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system-linux: improve handling of device rename
[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 <libgen.h>
19 #include <sys/stat.h>
20
21 #include <limits.h>
22 #include <arpa/inet.h>
23 #include <netinet/in.h>
24
25 #ifdef linux
26 #include <netinet/ether.h>
27 #else
28 #include <net/ethernet.h>
29 #endif
30
31 #include "netifd.h"
32 #include "device.h"
33 #include "interface.h"
34 #include "interface-ip.h"
35 #include "proto.h"
36 #include "ubus.h"
37 #include "system.h"
38
39 enum {
40 ROUTE_INTERFACE,
41 ROUTE_TARGET,
42 ROUTE_MASK,
43 ROUTE_GATEWAY,
44 ROUTE_METRIC,
45 ROUTE_MTU,
46 ROUTE_VALID,
47 ROUTE_TABLE,
48 ROUTE_SOURCE,
49 ROUTE_ONLINK,
50 ROUTE_TYPE,
51 ROUTE_PROTO,
52 __ROUTE_MAX
53 };
54
55 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
56 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
57 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
58 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
59 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
60 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
61 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
62 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
63 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
64 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
65 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
66 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
67 [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
68 };
69
70 const struct uci_blob_param_list route_attr_list = {
71 .n_params = __ROUTE_MAX,
72 .params = route_attr,
73 };
74
75 enum {
76 NEIGHBOR_INTERFACE,
77 NEIGHBOR_ADDRESS,
78 NEIGHBOR_MAC,
79 NEIGHBOR_PROXY,
80 NEIGHBOR_ROUTER,
81 __NEIGHBOR_MAX
82 };
83
84 static const struct blobmsg_policy neighbor_attr[__NEIGHBOR_MAX]={
85 [NEIGHBOR_INTERFACE]= { .name = "interface", .type = BLOBMSG_TYPE_STRING},
86 [NEIGHBOR_ADDRESS]= { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING},
87 [NEIGHBOR_MAC]= { .name = "mac", .type = BLOBMSG_TYPE_STRING},
88 [NEIGHBOR_PROXY]= { .name = "proxy", .type = BLOBMSG_TYPE_BOOL},
89 [NEIGHBOR_ROUTER]= {.name = "router", .type = BLOBMSG_TYPE_BOOL},
90 };
91
92 const struct uci_blob_param_list neighbor_attr_list = {
93 .n_params = __NEIGHBOR_MAX,
94 .params = neighbor_attr,
95 };
96
97
98 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
99 static struct device_prefix *ula_prefix = NULL;
100 static struct uloop_timeout valid_until_timeout;
101
102
103 static void
104 clear_if_addr(union if_addr *a, int mask)
105 {
106 int m_bytes = (mask + 7) / 8;
107 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
108 uint8_t *p = (uint8_t *) a;
109
110 if (m_bytes < sizeof(*a))
111 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
112
113 p[m_bytes - 1] &= ~m_clear;
114 }
115
116 static bool
117 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
118 {
119 union if_addr *p1, *p2;
120
121 p1 = alloca(sizeof(*a1));
122 p2 = alloca(sizeof(*a2));
123
124 memcpy(p1, a1, sizeof(*a1));
125 clear_if_addr(p1, mask);
126 memcpy(p2, a2, sizeof(*a2));
127 clear_if_addr(p2, mask);
128
129 return !memcmp(p1, p2, sizeof(*p1));
130 }
131
132 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
133 const union if_addr *addr, uint8_t mask, unsigned int table,
134 struct interface *in_iface, const char *action, bool src)
135 {
136 struct iprule rule = {
137 .flags = IPRULE_PRIORITY,
138 .priority = priority
139 };
140
141 if (addr) {
142 if (src) {
143 rule.flags |= IPRULE_SRC;
144 rule.src_addr = *addr;
145 rule.src_mask = mask;
146 } else {
147 rule.flags |= IPRULE_DEST;
148 rule.dest_addr = *addr;
149 rule.dest_mask = mask;
150 }
151 }
152
153 if (table) {
154 rule.flags |= IPRULE_LOOKUP;
155 rule.lookup = table;
156
157 if (!rule.lookup)
158 return 0;
159 } else if (action) {
160 rule.flags |= IPRULE_ACTION;
161 system_resolve_iprule_action(action, &rule.action);
162 }
163
164 if (in_iface && in_iface->l3_dev.dev) {
165 rule.flags |= IPRULE_IN;
166 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
167 }
168
169 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
170
171 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
172 }
173
174 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
175 {
176 struct iprule rule = {
177 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
178 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
179 .lookup = (v6) ? iface->ip6table : iface->ip4table,
180 .in_dev = "lo"
181 };
182
183 if (!rule.lookup)
184 return 0;
185
186 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
187
188 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
189 }
190
191 static bool
192 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
193 {
194 struct device_addr *addr;
195
196 vlist_for_each_element(&ip->addr, addr, node) {
197 if (!addr->enabled)
198 continue;
199
200 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
201 continue;
202
203 if (((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
204 addr->point_to_point && a->in.s_addr == addr->point_to_point)
205 return true;
206
207 /* Handle offlink addresses correctly */
208 unsigned int mask = addr->mask;
209 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
210 (addr->flags & DEVADDR_OFFLINK))
211 mask = 128;
212
213 if (!match_if_addr(&addr->addr, a, mask))
214 continue;
215
216 return true;
217 }
218
219 return false;
220 }
221
222 static void
223 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
224 bool v6, struct device_route **res)
225 {
226 struct device_route *route;
227
228 vlist_for_each_element(&ip->route, route, node) {
229 if (!route->enabled)
230 continue;
231
232 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
233 continue;
234
235 if (!match_if_addr(&route->addr, a, route->mask))
236 continue;
237
238 if (route->flags & DEVROUTE_TABLE)
239 continue;
240
241 if (!*res || route->mask > (*res)->mask)
242 *res = route;
243 }
244 }
245
246 static bool
247 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
248 {
249 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
250 __find_ip_addr_target(&iface->config_ip, a, v6);
251 }
252
253 static void
254 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
255 bool v6, struct device_route **route)
256 {
257 __find_ip_route_target(&iface->proto_ip, a, v6, route);
258 __find_ip_route_target(&iface->config_ip, a, v6, route);
259 }
260
261 struct interface *
262 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
263 {
264 struct device_route *route, *r_next = NULL;
265 bool defaultroute_target = false;
266 union if_addr addr_zero;
267 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
268
269 memset(&addr_zero, 0, sizeof(addr_zero));
270 if (memcmp(&addr_zero, addr, addrsize) == 0)
271 defaultroute_target = true;
272
273 if (iface) {
274 /* look for locally addressable target first */
275 if (interface_ip_find_addr_target(iface, addr, v6))
276 return iface;
277
278 /* do not stop at the first route, let the lookup compare
279 * masks to find the best match */
280 interface_ip_find_route_target(iface, addr, v6, &r_next);
281 } else {
282 vlist_for_each_element(&interfaces, iface, node) {
283 /* look for locally addressable target first */
284 if (interface_ip_find_addr_target(iface, addr, v6))
285 return iface;
286
287 /* do not stop at the first route, let the lookup compare
288 * masks to find the best match */
289 interface_ip_find_route_target(iface, addr, v6, &r_next);
290 }
291 }
292
293 if (!r_next)
294 return NULL;
295
296 iface = r_next->iface;
297 if (defaultroute_target)
298 return iface;
299
300 route = calloc(1, sizeof(*route));
301 if (!route)
302 return NULL;
303
304 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
305 route->mask = v6 ? 128 : 32;
306 memcpy(&route->addr, addr, addrsize);
307 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
308 route->mtu = r_next->mtu;
309 route->metric = r_next->metric;
310 route->table = r_next->table;
311 route->iface = iface;
312 vlist_add(&iface->host_routes, &route->node, route);
313
314 return iface;
315 }
316
317 static void
318 interface_set_route_info(struct interface *iface, struct device_route *route)
319 {
320 bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
321
322 if (!iface)
323 return;
324
325 if (!(route->flags & DEVROUTE_METRIC))
326 route->metric = iface->metric;
327
328 if (!(route->flags & DEVROUTE_TABLE)) {
329 route->table = (v6) ? iface->ip6table : iface->ip4table;
330 if (route->table)
331 route->flags |= DEVROUTE_SRCTABLE;
332 }
333 }
334
335 void
336 interface_ip_add_neighbor(struct interface *iface, struct blob_attr *attr, bool v6)
337 {
338 struct interface_ip_settings *ip;
339 struct blob_attr *tb[__NEIGHBOR_MAX], *cur;
340 struct device_neighbor *neighbor;
341 int af = v6 ? AF_INET6: AF_INET;
342 struct ether_addr *ea;
343
344 blobmsg_parse(neighbor_attr, __NEIGHBOR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
345
346 if (!iface) {
347 if ((cur = tb[NEIGHBOR_INTERFACE]) == NULL)
348 return;
349
350 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
351
352 if (!iface)
353 return;
354
355 ip = &iface->config_ip;
356 } else
357 ip = &iface->proto_ip;
358
359 neighbor = calloc(1,sizeof(*neighbor));
360 if (!neighbor)
361 return;
362
363 neighbor->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
364
365 if ((cur = tb[NEIGHBOR_ADDRESS]) != NULL){
366 if (!inet_pton(af, blobmsg_data(cur), &neighbor->addr))
367 goto error;
368 } else
369 goto error;
370
371 if ((cur = tb[NEIGHBOR_MAC]) != NULL) {
372 neighbor->flags |= DEVNEIGH_MAC;
373 ea = ether_aton(blobmsg_data(cur));
374 if (!ea)
375 goto error;
376
377 memcpy(neighbor->macaddr, ea, 6);
378 }
379
380 if ((cur = tb[NEIGHBOR_PROXY]) != NULL)
381 neighbor->proxy = blobmsg_get_bool(cur);
382
383 if ((cur = tb[NEIGHBOR_ROUTER]) != NULL)
384 neighbor->router = blobmsg_get_bool(cur);
385
386 vlist_add(&ip->neighbor, &neighbor->node, neighbor);
387 return;
388
389 error:
390 free(neighbor);
391 }
392
393 void
394 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
395 {
396 struct interface_ip_settings *ip;
397 struct blob_attr *tb[__ROUTE_MAX], *cur;
398 struct device_route *route;
399 int af = v6 ? AF_INET6 : AF_INET;
400
401 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
402
403 if (!iface) {
404 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
405 return;
406
407 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
408 if (!iface)
409 return;
410
411 ip = &iface->config_ip;
412 } else {
413 ip = &iface->proto_ip;
414 }
415
416 route = calloc(1, sizeof(*route));
417 if (!route)
418 return;
419
420 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
421 route->mask = v6 ? 128 : 32;
422 if ((cur = tb[ROUTE_MASK]) != NULL) {
423 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
424 if (route->mask > (v6 ? 128 : 32))
425 goto error;
426 }
427
428 if ((cur = tb[ROUTE_TARGET]) != NULL) {
429 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
430 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
431 goto error;
432 }
433 }
434
435 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
436 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
437 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
438 goto error;
439 }
440 }
441
442 if ((cur = tb[ROUTE_METRIC]) != NULL) {
443 route->metric = blobmsg_get_u32(cur);
444 route->flags |= DEVROUTE_METRIC;
445 }
446
447 if ((cur = tb[ROUTE_MTU]) != NULL) {
448 route->mtu = blobmsg_get_u32(cur);
449 route->flags |= DEVROUTE_MTU;
450 }
451
452 /* Use source-based routing */
453 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
454 char *saveptr, *source = alloca(blobmsg_data_len(cur));
455 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
456
457 const char *addr = strtok_r(source, "/", &saveptr);
458 const char *mask = strtok_r(NULL, "/", &saveptr);
459
460 if (!addr || inet_pton(af, addr, &route->source) < 1) {
461 DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
462 goto error;
463 }
464
465 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
466 }
467
468 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
469 route->flags |= DEVROUTE_ONLINK;
470
471 if ((cur = tb[ROUTE_TABLE]) != NULL) {
472 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
473 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
474 goto error;
475 }
476
477 /* only set the table flag if not using the main (default) table */
478 if (system_is_default_rt_table(route->table))
479 route->table = 0;
480
481 if (route->table)
482 route->flags |= DEVROUTE_TABLE;
483 }
484
485 if ((cur = tb[ROUTE_VALID]) != NULL) {
486 int64_t valid = blobmsg_get_u32(cur);
487 int64_t valid_until = valid + (int64_t)system_get_rtime();
488 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) /* Catch overflow */
489 route->valid_until = valid_until;
490 }
491
492 if ((cur = tb[ROUTE_TYPE]) != NULL) {
493 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
494 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
495 goto error;
496 }
497 route->flags |= DEVROUTE_TYPE;
498 }
499
500 if ((cur = tb[ROUTE_PROTO]) != NULL) {
501 if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
502 DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
503 goto error;
504 }
505 route->flags |= DEVROUTE_PROTO;
506 }
507
508 interface_set_route_info(iface, route);
509 vlist_add(&ip->route, &route->node, route);
510 return;
511
512 error:
513 free(route);
514 }
515
516 static int
517 addr_cmp(const void *k1, const void *k2, void *ptr)
518 {
519 return memcmp(k1, k2, sizeof(struct device_addr) -
520 offsetof(struct device_addr, flags));
521 }
522
523 static int
524 neighbor_cmp(const void *k1, const void *k2, void *ptr)
525 {
526 const struct device_neighbor *n1 = k1, *n2 = k2;
527
528 return memcmp(&n1->addr, &n2->addr, sizeof(n2->addr));
529 }
530
531 static int
532 route_cmp(const void *k1, const void *k2, void *ptr)
533 {
534 const struct device_route *r1 = k1, *r2 = k2;
535
536 if (r1->mask != r2->mask)
537 return r2->mask - r1->mask;
538
539 if (r1->metric != r2->metric)
540 return r1->metric - r2->metric;
541
542 if (r1->flags != r2->flags)
543 return r2->flags - r1->flags;
544
545 if (r1->sourcemask != r2->sourcemask)
546 return r1->sourcemask - r2->sourcemask;
547
548 if (r1->table != r2->table)
549 return r1->table - r2->table;
550
551 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
552 if (maskcmp)
553 return maskcmp;
554
555 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
556 }
557
558 static int
559 prefix_cmp(const void *k1, const void *k2, void *ptr)
560 {
561 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
562 offsetof(struct device_prefix, addr));
563 }
564
565 static void
566 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
567 {
568 struct device *dev = iface->l3_dev.dev;
569 struct device_route *r = &addr->subnet;
570
571 if (addr->flags & DEVADDR_OFFLINK)
572 return;
573
574 if (!add) {
575 if (!addr->subnet.iface)
576 return;
577
578 system_del_route(dev, r);
579 memset(r, 0, sizeof(*r));
580 return;
581 }
582
583 r->iface = iface;
584 r->flags = addr->flags;
585 r->mask = addr->mask;
586 memcpy(&r->addr, &addr->addr, sizeof(r->addr));
587 clear_if_addr(&r->addr, r->mask);
588
589 if (!system_resolve_rt_proto("kernel", &r->proto))
590 return;
591
592 r->flags |= DEVROUTE_PROTO;
593 system_del_route(dev, r);
594
595 r->flags &= ~DEVROUTE_PROTO;
596 interface_set_route_info(iface, r);
597
598 system_add_route(dev, r);
599 }
600
601 static void
602 interface_add_addr_rules(struct device_addr *addr, bool enabled)
603 {
604 bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
605
606 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
607 (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
608 true);
609 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
610 &addr->addr, addr->mask, addr->policy_table, NULL,
611 NULL, false);
612 }
613
614 static void
615 interface_update_proto_addr(struct vlist_tree *tree,
616 struct vlist_node *node_new,
617 struct vlist_node *node_old)
618 {
619 struct interface_ip_settings *ip;
620 struct interface *iface;
621 struct device *dev;
622 struct device_addr *a_new = NULL, *a_old = NULL;
623 bool replace = false;
624 bool keep = false;
625 bool v6 = false;
626
627 ip = container_of(tree, struct interface_ip_settings, addr);
628 iface = ip->iface;
629 dev = iface->l3_dev.dev;
630
631 if (!node_new || !node_old)
632 iface->updated |= IUF_ADDRESS;
633
634 if (node_new) {
635 a_new = container_of(node_new, struct device_addr, node);
636
637 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
638 !a_new->broadcast) {
639
640 /* /31 and /32 addressing need 255.255.255.255
641 * as broadcast address. */
642 if (a_new->mask >= 31) {
643 a_new->broadcast = (uint32_t) ~0;
644 } else {
645 uint32_t mask = ~0;
646 uint32_t *a = (uint32_t *) &a_new->addr;
647
648 mask >>= a_new->mask;
649 a_new->broadcast = *a | htonl(mask);
650 }
651 }
652 }
653
654 if (node_old)
655 a_old = container_of(node_old, struct device_addr, node);
656
657 if (a_new && a_old) {
658 keep = true;
659
660 if (a_old->flags != a_new->flags || a_old->failed)
661 keep = false;
662
663 if (a_old->valid_until != a_new->valid_until ||
664 a_old->preferred_until != a_new->preferred_until)
665 replace = true;
666
667 if (((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
668 (a_new->broadcast != a_old->broadcast ||
669 a_new->point_to_point != a_old->point_to_point))
670 keep = false;
671 }
672
673 if (node_old) {
674 if (a_old->enabled && !keep) {
675 /*
676 * This is needed for source routing to work correctly. If a device
677 * has two connections to a network using the same subnet, adding
678 * only the network-rule will cause packets to be routed through the
679 * first matching network (source IP matches both masks)
680 */
681 if (a_old->policy_table)
682 interface_add_addr_rules(a_old, false);
683
684 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
685 interface_handle_subnet_route(iface, a_old, false);
686 system_del_address(dev, a_old);
687 }
688 }
689 free(a_old->pclass);
690 free(a_old);
691 }
692
693 if (node_new) {
694 a_new->enabled = true;
695
696 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
697 v6 = true;
698
699 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
700
701 if (!keep || replace) {
702 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
703 if (system_add_address(dev, a_new))
704 a_new->failed = true;
705
706 if (iface->metric || a_new->policy_table)
707 interface_handle_subnet_route(iface, a_new, true);
708 }
709
710 if (!keep) {
711 if (a_new->policy_table)
712 interface_add_addr_rules(a_new, true);
713 }
714 }
715 }
716 }
717
718 static bool
719 enable_route(struct interface_ip_settings *ip, struct device_route *route)
720 {
721 if (ip->no_defaultroute && !route->mask)
722 return false;
723
724 return ip->enabled;
725 }
726
727 static void
728 interface_update_proto_neighbor(struct vlist_tree *tree,
729 struct vlist_node * node_new,
730 struct vlist_node *node_old)
731 {
732 struct device *dev;
733 struct device_neighbor *neighbor_old, *neighbor_new;
734 struct interface_ip_settings *ip;
735 bool keep = false;
736
737 ip = container_of(tree, struct interface_ip_settings, neighbor);
738 dev = ip->iface->l3_dev.dev;
739
740 neighbor_old = container_of(node_old, struct device_neighbor, node);
741 neighbor_new = container_of(node_new, struct device_neighbor, node);
742
743 if (node_old && node_new) {
744 keep = (!memcmp(neighbor_old->macaddr, neighbor_new->macaddr, sizeof(neighbor_old->macaddr)) &&
745 (neighbor_old->proxy == neighbor_new->proxy) &&
746 (neighbor_old->router == neighbor_new->router));
747 }
748
749 if (node_old) {
750 if (!keep && neighbor_old->enabled)
751 system_del_neighbor(dev, neighbor_old);
752
753 free(neighbor_old);
754 }
755
756 if (node_new) {
757 if (!keep && ip->enabled)
758 if (system_add_neighbor(dev, neighbor_new))
759 neighbor_new->failed = true;
760
761 neighbor_new->enabled = ip->enabled;
762 }
763 }
764
765 static void
766 interface_update_proto_route(struct vlist_tree *tree,
767 struct vlist_node *node_new,
768 struct vlist_node *node_old)
769 {
770 struct interface_ip_settings *ip;
771 struct interface *iface;
772 struct device *dev;
773 struct device_route *route_old, *route_new;
774 bool keep = false;
775
776 ip = container_of(tree, struct interface_ip_settings, route);
777 iface = ip->iface;
778 dev = iface->l3_dev.dev;
779
780 if (!node_new || !node_old)
781 iface->updated |= IUF_ROUTE;
782
783 route_old = container_of(node_old, struct device_route, node);
784 route_new = container_of(node_new, struct device_route, node);
785
786 if (node_old && node_new)
787 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
788 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
789 (route_old->proto == route_new->proto) && !route_old->failed;
790
791 if (node_old) {
792 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
793 system_del_route(dev, route_old);
794
795 free(route_old);
796 }
797
798 if (node_new) {
799 bool _enabled = enable_route(ip, route_new);
800
801 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
802 if (system_add_route(dev, route_new))
803 route_new->failed = true;
804
805 route_new->iface = iface;
806 route_new->enabled = _enabled;
807 }
808 }
809
810 static void
811 interface_update_host_route(struct vlist_tree *tree,
812 struct vlist_node *node_new,
813 struct vlist_node *node_old)
814 {
815 struct interface *iface;
816 struct device *dev;
817 struct device_route *route_old, *route_new;
818
819 iface = container_of(tree, struct interface, host_routes);
820 dev = iface->l3_dev.dev;
821
822 route_old = container_of(node_old, struct device_route, node);
823 route_new = container_of(node_new, struct device_route, node);
824
825 if (node_old) {
826 system_del_route(dev, route_old);
827 free(route_old);
828 }
829
830 if (node_new) {
831 if (system_add_route(dev, route_new))
832 route_new->failed = true;
833 }
834 }
835
836 static void
837 random_ifaceid(struct in6_addr *addr)
838 {
839 static bool initialized = false;
840 struct timeval t;
841
842 if (!initialized) {
843 long int seed = 0;
844 gettimeofday(&t, NULL);
845 seed = t.tv_sec ^ t.tv_usec ^ getpid();
846 srand48(seed);
847 initialized = true;
848 }
849 addr->s6_addr32[2] = (uint32_t)mrand48();
850 addr->s6_addr32[3] = (uint32_t)mrand48();
851 }
852
853 static bool
854 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
855 {
856 struct device_settings st;
857
858 device_merge_settings(iface->l3_dev.dev, &st);
859
860 if (!(st.flags & DEV_OPT_MACADDR))
861 return false;
862
863 /* get mac address */
864 uint8_t *ifaceid = addr->s6_addr + 8;
865 memcpy(ifaceid, st.macaddr, 3);
866 memcpy(ifaceid + 5, st.macaddr + 3, 3);
867 ifaceid[3] = 0xff;
868 ifaceid[4] = 0xfe;
869 ifaceid[0] ^= 0x02;
870
871 return true;
872 }
873
874 static bool
875 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
876 {
877 bool ret = true;
878
879 /* generate new iface id */
880 switch (iface->assignment_iface_id_selection) {
881 case IFID_FIXED:
882 /* fixed */
883 /* copy host part from assignment_fixed_iface_id */
884 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
885 break;
886 case IFID_RANDOM:
887 /* randomize last 64 bits */
888 random_ifaceid(addr);
889 break;
890 case IFID_EUI64:
891 /* eui64 */
892 ret = eui64_ifaceid(iface, addr);
893 break;
894 default:
895 ret = false;
896 break;
897 }
898 return ret;
899 }
900
901 static void
902 interface_set_prefix_address(struct device_prefix_assignment *assignment,
903 const struct device_prefix *prefix, struct interface *iface, bool add)
904 {
905 const struct interface *uplink = prefix->iface;
906 if (!iface->l3_dev.dev)
907 return;
908
909 struct device *l3_downlink = iface->l3_dev.dev;
910
911 struct device_addr addr;
912 struct device_route route;
913 memset(&addr, 0, sizeof(addr));
914 memset(&route, 0, sizeof(route));
915
916 addr.addr.in6 = assignment->addr;
917 addr.mask = assignment->length;
918 addr.flags = DEVADDR_INET6;
919 addr.preferred_until = prefix->preferred_until;
920 addr.valid_until = prefix->valid_until;
921
922 route.flags = DEVADDR_INET6;
923 route.mask = addr.mask < 64 ? 64 : addr.mask;
924 route.addr = addr.addr;
925
926 if (!add && assignment->enabled) {
927 time_t now = system_get_rtime();
928
929 addr.preferred_until = now;
930 if (!addr.valid_until || addr.valid_until - now > 7200)
931 addr.valid_until = now + 7200;
932
933 if (iface->ip6table)
934 set_ip_source_policy(false, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
935 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
936
937 if (prefix->iface) {
938 if (prefix->iface->ip6table)
939 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
940 addr.mask, prefix->iface->ip6table, iface, NULL, true);
941
942 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
943 addr.mask, 0, iface, "unreachable", true);
944 }
945
946 clear_if_addr(&route.addr, route.mask);
947 interface_set_route_info(iface, &route);
948
949 system_del_route(l3_downlink, &route);
950 system_add_address(l3_downlink, &addr);
951
952 assignment->addr = in6addr_any;
953 assignment->enabled = false;
954 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
955 if (IN6_IS_ADDR_UNSPECIFIED(&addr.addr.in6)) {
956 addr.addr.in6 = prefix->addr;
957 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
958 if (!generate_ifaceid(iface, &addr.addr.in6))
959 return;
960
961 assignment->addr = addr.addr.in6;
962 route.addr = addr.addr;
963 }
964
965 addr.flags |= DEVADDR_OFFLINK;
966 if (system_add_address(l3_downlink, &addr))
967 return;
968
969 if (!assignment->enabled) {
970 if (iface->ip6table)
971 set_ip_source_policy(true, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
972 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
973
974 if (prefix->iface) {
975 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
976 addr.mask, 0, iface, "unreachable", true);
977
978 if (prefix->iface->ip6table)
979 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
980 addr.mask, prefix->iface->ip6table, iface, NULL, true);
981 }
982 }
983
984 clear_if_addr(&route.addr, route.mask);
985 interface_set_route_info(iface, &route);
986
987 system_add_route(l3_downlink, &route);
988
989 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
990 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
991 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
992
993 if (mtu > 0 && mtu_old != mtu) {
994 if (system_update_ipv6_mtu(l3_downlink, mtu) < 0 && mtu < mtu_old)
995 netifd_log_message(L_WARNING, "Failed to set IPv6 mtu to %d "
996 "on interface '%s'\n", mtu, iface->name);
997 }
998 }
999
1000 assignment->enabled = true;
1001 }
1002 }
1003
1004 static bool interface_prefix_assign(struct list_head *list,
1005 struct device_prefix_assignment *assign)
1006 {
1007 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
1008 struct device_prefix_assignment *c;
1009 list_for_each_entry(c, list, head) {
1010 if (assign->assigned != -1) {
1011 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
1012 list_add_tail(&assign->head, &c->head);
1013 return true;
1014 }
1015 } else if (assign->assigned == -1) {
1016 current = (current + asize) & (~asize);
1017 if (current + asize < c->assigned) {
1018 assign->assigned = current;
1019 list_add_tail(&assign->head, &c->head);
1020 return true;
1021 }
1022 }
1023 current = (c->assigned + (1 << (64 - c->length)));
1024 }
1025 return false;
1026 }
1027
1028 /*
1029 * Sorting of assignment entries:
1030 * Primary on assignment length: smallest assignment first
1031 * Secondary on assignment weight: highest weight first
1032 * Finally alphabetical order of interface names
1033 */
1034 static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
1035 {
1036 const struct device_prefix_assignment *a1 = k1, *a2 = k2;
1037
1038 if (a1->length != a2->length)
1039 return a1->length - a2->length;
1040
1041 if (a1->weight != a2->weight)
1042 return a2->weight - a1->weight;
1043
1044 return strcmp(a1->name, a2->name);
1045 }
1046
1047 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
1048 {
1049 struct device_prefix_assignment *c;
1050 struct interface *iface;
1051
1052 /* Delete all assignments */
1053 while (!list_empty(&prefix->assignments)) {
1054 c = list_first_entry(&prefix->assignments,
1055 struct device_prefix_assignment, head);
1056 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1057 interface_set_prefix_address(c, prefix, iface, false);
1058 list_del(&c->head);
1059 free(c);
1060 }
1061
1062 if (!setup)
1063 return;
1064
1065 /* End-of-assignment sentinel */
1066 c = malloc(sizeof(*c) + 1);
1067 if (!c)
1068 return;
1069
1070 c->assigned = 1 << (64 - prefix->length);
1071 c->length = 64;
1072 c->name[0] = 0;
1073 c->addr = in6addr_any;
1074 list_add(&c->head, &prefix->assignments);
1075
1076 /* Excluded prefix */
1077 if (prefix->excl_length > 0) {
1078 const char name[] = "!excluded";
1079 c = malloc(sizeof(*c) + sizeof(name));
1080 if (c) {
1081 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
1082 ((1 << (64 - prefix->length)) - 1);
1083 c->length = prefix->excl_length;
1084 c->addr = in6addr_any;
1085 memcpy(c->name, name, sizeof(name));
1086 list_add(&c->head, &prefix->assignments);
1087 }
1088 }
1089
1090 bool assigned_any = false;
1091 struct {
1092 struct avl_node node;
1093 } *entry, *n_entry;
1094 struct avl_tree assign_later;
1095
1096 avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
1097
1098 vlist_for_each_element(&interfaces, iface, node) {
1099 if (iface->assignment_length < 48 ||
1100 iface->assignment_length > 64)
1101 continue;
1102
1103 /* Test whether there is a matching class */
1104 if (!list_empty(&iface->assignment_classes)) {
1105 bool found = false;
1106
1107 struct interface_assignment_class *c;
1108 list_for_each_entry(c, &iface->assignment_classes, head) {
1109 if (!strcmp(c->name, prefix->pclass)) {
1110 found = true;
1111 break;
1112 }
1113 }
1114
1115 if (!found)
1116 continue;
1117 }
1118
1119 size_t namelen = strlen(iface->name) + 1;
1120 c = malloc(sizeof(*c) + namelen);
1121 if (!c)
1122 continue;
1123
1124 c->length = iface->assignment_length;
1125 c->assigned = iface->assignment_hint;
1126 c->weight = iface->assignment_weight;
1127 c->addr = in6addr_any;
1128 c->enabled = false;
1129 memcpy(c->name, iface->name, namelen);
1130
1131 /* First process all custom assignments, put all others in later-list */
1132 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
1133 if (c->assigned != -1) {
1134 c->assigned = -1;
1135 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
1136 "of size %hhu for %s, trying other\n", c->length, c->name);
1137 }
1138
1139 entry = calloc(1, sizeof(*entry));
1140 if (!entry) {
1141 free(c);
1142 continue;
1143 }
1144
1145 entry->node.key = c;
1146 avl_insert(&assign_later, &entry->node);
1147 }
1148
1149 if (c->assigned != -1)
1150 assigned_any = true;
1151 }
1152
1153 /* Then try to assign all other + failed custom assignments */
1154 avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
1155 bool assigned = false;
1156
1157 c = (struct device_prefix_assignment *)entry->node.key;
1158 avl_delete(&assign_later, &entry->node);
1159
1160 do {
1161 assigned = interface_prefix_assign(&prefix->assignments, c);
1162 } while (!assigned && ++c->length <= 64);
1163
1164 if (!assigned) {
1165 netifd_log_message(L_WARNING, "Failed to assign subprefix "
1166 "of size %hhu for %s\n", c->length, c->name);
1167 free(c);
1168 } else
1169 assigned_any = true;
1170
1171 free(entry);
1172 }
1173
1174 list_for_each_entry(c, &prefix->assignments, head)
1175 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1176 interface_set_prefix_address(c, prefix, iface, true);
1177
1178 if (!assigned_any)
1179 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
1180 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
1181 }
1182
1183
1184 void interface_refresh_assignments(bool hint)
1185 {
1186 static bool refresh = false;
1187 if (!hint && refresh) {
1188 struct device_prefix *p;
1189 list_for_each_entry(p, &prefixes, head)
1190 interface_update_prefix_assignments(p, true);
1191 }
1192 refresh = hint;
1193 }
1194
1195 void interface_update_prefix_delegation(struct interface_ip_settings *ip)
1196 {
1197 struct device_prefix *prefix;
1198
1199 vlist_for_each_element(&ip->prefix, prefix, node) {
1200 interface_update_prefix_assignments(prefix, !ip->no_delegation);
1201
1202 if (ip->no_delegation) {
1203 if (prefix->head.next)
1204 list_del(&prefix->head);
1205 } else
1206 list_add(&prefix->head, &prefixes);
1207 }
1208 }
1209
1210 static void
1211 interface_update_prefix(struct vlist_tree *tree,
1212 struct vlist_node *node_new,
1213 struct vlist_node *node_old)
1214 {
1215 struct device_prefix *prefix_old, *prefix_new;
1216 prefix_old = container_of(node_old, struct device_prefix, node);
1217 prefix_new = container_of(node_new, struct device_prefix, node);
1218
1219 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
1220 if (tree && (!node_new || !node_old))
1221 ip->iface->updated |= IUF_PREFIX;
1222
1223 struct device_route route;
1224 memset(&route, 0, sizeof(route));
1225 route.flags = DEVADDR_INET6;
1226 route.metric = INT32_MAX;
1227 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
1228 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
1229
1230
1231 struct device_prefix_assignment *c;
1232 struct interface *iface;
1233
1234 if (node_old && node_new) {
1235 /* Move assignments and refresh addresses to update valid times */
1236 list_splice(&prefix_old->assignments, &prefix_new->assignments);
1237
1238 list_for_each_entry(c, &prefix_new->assignments, head)
1239 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1240 interface_set_prefix_address(c, prefix_new, iface, true);
1241
1242 if (prefix_new->preferred_until != prefix_old->preferred_until ||
1243 prefix_new->valid_until != prefix_old->valid_until)
1244 ip->iface->updated |= IUF_PREFIX;
1245 } else if (node_new) {
1246 /* Set null-route to avoid routing loops */
1247 system_add_route(NULL, &route);
1248
1249 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
1250 interface_update_prefix_assignments(prefix_new, true);
1251 } else if (node_old) {
1252 /* Remove null-route */
1253 interface_update_prefix_assignments(prefix_old, false);
1254 system_del_route(NULL, &route);
1255 }
1256
1257 if (node_old) {
1258 if (prefix_old->head.next)
1259 list_del(&prefix_old->head);
1260 free(prefix_old);
1261 }
1262
1263 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1264 list_add(&prefix_new->head, &prefixes);
1265
1266 }
1267
1268 struct device_prefix*
1269 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1270 uint8_t length, time_t valid_until, time_t preferred_until,
1271 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1272 {
1273 if (!pclass)
1274 pclass = (iface) ? iface->name : "local";
1275
1276 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1277 if (!prefix)
1278 return NULL;
1279
1280 prefix->length = length;
1281 prefix->addr = *addr;
1282 prefix->preferred_until = preferred_until;
1283 prefix->valid_until = valid_until;
1284 prefix->iface = iface;
1285 INIT_LIST_HEAD(&prefix->assignments);
1286
1287 if (excl_addr) {
1288 prefix->excl_addr = *excl_addr;
1289 prefix->excl_length = excl_length;
1290 }
1291
1292 strcpy(prefix->pclass, pclass);
1293
1294 if (iface)
1295 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1296 else
1297 interface_update_prefix(NULL, &prefix->node, NULL);
1298
1299 return prefix;
1300 }
1301
1302 void
1303 interface_ip_set_ula_prefix(const char *prefix)
1304 {
1305 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1306 if (prefix)
1307 strncpy(buf, prefix, sizeof(buf) - 1);
1308 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1309
1310 struct in6_addr addr;
1311 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1312 if (ula_prefix) {
1313 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1314 ula_prefix = NULL;
1315 }
1316 return;
1317 }
1318
1319 int length;
1320 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1321 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1322 return;
1323
1324 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1325 ula_prefix->length != length) {
1326 if (ula_prefix)
1327 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1328
1329 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1330 0, 0, NULL, 0, NULL);
1331 }
1332 }
1333
1334 static void
1335 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1336 {
1337 struct dns_server *s;
1338
1339 s = calloc(1, sizeof(*s));
1340 if (!s)
1341 return;
1342
1343 s->af = AF_INET;
1344 if (inet_pton(s->af, str, &s->addr.in))
1345 goto add;
1346
1347 s->af = AF_INET6;
1348 if (inet_pton(s->af, str, &s->addr.in))
1349 goto add;
1350
1351 free(s);
1352 return;
1353
1354 add:
1355 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1356 s->af == AF_INET6 ? '6' : '4', str);
1357 vlist_simple_add(&ip->dns_servers, &s->node);
1358 }
1359
1360 void
1361 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1362 {
1363 struct blob_attr *cur;
1364 int rem;
1365
1366 blobmsg_for_each_attr(cur, list, rem) {
1367 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1368 continue;
1369
1370 if (!blobmsg_check_attr(cur, false))
1371 continue;
1372
1373 interface_add_dns_server(ip, blobmsg_data(cur));
1374 }
1375 }
1376
1377 static void
1378 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1379 {
1380 struct dns_search_domain *s;
1381 int len = strlen(str);
1382
1383 s = calloc(1, sizeof(*s) + len + 1);
1384 if (!s)
1385 return;
1386
1387 D(INTERFACE, "Add DNS search domain: %s\n", str);
1388 memcpy(s->name, str, len);
1389 vlist_simple_add(&ip->dns_search, &s->node);
1390 }
1391
1392 void
1393 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1394 {
1395 struct blob_attr *cur;
1396 int rem;
1397
1398 blobmsg_for_each_attr(cur, list, rem) {
1399 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1400 continue;
1401
1402 if (!blobmsg_check_attr(cur, false))
1403 continue;
1404
1405 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1406 }
1407 }
1408
1409 static void
1410 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1411 {
1412 struct dns_server *s;
1413 struct dns_search_domain *d;
1414 const char *str;
1415 char buf[INET6_ADDRSTRLEN];
1416
1417 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1418 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1419 if (!str)
1420 continue;
1421
1422 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1423 fprintf(f, "nameserver %s%%%s\n", str, dev);
1424 else
1425 fprintf(f, "nameserver %s\n", str);
1426 }
1427
1428 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1429 fprintf(f, "search %s\n", d->name);
1430 }
1431 }
1432
1433 /* Sorting of interface resolver entries : */
1434 /* Primary on interface dns_metric : lowest metric first */
1435 /* Secondary on interface metric : lowest metric first */
1436 /* Finally alphabetical order of interface names */
1437 static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
1438 {
1439 const struct interface *iface1 = k1, *iface2 = k2;
1440
1441 if (iface1->dns_metric != iface2->dns_metric)
1442 return iface1->dns_metric - iface2->dns_metric;
1443
1444 if (iface1->metric != iface2->metric)
1445 return iface1->metric - iface2->metric;
1446
1447 return strcmp(iface1->name, iface2->name);
1448 }
1449
1450 static void
1451 __interface_write_dns_entries(FILE *f, const char *jail)
1452 {
1453 struct interface *iface;
1454 struct {
1455 struct avl_node node;
1456 } *entry, *n_entry;
1457 struct avl_tree resolv_conf_iface_entries;
1458
1459 avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
1460
1461 vlist_for_each_element(&interfaces, iface, node) {
1462 if (iface->state != IFS_UP)
1463 continue;
1464
1465 if (jail && (!iface->jail || strcmp(jail, iface->jail)))
1466 continue;
1467
1468 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1469 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1470 vlist_simple_empty(&iface->config_ip.dns_search) &&
1471 vlist_simple_empty(&iface->config_ip.dns_servers))
1472 continue;
1473
1474 entry = calloc(1, sizeof(*entry));
1475 if (!entry)
1476 continue;
1477
1478 entry->node.key = iface;
1479 avl_insert(&resolv_conf_iface_entries, &entry->node);
1480 }
1481
1482 avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
1483 iface = (struct interface *)entry->node.key;
1484 struct device *dev = iface->l3_dev.dev;
1485
1486 fprintf(f, "# Interface %s\n", iface->name);
1487
1488 write_resolv_conf_entries(f, &iface->config_ip, dev->ifname);
1489
1490 if (!iface->proto_ip.no_dns)
1491 write_resolv_conf_entries(f, &iface->proto_ip, dev->ifname);
1492 }
1493
1494 avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
1495 free(entry);
1496 }
1497
1498 void
1499 interface_write_resolv_conf(const char *jail)
1500 {
1501 size_t plen = (jail ? strlen(jail) + 1 : 0 ) + strlen(resolv_conf) + 1;
1502 char *path = alloca(plen);
1503 char *dpath = alloca(plen);
1504 char *tmppath = alloca(plen + 4);
1505 FILE *f;
1506 uint32_t crcold, crcnew;
1507
1508 if (jail) {
1509 sprintf(path, "/tmp/resolv.conf-%s.d/resolv.conf.auto", jail);
1510 strcpy(dpath, path);
1511 dpath = dirname(dpath);
1512 mkdir(dpath, 0755);
1513 } else {
1514 strcpy(path, resolv_conf);
1515 }
1516
1517 sprintf(tmppath, "%s.tmp", path);
1518 unlink(tmppath);
1519 f = fopen(tmppath, "w+");
1520 if (!f) {
1521 D(INTERFACE, "Failed to open %s for writing\n", path);
1522 return;
1523 }
1524
1525 __interface_write_dns_entries(f, jail);
1526
1527 fflush(f);
1528 rewind(f);
1529 crcnew = crc32_file(f);
1530 fclose(f);
1531
1532 crcold = crcnew + 1;
1533 f = fopen(path, "r");
1534 if (f) {
1535 crcold = crc32_file(f);
1536 fclose(f);
1537 }
1538
1539 if (crcold == crcnew) {
1540 unlink(tmppath);
1541 } else if (rename(tmppath, path) < 0) {
1542 D(INTERFACE, "Failed to replace %s\n", path);
1543 unlink(tmppath);
1544 }
1545 }
1546
1547 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1548 {
1549 struct device_addr *addr;
1550 struct device_route *route;
1551 struct device_neighbor *neighbor;
1552 struct device *dev;
1553 struct interface *iface;
1554
1555 ip->enabled = enabled;
1556 iface = ip->iface;
1557 dev = iface->l3_dev.dev;
1558 if (!dev)
1559 return;
1560
1561 vlist_for_each_element(&ip->addr, addr, node) {
1562 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1563
1564 if (addr->flags & DEVADDR_EXTERNAL)
1565 continue;
1566
1567 if (addr->enabled == enabled)
1568 continue;
1569
1570 if (enabled) {
1571 system_add_address(dev, addr);
1572
1573 addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1574 if (iface->metric || addr->policy_table)
1575 interface_handle_subnet_route(iface, addr, true);
1576
1577 if (addr->policy_table)
1578 interface_add_addr_rules(addr, true);
1579 } else {
1580 interface_handle_subnet_route(iface, addr, false);
1581 system_del_address(dev, addr);
1582
1583 if (addr->policy_table)
1584 interface_add_addr_rules(addr, false);
1585 }
1586 addr->enabled = enabled;
1587 }
1588
1589 vlist_for_each_element(&ip->route, route, node) {
1590 bool _enabled = enabled;
1591
1592 if (route->flags & DEVADDR_EXTERNAL)
1593 continue;
1594
1595 if (!enable_route(ip, route))
1596 _enabled = false;
1597 if (route->enabled == _enabled)
1598 continue;
1599
1600 if (_enabled) {
1601 interface_set_route_info(ip->iface, route);
1602
1603 if (system_add_route(dev, route))
1604 route->failed = true;
1605 } else
1606 system_del_route(dev, route);
1607 route->enabled = _enabled;
1608 }
1609
1610 vlist_for_each_element(&ip->neighbor, neighbor, node) {
1611 if (neighbor->enabled == enabled)
1612 continue;
1613
1614 if (enabled) {
1615 if(system_add_neighbor(dev, neighbor))
1616 neighbor->failed = true;
1617 } else
1618 system_del_neighbor(dev, neighbor);
1619
1620 neighbor->enabled = enabled;
1621 }
1622
1623 struct device_prefix *c;
1624 struct device_prefix_assignment *a;
1625 list_for_each_entry(c, &prefixes, head)
1626 list_for_each_entry(a, &c->assignments, head)
1627 if (!strcmp(a->name, ip->iface->name))
1628 interface_set_prefix_address(a, c, ip->iface, enabled);
1629
1630 if (ip->iface->policy_rules_set != enabled &&
1631 ip->iface->l3_dev.dev) {
1632 set_ip_lo_policy(enabled, true, ip->iface);
1633 set_ip_lo_policy(enabled, false, ip->iface);
1634
1635 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1636 NULL, 0, 0, ip->iface, "failed_policy", true);
1637 ip->iface->policy_rules_set = enabled;
1638 }
1639 }
1640
1641 void
1642 interface_ip_update_start(struct interface_ip_settings *ip)
1643 {
1644 if (ip != &ip->iface->config_ip) {
1645 vlist_simple_update(&ip->dns_servers);
1646 vlist_simple_update(&ip->dns_search);
1647 }
1648 vlist_update(&ip->route);
1649 vlist_update(&ip->addr);
1650 vlist_update(&ip->prefix);
1651 vlist_update(&ip->neighbor);
1652 }
1653
1654 void
1655 interface_ip_update_complete(struct interface_ip_settings *ip)
1656 {
1657 vlist_simple_flush(&ip->dns_servers);
1658 vlist_simple_flush(&ip->dns_search);
1659 vlist_flush(&ip->route);
1660 vlist_flush(&ip->addr);
1661 vlist_flush(&ip->prefix);
1662 vlist_flush(&ip->neighbor);
1663 interface_write_resolv_conf(ip->iface->jail);
1664 }
1665
1666 void
1667 interface_ip_flush(struct interface_ip_settings *ip)
1668 {
1669 if (ip == &ip->iface->proto_ip)
1670 vlist_flush_all(&ip->iface->host_routes);
1671 vlist_simple_flush_all(&ip->dns_servers);
1672 vlist_simple_flush_all(&ip->dns_search);
1673 vlist_flush_all(&ip->route);
1674 vlist_flush_all(&ip->addr);
1675 vlist_flush_all(&ip->neighbor);
1676 vlist_flush_all(&ip->prefix);
1677 }
1678
1679 static void
1680 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1681 {
1682 ip->iface = iface;
1683 ip->enabled = true;
1684 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1685 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1686 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1687 vlist_init(&ip->neighbor, neighbor_cmp, interface_update_proto_neighbor);
1688 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1689 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1690 }
1691
1692 void
1693 interface_ip_init(struct interface *iface)
1694 {
1695 __interface_ip_init(&iface->proto_ip, iface);
1696 __interface_ip_init(&iface->config_ip, iface);
1697 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1698 }
1699
1700 static void
1701 interface_ip_valid_until_handler(struct uloop_timeout *t)
1702 {
1703 time_t now = system_get_rtime();
1704 struct interface *iface;
1705 vlist_for_each_element(&interfaces, iface, node) {
1706 if (iface->state != IFS_UP)
1707 continue;
1708
1709 struct device_addr *addr, *addrp;
1710 struct device_route *route, *routep;
1711 struct device_prefix *pref, *prefp;
1712
1713 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1714 if (addr->valid_until && addr->valid_until < now)
1715 vlist_delete(&iface->proto_ip.addr, &addr->node);
1716
1717 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1718 if (route->valid_until && route->valid_until < now)
1719 vlist_delete(&iface->proto_ip.route, &route->node);
1720
1721 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1722 if (pref->valid_until && pref->valid_until < now)
1723 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1724
1725 }
1726
1727 uloop_timeout_set(t, 1000);
1728 }
1729
1730 static void __init
1731 interface_ip_init_worker(void)
1732 {
1733 valid_until_timeout.cb = interface_ip_valid_until_handler;
1734 uloop_timeout_set(&valid_until_timeout, 1000);
1735 }
OpenWrt Network interface configuration daemon