aboutsummaryrefslogtreecommitdiff
path: root/net/mac80211/ieee80211_iface.c
blob: 64267d4b31a458f8be5f897139c298a2b1ee6b7d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "sta_info.h"

void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
{
	int i;

	/* Default values for sub-interface parameters */
	sdata->drop_unencrypted = 0;
	sdata->eapol = 1;
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
		skb_queue_head_init(&sdata->fragments[i].skb_list);
}

static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
{
	int i;

	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
		__skb_queue_purge(&sdata->fragments[i].skb_list);
	}
}

/* Must be called with rtnl lock held. */
int ieee80211_if_add(struct net_device *dev, const char *name,
		     struct net_device **new_dev, int type)
{
	struct net_device *ndev;
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = NULL;
	int ret;

	ASSERT_RTNL();
	ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
			    name, ieee80211_if_setup);
	if (!ndev)
		return -ENOMEM;

	ret = dev_alloc_name(ndev, ndev->name);
	if (ret < 0)
		goto fail;

	memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
	ndev->base_addr = dev->base_addr;
	ndev->irq = dev->irq;
	ndev->mem_start = dev->mem_start;
	ndev->mem_end = dev->mem_end;
	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));

	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
	ndev->ieee80211_ptr = &sdata->wdev;
	sdata->wdev.wiphy = local->hw.wiphy;
	sdata->type = IEEE80211_IF_TYPE_AP;
	sdata->dev = ndev;
	sdata->local = local;
	ieee80211_if_sdata_init(sdata);

	ret = register_netdevice(ndev);
	if (ret)
		goto fail;

	ieee80211_if_set_type(ndev, type);

	write_lock_bh(&local->sub_if_lock);
	if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
		write_unlock_bh(&local->sub_if_lock);
		__ieee80211_if_del(local, sdata);
		return -ENODEV;
	}
	list_add(&sdata->list, &local->sub_if_list);
	if (new_dev)
		*new_dev = ndev;
	write_unlock_bh(&local->sub_if_lock);

	ieee80211_update_default_wep_only(local);

	return 0;

fail:
	free_netdev(ndev);
	return ret;
}

int ieee80211_if_add_mgmt(struct ieee80211_local *local)
{
	struct net_device *ndev;
	struct ieee80211_sub_if_data *nsdata;
	int ret;

	ASSERT_RTNL();

	ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "wmgmt%d",
			    ieee80211_if_mgmt_setup);
	if (!ndev)
		return -ENOMEM;
	ret = dev_alloc_name(ndev, ndev->name);
	if (ret < 0)
		goto fail;

	memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));

	nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
	ndev->ieee80211_ptr = &nsdata->wdev;
	nsdata->wdev.wiphy = local->hw.wiphy;
	nsdata->type = IEEE80211_IF_TYPE_MGMT;
	nsdata->dev = ndev;
	nsdata->local = local;
	ieee80211_if_sdata_init(nsdata);

	ret = register_netdevice(ndev);
	if (ret)
		goto fail;

	if (local->open_count > 0)
		dev_open(ndev);
	local->apdev = ndev;
	return 0;

fail:
	free_netdev(ndev);
	return ret;
}

void ieee80211_if_del_mgmt(struct ieee80211_local *local)
{
	struct net_device *apdev;

	ASSERT_RTNL();
	apdev = local->apdev;
	local->apdev = NULL;
	unregister_netdevice(apdev);
}

void ieee80211_if_set_type(struct net_device *dev, int type)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);

	sdata->type = type;
	switch (type) {
	case IEEE80211_IF_TYPE_WDS:
		sdata->bss = NULL;
		break;
	case IEEE80211_IF_TYPE_VLAN:
		break;
	case IEEE80211_IF_TYPE_AP:
		sdata->u.ap.dtim_period = 2;
		sdata->u.ap.force_unicast_rateidx = -1;
		sdata->u.ap.max_ratectrl_rateidx = -1;
		skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
		sdata->bss = &sdata->u.ap;
		break;
	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_IBSS: {
		struct ieee80211_sub_if_data *msdata;
		struct ieee80211_if_sta *ifsta;

		ifsta = &sdata->u.sta;
		INIT_WORK(&ifsta->work, ieee80211_sta_work);
		setup_timer(&ifsta->timer, ieee80211_sta_timer,
			    (unsigned long) sdata);
		skb_queue_head_init(&ifsta->skb_queue);

		ifsta->capab = WLAN_CAPABILITY_ESS;
		ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
			IEEE80211_AUTH_ALG_SHARED_KEY;
		ifsta->create_ibss = 1;
		ifsta->wmm_enabled = 1;
		ifsta->auto_channel_sel = 1;
		ifsta->auto_bssid_sel = 1;

		msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
		sdata->bss = &msdata->u.ap;
		break;
	}
	case IEEE80211_IF_TYPE_MNTR:
		dev->type = ARPHRD_IEEE80211_RADIOTAP;
		break;
	default:
		printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
		       dev->name, __FUNCTION__, type);
	}
	ieee80211_update_default_wep_only(local);
}

/* Must be called with rtnl lock held. */
void ieee80211_if_reinit(struct net_device *dev)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct sta_info *sta;
	int i;

	ASSERT_RTNL();
	ieee80211_if_sdata_deinit(sdata);
	for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
		if (!sdata->keys[i])
			continue;
#if 0
		/* The interface is down at the moment, so there is not
		 * really much point in disabling the keys at this point. */
		memset(addr, 0xff, ETH_ALEN);
		if (local->ops->set_key)
			local->ops->set_key(local_to_hw(local), DISABLE_KEY, addr,
					    local->keys[i], 0);
#endif
		ieee80211_key_free(sdata->keys[i]);
		sdata->keys[i] = NULL;
	}

	switch (sdata->type) {
	case IEEE80211_IF_TYPE_AP: {
		/* Remove all virtual interfaces that use this BSS
		 * as their sdata->bss */
		struct ieee80211_sub_if_data *tsdata, *n;
		LIST_HEAD(tmp_list);

		write_lock_bh(&local->sub_if_lock);
		list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
			if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
				printk(KERN_DEBUG "%s: removing virtual "
				       "interface %s because its BSS interface"
				       " is being removed\n",
				       sdata->dev->name, tsdata->dev->name);
				list_move_tail(&tsdata->list, &tmp_list);
			}
		}
		write_unlock_bh(&local->sub_if_lock);

		list_for_each_entry_safe(tsdata, n, &tmp_list, list)
			__ieee80211_if_del(local, tsdata);

		kfree(sdata->u.ap.beacon_head);
		kfree(sdata->u.ap.beacon_tail);
		kfree(sdata->u.ap.generic_elem);

		if (dev != local->mdev) {
			struct sk_buff *skb;
			while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
				local->total_ps_buffered--;
				dev_kfree_skb(skb);
			}
		}

		break;
	}
	case IEEE80211_IF_TYPE_WDS:
		sta = sta_info_get(local, sdata->u.wds.remote_addr);
		if (sta) {
			sta_info_put(sta);
			sta_info_free(sta, 0);
		} else {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
			printk(KERN_DEBUG "%s: Someone had deleted my STA "
			       "entry for the WDS link\n", dev->name);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
		}
		break;
	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_IBSS:
		kfree(sdata->u.sta.extra_ie);
		sdata->u.sta.extra_ie = NULL;
		kfree(sdata->u.sta.assocreq_ies);
		sdata->u.sta.assocreq_ies = NULL;
		kfree(sdata->u.sta.assocresp_ies);
		sdata->u.sta.assocresp_ies = NULL;
		if (sdata->u.sta.probe_resp) {
			dev_kfree_skb(sdata->u.sta.probe_resp);
			sdata->u.sta.probe_resp = NULL;
		}

		break;
	case IEEE80211_IF_TYPE_MNTR:
		dev->type = ARPHRD_ETHER;
		break;
	}

	/* remove all STAs that are bound to this virtual interface */
	sta_info_flush(local, dev);

	memset(&sdata->u, 0, sizeof(sdata->u));
	ieee80211_if_sdata_init(sdata);
}

/* Must be called with rtnl lock held. */
void __ieee80211_if_del(struct ieee80211_local *local,
			struct ieee80211_sub_if_data *sdata)
{
	struct net_device *dev = sdata->dev;

	unregister_netdevice(dev);
	/* Except master interface, the net_device will be freed by
	 * net_device->destructor (i. e. ieee80211_if_free). */
}

/* Must be called with rtnl lock held. */
int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata, *n;

	ASSERT_RTNL();

	write_lock_bh(&local->sub_if_lock);
	list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
		if ((sdata->type == id || id == -1) &&
		    strcmp(name, sdata->dev->name) == 0 &&
		    sdata->dev != local->mdev) {
			list_del(&sdata->list);
			write_unlock_bh(&local->sub_if_lock);
			__ieee80211_if_del(local, sdata);
			ieee80211_update_default_wep_only(local);
			return 0;
		}
	}
	write_unlock_bh(&local->sub_if_lock);
	return -ENODEV;
}

void ieee80211_if_free(struct net_device *dev)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	/* local->apdev must be NULL when freeing management interface */
	BUG_ON(dev == local->apdev);
	ieee80211_if_sdata_deinit(sdata);
	free_netdev(dev);
}