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kv_lib.h
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kv_lib.h
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/**
* @file
* KidVPN library.
* Verification using sylixos(tm) real-time operating system
*/
/*
* Copyright (c) 2006-2018 SylixOS Group.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* 4. This code has been or is applying for intellectual property protection
* and can only be used with acoinfo software products.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Han.hui <[email protected]>
*
*/
#ifndef __KV_LIB_H
#define __KV_LIB_H
#define _GNU_SOURCE /* need some *np api */
#ifndef SYLIXOS
typedef unsigned char UINT8;
typedef unsigned short UINT16;
typedef unsigned int UINT32;
#endif /* !SYLIXOS */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <netdb.h>
#include <signal.h>
#include <pthread.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <arpa/inet.h>
#ifdef SYLIXOS
#include <net/if_vnd.h>
#include <net/if_ether.h>
#else /* SYLIXOS */
#include <linux/if_tun.h>
#include <netinet/if_ether.h>
#endif /* LINUX */
#ifdef USE_OPENSSL
#include <openssl/aes.h>
#include <openssl/md5.h>
#else /* USE_OPENSSL */
#include <mbedtls/aes.h>
#include <mbedtls/md5.h>
#endif /* !USE_OPENSSL */
#ifdef __cplusplus
extern "C" {
#endif
/* Voluntarily quit */
#ifndef KV_VOLUNTARILY_QUIT
#ifdef SYLIXOS
#define KV_VOLUNTARILY_QUIT 1
#else
#define KV_VOLUNTARILY_QUIT 0
#endif
#endif
#if KV_VOLUNTARILY_QUIT
#include <sys/signalfd.h>
#endif
/* ROUND UP */
#ifndef ROUND_UP
#define ROUND_UP(x, align) (size_t)(((size_t)(x) + (align - 1)) & ~(align - 1))
#endif
/* AES block length */
#define KV_AES_BLK_LEN 16
#define KV_AES_BLK_SHIFT 4
/* Init vector length */
#define KV_CIPHER_IV_LEN 16
/* KidVPN MTU (Try not to appear IP fragment) */
#define KV_VND_MIN_MTU 1280
#define KV_VND_MAX_MTU (ETH_DATA_LEN - 28) /* ETH_DATA_LEN - IP_HLEN - UDP_HLEN */
#define KV_VND_DEF_MTU (KV_VND_MAX_MTU - 8) /* KV_VND_MAX_MTU - PPPoE Header length */
#define KV_VND_FRAME_LEN(mtu) (mtu + 18) /* mtu + ETH_HLEN + VLAN_HLEN */
#define KV_VND_FRAME_MAX KV_VND_FRAME_LEN(KV_VND_MAX_MTU)
#define KV_VND_FRAME_BSIZE (KV_VND_FRAME_MAX + KV_AES_BLK_LEN) /* KV_VND_FRAME_MAX + AES pad */
/* hello period (s) */
#define KV_CLI_HELLO_TIMEOUT 20
#define KV_CLI_HELLO_PERIOD 5
/* hole punching alive (s) */
#define KV_CLI_HOLE_PUNCHING_ALIVE 60
/* packet mac address */
#define KV_PKT_MAC_DEST(packet) &packet[0]
#define KV_PKT_MAC_SRC(packet) &packet[6]
#define KV_PKY_MAC_BMC(packet) (packet[0] & 1) /* broadcast or multicast */
/* KidVPN core lib functions */
int kv_lib_init(int vnd_id, const char *tap_name, int *s_fd, int *v_fd, UINT8 hwaddr[], int mtu);
void kv_lib_deinit(int s_fd, int v_fd);
int kv_lib_setmtu(int s_fd, int mtu);
int kv_lib_update_iv(const char *iv_file);
#ifdef USE_OPENSSL
void kv_lib_encode(UINT8 *out, UINT8 *in, int len, int *rlen, AES_KEY *aes_en);
void kv_lib_decode(UINT8 *out, UINT8 *in, int len, int *rlen, AES_KEY *aes_de);
#else /* USE_OPENSSL */
void kv_lib_encode(UINT8 *out, UINT8 *in, int len, int *rlen, mbedtls_aes_context *aes_en);
void kv_lib_decode(UINT8 *out, UINT8 *in, int len, int *rlen, mbedtls_aes_context *aes_de);
#endif /* !USE_OPENSSL */
int kv_lib_addr_is_same(struct sockaddr_in *addr1, struct sockaddr_in *addr2);
/* KidVPN client node */
struct kv_cli_node {
struct kv_cli_node *next;
struct kv_cli_node *prev;
struct sockaddr_in addr;
UINT8 hwaddr[ETH_ALEN];
int alive;
};
/* KidVPN client node hash table */
#define KV_CLI_HASH_SIZE 256
#define KV_CLI_HASH_MASK (KV_CLI_HASH_SIZE - 1)
/* KidVPN client node management */
int kv_lib_cli_hash(UINT8 hwaddr[]);
void kv_lib_cli_add(struct kv_cli_node *cli, struct kv_cli_node *header[]);
void kv_lib_cli_delete(struct kv_cli_node *cli, struct kv_cli_node *header[]);
struct kv_cli_node *kv_lib_cli_find(UINT8 hwaddr[], struct kv_cli_node *header[]);
/* Voluntarily quit */
#if KV_VOLUNTARILY_QUIT
int kv_lib_signalfd(void);
#endif
#ifdef __cplusplus
}
#endif
#endif /* __KV_LIB_H */
/*
* end
*/