projects / project / odhcpd.git / blob
? search:


847ede4329c62211fb90b8f25510e0da622d4b9b
[project/odhcpd.git] / src / dhcpv6-ia.c
1 /**
2 * Copyright (C) 2013 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2016 Hans Dedecker <dedeckeh@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #include "odhcpd.h"
17 #include "dhcpv6.h"
18 #include "dhcpv4.h"
19
20 #include <time.h>
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <stdio.h>
24 #include <poll.h>
25 #include <alloca.h>
26 #include <resolv.h>
27 #include <limits.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <stdbool.h>
32 #include <arpa/inet.h>
33 #include <sys/timerfd.h>
34
35 #include <libubox/md5.h>
36 #include <libubox/usock.h>
37
38 #define ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) \
39 ((iface)->dhcpv6_assignall || (i) == (m) || \
40 (addrs)[(i)].prefix > 64)
41
42 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c);
43 static void reconf_timer(struct uloop_timeout *event);
44 static struct uloop_timeout reconf_event = {.cb = reconf_timer};
45 static uint32_t serial = 0;
46 static uint8_t statemd5[16];
47
48 int dhcpv6_ia_init(void)
49 {
50 uloop_timeout_set(&reconf_event, 2000);
51 return 0;
52 }
53
54 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
55 {
56 if (!enable && iface->ia_assignments.next) {
57 struct dhcpv6_assignment *c;
58
59 while (!list_empty(&iface->ia_assignments)) {
60 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
61 free_dhcpv6_assignment(c);
62 }
63 }
64
65 if (enable && iface->dhcpv6 == RELAYD_SERVER) {
66 if (!iface->ia_assignments.next)
67 INIT_LIST_HEAD(&iface->ia_assignments);
68
69 if (list_empty(&iface->ia_assignments)) {
70 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
71 if (!border) {
72 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
73 return -1;
74 }
75
76 border->length = 64;
77 list_add(&border->head, &iface->ia_assignments);
78 }
79
80 /* Parse static entries */
81 struct lease *lease;
82 list_for_each_entry(lease, &leases, head) {
83 /* Construct entry */
84 size_t duid_len = lease->duid_len ? lease->duid_len : 14;
85 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + duid_len);
86 if (!a) {
87 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
88 iface->ifname);
89 return -1;
90 }
91
92 a->leasetime = lease->dhcpv4_leasetime;
93
94 a->clid_len = duid_len;
95 a->length = 128;
96 if (lease->hostid) {
97 a->assigned = lease->hostid;
98 } else {
99 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
100 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
101 }
102
103 odhcpd_urandom(a->key, sizeof(a->key));
104 memcpy(a->clid_data, lease->duid, lease->duid_len);
105 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
106 /* Static assignment */
107 a->flags |= OAF_STATIC;
108 /* Infinite valid */
109 a->valid_until = 0;
110
111 /* Assign to all interfaces */
112 struct dhcpv6_assignment *c;
113 list_for_each_entry(c, &iface->ia_assignments, head) {
114 if (c->length != 128 || c->assigned > a->assigned) {
115 list_add_tail(&a->head, &c->head);
116 break;
117 } else if (c->assigned == a->assigned)
118 /* Already an assignment with that number */
119 break;
120 }
121
122 if (a->head.next) {
123 if (lease->hostname[0]) {
124 free(a->hostname);
125 a->hostname = strdup(lease->hostname);
126 }
127 } else
128 free_dhcpv6_assignment(a);
129 }
130 }
131 return 0;
132 }
133
134 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c)
135 {
136 if (c->managed_sock.fd.registered) {
137 ustream_free(&c->managed_sock.stream);
138 close(c->managed_sock.fd.fd);
139 }
140
141 if (c->head.next)
142 list_del(&c->head);
143
144 free(c->managed);
145 free(c->hostname);
146 free(c);
147 }
148
149 static inline bool valid_prefix_length(const struct dhcpv6_assignment *a, const uint8_t prefix_length)
150 {
151 return (a->managed_size || a->length > prefix_length);
152 }
153
154 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
155 {
156 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
157 }
158
159 static size_t get_preferred_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
160 {
161 size_t i, m;
162
163 for (i = 0, m = 0; i < addrlen; ++i) {
164 if (addrs[i].preferred > addrs[m].preferred ||
165 (addrs[i].preferred == addrs[m].preferred &&
166 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
167 m = i;
168 }
169
170 return m;
171 }
172
173 static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign)
174 {
175 struct {
176 struct dhcpv6_client_header hdr;
177 uint16_t srvid_type;
178 uint16_t srvid_len;
179 uint16_t duid_type;
180 uint16_t hardware_type;
181 uint8_t mac[6];
182 uint16_t msg_type;
183 uint16_t msg_len;
184 uint8_t msg_id;
185 struct dhcpv6_auth_reconfigure auth;
186 uint16_t clid_type;
187 uint16_t clid_len;
188 uint8_t clid_data[128];
189 } __attribute__((packed)) reconf_msg = {
190 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
191 .srvid_type = htons(DHCPV6_OPT_SERVERID),
192 .srvid_len = htons(10),
193 .duid_type = htons(3),
194 .hardware_type = htons(1),
195 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
196 .msg_len = htons(1),
197 .msg_id = DHCPV6_MSG_RENEW,
198 .auth = {htons(DHCPV6_OPT_AUTH),
199 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
200 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
201 .clid_type = htons(DHCPV6_OPT_CLIENTID),
202 .clid_len = htons(assign->clid_len),
203 .clid_data = {0},
204 };
205
206 odhcpd_get_mac(iface, reconf_msg.mac);
207 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
208 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
209
210 md5_ctx_t md5;
211 uint8_t secretbytes[64];
212 memset(secretbytes, 0, sizeof(secretbytes));
213 memcpy(secretbytes, assign->key, sizeof(assign->key));
214
215 for (size_t i = 0; i < sizeof(secretbytes); ++i)
216 secretbytes[i] ^= 0x36;
217
218 md5_begin(&md5);
219 md5_hash(secretbytes, sizeof(secretbytes), &md5);
220 md5_hash(iov.iov_base, iov.iov_len, &md5);
221 md5_end(reconf_msg.auth.key, &md5);
222
223 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
224 secretbytes[i] ^= 0x36;
225 secretbytes[i] ^= 0x5c;
226 }
227
228 md5_begin(&md5);
229 md5_hash(secretbytes, sizeof(secretbytes), &md5);
230 md5_hash(reconf_msg.auth.key, 16, &md5);
231 md5_end(reconf_msg.auth.key, &md5);
232
233 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
234 }
235
236 void dhcpv6_enum_ia_addrs(struct interface *iface, struct dhcpv6_assignment *c,
237 time_t now, dhcpv6_binding_cb_handler_t func, void *arg)
238 {
239 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr;
240 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len;
241 size_t m = get_preferred_addr(addrs, addrlen);
242
243 for (size_t i = 0; i < addrlen; ++i) {
244 struct in6_addr addr;
245 uint32_t pref, valid;
246 int prefix = c->managed ? addrs[i].prefix : c->length;
247
248 if (!valid_addr(&addrs[i], now))
249 continue;
250
251 addr = addrs[i].addr.in6;
252 pref = addrs[i].preferred;
253 valid = addrs[i].valid;
254 if (prefix == 128) {
255 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs))
256 continue;
257
258 addr.s6_addr32[3] = htonl(c->assigned);
259 } else {
260 if (!valid_prefix_length(c, addrs[i].prefix))
261 continue;
262
263 addr.s6_addr32[1] |= htonl(c->assigned);
264 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
265 }
266
267 if (pref != UINT32_MAX)
268 pref -= now;
269
270 if (valid != UINT32_MAX)
271 valid -= now;
272
273 func(&addr, prefix, pref, valid, arg);
274 }
275 }
276
277 struct write_ctxt {
278 FILE *fp;
279 md5_ctx_t md5;
280 struct dhcpv6_assignment *c;
281 struct interface *iface;
282 char *buf;
283 int buf_len;
284 int buf_idx;
285 };
286
287 void dhcpv6_write_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
288 _unused uint32_t valid, void *arg)
289 {
290 struct write_ctxt *ctxt = (struct write_ctxt *)arg;
291 char ipbuf[INET6_ADDRSTRLEN];
292
293 inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf) - 1);
294
295 if (ctxt->c->length == 128 && ctxt->c->hostname) {
296 fputs(ipbuf, ctxt->fp);
297
298 char b[256];
299 if (dn_expand(ctxt->iface->search, ctxt->iface->search + ctxt->iface->search_len,
300 ctxt->iface->search, b, sizeof(b)) > 0)
301 fprintf(ctxt->fp, "\t%s.%s", ctxt->c->hostname, b);
302
303 fprintf(ctxt->fp, "\t%s\n", ctxt->c->hostname);
304 md5_hash(ipbuf, strlen(ipbuf), &ctxt->md5);
305 md5_hash(ctxt->c->hostname, strlen(ctxt->c->hostname), &ctxt->md5);
306 }
307
308 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx,ctxt->buf_len - ctxt->buf_idx,
309 "%s/%d ", ipbuf, prefix);
310 }
311
312 void dhcpv6_write_statefile(void)
313 {
314 struct write_ctxt ctxt;
315
316 md5_begin(&ctxt.md5);
317
318 if (config.dhcp_statefile) {
319 time_t now = odhcpd_time(), wall_time = time(NULL);
320 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
321 char leasebuf[512];
322
323 if (fd < 0)
324 return;
325 int ret;
326 ret = lockf(fd, F_LOCK, 0);
327 if (ret < 0) {
328 close(fd);
329 return;
330 }
331 if (ftruncate(fd, 0) < 0) {}
332
333 ctxt.fp = fdopen(fd, "w");
334 if (!ctxt.fp) {
335 close(fd);
336 return;
337 }
338
339 ctxt.buf = leasebuf;
340 ctxt.buf_len = sizeof(leasebuf);
341
342 list_for_each_entry(ctxt.iface, &interfaces, head) {
343 if (ctxt.iface->dhcpv6 != RELAYD_SERVER &&
344 ctxt.iface->dhcpv4 != RELAYD_SERVER)
345 continue;
346
347 if (ctxt.iface->dhcpv6 == RELAYD_SERVER &&
348 ctxt.iface->ia_assignments.next) {
349 list_for_each_entry(ctxt.c, &ctxt.iface->ia_assignments, head) {
350 if (!(ctxt.c->flags & OAF_BOUND) || ctxt.c->managed_size < 0)
351 continue;
352
353 char duidbuf[264];
354
355 odhcpd_hexlify(duidbuf, ctxt.c->clid_data, ctxt.c->clid_len);
356
357 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
358 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s %x %s %ld %x %u ",
359 ctxt.iface->ifname, duidbuf, ntohl(ctxt.c->iaid),
360 (ctxt.c->hostname ? ctxt.c->hostname : "-"),
361 (ctxt.c->valid_until > now ?
362 (ctxt.c->valid_until - now + wall_time) :
363 (INFINITE_VALID(ctxt.c->valid_until) ? -1 : 0)),
364 ctxt.c->assigned, (unsigned)ctxt.c->length);
365
366 if (INFINITE_VALID(ctxt.c->valid_until) || ctxt.c->valid_until > now)
367 dhcpv6_enum_ia_addrs(ctxt.iface, ctxt.c, now,
368 dhcpv6_write_ia_addr, &ctxt);
369
370 ctxt.buf[ctxt.buf_idx - 1] = '\n';
371 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
372 }
373 }
374
375 if (ctxt.iface->dhcpv4 == RELAYD_SERVER &&
376 ctxt.iface->dhcpv4_assignments.next) {
377 struct dhcpv4_assignment *c;
378 list_for_each_entry(c, &ctxt.iface->dhcpv4_assignments, head) {
379 if (!(c->flags & OAF_BOUND))
380 continue;
381
382 char ipbuf[INET6_ADDRSTRLEN];
383 char duidbuf[16];
384 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
385
386 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
387 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s ipv4 %s %ld %x 32 ",
388 ctxt.iface->ifname, duidbuf,
389 (c->hostname ? c->hostname : "-"),
390 (c->valid_until > now ?
391 (c->valid_until - now + wall_time) :
392 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
393 c->addr);
394
395 struct in_addr addr = {htonl(c->addr)};
396 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
397
398 if (c->hostname) {
399 fputs(ipbuf, ctxt.fp);
400
401 char b[256];
402 if (dn_expand(ctxt.iface->search,
403 ctxt.iface->search + ctxt.iface->search_len,
404 ctxt.iface->search, b, sizeof(b)) > 0)
405 fprintf(ctxt.fp, "\t%s.%s", c->hostname, b);
406
407 fprintf(ctxt.fp, "\t%s\n", c->hostname);
408 md5_hash(ipbuf, strlen(ipbuf), &ctxt.md5);
409 md5_hash(c->hostname, strlen(c->hostname), &ctxt.md5);
410 }
411
412 ctxt.buf_idx += snprintf(ctxt.buf + ctxt.buf_idx,
413 ctxt.buf_len - ctxt.buf_idx,
414 "%s/32 ", ipbuf);
415 ctxt.buf[ctxt.buf_idx - 1] = '\n';
416 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
417 }
418 }
419 }
420
421 fclose(ctxt.fp);
422 }
423
424 uint8_t newmd5[16];
425 md5_end(newmd5, &ctxt.md5);
426
427 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
428 memcpy(statemd5, newmd5, sizeof(statemd5));
429 char *argv[2] = {config.dhcp_cb, NULL};
430 if (!vfork()) {
431 execv(argv[0], argv);
432 _exit(128);
433 }
434 }
435 }
436
437
438 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
439 {
440 if (a->length > 64 || a->managed_size < 0)
441 return;
442
443 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
444 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
445
446 for (size_t i = 0; i < addrlen; ++i) {
447 struct in6_addr prefix = addrs[i].addr.in6;
448 prefix.s6_addr32[1] |= htonl(a->assigned);
449 prefix.s6_addr32[2] = prefix.s6_addr32[3] = 0;
450 odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
451 iface, &a->peer.sin6_addr, 1024, add);
452 }
453 }
454
455 /* More data was received from TCP connection */
456 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
457 {
458 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
459 time_t now = odhcpd_time();
460 bool first = c->managed_size < 0;
461
462 for (;;) {
463 int pending;
464 char *data = ustream_get_read_buf(s, &pending);
465 char *end = memmem(data, pending, "\n\n", 2);
466
467 if (!end)
468 break;
469
470 end += 2;
471 end[-1] = 0;
472
473 c->managed_size = 0;
474 if (c->accept_reconf)
475 c->reconf_cnt = 1;
476
477 char *saveptr;
478 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
479 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
480 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
481
482 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
483 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
484 continue;
485
486 x = strtok_r(NULL, ",", &saveptr2);
487 if (sscanf(x, "%hhu", &n->prefix) < 1)
488 continue;
489
490 x = strtok_r(NULL, ",", &saveptr2);
491 if (sscanf(x, "%u", &n->preferred) < 1)
492 continue;
493
494 x = strtok_r(NULL, ",", &saveptr2);
495 if (sscanf(x, "%u", &n->valid) < 1)
496 continue;
497
498 if (n->preferred > n->valid)
499 continue;
500
501 if (UINT32_MAX - now < n->preferred)
502 n->preferred = UINT32_MAX;
503 else
504 n->preferred += now;
505
506 if (UINT32_MAX - now < n->valid)
507 n->valid = UINT32_MAX;
508 else
509 n->valid += now;
510
511 n->dprefix = 0;
512
513 ++c->managed_size;
514 }
515
516 ustream_consume(s, end - data);
517 }
518
519 if (first && c->managed_size == 0)
520 free_dhcpv6_assignment(c);
521 else if (first && !(c->flags & OAF_STATIC))
522 c->valid_until = now + 150;
523 }
524
525
526 /* TCP transmission has ended, either because of success or timeout or other error */
527 static void managed_handle_pd_done(struct ustream *s)
528 {
529 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
530
531 if (!(c->flags & OAF_STATIC))
532 c->valid_until = odhcpd_time() + 15;
533
534 c->managed_size = 0;
535
536 if (c->accept_reconf)
537 c->reconf_cnt = 1;
538 }
539
540 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
541 {
542 struct dhcpv6_assignment *c;
543
544 if (iface->dhcpv6_pd_manager[0]) {
545 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
546 if (fd >= 0) {
547 char iaidbuf[298];
548 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
549
550 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
551 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
552 ustream_fd_init(&assign->managed_sock, fd);
553 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
554 iaidbuf, assign->iaid, assign->length);
555 ustream_write_pending(&assign->managed_sock.stream);
556 assign->managed_size = -1;
557
558 if (!(assign->flags & OAF_STATIC))
559 assign->valid_until = odhcpd_time() + 15;
560
561 list_add(&assign->head, &iface->ia_assignments);
562
563 /* Wait initial period of up to 250ms for immediate assignment */
564 struct pollfd pfd = { .fd = fd, .events = POLLIN };
565 poll(&pfd, 1, 250);
566 managed_handle_pd_data(&assign->managed_sock.stream, 0);
567
568 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
569 return true;
570 }
571
572 return false;
573 } else if (iface->ia_addr_len < 1)
574 return false;
575
576 /* Try honoring the hint first */
577 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
578 if (assign->assigned) {
579 list_for_each_entry(c, &iface->ia_assignments, head) {
580 if (c->length == 128 || c->length == 0)
581 continue;
582
583 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
584 list_add_tail(&assign->head, &c->head);
585
586 if (assign->flags & OAF_BOUND)
587 apply_lease(iface, assign, true);
588
589 return true;
590 }
591
592 if (c->assigned != 0)
593 current = (c->assigned + (1 << (64 - c->length)));
594 }
595 }
596
597 /* Fallback to a variable assignment */
598 current = 1;
599 list_for_each_entry(c, &iface->ia_assignments, head) {
600 if (c->length == 128 || c->length == 0)
601 continue;
602
603 current = (current + asize) & (~asize);
604 if (current + asize < c->assigned) {
605 assign->assigned = current;
606 list_add_tail(&assign->head, &c->head);
607
608 if (assign->flags & OAF_BOUND)
609 apply_lease(iface, assign, true);
610
611 return true;
612 }
613
614 if (c->assigned != 0)
615 current = (c->assigned + (1 << (64 - c->length)));
616 }
617
618 return false;
619 }
620
621 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
622 {
623 /* Seed RNG with checksum of DUID */
624 uint32_t seed = 0;
625 for (size_t i = 0; i < assign->clid_len; ++i)
626 seed += assign->clid_data[i];
627 srand(seed);
628
629 /* Try to assign up to 100x */
630 for (size_t i = 0; i < 100; ++i) {
631 uint32_t try;
632 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
633
634 struct dhcpv6_assignment *c;
635 list_for_each_entry(c, &iface->ia_assignments, head) {
636 if (c->length == 0)
637 continue;
638
639 if (c->assigned > try || c->length != 128) {
640 assign->assigned = try;
641 list_add_tail(&assign->head, &c->head);
642 return true;
643 } else if (c->assigned == try)
644 break;
645 }
646 }
647
648 return false;
649 }
650
651 void dhcpv6_ia_preupdate(struct interface *iface)
652 {
653 if (iface->dhcpv6 != RELAYD_SERVER)
654 return;
655
656 struct dhcpv6_assignment *c, *border = list_last_entry(
657 &iface->ia_assignments, struct dhcpv6_assignment, head);
658
659 list_for_each_entry(c, &iface->ia_assignments, head)
660 if (c != border && iface->ra_managed == RA_MANAGED_NO_MFLAG
661 && (c->flags & OAF_BOUND))
662 apply_lease(iface, c, false);
663 }
664
665 void dhcpv6_ia_postupdate(struct interface *iface)
666 {
667 if (iface->dhcpv6 != RELAYD_SERVER)
668 return;
669
670 time_t now = odhcpd_time();
671 int minprefix = -1;
672 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
673 if (iface->ia_addr[i].preferred > (uint32_t)now &&
674 iface->ia_addr[i].prefix < 64 &&
675 iface->ia_addr[i].prefix > minprefix)
676 minprefix = iface->ia_addr[i].prefix;
677 }
678
679 struct dhcpv6_assignment *border = list_last_entry(
680 &iface->ia_assignments, struct dhcpv6_assignment, head);
681
682 if (minprefix > 32 && minprefix <= 64)
683 border->assigned = 1U << (64 - minprefix);
684 else
685 border->assigned = 0;
686
687 struct list_head reassign = LIST_HEAD_INIT(reassign);
688 struct dhcpv6_assignment *c, *d;
689 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
690 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
691 c->managed_size)
692 continue;
693
694 if (c->length < 128 && c->assigned >= border->assigned && c != border)
695 list_move(&c->head, &reassign);
696 else if (c != border && (c->flags & OAF_BOUND))
697 apply_lease(iface, c, true);
698
699 if (c->accept_reconf && c->reconf_cnt == 0) {
700 c->reconf_cnt = 1;
701 c->reconf_sent = now;
702 send_reconf(iface, c);
703
704 /* Leave all other assignments of that client alone */
705 struct dhcpv6_assignment *a;
706 list_for_each_entry(a, &iface->ia_assignments, head)
707 if (a != c && a->clid_len == c->clid_len &&
708 !memcmp(a->clid_data, c->clid_data, a->clid_len))
709 c->reconf_cnt = INT_MAX;
710 }
711 }
712
713 while (!list_empty(&reassign)) {
714 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
715 list_del(&c->head);
716 if (!assign_pd(iface, c)) {
717 c->assigned = 0;
718 list_add(&c->head, &iface->ia_assignments);
719 }
720 }
721
722 dhcpv6_write_statefile();
723 }
724
725 static void reconf_timer(struct uloop_timeout *event)
726 {
727 time_t now = odhcpd_time();
728 struct interface *iface;
729 list_for_each_entry(iface, &interfaces, head) {
730 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
731 continue;
732
733 struct dhcpv6_assignment *a, *n;
734 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
735 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
736 if ((a->length < 128 && a->clid_len > 0) ||
737 (a->length == 128 && a->clid_len == 0))
738 free_dhcpv6_assignment(a);
739
740 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
741 now > a->reconf_sent + (1 << a->reconf_cnt)) {
742 ++a->reconf_cnt;
743 a->reconf_sent = now;
744 send_reconf(iface, a);
745 }
746 }
747 }
748 uloop_timeout_set(event, 2000);
749 }
750
751 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
752 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
753 struct interface *iface, bool request)
754 {
755 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
756 return 0;
757
758 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
759 size_t datalen = sizeof(out);
760 time_t now = odhcpd_time();
761
762 if (status) {
763 struct __attribute__((packed)) {
764 uint16_t type;
765 uint16_t len;
766 uint16_t value;
767 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
768 htons(status)};
769
770 memcpy(buf + datalen, &stat, sizeof(stat));
771 datalen += sizeof(stat);
772 } else {
773 if (a) {
774 uint32_t leasetime;
775 if (a->leasetime)
776 leasetime = a->leasetime;
777 else
778 leasetime = iface->dhcpv4_leasetime;
779
780 uint32_t pref = leasetime;
781 uint32_t valid = leasetime;
782
783 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
784 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
785 size_t m = get_preferred_addr(addrs, addrlen);
786
787 for (size_t i = 0; i < addrlen; ++i) {
788 uint32_t prefix_pref = addrs[i].preferred;
789 uint32_t prefix_valid = addrs[i].valid;
790
791 if (!valid_addr(&addrs[i], now))
792 continue;
793
794 if (prefix_pref != UINT32_MAX)
795 prefix_pref -= now;
796
797 if (prefix_valid != UINT32_MAX)
798 prefix_valid -= now;
799
800 if (a->length < 128) {
801 struct dhcpv6_ia_prefix p = {
802 .type = htons(DHCPV6_OPT_IA_PREFIX),
803 .len = htons(sizeof(p) - 4),
804 .preferred = htonl(prefix_pref),
805 .valid = htonl(prefix_valid),
806 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
807 .addr = addrs[i].addr.in6,
808 };
809 p.addr.s6_addr32[1] |= htonl(a->assigned);
810 p.addr.s6_addr32[2] = p.addr.s6_addr32[3] = 0;
811
812 size_t entrlen = sizeof(p) - 4;
813
814 if (datalen + entrlen + 4 > buflen ||
815 (a->assigned == 0 && a->managed_size == 0) ||
816 !valid_prefix_length(a, addrs[i].prefix))
817 continue;
818
819 memcpy(buf + datalen, &p, sizeof(p));
820 datalen += entrlen + 4;
821 } else {
822 struct dhcpv6_ia_addr n = {
823 .type = htons(DHCPV6_OPT_IA_ADDR),
824 .len = htons(sizeof(n) - 4),
825 .addr = addrs[i].addr.in6,
826 .preferred = htonl(prefix_pref),
827 .valid = htonl(prefix_valid)
828 };
829 n.addr.s6_addr32[3] = htonl(a->assigned);
830 size_t entrlen = sizeof(n) - 4;
831
832 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
833 a->assigned == 0 ||
834 datalen + entrlen + 4 > buflen)
835 continue;
836
837 memcpy(buf + datalen, &n, sizeof(n));
838 datalen += entrlen + 4;
839 }
840
841 /* Calculate T1 / T2 based on non-deprecated addresses */
842 if (prefix_pref > 0) {
843 if (prefix_pref < pref)
844 pref = prefix_pref;
845
846 if (prefix_valid < valid)
847 valid = prefix_valid;
848 }
849 }
850
851 if (!INFINITE_VALID(a->valid_until))
852 /* UINT32_MAX is considered as infinite leasetime */
853 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
854
855 out.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
856 out.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
857
858 if (!out.t1)
859 out.t1 = htonl(1);
860
861 if (!out.t2)
862 out.t2 = htonl(1);
863 }
864
865 if (!request) {
866 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
867 uint16_t otype, olen;
868 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
869 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
870 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
871 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
872 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
873 continue;
874
875 bool found = false;
876 if (a) {
877 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
878 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
879
880 for (size_t i = 0; i < addrlen; ++i) {
881 if (!valid_addr(&addrs[i], now))
882 continue;
883
884 struct in6_addr addr = addrs[i].addr.in6;
885 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
886 addr.s6_addr32[1] |= htonl(a->assigned);
887 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
888
889 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
890 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
891 found = true;
892 } else {
893 addr.s6_addr32[3] = htonl(a->assigned);
894
895 if (!memcmp(&n->addr, &addr, sizeof(addr)))
896 found = true;
897 }
898 }
899 }
900
901 if (!found) {
902 if (otype == DHCPV6_OPT_IA_PREFIX) {
903 struct dhcpv6_ia_prefix inv = {
904 .type = htons(DHCPV6_OPT_IA_PREFIX),
905 .len = htons(sizeof(inv) - 4),
906 .preferred = 0,
907 .valid = 0,
908 .prefix = p->prefix,
909 .addr = p->addr
910 };
911
912 if (datalen + sizeof(inv) > buflen)
913 continue;
914
915 memcpy(buf + datalen, &inv, sizeof(inv));
916 datalen += sizeof(inv);
917 } else {
918 struct dhcpv6_ia_addr inv = {
919 .type = htons(DHCPV6_OPT_IA_ADDR),
920 .len = htons(sizeof(inv) - 4),
921 .addr = n->addr,
922 .preferred = 0,
923 .valid = 0
924 };
925
926 if (datalen + sizeof(inv) > buflen)
927 continue;
928
929 memcpy(buf + datalen, &inv, sizeof(inv));
930 datalen += sizeof(inv);
931 }
932 }
933 }
934 }
935 }
936
937 out.len = htons(datalen - 4);
938 memcpy(buf, &out, sizeof(out));
939 return datalen;
940 }
941
942 struct log_ctxt {
943 char *buf;
944 int buf_len;
945 int buf_idx;
946 };
947
948 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
949 _unused uint32_t valid, void *arg)
950 {
951 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
952 char addrbuf[INET6_ADDRSTRLEN];
953
954 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
955 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
956 "%s/%d ", addrbuf, prefix);
957 }
958
959 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
960 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
961 {
962 const char *type = "UNKNOWN";
963 const char *status = "UNKNOWN";
964
965 if (msgtype == DHCPV6_MSG_RENEW)
966 return;
967
968 switch (msgtype) {
969 case DHCPV6_MSG_SOLICIT:
970 type = "SOLICIT";
971 break;
972 case DHCPV6_MSG_REQUEST:
973 type = "REQUEST";
974 break;
975 case DHCPV6_MSG_CONFIRM:
976 type = "CONFIRM";
977 break;
978 case DHCPV6_MSG_RENEW:
979 type = "RENEW";
980 break;
981 case DHCPV6_MSG_REBIND:
982 type = "REBIND";
983 break;
984 case DHCPV6_MSG_RELEASE:
985 type = "RELEASE";
986 break;
987 case DHCPV6_MSG_DECLINE:
988 type = "DECLINE";
989 break;
990 }
991
992 switch (code) {
993 case DHCPV6_STATUS_OK:
994 status = "ok";
995 break;
996 case DHCPV6_STATUS_NOADDRSAVAIL:
997 status = "no addresses available";
998 break;
999 case DHCPV6_STATUS_NOBINDING:
1000 status = "no binding";
1001 break;
1002 case DHCPV6_STATUS_NOTONLINK:
1003 status = "not on-link";
1004 break;
1005 case DHCPV6_STATUS_NOPREFIXAVAIL:
1006 status = "no prefix available";
1007 break;
1008 }
1009
1010 char leasebuf[256] = "";
1011
1012 if (a) {
1013 struct log_ctxt ctxt = {.buf = leasebuf,
1014 .buf_len = sizeof(leasebuf),
1015 .buf_idx = 0 };
1016
1017 dhcpv6_enum_ia_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1018 }
1019
1020 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1021 duidbuf, iface->ifname, status, leasebuf);
1022 }
1023
1024 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
1025 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1026 {
1027 time_t now = odhcpd_time();
1028 size_t response_len = 0;
1029 const struct dhcpv6_client_header *hdr = data;
1030 uint8_t *start = (uint8_t*)&hdr[1], *odata;
1031 uint16_t otype, olen;
1032 /* Find and parse client-id and hostname */
1033 bool accept_reconf = false;
1034 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1035 char hostname[256];
1036 size_t hostname_len = 0;
1037 bool notonlink = false;
1038 char duidbuf[261];
1039
1040 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1041 if (otype == DHCPV6_OPT_CLIENTID) {
1042 clid_data = odata;
1043 clid_len = olen;
1044
1045 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1046 memcpy(mac, &odata[8], sizeof(mac));
1047 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1048 memcpy(mac, &odata[4], sizeof(mac));
1049
1050 if (olen <= 130)
1051 odhcpd_hexlify(duidbuf, odata, olen);
1052 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1053 uint8_t fqdn_buf[256];
1054 memcpy(fqdn_buf, odata, olen);
1055 fqdn_buf[olen++] = 0;
1056
1057 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1058 hostname_len = strcspn(hostname, ".");
1059 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1060 accept_reconf = true;
1061 }
1062
1063 if (!clid_data || !clid_len || clid_len > 130)
1064 goto out;
1065
1066 struct dhcpv6_assignment *first = NULL;
1067 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1068 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1069 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1070 bool ia_addr_present = false;
1071 if (!is_pd && !is_na)
1072 continue;
1073
1074 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1075 size_t ia_response_len = 0;
1076 uint8_t reqlen = (is_pd) ? 62 : 128;
1077 uint32_t reqhint = 0;
1078
1079 /* Parse request hint for IA-PD */
1080 if (is_pd) {
1081 uint8_t *sdata;
1082 uint16_t stype, slen;
1083 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1084 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1085 continue;
1086
1087 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1088 if (p->prefix) {
1089 reqlen = p->prefix;
1090 reqhint = ntohl(p->addr.s6_addr32[1]);
1091 if (reqlen > 32 && reqlen <= 64)
1092 reqhint &= (1U << (64 - reqlen)) - 1;
1093 }
1094 }
1095
1096 if (reqlen > 64)
1097 reqlen = 64;
1098 } else if (is_na) {
1099 uint8_t *sdata;
1100 uint16_t stype, slen;
1101 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1102 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1103 continue;
1104
1105 ia_addr_present = true;
1106 }
1107 }
1108
1109 /* Find assignment */
1110 struct dhcpv6_assignment *c, *a = NULL;
1111 list_for_each_entry(c, &iface->ia_assignments, head) {
1112 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1113 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1114 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1115 (c->iaid == ia->iaid || INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1116 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1117 a = c;
1118
1119 /* Reset state */
1120 if (a->flags & OAF_BOUND)
1121 apply_lease(iface, a, false);
1122
1123 memcpy(a->clid_data, clid_data, clid_len);
1124 a->clid_len = clid_len;
1125 a->iaid = ia->iaid;
1126 a->peer = *addr;
1127 a->reconf_cnt = 0;
1128 a->reconf_sent = 0;
1129 break;
1130 }
1131 }
1132
1133 /* Generic message handling */
1134 uint16_t status = DHCPV6_STATUS_OK;
1135 if (a && a->managed_size < 0)
1136 return -1;
1137
1138 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1139 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1140 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1141 bool assigned = !!a;
1142
1143 if (!a && !iface->no_dynamic_dhcp) {
1144 /* Create new binding */
1145 a = calloc(1, sizeof(*a) + clid_len);
1146 if (a) {
1147 a->clid_len = clid_len;
1148 a->iaid = ia->iaid;
1149 a->length = reqlen;
1150 a->peer = *addr;
1151 a->assigned = reqhint;
1152 /* Set valid time to current time indicating */
1153 /* assignment is not having infinite lifetime */
1154 a->valid_until = now;
1155
1156 if (first)
1157 memcpy(a->key, first->key, sizeof(a->key));
1158 else
1159 odhcpd_urandom(a->key, sizeof(a->key));
1160 memcpy(a->clid_data, clid_data, clid_len);
1161
1162 if (is_pd)
1163 while (!(assigned = assign_pd(iface, a)) &&
1164 !a->managed_size && ++a->length <= 64);
1165 else
1166 assigned = assign_na(iface, a);
1167
1168 if (a->managed_size && !assigned)
1169 return -1;
1170 }
1171 }
1172
1173 if (!assigned || iface->ia_addr_len == 0)
1174 /* Set error status */
1175 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1176 else if (assigned && !first && hdr->msg_type != DHCPV6_MSG_REBIND) {
1177 size_t handshake_len = 4;
1178 buf[0] = 0;
1179 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1180 buf[2] = 0;
1181 buf[3] = 0;
1182
1183 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1184 struct dhcpv6_auth_reconfigure auth = {
1185 htons(DHCPV6_OPT_AUTH),
1186 htons(sizeof(auth) - 4),
1187 3, 1, 0,
1188 {htonl(time(NULL)), htonl(++serial)},
1189 1,
1190 {0}
1191 };
1192 memcpy(auth.key, a->key, sizeof(a->key));
1193 memcpy(buf + handshake_len, &auth, sizeof(auth));
1194 handshake_len += sizeof(auth);
1195 }
1196
1197 buf += handshake_len;
1198 buflen -= handshake_len;
1199 response_len += handshake_len;
1200
1201 first = a;
1202 }
1203
1204 ia_response_len = append_reply(buf, buflen, status, ia, a, iface,
1205 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1206
1207 /* Was only a solicitation: mark binding for removal */
1208 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1209 a->flags &= ~OAF_BOUND;
1210
1211 if (!(a->flags & OAF_STATIC))
1212 a->valid_until = now;
1213 } else if (assigned &&
1214 (hdr->msg_type == DHCPV6_MSG_REQUEST ||
1215 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1216 if (hostname_len > 0) {
1217 a->hostname = realloc(a->hostname, hostname_len + 1);
1218 if (a->hostname) {
1219 memcpy(a->hostname, hostname, hostname_len);
1220 a->hostname[hostname_len] = 0;
1221 }
1222 }
1223 a->accept_reconf = accept_reconf;
1224 a->flags |= OAF_BOUND;
1225 apply_lease(iface, a, true);
1226 } else if (!assigned && a && a->managed_size == 0) {
1227 /* Cleanup failed assignment */
1228 free_dhcpv6_assignment(a);
1229 a = NULL;
1230 }
1231 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1232 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1233 hdr->msg_type == DHCPV6_MSG_REBIND ||
1234 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1235 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1236 status = DHCPV6_STATUS_NOBINDING;
1237 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1238 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1239 hdr->msg_type == DHCPV6_MSG_REBIND) {
1240 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1241 if (a) {
1242 a->flags |= OAF_BOUND;
1243 apply_lease(iface, a, true);
1244 }
1245 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1246 if (!(a->flags & OAF_STATIC))
1247 a->valid_until = now - 1;
1248
1249 if (a->flags & OAF_BOUND) {
1250 apply_lease(iface, a, false);
1251 a->flags &= ~OAF_BOUND;
1252 }
1253 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1254 a->flags &= ~OAF_BOUND;
1255
1256 if (!(a->flags & OAF_STATIC)) {
1257 a->clid_len = 0;
1258 a->valid_until = now + 3600; /* Block address for 1h */
1259 }
1260 }
1261 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1262 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1263 status = DHCPV6_STATUS_NOTONLINK;
1264 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1265 notonlink = true;
1266 }
1267
1268 buf += ia_response_len;
1269 buflen -= ia_response_len;
1270 response_len += ia_response_len;
1271 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1272 }
1273
1274 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1275 response_len + 6 < buflen) {
1276 buf[0] = 0;
1277 buf[1] = DHCPV6_OPT_STATUS;
1278 buf[2] = 0;
1279 buf[3] = 2;
1280 buf[4] = 0;
1281 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1282 response_len += 6;
1283 }
1284
1285 dhcpv6_write_statefile();
1286
1287 out:
1288 return response_len;
1289 }
OpenWrt DHCP Server