372 lines
11 KiB
C
372 lines
11 KiB
C
/*
|
|
* 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 bit-optimized headers
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
#include "net/rime/chameleon.h"
|
|
|
|
#include "net/rime/rime.h"
|
|
|
|
#include <string.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 */
|
|
|
|
struct bitopt_hdr {
|
|
uint8_t channel[2];
|
|
};
|
|
|
|
static const uint8_t bitmask[9] = { 0x00, 0x80, 0xc0, 0xe0, 0xf0,
|
|
0xf8, 0xfc, 0xfe, 0xff };
|
|
|
|
#define DEBUG 0
|
|
#if DEBUG
|
|
#include <stdio.h>
|
|
#define PRINTF(...) printf(__VA_ARGS__)
|
|
#else
|
|
#define PRINTF(...)
|
|
#endif
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
uint8_t CC_INLINE
|
|
get_bits_in_byte(uint8_t *from, int bitpos, int vallen)
|
|
{
|
|
uint16_t shifted_val;
|
|
|
|
shifted_val = (from[0] << 8) | from[1];
|
|
|
|
/* PRINTF("get_bits_in_byte: from[0] 0x%02x from[1] 0x%02x shifted_val 0x%04x, return 0x%02x vallen %d\n",
|
|
from[0], from[1], shifted_val,
|
|
(((shifted_val << bitpos) >> 8) & bitmask[vallen]) >> (8 - vallen),
|
|
vallen
|
|
);*/
|
|
|
|
return (((shifted_val << bitpos) >> 8) & bitmask[vallen]) >> (8 - vallen);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
get_bits(uint8_t *to, uint8_t *from, int bitpos, int vallen)
|
|
{
|
|
int i, bits;
|
|
|
|
|
|
if(vallen < 8) {
|
|
*to = get_bits_in_byte(from, bitpos, vallen);
|
|
} else {
|
|
if(bitpos == 0) {
|
|
for(i = 0; i < vallen / 8; ++i) {
|
|
/* PRINTF("get_bits i %d val 0x%02x\n",
|
|
i, from[i]);*/
|
|
to[i] = from[i];
|
|
}
|
|
bits = vallen & 7;
|
|
if(bits) {
|
|
to[i] = get_bits_in_byte(&from[i], 0, bits);
|
|
}
|
|
} else {
|
|
for(i = 0; i < vallen / 8; ++i) {
|
|
/* PRINTF("get_bits i %d val 0x%02x bitpos %d\n",
|
|
i, from[i], bitpos);*/
|
|
to[i] = get_bits_in_byte(&from[i], bitpos, 8);
|
|
}
|
|
bits = vallen & 7;
|
|
if(bits) {
|
|
to[i] = get_bits_in_byte(&from[i], bitpos, bits);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
header_size(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) {
|
|
#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 */
|
|
/* PRINTF("chameleon header_size: header type %d len %d\n",
|
|
a->type, a->len);*/
|
|
len = a->len;
|
|
/* if(len < 8) {
|
|
len = 8;
|
|
}*/
|
|
size += len;
|
|
}
|
|
return size;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void CC_INLINE
|
|
set_bits_in_byte(uint8_t *target, int bitpos, uint8_t val, int vallen)
|
|
{
|
|
unsigned short shifted_val;
|
|
shifted_val = val << (8 - bitpos + 8 - vallen);
|
|
/* printf("set_bits_in_byte before target[0] 0x%02x target[1] 0x%02x shifted_val 0x%04x val 0x%02x vallen %d\n",
|
|
target[0], target[1], shifted_val, val, vallen);*/
|
|
target[0] |= shifted_val >> 8;
|
|
target[1] |= shifted_val & 0xff;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
set_bits(uint8_t *ptr, int bitpos, uint8_t *val, int vallen)
|
|
{
|
|
int i, bits;
|
|
|
|
/* PRINTF("set_bits %p bitpos %d, val %p len %d\n",
|
|
ptr, bitpos, val, vallen);*/
|
|
|
|
if(vallen < 8) {
|
|
set_bits_in_byte(ptr, bitpos, *val /*>> (8 - vallen)*/, vallen);
|
|
} else {
|
|
if(bitpos == 0) {
|
|
for(i = 0; i < vallen / 8; ++i) {
|
|
/* PRINTF("set_bits i %d val %d\n",
|
|
i, val[i]);*/
|
|
ptr[i] = val[i];
|
|
}
|
|
bits = vallen & 7;
|
|
if(bits) {
|
|
set_bits_in_byte(&ptr[i], 0, val[i] >> (8 - bits), bits);
|
|
}
|
|
} else {
|
|
for(i = 0; i < vallen / 8; ++i) {
|
|
/* PRINTF("set_bits i %d val %d\n",
|
|
i, val[i]);*/
|
|
set_bits_in_byte(&ptr[i], bitpos, val[i], 8);
|
|
}
|
|
bits = vallen & 7;
|
|
if(bits) {
|
|
set_bits_in_byte(&ptr[i], 0, val[i] >> (8 - bits + bitpos), bits);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
#if 0
|
|
static void
|
|
printbin(int n, int digits)
|
|
{
|
|
int i;
|
|
char output[128];
|
|
|
|
for(i = 0; i < digits; ++i) {
|
|
output[digits - i - 1] = (n & 1) + '0';
|
|
n >>= 1;
|
|
}
|
|
output[i] = 0;
|
|
|
|
printf(output);
|
|
}
|
|
|
|
static void
|
|
printhdr(uint8_t *hdr, int len)
|
|
{
|
|
int i, j;
|
|
|
|
j = 0;
|
|
for(i = 0; i < len; ++i) {
|
|
printbin(hdr[i], 8);
|
|
printf(", ");
|
|
++j;
|
|
if(j == 10) {
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
|
|
if(j != 0) {
|
|
printf("\n");
|
|
}
|
|
}
|
|
#endif
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
pack_header(struct channel *c)
|
|
{
|
|
const struct packetbuf_attrlist *a;
|
|
int hdrbytesize;
|
|
int byteptr, bitptr, len;
|
|
uint8_t *hdrptr;
|
|
struct bitopt_hdr *hdr;
|
|
|
|
/* Compute the total size of the final header by summing the size of
|
|
all attributes that are used on this channel. */
|
|
|
|
hdrbytesize = c->hdrsize / 8 + ((c->hdrsize & 7) == 0? 0: 1);
|
|
if(packetbuf_hdralloc(hdrbytesize + sizeof(struct bitopt_hdr)) == 0) {
|
|
PRINTF("chameleon-bitopt: insufficient space for headers\n");
|
|
return 0;
|
|
}
|
|
hdr = (struct bitopt_hdr *)packetbuf_hdrptr();
|
|
hdr->channel[0] = c->channelno & 0xff;
|
|
hdr->channel[1] = (c->channelno >> 8) & 0xff;
|
|
|
|
hdrptr = ((uint8_t *)packetbuf_hdrptr()) + sizeof(struct bitopt_hdr);
|
|
memset(hdrptr, 0, hdrbytesize);
|
|
|
|
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 */
|
|
PRINTF("%d.%d: pack_header leaving sender/receiver to link layer\n");
|
|
continue;
|
|
}
|
|
#endif /* CHAMELEON_WITH_MAC_LINK_ADDRESSES */
|
|
PRINTF("%d.%d: pack_header type %d, len %d, bitptr %d, ",
|
|
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
|
|
a->type, a->len, bitptr);
|
|
/* len = (a->len & 0xf8) + ((a->len & 7) ? 8: 0);*/
|
|
len = a->len;
|
|
byteptr = bitptr / 8;
|
|
if(PACKETBUF_IS_ADDR(a->type)) {
|
|
set_bits(&hdrptr[byteptr], bitptr & 7,
|
|
(uint8_t *)packetbuf_addr(a->type), len);
|
|
PRINTF("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);
|
|
set_bits(&hdrptr[byteptr], bitptr & 7,
|
|
(uint8_t *)&val, len);
|
|
PRINTF("value %d\n",
|
|
/*linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],*/
|
|
val);
|
|
}
|
|
/* printhdr(hdrptr, hdrbytesize);*/
|
|
bitptr += len;
|
|
}
|
|
/* printhdr(hdrptr, hdrbytesize);*/
|
|
|
|
return 1; /* Send out packet */
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static struct channel *
|
|
unpack_header(void)
|
|
{
|
|
const struct packetbuf_attrlist *a;
|
|
int byteptr, bitptr, len;
|
|
int hdrbytesize;
|
|
uint8_t *hdrptr;
|
|
struct bitopt_hdr *hdr;
|
|
struct channel *c;
|
|
|
|
|
|
/* The packet has a header that tells us what channel the packet is
|
|
for. */
|
|
hdr = (struct bitopt_hdr *)packetbuf_dataptr();
|
|
if(packetbuf_hdrreduce(sizeof(struct bitopt_hdr)) == 0) {
|
|
PRINTF("chameleon-bitopt: too short packet\n");
|
|
return NULL;
|
|
}
|
|
c = channel_lookup((hdr->channel[1] << 8) + hdr->channel[0]);
|
|
if(c == NULL) {
|
|
PRINTF("chameleon-bitopt: input: channel %u not found\n",
|
|
(hdr->channel[1] << 8) + hdr->channel[0]);
|
|
return NULL;
|
|
}
|
|
|
|
hdrptr = packetbuf_dataptr();
|
|
hdrbytesize = c->hdrsize / 8 + ((c->hdrsize & 7) == 0? 0: 1);
|
|
if(packetbuf_hdrreduce(hdrbytesize) == 0) {
|
|
PRINTF("chameleon-bitopt: 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 */
|
|
PRINTF("%d.%d: unpack_header type %d, len %d, bitptr %d\n",
|
|
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
|
|
a->type, a->len, bitptr);
|
|
/* len = (a->len & 0xf8) + ((a->len & 7) ? 8: 0);*/
|
|
len = a->len;
|
|
byteptr = bitptr / 8;
|
|
if(PACKETBUF_IS_ADDR(a->type)) {
|
|
linkaddr_t addr;
|
|
get_bits((uint8_t *)&addr, &hdrptr[byteptr], bitptr & 7, len);
|
|
PRINTF("%d.%d: unpack_header type %d, addr %d.%d\n",
|
|
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
|
|
a->type, addr.u8[0], addr.u8[1]);
|
|
packetbuf_set_addr(a->type, &addr);
|
|
} else {
|
|
packetbuf_attr_t val = 0;
|
|
get_bits((uint8_t *)&val, &hdrptr[byteptr], bitptr & 7, len);
|
|
|
|
packetbuf_set_attr(a->type, val);
|
|
PRINTF("%d.%d: unpack_header type %d, val %d\n",
|
|
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
|
|
a->type, val);
|
|
}
|
|
/* byteptr += len / 8;*/
|
|
bitptr += len;
|
|
}
|
|
return c;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
CC_CONST_FUNCTION struct chameleon_module chameleon_bitopt = {
|
|
unpack_header,
|
|
pack_header,
|
|
header_size
|
|
};
|
|
/*---------------------------------------------------------------------------*/
|