5 * Copyright (C) 2007-2012 Intel Corporation. All rights reserved.
6 * Copyright (C) 2011 ProFUSION embedded systems
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
28 #include <sys/types.h>
32 #include <sys/ioctl.h>
34 #include <linux/sockios.h>
37 #include <linux/if_tun.h>
38 #include <linux/if_bridge.h>
42 #include <gdhcp/gdhcp.h>
46 #ifndef DBUS_TYPE_UNIX_FD
47 #define DBUS_TYPE_UNIX_FD -1
50 #define BRIDGE_NAME "tether"
51 #define BRIDGE_DNS "8.8.8.8"
53 #define DEFAULT_MTU 1500
55 #define PRIVATE_NETWORK_PRIMARY_DNS BRIDGE_DNS
56 #define PRIVATE_NETWORK_SECONDARY_DNS "8.8.4.4"
58 static volatile int tethering_enabled;
59 static GDHCPServer *tethering_dhcp_server = NULL;
60 static struct connman_ippool *dhcp_ippool = NULL;
61 static DBusConnection *connection;
62 static GHashTable *pn_hash;
64 struct connman_private_network {
74 struct connman_ippool *pool;
75 const char *primary_dns;
76 const char *secondary_dns;
79 const char *__connman_tethering_get_bridge(void)
82 unsigned long args[3];
84 sk = socket(AF_INET, SOCK_STREAM, 0);
88 args[0] = BRCTL_GET_VERSION;
89 args[1] = args[2] = 0;
90 err = ioctl(sk, SIOCGIFBR, &args);
93 connman_error("Missing support for 802.1d ethernet bridging");
100 static void dhcp_server_debug(const char *str, void *data)
102 connman_info("%s: %s\n", (const char *) data, str);
105 static void dhcp_server_error(GDHCPServerError error)
108 case G_DHCP_SERVER_ERROR_NONE:
111 case G_DHCP_SERVER_ERROR_INTERFACE_UNAVAILABLE:
112 connman_error("Interface unavailable");
114 case G_DHCP_SERVER_ERROR_INTERFACE_IN_USE:
115 connman_error("Interface in use");
117 case G_DHCP_SERVER_ERROR_INTERFACE_DOWN:
118 connman_error("Interface down");
120 case G_DHCP_SERVER_ERROR_NOMEM:
121 connman_error("No memory");
123 case G_DHCP_SERVER_ERROR_INVALID_INDEX:
124 connman_error("Invalid index");
126 case G_DHCP_SERVER_ERROR_INVALID_OPTION:
127 connman_error("Invalid option");
129 case G_DHCP_SERVER_ERROR_IP_ADDRESS_INVALID:
130 connman_error("Invalid address");
135 static GDHCPServer *dhcp_server_start(const char *bridge,
136 const char *router, const char* subnet,
137 const char *start_ip, const char *end_ip,
138 unsigned int lease_time, const char *dns)
140 GDHCPServerError error;
141 GDHCPServer *dhcp_server;
146 index = connman_inet_ifindex(bridge);
150 dhcp_server = g_dhcp_server_new(G_DHCP_IPV4, index, &error);
151 if (dhcp_server == NULL) {
152 dhcp_server_error(error);
156 g_dhcp_server_set_debug(dhcp_server, dhcp_server_debug, "DHCP server");
158 g_dhcp_server_set_lease_time(dhcp_server, lease_time);
159 g_dhcp_server_set_option(dhcp_server, G_DHCP_SUBNET, subnet);
160 g_dhcp_server_set_option(dhcp_server, G_DHCP_ROUTER, router);
161 g_dhcp_server_set_option(dhcp_server, G_DHCP_DNS_SERVER, dns);
162 g_dhcp_server_set_ip_range(dhcp_server, start_ip, end_ip);
164 g_dhcp_server_start(dhcp_server);
169 static void dhcp_server_stop(GDHCPServer *server)
174 g_dhcp_server_unref(server);
177 static void tethering_restart(struct connman_ippool *pool, void *user_data)
179 __connman_tethering_set_disabled();
180 __connman_tethering_set_enabled();
183 void __connman_tethering_set_enabled(void)
188 const char *broadcast;
189 const char *subnet_mask;
190 const char *start_ip;
193 unsigned char prefixlen;
195 DBG("enabled %d", tethering_enabled + 1);
197 if (__sync_fetch_and_add(&tethering_enabled, 1) != 0)
200 err = __connman_bridge_create(BRIDGE_NAME);
202 __sync_fetch_and_sub(&tethering_enabled, 1);
206 index = connman_inet_ifindex(BRIDGE_NAME);
207 dhcp_ippool = __connman_ippool_create(index, 2, 252,
208 tethering_restart, NULL);
209 if (dhcp_ippool == NULL) {
210 connman_error("Fail to create IP pool");
211 __connman_bridge_remove(BRIDGE_NAME);
212 __sync_fetch_and_sub(&tethering_enabled, 1);
216 gateway = __connman_ippool_get_gateway(dhcp_ippool);
217 broadcast = __connman_ippool_get_broadcast(dhcp_ippool);
218 subnet_mask = __connman_ippool_get_subnet_mask(dhcp_ippool);
219 start_ip = __connman_ippool_get_start_ip(dhcp_ippool);
220 end_ip = __connman_ippool_get_end_ip(dhcp_ippool);
222 err = __connman_bridge_enable(BRIDGE_NAME, gateway, broadcast);
223 if (err < 0 && err != -EALREADY) {
224 __connman_ippool_unref(dhcp_ippool);
225 __connman_bridge_remove(BRIDGE_NAME);
226 __sync_fetch_and_sub(&tethering_enabled, 1);
231 if (__connman_dnsproxy_add_listener(index) < 0) {
232 connman_error("Can't add listener %s to DNS proxy",
237 tethering_dhcp_server = dhcp_server_start(BRIDGE_NAME,
238 gateway, subnet_mask,
241 if (tethering_dhcp_server == NULL) {
242 __connman_bridge_disable(BRIDGE_NAME);
243 __connman_ippool_unref(dhcp_ippool);
244 __connman_bridge_remove(BRIDGE_NAME);
245 __sync_fetch_and_sub(&tethering_enabled, 1);
250 __connman_ipaddress_netmask_prefix_len(subnet_mask);
251 __connman_nat_enable(BRIDGE_NAME, start_ip, prefixlen);
253 DBG("tethering started");
256 void __connman_tethering_set_disabled(void)
260 DBG("enabled %d", tethering_enabled - 1);
262 index = connman_inet_ifindex(BRIDGE_NAME);
263 __connman_dnsproxy_remove_listener(index);
265 if (__sync_fetch_and_sub(&tethering_enabled, 1) != 1)
268 __connman_nat_disable(BRIDGE_NAME);
270 dhcp_server_stop(tethering_dhcp_server);
272 tethering_dhcp_server = NULL;
274 __connman_bridge_disable(BRIDGE_NAME);
276 __connman_ippool_unref(dhcp_ippool);
278 __connman_bridge_remove(BRIDGE_NAME);
280 DBG("tethering stopped");
283 static void setup_tun_interface(unsigned int flags, unsigned change,
286 struct connman_private_network *pn = data;
287 unsigned char prefixlen;
288 DBusMessageIter array, dict;
289 const char *server_ip;
291 const char *subnet_mask;
294 DBG("index %d flags %d change %d", pn->index, flags, change);
299 subnet_mask = __connman_ippool_get_subnet_mask(pn->pool);
300 server_ip = __connman_ippool_get_start_ip(pn->pool);
301 peer_ip = __connman_ippool_get_end_ip(pn->pool);
303 __connman_ipaddress_netmask_prefix_len(subnet_mask);
305 if ((__connman_inet_modify_address(RTM_NEWADDR,
306 NLM_F_REPLACE | NLM_F_ACK, pn->index, AF_INET,
307 server_ip, peer_ip, prefixlen, NULL)) < 0) {
308 DBG("address setting failed");
312 connman_inet_ifup(pn->index);
314 err = __connman_nat_enable(BRIDGE_NAME, server_ip, prefixlen);
316 connman_error("failed to enable NAT");
320 dbus_message_iter_init_append(pn->reply, &array);
322 dbus_message_iter_append_basic(&array, DBUS_TYPE_OBJECT_PATH,
325 connman_dbus_dict_open(&array, &dict);
327 connman_dbus_dict_append_basic(&dict, "ServerIPv4",
328 DBUS_TYPE_STRING, &server_ip);
329 connman_dbus_dict_append_basic(&dict, "PeerIPv4",
330 DBUS_TYPE_STRING, &peer_ip);
331 connman_dbus_dict_append_basic(&dict, "PrimaryDNS",
332 DBUS_TYPE_STRING, &pn->primary_dns);
333 connman_dbus_dict_append_basic(&dict, "SecondaryDNS",
334 DBUS_TYPE_STRING, &pn->secondary_dns);
336 connman_dbus_dict_close(&array, &dict);
338 dbus_message_iter_append_basic(&array, DBUS_TYPE_UNIX_FD, &pn->fd);
340 g_dbus_send_message(connection, pn->reply);
345 pn->reply = __connman_error_failed(pn->msg, -err);
346 g_dbus_send_message(connection, pn->reply);
348 g_hash_table_remove(pn_hash, pn->path);
351 static void remove_private_network(gpointer user_data)
353 struct connman_private_network *pn = user_data;
355 __connman_nat_disable(BRIDGE_NAME);
356 connman_rtnl_remove_watch(pn->iface_watch);
357 __connman_ippool_unref(pn->pool);
360 g_dbus_remove_watch(connection, pn->watch);
366 g_free(pn->interface);
372 static void owner_disconnect(DBusConnection *conn, void *user_data)
374 struct connman_private_network *pn = user_data;
376 DBG("%s died", pn->owner);
380 g_hash_table_remove(pn_hash, pn->path);
383 static void ippool_disconnect(struct connman_ippool *pool, void *user_data)
385 struct connman_private_network *pn = user_data;
387 DBG("block used externally");
389 g_hash_table_remove(pn_hash, pn->path);
392 int __connman_private_network_request(DBusMessage *msg, const char *owner)
394 struct connman_private_network *pn;
399 if (DBUS_TYPE_UNIX_FD < 0)
402 fd = connman_inet_create_tunnel(&iface);
406 path = g_strdup_printf("/tethering/%s", iface);
408 pn = g_hash_table_lookup(pn_hash, path);
416 index = connman_inet_ifindex(iface);
421 DBG("interface %s", iface);
423 err = connman_inet_set_mtu(index, DEFAULT_MTU);
425 pn = g_try_new0(struct connman_private_network, 1);
431 pn->owner = g_strdup(owner);
433 pn->watch = g_dbus_add_disconnect_watch(connection, pn->owner,
434 owner_disconnect, pn, NULL);
436 pn->reply = dbus_message_new_method_return(pn->msg);
437 if (pn->reply == NULL)
441 pn->interface = iface;
443 pn->pool = __connman_ippool_create(pn->index, 1, 1, ippool_disconnect, pn);
444 if (pn->pool == NULL) {
449 pn->primary_dns = PRIVATE_NETWORK_PRIMARY_DNS;
450 pn->secondary_dns = PRIVATE_NETWORK_SECONDARY_DNS;
452 pn->iface_watch = connman_rtnl_add_newlink_watch(index,
453 setup_tun_interface, pn);
455 g_hash_table_insert(pn_hash, pn->path, pn);
467 int __connman_private_network_release(const char *path)
469 struct connman_private_network *pn;
471 pn = g_hash_table_lookup(pn_hash, path);
475 g_hash_table_remove(pn_hash, path);
479 int __connman_tethering_init(void)
483 tethering_enabled = 0;
485 connection = connman_dbus_get_connection();
486 if (connection == NULL)
489 pn_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
490 NULL, remove_private_network);
495 void __connman_tethering_cleanup(void)
499 __sync_synchronize();
500 if (tethering_enabled == 0) {
501 if (tethering_dhcp_server)
502 dhcp_server_stop(tethering_dhcp_server);
503 __connman_bridge_disable(BRIDGE_NAME);
504 __connman_bridge_remove(BRIDGE_NAME);
505 __connman_nat_disable(BRIDGE_NAME);
508 if (connection == NULL)
511 g_hash_table_destroy(pn_hash);
512 dbus_connection_unref(connection);