ip.h

嵌入式TCpip协议栈 开源代码

/*
 * Copyright (c) 2001, Swedish Institute of Computer Science.
 * 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. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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. 
 *
 * This file is part of the lwIP TCP/IP stack.
 * 
 * Author: Adam Dunkels <[e-mail]>
 *
 * $Id: ip.h,v 1.1 2001/12/12 10:00:59 adam Exp $
 */
#ifndef __LWIP_IP_H__
#define __LWIP_IP_H__

#include "lwip/debug.h"
#include "lwip/def.h"
#include "lwip/pbuf.h"
#include "lwip/ip_addr.h"

#include "lwip/err.h"

#define IP_HLEN 40

#define IP_PROTO_ICMP 58
#define IP_PROTO_UDP 17
#define IP_PROTO_UDPLITE 170
#define IP_PROTO_TCP 6

/* This is passed as the destination address to ip_output_if (not
   to ip_output), meaning that an IP header already is constructed
   in the pbuf. This is used when TCP retransmits. */
#ifdef IP_HDRINCL
#undef IP_HDRINCL
#endif /* IP_HDRINCL */
#define IP_HDRINCL  NULL


/* The IPv6 header. */
struct ip_hdr {
#if BYTE_ORDER == LITTLE_ENDIAN
  u8_t tclass1:4, v:4;
  u8_t flow1:4, tclass2:4;  
#else
  u8_t v:4, tclass1:4;
  u8_t tclass2:8, flow1:4;
#endif
  u16_t flow2;
  u16_t len;                /* payload length */
  u8_t nexthdr;             /* next header */
  u8_t hoplim;              /* hop limit (TTL) */
  struct ip_addr src, dest;          /* source and destination IP addresses */
};

void ip_init(void);

#include "lwip/netif.h"

struct netif *ip_route(struct ip_addr *dest);

void ip_input(struct pbuf *p, struct netif *inp);

/* source and destination addresses in network byte order, please */
err_t ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
	       unsigned char ttl, unsigned char proto);

err_t ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
		  unsigned char ttl, unsigned char proto,
		  struct netif *netif);

#if IP_DEBUG
void ip_debug_print(struct pbuf *p);
#endif /* IP_DEBUG */

#endif /* __LWIP_IP_H__ */