device: Don't process link events anymore in device user specific callback handlers
[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 /* only set the table flag if not using the main (default) table */
369 if (system_is_default_rt_table(route->table))
370 route->table = 0;
371
372 if (route->table)
373 route->flags |= DEVROUTE_TABLE;
374 }
375
376 if ((cur = tb[ROUTE_VALID]) != NULL) {
377 int64_t valid = blobmsg_get_u32(cur);
378 int64_t valid_until = valid + (int64_t)system_get_rtime();
379 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
380 route->valid_until = valid_until;
381 }
382
383 if ((cur = tb[ROUTE_TYPE]) != NULL) {
384 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
385 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
386 goto error;
387 }
388 route->flags |= DEVROUTE_TYPE;
389 }
390
391 vlist_add(&ip->route, &route->node, route);
392 return;
393
394 error:
395 free(route);
396 }
397
398 static int
399 addr_cmp(const void *k1, const void *k2, void *ptr)
400 {
401 return memcmp(k1, k2, sizeof(struct device_addr) -
402 offsetof(struct device_addr, flags));
403 }
404
405 static int
406 route_cmp(const void *k1, const void *k2, void *ptr)
407 {
408 const struct device_route *r1 = k1, *r2 = k2;
409
410 if (r1->mask != r2->mask)
411 return r2->mask - r1->mask;
412
413 if (r1->metric != r2->metric)
414 return r1->metric - r2->metric;
415
416 if (r1->flags != r2->flags)
417 return r2->flags - r1->flags;
418
419 if (r1->sourcemask != r2->sourcemask)
420 return r1->sourcemask - r2->sourcemask;
421
422 if (r1->table != r2->table)
423 return r1->table - r2->table;
424
425 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
426 if (maskcmp)
427 return maskcmp;
428
429 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
430 }
431
432 static int
433 prefix_cmp(const void *k1, const void *k2, void *ptr)
434 {
435 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
436 offsetof(struct device_prefix, addr));
437 }
438
439 static void
440 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
441 {
442 struct device *dev = iface->l3_dev.dev;
443 struct device_route route;
444
445 if (addr->flags & DEVADDR_OFFLINK)
446 return;
447
448 memset(&route, 0, sizeof(route));
449 route.iface = iface;
450 route.flags = addr->flags;
451 route.mask = addr->mask;
452 memcpy(&route.addr, &addr->addr, sizeof(route.addr));
453 clear_if_addr(&route.addr, route.mask);
454
455 if (add) {
456 route.flags |= DEVADDR_KERNEL;
457 system_del_route(dev, &route);
458
459 route.flags &= ~DEVADDR_KERNEL;
460 route.metric = iface->metric;
461 system_add_route(dev, &route);
462 } else {
463 system_del_route(dev, &route);
464 }
465 }
466
467 static void
468 interface_update_proto_addr(struct vlist_tree *tree,
469 struct vlist_node *node_new,
470 struct vlist_node *node_old)
471 {
472 struct interface_ip_settings *ip;
473 struct interface *iface;
474 struct device *dev;
475 struct device_addr *a_new = NULL, *a_old = NULL;
476 bool replace = false;
477 bool keep = false;
478 bool v6 = false;
479
480 ip = container_of(tree, struct interface_ip_settings, addr);
481 iface = ip->iface;
482 dev = iface->l3_dev.dev;
483
484 if (!node_new || !node_old)
485 iface->updated |= IUF_ADDRESS;
486
487 if (node_new) {
488 a_new = container_of(node_new, struct device_addr, node);
489
490 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
491 !a_new->broadcast) {
492
493 /* /31 and /32 addressing need 255.255.255.255
494 * as broadcast address. */
495 if (a_new->mask >= 31) {
496 a_new->broadcast = (uint32_t) ~0;
497 } else {
498 uint32_t mask = ~0;
499 uint32_t *a = (uint32_t *) &a_new->addr;
500
501 mask >>= a_new->mask;
502 a_new->broadcast = *a | htonl(mask);
503 }
504 }
505 }
506
507 if (node_old)
508 a_old = container_of(node_old, struct device_addr, node);
509
510 if (a_new && a_old) {
511 keep = true;
512
513 if (a_old->flags != a_new->flags || a_old->failed)
514 keep = false;
515
516 if (a_old->valid_until != a_new->valid_until ||
517 a_old->preferred_until != a_new->preferred_until)
518 replace = true;
519
520 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
521 a_new->broadcast != a_old->broadcast)
522 keep = false;
523 }
524
525 if (node_old) {
526 if (a_old->enabled && !keep) {
527 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
528 v6 = true;
529
530 //This is needed for source routing to work correctly. If a device
531 //has two connections to a network using the same subnet, adding
532 //only the network-rule will cause packets to be routed through the
533 //first matching network (source IP matches both masks).
534 if (a_old->policy_table)
535 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
536 (v6) ? 128 : 32, a_old->policy_table, NULL, NULL);
537
538 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
539 interface_handle_subnet_route(iface, a_old, false);
540 system_del_address(dev, a_old);
541 }
542 }
543 free(a_old->pclass);
544 free(a_old);
545 }
546
547 if (node_new) {
548 a_new->enabled = true;
549
550 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
551 v6 = true;
552
553 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
554
555 if (!keep || replace) {
556 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
557 if (system_add_address(dev, a_new))
558 a_new->failed = true;
559
560 if (iface->metric)
561 interface_handle_subnet_route(iface, a_new, true);
562 }
563
564 if (!keep) {
565 if (a_new->policy_table)
566 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
567 (v6) ? 128 : 32, a_new->policy_table, NULL, NULL);
568 }
569 }
570 }
571 }
572
573 static bool
574 enable_route(struct interface_ip_settings *ip, struct device_route *route)
575 {
576 if (ip->no_defaultroute && !route->mask)
577 return false;
578
579 return ip->enabled;
580 }
581
582 static void
583 interface_update_proto_route(struct vlist_tree *tree,
584 struct vlist_node *node_new,
585 struct vlist_node *node_old)
586 {
587 struct interface_ip_settings *ip;
588 struct interface *iface;
589 struct device *dev;
590 struct device_route *route_old, *route_new;
591 bool keep = false;
592
593 ip = container_of(tree, struct interface_ip_settings, route);
594 iface = ip->iface;
595 dev = iface->l3_dev.dev;
596
597 if (!node_new || !node_old)
598 iface->updated |= IUF_ROUTE;
599
600 route_old = container_of(node_old, struct device_route, node);
601 route_new = container_of(node_new, struct device_route, node);
602
603 if (node_old && node_new)
604 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
605 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
606 !route_old->failed;
607
608 if (node_old) {
609 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
610 system_del_route(dev, route_old);
611
612 free(route_old);
613 }
614
615 if (node_new) {
616 bool _enabled = enable_route(ip, route_new);
617
618 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
619 if (system_add_route(dev, route_new))
620 route_new->failed = true;
621
622 route_new->iface = iface;
623 route_new->enabled = _enabled;
624 }
625 }
626
627 static void
628 interface_update_host_route(struct vlist_tree *tree,
629 struct vlist_node *node_new,
630 struct vlist_node *node_old)
631 {
632 struct interface *iface;
633 struct device *dev;
634 struct device_route *route_old, *route_new;
635
636 iface = container_of(tree, struct interface, host_routes);
637 dev = iface->l3_dev.dev;
638
639 route_old = container_of(node_old, struct device_route, node);
640 route_new = container_of(node_new, struct device_route, node);
641
642 if (node_old) {
643 system_del_route(dev, route_old);
644 free(route_old);
645 }
646
647 if (node_new) {
648 if (system_add_route(dev, route_new))
649 route_new->failed = true;
650 }
651 }
652
653 static void
654 random_ifaceid(struct in6_addr *addr)
655 {
656 static bool initialized = false;
657 struct timeval t;
658
659 if (!initialized) {
660 long int seed = 0;
661 gettimeofday(&t, NULL);
662 seed = t.tv_sec ^ t.tv_usec ^ getpid();
663 srand48(seed);
664 initialized = true;
665 }
666 addr->s6_addr32[2] = (uint32_t)mrand48();
667 addr->s6_addr32[3] = (uint32_t)mrand48();
668 }
669
670 static void
671 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
672 {
673 /* get mac address */
674 uint8_t *macaddr = iface->l3_dev.dev->settings.macaddr;
675 uint8_t *ifaceid = addr->s6_addr + 8;
676 memcpy(ifaceid,macaddr,3);
677 memcpy(ifaceid + 5,macaddr + 3, 3);
678 ifaceid[3] = 0xff;
679 ifaceid[4] = 0xfe;
680 ifaceid[0] ^= 0x02;
681 }
682
683 static void
684 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
685 {
686 /* generate new iface id */
687 switch (iface->assignment_iface_id_selection) {
688 case IFID_FIXED:
689 /* fixed */
690 /* copy host part from assignment_fixed_iface_id */
691 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
692 break;
693 case IFID_RANDOM:
694 /* randomize last 64 bits */
695 random_ifaceid(addr);
696 break;
697 case IFID_EUI64:
698 /* eui64 */
699 eui64_ifaceid(iface, addr);
700 break;
701 }
702 }
703
704 static void
705 interface_set_prefix_address(struct device_prefix_assignment *assignment,
706 const struct device_prefix *prefix, struct interface *iface, bool add)
707 {
708 const struct interface *uplink = prefix->iface;
709 if (!iface->l3_dev.dev)
710 return;
711
712 struct device *l3_downlink = iface->l3_dev.dev;
713
714 struct device_addr addr;
715 struct device_route route;
716 memset(&addr, 0, sizeof(addr));
717 memset(&route, 0, sizeof(route));
718
719 if (IN6_IS_ADDR_UNSPECIFIED(&assignment->addr)) {
720 addr.addr.in6 = prefix->addr;
721 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
722 generate_ifaceid(iface, &addr.addr.in6);
723 assignment->addr = addr.addr.in6;
724 }
725 else
726 addr.addr.in6 = assignment->addr;
727
728 addr.mask = assignment->length;
729 addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
730 addr.preferred_until = prefix->preferred_until;
731 addr.valid_until = prefix->valid_until;
732
733 route.flags = DEVADDR_INET6;
734 route.mask = addr.mask < 64 ? 64 : addr.mask;
735 route.addr = addr.addr;
736 clear_if_addr(&route.addr, route.mask);
737
738 if (!add && assignment->enabled) {
739 time_t now = system_get_rtime();
740 addr.preferred_until = now;
741 if (!addr.valid_until || addr.valid_until - now > 7200)
742 addr.valid_until = now + 7200;
743
744 if (prefix->iface) {
745 if (prefix->iface->ip6table)
746 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
747 addr.mask, prefix->iface->ip6table, iface, NULL);
748
749 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
750 addr.mask, 0, iface, "unreachable");
751 }
752
753 system_del_route(l3_downlink, &route);
754 system_add_address(l3_downlink, &addr);
755
756 assignment->enabled = false;
757 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
758 !system_add_address(l3_downlink, &addr)) {
759
760 if (prefix->iface && !assignment->enabled) {
761 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
762 addr.mask, 0, iface, "unreachable");
763
764 if (prefix->iface->ip6table)
765 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
766 addr.mask, prefix->iface->ip6table, iface, NULL);
767 }
768
769 route.metric = iface->metric;
770 system_add_route(l3_downlink, &route);
771
772 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
773 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
774 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
775
776 if (mtu > 0 && mtu_old > mtu)
777 system_update_ipv6_mtu(l3_downlink, mtu);
778 }
779
780 assignment->enabled = true;
781 }
782 }
783
784 static bool interface_prefix_assign(struct list_head *list,
785 struct device_prefix_assignment *assign)
786 {
787 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
788 struct device_prefix_assignment *c;
789 list_for_each_entry(c, list, head) {
790 if (assign->assigned != -1) {
791 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
792 list_add_tail(&assign->head, &c->head);
793 return true;
794 }
795 } else if (assign->assigned == -1) {
796 current = (current + asize) & (~asize);
797 if (current + asize < c->assigned) {
798 assign->assigned = current;
799 list_add_tail(&assign->head, &c->head);
800 return true;
801 }
802 }
803 current = (c->assigned + (1 << (64 - c->length)));
804 }
805 return false;
806 }
807
808 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
809 {
810 struct device_prefix_assignment *c;
811 struct interface *iface;
812
813 // Delete all assignments
814 while (!list_empty(&prefix->assignments)) {
815 c = list_first_entry(&prefix->assignments,
816 struct device_prefix_assignment, head);
817 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
818 interface_set_prefix_address(c, prefix, iface, false);
819 list_del(&c->head);
820 free(c);
821 }
822
823 if (!setup)
824 return;
825
826 // End-of-assignment sentinel
827 c = malloc(sizeof(*c) + 1);
828 c->assigned = 1 << (64 - prefix->length);
829 c->length = 64;
830 c->name[0] = 0;
831 c->addr = in6addr_any;
832 list_add(&c->head, &prefix->assignments);
833
834 // Excluded prefix
835 if (prefix->excl_length > 0) {
836 const char name[] = "!excluded";
837 c = malloc(sizeof(*c) + sizeof(name));
838 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
839 ((1 << (64 - prefix->length)) - 1);
840 c->length = prefix->excl_length;
841 c->addr = in6addr_any;
842 memcpy(c->name, name, sizeof(name));
843 list_add(&c->head, &prefix->assignments);
844 }
845
846 bool assigned_any = false;
847 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
848 vlist_for_each_element(&interfaces, iface, node) {
849 if (iface->assignment_length < 48 ||
850 iface->assignment_length > 64)
851 continue;
852
853 // Test whether there is a matching class
854 if (!list_empty(&iface->assignment_classes)) {
855 bool found = false;
856
857 struct interface_assignment_class *c;
858 list_for_each_entry(c, &iface->assignment_classes, head) {
859 if (!strcmp(c->name, prefix->pclass)) {
860 found = true;
861 break;
862 }
863 }
864
865 if (!found)
866 continue;
867 }
868
869 size_t namelen = strlen(iface->name) + 1;
870 c = malloc(sizeof(*c) + namelen);
871 c->length = iface->assignment_length;
872 c->assigned = iface->assignment_hint;
873 c->addr = in6addr_any;
874 c->enabled = false;
875 memcpy(c->name, iface->name, namelen);
876
877 // First process all custom assignments, put all others in later-list
878 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
879 if (c->assigned != -1) {
880 c->assigned = -1;
881 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
882 "of size %hhu for %s, trying other\n", c->length, c->name);
883 }
884
885 struct list_head *next = &assign_later;
886 struct device_prefix_assignment *n;
887 list_for_each_entry(n, &assign_later, head) {
888 if (n->length < c->length) {
889 next = &n->head;
890 break;
891 }
892 }
893 list_add_tail(&c->head, next);
894 }
895
896 if (c->assigned != -1)
897 assigned_any = true;
898 }
899
900 // Then try to assign all other + failed custom assignments
901 while (!list_empty(&assign_later)) {
902 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
903 list_del(&c->head);
904
905 bool assigned = false;
906 do {
907 assigned = interface_prefix_assign(&prefix->assignments, c);
908 } while (!assigned && ++c->length <= 64);
909
910 if (!assigned) {
911 netifd_log_message(L_WARNING, "Failed to assign subprefix "
912 "of size %hhu for %s\n", c->length, c->name);
913 free(c);
914 } else {
915 assigned_any = true;
916 }
917 }
918
919 list_for_each_entry(c, &prefix->assignments, head)
920 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
921 interface_set_prefix_address(c, prefix, iface, true);
922
923 if (!assigned_any)
924 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
925 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
926 }
927
928
929 void interface_refresh_assignments(bool hint)
930 {
931 static bool refresh = false;
932 if (!hint && refresh) {
933 struct device_prefix *p;
934 list_for_each_entry(p, &prefixes, head)
935 interface_update_prefix_assignments(p, true);
936 }
937 refresh = hint;
938 }
939
940
941 static void
942 interface_update_prefix(struct vlist_tree *tree,
943 struct vlist_node *node_new,
944 struct vlist_node *node_old)
945 {
946 struct device_prefix *prefix_old, *prefix_new;
947 prefix_old = container_of(node_old, struct device_prefix, node);
948 prefix_new = container_of(node_new, struct device_prefix, node);
949
950 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
951 if (tree && (!node_new || !node_old))
952 ip->iface->updated |= IUF_PREFIX;
953
954 struct device_route route;
955 memset(&route, 0, sizeof(route));
956 route.flags = DEVADDR_INET6;
957 route.metric = INT32_MAX;
958 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
959 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
960
961
962 struct device_prefix_assignment *c;
963 struct interface *iface;
964
965 if (node_old && node_new) {
966 // Move assignments and refresh addresses to update valid times
967 list_splice(&prefix_old->assignments, &prefix_new->assignments);
968
969 list_for_each_entry(c, &prefix_new->assignments, head)
970 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
971 interface_set_prefix_address(c, prefix_new, iface, true);
972 } else if (node_new) {
973 // Set null-route to avoid routing loops
974 system_add_route(NULL, &route);
975
976 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
977 interface_update_prefix_assignments(prefix_new, true);
978 } else if (node_old) {
979 // Remove null-route
980 interface_update_prefix_assignments(prefix_old, false);
981 system_del_route(NULL, &route);
982 }
983
984 if (node_old) {
985 if (prefix_old->head.next)
986 list_del(&prefix_old->head);
987 free(prefix_old);
988 }
989
990 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
991 list_add(&prefix_new->head, &prefixes);
992
993 }
994
995 struct device_prefix*
996 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
997 uint8_t length, time_t valid_until, time_t preferred_until,
998 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
999 {
1000 if (!pclass)
1001 pclass = (iface) ? iface->name : "local";
1002
1003 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1004 prefix->length = length;
1005 prefix->addr = *addr;
1006 prefix->preferred_until = preferred_until;
1007 prefix->valid_until = valid_until;
1008 prefix->iface = iface;
1009 INIT_LIST_HEAD(&prefix->assignments);
1010
1011 if (excl_addr) {
1012 prefix->excl_addr = *excl_addr;
1013 prefix->excl_length = excl_length;
1014 }
1015
1016 strcpy(prefix->pclass, pclass);
1017
1018 if (iface)
1019 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1020 else
1021 interface_update_prefix(NULL, &prefix->node, NULL);
1022
1023 return prefix;
1024 }
1025
1026 void
1027 interface_ip_set_ula_prefix(const char *prefix)
1028 {
1029 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1030 if (prefix)
1031 strncpy(buf, prefix, sizeof(buf) - 1);
1032 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1033
1034 struct in6_addr addr;
1035 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1036 if (ula_prefix) {
1037 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1038 ula_prefix = NULL;
1039 }
1040 return;
1041 }
1042
1043 int length;
1044 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1045 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1046 return;
1047
1048 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1049 ula_prefix->length != length) {
1050 if (ula_prefix)
1051 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1052
1053 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1054 0, 0, NULL, 0, NULL);
1055 }
1056 }
1057
1058 void
1059 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1060 {
1061 struct dns_server *s;
1062
1063 s = calloc(1, sizeof(*s));
1064 if (!s)
1065 return;
1066
1067 s->af = AF_INET;
1068 if (inet_pton(s->af, str, &s->addr.in))
1069 goto add;
1070
1071 s->af = AF_INET6;
1072 if (inet_pton(s->af, str, &s->addr.in))
1073 goto add;
1074
1075 free(s);
1076 return;
1077
1078 add:
1079 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1080 s->af == AF_INET6 ? '6' : '4', str);
1081 vlist_simple_add(&ip->dns_servers, &s->node);
1082 }
1083
1084 void
1085 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1086 {
1087 struct blob_attr *cur;
1088 int rem;
1089
1090 blobmsg_for_each_attr(cur, list, rem) {
1091 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1092 continue;
1093
1094 if (!blobmsg_check_attr(cur, NULL))
1095 continue;
1096
1097 interface_add_dns_server(ip, blobmsg_data(cur));
1098 }
1099 }
1100
1101 static void
1102 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1103 {
1104 struct dns_search_domain *s;
1105 int len = strlen(str);
1106
1107 s = calloc(1, sizeof(*s) + len + 1);
1108 if (!s)
1109 return;
1110
1111 D(INTERFACE, "Add DNS search domain: %s\n", str);
1112 memcpy(s->name, str, len);
1113 vlist_simple_add(&ip->dns_search, &s->node);
1114 }
1115
1116 void
1117 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1118 {
1119 struct blob_attr *cur;
1120 int rem;
1121
1122 blobmsg_for_each_attr(cur, list, rem) {
1123 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1124 continue;
1125
1126 if (!blobmsg_check_attr(cur, NULL))
1127 continue;
1128
1129 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1130 }
1131 }
1132
1133 static void
1134 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1135 {
1136 struct dns_server *s;
1137 struct dns_search_domain *d;
1138 const char *str;
1139 char buf[INET6_ADDRSTRLEN];
1140
1141 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1142 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1143 if (!str)
1144 continue;
1145
1146 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1147 fprintf(f, "nameserver %s%%%s\n", str, dev);
1148 else
1149 fprintf(f, "nameserver %s\n", str);
1150 }
1151
1152 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1153 fprintf(f, "search %s\n", d->name);
1154 }
1155 }
1156
1157 void
1158 interface_write_resolv_conf(void)
1159 {
1160 struct interface *iface;
1161 char *path = alloca(strlen(resolv_conf) + 5);
1162 FILE *f;
1163 uint32_t crcold, crcnew;
1164
1165 sprintf(path, "%s.tmp", resolv_conf);
1166 unlink(path);
1167 f = fopen(path, "w+");
1168 if (!f) {
1169 D(INTERFACE, "Failed to open %s for writing\n", path);
1170 return;
1171 }
1172
1173 vlist_for_each_element(&interfaces, iface, node) {
1174 if (iface->state != IFS_UP)
1175 continue;
1176
1177 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1178 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1179 vlist_simple_empty(&iface->config_ip.dns_search) &&
1180 vlist_simple_empty(&iface->config_ip.dns_servers))
1181 continue;
1182
1183 fprintf(f, "# Interface %s\n", iface->name);
1184 write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
1185 if (!iface->proto_ip.no_dns)
1186 write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
1187 }
1188 fflush(f);
1189 rewind(f);
1190 crcnew = crc32_file(f);
1191 fclose(f);
1192
1193 crcold = crcnew + 1;
1194 f = fopen(resolv_conf, "r");
1195 if (f) {
1196 crcold = crc32_file(f);
1197 fclose(f);
1198 }
1199
1200 if (crcold == crcnew) {
1201 unlink(path);
1202 } else if (rename(path, resolv_conf) < 0) {
1203 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1204 unlink(path);
1205 }
1206 }
1207
1208 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1209 {
1210 struct device_addr *addr;
1211 struct device_route *route;
1212 struct device *dev;
1213 struct interface *iface;
1214
1215 ip->enabled = enabled;
1216 iface = ip->iface;
1217 dev = iface->l3_dev.dev;
1218 if (!dev)
1219 return;
1220
1221 vlist_for_each_element(&ip->addr, addr, node) {
1222 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1223
1224 if (addr->enabled == enabled)
1225 continue;
1226
1227 if (enabled) {
1228 system_add_address(dev, addr);
1229 if (iface->metric)
1230 interface_handle_subnet_route(iface, addr, true);
1231
1232 addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1233 if (addr->policy_table)
1234 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
1235 (v6) ? 128 : 32, addr->policy_table, NULL, NULL);
1236 } else {
1237 interface_handle_subnet_route(iface, addr, false);
1238 system_del_address(dev, addr);
1239
1240 if (addr->policy_table)
1241 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
1242 (v6) ? 128 : 32, addr->policy_table, NULL, NULL);
1243 }
1244 addr->enabled = enabled;
1245 }
1246
1247 vlist_for_each_element(&ip->route, route, node) {
1248 bool _enabled = enabled;
1249
1250 if (!enable_route(ip, route))
1251 _enabled = false;
1252
1253 if (route->enabled == _enabled)
1254 continue;
1255
1256 if (_enabled) {
1257 if (!(route->flags & DEVROUTE_METRIC))
1258 route->metric = ip->iface->metric;
1259
1260 if (!(route->flags & DEVROUTE_TABLE)) {
1261 route->flags &= ~DEVROUTE_SRCTABLE;
1262 route->table = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ?
1263 iface->ip6table : iface->ip4table;
1264
1265 if (route->table)
1266 route->flags |= DEVROUTE_SRCTABLE;
1267 }
1268
1269 if (system_add_route(dev, route))
1270 route->failed = true;
1271 } else
1272 system_del_route(dev, route);
1273 route->enabled = _enabled;
1274 }
1275
1276 struct device_prefix *c;
1277 struct device_prefix_assignment *a;
1278 list_for_each_entry(c, &prefixes, head)
1279 list_for_each_entry(a, &c->assignments, head)
1280 if (!strcmp(a->name, ip->iface->name))
1281 interface_set_prefix_address(a, c, ip->iface, enabled);
1282
1283 if (ip->iface && ip->iface->l3_dev.dev) {
1284 set_ip_lo_policy(enabled, true, ip->iface);
1285 set_ip_lo_policy(enabled, false, ip->iface);
1286
1287 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1288 NULL, 0, 0, ip->iface, "failed_policy");
1289 }
1290 }
1291
1292 void
1293 interface_ip_update_start(struct interface_ip_settings *ip)
1294 {
1295 if (ip != &ip->iface->config_ip) {
1296 vlist_simple_update(&ip->dns_servers);
1297 vlist_simple_update(&ip->dns_search);
1298 }
1299 vlist_update(&ip->route);
1300 vlist_update(&ip->addr);
1301 vlist_update(&ip->prefix);
1302 }
1303
1304 void
1305 interface_ip_update_complete(struct interface_ip_settings *ip)
1306 {
1307 vlist_simple_flush(&ip->dns_servers);
1308 vlist_simple_flush(&ip->dns_search);
1309 vlist_flush(&ip->route);
1310 vlist_flush(&ip->addr);
1311 vlist_flush(&ip->prefix);
1312 interface_write_resolv_conf();
1313 }
1314
1315 void
1316 interface_ip_flush(struct interface_ip_settings *ip)
1317 {
1318 if (ip == &ip->iface->proto_ip)
1319 vlist_flush_all(&ip->iface->host_routes);
1320 vlist_simple_flush_all(&ip->dns_servers);
1321 vlist_simple_flush_all(&ip->dns_search);
1322 vlist_flush_all(&ip->route);
1323 vlist_flush_all(&ip->addr);
1324 vlist_flush_all(&ip->prefix);
1325 }
1326
1327 static void
1328 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1329 {
1330 ip->iface = iface;
1331 ip->enabled = true;
1332 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1333 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1334 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1335 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1336 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1337 }
1338
1339 void
1340 interface_ip_init(struct interface *iface)
1341 {
1342 __interface_ip_init(&iface->proto_ip, iface);
1343 __interface_ip_init(&iface->config_ip, iface);
1344 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1345 }
1346
1347 static void
1348 interface_ip_valid_until_handler(struct uloop_timeout *t)
1349 {
1350 time_t now = system_get_rtime();
1351 struct interface *iface;
1352 vlist_for_each_element(&interfaces, iface, node) {
1353 if (iface->state != IFS_UP)
1354 continue;
1355
1356 struct device_addr *addr, *addrp;
1357 struct device_route *route, *routep;
1358 struct device_prefix *pref, *prefp;
1359
1360 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1361 if (addr->valid_until && addr->valid_until < now)
1362 vlist_delete(&iface->proto_ip.addr, &addr->node);
1363
1364 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1365 if (route->valid_until && route->valid_until < now)
1366 vlist_delete(&iface->proto_ip.route, &route->node);
1367
1368 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1369 if (pref->valid_until && pref->valid_until < now)
1370 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1371
1372 }
1373
1374 uloop_timeout_set(t, 1000);
1375 }
1376
1377 static void __init
1378 interface_ip_init_worker(void)
1379 {
1380 valid_until_timeout.cb = interface_ip_valid_until_handler;
1381 uloop_timeout_set(&valid_until_timeout, 1000);
1382 }