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->ipv6_gateway);
 225         g_free(data->vpn_ip);
 226         g_free(data);
 227
 228         return err;
 229 }
 230
 231 static void connection_delgateway(int index, const char *gateway)
 232 {
 233         struct gateway_data *data;
 234
 235         DBG("index %d gateway %s", index, gateway);
 236
 237         data = find_gateway(index, gateway);
 238         if (data != NULL)
 239                 data->active = FALSE;
 240
 241         data = find_default_gateway();
 242         if (data != NULL)
 243                 set_default_gateway(data);
 244 }
 245
 246 static struct connman_rtnl connection_rtnl = {
 247         .name           = "connection",
 248         .newgateway     = connection_newgateway,
 249         .delgateway     = connection_delgateway,
 250 };
 251
 252 static struct gateway_data *find_active_gateway(void)
 253 {
 254         GSList *list;
 255
 256         DBG("");
 257
 258         for (list = gateway_list; list; list = list->next) {
 259                 struct gateway_data *data = list->data;
 260
 261                 if (data->active == TRUE)
 262                         return data;
 263         }
 264
 265         return NULL;
 266 }
 267
 268 static int connection_probe(struct connman_element *element)
 269 {
 270         struct connman_service *service = NULL;
 271         const char *gateway = NULL, *ipv6_gateway = NULL;
 272         const char *vpn_ip = NULL;
 273         const char *domainname = NULL;
 274         struct gateway_data *active_gateway = NULL;
 275         struct gateway_data *new_gateway = NULL;
 276
 277         DBG("element %p name %s", element, element->name);
 278
 279         if (element->parent == NULL)
 280                 return -ENODEV;
 281
 282         /* FIXME: Remove temporarily for the static gateway support */
 283         /* if (element->parent->type != CONNMAN_ELEMENT_TYPE_IPV4)
 284                 return -ENODEV; */
 285
 286         connman_element_get_value(element,
 287                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 288         connman_element_get_value(element,
 289                         CONNMAN_PROPERTY_ID_IPV6_GATEWAY, &ipv6_gateway);
 290
 291         connman_element_get_value(element,
 292                         CONNMAN_PROPERTY_ID_IPV4_PEER, &vpn_ip);
 293
 294         if (vpn_ip == NULL)
 295                 connman_element_get_value(element,
 296                                 CONNMAN_PROPERTY_ID_IPV4_ADDRESS, &vpn_ip);
 297
 298         DBG("vpn_ip %s", vpn_ip);
 299
 300         connman_element_get_value(element,
 301                         CONNMAN_PROPERTY_ID_DOMAINNAME, &domainname);
 302
 303         DBG("ipv4 gateway %s ipv6 gateway %s domainname %s",
 304                                 gateway, ipv6_gateway, domainname);
 305
 306         /*
 307          * If gateway is NULL, it's a point to point link and the default
 308          * gateway is 0.0.0.0, meaning the interface.
 309          */
 310         if (gateway == NULL) {
 311                 gateway = "0.0.0.0";
 312                 element->ipv4.gateway = g_strdup(gateway);
 313         }
 314
 315         connman_element_set_enabled(element, TRUE);
 316
 317         active_gateway = find_active_gateway();
 318         new_gateway = add_gateway(element->index, gateway, ipv6_gateway);
 319         if (new_gateway == NULL)
 320                 return 0;
 321
 322         service = __connman_element_get_service(element);
 323
 324         if (new_gateway->ipv6_gateway)
 325                 connman_inet_add_ipv6_host_route(element->index,
 326                                         new_gateway->ipv6_gateway, NULL);
 327
 328         if (g_strcmp0(new_gateway->ipv4_gateway, "0.0.0.0"))
 329                 connman_inet_add_host_route(element->index,
 330                                         new_gateway->ipv4_gateway, NULL);
 331         __connman_service_nameserver_add_routes(service,
 332                                                 new_gateway->ipv4_gateway);
 333         __connman_service_set_domainname(service, domainname);
 334
 335         __connman_service_indicate_state(service, CONNMAN_SERVICE_STATE_READY,
 336                                                 CONNMAN_IPCONFIG_TYPE_IPV4);
 337
 338         if (service == NULL) {
 339                 new_gateway->vpn = TRUE;
 340                 new_gateway->vpn_ip = g_strdup(vpn_ip);
 341                 /* make sure vpn gateway are at higher priority */
 342                 new_gateway->order = 10;
 343                 if (active_gateway)
 344                         new_gateway->vpn_phy_index = active_gateway->index;
 345         } else
 346                 new_gateway->vpn = FALSE;
 347
 348         if (active_gateway == NULL) {
 349                 set_default_gateway(new_gateway);
 350                 return 0;
 351         }
 352
 353         if (new_gateway->vpn == TRUE) {
 354                 connman_inet_add_host_route(active_gateway->index,
 355                                                 new_gateway->ipv4_gateway,
 356                                                 active_gateway->ipv4_gateway);
 357         }
 358
 359         if (new_gateway->order >= active_gateway->order) {
 360                 del_routes(active_gateway);
 361                 return 0;
 362         }
 363
 364         return 0;
 365 }
 366
 367 static void connection_remove(struct connman_element *element)
 368 {
 369         struct connman_service *service;
 370         const char *gateway = NULL;
 371         struct gateway_data *data = NULL;
 372         gboolean set_default = FALSE;
 373         int err;
 374
 375         DBG("element %p name %s", element, element->name);
 376
 377         service = __connman_element_get_service(element);
 378         __connman_service_nameserver_del_routes(service);
 379         __connman_service_indicate_state(service,
 380                                         CONNMAN_SERVICE_STATE_DISCONNECT,
 381                                         CONNMAN_IPCONFIG_TYPE_IPV4);
 382
 383         connman_element_set_enabled(element, FALSE);
 384
 385         connman_element_get_value(element,
 386                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 387
 388         DBG("gateway %s", gateway);
 389
 390         if (gateway == NULL)
 391                 return;
 392
 393         data = find_gateway(element->index, gateway);
 394         if (data == NULL)
 395                 return;
 396
 397         set_default = data->vpn;
 398
 399         if (data->vpn == TRUE && data->vpn_phy_index >= 0)
 400                 connman_inet_del_host_route(data->vpn_phy_index,
 401                                                 data->ipv4_gateway);
 402         err = remove_gateway(data);
 403
 404         /* with vpn this will be called after the network was deleted,
 405          * we need to call set_default here because we will not recieve any
 406          * gateway delete notification.
 407          * We hit the same issue if remove_gateway() fails.
 408          */
 409         if (set_default || err < 0) {
 410                 data = find_default_gateway();
 411                 if (data != NULL)
 412                         set_default_gateway(data);
 413         }
 414
 415         connman_element_unref(element);
 416 }
 417
 418 static struct connman_driver connection_driver = {
 419         .name           = "connection",
 420         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 421         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 422         .probe          = connection_probe,
 423         .remove         = connection_remove,
 424 };
 425
 426 int __connman_connection_init(void)
 427 {
 428         DBG("");
 429
 430         if (connman_rtnl_register(&connection_rtnl) < 0)
 431                 connman_error("Failed to setup RTNL gateway driver");
 432
 433         return connman_driver_register(&connection_driver);
 434 }
 435
 436 void __connman_connection_cleanup(void)
 437 {
 438         GSList *list;
 439
 440         DBG("");
 441
 442         connman_driver_unregister(&connection_driver);
 443
 444         connman_rtnl_unregister(&connection_rtnl);
 445
 446         for (list = gateway_list; list; list = list->next) {
 447                 struct gateway_data *data = list->data;
 448
 449                 DBG("index %d gateway %s", data->index, data->ipv4_gateway);
 450
 451                 g_free(data->ipv4_gateway);
 452                 g_free(data);
 453                 list->data = NULL;
 454         }
 455
 456         g_slist_free(gateway_list);
 457         gateway_list = NULL;
 458 }
 459
 460 static void update_order(void)
 461 {
 462         GSList *list = NULL;
 463
 464         for (list = gateway_list; list; list = list->next) {
 465                 struct gateway_data *data = list->data;
 466                 struct connman_service *service;
 467                 int index = data->index;
 468
 469                 if (data->vpn)
 470                         service = __connman_service_lookup_from_index(index);
 471                 else
 472                         service = __connman_element_get_service(data->element);
 473
 474                 data->order = __connman_service_get_order(service);
 475         }
 476 }
 477
 478 gboolean __connman_connection_update_gateway(void)
 479 {
 480         struct gateway_data *active_gateway, *default_gateway;
 481         gboolean updated = FALSE;
 482
 483         update_order();
 484
 485         active_gateway = find_active_gateway();
 486         default_gateway = find_default_gateway();
 487
 488         if (active_gateway && active_gateway != default_gateway) {
 489                 del_routes(active_gateway);
 490                 updated = TRUE;
 491         }
 492
 493         return updated;
 494 }