[PATCH] ipw2100: add radiotap headers to packtes captured in monitor mode
Signed-off-by: Stefan Rompf <stefan@loplof.de>
Signed-off-by: Andrea Merello <andreamrl at tiscali it>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ipw2100.c b/drivers/net/wireless/ipw2100.c
index 84f6387..d429fd5 100644
--- a/drivers/net/wireless/ipw2100.c
+++ b/drivers/net/wireless/ipw2100.c
@@ -2390,15 +2390,6 @@
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 @@
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 @@
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 @@
#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 */
}
diff --git a/drivers/net/wireless/ipw2100.h b/drivers/net/wireless/ipw2100.h
index 948d426..6f0b40f 100644
--- a/drivers/net/wireless/ipw2100.h
+++ b/drivers/net/wireless/ipw2100.h
@@ -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;
