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Commit 15745a7d authored by Stefan Rompf's avatar Stefan Rompf Committed by John W. Linville
Browse files

[PATCH] ipw2100: add radiotap headers to packtes captured in monitor mode 



Signed-off-by: default avatarStefan Rompf <stefan@loplof.de>
Signed-off-by: Andrea Merello <andreamrl at tiscali it>
Signed-off-by: default avatarZhu Yi <yi.zhu@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 171e7b2f

drivers/net/wireless/ipw2100.c

+84 −11
Original line number Diff line number Diff line
@@ -2390,15 +2390,6 @@ static void isr_rx(struct ipw2100_priv *priv, int i, 
		IPW_DEBUG_DROP("Dropping packet while interface is not up.\n");

		return;

	}

#ifdef CONFIG_IPW2100_MONITOR

	if (unlikely(priv->ieee->iw_mode == IW_MODE_MONITOR &&

		     priv->config & CFG_CRC_CHECK &&

		     status->flags & IPW_STATUS_FLAG_CRC_ERROR)) {

		IPW_DEBUG_RX("CRC error in packet.  Dropping.\n");

		priv->ieee->stats.rx_errors++;

		return;

	}

#endif



	if (unlikely(priv->ieee->iw_mode != IW_MODE_MONITOR &&

		     !(priv->status & STATUS_ASSOCIATED))) {
@@ -2446,6 +2437,88 @@ static void isr_rx(struct ipw2100_priv *priv, int i, 
	priv->rx_queue.drv[i].host_addr = packet->dma_addr;

}



#ifdef CONFIG_IPW2100_MONITOR



static void isr_rx_monitor(struct ipw2100_priv *priv, int i,

		   struct ieee80211_rx_stats *stats)

{

	struct ipw2100_status *status = &priv->status_queue.drv[i];

	struct ipw2100_rx_packet *packet = &priv->rx_buffers[i];



	IPW_DEBUG_RX("Handler...\n");



	/* Magic struct that slots into the radiotap header -- no reason

	 * to build this manually element by element, we can write it much

	 * more efficiently than we can parse it. ORDER MATTERS HERE */

	struct ipw_rt_hdr {

		struct ieee80211_radiotap_header rt_hdr;

		s8 rt_dbmsignal; /* signal in dbM, kluged to signed */

	} *ipw_rt;



	if (unlikely(status->frame_size > skb_tailroom(packet->skb) - sizeof(struct ipw_rt_hdr))) {

		IPW_DEBUG_INFO("%s: frame_size (%u) > skb_tailroom (%u)!"

			       "  Dropping.\n",

			       priv->net_dev->name,

			       status->frame_size, skb_tailroom(packet->skb));

		priv->ieee->stats.rx_errors++;

		return;

	}



	if (unlikely(!netif_running(priv->net_dev))) {

		priv->ieee->stats.rx_errors++;

		priv->wstats.discard.misc++;

		IPW_DEBUG_DROP("Dropping packet while interface is not up.\n");

		return;

	}



	if (unlikely(priv->config & CFG_CRC_CHECK &&

		     status->flags & IPW_STATUS_FLAG_CRC_ERROR)) {

		IPW_DEBUG_RX("CRC error in packet.  Dropping.\n");

		priv->ieee->stats.rx_errors++;

		return;

	}



	pci_unmap_single(priv->pci_dev,

			 packet->dma_addr,

			 sizeof(struct ipw2100_rx), PCI_DMA_FROMDEVICE);

	memmove(packet->skb->data + sizeof(struct ipw_rt_hdr),

		packet->skb->data, status->frame_size);



	ipw_rt = (struct ipw_rt_hdr *) packet->skb->data;



	ipw_rt->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;

	ipw_rt->rt_hdr.it_pad = 0; /* always good to zero */

	ipw_rt->rt_hdr.it_len = sizeof(struct ipw_rt_hdr); /* total header+data */



	ipw_rt->rt_hdr.it_present = 1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL;



	ipw_rt->rt_dbmsignal = status->rssi + IPW2100_RSSI_TO_DBM;



	skb_put(packet->skb, status->frame_size + sizeof(struct ipw_rt_hdr));



	if (!ieee80211_rx(priv->ieee, packet->skb, stats)) {

		priv->ieee->stats.rx_errors++;



		/* ieee80211_rx failed, so it didn't free the SKB */

		dev_kfree_skb_any(packet->skb);

		packet->skb = NULL;

	}



	/* We need to allocate a new SKB and attach it to the RDB. */

	if (unlikely(ipw2100_alloc_skb(priv, packet))) {

		IPW_DEBUG_WARNING(

			"%s: Unable to allocate SKB onto RBD ring - disabling "

			"adapter.\n", priv->net_dev->name);

		/* TODO: schedule adapter shutdown */

		IPW_DEBUG_INFO("TODO: Shutdown adapter...\n");

	}



	/* Update the RDB entry */

	priv->rx_queue.drv[i].host_addr = packet->dma_addr;

}



#endif



static int ipw2100_corruption_check(struct ipw2100_priv *priv, int i)

{

	struct ipw2100_status *status = &priv->status_queue.drv[i];
@@ -2577,7 +2650,7 @@ static void __ipw2100_rx_process(struct ipw2100_priv *priv) 
		case P8023_DATA_VAL:

#ifdef CONFIG_IPW2100_MONITOR

			if (priv->ieee->iw_mode == IW_MODE_MONITOR) {

				isr_rx(priv, i, &stats);

				isr_rx_monitor(priv, i, &stats);

				break;

			}

#endif
@@ -3882,7 +3955,7 @@ static int ipw2100_switch_mode(struct ipw2100_priv *priv, u32 mode) 
#ifdef CONFIG_IPW2100_MONITOR

	case IW_MODE_MONITOR:

		priv->last_mode = priv->ieee->iw_mode;

		priv->net_dev->type = ARPHRD_IEEE80211;

		priv->net_dev->type = ARPHRD_IEEE80211_RADIOTAP;

		break;

#endif				/* CONFIG_IPW2100_MONITOR */

	}

drivers/net/wireless/ipw2100.h

+4 −0
Original line number Diff line number Diff line
@@ -41,6 +41,10 @@ 


#include <net/ieee80211.h>



#ifdef CONFIG_IPW2100_MONITOR

#include <net/ieee80211_radiotap.h>

#endif



#include <linux/workqueue.h>



struct ipw2100_priv;