net/mac80211/ieee80211.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <net/cfg80211.h>
  25
  26 #include "ieee80211_common.h"
  27 #include "ieee80211_i.h"
  28 #include "ieee80211_rate.h"
  29 #include "wep.h"
  30 #include "wme.h"
  31 #include "aes_ccm.h"
  32 #include "ieee80211_led.h"
  33 #include "ieee80211_cfg.h"
  34 #include "debugfs.h"
  35 #include "debugfs_netdev.h"
  36
  37 /*
  38  * For seeing transmitted packets on monitor interfaces
  39  * we have a radiotap header too.
  40  */
  41 struct ieee80211_tx_status_rtap_hdr {
  42         struct ieee80211_radiotap_header hdr;
  43         __le16 tx_flags;
  44         u8 data_retries;
  45 } __attribute__ ((packed));
  46
  47 /* common interface routines */
  48
  49 static struct net_device_stats *ieee80211_get_stats(struct net_device *dev)
  50 {
  51         struct ieee80211_sub_if_data *sdata;
  52         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  53         return &(sdata->stats);
  54 }
  55
  56 static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
  57 {
  58         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  59         return ETH_ALEN;
  60 }
  61
  62 /* master interface */
  63
  64 static int ieee80211_master_open(struct net_device *dev)
  65 {
  66         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  67         struct ieee80211_sub_if_data *sdata;
  68         int res = -EOPNOTSUPP;
  69
  70         read_lock(&local->sub_if_lock);
  71         list_for_each_entry(sdata, &local->sub_if_list, list) {
  72                 if (sdata->dev != dev && netif_running(sdata->dev)) {
  73                         res = 0;
  74                         break;
  75                 }
  76         }
  77         read_unlock(&local->sub_if_lock);
  78         return res;
  79 }
  80
  81 static int ieee80211_master_stop(struct net_device *dev)
  82 {
  83         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  84         struct ieee80211_sub_if_data *sdata;
  85
  86         read_lock(&local->sub_if_lock);
  87         list_for_each_entry(sdata, &local->sub_if_list, list)
  88                 if (sdata->dev != dev && netif_running(sdata->dev))
  89                         dev_close(sdata->dev);
  90         read_unlock(&local->sub_if_lock);
  91
  92         return 0;
  93 }
  94
  95 /* management interface */
  96
  97 static void
  98 ieee80211_fill_frame_info(struct ieee80211_local *local,
  99                           struct ieee80211_frame_info *fi,
 100                           struct ieee80211_rx_status *status)
 101 {
 102         if (status) {
 103                 struct timespec ts;
 104                 struct ieee80211_rate *rate;
 105
 106                 jiffies_to_timespec(jiffies, &ts);
 107                 fi->hosttime = cpu_to_be64((u64) ts.tv_sec * 1000000 +
 108                                            ts.tv_nsec / 1000);
 109                 fi->mactime = cpu_to_be64(status->mactime);
 110                 switch (status->phymode) {
 111                 case MODE_IEEE80211A:
 112                         fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a);
 113                         break;
 114                 case MODE_IEEE80211B:
 115                         fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b);
 116                         break;
 117                 case MODE_IEEE80211G:
 118                         fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g);
 119                         break;
 120                 case MODE_ATHEROS_TURBO:
 121                         fi->phytype =
 122                                 htonl(ieee80211_phytype_dsss_dot11_turbo);
 123                         break;
 124                 default:
 125                         fi->phytype = htonl(0xAAAAAAAA);
 126                         break;
 127                 }
 128                 fi->channel = htonl(status->channel);
 129                 rate = ieee80211_get_rate(local, status->phymode,
 130                                           status->rate);
 131                 if (rate) {
 132                         fi->datarate = htonl(rate->rate);
 133                         if (rate->flags & IEEE80211_RATE_PREAMBLE2) {
 134                                 if (status->rate == rate->val)
 135                                         fi->preamble = htonl(2); /* long */
 136                                 else if (status->rate == rate->val2)
 137                                         fi->preamble = htonl(1); /* short */
 138                         } else
 139                                 fi->preamble = htonl(0);
 140                 } else {
 141                         fi->datarate = htonl(0);
 142                         fi->preamble = htonl(0);
 143                 }
 144
 145                 fi->antenna = htonl(status->antenna);
 146                 fi->priority = htonl(0xffffffff); /* no clue */
 147                 fi->ssi_type = htonl(ieee80211_ssi_raw);
 148                 fi->ssi_signal = htonl(status->ssi);
 149                 fi->ssi_noise = 0x00000000;
 150                 fi->encoding = 0;
 151         } else {
 152                 /* clear everything because we really don't know.
 153                  * the msg_type field isn't present on monitor frames
 154                  * so we don't know whether it will be present or not,
 155                  * but it's ok to not clear it since it'll be assigned
 156                  * anyway */
 157                 memset(fi, 0, sizeof(*fi) - sizeof(fi->msg_type));
 158
 159                 fi->ssi_type = htonl(ieee80211_ssi_none);
 160         }
 161         fi->version = htonl(IEEE80211_FI_VERSION);
 162         fi->length = cpu_to_be32(sizeof(*fi) - sizeof(fi->msg_type));
 163 }
 164
 165 /* this routine is actually not just for this, but also
 166  * for pushing fake 'management' frames into userspace.
 167  * it shall be replaced by a netlink-based system. */
 168 void
 169 ieee80211_rx_mgmt(struct ieee80211_local *local, struct sk_buff *skb,
 170                   struct ieee80211_rx_status *status, u32 msg_type)
 171 {
 172         struct ieee80211_frame_info *fi;
 173         const size_t hlen = sizeof(struct ieee80211_frame_info);
 174         struct ieee80211_sub_if_data *sdata;
 175
 176         skb->dev = local->apdev;
 177
 178         sdata = IEEE80211_DEV_TO_SUB_IF(local->apdev);
 179
 180         if (skb_headroom(skb) < hlen) {
 181                 I802_DEBUG_INC(local->rx_expand_skb_head);
 182                 if (pskb_expand_head(skb, hlen, 0, GFP_ATOMIC)) {
 183                         dev_kfree_skb(skb);
 184                         return;
 185                 }
 186         }
 187
 188         fi = (struct ieee80211_frame_info *) skb_push(skb, hlen);
 189
 190         ieee80211_fill_frame_info(local, fi, status);
 191         fi->msg_type = htonl(msg_type);
 192
 193         sdata->stats.rx_packets++;
 194         sdata->stats.rx_bytes += skb->len;
 195
 196         skb_set_mac_header(skb, 0);
 197         skb->ip_summed = CHECKSUM_UNNECESSARY;
 198         skb->pkt_type = PACKET_OTHERHOST;
 199         skb->protocol = htons(ETH_P_802_2);
 200         memset(skb->cb, 0, sizeof(skb->cb));
 201         netif_rx(skb);
 202 }
 203
 204 void ieee80211_key_threshold_notify(struct net_device *dev,
 205                                     struct ieee80211_key *key,
 206                                     struct sta_info *sta)
 207 {
 208         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 209         struct sk_buff *skb;
 210         struct ieee80211_msg_key_notification *msg;
 211
 212         /* if no one will get it anyway, don't even allocate it.
 213          * unlikely because this is only relevant for APs
 214          * where the device must be open... */
 215         if (unlikely(!local->apdev))
 216                 return;
 217
 218         skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
 219                             sizeof(struct ieee80211_msg_key_notification));
 220         if (!skb)
 221                 return;
 222
 223         skb_reserve(skb, sizeof(struct ieee80211_frame_info));
 224         msg = (struct ieee80211_msg_key_notification *)
 225                 skb_put(skb, sizeof(struct ieee80211_msg_key_notification));
 226         msg->tx_rx_count = key->tx_rx_count;
 227         memcpy(msg->ifname, dev->name, IFNAMSIZ);
 228         if (sta)
 229                 memcpy(msg->addr, sta->addr, ETH_ALEN);
 230         else
 231                 memset(msg->addr, 0xff, ETH_ALEN);
 232
 233         key->tx_rx_count = 0;
 234
 235         ieee80211_rx_mgmt(local, skb, NULL,
 236                           ieee80211_msg_key_threshold_notification);
 237 }
 238
 239 static int ieee80211_mgmt_open(struct net_device *dev)
 240 {
 241         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 242
 243         if (!netif_running(local->mdev))
 244                 return -EOPNOTSUPP;
 245         return 0;
 246 }
 247
 248 static int ieee80211_mgmt_stop(struct net_device *dev)
 249 {
 250         return 0;
 251 }
 252
 253 static int ieee80211_change_mtu_apdev(struct net_device *dev, int new_mtu)
 254 {
 255         /* FIX: what would be proper limits for MTU?
 256          * This interface uses 802.11 frames. */
 257         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) {
 258                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 259                        dev->name, new_mtu);
 260                 return -EINVAL;
 261         }
 262
 263 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 264         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 265 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 266         dev->mtu = new_mtu;
 267         return 0;
 268 }
 269
 270 void ieee80211_if_mgmt_setup(struct net_device *dev)
 271 {
 272         ether_setup(dev);
 273         dev->hard_start_xmit = ieee80211_mgmt_start_xmit;
 274         dev->change_mtu = ieee80211_change_mtu_apdev;
 275         dev->get_stats = ieee80211_get_stats;
 276         dev->open = ieee80211_mgmt_open;
 277         dev->stop = ieee80211_mgmt_stop;
 278         dev->type = ARPHRD_IEEE80211_PRISM;
 279         dev->hard_header_parse = header_parse_80211;
 280         dev->uninit = ieee80211_if_reinit;
 281         dev->destructor = ieee80211_if_free;
 282 }
 283
 284 /* regular interfaces */
 285
 286 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 287 {
 288         /* FIX: what would be proper limits for MTU?
 289          * This interface uses 802.3 frames. */
 290         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
 291                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 292                        dev->name, new_mtu);
 293                 return -EINVAL;
 294         }
 295
 296 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 297         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 298 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 299         dev->mtu = new_mtu;
 300         return 0;
 301 }
 302
 303 static inline int identical_mac_addr_allowed(int type1, int type2)
 304 {
 305         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 306                 type2 == IEEE80211_IF_TYPE_MNTR ||
 307                 (type1 == IEEE80211_IF_TYPE_AP &&
 308                  type2 == IEEE80211_IF_TYPE_WDS) ||
 309                 (type1 == IEEE80211_IF_TYPE_WDS &&
 310                  (type2 == IEEE80211_IF_TYPE_WDS ||
 311                   type2 == IEEE80211_IF_TYPE_AP)) ||
 312                 (type1 == IEEE80211_IF_TYPE_AP &&
 313                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 314                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 315                  (type2 == IEEE80211_IF_TYPE_AP ||
 316                   type2 == IEEE80211_IF_TYPE_VLAN)));
 317 }
 318
 319 /* Check if running monitor interfaces should go to a "soft monitor" mode
 320  * and switch them if necessary. */
 321 static inline void ieee80211_start_soft_monitor(struct ieee80211_local *local)
 322 {
 323         struct ieee80211_if_init_conf conf;
 324
 325         if (local->open_count && local->open_count == local->monitors &&
 326             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) &&
 327             local->ops->remove_interface) {
 328                 conf.if_id = -1;
 329                 conf.type = IEEE80211_IF_TYPE_MNTR;
 330                 conf.mac_addr = NULL;
 331                 local->ops->remove_interface(local_to_hw(local), &conf);
 332         }
 333 }
 334
 335 /* Check if running monitor interfaces should go to a "hard monitor" mode
 336  * and switch them if necessary. */
 337 static void ieee80211_start_hard_monitor(struct ieee80211_local *local)
 338 {
 339         struct ieee80211_if_init_conf conf;
 340
 341         if (local->open_count && local->open_count == local->monitors &&
 342             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
 343                 conf.if_id = -1;
 344                 conf.type = IEEE80211_IF_TYPE_MNTR;
 345                 conf.mac_addr = NULL;
 346                 local->ops->add_interface(local_to_hw(local), &conf);
 347         }
 348 }
 349
 350 static void ieee80211_if_open(struct net_device *dev)
 351 {
 352         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 353
 354         switch (sdata->type) {
 355         case IEEE80211_IF_TYPE_STA:
 356         case IEEE80211_IF_TYPE_IBSS:
 357                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 358                 break;
 359         }
 360 }
 361
 362 static int ieee80211_open(struct net_device *dev)
 363 {
 364         struct ieee80211_sub_if_data *sdata, *nsdata;
 365         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 366         struct ieee80211_if_init_conf conf;
 367         int res;
 368
 369         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 370         read_lock(&local->sub_if_lock);
 371         list_for_each_entry(nsdata, &local->sub_if_list, list) {
 372                 struct net_device *ndev = nsdata->dev;
 373
 374                 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
 375                     compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0 &&
 376                     !identical_mac_addr_allowed(sdata->type, nsdata->type)) {
 377                         read_unlock(&local->sub_if_lock);
 378                         return -ENOTUNIQ;
 379                 }
 380         }
 381         read_unlock(&local->sub_if_lock);
 382
 383         if (sdata->type == IEEE80211_IF_TYPE_WDS &&
 384             is_zero_ether_addr(sdata->u.wds.remote_addr))
 385                 return -ENOLINK;
 386
 387         if (sdata->type == IEEE80211_IF_TYPE_MNTR && local->open_count &&
 388             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
 389                 /* run the interface in a "soft monitor" mode */
 390                 local->monitors++;
 391                 local->open_count++;
 392                 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 393                 return 0;
 394         }
 395         ieee80211_if_open(dev);
 396         ieee80211_start_soft_monitor(local);
 397
 398         conf.if_id = dev->ifindex;
 399         conf.type = sdata->type;
 400         if (sdata->type == IEEE80211_IF_TYPE_MNTR)
 401                 conf.mac_addr = NULL;
 402         else
 403                 conf.mac_addr = dev->dev_addr;
 404         res = local->ops->add_interface(local_to_hw(local), &conf);
 405         if (res) {
 406                 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
 407                         ieee80211_start_hard_monitor(local);
 408                 return res;
 409         }
 410
 411         if (local->open_count == 0) {
 412                 res = 0;
 413                 tasklet_enable(&local->tx_pending_tasklet);
 414                 tasklet_enable(&local->tasklet);
 415                 if (local->ops->open)
 416                         res = local->ops->open(local_to_hw(local));
 417                 if (res == 0) {
 418                         res = dev_open(local->mdev);
 419                         if (res) {
 420                                 if (local->ops->stop)
 421                                         local->ops->stop(local_to_hw(local));
 422                         } else {
 423                                 res = ieee80211_hw_config(local);
 424                                 if (res && local->ops->stop)
 425                                         local->ops->stop(local_to_hw(local));
 426                                 else if (!res && local->apdev)
 427                                         dev_open(local->apdev);
 428                         }
 429                 }
 430                 if (res) {
 431                         if (local->ops->remove_interface)
 432                                 local->ops->remove_interface(local_to_hw(local),
 433                                                             &conf);
 434                         return res;
 435                 }
 436         }
 437         local->open_count++;
 438
 439         if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
 440                 local->monitors++;
 441                 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 442         } else {
 443                 ieee80211_if_config(dev);
 444                 ieee80211_reset_erp_info(dev);
 445         }
 446
 447         if (sdata->type == IEEE80211_IF_TYPE_STA &&
 448             !local->user_space_mlme)
 449                 netif_carrier_off(dev);
 450         else
 451                 netif_carrier_on(dev);
 452
 453         netif_start_queue(dev);
 454         return 0;
 455 }
 456
 457 static void ieee80211_if_shutdown(struct net_device *dev)
 458 {
 459         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 460         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 461
 462         ASSERT_RTNL();
 463         switch (sdata->type) {
 464         case IEEE80211_IF_TYPE_STA:
 465         case IEEE80211_IF_TYPE_IBSS:
 466                 sdata->u.sta.state = IEEE80211_DISABLED;
 467                 del_timer_sync(&sdata->u.sta.timer);
 468                 /*
 469                  * Holding the sub_if_lock for writing here blocks
 470                  * out the receive path and makes sure it's not
 471                  * currently processing a packet that may get
 472                  * added to the queue.
 473                  */
 474                 write_lock_bh(&local->sub_if_lock);
 475                 skb_queue_purge(&sdata->u.sta.skb_queue);
 476                 write_unlock_bh(&local->sub_if_lock);
 477
 478                 if (!local->ops->hw_scan &&
 479                     local->scan_dev == sdata->dev) {
 480                         local->sta_scanning = 0;
 481                         cancel_delayed_work(&local->scan_work);
 482                 }
 483                 flush_workqueue(local->hw.workqueue);
 484                 break;
 485         }
 486 }
 487
 488 static int ieee80211_stop(struct net_device *dev)
 489 {
 490         struct ieee80211_sub_if_data *sdata;
 491         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 492
 493         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 494
 495         if (sdata->type == IEEE80211_IF_TYPE_MNTR &&
 496             local->open_count > 1 &&
 497             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
 498                 /* remove "soft monitor" interface */
 499                 local->open_count--;
 500                 local->monitors--;
 501                 if (!local->monitors)
 502                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 503                 return 0;
 504         }
 505
 506         netif_stop_queue(dev);
 507         ieee80211_if_shutdown(dev);
 508
 509         if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
 510                 local->monitors--;
 511                 if (!local->monitors)
 512                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 513         }
 514
 515         local->open_count--;
 516         if (local->open_count == 0) {
 517                 if (netif_running(local->mdev))
 518                         dev_close(local->mdev);
 519                 if (local->apdev)
 520                         dev_close(local->apdev);
 521                 if (local->ops->stop)
 522                         local->ops->stop(local_to_hw(local));
 523                 tasklet_disable(&local->tx_pending_tasklet);
 524                 tasklet_disable(&local->tasklet);
 525         }
 526         if (local->ops->remove_interface) {
 527                 struct ieee80211_if_init_conf conf;
 528
 529                 conf.if_id = dev->ifindex;
 530                 conf.type = sdata->type;
 531                 conf.mac_addr = dev->dev_addr;
 532                 local->ops->remove_interface(local_to_hw(local), &conf);
 533         }
 534
 535         ieee80211_start_hard_monitor(local);
 536
 537         return 0;
 538 }
 539
 540 enum netif_tx_lock_class {
 541         TX_LOCK_NORMAL,
 542         TX_LOCK_MASTER,
 543 };
 544
 545 static inline void netif_tx_lock_nested(struct net_device *dev, int subclass)
 546 {
 547         spin_lock_nested(&dev->_xmit_lock, subclass);
 548         dev->xmit_lock_owner = smp_processor_id();
 549 }
 550
 551 static void ieee80211_set_multicast_list(struct net_device *dev)
 552 {
 553         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 554         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 555         unsigned short flags;
 556
 557         netif_tx_lock_nested(local->mdev, TX_LOCK_MASTER);
 558         if (((dev->flags & IFF_ALLMULTI) != 0) ^
 559             ((sdata->flags & IEEE80211_SDATA_ALLMULTI) != 0)) {
 560                 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 561                         local->iff_allmultis--;
 562                 else
 563                         local->iff_allmultis++;
 564                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 565         }
 566         if (((dev->flags & IFF_PROMISC) != 0) ^
 567             ((sdata->flags & IEEE80211_SDATA_PROMISC) != 0)) {
 568                 if (sdata->flags & IEEE80211_SDATA_PROMISC)
 569                         local->iff_promiscs--;
 570                 else
 571                         local->iff_promiscs++;
 572                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 573         }
 574         if (dev->mc_count != sdata->mc_count) {
 575                 local->mc_count = local->mc_count - sdata->mc_count +
 576                                   dev->mc_count;
 577                 sdata->mc_count = dev->mc_count;
 578         }
 579         if (local->ops->set_multicast_list) {
 580                 flags = local->mdev->flags;
 581                 if (local->iff_allmultis)
 582                         flags |= IFF_ALLMULTI;
 583                 if (local->iff_promiscs)
 584                         flags |= IFF_PROMISC;
 585                 read_lock(&local->sub_if_lock);
 586                 local->ops->set_multicast_list(local_to_hw(local), flags,
 587                                               local->mc_count);
 588                 read_unlock(&local->sub_if_lock);
 589         }
 590         netif_tx_unlock(local->mdev);
 591 }
 592
 593 /* Must not be called for mdev and apdev */
 594 void ieee80211_if_setup(struct net_device *dev)
 595 {
 596         ether_setup(dev);
 597         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 598         dev->wireless_handlers = &ieee80211_iw_handler_def;
 599         dev->set_multicast_list = ieee80211_set_multicast_list;
 600         dev->change_mtu = ieee80211_change_mtu;
 601         dev->get_stats = ieee80211_get_stats;
 602         dev->open = ieee80211_open;
 603         dev->stop = ieee80211_stop;
 604         dev->uninit = ieee80211_if_reinit;
 605         dev->destructor = ieee80211_if_free;
 606 }
 607
 608 /* WDS specialties */
 609
 610 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 611 {
 612         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 613         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 614         struct sta_info *sta;
 615
 616         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
 617                 return 0;
 618
 619         /* Create STA entry for the new peer */
 620         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
 621         if (!sta)
 622                 return -ENOMEM;
 623         sta_info_put(sta);
 624
 625         /* Remove STA entry for the old peer */
 626         sta = sta_info_get(local, sdata->u.wds.remote_addr);
 627         if (sta) {
 628                 sta_info_free(sta);
 629                 sta_info_put(sta);
 630         } else {
 631                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
 632                        "peer " MAC_FMT "\n",
 633                        dev->name, MAC_ARG(sdata->u.wds.remote_addr));
 634         }
 635
 636         /* Update WDS link data */
 637         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
 638
 639         return 0;
 640 }
 641
 642 /* everything else */
 643
 644 static int __ieee80211_if_config(struct net_device *dev,
 645                                  struct sk_buff *beacon,
 646                                  struct ieee80211_tx_control *control)
 647 {
 648         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 649         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 650         struct ieee80211_if_conf conf;
 651         static u8 scan_bssid[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 652
 653         if (!local->ops->config_interface || !netif_running(dev))
 654                 return 0;
 655
 656         memset(&conf, 0, sizeof(conf));
 657         conf.type = sdata->type;
 658         if (sdata->type == IEEE80211_IF_TYPE_STA ||
 659             sdata->type == IEEE80211_IF_TYPE_IBSS) {
 660                 if (local->sta_scanning &&
 661                     local->scan_dev == dev)
 662                         conf.bssid = scan_bssid;
 663                 else
 664                         conf.bssid = sdata->u.sta.bssid;
 665                 conf.ssid = sdata->u.sta.ssid;
 666                 conf.ssid_len = sdata->u.sta.ssid_len;
 667                 conf.generic_elem = sdata->u.sta.extra_ie;
 668                 conf.generic_elem_len = sdata->u.sta.extra_ie_len;
 669         } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
 670                 conf.ssid = sdata->u.ap.ssid;
 671                 conf.ssid_len = sdata->u.ap.ssid_len;
 672                 conf.generic_elem = sdata->u.ap.generic_elem;
 673                 conf.generic_elem_len = sdata->u.ap.generic_elem_len;
 674                 conf.beacon = beacon;
 675                 conf.beacon_control = control;
 676         }
 677         return local->ops->config_interface(local_to_hw(local),
 678                                            dev->ifindex, &conf);
 679 }
 680
 681 int ieee80211_if_config(struct net_device *dev)
 682 {
 683         return __ieee80211_if_config(dev, NULL, NULL);
 684 }
 685
 686 int ieee80211_if_config_beacon(struct net_device *dev)
 687 {
 688         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 689         struct ieee80211_tx_control control;
 690         struct sk_buff *skb;
 691
 692         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 693                 return 0;
 694         skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
 695         if (!skb)
 696                 return -ENOMEM;
 697         return __ieee80211_if_config(dev, skb, &control);
 698 }
 699
 700 int ieee80211_hw_config(struct ieee80211_local *local)
 701 {
 702         struct ieee80211_hw_mode *mode;
 703         struct ieee80211_channel *chan;
 704         int ret = 0;
 705
 706         if (local->sta_scanning) {
 707                 chan = local->scan_channel;
 708                 mode = local->scan_hw_mode;
 709         } else {
 710                 chan = local->oper_channel;
 711                 mode = local->oper_hw_mode;
 712         }
 713
 714         local->hw.conf.channel = chan->chan;
 715         local->hw.conf.channel_val = chan->val;
 716         local->hw.conf.power_level = chan->power_level;
 717         local->hw.conf.freq = chan->freq;
 718         local->hw.conf.phymode = mode->mode;
 719         local->hw.conf.antenna_max = chan->antenna_max;
 720         local->hw.conf.chan = chan;
 721         local->hw.conf.mode = mode;
 722
 723 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 724         printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
 725                "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
 726                local->hw.conf.phymode);
 727 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 728
 729         if (local->ops->config)
 730                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 731
 732         return ret;
 733 }
 734
 735 void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
 736 {
 737         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 738         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 739         if (local->ops->erp_ie_changed)
 740                 local->ops->erp_ie_changed(local_to_hw(local), changes,
 741                         !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION),
 742                         !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE));
 743 }
 744
 745 void ieee80211_reset_erp_info(struct net_device *dev)
 746 {
 747         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 748
 749         sdata->flags &= ~(IEEE80211_SDATA_USE_PROTECTION |
 750                         IEEE80211_SDATA_SHORT_PREAMBLE);
 751         ieee80211_erp_info_change_notify(dev,
 752                                          IEEE80211_ERP_CHANGE_PROTECTION |
 753                                          IEEE80211_ERP_CHANGE_PREAMBLE);
 754 }
 755
 756 struct dev_mc_list *ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
 757                                                struct dev_mc_list *prev,
 758                                                void **ptr)
 759 {
 760         struct ieee80211_local *local = hw_to_local(hw);
 761         struct ieee80211_sub_if_data *sdata = *ptr;
 762         struct dev_mc_list *mc;
 763
 764         if (!prev) {
 765                 WARN_ON(sdata);
 766                 sdata = NULL;
 767         }
 768         if (!prev || !prev->next) {
 769                 if (sdata)
 770                         sdata = list_entry(sdata->list.next,
 771                                            struct ieee80211_sub_if_data, list);
 772                 else
 773                         sdata = list_entry(local->sub_if_list.next,
 774                                            struct ieee80211_sub_if_data, list);
 775                 if (&sdata->list != &local->sub_if_list)
 776                         mc = sdata->dev->mc_list;
 777                 else
 778                         mc = NULL;
 779         } else
 780                 mc = prev->next;
 781
 782         *ptr = sdata;
 783         return mc;
 784 }
 785 EXPORT_SYMBOL(ieee80211_get_mc_list_item);
 786
 787 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 788                                  struct sk_buff *skb,
 789                                  struct ieee80211_tx_status *status)
 790 {
 791         struct ieee80211_local *local = hw_to_local(hw);
 792         struct ieee80211_tx_status *saved;
 793         int tmp;
 794
 795         skb->dev = local->mdev;
 796         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
 797         if (unlikely(!saved)) {
 798                 if (net_ratelimit())
 799                         printk(KERN_WARNING "%s: Not enough memory, "
 800                                "dropping tx status", skb->dev->name);
 801                 /* should be dev_kfree_skb_irq, but due to this function being
 802                  * named _irqsafe instead of just _irq we can't be sure that
 803                  * people won't call it from non-irq contexts */
 804                 dev_kfree_skb_any(skb);
 805                 return;
 806         }
 807         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
 808         /* copy pointer to saved status into skb->cb for use by tasklet */
 809         memcpy(skb->cb, &saved, sizeof(saved));
 810
 811         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 812         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
 813                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 814         tmp = skb_queue_len(&local->skb_queue) +
 815                 skb_queue_len(&local->skb_queue_unreliable);
 816         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 817                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 818                 memcpy(&saved, skb->cb, sizeof(saved));
 819                 kfree(saved);
 820                 dev_kfree_skb_irq(skb);
 821                 tmp--;
 822                 I802_DEBUG_INC(local->tx_status_drop);
 823         }
 824         tasklet_schedule(&local->tasklet);
 825 }
 826 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 827
 828 static void ieee80211_tasklet_handler(unsigned long data)
 829 {
 830         struct ieee80211_local *local = (struct ieee80211_local *) data;
 831         struct sk_buff *skb;
 832         struct ieee80211_rx_status rx_status;
 833         struct ieee80211_tx_status *tx_status;
 834
 835         while ((skb = skb_dequeue(&local->skb_queue)) ||
 836                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 837                 switch (skb->pkt_type) {
 838                 case IEEE80211_RX_MSG:
 839                         /* status is in skb->cb */
 840                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 841                         /* Clear skb->type in order to not confuse kernel
 842                          * netstack. */
 843                         skb->pkt_type = 0;
 844                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 845                         break;
 846                 case IEEE80211_TX_STATUS_MSG:
 847                         /* get pointer to saved status out of skb->cb */
 848                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
 849                         skb->pkt_type = 0;
 850                         ieee80211_tx_status(local_to_hw(local),
 851                                             skb, tx_status);
 852                         kfree(tx_status);
 853                         break;
 854                 default: /* should never get here! */
 855                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
 856                                local->mdev->name, skb->pkt_type);
 857                         dev_kfree_skb(skb);
 858                         break;
 859                 }
 860         }
 861 }
 862
 863 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 864  * make a prepared TX frame (one that has been given to hw) to look like brand
 865  * new IEEE 802.11 frame that is ready to go through TX processing again.
 866  * Also, tx_packet_data in cb is restored from tx_control. */
 867 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 868                                       struct ieee80211_key *key,
 869                                       struct sk_buff *skb,
 870                                       struct ieee80211_tx_control *control)
 871 {
 872         int hdrlen, iv_len, mic_len;
 873         struct ieee80211_tx_packet_data *pkt_data;
 874
 875         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 876         pkt_data->ifindex = control->ifindex;
 877         pkt_data->flags = 0;
 878         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
 879                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
 880         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
 881                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 882         if (control->flags & IEEE80211_TXCTL_REQUEUE)
 883                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 884         if (control->type == IEEE80211_IF_TYPE_MGMT)
 885                 pkt_data->flags |= IEEE80211_TXPD_MGMT_IFACE;
 886         pkt_data->queue = control->queue;
 887
 888         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 889
 890         if (!key)
 891                 goto no_key;
 892
 893         switch (key->conf.alg) {
 894         case ALG_WEP:
 895                 iv_len = WEP_IV_LEN;
 896                 mic_len = WEP_ICV_LEN;
 897                 break;
 898         case ALG_TKIP:
 899                 iv_len = TKIP_IV_LEN;
 900                 mic_len = TKIP_ICV_LEN;
 901                 break;
 902         case ALG_CCMP:
 903                 iv_len = CCMP_HDR_LEN;
 904                 mic_len = CCMP_MIC_LEN;
 905                 break;
 906         default:
 907                 goto no_key;
 908         }
 909
 910         if (skb->len >= mic_len &&
 911             (key->conf.flags & IEEE80211_KEY_FORCE_SW_ENCRYPT))
 912                 skb_trim(skb, skb->len - mic_len);
 913         if (skb->len >= iv_len && skb->len > hdrlen) {
 914                 memmove(skb->data + iv_len, skb->data, hdrlen);
 915                 skb_pull(skb, iv_len);
 916         }
 917
 918 no_key:
 919         {
 920                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 921                 u16 fc = le16_to_cpu(hdr->frame_control);
 922                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
 923                         fc &= ~IEEE80211_STYPE_QOS_DATA;
 924                         hdr->frame_control = cpu_to_le16(fc);
 925                         memmove(skb->data + 2, skb->data, hdrlen - 2);
 926                         skb_pull(skb, 2);
 927                 }
 928         }
 929 }
 930
 931 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 932                          struct ieee80211_tx_status *status)
 933 {
 934         struct sk_buff *skb2;
 935         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 936         struct ieee80211_local *local = hw_to_local(hw);
 937         u16 frag, type;
 938         u32 msg_type;
 939         struct ieee80211_tx_status_rtap_hdr *rthdr;
 940         struct ieee80211_sub_if_data *sdata;
 941         int monitors;
 942
 943         if (!status) {
 944                 printk(KERN_ERR
 945                        "%s: ieee80211_tx_status called with NULL status\n",
 946                        local->mdev->name);
 947                 dev_kfree_skb(skb);
 948                 return;
 949         }
 950
 951         if (status->excessive_retries) {
 952                 struct sta_info *sta;
 953                 sta = sta_info_get(local, hdr->addr1);
 954                 if (sta) {
 955                         if (sta->flags & WLAN_STA_PS) {
 956                                 /* The STA is in power save mode, so assume
 957                                  * that this TX packet failed because of that.
 958                                  */
 959                                 status->excessive_retries = 0;
 960                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
 961                         }
 962                         sta_info_put(sta);
 963                 }
 964         }
 965
 966         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
 967                 struct sta_info *sta;
 968                 sta = sta_info_get(local, hdr->addr1);
 969                 if (sta) {
 970                         sta->tx_filtered_count++;
 971
 972                         /* Clear the TX filter mask for this STA when sending
 973                          * the next packet. If the STA went to power save mode,
 974                          * this will happen when it is waking up for the next
 975                          * time. */
 976                         sta->clear_dst_mask = 1;
 977
 978                         /* TODO: Is the WLAN_STA_PS flag always set here or is
 979                          * the race between RX and TX status causing some
 980                          * packets to be filtered out before 80211.o gets an
 981                          * update for PS status? This seems to be the case, so
 982                          * no changes are likely to be needed. */
 983                         if (sta->flags & WLAN_STA_PS &&
 984                             skb_queue_len(&sta->tx_filtered) <
 985                             STA_MAX_TX_BUFFER) {
 986                                 ieee80211_remove_tx_extra(local, sta->key,
 987                                                           skb,
 988                                                           &status->control);
 989                                 skb_queue_tail(&sta->tx_filtered, skb);
 990                         } else if (!(sta->flags & WLAN_STA_PS) &&
 991                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
 992                                 /* Software retry the packet once */
 993                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
 994                                 ieee80211_remove_tx_extra(local, sta->key,
 995                                                           skb,
 996                                                           &status->control);
 997                                 dev_queue_xmit(skb);
 998                         } else {
 999                                 if (net_ratelimit()) {
1000                                         printk(KERN_DEBUG "%s: dropped TX "
1001                                                "filtered frame queue_len=%d "
1002                                                "PS=%d @%lu\n",
1003                                                local->mdev->name,
1004                                                skb_queue_len(
1005                                                        &sta->tx_filtered),
1006                                                !!(sta->flags & WLAN_STA_PS),
1007                                                jiffies);
1008                                 }
1009                                 dev_kfree_skb(skb);
1010                         }
1011                         sta_info_put(sta);
1012                         return;
1013                 }
1014         } else {
1015                 /* FIXME: STUPID to call this with both local and local->mdev */
1016                 rate_control_tx_status(local, local->mdev, skb, status);
1017         }
1018
1019         ieee80211_led_tx(local, 0);
1020
1021         /* SNMP counters
1022          * Fragments are passed to low-level drivers as separate skbs, so these
1023          * are actually fragments, not frames. Update frame counters only for
1024          * the first fragment of the frame. */
1025
1026         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1027         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1028
1029         if (status->flags & IEEE80211_TX_STATUS_ACK) {
1030                 if (frag == 0) {
1031                         local->dot11TransmittedFrameCount++;
1032                         if (is_multicast_ether_addr(hdr->addr1))
1033                                 local->dot11MulticastTransmittedFrameCount++;
1034                         if (status->retry_count > 0)
1035                                 local->dot11RetryCount++;
1036                         if (status->retry_count > 1)
1037                                 local->dot11MultipleRetryCount++;
1038                 }
1039
1040                 /* This counter shall be incremented for an acknowledged MPDU
1041                  * with an individual address in the address 1 field or an MPDU
1042                  * with a multicast address in the address 1 field of type Data
1043                  * or Management. */
1044                 if (!is_multicast_ether_addr(hdr->addr1) ||
1045                     type == IEEE80211_FTYPE_DATA ||
1046                     type == IEEE80211_FTYPE_MGMT)
1047                         local->dot11TransmittedFragmentCount++;
1048         } else {
1049                 if (frag == 0)
1050                         local->dot11FailedCount++;
1051         }
1052
1053         msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
1054                 ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
1055
1056         /* this was a transmitted frame, but now we want to reuse it */
1057         skb_orphan(skb);
1058
1059         if ((status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS) &&
1060             local->apdev) {
1061                 if (local->monitors) {
1062                         skb2 = skb_clone(skb, GFP_ATOMIC);
1063                 } else {
1064                         skb2 = skb;
1065                         skb = NULL;
1066                 }
1067
1068                 if (skb2)
1069                         /* Send frame to hostapd */
1070                         ieee80211_rx_mgmt(local, skb2, NULL, msg_type);
1071
1072                 if (!skb)
1073                         return;
1074         }
1075
1076         if (!local->monitors) {
1077                 dev_kfree_skb(skb);
1078                 return;
1079         }
1080
1081         /* send frame to monitor interfaces now */
1082
1083         if (skb_headroom(skb) < sizeof(*rthdr)) {
1084                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1085                 dev_kfree_skb(skb);
1086                 return;
1087         }
1088
1089         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
1090                                 skb_push(skb, sizeof(*rthdr));
1091
1092         memset(rthdr, 0, sizeof(*rthdr));
1093         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1094         rthdr->hdr.it_present =
1095                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1096                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1097
1098         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
1099             !is_multicast_ether_addr(hdr->addr1))
1100                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1101
1102         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
1103             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
1104                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1105         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
1106                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1107
1108         rthdr->data_retries = status->retry_count;
1109
1110         read_lock(&local->sub_if_lock);
1111         monitors = local->monitors;
1112         list_for_each_entry(sdata, &local->sub_if_list, list) {
1113                 /*
1114                  * Using the monitors counter is possibly racy, but
1115                  * if the value is wrong we simply either clone the skb
1116                  * once too much or forget sending it to one monitor iface
1117                  * The latter case isn't nice but fixing the race is much
1118                  * more complicated.
1119                  */
1120                 if (!monitors || !skb)
1121                         goto out;
1122
1123                 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
1124                         if (!netif_running(sdata->dev))
1125                                 continue;
1126                         monitors--;
1127                         if (monitors)
1128                                 skb2 = skb_clone(skb, GFP_KERNEL);
1129                         else
1130                                 skb2 = NULL;
1131                         skb->dev = sdata->dev;
1132                         /* XXX: is this sufficient for BPF? */
1133                         skb_set_mac_header(skb, 0);
1134                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1135                         skb->pkt_type = PACKET_OTHERHOST;
1136                         skb->protocol = htons(ETH_P_802_2);
1137                         memset(skb->cb, 0, sizeof(skb->cb));
1138                         netif_rx(skb);
1139                         skb = skb2;
1140                 }
1141         }
1142  out:
1143         read_unlock(&local->sub_if_lock);
1144         if (skb)
1145                 dev_kfree_skb(skb);
1146 }
1147 EXPORT_SYMBOL(ieee80211_tx_status);
1148
1149 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1150                                         const struct ieee80211_ops *ops)
1151 {
1152         struct net_device *mdev;
1153         struct ieee80211_local *local;
1154         struct ieee80211_sub_if_data *sdata;
1155         int priv_size;
1156         struct wiphy *wiphy;
1157
1158         /* Ensure 32-byte alignment of our private data and hw private data.
1159          * We use the wiphy priv data for both our ieee80211_local and for
1160          * the driver's private data
1161          *
1162          * In memory it'll be like this:
1163          *
1164          * +-------------------------+
1165          * | struct wiphy           |
1166          * +-------------------------+
1167          * | struct ieee80211_local  |
1168          * +-------------------------+
1169          * | driver's private data   |
1170          * +-------------------------+
1171          *
1172          */
1173         priv_size = ((sizeof(struct ieee80211_local) +
1174                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1175                     priv_data_len;
1176
1177         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1178
1179         if (!wiphy)
1180                 return NULL;
1181
1182         wiphy->privid = mac80211_wiphy_privid;
1183
1184         local = wiphy_priv(wiphy);
1185         local->hw.wiphy = wiphy;
1186
1187         local->hw.priv = (char *)local +
1188                          ((sizeof(struct ieee80211_local) +
1189                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1190
1191         BUG_ON(!ops->tx);
1192         BUG_ON(!ops->config);
1193         BUG_ON(!ops->add_interface);
1194         local->ops = ops;
1195
1196         /* for now, mdev needs sub_if_data :/ */
1197         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1198                             "wmaster%d", ether_setup);
1199         if (!mdev) {
1200                 wiphy_free(wiphy);
1201                 return NULL;
1202         }
1203
1204         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1205         mdev->ieee80211_ptr = &sdata->wdev;
1206         sdata->wdev.wiphy = wiphy;
1207
1208         local->hw.queues = 1; /* default */
1209
1210         local->mdev = mdev;
1211         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
1212         local->rx_handlers = ieee80211_rx_handlers;
1213         local->tx_handlers = ieee80211_tx_handlers;
1214
1215         local->bridge_packets = 1;
1216
1217         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1218         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1219         local->short_retry_limit = 7;
1220         local->long_retry_limit = 4;
1221         local->hw.conf.radio_enabled = 1;
1222
1223         local->enabled_modes = (unsigned int) -1;
1224
1225         INIT_LIST_HEAD(&local->modes_list);
1226
1227         rwlock_init(&local->sub_if_lock);
1228         INIT_LIST_HEAD(&local->sub_if_list);
1229
1230         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1231         ieee80211_rx_bss_list_init(mdev);
1232
1233         sta_info_init(local);
1234
1235         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1236         mdev->open = ieee80211_master_open;
1237         mdev->stop = ieee80211_master_stop;
1238         mdev->type = ARPHRD_IEEE80211;
1239         mdev->hard_header_parse = header_parse_80211;
1240
1241         sdata->type = IEEE80211_IF_TYPE_AP;
1242         sdata->dev = mdev;
1243         sdata->local = local;
1244         sdata->u.ap.force_unicast_rateidx = -1;
1245         sdata->u.ap.max_ratectrl_rateidx = -1;
1246         ieee80211_if_sdata_init(sdata);
1247         list_add_tail(&sdata->list, &local->sub_if_list);
1248
1249         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1250                      (unsigned long)local);
1251         tasklet_disable(&local->tx_pending_tasklet);
1252
1253         tasklet_init(&local->tasklet,
1254                      ieee80211_tasklet_handler,
1255                      (unsigned long) local);
1256         tasklet_disable(&local->tasklet);
1257
1258         skb_queue_head_init(&local->skb_queue);
1259         skb_queue_head_init(&local->skb_queue_unreliable);
1260
1261         return local_to_hw(local);
1262 }
1263 EXPORT_SYMBOL(ieee80211_alloc_hw);
1264
1265 int ieee80211_register_hw(struct ieee80211_hw *hw)
1266 {
1267         struct ieee80211_local *local = hw_to_local(hw);
1268         const char *name;
1269         int result;
1270
1271         result = wiphy_register(local->hw.wiphy);
1272         if (result < 0)
1273                 return result;
1274
1275         name = wiphy_dev(local->hw.wiphy)->driver->name;
1276         local->hw.workqueue = create_singlethread_workqueue(name);
1277         if (!local->hw.workqueue) {
1278                 result = -ENOMEM;
1279                 goto fail_workqueue;
1280         }
1281
1282         /*
1283          * The hardware needs headroom for sending the frame,
1284          * and we need some headroom for passing the frame to monitor
1285          * interfaces, but never both at the same time.
1286          */
1287         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1288                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1289
1290         debugfs_hw_add(local);
1291
1292         local->hw.conf.beacon_int = 1000;
1293
1294         local->wstats_flags |= local->hw.max_rssi ?
1295                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1296         local->wstats_flags |= local->hw.max_signal ?
1297                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1298         local->wstats_flags |= local->hw.max_noise ?
1299                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1300         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1301                 local->wstats_flags |= IW_QUAL_DBM;
1302
1303         result = sta_info_start(local);
1304         if (result < 0)
1305                 goto fail_sta_info;
1306
1307         rtnl_lock();
1308         result = dev_alloc_name(local->mdev, local->mdev->name);
1309         if (result < 0)
1310                 goto fail_dev;
1311
1312         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1313         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1314
1315         result = register_netdevice(local->mdev);
1316         if (result < 0)
1317                 goto fail_dev;
1318
1319         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1320
1321         result = ieee80211_init_rate_ctrl_alg(local, NULL);
1322         if (result < 0) {
1323                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1324                        "algorithm\n", local->mdev->name);
1325                 goto fail_rate;
1326         }
1327
1328         result = ieee80211_wep_init(local);
1329
1330         if (result < 0) {
1331                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1332                        local->mdev->name);
1333                 goto fail_wep;
1334         }
1335
1336         ieee80211_install_qdisc(local->mdev);
1337
1338         /* add one default STA interface */
1339         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1340                                   IEEE80211_IF_TYPE_STA);
1341         if (result)
1342                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1343                        local->mdev->name);
1344
1345         local->reg_state = IEEE80211_DEV_REGISTERED;
1346         rtnl_unlock();
1347
1348         ieee80211_led_init(local);
1349
1350         return 0;
1351
1352 fail_wep:
1353         rate_control_deinitialize(local);
1354 fail_rate:
1355         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1356         unregister_netdevice(local->mdev);
1357 fail_dev:
1358         rtnl_unlock();
1359         sta_info_stop(local);
1360 fail_sta_info:
1361         debugfs_hw_del(local);
1362         destroy_workqueue(local->hw.workqueue);
1363 fail_workqueue:
1364         wiphy_unregister(local->hw.wiphy);
1365         return result;
1366 }
1367 EXPORT_SYMBOL(ieee80211_register_hw);
1368
1369 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
1370                               struct ieee80211_hw_mode *mode)
1371 {
1372         struct ieee80211_local *local = hw_to_local(hw);
1373         struct ieee80211_rate *rate;
1374         int i;
1375
1376         INIT_LIST_HEAD(&mode->list);
1377         list_add_tail(&mode->list, &local->modes_list);
1378
1379         local->hw_modes |= (1 << mode->mode);
1380         for (i = 0; i < mode->num_rates; i++) {
1381                 rate = &(mode->rates[i]);
1382                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
1383         }
1384         ieee80211_prepare_rates(local, mode);
1385
1386         if (!local->oper_hw_mode) {
1387                 /* Default to this mode */
1388                 local->hw.conf.phymode = mode->mode;
1389                 local->oper_hw_mode = local->scan_hw_mode = mode;
1390                 local->oper_channel = local->scan_channel = &mode->channels[0];
1391                 local->hw.conf.mode = local->oper_hw_mode;
1392                 local->hw.conf.chan = local->oper_channel;
1393         }
1394
1395         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
1396                 ieee80211_set_default_regdomain(mode);
1397
1398         return 0;
1399 }
1400 EXPORT_SYMBOL(ieee80211_register_hwmode);
1401
1402 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1403 {
1404         struct ieee80211_local *local = hw_to_local(hw);
1405         struct ieee80211_sub_if_data *sdata, *tmp;
1406         struct list_head tmp_list;
1407         int i;
1408
1409         tasklet_kill(&local->tx_pending_tasklet);
1410         tasklet_kill(&local->tasklet);
1411
1412         rtnl_lock();
1413
1414         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1415
1416         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1417         if (local->apdev)
1418                 ieee80211_if_del_mgmt(local);
1419
1420         write_lock_bh(&local->sub_if_lock);
1421         list_replace_init(&local->sub_if_list, &tmp_list);
1422         write_unlock_bh(&local->sub_if_lock);
1423
1424         list_for_each_entry_safe(sdata, tmp, &tmp_list, list)
1425                 __ieee80211_if_del(local, sdata);
1426
1427         rtnl_unlock();
1428
1429         ieee80211_rx_bss_list_deinit(local->mdev);
1430         ieee80211_clear_tx_pending(local);
1431         sta_info_stop(local);
1432         rate_control_deinitialize(local);
1433         debugfs_hw_del(local);
1434
1435         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
1436                 kfree(local->supp_rates[i]);
1437                 kfree(local->basic_rates[i]);
1438         }
1439
1440         if (skb_queue_len(&local->skb_queue)
1441                         || skb_queue_len(&local->skb_queue_unreliable))
1442                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1443                        local->mdev->name);
1444         skb_queue_purge(&local->skb_queue);
1445         skb_queue_purge(&local->skb_queue_unreliable);
1446
1447         destroy_workqueue(local->hw.workqueue);
1448         wiphy_unregister(local->hw.wiphy);
1449         ieee80211_wep_free(local);
1450         ieee80211_led_exit(local);
1451 }
1452 EXPORT_SYMBOL(ieee80211_unregister_hw);
1453
1454 void ieee80211_free_hw(struct ieee80211_hw *hw)
1455 {
1456         struct ieee80211_local *local = hw_to_local(hw);
1457
1458         ieee80211_if_free(local->mdev);
1459         wiphy_free(local->hw.wiphy);
1460 }
1461 EXPORT_SYMBOL(ieee80211_free_hw);
1462
1463 struct net_device_stats *ieee80211_dev_stats(struct net_device *dev)
1464 {
1465         struct ieee80211_sub_if_data *sdata;
1466         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1467         return &sdata->stats;
1468 }
1469
1470 static int __init ieee80211_init(void)
1471 {
1472         struct sk_buff *skb;
1473         int ret;
1474
1475         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1476
1477         ret = ieee80211_wme_register();
1478         if (ret) {
1479                 printk(KERN_DEBUG "ieee80211_init: failed to "
1480                        "initialize WME (err=%d)\n", ret);
1481                 return ret;
1482         }
1483
1484         ieee80211_debugfs_netdev_init();
1485         ieee80211_regdomain_init();
1486
1487         return 0;
1488 }
1489
1490 static void __exit ieee80211_exit(void)
1491 {
1492         ieee80211_wme_unregister();
1493         ieee80211_debugfs_netdev_exit();
1494 }
1495
1496
1497 subsys_initcall(ieee80211_init);
1498 module_exit(ieee80211_exit);
1499
1500 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1501 MODULE_LICENSE("GPL");