net/mac80211/ieee80211_iface.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright (c) 2006 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 #include <linux/kernel.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/rtnetlink.h>
  14 #include <net/mac80211.h>
  15 #include "ieee80211_i.h"
  16 #include "sta_info.h"
  17
  18 void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
  19 {
  20         int i;
  21
  22         /* Default values for sub-interface parameters */
  23         sdata->drop_unencrypted = 0;
  24         sdata->eapol = 1;
  25         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  26                 skb_queue_head_init(&sdata->fragments[i].skb_list);
  27 }
  28
  29 static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
  30 {
  31         int i;
  32
  33         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
  34                 __skb_queue_purge(&sdata->fragments[i].skb_list);
  35         }
  36 }
  37
  38 /* Must be called with rtnl lock held. */
  39 int ieee80211_if_add(struct net_device *dev, const char *name,
  40                      struct net_device **new_dev, int type)
  41 {
  42         struct net_device *ndev;
  43         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  44         struct ieee80211_sub_if_data *sdata = NULL;
  45         int ret;
  46
  47         ASSERT_RTNL();
  48         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
  49                             name, ieee80211_if_setup);
  50         if (!ndev)
  51                 return -ENOMEM;
  52
  53         ret = dev_alloc_name(ndev, ndev->name);
  54         if (ret < 0)
  55                 goto fail;
  56
  57         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  58         ndev->base_addr = dev->base_addr;
  59         ndev->irq = dev->irq;
  60         ndev->mem_start = dev->mem_start;
  61         ndev->mem_end = dev->mem_end;
  62         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  63
  64         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
  65         ndev->ieee80211_ptr = &sdata->wdev;
  66         sdata->wdev.wiphy = local->hw.wiphy;
  67         sdata->type = IEEE80211_IF_TYPE_AP;
  68         sdata->dev = ndev;
  69         sdata->local = local;
  70         ieee80211_if_sdata_init(sdata);
  71
  72         ret = register_netdevice(ndev);
  73         if (ret)
  74                 goto fail;
  75
  76         ieee80211_if_set_type(ndev, type);
  77
  78         write_lock_bh(&local->sub_if_lock);
  79         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
  80                 write_unlock_bh(&local->sub_if_lock);
  81                 __ieee80211_if_del(local, sdata);
  82                 return -ENODEV;
  83         }
  84         list_add(&sdata->list, &local->sub_if_list);
  85         if (new_dev)
  86                 *new_dev = ndev;
  87         write_unlock_bh(&local->sub_if_lock);
  88
  89         ieee80211_update_default_wep_only(local);
  90
  91         return 0;
  92
  93 fail:
  94         free_netdev(ndev);
  95         return ret;
  96 }
  97
  98 int ieee80211_if_add_mgmt(struct ieee80211_local *local)
  99 {
 100         struct net_device *ndev;
 101         struct ieee80211_sub_if_data *nsdata;
 102         int ret;
 103
 104         ASSERT_RTNL();
 105
 106         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "wmgmt%d",
 107                             ieee80211_if_mgmt_setup);
 108         if (!ndev)
 109                 return -ENOMEM;
 110         ret = dev_alloc_name(ndev, ndev->name);
 111         if (ret < 0)
 112                 goto fail;
 113
 114         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 115         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 116
 117         nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 118         ndev->ieee80211_ptr = &nsdata->wdev;
 119         nsdata->wdev.wiphy = local->hw.wiphy;
 120         nsdata->type = IEEE80211_IF_TYPE_MGMT;
 121         nsdata->dev = ndev;
 122         nsdata->local = local;
 123         ieee80211_if_sdata_init(nsdata);
 124
 125         ret = register_netdevice(ndev);
 126         if (ret)
 127                 goto fail;
 128
 129         if (local->open_count > 0)
 130                 dev_open(ndev);
 131         local->apdev = ndev;
 132         return 0;
 133
 134 fail:
 135         free_netdev(ndev);
 136         return ret;
 137 }
 138
 139 void ieee80211_if_del_mgmt(struct ieee80211_local *local)
 140 {
 141         struct net_device *apdev;
 142
 143         ASSERT_RTNL();
 144         apdev = local->apdev;
 145         local->apdev = NULL;
 146         unregister_netdevice(apdev);
 147 }
 148
 149 void ieee80211_if_set_type(struct net_device *dev, int type)
 150 {
 151         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 152         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 153
 154         sdata->type = type;
 155         switch (type) {
 156         case IEEE80211_IF_TYPE_WDS:
 157                 sdata->bss = NULL;
 158                 break;
 159         case IEEE80211_IF_TYPE_VLAN:
 160                 break;
 161         case IEEE80211_IF_TYPE_AP:
 162                 sdata->u.ap.dtim_period = 2;
 163                 sdata->u.ap.force_unicast_rateidx = -1;
 164                 sdata->u.ap.max_ratectrl_rateidx = -1;
 165                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 166                 sdata->bss = &sdata->u.ap;
 167                 break;
 168         case IEEE80211_IF_TYPE_STA:
 169         case IEEE80211_IF_TYPE_IBSS: {
 170                 struct ieee80211_sub_if_data *msdata;
 171                 struct ieee80211_if_sta *ifsta;
 172
 173                 ifsta = &sdata->u.sta;
 174                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 175                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 176                             (unsigned long) sdata);
 177                 skb_queue_head_init(&ifsta->skb_queue);
 178
 179                 ifsta->capab = WLAN_CAPABILITY_ESS;
 180                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 181                         IEEE80211_AUTH_ALG_SHARED_KEY;
 182                 ifsta->create_ibss = 1;
 183                 ifsta->wmm_enabled = 1;
 184                 ifsta->auto_channel_sel = 1;
 185                 ifsta->auto_bssid_sel = 1;
 186
 187                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 188                 sdata->bss = &msdata->u.ap;
 189                 break;
 190         }
 191         case IEEE80211_IF_TYPE_MNTR:
 192                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 193                 break;
 194         default:
 195                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 196                        dev->name, __FUNCTION__, type);
 197         }
 198         ieee80211_update_default_wep_only(local);
 199 }
 200
 201 /* Must be called with rtnl lock held. */
 202 void ieee80211_if_reinit(struct net_device *dev)
 203 {
 204         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 205         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 206         struct sta_info *sta;
 207         int i;
 208
 209         ASSERT_RTNL();
 210         ieee80211_if_sdata_deinit(sdata);
 211         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 212                 if (!sdata->keys[i])
 213                         continue;
 214 #if 0
 215                 /* The interface is down at the moment, so there is not
 216                  * really much point in disabling the keys at this point. */
 217                 memset(addr, 0xff, ETH_ALEN);
 218                 if (local->ops->set_key)
 219                         local->ops->set_key(local_to_hw(local), DISABLE_KEY, addr,
 220                                             local->keys[i], 0);
 221 #endif
 222                 ieee80211_key_free(sdata->keys[i]);
 223                 sdata->keys[i] = NULL;
 224         }
 225
 226         switch (sdata->type) {
 227         case IEEE80211_IF_TYPE_AP: {
 228                 /* Remove all virtual interfaces that use this BSS
 229                  * as their sdata->bss */
 230                 struct ieee80211_sub_if_data *tsdata, *n;
 231                 LIST_HEAD(tmp_list);
 232
 233                 write_lock_bh(&local->sub_if_lock);
 234                 list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
 235                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 236                                 printk(KERN_DEBUG "%s: removing virtual "
 237                                        "interface %s because its BSS interface"
 238                                        " is being removed\n",
 239                                        sdata->dev->name, tsdata->dev->name);
 240                                 list_move_tail(&tsdata->list, &tmp_list);
 241                         }
 242                 }
 243                 write_unlock_bh(&local->sub_if_lock);
 244
 245                 list_for_each_entry_safe(tsdata, n, &tmp_list, list)
 246                         __ieee80211_if_del(local, tsdata);
 247
 248                 kfree(sdata->u.ap.beacon_head);
 249                 kfree(sdata->u.ap.beacon_tail);
 250                 kfree(sdata->u.ap.generic_elem);
 251
 252                 if (dev != local->mdev) {
 253                         struct sk_buff *skb;
 254                         while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 255                                 local->total_ps_buffered--;
 256                                 dev_kfree_skb(skb);
 257                         }
 258                 }
 259
 260                 break;
 261         }
 262         case IEEE80211_IF_TYPE_WDS:
 263                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 264                 if (sta) {
 265                         sta_info_put(sta);
 266                         sta_info_free(sta, 0);
 267                 } else {
 268 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 269                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 270                                "entry for the WDS link\n", dev->name);
 271 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 272                 }
 273                 break;
 274         case IEEE80211_IF_TYPE_STA:
 275         case IEEE80211_IF_TYPE_IBSS:
 276                 kfree(sdata->u.sta.extra_ie);
 277                 sdata->u.sta.extra_ie = NULL;
 278                 kfree(sdata->u.sta.assocreq_ies);
 279                 sdata->u.sta.assocreq_ies = NULL;
 280                 kfree(sdata->u.sta.assocresp_ies);
 281                 sdata->u.sta.assocresp_ies = NULL;
 282                 if (sdata->u.sta.probe_resp) {
 283                         dev_kfree_skb(sdata->u.sta.probe_resp);
 284                         sdata->u.sta.probe_resp = NULL;
 285                 }
 286
 287                 break;
 288         case IEEE80211_IF_TYPE_MNTR:
 289                 dev->type = ARPHRD_ETHER;
 290                 break;
 291         }
 292
 293         /* remove all STAs that are bound to this virtual interface */
 294         sta_info_flush(local, dev);
 295
 296         memset(&sdata->u, 0, sizeof(sdata->u));
 297         ieee80211_if_sdata_init(sdata);
 298 }
 299
 300 /* Must be called with rtnl lock held. */
 301 void __ieee80211_if_del(struct ieee80211_local *local,
 302                         struct ieee80211_sub_if_data *sdata)
 303 {
 304         struct net_device *dev = sdata->dev;
 305
 306         unregister_netdevice(dev);
 307         /* Except master interface, the net_device will be freed by
 308          * net_device->destructor (i. e. ieee80211_if_free). */
 309 }
 310
 311 /* Must be called with rtnl lock held. */
 312 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 313 {
 314         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 315         struct ieee80211_sub_if_data *sdata, *n;
 316
 317         ASSERT_RTNL();
 318
 319         write_lock_bh(&local->sub_if_lock);
 320         list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
 321                 if ((sdata->type == id || id == -1) &&
 322                     strcmp(name, sdata->dev->name) == 0 &&
 323                     sdata->dev != local->mdev) {
 324                         list_del(&sdata->list);
 325                         write_unlock_bh(&local->sub_if_lock);
 326                         __ieee80211_if_del(local, sdata);
 327                         ieee80211_update_default_wep_only(local);
 328                         return 0;
 329                 }
 330         }
 331         write_unlock_bh(&local->sub_if_lock);
 332         return -ENODEV;
 333 }
 334
 335 void ieee80211_if_free(struct net_device *dev)
 336 {
 337         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 338         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 339
 340         /* local->apdev must be NULL when freeing management interface */
 341         BUG_ON(dev == local->apdev);
 342         ieee80211_if_sdata_deinit(sdata);
 343         free_netdev(dev);
 344 }