/** | |
* @file | |
* This is the IPv4 address tools implementation. | |
* | |
*/ | |
/* | |
* 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 <adam@sics.se> | |
* | |
*/ | |
#include "lwip/opt.h" | |
#include "lwip/ip_addr.h" | |
#include "lwip/inet.h" | |
#include "lwip/netif.h" | |
#define IP_ADDR_ANY_VALUE 0x00000000UL | |
#define IP_ADDR_BROADCAST_VALUE 0xffffffffUL | |
/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */ | |
const struct ip_addr ip_addr_any = { IP_ADDR_ANY_VALUE }; | |
const struct ip_addr ip_addr_broadcast = { IP_ADDR_BROADCAST_VALUE }; | |
/** | |
* Determine if an address is a broadcast address on a network interface | |
* | |
* @param addr address to be checked | |
* @param netif the network interface against which the address is checked | |
* @return returns non-zero if the address is a broadcast address | |
*/ | |
u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif) | |
{ | |
u32_t addr2test; | |
addr2test = addr->addr; | |
/* all ones (broadcast) or all zeroes (old skool broadcast) */ | |
if ((~addr2test == IP_ADDR_ANY_VALUE) || | |
(addr2test == IP_ADDR_ANY_VALUE)) | |
return 1; | |
/* no broadcast support on this network interface? */ | |
else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) | |
/* the given address cannot be a broadcast address | |
* nor can we check against any broadcast addresses */ | |
return 0; | |
/* address matches network interface address exactly? => no broadcast */ | |
else if (addr2test == netif->ip_addr.addr) | |
return 0; | |
/* on the same (sub) network... */ | |
else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask)) | |
/* ...and host identifier bits are all ones? =>... */ | |
&& ((addr2test & ~netif->netmask.addr) == | |
(IP_ADDR_BROADCAST_VALUE & ~netif->netmask.addr))) | |
/* => network broadcast address */ | |
return 1; | |
else | |
return 0; | |
} |