219 lines
7.5 KiB
C
219 lines
7.5 KiB
C
/*
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* Copyright (c) 2007, 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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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* A Chameleon module that produces non-optimized headers
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include <string.h>
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#include "net/rime/chameleon.h"
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#include "net/rime/rime.h"
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/* This option enables an optimization where the link addresses are
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left to the MAC RDC and not encoded in the Chameleon header.
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Note: this requires that the underlying MAC layer to add link
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addresses and will not work together with for example nullrdc.
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*/
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#ifdef CHAMELEON_CONF_WITH_MAC_LINK_ADDRESSES
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#define CHAMELEON_WITH_MAC_LINK_ADDRESSES CHAMELEON_CONF_WITH_MAC_LINK_ADDRESSES
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#else /* !CHAMELEON_CONF_WITH_MAC_LINK_ADDRESSES */
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#define CHAMELEON_WITH_MAC_LINK_ADDRESSES 0
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#endif /* !CHAMELEON_CONF_WITH_MAC_LINK_ADDRESSES */
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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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#else
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#define PRINTF(...)
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#endif
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struct raw_hdr {
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uint8_t channel[2];
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};
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/*---------------------------------------------------------------------------*/
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static struct channel *
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input(void)
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{
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const struct packetbuf_attrlist *a;
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int byteptr, bitptr, len;
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uint8_t *hdrptr;
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struct raw_hdr *hdr;
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struct channel *c;
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/* The packet has a header that tells us what channel the packet is
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for. */
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hdr = (struct raw_hdr *)packetbuf_dataptr();
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if(packetbuf_hdrreduce(sizeof(struct raw_hdr)) == 0) {
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PRINTF("chameleon-raw: too short packet\n");
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return NULL;
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}
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c = channel_lookup((hdr->channel[1] << 8) + hdr->channel[0]);
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if(c == NULL) {
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PRINTF("chameleon-raw: input: channel %u not found\n",
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(hdr->channel[1] << 8) + hdr->channel[0]);
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return NULL;
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}
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hdrptr = packetbuf_dataptr();
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if(packetbuf_hdrreduce(c->hdrsize) == 0) {
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PRINTF("chameleon-raw: too short packet\n");
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return NULL;
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}
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byteptr = bitptr = 0;
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for(a = c->attrlist; a->type != PACKETBUF_ATTR_NONE; ++a) {
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#if CHAMELEON_WITH_MAC_LINK_ADDRESSES
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if(a->type == PACKETBUF_ADDR_SENDER ||
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a->type == PACKETBUF_ADDR_RECEIVER) {
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/* Let the link layer handle sender and receiver */
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continue;
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}
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#endif /* CHAMELEON_WITH_MAC_LINK_ADDRESSES */
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PRINTF("%d.%d: unpack_header type %d, len %d\n",
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linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
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a->type, a->len);
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len = (a->len & 0xf8) + ((a->len & 7) ? 8: 0);
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if(PACKETBUF_IS_ADDR(a->type)) {
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const linkaddr_t addr;
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memcpy((uint8_t *)&addr, &hdrptr[byteptr], len / 8);
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PRINTF("%d.%d: unpack_header type %d, addr %d.%d\n",
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linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
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a->type, addr.u8[0], addr.u8[1]);
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packetbuf_set_addr(a->type, &addr);
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} else {
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packetbuf_attr_t val = 0;
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memcpy((uint8_t *)&val, &hdrptr[byteptr], len / 8);
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packetbuf_set_attr(a->type, val);
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PRINTF("%d.%d: unpack_header type %d, val %d\n",
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linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
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a->type, val);
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}
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byteptr += len / 8;
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}
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return c;
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}
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/*---------------------------------------------------------------------------*/
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static int
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output(struct channel *c)
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{
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const struct packetbuf_attrlist *a;
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int byteptr, len;
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uint8_t *hdrptr;
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struct raw_hdr *hdr;
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/* Compute the total size of the final header by summing the size of
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all attributes that are used on this channel. */
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if(packetbuf_hdralloc(c->hdrsize + sizeof(struct raw_hdr)) == 0) {
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PRINTF("chameleon-raw: insufficient space for headers\n");
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return 0;
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}
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hdr = (struct raw_hdr *)packetbuf_hdrptr();
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hdr->channel[0] = c->channelno & 0xff;
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hdr->channel[1] = (c->channelno >> 8) & 0xff;
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hdrptr = ((uint8_t *)packetbuf_hdrptr()) + sizeof(struct raw_hdr);
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byteptr = 0;
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for(a = c->attrlist; a->type != PACKETBUF_ATTR_NONE; ++a) {
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#if CHAMELEON_WITH_MAC_LINK_ADDRESSES
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if(a->type == PACKETBUF_ADDR_SENDER ||
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a->type == PACKETBUF_ADDR_RECEIVER) {
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/* Let the link layer handle sender and receiver */
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PRINTF("%d.%d: pack_header leaving sender/receiver to link layer\n");
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continue;
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}
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#endif /* CHAMELEON_WITH_MAC_LINK_ADDRESSES */
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PRINTF("%d.%d: pack_header type %d, len %d\n",
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linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
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a->type, a->len);
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len = (a->len & 0xf8) + ((a->len & 7) ? 8: 0);
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if(PACKETBUF_IS_ADDR(a->type)) {
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const linkaddr_t *linkaddr;
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/* memcpy(&hdrptr[byteptr], (uint8_t *)packetbuf_attr_aget(a->type), len / 8);*/
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linkaddr = packetbuf_addr(a->type);
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hdrptr[byteptr] = linkaddr->u8[0];
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hdrptr[byteptr + 1] = linkaddr->u8[1];
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PRINTF("%d.%d: address %d.%d\n",
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linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
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((uint8_t *)packetbuf_addr(a->type))[0],
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((uint8_t *)packetbuf_addr(a->type))[1]);
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} else {
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packetbuf_attr_t val;
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val = packetbuf_attr(a->type);
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memcpy(&hdrptr[byteptr], &val, len / 8);
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PRINTF("%d.%d: value %d\n",
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linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
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val);
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}
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byteptr += len / 8;
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}
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return 1; /* Send out packet */
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}
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/*---------------------------------------------------------------------------*/
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static int
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hdrsize(const struct packetbuf_attrlist *a)
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{
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int size, len;
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/* Compute the total size of the final header by summing the size of
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all attributes that are used on this channel. */
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size = 0;
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for(; a->type != PACKETBUF_ATTR_NONE; ++a) {
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/* PRINTF("chameleon header_size: header type %d len %d\n",
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a->type, a->len);*/
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#if CHAMELEON_WITH_MAC_LINK_ADDRESSES
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if(a->type == PACKETBUF_ADDR_SENDER ||
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a->type == PACKETBUF_ADDR_RECEIVER) {
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/* Let the mac layer handle the sender and receiver */
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continue;
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}
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#endif /* CHAMELEON_WITH_MAC_LINK_ADDRESSES */
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len = a->len;
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if(len < 8) {
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len = 8;
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}
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size += len;
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}
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return size / 8;
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}
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/*---------------------------------------------------------------------------*/
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CC_CONST_FUNCTION struct chameleon_module chameleon_raw = { input, output,
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hdrsize };
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