projects / project / odhcpd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
treewide: fix compiler warnings
[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 if (!enable && iface->ia_assignments.next) {
66 struct dhcp_assignment *c;
67
68 while (!list_empty(&iface->ia_assignments)) {
69 c = list_first_entry(&iface->ia_assignments, struct dhcp_assignment, head);
70 free_assignment(c);
71 }
72 }
73
74 if (enable && iface->dhcpv6 == MODE_SERVER) {
75 struct dhcp_assignment *border;
76
77 if (!iface->ia_assignments.next)
78 INIT_LIST_HEAD(&iface->ia_assignments);
79
80 if (list_empty(&iface->ia_assignments)) {
81 border = calloc(1, sizeof(*border));
82
83 if (!border) {
84 syslog(LOG_ERR, "Calloc failed for border on %s", iface->name);
85 return -1;
86 }
87
88 border->length = 64;
89 list_add(&border->head, &iface->ia_assignments);
90 } else
91 border = list_last_entry(&iface->ia_assignments, struct dhcp_assignment, head);
92
93 set_border_assignment_size(iface, border);
94 }
95 return 0;
96 }
97
98
99 static void dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info)
100 {
101 struct interface *iface = info->iface;
102
103 if (!iface || iface->dhcpv6 != MODE_SERVER)
104 return;
105
106 switch (event) {
107 case NETEV_ADDR6LIST_CHANGE:
108 handle_addrlist_change(info);
109 break;
110 default:
111 break;
112 }
113 }
114
115
116 static inline bool valid_prefix_length(const struct dhcp_assignment *a, const uint8_t prefix_length)
117 {
118 return (a->managed_size || a->length > prefix_length);
119 }
120
121 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
122 {
123 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
124 }
125
126 static size_t get_preferred_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
127 {
128 size_t i, m;
129
130 for (i = 0, m = 0; i < addrlen; ++i) {
131 if (addrs[i].preferred > addrs[m].preferred ||
132 (addrs[i].preferred == addrs[m].preferred &&
133 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
134 m = i;
135 }
136
137 return m;
138 }
139
140 static int send_reconf(struct dhcp_assignment *assign)
141 {
142 struct {
143 struct dhcpv6_client_header hdr;
144 uint16_t srvid_type;
145 uint16_t srvid_len;
146 uint16_t duid_type;
147 uint16_t hardware_type;
148 uint8_t mac[6];
149 uint16_t msg_type;
150 uint16_t msg_len;
151 uint8_t msg_id;
152 struct dhcpv6_auth_reconfigure auth;
153 uint16_t clid_type;
154 uint16_t clid_len;
155 uint8_t clid_data[128];
156 } __attribute__((packed)) reconf_msg = {
157 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
158 .srvid_type = htons(DHCPV6_OPT_SERVERID),
159 .srvid_len = htons(10),
160 .duid_type = htons(3),
161 .hardware_type = htons(1),
162 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
163 .msg_len = htons(1),
164 .msg_id = DHCPV6_MSG_RENEW,
165 .auth = {htons(DHCPV6_OPT_AUTH),
166 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
167 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
168 .clid_type = htons(DHCPV6_OPT_CLIENTID),
169 .clid_len = htons(assign->clid_len),
170 .clid_data = {0},
171 };
172 struct interface *iface = assign->iface;
173
174 odhcpd_get_mac(iface, reconf_msg.mac);
175 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
176 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
177
178 md5_ctx_t md5;
179 uint8_t secretbytes[64];
180 memset(secretbytes, 0, sizeof(secretbytes));
181 memcpy(secretbytes, assign->key, sizeof(assign->key));
182
183 for (size_t i = 0; i < sizeof(secretbytes); ++i)
184 secretbytes[i] ^= 0x36;
185
186 md5_begin(&md5);
187 md5_hash(secretbytes, sizeof(secretbytes), &md5);
188 md5_hash(iov.iov_base, iov.iov_len, &md5);
189 md5_end(reconf_msg.auth.key, &md5);
190
191 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
192 secretbytes[i] ^= 0x36;
193 secretbytes[i] ^= 0x5c;
194 }
195
196 md5_begin(&md5);
197 md5_hash(secretbytes, sizeof(secretbytes), &md5);
198 md5_hash(reconf_msg.auth.key, 16, &md5);
199 md5_end(reconf_msg.auth.key, &md5);
200
201 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
202 }
203
204 static void dhcpv6_ia_free_assignment(struct dhcp_assignment *a)
205 {
206 if (a->managed_sock.fd.registered) {
207 ustream_free(&a->managed_sock.stream);
208 close(a->managed_sock.fd.fd);
209 }
210
211 if (a->reconf_cnt)
212 stop_reconf(a);
213
214 free(a->managed);
215 }
216
217 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c,
218 time_t now, dhcpv6_binding_cb_handler_t func, void *arg)
219 {
220 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->addr6;
221 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->addr6_len;
222 size_t m = get_preferred_addr(addrs, addrlen);
223
224 for (size_t i = 0; i < addrlen; ++i) {
225 struct in6_addr addr;
226 uint32_t pref, valid;
227 int prefix = c->managed ? addrs[i].prefix : c->length;
228
229 if (!valid_addr(&addrs[i], now))
230 continue;
231
232 addr = addrs[i].addr.in6;
233 pref = addrs[i].preferred;
234 valid = addrs[i].valid;
235 if (prefix == 128) {
236 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs))
237 continue;
238
239 addr.s6_addr32[3] = htonl(c->assigned);
240 } else {
241 if (!valid_prefix_length(c, addrs[i].prefix))
242 continue;
243
244 addr.s6_addr32[1] |= htonl(c->assigned);
245 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
246 }
247
248 if (pref != UINT32_MAX)
249 pref -= now;
250
251 if (valid != UINT32_MAX)
252 valid -= now;
253
254 func(&addr, prefix, pref, valid, arg);
255 }
256 }
257
258 struct write_ctxt {
259 FILE *fp;
260 md5_ctx_t md5;
261 struct dhcp_assignment *c;
262 struct interface *iface;
263 char *buf;
264 int buf_len;
265 int buf_idx;
266 };
267
268 static void dhcpv6_write_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
269 _unused uint32_t valid, void *arg)
270 {
271 struct write_ctxt *ctxt = (struct write_ctxt *)arg;
272 char ipbuf[INET6_ADDRSTRLEN];
273
274 inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf) - 1);
275
276 if (ctxt->c->length == 128 && ctxt->c->hostname &&
277 !(ctxt->c->flags & OAF_BROKEN_HOSTNAME)) {
278 fputs(ipbuf, ctxt->fp);
279
280 char b[256];
281 if (dn_expand(ctxt->iface->search, ctxt->iface->search + ctxt->iface->search_len,
282 ctxt->iface->search, b, sizeof(b)) > 0)
283 fprintf(ctxt->fp, "\t%s.%s", ctxt->c->hostname, b);
284
285 fprintf(ctxt->fp, "\t%s\n", ctxt->c->hostname);
286 md5_hash(ipbuf, strlen(ipbuf), &ctxt->md5);
287 md5_hash(ctxt->c->hostname, strlen(ctxt->c->hostname), &ctxt->md5);
288 }
289
290 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx,ctxt->buf_len - ctxt->buf_idx,
291 "%s/%d ", ipbuf, prefix);
292 }
293
294 void dhcpv6_ia_write_statefile(void)
295 {
296 struct write_ctxt ctxt;
297
298 md5_begin(&ctxt.md5);
299
300 if (config.dhcp_statefile) {
301 time_t now = odhcpd_time(), wall_time = time(NULL);
302 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
303 char leasebuf[512];
304
305 if (fd < 0)
306 return;
307 int ret;
308 ret = lockf(fd, F_LOCK, 0);
309 if (ret < 0) {
310 close(fd);
311 return;
312 }
313 if (ftruncate(fd, 0) < 0) {}
314
315 ctxt.fp = fdopen(fd, "w");
316 if (!ctxt.fp) {
317 close(fd);
318 return;
319 }
320
321 ctxt.buf = leasebuf;
322 ctxt.buf_len = sizeof(leasebuf);
323
324 avl_for_each_element(&interfaces, ctxt.iface, avl) {
325 if (ctxt.iface->dhcpv6 != MODE_SERVER &&
326 ctxt.iface->dhcpv4 != MODE_SERVER)
327 continue;
328
329 if (ctxt.iface->dhcpv6 == MODE_SERVER &&
330 ctxt.iface->ia_assignments.next) {
331 list_for_each_entry(ctxt.c, &ctxt.iface->ia_assignments, head) {
332 if (!(ctxt.c->flags & OAF_BOUND) || ctxt.c->managed_size < 0)
333 continue;
334
335 char duidbuf[264];
336
337 odhcpd_hexlify(duidbuf, ctxt.c->clid_data, ctxt.c->clid_len);
338
339 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
340 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s %x %s%s %ld %x %u ",
341 ctxt.iface->ifname, duidbuf, ntohl(ctxt.c->iaid),
342 (ctxt.c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
343 (ctxt.c->hostname ? ctxt.c->hostname : "-"),
344 (ctxt.c->valid_until > now ?
345 (ctxt.c->valid_until - now + wall_time) :
346 (INFINITE_VALID(ctxt.c->valid_until) ? -1 : 0)),
347 ctxt.c->assigned, (unsigned)ctxt.c->length);
348
349 if (INFINITE_VALID(ctxt.c->valid_until) || ctxt.c->valid_until > now)
350 dhcpv6_ia_enum_addrs(ctxt.iface, ctxt.c, now,
351 dhcpv6_write_ia_addr, &ctxt);
352
353 ctxt.buf[ctxt.buf_idx - 1] = '\n';
354 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
355 }
356 }
357
358 if (ctxt.iface->dhcpv4 == MODE_SERVER &&
359 ctxt.iface->dhcpv4_assignments.next) {
360 struct dhcp_assignment *c;
361 list_for_each_entry(c, &ctxt.iface->dhcpv4_assignments, head) {
362 if (!(c->flags & OAF_BOUND))
363 continue;
364
365 char ipbuf[INET6_ADDRSTRLEN];
366 char duidbuf[16];
367 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
368
369 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
370 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s ipv4 %s%s %ld %x 32 ",
371 ctxt.iface->ifname, duidbuf,
372 (c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
373 (c->hostname ? c->hostname : "-"),
374 (c->valid_until > now ?
375 (c->valid_until - now + wall_time) :
376 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
377 ntohl(c->addr));
378
379 struct in_addr addr = {.s_addr = c->addr};
380 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
381
382 if (c->hostname && !(c->flags & OAF_BROKEN_HOSTNAME)) {
383 fputs(ipbuf, ctxt.fp);
384
385 char b[256];
386 if (dn_expand(ctxt.iface->search,
387 ctxt.iface->search + ctxt.iface->search_len,
388 ctxt.iface->search, b, sizeof(b)) > 0)
389 fprintf(ctxt.fp, "\t%s.%s", c->hostname, b);
390
391 fprintf(ctxt.fp, "\t%s\n", c->hostname);
392 md5_hash(ipbuf, strlen(ipbuf), &ctxt.md5);
393 md5_hash(c->hostname, strlen(c->hostname), &ctxt.md5);
394 }
395
396 ctxt.buf_idx += snprintf(ctxt.buf + ctxt.buf_idx,
397 ctxt.buf_len - ctxt.buf_idx,
398 "%s/32 ", ipbuf);
399 ctxt.buf[ctxt.buf_idx - 1] = '\n';
400 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
401 }
402 }
403 }
404
405 fclose(ctxt.fp);
406 }
407
408 uint8_t newmd5[16];
409 md5_end(newmd5, &ctxt.md5);
410
411 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
412 memcpy(statemd5, newmd5, sizeof(statemd5));
413 char *argv[2] = {config.dhcp_cb, NULL};
414 if (!vfork()) {
415 execv(argv[0], argv);
416 _exit(128);
417 }
418 }
419 }
420
421 static void __apply_lease(struct interface *iface, struct dhcp_assignment *a,
422 struct odhcpd_ipaddr *addrs, ssize_t addr_len, bool add)
423 {
424 if (a->length > 64)
425 return;
426
427 for (ssize_t i = 0; i < addr_len; ++i) {
428 struct in6_addr prefix = addrs[i].addr.in6;
429 prefix.s6_addr32[1] |= htonl(a->assigned);
430 prefix.s6_addr32[2] = prefix.s6_addr32[3] = 0;
431 netlink_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
432 iface->ifindex, &a->peer.sin6_addr, 1024, add);
433 }
434 }
435
436 static void apply_lease(struct interface *iface, struct dhcp_assignment *a, bool add)
437 {
438 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
439 ssize_t addrlen = (a->managed) ? a->managed_size : (ssize_t)iface->addr6_len;
440
441 __apply_lease(iface, a, addrs, addrlen, add);
442 }
443
444 /* Set border assignment size based on the IPv6 address prefixes */
445 static void set_border_assignment_size(struct interface *iface, struct dhcp_assignment *b)
446 {
447 time_t now = odhcpd_time();
448 int minprefix = -1;
449
450 for (size_t i = 0; i < iface->addr6_len; ++i) {
451 if (iface->addr6[i].preferred > (uint32_t)now &&
452 iface->addr6[i].prefix < 64 &&
453 iface->addr6[i].prefix > minprefix)
454 minprefix = iface->addr6[i].prefix;
455 }
456
457 if (minprefix > 32 && minprefix <= 64)
458 b->assigned = 1U << (64 - minprefix);
459 else
460 b->assigned = 0;
461 }
462
463 /* More data was received from TCP connection */
464 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
465 {
466 struct ustream_fd *fd = container_of(s, struct ustream_fd, stream);
467 struct dhcp_assignment *c = container_of(fd, struct dhcp_assignment, managed_sock);
468 time_t now = odhcpd_time();
469 bool first = c->managed_size < 0;
470
471 for (;;) {
472 int pending;
473 char *data = ustream_get_read_buf(s, &pending);
474 char *end = memmem(data, pending, "\n\n", 2);
475
476 if (!end)
477 break;
478
479 end += 2;
480 end[-1] = 0;
481
482 c->managed_size = 0;
483 if (c->accept_reconf)
484 c->reconf_cnt = 1;
485
486 char *saveptr;
487 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
488 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
489 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
490
491 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
492 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
493 continue;
494
495 x = strtok_r(NULL, ",", &saveptr2);
496 if (sscanf(x, "%hhu", &n->prefix) < 1)
497 continue;
498
499 x = strtok_r(NULL, ",", &saveptr2);
500 if (sscanf(x, "%u", &n->preferred) < 1)
501 continue;
502
503 x = strtok_r(NULL, ",", &saveptr2);
504 if (sscanf(x, "%u", &n->valid) < 1)
505 continue;
506
507 if (n->preferred > n->valid)
508 continue;
509
510 if (UINT32_MAX - now < n->preferred)
511 n->preferred = UINT32_MAX;
512 else
513 n->preferred += now;
514
515 if (UINT32_MAX - now < n->valid)
516 n->valid = UINT32_MAX;
517 else
518 n->valid += now;
519
520 n->dprefix = 0;
521
522 ++c->managed_size;
523 }
524
525 ustream_consume(s, end - data);
526 }
527
528 if (first && c->managed_size == 0)
529 free_assignment(c);
530 else if (first && !(c->flags & OAF_STATIC))
531 c->valid_until = now + 150;
532 }
533
534
535 /* TCP transmission has ended, either because of success or timeout or other error */
536 static void managed_handle_pd_done(struct ustream *s)
537 {
538 struct ustream_fd *fd = container_of(s, struct ustream_fd, stream);
539 struct dhcp_assignment *c = container_of(fd, struct dhcp_assignment, managed_sock);
540
541 if (!(c->flags & OAF_STATIC))
542 c->valid_until = odhcpd_time() + 15;
543
544 c->managed_size = 0;
545
546 if (c->accept_reconf)
547 c->reconf_cnt = 1;
548 }
549
550 static bool assign_pd(struct interface *iface, struct dhcp_assignment *assign)
551 {
552 struct dhcp_assignment *c;
553
554 if (iface->dhcpv6_pd_manager[0]) {
555 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
556 if (fd >= 0) {
557 struct pollfd pfd = { .fd = fd, .events = POLLIN };
558 char iaidbuf[298];
559
560 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
561
562 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
563 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
564 ustream_fd_init(&assign->managed_sock, fd);
565 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
566 iaidbuf, assign->iaid, assign->length);
567 ustream_write_pending(&assign->managed_sock.stream);
568 assign->managed_size = -1;
569
570 if (!(assign->flags & OAF_STATIC))
571 assign->valid_until = odhcpd_time() + 15;
572
573 list_add(&assign->head, &iface->ia_assignments);
574
575 /* Wait initial period of up to 250ms for immediate assignment */
576 if (poll(&pfd, 1, 250) < 0) {
577 syslog(LOG_ERR, "poll(): %m");
578 return false;
579 }
580
581 managed_handle_pd_data(&assign->managed_sock.stream, 0);
582
583 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
584 return true;
585 }
586
587 return false;
588 } else if (iface->addr6_len < 1)
589 return false;
590
591 /* Try honoring the hint first */
592 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
593 if (assign->assigned) {
594 list_for_each_entry(c, &iface->ia_assignments, head) {
595 if (c->length == 128 || c->length == 0)
596 continue;
597
598 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
599 list_add_tail(&assign->head, &c->head);
600
601 if (assign->flags & OAF_BOUND)
602 apply_lease(iface, assign, true);
603
604 return true;
605 }
606
607 if (c->assigned != 0)
608 current = (c->assigned + (1 << (64 - c->length)));
609 }
610 }
611
612 /* Fallback to a variable assignment */
613 current = 1;
614 list_for_each_entry(c, &iface->ia_assignments, head) {
615 if (c->length == 128 || c->length == 0)
616 continue;
617
618 current = (current + asize) & (~asize);
619 if (current + asize < c->assigned) {
620 assign->assigned = current;
621 list_add_tail(&assign->head, &c->head);
622
623 if (assign->flags & OAF_BOUND)
624 apply_lease(iface, assign, true);
625
626 return true;
627 }
628
629 if (c->assigned != 0)
630 current = (c->assigned + (1 << (64 - c->length)));
631 }
632
633 return false;
634 }
635
636 static bool assign_na(struct interface *iface, struct dhcp_assignment *a)
637 {
638 struct dhcp_assignment *c;
639 uint32_t seed = 0;
640
641 /* Preconfigured assignment by static lease */
642 if (a->assigned) {
643 list_for_each_entry(c, &iface->ia_assignments, head) {
644 if (c->length == 0)
645 continue;
646
647 if (c->assigned > a->assigned || c->length != 128) {
648 list_add_tail(&a->head, &c->head);
649 return true;
650 } else if (c->assigned == a->assigned)
651 return false;
652 }
653 }
654
655 /* Seed RNG with checksum of DUID */
656 for (size_t i = 0; i < a->clid_len; ++i)
657 seed += a->clid_data[i];
658 srand(seed);
659
660 /* Try to assign up to 100x */
661 for (size_t i = 0; i < 100; ++i) {
662 uint32_t try;
663 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
664
665 if (config_find_lease_by_hostid(try))
666 continue;
667
668 list_for_each_entry(c, &iface->ia_assignments, head) {
669 if (c->length == 0)
670 continue;
671
672 if (c->assigned > try || c->length != 128) {
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 != border && iface->ra_managed == RA_MANAGED_NO_MFLAG
694 && (c->flags & OAF_BOUND))
695 __apply_lease(iface, 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 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
703 c->managed_size)
704 continue;
705
706 if (c->length < 128 && c->assigned >= border->assigned && c != border)
707 list_move(&c->head, &reassign);
708 else if (c != border && (c->flags & OAF_BOUND))
709 apply_lease(iface, c, true);
710
711 if (c->accept_reconf && c->reconf_cnt == 0) {
712 struct dhcp_assignment *a;
713
714 start_reconf(c);
715
716 /* Leave all other assignments of that client alone */
717 list_for_each_entry(a, &iface->ia_assignments, head)
718 if (a != c && a->clid_len == c->clid_len &&
719 !memcmp(a->clid_data, c->clid_data, a->clid_len))
720 a->reconf_cnt = INT_MAX;
721 }
722 }
723
724 while (!list_empty(&reassign)) {
725 c = list_first_entry(&reassign, struct dhcp_assignment, head);
726 list_del(&c->head);
727 if (!assign_pd(iface, c)) {
728 c->assigned = 0;
729 list_add(&c->head, &iface->ia_assignments);
730 }
731 }
732
733 dhcpv6_ia_write_statefile();
734 }
735
736 static void reconf_timeout_cb(struct uloop_timeout *event)
737 {
738 struct dhcp_assignment *a = container_of(event, struct dhcp_assignment, reconf_timer);
739
740 if (a->reconf_cnt > 0 && a->reconf_cnt < DHCPV6_REC_MAX_RC) {
741 send_reconf(a);
742 uloop_timeout_set(&a->reconf_timer,
743 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
744 a->reconf_cnt++;
745 } else
746 stop_reconf(a);
747 }
748
749 static void start_reconf(struct dhcp_assignment *a)
750 {
751 uloop_timeout_set(&a->reconf_timer,
752 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
753 a->reconf_timer.cb = reconf_timeout_cb;
754 a->reconf_cnt++;
755
756 send_reconf(a);
757 }
758
759 static void stop_reconf(struct dhcp_assignment *a)
760 {
761 uloop_timeout_cancel(&a->reconf_timer);
762 a->reconf_cnt = 0;
763 a->reconf_timer.cb = NULL;
764 }
765
766 static void valid_until_cb(struct uloop_timeout *event)
767 {
768 struct interface *iface;
769 time_t now = odhcpd_time();
770
771 avl_for_each_element(&interfaces, iface, avl) {
772 struct dhcp_assignment *a, *n;
773
774 if (iface->dhcpv6 != MODE_SERVER || iface->ia_assignments.next == NULL)
775 continue;
776
777 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
778 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
779 if ((a->length < 128 && a->clid_len > 0) ||
780 (a->length == 128 && a->clid_len == 0))
781 free_assignment(a);
782
783 }
784 }
785 }
786 uloop_timeout_set(event, 1000);
787 }
788
789 static size_t build_ia(uint8_t *buf, size_t buflen, uint16_t status,
790 const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
791 struct interface *iface, bool request)
792 {
793 struct dhcpv6_ia_hdr o_ia = {
794 .type = ia->type,
795 .len = 0,
796 .iaid = ia->iaid,
797 .t1 = 0,
798 .t2 = 0,
799 };
800 size_t ia_len = sizeof(o_ia);
801 time_t now = odhcpd_time();
802
803 if (buflen < ia_len)
804 return 0;
805
806 if (status) {
807 struct __attribute__((packed)) {
808 uint16_t type;
809 uint16_t len;
810 uint16_t val;
811 } o_status = {
812 .type = htons(DHCPV6_OPT_STATUS),
813 .len = htons(sizeof(o_status) - 4),
814 .val = htons(status),
815 };
816
817 memcpy(buf + ia_len, &o_status, sizeof(o_status));
818 ia_len += sizeof(o_status);
819
820 o_ia.len = htons(ia_len - 4);
821 memcpy(buf, &o_ia, sizeof(o_ia));
822
823 return ia_len;
824 }
825
826 if (a) {
827 uint32_t leasetime;
828
829 if (a->leasetime)
830 leasetime = a->leasetime;
831 else
832 leasetime = iface->dhcpv4_leasetime;
833
834 uint32_t pref = leasetime;
835 uint32_t valid = leasetime;
836
837 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
838 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
839 size_t m = get_preferred_addr(addrs, addrlen);
840
841 for (size_t i = 0; i < addrlen; ++i) {
842 uint32_t prefix_pref = addrs[i].preferred;
843 uint32_t prefix_valid = addrs[i].valid;
844
845 if (!valid_addr(&addrs[i], now))
846 continue;
847
848 if (prefix_pref != UINT32_MAX)
849 prefix_pref -= now;
850
851 if (prefix_valid != UINT32_MAX)
852 prefix_valid -= now;
853
854 if (a->length < 128) {
855 struct dhcpv6_ia_prefix o_ia_p = {
856 .type = htons(DHCPV6_OPT_IA_PREFIX),
857 .len = htons(sizeof(o_ia_p) - 4),
858 .preferred = htonl(prefix_pref),
859 .valid = htonl(prefix_valid),
860 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
861 .addr = addrs[i].addr.in6,
862 };
863
864 o_ia_p.addr.s6_addr32[1] |= htonl(a->assigned);
865 o_ia_p.addr.s6_addr32[2] = o_ia_p.addr.s6_addr32[3] = 0;
866
867 if ((a->assigned == 0 && a->managed_size == 0) ||
868 !valid_prefix_length(a, addrs[i].prefix))
869 continue;
870
871 if (buflen < ia_len + sizeof(o_ia_p))
872 return 0;
873
874 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
875 ia_len += sizeof(o_ia_p);
876 } else {
877 struct dhcpv6_ia_addr o_ia_a = {
878 .type = htons(DHCPV6_OPT_IA_ADDR),
879 .len = htons(sizeof(o_ia_a) - 4),
880 .addr = addrs[i].addr.in6,
881 .preferred = htonl(prefix_pref),
882 .valid = htonl(prefix_valid)
883 };
884
885 o_ia_a.addr.s6_addr32[3] = htonl(a->assigned);
886
887 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
888 a->assigned == 0)
889 continue;
890
891 if (buflen < ia_len + sizeof(o_ia_a))
892 return 0;
893
894 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
895 ia_len += sizeof(o_ia_a);
896 }
897
898 /* Calculate T1 / T2 based on non-deprecated addresses */
899 if (prefix_pref > 0) {
900 if (prefix_pref < pref)
901 pref = prefix_pref;
902
903 if (prefix_valid < valid)
904 valid = prefix_valid;
905 }
906 }
907
908 if (!INFINITE_VALID(a->valid_until))
909 /* UINT32_MAX is considered as infinite leasetime */
910 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
911
912 o_ia.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
913 o_ia.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
914
915 if (!o_ia.t1)
916 o_ia.t1 = htonl(1);
917
918 if (!o_ia.t2)
919 o_ia.t2 = htonl(1);
920 }
921
922 if (!request) {
923 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
924 uint16_t otype, olen;
925
926 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
927 struct dhcpv6_ia_prefix *ia_p = (struct dhcpv6_ia_prefix *)&odata[-4];
928 struct dhcpv6_ia_addr *ia_a = (struct dhcpv6_ia_addr *)&odata[-4];
929 bool found = false;
930
931 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*ia_p) - 4) &&
932 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*ia_a) - 4))
933 continue;
934
935 if (a) {
936 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
937 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
938
939 for (size_t i = 0; i < addrlen; ++i) {
940 if (!valid_addr(&addrs[i], now))
941 continue;
942
943 struct in6_addr addr = addrs[i].addr.in6;
944 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
945 addr.s6_addr32[1] |= htonl(a->assigned);
946 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
947
948 if (!memcmp(&ia_p->addr, &addr, sizeof(addr)) &&
949 ia_p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
950 found = true;
951 } else {
952 addr.s6_addr32[3] = htonl(a->assigned);
953
954 if (!memcmp(&ia_a->addr, &addr, sizeof(addr)))
955 found = true;
956 }
957 }
958 }
959
960 if (!found) {
961 if (otype == DHCPV6_OPT_IA_PREFIX) {
962 struct dhcpv6_ia_prefix o_ia_p = {
963 .type = htons(DHCPV6_OPT_IA_PREFIX),
964 .len = htons(sizeof(o_ia_p) - 4),
965 .preferred = 0,
966 .valid = 0,
967 .prefix = ia_p->prefix,
968 .addr = ia_p->addr,
969 };
970
971 if (buflen < ia_len + sizeof(o_ia_p))
972 return 0;
973
974 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
975 ia_len += sizeof(o_ia_p);
976 } else {
977 struct dhcpv6_ia_addr o_ia_a = {
978 .type = htons(DHCPV6_OPT_IA_ADDR),
979 .len = htons(sizeof(o_ia_a) - 4),
980 .addr = ia_a->addr,
981 .preferred = 0,
982 .valid = 0,
983 };
984
985 if (buflen < ia_len + sizeof(o_ia_a))
986 continue;
987
988 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
989 ia_len += sizeof(o_ia_a);
990 }
991 }
992 }
993 }
994
995 o_ia.len = htons(ia_len - 4);
996 memcpy(buf, &o_ia, sizeof(o_ia));
997 return ia_len;
998 }
999
1000 struct log_ctxt {
1001 char *buf;
1002 int buf_len;
1003 int buf_idx;
1004 };
1005
1006 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
1007 _unused uint32_t valid, void *arg)
1008 {
1009 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
1010 char addrbuf[INET6_ADDRSTRLEN];
1011
1012 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
1013 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
1014 "%s/%d ", addrbuf, prefix);
1015 }
1016
1017 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
1018 const char *duidbuf, bool is_pd, struct dhcp_assignment *a, int code)
1019 {
1020 const char *type = "UNKNOWN";
1021 const char *status = "UNKNOWN";
1022
1023 switch (msgtype) {
1024 case DHCPV6_MSG_SOLICIT:
1025 type = "SOLICIT";
1026 break;
1027 case DHCPV6_MSG_REQUEST:
1028 type = "REQUEST";
1029 break;
1030 case DHCPV6_MSG_CONFIRM:
1031 type = "CONFIRM";
1032 break;
1033 case DHCPV6_MSG_RENEW:
1034 type = "RENEW";
1035 break;
1036 case DHCPV6_MSG_REBIND:
1037 type = "REBIND";
1038 break;
1039 case DHCPV6_MSG_RELEASE:
1040 type = "RELEASE";
1041 break;
1042 case DHCPV6_MSG_DECLINE:
1043 type = "DECLINE";
1044 break;
1045 }
1046
1047 switch (code) {
1048 case DHCPV6_STATUS_OK:
1049 status = "ok";
1050 break;
1051 case DHCPV6_STATUS_NOADDRSAVAIL:
1052 status = "no addresses available";
1053 break;
1054 case DHCPV6_STATUS_NOBINDING:
1055 status = "no binding";
1056 break;
1057 case DHCPV6_STATUS_NOTONLINK:
1058 status = "not on-link";
1059 break;
1060 case DHCPV6_STATUS_NOPREFIXAVAIL:
1061 status = "no prefix available";
1062 break;
1063 }
1064
1065 char leasebuf[256] = "";
1066
1067 if (a) {
1068 struct log_ctxt ctxt = {.buf = leasebuf,
1069 .buf_len = sizeof(leasebuf),
1070 .buf_idx = 0 };
1071
1072 dhcpv6_ia_enum_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1073 }
1074
1075 syslog(LOG_WARNING, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1076 duidbuf, iface->name, status, leasebuf);
1077 }
1078
1079 static bool dhcpv6_ia_on_link(const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
1080 struct interface *iface)
1081 {
1082 struct odhcpd_ipaddr *addrs = (a && a->managed) ? a->managed : iface->addr6;
1083 size_t addrlen = (a && a->managed) ? (size_t)a->managed_size : iface->addr6_len;
1084 time_t now = odhcpd_time();
1085 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
1086 uint16_t otype, olen;
1087 bool onlink = true;
1088
1089 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
1090 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix *)&odata[-4];
1091 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr *)&odata[-4];
1092
1093 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
1094 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
1095 continue;
1096
1097 onlink = false;
1098 for (size_t i = 0; i < addrlen; ++i) {
1099 if (!valid_addr(&addrs[i], now))
1100 continue;
1101
1102 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
1103 if (p->prefix < addrs[i].prefix ||
1104 odhcpd_bmemcmp(&p->addr, &addrs[i].addr.in6, addrs[i].prefix))
1105 continue;
1106
1107 } else if (odhcpd_bmemcmp(&n->addr, &addrs[i].addr.in6, addrs[i].prefix))
1108 continue;
1109
1110 onlink = true;
1111 }
1112
1113 if (!onlink)
1114 break;
1115 }
1116
1117 return onlink;
1118 }
1119
1120 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
1121 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1122 {
1123 struct lease *l;
1124 struct dhcp_assignment *first = NULL;
1125 const struct dhcpv6_client_header *hdr = data;
1126 time_t now = odhcpd_time();
1127 uint16_t otype, olen, clid_len = 0;
1128 uint8_t *start = (uint8_t *)&hdr[1], *odata;
1129 uint8_t *clid_data = NULL, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1130 size_t hostname_len = 0, response_len = 0;
1131 bool notonlink = false, rapid_commit = false, accept_reconf = false;
1132 char duidbuf[261], hostname[256];
1133
1134 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1135 if (otype == DHCPV6_OPT_CLIENTID) {
1136 clid_data = odata;
1137 clid_len = olen;
1138
1139 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1140 memcpy(mac, &odata[8], sizeof(mac));
1141 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1142 memcpy(mac, &odata[4], sizeof(mac));
1143
1144 if (olen <= 130)
1145 odhcpd_hexlify(duidbuf, odata, olen);
1146 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1147 uint8_t fqdn_buf[256];
1148 memcpy(fqdn_buf, odata, olen);
1149 fqdn_buf[olen++] = 0;
1150
1151 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1152 hostname_len = strcspn(hostname, ".");
1153 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1154 accept_reconf = true;
1155 else if (otype == DHCPV6_OPT_RAPID_COMMIT && hdr->msg_type == DHCPV6_MSG_SOLICIT)
1156 rapid_commit = true;
1157 }
1158
1159 if (!clid_data || !clid_len || clid_len > 130)
1160 goto out;
1161
1162 l = config_find_lease_by_duid(clid_data, clid_len);
1163 if (!l)
1164 l = config_find_lease_by_mac(mac);
1165
1166 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1167 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1168 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1169 bool ia_addr_present = false;
1170 if (!is_pd && !is_na)
1171 continue;
1172
1173 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1174 size_t ia_response_len = 0;
1175 uint8_t reqlen = (is_pd) ? 62 : 128;
1176 uint32_t reqhint = 0;
1177
1178 /* Parse request hint for IA-PD */
1179 if (is_pd) {
1180 uint8_t *sdata;
1181 uint16_t stype, slen;
1182 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1183 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1184 continue;
1185
1186 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1187 if (p->prefix) {
1188 reqlen = p->prefix;
1189 reqhint = ntohl(p->addr.s6_addr32[1]);
1190 if (reqlen > 32 && reqlen <= 64)
1191 reqhint &= (1U << (64 - reqlen)) - 1;
1192 }
1193 }
1194
1195 if (reqlen > 64)
1196 reqlen = 64;
1197 } else if (is_na) {
1198 uint8_t *sdata;
1199 uint16_t stype, slen;
1200 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1201 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1202 continue;
1203
1204 ia_addr_present = true;
1205 }
1206 }
1207
1208 /* Find assignment */
1209 struct dhcp_assignment *c, *a = NULL;
1210 list_for_each_entry(c, &iface->ia_assignments, head) {
1211 if ((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) &&
1212 c->iaid == ia->iaid && (INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1213 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1214 a = c;
1215
1216 /* Reset state */
1217 if (a->flags & OAF_BOUND)
1218 apply_lease(iface, a, false);
1219
1220 stop_reconf(a);
1221 break;
1222 }
1223 }
1224
1225 if (l && a && a->lease != l) {
1226 free_assignment(a);
1227 a = NULL;
1228 }
1229
1230 /* Generic message handling */
1231 uint16_t status = DHCPV6_STATUS_OK;
1232 if (a && a->managed_size < 0)
1233 return -1;
1234
1235 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1236 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1237 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1238 bool assigned = !!a;
1239
1240 if (!a) {
1241 if ((!iface->no_dynamic_dhcp || (l && is_na)) &&
1242 (iface->dhcpv6_pd || iface->dhcpv6_na)) {
1243 /* Create new binding */
1244 a = calloc(1, sizeof(*a) + clid_len);
1245
1246 if (a) {
1247 a->clid_len = clid_len;
1248 memcpy(a->clid_data, clid_data, clid_len);
1249 a->iaid = ia->iaid;
1250 a->length = reqlen;
1251 a->peer = *addr;
1252 a->assigned = is_na && l ? l->hostid : reqhint;
1253 /* Set valid time to 0 for static lease indicating */
1254 /* infinite lifetime otherwise current time */
1255 a->valid_until = l ? 0 : now;
1256 a->dhcp_free_cb = dhcpv6_ia_free_assignment;
1257 a->iface = iface;
1258 a->flags = OAF_DHCPV6;
1259
1260 if (first)
1261 memcpy(a->key, first->key, sizeof(a->key));
1262 else
1263 odhcpd_urandom(a->key, sizeof(a->key));
1264
1265 if (is_pd && iface->dhcpv6_pd)
1266 while (!(assigned = assign_pd(iface, a)) &&
1267 !a->managed_size && ++a->length <= 64);
1268 else if (is_na && iface->dhcpv6_na)
1269 assigned = assign_na(iface, a);
1270
1271 if (l && assigned) {
1272 a->flags |= OAF_STATIC;
1273
1274 if (l->hostname)
1275 a->hostname = strdup(l->hostname);
1276
1277 if (l->leasetime)
1278 a->leasetime = l->leasetime;
1279
1280 list_add(&a->lease_list, &l->assignments);
1281 a->lease = l;
1282 }
1283
1284 if (a->managed_size && !assigned)
1285 return -1;
1286 }
1287 }
1288 }
1289
1290 if (!assigned || iface->addr6_len == 0)
1291 /* Set error status */
1292 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1293 else if (hdr->msg_type == DHCPV6_MSG_REQUEST && !dhcpv6_ia_on_link(ia, a, iface)) {
1294 /* Send NOTONLINK staus for the IA */
1295 status = DHCPV6_STATUS_NOTONLINK;
1296 assigned = false;
1297 } else if (accept_reconf && assigned && !first &&
1298 hdr->msg_type != DHCPV6_MSG_REBIND) {
1299 size_t handshake_len = 4;
1300 buf[0] = 0;
1301 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1302 buf[2] = 0;
1303 buf[3] = 0;
1304
1305 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1306 struct dhcpv6_auth_reconfigure auth = {
1307 htons(DHCPV6_OPT_AUTH),
1308 htons(sizeof(auth) - 4),
1309 3, 1, 0,
1310 {htonl(time(NULL)), htonl(++serial)},
1311 1,
1312 {0}
1313 };
1314 memcpy(auth.key, a->key, sizeof(a->key));
1315 memcpy(buf + handshake_len, &auth, sizeof(auth));
1316 handshake_len += sizeof(auth);
1317 }
1318
1319
1320 buf += handshake_len;
1321 buflen -= handshake_len;
1322 response_len += handshake_len;
1323
1324 first = a;
1325 }
1326
1327 ia_response_len = build_ia(buf, buflen, status, ia, a, iface,
1328 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1329
1330 /* Was only a solicitation: mark binding for removal */
1331 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT && !rapid_commit) {
1332 a->flags &= ~OAF_BOUND;
1333 a->flags |= OAF_TENTATIVE;
1334
1335 if (!(a->flags & OAF_STATIC))
1336 /* Keep tentative assignment around for 60 seconds */
1337 a->valid_until = now + 60;
1338
1339 } else if (assigned &&
1340 ((hdr->msg_type == DHCPV6_MSG_SOLICIT && rapid_commit) ||
1341 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1342 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1343 if ((!(a->flags & OAF_STATIC) || !a->hostname) && hostname_len > 0) {
1344 a->hostname = realloc(a->hostname, hostname_len + 1);
1345 if (a->hostname) {
1346 memcpy(a->hostname, hostname, hostname_len);
1347 a->hostname[hostname_len] = 0;
1348
1349 if (odhcpd_valid_hostname(a->hostname))
1350 a->flags &= ~OAF_BROKEN_HOSTNAME;
1351 else
1352 a->flags |= OAF_BROKEN_HOSTNAME;
1353 }
1354 }
1355 a->accept_reconf = accept_reconf;
1356 a->flags &= ~OAF_TENTATIVE;
1357 a->flags |= OAF_BOUND;
1358 apply_lease(iface, a, true);
1359 } else if (!assigned && a && a->managed_size == 0) {
1360 /* Cleanup failed assignment */
1361 free_assignment(a);
1362 a = NULL;
1363 }
1364 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1365 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1366 hdr->msg_type == DHCPV6_MSG_REBIND ||
1367 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1368 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1369 status = DHCPV6_STATUS_NOBINDING;
1370 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1371 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1372 hdr->msg_type == DHCPV6_MSG_REBIND) {
1373 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1374 if (a) {
1375 a->flags |= OAF_BOUND;
1376 apply_lease(iface, a, true);
1377 }
1378 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1379 if (!(a->flags & OAF_STATIC))
1380 a->valid_until = now - 1;
1381
1382 if (a->flags & OAF_BOUND) {
1383 apply_lease(iface, a, false);
1384 a->flags &= ~OAF_BOUND;
1385 }
1386 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1387 a->flags &= ~OAF_BOUND;
1388
1389 if (!(a->flags & OAF_STATIC)) {
1390 a->clid_len = 0;
1391 a->valid_until = now + 3600; /* Block address for 1h */
1392 }
1393 }
1394 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM) {
1395 if (ia_addr_present && !dhcpv6_ia_on_link(ia, a, iface)) {
1396 notonlink = true;
1397 break;
1398 }
1399
1400 if (!ia_addr_present || !a || !(a->flags & OAF_BOUND)) {
1401 response_len = 0;
1402 goto out;
1403 }
1404 }
1405
1406 buf += ia_response_len;
1407 buflen -= ia_response_len;
1408 response_len += ia_response_len;
1409 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1410 }
1411
1412 switch (hdr->msg_type) {
1413 case DHCPV6_MSG_RELEASE:
1414 case DHCPV6_MSG_DECLINE:
1415 case DHCPV6_MSG_CONFIRM:
1416 if (response_len + 6 < buflen) {
1417 buf[0] = 0;
1418 buf[1] = DHCPV6_OPT_STATUS;
1419 buf[2] = 0;
1420 buf[3] = 2;
1421 buf[4] = 0;
1422 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1423 response_len += 6;
1424 }
1425 break;
1426
1427 default:
1428 break;
1429 }
1430
1431 dhcpv6_ia_write_statefile();
1432
1433 out:
1434 return response_len;
1435 }
OpenWrt DHCP Server