451 lines
11 KiB
C
451 lines
11 KiB
C
/**
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* @file kernel_interface.c
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*
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* @brief Implementation of kernel_interface_t.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <linux/xfrm.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include "kernel_interface.h"
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#include <daemon.h>
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#include <utils/allocator.h>
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#include <utils/linked_list.h>
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typedef struct netlink_message_t netlink_message_t;
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struct netlink_message_t {
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/**
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* header of the netlink message
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*/
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struct nlmsghdr hdr;
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union {
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struct nlmsgerr e;
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struct xfrm_userspi_info spi;
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struct {
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struct xfrm_usersa_info sa;
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u_int8_t data[512];
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};
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};
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};
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typedef struct netlink_algo_t netlink_algo_t;
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struct netlink_algo_t {
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u_int16_t length;
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u_int16_t type;
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struct xfrm_algo algo;
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};
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typedef struct private_kernel_interface_t private_kernel_interface_t;
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/**
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* @brief Private Variables and Functions of kernel_interface class.
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*
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*/
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struct private_kernel_interface_t {
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/**
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* Public part of the kernel_interface_t object.
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*/
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kernel_interface_t public;
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/**
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* Netlink communication socket.
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*/
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int socket;
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int bc_socket;
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pid_t pid;
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/**
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* Sequence number for messages.
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*/
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u_int32_t seq;
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/**
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* List of responded messages.
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*/
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linked_list_t *responses;
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/**
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* Thread which receives messages.
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*/
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pthread_t thread;
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/**
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* Mutex locks access to replies list.
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*/
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pthread_mutex_t mutex;
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/**
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* Condvar allows signaling of threads waiting for a reply.
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*/
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pthread_cond_t condvar;
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logger_t *logger;
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/**
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* Function for the thread, receives messages.
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*/
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void (*receive_messages) (private_kernel_interface_t *this);
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/**
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* Sends a netlink_message_t down to the kernel.
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*/
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status_t (*send_message) (private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t **response);
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};
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mapping_t kernel_encryption_algs_m[] = {
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{ENCR_DES_IV64, ""},
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{ENCR_DES, "des"},
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{ENCR_3DES, "3des"},
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{ENCR_RC5, ""},
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{ENCR_IDEA, ""},
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{ENCR_CAST, ""},
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{ENCR_BLOWFISH, ""},
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{ENCR_3IDEA, ""},
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{ENCR_DES_IV32, ""},
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{ENCR_NULL, ""},
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{ENCR_AES_CBC, "aes"},
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{ENCR_AES_CTR, ""},
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{MAPPING_END, NULL}
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};
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mapping_t kernel_integrity_algs_m[] = {
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{AUTH_HMAC_MD5_96, "md5"},
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{AUTH_HMAC_SHA1_96, "sha1"},
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{AUTH_DES_MAC, ""},
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{AUTH_KPDK_MD5, ""},
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{AUTH_AES_XCBC_96, ""},
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{MAPPING_END, NULL}
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};
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static status_t get_spi(private_kernel_interface_t *this, host_t *src, host_t *dest, protocol_id_t protocol, bool tunnel_mode, u_int32_t *spi)
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{
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netlink_message_t request, *response;
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memset(&request, 0, sizeof(request));
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request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.spi)));
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request.hdr.nlmsg_flags = NLM_F_REQUEST;
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request.hdr.nlmsg_type = XFRM_MSG_ALLOCSPI;
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request.spi.info.saddr = src->get_xfrm_addr(src);
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request.spi.info.id.daddr = dest->get_xfrm_addr(dest);
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request.spi.info.mode = tunnel_mode;
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request.spi.info.id.proto = protocol;
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request.spi.info.family = PF_INET;
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request.spi.min = 100;
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request.spi.max = 200;
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if (this->send_message(this, &request, &response) != SUCCESS)
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{
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return FAILED;
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}
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if (response->hdr.nlmsg_type == NLMSG_ERROR)
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{
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return FAILED;
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}
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if (response->hdr.nlmsg_type != XFRM_MSG_NEWSA)
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{
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return FAILED;
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}
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else if (response->hdr.nlmsg_len < NLMSG_LENGTH(sizeof(response->sa)))
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{
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return FAILED;
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}
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*spi = response->sa.id.spi;
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allocator_free(response);
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return SUCCESS;
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}
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static status_t add_sa( private_kernel_interface_t *this,
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host_t *me,
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host_t *other,
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u_int32_t spi,
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int protocol,
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bool tunnel_mode,
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encryption_algorithm_t enc_alg,
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size_t enc_size,
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chunk_t enc_key,
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integrity_algorithm_t int_alg,
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size_t int_size,
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chunk_t int_key,
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bool replace)
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{
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netlink_message_t request, *response;
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memset(&request, 0, sizeof(request));
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request.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
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request.hdr.nlmsg_type = replace ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
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request.sa.saddr = me->get_xfrm_addr(me);
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request.sa.id.daddr = other->get_xfrm_addr(other);
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request.sa.id.spi = spi;
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request.sa.id.proto = protocol;
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request.sa.family = me->get_family(me);
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request.sa.mode = tunnel_mode;
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request.sa.replay_window = 0; //sa->replay_window; ???
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request.sa.reqid = 0; //sa->reqid; ???
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request.sa.lft.soft_byte_limit = XFRM_INF;
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request.sa.lft.soft_packet_limit = XFRM_INF;
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request.sa.lft.hard_byte_limit = XFRM_INF;
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request.sa.lft.hard_packet_limit = XFRM_INF;
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request.hdr.nlmsg_len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(request.sa)));
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if (enc_alg != ENCR_UNDEFINED)
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{
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netlink_algo_t *nla = (netlink_algo_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
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nla->type = XFRMA_ALG_CRYPT;
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nla->length = sizeof(netlink_algo_t) + enc_size;
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nla->algo.alg_key_len = enc_size * 8;
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strcpy(nla->algo.alg_name, mapping_find(kernel_encryption_algs_m, enc_alg));
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memcpy(nla->algo.alg_key, enc_key.ptr, enc_key.len);
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request.hdr.nlmsg_len += nla->length;
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}
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if (int_alg != AUTH_UNDEFINED)
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{
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netlink_algo_t *nla = (netlink_algo_t*)(((u_int8_t*)&request) + request.hdr.nlmsg_len);
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nla->type = XFRMA_ALG_AUTH;
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nla->length = sizeof(netlink_algo_t) + int_size;
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nla->algo.alg_key_len = int_size * 8;
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strcpy(nla->algo.alg_name, mapping_find(kernel_integrity_algs_m, int_alg));
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memcpy(nla->algo.alg_key, int_key.ptr, int_key.len);
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request.hdr.nlmsg_len += nla->length;
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}
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/* add IPComp */
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if (this->send_message(this, &request, &response) != SUCCESS)
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{
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allocator_free(response);
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return FAILED;
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}
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printf("received message type: %d\n", response->hdr.nlmsg_type);
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if (response->hdr.nlmsg_type == NLMSG_ERROR)
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{
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printf("received error: %s\n", strerror(-response->e.error));
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}
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allocator_free(response);
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return SUCCESS;
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}
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static status_t send_message(private_kernel_interface_t *this, netlink_message_t *request, netlink_message_t **response)
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{
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size_t length;
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struct sockaddr_nl addr;
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request->hdr.nlmsg_seq = ++this->seq;
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request->hdr.nlmsg_pid = this->pid;
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memset(&addr, 0, sizeof(struct sockaddr_nl));
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addr.nl_family = AF_NETLINK;
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addr.nl_pid = 0;
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addr.nl_groups = 0;
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length = sendto(this->socket,(void *)request, request->hdr.nlmsg_len, 0, (struct sockaddr *)&addr, sizeof(addr));
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if (length < 0)
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{
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return FAILED;
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}
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else if (length != request->hdr.nlmsg_len)
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{
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return FAILED;
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}
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pthread_mutex_lock(&(this->mutex));
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while (TRUE)
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{
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iterator_t *iterator;
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bool found = FALSE;
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/* search list, break if found */
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iterator = this->responses->create_iterator(this->responses, TRUE);
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while (iterator->has_next(iterator))
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{
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netlink_message_t *listed_response;
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iterator->current(iterator, (void**)&listed_response);
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if (listed_response->hdr.nlmsg_seq == request->hdr.nlmsg_seq)
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{
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/* matches our request, this is the reply */
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*response = listed_response;
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found = TRUE;
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break;
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}
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}
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iterator->destroy(iterator);
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if (found)
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{
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break;
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}
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/* we should time out, if something goes wrong */
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pthread_cond_wait(&(this->condvar), &(this->mutex));
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}
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pthread_mutex_unlock(&(this->mutex));
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return SUCCESS;
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}
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static void receive_messages(private_kernel_interface_t *this)
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{
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while(TRUE)
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{
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netlink_message_t response, *listed_response;
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while (TRUE)
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{
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struct sockaddr_nl addr;
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socklen_t addr_length;
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size_t length;
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addr_length = sizeof(addr);
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response.hdr.nlmsg_type = XFRM_MSG_NEWSA;
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length = recvfrom(this->socket, &response, sizeof(response), 0, (struct sockaddr*)&addr, &addr_length);
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if (length < 0)
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{
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if (errno == EINTR)
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{
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/* interrupted, try again */
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continue;
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}
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charon->kill(charon, "receiving from netlink socket failed");
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}
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if (!NLMSG_OK(&response.hdr, length))
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{
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/* bad netlink message */
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continue;
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}
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if (addr.nl_pid != 0)
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{
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/* not interested, try another one */
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continue;
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}
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break;
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}
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/* got a valid message.
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* requests are handled on or own,
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* responses are listed for the requesters
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*/
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if (response.hdr.nlmsg_flags & NLM_F_REQUEST)
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{
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/* handle request */
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}
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else
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{
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/* add response to queue */
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listed_response = allocator_alloc(sizeof(response));
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memcpy(listed_response, &response, sizeof(response));
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pthread_mutex_lock(&(this->mutex));
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this->responses->insert_last(this->responses, (void*)listed_response);
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pthread_mutex_unlock(&(this->mutex));
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/* signal ALL waiting threads */
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pthread_cond_broadcast(&(this->condvar));
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}
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/* get the next one */
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}
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}
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/**
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* Implementation of kernel_interface_t.destroy.
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*/
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static void destroy(private_kernel_interface_t *this)
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{
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pthread_cancel(this->thread);
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pthread_join(this->thread, NULL);
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close(this->socket);
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this->responses->destroy(this->responses);
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allocator_free(this);
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}
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/*
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* Described in header.
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*/
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kernel_interface_t *kernel_interface_create()
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{
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private_kernel_interface_t *this = allocator_alloc_thing(private_kernel_interface_t);
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/* public functions */
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this->public.get_spi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,protocol_id_t,bool,u_int32_t*))get_spi;
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this->public.add_sa = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,int,bool,encryption_algorithm_t,size_t,chunk_t,integrity_algorithm_t,size_t,chunk_t,bool))add_sa;
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this->public.destroy = (void(*)(kernel_interface_t*)) destroy;
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/* private members */
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this->receive_messages = receive_messages;
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this->send_message = send_message;
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this->pid = getpid();
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this->responses = linked_list_create();
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pthread_mutex_init(&(this->mutex),NULL);
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pthread_cond_init(&(this->condvar),NULL);
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this->seq = 0;
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this->socket = socket(PF_NETLINK, SOCK_RAW, NETLINK_XFRM);
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if (this->socket <= 0)
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{
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allocator_free(this);
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charon->kill(charon, "Unable to create netlink socket");
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}
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if (pthread_create(&(this->thread), NULL, (void*(*)(void*))this->receive_messages, this) != 0)
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{
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close(this->socket);
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allocator_free(this);
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charon->kill(charon, "Unable to create netlink thread");
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}
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this->logger = charon->logger_manager->create_logger(charon->logger_manager, TESTER, NULL);
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charon->logger_manager->enable_logger_level(charon->logger_manager, TESTER, FULL);
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return (&this->public);
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}
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