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wireless: display log messages for setup/teardown/retry
[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 #include "netifd.h"
26 #include "device.h"
27 #include "interface.h"
28 #include "interface-ip.h"
29 #include "proto.h"
30 #include "ubus.h"
31 #include "system.h"
32
33 enum {
34 ROUTE_INTERFACE,
35 ROUTE_TARGET,
36 ROUTE_MASK,
37 ROUTE_GATEWAY,
38 ROUTE_METRIC,
39 ROUTE_MTU,
40 ROUTE_VALID,
41 ROUTE_TABLE,
42 ROUTE_SOURCE,
43 ROUTE_ONLINK,
44 ROUTE_TYPE,
45 ROUTE_PROTO,
46 ROUTE_DISABLED,
47 __ROUTE_MAX
48 };
49
50 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
51 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
52 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
53 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
54 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
55 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
56 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
57 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
58 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
59 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
60 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
61 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
62 [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
63 [ROUTE_DISABLED] = { .name = "disabled", .type = BLOBMSG_TYPE_BOOL },
64 };
65
66 const struct uci_blob_param_list route_attr_list = {
67 .n_params = __ROUTE_MAX,
68 .params = route_attr,
69 };
70
71 enum {
72 NEIGHBOR_INTERFACE,
73 NEIGHBOR_ADDRESS,
74 NEIGHBOR_MAC,
75 NEIGHBOR_PROXY,
76 NEIGHBOR_ROUTER,
77 __NEIGHBOR_MAX
78 };
79
80 static const struct blobmsg_policy neighbor_attr[__NEIGHBOR_MAX]={
81 [NEIGHBOR_INTERFACE]= { .name = "interface", .type = BLOBMSG_TYPE_STRING},
82 [NEIGHBOR_ADDRESS]= { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING},
83 [NEIGHBOR_MAC]= { .name = "mac", .type = BLOBMSG_TYPE_STRING},
84 [NEIGHBOR_PROXY]= { .name = "proxy", .type = BLOBMSG_TYPE_BOOL},
85 [NEIGHBOR_ROUTER]= {.name = "router", .type = BLOBMSG_TYPE_BOOL},
86 };
87
88 const struct uci_blob_param_list neighbor_attr_list = {
89 .n_params = __NEIGHBOR_MAX,
90 .params = neighbor_attr,
91 };
92
93
94 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
95 static struct device_prefix *ula_prefix = NULL;
96 static struct uloop_timeout valid_until_timeout;
97
98
99 static void
100 clear_if_addr(union if_addr *a, int mask)
101 {
102 int m_bytes = (mask + 7) / 8;
103 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
104 uint8_t *p = (uint8_t *) a;
105
106 if (m_bytes < sizeof(*a))
107 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
108
109 p[m_bytes - 1] &= ~m_clear;
110 }
111
112 static bool
113 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
114 {
115 union if_addr *p1, *p2;
116
117 p1 = alloca(sizeof(*a1));
118 p2 = alloca(sizeof(*a2));
119
120 memcpy(p1, a1, sizeof(*a1));
121 clear_if_addr(p1, mask);
122 memcpy(p2, a2, sizeof(*a2));
123 clear_if_addr(p2, mask);
124
125 return !memcmp(p1, p2, sizeof(*p1));
126 }
127
128 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
129 const union if_addr *addr, uint8_t mask, unsigned int table,
130 struct interface *in_iface, const char *action, bool src)
131 {
132 struct iprule rule = {
133 .flags = IPRULE_PRIORITY,
134 .priority = priority
135 };
136
137 if (addr) {
138 if (src) {
139 rule.flags |= IPRULE_SRC;
140 rule.src_addr = *addr;
141 rule.src_mask = mask;
142 } else {
143 rule.flags |= IPRULE_DEST;
144 rule.dest_addr = *addr;
145 rule.dest_mask = mask;
146 }
147 }
148
149 if (table) {
150 rule.flags |= IPRULE_LOOKUP;
151 rule.lookup = table;
152
153 if (!rule.lookup)
154 return 0;
155 } else if (action) {
156 rule.flags |= IPRULE_ACTION;
157 system_resolve_iprule_action(action, &rule.action);
158 }
159
160 if (in_iface && in_iface->l3_dev.dev) {
161 rule.flags |= IPRULE_IN;
162 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
163 }
164
165 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
166
167 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
168 }
169
170 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
171 {
172 struct iprule rule = {
173 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
174 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
175 .lookup = (v6) ? iface->ip6table : iface->ip4table,
176 .in_dev = "lo"
177 };
178
179 if (!rule.lookup)
180 return 0;
181
182 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
183
184 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
185 }
186
187 static bool
188 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
189 {
190 struct device_addr *addr;
191
192 vlist_for_each_element(&ip->addr, addr, node) {
193 if (!addr->enabled)
194 continue;
195
196 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
197 continue;
198
199 if (((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
200 addr->point_to_point && a->in.s_addr == addr->point_to_point)
201 return true;
202
203 /* Handle offlink addresses correctly */
204 unsigned int mask = addr->mask;
205 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
206 (addr->flags & DEVADDR_OFFLINK))
207 mask = 128;
208
209 if (!match_if_addr(&addr->addr, a, mask))
210 continue;
211
212 return true;
213 }
214
215 return false;
216 }
217
218 static void
219 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
220 bool v6, struct device_route **res)
221 {
222 struct device_route *route;
223
224 vlist_for_each_element(&ip->route, route, node) {
225 if (!route->enabled)
226 continue;
227
228 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
229 continue;
230
231 if (!match_if_addr(&route->addr, a, route->mask))
232 continue;
233
234 if (route->flags & DEVROUTE_TABLE)
235 continue;
236
237 if (!*res || route->mask > (*res)->mask)
238 *res = route;
239 }
240 }
241
242 static bool
243 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
244 {
245 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
246 __find_ip_addr_target(&iface->config_ip, a, v6);
247 }
248
249 static void
250 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
251 bool v6, struct device_route **route)
252 {
253 __find_ip_route_target(&iface->proto_ip, a, v6, route);
254 __find_ip_route_target(&iface->config_ip, a, v6, route);
255 }
256
257 struct interface *
258 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
259 {
260 struct device_route *route, *r_next = NULL;
261 bool defaultroute_target = false;
262 union if_addr addr_zero;
263 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
264
265 memset(&addr_zero, 0, sizeof(addr_zero));
266 if (memcmp(&addr_zero, addr, addrsize) == 0)
267 defaultroute_target = true;
268
269 if (iface) {
270 /* look for locally addressable target first */
271 if (interface_ip_find_addr_target(iface, addr, v6))
272 return iface;
273
274 /* do not stop at the first route, let the lookup compare
275 * masks to find the best match */
276 interface_ip_find_route_target(iface, addr, v6, &r_next);
277 } else {
278 vlist_for_each_element(&interfaces, iface, node) {
279 /* look for locally addressable target first */
280 if (interface_ip_find_addr_target(iface, addr, v6))
281 return iface;
282
283 /* do not stop at the first route, let the lookup compare
284 * masks to find the best match */
285 interface_ip_find_route_target(iface, addr, v6, &r_next);
286 }
287 }
288
289 if (!r_next)
290 return NULL;
291
292 iface = r_next->iface;
293 if (defaultroute_target)
294 return iface;
295
296 route = calloc(1, sizeof(*route));
297 if (!route)
298 return NULL;
299
300 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
301 route->mask = v6 ? 128 : 32;
302 memcpy(&route->addr, addr, addrsize);
303 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
304 route->mtu = r_next->mtu;
305 route->metric = r_next->metric;
306 route->table = r_next->table;
307 route->iface = iface;
308 vlist_add(&iface->host_routes, &route->node, route);
309
310 return iface;
311 }
312
313 static void
314 interface_set_route_info(struct interface *iface, struct device_route *route)
315 {
316 bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
317
318 if (!iface)
319 return;
320
321 if (!(route->flags & DEVROUTE_METRIC))
322 route->metric = iface->metric;
323
324 if (!(route->flags & DEVROUTE_TABLE)) {
325 route->table = (v6) ? iface->ip6table : iface->ip4table;
326 if (route->table)
327 route->flags |= DEVROUTE_SRCTABLE;
328 }
329 }
330
331 void
332 interface_ip_add_neighbor(struct interface *iface, struct blob_attr *attr, bool v6)
333 {
334 struct interface_ip_settings *ip;
335 struct blob_attr *tb[__NEIGHBOR_MAX], *cur;
336 struct device_neighbor *neighbor;
337 int af = v6 ? AF_INET6: AF_INET;
338 struct ether_addr *ea;
339
340 blobmsg_parse(neighbor_attr, __NEIGHBOR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
341
342 if (!iface) {
343 if ((cur = tb[NEIGHBOR_INTERFACE]) == NULL)
344 return;
345
346 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
347
348 if (!iface)
349 return;
350
351 ip = &iface->config_ip;
352 } else
353 ip = &iface->proto_ip;
354
355 neighbor = calloc(1,sizeof(*neighbor));
356 if (!neighbor)
357 return;
358
359 neighbor->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
360
361 if ((cur = tb[NEIGHBOR_ADDRESS]) != NULL){
362 if (!inet_pton(af, blobmsg_data(cur), &neighbor->addr))
363 goto error;
364 } else
365 goto error;
366
367 if ((cur = tb[NEIGHBOR_MAC]) != NULL) {
368 neighbor->flags |= DEVNEIGH_MAC;
369 ea = ether_aton(blobmsg_data(cur));
370 if (!ea)
371 goto error;
372
373 memcpy(neighbor->macaddr, ea, 6);
374 }
375
376 if ((cur = tb[NEIGHBOR_PROXY]) != NULL)
377 neighbor->proxy = blobmsg_get_bool(cur);
378
379 if ((cur = tb[NEIGHBOR_ROUTER]) != NULL)
380 neighbor->router = blobmsg_get_bool(cur);
381
382 vlist_add(&ip->neighbor, &neighbor->node, neighbor);
383 return;
384
385 error:
386 free(neighbor);
387 }
388
389 void
390 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
391 {
392 struct interface_ip_settings *ip;
393 struct blob_attr *tb[__ROUTE_MAX], *cur;
394 struct device_route *route;
395 int af = v6 ? AF_INET6 : AF_INET;
396
397 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
398
399 if ((cur = tb[ROUTE_DISABLED]) != NULL && blobmsg_get_bool(cur))
400 return;
401
402 if (!iface) {
403 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
404 return;
405
406 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
407 if (!iface)
408 return;
409
410 ip = &iface->config_ip;
411 } else {
412 ip = &iface->proto_ip;
413 }
414
415 route = calloc(1, sizeof(*route));
416 if (!route)
417 return;
418
419 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
420 route->mask = v6 ? 128 : 32;
421 if ((cur = tb[ROUTE_MASK]) != NULL) {
422 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
423 if (route->mask > (v6 ? 128 : 32))
424 goto error;
425 }
426
427 if ((cur = tb[ROUTE_TARGET]) != NULL) {
428 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
429 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
430 goto error;
431 }
432 }
433
434 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
435 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
436 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
437 goto error;
438 }
439 }
440
441 if ((cur = tb[ROUTE_METRIC]) != NULL) {
442 route->metric = blobmsg_get_u32(cur);
443 route->flags |= DEVROUTE_METRIC;
444 }
445
446 if ((cur = tb[ROUTE_MTU]) != NULL) {
447 route->mtu = blobmsg_get_u32(cur);
448 route->flags |= DEVROUTE_MTU;
449 }
450
451 /* Use source-based routing */
452 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
453 char *saveptr, *source = alloca(blobmsg_data_len(cur));
454 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
455
456 const char *addr = strtok_r(source, "/", &saveptr);
457 const char *mask = strtok_r(NULL, "/", &saveptr);
458
459 if (!addr || inet_pton(af, addr, &route->source) < 1) {
460 DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
461 goto error;
462 }
463
464 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
465 }
466
467 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
468 route->flags |= DEVROUTE_ONLINK;
469
470 if ((cur = tb[ROUTE_TABLE]) != NULL) {
471 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
472 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
473 goto error;
474 }
475
476 /* only set the table flag if not using the main (default) table */
477 if (system_is_default_rt_table(route->table))
478 route->table = 0;
479
480 if (route->table)
481 route->flags |= DEVROUTE_TABLE;
482 }
483
484 if ((cur = tb[ROUTE_VALID]) != NULL) {
485 int64_t valid = blobmsg_get_u32(cur);
486 int64_t valid_until = valid + (int64_t)system_get_rtime();
487 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) /* Catch overflow */
488 route->valid_until = valid_until;
489 }
490
491 if ((cur = tb[ROUTE_TYPE]) != NULL) {
492 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
493 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
494 goto error;
495 }
496 route->flags |= DEVROUTE_TYPE;
497 }
498
499 if ((cur = tb[ROUTE_PROTO]) != NULL) {
500 if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
501 DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
502 goto error;
503 }
504 route->flags |= DEVROUTE_PROTO;
505 }
506
507 interface_set_route_info(iface, route);
508 vlist_add(&ip->route, &route->node, route);
509 return;
510
511 error:
512 free(route);
513 }
514
515 static int
516 addr_cmp(const void *k1, const void *k2, void *ptr)
517 {
518 const struct device_addr *a1 = k1;
519 const struct device_addr *a2 = k2;
520 const int cmp_offset = offsetof(struct device_addr, flags);
521 const int cmp_size = sizeof(struct device_addr) - cmp_offset;
522
523 if (a1->index != a2->index)
524 return a1->index - a2->index;
525 return memcmp(k1+cmp_offset, k2+cmp_offset, cmp_size);
526 }
527
528 static int
529 neighbor_cmp(const void *k1, const void *k2, void *ptr)
530 {
531 const struct device_neighbor *n1 = k1, *n2 = k2;
532
533 return memcmp(&n1->addr, &n2->addr, sizeof(n2->addr));
534 }
535
536 static int
537 route_cmp(const void *k1, const void *k2, void *ptr)
538 {
539 const struct device_route *r1 = k1, *r2 = k2;
540
541 if (r1->mask != r2->mask)
542 return r2->mask - r1->mask;
543
544 if (r1->metric != r2->metric)
545 return r1->metric - r2->metric;
546
547 if (r1->flags != r2->flags)
548 return r2->flags - r1->flags;
549
550 if (r1->sourcemask != r2->sourcemask)
551 return r1->sourcemask - r2->sourcemask;
552
553 if (r1->table != r2->table)
554 return r1->table - r2->table;
555
556 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
557 if (maskcmp)
558 return maskcmp;
559
560 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
561 }
562
563 static int
564 prefix_cmp(const void *k1, const void *k2, void *ptr)
565 {
566 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
567 offsetof(struct device_prefix, addr));
568 }
569
570 static void
571 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
572 {
573 struct device *dev = iface->l3_dev.dev;
574 struct device_route *r = &addr->subnet;
575
576 if (addr->flags & DEVADDR_OFFLINK)
577 return;
578
579 if (!add) {
580 if (!addr->subnet.iface)
581 return;
582
583 system_del_route(dev, r);
584 memset(r, 0, sizeof(*r));
585 return;
586 }
587
588 r->iface = iface;
589 r->flags = addr->flags;
590 r->mask = addr->mask;
591 memcpy(&r->addr, &addr->addr, sizeof(r->addr));
592 clear_if_addr(&r->addr, r->mask);
593
594 if (!system_resolve_rt_proto("kernel", &r->proto))
595 return;
596
597 r->flags |= DEVROUTE_PROTO;
598 system_del_route(dev, r);
599
600 r->flags &= ~DEVROUTE_PROTO;
601 interface_set_route_info(iface, r);
602
603 system_add_route(dev, r);
604 }
605
606 static void
607 interface_add_addr_rules(struct device_addr *addr, bool enabled)
608 {
609 bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
610
611 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
612 (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
613 true);
614 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
615 &addr->addr, addr->mask, addr->policy_table, NULL,
616 NULL, false);
617 }
618
619 static void
620 interface_update_proto_addr(struct vlist_tree *tree,
621 struct vlist_node *node_new,
622 struct vlist_node *node_old)
623 {
624 struct interface_ip_settings *ip;
625 struct interface *iface;
626 struct device *dev;
627 struct device_addr *a_new = NULL, *a_old = NULL;
628 bool replace = false;
629 bool keep = false;
630 bool v6 = false;
631
632 ip = container_of(tree, struct interface_ip_settings, addr);
633 iface = ip->iface;
634 dev = iface->l3_dev.dev;
635
636 if (!node_new || !node_old)
637 iface->updated |= IUF_ADDRESS;
638
639 if (node_new) {
640 a_new = container_of(node_new, struct device_addr, node);
641
642 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
643 !a_new->broadcast) {
644
645 /* /31 and /32 addressing need 255.255.255.255
646 * as broadcast address. */
647 if (a_new->mask >= 31) {
648 a_new->broadcast = (uint32_t) ~0;
649 } else {
650 uint32_t mask = ~0;
651 uint32_t *a = (uint32_t *) &a_new->addr;
652
653 mask >>= a_new->mask;
654 a_new->broadcast = *a | htonl(mask);
655 }
656 }
657 }
658
659 if (node_old)
660 a_old = container_of(node_old, struct device_addr, node);
661
662 if (a_new && a_old) {
663 keep = true;
664
665 if (a_old->flags != a_new->flags || a_old->failed)
666 keep = false;
667
668 if (a_old->valid_until != a_new->valid_until ||
669 a_old->preferred_until != a_new->preferred_until)
670 replace = true;
671
672 if (((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
673 (a_new->broadcast != a_old->broadcast ||
674 a_new->point_to_point != a_old->point_to_point))
675 keep = false;
676 }
677
678 if (node_old) {
679 if (a_old->enabled && !keep) {
680 /*
681 * This is needed for source routing to work correctly. If a device
682 * has two connections to a network using the same subnet, adding
683 * only the network-rule will cause packets to be routed through the
684 * first matching network (source IP matches both masks)
685 */
686 if (a_old->policy_table)
687 interface_add_addr_rules(a_old, false);
688
689 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
690 interface_handle_subnet_route(iface, a_old, false);
691 system_del_address(dev, a_old);
692
693 if ((a_old->flags & DEVADDR_OFFLINK) && (a_old->mask < (v6 ? 128 : 32))) {
694 struct device_route route;
695
696 memset(&route, 0, sizeof(route));
697 route.flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
698 route.metric = INT32_MAX;
699 route.mask = a_old->mask;
700 route.addr = a_old->addr;
701
702 clear_if_addr(&route.addr, route.mask);
703
704 /* Delete null-route */
705 system_del_route(NULL, &route);
706 }
707
708 }
709 }
710 free(a_old->pclass);
711 free(a_old);
712 }
713
714 if (node_new) {
715 a_new->enabled = true;
716
717 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
718 v6 = true;
719
720 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
721
722 if (!keep || replace) {
723 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
724 if (system_add_address(dev, a_new))
725 a_new->failed = true;
726
727 if (iface->metric || a_new->policy_table)
728 interface_handle_subnet_route(iface, a_new, true);
729 }
730
731 if (!keep) {
732 if (!(a_new->flags & DEVADDR_EXTERNAL) &&
733 (a_new->flags & DEVADDR_OFFLINK) &&
734 (a_new->mask < (v6 ? 128 : 32))) {
735 struct device_route route;
736
737 memset(&route, 0, sizeof(route));
738 route.flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
739 route.metric = INT32_MAX;
740 route.mask = a_new->mask;
741 route.addr = a_new->addr;
742
743 clear_if_addr(&route.addr, route.mask);
744
745 /*
746 * In case off link is specifed as address property
747 * add null-route to avoid routing loops
748 */
749 system_add_route(NULL, &route);
750 }
751
752 if (a_new->policy_table)
753 interface_add_addr_rules(a_new, true);
754 }
755 }
756 }
757 }
758
759 static bool
760 enable_route(struct interface_ip_settings *ip, struct device_route *route)
761 {
762 if (ip->no_defaultroute && !route->mask)
763 return false;
764
765 return ip->enabled;
766 }
767
768 static void
769 interface_update_proto_neighbor(struct vlist_tree *tree,
770 struct vlist_node * node_new,
771 struct vlist_node *node_old)
772 {
773 struct device *dev;
774 struct device_neighbor *neighbor_old, *neighbor_new;
775 struct interface_ip_settings *ip;
776 bool keep = false;
777
778 ip = container_of(tree, struct interface_ip_settings, neighbor);
779 dev = ip->iface->l3_dev.dev;
780
781 neighbor_old = container_of(node_old, struct device_neighbor, node);
782 neighbor_new = container_of(node_new, struct device_neighbor, node);
783
784 if (node_old && node_new) {
785 keep = (!memcmp(neighbor_old->macaddr, neighbor_new->macaddr, sizeof(neighbor_old->macaddr)) &&
786 (neighbor_old->proxy == neighbor_new->proxy) &&
787 (neighbor_old->router == neighbor_new->router));
788 }
789
790 if (node_old) {
791 if (!keep && neighbor_old->enabled)
792 system_del_neighbor(dev, neighbor_old);
793
794 free(neighbor_old);
795 }
796
797 if (node_new) {
798 if (!keep && ip->enabled)
799 if (system_add_neighbor(dev, neighbor_new))
800 neighbor_new->failed = true;
801
802 neighbor_new->enabled = ip->enabled;
803 }
804 }
805
806 static void
807 interface_update_proto_route(struct vlist_tree *tree,
808 struct vlist_node *node_new,
809 struct vlist_node *node_old)
810 {
811 struct interface_ip_settings *ip;
812 struct interface *iface;
813 struct device *dev;
814 struct device_route *route_old, *route_new;
815 bool keep = false;
816
817 ip = container_of(tree, struct interface_ip_settings, route);
818 iface = ip->iface;
819 dev = iface->l3_dev.dev;
820
821 if (!node_new || !node_old)
822 iface->updated |= IUF_ROUTE;
823
824 route_old = container_of(node_old, struct device_route, node);
825 route_new = container_of(node_new, struct device_route, node);
826
827 if (node_old && node_new)
828 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
829 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
830 (route_old->proto == route_new->proto) && !route_old->failed;
831
832 if (node_old) {
833 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
834 system_del_route(dev, route_old);
835
836 free(route_old);
837 }
838
839 if (node_new) {
840 bool _enabled = enable_route(ip, route_new);
841
842 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
843 if (system_add_route(dev, route_new))
844 route_new->failed = true;
845
846 route_new->iface = iface;
847 route_new->enabled = _enabled;
848 }
849 }
850
851 static void
852 interface_update_host_route(struct vlist_tree *tree,
853 struct vlist_node *node_new,
854 struct vlist_node *node_old)
855 {
856 struct interface *iface;
857 struct device *dev;
858 struct device_route *route_old, *route_new;
859
860 iface = container_of(tree, struct interface, host_routes);
861 dev = iface->l3_dev.dev;
862
863 route_old = container_of(node_old, struct device_route, node);
864 route_new = container_of(node_new, struct device_route, node);
865
866 if (node_old) {
867 system_del_route(dev, route_old);
868 free(route_old);
869 }
870
871 if (node_new) {
872 if (system_add_route(dev, route_new))
873 route_new->failed = true;
874 }
875 }
876
877 static void
878 random_ifaceid(struct in6_addr *addr)
879 {
880 static bool initialized = false;
881 struct timeval t;
882
883 if (!initialized) {
884 long int seed = 0;
885 gettimeofday(&t, NULL);
886 seed = t.tv_sec ^ t.tv_usec ^ getpid();
887 srand48(seed);
888 initialized = true;
889 }
890 addr->s6_addr32[2] = (uint32_t)mrand48();
891 addr->s6_addr32[3] = (uint32_t)mrand48();
892 }
893
894 static bool
895 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
896 {
897 struct device_settings st;
898
899 device_merge_settings(iface->l3_dev.dev, &st);
900
901 if (!(st.flags & DEV_OPT_MACADDR))
902 return false;
903
904 /* get mac address */
905 uint8_t *ifaceid = addr->s6_addr + 8;
906 memcpy(ifaceid, st.macaddr, 3);
907 memcpy(ifaceid + 5, st.macaddr + 3, 3);
908 ifaceid[3] = 0xff;
909 ifaceid[4] = 0xfe;
910 ifaceid[0] ^= 0x02;
911
912 return true;
913 }
914
915 static bool
916 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
917 {
918 bool ret = true;
919
920 /* generate new iface id */
921 switch (iface->assignment_iface_id_selection) {
922 case IFID_FIXED:
923 /* fixed */
924 /* copy host part from assignment_fixed_iface_id */
925 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
926 break;
927 case IFID_RANDOM:
928 /* randomize last 64 bits */
929 random_ifaceid(addr);
930 break;
931 case IFID_EUI64:
932 /* eui64 */
933 ret = eui64_ifaceid(iface, addr);
934 break;
935 default:
936 ret = false;
937 break;
938 }
939 return ret;
940 }
941
942 static void
943 interface_set_prefix_address(struct device_prefix_assignment *assignment,
944 const struct device_prefix *prefix, struct interface *iface, bool add)
945 {
946 const struct interface *uplink = prefix->iface;
947 if (!iface->l3_dev.dev)
948 return;
949
950 struct device *l3_downlink = iface->l3_dev.dev;
951
952 struct device_addr addr;
953 struct device_route route;
954 memset(&addr, 0, sizeof(addr));
955 memset(&route, 0, sizeof(route));
956
957 addr.addr.in6 = assignment->addr;
958 addr.mask = assignment->length;
959 addr.flags = DEVADDR_INET6;
960 addr.preferred_until = prefix->preferred_until;
961 addr.valid_until = prefix->valid_until;
962
963 route.flags = DEVADDR_INET6;
964 route.mask = addr.mask < 64 ? 64 : addr.mask;
965 route.addr = addr.addr;
966
967 if (!add && assignment->enabled) {
968 time_t now = system_get_rtime();
969
970 addr.preferred_until = now;
971 if (!addr.valid_until || addr.valid_until - now > 7200)
972 addr.valid_until = now + 7200;
973
974 if (iface->ip6table)
975 set_ip_source_policy(false, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
976 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
977
978 if (prefix->iface) {
979 if (prefix->iface->ip6table)
980 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
981 addr.mask, prefix->iface->ip6table, iface, NULL, true);
982
983 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
984 addr.mask, 0, iface, "unreachable", true);
985 }
986
987 clear_if_addr(&route.addr, route.mask);
988 interface_set_route_info(iface, &route);
989
990 system_del_route(l3_downlink, &route);
991 system_add_address(l3_downlink, &addr);
992
993 assignment->addr = in6addr_any;
994 assignment->enabled = false;
995 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
996 if (IN6_IS_ADDR_UNSPECIFIED(&addr.addr.in6)) {
997 addr.addr.in6 = prefix->addr;
998 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
999 if (!generate_ifaceid(iface, &addr.addr.in6))
1000 return;
1001
1002 assignment->addr = addr.addr.in6;
1003 route.addr = addr.addr;
1004 }
1005
1006 addr.flags |= DEVADDR_OFFLINK;
1007 if (system_add_address(l3_downlink, &addr))
1008 return;
1009
1010 if (!assignment->enabled) {
1011 if (iface->ip6table)
1012 set_ip_source_policy(true, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
1013 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
1014
1015 if (prefix->iface) {
1016 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
1017 addr.mask, 0, iface, "unreachable", true);
1018
1019 if (prefix->iface->ip6table)
1020 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
1021 addr.mask, prefix->iface->ip6table, iface, NULL, true);
1022 }
1023 }
1024
1025 clear_if_addr(&route.addr, route.mask);
1026 interface_set_route_info(iface, &route);
1027
1028 system_add_route(l3_downlink, &route);
1029
1030 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
1031 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
1032 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
1033
1034 if (mtu > 0 && mtu_old != mtu) {
1035 if (system_update_ipv6_mtu(l3_downlink, mtu) < 0 && mtu < mtu_old)
1036 netifd_log_message(L_WARNING, "Failed to set IPv6 mtu to %d "
1037 "on interface '%s'\n", mtu, iface->name);
1038 }
1039 }
1040
1041 assignment->enabled = true;
1042 }
1043 }
1044
1045 static bool interface_prefix_assign(struct list_head *list,
1046 struct device_prefix_assignment *assign)
1047 {
1048 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
1049 struct device_prefix_assignment *c;
1050 list_for_each_entry(c, list, head) {
1051 if (assign->assigned != -1) {
1052 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
1053 list_add_tail(&assign->head, &c->head);
1054 return true;
1055 }
1056 } else if (assign->assigned == -1) {
1057 current = (current + asize) & (~asize);
1058 if (current + asize < c->assigned) {
1059 assign->assigned = current;
1060 list_add_tail(&assign->head, &c->head);
1061 return true;
1062 }
1063 }
1064 current = (c->assigned + (1 << (64 - c->length)));
1065 }
1066 return false;
1067 }
1068
1069 /*
1070 * Sorting of assignment entries:
1071 * Primary on assignment length: smallest assignment first
1072 * Secondary on assignment weight: highest weight first
1073 * Finally alphabetical order of interface names
1074 */
1075 static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
1076 {
1077 const struct device_prefix_assignment *a1 = k1, *a2 = k2;
1078
1079 if (a1->length != a2->length)
1080 return a1->length - a2->length;
1081
1082 if (a1->weight != a2->weight)
1083 return a2->weight - a1->weight;
1084
1085 return strcmp(a1->name, a2->name);
1086 }
1087
1088 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
1089 {
1090 struct device_prefix_assignment *c;
1091 struct interface *iface;
1092
1093 /* Delete all assignments */
1094 while (!list_empty(&prefix->assignments)) {
1095 c = list_first_entry(&prefix->assignments,
1096 struct device_prefix_assignment, head);
1097 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1098 interface_set_prefix_address(c, prefix, iface, false);
1099 list_del(&c->head);
1100 free(c);
1101 }
1102
1103 if (!setup)
1104 return;
1105
1106 /* End-of-assignment sentinel */
1107 c = malloc(sizeof(*c) + 1);
1108 if (!c)
1109 return;
1110
1111 c->assigned = 1 << (64 - prefix->length);
1112 c->length = 64;
1113 c->name[0] = 0;
1114 c->addr = in6addr_any;
1115 list_add(&c->head, &prefix->assignments);
1116
1117 /* Excluded prefix */
1118 if (prefix->excl_length > 0) {
1119 const char name[] = "!excluded";
1120 c = malloc(sizeof(*c) + sizeof(name));
1121 if (c) {
1122 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
1123 ((1 << (64 - prefix->length)) - 1);
1124 c->length = prefix->excl_length;
1125 c->addr = in6addr_any;
1126 memcpy(c->name, name, sizeof(name));
1127 list_add(&c->head, &prefix->assignments);
1128 }
1129 }
1130
1131 bool assigned_any = false;
1132 struct {
1133 struct avl_node node;
1134 } *entry, *n_entry;
1135 struct avl_tree assign_later;
1136
1137 avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
1138
1139 vlist_for_each_element(&interfaces, iface, node) {
1140 if (iface->assignment_length < 48 ||
1141 iface->assignment_length > 64)
1142 continue;
1143
1144 /* Test whether there is a matching class */
1145 if (!list_empty(&iface->assignment_classes)) {
1146 bool found = false;
1147
1148 struct interface_assignment_class *c;
1149 list_for_each_entry(c, &iface->assignment_classes, head) {
1150 if (!strcmp(c->name, prefix->pclass)) {
1151 found = true;
1152 break;
1153 }
1154 }
1155
1156 if (!found)
1157 continue;
1158 }
1159
1160 size_t namelen = strlen(iface->name) + 1;
1161 c = malloc(sizeof(*c) + namelen);
1162 if (!c)
1163 continue;
1164
1165 c->length = iface->assignment_length;
1166 c->assigned = iface->assignment_hint;
1167 c->weight = iface->assignment_weight;
1168 c->addr = in6addr_any;
1169 c->enabled = false;
1170 memcpy(c->name, iface->name, namelen);
1171
1172 /* First process all custom assignments, put all others in later-list */
1173 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
1174 if (c->assigned != -1) {
1175 c->assigned = -1;
1176 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
1177 "of size %hhu for %s, trying other\n", c->length, c->name);
1178 }
1179
1180 entry = calloc(1, sizeof(*entry));
1181 if (!entry) {
1182 free(c);
1183 continue;
1184 }
1185
1186 entry->node.key = c;
1187 avl_insert(&assign_later, &entry->node);
1188 }
1189
1190 if (c->assigned != -1)
1191 assigned_any = true;
1192 }
1193
1194 /* Then try to assign all other + failed custom assignments */
1195 avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
1196 bool assigned = false;
1197
1198 c = (struct device_prefix_assignment *)entry->node.key;
1199 avl_delete(&assign_later, &entry->node);
1200
1201 do {
1202 assigned = interface_prefix_assign(&prefix->assignments, c);
1203 } while (!assigned && ++c->length <= 64);
1204
1205 if (!assigned) {
1206 netifd_log_message(L_WARNING, "Failed to assign subprefix "
1207 "of size %hhu for %s\n", c->length, c->name);
1208 free(c);
1209 } else
1210 assigned_any = true;
1211
1212 free(entry);
1213 }
1214
1215 list_for_each_entry(c, &prefix->assignments, head)
1216 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1217 interface_set_prefix_address(c, prefix, iface, true);
1218
1219 if (!assigned_any)
1220 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
1221 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
1222 }
1223
1224
1225 void interface_refresh_assignments(bool hint)
1226 {
1227 static bool refresh = false;
1228 if (!hint && refresh) {
1229 struct device_prefix *p;
1230 list_for_each_entry(p, &prefixes, head)
1231 interface_update_prefix_assignments(p, true);
1232 }
1233 refresh = hint;
1234 }
1235
1236 void interface_update_prefix_delegation(struct interface_ip_settings *ip)
1237 {
1238 struct device_prefix *prefix;
1239
1240 vlist_for_each_element(&ip->prefix, prefix, node) {
1241 interface_update_prefix_assignments(prefix, !ip->no_delegation);
1242
1243 if (ip->no_delegation) {
1244 if (prefix->head.next)
1245 list_del(&prefix->head);
1246 } else
1247 list_add(&prefix->head, &prefixes);
1248 }
1249 }
1250
1251 static void
1252 interface_update_prefix(struct vlist_tree *tree,
1253 struct vlist_node *node_new,
1254 struct vlist_node *node_old)
1255 {
1256 struct device_prefix *prefix_old, *prefix_new;
1257 prefix_old = container_of(node_old, struct device_prefix, node);
1258 prefix_new = container_of(node_new, struct device_prefix, node);
1259
1260 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
1261 if (tree && (!node_new || !node_old))
1262 ip->iface->updated |= IUF_PREFIX;
1263
1264 struct device_route route;
1265 memset(&route, 0, sizeof(route));
1266 route.flags = DEVADDR_INET6;
1267 route.metric = INT32_MAX;
1268 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
1269 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
1270
1271
1272 struct device_prefix_assignment *c;
1273 struct interface *iface;
1274
1275 if (node_old && node_new) {
1276 /* Move assignments and refresh addresses to update valid times */
1277 list_splice(&prefix_old->assignments, &prefix_new->assignments);
1278
1279 list_for_each_entry(c, &prefix_new->assignments, head)
1280 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1281 interface_set_prefix_address(c, prefix_new, iface, true);
1282
1283 if (prefix_new->preferred_until != prefix_old->preferred_until ||
1284 prefix_new->valid_until != prefix_old->valid_until)
1285 ip->iface->updated |= IUF_PREFIX;
1286 } else if (node_new) {
1287 /* Set null-route to avoid routing loops */
1288 system_add_route(NULL, &route);
1289
1290 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
1291 interface_update_prefix_assignments(prefix_new, true);
1292 } else if (node_old) {
1293 /* Remove null-route */
1294 interface_update_prefix_assignments(prefix_old, false);
1295 system_del_route(NULL, &route);
1296 }
1297
1298 if (node_old) {
1299 if (prefix_old->head.next)
1300 list_del(&prefix_old->head);
1301 free(prefix_old);
1302 }
1303
1304 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1305 list_add(&prefix_new->head, &prefixes);
1306
1307 }
1308
1309 struct device_prefix*
1310 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1311 uint8_t length, time_t valid_until, time_t preferred_until,
1312 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1313 {
1314 union if_addr a = { .in6 = *addr };
1315
1316 if (!pclass)
1317 pclass = (iface) ? iface->name : "local";
1318
1319 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1320 if (!prefix)
1321 return NULL;
1322
1323 clear_if_addr(&a, length);
1324
1325 prefix->length = length;
1326 prefix->addr = a.in6;
1327 prefix->preferred_until = preferred_until;
1328 prefix->valid_until = valid_until;
1329 prefix->iface = iface;
1330 INIT_LIST_HEAD(&prefix->assignments);
1331
1332 if (excl_addr) {
1333 prefix->excl_addr = *excl_addr;
1334 prefix->excl_length = excl_length;
1335 }
1336
1337 strcpy(prefix->pclass, pclass);
1338
1339 if (iface)
1340 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1341 else
1342 interface_update_prefix(NULL, &prefix->node, NULL);
1343
1344 return prefix;
1345 }
1346
1347 void
1348 interface_ip_set_ula_prefix(const char *prefix)
1349 {
1350 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1351 if (prefix)
1352 strncpy(buf, prefix, sizeof(buf) - 1);
1353 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1354
1355 struct in6_addr addr;
1356 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1357 if (ula_prefix) {
1358 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1359 ula_prefix = NULL;
1360 }
1361 return;
1362 }
1363
1364 int length;
1365 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1366 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1367 return;
1368
1369 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1370 ula_prefix->length != length) {
1371 if (ula_prefix)
1372 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1373
1374 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1375 0, 0, NULL, 0, NULL);
1376 }
1377 }
1378
1379 static void
1380 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1381 {
1382 struct dns_server *s;
1383
1384 s = calloc(1, sizeof(*s));
1385 if (!s)
1386 return;
1387
1388 s->af = AF_INET;
1389 if (inet_pton(s->af, str, &s->addr.in))
1390 goto add;
1391
1392 s->af = AF_INET6;
1393 if (inet_pton(s->af, str, &s->addr.in))
1394 goto add;
1395
1396 free(s);
1397 return;
1398
1399 add:
1400 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1401 s->af == AF_INET6 ? '6' : '4', str);
1402 vlist_simple_add(&ip->dns_servers, &s->node);
1403 }
1404
1405 void
1406 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1407 {
1408 struct blob_attr *cur;
1409 int rem;
1410
1411 blobmsg_for_each_attr(cur, list, rem) {
1412 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1413 continue;
1414
1415 if (!blobmsg_check_attr(cur, false))
1416 continue;
1417
1418 interface_add_dns_server(ip, blobmsg_data(cur));
1419 }
1420 }
1421
1422 static void
1423 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1424 {
1425 struct dns_search_domain *s;
1426 int len = strlen(str);
1427
1428 s = calloc(1, sizeof(*s) + len + 1);
1429 if (!s)
1430 return;
1431
1432 D(INTERFACE, "Add DNS search domain: %s\n", str);
1433 memcpy(s->name, str, len);
1434 vlist_simple_add(&ip->dns_search, &s->node);
1435 }
1436
1437 void
1438 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1439 {
1440 struct blob_attr *cur;
1441 int rem;
1442
1443 blobmsg_for_each_attr(cur, list, rem) {
1444 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1445 continue;
1446
1447 if (!blobmsg_check_attr(cur, false))
1448 continue;
1449
1450 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1451 }
1452 }
1453
1454 static void
1455 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1456 {
1457 struct dns_server *s;
1458 struct dns_search_domain *d;
1459 const char *str;
1460 char buf[INET6_ADDRSTRLEN];
1461
1462 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1463 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1464 if (!str)
1465 continue;
1466
1467 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1468 fprintf(f, "nameserver %s%%%s\n", str, dev);
1469 else
1470 fprintf(f, "nameserver %s\n", str);
1471 }
1472
1473 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1474 fprintf(f, "search %s\n", d->name);
1475 }
1476 }
1477
1478 /* Sorting of interface resolver entries : */
1479 /* Primary on interface dns_metric : lowest metric first */
1480 /* Secondary on interface metric : lowest metric first */
1481 /* Finally alphabetical order of interface names */
1482 static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
1483 {
1484 const struct interface *iface1 = k1, *iface2 = k2;
1485
1486 if (iface1->dns_metric != iface2->dns_metric)
1487 return iface1->dns_metric - iface2->dns_metric;
1488
1489 if (iface1->metric != iface2->metric)
1490 return iface1->metric - iface2->metric;
1491
1492 return strcmp(iface1->name, iface2->name);
1493 }
1494
1495 static void
1496 __interface_write_dns_entries(FILE *f, const char *jail)
1497 {
1498 struct interface *iface;
1499 struct {
1500 struct avl_node node;
1501 } *entry, *n_entry;
1502 struct avl_tree resolv_conf_iface_entries;
1503
1504 avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
1505
1506 vlist_for_each_element(&interfaces, iface, node) {
1507 if (iface->state != IFS_UP)
1508 continue;
1509
1510 if (jail && (!iface->jail || strcmp(jail, iface->jail)))
1511 continue;
1512
1513 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1514 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1515 vlist_simple_empty(&iface->config_ip.dns_search) &&
1516 vlist_simple_empty(&iface->config_ip.dns_servers))
1517 continue;
1518
1519 entry = calloc(1, sizeof(*entry));
1520 if (!entry)
1521 continue;
1522
1523 entry->node.key = iface;
1524 avl_insert(&resolv_conf_iface_entries, &entry->node);
1525 }
1526
1527 avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
1528 iface = (struct interface *)entry->node.key;
1529 struct device *dev = iface->l3_dev.dev;
1530
1531 fprintf(f, "# Interface %s\n", iface->name);
1532
1533 write_resolv_conf_entries(f, &iface->config_ip, dev->ifname);
1534
1535 if (!iface->proto_ip.no_dns)
1536 write_resolv_conf_entries(f, &iface->proto_ip, dev->ifname);
1537 }
1538
1539 avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
1540 free(entry);
1541 }
1542
1543 void
1544 interface_write_resolv_conf(const char *jail)
1545 {
1546 size_t plen = (jail ? strlen(jail) + 1 : 0 ) + strlen(resolv_conf) + 1;
1547 char *path = alloca(plen);
1548 char *dpath = alloca(plen);
1549 char *tmppath = alloca(plen + 4);
1550 FILE *f;
1551 uint32_t crcold, crcnew;
1552
1553 if (jail) {
1554 sprintf(path, "/tmp/resolv.conf-%s.d/resolv.conf.auto", jail);
1555 strcpy(dpath, path);
1556 dpath = dirname(dpath);
1557 mkdir(dpath, 0755);
1558 } else {
1559 strcpy(path, resolv_conf);
1560 }
1561
1562 sprintf(tmppath, "%s.tmp", path);
1563 unlink(tmppath);
1564 f = fopen(tmppath, "w+");
1565 if (!f) {
1566 D(INTERFACE, "Failed to open %s for writing\n", path);
1567 return;
1568 }
1569
1570 __interface_write_dns_entries(f, jail);
1571
1572 fflush(f);
1573 rewind(f);
1574 crcnew = crc32_file(f);
1575 fclose(f);
1576
1577 crcold = crcnew + 1;
1578 f = fopen(path, "r");
1579 if (f) {
1580 crcold = crc32_file(f);
1581 fclose(f);
1582 }
1583
1584 if (crcold == crcnew) {
1585 unlink(tmppath);
1586 } else if (rename(tmppath, path) < 0) {
1587 D(INTERFACE, "Failed to replace %s\n", path);
1588 unlink(tmppath);
1589 }
1590 }
1591
1592 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1593 {
1594 struct device_addr *addr;
1595 struct device_route *route;
1596 struct device_neighbor *neighbor;
1597 struct device *dev;
1598 struct interface *iface;
1599
1600 ip->enabled = enabled;
1601 iface = ip->iface;
1602 dev = iface->l3_dev.dev;
1603 if (!dev)
1604 return;
1605
1606 vlist_for_each_element(&ip->addr, addr, node) {
1607 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1608
1609 if (addr->flags & DEVADDR_EXTERNAL)
1610 continue;
1611
1612 if (addr->enabled == enabled)
1613 continue;
1614
1615 if (enabled) {
1616 system_add_address(dev, addr);
1617
1618 addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1619 if (iface->metric || addr->policy_table)
1620 interface_handle_subnet_route(iface, addr, true);
1621
1622 if ((addr->flags & DEVADDR_OFFLINK) && (addr->mask < (v6 ? 128 : 32))) {
1623 struct device_route route;
1624
1625 memset(&route, 0, sizeof(route));
1626 route.flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
1627 route.metric = INT32_MAX;
1628 route.mask = addr->mask;
1629 route.addr = addr->addr;
1630
1631 clear_if_addr(&route.addr, route.mask);
1632
1633 /*
1634 * In case off link is specifed as address property
1635 * add null-route to avoid routing loops
1636 */
1637 system_add_route(NULL, &route);
1638 }
1639
1640 if (addr->policy_table)
1641 interface_add_addr_rules(addr, true);
1642 } else {
1643 interface_handle_subnet_route(iface, addr, false);
1644 system_del_address(dev, addr);
1645
1646 if ((addr->flags & DEVADDR_OFFLINK) && (addr->mask < (v6 ? 128 : 32))) {
1647 struct device_route route;
1648
1649 memset(&route, 0, sizeof(route));
1650 route.flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
1651 route.metric = INT32_MAX;
1652 route.mask = addr->mask;
1653 route.addr = addr->addr;
1654
1655 clear_if_addr(&route.addr, route.mask);
1656
1657 /* Delete null-route */
1658 system_del_route(NULL, &route);
1659 }
1660
1661 if (addr->policy_table)
1662 interface_add_addr_rules(addr, false);
1663 }
1664 addr->enabled = enabled;
1665 }
1666
1667 vlist_for_each_element(&ip->route, route, node) {
1668 bool _enabled = enabled;
1669
1670 if (route->flags & DEVADDR_EXTERNAL)
1671 continue;
1672
1673 if (!enable_route(ip, route))
1674 _enabled = false;
1675 if (route->enabled == _enabled)
1676 continue;
1677
1678 if (_enabled) {
1679 interface_set_route_info(ip->iface, route);
1680
1681 if (system_add_route(dev, route))
1682 route->failed = true;
1683 } else
1684 system_del_route(dev, route);
1685
1686 route->enabled = _enabled;
1687 }
1688
1689 vlist_for_each_element(&ip->neighbor, neighbor, node) {
1690 if (neighbor->enabled == enabled)
1691 continue;
1692
1693 if (enabled) {
1694 if(system_add_neighbor(dev, neighbor))
1695 neighbor->failed = true;
1696 } else
1697 system_del_neighbor(dev, neighbor);
1698
1699 neighbor->enabled = enabled;
1700 }
1701
1702 struct device_prefix *c;
1703 struct device_prefix_assignment *a;
1704 list_for_each_entry(c, &prefixes, head)
1705 list_for_each_entry(a, &c->assignments, head)
1706 if (!strcmp(a->name, ip->iface->name))
1707 interface_set_prefix_address(a, c, ip->iface, enabled);
1708
1709 if (ip->iface->policy_rules_set != enabled &&
1710 ip->iface->l3_dev.dev) {
1711 set_ip_lo_policy(enabled, true, ip->iface);
1712 set_ip_lo_policy(enabled, false, ip->iface);
1713
1714 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1715 NULL, 0, 0, ip->iface, "failed_policy", true);
1716 ip->iface->policy_rules_set = enabled;
1717 }
1718 }
1719
1720 void
1721 interface_ip_update_start(struct interface_ip_settings *ip)
1722 {
1723 if (ip != &ip->iface->config_ip) {
1724 vlist_simple_update(&ip->dns_servers);
1725 vlist_simple_update(&ip->dns_search);
1726 }
1727 vlist_update(&ip->route);
1728 vlist_update(&ip->addr);
1729 vlist_update(&ip->prefix);
1730 vlist_update(&ip->neighbor);
1731 }
1732
1733 void
1734 interface_ip_update_complete(struct interface_ip_settings *ip)
1735 {
1736 vlist_simple_flush(&ip->dns_servers);
1737 vlist_simple_flush(&ip->dns_search);
1738 vlist_flush(&ip->route);
1739 vlist_flush(&ip->addr);
1740 vlist_flush(&ip->prefix);
1741 vlist_flush(&ip->neighbor);
1742 interface_write_resolv_conf(ip->iface->jail);
1743 }
1744
1745 void
1746 interface_ip_flush(struct interface_ip_settings *ip)
1747 {
1748 if (ip == &ip->iface->proto_ip)
1749 vlist_flush_all(&ip->iface->host_routes);
1750 vlist_simple_flush_all(&ip->dns_servers);
1751 vlist_simple_flush_all(&ip->dns_search);
1752 vlist_flush_all(&ip->route);
1753 vlist_flush_all(&ip->addr);
1754 vlist_flush_all(&ip->neighbor);
1755 vlist_flush_all(&ip->prefix);
1756 }
1757
1758 static void
1759 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1760 {
1761 ip->iface = iface;
1762 ip->enabled = true;
1763 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1764 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1765 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1766 vlist_init(&ip->neighbor, neighbor_cmp, interface_update_proto_neighbor);
1767 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1768 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1769 }
1770
1771 void
1772 interface_ip_init(struct interface *iface)
1773 {
1774 __interface_ip_init(&iface->proto_ip, iface);
1775 __interface_ip_init(&iface->config_ip, iface);
1776 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1777 }
1778
1779 static void
1780 interface_ip_valid_until_handler(struct uloop_timeout *t)
1781 {
1782 time_t now = system_get_rtime();
1783 struct interface *iface;
1784 vlist_for_each_element(&interfaces, iface, node) {
1785 if (iface->state != IFS_UP)
1786 continue;
1787
1788 struct device_addr *addr, *addrp;
1789 struct device_route *route, *routep;
1790 struct device_prefix *pref, *prefp;
1791
1792 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1793 if (addr->valid_until && addr->valid_until < now)
1794 vlist_delete(&iface->proto_ip.addr, &addr->node);
1795
1796 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1797 if (route->valid_until && route->valid_until < now)
1798 vlist_delete(&iface->proto_ip.route, &route->node);
1799
1800 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1801 if (pref->valid_until && pref->valid_until < now)
1802 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1803
1804 }
1805
1806 uloop_timeout_set(t, 1000);
1807 }
1808
1809 static void __init
1810 interface_ip_init_worker(void)
1811 {
1812 valid_until_timeout.cb = interface_ip_valid_until_handler;
1813 uloop_timeout_set(&valid_until_timeout, 1000);
1814 }
OpenWrt Network interface configuration daemon