
378 if (!end)
379 break;
380
381 end += 2;
382 end[-1] = 0;
383
384 c->managed_size = 0;
385 if (c->accept_reconf)
386 c->reconf_cnt = 1;
387
388 char *saveptr;
389 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
390 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
391 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
392
393 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
394 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
395 continue;
396
397 x = strtok_r(NULL, ",", &saveptr2);
398 if (sscanf(x, "%hhu", &n->prefix) < 1)
399 continue;
400
401 x = strtok_r(NULL, ",", &saveptr2);
402 if (sscanf(x, "%u", &n->preferred) < 1)
403 continue;
404
405 x = strtok_r(NULL, ",", &saveptr2);
406 if (sscanf(x, "%u", &n->valid) < 1)
407 continue;
408
409 if (n->preferred > n->valid)
410 continue;
411
412 if (UINT32_MAX - now < n->preferred)
413 n->preferred = UINT32_MAX;
414 else
415 n->preferred += now;
416
417 if (UINT32_MAX - now < n->valid)
418 n->valid = UINT32_MAX;
419 else
420 n->valid += now;
421
422 n->has_class = false;
423 n->class = 0;
424 n->dprefix = 0;
425
426 ++c->managed_size;
427 }
428
429 ustream_consume(s, end - data);
430 }
431
432 if (first && c->managed_size == 0)
433 free_dhcpv6_assignment(c);
434 else if (first)
435 c->valid_until = now + 150;
436 }
437
438
439 // TCP transmission has ended, either because of success or timeout or other error
440 static void managed_handle_pd_done(struct ustream *s)
441 {
442 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
443 c->valid_until = odhcpd_time() + 15;
444 c->managed_size = 0;
445 if (c->accept_reconf)
446 c->reconf_cnt = 1;
447 }
448
449
450
451 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
452 {
453 struct dhcpv6_assignment *c;
454
455 if (iface->dhcpv6_pd_manager[0]) {
456 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
457 if (fd >= 0) {
458 char iaidbuf[298];
459 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
460
461 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
462 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
463 ustream_fd_init(&assign->managed_sock, fd);
464 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
465 iaidbuf, assign->iaid, assign->length);
466 ustream_write_pending(&assign->managed_sock.stream);
467 assign->managed_size = -1;
468 assign->valid_until = odhcpd_time() + 15;
469 list_add(&assign->head, &iface->ia_assignments);
470
471 // Wait initial period of up to 250ms for immediate assignment
472 struct pollfd pfd = { .fd = fd, .events = POLLIN };
473 poll(&pfd, 1, 250);
474 managed_handle_pd_data(&assign->managed_sock.stream, 0);
475
476 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
477 return true;
478 }
479
480 return false;
481 } else if (iface->ia_addr_len < 1) {
482 return false;
483 }
484
485 // Try honoring the hint first
486 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
487 if (assign->assigned) {
488 list_for_each_entry(c, &iface->ia_assignments, head) {
489 if (c->length == 128 || c->length == 0)
490 continue;
491
492 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
493 list_add_tail(&assign->head, &c->head);
494 apply_lease(iface, assign, true);
495 return true;
496 }
497
498 if (c->assigned != 0)
499 current = (c->assigned + (1 << (64 - c->length)));
500 }
501 }
502
503 // Fallback to a variable assignment
504 current = 1;
505 list_for_each_entry(c, &iface->ia_assignments, head) {
506 if (c->length == 128 || c->length == 0)
507 continue;
508
509 current = (current + asize) & (~asize);
510 if (current + asize < c->assigned) {
511 assign->assigned = current;
512 list_add_tail(&assign->head, &c->head);
513 apply_lease(iface, assign, true);
514 return true;
515 }
516
517 if (c->assigned != 0)
518 current = (c->assigned + (1 << (64 - c->length)));
519 }
520
521 return false;
522 }
523
524
525 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
526 {
527 bool match = false;
528 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
529 if (!iface->ia_addr[i].has_class) {
530 match = true;
531 continue;
532 } else if (assign->classes_cnt) {
533 for (size_t j = 0; j < assign->classes_cnt; ++j)
534 if (assign->classes[j] == iface->ia_addr[i].class)
535 match = true;
536 } else if (assign->all_class) {
537 match = true;
538 }
539 }
540
541 if (!match)
542 return false;
543
544 // Seed RNG with checksum of DUID
545 uint32_t seed = 0;
546 for (size_t i = 0; i < assign->clid_len; ++i)
547 seed += assign->clid_data[i];
548 srand(seed);
549
550 // Try to assign up to 100x
551 for (size_t i = 0; i < 100; ++i) {
552 uint32_t try;
553 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
554
555 struct dhcpv6_assignment *c;
556 list_for_each_entry(c, &iface->ia_assignments, head) {
557 if (c->length == 0)
558 continue;
559
560 if (c->assigned > try || c->length != 128) {
561 assign->assigned = try;
562 list_add_tail(&assign->head, &c->head);
563 return true;
564 } else if (c->assigned == try) {
565 break;
566 }
567 }
568 }
569
570 return false;
571 }
572
573
574 static int prefixcmp(const void *va, const void *vb)
575 {
576 const struct odhcpd_ipaddr *a = va, *b = vb;
577 uint32_t a_pref = ((a->addr.s6_addr[0] & 0xfe) != 0xfc) ? a->preferred : 1;
578 uint32_t b_pref = ((b->addr.s6_addr[0] & 0xfe) != 0xfc) ? b->preferred : 1;
579 return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0;
580 }
581
582
583 static void update(struct interface *iface)
584 {
585 struct odhcpd_ipaddr addr[8];
586 memset(addr, 0, sizeof(addr));
587 int len = odhcpd_get_interface_addresses(iface->ifindex, addr, 8);
588
589 if (len < 0)
590 return;
591
592 qsort(addr, len, sizeof(*addr), prefixcmp);
593
594 time_t now = odhcpd_time();
595 int minprefix = -1;
596
597 for (int i = 0; i < len; ++i) {
598 if (addr[i].preferred > 0 && addr[i].prefix > minprefix)
599 minprefix = addr[i].prefix;
600
601 addr[i].addr.s6_addr32[3] = 0;
602
603 if (addr[i].preferred < UINT32_MAX - now)
604 addr[i].preferred += now;
605
606 if (addr[i].valid < UINT32_MAX - now)
607 addr[i].valid += now;
608 }
609
610 struct dhcpv6_assignment *border = list_last_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
611 border->assigned = 1 << (64 - minprefix);
612
613 bool change = len != (int)iface->ia_addr_len;
614 for (int i = 0; !change && i < len; ++i)
615 if (addr[i].addr.s6_addr32[0] != iface->ia_addr[i].addr.s6_addr32[0] ||
616 addr[i].addr.s6_addr32[1] != iface->ia_addr[i].addr.s6_addr32[1] ||
617 (addr[i].preferred > 0) != (iface->ia_addr[i].preferred > 0) ||
618 (addr[i].valid > (uint32_t)now + 7200) !=
619 (iface->ia_addr[i].valid > (uint32_t)now + 7200))
620 change = true;
621
622 if (change) {
623 struct dhcpv6_assignment *c;
624 list_for_each_entry(c, &iface->ia_assignments, head)
625 if (c != border && !iface->managed)
626 apply_lease(iface, c, false);
627 }
628
629 memcpy(iface->ia_addr, addr, len * sizeof(*addr));
630 iface->ia_addr_len = len;
631
632 if (change) { // Addresses / prefixes have changed
633 struct list_head reassign = LIST_HEAD_INIT(reassign);
634 struct dhcpv6_assignment *c, *d;
635 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
636 if (c->clid_len == 0 || c->valid_until < now || c->managed_size)
637 continue;
638
639 if (c->length < 128 && c->assigned >= border->assigned && c != border)
640 list_move(&c->head, &reassign);
641 else if (c != border)
642 apply_lease(iface, c, true);
643
644 if (c->accept_reconf && c->reconf_cnt == 0) {
645 c->reconf_cnt = 1;
646 c->reconf_sent = now;
647 send_reconf(iface, c);
648
649 // Leave all other assignments of that client alone
650 struct dhcpv6_assignment *a;
651 list_for_each_entry(a, &iface->ia_assignments, head)
652 if (a != c && a->clid_len == c->clid_len &&
653 !memcmp(a->clid_data, c->clid_data, a->clid_len))
654 c->reconf_cnt = INT_MAX;
655 }
656 }
657
658 while (!list_empty(&reassign)) {
659 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
660 list_del(&c->head);
661 if (!assign_pd(iface, c)) {
662 c->assigned = 0;
663 list_add(&c->head, &iface->ia_assignments);
664 }
665 }
666
667 dhcpv6_write_statefile();
668 }
669 }
670
671
672 static void reconf_timer(struct uloop_timeout *event)
673 {
674 time_t now = odhcpd_time();
675 struct interface *iface;
676 list_for_each_entry(iface, &interfaces, head) {
677 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
678 continue;
679
680 struct dhcpv6_assignment *a, *n;
681 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
682 if (a->valid_until < now) {
683 if ((a->length < 128 && a->clid_len > 0) ||
684 (a->length == 128 && a->clid_len == 0)) {
685 list_del(&a->head);
686 free_dhcpv6_assignment(a);
687 }
688 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
689 now > a->reconf_sent + (1 << a->reconf_cnt)) {
690 ++a->reconf_cnt;
691 a->reconf_sent = now;
692 send_reconf(iface, a);
693 }
694 }
695 }
696 uloop_timeout_set(event, 2000);
697 }
698
699
700 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
701 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
702 struct interface *iface, bool request)
703 {
704 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
705 return 0;
706
707 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
708 size_t datalen = sizeof(out);
709 time_t now = odhcpd_time();
710
711 if (status) {
712 struct __attribute__((packed)) {
713 uint16_t type;
714 uint16_t len;
715 uint16_t value;
716 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
717 htons(status)};
718
719 memcpy(buf + datalen, &stat, sizeof(stat));
720 datalen += sizeof(stat);
721 } else {
722 if (a) {
723 uint32_t leasetime = iface->dhcpv4_leasetime;
724 if (leasetime == 0)
725 leasetime = 3600;
726 else if (leasetime < 60)
727 leasetime = 60;
728
729 uint32_t pref = leasetime;
730 uint32_t valid = leasetime;
731
732 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
733 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
734
735 for (size_t i = 0; i < addrlen; ++i) {
736 bool match = true;
737 if (addrs[i].has_class) {
738 match = false;
739 if (a->classes_cnt) {
740 for (size_t j = 0; j < a->classes_cnt; ++j)
741 if (a->classes[j] == addrs[i].class)
742 match = true;
743 } else if (a->all_class) {
744 match = true;
745 }
746 }
747
748 if (!match)
749 continue;
750
751 uint32_t prefix_pref = addrs[i].preferred - now;
752 uint32_t prefix_valid = addrs[i].valid - now;
753
754 if (addrs[i].prefix > 96 ||
755 addrs[i].preferred <= (uint32_t)now)
756 continue;
757
758 if (prefix_pref > 86400)
759 prefix_pref = 86400;
760
761 if (prefix_valid > 86400)
762 prefix_valid = 86400;
763
764 #ifdef DHCPV6_OPT_PREFIX_CLASS
765 struct {
766 uint16_t code;
767 uint16_t length;
768 uint16_t class;
769 } pclass = {htons(DHCPV6_OPT_PREFIX_CLASS),
770 htons(2), htons(iface->ia_addr[i].class)};
771 #endif
772
773 if (a->length < 128) {
774 struct dhcpv6_ia_prefix p = {
775 .type = htons(DHCPV6_OPT_IA_PREFIX),
776 .len = htons(sizeof(p) - 4),
777 .preferred = htonl(prefix_pref),
778 .valid = htonl(prefix_valid),
779 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
780 .addr = addrs[i].addr
781 };
782 p.addr.s6_addr32[1] |= htonl(a->assigned);
783
784 size_t entrlen = sizeof(p) - 4;
785
786 #ifdef DHCPV6_OPT_PREFIX_CLASS
787 if (iface->ia_addr[i].has_class) {
788 entrlen += sizeof(pclass);
789 p.len = htons(entrlen);
790 }
791 #endif
792
793 if (datalen + entrlen + 4 > buflen ||
794 (a->assigned == 0 && a->managed_size == 0))
795 continue;
796
797 memcpy(buf + datalen, &p, sizeof(p));
798 #ifdef DHCPV6_OPT_PREFIX_CLASS
799 memcpy(buf + datalen + sizeof(p), &pclass, sizeof(pclass));
800 #endif
801 datalen += entrlen + 4;
802 } else {
803 if (!a->accept_reconf && iface->managed < RELAYD_MANAGED_NO_AFLAG)
804 prefix_pref = 1;
805
806 struct dhcpv6_ia_addr n = {
807 .type = htons(DHCPV6_OPT_IA_ADDR),
808 .len = htons(sizeof(n) - 4),
809 .addr = addrs[i].addr,
810 .preferred = htonl(prefix_pref),
811 .valid = htonl(prefix_valid)
812 };
813 n.addr.s6_addr32[3] = htonl(a->assigned);
814 size_t entrlen = sizeof(n) - 4;
815
816 #ifdef DHCPV6_OPT_PREFIX_CLASS
817 if (iface->ia_addr[i].has_class) {
818 entrlen += sizeof(pclass);
819 n.len = htons(entrlen);
820 }
821 #endif
822
823 if (datalen + entrlen + 4 > buflen || a->assigned == 0)
824 continue;
825
826 memcpy(buf + datalen, &n, sizeof(n));
827 #ifdef DHCPV6_OPT_PREFIX_CLASS
828 memcpy(buf + datalen + sizeof(n), &pclass, sizeof(pclass));
829 #endif
830 datalen += entrlen + 4;
831 }
832
833 // Calculate T1 / T2 based on non-deprecated addresses
834 if (prefix_pref > 0) {
835 if (prefix_pref < pref)
836 pref = prefix_pref;
837
838 if (prefix_valid < valid)
839 valid = prefix_valid;
840 }
841 }
842
843 a->valid_until = valid + now;
844 out.t1 = htonl(pref * 5 / 10);
845 out.t2 = htonl(pref * 8 / 10);
846
847 if (!out.t1)
848 out.t1 = htonl(1);
849
850 if (!out.t2)
851 out.t2 = htonl(1);
852 }
853
854 if (!request) {
855 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
856 uint16_t otype, olen;
857 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
858 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
859 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
860 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
861 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
862 continue;
863
864 bool found = false;
865 if (a) {
866 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
867 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
868
869 for (size_t i = 0; i < addrlen; ++i) {
870 if (addrs[i].prefix > 96 ||
871 addrs[i].preferred <= (uint32_t)now)
872 continue;
873
874 struct in6_addr addr = addrs[i].addr;
875 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
876 addr.s6_addr32[1] |= htonl(a->assigned);
877
878 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
879 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
880 found = true;
881 } else {
882 addr.s6_addr32[3] = htonl(a->assigned);
883
884 if (!memcmp(&n->addr, &addr, sizeof(addr)))
885 found = true;
886 }
887 }
888 }
889
890 if (!found) {
891 if (otype == DHCPV6_OPT_IA_PREFIX) {
892 struct dhcpv6_ia_prefix inv = {
893 .type = htons(DHCPV6_OPT_IA_PREFIX),
894 .len = htons(sizeof(inv) - 4),
895 .preferred = 0,
896 .valid = 0,
897 .prefix = p->prefix,
898 .addr = p->addr
899 };
900
901 if (datalen + sizeof(inv) > buflen)
902 continue;
903
904 memcpy(buf + datalen, &inv, sizeof(inv));
905 datalen += sizeof(inv);
906 } else {
907 struct dhcpv6_ia_addr inv = {
908 .type = htons(DHCPV6_OPT_IA_ADDR),
909 .len = htons(sizeof(inv) - 4),
910 .addr = n->addr,
911 .preferred = 0,
912 .valid = 0
913 };
914
915 if (datalen + sizeof(inv) > buflen)
916 continue;
917
918 memcpy(buf + datalen, &inv, sizeof(inv));
919 datalen += sizeof(inv);
920 }
921 }
922 }
923 }
924 }
925
926 out.len = htons(datalen - 4);
927 memcpy(buf, &out, sizeof(out));
928 return datalen;
929 }
930
931
932 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
933 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
934 {
935 const char *type = "UNKNOWN";
936 const char *status = "UNKNOWN";
937
938 if (msgtype == DHCPV6_MSG_RENEW)
939 return;
940
941 switch (msgtype) {
942 case DHCPV6_MSG_SOLICIT:
943 type = "SOLICIT";
944 break;
945 case DHCPV6_MSG_REQUEST:
946 type = "REQUEST";
947 break;
948 case DHCPV6_MSG_CONFIRM:
949 type = "CONFIRM";
950 break;
951 case DHCPV6_MSG_RENEW:
952 type = "RENEW";
953 break;
954 case DHCPV6_MSG_REBIND:
955 type = "REBIND";
956 break;
957 case DHCPV6_MSG_RELEASE:
958 type = "RELEASE";
959 break;
960 case DHCPV6_MSG_DECLINE:
961 type = "DECLINE";
962 break;
963 }
964
965 switch (code) {
966 case DHCPV6_STATUS_OK:
967 status = "ok";
968 break;
969 case DHCPV6_STATUS_NOADDRSAVAIL:
970 status = "no addresses available";
971 break;
972 case DHCPV6_STATUS_NOBINDING:
973 status = "no binding";
974 break;
975 case DHCPV6_STATUS_NOTONLINK:
976 status = "not on-link";
977 break;
978 case DHCPV6_STATUS_NOPREFIXAVAIL:
979 status = "no prefix available";
980 break;
981 }
982
983 char leasebuf[256] = "";
984
985 if (a) {
986 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
987 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
988 size_t lbsize = 0;
989 char addrbuf[INET6_ADDRSTRLEN];
990
991 for (size_t i = 0; i < addrlen; ++i) {
992 if (addrs[i].prefix > 96 || addrs[i].preferred <= (uint32_t)now)
993 continue;
994
995 struct in6_addr addr = addrs[i].addr;
996 int prefix = a->managed ? addrs[i].prefix : a->length;
997 if (prefix == 128)
998 addr.s6_addr32[3] = htonl(a->assigned);
999 else
1000 addr.s6_addr32[1] |= htonl(a->assigned);
1001
1002 inet_ntop(AF_INET6, &addr, addrbuf, sizeof(addrbuf));
1003 lbsize += snprintf(leasebuf + lbsize, sizeof(leasebuf) - lbsize, "%s/%d ", addrbuf, prefix);
1004 }
1005 }
1006
1007 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1008 duidbuf, iface->ifname, status, leasebuf);
1009 }
1010
1011
1012
1013 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
1014 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1015 {
1016 time_t now = odhcpd_time();
1017 size_t response_len = 0;
1018 const struct dhcpv6_client_header *hdr = data;
1019 uint8_t *start = (uint8_t*)&hdr[1], *odata;
1020 uint16_t otype, olen;
1021
1022 // Find and parse client-id and hostname
1023 bool accept_reconf = false;
1024 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1025 char hostname[256];
1026 size_t hostname_len = 0;
1027 bool class_oro = false;
1028 bool notonlink = false;
1029 char duidbuf[261];
1030
1031 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1032 if (otype == DHCPV6_OPT_CLIENTID) {
1033 clid_data = odata;
1034 clid_len = olen;
1035
1036 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1037 memcpy(mac, &odata[8], sizeof(mac));
1038 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1039 memcpy(mac, &odata[4], sizeof(mac));
1040
1041 if (olen <= 130)
1042 odhcpd_hexlify(duidbuf, odata, olen);
1043 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1044 uint8_t fqdn_buf[256];
1045 memcpy(fqdn_buf, odata, olen);
1046 fqdn_buf[olen++] = 0;
1047
1048 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1049 hostname_len = strcspn(hostname, ".");
1050 } else if (otype == DHCPV6_OPT_ORO) {
1051 #ifdef DHCPV6_OPT_PREFIX_CLASS
1052 for (size_t i = 0; i + 1 < olen; i += 2) {
1053 if (odata[i] == (DHCPV6_OPT_PREFIX_CLASS >> 8) &&
1054 odata[i + 1] == (DHCPV6_OPT_PREFIX_CLASS & 0xff))
1055 class_oro = true;
1056 }
1057 #endif
1058 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
1059 accept_reconf = true;
1060 }
1061 }
1062
1063 if (!clid_data || !clid_len || clid_len > 130)
1064 goto out;
1065
1066 update(iface);
1067
1068 struct dhcpv6_assignment *first = NULL;
1069 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1070 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1071 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1072 bool ia_addr_present = false;
1073 if (!is_pd && !is_na)
1074 continue;
1075
1076 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1077 size_t ia_response_len = 0;
1078 uint8_t reqlen = (is_pd) ? 62 : 128;
1079 uint32_t reqhint = 0;
1080
1081 const uint8_t classes_max = 32;
1082 uint8_t classes_cnt = 0;
1083 uint16_t classes[classes_max];
1084
1085 // Parse request hint for IA-PD
1086 if (is_pd) {
1087 uint8_t *sdata;
1088 uint16_t stype, slen;
1089 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1090 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1091 continue;
1092
1093 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1094 if (p->prefix) {
1095 reqlen = p->prefix;
1096 reqhint = ntohl(p->addr.s6_addr32[1]);
1097 if (reqlen > 32 && reqlen <= 64)
1098 reqhint &= (1U << (64 - reqlen)) - 1;
1099 }
1100
1101 #ifdef DHCPV6_OPT_PREFIX_CLASS
1102 uint8_t *xdata;
1103 uint16_t xtype, xlen;
1104 dhcpv6_for_each_option(&p[1], sdata + slen, xtype, xlen, xdata) {
1105 if (xtype != DHCPV6_OPT_PREFIX_CLASS || xlen != 2)
1106 continue;
1107
1108 if (classes_cnt >= classes_max)
1109 continue;
1110
1111 classes[classes_cnt++] = (uint16_t)xdata[0] << 8 | (uint16_t)xdata[1];
1112 }
1113 #endif
1114 }
1115
1116 if (reqlen > 64)
1117 reqlen = 64;
1118 } else if (is_na) {
1119 uint8_t *sdata;
1120 uint16_t stype, slen;
1121 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1122 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1123 continue;
1124
1125 ia_addr_present = true;
1126 #ifdef DHCPV6_OPT_PREFIX_CLASS
1127 uint8_t *xdata;
1128 uint16_t xtype, xlen;
1129 struct dhcpv6_ia_addr *p = (struct dhcpv6_ia_addr*)&sdata[-4];
1130 dhcpv6_for_each_option(&p[1], sdata + slen, xtype, xlen, xdata) {
1131 if (xtype != DHCPV6_OPT_PREFIX_CLASS || xlen != 2)
1132 continue;
1133
1134 if (classes_cnt >= classes_max)
1135 continue;
1136
1137 classes[classes_cnt++] = (uint16_t)xdata[0] << 8 | (uint16_t)xdata[1];
1138 }
1139 #endif
1140 }
1141 }
1142
1143 // Find assignment
1144 struct dhcpv6_assignment *c, *a = NULL;
1145 list_for_each_entry(c, &iface->ia_assignments, head) {
1146 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1147 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1148 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1149 (c->iaid == ia->iaid || c->valid_until < now) &&
1150 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1151 a = c;
1152
1153 // Reset state
1154 apply_lease(iface, a, false);
1155 memcpy(a->clid_data, clid_data, clid_len);
1156 a->clid_len = clid_len;
1157 a->iaid = ia->iaid;
1158 a->peer = *addr;
1159 a->reconf_cnt = 0;
1160 a->reconf_sent = 0;
1161 a->all_class = class_oro;
1162 a->classes_cnt = classes_cnt;
1163 a->classes = realloc(a->classes, classes_cnt * sizeof(uint16_t));
1164 if (a->classes)
1165 memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
1166 break;
1167 }
1168 }
1169
1170 // Generic message handling
1171 uint16_t status = DHCPV6_STATUS_OK;
1172 if (a && a->managed_size < 0) {
1173 return -1;
1174 } else if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) {
1175 bool assigned = !!a;
1176
1177 if (!a && !iface->no_dynamic_dhcp) { // Create new binding
1178 a = calloc(1, sizeof(*a) + clid_len);
1179 if (a) {
1180 a->clid_len = clid_len;
1181 a->iaid = ia->iaid;
1182 a->length = reqlen;
1183 a->peer = *addr;
1184 a->assigned = reqhint;
1185 a->all_class = class_oro;
1186 a->classes_cnt = classes_cnt;
1187 if (classes_cnt) {
1188 a->classes = malloc(classes_cnt * sizeof(uint16_t));
1189 if (a->classes)
1190 memcpy(a->classes, classes, classes_cnt * sizeof(uint16_t));
1191 }
1192
1193 if (first)
1194 memcpy(a->key, first->key, sizeof(a->key));
1195 else
1196 odhcpd_urandom(a->key, sizeof(a->key));
1197 memcpy(a->clid_data, clid_data, clid_len);
1198
1199 if (is_pd)
1200 while (!(assigned = assign_pd(iface, a)) &&
1201 !a->managed_size && ++a->length <= 64);
1202 else
1203 assigned = assign_na(iface, a);
1204
1205 if (a->managed_size && !assigned)
1206 return -1;
1207 }
1208 }
1209
1210 if (!assigned || iface->ia_addr_len == 0) { // Set error status
1211 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1212 } else if (assigned && !first) { //
1213 size_t handshake_len = 4;
1214 buf[0] = 0;
1215 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1216 buf[2] = 0;
1217 buf[3] = 0;
1218
1219 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1220 struct dhcpv6_auth_reconfigure auth = {
1221 htons(DHCPV6_OPT_AUTH),
1222 htons(sizeof(auth) - 4),
1223 3, 1, 0,
1224 {htonl(time(NULL)), htonl(++serial)},
1225 1,
1226 {0}
1227 };
1228 memcpy(auth.key, a->key, sizeof(a->key));
1229 memcpy(buf + handshake_len, &auth, sizeof(auth));
1230 handshake_len += sizeof(auth);
1231 }
1232
1233 buf += handshake_len;
1234 buflen -= handshake_len;
1235 response_len += handshake_len;
1236
1237 first = a;
1238 }
1239
1240 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1241
1242 // Was only a solicitation: mark binding for removal
1243 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1244 a->valid_until = 0;
1245 } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) {
1246 if (hostname_len > 0) {
1247 a->hostname = realloc(a->hostname, hostname_len + 1);
1248 if (a->hostname) {
1249 memcpy(a->hostname, hostname, hostname_len);
1250 a->hostname[hostname_len] = 0;
1251 }
1252 }
1253 a->accept_reconf = accept_reconf;
1254 apply_lease(iface, a, true);
1255 } else if (!assigned && a && a->managed_size == 0) { // Cleanup failed assignment
1256 free_dhcpv6_assignment(a);
1257 }
1258 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1259 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1260 hdr->msg_type == DHCPV6_MSG_REBIND ||
1261 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1262 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1263 status = DHCPV6_STATUS_NOBINDING;
1264 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1265 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1266 hdr->msg_type == DHCPV6_MSG_REBIND) {
1267 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1268 if (a)
1269 apply_lease(iface, a, true);
1270 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1271 a->valid_until = 0;
1272 apply_lease(iface, a, false);
1273 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1274 a->clid_len = 0;
1275 a->valid_until = now + 3600; // Block address for 1h
1276 }
1277 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1278 // Send NOTONLINK for CONFIRM with addr present so that clients restart connection
1279 status = DHCPV6_STATUS_NOTONLINK;
1280 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1281 notonlink = true;
1282 }
1283
1284 buf += ia_response_len;
1285 buflen -= ia_response_len;
1286 response_len += ia_response_len;
1287 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1288 }
1289
1290 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1291 response_len + 6 < buflen) {
1292 buf[0] = 0;
1293 buf[1] = DHCPV6_OPT_STATUS;
1294 buf[2] = 0;
1295 buf[3] = 2;
1296 buf[4] = 0;
1297 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1298 response_len += 6;
1299 }
1300
1301 dhcpv6_write_statefile();
1302
1303 out:
1304 return response_len;
1305 }
OpenWrt DHCP Server