git.maemo.org Git - wpasupplicant/blob - mac80211_hwsim/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  */
  15
  16 #include <net/mac80211.h>
  17 #include <net/ieee80211_radiotap.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/etherdevice.h>
  21
  22 MODULE_AUTHOR("Jouni Malinen");
  23 MODULE_DESCRIPTION("Software simulator of 802.11 radio(s) for mac80211");
  24 MODULE_LICENSE("GPL");
  25
  26 static int radios = 2;
  27 module_param(radios, int, 0444);
  28 MODULE_PARM_DESC(radios, "Number of simulated radios");
  29
  30
  31 static struct class *hwsim_class;
  32
  33 static struct ieee80211_hw **hwsim_radios;
  34 static int hwsim_radio_count;
  35 static struct net_device *hwsim_mon; /* global monitor netdev */
  36
  37
  38 static const struct ieee80211_channel hwsim_channels[] = {
  39         { .chan = 1, .freq = 2412, .val = 1 },
  40         { .chan = 2, .freq = 2417, .val = 2 },
  41         { .chan = 3, .freq = 2422, .val = 3 },
  42         { .chan = 4, .freq = 2427, .val = 4 },
  43         { .chan = 5, .freq = 2432, .val = 5 },
  44         { .chan = 6, .freq = 2437, .val = 6 },
  45         { .chan = 7, .freq = 2442, .val = 7 },
  46         { .chan = 8, .freq = 2447, .val = 8 },
  47         { .chan = 9, .freq = 2452, .val = 9 },
  48         { .chan = 10, .freq = 2457, .val = 10 },
  49         { .chan = 11, .freq = 2462, .val = 11 },
  50         { .chan = 12, .freq = 2467, .val = 12 },
  51         { .chan = 13, .freq = 2472, .val = 13 },
  52         { .chan = 14, .freq = 2484, .val = 14 },
  53 };
  54
  55 static const struct ieee80211_rate hwsim_rates[] = {
  56         { .rate = 10, .val = 10, .flags = IEEE80211_RATE_CCK },
  57         { .rate = 20, .val = 20, .val2 = 21, .flags = IEEE80211_RATE_CCK_2 },
  58         { .rate = 55, .val = 55, .val2 = 56, .flags = IEEE80211_RATE_CCK_2 },
  59         { .rate = 110, .val = 110, .val2 = 111,
  60           .flags = IEEE80211_RATE_CCK_2 },
  61         { .rate = 60, .val = 60, .flags = IEEE80211_RATE_OFDM },
  62         { .rate = 90, .val = 90, .flags = IEEE80211_RATE_OFDM },
  63         { .rate = 120, .val = 120, .flags = IEEE80211_RATE_OFDM },
  64         { .rate = 180, .val = 180, .flags = IEEE80211_RATE_OFDM },
  65         { .rate = 240, .val = 240, .flags = IEEE80211_RATE_OFDM },
  66         { .rate = 360, .val = 360, .flags = IEEE80211_RATE_OFDM },
  67         { .rate = 480, .val = 480, .flags = IEEE80211_RATE_OFDM },
  68         { .rate = 540, .val = 540, .flags = IEEE80211_RATE_OFDM }
  69 };
  70
  71 struct mac80211_hwsim_data {
  72         struct device *dev;
  73         struct ieee80211_hw_mode modes[1];
  74         struct ieee80211_channel channels[ARRAY_SIZE(hwsim_channels)];
  75         struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
  76
  77         int freq;
  78         int channel;
  79         enum ieee80211_phymode phymode;
  80         int radio_enabled;
  81         unsigned long beacon_int; /* in jiffies unit */
  82         unsigned int rx_filter;
  83         int started;
  84         struct timer_list beacon_timer;
  85 };
  86
  87
  88 struct hwsim_radiotap_hdr {
  89         struct ieee80211_radiotap_header hdr;
  90         u8 rt_flags;
  91         u8 rt_rate;
  92         __le16 rt_channel;
  93         __le16 rt_chbitmask;
  94 } __attribute__ ((packed));
  95
  96
  97 static int hwsim_mon_xmit(struct sk_buff *skb, struct net_device *dev)
  98 {
  99         /* TODO: allow packet injection */
 100         dev_kfree_skb(skb);
 101         return 0;
 102 }
 103
 104
 105 static void mac80211_hwsim_monitor_rx(struct mac80211_hwsim_data *data,
 106                                       struct sk_buff *tx_skb,
 107                                       struct ieee80211_tx_control *control)
 108 {
 109         struct sk_buff *skb;
 110         struct hwsim_radiotap_hdr *hdr;
 111         u16 flags;
 112
 113         if (!netif_running(hwsim_mon))
 114                 return;
 115
 116         skb = skb_copy_expand(tx_skb, sizeof(*hdr), 0, GFP_ATOMIC);
 117         if (skb == NULL)
 118                 return;
 119
 120         hdr = (struct hwsim_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
 121         hdr->hdr.it_version = PKTHDR_RADIOTAP_VERSION;
 122         hdr->hdr.it_pad = 0;
 123         hdr->hdr.it_len = cpu_to_le16(sizeof(*hdr));
 124         hdr->hdr.it_present = __constant_cpu_to_le32(
 125              (1 << IEEE80211_RADIOTAP_FLAGS) |
 126              (1 << IEEE80211_RADIOTAP_RATE) |
 127              (1 << IEEE80211_RADIOTAP_CHANNEL));
 128         hdr->rt_flags = 0;
 129         hdr->rt_rate = control->tx_rate / 5;
 130         hdr->rt_channel = data->freq;
 131         flags = IEEE80211_CHAN_2GHZ;
 132         if (control->rate->flags & IEEE80211_RATE_OFDM)
 133                 flags |= IEEE80211_CHAN_OFDM;
 134         if (control->rate->flags & IEEE80211_RATE_CCK)
 135                 flags |= IEEE80211_CHAN_CCK;
 136         hdr->rt_chbitmask = cpu_to_le16(flags);
 137
 138         skb->dev = hwsim_mon;
 139         skb_set_mac_header(skb, 0);
 140         skb->ip_summed = CHECKSUM_UNNECESSARY;
 141         skb->pkt_type = PACKET_OTHERHOST;
 142         skb->protocol = __constant_htons(ETH_P_802_2);
 143         memset(skb->cb, 0, sizeof(skb->cb));
 144         netif_rx(skb);
 145 }
 146
 147
 148 static int mac80211_hwsim_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
 149                              struct ieee80211_tx_control *control)
 150 {
 151         struct mac80211_hwsim_data *data = hw->priv;
 152         struct ieee80211_tx_status tx_status;
 153         struct ieee80211_rx_status rx_status;
 154         int i, ack = 0;
 155         struct ieee80211_hdr *hdr;
 156
 157         mac80211_hwsim_monitor_rx(data, skb, control);
 158
 159         if (skb->len < 10) {
 160                 /* Should not happen; just a sanity check for addr1 use */
 161                 dev_kfree_skb(skb);
 162                 return NETDEV_TX_OK;
 163         }
 164
 165         if (!data->radio_enabled) {
 166                 printk(KERN_DEBUG "%s: dropped TX frame since radio "
 167                        "disabled\n", wiphy_name(hw->wiphy));
 168                 dev_kfree_skb(skb);
 169                 return NETDEV_TX_OK;
 170         }
 171
 172         hdr = (struct ieee80211_hdr *) skb->data;
 173         if (is_multicast_ether_addr(hdr->addr1))
 174                 ack = 1;
 175
 176         memset(&rx_status, 0, sizeof(rx_status));
 177         /* TODO: set mactime */
 178         rx_status.freq = data->freq;
 179         rx_status.channel = data->channel;
 180         rx_status.phymode = data->phymode;
 181         rx_status.rate = control->tx_rate;
 182         /* TODO: simulate signal strength (and optional packet drop) */
 183
 184         /* Copy skb to all enabled radios that are on the current frequency */
 185         for (i = 0; i < hwsim_radio_count; i++) {
 186                 struct mac80211_hwsim_data *data2;
 187                 struct sk_buff *nskb;
 188
 189                 if (hwsim_radios[i] == NULL || hwsim_radios[i] == hw)
 190                         continue;
 191                 data2 = hwsim_radios[i]->priv;
 192                 if (!data2->started || !data2->radio_enabled ||
 193                     data->freq != data2->freq)
 194                         continue;
 195
 196                 nskb = skb_copy(skb, GFP_ATOMIC);
 197                 if (nskb == NULL)
 198                         continue;
 199
 200                 if (memcmp(hdr->addr1, hwsim_radios[i]->wiphy->perm_addr,
 201                            ETH_ALEN) == 0)
 202                         ack = 1;
 203                 ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status);
 204         }
 205
 206         memset(&tx_status, 0, sizeof(tx_status));
 207         memcpy(&tx_status.control, control, sizeof(*control));
 208         tx_status.flags = ack ? IEEE80211_TX_STATUS_ACK : 0;
 209         ieee80211_tx_status_irqsafe(hw, skb, &tx_status);
 210         return NETDEV_TX_OK;
 211 }
 212
 213
 214 static int mac80211_hwsim_start(struct ieee80211_hw *hw)
 215 {
 216         struct mac80211_hwsim_data *data = hw->priv;
 217         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
 218         data->started = 1;
 219         return 0;
 220 }
 221
 222
 223 static void mac80211_hwsim_stop(struct ieee80211_hw *hw)
 224 {
 225         struct mac80211_hwsim_data *data = hw->priv;
 226         data->started = 0;
 227         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
 228 }
 229
 230
 231 static int mac80211_hwsim_add_interface(struct ieee80211_hw *hw,
 232                                         struct ieee80211_if_init_conf *conf)
 233 {
 234         DECLARE_MAC_BUF(mac);
 235         printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
 236                wiphy_name(hw->wiphy), __func__, conf->type,
 237                print_mac(mac, conf->mac_addr));
 238         return 0;
 239 }
 240
 241
 242 static void mac80211_hwsim_remove_interface(
 243         struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf)
 244 {
 245         DECLARE_MAC_BUF(mac);
 246         printk(KERN_DEBUG "%s:%s (type=%d mac_addr=%s)\n",
 247                wiphy_name(hw->wiphy), __func__, conf->type,
 248                print_mac(mac, conf->mac_addr));
 249 }
 250
 251
 252 static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac,
 253                                      struct ieee80211_vif *vif)
 254 {
 255         struct ieee80211_hw *hw = arg;
 256         struct mac80211_hwsim_data *data = hw->priv;
 257         struct ieee80211_tx_control control;
 258         struct sk_buff *skb;
 259         struct ieee80211_rx_status rx_status;
 260         int i;
 261
 262         if (vif->type != IEEE80211_IF_TYPE_AP)
 263                 return;
 264
 265         skb = ieee80211_beacon_get(hw, vif, &control);
 266         if (skb == NULL)
 267                 return;
 268
 269         mac80211_hwsim_monitor_rx(data, skb, &control);
 270
 271         memset(&rx_status, 0, sizeof(rx_status));
 272         /* TODO: set mactime */
 273         rx_status.freq = data->freq;
 274         rx_status.channel = data->channel;
 275         rx_status.phymode = data->phymode;
 276         rx_status.rate = control.tx_rate;
 277         /* TODO: simulate signal strength (and optional packet drop) */
 278
 279         /* Copy skb to all enabled radios that are on the current frequency */
 280         for (i = 0; i < hwsim_radio_count; i++) {
 281                 struct mac80211_hwsim_data *data2;
 282                 struct sk_buff *nskb;
 283
 284                 if (hwsim_radios[i] == NULL || hwsim_radios[i] == hw)
 285                         continue;
 286                 data2 = hwsim_radios[i]->priv;
 287                 if (!data2->started || !data2->radio_enabled ||
 288                     data->freq != data2->freq)
 289                         continue;
 290
 291                 nskb = skb_copy(skb, GFP_ATOMIC);
 292                 if (nskb == NULL)
 293                         continue;
 294
 295                 ieee80211_rx_irqsafe(hwsim_radios[i], nskb, &rx_status);
 296         }
 297
 298         dev_kfree_skb(skb);
 299 }
 300
 301
 302 static void mac80211_hwsim_beacon(unsigned long arg)
 303 {
 304         struct ieee80211_hw *hw = (struct ieee80211_hw *) arg;
 305         struct mac80211_hwsim_data *data = hw->priv;
 306
 307         if (!data->started || !data->radio_enabled)
 308                 return;
 309
 310         ieee80211_iterate_active_interfaces(hw, mac80211_hwsim_beacon_tx, hw);
 311
 312         data->beacon_timer.expires = jiffies + data->beacon_int;
 313         add_timer(&data->beacon_timer);
 314 }
 315
 316
 317 static int mac80211_hwsim_config(struct ieee80211_hw *hw,
 318                                  struct ieee80211_conf *conf)
 319 {
 320         struct mac80211_hwsim_data *data = hw->priv;
 321
 322         printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
 323                wiphy_name(hw->wiphy), __func__,
 324                conf->freq, conf->radio_enabled, conf->beacon_int);
 325
 326         data->freq = conf->freq;
 327         data->channel = conf->channel;
 328         data->phymode = conf->phymode;
 329         data->radio_enabled = conf->radio_enabled;
 330         data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
 331         if (data->beacon_int < 1)
 332                 data->beacon_int = 1;
 333
 334         if (!data->started || !data->radio_enabled)
 335                 del_timer(&data->beacon_timer);
 336         else
 337                 mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
 338
 339         return 0;
 340 }
 341
 342
 343 static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
 344                                             unsigned int changed_flags,
 345                                             unsigned int *total_flags,
 346                                             int mc_count,
 347                                             struct dev_addr_list *mc_list)
 348 {
 349         struct mac80211_hwsim_data *data = hw->priv;
 350
 351         printk(KERN_DEBUG "%s:%s\n", wiphy_name(hw->wiphy), __func__);
 352
 353         data->rx_filter = 0;
 354         if (*total_flags & FIF_PROMISC_IN_BSS)
 355                 data->rx_filter |= FIF_PROMISC_IN_BSS;
 356         if (*total_flags & FIF_ALLMULTI)
 357                 data->rx_filter |= FIF_ALLMULTI;
 358
 359         *total_flags = data->rx_filter;
 360 }
 361
 362
 363
 364 static const struct ieee80211_ops mac80211_hwsim_ops =
 365 {
 366         .tx = mac80211_hwsim_tx,
 367         .start = mac80211_hwsim_start,
 368         .stop = mac80211_hwsim_stop,
 369         .add_interface = mac80211_hwsim_add_interface,
 370         .remove_interface = mac80211_hwsim_remove_interface,
 371         .config = mac80211_hwsim_config,
 372         .configure_filter = mac80211_hwsim_configure_filter,
 373 };
 374
 375
 376 static void mac80211_hwsim_free(void)
 377 {
 378         int i;
 379
 380         for (i = 0; i < hwsim_radio_count; i++) {
 381                 if (hwsim_radios[i]) {
 382                         struct mac80211_hwsim_data *data;
 383                         data = hwsim_radios[i]->priv;
 384                         ieee80211_unregister_hw(hwsim_radios[i]);
 385                         if (!IS_ERR(data->dev))
 386                                 device_unregister(data->dev);
 387                         ieee80211_free_hw(hwsim_radios[i]);
 388                 }
 389         }
 390         kfree(hwsim_radios);
 391         class_destroy(hwsim_class);
 392 }
 393
 394
 395 static struct device_driver mac80211_hwsim_driver = {
 396         .name = "mac80211_hwsim"
 397 };
 398
 399
 400 static void hwsim_mon_setup(struct net_device *dev)
 401 {
 402         dev->hard_start_xmit = hwsim_mon_xmit;
 403         dev->destructor = free_netdev;
 404         ether_setup(dev);
 405         dev->tx_queue_len = 0;
 406         dev->type = ARPHRD_IEEE80211_RADIOTAP;
 407         memset(dev->dev_addr, 0, ETH_ALEN);
 408         dev->dev_addr[0] = 0x12;
 409 }
 410
 411
 412 static int __init init_mac80211_hwsim(void)
 413 {
 414         int i, err = 0;
 415         u8 addr[ETH_ALEN];
 416         struct mac80211_hwsim_data *data;
 417         struct ieee80211_hw *hw;
 418         DECLARE_MAC_BUF(mac);
 419
 420         if (radios < 1 || radios > 65535)
 421                 return -EINVAL;
 422
 423         hwsim_radio_count = radios;
 424         hwsim_radios = kcalloc(hwsim_radio_count,
 425                                sizeof(struct ieee80211_hw *), GFP_KERNEL);
 426         if (hwsim_radios == NULL)
 427                 return -ENOMEM;
 428
 429         hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
 430         if (IS_ERR(hwsim_class)) {
 431                 kfree(hwsim_radios);
 432                 return PTR_ERR(hwsim_class);
 433         }
 434
 435         memset(addr, 0, ETH_ALEN);
 436         addr[0] = 0x02;
 437
 438         for (i = 0; i < hwsim_radio_count; i++) {
 439                 printk(KERN_DEBUG "mac80211_hwsim: Initializing radio %d\n",
 440                        i);
 441                 hw = ieee80211_alloc_hw(sizeof(*data), &mac80211_hwsim_ops);
 442                 if (hw == NULL) {
 443                         printk(KERN_DEBUG "mac80211_hwsim: ieee80211_alloc_hw "
 444                                "failed\n");
 445                         err = -ENOMEM;
 446                         goto failed;
 447                 }
 448                 hwsim_radios[i] = hw;
 449
 450                 data = hw->priv;
 451                 data->dev = device_create(hwsim_class, NULL, 0, "hwsim%d", i);
 452                 if (IS_ERR(data->dev)) {
 453                         printk(KERN_DEBUG "mac80211_hwsim: device_create "
 454                                "failed (%ld)\n", PTR_ERR(data->dev));
 455                         err = -ENOMEM;
 456                         goto failed;
 457                 }
 458                 data->dev->driver = &mac80211_hwsim_driver;
 459                 dev_set_drvdata(data->dev, hw);
 460
 461                 SET_IEEE80211_DEV(hw, data->dev);
 462                 addr[3] = i >> 8;
 463                 addr[4] = i;
 464                 SET_IEEE80211_PERM_ADDR(hw, addr);
 465
 466                 hw->channel_change_time = 1;
 467                 hw->queues = 1;
 468
 469                 memcpy(data->channels, hwsim_channels, sizeof(hwsim_channels));
 470                 memcpy(data->rates, hwsim_rates, sizeof(hwsim_rates));
 471                 data->modes[0].channels = data->channels;
 472                 data->modes[0].rates = data->rates;
 473                 data->modes[0].mode = MODE_IEEE80211G;
 474                 data->modes[0].num_channels = ARRAY_SIZE(hwsim_channels);
 475                 data->modes[0].num_rates = ARRAY_SIZE(hwsim_rates);
 476
 477                 err = ieee80211_register_hwmode(hw, data->modes);
 478                 if (err < 0) {
 479                         printk(KERN_DEBUG "mac80211_hwsim: "
 480                                "ieee80211_register_hwmode failed (%d)\n", err);
 481                         goto failed;
 482                 }
 483
 484                 err = ieee80211_register_hw(hw);
 485                 if (err < 0) {
 486                         printk(KERN_DEBUG "mac80211_hwsim: "
 487                                "ieee80211_register_hw failed (%d)\n", err);
 488                         goto failed;
 489                 }
 490
 491                 printk(KERN_DEBUG "%s: hwaddr %s registered\n",
 492                        wiphy_name(hw->wiphy),
 493                        print_mac(mac, hw->wiphy->perm_addr));
 494
 495                 setup_timer(&data->beacon_timer, mac80211_hwsim_beacon,
 496                             (unsigned long) hw);
 497         }
 498
 499         hwsim_mon = alloc_netdev(0, "hwsim%d", hwsim_mon_setup);
 500         if (hwsim_mon == NULL)
 501                 goto failed;
 502
 503         rtnl_lock();
 504
 505         err = dev_alloc_name(hwsim_mon, hwsim_mon->name);
 506         if (err < 0) {
 507                 goto failed_mon;
 508         }
 509
 510         err = register_netdevice(hwsim_mon);
 511         if (err < 0)
 512                 goto failed_mon;
 513
 514         rtnl_unlock();
 515
 516         return 0;
 517
 518 failed_mon:
 519         rtnl_unlock();
 520         free_netdev(hwsim_mon);
 521
 522 failed:
 523         mac80211_hwsim_free();
 524         return err;
 525 }
 526
 527
 528 static void __exit exit_mac80211_hwsim(void)
 529 {
 530         printk(KERN_DEBUG "mac80211_hwsim: unregister %d radios\n",
 531                hwsim_radio_count);
 532
 533         unregister_netdev(hwsim_mon);
 534         mac80211_hwsim_free();
 535 }
 536
 537
 538 module_init(init_mac80211_hwsim);
 539 module_exit(exit_mac80211_hwsim);