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Annotation of embedaddon/strongswan/src/libcharon/plugins/kernel_libipsec/kernel_libipsec_plugin.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2012-2013 Tobias Brunner
                      3:  * HSR 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: 
                     16: #include "kernel_libipsec_plugin.h"
                     17: #include "kernel_libipsec_ipsec.h"
                     18: #include "kernel_libipsec_router.h"
                     19: 
                     20: #include <daemon.h>
                     21: #include <ipsec.h>
                     22: #include <networking/tun_device.h>
                     23: 
                     24: #define TUN_DEFAULT_MTU 1400
                     25: 
                     26: typedef struct private_kernel_libipsec_plugin_t private_kernel_libipsec_plugin_t;
                     27: 
                     28: /**
                     29:  * private data of "kernel" libipsec plugin
                     30:  */
                     31: struct private_kernel_libipsec_plugin_t {
                     32: 
                     33:        /**
                     34:         * implements plugin interface
                     35:         */
                     36:        kernel_libipsec_plugin_t public;
                     37: 
                     38:        /**
                     39:         * TUN device created by this plugin
                     40:         */
                     41:        tun_device_t *tun;
                     42: 
                     43:        /**
                     44:         * Packet router
                     45:         */
                     46:        kernel_libipsec_router_t *router;
                     47: };
                     48: 
                     49: METHOD(plugin_t, get_name, char*,
                     50:        private_kernel_libipsec_plugin_t *this)
                     51: {
                     52:        return "kernel-libipsec";
                     53: }
                     54: 
                     55: /**
                     56:  * Create the kernel_libipsec_router_t instance
                     57:  */
                     58: static bool create_router(private_kernel_libipsec_plugin_t *this,
                     59:                                                  plugin_feature_t *feature, bool reg, void *arg)
                     60: {
                     61:        if (reg)
                     62:        {       /* registers as packet handler etc. */
                     63:                this->router = kernel_libipsec_router_create();
                     64:        }
                     65:        else
                     66:        {
                     67:                DESTROY_IF(this->router);
                     68:        }
                     69:        return TRUE;
                     70: }
                     71: 
                     72: METHOD(plugin_t, get_features, int,
                     73:        private_kernel_libipsec_plugin_t *this, plugin_feature_t *features[])
                     74: {
                     75:        static plugin_feature_t f[] = {
                     76:                PLUGIN_CALLBACK(kernel_ipsec_register, kernel_libipsec_ipsec_create),
                     77:                        PLUGIN_PROVIDE(CUSTOM, "kernel-ipsec"),
                     78:                PLUGIN_CALLBACK((plugin_feature_callback_t)create_router, NULL),
                     79:                        PLUGIN_PROVIDE(CUSTOM, "kernel-libipsec-router"),
                     80:                                PLUGIN_DEPENDS(CUSTOM, "libcharon-receiver"),
                     81:        };
                     82:        *features = f;
                     83:        return countof(f);
                     84: }
                     85: 
                     86: METHOD(plugin_t, destroy, void,
                     87:        private_kernel_libipsec_plugin_t *this)
                     88: {
                     89:        if (this->tun)
                     90:        {
                     91:                lib->set(lib, "kernel-libipsec-tun", NULL);
                     92:                this->tun->destroy(this->tun);
                     93:        }
                     94:        libipsec_deinit();
                     95:        free(this);
                     96: }
                     97: 
                     98: /*
                     99:  * see header file
                    100:  */
                    101: plugin_t *kernel_libipsec_plugin_create()
                    102: {
                    103:        private_kernel_libipsec_plugin_t *this;
                    104: 
                    105:        if (!lib->caps->check(lib->caps, CAP_NET_ADMIN))
                    106:        {       /* required to create TUN devices */
                    107:                DBG1(DBG_KNL, "kernel-libipsec plugin requires CAP_NET_ADMIN "
                    108:                         "capability");
                    109:                return NULL;
                    110:        }
                    111: 
                    112:        INIT(this,
                    113:                .public = {
                    114:                        .plugin = {
                    115:                                .get_name = _get_name,
                    116:                                .get_features = _get_features,
                    117:                                .destroy = _destroy,
                    118:                        },
                    119:                },
                    120:        );
                    121: 
                    122:        if (!libipsec_init())
                    123:        {
                    124:                DBG1(DBG_LIB, "initialization of libipsec failed");
                    125:                destroy(this);
                    126:                return NULL;
                    127:        }
                    128: 
                    129:        this->tun = tun_device_create("ipsec%d");
                    130:        if (!this->tun)
                    131:        {
                    132:                DBG1(DBG_KNL, "failed to create TUN device");
                    133:                destroy(this);
                    134:                return NULL;
                    135:        }
                    136:        if (!this->tun->set_mtu(this->tun, TUN_DEFAULT_MTU) ||
                    137:                !this->tun->up(this->tun))
                    138:        {
                    139:                DBG1(DBG_KNL, "failed to configure TUN device");
                    140:                destroy(this);
                    141:                return NULL;
                    142:        }
                    143:        lib->set(lib, "kernel-libipsec-tun", this->tun);
                    144: 
                    145:        /* set TUN device as default to install VIPs */
                    146:        lib->settings->set_str(lib->settings, "%s.install_virtual_ip_on",
                    147:                                                   this->tun->get_name(this->tun), lib->ns);
                    148:        return &this->public.plugin;
                    149: }