2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
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
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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.
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,
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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
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27 * This file is part of the lwIP TCP/IP stack.
29 * Author: Adam Dunkels <adam@sics.se>
33 #include "lwip/ip_addr.h"
34 #include "lwip/inet.h"
35 #include "lwip/netif.h"
37 #define IP_ADDR_ANY_VALUE 0x00000000UL
38 #define IP_ADDR_BROADCAST_VALUE 0xffffffffUL
40 /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
41 const struct ip_addr ip_addr_any = { IP_ADDR_ANY_VALUE };
42 const struct ip_addr ip_addr_broadcast = { IP_ADDR_BROADCAST_VALUE };
44 /* Determine if an address is a broadcast address on a network interface
46 * @param addr address to be checked
47 * @param netif the network interface against which the address is checked
48 * @return returns non-zero if the address is a broadcast address
52 u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif)
56 addr2test = addr->addr;
57 /* all ones (broadcast) or all zeroes (old skool broadcast) */
58 if ((~addr2test == IP_ADDR_ANY_VALUE) ||
59 (addr2test == IP_ADDR_ANY_VALUE))
61 /* no broadcast support on this network interface? */
62 else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0)
63 /* the given address cannot be a broadcast address
64 * nor can we check against any broadcast addresses */
66 /* address matches network interface address exactly? => no broadcast */
67 else if (addr2test == netif->ip_addr.addr)
69 /* on the same (sub) network... */
70 else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask))
71 /* ...and host identifier bits are all ones? =>... */
72 && ((addr2test & ~netif->netmask.addr) ==
73 (IP_ADDR_BROADCAST_VALUE & ~netif->netmask.addr)))
74 /* => network broadcast address */