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