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/*
* Copyright (C) 2016 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @{
*
* @file
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#include <stddef.h>
#include "od.h"
#include "net/gnrc.h"
#include "net/ieee802154.h"
#include "net/gnrc/netdev2/ieee802154.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
static gnrc_pktsnip_t *_recv(gnrc_netdev2_t *gnrc_netdev2);
static int _send(gnrc_netdev2_t *gnrc_netdev2, gnrc_pktsnip_t *pkt);
int gnrc_netdev2_ieee802154_init(gnrc_netdev2_t *gnrc_netdev2,
netdev2_ieee802154_t *dev)
{
gnrc_netdev2->send = _send;
gnrc_netdev2->recv = _recv;
gnrc_netdev2->dev = (netdev2_t *)dev;
return 0;
}
static gnrc_pktsnip_t *_make_netif_hdr(uint8_t *mhr)
{
gnrc_pktsnip_t *snip;
uint8_t src[IEEE802154_LONG_ADDRESS_LEN], dst[IEEE802154_LONG_ADDRESS_LEN];
int src_len, dst_len;
le_uint16_t _pan_tmp; /* TODO: hand-up PAN IDs to GNRC? */
dst_len = ieee802154_get_dst(mhr, dst, &_pan_tmp);
src_len = ieee802154_get_src(mhr, src, &_pan_tmp);
if ((dst_len < 0) || (src_len < 0)) {
DEBUG("_make_netif_hdr: unable to get addresses\n");
return NULL;
}
/* allocate space for header */
snip = gnrc_netif_hdr_build(src, (size_t)src_len, dst, (size_t)dst_len);
if (snip == NULL) {
DEBUG("_make_netif_hdr: no space left in packet buffer\n");
return NULL;
}
/* set broadcast flag for broadcast destination */
if ((dst_len == 2) && (dst[0] == 0xff) && (dst[1] == 0xff)) {
gnrc_netif_hdr_t *hdr = snip->data;
hdr->flags |= GNRC_NETIF_HDR_FLAGS_BROADCAST;
}
return snip;
}
static gnrc_pktsnip_t *_recv(gnrc_netdev2_t *gnrc_netdev2)
{
netdev2_t *netdev = gnrc_netdev2->dev;
netdev2_ieee802154_rx_info_t rx_info;
netdev2_ieee802154_t *state = (netdev2_ieee802154_t *)gnrc_netdev2->dev;
gnrc_pktsnip_t *pkt = NULL;
int bytes_expected = netdev->driver->recv(netdev, NULL, 0, NULL);
if (bytes_expected > 0) {
int nread;
pkt = gnrc_pktbuf_add(NULL, NULL, bytes_expected, GNRC_NETTYPE_UNDEF);
if (pkt == NULL) {
DEBUG("_recv_ieee802154: cannot allocate pktsnip.\n");
return NULL;
}
nread = netdev->driver->recv(netdev, pkt->data, bytes_expected, &rx_info);
if (nread <= 0) {
gnrc_pktbuf_release(pkt);
return NULL;
}
if (!(state->flags & NETDEV2_IEEE802154_RAW)) {
gnrc_pktsnip_t *ieee802154_hdr, *netif_hdr;
gnrc_netif_hdr_t *hdr;
#if ENABLE_DEBUG
char src_str[GNRC_NETIF_HDR_L2ADDR_PRINT_LEN];
#endif
size_t mhr_len = ieee802154_get_frame_hdr_len(pkt->data);
if (mhr_len == 0) {
DEBUG("_recv_ieee802154: illegally formatted frame received\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
nread -= mhr_len;
/* mark IEEE 802.15.4 header */
ieee802154_hdr = gnrc_pktbuf_mark(pkt, mhr_len, GNRC_NETTYPE_UNDEF);
if (ieee802154_hdr == NULL) {
DEBUG("_recv_ieee802154: no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
netif_hdr = _make_netif_hdr(ieee802154_hdr->data);
if (netif_hdr == NULL) {
DEBUG("_recv_ieee802154: no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
hdr = netif_hdr->data;
hdr->lqi = rx_info.lqi;
hdr->rssi = rx_info.rssi;
hdr->if_pid = thread_getpid();
pkt->type = state->proto;
#if ENABLE_DEBUG
DEBUG("_recv_ieee802154: received packet from %s of length %u\n",
gnrc_netif_addr_to_str(src_str, sizeof(src_str),
gnrc_netif_hdr_get_src_addr(hdr),
hdr->src_l2addr_len),
nread);
#if defined(MODULE_OD)
od_hex_dump(pkt->data, nread, OD_WIDTH_DEFAULT);
#endif
#endif
gnrc_pktbuf_remove_snip(pkt, ieee802154_hdr);
LL_APPEND(pkt, netif_hdr);
}
DEBUG("_recv_ieee802154: reallocating.\n");
gnrc_pktbuf_realloc_data(pkt, nread);
}
return pkt;
}
static int _send(gnrc_netdev2_t *gnrc_netdev2, gnrc_pktsnip_t *pkt)
{
netdev2_t *netdev = gnrc_netdev2->dev;
netdev2_ieee802154_t *state = (netdev2_ieee802154_t *)gnrc_netdev2->dev;
gnrc_netif_hdr_t *netif_hdr;
gnrc_pktsnip_t *vec_snip;
const uint8_t *src, *dst = NULL;
int res = 0;
size_t n, src_len, dst_len;
uint8_t mhr[IEEE802154_MAX_HDR_LEN];
uint8_t flags = (uint8_t)(state->flags & NETDEV2_IEEE802154_SEND_MASK);
le_uint16_t dev_pan = byteorder_btols(byteorder_htons(state->pan));
flags |= IEEE802154_FCF_TYPE_DATA;
if (pkt == NULL) {
DEBUG("_send_ieee802154: pkt was NULL\n");
return -EINVAL;
}
if (pkt->type != GNRC_NETTYPE_NETIF) {
DEBUG("_send_ieee802154: first header is not generic netif header\n");
return -EBADMSG;
}
netif_hdr = pkt->data;
/* prepare destination address */
if (netif_hdr->flags & /* If any of these flags is set so this is correct */
(GNRC_NETIF_HDR_FLAGS_BROADCAST | GNRC_NETIF_HDR_FLAGS_MULTICAST)) {
dst = ieee802154_addr_bcast;
dst_len = IEEE802154_ADDR_BCAST_LEN;
}
else {
dst = gnrc_netif_hdr_get_dst_addr(netif_hdr);
dst_len = netif_hdr->dst_l2addr_len;
}
src_len = netif_hdr->src_l2addr_len;
if (src_len > 0) {
src = gnrc_netif_hdr_get_src_addr(netif_hdr);
}
else if (state->flags & NETDEV2_IEEE802154_SRC_MODE_LONG) {
src_len = IEEE802154_LONG_ADDRESS_LEN;
src = state->long_addr;
}
else {
src_len = IEEE802154_SHORT_ADDRESS_LEN;
src = state->short_addr;
}
/* fill MAC header, seq should be set by device */
if ((res = ieee802154_set_frame_hdr(mhr, src, src_len,
dst, dst_len, dev_pan,
dev_pan, flags, state->seq++)) == 0) {
DEBUG("_send_ieee802154: Error preperaring frame\n");
return -EINVAL;
}
/* prepare packet for sending */
vec_snip = gnrc_pktbuf_get_iovec(pkt, &n);
if (vec_snip != NULL) {
struct iovec *vector;
pkt = vec_snip; /* reassign for later release; vec_snip is prepended to pkt */
vector = (struct iovec *)pkt->data;
vector[0].iov_base = mhr;
vector[0].iov_len = (size_t)res;
#ifdef MODULE_NETSTATS_L2
if (netif_hdr->flags &
(GNRC_NETIF_HDR_FLAGS_BROADCAST | GNRC_NETIF_HDR_FLAGS_MULTICAST)) {
gnrc_netdev2->dev->stats.tx_mcast_count++;
}
else {
gnrc_netdev2->dev->stats.tx_unicast_count++;
}
#endif
res = netdev->driver->send(netdev, vector, n);
}
else {
return -ENOBUFS;
}
/* release old data */
gnrc_pktbuf_release(pkt);
return res;
}
/** @} */
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