| 1 |
583 |
jeremybenn |
/*
|
| 2 |
|
|
* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
|
| 3 |
|
|
* All rights reserved.
|
| 4 |
|
|
*
|
| 5 |
|
|
* Redistribution and use in source and binary forms, with or without modification,
|
| 6 |
|
|
* are permitted provided that the following conditions are met:
|
| 7 |
|
|
*
|
| 8 |
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
| 9 |
|
|
* this list of conditions and the following disclaimer.
|
| 10 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
| 11 |
|
|
* this list of conditions and the following disclaimer in the documentation
|
| 12 |
|
|
* and/or other materials provided with the distribution.
|
| 13 |
|
|
* 3. The name of the author may not be used to endorse or promote products
|
| 14 |
|
|
* derived from this software without specific prior written permission.
|
| 15 |
|
|
*
|
| 16 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
| 17 |
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
| 18 |
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
|
| 19 |
|
|
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
| 20 |
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
| 21 |
|
|
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
| 22 |
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
| 23 |
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
| 24 |
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
|
| 25 |
|
|
* OF SUCH DAMAGE.
|
| 26 |
|
|
*
|
| 27 |
|
|
* This file is part of the lwIP TCP/IP stack.
|
| 28 |
|
|
*
|
| 29 |
|
|
* Author: Adam Dunkels <adam@sics.se>
|
| 30 |
|
|
*
|
| 31 |
|
|
*/
|
| 32 |
|
|
|
| 33 |
|
|
#include "lwip/ip_addr.h"
|
| 34 |
|
|
#include "lwip/inet.h"
|
| 35 |
|
|
#include "lwip/netif.h"
|
| 36 |
|
|
|
| 37 |
|
|
/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
|
| 38 |
|
|
const struct ip_addr ip_addr_any = { 0x00000000UL };
|
| 39 |
|
|
const struct ip_addr ip_addr_broadcast = { 0xffffffffUL };
|
| 40 |
|
|
|
| 41 |
|
|
/* Determine if an address is a broadcast address on a network interface
|
| 42 |
|
|
*
|
| 43 |
|
|
* @param addr address to be checked
|
| 44 |
|
|
* @param netif the network interface against which the address is checked
|
| 45 |
|
|
* @return returns non-zero if the address is a broadcast address
|
| 46 |
|
|
*
|
| 47 |
|
|
*/
|
| 48 |
|
|
|
| 49 |
|
|
u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif)
|
| 50 |
|
|
{
|
| 51 |
|
|
/* all ones (broadcast) or all zeroes (old skool broadcast) */
|
| 52 |
|
|
if ((addr->addr == ip_addr_broadcast.addr) ||
|
| 53 |
|
|
(addr->addr == ip_addr_any.addr))
|
| 54 |
|
|
return 1;
|
| 55 |
|
|
/* no broadcast support on this network interface? */
|
| 56 |
|
|
else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0)
|
| 57 |
|
|
/* the given address cannot be a broadcast address
|
| 58 |
|
|
* nor can we check against any broadcast addresses */
|
| 59 |
|
|
return 0;
|
| 60 |
|
|
/* address matches network interface address exactly? => no broadcast */
|
| 61 |
|
|
else if (addr->addr == netif->ip_addr.addr)
|
| 62 |
|
|
return 0;
|
| 63 |
|
|
/* on the same (sub) network... */
|
| 64 |
|
|
else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask))
|
| 65 |
|
|
/* ...and host identifier bits are all ones? =>... */
|
| 66 |
|
|
&& ((addr->addr & ~netif->netmask.addr) ==
|
| 67 |
|
|
(ip_addr_broadcast.addr & ~netif->netmask.addr)))
|
| 68 |
|
|
/* => network broadcast address */
|
| 69 |
|
|
return 1;
|
| 70 |
|
|
else
|
| 71 |
|
|
return 0;
|
| 72 |
|
|
}
|
