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         char *ipv6_gateway;
  37         struct connman_element *element;
  38         unsigned int order;
  39         gboolean active;
  40         /* VPN extra data */
  41         gboolean vpn;
  42         char *vpn_ip;
  43         int vpn_phy_index;
  44 };
  45
  46 static GSList *gateway_list = NULL;
  47
  48 static struct gateway_data *find_gateway(int index, const char *gateway)
  49 {
  50         GSList *list;
  51
  52         if (gateway == NULL)
  53                 return NULL;
  54
  55         for (list = gateway_list; list; list = list->next) {
  56                 struct gateway_data *data = list->data;
  57
  58                 if (data->ipv4_gateway == NULL)
  59                         continue;
  60
  61                 if (data->index == index &&
  62                                 g_str_equal(data->ipv4_gateway, gateway)
  63                                                                 == TRUE)
  64                         return data;
  65         }
  66
  67         return NULL;
  68 }
  69
  70 static int del_routes(struct gateway_data *data)
  71 {
  72         if (data->vpn) {
  73                 if (data->vpn_phy_index >= 0)
  74                         connman_inet_del_host_route(data->vpn_phy_index,
  75                                                         data->ipv4_gateway);
  76                 return connman_inet_clear_gateway_address(data->index,
  77                                                         data->vpn_ip);
  78         } else if (g_strcmp0(data->ipv4_gateway, "0.0.0.0") == 0) {
  79                 return connman_inet_clear_gateway_interface(data->index);
  80         } else {
  81                 connman_inet_del_ipv6_host_route(data->index,
  82                                                 data->ipv6_gateway);
  83                 connman_inet_clear_ipv6_gateway_address(data->index,
  84                                                         data->ipv6_gateway);
  85                 connman_inet_del_host_route(data->index, data->ipv4_gateway);
  86                 return connman_inet_clear_gateway_address(data->index,
  87                                                         data->ipv4_gateway);
  88         }
  89 }
  90
  91 static void find_element(struct connman_element *element, gpointer user_data)
  92 {
  93         struct gateway_data *data = user_data;
  94
  95         DBG("element %p name %s", element, element->name);
  96
  97         if (data->element != NULL)
  98                 return;
  99
 100         if (element->index != data->index)
 101                 return;
 102
 103         data->element = element;
 104 }
 105
 106 static struct gateway_data *add_gateway(int index, const char *gateway,
 107                                                 const char *ipv6_gateway)
 108 {
 109         struct gateway_data *data;
 110         struct connman_service *service;
 111
 112         DBG("index %d ipv4 gateway %s ipv6 gateway %s", index, gateway,
 113                                                         ipv6_gateway);
 114
 115         if (strlen(gateway) == 0)
 116                 return NULL;
 117
 118         data = g_try_new0(struct gateway_data, 1);
 119         if (data == NULL)
 120                 return NULL;
 121
 122         data->index = index;
 123         data->ipv4_gateway = g_strdup(gateway);
 124         data->ipv6_gateway = g_strdup(ipv6_gateway);
 125         data->active = FALSE;
 126         data->element = NULL;
 127         data->vpn_ip = NULL;
 128         data->vpn = FALSE;
 129         data->vpn_phy_index = -1;
 130
 131         __connman_element_foreach(NULL, CONNMAN_ELEMENT_TYPE_CONNECTION,
 132                                                         find_element, data);
 133
 134         service = __connman_element_get_service(data->element);
 135         data->order = __connman_service_get_order(service);
 136
 137         gateway_list = g_slist_append(gateway_list, data);
 138
 139         return data;
 140 }
 141
 142 static void connection_newgateway(int index, const char *gateway)
 143 {
 144         struct gateway_data *data;
 145
 146         DBG("index %d gateway %s", index, gateway);
 147
 148         data = find_gateway(index, gateway);
 149         if (data == NULL)
 150                 return;
 151
 152         data->active = TRUE;
 153 }
 154
 155 static void set_default_gateway(struct gateway_data *data)
 156 {
 157         struct connman_element *element = data->element;
 158         struct connman_service *service = NULL;
 159
 160         DBG("gateway %s", data->ipv4_gateway);
 161
 162         if (data->vpn == TRUE) {
 163                 connman_inet_set_gateway_address(data->index, data->vpn_ip);
 164                 data->active = TRUE;
 165
 166                 service = __connman_service_lookup_from_index(data->index);
 167                 if (service == NULL)
 168                         return;
 169
 170                 __connman_service_indicate_default(service);
 171
 172                 return;
 173         }
 174
 175         if (g_strcmp0(data->ipv4_gateway, "0.0.0.0") == 0) {
 176                 if (connman_inet_set_gateway_interface(element->index) < 0)
 177                         return;
 178                 goto done;
 179         }
 180
 181         connman_inet_set_ipv6_gateway_address(element->index,
 182                                                 data->ipv6_gateway);
 183         if (connman_inet_set_gateway_address(element->index,
 184                                         data->ipv4_gateway) < 0)
 185                 return;
 186
 187 done:
 188         service = __connman_element_get_service(element);
 189         __connman_service_indicate_default(service);
 190 }
 191
 192 static struct gateway_data *find_default_gateway(void)
 193 {
 194         struct gateway_data *found = NULL;
 195         unsigned int order = 0;
 196         GSList *list;
 197
 198         for (list = gateway_list; list; list = list->next) {
 199                 struct gateway_data *data = list->data;
 200
 201                 if (found == NULL || data->order > order) {
 202                         found = data;
 203                         order = data->order;
 204                 }
 205         }
 206
 207         return found;
 208 }
 209
 210 static int remove_gateway(struct gateway_data *data)
 211 {
 212         int err;
 213
 214         DBG("gateway %s", data->ipv4_gateway);
 215
 216         gateway_list = g_slist_remove(gateway_list, data);
 217
 218         if (data->active == TRUE)
 219                 err = del_routes(data);
 220         else
 221                 err = 0;
 222
 223         g_free(data->ipv4_gateway);
 224         g_free(data->vpn_ip);
 225         g_free(data);
 226
 227         return err;
 228 }
 229
 230 static void connection_delgateway(int index, const char *gateway)
 231 {
 232         struct gateway_data *data;
 233
 234         DBG("index %d gateway %s", index, gateway);
 235
 236         data = find_gateway(index, gateway);
 237         if (data != NULL)
 238                 data->active = FALSE;
 239
 240         data = find_default_gateway();
 241         if (data != NULL)
 242                 set_default_gateway(data);
 243 }
 244
 245 static struct connman_rtnl connection_rtnl = {
 246         .name           = "connection",
 247         .newgateway     = connection_newgateway,
 248         .delgateway     = connection_delgateway,
 249 };
 250
 251 static struct gateway_data *find_active_gateway(void)
 252 {
 253         GSList *list;
 254
 255         DBG("");
 256
 257         for (list = gateway_list; list; list = list->next) {
 258                 struct gateway_data *data = list->data;
 259
 260                 if (data->active == TRUE)
 261                         return data;
 262         }
 263
 264         return NULL;
 265 }
 266
 267 static int connection_probe(struct connman_element *element)
 268 {
 269         struct connman_service *service = NULL;
 270         const char *gateway = NULL, *ipv6_gateway = NULL;
 271         const char *vpn_ip = NULL;
 272         const char *domainname = NULL;
 273         struct gateway_data *active_gateway = NULL;
 274         struct gateway_data *new_gateway = NULL;
 275
 276         DBG("element %p name %s", element, element->name);
 277
 278         if (element->parent == NULL)
 279                 return -ENODEV;
 280
 281         /* FIXME: Remove temporarily for the static gateway support */
 282         /* if (element->parent->type != CONNMAN_ELEMENT_TYPE_IPV4)
 283                 return -ENODEV; */
 284
 285         connman_element_get_value(element,
 286                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 287         connman_element_get_value(element,
 288                         CONNMAN_PROPERTY_ID_IPV6_GATEWAY, &ipv6_gateway);
 289
 290         connman_element_get_value(element,
 291                         CONNMAN_PROPERTY_ID_IPV4_ADDRESS, &vpn_ip);
 292
 293         connman_element_get_value(element,
 294                         CONNMAN_PROPERTY_ID_DOMAINNAME, &domainname);
 295
 296         DBG("ipv4 gateway %s ipv6 gateway %s domainname %s",
 297                                 gateway, ipv6_gateway, domainname);
 298
 299         /*
 300          * If gateway is NULL, it's a point to point link and the default
 301          * gateway is 0.0.0.0, meaning the interface.
 302          */
 303         if (gateway == NULL) {
 304                 gateway = "0.0.0.0";
 305                 element->ipv4.gateway = g_strdup(gateway);
 306         }
 307
 308         connman_element_set_enabled(element, TRUE);
 309
 310         active_gateway = find_active_gateway();
 311         new_gateway = add_gateway(element->index, gateway, ipv6_gateway);
 312         if (new_gateway == NULL)
 313                 return 0;
 314
 315         service = __connman_element_get_service(element);
 316
 317         connman_inet_add_ipv6_host_route(element->index,
 318                                         new_gateway->ipv6_gateway, NULL);
 319         connman_inet_add_host_route(element->index,
 320                                         new_gateway->ipv4_gateway, NULL);
 321         __connman_service_nameserver_add_routes(service,
 322                                                 new_gateway->ipv4_gateway);
 323         __connman_service_set_domainname(service, domainname);
 324
 325         __connman_service_indicate_state(service, CONNMAN_SERVICE_STATE_READY);
 326
 327         if (service == NULL) {
 328                 new_gateway->vpn = TRUE;
 329                 new_gateway->vpn_ip = g_strdup(vpn_ip);
 330                 /* make sure vpn gateway are at higher priority */
 331                 new_gateway->order = 10;
 332                 if (active_gateway)
 333                         new_gateway->vpn_phy_index = active_gateway->index;
 334         } else
 335                 new_gateway->vpn = FALSE;
 336
 337         if (active_gateway == NULL) {
 338                 set_default_gateway(new_gateway);
 339                 return 0;
 340         }
 341
 342         if (new_gateway->vpn == TRUE) {
 343                 connman_inet_add_host_route(active_gateway->index,
 344                                                 new_gateway->ipv4_gateway,
 345                                                 active_gateway->ipv4_gateway);
 346         }
 347
 348         if (new_gateway->order >= active_gateway->order) {
 349                 del_routes(active_gateway);
 350                 return 0;
 351         }
 352
 353         return 0;
 354 }
 355
 356 static void connection_remove(struct connman_element *element)
 357 {
 358         struct connman_service *service;
 359         const char *gateway = NULL;
 360         struct gateway_data *data = NULL;
 361         gboolean set_default = FALSE;
 362         int err;
 363
 364         DBG("element %p name %s", element, element->name);
 365
 366         service = __connman_element_get_service(element);
 367         __connman_service_nameserver_del_routes(service);
 368         __connman_service_indicate_state(service,
 369                                         CONNMAN_SERVICE_STATE_DISCONNECT);
 370
 371         connman_element_set_enabled(element, FALSE);
 372
 373         connman_element_get_value(element,
 374                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 375
 376         DBG("gateway %s", gateway);
 377
 378         if (gateway == NULL)
 379                 return;
 380
 381         data = find_gateway(element->index, gateway);
 382         if (data == NULL)
 383                 return;
 384
 385         set_default = data->vpn;
 386
 387         if (data->vpn == TRUE && data->vpn_phy_index >= 0)
 388                 connman_inet_del_host_route(data->vpn_phy_index,
 389                                                 data->ipv4_gateway);
 390         err = remove_gateway(data);
 391
 392         /* with vpn this will be called after the network was deleted,
 393          * we need to call set_default here because we will not recieve any
 394          * gateway delete notification.
 395          * We hit the same issue if remove_gateway() fails.
 396          */
 397         if (set_default || err < 0) {
 398                 data = find_default_gateway();
 399                 if (data != NULL)
 400                         set_default_gateway(data);
 401         }
 402 }
 403
 404 static struct connman_driver connection_driver = {
 405         .name           = "connection",
 406         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 407         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 408         .probe          = connection_probe,
 409         .remove         = connection_remove,
 410 };
 411
 412 int __connman_connection_init(void)
 413 {
 414         DBG("");
 415
 416         if (connman_rtnl_register(&connection_rtnl) < 0)
 417                 connman_error("Failed to setup RTNL gateway driver");
 418
 419         return connman_driver_register(&connection_driver);
 420 }
 421
 422 void __connman_connection_cleanup(void)
 423 {
 424         GSList *list;
 425
 426         DBG("");
 427
 428         connman_driver_unregister(&connection_driver);
 429
 430         connman_rtnl_unregister(&connection_rtnl);
 431
 432         for (list = gateway_list; list; list = list->next) {
 433                 struct gateway_data *data = list->data;
 434
 435                 DBG("index %d gateway %s", data->index, data->ipv4_gateway);
 436
 437                 g_free(data->ipv4_gateway);
 438                 g_free(data);
 439                 list->data = NULL;
 440         }
 441
 442         g_slist_free(gateway_list);
 443         gateway_list = NULL;
 444 }
 445
 446 static void update_order(void)
 447 {
 448         GSList *list = NULL;
 449
 450         for (list = gateway_list; list; list = list->next) {
 451                 struct gateway_data *data = list->data;
 452                 struct connman_service *service;
 453                 int index = data->index;
 454
 455                 if (data->vpn)
 456                         service = __connman_service_lookup_from_index(index);
 457                 else
 458                         service = __connman_element_get_service(data->element);
 459
 460                 data->order = __connman_service_get_order(service);
 461         }
 462 }
 463
 464 gboolean __connman_connection_update_gateway(void)
 465 {
 466         struct gateway_data *active_gateway, *default_gateway;
 467         gboolean updated = FALSE;
 468
 469         update_order();
 470
 471         active_gateway = find_active_gateway();
 472         default_gateway = find_default_gateway();
 473
 474         if (active_gateway && active_gateway != default_gateway) {
 475                 del_routes(active_gateway);
 476                 updated = TRUE;
 477         }
 478
 479         return updated;
 480 }