68730566a3
would create a header with the current packet information. This allows sicslowpan to calculate the max payload size without consuming a sequence number or clearing/restoring the packet buffer.
102 lines
3.6 KiB
C
102 lines
3.6 KiB
C
/*
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* Copyright (c) 2009, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/**
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* \file
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* MAC framer for nullmac
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* \author
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* Niclas Finne <nfi@sics.se>
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* Joakim Eriksson <joakime@sics.se>
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*/
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#include "net/mac/framer-nullmac.h"
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#include "net/packetbuf.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#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])
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#else
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#define PRINTF(...)
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#define PRINTADDR(addr)
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#endif
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struct nullmac_hdr {
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linkaddr_t receiver;
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linkaddr_t sender;
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};
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/*---------------------------------------------------------------------------*/
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static int
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hdr_length(void)
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{
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return sizeof(struct nullmac_hdr);
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}
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/*---------------------------------------------------------------------------*/
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static int
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create(void)
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{
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struct nullmac_hdr *hdr;
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if(packetbuf_hdralloc(sizeof(struct nullmac_hdr))) {
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hdr = packetbuf_hdrptr();
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linkaddr_copy(&(hdr->sender), &linkaddr_node_addr);
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linkaddr_copy(&(hdr->receiver), packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
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return sizeof(struct nullmac_hdr);
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}
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PRINTF("PNULLMAC-UT: too large header: %u\n", sizeof(struct nullmac_hdr));
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return FRAMER_FAILED;
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}
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/*---------------------------------------------------------------------------*/
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static int
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parse(void)
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{
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struct nullmac_hdr *hdr;
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hdr = packetbuf_dataptr();
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if(packetbuf_hdrreduce(sizeof(struct nullmac_hdr))) {
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packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &(hdr->sender));
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packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, &(hdr->receiver));
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PRINTF("PNULLMAC-IN: ");
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PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
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PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
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PRINTF("%u (%u)\n", packetbuf_datalen(), sizeof(struct nullmac_hdr));
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return sizeof(struct nullmac_hdr);
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}
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return FRAMER_FAILED;
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}
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/*---------------------------------------------------------------------------*/
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const struct framer framer_nullmac = {
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hdr_length, create, parse
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};
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