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CMake: bump the minimum required CMake version to 3.5
[project/netifd.git] / interface-ip.c
1 /*
2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2012 Steven Barth <steven@midlink.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15 #include <string.h>
16 #include <stdlib.h>
17 #include <stdio.h>
18
19 #include <limits.h>
20 #include <arpa/inet.h>
21 #include <netinet/in.h>
22
23 #ifdef linux
24 #include <netinet/ether.h>
25 #endif
26
27 #include "netifd.h"
28 #include "device.h"
29 #include "interface.h"
30 #include "interface-ip.h"
31 #include "proto.h"
32 #include "ubus.h"
33 #include "system.h"
34
35 enum {
36 ROUTE_INTERFACE,
37 ROUTE_TARGET,
38 ROUTE_MASK,
39 ROUTE_GATEWAY,
40 ROUTE_METRIC,
41 ROUTE_MTU,
42 ROUTE_VALID,
43 ROUTE_TABLE,
44 ROUTE_SOURCE,
45 ROUTE_ONLINK,
46 ROUTE_TYPE,
47 ROUTE_PROTO,
48 __ROUTE_MAX
49 };
50
51 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
52 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
53 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
54 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
55 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
56 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
57 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
58 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
59 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
60 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
61 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
62 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
63 [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
64 };
65
66 const struct uci_blob_param_list route_attr_list = {
67 .n_params = __ROUTE_MAX,
68 .params = route_attr,
69 };
70
71 enum {
72 NEIGHBOR_INTERFACE,
73 NEIGHBOR_ADDRESS,
74 NEIGHBOR_MAC,
75 NEIGHBOR_PROXY,
76 NEIGHBOR_ROUTER,
77 __NEIGHBOR_MAX
78 };
79
80 static const struct blobmsg_policy neighbor_attr[__NEIGHBOR_MAX]={
81 [NEIGHBOR_INTERFACE]= { .name = "interface", .type = BLOBMSG_TYPE_STRING},
82 [NEIGHBOR_ADDRESS]= { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING},
83 [NEIGHBOR_MAC]= { .name = "mac", .type = BLOBMSG_TYPE_STRING},
84 [NEIGHBOR_PROXY]= { .name = "proxy", .type = BLOBMSG_TYPE_BOOL},
85 [NEIGHBOR_ROUTER]= {.name = "router", .type = BLOBMSG_TYPE_BOOL},
86 };
87
88 const struct uci_blob_param_list neighbor_attr_list = {
89 .n_params = __NEIGHBOR_MAX,
90 .params = neighbor_attr,
91 };
92
93
94 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
95 static struct device_prefix *ula_prefix = NULL;
96 static struct uloop_timeout valid_until_timeout;
97
98
99 static void
100 clear_if_addr(union if_addr *a, int mask)
101 {
102 int m_bytes = (mask + 7) / 8;
103 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
104 uint8_t *p = (uint8_t *) a;
105
106 if (m_bytes < sizeof(*a))
107 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
108
109 p[m_bytes - 1] &= ~m_clear;
110 }
111
112 static bool
113 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
114 {
115 union if_addr *p1, *p2;
116
117 p1 = alloca(sizeof(*a1));
118 p2 = alloca(sizeof(*a2));
119
120 memcpy(p1, a1, sizeof(*a1));
121 clear_if_addr(p1, mask);
122 memcpy(p2, a2, sizeof(*a2));
123 clear_if_addr(p2, mask);
124
125 return !memcmp(p1, p2, sizeof(*p1));
126 }
127
128 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
129 const union if_addr *addr, uint8_t mask, unsigned int table,
130 struct interface *in_iface, const char *action, bool src)
131 {
132 struct iprule rule = {
133 .flags = IPRULE_PRIORITY,
134 .priority = priority
135 };
136
137 if (addr) {
138 if (src) {
139 rule.flags |= IPRULE_SRC;
140 rule.src_addr = *addr;
141 rule.src_mask = mask;
142 } else {
143 rule.flags |= IPRULE_DEST;
144 rule.dest_addr = *addr;
145 rule.dest_mask = mask;
146 }
147 }
148
149 if (table) {
150 rule.flags |= IPRULE_LOOKUP;
151 rule.lookup = table;
152
153 if (!rule.lookup)
154 return 0;
155 } else if (action) {
156 rule.flags |= IPRULE_ACTION;
157 system_resolve_iprule_action(action, &rule.action);
158 }
159
160 if (in_iface && in_iface->l3_dev.dev) {
161 rule.flags |= IPRULE_IN;
162 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
163 }
164
165 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
166
167 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
168 }
169
170 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
171 {
172 struct iprule rule = {
173 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
174 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
175 .lookup = (v6) ? iface->ip6table : iface->ip4table,
176 .in_dev = "lo"
177 };
178
179 if (!rule.lookup)
180 return 0;
181
182 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
183
184 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
185 }
186
187 static bool
188 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
189 {
190 struct device_addr *addr;
191
192 vlist_for_each_element(&ip->addr, addr, node) {
193 if (!addr->enabled)
194 continue;
195
196 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
197 continue;
198
199 /* Handle offlink addresses correctly */
200 unsigned int mask = addr->mask;
201 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
202 (addr->flags & DEVADDR_OFFLINK))
203 mask = 128;
204
205 if (!match_if_addr(&addr->addr, a, mask))
206 continue;
207
208 return true;
209 }
210
211 return false;
212 }
213
214 static void
215 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
216 bool v6, struct device_route **res)
217 {
218 struct device_route *route;
219
220 vlist_for_each_element(&ip->route, route, node) {
221 if (!route->enabled)
222 continue;
223
224 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
225 continue;
226
227 if (!match_if_addr(&route->addr, a, route->mask))
228 continue;
229
230 if (route->flags & DEVROUTE_TABLE)
231 continue;
232
233 if (!*res || route->mask > (*res)->mask)
234 *res = route;
235 }
236 }
237
238 static bool
239 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
240 {
241 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
242 __find_ip_addr_target(&iface->config_ip, a, v6);
243 }
244
245 static void
246 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
247 bool v6, struct device_route **route)
248 {
249 __find_ip_route_target(&iface->proto_ip, a, v6, route);
250 __find_ip_route_target(&iface->config_ip, a, v6, route);
251 }
252
253 struct interface *
254 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
255 {
256 struct device_route *route, *r_next = NULL;
257 bool defaultroute_target = false;
258 union if_addr addr_zero;
259 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
260
261 memset(&addr_zero, 0, sizeof(addr_zero));
262 if (memcmp(&addr_zero, addr, addrsize) == 0)
263 defaultroute_target = true;
264
265 if (iface) {
266 /* look for locally addressable target first */
267 if (interface_ip_find_addr_target(iface, addr, v6))
268 return iface;
269
270 /* do not stop at the first route, let the lookup compare
271 * masks to find the best match */
272 interface_ip_find_route_target(iface, addr, v6, &r_next);
273 } else {
274 vlist_for_each_element(&interfaces, iface, node) {
275 /* look for locally addressable target first */
276 if (interface_ip_find_addr_target(iface, addr, v6))
277 return iface;
278
279 /* do not stop at the first route, let the lookup compare
280 * masks to find the best match */
281 interface_ip_find_route_target(iface, addr, v6, &r_next);
282 }
283 }
284
285 if (!r_next)
286 return NULL;
287
288 iface = r_next->iface;
289 if (defaultroute_target)
290 return iface;
291
292 route = calloc(1, sizeof(*route));
293 if (!route)
294 return NULL;
295
296 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
297 route->mask = v6 ? 128 : 32;
298 memcpy(&route->addr, addr, addrsize);
299 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
300 route->mtu = r_next->mtu;
301 route->metric = r_next->metric;
302 route->table = r_next->table;
303 route->iface = iface;
304 vlist_add(&iface->host_routes, &route->node, route);
305
306 return iface;
307 }
308
309 static void
310 interface_set_route_info(struct interface *iface, struct device_route *route)
311 {
312 bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
313
314 if (!iface)
315 return;
316
317 if (!(route->flags & DEVROUTE_METRIC))
318 route->metric = iface->metric;
319
320 if (!(route->flags & DEVROUTE_TABLE)) {
321 route->table = (v6) ? iface->ip6table : iface->ip4table;
322 if (route->table)
323 route->flags |= DEVROUTE_SRCTABLE;
324 }
325 }
326
327 void
328 interface_ip_add_neighbor(struct interface *iface, struct blob_attr *attr, bool v6)
329 {
330 struct interface_ip_settings *ip;
331 struct blob_attr *tb[__NEIGHBOR_MAX], *cur;
332 struct device_neighbor *neighbor;
333 int af = v6 ? AF_INET6: AF_INET;
334 struct ether_addr *ea;
335
336 blobmsg_parse(neighbor_attr, __NEIGHBOR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
337
338 if (!iface) {
339 if ((cur = tb[NEIGHBOR_INTERFACE]) == NULL)
340 return;
341
342 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
343
344 if (!iface)
345 return;
346
347 ip = &iface->config_ip;
348 } else
349 ip = &iface->proto_ip;
350
351 neighbor = calloc(1,sizeof(*neighbor));
352 neighbor->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
353
354 if (!neighbor)
355 return;
356
357 if ((cur = tb[NEIGHBOR_ADDRESS]) != NULL){
358 if (!inet_pton(af, blobmsg_data(cur), &neighbor->addr))
359 goto error;
360 } else
361 goto error;
362
363 if ((cur = tb[NEIGHBOR_MAC]) != NULL) {
364 neighbor->flags |= DEVNEIGH_MAC;
365 ea = ether_aton(blobmsg_data(cur));
366 if (!ea)
367 goto error;
368
369 memcpy(neighbor->macaddr, ea, 6);
370 }
371
372 if ((cur = tb[NEIGHBOR_PROXY]) != NULL)
373 neighbor->proxy = blobmsg_get_bool(cur);
374
375 if ((cur = tb[NEIGHBOR_ROUTER]) != NULL)
376 neighbor->router = blobmsg_get_bool(cur);
377
378 vlist_add(&ip->neighbor, &neighbor->node, neighbor);
379 return;
380
381 error:
382 free(neighbor);
383 }
384
385 void
386 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
387 {
388 struct interface_ip_settings *ip;
389 struct blob_attr *tb[__ROUTE_MAX], *cur;
390 struct device_route *route;
391 int af = v6 ? AF_INET6 : AF_INET;
392
393 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
394
395 if (!iface) {
396 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
397 return;
398
399 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
400 if (!iface)
401 return;
402
403 ip = &iface->config_ip;
404 } else {
405 ip = &iface->proto_ip;
406 }
407
408 route = calloc(1, sizeof(*route));
409 if (!route)
410 return;
411
412 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
413 route->mask = v6 ? 128 : 32;
414 if ((cur = tb[ROUTE_MASK]) != NULL) {
415 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
416 if (route->mask > (v6 ? 128 : 32))
417 goto error;
418 }
419
420 if ((cur = tb[ROUTE_TARGET]) != NULL) {
421 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
422 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
423 goto error;
424 }
425 }
426
427 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
428 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
429 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
430 goto error;
431 }
432 }
433
434 if ((cur = tb[ROUTE_METRIC]) != NULL) {
435 route->metric = blobmsg_get_u32(cur);
436 route->flags |= DEVROUTE_METRIC;
437 }
438
439 if ((cur = tb[ROUTE_MTU]) != NULL) {
440 route->mtu = blobmsg_get_u32(cur);
441 route->flags |= DEVROUTE_MTU;
442 }
443
444 /* Use source-based routing */
445 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
446 char *saveptr, *source = alloca(blobmsg_data_len(cur));
447 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
448
449 const char *addr = strtok_r(source, "/", &saveptr);
450 const char *mask = strtok_r(NULL, "/", &saveptr);
451
452 if (!addr || inet_pton(af, addr, &route->source) < 1) {
453 DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
454 goto error;
455 }
456
457 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
458 }
459
460 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
461 route->flags |= DEVROUTE_ONLINK;
462
463 if ((cur = tb[ROUTE_TABLE]) != NULL) {
464 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
465 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
466 goto error;
467 }
468
469 /* only set the table flag if not using the main (default) table */
470 if (system_is_default_rt_table(route->table))
471 route->table = 0;
472
473 if (route->table)
474 route->flags |= DEVROUTE_TABLE;
475 }
476
477 if ((cur = tb[ROUTE_VALID]) != NULL) {
478 int64_t valid = blobmsg_get_u32(cur);
479 int64_t valid_until = valid + (int64_t)system_get_rtime();
480 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) /* Catch overflow */
481 route->valid_until = valid_until;
482 }
483
484 if ((cur = tb[ROUTE_TYPE]) != NULL) {
485 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
486 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
487 goto error;
488 }
489 route->flags |= DEVROUTE_TYPE;
490 }
491
492 if ((cur = tb[ROUTE_PROTO]) != NULL) {
493 if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
494 DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
495 goto error;
496 }
497 route->flags |= DEVROUTE_PROTO;
498 }
499
500 interface_set_route_info(iface, route);
501 vlist_add(&ip->route, &route->node, route);
502 return;
503
504 error:
505 free(route);
506 }
507
508 static int
509 addr_cmp(const void *k1, const void *k2, void *ptr)
510 {
511 return memcmp(k1, k2, sizeof(struct device_addr) -
512 offsetof(struct device_addr, flags));
513 }
514
515 static int
516 neighbor_cmp(const void *k1, const void *k2, void *ptr)
517 {
518 const struct device_neighbor *n1 = k1, *n2 = k2;
519
520 return memcmp(&n1->addr, &n2->addr, sizeof(n2->addr));
521 }
522
523 static int
524 route_cmp(const void *k1, const void *k2, void *ptr)
525 {
526 const struct device_route *r1 = k1, *r2 = k2;
527
528 if (r1->mask != r2->mask)
529 return r2->mask - r1->mask;
530
531 if (r1->metric != r2->metric)
532 return r1->metric - r2->metric;
533
534 if (r1->flags != r2->flags)
535 return r2->flags - r1->flags;
536
537 if (r1->sourcemask != r2->sourcemask)
538 return r1->sourcemask - r2->sourcemask;
539
540 if (r1->table != r2->table)
541 return r1->table - r2->table;
542
543 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
544 if (maskcmp)
545 return maskcmp;
546
547 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
548 }
549
550 static int
551 prefix_cmp(const void *k1, const void *k2, void *ptr)
552 {
553 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
554 offsetof(struct device_prefix, addr));
555 }
556
557 static void
558 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
559 {
560 struct device *dev = iface->l3_dev.dev;
561 struct device_route *r = &addr->subnet;
562
563 if (addr->flags & DEVADDR_OFFLINK)
564 return;
565
566 if (!add) {
567 if (!addr->subnet.iface)
568 return;
569
570 system_del_route(dev, r);
571 memset(r, 0, sizeof(*r));
572 return;
573 }
574
575 r->iface = iface;
576 r->flags = addr->flags;
577 r->mask = addr->mask;
578 memcpy(&r->addr, &addr->addr, sizeof(r->addr));
579 clear_if_addr(&r->addr, r->mask);
580
581 if (!system_resolve_rt_proto("kernel", &r->proto))
582 return;
583
584 r->flags |= DEVROUTE_PROTO;
585 system_del_route(dev, r);
586
587 r->flags &= ~DEVROUTE_PROTO;
588 interface_set_route_info(iface, r);
589
590 system_add_route(dev, r);
591 }
592
593 static void
594 interface_add_addr_rules(struct device_addr *addr, bool enabled)
595 {
596 bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
597
598 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
599 (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
600 true);
601 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
602 &addr->addr, addr->mask, addr->policy_table, NULL,
603 NULL, false);
604 }
605
606 static void
607 interface_update_proto_addr(struct vlist_tree *tree,
608 struct vlist_node *node_new,
609 struct vlist_node *node_old)
610 {
611 struct interface_ip_settings *ip;
612 struct interface *iface;
613 struct device *dev;
614 struct device_addr *a_new = NULL, *a_old = NULL;
615 bool replace = false;
616 bool keep = false;
617 bool v6 = false;
618
619 ip = container_of(tree, struct interface_ip_settings, addr);
620 iface = ip->iface;
621 dev = iface->l3_dev.dev;
622
623 if (!node_new || !node_old)
624 iface->updated |= IUF_ADDRESS;
625
626 if (node_new) {
627 a_new = container_of(node_new, struct device_addr, node);
628
629 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
630 !a_new->broadcast) {
631
632 /* /31 and /32 addressing need 255.255.255.255
633 * as broadcast address. */
634 if (a_new->mask >= 31) {
635 a_new->broadcast = (uint32_t) ~0;
636 } else {
637 uint32_t mask = ~0;
638 uint32_t *a = (uint32_t *) &a_new->addr;
639
640 mask >>= a_new->mask;
641 a_new->broadcast = *a | htonl(mask);
642 }
643 }
644 }
645
646 if (node_old)
647 a_old = container_of(node_old, struct device_addr, node);
648
649 if (a_new && a_old) {
650 keep = true;
651
652 if (a_old->flags != a_new->flags || a_old->failed)
653 keep = false;
654
655 if (a_old->valid_until != a_new->valid_until ||
656 a_old->preferred_until != a_new->preferred_until)
657 replace = true;
658
659 if (((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
660 (a_new->broadcast != a_old->broadcast ||
661 a_new->point_to_point != a_old->point_to_point))
662 keep = false;
663 }
664
665 if (node_old) {
666 if (a_old->enabled && !keep) {
667 /*
668 * This is needed for source routing to work correctly. If a device
669 * has two connections to a network using the same subnet, adding
670 * only the network-rule will cause packets to be routed through the
671 * first matching network (source IP matches both masks)
672 */
673 if (a_old->policy_table)
674 interface_add_addr_rules(a_old, false);
675
676 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
677 interface_handle_subnet_route(iface, a_old, false);
678 system_del_address(dev, a_old);
679 }
680 }
681 free(a_old->pclass);
682 free(a_old);
683 }
684
685 if (node_new) {
686 a_new->enabled = true;
687
688 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
689 v6 = true;
690
691 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
692
693 if (!keep || replace) {
694 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
695 if (system_add_address(dev, a_new))
696 a_new->failed = true;
697
698 if (iface->metric || a_new->policy_table)
699 interface_handle_subnet_route(iface, a_new, true);
700 }
701
702 if (!keep) {
703 if (a_new->policy_table)
704 interface_add_addr_rules(a_new, true);
705 }
706 }
707 }
708 }
709
710 static bool
711 enable_route(struct interface_ip_settings *ip, struct device_route *route)
712 {
713 if (ip->no_defaultroute && !route->mask)
714 return false;
715
716 return ip->enabled;
717 }
718
719 static void
720 interface_update_proto_neighbor(struct vlist_tree *tree,
721 struct vlist_node * node_new,
722 struct vlist_node *node_old)
723 {
724 struct device *dev;
725 struct device_neighbor *neighbor_old, *neighbor_new;
726 struct interface_ip_settings *ip;
727 bool keep = false;
728
729 ip = container_of(tree, struct interface_ip_settings, neighbor);
730 dev = ip->iface->l3_dev.dev;
731
732 neighbor_old = container_of(node_old, struct device_neighbor, node);
733 neighbor_new = container_of(node_new, struct device_neighbor, node);
734
735 if (node_old && node_new) {
736 keep = (!memcmp(neighbor_old->macaddr, neighbor_new->macaddr, sizeof(neighbor_old->macaddr)) &&
737 (neighbor_old->proxy == neighbor_new->proxy) &&
738 (neighbor_old->router == neighbor_new->router));
739 }
740
741 if (node_old) {
742 if (!keep && neighbor_old->enabled)
743 system_del_neighbor(dev, neighbor_old);
744
745 free(neighbor_old);
746 }
747
748 if (node_new) {
749 if (!keep && ip->enabled)
750 if (system_add_neighbor(dev, neighbor_new))
751 neighbor_new->failed = true;
752
753 neighbor_new->enabled = ip->enabled;
754 }
755 }
756
757 static void
758 interface_update_proto_route(struct vlist_tree *tree,
759 struct vlist_node *node_new,
760 struct vlist_node *node_old)
761 {
762 struct interface_ip_settings *ip;
763 struct interface *iface;
764 struct device *dev;
765 struct device_route *route_old, *route_new;
766 bool keep = false;
767
768 ip = container_of(tree, struct interface_ip_settings, route);
769 iface = ip->iface;
770 dev = iface->l3_dev.dev;
771
772 if (!node_new || !node_old)
773 iface->updated |= IUF_ROUTE;
774
775 route_old = container_of(node_old, struct device_route, node);
776 route_new = container_of(node_new, struct device_route, node);
777
778 if (node_old && node_new)
779 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
780 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
781 (route_old->proto == route_new->proto) && !route_old->failed;
782
783 if (node_old) {
784 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
785 system_del_route(dev, route_old);
786
787 free(route_old);
788 }
789
790 if (node_new) {
791 bool _enabled = enable_route(ip, route_new);
792
793 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
794 if (system_add_route(dev, route_new))
795 route_new->failed = true;
796
797 route_new->iface = iface;
798 route_new->enabled = _enabled;
799 }
800 }
801
802 static void
803 interface_update_host_route(struct vlist_tree *tree,
804 struct vlist_node *node_new,
805 struct vlist_node *node_old)
806 {
807 struct interface *iface;
808 struct device *dev;
809 struct device_route *route_old, *route_new;
810
811 iface = container_of(tree, struct interface, host_routes);
812 dev = iface->l3_dev.dev;
813
814 route_old = container_of(node_old, struct device_route, node);
815 route_new = container_of(node_new, struct device_route, node);
816
817 if (node_old) {
818 system_del_route(dev, route_old);
819 free(route_old);
820 }
821
822 if (node_new) {
823 if (system_add_route(dev, route_new))
824 route_new->failed = true;
825 }
826 }
827
828 static void
829 random_ifaceid(struct in6_addr *addr)
830 {
831 static bool initialized = false;
832 struct timeval t;
833
834 if (!initialized) {
835 long int seed = 0;
836 gettimeofday(&t, NULL);
837 seed = t.tv_sec ^ t.tv_usec ^ getpid();
838 srand48(seed);
839 initialized = true;
840 }
841 addr->s6_addr32[2] = (uint32_t)mrand48();
842 addr->s6_addr32[3] = (uint32_t)mrand48();
843 }
844
845 static bool
846 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
847 {
848 struct device_settings st;
849
850 device_merge_settings(iface->l3_dev.dev, &st);
851
852 if (!(st.flags & DEV_OPT_MACADDR))
853 return false;
854
855 /* get mac address */
856 uint8_t *ifaceid = addr->s6_addr + 8;
857 memcpy(ifaceid, st.macaddr, 3);
858 memcpy(ifaceid + 5, st.macaddr + 3, 3);
859 ifaceid[3] = 0xff;
860 ifaceid[4] = 0xfe;
861 ifaceid[0] ^= 0x02;
862
863 return true;
864 }
865
866 static bool
867 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
868 {
869 bool ret = true;
870
871 /* generate new iface id */
872 switch (iface->assignment_iface_id_selection) {
873 case IFID_FIXED:
874 /* fixed */
875 /* copy host part from assignment_fixed_iface_id */
876 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
877 break;
878 case IFID_RANDOM:
879 /* randomize last 64 bits */
880 random_ifaceid(addr);
881 break;
882 case IFID_EUI64:
883 /* eui64 */
884 ret = eui64_ifaceid(iface, addr);
885 break;
886 default:
887 ret = false;
888 break;
889 }
890 return ret;
891 }
892
893 static void
894 interface_set_prefix_address(struct device_prefix_assignment *assignment,
895 const struct device_prefix *prefix, struct interface *iface, bool add)
896 {
897 const struct interface *uplink = prefix->iface;
898 if (!iface->l3_dev.dev)
899 return;
900
901 struct device *l3_downlink = iface->l3_dev.dev;
902
903 struct device_addr addr;
904 struct device_route route;
905 memset(&addr, 0, sizeof(addr));
906 memset(&route, 0, sizeof(route));
907
908 addr.addr.in6 = assignment->addr;
909 addr.mask = assignment->length;
910 addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
911 addr.preferred_until = prefix->preferred_until;
912 addr.valid_until = prefix->valid_until;
913
914 route.flags = DEVADDR_INET6;
915 route.mask = addr.mask < 64 ? 64 : addr.mask;
916 route.addr = addr.addr;
917
918 if (!add && assignment->enabled) {
919 time_t now = system_get_rtime();
920
921 addr.preferred_until = now;
922 if (!addr.valid_until || addr.valid_until - now > 7200)
923 addr.valid_until = now + 7200;
924
925 if (iface->ip6table)
926 set_ip_source_policy(false, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
927 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
928
929 if (prefix->iface) {
930 if (prefix->iface->ip6table)
931 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
932 addr.mask, prefix->iface->ip6table, iface, NULL, true);
933
934 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
935 addr.mask, 0, iface, "unreachable", true);
936 }
937
938 clear_if_addr(&route.addr, route.mask);
939 interface_set_route_info(iface, &route);
940
941 system_del_route(l3_downlink, &route);
942 system_add_address(l3_downlink, &addr);
943
944 assignment->addr = in6addr_any;
945 assignment->enabled = false;
946 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
947 if (IN6_IS_ADDR_UNSPECIFIED(&addr.addr.in6)) {
948 addr.addr.in6 = prefix->addr;
949 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
950 if (!generate_ifaceid(iface, &addr.addr.in6))
951 return;
952
953 assignment->addr = addr.addr.in6;
954 route.addr = addr.addr;
955 }
956
957 if (system_add_address(l3_downlink, &addr))
958 return;
959
960 if (!assignment->enabled) {
961 if (iface->ip6table)
962 set_ip_source_policy(true, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
963 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
964
965 if (prefix->iface) {
966 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
967 addr.mask, 0, iface, "unreachable", true);
968
969 if (prefix->iface->ip6table)
970 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
971 addr.mask, prefix->iface->ip6table, iface, NULL, true);
972 }
973 }
974
975 clear_if_addr(&route.addr, route.mask);
976 interface_set_route_info(iface, &route);
977
978 system_add_route(l3_downlink, &route);
979
980 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
981 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
982 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
983
984 if (mtu > 0 && mtu_old != mtu) {
985 if (system_update_ipv6_mtu(l3_downlink, mtu) < 0)
986 netifd_log_message(L_WARNING, "Failed to set IPv6 mtu to %d"
987 "on interface '%s'\n", mtu, iface->name);
988 }
989 }
990
991 assignment->enabled = true;
992 }
993 }
994
995 static bool interface_prefix_assign(struct list_head *list,
996 struct device_prefix_assignment *assign)
997 {
998 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
999 struct device_prefix_assignment *c;
1000 list_for_each_entry(c, list, head) {
1001 if (assign->assigned != -1) {
1002 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
1003 list_add_tail(&assign->head, &c->head);
1004 return true;
1005 }
1006 } else if (assign->assigned == -1) {
1007 current = (current + asize) & (~asize);
1008 if (current + asize < c->assigned) {
1009 assign->assigned = current;
1010 list_add_tail(&assign->head, &c->head);
1011 return true;
1012 }
1013 }
1014 current = (c->assigned + (1 << (64 - c->length)));
1015 }
1016 return false;
1017 }
1018
1019 /*
1020 * Sorting of assignment entries:
1021 * Primary on assignment length: smallest assignment first
1022 * Secondary on assignment weight: highest weight first
1023 * Finally alphabetical order of interface names
1024 */
1025 static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
1026 {
1027 const struct device_prefix_assignment *a1 = k1, *a2 = k2;
1028
1029 if (a1->length != a2->length)
1030 return a1->length - a2->length;
1031
1032 if (a1->weight != a2->weight)
1033 return a2->weight - a1->weight;
1034
1035 return strcmp(a1->name, a2->name);
1036 }
1037
1038 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
1039 {
1040 struct device_prefix_assignment *c;
1041 struct interface *iface;
1042
1043 /* Delete all assignments */
1044 while (!list_empty(&prefix->assignments)) {
1045 c = list_first_entry(&prefix->assignments,
1046 struct device_prefix_assignment, head);
1047 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1048 interface_set_prefix_address(c, prefix, iface, false);
1049 list_del(&c->head);
1050 free(c);
1051 }
1052
1053 if (!setup)
1054 return;
1055
1056 /* End-of-assignment sentinel */
1057 c = malloc(sizeof(*c) + 1);
1058 if (!c)
1059 return;
1060
1061 c->assigned = 1 << (64 - prefix->length);
1062 c->length = 64;
1063 c->name[0] = 0;
1064 c->addr = in6addr_any;
1065 list_add(&c->head, &prefix->assignments);
1066
1067 /* Excluded prefix */
1068 if (prefix->excl_length > 0) {
1069 const char name[] = "!excluded";
1070 c = malloc(sizeof(*c) + sizeof(name));
1071 if (c) {
1072 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
1073 ((1 << (64 - prefix->length)) - 1);
1074 c->length = prefix->excl_length;
1075 c->addr = in6addr_any;
1076 memcpy(c->name, name, sizeof(name));
1077 list_add(&c->head, &prefix->assignments);
1078 }
1079 }
1080
1081 bool assigned_any = false;
1082 struct {
1083 struct avl_node node;
1084 } *entry, *n_entry;
1085 struct avl_tree assign_later;
1086
1087 avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
1088
1089 vlist_for_each_element(&interfaces, iface, node) {
1090 if (iface->assignment_length < 48 ||
1091 iface->assignment_length > 64)
1092 continue;
1093
1094 /* Test whether there is a matching class */
1095 if (!list_empty(&iface->assignment_classes)) {
1096 bool found = false;
1097
1098 struct interface_assignment_class *c;
1099 list_for_each_entry(c, &iface->assignment_classes, head) {
1100 if (!strcmp(c->name, prefix->pclass)) {
1101 found = true;
1102 break;
1103 }
1104 }
1105
1106 if (!found)
1107 continue;
1108 }
1109
1110 size_t namelen = strlen(iface->name) + 1;
1111 c = malloc(sizeof(*c) + namelen);
1112 if (!c)
1113 continue;
1114
1115 c->length = iface->assignment_length;
1116 c->assigned = iface->assignment_hint;
1117 c->weight = iface->assignment_weight;
1118 c->addr = in6addr_any;
1119 c->enabled = false;
1120 memcpy(c->name, iface->name, namelen);
1121
1122 /* First process all custom assignments, put all others in later-list */
1123 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
1124 if (c->assigned != -1) {
1125 c->assigned = -1;
1126 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
1127 "of size %hhu for %s, trying other\n", c->length, c->name);
1128 }
1129
1130 entry = calloc(1, sizeof(*entry));
1131 if (!entry) {
1132 free(c);
1133 continue;
1134 }
1135
1136 entry->node.key = c;
1137 avl_insert(&assign_later, &entry->node);
1138 }
1139
1140 if (c->assigned != -1)
1141 assigned_any = true;
1142 }
1143
1144 /* Then try to assign all other + failed custom assignments */
1145 avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
1146 bool assigned = false;
1147
1148 c = (struct device_prefix_assignment *)entry->node.key;
1149 avl_delete(&assign_later, &entry->node);
1150
1151 do {
1152 assigned = interface_prefix_assign(&prefix->assignments, c);
1153 } while (!assigned && ++c->length <= 64);
1154
1155 if (!assigned) {
1156 netifd_log_message(L_WARNING, "Failed to assign subprefix "
1157 "of size %hhu for %s\n", c->length, c->name);
1158 free(c);
1159 } else
1160 assigned_any = true;
1161
1162 free(entry);
1163 }
1164
1165 list_for_each_entry(c, &prefix->assignments, head)
1166 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1167 interface_set_prefix_address(c, prefix, iface, true);
1168
1169 if (!assigned_any)
1170 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
1171 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
1172 }
1173
1174
1175 void interface_refresh_assignments(bool hint)
1176 {
1177 static bool refresh = false;
1178 if (!hint && refresh) {
1179 struct device_prefix *p;
1180 list_for_each_entry(p, &prefixes, head)
1181 interface_update_prefix_assignments(p, true);
1182 }
1183 refresh = hint;
1184 }
1185
1186 void interface_update_prefix_delegation(struct interface_ip_settings *ip)
1187 {
1188 struct device_prefix *prefix;
1189
1190 vlist_for_each_element(&ip->prefix, prefix, node) {
1191 interface_update_prefix_assignments(prefix, !ip->no_delegation);
1192
1193 if (ip->no_delegation) {
1194 if (prefix->head.next)
1195 list_del(&prefix->head);
1196 } else
1197 list_add(&prefix->head, &prefixes);
1198 }
1199 }
1200
1201 static void
1202 interface_update_prefix(struct vlist_tree *tree,
1203 struct vlist_node *node_new,
1204 struct vlist_node *node_old)
1205 {
1206 struct device_prefix *prefix_old, *prefix_new;
1207 prefix_old = container_of(node_old, struct device_prefix, node);
1208 prefix_new = container_of(node_new, struct device_prefix, node);
1209
1210 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
1211 if (tree && (!node_new || !node_old))
1212 ip->iface->updated |= IUF_PREFIX;
1213
1214 struct device_route route;
1215 memset(&route, 0, sizeof(route));
1216 route.flags = DEVADDR_INET6;
1217 route.metric = INT32_MAX;
1218 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
1219 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
1220
1221
1222 struct device_prefix_assignment *c;
1223 struct interface *iface;
1224
1225 if (node_old && node_new) {
1226 /* Move assignments and refresh addresses to update valid times */
1227 list_splice(&prefix_old->assignments, &prefix_new->assignments);
1228
1229 list_for_each_entry(c, &prefix_new->assignments, head)
1230 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1231 interface_set_prefix_address(c, prefix_new, iface, true);
1232
1233 if (prefix_new->preferred_until != prefix_old->preferred_until ||
1234 prefix_new->valid_until != prefix_old->valid_until)
1235 ip->iface->updated |= IUF_PREFIX;
1236 } else if (node_new) {
1237 /* Set null-route to avoid routing loops */
1238 system_add_route(NULL, &route);
1239
1240 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
1241 interface_update_prefix_assignments(prefix_new, true);
1242 } else if (node_old) {
1243 /* Remove null-route */
1244 interface_update_prefix_assignments(prefix_old, false);
1245 system_del_route(NULL, &route);
1246 }
1247
1248 if (node_old) {
1249 if (prefix_old->head.next)
1250 list_del(&prefix_old->head);
1251 free(prefix_old);
1252 }
1253
1254 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1255 list_add(&prefix_new->head, &prefixes);
1256
1257 }
1258
1259 struct device_prefix*
1260 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1261 uint8_t length, time_t valid_until, time_t preferred_until,
1262 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1263 {
1264 if (!pclass)
1265 pclass = (iface) ? iface->name : "local";
1266
1267 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1268 if (!prefix)
1269 return NULL;
1270
1271 prefix->length = length;
1272 prefix->addr = *addr;
1273 prefix->preferred_until = preferred_until;
1274 prefix->valid_until = valid_until;
1275 prefix->iface = iface;
1276 INIT_LIST_HEAD(&prefix->assignments);
1277
1278 if (excl_addr) {
1279 prefix->excl_addr = *excl_addr;
1280 prefix->excl_length = excl_length;
1281 }
1282
1283 strcpy(prefix->pclass, pclass);
1284
1285 if (iface)
1286 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1287 else
1288 interface_update_prefix(NULL, &prefix->node, NULL);
1289
1290 return prefix;
1291 }
1292
1293 void
1294 interface_ip_set_ula_prefix(const char *prefix)
1295 {
1296 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1297 if (prefix)
1298 strncpy(buf, prefix, sizeof(buf) - 1);
1299 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1300
1301 struct in6_addr addr;
1302 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1303 if (ula_prefix) {
1304 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1305 ula_prefix = NULL;
1306 }
1307 return;
1308 }
1309
1310 int length;
1311 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1312 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1313 return;
1314
1315 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1316 ula_prefix->length != length) {
1317 if (ula_prefix)
1318 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1319
1320 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1321 0, 0, NULL, 0, NULL);
1322 }
1323 }
1324
1325 static void
1326 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1327 {
1328 struct dns_server *s;
1329
1330 s = calloc(1, sizeof(*s));
1331 if (!s)
1332 return;
1333
1334 s->af = AF_INET;
1335 if (inet_pton(s->af, str, &s->addr.in))
1336 goto add;
1337
1338 s->af = AF_INET6;
1339 if (inet_pton(s->af, str, &s->addr.in))
1340 goto add;
1341
1342 free(s);
1343 return;
1344
1345 add:
1346 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1347 s->af == AF_INET6 ? '6' : '4', str);
1348 vlist_simple_add(&ip->dns_servers, &s->node);
1349 }
1350
1351 void
1352 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1353 {
1354 struct blob_attr *cur;
1355 int rem;
1356
1357 blobmsg_for_each_attr(cur, list, rem) {
1358 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1359 continue;
1360
1361 if (!blobmsg_check_attr(cur, NULL))
1362 continue;
1363
1364 interface_add_dns_server(ip, blobmsg_data(cur));
1365 }
1366 }
1367
1368 static void
1369 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1370 {
1371 struct dns_search_domain *s;
1372 int len = strlen(str);
1373
1374 s = calloc(1, sizeof(*s) + len + 1);
1375 if (!s)
1376 return;
1377
1378 D(INTERFACE, "Add DNS search domain: %s\n", str);
1379 memcpy(s->name, str, len);
1380 vlist_simple_add(&ip->dns_search, &s->node);
1381 }
1382
1383 void
1384 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1385 {
1386 struct blob_attr *cur;
1387 int rem;
1388
1389 blobmsg_for_each_attr(cur, list, rem) {
1390 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1391 continue;
1392
1393 if (!blobmsg_check_attr(cur, NULL))
1394 continue;
1395
1396 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1397 }
1398 }
1399
1400 static void
1401 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1402 {
1403 struct dns_server *s;
1404 struct dns_search_domain *d;
1405 const char *str;
1406 char buf[INET6_ADDRSTRLEN];
1407
1408 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1409 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1410 if (!str)
1411 continue;
1412
1413 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1414 fprintf(f, "nameserver %s%%%s\n", str, dev);
1415 else
1416 fprintf(f, "nameserver %s\n", str);
1417 }
1418
1419 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1420 fprintf(f, "search %s\n", d->name);
1421 }
1422 }
1423
1424 /* Sorting of interface resolver entries : */
1425 /* Primary on interface dns_metric : lowest metric first */
1426 /* Secondary on interface metric : lowest metric first */
1427 /* Finally alphabetical order of interface names */
1428 static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
1429 {
1430 const struct interface *iface1 = k1, *iface2 = k2;
1431
1432 if (iface1->dns_metric != iface2->dns_metric)
1433 return iface1->dns_metric - iface2->dns_metric;
1434
1435 if (iface1->metric != iface2->metric)
1436 return iface1->metric - iface2->metric;
1437
1438 return strcmp(iface1->name, iface2->name);
1439 }
1440
1441 static void
1442 __interface_write_dns_entries(FILE *f)
1443 {
1444 struct interface *iface;
1445 struct {
1446 struct avl_node node;
1447 } *entry, *n_entry;
1448 struct avl_tree resolv_conf_iface_entries;
1449
1450 avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
1451
1452 vlist_for_each_element(&interfaces, iface, node) {
1453 if (iface->state != IFS_UP)
1454 continue;
1455
1456 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1457 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1458 vlist_simple_empty(&iface->config_ip.dns_search) &&
1459 vlist_simple_empty(&iface->config_ip.dns_servers))
1460 continue;
1461
1462 entry = calloc(1, sizeof(*entry));
1463 if (!entry)
1464 continue;
1465
1466 entry->node.key = iface;
1467 avl_insert(&resolv_conf_iface_entries, &entry->node);
1468 }
1469
1470 avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
1471 iface = (struct interface *)entry->node.key;
1472 struct device *dev = iface->l3_dev.dev;
1473
1474 fprintf(f, "# Interface %s\n", iface->name);
1475
1476 write_resolv_conf_entries(f, &iface->config_ip, dev->ifname);
1477
1478 if (!iface->proto_ip.no_dns)
1479 write_resolv_conf_entries(f, &iface->proto_ip, dev->ifname);
1480 }
1481
1482 avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
1483 free(entry);
1484 }
1485
1486 void
1487 interface_write_resolv_conf(void)
1488 {
1489 char *path = alloca(strlen(resolv_conf) + 5);
1490 FILE *f;
1491 uint32_t crcold, crcnew;
1492
1493 sprintf(path, "%s.tmp", resolv_conf);
1494 unlink(path);
1495 f = fopen(path, "w+");
1496 if (!f) {
1497 D(INTERFACE, "Failed to open %s for writing\n", path);
1498 return;
1499 }
1500
1501 __interface_write_dns_entries(f);
1502
1503 fflush(f);
1504 rewind(f);
1505 crcnew = crc32_file(f);
1506 fclose(f);
1507
1508 crcold = crcnew + 1;
1509 f = fopen(resolv_conf, "r");
1510 if (f) {
1511 crcold = crc32_file(f);
1512 fclose(f);
1513 }
1514
1515 if (crcold == crcnew) {
1516 unlink(path);
1517 } else if (rename(path, resolv_conf) < 0) {
1518 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1519 unlink(path);
1520 }
1521 }
1522
1523 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1524 {
1525 struct device_addr *addr;
1526 struct device_route *route;
1527 struct device_neighbor *neighbor;
1528 struct device *dev;
1529 struct interface *iface;
1530
1531 ip->enabled = enabled;
1532 iface = ip->iface;
1533 dev = iface->l3_dev.dev;
1534 if (!dev)
1535 return;
1536
1537 vlist_for_each_element(&ip->addr, addr, node) {
1538 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1539
1540 if (addr->flags & DEVADDR_EXTERNAL)
1541 continue;
1542
1543 if (addr->enabled == enabled)
1544 continue;
1545
1546 if (enabled) {
1547 system_add_address(dev, addr);
1548
1549 addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1550 if (iface->metric || addr->policy_table)
1551 interface_handle_subnet_route(iface, addr, true);
1552
1553 if (addr->policy_table)
1554 interface_add_addr_rules(addr, true);
1555 } else {
1556 interface_handle_subnet_route(iface, addr, false);
1557 system_del_address(dev, addr);
1558
1559 if (addr->policy_table)
1560 interface_add_addr_rules(addr, false);
1561 }
1562 addr->enabled = enabled;
1563 }
1564
1565 vlist_for_each_element(&ip->route, route, node) {
1566 bool _enabled = enabled;
1567
1568 if (route->flags & DEVADDR_EXTERNAL)
1569 continue;
1570
1571 if (!enable_route(ip, route))
1572 _enabled = false;
1573 if (route->enabled == _enabled)
1574 continue;
1575
1576 if (_enabled) {
1577 interface_set_route_info(ip->iface, route);
1578
1579 if (system_add_route(dev, route))
1580 route->failed = true;
1581 } else
1582 system_del_route(dev, route);
1583 route->enabled = _enabled;
1584 }
1585
1586 vlist_for_each_element(&ip->neighbor, neighbor, node) {
1587 if (neighbor->enabled == enabled)
1588 continue;
1589
1590 if (enabled) {
1591 if(system_add_neighbor(dev, neighbor))
1592 neighbor->failed = true;
1593 } else
1594 system_del_neighbor(dev, neighbor);
1595
1596 neighbor->enabled = enabled;
1597 }
1598
1599 struct device_prefix *c;
1600 struct device_prefix_assignment *a;
1601 list_for_each_entry(c, &prefixes, head)
1602 list_for_each_entry(a, &c->assignments, head)
1603 if (!strcmp(a->name, ip->iface->name))
1604 interface_set_prefix_address(a, c, ip->iface, enabled);
1605
1606 if (ip->iface->policy_rules_set != enabled &&
1607 ip->iface->l3_dev.dev) {
1608 set_ip_lo_policy(enabled, true, ip->iface);
1609 set_ip_lo_policy(enabled, false, ip->iface);
1610
1611 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1612 NULL, 0, 0, ip->iface, "failed_policy", true);
1613 ip->iface->policy_rules_set = enabled;
1614 }
1615 }
1616
1617 void
1618 interface_ip_update_start(struct interface_ip_settings *ip)
1619 {
1620 if (ip != &ip->iface->config_ip) {
1621 vlist_simple_update(&ip->dns_servers);
1622 vlist_simple_update(&ip->dns_search);
1623 }
1624 vlist_update(&ip->route);
1625 vlist_update(&ip->addr);
1626 vlist_update(&ip->prefix);
1627 vlist_update(&ip->neighbor);
1628 }
1629
1630 void
1631 interface_ip_update_complete(struct interface_ip_settings *ip)
1632 {
1633 vlist_simple_flush(&ip->dns_servers);
1634 vlist_simple_flush(&ip->dns_search);
1635 vlist_flush(&ip->route);
1636 vlist_flush(&ip->addr);
1637 vlist_flush(&ip->prefix);
1638 vlist_flush(&ip->neighbor);
1639 interface_write_resolv_conf();
1640 }
1641
1642 void
1643 interface_ip_flush(struct interface_ip_settings *ip)
1644 {
1645 if (ip == &ip->iface->proto_ip)
1646 vlist_flush_all(&ip->iface->host_routes);
1647 vlist_simple_flush_all(&ip->dns_servers);
1648 vlist_simple_flush_all(&ip->dns_search);
1649 vlist_flush_all(&ip->route);
1650 vlist_flush_all(&ip->addr);
1651 vlist_flush_all(&ip->neighbor);
1652 vlist_flush_all(&ip->prefix);
1653 }
1654
1655 static void
1656 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1657 {
1658 ip->iface = iface;
1659 ip->enabled = true;
1660 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1661 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1662 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1663 vlist_init(&ip->neighbor, neighbor_cmp, interface_update_proto_neighbor);
1664 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1665 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1666 }
1667
1668 void
1669 interface_ip_init(struct interface *iface)
1670 {
1671 __interface_ip_init(&iface->proto_ip, iface);
1672 __interface_ip_init(&iface->config_ip, iface);
1673 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1674 }
1675
1676 static void
1677 interface_ip_valid_until_handler(struct uloop_timeout *t)
1678 {
1679 time_t now = system_get_rtime();
1680 struct interface *iface;
1681 vlist_for_each_element(&interfaces, iface, node) {
1682 if (iface->state != IFS_UP)
1683 continue;
1684
1685 struct device_addr *addr, *addrp;
1686 struct device_route *route, *routep;
1687 struct device_prefix *pref, *prefp;
1688
1689 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1690 if (addr->valid_until && addr->valid_until < now)
1691 vlist_delete(&iface->proto_ip.addr, &addr->node);
1692
1693 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1694 if (route->valid_until && route->valid_until < now)
1695 vlist_delete(&iface->proto_ip.route, &route->node);
1696
1697 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1698 if (pref->valid_until && pref->valid_until < now)
1699 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1700
1701 }
1702
1703 uloop_timeout_set(t, 1000);
1704 }
1705
1706 static void __init
1707 interface_ip_init_worker(void)
1708 {
1709 valid_until_timeout.cb = interface_ip_valid_until_handler;
1710 uloop_timeout_set(&valid_until_timeout, 1000);
1711 }
OpenWrt Network interface configuration daemon