ip.h

最新lwip1。2。0版本。。。。大家快来下。。。。Lwip协议栈的设计与实现 LWIP是TCP/IP协议栈的一种实现。LWIP的主要目的是减少存储器利用量和代码尺寸

/*
 * Copyright (c) 2001-2004 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission. 
 *
 * 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.
 *
 * This file is part of the lwIP TCP/IP stack.
 * 
 * Author: Adam Dunkels <[e-mail]>
 *
 */
#ifndef __LWIP_IP_H__
#define __LWIP_IP_H__

#include "lwip/opt.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 136
#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,
         u8_t ttl, u8_t proto);

err_t ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
      u8_t ttl, u8_t proto,
      struct netif *netif);

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

#endif /* __LWIP_IP_H__ */