net/mac80211/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 #include "mesh.h"
  19
  20 void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
  21 {
  22         int i;
  23
  24         /* Default values for sub-interface parameters */
  25         sdata->drop_unencrypted = 0;
  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 /* 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                      struct vif_params *params)
  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(*sdata) + local->hw.vif_data_size,
  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->vif.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         if (ieee80211_vif_is_mesh(&sdata->vif) &&
  83             params && params->mesh_id_len)
  84                 ieee80211_if_sta_set_mesh_id(&sdata->u.sta,
  85                                              params->mesh_id_len,
  86                                              params->mesh_id);
  87
  88         /* we're under RTNL so all this is fine */
  89         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
  90                 __ieee80211_if_del(local, sdata);
  91                 return -ENODEV;
  92         }
  93         list_add_tail_rcu(&sdata->list, &local->interfaces);
  94
  95         if (new_dev)
  96                 *new_dev = ndev;
  97
  98         return 0;
  99
 100 fail:
 101         free_netdev(ndev);
 102         return ret;
 103 }
 104
 105 void ieee80211_if_set_type(struct net_device *dev, int type)
 106 {
 107         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 108         int oldtype = sdata->vif.type;
 109
 110         /*
 111          * We need to call this function on the master interface
 112          * which already has a hard_start_xmit routine assigned
 113          * which must not be changed.
 114          */
 115         if (dev != sdata->local->mdev)
 116                 dev->hard_start_xmit = ieee80211_subif_start_xmit;
 117
 118         /*
 119          * Called even when register_netdevice fails, it would
 120          * oops if assigned before initialising the rest.
 121          */
 122         dev->uninit = ieee80211_if_reinit;
 123
 124         /* most have no BSS pointer */
 125         sdata->bss = NULL;
 126         sdata->vif.type = type;
 127
 128         sdata->basic_rates = 0;
 129
 130         switch (type) {
 131         case IEEE80211_IF_TYPE_WDS:
 132                 /* nothing special */
 133                 break;
 134         case IEEE80211_IF_TYPE_VLAN:
 135                 sdata->u.vlan.ap = NULL;
 136                 break;
 137         case IEEE80211_IF_TYPE_AP:
 138                 sdata->u.ap.force_unicast_rateidx = -1;
 139                 sdata->u.ap.max_ratectrl_rateidx = -1;
 140                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 141                 sdata->bss = &sdata->u.ap;
 142                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 143                 break;
 144         case IEEE80211_IF_TYPE_MESH_POINT:
 145         case IEEE80211_IF_TYPE_STA:
 146         case IEEE80211_IF_TYPE_IBSS: {
 147                 struct ieee80211_sub_if_data *msdata;
 148                 struct ieee80211_if_sta *ifsta;
 149
 150                 ifsta = &sdata->u.sta;
 151                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 152                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 153                             (unsigned long) sdata);
 154                 skb_queue_head_init(&ifsta->skb_queue);
 155
 156                 ifsta->capab = WLAN_CAPABILITY_ESS;
 157                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 158                         IEEE80211_AUTH_ALG_SHARED_KEY;
 159                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
 160                         IEEE80211_STA_WMM_ENABLED |
 161                         IEEE80211_STA_AUTO_BSSID_SEL |
 162                         IEEE80211_STA_AUTO_CHANNEL_SEL;
 163
 164                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 165                 sdata->bss = &msdata->u.ap;
 166
 167                 if (ieee80211_vif_is_mesh(&sdata->vif))
 168                         ieee80211_mesh_init_sdata(sdata);
 169                 break;
 170         }
 171         case IEEE80211_IF_TYPE_MNTR:
 172                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 173                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 174                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 175                                       MONITOR_FLAG_OTHER_BSS;
 176                 break;
 177         default:
 178                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 179                        dev->name, __func__, type);
 180         }
 181         ieee80211_debugfs_change_if_type(sdata, oldtype);
 182 }
 183
 184 /* Must be called with rtnl lock held. */
 185 void ieee80211_if_reinit(struct net_device *dev)
 186 {
 187         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 188         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 189         struct sk_buff *skb;
 190         int flushed;
 191
 192         ASSERT_RTNL();
 193
 194         ieee80211_free_keys(sdata);
 195
 196         ieee80211_if_sdata_deinit(sdata);
 197
 198         /* Need to handle mesh specially to allow eliding the function call */
 199         if (ieee80211_vif_is_mesh(&sdata->vif))
 200                 mesh_rmc_free(dev);
 201
 202         switch (sdata->vif.type) {
 203         case IEEE80211_IF_TYPE_INVALID:
 204                 /* cannot happen */
 205                 WARN_ON(1);
 206                 break;
 207         case IEEE80211_IF_TYPE_AP: {
 208                 /* Remove all virtual interfaces that use this BSS
 209                  * as their sdata->bss */
 210                 struct ieee80211_sub_if_data *tsdata, *n;
 211                 struct beacon_data *beacon;
 212
 213                 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
 214                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 215                                 printk(KERN_DEBUG "%s: removing virtual "
 216                                        "interface %s because its BSS interface"
 217                                        " is being removed\n",
 218                                        sdata->dev->name, tsdata->dev->name);
 219                                 list_del_rcu(&tsdata->list);
 220                                 /*
 221                                  * We have lots of time and can afford
 222                                  * to sync for each interface
 223                                  */
 224                                 synchronize_rcu();
 225                                 __ieee80211_if_del(local, tsdata);
 226                         }
 227                 }
 228
 229                 beacon = sdata->u.ap.beacon;
 230                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 231                 synchronize_rcu();
 232                 kfree(beacon);
 233
 234                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 235                         local->total_ps_buffered--;
 236                         dev_kfree_skb(skb);
 237                 }
 238
 239                 break;
 240         }
 241         case IEEE80211_IF_TYPE_WDS:
 242                 /* nothing to do */
 243                 break;
 244         case IEEE80211_IF_TYPE_MESH_POINT:
 245         case IEEE80211_IF_TYPE_STA:
 246         case IEEE80211_IF_TYPE_IBSS:
 247                 kfree(sdata->u.sta.extra_ie);
 248                 sdata->u.sta.extra_ie = NULL;
 249                 kfree(sdata->u.sta.assocreq_ies);
 250                 sdata->u.sta.assocreq_ies = NULL;
 251                 kfree(sdata->u.sta.assocresp_ies);
 252                 sdata->u.sta.assocresp_ies = NULL;
 253                 if (sdata->u.sta.probe_resp) {
 254                         dev_kfree_skb(sdata->u.sta.probe_resp);
 255                         sdata->u.sta.probe_resp = NULL;
 256                 }
 257
 258                 break;
 259         case IEEE80211_IF_TYPE_MNTR:
 260                 dev->type = ARPHRD_ETHER;
 261                 break;
 262         case IEEE80211_IF_TYPE_VLAN:
 263                 sdata->u.vlan.ap = NULL;
 264                 break;
 265         }
 266
 267         flushed = sta_info_flush(local, sdata);
 268         WARN_ON(flushed);
 269
 270         memset(&sdata->u, 0, sizeof(sdata->u));
 271         ieee80211_if_sdata_init(sdata);
 272 }
 273
 274 /* Must be called with rtnl lock held. */
 275 void __ieee80211_if_del(struct ieee80211_local *local,
 276                         struct ieee80211_sub_if_data *sdata)
 277 {
 278         struct net_device *dev = sdata->dev;
 279
 280         ieee80211_debugfs_remove_netdev(sdata);
 281         unregister_netdevice(dev);
 282         /* Except master interface, the net_device will be freed by
 283          * net_device->destructor (i. e. ieee80211_if_free). */
 284 }
 285
 286 /* Must be called with rtnl lock held. */
 287 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 288 {
 289         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 290         struct ieee80211_sub_if_data *sdata, *n;
 291
 292         ASSERT_RTNL();
 293
 294         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
 295                 if ((sdata->vif.type == id || id == -1) &&
 296                     strcmp(name, sdata->dev->name) == 0 &&
 297                     sdata->dev != local->mdev) {
 298                         list_del_rcu(&sdata->list);
 299                         synchronize_rcu();
 300                         __ieee80211_if_del(local, sdata);
 301                         return 0;
 302                 }
 303         }
 304         return -ENODEV;
 305 }
 306
 307 void ieee80211_if_free(struct net_device *dev)
 308 {
 309         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 310
 311         ieee80211_if_sdata_deinit(sdata);
 312         free_netdev(dev);
 313 }