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 #define IP_ADDR_ANY_VALUE 0x00000000UL
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38 #define IP_ADDR_BROADCAST_VALUE 0xffffffffUL
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40 /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
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41 const struct ip_addr ip_addr_any = { IP_ADDR_ANY_VALUE };
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42 const struct ip_addr ip_addr_broadcast = { IP_ADDR_BROADCAST_VALUE };
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44 /* Determine if an address is a broadcast address on a network interface
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46 * @param addr address to be checked
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47 * @param netif the network interface against which the address is checked
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48 * @return returns non-zero if the address is a broadcast address
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52 u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif)
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56 addr2test = addr->addr;
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57 /* all ones (broadcast) or all zeroes (old skool broadcast) */
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58 if ((~addr2test == IP_ADDR_ANY_VALUE) ||
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59 (addr2test == IP_ADDR_ANY_VALUE))
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61 /* no broadcast support on this network interface? */
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62 else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0)
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63 /* the given address cannot be a broadcast address
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64 * nor can we check against any broadcast addresses */
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66 /* address matches network interface address exactly? => no broadcast */
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67 else if (addr2test == netif->ip_addr.addr)
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69 /* on the same (sub) network... */
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70 else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask))
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71 /* ...and host identifier bits are all ones? =>... */
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72 && ((addr2test & ~netif->netmask.addr) ==
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73 (IP_ADDR_BROADCAST_VALUE & ~netif->netmask.addr)))
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74 /* => network broadcast address */
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