diff options
Diffstat (limited to 'mac80211_hwsim')
| -rw-r--r-- | mac80211_hwsim/mac80211_hwsim.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/mac80211_hwsim/mac80211_hwsim.c b/mac80211_hwsim/mac80211_hwsim.c index bccb2f4..4421f79 100644 --- a/mac80211_hwsim/mac80211_hwsim.c +++ b/mac80211_hwsim/mac80211_hwsim.c @@ -15,6 +15,9 @@ */ #include <net/mac80211.h> +#include <net/ieee80211_radiotap.h> +#include <linux/if_arp.h> +#include <linux/rtnetlink.h> MODULE_AUTHOR("Jouni Malinen"); MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211"); @@ -29,6 +32,7 @@ static struct class *hwsim_class; static struct ieee80211_hw **hwsim_radios; static int hwsim_radio_count; +static struct net_device *hwsim_mon; /* global monitor netdev */ static const struct ieee80211_channel hwsim_channels[] = { @@ -79,6 +83,66 @@ struct mac80211_hwsim_data { }; +struct hwsim_radiotap_hdr { + struct ieee80211_radiotap_header hdr; + u8 rt_flags; + u8 rt_rate; + __le16 rt_channel; + __le16 rt_chbitmask; +} __attribute__ ((packed)); + + +static int hwsim_mon_xmit(struct sk_buff *skb, struct net_device *dev) +{ + /* TODO: allow packet injection */ + dev_kfree_skb(skb); + return 0; +} + + +static void mac80211_hwsim_monitor_rx(struct mac80211_hwsim_data *data, + struct sk_buff *tx_skb, + struct ieee80211_tx_control *control) +{ + struct sk_buff *skb; + struct hwsim_radiotap_hdr *hdr; + u16 flags; + + if (!netif_running(hwsim_mon)) + return; + + skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC); + if (skb == NULL) + return; + + hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr)); + hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION; + hdr->hdr.it_pad = 0; + hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr)); + hdr->hdr.it_present = __constant_cpu_to_le32( + (1 << IEEE80211_RADIOTAP_FLAGS) | + (1 << IEEE80211_RADIOTAP_RATE) | + (1 << IEEE80211_RADIOTAP_CHANNEL)); + hdr->rt_flags = 0; + hdr->rt_rate = control->tx_rate / 5; + hdr->rt_channel = data->freq; + flags = IEEE80211_CHAN_2GHZ; + if (control->rate->flags & IEEE80211_RATE_OFDM) + flags |= IEEE80211_CHAN_OFDM; + if (control->rate->flags & IEEE80211_RATE_CCK) + flags |= IEEE80211_CHAN_CCK; + hdr->rt_chbitmask = cpu_to_le16(flags); + + skb->dev = hwsim_mon; + skb_set_mac_header(skb, 0); + skb->ip_summed = CHECKSUM_UNNECESSARY; + skb->pkt_type = PACKET_OTHERHOST; + skb->protocol = __constant_htons(ETH_P_802_2); + memset(skb->cb, 0, sizeof(skb->cb)); + netif_rx(skb); +} + + static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb, struct ieee80211_tx_control *control) { @@ -87,6 +151,8 @@ static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb, struct ieee80211_rx_status rx_status; int i; + mac80211_hwsim_monitor_rx(data, skb, control); + if (!data->radio_enabled) { printk(KERN_DEBUG "%s: dropped TX frame since radio " "disabled\n", wiphy_name(hw->wiphy)); @@ -233,6 +299,18 @@ static struct device_driver mac80211_hwsim_driver = { }; +static void hwsim_mon_setup(struct net_device *dev) +{ + dev->hard_start_xmit = hwsim_mon_xmit; + dev->destructor = free_netdev; + ether_setup(dev); + dev->tx_queue_len = 0; + dev->type = ARPHRD_IEEE80211_RADIOTAP; + memset(dev->dev_addr, 0, ETH_ALEN); + dev->dev_addr[0] = 0x12; +} + + static int __init init_mac80211_hwsim(void) { int i, err = 0; @@ -317,8 +395,29 @@ static int __init init_mac80211_hwsim(void) print_mac(mac, hw->wiphy->perm_addr)); } + hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup); + if (hwsim_mon == NULL) + goto failed; + + rtnl_lock(); + + err = dev_alloc_name(hwsim_mon, hwsim_mon->name); + if (err < 0) { + goto failed_mon; + } + + err = register_netdevice(hwsim_mon); + if (err < 0) + goto failed_mon; + + rtnl_unlock(); + return 0; +failed_mon: + rtnl_unlock(); + free_netdev(hwsim_mon); + failed: mac80211_hwsim_free(); return err; @@ -330,6 +429,7 @@ static void __exit exit_mac80211_hwsim(void) printk(KERN_DEBUG "mac80211_hwsim: unregister %d radios\n", hwsim_radio_count); + unregister_netdev(hwsim_mon); mac80211_hwsim_free(); } |