drivers/net/wireless/mac80211_hwsim.c

   1 /*
   2  * mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
   3  * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 /*
  11  * TODO:
  12  * - IBSS mode simulation (Beacon transmission with competition for "air time")
  13  * - IEEE 802.11a and 802.11n modes
  14  * - RX filtering based on filter configuration (data->rx_filter)
  15  */
  16
  17 #include <net/mac80211.h>
  18 #include <net/ieee80211_radiotap.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/etherdevice.h>
  22
  23 MODULE_AUTHOR("Jouni Malinen");
  24 MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
  25 MODULE_LICENSE("GPL");
  26
  27 static int radios = 2;
  28 module_param(radios, int, 0444);
  29 MODULE_PARM_DESC(radios, "Number of simulated radios");
  30
  31 struct hwsim_vif_priv {
  32         u32 magic;
  33 };
  34
  35 #define HWSIM_VIF_MAGIC 0x69537748
  36
  37 static inline void hwsim_check_magic(struct ieee80211_vif *vif)
  38 {
  39         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
  40         WARN_ON(vp->magic != HWSIM_VIF_MAGIC);
  41 }
  42
  43 static inline void hwsim_set_magic(struct ieee80211_vif *vif)
  44 {
  45         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
  46         vp->magic = HWSIM_VIF_MAGIC;
  47 }
  48
  49 static inline void hwsim_clear_magic(struct ieee80211_vif *vif)
  50 {
  51         struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
  52         vp->magic = 0;
  53 }
  54
  55 struct hwsim_sta_priv {
  56         u32 magic;
  57 };
  58
  59 #define HWSIM_STA_MAGIC 0x6d537748
  60
  61 static inline void hwsim_check_sta_magic(struct ieee80211_sta *sta)
  62 {
  63         struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
  64         WARN_ON(sp->magic != HWSIM_VIF_MAGIC);
  65 }
  66
  67 static inline void hwsim_set_sta_magic(struct ieee80211_sta *sta)
  68 {
  69         struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
  70         sp->magic = HWSIM_VIF_MAGIC;
  71 }
  72
  73 static inline void hwsim_clear_sta_magic(struct ieee80211_sta *sta)
  74 {
  75         struct hwsim_sta_priv *sp = (void *)sta->drv_priv;
  76         sp->magic = 0;
  77 }
  78
  79 static struct class *hwsim_class;
  80
  81 static struct ieee80211_hw **hwsim_radios;
  82 static int hwsim_radio_count;
  83 static struct net_device *hwsim_mon; /* global monitor netdev */
  84
  85
  86 static const struct ieee80211_channel hwsim_channels[] = {
  87         { .center_freq = 2412 },
  88         { .center_freq = 2417 },
  89         { .center_freq = 2422 },
  90         { .center_freq = 2427 },
  91         { .center_freq = 2432 },
  92         { .center_freq = 2437 },
  93         { .center_freq = 2442 },
  94         { .center_freq = 2447 },
  95         { .center_freq = 2452 },
  96         { .center_freq = 2457 },
  97         { .center_freq = 2462 },
  98         { .center_freq = 2467 },
  99         { .center_freq = 2472 },
 100         { .center_freq = 2484 },
 101 };
 102
 103 static const struct ieee80211_rate hwsim_rates[] = {
 104         { .bitrate = 10 },
 105         { .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
 106         { .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
 107         { .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
 108         { .bitrate = 60 },
 109         { .bitrate = 90 },
 110         { .bitrate = 120 },
 111         { .bitrate = 180 },
 112         { .bitrate = 240 },
 113         { .bitrate = 360 },
 114         { .bitrate = 480 },
 115         { .bitrate = 540 }
 116 };
 117
 118 struct mac80211_hwsim_data {
 119         struct device *dev;
 120         struct ieee80211_supported_band band;
 121         struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
 122         struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
 123
 124         struct ieee80211_channel *channel;
 125         int radio_enabled;
 126         unsigned long beacon_int; /* in jiffies unit */
 127         unsigned int rx_filter;
 128         int started;
 129         struct timer_list beacon_timer;
 130 };
 131
 132
 133 struct hwsim_radiotap_hdr {
 134         struct ieee80211_radiotap_header hdr;
 135         u8 rt_flags;
 136         u8 rt_rate;
 137         __le16 rt_channel;
 138         __le16 rt_chbitmask;
 139 } __attribute__ ((packed));
 140
 141
 142 static int hwsim_mon_xmit(struct sk_buff *skb, struct net_device *dev)
 143 {
 144         /* TODO: allow packet injection */
 145         dev_kfree_skb(skb);
 146         return 0;
 147 }
 148
 149
 150 static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,
 151                                       struct sk_buff *tx_skb)
 152 {
 153         struct mac80211_hwsim_data *data = hw->priv;
 154         struct sk_buff *skb;
 155         struct hwsim_radiotap_hdr *hdr;
 156         u16 flags;
 157         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_skb);
 158         struct ieee80211_rate *txrate = ieee80211_get_tx_rate(hw, info);
 159
 160         if (!netif_running(hwsim_mon))
 161                 return;
 162
 163         skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
 164         if (skb == NULL)
 165                 return;
 166
 167         hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
 168         hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
 169         hdr->hdr.it_pad = 0;
 170         hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
 171         hdr->hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 172                                           (1 << IEEE80211_RADIOTAP_RATE) |
 173                                           (1 << IEEE80211_RADIOTAP_CHANNEL));
 174         hdr->rt_flags = 0;
 175         hdr->rt_rate = txrate->bitrate / 5;
 176         hdr->rt_channel = cpu_to_le16(data->channel->center_freq);
 177         flags = IEEE80211_CHAN_2GHZ;
 178         if (txrate->flags & IEEE80211_RATE_ERP_G)
 179                 flags |= IEEE80211_CHAN_OFDM;
 180         else
 181                 flags |= IEEE80211_CHAN_CCK;
 182         hdr->rt_chbitmask = cpu_to_le16(flags);
 183
 184         skb->dev = hwsim_mon;
 185         skb_set_mac_header(skb, 0);
 186         skb->ip_summed = CHECKSUM_UNNECESSARY;
 187         skb->pkt_type = PACKET_OTHERHOST;
 188         skb->protocol = htons(ETH_P_802_2);
 189         memset(skb->cb, 0, sizeof(skb->cb));
 190         netif_rx(skb);
 191 }
 192
 193
 194 static int mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
 195                                    struct sk_buff *skb)
 196 {
 197         struct mac80211_hwsim_data *data = hw->priv;
 198         int i, ack = 0;
 199         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 200         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 201         struct ieee80211_rx_status rx_status;
 202
 203         memset(&rx_status, 0, sizeof(rx_status));
 204         /* TODO: set mactime */
 205         rx_status.freq = data->channel->center_freq;
 206         rx_status.band = data->channel->band;
 207         rx_status.rate_idx = info->tx_rate_idx;
 208         /* TODO: simulate signal strength (and optional packet drop) */
 209
 210         /* Copy skb to all enabled radios that are on the current frequency */
 211         for (i = 0; i < hwsim_radio_count; i++) {
 212                 struct mac80211_hwsim_data *data2;
 213                 struct sk_buff *nskb;
 214
 215                 if (hwsim_radios[i] == NULL || hwsim_radios[i] == hw)
 216                         continue;
 217                 data2 = hwsim_radios[i]->priv;
 218                 if (!data2->started || !data2->radio_enabled ||
 219                     data->channel->center_freq != data2->channel->center_freq)
 220                         continue;
 221
 222                 nskb = skb_copy(skb, GFP_ATOMIC);
 223                 if (nskb == NULL)
 224                         continue;
 225
 226                 if (memcmp(hdr->addr1, hwsim_radios[i]->wiphy->perm_addr,
 227                            ETH_ALEN) == 0)
 228                         ack = 1;
 229                 ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status);
 230         }
 231
 232         return ack;
 233 }
 234
 235
 236 static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
 237 {
 238         struct mac80211_hwsim_data *data = hw->priv;
 239         int ack;
 240         struct ieee80211_tx_info *txi;
 241
 242         mac80211_hwsim_monitor_rx(hw, skb);
 243
 244         if (skb->len < 10) {
 245                 /* Should not happen; just a sanity check for addr1 use */
 246                 dev_kfree_skb(skb);
 247                 return NETDEV_TX_OK;
 248         }
 249
 250         if (!data->radio_enabled) {
 251                 printk(KERN_DEBUG "%s: dropped TX frame since radio "
 252                        "disabled\n", wiphy_name(hw->wiphy));
 253                 dev_kfree_skb(skb);
 254                 return NETDEV_TX_OK;
 255         }
 256
 257         ack = mac80211_hwsim_tx_frame(hw, skb);
 258
 259         txi = IEEE80211_SKB_CB(skb);
 260
 261         hwsim_check_magic(txi->control.vif);
 262         if (txi->control.sta)
 263                 hwsim_check_sta_magic(txi->control.sta);
 264
 265         memset(&txi->status, 0, sizeof(txi->status));
 266         if (!(txi->flags & IEEE80211_TX_CTL_NO_ACK)) {
 267                 if (ack)
 268                         txi->flags |= IEEE80211_TX_STAT_ACK;
 269                 else
 270                         txi->status.excessive_retries = 1;
 271         }
 272         ieee80211_tx_status_irqsafe(hw, skb);
 273         return NETDEV_TX_OK;
 274 }
 275
 276
 277 static int mac80211_hwsim_start(struct ieee80211_hw *hw)
 278 {
 279         struct mac80211_hwsim_data *data = hw->priv;
 280         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
 281         data->started = 1;
 282         return 0;
 283 }
 284
 285
 286 static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
 287 {
 288         struct mac80211_hwsim_data *data = hw->priv;
 289         data->started = 0;
 290         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
 291 }
 292
 293
 294 static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
 295                                         struct ieee80211_if_init_conf *conf)
 296 {
 297         DECLARE_MAC_BUF(mac);
 298         printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
 299                wiphy_name(hw->wiphy), __func__, conf->type,
 300                print_mac(mac, conf->mac_addr));
 301         hwsim_set_magic(conf->vif);
 302         return 0;
 303 }
 304
 305
 306 static void mac80211_hwsim_remove_interface(
 307         struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
 308 {
 309         DECLARE_MAC_BUF(mac);
 310         printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
 311                wiphy_name(hw->wiphy), __func__, conf->type,
 312                print_mac(mac, conf->mac_addr));
 313         hwsim_check_magic(conf->vif);
 314         hwsim_clear_magic(conf->vif);
 315 }
 316
 317
 318 static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
 319                                      struct ieee80211_vif *vif)
 320 {
 321         struct ieee80211_hw *hw = arg;
 322         struct sk_buff *skb;
 323         struct ieee80211_tx_info *info;
 324
 325         hwsim_check_magic(vif);
 326
 327         if (vif->type != NL80211_IFTYPE_AP)
 328                 return;
 329
 330         skb = ieee80211_beacon_get(hw, vif);
 331         if (skb == NULL)
 332                 return;
 333         info = IEEE80211_SKB_CB(skb);
 334
 335         mac80211_hwsim_monitor_rx(hw, skb);
 336         mac80211_hwsim_tx_frame(hw, skb);
 337         dev_kfree_skb(skb);
 338 }
 339
 340
 341 static void mac80211_hwsim_beacon(unsigned long arg)
 342 {
 343         struct ieee80211_hw *hw = (struct ieee80211_hw *) arg;
 344         struct mac80211_hwsim_data *data = hw->priv;
 345
 346         if (!data->started || !data->radio_enabled)
 347                 return;
 348
 349         ieee80211_iterate_active_interfaces_atomic(
 350                 hw, mac80211_hwsim_beacon_tx, hw);
 351
 352         data->beacon_timer.expires = jiffies + data->beacon_int;
 353         add_timer(&data->beacon_timer);
 354 }
 355
 356
 357 static int mac80211_hwsim_config(struct ieee80211_hw *hw,
 358                                  struct ieee80211_conf *conf)
 359 {
 360         struct mac80211_hwsim_data *data = hw->priv;
 361
 362         printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
 363                wiphy_name(hw->wiphy), __func__,
 364                conf->channel->center_freq, conf->radio_enabled,
 365                conf->beacon_int);
 366
 367         data->channel = conf->channel;
 368         data->radio_enabled = conf->radio_enabled;
 369         data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
 370         if (data->beacon_int < 1)
 371                 data->beacon_int = 1;
 372
 373         if (!data->started || !data->radio_enabled)
 374                 del_timer(&data->beacon_timer);
 375         else
 376                 mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
 377
 378         return 0;
 379 }
 380
 381
 382 static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
 383                                             unsigned int changed_flags,
 384                                             unsigned int *total_flags,
 385                                             int mc_count,
 386                                             struct dev_addr_list *mc_list)
 387 {
 388         struct mac80211_hwsim_data *data = hw->priv;
 389
 390         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
 391
 392         data->rx_filter = 0;
 393         if (*total_flags & FIF_PROMISC_IN_BSS)
 394                 data->rx_filter |= FIF_PROMISC_IN_BSS;
 395         if (*total_flags & FIF_ALLMULTI)
 396                 data->rx_filter |= FIF_ALLMULTI;
 397
 398         *total_flags = data->rx_filter;
 399 }
 400
 401 static int mac80211_hwsim_config_interface(struct ieee80211_hw *hw,
 402                                            struct ieee80211_vif *vif,
 403                                            struct ieee80211_if_conf *conf)
 404 {
 405         hwsim_check_magic(vif);
 406         return 0;
 407 }
 408
 409 static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
 410                                             struct ieee80211_vif *vif,
 411                                             struct ieee80211_bss_conf *info,
 412                                             u32 changed)
 413 {
 414         hwsim_check_magic(vif);
 415 }
 416
 417 static void mac80211_hwsim_sta_notify(struct ieee80211_hw *hw,
 418                                       struct ieee80211_vif *vif,
 419                                       enum sta_notify_cmd cmd,
 420                                       struct ieee80211_sta *sta)
 421 {
 422         hwsim_check_magic(vif);
 423         switch (cmd) {
 424         case STA_NOTIFY_ADD:
 425                 hwsim_set_sta_magic(sta);
 426                 break;
 427         case STA_NOTIFY_REMOVE:
 428                 hwsim_clear_sta_magic(sta);
 429                 break;
 430         }
 431 }
 432
 433 static int mac80211_hwsim_set_tim(struct ieee80211_hw *hw,
 434                                   struct ieee80211_sta *sta,
 435                                   bool set)
 436 {
 437         hwsim_check_sta_magic(sta);
 438         return 0;
 439 }
 440
 441 static const struct ieee80211_ops mac80211_hwsim_ops =
 442 {
 443         .tx = mac80211_hwsim_tx,
 444         .start = mac80211_hwsim_start,
 445         .stop = mac80211_hwsim_stop,
 446         .add_interface = mac80211_hwsim_add_interface,
 447         .remove_interface = mac80211_hwsim_remove_interface,
 448         .config = mac80211_hwsim_config,
 449         .configure_filter = mac80211_hwsim_configure_filter,
 450         .config_interface = mac80211_hwsim_config_interface,
 451         .bss_info_changed = mac80211_hwsim_bss_info_changed,
 452         .sta_notify = mac80211_hwsim_sta_notify,
 453         .set_tim = mac80211_hwsim_set_tim,
 454 };
 455
 456
 457 static void mac80211_hwsim_free(void)
 458 {
 459         int i;
 460
 461         for (i = 0; i < hwsim_radio_count; i++) {
 462                 if (hwsim_radios[i]) {
 463                         struct mac80211_hwsim_data *data;
 464                         data = hwsim_radios[i]->priv;
 465                         ieee80211_unregister_hw(hwsim_radios[i]);
 466                         device_unregister(data->dev);
 467                         ieee80211_free_hw(hwsim_radios[i]);
 468                 }
 469         }
 470         kfree(hwsim_radios);
 471         class_destroy(hwsim_class);
 472 }
 473
 474
 475 static struct device_driver mac80211_hwsim_driver = {
 476         .name = "mac80211_hwsim"
 477 };
 478
 479
 480 static void hwsim_mon_setup(struct net_device *dev)
 481 {
 482         dev->hard_start_xmit = hwsim_mon_xmit;
 483         dev->destructor = free_netdev;
 484         ether_setup(dev);
 485         dev->tx_queue_len = 0;
 486         dev->type = ARPHRD_IEEE80211_RADIOTAP;
 487         memset(dev->dev_addr, 0, ETH_ALEN);
 488         dev->dev_addr[0] = 0x12;
 489 }
 490
 491
 492 static int __init init_mac80211_hwsim(void)
 493 {
 494         int i, err = 0;
 495         u8 addr[ETH_ALEN];
 496         struct mac80211_hwsim_data *data;
 497         struct ieee80211_hw *hw;
 498         DECLARE_MAC_BUF(mac);
 499
 500         if (radios < 1 || radios > 65535)
 501                 return -EINVAL;
 502
 503         hwsim_radio_count = radios;
 504         hwsim_radios = kcalloc(hwsim_radio_count,
 505                                sizeof(struct ieee80211_hw *), GFP_KERNEL);
 506         if (hwsim_radios == NULL)
 507                 return -ENOMEM;
 508
 509         hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
 510         if (IS_ERR(hwsim_class)) {
 511                 kfree(hwsim_radios);
 512                 return PTR_ERR(hwsim_class);
 513         }
 514
 515         memset(addr, 0, ETH_ALEN);
 516         addr[0] = 0x02;
 517
 518         for (i = 0; i < hwsim_radio_count; i++) {
 519                 printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
 520                        i);
 521                 hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
 522                 if (hw == NULL) {
 523                         printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
 524                                "failed\n");
 525                         err = -ENOMEM;
 526                         goto failed;
 527                 }
 528                 hwsim_radios[i] = hw;
 529
 530                 data = hw->priv;
 531                 data->dev = device_create_drvdata(hwsim_class, NULL, 0, hw,
 532                                                 "hwsim%d", i);
 533                 if (IS_ERR(data->dev)) {
 534                         printk(KERN_DEBUG
 535                                "mac80211_hwsim: device_create_drvdata "
 536                                "failed (%ld)\n", PTR_ERR(data->dev));
 537                         err = -ENOMEM;
 538                         goto failed_drvdata;
 539                 }
 540                 data->dev->driver = &mac80211_hwsim_driver;
 541
 542                 SET_IEEE80211_DEV(hw, data->dev);
 543                 addr[3] = i >> 8;
 544                 addr[4] = i;
 545                 SET_IEEE80211_PERM_ADDR(hw, addr);
 546
 547                 hw->channel_change_time = 1;
 548                 hw->queues = 4;
 549                 hw->wiphy->interface_modes =
 550                         BIT(NL80211_IFTYPE_STATION) |
 551                         BIT(NL80211_IFTYPE_AP);
 552                 hw->ampdu_queues = 1;
 553
 554                 /* ask mac80211 to reserve space for magic */
 555                 hw->vif_data_size = sizeof(struct hwsim_vif_priv);
 556                 hw->sta_data_size = sizeof(struct hwsim_sta_priv);
 557
 558                 memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
 559                 memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
 560                 data->band.channels = data->channels;
 561                 data->band.n_channels = ARRAY_SIZE(hwsim_channels);
 562                 data->band.bitrates = data->rates;
 563                 data->band.n_bitrates = ARRAY_SIZE(hwsim_rates);
 564                 data->band.ht_info.ht_supported = 1;
 565                 data->band.ht_info.cap = IEEE80211_HT_CAP_SUP_WIDTH |
 566                         IEEE80211_HT_CAP_GRN_FLD |
 567                         IEEE80211_HT_CAP_SGI_40 |
 568                         IEEE80211_HT_CAP_DSSSCCK40;
 569                 data->band.ht_info.ampdu_factor = 0x3;
 570                 data->band.ht_info.ampdu_density = 0x6;
 571                 memset(data->band.ht_info.supp_mcs_set, 0,
 572                        sizeof(data->band.ht_info.supp_mcs_set));
 573                 data->band.ht_info.supp_mcs_set[0] = 0xff;
 574                 data->band.ht_info.supp_mcs_set[1] = 0xff;
 575                 data->band.ht_info.supp_mcs_set[12] =
 576                         IEEE80211_HT_CAP_MCS_TX_DEFINED;
 577                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &data->band;
 578
 579                 err = ieee80211_register_hw(hw);
 580                 if (err < 0) {
 581                         printk(KERN_DEBUG "mac80211_hwsim: "
 582                                "ieee80211_register_hw failed (%d)\n", err);
 583                         goto failed_hw;
 584                 }
 585
 586                 printk(KERN_DEBUG "%s: hwaddr %s registered\n",
 587                        wiphy_name(hw->wiphy),
 588                        print_mac(mac, hw->wiphy->perm_addr));
 589
 590                 setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
 591                             (unsigned long) hw);
 592         }
 593
 594         hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
 595         if (hwsim_mon == NULL)
 596                 goto failed;
 597
 598         rtnl_lock();
 599
 600         err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
 601         if (err < 0)
 602                 goto failed_mon;
 603
 604
 605         err = register_netdevice(hwsim_mon);
 606         if (err < 0)
 607                 goto failed_mon;
 608
 609         rtnl_unlock();
 610
 611         return 0;
 612
 613 failed_mon:
 614         rtnl_unlock();
 615         free_netdev(hwsim_mon);
 616         mac80211_hwsim_free();
 617         return err;
 618
 619 failed_hw:
 620         device_unregister(data->dev);
 621 failed_drvdata:
 622         ieee80211_free_hw(hw);
 623         hwsim_radios[i] = NULL;
 624 failed:
 625         mac80211_hwsim_free();
 626         return err;
 627 }
 628
 629
 630 static void __exit exit_mac80211_hwsim(void)
 631 {
 632         printk(KERN_DEBUG "mac80211_hwsim: unregister %d radios\n",
 633                hwsim_radio_count);
 634
 635         unregister_netdev(hwsim_mon);
 636         mac80211_hwsim_free();
 637 }
 638
 639
 640 module_init(init_mac80211_hwsim);
 641 module_exit(exit_mac80211_hwsim);