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 *ipv4_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->ipv4_gateway == NULL)
  58                         continue;
  59
  60                 if (data->index == index &&
  61                                 g_str_equal(data->ipv4_gateway, gateway)
  62                                                                 == TRUE)
  63                         return data;
  64         }
  65
  66         return NULL;
  67 }
  68
  69 static int del_routes(struct gateway_data *data)
  70 {
  71         if (data->vpn) {
  72                 if (data->vpn_phy_index >= 0)
  73                         connman_inet_del_host_route(data->vpn_phy_index,
  74                                                         data->ipv4_gateway);
  75                 return connman_inet_clear_gateway_address(data->index,
  76                                                         data->vpn_ip);
  77         } else if (g_strcmp0(data->ipv4_gateway, "0.0.0.0") == 0) {
  78                 return connman_inet_clear_gateway_interface(data->index);
  79         } else {
  80                 connman_inet_del_host_route(data->index, data->ipv4_gateway);
  81                 return connman_inet_clear_gateway_address(data->index,
  82                                                         data->ipv4_gateway);
  83         }
  84 }
  85
  86 static void find_element(struct connman_element *element, gpointer user_data)
  87 {
  88         struct gateway_data *data = user_data;
  89
  90         DBG("element %p name %s", element, element->name);
  91
  92         if (data->element != NULL)
  93                 return;
  94
  95         if (element->index != data->index)
  96                 return;
  97
  98         data->element = element;
  99 }
 100
 101 static struct gateway_data *add_gateway(int index, const char *gateway)
 102 {
 103         struct gateway_data *data;
 104         struct connman_service *service;
 105
 106         if (strlen(gateway) == 0)
 107                 return NULL;
 108
 109         data = g_try_new0(struct gateway_data, 1);
 110         if (data == NULL)
 111                 return NULL;
 112
 113         data->index = index;
 114         data->ipv4_gateway = g_strdup(gateway);
 115         data->active = FALSE;
 116         data->element = NULL;
 117         data->vpn_ip = NULL;
 118         data->vpn = FALSE;
 119         data->vpn_phy_index = -1;
 120
 121         __connman_element_foreach(NULL, CONNMAN_ELEMENT_TYPE_CONNECTION,
 122                                                         find_element, data);
 123
 124         service = __connman_element_get_service(data->element);
 125         data->order = __connman_service_get_order(service);
 126
 127         gateway_list = g_slist_append(gateway_list, data);
 128
 129         return data;
 130 }
 131
 132 static void connection_newgateway(int index, const char *gateway)
 133 {
 134         struct gateway_data *data;
 135
 136         DBG("index %d gateway %s", index, gateway);
 137
 138         data = find_gateway(index, gateway);
 139         if (data == NULL)
 140                 return;
 141
 142         data->active = TRUE;
 143 }
 144
 145 static void set_default_gateway(struct gateway_data *data)
 146 {
 147         struct connman_element *element = data->element;
 148         struct connman_service *service = NULL;
 149
 150         DBG("gateway %s", data->ipv4_gateway);
 151
 152         if (data->vpn == TRUE) {
 153                 connman_inet_set_gateway_address(data->index, data->vpn_ip);
 154                 data->active = TRUE;
 155                 /* vpn gateway going away no changes in services */
 156                 return;
 157         }
 158
 159         if (g_strcmp0(data->ipv4_gateway, "0.0.0.0") == 0) {
 160                 if (connman_inet_set_gateway_interface(element->index) < 0)
 161                         return;
 162                 goto done;
 163         }
 164
 165         if (connman_inet_set_gateway_address(element->index,
 166                                         data->ipv4_gateway) < 0)
 167                 return;
 168
 169 done:
 170         service = __connman_element_get_service(element);
 171         __connman_service_indicate_default(service);
 172 }
 173
 174 static struct gateway_data *find_default_gateway(void)
 175 {
 176         struct gateway_data *found = NULL;
 177         unsigned int order = 0;
 178         GSList *list;
 179
 180         for (list = gateway_list; list; list = list->next) {
 181                 struct gateway_data *data = list->data;
 182
 183                 if (found == NULL || data->order > order) {
 184                         found = data;
 185                         order = data->order;
 186                 }
 187         }
 188
 189         return found;
 190 }
 191
 192 static int remove_gateway(struct gateway_data *data)
 193 {
 194         int err;
 195
 196         DBG("gateway %s", data->ipv4_gateway);
 197
 198         gateway_list = g_slist_remove(gateway_list, data);
 199
 200         if (data->active == TRUE)
 201                 err = del_routes(data);
 202         else
 203                 err = 0;
 204
 205         g_free(data->ipv4_gateway);
 206         g_free(data->vpn_ip);
 207         g_free(data);
 208
 209         return err;
 210 }
 211
 212 static void connection_delgateway(int index, const char *gateway)
 213 {
 214         struct gateway_data *data;
 215
 216         DBG("index %d gateway %s", index, gateway);
 217
 218         data = find_gateway(index, gateway);
 219         if (data != NULL)
 220                 data->active = FALSE;
 221
 222         data = find_default_gateway();
 223         if (data != NULL)
 224                 set_default_gateway(data);
 225 }
 226
 227 static struct connman_rtnl connection_rtnl = {
 228         .name           = "connection",
 229         .newgateway     = connection_newgateway,
 230         .delgateway     = connection_delgateway,
 231 };
 232
 233 static struct gateway_data *find_active_gateway(void)
 234 {
 235         GSList *list;
 236
 237         DBG("");
 238
 239         for (list = gateway_list; list; list = list->next) {
 240                 struct gateway_data *data = list->data;
 241
 242                 if (data->active == TRUE)
 243                         return data;
 244         }
 245
 246         return NULL;
 247 }
 248
 249 static int connection_probe(struct connman_element *element)
 250 {
 251         struct connman_service *service = NULL;
 252         const char *gateway = NULL;
 253         const char *vpn_ip = NULL;
 254         struct gateway_data *active_gateway = NULL;
 255         struct gateway_data *new_gateway = NULL;
 256
 257         DBG("element %p name %s", element, element->name);
 258
 259         if (element->parent == NULL)
 260                 return -ENODEV;
 261
 262         /* FIXME: Remove temporarily for the static gateway support */
 263         /* if (element->parent->type != CONNMAN_ELEMENT_TYPE_IPV4)
 264                 return -ENODEV; */
 265
 266         connman_element_get_value(element,
 267                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 268
 269         connman_element_get_value(element,
 270                                   CONNMAN_PROPERTY_ID_IPV4_ADDRESS, &vpn_ip);
 271
 272         DBG("gateway %s", gateway);
 273
 274         /*
 275          * If gateway is NULL, it's a point to point link and the default
 276          * gateway is 0.0.0.0, meaning the interface.
 277          */
 278         if (gateway == NULL) {
 279                 gateway = "0.0.0.0";
 280                 element->ipv4.gateway = g_strdup(gateway);
 281         }
 282
 283         connman_element_set_enabled(element, TRUE);
 284
 285         active_gateway = find_active_gateway();
 286         new_gateway = add_gateway(element->index, gateway);
 287         if (new_gateway == NULL)
 288                 return 0;
 289
 290         service = __connman_element_get_service(element);
 291
 292         connman_inet_add_host_route(element->index,
 293                                         new_gateway->ipv4_gateway, NULL);
 294         __connman_service_nameserver_add_routes(service,
 295                                                 new_gateway->ipv4_gateway);
 296
 297         __connman_service_indicate_state(service, CONNMAN_SERVICE_STATE_READY);
 298
 299         if (service == NULL) {
 300                 new_gateway->vpn = TRUE;
 301                 new_gateway->vpn_ip = g_strdup(vpn_ip);
 302                 /* make sure vpn gateway are at higher priority */
 303                 new_gateway->order = 10;
 304                 if (active_gateway)
 305                         new_gateway->vpn_phy_index = active_gateway->index;
 306         } else
 307                 new_gateway->vpn = FALSE;
 308
 309         if (active_gateway == NULL) {
 310                 set_default_gateway(new_gateway);
 311                 return 0;
 312         }
 313
 314         if (new_gateway->vpn == TRUE) {
 315                 connman_inet_add_host_route(active_gateway->index,
 316                                                 new_gateway->ipv4_gateway,
 317                                                 active_gateway->ipv4_gateway);
 318         }
 319
 320         if (new_gateway->order >= active_gateway->order) {
 321                 del_routes(active_gateway);
 322                 return 0;
 323         }
 324
 325         return 0;
 326 }
 327
 328 static void connection_remove(struct connman_element *element)
 329 {
 330         struct connman_service *service;
 331         const char *gateway = NULL;
 332         struct gateway_data *data = NULL;
 333         gboolean set_default = FALSE;
 334         int err;
 335
 336         DBG("element %p name %s", element, element->name);
 337
 338         service = __connman_element_get_service(element);
 339         __connman_service_nameserver_del_routes(service);
 340         __connman_service_indicate_state(service,
 341                                         CONNMAN_SERVICE_STATE_DISCONNECT);
 342
 343         connman_element_set_enabled(element, FALSE);
 344
 345         connman_element_get_value(element,
 346                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 347
 348         DBG("gateway %s", gateway);
 349
 350         if (gateway == NULL)
 351                 return;
 352
 353         data = find_gateway(element->index, gateway);
 354         if (data == NULL)
 355                 return;
 356
 357         set_default = data->vpn;
 358
 359         if (data->vpn == TRUE && data->vpn_phy_index >= 0)
 360                 connman_inet_del_host_route(data->vpn_phy_index,
 361                                                 data->ipv4_gateway);
 362         err = remove_gateway(data);
 363
 364         /* with vpn this will be called after the network was deleted,
 365          * we need to call set_default here because we will not recieve any
 366          * gateway delete notification.
 367          * We hit the same issue if remove_gateway() fails.
 368          */
 369         if (set_default || err < 0) {
 370                 data = find_default_gateway();
 371                 if (data != NULL)
 372                         set_default_gateway(data);
 373         }
 374 }
 375
 376 static struct connman_driver connection_driver = {
 377         .name           = "connection",
 378         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 379         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 380         .probe          = connection_probe,
 381         .remove         = connection_remove,
 382 };
 383
 384 int __connman_connection_init(void)
 385 {
 386         DBG("");
 387
 388         if (connman_rtnl_register(&connection_rtnl) < 0)
 389                 connman_error("Failed to setup RTNL gateway driver");
 390
 391         return connman_driver_register(&connection_driver);
 392 }
 393
 394 void __connman_connection_cleanup(void)
 395 {
 396         GSList *list;
 397
 398         DBG("");
 399
 400         connman_driver_unregister(&connection_driver);
 401
 402         connman_rtnl_unregister(&connection_rtnl);
 403
 404         for (list = gateway_list; list; list = list->next) {
 405                 struct gateway_data *data = list->data;
 406
 407                 DBG("index %d gateway %s", data->index, data->ipv4_gateway);
 408
 409                 g_free(data->ipv4_gateway);
 410                 g_free(data);
 411                 list->data = NULL;
 412         }
 413
 414         g_slist_free(gateway_list);
 415         gateway_list = NULL;
 416 }
 417
 418 static void update_order(void)
 419 {
 420         GSList *list = NULL;
 421
 422         for (list = gateway_list; list; list = list->next) {
 423                 struct gateway_data *data = list->data;
 424                 struct connman_service *service;
 425
 426                 /* vpn gataway is not attached to a service. */
 427                 if (data->vpn)
 428                         continue;
 429
 430                 service = __connman_element_get_service(data->element);
 431                 data->order = __connman_service_get_order(service);
 432         }
 433 }
 434
 435 gboolean __connman_connection_update_gateway(void)
 436 {
 437         struct gateway_data *active_gateway, *default_gateway;
 438         gboolean updated = FALSE;
 439
 440         update_order();
 441
 442         active_gateway = find_active_gateway();
 443         default_gateway = find_default_gateway();
 444
 445         if (active_gateway && active_gateway != default_gateway) {
 446                 del_routes(active_gateway);
 447                 updated = TRUE;
 448         }
 449
 450         return updated;
 451 }