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dhcpv6-ia: introduce DHCPv6 pd and ia assignments flags
[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 (prefix == 128) {
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_MAX)
251 pref -= now;
252
253 if (valid != UINT32_MAX)
254 valid -= now;
255
256 func(&addr, prefix, pref, valid, arg);
257 }
258 }
259
260 struct write_ctxt {
261 FILE *fp;
262 md5_ctx_t md5;
263 struct dhcp_assignment *c;
264 struct interface *iface;
265 char *buf;
266 int buf_len;
267 int buf_idx;
268 };
269
270 static void dhcpv6_write_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
271 _unused uint32_t valid, void *arg)
272 {
273 struct write_ctxt *ctxt = (struct write_ctxt *)arg;
274 char ipbuf[INET6_ADDRSTRLEN];
275
276 inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf) - 1);
277
278 if ((ctxt->c->flags & OAF_DHCPV6_NA) && ctxt->c->hostname &&
279 !(ctxt->c->flags & OAF_BROKEN_HOSTNAME)) {
280 fputs(ipbuf, ctxt->fp);
281
282 char b[256];
283 if (dn_expand(ctxt->iface->search, ctxt->iface->search + ctxt->iface->search_len,
284 ctxt->iface->search, b, sizeof(b)) > 0)
285 fprintf(ctxt->fp, "\t%s.%s", ctxt->c->hostname, b);
286
287 fprintf(ctxt->fp, "\t%s\n", ctxt->c->hostname);
288 md5_hash(ipbuf, strlen(ipbuf), &ctxt->md5);
289 md5_hash(ctxt->c->hostname, strlen(ctxt->c->hostname), &ctxt->md5);
290 }
291
292 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx,ctxt->buf_len - ctxt->buf_idx,
293 "%s/%d ", ipbuf, prefix);
294 }
295
296 void dhcpv6_ia_write_statefile(void)
297 {
298 struct write_ctxt ctxt;
299
300 md5_begin(&ctxt.md5);
301
302 if (config.dhcp_statefile) {
303 time_t now = odhcpd_time(), wall_time = time(NULL);
304 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
305 char leasebuf[512];
306
307 if (fd < 0)
308 return;
309 int ret;
310 ret = lockf(fd, F_LOCK, 0);
311 if (ret < 0) {
312 close(fd);
313 return;
314 }
315 if (ftruncate(fd, 0) < 0) {}
316
317 ctxt.fp = fdopen(fd, "w");
318 if (!ctxt.fp) {
319 close(fd);
320 return;
321 }
322
323 ctxt.buf = leasebuf;
324 ctxt.buf_len = sizeof(leasebuf);
325
326 avl_for_each_element(&interfaces, ctxt.iface, avl) {
327 if (ctxt.iface->dhcpv6 != MODE_SERVER &&
328 ctxt.iface->dhcpv4 != MODE_SERVER)
329 continue;
330
331 if (ctxt.iface->dhcpv6 == MODE_SERVER) {
332 list_for_each_entry(ctxt.c, &ctxt.iface->ia_assignments, head) {
333 if (!(ctxt.c->flags & OAF_BOUND) || ctxt.c->managed_size < 0)
334 continue;
335
336 char duidbuf[264];
337
338 odhcpd_hexlify(duidbuf, ctxt.c->clid_data, ctxt.c->clid_len);
339
340 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
341 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s %x %s%s %ld %x %u ",
342 ctxt.iface->ifname, duidbuf, ntohl(ctxt.c->iaid),
343 (ctxt.c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
344 (ctxt.c->hostname ? ctxt.c->hostname : "-"),
345 (ctxt.c->valid_until > now ?
346 (ctxt.c->valid_until - now + wall_time) :
347 (INFINITE_VALID(ctxt.c->valid_until) ? -1 : 0)),
348 ctxt.c->assigned, (unsigned)ctxt.c->length);
349
350 if (INFINITE_VALID(ctxt.c->valid_until) || ctxt.c->valid_until > now)
351 dhcpv6_ia_enum_addrs(ctxt.iface, ctxt.c, now,
352 dhcpv6_write_ia_addr, &ctxt);
353
354 ctxt.buf[ctxt.buf_idx - 1] = '\n';
355 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
356 }
357 }
358
359 if (ctxt.iface->dhcpv4 == MODE_SERVER) {
360 struct dhcp_assignment *c;
361
362 list_for_each_entry(c, &ctxt.iface->dhcpv4_assignments, head) {
363 if (!(c->flags & OAF_BOUND))
364 continue;
365
366 char ipbuf[INET6_ADDRSTRLEN];
367 char duidbuf[16];
368 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
369
370 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
371 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s ipv4 %s%s %ld %x 32 ",
372 ctxt.iface->ifname, duidbuf,
373 (c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
374 (c->hostname ? c->hostname : "-"),
375 (c->valid_until > now ?
376 (c->valid_until - now + wall_time) :
377 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
378 ntohl(c->addr));
379
380 struct in_addr addr = {.s_addr = c->addr};
381 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
382
383 if (c->hostname && !(c->flags & OAF_BROKEN_HOSTNAME)) {
384 fputs(ipbuf, ctxt.fp);
385
386 char b[256];
387 if (dn_expand(ctxt.iface->search,
388 ctxt.iface->search + ctxt.iface->search_len,
389 ctxt.iface->search, b, sizeof(b)) > 0)
390 fprintf(ctxt.fp, "\t%s.%s", c->hostname, b);
391
392 fprintf(ctxt.fp, "\t%s\n", c->hostname);
393 md5_hash(ipbuf, strlen(ipbuf), &ctxt.md5);
394 md5_hash(c->hostname, strlen(c->hostname), &ctxt.md5);
395 }
396
397 ctxt.buf_idx += snprintf(ctxt.buf + ctxt.buf_idx,
398 ctxt.buf_len - ctxt.buf_idx,
399 "%s/32 ", ipbuf);
400 ctxt.buf[ctxt.buf_idx - 1] = '\n';
401 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
402 }
403 }
404 }
405
406 fclose(ctxt.fp);
407 }
408
409 uint8_t newmd5[16];
410 md5_end(newmd5, &ctxt.md5);
411
412 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
413 memcpy(statemd5, newmd5, sizeof(statemd5));
414 char *argv[2] = {config.dhcp_cb, NULL};
415 if (!vfork()) {
416 execv(argv[0], argv);
417 _exit(128);
418 }
419 }
420 }
421
422 static void __apply_lease(struct dhcp_assignment *a,
423 struct odhcpd_ipaddr *addrs, ssize_t addr_len, bool add)
424 {
425 if (a->flags & OAF_DHCPV6_NA)
426 return;
427
428 for (ssize_t i = 0; i < addr_len; ++i) {
429 struct in6_addr prefix = addrs[i].addr.in6;
430 prefix.s6_addr32[1] |= htonl(a->assigned);
431 prefix.s6_addr32[2] = prefix.s6_addr32[3] = 0;
432 netlink_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
433 a->iface->ifindex, &a->peer.sin6_addr, 1024, add);
434 }
435 }
436
437 static void apply_lease(struct dhcp_assignment *a, bool add)
438 {
439 struct interface *iface = a->iface;
440 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
441 ssize_t addrlen = (a->managed) ? a->managed_size : (ssize_t)iface->addr6_len;
442
443 __apply_lease(a, addrs, addrlen, add);
444 }
445
446 /* Set border assignment size based on the IPv6 address prefixes */
447 static void set_border_assignment_size(struct interface *iface, struct dhcp_assignment *b)
448 {
449 time_t now = odhcpd_time();
450 int minprefix = -1;
451
452 for (size_t i = 0; i < iface->addr6_len; ++i) {
453 if (iface->addr6[i].preferred > (uint32_t)now &&
454 iface->addr6[i].prefix < 64 &&
455 iface->addr6[i].prefix > minprefix)
456 minprefix = iface->addr6[i].prefix;
457 }
458
459 if (minprefix > 32 && minprefix <= 64)
460 b->assigned = 1U << (64 - minprefix);
461 else
462 b->assigned = 0;
463 }
464
465 /* More data was received from TCP connection */
466 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
467 {
468 struct ustream_fd *fd = container_of(s, struct ustream_fd, stream);
469 struct dhcp_assignment *c = container_of(fd, struct dhcp_assignment, managed_sock);
470 time_t now = odhcpd_time();
471 bool first = c->managed_size < 0;
472
473 for (;;) {
474 int pending;
475 char *data = ustream_get_read_buf(s, &pending);
476 char *end = memmem(data, pending, "\n\n", 2);
477
478 if (!end)
479 break;
480
481 end += 2;
482 end[-1] = 0;
483
484 c->managed_size = 0;
485 if (c->accept_reconf)
486 c->reconf_cnt = 1;
487
488 char *saveptr;
489 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
490 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
491 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
492
493 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
494 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
495 continue;
496
497 x = strtok_r(NULL, ",", &saveptr2);
498 if (sscanf(x, "%hhu", &n->prefix) < 1)
499 continue;
500
501 x = strtok_r(NULL, ",", &saveptr2);
502 if (sscanf(x, "%u", &n->preferred) < 1)
503 continue;
504
505 x = strtok_r(NULL, ",", &saveptr2);
506 if (sscanf(x, "%u", &n->valid) < 1)
507 continue;
508
509 if (n->preferred > n->valid)
510 continue;
511
512 if (UINT32_MAX - now < n->preferred)
513 n->preferred = UINT32_MAX;
514 else
515 n->preferred += now;
516
517 if (UINT32_MAX - now < n->valid)
518 n->valid = UINT32_MAX;
519 else
520 n->valid += now;
521
522 n->dprefix = 0;
523
524 ++c->managed_size;
525 }
526
527 ustream_consume(s, end - data);
528 }
529
530 if (first && c->managed_size == 0)
531 free_assignment(c);
532 else if (first && !(c->flags & OAF_STATIC))
533 c->valid_until = now + 150;
534 }
535
536
537 /* TCP transmission has ended, either because of success or timeout or other error */
538 static void managed_handle_pd_done(struct ustream *s)
539 {
540 struct ustream_fd *fd = container_of(s, struct ustream_fd, stream);
541 struct dhcp_assignment *c = container_of(fd, struct dhcp_assignment, managed_sock);
542
543 if (!(c->flags & OAF_STATIC))
544 c->valid_until = odhcpd_time() + 15;
545
546 c->managed_size = 0;
547
548 if (c->accept_reconf)
549 c->reconf_cnt = 1;
550 }
551
552 static bool assign_pd(struct interface *iface, struct dhcp_assignment *assign)
553 {
554 struct dhcp_assignment *c;
555
556 if (iface->dhcpv6_pd_manager[0]) {
557 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
558 if (fd >= 0) {
559 struct pollfd pfd = { .fd = fd, .events = POLLIN };
560 char iaidbuf[298];
561
562 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
563
564 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
565 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
566 ustream_fd_init(&assign->managed_sock, fd);
567 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
568 iaidbuf, assign->iaid, assign->length);
569 ustream_write_pending(&assign->managed_sock.stream);
570 assign->managed_size = -1;
571
572 if (!(assign->flags & OAF_STATIC))
573 assign->valid_until = odhcpd_time() + 15;
574
575 list_add(&assign->head, &iface->ia_assignments);
576
577 /* Wait initial period of up to 250ms for immediate assignment */
578 if (poll(&pfd, 1, 250) < 0) {
579 syslog(LOG_ERR, "poll(): %m");
580 return false;
581 }
582
583 managed_handle_pd_data(&assign->managed_sock.stream, 0);
584
585 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
586 return true;
587 }
588
589 return false;
590 } else if (iface->addr6_len < 1)
591 return false;
592
593 /* Try honoring the hint first */
594 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
595 if (assign->assigned) {
596 list_for_each_entry(c, &iface->ia_assignments, head) {
597 if (c->flags & OAF_DHCPV6_NA)
598 continue;
599
600 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
601 list_add_tail(&assign->head, &c->head);
602
603 if (assign->flags & OAF_BOUND)
604 apply_lease(assign, true);
605
606 return true;
607 }
608
609 if (c->assigned != 0)
610 current = (c->assigned + (1 << (64 - c->length)));
611 }
612 }
613
614 /* Fallback to a variable assignment */
615 current = 1;
616 list_for_each_entry(c, &iface->ia_assignments, head) {
617 if (c->flags & OAF_DHCPV6_NA)
618 continue;
619
620 current = (current + asize) & (~asize);
621 if (current + asize < c->assigned) {
622 assign->assigned = current;
623 list_add_tail(&assign->head, &c->head);
624
625 if (assign->flags & OAF_BOUND)
626 apply_lease(assign, true);
627
628 return true;
629 }
630
631 if (c->assigned != 0)
632 current = (c->assigned + (1 << (64 - c->length)));
633 }
634
635 return false;
636 }
637
638 static bool assign_na(struct interface *iface, struct dhcp_assignment *a)
639 {
640 struct dhcp_assignment *c;
641 uint32_t seed = 0;
642
643 /* Preconfigured assignment by static lease */
644 if (a->assigned) {
645 list_for_each_entry(c, &iface->ia_assignments, head) {
646 if (c->assigned > a->assigned || !(c->flags & OAF_DHCPV6_NA)) {
647 list_add_tail(&a->head, &c->head);
648 return true;
649 } else if (c->assigned == a->assigned)
650 return false;
651 }
652 }
653
654 /* Seed RNG with checksum of DUID */
655 for (size_t i = 0; i < a->clid_len; ++i)
656 seed += a->clid_data[i];
657 srand(seed);
658
659 /* Try to assign up to 100x */
660 for (size_t i = 0; i < 100; ++i) {
661 uint32_t try;
662 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
663
664 if (config_find_lease_by_hostid(try))
665 continue;
666
667 list_for_each_entry(c, &iface->ia_assignments, head) {
668 if (c->assigned > try || !(c->flags & OAF_DHCPV6_NA)) {
669 a->assigned = try;
670 list_add_tail(&a->head, &c->head);
671 return true;
672 } else if (c->assigned == try)
673 break;
674 }
675 }
676
677 return false;
678 }
679
680 static void handle_addrlist_change(struct netevent_handler_info *info)
681 {
682 struct interface *iface = info->iface;
683 struct dhcp_assignment *c, *d, *border = list_last_entry(
684 &iface->ia_assignments, struct dhcp_assignment, head);
685 struct list_head reassign = LIST_HEAD_INIT(reassign);
686 time_t now = odhcpd_time();
687
688 list_for_each_entry(c, &iface->ia_assignments, head) {
689 if ((c->flags & OAF_DHCPV6_PD) && !(iface->ra_flags & ND_RA_FLAG_MANAGED)
690 && (c->flags & OAF_BOUND))
691 __apply_lease(c, info->addrs_old.addrs,
692 info->addrs_old.len, false);
693 }
694
695 set_border_assignment_size(iface, border);
696
697 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
698 if (c->clid_len == 0 ||
699 !(c->flags & OAF_DHCPV6_PD) ||
700 (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
701 c->managed_size)
702 continue;
703
704 if (c->assigned == 0 || c->assigned >= border->assigned)
705 list_move(&c->head, &reassign);
706 else if (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->flags & OAF_DHCPV6_PD) {
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 }
871
872 if (a->flags & OAF_DHCPV6_NA) {
873 struct dhcpv6_ia_addr o_ia_a = {
874 .type = htons(DHCPV6_OPT_IA_ADDR),
875 .len = htons(sizeof(o_ia_a) - 4),
876 .addr = addrs[i].addr.in6,
877 .preferred = htonl(prefix_pref),
878 .valid = htonl(prefix_valid)
879 };
880
881 o_ia_a.addr.s6_addr32[3] = htonl(a->assigned);
882
883 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
884 a->assigned == 0)
885 continue;
886
887 if (buflen < ia_len + sizeof(o_ia_a))
888 return 0;
889
890 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
891 ia_len += sizeof(o_ia_a);
892 }
893
894 /* Calculate T1 / T2 based on non-deprecated addresses */
895 if (prefix_pref > 0) {
896 if (prefix_pref < pref)
897 pref = prefix_pref;
898
899 if (prefix_valid < valid)
900 valid = prefix_valid;
901 }
902 }
903
904 if (!INFINITE_VALID(a->valid_until))
905 /* UINT32_MAX is considered as infinite leasetime */
906 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
907
908 o_ia.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
909 o_ia.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
910
911 if (!o_ia.t1)
912 o_ia.t1 = htonl(1);
913
914 if (!o_ia.t2)
915 o_ia.t2 = htonl(1);
916 }
917
918 if (!request) {
919 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
920 uint16_t otype, olen;
921
922 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
923 struct dhcpv6_ia_prefix *ia_p = (struct dhcpv6_ia_prefix *)&odata[-4];
924 struct dhcpv6_ia_addr *ia_a = (struct dhcpv6_ia_addr *)&odata[-4];
925 bool found = false;
926
927 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*ia_p) - 4) &&
928 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*ia_a) - 4))
929 continue;
930
931 if (a) {
932 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
933 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
934
935 for (size_t i = 0; i < addrlen; ++i) {
936 if (!valid_addr(&addrs[i], now))
937 continue;
938
939 struct in6_addr addr = addrs[i].addr.in6;
940 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
941 addr.s6_addr32[1] |= htonl(a->assigned);
942 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
943
944 if (!memcmp(&ia_p->addr, &addr, sizeof(addr)) &&
945 ia_p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
946 found = true;
947 } else {
948 addr.s6_addr32[3] = htonl(a->assigned);
949
950 if (!memcmp(&ia_a->addr, &addr, sizeof(addr)))
951 found = true;
952 }
953 }
954 }
955
956 if (!found) {
957 if (otype == DHCPV6_OPT_IA_PREFIX) {
958 struct dhcpv6_ia_prefix o_ia_p = {
959 .type = htons(DHCPV6_OPT_IA_PREFIX),
960 .len = htons(sizeof(o_ia_p) - 4),
961 .preferred = 0,
962 .valid = 0,
963 .prefix = ia_p->prefix,
964 .addr = ia_p->addr,
965 };
966
967 if (buflen < ia_len + sizeof(o_ia_p))
968 return 0;
969
970 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
971 ia_len += sizeof(o_ia_p);
972 } else {
973 struct dhcpv6_ia_addr o_ia_a = {
974 .type = htons(DHCPV6_OPT_IA_ADDR),
975 .len = htons(sizeof(o_ia_a) - 4),
976 .addr = ia_a->addr,
977 .preferred = 0,
978 .valid = 0,
979 };
980
981 if (buflen < ia_len + sizeof(o_ia_a))
982 continue;
983
984 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
985 ia_len += sizeof(o_ia_a);
986 }
987 }
988 }
989 }
990
991 o_ia.len = htons(ia_len - 4);
992 memcpy(buf, &o_ia, sizeof(o_ia));
993 return ia_len;
994 }
995
996 struct log_ctxt {
997 char *buf;
998 int buf_len;
999 int buf_idx;
1000 };
1001
1002 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
1003 _unused uint32_t valid, void *arg)
1004 {
1005 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
1006 char addrbuf[INET6_ADDRSTRLEN];
1007
1008 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
1009 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
1010 "%s/%d ", addrbuf, prefix);
1011 }
1012
1013 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
1014 const char *duidbuf, bool is_pd, struct dhcp_assignment *a, int code)
1015 {
1016 const char *type = "UNKNOWN";
1017 const char *status = "UNKNOWN";
1018
1019 switch (msgtype) {
1020 case DHCPV6_MSG_SOLICIT:
1021 type = "SOLICIT";
1022 break;
1023 case DHCPV6_MSG_REQUEST:
1024 type = "REQUEST";
1025 break;
1026 case DHCPV6_MSG_CONFIRM:
1027 type = "CONFIRM";
1028 break;
1029 case DHCPV6_MSG_RENEW:
1030 type = "RENEW";
1031 break;
1032 case DHCPV6_MSG_REBIND:
1033 type = "REBIND";
1034 break;
1035 case DHCPV6_MSG_RELEASE:
1036 type = "RELEASE";
1037 break;
1038 case DHCPV6_MSG_DECLINE:
1039 type = "DECLINE";
1040 break;
1041 }
1042
1043 switch (code) {
1044 case DHCPV6_STATUS_OK:
1045 status = "ok";
1046 break;
1047 case DHCPV6_STATUS_NOADDRSAVAIL:
1048 status = "no addresses available";
1049 break;
1050 case DHCPV6_STATUS_NOBINDING:
1051 status = "no binding";
1052 break;
1053 case DHCPV6_STATUS_NOTONLINK:
1054 status = "not on-link";
1055 break;
1056 case DHCPV6_STATUS_NOPREFIXAVAIL:
1057 status = "no prefix available";
1058 break;
1059 }
1060
1061 char leasebuf[256] = "";
1062
1063 if (a) {
1064 struct log_ctxt ctxt = {.buf = leasebuf,
1065 .buf_len = sizeof(leasebuf),
1066 .buf_idx = 0 };
1067
1068 dhcpv6_ia_enum_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1069 }
1070
1071 syslog(LOG_INFO, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1072 duidbuf, iface->name, status, leasebuf);
1073 }
1074
1075 static bool dhcpv6_ia_on_link(const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
1076 struct interface *iface)
1077 {
1078 struct odhcpd_ipaddr *addrs = (a && a->managed) ? a->managed : iface->addr6;
1079 size_t addrlen = (a && a->managed) ? (size_t)a->managed_size : iface->addr6_len;
1080 time_t now = odhcpd_time();
1081 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
1082 uint16_t otype, olen;
1083 bool onlink = true;
1084
1085 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
1086 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix *)&odata[-4];
1087 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr *)&odata[-4];
1088
1089 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
1090 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
1091 continue;
1092
1093 onlink = false;
1094 for (size_t i = 0; i < addrlen; ++i) {
1095 if (!valid_addr(&addrs[i], now))
1096 continue;
1097
1098 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
1099 if (p->prefix < addrs[i].prefix ||
1100 odhcpd_bmemcmp(&p->addr, &addrs[i].addr.in6, addrs[i].prefix))
1101 continue;
1102
1103 } else if (odhcpd_bmemcmp(&n->addr, &addrs[i].addr.in6, addrs[i].prefix))
1104 continue;
1105
1106 onlink = true;
1107 }
1108
1109 if (!onlink)
1110 break;
1111 }
1112
1113 return onlink;
1114 }
1115
1116 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
1117 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1118 {
1119 struct lease *l;
1120 struct dhcp_assignment *first = NULL;
1121 const struct dhcpv6_client_header *hdr = data;
1122 time_t now = odhcpd_time();
1123 uint16_t otype, olen, clid_len = 0;
1124 uint8_t *start = (uint8_t *)&hdr[1], *odata;
1125 uint8_t *clid_data = NULL, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1126 size_t hostname_len = 0, response_len = 0;
1127 bool notonlink = false, rapid_commit = false, accept_reconf = false;
1128 char duidbuf[261], hostname[256];
1129
1130 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1131 if (otype == DHCPV6_OPT_CLIENTID) {
1132 clid_data = odata;
1133 clid_len = olen;
1134
1135 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1136 memcpy(mac, &odata[8], sizeof(mac));
1137 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1138 memcpy(mac, &odata[4], sizeof(mac));
1139
1140 if (olen <= 130)
1141 odhcpd_hexlify(duidbuf, odata, olen);
1142 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1143 uint8_t fqdn_buf[256];
1144 memcpy(fqdn_buf, odata, olen);
1145 fqdn_buf[olen++] = 0;
1146
1147 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1148 hostname_len = strcspn(hostname, ".");
1149 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1150 accept_reconf = true;
1151 else if (otype == DHCPV6_OPT_RAPID_COMMIT && hdr->msg_type == DHCPV6_MSG_SOLICIT)
1152 rapid_commit = true;
1153 }
1154
1155 if (!clid_data || !clid_len || clid_len > 130)
1156 goto out;
1157
1158 l = config_find_lease_by_duid(clid_data, clid_len);
1159 if (!l)
1160 l = config_find_lease_by_mac(mac);
1161
1162 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1163 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1164 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1165 bool ia_addr_present = false;
1166 if (!is_pd && !is_na)
1167 continue;
1168
1169 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1170 size_t ia_response_len = 0;
1171 uint8_t reqlen = (is_pd) ? 62 : 128;
1172 uint32_t reqhint = 0;
1173
1174 /* Parse request hint for IA-PD */
1175 if (is_pd) {
1176 uint8_t *sdata;
1177 uint16_t stype, slen;
1178 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1179 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1180 continue;
1181
1182 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1183 if (p->prefix) {
1184 reqlen = p->prefix;
1185 reqhint = ntohl(p->addr.s6_addr32[1]);
1186 if (reqlen > 32 && reqlen <= 64)
1187 reqhint &= (1U << (64 - reqlen)) - 1;
1188 }
1189 }
1190
1191 if (reqlen > 64)
1192 reqlen = 64;
1193 } else if (is_na) {
1194 uint8_t *sdata;
1195 uint16_t stype, slen;
1196 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1197 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1198 continue;
1199
1200 ia_addr_present = true;
1201 }
1202 }
1203
1204 /* Find assignment */
1205 struct dhcp_assignment *c, *a = NULL;
1206 list_for_each_entry(c, &iface->ia_assignments, head) {
1207 if ((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) &&
1208 c->iaid == ia->iaid && (INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1209 ((is_pd && (c->flags & OAF_DHCPV6_PD)) || (is_na && (c->flags & OAF_DHCPV6_NA)))) {
1210 a = c;
1211
1212 /* Reset state */
1213 if (a->flags & OAF_BOUND)
1214 apply_lease(a, false);
1215
1216 stop_reconf(a);
1217 break;
1218 }
1219 }
1220
1221 if (l && a && a->lease != l) {
1222 free_assignment(a);
1223 a = NULL;
1224 }
1225
1226 /* Generic message handling */
1227 uint16_t status = DHCPV6_STATUS_OK;
1228 if (a && a->managed_size < 0)
1229 return -1;
1230
1231 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1232 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1233 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1234 bool assigned = !!a;
1235
1236 if (!a) {
1237 if ((!iface->no_dynamic_dhcp || (l && is_na)) &&
1238 (iface->dhcpv6_pd || iface->dhcpv6_na)) {
1239 /* Create new binding */
1240 a = alloc_assignment(clid_len);
1241
1242 if (a) {
1243 a->clid_len = clid_len;
1244 memcpy(a->clid_data, clid_data, clid_len);
1245 a->iaid = ia->iaid;
1246 a->length = reqlen;
1247 a->peer = *addr;
1248 a->assigned = is_na && l ? l->hostid : reqhint;
1249 /* Set valid time to 0 for static lease indicating */
1250 /* infinite lifetime otherwise current time */
1251 a->valid_until = l ? 0 : now;
1252 a->dhcp_free_cb = dhcpv6_ia_free_assignment;
1253 a->iface = iface;
1254 a->flags = (is_pd ? OAF_DHCPV6_PD : OAF_DHCPV6_NA);
1255
1256 if (first)
1257 memcpy(a->key, first->key, sizeof(a->key));
1258 else
1259 odhcpd_urandom(a->key, sizeof(a->key));
1260
1261 if (is_pd && iface->dhcpv6_pd)
1262 while (!(assigned = assign_pd(iface, a)) &&
1263 !a->managed_size && ++a->length <= 64);
1264 else if (is_na && iface->dhcpv6_na)
1265 assigned = assign_na(iface, a);
1266
1267 if (l && assigned) {
1268 a->flags |= OAF_STATIC;
1269
1270 if (l->hostname)
1271 a->hostname = strdup(l->hostname);
1272
1273 if (l->leasetime)
1274 a->leasetime = l->leasetime;
1275
1276 list_add(&a->lease_list, &l->assignments);
1277 a->lease = l;
1278 }
1279
1280 if (a->managed_size && !assigned)
1281 return -1;
1282 }
1283 }
1284 }
1285
1286 if (!assigned || iface->addr6_len == 0)
1287 /* Set error status */
1288 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1289 else if (hdr->msg_type == DHCPV6_MSG_REQUEST && !dhcpv6_ia_on_link(ia, a, iface)) {
1290 /* Send NOTONLINK staus for the IA */
1291 status = DHCPV6_STATUS_NOTONLINK;
1292 assigned = false;
1293 } else if (accept_reconf && assigned && !first &&
1294 hdr->msg_type != DHCPV6_MSG_REBIND) {
1295 size_t handshake_len = 4;
1296 buf[0] = 0;
1297 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1298 buf[2] = 0;
1299 buf[3] = 0;
1300
1301 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1302 struct dhcpv6_auth_reconfigure auth = {
1303 htons(DHCPV6_OPT_AUTH),
1304 htons(sizeof(auth) - 4),
1305 3, 1, 0,
1306 {htonl(time(NULL)), htonl(++serial)},
1307 1,
1308 {0}
1309 };
1310 memcpy(auth.key, a->key, sizeof(a->key));
1311 memcpy(buf + handshake_len, &auth, sizeof(auth));
1312 handshake_len += sizeof(auth);
1313 }
1314
1315
1316 buf += handshake_len;
1317 buflen -= handshake_len;
1318 response_len += handshake_len;
1319
1320 first = a;
1321 }
1322
1323 ia_response_len = build_ia(buf, buflen, status, ia, a, iface,
1324 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1325
1326 /* Was only a solicitation: mark binding for removal */
1327 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT && !rapid_commit) {
1328 a->flags &= ~OAF_BOUND;
1329 a->flags |= OAF_TENTATIVE;
1330
1331 if (!(a->flags & OAF_STATIC))
1332 /* Keep tentative assignment around for 60 seconds */
1333 a->valid_until = now + 60;
1334
1335 } else if (assigned &&
1336 ((hdr->msg_type == DHCPV6_MSG_SOLICIT && rapid_commit) ||
1337 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1338 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1339 if ((!(a->flags & OAF_STATIC) || !a->hostname) && hostname_len > 0) {
1340 a->hostname = realloc(a->hostname, hostname_len + 1);
1341 if (a->hostname) {
1342 memcpy(a->hostname, hostname, hostname_len);
1343 a->hostname[hostname_len] = 0;
1344
1345 if (odhcpd_valid_hostname(a->hostname))
1346 a->flags &= ~OAF_BROKEN_HOSTNAME;
1347 else
1348 a->flags |= OAF_BROKEN_HOSTNAME;
1349 }
1350 }
1351 a->accept_reconf = accept_reconf;
1352 a->flags &= ~OAF_TENTATIVE;
1353 a->flags |= OAF_BOUND;
1354 apply_lease(a, true);
1355 } else if (!assigned && a && a->managed_size == 0) {
1356 /* Cleanup failed assignment */
1357 free_assignment(a);
1358 a = NULL;
1359 }
1360 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1361 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1362 hdr->msg_type == DHCPV6_MSG_REBIND ||
1363 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1364 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1365 status = DHCPV6_STATUS_NOBINDING;
1366 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1367 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1368 hdr->msg_type == DHCPV6_MSG_REBIND) {
1369 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1370 if (a) {
1371 a->flags |= OAF_BOUND;
1372 apply_lease(a, true);
1373 }
1374 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1375 if (a->flags & OAF_STATIC) {
1376 apply_lease(a, false);
1377 a->flags &= ~OAF_BOUND;
1378 }
1379 else
1380 a->valid_until = now - 1;
1381
1382 } else if ((a->flags & OAF_DHCPV6_NA) && hdr->msg_type == DHCPV6_MSG_DECLINE) {
1383 a->flags &= ~OAF_BOUND;
1384
1385 if (!(a->flags & OAF_STATIC)) {
1386 memset(a->clid_data, 0, a->clid_len);
1387 a->valid_until = now + 3600; /* Block address for 1h */
1388 }
1389 }
1390 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM) {
1391 if (ia_addr_present && !dhcpv6_ia_on_link(ia, a, iface)) {
1392 notonlink = true;
1393 break;
1394 }
1395
1396 if (!ia_addr_present || !a || !(a->flags & OAF_BOUND)) {
1397 response_len = 0;
1398 goto out;
1399 }
1400 }
1401
1402 buf += ia_response_len;
1403 buflen -= ia_response_len;
1404 response_len += ia_response_len;
1405 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1406 }
1407
1408 switch (hdr->msg_type) {
1409 case DHCPV6_MSG_RELEASE:
1410 case DHCPV6_MSG_DECLINE:
1411 case DHCPV6_MSG_CONFIRM:
1412 if (response_len + 6 < buflen) {
1413 buf[0] = 0;
1414 buf[1] = DHCPV6_OPT_STATUS;
1415 buf[2] = 0;
1416 buf[3] = 2;
1417 buf[4] = 0;
1418 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1419 response_len += 6;
1420 }
1421 break;
1422
1423 default:
1424 break;
1425 }
1426
1427 dhcpv6_ia_write_statefile();
1428
1429 out:
1430 return response_len;
1431 }
OpenWrt DHCP Server