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interface-ip: Remove ip loop policy rules as kernel issue is fixed
[project/netifd.git] / interface-ip.c
1 /*
2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2012 Steven Barth <steven@midlink.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15 #include <string.h>
16 #include <stdlib.h>
17 #include <stdio.h>
18
19 #include <limits.h>
20 #include <arpa/inet.h>
21 #include <netinet/in.h>
22
23 #include "netifd.h"
24 #include "device.h"
25 #include "interface.h"
26 #include "interface-ip.h"
27 #include "proto.h"
28 #include "ubus.h"
29 #include "system.h"
30
31 enum {
32 ROUTE_INTERFACE,
33 ROUTE_TARGET,
34 ROUTE_MASK,
35 ROUTE_GATEWAY,
36 ROUTE_METRIC,
37 ROUTE_MTU,
38 ROUTE_VALID,
39 ROUTE_TABLE,
40 ROUTE_SOURCE,
41 ROUTE_ONLINK,
42 ROUTE_TYPE,
43 __ROUTE_MAX
44 };
45
46 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
47 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
48 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
49 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
50 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
51 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
52 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
53 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
54 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
55 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
56 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
57 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING }
58 };
59
60 const struct uci_blob_param_list route_attr_list = {
61 .n_params = __ROUTE_MAX,
62 .params = route_attr,
63 };
64
65
66 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
67 static struct device_prefix *ula_prefix = NULL;
68 static struct uloop_timeout valid_until_timeout;
69
70
71 static void
72 clear_if_addr(union if_addr *a, int mask)
73 {
74 int m_bytes = (mask + 7) / 8;
75 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
76 uint8_t *p = (uint8_t *) a;
77
78 if (m_bytes < sizeof(*a))
79 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
80
81 p[m_bytes - 1] &= ~m_clear;
82 }
83
84 static bool
85 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
86 {
87 union if_addr *p1, *p2;
88
89 p1 = alloca(sizeof(*a1));
90 p2 = alloca(sizeof(*a2));
91
92 memcpy(p1, a1, sizeof(*a1));
93 clear_if_addr(p1, mask);
94 memcpy(p2, a2, sizeof(*a2));
95 clear_if_addr(p2, mask);
96
97 return !memcmp(p1, p2, sizeof(*p1));
98 }
99
100 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
101 const union if_addr *addr, uint8_t mask, unsigned int table,
102 struct interface *in_iface, const char *action)
103 {
104 struct iprule rule = {
105 .flags = IPRULE_PRIORITY,
106 .priority = priority
107 };
108
109 if (addr) {
110 rule.flags |= IPRULE_SRC;
111 rule.src_addr = *addr;
112 rule.src_mask = mask;
113 }
114
115 if (table) {
116 rule.flags |= IPRULE_LOOKUP;
117 rule.lookup = table;
118
119 if (!rule.lookup)
120 return 0;
121 } else if (action) {
122 rule.flags |= IPRULE_ACTION;
123 system_resolve_iprule_action(action, &rule.action);
124 }
125
126 if (in_iface && in_iface->l3_dev.dev) {
127 rule.flags |= IPRULE_IN;
128 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
129 }
130
131 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
132
133 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
134 }
135
136 static bool
137 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
138 {
139 struct device_addr *addr;
140
141 vlist_for_each_element(&ip->addr, addr, node) {
142 if (!addr->enabled)
143 continue;
144
145 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
146 continue;
147
148 // Handle offlink addresses correctly
149 unsigned int mask = addr->mask;
150 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
151 (addr->flags & DEVADDR_OFFLINK))
152 mask = 128;
153
154 if (!match_if_addr(&addr->addr, a, mask))
155 continue;
156
157 return true;
158 }
159
160 return false;
161 }
162
163 static void
164 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
165 bool v6, struct device_route **res)
166 {
167 struct device_route *route;
168
169 vlist_for_each_element(&ip->route, route, node) {
170 if (!route->enabled)
171 continue;
172
173 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
174 continue;
175
176 if (!match_if_addr(&route->addr, a, route->mask))
177 continue;
178
179 if (route->flags & DEVROUTE_TABLE)
180 continue;
181
182 if (!*res || route->mask < (*res)->mask)
183 *res = route;
184 }
185 }
186
187 static bool
188 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
189 {
190 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
191 __find_ip_addr_target(&iface->config_ip, a, v6);
192 }
193
194 static void
195 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
196 bool v6, struct device_route **route)
197 {
198 __find_ip_route_target(&iface->proto_ip, a, v6, route);
199 __find_ip_route_target(&iface->config_ip, a, v6, route);
200 }
201
202 struct interface *
203 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
204 {
205 struct device_route *route, *r_next = NULL;
206 bool defaultroute_target = false;
207 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
208
209 route = calloc(1, sizeof(*route));
210 if (!route)
211 return NULL;
212
213 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
214 route->mask = v6 ? 128 : 32;
215 if (memcmp(&route->addr, addr, addrsize) == 0)
216 defaultroute_target = true;
217 else
218 memcpy(&route->addr, addr, addrsize);
219
220 if (iface) {
221 /* look for locally addressable target first */
222 if (interface_ip_find_addr_target(iface, addr, v6))
223 goto done;
224
225 /* do not stop at the first route, let the lookup compare
226 * masks to find the best match */
227 interface_ip_find_route_target(iface, addr, v6, &r_next);
228 } else {
229 vlist_for_each_element(&interfaces, iface, node) {
230 /* look for locally addressable target first */
231 if (interface_ip_find_addr_target(iface, addr, v6))
232 goto done;
233
234 /* do not stop at the first route, let the lookup compare
235 * masks to find the best match */
236 interface_ip_find_route_target(iface, addr, v6, &r_next);
237 }
238 }
239
240 if (!r_next) {
241 free(route);
242 return NULL;
243 }
244
245 iface = r_next->iface;
246 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
247 route->mtu = r_next->mtu;
248 route->metric = r_next->metric;
249 route->table = r_next->table;
250
251 done:
252 route->iface = iface;
253 if (defaultroute_target)
254 free(route);
255 else
256 vlist_add(&iface->host_routes, &route->node, route);
257 return iface;
258 }
259
260 void
261 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
262 {
263 struct interface_ip_settings *ip;
264 struct blob_attr *tb[__ROUTE_MAX], *cur;
265 struct device_route *route;
266 int af = v6 ? AF_INET6 : AF_INET;
267 bool is_proto_route = !!iface;
268
269 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
270
271 if (!iface) {
272 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
273 return;
274
275 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
276 if (!iface)
277 return;
278
279 ip = &iface->config_ip;
280 } else {
281 ip = &iface->proto_ip;
282 }
283
284 route = calloc(1, sizeof(*route));
285 if (!route)
286 return;
287
288 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
289 route->mask = v6 ? 128 : 32;
290 if ((cur = tb[ROUTE_MASK]) != NULL) {
291 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
292 if (route->mask > (v6 ? 128 : 32))
293 goto error;
294 }
295
296 if ((cur = tb[ROUTE_TARGET]) != NULL) {
297 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
298 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
299 goto error;
300 }
301 }
302
303 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
304 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
305 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
306 goto error;
307 }
308 }
309
310 if ((cur = tb[ROUTE_METRIC]) != NULL) {
311 route->metric = blobmsg_get_u32(cur);
312 route->flags |= DEVROUTE_METRIC;
313 } else
314 route->metric = iface->metric;
315
316 if ((cur = tb[ROUTE_MTU]) != NULL) {
317 route->mtu = blobmsg_get_u32(cur);
318 route->flags |= DEVROUTE_MTU;
319 }
320
321 // Use source-based routing
322 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
323 char *saveptr, *source = alloca(blobmsg_data_len(cur));
324 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
325
326 const char *addr = strtok_r(source, "/", &saveptr);
327 const char *mask = strtok_r(NULL, "/", &saveptr);
328
329 if (!addr || inet_pton(af, addr, &route->source) < 1) {
330 DPRINTF("Failed to parse route source: %s\n", addr);
331 goto error;
332 }
333
334 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
335 }
336
337 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
338 route->flags |= DEVROUTE_ONLINK;
339
340 if (is_proto_route) {
341 route->table = (v6) ? iface->ip6table : iface->ip4table;
342 route->flags |= DEVROUTE_SRCTABLE;
343 }
344
345 if ((cur = tb[ROUTE_TABLE]) != NULL) {
346 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
347 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
348 goto error;
349 }
350
351 /* only set the table flag if not using the main (default) table */
352 if (system_is_default_rt_table(route->table))
353 route->table = 0;
354
355 if (route->table)
356 route->flags |= DEVROUTE_TABLE;
357 }
358
359 if ((cur = tb[ROUTE_VALID]) != NULL) {
360 int64_t valid = blobmsg_get_u32(cur);
361 int64_t valid_until = valid + (int64_t)system_get_rtime();
362 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
363 route->valid_until = valid_until;
364 }
365
366 if ((cur = tb[ROUTE_TYPE]) != NULL) {
367 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
368 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
369 goto error;
370 }
371 route->flags |= DEVROUTE_TYPE;
372 }
373
374 vlist_add(&ip->route, &route->node, route);
375 return;
376
377 error:
378 free(route);
379 }
380
381 static int
382 addr_cmp(const void *k1, const void *k2, void *ptr)
383 {
384 return memcmp(k1, k2, sizeof(struct device_addr) -
385 offsetof(struct device_addr, flags));
386 }
387
388 static int
389 route_cmp(const void *k1, const void *k2, void *ptr)
390 {
391 const struct device_route *r1 = k1, *r2 = k2;
392
393 if (r1->mask != r2->mask)
394 return r2->mask - r1->mask;
395
396 if (r1->metric != r2->metric)
397 return r1->metric - r2->metric;
398
399 if (r1->flags != r2->flags)
400 return r2->flags - r1->flags;
401
402 if (r1->sourcemask != r2->sourcemask)
403 return r1->sourcemask - r2->sourcemask;
404
405 if (r1->table != r2->table)
406 return r1->table - r2->table;
407
408 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
409 if (maskcmp)
410 return maskcmp;
411
412 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
413 }
414
415 static int
416 prefix_cmp(const void *k1, const void *k2, void *ptr)
417 {
418 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
419 offsetof(struct device_prefix, addr));
420 }
421
422 static void
423 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
424 {
425 struct device *dev = iface->l3_dev.dev;
426 struct device_route route;
427
428 if (addr->flags & DEVADDR_OFFLINK)
429 return;
430
431 memset(&route, 0, sizeof(route));
432 route.iface = iface;
433 route.flags = addr->flags;
434 route.mask = addr->mask;
435 memcpy(&route.addr, &addr->addr, sizeof(route.addr));
436 clear_if_addr(&route.addr, route.mask);
437
438 if (add) {
439 route.flags |= DEVADDR_KERNEL;
440 system_del_route(dev, &route);
441
442 route.flags &= ~DEVADDR_KERNEL;
443 route.metric = iface->metric;
444 system_add_route(dev, &route);
445 } else {
446 system_del_route(dev, &route);
447 }
448 }
449
450 static void
451 interface_update_proto_addr(struct vlist_tree *tree,
452 struct vlist_node *node_new,
453 struct vlist_node *node_old)
454 {
455 struct interface_ip_settings *ip;
456 struct interface *iface;
457 struct device *dev;
458 struct device_addr *a_new = NULL, *a_old = NULL;
459 bool replace = false;
460 bool keep = false;
461 bool v6 = false;
462
463 ip = container_of(tree, struct interface_ip_settings, addr);
464 iface = ip->iface;
465 dev = iface->l3_dev.dev;
466
467 if (!node_new || !node_old)
468 iface->updated |= IUF_ADDRESS;
469
470 if (node_new) {
471 a_new = container_of(node_new, struct device_addr, node);
472
473 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
474 !a_new->broadcast) {
475
476 uint32_t mask = ~0;
477 uint32_t *a = (uint32_t *) &a_new->addr;
478
479 mask >>= a_new->mask;
480 a_new->broadcast = *a | htonl(mask);
481 }
482 }
483
484 if (node_old)
485 a_old = container_of(node_old, struct device_addr, node);
486
487 if (a_new && a_old) {
488 keep = true;
489
490 if (a_old->flags != a_new->flags || a_old->failed)
491 keep = false;
492
493 if (a_old->valid_until != a_new->valid_until ||
494 a_old->preferred_until != a_new->preferred_until)
495 replace = true;
496
497 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
498 a_new->broadcast != a_old->broadcast)
499 keep = false;
500 }
501
502 if (node_old) {
503 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
504 interface_handle_subnet_route(iface, a_old, false);
505
506 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
507 v6 = true;
508
509 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
510
511 //This is needed for source routing to work correctly. If a device
512 //has two connections to a network using the same subnet, adding
513 //only the network-rule will cause packets to be routed through the
514 //first matching network (source IP matches both masks).
515 if (table) {
516 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
517 (v6) ? 128 : 32, table, NULL, NULL);
518 set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
519 a_old->mask, table, NULL, NULL);
520 }
521
522 system_del_address(dev, a_old);
523 }
524 free(a_old->pclass);
525 free(a_old);
526 }
527
528 if (node_new) {
529 a_new->enabled = true;
530 if (!(a_new->flags & DEVADDR_EXTERNAL) && (!keep || replace)) {
531 if (system_add_address(dev, a_new))
532 a_new->failed = true;
533
534 if (!keep) {
535 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
536 v6 = true;
537
538 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
539
540 if (table) {
541 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
542 (v6) ? 128 : 32, table, NULL, NULL);
543 set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
544 a_new->mask, table, NULL, NULL);
545 }
546 }
547
548 if (iface->metric)
549 interface_handle_subnet_route(iface, a_new, true);
550 }
551 }
552 }
553
554 static bool
555 enable_route(struct interface_ip_settings *ip, struct device_route *route)
556 {
557 if (ip->no_defaultroute && !route->mask)
558 return false;
559
560 return ip->enabled;
561 }
562
563 static void
564 interface_update_proto_route(struct vlist_tree *tree,
565 struct vlist_node *node_new,
566 struct vlist_node *node_old)
567 {
568 struct interface_ip_settings *ip;
569 struct interface *iface;
570 struct device *dev;
571 struct device_route *route_old, *route_new;
572 bool keep = false;
573
574 ip = container_of(tree, struct interface_ip_settings, route);
575 iface = ip->iface;
576 dev = iface->l3_dev.dev;
577
578 if (!node_new || !node_old)
579 iface->updated |= IUF_ROUTE;
580
581 route_old = container_of(node_old, struct device_route, node);
582 route_new = container_of(node_new, struct device_route, node);
583
584 if (node_old && node_new)
585 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
586 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
587 (route_old->valid_until == route_new->valid_until) && !route_old->failed;
588
589 if (node_old) {
590 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
591 system_del_route(dev, route_old);
592
593 free(route_old);
594 }
595
596 if (node_new) {
597 bool _enabled = enable_route(ip, route_new);
598
599 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
600 if (system_add_route(dev, route_new))
601 route_new->failed = true;
602
603 route_new->iface = iface;
604 route_new->enabled = _enabled;
605 }
606 }
607
608 static void
609 interface_update_host_route(struct vlist_tree *tree,
610 struct vlist_node *node_new,
611 struct vlist_node *node_old)
612 {
613 struct interface *iface;
614 struct device *dev;
615 struct device_route *route_old, *route_new;
616
617 iface = container_of(tree, struct interface, host_routes);
618 dev = iface->l3_dev.dev;
619
620 route_old = container_of(node_old, struct device_route, node);
621 route_new = container_of(node_new, struct device_route, node);
622
623 if (node_old) {
624 system_del_route(dev, route_old);
625 free(route_old);
626 }
627
628 if (node_new) {
629 if (system_add_route(dev, route_new))
630 route_new->failed = true;
631 }
632 }
633
634 static void
635 random_ifaceid(struct in6_addr *addr)
636 {
637 static bool initialized = false;
638 struct timeval t;
639
640 if (!initialized) {
641 long int seed = 0;
642 gettimeofday(&t, NULL);
643 seed = t.tv_sec ^ t.tv_usec ^ getpid();
644 srand48(seed);
645 initialized = true;
646 }
647 addr->s6_addr32[2] = (uint32_t)mrand48();
648 addr->s6_addr32[3] = (uint32_t)mrand48();
649 }
650
651 static void
652 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
653 {
654 /* get mac address */
655 uint8_t *macaddr = iface->l3_dev.dev->settings.macaddr;
656 uint8_t *ifaceid = addr->s6_addr + 8;
657 memcpy(ifaceid,macaddr,3);
658 memcpy(ifaceid + 5,macaddr + 3, 3);
659 ifaceid[3] = 0xff;
660 ifaceid[4] = 0xfe;
661 ifaceid[0] ^= 0x02;
662 }
663
664 static void
665 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
666 {
667 /* generate new iface id */
668 switch (iface->assignment_iface_id_selection) {
669 case IFID_FIXED:
670 /* fixed */
671 /* copy host part from assignment_fixed_iface_id */
672 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
673 break;
674 case IFID_RANDOM:
675 /* randomize last 64 bits */
676 random_ifaceid(addr);
677 break;
678 case IFID_EUI64:
679 /* eui64 */
680 eui64_ifaceid(iface, addr);
681 break;
682 }
683 }
684
685 static void
686 interface_set_prefix_address(struct device_prefix_assignment *assignment,
687 const struct device_prefix *prefix, struct interface *iface, bool add)
688 {
689 const struct interface *uplink = prefix->iface;
690 if (!iface->l3_dev.dev)
691 return;
692
693 struct device *l3_downlink = iface->l3_dev.dev;
694
695 struct device_addr addr;
696 struct device_route route;
697 memset(&addr, 0, sizeof(addr));
698 memset(&route, 0, sizeof(route));
699
700 if (IN6_IS_ADDR_UNSPECIFIED(&assignment->addr)) {
701 addr.addr.in6 = prefix->addr;
702 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
703 generate_ifaceid(iface, &addr.addr.in6);
704 assignment->addr = addr.addr.in6;
705 }
706 else
707 addr.addr.in6 = assignment->addr;
708
709 addr.mask = assignment->length;
710 addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
711 addr.preferred_until = prefix->preferred_until;
712 addr.valid_until = prefix->valid_until;
713
714 route.flags = DEVADDR_INET6;
715 route.mask = addr.mask < 64 ? 64 : addr.mask;
716 route.addr = addr.addr;
717 clear_if_addr(&route.addr, route.mask);
718
719 if (!add && assignment->enabled) {
720 time_t now = system_get_rtime();
721 addr.preferred_until = now;
722 if (!addr.valid_until || addr.valid_until - now > 7200)
723 addr.valid_until = now + 7200;
724
725 if (prefix->iface) {
726 if (prefix->iface->ip6table)
727 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
728 addr.mask, prefix->iface->ip6table, iface, NULL);
729
730 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
731 addr.mask, 0, iface, "unreachable");
732 }
733
734 system_del_route(l3_downlink, &route);
735 system_add_address(l3_downlink, &addr);
736
737 assignment->enabled = false;
738 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
739 !system_add_address(l3_downlink, &addr)) {
740
741 if (prefix->iface && !assignment->enabled) {
742 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
743 addr.mask, 0, iface, "unreachable");
744
745 if (prefix->iface->ip6table)
746 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
747 addr.mask, prefix->iface->ip6table, iface, NULL);
748 }
749
750 route.metric = iface->metric;
751 system_add_route(l3_downlink, &route);
752
753 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
754 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
755 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
756
757 if (mtu > 0 && mtu_old > mtu)
758 system_update_ipv6_mtu(l3_downlink, mtu);
759 }
760
761 assignment->enabled = true;
762 }
763 }
764
765 static bool interface_prefix_assign(struct list_head *list,
766 struct device_prefix_assignment *assign)
767 {
768 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
769 struct device_prefix_assignment *c;
770 list_for_each_entry(c, list, head) {
771 if (assign->assigned != -1) {
772 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
773 list_add_tail(&assign->head, &c->head);
774 return true;
775 }
776 } else if (assign->assigned == -1) {
777 current = (current + asize) & (~asize);
778 if (current + asize < c->assigned) {
779 assign->assigned = current;
780 list_add_tail(&assign->head, &c->head);
781 return true;
782 }
783 }
784 current = (c->assigned + (1 << (64 - c->length)));
785 }
786 return false;
787 }
788
789 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
790 {
791 struct device_prefix_assignment *c;
792 struct interface *iface;
793
794 // Delete all assignments
795 while (!list_empty(&prefix->assignments)) {
796 c = list_first_entry(&prefix->assignments,
797 struct device_prefix_assignment, head);
798 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
799 interface_set_prefix_address(c, prefix, iface, false);
800 list_del(&c->head);
801 free(c);
802 }
803
804 if (!setup)
805 return;
806
807 // End-of-assignment sentinel
808 c = malloc(sizeof(*c) + 1);
809 c->assigned = 1 << (64 - prefix->length);
810 c->length = 64;
811 c->name[0] = 0;
812 c->addr = in6addr_any;
813 list_add(&c->head, &prefix->assignments);
814
815 // Excluded prefix
816 if (prefix->excl_length > 0) {
817 const char name[] = "!excluded";
818 c = malloc(sizeof(*c) + sizeof(name));
819 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
820 ((1 << (64 - prefix->length)) - 1);
821 c->length = prefix->excl_length;
822 c->addr = in6addr_any;
823 memcpy(c->name, name, sizeof(name));
824 list_add(&c->head, &prefix->assignments);
825 }
826
827 bool assigned_any = false;
828 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
829 vlist_for_each_element(&interfaces, iface, node) {
830 if (iface->assignment_length < 48 ||
831 iface->assignment_length > 64)
832 continue;
833
834 // Test whether there is a matching class
835 if (!list_empty(&iface->assignment_classes)) {
836 bool found = false;
837
838 struct interface_assignment_class *c;
839 list_for_each_entry(c, &iface->assignment_classes, head) {
840 if (!strcmp(c->name, prefix->pclass)) {
841 found = true;
842 break;
843 }
844 }
845
846 if (!found)
847 continue;
848 }
849
850 size_t namelen = strlen(iface->name) + 1;
851 c = malloc(sizeof(*c) + namelen);
852 c->length = iface->assignment_length;
853 c->assigned = iface->assignment_hint;
854 c->addr = in6addr_any;
855 c->enabled = false;
856 memcpy(c->name, iface->name, namelen);
857
858 // First process all custom assignments, put all others in later-list
859 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
860 if (c->assigned != -1) {
861 c->assigned = -1;
862 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
863 "of size %hhu for %s, trying other\n", c->length, c->name);
864 }
865
866 struct list_head *next = &assign_later;
867 struct device_prefix_assignment *n;
868 list_for_each_entry(n, &assign_later, head) {
869 if (n->length < c->length) {
870 next = &n->head;
871 break;
872 }
873 }
874 list_add_tail(&c->head, next);
875 }
876
877 if (c->assigned != -1)
878 assigned_any = true;
879 }
880
881 // Then try to assign all other + failed custom assignments
882 while (!list_empty(&assign_later)) {
883 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
884 list_del(&c->head);
885
886 bool assigned = false;
887 do {
888 assigned = interface_prefix_assign(&prefix->assignments, c);
889 } while (!assigned && ++c->length <= 64);
890
891 if (!assigned) {
892 netifd_log_message(L_WARNING, "Failed to assign subprefix "
893 "of size %hhu for %s\n", c->length, c->name);
894 free(c);
895 } else {
896 assigned_any = true;
897 }
898 }
899
900 list_for_each_entry(c, &prefix->assignments, head)
901 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
902 interface_set_prefix_address(c, prefix, iface, true);
903
904 if (!assigned_any)
905 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
906 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
907 }
908
909
910 void interface_refresh_assignments(bool hint)
911 {
912 static bool refresh = false;
913 if (!hint && refresh) {
914 struct device_prefix *p;
915 list_for_each_entry(p, &prefixes, head)
916 interface_update_prefix_assignments(p, true);
917 }
918 refresh = hint;
919 }
920
921
922 static void
923 interface_update_prefix(struct vlist_tree *tree,
924 struct vlist_node *node_new,
925 struct vlist_node *node_old)
926 {
927 struct device_prefix *prefix_old, *prefix_new;
928 prefix_old = container_of(node_old, struct device_prefix, node);
929 prefix_new = container_of(node_new, struct device_prefix, node);
930
931 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
932 if (tree && (!node_new || !node_old))
933 ip->iface->updated |= IUF_PREFIX;
934
935 struct device_route route;
936 memset(&route, 0, sizeof(route));
937 route.flags = DEVADDR_INET6;
938 route.metric = INT32_MAX;
939 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
940 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
941
942
943 struct device_prefix_assignment *c;
944 struct interface *iface;
945
946 if (node_old && node_new) {
947 // Move assignments and refresh addresses to update valid times
948 list_splice(&prefix_old->assignments, &prefix_new->assignments);
949
950 list_for_each_entry(c, &prefix_new->assignments, head)
951 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
952 interface_set_prefix_address(c, prefix_new, iface, true);
953 } else if (node_new) {
954 // Set null-route to avoid routing loops
955 system_add_route(NULL, &route);
956
957 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
958 interface_update_prefix_assignments(prefix_new, true);
959 } else if (node_old) {
960 // Remove null-route
961 interface_update_prefix_assignments(prefix_old, false);
962 system_del_route(NULL, &route);
963 }
964
965 if (node_old) {
966 if (prefix_old->head.next)
967 list_del(&prefix_old->head);
968 free(prefix_old);
969 }
970
971 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
972 list_add(&prefix_new->head, &prefixes);
973
974 }
975
976 struct device_prefix*
977 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
978 uint8_t length, time_t valid_until, time_t preferred_until,
979 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
980 {
981 if (!pclass)
982 pclass = (iface) ? iface->name : "local";
983
984 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
985 prefix->length = length;
986 prefix->addr = *addr;
987 prefix->preferred_until = preferred_until;
988 prefix->valid_until = valid_until;
989 prefix->iface = iface;
990 INIT_LIST_HEAD(&prefix->assignments);
991
992 if (excl_addr) {
993 prefix->excl_addr = *excl_addr;
994 prefix->excl_length = excl_length;
995 }
996
997 strcpy(prefix->pclass, pclass);
998
999 if (iface)
1000 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1001 else
1002 interface_update_prefix(NULL, &prefix->node, NULL);
1003
1004 return prefix;
1005 }
1006
1007 void
1008 interface_ip_set_ula_prefix(const char *prefix)
1009 {
1010 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1011 if (prefix)
1012 strncpy(buf, prefix, sizeof(buf) - 1);
1013 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1014
1015 struct in6_addr addr;
1016 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1017 if (ula_prefix) {
1018 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1019 ula_prefix = NULL;
1020 }
1021 return;
1022 }
1023
1024 int length;
1025 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1026 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1027 return;
1028
1029 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1030 ula_prefix->length != length) {
1031 if (ula_prefix)
1032 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1033
1034 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1035 0, 0, NULL, 0, NULL);
1036 }
1037 }
1038
1039 void
1040 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1041 {
1042 struct dns_server *s;
1043
1044 s = calloc(1, sizeof(*s));
1045 if (!s)
1046 return;
1047
1048 s->af = AF_INET;
1049 if (inet_pton(s->af, str, &s->addr.in))
1050 goto add;
1051
1052 s->af = AF_INET6;
1053 if (inet_pton(s->af, str, &s->addr.in))
1054 goto add;
1055
1056 free(s);
1057 return;
1058
1059 add:
1060 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1061 s->af == AF_INET6 ? '6' : '4', str);
1062 vlist_simple_add(&ip->dns_servers, &s->node);
1063 }
1064
1065 void
1066 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1067 {
1068 struct blob_attr *cur;
1069 int rem;
1070
1071 blobmsg_for_each_attr(cur, list, rem) {
1072 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1073 continue;
1074
1075 if (!blobmsg_check_attr(cur, NULL))
1076 continue;
1077
1078 interface_add_dns_server(ip, blobmsg_data(cur));
1079 }
1080 }
1081
1082 static void
1083 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1084 {
1085 struct dns_search_domain *s;
1086 int len = strlen(str);
1087
1088 s = calloc(1, sizeof(*s) + len + 1);
1089 if (!s)
1090 return;
1091
1092 D(INTERFACE, "Add DNS search domain: %s\n", str);
1093 memcpy(s->name, str, len);
1094 vlist_simple_add(&ip->dns_search, &s->node);
1095 }
1096
1097 void
1098 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1099 {
1100 struct blob_attr *cur;
1101 int rem;
1102
1103 blobmsg_for_each_attr(cur, list, rem) {
1104 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1105 continue;
1106
1107 if (!blobmsg_check_attr(cur, NULL))
1108 continue;
1109
1110 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1111 }
1112 }
1113
1114 static void
1115 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1116 {
1117 struct dns_server *s;
1118 struct dns_search_domain *d;
1119 const char *str;
1120 char buf[INET6_ADDRSTRLEN];
1121
1122 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1123 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1124 if (!str)
1125 continue;
1126
1127 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1128 fprintf(f, "nameserver %s%%%s\n", str, dev);
1129 else
1130 fprintf(f, "nameserver %s\n", str);
1131 }
1132
1133 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1134 fprintf(f, "search %s\n", d->name);
1135 }
1136 }
1137
1138 void
1139 interface_write_resolv_conf(void)
1140 {
1141 struct interface *iface;
1142 char *path = alloca(strlen(resolv_conf) + 5);
1143 FILE *f;
1144 uint32_t crcold, crcnew;
1145
1146 sprintf(path, "%s.tmp", resolv_conf);
1147 unlink(path);
1148 f = fopen(path, "w+");
1149 if (!f) {
1150 D(INTERFACE, "Failed to open %s for writing\n", path);
1151 return;
1152 }
1153
1154 vlist_for_each_element(&interfaces, iface, node) {
1155 if (iface->state != IFS_UP)
1156 continue;
1157
1158 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1159 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1160 vlist_simple_empty(&iface->config_ip.dns_search) &&
1161 vlist_simple_empty(&iface->config_ip.dns_servers))
1162 continue;
1163
1164 fprintf(f, "# Interface %s\n", iface->name);
1165 write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
1166 if (!iface->proto_ip.no_dns)
1167 write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
1168 }
1169 fflush(f);
1170 rewind(f);
1171 crcnew = crc32_file(f);
1172 fclose(f);
1173
1174 crcold = crcnew + 1;
1175 f = fopen(resolv_conf, "r");
1176 if (f) {
1177 crcold = crc32_file(f);
1178 fclose(f);
1179 }
1180
1181 if (crcold == crcnew) {
1182 unlink(path);
1183 } else if (rename(path, resolv_conf) < 0) {
1184 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1185 unlink(path);
1186 }
1187 }
1188
1189 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1190 {
1191 struct device_addr *addr;
1192 struct device_route *route;
1193 struct device *dev;
1194 struct interface *iface;
1195
1196 ip->enabled = enabled;
1197 iface = ip->iface;
1198 dev = iface->l3_dev.dev;
1199 if (!dev)
1200 return;
1201
1202 vlist_for_each_element(&ip->addr, addr, node) {
1203 if (addr->enabled == enabled)
1204 continue;
1205
1206 if (enabled) {
1207 system_add_address(dev, addr);
1208 if (iface->metric)
1209 interface_handle_subnet_route(iface, addr, true);
1210 } else {
1211 interface_handle_subnet_route(iface, addr, false);
1212 system_del_address(dev, addr);
1213 }
1214 addr->enabled = enabled;
1215 }
1216
1217 vlist_for_each_element(&ip->route, route, node) {
1218 bool _enabled = enabled;
1219
1220 if (!enable_route(ip, route))
1221 _enabled = false;
1222
1223 if (route->enabled == _enabled)
1224 continue;
1225
1226 if (_enabled) {
1227 if (!(route->flags & DEVROUTE_METRIC))
1228 route->metric = ip->iface->metric;
1229
1230 if (system_add_route(dev, route))
1231 route->failed = true;
1232 } else
1233 system_del_route(dev, route);
1234 route->enabled = _enabled;
1235 }
1236
1237 struct device_prefix *c;
1238 struct device_prefix_assignment *a;
1239 list_for_each_entry(c, &prefixes, head)
1240 list_for_each_entry(a, &c->assignments, head)
1241 if (!strcmp(a->name, ip->iface->name))
1242 interface_set_prefix_address(a, c, ip->iface, enabled);
1243
1244 if (ip->iface && ip->iface->l3_dev.dev)
1245 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1246 NULL, 0, 0, ip->iface, "failed_policy");
1247 }
1248
1249 void
1250 interface_ip_update_start(struct interface_ip_settings *ip)
1251 {
1252 if (ip != &ip->iface->config_ip) {
1253 vlist_simple_update(&ip->dns_servers);
1254 vlist_simple_update(&ip->dns_search);
1255 }
1256 vlist_update(&ip->route);
1257 vlist_update(&ip->addr);
1258 vlist_update(&ip->prefix);
1259 }
1260
1261 void
1262 interface_ip_update_complete(struct interface_ip_settings *ip)
1263 {
1264 vlist_simple_flush(&ip->dns_servers);
1265 vlist_simple_flush(&ip->dns_search);
1266 vlist_flush(&ip->route);
1267 vlist_flush(&ip->addr);
1268 vlist_flush(&ip->prefix);
1269 interface_write_resolv_conf();
1270 }
1271
1272 void
1273 interface_ip_flush(struct interface_ip_settings *ip)
1274 {
1275 if (ip == &ip->iface->proto_ip)
1276 vlist_flush_all(&ip->iface->host_routes);
1277 vlist_simple_flush_all(&ip->dns_servers);
1278 vlist_simple_flush_all(&ip->dns_search);
1279 vlist_flush_all(&ip->route);
1280 vlist_flush_all(&ip->addr);
1281 vlist_flush_all(&ip->prefix);
1282 }
1283
1284 static void
1285 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1286 {
1287 ip->iface = iface;
1288 ip->enabled = true;
1289 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1290 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1291 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1292 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1293 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1294 }
1295
1296 void
1297 interface_ip_init(struct interface *iface)
1298 {
1299 __interface_ip_init(&iface->proto_ip, iface);
1300 __interface_ip_init(&iface->config_ip, iface);
1301 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1302 }
1303
1304 static void
1305 interface_ip_valid_until_handler(struct uloop_timeout *t)
1306 {
1307 time_t now = system_get_rtime();
1308 struct interface *iface;
1309 vlist_for_each_element(&interfaces, iface, node) {
1310 if (iface->state != IFS_UP)
1311 continue;
1312
1313 struct device_addr *addr, *addrp;
1314 struct device_route *route, *routep;
1315 struct device_prefix *pref, *prefp;
1316
1317 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1318 if (addr->valid_until && addr->valid_until < now)
1319 vlist_delete(&iface->proto_ip.addr, &addr->node);
1320
1321 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1322 if (route->valid_until && route->valid_until < now)
1323 vlist_delete(&iface->proto_ip.route, &route->node);
1324
1325 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1326 if (pref->valid_until && pref->valid_until < now)
1327 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1328
1329 }
1330
1331 uloop_timeout_set(t, 1000);
1332 }
1333
1334 static void __init
1335 interface_ip_init_worker(void)
1336 {
1337 valid_until_timeout.cb = interface_ip_valid_until_handler;
1338 uloop_timeout_set(&valid_until_timeout, 1000);
1339 }
OpenWrt Network interface configuration daemon