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 int remove_gateway(struct gateway_data *data)
 195 {
 196         int err;
 197
 198         DBG("gateway %s", data->gateway);
 199
 200         gateway_list = g_slist_remove(gateway_list, data);
 201
 202         if (data->active == TRUE)
 203                 err = del_routes(data);
 204         else
 205                 err = 0;
 206
 207         g_free(data->gateway);
 208         g_free(data->vpn_ip);
 209         g_free(data);
 210
 211         return err;
 212 }
 213
 214 static void connection_delgateway(int index, const char *gateway)
 215 {
 216         struct gateway_data *data;
 217
 218         DBG("index %d gateway %s", index, gateway);
 219
 220         data = find_gateway(index, gateway);
 221         if (data != NULL)
 222                 data->active = FALSE;
 223
 224         data = find_default_gateway();
 225         if (data != NULL)
 226                 set_default_gateway(data);
 227 }
 228
 229 static struct connman_rtnl connection_rtnl = {
 230         .name           = "connection",
 231         .newgateway     = connection_newgateway,
 232         .delgateway     = connection_delgateway,
 233 };
 234
 235 static struct gateway_data *find_active_gateway(void)
 236 {
 237         GSList *list;
 238
 239         DBG("");
 240
 241         for (list = gateway_list; list; list = list->next) {
 242                 struct gateway_data *data = list->data;
 243                 if (data->active == TRUE)
 244                         return data;
 245         }
 246
 247         return NULL;
 248 }
 249
 250 static int connection_probe(struct connman_element *element)
 251 {
 252         struct connman_service *service = NULL;
 253         const char *gateway = NULL;
 254         const char *vpn_ip = NULL;
 255         struct gateway_data *active_gateway = NULL;
 256         struct gateway_data *new_gateway = NULL;
 257
 258         DBG("element %p name %s", element, element->name);
 259
 260         if (element->parent == NULL)
 261                 return -ENODEV;
 262
 263         /* FIXME: Remove temporarily for the static gateway support */
 264         /* if (element->parent->type != CONNMAN_ELEMENT_TYPE_IPV4)
 265                 return -ENODEV; */
 266
 267         connman_element_get_value(element,
 268                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 269
 270         connman_element_get_value(element,
 271                                   CONNMAN_PROPERTY_ID_IPV4_ADDRESS, &vpn_ip);
 272
 273         DBG("gateway %s", gateway);
 274
 275         service = __connman_element_get_service(element);
 276         __connman_service_indicate_state(service,
 277                                         CONNMAN_SERVICE_STATE_READY);
 278
 279         connman_element_set_enabled(element, TRUE);
 280
 281         if (gateway == NULL)
 282                 return 0;
 283
 284         active_gateway = find_active_gateway();
 285         new_gateway = add_gateway(element->index, gateway);
 286
 287         if (service == NULL) {
 288                 new_gateway->vpn = TRUE;
 289                 new_gateway->vpn_ip = g_strdup(vpn_ip);
 290                 /* make sure vpn gateway are at higher priority */
 291                 new_gateway->order = 10;
 292                 if (active_gateway)
 293                         new_gateway->vpn_phy_index = active_gateway->index;
 294         } else
 295                 new_gateway->vpn = FALSE;
 296
 297         if (active_gateway == NULL) {
 298                 set_default_gateway(new_gateway);
 299                 return 0;
 300         }
 301
 302         if (new_gateway->vpn == TRUE) {
 303                 connman_inet_add_host_route_vpn(active_gateway->index,
 304                                                 active_gateway->gateway,
 305                                                 new_gateway->gateway);
 306         }
 307
 308         if (new_gateway->order >= active_gateway->order) {
 309                 del_routes(active_gateway);
 310                 return 0;
 311         }
 312
 313         return 0;
 314 }
 315
 316 static void connection_remove(struct connman_element *element)
 317 {
 318         struct connman_service *service;
 319         const char *gateway = NULL;
 320         struct gateway_data *data = NULL;
 321         gboolean set_default = FALSE;
 322         int err;
 323
 324         DBG("element %p name %s", element, element->name);
 325
 326         service = __connman_element_get_service(element);
 327         __connman_service_indicate_state(service,
 328                                         CONNMAN_SERVICE_STATE_DISCONNECT);
 329
 330         connman_element_set_enabled(element, FALSE);
 331
 332         connman_element_get_value(element,
 333                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 334
 335         DBG("gateway %s", gateway);
 336
 337         if (gateway == NULL)
 338                 return;
 339
 340         data = find_gateway(element->index, gateway);
 341         if (data == NULL)
 342                 return;
 343
 344         set_default = data->vpn;
 345
 346         if (data->vpn == TRUE && data->vpn_phy_index >= 0)
 347                 connman_inet_del_host_route(data->vpn_phy_index, data->gateway);
 348
 349         err = remove_gateway(data);
 350
 351         /* with vpn this will be called after the network was deleted,
 352          * we need to call set_default here because we will not recieve any
 353          * gateway delete notification.
 354          * We hit the same issue if remove_gateway() fails.
 355          */
 356         if (set_default || err < 0) {
 357                 data = find_default_gateway();
 358                 if (data != NULL)
 359                         set_default_gateway(data);
 360         }
 361 }
 362
 363 static struct connman_driver connection_driver = {
 364         .name           = "connection",
 365         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 366         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 367         .probe          = connection_probe,
 368         .remove         = connection_remove,
 369 };
 370
 371 int __connman_connection_init(void)
 372 {
 373         DBG("");
 374
 375         if (connman_rtnl_register(&connection_rtnl) < 0)
 376                 connman_error("Failed to setup RTNL gateway driver");
 377
 378         return connman_driver_register(&connection_driver);
 379 }
 380
 381 void __connman_connection_cleanup(void)
 382 {
 383         GSList *list;
 384
 385         DBG("");
 386
 387         connman_driver_unregister(&connection_driver);
 388
 389         connman_rtnl_unregister(&connection_rtnl);
 390
 391         for (list = gateway_list; list; list = list->next) {
 392                 struct gateway_data *data = list->data;
 393
 394                 DBG("index %d gateway %s", data->index, data->gateway);
 395
 396                 g_free(data->gateway);
 397                 g_free(data);
 398                 list->data = NULL;
 399         }
 400
 401         g_slist_free(gateway_list);
 402         gateway_list = NULL;
 403 }
 404
 405 static void update_order(void)
 406 {
 407         GSList *list = NULL;
 408
 409         for (list = gateway_list; list; list = list->next) {
 410                 struct gateway_data *data = list->data;
 411                 struct connman_service *service;
 412
 413                 /* vpn gataway is not attached to a service. */
 414                 if (data->vpn)
 415                         continue;
 416
 417                 service = __connman_element_get_service(data->element);
 418                 data->order = __connman_service_get_order(service);
 419         }
 420 }
 421
 422 gboolean __connman_connection_update_gateway(void)
 423 {
 424         struct gateway_data *active_gateway, *default_gateway;
 425         gboolean updated = FALSE;
 426
 427         update_order();
 428
 429         active_gateway = find_active_gateway();
 430         default_gateway = find_default_gateway();
 431
 432         if (active_gateway && active_gateway != default_gateway) {
 433                 del_routes(active_gateway);
 434                 updated = TRUE;
 435         }
 436
 437         return updated;
 438 }