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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP/] [core/] [ipv4/] [ip_addr.c] - Blame information for rev 606

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Line No. Rev Author Line
1 606 jeremybenn
/*
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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/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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/* 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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 */
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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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