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- /*
- * netifd - network interface daemon
- * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2012 Steven Barth <steven@midlink.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #include <string.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <limits.h>
- #include <arpa/inet.h>
- #include <netinet/in.h>
- #include "netifd.h"
- #include "device.h"
- #include "interface.h"
- #include "interface-ip.h"
- #include "proto.h"
- #include "ubus.h"
- #include "system.h"
- enum {
- ROUTE_INTERFACE,
- ROUTE_TARGET,
- ROUTE_MASK,
- ROUTE_GATEWAY,
- ROUTE_METRIC,
- ROUTE_MTU,
- ROUTE_VALID,
- ROUTE_TABLE,
- ROUTE_SOURCE,
- ROUTE_ONLINK,
- ROUTE_TYPE,
- ROUTE_PROTO,
- __ROUTE_MAX
- };
- static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
- [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
- [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
- [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
- [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
- [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
- [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
- [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
- [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
- [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
- [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
- [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
- [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
- };
- const struct uci_blob_param_list route_attr_list = {
- .n_params = __ROUTE_MAX,
- .params = route_attr,
- };
- struct list_head prefixes = LIST_HEAD_INIT(prefixes);
- static struct device_prefix *ula_prefix = NULL;
- static struct uloop_timeout valid_until_timeout;
- static void
- clear_if_addr(union if_addr *a, int mask)
- {
- int m_bytes = (mask + 7) / 8;
- uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
- uint8_t *p = (uint8_t *) a;
- if (m_bytes < sizeof(*a))
- memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
- p[m_bytes - 1] &= ~m_clear;
- }
- static bool
- match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
- {
- union if_addr *p1, *p2;
- p1 = alloca(sizeof(*a1));
- p2 = alloca(sizeof(*a2));
- memcpy(p1, a1, sizeof(*a1));
- clear_if_addr(p1, mask);
- memcpy(p2, a2, sizeof(*a2));
- clear_if_addr(p2, mask);
- return !memcmp(p1, p2, sizeof(*p1));
- }
- static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
- const union if_addr *addr, uint8_t mask, unsigned int table,
- struct interface *in_iface, const char *action, bool src)
- {
- struct iprule rule = {
- .flags = IPRULE_PRIORITY,
- .priority = priority
- };
- if (addr) {
- if (src) {
- rule.flags |= IPRULE_SRC;
- rule.src_addr = *addr;
- rule.src_mask = mask;
- } else {
- rule.flags |= IPRULE_DEST;
- rule.dest_addr = *addr;
- rule.dest_mask = mask;
- }
- }
- if (table) {
- rule.flags |= IPRULE_LOOKUP;
- rule.lookup = table;
- if (!rule.lookup)
- return 0;
- } else if (action) {
- rule.flags |= IPRULE_ACTION;
- system_resolve_iprule_action(action, &rule.action);
- }
- if (in_iface && in_iface->l3_dev.dev) {
- rule.flags |= IPRULE_IN;
- strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
- }
- rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
- return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
- }
- static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
- {
- struct iprule rule = {
- .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
- .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
- .lookup = (v6) ? iface->ip6table : iface->ip4table,
- .in_dev = "lo"
- };
- if (!rule.lookup)
- return 0;
- rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
- return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
- }
- static bool
- __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
- {
- struct device_addr *addr;
- vlist_for_each_element(&ip->addr, addr, node) {
- if (!addr->enabled)
- continue;
- if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
- continue;
- /* Handle offlink addresses correctly */
- unsigned int mask = addr->mask;
- if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
- (addr->flags & DEVADDR_OFFLINK))
- mask = 128;
- if (!match_if_addr(&addr->addr, a, mask))
- continue;
- return true;
- }
- return false;
- }
- static void
- __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
- bool v6, struct device_route **res)
- {
- struct device_route *route;
- vlist_for_each_element(&ip->route, route, node) {
- if (!route->enabled)
- continue;
- if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
- continue;
- if (!match_if_addr(&route->addr, a, route->mask))
- continue;
- if (route->flags & DEVROUTE_TABLE)
- continue;
- if (!*res || route->mask > (*res)->mask)
- *res = route;
- }
- }
- static bool
- interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
- {
- return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
- __find_ip_addr_target(&iface->config_ip, a, v6);
- }
- static void
- interface_ip_find_route_target(struct interface *iface, union if_addr *a,
- bool v6, struct device_route **route)
- {
- __find_ip_route_target(&iface->proto_ip, a, v6, route);
- __find_ip_route_target(&iface->config_ip, a, v6, route);
- }
- struct interface *
- interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
- {
- struct device_route *route, *r_next = NULL;
- bool defaultroute_target = false;
- union if_addr addr_zero;
- int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
- memset(&addr_zero, 0, sizeof(addr_zero));
- if (memcmp(&addr_zero, addr, addrsize) == 0)
- defaultroute_target = true;
- if (iface) {
- /* look for locally addressable target first */
- if (interface_ip_find_addr_target(iface, addr, v6))
- return iface;
- /* do not stop at the first route, let the lookup compare
- * masks to find the best match */
- interface_ip_find_route_target(iface, addr, v6, &r_next);
- } else {
- vlist_for_each_element(&interfaces, iface, node) {
- /* look for locally addressable target first */
- if (interface_ip_find_addr_target(iface, addr, v6))
- return iface;
- /* do not stop at the first route, let the lookup compare
- * masks to find the best match */
- interface_ip_find_route_target(iface, addr, v6, &r_next);
- }
- }
- if (!r_next)
- return NULL;
- iface = r_next->iface;
- if (defaultroute_target)
- return iface;
- route = calloc(1, sizeof(*route));
- if (!route)
- return NULL;
- route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
- route->mask = v6 ? 128 : 32;
- memcpy(&route->addr, addr, addrsize);
- memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
- route->mtu = r_next->mtu;
- route->metric = r_next->metric;
- route->table = r_next->table;
- route->iface = iface;
- vlist_add(&iface->host_routes, &route->node, route);
- return iface;
- }
- static void
- interface_set_route_info(struct interface *iface, struct device_route *route)
- {
- bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
- if (!iface)
- return;
- if (!(route->flags & DEVROUTE_METRIC))
- route->metric = iface->metric;
- if (!(route->flags & DEVROUTE_TABLE)) {
- route->table = (v6) ? iface->ip6table : iface->ip4table;
- if (route->table)
- route->flags |= DEVROUTE_SRCTABLE;
- }
- }
- void
- interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
- {
- struct interface_ip_settings *ip;
- struct blob_attr *tb[__ROUTE_MAX], *cur;
- struct device_route *route;
- int af = v6 ? AF_INET6 : AF_INET;
- blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
- if (!iface) {
- if ((cur = tb[ROUTE_INTERFACE]) == NULL)
- return;
- iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
- if (!iface)
- return;
- ip = &iface->config_ip;
- } else {
- ip = &iface->proto_ip;
- }
- route = calloc(1, sizeof(*route));
- if (!route)
- return;
- route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
- route->mask = v6 ? 128 : 32;
- if ((cur = tb[ROUTE_MASK]) != NULL) {
- route->mask = parse_netmask_string(blobmsg_data(cur), v6);
- if (route->mask > (v6 ? 128 : 32))
- goto error;
- }
- if ((cur = tb[ROUTE_TARGET]) != NULL) {
- if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
- DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
- goto error;
- }
- }
- if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
- if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
- DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
- goto error;
- }
- }
- if ((cur = tb[ROUTE_METRIC]) != NULL) {
- route->metric = blobmsg_get_u32(cur);
- route->flags |= DEVROUTE_METRIC;
- }
- if ((cur = tb[ROUTE_MTU]) != NULL) {
- route->mtu = blobmsg_get_u32(cur);
- route->flags |= DEVROUTE_MTU;
- }
- /* Use source-based routing */
- if ((cur = tb[ROUTE_SOURCE]) != NULL) {
- char *saveptr, *source = alloca(blobmsg_data_len(cur));
- memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
- const char *addr = strtok_r(source, "/", &saveptr);
- const char *mask = strtok_r(NULL, "/", &saveptr);
- if (!addr || inet_pton(af, addr, &route->source) < 1) {
- DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
- goto error;
- }
- route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
- }
- if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
- route->flags |= DEVROUTE_ONLINK;
- if ((cur = tb[ROUTE_TABLE]) != NULL) {
- if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
- DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
- goto error;
- }
- /* only set the table flag if not using the main (default) table */
- if (system_is_default_rt_table(route->table))
- route->table = 0;
- if (route->table)
- route->flags |= DEVROUTE_TABLE;
- }
- if ((cur = tb[ROUTE_VALID]) != NULL) {
- int64_t valid = blobmsg_get_u32(cur);
- int64_t valid_until = valid + (int64_t)system_get_rtime();
- if (valid_until <= LONG_MAX && valid != 0xffffffffLL) /* Catch overflow */
- route->valid_until = valid_until;
- }
- if ((cur = tb[ROUTE_TYPE]) != NULL) {
- if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
- DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
- goto error;
- }
- route->flags |= DEVROUTE_TYPE;
- }
- if ((cur = tb[ROUTE_PROTO]) != NULL) {
- if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
- DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
- goto error;
- }
- route->flags |= DEVROUTE_PROTO;
- }
- interface_set_route_info(iface, route);
- vlist_add(&ip->route, &route->node, route);
- return;
- error:
- free(route);
- }
- static int
- addr_cmp(const void *k1, const void *k2, void *ptr)
- {
- return memcmp(k1, k2, sizeof(struct device_addr) -
- offsetof(struct device_addr, flags));
- }
- static int
- route_cmp(const void *k1, const void *k2, void *ptr)
- {
- const struct device_route *r1 = k1, *r2 = k2;
- if (r1->mask != r2->mask)
- return r2->mask - r1->mask;
- if (r1->metric != r2->metric)
- return r1->metric - r2->metric;
- if (r1->flags != r2->flags)
- return r2->flags - r1->flags;
- if (r1->sourcemask != r2->sourcemask)
- return r1->sourcemask - r2->sourcemask;
- if (r1->table != r2->table)
- return r1->table - r2->table;
- int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
- if (maskcmp)
- return maskcmp;
- return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
- }
- static int
- prefix_cmp(const void *k1, const void *k2, void *ptr)
- {
- return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
- offsetof(struct device_prefix, addr));
- }
- static void
- interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
- {
- struct device *dev = iface->l3_dev.dev;
- struct device_route *r = &addr->subnet;
- if (addr->flags & DEVADDR_OFFLINK)
- return;
- if (!add) {
- if (!addr->subnet.iface)
- return;
- system_del_route(dev, r);
- memset(r, 0, sizeof(*r));
- return;
- }
- r->iface = iface;
- r->flags = addr->flags;
- r->mask = addr->mask;
- memcpy(&r->addr, &addr->addr, sizeof(r->addr));
- clear_if_addr(&r->addr, r->mask);
- if (!system_resolve_rt_proto("kernel", &r->proto))
- return;
- r->flags |= DEVROUTE_PROTO;
- system_del_route(dev, r);
- r->flags &= ~DEVROUTE_PROTO;
- interface_set_route_info(iface, r);
- system_add_route(dev, r);
- }
- static void
- interface_add_addr_rules(struct device_addr *addr, bool enabled)
- {
- bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
- set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
- (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
- true);
- set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
- &addr->addr, addr->mask, addr->policy_table, NULL,
- NULL, false);
- }
- static void
- interface_update_proto_addr(struct vlist_tree *tree,
- struct vlist_node *node_new,
- struct vlist_node *node_old)
- {
- struct interface_ip_settings *ip;
- struct interface *iface;
- struct device *dev;
- struct device_addr *a_new = NULL, *a_old = NULL;
- bool replace = false;
- bool keep = false;
- bool v6 = false;
- ip = container_of(tree, struct interface_ip_settings, addr);
- iface = ip->iface;
- dev = iface->l3_dev.dev;
- if (!node_new || !node_old)
- iface->updated |= IUF_ADDRESS;
- if (node_new) {
- a_new = container_of(node_new, struct device_addr, node);
- if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
- !a_new->broadcast) {
- /* /31 and /32 addressing need 255.255.255.255
- * as broadcast address. */
- if (a_new->mask >= 31) {
- a_new->broadcast = (uint32_t) ~0;
- } else {
- uint32_t mask = ~0;
- uint32_t *a = (uint32_t *) &a_new->addr;
- mask >>= a_new->mask;
- a_new->broadcast = *a | htonl(mask);
- }
- }
- }
- if (node_old)
- a_old = container_of(node_old, struct device_addr, node);
- if (a_new && a_old) {
- keep = true;
- if (a_old->flags != a_new->flags || a_old->failed)
- keep = false;
- if (a_old->valid_until != a_new->valid_until ||
- a_old->preferred_until != a_new->preferred_until)
- replace = true;
- if (((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
- (a_new->broadcast != a_old->broadcast ||
- a_new->point_to_point != a_old->point_to_point))
- keep = false;
- }
- if (node_old) {
- if (a_old->enabled && !keep) {
- /*
- * This is needed for source routing to work correctly. If a device
- * has two connections to a network using the same subnet, adding
- * only the network-rule will cause packets to be routed through the
- * first matching network (source IP matches both masks)
- */
- if (a_old->policy_table)
- interface_add_addr_rules(a_old, false);
- if (!(a_old->flags & DEVADDR_EXTERNAL)) {
- interface_handle_subnet_route(iface, a_old, false);
- system_del_address(dev, a_old);
- }
- }
- free(a_old->pclass);
- free(a_old);
- }
- if (node_new) {
- a_new->enabled = true;
- if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
- v6 = true;
- a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
- if (!keep || replace) {
- if (!(a_new->flags & DEVADDR_EXTERNAL)) {
- if (system_add_address(dev, a_new))
- a_new->failed = true;
- if (iface->metric || a_new->policy_table)
- interface_handle_subnet_route(iface, a_new, true);
- }
- if (!keep) {
- if (a_new->policy_table)
- interface_add_addr_rules(a_new, true);
- }
- }
- }
- }
- static bool
- enable_route(struct interface_ip_settings *ip, struct device_route *route)
- {
- if (ip->no_defaultroute && !route->mask)
- return false;
- return ip->enabled;
- }
- static void
- interface_update_proto_route(struct vlist_tree *tree,
- struct vlist_node *node_new,
- struct vlist_node *node_old)
- {
- struct interface_ip_settings *ip;
- struct interface *iface;
- struct device *dev;
- struct device_route *route_old, *route_new;
- bool keep = false;
- ip = container_of(tree, struct interface_ip_settings, route);
- iface = ip->iface;
- dev = iface->l3_dev.dev;
- if (!node_new || !node_old)
- iface->updated |= IUF_ROUTE;
- route_old = container_of(node_old, struct device_route, node);
- route_new = container_of(node_new, struct device_route, node);
- if (node_old && node_new)
- keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
- (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
- (route_old->proto == route_new->proto) && !route_old->failed;
- if (node_old) {
- if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
- system_del_route(dev, route_old);
- free(route_old);
- }
- if (node_new) {
- bool _enabled = enable_route(ip, route_new);
- if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
- if (system_add_route(dev, route_new))
- route_new->failed = true;
- route_new->iface = iface;
- route_new->enabled = _enabled;
- }
- }
- static void
- interface_update_host_route(struct vlist_tree *tree,
- struct vlist_node *node_new,
- struct vlist_node *node_old)
- {
- struct interface *iface;
- struct device *dev;
- struct device_route *route_old, *route_new;
- iface = container_of(tree, struct interface, host_routes);
- dev = iface->l3_dev.dev;
- route_old = container_of(node_old, struct device_route, node);
- route_new = container_of(node_new, struct device_route, node);
- if (node_old) {
- system_del_route(dev, route_old);
- free(route_old);
- }
- if (node_new) {
- if (system_add_route(dev, route_new))
- route_new->failed = true;
- }
- }
- static void
- random_ifaceid(struct in6_addr *addr)
- {
- static bool initialized = false;
- struct timeval t;
- if (!initialized) {
- long int seed = 0;
- gettimeofday(&t, NULL);
- seed = t.tv_sec ^ t.tv_usec ^ getpid();
- srand48(seed);
- initialized = true;
- }
- addr->s6_addr32[2] = (uint32_t)mrand48();
- addr->s6_addr32[3] = (uint32_t)mrand48();
- }
- static bool
- eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
- {
- struct device_settings st;
- device_merge_settings(iface->l3_dev.dev, &st);
- if (!(st.flags & DEV_OPT_MACADDR))
- return false;
- /* get mac address */
- uint8_t *ifaceid = addr->s6_addr + 8;
- memcpy(ifaceid, st.macaddr, 3);
- memcpy(ifaceid + 5, st.macaddr + 3, 3);
- ifaceid[3] = 0xff;
- ifaceid[4] = 0xfe;
- ifaceid[0] ^= 0x02;
- return true;
- }
- static bool
- generate_ifaceid(struct interface *iface, struct in6_addr *addr)
- {
- bool ret = true;
- /* generate new iface id */
- switch (iface->assignment_iface_id_selection) {
- case IFID_FIXED:
- /* fixed */
- /* copy host part from assignment_fixed_iface_id */
- memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
- break;
- case IFID_RANDOM:
- /* randomize last 64 bits */
- random_ifaceid(addr);
- break;
- case IFID_EUI64:
- /* eui64 */
- ret = eui64_ifaceid(iface, addr);
- break;
- default:
- ret = false;
- break;
- }
- return ret;
- }
- static void
- interface_set_prefix_address(struct device_prefix_assignment *assignment,
- const struct device_prefix *prefix, struct interface *iface, bool add)
- {
- const struct interface *uplink = prefix->iface;
- if (!iface->l3_dev.dev)
- return;
- struct device *l3_downlink = iface->l3_dev.dev;
- struct device_addr addr;
- struct device_route route;
- memset(&addr, 0, sizeof(addr));
- memset(&route, 0, sizeof(route));
- addr.addr.in6 = assignment->addr;
- addr.mask = assignment->length;
- addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
- addr.preferred_until = prefix->preferred_until;
- addr.valid_until = prefix->valid_until;
- route.flags = DEVADDR_INET6;
- route.mask = addr.mask < 64 ? 64 : addr.mask;
- route.addr = addr.addr;
- if (!add && assignment->enabled) {
- time_t now = system_get_rtime();
- addr.preferred_until = now;
- if (!addr.valid_until || addr.valid_until - now > 7200)
- addr.valid_until = now + 7200;
- if (iface->ip6table)
- set_ip_source_policy(false, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
- addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
- if (prefix->iface) {
- if (prefix->iface->ip6table)
- set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
- addr.mask, prefix->iface->ip6table, iface, NULL, true);
- set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
- addr.mask, 0, iface, "unreachable", true);
- }
- clear_if_addr(&route.addr, route.mask);
- interface_set_route_info(iface, &route);
- system_del_route(l3_downlink, &route);
- system_add_address(l3_downlink, &addr);
- assignment->addr = in6addr_any;
- assignment->enabled = false;
- } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
- if (IN6_IS_ADDR_UNSPECIFIED(&addr.addr.in6)) {
- addr.addr.in6 = prefix->addr;
- addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
- if (!generate_ifaceid(iface, &addr.addr.in6))
- return;
- assignment->addr = addr.addr.in6;
- route.addr = addr.addr;
- }
- if (system_add_address(l3_downlink, &addr))
- return;
- if (!assignment->enabled) {
- if (iface->ip6table)
- set_ip_source_policy(true, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
- addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
- if (prefix->iface) {
- set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
- addr.mask, 0, iface, "unreachable", true);
- if (prefix->iface->ip6table)
- set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
- addr.mask, prefix->iface->ip6table, iface, NULL, true);
- }
- }
- clear_if_addr(&route.addr, route.mask);
- interface_set_route_info(iface, &route);
- system_add_route(l3_downlink, &route);
- if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
- int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
- int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
- if (mtu > 0 && mtu_old != mtu) {
- if (system_update_ipv6_mtu(l3_downlink, mtu) < 0)
- netifd_log_message(L_WARNING, "Failed to set IPv6 mtu to %d"
- "on interface '%s'\n", mtu, iface->name);
- }
- }
- assignment->enabled = true;
- }
- }
- static bool interface_prefix_assign(struct list_head *list,
- struct device_prefix_assignment *assign)
- {
- int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
- struct device_prefix_assignment *c;
- list_for_each_entry(c, list, head) {
- if (assign->assigned != -1) {
- if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
- list_add_tail(&assign->head, &c->head);
- return true;
- }
- } else if (assign->assigned == -1) {
- current = (current + asize) & (~asize);
- if (current + asize < c->assigned) {
- assign->assigned = current;
- list_add_tail(&assign->head, &c->head);
- return true;
- }
- }
- current = (c->assigned + (1 << (64 - c->length)));
- }
- return false;
- }
- /*
- * Sorting of assignment entries:
- * Primary on assignment length: smallest assignment first
- * Secondary on assignment weight: highest weight first
- * Finally alphabetical order of interface names
- */
- static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
- {
- const struct device_prefix_assignment *a1 = k1, *a2 = k2;
- if (a1->length != a2->length)
- return a1->length - a2->length;
- if (a1->weight != a2->weight)
- return a2->weight - a1->weight;
- return strcmp(a1->name, a2->name);
- }
- static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
- {
- struct device_prefix_assignment *c;
- struct interface *iface;
- /* Delete all assignments */
- while (!list_empty(&prefix->assignments)) {
- c = list_first_entry(&prefix->assignments,
- struct device_prefix_assignment, head);
- if ((iface = vlist_find(&interfaces, c->name, iface, node)))
- interface_set_prefix_address(c, prefix, iface, false);
- list_del(&c->head);
- free(c);
- }
- if (!setup)
- return;
- /* End-of-assignment sentinel */
- c = malloc(sizeof(*c) + 1);
- if (!c)
- return;
- c->assigned = 1 << (64 - prefix->length);
- c->length = 64;
- c->name[0] = 0;
- c->addr = in6addr_any;
- list_add(&c->head, &prefix->assignments);
- /* Excluded prefix */
- if (prefix->excl_length > 0) {
- const char name[] = "!excluded";
- c = malloc(sizeof(*c) + sizeof(name));
- if (c) {
- c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
- ((1 << (64 - prefix->length)) - 1);
- c->length = prefix->excl_length;
- c->addr = in6addr_any;
- memcpy(c->name, name, sizeof(name));
- list_add(&c->head, &prefix->assignments);
- }
- }
- bool assigned_any = false;
- struct {
- struct avl_node node;
- } *entry, *n_entry;
- struct avl_tree assign_later;
- avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
- vlist_for_each_element(&interfaces, iface, node) {
- if (iface->assignment_length < 48 ||
- iface->assignment_length > 64)
- continue;
- /* Test whether there is a matching class */
- if (!list_empty(&iface->assignment_classes)) {
- bool found = false;
- struct interface_assignment_class *c;
- list_for_each_entry(c, &iface->assignment_classes, head) {
- if (!strcmp(c->name, prefix->pclass)) {
- found = true;
- break;
- }
- }
- if (!found)
- continue;
- }
- size_t namelen = strlen(iface->name) + 1;
- c = malloc(sizeof(*c) + namelen);
- if (!c)
- continue;
- c->length = iface->assignment_length;
- c->assigned = iface->assignment_hint;
- c->weight = iface->assignment_weight;
- c->addr = in6addr_any;
- c->enabled = false;
- memcpy(c->name, iface->name, namelen);
- /* First process all custom assignments, put all others in later-list */
- if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
- if (c->assigned != -1) {
- c->assigned = -1;
- netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
- "of size %hhu for %s, trying other\n", c->length, c->name);
- }
- entry = calloc(1, sizeof(*entry));
- if (!entry) {
- free(c);
- continue;
- }
- entry->node.key = c;
- avl_insert(&assign_later, &entry->node);
- }
- if (c->assigned != -1)
- assigned_any = true;
- }
- /* Then try to assign all other + failed custom assignments */
- avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
- bool assigned = false;
- c = (struct device_prefix_assignment *)entry->node.key;
- avl_delete(&assign_later, &entry->node);
- do {
- assigned = interface_prefix_assign(&prefix->assignments, c);
- } while (!assigned && ++c->length <= 64);
- if (!assigned) {
- netifd_log_message(L_WARNING, "Failed to assign subprefix "
- "of size %hhu for %s\n", c->length, c->name);
- free(c);
- } else
- assigned_any = true;
- free(entry);
- }
- list_for_each_entry(c, &prefix->assignments, head)
- if ((iface = vlist_find(&interfaces, c->name, iface, node)))
- interface_set_prefix_address(c, prefix, iface, true);
- if (!assigned_any)
- netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
- "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
- }
- void interface_refresh_assignments(bool hint)
- {
- static bool refresh = false;
- if (!hint && refresh) {
- struct device_prefix *p;
- list_for_each_entry(p, &prefixes, head)
- interface_update_prefix_assignments(p, true);
- }
- refresh = hint;
- }
- static void
- interface_update_prefix(struct vlist_tree *tree,
- struct vlist_node *node_new,
- struct vlist_node *node_old)
- {
- struct device_prefix *prefix_old, *prefix_new;
- prefix_old = container_of(node_old, struct device_prefix, node);
- prefix_new = container_of(node_new, struct device_prefix, node);
- struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
- if (tree && (!node_new || !node_old))
- ip->iface->updated |= IUF_PREFIX;
- struct device_route route;
- memset(&route, 0, sizeof(route));
- route.flags = DEVADDR_INET6;
- route.metric = INT32_MAX;
- route.mask = (node_new) ? prefix_new->length : prefix_old->length;
- route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
- struct device_prefix_assignment *c;
- struct interface *iface;
- if (node_old && node_new) {
- /* Move assignments and refresh addresses to update valid times */
- list_splice(&prefix_old->assignments, &prefix_new->assignments);
- list_for_each_entry(c, &prefix_new->assignments, head)
- if ((iface = vlist_find(&interfaces, c->name, iface, node)))
- interface_set_prefix_address(c, prefix_new, iface, true);
- if (prefix_new->preferred_until != prefix_old->preferred_until ||
- prefix_new->valid_until != prefix_old->valid_until)
- ip->iface->updated |= IUF_PREFIX;
- } else if (node_new) {
- /* Set null-route to avoid routing loops */
- system_add_route(NULL, &route);
- if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
- interface_update_prefix_assignments(prefix_new, true);
- } else if (node_old) {
- /* Remove null-route */
- interface_update_prefix_assignments(prefix_old, false);
- system_del_route(NULL, &route);
- }
- if (node_old) {
- if (prefix_old->head.next)
- list_del(&prefix_old->head);
- free(prefix_old);
- }
- if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
- list_add(&prefix_new->head, &prefixes);
- }
- struct device_prefix*
- interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
- uint8_t length, time_t valid_until, time_t preferred_until,
- struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
- {
- if (!pclass)
- pclass = (iface) ? iface->name : "local";
- struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
- if (!prefix)
- return NULL;
- prefix->length = length;
- prefix->addr = *addr;
- prefix->preferred_until = preferred_until;
- prefix->valid_until = valid_until;
- prefix->iface = iface;
- INIT_LIST_HEAD(&prefix->assignments);
- if (excl_addr) {
- prefix->excl_addr = *excl_addr;
- prefix->excl_length = excl_length;
- }
- strcpy(prefix->pclass, pclass);
- if (iface)
- vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
- else
- interface_update_prefix(NULL, &prefix->node, NULL);
- return prefix;
- }
- void
- interface_ip_set_ula_prefix(const char *prefix)
- {
- char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
- if (prefix)
- strncpy(buf, prefix, sizeof(buf) - 1);
- char *prefixaddr = strtok_r(buf, "/", &saveptr);
- struct in6_addr addr;
- if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
- if (ula_prefix) {
- interface_update_prefix(NULL, NULL, &ula_prefix->node);
- ula_prefix = NULL;
- }
- return;
- }
- int length;
- char *prefixlen = strtok_r(NULL, ",", &saveptr);
- if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
- return;
- if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
- ula_prefix->length != length) {
- if (ula_prefix)
- interface_update_prefix(NULL, NULL, &ula_prefix->node);
- ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
- 0, 0, NULL, 0, NULL);
- }
- }
- static void
- interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
- {
- struct dns_server *s;
- s = calloc(1, sizeof(*s));
- if (!s)
- return;
- s->af = AF_INET;
- if (inet_pton(s->af, str, &s->addr.in))
- goto add;
- s->af = AF_INET6;
- if (inet_pton(s->af, str, &s->addr.in))
- goto add;
- free(s);
- return;
- add:
- D(INTERFACE, "Add IPv%c DNS server: %s\n",
- s->af == AF_INET6 ? '6' : '4', str);
- vlist_simple_add(&ip->dns_servers, &s->node);
- }
- void
- interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
- {
- struct blob_attr *cur;
- int rem;
- blobmsg_for_each_attr(cur, list, rem) {
- if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
- continue;
- if (!blobmsg_check_attr(cur, NULL))
- continue;
- interface_add_dns_server(ip, blobmsg_data(cur));
- }
- }
- static void
- interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
- {
- struct dns_search_domain *s;
- int len = strlen(str);
- s = calloc(1, sizeof(*s) + len + 1);
- if (!s)
- return;
- D(INTERFACE, "Add DNS search domain: %s\n", str);
- memcpy(s->name, str, len);
- vlist_simple_add(&ip->dns_search, &s->node);
- }
- void
- interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
- {
- struct blob_attr *cur;
- int rem;
- blobmsg_for_each_attr(cur, list, rem) {
- if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
- continue;
- if (!blobmsg_check_attr(cur, NULL))
- continue;
- interface_add_dns_search_domain(ip, blobmsg_data(cur));
- }
- }
- static void
- write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
- {
- struct dns_server *s;
- struct dns_search_domain *d;
- const char *str;
- char buf[INET6_ADDRSTRLEN];
- vlist_simple_for_each_element(&ip->dns_servers, s, node) {
- str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
- if (!str)
- continue;
- if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
- fprintf(f, "nameserver %s%%%s\n", str, dev);
- else
- fprintf(f, "nameserver %s\n", str);
- }
- vlist_simple_for_each_element(&ip->dns_search, d, node) {
- fprintf(f, "search %s\n", d->name);
- }
- }
- /* Sorting of interface resolver entries : */
- /* Primary on interface dns_metric : lowest metric first */
- /* Secondary on interface metric : lowest metric first */
- /* Finally alphabetical order of interface names */
- static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
- {
- const struct interface *iface1 = k1, *iface2 = k2;
- if (iface1->dns_metric != iface2->dns_metric)
- return iface1->dns_metric - iface2->dns_metric;
- if (iface1->metric != iface2->metric)
- return iface1->metric - iface2->metric;
- return strcmp(iface1->name, iface2->name);
- }
- static void
- __interface_write_dns_entries(FILE *f)
- {
- struct interface *iface;
- struct {
- struct avl_node node;
- } *entry, *n_entry;
- struct avl_tree resolv_conf_iface_entries;
- avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
- vlist_for_each_element(&interfaces, iface, node) {
- if (iface->state != IFS_UP)
- continue;
- if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
- vlist_simple_empty(&iface->proto_ip.dns_servers) &&
- vlist_simple_empty(&iface->config_ip.dns_search) &&
- vlist_simple_empty(&iface->config_ip.dns_servers))
- continue;
- entry = calloc(1, sizeof(*entry));
- if (!entry)
- continue;
- entry->node.key = iface;
- avl_insert(&resolv_conf_iface_entries, &entry->node);
- }
- avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
- iface = (struct interface *)entry->node.key;
- struct device *dev = iface->l3_dev.dev;
- fprintf(f, "# Interface %s\n", iface->name);
- write_resolv_conf_entries(f, &iface->config_ip, dev->ifname);
- if (!iface->proto_ip.no_dns)
- write_resolv_conf_entries(f, &iface->proto_ip, dev->ifname);
- }
- avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
- free(entry);
- }
- void
- interface_write_resolv_conf(void)
- {
- char *path = alloca(strlen(resolv_conf) + 5);
- FILE *f;
- uint32_t crcold, crcnew;
- sprintf(path, "%s.tmp", resolv_conf);
- unlink(path);
- f = fopen(path, "w+");
- if (!f) {
- D(INTERFACE, "Failed to open %s for writing\n", path);
- return;
- }
- __interface_write_dns_entries(f);
- fflush(f);
- rewind(f);
- crcnew = crc32_file(f);
- fclose(f);
- crcold = crcnew + 1;
- f = fopen(resolv_conf, "r");
- if (f) {
- crcold = crc32_file(f);
- fclose(f);
- }
- if (crcold == crcnew) {
- unlink(path);
- } else if (rename(path, resolv_conf) < 0) {
- D(INTERFACE, "Failed to replace %s\n", resolv_conf);
- unlink(path);
- }
- }
- void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
- {
- struct device_addr *addr;
- struct device_route *route;
- struct device *dev;
- struct interface *iface;
- ip->enabled = enabled;
- iface = ip->iface;
- dev = iface->l3_dev.dev;
- if (!dev)
- return;
- vlist_for_each_element(&ip->addr, addr, node) {
- bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
- if (addr->flags & DEVADDR_EXTERNAL)
- continue;
- if (addr->enabled == enabled)
- continue;
- if (enabled) {
- system_add_address(dev, addr);
- addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
- if (iface->metric || addr->policy_table)
- interface_handle_subnet_route(iface, addr, true);
- if (addr->policy_table)
- interface_add_addr_rules(addr, true);
- } else {
- interface_handle_subnet_route(iface, addr, false);
- system_del_address(dev, addr);
- if (addr->policy_table)
- interface_add_addr_rules(addr, false);
- }
- addr->enabled = enabled;
- }
- vlist_for_each_element(&ip->route, route, node) {
- bool _enabled = enabled;
- if (route->flags & DEVADDR_EXTERNAL)
- continue;
- if (!enable_route(ip, route))
- _enabled = false;
- if (route->enabled == _enabled)
- continue;
- if (_enabled) {
- interface_set_route_info(ip->iface, route);
- if (system_add_route(dev, route))
- route->failed = true;
- } else
- system_del_route(dev, route);
- route->enabled = _enabled;
- }
- struct device_prefix *c;
- struct device_prefix_assignment *a;
- list_for_each_entry(c, &prefixes, head)
- list_for_each_entry(a, &c->assignments, head)
- if (!strcmp(a->name, ip->iface->name))
- interface_set_prefix_address(a, c, ip->iface, enabled);
- if (ip->iface->policy_rules_set != enabled &&
- ip->iface->l3_dev.dev) {
- set_ip_lo_policy(enabled, true, ip->iface);
- set_ip_lo_policy(enabled, false, ip->iface);
- set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
- NULL, 0, 0, ip->iface, "failed_policy", true);
- ip->iface->policy_rules_set = enabled;
- }
- }
- void
- interface_ip_update_start(struct interface_ip_settings *ip)
- {
- if (ip != &ip->iface->config_ip) {
- vlist_simple_update(&ip->dns_servers);
- vlist_simple_update(&ip->dns_search);
- }
- vlist_update(&ip->route);
- vlist_update(&ip->addr);
- vlist_update(&ip->prefix);
- }
- void
- interface_ip_update_complete(struct interface_ip_settings *ip)
- {
- vlist_simple_flush(&ip->dns_servers);
- vlist_simple_flush(&ip->dns_search);
- vlist_flush(&ip->route);
- vlist_flush(&ip->addr);
- vlist_flush(&ip->prefix);
- interface_write_resolv_conf();
- }
- void
- interface_ip_flush(struct interface_ip_settings *ip)
- {
- if (ip == &ip->iface->proto_ip)
- vlist_flush_all(&ip->iface->host_routes);
- vlist_simple_flush_all(&ip->dns_servers);
- vlist_simple_flush_all(&ip->dns_search);
- vlist_flush_all(&ip->route);
- vlist_flush_all(&ip->addr);
- vlist_flush_all(&ip->prefix);
- }
- static void
- __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
- {
- ip->iface = iface;
- ip->enabled = true;
- vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
- vlist_simple_init(&ip->dns_servers, struct dns_server, node);
- vlist_init(&ip->route, route_cmp, interface_update_proto_route);
- vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
- vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
- }
- void
- interface_ip_init(struct interface *iface)
- {
- __interface_ip_init(&iface->proto_ip, iface);
- __interface_ip_init(&iface->config_ip, iface);
- vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
- }
- static void
- interface_ip_valid_until_handler(struct uloop_timeout *t)
- {
- time_t now = system_get_rtime();
- struct interface *iface;
- vlist_for_each_element(&interfaces, iface, node) {
- if (iface->state != IFS_UP)
- continue;
- struct device_addr *addr, *addrp;
- struct device_route *route, *routep;
- struct device_prefix *pref, *prefp;
- vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
- if (addr->valid_until && addr->valid_until < now)
- vlist_delete(&iface->proto_ip.addr, &addr->node);
- vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
- if (route->valid_until && route->valid_until < now)
- vlist_delete(&iface->proto_ip.route, &route->node);
- vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
- if (pref->valid_until && pref->valid_until < now)
- vlist_delete(&iface->proto_ip.prefix, &pref->node);
- }
- uloop_timeout_set(t, 1000);
- }
- static void __init
- interface_ip_init_worker(void)
- {
- valid_until_timeout.cb = interface_ip_valid_until_handler;
- uloop_timeout_set(&valid_until_timeout, 1000);
- }
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