+/*
+ * netifd - network interface daemon
+ * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.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 <unistd.h>
+
+#include <arpa/inet.h>
#include "netifd.h"
#include "device.h"
#include "interface.h"
+#include "interface-ip.h"
#include "proto.h"
#include "ubus.h"
#include "system.h"
-int interface_add_address(struct interface *iface, struct device_addr *addr)
+enum {
+ ROUTE_INTERFACE,
+ ROUTE_TARGET,
+ ROUTE_MASK,
+ ROUTE_GATEWAY,
+ ROUTE_METRIC,
+ ROUTE_MTU,
+ __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 },
+};
+
+const struct config_param_list route_attr_list = {
+ .n_params = __ROUTE_MAX,
+ .params = route_attr,
+};
+
+static void
+clear_if_addr(union if_addr *a, int mask)
{
- int family;
+ int m_bytes = (mask + 7) / 8;
+ uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
+ uint8_t *p = (uint8_t *) a;
- if (addr->flags & DEVADDR_INET6)
- family = AF_INET6;
- else
- family = AF_INET;
+ 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));
+}
- list_add(&addr->list, &iface->address);
- return system_add_address(iface->l3_iface->dev, addr);
+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;
+
+ if (!match_if_addr(&addr->addr, a, addr->mask))
+ continue;
+
+ return true;
+ }
+
+ return false;
}
-void interface_del_address(struct interface *iface, struct device_addr *addr)
+static void
+__find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
+ bool v6, struct device_route **res)
{
- int family;
+ struct device_route *route;
- if (addr->flags & DEVADDR_INET6)
- family = AF_INET6;
+ 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 (!*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;
+ int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
+
+ route = calloc(1, sizeof(*route));
+ if (!route)
+ return NULL;
+
+ route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
+ route->mask = v6 ? 128 : 32;
+ if (memcmp(&route->addr, addr, addrsize) == 0)
+ defaultroute_target = true;
else
- family = AF_INET;
+ memcpy(&route->addr, addr, addrsize);
+
+ vlist_for_each_element(&interfaces, iface, node) {
+ /* look for locally addressable target first */
+ if (interface_ip_find_addr_target(iface, addr, v6))
+ goto done;
+
+ /* 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) {
+ free(route);
+ return NULL;
+ }
+
+ iface = r_next->iface;
+ memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
+ route->mtu = r_next->mtu;
+ route->metric = r_next->metric;
- list_del(&addr->list);
- system_del_address(iface->l3_iface->dev, addr);
+done:
+ route->iface = iface;
+ if (defaultroute_target)
+ free(route);
+ else
+ vlist_add(&iface->host_routes, &route->node, &route->flags);
+ return iface;
}
-void interface_del_ctx_addr(struct interface *iface, void *ctx)
+void
+interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
{
- struct device_addr *addr, *tmp;
+ 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;
- list_for_each_entry_safe(addr, tmp, &iface->address, list) {
- if (ctx && addr->ctx != ctx)
+ 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;
+ }
+
+ vlist_add(&ip->route, &route->node, &route->flags);
+ 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)
+{
+ return memcmp(k1, k2, sizeof(struct device_route) -
+ offsetof(struct device_route, flags));
+}
+
+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 route;
+
+ memset(&route, 0, sizeof(route));
+ route.iface = iface;
+ route.flags = addr->flags;
+ route.mask = addr->mask;
+ memcpy(&route.addr, &addr->addr, sizeof(route.addr));
+ clear_if_addr(&route.addr, route.mask);
+
+ if (add) {
+ route.flags |= DEVADDR_KERNEL;
+ system_del_route(dev, &route);
+
+ route.flags &= ~DEVADDR_KERNEL;
+ route.metric = iface->metric;
+ system_add_route(dev, &route);
+ } else {
+ system_del_route(dev, &route);
+ }
+}
+
+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 keep = false;
+
+ ip = container_of(tree, struct interface_ip_settings, addr);
+ iface = ip->iface;
+ dev = iface->l3_dev.dev;
+
+ if (node_new) {
+ a_new = container_of(node_new, struct device_addr, node);
+
+ if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
+ !a_new->broadcast) {
+
+ 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)
+ keep = false;
+
+ if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
+ a_new->broadcast != a_old->broadcast)
+ keep = false;
+ }
+
+ if (node_old) {
+ if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
+ interface_handle_subnet_route(iface, a_old, false);
+ system_del_address(dev, a_old);
+ }
+ free(a_old);
+ }
+
+ if (node_new) {
+ a_new->enabled = true;
+ if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
+ system_add_address(dev, a_new);
+ if (iface->metric)
+ interface_handle_subnet_route(iface, 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;
+
+ 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));
+
+ 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 & DEVROUTE_METRIC))
+ route_new->metric = iface->metric;
+
+ if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
+ system_add_route(dev, route_new);
+
+ 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)
+ system_add_route(dev, route_new);
+}
+
+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)
+{
+ struct dns_server *s;
+ struct dns_search_domain *d;
+ const char *str;
+ char buf[32];
+
+ vlist_simple_for_each_element(&ip->dns_servers, s, node) {
+ str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
+ if (!str)
+ continue;
+
+ fprintf(f, "nameserver %s\n", str);
+ }
+
+ vlist_simple_for_each_element(&ip->dns_search, d, node) {
+ fprintf(f, "search %s\n", d->name);
+ }
+}
+
+void
+interface_write_resolv_conf(void)
+{
+ struct interface *iface;
+ char *path = alloca(strlen(resolv_conf) + 5);
+ FILE *f;
+
+ 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;
+ }
+
+ 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;
+
+ fprintf(f, "# Interface %s\n", iface->name);
+ write_resolv_conf_entries(f, &iface->config_ip);
+ if (!iface->proto_ip.no_dns)
+ write_resolv_conf_entries(f, &iface->proto_ip);
+ }
+ fclose(f);
+ 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;
+
+ ip->enabled = enabled;
+ dev = ip->iface->l3_dev.dev;
+ if (!dev)
+ return;
+
+ vlist_for_each_element(&ip->addr, addr, node) {
+ if (addr->enabled == enabled)
continue;
- interface_del_address(iface, addr);
+ if (enabled)
+ system_add_address(dev, addr);
+ else
+ system_del_address(dev, addr);
+ addr->enabled = enabled;
+ }
+
+ vlist_for_each_element(&ip->route, route, node) {
+ bool _enabled = enabled;
+
+ if (!enable_route(ip, route))
+ _enabled = false;
+
+ if (route->enabled == _enabled)
+ continue;
+
+ if (_enabled) {
+ if (!(route->flags & DEVROUTE_METRIC))
+ route->metric = ip->iface->metric;
+
+ system_add_route(dev, route);
+ } else
+ system_del_route(dev, route);
+ route->enabled = _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);
+}
+
+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);
+ 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);
+}
+
+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);
+}
+
+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);
}
projects / project / netifd.git / blobdiff