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 #include "debugfs_netdev.h"
  18
  19 void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
  20 {
  21         int i;
  22
  23         /* Default values for sub-interface parameters */
  24         sdata->drop_unencrypted = 0;
  25         sdata->eapol = 1;
  26         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  27                 skb_queue_head_init(&sdata->fragments[i].skb_list);
  28 }
  29
  30 static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
  31 {
  32         int i;
  33
  34         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
  35                 __skb_queue_purge(&sdata->fragments[i].skb_list);
  36         }
  37 }
  38
  39 /* Must be called with rtnl lock held. */
  40 int ieee80211_if_add(struct net_device *dev, const char *name,
  41                      struct net_device **new_dev, int type)
  42 {
  43         struct net_device *ndev;
  44         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  45         struct ieee80211_sub_if_data *sdata = NULL;
  46         int ret;
  47
  48         ASSERT_RTNL();
  49         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
  50                             name, ieee80211_if_setup);
  51         if (!ndev)
  52                 return -ENOMEM;
  53
  54         ret = dev_alloc_name(ndev, ndev->name);
  55         if (ret < 0)
  56                 goto fail;
  57
  58         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  59         ndev->base_addr = dev->base_addr;
  60         ndev->irq = dev->irq;
  61         ndev->mem_start = dev->mem_start;
  62         ndev->mem_end = dev->mem_end;
  63         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  64
  65         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
  66         ndev->ieee80211_ptr = &sdata->wdev;
  67         sdata->wdev.wiphy = local->hw.wiphy;
  68         sdata->type = IEEE80211_IF_TYPE_AP;
  69         sdata->dev = ndev;
  70         sdata->local = local;
  71         ieee80211_if_sdata_init(sdata);
  72
  73         ret = register_netdevice(ndev);
  74         if (ret)
  75                 goto fail;
  76
  77         ieee80211_debugfs_add_netdev(sdata);
  78         ieee80211_if_set_type(ndev, type);
  79
  80         write_lock_bh(&local->sub_if_lock);
  81         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
  82                 write_unlock_bh(&local->sub_if_lock);
  83                 __ieee80211_if_del(local, sdata);
  84                 return -ENODEV;
  85         }
  86         list_add(&sdata->list, &local->sub_if_list);
  87         if (new_dev)
  88                 *new_dev = ndev;
  89         write_unlock_bh(&local->sub_if_lock);
  90
  91         ieee80211_update_default_wep_only(local);
  92
  93         return 0;
  94
  95 fail:
  96         free_netdev(ndev);
  97         return ret;
  98 }
  99
 100 int ieee80211_if_add_mgmt(struct ieee80211_local *local)
 101 {
 102         struct net_device *ndev;
 103         struct ieee80211_sub_if_data *nsdata;
 104         int ret;
 105
 106         ASSERT_RTNL();
 107
 108         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "wmgmt%d",
 109                             ieee80211_if_mgmt_setup);
 110         if (!ndev)
 111                 return -ENOMEM;
 112         ret = dev_alloc_name(ndev, ndev->name);
 113         if (ret < 0)
 114                 goto fail;
 115
 116         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 117         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 118
 119         nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 120         ndev->ieee80211_ptr = &nsdata->wdev;
 121         nsdata->wdev.wiphy = local->hw.wiphy;
 122         nsdata->type = IEEE80211_IF_TYPE_MGMT;
 123         nsdata->dev = ndev;
 124         nsdata->local = local;
 125         ieee80211_if_sdata_init(nsdata);
 126
 127         ret = register_netdevice(ndev);
 128         if (ret)
 129                 goto fail;
 130
 131         ieee80211_debugfs_add_netdev(nsdata);
 132
 133         if (local->open_count > 0)
 134                 dev_open(ndev);
 135         local->apdev = ndev;
 136         return 0;
 137
 138 fail:
 139         free_netdev(ndev);
 140         return ret;
 141 }
 142
 143 void ieee80211_if_del_mgmt(struct ieee80211_local *local)
 144 {
 145         struct net_device *apdev;
 146
 147         ASSERT_RTNL();
 148         apdev = local->apdev;
 149         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(apdev));
 150         local->apdev = NULL;
 151         unregister_netdevice(apdev);
 152 }
 153
 154 void ieee80211_if_set_type(struct net_device *dev, int type)
 155 {
 156         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 157         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 158         int oldtype = sdata->type;
 159
 160         sdata->type = type;
 161         switch (type) {
 162         case IEEE80211_IF_TYPE_WDS:
 163                 sdata->bss = NULL;
 164                 break;
 165         case IEEE80211_IF_TYPE_VLAN:
 166                 break;
 167         case IEEE80211_IF_TYPE_AP:
 168                 sdata->u.ap.dtim_period = 2;
 169                 sdata->u.ap.force_unicast_rateidx = -1;
 170                 sdata->u.ap.max_ratectrl_rateidx = -1;
 171                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 172                 sdata->bss = &sdata->u.ap;
 173                 break;
 174         case IEEE80211_IF_TYPE_STA:
 175         case IEEE80211_IF_TYPE_IBSS: {
 176                 struct ieee80211_sub_if_data *msdata;
 177                 struct ieee80211_if_sta *ifsta;
 178
 179                 ifsta = &sdata->u.sta;
 180                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 181                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 182                             (unsigned long) sdata);
 183                 skb_queue_head_init(&ifsta->skb_queue);
 184
 185                 ifsta->capab = WLAN_CAPABILITY_ESS;
 186                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 187                         IEEE80211_AUTH_ALG_SHARED_KEY;
 188                 ifsta->create_ibss = 1;
 189                 ifsta->wmm_enabled = 1;
 190                 ifsta->auto_channel_sel = 1;
 191                 ifsta->auto_bssid_sel = 1;
 192
 193                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 194                 sdata->bss = &msdata->u.ap;
 195                 break;
 196         }
 197         case IEEE80211_IF_TYPE_MNTR:
 198                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 199                 break;
 200         default:
 201                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 202                        dev->name, __FUNCTION__, type);
 203         }
 204         ieee80211_debugfs_change_if_type(sdata, oldtype);
 205         ieee80211_update_default_wep_only(local);
 206 }
 207
 208 /* Must be called with rtnl lock held. */
 209 void ieee80211_if_reinit(struct net_device *dev)
 210 {
 211         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 212         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 213         struct sta_info *sta;
 214         int i;
 215
 216         ASSERT_RTNL();
 217         ieee80211_if_sdata_deinit(sdata);
 218         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 219                 if (!sdata->keys[i])
 220                         continue;
 221 #if 0
 222                 /* The interface is down at the moment, so there is not
 223                  * really much point in disabling the keys at this point. */
 224                 memset(addr, 0xff, ETH_ALEN);
 225                 if (local->ops->set_key)
 226                         local->ops->set_key(local_to_hw(local), DISABLE_KEY, addr,
 227                                             local->keys[i], 0);
 228 #endif
 229                 ieee80211_key_free(sdata->keys[i]);
 230                 sdata->keys[i] = NULL;
 231         }
 232
 233         switch (sdata->type) {
 234         case IEEE80211_IF_TYPE_AP: {
 235                 /* Remove all virtual interfaces that use this BSS
 236                  * as their sdata->bss */
 237                 struct ieee80211_sub_if_data *tsdata, *n;
 238                 LIST_HEAD(tmp_list);
 239
 240                 write_lock_bh(&local->sub_if_lock);
 241                 list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
 242                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 243                                 printk(KERN_DEBUG "%s: removing virtual "
 244                                        "interface %s because its BSS interface"
 245                                        " is being removed\n",
 246                                        sdata->dev->name, tsdata->dev->name);
 247                                 list_move_tail(&tsdata->list, &tmp_list);
 248                         }
 249                 }
 250                 write_unlock_bh(&local->sub_if_lock);
 251
 252                 list_for_each_entry_safe(tsdata, n, &tmp_list, list)
 253                         __ieee80211_if_del(local, tsdata);
 254
 255                 kfree(sdata->u.ap.beacon_head);
 256                 kfree(sdata->u.ap.beacon_tail);
 257                 kfree(sdata->u.ap.generic_elem);
 258
 259                 if (dev != local->mdev) {
 260                         struct sk_buff *skb;
 261                         while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 262                                 local->total_ps_buffered--;
 263                                 dev_kfree_skb(skb);
 264                         }
 265                 }
 266
 267                 break;
 268         }
 269         case IEEE80211_IF_TYPE_WDS:
 270                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 271                 if (sta) {
 272                         sta_info_put(sta);
 273                         sta_info_free(sta, 0);
 274                 } else {
 275 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 276                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 277                                "entry for the WDS link\n", dev->name);
 278 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 279                 }
 280                 break;
 281         case IEEE80211_IF_TYPE_STA:
 282         case IEEE80211_IF_TYPE_IBSS:
 283                 kfree(sdata->u.sta.extra_ie);
 284                 sdata->u.sta.extra_ie = NULL;
 285                 kfree(sdata->u.sta.assocreq_ies);
 286                 sdata->u.sta.assocreq_ies = NULL;
 287                 kfree(sdata->u.sta.assocresp_ies);
 288                 sdata->u.sta.assocresp_ies = NULL;
 289                 if (sdata->u.sta.probe_resp) {
 290                         dev_kfree_skb(sdata->u.sta.probe_resp);
 291                         sdata->u.sta.probe_resp = NULL;
 292                 }
 293
 294                 break;
 295         case IEEE80211_IF_TYPE_MNTR:
 296                 dev->type = ARPHRD_ETHER;
 297                 break;
 298         }
 299
 300         /* remove all STAs that are bound to this virtual interface */
 301         sta_info_flush(local, dev);
 302
 303         memset(&sdata->u, 0, sizeof(sdata->u));
 304         ieee80211_if_sdata_init(sdata);
 305 }
 306
 307 /* Must be called with rtnl lock held. */
 308 void __ieee80211_if_del(struct ieee80211_local *local,
 309                         struct ieee80211_sub_if_data *sdata)
 310 {
 311         struct net_device *dev = sdata->dev;
 312
 313         ieee80211_debugfs_remove_netdev(sdata);
 314         unregister_netdevice(dev);
 315         /* Except master interface, the net_device will be freed by
 316          * net_device->destructor (i. e. ieee80211_if_free). */
 317 }
 318
 319 /* Must be called with rtnl lock held. */
 320 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 321 {
 322         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 323         struct ieee80211_sub_if_data *sdata, *n;
 324
 325         ASSERT_RTNL();
 326
 327         write_lock_bh(&local->sub_if_lock);
 328         list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
 329                 if ((sdata->type == id || id == -1) &&
 330                     strcmp(name, sdata->dev->name) == 0 &&
 331                     sdata->dev != local->mdev) {
 332                         list_del(&sdata->list);
 333                         write_unlock_bh(&local->sub_if_lock);
 334                         __ieee80211_if_del(local, sdata);
 335                         ieee80211_update_default_wep_only(local);
 336                         return 0;
 337                 }
 338         }
 339         write_unlock_bh(&local->sub_if_lock);
 340         return -ENODEV;
 341 }
 342
 343 void ieee80211_if_free(struct net_device *dev)
 344 {
 345         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 346         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 347
 348         /* local->apdev must be NULL when freeing management interface */
 349         BUG_ON(dev == local->apdev);
 350         ieee80211_if_sdata_deinit(sdata);
 351         free_netdev(dev);
 352 }