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netifd: Don't assume routes are always applied in all cases
[project/netifd.git] / interface-ip.c
1 /*
2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2012 Steven Barth <steven@midlink.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15 #include <string.h>
16 #include <stdlib.h>
17 #include <stdio.h>
18
19 #include <limits.h>
20 #include <arpa/inet.h>
21 #include <netinet/in.h>
22
23 #include "netifd.h"
24 #include "device.h"
25 #include "interface.h"
26 #include "interface-ip.h"
27 #include "proto.h"
28 #include "ubus.h"
29 #include "system.h"
30
31 enum {
32 ROUTE_INTERFACE,
33 ROUTE_TARGET,
34 ROUTE_MASK,
35 ROUTE_GATEWAY,
36 ROUTE_METRIC,
37 ROUTE_MTU,
38 ROUTE_VALID,
39 ROUTE_TABLE,
40 ROUTE_SOURCE,
41 __ROUTE_MAX
42 };
43
44 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
45 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
46 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
47 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
48 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
49 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
50 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
51 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
52 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
53 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
54 };
55
56 const struct uci_blob_param_list route_attr_list = {
57 .n_params = __ROUTE_MAX,
58 .params = route_attr,
59 };
60
61
62 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
63 static struct device_prefix *ula_prefix = NULL;
64 static struct uloop_timeout valid_until_timeout;
65
66
67 static void
68 clear_if_addr(union if_addr *a, int mask)
69 {
70 int m_bytes = (mask + 7) / 8;
71 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
72 uint8_t *p = (uint8_t *) a;
73
74 if (m_bytes < sizeof(a))
75 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
76
77 p[m_bytes - 1] &= ~m_clear;
78 }
79
80 static bool
81 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
82 {
83 union if_addr *p1, *p2;
84
85 p1 = alloca(sizeof(*a1));
86 p2 = alloca(sizeof(*a2));
87
88 memcpy(p1, a1, sizeof(*a1));
89 clear_if_addr(p1, mask);
90 memcpy(p2, a2, sizeof(*a2));
91 clear_if_addr(p2, mask);
92
93 return !memcmp(p1, p2, sizeof(*p1));
94 }
95
96 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
97 const union if_addr *addr, uint8_t mask, unsigned int table,
98 struct interface *in_iface, const char *action)
99 {
100 struct iprule rule = {
101 .flags = IPRULE_PRIORITY,
102 .priority = priority
103 };
104
105 if (addr) {
106 rule.flags |= IPRULE_SRC;
107 rule.src_addr = *addr;
108 rule.src_mask = mask;
109 }
110
111 if (table) {
112 rule.flags |= IPRULE_LOOKUP;
113 rule.lookup = table;
114
115 if (!rule.lookup)
116 return 0;
117 } else if (action) {
118 rule.flags |= IPRULE_ACTION;
119 system_resolve_iprule_action(action, &rule.action);
120 }
121
122 if (in_iface && in_iface->l3_dev.dev) {
123 rule.flags |= IPRULE_IN;
124 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
125 }
126
127 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
128
129 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
130 }
131
132 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
133 {
134 struct iprule rule = {
135 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
136 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
137 .lookup = (v6) ? iface->ip6table : iface->ip4table,
138 .in_dev = "lo"
139 };
140
141 if (!rule.lookup)
142 return 0;
143
144 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
145
146 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
147 }
148
149 static bool
150 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
151 {
152 struct device_addr *addr;
153
154 vlist_for_each_element(&ip->addr, addr, node) {
155 if (!addr->enabled)
156 continue;
157
158 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
159 continue;
160
161 // Handle offlink addresses correctly
162 unsigned int mask = addr->mask;
163 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
164 (addr->flags & DEVADDR_OFFLINK))
165 mask = 128;
166
167 if (!match_if_addr(&addr->addr, a, mask))
168 continue;
169
170 return true;
171 }
172
173 return false;
174 }
175
176 static void
177 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
178 bool v6, struct device_route **res)
179 {
180 struct device_route *route;
181
182 vlist_for_each_element(&ip->route, route, node) {
183 if (!route->enabled)
184 continue;
185
186 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
187 continue;
188
189 if (!match_if_addr(&route->addr, a, route->mask))
190 continue;
191
192 if (route->flags & DEVROUTE_TABLE)
193 continue;
194
195 if (!*res || route->mask < (*res)->mask)
196 *res = route;
197 }
198 }
199
200 static bool
201 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
202 {
203 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
204 __find_ip_addr_target(&iface->config_ip, a, v6);
205 }
206
207 static void
208 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
209 bool v6, struct device_route **route)
210 {
211 __find_ip_route_target(&iface->proto_ip, a, v6, route);
212 __find_ip_route_target(&iface->config_ip, a, v6, route);
213 }
214
215 struct interface *
216 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
217 {
218 struct device_route *route, *r_next = NULL;
219 bool defaultroute_target = false;
220 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
221
222 route = calloc(1, sizeof(*route));
223 if (!route)
224 return NULL;
225
226 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
227 route->mask = v6 ? 128 : 32;
228 if (memcmp(&route->addr, addr, addrsize) == 0)
229 defaultroute_target = true;
230 else
231 memcpy(&route->addr, addr, addrsize);
232
233 if (iface) {
234 /* look for locally addressable target first */
235 if (interface_ip_find_addr_target(iface, addr, v6))
236 goto done;
237
238 /* do not stop at the first route, let the lookup compare
239 * masks to find the best match */
240 interface_ip_find_route_target(iface, addr, v6, &r_next);
241 } else {
242 vlist_for_each_element(&interfaces, iface, node) {
243 /* look for locally addressable target first */
244 if (interface_ip_find_addr_target(iface, addr, v6))
245 goto done;
246
247 /* do not stop at the first route, let the lookup compare
248 * masks to find the best match */
249 interface_ip_find_route_target(iface, addr, v6, &r_next);
250 }
251 }
252
253 if (!r_next) {
254 free(route);
255 return NULL;
256 }
257
258 iface = r_next->iface;
259 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
260 route->mtu = r_next->mtu;
261 route->metric = r_next->metric;
262 route->table = r_next->table;
263
264 done:
265 route->iface = iface;
266 if (defaultroute_target)
267 free(route);
268 else
269 vlist_add(&iface->host_routes, &route->node, route);
270 return iface;
271 }
272
273 void
274 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
275 {
276 struct interface_ip_settings *ip;
277 struct blob_attr *tb[__ROUTE_MAX], *cur;
278 struct device_route *route;
279 int af = v6 ? AF_INET6 : AF_INET;
280 bool is_proto_route = !!iface;
281
282 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
283
284 if (!iface) {
285 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
286 return;
287
288 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
289 if (!iface)
290 return;
291
292 ip = &iface->config_ip;
293 } else {
294 ip = &iface->proto_ip;
295 }
296
297 route = calloc(1, sizeof(*route));
298 if (!route)
299 return;
300
301 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
302 route->mask = v6 ? 128 : 32;
303 if ((cur = tb[ROUTE_MASK]) != NULL) {
304 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
305 if (route->mask > (v6 ? 128 : 32))
306 goto error;
307 }
308
309 if ((cur = tb[ROUTE_TARGET]) != NULL) {
310 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
311 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
312 goto error;
313 }
314 }
315
316 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
317 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
318 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
319 goto error;
320 }
321 }
322
323 if ((cur = tb[ROUTE_METRIC]) != NULL) {
324 route->metric = blobmsg_get_u32(cur);
325 route->flags |= DEVROUTE_METRIC;
326 } else
327 route->metric = iface->metric;
328
329 if ((cur = tb[ROUTE_MTU]) != NULL) {
330 route->mtu = blobmsg_get_u32(cur);
331 route->flags |= DEVROUTE_MTU;
332 }
333
334 // Use source-based routing
335 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
336 char *saveptr, *source = alloca(blobmsg_data_len(cur));
337 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
338
339 const char *addr = strtok_r(source, "/", &saveptr);
340 const char *mask = strtok_r(NULL, "/", &saveptr);
341
342 if (!addr || inet_pton(af, addr, &route->source) < 1) {
343 DPRINTF("Failed to parse route source: %s\n", addr);
344 goto error;
345 }
346
347 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
348 }
349
350 if (is_proto_route) {
351 route->table = (v6) ? iface->ip6table : iface->ip4table;
352 route->flags |= DEVROUTE_SRCTABLE;
353 }
354
355 if ((cur = tb[ROUTE_TABLE]) != NULL) {
356 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
357 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
358 goto error;
359 }
360
361 if (route->table)
362 route->flags |= DEVROUTE_TABLE;
363 }
364
365 if ((cur = tb[ROUTE_VALID]) != NULL) {
366 int64_t valid = blobmsg_get_u32(cur);
367 int64_t valid_until = valid + (int64_t)system_get_rtime();
368 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
369 route->valid_until = valid_until;
370 }
371
372 vlist_add(&ip->route, &route->node, route);
373 return;
374
375 error:
376 free(route);
377 }
378
379 static int
380 addr_cmp(const void *k1, const void *k2, void *ptr)
381 {
382 return memcmp(k1, k2, sizeof(struct device_addr) -
383 offsetof(struct device_addr, flags));
384 }
385
386 static int
387 route_cmp(const void *k1, const void *k2, void *ptr)
388 {
389 const struct device_route *r1 = k1, *r2 = k2;
390
391 if (r1->mask != r2->mask)
392 return r2->mask - r1->mask;
393
394 if (r1->metric != r2->metric)
395 return r1->metric - r2->metric;
396
397 if (r1->flags != r2->flags)
398 return r2->flags - r1->flags;
399
400 if (r1->sourcemask != r2->sourcemask)
401 return r1->sourcemask - r2->sourcemask;
402
403 if (r1->table != r2->table)
404 return r1->table - r2->table;
405
406 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
407 if (maskcmp)
408 return maskcmp;
409
410 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
411 }
412
413 static int
414 prefix_cmp(const void *k1, const void *k2, void *ptr)
415 {
416 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
417 offsetof(struct device_prefix, addr));
418 }
419
420 static void
421 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
422 {
423 struct device *dev = iface->l3_dev.dev;
424 struct device_route route;
425
426 memset(&route, 0, sizeof(route));
427 route.iface = iface;
428 route.flags = addr->flags;
429 route.mask = addr->mask;
430 memcpy(&route.addr, &addr->addr, sizeof(route.addr));
431 clear_if_addr(&route.addr, route.mask);
432
433 if (add) {
434 route.flags |= DEVADDR_KERNEL;
435 system_del_route(dev, &route);
436
437 if (!(addr->flags & DEVADDR_OFFLINK)) {
438 route.flags &= ~DEVADDR_KERNEL;
439 route.metric = iface->metric;
440 system_add_route(dev, &route);
441 }
442 } else {
443 if (!(addr->flags & DEVADDR_OFFLINK))
444 system_del_route(dev, &route);
445 }
446 }
447
448 static void
449 interface_update_proto_addr(struct vlist_tree *tree,
450 struct vlist_node *node_new,
451 struct vlist_node *node_old)
452 {
453 struct interface_ip_settings *ip;
454 struct interface *iface;
455 struct device *dev;
456 struct device_addr *a_new = NULL, *a_old = NULL;
457 bool replace = false;
458 bool keep = false;
459 bool v6 = false;
460
461 ip = container_of(tree, struct interface_ip_settings, addr);
462 iface = ip->iface;
463 dev = iface->l3_dev.dev;
464
465 if (!node_new || !node_old)
466 iface->updated |= IUF_ADDRESS;
467
468 if (node_new) {
469 a_new = container_of(node_new, struct device_addr, node);
470
471 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
472 !a_new->broadcast) {
473
474 uint32_t mask = ~0;
475 uint32_t *a = (uint32_t *) &a_new->addr;
476
477 mask >>= a_new->mask;
478 a_new->broadcast = *a | htonl(mask);
479 }
480 }
481
482 if (node_old)
483 a_old = container_of(node_old, struct device_addr, node);
484
485 if (a_new && a_old) {
486 keep = true;
487
488 if (a_old->flags != a_new->flags || a_old->failed)
489 keep = false;
490
491 if (a_old->valid_until != a_new->valid_until ||
492 a_old->preferred_until != a_new->preferred_until)
493 replace = true;
494
495 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
496 a_new->broadcast != a_old->broadcast)
497 keep = false;
498 }
499
500 if (node_old) {
501 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
502 interface_handle_subnet_route(iface, a_old, false);
503
504 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
505 v6 = true;
506
507 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
508
509 //This is needed for source routing to work correctly. If a device
510 //has two connections to a network using the same subnet, adding
511 //only the network-rule will cause packets to be routed through the
512 //first matching network (source IP matches both masks).
513 if (table) {
514 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
515 (v6) ? 128 : 32, table, NULL, NULL);
516 set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
517 a_old->mask, table, NULL, NULL);
518 }
519
520 system_del_address(dev, a_old);
521 }
522 free(a_old->pclass);
523 free(a_old);
524 }
525
526 if (node_new) {
527 a_new->enabled = true;
528 if (!(a_new->flags & DEVADDR_EXTERNAL) && (!keep || replace)) {
529 if (system_add_address(dev, a_new))
530 a_new->failed = true;
531
532 if (!keep) {
533 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
534 v6 = true;
535
536 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
537
538 if (table) {
539 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
540 (v6) ? 128 : 32, table, NULL, NULL);
541 set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
542 a_new->mask, table, NULL, NULL);
543 }
544 }
545
546 if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
547 interface_handle_subnet_route(iface, a_new, true);
548 }
549 }
550 }
551
552 static bool
553 enable_route(struct interface_ip_settings *ip, struct device_route *route)
554 {
555 if (ip->no_defaultroute && !route->mask)
556 return false;
557
558 return ip->enabled;
559 }
560
561 static void
562 interface_update_proto_route(struct vlist_tree *tree,
563 struct vlist_node *node_new,
564 struct vlist_node *node_old)
565 {
566 struct interface_ip_settings *ip;
567 struct interface *iface;
568 struct device *dev;
569 struct device_route *route_old, *route_new;
570 bool keep = false;
571
572 ip = container_of(tree, struct interface_ip_settings, route);
573 iface = ip->iface;
574 dev = iface->l3_dev.dev;
575
576 if (!node_new || !node_old)
577 iface->updated |= IUF_ROUTE;
578
579 route_old = container_of(node_old, struct device_route, node);
580 route_new = container_of(node_new, struct device_route, node);
581
582 if (node_old && node_new)
583 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
584 (route_old->table == route_new->table) && !route_old->failed;
585
586 if (node_old) {
587 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
588 system_del_route(dev, route_old);
589
590 free(route_old);
591 }
592
593 if (node_new) {
594 bool _enabled = enable_route(ip, route_new);
595
596 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
597 if (system_add_route(dev, route_new))
598 route_new->failed = true;
599
600 route_new->iface = iface;
601 route_new->enabled = _enabled;
602 }
603 }
604
605 static void
606 interface_update_host_route(struct vlist_tree *tree,
607 struct vlist_node *node_new,
608 struct vlist_node *node_old)
609 {
610 struct interface *iface;
611 struct device *dev;
612 struct device_route *route_old, *route_new;
613
614 iface = container_of(tree, struct interface, host_routes);
615 dev = iface->l3_dev.dev;
616
617 route_old = container_of(node_old, struct device_route, node);
618 route_new = container_of(node_new, struct device_route, node);
619
620 if (node_old) {
621 system_del_route(dev, route_old);
622 free(route_old);
623 }
624
625 if (node_new) {
626 if (system_add_route(dev, route_new))
627 route_new->failed = true;
628 }
629 }
630
631
632 static void
633 interface_set_prefix_address(struct device_prefix_assignment *assignment,
634 const struct device_prefix *prefix, struct interface *iface, bool add)
635 {
636 const struct interface *uplink = prefix->iface;
637 if (!iface->l3_dev.dev)
638 return;
639
640 struct device *l3_downlink = iface->l3_dev.dev;
641
642 struct device_addr addr;
643 memset(&addr, 0, sizeof(addr));
644 addr.addr.in6 = prefix->addr;
645 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
646 addr.addr.in6.s6_addr[15] += 1;
647 addr.mask = assignment->length;
648 addr.flags = DEVADDR_INET6;
649 addr.preferred_until = prefix->preferred_until;
650 addr.valid_until = prefix->valid_until;
651
652 if (!add && assignment->enabled) {
653 time_t now = system_get_rtime();
654 addr.preferred_until = now;
655 if (!addr.valid_until || addr.valid_until - now > 7200)
656 addr.valid_until = now + 7200;
657 system_del_address(l3_downlink, &addr); // Work around dangling prefix routes
658 system_add_address(l3_downlink, &addr);
659 if (prefix->iface) {
660 if (prefix->iface->ip6table)
661 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
662 addr.mask, prefix->iface->ip6table, iface, NULL);
663
664 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
665 addr.mask, 0, iface, "unreachable");
666 }
667
668 assignment->enabled = false;
669 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
670 !system_add_address(l3_downlink, &addr)) {
671 if (prefix->iface && !assignment->enabled) {
672 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
673 addr.mask, 0, iface, "unreachable");
674
675 if (prefix->iface->ip6table)
676 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
677 addr.mask, prefix->iface->ip6table, iface, NULL);
678 }
679 if (uplink && uplink->l3_dev.dev) {
680 int mtu = system_update_ipv6_mtu(
681 uplink->l3_dev.dev, 0);
682 if (mtu > 0)
683 system_update_ipv6_mtu(l3_downlink, mtu);
684 }
685 assignment->enabled = true;
686 }
687 }
688
689 static bool interface_prefix_assign(struct list_head *list,
690 struct device_prefix_assignment *assign)
691 {
692 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
693 struct device_prefix_assignment *c;
694 list_for_each_entry(c, list, head) {
695 if (assign->assigned != -1) {
696 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
697 list_add_tail(&assign->head, &c->head);
698 return true;
699 }
700 } else if (assign->assigned == -1) {
701 current = (current + asize) & (~asize);
702 if (current + asize < c->assigned) {
703 assign->assigned = current;
704 list_add_tail(&assign->head, &c->head);
705 return true;
706 }
707 }
708 current = (c->assigned + (1 << (64 - c->length)));
709 }
710 return false;
711 }
712
713 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
714 {
715 struct device_prefix_assignment *c;
716 struct interface *iface;
717
718 // Delete all assignments
719 while (!list_empty(&prefix->assignments)) {
720 c = list_first_entry(&prefix->assignments,
721 struct device_prefix_assignment, head);
722 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
723 interface_set_prefix_address(c, prefix, iface, false);
724 list_del(&c->head);
725 free(c);
726 }
727
728 if (!setup)
729 return;
730
731 // End-of-assignment sentinel
732 c = malloc(sizeof(*c) + 1);
733 c->assigned = 1 << (64 - prefix->length);
734 c->length = 64;
735 c->name[0] = 0;
736 list_add(&c->head, &prefix->assignments);
737
738 // Excluded prefix
739 if (prefix->excl_length > 0) {
740 const char name[] = "!excluded";
741 c = malloc(sizeof(*c) + sizeof(name));
742 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
743 ((1 << (64 - prefix->length)) - 1);
744 c->length = prefix->excl_length;
745 memcpy(c->name, name, sizeof(name));
746 list_add(&c->head, &prefix->assignments);
747 }
748
749 bool assigned_any = false;
750 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
751 vlist_for_each_element(&interfaces, iface, node) {
752 if (iface->assignment_length < 48 ||
753 iface->assignment_length > 64)
754 continue;
755
756 // Test whether there is a matching class
757 if (!list_empty(&iface->assignment_classes)) {
758 bool found = false;
759
760 struct interface_assignment_class *c;
761 list_for_each_entry(c, &iface->assignment_classes, head) {
762 if (!strcmp(c->name, prefix->pclass)) {
763 found = true;
764 break;
765 }
766 }
767
768 if (!found)
769 continue;
770 }
771
772 size_t namelen = strlen(iface->name) + 1;
773 c = malloc(sizeof(*c) + namelen);
774 c->length = iface->assignment_length;
775 c->assigned = iface->assignment_hint;
776 c->enabled = false;
777 memcpy(c->name, iface->name, namelen);
778
779 // First process all custom assignments, put all others in later-list
780 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
781 if (c->assigned != -1) {
782 c->assigned = -1;
783 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
784 "of size %hhu for %s, trying other\n", c->length, c->name);
785 }
786
787 struct list_head *next = &assign_later;
788 struct device_prefix_assignment *n;
789 list_for_each_entry(n, &assign_later, head) {
790 if (n->length < c->length) {
791 next = &n->head;
792 break;
793 }
794 }
795 list_add_tail(&c->head, next);
796 }
797
798 if (c->assigned != -1)
799 assigned_any = true;
800 }
801
802 // Then try to assign all other + failed custom assignments
803 while (!list_empty(&assign_later)) {
804 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
805 list_del(&c->head);
806
807 bool assigned = false;
808 do {
809 assigned = interface_prefix_assign(&prefix->assignments, c);
810 } while (!assigned && ++c->length <= 64);
811
812 if (!assigned) {
813 netifd_log_message(L_WARNING, "Failed to assign subprefix "
814 "of size %hhu for %s\n", c->length, c->name);
815 free(c);
816 } else {
817 assigned_any = true;
818 }
819 }
820
821 list_for_each_entry(c, &prefix->assignments, head)
822 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
823 interface_set_prefix_address(c, prefix, iface, true);
824
825 if (!assigned_any)
826 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
827 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
828 }
829
830
831 void interface_refresh_assignments(bool hint)
832 {
833 static bool refresh = false;
834 if (!hint && refresh) {
835 struct device_prefix *p;
836 list_for_each_entry(p, &prefixes, head)
837 interface_update_prefix_assignments(p, true);
838 }
839 refresh = hint;
840 }
841
842
843 static void
844 interface_update_prefix(struct vlist_tree *tree,
845 struct vlist_node *node_new,
846 struct vlist_node *node_old)
847 {
848 struct device_prefix *prefix_old, *prefix_new;
849 prefix_old = container_of(node_old, struct device_prefix, node);
850 prefix_new = container_of(node_new, struct device_prefix, node);
851
852 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
853 if (tree && (!node_new || !node_old))
854 ip->iface->updated |= IUF_PREFIX;
855
856 struct device_route route;
857 memset(&route, 0, sizeof(route));
858 route.flags = DEVADDR_INET6;
859 route.metric = INT32_MAX;
860 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
861 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
862
863
864 struct device_prefix_assignment *c;
865 struct interface *iface;
866
867 if (node_old && node_new) {
868 // Move assignments and refresh addresses to update valid times
869 list_splice(&prefix_old->assignments, &prefix_new->assignments);
870
871 list_for_each_entry(c, &prefix_new->assignments, head)
872 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
873 interface_set_prefix_address(c, prefix_new, iface, true);
874 } else if (node_new) {
875 // Set null-route to avoid routing loops
876 system_add_route(NULL, &route);
877
878 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
879 interface_update_prefix_assignments(prefix_new, true);
880 } else if (node_old) {
881 // Remove null-route
882 interface_update_prefix_assignments(prefix_old, false);
883 system_del_route(NULL, &route);
884 }
885
886 if (node_old) {
887 if (prefix_old->head.next)
888 list_del(&prefix_old->head);
889 free(prefix_old);
890 }
891
892 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
893 list_add(&prefix_new->head, &prefixes);
894
895 }
896
897 struct device_prefix*
898 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
899 uint8_t length, time_t valid_until, time_t preferred_until,
900 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
901 {
902 if (!pclass)
903 pclass = (iface) ? iface->name : "local";
904
905 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
906 prefix->length = length;
907 prefix->addr = *addr;
908 prefix->preferred_until = preferred_until;
909 prefix->valid_until = valid_until;
910 prefix->iface = iface;
911 INIT_LIST_HEAD(&prefix->assignments);
912
913 if (excl_addr) {
914 prefix->excl_addr = *excl_addr;
915 prefix->excl_length = excl_length;
916 }
917
918 strcpy(prefix->pclass, pclass);
919
920 if (iface)
921 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
922 else
923 interface_update_prefix(NULL, &prefix->node, NULL);
924
925 return prefix;
926 }
927
928 void
929 interface_ip_set_ula_prefix(const char *prefix)
930 {
931 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
932 if (prefix)
933 strncpy(buf, prefix, sizeof(buf) - 1);
934 char *prefixaddr = strtok_r(buf, "/", &saveptr);
935
936 struct in6_addr addr;
937 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
938 if (ula_prefix) {
939 interface_update_prefix(NULL, NULL, &ula_prefix->node);
940 ula_prefix = NULL;
941 }
942 return;
943 }
944
945 int length;
946 char *prefixlen = strtok_r(NULL, ",", &saveptr);
947 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
948 return;
949
950 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
951 ula_prefix->length != length) {
952 if (ula_prefix)
953 interface_update_prefix(NULL, NULL, &ula_prefix->node);
954
955 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
956 0, 0, NULL, 0, NULL);
957 }
958 }
959
960 void
961 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
962 {
963 struct dns_server *s;
964
965 s = calloc(1, sizeof(*s));
966 if (!s)
967 return;
968
969 s->af = AF_INET;
970 if (inet_pton(s->af, str, &s->addr.in))
971 goto add;
972
973 s->af = AF_INET6;
974 if (inet_pton(s->af, str, &s->addr.in))
975 goto add;
976
977 free(s);
978 return;
979
980 add:
981 D(INTERFACE, "Add IPv%c DNS server: %s\n",
982 s->af == AF_INET6 ? '6' : '4', str);
983 vlist_simple_add(&ip->dns_servers, &s->node);
984 }
985
986 void
987 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
988 {
989 struct blob_attr *cur;
990 int rem;
991
992 blobmsg_for_each_attr(cur, list, rem) {
993 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
994 continue;
995
996 if (!blobmsg_check_attr(cur, NULL))
997 continue;
998
999 interface_add_dns_server(ip, blobmsg_data(cur));
1000 }
1001 }
1002
1003 static void
1004 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1005 {
1006 struct dns_search_domain *s;
1007 int len = strlen(str);
1008
1009 s = calloc(1, sizeof(*s) + len + 1);
1010 if (!s)
1011 return;
1012
1013 D(INTERFACE, "Add DNS search domain: %s\n", str);
1014 memcpy(s->name, str, len);
1015 vlist_simple_add(&ip->dns_search, &s->node);
1016 }
1017
1018 void
1019 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1020 {
1021 struct blob_attr *cur;
1022 int rem;
1023
1024 blobmsg_for_each_attr(cur, list, rem) {
1025 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1026 continue;
1027
1028 if (!blobmsg_check_attr(cur, NULL))
1029 continue;
1030
1031 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1032 }
1033 }
1034
1035 static void
1036 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1037 {
1038 struct dns_server *s;
1039 struct dns_search_domain *d;
1040 const char *str;
1041 char buf[INET6_ADDRSTRLEN];
1042
1043 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1044 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1045 if (!str)
1046 continue;
1047
1048 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1049 fprintf(f, "nameserver %s%%%s\n", str, dev);
1050 else
1051 fprintf(f, "nameserver %s\n", str);
1052 }
1053
1054 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1055 fprintf(f, "search %s\n", d->name);
1056 }
1057 }
1058
1059 void
1060 interface_write_resolv_conf(void)
1061 {
1062 struct interface *iface;
1063 char *path = alloca(strlen(resolv_conf) + 5);
1064 FILE *f;
1065 uint32_t crcold, crcnew;
1066
1067 sprintf(path, "%s.tmp", resolv_conf);
1068 unlink(path);
1069 f = fopen(path, "w+");
1070 if (!f) {
1071 D(INTERFACE, "Failed to open %s for writing\n", path);
1072 return;
1073 }
1074
1075 vlist_for_each_element(&interfaces, iface, node) {
1076 if (iface->state != IFS_UP)
1077 continue;
1078
1079 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1080 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1081 vlist_simple_empty(&iface->config_ip.dns_search) &&
1082 vlist_simple_empty(&iface->config_ip.dns_servers))
1083 continue;
1084
1085 fprintf(f, "# Interface %s\n", iface->name);
1086 write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
1087 if (!iface->proto_ip.no_dns)
1088 write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
1089 }
1090 fflush(f);
1091 rewind(f);
1092 crcnew = crc32_file(f);
1093 fclose(f);
1094
1095 crcold = crcnew + 1;
1096 f = fopen(resolv_conf, "r");
1097 if (f) {
1098 crcold = crc32_file(f);
1099 fclose(f);
1100 }
1101
1102 if (crcold == crcnew) {
1103 unlink(path);
1104 } else if (rename(path, resolv_conf) < 0) {
1105 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1106 unlink(path);
1107 }
1108 }
1109
1110 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1111 {
1112 struct device_addr *addr;
1113 struct device_route *route;
1114 struct device *dev;
1115
1116 ip->enabled = enabled;
1117 dev = ip->iface->l3_dev.dev;
1118 if (!dev)
1119 return;
1120
1121 vlist_for_each_element(&ip->addr, addr, node) {
1122 if (addr->enabled == enabled)
1123 continue;
1124
1125 if (enabled)
1126 system_add_address(dev, addr);
1127 else
1128 system_del_address(dev, addr);
1129 addr->enabled = enabled;
1130 }
1131
1132 vlist_for_each_element(&ip->route, route, node) {
1133 bool _enabled = enabled;
1134
1135 if (!enable_route(ip, route))
1136 _enabled = false;
1137
1138 if (route->enabled == _enabled)
1139 continue;
1140
1141 if (_enabled) {
1142 if (!(route->flags & DEVROUTE_METRIC))
1143 route->metric = ip->iface->metric;
1144
1145 if (system_add_route(dev, route))
1146 route->failed = true;
1147 } else
1148 system_del_route(dev, route);
1149 route->enabled = _enabled;
1150 }
1151
1152 struct device_prefix *c;
1153 struct device_prefix_assignment *a;
1154 list_for_each_entry(c, &prefixes, head)
1155 list_for_each_entry(a, &c->assignments, head)
1156 if (!strcmp(a->name, ip->iface->name))
1157 interface_set_prefix_address(a, c, ip->iface, enabled);
1158
1159 if (ip->iface && ip->iface->l3_dev.dev) {
1160 set_ip_lo_policy(enabled, true, ip->iface);
1161 set_ip_lo_policy(enabled, false, ip->iface);
1162
1163 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1164 NULL, 0, 0, ip->iface, "failed_policy");
1165 }
1166 }
1167
1168 void
1169 interface_ip_update_start(struct interface_ip_settings *ip)
1170 {
1171 if (ip != &ip->iface->config_ip) {
1172 vlist_simple_update(&ip->dns_servers);
1173 vlist_simple_update(&ip->dns_search);
1174 }
1175 vlist_update(&ip->route);
1176 vlist_update(&ip->addr);
1177 vlist_update(&ip->prefix);
1178 }
1179
1180 void
1181 interface_ip_update_complete(struct interface_ip_settings *ip)
1182 {
1183 vlist_simple_flush(&ip->dns_servers);
1184 vlist_simple_flush(&ip->dns_search);
1185 vlist_flush(&ip->route);
1186 vlist_flush(&ip->addr);
1187 vlist_flush(&ip->prefix);
1188 interface_write_resolv_conf();
1189 }
1190
1191 void
1192 interface_ip_flush(struct interface_ip_settings *ip)
1193 {
1194 if (ip == &ip->iface->proto_ip)
1195 vlist_flush_all(&ip->iface->host_routes);
1196 vlist_simple_flush_all(&ip->dns_servers);
1197 vlist_simple_flush_all(&ip->dns_search);
1198 vlist_flush_all(&ip->route);
1199 vlist_flush_all(&ip->addr);
1200 vlist_flush_all(&ip->prefix);
1201 }
1202
1203 static void
1204 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1205 {
1206 ip->iface = iface;
1207 ip->enabled = true;
1208 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1209 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1210 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1211 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1212 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1213 }
1214
1215 void
1216 interface_ip_init(struct interface *iface)
1217 {
1218 __interface_ip_init(&iface->proto_ip, iface);
1219 __interface_ip_init(&iface->config_ip, iface);
1220 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1221
1222 }
1223
1224 static void
1225 interface_ip_valid_until_handler(struct uloop_timeout *t)
1226 {
1227 time_t now = system_get_rtime();
1228 struct interface *iface;
1229 vlist_for_each_element(&interfaces, iface, node) {
1230 if (iface->state != IFS_UP)
1231 continue;
1232
1233 struct device_addr *addr, *addrp;
1234 struct device_route *route, *routep;
1235 struct device_prefix *pref, *prefp;
1236
1237 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1238 if (addr->valid_until && addr->valid_until < now)
1239 vlist_delete(&iface->proto_ip.addr, &addr->node);
1240
1241 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1242 if (route->valid_until && route->valid_until < now)
1243 vlist_delete(&iface->proto_ip.route, &route->node);
1244
1245 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1246 if (pref->valid_until && pref->valid_until < now)
1247 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1248
1249 }
1250
1251 uloop_timeout_set(t, 1000);
1252 }
1253
1254 static void __init
1255 interface_ip_init_worker(void)
1256 {
1257 valid_until_timeout.cb = interface_ip_valid_until_handler;
1258 uloop_timeout_set(&valid_until_timeout, 1000);
1259 }
OpenWrt Network interface configuration daemon