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strongswan/src/charon/threads/kernel_interface.c

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/**
* @file kernel_interface.c
*
* @brief Implementation of kernel_interface_t.
*
*/
/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* Hochschule fuer Technik Rapperswil
* Copyright (C) 2003 Herbert Xu.
*
* Contains modified parts from pluto.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <pthread.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include "kernel_interface.h"
#include <daemon.h>
#include <utils/linked_list.h>
#include <queues/jobs/delete_child_sa_job.h>
#include <queues/jobs/rekey_child_sa_job.h>
#define KERNEL_ESP 50
#define KERNEL_AH 51
#define SPD_PRIORITY 1024
#define XFRM_DATA_LENGTH 512
typedef struct xfrm_data_t xfrm_data_t;
/**
* Lenght/Type/data struct for userdata in xfrm
* We dont use the "I-don't-know-where-they-come-from"-structs
* used in the kernel.
*/
struct xfrm_data_t {
/**
* length of the data
*/
u_int16_t length;
/**
* type of data
*/
u_int16_t type;
/**
* and the data itself, for different purposes
*/
union {
/** algorithm */
struct xfrm_algo algo;
/** policy tmpl */
struct xfrm_user_tmpl tmpl[2];
};
};
typedef struct netlink_message_t netlink_message_t;
/**
* Representation of ANY netlink message used
*/
struct netlink_message_t {
/**
* header of the netlink message
*/
struct nlmsghdr hdr;
union {
/** error message */
struct nlmsgerr e;
/** message for spi allocation */
struct xfrm_userspi_info spi;
/** message for SA manipulation */
struct xfrm_usersa_id sa_id;
/** message for SA installation */
struct xfrm_usersa_info sa;
/** message for policy manipulation */
struct xfrm_userpolicy_id policy_id;
/** message for policy installation */
struct xfrm_userpolicy_info policy;
/** expire message sent from kernel */
struct xfrm_user_expire expire;
};
u_int8_t data[XFRM_DATA_LENGTH];
};
typedef struct private_kernel_interface_t private_kernel_interface_t;
/**
* @brief Private Variables and Functions of kernel_interface class.
*
*/
struct private_kernel_interface_t {
/**
* Public part of the kernel_interface_t object.
*/
kernel_interface_t public;
/**
* Netlink communication socket.
*/
int socket;
/**
* Process id of kernel thread
*/
pid_t pid;
/**
* Sequence number for messages.
*/
u_int32_t seq;
/**
* List of responded messages.
*/
linked_list_t *responses;
/**
* Thread which receives messages.
*/
pthread_t thread;
/**
* Mutex locks access to replies list.
*/
pthread_mutex_t mutex;
/**
* Condvar allows signaling of threads waiting for a reply.
*/
pthread_cond_t condvar;
/**
* Logger for XFRM stuff
*/
logger_t *logger;
/**
* Function for the thread, receives messages.
*/
void (*receive_messages) (private_kernel_interface_t *this);
/**
* Sends a netlink_message_t down to the kernel and wait for reply.
*/
status_t (*send_message) (private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t **response);
};
/**
* In the kernel, algorithms are identified as strings, we use our
* mapping functions...
* Algorithms for encryption.
* TODO: Add missing algorithm strings
*/
mapping_t kernel_encryption_algs_m[] = {
{ENCR_DES_IV64, ""},
{ENCR_DES, "des"},
{ENCR_3DES, "des3_ede"},
{ENCR_RC5, ""},
{ENCR_IDEA, "idea"},
{ENCR_CAST, "cast128"},
{ENCR_BLOWFISH, "blowfish"},
{ENCR_3IDEA, ""},
{ENCR_DES_IV32, ""},
{ENCR_NULL, ""},
{ENCR_AES_CBC, "aes"},
{ENCR_AES_CTR, ""},
{MAPPING_END, NULL}
};
/**
* In the kernel, algorithms are identified as strings, we use our
* mapping functions...
* Algorithms for integrity protection.
* TODO: Add missing algorithm strings
*/
mapping_t kernel_integrity_algs_m[] = {
{AUTH_HMAC_MD5_96, "md5"},
{AUTH_HMAC_SHA1_96, "sha1"},
{AUTH_DES_MAC, ""},
{AUTH_KPDK_MD5, ""},
{AUTH_AES_XCBC_96, ""},
{MAPPING_END, NULL}
};
/**
* Implementation of kernel_interface_t.get_spi.
*/
static status_t get_spi(private_kernel_interface_t *this,
host_t *src, host_t *dest,
protocol_id_t protocol, u_int32_t reqid,
u_int32_t *spi)
{
netlink_message_t request, *response;
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL2, "getting spi");
memset(&request, 0, sizeof(request));
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.spi)));
request.hdr.nlmsg_flags = NLM_F_REQUEST;
request.hdr.nlmsg_type = XFRM_MSG_ALLOCSPI;
request.spi.info.saddr = src->get_xfrm_addr(src);
request.spi.info.id.daddr = dest->get_xfrm_addr(dest);
request.spi.info.mode = TRUE; /* tunnel mode */
request.spi.info.reqid = reqid;
request.spi.info.id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
request.spi.info.family = PF_INET;
request.spi.min = 0xc0000000;
request.spi.max = 0xcFFFFFFF;
if (this->send_message(this, &request, &response) != SUCCESS)
{
this->logger->log(this->logger, ERROR, "netlink communication failed");
return FAILED;
}
else if (response->hdr.nlmsg_type == NLMSG_ERROR)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_ALLOCSPI got an error: %s",
strerror(-response->e.error));
status = FAILED;
}
else if (response->hdr.nlmsg_type != XFRM_MSG_NEWSA)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_ALLOCSPI got a unknown reply");
status = FAILED;
}
else if (response->hdr.nlmsg_len < NLMSG_LENGTH(sizeof(response->sa)))
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_ALLOCSPI got an invalid reply");
status = FAILED;
}
else
{
*spi = response->sa.id.spi;
}
free(response);
return status;
}
/**
* Implementation of kernel_interface_t.add_sa.
*/
static status_t add_sa( private_kernel_interface_t *this,
host_t *me,
host_t *other,
u_int32_t spi,
int protocol,
u_int32_t reqid,
u_int64_t expire_soft,
u_int64_t expire_hard,
encryption_algorithm_t enc_alg,
chunk_t encryption_key,
integrity_algorithm_t int_alg,
chunk_t integrity_key,
bool replace)
{
netlink_message_t request, *response;
memset(&request, 0, sizeof(request));
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL2, "adding SA");
request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
request.hdr.nlmsg_type = replace ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
request.sa.saddr = me->get_xfrm_addr(me);
request.sa.id.daddr = other->get_xfrm_addr(other);
request.sa.id.spi = spi;
request.sa.id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
request.sa.family = me->get_family(me);
request.sa.mode = TRUE; /* tunnel mode */
request.sa.replay_window = 32;
request.sa.reqid = reqid;
/* we currently do not expire SAs by volume/packet count */
request.sa.lft.soft_byte_limit = XFRM_INF;
request.sa.lft.hard_byte_limit = XFRM_INF;
request.sa.lft.soft_packet_limit = XFRM_INF;
request.sa.lft.hard_packet_limit = XFRM_INF;
/* we use lifetimes since added, not since used */
request.sa.lft.soft_add_expires_seconds = expire_soft;
request.sa.lft.hard_add_expires_seconds = expire_hard;
request.sa.lft.soft_use_expires_seconds = 0;
request.sa.lft.hard_use_expires_seconds = 0;
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.sa)));
if (enc_alg != ENCR_UNDEFINED)
{
xfrm_data_t *data = (xfrm_data_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
data->type = XFRMA_ALG_CRYPT;
data->length = 4 + sizeof(data->algo) + encryption_key.len;
data->algo.alg_key_len = encryption_key.len * 8;
request.hdr.nlmsg_len += data->length;
if (request.hdr.nlmsg_len > sizeof(request))
{
return FAILED;
}
strcpy(data->algo.alg_name, mapping_find(kernel_encryption_algs_m, enc_alg));
memcpy(data->algo.alg_key, encryption_key.ptr, encryption_key.len);
}
if (int_alg != AUTH_UNDEFINED)
{
xfrm_data_t *data = (xfrm_data_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
data->type = XFRMA_ALG_AUTH;
data->length = 4 + sizeof(data->algo) + integrity_key.len;
data->algo.alg_key_len = integrity_key.len * 8;
request.hdr.nlmsg_len += data->length;
if (request.hdr.nlmsg_len > sizeof(request))
{
return FAILED;
}
strcpy(data->algo.alg_name, mapping_find(kernel_integrity_algs_m, int_alg));
memcpy(data->algo.alg_key, integrity_key.ptr, integrity_key.len);
}
/* TODO: add IPComp here*/
if (this->send_message(this, &request, &response) != SUCCESS)
{
this->logger->log(this->logger, ERROR, "netlink communication failed");
return FAILED;
}
else if (response->hdr.nlmsg_type != NLMSG_ERROR)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_NEWSA not acknowledged");
status = FAILED;
}
else if (response->e.error)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_NEWSA got error %s",
strerror(-response->e.error));
status = FAILED;
}
free(response);
return status;
}
static status_t del_sa( private_kernel_interface_t *this,
host_t *dst,
u_int32_t spi,
protocol_id_t protocol)
{
netlink_message_t request, *response;
memset(&request, 0, sizeof(request));
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL2, "deleting SA");
request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
request.hdr.nlmsg_type = XFRM_MSG_DELSA;
request.sa_id.daddr = dst->get_xfrm_addr(dst);
request.sa_id.spi = spi;
request.sa_id.proto = (protocol == PROTO_ESP) ? KERNEL_ESP : KERNEL_AH;
request.sa_id.family = dst->get_family(dst);
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.sa_id)));
if (this->send_message(this, &request, &response) != SUCCESS)
{
return FAILED;
}
else if (response->hdr.nlmsg_type != NLMSG_ERROR)
{
status = FAILED;
}
else if (response->e.error)
{
status = FAILED;
}
free(response);
return status;
}
/**
* Implementation of kernel_interface_t.add_policy.
*/
static status_t add_policy(private_kernel_interface_t *this,
host_t *me, host_t *other,
host_t *src, host_t *dst,
u_int8_t src_hostbits, u_int8_t dst_hostbits,
int direction, int upper_proto,
bool ah, bool esp,
u_int32_t reqid)
{
netlink_message_t request, *response;
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL2, "adding policy");
memset(&request, 0, sizeof(request));
request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
request.policy.sel.sport = htons(src->get_port(src));
request.policy.sel.dport = htons(dst->get_port(dst));
request.policy.sel.sport_mask = (request.policy.sel.sport) ? ~0 : 0;
request.policy.sel.dport_mask = (request.policy.sel.dport) ? ~0 : 0;
request.policy.sel.saddr = src->get_xfrm_addr(src);
request.policy.sel.daddr = dst->get_xfrm_addr(dst);
request.policy.sel.prefixlen_s = src_hostbits;
request.policy.sel.prefixlen_d = dst_hostbits;
request.policy.sel.proto = upper_proto;
request.policy.sel.family = src->get_family(src);
request.hdr.nlmsg_type = XFRM_MSG_NEWPOLICY;
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.policy)));
request.policy.dir = direction;
request.policy.priority = SPD_PRIORITY;
request.policy.action = XFRM_POLICY_ALLOW;
request.policy.share = XFRM_SHARE_ANY;
/* policies currently don't expire */
request.policy.lft.soft_byte_limit = XFRM_INF;
request.policy.lft.soft_packet_limit = XFRM_INF;
request.policy.lft.hard_byte_limit = XFRM_INF;
request.policy.lft.hard_packet_limit = XFRM_INF;
request.sa.lft.soft_add_expires_seconds = 0;
request.sa.lft.hard_add_expires_seconds = 0;
request.sa.lft.soft_use_expires_seconds = 0;
request.sa.lft.hard_use_expires_seconds = 0;
if (esp || ah)
{
xfrm_data_t *data;
int tmpl_pos = 0;
data = (xfrm_data_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
data->type = XFRMA_TMPL;
if (esp)
{
data->tmpl[tmpl_pos].reqid = reqid;
data->tmpl[tmpl_pos].id.proto = KERNEL_ESP;
data->tmpl[tmpl_pos].aalgos = data->tmpl[tmpl_pos].ealgos = data->tmpl[tmpl_pos].calgos = ~0;
data->tmpl[tmpl_pos].mode = TRUE;
data->tmpl[tmpl_pos].saddr = me->get_xfrm_addr(me);
data->tmpl[tmpl_pos].id.daddr = me->get_xfrm_addr(other);
tmpl_pos++;
}
if (ah)
{
data->tmpl[tmpl_pos].reqid = reqid;
data->tmpl[tmpl_pos].id.proto = KERNEL_AH;
data->tmpl[tmpl_pos].aalgos = data->tmpl[tmpl_pos].ealgos = data->tmpl[tmpl_pos].calgos = ~0;
data->tmpl[tmpl_pos].mode = TRUE;
data->tmpl[tmpl_pos].saddr = me->get_xfrm_addr(me);
data->tmpl[tmpl_pos].id.daddr = other->get_xfrm_addr(other);
tmpl_pos++;
}
data->length = 4 + sizeof(struct xfrm_user_tmpl) * tmpl_pos;
request.hdr.nlmsg_len += data->length;
}
if (this->send_message(this, &request, &response) != SUCCESS)
{
this->logger->log(this->logger, ERROR, "netlink communication failed");
return FAILED;
}
else if (response->hdr.nlmsg_type != NLMSG_ERROR)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_NEWPOLICY not acknowledged");
status = FAILED;
}
else if (response->e.error)
{
this->logger->log(this->logger, ERROR, "netlink request XFRM_MSG_NEWPOLICY got error %s",
strerror(-response->e.error));
status = FAILED;
}
free(response);
return status;
}
/**
* Implementation of kernel_interface_t.del_policy.
*/
static status_t del_policy(private_kernel_interface_t *this,
host_t *me, host_t *other,
host_t *src, host_t *dst,
u_int8_t src_hostbits, u_int8_t dst_hostbits,
int direction, int upper_proto)
{
netlink_message_t request, *response;
status_t status = SUCCESS;
this->logger->log(this->logger, CONTROL|LEVEL2, "deleting policy");
memset(&request, 0, sizeof(request));
request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
request.policy_id.sel.sport = htons(src->get_port(src));
request.policy_id.sel.dport = htons(dst->get_port(dst));
request.policy_id.sel.sport_mask = (request.policy.sel.sport) ? ~0 : 0;
request.policy_id.sel.dport_mask = (request.policy.sel.dport) ? ~0 : 0;
request.policy_id.sel.saddr = src->get_xfrm_addr(src);
request.policy_id.sel.daddr = dst->get_xfrm_addr(dst);
request.policy_id.sel.prefixlen_s = src_hostbits;
request.policy_id.sel.prefixlen_d = dst_hostbits;
request.policy_id.sel.proto = upper_proto;
request.policy_id.sel.family = src->get_family(src);
request.policy_id.dir = direction;
request.hdr.nlmsg_type = XFRM_MSG_DELPOLICY;
request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.policy_id)));
if (this->send_message(this, &request, &response) != SUCCESS)
{
return FAILED;
}
else if (response->hdr.nlmsg_type != NLMSG_ERROR)
{
status = FAILED;
}
else if (response->e.error)
{
status = FAILED;
}
free(response);
return status;
}
/**
* Implementation of private_kernel_interface_t.send_message.
*/
static status_t send_message(private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t **response)
{
size_t length;
struct sockaddr_nl addr;
request->hdr.nlmsg_seq = ++this->seq;
request->hdr.nlmsg_pid = this->pid;
memset(&addr, 0, sizeof(struct sockaddr_nl));
addr.nl_family = AF_NETLINK;
addr.nl_pid = 0;
addr.nl_groups = 0;
length = sendto(this->socket,(void *)request, request->hdr.nlmsg_len, 0, (struct sockaddr *)&addr, sizeof(addr));
if (length < 0)
{
return FAILED;
}
else if (length != request->hdr.nlmsg_len)
{
return FAILED;
}
pthread_mutex_lock(&(this->mutex));
while (TRUE)
{
iterator_t *iterator;
bool found = FALSE;
/* search list, break if found */
iterator = this->responses->create_iterator(this->responses, TRUE);
while (iterator->has_next(iterator))
{
netlink_message_t *listed_response;
iterator->current(iterator, (void**)&listed_response);
if (listed_response->hdr.nlmsg_seq == request->hdr.nlmsg_seq)
{
/* matches our request, this is the reply */
*response = listed_response;
found = TRUE;
break;
}
}
iterator->destroy(iterator);
if (found)
{
break;
}
/* TODO: we should time out, if something goes wrong!??? */
pthread_cond_wait(&(this->condvar), &(this->mutex));
}
pthread_mutex_unlock(&(this->mutex));
return SUCCESS;
}
/**
* Implementation of private_kernel_interface_t.receive_messages.
*/
static void receive_messages(private_kernel_interface_t *this)
{
while(TRUE)
{
netlink_message_t response, *listed_response;
while (TRUE)
{
struct sockaddr_nl addr;
socklen_t addr_length;
size_t length;
addr_length = sizeof(addr);
response.hdr.nlmsg_type = XFRM_MSG_NEWSA;
length = recvfrom(this->socket, &response, sizeof(response), 0, (struct sockaddr*)&addr, &addr_length);
if (length < 0)
{
if (errno == EINTR)
{
/* interrupted, try again */
continue;
}
charon->kill(charon, "receiving from netlink socket failed");
}
if (!NLMSG_OK(&response.hdr, length))
{
/* bad netlink message */
continue;
}
if (addr.nl_pid != 0)
{
/* not from kernel. not interested, try another one */
continue;
}
/* good message, handle it */
break;
}
/* we handle ACQUIRE and EXPIRE messages directly
*/
if (response.hdr.nlmsg_type == XFRM_MSG_ACQUIRE)
{
this->logger->log(this->logger, CONTROL,
"Received a XFRM_MSG_ACQUIRE. Ignored");
}
else if (response.hdr.nlmsg_type == XFRM_MSG_EXPIRE)
{
job_t *job;
this->logger->log(this->logger, CONTROL|LEVEL1,
"Received a XFRM_MSG_EXPIRE");
this->logger->log(this->logger, CONTROL|LEVEL0,
"creating %s job for CHILD_SA with reqid %d",
response.expire.hard ? "delete" : "rekey",
response.expire.state.reqid);
if (response.expire.hard)
{
job = (job_t*)delete_child_sa_job_create(
response.expire.state.reqid);
}
else
{
job = (job_t*)rekey_child_sa_job_create(
response.expire.state.reqid);
}
charon->job_queue->add(charon->job_queue, job);
}
/* NLMSG_ERROR is send back for acknowledge (or on error), an
* XFRM_MSG_NEWSA is returned when we alloc spis.
* list these responses for the sender
*/
else if (response.hdr.nlmsg_type == NLMSG_ERROR ||
response.hdr.nlmsg_type == XFRM_MSG_NEWSA)
{
/* add response to queue */
listed_response = malloc(sizeof(response));
memcpy(listed_response, &response, sizeof(response));
pthread_mutex_lock(&(this->mutex));
this->responses->insert_last(this->responses, (void*)listed_response);
pthread_mutex_unlock(&(this->mutex));
/* signal ALL waiting threads */
pthread_cond_broadcast(&(this->condvar));
}
/* we are not interested in anything other.
* anyway, move on to the next message */
continue;
}
}
/**
* Implementation of kernel_interface_t.destroy.
*/
static void destroy(private_kernel_interface_t *this)
{
pthread_cancel(this->thread);
pthread_join(this->thread, NULL);
close(this->socket);
this->responses->destroy(this->responses);
free(this);
}
/*
* Described in header.
*/
kernel_interface_t *kernel_interface_create()
{
struct sockaddr_nl addr;
private_kernel_interface_t *this = malloc_thing(private_kernel_interface_t);
/* public functions */
this->public.get_spi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,protocol_id_t,u_int32_t,u_int32_t*))get_spi;
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,encryption_algorithm_t,chunk_t,integrity_algorithm_t,chunk_t,bool))add_sa;
this->public.add_policy = (status_t(*)(kernel_interface_t*,host_t*, host_t*,host_t*,host_t*,u_int8_t,u_int8_t,int,int,bool,bool,u_int32_t))add_policy;
this->public.del_sa = (status_t(*)(kernel_interface_t*,host_t*,u_int32_t,protocol_id_t))del_sa;
this->public.del_policy = (status_t(*)(kernel_interface_t*,host_t*,host_t*,host_t*,host_t*,u_int8_t,u_int8_t,int,int))del_policy;
this->public.destroy = (void(*)(kernel_interface_t*)) destroy;
/* private members */
this->receive_messages = receive_messages;
this->send_message = send_message;
this->pid = getpid();
this->responses = linked_list_create();
this->logger = logger_manager->get_logger(logger_manager, XFRM);
pthread_mutex_init(&(this->mutex),NULL);
pthread_cond_init(&(this->condvar),NULL);
this->seq = 0;
/* open netlink socket */
this->socket = socket(PF_NETLINK, SOCK_RAW, NETLINK_XFRM);
if (this->socket <= 0)
{
this->responses->destroy(this->responses);
free(this);
charon->kill(charon, "Unable to create netlink socket");
}
/* bind the socket and reqister for ACQUIRE & EXPIRE */
addr.nl_family = AF_NETLINK;
addr.nl_pid = getpid();
addr.nl_groups = XFRMGRP_ACQUIRE | XFRMGRP_EXPIRE;
if (bind(this->socket, (struct sockaddr*)&addr, sizeof(addr)) != 0)
{
this->responses->destroy(this->responses);
close(this->socket);
free(this);
charon->kill(charon, "Unable to bind netlink socket");
}
if (pthread_create(&(this->thread), NULL, (void*(*)(void*))this->receive_messages, this) != 0)
{
this->responses->destroy(this->responses);
close(this->socket);
free(this);
charon->kill(charon, "Unable to create netlink thread");
}
return (&this->public);
}
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