/**
* @brief This function processes a received 802.11 packet and forwards it
* to kernel/upper layer
*
* @param priv A pointer to struct lbs_private
* @param skb A pointer to skb which includes the received packet
* @return 0 or -1
*/
static int process_rxed_802_11_packet(struct lbs_private *priv,
struct sk_buff *skb)
{
int ret = 0;
struct net_device *dev = priv->dev;
struct rx80211packethdr *p_rx_pkt;
struct rxpd *prxpd;
struct rx_radiotap_hdr radiotap_hdr;
struct rx_radiotap_hdr *pradiotap_hdr;
lbs_deb_enter(LBS_DEB_RX);
p_rx_pkt = (struct rx80211packethdr *) skb->data;
prxpd = &p_rx_pkt->rx_pd;
// lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100));
if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
lbs_deb_rx("rx err: frame received with bad length\n");
dev->stats.rx_length_errors++;
ret = -EINVAL;
kfree_skb(skb);
goto done;
}
/*
* Check rxpd status and update 802.3 stat,
*/
if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) {
//lbs_deb_rx("rx err: frame received with bad status\n");
dev->stats.rx_errors++;
}
lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
/* create the exported radio header */
/* radiotap header */
radiotap_hdr.hdr.it_version = 0;
/* XXX must check this value for pad */
radiotap_hdr.hdr.it_pad = 0;
radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
radiotap_hdr.flags |= IEEE80211_RADIOTAP_F_BADFCS;
radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
/* XXX must check no carryout */
radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
/* chop the rxpd */
skb_pull(skb, sizeof(struct rxpd));
/* add space for the new radio header */
if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
lbs_pr_alert("%s: couldn't pskb_expand_head\n", __func__);
ret = -ENOMEM;
kfree_skb(skb);
goto done;
}
pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
/* Take the data rate from the rxpd structure
* only if the rate is auto
*/
if (priv->enablehwauto)
priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
lbs_compute_rssi(priv, prxpd);
lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
dev->stats.rx_bytes += skb->len;
dev->stats.rx_packets++;
skb->protocol = eth_type_trans(skb, priv->rtap_net_dev);
netif_rx(skb);
ret = 0;
done:
lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
return ret;
}
/**
* @brief This function processes a received 802.11 packet and forwards it
* to kernel/upper layer
*
* @param priv A pointer to wlan_private
* @param skb A pointer to skb which includes the received packet
* @return 0 or -1
*/
static int process_rxed_802_11_packet(wlan_private * priv, struct sk_buff *skb)
{
wlan_adapter *adapter = priv->adapter;
int ret = 0;
struct rx80211packethdr *p_rx_pkt;
struct rxpd *prxpd;
struct rx_radiotap_hdr radiotap_hdr;
struct rx_radiotap_hdr *pradiotap_hdr;
lbs_deb_enter(LBS_DEB_RX);
p_rx_pkt = (struct rx80211packethdr *) skb->data;
prxpd = &p_rx_pkt->rx_pd;
// lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100));
if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
lbs_deb_rx("rx err: frame received wit bad length\n");
priv->stats.rx_length_errors++;
ret = 0;
goto done;
}
/*
* Check rxpd status and update 802.3 stat,
*/
if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) {
//lbs_deb_rx("rx err: frame received with bad status\n");
priv->stats.rx_errors++;
}
lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
/* create the exported radio header */
if(priv->adapter->monitormode == WLAN_MONITOR_OFF) {
/* no radio header */
/* chop the rxpd */
skb_pull(skb, sizeof(struct rxpd));
}
else {
/* radiotap header */
radiotap_hdr.hdr.it_version = 0;
/* XXX must check this value for pad */
radiotap_hdr.hdr.it_pad = 0;
radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
/* unknown values */
radiotap_hdr.flags = 0;
radiotap_hdr.chan_freq = 0;
radiotap_hdr.chan_flags = 0;
radiotap_hdr.antenna = 0;
/* known values */
radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
/* XXX must check no carryout */
radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
radiotap_hdr.rx_flags = 0;
if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
radiotap_hdr.rx_flags |= IEEE80211_RADIOTAP_F_RX_BADFCS;
//memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);
/* chop the rxpd */
skb_pull(skb, sizeof(struct rxpd));
/* add space for the new radio header */
if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0,
GFP_ATOMIC)) {
lbs_pr_alert("%s: couldn't pskb_expand_head\n",
__func__);
}
pradiotap_hdr =
(struct rx_radiotap_hdr *)skb_push(skb,
sizeof(struct
rx_radiotap_hdr));
memcpy(pradiotap_hdr, &radiotap_hdr,
sizeof(struct rx_radiotap_hdr));
}
/* Take the data rate from the rxpd structure
* only if the rate is auto
*/
if (adapter->auto_rate)
adapter->cur_rate = libertas_fw_index_to_data_rate(prxpd->rx_rate);
wlan_compute_rssi(priv, prxpd);
lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
priv->stats.rx_bytes += skb->len;
priv->stats.rx_packets++;
libertas_upload_rx_packet(priv, skb);
ret = 0;
done:
lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
return ret;
}
