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 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                 /* vpn gateway going away no changes in services */
 166                 return;
 167         }
 168
 169         if (g_strcmp0(data->ipv4_gateway, "0.0.0.0") == 0) {
 170                 if (connman_inet_set_gateway_interface(element->index) < 0)
 171                         return;
 172                 goto done;
 173         }
 174
 175         connman_inet_set_ipv6_gateway_address(element->index,
 176                                                 data->ipv6_gateway);
 177         if (connman_inet_set_gateway_address(element->index,
 178                                         data->ipv4_gateway) < 0)
 179                 return;
 180
 181 done:
 182         service = __connman_element_get_service(element);
 183         __connman_service_indicate_default(service);
 184 }
 185
 186 static struct gateway_data *find_default_gateway(void)
 187 {
 188         struct gateway_data *found = NULL;
 189         unsigned int order = 0;
 190         GSList *list;
 191
 192         for (list = gateway_list; list; list = list->next) {
 193                 struct gateway_data *data = list->data;
 194
 195                 if (found == NULL || data->order > order) {
 196                         found = data;
 197                         order = data->order;
 198                 }
 199         }
 200
 201         return found;
 202 }
 203
 204 static int remove_gateway(struct gateway_data *data)
 205 {
 206         int err;
 207
 208         DBG("gateway %s", data->ipv4_gateway);
 209
 210         gateway_list = g_slist_remove(gateway_list, data);
 211
 212         if (data->active == TRUE)
 213                 err = del_routes(data);
 214         else
 215                 err = 0;
 216
 217         g_free(data->ipv4_gateway);
 218         g_free(data->vpn_ip);
 219         g_free(data);
 220
 221         return err;
 222 }
 223
 224 static void connection_delgateway(int index, const char *gateway)
 225 {
 226         struct gateway_data *data;
 227
 228         DBG("index %d gateway %s", index, gateway);
 229
 230         data = find_gateway(index, gateway);
 231         if (data != NULL)
 232                 data->active = FALSE;
 233
 234         data = find_default_gateway();
 235         if (data != NULL)
 236                 set_default_gateway(data);
 237 }
 238
 239 static struct connman_rtnl connection_rtnl = {
 240         .name           = "connection",
 241         .newgateway     = connection_newgateway,
 242         .delgateway     = connection_delgateway,
 243 };
 244
 245 static struct gateway_data *find_active_gateway(void)
 246 {
 247         GSList *list;
 248
 249         DBG("");
 250
 251         for (list = gateway_list; list; list = list->next) {
 252                 struct gateway_data *data = list->data;
 253
 254                 if (data->active == TRUE)
 255                         return data;
 256         }
 257
 258         return NULL;
 259 }
 260
 261 static int connection_probe(struct connman_element *element)
 262 {
 263         struct connman_service *service = NULL;
 264         const char *gateway = NULL, *ipv6_gateway = NULL;
 265         const char *vpn_ip = NULL;
 266         struct gateway_data *active_gateway = NULL;
 267         struct gateway_data *new_gateway = NULL;
 268
 269         DBG("element %p name %s", element, element->name);
 270
 271         if (element->parent == NULL)
 272                 return -ENODEV;
 273
 274         /* FIXME: Remove temporarily for the static gateway support */
 275         /* if (element->parent->type != CONNMAN_ELEMENT_TYPE_IPV4)
 276                 return -ENODEV; */
 277
 278         connman_element_get_value(element,
 279                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 280         connman_element_get_value(element,
 281                         CONNMAN_PROPERTY_ID_IPV6_GATEWAY, &ipv6_gateway);
 282
 283         connman_element_get_value(element,
 284                                   CONNMAN_PROPERTY_ID_IPV4_ADDRESS, &vpn_ip);
 285
 286         DBG("gateway %s, ipv6_gateway %s", gateway, ipv6_gateway);
 287
 288         /*
 289          * If gateway is NULL, it's a point to point link and the default
 290          * gateway is 0.0.0.0, meaning the interface.
 291          */
 292         if (gateway == NULL) {
 293                 gateway = "0.0.0.0";
 294                 element->ipv4.gateway = g_strdup(gateway);
 295         }
 296
 297         connman_element_set_enabled(element, TRUE);
 298
 299         active_gateway = find_active_gateway();
 300         new_gateway = add_gateway(element->index, gateway, ipv6_gateway);
 301         if (new_gateway == NULL)
 302                 return 0;
 303
 304         service = __connman_element_get_service(element);
 305
 306         connman_inet_add_ipv6_host_route(element->index,
 307                                         new_gateway->ipv6_gateway, NULL);
 308         connman_inet_add_host_route(element->index,
 309                                         new_gateway->ipv4_gateway, NULL);
 310         __connman_service_nameserver_add_routes(service,
 311                                                 new_gateway->ipv4_gateway);
 312
 313         __connman_service_indicate_state(service, CONNMAN_SERVICE_STATE_READY);
 314
 315         if (service == NULL) {
 316                 new_gateway->vpn = TRUE;
 317                 new_gateway->vpn_ip = g_strdup(vpn_ip);
 318                 /* make sure vpn gateway are at higher priority */
 319                 new_gateway->order = 10;
 320                 if (active_gateway)
 321                         new_gateway->vpn_phy_index = active_gateway->index;
 322         } else
 323                 new_gateway->vpn = FALSE;
 324
 325         if (active_gateway == NULL) {
 326                 set_default_gateway(new_gateway);
 327                 return 0;
 328         }
 329
 330         if (new_gateway->vpn == TRUE) {
 331                 connman_inet_add_host_route(active_gateway->index,
 332                                                 new_gateway->ipv4_gateway,
 333                                                 active_gateway->ipv4_gateway);
 334         }
 335
 336         if (new_gateway->order >= active_gateway->order) {
 337                 del_routes(active_gateway);
 338                 return 0;
 339         }
 340
 341         return 0;
 342 }
 343
 344 static void connection_remove(struct connman_element *element)
 345 {
 346         struct connman_service *service;
 347         const char *gateway = NULL;
 348         struct gateway_data *data = NULL;
 349         gboolean set_default = FALSE;
 350         int err;
 351
 352         DBG("element %p name %s", element, element->name);
 353
 354         service = __connman_element_get_service(element);
 355         __connman_service_nameserver_del_routes(service);
 356         __connman_service_indicate_state(service,
 357                                         CONNMAN_SERVICE_STATE_DISCONNECT);
 358
 359         connman_element_set_enabled(element, FALSE);
 360
 361         connman_element_get_value(element,
 362                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 363
 364         DBG("gateway %s", gateway);
 365
 366         if (gateway == NULL)
 367                 return;
 368
 369         data = find_gateway(element->index, gateway);
 370         if (data == NULL)
 371                 return;
 372
 373         set_default = data->vpn;
 374
 375         if (data->vpn == TRUE && data->vpn_phy_index >= 0)
 376                 connman_inet_del_host_route(data->vpn_phy_index,
 377                                                 data->ipv4_gateway);
 378         err = remove_gateway(data);
 379
 380         /* with vpn this will be called after the network was deleted,
 381          * we need to call set_default here because we will not recieve any
 382          * gateway delete notification.
 383          * We hit the same issue if remove_gateway() fails.
 384          */
 385         if (set_default || err < 0) {
 386                 data = find_default_gateway();
 387                 if (data != NULL)
 388                         set_default_gateway(data);
 389         }
 390 }
 391
 392 static struct connman_driver connection_driver = {
 393         .name           = "connection",
 394         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 395         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 396         .probe          = connection_probe,
 397         .remove         = connection_remove,
 398 };
 399
 400 int __connman_connection_init(void)
 401 {
 402         DBG("");
 403
 404         if (connman_rtnl_register(&connection_rtnl) < 0)
 405                 connman_error("Failed to setup RTNL gateway driver");
 406
 407         return connman_driver_register(&connection_driver);
 408 }
 409
 410 void __connman_connection_cleanup(void)
 411 {
 412         GSList *list;
 413
 414         DBG("");
 415
 416         connman_driver_unregister(&connection_driver);
 417
 418         connman_rtnl_unregister(&connection_rtnl);
 419
 420         for (list = gateway_list; list; list = list->next) {
 421                 struct gateway_data *data = list->data;
 422
 423                 DBG("index %d gateway %s", data->index, data->ipv4_gateway);
 424
 425                 g_free(data->ipv4_gateway);
 426                 g_free(data);
 427                 list->data = NULL;
 428         }
 429
 430         g_slist_free(gateway_list);
 431         gateway_list = NULL;
 432 }
 433
 434 static void update_order(void)
 435 {
 436         GSList *list = NULL;
 437
 438         for (list = gateway_list; list; list = list->next) {
 439                 struct gateway_data *data = list->data;
 440                 struct connman_service *service;
 441
 442                 /* vpn gataway is not attached to a service. */
 443                 if (data->vpn)
 444                         continue;
 445
 446                 service = __connman_element_get_service(data->element);
 447                 data->order = __connman_service_get_order(service);
 448         }
 449 }
 450
 451 gboolean __connman_connection_update_gateway(void)
 452 {
 453         struct gateway_data *active_gateway, *default_gateway;
 454         gboolean updated = FALSE;
 455
 456         update_order();
 457
 458         active_gateway = find_active_gateway();
 459         default_gateway = find_default_gateway();
 460
 461         if (active_gateway && active_gateway != default_gateway) {
 462                 del_routes(active_gateway);
 463                 updated = TRUE;
 464         }
 465
 466         return updated;
 467 }