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