Merge git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[linux-2.6] / 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
30 static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
31 {
32         int i;
33
34         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
35                 __skb_queue_purge(&sdata->fragments[i].skb_list);
36         }
37 }
38
39 /* Must be called with rtnl lock held. */
40 int ieee80211_if_add(struct net_device *dev, const char *name,
41                      struct net_device **new_dev, int type)
42 {
43         struct net_device *ndev;
44         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
45         struct ieee80211_sub_if_data *sdata = NULL;
46         int ret;
47
48         ASSERT_RTNL();
49         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
50                             name, ieee80211_if_setup);
51         if (!ndev)
52                 return -ENOMEM;
53
54         ret = dev_alloc_name(ndev, ndev->name);
55         if (ret < 0)
56                 goto fail;
57
58         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
59         ndev->base_addr = dev->base_addr;
60         ndev->irq = dev->irq;
61         ndev->mem_start = dev->mem_start;
62         ndev->mem_end = dev->mem_end;
63         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
64
65         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
66         ndev->ieee80211_ptr = &sdata->wdev;
67         sdata->wdev.wiphy = local->hw.wiphy;
68         sdata->type = IEEE80211_IF_TYPE_AP;
69         sdata->dev = ndev;
70         sdata->local = local;
71         ieee80211_if_sdata_init(sdata);
72
73         ret = register_netdevice(ndev);
74         if (ret)
75                 goto fail;
76
77         ieee80211_debugfs_add_netdev(sdata);
78         ieee80211_if_set_type(ndev, type);
79
80         write_lock_bh(&local->sub_if_lock);
81         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
82                 write_unlock_bh(&local->sub_if_lock);
83                 __ieee80211_if_del(local, sdata);
84                 return -ENODEV;
85         }
86         list_add(&sdata->list, &local->sub_if_list);
87         if (new_dev)
88                 *new_dev = ndev;
89         write_unlock_bh(&local->sub_if_lock);
90
91         ieee80211_update_default_wep_only(local);
92
93         return 0;
94
95 fail:
96         free_netdev(ndev);
97         return ret;
98 }
99
100 int ieee80211_if_add_mgmt(struct ieee80211_local *local)
101 {
102         struct net_device *ndev;
103         struct ieee80211_sub_if_data *nsdata;
104         int ret;
105
106         ASSERT_RTNL();
107
108         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "wmgmt%d",
109                             ieee80211_if_mgmt_setup);
110         if (!ndev)
111                 return -ENOMEM;
112         ret = dev_alloc_name(ndev, ndev->name);
113         if (ret < 0)
114                 goto fail;
115
116         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
117         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
118
119         nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
120         ndev->ieee80211_ptr = &nsdata->wdev;
121         nsdata->wdev.wiphy = local->hw.wiphy;
122         nsdata->type = IEEE80211_IF_TYPE_MGMT;
123         nsdata->dev = ndev;
124         nsdata->local = local;
125         ieee80211_if_sdata_init(nsdata);
126
127         ret = register_netdevice(ndev);
128         if (ret)
129                 goto fail;
130
131         ieee80211_debugfs_add_netdev(nsdata);
132
133         if (local->open_count > 0)
134                 dev_open(ndev);
135         local->apdev = ndev;
136         return 0;
137
138 fail:
139         free_netdev(ndev);
140         return ret;
141 }
142
143 void ieee80211_if_del_mgmt(struct ieee80211_local *local)
144 {
145         struct net_device *apdev;
146
147         ASSERT_RTNL();
148         apdev = local->apdev;
149         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(apdev));
150         local->apdev = NULL;
151         unregister_netdevice(apdev);
152 }
153
154 void ieee80211_if_set_type(struct net_device *dev, int type)
155 {
156         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
157         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
158         int oldtype = sdata->type;
159
160         sdata->type = type;
161         switch (type) {
162         case IEEE80211_IF_TYPE_WDS:
163                 sdata->bss = NULL;
164                 break;
165         case IEEE80211_IF_TYPE_VLAN:
166                 break;
167         case IEEE80211_IF_TYPE_AP:
168                 sdata->u.ap.dtim_period = 2;
169                 sdata->u.ap.force_unicast_rateidx = -1;
170                 sdata->u.ap.max_ratectrl_rateidx = -1;
171                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
172                 sdata->bss = &sdata->u.ap;
173                 break;
174         case IEEE80211_IF_TYPE_STA:
175         case IEEE80211_IF_TYPE_IBSS: {
176                 struct ieee80211_sub_if_data *msdata;
177                 struct ieee80211_if_sta *ifsta;
178
179                 ifsta = &sdata->u.sta;
180                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
181                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
182                             (unsigned long) sdata);
183                 skb_queue_head_init(&ifsta->skb_queue);
184
185                 ifsta->capab = WLAN_CAPABILITY_ESS;
186                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
187                         IEEE80211_AUTH_ALG_SHARED_KEY;
188                 ifsta->create_ibss = 1;
189                 ifsta->wmm_enabled = 1;
190                 ifsta->auto_channel_sel = 1;
191                 ifsta->auto_bssid_sel = 1;
192
193                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
194                 sdata->bss = &msdata->u.ap;
195                 break;
196         }
197         case IEEE80211_IF_TYPE_MNTR:
198                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
199                 break;
200         default:
201                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
202                        dev->name, __FUNCTION__, type);
203         }
204         ieee80211_debugfs_change_if_type(sdata, oldtype);
205         ieee80211_update_default_wep_only(local);
206 }
207
208 /* Must be called with rtnl lock held. */
209 void ieee80211_if_reinit(struct net_device *dev)
210 {
211         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
212         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
213         struct sta_info *sta;
214         int i;
215
216         ASSERT_RTNL();
217         ieee80211_if_sdata_deinit(sdata);
218         for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
219                 if (!sdata->keys[i])
220                         continue;
221 #if 0
222                 /* The interface is down at the moment, so there is not
223                  * really much point in disabling the keys at this point. */
224                 memset(addr, 0xff, ETH_ALEN);
225                 if (local->ops->set_key)
226                         local->ops->set_key(local_to_hw(local), DISABLE_KEY, addr,
227                                             local->keys[i], 0);
228 #endif
229                 ieee80211_key_free(sdata->keys[i]);
230                 sdata->keys[i] = NULL;
231         }
232
233         switch (sdata->type) {
234         case IEEE80211_IF_TYPE_AP: {
235                 /* Remove all virtual interfaces that use this BSS
236                  * as their sdata->bss */
237                 struct ieee80211_sub_if_data *tsdata, *n;
238                 LIST_HEAD(tmp_list);
239
240                 write_lock_bh(&local->sub_if_lock);
241                 list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
242                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
243                                 printk(KERN_DEBUG "%s: removing virtual "
244                                        "interface %s because its BSS interface"
245                                        " is being removed\n",
246                                        sdata->dev->name, tsdata->dev->name);
247                                 list_move_tail(&tsdata->list, &tmp_list);
248                         }
249                 }
250                 write_unlock_bh(&local->sub_if_lock);
251
252                 list_for_each_entry_safe(tsdata, n, &tmp_list, list)
253                         __ieee80211_if_del(local, tsdata);
254
255                 kfree(sdata->u.ap.beacon_head);
256                 kfree(sdata->u.ap.beacon_tail);
257                 kfree(sdata->u.ap.generic_elem);
258
259                 if (dev != local->mdev) {
260                         struct sk_buff *skb;
261                         while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
262                                 local->total_ps_buffered--;
263                                 dev_kfree_skb(skb);
264                         }
265                 }
266
267                 break;
268         }
269         case IEEE80211_IF_TYPE_WDS:
270                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
271                 if (sta) {
272                         sta_info_put(sta);
273                         sta_info_free(sta, 0);
274                 } else {
275 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
276                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
277                                "entry for the WDS link\n", dev->name);
278 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
279                 }
280                 break;
281         case IEEE80211_IF_TYPE_STA:
282         case IEEE80211_IF_TYPE_IBSS:
283                 kfree(sdata->u.sta.extra_ie);
284                 sdata->u.sta.extra_ie = NULL;
285                 kfree(sdata->u.sta.assocreq_ies);
286                 sdata->u.sta.assocreq_ies = NULL;
287                 kfree(sdata->u.sta.assocresp_ies);
288                 sdata->u.sta.assocresp_ies = NULL;
289                 if (sdata->u.sta.probe_resp) {
290                         dev_kfree_skb(sdata->u.sta.probe_resp);
291                         sdata->u.sta.probe_resp = NULL;
292                 }
293
294                 break;
295         case IEEE80211_IF_TYPE_MNTR:
296                 dev->type = ARPHRD_ETHER;
297                 break;
298         }
299
300         /* remove all STAs that are bound to this virtual interface */
301         sta_info_flush(local, dev);
302
303         memset(&sdata->u, 0, sizeof(sdata->u));
304         ieee80211_if_sdata_init(sdata);
305 }
306
307 /* Must be called with rtnl lock held. */
308 void __ieee80211_if_del(struct ieee80211_local *local,
309                         struct ieee80211_sub_if_data *sdata)
310 {
311         struct net_device *dev = sdata->dev;
312
313         ieee80211_debugfs_remove_netdev(sdata);
314         unregister_netdevice(dev);
315         /* Except master interface, the net_device will be freed by
316          * net_device->destructor (i. e. ieee80211_if_free). */
317 }
318
319 /* Must be called with rtnl lock held. */
320 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
321 {
322         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
323         struct ieee80211_sub_if_data *sdata, *n;
324
325         ASSERT_RTNL();
326
327         write_lock_bh(&local->sub_if_lock);
328         list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
329                 if ((sdata->type == id || id == -1) &&
330                     strcmp(name, sdata->dev->name) == 0 &&
331                     sdata->dev != local->mdev) {
332                         list_del(&sdata->list);
333                         write_unlock_bh(&local->sub_if_lock);
334                         __ieee80211_if_del(local, sdata);
335                         ieee80211_update_default_wep_only(local);
336                         return 0;
337                 }
338         }
339         write_unlock_bh(&local->sub_if_lock);
340         return -ENODEV;
341 }
342
343 void ieee80211_if_free(struct net_device *dev)
344 {
345         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
346         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
347
348         /* local->apdev must be NULL when freeing management interface */
349         BUG_ON(dev == local->apdev);
350         ieee80211_if_sdata_deinit(sdata);
351         free_netdev(dev);
352 }