src/connection.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2010  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <net/if.h>
  27
  28 #include <gdbus.h>
  29
  30 #include "connman.h"
  31
  32 struct gateway_data {
  33         int index;
  34         char *gateway;
  35         struct connman_element *element;
  36         unsigned int order;
  37         gboolean active;
  38         /* VPN extra data */
  39         gboolean vpn;
  40         char *vpn_ip;
  41         int vpn_phy_index;
  42 };
  43
  44 static GSList *gateway_list = NULL;
  45
  46 static struct gateway_data *find_gateway(int index, const char *gateway)
  47 {
  48         GSList *list;
  49
  50         if (gateway == NULL)
  51                 return NULL;
  52
  53         for (list = gateway_list; list; list = list->next) {
  54                 struct gateway_data *data = list->data;
  55
  56                 if (data->gateway == NULL)
  57                         continue;
  58
  59                 if (data->index == index &&
  60                                 g_str_equal(data->gateway, gateway) == TRUE)
  61                         return data;
  62         }
  63
  64         return NULL;
  65 }
  66
  67 static int del_routes(struct gateway_data *data)
  68 {
  69         const char *address;
  70
  71         if (data->vpn) {
  72                 if (data->vpn_phy_index >= 0)
  73                         connman_inet_del_host_route(data->vpn_phy_index,
  74                                                         data->gateway);
  75                 address = data->vpn_ip;
  76         } else {
  77                 connman_inet_del_host_route(data->index, data->gateway);
  78                 address = data->gateway;
  79         }
  80         return connman_inet_clear_gateway_address(data->index, address);
  81 }
  82
  83 static void find_element(struct connman_element *element, gpointer user_data)
  84 {
  85         struct gateway_data *data = user_data;
  86
  87         DBG("element %p name %s", element, element->name);
  88
  89         if (data->element != NULL)
  90                 return;
  91
  92         if (element->index != data->index)
  93                 return;
  94
  95         data->element = element;
  96 }
  97
  98 static struct gateway_data *add_gateway(int index, const char *gateway)
  99 {
 100         struct gateway_data *data;
 101         struct connman_service *service;
 102
 103         data = g_try_new0(struct gateway_data, 1);
 104         if (data == NULL)
 105                 return NULL;
 106
 107         data->index = index;
 108         data->gateway = g_strdup(gateway);
 109         data->active = FALSE;
 110         data->element = NULL;
 111         data->vpn_ip = NULL;
 112         data->vpn = FALSE;
 113         data->vpn_phy_index = -1;
 114
 115         __connman_element_foreach(NULL, CONNMAN_ELEMENT_TYPE_CONNECTION,
 116                                                         find_element, data);
 117
 118         service = __connman_element_get_service(data->element);
 119         data->order = __connman_service_get_order(service);
 120
 121         gateway_list = g_slist_append(gateway_list, data);
 122
 123         return data;
 124 }
 125
 126 static void connection_newgateway(int index, const char *gateway)
 127 {
 128         struct gateway_data *data;
 129
 130         DBG("index %d gateway %s", index, gateway);
 131
 132         data = find_gateway(index, gateway);
 133         if (data == NULL)
 134                 return;
 135
 136         data->active = TRUE;
 137 }
 138
 139 static void set_default_gateway(struct gateway_data *data)
 140 {
 141         struct connman_element *element = data->element;
 142         struct connman_service *service = NULL;
 143         short int ifflags;
 144
 145         DBG("gateway %s", data->gateway);
 146
 147         if (data->vpn == TRUE) {
 148                 connman_inet_set_gateway_address(data->index, data->vpn_ip);
 149                 data->active = TRUE;
 150                 /* vpn gateway going away no changes in services */
 151                 return;
 152         }
 153
 154         ifflags = connman_inet_ifflags(element->index);
 155         if (ifflags < 0) {
 156                 connman_error("Fail to get network interface flags");
 157                 return;
 158         }
 159
 160         if (ifflags & IFF_POINTOPOINT) {
 161                 if (connman_inet_set_gateway_interface(element->index) < 0)
 162                         return;
 163                 goto done;
 164         }
 165
 166         connman_inet_add_host_route(element->index, data->gateway);
 167
 168         if (connman_inet_set_gateway_address(element->index, data->gateway) < 0)
 169                 return;
 170
 171 done:
 172         service = __connman_element_get_service(element);
 173         __connman_service_indicate_default(service);
 174 }
 175
 176 static struct gateway_data *find_default_gateway(void)
 177 {
 178         struct gateway_data *found = NULL;
 179         unsigned int order = 0;
 180         GSList *list;
 181
 182         for (list = gateway_list; list; list = list->next) {
 183                 struct gateway_data *data = list->data;
 184
 185                 if (found == NULL || data->order > order) {
 186                         found = data;
 187                         order = data->order;
 188                 }
 189         }
 190
 191         return found;
 192 }
 193
 194 static void remove_gateway(struct gateway_data *data)
 195 {
 196         DBG("gateway %s", data->gateway);
 197
 198         gateway_list = g_slist_remove(gateway_list, data);
 199
 200         if (data->active == TRUE)
 201                 del_routes(data);
 202
 203         g_free(data->gateway);
 204         g_free(data->vpn_ip);
 205         g_free(data);
 206 }
 207
 208 static void connection_delgateway(int index, const char *gateway)
 209 {
 210         struct gateway_data *data;
 211
 212         DBG("index %d gateway %s", index, gateway);
 213
 214         data = find_gateway(index, gateway);
 215         if (data != NULL)
 216                 data->active = FALSE;
 217
 218         data = find_default_gateway();
 219         if (data != NULL)
 220                 set_default_gateway(data);
 221 }
 222
 223 static struct connman_rtnl connection_rtnl = {
 224         .name           = "connection",
 225         .newgateway     = connection_newgateway,
 226         .delgateway     = connection_delgateway,
 227 };
 228
 229 static struct gateway_data *find_active_gateway(void)
 230 {
 231         GSList *list;
 232
 233         DBG("");
 234
 235         for (list = gateway_list; list; list = list->next) {
 236                 struct gateway_data *data = list->data;
 237                 if (data->active == TRUE)
 238                         return data;
 239         }
 240
 241         return NULL;
 242 }
 243
 244 static int connection_probe(struct connman_element *element)
 245 {
 246         struct connman_service *service = NULL;
 247         const char *gateway = NULL;
 248         const char *vpn_ip = NULL;
 249         struct gateway_data *active_gateway = NULL;
 250         struct gateway_data *new_gateway = NULL;
 251
 252         DBG("element %p name %s", element, element->name);
 253
 254         if (element->parent == NULL)
 255                 return -ENODEV;
 256
 257         /* FIXME: Remove temporarily for the static gateway support */
 258         /* if (element->parent->type != CONNMAN_ELEMENT_TYPE_IPV4)
 259                 return -ENODEV; */
 260
 261         connman_element_get_value(element,
 262                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 263
 264         connman_element_get_value(element,
 265                                   CONNMAN_PROPERTY_ID_IPV4_ADDRESS, &vpn_ip);
 266
 267         DBG("gateway %s", gateway);
 268
 269         service = __connman_element_get_service(element);
 270         __connman_service_indicate_state(service,
 271                                         CONNMAN_SERVICE_STATE_READY);
 272
 273         connman_element_set_enabled(element, TRUE);
 274
 275         if (gateway == NULL)
 276                 return 0;
 277
 278         active_gateway = find_active_gateway();
 279         new_gateway = add_gateway(element->index, gateway);
 280
 281         if (service == NULL) {
 282                 new_gateway->vpn = TRUE;
 283                 new_gateway->vpn_ip = g_strdup(vpn_ip);
 284                 /* make sure vpn gateway are at higher priority */
 285                 new_gateway->order = 10;
 286                 if (active_gateway)
 287                         new_gateway->vpn_phy_index = active_gateway->index;
 288         } else
 289                 new_gateway->vpn = FALSE;
 290
 291         if (active_gateway == NULL) {
 292                 set_default_gateway(new_gateway);
 293                 return 0;
 294         }
 295
 296         if (new_gateway->vpn == TRUE) {
 297                 connman_inet_add_host_route_vpn(active_gateway->index,
 298                                                 active_gateway->gateway,
 299                                                 new_gateway->gateway);
 300         }
 301
 302         if (new_gateway->order >= active_gateway->order) {
 303                 del_routes(active_gateway);
 304                 return 0;
 305         }
 306
 307         return 0;
 308 }
 309
 310 static void connection_remove(struct connman_element *element)
 311 {
 312         struct connman_service *service;
 313         const char *gateway = NULL;
 314         struct gateway_data *data = NULL;
 315         gboolean set_default = FALSE;
 316
 317         DBG("element %p name %s", element, element->name);
 318
 319         service = __connman_element_get_service(element);
 320         __connman_service_indicate_state(service,
 321                                         CONNMAN_SERVICE_STATE_DISCONNECT);
 322
 323         connman_element_set_enabled(element, FALSE);
 324
 325         connman_element_get_value(element,
 326                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 327
 328         DBG("gateway %s", gateway);
 329
 330         if (gateway == NULL)
 331                 return;
 332
 333         data = find_gateway(element->index, gateway);
 334         if (data == NULL)
 335                 return;
 336
 337         set_default = data->vpn;
 338
 339         if (data->vpn == TRUE && data->vpn_phy_index >= 0)
 340                 connman_inet_del_host_route(data->vpn_phy_index, data->gateway);
 341
 342         remove_gateway(data);
 343
 344         /* with vpn this will be called after the network was deleted,
 345          * we need to call set_default here because we will not recieve any
 346          * gateway delete notification.
 347          */
 348         if (set_default) {
 349                 data = find_default_gateway();
 350                 if (data != NULL)
 351                         set_default_gateway(data);
 352         }
 353 }
 354
 355 static struct connman_driver connection_driver = {
 356         .name           = "connection",
 357         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 358         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 359         .probe          = connection_probe,
 360         .remove         = connection_remove,
 361 };
 362
 363 int __connman_connection_init(void)
 364 {
 365         DBG("");
 366
 367         if (connman_rtnl_register(&connection_rtnl) < 0)
 368                 connman_error("Failed to setup RTNL gateway driver");
 369
 370         return connman_driver_register(&connection_driver);
 371 }
 372
 373 void __connman_connection_cleanup(void)
 374 {
 375         GSList *list;
 376
 377         DBG("");
 378
 379         connman_driver_unregister(&connection_driver);
 380
 381         connman_rtnl_unregister(&connection_rtnl);
 382
 383         for (list = gateway_list; list; list = list->next) {
 384                 struct gateway_data *data = list->data;
 385
 386                 DBG("index %d gateway %s", data->index, data->gateway);
 387
 388                 g_free(data->gateway);
 389                 g_free(data);
 390                 list->data = NULL;
 391         }
 392
 393         g_slist_free(gateway_list);
 394         gateway_list = NULL;
 395 }
 396
 397 static void update_order(void)
 398 {
 399         GSList *list = NULL;
 400
 401         for (list = gateway_list; list; list = list->next) {
 402                 struct gateway_data *data = list->data;
 403                 struct connman_service *service;
 404
 405                 /* vpn gataway is not attached to a service. */
 406                 if (data->vpn)
 407                         continue;
 408
 409                 service = __connman_element_get_service(data->element);
 410                 data->order = __connman_service_get_order(service);
 411         }
 412 }
 413
 414 gboolean __connman_connection_update_gateway(void)
 415 {
 416         struct gateway_data *active_gateway, *default_gateway;
 417         gboolean updated = FALSE;
 418
 419         update_order();
 420
 421         active_gateway = find_active_gateway();
 422         default_gateway = find_default_gateway();
 423
 424         if (active_gateway && active_gateway != default_gateway) {
 425                 del_routes(active_gateway);
 426                 updated = TRUE;
 427         }
 428
 429         return updated;
 430 }