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         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 161
 162         sdata->type = type;
 163         switch (type) {
 164         case IEEE80211_IF_TYPE_WDS:
 165                 sdata->bss = NULL;
 166                 break;
 167         case IEEE80211_IF_TYPE_VLAN:
 168                 break;
 169         case IEEE80211_IF_TYPE_AP:
 170                 sdata->u.ap.dtim_period = 2;
 171                 sdata->u.ap.force_unicast_rateidx = -1;
 172                 sdata->u.ap.max_ratectrl_rateidx = -1;
 173                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 174                 sdata->bss = &sdata->u.ap;
 175                 break;
 176         case IEEE80211_IF_TYPE_STA:
 177         case IEEE80211_IF_TYPE_IBSS: {
 178                 struct ieee80211_sub_if_data *msdata;
 179                 struct ieee80211_if_sta *ifsta;
 180
 181                 ifsta = &sdata->u.sta;
 182                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 183                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 184                             (unsigned long) sdata);
 185                 skb_queue_head_init(&ifsta->skb_queue);
 186
 187                 ifsta->capab = WLAN_CAPABILITY_ESS;
 188                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 189                         IEEE80211_AUTH_ALG_SHARED_KEY;
 190                 ifsta->create_ibss = 1;
 191                 ifsta->wmm_enabled = 1;
 192                 ifsta->auto_channel_sel = 1;
 193                 ifsta->auto_bssid_sel = 1;
 194
 195                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 196                 sdata->bss = &msdata->u.ap;
 197                 break;
 198         }
 199         case IEEE80211_IF_TYPE_MNTR:
 200                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 201                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 202                 break;
 203         default:
 204                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 205                        dev->name, __FUNCTION__, type);
 206         }
 207         ieee80211_debugfs_change_if_type(sdata, oldtype);
 208         ieee80211_update_default_wep_only(local);
 209 }
 210
 211 /* Must be called with rtnl lock held. */
 212 void ieee80211_if_reinit(struct net_device *dev)
 213 {
 214         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 215         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 216         struct sta_info *sta;
 217         int i;
 218
 219         ASSERT_RTNL();
 220         ieee80211_if_sdata_deinit(sdata);
 221         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 222                 if (!sdata->keys[i])
 223                         continue;
 224 #if 0
 225                 /* The interface is down at the moment, so there is not
 226                  * really much point in disabling the keys at this point. */
 227                 memset(addr, 0xff, ETH_ALEN);
 228                 if (local->ops->set_key)
 229                         local->ops->set_key(local_to_hw(local), DISABLE_KEY, addr,
 230                                             local->keys[i], 0);
 231 #endif
 232                 ieee80211_key_free(sdata->keys[i]);
 233                 sdata->keys[i] = NULL;
 234         }
 235
 236         switch (sdata->type) {
 237         case IEEE80211_IF_TYPE_AP: {
 238                 /* Remove all virtual interfaces that use this BSS
 239                  * as their sdata->bss */
 240                 struct ieee80211_sub_if_data *tsdata, *n;
 241                 LIST_HEAD(tmp_list);
 242
 243                 write_lock_bh(&local->sub_if_lock);
 244                 list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
 245                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 246                                 printk(KERN_DEBUG "%s: removing virtual "
 247                                        "interface %s because its BSS interface"
 248                                        " is being removed\n",
 249                                        sdata->dev->name, tsdata->dev->name);
 250                                 list_move_tail(&tsdata->list, &tmp_list);
 251                         }
 252                 }
 253                 write_unlock_bh(&local->sub_if_lock);
 254
 255                 list_for_each_entry_safe(tsdata, n, &tmp_list, list)
 256                         __ieee80211_if_del(local, tsdata);
 257
 258                 kfree(sdata->u.ap.beacon_head);
 259                 kfree(sdata->u.ap.beacon_tail);
 260                 kfree(sdata->u.ap.generic_elem);
 261
 262                 if (dev != local->mdev) {
 263                         struct sk_buff *skb;
 264                         while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 265                                 local->total_ps_buffered--;
 266                                 dev_kfree_skb(skb);
 267                         }
 268                 }
 269
 270                 break;
 271         }
 272         case IEEE80211_IF_TYPE_WDS:
 273                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 274                 if (sta) {
 275                         sta_info_put(sta);
 276                         sta_info_free(sta, 0);
 277                 } else {
 278 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 279                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 280                                "entry for the WDS link\n", dev->name);
 281 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 282                 }
 283                 break;
 284         case IEEE80211_IF_TYPE_STA:
 285         case IEEE80211_IF_TYPE_IBSS:
 286                 kfree(sdata->u.sta.extra_ie);
 287                 sdata->u.sta.extra_ie = NULL;
 288                 kfree(sdata->u.sta.assocreq_ies);
 289                 sdata->u.sta.assocreq_ies = NULL;
 290                 kfree(sdata->u.sta.assocresp_ies);
 291                 sdata->u.sta.assocresp_ies = NULL;
 292                 if (sdata->u.sta.probe_resp) {
 293                         dev_kfree_skb(sdata->u.sta.probe_resp);
 294                         sdata->u.sta.probe_resp = NULL;
 295                 }
 296
 297                 break;
 298         case IEEE80211_IF_TYPE_MNTR:
 299                 dev->type = ARPHRD_ETHER;
 300                 break;
 301         }
 302
 303         /* remove all STAs that are bound to this virtual interface */
 304         sta_info_flush(local, dev);
 305
 306         memset(&sdata->u, 0, sizeof(sdata->u));
 307         ieee80211_if_sdata_init(sdata);
 308 }
 309
 310 /* Must be called with rtnl lock held. */
 311 void __ieee80211_if_del(struct ieee80211_local *local,
 312                         struct ieee80211_sub_if_data *sdata)
 313 {
 314         struct net_device *dev = sdata->dev;
 315
 316         ieee80211_debugfs_remove_netdev(sdata);
 317         unregister_netdevice(dev);
 318         /* Except master interface, the net_device will be freed by
 319          * net_device->destructor (i. e. ieee80211_if_free). */
 320 }
 321
 322 /* Must be called with rtnl lock held. */
 323 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 324 {
 325         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 326         struct ieee80211_sub_if_data *sdata, *n;
 327
 328         ASSERT_RTNL();
 329
 330         write_lock_bh(&local->sub_if_lock);
 331         list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
 332                 if ((sdata->type == id || id == -1) &&
 333                     strcmp(name, sdata->dev->name) == 0 &&
 334                     sdata->dev != local->mdev) {
 335                         list_del(&sdata->list);
 336                         write_unlock_bh(&local->sub_if_lock);
 337                         __ieee80211_if_del(local, sdata);
 338                         ieee80211_update_default_wep_only(local);
 339                         return 0;
 340                 }
 341         }
 342         write_unlock_bh(&local->sub_if_lock);
 343         return -ENODEV;
 344 }
 345
 346 void ieee80211_if_free(struct net_device *dev)
 347 {
 348         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 349         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 350
 351         /* local->apdev must be NULL when freeing management interface */
 352         BUG_ON(dev == local->apdev);
 353         ieee80211_if_sdata_deinit(sdata);
 354         free_netdev(dev);
 355 }