nes-proj/core/net/rime/chameleon-raw.c

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/*
* Copyright (c) 2007, 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 Contiki operating system.
*
*/
/**
* \file
* A Chameleon module that produces non-optimized headers
* \author
* Adam Dunkels <adam@sics.se>
*/
#include <string.h>
#include "net/rime/chameleon.h"
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#include "net/rime/rime.h"
/* This option enables an optimization where the link addresses are
left to the MAC RDC and not encoded in the Chameleon header.
Note: this requires that the underlying MAC layer to add link
addresses and will not work together with for example nullrdc.
*/
#ifdef CHAMELEON_CONF_WITH_MAC_LINK_ADDRESSES
#define CHAMELEON_WITH_MAC_LINK_ADDRESSES CHAMELEON_CONF_WITH_MAC_LINK_ADDRESSES
#else /* !CHAMELEON_CONF_WITH_MAC_LINK_ADDRESSES */
#define CHAMELEON_WITH_MAC_LINK_ADDRESSES 0
#endif /* !CHAMELEON_CONF_WITH_MAC_LINK_ADDRESSES */
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
struct raw_hdr {
uint8_t channel[2];
};
/*---------------------------------------------------------------------------*/
static struct channel *
input(void)
{
const struct packetbuf_attrlist *a;
int byteptr, bitptr, len;
uint8_t *hdrptr;
struct raw_hdr *hdr;
struct channel *c;
/* The packet has a header that tells us what channel the packet is
for. */
hdr = (struct raw_hdr *)packetbuf_dataptr();
if(packetbuf_hdrreduce(sizeof(struct raw_hdr)) == 0) {
PRINTF("chameleon-raw: too short packet\n");
return NULL;
}
c = channel_lookup((hdr->channel[1] << 8) + hdr->channel[0]);
if(c == NULL) {
PRINTF("chameleon-raw: input: channel %u not found\n",
(hdr->channel[1] << 8) + hdr->channel[0]);
return NULL;
}
hdrptr = packetbuf_dataptr();
if(packetbuf_hdrreduce(c->hdrsize) == 0) {
PRINTF("chameleon-raw: too short packet\n");
return NULL;
}
byteptr = bitptr = 0;
for(a = c->attrlist; a->type != PACKETBUF_ATTR_NONE; ++a) {
#if CHAMELEON_WITH_MAC_LINK_ADDRESSES
if(a->type == PACKETBUF_ADDR_SENDER ||
a->type == PACKETBUF_ADDR_RECEIVER) {
/* Let the link layer handle sender and receiver */
continue;
}
#endif /* CHAMELEON_WITH_MAC_LINK_ADDRESSES */
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PRINTF("%d.%d: unpack_header type %d, len %d\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
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a->type, a->len);
len = (a->len & 0xf8) + ((a->len & 7) ? 8: 0);
if(PACKETBUF_IS_ADDR(a->type)) {
const linkaddr_t addr;
memcpy((uint8_t *)&addr, &hdrptr[byteptr], len / 8);
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PRINTF("%d.%d: unpack_header type %d, addr %d.%d\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
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a->type, addr.u8[0], addr.u8[1]);
packetbuf_set_addr(a->type, &addr);
} else {
packetbuf_attr_t val = 0;
memcpy((uint8_t *)&val, &hdrptr[byteptr], len / 8);
packetbuf_set_attr(a->type, val);
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PRINTF("%d.%d: unpack_header type %d, val %d\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
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a->type, val);
}
byteptr += len / 8;
}
return c;
}
/*---------------------------------------------------------------------------*/
static int
output(struct channel *c)
{
const struct packetbuf_attrlist *a;
int byteptr, len;
uint8_t *hdrptr;
struct raw_hdr *hdr;
/* Compute the total size of the final header by summing the size of
all attributes that are used on this channel. */
if(packetbuf_hdralloc(c->hdrsize + sizeof(struct raw_hdr)) == 0) {
PRINTF("chameleon-raw: insufficient space for headers\n");
return 0;
}
hdr = (struct raw_hdr *)packetbuf_hdrptr();
hdr->channel[0] = c->channelno & 0xff;
hdr->channel[1] = (c->channelno >> 8) & 0xff;
hdrptr = ((uint8_t *)packetbuf_hdrptr()) + sizeof(struct raw_hdr);
byteptr = 0;
for(a = c->attrlist; a->type != PACKETBUF_ATTR_NONE; ++a) {
#if CHAMELEON_WITH_MAC_LINK_ADDRESSES
if(a->type == PACKETBUF_ADDR_SENDER ||
a->type == PACKETBUF_ADDR_RECEIVER) {
/* Let the link layer handle sender and receiver */
PRINTF("%d.%d: pack_header leaving sender/receiver to link layer\n");
continue;
}
#endif /* CHAMELEON_WITH_MAC_LINK_ADDRESSES */
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PRINTF("%d.%d: pack_header type %d, len %d\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
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a->type, a->len);
len = (a->len & 0xf8) + ((a->len & 7) ? 8: 0);
if(PACKETBUF_IS_ADDR(a->type)) {
const linkaddr_t *linkaddr;
/* memcpy(&hdrptr[byteptr], (uint8_t *)packetbuf_attr_aget(a->type), len / 8);*/
linkaddr = packetbuf_addr(a->type);
hdrptr[byteptr] = linkaddr->u8[0];
hdrptr[byteptr + 1] = linkaddr->u8[1];
PRINTF("%d.%d: address %d.%d\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
((uint8_t *)packetbuf_addr(a->type))[0],
((uint8_t *)packetbuf_addr(a->type))[1]);
} else {
packetbuf_attr_t val;
val = packetbuf_attr(a->type);
memcpy(&hdrptr[byteptr], &val, len / 8);
PRINTF("%d.%d: value %d\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
val);
}
byteptr += len / 8;
}
return 1; /* Send out packet */
}
/*---------------------------------------------------------------------------*/
static int
hdrsize(const struct packetbuf_attrlist *a)
{
int size, len;
/* Compute the total size of the final header by summing the size of
all attributes that are used on this channel. */
size = 0;
for(; a->type != PACKETBUF_ATTR_NONE; ++a) {
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/* PRINTF("chameleon header_size: header type %d len %d\n",
a->type, a->len);*/
#if CHAMELEON_WITH_MAC_LINK_ADDRESSES
if(a->type == PACKETBUF_ADDR_SENDER ||
a->type == PACKETBUF_ADDR_RECEIVER) {
/* Let the mac layer handle the sender and receiver */
continue;
}
#endif /* CHAMELEON_WITH_MAC_LINK_ADDRESSES */
len = a->len;
if(len < 8) {
len = 8;
}
size += len;
}
return size / 8;
}
/*---------------------------------------------------------------------------*/
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CC_CONST_FUNCTION struct chameleon_module chameleon_raw = { input, output,
hdrsize };