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interface-ip: Don't create ip network rule if address mask is equal to full mask
[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 bool
137 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
138 {
139 struct device_addr *addr;
140
141 vlist_for_each_element(&ip->addr, addr, node) {
142 if (!addr->enabled)
143 continue;
144
145 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
146 continue;
147
148 // Handle offlink addresses correctly
149 unsigned int mask = addr->mask;
150 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
151 (addr->flags & DEVADDR_OFFLINK))
152 mask = 128;
153
154 if (!match_if_addr(&addr->addr, a, mask))
155 continue;
156
157 return true;
158 }
159
160 return false;
161 }
162
163 static void
164 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
165 bool v6, struct device_route **res)
166 {
167 struct device_route *route;
168
169 vlist_for_each_element(&ip->route, route, node) {
170 if (!route->enabled)
171 continue;
172
173 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
174 continue;
175
176 if (!match_if_addr(&route->addr, a, route->mask))
177 continue;
178
179 if (route->flags & DEVROUTE_TABLE)
180 continue;
181
182 if (!*res || route->mask < (*res)->mask)
183 *res = route;
184 }
185 }
186
187 static bool
188 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
189 {
190 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
191 __find_ip_addr_target(&iface->config_ip, a, v6);
192 }
193
194 static void
195 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
196 bool v6, struct device_route **route)
197 {
198 __find_ip_route_target(&iface->proto_ip, a, v6, route);
199 __find_ip_route_target(&iface->config_ip, a, v6, route);
200 }
201
202 struct interface *
203 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
204 {
205 struct device_route *route, *r_next = NULL;
206 bool defaultroute_target = false;
207 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
208
209 route = calloc(1, sizeof(*route));
210 if (!route)
211 return NULL;
212
213 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
214 route->mask = v6 ? 128 : 32;
215 if (memcmp(&route->addr, addr, addrsize) == 0)
216 defaultroute_target = true;
217 else
218 memcpy(&route->addr, addr, addrsize);
219
220 if (iface) {
221 /* look for locally addressable target first */
222 if (interface_ip_find_addr_target(iface, addr, v6))
223 goto done;
224
225 /* do not stop at the first route, let the lookup compare
226 * masks to find the best match */
227 interface_ip_find_route_target(iface, addr, v6, &r_next);
228 } else {
229 vlist_for_each_element(&interfaces, iface, node) {
230 /* look for locally addressable target first */
231 if (interface_ip_find_addr_target(iface, addr, v6))
232 goto done;
233
234 /* do not stop at the first route, let the lookup compare
235 * masks to find the best match */
236 interface_ip_find_route_target(iface, addr, v6, &r_next);
237 }
238 }
239
240 if (!r_next) {
241 free(route);
242 return NULL;
243 }
244
245 iface = r_next->iface;
246 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
247 route->mtu = r_next->mtu;
248 route->metric = r_next->metric;
249 route->table = r_next->table;
250
251 done:
252 route->iface = iface;
253 if (defaultroute_target)
254 free(route);
255 else
256 vlist_add(&iface->host_routes, &route->node, route);
257 return iface;
258 }
259
260 void
261 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
262 {
263 struct interface_ip_settings *ip;
264 struct blob_attr *tb[__ROUTE_MAX], *cur;
265 struct device_route *route;
266 int af = v6 ? AF_INET6 : AF_INET;
267 bool is_proto_route = !!iface;
268
269 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
270
271 if (!iface) {
272 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
273 return;
274
275 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
276 if (!iface)
277 return;
278
279 ip = &iface->config_ip;
280 } else {
281 ip = &iface->proto_ip;
282 }
283
284 route = calloc(1, sizeof(*route));
285 if (!route)
286 return;
287
288 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
289 route->mask = v6 ? 128 : 32;
290 if ((cur = tb[ROUTE_MASK]) != NULL) {
291 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
292 if (route->mask > (v6 ? 128 : 32))
293 goto error;
294 }
295
296 if ((cur = tb[ROUTE_TARGET]) != NULL) {
297 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
298 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
299 goto error;
300 }
301 }
302
303 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
304 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
305 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
306 goto error;
307 }
308 }
309
310 if ((cur = tb[ROUTE_METRIC]) != NULL) {
311 route->metric = blobmsg_get_u32(cur);
312 route->flags |= DEVROUTE_METRIC;
313 } else
314 route->metric = iface->metric;
315
316 if ((cur = tb[ROUTE_MTU]) != NULL) {
317 route->mtu = blobmsg_get_u32(cur);
318 route->flags |= DEVROUTE_MTU;
319 }
320
321 // Use source-based routing
322 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
323 char *saveptr, *source = alloca(blobmsg_data_len(cur));
324 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
325
326 const char *addr = strtok_r(source, "/", &saveptr);
327 const char *mask = strtok_r(NULL, "/", &saveptr);
328
329 if (!addr || inet_pton(af, addr, &route->source) < 1) {
330 DPRINTF("Failed to parse route source: %s\n", addr);
331 goto error;
332 }
333
334 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
335 }
336
337 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
338 route->flags |= DEVROUTE_ONLINK;
339
340 if (is_proto_route) {
341 route->table = (v6) ? iface->ip6table : iface->ip4table;
342 route->flags |= DEVROUTE_SRCTABLE;
343 }
344
345 if ((cur = tb[ROUTE_TABLE]) != NULL) {
346 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
347 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
348 goto error;
349 }
350
351 /* only set the table flag if not using the main (default) table */
352 if (system_is_default_rt_table(route->table))
353 route->table = 0;
354
355 if (route->table)
356 route->flags |= DEVROUTE_TABLE;
357 }
358
359 if ((cur = tb[ROUTE_VALID]) != NULL) {
360 int64_t valid = blobmsg_get_u32(cur);
361 int64_t valid_until = valid + (int64_t)system_get_rtime();
362 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
363 route->valid_until = valid_until;
364 }
365
366 if ((cur = tb[ROUTE_TYPE]) != NULL) {
367 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
368 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
369 goto error;
370 }
371 route->flags |= DEVROUTE_TYPE;
372 }
373
374 vlist_add(&ip->route, &route->node, route);
375 return;
376
377 error:
378 free(route);
379 }
380
381 static int
382 addr_cmp(const void *k1, const void *k2, void *ptr)
383 {
384 return memcmp(k1, k2, sizeof(struct device_addr) -
385 offsetof(struct device_addr, flags));
386 }
387
388 static int
389 route_cmp(const void *k1, const void *k2, void *ptr)
390 {
391 const struct device_route *r1 = k1, *r2 = k2;
392
393 if (r1->mask != r2->mask)
394 return r2->mask - r1->mask;
395
396 if (r1->metric != r2->metric)
397 return r1->metric - r2->metric;
398
399 if (r1->flags != r2->flags)
400 return r2->flags - r1->flags;
401
402 if (r1->sourcemask != r2->sourcemask)
403 return r1->sourcemask - r2->sourcemask;
404
405 if (r1->table != r2->table)
406 return r1->table - r2->table;
407
408 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
409 if (maskcmp)
410 return maskcmp;
411
412 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
413 }
414
415 static int
416 prefix_cmp(const void *k1, const void *k2, void *ptr)
417 {
418 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
419 offsetof(struct device_prefix, addr));
420 }
421
422 static void
423 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
424 {
425 struct device *dev = iface->l3_dev.dev;
426 struct device_route route;
427
428 if (addr->flags & DEVADDR_OFFLINK)
429 return;
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 route.flags &= ~DEVADDR_KERNEL;
443 route.metric = iface->metric;
444 system_add_route(dev, &route);
445 } else {
446 system_del_route(dev, &route);
447 }
448 }
449
450 static void
451 interface_update_proto_addr(struct vlist_tree *tree,
452 struct vlist_node *node_new,
453 struct vlist_node *node_old)
454 {
455 struct interface_ip_settings *ip;
456 struct interface *iface;
457 struct device *dev;
458 struct device_addr *a_new = NULL, *a_old = NULL;
459 bool replace = false;
460 bool keep = false;
461 bool v6 = false;
462
463 ip = container_of(tree, struct interface_ip_settings, addr);
464 iface = ip->iface;
465 dev = iface->l3_dev.dev;
466
467 if (!node_new || !node_old)
468 iface->updated |= IUF_ADDRESS;
469
470 if (node_new) {
471 a_new = container_of(node_new, struct device_addr, node);
472
473 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
474 !a_new->broadcast) {
475
476 uint32_t mask = ~0;
477 uint32_t *a = (uint32_t *) &a_new->addr;
478
479 mask >>= a_new->mask;
480 a_new->broadcast = *a | htonl(mask);
481 }
482 }
483
484 if (node_old)
485 a_old = container_of(node_old, struct device_addr, node);
486
487 if (a_new && a_old) {
488 keep = true;
489
490 if (a_old->flags != a_new->flags || a_old->failed)
491 keep = false;
492
493 if (a_old->valid_until != a_new->valid_until ||
494 a_old->preferred_until != a_new->preferred_until)
495 replace = true;
496
497 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
498 a_new->broadcast != a_old->broadcast)
499 keep = false;
500 }
501
502 if (node_old) {
503 if (a_old->enabled && !keep) {
504 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
505 v6 = true;
506
507 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
508
509 //This is needed for source routing to work correctly. If a device
510 //has two connections to a network using the same subnet, adding
511 //only the network-rule will cause packets to be routed through the
512 //first matching network (source IP matches both masks).
513 if (table) {
514 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
515 (v6) ? 128 : 32, table, NULL, NULL);
516
517 if (a_old->mask != ((v6) ? 128 : 32))
518 set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
519 a_old->mask, table, NULL, NULL);
520 }
521
522 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
523 interface_handle_subnet_route(iface, a_old, false);
524 system_del_address(dev, a_old);
525 }
526 }
527 free(a_old->pclass);
528 free(a_old);
529 }
530
531 if (node_new) {
532 a_new->enabled = true;
533 if (!keep || replace) {
534 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
535 if (system_add_address(dev, a_new))
536 a_new->failed = true;
537
538 if (iface->metric)
539 interface_handle_subnet_route(iface, a_new, true);
540 }
541
542 if (!keep) {
543 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
544 v6 = true;
545
546 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
547
548 if (table) {
549 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
550 (v6) ? 128 : 32, table, NULL, NULL);
551
552 if (a_new->mask != ((v6) ? 128 : 32))
553 set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
554 a_new->mask, table, NULL, NULL);
555 }
556 }
557 }
558 }
559 }
560
561 static bool
562 enable_route(struct interface_ip_settings *ip, struct device_route *route)
563 {
564 if (ip->no_defaultroute && !route->mask)
565 return false;
566
567 return ip->enabled;
568 }
569
570 static void
571 interface_update_proto_route(struct vlist_tree *tree,
572 struct vlist_node *node_new,
573 struct vlist_node *node_old)
574 {
575 struct interface_ip_settings *ip;
576 struct interface *iface;
577 struct device *dev;
578 struct device_route *route_old, *route_new;
579 bool keep = false;
580
581 ip = container_of(tree, struct interface_ip_settings, route);
582 iface = ip->iface;
583 dev = iface->l3_dev.dev;
584
585 if (!node_new || !node_old)
586 iface->updated |= IUF_ROUTE;
587
588 route_old = container_of(node_old, struct device_route, node);
589 route_new = container_of(node_new, struct device_route, node);
590
591 if (node_old && node_new)
592 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
593 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
594 (route_old->valid_until == route_new->valid_until) && !route_old->failed;
595
596 if (node_old) {
597 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
598 system_del_route(dev, route_old);
599
600 free(route_old);
601 }
602
603 if (node_new) {
604 bool _enabled = enable_route(ip, route_new);
605
606 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
607 if (system_add_route(dev, route_new))
608 route_new->failed = true;
609
610 route_new->iface = iface;
611 route_new->enabled = _enabled;
612 }
613 }
614
615 static void
616 interface_update_host_route(struct vlist_tree *tree,
617 struct vlist_node *node_new,
618 struct vlist_node *node_old)
619 {
620 struct interface *iface;
621 struct device *dev;
622 struct device_route *route_old, *route_new;
623
624 iface = container_of(tree, struct interface, host_routes);
625 dev = iface->l3_dev.dev;
626
627 route_old = container_of(node_old, struct device_route, node);
628 route_new = container_of(node_new, struct device_route, node);
629
630 if (node_old) {
631 system_del_route(dev, route_old);
632 free(route_old);
633 }
634
635 if (node_new) {
636 if (system_add_route(dev, route_new))
637 route_new->failed = true;
638 }
639 }
640
641 static void
642 random_ifaceid(struct in6_addr *addr)
643 {
644 static bool initialized = false;
645 struct timeval t;
646
647 if (!initialized) {
648 long int seed = 0;
649 gettimeofday(&t, NULL);
650 seed = t.tv_sec ^ t.tv_usec ^ getpid();
651 srand48(seed);
652 initialized = true;
653 }
654 addr->s6_addr32[2] = (uint32_t)mrand48();
655 addr->s6_addr32[3] = (uint32_t)mrand48();
656 }
657
658 static void
659 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
660 {
661 /* get mac address */
662 uint8_t *macaddr = iface->l3_dev.dev->settings.macaddr;
663 uint8_t *ifaceid = addr->s6_addr + 8;
664 memcpy(ifaceid,macaddr,3);
665 memcpy(ifaceid + 5,macaddr + 3, 3);
666 ifaceid[3] = 0xff;
667 ifaceid[4] = 0xfe;
668 ifaceid[0] ^= 0x02;
669 }
670
671 static void
672 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
673 {
674 /* generate new iface id */
675 switch (iface->assignment_iface_id_selection) {
676 case IFID_FIXED:
677 /* fixed */
678 /* copy host part from assignment_fixed_iface_id */
679 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
680 break;
681 case IFID_RANDOM:
682 /* randomize last 64 bits */
683 random_ifaceid(addr);
684 break;
685 case IFID_EUI64:
686 /* eui64 */
687 eui64_ifaceid(iface, addr);
688 break;
689 }
690 }
691
692 static void
693 interface_set_prefix_address(struct device_prefix_assignment *assignment,
694 const struct device_prefix *prefix, struct interface *iface, bool add)
695 {
696 const struct interface *uplink = prefix->iface;
697 if (!iface->l3_dev.dev)
698 return;
699
700 struct device *l3_downlink = iface->l3_dev.dev;
701
702 struct device_addr addr;
703 struct device_route route;
704 memset(&addr, 0, sizeof(addr));
705 memset(&route, 0, sizeof(route));
706
707 if (IN6_IS_ADDR_UNSPECIFIED(&assignment->addr)) {
708 addr.addr.in6 = prefix->addr;
709 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
710 generate_ifaceid(iface, &addr.addr.in6);
711 assignment->addr = addr.addr.in6;
712 }
713 else
714 addr.addr.in6 = assignment->addr;
715
716 addr.mask = assignment->length;
717 addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
718 addr.preferred_until = prefix->preferred_until;
719 addr.valid_until = prefix->valid_until;
720
721 route.flags = DEVADDR_INET6;
722 route.mask = addr.mask < 64 ? 64 : addr.mask;
723 route.addr = addr.addr;
724 clear_if_addr(&route.addr, route.mask);
725
726 if (!add && assignment->enabled) {
727 time_t now = system_get_rtime();
728 addr.preferred_until = now;
729 if (!addr.valid_until || addr.valid_until - now > 7200)
730 addr.valid_until = now + 7200;
731
732 if (prefix->iface) {
733 if (prefix->iface->ip6table)
734 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
735 addr.mask, prefix->iface->ip6table, iface, NULL);
736
737 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
738 addr.mask, 0, iface, "unreachable");
739 }
740
741 system_del_route(l3_downlink, &route);
742 system_add_address(l3_downlink, &addr);
743
744 assignment->enabled = false;
745 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
746 !system_add_address(l3_downlink, &addr)) {
747
748 if (prefix->iface && !assignment->enabled) {
749 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
750 addr.mask, 0, iface, "unreachable");
751
752 if (prefix->iface->ip6table)
753 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
754 addr.mask, prefix->iface->ip6table, iface, NULL);
755 }
756
757 route.metric = iface->metric;
758 system_add_route(l3_downlink, &route);
759
760 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
761 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
762 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
763
764 if (mtu > 0 && mtu_old > mtu)
765 system_update_ipv6_mtu(l3_downlink, mtu);
766 }
767
768 assignment->enabled = true;
769 }
770 }
771
772 static bool interface_prefix_assign(struct list_head *list,
773 struct device_prefix_assignment *assign)
774 {
775 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
776 struct device_prefix_assignment *c;
777 list_for_each_entry(c, list, head) {
778 if (assign->assigned != -1) {
779 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
780 list_add_tail(&assign->head, &c->head);
781 return true;
782 }
783 } else if (assign->assigned == -1) {
784 current = (current + asize) & (~asize);
785 if (current + asize < c->assigned) {
786 assign->assigned = current;
787 list_add_tail(&assign->head, &c->head);
788 return true;
789 }
790 }
791 current = (c->assigned + (1 << (64 - c->length)));
792 }
793 return false;
794 }
795
796 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
797 {
798 struct device_prefix_assignment *c;
799 struct interface *iface;
800
801 // Delete all assignments
802 while (!list_empty(&prefix->assignments)) {
803 c = list_first_entry(&prefix->assignments,
804 struct device_prefix_assignment, head);
805 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
806 interface_set_prefix_address(c, prefix, iface, false);
807 list_del(&c->head);
808 free(c);
809 }
810
811 if (!setup)
812 return;
813
814 // End-of-assignment sentinel
815 c = malloc(sizeof(*c) + 1);
816 c->assigned = 1 << (64 - prefix->length);
817 c->length = 64;
818 c->name[0] = 0;
819 c->addr = in6addr_any;
820 list_add(&c->head, &prefix->assignments);
821
822 // Excluded prefix
823 if (prefix->excl_length > 0) {
824 const char name[] = "!excluded";
825 c = malloc(sizeof(*c) + sizeof(name));
826 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
827 ((1 << (64 - prefix->length)) - 1);
828 c->length = prefix->excl_length;
829 c->addr = in6addr_any;
830 memcpy(c->name, name, sizeof(name));
831 list_add(&c->head, &prefix->assignments);
832 }
833
834 bool assigned_any = false;
835 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
836 vlist_for_each_element(&interfaces, iface, node) {
837 if (iface->assignment_length < 48 ||
838 iface->assignment_length > 64)
839 continue;
840
841 // Test whether there is a matching class
842 if (!list_empty(&iface->assignment_classes)) {
843 bool found = false;
844
845 struct interface_assignment_class *c;
846 list_for_each_entry(c, &iface->assignment_classes, head) {
847 if (!strcmp(c->name, prefix->pclass)) {
848 found = true;
849 break;
850 }
851 }
852
853 if (!found)
854 continue;
855 }
856
857 size_t namelen = strlen(iface->name) + 1;
858 c = malloc(sizeof(*c) + namelen);
859 c->length = iface->assignment_length;
860 c->assigned = iface->assignment_hint;
861 c->addr = in6addr_any;
862 c->enabled = false;
863 memcpy(c->name, iface->name, namelen);
864
865 // First process all custom assignments, put all others in later-list
866 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
867 if (c->assigned != -1) {
868 c->assigned = -1;
869 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
870 "of size %hhu for %s, trying other\n", c->length, c->name);
871 }
872
873 struct list_head *next = &assign_later;
874 struct device_prefix_assignment *n;
875 list_for_each_entry(n, &assign_later, head) {
876 if (n->length < c->length) {
877 next = &n->head;
878 break;
879 }
880 }
881 list_add_tail(&c->head, next);
882 }
883
884 if (c->assigned != -1)
885 assigned_any = true;
886 }
887
888 // Then try to assign all other + failed custom assignments
889 while (!list_empty(&assign_later)) {
890 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
891 list_del(&c->head);
892
893 bool assigned = false;
894 do {
895 assigned = interface_prefix_assign(&prefix->assignments, c);
896 } while (!assigned && ++c->length <= 64);
897
898 if (!assigned) {
899 netifd_log_message(L_WARNING, "Failed to assign subprefix "
900 "of size %hhu for %s\n", c->length, c->name);
901 free(c);
902 } else {
903 assigned_any = true;
904 }
905 }
906
907 list_for_each_entry(c, &prefix->assignments, head)
908 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
909 interface_set_prefix_address(c, prefix, iface, true);
910
911 if (!assigned_any)
912 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
913 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
914 }
915
916
917 void interface_refresh_assignments(bool hint)
918 {
919 static bool refresh = false;
920 if (!hint && refresh) {
921 struct device_prefix *p;
922 list_for_each_entry(p, &prefixes, head)
923 interface_update_prefix_assignments(p, true);
924 }
925 refresh = hint;
926 }
927
928
929 static void
930 interface_update_prefix(struct vlist_tree *tree,
931 struct vlist_node *node_new,
932 struct vlist_node *node_old)
933 {
934 struct device_prefix *prefix_old, *prefix_new;
935 prefix_old = container_of(node_old, struct device_prefix, node);
936 prefix_new = container_of(node_new, struct device_prefix, node);
937
938 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
939 if (tree && (!node_new || !node_old))
940 ip->iface->updated |= IUF_PREFIX;
941
942 struct device_route route;
943 memset(&route, 0, sizeof(route));
944 route.flags = DEVADDR_INET6;
945 route.metric = INT32_MAX;
946 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
947 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
948
949
950 struct device_prefix_assignment *c;
951 struct interface *iface;
952
953 if (node_old && node_new) {
954 // Move assignments and refresh addresses to update valid times
955 list_splice(&prefix_old->assignments, &prefix_new->assignments);
956
957 list_for_each_entry(c, &prefix_new->assignments, head)
958 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
959 interface_set_prefix_address(c, prefix_new, iface, true);
960 } else if (node_new) {
961 // Set null-route to avoid routing loops
962 system_add_route(NULL, &route);
963
964 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
965 interface_update_prefix_assignments(prefix_new, true);
966 } else if (node_old) {
967 // Remove null-route
968 interface_update_prefix_assignments(prefix_old, false);
969 system_del_route(NULL, &route);
970 }
971
972 if (node_old) {
973 if (prefix_old->head.next)
974 list_del(&prefix_old->head);
975 free(prefix_old);
976 }
977
978 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
979 list_add(&prefix_new->head, &prefixes);
980
981 }
982
983 struct device_prefix*
984 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
985 uint8_t length, time_t valid_until, time_t preferred_until,
986 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
987 {
988 if (!pclass)
989 pclass = (iface) ? iface->name : "local";
990
991 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
992 prefix->length = length;
993 prefix->addr = *addr;
994 prefix->preferred_until = preferred_until;
995 prefix->valid_until = valid_until;
996 prefix->iface = iface;
997 INIT_LIST_HEAD(&prefix->assignments);
998
999 if (excl_addr) {
1000 prefix->excl_addr = *excl_addr;
1001 prefix->excl_length = excl_length;
1002 }
1003
1004 strcpy(prefix->pclass, pclass);
1005
1006 if (iface)
1007 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1008 else
1009 interface_update_prefix(NULL, &prefix->node, NULL);
1010
1011 return prefix;
1012 }
1013
1014 void
1015 interface_ip_set_ula_prefix(const char *prefix)
1016 {
1017 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1018 if (prefix)
1019 strncpy(buf, prefix, sizeof(buf) - 1);
1020 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1021
1022 struct in6_addr addr;
1023 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1024 if (ula_prefix) {
1025 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1026 ula_prefix = NULL;
1027 }
1028 return;
1029 }
1030
1031 int length;
1032 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1033 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1034 return;
1035
1036 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1037 ula_prefix->length != length) {
1038 if (ula_prefix)
1039 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1040
1041 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1042 0, 0, NULL, 0, NULL);
1043 }
1044 }
1045
1046 void
1047 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1048 {
1049 struct dns_server *s;
1050
1051 s = calloc(1, sizeof(*s));
1052 if (!s)
1053 return;
1054
1055 s->af = AF_INET;
1056 if (inet_pton(s->af, str, &s->addr.in))
1057 goto add;
1058
1059 s->af = AF_INET6;
1060 if (inet_pton(s->af, str, &s->addr.in))
1061 goto add;
1062
1063 free(s);
1064 return;
1065
1066 add:
1067 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1068 s->af == AF_INET6 ? '6' : '4', str);
1069 vlist_simple_add(&ip->dns_servers, &s->node);
1070 }
1071
1072 void
1073 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1074 {
1075 struct blob_attr *cur;
1076 int rem;
1077
1078 blobmsg_for_each_attr(cur, list, rem) {
1079 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1080 continue;
1081
1082 if (!blobmsg_check_attr(cur, NULL))
1083 continue;
1084
1085 interface_add_dns_server(ip, blobmsg_data(cur));
1086 }
1087 }
1088
1089 static void
1090 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1091 {
1092 struct dns_search_domain *s;
1093 int len = strlen(str);
1094
1095 s = calloc(1, sizeof(*s) + len + 1);
1096 if (!s)
1097 return;
1098
1099 D(INTERFACE, "Add DNS search domain: %s\n", str);
1100 memcpy(s->name, str, len);
1101 vlist_simple_add(&ip->dns_search, &s->node);
1102 }
1103
1104 void
1105 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1106 {
1107 struct blob_attr *cur;
1108 int rem;
1109
1110 blobmsg_for_each_attr(cur, list, rem) {
1111 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1112 continue;
1113
1114 if (!blobmsg_check_attr(cur, NULL))
1115 continue;
1116
1117 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1118 }
1119 }
1120
1121 static void
1122 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1123 {
1124 struct dns_server *s;
1125 struct dns_search_domain *d;
1126 const char *str;
1127 char buf[INET6_ADDRSTRLEN];
1128
1129 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1130 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1131 if (!str)
1132 continue;
1133
1134 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1135 fprintf(f, "nameserver %s%%%s\n", str, dev);
1136 else
1137 fprintf(f, "nameserver %s\n", str);
1138 }
1139
1140 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1141 fprintf(f, "search %s\n", d->name);
1142 }
1143 }
1144
1145 void
1146 interface_write_resolv_conf(void)
1147 {
1148 struct interface *iface;
1149 char *path = alloca(strlen(resolv_conf) + 5);
1150 FILE *f;
1151 uint32_t crcold, crcnew;
1152
1153 sprintf(path, "%s.tmp", resolv_conf);
1154 unlink(path);
1155 f = fopen(path, "w+");
1156 if (!f) {
1157 D(INTERFACE, "Failed to open %s for writing\n", path);
1158 return;
1159 }
1160
1161 vlist_for_each_element(&interfaces, iface, node) {
1162 if (iface->state != IFS_UP)
1163 continue;
1164
1165 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1166 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1167 vlist_simple_empty(&iface->config_ip.dns_search) &&
1168 vlist_simple_empty(&iface->config_ip.dns_servers))
1169 continue;
1170
1171 fprintf(f, "# Interface %s\n", iface->name);
1172 write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
1173 if (!iface->proto_ip.no_dns)
1174 write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
1175 }
1176 fflush(f);
1177 rewind(f);
1178 crcnew = crc32_file(f);
1179 fclose(f);
1180
1181 crcold = crcnew + 1;
1182 f = fopen(resolv_conf, "r");
1183 if (f) {
1184 crcold = crc32_file(f);
1185 fclose(f);
1186 }
1187
1188 if (crcold == crcnew) {
1189 unlink(path);
1190 } else if (rename(path, resolv_conf) < 0) {
1191 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1192 unlink(path);
1193 }
1194 }
1195
1196 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1197 {
1198 struct device_addr *addr;
1199 struct device_route *route;
1200 struct device *dev;
1201 struct interface *iface;
1202
1203 ip->enabled = enabled;
1204 iface = ip->iface;
1205 dev = iface->l3_dev.dev;
1206 if (!dev)
1207 return;
1208
1209 vlist_for_each_element(&ip->addr, addr, node) {
1210 if (addr->enabled == enabled)
1211 continue;
1212
1213 if (enabled) {
1214 system_add_address(dev, addr);
1215 if (iface->metric)
1216 interface_handle_subnet_route(iface, addr, true);
1217 } else {
1218 interface_handle_subnet_route(iface, addr, false);
1219 system_del_address(dev, addr);
1220 }
1221 addr->enabled = enabled;
1222 }
1223
1224 vlist_for_each_element(&ip->route, route, node) {
1225 bool _enabled = enabled;
1226
1227 if (!enable_route(ip, route))
1228 _enabled = false;
1229
1230 if (route->enabled == _enabled)
1231 continue;
1232
1233 if (_enabled) {
1234 if (!(route->flags & DEVROUTE_METRIC))
1235 route->metric = ip->iface->metric;
1236
1237 if (system_add_route(dev, route))
1238 route->failed = true;
1239 } else
1240 system_del_route(dev, route);
1241 route->enabled = _enabled;
1242 }
1243
1244 struct device_prefix *c;
1245 struct device_prefix_assignment *a;
1246 list_for_each_entry(c, &prefixes, head)
1247 list_for_each_entry(a, &c->assignments, head)
1248 if (!strcmp(a->name, ip->iface->name))
1249 interface_set_prefix_address(a, c, ip->iface, enabled);
1250
1251 if (ip->iface && ip->iface->l3_dev.dev)
1252 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1253 NULL, 0, 0, ip->iface, "failed_policy");
1254 }
1255
1256 void
1257 interface_ip_update_start(struct interface_ip_settings *ip)
1258 {
1259 if (ip != &ip->iface->config_ip) {
1260 vlist_simple_update(&ip->dns_servers);
1261 vlist_simple_update(&ip->dns_search);
1262 }
1263 vlist_update(&ip->route);
1264 vlist_update(&ip->addr);
1265 vlist_update(&ip->prefix);
1266 }
1267
1268 void
1269 interface_ip_update_complete(struct interface_ip_settings *ip)
1270 {
1271 vlist_simple_flush(&ip->dns_servers);
1272 vlist_simple_flush(&ip->dns_search);
1273 vlist_flush(&ip->route);
1274 vlist_flush(&ip->addr);
1275 vlist_flush(&ip->prefix);
1276 interface_write_resolv_conf();
1277 }
1278
1279 void
1280 interface_ip_flush(struct interface_ip_settings *ip)
1281 {
1282 if (ip == &ip->iface->proto_ip)
1283 vlist_flush_all(&ip->iface->host_routes);
1284 vlist_simple_flush_all(&ip->dns_servers);
1285 vlist_simple_flush_all(&ip->dns_search);
1286 vlist_flush_all(&ip->route);
1287 vlist_flush_all(&ip->addr);
1288 vlist_flush_all(&ip->prefix);
1289 }
1290
1291 static void
1292 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1293 {
1294 ip->iface = iface;
1295 ip->enabled = true;
1296 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1297 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1298 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1299 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1300 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1301 }
1302
1303 void
1304 interface_ip_init(struct interface *iface)
1305 {
1306 __interface_ip_init(&iface->proto_ip, iface);
1307 __interface_ip_init(&iface->config_ip, iface);
1308 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1309 }
1310
1311 static void
1312 interface_ip_valid_until_handler(struct uloop_timeout *t)
1313 {
1314 time_t now = system_get_rtime();
1315 struct interface *iface;
1316 vlist_for_each_element(&interfaces, iface, node) {
1317 if (iface->state != IFS_UP)
1318 continue;
1319
1320 struct device_addr *addr, *addrp;
1321 struct device_route *route, *routep;
1322 struct device_prefix *pref, *prefp;
1323
1324 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1325 if (addr->valid_until && addr->valid_until < now)
1326 vlist_delete(&iface->proto_ip.addr, &addr->node);
1327
1328 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1329 if (route->valid_until && route->valid_until < now)
1330 vlist_delete(&iface->proto_ip.route, &route->node);
1331
1332 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1333 if (pref->valid_until && pref->valid_until < now)
1334 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1335
1336 }
1337
1338 uloop_timeout_set(t, 1000);
1339 }
1340
1341 static void __init
1342 interface_ip_init_worker(void)
1343 {
1344 valid_until_timeout.cb = interface_ip_valid_until_handler;
1345 uloop_timeout_set(&valid_until_timeout, 1000);
1346 }
OpenWrt Network interface configuration daemon