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