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


e48123f2c4b3a6999147b16ecc7ff22eb269b1bb
[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 set_border_assignment_size(struct interface *iface, struct dhcp_assignment *b);
44 static void handle_addrlist_change(struct netevent_handler_info *info);
45 static void start_reconf(struct dhcp_assignment *a);
46 static void stop_reconf(struct dhcp_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_ia_setup_interface(struct interface *iface, bool enable)
64 {
65 enable = enable && (iface->dhcpv6 == MODE_SERVER);
66
67 if (enable) {
68 struct dhcp_assignment *border;
69
70 if (list_empty(&iface->ia_assignments)) {
71 border = alloc_assignment(0);
72
73 if (!border) {
74 syslog(LOG_WARNING, "Failed to alloc border on %s", iface->name);
75 return -1;
76 }
77
78 border->length = 64;
79 list_add(&border->head, &iface->ia_assignments);
80 } else
81 border = list_last_entry(&iface->ia_assignments, struct dhcp_assignment, head);
82
83 set_border_assignment_size(iface, border);
84 } else {
85 struct dhcp_assignment *c;
86
87 while (!list_empty(&iface->ia_assignments)) {
88 c = list_first_entry(&iface->ia_assignments, struct dhcp_assignment, head);
89 free_assignment(c);
90 }
91 }
92
93 return 0;
94 }
95
96
97 static void dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info)
98 {
99 struct interface *iface = info->iface;
100
101 if (!iface || iface->dhcpv6 != MODE_SERVER)
102 return;
103
104 switch (event) {
105 case NETEV_ADDR6LIST_CHANGE:
106 handle_addrlist_change(info);
107 break;
108 default:
109 break;
110 }
111 }
112
113
114 static inline bool valid_prefix_length(const struct dhcp_assignment *a, const uint8_t prefix_length)
115 {
116 return (a->managed_size || a->length > prefix_length);
117 }
118
119 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
120 {
121 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
122 }
123
124 static size_t get_preferred_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
125 {
126 size_t i, m;
127
128 for (i = 0, m = 0; i < addrlen; ++i) {
129 if (addrs[i].preferred > addrs[m].preferred ||
130 (addrs[i].preferred == addrs[m].preferred &&
131 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
132 m = i;
133 }
134
135 return m;
136 }
137
138 static int send_reconf(struct dhcp_assignment *assign)
139 {
140 struct {
141 struct dhcpv6_client_header hdr;
142 uint16_t srvid_type;
143 uint16_t srvid_len;
144 uint16_t duid_type;
145 uint16_t hardware_type;
146 uint8_t mac[6];
147 uint16_t msg_type;
148 uint16_t msg_len;
149 uint8_t msg_id;
150 struct dhcpv6_auth_reconfigure auth;
151 uint16_t clid_type;
152 uint16_t clid_len;
153 uint8_t clid_data[128];
154 } __attribute__((packed)) reconf_msg = {
155 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
156 .srvid_type = htons(DHCPV6_OPT_SERVERID),
157 .srvid_len = htons(10),
158 .duid_type = htons(3),
159 .hardware_type = htons(1),
160 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
161 .msg_len = htons(1),
162 .msg_id = DHCPV6_MSG_RENEW,
163 .auth = {htons(DHCPV6_OPT_AUTH),
164 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
165 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
166 .clid_type = htons(DHCPV6_OPT_CLIENTID),
167 .clid_len = htons(assign->clid_len),
168 .clid_data = {0},
169 };
170 struct interface *iface = assign->iface;
171
172 odhcpd_get_mac(iface, reconf_msg.mac);
173 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
174 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
175
176 md5_ctx_t md5;
177 uint8_t secretbytes[64];
178 memset(secretbytes, 0, sizeof(secretbytes));
179 memcpy(secretbytes, assign->key, sizeof(assign->key));
180
181 for (size_t i = 0; i < sizeof(secretbytes); ++i)
182 secretbytes[i] ^= 0x36;
183
184 md5_begin(&md5);
185 md5_hash(secretbytes, sizeof(secretbytes), &md5);
186 md5_hash(iov.iov_base, iov.iov_len, &md5);
187 md5_end(reconf_msg.auth.key, &md5);
188
189 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
190 secretbytes[i] ^= 0x36;
191 secretbytes[i] ^= 0x5c;
192 }
193
194 md5_begin(&md5);
195 md5_hash(secretbytes, sizeof(secretbytes), &md5);
196 md5_hash(reconf_msg.auth.key, 16, &md5);
197 md5_end(reconf_msg.auth.key, &md5);
198
199 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
200 }
201
202 static void dhcpv6_ia_free_assignment(struct dhcp_assignment *a)
203 {
204 if (a->managed_sock.fd.registered) {
205 ustream_free(&a->managed_sock.stream);
206 close(a->managed_sock.fd.fd);
207 }
208
209 if (a->reconf_cnt)
210 stop_reconf(a);
211
212 free(a->managed);
213 }
214
215 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c,
216 time_t now, dhcpv6_binding_cb_handler_t func, void *arg)
217 {
218 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->addr6;
219 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->addr6_len;
220 size_t m = get_preferred_addr(addrs, addrlen);
221
222 for (size_t i = 0; i < addrlen; ++i) {
223 struct in6_addr addr;
224 uint32_t pref, valid;
225 int prefix = c->managed ? addrs[i].prefix : c->length;
226
227 if (!valid_addr(&addrs[i], now))
228 continue;
229
230 addr = addrs[i].addr.in6;
231 pref = addrs[i].preferred;
232 valid = addrs[i].valid;
233 if (prefix == 128) {
234 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs))
235 continue;
236
237 addr.s6_addr32[3] = htonl(c->assigned);
238 } else {
239 if (!valid_prefix_length(c, addrs[i].prefix))
240 continue;
241
242 addr.s6_addr32[1] |= htonl(c->assigned);
243 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
244 }
245
246 if (pref != UINT32_MAX)
247 pref -= now;
248
249 if (valid != UINT32_MAX)
250 valid -= now;
251
252 func(&addr, prefix, pref, valid, arg);
253 }
254 }
255
256 struct write_ctxt {
257 FILE *fp;
258 md5_ctx_t md5;
259 struct dhcp_assignment *c;
260 struct interface *iface;
261 char *buf;
262 int buf_len;
263 int buf_idx;
264 };
265
266 static void dhcpv6_write_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
267 _unused uint32_t valid, void *arg)
268 {
269 struct write_ctxt *ctxt = (struct write_ctxt *)arg;
270 char ipbuf[INET6_ADDRSTRLEN];
271
272 inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf) - 1);
273
274 if (ctxt->c->length == 128 && ctxt->c->hostname &&
275 !(ctxt->c->flags & OAF_BROKEN_HOSTNAME)) {
276 fputs(ipbuf, ctxt->fp);
277
278 char b[256];
279 if (dn_expand(ctxt->iface->search, ctxt->iface->search + ctxt->iface->search_len,
280 ctxt->iface->search, b, sizeof(b)) > 0)
281 fprintf(ctxt->fp, "\t%s.%s", ctxt->c->hostname, b);
282
283 fprintf(ctxt->fp, "\t%s\n", ctxt->c->hostname);
284 md5_hash(ipbuf, strlen(ipbuf), &ctxt->md5);
285 md5_hash(ctxt->c->hostname, strlen(ctxt->c->hostname), &ctxt->md5);
286 }
287
288 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx,ctxt->buf_len - ctxt->buf_idx,
289 "%s/%d ", ipbuf, prefix);
290 }
291
292 void dhcpv6_ia_write_statefile(void)
293 {
294 struct write_ctxt ctxt;
295
296 md5_begin(&ctxt.md5);
297
298 if (config.dhcp_statefile) {
299 time_t now = odhcpd_time(), wall_time = time(NULL);
300 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
301 char leasebuf[512];
302
303 if (fd < 0)
304 return;
305 int ret;
306 ret = lockf(fd, F_LOCK, 0);
307 if (ret < 0) {
308 close(fd);
309 return;
310 }
311 if (ftruncate(fd, 0) < 0) {}
312
313 ctxt.fp = fdopen(fd, "w");
314 if (!ctxt.fp) {
315 close(fd);
316 return;
317 }
318
319 ctxt.buf = leasebuf;
320 ctxt.buf_len = sizeof(leasebuf);
321
322 avl_for_each_element(&interfaces, ctxt.iface, avl) {
323 if (ctxt.iface->dhcpv6 != MODE_SERVER &&
324 ctxt.iface->dhcpv4 != MODE_SERVER)
325 continue;
326
327 if (ctxt.iface->dhcpv6 == MODE_SERVER) {
328 list_for_each_entry(ctxt.c, &ctxt.iface->ia_assignments, head) {
329 if (!(ctxt.c->flags & OAF_BOUND) || ctxt.c->managed_size < 0)
330 continue;
331
332 char duidbuf[264];
333
334 odhcpd_hexlify(duidbuf, ctxt.c->clid_data, ctxt.c->clid_len);
335
336 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
337 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s %x %s%s %ld %x %u ",
338 ctxt.iface->ifname, duidbuf, ntohl(ctxt.c->iaid),
339 (ctxt.c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
340 (ctxt.c->hostname ? ctxt.c->hostname : "-"),
341 (ctxt.c->valid_until > now ?
342 (ctxt.c->valid_until - now + wall_time) :
343 (INFINITE_VALID(ctxt.c->valid_until) ? -1 : 0)),
344 ctxt.c->assigned, (unsigned)ctxt.c->length);
345
346 if (INFINITE_VALID(ctxt.c->valid_until) || ctxt.c->valid_until > now)
347 dhcpv6_ia_enum_addrs(ctxt.iface, ctxt.c, now,
348 dhcpv6_write_ia_addr, &ctxt);
349
350 ctxt.buf[ctxt.buf_idx - 1] = '\n';
351 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
352 }
353 }
354
355 if (ctxt.iface->dhcpv4 == MODE_SERVER) {
356 struct dhcp_assignment *c;
357
358 list_for_each_entry(c, &ctxt.iface->dhcpv4_assignments, head) {
359 if (!(c->flags & OAF_BOUND))
360 continue;
361
362 char ipbuf[INET6_ADDRSTRLEN];
363 char duidbuf[16];
364 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
365
366 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
367 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s ipv4 %s%s %ld %x 32 ",
368 ctxt.iface->ifname, duidbuf,
369 (c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
370 (c->hostname ? c->hostname : "-"),
371 (c->valid_until > now ?
372 (c->valid_until - now + wall_time) :
373 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
374 ntohl(c->addr));
375
376 struct in_addr addr = {.s_addr = c->addr};
377 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
378
379 if (c->hostname && !(c->flags & OAF_BROKEN_HOSTNAME)) {
380 fputs(ipbuf, ctxt.fp);
381
382 char b[256];
383 if (dn_expand(ctxt.iface->search,
384 ctxt.iface->search + ctxt.iface->search_len,
385 ctxt.iface->search, b, sizeof(b)) > 0)
386 fprintf(ctxt.fp, "\t%s.%s", c->hostname, b);
387
388 fprintf(ctxt.fp, "\t%s\n", c->hostname);
389 md5_hash(ipbuf, strlen(ipbuf), &ctxt.md5);
390 md5_hash(c->hostname, strlen(c->hostname), &ctxt.md5);
391 }
392
393 ctxt.buf_idx += snprintf(ctxt.buf + ctxt.buf_idx,
394 ctxt.buf_len - ctxt.buf_idx,
395 "%s/32 ", ipbuf);
396 ctxt.buf[ctxt.buf_idx - 1] = '\n';
397 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
398 }
399 }
400 }
401
402 fclose(ctxt.fp);
403 }
404
405 uint8_t newmd5[16];
406 md5_end(newmd5, &ctxt.md5);
407
408 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
409 memcpy(statemd5, newmd5, sizeof(statemd5));
410 char *argv[2] = {config.dhcp_cb, NULL};
411 if (!vfork()) {
412 execv(argv[0], argv);
413 _exit(128);
414 }
415 }
416 }
417
418 static void __apply_lease(struct dhcp_assignment *a,
419 struct odhcpd_ipaddr *addrs, ssize_t addr_len, bool add)
420 {
421 if (a->length > 64)
422 return;
423
424 for (ssize_t i = 0; i < addr_len; ++i) {
425 struct in6_addr prefix = addrs[i].addr.in6;
426 prefix.s6_addr32[1] |= htonl(a->assigned);
427 prefix.s6_addr32[2] = prefix.s6_addr32[3] = 0;
428 netlink_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
429 a->iface->ifindex, &a->peer.sin6_addr, 1024, add);
430 }
431 }
432
433 static void apply_lease(struct dhcp_assignment *a, bool add)
434 {
435 struct interface *iface = a->iface;
436 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
437 ssize_t addrlen = (a->managed) ? a->managed_size : (ssize_t)iface->addr6_len;
438
439 __apply_lease(a, addrs, addrlen, add);
440 }
441
442 /* Set border assignment size based on the IPv6 address prefixes */
443 static void set_border_assignment_size(struct interface *iface, struct dhcp_assignment *b)
444 {
445 time_t now = odhcpd_time();
446 int minprefix = -1;
447
448 for (size_t i = 0; i < iface->addr6_len; ++i) {
449 if (iface->addr6[i].preferred > (uint32_t)now &&
450 iface->addr6[i].prefix < 64 &&
451 iface->addr6[i].prefix > minprefix)
452 minprefix = iface->addr6[i].prefix;
453 }
454
455 if (minprefix > 32 && minprefix <= 64)
456 b->assigned = 1U << (64 - minprefix);
457 else
458 b->assigned = 0;
459 }
460
461 /* More data was received from TCP connection */
462 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
463 {
464 struct ustream_fd *fd = container_of(s, struct ustream_fd, stream);
465 struct dhcp_assignment *c = container_of(fd, struct dhcp_assignment, managed_sock);
466 time_t now = odhcpd_time();
467 bool first = c->managed_size < 0;
468
469 for (;;) {
470 int pending;
471 char *data = ustream_get_read_buf(s, &pending);
472 char *end = memmem(data, pending, "\n\n", 2);
473
474 if (!end)
475 break;
476
477 end += 2;
478 end[-1] = 0;
479
480 c->managed_size = 0;
481 if (c->accept_reconf)
482 c->reconf_cnt = 1;
483
484 char *saveptr;
485 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
486 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
487 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
488
489 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
490 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
491 continue;
492
493 x = strtok_r(NULL, ",", &saveptr2);
494 if (sscanf(x, "%hhu", &n->prefix) < 1)
495 continue;
496
497 x = strtok_r(NULL, ",", &saveptr2);
498 if (sscanf(x, "%u", &n->preferred) < 1)
499 continue;
500
501 x = strtok_r(NULL, ",", &saveptr2);
502 if (sscanf(x, "%u", &n->valid) < 1)
503 continue;
504
505 if (n->preferred > n->valid)
506 continue;
507
508 if (UINT32_MAX - now < n->preferred)
509 n->preferred = UINT32_MAX;
510 else
511 n->preferred += now;
512
513 if (UINT32_MAX - now < n->valid)
514 n->valid = UINT32_MAX;
515 else
516 n->valid += now;
517
518 n->dprefix = 0;
519
520 ++c->managed_size;
521 }
522
523 ustream_consume(s, end - data);
524 }
525
526 if (first && c->managed_size == 0)
527 free_assignment(c);
528 else if (first && !(c->flags & OAF_STATIC))
529 c->valid_until = now + 150;
530 }
531
532
533 /* TCP transmission has ended, either because of success or timeout or other error */
534 static void managed_handle_pd_done(struct ustream *s)
535 {
536 struct ustream_fd *fd = container_of(s, struct ustream_fd, stream);
537 struct dhcp_assignment *c = container_of(fd, struct dhcp_assignment, managed_sock);
538
539 if (!(c->flags & OAF_STATIC))
540 c->valid_until = odhcpd_time() + 15;
541
542 c->managed_size = 0;
543
544 if (c->accept_reconf)
545 c->reconf_cnt = 1;
546 }
547
548 static bool assign_pd(struct interface *iface, struct dhcp_assignment *assign)
549 {
550 struct dhcp_assignment *c;
551
552 if (iface->dhcpv6_pd_manager[0]) {
553 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
554 if (fd >= 0) {
555 struct pollfd pfd = { .fd = fd, .events = POLLIN };
556 char iaidbuf[298];
557
558 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
559
560 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
561 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
562 ustream_fd_init(&assign->managed_sock, fd);
563 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
564 iaidbuf, assign->iaid, assign->length);
565 ustream_write_pending(&assign->managed_sock.stream);
566 assign->managed_size = -1;
567
568 if (!(assign->flags & OAF_STATIC))
569 assign->valid_until = odhcpd_time() + 15;
570
571 list_add(&assign->head, &iface->ia_assignments);
572
573 /* Wait initial period of up to 250ms for immediate assignment */
574 if (poll(&pfd, 1, 250) < 0) {
575 syslog(LOG_ERR, "poll(): %m");
576 return false;
577 }
578
579 managed_handle_pd_data(&assign->managed_sock.stream, 0);
580
581 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
582 return true;
583 }
584
585 return false;
586 } else if (iface->addr6_len < 1)
587 return false;
588
589 /* Try honoring the hint first */
590 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
591 if (assign->assigned) {
592 list_for_each_entry(c, &iface->ia_assignments, head) {
593 if (c->length == 128 || c->length == 0)
594 continue;
595
596 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
597 list_add_tail(&assign->head, &c->head);
598
599 if (assign->flags & OAF_BOUND)
600 apply_lease(assign, true);
601
602 return true;
603 }
604
605 if (c->assigned != 0)
606 current = (c->assigned + (1 << (64 - c->length)));
607 }
608 }
609
610 /* Fallback to a variable assignment */
611 current = 1;
612 list_for_each_entry(c, &iface->ia_assignments, head) {
613 if (c->length == 128 || c->length == 0)
614 continue;
615
616 current = (current + asize) & (~asize);
617 if (current + asize < c->assigned) {
618 assign->assigned = current;
619 list_add_tail(&assign->head, &c->head);
620
621 if (assign->flags & OAF_BOUND)
622 apply_lease(assign, true);
623
624 return true;
625 }
626
627 if (c->assigned != 0)
628 current = (c->assigned + (1 << (64 - c->length)));
629 }
630
631 return false;
632 }
633
634 static bool assign_na(struct interface *iface, struct dhcp_assignment *a)
635 {
636 struct dhcp_assignment *c;
637 uint32_t seed = 0;
638
639 /* Preconfigured assignment by static lease */
640 if (a->assigned) {
641 list_for_each_entry(c, &iface->ia_assignments, head) {
642 if (c->length == 0)
643 continue;
644
645 if (c->assigned > a->assigned || c->length != 128) {
646 list_add_tail(&a->head, &c->head);
647 return true;
648 } else if (c->assigned == a->assigned)
649 return false;
650 }
651 }
652
653 /* Seed RNG with checksum of DUID */
654 for (size_t i = 0; i < a->clid_len; ++i)
655 seed += a->clid_data[i];
656 srand(seed);
657
658 /* Try to assign up to 100x */
659 for (size_t i = 0; i < 100; ++i) {
660 uint32_t try;
661 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
662
663 if (config_find_lease_by_hostid(try))
664 continue;
665
666 list_for_each_entry(c, &iface->ia_assignments, head) {
667 if (c->length == 0)
668 continue;
669
670 if (c->assigned > try || c->length != 128) {
671 a->assigned = try;
672 list_add_tail(&a->head, &c->head);
673 return true;
674 } else if (c->assigned == try)
675 break;
676 }
677 }
678
679 return false;
680 }
681
682 static void handle_addrlist_change(struct netevent_handler_info *info)
683 {
684 struct interface *iface = info->iface;
685 struct dhcp_assignment *c, *d, *border = list_last_entry(
686 &iface->ia_assignments, struct dhcp_assignment, head);
687 struct list_head reassign = LIST_HEAD_INIT(reassign);
688 time_t now = odhcpd_time();
689
690 list_for_each_entry(c, &iface->ia_assignments, head) {
691 if (c != border && !(iface->ra_flags & ND_RA_FLAG_MANAGED)
692 && (c->flags & OAF_BOUND))
693 __apply_lease(c, info->addrs_old.addrs,
694 info->addrs_old.len, false);
695 }
696
697 set_border_assignment_size(iface, border);
698
699 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
700 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
701 c->managed_size)
702 continue;
703
704 if (c->length < 128 && (c->assigned == 0 || c->assigned >= border->assigned) && c != border)
705 list_move(&c->head, &reassign);
706 else if (c != border && (c->flags & OAF_BOUND))
707 apply_lease(c, true);
708
709 if (c->accept_reconf && c->reconf_cnt == 0) {
710 struct dhcp_assignment *a;
711
712 start_reconf(c);
713
714 /* Leave all other assignments of that client alone */
715 list_for_each_entry(a, &iface->ia_assignments, head)
716 if (a != c && a->clid_len == c->clid_len &&
717 !memcmp(a->clid_data, c->clid_data, a->clid_len))
718 a->reconf_cnt = INT_MAX;
719 }
720 }
721
722 while (!list_empty(&reassign)) {
723 c = list_first_entry(&reassign, struct dhcp_assignment, head);
724 list_del_init(&c->head);
725 if (!assign_pd(iface, c)) {
726 c->assigned = 0;
727 list_add(&c->head, &iface->ia_assignments);
728 }
729 }
730
731 dhcpv6_ia_write_statefile();
732 }
733
734 static void reconf_timeout_cb(struct uloop_timeout *event)
735 {
736 struct dhcp_assignment *a = container_of(event, struct dhcp_assignment, reconf_timer);
737
738 if (a->reconf_cnt > 0 && a->reconf_cnt < DHCPV6_REC_MAX_RC) {
739 send_reconf(a);
740 uloop_timeout_set(&a->reconf_timer,
741 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
742 a->reconf_cnt++;
743 } else
744 stop_reconf(a);
745 }
746
747 static void start_reconf(struct dhcp_assignment *a)
748 {
749 uloop_timeout_set(&a->reconf_timer,
750 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
751 a->reconf_timer.cb = reconf_timeout_cb;
752 a->reconf_cnt++;
753
754 send_reconf(a);
755 }
756
757 static void stop_reconf(struct dhcp_assignment *a)
758 {
759 uloop_timeout_cancel(&a->reconf_timer);
760 a->reconf_cnt = 0;
761 a->reconf_timer.cb = NULL;
762 }
763
764 static void valid_until_cb(struct uloop_timeout *event)
765 {
766 struct interface *iface;
767 time_t now = odhcpd_time();
768
769 avl_for_each_element(&interfaces, iface, avl) {
770 struct dhcp_assignment *a, *n;
771
772 if (iface->dhcpv6 != MODE_SERVER)
773 continue;
774
775 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
776 if (a->clid_len > 0 && !INFINITE_VALID(a->valid_until) && a->valid_until < now)
777 free_assignment(a);
778 }
779 }
780 uloop_timeout_set(event, 1000);
781 }
782
783 static size_t build_ia(uint8_t *buf, size_t buflen, uint16_t status,
784 const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
785 struct interface *iface, bool request)
786 {
787 struct dhcpv6_ia_hdr o_ia = {
788 .type = ia->type,
789 .len = 0,
790 .iaid = ia->iaid,
791 .t1 = 0,
792 .t2 = 0,
793 };
794 size_t ia_len = sizeof(o_ia);
795 time_t now = odhcpd_time();
796
797 if (buflen < ia_len)
798 return 0;
799
800 if (status) {
801 struct __attribute__((packed)) {
802 uint16_t type;
803 uint16_t len;
804 uint16_t val;
805 } o_status = {
806 .type = htons(DHCPV6_OPT_STATUS),
807 .len = htons(sizeof(o_status) - 4),
808 .val = htons(status),
809 };
810
811 memcpy(buf + ia_len, &o_status, sizeof(o_status));
812 ia_len += sizeof(o_status);
813
814 o_ia.len = htons(ia_len - 4);
815 memcpy(buf, &o_ia, sizeof(o_ia));
816
817 return ia_len;
818 }
819
820 if (a) {
821 uint32_t leasetime;
822
823 if (a->leasetime)
824 leasetime = a->leasetime;
825 else
826 leasetime = iface->dhcpv4_leasetime;
827
828 uint32_t pref = leasetime;
829 uint32_t valid = leasetime;
830
831 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
832 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
833 size_t m = get_preferred_addr(addrs, addrlen);
834
835 for (size_t i = 0; i < addrlen; ++i) {
836 uint32_t prefix_pref = addrs[i].preferred;
837 uint32_t prefix_valid = addrs[i].valid;
838
839 if (!valid_addr(&addrs[i], now))
840 continue;
841
842 if (prefix_pref != UINT32_MAX)
843 prefix_pref -= now;
844
845 if (prefix_valid != UINT32_MAX)
846 prefix_valid -= now;
847
848 if (a->length < 128) {
849 struct dhcpv6_ia_prefix o_ia_p = {
850 .type = htons(DHCPV6_OPT_IA_PREFIX),
851 .len = htons(sizeof(o_ia_p) - 4),
852 .preferred = htonl(prefix_pref),
853 .valid = htonl(prefix_valid),
854 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
855 .addr = addrs[i].addr.in6,
856 };
857
858 o_ia_p.addr.s6_addr32[1] |= htonl(a->assigned);
859 o_ia_p.addr.s6_addr32[2] = o_ia_p.addr.s6_addr32[3] = 0;
860
861 if ((a->assigned == 0 && a->managed_size == 0) ||
862 !valid_prefix_length(a, addrs[i].prefix))
863 continue;
864
865 if (buflen < ia_len + sizeof(o_ia_p))
866 return 0;
867
868 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
869 ia_len += sizeof(o_ia_p);
870 } else {
871 struct dhcpv6_ia_addr o_ia_a = {
872 .type = htons(DHCPV6_OPT_IA_ADDR),
873 .len = htons(sizeof(o_ia_a) - 4),
874 .addr = addrs[i].addr.in6,
875 .preferred = htonl(prefix_pref),
876 .valid = htonl(prefix_valid)
877 };
878
879 o_ia_a.addr.s6_addr32[3] = htonl(a->assigned);
880
881 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
882 a->assigned == 0)
883 continue;
884
885 if (buflen < ia_len + sizeof(o_ia_a))
886 return 0;
887
888 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
889 ia_len += sizeof(o_ia_a);
890 }
891
892 /* Calculate T1 / T2 based on non-deprecated addresses */
893 if (prefix_pref > 0) {
894 if (prefix_pref < pref)
895 pref = prefix_pref;
896
897 if (prefix_valid < valid)
898 valid = prefix_valid;
899 }
900 }
901
902 if (!INFINITE_VALID(a->valid_until))
903 /* UINT32_MAX is considered as infinite leasetime */
904 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
905
906 o_ia.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
907 o_ia.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
908
909 if (!o_ia.t1)
910 o_ia.t1 = htonl(1);
911
912 if (!o_ia.t2)
913 o_ia.t2 = htonl(1);
914 }
915
916 if (!request) {
917 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
918 uint16_t otype, olen;
919
920 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
921 struct dhcpv6_ia_prefix *ia_p = (struct dhcpv6_ia_prefix *)&odata[-4];
922 struct dhcpv6_ia_addr *ia_a = (struct dhcpv6_ia_addr *)&odata[-4];
923 bool found = false;
924
925 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*ia_p) - 4) &&
926 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*ia_a) - 4))
927 continue;
928
929 if (a) {
930 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
931 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
932
933 for (size_t i = 0; i < addrlen; ++i) {
934 if (!valid_addr(&addrs[i], now))
935 continue;
936
937 struct in6_addr addr = addrs[i].addr.in6;
938 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
939 addr.s6_addr32[1] |= htonl(a->assigned);
940 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
941
942 if (!memcmp(&ia_p->addr, &addr, sizeof(addr)) &&
943 ia_p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
944 found = true;
945 } else {
946 addr.s6_addr32[3] = htonl(a->assigned);
947
948 if (!memcmp(&ia_a->addr, &addr, sizeof(addr)))
949 found = true;
950 }
951 }
952 }
953
954 if (!found) {
955 if (otype == DHCPV6_OPT_IA_PREFIX) {
956 struct dhcpv6_ia_prefix o_ia_p = {
957 .type = htons(DHCPV6_OPT_IA_PREFIX),
958 .len = htons(sizeof(o_ia_p) - 4),
959 .preferred = 0,
960 .valid = 0,
961 .prefix = ia_p->prefix,
962 .addr = ia_p->addr,
963 };
964
965 if (buflen < ia_len + sizeof(o_ia_p))
966 return 0;
967
968 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
969 ia_len += sizeof(o_ia_p);
970 } else {
971 struct dhcpv6_ia_addr o_ia_a = {
972 .type = htons(DHCPV6_OPT_IA_ADDR),
973 .len = htons(sizeof(o_ia_a) - 4),
974 .addr = ia_a->addr,
975 .preferred = 0,
976 .valid = 0,
977 };
978
979 if (buflen < ia_len + sizeof(o_ia_a))
980 continue;
981
982 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
983 ia_len += sizeof(o_ia_a);
984 }
985 }
986 }
987 }
988
989 o_ia.len = htons(ia_len - 4);
990 memcpy(buf, &o_ia, sizeof(o_ia));
991 return ia_len;
992 }
993
994 struct log_ctxt {
995 char *buf;
996 int buf_len;
997 int buf_idx;
998 };
999
1000 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
1001 _unused uint32_t valid, void *arg)
1002 {
1003 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
1004 char addrbuf[INET6_ADDRSTRLEN];
1005
1006 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
1007 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
1008 "%s/%d ", addrbuf, prefix);
1009 }
1010
1011 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
1012 const char *duidbuf, bool is_pd, struct dhcp_assignment *a, int code)
1013 {
1014 const char *type = "UNKNOWN";
1015 const char *status = "UNKNOWN";
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_ia_enum_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1067 }
1068
1069 syslog(LOG_INFO, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1070 duidbuf, iface->name, status, leasebuf);
1071 }
1072
1073 static bool dhcpv6_ia_on_link(const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
1074 struct interface *iface)
1075 {
1076 struct odhcpd_ipaddr *addrs = (a && a->managed) ? a->managed : iface->addr6;
1077 size_t addrlen = (a && a->managed) ? (size_t)a->managed_size : iface->addr6_len;
1078 time_t now = odhcpd_time();
1079 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
1080 uint16_t otype, olen;
1081 bool onlink = true;
1082
1083 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
1084 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix *)&odata[-4];
1085 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr *)&odata[-4];
1086
1087 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
1088 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
1089 continue;
1090
1091 onlink = false;
1092 for (size_t i = 0; i < addrlen; ++i) {
1093 if (!valid_addr(&addrs[i], now))
1094 continue;
1095
1096 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
1097 if (p->prefix < addrs[i].prefix ||
1098 odhcpd_bmemcmp(&p->addr, &addrs[i].addr.in6, addrs[i].prefix))
1099 continue;
1100
1101 } else if (odhcpd_bmemcmp(&n->addr, &addrs[i].addr.in6, addrs[i].prefix))
1102 continue;
1103
1104 onlink = true;
1105 }
1106
1107 if (!onlink)
1108 break;
1109 }
1110
1111 return onlink;
1112 }
1113
1114 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
1115 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1116 {
1117 struct lease *l;
1118 struct dhcp_assignment *first = NULL;
1119 const struct dhcpv6_client_header *hdr = data;
1120 time_t now = odhcpd_time();
1121 uint16_t otype, olen, clid_len = 0;
1122 uint8_t *start = (uint8_t *)&hdr[1], *odata;
1123 uint8_t *clid_data = NULL, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1124 size_t hostname_len = 0, response_len = 0;
1125 bool notonlink = false, rapid_commit = false, accept_reconf = false;
1126 char duidbuf[261], hostname[256];
1127
1128 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1129 if (otype == DHCPV6_OPT_CLIENTID) {
1130 clid_data = odata;
1131 clid_len = olen;
1132
1133 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1134 memcpy(mac, &odata[8], sizeof(mac));
1135 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1136 memcpy(mac, &odata[4], sizeof(mac));
1137
1138 if (olen <= 130)
1139 odhcpd_hexlify(duidbuf, odata, olen);
1140 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1141 uint8_t fqdn_buf[256];
1142 memcpy(fqdn_buf, odata, olen);
1143 fqdn_buf[olen++] = 0;
1144
1145 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1146 hostname_len = strcspn(hostname, ".");
1147 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1148 accept_reconf = true;
1149 else if (otype == DHCPV6_OPT_RAPID_COMMIT && hdr->msg_type == DHCPV6_MSG_SOLICIT)
1150 rapid_commit = true;
1151 }
1152
1153 if (!clid_data || !clid_len || clid_len > 130)
1154 goto out;
1155
1156 l = config_find_lease_by_duid(clid_data, clid_len);
1157 if (!l)
1158 l = config_find_lease_by_mac(mac);
1159
1160 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1161 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1162 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1163 bool ia_addr_present = false;
1164 if (!is_pd && !is_na)
1165 continue;
1166
1167 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1168 size_t ia_response_len = 0;
1169 uint8_t reqlen = (is_pd) ? 62 : 128;
1170 uint32_t reqhint = 0;
1171
1172 /* Parse request hint for IA-PD */
1173 if (is_pd) {
1174 uint8_t *sdata;
1175 uint16_t stype, slen;
1176 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1177 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1178 continue;
1179
1180 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1181 if (p->prefix) {
1182 reqlen = p->prefix;
1183 reqhint = ntohl(p->addr.s6_addr32[1]);
1184 if (reqlen > 32 && reqlen <= 64)
1185 reqhint &= (1U << (64 - reqlen)) - 1;
1186 }
1187 }
1188
1189 if (reqlen > 64)
1190 reqlen = 64;
1191 } else if (is_na) {
1192 uint8_t *sdata;
1193 uint16_t stype, slen;
1194 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1195 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1196 continue;
1197
1198 ia_addr_present = true;
1199 }
1200 }
1201
1202 /* Find assignment */
1203 struct dhcp_assignment *c, *a = NULL;
1204 list_for_each_entry(c, &iface->ia_assignments, head) {
1205 if ((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) &&
1206 c->iaid == ia->iaid && (INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1207 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1208 a = c;
1209
1210 /* Reset state */
1211 if (a->flags & OAF_BOUND)
1212 apply_lease(a, false);
1213
1214 stop_reconf(a);
1215 break;
1216 }
1217 }
1218
1219 if (l && a && a->lease != l) {
1220 free_assignment(a);
1221 a = NULL;
1222 }
1223
1224 /* Generic message handling */
1225 uint16_t status = DHCPV6_STATUS_OK;
1226 if (a && a->managed_size < 0)
1227 return -1;
1228
1229 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1230 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1231 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1232 bool assigned = !!a;
1233
1234 if (!a) {
1235 if ((!iface->no_dynamic_dhcp || (l && is_na)) &&
1236 (iface->dhcpv6_pd || iface->dhcpv6_na)) {
1237 /* Create new binding */
1238 a = alloc_assignment(clid_len);
1239
1240 if (a) {
1241 a->clid_len = clid_len;
1242 memcpy(a->clid_data, clid_data, clid_len);
1243 a->iaid = ia->iaid;
1244 a->length = reqlen;
1245 a->peer = *addr;
1246 a->assigned = is_na && l ? l->hostid : reqhint;
1247 /* Set valid time to 0 for static lease indicating */
1248 /* infinite lifetime otherwise current time */
1249 a->valid_until = l ? 0 : now;
1250 a->dhcp_free_cb = dhcpv6_ia_free_assignment;
1251 a->iface = iface;
1252 a->flags = OAF_DHCPV6;
1253
1254 if (first)
1255 memcpy(a->key, first->key, sizeof(a->key));
1256 else
1257 odhcpd_urandom(a->key, sizeof(a->key));
1258
1259 if (is_pd && iface->dhcpv6_pd)
1260 while (!(assigned = assign_pd(iface, a)) &&
1261 !a->managed_size && ++a->length <= 64);
1262 else if (is_na && iface->dhcpv6_na)
1263 assigned = assign_na(iface, a);
1264
1265 if (l && assigned) {
1266 a->flags |= OAF_STATIC;
1267
1268 if (l->hostname)
1269 a->hostname = strdup(l->hostname);
1270
1271 if (l->leasetime)
1272 a->leasetime = l->leasetime;
1273
1274 list_add(&a->lease_list, &l->assignments);
1275 a->lease = l;
1276 }
1277
1278 if (a->managed_size && !assigned)
1279 return -1;
1280 }
1281 }
1282 }
1283
1284 if (!assigned || iface->addr6_len == 0)
1285 /* Set error status */
1286 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1287 else if (hdr->msg_type == DHCPV6_MSG_REQUEST && !dhcpv6_ia_on_link(ia, a, iface)) {
1288 /* Send NOTONLINK staus for the IA */
1289 status = DHCPV6_STATUS_NOTONLINK;
1290 assigned = false;
1291 } else if (accept_reconf && assigned && !first &&
1292 hdr->msg_type != DHCPV6_MSG_REBIND) {
1293 size_t handshake_len = 4;
1294 buf[0] = 0;
1295 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1296 buf[2] = 0;
1297 buf[3] = 0;
1298
1299 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1300 struct dhcpv6_auth_reconfigure auth = {
1301 htons(DHCPV6_OPT_AUTH),
1302 htons(sizeof(auth) - 4),
1303 3, 1, 0,
1304 {htonl(time(NULL)), htonl(++serial)},
1305 1,
1306 {0}
1307 };
1308 memcpy(auth.key, a->key, sizeof(a->key));
1309 memcpy(buf + handshake_len, &auth, sizeof(auth));
1310 handshake_len += sizeof(auth);
1311 }
1312
1313
1314 buf += handshake_len;
1315 buflen -= handshake_len;
1316 response_len += handshake_len;
1317
1318 first = a;
1319 }
1320
1321 ia_response_len = build_ia(buf, buflen, status, ia, a, iface,
1322 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1323
1324 /* Was only a solicitation: mark binding for removal */
1325 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT && !rapid_commit) {
1326 a->flags &= ~OAF_BOUND;
1327 a->flags |= OAF_TENTATIVE;
1328
1329 if (!(a->flags & OAF_STATIC))
1330 /* Keep tentative assignment around for 60 seconds */
1331 a->valid_until = now + 60;
1332
1333 } else if (assigned &&
1334 ((hdr->msg_type == DHCPV6_MSG_SOLICIT && rapid_commit) ||
1335 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1336 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1337 if ((!(a->flags & OAF_STATIC) || !a->hostname) && hostname_len > 0) {
1338 a->hostname = realloc(a->hostname, hostname_len + 1);
1339 if (a->hostname) {
1340 memcpy(a->hostname, hostname, hostname_len);
1341 a->hostname[hostname_len] = 0;
1342
1343 if (odhcpd_valid_hostname(a->hostname))
1344 a->flags &= ~OAF_BROKEN_HOSTNAME;
1345 else
1346 a->flags |= OAF_BROKEN_HOSTNAME;
1347 }
1348 }
1349 a->accept_reconf = accept_reconf;
1350 a->flags &= ~OAF_TENTATIVE;
1351 a->flags |= OAF_BOUND;
1352 apply_lease(a, true);
1353 } else if (!assigned && a && a->managed_size == 0) {
1354 /* Cleanup failed assignment */
1355 free_assignment(a);
1356 a = NULL;
1357 }
1358 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1359 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1360 hdr->msg_type == DHCPV6_MSG_REBIND ||
1361 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1362 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1363 status = DHCPV6_STATUS_NOBINDING;
1364 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1365 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1366 hdr->msg_type == DHCPV6_MSG_REBIND) {
1367 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1368 if (a) {
1369 a->flags |= OAF_BOUND;
1370 apply_lease(a, true);
1371 }
1372 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1373 if (!(a->flags & OAF_STATIC))
1374 a->valid_until = now - 1;
1375
1376 if (a->flags & OAF_BOUND) {
1377 apply_lease(a, false);
1378 a->flags &= ~OAF_BOUND;
1379 }
1380 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1381 a->flags &= ~OAF_BOUND;
1382
1383 if (!(a->flags & OAF_STATIC)) {
1384 memset(a->clid_data, 0, a->clid_len);
1385 a->valid_until = now + 3600; /* Block address for 1h */
1386 }
1387 }
1388 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM) {
1389 if (ia_addr_present && !dhcpv6_ia_on_link(ia, a, iface)) {
1390 notonlink = true;
1391 break;
1392 }
1393
1394 if (!ia_addr_present || !a || !(a->flags & OAF_BOUND)) {
1395 response_len = 0;
1396 goto out;
1397 }
1398 }
1399
1400 buf += ia_response_len;
1401 buflen -= ia_response_len;
1402 response_len += ia_response_len;
1403 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1404 }
1405
1406 switch (hdr->msg_type) {
1407 case DHCPV6_MSG_RELEASE:
1408 case DHCPV6_MSG_DECLINE:
1409 case DHCPV6_MSG_CONFIRM:
1410 if (response_len + 6 < buflen) {
1411 buf[0] = 0;
1412 buf[1] = DHCPV6_OPT_STATUS;
1413 buf[2] = 0;
1414 buf[3] = 2;
1415 buf[4] = 0;
1416 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1417 response_len += 6;
1418 }
1419 break;
1420
1421 default:
1422 break;
1423 }
1424
1425 dhcpv6_ia_write_statefile();
1426
1427 out:
1428 return response_len;
1429 }
OpenWrt DHCP Server