src/charon/kernel/kernel_interface.c

   1 /*
   2  * Copyright (C) 2008 Tobias Brunner
   3  * Hochschule fuer Technik Rapperswil
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  *
  15  * $Id$
  16  */
  17
  18 #include "kernel_interface.h"
  19
  20 #include <pthread.h>
  21
  22 #include <daemon.h>
  23 #include <utils/linked_list.h>
  24 #include <utils/mutex.h>
  25
  26 typedef struct private_kernel_interface_t private_kernel_interface_t;
  27
  28 /**
  29  * Private data of a kernel_interface_t object.
  30  */
  31 struct private_kernel_interface_t {
  32
  33         /**
  34          * Public part of kernel_interface_t object.
  35          */
  36         kernel_interface_t public;
  37
  38         /**
  39          * list of registered ipsec kernel interfaces
  40          */
  41         linked_list_t *ipsec_interfaces;
  42
  43         /**
  44          * list of registered network kernel interfaces
  45          */
  46         linked_list_t *net_interfaces;
  47
  48         /**
  49          * ipsec interface
  50          */
  51         kernel_ipsec_t *ipsec;
  52
  53         /**
  54          * network interface
  55          */
  56         kernel_net_t *net;
  57
  58         /**
  59          * locking mutex
  60          */
  61         mutex_t *mutex;
  62 };
  63
  64 /**
  65  * Implementation of kernel_interface_t.get_spi
  66  */
  67 static status_t get_spi(private_kernel_interface_t *this, host_t *src, host_t *dst,
  68                                  protocol_id_t protocol, u_int32_t reqid, u_int32_t *spi)
  69 {
  70         return this->ipsec->get_spi(this->ipsec, src, dst, protocol, reqid, spi);
  71 }
  72
  73 /**
  74  * Implementation of kernel_interface_t.get_cpi
  75  */
  76 static status_t get_cpi(private_kernel_interface_t *this, host_t *src, host_t *dst,
  77                                         u_int32_t reqid, u_int16_t *cpi)
  78 {
  79         return this->ipsec->get_cpi(this->ipsec, src, dst, reqid, cpi);
  80 }
  81
  82 /**
  83  * Implementation of kernel_interface_t.add_sa
  84  */
  85 static status_t add_sa(private_kernel_interface_t *this, host_t *src, host_t *dst,
  86                                 u_int32_t spi, protocol_id_t protocol, u_int32_t reqid,
  87                                 u_int64_t expire_soft, u_int64_t expire_hard,
  88                                 u_int16_t enc_alg, chunk_t enc_key,
  89                                 u_int16_t int_alg, chunk_t int_key,
  90                                 ipsec_mode_t mode, u_int16_t ipcomp, u_int16_t cpi, bool encap,
  91                                 bool inbound)
  92 {
  93         return this->ipsec->add_sa(this->ipsec, src, dst, spi, protocol, reqid,
  94                         expire_soft, expire_hard, enc_alg, enc_key, int_alg, int_key,
  95                         mode, ipcomp, cpi, encap, inbound);
  96 }
  97
  98 /**
  99  * Implementation of kernel_interface_t.update_sa
 100  */
 101 static status_t update_sa(private_kernel_interface_t *this, u_int32_t spi,
 102                                    protocol_id_t protocol, u_int16_t cpi, host_t *src, host_t *dst,
 103                                    host_t *new_src, host_t *new_dst, bool encap, bool new_encap)
 104 {
 105         return this->ipsec->update_sa(this->ipsec, spi, protocol, cpi, src, dst,
 106                         new_src, new_dst, encap, new_encap);
 107 }
 108
 109 /**
 110  * Implementation of kernel_interface_t.del_sa
 111  */
 112 static status_t del_sa(private_kernel_interface_t *this, host_t *dst, u_int32_t spi,
 113                                 protocol_id_t protocol, u_int16_t cpi)
 114 {
 115         return this->ipsec->del_sa(this->ipsec, dst, spi, protocol, cpi);
 116 }
 117
 118 /**
 119  * Implementation of kernel_interface_t.add_policy
 120  */
 121 static status_t add_policy(private_kernel_interface_t *this, host_t *src, host_t *dst,
 122                                         traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
 123                                         policy_dir_t direction, u_int32_t spi, protocol_id_t protocol,
 124                                         u_int32_t reqid, ipsec_mode_t mode, u_int16_t ipcomp, u_int16_t cpi,
 125                                         bool routed)
 126 {
 127         return this->ipsec->add_policy(this->ipsec, src, dst, src_ts, dst_ts,
 128                         direction, spi, protocol, reqid, mode, ipcomp, cpi, routed);
 129 }
 130
 131 /**
 132  * Implementation of kernel_interface_t.query_policy
 133  */
 134 static status_t query_policy(private_kernel_interface_t *this,
 135                                           traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
 136                                           policy_dir_t direction, u_int32_t *use_time)
 137 {
 138         return this->ipsec->query_policy(this->ipsec, src_ts, dst_ts, direction, use_time);
 139 }
 140
 141 /**
 142  * Implementation of kernel_interface_t.del_policy
 143  */
 144 static status_t del_policy(private_kernel_interface_t *this,
 145                                         traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
 146                                         policy_dir_t direction, bool unrouted)
 147 {
 148         return this->ipsec->del_policy(this->ipsec, src_ts, dst_ts, direction, unrouted);
 149 }
 150
 151 /**
 152  * Implementation of kernel_interface_t.get_source_addr
 153  */
 154 static host_t *get_source_addr(private_kernel_interface_t *this,
 155                                                            host_t *dest, host_t *src)
 156 {
 157         return this->net->get_source_addr(this->net, dest, src);
 158 }
 159
 160 /**
 161  * Implementation of kernel_interface_t.get_nexthop
 162  */
 163 static host_t *get_nexthop(private_kernel_interface_t *this, host_t *dest)
 164 {
 165         return this->net->get_nexthop(this->net, dest);
 166 }
 167
 168 /**
 169  * Implementation of kernel_interface_t.get_interface
 170  */
 171 static char* get_interface(private_kernel_interface_t *this, host_t *host)
 172 {
 173         return this->net->get_interface(this->net, host);
 174 }
 175
 176 /**
 177  * Implementation of kernel_interface_t.create_address_enumerator
 178  */
 179 static enumerator_t *create_address_enumerator(private_kernel_interface_t *this,
 180                 bool include_down_ifaces, bool include_virtual_ips)
 181 {
 182         return this->net->create_address_enumerator(this->net, include_down_ifaces,
 183                         include_virtual_ips);
 184 }
 185
 186 /**
 187  * Implementation of kernel_interface_t.add_ip
 188  */
 189 static status_t add_ip(private_kernel_interface_t *this, host_t *virtual_ip,
 190                                 host_t *iface_ip)
 191 {
 192         return this->net->add_ip(this->net, virtual_ip, iface_ip);
 193 }
 194
 195 /**
 196  * Implementation of kernel_interface_t.del_ip
 197  */
 198 static status_t del_ip(private_kernel_interface_t *this, host_t *virtual_ip)
 199 {
 200         return this->net->del_ip(this->net, virtual_ip);
 201 }
 202
 203 /**
 204  * Implementation of kernel_interface_t.add_route
 205  */
 206 static status_t add_route(private_kernel_interface_t *this, chunk_t dst_net,
 207                 u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name)
 208 {
 209         return this->net->add_route(this->net, dst_net, prefixlen, gateway, src_ip,
 210                         if_name);
 211 }
 212
 213 /**
 214  * Implementation of kernel_interface_t.del_route
 215  */
 216 static status_t del_route(private_kernel_interface_t *this, chunk_t dst_net,
 217                 u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name)
 218 {
 219         return this->net->del_route(this->net, dst_net, prefixlen, gateway, src_ip,
 220                         if_name);
 221 }
 222
 223
 224 /**
 225  * Implementation of kernel_interface_t.get_address_by_ts
 226  */
 227 static status_t get_address_by_ts(private_kernel_interface_t *this,
 228                                                                   traffic_selector_t *ts, host_t **ip)
 229 {
 230         enumerator_t *addrs;
 231         host_t *host;
 232         int family;
 233         bool found = FALSE;
 234
 235         DBG2(DBG_KNL, "getting a local address in traffic selector %R", ts);
 236
 237         /* if we have a family which includes localhost, we do not
 238          * search for an IP, we use the default */
 239         family = ts->get_type(ts) == TS_IPV4_ADDR_RANGE ? AF_INET : AF_INET6;
 240
 241         if (family == AF_INET)
 242         {
 243                 host = host_create_from_string("127.0.0.1", 0);
 244         }
 245         else
 246         {
 247                 host = host_create_from_string("::1", 0);
 248         }
 249
 250         if (ts->includes(ts, host))
 251         {
 252                 *ip = host_create_any(family);
 253                 host->destroy(host);
 254                 DBG2(DBG_KNL, "using host %H", *ip);
 255                 return SUCCESS;
 256         }
 257         host->destroy(host);
 258
 259         addrs = this->public.create_address_enumerator(&this->public, TRUE, TRUE);
 260         while (addrs->enumerate(addrs, (void**)&host))
 261         {
 262                 if (ts->includes(ts, host))
 263                 {
 264                         found = TRUE;
 265                         *ip = host->clone(host);
 266                         break;
 267                 }
 268         }
 269         addrs->destroy(addrs);
 270
 271         if (!found)
 272         {
 273                 DBG1(DBG_KNL, "no local address found in traffic selector %R", ts);
 274                 return FAILED;
 275         }
 276
 277         DBG2(DBG_KNL, "using host %H", *ip);
 278         return SUCCESS;
 279 }
 280
 281
 282 /**
 283  * Implementation of kernel_interface_t.add_ipsec_interface.
 284  */
 285 static void add_ipsec_interface(private_kernel_interface_t *this,
 286                 kernel_ipsec_constructor_t *create)
 287 {
 288         this->mutex->lock(this->mutex);
 289         this->ipsec_interfaces->insert_last(this->ipsec_interfaces, create);
 290         this->mutex->unlock(this->mutex);
 291 }
 292
 293 /**
 294  * Implementation of kernel_interface_t.remove_ipsec_interface.
 295  */
 296 static void remove_ipsec_interface(private_kernel_interface_t *this,
 297                 kernel_ipsec_constructor_t *create)
 298 {
 299         this->mutex->lock(this->mutex);
 300         this->ipsec_interfaces->remove(this->ipsec_interfaces, create, NULL);
 301         this->mutex->unlock(this->mutex);
 302 }
 303
 304 /**
 305  * Implementation of kernel_interface_t.add_net_interface.
 306  */
 307 static void add_net_interface(private_kernel_interface_t *this,
 308                 kernel_net_constructor_t *create)
 309 {
 310         this->mutex->lock(this->mutex);
 311         this->net_interfaces->insert_last(this->net_interfaces, create);
 312         this->mutex->unlock(this->mutex);
 313 }
 314
 315 /**
 316  * Implementation of kernel_interface_t.remove_net_interface.
 317  */
 318 static void remove_net_interface(private_kernel_interface_t *this,
 319                 kernel_net_constructor_t *create)
 320 {
 321         this->mutex->lock(this->mutex);
 322         this->net_interfaces->remove(this->net_interfaces, create, NULL);
 323         this->mutex->unlock(this->mutex);
 324 }
 325
 326 /**
 327  * Implementation of kernel_interface_t.create_interfaces.
 328  */
 329 static void create_interfaces(private_kernel_interface_t *this)
 330 {
 331         kernel_ipsec_constructor_t create_ipsec;
 332         kernel_net_constructor_t create_net;
 333
 334         this->mutex->lock(this->mutex);
 335         if (this->ipsec_interfaces->get_first(this->ipsec_interfaces, (void**)&create_ipsec) != SUCCESS)
 336         {
 337                 this->mutex->unlock(this->mutex);
 338                 charon->kill(charon, "no ipsec kernel interface loaded");
 339         }
 340
 341         if (this->net_interfaces->get_first(this->net_interfaces, (void**)&create_net) != SUCCESS)
 342         {
 343                 this->mutex->unlock(this->mutex);
 344                 charon->kill(charon, "no network kernel interface loaded");
 345         }
 346         this->mutex->unlock(this->mutex);
 347
 348         this->ipsec = create_ipsec();
 349         this->net = create_net();
 350 }
 351
 352 /**
 353  * Implementation of kernel_interface_t.destroy.
 354  */
 355 static void destroy(private_kernel_interface_t *this)
 356 {
 357         DESTROY_IF(this->ipsec);
 358         DESTROY_IF(this->net);
 359         this->ipsec_interfaces->destroy(this->ipsec_interfaces);
 360         this->net_interfaces->destroy(this->net_interfaces);
 361         this->mutex->destroy(this->mutex);
 362         free(this);
 363 }
 364
 365 /*
 366  * Described in header-file
 367  */
 368 kernel_interface_t *kernel_interface_create()
 369 {
 370         private_kernel_interface_t *this = malloc_thing(private_kernel_interface_t);
 371
 372         this->public.get_spi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,protocol_id_t,u_int32_t,u_int32_t*))get_spi;
 373         this->public.get_cpi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,u_int32_t,u_int16_t*))get_cpi;
 374         this->public.add_sa  = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t,u_int64_t,u_int64_t,u_int16_t,chunk_t,u_int16_t,chunk_t,ipsec_mode_t,u_int16_t,u_int16_t,bool,bool))add_sa;
 375         this->public.update_sa = (status_t(*)(kernel_interface_t*,u_int32_t,protocol_id_t,u_int16_t,host_t*,host_t*,host_t*,host_t*,bool,bool))update_sa;
 376         this->public.del_sa = (status_t(*)(kernel_interface_t*,host_t*,u_int32_t,protocol_id_t,u_int16_t))del_sa;
 377         this->public.add_policy = (status_t(*)(kernel_interface_t*,host_t*,host_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,u_int32_t,protocol_id_t,u_int32_t,ipsec_mode_t,u_int16_t,u_int16_t,bool))add_policy;
 378         this->public.query_policy = (status_t(*)(kernel_interface_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,u_int32_t*))query_policy;
 379         this->public.del_policy = (status_t(*)(kernel_interface_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,bool))del_policy;
 380
 381         this->public.get_source_addr = (host_t*(*)(kernel_interface_t*, host_t *dest, host_t *src))get_source_addr;
 382         this->public.get_nexthop = (host_t*(*)(kernel_interface_t*, host_t *dest))get_nexthop;
 383         this->public.get_interface = (char*(*)(kernel_interface_t*,host_t*))get_interface;
 384         this->public.create_address_enumerator = (enumerator_t*(*)(kernel_interface_t*,bool,bool))create_address_enumerator;
 385         this->public.add_ip = (status_t(*)(kernel_interface_t*,host_t*,host_t*)) add_ip;
 386         this->public.del_ip = (status_t(*)(kernel_interface_t*,host_t*)) del_ip;
 387         this->public.add_route = (status_t(*)(kernel_interface_t*,chunk_t,u_int8_t,host_t*,host_t*,char*)) add_route;
 388         this->public.del_route = (status_t(*)(kernel_interface_t*,chunk_t,u_int8_t,host_t*,host_t*,char*)) del_route;
 389
 390         this->public.get_address_by_ts = (status_t(*)(kernel_interface_t*,traffic_selector_t*,host_t**))get_address_by_ts;
 391
 392         this->public.add_ipsec_interface = (void(*)(kernel_interface_t*, kernel_ipsec_constructor_t))add_ipsec_interface;
 393         this->public.remove_ipsec_interface = (void(*)(kernel_interface_t*, kernel_ipsec_constructor_t))remove_ipsec_interface;
 394         this->public.add_net_interface = (void(*)(kernel_interface_t*, kernel_net_constructor_t))add_net_interface;
 395         this->public.remove_net_interface = (void(*)(kernel_interface_t*, kernel_net_constructor_t))remove_net_interface;
 396
 397         this->public.create_interfaces = (void (*)(kernel_interface_t*))create_interfaces;
 398         this->public.destroy = (void (*)(kernel_interface_t*))destroy;
 399
 400         this->ipsec_interfaces = linked_list_create();
 401         this->net_interfaces = linked_list_create();
 402         this->mutex = mutex_create(MUTEX_RECURSIVE);
 403         this->ipsec = NULL;
 404         this->net = NULL;
 405
 406         return &this->public;
 407 }