src/connection.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2009  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 <errno.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <sys/ioctl.h>
  30 #include <arpa/inet.h>
  31 #include <net/if.h>
  32 #include <net/route.h>
  33
  34 #include <gdbus.h>
  35
  36 #include "connman.h"
  37
  38 struct gateway_data {
  39         int index;
  40         char *gateway;
  41         struct connman_element *element;
  42         unsigned int order;
  43         gboolean active;
  44         /* VPN extra data */
  45         gboolean vpn;
  46         char *vpn_ip;
  47 };
  48
  49 static GSList *gateway_list = NULL;
  50
  51 static struct gateway_data *find_gateway(int index, const char *gateway)
  52 {
  53         GSList *list;
  54
  55         if (gateway == NULL)
  56                 return NULL;
  57
  58         for (list = gateway_list; list; list = list->next) {
  59                 struct gateway_data *data = list->data;
  60
  61                 if (data->gateway == NULL)
  62                         continue;
  63
  64                 if (data->index == index &&
  65                                 g_str_equal(data->gateway, gateway) == TRUE)
  66                         return data;
  67         }
  68
  69         return NULL;
  70 }
  71
  72 static int add_vpn_host(struct connman_element *element,
  73                         const char *gateway,
  74                         const char *host)
  75 {
  76         struct ifreq ifr;
  77         struct rtentry rt;
  78         struct sockaddr_in addr;
  79         int sk, err;
  80
  81         DBG("element %p", element);
  82
  83         sk = socket(PF_INET, SOCK_DGRAM, 0);
  84         if (sk < 0)
  85                 return -1;
  86
  87         memset(&ifr, 0, sizeof(ifr));
  88         ifr.ifr_ifindex = element->index;
  89
  90         if (ioctl(sk, SIOCGIFNAME, &ifr) < 0) {
  91                 close(sk);
  92                 return -1;
  93         }
  94         DBG("ifname %s", ifr.ifr_name);
  95
  96         memset(&rt, 0, sizeof(rt));
  97         rt.rt_flags = RTF_UP | RTF_HOST | RTF_GATEWAY;
  98
  99         memset(&addr, 0, sizeof(addr));
 100         addr.sin_family = AF_INET;
 101         addr.sin_addr.s_addr = inet_addr(host);
 102         memcpy(&rt.rt_dst, &addr, sizeof(rt.rt_dst));
 103
 104         memset(&addr, 0, sizeof(addr));
 105         addr.sin_family = AF_INET;
 106         addr.sin_addr.s_addr = inet_addr(gateway);
 107         memcpy(&rt.rt_gateway, &addr, sizeof(rt.rt_gateway));
 108
 109         memset(&addr, 0, sizeof(addr));
 110         addr.sin_family = AF_INET;
 111         addr.sin_addr.s_addr = INADDR_NONE;
 112         memcpy(&rt.rt_genmask, &addr, sizeof(rt.rt_genmask));
 113
 114         rt.rt_dev = ifr.ifr_name;
 115
 116         err = ioctl(sk, SIOCADDRT, &rt);
 117         if (err < 0)
 118                 connman_error("Setting VPN host failed (%s)",
 119                               strerror(errno));
 120
 121         close(sk);
 122
 123         return err;
 124 }
 125
 126 static int del_vpn_host(const char *host)
 127 {
 128         struct rtentry rt;
 129         struct sockaddr_in addr;
 130         int sk, err;
 131
 132         sk = socket(PF_INET, SOCK_DGRAM, 0);
 133         if (sk < 0)
 134                 return -1;
 135
 136         memset(&rt, 0, sizeof(rt));
 137         rt.rt_flags = RTF_UP | RTF_HOST;
 138
 139         memset(&addr, 0, sizeof(addr));
 140         addr.sin_family = AF_INET;
 141         addr.sin_addr.s_addr = inet_addr(host);
 142         memcpy(&rt.rt_dst, &addr, sizeof(rt.rt_dst));
 143
 144         err = ioctl(sk, SIOCDELRT, &rt);
 145         if (err < 0)
 146                 connman_error("Del vpn route failed (%s)",
 147                               strerror(errno));
 148
 149         close(sk);
 150
 151         return err;
 152 }
 153
 154 static int set_vpn_route(struct connman_element *element, const char *gateway)
 155 {
 156         struct ifreq ifr;
 157         struct rtentry rt;
 158         struct sockaddr_in addr;
 159         int sk, err;
 160
 161         DBG("set_rout1: element %p", element);
 162
 163         sk = socket(PF_INET, SOCK_DGRAM, 0);
 164         if (sk < 0)
 165                 return -1;
 166
 167         memset(&ifr, 0, sizeof(ifr));
 168         ifr.ifr_ifindex = element->index;
 169
 170         if (ioctl(sk, SIOCGIFNAME, &ifr) < 0) {
 171                 close(sk);
 172                 return -1;
 173         }
 174
 175         DBG("ifname %s", ifr.ifr_name);
 176
 177         memset(&ifr, 0, sizeof(ifr));
 178         ifr.ifr_ifindex = element->index;
 179
 180         memset(&rt, 0, sizeof(rt));
 181         rt.rt_flags = RTF_UP | RTF_GATEWAY;
 182
 183         memset(&addr, 0, sizeof(addr));
 184         addr.sin_family = AF_INET;
 185         addr.sin_addr.s_addr = INADDR_ANY;
 186         memcpy(&rt.rt_dst, &addr, sizeof(rt.rt_dst));
 187
 188         memset(&addr, 0, sizeof(addr));
 189         addr.sin_family = AF_INET;
 190         addr.sin_addr.s_addr = inet_addr(gateway);
 191         memcpy(&rt.rt_gateway, &addr, sizeof(rt.rt_gateway));
 192
 193         memset(&addr, 0, sizeof(addr));
 194         addr.sin_family = AF_INET;
 195         addr.sin_addr.s_addr = INADDR_ANY;
 196         memcpy(&rt.rt_genmask, &addr, sizeof(rt.rt_genmask));
 197
 198         err = ioctl(sk, SIOCADDRT, &rt);
 199         if (err < 0)
 200                 connman_error("Setting VPN route failed (%s)",
 201                                strerror(errno));
 202
 203         close(sk);
 204
 205         return err;
 206 }
 207
 208 static int del_route(struct connman_element *element, const char *gateway)
 209 {
 210         struct ifreq ifr;
 211         struct rtentry rt;
 212         struct sockaddr_in addr;
 213         int sk, err;
 214
 215         DBG("element %p", element);
 216
 217         sk = socket(PF_INET, SOCK_DGRAM, 0);
 218         if (sk < 0)
 219                 return -1;
 220
 221         memset(&ifr, 0, sizeof(ifr));
 222         ifr.ifr_ifindex = element->index;
 223
 224         if (ioctl(sk, SIOCGIFNAME, &ifr) < 0) {
 225                 close(sk);
 226                 return -1;
 227         }
 228
 229         DBG("ifname %s", ifr.ifr_name);
 230
 231         memset(&rt, 0, sizeof(rt));
 232         rt.rt_flags = RTF_UP | RTF_GATEWAY;
 233
 234         memset(&addr, 0, sizeof(addr));
 235         addr.sin_family = AF_INET;
 236         addr.sin_addr.s_addr = INADDR_ANY;
 237         memcpy(&rt.rt_dst, &addr, sizeof(rt.rt_dst));
 238
 239         memset(&addr, 0, sizeof(addr));
 240         addr.sin_family = AF_INET;
 241         addr.sin_addr.s_addr = inet_addr(gateway);
 242         memcpy(&rt.rt_gateway, &addr, sizeof(rt.rt_gateway));
 243
 244         memset(&addr, 0, sizeof(addr));
 245         addr.sin_family = AF_INET;
 246         addr.sin_addr.s_addr = INADDR_ANY;
 247         memcpy(&rt.rt_genmask, &addr, sizeof(rt.rt_genmask));
 248
 249         err = ioctl(sk, SIOCDELRT, &rt);
 250         if (err < 0)
 251                 connman_error("Removing default route failed (%s)",
 252                                                         strerror(errno));
 253
 254         close(sk);
 255
 256         return err;
 257 }
 258
 259 static int del_route_all(struct gateway_data *data)
 260 {
 261         int err = 0;
 262
 263         if (data->vpn) {
 264                 del_vpn_host(data->gateway);
 265
 266                 err = del_route(data->element, data->vpn_ip);
 267         } else
 268                 err = del_route(data->element, data->gateway);
 269
 270         return err;
 271 }
 272
 273 static void find_element(struct connman_element *element, gpointer user_data)
 274 {
 275         struct gateway_data *data = user_data;
 276
 277         DBG("element %p name %s", element, element->name);
 278
 279         if (data->element != NULL)
 280                 return;
 281
 282         if (element->index != data->index)
 283                 return;
 284
 285         data->element = element;
 286 }
 287
 288 static struct gateway_data *add_gateway(int index, const char *gateway)
 289 {
 290         struct gateway_data *data;
 291         struct connman_service *service;
 292
 293         data = g_try_new0(struct gateway_data, 1);
 294         if (data == NULL)
 295                 return NULL;
 296
 297         data->index = index;
 298         data->gateway = g_strdup(gateway);
 299         data->active = FALSE;
 300         data->element = NULL;
 301         data->vpn_ip = NULL;
 302         data->vpn = FALSE;
 303
 304         __connman_element_foreach(NULL, CONNMAN_ELEMENT_TYPE_CONNECTION,
 305                                                         find_element, data);
 306
 307         service = __connman_element_get_service(data->element);
 308         data->order = __connman_service_get_order(service);
 309
 310         gateway_list = g_slist_append(gateway_list, data);
 311
 312         return data;
 313 }
 314
 315 static void connection_newgateway(int index, const char *gateway)
 316 {
 317         struct gateway_data *data;
 318
 319         DBG("index %d gateway %s", index, gateway);
 320
 321         data = find_gateway(index, gateway);
 322         if (data == NULL)
 323                 return;
 324
 325         data->active = TRUE;
 326 }
 327
 328 static void set_default_gateway(struct gateway_data *data)
 329 {
 330         struct connman_element *element = data->element;
 331         struct connman_service *service = NULL;
 332         short int ifflags;
 333
 334         DBG("gateway %s", data->gateway);
 335
 336         if (data->vpn == TRUE) {
 337
 338                 set_vpn_route(element, data->vpn_ip);
 339                 /* vpn gateway going away no changes in services */
 340                 return;
 341         }
 342
 343         ifflags = connman_inet_ifflags(element->index);
 344         if (ifflags < 0) {
 345                 connman_error("Fail to get network interface flags");
 346                 return;
 347         }
 348
 349         if (ifflags & IFF_POINTOPOINT) {
 350                 if (connman_inet_set_gateway_interface(element->index) < 0)
 351                         return;
 352                 goto done;
 353         }
 354
 355         if (connman_inet_set_gateway_address(element->index, data->gateway) < 0)
 356                 return;
 357
 358 done:
 359         service = __connman_element_get_service(element);
 360         __connman_service_indicate_default(service);
 361 }
 362
 363 static struct gateway_data *find_default_gateway(void)
 364 {
 365         struct gateway_data *found = NULL;
 366         unsigned int order = 0;
 367         GSList *list;
 368
 369         for (list = gateway_list; list; list = list->next) {
 370                 struct gateway_data *data = list->data;
 371
 372                 if (found == NULL || data->order > order) {
 373                         found = data;
 374                         order = data->order;
 375                 }
 376         }
 377
 378         return found;
 379 }
 380
 381 static void remove_gateway(struct gateway_data *data)
 382 {
 383         DBG("gateway %s", data->gateway);
 384
 385         gateway_list = g_slist_remove(gateway_list, data);
 386
 387         if (data->active == TRUE)
 388                 del_route_all(data);
 389
 390         g_free(data->gateway);
 391         g_free(data->vpn_ip);
 392         g_free(data);
 393 }
 394
 395 static void connection_delgateway(int index, const char *gateway)
 396 {
 397         struct gateway_data *data;
 398
 399         DBG("index %d gateway %s", index, gateway);
 400
 401         data = find_gateway(index, gateway);
 402         if (data != NULL)
 403                 data->active = FALSE;
 404
 405         data = find_default_gateway();
 406         if (data != NULL)
 407                 set_default_gateway(data);
 408 }
 409
 410 static struct connman_rtnl connection_rtnl = {
 411         .name           = "connection",
 412         .newgateway     = connection_newgateway,
 413         .delgateway     = connection_delgateway,
 414 };
 415
 416 static struct gateway_data *find_active_gateway(void)
 417 {
 418         GSList *list;
 419
 420         DBG("");
 421
 422         for (list = gateway_list; list; list = list->next) {
 423                 struct gateway_data *data = list->data;
 424                 if (data->active == TRUE)
 425                         return data;
 426         }
 427
 428         return NULL;
 429 }
 430
 431 static int connection_probe(struct connman_element *element)
 432 {
 433         struct connman_service *service = NULL;
 434         const char *gateway = NULL;
 435         const char *vpn_ip = NULL;
 436         struct gateway_data *active_gateway = NULL;
 437         struct gateway_data *new_gateway = NULL;
 438
 439         DBG("element %p name %s", element, element->name);
 440
 441         if (element->parent == NULL)
 442                 return -ENODEV;
 443
 444         if (element->parent->type != CONNMAN_ELEMENT_TYPE_IPV4)
 445                 return -ENODEV;
 446
 447         connman_element_get_value(element,
 448                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 449
 450         connman_element_get_value(element,
 451                                   CONNMAN_PROPERTY_ID_IPV4_ADDRESS, &vpn_ip);
 452
 453         DBG("gateway %s", gateway);
 454
 455         service = __connman_element_get_service(element);
 456         __connman_service_indicate_state(service,
 457                                         CONNMAN_SERVICE_STATE_READY);
 458
 459         connman_element_set_enabled(element, TRUE);
 460
 461         if (gateway == NULL)
 462                 return 0;
 463
 464         active_gateway = find_active_gateway();
 465         new_gateway = add_gateway(element->index, gateway);
 466
 467         if (service == NULL) {
 468                 new_gateway->vpn = TRUE;
 469                 new_gateway->vpn_ip = g_strdup(vpn_ip);
 470                 /* make sure vpn gateway are at higher priority */
 471                 new_gateway->order = 10;
 472         } else
 473                 new_gateway->vpn = FALSE;
 474
 475         if (active_gateway == NULL) {
 476                 set_default_gateway(new_gateway);
 477                 return 0;
 478         }
 479
 480         if (new_gateway->vpn == TRUE) {
 481                 add_vpn_host(active_gateway->element,
 482                              active_gateway->gateway,
 483                              new_gateway->gateway);
 484
 485         }
 486
 487         if (new_gateway->order >= active_gateway->order) {
 488                 del_route_all(active_gateway);
 489                 return 0;
 490         }
 491
 492         return 0;
 493 }
 494
 495 static void connection_remove(struct connman_element *element)
 496 {
 497         struct connman_service *service;
 498         const char *gateway = NULL;
 499         struct gateway_data *data = NULL;
 500         gboolean set_default = FALSE;
 501
 502         DBG("element %p name %s", element, element->name);
 503
 504         service = __connman_element_get_service(element);
 505         __connman_service_indicate_state(service,
 506                                         CONNMAN_SERVICE_STATE_DISCONNECT);
 507
 508         connman_element_set_enabled(element, FALSE);
 509
 510         connman_element_get_value(element,
 511                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 512
 513         DBG("gateway %s", gateway);
 514
 515         if (gateway == NULL)
 516                 return;
 517
 518         data = find_gateway(element->index, gateway);
 519         if (data == NULL)
 520                 return;
 521
 522         set_default = data->vpn;
 523
 524         if (data->vpn == TRUE)
 525                 del_vpn_host(data->gateway);
 526
 527         remove_gateway(data);
 528
 529         /* with vpn this will be called after the network was deleted,
 530          * we need to call set_default here because we will not recieve any
 531          * gateway delete notification.
 532          */
 533         if (set_default) {
 534                 data = find_default_gateway();
 535                 if (data != NULL)
 536                         set_default_gateway(data);
 537         }
 538 }
 539
 540 static struct connman_driver connection_driver = {
 541         .name           = "connection",
 542         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 543         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 544         .probe          = connection_probe,
 545         .remove         = connection_remove,
 546 };
 547
 548 int __connman_connection_init(void)
 549 {
 550         DBG("");
 551
 552         if (connman_rtnl_register(&connection_rtnl) < 0)
 553                 connman_error("Failed to setup RTNL gateway driver");
 554
 555         return connman_driver_register(&connection_driver);
 556 }
 557
 558 void __connman_connection_cleanup(void)
 559 {
 560         GSList *list;
 561
 562         DBG("");
 563
 564         connman_driver_unregister(&connection_driver);
 565
 566         connman_rtnl_unregister(&connection_rtnl);
 567
 568         for (list = gateway_list; list; list = list->next) {
 569                 struct gateway_data *data = list->data;
 570
 571                 DBG("index %d gateway %s", data->index, data->gateway);
 572
 573                 g_free(data->gateway);
 574                 g_free(data);
 575                 list->data = NULL;
 576         }
 577
 578         g_slist_free(gateway_list);
 579         gateway_list = NULL;
 580 }
 581
 582 static void update_order(void)
 583 {
 584         GSList *list = NULL;
 585
 586         for (list = gateway_list; list; list = list->next) {
 587                 struct gateway_data *data = list->data;
 588                 struct connman_service *service;
 589
 590                 /* vpn gataway is not attached to a service. */
 591                 if (data->vpn)
 592                         continue;
 593
 594                 service = __connman_element_get_service(data->element);
 595                 data->order = __connman_service_get_order(service);
 596         }
 597 }
 598
 599 gboolean __connman_connection_update_gateway(void)
 600 {
 601         struct gateway_data *active_gateway, *default_gateway;
 602         gboolean updated = FALSE;
 603
 604         update_order();
 605
 606         active_gateway = find_active_gateway();
 607         default_gateway = find_default_gateway();
 608
 609         if (active_gateway && active_gateway != default_gateway) {
 610                 del_route_all(active_gateway);
 611                 updated = TRUE;
 612         }
 613
 614         return updated;
 615 }