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[project/odhcpd.git] / src / dhcpv6-ia.c
1 /**
2 * Copyright (C) 2013 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2016 Hans Dedecker <dedeckeh@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #include "odhcpd.h"
17 #include "dhcpv6.h"
18 #include "dhcpv4.h"
19
20 #include <time.h>
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <stdio.h>
24 #include <poll.h>
25 #include <alloca.h>
26 #include <resolv.h>
27 #include <limits.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <stdbool.h>
32 #include <arpa/inet.h>
33 #include <sys/timerfd.h>
34
35 #include <libubox/md5.h>
36 #include <libubox/usock.h>
37
38 #define ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) \
39 ((iface)->dhcpv6_assignall || (i) == (m) || \
40 (addrs)[(i)].prefix > 64)
41
42 static void dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info);
43 static void set_border_assignment_size(struct interface *iface, struct dhcp_assignment *b);
44 static void handle_addrlist_change(struct netevent_handler_info *info);
45 static void start_reconf(struct dhcp_assignment *a);
46 static void stop_reconf(struct dhcp_assignment *a);
47 static void valid_until_cb(struct uloop_timeout *event);
48
49 static struct netevent_handler dhcpv6_netevent_handler = { .cb = dhcpv6_netevent_cb, };
50 static struct uloop_timeout valid_until_timeout = {.cb = valid_until_cb};
51 static uint32_t serial = 0;
52 static uint8_t statemd5[16];
53
54 int dhcpv6_ia_init(void)
55 {
56 uloop_timeout_set(&valid_until_timeout, 1000);
57
58 netlink_add_netevent_handler(&dhcpv6_netevent_handler);
59
60 return 0;
61 }
62
63 int dhcpv6_ia_setup_interface(struct interface *iface, bool enable)
64 {
65 enable = enable && (iface->dhcpv6 == MODE_SERVER);
66
67 if (enable) {
68 struct dhcp_assignment *border;
69
70 if (list_empty(&iface->ia_assignments)) {
71 border = alloc_assignment(0);
72
73 if (!border) {
74 syslog(LOG_ERR, "Failed to alloc border on %s", iface->name);
75 return -1;
76 }
77
78 border->length = 64;
79 list_add(&border->head, &iface->ia_assignments);
80 } else
81 border = list_last_entry(&iface->ia_assignments, struct dhcp_assignment, head);
82
83 set_border_assignment_size(iface, border);
84 } else {
85 struct dhcp_assignment *c;
86
87 while (!list_empty(&iface->ia_assignments)) {
88 c = list_first_entry(&iface->ia_assignments, struct dhcp_assignment, head);
89 free_assignment(c);
90 }
91 }
92
93 return 0;
94 }
95
96
97 static void dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info)
98 {
99 struct interface *iface = info->iface;
100
101 if (!iface || iface->dhcpv6 != MODE_SERVER)
102 return;
103
104 switch (event) {
105 case NETEV_ADDR6LIST_CHANGE:
106 handle_addrlist_change(info);
107 break;
108 default:
109 break;
110 }
111 }
112
113
114 static inline bool valid_prefix_length(const struct dhcp_assignment *a, const uint8_t prefix_length)
115 {
116 return (a->managed_size || a->length > prefix_length);
117 }
118
119 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
120 {
121 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
122 }
123
124 static size_t get_preferred_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
125 {
126 size_t i, m;
127
128 for (i = 0, m = 0; i < addrlen; ++i) {
129 if (addrs[i].preferred > addrs[m].preferred ||
130 (addrs[i].preferred == addrs[m].preferred &&
131 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
132 m = i;
133 }
134
135 return m;
136 }
137
138 static int send_reconf(struct dhcp_assignment *assign)
139 {
140 struct {
141 struct dhcpv6_client_header hdr;
142 uint16_t srvid_type;
143 uint16_t srvid_len;
144 uint16_t duid_type;
145 uint16_t hardware_type;
146 uint8_t mac[6];
147 uint16_t msg_type;
148 uint16_t msg_len;
149 uint8_t msg_id;
150 struct dhcpv6_auth_reconfigure auth;
151 uint16_t clid_type;
152 uint16_t clid_len;
153 uint8_t clid_data[128];
154 } __attribute__((packed)) reconf_msg = {
155 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
156 .srvid_type = htons(DHCPV6_OPT_SERVERID),
157 .srvid_len = htons(10),
158 .duid_type = htons(3),
159 .hardware_type = htons(1),
160 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
161 .msg_len = htons(1),
162 .msg_id = DHCPV6_MSG_RENEW,
163 .auth = {htons(DHCPV6_OPT_AUTH),
164 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
165 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
166 .clid_type = htons(DHCPV6_OPT_CLIENTID),
167 .clid_len = htons(assign->clid_len),
168 .clid_data = {0},
169 };
170 struct interface *iface = assign->iface;
171
172 odhcpd_get_mac(iface, reconf_msg.mac);
173 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
174 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
175
176 md5_ctx_t md5;
177 uint8_t secretbytes[64];
178 memset(secretbytes, 0, sizeof(secretbytes));
179 memcpy(secretbytes, assign->key, sizeof(assign->key));
180
181 for (size_t i = 0; i < sizeof(secretbytes); ++i)
182 secretbytes[i] ^= 0x36;
183
184 md5_begin(&md5);
185 md5_hash(secretbytes, sizeof(secretbytes), &md5);
186 md5_hash(iov.iov_base, iov.iov_len, &md5);
187 md5_end(reconf_msg.auth.key, &md5);
188
189 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
190 secretbytes[i] ^= 0x36;
191 secretbytes[i] ^= 0x5c;
192 }
193
194 md5_begin(&md5);
195 md5_hash(secretbytes, sizeof(secretbytes), &md5);
196 md5_hash(reconf_msg.auth.key, 16, &md5);
197 md5_end(reconf_msg.auth.key, &md5);
198
199 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
200 }
201
202 static void dhcpv6_ia_free_assignment(struct dhcp_assignment *a)
203 {
204 if (a->managed_sock.fd.registered) {
205 ustream_free(&a->managed_sock.stream);
206 close(a->managed_sock.fd.fd);
207 }
208
209 if (a->reconf_cnt)
210 stop_reconf(a);
211
212 free(a->managed);
213 }
214
215 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c,
216 time_t now, dhcpv6_binding_cb_handler_t func, void *arg)
217 {
218 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->addr6;
219 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->addr6_len;
220 size_t m = get_preferred_addr(addrs, addrlen);
221
222 for (size_t i = 0; i < addrlen; ++i) {
223 struct in6_addr addr;
224 uint32_t pref, valid;
225 int prefix = c->managed ? addrs[i].prefix : c->length;
226
227 if (!valid_addr(&addrs[i], now))
228 continue;
229
230 addr = addrs[i].addr.in6;
231 pref = addrs[i].preferred;
232 valid = addrs[i].valid;
233 if (prefix == 128) {
234 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs))
235 continue;
236
237 addr.s6_addr32[3] = htonl(c->assigned);
238 } else {
239 if (!valid_prefix_length(c, addrs[i].prefix))
240 continue;
241
242 addr.s6_addr32[1] |= htonl(c->assigned);
243 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
244 }
245
246 if (pref != UINT32_MAX)
247 pref -= now;
248
249 if (valid != UINT32_MAX)
250 valid -= now;
251
252 func(&addr, prefix, pref, valid, arg);
253 }
254 }
255
256 struct write_ctxt {
257 FILE *fp;
258 md5_ctx_t md5;
259 struct dhcp_assignment *c;
260 struct interface *iface;
261 char *buf;
262 int buf_len;
263 int buf_idx;
264 };
265
266 static void dhcpv6_write_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
267 _unused uint32_t valid, void *arg)
268 {
269 struct write_ctxt *ctxt = (struct write_ctxt *)arg;
270 char ipbuf[INET6_ADDRSTRLEN];
271
272 inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf) - 1);
273
274 if (ctxt->c->length == 128 && ctxt->c->hostname &&
275 !(ctxt->c->flags & OAF_BROKEN_HOSTNAME)) {
276 fputs(ipbuf, ctxt->fp);
277
278 char b[256];
279 if (dn_expand(ctxt->iface->search, ctxt->iface->search + ctxt->iface->search_len,
280 ctxt->iface->search, b, sizeof(b)) > 0)
281 fprintf(ctxt->fp, "\t%s.%s", ctxt->c->hostname, b);
282
283 fprintf(ctxt->fp, "\t%s\n", ctxt->c->hostname);
284 md5_hash(ipbuf, strlen(ipbuf), &ctxt->md5);
285 md5_hash(ctxt->c->hostname, strlen(ctxt->c->hostname), &ctxt->md5);
286 }
287
288 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx,ctxt->buf_len - ctxt->buf_idx,
289 "%s/%d ", ipbuf, prefix);
290 }
291
292 void dhcpv6_ia_write_statefile(void)
293 {
294 struct write_ctxt ctxt;
295
296 md5_begin(&ctxt.md5);
297
298 if (config.dhcp_statefile) {
299 time_t now = odhcpd_time(), wall_time = time(NULL);
300 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
301 char leasebuf[512];
302
303 if (fd < 0)
304 return;
305 int ret;
306 ret = lockf(fd, F_LOCK, 0);
307 if (ret < 0) {
308 close(fd);
309 return;
310 }
311 if (ftruncate(fd, 0) < 0) {}
312
313 ctxt.fp = fdopen(fd, "w");
314 if (!ctxt.fp) {
315 close(fd);
316 return;
317 }
318
319 ctxt.buf = leasebuf;
320 ctxt.buf_len = sizeof(leasebuf);
321
322 avl_for_each_element(&interfaces, ctxt.iface, avl) {
323 if (ctxt.iface->dhcpv6 != MODE_SERVER &&
324 ctxt.iface->dhcpv4 != MODE_SERVER)
325 continue;
326
327 if (ctxt.iface->dhcpv6 == MODE_SERVER) {
328 list_for_each_entry(ctxt.c, &ctxt.iface->ia_assignments, head) {
329 if (!(ctxt.c->flags & OAF_BOUND) || ctxt.c->managed_size < 0)
330 continue;
331
332 char duidbuf[264];
333
334 odhcpd_hexlify(duidbuf, ctxt.c->clid_data, ctxt.c->clid_len);
335
336 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
337 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s %x %s%s %ld %x %u ",
338 ctxt.iface->ifname, duidbuf, ntohl(ctxt.c->iaid),
339 (ctxt.c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
340 (ctxt.c->hostname ? ctxt.c->hostname : "-"),
341 (ctxt.c->valid_until > now ?
342 (ctxt.c->valid_until - now + wall_time) :
343 (INFINITE_VALID(ctxt.c->valid_until) ? -1 : 0)),
344 ctxt.c->assigned, (unsigned)ctxt.c->length);
345
346 if (INFINITE_VALID(ctxt.c->valid_until) || ctxt.c->valid_until > now)
347 dhcpv6_ia_enum_addrs(ctxt.iface, ctxt.c, now,
348 dhcpv6_write_ia_addr, &ctxt);
349
350 ctxt.buf[ctxt.buf_idx - 1] = '\n';
351 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
352 }
353 }
354
355 if (ctxt.iface->dhcpv4 == MODE_SERVER) {
356 struct dhcp_assignment *c;
357
358 list_for_each_entry(c, &ctxt.iface->dhcpv4_assignments, head) {
359 if (!(c->flags & OAF_BOUND))
360 continue;
361
362 char ipbuf[INET6_ADDRSTRLEN];
363 char duidbuf[16];
364 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
365
366 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
367 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s ipv4 %s%s %ld %x 32 ",
368 ctxt.iface->ifname, duidbuf,
369 (c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
370 (c->hostname ? c->hostname : "-"),
371 (c->valid_until > now ?
372 (c->valid_until - now + wall_time) :
373 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
374 ntohl(c->addr));
375
376 struct in_addr addr = {.s_addr = c->addr};
377 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
378
379 if (c->hostname && !(c->flags & OAF_BROKEN_HOSTNAME)) {
380 fputs(ipbuf, ctxt.fp);
381
382 char b[256];
383 if (dn_expand(ctxt.iface->search,
384 ctxt.iface->search + ctxt.iface->search_len,
385 ctxt.iface->search, b, sizeof(b)) > 0)
386 fprintf(ctxt.fp, "\t%s.%s", c->hostname, b);
387
388 fprintf(ctxt.fp, "\t%s\n", c->hostname);
389 md5_hash(ipbuf, strlen(ipbuf), &ctxt.md5);
390 md5_hash(c->hostname, strlen(c->hostname), &ctxt.md5);
391 }
392
393 ctxt.buf_idx += snprintf(ctxt.buf + ctxt.buf_idx,
394 ctxt.buf_len - ctxt.buf_idx,
395 "%s/32 ", ipbuf);
396 ctxt.buf[ctxt.buf_idx - 1] = '\n';
397 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
398 }
399 }
400 }
401
402 fclose(ctxt.fp);
403 }
404
405 uint8_t newmd5[16];
406 md5_end(newmd5, &ctxt.md5);
407
408 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
409 memcpy(statemd5, newmd5, sizeof(statemd5));
410 char *argv[2] = {config.dhcp_cb, NULL};
411 if (!vfork()) {
412 execv(argv[0], argv);
413 _exit(128);
414 }
415 }
416 }
417
418 static void __apply_lease(struct interface *iface, struct dhcp_assignment *a,
419 struct odhcpd_ipaddr *addrs, ssize_t addr_len, bool add)
420 {
421 if (a->length > 64)
422 return;
423
424 for (ssize_t i = 0; i < addr_len; ++i) {
425 struct in6_addr prefix = addrs[i].addr.in6;
426 prefix.s6_addr32[1] |= htonl(a->assigned);
427 prefix.s6_addr32[2] = prefix.s6_addr32[3] = 0;
428 netlink_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length,
429 iface->ifindex, &a->peer.sin6_addr, 1024, add);
430 }
431 }
432
433 static void apply_lease(struct interface *iface, struct dhcp_assignment *a, bool add)
434 {
435 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
436 ssize_t addrlen = (a->managed) ? a->managed_size : (ssize_t)iface->addr6_len;
437
438 __apply_lease(iface, a, addrs, addrlen, add);
439 }
440
441 /* Set border assignment size based on the IPv6 address prefixes */
442 static void set_border_assignment_size(struct interface *iface, struct dhcp_assignment *b)
443 {
444 time_t now = odhcpd_time();
445 int minprefix = -1;
446
447 for (size_t i = 0; i < iface->addr6_len; ++i) {
448 if (iface->addr6[i].preferred > (uint32_t)now &&
449 iface->addr6[i].prefix < 64 &&
450 iface->addr6[i].prefix > minprefix)
451 minprefix = iface->addr6[i].prefix;
452 }
453
454 if (minprefix > 32 && minprefix <= 64)
455 b->assigned = 1U << (64 - minprefix);
456 else
457 b->assigned = 0;
458 }
459
460 /* More data was received from TCP connection */
461 static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new)
462 {
463 struct ustream_fd *fd = container_of(s, struct ustream_fd, stream);
464 struct dhcp_assignment *c = container_of(fd, struct dhcp_assignment, managed_sock);
465 time_t now = odhcpd_time();
466 bool first = c->managed_size < 0;
467
468 for (;;) {
469 int pending;
470 char *data = ustream_get_read_buf(s, &pending);
471 char *end = memmem(data, pending, "\n\n", 2);
472
473 if (!end)
474 break;
475
476 end += 2;
477 end[-1] = 0;
478
479 c->managed_size = 0;
480 if (c->accept_reconf)
481 c->reconf_cnt = 1;
482
483 char *saveptr;
484 for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) {
485 c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed));
486 struct odhcpd_ipaddr *n = &c->managed[c->managed_size];
487
488 char *saveptr2, *x = strtok_r(line, "/", &saveptr2);
489 if (!x || inet_pton(AF_INET6, x, &n->addr) < 1)
490 continue;
491
492 x = strtok_r(NULL, ",", &saveptr2);
493 if (sscanf(x, "%hhu", &n->prefix) < 1)
494 continue;
495
496 x = strtok_r(NULL, ",", &saveptr2);
497 if (sscanf(x, "%u", &n->preferred) < 1)
498 continue;
499
500 x = strtok_r(NULL, ",", &saveptr2);
501 if (sscanf(x, "%u", &n->valid) < 1)
502 continue;
503
504 if (n->preferred > n->valid)
505 continue;
506
507 if (UINT32_MAX - now < n->preferred)
508 n->preferred = UINT32_MAX;
509 else
510 n->preferred += now;
511
512 if (UINT32_MAX - now < n->valid)
513 n->valid = UINT32_MAX;
514 else
515 n->valid += now;
516
517 n->dprefix = 0;
518
519 ++c->managed_size;
520 }
521
522 ustream_consume(s, end - data);
523 }
524
525 if (first && c->managed_size == 0)
526 free_assignment(c);
527 else if (first && !(c->flags & OAF_STATIC))
528 c->valid_until = now + 150;
529 }
530
531
532 /* TCP transmission has ended, either because of success or timeout or other error */
533 static void managed_handle_pd_done(struct ustream *s)
534 {
535 struct ustream_fd *fd = container_of(s, struct ustream_fd, stream);
536 struct dhcp_assignment *c = container_of(fd, struct dhcp_assignment, managed_sock);
537
538 if (!(c->flags & OAF_STATIC))
539 c->valid_until = odhcpd_time() + 15;
540
541 c->managed_size = 0;
542
543 if (c->accept_reconf)
544 c->reconf_cnt = 1;
545 }
546
547 static bool assign_pd(struct interface *iface, struct dhcp_assignment *assign)
548 {
549 struct dhcp_assignment *c;
550
551 if (iface->dhcpv6_pd_manager[0]) {
552 int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL);
553 if (fd >= 0) {
554 struct pollfd pfd = { .fd = fd, .events = POLLIN };
555 char iaidbuf[298];
556
557 odhcpd_hexlify(iaidbuf, assign->clid_data, assign->clid_len);
558
559 assign->managed_sock.stream.notify_read = managed_handle_pd_data;
560 assign->managed_sock.stream.notify_state = managed_handle_pd_done;
561 ustream_fd_init(&assign->managed_sock, fd);
562 ustream_printf(&assign->managed_sock.stream, "%s,%x\n::/%d,0,0\n\n",
563 iaidbuf, assign->iaid, assign->length);
564 ustream_write_pending(&assign->managed_sock.stream);
565 assign->managed_size = -1;
566
567 if (!(assign->flags & OAF_STATIC))
568 assign->valid_until = odhcpd_time() + 15;
569
570 list_add(&assign->head, &iface->ia_assignments);
571
572 /* Wait initial period of up to 250ms for immediate assignment */
573 if (poll(&pfd, 1, 250) < 0) {
574 syslog(LOG_ERR, "poll(): %m");
575 return false;
576 }
577
578 managed_handle_pd_data(&assign->managed_sock.stream, 0);
579
580 if (fcntl(fd, F_GETFL) >= 0 && assign->managed_size > 0)
581 return true;
582 }
583
584 return false;
585 } else if (iface->addr6_len < 1)
586 return false;
587
588 /* Try honoring the hint first */
589 uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1;
590 if (assign->assigned) {
591 list_for_each_entry(c, &iface->ia_assignments, head) {
592 if (c->length == 128 || c->length == 0)
593 continue;
594
595 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
596 list_add_tail(&assign->head, &c->head);
597
598 if (assign->flags & OAF_BOUND)
599 apply_lease(iface, assign, true);
600
601 return true;
602 }
603
604 if (c->assigned != 0)
605 current = (c->assigned + (1 << (64 - c->length)));
606 }
607 }
608
609 /* Fallback to a variable assignment */
610 current = 1;
611 list_for_each_entry(c, &iface->ia_assignments, head) {
612 if (c->length == 128 || c->length == 0)
613 continue;
614
615 current = (current + asize) & (~asize);
616 if (current + asize < c->assigned) {
617 assign->assigned = current;
618 list_add_tail(&assign->head, &c->head);
619
620 if (assign->flags & OAF_BOUND)
621 apply_lease(iface, assign, true);
622
623 return true;
624 }
625
626 if (c->assigned != 0)
627 current = (c->assigned + (1 << (64 - c->length)));
628 }
629
630 return false;
631 }
632
633 static bool assign_na(struct interface *iface, struct dhcp_assignment *a)
634 {
635 struct dhcp_assignment *c;
636 uint32_t seed = 0;
637
638 /* Preconfigured assignment by static lease */
639 if (a->assigned) {
640 list_for_each_entry(c, &iface->ia_assignments, head) {
641 if (c->length == 0)
642 continue;
643
644 if (c->assigned > a->assigned || c->length != 128) {
645 list_add_tail(&a->head, &c->head);
646 return true;
647 } else if (c->assigned == a->assigned)
648 return false;
649 }
650 }
651
652 /* Seed RNG with checksum of DUID */
653 for (size_t i = 0; i < a->clid_len; ++i)
654 seed += a->clid_data[i];
655 srand(seed);
656
657 /* Try to assign up to 100x */
658 for (size_t i = 0; i < 100; ++i) {
659 uint32_t try;
660 do try = ((uint32_t)rand()) % 0x0fff; while (try < 0x100);
661
662 if (config_find_lease_by_hostid(try))
663 continue;
664
665 list_for_each_entry(c, &iface->ia_assignments, head) {
666 if (c->length == 0)
667 continue;
668
669 if (c->assigned > try || c->length != 128) {
670 a->assigned = try;
671 list_add_tail(&a->head, &c->head);
672 return true;
673 } else if (c->assigned == try)
674 break;
675 }
676 }
677
678 return false;
679 }
680
681 static void handle_addrlist_change(struct netevent_handler_info *info)
682 {
683 struct interface *iface = info->iface;
684 struct dhcp_assignment *c, *d, *border = list_last_entry(
685 &iface->ia_assignments, struct dhcp_assignment, head);
686 struct list_head reassign = LIST_HEAD_INIT(reassign);
687 time_t now = odhcpd_time();
688
689 list_for_each_entry(c, &iface->ia_assignments, head) {
690 if (c != border && !(iface->ra_flags & ND_RA_FLAG_MANAGED)
691 && (c->flags & OAF_BOUND))
692 __apply_lease(iface, c, info->addrs_old.addrs,
693 info->addrs_old.len, false);
694 }
695
696 set_border_assignment_size(iface, border);
697
698 list_for_each_entry_safe(c, d, &iface->ia_assignments, head) {
699 if (c->clid_len == 0 || (!INFINITE_VALID(c->valid_until) && c->valid_until < now) ||
700 c->managed_size)
701 continue;
702
703 if (c->length < 128 && c->assigned >= border->assigned && c != border)
704 list_move(&c->head, &reassign);
705 else if (c != border && (c->flags & OAF_BOUND))
706 apply_lease(iface, c, true);
707
708 if (c->accept_reconf && c->reconf_cnt == 0) {
709 struct dhcp_assignment *a;
710
711 start_reconf(c);
712
713 /* Leave all other assignments of that client alone */
714 list_for_each_entry(a, &iface->ia_assignments, head)
715 if (a != c && a->clid_len == c->clid_len &&
716 !memcmp(a->clid_data, c->clid_data, a->clid_len))
717 a->reconf_cnt = INT_MAX;
718 }
719 }
720
721 while (!list_empty(&reassign)) {
722 c = list_first_entry(&reassign, struct dhcp_assignment, head);
723 list_del_init(&c->head);
724 if (!assign_pd(iface, c)) {
725 c->assigned = 0;
726 list_add(&c->head, &iface->ia_assignments);
727 }
728 }
729
730 dhcpv6_ia_write_statefile();
731 }
732
733 static void reconf_timeout_cb(struct uloop_timeout *event)
734 {
735 struct dhcp_assignment *a = container_of(event, struct dhcp_assignment, reconf_timer);
736
737 if (a->reconf_cnt > 0 && a->reconf_cnt < DHCPV6_REC_MAX_RC) {
738 send_reconf(a);
739 uloop_timeout_set(&a->reconf_timer,
740 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
741 a->reconf_cnt++;
742 } else
743 stop_reconf(a);
744 }
745
746 static void start_reconf(struct dhcp_assignment *a)
747 {
748 uloop_timeout_set(&a->reconf_timer,
749 DHCPV6_REC_TIMEOUT << a->reconf_cnt);
750 a->reconf_timer.cb = reconf_timeout_cb;
751 a->reconf_cnt++;
752
753 send_reconf(a);
754 }
755
756 static void stop_reconf(struct dhcp_assignment *a)
757 {
758 uloop_timeout_cancel(&a->reconf_timer);
759 a->reconf_cnt = 0;
760 a->reconf_timer.cb = NULL;
761 }
762
763 static void valid_until_cb(struct uloop_timeout *event)
764 {
765 struct interface *iface;
766 time_t now = odhcpd_time();
767
768 avl_for_each_element(&interfaces, iface, avl) {
769 struct dhcp_assignment *a, *n;
770
771 if (iface->dhcpv6 != MODE_SERVER)
772 continue;
773
774 list_for_each_entry_safe(a, n, &iface->ia_assignments, head) {
775 if (!INFINITE_VALID(a->valid_until) && a->valid_until < now) {
776 if ((a->length < 128 && a->clid_len > 0) ||
777 (a->length == 128 && a->clid_len == 0))
778 free_assignment(a);
779
780 }
781 }
782 }
783 uloop_timeout_set(event, 1000);
784 }
785
786 static size_t build_ia(uint8_t *buf, size_t buflen, uint16_t status,
787 const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
788 struct interface *iface, bool request)
789 {
790 struct dhcpv6_ia_hdr o_ia = {
791 .type = ia->type,
792 .len = 0,
793 .iaid = ia->iaid,
794 .t1 = 0,
795 .t2 = 0,
796 };
797 size_t ia_len = sizeof(o_ia);
798 time_t now = odhcpd_time();
799
800 if (buflen < ia_len)
801 return 0;
802
803 if (status) {
804 struct __attribute__((packed)) {
805 uint16_t type;
806 uint16_t len;
807 uint16_t val;
808 } o_status = {
809 .type = htons(DHCPV6_OPT_STATUS),
810 .len = htons(sizeof(o_status) - 4),
811 .val = htons(status),
812 };
813
814 memcpy(buf + ia_len, &o_status, sizeof(o_status));
815 ia_len += sizeof(o_status);
816
817 o_ia.len = htons(ia_len - 4);
818 memcpy(buf, &o_ia, sizeof(o_ia));
819
820 return ia_len;
821 }
822
823 if (a) {
824 uint32_t leasetime;
825
826 if (a->leasetime)
827 leasetime = a->leasetime;
828 else
829 leasetime = iface->dhcpv4_leasetime;
830
831 uint32_t pref = leasetime;
832 uint32_t valid = leasetime;
833
834 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
835 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
836 size_t m = get_preferred_addr(addrs, addrlen);
837
838 for (size_t i = 0; i < addrlen; ++i) {
839 uint32_t prefix_pref = addrs[i].preferred;
840 uint32_t prefix_valid = addrs[i].valid;
841
842 if (!valid_addr(&addrs[i], now))
843 continue;
844
845 if (prefix_pref != UINT32_MAX)
846 prefix_pref -= now;
847
848 if (prefix_valid != UINT32_MAX)
849 prefix_valid -= now;
850
851 if (a->length < 128) {
852 struct dhcpv6_ia_prefix o_ia_p = {
853 .type = htons(DHCPV6_OPT_IA_PREFIX),
854 .len = htons(sizeof(o_ia_p) - 4),
855 .preferred = htonl(prefix_pref),
856 .valid = htonl(prefix_valid),
857 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
858 .addr = addrs[i].addr.in6,
859 };
860
861 o_ia_p.addr.s6_addr32[1] |= htonl(a->assigned);
862 o_ia_p.addr.s6_addr32[2] = o_ia_p.addr.s6_addr32[3] = 0;
863
864 if ((a->assigned == 0 && a->managed_size == 0) ||
865 !valid_prefix_length(a, addrs[i].prefix))
866 continue;
867
868 if (buflen < ia_len + sizeof(o_ia_p))
869 return 0;
870
871 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
872 ia_len += sizeof(o_ia_p);
873 } else {
874 struct dhcpv6_ia_addr o_ia_a = {
875 .type = htons(DHCPV6_OPT_IA_ADDR),
876 .len = htons(sizeof(o_ia_a) - 4),
877 .addr = addrs[i].addr.in6,
878 .preferred = htonl(prefix_pref),
879 .valid = htonl(prefix_valid)
880 };
881
882 o_ia_a.addr.s6_addr32[3] = htonl(a->assigned);
883
884 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
885 a->assigned == 0)
886 continue;
887
888 if (buflen < ia_len + sizeof(o_ia_a))
889 return 0;
890
891 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
892 ia_len += sizeof(o_ia_a);
893 }
894
895 /* Calculate T1 / T2 based on non-deprecated addresses */
896 if (prefix_pref > 0) {
897 if (prefix_pref < pref)
898 pref = prefix_pref;
899
900 if (prefix_valid < valid)
901 valid = prefix_valid;
902 }
903 }
904
905 if (!INFINITE_VALID(a->valid_until))
906 /* UINT32_MAX is considered as infinite leasetime */
907 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
908
909 o_ia.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
910 o_ia.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
911
912 if (!o_ia.t1)
913 o_ia.t1 = htonl(1);
914
915 if (!o_ia.t2)
916 o_ia.t2 = htonl(1);
917 }
918
919 if (!request) {
920 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
921 uint16_t otype, olen;
922
923 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
924 struct dhcpv6_ia_prefix *ia_p = (struct dhcpv6_ia_prefix *)&odata[-4];
925 struct dhcpv6_ia_addr *ia_a = (struct dhcpv6_ia_addr *)&odata[-4];
926 bool found = false;
927
928 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*ia_p) - 4) &&
929 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*ia_a) - 4))
930 continue;
931
932 if (a) {
933 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
934 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
935
936 for (size_t i = 0; i < addrlen; ++i) {
937 if (!valid_addr(&addrs[i], now))
938 continue;
939
940 struct in6_addr addr = addrs[i].addr.in6;
941 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
942 addr.s6_addr32[1] |= htonl(a->assigned);
943 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
944
945 if (!memcmp(&ia_p->addr, &addr, sizeof(addr)) &&
946 ia_p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
947 found = true;
948 } else {
949 addr.s6_addr32[3] = htonl(a->assigned);
950
951 if (!memcmp(&ia_a->addr, &addr, sizeof(addr)))
952 found = true;
953 }
954 }
955 }
956
957 if (!found) {
958 if (otype == DHCPV6_OPT_IA_PREFIX) {
959 struct dhcpv6_ia_prefix o_ia_p = {
960 .type = htons(DHCPV6_OPT_IA_PREFIX),
961 .len = htons(sizeof(o_ia_p) - 4),
962 .preferred = 0,
963 .valid = 0,
964 .prefix = ia_p->prefix,
965 .addr = ia_p->addr,
966 };
967
968 if (buflen < ia_len + sizeof(o_ia_p))
969 return 0;
970
971 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
972 ia_len += sizeof(o_ia_p);
973 } else {
974 struct dhcpv6_ia_addr o_ia_a = {
975 .type = htons(DHCPV6_OPT_IA_ADDR),
976 .len = htons(sizeof(o_ia_a) - 4),
977 .addr = ia_a->addr,
978 .preferred = 0,
979 .valid = 0,
980 };
981
982 if (buflen < ia_len + sizeof(o_ia_a))
983 continue;
984
985 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
986 ia_len += sizeof(o_ia_a);
987 }
988 }
989 }
990 }
991
992 o_ia.len = htons(ia_len - 4);
993 memcpy(buf, &o_ia, sizeof(o_ia));
994 return ia_len;
995 }
996
997 struct log_ctxt {
998 char *buf;
999 int buf_len;
1000 int buf_idx;
1001 };
1002
1003 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
1004 _unused uint32_t valid, void *arg)
1005 {
1006 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
1007 char addrbuf[INET6_ADDRSTRLEN];
1008
1009 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
1010 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
1011 "%s/%d ", addrbuf, prefix);
1012 }
1013
1014 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
1015 const char *duidbuf, bool is_pd, struct dhcp_assignment *a, int code)
1016 {
1017 const char *type = "UNKNOWN";
1018 const char *status = "UNKNOWN";
1019
1020 switch (msgtype) {
1021 case DHCPV6_MSG_SOLICIT:
1022 type = "SOLICIT";
1023 break;
1024 case DHCPV6_MSG_REQUEST:
1025 type = "REQUEST";
1026 break;
1027 case DHCPV6_MSG_CONFIRM:
1028 type = "CONFIRM";
1029 break;
1030 case DHCPV6_MSG_RENEW:
1031 type = "RENEW";
1032 break;
1033 case DHCPV6_MSG_REBIND:
1034 type = "REBIND";
1035 break;
1036 case DHCPV6_MSG_RELEASE:
1037 type = "RELEASE";
1038 break;
1039 case DHCPV6_MSG_DECLINE:
1040 type = "DECLINE";
1041 break;
1042 }
1043
1044 switch (code) {
1045 case DHCPV6_STATUS_OK:
1046 status = "ok";
1047 break;
1048 case DHCPV6_STATUS_NOADDRSAVAIL:
1049 status = "no addresses available";
1050 break;
1051 case DHCPV6_STATUS_NOBINDING:
1052 status = "no binding";
1053 break;
1054 case DHCPV6_STATUS_NOTONLINK:
1055 status = "not on-link";
1056 break;
1057 case DHCPV6_STATUS_NOPREFIXAVAIL:
1058 status = "no prefix available";
1059 break;
1060 }
1061
1062 char leasebuf[256] = "";
1063
1064 if (a) {
1065 struct log_ctxt ctxt = {.buf = leasebuf,
1066 .buf_len = sizeof(leasebuf),
1067 .buf_idx = 0 };
1068
1069 dhcpv6_ia_enum_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1070 }
1071
1072 syslog(LOG_NOTICE, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1073 duidbuf, iface->name, status, leasebuf);
1074 }
1075
1076 static bool dhcpv6_ia_on_link(const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
1077 struct interface *iface)
1078 {
1079 struct odhcpd_ipaddr *addrs = (a && a->managed) ? a->managed : iface->addr6;
1080 size_t addrlen = (a && a->managed) ? (size_t)a->managed_size : iface->addr6_len;
1081 time_t now = odhcpd_time();
1082 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
1083 uint16_t otype, olen;
1084 bool onlink = true;
1085
1086 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
1087 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix *)&odata[-4];
1088 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr *)&odata[-4];
1089
1090 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
1091 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
1092 continue;
1093
1094 onlink = false;
1095 for (size_t i = 0; i < addrlen; ++i) {
1096 if (!valid_addr(&addrs[i], now))
1097 continue;
1098
1099 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
1100 if (p->prefix < addrs[i].prefix ||
1101 odhcpd_bmemcmp(&p->addr, &addrs[i].addr.in6, addrs[i].prefix))
1102 continue;
1103
1104 } else if (odhcpd_bmemcmp(&n->addr, &addrs[i].addr.in6, addrs[i].prefix))
1105 continue;
1106
1107 onlink = true;
1108 }
1109
1110 if (!onlink)
1111 break;
1112 }
1113
1114 return onlink;
1115 }
1116
1117 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
1118 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1119 {
1120 struct lease *l;
1121 struct dhcp_assignment *first = NULL;
1122 const struct dhcpv6_client_header *hdr = data;
1123 time_t now = odhcpd_time();
1124 uint16_t otype, olen, clid_len = 0;
1125 uint8_t *start = (uint8_t *)&hdr[1], *odata;
1126 uint8_t *clid_data = NULL, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1127 size_t hostname_len = 0, response_len = 0;
1128 bool notonlink = false, rapid_commit = false, accept_reconf = false;
1129 char duidbuf[261], hostname[256];
1130
1131 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1132 if (otype == DHCPV6_OPT_CLIENTID) {
1133 clid_data = odata;
1134 clid_len = olen;
1135
1136 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1137 memcpy(mac, &odata[8], sizeof(mac));
1138 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1139 memcpy(mac, &odata[4], sizeof(mac));
1140
1141 if (olen <= 130)
1142 odhcpd_hexlify(duidbuf, odata, olen);
1143 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1144 uint8_t fqdn_buf[256];
1145 memcpy(fqdn_buf, odata, olen);
1146 fqdn_buf[olen++] = 0;
1147
1148 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1149 hostname_len = strcspn(hostname, ".");
1150 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1151 accept_reconf = true;
1152 else if (otype == DHCPV6_OPT_RAPID_COMMIT && hdr->msg_type == DHCPV6_MSG_SOLICIT)
1153 rapid_commit = true;
1154 }
1155
1156 if (!clid_data || !clid_len || clid_len > 130)
1157 goto out;
1158
1159 l = config_find_lease_by_duid(clid_data, clid_len);
1160 if (!l)
1161 l = config_find_lease_by_mac(mac);
1162
1163 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1164 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1165 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1166 bool ia_addr_present = false;
1167 if (!is_pd && !is_na)
1168 continue;
1169
1170 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1171 size_t ia_response_len = 0;
1172 uint8_t reqlen = (is_pd) ? 62 : 128;
1173 uint32_t reqhint = 0;
1174
1175 /* Parse request hint for IA-PD */
1176 if (is_pd) {
1177 uint8_t *sdata;
1178 uint16_t stype, slen;
1179 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1180 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1181 continue;
1182
1183 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1184 if (p->prefix) {
1185 reqlen = p->prefix;
1186 reqhint = ntohl(p->addr.s6_addr32[1]);
1187 if (reqlen > 32 && reqlen <= 64)
1188 reqhint &= (1U << (64 - reqlen)) - 1;
1189 }
1190 }
1191
1192 if (reqlen > 64)
1193 reqlen = 64;
1194 } else if (is_na) {
1195 uint8_t *sdata;
1196 uint16_t stype, slen;
1197 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1198 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1199 continue;
1200
1201 ia_addr_present = true;
1202 }
1203 }
1204
1205 /* Find assignment */
1206 struct dhcp_assignment *c, *a = NULL;
1207 list_for_each_entry(c, &iface->ia_assignments, head) {
1208 if ((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) &&
1209 c->iaid == ia->iaid && (INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1210 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1211 a = c;
1212
1213 /* Reset state */
1214 if (a->flags & OAF_BOUND)
1215 apply_lease(iface, a, false);
1216
1217 stop_reconf(a);
1218 break;
1219 }
1220 }
1221
1222 if (l && a && a->lease != l) {
1223 free_assignment(a);
1224 a = NULL;
1225 }
1226
1227 /* Generic message handling */
1228 uint16_t status = DHCPV6_STATUS_OK;
1229 if (a && a->managed_size < 0)
1230 return -1;
1231
1232 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1233 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1234 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1235 bool assigned = !!a;
1236
1237 if (!a) {
1238 if ((!iface->no_dynamic_dhcp || (l && is_na)) &&
1239 (iface->dhcpv6_pd || iface->dhcpv6_na)) {
1240 /* Create new binding */
1241 a = alloc_assignment(clid_len);
1242
1243 if (a) {
1244 a->clid_len = clid_len;
1245 memcpy(a->clid_data, clid_data, clid_len);
1246 a->iaid = ia->iaid;
1247 a->length = reqlen;
1248 a->peer = *addr;
1249 a->assigned = is_na && l ? l->hostid : reqhint;
1250 /* Set valid time to 0 for static lease indicating */
1251 /* infinite lifetime otherwise current time */
1252 a->valid_until = l ? 0 : now;
1253 a->dhcp_free_cb = dhcpv6_ia_free_assignment;
1254 a->iface = iface;
1255 a->flags = OAF_DHCPV6;
1256
1257 if (first)
1258 memcpy(a->key, first->key, sizeof(a->key));
1259 else
1260 odhcpd_urandom(a->key, sizeof(a->key));
1261
1262 if (is_pd && iface->dhcpv6_pd)
1263 while (!(assigned = assign_pd(iface, a)) &&
1264 !a->managed_size && ++a->length <= 64);
1265 else if (is_na && iface->dhcpv6_na)
1266 assigned = assign_na(iface, a);
1267
1268 if (l && assigned) {
1269 a->flags |= OAF_STATIC;
1270
1271 if (l->hostname)
1272 a->hostname = strdup(l->hostname);
1273
1274 if (l->leasetime)
1275 a->leasetime = l->leasetime;
1276
1277 list_add(&a->lease_list, &l->assignments);
1278 a->lease = l;
1279 }
1280
1281 if (a->managed_size && !assigned)
1282 return -1;
1283 }
1284 }
1285 }
1286
1287 if (!assigned || iface->addr6_len == 0)
1288 /* Set error status */
1289 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1290 else if (hdr->msg_type == DHCPV6_MSG_REQUEST && !dhcpv6_ia_on_link(ia, a, iface)) {
1291 /* Send NOTONLINK staus for the IA */
1292 status = DHCPV6_STATUS_NOTONLINK;
1293 assigned = false;
1294 } else if (accept_reconf && assigned && !first &&
1295 hdr->msg_type != DHCPV6_MSG_REBIND) {
1296 size_t handshake_len = 4;
1297 buf[0] = 0;
1298 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1299 buf[2] = 0;
1300 buf[3] = 0;
1301
1302 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1303 struct dhcpv6_auth_reconfigure auth = {
1304 htons(DHCPV6_OPT_AUTH),
1305 htons(sizeof(auth) - 4),
1306 3, 1, 0,
1307 {htonl(time(NULL)), htonl(++serial)},
1308 1,
1309 {0}
1310 };
1311 memcpy(auth.key, a->key, sizeof(a->key));
1312 memcpy(buf + handshake_len, &auth, sizeof(auth));
1313 handshake_len += sizeof(auth);
1314 }
1315
1316
1317 buf += handshake_len;
1318 buflen -= handshake_len;
1319 response_len += handshake_len;
1320
1321 first = a;
1322 }
1323
1324 ia_response_len = build_ia(buf, buflen, status, ia, a, iface,
1325 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1326
1327 /* Was only a solicitation: mark binding for removal */
1328 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT && !rapid_commit) {
1329 a->flags &= ~OAF_BOUND;
1330 a->flags |= OAF_TENTATIVE;
1331
1332 if (!(a->flags & OAF_STATIC))
1333 /* Keep tentative assignment around for 60 seconds */
1334 a->valid_until = now + 60;
1335
1336 } else if (assigned &&
1337 ((hdr->msg_type == DHCPV6_MSG_SOLICIT && rapid_commit) ||
1338 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1339 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1340 if ((!(a->flags & OAF_STATIC) || !a->hostname) && hostname_len > 0) {
1341 a->hostname = realloc(a->hostname, hostname_len + 1);
1342 if (a->hostname) {
1343 memcpy(a->hostname, hostname, hostname_len);
1344 a->hostname[hostname_len] = 0;
1345
1346 if (odhcpd_valid_hostname(a->hostname))
1347 a->flags &= ~OAF_BROKEN_HOSTNAME;
1348 else
1349 a->flags |= OAF_BROKEN_HOSTNAME;
1350 }
1351 }
1352 a->accept_reconf = accept_reconf;
1353 a->flags &= ~OAF_TENTATIVE;
1354 a->flags |= OAF_BOUND;
1355 apply_lease(iface, a, true);
1356 } else if (!assigned && a && a->managed_size == 0) {
1357 /* Cleanup failed assignment */
1358 free_assignment(a);
1359 a = NULL;
1360 }
1361 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1362 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1363 hdr->msg_type == DHCPV6_MSG_REBIND ||
1364 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1365 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1366 status = DHCPV6_STATUS_NOBINDING;
1367 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1368 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1369 hdr->msg_type == DHCPV6_MSG_REBIND) {
1370 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1371 if (a) {
1372 a->flags |= OAF_BOUND;
1373 apply_lease(iface, a, true);
1374 }
1375 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1376 if (!(a->flags & OAF_STATIC))
1377 a->valid_until = now - 1;
1378
1379 if (a->flags & OAF_BOUND) {
1380 apply_lease(iface, a, false);
1381 a->flags &= ~OAF_BOUND;
1382 }
1383 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1384 a->flags &= ~OAF_BOUND;
1385
1386 if (!(a->flags & OAF_STATIC)) {
1387 a->clid_len = 0;
1388 a->valid_until = now + 3600; /* Block address for 1h */
1389 }
1390 }
1391 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM) {
1392 if (ia_addr_present && !dhcpv6_ia_on_link(ia, a, iface)) {
1393 notonlink = true;
1394 break;
1395 }
1396
1397 if (!ia_addr_present || !a || !(a->flags & OAF_BOUND)) {
1398 response_len = 0;
1399 goto out;
1400 }
1401 }
1402
1403 buf += ia_response_len;
1404 buflen -= ia_response_len;
1405 response_len += ia_response_len;
1406 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1407 }
1408
1409 switch (hdr->msg_type) {
1410 case DHCPV6_MSG_RELEASE:
1411 case DHCPV6_MSG_DECLINE:
1412 case DHCPV6_MSG_CONFIRM:
1413 if (response_len + 6 < buflen) {
1414 buf[0] = 0;
1415 buf[1] = DHCPV6_OPT_STATUS;
1416 buf[2] = 0;
1417 buf[3] = 2;
1418 buf[4] = 0;
1419 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1420 response_len += 6;
1421 }
1422 break;
1423
1424 default:
1425 break;
1426 }
1427
1428 dhcpv6_ia_write_statefile();
1429
1430 out:
1431 return response_len;
1432 }
OpenWrt DHCP Server