ip_addr.h

《嵌入式网络系统设计-基于Atmel ARM7 系列》这个本书的光盘资料

/*
 * 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_ADDR_H__
#define __LWIP_IP_ADDR_H__

#include "lwip/arch.h"

#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/bpstruct.h"
#endif
PACK_STRUCT_BEGIN
struct ip_addr {
  PACK_STRUCT_FIELD(u32_t addr);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/epstruct.h"
#endif

/*
 * struct ipaddr2 is used in the definition of the ARP packet format in
 * order to support compilers that don't have structure packing.
 */
#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/bpstruct.h"
#endif
PACK_STRUCT_BEGIN
struct ip_addr2 {
  PACK_STRUCT_FIELD(u16_t addrw[2]);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/epstruct.h"
#endif

/* For compatibility with BSD code */
struct in_addr {
  u32_t s_addr;
};

struct netif;

extern const struct ip_addr ip_addr_any;
extern const struct ip_addr ip_addr_broadcast;

/** IP_ADDR_ can be used as a fixed IP address
 *  for the wildcard and the broadcast address
 */
#define IP_ADDR_ANY         ((struct ip_addr *)&ip_addr_any)
#define IP_ADDR_BROADCAST   ((struct ip_addr *)&ip_addr_broadcast)

#define INADDR_NONE         ((u32_t)0xffffffff)  /* 255.255.255.255 */
#define INADDR_LOOPBACK     ((u32_t)0x7f000001)  /* 127.0.0.1 */

/* Definitions of the bits in an Internet address integer.

   On subnets, host and network parts are found according to
   the subnet mask, not these masks.  */

#define IN_CLASSA(a)        ((((u32_t)(a)) & 0x80000000) == 0)
#define IN_CLASSA_NET       0xff000000
#define IN_CLASSA_NSHIFT    24
#define IN_CLASSA_HOST      (0xffffffff & ~IN_CLASSA_NET)
#define IN_CLASSA_MAX       128

#define IN_CLASSB(a)        ((((u32_t)(a)) & 0xc0000000) == 0x80000000)
#define IN_CLASSB_NET       0xffff0000
#define IN_CLASSB_NSHIFT    16
#define IN_CLASSB_HOST      (0xffffffff & ~IN_CLASSB_NET)
#define IN_CLASSB_MAX       65536

#define IN_CLASSC(a)        ((((u32_t)(a)) & 0xe0000000) == 0xc0000000)
#define IN_CLASSC_NET       0xffffff00
#define IN_CLASSC_NSHIFT    8
#define IN_CLASSC_HOST      (0xffffffff & ~IN_CLASSC_NET)

#define IN_CLASSD(a)        (((u32_t)(a) & 0xf0000000) == 0xe0000000)
#define IN_CLASSD_NET       0xf0000000          /* These ones aren't really */
#define IN_CLASSD_NSHIFT    28                  /*   net and host fields, but */
#define IN_CLASSD_HOST      0x0fffffff          /*   routing needn't know. */
#define IN_MULTICAST(a)     IN_CLASSD(a)

#define IN_EXPERIMENTAL(a)  (((u32_t)(a) & 0xf0000000) == 0xf0000000)
#define IN_BADCLASS(a)      (((u32_t)(a) & 0xf0000000) == 0xf0000000)

#define IN_LOOPBACKNET      127                 /* official! */

#define IP4_ADDR(ipaddr, a,b,c,d) \
        (ipaddr)->addr = htonl(((u32_t)((a) & 0xff) << 24) | \
                               ((u32_t)((b) & 0xff) << 16) | \
                               ((u32_t)((c) & 0xff) << 8) | \
                                (u32_t)((d) & 0xff))

#define ip_addr_set(dest, src) (dest)->addr = \
                               ((src) == NULL? 0:\
                               (src)->addr)
/**
 * Determine if two address are on the same network.
 *
 * @arg addr1 IP address 1
 * @arg addr2 IP address 2
 * @arg mask network identifier mask
 * @return !0 if the network identifiers of both address match
 */
#define ip_addr_netcmp(addr1, addr2, mask) (((addr1)->addr & \
                                              (mask)->addr) == \
                                             ((addr2)->addr & \
                                              (mask)->addr))
#define ip_addr_cmp(addr1, addr2) ((addr1)->addr == (addr2)->addr)

#define ip_addr_isany(addr1) ((addr1) == NULL || (addr1)->addr == 0)

u8_t ip_addr_isbroadcast(struct ip_addr *, struct netif *);

#define ip_addr_ismulticast(addr1) (((addr1)->addr & ntohl(0xf0000000)) == ntohl(0xe0000000))

#define ip_addr_debug_print(debug, ipaddr) \
        LWIP_DEBUGF(debug, ("%"U16_F".%"U16_F".%"U16_F".%"U16_F, \
                ipaddr ? (u16_t)(ntohl((ipaddr)->addr) >> 24) & 0xff : 0, \
                ipaddr ? (u16_t)(ntohl((ipaddr)->addr) >> 16) & 0xff : 0, \
                ipaddr ? (u16_t)(ntohl((ipaddr)->addr) >> 8) & 0xff : 0, \
                ipaddr ? (u16_t)ntohl((ipaddr)->addr) & 0xff : 0))

/* These are cast to u16_t, with the intent that they are often arguments
 * to printf using the U16_F format from cc.h. */
#define ip4_addr1(ipaddr) ((u16_t)(ntohl((ipaddr)->addr) >> 24) & 0xff)
#define ip4_addr2(ipaddr) ((u16_t)(ntohl((ipaddr)->addr) >> 16) & 0xff)
#define ip4_addr3(ipaddr) ((u16_t)(ntohl((ipaddr)->addr) >> 8) & 0xff)
#define ip4_addr4(ipaddr) ((u16_t)(ntohl((ipaddr)->addr)) & 0xff)

#endif /* __LWIP_IP_ADDR_H__ */