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jeremybenn |
/**
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* @file
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* This is the IPv4 address tools implementation.
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*
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include "lwip/opt.h"
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#include "lwip/ip_addr.h"
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#include "lwip/inet.h"
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#include "lwip/netif.h"
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#define IP_ADDR_ANY_VALUE 0x00000000UL
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#define IP_ADDR_BROADCAST_VALUE 0xffffffffUL
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/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
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const struct ip_addr ip_addr_any = { IP_ADDR_ANY_VALUE };
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const struct ip_addr ip_addr_broadcast = { IP_ADDR_BROADCAST_VALUE };
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/**
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* Determine if an address is a broadcast address on a network interface
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*
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* @param addr address to be checked
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* @param netif the network interface against which the address is checked
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* @return returns non-zero if the address is a broadcast address
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*/
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u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif)
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{
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u32_t addr2test;
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addr2test = addr->addr;
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/* all ones (broadcast) or all zeroes (old skool broadcast) */
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if ((~addr2test == IP_ADDR_ANY_VALUE) ||
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(addr2test == IP_ADDR_ANY_VALUE))
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return 1;
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/* no broadcast support on this network interface? */
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else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0)
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/* the given address cannot be a broadcast address
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* nor can we check against any broadcast addresses */
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return 0;
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/* address matches network interface address exactly? => no broadcast */
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else if (addr2test == netif->ip_addr.addr)
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return 0;
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/* on the same (sub) network... */
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else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask))
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/* ...and host identifier bits are all ones? =>... */
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&& ((addr2test & ~netif->netmask.addr) ==
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(IP_ADDR_BROADCAST_VALUE & ~netif->netmask.addr)))
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/* => network broadcast address */
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return 1;
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else
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return 0;
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}
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