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_PEER, &vpn_ip);
 292
 293         if (vpn_ip == NULL)
 294                 connman_element_get_value(element,
 295                                 CONNMAN_PROPERTY_ID_IPV4_ADDRESS, &vpn_ip);
 296
 297         DBG("vpn_ip %s", vpn_ip);
 298
 299         connman_element_get_value(element,
 300                         CONNMAN_PROPERTY_ID_DOMAINNAME, &domainname);
 301
 302         DBG("ipv4 gateway %s ipv6 gateway %s domainname %s",
 303                                 gateway, ipv6_gateway, domainname);
 304
 305         /*
 306          * If gateway is NULL, it's a point to point link and the default
 307          * gateway is 0.0.0.0, meaning the interface.
 308          */
 309         if (gateway == NULL) {
 310                 gateway = "0.0.0.0";
 311                 element->ipv4.gateway = g_strdup(gateway);
 312         }
 313
 314         connman_element_set_enabled(element, TRUE);
 315
 316         active_gateway = find_active_gateway();
 317         new_gateway = add_gateway(element->index, gateway, ipv6_gateway);
 318         if (new_gateway == NULL)
 319                 return 0;
 320
 321         service = __connman_element_get_service(element);
 322
 323         if (new_gateway->ipv6_gateway)
 324                 connman_inet_add_ipv6_host_route(element->index,
 325                                         new_gateway->ipv6_gateway, NULL);
 326
 327         if (g_strcmp0(new_gateway->ipv4_gateway, "0.0.0.0"))
 328                 connman_inet_add_host_route(element->index,
 329                                         new_gateway->ipv4_gateway, NULL);
 330         __connman_service_nameserver_add_routes(service,
 331                                                 new_gateway->ipv4_gateway);
 332         __connman_service_set_domainname(service, domainname);
 333
 334         __connman_service_indicate_state(service, CONNMAN_SERVICE_STATE_READY);
 335
 336         if (service == NULL) {
 337                 new_gateway->vpn = TRUE;
 338                 new_gateway->vpn_ip = g_strdup(vpn_ip);
 339                 /* make sure vpn gateway are at higher priority */
 340                 new_gateway->order = 10;
 341                 if (active_gateway)
 342                         new_gateway->vpn_phy_index = active_gateway->index;
 343         } else
 344                 new_gateway->vpn = FALSE;
 345
 346         if (active_gateway == NULL) {
 347                 set_default_gateway(new_gateway);
 348                 return 0;
 349         }
 350
 351         if (new_gateway->vpn == TRUE) {
 352                 connman_inet_add_host_route(active_gateway->index,
 353                                                 new_gateway->ipv4_gateway,
 354                                                 active_gateway->ipv4_gateway);
 355         }
 356
 357         if (new_gateway->order >= active_gateway->order) {
 358                 del_routes(active_gateway);
 359                 return 0;
 360         }
 361
 362         return 0;
 363 }
 364
 365 static void connection_remove(struct connman_element *element)
 366 {
 367         struct connman_service *service;
 368         const char *gateway = NULL;
 369         struct gateway_data *data = NULL;
 370         gboolean set_default = FALSE;
 371         int err;
 372
 373         DBG("element %p name %s", element, element->name);
 374
 375         service = __connman_element_get_service(element);
 376         __connman_service_nameserver_del_routes(service);
 377         __connman_service_indicate_state(service,
 378                                         CONNMAN_SERVICE_STATE_DISCONNECT);
 379
 380         connman_element_set_enabled(element, FALSE);
 381
 382         connman_element_get_value(element,
 383                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 384
 385         DBG("gateway %s", gateway);
 386
 387         if (gateway == NULL)
 388                 return;
 389
 390         data = find_gateway(element->index, gateway);
 391         if (data == NULL)
 392                 return;
 393
 394         set_default = data->vpn;
 395
 396         if (data->vpn == TRUE && data->vpn_phy_index >= 0)
 397                 connman_inet_del_host_route(data->vpn_phy_index,
 398                                                 data->ipv4_gateway);
 399         err = remove_gateway(data);
 400
 401         /* with vpn this will be called after the network was deleted,
 402          * we need to call set_default here because we will not recieve any
 403          * gateway delete notification.
 404          * We hit the same issue if remove_gateway() fails.
 405          */
 406         if (set_default || err < 0) {
 407                 data = find_default_gateway();
 408                 if (data != NULL)
 409                         set_default_gateway(data);
 410         }
 411 }
 412
 413 static struct connman_driver connection_driver = {
 414         .name           = "connection",
 415         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 416         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 417         .probe          = connection_probe,
 418         .remove         = connection_remove,
 419 };
 420
 421 int __connman_connection_init(void)
 422 {
 423         DBG("");
 424
 425         if (connman_rtnl_register(&connection_rtnl) < 0)
 426                 connman_error("Failed to setup RTNL gateway driver");
 427
 428         return connman_driver_register(&connection_driver);
 429 }
 430
 431 void __connman_connection_cleanup(void)
 432 {
 433         GSList *list;
 434
 435         DBG("");
 436
 437         connman_driver_unregister(&connection_driver);
 438
 439         connman_rtnl_unregister(&connection_rtnl);
 440
 441         for (list = gateway_list; list; list = list->next) {
 442                 struct gateway_data *data = list->data;
 443
 444                 DBG("index %d gateway %s", data->index, data->ipv4_gateway);
 445
 446                 g_free(data->ipv4_gateway);
 447                 g_free(data);
 448                 list->data = NULL;
 449         }
 450
 451         g_slist_free(gateway_list);
 452         gateway_list = NULL;
 453 }
 454
 455 static void update_order(void)
 456 {
 457         GSList *list = NULL;
 458
 459         for (list = gateway_list; list; list = list->next) {
 460                 struct gateway_data *data = list->data;
 461                 struct connman_service *service;
 462                 int index = data->index;
 463
 464                 if (data->vpn)
 465                         service = __connman_service_lookup_from_index(index);
 466                 else
 467                         service = __connman_element_get_service(data->element);
 468
 469                 data->order = __connman_service_get_order(service);
 470         }
 471 }
 472
 473 gboolean __connman_connection_update_gateway(void)
 474 {
 475         struct gateway_data *active_gateway, *default_gateway;
 476         gboolean updated = FALSE;
 477
 478         update_order();
 479
 480         active_gateway = find_active_gateway();
 481         default_gateway = find_default_gateway();
 482
 483         if (active_gateway && active_gateway != default_gateway) {
 484                 del_routes(active_gateway);
 485                 updated = TRUE;
 486         }
 487
 488         return updated;
 489 }