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