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