util.h

mobile ip 在linux下的一种实现

/* $Id: util.h,v 1.24 2001/09/08 14:28:27 jm Exp $
 * Help routines for the agents
 *
 * Dynamic hierarchial IP tunnel
 * Copyright (C) 1998-2001, Dynamics group
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. See README and COPYING for
 * more details.
 */

#ifndef UTIL_H
#define UTIL_H

#include <sys/time.h>
#include "message.h"

#define MOVE_UNALIGNED(a,b,n) do { int _i; \
	char *_p1 = (char *) (a), *_p2 = (char *) (b); \
	for (_i = 0; _i < (n); _i ++) *_p1++ = *_p2++; \
	} while(0)
#define UNALIGNED_(a,b) MOVE_UNALIGNED(a,b,sizeof(*b))

char *
parse_long_options(int argc, char *argv[],
		   const char *command_name,
		   const char *package,
		   const char *version, void (*usage) (int, char *));
void dynamics_usage(int status, char *name);
int dynamics_write_pid_file(char *pid_file);
int dynamics_fork_daemon(void);
unsigned int get_rand32(void);
int allow_ipv4_forwarding(void);
void check_kernel_support(int options);

#define CHECK_KERNEL_ADV_ROUTING 0x01
#define CHECK_KERNEL_IPIP 0x02
#define CHECK_KERNEL_NETLINK 0x04
#define CHECK_KERNEL_GRE 0x08

void init_key_extension(struct msg_key *ext, __u16 sub_type, __u32 spi,
			__u8 keylen);
char* ether_hwtoa(unsigned char *addr);
int ether_atohw(const char *hwtxt, unsigned char *addr);
char* reply_code_str(__u8 code);
unsigned int usec_passed(struct timeval *tv, struct timeval *now);
unsigned int sec_passed(struct timeval *tv);
int cmp_timeval(struct timeval *tv1, struct timeval *tv2);
void add_usecs(struct timeval *tv, unsigned int usecs);
void set_usecs(struct timeval *tv, unsigned int const usecs);

void report_discarded_msg(const char *msg, int len, struct sockaddr_in *from,
			  const char *reason);
int get_hex_digit(const char c);
size_t dynamics_strlcpy(char *dst, const char *src, size_t size);

int ip_checksum(unsigned char *data, int len);
struct iphdr;
struct udphdr;
__u16 udp_checksum(struct iphdr *ip, struct udphdr *udp);


#endif