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https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP/] [core/] [ipv4/] [ip_addr.c] - Rev 622
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/* * Copyright (c) 2001-2004 Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. * * This file is part of the lwIP TCP/IP stack. * * Author: Adam Dunkels <adam@sics.se> * */ #include "lwip/ip_addr.h" #include "lwip/inet.h" #include "lwip/netif.h" #define IP_ADDR_ANY_VALUE 0x00000000UL #define IP_ADDR_BROADCAST_VALUE 0xffffffffUL /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */ const struct ip_addr ip_addr_any = { IP_ADDR_ANY_VALUE }; const struct ip_addr ip_addr_broadcast = { IP_ADDR_BROADCAST_VALUE }; /* Determine if an address is a broadcast address on a network interface * * @param addr address to be checked * @param netif the network interface against which the address is checked * @return returns non-zero if the address is a broadcast address * */ u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif) { u32_t addr2test; addr2test = addr->addr; /* all ones (broadcast) or all zeroes (old skool broadcast) */ if ((~addr2test == IP_ADDR_ANY_VALUE) || (addr2test == IP_ADDR_ANY_VALUE)) return 1; /* no broadcast support on this network interface? */ else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) /* the given address cannot be a broadcast address * nor can we check against any broadcast addresses */ return 0; /* address matches network interface address exactly? => no broadcast */ else if (addr2test == netif->ip_addr.addr) return 0; /* on the same (sub) network... */ else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask)) /* ...and host identifier bits are all ones? =>... */ && ((addr2test & ~netif->netmask.addr) == (IP_ADDR_BROADCAST_VALUE & ~netif->netmask.addr))) /* => network broadcast address */ return 1; else return 0; }
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