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dhcpv6-ia: fix preferred and valid lifetimes in ubus ipv6leases
[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 apply_lease(struct dhcp_assignment *a, bool add);
44 static void set_border_assignment_size(struct interface *iface, struct dhcp_assignment *b);
45 static void handle_addrlist_change(struct netevent_handler_info *info);
46 static void start_reconf(struct dhcp_assignment *a);
47 static void stop_reconf(struct dhcp_assignment *a);
48 static void valid_until_cb(struct uloop_timeout *event);
49
50 static struct netevent_handler dhcpv6_netevent_handler = { .cb = dhcpv6_netevent_cb, };
51 static struct uloop_timeout valid_until_timeout = {.cb = valid_until_cb};
52 static uint32_t serial = 0;
53 static uint8_t statemd5[16];
54
55 int dhcpv6_ia_init(void)
56 {
57 uloop_timeout_set(&valid_until_timeout, 1000);
58
59 netlink_add_netevent_handler(&dhcpv6_netevent_handler);
60
61 return 0;
62 }
63
64 int dhcpv6_ia_setup_interface(struct interface *iface, bool enable)
65 {
66 enable = enable && (iface->dhcpv6 == MODE_SERVER);
67
68 if (enable) {
69 struct dhcp_assignment *border;
70
71 if (list_empty(&iface->ia_assignments)) {
72 border = alloc_assignment(0);
73
74 if (!border) {
75 syslog(LOG_WARNING, "Failed to alloc border on %s", iface->name);
76 return -1;
77 }
78
79 border->length = 64;
80 list_add(&border->head, &iface->ia_assignments);
81 } else
82 border = list_last_entry(&iface->ia_assignments, struct dhcp_assignment, head);
83
84 set_border_assignment_size(iface, border);
85 } else {
86 struct dhcp_assignment *c;
87
88 while (!list_empty(&iface->ia_assignments)) {
89 c = list_first_entry(&iface->ia_assignments, struct dhcp_assignment, head);
90 free_assignment(c);
91 }
92 }
93
94 return 0;
95 }
96
97
98 static void dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info)
99 {
100 struct interface *iface = info->iface;
101
102 if (!iface || iface->dhcpv6 != MODE_SERVER)
103 return;
104
105 switch (event) {
106 case NETEV_ADDR6LIST_CHANGE:
107 handle_addrlist_change(info);
108 break;
109 default:
110 break;
111 }
112 }
113
114
115 static inline bool valid_prefix_length(const struct dhcp_assignment *a, const uint8_t prefix_length)
116 {
117 return (a->managed_size || a->length > prefix_length);
118 }
119
120 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
121 {
122 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
123 }
124
125 static size_t get_preferred_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
126 {
127 size_t i, m;
128
129 for (i = 0, m = 0; i < addrlen; ++i) {
130 if (addrs[i].preferred > addrs[m].preferred ||
131 (addrs[i].preferred == addrs[m].preferred &&
132 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
133 m = i;
134 }
135
136 return m;
137 }
138
139 static int send_reconf(struct dhcp_assignment *assign)
140 {
141 struct {
142 struct dhcpv6_client_header hdr;
143 uint16_t srvid_type;
144 uint16_t srvid_len;
145 uint16_t duid_type;
146 uint16_t hardware_type;
147 uint8_t mac[6];
148 uint16_t msg_type;
149 uint16_t msg_len;
150 uint8_t msg_id;
151 struct dhcpv6_auth_reconfigure auth;
152 uint16_t clid_type;
153 uint16_t clid_len;
154 uint8_t clid_data[128];
155 } __attribute__((packed)) reconf_msg = {
156 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
157 .srvid_type = htons(DHCPV6_OPT_SERVERID),
158 .srvid_len = htons(10),
159 .duid_type = htons(3),
160 .hardware_type = htons(1),
161 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
162 .msg_len = htons(1),
163 .msg_id = DHCPV6_MSG_RENEW,
164 .auth = {htons(DHCPV6_OPT_AUTH),
165 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
166 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
167 .clid_type = htons(DHCPV6_OPT_CLIENTID),
168 .clid_len = htons(assign->clid_len),
169 .clid_data = {0},
170 };
171 struct interface *iface = assign->iface;
172
173 odhcpd_get_mac(iface, reconf_msg.mac);
174 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
175 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
176
177 md5_ctx_t md5;
178 uint8_t secretbytes[64];
179 memset(secretbytes, 0, sizeof(secretbytes));
180 memcpy(secretbytes, assign->key, sizeof(assign->key));
181
182 for (size_t i = 0; i < sizeof(secretbytes); ++i)
183 secretbytes[i] ^= 0x36;
184
185 md5_begin(&md5);
186 md5_hash(secretbytes, sizeof(secretbytes), &md5);
187 md5_hash(iov.iov_base, iov.iov_len, &md5);
188 md5_end(reconf_msg.auth.key, &md5);
189
190 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
191 secretbytes[i] ^= 0x36;
192 secretbytes[i] ^= 0x5c;
193 }
194
195 md5_begin(&md5);
196 md5_hash(secretbytes, sizeof(secretbytes), &md5);
197 md5_hash(reconf_msg.auth.key, 16, &md5);
198 md5_end(reconf_msg.auth.key, &md5);
199
200 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
201 }
202
203 static void dhcpv6_ia_free_assignment(struct dhcp_assignment *a)
204 {
205 if (a->managed_sock.fd.registered) {
206 ustream_free(&a->managed_sock.stream);
207 close(a->managed_sock.fd.fd);
208 }
209
210 if ((a->flags & OAF_BOUND) && (a->flags & OAF_DHCPV6_PD))
211 apply_lease(a, false);
212
213 if (a->reconf_cnt)
214 stop_reconf(a);
215
216 free(a->managed);
217 }
218
219 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c,
220 time_t now, dhcpv6_binding_cb_handler_t func, void *arg)
221 {
222 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->addr6;
223 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->addr6_len;
224 size_t m = get_preferred_addr(addrs, addrlen);
225
226 for (size_t i = 0; i < addrlen; ++i) {
227 struct in6_addr addr;
228 uint32_t pref, valid;
229 int prefix = c->managed ? addrs[i].prefix : c->length;
230
231 if (!valid_addr(&addrs[i], now))
232 continue;
233
234 addr = addrs[i].addr.in6;
235 pref = addrs[i].preferred;
236 valid = addrs[i].valid;
237 if (c->flags & OAF_DHCPV6_NA) {
238 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs))
239 continue;
240
241 addr.s6_addr32[3] = htonl(c->assigned);
242 } else {
243 if (!valid_prefix_length(c, addrs[i].prefix))
244 continue;
245
246 addr.s6_addr32[1] |= htonl(c->assigned);
247 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
248 }
249
250 if (pref > (uint32_t)c->valid_until)
251 pref = c->valid_until;
252
253 if (pref != UINT32_MAX)
254 pref -= now;
255
256 if (valid > (uint32_t)c->valid_until)
257 valid = c->valid_until;
258
259 if (valid != UINT32_MAX)
260 valid -= now;
261
262 func(&addr, prefix, pref, valid, arg);
263 }
264 }
265
266 struct write_ctxt {
267 FILE *fp;
268 md5_ctx_t md5;
269 struct dhcp_assignment *c;
270 struct interface *iface;
271 char *buf;
272 int buf_len;
273 int buf_idx;
274 };
275
276 static void dhcpv6_write_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
277 _unused uint32_t valid, void *arg)
278 {
279 struct write_ctxt *ctxt = (struct write_ctxt *)arg;
280 char ipbuf[INET6_ADDRSTRLEN];
281
282 inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf) - 1);
283
284 if ((ctxt->c->flags & OAF_DHCPV6_NA) && ctxt->c->hostname &&
285 !(ctxt->c->flags & OAF_BROKEN_HOSTNAME)) {
286 fputs(ipbuf, ctxt->fp);
287
288 char b[256];
289 if (dn_expand(ctxt->iface->search, ctxt->iface->search + ctxt->iface->search_len,
290 ctxt->iface->search, b, sizeof(b)) > 0)
291 fprintf(ctxt->fp, "\t%s.%s", ctxt->c->hostname, b);
292
293 fprintf(ctxt->fp, "\t%s\n", ctxt->c->hostname);
294 md5_hash(ipbuf, strlen(ipbuf), &ctxt->md5);
295 md5_hash(ctxt->c->hostname, strlen(ctxt->c->hostname), &ctxt->md5);
296 }
297
298 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx,ctxt->buf_len - ctxt->buf_idx,
299 "%s/%d ", ipbuf, prefix);
300 }
301
302 void dhcpv6_ia_write_statefile(void)
303 {
304 struct write_ctxt ctxt;
305
306 md5_begin(&ctxt.md5);
307
308 if (config.dhcp_statefile) {
309 time_t now = odhcpd_time(), wall_time = time(NULL);
310 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
311 char leasebuf[512];
312
313 if (fd < 0)
314 return;
315 int ret;
316 ret = lockf(fd, F_LOCK, 0);
317 if (ret < 0) {
318 close(fd);
319 return;
320 }
321 if (ftruncate(fd, 0) < 0) {}
322
323 ctxt.fp = fdopen(fd, "w");
324 if (!ctxt.fp) {
325 close(fd);
326 return;
327 }
328
329 ctxt.buf = leasebuf;
330 ctxt.buf_len = sizeof(leasebuf);
331
332 avl_for_each_element(&interfaces, ctxt.iface, avl) {
333 if (ctxt.iface->dhcpv6 != MODE_SERVER &&
334 ctxt.iface->dhcpv4 != MODE_SERVER)
335 continue;
336
337 if (ctxt.iface->dhcpv6 == MODE_SERVER) {
338 list_for_each_entry(ctxt.c, &ctxt.iface->ia_assignments, head) {
339 if (!(ctxt.c->flags & OAF_BOUND) || ctxt.c->managed_size < 0)
340 continue;
341
342 char duidbuf[264];
343
344 odhcpd_hexlify(duidbuf, ctxt.c->clid_data, ctxt.c->clid_len);
345
346 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
347 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s %x %s%s %"PRId64" %x %u ",
348 ctxt.iface->ifname, duidbuf, ntohl(ctxt.c->iaid),
349 (ctxt.c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
350 (ctxt.c->hostname ? ctxt.c->hostname : "-"),
351 (ctxt.c->valid_until > now ?
352 (int64_t)(ctxt.c->valid_until - now + wall_time) :
353 (INFINITE_VALID(ctxt.c->valid_until) ? -1 : 0)),
354 ctxt.c->assigned, (unsigned)ctxt.c->length);
355
356 if (INFINITE_VALID(ctxt.c->valid_until) || ctxt.c->valid_until > now)
357 dhcpv6_ia_enum_addrs(ctxt.iface, ctxt.c, now,
358 dhcpv6_write_ia_addr, &ctxt);
359
360 ctxt.buf[ctxt.buf_idx - 1] = '\n';
361 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
362 }
363 }
364
365 if (ctxt.iface->dhcpv4 == MODE_SERVER) {
366 struct dhcp_assignment *c;
367
368 list_for_each_entry(c, &ctxt.iface->dhcpv4_assignments, head) {
369 if (!(c->flags & OAF_BOUND))
370 continue;
371
372 char ipbuf[INET6_ADDRSTRLEN];
373 char duidbuf[16];
374 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
375
376 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
377 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s ipv4 %s%s %"PRId64" %x 32 ",
378 ctxt.iface->ifname, duidbuf,
379 (c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
380 (c->hostname ? c->hostname : "-"),
381 (c->valid_until > now ?
382 (int64_t)(c->valid_until - now + wall_time) :
383 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
384 ntohl(c->addr));
385
386 struct in_addr addr = {.s_addr = c->addr};
387 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
388
389 if (c->hostname && !(c->flags & OAF_BROKEN_HOSTNAME)) {
390 fputs(ipbuf, ctxt.fp);
391
392 char b[256];
393 if (dn_expand(ctxt.iface->search,
394 ctxt.iface->search + ctxt.iface->search_len,
395 ctxt.iface->search, b, sizeof(b)) > 0)
396 fprintf(ctxt.fp, "\t%s.%s", c->hostname, b);
397
398 fprintf(ctxt.fp, "\t%s\n", c->hostname);
399 md5_hash(ipbuf, strlen(ipbuf), &ctxt.md5);
400 md5_hash(c->hostname, strlen(c->hostname), &ctxt.md5);
401 }
402
403 ctxt.buf_idx += snprintf(ctxt.buf + ctxt.buf_idx,
404 ctxt.buf_len - ctxt.buf_idx,
405 "%s/32 ", ipbuf);
406 ctxt.buf[ctxt.buf_idx - 1] = '\n';
407 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
408 }
409 }
410 }
411
412 fclose(ctxt.fp);
413 }
414
415 uint8_t newmd5[16];
416 md5_end(newmd5, &ctxt.md5);
417
418 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
419 memcpy(statemd5, newmd5, sizeof(statemd5));
420 char *argv[2] = {config.dhcp_cb, NULL};
421 if (!vfork()) {
422 execv(argv[0], argv);
423 _exit(128);
424 }
425 }
426 }
427
428 static void __apply_lease(struct dhcp_assignment *a,
429 struct odhcpd_ipaddr *addrs, ssize_t addr_len, bool add)
430 {
431 if (a->flags & OAF_DHCPV6_NA)
432 return;
433
434 for (ssize_t i = 0; i < addr_len; ++i) {
435 struct in6_addr prefix = addrs[i].addr.in6;
436 prefix.s6_addr32[1] |= htonl(a->assigned);
437 prefix.s6_addr32[2] = prefix.s6_addr32[3] = 0;
438 netlink_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
439 a->iface->ifindex, &a->peer.sin6_addr, 1024, add);
440 }
441 }
442
443 static void apply_lease(struct dhcp_assignment *a, bool add)
444 {
445 struct interface *iface = a->iface;
446 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
447 ssize_t addrlen = (a->managed) ? a->managed_size : (ssize_t)iface->addr6_len;
448
449 __apply_lease(a, addrs, addrlen, add);
450 }
451
452 /* Set border assignment size based on the IPv6 address prefixes */
453 static void set_border_assignment_size(struct interface *iface, struct dhcp_assignment *b)
454 {
455 time_t now = odhcpd_time();
456 int minprefix = -1;
457
458 for (size_t i = 0; i < iface->addr6_len; ++i) {
459 if (iface->addr6[i].preferred > (uint32_t)now &&
460 iface->addr6[i].prefix < 64 &&
461 iface->addr6[i].prefix > minprefix)
462 minprefix = iface->addr6[i].prefix;
463 }
464
465 if (minprefix > 32 && minprefix <= 64)
466 b->assigned = 1U << (64 - minprefix);
467 else
468 b->assigned = 0;
469 }
470
471 /* More data was received from TCP connection */
472 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
473 {
474 struct ustream_fd *fd = container_of(s, struct ustream_fd, stream);
475 struct dhcp_assignment *c = container_of(fd, struct dhcp_assignment, managed_sock);
476 time_t now = odhcpd_time();
477 bool first = c->managed_size < 0;
478
479 for (;;) {
480 int pending;
481 char *data = ustream_get_read_buf(s, &pending);
482 char *end = memmem(data, pending, "\n\n", 2);
483
484 if (!end)
485 break;
486
487 end += 2;
488 end[-1] = 0;
489
490 c->managed_size = 0;
491 if (c->accept_reconf)
492 c->reconf_cnt = 1;
493
494 char *saveptr;
495 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
496 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
497 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
498
499 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
500 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
501 continue;
502
503 x = strtok_r(NULL, ",", &saveptr2);
504 if (sscanf(x, "%hhu", &n->prefix) < 1)
505 continue;
506
507 x = strtok_r(NULL, ",", &saveptr2);
508 if (sscanf(x, "%u", &n->preferred) < 1)
509 continue;
510
511 x = strtok_r(NULL, ",", &saveptr2);
512 if (sscanf(x, "%u", &n->valid) < 1)
513 continue;
514
515 if (n->preferred > n->valid)
516 continue;
517
518 if (UINT32_MAX - now < n->preferred)
519 n->preferred = UINT32_MAX;
520 else
521 n->preferred += now;
522
523 if (UINT32_MAX - now < n->valid)
524 n->valid = UINT32_MAX;
525 else
526 n->valid += now;
527
528 n->dprefix = 0;
529
530 ++c->managed_size;
531 }
532
533 ustream_consume(s, end - data);
534 }
535
536 if (first && c->managed_size == 0)
537 free_assignment(c);
538 else if (first)
539 c->valid_until = now + 150;
540 }
541
542
543 /* TCP transmission has ended, either because of success or timeout or other error */
544 static void managed_handle_pd_done(struct ustream *s)
545 {
546 struct ustream_fd *fd = container_of(s, struct ustream_fd, stream);
547 struct dhcp_assignment *c = container_of(fd, struct dhcp_assignment, managed_sock);
548
549 c->valid_until = odhcpd_time() + 15;
550
551 c->managed_size = 0;
552
553 if (c->accept_reconf)
554 c->reconf_cnt = 1;
555 }
556
557 static bool assign_pd(struct interface *iface, struct dhcp_assignment *assign)
558 {
559 struct dhcp_assignment *c;
560
561 if (iface->dhcpv6_pd_manager[0]) {
562 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
563 if (fd >= 0) {
564 struct pollfd pfd = { .fd = fd, .events = POLLIN };
565 char iaidbuf[298];
566
567 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
568
569 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
570 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
571 ustream_fd_init(&assign->managed_sock, fd);
572 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
573 iaidbuf, assign->iaid, assign->length);
574 ustream_write_pending(&assign->managed_sock.stream);
575 assign->managed_size = -1;
576
577 assign->valid_until = odhcpd_time() + 15;
578
579 list_add(&assign->head, &iface->ia_assignments);
580
581 /* Wait initial period of up to 250ms for immediate assignment */
582 if (poll(&pfd, 1, 250) < 0) {
583 syslog(LOG_ERR, "poll(): %m");
584 return false;
585 }
586
587 managed_handle_pd_data(&assign->managed_sock.stream, 0);
588
589 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
590 return true;
591 }
592
593 return false;
594 } else if (iface->addr6_len < 1)
595 return false;
596
597 /* Try honoring the hint first */
598 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
599 if (assign->assigned) {
600 list_for_each_entry(c, &iface->ia_assignments, head) {
601 if (c->flags & OAF_DHCPV6_NA)
602 continue;
603
604 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
605 list_add_tail(&assign->head, &c->head);
606
607 if (assign->flags & OAF_BOUND)
608 apply_lease(assign, true);
609
610 return true;
611 }
612
613 if (c->assigned != 0)
614 current = (c->assigned + (1 << (64 - c->length)));
615 }
616 }
617
618 /* Fallback to a variable assignment */
619 current = 1;
620 list_for_each_entry(c, &iface->ia_assignments, head) {
621 if (c->flags & OAF_DHCPV6_NA)
622 continue;
623
624 current = (current + asize) & (~asize);
625 if (current + asize < c->assigned) {
626 assign->assigned = current;
627 list_add_tail(&assign->head, &c->head);
628
629 if (assign->flags & OAF_BOUND)
630 apply_lease(assign, true);
631
632 return true;
633 }
634
635 if (c->assigned != 0)
636 current = (c->assigned + (1 << (64 - c->length)));
637 }
638
639 return false;
640 }
641
642 static bool assign_na(struct interface *iface, struct dhcp_assignment *a)
643 {
644 struct dhcp_assignment *c;
645 uint32_t seed = 0;
646
647 /* Preconfigured assignment by static lease */
648 if (a->assigned) {
649 list_for_each_entry(c, &iface->ia_assignments, head) {
650 if (c->assigned > a->assigned || !(c->flags & OAF_DHCPV6_NA)) {
651 list_add_tail(&a->head, &c->head);
652 return true;
653 } else if (c->assigned == a->assigned)
654 return false;
655 }
656 }
657
658 /* Seed RNG with checksum of DUID */
659 for (size_t i = 0; i < a->clid_len; ++i)
660 seed += a->clid_data[i];
661 srand(seed);
662
663 /* Try to assign up to 100x */
664 for (size_t i = 0; i < 100; ++i) {
665 uint32_t try;
666 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
667
668 if (config_find_lease_by_hostid(try))
669 continue;
670
671 list_for_each_entry(c, &iface->ia_assignments, head) {
672 if (c->assigned > try || !(c->flags & OAF_DHCPV6_NA)) {
673 a->assigned = try;
674 list_add_tail(&a->head, &c->head);
675 return true;
676 } else if (c->assigned == try)
677 break;
678 }
679 }
680
681 return false;
682 }
683
684 static void handle_addrlist_change(struct netevent_handler_info *info)
685 {
686 struct interface *iface = info->iface;
687 struct dhcp_assignment *c, *d, *border = list_last_entry(
688 &iface->ia_assignments, struct dhcp_assignment, head);
689 struct list_head reassign = LIST_HEAD_INIT(reassign);
690 time_t now = odhcpd_time();
691
692 list_for_each_entry(c, &iface->ia_assignments, head) {
693 if ((c->flags & OAF_DHCPV6_PD) && !(iface->ra_flags & ND_RA_FLAG_MANAGED)
694 && (c->flags & OAF_BOUND))
695 __apply_lease(c, info->addrs_old.addrs,
696 info->addrs_old.len, false);
697 }
698
699 set_border_assignment_size(iface, border);
700
701 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
702 if (c->clid_len == 0 ||
703 !(c->flags & OAF_DHCPV6_PD) ||
704 (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
705 c->managed_size)
706 continue;
707
708 if (c->assigned == 0 || c->assigned >= border->assigned)
709 list_move(&c->head, &reassign);
710 else if (c->flags & OAF_BOUND)
711 apply_lease(c, true);
712
713 if (c->accept_reconf && c->reconf_cnt == 0) {
714 struct dhcp_assignment *a;
715
716 start_reconf(c);
717
718 /* Leave all other assignments of that client alone */
719 list_for_each_entry(a, &iface->ia_assignments, head)
720 if (a != c && a->clid_len == c->clid_len &&
721 !memcmp(a->clid_data, c->clid_data, a->clid_len))
722 a->reconf_cnt = INT_MAX;
723 }
724 }
725
726 while (!list_empty(&reassign)) {
727 c = list_first_entry(&reassign, struct dhcp_assignment, head);
728 list_del_init(&c->head);
729 if (!assign_pd(iface, c)) {
730 c->assigned = 0;
731 list_add(&c->head, &iface->ia_assignments);
732 }
733 }
734
735 dhcpv6_ia_write_statefile();
736 }
737
738 static void reconf_timeout_cb(struct uloop_timeout *event)
739 {
740 struct dhcp_assignment *a = container_of(event, struct dhcp_assignment, reconf_timer);
741
742 if (a->reconf_cnt > 0 && a->reconf_cnt < DHCPV6_REC_MAX_RC) {
743 send_reconf(a);
744 uloop_timeout_set(&a->reconf_timer,
745 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
746 a->reconf_cnt++;
747 } else
748 stop_reconf(a);
749 }
750
751 static void start_reconf(struct dhcp_assignment *a)
752 {
753 uloop_timeout_set(&a->reconf_timer,
754 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
755 a->reconf_timer.cb = reconf_timeout_cb;
756 a->reconf_cnt++;
757
758 send_reconf(a);
759 }
760
761 static void stop_reconf(struct dhcp_assignment *a)
762 {
763 uloop_timeout_cancel(&a->reconf_timer);
764 a->reconf_cnt = 0;
765 a->reconf_timer.cb = NULL;
766 }
767
768 static void valid_until_cb(struct uloop_timeout *event)
769 {
770 struct interface *iface;
771 time_t now = odhcpd_time();
772
773 avl_for_each_element(&interfaces, iface, avl) {
774 struct dhcp_assignment *a, *n;
775
776 if (iface->dhcpv6 != MODE_SERVER)
777 continue;
778
779 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
780 if (a->clid_len > 0 && !INFINITE_VALID(a->valid_until) && a->valid_until < now)
781 free_assignment(a);
782 }
783 }
784 uloop_timeout_set(event, 1000);
785 }
786
787 static size_t build_ia(uint8_t *buf, size_t buflen, uint16_t status,
788 const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
789 struct interface *iface, bool request)
790 {
791 struct dhcpv6_ia_hdr o_ia = {
792 .type = ia->type,
793 .len = 0,
794 .iaid = ia->iaid,
795 .t1 = 0,
796 .t2 = 0,
797 };
798 size_t ia_len = sizeof(o_ia);
799 time_t now = odhcpd_time();
800
801 if (buflen < ia_len)
802 return 0;
803
804 if (status) {
805 struct __attribute__((packed)) {
806 uint16_t type;
807 uint16_t len;
808 uint16_t val;
809 } o_status = {
810 .type = htons(DHCPV6_OPT_STATUS),
811 .len = htons(sizeof(o_status) - 4),
812 .val = htons(status),
813 };
814
815 memcpy(buf + ia_len, &o_status, sizeof(o_status));
816 ia_len += sizeof(o_status);
817
818 o_ia.len = htons(ia_len - 4);
819 memcpy(buf, &o_ia, sizeof(o_ia));
820
821 return ia_len;
822 }
823
824 if (a) {
825 uint32_t leasetime;
826
827 if (a->leasetime)
828 leasetime = a->leasetime;
829 else
830 leasetime = iface->dhcp_leasetime;
831
832 uint32_t pref = leasetime;
833 uint32_t valid = leasetime;
834
835 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
836 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
837 size_t m = get_preferred_addr(addrs, addrlen);
838
839 for (size_t i = 0; i < addrlen; ++i) {
840 uint32_t prefix_pref = addrs[i].preferred;
841 uint32_t prefix_valid = addrs[i].valid;
842
843 if (!valid_addr(&addrs[i], now))
844 continue;
845
846 if (prefix_pref != UINT32_MAX)
847 prefix_pref -= now;
848
849 if (prefix_pref > leasetime)
850 prefix_pref = leasetime;
851
852 if (prefix_valid != UINT32_MAX)
853 prefix_valid -= now;
854
855 if (prefix_valid > leasetime)
856 prefix_valid = leasetime;
857
858 if (a->flags & OAF_DHCPV6_PD) {
859 struct dhcpv6_ia_prefix o_ia_p = {
860 .type = htons(DHCPV6_OPT_IA_PREFIX),
861 .len = htons(sizeof(o_ia_p) - 4),
862 .preferred = htonl(prefix_pref),
863 .valid = htonl(prefix_valid),
864 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
865 .addr = addrs[i].addr.in6,
866 };
867
868 o_ia_p.addr.s6_addr32[1] |= htonl(a->assigned);
869 o_ia_p.addr.s6_addr32[2] = o_ia_p.addr.s6_addr32[3] = 0;
870
871 if ((a->assigned == 0 && a->managed_size == 0) ||
872 !valid_prefix_length(a, addrs[i].prefix))
873 continue;
874
875 if (buflen < ia_len + sizeof(o_ia_p))
876 return 0;
877
878 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
879 ia_len += sizeof(o_ia_p);
880 }
881
882 if (a->flags & OAF_DHCPV6_NA) {
883 struct dhcpv6_ia_addr o_ia_a = {
884 .type = htons(DHCPV6_OPT_IA_ADDR),
885 .len = htons(sizeof(o_ia_a) - 4),
886 .addr = addrs[i].addr.in6,
887 .preferred = htonl(prefix_pref),
888 .valid = htonl(prefix_valid)
889 };
890
891 o_ia_a.addr.s6_addr32[3] = htonl(a->assigned);
892
893 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
894 a->assigned == 0)
895 continue;
896
897 if (buflen < ia_len + sizeof(o_ia_a))
898 return 0;
899
900 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
901 ia_len += sizeof(o_ia_a);
902 }
903
904 /* Calculate T1 / T2 based on non-deprecated addresses */
905 if (prefix_pref > 0) {
906 if (prefix_pref < pref)
907 pref = prefix_pref;
908
909 if (prefix_valid < valid)
910 valid = prefix_valid;
911 }
912 }
913
914 if (!INFINITE_VALID(a->valid_until))
915 /* UINT32_MAX is considered as infinite leasetime */
916 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
917
918 o_ia.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
919 o_ia.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
920
921 if (!o_ia.t1)
922 o_ia.t1 = htonl(1);
923
924 if (!o_ia.t2)
925 o_ia.t2 = htonl(1);
926 }
927
928 if (!request) {
929 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
930 uint16_t otype, olen;
931
932 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
933 struct dhcpv6_ia_prefix *ia_p = (struct dhcpv6_ia_prefix *)&odata[-4];
934 struct dhcpv6_ia_addr *ia_a = (struct dhcpv6_ia_addr *)&odata[-4];
935 bool found = false;
936
937 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*ia_p) - 4) &&
938 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*ia_a) - 4))
939 continue;
940
941 if (a) {
942 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
943 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
944
945 for (size_t i = 0; i < addrlen; ++i) {
946 if (!valid_addr(&addrs[i], now))
947 continue;
948
949 struct in6_addr addr = addrs[i].addr.in6;
950 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
951 addr.s6_addr32[1] |= htonl(a->assigned);
952 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
953
954 if (!memcmp(&ia_p->addr, &addr, sizeof(addr)) &&
955 ia_p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
956 found = true;
957 } else {
958 addr.s6_addr32[3] = htonl(a->assigned);
959
960 if (!memcmp(&ia_a->addr, &addr, sizeof(addr)))
961 found = true;
962 }
963 }
964 }
965
966 if (!found) {
967 if (otype == DHCPV6_OPT_IA_PREFIX) {
968 struct dhcpv6_ia_prefix o_ia_p = {
969 .type = htons(DHCPV6_OPT_IA_PREFIX),
970 .len = htons(sizeof(o_ia_p) - 4),
971 .preferred = 0,
972 .valid = 0,
973 .prefix = ia_p->prefix,
974 .addr = ia_p->addr,
975 };
976
977 if (buflen < ia_len + sizeof(o_ia_p))
978 return 0;
979
980 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
981 ia_len += sizeof(o_ia_p);
982 } else {
983 struct dhcpv6_ia_addr o_ia_a = {
984 .type = htons(DHCPV6_OPT_IA_ADDR),
985 .len = htons(sizeof(o_ia_a) - 4),
986 .addr = ia_a->addr,
987 .preferred = 0,
988 .valid = 0,
989 };
990
991 if (buflen < ia_len + sizeof(o_ia_a))
992 continue;
993
994 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
995 ia_len += sizeof(o_ia_a);
996 }
997 }
998 }
999 }
1000
1001 o_ia.len = htons(ia_len - 4);
1002 memcpy(buf, &o_ia, sizeof(o_ia));
1003 return ia_len;
1004 }
1005
1006 struct log_ctxt {
1007 char *buf;
1008 int buf_len;
1009 int buf_idx;
1010 };
1011
1012 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
1013 _unused uint32_t valid, void *arg)
1014 {
1015 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
1016 char addrbuf[INET6_ADDRSTRLEN];
1017
1018 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
1019 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
1020 "%s/%d ", addrbuf, prefix);
1021 }
1022
1023 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
1024 const char *duidbuf, bool is_pd, struct dhcp_assignment *a, int code)
1025 {
1026 const char *type = "UNKNOWN";
1027 const char *status = "UNKNOWN";
1028
1029 switch (msgtype) {
1030 case DHCPV6_MSG_SOLICIT:
1031 type = "SOLICIT";
1032 break;
1033 case DHCPV6_MSG_REQUEST:
1034 type = "REQUEST";
1035 break;
1036 case DHCPV6_MSG_CONFIRM:
1037 type = "CONFIRM";
1038 break;
1039 case DHCPV6_MSG_RENEW:
1040 type = "RENEW";
1041 break;
1042 case DHCPV6_MSG_REBIND:
1043 type = "REBIND";
1044 break;
1045 case DHCPV6_MSG_RELEASE:
1046 type = "RELEASE";
1047 break;
1048 case DHCPV6_MSG_DECLINE:
1049 type = "DECLINE";
1050 break;
1051 }
1052
1053 switch (code) {
1054 case DHCPV6_STATUS_OK:
1055 status = "ok";
1056 break;
1057 case DHCPV6_STATUS_NOADDRSAVAIL:
1058 status = "no addresses available";
1059 break;
1060 case DHCPV6_STATUS_NOBINDING:
1061 status = "no binding";
1062 break;
1063 case DHCPV6_STATUS_NOTONLINK:
1064 status = "not on-link";
1065 break;
1066 case DHCPV6_STATUS_NOPREFIXAVAIL:
1067 status = "no prefix available";
1068 break;
1069 }
1070
1071 char leasebuf[256] = "";
1072
1073 if (a) {
1074 struct log_ctxt ctxt = {.buf = leasebuf,
1075 .buf_len = sizeof(leasebuf),
1076 .buf_idx = 0 };
1077
1078 dhcpv6_ia_enum_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1079 }
1080
1081 syslog(LOG_INFO, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1082 duidbuf, iface->name, status, leasebuf);
1083 }
1084
1085 static bool dhcpv6_ia_on_link(const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
1086 struct interface *iface)
1087 {
1088 struct odhcpd_ipaddr *addrs = (a && a->managed) ? a->managed : iface->addr6;
1089 size_t addrlen = (a && a->managed) ? (size_t)a->managed_size : iface->addr6_len;
1090 time_t now = odhcpd_time();
1091 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
1092 uint16_t otype, olen;
1093 bool onlink = true;
1094
1095 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
1096 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix *)&odata[-4];
1097 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr *)&odata[-4];
1098
1099 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
1100 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
1101 continue;
1102
1103 onlink = false;
1104 for (size_t i = 0; i < addrlen; ++i) {
1105 if (!valid_addr(&addrs[i], now))
1106 continue;
1107
1108 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
1109 if (p->prefix < addrs[i].prefix ||
1110 odhcpd_bmemcmp(&p->addr, &addrs[i].addr.in6, addrs[i].prefix))
1111 continue;
1112
1113 } else if (odhcpd_bmemcmp(&n->addr, &addrs[i].addr.in6, addrs[i].prefix))
1114 continue;
1115
1116 onlink = true;
1117 }
1118
1119 if (!onlink)
1120 break;
1121 }
1122
1123 return onlink;
1124 }
1125
1126 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
1127 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1128 {
1129 struct lease *l;
1130 struct dhcp_assignment *first = NULL;
1131 const struct dhcpv6_client_header *hdr = data;
1132 time_t now = odhcpd_time();
1133 uint16_t otype, olen, clid_len = 0;
1134 uint8_t *start = (uint8_t *)&hdr[1], *odata;
1135 uint8_t *clid_data = NULL, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1136 size_t hostname_len = 0, response_len = 0;
1137 bool notonlink = false, rapid_commit = false, accept_reconf = false;
1138 char duidbuf[261], hostname[256];
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 else if (otype == DHCPV6_OPT_RAPID_COMMIT && hdr->msg_type == DHCPV6_MSG_SOLICIT)
1162 rapid_commit = true;
1163 }
1164
1165 if (!clid_data || !clid_len || clid_len > 130)
1166 goto out;
1167
1168 l = config_find_lease_by_duid(clid_data, clid_len);
1169 if (!l)
1170 l = config_find_lease_by_mac(mac);
1171
1172 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1173 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1174 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1175 bool ia_addr_present = false;
1176 if (!is_pd && !is_na)
1177 continue;
1178
1179 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1180 size_t ia_response_len = 0;
1181 uint8_t reqlen = (is_pd) ? 62 : 128;
1182 uint32_t reqhint = 0;
1183
1184 /* Parse request hint for IA-PD */
1185 if (is_pd) {
1186 uint8_t *sdata;
1187 uint16_t stype, slen;
1188 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1189 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1190 continue;
1191
1192 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1193 if (p->prefix) {
1194 reqlen = p->prefix;
1195 reqhint = ntohl(p->addr.s6_addr32[1]);
1196 if (reqlen > 32 && reqlen <= 64)
1197 reqhint &= (1U << (64 - reqlen)) - 1;
1198 }
1199 }
1200
1201 if (reqlen > 64)
1202 reqlen = 64;
1203 } else if (is_na) {
1204 uint8_t *sdata;
1205 uint16_t stype, slen;
1206 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1207 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1208 continue;
1209
1210 ia_addr_present = true;
1211 }
1212 }
1213
1214 /* Find assignment */
1215 struct dhcp_assignment *c, *a = NULL;
1216 list_for_each_entry(c, &iface->ia_assignments, head) {
1217 if ((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) &&
1218 c->iaid == ia->iaid && (INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1219 ((is_pd && (c->flags & OAF_DHCPV6_PD)) || (is_na && (c->flags & OAF_DHCPV6_NA)))) {
1220 a = c;
1221
1222 /* Reset state */
1223 if (a->flags & OAF_BOUND)
1224 apply_lease(a, false);
1225
1226 stop_reconf(a);
1227 break;
1228 }
1229 }
1230
1231 if (l && a && a->lease != l) {
1232 free_assignment(a);
1233 a = NULL;
1234 }
1235
1236 /* Generic message handling */
1237 uint16_t status = DHCPV6_STATUS_OK;
1238 if (a && a->managed_size < 0)
1239 return -1;
1240
1241 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1242 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1243 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1244 bool assigned = !!a;
1245
1246 if (!a) {
1247 if ((!iface->no_dynamic_dhcp || (l && is_na)) &&
1248 (iface->dhcpv6_pd || iface->dhcpv6_na)) {
1249 /* Create new binding */
1250 a = alloc_assignment(clid_len);
1251
1252 if (a) {
1253 a->clid_len = clid_len;
1254 memcpy(a->clid_data, clid_data, clid_len);
1255 a->iaid = ia->iaid;
1256 a->length = reqlen;
1257 a->peer = *addr;
1258 a->assigned = is_na && l ? l->hostid : reqhint;
1259 a->valid_until = now;
1260 a->dhcp_free_cb = dhcpv6_ia_free_assignment;
1261 a->iface = iface;
1262 a->flags = (is_pd ? OAF_DHCPV6_PD : OAF_DHCPV6_NA);
1263
1264 if (first)
1265 memcpy(a->key, first->key, sizeof(a->key));
1266 else
1267 odhcpd_urandom(a->key, sizeof(a->key));
1268
1269 if (is_pd && iface->dhcpv6_pd)
1270 while (!(assigned = assign_pd(iface, a)) &&
1271 !a->managed_size && ++a->length <= 64);
1272 else if (is_na && iface->dhcpv6_na)
1273 assigned = assign_na(iface, a);
1274
1275 if (l && assigned) {
1276 a->flags |= OAF_STATIC;
1277
1278 if (l->hostname)
1279 a->hostname = strdup(l->hostname);
1280
1281 if (l->leasetime)
1282 a->leasetime = l->leasetime;
1283
1284 list_add(&a->lease_list, &l->assignments);
1285 a->lease = l;
1286 }
1287
1288 if (a->managed_size && !assigned)
1289 return -1;
1290 }
1291 }
1292 }
1293
1294 if (!assigned || iface->addr6_len == 0)
1295 /* Set error status */
1296 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1297 else if (hdr->msg_type == DHCPV6_MSG_REQUEST && !dhcpv6_ia_on_link(ia, a, iface)) {
1298 /* Send NOTONLINK staus for the IA */
1299 status = DHCPV6_STATUS_NOTONLINK;
1300 assigned = false;
1301 } else if (accept_reconf && assigned && !first &&
1302 hdr->msg_type != DHCPV6_MSG_REBIND) {
1303 size_t handshake_len = 4;
1304 buf[0] = 0;
1305 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1306 buf[2] = 0;
1307 buf[3] = 0;
1308
1309 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1310 struct dhcpv6_auth_reconfigure auth = {
1311 htons(DHCPV6_OPT_AUTH),
1312 htons(sizeof(auth) - 4),
1313 3, 1, 0,
1314 {htonl(time(NULL)), htonl(++serial)},
1315 1,
1316 {0}
1317 };
1318 memcpy(auth.key, a->key, sizeof(a->key));
1319 memcpy(buf + handshake_len, &auth, sizeof(auth));
1320 handshake_len += sizeof(auth);
1321 }
1322
1323
1324 buf += handshake_len;
1325 buflen -= handshake_len;
1326 response_len += handshake_len;
1327
1328 first = a;
1329 }
1330
1331 ia_response_len = build_ia(buf, buflen, status, ia, a, iface,
1332 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1333
1334 /* Was only a solicitation: mark binding for removal */
1335 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT && !rapid_commit) {
1336 a->flags &= ~OAF_BOUND;
1337 a->flags |= OAF_TENTATIVE;
1338
1339 /* Keep tentative assignment around for 60 seconds */
1340 a->valid_until = now + 60;
1341
1342 } else if (assigned &&
1343 ((hdr->msg_type == DHCPV6_MSG_SOLICIT && rapid_commit) ||
1344 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1345 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1346 if ((!(a->flags & OAF_STATIC) || !a->hostname) && hostname_len > 0) {
1347 a->hostname = realloc(a->hostname, hostname_len + 1);
1348 if (a->hostname) {
1349 memcpy(a->hostname, hostname, hostname_len);
1350 a->hostname[hostname_len] = 0;
1351
1352 if (odhcpd_valid_hostname(a->hostname))
1353 a->flags &= ~OAF_BROKEN_HOSTNAME;
1354 else
1355 a->flags |= OAF_BROKEN_HOSTNAME;
1356 }
1357 }
1358 a->accept_reconf = accept_reconf;
1359 a->flags &= ~OAF_TENTATIVE;
1360 a->flags |= OAF_BOUND;
1361 apply_lease(a, true);
1362 } else if (!assigned && a && a->managed_size == 0) {
1363 /* Cleanup failed assignment */
1364 free_assignment(a);
1365 a = NULL;
1366 }
1367 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1368 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1369 hdr->msg_type == DHCPV6_MSG_REBIND ||
1370 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1371 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1372 status = DHCPV6_STATUS_NOBINDING;
1373 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1374 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1375 hdr->msg_type == DHCPV6_MSG_REBIND) {
1376 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1377 if (a) {
1378 a->flags |= OAF_BOUND;
1379 apply_lease(a, true);
1380 }
1381 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1382 a->valid_until = now - 1;
1383 } else if ((a->flags & OAF_DHCPV6_NA) && hdr->msg_type == DHCPV6_MSG_DECLINE) {
1384 a->flags &= ~OAF_BOUND;
1385
1386 if (!(a->flags & OAF_STATIC) || a->lease->hostid != a->assigned) {
1387 memset(a->clid_data, 0, a->clid_len);
1388 a->valid_until = now + 3600; /* Block address for 1h */
1389 } else
1390 a->valid_until = now - 1;
1391 }
1392 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM) {
1393 if (ia_addr_present && !dhcpv6_ia_on_link(ia, a, iface)) {
1394 notonlink = true;
1395 break;
1396 }
1397
1398 if (!ia_addr_present || !a || !(a->flags & OAF_BOUND)) {
1399 response_len = 0;
1400 goto out;
1401 }
1402 }
1403
1404 buf += ia_response_len;
1405 buflen -= ia_response_len;
1406 response_len += ia_response_len;
1407 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1408 }
1409
1410 switch (hdr->msg_type) {
1411 case DHCPV6_MSG_RELEASE:
1412 case DHCPV6_MSG_DECLINE:
1413 case DHCPV6_MSG_CONFIRM:
1414 if (response_len + 6 < buflen) {
1415 buf[0] = 0;
1416 buf[1] = DHCPV6_OPT_STATUS;
1417 buf[2] = 0;
1418 buf[3] = 2;
1419 buf[4] = 0;
1420 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1421 response_len += 6;
1422 }
1423 break;
1424
1425 default:
1426 break;
1427 }
1428
1429 dhcpv6_ia_write_statefile();
1430
1431 out:
1432 return response_len;
1433 }
OpenWrt DHCP Server