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interface-ip: use ptp address as well to find local address target
[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 #ifdef linux
24 #include <netinet/ether.h>
25 #endif
26
27 #include "netifd.h"
28 #include "device.h"
29 #include "interface.h"
30 #include "interface-ip.h"
31 #include "proto.h"
32 #include "ubus.h"
33 #include "system.h"
34
35 enum {
36 ROUTE_INTERFACE,
37 ROUTE_TARGET,
38 ROUTE_MASK,
39 ROUTE_GATEWAY,
40 ROUTE_METRIC,
41 ROUTE_MTU,
42 ROUTE_VALID,
43 ROUTE_TABLE,
44 ROUTE_SOURCE,
45 ROUTE_ONLINK,
46 ROUTE_TYPE,
47 ROUTE_PROTO,
48 __ROUTE_MAX
49 };
50
51 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
52 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
53 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
54 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
55 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
56 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
57 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
58 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
59 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
60 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
61 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
62 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
63 [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
64 };
65
66 const struct uci_blob_param_list route_attr_list = {
67 .n_params = __ROUTE_MAX,
68 .params = route_attr,
69 };
70
71 enum {
72 NEIGHBOR_INTERFACE,
73 NEIGHBOR_ADDRESS,
74 NEIGHBOR_MAC,
75 NEIGHBOR_PROXY,
76 NEIGHBOR_ROUTER,
77 __NEIGHBOR_MAX
78 };
79
80 static const struct blobmsg_policy neighbor_attr[__NEIGHBOR_MAX]={
81 [NEIGHBOR_INTERFACE]= { .name = "interface", .type = BLOBMSG_TYPE_STRING},
82 [NEIGHBOR_ADDRESS]= { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING},
83 [NEIGHBOR_MAC]= { .name = "mac", .type = BLOBMSG_TYPE_STRING},
84 [NEIGHBOR_PROXY]= { .name = "proxy", .type = BLOBMSG_TYPE_BOOL},
85 [NEIGHBOR_ROUTER]= {.name = "router", .type = BLOBMSG_TYPE_BOOL},
86 };
87
88 const struct uci_blob_param_list neighbor_attr_list = {
89 .n_params = __NEIGHBOR_MAX,
90 .params = neighbor_attr,
91 };
92
93
94 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
95 static struct device_prefix *ula_prefix = NULL;
96 static struct uloop_timeout valid_until_timeout;
97
98
99 static void
100 clear_if_addr(union if_addr *a, int mask)
101 {
102 int m_bytes = (mask + 7) / 8;
103 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
104 uint8_t *p = (uint8_t *) a;
105
106 if (m_bytes < sizeof(*a))
107 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
108
109 p[m_bytes - 1] &= ~m_clear;
110 }
111
112 static bool
113 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
114 {
115 union if_addr *p1, *p2;
116
117 p1 = alloca(sizeof(*a1));
118 p2 = alloca(sizeof(*a2));
119
120 memcpy(p1, a1, sizeof(*a1));
121 clear_if_addr(p1, mask);
122 memcpy(p2, a2, sizeof(*a2));
123 clear_if_addr(p2, mask);
124
125 return !memcmp(p1, p2, sizeof(*p1));
126 }
127
128 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
129 const union if_addr *addr, uint8_t mask, unsigned int table,
130 struct interface *in_iface, const char *action, bool src)
131 {
132 struct iprule rule = {
133 .flags = IPRULE_PRIORITY,
134 .priority = priority
135 };
136
137 if (addr) {
138 if (src) {
139 rule.flags |= IPRULE_SRC;
140 rule.src_addr = *addr;
141 rule.src_mask = mask;
142 } else {
143 rule.flags |= IPRULE_DEST;
144 rule.dest_addr = *addr;
145 rule.dest_mask = mask;
146 }
147 }
148
149 if (table) {
150 rule.flags |= IPRULE_LOOKUP;
151 rule.lookup = table;
152
153 if (!rule.lookup)
154 return 0;
155 } else if (action) {
156 rule.flags |= IPRULE_ACTION;
157 system_resolve_iprule_action(action, &rule.action);
158 }
159
160 if (in_iface && in_iface->l3_dev.dev) {
161 rule.flags |= IPRULE_IN;
162 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
163 }
164
165 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
166
167 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
168 }
169
170 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
171 {
172 struct iprule rule = {
173 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
174 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
175 .lookup = (v6) ? iface->ip6table : iface->ip4table,
176 .in_dev = "lo"
177 };
178
179 if (!rule.lookup)
180 return 0;
181
182 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
183
184 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
185 }
186
187 static bool
188 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
189 {
190 struct device_addr *addr;
191
192 vlist_for_each_element(&ip->addr, addr, node) {
193 if (!addr->enabled)
194 continue;
195
196 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
197 continue;
198
199 if (((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
200 addr->point_to_point && a->in.s_addr == addr->point_to_point)
201 return true;
202
203 /* Handle offlink addresses correctly */
204 unsigned int mask = addr->mask;
205 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
206 (addr->flags & DEVADDR_OFFLINK))
207 mask = 128;
208
209 if (!match_if_addr(&addr->addr, a, mask))
210 continue;
211
212 return true;
213 }
214
215 return false;
216 }
217
218 static void
219 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
220 bool v6, struct device_route **res)
221 {
222 struct device_route *route;
223
224 vlist_for_each_element(&ip->route, route, node) {
225 if (!route->enabled)
226 continue;
227
228 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
229 continue;
230
231 if (!match_if_addr(&route->addr, a, route->mask))
232 continue;
233
234 if (route->flags & DEVROUTE_TABLE)
235 continue;
236
237 if (!*res || route->mask > (*res)->mask)
238 *res = route;
239 }
240 }
241
242 static bool
243 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
244 {
245 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
246 __find_ip_addr_target(&iface->config_ip, a, v6);
247 }
248
249 static void
250 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
251 bool v6, struct device_route **route)
252 {
253 __find_ip_route_target(&iface->proto_ip, a, v6, route);
254 __find_ip_route_target(&iface->config_ip, a, v6, route);
255 }
256
257 struct interface *
258 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
259 {
260 struct device_route *route, *r_next = NULL;
261 bool defaultroute_target = false;
262 union if_addr addr_zero;
263 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
264
265 memset(&addr_zero, 0, sizeof(addr_zero));
266 if (memcmp(&addr_zero, addr, addrsize) == 0)
267 defaultroute_target = true;
268
269 if (iface) {
270 /* look for locally addressable target first */
271 if (interface_ip_find_addr_target(iface, addr, v6))
272 return iface;
273
274 /* do not stop at the first route, let the lookup compare
275 * masks to find the best match */
276 interface_ip_find_route_target(iface, addr, v6, &r_next);
277 } else {
278 vlist_for_each_element(&interfaces, iface, node) {
279 /* look for locally addressable target first */
280 if (interface_ip_find_addr_target(iface, addr, v6))
281 return iface;
282
283 /* do not stop at the first route, let the lookup compare
284 * masks to find the best match */
285 interface_ip_find_route_target(iface, addr, v6, &r_next);
286 }
287 }
288
289 if (!r_next)
290 return NULL;
291
292 iface = r_next->iface;
293 if (defaultroute_target)
294 return iface;
295
296 route = calloc(1, sizeof(*route));
297 if (!route)
298 return NULL;
299
300 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
301 route->mask = v6 ? 128 : 32;
302 memcpy(&route->addr, addr, addrsize);
303 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
304 route->mtu = r_next->mtu;
305 route->metric = r_next->metric;
306 route->table = r_next->table;
307 route->iface = iface;
308 vlist_add(&iface->host_routes, &route->node, route);
309
310 return iface;
311 }
312
313 static void
314 interface_set_route_info(struct interface *iface, struct device_route *route)
315 {
316 bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
317
318 if (!iface)
319 return;
320
321 if (!(route->flags & DEVROUTE_METRIC))
322 route->metric = iface->metric;
323
324 if (!(route->flags & DEVROUTE_TABLE)) {
325 route->table = (v6) ? iface->ip6table : iface->ip4table;
326 if (route->table)
327 route->flags |= DEVROUTE_SRCTABLE;
328 }
329 }
330
331 void
332 interface_ip_add_neighbor(struct interface *iface, struct blob_attr *attr, bool v6)
333 {
334 struct interface_ip_settings *ip;
335 struct blob_attr *tb[__NEIGHBOR_MAX], *cur;
336 struct device_neighbor *neighbor;
337 int af = v6 ? AF_INET6: AF_INET;
338 struct ether_addr *ea;
339
340 blobmsg_parse(neighbor_attr, __NEIGHBOR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
341
342 if (!iface) {
343 if ((cur = tb[NEIGHBOR_INTERFACE]) == NULL)
344 return;
345
346 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
347
348 if (!iface)
349 return;
350
351 ip = &iface->config_ip;
352 } else
353 ip = &iface->proto_ip;
354
355 neighbor = calloc(1,sizeof(*neighbor));
356 neighbor->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
357
358 if (!neighbor)
359 return;
360
361 if ((cur = tb[NEIGHBOR_ADDRESS]) != NULL){
362 if (!inet_pton(af, blobmsg_data(cur), &neighbor->addr))
363 goto error;
364 } else
365 goto error;
366
367 if ((cur = tb[NEIGHBOR_MAC]) != NULL) {
368 neighbor->flags |= DEVNEIGH_MAC;
369 ea = ether_aton(blobmsg_data(cur));
370 if (!ea)
371 goto error;
372
373 memcpy(neighbor->macaddr, ea, 6);
374 }
375
376 if ((cur = tb[NEIGHBOR_PROXY]) != NULL)
377 neighbor->proxy = blobmsg_get_bool(cur);
378
379 if ((cur = tb[NEIGHBOR_ROUTER]) != NULL)
380 neighbor->router = blobmsg_get_bool(cur);
381
382 vlist_add(&ip->neighbor, &neighbor->node, neighbor);
383 return;
384
385 error:
386 free(neighbor);
387 }
388
389 void
390 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
391 {
392 struct interface_ip_settings *ip;
393 struct blob_attr *tb[__ROUTE_MAX], *cur;
394 struct device_route *route;
395 int af = v6 ? AF_INET6 : AF_INET;
396
397 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
398
399 if (!iface) {
400 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
401 return;
402
403 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
404 if (!iface)
405 return;
406
407 ip = &iface->config_ip;
408 } else {
409 ip = &iface->proto_ip;
410 }
411
412 route = calloc(1, sizeof(*route));
413 if (!route)
414 return;
415
416 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
417 route->mask = v6 ? 128 : 32;
418 if ((cur = tb[ROUTE_MASK]) != NULL) {
419 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
420 if (route->mask > (v6 ? 128 : 32))
421 goto error;
422 }
423
424 if ((cur = tb[ROUTE_TARGET]) != NULL) {
425 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
426 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
427 goto error;
428 }
429 }
430
431 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
432 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
433 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
434 goto error;
435 }
436 }
437
438 if ((cur = tb[ROUTE_METRIC]) != NULL) {
439 route->metric = blobmsg_get_u32(cur);
440 route->flags |= DEVROUTE_METRIC;
441 }
442
443 if ((cur = tb[ROUTE_MTU]) != NULL) {
444 route->mtu = blobmsg_get_u32(cur);
445 route->flags |= DEVROUTE_MTU;
446 }
447
448 /* Use source-based routing */
449 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
450 char *saveptr, *source = alloca(blobmsg_data_len(cur));
451 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
452
453 const char *addr = strtok_r(source, "/", &saveptr);
454 const char *mask = strtok_r(NULL, "/", &saveptr);
455
456 if (!addr || inet_pton(af, addr, &route->source) < 1) {
457 DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
458 goto error;
459 }
460
461 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
462 }
463
464 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
465 route->flags |= DEVROUTE_ONLINK;
466
467 if ((cur = tb[ROUTE_TABLE]) != NULL) {
468 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
469 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
470 goto error;
471 }
472
473 /* only set the table flag if not using the main (default) table */
474 if (system_is_default_rt_table(route->table))
475 route->table = 0;
476
477 if (route->table)
478 route->flags |= DEVROUTE_TABLE;
479 }
480
481 if ((cur = tb[ROUTE_VALID]) != NULL) {
482 int64_t valid = blobmsg_get_u32(cur);
483 int64_t valid_until = valid + (int64_t)system_get_rtime();
484 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) /* Catch overflow */
485 route->valid_until = valid_until;
486 }
487
488 if ((cur = tb[ROUTE_TYPE]) != NULL) {
489 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
490 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
491 goto error;
492 }
493 route->flags |= DEVROUTE_TYPE;
494 }
495
496 if ((cur = tb[ROUTE_PROTO]) != NULL) {
497 if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
498 DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
499 goto error;
500 }
501 route->flags |= DEVROUTE_PROTO;
502 }
503
504 interface_set_route_info(iface, route);
505 vlist_add(&ip->route, &route->node, route);
506 return;
507
508 error:
509 free(route);
510 }
511
512 static int
513 addr_cmp(const void *k1, const void *k2, void *ptr)
514 {
515 return memcmp(k1, k2, sizeof(struct device_addr) -
516 offsetof(struct device_addr, flags));
517 }
518
519 static int
520 neighbor_cmp(const void *k1, const void *k2, void *ptr)
521 {
522 const struct device_neighbor *n1 = k1, *n2 = k2;
523
524 return memcmp(&n1->addr, &n2->addr, sizeof(n2->addr));
525 }
526
527 static int
528 route_cmp(const void *k1, const void *k2, void *ptr)
529 {
530 const struct device_route *r1 = k1, *r2 = k2;
531
532 if (r1->mask != r2->mask)
533 return r2->mask - r1->mask;
534
535 if (r1->metric != r2->metric)
536 return r1->metric - r2->metric;
537
538 if (r1->flags != r2->flags)
539 return r2->flags - r1->flags;
540
541 if (r1->sourcemask != r2->sourcemask)
542 return r1->sourcemask - r2->sourcemask;
543
544 if (r1->table != r2->table)
545 return r1->table - r2->table;
546
547 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
548 if (maskcmp)
549 return maskcmp;
550
551 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
552 }
553
554 static int
555 prefix_cmp(const void *k1, const void *k2, void *ptr)
556 {
557 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
558 offsetof(struct device_prefix, addr));
559 }
560
561 static void
562 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
563 {
564 struct device *dev = iface->l3_dev.dev;
565 struct device_route *r = &addr->subnet;
566
567 if (addr->flags & DEVADDR_OFFLINK)
568 return;
569
570 if (!add) {
571 if (!addr->subnet.iface)
572 return;
573
574 system_del_route(dev, r);
575 memset(r, 0, sizeof(*r));
576 return;
577 }
578
579 r->iface = iface;
580 r->flags = addr->flags;
581 r->mask = addr->mask;
582 memcpy(&r->addr, &addr->addr, sizeof(r->addr));
583 clear_if_addr(&r->addr, r->mask);
584
585 if (!system_resolve_rt_proto("kernel", &r->proto))
586 return;
587
588 r->flags |= DEVROUTE_PROTO;
589 system_del_route(dev, r);
590
591 r->flags &= ~DEVROUTE_PROTO;
592 interface_set_route_info(iface, r);
593
594 system_add_route(dev, r);
595 }
596
597 static void
598 interface_add_addr_rules(struct device_addr *addr, bool enabled)
599 {
600 bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
601
602 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
603 (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
604 true);
605 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
606 &addr->addr, addr->mask, addr->policy_table, NULL,
607 NULL, false);
608 }
609
610 static void
611 interface_update_proto_addr(struct vlist_tree *tree,
612 struct vlist_node *node_new,
613 struct vlist_node *node_old)
614 {
615 struct interface_ip_settings *ip;
616 struct interface *iface;
617 struct device *dev;
618 struct device_addr *a_new = NULL, *a_old = NULL;
619 bool replace = false;
620 bool keep = false;
621 bool v6 = false;
622
623 ip = container_of(tree, struct interface_ip_settings, addr);
624 iface = ip->iface;
625 dev = iface->l3_dev.dev;
626
627 if (!node_new || !node_old)
628 iface->updated |= IUF_ADDRESS;
629
630 if (node_new) {
631 a_new = container_of(node_new, struct device_addr, node);
632
633 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
634 !a_new->broadcast) {
635
636 /* /31 and /32 addressing need 255.255.255.255
637 * as broadcast address. */
638 if (a_new->mask >= 31) {
639 a_new->broadcast = (uint32_t) ~0;
640 } else {
641 uint32_t mask = ~0;
642 uint32_t *a = (uint32_t *) &a_new->addr;
643
644 mask >>= a_new->mask;
645 a_new->broadcast = *a | htonl(mask);
646 }
647 }
648 }
649
650 if (node_old)
651 a_old = container_of(node_old, struct device_addr, node);
652
653 if (a_new && a_old) {
654 keep = true;
655
656 if (a_old->flags != a_new->flags || a_old->failed)
657 keep = false;
658
659 if (a_old->valid_until != a_new->valid_until ||
660 a_old->preferred_until != a_new->preferred_until)
661 replace = true;
662
663 if (((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
664 (a_new->broadcast != a_old->broadcast ||
665 a_new->point_to_point != a_old->point_to_point))
666 keep = false;
667 }
668
669 if (node_old) {
670 if (a_old->enabled && !keep) {
671 /*
672 * This is needed for source routing to work correctly. If a device
673 * has two connections to a network using the same subnet, adding
674 * only the network-rule will cause packets to be routed through the
675 * first matching network (source IP matches both masks)
676 */
677 if (a_old->policy_table)
678 interface_add_addr_rules(a_old, false);
679
680 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
681 interface_handle_subnet_route(iface, a_old, false);
682 system_del_address(dev, a_old);
683 }
684 }
685 free(a_old->pclass);
686 free(a_old);
687 }
688
689 if (node_new) {
690 a_new->enabled = true;
691
692 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
693 v6 = true;
694
695 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
696
697 if (!keep || replace) {
698 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
699 if (system_add_address(dev, a_new))
700 a_new->failed = true;
701
702 if (iface->metric || a_new->policy_table)
703 interface_handle_subnet_route(iface, a_new, true);
704 }
705
706 if (!keep) {
707 if (a_new->policy_table)
708 interface_add_addr_rules(a_new, true);
709 }
710 }
711 }
712 }
713
714 static bool
715 enable_route(struct interface_ip_settings *ip, struct device_route *route)
716 {
717 if (ip->no_defaultroute && !route->mask)
718 return false;
719
720 return ip->enabled;
721 }
722
723 static void
724 interface_update_proto_neighbor(struct vlist_tree *tree,
725 struct vlist_node * node_new,
726 struct vlist_node *node_old)
727 {
728 struct device *dev;
729 struct device_neighbor *neighbor_old, *neighbor_new;
730 struct interface_ip_settings *ip;
731 bool keep = false;
732
733 ip = container_of(tree, struct interface_ip_settings, neighbor);
734 dev = ip->iface->l3_dev.dev;
735
736 neighbor_old = container_of(node_old, struct device_neighbor, node);
737 neighbor_new = container_of(node_new, struct device_neighbor, node);
738
739 if (node_old && node_new) {
740 keep = (!memcmp(neighbor_old->macaddr, neighbor_new->macaddr, sizeof(neighbor_old->macaddr)) &&
741 (neighbor_old->proxy == neighbor_new->proxy) &&
742 (neighbor_old->router == neighbor_new->router));
743 }
744
745 if (node_old) {
746 if (!keep && neighbor_old->enabled)
747 system_del_neighbor(dev, neighbor_old);
748
749 free(neighbor_old);
750 }
751
752 if (node_new) {
753 if (!keep && ip->enabled)
754 if (system_add_neighbor(dev, neighbor_new))
755 neighbor_new->failed = true;
756
757 neighbor_new->enabled = ip->enabled;
758 }
759 }
760
761 static void
762 interface_update_proto_route(struct vlist_tree *tree,
763 struct vlist_node *node_new,
764 struct vlist_node *node_old)
765 {
766 struct interface_ip_settings *ip;
767 struct interface *iface;
768 struct device *dev;
769 struct device_route *route_old, *route_new;
770 bool keep = false;
771
772 ip = container_of(tree, struct interface_ip_settings, route);
773 iface = ip->iface;
774 dev = iface->l3_dev.dev;
775
776 if (!node_new || !node_old)
777 iface->updated |= IUF_ROUTE;
778
779 route_old = container_of(node_old, struct device_route, node);
780 route_new = container_of(node_new, struct device_route, node);
781
782 if (node_old && node_new)
783 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
784 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
785 (route_old->proto == route_new->proto) && !route_old->failed;
786
787 if (node_old) {
788 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
789 system_del_route(dev, route_old);
790
791 free(route_old);
792 }
793
794 if (node_new) {
795 bool _enabled = enable_route(ip, route_new);
796
797 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
798 if (system_add_route(dev, route_new))
799 route_new->failed = true;
800
801 route_new->iface = iface;
802 route_new->enabled = _enabled;
803 }
804 }
805
806 static void
807 interface_update_host_route(struct vlist_tree *tree,
808 struct vlist_node *node_new,
809 struct vlist_node *node_old)
810 {
811 struct interface *iface;
812 struct device *dev;
813 struct device_route *route_old, *route_new;
814
815 iface = container_of(tree, struct interface, host_routes);
816 dev = iface->l3_dev.dev;
817
818 route_old = container_of(node_old, struct device_route, node);
819 route_new = container_of(node_new, struct device_route, node);
820
821 if (node_old) {
822 system_del_route(dev, route_old);
823 free(route_old);
824 }
825
826 if (node_new) {
827 if (system_add_route(dev, route_new))
828 route_new->failed = true;
829 }
830 }
831
832 static void
833 random_ifaceid(struct in6_addr *addr)
834 {
835 static bool initialized = false;
836 struct timeval t;
837
838 if (!initialized) {
839 long int seed = 0;
840 gettimeofday(&t, NULL);
841 seed = t.tv_sec ^ t.tv_usec ^ getpid();
842 srand48(seed);
843 initialized = true;
844 }
845 addr->s6_addr32[2] = (uint32_t)mrand48();
846 addr->s6_addr32[3] = (uint32_t)mrand48();
847 }
848
849 static bool
850 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
851 {
852 struct device_settings st;
853
854 device_merge_settings(iface->l3_dev.dev, &st);
855
856 if (!(st.flags & DEV_OPT_MACADDR))
857 return false;
858
859 /* get mac address */
860 uint8_t *ifaceid = addr->s6_addr + 8;
861 memcpy(ifaceid, st.macaddr, 3);
862 memcpy(ifaceid + 5, st.macaddr + 3, 3);
863 ifaceid[3] = 0xff;
864 ifaceid[4] = 0xfe;
865 ifaceid[0] ^= 0x02;
866
867 return true;
868 }
869
870 static bool
871 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
872 {
873 bool ret = true;
874
875 /* generate new iface id */
876 switch (iface->assignment_iface_id_selection) {
877 case IFID_FIXED:
878 /* fixed */
879 /* copy host part from assignment_fixed_iface_id */
880 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
881 break;
882 case IFID_RANDOM:
883 /* randomize last 64 bits */
884 random_ifaceid(addr);
885 break;
886 case IFID_EUI64:
887 /* eui64 */
888 ret = eui64_ifaceid(iface, addr);
889 break;
890 default:
891 ret = false;
892 break;
893 }
894 return ret;
895 }
896
897 static void
898 interface_set_prefix_address(struct device_prefix_assignment *assignment,
899 const struct device_prefix *prefix, struct interface *iface, bool add)
900 {
901 const struct interface *uplink = prefix->iface;
902 if (!iface->l3_dev.dev)
903 return;
904
905 struct device *l3_downlink = iface->l3_dev.dev;
906
907 struct device_addr addr;
908 struct device_route route;
909 memset(&addr, 0, sizeof(addr));
910 memset(&route, 0, sizeof(route));
911
912 addr.addr.in6 = assignment->addr;
913 addr.mask = assignment->length;
914 addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
915 addr.preferred_until = prefix->preferred_until;
916 addr.valid_until = prefix->valid_until;
917
918 route.flags = DEVADDR_INET6;
919 route.mask = addr.mask < 64 ? 64 : addr.mask;
920 route.addr = addr.addr;
921
922 if (!add && assignment->enabled) {
923 time_t now = system_get_rtime();
924
925 addr.preferred_until = now;
926 if (!addr.valid_until || addr.valid_until - now > 7200)
927 addr.valid_until = now + 7200;
928
929 if (iface->ip6table)
930 set_ip_source_policy(false, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
931 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
932
933 if (prefix->iface) {
934 if (prefix->iface->ip6table)
935 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
936 addr.mask, prefix->iface->ip6table, iface, NULL, true);
937
938 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
939 addr.mask, 0, iface, "unreachable", true);
940 }
941
942 clear_if_addr(&route.addr, route.mask);
943 interface_set_route_info(iface, &route);
944
945 system_del_route(l3_downlink, &route);
946 system_add_address(l3_downlink, &addr);
947
948 assignment->addr = in6addr_any;
949 assignment->enabled = false;
950 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
951 if (IN6_IS_ADDR_UNSPECIFIED(&addr.addr.in6)) {
952 addr.addr.in6 = prefix->addr;
953 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
954 if (!generate_ifaceid(iface, &addr.addr.in6))
955 return;
956
957 assignment->addr = addr.addr.in6;
958 route.addr = addr.addr;
959 }
960
961 if (system_add_address(l3_downlink, &addr))
962 return;
963
964 if (!assignment->enabled) {
965 if (iface->ip6table)
966 set_ip_source_policy(true, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
967 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
968
969 if (prefix->iface) {
970 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
971 addr.mask, 0, iface, "unreachable", true);
972
973 if (prefix->iface->ip6table)
974 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
975 addr.mask, prefix->iface->ip6table, iface, NULL, true);
976 }
977 }
978
979 clear_if_addr(&route.addr, route.mask);
980 interface_set_route_info(iface, &route);
981
982 system_add_route(l3_downlink, &route);
983
984 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
985 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
986 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
987
988 if (mtu > 0 && mtu_old != mtu) {
989 if (system_update_ipv6_mtu(l3_downlink, mtu) < 0 && mtu < mtu_old)
990 netifd_log_message(L_WARNING, "Failed to set IPv6 mtu to %d "
991 "on interface '%s'\n", mtu, iface->name);
992 }
993 }
994
995 assignment->enabled = true;
996 }
997 }
998
999 static bool interface_prefix_assign(struct list_head *list,
1000 struct device_prefix_assignment *assign)
1001 {
1002 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
1003 struct device_prefix_assignment *c;
1004 list_for_each_entry(c, list, head) {
1005 if (assign->assigned != -1) {
1006 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
1007 list_add_tail(&assign->head, &c->head);
1008 return true;
1009 }
1010 } else if (assign->assigned == -1) {
1011 current = (current + asize) & (~asize);
1012 if (current + asize < c->assigned) {
1013 assign->assigned = current;
1014 list_add_tail(&assign->head, &c->head);
1015 return true;
1016 }
1017 }
1018 current = (c->assigned + (1 << (64 - c->length)));
1019 }
1020 return false;
1021 }
1022
1023 /*
1024 * Sorting of assignment entries:
1025 * Primary on assignment length: smallest assignment first
1026 * Secondary on assignment weight: highest weight first
1027 * Finally alphabetical order of interface names
1028 */
1029 static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
1030 {
1031 const struct device_prefix_assignment *a1 = k1, *a2 = k2;
1032
1033 if (a1->length != a2->length)
1034 return a1->length - a2->length;
1035
1036 if (a1->weight != a2->weight)
1037 return a2->weight - a1->weight;
1038
1039 return strcmp(a1->name, a2->name);
1040 }
1041
1042 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
1043 {
1044 struct device_prefix_assignment *c;
1045 struct interface *iface;
1046
1047 /* Delete all assignments */
1048 while (!list_empty(&prefix->assignments)) {
1049 c = list_first_entry(&prefix->assignments,
1050 struct device_prefix_assignment, head);
1051 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1052 interface_set_prefix_address(c, prefix, iface, false);
1053 list_del(&c->head);
1054 free(c);
1055 }
1056
1057 if (!setup)
1058 return;
1059
1060 /* End-of-assignment sentinel */
1061 c = malloc(sizeof(*c) + 1);
1062 if (!c)
1063 return;
1064
1065 c->assigned = 1 << (64 - prefix->length);
1066 c->length = 64;
1067 c->name[0] = 0;
1068 c->addr = in6addr_any;
1069 list_add(&c->head, &prefix->assignments);
1070
1071 /* Excluded prefix */
1072 if (prefix->excl_length > 0) {
1073 const char name[] = "!excluded";
1074 c = malloc(sizeof(*c) + sizeof(name));
1075 if (c) {
1076 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
1077 ((1 << (64 - prefix->length)) - 1);
1078 c->length = prefix->excl_length;
1079 c->addr = in6addr_any;
1080 memcpy(c->name, name, sizeof(name));
1081 list_add(&c->head, &prefix->assignments);
1082 }
1083 }
1084
1085 bool assigned_any = false;
1086 struct {
1087 struct avl_node node;
1088 } *entry, *n_entry;
1089 struct avl_tree assign_later;
1090
1091 avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
1092
1093 vlist_for_each_element(&interfaces, iface, node) {
1094 if (iface->assignment_length < 48 ||
1095 iface->assignment_length > 64)
1096 continue;
1097
1098 /* Test whether there is a matching class */
1099 if (!list_empty(&iface->assignment_classes)) {
1100 bool found = false;
1101
1102 struct interface_assignment_class *c;
1103 list_for_each_entry(c, &iface->assignment_classes, head) {
1104 if (!strcmp(c->name, prefix->pclass)) {
1105 found = true;
1106 break;
1107 }
1108 }
1109
1110 if (!found)
1111 continue;
1112 }
1113
1114 size_t namelen = strlen(iface->name) + 1;
1115 c = malloc(sizeof(*c) + namelen);
1116 if (!c)
1117 continue;
1118
1119 c->length = iface->assignment_length;
1120 c->assigned = iface->assignment_hint;
1121 c->weight = iface->assignment_weight;
1122 c->addr = in6addr_any;
1123 c->enabled = false;
1124 memcpy(c->name, iface->name, namelen);
1125
1126 /* First process all custom assignments, put all others in later-list */
1127 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
1128 if (c->assigned != -1) {
1129 c->assigned = -1;
1130 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
1131 "of size %hhu for %s, trying other\n", c->length, c->name);
1132 }
1133
1134 entry = calloc(1, sizeof(*entry));
1135 if (!entry) {
1136 free(c);
1137 continue;
1138 }
1139
1140 entry->node.key = c;
1141 avl_insert(&assign_later, &entry->node);
1142 }
1143
1144 if (c->assigned != -1)
1145 assigned_any = true;
1146 }
1147
1148 /* Then try to assign all other + failed custom assignments */
1149 avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
1150 bool assigned = false;
1151
1152 c = (struct device_prefix_assignment *)entry->node.key;
1153 avl_delete(&assign_later, &entry->node);
1154
1155 do {
1156 assigned = interface_prefix_assign(&prefix->assignments, c);
1157 } while (!assigned && ++c->length <= 64);
1158
1159 if (!assigned) {
1160 netifd_log_message(L_WARNING, "Failed to assign subprefix "
1161 "of size %hhu for %s\n", c->length, c->name);
1162 free(c);
1163 } else
1164 assigned_any = true;
1165
1166 free(entry);
1167 }
1168
1169 list_for_each_entry(c, &prefix->assignments, head)
1170 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1171 interface_set_prefix_address(c, prefix, iface, true);
1172
1173 if (!assigned_any)
1174 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
1175 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
1176 }
1177
1178
1179 void interface_refresh_assignments(bool hint)
1180 {
1181 static bool refresh = false;
1182 if (!hint && refresh) {
1183 struct device_prefix *p;
1184 list_for_each_entry(p, &prefixes, head)
1185 interface_update_prefix_assignments(p, true);
1186 }
1187 refresh = hint;
1188 }
1189
1190 void interface_update_prefix_delegation(struct interface_ip_settings *ip)
1191 {
1192 struct device_prefix *prefix;
1193
1194 vlist_for_each_element(&ip->prefix, prefix, node) {
1195 interface_update_prefix_assignments(prefix, !ip->no_delegation);
1196
1197 if (ip->no_delegation) {
1198 if (prefix->head.next)
1199 list_del(&prefix->head);
1200 } else
1201 list_add(&prefix->head, &prefixes);
1202 }
1203 }
1204
1205 static void
1206 interface_update_prefix(struct vlist_tree *tree,
1207 struct vlist_node *node_new,
1208 struct vlist_node *node_old)
1209 {
1210 struct device_prefix *prefix_old, *prefix_new;
1211 prefix_old = container_of(node_old, struct device_prefix, node);
1212 prefix_new = container_of(node_new, struct device_prefix, node);
1213
1214 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
1215 if (tree && (!node_new || !node_old))
1216 ip->iface->updated |= IUF_PREFIX;
1217
1218 struct device_route route;
1219 memset(&route, 0, sizeof(route));
1220 route.flags = DEVADDR_INET6;
1221 route.metric = INT32_MAX;
1222 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
1223 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
1224
1225
1226 struct device_prefix_assignment *c;
1227 struct interface *iface;
1228
1229 if (node_old && node_new) {
1230 /* Move assignments and refresh addresses to update valid times */
1231 list_splice(&prefix_old->assignments, &prefix_new->assignments);
1232
1233 list_for_each_entry(c, &prefix_new->assignments, head)
1234 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1235 interface_set_prefix_address(c, prefix_new, iface, true);
1236
1237 if (prefix_new->preferred_until != prefix_old->preferred_until ||
1238 prefix_new->valid_until != prefix_old->valid_until)
1239 ip->iface->updated |= IUF_PREFIX;
1240 } else if (node_new) {
1241 /* Set null-route to avoid routing loops */
1242 system_add_route(NULL, &route);
1243
1244 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
1245 interface_update_prefix_assignments(prefix_new, true);
1246 } else if (node_old) {
1247 /* Remove null-route */
1248 interface_update_prefix_assignments(prefix_old, false);
1249 system_del_route(NULL, &route);
1250 }
1251
1252 if (node_old) {
1253 if (prefix_old->head.next)
1254 list_del(&prefix_old->head);
1255 free(prefix_old);
1256 }
1257
1258 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1259 list_add(&prefix_new->head, &prefixes);
1260
1261 }
1262
1263 struct device_prefix*
1264 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1265 uint8_t length, time_t valid_until, time_t preferred_until,
1266 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1267 {
1268 if (!pclass)
1269 pclass = (iface) ? iface->name : "local";
1270
1271 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1272 if (!prefix)
1273 return NULL;
1274
1275 prefix->length = length;
1276 prefix->addr = *addr;
1277 prefix->preferred_until = preferred_until;
1278 prefix->valid_until = valid_until;
1279 prefix->iface = iface;
1280 INIT_LIST_HEAD(&prefix->assignments);
1281
1282 if (excl_addr) {
1283 prefix->excl_addr = *excl_addr;
1284 prefix->excl_length = excl_length;
1285 }
1286
1287 strcpy(prefix->pclass, pclass);
1288
1289 if (iface)
1290 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1291 else
1292 interface_update_prefix(NULL, &prefix->node, NULL);
1293
1294 return prefix;
1295 }
1296
1297 void
1298 interface_ip_set_ula_prefix(const char *prefix)
1299 {
1300 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1301 if (prefix)
1302 strncpy(buf, prefix, sizeof(buf) - 1);
1303 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1304
1305 struct in6_addr addr;
1306 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1307 if (ula_prefix) {
1308 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1309 ula_prefix = NULL;
1310 }
1311 return;
1312 }
1313
1314 int length;
1315 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1316 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1317 return;
1318
1319 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1320 ula_prefix->length != length) {
1321 if (ula_prefix)
1322 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1323
1324 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1325 0, 0, NULL, 0, NULL);
1326 }
1327 }
1328
1329 static void
1330 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1331 {
1332 struct dns_server *s;
1333
1334 s = calloc(1, sizeof(*s));
1335 if (!s)
1336 return;
1337
1338 s->af = AF_INET;
1339 if (inet_pton(s->af, str, &s->addr.in))
1340 goto add;
1341
1342 s->af = AF_INET6;
1343 if (inet_pton(s->af, str, &s->addr.in))
1344 goto add;
1345
1346 free(s);
1347 return;
1348
1349 add:
1350 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1351 s->af == AF_INET6 ? '6' : '4', str);
1352 vlist_simple_add(&ip->dns_servers, &s->node);
1353 }
1354
1355 void
1356 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1357 {
1358 struct blob_attr *cur;
1359 int rem;
1360
1361 blobmsg_for_each_attr(cur, list, rem) {
1362 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1363 continue;
1364
1365 if (!blobmsg_check_attr(cur, false))
1366 continue;
1367
1368 interface_add_dns_server(ip, blobmsg_data(cur));
1369 }
1370 }
1371
1372 static void
1373 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1374 {
1375 struct dns_search_domain *s;
1376 int len = strlen(str);
1377
1378 s = calloc(1, sizeof(*s) + len + 1);
1379 if (!s)
1380 return;
1381
1382 D(INTERFACE, "Add DNS search domain: %s\n", str);
1383 memcpy(s->name, str, len);
1384 vlist_simple_add(&ip->dns_search, &s->node);
1385 }
1386
1387 void
1388 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1389 {
1390 struct blob_attr *cur;
1391 int rem;
1392
1393 blobmsg_for_each_attr(cur, list, rem) {
1394 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1395 continue;
1396
1397 if (!blobmsg_check_attr(cur, false))
1398 continue;
1399
1400 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1401 }
1402 }
1403
1404 static void
1405 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1406 {
1407 struct dns_server *s;
1408 struct dns_search_domain *d;
1409 const char *str;
1410 char buf[INET6_ADDRSTRLEN];
1411
1412 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1413 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1414 if (!str)
1415 continue;
1416
1417 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1418 fprintf(f, "nameserver %s%%%s\n", str, dev);
1419 else
1420 fprintf(f, "nameserver %s\n", str);
1421 }
1422
1423 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1424 fprintf(f, "search %s\n", d->name);
1425 }
1426 }
1427
1428 /* Sorting of interface resolver entries : */
1429 /* Primary on interface dns_metric : lowest metric first */
1430 /* Secondary on interface metric : lowest metric first */
1431 /* Finally alphabetical order of interface names */
1432 static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
1433 {
1434 const struct interface *iface1 = k1, *iface2 = k2;
1435
1436 if (iface1->dns_metric != iface2->dns_metric)
1437 return iface1->dns_metric - iface2->dns_metric;
1438
1439 if (iface1->metric != iface2->metric)
1440 return iface1->metric - iface2->metric;
1441
1442 return strcmp(iface1->name, iface2->name);
1443 }
1444
1445 static void
1446 __interface_write_dns_entries(FILE *f)
1447 {
1448 struct interface *iface;
1449 struct {
1450 struct avl_node node;
1451 } *entry, *n_entry;
1452 struct avl_tree resolv_conf_iface_entries;
1453
1454 avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
1455
1456 vlist_for_each_element(&interfaces, iface, node) {
1457 if (iface->state != IFS_UP)
1458 continue;
1459
1460 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1461 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1462 vlist_simple_empty(&iface->config_ip.dns_search) &&
1463 vlist_simple_empty(&iface->config_ip.dns_servers))
1464 continue;
1465
1466 entry = calloc(1, sizeof(*entry));
1467 if (!entry)
1468 continue;
1469
1470 entry->node.key = iface;
1471 avl_insert(&resolv_conf_iface_entries, &entry->node);
1472 }
1473
1474 avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
1475 iface = (struct interface *)entry->node.key;
1476 struct device *dev = iface->l3_dev.dev;
1477
1478 fprintf(f, "# Interface %s\n", iface->name);
1479
1480 write_resolv_conf_entries(f, &iface->config_ip, dev->ifname);
1481
1482 if (!iface->proto_ip.no_dns)
1483 write_resolv_conf_entries(f, &iface->proto_ip, dev->ifname);
1484 }
1485
1486 avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
1487 free(entry);
1488 }
1489
1490 void
1491 interface_write_resolv_conf(void)
1492 {
1493 char *path = alloca(strlen(resolv_conf) + 5);
1494 FILE *f;
1495 uint32_t crcold, crcnew;
1496
1497 sprintf(path, "%s.tmp", resolv_conf);
1498 unlink(path);
1499 f = fopen(path, "w+");
1500 if (!f) {
1501 D(INTERFACE, "Failed to open %s for writing\n", path);
1502 return;
1503 }
1504
1505 __interface_write_dns_entries(f);
1506
1507 fflush(f);
1508 rewind(f);
1509 crcnew = crc32_file(f);
1510 fclose(f);
1511
1512 crcold = crcnew + 1;
1513 f = fopen(resolv_conf, "r");
1514 if (f) {
1515 crcold = crc32_file(f);
1516 fclose(f);
1517 }
1518
1519 if (crcold == crcnew) {
1520 unlink(path);
1521 } else if (rename(path, resolv_conf) < 0) {
1522 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1523 unlink(path);
1524 }
1525 }
1526
1527 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1528 {
1529 struct device_addr *addr;
1530 struct device_route *route;
1531 struct device_neighbor *neighbor;
1532 struct device *dev;
1533 struct interface *iface;
1534
1535 ip->enabled = enabled;
1536 iface = ip->iface;
1537 dev = iface->l3_dev.dev;
1538 if (!dev)
1539 return;
1540
1541 vlist_for_each_element(&ip->addr, addr, node) {
1542 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1543
1544 if (addr->flags & DEVADDR_EXTERNAL)
1545 continue;
1546
1547 if (addr->enabled == enabled)
1548 continue;
1549
1550 if (enabled) {
1551 system_add_address(dev, addr);
1552
1553 addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1554 if (iface->metric || addr->policy_table)
1555 interface_handle_subnet_route(iface, addr, true);
1556
1557 if (addr->policy_table)
1558 interface_add_addr_rules(addr, true);
1559 } else {
1560 interface_handle_subnet_route(iface, addr, false);
1561 system_del_address(dev, addr);
1562
1563 if (addr->policy_table)
1564 interface_add_addr_rules(addr, false);
1565 }
1566 addr->enabled = enabled;
1567 }
1568
1569 vlist_for_each_element(&ip->route, route, node) {
1570 bool _enabled = enabled;
1571
1572 if (route->flags & DEVADDR_EXTERNAL)
1573 continue;
1574
1575 if (!enable_route(ip, route))
1576 _enabled = false;
1577 if (route->enabled == _enabled)
1578 continue;
1579
1580 if (_enabled) {
1581 interface_set_route_info(ip->iface, route);
1582
1583 if (system_add_route(dev, route))
1584 route->failed = true;
1585 } else
1586 system_del_route(dev, route);
1587 route->enabled = _enabled;
1588 }
1589
1590 vlist_for_each_element(&ip->neighbor, neighbor, node) {
1591 if (neighbor->enabled == enabled)
1592 continue;
1593
1594 if (enabled) {
1595 if(system_add_neighbor(dev, neighbor))
1596 neighbor->failed = true;
1597 } else
1598 system_del_neighbor(dev, neighbor);
1599
1600 neighbor->enabled = enabled;
1601 }
1602
1603 struct device_prefix *c;
1604 struct device_prefix_assignment *a;
1605 list_for_each_entry(c, &prefixes, head)
1606 list_for_each_entry(a, &c->assignments, head)
1607 if (!strcmp(a->name, ip->iface->name))
1608 interface_set_prefix_address(a, c, ip->iface, enabled);
1609
1610 if (ip->iface->policy_rules_set != enabled &&
1611 ip->iface->l3_dev.dev) {
1612 set_ip_lo_policy(enabled, true, ip->iface);
1613 set_ip_lo_policy(enabled, false, ip->iface);
1614
1615 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1616 NULL, 0, 0, ip->iface, "failed_policy", true);
1617 ip->iface->policy_rules_set = enabled;
1618 }
1619 }
1620
1621 void
1622 interface_ip_update_start(struct interface_ip_settings *ip)
1623 {
1624 if (ip != &ip->iface->config_ip) {
1625 vlist_simple_update(&ip->dns_servers);
1626 vlist_simple_update(&ip->dns_search);
1627 }
1628 vlist_update(&ip->route);
1629 vlist_update(&ip->addr);
1630 vlist_update(&ip->prefix);
1631 vlist_update(&ip->neighbor);
1632 }
1633
1634 void
1635 interface_ip_update_complete(struct interface_ip_settings *ip)
1636 {
1637 vlist_simple_flush(&ip->dns_servers);
1638 vlist_simple_flush(&ip->dns_search);
1639 vlist_flush(&ip->route);
1640 vlist_flush(&ip->addr);
1641 vlist_flush(&ip->prefix);
1642 vlist_flush(&ip->neighbor);
1643 interface_write_resolv_conf();
1644 }
1645
1646 void
1647 interface_ip_flush(struct interface_ip_settings *ip)
1648 {
1649 if (ip == &ip->iface->proto_ip)
1650 vlist_flush_all(&ip->iface->host_routes);
1651 vlist_simple_flush_all(&ip->dns_servers);
1652 vlist_simple_flush_all(&ip->dns_search);
1653 vlist_flush_all(&ip->route);
1654 vlist_flush_all(&ip->addr);
1655 vlist_flush_all(&ip->neighbor);
1656 vlist_flush_all(&ip->prefix);
1657 }
1658
1659 static void
1660 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1661 {
1662 ip->iface = iface;
1663 ip->enabled = true;
1664 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1665 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1666 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1667 vlist_init(&ip->neighbor, neighbor_cmp, interface_update_proto_neighbor);
1668 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1669 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1670 }
1671
1672 void
1673 interface_ip_init(struct interface *iface)
1674 {
1675 __interface_ip_init(&iface->proto_ip, iface);
1676 __interface_ip_init(&iface->config_ip, iface);
1677 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1678 }
1679
1680 static void
1681 interface_ip_valid_until_handler(struct uloop_timeout *t)
1682 {
1683 time_t now = system_get_rtime();
1684 struct interface *iface;
1685 vlist_for_each_element(&interfaces, iface, node) {
1686 if (iface->state != IFS_UP)
1687 continue;
1688
1689 struct device_addr *addr, *addrp;
1690 struct device_route *route, *routep;
1691 struct device_prefix *pref, *prefp;
1692
1693 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1694 if (addr->valid_until && addr->valid_until < now)
1695 vlist_delete(&iface->proto_ip.addr, &addr->node);
1696
1697 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1698 if (route->valid_until && route->valid_until < now)
1699 vlist_delete(&iface->proto_ip.route, &route->node);
1700
1701 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1702 if (pref->valid_until && pref->valid_until < now)
1703 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1704
1705 }
1706
1707 uloop_timeout_set(t, 1000);
1708 }
1709
1710 static void __init
1711 interface_ip_init_worker(void)
1712 {
1713 valid_until_timeout.cb = interface_ip_valid_until_handler;
1714 uloop_timeout_set(&valid_until_timeout, 1000);
1715 }
OpenWrt Network interface configuration daemon