projects / project / netifd.git / blob
? search:


7e60f64990cc6815c5c16d3a1e618152b98a571e
[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 <libgen.h>
19 #include <sys/stat.h>
20
21 #include <limits.h>
22 #include <arpa/inet.h>
23 #include <netinet/in.h>
24
25 #include "netifd.h"
26 #include "device.h"
27 #include "interface.h"
28 #include "interface-ip.h"
29 #include "proto.h"
30 #include "ubus.h"
31 #include "system.h"
32
33 enum {
34 ROUTE_INTERFACE,
35 ROUTE_TARGET,
36 ROUTE_MASK,
37 ROUTE_GATEWAY,
38 ROUTE_METRIC,
39 ROUTE_MTU,
40 ROUTE_VALID,
41 ROUTE_TABLE,
42 ROUTE_SOURCE,
43 ROUTE_ONLINK,
44 ROUTE_TYPE,
45 ROUTE_PROTO,
46 ROUTE_DISABLED,
47 __ROUTE_MAX
48 };
49
50 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
51 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
52 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
53 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
54 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
55 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
56 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
57 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
58 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
59 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
60 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
61 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
62 [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
63 [ROUTE_DISABLED] = { .name = "disabled", .type = BLOBMSG_TYPE_BOOL },
64 };
65
66 const struct uci_blob_param_list route_attr_list = {
67 .n_params = __ROUTE_MAX,
68 .params = route_attr,
69 };
70
71 enum {
72 NEIGHBOR_INTERFACE,
73 NEIGHBOR_ADDRESS,
74 NEIGHBOR_MAC,
75 NEIGHBOR_PROXY,
76 NEIGHBOR_ROUTER,
77 __NEIGHBOR_MAX
78 };
79
80 static const struct blobmsg_policy neighbor_attr[__NEIGHBOR_MAX]={
81 [NEIGHBOR_INTERFACE]= { .name = "interface", .type = BLOBMSG_TYPE_STRING},
82 [NEIGHBOR_ADDRESS]= { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING},
83 [NEIGHBOR_MAC]= { .name = "mac", .type = BLOBMSG_TYPE_STRING},
84 [NEIGHBOR_PROXY]= { .name = "proxy", .type = BLOBMSG_TYPE_BOOL},
85 [NEIGHBOR_ROUTER]= {.name = "router", .type = BLOBMSG_TYPE_BOOL},
86 };
87
88 const struct uci_blob_param_list neighbor_attr_list = {
89 .n_params = __NEIGHBOR_MAX,
90 .params = neighbor_attr,
91 };
92
93
94 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
95 static struct device_prefix *ula_prefix = NULL;
96 static struct uloop_timeout valid_until_timeout;
97
98
99 static void
100 clear_if_addr(union if_addr *a, int mask)
101 {
102 size_t m_bytes = (mask + 7) / 8;
103 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
104 uint8_t *p = (uint8_t *) a;
105
106 if (m_bytes < sizeof(*a))
107 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
108
109 p[m_bytes - 1] &= ~m_clear;
110 }
111
112 static bool
113 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
114 {
115 union if_addr *p1, *p2;
116
117 p1 = alloca(sizeof(*a1));
118 p2 = alloca(sizeof(*a2));
119
120 memcpy(p1, a1, sizeof(*a1));
121 clear_if_addr(p1, mask);
122 memcpy(p2, a2, sizeof(*a2));
123 clear_if_addr(p2, mask);
124
125 return !memcmp(p1, p2, sizeof(*p1));
126 }
127
128 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
129 const union if_addr *addr, uint8_t mask, unsigned int table,
130 struct interface *in_iface, const char *action, bool src)
131 {
132 struct iprule rule = {
133 .flags = IPRULE_PRIORITY,
134 .priority = priority
135 };
136
137 if (addr) {
138 if (src) {
139 rule.flags |= IPRULE_SRC;
140 rule.src_addr = *addr;
141 rule.src_mask = mask;
142 } else {
143 rule.flags |= IPRULE_DEST;
144 rule.dest_addr = *addr;
145 rule.dest_mask = mask;
146 }
147 }
148
149 if (table) {
150 rule.flags |= IPRULE_LOOKUP;
151 rule.lookup = table;
152
153 if (!rule.lookup)
154 return 0;
155 } else if (action) {
156 rule.flags |= IPRULE_ACTION;
157 system_resolve_iprule_action(action, &rule.action);
158 }
159
160 if (in_iface && in_iface->l3_dev.dev) {
161 rule.flags |= IPRULE_IN;
162 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
163 }
164
165 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
166
167 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
168 }
169
170 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
171 {
172 struct iprule rule = {
173 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
174 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
175 .lookup = (v6) ? iface->ip6table : iface->ip4table,
176 .in_dev = "lo"
177 };
178
179 if (!rule.lookup)
180 return 0;
181
182 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
183
184 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
185 }
186
187 static bool
188 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
189 {
190 struct device_addr *addr;
191
192 vlist_for_each_element(&ip->addr, addr, node) {
193 if (!addr->enabled)
194 continue;
195
196 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
197 continue;
198
199 if (((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
200 addr->point_to_point && a->in.s_addr == addr->point_to_point)
201 return true;
202
203 /* Handle offlink addresses correctly */
204 unsigned int mask = addr->mask;
205 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
206 (addr->flags & DEVADDR_OFFLINK))
207 mask = 128;
208
209 if (!match_if_addr(&addr->addr, a, mask))
210 continue;
211
212 return true;
213 }
214
215 return false;
216 }
217
218 static void
219 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
220 bool v6, struct device_route **res)
221 {
222 struct device_route *route;
223
224 vlist_for_each_element(&ip->route, route, node) {
225 if (!route->enabled)
226 continue;
227
228 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
229 continue;
230
231 if (!match_if_addr(&route->addr, a, route->mask))
232 continue;
233
234 if (route->flags & DEVROUTE_TABLE)
235 continue;
236
237 if (!*res || route->mask > (*res)->mask ||
238 ((route->mask == (*res)->mask) && (route->flags & DEVROUTE_METRIC)
239 && (route->metric < (*res)->metric)))
240 *res = route;
241 }
242 }
243
244 static bool
245 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
246 {
247 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
248 __find_ip_addr_target(&iface->config_ip, a, v6);
249 }
250
251 static void
252 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
253 bool v6, struct device_route **route)
254 {
255 __find_ip_route_target(&iface->proto_ip, a, v6, route);
256 __find_ip_route_target(&iface->config_ip, a, v6, route);
257 }
258
259 struct interface *
260 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface,
261 bool exclude)
262 {
263 struct device_route *route, *r_next = NULL;
264 bool defaultroute_target = false;
265 union if_addr addr_zero;
266 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
267 struct interface *exclude_iface = NULL;
268
269 if (exclude) {
270 exclude_iface = iface;
271 iface = NULL;
272 }
273
274 memset(&addr_zero, 0, sizeof(addr_zero));
275 if (memcmp(&addr_zero, addr, addrsize) == 0)
276 defaultroute_target = true;
277
278 if (iface) {
279 /* look for locally addressable target first */
280 if (interface_ip_find_addr_target(iface, addr, v6))
281 return iface;
282
283 /* do not stop at the first route, let the lookup compare
284 * masks to find the best match */
285 interface_ip_find_route_target(iface, addr, v6, &r_next);
286 } else {
287 vlist_for_each_element(&interfaces, iface, node) {
288 if (iface == exclude_iface)
289 continue;
290
291 /* look for locally addressable target first */
292 if (interface_ip_find_addr_target(iface, addr, v6))
293 return iface;
294
295 /* do not stop at the first route, let the lookup compare
296 * masks to find the best match */
297 interface_ip_find_route_target(iface, addr, v6, &r_next);
298 }
299 }
300
301 if (!r_next)
302 return NULL;
303
304 iface = r_next->iface;
305 if (defaultroute_target)
306 return iface;
307
308 route = calloc(1, sizeof(*route));
309 if (!route)
310 return NULL;
311
312 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
313 route->mask = v6 ? 128 : 32;
314 memcpy(&route->addr, addr, addrsize);
315 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
316 route->mtu = r_next->mtu;
317 route->metric = r_next->metric;
318 route->table = r_next->table;
319 route->iface = iface;
320 vlist_add(&iface->host_routes, &route->node, route);
321
322 return iface;
323 }
324
325 static void
326 interface_set_route_info(struct interface *iface, struct device_route *route)
327 {
328 bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
329
330 if (!iface)
331 return;
332
333 if (!(route->flags & DEVROUTE_METRIC))
334 route->metric = iface->metric;
335
336 if (!(route->flags & DEVROUTE_TABLE)) {
337 route->table = (v6) ? iface->ip6table : iface->ip4table;
338 if (route->table)
339 route->flags |= DEVROUTE_SRCTABLE;
340 }
341 }
342
343 void
344 interface_ip_add_neighbor(struct interface *iface, struct blob_attr *attr, bool v6)
345 {
346 struct interface_ip_settings *ip;
347 struct blob_attr *tb[__NEIGHBOR_MAX], *cur;
348 struct device_neighbor *neighbor;
349 int af = v6 ? AF_INET6: AF_INET;
350 struct ether_addr *ea;
351
352 blobmsg_parse(neighbor_attr, __NEIGHBOR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
353
354 if (!iface) {
355 if ((cur = tb[NEIGHBOR_INTERFACE]) == NULL)
356 return;
357
358 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
359
360 if (!iface)
361 return;
362
363 ip = &iface->config_ip;
364 } else
365 ip = &iface->proto_ip;
366
367 neighbor = calloc(1,sizeof(*neighbor));
368 if (!neighbor)
369 return;
370
371 neighbor->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
372
373 if ((cur = tb[NEIGHBOR_ADDRESS]) != NULL){
374 if (!inet_pton(af, blobmsg_data(cur), &neighbor->addr))
375 goto error;
376 } else
377 goto error;
378
379 if ((cur = tb[NEIGHBOR_MAC]) != NULL) {
380 neighbor->flags |= DEVNEIGH_MAC;
381 ea = ether_aton(blobmsg_data(cur));
382 if (!ea)
383 goto error;
384
385 memcpy(neighbor->macaddr, ea, 6);
386 }
387
388 if ((cur = tb[NEIGHBOR_PROXY]) != NULL)
389 neighbor->proxy = blobmsg_get_bool(cur);
390
391 if ((cur = tb[NEIGHBOR_ROUTER]) != NULL)
392 neighbor->router = blobmsg_get_bool(cur);
393
394 vlist_add(&ip->neighbor, &neighbor->node, neighbor);
395 return;
396
397 error:
398 free(neighbor);
399 }
400
401 void
402 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
403 {
404 struct interface_ip_settings *ip;
405 struct blob_attr *tb[__ROUTE_MAX], *cur;
406 struct device_route *route;
407 int af = v6 ? AF_INET6 : AF_INET;
408 bool no_device = false;
409
410 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
411
412 if ((cur = tb[ROUTE_DISABLED]) != NULL && blobmsg_get_bool(cur))
413 return;
414
415 if (!iface) {
416 if ((cur = tb[ROUTE_INTERFACE]) == NULL) {
417 iface = vlist_find(&interfaces, "loopback", iface, node);
418 no_device = true;
419 } else {
420 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
421 }
422
423 if (!iface)
424 return;
425
426 ip = &iface->config_ip;
427 } else {
428 ip = &iface->proto_ip;
429 }
430
431 route = calloc(1, sizeof(*route));
432 if (!route)
433 return;
434
435 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
436 route->mask = v6 ? 128 : 32;
437 if ((cur = tb[ROUTE_MASK]) != NULL) {
438 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
439 if (route->mask > (v6 ? 128 : 32))
440 goto error;
441 }
442
443 if ((cur = tb[ROUTE_TARGET]) != NULL) {
444 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
445 D(INTERFACE, "Failed to parse route target: %s", (char *) blobmsg_data(cur));
446 goto error;
447 }
448
449 /* Mask out IPv4 host bits to avoid "Invalid prefix for given prefix length" */
450 if (af == AF_INET && route->mask < 32)
451 clear_if_addr(&route->addr, route->mask);
452 }
453
454 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
455 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
456 D(INTERFACE, "Failed to parse route gateway: %s", (char *) blobmsg_data(cur));
457 goto error;
458 }
459 }
460
461 if ((cur = tb[ROUTE_METRIC]) != NULL) {
462 route->metric = blobmsg_get_u32(cur);
463 route->flags |= DEVROUTE_METRIC;
464 }
465
466 if ((cur = tb[ROUTE_MTU]) != NULL) {
467 route->mtu = blobmsg_get_u32(cur);
468 route->flags |= DEVROUTE_MTU;
469 }
470
471 /* Use source-based routing */
472 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
473 char *saveptr, *source = alloca(blobmsg_data_len(cur));
474 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
475
476 const char *addr = strtok_r(source, "/", &saveptr);
477 const char *mask = strtok_r(NULL, "/", &saveptr);
478
479 if (!addr || inet_pton(af, addr, &route->source) < 1) {
480 D(INTERFACE, "Failed to parse route source: %s", addr ? addr : "NULL");
481 goto error;
482 }
483
484 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
485 }
486
487 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
488 route->flags |= DEVROUTE_ONLINK;
489
490 if ((cur = tb[ROUTE_TABLE]) != NULL) {
491 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
492 D(INTERFACE, "Failed to resolve routing table: %s", (char *) blobmsg_data(cur));
493 goto error;
494 }
495
496 /* only set the table flag if not using the main (default) table */
497 if (system_is_default_rt_table(route->table))
498 route->table = 0;
499
500 if (route->table)
501 route->flags |= DEVROUTE_TABLE;
502 }
503
504 if ((cur = tb[ROUTE_VALID]) != NULL) {
505 int64_t valid = blobmsg_get_u32(cur);
506 int64_t valid_until = valid + (int64_t)system_get_rtime();
507 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) /* Catch overflow */
508 route->valid_until = valid_until;
509 }
510
511 if ((cur = tb[ROUTE_TYPE]) != NULL) {
512 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
513 D(INTERFACE, "Failed to resolve routing type: %s", (char *) blobmsg_data(cur));
514 goto error;
515 }
516 route->flags |= DEVROUTE_TYPE;
517 }
518
519 if ((cur = tb[ROUTE_PROTO]) != NULL) {
520 if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
521 D(INTERFACE, "Failed to resolve proto type: %s", (char *) blobmsg_data(cur));
522 goto error;
523 }
524 route->flags |= DEVROUTE_PROTO;
525 }
526
527 if (no_device)
528 route->flags |= DEVROUTE_NODEV;
529 else
530 interface_set_route_info(iface, route);
531
532 vlist_add(&ip->route, &route->node, route);
533 return;
534
535 error:
536 free(route);
537 }
538
539 static int
540 addr_cmp(const void *k1, const void *k2, void *ptr)
541 {
542 const struct device_addr *a1 = k1;
543 const struct device_addr *a2 = k2;
544 const int cmp_offset = offsetof(struct device_addr, flags);
545 const int cmp_size = sizeof(struct device_addr) - cmp_offset;
546
547 if (a1->index != a2->index)
548 return a1->index - a2->index;
549 return memcmp(k1+cmp_offset, k2+cmp_offset, cmp_size);
550 }
551
552 static int
553 neighbor_cmp(const void *k1, const void *k2, void *ptr)
554 {
555 const struct device_neighbor *n1 = k1, *n2 = k2;
556
557 return memcmp(&n1->addr, &n2->addr, sizeof(n2->addr));
558 }
559
560 static int
561 route_cmp(const void *k1, const void *k2, void *ptr)
562 {
563 const struct device_route *r1 = k1, *r2 = k2;
564
565 if (r1->mask != r2->mask)
566 return r2->mask - r1->mask;
567
568 if (r1->metric != r2->metric)
569 return r1->metric - r2->metric;
570
571 if (r1->flags != r2->flags)
572 return r2->flags - r1->flags;
573
574 if (r1->sourcemask != r2->sourcemask)
575 return r1->sourcemask - r2->sourcemask;
576
577 if (r1->table != r2->table)
578 return r1->table - r2->table;
579
580 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
581 if (maskcmp)
582 return maskcmp;
583
584 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
585 }
586
587 static int
588 prefix_cmp(const void *k1, const void *k2, void *ptr)
589 {
590 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
591 offsetof(struct device_prefix, addr));
592 }
593
594 static void
595 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
596 {
597 struct device *dev = iface->l3_dev.dev;
598 struct device_route *r = &addr->subnet;
599
600 if (addr->flags & DEVADDR_OFFLINK)
601 return;
602
603 if (!add) {
604 if (!addr->subnet.iface)
605 return;
606
607 system_del_route(dev, r);
608 memset(r, 0, sizeof(*r));
609 return;
610 }
611
612 r->iface = iface;
613 r->flags = addr->flags;
614 r->mask = addr->mask;
615 memcpy(&r->addr, &addr->addr, sizeof(r->addr));
616 clear_if_addr(&r->addr, r->mask);
617
618 if (!system_resolve_rt_proto("kernel", &r->proto))
619 return;
620
621 r->flags |= DEVROUTE_PROTO;
622 system_del_route(dev, r);
623
624 r->flags &= ~DEVROUTE_PROTO;
625 interface_set_route_info(iface, r);
626
627 system_add_route(dev, r);
628 }
629
630 static void
631 interface_add_addr_rules(struct device_addr *addr, bool enabled)
632 {
633 bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
634
635 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
636 (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
637 true);
638 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
639 &addr->addr, addr->mask, addr->policy_table, NULL,
640 NULL, false);
641 }
642
643 static void
644 interface_update_proto_addr(struct vlist_tree *tree,
645 struct vlist_node *node_new,
646 struct vlist_node *node_old)
647 {
648 struct interface_ip_settings *ip;
649 struct interface *iface;
650 struct device *dev;
651 struct device_addr *a_new = NULL, *a_old = NULL;
652 bool replace = false;
653 bool keep = false;
654 bool v6 = false;
655
656 ip = container_of(tree, struct interface_ip_settings, addr);
657 iface = ip->iface;
658 dev = iface->l3_dev.dev;
659
660 if (!node_new || !node_old)
661 iface->updated |= IUF_ADDRESS;
662
663 if (node_new) {
664 a_new = container_of(node_new, struct device_addr, node);
665
666 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
667 !a_new->broadcast) {
668
669 /* /31 and /32 addressing need 255.255.255.255
670 * as broadcast address. */
671 if (a_new->mask >= 31) {
672 a_new->broadcast = (uint32_t) ~0;
673 } else {
674 uint32_t mask = ~0;
675 uint32_t *a = (uint32_t *) &a_new->addr;
676
677 mask >>= a_new->mask;
678 a_new->broadcast = *a | htonl(mask);
679 }
680 }
681 }
682
683 if (node_old)
684 a_old = container_of(node_old, struct device_addr, node);
685
686 if (a_new && a_old) {
687 keep = true;
688
689 if (a_old->flags != a_new->flags || a_old->failed)
690 keep = false;
691
692 if (a_old->valid_until != a_new->valid_until ||
693 a_old->preferred_until != a_new->preferred_until)
694 replace = true;
695
696 if (((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
697 (a_new->broadcast != a_old->broadcast ||
698 a_new->point_to_point != a_old->point_to_point))
699 keep = false;
700 }
701
702 if (node_old) {
703 if (a_old->enabled && !keep) {
704 /*
705 * This is needed for source routing to work correctly. If a device
706 * has two connections to a network using the same subnet, adding
707 * only the network-rule will cause packets to be routed through the
708 * first matching network (source IP matches both masks)
709 */
710 if (a_old->policy_table)
711 interface_add_addr_rules(a_old, false);
712
713 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
714 interface_handle_subnet_route(iface, a_old, false);
715 system_del_address(dev, a_old);
716
717 if ((a_old->flags & DEVADDR_OFFLINK) && (a_old->mask < (v6 ? 128 : 32))) {
718 struct device_route route;
719
720 memset(&route, 0, sizeof(route));
721 route.flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
722 route.metric = INT32_MAX;
723 route.mask = a_old->mask;
724 route.addr = a_old->addr;
725
726 clear_if_addr(&route.addr, route.mask);
727
728 /* Delete null-route */
729 system_del_route(NULL, &route);
730 }
731
732 }
733 }
734 free(a_old->pclass);
735 free(a_old);
736 }
737
738 if (node_new) {
739 a_new->enabled = true;
740
741 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
742 v6 = true;
743
744 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
745
746 if (!keep || replace) {
747 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
748 if (system_add_address(dev, a_new))
749 a_new->failed = true;
750
751 if (iface->metric || a_new->policy_table)
752 interface_handle_subnet_route(iface, a_new, true);
753 }
754
755 if (!keep) {
756 if (!(a_new->flags & DEVADDR_EXTERNAL) &&
757 (a_new->flags & DEVADDR_OFFLINK) &&
758 (a_new->mask < (v6 ? 128 : 32))) {
759 struct device_route route;
760
761 memset(&route, 0, sizeof(route));
762 route.flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
763 route.metric = INT32_MAX;
764 route.mask = a_new->mask;
765 route.addr = a_new->addr;
766
767 clear_if_addr(&route.addr, route.mask);
768
769 /*
770 * In case off link is specifed as address property
771 * add null-route to avoid routing loops
772 */
773 system_add_route(NULL, &route);
774 }
775
776 if (a_new->policy_table)
777 interface_add_addr_rules(a_new, true);
778 }
779 }
780 }
781 }
782
783 static bool
784 enable_route(struct interface_ip_settings *ip, struct device_route *route)
785 {
786 if (ip->no_defaultroute && !route->mask)
787 return false;
788
789 return ip->enabled;
790 }
791
792 static void
793 interface_update_proto_neighbor(struct vlist_tree *tree,
794 struct vlist_node * node_new,
795 struct vlist_node *node_old)
796 {
797 struct device *dev;
798 struct device_neighbor *neighbor_old, *neighbor_new;
799 struct interface_ip_settings *ip;
800 bool keep = false;
801
802 ip = container_of(tree, struct interface_ip_settings, neighbor);
803 dev = ip->iface->l3_dev.dev;
804
805 neighbor_old = container_of(node_old, struct device_neighbor, node);
806 neighbor_new = container_of(node_new, struct device_neighbor, node);
807
808 if (node_old && node_new) {
809 keep = (!memcmp(neighbor_old->macaddr, neighbor_new->macaddr, sizeof(neighbor_old->macaddr)) &&
810 (neighbor_old->proxy == neighbor_new->proxy) &&
811 (neighbor_old->router == neighbor_new->router));
812 }
813
814 if (node_old) {
815 if (!keep && neighbor_old->enabled)
816 system_del_neighbor(dev, neighbor_old);
817
818 free(neighbor_old);
819 }
820
821 if (node_new) {
822 if (!keep && ip->enabled)
823 if (system_add_neighbor(dev, neighbor_new))
824 neighbor_new->failed = true;
825
826 neighbor_new->enabled = ip->enabled;
827 }
828 }
829
830 static void
831 __interface_update_route(struct interface_ip_settings *ip,
832 struct vlist_node *node_new,
833 struct vlist_node *node_old)
834 {
835 struct interface *iface = ip->iface;
836 struct device *dev;
837 struct device_route *route_old, *route_new;
838 bool keep = false;
839
840 dev = iface->l3_dev.dev;
841
842 if (!node_new || !node_old)
843 iface->updated |= IUF_ROUTE;
844
845 route_old = container_of(node_old, struct device_route, node);
846 route_new = container_of(node_new, struct device_route, node);
847
848 if (node_old && node_new)
849 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
850 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
851 (route_old->proto == route_new->proto) && !route_old->failed;
852
853 if (node_old) {
854 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
855 system_del_route(dev, route_old);
856
857 free(route_old);
858 }
859
860 if (node_new) {
861 bool _enabled = enable_route(ip, route_new);
862
863 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
864 if (system_add_route(dev, route_new))
865 route_new->failed = true;
866
867 route_new->iface = iface;
868 route_new->enabled = _enabled;
869 }
870 }
871
872 static void
873 interface_update_proto_route(struct vlist_tree *tree,
874 struct vlist_node *node_new,
875 struct vlist_node *node_old)
876 {
877 struct interface_ip_settings *ip;
878
879 ip = container_of(tree, struct interface_ip_settings, route);
880 __interface_update_route(ip, node_new, node_old);
881 }
882
883 static void
884 interface_update_host_route(struct vlist_tree *tree,
885 struct vlist_node *node_new,
886 struct vlist_node *node_old)
887 {
888 struct interface *iface;
889
890 iface = container_of(tree, struct interface, host_routes);
891 __interface_update_route(&iface->proto_ip, node_new, node_old);
892 }
893
894 static void
895 random_ifaceid(struct in6_addr *addr)
896 {
897 static bool initialized = false;
898 struct timeval t;
899
900 if (!initialized) {
901 long int seed = 0;
902 gettimeofday(&t, NULL);
903 seed = t.tv_sec ^ t.tv_usec ^ getpid();
904 srand48(seed);
905 initialized = true;
906 }
907 addr->s6_addr32[2] = (uint32_t)mrand48();
908 addr->s6_addr32[3] = (uint32_t)mrand48();
909 }
910
911 static bool
912 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
913 {
914 struct device_settings st;
915
916 device_merge_settings(iface->l3_dev.dev, &st);
917
918 if (!(st.flags & DEV_OPT_MACADDR))
919 return false;
920
921 /* get mac address */
922 uint8_t *ifaceid = addr->s6_addr + 8;
923 memcpy(ifaceid, st.macaddr, 3);
924 memcpy(ifaceid + 5, st.macaddr + 3, 3);
925 ifaceid[3] = 0xff;
926 ifaceid[4] = 0xfe;
927 ifaceid[0] ^= 0x02;
928
929 return true;
930 }
931
932 static bool
933 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
934 {
935 bool ret = true;
936
937 /* generate new iface id */
938 switch (iface->assignment_iface_id_selection) {
939 case IFID_FIXED:
940 /* fixed */
941 /* copy host part from assignment_fixed_iface_id */
942 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
943 break;
944 case IFID_RANDOM:
945 /* randomize last 64 bits */
946 random_ifaceid(addr);
947 break;
948 case IFID_EUI64:
949 /* eui64 */
950 ret = eui64_ifaceid(iface, addr);
951 break;
952 default:
953 ret = false;
954 break;
955 }
956 return ret;
957 }
958
959 static void
960 interface_set_prefix_address(struct device_prefix_assignment *assignment,
961 const struct device_prefix *prefix, struct interface *iface, bool add)
962 {
963 const struct interface *uplink = prefix->iface;
964 if (!iface->l3_dev.dev)
965 return;
966
967 struct device *l3_downlink = iface->l3_dev.dev;
968
969 struct device_addr addr;
970 struct device_route route;
971 memset(&addr, 0, sizeof(addr));
972 memset(&route, 0, sizeof(route));
973
974 addr.addr.in6 = assignment->addr;
975 addr.mask = assignment->length;
976 addr.flags = DEVADDR_INET6;
977 addr.preferred_until = prefix->preferred_until;
978 addr.valid_until = prefix->valid_until;
979
980 route.flags = DEVADDR_INET6;
981 route.mask = addr.mask < 64 ? 64 : addr.mask;
982 route.addr = addr.addr;
983
984 if (!add && assignment->enabled) {
985 time_t now = system_get_rtime();
986
987 if (addr.valid_until && addr.valid_until - 1 <= now) {
988 addr.valid_until = 0;
989 addr.preferred_until = 0;
990 } else {
991 /* Address is still valid; pass its ownership to kernel (see L-14 RFC 7084). */
992 addr.preferred_until = now;
993
994 if (!addr.valid_until || addr.valid_until > now + 7200)
995 addr.valid_until = now + 7200;
996 }
997
998 if (iface->ip6table)
999 set_ip_source_policy(false, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
1000 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
1001
1002 if (prefix->iface) {
1003 if (prefix->iface->ip6table)
1004 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
1005 addr.mask, prefix->iface->ip6table, iface, NULL, true);
1006
1007 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
1008 addr.mask, 0, iface, "unreachable", true);
1009 }
1010
1011 clear_if_addr(&route.addr, route.mask);
1012 interface_set_route_info(iface, &route);
1013
1014 system_del_route(l3_downlink, &route);
1015 if (addr.valid_until)
1016 system_add_address(l3_downlink, &addr);
1017 else
1018 system_del_address(l3_downlink, &addr);
1019
1020 assignment->addr = in6addr_any;
1021 assignment->enabled = false;
1022 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
1023 if (IN6_IS_ADDR_UNSPECIFIED(&addr.addr.in6)) {
1024 addr.addr.in6 = prefix->addr;
1025 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
1026 if (!generate_ifaceid(iface, &addr.addr.in6))
1027 return;
1028
1029 assignment->addr = addr.addr.in6;
1030 route.addr = addr.addr;
1031 }
1032
1033 addr.flags |= DEVADDR_OFFLINK;
1034 if (system_add_address(l3_downlink, &addr))
1035 return;
1036
1037 if (!assignment->enabled) {
1038 if (iface->ip6table)
1039 set_ip_source_policy(true, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
1040 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
1041
1042 if (prefix->iface) {
1043 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
1044 addr.mask, 0, iface, "unreachable", true);
1045
1046 if (prefix->iface->ip6table)
1047 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
1048 addr.mask, prefix->iface->ip6table, iface, NULL, true);
1049 }
1050 }
1051
1052 clear_if_addr(&route.addr, route.mask);
1053 interface_set_route_info(iface, &route);
1054
1055 system_add_route(l3_downlink, &route);
1056
1057 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
1058 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
1059 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
1060
1061 if (mtu > 0 && mtu_old != mtu) {
1062 if (system_update_ipv6_mtu(l3_downlink, mtu) < 0 && mtu < mtu_old)
1063 netifd_log_message(L_WARNING, "Failed to set IPv6 mtu to %d "
1064 "on interface '%s'\n", mtu, iface->name);
1065 }
1066 }
1067
1068 assignment->enabled = true;
1069 }
1070 }
1071
1072 static bool interface_prefix_assign(struct list_head *list,
1073 struct device_prefix_assignment *assign)
1074 {
1075 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
1076 struct device_prefix_assignment *c;
1077 list_for_each_entry(c, list, head) {
1078 if (assign->assigned != -1) {
1079 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
1080 list_add_tail(&assign->head, &c->head);
1081 return true;
1082 }
1083 } else if (assign->assigned == -1) {
1084 current = (current + asize) & (~asize);
1085 if (current + asize < c->assigned) {
1086 assign->assigned = current;
1087 list_add_tail(&assign->head, &c->head);
1088 return true;
1089 }
1090 }
1091 current = (c->assigned + (1 << (64 - c->length)));
1092 }
1093 return false;
1094 }
1095
1096 /*
1097 * Sorting of assignment entries:
1098 * Primary on assignment length: smallest assignment first
1099 * Secondary on assignment weight: highest weight first
1100 * Finally alphabetical order of interface names
1101 */
1102 static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
1103 {
1104 const struct device_prefix_assignment *a1 = k1, *a2 = k2;
1105
1106 if (a1->length != a2->length)
1107 return a1->length - a2->length;
1108
1109 if (a1->weight != a2->weight)
1110 return a2->weight - a1->weight;
1111
1112 return strcmp(a1->name, a2->name);
1113 }
1114
1115 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
1116 {
1117 struct device_prefix_assignment *c;
1118 struct interface *iface;
1119
1120 /* Delete all assignments */
1121 while (!list_empty(&prefix->assignments)) {
1122 c = list_first_entry(&prefix->assignments,
1123 struct device_prefix_assignment, head);
1124 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1125 interface_set_prefix_address(c, prefix, iface, false);
1126 list_del(&c->head);
1127 free(c);
1128 }
1129
1130 if (!setup)
1131 return;
1132
1133 /* End-of-assignment sentinel */
1134 c = malloc(sizeof(*c) + 1);
1135 if (!c)
1136 return;
1137
1138 c->assigned = 1 << (64 - prefix->length);
1139 c->length = 64;
1140 c->name[0] = 0;
1141 c->addr = in6addr_any;
1142 list_add(&c->head, &prefix->assignments);
1143
1144 /* Excluded prefix */
1145 if (prefix->excl_length > 0) {
1146 const char name[] = "!excluded";
1147 c = malloc(sizeof(*c) + sizeof(name));
1148 if (c) {
1149 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
1150 ((1 << (64 - prefix->length)) - 1);
1151 c->length = prefix->excl_length;
1152 c->addr = in6addr_any;
1153 memcpy(c->name, name, sizeof(name));
1154 list_add(&c->head, &prefix->assignments);
1155 }
1156 }
1157
1158 bool assigned_any = false;
1159 struct {
1160 struct avl_node node;
1161 } *entry, *n_entry;
1162 struct avl_tree assign_later;
1163
1164 avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
1165
1166 vlist_for_each_element(&interfaces, iface, node) {
1167 if (iface->assignment_length < 48 ||
1168 iface->assignment_length > 64)
1169 continue;
1170
1171 /* Test whether there is a matching class */
1172 if (!list_empty(&iface->assignment_classes)) {
1173 bool found = false;
1174
1175 struct interface_assignment_class *c;
1176 list_for_each_entry(c, &iface->assignment_classes, head) {
1177 if (!strcmp(c->name, prefix->pclass)) {
1178 found = true;
1179 break;
1180 }
1181 }
1182
1183 if (!found)
1184 continue;
1185 }
1186
1187 size_t namelen = strlen(iface->name) + 1;
1188 c = malloc(sizeof(*c) + namelen);
1189 if (!c)
1190 continue;
1191
1192 c->length = iface->assignment_length;
1193 c->assigned = iface->assignment_hint;
1194 c->weight = iface->assignment_weight;
1195 c->addr = in6addr_any;
1196 c->enabled = false;
1197 memcpy(c->name, iface->name, namelen);
1198
1199 /* First process all custom assignments, put all others in later-list */
1200 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
1201 if (c->assigned != -1) {
1202 c->assigned = -1;
1203 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
1204 "of size %hhu for %s, trying other\n", c->length, c->name);
1205 }
1206
1207 entry = calloc(1, sizeof(*entry));
1208 if (!entry) {
1209 free(c);
1210 continue;
1211 }
1212
1213 entry->node.key = c;
1214 avl_insert(&assign_later, &entry->node);
1215 }
1216
1217 if (c->assigned != -1)
1218 assigned_any = true;
1219 }
1220
1221 /* Then try to assign all other + failed custom assignments */
1222 avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
1223 bool assigned = false;
1224
1225 c = (struct device_prefix_assignment *)entry->node.key;
1226 avl_delete(&assign_later, &entry->node);
1227
1228 do {
1229 assigned = interface_prefix_assign(&prefix->assignments, c);
1230 } while (!assigned && ++c->length <= 64);
1231
1232 if (!assigned) {
1233 netifd_log_message(L_WARNING, "Failed to assign subprefix "
1234 "of size %hhu for %s\n", c->length, c->name);
1235 free(c);
1236 } else
1237 assigned_any = true;
1238
1239 free(entry);
1240 }
1241
1242 list_for_each_entry(c, &prefix->assignments, head)
1243 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1244 interface_set_prefix_address(c, prefix, iface, true);
1245
1246 if (!assigned_any)
1247 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
1248 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
1249 }
1250
1251
1252 void interface_refresh_assignments(bool hint)
1253 {
1254 static bool refresh = false;
1255 if (!hint && refresh) {
1256 struct device_prefix *p;
1257 time_t now = system_get_rtime();
1258
1259 list_for_each_entry(p, &prefixes, head) {
1260 bool valid = !(p->valid_until && p->valid_until - 1 <= now);
1261
1262 interface_update_prefix_assignments(p, valid);
1263 }
1264 }
1265 refresh = hint;
1266 }
1267
1268 void interface_update_prefix_delegation(struct interface_ip_settings *ip)
1269 {
1270 struct device_prefix *prefix;
1271 time_t now = system_get_rtime();
1272
1273 vlist_for_each_element(&ip->prefix, prefix, node) {
1274 bool valid = !(prefix->valid_until && prefix->valid_until - 1 <= now);
1275
1276 interface_update_prefix_assignments(prefix, !ip->no_delegation && valid);
1277
1278 if (ip->no_delegation) {
1279 if (prefix->head.next)
1280 list_del(&prefix->head);
1281 } else
1282 list_add(&prefix->head, &prefixes);
1283 }
1284 }
1285
1286 static void
1287 interface_update_prefix(struct vlist_tree *tree,
1288 struct vlist_node *node_new,
1289 struct vlist_node *node_old)
1290 {
1291 struct device_prefix *prefix_old, *prefix_new;
1292 prefix_old = container_of(node_old, struct device_prefix, node);
1293 prefix_new = container_of(node_new, struct device_prefix, node);
1294
1295 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
1296 if (tree && (!node_new || !node_old))
1297 ip->iface->updated |= IUF_PREFIX;
1298
1299 struct device_route route;
1300 memset(&route, 0, sizeof(route));
1301 route.flags = DEVADDR_INET6;
1302 route.metric = INT32_MAX;
1303 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
1304 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
1305
1306 struct device_prefix_assignment *c;
1307 struct interface *iface;
1308 bool new_valid = node_new && !(prefix_new->valid_until && prefix_new->valid_until - 1 <= system_get_rtime());
1309
1310 if (node_old && node_new) {
1311 /* Move assignments and refresh addresses to update valid times */
1312 list_splice(&prefix_old->assignments, &prefix_new->assignments);
1313
1314 list_for_each_entry(c, &prefix_new->assignments, head)
1315 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1316 interface_set_prefix_address(c, prefix_new, iface, new_valid);
1317
1318 if (prefix_new->preferred_until != prefix_old->preferred_until ||
1319 prefix_new->valid_until != prefix_old->valid_until)
1320 ip->iface->updated |= IUF_PREFIX;
1321 } else if (node_new) {
1322 /* Set null-route to avoid routing loops */
1323 system_add_route(NULL, &route);
1324
1325 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
1326 interface_update_prefix_assignments(prefix_new, new_valid);
1327 } else if (node_old) {
1328 /* Remove null-route */
1329 interface_update_prefix_assignments(prefix_old, false);
1330 system_del_route(NULL, &route);
1331 }
1332
1333 if (node_old) {
1334 if (prefix_old->head.next)
1335 list_del(&prefix_old->head);
1336 free(prefix_old);
1337 }
1338
1339 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1340 list_add(&prefix_new->head, &prefixes);
1341
1342 }
1343
1344 struct device_prefix*
1345 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1346 uint8_t length, time_t valid_until, time_t preferred_until,
1347 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1348 {
1349 union if_addr a = { .in6 = *addr };
1350
1351 if (!pclass)
1352 pclass = (iface) ? iface->name : "local";
1353
1354 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1355 if (!prefix)
1356 return NULL;
1357
1358 clear_if_addr(&a, length);
1359
1360 prefix->length = length;
1361 prefix->addr = a.in6;
1362 prefix->preferred_until = preferred_until;
1363 prefix->valid_until = valid_until;
1364 prefix->iface = iface;
1365 INIT_LIST_HEAD(&prefix->assignments);
1366
1367 if (excl_addr) {
1368 prefix->excl_addr = *excl_addr;
1369 prefix->excl_length = excl_length;
1370 }
1371
1372 strcpy(prefix->pclass, pclass);
1373
1374 if (iface)
1375 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1376 else
1377 interface_update_prefix(NULL, &prefix->node, NULL);
1378
1379 return prefix;
1380 }
1381
1382 void
1383 interface_ip_set_ula_prefix(const char *prefix)
1384 {
1385 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1386 if (prefix)
1387 strncpy(buf, prefix, sizeof(buf) - 1);
1388 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1389
1390 struct in6_addr addr;
1391 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1392 if (ula_prefix) {
1393 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1394 ula_prefix = NULL;
1395 }
1396 return;
1397 }
1398
1399 int length;
1400 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1401 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1402 return;
1403
1404 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1405 ula_prefix->length != length) {
1406 if (ula_prefix)
1407 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1408
1409 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1410 0, 0, NULL, 0, NULL);
1411 }
1412 }
1413
1414 static void
1415 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1416 {
1417 struct dns_server *s;
1418
1419 s = calloc(1, sizeof(*s));
1420 if (!s)
1421 return;
1422
1423 s->af = AF_INET;
1424 if (inet_pton(s->af, str, &s->addr.in))
1425 goto add;
1426
1427 s->af = AF_INET6;
1428 if (inet_pton(s->af, str, &s->addr.in))
1429 goto add;
1430
1431 free(s);
1432 return;
1433
1434 add:
1435 D(INTERFACE, "Add IPv%c DNS server: %s",
1436 s->af == AF_INET6 ? '6' : '4', str);
1437 vlist_simple_add(&ip->dns_servers, &s->node);
1438 }
1439
1440 void
1441 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1442 {
1443 struct blob_attr *cur;
1444 size_t rem;
1445
1446 blobmsg_for_each_attr(cur, list, rem) {
1447 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1448 continue;
1449
1450 if (!blobmsg_check_attr(cur, false))
1451 continue;
1452
1453 interface_add_dns_server(ip, blobmsg_data(cur));
1454 }
1455 }
1456
1457 static void
1458 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1459 {
1460 struct dns_search_domain *s;
1461 int len = strlen(str);
1462
1463 s = calloc(1, sizeof(*s) + len + 1);
1464 if (!s)
1465 return;
1466
1467 D(INTERFACE, "Add DNS search domain: %s", str);
1468 memcpy(s->name, str, len);
1469 vlist_simple_add(&ip->dns_search, &s->node);
1470 }
1471
1472 void
1473 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1474 {
1475 struct blob_attr *cur;
1476 size_t rem;
1477
1478 blobmsg_for_each_attr(cur, list, rem) {
1479 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1480 continue;
1481
1482 if (!blobmsg_check_attr(cur, false))
1483 continue;
1484
1485 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1486 }
1487 }
1488
1489 static void
1490 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1491 {
1492 struct dns_server *s;
1493 struct dns_search_domain *d;
1494 const char *str;
1495 char buf[INET6_ADDRSTRLEN];
1496
1497 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1498 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1499 if (!str)
1500 continue;
1501
1502 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1503 fprintf(f, "nameserver %s%%%s\n", str, dev);
1504 else
1505 fprintf(f, "nameserver %s\n", str);
1506 }
1507
1508 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1509 fprintf(f, "search %s\n", d->name);
1510 }
1511 }
1512
1513 /* Sorting of interface resolver entries : */
1514 /* Primary on interface dns_metric : lowest metric first */
1515 /* Secondary on interface metric : lowest metric first */
1516 /* Finally alphabetical order of interface names */
1517 static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
1518 {
1519 const struct interface *iface1 = k1, *iface2 = k2;
1520
1521 if (iface1->dns_metric != iface2->dns_metric)
1522 return iface1->dns_metric - iface2->dns_metric;
1523
1524 if (iface1->metric != iface2->metric)
1525 return iface1->metric - iface2->metric;
1526
1527 return strcmp(iface1->name, iface2->name);
1528 }
1529
1530 static void
1531 __interface_write_dns_entries(FILE *f, const char *jail)
1532 {
1533 struct interface *iface;
1534 struct {
1535 struct avl_node node;
1536 } *entry, *n_entry;
1537 struct avl_tree resolv_conf_iface_entries;
1538
1539 avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
1540
1541 vlist_for_each_element(&interfaces, iface, node) {
1542 if (iface->state != IFS_UP)
1543 continue;
1544
1545 if (jail && (!iface->jail || strcmp(jail, iface->jail)))
1546 continue;
1547
1548 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1549 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1550 vlist_simple_empty(&iface->config_ip.dns_search) &&
1551 vlist_simple_empty(&iface->config_ip.dns_servers))
1552 continue;
1553
1554 entry = calloc(1, sizeof(*entry));
1555 if (!entry)
1556 continue;
1557
1558 entry->node.key = iface;
1559 avl_insert(&resolv_conf_iface_entries, &entry->node);
1560 }
1561
1562 avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
1563 iface = (struct interface *)entry->node.key;
1564 struct device *dev = iface->l3_dev.dev;
1565
1566 fprintf(f, "# Interface %s\n", iface->name);
1567
1568 write_resolv_conf_entries(f, &iface->config_ip, dev->ifname);
1569
1570 if (!iface->proto_ip.no_dns)
1571 write_resolv_conf_entries(f, &iface->proto_ip, dev->ifname);
1572 }
1573
1574 avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
1575 free(entry);
1576 }
1577
1578 void
1579 interface_write_resolv_conf(const char *jail)
1580 {
1581 size_t plen = (jail ? strlen(jail) + 1 : 0 ) +
1582 (strlen(resolv_conf) >= strlen(DEFAULT_RESOLV_CONF) ?
1583 strlen(resolv_conf) : strlen(DEFAULT_RESOLV_CONF) ) + 1;
1584 char *path = alloca(plen);
1585 char *dpath = alloca(plen);
1586 char *tmppath = alloca(plen + 4);
1587 FILE *f;
1588 uint32_t crcold, crcnew;
1589
1590 if (jail) {
1591 sprintf(path, "/tmp/resolv.conf-%s.d/resolv.conf.auto", jail);
1592 strcpy(dpath, path);
1593 dpath = dirname(dpath);
1594 mkdir(dpath, 0755);
1595 } else {
1596 strcpy(path, resolv_conf);
1597 }
1598
1599 sprintf(tmppath, "%s.tmp", path);
1600 unlink(tmppath);
1601 f = fopen(tmppath, "w+");
1602 if (!f) {
1603 D(INTERFACE, "Failed to open %s for writing", path);
1604 return;
1605 }
1606
1607 __interface_write_dns_entries(f, jail);
1608
1609 fflush(f);
1610 rewind(f);
1611 crcnew = crc32_file(f);
1612 fclose(f);
1613
1614 crcold = crcnew + 1;
1615 f = fopen(path, "r");
1616 if (f) {
1617 crcold = crc32_file(f);
1618 fclose(f);
1619 }
1620
1621 if (crcold == crcnew) {
1622 unlink(tmppath);
1623 } else if (rename(tmppath, path) < 0) {
1624 D(INTERFACE, "Failed to replace %s", path);
1625 unlink(tmppath);
1626 }
1627 }
1628
1629 static void
1630 interface_ip_set_route_enabled(struct interface_ip_settings *ip,
1631 struct device_route *route, bool enabled)
1632 {
1633 struct device *dev = ip->iface->l3_dev.dev;
1634
1635 if (route->flags & DEVADDR_EXTERNAL)
1636 return;
1637
1638 if (!enable_route(ip, route))
1639 enabled = false;
1640
1641 if (route->enabled == enabled)
1642 return;
1643
1644 if (enabled) {
1645 interface_set_route_info(ip->iface, route);
1646
1647 if (system_add_route(dev, route))
1648 route->failed = true;
1649 } else
1650 system_del_route(dev, route);
1651
1652 route->enabled = enabled;
1653 }
1654
1655 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1656 {
1657 struct device_addr *addr;
1658 struct device_route *route;
1659 struct device_neighbor *neighbor;
1660 struct device *dev;
1661 struct interface *iface;
1662
1663 ip->enabled = enabled;
1664 iface = ip->iface;
1665 dev = iface->l3_dev.dev;
1666 if (!dev)
1667 return;
1668
1669 vlist_for_each_element(&ip->addr, addr, node) {
1670 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1671
1672 if (addr->flags & DEVADDR_EXTERNAL)
1673 continue;
1674
1675 if (addr->enabled == enabled)
1676 continue;
1677
1678 if (enabled) {
1679 system_add_address(dev, addr);
1680
1681 addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1682 if (iface->metric || addr->policy_table)
1683 interface_handle_subnet_route(iface, addr, true);
1684
1685 if ((addr->flags & DEVADDR_OFFLINK) && (addr->mask < (v6 ? 128 : 32))) {
1686 struct device_route route;
1687
1688 memset(&route, 0, sizeof(route));
1689 route.flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
1690 route.metric = INT32_MAX;
1691 route.mask = addr->mask;
1692 route.addr = addr->addr;
1693
1694 clear_if_addr(&route.addr, route.mask);
1695
1696 /*
1697 * In case off link is specifed as address property
1698 * add null-route to avoid routing loops
1699 */
1700 system_add_route(NULL, &route);
1701 }
1702
1703 if (addr->policy_table)
1704 interface_add_addr_rules(addr, true);
1705 } else {
1706 interface_handle_subnet_route(iface, addr, false);
1707 system_del_address(dev, addr);
1708
1709 if ((addr->flags & DEVADDR_OFFLINK) && (addr->mask < (v6 ? 128 : 32))) {
1710 struct device_route route;
1711
1712 memset(&route, 0, sizeof(route));
1713 route.flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
1714 route.metric = INT32_MAX;
1715 route.mask = addr->mask;
1716 route.addr = addr->addr;
1717
1718 clear_if_addr(&route.addr, route.mask);
1719
1720 /* Delete null-route */
1721 system_del_route(NULL, &route);
1722 }
1723
1724 if (addr->policy_table)
1725 interface_add_addr_rules(addr, false);
1726 }
1727 addr->enabled = enabled;
1728 }
1729
1730 vlist_for_each_element(&ip->route, route, node)
1731 interface_ip_set_route_enabled(ip, route, enabled);
1732 if (ip == &iface->proto_ip)
1733 vlist_for_each_element(&iface->host_routes, route, node)
1734 interface_ip_set_route_enabled(ip, route, enabled);
1735
1736 vlist_for_each_element(&ip->neighbor, neighbor, node) {
1737 if (neighbor->enabled == enabled)
1738 continue;
1739
1740 if (enabled) {
1741 if(system_add_neighbor(dev, neighbor))
1742 neighbor->failed = true;
1743 } else
1744 system_del_neighbor(dev, neighbor);
1745
1746 neighbor->enabled = enabled;
1747 }
1748
1749 struct device_prefix *c;
1750 struct device_prefix_assignment *a;
1751 list_for_each_entry(c, &prefixes, head)
1752 list_for_each_entry(a, &c->assignments, head)
1753 if (!strcmp(a->name, ip->iface->name))
1754 interface_set_prefix_address(a, c, ip->iface, enabled);
1755
1756 if (ip->iface->policy_rules_set != enabled &&
1757 ip->iface->l3_dev.dev) {
1758 if (ip->iface->l3_dev.dev->settings.ipv6) {
1759 set_ip_lo_policy(enabled, true, ip->iface);
1760 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1761 NULL, 0, 0, ip->iface, "failed_policy", true);
1762 }
1763 set_ip_lo_policy(enabled, false, ip->iface);
1764
1765 ip->iface->policy_rules_set = enabled;
1766 }
1767 }
1768
1769 void
1770 interface_ip_update_start(struct interface_ip_settings *ip)
1771 {
1772 if (ip != &ip->iface->config_ip) {
1773 vlist_simple_update(&ip->dns_servers);
1774 vlist_simple_update(&ip->dns_search);
1775 }
1776 vlist_update(&ip->route);
1777 vlist_update(&ip->addr);
1778 vlist_update(&ip->prefix);
1779 vlist_update(&ip->neighbor);
1780 }
1781
1782 void
1783 interface_ip_update_complete(struct interface_ip_settings *ip)
1784 {
1785 vlist_simple_flush(&ip->dns_servers);
1786 vlist_simple_flush(&ip->dns_search);
1787 vlist_flush(&ip->route);
1788 vlist_flush(&ip->addr);
1789 vlist_flush(&ip->prefix);
1790 vlist_flush(&ip->neighbor);
1791 interface_write_resolv_conf(ip->iface->jail);
1792 }
1793
1794 void
1795 interface_ip_flush(struct interface_ip_settings *ip)
1796 {
1797 if (ip == &ip->iface->proto_ip)
1798 vlist_flush_all(&ip->iface->host_routes);
1799 vlist_simple_flush_all(&ip->dns_servers);
1800 vlist_simple_flush_all(&ip->dns_search);
1801 vlist_flush_all(&ip->route);
1802 vlist_flush_all(&ip->addr);
1803 vlist_flush_all(&ip->neighbor);
1804 vlist_flush_all(&ip->prefix);
1805 }
1806
1807 static void
1808 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1809 {
1810 ip->iface = iface;
1811 ip->enabled = true;
1812 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1813 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1814 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1815 vlist_init(&ip->neighbor, neighbor_cmp, interface_update_proto_neighbor);
1816 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1817 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1818 }
1819
1820 void
1821 interface_ip_init(struct interface *iface)
1822 {
1823 __interface_ip_init(&iface->proto_ip, iface);
1824 __interface_ip_init(&iface->config_ip, iface);
1825 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1826 }
1827
1828 static void
1829 interface_ip_valid_until_handler(struct uloop_timeout *t)
1830 {
1831 time_t now = system_get_rtime();
1832 struct interface *iface;
1833 vlist_for_each_element(&interfaces, iface, node) {
1834 if (iface->state != IFS_UP)
1835 continue;
1836
1837 struct device_addr *addr, *addrp;
1838 struct device_route *route, *routep;
1839 struct device_prefix *pref, *prefp;
1840
1841 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1842 if (addr->valid_until && addr->valid_until < now)
1843 vlist_delete(&iface->proto_ip.addr, &addr->node);
1844
1845 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1846 if (route->valid_until && route->valid_until < now)
1847 vlist_delete(&iface->proto_ip.route, &route->node);
1848
1849 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1850 if (pref->valid_until && pref->valid_until < now)
1851 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1852
1853 }
1854
1855 uloop_timeout_set(t, 1000);
1856 }
1857
1858 static void __init
1859 interface_ip_init_worker(void)
1860 {
1861 valid_until_timeout.cb = interface_ip_valid_until_handler;
1862 uloop_timeout_set(&valid_until_timeout, 1000);
1863 }
OpenWrt Network interface configuration daemon