Merge branch 'upstream-next' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6.git] / 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         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->vif.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         if (ieee80211_vif_is_mesh(&sdata->vif) &&
83             params && params->mesh_id_len)
84                 ieee80211_if_sta_set_mesh_id(&sdata->u.sta,
85                                              params->mesh_id_len,
86                                              params->mesh_id);
87
88         /* we're under RTNL so all this is fine */
89         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
90                 __ieee80211_if_del(local, sdata);
91                 return -ENODEV;
92         }
93         list_add_tail_rcu(&sdata->list, &local->interfaces);
94
95         if (new_dev)
96                 *new_dev = ndev;
97
98         return 0;
99
100 fail:
101         free_netdev(ndev);
102         return ret;
103 }
104
105 void ieee80211_if_set_type(struct net_device *dev, int type)
106 {
107         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
108         int oldtype = sdata->vif.type;
109
110         /*
111          * We need to call this function on the master interface
112          * which already has a hard_start_xmit routine assigned
113          * which must not be changed.
114          */
115         if (dev != sdata->local->mdev)
116                 dev->hard_start_xmit = ieee80211_subif_start_xmit;
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                 /* nothing special */
133                 break;
134         case IEEE80211_IF_TYPE_VLAN:
135                 sdata->u.vlan.ap = NULL;
136                 break;
137         case IEEE80211_IF_TYPE_AP:
138                 sdata->u.ap.force_unicast_rateidx = -1;
139                 sdata->u.ap.max_ratectrl_rateidx = -1;
140                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
141                 sdata->bss = &sdata->u.ap;
142                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
143                 break;
144         case IEEE80211_IF_TYPE_MESH_POINT:
145         case IEEE80211_IF_TYPE_STA:
146         case IEEE80211_IF_TYPE_IBSS: {
147                 struct ieee80211_sub_if_data *msdata;
148                 struct ieee80211_if_sta *ifsta;
149
150                 ifsta = &sdata->u.sta;
151                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
152                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
153                             (unsigned long) sdata);
154                 skb_queue_head_init(&ifsta->skb_queue);
155
156                 ifsta->capab = WLAN_CAPABILITY_ESS;
157                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
158                         IEEE80211_AUTH_ALG_SHARED_KEY;
159                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
160                         IEEE80211_STA_WMM_ENABLED |
161                         IEEE80211_STA_AUTO_BSSID_SEL |
162                         IEEE80211_STA_AUTO_CHANNEL_SEL;
163
164                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
165                 sdata->bss = &msdata->u.ap;
166
167                 if (ieee80211_vif_is_mesh(&sdata->vif))
168                         ieee80211_mesh_init_sdata(sdata);
169                 break;
170         }
171         case IEEE80211_IF_TYPE_MNTR:
172                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
173                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
174                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
175                                       MONITOR_FLAG_OTHER_BSS;
176                 break;
177         default:
178                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
179                        dev->name, __func__, type);
180         }
181         ieee80211_debugfs_change_if_type(sdata, oldtype);
182 }
183
184 /* Must be called with rtnl lock held. */
185 void ieee80211_if_reinit(struct net_device *dev)
186 {
187         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
188         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
189         struct sk_buff *skb;
190         int flushed;
191
192         ASSERT_RTNL();
193
194         ieee80211_free_keys(sdata);
195
196         ieee80211_if_sdata_deinit(sdata);
197
198         /* Need to handle mesh specially to allow eliding the function call */
199         if (ieee80211_vif_is_mesh(&sdata->vif))
200                 mesh_rmc_free(dev);
201
202         switch (sdata->vif.type) {
203         case IEEE80211_IF_TYPE_INVALID:
204                 /* cannot happen */
205                 WARN_ON(1);
206                 break;
207         case IEEE80211_IF_TYPE_AP: {
208                 /* Remove all virtual interfaces that use this BSS
209                  * as their sdata->bss */
210                 struct ieee80211_sub_if_data *tsdata, *n;
211                 struct beacon_data *beacon;
212
213                 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
214                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
215                                 printk(KERN_DEBUG "%s: removing virtual "
216                                        "interface %s because its BSS interface"
217                                        " is being removed\n",
218                                        sdata->dev->name, tsdata->dev->name);
219                                 list_del_rcu(&tsdata->list);
220                                 /*
221                                  * We have lots of time and can afford
222                                  * to sync for each interface
223                                  */
224                                 synchronize_rcu();
225                                 __ieee80211_if_del(local, tsdata);
226                         }
227                 }
228
229                 beacon = sdata->u.ap.beacon;
230                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
231                 synchronize_rcu();
232                 kfree(beacon);
233
234                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
235                         local->total_ps_buffered--;
236                         dev_kfree_skb(skb);
237                 }
238
239                 break;
240         }
241         case IEEE80211_IF_TYPE_WDS:
242                 /* nothing to do */
243                 break;
244         case IEEE80211_IF_TYPE_MESH_POINT:
245         case IEEE80211_IF_TYPE_STA:
246         case IEEE80211_IF_TYPE_IBSS:
247                 kfree(sdata->u.sta.extra_ie);
248                 sdata->u.sta.extra_ie = NULL;
249                 kfree(sdata->u.sta.assocreq_ies);
250                 sdata->u.sta.assocreq_ies = NULL;
251                 kfree(sdata->u.sta.assocresp_ies);
252                 sdata->u.sta.assocresp_ies = NULL;
253                 if (sdata->u.sta.probe_resp) {
254                         dev_kfree_skb(sdata->u.sta.probe_resp);
255                         sdata->u.sta.probe_resp = NULL;
256                 }
257
258                 break;
259         case IEEE80211_IF_TYPE_MNTR:
260                 dev->type = ARPHRD_ETHER;
261                 break;
262         case IEEE80211_IF_TYPE_VLAN:
263                 sdata->u.vlan.ap = NULL;
264                 break;
265         }
266
267         flushed = sta_info_flush(local, sdata);
268         WARN_ON(flushed);
269
270         memset(&sdata->u, 0, sizeof(sdata->u));
271         ieee80211_if_sdata_init(sdata);
272 }
273
274 /* Must be called with rtnl lock held. */
275 void __ieee80211_if_del(struct ieee80211_local *local,
276                         struct ieee80211_sub_if_data *sdata)
277 {
278         struct net_device *dev = sdata->dev;
279
280         ieee80211_debugfs_remove_netdev(sdata);
281         unregister_netdevice(dev);
282         /* Except master interface, the net_device will be freed by
283          * net_device->destructor (i. e. ieee80211_if_free). */
284 }
285
286 /* Must be called with rtnl lock held. */
287 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
288 {
289         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
290         struct ieee80211_sub_if_data *sdata, *n;
291
292         ASSERT_RTNL();
293
294         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
295                 if ((sdata->vif.type == id || id == -1) &&
296                     strcmp(name, sdata->dev->name) == 0 &&
297                     sdata->dev != local->mdev) {
298                         list_del_rcu(&sdata->list);
299                         synchronize_rcu();
300                         __ieee80211_if_del(local, sdata);
301                         return 0;
302                 }
303         }
304         return -ENODEV;
305 }
306
307 void ieee80211_if_free(struct net_device *dev)
308 {
309         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
310
311         ieee80211_if_sdata_deinit(sdata);
312         free_netdev(dev);
313 }