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