src/libhydra/kernel/kernel_interface.c

   1 /*
   2  * Copyright (C) 2008-2012 Tobias Brunner
   3  * Hochschule fuer Technik Rapperswil
   4  * Copyright (C) 2010 Martin Willi
   5  * Copyright (C) 2010 revosec AG
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * for more details.
  16  */
  17
  18 /*
  19  * Copyright (c) 2012 Nanoteq Pty Ltd
  20  *
  21  * Permission is hereby granted, free of charge, to any person obtaining a copy
  22  * of this software and associated documentation files (the "Software"), to deal
  23  * in the Software without restriction, including without limitation the rights
  24  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  25  * copies of the Software, and to permit persons to whom the Software is
  26  * furnished to do so, subject to the following conditions:
  27  *
  28  * The above copyright notice and this permission notice shall be included in
  29  * all copies or substantial portions of the Software.
  30  *
  31  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  32  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  33  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  34  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  35  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  36  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  37  * THE SOFTWARE.
  38  */
  39
  40 #include "kernel_interface.h"
  41
  42 #include <hydra.h>
  43 #include <debug.h>
  44 #include <threading/mutex.h>
  45 #include <utils/linked_list.h>
  46
  47 typedef struct private_kernel_interface_t private_kernel_interface_t;
  48
  49 typedef struct kernel_algorithm_t kernel_algorithm_t;
  50
  51 /**
  52  * Mapping of IKE algorithms to kernel-specific algorithm identifiers
  53  */
  54 struct kernel_algorithm_t {
  55
  56         /**
  57          * Transform type of the algorithm
  58          */
  59         transform_type_t type;
  60
  61         /**
  62          * Identifier specified in IKE
  63          */
  64         u_int16_t ike;
  65
  66         /**
  67          * Identifier as defined in pfkeyv2.h
  68          */
  69         u_int16_t kernel;
  70
  71         /**
  72          * Name of the algorithm in linux crypto API
  73          */
  74         char *name;
  75 };
  76
  77 /**
  78  * Private data of a kernel_interface_t object.
  79  */
  80 struct private_kernel_interface_t {
  81
  82         /**
  83          * Public part of kernel_interface_t object.
  84          */
  85         kernel_interface_t public;
  86
  87         /**
  88          * Registered IPsec constructor
  89          */
  90         kernel_ipsec_constructor_t ipsec_constructor;
  91
  92         /**
  93          * Registered net constructor
  94          */
  95         kernel_net_constructor_t net_constructor;
  96
  97         /**
  98          * ipsec interface
  99          */
 100         kernel_ipsec_t *ipsec;
 101
 102         /**
 103          * network interface
 104          */
 105         kernel_net_t *net;
 106
 107         /**
 108          * mutex for listeners
 109          */
 110         mutex_t *mutex;
 111
 112         /**
 113          * list of registered listeners
 114          */
 115         linked_list_t *listeners;
 116
 117         /**
 118          * mutex for algorithm mappings
 119          */
 120         mutex_t *mutex_algs;
 121
 122         /**
 123          * List of algorithm mappings (kernel_algorithm_t*)
 124          */
 125         linked_list_t *algorithms;
 126
 127         /**
 128          * List of interface names to include or exclude (char*), NULL if interfaces
 129          * are not filtered
 130          */
 131         linked_list_t *ifaces_filter;
 132
 133         /**
 134          * TRUE to exclude interfaces listed in ifaces_filter, FALSE to consider
 135          * only those listed there
 136          */
 137         bool ifaces_exclude;
 138 };
 139
 140 METHOD(kernel_interface_t, get_spi, status_t,
 141         private_kernel_interface_t *this, host_t *src, host_t *dst,
 142         u_int8_t protocol, u_int32_t reqid, u_int32_t *spi)
 143 {
 144         if (!this->ipsec)
 145         {
 146                 return NOT_SUPPORTED;
 147         }
 148         return this->ipsec->get_spi(this->ipsec, src, dst, protocol, reqid, spi);
 149 }
 150
 151 METHOD(kernel_interface_t, get_cpi, status_t,
 152         private_kernel_interface_t *this, host_t *src, host_t *dst,
 153         u_int32_t reqid, u_int16_t *cpi)
 154 {
 155         if (!this->ipsec)
 156         {
 157                 return NOT_SUPPORTED;
 158         }
 159         return this->ipsec->get_cpi(this->ipsec, src, dst, reqid, cpi);
 160 }
 161
 162 METHOD(kernel_interface_t, add_sa, status_t,
 163         private_kernel_interface_t *this, host_t *src, host_t *dst,
 164         u_int32_t spi, u_int8_t protocol, u_int32_t reqid, mark_t mark,
 165         u_int32_t tfc, lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key,
 166         u_int16_t int_alg, chunk_t int_key,     ipsec_mode_t mode, u_int16_t ipcomp,
 167         u_int16_t cpi, bool encap, bool esn, bool inbound,
 168         traffic_selector_t *src_ts, traffic_selector_t *dst_ts)
 169 {
 170         if (!this->ipsec)
 171         {
 172                 return NOT_SUPPORTED;
 173         }
 174         return this->ipsec->add_sa(this->ipsec, src, dst, spi, protocol, reqid,
 175                         mark, tfc, lifetime, enc_alg, enc_key, int_alg, int_key, mode,
 176                         ipcomp, cpi, encap, esn, inbound, src_ts, dst_ts);
 177 }
 178
 179 METHOD(kernel_interface_t, update_sa, status_t,
 180         private_kernel_interface_t *this, u_int32_t spi, u_int8_t protocol,
 181         u_int16_t cpi, host_t *src, host_t *dst, host_t *new_src, host_t *new_dst,
 182         bool encap, bool new_encap, mark_t mark)
 183 {
 184         if (!this->ipsec)
 185         {
 186                 return NOT_SUPPORTED;
 187         }
 188         return this->ipsec->update_sa(this->ipsec, spi, protocol, cpi, src, dst,
 189                                                                   new_src, new_dst, encap, new_encap, mark);
 190 }
 191
 192 METHOD(kernel_interface_t, query_sa, status_t,
 193         private_kernel_interface_t *this, host_t *src, host_t *dst,
 194         u_int32_t spi, u_int8_t protocol, mark_t mark, u_int64_t *bytes)
 195 {
 196         if (!this->ipsec)
 197         {
 198                 return NOT_SUPPORTED;
 199         }
 200         return this->ipsec->query_sa(this->ipsec, src, dst, spi, protocol, mark, bytes);
 201 }
 202
 203 METHOD(kernel_interface_t, del_sa, status_t,
 204         private_kernel_interface_t *this, host_t *src, host_t *dst, u_int32_t spi,
 205         u_int8_t protocol, u_int16_t cpi, mark_t mark)
 206 {
 207         if (!this->ipsec)
 208         {
 209                 return NOT_SUPPORTED;
 210         }
 211         return this->ipsec->del_sa(this->ipsec, src, dst, spi, protocol, cpi, mark);
 212 }
 213
 214 METHOD(kernel_interface_t, flush_sas, status_t,
 215         private_kernel_interface_t *this)
 216 {
 217         if (!this->ipsec)
 218         {
 219                 return NOT_SUPPORTED;
 220         }
 221         return this->ipsec->flush_sas(this->ipsec);
 222 }
 223
 224 METHOD(kernel_interface_t, add_policy, status_t,
 225         private_kernel_interface_t *this, host_t *src, host_t *dst,
 226         traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
 227         policy_dir_t direction, policy_type_t type, ipsec_sa_cfg_t *sa,
 228         mark_t mark, policy_priority_t priority)
 229 {
 230         if (!this->ipsec)
 231         {
 232                 return NOT_SUPPORTED;
 233         }
 234         return this->ipsec->add_policy(this->ipsec, src, dst, src_ts, dst_ts,
 235                                                                    direction, type, sa, mark, priority);
 236 }
 237
 238 METHOD(kernel_interface_t, query_policy, status_t,
 239         private_kernel_interface_t *this, traffic_selector_t *src_ts,
 240         traffic_selector_t *dst_ts, policy_dir_t direction, mark_t mark,
 241         u_int32_t *use_time)
 242 {
 243         if (!this->ipsec)
 244         {
 245                 return NOT_SUPPORTED;
 246         }
 247         return this->ipsec->query_policy(this->ipsec, src_ts, dst_ts,
 248                                                                          direction, mark, use_time);
 249 }
 250
 251 METHOD(kernel_interface_t, del_policy, status_t,
 252         private_kernel_interface_t *this, traffic_selector_t *src_ts,
 253         traffic_selector_t *dst_ts, policy_dir_t direction, u_int32_t reqid,
 254         mark_t mark, policy_priority_t priority)
 255 {
 256         if (!this->ipsec)
 257         {
 258                 return NOT_SUPPORTED;
 259         }
 260         return this->ipsec->del_policy(this->ipsec, src_ts, dst_ts,
 261                                                                    direction, reqid, mark, priority);
 262 }
 263
 264 METHOD(kernel_interface_t, flush_policies, status_t,
 265         private_kernel_interface_t *this)
 266 {
 267         if (!this->ipsec)
 268         {
 269                 return NOT_SUPPORTED;
 270         }
 271         return this->ipsec->flush_policies(this->ipsec);
 272 }
 273
 274 METHOD(kernel_interface_t, get_source_addr, host_t*,
 275         private_kernel_interface_t *this, host_t *dest, host_t *src)
 276 {
 277         if (!this->net)
 278         {
 279                 return NULL;
 280         }
 281         return this->net->get_source_addr(this->net, dest, src);
 282 }
 283
 284 METHOD(kernel_interface_t, get_nexthop, host_t*,
 285         private_kernel_interface_t *this, host_t *dest, host_t *src)
 286 {
 287         if (!this->net)
 288         {
 289                 return NULL;
 290         }
 291         return this->net->get_nexthop(this->net, dest, src);
 292 }
 293
 294 METHOD(kernel_interface_t, get_interface, bool,
 295         private_kernel_interface_t *this, host_t *host, char **name)
 296 {
 297         if (!this->net)
 298         {
 299                 return NULL;
 300         }
 301         return this->net->get_interface(this->net, host, name);
 302 }
 303
 304 METHOD(kernel_interface_t, create_address_enumerator, enumerator_t*,
 305         private_kernel_interface_t *this, bool include_down_ifaces,
 306         bool include_virtual_ips, bool include_loopback)
 307 {
 308         if (!this->net)
 309         {
 310                 return enumerator_create_empty();
 311         }
 312         return this->net->create_address_enumerator(this->net, include_down_ifaces,
 313                                                                                 include_virtual_ips, include_loopback);
 314 }
 315
 316 METHOD(kernel_interface_t, add_ip, status_t,
 317         private_kernel_interface_t *this, host_t *virtual_ip, host_t *iface_ip)
 318 {
 319         if (!this->net)
 320         {
 321                 return NOT_SUPPORTED;
 322         }
 323         return this->net->add_ip(this->net, virtual_ip, iface_ip);
 324 }
 325
 326 METHOD(kernel_interface_t, del_ip, status_t,
 327         private_kernel_interface_t *this, host_t *virtual_ip)
 328 {
 329         if (!this->net)
 330         {
 331                 return NOT_SUPPORTED;
 332         }
 333         return this->net->del_ip(this->net, virtual_ip);
 334 }
 335
 336 METHOD(kernel_interface_t, add_route, status_t,
 337         private_kernel_interface_t *this, chunk_t dst_net,
 338         u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name)
 339 {
 340         if (!this->net)
 341         {
 342                 return NOT_SUPPORTED;
 343         }
 344         return this->net->add_route(this->net, dst_net, prefixlen, gateway,
 345                                                                 src_ip, if_name);
 346 }
 347
 348 METHOD(kernel_interface_t, del_route, status_t,
 349         private_kernel_interface_t *this, chunk_t dst_net,
 350         u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name)
 351 {
 352         if (!this->net)
 353         {
 354                 return NOT_SUPPORTED;
 355         }
 356         return this->net->del_route(this->net, dst_net, prefixlen, gateway,
 357                                                                 src_ip, if_name);
 358 }
 359
 360 METHOD(kernel_interface_t, bypass_socket, bool,
 361         private_kernel_interface_t *this, int fd, int family)
 362 {
 363         if (!this->ipsec)
 364         {
 365                 return FALSE;
 366         }
 367         return this->ipsec->bypass_socket(this->ipsec, fd, family);
 368 }
 369
 370 METHOD(kernel_interface_t, enable_udp_decap, bool,
 371         private_kernel_interface_t *this, int fd, int family, u_int16_t port)
 372 {
 373         if (!this->ipsec)
 374         {
 375                 return FALSE;
 376         }
 377         return this->ipsec->enable_udp_decap(this->ipsec, fd, family, port);
 378 }
 379
 380 METHOD(kernel_interface_t, is_interface_usable, bool,
 381         private_kernel_interface_t *this, const char *iface)
 382 {
 383         status_t expected;
 384
 385         if (!this->ifaces_filter)
 386         {
 387                 return TRUE;
 388         }
 389         expected = this->ifaces_exclude ? NOT_FOUND : SUCCESS;
 390         return this->ifaces_filter->find_first(this->ifaces_filter, (void*)streq,
 391                                                                                    NULL, iface) == expected;
 392 }
 393
 394 METHOD(kernel_interface_t, get_address_by_ts, status_t,
 395         private_kernel_interface_t *this, traffic_selector_t *ts, host_t **ip)
 396 {
 397         enumerator_t *addrs;
 398         host_t *host;
 399         int family;
 400         bool found = FALSE;
 401
 402         DBG2(DBG_KNL, "getting a local address in traffic selector %R", ts);
 403
 404         /* if we have a family which includes localhost, we do not
 405          * search for an IP, we use the default */
 406         family = ts->get_type(ts) == TS_IPV4_ADDR_RANGE ? AF_INET : AF_INET6;
 407
 408         if (family == AF_INET)
 409         {
 410                 host = host_create_from_string("127.0.0.1", 0);
 411         }
 412         else
 413         {
 414                 host = host_create_from_string("::1", 0);
 415         }
 416
 417         if (ts->includes(ts, host))
 418         {
 419                 *ip = host_create_any(family);
 420                 host->destroy(host);
 421                 DBG2(DBG_KNL, "using host %H", *ip);
 422                 return SUCCESS;
 423         }
 424         host->destroy(host);
 425
 426         addrs = create_address_enumerator(this, TRUE, TRUE, TRUE);
 427         while (addrs->enumerate(addrs, (void**)&host))
 428         {
 429                 if (ts->includes(ts, host))
 430                 {
 431                         found = TRUE;
 432                         *ip = host->clone(host);
 433                         break;
 434                 }
 435         }
 436         addrs->destroy(addrs);
 437
 438         if (!found)
 439         {
 440                 DBG2(DBG_KNL, "no local address found in traffic selector %R", ts);
 441                 return FAILED;
 442         }
 443
 444         DBG2(DBG_KNL, "using host %H", *ip);
 445         return SUCCESS;
 446 }
 447
 448
 449 METHOD(kernel_interface_t, add_ipsec_interface, void,
 450         private_kernel_interface_t *this, kernel_ipsec_constructor_t constructor)
 451 {
 452         if (!this->ipsec)
 453         {
 454                 this->ipsec_constructor = constructor;
 455                 this->ipsec = constructor();
 456         }
 457 }
 458
 459 METHOD(kernel_interface_t, remove_ipsec_interface, void,
 460         private_kernel_interface_t *this, kernel_ipsec_constructor_t constructor)
 461 {
 462         if (constructor == this->ipsec_constructor && this->ipsec)
 463         {
 464                 this->ipsec->destroy(this->ipsec);
 465                 this->ipsec = NULL;
 466         }
 467 }
 468
 469 METHOD(kernel_interface_t, add_net_interface, void,
 470         private_kernel_interface_t *this, kernel_net_constructor_t constructor)
 471 {
 472         if (!this->net)
 473         {
 474                 this->net_constructor = constructor;
 475                 this->net = constructor();
 476         }
 477 }
 478
 479 METHOD(kernel_interface_t, remove_net_interface, void,
 480         private_kernel_interface_t *this, kernel_net_constructor_t constructor)
 481 {
 482         if (constructor == this->net_constructor && this->net)
 483         {
 484                 this->net->destroy(this->net);
 485                 this->net = NULL;
 486         }
 487 }
 488
 489 METHOD(kernel_interface_t, add_listener, void,
 490         private_kernel_interface_t *this, kernel_listener_t *listener)
 491 {
 492         this->mutex->lock(this->mutex);
 493         this->listeners->insert_last(this->listeners, listener);
 494         this->mutex->unlock(this->mutex);
 495 }
 496
 497 METHOD(kernel_interface_t, remove_listener, void,
 498         private_kernel_interface_t *this, kernel_listener_t *listener)
 499 {
 500         this->mutex->lock(this->mutex);
 501         this->listeners->remove(this->listeners, listener, NULL);
 502         this->mutex->unlock(this->mutex);
 503 }
 504
 505 METHOD(kernel_interface_t, acquire, void,
 506         private_kernel_interface_t *this, u_int32_t reqid,
 507         traffic_selector_t *src_ts, traffic_selector_t *dst_ts)
 508 {
 509         kernel_listener_t *listener;
 510         enumerator_t *enumerator;
 511         this->mutex->lock(this->mutex);
 512         enumerator = this->listeners->create_enumerator(this->listeners);
 513         while (enumerator->enumerate(enumerator, &listener))
 514         {
 515                 if (listener->acquire &&
 516                         !listener->acquire(listener, reqid, src_ts, dst_ts))
 517                 {
 518                         this->listeners->remove_at(this->listeners, enumerator);
 519                 }
 520         }
 521         enumerator->destroy(enumerator);
 522         this->mutex->unlock(this->mutex);
 523 }
 524
 525 METHOD(kernel_interface_t, expire, void,
 526         private_kernel_interface_t *this, u_int32_t reqid, u_int8_t protocol,
 527         u_int32_t spi, bool hard)
 528 {
 529         kernel_listener_t *listener;
 530         enumerator_t *enumerator;
 531         this->mutex->lock(this->mutex);
 532         enumerator = this->listeners->create_enumerator(this->listeners);
 533         while (enumerator->enumerate(enumerator, &listener))
 534         {
 535                 if (listener->expire &&
 536                         !listener->expire(listener, reqid, protocol, spi, hard))
 537                 {
 538                         this->listeners->remove_at(this->listeners, enumerator);
 539                 }
 540         }
 541         enumerator->destroy(enumerator);
 542         this->mutex->unlock(this->mutex);
 543 }
 544
 545 METHOD(kernel_interface_t, mapping, void,
 546         private_kernel_interface_t *this, u_int32_t reqid, u_int32_t spi,
 547         host_t *remote)
 548 {
 549         kernel_listener_t *listener;
 550         enumerator_t *enumerator;
 551         this->mutex->lock(this->mutex);
 552         enumerator = this->listeners->create_enumerator(this->listeners);
 553         while (enumerator->enumerate(enumerator, &listener))
 554         {
 555                 if (listener->mapping &&
 556                         !listener->mapping(listener, reqid, spi, remote))
 557                 {
 558                         this->listeners->remove_at(this->listeners, enumerator);
 559                 }
 560         }
 561         enumerator->destroy(enumerator);
 562         this->mutex->unlock(this->mutex);
 563 }
 564
 565 METHOD(kernel_interface_t, migrate, void,
 566         private_kernel_interface_t *this, u_int32_t reqid,
 567         traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
 568         policy_dir_t direction, host_t *local, host_t *remote)
 569 {
 570         kernel_listener_t *listener;
 571         enumerator_t *enumerator;
 572         this->mutex->lock(this->mutex);
 573         enumerator = this->listeners->create_enumerator(this->listeners);
 574         while (enumerator->enumerate(enumerator, &listener))
 575         {
 576                 if (listener->migrate &&
 577                         !listener->migrate(listener, reqid, src_ts, dst_ts, direction,
 578                                                            local, remote))
 579                 {
 580                         this->listeners->remove_at(this->listeners, enumerator);
 581                 }
 582         }
 583         enumerator->destroy(enumerator);
 584         this->mutex->unlock(this->mutex);
 585 }
 586
 587 static bool call_roam(kernel_listener_t *listener, bool *roam)
 588 {
 589         return listener->roam && !listener->roam(listener, *roam);
 590 }
 591
 592 METHOD(kernel_interface_t, roam, void,
 593         private_kernel_interface_t *this, bool address)
 594 {
 595         this->mutex->lock(this->mutex);
 596         this->listeners->remove(this->listeners, &address, (void*)call_roam);
 597         this->mutex->unlock(this->mutex);
 598 }
 599
 600 METHOD(kernel_interface_t, register_algorithm, void,
 601         private_kernel_interface_t *this, u_int16_t alg_id, transform_type_t type,
 602         u_int16_t kernel_id, char *kernel_name)
 603 {
 604         kernel_algorithm_t *algorithm;
 605
 606         INIT(algorithm,
 607                 .type = type,
 608                 .ike = alg_id,
 609                 .kernel = kernel_id,
 610                 .name = strdup(kernel_name),
 611         );
 612
 613         this->mutex_algs->lock(this->mutex_algs);
 614         this->algorithms->insert_first(this->algorithms, algorithm);
 615         this->mutex_algs->unlock(this->mutex_algs);
 616 }
 617
 618 METHOD(kernel_interface_t, lookup_algorithm, bool,
 619         private_kernel_interface_t *this, u_int16_t alg_id, transform_type_t type,
 620         u_int16_t *kernel_id, char **kernel_name)
 621 {
 622         kernel_algorithm_t *algorithm;
 623         enumerator_t *enumerator;
 624         bool found = FALSE;
 625
 626         this->mutex_algs->lock(this->mutex_algs);
 627         enumerator = this->algorithms->create_enumerator(this->algorithms);
 628         while (enumerator->enumerate(enumerator, &algorithm))
 629         {
 630                 if (algorithm->type == type && algorithm->ike == alg_id)
 631                 {
 632                         if (kernel_id)
 633                         {
 634                                 *kernel_id = algorithm->kernel;
 635                         }
 636                         if (kernel_name)
 637                         {
 638                                 *kernel_name = algorithm->name;
 639                         }
 640                         found = TRUE;
 641                         break;
 642                 }
 643         }
 644         enumerator->destroy(enumerator);
 645         this->mutex_algs->unlock(this->mutex_algs);
 646         return found;
 647 }
 648
 649 METHOD(kernel_interface_t, destroy, void,
 650         private_kernel_interface_t *this)
 651 {
 652         kernel_algorithm_t *algorithm;
 653
 654         while (this->algorithms->remove_first(this->algorithms,
 655                                                                                  (void**)&algorithm) == SUCCESS)
 656         {
 657                 free(algorithm->name);
 658                 free(algorithm);
 659         }
 660         this->algorithms->destroy(this->algorithms);
 661         this->mutex_algs->destroy(this->mutex_algs);
 662         DESTROY_IF(this->ipsec);
 663         DESTROY_IF(this->net);
 664         DESTROY_FUNCTION_IF(this->ifaces_filter, (void*)free);
 665         this->listeners->destroy(this->listeners);
 666         this->mutex->destroy(this->mutex);
 667         free(this);
 668 }
 669
 670 /*
 671  * Described in header-file
 672  */
 673 kernel_interface_t *kernel_interface_create()
 674 {
 675         private_kernel_interface_t *this;
 676         char *ifaces;
 677
 678         INIT(this,
 679                 .public = {
 680                         .get_spi = _get_spi,
 681                         .get_cpi = _get_cpi,
 682                         .add_sa = _add_sa,
 683                         .update_sa = _update_sa,
 684                         .query_sa = _query_sa,
 685                         .del_sa = _del_sa,
 686                         .flush_sas = _flush_sas,
 687                         .add_policy = _add_policy,
 688                         .query_policy = _query_policy,
 689                         .del_policy = _del_policy,
 690                         .flush_policies = _flush_policies,
 691                         .get_source_addr = _get_source_addr,
 692                         .get_nexthop = _get_nexthop,
 693                         .get_interface = _get_interface,
 694                         .create_address_enumerator = _create_address_enumerator,
 695                         .add_ip = _add_ip,
 696                         .del_ip = _del_ip,
 697                         .add_route = _add_route,
 698                         .del_route = _del_route,
 699                         .bypass_socket = _bypass_socket,
 700                         .enable_udp_decap = _enable_udp_decap,
 701
 702                         .is_interface_usable = _is_interface_usable,
 703                         .get_address_by_ts = _get_address_by_ts,
 704                         .add_ipsec_interface = _add_ipsec_interface,
 705                         .remove_ipsec_interface = _remove_ipsec_interface,
 706                         .add_net_interface = _add_net_interface,
 707                         .remove_net_interface = _remove_net_interface,
 708
 709                         .add_listener = _add_listener,
 710                         .remove_listener = _remove_listener,
 711                         .register_algorithm = _register_algorithm,
 712                         .lookup_algorithm = _lookup_algorithm,
 713                         .acquire = _acquire,
 714                         .expire = _expire,
 715                         .mapping = _mapping,
 716                         .migrate = _migrate,
 717                         .roam = _roam,
 718                         .destroy = _destroy,
 719                 },
 720                 .mutex = mutex_create(MUTEX_TYPE_DEFAULT),
 721                 .listeners = linked_list_create(),
 722                 .mutex_algs = mutex_create(MUTEX_TYPE_DEFAULT),
 723                 .algorithms = linked_list_create(),
 724         );
 725
 726         ifaces = lib->settings->get_str(lib->settings,
 727                                         "%s.interfaces_use", NULL, hydra->daemon);
 728         if (!ifaces)
 729         {
 730                 ifaces = lib->settings->get_str(lib->settings,
 731                                         "%s.interfaces_ignore", NULL, hydra->daemon);
 732                 if (ifaces)
 733                 {
 734                         this->ifaces_exclude = TRUE;
 735                 }
 736         }
 737         if (ifaces)
 738         {
 739                 enumerator_t *enumerator;
 740                 char *iface;
 741
 742                 enumerator = enumerator_create_token(ifaces, ",", " ");
 743                 while (enumerator->enumerate(enumerator, &iface))
 744                 {
 745                         if (!this->ifaces_filter)
 746                         {
 747                                 this->ifaces_filter = linked_list_create();
 748                         }
 749                         this->ifaces_filter->insert_last(this->ifaces_filter,
 750                                                                                          strdup(iface));
 751                 }
 752                 enumerator->destroy(enumerator);
 753         }
 754
 755         return &this->public;
 756 }
 757