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
  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                      struct vif_params *params)
  45 {
  46         struct net_device *ndev;
  47         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  48         struct ieee80211_sub_if_data *sdata = NULL;
  49         int ret;
  50
  51         ASSERT_RTNL();
  52         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
  53                             name, ieee80211_if_setup);
  54         if (!ndev)
  55                 return -ENOMEM;
  56
  57         ret = dev_alloc_name(ndev, ndev->name);
  58         if (ret < 0)
  59                 goto fail;
  60
  61         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  62         ndev->base_addr = dev->base_addr;
  63         ndev->irq = dev->irq;
  64         ndev->mem_start = dev->mem_start;
  65         ndev->mem_end = dev->mem_end;
  66         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  67
  68         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
  69         ndev->ieee80211_ptr = &sdata->wdev;
  70         sdata->wdev.wiphy = local->hw.wiphy;
  71         sdata->vif.type = IEEE80211_IF_TYPE_AP;
  72         sdata->dev = ndev;
  73         sdata->local = local;
  74         ieee80211_if_sdata_init(sdata);
  75
  76         ret = register_netdevice(ndev);
  77         if (ret)
  78                 goto fail;
  79
  80         ieee80211_debugfs_add_netdev(sdata);
  81         ieee80211_if_set_type(ndev, type);
  82
  83         if (ieee80211_vif_is_mesh(&sdata->vif) &&
  84             params && params->mesh_id_len)
  85                 ieee80211_if_sta_set_mesh_id(&sdata->u.sta,
  86                                              params->mesh_id_len,
  87                                              params->mesh_id);
  88
  89         /* we're under RTNL so all this is fine */
  90         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
  91                 __ieee80211_if_del(local, sdata);
  92                 return -ENODEV;
  93         }
  94         list_add_tail_rcu(&sdata->list, &local->interfaces);
  95
  96         if (new_dev)
  97                 *new_dev = ndev;
  98
  99         return 0;
 100
 101 fail:
 102         free_netdev(ndev);
 103         return ret;
 104 }
 105
 106 void ieee80211_if_set_type(struct net_device *dev, int type)
 107 {
 108         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 109         int oldtype = sdata->vif.type;
 110
 111         /*
 112          * We need to call this function on the master interface
 113          * which already has a hard_start_xmit routine assigned
 114          * which must not be changed.
 115          */
 116         if (dev != sdata->local->mdev)
 117                 dev->hard_start_xmit = ieee80211_subif_start_xmit;
 118
 119         /*
 120          * Called even when register_netdevice fails, it would
 121          * oops if assigned before initialising the rest.
 122          */
 123         dev->uninit = ieee80211_if_reinit;
 124
 125         /* most have no BSS pointer */
 126         sdata->bss = NULL;
 127         sdata->vif.type = type;
 128
 129         sdata->basic_rates = 0;
 130
 131         switch (type) {
 132         case IEEE80211_IF_TYPE_WDS:
 133                 /* nothing special */
 134                 break;
 135         case IEEE80211_IF_TYPE_VLAN:
 136                 sdata->u.vlan.ap = NULL;
 137                 break;
 138         case IEEE80211_IF_TYPE_AP:
 139                 sdata->u.ap.force_unicast_rateidx = -1;
 140                 sdata->u.ap.max_ratectrl_rateidx = -1;
 141                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 142                 sdata->bss = &sdata->u.ap;
 143                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 144                 break;
 145         case IEEE80211_IF_TYPE_MESH_POINT:
 146         case IEEE80211_IF_TYPE_STA:
 147         case IEEE80211_IF_TYPE_IBSS: {
 148                 struct ieee80211_sub_if_data *msdata;
 149                 struct ieee80211_if_sta *ifsta;
 150
 151                 ifsta = &sdata->u.sta;
 152                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 153                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 154                             (unsigned long) sdata);
 155                 skb_queue_head_init(&ifsta->skb_queue);
 156
 157                 ifsta->capab = WLAN_CAPABILITY_ESS;
 158                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 159                         IEEE80211_AUTH_ALG_SHARED_KEY;
 160                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
 161                         IEEE80211_STA_WMM_ENABLED |
 162                         IEEE80211_STA_AUTO_BSSID_SEL |
 163                         IEEE80211_STA_AUTO_CHANNEL_SEL;
 164
 165                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 166                 sdata->bss = &msdata->u.ap;
 167
 168                 if (ieee80211_vif_is_mesh(&sdata->vif))
 169                         ieee80211_mesh_init_sdata(sdata);
 170                 break;
 171         }
 172         case IEEE80211_IF_TYPE_MNTR:
 173                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 174                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 175                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 176                                       MONITOR_FLAG_OTHER_BSS;
 177                 break;
 178         default:
 179                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 180                        dev->name, __func__, type);
 181         }
 182         ieee80211_debugfs_change_if_type(sdata, oldtype);
 183 }
 184
 185 /* Must be called with rtnl lock held. */
 186 void ieee80211_if_reinit(struct net_device *dev)
 187 {
 188         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 189         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 190         struct sk_buff *skb;
 191         int flushed;
 192
 193         ASSERT_RTNL();
 194
 195         ieee80211_free_keys(sdata);
 196
 197         ieee80211_if_sdata_deinit(sdata);
 198
 199         /* Need to handle mesh specially to allow eliding the function call */
 200         if (ieee80211_vif_is_mesh(&sdata->vif))
 201                 mesh_rmc_free(dev);
 202
 203         switch (sdata->vif.type) {
 204         case IEEE80211_IF_TYPE_INVALID:
 205                 /* cannot happen */
 206                 WARN_ON(1);
 207                 break;
 208         case IEEE80211_IF_TYPE_AP: {
 209                 /* Remove all virtual interfaces that use this BSS
 210                  * as their sdata->bss */
 211                 struct ieee80211_sub_if_data *tsdata, *n;
 212                 struct beacon_data *beacon;
 213
 214                 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
 215                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 216                                 printk(KERN_DEBUG "%s: removing virtual "
 217                                        "interface %s because its BSS interface"
 218                                        " is being removed\n",
 219                                        sdata->dev->name, tsdata->dev->name);
 220                                 list_del_rcu(&tsdata->list);
 221                                 /*
 222                                  * We have lots of time and can afford
 223                                  * to sync for each interface
 224                                  */
 225                                 synchronize_rcu();
 226                                 __ieee80211_if_del(local, tsdata);
 227                         }
 228                 }
 229
 230                 beacon = sdata->u.ap.beacon;
 231                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 232                 synchronize_rcu();
 233                 kfree(beacon);
 234
 235                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 236                         local->total_ps_buffered--;
 237                         dev_kfree_skb(skb);
 238                 }
 239
 240                 break;
 241         }
 242         case IEEE80211_IF_TYPE_WDS:
 243                 /* nothing to do */
 244                 break;
 245         case IEEE80211_IF_TYPE_MESH_POINT:
 246         case IEEE80211_IF_TYPE_STA:
 247         case IEEE80211_IF_TYPE_IBSS:
 248                 kfree(sdata->u.sta.extra_ie);
 249                 sdata->u.sta.extra_ie = NULL;
 250                 kfree(sdata->u.sta.assocreq_ies);
 251                 sdata->u.sta.assocreq_ies = NULL;
 252                 kfree(sdata->u.sta.assocresp_ies);
 253                 sdata->u.sta.assocresp_ies = NULL;
 254                 if (sdata->u.sta.probe_resp) {
 255                         dev_kfree_skb(sdata->u.sta.probe_resp);
 256                         sdata->u.sta.probe_resp = NULL;
 257                 }
 258
 259                 break;
 260         case IEEE80211_IF_TYPE_MNTR:
 261                 dev->type = ARPHRD_ETHER;
 262                 break;
 263         case IEEE80211_IF_TYPE_VLAN:
 264                 sdata->u.vlan.ap = NULL;
 265                 break;
 266         }
 267
 268         flushed = sta_info_flush(local, sdata);
 269         WARN_ON(flushed);
 270
 271         memset(&sdata->u, 0, sizeof(sdata->u));
 272         ieee80211_if_sdata_init(sdata);
 273 }
 274
 275 /* Must be called with rtnl lock held. */
 276 void __ieee80211_if_del(struct ieee80211_local *local,
 277                         struct ieee80211_sub_if_data *sdata)
 278 {
 279         struct net_device *dev = sdata->dev;
 280
 281         ieee80211_debugfs_remove_netdev(sdata);
 282         unregister_netdevice(dev);
 283         /* Except master interface, the net_device will be freed by
 284          * net_device->destructor (i. e. ieee80211_if_free). */
 285 }
 286
 287 /* Must be called with rtnl lock held. */
 288 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 289 {
 290         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 291         struct ieee80211_sub_if_data *sdata, *n;
 292
 293         ASSERT_RTNL();
 294
 295         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
 296                 if ((sdata->vif.type == id || id == -1) &&
 297                     strcmp(name, sdata->dev->name) == 0 &&
 298                     sdata->dev != local->mdev) {
 299                         list_del_rcu(&sdata->list);
 300                         synchronize_rcu();
 301                         __ieee80211_if_del(local, sdata);
 302                         return 0;
 303                 }
 304         }
 305         return -ENODEV;
 306 }
 307
 308 void ieee80211_if_free(struct net_device *dev)
 309 {
 310         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 311
 312         ieee80211_if_sdata_deinit(sdata);
 313         free_netdev(dev);
 314 }