2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2012 Steven Barth <steven@midlink.org>
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
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.
20 #include <arpa/inet.h>
21 #include <netinet/in.h>
25 #include "interface.h"
26 #include "interface-ip.h"
47 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
48 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
49 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
50 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
51 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
52 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
53 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
54 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
55 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
56 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
57 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
58 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
59 [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
62 const struct uci_blob_param_list route_attr_list = {
63 .n_params = __ROUTE_MAX,
68 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
69 static struct device_prefix *ula_prefix = NULL;
70 static struct uloop_timeout valid_until_timeout;
74 clear_if_addr(union if_addr *a, int mask)
76 int m_bytes = (mask + 7) / 8;
77 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
78 uint8_t *p = (uint8_t *) a;
80 if (m_bytes < sizeof(*a))
81 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
83 p[m_bytes - 1] &= ~m_clear;
87 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
89 union if_addr *p1, *p2;
91 p1 = alloca(sizeof(*a1));
92 p2 = alloca(sizeof(*a2));
94 memcpy(p1, a1, sizeof(*a1));
95 clear_if_addr(p1, mask);
96 memcpy(p2, a2, sizeof(*a2));
97 clear_if_addr(p2, mask);
99 return !memcmp(p1, p2, sizeof(*p1));
102 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
103 const union if_addr *addr, uint8_t mask, unsigned int table,
104 struct interface *in_iface, const char *action, bool src)
106 struct iprule rule = {
107 .flags = IPRULE_PRIORITY,
113 rule.flags |= IPRULE_SRC;
114 rule.src_addr = *addr;
115 rule.src_mask = mask;
117 rule.flags |= IPRULE_DEST;
118 rule.dest_addr = *addr;
119 rule.dest_mask = mask;
124 rule.flags |= IPRULE_LOOKUP;
130 rule.flags |= IPRULE_ACTION;
131 system_resolve_iprule_action(action, &rule.action);
134 if (in_iface && in_iface->l3_dev.dev) {
135 rule.flags |= IPRULE_IN;
136 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
139 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
141 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
144 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
146 struct iprule rule = {
147 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
148 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
149 .lookup = (v6) ? iface->ip6table : iface->ip4table,
156 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
158 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
162 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
164 struct device_addr *addr;
166 vlist_for_each_element(&ip->addr, addr, node) {
170 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
173 // Handle offlink addresses correctly
174 unsigned int mask = addr->mask;
175 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
176 (addr->flags & DEVADDR_OFFLINK))
179 if (!match_if_addr(&addr->addr, a, mask))
189 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
190 bool v6, struct device_route **res)
192 struct device_route *route;
194 vlist_for_each_element(&ip->route, route, node) {
198 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
201 if (!match_if_addr(&route->addr, a, route->mask))
204 if (route->flags & DEVROUTE_TABLE)
207 if (!*res || route->mask < (*res)->mask)
213 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
215 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
216 __find_ip_addr_target(&iface->config_ip, a, v6);
220 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
221 bool v6, struct device_route **route)
223 __find_ip_route_target(&iface->proto_ip, a, v6, route);
224 __find_ip_route_target(&iface->config_ip, a, v6, route);
228 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
230 struct device_route *route, *r_next = NULL;
231 bool defaultroute_target = false;
232 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
234 route = calloc(1, sizeof(*route));
238 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
239 route->mask = v6 ? 128 : 32;
240 if (memcmp(&route->addr, addr, addrsize) == 0)
241 defaultroute_target = true;
243 memcpy(&route->addr, addr, addrsize);
246 /* look for locally addressable target first */
247 if (interface_ip_find_addr_target(iface, addr, v6))
250 /* do not stop at the first route, let the lookup compare
251 * masks to find the best match */
252 interface_ip_find_route_target(iface, addr, v6, &r_next);
254 vlist_for_each_element(&interfaces, iface, node) {
255 /* look for locally addressable target first */
256 if (interface_ip_find_addr_target(iface, addr, v6))
259 /* do not stop at the first route, let the lookup compare
260 * masks to find the best match */
261 interface_ip_find_route_target(iface, addr, v6, &r_next);
270 iface = r_next->iface;
271 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
272 route->mtu = r_next->mtu;
273 route->metric = r_next->metric;
274 route->table = r_next->table;
277 route->iface = iface;
278 if (defaultroute_target)
281 vlist_add(&iface->host_routes, &route->node, route);
286 interface_set_route_info(struct interface *iface, struct device_route *route)
288 bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
293 if (!(route->flags & DEVROUTE_METRIC))
294 route->metric = iface->metric;
296 if (!(route->flags & DEVROUTE_TABLE)) {
297 route->table = (v6) ? iface->ip6table : iface->ip4table;
299 route->flags |= DEVROUTE_SRCTABLE;
304 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
306 struct interface_ip_settings *ip;
307 struct blob_attr *tb[__ROUTE_MAX], *cur;
308 struct device_route *route;
309 int af = v6 ? AF_INET6 : AF_INET;
311 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
314 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
317 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
321 ip = &iface->config_ip;
323 ip = &iface->proto_ip;
326 route = calloc(1, sizeof(*route));
330 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
331 route->mask = v6 ? 128 : 32;
332 if ((cur = tb[ROUTE_MASK]) != NULL) {
333 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
334 if (route->mask > (v6 ? 128 : 32))
338 if ((cur = tb[ROUTE_TARGET]) != NULL) {
339 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
340 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
345 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
346 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
347 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
352 if ((cur = tb[ROUTE_METRIC]) != NULL) {
353 route->metric = blobmsg_get_u32(cur);
354 route->flags |= DEVROUTE_METRIC;
357 if ((cur = tb[ROUTE_MTU]) != NULL) {
358 route->mtu = blobmsg_get_u32(cur);
359 route->flags |= DEVROUTE_MTU;
362 // Use source-based routing
363 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
364 char *saveptr, *source = alloca(blobmsg_data_len(cur));
365 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
367 const char *addr = strtok_r(source, "/", &saveptr);
368 const char *mask = strtok_r(NULL, "/", &saveptr);
370 if (!addr || inet_pton(af, addr, &route->source) < 1) {
371 DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
375 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
378 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
379 route->flags |= DEVROUTE_ONLINK;
381 if ((cur = tb[ROUTE_TABLE]) != NULL) {
382 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
383 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
387 /* only set the table flag if not using the main (default) table */
388 if (system_is_default_rt_table(route->table))
392 route->flags |= DEVROUTE_TABLE;
395 if ((cur = tb[ROUTE_VALID]) != NULL) {
396 int64_t valid = blobmsg_get_u32(cur);
397 int64_t valid_until = valid + (int64_t)system_get_rtime();
398 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
399 route->valid_until = valid_until;
402 if ((cur = tb[ROUTE_TYPE]) != NULL) {
403 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
404 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
407 route->flags |= DEVROUTE_TYPE;
410 if ((cur = tb[ROUTE_PROTO]) != NULL) {
411 if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
412 DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
415 route->flags |= DEVROUTE_PROTO;
418 interface_set_route_info(iface, route);
419 vlist_add(&ip->route, &route->node, route);
427 addr_cmp(const void *k1, const void *k2, void *ptr)
429 return memcmp(k1, k2, sizeof(struct device_addr) -
430 offsetof(struct device_addr, flags));
434 route_cmp(const void *k1, const void *k2, void *ptr)
436 const struct device_route *r1 = k1, *r2 = k2;
438 if (r1->mask != r2->mask)
439 return r2->mask - r1->mask;
441 if (r1->metric != r2->metric)
442 return r1->metric - r2->metric;
444 if (r1->flags != r2->flags)
445 return r2->flags - r1->flags;
447 if (r1->sourcemask != r2->sourcemask)
448 return r1->sourcemask - r2->sourcemask;
450 if (r1->table != r2->table)
451 return r1->table - r2->table;
453 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
457 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
461 prefix_cmp(const void *k1, const void *k2, void *ptr)
463 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
464 offsetof(struct device_prefix, addr));
468 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
470 struct device *dev = iface->l3_dev.dev;
471 struct device_route *r = &addr->subnet;
473 if (addr->flags & DEVADDR_OFFLINK)
477 if (!addr->subnet.iface)
480 system_del_route(dev, r);
481 memset(r, 0, sizeof(*r));
486 r->flags = addr->flags;
487 r->mask = addr->mask;
488 memcpy(&r->addr, &addr->addr, sizeof(r->addr));
489 clear_if_addr(&r->addr, r->mask);
491 if (!system_resolve_rt_proto("kernel", &r->proto))
494 r->flags |= DEVROUTE_PROTO;
495 system_del_route(dev, r);
497 r->flags &= ~DEVROUTE_PROTO;
498 interface_set_route_info(iface, r);
500 system_add_route(dev, r);
504 interface_add_addr_rules(struct device_addr *addr, bool enabled)
506 bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
508 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
509 (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
511 set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
512 &addr->addr, addr->mask, addr->policy_table, NULL,
517 interface_update_proto_addr(struct vlist_tree *tree,
518 struct vlist_node *node_new,
519 struct vlist_node *node_old)
521 struct interface_ip_settings *ip;
522 struct interface *iface;
524 struct device_addr *a_new = NULL, *a_old = NULL;
525 bool replace = false;
529 ip = container_of(tree, struct interface_ip_settings, addr);
531 dev = iface->l3_dev.dev;
533 if (!node_new || !node_old)
534 iface->updated |= IUF_ADDRESS;
537 a_new = container_of(node_new, struct device_addr, node);
539 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
542 /* /31 and /32 addressing need 255.255.255.255
543 * as broadcast address. */
544 if (a_new->mask >= 31) {
545 a_new->broadcast = (uint32_t) ~0;
548 uint32_t *a = (uint32_t *) &a_new->addr;
550 mask >>= a_new->mask;
551 a_new->broadcast = *a | htonl(mask);
557 a_old = container_of(node_old, struct device_addr, node);
559 if (a_new && a_old) {
562 if (a_old->flags != a_new->flags || a_old->failed)
565 if (a_old->valid_until != a_new->valid_until ||
566 a_old->preferred_until != a_new->preferred_until)
569 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
570 a_new->broadcast != a_old->broadcast)
575 if (a_old->enabled && !keep) {
576 //This is needed for source routing to work correctly. If a device
577 //has two connections to a network using the same subnet, adding
578 //only the network-rule will cause packets to be routed through the
579 //first matching network (source IP matches both masks).
580 if (a_old->policy_table)
581 interface_add_addr_rules(a_old, false);
583 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
584 interface_handle_subnet_route(iface, a_old, false);
585 system_del_address(dev, a_old);
593 a_new->enabled = true;
595 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
598 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
600 if (!keep || replace) {
601 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
602 if (system_add_address(dev, a_new))
603 a_new->failed = true;
605 if (iface->metric || a_new->policy_table)
606 interface_handle_subnet_route(iface, a_new, true);
610 if (a_new->policy_table)
611 interface_add_addr_rules(a_new, true);
618 enable_route(struct interface_ip_settings *ip, struct device_route *route)
620 if (ip->no_defaultroute && !route->mask)
627 interface_update_proto_route(struct vlist_tree *tree,
628 struct vlist_node *node_new,
629 struct vlist_node *node_old)
631 struct interface_ip_settings *ip;
632 struct interface *iface;
634 struct device_route *route_old, *route_new;
637 ip = container_of(tree, struct interface_ip_settings, route);
639 dev = iface->l3_dev.dev;
641 if (!node_new || !node_old)
642 iface->updated |= IUF_ROUTE;
644 route_old = container_of(node_old, struct device_route, node);
645 route_new = container_of(node_new, struct device_route, node);
647 if (node_old && node_new)
648 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
649 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
650 (route_old->proto == route_new->proto) && !route_old->failed;
653 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
654 system_del_route(dev, route_old);
660 bool _enabled = enable_route(ip, route_new);
662 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
663 if (system_add_route(dev, route_new))
664 route_new->failed = true;
666 route_new->iface = iface;
667 route_new->enabled = _enabled;
672 interface_update_host_route(struct vlist_tree *tree,
673 struct vlist_node *node_new,
674 struct vlist_node *node_old)
676 struct interface *iface;
678 struct device_route *route_old, *route_new;
680 iface = container_of(tree, struct interface, host_routes);
681 dev = iface->l3_dev.dev;
683 route_old = container_of(node_old, struct device_route, node);
684 route_new = container_of(node_new, struct device_route, node);
687 system_del_route(dev, route_old);
692 if (system_add_route(dev, route_new))
693 route_new->failed = true;
698 random_ifaceid(struct in6_addr *addr)
700 static bool initialized = false;
705 gettimeofday(&t, NULL);
706 seed = t.tv_sec ^ t.tv_usec ^ getpid();
710 addr->s6_addr32[2] = (uint32_t)mrand48();
711 addr->s6_addr32[3] = (uint32_t)mrand48();
715 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
717 /* get mac address */
718 uint8_t *macaddr = iface->l3_dev.dev->settings.macaddr;
719 uint8_t *ifaceid = addr->s6_addr + 8;
720 memcpy(ifaceid,macaddr,3);
721 memcpy(ifaceid + 5,macaddr + 3, 3);
728 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
730 /* generate new iface id */
731 switch (iface->assignment_iface_id_selection) {
734 /* copy host part from assignment_fixed_iface_id */
735 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
738 /* randomize last 64 bits */
739 random_ifaceid(addr);
743 eui64_ifaceid(iface, addr);
749 interface_set_prefix_address(struct device_prefix_assignment *assignment,
750 const struct device_prefix *prefix, struct interface *iface, bool add)
752 const struct interface *uplink = prefix->iface;
753 if (!iface->l3_dev.dev)
756 struct device *l3_downlink = iface->l3_dev.dev;
758 struct device_addr addr;
759 struct device_route route;
760 memset(&addr, 0, sizeof(addr));
761 memset(&route, 0, sizeof(route));
763 if (IN6_IS_ADDR_UNSPECIFIED(&assignment->addr)) {
764 addr.addr.in6 = prefix->addr;
765 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
766 generate_ifaceid(iface, &addr.addr.in6);
767 assignment->addr = addr.addr.in6;
770 addr.addr.in6 = assignment->addr;
772 addr.mask = assignment->length;
773 addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
774 addr.preferred_until = prefix->preferred_until;
775 addr.valid_until = prefix->valid_until;
777 route.flags = DEVADDR_INET6;
778 route.mask = addr.mask < 64 ? 64 : addr.mask;
779 route.addr = addr.addr;
780 clear_if_addr(&route.addr, route.mask);
781 interface_set_route_info(iface, &route);
783 if (!add && assignment->enabled) {
784 time_t now = system_get_rtime();
785 addr.preferred_until = now;
786 if (!addr.valid_until || addr.valid_until - now > 7200)
787 addr.valid_until = now + 7200;
790 if (prefix->iface->ip6table)
791 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
792 addr.mask, prefix->iface->ip6table, iface, NULL, true);
794 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
795 addr.mask, 0, iface, "unreachable", true);
798 system_del_route(l3_downlink, &route);
799 system_add_address(l3_downlink, &addr);
801 assignment->enabled = false;
802 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
803 !system_add_address(l3_downlink, &addr)) {
805 if (prefix->iface && !assignment->enabled) {
806 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
807 addr.mask, 0, iface, "unreachable", true);
809 if (prefix->iface->ip6table)
810 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
811 addr.mask, prefix->iface->ip6table, iface, NULL, true);
814 route.metric = iface->metric;
815 system_add_route(l3_downlink, &route);
817 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
818 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
819 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
821 if (mtu > 0 && mtu_old > mtu)
822 system_update_ipv6_mtu(l3_downlink, mtu);
825 assignment->enabled = true;
829 static bool interface_prefix_assign(struct list_head *list,
830 struct device_prefix_assignment *assign)
832 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
833 struct device_prefix_assignment *c;
834 list_for_each_entry(c, list, head) {
835 if (assign->assigned != -1) {
836 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
837 list_add_tail(&assign->head, &c->head);
840 } else if (assign->assigned == -1) {
841 current = (current + asize) & (~asize);
842 if (current + asize < c->assigned) {
843 assign->assigned = current;
844 list_add_tail(&assign->head, &c->head);
848 current = (c->assigned + (1 << (64 - c->length)));
854 * Sorting of assignment entries:
855 * Primary on assignment length: smallest assignment first
856 * Secondary on assignment weight: highest weight first
857 * Finally alphabetical order of interface names
859 static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
861 const struct device_prefix_assignment *a1 = k1, *a2 = k2;
863 if (a1->length != a2->length)
864 return a1->length - a2->length;
866 if (a1->weight != a2->weight)
867 return a2->weight - a1->weight;
869 return strcmp(a1->name, a2->name);
872 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
874 struct device_prefix_assignment *c;
875 struct interface *iface;
877 // Delete all assignments
878 while (!list_empty(&prefix->assignments)) {
879 c = list_first_entry(&prefix->assignments,
880 struct device_prefix_assignment, head);
881 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
882 interface_set_prefix_address(c, prefix, iface, false);
890 // End-of-assignment sentinel
891 c = malloc(sizeof(*c) + 1);
895 c->assigned = 1 << (64 - prefix->length);
898 c->addr = in6addr_any;
899 list_add(&c->head, &prefix->assignments);
902 if (prefix->excl_length > 0) {
903 const char name[] = "!excluded";
904 c = malloc(sizeof(*c) + sizeof(name));
906 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
907 ((1 << (64 - prefix->length)) - 1);
908 c->length = prefix->excl_length;
909 c->addr = in6addr_any;
910 memcpy(c->name, name, sizeof(name));
911 list_add(&c->head, &prefix->assignments);
915 bool assigned_any = false;
917 struct avl_node node;
919 struct avl_tree assign_later;
921 avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
923 vlist_for_each_element(&interfaces, iface, node) {
924 if (iface->assignment_length < 48 ||
925 iface->assignment_length > 64)
928 // Test whether there is a matching class
929 if (!list_empty(&iface->assignment_classes)) {
932 struct interface_assignment_class *c;
933 list_for_each_entry(c, &iface->assignment_classes, head) {
934 if (!strcmp(c->name, prefix->pclass)) {
944 size_t namelen = strlen(iface->name) + 1;
945 c = malloc(sizeof(*c) + namelen);
949 c->length = iface->assignment_length;
950 c->assigned = iface->assignment_hint;
951 c->weight = iface->assignment_weight;
952 c->addr = in6addr_any;
954 memcpy(c->name, iface->name, namelen);
956 // First process all custom assignments, put all others in later-list
957 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
958 if (c->assigned != -1) {
960 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
961 "of size %hhu for %s, trying other\n", c->length, c->name);
964 entry = calloc(1, sizeof(*entry));
969 avl_insert(&assign_later, &entry->node);
972 if (c->assigned != -1)
976 /* Then try to assign all other + failed custom assignments */
977 avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
978 bool assigned = false;
980 c = (struct device_prefix_assignment *)entry->node.key;
981 avl_delete(&assign_later, &entry->node);
984 assigned = interface_prefix_assign(&prefix->assignments, c);
985 } while (!assigned && ++c->length <= 64);
988 netifd_log_message(L_WARNING, "Failed to assign subprefix "
989 "of size %hhu for %s\n", c->length, c->name);
997 list_for_each_entry(c, &prefix->assignments, head)
998 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
999 interface_set_prefix_address(c, prefix, iface, true);
1002 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
1003 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
1007 void interface_refresh_assignments(bool hint)
1009 static bool refresh = false;
1010 if (!hint && refresh) {
1011 struct device_prefix *p;
1012 list_for_each_entry(p, &prefixes, head)
1013 interface_update_prefix_assignments(p, true);
1020 interface_update_prefix(struct vlist_tree *tree,
1021 struct vlist_node *node_new,
1022 struct vlist_node *node_old)
1024 struct device_prefix *prefix_old, *prefix_new;
1025 prefix_old = container_of(node_old, struct device_prefix, node);
1026 prefix_new = container_of(node_new, struct device_prefix, node);
1028 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
1029 if (tree && (!node_new || !node_old))
1030 ip->iface->updated |= IUF_PREFIX;
1032 struct device_route route;
1033 memset(&route, 0, sizeof(route));
1034 route.flags = DEVADDR_INET6;
1035 route.metric = INT32_MAX;
1036 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
1037 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
1040 struct device_prefix_assignment *c;
1041 struct interface *iface;
1043 if (node_old && node_new) {
1044 // Move assignments and refresh addresses to update valid times
1045 list_splice(&prefix_old->assignments, &prefix_new->assignments);
1047 list_for_each_entry(c, &prefix_new->assignments, head)
1048 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1049 interface_set_prefix_address(c, prefix_new, iface, true);
1050 } else if (node_new) {
1051 // Set null-route to avoid routing loops
1052 system_add_route(NULL, &route);
1054 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
1055 interface_update_prefix_assignments(prefix_new, true);
1056 } else if (node_old) {
1057 // Remove null-route
1058 interface_update_prefix_assignments(prefix_old, false);
1059 system_del_route(NULL, &route);
1063 if (prefix_old->head.next)
1064 list_del(&prefix_old->head);
1068 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1069 list_add(&prefix_new->head, &prefixes);
1073 struct device_prefix*
1074 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1075 uint8_t length, time_t valid_until, time_t preferred_until,
1076 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1079 pclass = (iface) ? iface->name : "local";
1081 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1085 prefix->length = length;
1086 prefix->addr = *addr;
1087 prefix->preferred_until = preferred_until;
1088 prefix->valid_until = valid_until;
1089 prefix->iface = iface;
1090 INIT_LIST_HEAD(&prefix->assignments);
1093 prefix->excl_addr = *excl_addr;
1094 prefix->excl_length = excl_length;
1097 strcpy(prefix->pclass, pclass);
1100 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1102 interface_update_prefix(NULL, &prefix->node, NULL);
1108 interface_ip_set_ula_prefix(const char *prefix)
1110 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1112 strncpy(buf, prefix, sizeof(buf) - 1);
1113 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1115 struct in6_addr addr;
1116 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1118 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1125 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1126 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1129 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1130 ula_prefix->length != length) {
1132 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1134 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1135 0, 0, NULL, 0, NULL);
1140 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1142 struct dns_server *s;
1144 s = calloc(1, sizeof(*s));
1149 if (inet_pton(s->af, str, &s->addr.in))
1153 if (inet_pton(s->af, str, &s->addr.in))
1160 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1161 s->af == AF_INET6 ? '6' : '4', str);
1162 vlist_simple_add(&ip->dns_servers, &s->node);
1166 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1168 struct blob_attr *cur;
1171 blobmsg_for_each_attr(cur, list, rem) {
1172 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1175 if (!blobmsg_check_attr(cur, NULL))
1178 interface_add_dns_server(ip, blobmsg_data(cur));
1183 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1185 struct dns_search_domain *s;
1186 int len = strlen(str);
1188 s = calloc(1, sizeof(*s) + len + 1);
1192 D(INTERFACE, "Add DNS search domain: %s\n", str);
1193 memcpy(s->name, str, len);
1194 vlist_simple_add(&ip->dns_search, &s->node);
1198 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1200 struct blob_attr *cur;
1203 blobmsg_for_each_attr(cur, list, rem) {
1204 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1207 if (!blobmsg_check_attr(cur, NULL))
1210 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1215 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1217 struct dns_server *s;
1218 struct dns_search_domain *d;
1220 char buf[INET6_ADDRSTRLEN];
1222 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1223 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1227 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1228 fprintf(f, "nameserver %s%%%s\n", str, dev);
1230 fprintf(f, "nameserver %s\n", str);
1233 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1234 fprintf(f, "search %s\n", d->name);
1238 /* Sorting of interface resolver entries : */
1239 /* Primary on interface dns_metric : lowest metric first */
1240 /* Secondary on interface metric : lowest metric first */
1241 /* Finally alphabetical order of interface names */
1242 static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
1244 const struct interface *iface1 = k1, *iface2 = k2;
1246 if (iface1->dns_metric != iface2->dns_metric)
1247 return iface1->dns_metric - iface2->dns_metric;
1249 if (iface1->metric != iface2->metric)
1250 return iface1->metric - iface2->metric;
1252 return strcmp(iface1->name, iface2->name);
1256 __interface_write_dns_entries(FILE *f)
1258 struct interface *iface;
1260 struct avl_node node;
1262 struct avl_tree resolv_conf_iface_entries;
1264 avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
1266 vlist_for_each_element(&interfaces, iface, node) {
1267 if (iface->state != IFS_UP)
1270 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1271 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1272 vlist_simple_empty(&iface->config_ip.dns_search) &&
1273 vlist_simple_empty(&iface->config_ip.dns_servers))
1276 entry = calloc(1, sizeof(*entry));
1280 entry->node.key = iface;
1281 avl_insert(&resolv_conf_iface_entries, &entry->node);
1284 avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
1285 iface = (struct interface *)entry->node.key;
1287 fprintf(f, "# Interface %s\n", iface->name);
1289 write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
1291 if (!iface->proto_ip.no_dns)
1292 write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
1295 avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
1300 interface_write_resolv_conf(void)
1302 char *path = alloca(strlen(resolv_conf) + 5);
1304 uint32_t crcold, crcnew;
1306 sprintf(path, "%s.tmp", resolv_conf);
1308 f = fopen(path, "w+");
1310 D(INTERFACE, "Failed to open %s for writing\n", path);
1314 __interface_write_dns_entries(f);
1318 crcnew = crc32_file(f);
1321 crcold = crcnew + 1;
1322 f = fopen(resolv_conf, "r");
1324 crcold = crc32_file(f);
1328 if (crcold == crcnew) {
1330 } else if (rename(path, resolv_conf) < 0) {
1331 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1336 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1338 struct device_addr *addr;
1339 struct device_route *route;
1341 struct interface *iface;
1343 ip->enabled = enabled;
1345 dev = iface->l3_dev.dev;
1349 vlist_for_each_element(&ip->addr, addr, node) {
1350 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1352 if (addr->flags & DEVADDR_EXTERNAL)
1355 if (addr->enabled == enabled)
1359 system_add_address(dev, addr);
1361 addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1362 if (iface->metric || addr->policy_table)
1363 interface_handle_subnet_route(iface, addr, true);
1365 if (addr->policy_table)
1366 interface_add_addr_rules(addr, true);
1368 interface_handle_subnet_route(iface, addr, false);
1369 system_del_address(dev, addr);
1371 if (addr->policy_table)
1372 interface_add_addr_rules(addr, false);
1374 addr->enabled = enabled;
1377 vlist_for_each_element(&ip->route, route, node) {
1378 bool _enabled = enabled;
1380 if (route->flags & DEVADDR_EXTERNAL)
1383 if (!enable_route(ip, route))
1386 if (route->enabled == _enabled)
1390 interface_set_route_info(ip->iface, route);
1392 if (system_add_route(dev, route))
1393 route->failed = true;
1395 system_del_route(dev, route);
1396 route->enabled = _enabled;
1399 struct device_prefix *c;
1400 struct device_prefix_assignment *a;
1401 list_for_each_entry(c, &prefixes, head)
1402 list_for_each_entry(a, &c->assignments, head)
1403 if (!strcmp(a->name, ip->iface->name))
1404 interface_set_prefix_address(a, c, ip->iface, enabled);
1406 if (ip->iface && ip->iface->policy_rules_set != enabled &&
1407 ip->iface->l3_dev.dev) {
1408 set_ip_lo_policy(enabled, true, ip->iface);
1409 set_ip_lo_policy(enabled, false, ip->iface);
1411 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1412 NULL, 0, 0, ip->iface, "failed_policy", true);
1413 ip->iface->policy_rules_set = enabled;
1418 interface_ip_update_start(struct interface_ip_settings *ip)
1420 if (ip != &ip->iface->config_ip) {
1421 vlist_simple_update(&ip->dns_servers);
1422 vlist_simple_update(&ip->dns_search);
1424 vlist_update(&ip->route);
1425 vlist_update(&ip->addr);
1426 vlist_update(&ip->prefix);
1430 interface_ip_update_complete(struct interface_ip_settings *ip)
1432 vlist_simple_flush(&ip->dns_servers);
1433 vlist_simple_flush(&ip->dns_search);
1434 vlist_flush(&ip->route);
1435 vlist_flush(&ip->addr);
1436 vlist_flush(&ip->prefix);
1437 interface_write_resolv_conf();
1441 interface_ip_flush(struct interface_ip_settings *ip)
1443 if (ip == &ip->iface->proto_ip)
1444 vlist_flush_all(&ip->iface->host_routes);
1445 vlist_simple_flush_all(&ip->dns_servers);
1446 vlist_simple_flush_all(&ip->dns_search);
1447 vlist_flush_all(&ip->route);
1448 vlist_flush_all(&ip->addr);
1449 vlist_flush_all(&ip->prefix);
1453 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1457 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1458 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1459 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1460 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1461 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1465 interface_ip_init(struct interface *iface)
1467 __interface_ip_init(&iface->proto_ip, iface);
1468 __interface_ip_init(&iface->config_ip, iface);
1469 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1473 interface_ip_valid_until_handler(struct uloop_timeout *t)
1475 time_t now = system_get_rtime();
1476 struct interface *iface;
1477 vlist_for_each_element(&interfaces, iface, node) {
1478 if (iface->state != IFS_UP)
1481 struct device_addr *addr, *addrp;
1482 struct device_route *route, *routep;
1483 struct device_prefix *pref, *prefp;
1485 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1486 if (addr->valid_until && addr->valid_until < now)
1487 vlist_delete(&iface->proto_ip.addr, &addr->node);
1489 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1490 if (route->valid_until && route->valid_until < now)
1491 vlist_delete(&iface->proto_ip.route, &route->node);
1493 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1494 if (pref->valid_until && pref->valid_until < now)
1495 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1499 uloop_timeout_set(t, 1000);
1503 interface_ip_init_worker(void)
1505 valid_until_timeout.cb = interface_ip_valid_until_handler;
1506 uloop_timeout_set(&valid_until_timeout, 1000);