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         /*
 131          * Called even when register_netdevice fails, it would
 132          * oops if assigned before initialising the rest.
 133          */
 134         ndev->uninit = ieee80211_if_reinit;
 135
 136         ieee80211_debugfs_add_netdev(nsdata);
 137
 138         if (local->open_count > 0)
 139                 dev_open(ndev);
 140         local->apdev = ndev;
 141         return 0;
 142
 143 fail:
 144         free_netdev(ndev);
 145         return ret;
 146 }
 147
 148 void ieee80211_if_del_mgmt(struct ieee80211_local *local)
 149 {
 150         struct net_device *apdev;
 151
 152         ASSERT_RTNL();
 153         apdev = local->apdev;
 154         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(apdev));
 155         local->apdev = NULL;
 156         unregister_netdevice(apdev);
 157 }
 158
 159 void ieee80211_if_set_type(struct net_device *dev, int type)
 160 {
 161         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 162         int oldtype = sdata->type;
 163
 164         /*
 165          * We need to call this function on the master interface
 166          * which already has a hard_start_xmit routine assigned
 167          * which must not be changed.
 168          */
 169         if (!dev->hard_start_xmit)
 170                 dev->hard_start_xmit = ieee80211_subif_start_xmit;
 171
 172         /*
 173          * Called even when register_netdevice fails, it would
 174          * oops if assigned before initialising the rest.
 175          */
 176         dev->uninit = ieee80211_if_reinit;
 177
 178         /* most have no BSS pointer */
 179         sdata->bss = NULL;
 180         sdata->type = type;
 181
 182         switch (type) {
 183         case IEEE80211_IF_TYPE_WDS:
 184                 /* nothing special */
 185                 break;
 186         case IEEE80211_IF_TYPE_VLAN:
 187                 sdata->u.vlan.ap = NULL;
 188                 break;
 189         case IEEE80211_IF_TYPE_AP:
 190                 sdata->u.ap.dtim_period = 2;
 191                 sdata->u.ap.force_unicast_rateidx = -1;
 192                 sdata->u.ap.max_ratectrl_rateidx = -1;
 193                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 194                 sdata->bss = &sdata->u.ap;
 195                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 196                 break;
 197         case IEEE80211_IF_TYPE_STA:
 198         case IEEE80211_IF_TYPE_IBSS: {
 199                 struct ieee80211_sub_if_data *msdata;
 200                 struct ieee80211_if_sta *ifsta;
 201
 202                 ifsta = &sdata->u.sta;
 203                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 204                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 205                             (unsigned long) sdata);
 206                 skb_queue_head_init(&ifsta->skb_queue);
 207
 208                 ifsta->capab = WLAN_CAPABILITY_ESS;
 209                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 210                         IEEE80211_AUTH_ALG_SHARED_KEY;
 211                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
 212                         IEEE80211_STA_WMM_ENABLED |
 213                         IEEE80211_STA_AUTO_BSSID_SEL |
 214                         IEEE80211_STA_AUTO_CHANNEL_SEL;
 215
 216                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 217                 sdata->bss = &msdata->u.ap;
 218                 break;
 219         }
 220         case IEEE80211_IF_TYPE_MNTR:
 221                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 222                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 223                 break;
 224         default:
 225                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 226                        dev->name, __FUNCTION__, type);
 227         }
 228         ieee80211_debugfs_change_if_type(sdata, oldtype);
 229 }
 230
 231 /* Must be called with rtnl lock held. */
 232 void ieee80211_if_reinit(struct net_device *dev)
 233 {
 234         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 235         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 236         struct sta_info *sta;
 237         struct sk_buff *skb;
 238
 239         ASSERT_RTNL();
 240
 241         ieee80211_free_keys(sdata);
 242
 243         ieee80211_if_sdata_deinit(sdata);
 244
 245         switch (sdata->type) {
 246         case IEEE80211_IF_TYPE_AP: {
 247                 /* Remove all virtual interfaces that use this BSS
 248                  * as their sdata->bss */
 249                 struct ieee80211_sub_if_data *tsdata, *n;
 250
 251                 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
 252                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 253                                 printk(KERN_DEBUG "%s: removing virtual "
 254                                        "interface %s because its BSS interface"
 255                                        " is being removed\n",
 256                                        sdata->dev->name, tsdata->dev->name);
 257                                 list_del_rcu(&tsdata->list);
 258                                 /*
 259                                  * We have lots of time and can afford
 260                                  * to sync for each interface
 261                                  */
 262                                 synchronize_rcu();
 263                                 __ieee80211_if_del(local, tsdata);
 264                         }
 265                 }
 266
 267                 kfree(sdata->u.ap.beacon_head);
 268                 kfree(sdata->u.ap.beacon_tail);
 269                 kfree(sdata->u.ap.generic_elem);
 270
 271                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 272                         local->total_ps_buffered--;
 273                         dev_kfree_skb(skb);
 274                 }
 275
 276                 break;
 277         }
 278         case IEEE80211_IF_TYPE_WDS:
 279                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 280                 if (sta) {
 281                         sta_info_free(sta);
 282                         sta_info_put(sta);
 283                 } else {
 284 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 285                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 286                                "entry for the WDS link\n", dev->name);
 287 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 288                 }
 289                 break;
 290         case IEEE80211_IF_TYPE_STA:
 291         case IEEE80211_IF_TYPE_IBSS:
 292                 kfree(sdata->u.sta.extra_ie);
 293                 sdata->u.sta.extra_ie = NULL;
 294                 kfree(sdata->u.sta.assocreq_ies);
 295                 sdata->u.sta.assocreq_ies = NULL;
 296                 kfree(sdata->u.sta.assocresp_ies);
 297                 sdata->u.sta.assocresp_ies = NULL;
 298                 if (sdata->u.sta.probe_resp) {
 299                         dev_kfree_skb(sdata->u.sta.probe_resp);
 300                         sdata->u.sta.probe_resp = NULL;
 301                 }
 302
 303                 break;
 304         case IEEE80211_IF_TYPE_MNTR:
 305                 dev->type = ARPHRD_ETHER;
 306                 break;
 307         case IEEE80211_IF_TYPE_VLAN:
 308                 sdata->u.vlan.ap = NULL;
 309                 break;
 310         }
 311
 312         /* remove all STAs that are bound to this virtual interface */
 313         sta_info_flush(local, dev);
 314
 315         memset(&sdata->u, 0, sizeof(sdata->u));
 316         ieee80211_if_sdata_init(sdata);
 317 }
 318
 319 /* Must be called with rtnl lock held. */
 320 void __ieee80211_if_del(struct ieee80211_local *local,
 321                         struct ieee80211_sub_if_data *sdata)
 322 {
 323         struct net_device *dev = sdata->dev;
 324
 325         ieee80211_debugfs_remove_netdev(sdata);
 326         unregister_netdevice(dev);
 327         /* Except master interface, the net_device will be freed by
 328          * net_device->destructor (i. e. ieee80211_if_free). */
 329 }
 330
 331 /* Must be called with rtnl lock held. */
 332 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 333 {
 334         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 335         struct ieee80211_sub_if_data *sdata, *n;
 336
 337         ASSERT_RTNL();
 338
 339         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
 340                 if ((sdata->type == id || id == -1) &&
 341                     strcmp(name, sdata->dev->name) == 0 &&
 342                     sdata->dev != local->mdev) {
 343                         list_del_rcu(&sdata->list);
 344                         synchronize_rcu();
 345                         __ieee80211_if_del(local, sdata);
 346                         return 0;
 347                 }
 348         }
 349         return -ENODEV;
 350 }
 351
 352 void ieee80211_if_free(struct net_device *dev)
 353 {
 354         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 355         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 356
 357         /* local->apdev must be NULL when freeing management interface */
 358         BUG_ON(dev == local->apdev);
 359         ieee80211_if_sdata_deinit(sdata);
 360         free_netdev(dev);
 361 }