hostap/mac80211_hwsim/mac80211_hwsim.c

444 lines
12 KiB
C

/*
* mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/*
* TODO:
* - periodic Beacon transmission in AP mode
* - IBSS mode simulation (Beacon transmission with competion for "air time")
* - IEEE 802.11a and 802.11n modes
*/
#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");
MODULE_LICENSE("GPL");
static int radios = 2;
module_param(radios, int, 0444);
MODULE_PARM_DESC(radios, "Number of simulated radios");
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[] = {
{ .chan = 1, .freq = 2412, .val = 1 },
{ .chan = 2, .freq = 2417, .val = 2 },
{ .chan = 3, .freq = 2422, .val = 3 },
{ .chan = 4, .freq = 2427, .val = 4 },
{ .chan = 5, .freq = 2432, .val = 5 },
{ .chan = 6, .freq = 2437, .val = 6 },
{ .chan = 7, .freq = 2442, .val = 7 },
{ .chan = 8, .freq = 2447, .val = 8 },
{ .chan = 9, .freq = 2452, .val = 9 },
{ .chan = 10, .freq = 2457, .val = 10 },
{ .chan = 11, .freq = 2462, .val = 11 },
{ .chan = 12, .freq = 2467, .val = 12 },
{ .chan = 13, .freq = 2472, .val = 13 },
{ .chan = 14, .freq = 2484, .val = 14 },
};
static const struct ieee80211_rate hwsim_rates[] = {
{ .rate = 10, .val = 10, .flags = IEEE80211_RATE_CCK },
{ .rate = 20, .val = 20, .val2 = 21, .flags = IEEE80211_RATE_CCK_2 },
{ .rate = 55, .val = 55, .val2 = 56, .flags = IEEE80211_RATE_CCK_2 },
{ .rate = 110, .val = 110, .val2 = 111,
.flags = IEEE80211_RATE_CCK_2 },
{ .rate = 60, .val = 60, .flags = IEEE80211_RATE_OFDM },
{ .rate = 90, .val = 90, .flags = IEEE80211_RATE_OFDM },
{ .rate = 120, .val = 120, .flags = IEEE80211_RATE_OFDM },
{ .rate = 180, .val = 180, .flags = IEEE80211_RATE_OFDM },
{ .rate = 240, .val = 240, .flags = IEEE80211_RATE_OFDM },
{ .rate = 360, .val = 360, .flags = IEEE80211_RATE_OFDM },
{ .rate = 480, .val = 480, .flags = IEEE80211_RATE_OFDM },
{ .rate = 540, .val = 540, .flags = IEEE80211_RATE_OFDM }
};
struct mac80211_hwsim_data {
struct device *dev;
struct ieee80211_hw_mode modes[1];
struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
int freq;
int channel;
enum ieee80211_phymode phymode;
int radio_enabled;
int beacon_int;
unsigned int rx_filter;
int started;
};
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)
{
struct mac80211_hwsim_data *data = hw->priv;
struct ieee80211_tx_status tx_status;
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));
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
memset(&rx_status, 0, sizeof(rx_status));
/* TODO: set mactime */
rx_status.freq = data->freq;
rx_status.channel = data->channel;
rx_status.phymode = data->phymode;
rx_status.rate = control->tx_rate;
/* TODO: simulate signal strength (and optional packet drop) */
/* Copy skb to all enabled radios that are on the current frequency */
for (i = 0; i < hwsim_radio_count; i++) {
struct mac80211_hwsim_data *data2;
struct sk_buff *nskb;
if (hwsim_radios[i] == NULL || hwsim_radios[i] == hw)
continue;
data2 = hwsim_radios[i]->priv;
if (!data2->started || !data2->radio_enabled ||
data->freq != data2->freq)
continue;
nskb = skb_copy(skb, GFP_ATOMIC);
if (nskb == NULL)
continue;
ieee80211_rx(hwsim_radios[i], nskb, &rx_status);
}
memset(&tx_status, 0, sizeof(tx_status));
memcpy(&tx_status.control, control, sizeof(*control));
/* TODO: proper ACK determination */
tx_status.flags = IEEE80211_TX_STATUS_ACK;
ieee80211_tx_status(hw, skb, &tx_status);
return NETDEV_TX_OK;
}
static int mac80211_hwsim_start(struct ieee80211_hw *hw)
{
struct mac80211_hwsim_data *data = hw->priv;
printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
data->started = 1;
return 0;
}
static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
{
struct mac80211_hwsim_data *data = hw->priv;
data->started = 0;
printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
}
static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
struct ieee80211_if_init_conf *conf)
{
printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
return 0;
}
static void mac80211_hwsim_remove_interface(
struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
{
printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
}
static int mac80211_hwsim_config(struct ieee80211_hw *hw,
struct ieee80211_conf *conf)
{
struct mac80211_hwsim_data *data = hw->priv;
printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
wiphy_name(hw->wiphy), __func__,
conf->freq, conf->radio_enabled, conf->beacon_int);
data->freq = conf->freq;
data->channel = conf->channel;
data->phymode = conf->phymode;
data->radio_enabled = conf->radio_enabled;
data->beacon_int = conf->beacon_int;
return 0;
}
static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
unsigned int changed_flags,
unsigned int *total_flags,
int mc_count,
struct dev_addr_list *mc_list)
{
struct mac80211_hwsim_data *data = hw->priv;
printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
data->rx_filter = 0;
if (*total_flags & FIF_PROMISC_IN_BSS)
data->rx_filter |= FIF_PROMISC_IN_BSS;
if (*total_flags & FIF_ALLMULTI)
data->rx_filter |= FIF_ALLMULTI;
*total_flags = data->rx_filter;
}
static const struct ieee80211_ops mac80211_hwsim_ops =
{
.tx = mac80211_hwsim_tx,
.start = mac80211_hwsim_start,
.stop = mac80211_hwsim_stop,
.add_interface = mac80211_hwsim_add_interface,
.remove_interface = mac80211_hwsim_remove_interface,
.config = mac80211_hwsim_config,
.configure_filter = mac80211_hwsim_configure_filter,
};
static void mac80211_hwsim_free(void)
{
int i;
for (i = 0; i < hwsim_radio_count; i++) {
if (hwsim_radios[i]) {
struct mac80211_hwsim_data *data;
data = hwsim_radios[i]->priv;
ieee80211_unregister_hw(hwsim_radios[i]);
if (!IS_ERR(data->dev))
device_unregister(data->dev);
ieee80211_free_hw(hwsim_radios[i]);
}
}
kfree(hwsim_radios);
class_destroy(hwsim_class);
}
static struct device_driver mac80211_hwsim_driver = {
.name = "mac80211_hwsim"
};
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;
u8 addr[ETH_ALEN];
struct mac80211_hwsim_data *data;
struct ieee80211_hw *hw;
DECLARE_MAC_BUF(mac);
if (radios < 1 || radios > 65535)
return -EINVAL;
hwsim_radio_count = radios;
hwsim_radios = kcalloc(hwsim_radio_count,
sizeof(struct ieee80211_hw *), GFP_KERNEL);
if (hwsim_radios == NULL)
return -ENOMEM;
hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
if (IS_ERR(hwsim_class)) {
kfree(hwsim_radios);
return PTR_ERR(hwsim_class);
}
memset(addr, 0, ETH_ALEN);
addr[0] = 0x02;
for (i = 0; i < hwsim_radio_count; i++) {
printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
i);
hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
if (hw == NULL) {
printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
"failed\n");
err = -ENOMEM;
goto failed;
}
hwsim_radios[i] = hw;
data = hw->priv;
data->dev = device_create(hwsim_class, NULL, 0, "hwsim%d", i);
if (IS_ERR(data->dev)) {
printk(KERN_DEBUG "mac80211_hwsim: device_create "
"failed (%ld)\n", PTR_ERR(data->dev));
err = -ENOMEM;
goto failed;
}
data->dev->driver = &mac80211_hwsim_driver;
dev_set_drvdata(data->dev, hw);
SET_IEEE80211_DEV(hw, data->dev);
addr[3] = i >> 8;
addr[4] = i;
SET_IEEE80211_PERM_ADDR(hw, addr);
hw->channel_change_time = 1;
hw->queues = 1;
memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
data->modes[0].channels = data->channels;
data->modes[0].rates = data->rates;
data->modes[0].mode = MODE_IEEE80211G;
data->modes[0].num_channels = ARRAY_SIZE(hwsim_channels);
data->modes[0].num_rates = ARRAY_SIZE(hwsim_rates);
err = ieee80211_register_hwmode(hw, data->modes);
if (err < 0) {
printk(KERN_DEBUG "mac80211_hwsim: "
"ieee80211_register_hwmode failed (%d)\n", err);
goto failed;
}
err = ieee80211_register_hw(hw);
if (err < 0) {
printk(KERN_DEBUG "mac80211_hwsim: "
"ieee80211_register_hw failed (%d)\n", err);
goto failed;
}
printk(KERN_DEBUG "%s: hwaddr %s registered\n",
wiphy_name(hw->wiphy),
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;
}
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();
}
module_init(init_mac80211_hwsim);
module_exit(exit_mac80211_hwsim);