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interface: proto_ip: order by address index first
[project/netifd.git] / interface-ip.c
1 /*
2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2012 Steven Barth <steven@midlink.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15 #include <string.h>
16 #include <stdlib.h>
17 #include <stdio.h>
18 #include <libgen.h>
19 #include <sys/stat.h>
20
21 #include <limits.h>
22 #include <arpa/inet.h>
23 #include <netinet/in.h>
24
25 #ifdef linux
26 #include <netinet/ether.h>
27 #else
28 #include <net/ethernet.h>
29 #endif
30
31 #include "netifd.h"
32 #include "device.h"
33 #include "interface.h"
34 #include "interface-ip.h"
35 #include "proto.h"
36 #include "ubus.h"
37 #include "system.h"
38
39 enum {
40 ROUTE_INTERFACE,
41 ROUTE_TARGET,
42 ROUTE_MASK,
43 ROUTE_GATEWAY,
44 ROUTE_METRIC,
45 ROUTE_MTU,
46 ROUTE_VALID,
47 ROUTE_TABLE,
48 ROUTE_SOURCE,
49 ROUTE_ONLINK,
50 ROUTE_TYPE,
51 ROUTE_PROTO,
52 __ROUTE_MAX
53 };
54
55 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
56 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
57 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
58 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
59 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
60 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
61 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
62 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
63 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
64 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
65 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
66 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
67 [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
68 };
69
70 const struct uci_blob_param_list route_attr_list = {
71 .n_params = __ROUTE_MAX,
72 .params = route_attr,
73 };
74
75 enum {
76 NEIGHBOR_INTERFACE,
77 NEIGHBOR_ADDRESS,
78 NEIGHBOR_MAC,
79 NEIGHBOR_PROXY,
80 NEIGHBOR_ROUTER,
81 __NEIGHBOR_MAX
82 };
83
84 static const struct blobmsg_policy neighbor_attr[__NEIGHBOR_MAX]={
85 [NEIGHBOR_INTERFACE]= { .name = "interface", .type = BLOBMSG_TYPE_STRING},
86 [NEIGHBOR_ADDRESS]= { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING},
87 [NEIGHBOR_MAC]= { .name = "mac", .type = BLOBMSG_TYPE_STRING},
88 [NEIGHBOR_PROXY]= { .name = "proxy", .type = BLOBMSG_TYPE_BOOL},
89 [NEIGHBOR_ROUTER]= {.name = "router", .type = BLOBMSG_TYPE_BOOL},
90 };
91
92 const struct uci_blob_param_list neighbor_attr_list = {
93 .n_params = __NEIGHBOR_MAX,
94 .params = neighbor_attr,
95 };
96
97
98 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
99 static struct device_prefix *ula_prefix = NULL;
100 static struct uloop_timeout valid_until_timeout;
101
102
103 static void
104 clear_if_addr(union if_addr *a, int mask)
105 {
106 int m_bytes = (mask + 7) / 8;
107 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
108 uint8_t *p = (uint8_t *) a;
109
110 if (m_bytes < sizeof(*a))
111 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
112
113 p[m_bytes - 1] &= ~m_clear;
114 }
115
116 static bool
117 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
118 {
119 union if_addr *p1, *p2;
120
121 p1 = alloca(sizeof(*a1));
122 p2 = alloca(sizeof(*a2));
123
124 memcpy(p1, a1, sizeof(*a1));
125 clear_if_addr(p1, mask);
126 memcpy(p2, a2, sizeof(*a2));
127 clear_if_addr(p2, mask);
128
129 return !memcmp(p1, p2, sizeof(*p1));
130 }
131
132 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
133 const union if_addr *addr, uint8_t mask, unsigned int table,
134 struct interface *in_iface, const char *action, bool src)
135 {
136 struct iprule rule = {
137 .flags = IPRULE_PRIORITY,
138 .priority = priority
139 };
140
141 if (addr) {
142 if (src) {
143 rule.flags |= IPRULE_SRC;
144 rule.src_addr = *addr;
145 rule.src_mask = mask;
146 } else {
147 rule.flags |= IPRULE_DEST;
148 rule.dest_addr = *addr;
149 rule.dest_mask = mask;
150 }
151 }
152
153 if (table) {
154 rule.flags |= IPRULE_LOOKUP;
155 rule.lookup = table;
156
157 if (!rule.lookup)
158 return 0;
159 } else if (action) {
160 rule.flags |= IPRULE_ACTION;
161 system_resolve_iprule_action(action, &rule.action);
162 }
163
164 if (in_iface && in_iface->l3_dev.dev) {
165 rule.flags |= IPRULE_IN;
166 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
167 }
168
169 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
170
171 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
172 }
173
174 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
175 {
176 struct iprule rule = {
177 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
178 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
179 .lookup = (v6) ? iface->ip6table : iface->ip4table,
180 .in_dev = "lo"
181 };
182
183 if (!rule.lookup)
184 return 0;
185
186 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
187
188 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
189 }
190
191 static bool
192 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
193 {
194 struct device_addr *addr;
195
196 vlist_for_each_element(&ip->addr, addr, node) {
197 if (!addr->enabled)
198 continue;
199
200 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
201 continue;
202
203 if (((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
204 addr->point_to_point && a->in.s_addr == addr->point_to_point)
205 return true;
206
207 /* Handle offlink addresses correctly */
208 unsigned int mask = addr->mask;
209 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
210 (addr->flags & DEVADDR_OFFLINK))
211 mask = 128;
212
213 if (!match_if_addr(&addr->addr, a, mask))
214 continue;
215
216 return true;
217 }
218
219 return false;
220 }
221
222 static void
223 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
224 bool v6, struct device_route **res)
225 {
226 struct device_route *route;
227
228 vlist_for_each_element(&ip->route, route, node) {
229 if (!route->enabled)
230 continue;
231
232 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
233 continue;
234
235 if (!match_if_addr(&route->addr, a, route->mask))
236 continue;
237
238 if (route->flags & DEVROUTE_TABLE)
239 continue;
240
241 if (!*res || route->mask > (*res)->mask)
242 *res = route;
243 }
244 }
245
246 static bool
247 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
248 {
249 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
250 __find_ip_addr_target(&iface->config_ip, a, v6);
251 }
252
253 static void
254 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
255 bool v6, struct device_route **route)
256 {
257 __find_ip_route_target(&iface->proto_ip, a, v6, route);
258 __find_ip_route_target(&iface->config_ip, a, v6, route);
259 }
260
261 struct interface *
262 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
263 {
264 struct device_route *route, *r_next = NULL;
265 bool defaultroute_target = false;
266 union if_addr addr_zero;
267 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
268
269 memset(&addr_zero, 0, sizeof(addr_zero));
270 if (memcmp(&addr_zero, addr, addrsize) == 0)
271 defaultroute_target = true;
272
273 if (iface) {
274 /* look for locally addressable target first */
275 if (interface_ip_find_addr_target(iface, addr, v6))
276 return iface;
277
278 /* do not stop at the first route, let the lookup compare
279 * masks to find the best match */
280 interface_ip_find_route_target(iface, addr, v6, &r_next);
281 } else {
282 vlist_for_each_element(&interfaces, iface, node) {
283 /* look for locally addressable target first */
284 if (interface_ip_find_addr_target(iface, addr, v6))
285 return iface;
286
287 /* do not stop at the first route, let the lookup compare
288 * masks to find the best match */
289 interface_ip_find_route_target(iface, addr, v6, &r_next);
290 }
291 }
292
293 if (!r_next)
294 return NULL;
295
296 iface = r_next->iface;
297 if (defaultroute_target)
298 return iface;
299
300 route = calloc(1, sizeof(*route));
301 if (!route)
302 return NULL;
303
304 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
305 route->mask = v6 ? 128 : 32;
306 memcpy(&route->addr, addr, addrsize);
307 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
308 route->mtu = r_next->mtu;
309 route->metric = r_next->metric;
310 route->table = r_next->table;
311 route->iface = iface;
312 vlist_add(&iface->host_routes, &route->node, route);
313
314 return iface;
315 }
316
317 static void
318 interface_set_route_info(struct interface *iface, struct device_route *route)
319 {
320 bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
321
322 if (!iface)
323 return;
324
325 if (!(route->flags & DEVROUTE_METRIC))
326 route->metric = iface->metric;
327
328 if (!(route->flags & DEVROUTE_TABLE)) {
329 route->table = (v6) ? iface->ip6table : iface->ip4table;
330 if (route->table)
331 route->flags |= DEVROUTE_SRCTABLE;
332 }
333 }
334
335 void
336 interface_ip_add_neighbor(struct interface *iface, struct blob_attr *attr, bool v6)
337 {
338 struct interface_ip_settings *ip;
339 struct blob_attr *tb[__NEIGHBOR_MAX], *cur;
340 struct device_neighbor *neighbor;
341 int af = v6 ? AF_INET6: AF_INET;
342 struct ether_addr *ea;
343
344 blobmsg_parse(neighbor_attr, __NEIGHBOR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
345
346 if (!iface) {
347 if ((cur = tb[NEIGHBOR_INTERFACE]) == NULL)
348 return;
349
350 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
351
352 if (!iface)
353 return;
354
355 ip = &iface->config_ip;
356 } else
357 ip = &iface->proto_ip;
358
359 neighbor = calloc(1,sizeof(*neighbor));
360 if (!neighbor)
361 return;
362
363 neighbor->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
364
365 if ((cur = tb[NEIGHBOR_ADDRESS]) != NULL){
366 if (!inet_pton(af, blobmsg_data(cur), &neighbor->addr))
367 goto error;
368 } else
369 goto error;
370
371 if ((cur = tb[NEIGHBOR_MAC]) != NULL) {
372 neighbor->flags |= DEVNEIGH_MAC;
373 ea = ether_aton(blobmsg_data(cur));
374 if (!ea)
375 goto error;
376
377 memcpy(neighbor->macaddr, ea, 6);
378 }
379
380 if ((cur = tb[NEIGHBOR_PROXY]) != NULL)
381 neighbor->proxy = blobmsg_get_bool(cur);
382
383 if ((cur = tb[NEIGHBOR_ROUTER]) != NULL)
384 neighbor->router = blobmsg_get_bool(cur);
385
386 vlist_add(&ip->neighbor, &neighbor->node, neighbor);
387 return;
388
389 error:
390 free(neighbor);
391 }
392
393 void
394 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
395 {
396 struct interface_ip_settings *ip;
397 struct blob_attr *tb[__ROUTE_MAX], *cur;
398 struct device_route *route;
399 int af = v6 ? AF_INET6 : AF_INET;
400
401 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
402
403 if (!iface) {
404 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
405 return;
406
407 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
408 if (!iface)
409 return;
410
411 ip = &iface->config_ip;
412 } else {
413 ip = &iface->proto_ip;
414 }
415
416 route = calloc(1, sizeof(*route));
417 if (!route)
418 return;
419
420 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
421 route->mask = v6 ? 128 : 32;
422 if ((cur = tb[ROUTE_MASK]) != NULL) {
423 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
424 if (route->mask > (v6 ? 128 : 32))
425 goto error;
426 }
427
428 if ((cur = tb[ROUTE_TARGET]) != NULL) {
429 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
430 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
431 goto error;
432 }
433 }
434
435 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
436 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
437 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
438 goto error;
439 }
440 }
441
442 if ((cur = tb[ROUTE_METRIC]) != NULL) {
443 route->metric = blobmsg_get_u32(cur);
444 route->flags |= DEVROUTE_METRIC;
445 }
446
447 if ((cur = tb[ROUTE_MTU]) != NULL) {
448 route->mtu = blobmsg_get_u32(cur);
449 route->flags |= DEVROUTE_MTU;
450 }
451
452 /* Use source-based routing */
453 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
454 char *saveptr, *source = alloca(blobmsg_data_len(cur));
455 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
456
457 const char *addr = strtok_r(source, "/", &saveptr);
458 const char *mask = strtok_r(NULL, "/", &saveptr);
459
460 if (!addr || inet_pton(af, addr, &route->source) < 1) {
461 DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
462 goto error;
463 }
464
465 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
466 }
467
468 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
469 route->flags |= DEVROUTE_ONLINK;
470
471 if ((cur = tb[ROUTE_TABLE]) != NULL) {
472 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
473 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
474 goto error;
475 }
476
477 /* only set the table flag if not using the main (default) table */
478 if (system_is_default_rt_table(route->table))
479 route->table = 0;
480
481 if (route->table)
482 route->flags |= DEVROUTE_TABLE;
483 }
484
485 if ((cur = tb[ROUTE_VALID]) != NULL) {
486 int64_t valid = blobmsg_get_u32(cur);
487 int64_t valid_until = valid + (int64_t)system_get_rtime();
488 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) /* Catch overflow */
489 route->valid_until = valid_until;
490 }
491
492 if ((cur = tb[ROUTE_TYPE]) != NULL) {
493 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
494 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
495 goto error;
496 }
497 route->flags |= DEVROUTE_TYPE;
498 }
499
500 if ((cur = tb[ROUTE_PROTO]) != NULL) {
501 if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
502 DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
503 goto error;
504 }
505 route->flags |= DEVROUTE_PROTO;
506 }
507
508 interface_set_route_info(iface, route);
509 vlist_add(&ip->route, &route->node, route);
510 return;
511
512 error:
513 free(route);
514 }
515
516 static int
517 addr_cmp(const void *k1, const void *k2, void *ptr)
518 {
519 const struct device_addr *a1 = k1;
520 const struct device_addr *a2 = k2;
521 const int cmp_offset = offsetof(struct device_addr, flags);
522 const int cmp_size = sizeof(struct device_addr) - cmp_offset;
523
524 if (a1->index != a2->index)
525 return a1->index - a2->index;
526 return memcmp(k1+cmp_offset, k2+cmp_offset, cmp_size);
527 }
528
529 static int
530 neighbor_cmp(const void *k1, const void *k2, void *ptr)
531 {
532 const struct device_neighbor *n1 = k1, *n2 = k2;
533
534 return memcmp(&n1->addr, &n2->addr, sizeof(n2->addr));
535 }
536
537 static int
538 route_cmp(const void *k1, const void *k2, void *ptr)
539 {
540 const struct device_route *r1 = k1, *r2 = k2;
541
542 if (r1->mask != r2->mask)
543 return r2->mask - r1->mask;
544
545 if (r1->metric != r2->metric)
546 return r1->metric - r2->metric;
547
548 if (r1->flags != r2->flags)
549 return r2->flags - r1->flags;
550
551 if (r1->sourcemask != r2->sourcemask)
552 return r1->sourcemask - r2->sourcemask;
553
554 if (r1->table != r2->table)
555 return r1->table - r2->table;
556
557 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
558 if (maskcmp)
559 return maskcmp;
560
561 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
562 }
563
564 static int
565 prefix_cmp(const void *k1, const void *k2, void *ptr)
566 {
567 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
568 offsetof(struct device_prefix, addr));
569 }
570
571 static void
572 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
573 {
574 struct device *dev = iface->l3_dev.dev;
575 struct device_route *r = &addr->subnet;
576
577 if (addr->flags & DEVADDR_OFFLINK)
578 return;
579
580 if (!add) {
581 if (!addr->subnet.iface)
582 return;
583
584 system_del_route(dev, r);
585 memset(r, 0, sizeof(*r));
586 return;
587 }
588
589 r->iface = iface;
590 r->flags = addr->flags;
591 r->mask = addr->mask;
592 memcpy(&r->addr, &addr->addr, sizeof(r->addr));
593 clear_if_addr(&r->addr, r->mask);
594
595 if (!system_resolve_rt_proto("kernel", &r->proto))
596 return;
597
598 r->flags |= DEVROUTE_PROTO;
599 system_del_route(dev, r);
600
601 r->flags &= ~DEVROUTE_PROTO;
602 interface_set_route_info(iface, r);
603
604 system_add_route(dev, r);
605 }
606
607 static void
608 interface_add_addr_rules(struct device_addr *addr, bool enabled)
609 {
610 bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
611
612 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
613 (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
614 true);
615 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
616 &addr->addr, addr->mask, addr->policy_table, NULL,
617 NULL, false);
618 }
619
620 static void
621 interface_update_proto_addr(struct vlist_tree *tree,
622 struct vlist_node *node_new,
623 struct vlist_node *node_old)
624 {
625 struct interface_ip_settings *ip;
626 struct interface *iface;
627 struct device *dev;
628 struct device_addr *a_new = NULL, *a_old = NULL;
629 bool replace = false;
630 bool keep = false;
631 bool v6 = false;
632
633 ip = container_of(tree, struct interface_ip_settings, addr);
634 iface = ip->iface;
635 dev = iface->l3_dev.dev;
636
637 if (!node_new || !node_old)
638 iface->updated |= IUF_ADDRESS;
639
640 if (node_new) {
641 a_new = container_of(node_new, struct device_addr, node);
642
643 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
644 !a_new->broadcast) {
645
646 /* /31 and /32 addressing need 255.255.255.255
647 * as broadcast address. */
648 if (a_new->mask >= 31) {
649 a_new->broadcast = (uint32_t) ~0;
650 } else {
651 uint32_t mask = ~0;
652 uint32_t *a = (uint32_t *) &a_new->addr;
653
654 mask >>= a_new->mask;
655 a_new->broadcast = *a | htonl(mask);
656 }
657 }
658 }
659
660 if (node_old)
661 a_old = container_of(node_old, struct device_addr, node);
662
663 if (a_new && a_old) {
664 keep = true;
665
666 if (a_old->flags != a_new->flags || a_old->failed)
667 keep = false;
668
669 if (a_old->valid_until != a_new->valid_until ||
670 a_old->preferred_until != a_new->preferred_until)
671 replace = true;
672
673 if (((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
674 (a_new->broadcast != a_old->broadcast ||
675 a_new->point_to_point != a_old->point_to_point))
676 keep = false;
677 }
678
679 if (node_old) {
680 if (a_old->enabled && !keep) {
681 /*
682 * This is needed for source routing to work correctly. If a device
683 * has two connections to a network using the same subnet, adding
684 * only the network-rule will cause packets to be routed through the
685 * first matching network (source IP matches both masks)
686 */
687 if (a_old->policy_table)
688 interface_add_addr_rules(a_old, false);
689
690 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
691 interface_handle_subnet_route(iface, a_old, false);
692 system_del_address(dev, a_old);
693 }
694 }
695 free(a_old->pclass);
696 free(a_old);
697 }
698
699 if (node_new) {
700 a_new->enabled = true;
701
702 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
703 v6 = true;
704
705 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
706
707 if (!keep || replace) {
708 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
709 if (system_add_address(dev, a_new))
710 a_new->failed = true;
711
712 if (iface->metric || a_new->policy_table)
713 interface_handle_subnet_route(iface, a_new, true);
714 }
715
716 if (!keep) {
717 if (a_new->policy_table)
718 interface_add_addr_rules(a_new, true);
719 }
720 }
721 }
722 }
723
724 static bool
725 enable_route(struct interface_ip_settings *ip, struct device_route *route)
726 {
727 if (ip->no_defaultroute && !route->mask)
728 return false;
729
730 return ip->enabled;
731 }
732
733 static void
734 interface_update_proto_neighbor(struct vlist_tree *tree,
735 struct vlist_node * node_new,
736 struct vlist_node *node_old)
737 {
738 struct device *dev;
739 struct device_neighbor *neighbor_old, *neighbor_new;
740 struct interface_ip_settings *ip;
741 bool keep = false;
742
743 ip = container_of(tree, struct interface_ip_settings, neighbor);
744 dev = ip->iface->l3_dev.dev;
745
746 neighbor_old = container_of(node_old, struct device_neighbor, node);
747 neighbor_new = container_of(node_new, struct device_neighbor, node);
748
749 if (node_old && node_new) {
750 keep = (!memcmp(neighbor_old->macaddr, neighbor_new->macaddr, sizeof(neighbor_old->macaddr)) &&
751 (neighbor_old->proxy == neighbor_new->proxy) &&
752 (neighbor_old->router == neighbor_new->router));
753 }
754
755 if (node_old) {
756 if (!keep && neighbor_old->enabled)
757 system_del_neighbor(dev, neighbor_old);
758
759 free(neighbor_old);
760 }
761
762 if (node_new) {
763 if (!keep && ip->enabled)
764 if (system_add_neighbor(dev, neighbor_new))
765 neighbor_new->failed = true;
766
767 neighbor_new->enabled = ip->enabled;
768 }
769 }
770
771 static void
772 interface_update_proto_route(struct vlist_tree *tree,
773 struct vlist_node *node_new,
774 struct vlist_node *node_old)
775 {
776 struct interface_ip_settings *ip;
777 struct interface *iface;
778 struct device *dev;
779 struct device_route *route_old, *route_new;
780 bool keep = false;
781
782 ip = container_of(tree, struct interface_ip_settings, route);
783 iface = ip->iface;
784 dev = iface->l3_dev.dev;
785
786 if (!node_new || !node_old)
787 iface->updated |= IUF_ROUTE;
788
789 route_old = container_of(node_old, struct device_route, node);
790 route_new = container_of(node_new, struct device_route, node);
791
792 if (node_old && node_new)
793 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
794 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
795 (route_old->proto == route_new->proto) && !route_old->failed;
796
797 if (node_old) {
798 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
799 system_del_route(dev, route_old);
800
801 free(route_old);
802 }
803
804 if (node_new) {
805 bool _enabled = enable_route(ip, route_new);
806
807 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
808 if (system_add_route(dev, route_new))
809 route_new->failed = true;
810
811 route_new->iface = iface;
812 route_new->enabled = _enabled;
813 }
814 }
815
816 static void
817 interface_update_host_route(struct vlist_tree *tree,
818 struct vlist_node *node_new,
819 struct vlist_node *node_old)
820 {
821 struct interface *iface;
822 struct device *dev;
823 struct device_route *route_old, *route_new;
824
825 iface = container_of(tree, struct interface, host_routes);
826 dev = iface->l3_dev.dev;
827
828 route_old = container_of(node_old, struct device_route, node);
829 route_new = container_of(node_new, struct device_route, node);
830
831 if (node_old) {
832 system_del_route(dev, route_old);
833 free(route_old);
834 }
835
836 if (node_new) {
837 if (system_add_route(dev, route_new))
838 route_new->failed = true;
839 }
840 }
841
842 static void
843 random_ifaceid(struct in6_addr *addr)
844 {
845 static bool initialized = false;
846 struct timeval t;
847
848 if (!initialized) {
849 long int seed = 0;
850 gettimeofday(&t, NULL);
851 seed = t.tv_sec ^ t.tv_usec ^ getpid();
852 srand48(seed);
853 initialized = true;
854 }
855 addr->s6_addr32[2] = (uint32_t)mrand48();
856 addr->s6_addr32[3] = (uint32_t)mrand48();
857 }
858
859 static bool
860 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
861 {
862 struct device_settings st;
863
864 device_merge_settings(iface->l3_dev.dev, &st);
865
866 if (!(st.flags & DEV_OPT_MACADDR))
867 return false;
868
869 /* get mac address */
870 uint8_t *ifaceid = addr->s6_addr + 8;
871 memcpy(ifaceid, st.macaddr, 3);
872 memcpy(ifaceid + 5, st.macaddr + 3, 3);
873 ifaceid[3] = 0xff;
874 ifaceid[4] = 0xfe;
875 ifaceid[0] ^= 0x02;
876
877 return true;
878 }
879
880 static bool
881 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
882 {
883 bool ret = true;
884
885 /* generate new iface id */
886 switch (iface->assignment_iface_id_selection) {
887 case IFID_FIXED:
888 /* fixed */
889 /* copy host part from assignment_fixed_iface_id */
890 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
891 break;
892 case IFID_RANDOM:
893 /* randomize last 64 bits */
894 random_ifaceid(addr);
895 break;
896 case IFID_EUI64:
897 /* eui64 */
898 ret = eui64_ifaceid(iface, addr);
899 break;
900 default:
901 ret = false;
902 break;
903 }
904 return ret;
905 }
906
907 static void
908 interface_set_prefix_address(struct device_prefix_assignment *assignment,
909 const struct device_prefix *prefix, struct interface *iface, bool add)
910 {
911 const struct interface *uplink = prefix->iface;
912 if (!iface->l3_dev.dev)
913 return;
914
915 struct device *l3_downlink = iface->l3_dev.dev;
916
917 struct device_addr addr;
918 struct device_route route;
919 memset(&addr, 0, sizeof(addr));
920 memset(&route, 0, sizeof(route));
921
922 addr.addr.in6 = assignment->addr;
923 addr.mask = assignment->length;
924 addr.flags = DEVADDR_INET6;
925 addr.preferred_until = prefix->preferred_until;
926 addr.valid_until = prefix->valid_until;
927
928 route.flags = DEVADDR_INET6;
929 route.mask = addr.mask < 64 ? 64 : addr.mask;
930 route.addr = addr.addr;
931
932 if (!add && assignment->enabled) {
933 time_t now = system_get_rtime();
934
935 addr.preferred_until = now;
936 if (!addr.valid_until || addr.valid_until - now > 7200)
937 addr.valid_until = now + 7200;
938
939 if (iface->ip6table)
940 set_ip_source_policy(false, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
941 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
942
943 if (prefix->iface) {
944 if (prefix->iface->ip6table)
945 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
946 addr.mask, prefix->iface->ip6table, iface, NULL, true);
947
948 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
949 addr.mask, 0, iface, "unreachable", true);
950 }
951
952 clear_if_addr(&route.addr, route.mask);
953 interface_set_route_info(iface, &route);
954
955 system_del_route(l3_downlink, &route);
956 system_add_address(l3_downlink, &addr);
957
958 assignment->addr = in6addr_any;
959 assignment->enabled = false;
960 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
961 if (IN6_IS_ADDR_UNSPECIFIED(&addr.addr.in6)) {
962 addr.addr.in6 = prefix->addr;
963 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
964 if (!generate_ifaceid(iface, &addr.addr.in6))
965 return;
966
967 assignment->addr = addr.addr.in6;
968 route.addr = addr.addr;
969 }
970
971 addr.flags |= DEVADDR_OFFLINK;
972 if (system_add_address(l3_downlink, &addr))
973 return;
974
975 if (!assignment->enabled) {
976 if (iface->ip6table)
977 set_ip_source_policy(true, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
978 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
979
980 if (prefix->iface) {
981 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
982 addr.mask, 0, iface, "unreachable", true);
983
984 if (prefix->iface->ip6table)
985 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
986 addr.mask, prefix->iface->ip6table, iface, NULL, true);
987 }
988 }
989
990 clear_if_addr(&route.addr, route.mask);
991 interface_set_route_info(iface, &route);
992
993 system_add_route(l3_downlink, &route);
994
995 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
996 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
997 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
998
999 if (mtu > 0 && mtu_old != mtu) {
1000 if (system_update_ipv6_mtu(l3_downlink, mtu) < 0 && mtu < mtu_old)
1001 netifd_log_message(L_WARNING, "Failed to set IPv6 mtu to %d "
1002 "on interface '%s'\n", mtu, iface->name);
1003 }
1004 }
1005
1006 assignment->enabled = true;
1007 }
1008 }
1009
1010 static bool interface_prefix_assign(struct list_head *list,
1011 struct device_prefix_assignment *assign)
1012 {
1013 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
1014 struct device_prefix_assignment *c;
1015 list_for_each_entry(c, list, head) {
1016 if (assign->assigned != -1) {
1017 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
1018 list_add_tail(&assign->head, &c->head);
1019 return true;
1020 }
1021 } else if (assign->assigned == -1) {
1022 current = (current + asize) & (~asize);
1023 if (current + asize < c->assigned) {
1024 assign->assigned = current;
1025 list_add_tail(&assign->head, &c->head);
1026 return true;
1027 }
1028 }
1029 current = (c->assigned + (1 << (64 - c->length)));
1030 }
1031 return false;
1032 }
1033
1034 /*
1035 * Sorting of assignment entries:
1036 * Primary on assignment length: smallest assignment first
1037 * Secondary on assignment weight: highest weight first
1038 * Finally alphabetical order of interface names
1039 */
1040 static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
1041 {
1042 const struct device_prefix_assignment *a1 = k1, *a2 = k2;
1043
1044 if (a1->length != a2->length)
1045 return a1->length - a2->length;
1046
1047 if (a1->weight != a2->weight)
1048 return a2->weight - a1->weight;
1049
1050 return strcmp(a1->name, a2->name);
1051 }
1052
1053 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
1054 {
1055 struct device_prefix_assignment *c;
1056 struct interface *iface;
1057
1058 /* Delete all assignments */
1059 while (!list_empty(&prefix->assignments)) {
1060 c = list_first_entry(&prefix->assignments,
1061 struct device_prefix_assignment, head);
1062 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1063 interface_set_prefix_address(c, prefix, iface, false);
1064 list_del(&c->head);
1065 free(c);
1066 }
1067
1068 if (!setup)
1069 return;
1070
1071 /* End-of-assignment sentinel */
1072 c = malloc(sizeof(*c) + 1);
1073 if (!c)
1074 return;
1075
1076 c->assigned = 1 << (64 - prefix->length);
1077 c->length = 64;
1078 c->name[0] = 0;
1079 c->addr = in6addr_any;
1080 list_add(&c->head, &prefix->assignments);
1081
1082 /* Excluded prefix */
1083 if (prefix->excl_length > 0) {
1084 const char name[] = "!excluded";
1085 c = malloc(sizeof(*c) + sizeof(name));
1086 if (c) {
1087 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
1088 ((1 << (64 - prefix->length)) - 1);
1089 c->length = prefix->excl_length;
1090 c->addr = in6addr_any;
1091 memcpy(c->name, name, sizeof(name));
1092 list_add(&c->head, &prefix->assignments);
1093 }
1094 }
1095
1096 bool assigned_any = false;
1097 struct {
1098 struct avl_node node;
1099 } *entry, *n_entry;
1100 struct avl_tree assign_later;
1101
1102 avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
1103
1104 vlist_for_each_element(&interfaces, iface, node) {
1105 if (iface->assignment_length < 48 ||
1106 iface->assignment_length > 64)
1107 continue;
1108
1109 /* Test whether there is a matching class */
1110 if (!list_empty(&iface->assignment_classes)) {
1111 bool found = false;
1112
1113 struct interface_assignment_class *c;
1114 list_for_each_entry(c, &iface->assignment_classes, head) {
1115 if (!strcmp(c->name, prefix->pclass)) {
1116 found = true;
1117 break;
1118 }
1119 }
1120
1121 if (!found)
1122 continue;
1123 }
1124
1125 size_t namelen = strlen(iface->name) + 1;
1126 c = malloc(sizeof(*c) + namelen);
1127 if (!c)
1128 continue;
1129
1130 c->length = iface->assignment_length;
1131 c->assigned = iface->assignment_hint;
1132 c->weight = iface->assignment_weight;
1133 c->addr = in6addr_any;
1134 c->enabled = false;
1135 memcpy(c->name, iface->name, namelen);
1136
1137 /* First process all custom assignments, put all others in later-list */
1138 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
1139 if (c->assigned != -1) {
1140 c->assigned = -1;
1141 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
1142 "of size %hhu for %s, trying other\n", c->length, c->name);
1143 }
1144
1145 entry = calloc(1, sizeof(*entry));
1146 if (!entry) {
1147 free(c);
1148 continue;
1149 }
1150
1151 entry->node.key = c;
1152 avl_insert(&assign_later, &entry->node);
1153 }
1154
1155 if (c->assigned != -1)
1156 assigned_any = true;
1157 }
1158
1159 /* Then try to assign all other + failed custom assignments */
1160 avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
1161 bool assigned = false;
1162
1163 c = (struct device_prefix_assignment *)entry->node.key;
1164 avl_delete(&assign_later, &entry->node);
1165
1166 do {
1167 assigned = interface_prefix_assign(&prefix->assignments, c);
1168 } while (!assigned && ++c->length <= 64);
1169
1170 if (!assigned) {
1171 netifd_log_message(L_WARNING, "Failed to assign subprefix "
1172 "of size %hhu for %s\n", c->length, c->name);
1173 free(c);
1174 } else
1175 assigned_any = true;
1176
1177 free(entry);
1178 }
1179
1180 list_for_each_entry(c, &prefix->assignments, head)
1181 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1182 interface_set_prefix_address(c, prefix, iface, true);
1183
1184 if (!assigned_any)
1185 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
1186 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
1187 }
1188
1189
1190 void interface_refresh_assignments(bool hint)
1191 {
1192 static bool refresh = false;
1193 if (!hint && refresh) {
1194 struct device_prefix *p;
1195 list_for_each_entry(p, &prefixes, head)
1196 interface_update_prefix_assignments(p, true);
1197 }
1198 refresh = hint;
1199 }
1200
1201 void interface_update_prefix_delegation(struct interface_ip_settings *ip)
1202 {
1203 struct device_prefix *prefix;
1204
1205 vlist_for_each_element(&ip->prefix, prefix, node) {
1206 interface_update_prefix_assignments(prefix, !ip->no_delegation);
1207
1208 if (ip->no_delegation) {
1209 if (prefix->head.next)
1210 list_del(&prefix->head);
1211 } else
1212 list_add(&prefix->head, &prefixes);
1213 }
1214 }
1215
1216 static void
1217 interface_update_prefix(struct vlist_tree *tree,
1218 struct vlist_node *node_new,
1219 struct vlist_node *node_old)
1220 {
1221 struct device_prefix *prefix_old, *prefix_new;
1222 prefix_old = container_of(node_old, struct device_prefix, node);
1223 prefix_new = container_of(node_new, struct device_prefix, node);
1224
1225 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
1226 if (tree && (!node_new || !node_old))
1227 ip->iface->updated |= IUF_PREFIX;
1228
1229 struct device_route route;
1230 memset(&route, 0, sizeof(route));
1231 route.flags = DEVADDR_INET6;
1232 route.metric = INT32_MAX;
1233 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
1234 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
1235
1236
1237 struct device_prefix_assignment *c;
1238 struct interface *iface;
1239
1240 if (node_old && node_new) {
1241 /* Move assignments and refresh addresses to update valid times */
1242 list_splice(&prefix_old->assignments, &prefix_new->assignments);
1243
1244 list_for_each_entry(c, &prefix_new->assignments, head)
1245 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1246 interface_set_prefix_address(c, prefix_new, iface, true);
1247
1248 if (prefix_new->preferred_until != prefix_old->preferred_until ||
1249 prefix_new->valid_until != prefix_old->valid_until)
1250 ip->iface->updated |= IUF_PREFIX;
1251 } else if (node_new) {
1252 /* Set null-route to avoid routing loops */
1253 system_add_route(NULL, &route);
1254
1255 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
1256 interface_update_prefix_assignments(prefix_new, true);
1257 } else if (node_old) {
1258 /* Remove null-route */
1259 interface_update_prefix_assignments(prefix_old, false);
1260 system_del_route(NULL, &route);
1261 }
1262
1263 if (node_old) {
1264 if (prefix_old->head.next)
1265 list_del(&prefix_old->head);
1266 free(prefix_old);
1267 }
1268
1269 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1270 list_add(&prefix_new->head, &prefixes);
1271
1272 }
1273
1274 struct device_prefix*
1275 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1276 uint8_t length, time_t valid_until, time_t preferred_until,
1277 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1278 {
1279 union if_addr a = { .in6 = *addr };
1280
1281 if (!pclass)
1282 pclass = (iface) ? iface->name : "local";
1283
1284 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1285 if (!prefix)
1286 return NULL;
1287
1288 clear_if_addr(&a, length);
1289
1290 prefix->length = length;
1291 prefix->addr = a.in6;
1292 prefix->preferred_until = preferred_until;
1293 prefix->valid_until = valid_until;
1294 prefix->iface = iface;
1295 INIT_LIST_HEAD(&prefix->assignments);
1296
1297 if (excl_addr) {
1298 prefix->excl_addr = *excl_addr;
1299 prefix->excl_length = excl_length;
1300 }
1301
1302 strcpy(prefix->pclass, pclass);
1303
1304 if (iface)
1305 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1306 else
1307 interface_update_prefix(NULL, &prefix->node, NULL);
1308
1309 return prefix;
1310 }
1311
1312 void
1313 interface_ip_set_ula_prefix(const char *prefix)
1314 {
1315 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1316 if (prefix)
1317 strncpy(buf, prefix, sizeof(buf) - 1);
1318 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1319
1320 struct in6_addr addr;
1321 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1322 if (ula_prefix) {
1323 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1324 ula_prefix = NULL;
1325 }
1326 return;
1327 }
1328
1329 int length;
1330 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1331 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1332 return;
1333
1334 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1335 ula_prefix->length != length) {
1336 if (ula_prefix)
1337 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1338
1339 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1340 0, 0, NULL, 0, NULL);
1341 }
1342 }
1343
1344 static void
1345 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1346 {
1347 struct dns_server *s;
1348
1349 s = calloc(1, sizeof(*s));
1350 if (!s)
1351 return;
1352
1353 s->af = AF_INET;
1354 if (inet_pton(s->af, str, &s->addr.in))
1355 goto add;
1356
1357 s->af = AF_INET6;
1358 if (inet_pton(s->af, str, &s->addr.in))
1359 goto add;
1360
1361 free(s);
1362 return;
1363
1364 add:
1365 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1366 s->af == AF_INET6 ? '6' : '4', str);
1367 vlist_simple_add(&ip->dns_servers, &s->node);
1368 }
1369
1370 void
1371 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1372 {
1373 struct blob_attr *cur;
1374 int rem;
1375
1376 blobmsg_for_each_attr(cur, list, rem) {
1377 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1378 continue;
1379
1380 if (!blobmsg_check_attr(cur, false))
1381 continue;
1382
1383 interface_add_dns_server(ip, blobmsg_data(cur));
1384 }
1385 }
1386
1387 static void
1388 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1389 {
1390 struct dns_search_domain *s;
1391 int len = strlen(str);
1392
1393 s = calloc(1, sizeof(*s) + len + 1);
1394 if (!s)
1395 return;
1396
1397 D(INTERFACE, "Add DNS search domain: %s\n", str);
1398 memcpy(s->name, str, len);
1399 vlist_simple_add(&ip->dns_search, &s->node);
1400 }
1401
1402 void
1403 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1404 {
1405 struct blob_attr *cur;
1406 int rem;
1407
1408 blobmsg_for_each_attr(cur, list, rem) {
1409 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1410 continue;
1411
1412 if (!blobmsg_check_attr(cur, false))
1413 continue;
1414
1415 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1416 }
1417 }
1418
1419 static void
1420 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1421 {
1422 struct dns_server *s;
1423 struct dns_search_domain *d;
1424 const char *str;
1425 char buf[INET6_ADDRSTRLEN];
1426
1427 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1428 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1429 if (!str)
1430 continue;
1431
1432 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1433 fprintf(f, "nameserver %s%%%s\n", str, dev);
1434 else
1435 fprintf(f, "nameserver %s\n", str);
1436 }
1437
1438 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1439 fprintf(f, "search %s\n", d->name);
1440 }
1441 }
1442
1443 /* Sorting of interface resolver entries : */
1444 /* Primary on interface dns_metric : lowest metric first */
1445 /* Secondary on interface metric : lowest metric first */
1446 /* Finally alphabetical order of interface names */
1447 static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
1448 {
1449 const struct interface *iface1 = k1, *iface2 = k2;
1450
1451 if (iface1->dns_metric != iface2->dns_metric)
1452 return iface1->dns_metric - iface2->dns_metric;
1453
1454 if (iface1->metric != iface2->metric)
1455 return iface1->metric - iface2->metric;
1456
1457 return strcmp(iface1->name, iface2->name);
1458 }
1459
1460 static void
1461 __interface_write_dns_entries(FILE *f, const char *jail)
1462 {
1463 struct interface *iface;
1464 struct {
1465 struct avl_node node;
1466 } *entry, *n_entry;
1467 struct avl_tree resolv_conf_iface_entries;
1468
1469 avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
1470
1471 vlist_for_each_element(&interfaces, iface, node) {
1472 if (iface->state != IFS_UP)
1473 continue;
1474
1475 if (jail && (!iface->jail || strcmp(jail, iface->jail)))
1476 continue;
1477
1478 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1479 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1480 vlist_simple_empty(&iface->config_ip.dns_search) &&
1481 vlist_simple_empty(&iface->config_ip.dns_servers))
1482 continue;
1483
1484 entry = calloc(1, sizeof(*entry));
1485 if (!entry)
1486 continue;
1487
1488 entry->node.key = iface;
1489 avl_insert(&resolv_conf_iface_entries, &entry->node);
1490 }
1491
1492 avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
1493 iface = (struct interface *)entry->node.key;
1494 struct device *dev = iface->l3_dev.dev;
1495
1496 fprintf(f, "# Interface %s\n", iface->name);
1497
1498 write_resolv_conf_entries(f, &iface->config_ip, dev->ifname);
1499
1500 if (!iface->proto_ip.no_dns)
1501 write_resolv_conf_entries(f, &iface->proto_ip, dev->ifname);
1502 }
1503
1504 avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
1505 free(entry);
1506 }
1507
1508 void
1509 interface_write_resolv_conf(const char *jail)
1510 {
1511 size_t plen = (jail ? strlen(jail) + 1 : 0 ) + strlen(resolv_conf) + 1;
1512 char *path = alloca(plen);
1513 char *dpath = alloca(plen);
1514 char *tmppath = alloca(plen + 4);
1515 FILE *f;
1516 uint32_t crcold, crcnew;
1517
1518 if (jail) {
1519 sprintf(path, "/tmp/resolv.conf-%s.d/resolv.conf.auto", jail);
1520 strcpy(dpath, path);
1521 dpath = dirname(dpath);
1522 mkdir(dpath, 0755);
1523 } else {
1524 strcpy(path, resolv_conf);
1525 }
1526
1527 sprintf(tmppath, "%s.tmp", path);
1528 unlink(tmppath);
1529 f = fopen(tmppath, "w+");
1530 if (!f) {
1531 D(INTERFACE, "Failed to open %s for writing\n", path);
1532 return;
1533 }
1534
1535 __interface_write_dns_entries(f, jail);
1536
1537 fflush(f);
1538 rewind(f);
1539 crcnew = crc32_file(f);
1540 fclose(f);
1541
1542 crcold = crcnew + 1;
1543 f = fopen(path, "r");
1544 if (f) {
1545 crcold = crc32_file(f);
1546 fclose(f);
1547 }
1548
1549 if (crcold == crcnew) {
1550 unlink(tmppath);
1551 } else if (rename(tmppath, path) < 0) {
1552 D(INTERFACE, "Failed to replace %s\n", path);
1553 unlink(tmppath);
1554 }
1555 }
1556
1557 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1558 {
1559 struct device_addr *addr;
1560 struct device_route *route;
1561 struct device_neighbor *neighbor;
1562 struct device *dev;
1563 struct interface *iface;
1564
1565 ip->enabled = enabled;
1566 iface = ip->iface;
1567 dev = iface->l3_dev.dev;
1568 if (!dev)
1569 return;
1570
1571 vlist_for_each_element(&ip->addr, addr, node) {
1572 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1573
1574 if (addr->flags & DEVADDR_EXTERNAL)
1575 continue;
1576
1577 if (addr->enabled == enabled)
1578 continue;
1579
1580 if (enabled) {
1581 system_add_address(dev, addr);
1582
1583 addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1584 if (iface->metric || addr->policy_table)
1585 interface_handle_subnet_route(iface, addr, true);
1586
1587 if (addr->policy_table)
1588 interface_add_addr_rules(addr, true);
1589 } else {
1590 interface_handle_subnet_route(iface, addr, false);
1591 system_del_address(dev, addr);
1592
1593 if (addr->policy_table)
1594 interface_add_addr_rules(addr, false);
1595 }
1596 addr->enabled = enabled;
1597 }
1598
1599 vlist_for_each_element(&ip->route, route, node) {
1600 bool _enabled = enabled;
1601
1602 if (route->flags & DEVADDR_EXTERNAL)
1603 continue;
1604
1605 if (!enable_route(ip, route))
1606 _enabled = false;
1607 if (route->enabled == _enabled)
1608 continue;
1609
1610 if (_enabled) {
1611 interface_set_route_info(ip->iface, route);
1612
1613 if (system_add_route(dev, route))
1614 route->failed = true;
1615 } else
1616 system_del_route(dev, route);
1617 route->enabled = _enabled;
1618 }
1619
1620 vlist_for_each_element(&ip->neighbor, neighbor, node) {
1621 if (neighbor->enabled == enabled)
1622 continue;
1623
1624 if (enabled) {
1625 if(system_add_neighbor(dev, neighbor))
1626 neighbor->failed = true;
1627 } else
1628 system_del_neighbor(dev, neighbor);
1629
1630 neighbor->enabled = enabled;
1631 }
1632
1633 struct device_prefix *c;
1634 struct device_prefix_assignment *a;
1635 list_for_each_entry(c, &prefixes, head)
1636 list_for_each_entry(a, &c->assignments, head)
1637 if (!strcmp(a->name, ip->iface->name))
1638 interface_set_prefix_address(a, c, ip->iface, enabled);
1639
1640 if (ip->iface->policy_rules_set != enabled &&
1641 ip->iface->l3_dev.dev) {
1642 set_ip_lo_policy(enabled, true, ip->iface);
1643 set_ip_lo_policy(enabled, false, ip->iface);
1644
1645 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1646 NULL, 0, 0, ip->iface, "failed_policy", true);
1647 ip->iface->policy_rules_set = enabled;
1648 }
1649 }
1650
1651 void
1652 interface_ip_update_start(struct interface_ip_settings *ip)
1653 {
1654 if (ip != &ip->iface->config_ip) {
1655 vlist_simple_update(&ip->dns_servers);
1656 vlist_simple_update(&ip->dns_search);
1657 }
1658 vlist_update(&ip->route);
1659 vlist_update(&ip->addr);
1660 vlist_update(&ip->prefix);
1661 vlist_update(&ip->neighbor);
1662 }
1663
1664 void
1665 interface_ip_update_complete(struct interface_ip_settings *ip)
1666 {
1667 vlist_simple_flush(&ip->dns_servers);
1668 vlist_simple_flush(&ip->dns_search);
1669 vlist_flush(&ip->route);
1670 vlist_flush(&ip->addr);
1671 vlist_flush(&ip->prefix);
1672 vlist_flush(&ip->neighbor);
1673 interface_write_resolv_conf(ip->iface->jail);
1674 }
1675
1676 void
1677 interface_ip_flush(struct interface_ip_settings *ip)
1678 {
1679 if (ip == &ip->iface->proto_ip)
1680 vlist_flush_all(&ip->iface->host_routes);
1681 vlist_simple_flush_all(&ip->dns_servers);
1682 vlist_simple_flush_all(&ip->dns_search);
1683 vlist_flush_all(&ip->route);
1684 vlist_flush_all(&ip->addr);
1685 vlist_flush_all(&ip->neighbor);
1686 vlist_flush_all(&ip->prefix);
1687 }
1688
1689 static void
1690 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1691 {
1692 ip->iface = iface;
1693 ip->enabled = true;
1694 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1695 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1696 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1697 vlist_init(&ip->neighbor, neighbor_cmp, interface_update_proto_neighbor);
1698 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1699 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1700 }
1701
1702 void
1703 interface_ip_init(struct interface *iface)
1704 {
1705 __interface_ip_init(&iface->proto_ip, iface);
1706 __interface_ip_init(&iface->config_ip, iface);
1707 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1708 }
1709
1710 static void
1711 interface_ip_valid_until_handler(struct uloop_timeout *t)
1712 {
1713 time_t now = system_get_rtime();
1714 struct interface *iface;
1715 vlist_for_each_element(&interfaces, iface, node) {
1716 if (iface->state != IFS_UP)
1717 continue;
1718
1719 struct device_addr *addr, *addrp;
1720 struct device_route *route, *routep;
1721 struct device_prefix *pref, *prefp;
1722
1723 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1724 if (addr->valid_until && addr->valid_until < now)
1725 vlist_delete(&iface->proto_ip.addr, &addr->node);
1726
1727 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1728 if (route->valid_until && route->valid_until < now)
1729 vlist_delete(&iface->proto_ip.route, &route->node);
1730
1731 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1732 if (pref->valid_until && pref->valid_until < now)
1733 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1734
1735 }
1736
1737 uloop_timeout_set(t, 1000);
1738 }
1739
1740 static void __init
1741 interface_ip_init_worker(void)
1742 {
1743 valid_until_timeout.cb = interface_ip_valid_until_handler;
1744 uloop_timeout_set(&valid_until_timeout, 1000);
1745 }
OpenWrt Network interface configuration daemon