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 <string.h>
  27 #include <net/if.h>
  28
  29 #include <gdbus.h>
  30
  31 #include "connman.h"
  32
  33 struct gateway_data {
  34         int index;
  35         char *gateway;
  36         struct connman_element *element;
  37         unsigned int order;
  38         gboolean active;
  39         /* VPN extra data */
  40         gboolean vpn;
  41         char *vpn_ip;
  42         int vpn_phy_index;
  43 };
  44
  45 static GSList *gateway_list = NULL;
  46
  47 static struct gateway_data *find_gateway(int index, const char *gateway)
  48 {
  49         GSList *list;
  50
  51         if (gateway == NULL)
  52                 return NULL;
  53
  54         for (list = gateway_list; list; list = list->next) {
  55                 struct gateway_data *data = list->data;
  56
  57                 if (data->gateway == NULL)
  58                         continue;
  59
  60                 if (data->index == index &&
  61                                 g_str_equal(data->gateway, gateway) == TRUE)
  62                         return data;
  63         }
  64
  65         return NULL;
  66 }
  67
  68 static int del_routes(struct gateway_data *data)
  69 {
  70         if (data->vpn) {
  71                 if (data->vpn_phy_index >= 0)
  72                         connman_inet_del_host_route(data->vpn_phy_index,
  73                                                         data->gateway);
  74                 return connman_inet_clear_gateway_address(data->index,
  75                                                         data->vpn_ip);
  76         } else if (g_strcmp0(data->gateway, "0.0.0.0") == 0) {
  77                 return connman_inet_clear_gateway_interface(data->index);
  78         } else {
  79                 connman_inet_del_host_route(data->index, data->gateway);
  80                 return connman_inet_clear_gateway_address(data->index,
  81                                                         data->gateway);
  82         }
  83 }
  84
  85 static void find_element(struct connman_element *element, gpointer user_data)
  86 {
  87         struct gateway_data *data = user_data;
  88
  89         DBG("element %p name %s", element, element->name);
  90
  91         if (data->element != NULL)
  92                 return;
  93
  94         if (element->index != data->index)
  95                 return;
  96
  97         data->element = element;
  98 }
  99
 100 static struct gateway_data *add_gateway(int index, const char *gateway)
 101 {
 102         struct gateway_data *data;
 103         struct connman_service *service;
 104
 105         if (strlen(gateway) == 0)
 106                 return NULL;
 107
 108         data = g_try_new0(struct gateway_data, 1);
 109         if (data == NULL)
 110                 return NULL;
 111
 112         data->index = index;
 113         data->gateway = g_strdup(gateway);
 114         data->active = FALSE;
 115         data->element = NULL;
 116         data->vpn_ip = NULL;
 117         data->vpn = FALSE;
 118         data->vpn_phy_index = -1;
 119
 120         __connman_element_foreach(NULL, CONNMAN_ELEMENT_TYPE_CONNECTION,
 121                                                         find_element, data);
 122
 123         service = __connman_element_get_service(data->element);
 124         data->order = __connman_service_get_order(service);
 125
 126         gateway_list = g_slist_append(gateway_list, data);
 127
 128         return data;
 129 }
 130
 131 static void connection_newgateway(int index, const char *gateway)
 132 {
 133         struct gateway_data *data;
 134
 135         DBG("index %d gateway %s", index, gateway);
 136
 137         data = find_gateway(index, gateway);
 138         if (data == NULL)
 139                 return;
 140
 141         data->active = TRUE;
 142 }
 143
 144 static void set_default_gateway(struct gateway_data *data)
 145 {
 146         struct connman_element *element = data->element;
 147         struct connman_service *service = NULL;
 148
 149         DBG("gateway %s", data->gateway);
 150
 151         if (data->vpn == TRUE) {
 152                 connman_inet_set_gateway_address(data->index, data->vpn_ip);
 153                 data->active = TRUE;
 154                 /* vpn gateway going away no changes in services */
 155                 return;
 156         }
 157
 158         if (g_strcmp0(data->gateway, "0.0.0.0") == 0) {
 159                 if (connman_inet_set_gateway_interface(element->index) < 0)
 160                         return;
 161                 goto done;
 162         }
 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 int remove_gateway(struct gateway_data *data)
 191 {
 192         int err;
 193
 194         DBG("gateway %s", data->gateway);
 195
 196         gateway_list = g_slist_remove(gateway_list, data);
 197
 198         if (data->active == TRUE)
 199                 err = del_routes(data);
 200         else
 201                 err = 0;
 202
 203         g_free(data->gateway);
 204         g_free(data->vpn_ip);
 205         g_free(data);
 206
 207         return err;
 208 }
 209
 210 static void connection_delgateway(int index, const char *gateway)
 211 {
 212         struct gateway_data *data;
 213
 214         DBG("index %d gateway %s", index, gateway);
 215
 216         data = find_gateway(index, gateway);
 217         if (data != NULL)
 218                 data->active = FALSE;
 219
 220         data = find_default_gateway();
 221         if (data != NULL)
 222                 set_default_gateway(data);
 223 }
 224
 225 static struct connman_rtnl connection_rtnl = {
 226         .name           = "connection",
 227         .newgateway     = connection_newgateway,
 228         .delgateway     = connection_delgateway,
 229 };
 230
 231 static struct gateway_data *find_active_gateway(void)
 232 {
 233         GSList *list;
 234
 235         DBG("");
 236
 237         for (list = gateway_list; list; list = list->next) {
 238                 struct gateway_data *data = list->data;
 239
 240                 if (data->active == TRUE)
 241                         return data;
 242         }
 243
 244         return NULL;
 245 }
 246
 247 static int connection_probe(struct connman_element *element)
 248 {
 249         struct connman_service *service = NULL;
 250         const char *gateway = NULL;
 251         const char *vpn_ip = NULL;
 252         struct gateway_data *active_gateway = NULL;
 253         struct gateway_data *new_gateway = NULL;
 254
 255         DBG("element %p name %s", element, element->name);
 256
 257         if (element->parent == NULL)
 258                 return -ENODEV;
 259
 260         /* FIXME: Remove temporarily for the static gateway support */
 261         /* if (element->parent->type != CONNMAN_ELEMENT_TYPE_IPV4)
 262                 return -ENODEV; */
 263
 264         connman_element_get_value(element,
 265                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 266
 267         connman_element_get_value(element,
 268                                   CONNMAN_PROPERTY_ID_IPV4_ADDRESS, &vpn_ip);
 269
 270         DBG("gateway %s", gateway);
 271
 272         /*
 273          * If gateway is NULL, it's a point to point link and the default
 274          * gateway is 0.0.0.0, meaning the interface.
 275          */
 276         if (gateway == NULL) {
 277                 gateway = "0.0.0.0";
 278                 element->ipv4.gateway = g_strdup(gateway);
 279         }
 280
 281         connman_element_set_enabled(element, TRUE);
 282
 283         active_gateway = find_active_gateway();
 284         new_gateway = add_gateway(element->index, gateway);
 285         if (new_gateway == NULL)
 286                 return 0;
 287
 288         service = __connman_element_get_service(element);
 289
 290         connman_inet_add_host_route(element->index,
 291                                         new_gateway->gateway, NULL);
 292         __connman_service_nameserver_add_routes(service,
 293                                                 new_gateway->gateway);
 294
 295         __connman_service_indicate_state(service, CONNMAN_SERVICE_STATE_READY);
 296
 297         if (service == NULL) {
 298                 new_gateway->vpn = TRUE;
 299                 new_gateway->vpn_ip = g_strdup(vpn_ip);
 300                 /* make sure vpn gateway are at higher priority */
 301                 new_gateway->order = 10;
 302                 if (active_gateway)
 303                         new_gateway->vpn_phy_index = active_gateway->index;
 304         } else
 305                 new_gateway->vpn = FALSE;
 306
 307         if (active_gateway == NULL) {
 308                 set_default_gateway(new_gateway);
 309                 return 0;
 310         }
 311
 312         if (new_gateway->vpn == TRUE) {
 313                 connman_inet_add_host_route(active_gateway->index,
 314                                                 new_gateway->gateway,
 315                                                 active_gateway->gateway);
 316         }
 317
 318         if (new_gateway->order >= active_gateway->order) {
 319                 del_routes(active_gateway);
 320                 return 0;
 321         }
 322
 323         return 0;
 324 }
 325
 326 static void connection_remove(struct connman_element *element)
 327 {
 328         struct connman_service *service;
 329         const char *gateway = NULL;
 330         struct gateway_data *data = NULL;
 331         gboolean set_default = FALSE;
 332         int err;
 333
 334         DBG("element %p name %s", element, element->name);
 335
 336         service = __connman_element_get_service(element);
 337         __connman_service_nameserver_del_routes(service);
 338         __connman_service_indicate_state(service,
 339                                         CONNMAN_SERVICE_STATE_DISCONNECT);
 340
 341         connman_element_set_enabled(element, FALSE);
 342
 343         connman_element_get_value(element,
 344                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 345
 346         DBG("gateway %s", gateway);
 347
 348         if (gateway == NULL)
 349                 return;
 350
 351         data = find_gateway(element->index, gateway);
 352         if (data == NULL)
 353                 return;
 354
 355         set_default = data->vpn;
 356
 357         if (data->vpn == TRUE && data->vpn_phy_index >= 0)
 358                 connman_inet_del_host_route(data->vpn_phy_index, data->gateway);
 359
 360         err = remove_gateway(data);
 361
 362         /* with vpn this will be called after the network was deleted,
 363          * we need to call set_default here because we will not recieve any
 364          * gateway delete notification.
 365          * We hit the same issue if remove_gateway() fails.
 366          */
 367         if (set_default || err < 0) {
 368                 data = find_default_gateway();
 369                 if (data != NULL)
 370                         set_default_gateway(data);
 371         }
 372 }
 373
 374 static struct connman_driver connection_driver = {
 375         .name           = "connection",
 376         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 377         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 378         .probe          = connection_probe,
 379         .remove         = connection_remove,
 380 };
 381
 382 int __connman_connection_init(void)
 383 {
 384         DBG("");
 385
 386         if (connman_rtnl_register(&connection_rtnl) < 0)
 387                 connman_error("Failed to setup RTNL gateway driver");
 388
 389         return connman_driver_register(&connection_driver);
 390 }
 391
 392 void __connman_connection_cleanup(void)
 393 {
 394         GSList *list;
 395
 396         DBG("");
 397
 398         connman_driver_unregister(&connection_driver);
 399
 400         connman_rtnl_unregister(&connection_rtnl);
 401
 402         for (list = gateway_list; list; list = list->next) {
 403                 struct gateway_data *data = list->data;
 404
 405                 DBG("index %d gateway %s", data->index, data->gateway);
 406
 407                 g_free(data->gateway);
 408                 g_free(data);
 409                 list->data = NULL;
 410         }
 411
 412         g_slist_free(gateway_list);
 413         gateway_list = NULL;
 414 }
 415
 416 static void update_order(void)
 417 {
 418         GSList *list = NULL;
 419
 420         for (list = gateway_list; list; list = list->next) {
 421                 struct gateway_data *data = list->data;
 422                 struct connman_service *service;
 423
 424                 /* vpn gataway is not attached to a service. */
 425                 if (data->vpn)
 426                         continue;
 427
 428                 service = __connman_element_get_service(data->element);
 429                 data->order = __connman_service_get_order(service);
 430         }
 431 }
 432
 433 gboolean __connman_connection_update_gateway(void)
 434 {
 435         struct gateway_data *active_gateway, *default_gateway;
 436         gboolean updated = FALSE;
 437
 438         update_order();
 439
 440         active_gateway = find_active_gateway();
 441         default_gateway = find_default_gateway();
 442
 443         if (active_gateway && active_gateway != default_gateway) {
 444                 del_routes(active_gateway);
 445                 updated = TRUE;
 446         }
 447
 448         return updated;
 449 }