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Add support for onlink-flags for IPv4 routes
[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_MAX
43 };
44
45 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
46 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
47 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
48 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
49 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
50 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
51 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
52 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
53 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
54 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
55 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
56 };
57
58 const struct uci_blob_param_list route_attr_list = {
59 .n_params = __ROUTE_MAX,
60 .params = route_attr,
61 };
62
63
64 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
65 static struct device_prefix *ula_prefix = NULL;
66 static struct uloop_timeout valid_until_timeout;
67
68
69 static void
70 clear_if_addr(union if_addr *a, int mask)
71 {
72 int m_bytes = (mask + 7) / 8;
73 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
74 uint8_t *p = (uint8_t *) a;
75
76 if (m_bytes < sizeof(a))
77 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
78
79 p[m_bytes - 1] &= ~m_clear;
80 }
81
82 static bool
83 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
84 {
85 union if_addr *p1, *p2;
86
87 p1 = alloca(sizeof(*a1));
88 p2 = alloca(sizeof(*a2));
89
90 memcpy(p1, a1, sizeof(*a1));
91 clear_if_addr(p1, mask);
92 memcpy(p2, a2, sizeof(*a2));
93 clear_if_addr(p2, mask);
94
95 return !memcmp(p1, p2, sizeof(*p1));
96 }
97
98 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
99 const union if_addr *addr, uint8_t mask, unsigned int table,
100 struct interface *in_iface, const char *action)
101 {
102 struct iprule rule = {
103 .flags = IPRULE_PRIORITY,
104 .priority = priority
105 };
106
107 if (addr) {
108 rule.flags |= IPRULE_SRC;
109 rule.src_addr = *addr;
110 rule.src_mask = mask;
111 }
112
113 if (table) {
114 rule.flags |= IPRULE_LOOKUP;
115 rule.lookup = table;
116
117 if (!rule.lookup)
118 return 0;
119 } else if (action) {
120 rule.flags |= IPRULE_ACTION;
121 system_resolve_iprule_action(action, &rule.action);
122 }
123
124 if (in_iface && in_iface->l3_dev.dev) {
125 rule.flags |= IPRULE_IN;
126 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
127 }
128
129 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
130
131 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
132 }
133
134 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
135 {
136 struct iprule rule = {
137 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
138 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
139 .lookup = (v6) ? iface->ip6table : iface->ip4table,
140 .in_dev = "lo"
141 };
142
143 if (!rule.lookup)
144 return 0;
145
146 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
147
148 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
149 }
150
151 static bool
152 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
153 {
154 struct device_addr *addr;
155
156 vlist_for_each_element(&ip->addr, addr, node) {
157 if (!addr->enabled)
158 continue;
159
160 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
161 continue;
162
163 // Handle offlink addresses correctly
164 unsigned int mask = addr->mask;
165 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
166 (addr->flags & DEVADDR_OFFLINK))
167 mask = 128;
168
169 if (!match_if_addr(&addr->addr, a, mask))
170 continue;
171
172 return true;
173 }
174
175 return false;
176 }
177
178 static void
179 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
180 bool v6, struct device_route **res)
181 {
182 struct device_route *route;
183
184 vlist_for_each_element(&ip->route, route, node) {
185 if (!route->enabled)
186 continue;
187
188 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
189 continue;
190
191 if (!match_if_addr(&route->addr, a, route->mask))
192 continue;
193
194 if (route->flags & DEVROUTE_TABLE)
195 continue;
196
197 if (!*res || route->mask < (*res)->mask)
198 *res = route;
199 }
200 }
201
202 static bool
203 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
204 {
205 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
206 __find_ip_addr_target(&iface->config_ip, a, v6);
207 }
208
209 static void
210 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
211 bool v6, struct device_route **route)
212 {
213 __find_ip_route_target(&iface->proto_ip, a, v6, route);
214 __find_ip_route_target(&iface->config_ip, a, v6, route);
215 }
216
217 struct interface *
218 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
219 {
220 struct device_route *route, *r_next = NULL;
221 bool defaultroute_target = false;
222 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
223
224 route = calloc(1, sizeof(*route));
225 if (!route)
226 return NULL;
227
228 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
229 route->mask = v6 ? 128 : 32;
230 if (memcmp(&route->addr, addr, addrsize) == 0)
231 defaultroute_target = true;
232 else
233 memcpy(&route->addr, addr, addrsize);
234
235 if (iface) {
236 /* look for locally addressable target first */
237 if (interface_ip_find_addr_target(iface, addr, v6))
238 goto done;
239
240 /* do not stop at the first route, let the lookup compare
241 * masks to find the best match */
242 interface_ip_find_route_target(iface, addr, v6, &r_next);
243 } else {
244 vlist_for_each_element(&interfaces, iface, node) {
245 /* look for locally addressable target first */
246 if (interface_ip_find_addr_target(iface, addr, v6))
247 goto done;
248
249 /* do not stop at the first route, let the lookup compare
250 * masks to find the best match */
251 interface_ip_find_route_target(iface, addr, v6, &r_next);
252 }
253 }
254
255 if (!r_next) {
256 free(route);
257 return NULL;
258 }
259
260 iface = r_next->iface;
261 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
262 route->mtu = r_next->mtu;
263 route->metric = r_next->metric;
264 route->table = r_next->table;
265
266 done:
267 route->iface = iface;
268 if (defaultroute_target)
269 free(route);
270 else
271 vlist_add(&iface->host_routes, &route->node, route);
272 return iface;
273 }
274
275 void
276 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
277 {
278 struct interface_ip_settings *ip;
279 struct blob_attr *tb[__ROUTE_MAX], *cur;
280 struct device_route *route;
281 int af = v6 ? AF_INET6 : AF_INET;
282 bool is_proto_route = !!iface;
283
284 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
285
286 if (!iface) {
287 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
288 return;
289
290 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
291 if (!iface)
292 return;
293
294 ip = &iface->config_ip;
295 } else {
296 ip = &iface->proto_ip;
297 }
298
299 route = calloc(1, sizeof(*route));
300 if (!route)
301 return;
302
303 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
304 route->mask = v6 ? 128 : 32;
305 if ((cur = tb[ROUTE_MASK]) != NULL) {
306 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
307 if (route->mask > (v6 ? 128 : 32))
308 goto error;
309 }
310
311 if ((cur = tb[ROUTE_TARGET]) != NULL) {
312 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
313 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
314 goto error;
315 }
316 }
317
318 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
319 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
320 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
321 goto error;
322 }
323 }
324
325 if ((cur = tb[ROUTE_METRIC]) != NULL) {
326 route->metric = blobmsg_get_u32(cur);
327 route->flags |= DEVROUTE_METRIC;
328 } else
329 route->metric = iface->metric;
330
331 if ((cur = tb[ROUTE_MTU]) != NULL) {
332 route->mtu = blobmsg_get_u32(cur);
333 route->flags |= DEVROUTE_MTU;
334 }
335
336 // Use source-based routing
337 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
338 char *saveptr, *source = alloca(blobmsg_data_len(cur));
339 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
340
341 const char *addr = strtok_r(source, "/", &saveptr);
342 const char *mask = strtok_r(NULL, "/", &saveptr);
343
344 if (!addr || inet_pton(af, addr, &route->source) < 1) {
345 DPRINTF("Failed to parse route source: %s\n", addr);
346 goto error;
347 }
348
349 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
350 }
351
352 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
353 route->flags |= DEVROUTE_ONLINK;
354
355 if (is_proto_route) {
356 route->table = (v6) ? iface->ip6table : iface->ip4table;
357 route->flags |= DEVROUTE_SRCTABLE;
358 }
359
360 if ((cur = tb[ROUTE_TABLE]) != NULL) {
361 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
362 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
363 goto error;
364 }
365
366 if (route->table)
367 route->flags |= DEVROUTE_TABLE;
368 }
369
370 if ((cur = tb[ROUTE_VALID]) != NULL) {
371 int64_t valid = blobmsg_get_u32(cur);
372 int64_t valid_until = valid + (int64_t)system_get_rtime();
373 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
374 route->valid_until = valid_until;
375 }
376
377 vlist_add(&ip->route, &route->node, route);
378 return;
379
380 error:
381 free(route);
382 }
383
384 static int
385 addr_cmp(const void *k1, const void *k2, void *ptr)
386 {
387 return memcmp(k1, k2, sizeof(struct device_addr) -
388 offsetof(struct device_addr, flags));
389 }
390
391 static int
392 route_cmp(const void *k1, const void *k2, void *ptr)
393 {
394 const struct device_route *r1 = k1, *r2 = k2;
395
396 if (r1->mask != r2->mask)
397 return r2->mask - r1->mask;
398
399 if (r1->metric != r2->metric)
400 return r1->metric - r2->metric;
401
402 if (r1->flags != r2->flags)
403 return r2->flags - r1->flags;
404
405 if (r1->sourcemask != r2->sourcemask)
406 return r1->sourcemask - r2->sourcemask;
407
408 if (r1->table != r2->table)
409 return r1->table - r2->table;
410
411 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
412 if (maskcmp)
413 return maskcmp;
414
415 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
416 }
417
418 static int
419 prefix_cmp(const void *k1, const void *k2, void *ptr)
420 {
421 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
422 offsetof(struct device_prefix, addr));
423 }
424
425 static void
426 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
427 {
428 struct device *dev = iface->l3_dev.dev;
429 struct device_route route;
430
431 memset(&route, 0, sizeof(route));
432 route.iface = iface;
433 route.flags = addr->flags;
434 route.mask = addr->mask;
435 memcpy(&route.addr, &addr->addr, sizeof(route.addr));
436 clear_if_addr(&route.addr, route.mask);
437
438 if (add) {
439 route.flags |= DEVADDR_KERNEL;
440 system_del_route(dev, &route);
441
442 if (!(addr->flags & DEVADDR_OFFLINK)) {
443 route.flags &= ~DEVADDR_KERNEL;
444 route.metric = iface->metric;
445 system_add_route(dev, &route);
446 }
447 } else {
448 if (!(addr->flags & DEVADDR_OFFLINK))
449 system_del_route(dev, &route);
450 }
451 }
452
453 static void
454 interface_update_proto_addr(struct vlist_tree *tree,
455 struct vlist_node *node_new,
456 struct vlist_node *node_old)
457 {
458 struct interface_ip_settings *ip;
459 struct interface *iface;
460 struct device *dev;
461 struct device_addr *a_new = NULL, *a_old = NULL;
462 bool replace = false;
463 bool keep = false;
464 bool v6 = false;
465
466 ip = container_of(tree, struct interface_ip_settings, addr);
467 iface = ip->iface;
468 dev = iface->l3_dev.dev;
469
470 if (!node_new || !node_old)
471 iface->updated |= IUF_ADDRESS;
472
473 if (node_new) {
474 a_new = container_of(node_new, struct device_addr, node);
475
476 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
477 !a_new->broadcast) {
478
479 uint32_t mask = ~0;
480 uint32_t *a = (uint32_t *) &a_new->addr;
481
482 mask >>= a_new->mask;
483 a_new->broadcast = *a | htonl(mask);
484 }
485 }
486
487 if (node_old)
488 a_old = container_of(node_old, struct device_addr, node);
489
490 if (a_new && a_old) {
491 keep = true;
492
493 if (a_old->flags != a_new->flags || a_old->failed)
494 keep = false;
495
496 if (a_old->valid_until != a_new->valid_until ||
497 a_old->preferred_until != a_new->preferred_until)
498 replace = true;
499
500 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
501 a_new->broadcast != a_old->broadcast)
502 keep = false;
503 }
504
505 if (node_old) {
506 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
507 interface_handle_subnet_route(iface, a_old, false);
508
509 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
510 v6 = true;
511
512 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
513
514 //This is needed for source routing to work correctly. If a device
515 //has two connections to a network using the same subnet, adding
516 //only the network-rule will cause packets to be routed through the
517 //first matching network (source IP matches both masks).
518 if (table) {
519 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
520 (v6) ? 128 : 32, table, NULL, NULL);
521 set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
522 a_old->mask, table, NULL, NULL);
523 }
524
525 system_del_address(dev, a_old);
526 }
527 free(a_old->pclass);
528 free(a_old);
529 }
530
531 if (node_new) {
532 a_new->enabled = true;
533 if (!(a_new->flags & DEVADDR_EXTERNAL) && (!keep || replace)) {
534 if (system_add_address(dev, a_new))
535 a_new->failed = true;
536
537 if (!keep) {
538 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
539 v6 = true;
540
541 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
542
543 if (table) {
544 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
545 (v6) ? 128 : 32, table, NULL, NULL);
546 set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
547 a_new->mask, table, NULL, NULL);
548 }
549 }
550
551 if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
552 interface_handle_subnet_route(iface, a_new, true);
553 }
554 }
555 }
556
557 static bool
558 enable_route(struct interface_ip_settings *ip, struct device_route *route)
559 {
560 if (ip->no_defaultroute && !route->mask)
561 return false;
562
563 return ip->enabled;
564 }
565
566 static void
567 interface_update_proto_route(struct vlist_tree *tree,
568 struct vlist_node *node_new,
569 struct vlist_node *node_old)
570 {
571 struct interface_ip_settings *ip;
572 struct interface *iface;
573 struct device *dev;
574 struct device_route *route_old, *route_new;
575 bool keep = false;
576
577 ip = container_of(tree, struct interface_ip_settings, route);
578 iface = ip->iface;
579 dev = iface->l3_dev.dev;
580
581 if (!node_new || !node_old)
582 iface->updated |= IUF_ROUTE;
583
584 route_old = container_of(node_old, struct device_route, node);
585 route_new = container_of(node_new, struct device_route, node);
586
587 if (node_old && node_new)
588 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
589 (route_old->mtu == route_new->mtu) && !route_old->failed;
590
591 if (node_old) {
592 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
593 system_del_route(dev, route_old);
594
595 free(route_old);
596 }
597
598 if (node_new) {
599 bool _enabled = enable_route(ip, route_new);
600
601 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
602 if (system_add_route(dev, route_new))
603 route_new->failed = true;
604
605 route_new->iface = iface;
606 route_new->enabled = _enabled;
607 }
608 }
609
610 static void
611 interface_update_host_route(struct vlist_tree *tree,
612 struct vlist_node *node_new,
613 struct vlist_node *node_old)
614 {
615 struct interface *iface;
616 struct device *dev;
617 struct device_route *route_old, *route_new;
618
619 iface = container_of(tree, struct interface, host_routes);
620 dev = iface->l3_dev.dev;
621
622 route_old = container_of(node_old, struct device_route, node);
623 route_new = container_of(node_new, struct device_route, node);
624
625 if (node_old) {
626 system_del_route(dev, route_old);
627 free(route_old);
628 }
629
630 if (node_new) {
631 if (system_add_route(dev, route_new))
632 route_new->failed = true;
633 }
634 }
635
636
637 static void
638 interface_set_prefix_address(struct device_prefix_assignment *assignment,
639 const struct device_prefix *prefix, struct interface *iface, bool add)
640 {
641 const struct interface *uplink = prefix->iface;
642 if (!iface->l3_dev.dev)
643 return;
644
645 struct device *l3_downlink = iface->l3_dev.dev;
646
647 struct device_addr addr;
648 memset(&addr, 0, sizeof(addr));
649 addr.addr.in6 = prefix->addr;
650 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
651 addr.addr.in6.s6_addr[15] += 1;
652 addr.mask = assignment->length;
653 addr.flags = DEVADDR_INET6;
654 addr.preferred_until = prefix->preferred_until;
655 addr.valid_until = prefix->valid_until;
656
657 if (!add && assignment->enabled) {
658 time_t now = system_get_rtime();
659 addr.preferred_until = now;
660 if (!addr.valid_until || addr.valid_until - now > 7200)
661 addr.valid_until = now + 7200;
662 system_del_address(l3_downlink, &addr); // Work around dangling prefix routes
663 system_add_address(l3_downlink, &addr);
664 if (prefix->iface) {
665 if (prefix->iface->ip6table)
666 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
667 addr.mask, prefix->iface->ip6table, iface, NULL);
668
669 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
670 addr.mask, 0, iface, "unreachable");
671 }
672
673 assignment->enabled = false;
674 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
675 !system_add_address(l3_downlink, &addr)) {
676 if (prefix->iface && !assignment->enabled) {
677 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
678 addr.mask, 0, iface, "unreachable");
679
680 if (prefix->iface->ip6table)
681 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
682 addr.mask, prefix->iface->ip6table, iface, NULL);
683 }
684 if (uplink && uplink->l3_dev.dev) {
685 int mtu = system_update_ipv6_mtu(
686 uplink->l3_dev.dev, 0);
687 if (mtu > 0)
688 system_update_ipv6_mtu(l3_downlink, mtu);
689 }
690 assignment->enabled = true;
691 }
692 }
693
694 static bool interface_prefix_assign(struct list_head *list,
695 struct device_prefix_assignment *assign)
696 {
697 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
698 struct device_prefix_assignment *c;
699 list_for_each_entry(c, list, head) {
700 if (assign->assigned != -1) {
701 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
702 list_add_tail(&assign->head, &c->head);
703 return true;
704 }
705 } else if (assign->assigned == -1) {
706 current = (current + asize) & (~asize);
707 if (current + asize < c->assigned) {
708 assign->assigned = current;
709 list_add_tail(&assign->head, &c->head);
710 return true;
711 }
712 }
713 current = (c->assigned + (1 << (64 - c->length)));
714 }
715 return false;
716 }
717
718 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
719 {
720 struct device_prefix_assignment *c;
721 struct interface *iface;
722
723 // Delete all assignments
724 while (!list_empty(&prefix->assignments)) {
725 c = list_first_entry(&prefix->assignments,
726 struct device_prefix_assignment, head);
727 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
728 interface_set_prefix_address(c, prefix, iface, false);
729 list_del(&c->head);
730 free(c);
731 }
732
733 if (!setup)
734 return;
735
736 // End-of-assignment sentinel
737 c = malloc(sizeof(*c) + 1);
738 c->assigned = 1 << (64 - prefix->length);
739 c->length = 64;
740 c->name[0] = 0;
741 list_add(&c->head, &prefix->assignments);
742
743 // Excluded prefix
744 if (prefix->excl_length > 0) {
745 const char name[] = "!excluded";
746 c = malloc(sizeof(*c) + sizeof(name));
747 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
748 ((1 << (64 - prefix->length)) - 1);
749 c->length = prefix->excl_length;
750 memcpy(c->name, name, sizeof(name));
751 list_add(&c->head, &prefix->assignments);
752 }
753
754 bool assigned_any = false;
755 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
756 vlist_for_each_element(&interfaces, iface, node) {
757 if (iface->assignment_length < 48 ||
758 iface->assignment_length > 64)
759 continue;
760
761 // Test whether there is a matching class
762 if (!list_empty(&iface->assignment_classes)) {
763 bool found = false;
764
765 struct interface_assignment_class *c;
766 list_for_each_entry(c, &iface->assignment_classes, head) {
767 if (!strcmp(c->name, prefix->pclass)) {
768 found = true;
769 break;
770 }
771 }
772
773 if (!found)
774 continue;
775 }
776
777 size_t namelen = strlen(iface->name) + 1;
778 c = malloc(sizeof(*c) + namelen);
779 c->length = iface->assignment_length;
780 c->assigned = iface->assignment_hint;
781 c->enabled = false;
782 memcpy(c->name, iface->name, namelen);
783
784 // First process all custom assignments, put all others in later-list
785 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
786 if (c->assigned != -1) {
787 c->assigned = -1;
788 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
789 "of size %hhu for %s, trying other\n", c->length, c->name);
790 }
791
792 struct list_head *next = &assign_later;
793 struct device_prefix_assignment *n;
794 list_for_each_entry(n, &assign_later, head) {
795 if (n->length < c->length) {
796 next = &n->head;
797 break;
798 }
799 }
800 list_add_tail(&c->head, next);
801 }
802
803 if (c->assigned != -1)
804 assigned_any = true;
805 }
806
807 // Then try to assign all other + failed custom assignments
808 while (!list_empty(&assign_later)) {
809 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
810 list_del(&c->head);
811
812 bool assigned = false;
813 do {
814 assigned = interface_prefix_assign(&prefix->assignments, c);
815 } while (!assigned && ++c->length <= 64);
816
817 if (!assigned) {
818 netifd_log_message(L_WARNING, "Failed to assign subprefix "
819 "of size %hhu for %s\n", c->length, c->name);
820 free(c);
821 } else {
822 assigned_any = true;
823 }
824 }
825
826 list_for_each_entry(c, &prefix->assignments, head)
827 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
828 interface_set_prefix_address(c, prefix, iface, true);
829
830 if (!assigned_any)
831 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
832 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
833 }
834
835
836 void interface_refresh_assignments(bool hint)
837 {
838 static bool refresh = false;
839 if (!hint && refresh) {
840 struct device_prefix *p;
841 list_for_each_entry(p, &prefixes, head)
842 interface_update_prefix_assignments(p, true);
843 }
844 refresh = hint;
845 }
846
847
848 static void
849 interface_update_prefix(struct vlist_tree *tree,
850 struct vlist_node *node_new,
851 struct vlist_node *node_old)
852 {
853 struct device_prefix *prefix_old, *prefix_new;
854 prefix_old = container_of(node_old, struct device_prefix, node);
855 prefix_new = container_of(node_new, struct device_prefix, node);
856
857 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
858 if (tree && (!node_new || !node_old))
859 ip->iface->updated |= IUF_PREFIX;
860
861 struct device_route route;
862 memset(&route, 0, sizeof(route));
863 route.flags = DEVADDR_INET6;
864 route.metric = INT32_MAX;
865 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
866 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
867
868
869 struct device_prefix_assignment *c;
870 struct interface *iface;
871
872 if (node_old && node_new) {
873 // Move assignments and refresh addresses to update valid times
874 list_splice(&prefix_old->assignments, &prefix_new->assignments);
875
876 list_for_each_entry(c, &prefix_new->assignments, head)
877 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
878 interface_set_prefix_address(c, prefix_new, iface, true);
879 } else if (node_new) {
880 // Set null-route to avoid routing loops
881 system_add_route(NULL, &route);
882
883 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
884 interface_update_prefix_assignments(prefix_new, true);
885 } else if (node_old) {
886 // Remove null-route
887 interface_update_prefix_assignments(prefix_old, false);
888 system_del_route(NULL, &route);
889 }
890
891 if (node_old) {
892 if (prefix_old->head.next)
893 list_del(&prefix_old->head);
894 free(prefix_old);
895 }
896
897 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
898 list_add(&prefix_new->head, &prefixes);
899
900 }
901
902 struct device_prefix*
903 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
904 uint8_t length, time_t valid_until, time_t preferred_until,
905 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
906 {
907 if (!pclass)
908 pclass = (iface) ? iface->name : "local";
909
910 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
911 prefix->length = length;
912 prefix->addr = *addr;
913 prefix->preferred_until = preferred_until;
914 prefix->valid_until = valid_until;
915 prefix->iface = iface;
916 INIT_LIST_HEAD(&prefix->assignments);
917
918 if (excl_addr) {
919 prefix->excl_addr = *excl_addr;
920 prefix->excl_length = excl_length;
921 }
922
923 strcpy(prefix->pclass, pclass);
924
925 if (iface)
926 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
927 else
928 interface_update_prefix(NULL, &prefix->node, NULL);
929
930 return prefix;
931 }
932
933 void
934 interface_ip_set_ula_prefix(const char *prefix)
935 {
936 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
937 if (prefix)
938 strncpy(buf, prefix, sizeof(buf) - 1);
939 char *prefixaddr = strtok_r(buf, "/", &saveptr);
940
941 struct in6_addr addr;
942 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
943 if (ula_prefix) {
944 interface_update_prefix(NULL, NULL, &ula_prefix->node);
945 ula_prefix = NULL;
946 }
947 return;
948 }
949
950 int length;
951 char *prefixlen = strtok_r(NULL, ",", &saveptr);
952 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
953 return;
954
955 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
956 ula_prefix->length != length) {
957 if (ula_prefix)
958 interface_update_prefix(NULL, NULL, &ula_prefix->node);
959
960 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
961 0, 0, NULL, 0, NULL);
962 }
963 }
964
965 void
966 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
967 {
968 struct dns_server *s;
969
970 s = calloc(1, sizeof(*s));
971 if (!s)
972 return;
973
974 s->af = AF_INET;
975 if (inet_pton(s->af, str, &s->addr.in))
976 goto add;
977
978 s->af = AF_INET6;
979 if (inet_pton(s->af, str, &s->addr.in))
980 goto add;
981
982 free(s);
983 return;
984
985 add:
986 D(INTERFACE, "Add IPv%c DNS server: %s\n",
987 s->af == AF_INET6 ? '6' : '4', str);
988 vlist_simple_add(&ip->dns_servers, &s->node);
989 }
990
991 void
992 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
993 {
994 struct blob_attr *cur;
995 int rem;
996
997 blobmsg_for_each_attr(cur, list, rem) {
998 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
999 continue;
1000
1001 if (!blobmsg_check_attr(cur, NULL))
1002 continue;
1003
1004 interface_add_dns_server(ip, blobmsg_data(cur));
1005 }
1006 }
1007
1008 static void
1009 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1010 {
1011 struct dns_search_domain *s;
1012 int len = strlen(str);
1013
1014 s = calloc(1, sizeof(*s) + len + 1);
1015 if (!s)
1016 return;
1017
1018 D(INTERFACE, "Add DNS search domain: %s\n", str);
1019 memcpy(s->name, str, len);
1020 vlist_simple_add(&ip->dns_search, &s->node);
1021 }
1022
1023 void
1024 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1025 {
1026 struct blob_attr *cur;
1027 int rem;
1028
1029 blobmsg_for_each_attr(cur, list, rem) {
1030 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1031 continue;
1032
1033 if (!blobmsg_check_attr(cur, NULL))
1034 continue;
1035
1036 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1037 }
1038 }
1039
1040 static void
1041 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1042 {
1043 struct dns_server *s;
1044 struct dns_search_domain *d;
1045 const char *str;
1046 char buf[INET6_ADDRSTRLEN];
1047
1048 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1049 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1050 if (!str)
1051 continue;
1052
1053 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1054 fprintf(f, "nameserver %s%%%s\n", str, dev);
1055 else
1056 fprintf(f, "nameserver %s\n", str);
1057 }
1058
1059 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1060 fprintf(f, "search %s\n", d->name);
1061 }
1062 }
1063
1064 void
1065 interface_write_resolv_conf(void)
1066 {
1067 struct interface *iface;
1068 char *path = alloca(strlen(resolv_conf) + 5);
1069 FILE *f;
1070 uint32_t crcold, crcnew;
1071
1072 sprintf(path, "%s.tmp", resolv_conf);
1073 unlink(path);
1074 f = fopen(path, "w+");
1075 if (!f) {
1076 D(INTERFACE, "Failed to open %s for writing\n", path);
1077 return;
1078 }
1079
1080 vlist_for_each_element(&interfaces, iface, node) {
1081 if (iface->state != IFS_UP)
1082 continue;
1083
1084 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1085 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1086 vlist_simple_empty(&iface->config_ip.dns_search) &&
1087 vlist_simple_empty(&iface->config_ip.dns_servers))
1088 continue;
1089
1090 fprintf(f, "# Interface %s\n", iface->name);
1091 write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
1092 if (!iface->proto_ip.no_dns)
1093 write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
1094 }
1095 fflush(f);
1096 rewind(f);
1097 crcnew = crc32_file(f);
1098 fclose(f);
1099
1100 crcold = crcnew + 1;
1101 f = fopen(resolv_conf, "r");
1102 if (f) {
1103 crcold = crc32_file(f);
1104 fclose(f);
1105 }
1106
1107 if (crcold == crcnew) {
1108 unlink(path);
1109 } else if (rename(path, resolv_conf) < 0) {
1110 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1111 unlink(path);
1112 }
1113 }
1114
1115 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1116 {
1117 struct device_addr *addr;
1118 struct device_route *route;
1119 struct device *dev;
1120
1121 ip->enabled = enabled;
1122 dev = ip->iface->l3_dev.dev;
1123 if (!dev)
1124 return;
1125
1126 vlist_for_each_element(&ip->addr, addr, node) {
1127 if (addr->enabled == enabled)
1128 continue;
1129
1130 if (enabled)
1131 system_add_address(dev, addr);
1132 else
1133 system_del_address(dev, addr);
1134 addr->enabled = enabled;
1135 }
1136
1137 vlist_for_each_element(&ip->route, route, node) {
1138 bool _enabled = enabled;
1139
1140 if (!enable_route(ip, route))
1141 _enabled = false;
1142
1143 if (route->enabled == _enabled)
1144 continue;
1145
1146 if (_enabled) {
1147 if (!(route->flags & DEVROUTE_METRIC))
1148 route->metric = ip->iface->metric;
1149
1150 if (system_add_route(dev, route))
1151 route->failed = true;
1152 } else
1153 system_del_route(dev, route);
1154 route->enabled = _enabled;
1155 }
1156
1157 struct device_prefix *c;
1158 struct device_prefix_assignment *a;
1159 list_for_each_entry(c, &prefixes, head)
1160 list_for_each_entry(a, &c->assignments, head)
1161 if (!strcmp(a->name, ip->iface->name))
1162 interface_set_prefix_address(a, c, ip->iface, enabled);
1163
1164 if (ip->iface && ip->iface->l3_dev.dev) {
1165 set_ip_lo_policy(enabled, true, ip->iface);
1166 set_ip_lo_policy(enabled, false, ip->iface);
1167
1168 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1169 NULL, 0, 0, ip->iface, "failed_policy");
1170 }
1171 }
1172
1173 void
1174 interface_ip_update_start(struct interface_ip_settings *ip)
1175 {
1176 if (ip != &ip->iface->config_ip) {
1177 vlist_simple_update(&ip->dns_servers);
1178 vlist_simple_update(&ip->dns_search);
1179 }
1180 vlist_update(&ip->route);
1181 vlist_update(&ip->addr);
1182 vlist_update(&ip->prefix);
1183 }
1184
1185 void
1186 interface_ip_update_complete(struct interface_ip_settings *ip)
1187 {
1188 vlist_simple_flush(&ip->dns_servers);
1189 vlist_simple_flush(&ip->dns_search);
1190 vlist_flush(&ip->route);
1191 vlist_flush(&ip->addr);
1192 vlist_flush(&ip->prefix);
1193 interface_write_resolv_conf();
1194 }
1195
1196 void
1197 interface_ip_flush(struct interface_ip_settings *ip)
1198 {
1199 if (ip == &ip->iface->proto_ip)
1200 vlist_flush_all(&ip->iface->host_routes);
1201 vlist_simple_flush_all(&ip->dns_servers);
1202 vlist_simple_flush_all(&ip->dns_search);
1203 vlist_flush_all(&ip->route);
1204 vlist_flush_all(&ip->addr);
1205 vlist_flush_all(&ip->prefix);
1206 }
1207
1208 static void
1209 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1210 {
1211 ip->iface = iface;
1212 ip->enabled = true;
1213 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1214 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1215 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1216 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1217 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1218 }
1219
1220 void
1221 interface_ip_init(struct interface *iface)
1222 {
1223 __interface_ip_init(&iface->proto_ip, iface);
1224 __interface_ip_init(&iface->config_ip, iface);
1225 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1226
1227 }
1228
1229 static void
1230 interface_ip_valid_until_handler(struct uloop_timeout *t)
1231 {
1232 time_t now = system_get_rtime();
1233 struct interface *iface;
1234 vlist_for_each_element(&interfaces, iface, node) {
1235 if (iface->state != IFS_UP)
1236 continue;
1237
1238 struct device_addr *addr, *addrp;
1239 struct device_route *route, *routep;
1240 struct device_prefix *pref, *prefp;
1241
1242 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1243 if (addr->valid_until && addr->valid_until < now)
1244 vlist_delete(&iface->proto_ip.addr, &addr->node);
1245
1246 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1247 if (route->valid_until && route->valid_until < now)
1248 vlist_delete(&iface->proto_ip.route, &route->node);
1249
1250 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1251 if (pref->valid_until && pref->valid_until < now)
1252 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1253
1254 }
1255
1256 uloop_timeout_set(t, 1000);
1257 }
1258
1259 static void __init
1260 interface_ip_init_worker(void)
1261 {
1262 valid_until_timeout.cb = interface_ip_valid_until_handler;
1263 uloop_timeout_set(&valid_until_timeout, 1000);
1264 }
OpenWrt Network interface configuration daemon