add updated mac80211 - this no longer relies on patching includes in the kernel trees...
[openwrt/openwrt.git] / package / mac80211 / src / 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 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 {
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(struct ieee80211_sub_if_data),
52 name, ieee80211_if_setup);
53 if (!ndev)
54 return -ENOMEM;
55
56 ret = dev_alloc_name(ndev, ndev->name);
57 if (ret < 0)
58 goto fail;
59
60 memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
61 ndev->base_addr = dev->base_addr;
62 ndev->irq = dev->irq;
63 ndev->mem_start = dev->mem_start;
64 ndev->mem_end = dev->mem_end;
65 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
66
67 sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
68 ndev->ieee80211_ptr = &sdata->wdev;
69 sdata->wdev.wiphy = local->hw.wiphy;
70 sdata->type = IEEE80211_IF_TYPE_AP;
71 sdata->dev = ndev;
72 sdata->local = local;
73 ieee80211_if_sdata_init(sdata);
74
75 ret = register_netdevice(ndev);
76 if (ret)
77 goto fail;
78
79 ieee80211_debugfs_add_netdev(sdata);
80 ieee80211_if_set_type(ndev, type);
81
82 /* we're under RTNL so all this is fine */
83 if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
84 __ieee80211_if_del(local, sdata);
85 return -ENODEV;
86 }
87 list_add_tail_rcu(&sdata->list, &local->interfaces);
88
89 if (new_dev)
90 *new_dev = ndev;
91
92 return 0;
93
94 fail:
95 free_netdev(ndev);
96 return ret;
97 }
98
99 void ieee80211_if_set_type(struct net_device *dev, int type)
100 {
101 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
102 int oldtype = sdata->type;
103
104 /*
105 * We need to call this function on the master interface
106 * which already has a hard_start_xmit routine assigned
107 * which must not be changed.
108 */
109 if (dev != sdata->local->mdev)
110 dev->hard_start_xmit = ieee80211_subif_start_xmit;
111
112 /*
113 * Called even when register_netdevice fails, it would
114 * oops if assigned before initialising the rest.
115 */
116 dev->uninit = ieee80211_if_reinit;
117
118 /* most have no BSS pointer */
119 sdata->bss = NULL;
120 sdata->type = type;
121
122 switch (type) {
123 case IEEE80211_IF_TYPE_WDS:
124 /* nothing special */
125 break;
126 case IEEE80211_IF_TYPE_VLAN:
127 sdata->u.vlan.ap = NULL;
128 break;
129 case IEEE80211_IF_TYPE_AP:
130 sdata->u.ap.dtim_period = 2;
131 sdata->u.ap.force_unicast_rateidx = -1;
132 sdata->u.ap.max_ratectrl_rateidx = -1;
133 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
134 sdata->bss = &sdata->u.ap;
135 INIT_LIST_HEAD(&sdata->u.ap.vlans);
136 break;
137 case IEEE80211_IF_TYPE_STA:
138 case IEEE80211_IF_TYPE_IBSS: {
139 struct ieee80211_sub_if_data *msdata;
140 struct ieee80211_if_sta *ifsta;
141
142 ifsta = &sdata->u.sta;
143 INIT_WORK(&ifsta->work, ieee80211_sta_work);
144 setup_timer(&ifsta->timer, ieee80211_sta_timer,
145 (unsigned long) sdata);
146 skb_queue_head_init(&ifsta->skb_queue);
147
148 ifsta->capab = WLAN_CAPABILITY_ESS;
149 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
150 IEEE80211_AUTH_ALG_SHARED_KEY;
151 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
152 IEEE80211_STA_WMM_ENABLED |
153 IEEE80211_STA_AUTO_BSSID_SEL |
154 IEEE80211_STA_AUTO_CHANNEL_SEL;
155
156 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
157 sdata->bss = &msdata->u.ap;
158 break;
159 }
160 case IEEE80211_IF_TYPE_MNTR:
161 dev->type = ARPHRD_IEEE80211_RADIOTAP;
162 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
163 break;
164 default:
165 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
166 dev->name, __FUNCTION__, type);
167 }
168 ieee80211_debugfs_change_if_type(sdata, oldtype);
169 }
170
171 /* Must be called with rtnl lock held. */
172 void ieee80211_if_reinit(struct net_device *dev)
173 {
174 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
175 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
176 struct sta_info *sta;
177 struct sk_buff *skb;
178
179 ASSERT_RTNL();
180
181 ieee80211_free_keys(sdata);
182
183 ieee80211_if_sdata_deinit(sdata);
184
185 switch (sdata->type) {
186 case IEEE80211_IF_TYPE_INVALID:
187 /* cannot happen */
188 WARN_ON(1);
189 break;
190 case IEEE80211_IF_TYPE_AP: {
191 /* Remove all virtual interfaces that use this BSS
192 * as their sdata->bss */
193 struct ieee80211_sub_if_data *tsdata, *n;
194
195 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
196 if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
197 printk(KERN_DEBUG "%s: removing virtual "
198 "interface %s because its BSS interface"
199 " is being removed\n",
200 sdata->dev->name, tsdata->dev->name);
201 list_del_rcu(&tsdata->list);
202 /*
203 * We have lots of time and can afford
204 * to sync for each interface
205 */
206 synchronize_rcu();
207 __ieee80211_if_del(local, tsdata);
208 }
209 }
210
211 kfree(sdata->u.ap.beacon_head);
212 kfree(sdata->u.ap.beacon_tail);
213
214 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
215 local->total_ps_buffered--;
216 dev_kfree_skb(skb);
217 }
218
219 break;
220 }
221 case IEEE80211_IF_TYPE_WDS:
222 sta = sta_info_get(local, sdata->u.wds.remote_addr);
223 if (sta) {
224 sta_info_free(sta);
225 sta_info_put(sta);
226 } else {
227 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
228 printk(KERN_DEBUG "%s: Someone had deleted my STA "
229 "entry for the WDS link\n", dev->name);
230 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
231 }
232 break;
233 case IEEE80211_IF_TYPE_STA:
234 case IEEE80211_IF_TYPE_IBSS:
235 kfree(sdata->u.sta.extra_ie);
236 sdata->u.sta.extra_ie = NULL;
237 kfree(sdata->u.sta.assocreq_ies);
238 sdata->u.sta.assocreq_ies = NULL;
239 kfree(sdata->u.sta.assocresp_ies);
240 sdata->u.sta.assocresp_ies = NULL;
241 if (sdata->u.sta.probe_resp) {
242 dev_kfree_skb(sdata->u.sta.probe_resp);
243 sdata->u.sta.probe_resp = NULL;
244 }
245
246 break;
247 case IEEE80211_IF_TYPE_MNTR:
248 dev->type = ARPHRD_ETHER;
249 break;
250 case IEEE80211_IF_TYPE_VLAN:
251 sdata->u.vlan.ap = NULL;
252 break;
253 }
254
255 /* remove all STAs that are bound to this virtual interface */
256 sta_info_flush(local, dev);
257
258 memset(&sdata->u, 0, sizeof(sdata->u));
259 ieee80211_if_sdata_init(sdata);
260 }
261
262 /* Must be called with rtnl lock held. */
263 void __ieee80211_if_del(struct ieee80211_local *local,
264 struct ieee80211_sub_if_data *sdata)
265 {
266 struct net_device *dev = sdata->dev;
267
268 ieee80211_debugfs_remove_netdev(sdata);
269 unregister_netdevice(dev);
270 /* Except master interface, the net_device will be freed by
271 * net_device->destructor (i. e. ieee80211_if_free). */
272 }
273
274 /* Must be called with rtnl lock held. */
275 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
276 {
277 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
278 struct ieee80211_sub_if_data *sdata, *n;
279
280 ASSERT_RTNL();
281
282 list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
283 if ((sdata->type == id || id == -1) &&
284 strcmp(name, sdata->dev->name) == 0 &&
285 sdata->dev != local->mdev) {
286 list_del_rcu(&sdata->list);
287 synchronize_rcu();
288 __ieee80211_if_del(local, sdata);
289 return 0;
290 }
291 }
292 return -ENODEV;
293 }
294
295 void ieee80211_if_free(struct net_device *dev)
296 {
297 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
298
299 ieee80211_if_sdata_deinit(sdata);
300 free_netdev(dev);
301 }