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[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 #include <unistd.h>
19
20 #include <arpa/inet.h>
21
22 #include "netifd.h"
23 #include "device.h"
24 #include "interface.h"
25 #include "interface-ip.h"
26 #include "proto.h"
27 #include "ubus.h"
28 #include "system.h"
29
30 enum {
31 ROUTE_INTERFACE,
32 ROUTE_TARGET,
33 ROUTE_MASK,
34 ROUTE_GATEWAY,
35 ROUTE_METRIC,
36 ROUTE_MTU,
37 ROUTE_VALID,
38 ROUTE_TABLE,
39 __ROUTE_MAX
40 };
41
42 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
43 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
44 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
45 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
46 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
47 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
48 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
49 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
50 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
51 };
52
53 const struct config_param_list route_attr_list = {
54 .n_params = __ROUTE_MAX,
55 .params = route_attr,
56 };
57
58
59 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
60 static struct device_prefix *ula_prefix = NULL;
61 static struct uloop_timeout valid_until_timeout;
62
63
64 static void
65 clear_if_addr(union if_addr *a, int mask)
66 {
67 int m_bytes = (mask + 7) / 8;
68 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
69 uint8_t *p = (uint8_t *) a;
70
71 if (m_bytes < sizeof(a))
72 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
73
74 p[m_bytes - 1] &= ~m_clear;
75 }
76
77 static bool
78 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
79 {
80 union if_addr *p1, *p2;
81
82 p1 = alloca(sizeof(*a1));
83 p2 = alloca(sizeof(*a2));
84
85 memcpy(p1, a1, sizeof(*a1));
86 clear_if_addr(p1, mask);
87 memcpy(p2, a2, sizeof(*a2));
88 clear_if_addr(p2, mask);
89
90 return !memcmp(p1, p2, sizeof(*p1));
91 }
92
93 static int set_ipv6_source_policy(bool add, const union if_addr *addr, uint8_t mask, int ifindex)
94 {
95 struct iprule rule = {
96 .flags = IPRULE_INET6 | IPRULE_SRC | IPRULE_LOOKUP | IPRULE_PRIORITY,
97 .priority = 65535,
98 .lookup = interface_ip_resolve_v6_rtable(ifindex),
99 .src_addr = *addr,
100 .src_mask = mask,
101 };
102
103 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
104 }
105
106 static int set_ipv6_lo_policy(bool add, int ifindex)
107 {
108 struct iprule rule = {
109 .flags = IPRULE_INET6 | IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
110 .priority = 65535,
111 .lookup = interface_ip_resolve_v6_rtable(ifindex),
112 .in_dev = "lo"
113 };
114
115 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
116 }
117
118 static bool
119 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
120 {
121 struct device_addr *addr;
122
123 vlist_for_each_element(&ip->addr, addr, node) {
124 if (!addr->enabled)
125 continue;
126
127 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
128 continue;
129
130 // Handle offlink addresses correctly
131 unsigned int mask = addr->mask;
132 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
133 (addr->flags & DEVADDR_OFFLINK))
134 mask = 128;
135
136 if (!match_if_addr(&addr->addr, a, mask))
137 continue;
138
139 return true;
140 }
141
142 return false;
143 }
144
145 static void
146 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
147 bool v6, struct device_route **res)
148 {
149 struct device_route *route;
150
151 vlist_for_each_element(&ip->route, route, node) {
152 if (!route->enabled)
153 continue;
154
155 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
156 continue;
157
158 if (!match_if_addr(&route->addr, a, route->mask))
159 continue;
160
161 if (route->flags & DEVROUTE_TABLE)
162 continue;
163
164 if (!*res || route->mask < (*res)->mask)
165 *res = route;
166 }
167 }
168
169 static bool
170 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
171 {
172 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
173 __find_ip_addr_target(&iface->config_ip, a, v6);
174 }
175
176 static void
177 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
178 bool v6, struct device_route **route)
179 {
180 __find_ip_route_target(&iface->proto_ip, a, v6, route);
181 __find_ip_route_target(&iface->config_ip, a, v6, route);
182 }
183
184 struct interface *
185 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
186 {
187 struct device_route *route, *r_next = NULL;
188 bool defaultroute_target = false;
189 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
190
191 route = calloc(1, sizeof(*route));
192 if (!route)
193 return NULL;
194
195 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
196 route->mask = v6 ? 128 : 32;
197 if (memcmp(&route->addr, addr, addrsize) == 0)
198 defaultroute_target = true;
199 else
200 memcpy(&route->addr, addr, addrsize);
201
202 if (iface) {
203 /* look for locally addressable target first */
204 if (interface_ip_find_addr_target(iface, addr, v6))
205 goto done;
206
207 /* do not stop at the first route, let the lookup compare
208 * masks to find the best match */
209 interface_ip_find_route_target(iface, addr, v6, &r_next);
210 } else {
211 vlist_for_each_element(&interfaces, iface, node) {
212 /* look for locally addressable target first */
213 if (interface_ip_find_addr_target(iface, addr, v6))
214 goto done;
215
216 /* do not stop at the first route, let the lookup compare
217 * masks to find the best match */
218 interface_ip_find_route_target(iface, addr, v6, &r_next);
219 }
220 }
221
222 if (!r_next) {
223 free(route);
224 return NULL;
225 }
226
227 iface = r_next->iface;
228 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
229 route->mtu = r_next->mtu;
230 route->metric = r_next->metric;
231 route->table = r_next->table;
232
233 done:
234 route->iface = iface;
235 if (defaultroute_target)
236 free(route);
237 else
238 vlist_add(&iface->host_routes, &route->node, route);
239 return iface;
240 }
241
242 void
243 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
244 {
245 struct interface_ip_settings *ip;
246 struct blob_attr *tb[__ROUTE_MAX], *cur;
247 struct device_route *route;
248 int af = v6 ? AF_INET6 : AF_INET;
249 bool is_v6_proto_route = v6 && iface;
250
251 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
252
253 if (!iface) {
254 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
255 return;
256
257 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
258 if (!iface)
259 return;
260
261 ip = &iface->config_ip;
262 } else {
263 ip = &iface->proto_ip;
264 }
265
266 route = calloc(1, sizeof(*route));
267 if (!route)
268 return;
269
270 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
271 route->mask = v6 ? 128 : 32;
272 if ((cur = tb[ROUTE_MASK]) != NULL) {
273 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
274 if (route->mask > (v6 ? 128 : 32))
275 goto error;
276 }
277
278 if ((cur = tb[ROUTE_TARGET]) != NULL) {
279 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
280 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
281 goto error;
282 }
283 }
284
285 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
286 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
287 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
288 goto error;
289 }
290 }
291
292 if ((cur = tb[ROUTE_METRIC]) != NULL) {
293 route->metric = blobmsg_get_u32(cur);
294 route->flags |= DEVROUTE_METRIC;
295 }
296
297 if ((cur = tb[ROUTE_MTU]) != NULL) {
298 route->mtu = blobmsg_get_u32(cur);
299 route->flags |= DEVROUTE_MTU;
300 }
301
302 // Use source-based routing
303 if (is_v6_proto_route) {
304 route->table = interface_ip_resolve_v6_rtable(iface->l3_dev.dev->ifindex);
305 route->flags |= DEVROUTE_SRCTABLE;
306 }
307
308 if ((cur = tb[ROUTE_TABLE]) != NULL) {
309 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
310 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
311 goto error;
312 }
313
314 if (route->table)
315 route->flags |= DEVROUTE_TABLE;
316 }
317
318 if ((cur = tb[ROUTE_VALID]) != NULL)
319 route->valid_until = system_get_rtime() + blobmsg_get_u32(cur);
320
321 vlist_add(&ip->route, &route->node, route);
322 return;
323
324 error:
325 free(route);
326 }
327
328 static int
329 addr_cmp(const void *k1, const void *k2, void *ptr)
330 {
331 return memcmp(k1, k2, sizeof(struct device_addr) -
332 offsetof(struct device_addr, flags));
333 }
334
335 static int
336 route_cmp(const void *k1, const void *k2, void *ptr)
337 {
338 const struct device_route *r1 = k1, *r2 = k2;
339
340 if (r1->mask != r2->mask)
341 return r2->mask - r1->mask;
342
343 if (r1->metric != r2->metric)
344 return r1->metric - r2->metric;
345
346 if (r1->flags != r2->flags)
347 return r2->flags - r1->flags;
348
349 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
350 }
351
352 static int
353 prefix_cmp(const void *k1, const void *k2, void *ptr)
354 {
355 return memcmp(k1, k2, sizeof(struct device_prefix) -
356 offsetof(struct device_prefix, addr));
357 }
358
359 static void
360 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
361 {
362 struct device *dev = iface->l3_dev.dev;
363 struct device_route route;
364
365 memset(&route, 0, sizeof(route));
366 route.iface = iface;
367 route.flags = addr->flags;
368 route.mask = addr->mask;
369 memcpy(&route.addr, &addr->addr, sizeof(route.addr));
370 clear_if_addr(&route.addr, route.mask);
371
372 if (add) {
373 route.flags |= DEVADDR_KERNEL;
374 system_del_route(dev, &route);
375
376 if (!(addr->flags & DEVADDR_OFFLINK)) {
377 route.flags &= ~DEVADDR_KERNEL;
378 route.metric = iface->metric;
379 system_add_route(dev, &route);
380 }
381 } else {
382 if (!(addr->flags & DEVADDR_OFFLINK))
383 system_del_route(dev, &route);
384 }
385 }
386
387 static void
388 interface_update_proto_addr(struct vlist_tree *tree,
389 struct vlist_node *node_new,
390 struct vlist_node *node_old)
391 {
392 struct interface_ip_settings *ip;
393 struct interface *iface;
394 struct device *dev;
395 struct device_addr *a_new = NULL, *a_old = NULL;
396 bool keep = false;
397
398 ip = container_of(tree, struct interface_ip_settings, addr);
399 iface = ip->iface;
400 dev = iface->l3_dev.dev;
401
402 if (node_new) {
403 a_new = container_of(node_new, struct device_addr, node);
404
405 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
406 !a_new->broadcast) {
407
408 uint32_t mask = ~0;
409 uint32_t *a = (uint32_t *) &a_new->addr;
410
411 mask >>= a_new->mask;
412 a_new->broadcast = *a | htonl(mask);
413 }
414 }
415
416 if (node_old)
417 a_old = container_of(node_old, struct device_addr, node);
418
419 if (a_new && a_old) {
420 keep = true;
421
422 if (a_old->flags != a_new->flags ||
423 a_old->valid_until != a_new->valid_until ||
424 a_old->preferred_until != a_new->preferred_until)
425 keep = false;
426
427 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
428 a_new->broadcast != a_old->broadcast)
429 keep = false;
430 }
431
432 if (node_old) {
433 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
434 interface_handle_subnet_route(iface, a_old, false);
435
436 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
437 set_ipv6_source_policy(false, &a_old->addr, a_old->mask, dev->ifindex);
438
439 system_del_address(dev, a_old);
440 }
441 free(a_old);
442 }
443
444 if (node_new) {
445 a_new->enabled = true;
446 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
447 system_add_address(dev, a_new);
448
449 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
450 set_ipv6_source_policy(true, &a_new->addr, a_new->mask, dev->ifindex);
451
452 if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
453 interface_handle_subnet_route(iface, a_new, true);
454 }
455 }
456 }
457
458 static bool
459 enable_route(struct interface_ip_settings *ip, struct device_route *route)
460 {
461 if (ip->no_defaultroute && !route->mask)
462 return false;
463
464 return ip->enabled;
465 }
466
467 static void
468 interface_update_proto_route(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_route *route_old, *route_new;
476 bool keep = false;
477
478 ip = container_of(tree, struct interface_ip_settings, route);
479 iface = ip->iface;
480 dev = iface->l3_dev.dev;
481
482 route_old = container_of(node_old, struct device_route, node);
483 route_new = container_of(node_new, struct device_route, node);
484
485 if (node_old && node_new)
486 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
487
488 if (node_old) {
489 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
490 system_del_route(dev, route_old);
491 free(route_old);
492 }
493
494 if (node_new) {
495 bool _enabled = enable_route(ip, route_new);
496
497 if (!(route_new->flags & DEVROUTE_METRIC))
498 route_new->metric = iface->metric;
499
500 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
501 system_add_route(dev, route_new);
502
503 route_new->iface = iface;
504 route_new->enabled = _enabled;
505 }
506 }
507
508 static void
509 interface_update_host_route(struct vlist_tree *tree,
510 struct vlist_node *node_new,
511 struct vlist_node *node_old)
512 {
513 struct interface *iface;
514 struct device *dev;
515 struct device_route *route_old, *route_new;
516
517 iface = container_of(tree, struct interface, host_routes);
518 dev = iface->l3_dev.dev;
519
520 route_old = container_of(node_old, struct device_route, node);
521 route_new = container_of(node_new, struct device_route, node);
522
523 if (node_old) {
524 system_del_route(dev, route_old);
525 free(route_old);
526 }
527
528 if (node_new)
529 system_add_route(dev, route_new);
530 }
531
532
533 static void
534 interface_set_prefix_address(struct device_prefix_assignment *assignment,
535 const struct device_prefix *prefix, struct interface *iface, bool add);
536
537 static void interface_trigger_ula_prefix(struct interface *iface,
538 const struct device_prefix *prefix, bool enable)
539 {
540 if (prefix == ula_prefix || (prefix->addr.s6_addr[0] & 0xfe) != 0xfc)
541 return;
542
543 bool external_ula = false;
544 struct device_prefix_assignment *ula_assign = NULL;
545 struct device_prefix *c;
546 list_for_each_entry(c, &prefixes, head) {
547 if (c != ula_prefix && (c->addr.s6_addr[0] & 0xfe) != 0xfc)
548 continue;
549
550 struct device_prefix_assignment *a;
551 list_for_each_entry(a, &c->assignments, head) {
552 if (!strcmp(a->name, iface->name)) {
553 if (c == ula_prefix)
554 ula_assign = a;
555 else if (a->enabled)
556 external_ula = true;
557 }
558 }
559
560 }
561
562 // Remove ULA assignment if there is an externally managed ULA and vice versa
563 if (ula_assign && ((enable && !external_ula) || (!enable && external_ula)))
564 interface_set_prefix_address(ula_assign, ula_prefix, iface, enable);
565 }
566
567
568 static void
569 interface_set_prefix_address(struct device_prefix_assignment *assignment,
570 const struct device_prefix *prefix, struct interface *iface, bool add)
571 {
572 const struct interface *uplink = prefix->iface;
573 if (!iface->l3_dev.dev)
574 return;
575
576 struct device *l3_downlink = iface->l3_dev.dev;
577
578 struct device_addr addr;
579 memset(&addr, 0, sizeof(addr));
580 addr.addr.in6 = prefix->addr;
581 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
582 addr.addr.in6.s6_addr[15] += 1;
583 addr.mask = assignment->length;
584 addr.flags = DEVADDR_INET6;
585 addr.preferred_until = prefix->preferred_until;
586 addr.valid_until = prefix->valid_until;
587
588 if (!add && assignment->enabled) {
589 time_t now = system_get_rtime();
590 addr.preferred_until = now;
591 if (!addr.valid_until || addr.valid_until - now > 7200)
592 addr.valid_until = now + 7200;
593 system_add_address(l3_downlink, &addr);
594 assignment->enabled = false;
595
596 interface_trigger_ula_prefix(iface, prefix, true);
597 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
598 system_add_address(l3_downlink, &addr);
599 if (uplink && uplink->l3_dev.dev) {
600 int mtu = system_update_ipv6_mtu(
601 uplink->l3_dev.dev, 0);
602 if (mtu > 0)
603 system_update_ipv6_mtu(l3_downlink, mtu);
604 }
605 assignment->enabled = true;
606
607 interface_trigger_ula_prefix(iface, prefix, false);
608 }
609 }
610
611 static bool interface_prefix_assign(struct list_head *list,
612 struct device_prefix_assignment *assign)
613 {
614 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
615 struct device_prefix_assignment *c;
616 list_for_each_entry(c, list, head) {
617 if (assign->assigned != -1) {
618 if (assign->assigned > current && assign->assigned + asize < c->assigned) {
619 list_add_tail(&assign->head, &c->head);
620 return true;
621 }
622 } else if (assign->assigned == -1) {
623 current = (current + asize) & (~asize);
624 if (current + asize < c->assigned) {
625 assign->assigned = current;
626 list_add_tail(&assign->head, &c->head);
627 return true;
628 }
629 }
630 current = (c->assigned + (1 << (64 - c->length)));
631 }
632 return false;
633 }
634
635 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
636 {
637 struct device_prefix_assignment *c;
638 struct interface *iface;
639
640 // Delete all assignments
641 while (!list_empty(&prefix->assignments)) {
642 c = list_first_entry(&prefix->assignments,
643 struct device_prefix_assignment, head);
644 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
645 interface_set_prefix_address(c, prefix, iface, false);
646 list_del(&c->head);
647 free(c);
648 }
649
650 if (!setup)
651 return;
652
653 // End-of-assignment sentinel
654 c = malloc(sizeof(*c) + 1);
655 c->assigned = 1 << (64 - prefix->length);
656 c->length = 64;
657 c->name[0] = 0;
658 list_add(&c->head, &prefix->assignments);
659
660 // Excluded prefix
661 if (prefix->excl_length > 0) {
662 const char name[] = "!excluded";
663 c = malloc(sizeof(*c) + sizeof(name));
664 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
665 ((1 << (64 - prefix->length)) - 1);
666 c->length = prefix->excl_length;
667 memcpy(c->name, name, sizeof(name));
668 list_add(&c->head, &prefix->assignments);
669 }
670
671 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
672 vlist_for_each_element(&interfaces, iface, node) {
673 if (iface->config_ip.assignment_length < 48 ||
674 iface->config_ip.assignment_length > 64)
675 continue;
676
677 size_t namelen = strlen(iface->name) + 1;
678 c = malloc(sizeof(*c) + namelen);
679 c->length = iface->config_ip.assignment_length;
680 c->assigned = iface->config_ip.assignment_hint;
681 c->enabled = false;
682 memcpy(c->name, iface->name, namelen);
683
684 // First process all custom assignments, put all others in later-list
685 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
686 if (c->assigned != -1) {
687 c->assigned = -1;
688 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
689 "of size %hhu for %s, trying other\n", c->length, c->name);
690 }
691 list_add_tail(&c->head, &assign_later);
692 }
693 }
694
695 // Then try to assign all other + failed custom assignments
696 while (!list_empty(&assign_later)) {
697 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
698 list_del(&c->head);
699
700 bool assigned = false;
701 do {
702 assigned = interface_prefix_assign(&prefix->assignments, c);
703 } while (!assigned && ++c->length <= 64);
704
705 if (!assigned) {
706 netifd_log_message(L_WARNING, "Failed to assign subprefix "
707 "of size %hhu for %s\n", c->length, c->name);
708 free(c);
709 }
710 }
711
712 list_for_each_entry(c, &prefix->assignments, head)
713 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
714 interface_set_prefix_address(c, prefix, iface, true);
715 }
716
717
718 void interface_refresh_assignments(bool hint)
719 {
720 static bool refresh = false;
721 if (!hint && refresh) {
722 struct device_prefix *p;
723 list_for_each_entry(p, &prefixes, head)
724 interface_update_prefix_assignments(p, true);
725 }
726 refresh = hint;
727 }
728
729
730 static void
731 interface_update_prefix(struct vlist_tree *tree,
732 struct vlist_node *node_new,
733 struct vlist_node *node_old)
734 {
735 struct device_prefix *prefix_old, *prefix_new;
736 prefix_old = container_of(node_old, struct device_prefix, node);
737 prefix_new = container_of(node_new, struct device_prefix, node);
738
739 struct device_route route;
740 memset(&route, 0, sizeof(route));
741 route.flags = DEVADDR_INET6;
742 route.metric = INT32_MAX;
743 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
744 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
745
746
747 struct device_prefix_assignment *c;
748 struct interface *iface;
749
750 if (node_old && node_new) {
751 // Move assignments and refresh addresses to update valid times
752 list_splice(&prefix_old->assignments, &prefix_new->assignments);
753
754 list_for_each_entry(c, &prefix_new->assignments, head)
755 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
756 interface_set_prefix_address(c, prefix_new, iface, true);
757 } else if (node_new) {
758 // Set null-route to avoid routing loops and set routing policy
759 system_add_route(NULL, &route);
760 if (prefix_new->iface)
761 set_ipv6_source_policy(true, &route.addr, route.mask,
762 prefix_new->iface->l3_dev.dev->ifindex);
763
764
765 interface_update_prefix_assignments(prefix_new, true);
766 } else if (node_old) {
767 interface_update_prefix_assignments(prefix_old, false);
768
769 // Remove null-route
770 if (prefix_old->iface)
771 set_ipv6_source_policy(false, &route.addr, route.mask,
772 prefix_old->iface->l3_dev.dev->ifindex);
773 system_del_route(NULL, &route);
774 }
775
776 if (node_old) {
777 list_del(&prefix_old->head);
778 free(prefix_old);
779 }
780
781 if (node_new)
782 list_add(&prefix_new->head, &prefixes);
783
784 }
785
786 struct device_prefix*
787 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
788 uint8_t length, time_t valid_until, time_t preferred_until,
789 struct in6_addr *excl_addr, uint8_t excl_length)
790 {
791 struct device_prefix *prefix = calloc(1, sizeof(*prefix));
792 prefix->length = length;
793 prefix->addr = *addr;
794 prefix->preferred_until = preferred_until;
795 prefix->valid_until = valid_until;
796 prefix->iface = iface;
797 INIT_LIST_HEAD(&prefix->assignments);
798
799 if (excl_addr) {
800 prefix->excl_addr = *excl_addr;
801 prefix->excl_length = excl_length;
802 }
803
804 if (iface)
805 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
806 else
807 interface_update_prefix(NULL, &prefix->node, NULL);
808
809 return prefix;
810 }
811
812 void
813 interface_ip_set_ula_prefix(const char *prefix)
814 {
815 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
816 if (prefix)
817 strncpy(buf, prefix, sizeof(buf) - 1);
818 char *prefixaddr = strtok_r(buf, "/", &saveptr);
819
820 struct in6_addr addr;
821 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
822 if (ula_prefix) {
823 interface_update_prefix(NULL, NULL, &ula_prefix->node);
824 ula_prefix = NULL;
825 }
826 return;
827 }
828
829 int length;
830 char *prefixlen = strtok_r(NULL, ",", &saveptr);
831 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
832 return;
833
834 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
835 ula_prefix->length != length) {
836 if (ula_prefix)
837 interface_update_prefix(NULL, NULL, &ula_prefix->node);
838
839 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
840 0, 0, NULL, 0);
841 }
842 }
843
844 int interface_ip_resolve_v6_rtable(int ifindex)
845 {
846 return ifindex + 1000;
847 }
848
849 void
850 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
851 {
852 struct dns_server *s;
853
854 s = calloc(1, sizeof(*s));
855 if (!s)
856 return;
857
858 s->af = AF_INET;
859 if (inet_pton(s->af, str, &s->addr.in))
860 goto add;
861
862 s->af = AF_INET6;
863 if (inet_pton(s->af, str, &s->addr.in))
864 goto add;
865
866 free(s);
867 return;
868
869 add:
870 D(INTERFACE, "Add IPv%c DNS server: %s\n",
871 s->af == AF_INET6 ? '6' : '4', str);
872 vlist_simple_add(&ip->dns_servers, &s->node);
873 }
874
875 void
876 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
877 {
878 struct blob_attr *cur;
879 int rem;
880
881 blobmsg_for_each_attr(cur, list, rem) {
882 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
883 continue;
884
885 if (!blobmsg_check_attr(cur, NULL))
886 continue;
887
888 interface_add_dns_server(ip, blobmsg_data(cur));
889 }
890 }
891
892 static void
893 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
894 {
895 struct dns_search_domain *s;
896 int len = strlen(str);
897
898 s = calloc(1, sizeof(*s) + len + 1);
899 if (!s)
900 return;
901
902 D(INTERFACE, "Add DNS search domain: %s\n", str);
903 memcpy(s->name, str, len);
904 vlist_simple_add(&ip->dns_search, &s->node);
905 }
906
907 void
908 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
909 {
910 struct blob_attr *cur;
911 int rem;
912
913 blobmsg_for_each_attr(cur, list, rem) {
914 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
915 continue;
916
917 if (!blobmsg_check_attr(cur, NULL))
918 continue;
919
920 interface_add_dns_search_domain(ip, blobmsg_data(cur));
921 }
922 }
923
924 static void
925 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
926 {
927 struct dns_server *s;
928 struct dns_search_domain *d;
929 const char *str;
930 char buf[INET6_ADDRSTRLEN];
931
932 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
933 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
934 if (!str)
935 continue;
936
937 fprintf(f, "nameserver %s\n", str);
938 }
939
940 vlist_simple_for_each_element(&ip->dns_search, d, node) {
941 fprintf(f, "search %s\n", d->name);
942 }
943 }
944
945 void
946 interface_write_resolv_conf(void)
947 {
948 struct interface *iface;
949 char *path = alloca(strlen(resolv_conf) + 5);
950 FILE *f;
951 uint32_t crcold, crcnew;
952
953 sprintf(path, "%s.tmp", resolv_conf);
954 unlink(path);
955 f = fopen(path, "w+");
956 if (!f) {
957 D(INTERFACE, "Failed to open %s for writing\n", path);
958 return;
959 }
960
961 vlist_for_each_element(&interfaces, iface, node) {
962 if (iface->state != IFS_UP)
963 continue;
964
965 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
966 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
967 vlist_simple_empty(&iface->config_ip.dns_search) &&
968 vlist_simple_empty(&iface->config_ip.dns_servers))
969 continue;
970
971 fprintf(f, "# Interface %s\n", iface->name);
972 write_resolv_conf_entries(f, &iface->config_ip);
973 if (!iface->proto_ip.no_dns)
974 write_resolv_conf_entries(f, &iface->proto_ip);
975 }
976 fflush(f);
977 rewind(f);
978 crcnew = crc32_file(f);
979 fclose(f);
980
981 crcold = crcnew + 1;
982 f = fopen(resolv_conf, "r");
983 if (f) {
984 crcold = crc32_file(f);
985 fclose(f);
986 }
987
988 if (crcold == crcnew) {
989 unlink(path);
990 } else if (rename(path, resolv_conf) < 0) {
991 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
992 unlink(path);
993 }
994 }
995
996 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
997 {
998 struct device_addr *addr;
999 struct device_route *route;
1000 struct device *dev;
1001
1002 ip->enabled = enabled;
1003 dev = ip->iface->l3_dev.dev;
1004 if (!dev)
1005 return;
1006
1007 vlist_for_each_element(&ip->addr, addr, node) {
1008 if (addr->enabled == enabled)
1009 continue;
1010
1011 if (enabled)
1012 system_add_address(dev, addr);
1013 else
1014 system_del_address(dev, addr);
1015 addr->enabled = enabled;
1016 }
1017
1018 vlist_for_each_element(&ip->route, route, node) {
1019 bool _enabled = enabled;
1020
1021 if (!enable_route(ip, route))
1022 _enabled = false;
1023
1024 if (route->enabled == _enabled)
1025 continue;
1026
1027 if (_enabled) {
1028 if (!(route->flags & DEVROUTE_METRIC))
1029 route->metric = ip->iface->metric;
1030
1031 system_add_route(dev, route);
1032 } else
1033 system_del_route(dev, route);
1034 route->enabled = _enabled;
1035 }
1036
1037 struct device_prefix *c;
1038 struct device_prefix_assignment *a;
1039 list_for_each_entry(c, &prefixes, head)
1040 list_for_each_entry(a, &c->assignments, head)
1041 if (!strcmp(a->name, ip->iface->name))
1042 interface_set_prefix_address(a, c, ip->iface, enabled);
1043
1044 set_ipv6_lo_policy(enabled, dev->ifindex);
1045 }
1046
1047 void
1048 interface_ip_update_start(struct interface_ip_settings *ip)
1049 {
1050 if (ip != &ip->iface->config_ip) {
1051 vlist_simple_update(&ip->dns_servers);
1052 vlist_simple_update(&ip->dns_search);
1053 }
1054 vlist_update(&ip->route);
1055 vlist_update(&ip->addr);
1056 vlist_update(&ip->prefix);
1057 }
1058
1059 void
1060 interface_ip_update_complete(struct interface_ip_settings *ip)
1061 {
1062 vlist_simple_flush(&ip->dns_servers);
1063 vlist_simple_flush(&ip->dns_search);
1064 vlist_flush(&ip->route);
1065 vlist_flush(&ip->addr);
1066 vlist_flush(&ip->prefix);
1067 interface_write_resolv_conf();
1068 }
1069
1070 void
1071 interface_ip_flush(struct interface_ip_settings *ip)
1072 {
1073 if (ip == &ip->iface->proto_ip)
1074 vlist_flush_all(&ip->iface->host_routes);
1075 vlist_simple_flush_all(&ip->dns_servers);
1076 vlist_simple_flush_all(&ip->dns_search);
1077 vlist_flush_all(&ip->route);
1078 vlist_flush_all(&ip->addr);
1079 vlist_flush_all(&ip->prefix);
1080 }
1081
1082 static void
1083 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1084 {
1085 ip->iface = iface;
1086 ip->enabled = true;
1087 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1088 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1089 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1090 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1091 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1092 }
1093
1094 void
1095 interface_ip_init(struct interface *iface)
1096 {
1097 __interface_ip_init(&iface->proto_ip, iface);
1098 __interface_ip_init(&iface->config_ip, iface);
1099 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1100
1101 }
1102
1103 static void
1104 interface_ip_valid_until_handler(struct uloop_timeout *t)
1105 {
1106 time_t now = system_get_rtime();
1107 struct interface *iface;
1108 vlist_for_each_element(&interfaces, iface, node) {
1109 if (iface->state != IFS_UP)
1110 continue;
1111
1112 struct device_addr *addr, *addrp;
1113 struct device_route *route, *routep;
1114 struct device_prefix *pref, *prefp;
1115
1116 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1117 if (addr->valid_until && addr->valid_until < now)
1118 vlist_delete(&iface->proto_ip.addr, &addr->node);
1119
1120 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1121 if (route->valid_until && route->valid_until < now)
1122 vlist_delete(&iface->proto_ip.route, &route->node);
1123
1124 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1125 if (pref->valid_until && pref->valid_until < now)
1126 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1127
1128 }
1129
1130 uloop_timeout_set(t, 1000);
1131 }
1132
1133 static void __init
1134 interface_ip_init_worker(void)
1135 {
1136 valid_until_timeout.cb = interface_ip_valid_until_handler;
1137 uloop_timeout_set(&valid_until_timeout, 1000);
1138 }
OpenWrt Network interface configuration daemon