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 void ieee80211_if_set_type(struct net_device *dev, int type)
 100 {
 101         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 102         int oldtype = sdata->type;
 103
 104         /*
 105          * We need to call this function on the master interface
 106          * which already has a hard_start_xmit routine assigned
 107          * which must not be changed.
 108          */
 109         if (dev != sdata->local->mdev)
 110                 dev->hard_start_xmit = ieee80211_subif_start_xmit;
 111
 112         /*
 113          * Called even when register_netdevice fails, it would
 114          * oops if assigned before initialising the rest.
 115          */
 116         dev->uninit = ieee80211_if_reinit;
 117
 118         /* most have no BSS pointer */
 119         sdata->bss = NULL;
 120         sdata->type = type;
 121
 122         switch (type) {
 123         case IEEE80211_IF_TYPE_WDS:
 124                 /* nothing special */
 125                 break;
 126         case IEEE80211_IF_TYPE_VLAN:
 127                 sdata->u.vlan.ap = NULL;
 128                 break;
 129         case IEEE80211_IF_TYPE_AP:
 130                 sdata->u.ap.dtim_period = 2;
 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                 break;
 164         default:
 165                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 166                        dev->name, __FUNCTION__, type);
 167         }
 168         ieee80211_debugfs_change_if_type(sdata, oldtype);
 169 }
 170
 171 /* Must be called with rtnl lock held. */
 172 void ieee80211_if_reinit(struct net_device *dev)
 173 {
 174         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 175         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 176         struct sta_info *sta;
 177         struct sk_buff *skb;
 178
 179         ASSERT_RTNL();
 180
 181         ieee80211_free_keys(sdata);
 182
 183         ieee80211_if_sdata_deinit(sdata);
 184
 185         switch (sdata->type) {
 186         case IEEE80211_IF_TYPE_INVALID:
 187                 /* cannot happen */
 188                 WARN_ON(1);
 189                 break;
 190         case IEEE80211_IF_TYPE_AP: {
 191                 /* Remove all virtual interfaces that use this BSS
 192                  * as their sdata->bss */
 193                 struct ieee80211_sub_if_data *tsdata, *n;
 194
 195                 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
 196                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 197                                 printk(KERN_DEBUG "%s: removing virtual "
 198                                        "interface %s because its BSS interface"
 199                                        " is being removed\n",
 200                                        sdata->dev->name, tsdata->dev->name);
 201                                 list_del_rcu(&tsdata->list);
 202                                 /*
 203                                  * We have lots of time and can afford
 204                                  * to sync for each interface
 205                                  */
 206                                 synchronize_rcu();
 207                                 __ieee80211_if_del(local, tsdata);
 208                         }
 209                 }
 210
 211                 kfree(sdata->u.ap.beacon_head);
 212                 kfree(sdata->u.ap.beacon_tail);
 213
 214                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 215                         local->total_ps_buffered--;
 216                         dev_kfree_skb(skb);
 217                 }
 218
 219                 break;
 220         }
 221         case IEEE80211_IF_TYPE_WDS:
 222                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 223                 if (sta) {
 224                         sta_info_free(sta);
 225                         sta_info_put(sta);
 226                 } else {
 227 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 228                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 229                                "entry for the WDS link\n", dev->name);
 230 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 231                 }
 232                 break;
 233         case IEEE80211_IF_TYPE_STA:
 234         case IEEE80211_IF_TYPE_IBSS:
 235                 kfree(sdata->u.sta.extra_ie);
 236                 sdata->u.sta.extra_ie = NULL;
 237                 kfree(sdata->u.sta.assocreq_ies);
 238                 sdata->u.sta.assocreq_ies = NULL;
 239                 kfree(sdata->u.sta.assocresp_ies);
 240                 sdata->u.sta.assocresp_ies = NULL;
 241                 if (sdata->u.sta.probe_resp) {
 242                         dev_kfree_skb(sdata->u.sta.probe_resp);
 243                         sdata->u.sta.probe_resp = NULL;
 244                 }
 245
 246                 break;
 247         case IEEE80211_IF_TYPE_MNTR:
 248                 dev->type = ARPHRD_ETHER;
 249                 break;
 250         case IEEE80211_IF_TYPE_VLAN:
 251                 sdata->u.vlan.ap = NULL;
 252                 break;
 253         }
 254
 255         /* remove all STAs that are bound to this virtual interface */
 256         sta_info_flush(local, dev);
 257
 258         memset(&sdata->u, 0, sizeof(sdata->u));
 259         ieee80211_if_sdata_init(sdata);
 260 }
 261
 262 /* Must be called with rtnl lock held. */
 263 void __ieee80211_if_del(struct ieee80211_local *local,
 264                         struct ieee80211_sub_if_data *sdata)
 265 {
 266         struct net_device *dev = sdata->dev;
 267
 268         ieee80211_debugfs_remove_netdev(sdata);
 269         unregister_netdevice(dev);
 270         /* Except master interface, the net_device will be freed by
 271          * net_device->destructor (i. e. ieee80211_if_free). */
 272 }
 273
 274 /* Must be called with rtnl lock held. */
 275 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 276 {
 277         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 278         struct ieee80211_sub_if_data *sdata, *n;
 279
 280         ASSERT_RTNL();
 281
 282         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
 283                 if ((sdata->type == id || id == -1) &&
 284                     strcmp(name, sdata->dev->name) == 0 &&
 285                     sdata->dev != local->mdev) {
 286                         list_del_rcu(&sdata->list);
 287                         synchronize_rcu();
 288                         __ieee80211_if_del(local, sdata);
 289                         return 0;
 290                 }
 291         }
 292         return -ENODEV;
 293 }
 294
 295 void ieee80211_if_free(struct net_device *dev)
 296 {
 297         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 298
 299         ieee80211_if_sdata_deinit(sdata);
 300         free_netdev(dev);
 301 }