SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         sdata->force_unicast_rateidx = -1;
  32         sdata->max_ratectrl_rateidx = -1;
  33 }
  34
  35 static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
  36 {
  37         int i;
  38
  39         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  40                 __skb_queue_purge(&sdata->fragments[i].skb_list);
  41 }
  42
  43 /* Must be called with rtnl lock held. */
  44 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
  45                      struct net_device **new_dev, int type,
  46                      struct vif_params *params)
  47 {
  48         struct net_device *ndev;
  49         struct ieee80211_sub_if_data *sdata = NULL;
  50         int ret;
  51
  52         ASSERT_RTNL();
  53         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
  54                             name, ieee80211_if_setup);
  55         if (!ndev)
  56                 return -ENOMEM;
  57
  58         ndev->needed_headroom = local->tx_headroom +
  59                                 4*6 /* four MAC addresses */
  60                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
  61                                 + 6 /* mesh */
  62                                 + 8 /* rfc1042/bridge tunnel */
  63                                 - ETH_HLEN /* ethernet hard_header_len */
  64                                 + IEEE80211_ENCRYPT_HEADROOM;
  65         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
  66
  67         ret = dev_alloc_name(ndev, ndev->name);
  68         if (ret < 0)
  69                 goto fail;
  70
  71         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  72         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  73
  74         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
  75         sdata = netdev_priv(ndev);
  76         ndev->ieee80211_ptr = &sdata->wdev;
  77         sdata->wdev.wiphy = local->hw.wiphy;
  78         sdata->vif.type = IEEE80211_IF_TYPE_AP;
  79         sdata->dev = ndev;
  80         sdata->local = local;
  81         ieee80211_if_sdata_init(sdata);
  82
  83         ret = register_netdevice(ndev);
  84         if (ret)
  85                 goto fail;
  86
  87         ieee80211_debugfs_add_netdev(sdata);
  88         ieee80211_if_set_type(ndev, type);
  89
  90         if (ieee80211_vif_is_mesh(&sdata->vif) &&
  91             params && params->mesh_id_len)
  92                 ieee80211_if_sta_set_mesh_id(&sdata->u.sta,
  93                                              params->mesh_id_len,
  94                                              params->mesh_id);
  95
  96         /* we're under RTNL so all this is fine */
  97         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
  98                 __ieee80211_if_del(local, sdata);
  99                 return -ENODEV;
 100         }
 101         list_add_tail_rcu(&sdata->list, &local->interfaces);
 102
 103         if (new_dev)
 104                 *new_dev = ndev;
 105
 106         return 0;
 107
 108 fail:
 109         free_netdev(ndev);
 110         return ret;
 111 }
 112
 113 void ieee80211_if_set_type(struct net_device *dev, int type)
 114 {
 115         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 116         int oldtype = sdata->vif.type;
 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         case IEEE80211_IF_TYPE_VLAN:
 133                 /* nothing special */
 134                 break;
 135         case IEEE80211_IF_TYPE_AP:
 136                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 137                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 138                 break;
 139         case IEEE80211_IF_TYPE_MESH_POINT:
 140         case IEEE80211_IF_TYPE_STA:
 141         case IEEE80211_IF_TYPE_IBSS: {
 142                 struct ieee80211_if_sta *ifsta;
 143
 144                 ifsta = &sdata->u.sta;
 145                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 146                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 147                             (unsigned long) sdata);
 148                 skb_queue_head_init(&ifsta->skb_queue);
 149
 150                 ifsta->capab = WLAN_CAPABILITY_ESS;
 151                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 152                         IEEE80211_AUTH_ALG_SHARED_KEY;
 153                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
 154                         IEEE80211_STA_AUTO_BSSID_SEL |
 155                         IEEE80211_STA_AUTO_CHANNEL_SEL;
 156                 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
 157                         ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
 158
 159                 if (ieee80211_vif_is_mesh(&sdata->vif))
 160                         ieee80211_mesh_init_sdata(sdata);
 161                 break;
 162         }
 163         case IEEE80211_IF_TYPE_MNTR:
 164                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 165                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 166                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 167                                       MONITOR_FLAG_OTHER_BSS;
 168                 break;
 169         case IEEE80211_IF_TYPE_INVALID:
 170                 BUG();
 171                 break;
 172         }
 173         ieee80211_debugfs_change_if_type(sdata, oldtype);
 174 }
 175
 176 /* Must be called with rtnl lock held. */
 177 void ieee80211_if_reinit(struct net_device *dev)
 178 {
 179         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 180         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 181         struct sk_buff *skb;
 182         int flushed;
 183
 184         ASSERT_RTNL();
 185
 186         ieee80211_free_keys(sdata);
 187
 188         ieee80211_if_sdata_deinit(sdata);
 189
 190         /* Need to handle mesh specially to allow eliding the function call */
 191         if (ieee80211_vif_is_mesh(&sdata->vif))
 192                 mesh_rmc_free(dev);
 193
 194         switch (sdata->vif.type) {
 195         case IEEE80211_IF_TYPE_INVALID:
 196                 /* cannot happen */
 197                 WARN_ON(1);
 198                 break;
 199         case IEEE80211_IF_TYPE_AP: {
 200                 struct beacon_data *beacon;
 201
 202                 beacon = sdata->u.ap.beacon;
 203                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 204                 synchronize_rcu();
 205                 kfree(beacon);
 206
 207                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 208                         local->total_ps_buffered--;
 209                         dev_kfree_skb(skb);
 210                 }
 211
 212                 break;
 213         }
 214         case IEEE80211_IF_TYPE_WDS:
 215         case IEEE80211_IF_TYPE_VLAN:
 216                 /* nothing to do */
 217                 break;
 218         case IEEE80211_IF_TYPE_MESH_POINT:
 219         case IEEE80211_IF_TYPE_STA:
 220         case IEEE80211_IF_TYPE_IBSS:
 221                 kfree(sdata->u.sta.extra_ie);
 222                 sdata->u.sta.extra_ie = NULL;
 223                 kfree(sdata->u.sta.assocreq_ies);
 224                 sdata->u.sta.assocreq_ies = NULL;
 225                 kfree(sdata->u.sta.assocresp_ies);
 226                 sdata->u.sta.assocresp_ies = NULL;
 227                 if (sdata->u.sta.probe_resp) {
 228                         dev_kfree_skb(sdata->u.sta.probe_resp);
 229                         sdata->u.sta.probe_resp = NULL;
 230                 }
 231
 232                 break;
 233         case IEEE80211_IF_TYPE_MNTR:
 234                 dev->type = ARPHRD_ETHER;
 235                 break;
 236         }
 237
 238         flushed = sta_info_flush(local, sdata);
 239         WARN_ON(flushed);
 240
 241         memset(&sdata->u, 0, sizeof(sdata->u));
 242         ieee80211_if_sdata_init(sdata);
 243 }
 244
 245 /* Must be called with rtnl lock held. */
 246 void __ieee80211_if_del(struct ieee80211_local *local,
 247                         struct ieee80211_sub_if_data *sdata)
 248 {
 249         struct net_device *dev = sdata->dev;
 250
 251         ieee80211_debugfs_remove_netdev(sdata);
 252         unregister_netdevice(dev);
 253         /*
 254          * The net_device will be freed by its destructor,
 255          * i.e. ieee80211_if_free.
 256          */
 257 }
 258
 259 /* Must be called with rtnl lock held. */
 260 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 261 {
 262         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 263         struct ieee80211_sub_if_data *sdata, *n;
 264
 265         ASSERT_RTNL();
 266
 267         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
 268                 if ((sdata->vif.type == id || id == -1) &&
 269                     strcmp(name, sdata->dev->name) == 0) {
 270                         list_del_rcu(&sdata->list);
 271                         synchronize_rcu();
 272                         __ieee80211_if_del(local, sdata);
 273                         return 0;
 274                 }
 275         }
 276         return -ENODEV;
 277 }
 278
 279 void ieee80211_if_free(struct net_device *dev)
 280 {
 281         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 282
 283         ieee80211_if_sdata_deinit(sdata);
 284         free_netdev(dev);
 285 }