www.pudn.com > mutiADdisplay.rar > ip.h, change:2006-03-27,size:4668b


/* 
 * 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 <adam@sics.se> 
 * 
 * $Id: ip.h,v 1.3 2002/03/04 10:47:56 adam Exp $ 
 */ 
#ifndef __LWIP_IP_H__ 
#define __LWIP_IP_H__ 
 
#include "lwip/arch.h" 
 
#include "lwip/def.h" 
#include "lwip/pbuf.h" 
#include "ipv4/lwip/ip_addr.h" 
#include "lwip/netif.h" 
 
#include "lwip/err.h" 
 
void ip_init(void); 
u8_t ip_lookup(void *header, struct netif *inp); 
struct netif *ip_route(union ip_addr *dest); 
err_t ip_input(struct pbuf *p, struct netif *inp); 
err_t ip_output(struct pbuf *p, union ip_addr *src, union ip_addr *dest, 
		u8_t ttl, u8_t proto); 
err_t ip_output_if(struct pbuf *p, union ip_addr *src, union ip_addr *dest, 
		   u8_t ttl, u8_t proto, 
		   struct netif *netif); 
 
#define IP_HLEN 20 
 
#define IP_PROTO_ICMP 1 
#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 
 
packed struct ip_hdr { 
  /* version / header length / type of service */ 
  PACK_STRUCT_FIELD(u16_t _v_hl_tos); 
  /* total length */ 
  PACK_STRUCT_FIELD(u16_t _len); 
  /* identification */ 
  PACK_STRUCT_FIELD(u16_t _id); 
  /* fragment offset field */ 
  PACK_STRUCT_FIELD(u16_t _offset); 
#define IP_RF 0x8000        /* reserved fragment flag */ 
#define IP_DF 0x4000        /* dont fragment flag */ 
#define IP_MF 0x2000        /* more fragments flag */ 
#define IP_OFFMASK 0x1fff   /* mask for fragmenting bits */ 
  /* time to live / protocol*/ 
  PACK_STRUCT_FIELD(u16_t _ttl_proto); 
  /* checksum */ 
  PACK_STRUCT_FIELD(u16_t _chksum); 
  /* source and destination IP addresses */ 
  PACK_STRUCT_FIELD(union ip_addr src); 
  PACK_STRUCT_FIELD(union ip_addr dest);  
} PACK_STRUCT_STRUCT; 
 
#define IPH_V(hdr)  (NTOHS((hdr)->_v_hl_tos) >> 12) 
#define IPH_HL(hdr) ((NTOHS((hdr)->_v_hl_tos) >> 8) & 0x0f) 
#define IPH_TOS(hdr) HTONS((NTOHS((hdr)->_v_hl_tos) & 0xff)) 
#define IPH_LEN(hdr) ((hdr)->_len) 
#define IPH_ID(hdr) ((hdr)->_id) 
#define IPH_OFFSET(hdr) ((hdr)->_offset) 
#define IPH_TTL(hdr) (NTOHS((hdr)->_ttl_proto) >> 8) 
#define IPH_PROTO(hdr) (NTOHS((hdr)->_ttl_proto) & 0xff) 
#define IPH_CHKSUM(hdr) ((hdr)->_chksum) 
 
#define IPH_VHLTOS_SET(hdr, v, hl, tos) (hdr)->_v_hl_tos = HTONS(((v) << 12) | ((hl) << 8) | (tos)) 
#define IPH_LEN_SET(hdr, len) (hdr)->_len = (len) 
#define IPH_ID_SET(hdr, id) (hdr)->_id = (id) 
#define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off) 
#define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl_proto = HTONS(IPH_PROTO(hdr) | ((ttl) << 8)) 
#define IPH_PROTO_SET(hdr, proto) (hdr)->_ttl_proto = HTONS((proto) | (IPH_TTL(hdr) << 8)) 
#define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum) 
 
 
 
#if IP_DEBUG 
void ip_debug_print(struct pbuf *p); 
#endif /* IP_DEBUG */ 
 
#endif /* __LWIP_IP_H__ */