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Add option "delegate" to toggle prefix delegation
[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 <unistd.h>
19
20 #include <limits.h>
21 #include <arpa/inet.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 list_head source_tables = LIST_HEAD_INIT(source_tables);
64 static struct device_prefix *ula_prefix = NULL;
65 static struct uloop_timeout valid_until_timeout;
66
67
68 static void
69 clear_if_addr(union if_addr *a, int mask)
70 {
71 int m_bytes = (mask + 7) / 8;
72 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
73 uint8_t *p = (uint8_t *) a;
74
75 if (m_bytes < sizeof(a))
76 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
77
78 p[m_bytes - 1] &= ~m_clear;
79 }
80
81 static bool
82 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
83 {
84 union if_addr *p1, *p2;
85
86 p1 = alloca(sizeof(*a1));
87 p2 = alloca(sizeof(*a2));
88
89 memcpy(p1, a1, sizeof(*a1));
90 clear_if_addr(p1, mask);
91 memcpy(p2, a2, sizeof(*a2));
92 clear_if_addr(p2, mask);
93
94 return !memcmp(p1, p2, sizeof(*p1));
95 }
96
97 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
98 const union if_addr *addr, uint8_t mask, unsigned int table,
99 struct interface *in_iface, const char *action)
100 {
101 struct iprule rule = {
102 .flags = IPRULE_PRIORITY,
103 .priority = priority
104 };
105
106 if (addr) {
107 rule.flags |= IPRULE_SRC;
108 rule.src_addr = *addr;
109 rule.src_mask = mask;
110 }
111
112 if (table) {
113 rule.flags |= IPRULE_LOOKUP;
114 rule.lookup = table;
115
116 if (!rule.lookup)
117 return 0;
118 } else if (action) {
119 rule.flags |= IPRULE_ACTION;
120 system_resolve_iprule_action(action, &rule.action);
121 }
122
123 if (in_iface && in_iface->l3_dev.dev) {
124 rule.flags |= IPRULE_IN;
125 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
126 }
127
128 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
129
130 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
131 }
132
133 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
134 {
135 struct iprule rule = {
136 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
137 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
138 .lookup = (v6) ? iface->ip6table : iface->ip4table,
139 .in_dev = "lo"
140 };
141
142 if (!rule.lookup)
143 return 0;
144
145 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
146
147 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
148 }
149
150 static bool
151 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
152 {
153 struct device_addr *addr;
154
155 vlist_for_each_element(&ip->addr, addr, node) {
156 if (!addr->enabled)
157 continue;
158
159 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
160 continue;
161
162 // Handle offlink addresses correctly
163 unsigned int mask = addr->mask;
164 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
165 (addr->flags & DEVADDR_OFFLINK))
166 mask = 128;
167
168 if (!match_if_addr(&addr->addr, a, mask))
169 continue;
170
171 return true;
172 }
173
174 return false;
175 }
176
177 static void
178 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
179 bool v6, struct device_route **res)
180 {
181 struct device_route *route;
182
183 vlist_for_each_element(&ip->route, route, node) {
184 if (!route->enabled)
185 continue;
186
187 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
188 continue;
189
190 if (!match_if_addr(&route->addr, a, route->mask))
191 continue;
192
193 if (route->flags & DEVROUTE_TABLE)
194 continue;
195
196 if (!*res || route->mask < (*res)->mask)
197 *res = route;
198 }
199 }
200
201 static struct device_source_table*
202 find_source_table(const struct device_route *route)
203 {
204 struct device_source_table key = {
205 .v6 = (route->flags & DEVADDR_FAMILY) == DEVADDR_INET6,
206 .addr = route->source,
207 .mask = route->sourcemask
208 };
209 struct device_source_table *c;
210 list_for_each_entry(c, &source_tables, head)
211 if (!memcmp(&c->v6, &key.v6, sizeof(key) -
212 offsetof(struct device_source_table, v6)))
213 return c;
214 return NULL;
215 }
216
217 static uint32_t
218 get_source_table(const struct device_route *route)
219 {
220 if (route->table || route->sourcemask == 0)
221 return route->table;
222
223 struct device_source_table *tbl = find_source_table(route);
224
225 if (!tbl) {
226 tbl = calloc(1, sizeof(*tbl));
227 tbl->addr = route->source;
228 tbl->mask = route->sourcemask;
229 tbl->v6 = (route->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
230 tbl->table = IPRULE_PRIORITY_SOURCE | (((~tbl->mask) & 0x7f) << 20);
231
232 struct list_head *before = NULL;
233 struct device_source_table *c;
234 list_for_each_entry(c, &source_tables, head) {
235 if (c->table > tbl->table) {
236 before = &c->head;
237 break;
238 } else if (c->table == tbl->table) {
239 ++tbl->table;
240 }
241 }
242
243 if (!before)
244 before = &source_tables;
245
246 list_add_tail(&tbl->head, before);
247 set_ip_source_policy(true, tbl->v6, tbl->table, &tbl->addr,
248 tbl->mask, tbl->table, NULL, NULL);
249 }
250
251 ++tbl->refcount;
252 return tbl->table;
253 }
254
255 static void
256 put_source_table(const struct device_route *route)
257 {
258 struct device_source_table *tbl = find_source_table(route);
259 if (tbl && tbl->table == route->table && --tbl->refcount == 0) {
260 set_ip_source_policy(false, tbl->v6, tbl->table, &tbl->addr,
261 tbl->mask, tbl->table, NULL, NULL);
262 list_del(&tbl->head);
263 free(tbl);
264 }
265 }
266
267 static bool
268 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
269 {
270 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
271 __find_ip_addr_target(&iface->config_ip, a, v6);
272 }
273
274 static void
275 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
276 bool v6, struct device_route **route)
277 {
278 __find_ip_route_target(&iface->proto_ip, a, v6, route);
279 __find_ip_route_target(&iface->config_ip, a, v6, route);
280 }
281
282 struct interface *
283 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
284 {
285 struct device_route *route, *r_next = NULL;
286 bool defaultroute_target = false;
287 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
288
289 route = calloc(1, sizeof(*route));
290 if (!route)
291 return NULL;
292
293 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
294 route->mask = v6 ? 128 : 32;
295 if (memcmp(&route->addr, addr, addrsize) == 0)
296 defaultroute_target = true;
297 else
298 memcpy(&route->addr, addr, addrsize);
299
300 if (iface) {
301 /* look for locally addressable target first */
302 if (interface_ip_find_addr_target(iface, addr, v6))
303 goto done;
304
305 /* do not stop at the first route, let the lookup compare
306 * masks to find the best match */
307 interface_ip_find_route_target(iface, addr, v6, &r_next);
308 } else {
309 vlist_for_each_element(&interfaces, iface, node) {
310 /* look for locally addressable target first */
311 if (interface_ip_find_addr_target(iface, addr, v6))
312 goto done;
313
314 /* do not stop at the first route, let the lookup compare
315 * masks to find the best match */
316 interface_ip_find_route_target(iface, addr, v6, &r_next);
317 }
318 }
319
320 if (!r_next) {
321 free(route);
322 return NULL;
323 }
324
325 iface = r_next->iface;
326 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
327 route->mtu = r_next->mtu;
328 route->metric = r_next->metric;
329 route->table = r_next->table;
330
331 done:
332 route->iface = iface;
333 if (defaultroute_target)
334 free(route);
335 else
336 vlist_add(&iface->host_routes, &route->node, route);
337 return iface;
338 }
339
340 void
341 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
342 {
343 struct interface_ip_settings *ip;
344 struct blob_attr *tb[__ROUTE_MAX], *cur;
345 struct device_route *route;
346 int af = v6 ? AF_INET6 : AF_INET;
347 bool is_proto_route = !!iface;
348
349 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
350
351 if (!iface) {
352 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
353 return;
354
355 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
356 if (!iface)
357 return;
358
359 ip = &iface->config_ip;
360 } else {
361 ip = &iface->proto_ip;
362 }
363
364 route = calloc(1, sizeof(*route));
365 if (!route)
366 return;
367
368 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
369 route->mask = v6 ? 128 : 32;
370 if ((cur = tb[ROUTE_MASK]) != NULL) {
371 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
372 if (route->mask > (v6 ? 128 : 32))
373 goto error;
374 }
375
376 if ((cur = tb[ROUTE_TARGET]) != NULL) {
377 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
378 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
379 goto error;
380 }
381 }
382
383 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
384 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
385 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
386 goto error;
387 }
388 }
389
390 if ((cur = tb[ROUTE_METRIC]) != NULL) {
391 route->metric = blobmsg_get_u32(cur);
392 route->flags |= DEVROUTE_METRIC;
393 }
394
395 if ((cur = tb[ROUTE_MTU]) != NULL) {
396 route->mtu = blobmsg_get_u32(cur);
397 route->flags |= DEVROUTE_MTU;
398 }
399
400 // Use source-based routing
401 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
402 char *saveptr, *source = alloca(blobmsg_data_len(cur));
403 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
404
405 const char *addr = strtok_r(source, "/", &saveptr);
406 const char *mask = strtok_r(NULL, "/", &saveptr);
407
408 if (inet_pton(af, addr, &route->source) < 1) {
409 DPRINTF("Failed to parse route source: %s\n", addr);
410 goto error;
411 }
412
413 route->sourcemask = atoi(mask);
414 } else if (is_proto_route) {
415 route->table = (v6) ? iface->ip6table : iface->ip4table;
416 route->flags |= DEVROUTE_SRCTABLE;
417 }
418
419 if ((cur = tb[ROUTE_TABLE]) != NULL) {
420 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
421 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
422 goto error;
423 }
424
425 if (route->table)
426 route->flags |= DEVROUTE_TABLE;
427 }
428
429 if ((cur = tb[ROUTE_VALID]) != NULL) {
430 int64_t valid = blobmsg_get_u32(cur);
431 int64_t valid_until = valid + (int64_t)system_get_rtime();
432 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
433 route->valid_until = valid_until;
434 }
435
436 if (route->sourcemask) {
437 route->table = get_source_table(route);
438 route->flags |= DEVROUTE_SRCTABLE;
439 }
440
441 vlist_add(&ip->route, &route->node, route);
442 return;
443
444 error:
445 free(route);
446 }
447
448 static int
449 addr_cmp(const void *k1, const void *k2, void *ptr)
450 {
451 return memcmp(k1, k2, sizeof(struct device_addr) -
452 offsetof(struct device_addr, flags));
453 }
454
455 static int
456 route_cmp(const void *k1, const void *k2, void *ptr)
457 {
458 const struct device_route *r1 = k1, *r2 = k2;
459
460 if (r1->mask != r2->mask)
461 return r2->mask - r1->mask;
462
463 if (r1->metric != r2->metric)
464 return r1->metric - r2->metric;
465
466 if (r1->flags != r2->flags)
467 return r2->flags - r1->flags;
468
469 if (r1->sourcemask != r2->sourcemask)
470 return r1->sourcemask - r2->sourcemask;
471
472 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
473 if (maskcmp)
474 return maskcmp;
475
476 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
477 }
478
479 static int
480 prefix_cmp(const void *k1, const void *k2, void *ptr)
481 {
482 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
483 offsetof(struct device_prefix, addr));
484 }
485
486 static void
487 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
488 {
489 struct device *dev = iface->l3_dev.dev;
490 struct device_route route;
491
492 memset(&route, 0, sizeof(route));
493 route.iface = iface;
494 route.flags = addr->flags;
495 route.mask = addr->mask;
496 memcpy(&route.addr, &addr->addr, sizeof(route.addr));
497 clear_if_addr(&route.addr, route.mask);
498
499 if (add) {
500 route.flags |= DEVADDR_KERNEL;
501 system_del_route(dev, &route);
502
503 if (!(addr->flags & DEVADDR_OFFLINK)) {
504 route.flags &= ~DEVADDR_KERNEL;
505 route.metric = iface->metric;
506 system_add_route(dev, &route);
507 }
508 } else {
509 if (!(addr->flags & DEVADDR_OFFLINK))
510 system_del_route(dev, &route);
511 }
512 }
513
514 static void
515 interface_update_proto_addr(struct vlist_tree *tree,
516 struct vlist_node *node_new,
517 struct vlist_node *node_old)
518 {
519 struct interface_ip_settings *ip;
520 struct interface *iface;
521 struct device *dev;
522 struct device_addr *a_new = NULL, *a_old = NULL;
523 bool replace = false;
524 bool keep = false;
525 bool v6 = false;
526
527 ip = container_of(tree, struct interface_ip_settings, addr);
528 iface = ip->iface;
529 dev = iface->l3_dev.dev;
530
531 if (node_new) {
532 a_new = container_of(node_new, struct device_addr, node);
533
534 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
535 !a_new->broadcast) {
536
537 uint32_t mask = ~0;
538 uint32_t *a = (uint32_t *) &a_new->addr;
539
540 mask >>= a_new->mask;
541 a_new->broadcast = *a | htonl(mask);
542 }
543 }
544
545 if (node_old)
546 a_old = container_of(node_old, struct device_addr, node);
547
548 if (a_new && a_old) {
549 keep = true;
550
551 if (a_old->flags != a_new->flags)
552 keep = false;
553
554 if (a_old->valid_until != a_new->valid_until ||
555 a_old->preferred_until != a_new->preferred_until)
556 replace = true;
557
558 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
559 a_new->broadcast != a_old->broadcast)
560 keep = false;
561 }
562
563 if (node_old) {
564 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
565 interface_handle_subnet_route(iface, a_old, false);
566
567 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
568 v6 = true;
569
570 //This is needed for source routing to work correctly. If a device
571 //has two connections to a network using the same subnet, adding
572 //only the network-rule will cause packets to be routed through the
573 //first matching network (source IP matches both masks).
574 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
575 (v6) ? 128 : 32, (v6) ? iface->ip6table : iface->ip4table,
576 NULL, NULL);
577 set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
578 a_old->mask, (v6) ? iface->ip6table : iface->ip4table, NULL, NULL);
579
580 system_del_address(dev, a_old);
581 }
582 free(a_old);
583 }
584
585 if (node_new) {
586 a_new->enabled = true;
587 if (!(a_new->flags & DEVADDR_EXTERNAL) && (!keep || replace)) {
588 system_add_address(dev, a_new);
589
590 if (!keep) {
591 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
592 v6 = true;
593
594 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
595 (v6) ? 128 : 32, (v6) ? iface->ip6table : iface->ip4table,
596 NULL, NULL);
597 set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
598 a_new->mask, (v6) ? iface->ip6table : iface->ip4table,
599 NULL, NULL);
600 }
601
602 if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
603 interface_handle_subnet_route(iface, a_new, true);
604 }
605 }
606 }
607
608 static bool
609 enable_route(struct interface_ip_settings *ip, struct device_route *route)
610 {
611 if (ip->no_defaultroute && !route->mask)
612 return false;
613
614 return ip->enabled;
615 }
616
617 static void
618 interface_update_proto_route(struct vlist_tree *tree,
619 struct vlist_node *node_new,
620 struct vlist_node *node_old)
621 {
622 struct interface_ip_settings *ip;
623 struct interface *iface;
624 struct device *dev;
625 struct device_route *route_old, *route_new;
626 bool keep = false;
627
628 ip = container_of(tree, struct interface_ip_settings, route);
629 iface = ip->iface;
630 dev = iface->l3_dev.dev;
631
632 route_old = container_of(node_old, struct device_route, node);
633 route_new = container_of(node_new, struct device_route, node);
634
635 if (node_old && node_new)
636 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
637
638 if (node_old) {
639 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
640 system_del_route(dev, route_old);
641
642 put_source_table(route_old);
643 free(route_old);
644 }
645
646 if (node_new) {
647 bool _enabled = enable_route(ip, route_new);
648
649 if (!(route_new->flags & DEVROUTE_METRIC))
650 route_new->metric = iface->metric;
651
652 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
653 system_add_route(dev, route_new);
654
655 route_new->iface = iface;
656 route_new->enabled = _enabled;
657 }
658 }
659
660 static void
661 interface_update_host_route(struct vlist_tree *tree,
662 struct vlist_node *node_new,
663 struct vlist_node *node_old)
664 {
665 struct interface *iface;
666 struct device *dev;
667 struct device_route *route_old, *route_new;
668
669 iface = container_of(tree, struct interface, host_routes);
670 dev = iface->l3_dev.dev;
671
672 route_old = container_of(node_old, struct device_route, node);
673 route_new = container_of(node_new, struct device_route, node);
674
675 if (node_old) {
676 system_del_route(dev, route_old);
677 free(route_old);
678 }
679
680 if (node_new)
681 system_add_route(dev, route_new);
682 }
683
684
685 static void
686 interface_set_prefix_address(struct device_prefix_assignment *assignment,
687 const struct device_prefix *prefix, struct interface *iface, bool add)
688 {
689 const struct interface *uplink = prefix->iface;
690 if (!iface->l3_dev.dev)
691 return;
692
693 struct device *l3_downlink = iface->l3_dev.dev;
694
695 struct device_addr addr;
696 memset(&addr, 0, sizeof(addr));
697 addr.addr.in6 = prefix->addr;
698 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
699 addr.addr.in6.s6_addr[15] += 1;
700 addr.mask = assignment->length;
701 addr.flags = DEVADDR_INET6;
702 addr.preferred_until = prefix->preferred_until;
703 addr.valid_until = prefix->valid_until;
704
705 if (!add && assignment->enabled) {
706 time_t now = system_get_rtime();
707 addr.preferred_until = now;
708 if (!addr.valid_until || addr.valid_until - now > 7200)
709 addr.valid_until = now + 7200;
710 system_add_address(l3_downlink, &addr);
711 if (prefix->iface) {
712 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
713 addr.mask, prefix->iface->ip6table, iface, NULL);
714
715 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
716 addr.mask, 0, iface, "unreachable");
717 }
718
719 assignment->enabled = false;
720 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
721 system_add_address(l3_downlink, &addr);
722 if (prefix->iface && !assignment->enabled) {
723 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
724 addr.mask, 0, iface, "unreachable");
725
726 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
727 addr.mask, prefix->iface->ip6table, iface, NULL);
728 }
729 if (uplink && uplink->l3_dev.dev) {
730 int mtu = system_update_ipv6_mtu(
731 uplink->l3_dev.dev, 0);
732 if (mtu > 0)
733 system_update_ipv6_mtu(l3_downlink, mtu);
734 }
735 assignment->enabled = true;
736 }
737 }
738
739 static bool interface_prefix_assign(struct list_head *list,
740 struct device_prefix_assignment *assign)
741 {
742 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
743 struct device_prefix_assignment *c;
744 list_for_each_entry(c, list, head) {
745 if (assign->assigned != -1) {
746 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
747 list_add_tail(&assign->head, &c->head);
748 return true;
749 }
750 } else if (assign->assigned == -1) {
751 current = (current + asize) & (~asize);
752 if (current + asize < c->assigned) {
753 assign->assigned = current;
754 list_add_tail(&assign->head, &c->head);
755 return true;
756 }
757 }
758 current = (c->assigned + (1 << (64 - c->length)));
759 }
760 return false;
761 }
762
763 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
764 {
765 struct device_prefix_assignment *c;
766 struct interface *iface;
767
768 // Delete all assignments
769 while (!list_empty(&prefix->assignments)) {
770 c = list_first_entry(&prefix->assignments,
771 struct device_prefix_assignment, head);
772 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
773 interface_set_prefix_address(c, prefix, iface, false);
774 list_del(&c->head);
775 free(c);
776 }
777
778 if (!setup)
779 return;
780
781 // End-of-assignment sentinel
782 c = malloc(sizeof(*c) + 1);
783 c->assigned = 1 << (64 - prefix->length);
784 c->length = 64;
785 c->name[0] = 0;
786 list_add(&c->head, &prefix->assignments);
787
788 // Excluded prefix
789 if (prefix->excl_length > 0) {
790 const char name[] = "!excluded";
791 c = malloc(sizeof(*c) + sizeof(name));
792 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
793 ((1 << (64 - prefix->length)) - 1);
794 c->length = prefix->excl_length;
795 memcpy(c->name, name, sizeof(name));
796 list_add(&c->head, &prefix->assignments);
797 }
798
799 bool assigned_any = false;
800 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
801 vlist_for_each_element(&interfaces, iface, node) {
802 if (iface->assignment_length < 48 ||
803 iface->assignment_length > 64)
804 continue;
805
806 // Test whether there is a matching class
807 if (!list_empty(&iface->assignment_classes)) {
808 bool found = false;
809
810 struct interface_assignment_class *c;
811 list_for_each_entry(c, &iface->assignment_classes, head) {
812 if (!strcmp(c->name, prefix->pclass)) {
813 found = true;
814 break;
815 }
816 }
817
818 if (!found)
819 continue;
820 }
821
822 size_t namelen = strlen(iface->name) + 1;
823 c = malloc(sizeof(*c) + namelen);
824 c->length = iface->assignment_length;
825 c->assigned = iface->assignment_hint;
826 c->enabled = false;
827 memcpy(c->name, iface->name, namelen);
828
829 // First process all custom assignments, put all others in later-list
830 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
831 if (c->assigned != -1) {
832 c->assigned = -1;
833 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
834 "of size %hhu for %s, trying other\n", c->length, c->name);
835 }
836
837 struct list_head *next = &assign_later;
838 struct device_prefix_assignment *n;
839 list_for_each_entry(n, &assign_later, head) {
840 if (n->length < c->length) {
841 next = &n->head;
842 break;
843 }
844 }
845 list_add_tail(&c->head, next);
846 }
847
848 if (c->assigned != -1)
849 assigned_any = true;
850 }
851
852 // Then try to assign all other + failed custom assignments
853 while (!list_empty(&assign_later)) {
854 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
855 list_del(&c->head);
856
857 bool assigned = false;
858 do {
859 assigned = interface_prefix_assign(&prefix->assignments, c);
860 } while (!assigned && ++c->length <= 64);
861
862 if (!assigned) {
863 netifd_log_message(L_WARNING, "Failed to assign subprefix "
864 "of size %hhu for %s\n", c->length, c->name);
865 free(c);
866 } else {
867 assigned_any = true;
868 }
869 }
870
871 list_for_each_entry(c, &prefix->assignments, head)
872 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
873 interface_set_prefix_address(c, prefix, iface, true);
874
875 if (!assigned_any)
876 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
877 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
878 }
879
880
881 void interface_refresh_assignments(bool hint)
882 {
883 static bool refresh = false;
884 if (!hint && refresh) {
885 struct device_prefix *p;
886 list_for_each_entry(p, &prefixes, head)
887 interface_update_prefix_assignments(p, true);
888 }
889 refresh = hint;
890 }
891
892
893 static void
894 interface_update_prefix(struct vlist_tree *tree,
895 struct vlist_node *node_new,
896 struct vlist_node *node_old)
897 {
898 struct device_prefix *prefix_old, *prefix_new;
899 prefix_old = container_of(node_old, struct device_prefix, node);
900 prefix_new = container_of(node_new, struct device_prefix, node);
901
902 struct device_route route;
903 memset(&route, 0, sizeof(route));
904 route.flags = DEVADDR_INET6;
905 route.metric = INT32_MAX;
906 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
907 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
908
909
910 struct device_prefix_assignment *c;
911 struct interface *iface;
912
913 if (node_old && node_new) {
914 // Move assignments and refresh addresses to update valid times
915 list_splice(&prefix_old->assignments, &prefix_new->assignments);
916
917 list_for_each_entry(c, &prefix_new->assignments, head)
918 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
919 interface_set_prefix_address(c, prefix_new, iface, true);
920 } else if (node_new) {
921 // Set null-route to avoid routing loops
922 system_add_route(NULL, &route);
923
924 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
925 interface_update_prefix_assignments(prefix_new, true);
926 } else if (node_old) {
927 // Remove null-route
928 interface_update_prefix_assignments(prefix_old, false);
929 system_del_route(NULL, &route);
930 }
931
932 if (node_old) {
933 if (prefix_old->head.next)
934 list_del(&prefix_old->head);
935 free(prefix_old);
936 }
937
938 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
939 list_add(&prefix_new->head, &prefixes);
940
941 }
942
943 struct device_prefix*
944 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
945 uint8_t length, time_t valid_until, time_t preferred_until,
946 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
947 {
948 if (!pclass)
949 pclass = (iface) ? iface->name : "local";
950
951 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
952 prefix->length = length;
953 prefix->addr = *addr;
954 prefix->preferred_until = preferred_until;
955 prefix->valid_until = valid_until;
956 prefix->iface = iface;
957 INIT_LIST_HEAD(&prefix->assignments);
958
959 if (excl_addr) {
960 prefix->excl_addr = *excl_addr;
961 prefix->excl_length = excl_length;
962 }
963
964 strcpy(prefix->pclass, pclass);
965
966 if (iface)
967 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
968 else
969 interface_update_prefix(NULL, &prefix->node, NULL);
970
971 return prefix;
972 }
973
974 void
975 interface_ip_set_ula_prefix(const char *prefix)
976 {
977 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
978 if (prefix)
979 strncpy(buf, prefix, sizeof(buf) - 1);
980 char *prefixaddr = strtok_r(buf, "/", &saveptr);
981
982 struct in6_addr addr;
983 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
984 if (ula_prefix) {
985 interface_update_prefix(NULL, NULL, &ula_prefix->node);
986 ula_prefix = NULL;
987 }
988 return;
989 }
990
991 int length;
992 char *prefixlen = strtok_r(NULL, ",", &saveptr);
993 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
994 return;
995
996 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
997 ula_prefix->length != length) {
998 if (ula_prefix)
999 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1000
1001 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1002 0, 0, NULL, 0, NULL);
1003 }
1004 }
1005
1006 void
1007 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1008 {
1009 struct dns_server *s;
1010
1011 s = calloc(1, sizeof(*s));
1012 if (!s)
1013 return;
1014
1015 s->af = AF_INET;
1016 if (inet_pton(s->af, str, &s->addr.in))
1017 goto add;
1018
1019 s->af = AF_INET6;
1020 if (inet_pton(s->af, str, &s->addr.in))
1021 goto add;
1022
1023 free(s);
1024 return;
1025
1026 add:
1027 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1028 s->af == AF_INET6 ? '6' : '4', str);
1029 vlist_simple_add(&ip->dns_servers, &s->node);
1030 }
1031
1032 void
1033 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1034 {
1035 struct blob_attr *cur;
1036 int rem;
1037
1038 blobmsg_for_each_attr(cur, list, rem) {
1039 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1040 continue;
1041
1042 if (!blobmsg_check_attr(cur, NULL))
1043 continue;
1044
1045 interface_add_dns_server(ip, blobmsg_data(cur));
1046 }
1047 }
1048
1049 static void
1050 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1051 {
1052 struct dns_search_domain *s;
1053 int len = strlen(str);
1054
1055 s = calloc(1, sizeof(*s) + len + 1);
1056 if (!s)
1057 return;
1058
1059 D(INTERFACE, "Add DNS search domain: %s\n", str);
1060 memcpy(s->name, str, len);
1061 vlist_simple_add(&ip->dns_search, &s->node);
1062 }
1063
1064 void
1065 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1066 {
1067 struct blob_attr *cur;
1068 int rem;
1069
1070 blobmsg_for_each_attr(cur, list, rem) {
1071 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1072 continue;
1073
1074 if (!blobmsg_check_attr(cur, NULL))
1075 continue;
1076
1077 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1078 }
1079 }
1080
1081 static void
1082 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
1083 {
1084 struct dns_server *s;
1085 struct dns_search_domain *d;
1086 const char *str;
1087 char buf[INET6_ADDRSTRLEN];
1088
1089 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1090 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1091 if (!str)
1092 continue;
1093
1094 fprintf(f, "nameserver %s\n", str);
1095 }
1096
1097 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1098 fprintf(f, "search %s\n", d->name);
1099 }
1100 }
1101
1102 void
1103 interface_write_resolv_conf(void)
1104 {
1105 struct interface *iface;
1106 char *path = alloca(strlen(resolv_conf) + 5);
1107 FILE *f;
1108 uint32_t crcold, crcnew;
1109
1110 sprintf(path, "%s.tmp", resolv_conf);
1111 unlink(path);
1112 f = fopen(path, "w+");
1113 if (!f) {
1114 D(INTERFACE, "Failed to open %s for writing\n", path);
1115 return;
1116 }
1117
1118 vlist_for_each_element(&interfaces, iface, node) {
1119 if (iface->state != IFS_UP)
1120 continue;
1121
1122 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1123 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1124 vlist_simple_empty(&iface->config_ip.dns_search) &&
1125 vlist_simple_empty(&iface->config_ip.dns_servers))
1126 continue;
1127
1128 fprintf(f, "# Interface %s\n", iface->name);
1129 write_resolv_conf_entries(f, &iface->config_ip);
1130 if (!iface->proto_ip.no_dns)
1131 write_resolv_conf_entries(f, &iface->proto_ip);
1132 }
1133 fflush(f);
1134 rewind(f);
1135 crcnew = crc32_file(f);
1136 fclose(f);
1137
1138 crcold = crcnew + 1;
1139 f = fopen(resolv_conf, "r");
1140 if (f) {
1141 crcold = crc32_file(f);
1142 fclose(f);
1143 }
1144
1145 if (crcold == crcnew) {
1146 unlink(path);
1147 } else if (rename(path, resolv_conf) < 0) {
1148 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1149 unlink(path);
1150 }
1151 }
1152
1153 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1154 {
1155 struct device_addr *addr;
1156 struct device_route *route;
1157 struct device *dev;
1158
1159 ip->enabled = enabled;
1160 dev = ip->iface->l3_dev.dev;
1161 if (!dev)
1162 return;
1163
1164 vlist_for_each_element(&ip->addr, addr, node) {
1165 if (addr->enabled == enabled)
1166 continue;
1167
1168 if (enabled)
1169 system_add_address(dev, addr);
1170 else
1171 system_del_address(dev, addr);
1172 addr->enabled = enabled;
1173 }
1174
1175 vlist_for_each_element(&ip->route, route, node) {
1176 bool _enabled = enabled;
1177
1178 if (!enable_route(ip, route))
1179 _enabled = false;
1180
1181 if (route->enabled == _enabled)
1182 continue;
1183
1184 if (_enabled) {
1185 if (!(route->flags & DEVROUTE_METRIC))
1186 route->metric = ip->iface->metric;
1187
1188 system_add_route(dev, route);
1189 } else
1190 system_del_route(dev, route);
1191 route->enabled = _enabled;
1192 }
1193
1194 struct device_prefix *c;
1195 struct device_prefix_assignment *a;
1196 list_for_each_entry(c, &prefixes, head)
1197 list_for_each_entry(a, &c->assignments, head)
1198 if (!strcmp(a->name, ip->iface->name))
1199 interface_set_prefix_address(a, c, ip->iface, enabled);
1200
1201 if (ip->iface && ip->iface->l3_dev.dev) {
1202 set_ip_lo_policy(enabled, true, ip->iface);
1203 set_ip_lo_policy(enabled, false, ip->iface);
1204
1205 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1206 NULL, 0, 0, ip->iface, "failed_policy");
1207 }
1208 }
1209
1210 void
1211 interface_ip_update_start(struct interface_ip_settings *ip)
1212 {
1213 if (ip != &ip->iface->config_ip) {
1214 vlist_simple_update(&ip->dns_servers);
1215 vlist_simple_update(&ip->dns_search);
1216 }
1217 vlist_update(&ip->route);
1218 vlist_update(&ip->addr);
1219 vlist_update(&ip->prefix);
1220 }
1221
1222 void
1223 interface_ip_update_complete(struct interface_ip_settings *ip)
1224 {
1225 vlist_simple_flush(&ip->dns_servers);
1226 vlist_simple_flush(&ip->dns_search);
1227 vlist_flush(&ip->route);
1228 vlist_flush(&ip->addr);
1229 vlist_flush(&ip->prefix);
1230 interface_write_resolv_conf();
1231 }
1232
1233 void
1234 interface_ip_flush(struct interface_ip_settings *ip)
1235 {
1236 if (ip == &ip->iface->proto_ip)
1237 vlist_flush_all(&ip->iface->host_routes);
1238 vlist_simple_flush_all(&ip->dns_servers);
1239 vlist_simple_flush_all(&ip->dns_search);
1240 vlist_flush_all(&ip->route);
1241 vlist_flush_all(&ip->addr);
1242 vlist_flush_all(&ip->prefix);
1243 }
1244
1245 static void
1246 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1247 {
1248 ip->iface = iface;
1249 ip->enabled = true;
1250 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1251 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1252 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1253 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1254 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1255 }
1256
1257 void
1258 interface_ip_init(struct interface *iface)
1259 {
1260 __interface_ip_init(&iface->proto_ip, iface);
1261 __interface_ip_init(&iface->config_ip, iface);
1262 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1263
1264 }
1265
1266 static void
1267 interface_ip_valid_until_handler(struct uloop_timeout *t)
1268 {
1269 time_t now = system_get_rtime();
1270 struct interface *iface;
1271 vlist_for_each_element(&interfaces, iface, node) {
1272 if (iface->state != IFS_UP)
1273 continue;
1274
1275 struct device_addr *addr, *addrp;
1276 struct device_route *route, *routep;
1277 struct device_prefix *pref, *prefp;
1278
1279 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1280 if (addr->valid_until && addr->valid_until < now)
1281 vlist_delete(&iface->proto_ip.addr, &addr->node);
1282
1283 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1284 if (route->valid_until && route->valid_until < now)
1285 vlist_delete(&iface->proto_ip.route, &route->node);
1286
1287 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1288 if (pref->valid_until && pref->valid_until < now)
1289 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1290
1291 }
1292
1293 uloop_timeout_set(t, 1000);
1294 }
1295
1296 static void __init
1297 interface_ip_init_worker(void)
1298 {
1299 valid_until_timeout.cb = interface_ip_valid_until_handler;
1300 uloop_timeout_set(&valid_until_timeout, 1000);
1301 }
OpenWrt Network interface configuration daemon