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         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  26                 skb_queue_head_init(&sdata->fragments[i].skb_list);
  27
  28         INIT_LIST_HEAD(&sdata->key_list);
  29 }
  30
  31 static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
  32 {
  33         int i;
  34
  35         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
  36                 __skb_queue_purge(&sdata->fragments[i].skb_list);
  37         }
  38 }
  39
  40 /* Must be called with rtnl lock held. */
  41 int ieee80211_if_add(struct net_device *dev, const char *name,
  42                      struct net_device **new_dev, int type)
  43 {
  44         struct net_device *ndev;
  45         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  46         struct ieee80211_sub_if_data *sdata = NULL;
  47         int ret;
  48
  49         ASSERT_RTNL();
  50         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
  51                             name, ieee80211_if_setup);
  52         if (!ndev)
  53                 return -ENOMEM;
  54
  55         ret = dev_alloc_name(ndev, ndev->name);
  56         if (ret < 0)
  57                 goto fail;
  58
  59         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  60         ndev->base_addr = dev->base_addr;
  61         ndev->irq = dev->irq;
  62         ndev->mem_start = dev->mem_start;
  63         ndev->mem_end = dev->mem_end;
  64         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  65
  66         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
  67         ndev->ieee80211_ptr = &sdata->wdev;
  68         sdata->wdev.wiphy = local->hw.wiphy;
  69         sdata->vif.type = IEEE80211_IF_TYPE_AP;
  70         sdata->dev = ndev;
  71         sdata->local = local;
  72         ieee80211_if_sdata_init(sdata);
  73
  74         ret = register_netdevice(ndev);
  75         if (ret)
  76                 goto fail;
  77
  78         ieee80211_debugfs_add_netdev(sdata);
  79         ieee80211_if_set_type(ndev, type);
  80
  81         /* we're under RTNL so all this is fine */
  82         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
  83                 __ieee80211_if_del(local, sdata);
  84                 return -ENODEV;
  85         }
  86         list_add_tail_rcu(&sdata->list, &local->interfaces);
  87
  88         if (new_dev)
  89                 *new_dev = ndev;
  90
  91         return 0;
  92
  93 fail:
  94         free_netdev(ndev);
  95         return ret;
  96 }
  97
  98 void ieee80211_if_set_type(struct net_device *dev, int type)
  99 {
 100         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 101         int oldtype = sdata->vif.type;
 102
 103         /*
 104          * We need to call this function on the master interface
 105          * which already has a hard_start_xmit routine assigned
 106          * which must not be changed.
 107          */
 108         if (dev != sdata->local->mdev)
 109                 dev->hard_start_xmit = ieee80211_subif_start_xmit;
 110
 111         /*
 112          * Called even when register_netdevice fails, it would
 113          * oops if assigned before initialising the rest.
 114          */
 115         dev->uninit = ieee80211_if_reinit;
 116
 117         /* most have no BSS pointer */
 118         sdata->bss = NULL;
 119         sdata->vif.type = type;
 120
 121         sdata->basic_rates = 0;
 122
 123         switch (type) {
 124         case IEEE80211_IF_TYPE_WDS:
 125                 /* nothing special */
 126                 break;
 127         case IEEE80211_IF_TYPE_VLAN:
 128                 sdata->u.vlan.ap = NULL;
 129                 break;
 130         case IEEE80211_IF_TYPE_AP:
 131                 sdata->u.ap.force_unicast_rateidx = -1;
 132                 sdata->u.ap.max_ratectrl_rateidx = -1;
 133                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 134                 sdata->bss = &sdata->u.ap;
 135                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 136                 break;
 137         case IEEE80211_IF_TYPE_STA:
 138         case IEEE80211_IF_TYPE_IBSS: {
 139                 struct ieee80211_sub_if_data *msdata;
 140                 struct ieee80211_if_sta *ifsta;
 141
 142                 ifsta = &sdata->u.sta;
 143                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 144                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 145                             (unsigned long) sdata);
 146                 skb_queue_head_init(&ifsta->skb_queue);
 147
 148                 ifsta->capab = WLAN_CAPABILITY_ESS;
 149                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 150                         IEEE80211_AUTH_ALG_SHARED_KEY;
 151                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
 152                         IEEE80211_STA_WMM_ENABLED |
 153                         IEEE80211_STA_AUTO_BSSID_SEL |
 154                         IEEE80211_STA_AUTO_CHANNEL_SEL;
 155
 156                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 157                 sdata->bss = &msdata->u.ap;
 158                 break;
 159         }
 160         case IEEE80211_IF_TYPE_MNTR:
 161                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 162                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 163                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 164                                       MONITOR_FLAG_OTHER_BSS;
 165                 break;
 166         default:
 167                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 168                        dev->name, __func__, type);
 169         }
 170         ieee80211_debugfs_change_if_type(sdata, oldtype);
 171 }
 172
 173 /* Must be called with rtnl lock held. */
 174 void ieee80211_if_reinit(struct net_device *dev)
 175 {
 176         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 177         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 178         struct sta_info *sta;
 179         struct sk_buff *skb;
 180
 181         ASSERT_RTNL();
 182
 183         ieee80211_free_keys(sdata);
 184
 185         ieee80211_if_sdata_deinit(sdata);
 186
 187         switch (sdata->vif.type) {
 188         case IEEE80211_IF_TYPE_INVALID:
 189                 /* cannot happen */
 190                 WARN_ON(1);
 191                 break;
 192         case IEEE80211_IF_TYPE_AP: {
 193                 /* Remove all virtual interfaces that use this BSS
 194                  * as their sdata->bss */
 195                 struct ieee80211_sub_if_data *tsdata, *n;
 196                 struct beacon_data *beacon;
 197
 198                 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
 199                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 200                                 printk(KERN_DEBUG "%s: removing virtual "
 201                                        "interface %s because its BSS interface"
 202                                        " is being removed\n",
 203                                        sdata->dev->name, tsdata->dev->name);
 204                                 list_del_rcu(&tsdata->list);
 205                                 /*
 206                                  * We have lots of time and can afford
 207                                  * to sync for each interface
 208                                  */
 209                                 synchronize_rcu();
 210                                 __ieee80211_if_del(local, tsdata);
 211                         }
 212                 }
 213
 214                 beacon = sdata->u.ap.beacon;
 215                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 216                 synchronize_rcu();
 217                 kfree(beacon);
 218
 219                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 220                         local->total_ps_buffered--;
 221                         dev_kfree_skb(skb);
 222                 }
 223
 224                 break;
 225         }
 226         case IEEE80211_IF_TYPE_WDS:
 227                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 228                 if (sta) {
 229                         sta_info_free(sta);
 230                         sta_info_put(sta);
 231                 } else {
 232 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 233                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 234                                "entry for the WDS link\n", dev->name);
 235 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 236                 }
 237                 break;
 238         case IEEE80211_IF_TYPE_STA:
 239         case IEEE80211_IF_TYPE_IBSS:
 240                 kfree(sdata->u.sta.extra_ie);
 241                 sdata->u.sta.extra_ie = NULL;
 242                 kfree(sdata->u.sta.assocreq_ies);
 243                 sdata->u.sta.assocreq_ies = NULL;
 244                 kfree(sdata->u.sta.assocresp_ies);
 245                 sdata->u.sta.assocresp_ies = NULL;
 246                 if (sdata->u.sta.probe_resp) {
 247                         dev_kfree_skb(sdata->u.sta.probe_resp);
 248                         sdata->u.sta.probe_resp = NULL;
 249                 }
 250
 251                 break;
 252         case IEEE80211_IF_TYPE_MNTR:
 253                 dev->type = ARPHRD_ETHER;
 254                 break;
 255         case IEEE80211_IF_TYPE_VLAN:
 256                 sdata->u.vlan.ap = NULL;
 257                 break;
 258         }
 259
 260         /* remove all STAs that are bound to this virtual interface */
 261         sta_info_flush(local, dev);
 262
 263         memset(&sdata->u, 0, sizeof(sdata->u));
 264         ieee80211_if_sdata_init(sdata);
 265 }
 266
 267 /* Must be called with rtnl lock held. */
 268 void __ieee80211_if_del(struct ieee80211_local *local,
 269                         struct ieee80211_sub_if_data *sdata)
 270 {
 271         struct net_device *dev = sdata->dev;
 272
 273         ieee80211_debugfs_remove_netdev(sdata);
 274         unregister_netdevice(dev);
 275         /* Except master interface, the net_device will be freed by
 276          * net_device->destructor (i. e. ieee80211_if_free). */
 277 }
 278
 279 /* Must be called with rtnl lock held. */
 280 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 281 {
 282         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 283         struct ieee80211_sub_if_data *sdata, *n;
 284
 285         ASSERT_RTNL();
 286
 287         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
 288                 if ((sdata->vif.type == id || id == -1) &&
 289                     strcmp(name, sdata->dev->name) == 0 &&
 290                     sdata->dev != local->mdev) {
 291                         list_del_rcu(&sdata->list);
 292                         synchronize_rcu();
 293                         __ieee80211_if_del(local, sdata);
 294                         return 0;
 295                 }
 296         }
 297         return -ENODEV;
 298 }
 299
 300 void ieee80211_if_free(struct net_device *dev)
 301 {
 302         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 303
 304         ieee80211_if_sdata_deinit(sdata);
 305         free_netdev(dev);
 306 }