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dhcpv6-ia: keep tentative assignments alive for a short time
[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 dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info);
43 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c);
44 static void handle_addrlist_change(struct netevent_handler_info *info);
45 static void start_reconf(struct dhcpv6_assignment *a);
46 static void stop_reconf(struct dhcpv6_assignment *a);
47 static void valid_until_cb(struct uloop_timeout *event);
48
49 static struct netevent_handler dhcpv6_netevent_handler = { .cb = dhcpv6_netevent_cb, };
50 static struct uloop_timeout valid_until_timeout = {.cb = valid_until_cb};
51 static uint32_t serial = 0;
52 static uint8_t statemd5[16];
53
54 int dhcpv6_ia_init(void)
55 {
56 uloop_timeout_set(&valid_until_timeout, 1000);
57
58 netlink_add_netevent_handler(&dhcpv6_netevent_handler);
59
60 return 0;
61 }
62
63 int dhcpv6_setup_ia_interface(struct interface *iface, bool enable)
64 {
65 if (!enable && iface->ia_assignments.next) {
66 struct dhcpv6_assignment *c;
67
68 while (!list_empty(&iface->ia_assignments)) {
69 c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head);
70 free_dhcpv6_assignment(c);
71 }
72 }
73
74 if (enable && iface->dhcpv6 == MODE_SERVER) {
75 if (!iface->ia_assignments.next)
76 INIT_LIST_HEAD(&iface->ia_assignments);
77
78 if (list_empty(&iface->ia_assignments)) {
79 struct dhcpv6_assignment *border = calloc(1, sizeof(*border));
80 if (!border) {
81 syslog(LOG_ERR, "Calloc failed for border on interface %s", iface->ifname);
82 return -1;
83 }
84
85 border->length = 64;
86 list_add(&border->head, &iface->ia_assignments);
87 }
88
89 /* Parse static entries */
90 struct lease *lease;
91 list_for_each_entry(lease, &leases, head) {
92 /* Construct entry */
93 size_t duid_len = lease->duid_len ? lease->duid_len : 14;
94 struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + duid_len);
95 if (!a) {
96 syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
97 iface->ifname);
98 return -1;
99 }
100
101 a->leasetime = lease->dhcpv4_leasetime;
102
103 a->clid_len = duid_len;
104 a->length = 128;
105 if (lease->hostid) {
106 a->assigned = lease->hostid;
107 } else {
108 uint32_t i4a = ntohl(lease->ipaddr.s_addr) & 0xff;
109 a->assigned = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
110 }
111
112 odhcpd_urandom(a->key, sizeof(a->key));
113 memcpy(a->clid_data, lease->duid, lease->duid_len);
114 memcpy(a->mac, lease->mac.ether_addr_octet, sizeof(a->mac));
115 /* Static assignment */
116 a->flags |= OAF_STATIC;
117 /* Infinite valid */
118 a->valid_until = 0;
119
120 /* Assign to all interfaces */
121 struct dhcpv6_assignment *c;
122 list_for_each_entry(c, &iface->ia_assignments, head) {
123 if (c->length != 128 || c->assigned > a->assigned) {
124 list_add_tail(&a->head, &c->head);
125 break;
126 } else if (c->assigned == a->assigned)
127 /* Already an assignment with that number */
128 break;
129 }
130
131 if (a->head.next) {
132 a->iface = iface;
133 if (lease->hostname[0]) {
134 free(a->hostname);
135 a->hostname = strdup(lease->hostname);
136 }
137 } else
138 free_dhcpv6_assignment(a);
139 }
140 }
141 return 0;
142 }
143
144
145 static void dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info)
146 {
147 struct interface *iface = info->iface;
148
149 if (!iface || iface->dhcpv6 != MODE_SERVER)
150 return;
151
152 switch (event) {
153 case NETEV_ADDR6LIST_CHANGE:
154 handle_addrlist_change(info);
155 break;
156 default:
157 break;
158 }
159 }
160
161
162 static void free_dhcpv6_assignment(struct dhcpv6_assignment *c)
163 {
164 if (c->managed_sock.fd.registered) {
165 ustream_free(&c->managed_sock.stream);
166 close(c->managed_sock.fd.fd);
167 }
168
169 if (c->head.next)
170 list_del(&c->head);
171
172 if (c->reconf_cnt)
173 stop_reconf(c);
174
175 free(c->managed);
176 free(c->hostname);
177 free(c);
178 }
179
180 static inline bool valid_prefix_length(const struct dhcpv6_assignment *a, const uint8_t prefix_length)
181 {
182 return (a->managed_size || a->length > prefix_length);
183 }
184
185 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
186 {
187 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
188 }
189
190 static size_t get_preferred_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
191 {
192 size_t i, m;
193
194 for (i = 0, m = 0; i < addrlen; ++i) {
195 if (addrs[i].preferred > addrs[m].preferred ||
196 (addrs[i].preferred == addrs[m].preferred &&
197 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
198 m = i;
199 }
200
201 return m;
202 }
203
204 static int send_reconf(struct dhcpv6_assignment *assign)
205 {
206 struct {
207 struct dhcpv6_client_header hdr;
208 uint16_t srvid_type;
209 uint16_t srvid_len;
210 uint16_t duid_type;
211 uint16_t hardware_type;
212 uint8_t mac[6];
213 uint16_t msg_type;
214 uint16_t msg_len;
215 uint8_t msg_id;
216 struct dhcpv6_auth_reconfigure auth;
217 uint16_t clid_type;
218 uint16_t clid_len;
219 uint8_t clid_data[128];
220 } __attribute__((packed)) reconf_msg = {
221 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
222 .srvid_type = htons(DHCPV6_OPT_SERVERID),
223 .srvid_len = htons(10),
224 .duid_type = htons(3),
225 .hardware_type = htons(1),
226 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
227 .msg_len = htons(1),
228 .msg_id = DHCPV6_MSG_RENEW,
229 .auth = {htons(DHCPV6_OPT_AUTH),
230 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
231 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
232 .clid_type = htons(DHCPV6_OPT_CLIENTID),
233 .clid_len = htons(assign->clid_len),
234 .clid_data = {0},
235 };
236 struct interface *iface = assign->iface;
237
238 odhcpd_get_mac(iface, reconf_msg.mac);
239 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
240 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
241
242 md5_ctx_t md5;
243 uint8_t secretbytes[64];
244 memset(secretbytes, 0, sizeof(secretbytes));
245 memcpy(secretbytes, assign->key, sizeof(assign->key));
246
247 for (size_t i = 0; i < sizeof(secretbytes); ++i)
248 secretbytes[i] ^= 0x36;
249
250 md5_begin(&md5);
251 md5_hash(secretbytes, sizeof(secretbytes), &md5);
252 md5_hash(iov.iov_base, iov.iov_len, &md5);
253 md5_end(reconf_msg.auth.key, &md5);
254
255 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
256 secretbytes[i] ^= 0x36;
257 secretbytes[i] ^= 0x5c;
258 }
259
260 md5_begin(&md5);
261 md5_hash(secretbytes, sizeof(secretbytes), &md5);
262 md5_hash(reconf_msg.auth.key, 16, &md5);
263 md5_end(reconf_msg.auth.key, &md5);
264
265 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
266 }
267
268 void dhcpv6_enum_ia_addrs(struct interface *iface, struct dhcpv6_assignment *c,
269 time_t now, dhcpv6_binding_cb_handler_t func, void *arg)
270 {
271 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->addr6;
272 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->addr6_len;
273 size_t m = get_preferred_addr(addrs, addrlen);
274
275 for (size_t i = 0; i < addrlen; ++i) {
276 struct in6_addr addr;
277 uint32_t pref, valid;
278 int prefix = c->managed ? addrs[i].prefix : c->length;
279
280 if (!valid_addr(&addrs[i], now))
281 continue;
282
283 addr = addrs[i].addr.in6;
284 pref = addrs[i].preferred;
285 valid = addrs[i].valid;
286 if (prefix == 128) {
287 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs))
288 continue;
289
290 addr.s6_addr32[3] = htonl(c->assigned);
291 } else {
292 if (!valid_prefix_length(c, addrs[i].prefix))
293 continue;
294
295 addr.s6_addr32[1] |= htonl(c->assigned);
296 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
297 }
298
299 if (pref != UINT32_MAX)
300 pref -= now;
301
302 if (valid != UINT32_MAX)
303 valid -= now;
304
305 func(&addr, prefix, pref, valid, arg);
306 }
307 }
308
309 struct write_ctxt {
310 FILE *fp;
311 md5_ctx_t md5;
312 struct dhcpv6_assignment *c;
313 struct interface *iface;
314 char *buf;
315 int buf_len;
316 int buf_idx;
317 };
318
319 void dhcpv6_write_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
320 _unused uint32_t valid, void *arg)
321 {
322 struct write_ctxt *ctxt = (struct write_ctxt *)arg;
323 char ipbuf[INET6_ADDRSTRLEN];
324
325 inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf) - 1);
326
327 if (ctxt->c->length == 128 && ctxt->c->hostname) {
328 fputs(ipbuf, ctxt->fp);
329
330 char b[256];
331 if (dn_expand(ctxt->iface->search, ctxt->iface->search + ctxt->iface->search_len,
332 ctxt->iface->search, b, sizeof(b)) > 0)
333 fprintf(ctxt->fp, "\t%s.%s", ctxt->c->hostname, b);
334
335 fprintf(ctxt->fp, "\t%s\n", ctxt->c->hostname);
336 md5_hash(ipbuf, strlen(ipbuf), &ctxt->md5);
337 md5_hash(ctxt->c->hostname, strlen(ctxt->c->hostname), &ctxt->md5);
338 }
339
340 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx,ctxt->buf_len - ctxt->buf_idx,
341 "%s/%d ", ipbuf, prefix);
342 }
343
344 void dhcpv6_write_statefile(void)
345 {
346 struct write_ctxt ctxt;
347
348 md5_begin(&ctxt.md5);
349
350 if (config.dhcp_statefile) {
351 time_t now = odhcpd_time(), wall_time = time(NULL);
352 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
353 char leasebuf[512];
354
355 if (fd < 0)
356 return;
357 int ret;
358 ret = lockf(fd, F_LOCK, 0);
359 if (ret < 0) {
360 close(fd);
361 return;
362 }
363 if (ftruncate(fd, 0) < 0) {}
364
365 ctxt.fp = fdopen(fd, "w");
366 if (!ctxt.fp) {
367 close(fd);
368 return;
369 }
370
371 ctxt.buf = leasebuf;
372 ctxt.buf_len = sizeof(leasebuf);
373
374 list_for_each_entry(ctxt.iface, &interfaces, head) {
375 if (ctxt.iface->dhcpv6 != MODE_SERVER &&
376 ctxt.iface->dhcpv4 != MODE_SERVER)
377 continue;
378
379 if (ctxt.iface->dhcpv6 == MODE_SERVER &&
380 ctxt.iface->ia_assignments.next) {
381 list_for_each_entry(ctxt.c, &ctxt.iface->ia_assignments, head) {
382 if (!(ctxt.c->flags & OAF_BOUND) || ctxt.c->managed_size < 0)
383 continue;
384
385 char duidbuf[264];
386
387 odhcpd_hexlify(duidbuf, ctxt.c->clid_data, ctxt.c->clid_len);
388
389 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
390 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s %x %s %ld %x %u ",
391 ctxt.iface->ifname, duidbuf, ntohl(ctxt.c->iaid),
392 (ctxt.c->hostname ? ctxt.c->hostname : "-"),
393 (ctxt.c->valid_until > now ?
394 (ctxt.c->valid_until - now + wall_time) :
395 (INFINITE_VALID(ctxt.c->valid_until) ? -1 : 0)),
396 ctxt.c->assigned, (unsigned)ctxt.c->length);
397
398 if (INFINITE_VALID(ctxt.c->valid_until) || ctxt.c->valid_until > now)
399 dhcpv6_enum_ia_addrs(ctxt.iface, ctxt.c, now,
400 dhcpv6_write_ia_addr, &ctxt);
401
402 ctxt.buf[ctxt.buf_idx - 1] = '\n';
403 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
404 }
405 }
406
407 if (ctxt.iface->dhcpv4 == MODE_SERVER &&
408 ctxt.iface->dhcpv4_assignments.next) {
409 struct dhcpv4_assignment *c;
410 list_for_each_entry(c, &ctxt.iface->dhcpv4_assignments, head) {
411 if (!(c->flags & OAF_BOUND))
412 continue;
413
414 char ipbuf[INET6_ADDRSTRLEN];
415 char duidbuf[16];
416 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
417
418 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
419 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s ipv4 %s %ld %x 32 ",
420 ctxt.iface->ifname, duidbuf,
421 (c->hostname ? c->hostname : "-"),
422 (c->valid_until > now ?
423 (c->valid_until - now + wall_time) :
424 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
425 ntohl(c->addr));
426
427 struct in_addr addr = {.s_addr = c->addr};
428 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
429
430 if (c->hostname) {
431 fputs(ipbuf, ctxt.fp);
432
433 char b[256];
434 if (dn_expand(ctxt.iface->search,
435 ctxt.iface->search + ctxt.iface->search_len,
436 ctxt.iface->search, b, sizeof(b)) > 0)
437 fprintf(ctxt.fp, "\t%s.%s", c->hostname, b);
438
439 fprintf(ctxt.fp, "\t%s\n", c->hostname);
440 md5_hash(ipbuf, strlen(ipbuf), &ctxt.md5);
441 md5_hash(c->hostname, strlen(c->hostname), &ctxt.md5);
442 }
443
444 ctxt.buf_idx += snprintf(ctxt.buf + ctxt.buf_idx,
445 ctxt.buf_len - ctxt.buf_idx,
446 "%s/32 ", ipbuf);
447 ctxt.buf[ctxt.buf_idx - 1] = '\n';
448 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
449 }
450 }
451 }
452
453 fclose(ctxt.fp);
454 }
455
456 uint8_t newmd5[16];
457 md5_end(newmd5, &ctxt.md5);
458
459 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
460 memcpy(statemd5, newmd5, sizeof(statemd5));
461 char *argv[2] = {config.dhcp_cb, NULL};
462 if (!vfork()) {
463 execv(argv[0], argv);
464 _exit(128);
465 }
466 }
467 }
468
469 static void __apply_lease(struct interface *iface, struct dhcpv6_assignment *a,
470 struct odhcpd_ipaddr *addrs, ssize_t addr_len, bool add)
471 {
472 if (a->length > 64)
473 return;
474
475 for (ssize_t i = 0; i < addr_len; ++i) {
476 struct in6_addr prefix = addrs[i].addr.in6;
477 prefix.s6_addr32[1] |= htonl(a->assigned);
478 prefix.s6_addr32[2] = prefix.s6_addr32[3] = 0;
479 netlink_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
480 iface->ifindex, &a->peer.sin6_addr, 1024, add);
481 }
482 }
483
484 static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add)
485 {
486 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
487 ssize_t addrlen = (a->managed) ? a->managed_size : (ssize_t)iface->addr6_len;
488
489 __apply_lease(iface, a, addrs, addrlen, add);
490 }
491
492 /* More data was received from TCP connection */
493 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
494 {
495 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
496 time_t now = odhcpd_time();
497 bool first = c->managed_size < 0;
498
499 for (;;) {
500 int pending;
501 char *data = ustream_get_read_buf(s, &pending);
502 char *end = memmem(data, pending, "\n\n", 2);
503
504 if (!end)
505 break;
506
507 end += 2;
508 end[-1] = 0;
509
510 c->managed_size = 0;
511 if (c->accept_reconf)
512 c->reconf_cnt = 1;
513
514 char *saveptr;
515 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
516 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
517 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
518
519 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
520 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
521 continue;
522
523 x = strtok_r(NULL, ",", &saveptr2);
524 if (sscanf(x, "%hhu", &n->prefix) < 1)
525 continue;
526
527 x = strtok_r(NULL, ",", &saveptr2);
528 if (sscanf(x, "%u", &n->preferred) < 1)
529 continue;
530
531 x = strtok_r(NULL, ",", &saveptr2);
532 if (sscanf(x, "%u", &n->valid) < 1)
533 continue;
534
535 if (n->preferred > n->valid)
536 continue;
537
538 if (UINT32_MAX - now < n->preferred)
539 n->preferred = UINT32_MAX;
540 else
541 n->preferred += now;
542
543 if (UINT32_MAX - now < n->valid)
544 n->valid = UINT32_MAX;
545 else
546 n->valid += now;
547
548 n->dprefix = 0;
549
550 ++c->managed_size;
551 }
552
553 ustream_consume(s, end - data);
554 }
555
556 if (first && c->managed_size == 0)
557 free_dhcpv6_assignment(c);
558 else if (first && !(c->flags & OAF_STATIC))
559 c->valid_until = now + 150;
560 }
561
562
563 /* TCP transmission has ended, either because of success or timeout or other error */
564 static void managed_handle_pd_done(struct ustream *s)
565 {
566 struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock);
567
568 if (!(c->flags & OAF_STATIC))
569 c->valid_until = odhcpd_time() + 15;
570
571 c->managed_size = 0;
572
573 if (c->accept_reconf)
574 c->reconf_cnt = 1;
575 }
576
577 static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign)
578 {
579 struct dhcpv6_assignment *c;
580
581 if (iface->dhcpv6_pd_manager[0]) {
582 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
583 if (fd >= 0) {
584 char iaidbuf[298];
585 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
586
587 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
588 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
589 ustream_fd_init(&assign->managed_sock, fd);
590 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
591 iaidbuf, assign->iaid, assign->length);
592 ustream_write_pending(&assign->managed_sock.stream);
593 assign->managed_size = -1;
594
595 if (!(assign->flags & OAF_STATIC))
596 assign->valid_until = odhcpd_time() + 15;
597
598 list_add(&assign->head, &iface->ia_assignments);
599
600 /* Wait initial period of up to 250ms for immediate assignment */
601 struct pollfd pfd = { .fd = fd, .events = POLLIN };
602 poll(&pfd, 1, 250);
603 managed_handle_pd_data(&assign->managed_sock.stream, 0);
604
605 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
606 return true;
607 }
608
609 return false;
610 } else if (iface->addr6_len < 1)
611 return false;
612
613 /* Try honoring the hint first */
614 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
615 if (assign->assigned) {
616 list_for_each_entry(c, &iface->ia_assignments, head) {
617 if (c->length == 128 || c->length == 0)
618 continue;
619
620 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
621 list_add_tail(&assign->head, &c->head);
622
623 if (assign->flags & OAF_BOUND)
624 apply_lease(iface, assign, true);
625
626 return true;
627 }
628
629 if (c->assigned != 0)
630 current = (c->assigned + (1 << (64 - c->length)));
631 }
632 }
633
634 /* Fallback to a variable assignment */
635 current = 1;
636 list_for_each_entry(c, &iface->ia_assignments, head) {
637 if (c->length == 128 || c->length == 0)
638 continue;
639
640 current = (current + asize) & (~asize);
641 if (current + asize < c->assigned) {
642 assign->assigned = current;
643 list_add_tail(&assign->head, &c->head);
644
645 if (assign->flags & OAF_BOUND)
646 apply_lease(iface, assign, true);
647
648 return true;
649 }
650
651 if (c->assigned != 0)
652 current = (c->assigned + (1 << (64 - c->length)));
653 }
654
655 return false;
656 }
657
658 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
659 {
660 /* Seed RNG with checksum of DUID */
661 uint32_t seed = 0;
662 for (size_t i = 0; i < assign->clid_len; ++i)
663 seed += assign->clid_data[i];
664 srand(seed);
665
666 /* Try to assign up to 100x */
667 for (size_t i = 0; i < 100; ++i) {
668 uint32_t try;
669 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
670
671 struct dhcpv6_assignment *c;
672 list_for_each_entry(c, &iface->ia_assignments, head) {
673 if (c->length == 0)
674 continue;
675
676 if (c->assigned > try || c->length != 128) {
677 assign->assigned = try;
678 list_add_tail(&assign->head, &c->head);
679 return true;
680 } else if (c->assigned == try)
681 break;
682 }
683 }
684
685 return false;
686 }
687
688 static void handle_addrlist_change(struct netevent_handler_info *info)
689 {
690 struct interface *iface = info->iface;
691 struct dhcpv6_assignment *c, *d, *border = list_last_entry(
692 &iface->ia_assignments, struct dhcpv6_assignment, head);
693 time_t now = odhcpd_time();
694 int minprefix = -1;
695
696 list_for_each_entry(c, &iface->ia_assignments, head)
697 if (c != border && iface->ra_managed == RA_MANAGED_NO_MFLAG
698 && (c->flags & OAF_BOUND))
699 __apply_lease(iface, c, info->addrs_old.addrs,
700 info->addrs_old.len, false);
701
702 for (size_t i = 0; i < iface->addr6_len; ++i) {
703 if (iface->addr6[i].preferred > (uint32_t)now &&
704 iface->addr6[i].prefix < 64 &&
705 iface->addr6[i].prefix > minprefix)
706 minprefix = iface->addr6[i].prefix;
707 }
708
709 if (minprefix > 32 && minprefix <= 64)
710 border->assigned = 1U << (64 - minprefix);
711 else
712 border->assigned = 0;
713
714 struct list_head reassign = LIST_HEAD_INIT(reassign);
715 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
716 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
717 c->managed_size)
718 continue;
719
720 if (c->length < 128 && c->assigned >= border->assigned && c != border)
721 list_move(&c->head, &reassign);
722 else if (c != border && (c->flags & OAF_BOUND))
723 apply_lease(iface, c, true);
724
725 if (c->accept_reconf && c->reconf_cnt == 0) {
726 start_reconf(c);
727
728 /* Leave all other assignments of that client alone */
729 struct dhcpv6_assignment *a;
730 list_for_each_entry(a, &iface->ia_assignments, head)
731 if (a != c && a->clid_len == c->clid_len &&
732 !memcmp(a->clid_data, c->clid_data, a->clid_len))
733 a->reconf_cnt = INT_MAX;
734 }
735 }
736
737 while (!list_empty(&reassign)) {
738 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
739 list_del(&c->head);
740 if (!assign_pd(iface, c)) {
741 c->assigned = 0;
742 list_add(&c->head, &iface->ia_assignments);
743 }
744 }
745
746 dhcpv6_write_statefile();
747 }
748
749 static void reconf_timeout_cb(struct uloop_timeout *event)
750 {
751 struct dhcpv6_assignment *a = container_of(event, struct dhcpv6_assignment, reconf_timer);
752
753 if (a->reconf_cnt > 0 && a->reconf_cnt < DHCPV6_REC_MAX_RC) {
754 send_reconf(a);
755 uloop_timeout_set(&a->reconf_timer,
756 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
757 a->reconf_cnt++;
758 } else
759 stop_reconf(a);
760 }
761
762 static void start_reconf(struct dhcpv6_assignment *a)
763 {
764 uloop_timeout_set(&a->reconf_timer,
765 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
766 a->reconf_timer.cb = reconf_timeout_cb;
767 a->reconf_cnt++;
768
769 send_reconf(a);
770 }
771
772 static void stop_reconf(struct dhcpv6_assignment *a)
773 {
774 uloop_timeout_cancel(&a->reconf_timer);
775 a->reconf_cnt = 0;
776 a->reconf_timer.cb = NULL;
777 }
778
779 static void valid_until_cb(struct uloop_timeout *event)
780 {
781 time_t now = odhcpd_time();
782 struct interface *iface;
783 list_for_each_entry(iface, &interfaces, head) {
784 if (iface->dhcpv6 != MODE_SERVER || iface->ia_assignments.next == NULL)
785 continue;
786
787 struct dhcpv6_assignment *a, *n;
788 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
789 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
790 if ((a->length < 128 && a->clid_len > 0) ||
791 (a->length == 128 && a->clid_len == 0))
792 free_dhcpv6_assignment(a);
793
794 }
795 }
796 }
797 uloop_timeout_set(event, 1000);
798 }
799
800 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
801 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
802 struct interface *iface, bool request)
803 {
804 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
805 return 0;
806
807 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
808 size_t datalen = sizeof(out);
809 time_t now = odhcpd_time();
810
811 if (status) {
812 struct __attribute__((packed)) {
813 uint16_t type;
814 uint16_t len;
815 uint16_t value;
816 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
817 htons(status)};
818
819 memcpy(buf + datalen, &stat, sizeof(stat));
820 datalen += sizeof(stat);
821 } else {
822 if (a) {
823 uint32_t leasetime;
824 if (a->leasetime)
825 leasetime = a->leasetime;
826 else
827 leasetime = iface->dhcpv4_leasetime;
828
829 uint32_t pref = leasetime;
830 uint32_t valid = leasetime;
831
832 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
833 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
834 size_t m = get_preferred_addr(addrs, addrlen);
835
836 for (size_t i = 0; i < addrlen; ++i) {
837 uint32_t prefix_pref = addrs[i].preferred;
838 uint32_t prefix_valid = addrs[i].valid;
839
840 if (!valid_addr(&addrs[i], now))
841 continue;
842
843 if (prefix_pref != UINT32_MAX)
844 prefix_pref -= now;
845
846 if (prefix_valid != UINT32_MAX)
847 prefix_valid -= now;
848
849 if (a->length < 128) {
850 struct dhcpv6_ia_prefix p = {
851 .type = htons(DHCPV6_OPT_IA_PREFIX),
852 .len = htons(sizeof(p) - 4),
853 .preferred = htonl(prefix_pref),
854 .valid = htonl(prefix_valid),
855 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
856 .addr = addrs[i].addr.in6,
857 };
858 p.addr.s6_addr32[1] |= htonl(a->assigned);
859 p.addr.s6_addr32[2] = p.addr.s6_addr32[3] = 0;
860
861 size_t entrlen = sizeof(p) - 4;
862
863 if (datalen + entrlen + 4 > buflen ||
864 (a->assigned == 0 && a->managed_size == 0) ||
865 !valid_prefix_length(a, addrs[i].prefix))
866 continue;
867
868 memcpy(buf + datalen, &p, sizeof(p));
869 datalen += entrlen + 4;
870 } else {
871 struct dhcpv6_ia_addr n = {
872 .type = htons(DHCPV6_OPT_IA_ADDR),
873 .len = htons(sizeof(n) - 4),
874 .addr = addrs[i].addr.in6,
875 .preferred = htonl(prefix_pref),
876 .valid = htonl(prefix_valid)
877 };
878 n.addr.s6_addr32[3] = htonl(a->assigned);
879 size_t entrlen = sizeof(n) - 4;
880
881 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
882 a->assigned == 0 ||
883 datalen + entrlen + 4 > buflen)
884 continue;
885
886 memcpy(buf + datalen, &n, sizeof(n));
887 datalen += entrlen + 4;
888 }
889
890 /* Calculate T1 / T2 based on non-deprecated addresses */
891 if (prefix_pref > 0) {
892 if (prefix_pref < pref)
893 pref = prefix_pref;
894
895 if (prefix_valid < valid)
896 valid = prefix_valid;
897 }
898 }
899
900 if (!INFINITE_VALID(a->valid_until))
901 /* UINT32_MAX is considered as infinite leasetime */
902 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
903
904 out.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
905 out.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
906
907 if (!out.t1)
908 out.t1 = htonl(1);
909
910 if (!out.t2)
911 out.t2 = htonl(1);
912 }
913
914 if (!request) {
915 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
916 uint16_t otype, olen;
917 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
918 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
919 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
920 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
921 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
922 continue;
923
924 bool found = false;
925 if (a) {
926 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
927 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
928
929 for (size_t i = 0; i < addrlen; ++i) {
930 if (!valid_addr(&addrs[i], now))
931 continue;
932
933 struct in6_addr addr = addrs[i].addr.in6;
934 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
935 addr.s6_addr32[1] |= htonl(a->assigned);
936 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
937
938 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
939 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
940 found = true;
941 } else {
942 addr.s6_addr32[3] = htonl(a->assigned);
943
944 if (!memcmp(&n->addr, &addr, sizeof(addr)))
945 found = true;
946 }
947 }
948 }
949
950 if (!found) {
951 if (otype == DHCPV6_OPT_IA_PREFIX) {
952 struct dhcpv6_ia_prefix inv = {
953 .type = htons(DHCPV6_OPT_IA_PREFIX),
954 .len = htons(sizeof(inv) - 4),
955 .preferred = 0,
956 .valid = 0,
957 .prefix = p->prefix,
958 .addr = p->addr
959 };
960
961 if (datalen + sizeof(inv) > buflen)
962 continue;
963
964 memcpy(buf + datalen, &inv, sizeof(inv));
965 datalen += sizeof(inv);
966 } else {
967 struct dhcpv6_ia_addr inv = {
968 .type = htons(DHCPV6_OPT_IA_ADDR),
969 .len = htons(sizeof(inv) - 4),
970 .addr = n->addr,
971 .preferred = 0,
972 .valid = 0
973 };
974
975 if (datalen + sizeof(inv) > buflen)
976 continue;
977
978 memcpy(buf + datalen, &inv, sizeof(inv));
979 datalen += sizeof(inv);
980 }
981 }
982 }
983 }
984 }
985
986 out.len = htons(datalen - 4);
987 memcpy(buf, &out, sizeof(out));
988 return datalen;
989 }
990
991 struct log_ctxt {
992 char *buf;
993 int buf_len;
994 int buf_idx;
995 };
996
997 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
998 _unused uint32_t valid, void *arg)
999 {
1000 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
1001 char addrbuf[INET6_ADDRSTRLEN];
1002
1003 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
1004 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
1005 "%s/%d ", addrbuf, prefix);
1006 }
1007
1008 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
1009 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
1010 {
1011 const char *type = "UNKNOWN";
1012 const char *status = "UNKNOWN";
1013
1014 if (msgtype == DHCPV6_MSG_RENEW)
1015 return;
1016
1017 switch (msgtype) {
1018 case DHCPV6_MSG_SOLICIT:
1019 type = "SOLICIT";
1020 break;
1021 case DHCPV6_MSG_REQUEST:
1022 type = "REQUEST";
1023 break;
1024 case DHCPV6_MSG_CONFIRM:
1025 type = "CONFIRM";
1026 break;
1027 case DHCPV6_MSG_RENEW:
1028 type = "RENEW";
1029 break;
1030 case DHCPV6_MSG_REBIND:
1031 type = "REBIND";
1032 break;
1033 case DHCPV6_MSG_RELEASE:
1034 type = "RELEASE";
1035 break;
1036 case DHCPV6_MSG_DECLINE:
1037 type = "DECLINE";
1038 break;
1039 }
1040
1041 switch (code) {
1042 case DHCPV6_STATUS_OK:
1043 status = "ok";
1044 break;
1045 case DHCPV6_STATUS_NOADDRSAVAIL:
1046 status = "no addresses available";
1047 break;
1048 case DHCPV6_STATUS_NOBINDING:
1049 status = "no binding";
1050 break;
1051 case DHCPV6_STATUS_NOTONLINK:
1052 status = "not on-link";
1053 break;
1054 case DHCPV6_STATUS_NOPREFIXAVAIL:
1055 status = "no prefix available";
1056 break;
1057 }
1058
1059 char leasebuf[256] = "";
1060
1061 if (a) {
1062 struct log_ctxt ctxt = {.buf = leasebuf,
1063 .buf_len = sizeof(leasebuf),
1064 .buf_idx = 0 };
1065
1066 dhcpv6_enum_ia_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1067 }
1068
1069 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1070 duidbuf, iface->ifname, status, leasebuf);
1071 }
1072
1073 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
1074 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1075 {
1076 time_t now = odhcpd_time();
1077 size_t response_len = 0;
1078 const struct dhcpv6_client_header *hdr = data;
1079 uint8_t *start = (uint8_t*)&hdr[1], *odata;
1080 uint16_t otype, olen;
1081 /* Find and parse client-id and hostname */
1082 bool accept_reconf = false;
1083 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1084 char hostname[256];
1085 size_t hostname_len = 0;
1086 bool notonlink = false;
1087 char duidbuf[261];
1088
1089 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1090 if (otype == DHCPV6_OPT_CLIENTID) {
1091 clid_data = odata;
1092 clid_len = olen;
1093
1094 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1095 memcpy(mac, &odata[8], sizeof(mac));
1096 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1097 memcpy(mac, &odata[4], sizeof(mac));
1098
1099 if (olen <= 130)
1100 odhcpd_hexlify(duidbuf, odata, olen);
1101 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1102 uint8_t fqdn_buf[256];
1103 memcpy(fqdn_buf, odata, olen);
1104 fqdn_buf[olen++] = 0;
1105
1106 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1107 hostname_len = strcspn(hostname, ".");
1108 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1109 accept_reconf = true;
1110 }
1111
1112 if (!clid_data || !clid_len || clid_len > 130)
1113 goto out;
1114
1115 struct dhcpv6_assignment *first = NULL;
1116 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1117 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1118 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1119 bool ia_addr_present = false;
1120 if (!is_pd && !is_na)
1121 continue;
1122
1123 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1124 size_t ia_response_len = 0;
1125 uint8_t reqlen = (is_pd) ? 62 : 128;
1126 uint32_t reqhint = 0;
1127
1128 /* Parse request hint for IA-PD */
1129 if (is_pd) {
1130 uint8_t *sdata;
1131 uint16_t stype, slen;
1132 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1133 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1134 continue;
1135
1136 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1137 if (p->prefix) {
1138 reqlen = p->prefix;
1139 reqhint = ntohl(p->addr.s6_addr32[1]);
1140 if (reqlen > 32 && reqlen <= 64)
1141 reqhint &= (1U << (64 - reqlen)) - 1;
1142 }
1143 }
1144
1145 if (reqlen > 64)
1146 reqlen = 64;
1147 } else if (is_na) {
1148 uint8_t *sdata;
1149 uint16_t stype, slen;
1150 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1151 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1152 continue;
1153
1154 ia_addr_present = true;
1155 }
1156 }
1157
1158 /* Find assignment */
1159 struct dhcpv6_assignment *c, *a = NULL;
1160 list_for_each_entry(c, &iface->ia_assignments, head) {
1161 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1162 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1163 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1164 (!(c->flags & (OAF_BOUND|OAF_TENTATIVE)) || c->iaid == ia->iaid) &&
1165 (INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1166 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1167 a = c;
1168
1169 /* Reset state */
1170 if (a->flags & OAF_BOUND)
1171 apply_lease(iface, a, false);
1172
1173 memcpy(a->clid_data, clid_data, clid_len);
1174 a->clid_len = clid_len;
1175 a->iaid = ia->iaid;
1176 a->peer = *addr;
1177 stop_reconf(a);
1178 break;
1179 }
1180 }
1181
1182 /* Generic message handling */
1183 uint16_t status = DHCPV6_STATUS_OK;
1184 if (a && a->managed_size < 0)
1185 return -1;
1186
1187 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1188 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1189 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1190 bool assigned = !!a;
1191
1192 if (!a && !iface->no_dynamic_dhcp) {
1193 /* Create new binding */
1194 a = calloc(1, sizeof(*a) + clid_len);
1195 if (a) {
1196 a->clid_len = clid_len;
1197 a->iaid = ia->iaid;
1198 a->length = reqlen;
1199 a->peer = *addr;
1200 a->assigned = reqhint;
1201 /* Set valid time to current time indicating */
1202 /* assignment is not having infinite lifetime */
1203 a->valid_until = now;
1204 a->iface = iface;
1205
1206 if (first)
1207 memcpy(a->key, first->key, sizeof(a->key));
1208 else
1209 odhcpd_urandom(a->key, sizeof(a->key));
1210 memcpy(a->clid_data, clid_data, clid_len);
1211
1212 if (is_pd)
1213 while (!(assigned = assign_pd(iface, a)) &&
1214 !a->managed_size && ++a->length <= 64);
1215 else
1216 assigned = assign_na(iface, a);
1217
1218 if (a->managed_size && !assigned)
1219 return -1;
1220 }
1221 }
1222
1223 if (!assigned || iface->addr6_len == 0)
1224 /* Set error status */
1225 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1226 else if (accept_reconf && assigned && !first &&
1227 hdr->msg_type != DHCPV6_MSG_REBIND) {
1228 size_t handshake_len = 4;
1229 buf[0] = 0;
1230 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1231 buf[2] = 0;
1232 buf[3] = 0;
1233
1234 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1235 struct dhcpv6_auth_reconfigure auth = {
1236 htons(DHCPV6_OPT_AUTH),
1237 htons(sizeof(auth) - 4),
1238 3, 1, 0,
1239 {htonl(time(NULL)), htonl(++serial)},
1240 1,
1241 {0}
1242 };
1243 memcpy(auth.key, a->key, sizeof(a->key));
1244 memcpy(buf + handshake_len, &auth, sizeof(auth));
1245 handshake_len += sizeof(auth);
1246 }
1247
1248 buf += handshake_len;
1249 buflen -= handshake_len;
1250 response_len += handshake_len;
1251
1252 first = a;
1253 }
1254
1255 ia_response_len = append_reply(buf, buflen, status, ia, a, iface,
1256 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1257
1258 /* Was only a solicitation: mark binding for removal */
1259 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1260 a->flags &= ~OAF_BOUND;
1261 a->flags |= OAF_TENTATIVE;
1262
1263 if (!(a->flags & OAF_STATIC))
1264 /* Keep tentative assignment around for 60 seconds */
1265 a->valid_until = now + 60;
1266 } else if (assigned &&
1267 (hdr->msg_type == DHCPV6_MSG_REQUEST ||
1268 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1269 if (hostname_len > 0) {
1270 a->hostname = realloc(a->hostname, hostname_len + 1);
1271 if (a->hostname) {
1272 memcpy(a->hostname, hostname, hostname_len);
1273 a->hostname[hostname_len] = 0;
1274 }
1275 }
1276 a->accept_reconf = accept_reconf;
1277 a->flags &= ~OAF_TENTATIVE;
1278 a->flags |= OAF_BOUND;
1279 apply_lease(iface, a, true);
1280 } else if (!assigned && a && a->managed_size == 0) {
1281 /* Cleanup failed assignment */
1282 free_dhcpv6_assignment(a);
1283 a = NULL;
1284 }
1285 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1286 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1287 hdr->msg_type == DHCPV6_MSG_REBIND ||
1288 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1289 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1290 status = DHCPV6_STATUS_NOBINDING;
1291 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1292 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1293 hdr->msg_type == DHCPV6_MSG_REBIND) {
1294 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1295 if (a) {
1296 a->flags |= OAF_BOUND;
1297 apply_lease(iface, a, true);
1298 }
1299 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1300 if (!(a->flags & OAF_STATIC))
1301 a->valid_until = now - 1;
1302
1303 if (a->flags & OAF_BOUND) {
1304 apply_lease(iface, a, false);
1305 a->flags &= ~OAF_BOUND;
1306 }
1307 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1308 a->flags &= ~OAF_BOUND;
1309
1310 if (!(a->flags & OAF_STATIC)) {
1311 a->clid_len = 0;
1312 a->valid_until = now + 3600; /* Block address for 1h */
1313 }
1314 }
1315 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1316 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1317 status = DHCPV6_STATUS_NOTONLINK;
1318 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1319 notonlink = true;
1320 }
1321
1322 buf += ia_response_len;
1323 buflen -= ia_response_len;
1324 response_len += ia_response_len;
1325 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1326 }
1327
1328 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1329 response_len + 6 < buflen) {
1330 buf[0] = 0;
1331 buf[1] = DHCPV6_OPT_STATUS;
1332 buf[2] = 0;
1333 buf[3] = 2;
1334 buf[4] = 0;
1335 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1336 response_len += 6;
1337 }
1338
1339 dhcpv6_write_statefile();
1340
1341 out:
1342 return response_len;
1343 }
OpenWrt DHCP Server