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         INIT_LIST_HEAD(&sdata->key_list);
  30 }
  31
  32 static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
  33 {
  34         int i;
  35
  36         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
  37                 __skb_queue_purge(&sdata->fragments[i].skb_list);
  38         }
  39 }
  40
  41 /* Must be called with rtnl lock held. */
  42 int ieee80211_if_add(struct net_device *dev, const char *name,
  43                      struct net_device **new_dev, int type)
  44 {
  45         struct net_device *ndev;
  46         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  47         struct ieee80211_sub_if_data *sdata = NULL;
  48         int ret;
  49
  50         ASSERT_RTNL();
  51         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
  52                             name, ieee80211_if_setup);
  53         if (!ndev)
  54                 return -ENOMEM;
  55
  56         ret = dev_alloc_name(ndev, ndev->name);
  57         if (ret < 0)
  58                 goto fail;
  59
  60         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  61         ndev->base_addr = dev->base_addr;
  62         ndev->irq = dev->irq;
  63         ndev->mem_start = dev->mem_start;
  64         ndev->mem_end = dev->mem_end;
  65         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  66
  67         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
  68         ndev->ieee80211_ptr = &sdata->wdev;
  69         sdata->wdev.wiphy = local->hw.wiphy;
  70         sdata->type = IEEE80211_IF_TYPE_AP;
  71         sdata->dev = ndev;
  72         sdata->local = local;
  73         ieee80211_if_sdata_init(sdata);
  74
  75         ret = register_netdevice(ndev);
  76         if (ret)
  77                 goto fail;
  78
  79         ieee80211_debugfs_add_netdev(sdata);
  80         ieee80211_if_set_type(ndev, type);
  81
  82         /* we're under RTNL so all this is fine */
  83         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
  84                 __ieee80211_if_del(local, sdata);
  85                 return -ENODEV;
  86         }
  87         list_add_tail_rcu(&sdata->list, &local->interfaces);
  88
  89         if (new_dev)
  90                 *new_dev = ndev;
  91
  92         return 0;
  93
  94 fail:
  95         free_netdev(ndev);
  96         return ret;
  97 }
  98
  99 int ieee80211_if_add_mgmt(struct ieee80211_local *local)
 100 {
 101         struct net_device *ndev;
 102         struct ieee80211_sub_if_data *nsdata;
 103         int ret;
 104
 105         ASSERT_RTNL();
 106
 107         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "wmgmt%d",
 108                             ieee80211_if_mgmt_setup);
 109         if (!ndev)
 110                 return -ENOMEM;
 111         ret = dev_alloc_name(ndev, ndev->name);
 112         if (ret < 0)
 113                 goto fail;
 114
 115         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 116         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 117
 118         nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 119         ndev->ieee80211_ptr = &nsdata->wdev;
 120         nsdata->wdev.wiphy = local->hw.wiphy;
 121         nsdata->type = IEEE80211_IF_TYPE_MGMT;
 122         nsdata->dev = ndev;
 123         nsdata->local = local;
 124         ieee80211_if_sdata_init(nsdata);
 125
 126         ret = register_netdevice(ndev);
 127         if (ret)
 128                 goto fail;
 129
 130         ieee80211_debugfs_add_netdev(nsdata);
 131
 132         if (local->open_count > 0)
 133                 dev_open(ndev);
 134         local->apdev = ndev;
 135         return 0;
 136
 137 fail:
 138         free_netdev(ndev);
 139         return ret;
 140 }
 141
 142 void ieee80211_if_del_mgmt(struct ieee80211_local *local)
 143 {
 144         struct net_device *apdev;
 145
 146         ASSERT_RTNL();
 147         apdev = local->apdev;
 148         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(apdev));
 149         local->apdev = NULL;
 150         unregister_netdevice(apdev);
 151 }
 152
 153 void ieee80211_if_set_type(struct net_device *dev, int type)
 154 {
 155         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 156         int oldtype = sdata->type;
 157
 158         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 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                 sdata->u.vlan.ap = NULL;
 167                 break;
 168         case IEEE80211_IF_TYPE_AP:
 169                 sdata->u.ap.dtim_period = 2;
 170                 sdata->u.ap.force_unicast_rateidx = -1;
 171                 sdata->u.ap.max_ratectrl_rateidx = -1;
 172                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 173                 sdata->bss = &sdata->u.ap;
 174                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 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->flags |= IEEE80211_STA_CREATE_IBSS |
 191                         IEEE80211_STA_WMM_ENABLED |
 192                         IEEE80211_STA_AUTO_BSSID_SEL |
 193                         IEEE80211_STA_AUTO_CHANNEL_SEL;
 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 }
 209
 210 /* Must be called with rtnl lock held. */
 211 void ieee80211_if_reinit(struct net_device *dev)
 212 {
 213         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 214         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 215         struct sta_info *sta;
 216
 217         ASSERT_RTNL();
 218
 219         ieee80211_free_keys(sdata);
 220
 221         ieee80211_if_sdata_deinit(sdata);
 222
 223         switch (sdata->type) {
 224         case IEEE80211_IF_TYPE_AP: {
 225                 /* Remove all virtual interfaces that use this BSS
 226                  * as their sdata->bss */
 227                 struct ieee80211_sub_if_data *tsdata, *n;
 228
 229                 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
 230                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 231                                 printk(KERN_DEBUG "%s: removing virtual "
 232                                        "interface %s because its BSS interface"
 233                                        " is being removed\n",
 234                                        sdata->dev->name, tsdata->dev->name);
 235                                 list_del_rcu(&tsdata->list);
 236                                 /*
 237                                  * We have lots of time and can afford
 238                                  * to sync for each interface
 239                                  */
 240                                 synchronize_rcu();
 241                                 __ieee80211_if_del(local, tsdata);
 242                         }
 243                 }
 244
 245                 kfree(sdata->u.ap.beacon_head);
 246                 kfree(sdata->u.ap.beacon_tail);
 247                 kfree(sdata->u.ap.generic_elem);
 248
 249                 if (dev != local->mdev) {
 250                         struct sk_buff *skb;
 251                         while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 252                                 local->total_ps_buffered--;
 253                                 dev_kfree_skb(skb);
 254                         }
 255                 }
 256
 257                 break;
 258         }
 259         case IEEE80211_IF_TYPE_WDS:
 260                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 261                 if (sta) {
 262                         sta_info_free(sta);
 263                         sta_info_put(sta);
 264                 } else {
 265 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 266                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 267                                "entry for the WDS link\n", dev->name);
 268 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 269                 }
 270                 break;
 271         case IEEE80211_IF_TYPE_STA:
 272         case IEEE80211_IF_TYPE_IBSS:
 273                 kfree(sdata->u.sta.extra_ie);
 274                 sdata->u.sta.extra_ie = NULL;
 275                 kfree(sdata->u.sta.assocreq_ies);
 276                 sdata->u.sta.assocreq_ies = NULL;
 277                 kfree(sdata->u.sta.assocresp_ies);
 278                 sdata->u.sta.assocresp_ies = NULL;
 279                 if (sdata->u.sta.probe_resp) {
 280                         dev_kfree_skb(sdata->u.sta.probe_resp);
 281                         sdata->u.sta.probe_resp = NULL;
 282                 }
 283
 284                 break;
 285         case IEEE80211_IF_TYPE_MNTR:
 286                 dev->type = ARPHRD_ETHER;
 287                 break;
 288         case IEEE80211_IF_TYPE_VLAN:
 289                 sdata->u.vlan.ap = NULL;
 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         ieee80211_debugfs_remove_netdev(sdata);
 307         unregister_netdevice(dev);
 308         /* Except master interface, the net_device will be freed by
 309          * net_device->destructor (i. e. ieee80211_if_free). */
 310 }
 311
 312 /* Must be called with rtnl lock held. */
 313 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 314 {
 315         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 316         struct ieee80211_sub_if_data *sdata, *n;
 317
 318         ASSERT_RTNL();
 319
 320         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
 321                 if ((sdata->type == id || id == -1) &&
 322                     strcmp(name, sdata->dev->name) == 0 &&
 323                     sdata->dev != local->mdev) {
 324                         list_del_rcu(&sdata->list);
 325                         synchronize_rcu();
 326                         __ieee80211_if_del(local, sdata);
 327                         return 0;
 328                 }
 329         }
 330         return -ENODEV;
 331 }
 332
 333 void ieee80211_if_free(struct net_device *dev)
 334 {
 335         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 336         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 337
 338         /* local->apdev must be NULL when freeing management interface */
 339         BUG_ON(dev == local->apdev);
 340         ieee80211_if_sdata_deinit(sdata);
 341         free_netdev(dev);
 342 }