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(struct ieee80211_sub_if_data),
  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->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->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->type = type;
 120
 121         switch (type) {
 122         case IEEE80211_IF_TYPE_WDS:
 123                 /* nothing special */
 124                 break;
 125         case IEEE80211_IF_TYPE_VLAN:
 126                 sdata->u.vlan.ap = NULL;
 127                 break;
 128         case IEEE80211_IF_TYPE_AP:
 129                 sdata->u.ap.dtim_period = 2;
 130                 sdata->u.ap.force_unicast_rateidx = -1;
 131                 sdata->u.ap.max_ratectrl_rateidx = -1;
 132                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 133                 sdata->bss = &sdata->u.ap;
 134                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 135                 break;
 136         case IEEE80211_IF_TYPE_STA:
 137         case IEEE80211_IF_TYPE_IBSS: {
 138                 struct ieee80211_sub_if_data *msdata;
 139                 struct ieee80211_if_sta *ifsta;
 140
 141                 ifsta = &sdata->u.sta;
 142                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 143                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 144                             (unsigned long) sdata);
 145                 skb_queue_head_init(&ifsta->skb_queue);
 146
 147                 ifsta->capab = WLAN_CAPABILITY_ESS;
 148                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 149                         IEEE80211_AUTH_ALG_SHARED_KEY;
 150                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
 151                         IEEE80211_STA_WMM_ENABLED |
 152                         IEEE80211_STA_AUTO_BSSID_SEL |
 153                         IEEE80211_STA_AUTO_CHANNEL_SEL;
 154
 155                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 156                 sdata->bss = &msdata->u.ap;
 157                 break;
 158         }
 159         case IEEE80211_IF_TYPE_MNTR:
 160                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 161                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 162                 break;
 163         default:
 164                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 165                        dev->name, __FUNCTION__, type);
 166         }
 167         ieee80211_debugfs_change_if_type(sdata, oldtype);
 168 }
 169
 170 /* Must be called with rtnl lock held. */
 171 void ieee80211_if_reinit(struct net_device *dev)
 172 {
 173         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 174         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 175         struct sta_info *sta;
 176         struct sk_buff *skb;
 177
 178         ASSERT_RTNL();
 179
 180         ieee80211_free_keys(sdata);
 181
 182         ieee80211_if_sdata_deinit(sdata);
 183
 184         switch (sdata->type) {
 185         case IEEE80211_IF_TYPE_INVALID:
 186                 /* cannot happen */
 187                 WARN_ON(1);
 188                 break;
 189         case IEEE80211_IF_TYPE_AP: {
 190                 /* Remove all virtual interfaces that use this BSS
 191                  * as their sdata->bss */
 192                 struct ieee80211_sub_if_data *tsdata, *n;
 193
 194                 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
 195                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 196                                 printk(KERN_DEBUG "%s: removing virtual "
 197                                        "interface %s because its BSS interface"
 198                                        " is being removed\n",
 199                                        sdata->dev->name, tsdata->dev->name);
 200                                 list_del_rcu(&tsdata->list);
 201                                 /*
 202                                  * We have lots of time and can afford
 203                                  * to sync for each interface
 204                                  */
 205                                 synchronize_rcu();
 206                                 __ieee80211_if_del(local, tsdata);
 207                         }
 208                 }
 209
 210                 kfree(sdata->u.ap.beacon_head);
 211                 kfree(sdata->u.ap.beacon_tail);
 212
 213                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 214                         local->total_ps_buffered--;
 215                         dev_kfree_skb(skb);
 216                 }
 217
 218                 break;
 219         }
 220         case IEEE80211_IF_TYPE_WDS:
 221                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 222                 if (sta) {
 223                         sta_info_free(sta);
 224                         sta_info_put(sta);
 225                 } else {
 226 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 227                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 228                                "entry for the WDS link\n", dev->name);
 229 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 230                 }
 231                 break;
 232         case IEEE80211_IF_TYPE_STA:
 233         case IEEE80211_IF_TYPE_IBSS:
 234                 kfree(sdata->u.sta.extra_ie);
 235                 sdata->u.sta.extra_ie = NULL;
 236                 kfree(sdata->u.sta.assocreq_ies);
 237                 sdata->u.sta.assocreq_ies = NULL;
 238                 kfree(sdata->u.sta.assocresp_ies);
 239                 sdata->u.sta.assocresp_ies = NULL;
 240                 if (sdata->u.sta.probe_resp) {
 241                         dev_kfree_skb(sdata->u.sta.probe_resp);
 242                         sdata->u.sta.probe_resp = NULL;
 243                 }
 244
 245                 break;
 246         case IEEE80211_IF_TYPE_MNTR:
 247                 dev->type = ARPHRD_ETHER;
 248                 break;
 249         case IEEE80211_IF_TYPE_VLAN:
 250                 sdata->u.vlan.ap = NULL;
 251                 break;
 252         }
 253
 254         /* remove all STAs that are bound to this virtual interface */
 255         sta_info_flush(local, dev);
 256
 257         memset(&sdata->u, 0, sizeof(sdata->u));
 258         ieee80211_if_sdata_init(sdata);
 259 }
 260
 261 /* Must be called with rtnl lock held. */
 262 void __ieee80211_if_del(struct ieee80211_local *local,
 263                         struct ieee80211_sub_if_data *sdata)
 264 {
 265         struct net_device *dev = sdata->dev;
 266
 267         ieee80211_debugfs_remove_netdev(sdata);
 268         unregister_netdevice(dev);
 269         /* Except master interface, the net_device will be freed by
 270          * net_device->destructor (i. e. ieee80211_if_free). */
 271 }
 272
 273 /* Must be called with rtnl lock held. */
 274 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 275 {
 276         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 277         struct ieee80211_sub_if_data *sdata, *n;
 278
 279         ASSERT_RTNL();
 280
 281         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
 282                 if ((sdata->type == id || id == -1) &&
 283                     strcmp(name, sdata->dev->name) == 0 &&
 284                     sdata->dev != local->mdev) {
 285                         list_del_rcu(&sdata->list);
 286                         synchronize_rcu();
 287                         __ieee80211_if_del(local, sdata);
 288                         return 0;
 289                 }
 290         }
 291         return -ENODEV;
 292 }
 293
 294 void ieee80211_if_free(struct net_device *dev)
 295 {
 296         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 297
 298         ieee80211_if_sdata_deinit(sdata);
 299         free_netdev(dev);
 300 }