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dhcpv6-ia: fix status code for not on link IAs
[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 struct pollfd pfd = { .fd = fd, .events = POLLIN };
585 char iaidbuf[298];
586
587 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
588
589 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
590 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
591 ustream_fd_init(&assign->managed_sock, fd);
592 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
593 iaidbuf, assign->iaid, assign->length);
594 ustream_write_pending(&assign->managed_sock.stream);
595 assign->managed_size = -1;
596
597 if (!(assign->flags & OAF_STATIC))
598 assign->valid_until = odhcpd_time() + 15;
599
600 list_add(&assign->head, &iface->ia_assignments);
601
602 /* Wait initial period of up to 250ms for immediate assignment */
603 if (poll(&pfd, 1, 250) < 0) {
604 syslog(LOG_ERR, "poll(): %m");
605 return false;
606 }
607
608 managed_handle_pd_data(&assign->managed_sock.stream, 0);
609
610 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
611 return true;
612 }
613
614 return false;
615 } else if (iface->addr6_len < 1)
616 return false;
617
618 /* Try honoring the hint first */
619 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
620 if (assign->assigned) {
621 list_for_each_entry(c, &iface->ia_assignments, head) {
622 if (c->length == 128 || c->length == 0)
623 continue;
624
625 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
626 list_add_tail(&assign->head, &c->head);
627
628 if (assign->flags & OAF_BOUND)
629 apply_lease(iface, assign, true);
630
631 return true;
632 }
633
634 if (c->assigned != 0)
635 current = (c->assigned + (1 << (64 - c->length)));
636 }
637 }
638
639 /* Fallback to a variable assignment */
640 current = 1;
641 list_for_each_entry(c, &iface->ia_assignments, head) {
642 if (c->length == 128 || c->length == 0)
643 continue;
644
645 current = (current + asize) & (~asize);
646 if (current + asize < c->assigned) {
647 assign->assigned = current;
648 list_add_tail(&assign->head, &c->head);
649
650 if (assign->flags & OAF_BOUND)
651 apply_lease(iface, assign, true);
652
653 return true;
654 }
655
656 if (c->assigned != 0)
657 current = (c->assigned + (1 << (64 - c->length)));
658 }
659
660 return false;
661 }
662
663 static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign)
664 {
665 /* Seed RNG with checksum of DUID */
666 uint32_t seed = 0;
667 for (size_t i = 0; i < assign->clid_len; ++i)
668 seed += assign->clid_data[i];
669 srand(seed);
670
671 /* Try to assign up to 100x */
672 for (size_t i = 0; i < 100; ++i) {
673 uint32_t try;
674 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
675
676 struct dhcpv6_assignment *c;
677 list_for_each_entry(c, &iface->ia_assignments, head) {
678 if (c->length == 0)
679 continue;
680
681 if (c->assigned > try || c->length != 128) {
682 assign->assigned = try;
683 list_add_tail(&assign->head, &c->head);
684 return true;
685 } else if (c->assigned == try)
686 break;
687 }
688 }
689
690 return false;
691 }
692
693 static void handle_addrlist_change(struct netevent_handler_info *info)
694 {
695 struct interface *iface = info->iface;
696 struct dhcpv6_assignment *c, *d, *border = list_last_entry(
697 &iface->ia_assignments, struct dhcpv6_assignment, head);
698 time_t now = odhcpd_time();
699 int minprefix = -1;
700
701 list_for_each_entry(c, &iface->ia_assignments, head)
702 if (c != border && iface->ra_managed == RA_MANAGED_NO_MFLAG
703 && (c->flags & OAF_BOUND))
704 __apply_lease(iface, c, info->addrs_old.addrs,
705 info->addrs_old.len, false);
706
707 for (size_t i = 0; i < iface->addr6_len; ++i) {
708 if (iface->addr6[i].preferred > (uint32_t)now &&
709 iface->addr6[i].prefix < 64 &&
710 iface->addr6[i].prefix > minprefix)
711 minprefix = iface->addr6[i].prefix;
712 }
713
714 if (minprefix > 32 && minprefix <= 64)
715 border->assigned = 1U << (64 - minprefix);
716 else
717 border->assigned = 0;
718
719 struct list_head reassign = LIST_HEAD_INIT(reassign);
720 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
721 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
722 c->managed_size)
723 continue;
724
725 if (c->length < 128 && c->assigned >= border->assigned && c != border)
726 list_move(&c->head, &reassign);
727 else if (c != border && (c->flags & OAF_BOUND))
728 apply_lease(iface, c, true);
729
730 if (c->accept_reconf && c->reconf_cnt == 0) {
731 start_reconf(c);
732
733 /* Leave all other assignments of that client alone */
734 struct dhcpv6_assignment *a;
735 list_for_each_entry(a, &iface->ia_assignments, head)
736 if (a != c && a->clid_len == c->clid_len &&
737 !memcmp(a->clid_data, c->clid_data, a->clid_len))
738 a->reconf_cnt = INT_MAX;
739 }
740 }
741
742 while (!list_empty(&reassign)) {
743 c = list_first_entry(&reassign, struct dhcpv6_assignment, head);
744 list_del(&c->head);
745 if (!assign_pd(iface, c)) {
746 c->assigned = 0;
747 list_add(&c->head, &iface->ia_assignments);
748 }
749 }
750
751 dhcpv6_write_statefile();
752 }
753
754 static void reconf_timeout_cb(struct uloop_timeout *event)
755 {
756 struct dhcpv6_assignment *a = container_of(event, struct dhcpv6_assignment, reconf_timer);
757
758 if (a->reconf_cnt > 0 && a->reconf_cnt < DHCPV6_REC_MAX_RC) {
759 send_reconf(a);
760 uloop_timeout_set(&a->reconf_timer,
761 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
762 a->reconf_cnt++;
763 } else
764 stop_reconf(a);
765 }
766
767 static void start_reconf(struct dhcpv6_assignment *a)
768 {
769 uloop_timeout_set(&a->reconf_timer,
770 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
771 a->reconf_timer.cb = reconf_timeout_cb;
772 a->reconf_cnt++;
773
774 send_reconf(a);
775 }
776
777 static void stop_reconf(struct dhcpv6_assignment *a)
778 {
779 uloop_timeout_cancel(&a->reconf_timer);
780 a->reconf_cnt = 0;
781 a->reconf_timer.cb = NULL;
782 }
783
784 static void valid_until_cb(struct uloop_timeout *event)
785 {
786 time_t now = odhcpd_time();
787 struct interface *iface;
788 list_for_each_entry(iface, &interfaces, head) {
789 if (iface->dhcpv6 != MODE_SERVER || iface->ia_assignments.next == NULL)
790 continue;
791
792 struct dhcpv6_assignment *a, *n;
793 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
794 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
795 if ((a->length < 128 && a->clid_len > 0) ||
796 (a->length == 128 && a->clid_len == 0))
797 free_dhcpv6_assignment(a);
798
799 }
800 }
801 }
802 uloop_timeout_set(event, 1000);
803 }
804
805 static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
806 const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
807 struct interface *iface, bool request)
808 {
809 if (buflen < sizeof(*ia) + sizeof(struct dhcpv6_ia_prefix))
810 return 0;
811
812 struct dhcpv6_ia_hdr out = {ia->type, 0, ia->iaid, 0, 0};
813 size_t datalen = sizeof(out);
814 time_t now = odhcpd_time();
815
816 if (status) {
817 struct __attribute__((packed)) {
818 uint16_t type;
819 uint16_t len;
820 uint16_t value;
821 } stat = {htons(DHCPV6_OPT_STATUS), htons(sizeof(stat) - 4),
822 htons(status)};
823
824 memcpy(buf + datalen, &stat, sizeof(stat));
825 datalen += sizeof(stat);
826 } else {
827 if (a) {
828 uint32_t leasetime;
829 if (a->leasetime)
830 leasetime = a->leasetime;
831 else
832 leasetime = iface->dhcpv4_leasetime;
833
834 uint32_t pref = leasetime;
835 uint32_t valid = leasetime;
836
837 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
838 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
839 size_t m = get_preferred_addr(addrs, addrlen);
840
841 for (size_t i = 0; i < addrlen; ++i) {
842 uint32_t prefix_pref = addrs[i].preferred;
843 uint32_t prefix_valid = addrs[i].valid;
844
845 if (!valid_addr(&addrs[i], now))
846 continue;
847
848 if (prefix_pref != UINT32_MAX)
849 prefix_pref -= now;
850
851 if (prefix_valid != UINT32_MAX)
852 prefix_valid -= now;
853
854 if (a->length < 128) {
855 struct dhcpv6_ia_prefix p = {
856 .type = htons(DHCPV6_OPT_IA_PREFIX),
857 .len = htons(sizeof(p) - 4),
858 .preferred = htonl(prefix_pref),
859 .valid = htonl(prefix_valid),
860 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
861 .addr = addrs[i].addr.in6,
862 };
863 p.addr.s6_addr32[1] |= htonl(a->assigned);
864 p.addr.s6_addr32[2] = p.addr.s6_addr32[3] = 0;
865
866 size_t entrlen = sizeof(p) - 4;
867
868 if (datalen + entrlen + 4 > buflen ||
869 (a->assigned == 0 && a->managed_size == 0) ||
870 !valid_prefix_length(a, addrs[i].prefix))
871 continue;
872
873 memcpy(buf + datalen, &p, sizeof(p));
874 datalen += entrlen + 4;
875 } else {
876 struct dhcpv6_ia_addr n = {
877 .type = htons(DHCPV6_OPT_IA_ADDR),
878 .len = htons(sizeof(n) - 4),
879 .addr = addrs[i].addr.in6,
880 .preferred = htonl(prefix_pref),
881 .valid = htonl(prefix_valid)
882 };
883 n.addr.s6_addr32[3] = htonl(a->assigned);
884 size_t entrlen = sizeof(n) - 4;
885
886 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
887 a->assigned == 0 ||
888 datalen + entrlen + 4 > buflen)
889 continue;
890
891 memcpy(buf + datalen, &n, sizeof(n));
892 datalen += entrlen + 4;
893 }
894
895 /* Calculate T1 / T2 based on non-deprecated addresses */
896 if (prefix_pref > 0) {
897 if (prefix_pref < pref)
898 pref = prefix_pref;
899
900 if (prefix_valid < valid)
901 valid = prefix_valid;
902 }
903 }
904
905 if (!INFINITE_VALID(a->valid_until))
906 /* UINT32_MAX is considered as infinite leasetime */
907 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
908
909 out.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
910 out.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
911
912 if (!out.t1)
913 out.t1 = htonl(1);
914
915 if (!out.t2)
916 out.t2 = htonl(1);
917 }
918
919 if (!request) {
920 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
921 uint16_t otype, olen;
922
923 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
924 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
925 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
926 bool found = false;
927
928 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
929 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
930 continue;
931
932 if (a) {
933 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
934 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
935
936 for (size_t i = 0; i < addrlen; ++i) {
937 if (!valid_addr(&addrs[i], now))
938 continue;
939
940 struct in6_addr addr = addrs[i].addr.in6;
941 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
942 addr.s6_addr32[1] |= htonl(a->assigned);
943 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
944
945 if (!memcmp(&p->addr, &addr, sizeof(addr)) &&
946 p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
947 found = true;
948 } else {
949 addr.s6_addr32[3] = htonl(a->assigned);
950
951 if (!memcmp(&n->addr, &addr, sizeof(addr)))
952 found = true;
953 }
954 }
955 }
956
957 if (!found) {
958 if (otype == DHCPV6_OPT_IA_PREFIX) {
959 struct dhcpv6_ia_prefix inv = {
960 .type = htons(DHCPV6_OPT_IA_PREFIX),
961 .len = htons(sizeof(inv) - 4),
962 .preferred = 0,
963 .valid = 0,
964 .prefix = p->prefix,
965 .addr = p->addr
966 };
967
968 if (datalen + sizeof(inv) > buflen)
969 continue;
970
971 memcpy(buf + datalen, &inv, sizeof(inv));
972 datalen += sizeof(inv);
973 } else {
974 struct dhcpv6_ia_addr inv = {
975 .type = htons(DHCPV6_OPT_IA_ADDR),
976 .len = htons(sizeof(inv) - 4),
977 .addr = n->addr,
978 .preferred = 0,
979 .valid = 0
980 };
981
982 if (datalen + sizeof(inv) > buflen)
983 continue;
984
985 memcpy(buf + datalen, &inv, sizeof(inv));
986 datalen += sizeof(inv);
987 }
988 }
989 }
990 }
991 }
992
993 out.len = htons(datalen - 4);
994 memcpy(buf, &out, sizeof(out));
995 return datalen;
996 }
997
998 struct log_ctxt {
999 char *buf;
1000 int buf_len;
1001 int buf_idx;
1002 };
1003
1004 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
1005 _unused uint32_t valid, void *arg)
1006 {
1007 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
1008 char addrbuf[INET6_ADDRSTRLEN];
1009
1010 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
1011 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
1012 "%s/%d ", addrbuf, prefix);
1013 }
1014
1015 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
1016 const char *duidbuf, bool is_pd, struct dhcpv6_assignment *a, int code)
1017 {
1018 const char *type = "UNKNOWN";
1019 const char *status = "UNKNOWN";
1020
1021 switch (msgtype) {
1022 case DHCPV6_MSG_SOLICIT:
1023 type = "SOLICIT";
1024 break;
1025 case DHCPV6_MSG_REQUEST:
1026 type = "REQUEST";
1027 break;
1028 case DHCPV6_MSG_CONFIRM:
1029 type = "CONFIRM";
1030 break;
1031 case DHCPV6_MSG_RENEW:
1032 type = "RENEW";
1033 break;
1034 case DHCPV6_MSG_REBIND:
1035 type = "REBIND";
1036 break;
1037 case DHCPV6_MSG_RELEASE:
1038 type = "RELEASE";
1039 break;
1040 case DHCPV6_MSG_DECLINE:
1041 type = "DECLINE";
1042 break;
1043 }
1044
1045 switch (code) {
1046 case DHCPV6_STATUS_OK:
1047 status = "ok";
1048 break;
1049 case DHCPV6_STATUS_NOADDRSAVAIL:
1050 status = "no addresses available";
1051 break;
1052 case DHCPV6_STATUS_NOBINDING:
1053 status = "no binding";
1054 break;
1055 case DHCPV6_STATUS_NOTONLINK:
1056 status = "not on-link";
1057 break;
1058 case DHCPV6_STATUS_NOPREFIXAVAIL:
1059 status = "no prefix available";
1060 break;
1061 }
1062
1063 char leasebuf[256] = "";
1064
1065 if (a) {
1066 struct log_ctxt ctxt = {.buf = leasebuf,
1067 .buf_len = sizeof(leasebuf),
1068 .buf_idx = 0 };
1069
1070 dhcpv6_enum_ia_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1071 }
1072
1073 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1074 duidbuf, iface->ifname, status, leasebuf);
1075 }
1076
1077 static bool dhcpv6_ia_on_link(const struct dhcpv6_ia_hdr *ia, struct dhcpv6_assignment *a,
1078 struct interface *iface)
1079 {
1080 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
1081 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
1082 time_t now = odhcpd_time();
1083 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
1084 uint16_t otype, olen;
1085 bool onlink = false;
1086
1087 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
1088 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&odata[-4];
1089 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr*)&odata[-4];
1090
1091 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
1092 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
1093 continue;
1094
1095 for (size_t i = 0; i < addrlen; ++i) {
1096 struct in6_addr addr = addrs[i].addr.in6;
1097
1098 if (!valid_addr(&addrs[i], now))
1099 continue;
1100
1101 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
1102 addr.s6_addr32[1] |= htonl(a->assigned);
1103 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
1104
1105 if (memcmp(&p->addr, &addr, sizeof(addr)) ||
1106 p->prefix != ((a->managed) ? addrs[i].prefix : a->length))
1107 continue;
1108 } else {
1109 addr.s6_addr32[3] = htonl(a->assigned);
1110
1111 if (memcmp(&n->addr, &addr, sizeof(addr)))
1112 continue;
1113 }
1114 onlink = true;
1115 }
1116
1117 if (!onlink)
1118 break;
1119 }
1120
1121 return onlink;
1122 }
1123
1124 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
1125 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1126 {
1127 time_t now = odhcpd_time();
1128 size_t response_len = 0;
1129 const struct dhcpv6_client_header *hdr = data;
1130 uint8_t *start = (uint8_t*)&hdr[1], *odata;
1131 uint16_t otype, olen;
1132 /* Find and parse client-id and hostname */
1133 bool accept_reconf = false;
1134 uint8_t *clid_data = NULL, clid_len = 0, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1135 char hostname[256];
1136 size_t hostname_len = 0;
1137 bool notonlink = false;
1138 char duidbuf[261];
1139
1140 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1141 if (otype == DHCPV6_OPT_CLIENTID) {
1142 clid_data = odata;
1143 clid_len = olen;
1144
1145 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1146 memcpy(mac, &odata[8], sizeof(mac));
1147 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1148 memcpy(mac, &odata[4], sizeof(mac));
1149
1150 if (olen <= 130)
1151 odhcpd_hexlify(duidbuf, odata, olen);
1152 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1153 uint8_t fqdn_buf[256];
1154 memcpy(fqdn_buf, odata, olen);
1155 fqdn_buf[olen++] = 0;
1156
1157 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1158 hostname_len = strcspn(hostname, ".");
1159 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1160 accept_reconf = true;
1161 }
1162
1163 if (!clid_data || !clid_len || clid_len > 130)
1164 goto out;
1165
1166 struct dhcpv6_assignment *first = NULL;
1167 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1168 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1169 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1170 bool ia_addr_present = false;
1171 if (!is_pd && !is_na)
1172 continue;
1173
1174 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1175 size_t ia_response_len = 0;
1176 uint8_t reqlen = (is_pd) ? 62 : 128;
1177 uint32_t reqhint = 0;
1178
1179 /* Parse request hint for IA-PD */
1180 if (is_pd) {
1181 uint8_t *sdata;
1182 uint16_t stype, slen;
1183 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1184 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1185 continue;
1186
1187 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1188 if (p->prefix) {
1189 reqlen = p->prefix;
1190 reqhint = ntohl(p->addr.s6_addr32[1]);
1191 if (reqlen > 32 && reqlen <= 64)
1192 reqhint &= (1U << (64 - reqlen)) - 1;
1193 }
1194 }
1195
1196 if (reqlen > 64)
1197 reqlen = 64;
1198 } else if (is_na) {
1199 uint8_t *sdata;
1200 uint16_t stype, slen;
1201 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1202 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1203 continue;
1204
1205 ia_addr_present = true;
1206 }
1207 }
1208
1209 /* Find assignment */
1210 struct dhcpv6_assignment *c, *a = NULL;
1211 list_for_each_entry(c, &iface->ia_assignments, head) {
1212 if (((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) ||
1213 (c->clid_len >= clid_len && !c->clid_data[0] && !c->clid_data[1]
1214 && !memcmp(c->mac, mac, sizeof(mac)))) &&
1215 (!(c->flags & (OAF_BOUND|OAF_TENTATIVE)) || c->iaid == ia->iaid) &&
1216 (INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1217 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1218 a = c;
1219
1220 /* Reset state */
1221 if (a->flags & OAF_BOUND)
1222 apply_lease(iface, a, false);
1223
1224 memcpy(a->clid_data, clid_data, clid_len);
1225 a->clid_len = clid_len;
1226 a->iaid = ia->iaid;
1227 a->peer = *addr;
1228 stop_reconf(a);
1229 break;
1230 }
1231 }
1232
1233 /* Generic message handling */
1234 uint16_t status = DHCPV6_STATUS_OK;
1235 if (a && a->managed_size < 0)
1236 return -1;
1237
1238 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1239 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1240 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1241 bool assigned = !!a;
1242
1243 if (!a && !iface->no_dynamic_dhcp) {
1244 /* Create new binding */
1245 a = calloc(1, sizeof(*a) + clid_len);
1246 if (a) {
1247 a->clid_len = clid_len;
1248 a->iaid = ia->iaid;
1249 a->length = reqlen;
1250 a->peer = *addr;
1251 a->assigned = reqhint;
1252 /* Set valid time to current time indicating */
1253 /* assignment is not having infinite lifetime */
1254 a->valid_until = now;
1255 a->iface = iface;
1256
1257 if (first)
1258 memcpy(a->key, first->key, sizeof(a->key));
1259 else
1260 odhcpd_urandom(a->key, sizeof(a->key));
1261 memcpy(a->clid_data, clid_data, clid_len);
1262
1263 if (is_pd)
1264 while (!(assigned = assign_pd(iface, a)) &&
1265 !a->managed_size && ++a->length <= 64);
1266 else
1267 assigned = assign_na(iface, a);
1268
1269 if (a->managed_size && !assigned)
1270 return -1;
1271 }
1272 }
1273
1274 if (!assigned || iface->addr6_len == 0)
1275 /* Set error status */
1276 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1277 else if (hdr->msg_type == DHCPV6_MSG_REQUEST && !dhcpv6_ia_on_link(ia, a, iface)) {
1278 /* Send NOTONLINK staus for the IA */
1279 status = DHCPV6_STATUS_NOTONLINK;
1280 assigned = false;
1281 } else if (accept_reconf && assigned && !first &&
1282 hdr->msg_type != DHCPV6_MSG_REBIND) {
1283 size_t handshake_len = 4;
1284 buf[0] = 0;
1285 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1286 buf[2] = 0;
1287 buf[3] = 0;
1288
1289 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1290 struct dhcpv6_auth_reconfigure auth = {
1291 htons(DHCPV6_OPT_AUTH),
1292 htons(sizeof(auth) - 4),
1293 3, 1, 0,
1294 {htonl(time(NULL)), htonl(++serial)},
1295 1,
1296 {0}
1297 };
1298 memcpy(auth.key, a->key, sizeof(a->key));
1299 memcpy(buf + handshake_len, &auth, sizeof(auth));
1300 handshake_len += sizeof(auth);
1301 }
1302
1303 buf += handshake_len;
1304 buflen -= handshake_len;
1305 response_len += handshake_len;
1306
1307 first = a;
1308 }
1309
1310 ia_response_len = append_reply(buf, buflen, status, ia, a, iface,
1311 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1312
1313 /* Was only a solicitation: mark binding for removal */
1314 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) {
1315 a->flags &= ~OAF_BOUND;
1316 a->flags |= OAF_TENTATIVE;
1317
1318 if (!(a->flags & OAF_STATIC))
1319 /* Keep tentative assignment around for 60 seconds */
1320 a->valid_until = now + 60;
1321 } else if (assigned &&
1322 (hdr->msg_type == DHCPV6_MSG_REQUEST ||
1323 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1324 if (hostname_len > 0) {
1325 a->hostname = realloc(a->hostname, hostname_len + 1);
1326 if (a->hostname) {
1327 memcpy(a->hostname, hostname, hostname_len);
1328 a->hostname[hostname_len] = 0;
1329 }
1330 }
1331 a->accept_reconf = accept_reconf;
1332 a->flags &= ~OAF_TENTATIVE;
1333 a->flags |= OAF_BOUND;
1334 apply_lease(iface, a, true);
1335 } else if (!assigned && a && a->managed_size == 0) {
1336 /* Cleanup failed assignment */
1337 free_dhcpv6_assignment(a);
1338 a = NULL;
1339 }
1340 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1341 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1342 hdr->msg_type == DHCPV6_MSG_REBIND ||
1343 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1344 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1345 status = DHCPV6_STATUS_NOBINDING;
1346 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1347 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1348 hdr->msg_type == DHCPV6_MSG_REBIND) {
1349 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, false);
1350 if (a) {
1351 a->flags |= OAF_BOUND;
1352 apply_lease(iface, a, true);
1353 }
1354 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1355 if (!(a->flags & OAF_STATIC))
1356 a->valid_until = now - 1;
1357
1358 if (a->flags & OAF_BOUND) {
1359 apply_lease(iface, a, false);
1360 a->flags &= ~OAF_BOUND;
1361 }
1362 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1363 a->flags &= ~OAF_BOUND;
1364
1365 if (!(a->flags & OAF_STATIC)) {
1366 a->clid_len = 0;
1367 a->valid_until = now + 3600; /* Block address for 1h */
1368 }
1369 }
1370 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM && ia_addr_present) {
1371 /* Send NOTONLINK for CONFIRM with addr present so that clients restart connection */
1372 status = DHCPV6_STATUS_NOTONLINK;
1373 ia_response_len = append_reply(buf, buflen, status, ia, a, iface, true);
1374 notonlink = true;
1375 }
1376
1377 buf += ia_response_len;
1378 buflen -= ia_response_len;
1379 response_len += ia_response_len;
1380 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1381 }
1382
1383 if ((hdr->msg_type == DHCPV6_MSG_RELEASE || hdr->msg_type == DHCPV6_MSG_DECLINE || notonlink) &&
1384 response_len + 6 < buflen) {
1385 buf[0] = 0;
1386 buf[1] = DHCPV6_OPT_STATUS;
1387 buf[2] = 0;
1388 buf[3] = 2;
1389 buf[4] = 0;
1390 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1391 response_len += 6;
1392 }
1393
1394 dhcpv6_write_statefile();
1395
1396 out:
1397 return response_len;
1398 }
OpenWrt DHCP Server