2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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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.
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11 * this list of conditions and the following disclaimer in the documentation
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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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 /* 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 };
41 /* Determine if an address is a broadcast address on a network interface
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
49 u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif)
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))
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 */
60 /* address matches network interface address exactly? => no broadcast */
61 else if (addr->addr == netif->ip_addr.addr)
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 */