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