projects / project / odhcpd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
treewide: optimize syslog priority values
[project/odhcpd.git] / src / dhcpv6-ia.c
1 /**
2 * Copyright (C) 2013 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2016 Hans Dedecker <dedeckeh@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #include "odhcpd.h"
17 #include "dhcpv6.h"
18 #include "dhcpv4.h"
19
20 #include <time.h>
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <stdio.h>
24 #include <poll.h>
25 #include <alloca.h>
26 #include <resolv.h>
27 #include <limits.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <stdbool.h>
32 #include <arpa/inet.h>
33 #include <sys/timerfd.h>
34
35 #include <libubox/md5.h>
36 #include <libubox/usock.h>
37
38 #define ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) \
39 ((iface)->dhcpv6_assignall || (i) == (m) || \
40 (addrs)[(i)].prefix > 64)
41
42 static void dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info);
43 static void set_border_assignment_size(struct interface *iface, struct dhcp_assignment *b);
44 static void handle_addrlist_change(struct netevent_handler_info *info);
45 static void start_reconf(struct dhcp_assignment *a);
46 static void stop_reconf(struct dhcp_assignment *a);
47 static void valid_until_cb(struct uloop_timeout *event);
48
49 static struct netevent_handler dhcpv6_netevent_handler = { .cb = dhcpv6_netevent_cb, };
50 static struct uloop_timeout valid_until_timeout = {.cb = valid_until_cb};
51 static uint32_t serial = 0;
52 static uint8_t statemd5[16];
53
54 int dhcpv6_ia_init(void)
55 {
56 uloop_timeout_set(&valid_until_timeout, 1000);
57
58 netlink_add_netevent_handler(&dhcpv6_netevent_handler);
59
60 return 0;
61 }
62
63 int dhcpv6_ia_setup_interface(struct interface *iface, bool enable)
64 {
65 enable = enable && (iface->dhcpv6 == MODE_SERVER);
66
67 if (enable) {
68 struct dhcp_assignment *border;
69
70 if (list_empty(&iface->ia_assignments)) {
71 border = alloc_assignment(0);
72
73 if (!border) {
74 syslog(LOG_WARNING, "Failed to alloc border on %s", iface->name);
75 return -1;
76 }
77
78 border->length = 64;
79 list_add(&border->head, &iface->ia_assignments);
80 } else
81 border = list_last_entry(&iface->ia_assignments, struct dhcp_assignment, head);
82
83 set_border_assignment_size(iface, border);
84 } else {
85 struct dhcp_assignment *c;
86
87 while (!list_empty(&iface->ia_assignments)) {
88 c = list_first_entry(&iface->ia_assignments, struct dhcp_assignment, head);
89 free_assignment(c);
90 }
91 }
92
93 return 0;
94 }
95
96
97 static void dhcpv6_netevent_cb(unsigned long event, struct netevent_handler_info *info)
98 {
99 struct interface *iface = info->iface;
100
101 if (!iface || iface->dhcpv6 != MODE_SERVER)
102 return;
103
104 switch (event) {
105 case NETEV_ADDR6LIST_CHANGE:
106 handle_addrlist_change(info);
107 break;
108 default:
109 break;
110 }
111 }
112
113
114 static inline bool valid_prefix_length(const struct dhcp_assignment *a, const uint8_t prefix_length)
115 {
116 return (a->managed_size || a->length > prefix_length);
117 }
118
119 static inline bool valid_addr(const struct odhcpd_ipaddr *addr, time_t now)
120 {
121 return (addr->prefix <= 96 && addr->preferred > (uint32_t)now);
122 }
123
124 static size_t get_preferred_addr(const struct odhcpd_ipaddr *addrs, const size_t addrlen)
125 {
126 size_t i, m;
127
128 for (i = 0, m = 0; i < addrlen; ++i) {
129 if (addrs[i].preferred > addrs[m].preferred ||
130 (addrs[i].preferred == addrs[m].preferred &&
131 memcmp(&addrs[i].addr, &addrs[m].addr, 16) > 0))
132 m = i;
133 }
134
135 return m;
136 }
137
138 static int send_reconf(struct dhcp_assignment *assign)
139 {
140 struct {
141 struct dhcpv6_client_header hdr;
142 uint16_t srvid_type;
143 uint16_t srvid_len;
144 uint16_t duid_type;
145 uint16_t hardware_type;
146 uint8_t mac[6];
147 uint16_t msg_type;
148 uint16_t msg_len;
149 uint8_t msg_id;
150 struct dhcpv6_auth_reconfigure auth;
151 uint16_t clid_type;
152 uint16_t clid_len;
153 uint8_t clid_data[128];
154 } __attribute__((packed)) reconf_msg = {
155 .hdr = {DHCPV6_MSG_RECONFIGURE, {0, 0, 0}},
156 .srvid_type = htons(DHCPV6_OPT_SERVERID),
157 .srvid_len = htons(10),
158 .duid_type = htons(3),
159 .hardware_type = htons(1),
160 .msg_type = htons(DHCPV6_OPT_RECONF_MSG),
161 .msg_len = htons(1),
162 .msg_id = DHCPV6_MSG_RENEW,
163 .auth = {htons(DHCPV6_OPT_AUTH),
164 htons(sizeof(reconf_msg.auth) - 4), 3, 1, 0,
165 {htonl(time(NULL)), htonl(++serial)}, 2, {0}},
166 .clid_type = htons(DHCPV6_OPT_CLIENTID),
167 .clid_len = htons(assign->clid_len),
168 .clid_data = {0},
169 };
170 struct interface *iface = assign->iface;
171
172 odhcpd_get_mac(iface, reconf_msg.mac);
173 memcpy(reconf_msg.clid_data, assign->clid_data, assign->clid_len);
174 struct iovec iov = {&reconf_msg, sizeof(reconf_msg) - 128 + assign->clid_len};
175
176 md5_ctx_t md5;
177 uint8_t secretbytes[64];
178 memset(secretbytes, 0, sizeof(secretbytes));
179 memcpy(secretbytes, assign->key, sizeof(assign->key));
180
181 for (size_t i = 0; i < sizeof(secretbytes); ++i)
182 secretbytes[i] ^= 0x36;
183
184 md5_begin(&md5);
185 md5_hash(secretbytes, sizeof(secretbytes), &md5);
186 md5_hash(iov.iov_base, iov.iov_len, &md5);
187 md5_end(reconf_msg.auth.key, &md5);
188
189 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
190 secretbytes[i] ^= 0x36;
191 secretbytes[i] ^= 0x5c;
192 }
193
194 md5_begin(&md5);
195 md5_hash(secretbytes, sizeof(secretbytes), &md5);
196 md5_hash(reconf_msg.auth.key, 16, &md5);
197 md5_end(reconf_msg.auth.key, &md5);
198
199 return odhcpd_send(iface->dhcpv6_event.uloop.fd, &assign->peer, &iov, 1, iface);
200 }
201
202 static void dhcpv6_ia_free_assignment(struct dhcp_assignment *a)
203 {
204 if (a->managed_sock.fd.registered) {
205 ustream_free(&a->managed_sock.stream);
206 close(a->managed_sock.fd.fd);
207 }
208
209 if (a->reconf_cnt)
210 stop_reconf(a);
211
212 free(a->managed);
213 }
214
215 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c,
216 time_t now, dhcpv6_binding_cb_handler_t func, void *arg)
217 {
218 struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->addr6;
219 size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->addr6_len;
220 size_t m = get_preferred_addr(addrs, addrlen);
221
222 for (size_t i = 0; i < addrlen; ++i) {
223 struct in6_addr addr;
224 uint32_t pref, valid;
225 int prefix = c->managed ? addrs[i].prefix : c->length;
226
227 if (!valid_addr(&addrs[i], now))
228 continue;
229
230 addr = addrs[i].addr.in6;
231 pref = addrs[i].preferred;
232 valid = addrs[i].valid;
233 if (prefix == 128) {
234 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs))
235 continue;
236
237 addr.s6_addr32[3] = htonl(c->assigned);
238 } else {
239 if (!valid_prefix_length(c, addrs[i].prefix))
240 continue;
241
242 addr.s6_addr32[1] |= htonl(c->assigned);
243 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
244 }
245
246 if (pref != UINT32_MAX)
247 pref -= now;
248
249 if (valid != UINT32_MAX)
250 valid -= now;
251
252 func(&addr, prefix, pref, valid, arg);
253 }
254 }
255
256 struct write_ctxt {
257 FILE *fp;
258 md5_ctx_t md5;
259 struct dhcp_assignment *c;
260 struct interface *iface;
261 char *buf;
262 int buf_len;
263 int buf_idx;
264 };
265
266 static void dhcpv6_write_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
267 _unused uint32_t valid, void *arg)
268 {
269 struct write_ctxt *ctxt = (struct write_ctxt *)arg;
270 char ipbuf[INET6_ADDRSTRLEN];
271
272 inet_ntop(AF_INET6, addr, ipbuf, sizeof(ipbuf) - 1);
273
274 if (ctxt->c->length == 128 && ctxt->c->hostname &&
275 !(ctxt->c->flags & OAF_BROKEN_HOSTNAME)) {
276 fputs(ipbuf, ctxt->fp);
277
278 char b[256];
279 if (dn_expand(ctxt->iface->search, ctxt->iface->search + ctxt->iface->search_len,
280 ctxt->iface->search, b, sizeof(b)) > 0)
281 fprintf(ctxt->fp, "\t%s.%s", ctxt->c->hostname, b);
282
283 fprintf(ctxt->fp, "\t%s\n", ctxt->c->hostname);
284 md5_hash(ipbuf, strlen(ipbuf), &ctxt->md5);
285 md5_hash(ctxt->c->hostname, strlen(ctxt->c->hostname), &ctxt->md5);
286 }
287
288 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx,ctxt->buf_len - ctxt->buf_idx,
289 "%s/%d ", ipbuf, prefix);
290 }
291
292 void dhcpv6_ia_write_statefile(void)
293 {
294 struct write_ctxt ctxt;
295
296 md5_begin(&ctxt.md5);
297
298 if (config.dhcp_statefile) {
299 time_t now = odhcpd_time(), wall_time = time(NULL);
300 int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644);
301 char leasebuf[512];
302
303 if (fd < 0)
304 return;
305 int ret;
306 ret = lockf(fd, F_LOCK, 0);
307 if (ret < 0) {
308 close(fd);
309 return;
310 }
311 if (ftruncate(fd, 0) < 0) {}
312
313 ctxt.fp = fdopen(fd, "w");
314 if (!ctxt.fp) {
315 close(fd);
316 return;
317 }
318
319 ctxt.buf = leasebuf;
320 ctxt.buf_len = sizeof(leasebuf);
321
322 avl_for_each_element(&interfaces, ctxt.iface, avl) {
323 if (ctxt.iface->dhcpv6 != MODE_SERVER &&
324 ctxt.iface->dhcpv4 != MODE_SERVER)
325 continue;
326
327 if (ctxt.iface->dhcpv6 == MODE_SERVER) {
328 list_for_each_entry(ctxt.c, &ctxt.iface->ia_assignments, head) {
329 if (!(ctxt.c->flags & OAF_BOUND) || ctxt.c->managed_size < 0)
330 continue;
331
332 char duidbuf[264];
333
334 odhcpd_hexlify(duidbuf, ctxt.c->clid_data, ctxt.c->clid_len);
335
336 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
337 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s %x %s%s %ld %x %u ",
338 ctxt.iface->ifname, duidbuf, ntohl(ctxt.c->iaid),
339 (ctxt.c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
340 (ctxt.c->hostname ? ctxt.c->hostname : "-"),
341 (ctxt.c->valid_until > now ?
342 (ctxt.c->valid_until - now + wall_time) :
343 (INFINITE_VALID(ctxt.c->valid_until) ? -1 : 0)),
344 ctxt.c->assigned, (unsigned)ctxt.c->length);
345
346 if (INFINITE_VALID(ctxt.c->valid_until) || ctxt.c->valid_until > now)
347 dhcpv6_ia_enum_addrs(ctxt.iface, ctxt.c, now,
348 dhcpv6_write_ia_addr, &ctxt);
349
350 ctxt.buf[ctxt.buf_idx - 1] = '\n';
351 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
352 }
353 }
354
355 if (ctxt.iface->dhcpv4 == MODE_SERVER) {
356 struct dhcp_assignment *c;
357
358 list_for_each_entry(c, &ctxt.iface->dhcpv4_assignments, head) {
359 if (!(c->flags & OAF_BOUND))
360 continue;
361
362 char ipbuf[INET6_ADDRSTRLEN];
363 char duidbuf[16];
364 odhcpd_hexlify(duidbuf, c->hwaddr, sizeof(c->hwaddr));
365
366 /* iface DUID iaid hostname lifetime assigned length [addrs...] */
367 ctxt.buf_idx = snprintf(ctxt.buf, ctxt.buf_len, "# %s %s ipv4 %s%s %ld %x 32 ",
368 ctxt.iface->ifname, duidbuf,
369 (c->flags & OAF_BROKEN_HOSTNAME) ? "broken\\x20" : "",
370 (c->hostname ? c->hostname : "-"),
371 (c->valid_until > now ?
372 (c->valid_until - now + wall_time) :
373 (INFINITE_VALID(c->valid_until) ? -1 : 0)),
374 ntohl(c->addr));
375
376 struct in_addr addr = {.s_addr = c->addr};
377 inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1);
378
379 if (c->hostname && !(c->flags & OAF_BROKEN_HOSTNAME)) {
380 fputs(ipbuf, ctxt.fp);
381
382 char b[256];
383 if (dn_expand(ctxt.iface->search,
384 ctxt.iface->search + ctxt.iface->search_len,
385 ctxt.iface->search, b, sizeof(b)) > 0)
386 fprintf(ctxt.fp, "\t%s.%s", c->hostname, b);
387
388 fprintf(ctxt.fp, "\t%s\n", c->hostname);
389 md5_hash(ipbuf, strlen(ipbuf), &ctxt.md5);
390 md5_hash(c->hostname, strlen(c->hostname), &ctxt.md5);
391 }
392
393 ctxt.buf_idx += snprintf(ctxt.buf + ctxt.buf_idx,
394 ctxt.buf_len - ctxt.buf_idx,
395 "%s/32 ", ipbuf);
396 ctxt.buf[ctxt.buf_idx - 1] = '\n';
397 fwrite(ctxt.buf, 1, ctxt.buf_idx, ctxt.fp);
398 }
399 }
400 }
401
402 fclose(ctxt.fp);
403 }
404
405 uint8_t newmd5[16];
406 md5_end(newmd5, &ctxt.md5);
407
408 if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) {
409 memcpy(statemd5, newmd5, sizeof(statemd5));
410 char *argv[2] = {config.dhcp_cb, NULL};
411 if (!vfork()) {
412 execv(argv[0], argv);
413 _exit(128);
414 }
415 }
416 }
417
418 static void __apply_lease(struct 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 == 0 || 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 (a->clid_len > 0 && !INFINITE_VALID(a->valid_until) && a->valid_until < now)
776 free_assignment(a);
777 }
778 }
779 uloop_timeout_set(event, 1000);
780 }
781
782 static size_t build_ia(uint8_t *buf, size_t buflen, uint16_t status,
783 const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
784 struct interface *iface, bool request)
785 {
786 struct dhcpv6_ia_hdr o_ia = {
787 .type = ia->type,
788 .len = 0,
789 .iaid = ia->iaid,
790 .t1 = 0,
791 .t2 = 0,
792 };
793 size_t ia_len = sizeof(o_ia);
794 time_t now = odhcpd_time();
795
796 if (buflen < ia_len)
797 return 0;
798
799 if (status) {
800 struct __attribute__((packed)) {
801 uint16_t type;
802 uint16_t len;
803 uint16_t val;
804 } o_status = {
805 .type = htons(DHCPV6_OPT_STATUS),
806 .len = htons(sizeof(o_status) - 4),
807 .val = htons(status),
808 };
809
810 memcpy(buf + ia_len, &o_status, sizeof(o_status));
811 ia_len += sizeof(o_status);
812
813 o_ia.len = htons(ia_len - 4);
814 memcpy(buf, &o_ia, sizeof(o_ia));
815
816 return ia_len;
817 }
818
819 if (a) {
820 uint32_t leasetime;
821
822 if (a->leasetime)
823 leasetime = a->leasetime;
824 else
825 leasetime = iface->dhcpv4_leasetime;
826
827 uint32_t pref = leasetime;
828 uint32_t valid = leasetime;
829
830 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
831 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
832 size_t m = get_preferred_addr(addrs, addrlen);
833
834 for (size_t i = 0; i < addrlen; ++i) {
835 uint32_t prefix_pref = addrs[i].preferred;
836 uint32_t prefix_valid = addrs[i].valid;
837
838 if (!valid_addr(&addrs[i], now))
839 continue;
840
841 if (prefix_pref != UINT32_MAX)
842 prefix_pref -= now;
843
844 if (prefix_valid != UINT32_MAX)
845 prefix_valid -= now;
846
847 if (a->length < 128) {
848 struct dhcpv6_ia_prefix o_ia_p = {
849 .type = htons(DHCPV6_OPT_IA_PREFIX),
850 .len = htons(sizeof(o_ia_p) - 4),
851 .preferred = htonl(prefix_pref),
852 .valid = htonl(prefix_valid),
853 .prefix = (a->managed_size) ? addrs[i].prefix : a->length,
854 .addr = addrs[i].addr.in6,
855 };
856
857 o_ia_p.addr.s6_addr32[1] |= htonl(a->assigned);
858 o_ia_p.addr.s6_addr32[2] = o_ia_p.addr.s6_addr32[3] = 0;
859
860 if ((a->assigned == 0 && a->managed_size == 0) ||
861 !valid_prefix_length(a, addrs[i].prefix))
862 continue;
863
864 if (buflen < ia_len + sizeof(o_ia_p))
865 return 0;
866
867 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
868 ia_len += sizeof(o_ia_p);
869 } else {
870 struct dhcpv6_ia_addr o_ia_a = {
871 .type = htons(DHCPV6_OPT_IA_ADDR),
872 .len = htons(sizeof(o_ia_a) - 4),
873 .addr = addrs[i].addr.in6,
874 .preferred = htonl(prefix_pref),
875 .valid = htonl(prefix_valid)
876 };
877
878 o_ia_a.addr.s6_addr32[3] = htonl(a->assigned);
879
880 if (!ADDR_ENTRY_VALID_IA_ADDR(iface, i, m, addrs) ||
881 a->assigned == 0)
882 continue;
883
884 if (buflen < ia_len + sizeof(o_ia_a))
885 return 0;
886
887 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
888 ia_len += sizeof(o_ia_a);
889 }
890
891 /* Calculate T1 / T2 based on non-deprecated addresses */
892 if (prefix_pref > 0) {
893 if (prefix_pref < pref)
894 pref = prefix_pref;
895
896 if (prefix_valid < valid)
897 valid = prefix_valid;
898 }
899 }
900
901 if (!INFINITE_VALID(a->valid_until))
902 /* UINT32_MAX is considered as infinite leasetime */
903 a->valid_until = (valid == UINT32_MAX) ? 0 : valid + now;
904
905 o_ia.t1 = htonl((pref == UINT32_MAX) ? pref : pref * 5 / 10);
906 o_ia.t2 = htonl((pref == UINT32_MAX) ? pref : pref * 8 / 10);
907
908 if (!o_ia.t1)
909 o_ia.t1 = htonl(1);
910
911 if (!o_ia.t2)
912 o_ia.t2 = htonl(1);
913 }
914
915 if (!request) {
916 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
917 uint16_t otype, olen;
918
919 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
920 struct dhcpv6_ia_prefix *ia_p = (struct dhcpv6_ia_prefix *)&odata[-4];
921 struct dhcpv6_ia_addr *ia_a = (struct dhcpv6_ia_addr *)&odata[-4];
922 bool found = false;
923
924 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*ia_p) - 4) &&
925 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*ia_a) - 4))
926 continue;
927
928 if (a) {
929 struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->addr6;
930 size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->addr6_len;
931
932 for (size_t i = 0; i < addrlen; ++i) {
933 if (!valid_addr(&addrs[i], now))
934 continue;
935
936 struct in6_addr addr = addrs[i].addr.in6;
937 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
938 addr.s6_addr32[1] |= htonl(a->assigned);
939 addr.s6_addr32[2] = addr.s6_addr32[3] = 0;
940
941 if (!memcmp(&ia_p->addr, &addr, sizeof(addr)) &&
942 ia_p->prefix == ((a->managed) ? addrs[i].prefix : a->length))
943 found = true;
944 } else {
945 addr.s6_addr32[3] = htonl(a->assigned);
946
947 if (!memcmp(&ia_a->addr, &addr, sizeof(addr)))
948 found = true;
949 }
950 }
951 }
952
953 if (!found) {
954 if (otype == DHCPV6_OPT_IA_PREFIX) {
955 struct dhcpv6_ia_prefix o_ia_p = {
956 .type = htons(DHCPV6_OPT_IA_PREFIX),
957 .len = htons(sizeof(o_ia_p) - 4),
958 .preferred = 0,
959 .valid = 0,
960 .prefix = ia_p->prefix,
961 .addr = ia_p->addr,
962 };
963
964 if (buflen < ia_len + sizeof(o_ia_p))
965 return 0;
966
967 memcpy(buf + ia_len, &o_ia_p, sizeof(o_ia_p));
968 ia_len += sizeof(o_ia_p);
969 } else {
970 struct dhcpv6_ia_addr o_ia_a = {
971 .type = htons(DHCPV6_OPT_IA_ADDR),
972 .len = htons(sizeof(o_ia_a) - 4),
973 .addr = ia_a->addr,
974 .preferred = 0,
975 .valid = 0,
976 };
977
978 if (buflen < ia_len + sizeof(o_ia_a))
979 continue;
980
981 memcpy(buf + ia_len, &o_ia_a, sizeof(o_ia_a));
982 ia_len += sizeof(o_ia_a);
983 }
984 }
985 }
986 }
987
988 o_ia.len = htons(ia_len - 4);
989 memcpy(buf, &o_ia, sizeof(o_ia));
990 return ia_len;
991 }
992
993 struct log_ctxt {
994 char *buf;
995 int buf_len;
996 int buf_idx;
997 };
998
999 static void dhcpv6_log_ia_addr(struct in6_addr *addr, int prefix, _unused uint32_t pref,
1000 _unused uint32_t valid, void *arg)
1001 {
1002 struct log_ctxt *ctxt = (struct log_ctxt *)arg;
1003 char addrbuf[INET6_ADDRSTRLEN];
1004
1005 inet_ntop(AF_INET6, addr, addrbuf, sizeof(addrbuf));
1006 ctxt->buf_idx += snprintf(ctxt->buf + ctxt->buf_idx, ctxt->buf_len - ctxt->buf_idx,
1007 "%s/%d ", addrbuf, prefix);
1008 }
1009
1010 static void dhcpv6_log(uint8_t msgtype, struct interface *iface, time_t now,
1011 const char *duidbuf, bool is_pd, struct dhcp_assignment *a, int code)
1012 {
1013 const char *type = "UNKNOWN";
1014 const char *status = "UNKNOWN";
1015
1016 switch (msgtype) {
1017 case DHCPV6_MSG_SOLICIT:
1018 type = "SOLICIT";
1019 break;
1020 case DHCPV6_MSG_REQUEST:
1021 type = "REQUEST";
1022 break;
1023 case DHCPV6_MSG_CONFIRM:
1024 type = "CONFIRM";
1025 break;
1026 case DHCPV6_MSG_RENEW:
1027 type = "RENEW";
1028 break;
1029 case DHCPV6_MSG_REBIND:
1030 type = "REBIND";
1031 break;
1032 case DHCPV6_MSG_RELEASE:
1033 type = "RELEASE";
1034 break;
1035 case DHCPV6_MSG_DECLINE:
1036 type = "DECLINE";
1037 break;
1038 }
1039
1040 switch (code) {
1041 case DHCPV6_STATUS_OK:
1042 status = "ok";
1043 break;
1044 case DHCPV6_STATUS_NOADDRSAVAIL:
1045 status = "no addresses available";
1046 break;
1047 case DHCPV6_STATUS_NOBINDING:
1048 status = "no binding";
1049 break;
1050 case DHCPV6_STATUS_NOTONLINK:
1051 status = "not on-link";
1052 break;
1053 case DHCPV6_STATUS_NOPREFIXAVAIL:
1054 status = "no prefix available";
1055 break;
1056 }
1057
1058 char leasebuf[256] = "";
1059
1060 if (a) {
1061 struct log_ctxt ctxt = {.buf = leasebuf,
1062 .buf_len = sizeof(leasebuf),
1063 .buf_idx = 0 };
1064
1065 dhcpv6_ia_enum_addrs(iface, a, now, dhcpv6_log_ia_addr, &ctxt);
1066 }
1067
1068 syslog(LOG_INFO, "DHCPV6 %s %s from %s on %s: %s %s", type, (is_pd) ? "IA_PD" : "IA_NA",
1069 duidbuf, iface->name, status, leasebuf);
1070 }
1071
1072 static bool dhcpv6_ia_on_link(const struct dhcpv6_ia_hdr *ia, struct dhcp_assignment *a,
1073 struct interface *iface)
1074 {
1075 struct odhcpd_ipaddr *addrs = (a && a->managed) ? a->managed : iface->addr6;
1076 size_t addrlen = (a && a->managed) ? (size_t)a->managed_size : iface->addr6_len;
1077 time_t now = odhcpd_time();
1078 uint8_t *odata, *end = ((uint8_t*)ia) + htons(ia->len) + 4;
1079 uint16_t otype, olen;
1080 bool onlink = true;
1081
1082 dhcpv6_for_each_option((uint8_t*)&ia[1], end, otype, olen, odata) {
1083 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix *)&odata[-4];
1084 struct dhcpv6_ia_addr *n = (struct dhcpv6_ia_addr *)&odata[-4];
1085
1086 if ((otype != DHCPV6_OPT_IA_PREFIX || olen < sizeof(*p) - 4) &&
1087 (otype != DHCPV6_OPT_IA_ADDR || olen < sizeof(*n) - 4))
1088 continue;
1089
1090 onlink = false;
1091 for (size_t i = 0; i < addrlen; ++i) {
1092 if (!valid_addr(&addrs[i], now))
1093 continue;
1094
1095 if (ia->type == htons(DHCPV6_OPT_IA_PD)) {
1096 if (p->prefix < addrs[i].prefix ||
1097 odhcpd_bmemcmp(&p->addr, &addrs[i].addr.in6, addrs[i].prefix))
1098 continue;
1099
1100 } else if (odhcpd_bmemcmp(&n->addr, &addrs[i].addr.in6, addrs[i].prefix))
1101 continue;
1102
1103 onlink = true;
1104 }
1105
1106 if (!onlink)
1107 break;
1108 }
1109
1110 return onlink;
1111 }
1112
1113 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
1114 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end)
1115 {
1116 struct lease *l;
1117 struct dhcp_assignment *first = NULL;
1118 const struct dhcpv6_client_header *hdr = data;
1119 time_t now = odhcpd_time();
1120 uint16_t otype, olen, clid_len = 0;
1121 uint8_t *start = (uint8_t *)&hdr[1], *odata;
1122 uint8_t *clid_data = NULL, mac[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1123 size_t hostname_len = 0, response_len = 0;
1124 bool notonlink = false, rapid_commit = false, accept_reconf = false;
1125 char duidbuf[261], hostname[256];
1126
1127 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1128 if (otype == DHCPV6_OPT_CLIENTID) {
1129 clid_data = odata;
1130 clid_len = olen;
1131
1132 if (olen == 14 && odata[0] == 0 && odata[1] == 1)
1133 memcpy(mac, &odata[8], sizeof(mac));
1134 else if (olen == 10 && odata[0] == 0 && odata[1] == 3)
1135 memcpy(mac, &odata[4], sizeof(mac));
1136
1137 if (olen <= 130)
1138 odhcpd_hexlify(duidbuf, odata, olen);
1139 } else if (otype == DHCPV6_OPT_FQDN && olen >= 2 && olen <= 255) {
1140 uint8_t fqdn_buf[256];
1141 memcpy(fqdn_buf, odata, olen);
1142 fqdn_buf[olen++] = 0;
1143
1144 if (dn_expand(&fqdn_buf[1], &fqdn_buf[olen], &fqdn_buf[1], hostname, sizeof(hostname)) > 0)
1145 hostname_len = strcspn(hostname, ".");
1146 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT)
1147 accept_reconf = true;
1148 else if (otype == DHCPV6_OPT_RAPID_COMMIT && hdr->msg_type == DHCPV6_MSG_SOLICIT)
1149 rapid_commit = true;
1150 }
1151
1152 if (!clid_data || !clid_len || clid_len > 130)
1153 goto out;
1154
1155 l = config_find_lease_by_duid(clid_data, clid_len);
1156 if (!l)
1157 l = config_find_lease_by_mac(mac);
1158
1159 dhcpv6_for_each_option(start, end, otype, olen, odata) {
1160 bool is_pd = (otype == DHCPV6_OPT_IA_PD);
1161 bool is_na = (otype == DHCPV6_OPT_IA_NA);
1162 bool ia_addr_present = false;
1163 if (!is_pd && !is_na)
1164 continue;
1165
1166 struct dhcpv6_ia_hdr *ia = (struct dhcpv6_ia_hdr*)&odata[-4];
1167 size_t ia_response_len = 0;
1168 uint8_t reqlen = (is_pd) ? 62 : 128;
1169 uint32_t reqhint = 0;
1170
1171 /* Parse request hint for IA-PD */
1172 if (is_pd) {
1173 uint8_t *sdata;
1174 uint16_t stype, slen;
1175 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1176 if (stype != DHCPV6_OPT_IA_PREFIX || slen < sizeof(struct dhcpv6_ia_prefix) - 4)
1177 continue;
1178
1179 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&sdata[-4];
1180 if (p->prefix) {
1181 reqlen = p->prefix;
1182 reqhint = ntohl(p->addr.s6_addr32[1]);
1183 if (reqlen > 32 && reqlen <= 64)
1184 reqhint &= (1U << (64 - reqlen)) - 1;
1185 }
1186 }
1187
1188 if (reqlen > 64)
1189 reqlen = 64;
1190 } else if (is_na) {
1191 uint8_t *sdata;
1192 uint16_t stype, slen;
1193 dhcpv6_for_each_option(&ia[1], odata + olen, stype, slen, sdata) {
1194 if (stype != DHCPV6_OPT_IA_ADDR || slen < sizeof(struct dhcpv6_ia_addr) - 4)
1195 continue;
1196
1197 ia_addr_present = true;
1198 }
1199 }
1200
1201 /* Find assignment */
1202 struct dhcp_assignment *c, *a = NULL;
1203 list_for_each_entry(c, &iface->ia_assignments, head) {
1204 if ((c->clid_len == clid_len && !memcmp(c->clid_data, clid_data, clid_len)) &&
1205 c->iaid == ia->iaid && (INFINITE_VALID(c->valid_until) || now < c->valid_until) &&
1206 ((is_pd && c->length <= 64) || (is_na && c->length == 128))) {
1207 a = c;
1208
1209 /* Reset state */
1210 if (a->flags & OAF_BOUND)
1211 apply_lease(iface, a, false);
1212
1213 stop_reconf(a);
1214 break;
1215 }
1216 }
1217
1218 if (l && a && a->lease != l) {
1219 free_assignment(a);
1220 a = NULL;
1221 }
1222
1223 /* Generic message handling */
1224 uint16_t status = DHCPV6_STATUS_OK;
1225 if (a && a->managed_size < 0)
1226 return -1;
1227
1228 if (hdr->msg_type == DHCPV6_MSG_SOLICIT ||
1229 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1230 (hdr->msg_type == DHCPV6_MSG_REBIND && !a)) {
1231 bool assigned = !!a;
1232
1233 if (!a) {
1234 if ((!iface->no_dynamic_dhcp || (l && is_na)) &&
1235 (iface->dhcpv6_pd || iface->dhcpv6_na)) {
1236 /* Create new binding */
1237 a = alloc_assignment(clid_len);
1238
1239 if (a) {
1240 a->clid_len = clid_len;
1241 memcpy(a->clid_data, clid_data, clid_len);
1242 a->iaid = ia->iaid;
1243 a->length = reqlen;
1244 a->peer = *addr;
1245 a->assigned = is_na && l ? l->hostid : reqhint;
1246 /* Set valid time to 0 for static lease indicating */
1247 /* infinite lifetime otherwise current time */
1248 a->valid_until = l ? 0 : now;
1249 a->dhcp_free_cb = dhcpv6_ia_free_assignment;
1250 a->iface = iface;
1251 a->flags = OAF_DHCPV6;
1252
1253 if (first)
1254 memcpy(a->key, first->key, sizeof(a->key));
1255 else
1256 odhcpd_urandom(a->key, sizeof(a->key));
1257
1258 if (is_pd && iface->dhcpv6_pd)
1259 while (!(assigned = assign_pd(iface, a)) &&
1260 !a->managed_size && ++a->length <= 64);
1261 else if (is_na && iface->dhcpv6_na)
1262 assigned = assign_na(iface, a);
1263
1264 if (l && assigned) {
1265 a->flags |= OAF_STATIC;
1266
1267 if (l->hostname)
1268 a->hostname = strdup(l->hostname);
1269
1270 if (l->leasetime)
1271 a->leasetime = l->leasetime;
1272
1273 list_add(&a->lease_list, &l->assignments);
1274 a->lease = l;
1275 }
1276
1277 if (a->managed_size && !assigned)
1278 return -1;
1279 }
1280 }
1281 }
1282
1283 if (!assigned || iface->addr6_len == 0)
1284 /* Set error status */
1285 status = (is_pd) ? DHCPV6_STATUS_NOPREFIXAVAIL : DHCPV6_STATUS_NOADDRSAVAIL;
1286 else if (hdr->msg_type == DHCPV6_MSG_REQUEST && !dhcpv6_ia_on_link(ia, a, iface)) {
1287 /* Send NOTONLINK staus for the IA */
1288 status = DHCPV6_STATUS_NOTONLINK;
1289 assigned = false;
1290 } else if (accept_reconf && assigned && !first &&
1291 hdr->msg_type != DHCPV6_MSG_REBIND) {
1292 size_t handshake_len = 4;
1293 buf[0] = 0;
1294 buf[1] = DHCPV6_OPT_RECONF_ACCEPT;
1295 buf[2] = 0;
1296 buf[3] = 0;
1297
1298 if (hdr->msg_type == DHCPV6_MSG_REQUEST) {
1299 struct dhcpv6_auth_reconfigure auth = {
1300 htons(DHCPV6_OPT_AUTH),
1301 htons(sizeof(auth) - 4),
1302 3, 1, 0,
1303 {htonl(time(NULL)), htonl(++serial)},
1304 1,
1305 {0}
1306 };
1307 memcpy(auth.key, a->key, sizeof(a->key));
1308 memcpy(buf + handshake_len, &auth, sizeof(auth));
1309 handshake_len += sizeof(auth);
1310 }
1311
1312
1313 buf += handshake_len;
1314 buflen -= handshake_len;
1315 response_len += handshake_len;
1316
1317 first = a;
1318 }
1319
1320 ia_response_len = build_ia(buf, buflen, status, ia, a, iface,
1321 hdr->msg_type == DHCPV6_MSG_REBIND ? false : true);
1322
1323 /* Was only a solicitation: mark binding for removal */
1324 if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT && !rapid_commit) {
1325 a->flags &= ~OAF_BOUND;
1326 a->flags |= OAF_TENTATIVE;
1327
1328 if (!(a->flags & OAF_STATIC))
1329 /* Keep tentative assignment around for 60 seconds */
1330 a->valid_until = now + 60;
1331
1332 } else if (assigned &&
1333 ((hdr->msg_type == DHCPV6_MSG_SOLICIT && rapid_commit) ||
1334 hdr->msg_type == DHCPV6_MSG_REQUEST ||
1335 hdr->msg_type == DHCPV6_MSG_REBIND)) {
1336 if ((!(a->flags & OAF_STATIC) || !a->hostname) && hostname_len > 0) {
1337 a->hostname = realloc(a->hostname, hostname_len + 1);
1338 if (a->hostname) {
1339 memcpy(a->hostname, hostname, hostname_len);
1340 a->hostname[hostname_len] = 0;
1341
1342 if (odhcpd_valid_hostname(a->hostname))
1343 a->flags &= ~OAF_BROKEN_HOSTNAME;
1344 else
1345 a->flags |= OAF_BROKEN_HOSTNAME;
1346 }
1347 }
1348 a->accept_reconf = accept_reconf;
1349 a->flags &= ~OAF_TENTATIVE;
1350 a->flags |= OAF_BOUND;
1351 apply_lease(iface, a, true);
1352 } else if (!assigned && a && a->managed_size == 0) {
1353 /* Cleanup failed assignment */
1354 free_assignment(a);
1355 a = NULL;
1356 }
1357 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1358 hdr->msg_type == DHCPV6_MSG_RELEASE ||
1359 hdr->msg_type == DHCPV6_MSG_REBIND ||
1360 hdr->msg_type == DHCPV6_MSG_DECLINE) {
1361 if (!a && hdr->msg_type != DHCPV6_MSG_REBIND) {
1362 status = DHCPV6_STATUS_NOBINDING;
1363 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1364 } else if (hdr->msg_type == DHCPV6_MSG_RENEW ||
1365 hdr->msg_type == DHCPV6_MSG_REBIND) {
1366 ia_response_len = build_ia(buf, buflen, status, ia, a, iface, false);
1367 if (a) {
1368 a->flags |= OAF_BOUND;
1369 apply_lease(iface, a, true);
1370 }
1371 } else if (hdr->msg_type == DHCPV6_MSG_RELEASE) {
1372 if (!(a->flags & OAF_STATIC))
1373 a->valid_until = now - 1;
1374
1375 if (a->flags & OAF_BOUND) {
1376 apply_lease(iface, a, false);
1377 a->flags &= ~OAF_BOUND;
1378 }
1379 } else if (hdr->msg_type == DHCPV6_MSG_DECLINE && a->length == 128) {
1380 a->flags &= ~OAF_BOUND;
1381
1382 if (!(a->flags & OAF_STATIC)) {
1383 memset(a->clid_data, 0, a->clid_len);
1384 a->valid_until = now + 3600; /* Block address for 1h */
1385 }
1386 }
1387 } else if (hdr->msg_type == DHCPV6_MSG_CONFIRM) {
1388 if (ia_addr_present && !dhcpv6_ia_on_link(ia, a, iface)) {
1389 notonlink = true;
1390 break;
1391 }
1392
1393 if (!ia_addr_present || !a || !(a->flags & OAF_BOUND)) {
1394 response_len = 0;
1395 goto out;
1396 }
1397 }
1398
1399 buf += ia_response_len;
1400 buflen -= ia_response_len;
1401 response_len += ia_response_len;
1402 dhcpv6_log(hdr->msg_type, iface, now, duidbuf, is_pd, a, status);
1403 }
1404
1405 switch (hdr->msg_type) {
1406 case DHCPV6_MSG_RELEASE:
1407 case DHCPV6_MSG_DECLINE:
1408 case DHCPV6_MSG_CONFIRM:
1409 if (response_len + 6 < buflen) {
1410 buf[0] = 0;
1411 buf[1] = DHCPV6_OPT_STATUS;
1412 buf[2] = 0;
1413 buf[3] = 2;
1414 buf[4] = 0;
1415 buf[5] = (notonlink) ? DHCPV6_STATUS_NOTONLINK : DHCPV6_STATUS_OK;
1416 response_len += 6;
1417 }
1418 break;
1419
1420 default:
1421 break;
1422 }
1423
1424 dhcpv6_ia_write_statefile();
1425
1426 out:
1427 return response_len;
1428 }
OpenWrt DHCP Server