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         ndev->needed_headroom = local->tx_headroom +
  57                                 4*6 /* four MAC addresses */
  58                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
  59                                 + 6 /* mesh */
  60                                 + 8 /* rfc1042/bridge tunnel */
  61                                 - ETH_HLEN /* ethernet hard_header_len */
  62                                 + IEEE80211_ENCRYPT_HEADROOM;
  63         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
  64
  65         ret = dev_alloc_name(ndev, ndev->name);
  66         if (ret < 0)
  67                 goto fail;
  68
  69         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  70         ndev->base_addr = dev->base_addr;
  71         ndev->irq = dev->irq;
  72         ndev->mem_start = dev->mem_start;
  73         ndev->mem_end = dev->mem_end;
  74         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  75
  76         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
  77         ndev->ieee80211_ptr = &sdata->wdev;
  78         sdata->wdev.wiphy = local->hw.wiphy;
  79         sdata->vif.type = IEEE80211_IF_TYPE_AP;
  80         sdata->dev = ndev;
  81         sdata->local = local;
  82         ieee80211_if_sdata_init(sdata);
  83
  84         ret = register_netdevice(ndev);
  85         if (ret)
  86                 goto fail;
  87
  88         ieee80211_debugfs_add_netdev(sdata);
  89         ieee80211_if_set_type(ndev, type);
  90
  91         if (ieee80211_vif_is_mesh(&sdata->vif) &&
  92             params && params->mesh_id_len)
  93                 ieee80211_if_sta_set_mesh_id(&sdata->u.sta,
  94                                              params->mesh_id_len,
  95                                              params->mesh_id);
  96
  97         /* we're under RTNL so all this is fine */
  98         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
  99                 __ieee80211_if_del(local, sdata);
 100                 return -ENODEV;
 101         }
 102         list_add_tail_rcu(&sdata->list, &local->interfaces);
 103
 104         if (new_dev)
 105                 *new_dev = ndev;
 106
 107         return 0;
 108
 109 fail:
 110         free_netdev(ndev);
 111         return ret;
 112 }
 113
 114 void ieee80211_if_set_type(struct net_device *dev, int type)
 115 {
 116         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 117         int oldtype = sdata->vif.type;
 118
 119         /*
 120          * We need to call this function on the master interface
 121          * which already has a hard_start_xmit routine assigned
 122          * which must not be changed.
 123          */
 124         if (dev != sdata->local->mdev)
 125                 dev->hard_start_xmit = ieee80211_subif_start_xmit;
 126
 127         /*
 128          * Called even when register_netdevice fails, it would
 129          * oops if assigned before initialising the rest.
 130          */
 131         dev->uninit = ieee80211_if_reinit;
 132
 133         /* most have no BSS pointer */
 134         sdata->bss = NULL;
 135         sdata->vif.type = type;
 136
 137         sdata->basic_rates = 0;
 138
 139         switch (type) {
 140         case IEEE80211_IF_TYPE_WDS:
 141                 /* nothing special */
 142                 break;
 143         case IEEE80211_IF_TYPE_VLAN:
 144                 sdata->u.vlan.ap = NULL;
 145                 break;
 146         case IEEE80211_IF_TYPE_AP:
 147                 sdata->u.ap.force_unicast_rateidx = -1;
 148                 sdata->u.ap.max_ratectrl_rateidx = -1;
 149                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 150                 sdata->bss = &sdata->u.ap;
 151                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 152                 break;
 153         case IEEE80211_IF_TYPE_MESH_POINT:
 154         case IEEE80211_IF_TYPE_STA:
 155         case IEEE80211_IF_TYPE_IBSS: {
 156                 struct ieee80211_sub_if_data *msdata;
 157                 struct ieee80211_if_sta *ifsta;
 158
 159                 ifsta = &sdata->u.sta;
 160                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 161                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 162                             (unsigned long) sdata);
 163                 skb_queue_head_init(&ifsta->skb_queue);
 164
 165                 ifsta->capab = WLAN_CAPABILITY_ESS;
 166                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 167                         IEEE80211_AUTH_ALG_SHARED_KEY;
 168                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
 169                         IEEE80211_STA_WMM_ENABLED |
 170                         IEEE80211_STA_AUTO_BSSID_SEL |
 171                         IEEE80211_STA_AUTO_CHANNEL_SEL;
 172
 173                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 174                 sdata->bss = &msdata->u.ap;
 175
 176                 if (ieee80211_vif_is_mesh(&sdata->vif))
 177                         ieee80211_mesh_init_sdata(sdata);
 178                 break;
 179         }
 180         case IEEE80211_IF_TYPE_MNTR:
 181                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 182                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 183                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 184                                       MONITOR_FLAG_OTHER_BSS;
 185                 break;
 186         default:
 187                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 188                        dev->name, __func__, type);
 189         }
 190         ieee80211_debugfs_change_if_type(sdata, oldtype);
 191 }
 192
 193 /* Must be called with rtnl lock held. */
 194 void ieee80211_if_reinit(struct net_device *dev)
 195 {
 196         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 197         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 198         struct sk_buff *skb;
 199         int flushed;
 200
 201         ASSERT_RTNL();
 202
 203         ieee80211_free_keys(sdata);
 204
 205         ieee80211_if_sdata_deinit(sdata);
 206
 207         /* Need to handle mesh specially to allow eliding the function call */
 208         if (ieee80211_vif_is_mesh(&sdata->vif))
 209                 mesh_rmc_free(dev);
 210
 211         switch (sdata->vif.type) {
 212         case IEEE80211_IF_TYPE_INVALID:
 213                 /* cannot happen */
 214                 WARN_ON(1);
 215                 break;
 216         case IEEE80211_IF_TYPE_AP: {
 217                 /* Remove all virtual interfaces that use this BSS
 218                  * as their sdata->bss */
 219                 struct ieee80211_sub_if_data *tsdata, *n;
 220                 struct beacon_data *beacon;
 221
 222                 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
 223                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 224                                 printk(KERN_DEBUG "%s: removing virtual "
 225                                        "interface %s because its BSS interface"
 226                                        " is being removed\n",
 227                                        sdata->dev->name, tsdata->dev->name);
 228                                 list_del_rcu(&tsdata->list);
 229                                 /*
 230                                  * We have lots of time and can afford
 231                                  * to sync for each interface
 232                                  */
 233                                 synchronize_rcu();
 234                                 __ieee80211_if_del(local, tsdata);
 235                         }
 236                 }
 237
 238                 beacon = sdata->u.ap.beacon;
 239                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 240                 synchronize_rcu();
 241                 kfree(beacon);
 242
 243                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 244                         local->total_ps_buffered--;
 245                         dev_kfree_skb(skb);
 246                 }
 247
 248                 break;
 249         }
 250         case IEEE80211_IF_TYPE_WDS:
 251                 /* nothing to do */
 252                 break;
 253         case IEEE80211_IF_TYPE_MESH_POINT:
 254         case IEEE80211_IF_TYPE_STA:
 255         case IEEE80211_IF_TYPE_IBSS:
 256                 kfree(sdata->u.sta.extra_ie);
 257                 sdata->u.sta.extra_ie = NULL;
 258                 kfree(sdata->u.sta.assocreq_ies);
 259                 sdata->u.sta.assocreq_ies = NULL;
 260                 kfree(sdata->u.sta.assocresp_ies);
 261                 sdata->u.sta.assocresp_ies = NULL;
 262                 if (sdata->u.sta.probe_resp) {
 263                         dev_kfree_skb(sdata->u.sta.probe_resp);
 264                         sdata->u.sta.probe_resp = NULL;
 265                 }
 266
 267                 break;
 268         case IEEE80211_IF_TYPE_MNTR:
 269                 dev->type = ARPHRD_ETHER;
 270                 break;
 271         case IEEE80211_IF_TYPE_VLAN:
 272                 sdata->u.vlan.ap = NULL;
 273                 break;
 274         }
 275
 276         flushed = sta_info_flush(local, sdata);
 277         WARN_ON(flushed);
 278
 279         memset(&sdata->u, 0, sizeof(sdata->u));
 280         ieee80211_if_sdata_init(sdata);
 281 }
 282
 283 /* Must be called with rtnl lock held. */
 284 void __ieee80211_if_del(struct ieee80211_local *local,
 285                         struct ieee80211_sub_if_data *sdata)
 286 {
 287         struct net_device *dev = sdata->dev;
 288
 289         ieee80211_debugfs_remove_netdev(sdata);
 290         unregister_netdevice(dev);
 291         /* Except master interface, the net_device will be freed by
 292          * net_device->destructor (i. e. ieee80211_if_free). */
 293 }
 294
 295 /* Must be called with rtnl lock held. */
 296 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 297 {
 298         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 299         struct ieee80211_sub_if_data *sdata, *n;
 300
 301         ASSERT_RTNL();
 302
 303         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
 304                 if ((sdata->vif.type == id || id == -1) &&
 305                     strcmp(name, sdata->dev->name) == 0 &&
 306                     sdata->dev != local->mdev) {
 307                         list_del_rcu(&sdata->list);
 308                         synchronize_rcu();
 309                         __ieee80211_if_del(local, sdata);
 310                         return 0;
 311                 }
 312         }
 313         return -ENODEV;
 314 }
 315
 316 void ieee80211_if_free(struct net_device *dev)
 317 {
 318         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 319
 320         ieee80211_if_sdata_deinit(sdata);
 321         free_netdev(dev);
 322 }