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interface-ip: fix subnet route handling
[project/netifd.git] / interface-ip.c
1 /*
2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2012 Steven Barth <steven@midlink.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15 #include <string.h>
16 #include <stdlib.h>
17 #include <stdio.h>
18
19 #include <limits.h>
20 #include <arpa/inet.h>
21 #include <netinet/in.h>
22
23 #include "netifd.h"
24 #include "device.h"
25 #include "interface.h"
26 #include "interface-ip.h"
27 #include "proto.h"
28 #include "ubus.h"
29 #include "system.h"
30
31 enum {
32 ROUTE_INTERFACE,
33 ROUTE_TARGET,
34 ROUTE_MASK,
35 ROUTE_GATEWAY,
36 ROUTE_METRIC,
37 ROUTE_MTU,
38 ROUTE_VALID,
39 ROUTE_TABLE,
40 ROUTE_SOURCE,
41 ROUTE_ONLINK,
42 ROUTE_TYPE,
43 __ROUTE_MAX
44 };
45
46 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
47 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
48 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
49 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
50 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
51 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
52 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
53 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
54 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
55 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
56 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
57 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING }
58 };
59
60 const struct uci_blob_param_list route_attr_list = {
61 .n_params = __ROUTE_MAX,
62 .params = route_attr,
63 };
64
65
66 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
67 static struct device_prefix *ula_prefix = NULL;
68 static struct uloop_timeout valid_until_timeout;
69
70
71 static void
72 clear_if_addr(union if_addr *a, int mask)
73 {
74 int m_bytes = (mask + 7) / 8;
75 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
76 uint8_t *p = (uint8_t *) a;
77
78 if (m_bytes < sizeof(*a))
79 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
80
81 p[m_bytes - 1] &= ~m_clear;
82 }
83
84 static bool
85 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
86 {
87 union if_addr *p1, *p2;
88
89 p1 = alloca(sizeof(*a1));
90 p2 = alloca(sizeof(*a2));
91
92 memcpy(p1, a1, sizeof(*a1));
93 clear_if_addr(p1, mask);
94 memcpy(p2, a2, sizeof(*a2));
95 clear_if_addr(p2, mask);
96
97 return !memcmp(p1, p2, sizeof(*p1));
98 }
99
100 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
101 const union if_addr *addr, uint8_t mask, unsigned int table,
102 struct interface *in_iface, const char *action)
103 {
104 struct iprule rule = {
105 .flags = IPRULE_PRIORITY,
106 .priority = priority
107 };
108
109 if (addr) {
110 rule.flags |= IPRULE_SRC;
111 rule.src_addr = *addr;
112 rule.src_mask = mask;
113 }
114
115 if (table) {
116 rule.flags |= IPRULE_LOOKUP;
117 rule.lookup = table;
118
119 if (!rule.lookup)
120 return 0;
121 } else if (action) {
122 rule.flags |= IPRULE_ACTION;
123 system_resolve_iprule_action(action, &rule.action);
124 }
125
126 if (in_iface && in_iface->l3_dev.dev) {
127 rule.flags |= IPRULE_IN;
128 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
129 }
130
131 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
132
133 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
134 }
135
136 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
137 {
138 struct iprule rule = {
139 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
140 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
141 .lookup = (v6) ? iface->ip6table : iface->ip4table,
142 .in_dev = "lo"
143 };
144
145 if (!rule.lookup)
146 return 0;
147
148 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
149
150 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
151 }
152
153 static bool
154 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
155 {
156 struct device_addr *addr;
157
158 vlist_for_each_element(&ip->addr, addr, node) {
159 if (!addr->enabled)
160 continue;
161
162 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
163 continue;
164
165 // Handle offlink addresses correctly
166 unsigned int mask = addr->mask;
167 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
168 (addr->flags & DEVADDR_OFFLINK))
169 mask = 128;
170
171 if (!match_if_addr(&addr->addr, a, mask))
172 continue;
173
174 return true;
175 }
176
177 return false;
178 }
179
180 static void
181 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
182 bool v6, struct device_route **res)
183 {
184 struct device_route *route;
185
186 vlist_for_each_element(&ip->route, route, node) {
187 if (!route->enabled)
188 continue;
189
190 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
191 continue;
192
193 if (!match_if_addr(&route->addr, a, route->mask))
194 continue;
195
196 if (route->flags & DEVROUTE_TABLE)
197 continue;
198
199 if (!*res || route->mask < (*res)->mask)
200 *res = route;
201 }
202 }
203
204 static bool
205 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
206 {
207 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
208 __find_ip_addr_target(&iface->config_ip, a, v6);
209 }
210
211 static void
212 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
213 bool v6, struct device_route **route)
214 {
215 __find_ip_route_target(&iface->proto_ip, a, v6, route);
216 __find_ip_route_target(&iface->config_ip, a, v6, route);
217 }
218
219 struct interface *
220 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
221 {
222 struct device_route *route, *r_next = NULL;
223 bool defaultroute_target = false;
224 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
225
226 route = calloc(1, sizeof(*route));
227 if (!route)
228 return NULL;
229
230 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
231 route->mask = v6 ? 128 : 32;
232 if (memcmp(&route->addr, addr, addrsize) == 0)
233 defaultroute_target = true;
234 else
235 memcpy(&route->addr, addr, addrsize);
236
237 if (iface) {
238 /* look for locally addressable target first */
239 if (interface_ip_find_addr_target(iface, addr, v6))
240 goto done;
241
242 /* do not stop at the first route, let the lookup compare
243 * masks to find the best match */
244 interface_ip_find_route_target(iface, addr, v6, &r_next);
245 } else {
246 vlist_for_each_element(&interfaces, iface, node) {
247 /* look for locally addressable target first */
248 if (interface_ip_find_addr_target(iface, addr, v6))
249 goto done;
250
251 /* do not stop at the first route, let the lookup compare
252 * masks to find the best match */
253 interface_ip_find_route_target(iface, addr, v6, &r_next);
254 }
255 }
256
257 if (!r_next) {
258 free(route);
259 return NULL;
260 }
261
262 iface = r_next->iface;
263 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
264 route->mtu = r_next->mtu;
265 route->metric = r_next->metric;
266 route->table = r_next->table;
267
268 done:
269 route->iface = iface;
270 if (defaultroute_target)
271 free(route);
272 else
273 vlist_add(&iface->host_routes, &route->node, route);
274 return iface;
275 }
276
277 void
278 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
279 {
280 struct interface_ip_settings *ip;
281 struct blob_attr *tb[__ROUTE_MAX], *cur;
282 struct device_route *route;
283 int af = v6 ? AF_INET6 : AF_INET;
284 bool is_proto_route = !!iface;
285
286 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
287
288 if (!iface) {
289 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
290 return;
291
292 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
293 if (!iface)
294 return;
295
296 ip = &iface->config_ip;
297 } else {
298 ip = &iface->proto_ip;
299 }
300
301 route = calloc(1, sizeof(*route));
302 if (!route)
303 return;
304
305 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
306 route->mask = v6 ? 128 : 32;
307 if ((cur = tb[ROUTE_MASK]) != NULL) {
308 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
309 if (route->mask > (v6 ? 128 : 32))
310 goto error;
311 }
312
313 if ((cur = tb[ROUTE_TARGET]) != NULL) {
314 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
315 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
316 goto error;
317 }
318 }
319
320 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
321 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
322 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
323 goto error;
324 }
325 }
326
327 if ((cur = tb[ROUTE_METRIC]) != NULL) {
328 route->metric = blobmsg_get_u32(cur);
329 route->flags |= DEVROUTE_METRIC;
330 } else
331 route->metric = iface->metric;
332
333 if ((cur = tb[ROUTE_MTU]) != NULL) {
334 route->mtu = blobmsg_get_u32(cur);
335 route->flags |= DEVROUTE_MTU;
336 }
337
338 // Use source-based routing
339 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
340 char *saveptr, *source = alloca(blobmsg_data_len(cur));
341 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
342
343 const char *addr = strtok_r(source, "/", &saveptr);
344 const char *mask = strtok_r(NULL, "/", &saveptr);
345
346 if (!addr || inet_pton(af, addr, &route->source) < 1) {
347 DPRINTF("Failed to parse route source: %s\n", addr);
348 goto error;
349 }
350
351 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
352 }
353
354 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
355 route->flags |= DEVROUTE_ONLINK;
356
357 if (is_proto_route) {
358 route->table = (v6) ? iface->ip6table : iface->ip4table;
359 route->flags |= DEVROUTE_SRCTABLE;
360 }
361
362 if ((cur = tb[ROUTE_TABLE]) != NULL) {
363 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
364 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
365 goto error;
366 }
367
368 /* only set the table flag if not using the main (default) table */
369 if (system_is_default_rt_table(route->table))
370 route->table = 0;
371
372 if (route->table)
373 route->flags |= DEVROUTE_TABLE;
374 }
375
376 if ((cur = tb[ROUTE_VALID]) != NULL) {
377 int64_t valid = blobmsg_get_u32(cur);
378 int64_t valid_until = valid + (int64_t)system_get_rtime();
379 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
380 route->valid_until = valid_until;
381 }
382
383 if ((cur = tb[ROUTE_TYPE]) != NULL) {
384 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
385 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
386 goto error;
387 }
388 route->flags |= DEVROUTE_TYPE;
389 }
390
391 vlist_add(&ip->route, &route->node, route);
392 return;
393
394 error:
395 free(route);
396 }
397
398 static int
399 addr_cmp(const void *k1, const void *k2, void *ptr)
400 {
401 return memcmp(k1, k2, sizeof(struct device_addr) -
402 offsetof(struct device_addr, flags));
403 }
404
405 static int
406 route_cmp(const void *k1, const void *k2, void *ptr)
407 {
408 const struct device_route *r1 = k1, *r2 = k2;
409
410 if (r1->mask != r2->mask)
411 return r2->mask - r1->mask;
412
413 if (r1->metric != r2->metric)
414 return r1->metric - r2->metric;
415
416 if (r1->flags != r2->flags)
417 return r2->flags - r1->flags;
418
419 if (r1->sourcemask != r2->sourcemask)
420 return r1->sourcemask - r2->sourcemask;
421
422 if (r1->table != r2->table)
423 return r1->table - r2->table;
424
425 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
426 if (maskcmp)
427 return maskcmp;
428
429 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
430 }
431
432 static int
433 prefix_cmp(const void *k1, const void *k2, void *ptr)
434 {
435 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
436 offsetof(struct device_prefix, addr));
437 }
438
439 static void
440 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
441 {
442 struct device *dev = iface->l3_dev.dev;
443 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
444 struct device_route *r = &addr->subnet;
445
446 if (addr->flags & DEVADDR_OFFLINK)
447 return;
448
449 if (!add) {
450 if (!addr->subnet.iface)
451 return;
452
453 system_del_route(dev, r);
454 memset(r, 0, sizeof(*r));
455 return;
456 }
457
458 r->iface = iface;
459 r->flags = addr->flags;
460 r->mask = addr->mask;
461 memcpy(&r->addr, &addr->addr, sizeof(r->addr));
462 clear_if_addr(&r->addr, r->mask);
463
464 r->flags |= DEVADDR_KERNEL;
465 system_del_route(dev, r);
466
467 r->flags &= ~DEVADDR_KERNEL;
468 r->metric = iface->metric;
469 r->table = (v6) ? iface->ip6table : iface->ip4table;
470 if (r->table)
471 r->flags |= DEVROUTE_SRCTABLE;
472
473 system_add_route(dev, r);
474 }
475
476 static void
477 interface_update_proto_addr(struct vlist_tree *tree,
478 struct vlist_node *node_new,
479 struct vlist_node *node_old)
480 {
481 struct interface_ip_settings *ip;
482 struct interface *iface;
483 struct device *dev;
484 struct device_addr *a_new = NULL, *a_old = NULL;
485 bool replace = false;
486 bool keep = false;
487 bool v6 = false;
488
489 ip = container_of(tree, struct interface_ip_settings, addr);
490 iface = ip->iface;
491 dev = iface->l3_dev.dev;
492
493 if (!node_new || !node_old)
494 iface->updated |= IUF_ADDRESS;
495
496 if (node_new) {
497 a_new = container_of(node_new, struct device_addr, node);
498
499 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
500 !a_new->broadcast) {
501
502 /* /31 and /32 addressing need 255.255.255.255
503 * as broadcast address. */
504 if (a_new->mask >= 31) {
505 a_new->broadcast = (uint32_t) ~0;
506 } else {
507 uint32_t mask = ~0;
508 uint32_t *a = (uint32_t *) &a_new->addr;
509
510 mask >>= a_new->mask;
511 a_new->broadcast = *a | htonl(mask);
512 }
513 }
514 }
515
516 if (node_old)
517 a_old = container_of(node_old, struct device_addr, node);
518
519 if (a_new && a_old) {
520 keep = true;
521
522 if (a_old->flags != a_new->flags || a_old->failed)
523 keep = false;
524
525 if (a_old->valid_until != a_new->valid_until ||
526 a_old->preferred_until != a_new->preferred_until)
527 replace = true;
528
529 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
530 a_new->broadcast != a_old->broadcast)
531 keep = false;
532 }
533
534 if (node_old) {
535 if (a_old->enabled && !keep) {
536 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
537 v6 = true;
538
539 //This is needed for source routing to work correctly. If a device
540 //has two connections to a network using the same subnet, adding
541 //only the network-rule will cause packets to be routed through the
542 //first matching network (source IP matches both masks).
543 if (a_old->policy_table)
544 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
545 (v6) ? 128 : 32, a_old->policy_table, NULL, NULL);
546
547 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
548 interface_handle_subnet_route(iface, a_old, false);
549 system_del_address(dev, a_old);
550 }
551 }
552 free(a_old->pclass);
553 free(a_old);
554 }
555
556 if (node_new) {
557 a_new->enabled = true;
558
559 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
560 v6 = true;
561
562 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
563
564 if (!keep || replace) {
565 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
566 if (system_add_address(dev, a_new))
567 a_new->failed = true;
568
569 if (iface->metric || a_new->policy_table)
570 interface_handle_subnet_route(iface, a_new, true);
571 }
572
573 if (!keep) {
574 if (a_new->policy_table)
575 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
576 (v6) ? 128 : 32, a_new->policy_table, NULL, NULL);
577 }
578 }
579 }
580 }
581
582 static bool
583 enable_route(struct interface_ip_settings *ip, struct device_route *route)
584 {
585 if (ip->no_defaultroute && !route->mask)
586 return false;
587
588 return ip->enabled;
589 }
590
591 static void
592 interface_update_proto_route(struct vlist_tree *tree,
593 struct vlist_node *node_new,
594 struct vlist_node *node_old)
595 {
596 struct interface_ip_settings *ip;
597 struct interface *iface;
598 struct device *dev;
599 struct device_route *route_old, *route_new;
600 bool keep = false;
601
602 ip = container_of(tree, struct interface_ip_settings, route);
603 iface = ip->iface;
604 dev = iface->l3_dev.dev;
605
606 if (!node_new || !node_old)
607 iface->updated |= IUF_ROUTE;
608
609 route_old = container_of(node_old, struct device_route, node);
610 route_new = container_of(node_new, struct device_route, node);
611
612 if (node_old && node_new)
613 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
614 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
615 !route_old->failed;
616
617 if (node_old) {
618 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
619 system_del_route(dev, route_old);
620
621 free(route_old);
622 }
623
624 if (node_new) {
625 bool _enabled = enable_route(ip, route_new);
626
627 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
628 if (system_add_route(dev, route_new))
629 route_new->failed = true;
630
631 route_new->iface = iface;
632 route_new->enabled = _enabled;
633 }
634 }
635
636 static void
637 interface_update_host_route(struct vlist_tree *tree,
638 struct vlist_node *node_new,
639 struct vlist_node *node_old)
640 {
641 struct interface *iface;
642 struct device *dev;
643 struct device_route *route_old, *route_new;
644
645 iface = container_of(tree, struct interface, host_routes);
646 dev = iface->l3_dev.dev;
647
648 route_old = container_of(node_old, struct device_route, node);
649 route_new = container_of(node_new, struct device_route, node);
650
651 if (node_old) {
652 system_del_route(dev, route_old);
653 free(route_old);
654 }
655
656 if (node_new) {
657 if (system_add_route(dev, route_new))
658 route_new->failed = true;
659 }
660 }
661
662 static void
663 random_ifaceid(struct in6_addr *addr)
664 {
665 static bool initialized = false;
666 struct timeval t;
667
668 if (!initialized) {
669 long int seed = 0;
670 gettimeofday(&t, NULL);
671 seed = t.tv_sec ^ t.tv_usec ^ getpid();
672 srand48(seed);
673 initialized = true;
674 }
675 addr->s6_addr32[2] = (uint32_t)mrand48();
676 addr->s6_addr32[3] = (uint32_t)mrand48();
677 }
678
679 static void
680 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
681 {
682 /* get mac address */
683 uint8_t *macaddr = iface->l3_dev.dev->settings.macaddr;
684 uint8_t *ifaceid = addr->s6_addr + 8;
685 memcpy(ifaceid,macaddr,3);
686 memcpy(ifaceid + 5,macaddr + 3, 3);
687 ifaceid[3] = 0xff;
688 ifaceid[4] = 0xfe;
689 ifaceid[0] ^= 0x02;
690 }
691
692 static void
693 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
694 {
695 /* generate new iface id */
696 switch (iface->assignment_iface_id_selection) {
697 case IFID_FIXED:
698 /* fixed */
699 /* copy host part from assignment_fixed_iface_id */
700 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
701 break;
702 case IFID_RANDOM:
703 /* randomize last 64 bits */
704 random_ifaceid(addr);
705 break;
706 case IFID_EUI64:
707 /* eui64 */
708 eui64_ifaceid(iface, addr);
709 break;
710 }
711 }
712
713 static void
714 interface_set_prefix_address(struct device_prefix_assignment *assignment,
715 const struct device_prefix *prefix, struct interface *iface, bool add)
716 {
717 const struct interface *uplink = prefix->iface;
718 if (!iface->l3_dev.dev)
719 return;
720
721 struct device *l3_downlink = iface->l3_dev.dev;
722
723 struct device_addr addr;
724 struct device_route route;
725 memset(&addr, 0, sizeof(addr));
726 memset(&route, 0, sizeof(route));
727
728 if (IN6_IS_ADDR_UNSPECIFIED(&assignment->addr)) {
729 addr.addr.in6 = prefix->addr;
730 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
731 generate_ifaceid(iface, &addr.addr.in6);
732 assignment->addr = addr.addr.in6;
733 }
734 else
735 addr.addr.in6 = assignment->addr;
736
737 addr.mask = assignment->length;
738 addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
739 addr.preferred_until = prefix->preferred_until;
740 addr.valid_until = prefix->valid_until;
741
742 route.flags = DEVADDR_INET6;
743 route.mask = addr.mask < 64 ? 64 : addr.mask;
744 route.addr = addr.addr;
745 clear_if_addr(&route.addr, route.mask);
746
747 if (!add && assignment->enabled) {
748 time_t now = system_get_rtime();
749 addr.preferred_until = now;
750 if (!addr.valid_until || addr.valid_until - now > 7200)
751 addr.valid_until = now + 7200;
752
753 if (prefix->iface) {
754 if (prefix->iface->ip6table)
755 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
756 addr.mask, prefix->iface->ip6table, iface, NULL);
757
758 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
759 addr.mask, 0, iface, "unreachable");
760 }
761
762 system_del_route(l3_downlink, &route);
763 system_add_address(l3_downlink, &addr);
764
765 assignment->enabled = false;
766 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
767 !system_add_address(l3_downlink, &addr)) {
768
769 if (prefix->iface && !assignment->enabled) {
770 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
771 addr.mask, 0, iface, "unreachable");
772
773 if (prefix->iface->ip6table)
774 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
775 addr.mask, prefix->iface->ip6table, iface, NULL);
776 }
777
778 route.metric = iface->metric;
779 system_add_route(l3_downlink, &route);
780
781 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
782 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
783 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
784
785 if (mtu > 0 && mtu_old > mtu)
786 system_update_ipv6_mtu(l3_downlink, mtu);
787 }
788
789 assignment->enabled = true;
790 }
791 }
792
793 static bool interface_prefix_assign(struct list_head *list,
794 struct device_prefix_assignment *assign)
795 {
796 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
797 struct device_prefix_assignment *c;
798 list_for_each_entry(c, list, head) {
799 if (assign->assigned != -1) {
800 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
801 list_add_tail(&assign->head, &c->head);
802 return true;
803 }
804 } else if (assign->assigned == -1) {
805 current = (current + asize) & (~asize);
806 if (current + asize < c->assigned) {
807 assign->assigned = current;
808 list_add_tail(&assign->head, &c->head);
809 return true;
810 }
811 }
812 current = (c->assigned + (1 << (64 - c->length)));
813 }
814 return false;
815 }
816
817 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
818 {
819 struct device_prefix_assignment *c;
820 struct interface *iface;
821
822 // Delete all assignments
823 while (!list_empty(&prefix->assignments)) {
824 c = list_first_entry(&prefix->assignments,
825 struct device_prefix_assignment, head);
826 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
827 interface_set_prefix_address(c, prefix, iface, false);
828 list_del(&c->head);
829 free(c);
830 }
831
832 if (!setup)
833 return;
834
835 // End-of-assignment sentinel
836 c = malloc(sizeof(*c) + 1);
837 c->assigned = 1 << (64 - prefix->length);
838 c->length = 64;
839 c->name[0] = 0;
840 c->addr = in6addr_any;
841 list_add(&c->head, &prefix->assignments);
842
843 // Excluded prefix
844 if (prefix->excl_length > 0) {
845 const char name[] = "!excluded";
846 c = malloc(sizeof(*c) + sizeof(name));
847 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
848 ((1 << (64 - prefix->length)) - 1);
849 c->length = prefix->excl_length;
850 c->addr = in6addr_any;
851 memcpy(c->name, name, sizeof(name));
852 list_add(&c->head, &prefix->assignments);
853 }
854
855 bool assigned_any = false;
856 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
857 vlist_for_each_element(&interfaces, iface, node) {
858 if (iface->assignment_length < 48 ||
859 iface->assignment_length > 64)
860 continue;
861
862 // Test whether there is a matching class
863 if (!list_empty(&iface->assignment_classes)) {
864 bool found = false;
865
866 struct interface_assignment_class *c;
867 list_for_each_entry(c, &iface->assignment_classes, head) {
868 if (!strcmp(c->name, prefix->pclass)) {
869 found = true;
870 break;
871 }
872 }
873
874 if (!found)
875 continue;
876 }
877
878 size_t namelen = strlen(iface->name) + 1;
879 c = malloc(sizeof(*c) + namelen);
880 c->length = iface->assignment_length;
881 c->assigned = iface->assignment_hint;
882 c->addr = in6addr_any;
883 c->enabled = false;
884 memcpy(c->name, iface->name, namelen);
885
886 // First process all custom assignments, put all others in later-list
887 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
888 if (c->assigned != -1) {
889 c->assigned = -1;
890 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
891 "of size %hhu for %s, trying other\n", c->length, c->name);
892 }
893
894 struct list_head *next = &assign_later;
895 struct device_prefix_assignment *n;
896 list_for_each_entry(n, &assign_later, head) {
897 if (n->length < c->length) {
898 next = &n->head;
899 break;
900 }
901 }
902 list_add_tail(&c->head, next);
903 }
904
905 if (c->assigned != -1)
906 assigned_any = true;
907 }
908
909 // Then try to assign all other + failed custom assignments
910 while (!list_empty(&assign_later)) {
911 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
912 list_del(&c->head);
913
914 bool assigned = false;
915 do {
916 assigned = interface_prefix_assign(&prefix->assignments, c);
917 } while (!assigned && ++c->length <= 64);
918
919 if (!assigned) {
920 netifd_log_message(L_WARNING, "Failed to assign subprefix "
921 "of size %hhu for %s\n", c->length, c->name);
922 free(c);
923 } else {
924 assigned_any = true;
925 }
926 }
927
928 list_for_each_entry(c, &prefix->assignments, head)
929 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
930 interface_set_prefix_address(c, prefix, iface, true);
931
932 if (!assigned_any)
933 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
934 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
935 }
936
937
938 void interface_refresh_assignments(bool hint)
939 {
940 static bool refresh = false;
941 if (!hint && refresh) {
942 struct device_prefix *p;
943 list_for_each_entry(p, &prefixes, head)
944 interface_update_prefix_assignments(p, true);
945 }
946 refresh = hint;
947 }
948
949
950 static void
951 interface_update_prefix(struct vlist_tree *tree,
952 struct vlist_node *node_new,
953 struct vlist_node *node_old)
954 {
955 struct device_prefix *prefix_old, *prefix_new;
956 prefix_old = container_of(node_old, struct device_prefix, node);
957 prefix_new = container_of(node_new, struct device_prefix, node);
958
959 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
960 if (tree && (!node_new || !node_old))
961 ip->iface->updated |= IUF_PREFIX;
962
963 struct device_route route;
964 memset(&route, 0, sizeof(route));
965 route.flags = DEVADDR_INET6;
966 route.metric = INT32_MAX;
967 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
968 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
969
970
971 struct device_prefix_assignment *c;
972 struct interface *iface;
973
974 if (node_old && node_new) {
975 // Move assignments and refresh addresses to update valid times
976 list_splice(&prefix_old->assignments, &prefix_new->assignments);
977
978 list_for_each_entry(c, &prefix_new->assignments, head)
979 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
980 interface_set_prefix_address(c, prefix_new, iface, true);
981 } else if (node_new) {
982 // Set null-route to avoid routing loops
983 system_add_route(NULL, &route);
984
985 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
986 interface_update_prefix_assignments(prefix_new, true);
987 } else if (node_old) {
988 // Remove null-route
989 interface_update_prefix_assignments(prefix_old, false);
990 system_del_route(NULL, &route);
991 }
992
993 if (node_old) {
994 if (prefix_old->head.next)
995 list_del(&prefix_old->head);
996 free(prefix_old);
997 }
998
999 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1000 list_add(&prefix_new->head, &prefixes);
1001
1002 }
1003
1004 struct device_prefix*
1005 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1006 uint8_t length, time_t valid_until, time_t preferred_until,
1007 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1008 {
1009 if (!pclass)
1010 pclass = (iface) ? iface->name : "local";
1011
1012 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1013 prefix->length = length;
1014 prefix->addr = *addr;
1015 prefix->preferred_until = preferred_until;
1016 prefix->valid_until = valid_until;
1017 prefix->iface = iface;
1018 INIT_LIST_HEAD(&prefix->assignments);
1019
1020 if (excl_addr) {
1021 prefix->excl_addr = *excl_addr;
1022 prefix->excl_length = excl_length;
1023 }
1024
1025 strcpy(prefix->pclass, pclass);
1026
1027 if (iface)
1028 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1029 else
1030 interface_update_prefix(NULL, &prefix->node, NULL);
1031
1032 return prefix;
1033 }
1034
1035 void
1036 interface_ip_set_ula_prefix(const char *prefix)
1037 {
1038 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1039 if (prefix)
1040 strncpy(buf, prefix, sizeof(buf) - 1);
1041 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1042
1043 struct in6_addr addr;
1044 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1045 if (ula_prefix) {
1046 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1047 ula_prefix = NULL;
1048 }
1049 return;
1050 }
1051
1052 int length;
1053 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1054 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1055 return;
1056
1057 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1058 ula_prefix->length != length) {
1059 if (ula_prefix)
1060 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1061
1062 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1063 0, 0, NULL, 0, NULL);
1064 }
1065 }
1066
1067 void
1068 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1069 {
1070 struct dns_server *s;
1071
1072 s = calloc(1, sizeof(*s));
1073 if (!s)
1074 return;
1075
1076 s->af = AF_INET;
1077 if (inet_pton(s->af, str, &s->addr.in))
1078 goto add;
1079
1080 s->af = AF_INET6;
1081 if (inet_pton(s->af, str, &s->addr.in))
1082 goto add;
1083
1084 free(s);
1085 return;
1086
1087 add:
1088 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1089 s->af == AF_INET6 ? '6' : '4', str);
1090 vlist_simple_add(&ip->dns_servers, &s->node);
1091 }
1092
1093 void
1094 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1095 {
1096 struct blob_attr *cur;
1097 int rem;
1098
1099 blobmsg_for_each_attr(cur, list, rem) {
1100 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1101 continue;
1102
1103 if (!blobmsg_check_attr(cur, NULL))
1104 continue;
1105
1106 interface_add_dns_server(ip, blobmsg_data(cur));
1107 }
1108 }
1109
1110 static void
1111 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1112 {
1113 struct dns_search_domain *s;
1114 int len = strlen(str);
1115
1116 s = calloc(1, sizeof(*s) + len + 1);
1117 if (!s)
1118 return;
1119
1120 D(INTERFACE, "Add DNS search domain: %s\n", str);
1121 memcpy(s->name, str, len);
1122 vlist_simple_add(&ip->dns_search, &s->node);
1123 }
1124
1125 void
1126 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1127 {
1128 struct blob_attr *cur;
1129 int rem;
1130
1131 blobmsg_for_each_attr(cur, list, rem) {
1132 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1133 continue;
1134
1135 if (!blobmsg_check_attr(cur, NULL))
1136 continue;
1137
1138 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1139 }
1140 }
1141
1142 static void
1143 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1144 {
1145 struct dns_server *s;
1146 struct dns_search_domain *d;
1147 const char *str;
1148 char buf[INET6_ADDRSTRLEN];
1149
1150 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1151 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1152 if (!str)
1153 continue;
1154
1155 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1156 fprintf(f, "nameserver %s%%%s\n", str, dev);
1157 else
1158 fprintf(f, "nameserver %s\n", str);
1159 }
1160
1161 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1162 fprintf(f, "search %s\n", d->name);
1163 }
1164 }
1165
1166 void
1167 interface_write_resolv_conf(void)
1168 {
1169 struct interface *iface;
1170 char *path = alloca(strlen(resolv_conf) + 5);
1171 FILE *f;
1172 uint32_t crcold, crcnew;
1173
1174 sprintf(path, "%s.tmp", resolv_conf);
1175 unlink(path);
1176 f = fopen(path, "w+");
1177 if (!f) {
1178 D(INTERFACE, "Failed to open %s for writing\n", path);
1179 return;
1180 }
1181
1182 vlist_for_each_element(&interfaces, iface, node) {
1183 if (iface->state != IFS_UP)
1184 continue;
1185
1186 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1187 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1188 vlist_simple_empty(&iface->config_ip.dns_search) &&
1189 vlist_simple_empty(&iface->config_ip.dns_servers))
1190 continue;
1191
1192 fprintf(f, "# Interface %s\n", iface->name);
1193 write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
1194 if (!iface->proto_ip.no_dns)
1195 write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
1196 }
1197 fflush(f);
1198 rewind(f);
1199 crcnew = crc32_file(f);
1200 fclose(f);
1201
1202 crcold = crcnew + 1;
1203 f = fopen(resolv_conf, "r");
1204 if (f) {
1205 crcold = crc32_file(f);
1206 fclose(f);
1207 }
1208
1209 if (crcold == crcnew) {
1210 unlink(path);
1211 } else if (rename(path, resolv_conf) < 0) {
1212 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1213 unlink(path);
1214 }
1215 }
1216
1217 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1218 {
1219 struct device_addr *addr;
1220 struct device_route *route;
1221 struct device *dev;
1222 struct interface *iface;
1223
1224 ip->enabled = enabled;
1225 iface = ip->iface;
1226 dev = iface->l3_dev.dev;
1227 if (!dev)
1228 return;
1229
1230 vlist_for_each_element(&ip->addr, addr, node) {
1231 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1232
1233 if (addr->enabled == enabled)
1234 continue;
1235
1236 if (enabled) {
1237 system_add_address(dev, addr);
1238
1239 addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1240 if (iface->metric || addr->policy_table)
1241 interface_handle_subnet_route(iface, addr, true);
1242
1243 if (addr->policy_table)
1244 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
1245 (v6) ? 128 : 32, addr->policy_table, NULL, NULL);
1246 } else {
1247 interface_handle_subnet_route(iface, addr, false);
1248 system_del_address(dev, addr);
1249
1250 if (addr->policy_table)
1251 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
1252 (v6) ? 128 : 32, addr->policy_table, NULL, NULL);
1253 }
1254 addr->enabled = enabled;
1255 }
1256
1257 vlist_for_each_element(&ip->route, route, node) {
1258 bool _enabled = enabled;
1259
1260 if (!enable_route(ip, route))
1261 _enabled = false;
1262
1263 if (route->enabled == _enabled)
1264 continue;
1265
1266 if (_enabled) {
1267 if (!(route->flags & DEVROUTE_METRIC))
1268 route->metric = ip->iface->metric;
1269
1270 if (!(route->flags & DEVROUTE_TABLE)) {
1271 route->flags &= ~DEVROUTE_SRCTABLE;
1272 route->table = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ?
1273 iface->ip6table : iface->ip4table;
1274
1275 if (route->table)
1276 route->flags |= DEVROUTE_SRCTABLE;
1277 }
1278
1279 if (system_add_route(dev, route))
1280 route->failed = true;
1281 } else
1282 system_del_route(dev, route);
1283 route->enabled = _enabled;
1284 }
1285
1286 struct device_prefix *c;
1287 struct device_prefix_assignment *a;
1288 list_for_each_entry(c, &prefixes, head)
1289 list_for_each_entry(a, &c->assignments, head)
1290 if (!strcmp(a->name, ip->iface->name))
1291 interface_set_prefix_address(a, c, ip->iface, enabled);
1292
1293 if (ip->iface && ip->iface->l3_dev.dev) {
1294 set_ip_lo_policy(enabled, true, ip->iface);
1295 set_ip_lo_policy(enabled, false, ip->iface);
1296
1297 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1298 NULL, 0, 0, ip->iface, "failed_policy");
1299 }
1300 }
1301
1302 void
1303 interface_ip_update_start(struct interface_ip_settings *ip)
1304 {
1305 if (ip != &ip->iface->config_ip) {
1306 vlist_simple_update(&ip->dns_servers);
1307 vlist_simple_update(&ip->dns_search);
1308 }
1309 vlist_update(&ip->route);
1310 vlist_update(&ip->addr);
1311 vlist_update(&ip->prefix);
1312 }
1313
1314 void
1315 interface_ip_update_complete(struct interface_ip_settings *ip)
1316 {
1317 vlist_simple_flush(&ip->dns_servers);
1318 vlist_simple_flush(&ip->dns_search);
1319 vlist_flush(&ip->route);
1320 vlist_flush(&ip->addr);
1321 vlist_flush(&ip->prefix);
1322 interface_write_resolv_conf();
1323 }
1324
1325 void
1326 interface_ip_flush(struct interface_ip_settings *ip)
1327 {
1328 if (ip == &ip->iface->proto_ip)
1329 vlist_flush_all(&ip->iface->host_routes);
1330 vlist_simple_flush_all(&ip->dns_servers);
1331 vlist_simple_flush_all(&ip->dns_search);
1332 vlist_flush_all(&ip->route);
1333 vlist_flush_all(&ip->addr);
1334 vlist_flush_all(&ip->prefix);
1335 }
1336
1337 static void
1338 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1339 {
1340 ip->iface = iface;
1341 ip->enabled = true;
1342 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1343 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1344 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1345 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1346 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1347 }
1348
1349 void
1350 interface_ip_init(struct interface *iface)
1351 {
1352 __interface_ip_init(&iface->proto_ip, iface);
1353 __interface_ip_init(&iface->config_ip, iface);
1354 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1355 }
1356
1357 static void
1358 interface_ip_valid_until_handler(struct uloop_timeout *t)
1359 {
1360 time_t now = system_get_rtime();
1361 struct interface *iface;
1362 vlist_for_each_element(&interfaces, iface, node) {
1363 if (iface->state != IFS_UP)
1364 continue;
1365
1366 struct device_addr *addr, *addrp;
1367 struct device_route *route, *routep;
1368 struct device_prefix *pref, *prefp;
1369
1370 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1371 if (addr->valid_until && addr->valid_until < now)
1372 vlist_delete(&iface->proto_ip.addr, &addr->node);
1373
1374 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1375 if (route->valid_until && route->valid_until < now)
1376 vlist_delete(&iface->proto_ip.route, &route->node);
1377
1378 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1379 if (pref->valid_until && pref->valid_until < now)
1380 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1381
1382 }
1383
1384 uloop_timeout_set(t, 1000);
1385 }
1386
1387 static void __init
1388 interface_ip_init_worker(void)
1389 {
1390 valid_until_timeout.cb = interface_ip_valid_until_handler;
1391 uloop_timeout_set(&valid_until_timeout, 1000);
1392 }
OpenWrt Network interface configuration daemon