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proto-shell: fix for not handling switch from DHCP to static race
[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 memset(&route, 0, sizeof(route));
446 route.iface = iface;
447 route.flags = addr->flags;
448 route.mask = addr->mask;
449 memcpy(&route.addr, &addr->addr, sizeof(route.addr));
450 clear_if_addr(&route.addr, route.mask);
451
452 if (add) {
453 route.flags |= DEVADDR_KERNEL;
454 system_del_route(dev, &route);
455
456 if (!(addr->flags & DEVADDR_OFFLINK)) {
457 route.flags &= ~DEVADDR_KERNEL;
458 route.metric = iface->metric;
459 system_add_route(dev, &route);
460 }
461 } else {
462 if (!(addr->flags & DEVADDR_OFFLINK))
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 uint32_t mask = ~0;
494 uint32_t *a = (uint32_t *) &a_new->addr;
495
496 mask >>= a_new->mask;
497 a_new->broadcast = *a | htonl(mask);
498 }
499 }
500
501 if (node_old)
502 a_old = container_of(node_old, struct device_addr, node);
503
504 if (a_new && a_old) {
505 keep = true;
506
507 if (a_old->flags != a_new->flags || a_old->failed)
508 keep = false;
509
510 if (a_old->valid_until != a_new->valid_until ||
511 a_old->preferred_until != a_new->preferred_until)
512 replace = true;
513
514 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
515 a_new->broadcast != a_old->broadcast)
516 keep = false;
517 }
518
519 if (node_old) {
520 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
521 interface_handle_subnet_route(iface, a_old, false);
522
523 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
524 v6 = true;
525
526 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
527
528 //This is needed for source routing to work correctly. If a device
529 //has two connections to a network using the same subnet, adding
530 //only the network-rule will cause packets to be routed through the
531 //first matching network (source IP matches both masks).
532 if (table) {
533 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
534 (v6) ? 128 : 32, table, NULL, NULL);
535 set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
536 a_old->mask, table, NULL, NULL);
537 }
538
539 system_del_address(dev, a_old);
540 }
541 free(a_old->pclass);
542 free(a_old);
543 }
544
545 if (node_new) {
546 a_new->enabled = true;
547 if (!(a_new->flags & DEVADDR_EXTERNAL) && (!keep || replace)) {
548 if (system_add_address(dev, a_new))
549 a_new->failed = true;
550
551 if (!keep) {
552 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
553 v6 = true;
554
555 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
556
557 if (table) {
558 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
559 (v6) ? 128 : 32, table, NULL, NULL);
560 set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
561 a_new->mask, table, NULL, NULL);
562 }
563 }
564
565 if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
566 interface_handle_subnet_route(iface, a_new, true);
567 }
568 }
569 }
570
571 static bool
572 enable_route(struct interface_ip_settings *ip, struct device_route *route)
573 {
574 if (ip->no_defaultroute && !route->mask)
575 return false;
576
577 return ip->enabled;
578 }
579
580 static void
581 interface_update_proto_route(struct vlist_tree *tree,
582 struct vlist_node *node_new,
583 struct vlist_node *node_old)
584 {
585 struct interface_ip_settings *ip;
586 struct interface *iface;
587 struct device *dev;
588 struct device_route *route_old, *route_new;
589 bool keep = false;
590
591 ip = container_of(tree, struct interface_ip_settings, route);
592 iface = ip->iface;
593 dev = iface->l3_dev.dev;
594
595 if (!node_new || !node_old)
596 iface->updated |= IUF_ROUTE;
597
598 route_old = container_of(node_old, struct device_route, node);
599 route_new = container_of(node_new, struct device_route, node);
600
601 if (node_old && node_new)
602 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
603 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
604 (route_old->valid_until == route_new->valid_until) && !route_old->failed;
605
606 if (node_old) {
607 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
608 system_del_route(dev, route_old);
609
610 free(route_old);
611 }
612
613 if (node_new) {
614 bool _enabled = enable_route(ip, route_new);
615
616 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
617 if (system_add_route(dev, route_new))
618 route_new->failed = true;
619
620 route_new->iface = iface;
621 route_new->enabled = _enabled;
622 }
623 }
624
625 static void
626 interface_update_host_route(struct vlist_tree *tree,
627 struct vlist_node *node_new,
628 struct vlist_node *node_old)
629 {
630 struct interface *iface;
631 struct device *dev;
632 struct device_route *route_old, *route_new;
633
634 iface = container_of(tree, struct interface, host_routes);
635 dev = iface->l3_dev.dev;
636
637 route_old = container_of(node_old, struct device_route, node);
638 route_new = container_of(node_new, struct device_route, node);
639
640 if (node_old) {
641 system_del_route(dev, route_old);
642 free(route_old);
643 }
644
645 if (node_new) {
646 if (system_add_route(dev, route_new))
647 route_new->failed = true;
648 }
649 }
650
651
652 static void
653 interface_set_prefix_address(struct device_prefix_assignment *assignment,
654 const struct device_prefix *prefix, struct interface *iface, bool add)
655 {
656 const struct interface *uplink = prefix->iface;
657 if (!iface->l3_dev.dev)
658 return;
659
660 struct device *l3_downlink = iface->l3_dev.dev;
661
662 struct device_addr addr;
663 memset(&addr, 0, sizeof(addr));
664 addr.addr.in6 = prefix->addr;
665 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
666 addr.addr.in6.s6_addr[15] += 1;
667 addr.mask = assignment->length;
668 addr.flags = DEVADDR_INET6;
669 addr.preferred_until = prefix->preferred_until;
670 addr.valid_until = prefix->valid_until;
671
672 if (addr.mask < 64) {
673 addr.mask = 64;
674 system_del_address(l3_downlink, &addr);
675 addr.mask = assignment->length;
676 }
677
678 if (!add && assignment->enabled) {
679 time_t now = system_get_rtime();
680 addr.preferred_until = now;
681 if (!addr.valid_until || addr.valid_until - now > 7200)
682 addr.valid_until = now + 7200;
683
684 system_del_address(l3_downlink, &addr); // Work around dangling prefix routes
685
686 if (prefix->iface) {
687 if (prefix->iface->ip6table)
688 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
689 addr.mask, prefix->iface->ip6table, iface, NULL);
690
691 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
692 addr.mask, 0, iface, "unreachable");
693 }
694
695 if (addr.mask < 64)
696 addr.mask = 64;
697
698 interface_handle_subnet_route(iface, &addr, false);
699 system_add_address(l3_downlink, &addr);
700
701 assignment->enabled = false;
702 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
703 !system_add_address(l3_downlink, &addr)) {
704 interface_handle_subnet_route(iface, &addr, false);
705
706 if (prefix->iface && !assignment->enabled) {
707 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
708 addr.mask, 0, iface, "unreachable");
709
710 if (prefix->iface->ip6table)
711 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
712 addr.mask, prefix->iface->ip6table, iface, NULL);
713 }
714
715 if (addr.mask < 64)
716 addr.mask = 64;
717
718 interface_handle_subnet_route(iface, &addr, true);
719
720 if (uplink && uplink->l3_dev.dev) {
721 int mtu = system_update_ipv6_mtu(
722 uplink->l3_dev.dev, 0);
723 if (mtu > 0)
724 system_update_ipv6_mtu(l3_downlink, mtu);
725 }
726
727 assignment->enabled = true;
728 }
729 }
730
731 static bool interface_prefix_assign(struct list_head *list,
732 struct device_prefix_assignment *assign)
733 {
734 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
735 struct device_prefix_assignment *c;
736 list_for_each_entry(c, list, head) {
737 if (assign->assigned != -1) {
738 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
739 list_add_tail(&assign->head, &c->head);
740 return true;
741 }
742 } else if (assign->assigned == -1) {
743 current = (current + asize) & (~asize);
744 if (current + asize < c->assigned) {
745 assign->assigned = current;
746 list_add_tail(&assign->head, &c->head);
747 return true;
748 }
749 }
750 current = (c->assigned + (1 << (64 - c->length)));
751 }
752 return false;
753 }
754
755 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
756 {
757 struct device_prefix_assignment *c;
758 struct interface *iface;
759
760 // Delete all assignments
761 while (!list_empty(&prefix->assignments)) {
762 c = list_first_entry(&prefix->assignments,
763 struct device_prefix_assignment, head);
764 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
765 interface_set_prefix_address(c, prefix, iface, false);
766 list_del(&c->head);
767 free(c);
768 }
769
770 if (!setup)
771 return;
772
773 // End-of-assignment sentinel
774 c = malloc(sizeof(*c) + 1);
775 c->assigned = 1 << (64 - prefix->length);
776 c->length = 64;
777 c->name[0] = 0;
778 list_add(&c->head, &prefix->assignments);
779
780 // Excluded prefix
781 if (prefix->excl_length > 0) {
782 const char name[] = "!excluded";
783 c = malloc(sizeof(*c) + sizeof(name));
784 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
785 ((1 << (64 - prefix->length)) - 1);
786 c->length = prefix->excl_length;
787 memcpy(c->name, name, sizeof(name));
788 list_add(&c->head, &prefix->assignments);
789 }
790
791 bool assigned_any = false;
792 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
793 vlist_for_each_element(&interfaces, iface, node) {
794 if (iface->assignment_length < 48 ||
795 iface->assignment_length > 64)
796 continue;
797
798 // Test whether there is a matching class
799 if (!list_empty(&iface->assignment_classes)) {
800 bool found = false;
801
802 struct interface_assignment_class *c;
803 list_for_each_entry(c, &iface->assignment_classes, head) {
804 if (!strcmp(c->name, prefix->pclass)) {
805 found = true;
806 break;
807 }
808 }
809
810 if (!found)
811 continue;
812 }
813
814 size_t namelen = strlen(iface->name) + 1;
815 c = malloc(sizeof(*c) + namelen);
816 c->length = iface->assignment_length;
817 c->assigned = iface->assignment_hint;
818 c->enabled = false;
819 memcpy(c->name, iface->name, namelen);
820
821 // First process all custom assignments, put all others in later-list
822 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
823 if (c->assigned != -1) {
824 c->assigned = -1;
825 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
826 "of size %hhu for %s, trying other\n", c->length, c->name);
827 }
828
829 struct list_head *next = &assign_later;
830 struct device_prefix_assignment *n;
831 list_for_each_entry(n, &assign_later, head) {
832 if (n->length < c->length) {
833 next = &n->head;
834 break;
835 }
836 }
837 list_add_tail(&c->head, next);
838 }
839
840 if (c->assigned != -1)
841 assigned_any = true;
842 }
843
844 // Then try to assign all other + failed custom assignments
845 while (!list_empty(&assign_later)) {
846 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
847 list_del(&c->head);
848
849 bool assigned = false;
850 do {
851 assigned = interface_prefix_assign(&prefix->assignments, c);
852 } while (!assigned && ++c->length <= 64);
853
854 if (!assigned) {
855 netifd_log_message(L_WARNING, "Failed to assign subprefix "
856 "of size %hhu for %s\n", c->length, c->name);
857 free(c);
858 } else {
859 assigned_any = true;
860 }
861 }
862
863 list_for_each_entry(c, &prefix->assignments, head)
864 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
865 interface_set_prefix_address(c, prefix, iface, true);
866
867 if (!assigned_any)
868 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
869 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
870 }
871
872
873 void interface_refresh_assignments(bool hint)
874 {
875 static bool refresh = false;
876 if (!hint && refresh) {
877 struct device_prefix *p;
878 list_for_each_entry(p, &prefixes, head)
879 interface_update_prefix_assignments(p, true);
880 }
881 refresh = hint;
882 }
883
884
885 static void
886 interface_update_prefix(struct vlist_tree *tree,
887 struct vlist_node *node_new,
888 struct vlist_node *node_old)
889 {
890 struct device_prefix *prefix_old, *prefix_new;
891 prefix_old = container_of(node_old, struct device_prefix, node);
892 prefix_new = container_of(node_new, struct device_prefix, node);
893
894 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
895 if (tree && (!node_new || !node_old))
896 ip->iface->updated |= IUF_PREFIX;
897
898 struct device_route route;
899 memset(&route, 0, sizeof(route));
900 route.flags = DEVADDR_INET6;
901 route.metric = INT32_MAX;
902 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
903 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
904
905
906 struct device_prefix_assignment *c;
907 struct interface *iface;
908
909 if (node_old && node_new) {
910 // Move assignments and refresh addresses to update valid times
911 list_splice(&prefix_old->assignments, &prefix_new->assignments);
912
913 list_for_each_entry(c, &prefix_new->assignments, head)
914 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
915 interface_set_prefix_address(c, prefix_new, iface, true);
916 } else if (node_new) {
917 // Set null-route to avoid routing loops
918 system_add_route(NULL, &route);
919
920 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
921 interface_update_prefix_assignments(prefix_new, true);
922 } else if (node_old) {
923 // Remove null-route
924 interface_update_prefix_assignments(prefix_old, false);
925 system_del_route(NULL, &route);
926 }
927
928 if (node_old) {
929 if (prefix_old->head.next)
930 list_del(&prefix_old->head);
931 free(prefix_old);
932 }
933
934 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
935 list_add(&prefix_new->head, &prefixes);
936
937 }
938
939 struct device_prefix*
940 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
941 uint8_t length, time_t valid_until, time_t preferred_until,
942 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
943 {
944 if (!pclass)
945 pclass = (iface) ? iface->name : "local";
946
947 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
948 prefix->length = length;
949 prefix->addr = *addr;
950 prefix->preferred_until = preferred_until;
951 prefix->valid_until = valid_until;
952 prefix->iface = iface;
953 INIT_LIST_HEAD(&prefix->assignments);
954
955 if (excl_addr) {
956 prefix->excl_addr = *excl_addr;
957 prefix->excl_length = excl_length;
958 }
959
960 strcpy(prefix->pclass, pclass);
961
962 if (iface)
963 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
964 else
965 interface_update_prefix(NULL, &prefix->node, NULL);
966
967 return prefix;
968 }
969
970 void
971 interface_ip_set_ula_prefix(const char *prefix)
972 {
973 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
974 if (prefix)
975 strncpy(buf, prefix, sizeof(buf) - 1);
976 char *prefixaddr = strtok_r(buf, "/", &saveptr);
977
978 struct in6_addr addr;
979 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
980 if (ula_prefix) {
981 interface_update_prefix(NULL, NULL, &ula_prefix->node);
982 ula_prefix = NULL;
983 }
984 return;
985 }
986
987 int length;
988 char *prefixlen = strtok_r(NULL, ",", &saveptr);
989 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
990 return;
991
992 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
993 ula_prefix->length != length) {
994 if (ula_prefix)
995 interface_update_prefix(NULL, NULL, &ula_prefix->node);
996
997 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
998 0, 0, NULL, 0, NULL);
999 }
1000 }
1001
1002 void
1003 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1004 {
1005 struct dns_server *s;
1006
1007 s = calloc(1, sizeof(*s));
1008 if (!s)
1009 return;
1010
1011 s->af = AF_INET;
1012 if (inet_pton(s->af, str, &s->addr.in))
1013 goto add;
1014
1015 s->af = AF_INET6;
1016 if (inet_pton(s->af, str, &s->addr.in))
1017 goto add;
1018
1019 free(s);
1020 return;
1021
1022 add:
1023 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1024 s->af == AF_INET6 ? '6' : '4', str);
1025 vlist_simple_add(&ip->dns_servers, &s->node);
1026 }
1027
1028 void
1029 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1030 {
1031 struct blob_attr *cur;
1032 int rem;
1033
1034 blobmsg_for_each_attr(cur, list, rem) {
1035 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1036 continue;
1037
1038 if (!blobmsg_check_attr(cur, NULL))
1039 continue;
1040
1041 interface_add_dns_server(ip, blobmsg_data(cur));
1042 }
1043 }
1044
1045 static void
1046 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1047 {
1048 struct dns_search_domain *s;
1049 int len = strlen(str);
1050
1051 s = calloc(1, sizeof(*s) + len + 1);
1052 if (!s)
1053 return;
1054
1055 D(INTERFACE, "Add DNS search domain: %s\n", str);
1056 memcpy(s->name, str, len);
1057 vlist_simple_add(&ip->dns_search, &s->node);
1058 }
1059
1060 void
1061 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1062 {
1063 struct blob_attr *cur;
1064 int rem;
1065
1066 blobmsg_for_each_attr(cur, list, rem) {
1067 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1068 continue;
1069
1070 if (!blobmsg_check_attr(cur, NULL))
1071 continue;
1072
1073 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1074 }
1075 }
1076
1077 static void
1078 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1079 {
1080 struct dns_server *s;
1081 struct dns_search_domain *d;
1082 const char *str;
1083 char buf[INET6_ADDRSTRLEN];
1084
1085 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1086 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1087 if (!str)
1088 continue;
1089
1090 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1091 fprintf(f, "nameserver %s%%%s\n", str, dev);
1092 else
1093 fprintf(f, "nameserver %s\n", str);
1094 }
1095
1096 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1097 fprintf(f, "search %s\n", d->name);
1098 }
1099 }
1100
1101 void
1102 interface_write_resolv_conf(void)
1103 {
1104 struct interface *iface;
1105 char *path = alloca(strlen(resolv_conf) + 5);
1106 FILE *f;
1107 uint32_t crcold, crcnew;
1108
1109 sprintf(path, "%s.tmp", resolv_conf);
1110 unlink(path);
1111 f = fopen(path, "w+");
1112 if (!f) {
1113 D(INTERFACE, "Failed to open %s for writing\n", path);
1114 return;
1115 }
1116
1117 vlist_for_each_element(&interfaces, iface, node) {
1118 if (iface->state != IFS_UP)
1119 continue;
1120
1121 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1122 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1123 vlist_simple_empty(&iface->config_ip.dns_search) &&
1124 vlist_simple_empty(&iface->config_ip.dns_servers))
1125 continue;
1126
1127 fprintf(f, "# Interface %s\n", iface->name);
1128 write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
1129 if (!iface->proto_ip.no_dns)
1130 write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
1131 }
1132 fflush(f);
1133 rewind(f);
1134 crcnew = crc32_file(f);
1135 fclose(f);
1136
1137 crcold = crcnew + 1;
1138 f = fopen(resolv_conf, "r");
1139 if (f) {
1140 crcold = crc32_file(f);
1141 fclose(f);
1142 }
1143
1144 if (crcold == crcnew) {
1145 unlink(path);
1146 } else if (rename(path, resolv_conf) < 0) {
1147 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1148 unlink(path);
1149 }
1150 }
1151
1152 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1153 {
1154 struct device_addr *addr;
1155 struct device_route *route;
1156 struct device *dev;
1157
1158 ip->enabled = enabled;
1159 dev = ip->iface->l3_dev.dev;
1160 if (!dev)
1161 return;
1162
1163 vlist_for_each_element(&ip->addr, addr, node) {
1164 if (addr->enabled == enabled)
1165 continue;
1166
1167 if (enabled)
1168 system_add_address(dev, addr);
1169 else
1170 system_del_address(dev, addr);
1171 addr->enabled = enabled;
1172 }
1173
1174 vlist_for_each_element(&ip->route, route, node) {
1175 bool _enabled = enabled;
1176
1177 if (!enable_route(ip, route))
1178 _enabled = false;
1179
1180 if (route->enabled == _enabled)
1181 continue;
1182
1183 if (_enabled) {
1184 if (!(route->flags & DEVROUTE_METRIC))
1185 route->metric = ip->iface->metric;
1186
1187 if (system_add_route(dev, route))
1188 route->failed = true;
1189 } else
1190 system_del_route(dev, route);
1191 route->enabled = _enabled;
1192 }
1193
1194 struct device_prefix *c;
1195 struct device_prefix_assignment *a;
1196 list_for_each_entry(c, &prefixes, head)
1197 list_for_each_entry(a, &c->assignments, head)
1198 if (!strcmp(a->name, ip->iface->name))
1199 interface_set_prefix_address(a, c, ip->iface, enabled);
1200
1201 if (ip->iface && ip->iface->l3_dev.dev) {
1202 set_ip_lo_policy(enabled, true, ip->iface);
1203 set_ip_lo_policy(enabled, false, ip->iface);
1204
1205 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1206 NULL, 0, 0, ip->iface, "failed_policy");
1207 }
1208 }
1209
1210 void
1211 interface_ip_update_start(struct interface_ip_settings *ip)
1212 {
1213 if (ip != &ip->iface->config_ip) {
1214 vlist_simple_update(&ip->dns_servers);
1215 vlist_simple_update(&ip->dns_search);
1216 }
1217 vlist_update(&ip->route);
1218 vlist_update(&ip->addr);
1219 vlist_update(&ip->prefix);
1220 }
1221
1222 void
1223 interface_ip_update_complete(struct interface_ip_settings *ip)
1224 {
1225 vlist_simple_flush(&ip->dns_servers);
1226 vlist_simple_flush(&ip->dns_search);
1227 vlist_flush(&ip->route);
1228 vlist_flush(&ip->addr);
1229 vlist_flush(&ip->prefix);
1230 interface_write_resolv_conf();
1231 }
1232
1233 void
1234 interface_ip_flush(struct interface_ip_settings *ip)
1235 {
1236 if (ip == &ip->iface->proto_ip)
1237 vlist_flush_all(&ip->iface->host_routes);
1238 vlist_simple_flush_all(&ip->dns_servers);
1239 vlist_simple_flush_all(&ip->dns_search);
1240 vlist_flush_all(&ip->route);
1241 vlist_flush_all(&ip->addr);
1242 vlist_flush_all(&ip->prefix);
1243 }
1244
1245 static void
1246 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1247 {
1248 ip->iface = iface;
1249 ip->enabled = true;
1250 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1251 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1252 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1253 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1254 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1255 }
1256
1257 void
1258 interface_ip_init(struct interface *iface)
1259 {
1260 __interface_ip_init(&iface->proto_ip, iface);
1261 __interface_ip_init(&iface->config_ip, iface);
1262 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1263 }
1264
1265 static void
1266 interface_ip_valid_until_handler(struct uloop_timeout *t)
1267 {
1268 time_t now = system_get_rtime();
1269 struct interface *iface;
1270 vlist_for_each_element(&interfaces, iface, node) {
1271 if (iface->state != IFS_UP)
1272 continue;
1273
1274 struct device_addr *addr, *addrp;
1275 struct device_route *route, *routep;
1276 struct device_prefix *pref, *prefp;
1277
1278 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1279 if (addr->valid_until && addr->valid_until < now)
1280 vlist_delete(&iface->proto_ip.addr, &addr->node);
1281
1282 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1283 if (route->valid_until && route->valid_until < now)
1284 vlist_delete(&iface->proto_ip.route, &route->node);
1285
1286 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1287 if (pref->valid_until && pref->valid_until < now)
1288 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1289
1290 }
1291
1292 uloop_timeout_set(t, 1000);
1293 }
1294
1295 static void __init
1296 interface_ip_init_worker(void)
1297 {
1298 valid_until_timeout.cb = interface_ip_valid_until_handler;
1299 uloop_timeout_set(&valid_until_timeout, 1000);
1300 }
OpenWrt Network interface configuration daemon