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[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 #include <unistd.h>
19
20 #include <arpa/inet.h>
21
22 #include "netifd.h"
23 #include "device.h"
24 #include "interface.h"
25 #include "interface-ip.h"
26 #include "proto.h"
27 #include "ubus.h"
28 #include "system.h"
29
30 enum {
31 ROUTE_INTERFACE,
32 ROUTE_TARGET,
33 ROUTE_MASK,
34 ROUTE_GATEWAY,
35 ROUTE_METRIC,
36 ROUTE_MTU,
37 ROUTE_VALID,
38 ROUTE_TABLE,
39 __ROUTE_MAX
40 };
41
42 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
43 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
44 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
45 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
46 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
47 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
48 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
49 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
50 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
51 };
52
53 const struct config_param_list route_attr_list = {
54 .n_params = __ROUTE_MAX,
55 .params = route_attr,
56 };
57
58
59 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
60 static struct device_prefix *ula_prefix = NULL;
61 static struct uloop_timeout valid_until_timeout;
62
63
64 static void
65 clear_if_addr(union if_addr *a, int mask)
66 {
67 int m_bytes = (mask + 7) / 8;
68 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
69 uint8_t *p = (uint8_t *) a;
70
71 if (m_bytes < sizeof(a))
72 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
73
74 p[m_bytes - 1] &= ~m_clear;
75 }
76
77 static bool
78 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
79 {
80 union if_addr *p1, *p2;
81
82 p1 = alloca(sizeof(*a1));
83 p2 = alloca(sizeof(*a2));
84
85 memcpy(p1, a1, sizeof(*a1));
86 clear_if_addr(p1, mask);
87 memcpy(p2, a2, sizeof(*a2));
88 clear_if_addr(p2, mask);
89
90 return !memcmp(p1, p2, sizeof(*p1));
91 }
92
93 static bool
94 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
95 {
96 struct device_addr *addr;
97
98 vlist_for_each_element(&ip->addr, addr, node) {
99 if (!addr->enabled)
100 continue;
101
102 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
103 continue;
104
105 if (!match_if_addr(&addr->addr, a, addr->mask))
106 continue;
107
108 return true;
109 }
110
111 return false;
112 }
113
114 static void
115 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
116 bool v6, struct device_route **res)
117 {
118 struct device_route *route;
119
120 vlist_for_each_element(&ip->route, route, node) {
121 if (!route->enabled)
122 continue;
123
124 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
125 continue;
126
127 if (!match_if_addr(&route->addr, a, route->mask))
128 continue;
129
130 if (route->flags & DEVROUTE_TABLE)
131 continue;
132
133 if (!*res || route->mask < (*res)->mask)
134 *res = route;
135 }
136 }
137
138 static bool
139 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
140 {
141 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
142 __find_ip_addr_target(&iface->config_ip, a, v6);
143 }
144
145 static void
146 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
147 bool v6, struct device_route **route)
148 {
149 __find_ip_route_target(&iface->proto_ip, a, v6, route);
150 __find_ip_route_target(&iface->config_ip, a, v6, route);
151 }
152
153 struct interface *
154 interface_ip_add_target_route(union if_addr *addr, bool v6)
155 {
156 struct interface *iface;
157 struct device_route *route, *r_next = NULL;
158 bool defaultroute_target = false;
159 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
160
161 route = calloc(1, sizeof(*route));
162 if (!route)
163 return NULL;
164
165 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
166 route->mask = v6 ? 128 : 32;
167 if (memcmp(&route->addr, addr, addrsize) == 0)
168 defaultroute_target = true;
169 else
170 memcpy(&route->addr, addr, addrsize);
171
172 vlist_for_each_element(&interfaces, iface, node) {
173 /* look for locally addressable target first */
174 if (interface_ip_find_addr_target(iface, addr, v6))
175 goto done;
176
177 /* do not stop at the first route, let the lookup compare
178 * masks to find the best match */
179 interface_ip_find_route_target(iface, addr, v6, &r_next);
180 }
181
182 if (!r_next) {
183 free(route);
184 return NULL;
185 }
186
187 iface = r_next->iface;
188 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
189 route->mtu = r_next->mtu;
190 route->metric = r_next->metric;
191
192 done:
193 route->iface = iface;
194 if (defaultroute_target)
195 free(route);
196 else
197 vlist_add(&iface->host_routes, &route->node, route);
198 return iface;
199 }
200
201 void
202 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
203 {
204 struct interface_ip_settings *ip;
205 struct blob_attr *tb[__ROUTE_MAX], *cur;
206 struct device_route *route;
207 int af = v6 ? AF_INET6 : AF_INET;
208
209 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
210
211 if (!iface) {
212 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
213 return;
214
215 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
216 if (!iface)
217 return;
218
219 ip = &iface->config_ip;
220 } else {
221 ip = &iface->proto_ip;
222 }
223
224 route = calloc(1, sizeof(*route));
225 if (!route)
226 return;
227
228 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
229 route->mask = v6 ? 128 : 32;
230 if ((cur = tb[ROUTE_MASK]) != NULL) {
231 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
232 if (route->mask > (v6 ? 128 : 32))
233 goto error;
234 }
235
236 if ((cur = tb[ROUTE_TARGET]) != NULL) {
237 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
238 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
239 goto error;
240 }
241 }
242
243 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
244 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
245 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
246 goto error;
247 }
248 }
249
250 if ((cur = tb[ROUTE_METRIC]) != NULL) {
251 route->metric = blobmsg_get_u32(cur);
252 route->flags |= DEVROUTE_METRIC;
253 }
254
255 if ((cur = tb[ROUTE_MTU]) != NULL) {
256 route->mtu = blobmsg_get_u32(cur);
257 route->flags |= DEVROUTE_MTU;
258 }
259
260 if ((cur = tb[ROUTE_TABLE]) != NULL) {
261 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
262 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
263 goto error;
264 }
265
266 if (route->table)
267 route->flags |= DEVROUTE_TABLE;
268 }
269
270 if ((cur = tb[ROUTE_VALID]) != NULL)
271 route->valid_until = system_get_rtime() + blobmsg_get_u32(cur);
272
273 vlist_add(&ip->route, &route->node, route);
274 return;
275
276 error:
277 free(route);
278 }
279
280 static int
281 addr_cmp(const void *k1, const void *k2, void *ptr)
282 {
283 return memcmp(k1, k2, sizeof(struct device_addr) -
284 offsetof(struct device_addr, flags));
285 }
286
287 static int
288 route_cmp(const void *k1, const void *k2, void *ptr)
289 {
290 const struct device_route *r1 = k1, *r2 = k2;
291
292 if (r1->mask != r2->mask)
293 return r2->mask - r1->mask;
294
295 if (r1->metric != r2->metric)
296 return r1->metric - r2->metric;
297
298 if (r1->flags != r2->flags)
299 return r2->flags - r1->flags;
300
301 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
302 }
303
304 static int
305 prefix_cmp(const void *k1, const void *k2, void *ptr)
306 {
307 return memcmp(k1, k2, sizeof(struct device_prefix) -
308 offsetof(struct device_prefix, addr));
309 }
310
311 static void
312 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
313 {
314 struct device *dev = iface->l3_dev.dev;
315 struct device_route route;
316
317 memset(&route, 0, sizeof(route));
318 route.iface = iface;
319 route.flags = addr->flags;
320 route.mask = addr->mask;
321 memcpy(&route.addr, &addr->addr, sizeof(route.addr));
322 clear_if_addr(&route.addr, route.mask);
323
324 if (add) {
325 route.flags |= DEVADDR_KERNEL;
326 system_del_route(dev, &route);
327
328 if (!(addr->flags & DEVADDR_OFFLINK)) {
329 route.flags &= ~DEVADDR_KERNEL;
330 route.metric = iface->metric;
331 system_add_route(dev, &route);
332 }
333 } else {
334 if (!(addr->flags & DEVADDR_OFFLINK))
335 system_del_route(dev, &route);
336 }
337 }
338
339 static void
340 interface_update_proto_addr(struct vlist_tree *tree,
341 struct vlist_node *node_new,
342 struct vlist_node *node_old)
343 {
344 struct interface_ip_settings *ip;
345 struct interface *iface;
346 struct device *dev;
347 struct device_addr *a_new = NULL, *a_old = NULL;
348 bool keep = false;
349
350 ip = container_of(tree, struct interface_ip_settings, addr);
351 iface = ip->iface;
352 dev = iface->l3_dev.dev;
353
354 if (node_new) {
355 a_new = container_of(node_new, struct device_addr, node);
356
357 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
358 !a_new->broadcast) {
359
360 uint32_t mask = ~0;
361 uint32_t *a = (uint32_t *) &a_new->addr;
362
363 mask >>= a_new->mask;
364 a_new->broadcast = *a | htonl(mask);
365 }
366 }
367
368 if (node_old)
369 a_old = container_of(node_old, struct device_addr, node);
370
371 if (a_new && a_old) {
372 keep = true;
373
374 if (a_old->flags != a_new->flags ||
375 a_old->valid_until != a_new->valid_until ||
376 a_old->preferred_until != a_new->preferred_until)
377 keep = false;
378
379 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
380 a_new->broadcast != a_old->broadcast)
381 keep = false;
382 }
383
384 if (node_old) {
385 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
386 interface_handle_subnet_route(iface, a_old, false);
387 system_del_address(dev, a_old);
388 }
389 free(a_old);
390 }
391
392 if (node_new) {
393 a_new->enabled = true;
394 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
395 system_add_address(dev, a_new);
396 if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
397 interface_handle_subnet_route(iface, a_new, true);
398 }
399 }
400 }
401
402 static bool
403 enable_route(struct interface_ip_settings *ip, struct device_route *route)
404 {
405 if (ip->no_defaultroute && !route->mask)
406 return false;
407
408 return ip->enabled;
409 }
410
411 static void
412 interface_update_proto_route(struct vlist_tree *tree,
413 struct vlist_node *node_new,
414 struct vlist_node *node_old)
415 {
416 struct interface_ip_settings *ip;
417 struct interface *iface;
418 struct device *dev;
419 struct device_route *route_old, *route_new;
420 bool keep = false;
421
422 ip = container_of(tree, struct interface_ip_settings, route);
423 iface = ip->iface;
424 dev = iface->l3_dev.dev;
425
426 route_old = container_of(node_old, struct device_route, node);
427 route_new = container_of(node_new, struct device_route, node);
428
429 if (node_old && node_new)
430 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
431
432 if (node_old) {
433 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
434 system_del_route(dev, route_old);
435 free(route_old);
436 }
437
438 if (node_new) {
439 bool _enabled = enable_route(ip, route_new);
440
441 if (!(route_new->flags & DEVROUTE_METRIC))
442 route_new->metric = iface->metric;
443
444 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
445 system_add_route(dev, route_new);
446
447 route_new->iface = iface;
448 route_new->enabled = _enabled;
449 }
450 }
451
452 static void
453 interface_update_host_route(struct vlist_tree *tree,
454 struct vlist_node *node_new,
455 struct vlist_node *node_old)
456 {
457 struct interface *iface;
458 struct device *dev;
459 struct device_route *route_old, *route_new;
460
461 iface = container_of(tree, struct interface, host_routes);
462 dev = iface->l3_dev.dev;
463
464 route_old = container_of(node_old, struct device_route, node);
465 route_new = container_of(node_new, struct device_route, node);
466
467 if (node_old) {
468 system_del_route(dev, route_old);
469 free(route_old);
470 }
471
472 if (node_new)
473 system_add_route(dev, route_new);
474 }
475
476
477 static void
478 interface_set_prefix_address(struct device_prefix_assignment *assignment,
479 const struct device_prefix *prefix, struct interface *iface, bool add);
480
481 static void interface_trigger_ula_prefix(struct interface *iface,
482 const struct device_prefix *prefix, bool enable)
483 {
484 if (prefix == ula_prefix || (prefix->addr.s6_addr[0] & 0xfe) != 0xfc)
485 return;
486
487 bool external_ula = false;
488 struct device_prefix_assignment *ula_assign = NULL;
489 struct device_prefix *c;
490 list_for_each_entry(c, &prefixes, head) {
491 if (c != ula_prefix && (c->addr.s6_addr[0] & 0xfe) != 0xfc)
492 continue;
493
494 struct device_prefix_assignment *a;
495 list_for_each_entry(a, &c->assignments, head) {
496 if (!strcmp(a->name, iface->name)) {
497 if (c == ula_prefix)
498 ula_assign = a;
499 else if (a->enabled)
500 external_ula = true;
501 }
502 }
503
504 }
505
506 // Remove ULA assignment if there is an externally managed ULA and vice versa
507 if (ula_assign && ((enable && !external_ula) || (!enable && external_ula)))
508 interface_set_prefix_address(ula_assign, ula_prefix, iface, enable);
509 }
510
511
512 static void
513 interface_set_prefix_address(struct device_prefix_assignment *assignment,
514 const struct device_prefix *prefix, struct interface *iface, bool add)
515 {
516 const struct interface *uplink = prefix->iface;
517 if (!iface->l3_dev.dev)
518 return;
519
520 struct device *l3_downlink = iface->l3_dev.dev;
521
522 struct device_addr addr;
523 memset(&addr, 0, sizeof(addr));
524 addr.addr.in6 = prefix->addr;
525 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
526 addr.addr.in6.s6_addr[15] += 1;
527 addr.mask = assignment->length;
528 addr.flags = DEVADDR_INET6;
529 addr.preferred_until = prefix->preferred_until;
530 addr.valid_until = prefix->valid_until;
531
532 if (!add && assignment->enabled) {
533 time_t now = system_get_rtime();
534 addr.preferred_until = now;
535 if (!addr.valid_until || addr.valid_until - now > 7200)
536 addr.valid_until = now + 7200;
537 system_add_address(l3_downlink, &addr);
538 assignment->enabled = false;
539
540 interface_trigger_ula_prefix(iface, prefix, true);
541 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
542 system_add_address(l3_downlink, &addr);
543 if (uplink && uplink->l3_dev.dev) {
544 int mtu = system_update_ipv6_mtu(
545 uplink->l3_dev.dev, 0);
546 if (mtu > 0)
547 system_update_ipv6_mtu(l3_downlink, mtu);
548 }
549 assignment->enabled = true;
550
551 interface_trigger_ula_prefix(iface, prefix, false);
552 }
553 }
554
555 static bool interface_prefix_assign(struct list_head *list,
556 struct device_prefix_assignment *assign)
557 {
558 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
559 struct device_prefix_assignment *c;
560 list_for_each_entry(c, list, head) {
561 if (assign->assigned != -1) {
562 if (assign->assigned > current && assign->assigned + asize < c->assigned) {
563 list_add_tail(&assign->head, &c->head);
564 return true;
565 }
566 } else if (assign->assigned == -1) {
567 current = (current + asize) & (~asize);
568 if (current + asize < c->assigned) {
569 assign->assigned = current;
570 list_add_tail(&assign->head, &c->head);
571 return true;
572 }
573 }
574 current = (c->assigned + (1 << (64 - c->length)));
575 }
576 return false;
577 }
578
579 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
580 {
581 struct device_prefix_assignment *c;
582 struct interface *iface;
583
584 // Delete all assignments
585 while (!list_empty(&prefix->assignments)) {
586 c = list_first_entry(&prefix->assignments,
587 struct device_prefix_assignment, head);
588 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
589 interface_set_prefix_address(c, prefix, iface, false);
590 list_del(&c->head);
591 free(c);
592 }
593
594 if (!setup)
595 return;
596
597 // End-of-assignment sentinel
598 c = malloc(sizeof(*c) + 1);
599 c->assigned = 1 << (64 - prefix->length);
600 c->length = 64;
601 c->name[0] = 0;
602 list_add(&c->head, &prefix->assignments);
603
604 // Excluded prefix
605 if (prefix->excl_length > 0) {
606 const char name[] = "!excluded";
607 c = malloc(sizeof(*c) + sizeof(name));
608 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
609 ((1 << (64 - prefix->length)) - 1);
610 c->length = prefix->excl_length;
611 memcpy(c->name, name, sizeof(name));
612 list_add(&c->head, &prefix->assignments);
613 }
614
615 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
616 vlist_for_each_element(&interfaces, iface, node) {
617 if (iface->config_ip.assignment_length < 48 ||
618 iface->config_ip.assignment_length > 64)
619 continue;
620
621 size_t namelen = strlen(iface->name) + 1;
622 c = malloc(sizeof(*c) + namelen);
623 c->length = iface->config_ip.assignment_length;
624 c->assigned = iface->config_ip.assignment_hint;
625 c->enabled = false;
626 memcpy(c->name, iface->name, namelen);
627
628 // First process all custom assignments, put all others in later-list
629 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
630 if (c->assigned != -1) {
631 c->assigned = -1;
632 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
633 "of size %hhu for %s, trying other\n", c->length, c->name);
634 }
635 list_add_tail(&c->head, &assign_later);
636 }
637 }
638
639 // Then try to assign all other + failed custom assignments
640 while (!list_empty(&assign_later)) {
641 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
642 list_del(&c->head);
643
644 bool assigned = false;
645 do {
646 assigned = interface_prefix_assign(&prefix->assignments, c);
647 } while (!assigned && ++c->length <= 64);
648
649 if (!assigned) {
650 netifd_log_message(L_WARNING, "Failed to assign subprefix "
651 "of size %hhu for %s\n", c->length, c->name);
652 free(c);
653 }
654 }
655
656 list_for_each_entry(c, &prefix->assignments, head)
657 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
658 interface_set_prefix_address(c, prefix, iface, true);
659 }
660
661
662 void interface_refresh_assignments(bool hint)
663 {
664 static bool refresh = false;
665 if (!hint && refresh) {
666 struct device_prefix *p;
667 list_for_each_entry(p, &prefixes, head)
668 interface_update_prefix_assignments(p, true);
669 }
670 refresh = hint;
671 }
672
673
674 static void
675 interface_update_prefix(struct vlist_tree *tree,
676 struct vlist_node *node_new,
677 struct vlist_node *node_old)
678 {
679 struct device_prefix *prefix_old, *prefix_new;
680 prefix_old = container_of(node_old, struct device_prefix, node);
681 prefix_new = container_of(node_new, struct device_prefix, node);
682
683 struct device_route route;
684 memset(&route, 0, sizeof(route));
685 route.flags = DEVADDR_INET6;
686 route.metric = INT32_MAX;
687 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
688 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
689
690 struct device_prefix_assignment *c;
691 struct interface *iface;
692
693 if (node_old && node_new) {
694 // Move assignments and refresh addresses to update valid times
695 list_splice(&prefix_old->assignments, &prefix_new->assignments);
696
697 list_for_each_entry(c, &prefix_new->assignments, head)
698 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
699 interface_set_prefix_address(c, prefix_new, iface, true);
700 } else if (node_new) {
701 // Set null-route to avoid routing loops
702 system_add_route(NULL, &route);
703
704 interface_update_prefix_assignments(prefix_new, true);
705 } else if (node_old) {
706 interface_update_prefix_assignments(prefix_old, false);
707
708 // Remove null-route
709 system_del_route(NULL, &route);
710 }
711
712 if (node_old) {
713 list_del(&prefix_old->head);
714 free(prefix_old);
715 }
716
717 if (node_new)
718 list_add(&prefix_new->head, &prefixes);
719
720 }
721
722 struct device_prefix*
723 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
724 uint8_t length, time_t valid_until, time_t preferred_until,
725 struct in6_addr *excl_addr, uint8_t excl_length)
726 {
727 struct device_prefix *prefix = calloc(1, sizeof(*prefix));
728 prefix->length = length;
729 prefix->addr = *addr;
730 prefix->preferred_until = preferred_until;
731 prefix->valid_until = valid_until;
732 prefix->iface = iface;
733 INIT_LIST_HEAD(&prefix->assignments);
734
735 if (excl_addr) {
736 prefix->excl_addr = *excl_addr;
737 prefix->excl_length = excl_length;
738 }
739
740 if (iface)
741 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
742 else
743 interface_update_prefix(NULL, &prefix->node, NULL);
744
745 return prefix;
746 }
747
748 void
749 interface_ip_set_ula_prefix(const char *prefix)
750 {
751 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
752 if (prefix)
753 strncpy(buf, prefix, sizeof(buf) - 1);
754 char *prefixaddr = strtok_r(buf, "/", &saveptr);
755
756 struct in6_addr addr;
757 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
758 if (ula_prefix) {
759 interface_update_prefix(NULL, NULL, &ula_prefix->node);
760 ula_prefix = NULL;
761 }
762 return;
763 }
764
765 int length;
766 char *prefixlen = strtok_r(NULL, ",", &saveptr);
767 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
768 return;
769
770 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
771 ula_prefix->length != length) {
772 if (ula_prefix)
773 interface_update_prefix(NULL, NULL, &ula_prefix->node);
774
775 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
776 0, 0, NULL, 0);
777 }
778 }
779
780 void
781 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
782 {
783 struct dns_server *s;
784
785 s = calloc(1, sizeof(*s));
786 if (!s)
787 return;
788
789 s->af = AF_INET;
790 if (inet_pton(s->af, str, &s->addr.in))
791 goto add;
792
793 s->af = AF_INET6;
794 if (inet_pton(s->af, str, &s->addr.in))
795 goto add;
796
797 free(s);
798 return;
799
800 add:
801 D(INTERFACE, "Add IPv%c DNS server: %s\n",
802 s->af == AF_INET6 ? '6' : '4', str);
803 vlist_simple_add(&ip->dns_servers, &s->node);
804 }
805
806 void
807 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
808 {
809 struct blob_attr *cur;
810 int rem;
811
812 blobmsg_for_each_attr(cur, list, rem) {
813 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
814 continue;
815
816 if (!blobmsg_check_attr(cur, NULL))
817 continue;
818
819 interface_add_dns_server(ip, blobmsg_data(cur));
820 }
821 }
822
823 static void
824 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
825 {
826 struct dns_search_domain *s;
827 int len = strlen(str);
828
829 s = calloc(1, sizeof(*s) + len + 1);
830 if (!s)
831 return;
832
833 D(INTERFACE, "Add DNS search domain: %s\n", str);
834 memcpy(s->name, str, len);
835 vlist_simple_add(&ip->dns_search, &s->node);
836 }
837
838 void
839 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
840 {
841 struct blob_attr *cur;
842 int rem;
843
844 blobmsg_for_each_attr(cur, list, rem) {
845 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
846 continue;
847
848 if (!blobmsg_check_attr(cur, NULL))
849 continue;
850
851 interface_add_dns_search_domain(ip, blobmsg_data(cur));
852 }
853 }
854
855 static void
856 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
857 {
858 struct dns_server *s;
859 struct dns_search_domain *d;
860 const char *str;
861 char buf[INET6_ADDRSTRLEN];
862
863 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
864 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
865 if (!str)
866 continue;
867
868 fprintf(f, "nameserver %s\n", str);
869 }
870
871 vlist_simple_for_each_element(&ip->dns_search, d, node) {
872 fprintf(f, "search %s\n", d->name);
873 }
874 }
875
876 void
877 interface_write_resolv_conf(void)
878 {
879 struct interface *iface;
880 char *path = alloca(strlen(resolv_conf) + 5);
881 FILE *f;
882 uint32_t crcold, crcnew;
883
884 sprintf(path, "%s.tmp", resolv_conf);
885 unlink(path);
886 f = fopen(path, "w+");
887 if (!f) {
888 D(INTERFACE, "Failed to open %s for writing\n", path);
889 return;
890 }
891
892 vlist_for_each_element(&interfaces, iface, node) {
893 if (iface->state != IFS_UP)
894 continue;
895
896 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
897 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
898 vlist_simple_empty(&iface->config_ip.dns_search) &&
899 vlist_simple_empty(&iface->config_ip.dns_servers))
900 continue;
901
902 fprintf(f, "# Interface %s\n", iface->name);
903 write_resolv_conf_entries(f, &iface->config_ip);
904 if (!iface->proto_ip.no_dns)
905 write_resolv_conf_entries(f, &iface->proto_ip);
906 }
907 fflush(f);
908 rewind(f);
909 crcnew = crc32_file(f);
910 fclose(f);
911
912 crcold = crcnew + 1;
913 f = fopen(resolv_conf, "r");
914 if (f) {
915 crcold = crc32_file(f);
916 fclose(f);
917 }
918
919 if (crcold == crcnew) {
920 unlink(path);
921 } else if (rename(path, resolv_conf) < 0) {
922 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
923 unlink(path);
924 }
925 }
926
927 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
928 {
929 struct device_addr *addr;
930 struct device_route *route;
931 struct device *dev;
932
933 ip->enabled = enabled;
934 dev = ip->iface->l3_dev.dev;
935 if (!dev)
936 return;
937
938 vlist_for_each_element(&ip->addr, addr, node) {
939 if (addr->enabled == enabled)
940 continue;
941
942 if (enabled)
943 system_add_address(dev, addr);
944 else
945 system_del_address(dev, addr);
946 addr->enabled = enabled;
947 }
948
949 vlist_for_each_element(&ip->route, route, node) {
950 bool _enabled = enabled;
951
952 if (!enable_route(ip, route))
953 _enabled = false;
954
955 if (route->enabled == _enabled)
956 continue;
957
958 if (_enabled) {
959 if (!(route->flags & DEVROUTE_METRIC))
960 route->metric = ip->iface->metric;
961
962 system_add_route(dev, route);
963 } else
964 system_del_route(dev, route);
965 route->enabled = _enabled;
966 }
967
968 struct device_prefix *c;
969 struct device_prefix_assignment *a;
970 list_for_each_entry(c, &prefixes, head)
971 list_for_each_entry(a, &c->assignments, head)
972 if (!strcmp(a->name, ip->iface->name))
973 interface_set_prefix_address(a, c, ip->iface, enabled);
974 }
975
976 void
977 interface_ip_update_start(struct interface_ip_settings *ip)
978 {
979 if (ip != &ip->iface->config_ip) {
980 vlist_simple_update(&ip->dns_servers);
981 vlist_simple_update(&ip->dns_search);
982 }
983 vlist_update(&ip->route);
984 vlist_update(&ip->addr);
985 vlist_update(&ip->prefix);
986 }
987
988 void
989 interface_ip_update_complete(struct interface_ip_settings *ip)
990 {
991 vlist_simple_flush(&ip->dns_servers);
992 vlist_simple_flush(&ip->dns_search);
993 vlist_flush(&ip->route);
994 vlist_flush(&ip->addr);
995 vlist_flush(&ip->prefix);
996 interface_write_resolv_conf();
997 }
998
999 void
1000 interface_ip_flush(struct interface_ip_settings *ip)
1001 {
1002 if (ip == &ip->iface->proto_ip)
1003 vlist_flush_all(&ip->iface->host_routes);
1004 vlist_simple_flush_all(&ip->dns_servers);
1005 vlist_simple_flush_all(&ip->dns_search);
1006 vlist_flush_all(&ip->route);
1007 vlist_flush_all(&ip->addr);
1008 vlist_flush_all(&ip->prefix);
1009 }
1010
1011 static void
1012 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1013 {
1014 ip->iface = iface;
1015 ip->enabled = true;
1016 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1017 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1018 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1019 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1020 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1021 }
1022
1023 void
1024 interface_ip_init(struct interface *iface)
1025 {
1026 __interface_ip_init(&iface->proto_ip, iface);
1027 __interface_ip_init(&iface->config_ip, iface);
1028 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1029
1030 }
1031
1032 static void
1033 interface_ip_valid_until_handler(struct uloop_timeout *t)
1034 {
1035 time_t now = system_get_rtime();
1036 struct interface *iface;
1037 vlist_for_each_element(&interfaces, iface, node) {
1038 if (iface->state != IFS_UP)
1039 continue;
1040
1041 struct device_addr *addr, *addrp;
1042 struct device_route *route, *routep;
1043 struct device_prefix *pref, *prefp;
1044
1045 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1046 if (addr->valid_until && addr->valid_until < now)
1047 vlist_delete(&iface->proto_ip.addr, &addr->node);
1048
1049 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1050 if (route->valid_until && route->valid_until < now)
1051 vlist_delete(&iface->proto_ip.route, &route->node);
1052
1053 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1054 if (pref->valid_until && pref->valid_until < now)
1055 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1056
1057 }
1058
1059 uloop_timeout_set(t, 1000);
1060 }
1061
1062 static void __init
1063 interface_ip_init_worker(void)
1064 {
1065 valid_until_timeout.cb = interface_ip_valid_until_handler;
1066 uloop_timeout_set(&valid_until_timeout, 1000);
1067 }
OpenWrt Network interface configuration daemon