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