Pehr Hovey
Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
Core/lwIP/core/ipv4/ip_addr.c@0:a548a085de55, 2010-03-14 (annotated)
- Committer:
- pehrhovey
- Date:
- Sun Mar 14 00:54:12 2010 +0000
- Revision:
- 0:a548a085de55
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| pehrhovey | 0:a548a085de55 | 1 | /** |
| pehrhovey | 0:a548a085de55 | 2 | * @file |
| pehrhovey | 0:a548a085de55 | 3 | * This is the IPv4 address tools implementation. |
| pehrhovey | 0:a548a085de55 | 4 | * |
| pehrhovey | 0:a548a085de55 | 5 | */ |
| pehrhovey | 0:a548a085de55 | 6 | |
| pehrhovey | 0:a548a085de55 | 7 | /* |
| pehrhovey | 0:a548a085de55 | 8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| pehrhovey | 0:a548a085de55 | 9 | * All rights reserved. |
| pehrhovey | 0:a548a085de55 | 10 | * |
| pehrhovey | 0:a548a085de55 | 11 | * Redistribution and use in source and binary forms, with or without modification, |
| pehrhovey | 0:a548a085de55 | 12 | * are permitted provided that the following conditions are met: |
| pehrhovey | 0:a548a085de55 | 13 | * |
| pehrhovey | 0:a548a085de55 | 14 | * 1. Redistributions of source code must retain the above copyright notice, |
| pehrhovey | 0:a548a085de55 | 15 | * this list of conditions and the following disclaimer. |
| pehrhovey | 0:a548a085de55 | 16 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| pehrhovey | 0:a548a085de55 | 17 | * this list of conditions and the following disclaimer in the documentation |
| pehrhovey | 0:a548a085de55 | 18 | * and/or other materials provided with the distribution. |
| pehrhovey | 0:a548a085de55 | 19 | * 3. The name of the author may not be used to endorse or promote products |
| pehrhovey | 0:a548a085de55 | 20 | * derived from this software without specific prior written permission. |
| pehrhovey | 0:a548a085de55 | 21 | * |
| pehrhovey | 0:a548a085de55 | 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| pehrhovey | 0:a548a085de55 | 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| pehrhovey | 0:a548a085de55 | 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| pehrhovey | 0:a548a085de55 | 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| pehrhovey | 0:a548a085de55 | 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| pehrhovey | 0:a548a085de55 | 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| pehrhovey | 0:a548a085de55 | 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| pehrhovey | 0:a548a085de55 | 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| pehrhovey | 0:a548a085de55 | 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| pehrhovey | 0:a548a085de55 | 31 | * OF SUCH DAMAGE. |
| pehrhovey | 0:a548a085de55 | 32 | * |
| pehrhovey | 0:a548a085de55 | 33 | * This file is part of the lwIP TCP/IP stack. |
| pehrhovey | 0:a548a085de55 | 34 | * |
| pehrhovey | 0:a548a085de55 | 35 | * Author: Adam Dunkels <adam@sics.se> |
| pehrhovey | 0:a548a085de55 | 36 | * |
| pehrhovey | 0:a548a085de55 | 37 | */ |
| pehrhovey | 0:a548a085de55 | 38 | |
| pehrhovey | 0:a548a085de55 | 39 | #include "lwip/opt.h" |
| pehrhovey | 0:a548a085de55 | 40 | #include "lwip/ip_addr.h" |
| pehrhovey | 0:a548a085de55 | 41 | #include "lwip/inet.h" |
| pehrhovey | 0:a548a085de55 | 42 | #include "lwip/netif.h" |
| pehrhovey | 0:a548a085de55 | 43 | |
| pehrhovey | 0:a548a085de55 | 44 | #define IP_ADDR_ANY_VALUE 0x00000000UL |
| pehrhovey | 0:a548a085de55 | 45 | #define IP_ADDR_BROADCAST_VALUE 0xffffffffUL |
| pehrhovey | 0:a548a085de55 | 46 | |
| pehrhovey | 0:a548a085de55 | 47 | /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */ |
| pehrhovey | 0:a548a085de55 | 48 | const struct ip_addr ip_addr_any = { IP_ADDR_ANY_VALUE }; |
| pehrhovey | 0:a548a085de55 | 49 | const struct ip_addr ip_addr_broadcast = { IP_ADDR_BROADCAST_VALUE }; |
| pehrhovey | 0:a548a085de55 | 50 | |
| pehrhovey | 0:a548a085de55 | 51 | /** |
| pehrhovey | 0:a548a085de55 | 52 | * Determine if an address is a broadcast address on a network interface |
| pehrhovey | 0:a548a085de55 | 53 | * |
| pehrhovey | 0:a548a085de55 | 54 | * @param addr address to be checked |
| pehrhovey | 0:a548a085de55 | 55 | * @param netif the network interface against which the address is checked |
| pehrhovey | 0:a548a085de55 | 56 | * @return returns non-zero if the address is a broadcast address |
| pehrhovey | 0:a548a085de55 | 57 | */ |
| pehrhovey | 0:a548a085de55 | 58 | u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 59 | { |
| pehrhovey | 0:a548a085de55 | 60 | u32_t addr2test; |
| pehrhovey | 0:a548a085de55 | 61 | |
| pehrhovey | 0:a548a085de55 | 62 | addr2test = addr->addr; |
| pehrhovey | 0:a548a085de55 | 63 | /* all ones (broadcast) or all zeroes (old skool broadcast) */ |
| pehrhovey | 0:a548a085de55 | 64 | if ((~addr2test == IP_ADDR_ANY_VALUE) || |
| pehrhovey | 0:a548a085de55 | 65 | (addr2test == IP_ADDR_ANY_VALUE)) |
| pehrhovey | 0:a548a085de55 | 66 | return 1; |
| pehrhovey | 0:a548a085de55 | 67 | /* no broadcast support on this network interface? */ |
| pehrhovey | 0:a548a085de55 | 68 | else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) |
| pehrhovey | 0:a548a085de55 | 69 | /* the given address cannot be a broadcast address |
| pehrhovey | 0:a548a085de55 | 70 | * nor can we check against any broadcast addresses */ |
| pehrhovey | 0:a548a085de55 | 71 | return 0; |
| pehrhovey | 0:a548a085de55 | 72 | /* address matches network interface address exactly? => no broadcast */ |
| pehrhovey | 0:a548a085de55 | 73 | else if (addr2test == netif->ip_addr.addr) |
| pehrhovey | 0:a548a085de55 | 74 | return 0; |
| pehrhovey | 0:a548a085de55 | 75 | /* on the same (sub) network... */ |
| pehrhovey | 0:a548a085de55 | 76 | else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask)) |
| pehrhovey | 0:a548a085de55 | 77 | /* ...and host identifier bits are all ones? =>... */ |
| pehrhovey | 0:a548a085de55 | 78 | && ((addr2test & ~netif->netmask.addr) == |
| pehrhovey | 0:a548a085de55 | 79 | (IP_ADDR_BROADCAST_VALUE & ~netif->netmask.addr))) |
| pehrhovey | 0:a548a085de55 | 80 | /* => network broadcast address */ |
| pehrhovey | 0:a548a085de55 | 81 | return 1; |
| pehrhovey | 0:a548a085de55 | 82 | else |
| pehrhovey | 0:a548a085de55 | 83 | return 0; |
| pehrhovey | 0:a548a085de55 | 84 | } |