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