From 15745a7dd1ac6bf1ef7959040f864c78a95aa35b Mon Sep 17 00:00:00 2001 From: Stefan Rompf Date: Tue, 21 Feb 2006 18:36:17 +0800 Subject: [PATCH] [PATCH] ipw2100: add radiotap headers to packtes captured in monitor mode Signed-off-by: Stefan Rompf Signed-off-by: Andrea Merello Signed-off-by: Zhu Yi Signed-off-by: John W. Linville --- drivers/net/wireless/ipw2100.c | 95 ++++++++++++++++++++++++++++++---- drivers/net/wireless/ipw2100.h | 4 ++ 2 files changed, 88 insertions(+), 11 deletions(-) diff --git a/drivers/net/wireless/ipw2100.c b/drivers/net/wireless/ipw2100.c index 84f63876bf..d429fd576a 100644 --- a/drivers/net/wireless/ipw2100.c +++ b/drivers/net/wireless/ipw2100.c @@ -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 */ } diff --git a/drivers/net/wireless/ipw2100.h b/drivers/net/wireless/ipw2100.h index 948d426fcf..6f0b40f96a 100644 --- a/drivers/net/wireless/ipw2100.h +++ b/drivers/net/wireless/ipw2100.h @@ -41,6 +41,10 @@ #include +#ifdef CONFIG_IPW2100_MONITOR +#include +#endif + #include struct ipw2100_priv; -- 2.39.5