framer-nullmac.c

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00001 /*
00002  * Copyright (c) 2009, Swedish Institute of Computer Science.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * $Id: framer-nullmac.c,v 1.2 2010/06/14 19:19:16 adamdunkels Exp $
00030  */
00031 
00032 /**
00033  * \file
00034  *         MAC framer for nullmac
00035  * \author
00036  *         Niclas Finne <nfi@sics.se>
00037  *         Joakim Eriksson <joakime@sics.se>
00038  */
00039 
00040 #include "net/mac/framer-nullmac.h"
00041 #include "net/packetbuf.h"
00042 
00043 #define DEBUG 0
00044 
00045 #if DEBUG
00046 #include <stdio.h>
00047 #define PRINTF(...) printf(__VA_ARGS__)
00048 #define PRINTADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7])
00049 #else
00050 #define PRINTF(...)
00051 #define PRINTADDR(addr)
00052 #endif
00053 
00054 struct nullmac_hdr {
00055   rimeaddr_t receiver;
00056   rimeaddr_t sender;
00057 };
00058 
00059 /*---------------------------------------------------------------------------*/
00060 static int
00061 create(void)
00062 {
00063   struct nullmac_hdr *hdr;
00064 
00065   if(packetbuf_hdralloc(sizeof(struct nullmac_hdr))) {
00066     hdr = packetbuf_hdrptr();
00067     rimeaddr_copy(&(hdr->sender), &rimeaddr_node_addr);
00068     rimeaddr_copy(&(hdr->receiver), packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
00069     return sizeof(struct nullmac_hdr);
00070   }
00071   PRINTF("PNULLMAC-UT: too large header: %u\n", len);
00072   return 0;
00073 }
00074 /*---------------------------------------------------------------------------*/
00075 static int
00076 parse(void)
00077 {
00078   struct nullmac_hdr *hdr;
00079   hdr = packetbuf_dataptr();
00080   if(packetbuf_hdrreduce(sizeof(struct nullmac_hdr))) {
00081     packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &(hdr->sender));
00082     packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, &(hdr->receiver));
00083 
00084     PRINTF("PNULLMAC-IN: ");
00085     PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
00086     PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
00087     PRINTF("%u (%u)\n", packetbuf_datalen(), len);
00088 
00089     return sizeof(struct nullmac_hdr);
00090   }
00091   return 0;
00092 }
00093 /*---------------------------------------------------------------------------*/
00094 const struct framer framer_nullmac = {
00095   create, parse
00096 };

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