| /* |
| * 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: |
| * - IBSS mode simulation (Beacon transmission with competition for "air time") |
| * - IEEE 802.11a and 802.11n modes |
| * - RX filtering based on filter configuration (data->rx_filter) |
| */ |
| |
| #include <net/mac80211.h> |
| #include <net/ieee80211_radiotap.h> |
| #include <linux/if_arp.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/etherdevice.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"); |
| |
| struct hwsim_vif_priv { |
| u32 magic; |
| }; |
| |
| #define HWSIM_VIF_MAGIC 0x69537748 |
| |
| static inline void hwsim_check_magic(struct ieee80211_vif *vif) |
| { |
| struct hwsim_vif_priv *vp = (void *)vif->drv_priv; |
| WARN_ON(vp->magic != HWSIM_VIF_MAGIC); |
| } |
| |
| static inline void hwsim_set_magic(struct ieee80211_vif *vif) |
| { |
| struct hwsim_vif_priv *vp = (void *)vif->drv_priv; |
| vp->magic = HWSIM_VIF_MAGIC; |
| } |
| |
| static inline void hwsim_clear_magic(struct ieee80211_vif *vif) |
| { |
| struct hwsim_vif_priv *vp = (void *)vif->drv_priv; |
| vp->magic = 0; |
| } |
| |
| struct hwsim_sta_priv { |
| u32 magic; |
| }; |
| |
| #define HWSIM_STA_MAGIC 0x6d537748 |
| |
| static inline void hwsim_check_sta_magic(struct ieee80211_sta *sta) |
| { |
| struct hwsim_sta_priv *sp = (void *)sta->drv_priv; |
| WARN_ON(sp->magic != HWSIM_VIF_MAGIC); |
| } |
| |
| static inline void hwsim_set_sta_magic(struct ieee80211_sta *sta) |
| { |
| struct hwsim_sta_priv *sp = (void *)sta->drv_priv; |
| sp->magic = HWSIM_VIF_MAGIC; |
| } |
| |
| static inline void hwsim_clear_sta_magic(struct ieee80211_sta *sta) |
| { |
| struct hwsim_sta_priv *sp = (void *)sta->drv_priv; |
| sp->magic = 0; |
| } |
| |
| 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[] = { |
| { .center_freq = 2412 }, |
| { .center_freq = 2417 }, |
| { .center_freq = 2422 }, |
| { .center_freq = 2427 }, |
| { .center_freq = 2432 }, |
| { .center_freq = 2437 }, |
| { .center_freq = 2442 }, |
| { .center_freq = 2447 }, |
| { .center_freq = 2452 }, |
| { .center_freq = 2457 }, |
| { .center_freq = 2462 }, |
| { .center_freq = 2467 }, |
| { .center_freq = 2472 }, |
| { .center_freq = 2484 }, |
| }; |
| |
| static const struct ieee80211_rate hwsim_rates[] = { |
| { .bitrate = 10 }, |
| { .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE }, |
| { .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE }, |
| { .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE }, |
| { .bitrate = 60 }, |
| { .bitrate = 90 }, |
| { .bitrate = 120 }, |
| { .bitrate = 180 }, |
| { .bitrate = 240 }, |
| { .bitrate = 360 }, |
| { .bitrate = 480 }, |
| { .bitrate = 540 } |
| }; |
| |
| struct mac80211_hwsim_data { |
| struct device *dev; |
| struct ieee80211_supported_band band; |
| struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)]; |
| struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)]; |
| |
| struct ieee80211_channel *channel; |
| int radio_enabled; |
| unsigned long beacon_int; /* in jiffies unit */ |
| unsigned int rx_filter; |
| int started; |
| struct timer_list beacon_timer; |
| }; |
| |
| |
| 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 ieee80211_hw *hw, |
| struct sk_buff *tx_skb) |
| { |
| struct mac80211_hwsim_data *data = hw->priv; |
| struct sk_buff *skb; |
| struct hwsim_radiotap_hdr *hdr; |
| u16 flags; |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb); |
| struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info); |
| |
| 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 = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
| (1 << IEEE80211_RADIOTAP_RATE) | |
| (1 << IEEE80211_RADIOTAP_CHANNEL)); |
| hdr->rt_flags = 0; |
| hdr->rt_rate = txrate->bitrate / 5; |
| hdr->rt_channel = cpu_to_le16(data->channel->center_freq); |
| flags = IEEE80211_CHAN_2GHZ; |
| if (txrate->flags & IEEE80211_RATE_ERP_G) |
| flags |= IEEE80211_CHAN_OFDM; |
| else |
| 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 = htons(ETH_P_802_2); |
| memset(skb->cb, 0, sizeof(skb->cb)); |
| netif_rx(skb); |
| } |
| |
| |
| static int mac80211_hwsim_tx_frame(struct ieee80211_hw *hw, |
| struct sk_buff *skb) |
| { |
| struct mac80211_hwsim_data *data = hw->priv; |
| int i, ack = 0; |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| struct ieee80211_rx_status rx_status; |
| |
| memset(&rx_status, 0, sizeof(rx_status)); |
| /* TODO: set mactime */ |
| rx_status.freq = data->channel->center_freq; |
| rx_status.band = data->channel->band; |
| rx_status.rate_idx = info->tx_rate_idx; |
| /* 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->channel->center_freq != data2->channel->center_freq) |
| continue; |
| |
| nskb = skb_copy(skb, GFP_ATOMIC); |
| if (nskb == NULL) |
| continue; |
| |
| if (memcmp(hdr->addr1, hwsim_radios[i]->wiphy->perm_addr, |
| ETH_ALEN) == 0) |
| ack = 1; |
| ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status); |
| } |
| |
| return ack; |
| } |
| |
| |
| static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb) |
| { |
| struct mac80211_hwsim_data *data = hw->priv; |
| int ack; |
| struct ieee80211_tx_info *txi; |
| |
| mac80211_hwsim_monitor_rx(hw, skb); |
| |
| if (skb->len < 10) { |
| /* Should not happen; just a sanity check for addr1 use */ |
| dev_kfree_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| 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; |
| } |
| |
| ack = mac80211_hwsim_tx_frame(hw, skb); |
| |
| txi = IEEE80211_SKB_CB(skb); |
| |
| hwsim_check_magic(txi->control.vif); |
| if (txi->control.sta) |
| hwsim_check_sta_magic(txi->control.sta); |
| |
| memset(&txi->status, 0, sizeof(txi->status)); |
| if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK)) { |
| if (ack) |
| txi->flags |= IEEE80211_TX_STAT_ACK; |
| else |
| txi->status.excessive_retries = 1; |
| } |
| ieee80211_tx_status_irqsafe(hw, skb); |
| 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) |
| { |
| DECLARE_MAC_BUF(mac); |
| printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n", |
| wiphy_name(hw->wiphy), __func__, conf->type, |
| print_mac(mac, conf->mac_addr)); |
| hwsim_set_magic(conf->vif); |
| return 0; |
| } |
| |
| |
| static void mac80211_hwsim_remove_interface( |
| struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf) |
| { |
| DECLARE_MAC_BUF(mac); |
| printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n", |
| wiphy_name(hw->wiphy), __func__, conf->type, |
| print_mac(mac, conf->mac_addr)); |
| hwsim_check_magic(conf->vif); |
| hwsim_clear_magic(conf->vif); |
| } |
| |
| |
| static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac, |
| struct ieee80211_vif *vif) |
| { |
| struct ieee80211_hw *hw = arg; |
| struct sk_buff *skb; |
| struct ieee80211_tx_info *info; |
| |
| hwsim_check_magic(vif); |
| |
| if (vif->type != NL80211_IFTYPE_AP) |
| return; |
| |
| skb = ieee80211_beacon_get(hw, vif); |
| if (skb == NULL) |
| return; |
| info = IEEE80211_SKB_CB(skb); |
| |
| mac80211_hwsim_monitor_rx(hw, skb); |
| mac80211_hwsim_tx_frame(hw, skb); |
| dev_kfree_skb(skb); |
| } |
| |
| |
| static void mac80211_hwsim_beacon(unsigned long arg) |
| { |
| struct ieee80211_hw *hw = (struct ieee80211_hw *) arg; |
| struct mac80211_hwsim_data *data = hw->priv; |
| |
| if (!data->started || !data->radio_enabled) |
| return; |
| |
| ieee80211_iterate_active_interfaces_atomic( |
| hw, mac80211_hwsim_beacon_tx, hw); |
| |
| data->beacon_timer.expires = jiffies + data->beacon_int; |
| add_timer(&data->beacon_timer); |
| } |
| |
| |
| 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->channel->center_freq, conf->radio_enabled, |
| conf->beacon_int); |
| |
| data->channel = conf->channel; |
| data->radio_enabled = conf->radio_enabled; |
| data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000; |
| if (data->beacon_int < 1) |
| data->beacon_int = 1; |
| |
| if (!data->started || !data->radio_enabled) |
| del_timer(&data->beacon_timer); |
| else |
| mod_timer(&data->beacon_timer, jiffies + data->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 int mac80211_hwsim_config_interface(struct ieee80211_hw *hw, |
| struct ieee80211_vif *vif, |
| struct ieee80211_if_conf *conf) |
| { |
| hwsim_check_magic(vif); |
| return 0; |
| } |
| |
| static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw, |
| struct ieee80211_vif *vif, |
| struct ieee80211_bss_conf *info, |
| u32 changed) |
| { |
| hwsim_check_magic(vif); |
| } |
| |
| static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw, |
| struct ieee80211_vif *vif, |
| enum sta_notify_cmd cmd, |
| struct ieee80211_sta *sta) |
| { |
| hwsim_check_magic(vif); |
| switch (cmd) { |
| case STA_NOTIFY_ADD: |
| hwsim_set_sta_magic(sta); |
| break; |
| case STA_NOTIFY_REMOVE: |
| hwsim_clear_sta_magic(sta); |
| break; |
| } |
| } |
| |
| static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw, |
| struct ieee80211_sta *sta, |
| bool set) |
| { |
| hwsim_check_sta_magic(sta); |
| return 0; |
| } |
| |
| 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, |
| .config_interface = mac80211_hwsim_config_interface, |
| .bss_info_changed = mac80211_hwsim_bss_info_changed, |
| .sta_notify = mac80211_hwsim_sta_notify, |
| .set_tim = mac80211_hwsim_set_tim, |
| }; |
| |
| |
| 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]); |
| 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_drvdata(hwsim_class, NULL, 0, hw, |
| "hwsim%d", i); |
| if (IS_ERR(data->dev)) { |
| printk(KERN_DEBUG |
| "mac80211_hwsim: device_create_drvdata " |
| "failed (%ld)\n", PTR_ERR(data->dev)); |
| err = -ENOMEM; |
| goto failed_drvdata; |
| } |
| data->dev->driver = &mac80211_hwsim_driver; |
| |
| 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 = 4; |
| hw->wiphy->interface_modes = |
| BIT(NL80211_IFTYPE_STATION) | |
| BIT(NL80211_IFTYPE_AP); |
| hw->ampdu_queues = 1; |
| |
| /* ask mac80211 to reserve space for magic */ |
| hw->vif_data_size = sizeof(struct hwsim_vif_priv); |
| hw->sta_data_size = sizeof(struct hwsim_sta_priv); |
| |
| memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels)); |
| memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates)); |
| data->band.channels = data->channels; |
| data->band.n_channels = ARRAY_SIZE(hwsim_channels); |
| data->band.bitrates = data->rates; |
| data->band.n_bitrates = ARRAY_SIZE(hwsim_rates); |
| data->band.ht_info.ht_supported = 1; |
| data->band.ht_info.cap = IEEE80211_HT_CAP_SUP_WIDTH | |
| IEEE80211_HT_CAP_GRN_FLD | |
| IEEE80211_HT_CAP_SGI_40 | |
| IEEE80211_HT_CAP_DSSSCCK40; |
| data->band.ht_info.ampdu_factor = 0x3; |
| data->band.ht_info.ampdu_density = 0x6; |
| memset(data->band.ht_info.supp_mcs_set, 0, |
| sizeof(data->band.ht_info.supp_mcs_set)); |
| data->band.ht_info.supp_mcs_set[0] = 0xff; |
| data->band.ht_info.supp_mcs_set[1] = 0xff; |
| data->band.ht_info.supp_mcs_set[12] = |
| IEEE80211_HT_CAP_MCS_TX_DEFINED; |
| hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band; |
| |
| err = ieee80211_register_hw(hw); |
| if (err < 0) { |
| printk(KERN_DEBUG "mac80211_hwsim: " |
| "ieee80211_register_hw failed (%d)\n", err); |
| goto failed_hw; |
| } |
| |
| printk(KERN_DEBUG "%s: hwaddr %s registered\n", |
| wiphy_name(hw->wiphy), |
| print_mac(mac, hw->wiphy->perm_addr)); |
| |
| setup_timer(&data->beacon_timer, mac80211_hwsim_beacon, |
| (unsigned long) hw); |
| } |
| |
| 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); |
| mac80211_hwsim_free(); |
| return err; |
| |
| failed_hw: |
| device_unregister(data->dev); |
| failed_drvdata: |
| ieee80211_free_hw(hw); |
| hwsim_radios[i] = NULL; |
| 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); |