Apple-2-SW/contiki
1
0
Fork 0
mirror of https://github.com/oliverschmidt/contiki.git synced 2024-12-22 10:30:13 +00:00
Code Issues Projects Releases Wiki Activity

Added MAC header to handle padding

Browse Source
This commit is contained in:
nifi 2010-04-26 17:46:21 +00:00
parent 0d5b01d304
commit d761b6e89a
1 changed files with 93 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

105
core/net/mac/contikimac.c
View File

@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: contikimac.c,v 1.33 2010/04/20 11:41:16 nifi Exp $
* $Id: contikimac.c,v 1.34 2010/04/26 17:46:21 nifi Exp $
*/
/**
@ -69,6 +69,9 @@
#ifndef WITH_STREAMING
#define WITH_STREAMING 1
#endif
#ifndef WITH_CONTIKIMAC_HEADER
#define WITH_CONTIKIMAC_HEADER 1
#endif
struct announcement_data {
uint16_t id;
@ -79,6 +82,15 @@ struct announcement_data {
message - may need to be increased in the future. */
#define ANNOUNCEMENT_MAX 10
#if WITH_CONTIKIMAC_HEADER
#define CONTIKIMAC_ID 0x00
struct hdr {
uint8_t id;
uint8_t len;
};
#endif /* WITH_CONTIKIMAC_HEADER */
/* The structure of the announcement messages. */
struct announcement_msg {
uint8_t announcement_magic[2];
@ -550,6 +562,9 @@ send_packet(mac_callback_t mac_callback, void *mac_callback_ptr)
int transmit_len;
int i;
int ret;
#if WITH_CONTIKIMAC_HEADER
struct hdr *chdr;
#endif /* WITH_CONTIKIMAC_HEADER */
if(packetbuf_totlen() == 0) {
PRINTF("contikimac: send_packet data len 0\n");
@ -606,6 +621,28 @@ send_packet(mac_callback_t mac_callback, void *mac_callback_ptr)
if(is_streaming) {
packetbuf_set_attr(PACKETBUF_ATTR_PENDING, 1);
}
#if WITH_CONTIKIMAC_HEADER
hdrlen = packetbuf_totlen();
if(packetbuf_hdralloc(sizeof(struct hdr)) == 0) {
/* Failed to allocate space for contikimac header */
PRINTF("contikimac: send failed, too large header\n");
return MAC_TX_ERR_FATAL;
}
chdr = packetbuf_hdrptr();
chdr->id = CONTIKIMAC_ID;
chdr->len = hdrlen;
/* Create the MAC header for the data packet. */
hdrlen = NETSTACK_FRAMER.create();
if(hdrlen == 0) {
/* Failed to send */
PRINTF("contikimac: send failed, too large header\n");
packetbuf_hdr_remove(sizeof(struct hdr));
return MAC_TX_ERR_FATAL;
}
hdrlen += sizeof(struct hdr);
#else /* WITH_CONTIKIMAC_HEADER */
/* Create the MAC header for the data packet. */
hdrlen = NETSTACK_FRAMER.create();
if(hdrlen == 0) {
@ -613,19 +650,27 @@ send_packet(mac_callback_t mac_callback, void *mac_callback_ptr)
PRINTF("contikimac: send failed, too large header\n");
return MAC_TX_ERR_FATAL;
}
#endif /* WITH_CONTIKIMAC_HEADER */
/* Make sure that the packet is longer or equal to the shorest
/* Make sure that the packet is longer or equal to the shortest
packet length. */
if(packetbuf_totlen() < SHORTEST_PACKET_SIZE) {
transmit_len = packetbuf_totlen();
if(transmit_len < SHORTEST_PACKET_SIZE) {
#if 0
/* Pad with zeroes */
uint8_t *ptr;
ptr = packetbuf_dataptr();
memset(ptr + packetbuf_datalen(), 0, SHORTEST_PACKET_SIZE - packetbuf_totlen());
#endif
PRINTF("contikimac: shorter than shortest (%d)\n", packetbuf_totlen());
packetbuf_set_datalen(SHORTEST_PACKET_SIZE);
transmit_len = SHORTEST_PACKET_SIZE;
}
packetbuf_compact();
NETSTACK_RADIO.prepare(packetbuf_hdrptr(), packetbuf_totlen());
transmit_len = packetbuf_totlen();
NETSTACK_RADIO.prepare(packetbuf_hdrptr(), transmit_len);
/* Remove the MAC-layer header since it will be recreated next time around. */
packetbuf_hdr_remove(hdrlen);
@ -880,7 +925,19 @@ input_packet(void)
if(packetbuf_totlen() > 0 && NETSTACK_FRAMER.parse()) {
#if WITH_CONTIKIMAC_HEADER
struct hdr *chdr;
int len;
chdr = packetbuf_dataptr();
if(chdr->id != CONTIKIMAC_ID) {
PRINTF("contikimac: failed to parse hdr (%u)\n", packetbuf_totlen());
return;
}
packetbuf_hdrreduce(sizeof(struct hdr));
packetbuf_set_datalen(chdr->len);
#endif /* WITH_CONTIKIMAC_HEADER */
if(packetbuf_datalen() > 0 &&
packetbuf_totlen() > 0 &&
(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
@ -963,6 +1020,10 @@ static void
send_announcement(void *ptr)
{
int announcement_len;
int transmit_len;
#if WITH_CONTIKIMAC_HEADER
struct hdr *chdr
#endif /* WITH_CONTIKIMAC_HEADER */
/* Set up the probe header. */
packetbuf_clear();
@ -975,6 +1036,18 @@ send_announcement(void *ptr)
packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, &rimeaddr_null);
packetbuf_set_attr(PACKETBUF_ATTR_RADIO_TXPOWER,
announcement_radio_txpower);
#if WITH_CONTIKIMAC_HEADER
transmit_len = packetbuf_totlen();
if(packetbuf_hdralloc(sizeof(struct hdr)) == 0) {
/* Failed to allocate space for contikimac header */
PRINTF("contikimac: send announcement failed, too large header\n");
return;
}
chdr = packetbuf_hdrptr();
chdr->id = CONTIKIMAC_ID;
chdr->len = transmit_len;
#endif /* WITH_CONTIKIMAC_HEADER */
if(NETSTACK_FRAMER.create()) {
rtimer_clock_t t;
int i, collisions;
@ -982,9 +1055,17 @@ send_announcement(void *ptr)
/* Make sure that the packet is longer or equal to the shorest
packet length. */
if(packetbuf_totlen() < SHORTEST_PACKET_SIZE) {
transmit_len = packetbuf_totlen();
if(transmit_len < SHORTEST_PACKET_SIZE) {
#if 0
/* Pad with zeroes */
uint8_t *ptr;
ptr = packetbuf_dataptr();
memset(ptr + packetbuf_datalen(), 0, SHORTEST_PACKET_SIZE - packetbuf_totlen());
#endif
PRINTF("contikimac: shorter than shortest (%d)\n", packetbuf_totlen());
packetbuf_set_datalen(SHORTEST_PACKET_SIZE);
transmit_len = packetbuf_totlen() + (SHORTEST_PACKET_SIZE - packetbuf_totlen());
}
collisions = 0;
@ -1012,16 +1093,16 @@ send_announcement(void *ptr)
if(collisions == 0) {
NETSTACK_RADIO.prepare(packetbuf_hdrptr(), packetbuf_totlen());
NETSTACK_RADIO.prepare(packetbuf_hdrptr(), transmit_len);
NETSTACK_RADIO.transmit(packetbuf_totlen());
NETSTACK_RADIO.transmit(transmit_len);
t = RTIMER_NOW();
#if NURTIMER
while(RTIMER_CLOCK_LT(t, RTIMER_NOW(), t + INTER_PACKET_INTERVAL));
#else
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t + INTER_PACKET_INTERVAL)) { }
#endif
NETSTACK_RADIO.transmit(packetbuf_totlen());
NETSTACK_RADIO.transmit(transmit_len);
}
we_are_sending = 0;
}