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netifd: Route type support
[project/netifd.git] / interface-ip.c
1 /*
2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2012 Steven Barth <steven@midlink.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15 #include <string.h>
16 #include <stdlib.h>
17 #include <stdio.h>
18
19 #include <limits.h>
20 #include <arpa/inet.h>
21 #include <netinet/in.h>
22
23 #include "netifd.h"
24 #include "device.h"
25 #include "interface.h"
26 #include "interface-ip.h"
27 #include "proto.h"
28 #include "ubus.h"
29 #include "system.h"
30
31 enum {
32 ROUTE_INTERFACE,
33 ROUTE_TARGET,
34 ROUTE_MASK,
35 ROUTE_GATEWAY,
36 ROUTE_METRIC,
37 ROUTE_MTU,
38 ROUTE_VALID,
39 ROUTE_TABLE,
40 ROUTE_SOURCE,
41 ROUTE_ONLINK,
42 ROUTE_TYPE,
43 __ROUTE_MAX
44 };
45
46 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
47 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
48 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
49 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
50 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
51 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
52 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
53 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
54 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
55 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
56 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
57 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING }
58 };
59
60 const struct uci_blob_param_list route_attr_list = {
61 .n_params = __ROUTE_MAX,
62 .params = route_attr,
63 };
64
65
66 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
67 static struct device_prefix *ula_prefix = NULL;
68 static struct uloop_timeout valid_until_timeout;
69
70
71 static void
72 clear_if_addr(union if_addr *a, int mask)
73 {
74 int m_bytes = (mask + 7) / 8;
75 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
76 uint8_t *p = (uint8_t *) a;
77
78 if (m_bytes < sizeof(a))
79 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
80
81 p[m_bytes - 1] &= ~m_clear;
82 }
83
84 static bool
85 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
86 {
87 union if_addr *p1, *p2;
88
89 p1 = alloca(sizeof(*a1));
90 p2 = alloca(sizeof(*a2));
91
92 memcpy(p1, a1, sizeof(*a1));
93 clear_if_addr(p1, mask);
94 memcpy(p2, a2, sizeof(*a2));
95 clear_if_addr(p2, mask);
96
97 return !memcmp(p1, p2, sizeof(*p1));
98 }
99
100 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
101 const union if_addr *addr, uint8_t mask, unsigned int table,
102 struct interface *in_iface, const char *action)
103 {
104 struct iprule rule = {
105 .flags = IPRULE_PRIORITY,
106 .priority = priority
107 };
108
109 if (addr) {
110 rule.flags |= IPRULE_SRC;
111 rule.src_addr = *addr;
112 rule.src_mask = mask;
113 }
114
115 if (table) {
116 rule.flags |= IPRULE_LOOKUP;
117 rule.lookup = table;
118
119 if (!rule.lookup)
120 return 0;
121 } else if (action) {
122 rule.flags |= IPRULE_ACTION;
123 system_resolve_iprule_action(action, &rule.action);
124 }
125
126 if (in_iface && in_iface->l3_dev.dev) {
127 rule.flags |= IPRULE_IN;
128 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
129 }
130
131 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
132
133 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
134 }
135
136 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
137 {
138 struct iprule rule = {
139 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
140 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
141 .lookup = (v6) ? iface->ip6table : iface->ip4table,
142 .in_dev = "lo"
143 };
144
145 if (!rule.lookup)
146 return 0;
147
148 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
149
150 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
151 }
152
153 static bool
154 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
155 {
156 struct device_addr *addr;
157
158 vlist_for_each_element(&ip->addr, addr, node) {
159 if (!addr->enabled)
160 continue;
161
162 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
163 continue;
164
165 // Handle offlink addresses correctly
166 unsigned int mask = addr->mask;
167 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
168 (addr->flags & DEVADDR_OFFLINK))
169 mask = 128;
170
171 if (!match_if_addr(&addr->addr, a, mask))
172 continue;
173
174 return true;
175 }
176
177 return false;
178 }
179
180 static void
181 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
182 bool v6, struct device_route **res)
183 {
184 struct device_route *route;
185
186 vlist_for_each_element(&ip->route, route, node) {
187 if (!route->enabled)
188 continue;
189
190 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
191 continue;
192
193 if (!match_if_addr(&route->addr, a, route->mask))
194 continue;
195
196 if (route->flags & DEVROUTE_TABLE)
197 continue;
198
199 if (!*res || route->mask < (*res)->mask)
200 *res = route;
201 }
202 }
203
204 static bool
205 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
206 {
207 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
208 __find_ip_addr_target(&iface->config_ip, a, v6);
209 }
210
211 static void
212 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
213 bool v6, struct device_route **route)
214 {
215 __find_ip_route_target(&iface->proto_ip, a, v6, route);
216 __find_ip_route_target(&iface->config_ip, a, v6, route);
217 }
218
219 struct interface *
220 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
221 {
222 struct device_route *route, *r_next = NULL;
223 bool defaultroute_target = false;
224 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
225
226 route = calloc(1, sizeof(*route));
227 if (!route)
228 return NULL;
229
230 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
231 route->mask = v6 ? 128 : 32;
232 if (memcmp(&route->addr, addr, addrsize) == 0)
233 defaultroute_target = true;
234 else
235 memcpy(&route->addr, addr, addrsize);
236
237 if (iface) {
238 /* look for locally addressable target first */
239 if (interface_ip_find_addr_target(iface, addr, v6))
240 goto done;
241
242 /* do not stop at the first route, let the lookup compare
243 * masks to find the best match */
244 interface_ip_find_route_target(iface, addr, v6, &r_next);
245 } else {
246 vlist_for_each_element(&interfaces, iface, node) {
247 /* look for locally addressable target first */
248 if (interface_ip_find_addr_target(iface, addr, v6))
249 goto done;
250
251 /* do not stop at the first route, let the lookup compare
252 * masks to find the best match */
253 interface_ip_find_route_target(iface, addr, v6, &r_next);
254 }
255 }
256
257 if (!r_next) {
258 free(route);
259 return NULL;
260 }
261
262 iface = r_next->iface;
263 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
264 route->mtu = r_next->mtu;
265 route->metric = r_next->metric;
266 route->table = r_next->table;
267
268 done:
269 route->iface = iface;
270 if (defaultroute_target)
271 free(route);
272 else
273 vlist_add(&iface->host_routes, &route->node, route);
274 return iface;
275 }
276
277 void
278 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
279 {
280 struct interface_ip_settings *ip;
281 struct blob_attr *tb[__ROUTE_MAX], *cur;
282 struct device_route *route;
283 int af = v6 ? AF_INET6 : AF_INET;
284 bool is_proto_route = !!iface;
285
286 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
287
288 if (!iface) {
289 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
290 return;
291
292 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
293 if (!iface)
294 return;
295
296 ip = &iface->config_ip;
297 } else {
298 ip = &iface->proto_ip;
299 }
300
301 route = calloc(1, sizeof(*route));
302 if (!route)
303 return;
304
305 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
306 route->mask = v6 ? 128 : 32;
307 if ((cur = tb[ROUTE_MASK]) != NULL) {
308 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
309 if (route->mask > (v6 ? 128 : 32))
310 goto error;
311 }
312
313 if ((cur = tb[ROUTE_TARGET]) != NULL) {
314 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
315 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
316 goto error;
317 }
318 }
319
320 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
321 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
322 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
323 goto error;
324 }
325 }
326
327 if ((cur = tb[ROUTE_METRIC]) != NULL) {
328 route->metric = blobmsg_get_u32(cur);
329 route->flags |= DEVROUTE_METRIC;
330 } else
331 route->metric = iface->metric;
332
333 if ((cur = tb[ROUTE_MTU]) != NULL) {
334 route->mtu = blobmsg_get_u32(cur);
335 route->flags |= DEVROUTE_MTU;
336 }
337
338 // Use source-based routing
339 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
340 char *saveptr, *source = alloca(blobmsg_data_len(cur));
341 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
342
343 const char *addr = strtok_r(source, "/", &saveptr);
344 const char *mask = strtok_r(NULL, "/", &saveptr);
345
346 if (!addr || inet_pton(af, addr, &route->source) < 1) {
347 DPRINTF("Failed to parse route source: %s\n", addr);
348 goto error;
349 }
350
351 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
352 }
353
354 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
355 route->flags |= DEVROUTE_ONLINK;
356
357 if (is_proto_route) {
358 route->table = (v6) ? iface->ip6table : iface->ip4table;
359 route->flags |= DEVROUTE_SRCTABLE;
360 }
361
362 if ((cur = tb[ROUTE_TABLE]) != NULL) {
363 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
364 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
365 goto error;
366 }
367
368 if (route->table)
369 route->flags |= DEVROUTE_TABLE;
370 }
371
372 if ((cur = tb[ROUTE_VALID]) != NULL) {
373 int64_t valid = blobmsg_get_u32(cur);
374 int64_t valid_until = valid + (int64_t)system_get_rtime();
375 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
376 route->valid_until = valid_until;
377 }
378
379 if ((cur = tb[ROUTE_TYPE]) != NULL) {
380 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
381 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
382 goto error;
383 }
384 route->flags |= DEVROUTE_TYPE;
385 }
386
387 vlist_add(&ip->route, &route->node, route);
388 return;
389
390 error:
391 free(route);
392 }
393
394 static int
395 addr_cmp(const void *k1, const void *k2, void *ptr)
396 {
397 return memcmp(k1, k2, sizeof(struct device_addr) -
398 offsetof(struct device_addr, flags));
399 }
400
401 static int
402 route_cmp(const void *k1, const void *k2, void *ptr)
403 {
404 const struct device_route *r1 = k1, *r2 = k2;
405
406 if (r1->mask != r2->mask)
407 return r2->mask - r1->mask;
408
409 if (r1->metric != r2->metric)
410 return r1->metric - r2->metric;
411
412 if (r1->flags != r2->flags)
413 return r2->flags - r1->flags;
414
415 if (r1->sourcemask != r2->sourcemask)
416 return r1->sourcemask - r2->sourcemask;
417
418 if (r1->table != r2->table)
419 return r1->table - r2->table;
420
421 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
422 if (maskcmp)
423 return maskcmp;
424
425 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
426 }
427
428 static int
429 prefix_cmp(const void *k1, const void *k2, void *ptr)
430 {
431 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
432 offsetof(struct device_prefix, addr));
433 }
434
435 static void
436 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
437 {
438 struct device *dev = iface->l3_dev.dev;
439 struct device_route route;
440
441 memset(&route, 0, sizeof(route));
442 route.iface = iface;
443 route.flags = addr->flags;
444 route.mask = addr->mask;
445 memcpy(&route.addr, &addr->addr, sizeof(route.addr));
446 clear_if_addr(&route.addr, route.mask);
447
448 if (add) {
449 route.flags |= DEVADDR_KERNEL;
450 system_del_route(dev, &route);
451
452 if (!(addr->flags & DEVADDR_OFFLINK)) {
453 route.flags &= ~DEVADDR_KERNEL;
454 route.metric = iface->metric;
455 system_add_route(dev, &route);
456 }
457 } else {
458 if (!(addr->flags & DEVADDR_OFFLINK))
459 system_del_route(dev, &route);
460 }
461 }
462
463 static void
464 interface_update_proto_addr(struct vlist_tree *tree,
465 struct vlist_node *node_new,
466 struct vlist_node *node_old)
467 {
468 struct interface_ip_settings *ip;
469 struct interface *iface;
470 struct device *dev;
471 struct device_addr *a_new = NULL, *a_old = NULL;
472 bool replace = false;
473 bool keep = false;
474 bool v6 = false;
475
476 ip = container_of(tree, struct interface_ip_settings, addr);
477 iface = ip->iface;
478 dev = iface->l3_dev.dev;
479
480 if (!node_new || !node_old)
481 iface->updated |= IUF_ADDRESS;
482
483 if (node_new) {
484 a_new = container_of(node_new, struct device_addr, node);
485
486 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
487 !a_new->broadcast) {
488
489 uint32_t mask = ~0;
490 uint32_t *a = (uint32_t *) &a_new->addr;
491
492 mask >>= a_new->mask;
493 a_new->broadcast = *a | htonl(mask);
494 }
495 }
496
497 if (node_old)
498 a_old = container_of(node_old, struct device_addr, node);
499
500 if (a_new && a_old) {
501 keep = true;
502
503 if (a_old->flags != a_new->flags || a_old->failed)
504 keep = false;
505
506 if (a_old->valid_until != a_new->valid_until ||
507 a_old->preferred_until != a_new->preferred_until)
508 replace = true;
509
510 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
511 a_new->broadcast != a_old->broadcast)
512 keep = false;
513 }
514
515 if (node_old) {
516 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
517 interface_handle_subnet_route(iface, a_old, false);
518
519 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
520 v6 = true;
521
522 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
523
524 //This is needed for source routing to work correctly. If a device
525 //has two connections to a network using the same subnet, adding
526 //only the network-rule will cause packets to be routed through the
527 //first matching network (source IP matches both masks).
528 if (table) {
529 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
530 (v6) ? 128 : 32, table, NULL, NULL);
531 set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
532 a_old->mask, table, NULL, NULL);
533 }
534
535 system_del_address(dev, a_old);
536 }
537 free(a_old->pclass);
538 free(a_old);
539 }
540
541 if (node_new) {
542 a_new->enabled = true;
543 if (!(a_new->flags & DEVADDR_EXTERNAL) && (!keep || replace)) {
544 if (system_add_address(dev, a_new))
545 a_new->failed = true;
546
547 if (!keep) {
548 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
549 v6 = true;
550
551 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
552
553 if (table) {
554 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
555 (v6) ? 128 : 32, table, NULL, NULL);
556 set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
557 a_new->mask, table, NULL, NULL);
558 }
559 }
560
561 if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
562 interface_handle_subnet_route(iface, a_new, true);
563 }
564 }
565 }
566
567 static bool
568 enable_route(struct interface_ip_settings *ip, struct device_route *route)
569 {
570 if (ip->no_defaultroute && !route->mask)
571 return false;
572
573 return ip->enabled;
574 }
575
576 static void
577 interface_update_proto_route(struct vlist_tree *tree,
578 struct vlist_node *node_new,
579 struct vlist_node *node_old)
580 {
581 struct interface_ip_settings *ip;
582 struct interface *iface;
583 struct device *dev;
584 struct device_route *route_old, *route_new;
585 bool keep = false;
586
587 ip = container_of(tree, struct interface_ip_settings, route);
588 iface = ip->iface;
589 dev = iface->l3_dev.dev;
590
591 if (!node_new || !node_old)
592 iface->updated |= IUF_ROUTE;
593
594 route_old = container_of(node_old, struct device_route, node);
595 route_new = container_of(node_new, struct device_route, node);
596
597 if (node_old && node_new)
598 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
599 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
600 !route_old->failed;
601
602 if (node_old) {
603 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
604 system_del_route(dev, route_old);
605
606 free(route_old);
607 }
608
609 if (node_new) {
610 bool _enabled = enable_route(ip, route_new);
611
612 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
613 if (system_add_route(dev, route_new))
614 route_new->failed = true;
615
616 route_new->iface = iface;
617 route_new->enabled = _enabled;
618 }
619 }
620
621 static void
622 interface_update_host_route(struct vlist_tree *tree,
623 struct vlist_node *node_new,
624 struct vlist_node *node_old)
625 {
626 struct interface *iface;
627 struct device *dev;
628 struct device_route *route_old, *route_new;
629
630 iface = container_of(tree, struct interface, host_routes);
631 dev = iface->l3_dev.dev;
632
633 route_old = container_of(node_old, struct device_route, node);
634 route_new = container_of(node_new, struct device_route, node);
635
636 if (node_old) {
637 system_del_route(dev, route_old);
638 free(route_old);
639 }
640
641 if (node_new) {
642 if (system_add_route(dev, route_new))
643 route_new->failed = true;
644 }
645 }
646
647
648 static void
649 interface_set_prefix_address(struct device_prefix_assignment *assignment,
650 const struct device_prefix *prefix, struct interface *iface, bool add)
651 {
652 const struct interface *uplink = prefix->iface;
653 if (!iface->l3_dev.dev)
654 return;
655
656 struct device *l3_downlink = iface->l3_dev.dev;
657
658 struct device_addr addr;
659 memset(&addr, 0, sizeof(addr));
660 addr.addr.in6 = prefix->addr;
661 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
662 addr.addr.in6.s6_addr[15] += 1;
663 addr.mask = assignment->length;
664 addr.flags = DEVADDR_INET6;
665 addr.preferred_until = prefix->preferred_until;
666 addr.valid_until = prefix->valid_until;
667
668 if (!add && assignment->enabled) {
669 time_t now = system_get_rtime();
670 addr.preferred_until = now;
671 if (!addr.valid_until || addr.valid_until - now > 7200)
672 addr.valid_until = now + 7200;
673 system_del_address(l3_downlink, &addr); // Work around dangling prefix routes
674 system_add_address(l3_downlink, &addr);
675 if (prefix->iface) {
676 if (prefix->iface->ip6table)
677 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
678 addr.mask, prefix->iface->ip6table, iface, NULL);
679
680 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
681 addr.mask, 0, iface, "unreachable");
682 }
683
684 assignment->enabled = false;
685 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
686 !system_add_address(l3_downlink, &addr)) {
687 if (prefix->iface && !assignment->enabled) {
688 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
689 addr.mask, 0, iface, "unreachable");
690
691 if (prefix->iface->ip6table)
692 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
693 addr.mask, prefix->iface->ip6table, iface, NULL);
694 }
695 if (uplink && uplink->l3_dev.dev) {
696 int mtu = system_update_ipv6_mtu(
697 uplink->l3_dev.dev, 0);
698 if (mtu > 0)
699 system_update_ipv6_mtu(l3_downlink, mtu);
700 }
701 assignment->enabled = true;
702 }
703 }
704
705 static bool interface_prefix_assign(struct list_head *list,
706 struct device_prefix_assignment *assign)
707 {
708 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
709 struct device_prefix_assignment *c;
710 list_for_each_entry(c, list, head) {
711 if (assign->assigned != -1) {
712 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
713 list_add_tail(&assign->head, &c->head);
714 return true;
715 }
716 } else if (assign->assigned == -1) {
717 current = (current + asize) & (~asize);
718 if (current + asize < c->assigned) {
719 assign->assigned = current;
720 list_add_tail(&assign->head, &c->head);
721 return true;
722 }
723 }
724 current = (c->assigned + (1 << (64 - c->length)));
725 }
726 return false;
727 }
728
729 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
730 {
731 struct device_prefix_assignment *c;
732 struct interface *iface;
733
734 // Delete all assignments
735 while (!list_empty(&prefix->assignments)) {
736 c = list_first_entry(&prefix->assignments,
737 struct device_prefix_assignment, head);
738 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
739 interface_set_prefix_address(c, prefix, iface, false);
740 list_del(&c->head);
741 free(c);
742 }
743
744 if (!setup)
745 return;
746
747 // End-of-assignment sentinel
748 c = malloc(sizeof(*c) + 1);
749 c->assigned = 1 << (64 - prefix->length);
750 c->length = 64;
751 c->name[0] = 0;
752 list_add(&c->head, &prefix->assignments);
753
754 // Excluded prefix
755 if (prefix->excl_length > 0) {
756 const char name[] = "!excluded";
757 c = malloc(sizeof(*c) + sizeof(name));
758 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
759 ((1 << (64 - prefix->length)) - 1);
760 c->length = prefix->excl_length;
761 memcpy(c->name, name, sizeof(name));
762 list_add(&c->head, &prefix->assignments);
763 }
764
765 bool assigned_any = false;
766 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
767 vlist_for_each_element(&interfaces, iface, node) {
768 if (iface->assignment_length < 48 ||
769 iface->assignment_length > 64)
770 continue;
771
772 // Test whether there is a matching class
773 if (!list_empty(&iface->assignment_classes)) {
774 bool found = false;
775
776 struct interface_assignment_class *c;
777 list_for_each_entry(c, &iface->assignment_classes, head) {
778 if (!strcmp(c->name, prefix->pclass)) {
779 found = true;
780 break;
781 }
782 }
783
784 if (!found)
785 continue;
786 }
787
788 size_t namelen = strlen(iface->name) + 1;
789 c = malloc(sizeof(*c) + namelen);
790 c->length = iface->assignment_length;
791 c->assigned = iface->assignment_hint;
792 c->enabled = false;
793 memcpy(c->name, iface->name, namelen);
794
795 // First process all custom assignments, put all others in later-list
796 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
797 if (c->assigned != -1) {
798 c->assigned = -1;
799 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
800 "of size %hhu for %s, trying other\n", c->length, c->name);
801 }
802
803 struct list_head *next = &assign_later;
804 struct device_prefix_assignment *n;
805 list_for_each_entry(n, &assign_later, head) {
806 if (n->length < c->length) {
807 next = &n->head;
808 break;
809 }
810 }
811 list_add_tail(&c->head, next);
812 }
813
814 if (c->assigned != -1)
815 assigned_any = true;
816 }
817
818 // Then try to assign all other + failed custom assignments
819 while (!list_empty(&assign_later)) {
820 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
821 list_del(&c->head);
822
823 bool assigned = false;
824 do {
825 assigned = interface_prefix_assign(&prefix->assignments, c);
826 } while (!assigned && ++c->length <= 64);
827
828 if (!assigned) {
829 netifd_log_message(L_WARNING, "Failed to assign subprefix "
830 "of size %hhu for %s\n", c->length, c->name);
831 free(c);
832 } else {
833 assigned_any = true;
834 }
835 }
836
837 list_for_each_entry(c, &prefix->assignments, head)
838 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
839 interface_set_prefix_address(c, prefix, iface, true);
840
841 if (!assigned_any)
842 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
843 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
844 }
845
846
847 void interface_refresh_assignments(bool hint)
848 {
849 static bool refresh = false;
850 if (!hint && refresh) {
851 struct device_prefix *p;
852 list_for_each_entry(p, &prefixes, head)
853 interface_update_prefix_assignments(p, true);
854 }
855 refresh = hint;
856 }
857
858
859 static void
860 interface_update_prefix(struct vlist_tree *tree,
861 struct vlist_node *node_new,
862 struct vlist_node *node_old)
863 {
864 struct device_prefix *prefix_old, *prefix_new;
865 prefix_old = container_of(node_old, struct device_prefix, node);
866 prefix_new = container_of(node_new, struct device_prefix, node);
867
868 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
869 if (tree && (!node_new || !node_old))
870 ip->iface->updated |= IUF_PREFIX;
871
872 struct device_route route;
873 memset(&route, 0, sizeof(route));
874 route.flags = DEVADDR_INET6;
875 route.metric = INT32_MAX;
876 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
877 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
878
879
880 struct device_prefix_assignment *c;
881 struct interface *iface;
882
883 if (node_old && node_new) {
884 // Move assignments and refresh addresses to update valid times
885 list_splice(&prefix_old->assignments, &prefix_new->assignments);
886
887 list_for_each_entry(c, &prefix_new->assignments, head)
888 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
889 interface_set_prefix_address(c, prefix_new, iface, true);
890 } else if (node_new) {
891 // Set null-route to avoid routing loops
892 system_add_route(NULL, &route);
893
894 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
895 interface_update_prefix_assignments(prefix_new, true);
896 } else if (node_old) {
897 // Remove null-route
898 interface_update_prefix_assignments(prefix_old, false);
899 system_del_route(NULL, &route);
900 }
901
902 if (node_old) {
903 if (prefix_old->head.next)
904 list_del(&prefix_old->head);
905 free(prefix_old);
906 }
907
908 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
909 list_add(&prefix_new->head, &prefixes);
910
911 }
912
913 struct device_prefix*
914 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
915 uint8_t length, time_t valid_until, time_t preferred_until,
916 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
917 {
918 if (!pclass)
919 pclass = (iface) ? iface->name : "local";
920
921 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
922 prefix->length = length;
923 prefix->addr = *addr;
924 prefix->preferred_until = preferred_until;
925 prefix->valid_until = valid_until;
926 prefix->iface = iface;
927 INIT_LIST_HEAD(&prefix->assignments);
928
929 if (excl_addr) {
930 prefix->excl_addr = *excl_addr;
931 prefix->excl_length = excl_length;
932 }
933
934 strcpy(prefix->pclass, pclass);
935
936 if (iface)
937 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
938 else
939 interface_update_prefix(NULL, &prefix->node, NULL);
940
941 return prefix;
942 }
943
944 void
945 interface_ip_set_ula_prefix(const char *prefix)
946 {
947 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
948 if (prefix)
949 strncpy(buf, prefix, sizeof(buf) - 1);
950 char *prefixaddr = strtok_r(buf, "/", &saveptr);
951
952 struct in6_addr addr;
953 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
954 if (ula_prefix) {
955 interface_update_prefix(NULL, NULL, &ula_prefix->node);
956 ula_prefix = NULL;
957 }
958 return;
959 }
960
961 int length;
962 char *prefixlen = strtok_r(NULL, ",", &saveptr);
963 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
964 return;
965
966 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
967 ula_prefix->length != length) {
968 if (ula_prefix)
969 interface_update_prefix(NULL, NULL, &ula_prefix->node);
970
971 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
972 0, 0, NULL, 0, NULL);
973 }
974 }
975
976 void
977 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
978 {
979 struct dns_server *s;
980
981 s = calloc(1, sizeof(*s));
982 if (!s)
983 return;
984
985 s->af = AF_INET;
986 if (inet_pton(s->af, str, &s->addr.in))
987 goto add;
988
989 s->af = AF_INET6;
990 if (inet_pton(s->af, str, &s->addr.in))
991 goto add;
992
993 free(s);
994 return;
995
996 add:
997 D(INTERFACE, "Add IPv%c DNS server: %s\n",
998 s->af == AF_INET6 ? '6' : '4', str);
999 vlist_simple_add(&ip->dns_servers, &s->node);
1000 }
1001
1002 void
1003 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1004 {
1005 struct blob_attr *cur;
1006 int rem;
1007
1008 blobmsg_for_each_attr(cur, list, rem) {
1009 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1010 continue;
1011
1012 if (!blobmsg_check_attr(cur, NULL))
1013 continue;
1014
1015 interface_add_dns_server(ip, blobmsg_data(cur));
1016 }
1017 }
1018
1019 static void
1020 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1021 {
1022 struct dns_search_domain *s;
1023 int len = strlen(str);
1024
1025 s = calloc(1, sizeof(*s) + len + 1);
1026 if (!s)
1027 return;
1028
1029 D(INTERFACE, "Add DNS search domain: %s\n", str);
1030 memcpy(s->name, str, len);
1031 vlist_simple_add(&ip->dns_search, &s->node);
1032 }
1033
1034 void
1035 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1036 {
1037 struct blob_attr *cur;
1038 int rem;
1039
1040 blobmsg_for_each_attr(cur, list, rem) {
1041 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1042 continue;
1043
1044 if (!blobmsg_check_attr(cur, NULL))
1045 continue;
1046
1047 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1048 }
1049 }
1050
1051 static void
1052 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1053 {
1054 struct dns_server *s;
1055 struct dns_search_domain *d;
1056 const char *str;
1057 char buf[INET6_ADDRSTRLEN];
1058
1059 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1060 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1061 if (!str)
1062 continue;
1063
1064 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1065 fprintf(f, "nameserver %s%%%s\n", str, dev);
1066 else
1067 fprintf(f, "nameserver %s\n", str);
1068 }
1069
1070 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1071 fprintf(f, "search %s\n", d->name);
1072 }
1073 }
1074
1075 void
1076 interface_write_resolv_conf(void)
1077 {
1078 struct interface *iface;
1079 char *path = alloca(strlen(resolv_conf) + 5);
1080 FILE *f;
1081 uint32_t crcold, crcnew;
1082
1083 sprintf(path, "%s.tmp", resolv_conf);
1084 unlink(path);
1085 f = fopen(path, "w+");
1086 if (!f) {
1087 D(INTERFACE, "Failed to open %s for writing\n", path);
1088 return;
1089 }
1090
1091 vlist_for_each_element(&interfaces, iface, node) {
1092 if (iface->state != IFS_UP)
1093 continue;
1094
1095 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1096 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1097 vlist_simple_empty(&iface->config_ip.dns_search) &&
1098 vlist_simple_empty(&iface->config_ip.dns_servers))
1099 continue;
1100
1101 fprintf(f, "# Interface %s\n", iface->name);
1102 write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
1103 if (!iface->proto_ip.no_dns)
1104 write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
1105 }
1106 fflush(f);
1107 rewind(f);
1108 crcnew = crc32_file(f);
1109 fclose(f);
1110
1111 crcold = crcnew + 1;
1112 f = fopen(resolv_conf, "r");
1113 if (f) {
1114 crcold = crc32_file(f);
1115 fclose(f);
1116 }
1117
1118 if (crcold == crcnew) {
1119 unlink(path);
1120 } else if (rename(path, resolv_conf) < 0) {
1121 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1122 unlink(path);
1123 }
1124 }
1125
1126 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1127 {
1128 struct device_addr *addr;
1129 struct device_route *route;
1130 struct device *dev;
1131
1132 ip->enabled = enabled;
1133 dev = ip->iface->l3_dev.dev;
1134 if (!dev)
1135 return;
1136
1137 vlist_for_each_element(&ip->addr, addr, node) {
1138 if (addr->enabled == enabled)
1139 continue;
1140
1141 if (enabled)
1142 system_add_address(dev, addr);
1143 else
1144 system_del_address(dev, addr);
1145 addr->enabled = enabled;
1146 }
1147
1148 vlist_for_each_element(&ip->route, route, node) {
1149 bool _enabled = enabled;
1150
1151 if (!enable_route(ip, route))
1152 _enabled = false;
1153
1154 if (route->enabled == _enabled)
1155 continue;
1156
1157 if (_enabled) {
1158 if (!(route->flags & DEVROUTE_METRIC))
1159 route->metric = ip->iface->metric;
1160
1161 if (system_add_route(dev, route))
1162 route->failed = true;
1163 } else
1164 system_del_route(dev, route);
1165 route->enabled = _enabled;
1166 }
1167
1168 struct device_prefix *c;
1169 struct device_prefix_assignment *a;
1170 list_for_each_entry(c, &prefixes, head)
1171 list_for_each_entry(a, &c->assignments, head)
1172 if (!strcmp(a->name, ip->iface->name))
1173 interface_set_prefix_address(a, c, ip->iface, enabled);
1174
1175 if (ip->iface && ip->iface->l3_dev.dev) {
1176 set_ip_lo_policy(enabled, true, ip->iface);
1177 set_ip_lo_policy(enabled, false, ip->iface);
1178
1179 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1180 NULL, 0, 0, ip->iface, "failed_policy");
1181 }
1182 }
1183
1184 void
1185 interface_ip_update_start(struct interface_ip_settings *ip)
1186 {
1187 if (ip != &ip->iface->config_ip) {
1188 vlist_simple_update(&ip->dns_servers);
1189 vlist_simple_update(&ip->dns_search);
1190 }
1191 vlist_update(&ip->route);
1192 vlist_update(&ip->addr);
1193 vlist_update(&ip->prefix);
1194 }
1195
1196 void
1197 interface_ip_update_complete(struct interface_ip_settings *ip)
1198 {
1199 vlist_simple_flush(&ip->dns_servers);
1200 vlist_simple_flush(&ip->dns_search);
1201 vlist_flush(&ip->route);
1202 vlist_flush(&ip->addr);
1203 vlist_flush(&ip->prefix);
1204 interface_write_resolv_conf();
1205 }
1206
1207 void
1208 interface_ip_flush(struct interface_ip_settings *ip)
1209 {
1210 if (ip == &ip->iface->proto_ip)
1211 vlist_flush_all(&ip->iface->host_routes);
1212 vlist_simple_flush_all(&ip->dns_servers);
1213 vlist_simple_flush_all(&ip->dns_search);
1214 vlist_flush_all(&ip->route);
1215 vlist_flush_all(&ip->addr);
1216 vlist_flush_all(&ip->prefix);
1217 }
1218
1219 static void
1220 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1221 {
1222 ip->iface = iface;
1223 ip->enabled = true;
1224 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1225 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1226 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1227 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1228 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1229 }
1230
1231 void
1232 interface_ip_init(struct interface *iface)
1233 {
1234 __interface_ip_init(&iface->proto_ip, iface);
1235 __interface_ip_init(&iface->config_ip, iface);
1236 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1237 }
1238
1239 static void
1240 interface_ip_valid_until_handler(struct uloop_timeout *t)
1241 {
1242 time_t now = system_get_rtime();
1243 struct interface *iface;
1244 vlist_for_each_element(&interfaces, iface, node) {
1245 if (iface->state != IFS_UP)
1246 continue;
1247
1248 struct device_addr *addr, *addrp;
1249 struct device_route *route, *routep;
1250 struct device_prefix *pref, *prefp;
1251
1252 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1253 if (addr->valid_until && addr->valid_until < now)
1254 vlist_delete(&iface->proto_ip.addr, &addr->node);
1255
1256 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1257 if (route->valid_until && route->valid_until < now)
1258 vlist_delete(&iface->proto_ip.route, &route->node);
1259
1260 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1261 if (pref->valid_until && pref->valid_until < now)
1262 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1263
1264 }
1265
1266 uloop_timeout_set(t, 1000);
1267 }
1268
1269 static void __init
1270 interface_ip_init_worker(void)
1271 {
1272 valid_until_timeout.cb = interface_ip_valid_until_handler;
1273 uloop_timeout_set(&valid_until_timeout, 1000);
1274 }
OpenWrt Network interface configuration daemon