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c2221d81baf1fe56dbe4ee2cf62f7d8e178e2a6f
[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)->managed == RELAYD_MANAGED_NO_AFLAG || (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;
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;
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->managed && (c->flags & OAF_BOUND))
661 apply_lease(iface, c, false);
662 }
663
664 void dhcpv6_ia_postupdate(struct interface *iface, time_t now)
665 {
666 if (iface->dhcpv6 != RELAYD_SERVER)
667 return;
668
669 int minprefix = -1;
670 for (size_t i = 0; i < iface->ia_addr_len; ++i) {
671 if (iface->ia_addr[i].preferred > (uint32_t)now &&
672 iface->ia_addr[i].prefix < 64 &&
673 iface->ia_addr[i].prefix > minprefix)
674 minprefix = iface->ia_addr[i].prefix;
675 }
676
677 struct dhcpv6_assignment *border = list_last_entry(
678 &iface->ia_assignments, struct dhcpv6_assignment, head);
679
680 if (minprefix > 32 && minprefix <= 64)
681 border->assigned = 1U << (64 - minprefix);
682 else
683 border->assigned = 0;
684
685 struct list_head reassign = LIST_HEAD_INIT(reassign);
686 struct dhcpv6_assignment *c, *d;
687 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
688 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
689 c->managed_size)
690 continue;
691
692 if (c->length < 128 && c->assigned >= border->assigned && c != border)
693 list_move(&c->head, &reassign);
694 else if (c != border && (c->flags & OAF_BOUND))
695 apply_lease(iface, c, true);
696
697 if (c->accept_reconf && c->reconf_cnt == 0) {
698 c->reconf_cnt = 1;
699 c->reconf_sent = now;
700 send_reconf(iface, c);
701
702 /* Leave all other assignments of that client alone */
703 struct dhcpv6_assignment *a;
704 list_for_each_entry(a, &iface->ia_assignments, head)
705 if (a != c && a->clid_len == c->clid_len &&
706 !memcmp(a->clid_data, c->clid_data, a->clid_len))
707 c->reconf_cnt = INT_MAX;
708 }
709 }
710
711 while (!list_empty(&reassign)) {
712 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
713 list_del(&c->head);
714 if (!assign_pd(iface, c)) {
715 c->assigned = 0;
716 list_add(&c->head, &iface->ia_assignments);
717 }
718 }
719
720 dhcpv6_write_statefile();
721 }
722
723 static void reconf_timer(struct uloop_timeout *event)
724 {
725 time_t now = odhcpd_time();
726 struct interface *iface;
727 list_for_each_entry(iface, &interfaces, head) {
728 if (iface->dhcpv6 != RELAYD_SERVER || iface->ia_assignments.next == NULL)
729 continue;
730
731 struct dhcpv6_assignment *a, *n;
732 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
733 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
734 if ((a->length < 128 && a->clid_len > 0) ||
735 (a->length == 128 && a->clid_len == 0))
736 free_dhcpv6_assignment(a);
737
738 } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 &&
739 now > a->reconf_sent + (1 << a->reconf_cnt)) {
740 ++a->reconf_cnt;
741 a->reconf_sent = now;
742 send_reconf(iface, a);
743 }
744 }
745 }
746 uloop_timeout_set(event, 2000);
747 }
748
749 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
750 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
751 struct interface *iface, bool request)
752 {
753 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
754 return 0;
755
756 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
757 size_t datalen = sizeof(out);
758 time_t now = odhcpd_time();
759
760 if (status) {
761 struct __attribute__((packed)) {
762 uint16_t type;
763 uint16_t len;
764 uint16_t value;
765 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
766 htons(status)};
767
768 memcpy(buf + datalen, &stat, sizeof(stat));
769 datalen += sizeof(stat);
770 } else {
771 if (a) {
772 uint32_t leasetime;
773 if (a->leasetime)
774 leasetime = a->leasetime;
775 else
776 leasetime = iface->dhcpv4_leasetime;
777
778 uint32_t pref = leasetime;
779 uint32_t valid = leasetime;
780
781 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
782 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
783 size_t m = get_preferred_addr(addrs, addrlen);
784
785 for (size_t i = 0; i < addrlen; ++i) {
786 uint32_t prefix_pref = addrs[i].preferred;
787 uint32_t prefix_valid = addrs[i].valid;
788
789 if (!valid_addr(&addrs[i], now))
790 continue;
791
792 if (prefix_pref != UINT32_MAX)
793 prefix_pref -= now;
794
795 if (prefix_valid != UINT32_MAX)
796 prefix_valid -= now;
797
798 if (a->length < 128) {
799 struct dhcpv6_ia_prefix p = {
800 .type = htons(DHCPV6_OPT_IA_PREFIX),
801 .len = htons(sizeof(p) - 4),
802 .preferred = htonl(prefix_pref),
803 .valid = htonl(prefix_valid),
804 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
805 .addr = addrs[i].addr
806 };
807 p.addr.s6_addr32[1] |= htonl(a->assigned);
808 p.addr.s6_addr32[2] = p.addr.s6_addr32[3] = 0;
809
810 size_t entrlen = sizeof(p) - 4;
811
812 if (datalen + entrlen + 4 > buflen ||
813 (a->assigned == 0 && a->managed_size == 0) ||
814 !valid_prefix_length(a, addrs[i].prefix))
815 continue;
816
817 memcpy(buf + datalen, &p, sizeof(p));
818 datalen += entrlen + 4;
819 } else {
820 struct dhcpv6_ia_addr n = {
821 .type = htons(DHCPV6_OPT_IA_ADDR),
822 .len = htons(sizeof(n) - 4),
823 .addr = addrs[i].addr,
824 .preferred = htonl(prefix_pref),
825 .valid = htonl(prefix_valid)
826 };
827 n.addr.s6_addr32[3] = htonl(a->assigned);
828 size_t entrlen = sizeof(n) - 4;
829
830 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
831 a->assigned == 0 ||
832 datalen + entrlen + 4 > buflen)
833 continue;
834
835 memcpy(buf + datalen, &n, sizeof(n));
836 datalen += entrlen + 4;
837 }
838
839 /* Calculate T1 / T2 based on non-deprecated addresses */
840 if (prefix_pref > 0) {
841 if (prefix_pref < pref)
842 pref = prefix_pref;
843
844 if (prefix_valid < valid)
845 valid = prefix_valid;
846 }
847 }
848
849 if (!INFINITE_VALID(a->valid_until))
850 /* UINT32_MAX is considered as infinite leasetime */
851 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
852
853 out.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
854 out.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
855
856 if (!out.t1)
857 out.t1 = htonl(1);
858
859 if (!out.t2)
860 out.t2 = htonl(1);
861 }
862
863 if (!request) {
864 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
865 uint16_t otype, olen;
866 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
867 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
868 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
869 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
870 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
871 continue;
872
873 bool found = false;
874 if (a) {
875 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr;
876 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len;
877
878 for (size_t i = 0; i < addrlen; ++i) {
879 if (!valid_addr(&addrs[i], now))
880 continue;
881
882 struct in6_addr addr = addrs[i].addr;
883 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
884 addr.s6_addr32[1] |= htonl(a->assigned);
885 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
886
887 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
888 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
889 found = true;
890 } else {
891 addr.s6_addr32[3] = htonl(a->assigned);
892
893 if (!memcmp(&n->addr, &addr, sizeof(addr)))
894 found = true;
895 }
896 }
897 }
898
899 if (!found) {
900 if (otype == DHCPV6_OPT_IA_PREFIX) {
901 struct dhcpv6_ia_prefix inv = {
902 .type = htons(DHCPV6_OPT_IA_PREFIX),
903 .len = htons(sizeof(inv) - 4),
904 .preferred = 0,
905 .valid = 0,
906 .prefix = p->prefix,
907 .addr = p->addr
908 };
909
910 if (datalen + sizeof(inv) > buflen)
911 continue;
912
913 memcpy(buf + datalen, &inv, sizeof(inv));
914 datalen += sizeof(inv);
915 } else {
916 struct dhcpv6_ia_addr inv = {
917 .type = htons(DHCPV6_OPT_IA_ADDR),
918 .len = htons(sizeof(inv) - 4),
919 .addr = n->addr,
920 .preferred = 0,
921 .valid = 0
922 };
923
924 if (datalen + sizeof(inv) > buflen)
925 continue;
926
927 memcpy(buf + datalen, &inv, sizeof(inv));
928 datalen += sizeof(inv);
929 }
930 }
931 }
932 }
933 }
934
935 out.len = htons(datalen - 4);
936 memcpy(buf, &out, sizeof(out));
937 return datalen;
938 }
939
940 struct log_ctxt {
941 char *buf;
942 int buf_len;
943 int buf_idx;
944 };
945
946 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
947 _unused uint32_t valid, void *arg)
948 {
949 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
950 char addrbuf[INET6_ADDRSTRLEN];
951
952 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
953 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
954 "%s/%d ", addrbuf, prefix);
955 }
956
957 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
958 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
959 {
960 const char *type = "UNKNOWN";
961 const char *status = "UNKNOWN";
962
963 if (msgtype == DHCPV6_MSG_RENEW)
964 return;
965
966 switch (msgtype) {
967 case DHCPV6_MSG_SOLICIT:
968 type = "SOLICIT";
969 break;
970 case DHCPV6_MSG_REQUEST:
971 type = "REQUEST";
972 break;
973 case DHCPV6_MSG_CONFIRM:
974 type = "CONFIRM";
975 break;
976 case DHCPV6_MSG_RENEW:
977 type = "RENEW";
978 break;
979 case DHCPV6_MSG_REBIND:
980 type = "REBIND";
981 break;
982 case DHCPV6_MSG_RELEASE:
983 type = "RELEASE";
984 break;
985 case DHCPV6_MSG_DECLINE:
986 type = "DECLINE";
987 break;
988 }
989
990 switch (code) {
991 case DHCPV6_STATUS_OK:
992 status = "ok";
993 break;
994 case DHCPV6_STATUS_NOADDRSAVAIL:
995 status = "no addresses available";
996 break;
997 case DHCPV6_STATUS_NOBINDING:
998 status = "no binding";
999 break;
1000 case DHCPV6_STATUS_NOTONLINK:
1001 status = "not on-link";
1002 break;
1003 case DHCPV6_STATUS_NOPREFIXAVAIL:
1004 status = "no prefix available";
1005 break;
1006 }
1007
1008 char leasebuf[256] = "";
1009
1010 if (a) {
1011 struct log_ctxt ctxt = {.buf = leasebuf,
1012 .buf_len = sizeof(leasebuf),
1013 .buf_idx = 0 };
1014
1015 dhcpv6_enum_ia_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1016 }
1017
1018 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1019 duidbuf, iface->ifname, status, leasebuf);
1020 }
1021
1022 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
1023 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1024 {
1025 time_t now = odhcpd_time();
1026 size_t response_len = 0;
1027 const struct dhcpv6_client_header *hdr = data;
1028 uint8_t *start = (uint8_t*)&hdr[1], *odata;
1029 uint16_t otype, olen;
1030 /* Find and parse client-id and hostname */
1031 bool accept_reconf = false;
1032 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1033 char hostname[256];
1034 size_t hostname_len = 0;
1035 bool notonlink = false;
1036 char duidbuf[261];
1037
1038 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1039 if (otype == DHCPV6_OPT_CLIENTID) {
1040 clid_data = odata;
1041 clid_len = olen;
1042
1043 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1044 memcpy(mac, &odata[8], sizeof(mac));
1045 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1046 memcpy(mac, &odata[4], sizeof(mac));
1047
1048 if (olen <= 130)
1049 odhcpd_hexlify(duidbuf, odata, olen);
1050 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1051 uint8_t fqdn_buf[256];
1052 memcpy(fqdn_buf, odata, olen);
1053 fqdn_buf[olen++] = 0;
1054
1055 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1056 hostname_len = strcspn(hostname, ".");
1057 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1058 accept_reconf = true;
1059 }
1060
1061 if (!clid_data || !clid_len || clid_len > 130)
1062 goto out;
1063
1064 struct dhcpv6_assignment *first = NULL;
1065 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1066 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1067 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1068 bool ia_addr_present = false;
1069 if (!is_pd && !is_na)
1070 continue;
1071
1072 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1073 size_t ia_response_len = 0;
1074 uint8_t reqlen = (is_pd) ? 62 : 128;
1075 uint32_t reqhint = 0;
1076
1077 /* Parse request hint for IA-PD */
1078 if (is_pd) {
1079 uint8_t *sdata;
1080 uint16_t stype, slen;
1081 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1082 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1083 continue;
1084
1085 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1086 if (p->prefix) {
1087 reqlen = p->prefix;
1088 reqhint = ntohl(p->addr.s6_addr32[1]);
1089 if (reqlen > 32 && reqlen <= 64)
1090 reqhint &= (1U << (64 - reqlen)) - 1;
1091 }
1092 }
1093
1094 if (reqlen > 64)
1095 reqlen = 64;
1096 } else if (is_na) {
1097 uint8_t *sdata;
1098 uint16_t stype, slen;
1099 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1100 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1101 continue;
1102
1103 ia_addr_present = true;
1104 }
1105 }
1106
1107 /* Find assignment */
1108 struct dhcpv6_assignment *c, *a = NULL;
1109 list_for_each_entry(c, &iface->ia_assignments, head) {
1110 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1111 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1112 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1113 (c->iaid == ia->iaid || INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1114 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1115 a = c;
1116
1117 /* Reset state */
1118 if (a->flags & OAF_BOUND)
1119 apply_lease(iface, a, false);
1120
1121 memcpy(a->clid_data, clid_data, clid_len);
1122 a->clid_len = clid_len;
1123 a->iaid = ia->iaid;
1124 a->peer = *addr;
1125 a->reconf_cnt = 0;
1126 a->reconf_sent = 0;
1127 break;
1128 }
1129 }
1130
1131 /* Generic message handling */
1132 uint16_t status = DHCPV6_STATUS_OK;
1133 if (a && a->managed_size < 0)
1134 return -1;
1135
1136 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1137 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1138 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1139 bool assigned = !!a;
1140
1141 if (!a && !iface->no_dynamic_dhcp) {
1142 /* Create new binding */
1143 a = calloc(1, sizeof(*a) + clid_len);
1144 if (a) {
1145 a->clid_len = clid_len;
1146 a->iaid = ia->iaid;
1147 a->length = reqlen;
1148 a->peer = *addr;
1149 a->assigned = reqhint;
1150 /* Set valid time to current time indicating */
1151 /* assignment is not having infinite lifetime */
1152 a->valid_until = now;
1153
1154 if (first)
1155 memcpy(a->key, first->key, sizeof(a->key));
1156 else
1157 odhcpd_urandom(a->key, sizeof(a->key));
1158 memcpy(a->clid_data, clid_data, clid_len);
1159
1160 if (is_pd)
1161 while (!(assigned = assign_pd(iface, a)) &&
1162 !a->managed_size && ++a->length <= 64);
1163 else
1164 assigned = assign_na(iface, a);
1165
1166 if (a->managed_size && !assigned)
1167 return -1;
1168 }
1169 }
1170
1171 if (!assigned || iface->ia_addr_len == 0)
1172 /* Set error status */
1173 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1174 else if (assigned && !first && hdr->msg_type != DHCPV6_MSG_REBIND) {
1175 size_t handshake_len = 4;
1176 buf[0] = 0;
1177 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1178 buf[2] = 0;
1179 buf[3] = 0;
1180
1181 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1182 struct dhcpv6_auth_reconfigure auth = {
1183 htons(DHCPV6_OPT_AUTH),
1184 htons(sizeof(auth) - 4),
1185 3, 1, 0,
1186 {htonl(time(NULL)), htonl(++serial)},
1187 1,
1188 {0}
1189 };
1190 memcpy(auth.key, a->key, sizeof(a->key));
1191 memcpy(buf + handshake_len, &auth, sizeof(auth));
1192 handshake_len += sizeof(auth);
1193 }
1194
1195 buf += handshake_len;
1196 buflen -= handshake_len;
1197 response_len += handshake_len;
1198
1199 first = a;
1200 }
1201
1202 ia_response_len = append_reply(buf, buflen, status, ia, a, iface,
1203 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1204
1205 /* Was only a solicitation: mark binding for removal */
1206 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1207 a->flags &= ~OAF_BOUND;
1208
1209 if (!(a->flags & OAF_STATIC))
1210 a->valid_until = now;
1211 } else if (assigned &&
1212 (hdr->msg_type == DHCPV6_MSG_REQUEST ||
1213 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1214 if (hostname_len > 0) {
1215 a->hostname = realloc(a->hostname, hostname_len + 1);
1216 if (a->hostname) {
1217 memcpy(a->hostname, hostname, hostname_len);
1218 a->hostname[hostname_len] = 0;
1219 }
1220 }
1221 a->accept_reconf = accept_reconf;
1222 a->flags |= OAF_BOUND;
1223 apply_lease(iface, a, true);
1224 } else if (!assigned && a && a->managed_size == 0) {
1225 /* Cleanup failed assignment */
1226 free_dhcpv6_assignment(a);
1227 a = NULL;
1228 }
1229 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1230 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1231 hdr->msg_type == DHCPV6_MSG_REBIND ||
1232 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1233 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1234 status = DHCPV6_STATUS_NOBINDING;
1235 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1236 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1237 hdr->msg_type == DHCPV6_MSG_REBIND) {
1238 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1239 if (a) {
1240 a->flags |= OAF_BOUND;
1241 apply_lease(iface, a, true);
1242 }
1243 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1244 if (!(a->flags & OAF_STATIC))
1245 a->valid_until = now - 1;
1246
1247 if (a->flags & OAF_BOUND) {
1248 apply_lease(iface, a, false);
1249 a->flags &= ~OAF_BOUND;
1250 }
1251 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1252 a->flags &= ~OAF_BOUND;
1253
1254 if (!(a->flags & OAF_STATIC)) {
1255 a->clid_len = 0;
1256 a->valid_until = now + 3600; /* Block address for 1h */
1257 }
1258 }
1259 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1260 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1261 status = DHCPV6_STATUS_NOTONLINK;
1262 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1263 notonlink = true;
1264 }
1265
1266 buf += ia_response_len;
1267 buflen -= ia_response_len;
1268 response_len += ia_response_len;
1269 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1270 }
1271
1272 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1273 response_len + 6 < buflen) {
1274 buf[0] = 0;
1275 buf[1] = DHCPV6_OPT_STATUS;
1276 buf[2] = 0;
1277 buf[3] = 2;
1278 buf[4] = 0;
1279 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1280 response_len += 6;
1281 }
1282
1283 dhcpv6_write_statefile();
1284
1285 out:
1286 return response_len;
1287 }
OpenWrt DHCP Server