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