Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
[linux-2.6] / 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
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                      struct vif_params *params)
45 {
46         struct net_device *ndev;
47         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
48         struct ieee80211_sub_if_data *sdata = NULL;
49         int ret;
50
51         ASSERT_RTNL();
52         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
53                             name, ieee80211_if_setup);
54         if (!ndev)
55                 return -ENOMEM;
56
57         ret = dev_alloc_name(ndev, ndev->name);
58         if (ret < 0)
59                 goto fail;
60
61         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
62         ndev->base_addr = dev->base_addr;
63         ndev->irq = dev->irq;
64         ndev->mem_start = dev->mem_start;
65         ndev->mem_end = dev->mem_end;
66         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
67
68         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
69         ndev->ieee80211_ptr = &sdata->wdev;
70         sdata->wdev.wiphy = local->hw.wiphy;
71         sdata->vif.type = IEEE80211_IF_TYPE_AP;
72         sdata->dev = ndev;
73         sdata->local = local;
74         ieee80211_if_sdata_init(sdata);
75
76         ret = register_netdevice(ndev);
77         if (ret)
78                 goto fail;
79
80         ieee80211_debugfs_add_netdev(sdata);
81         ieee80211_if_set_type(ndev, type);
82
83         if (ieee80211_vif_is_mesh(&sdata->vif) &&
84             params && params->mesh_id_len)
85                 ieee80211_if_sta_set_mesh_id(&sdata->u.sta,
86                                              params->mesh_id_len,
87                                              params->mesh_id);
88
89         /* we're under RTNL so all this is fine */
90         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
91                 __ieee80211_if_del(local, sdata);
92                 return -ENODEV;
93         }
94         list_add_tail_rcu(&sdata->list, &local->interfaces);
95
96         if (new_dev)
97                 *new_dev = ndev;
98
99         return 0;
100
101 fail:
102         free_netdev(ndev);
103         return ret;
104 }
105
106 void ieee80211_if_set_type(struct net_device *dev, int type)
107 {
108         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
109         int oldtype = sdata->vif.type;
110
111         /*
112          * We need to call this function on the master interface
113          * which already has a hard_start_xmit routine assigned
114          * which must not be changed.
115          */
116         if (dev != sdata->local->mdev)
117                 dev->hard_start_xmit = ieee80211_subif_start_xmit;
118
119         /*
120          * Called even when register_netdevice fails, it would
121          * oops if assigned before initialising the rest.
122          */
123         dev->uninit = ieee80211_if_reinit;
124
125         /* most have no BSS pointer */
126         sdata->bss = NULL;
127         sdata->vif.type = type;
128
129         sdata->basic_rates = 0;
130
131         switch (type) {
132         case IEEE80211_IF_TYPE_WDS:
133                 /* nothing special */
134                 break;
135         case IEEE80211_IF_TYPE_VLAN:
136                 sdata->u.vlan.ap = NULL;
137                 break;
138         case IEEE80211_IF_TYPE_AP:
139                 sdata->u.ap.force_unicast_rateidx = -1;
140                 sdata->u.ap.max_ratectrl_rateidx = -1;
141                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
142                 sdata->bss = &sdata->u.ap;
143                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
144                 break;
145         case IEEE80211_IF_TYPE_MESH_POINT:
146         case IEEE80211_IF_TYPE_STA:
147         case IEEE80211_IF_TYPE_IBSS: {
148                 struct ieee80211_sub_if_data *msdata;
149                 struct ieee80211_if_sta *ifsta;
150
151                 ifsta = &sdata->u.sta;
152                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
153                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
154                             (unsigned long) sdata);
155                 skb_queue_head_init(&ifsta->skb_queue);
156
157                 ifsta->capab = WLAN_CAPABILITY_ESS;
158                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
159                         IEEE80211_AUTH_ALG_SHARED_KEY;
160                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
161                         IEEE80211_STA_WMM_ENABLED |
162                         IEEE80211_STA_AUTO_BSSID_SEL |
163                         IEEE80211_STA_AUTO_CHANNEL_SEL;
164
165                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
166                 sdata->bss = &msdata->u.ap;
167
168                 if (ieee80211_vif_is_mesh(&sdata->vif))
169                         ieee80211_mesh_init_sdata(sdata);
170                 break;
171         }
172         case IEEE80211_IF_TYPE_MNTR:
173                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
174                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
175                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
176                                       MONITOR_FLAG_OTHER_BSS;
177                 break;
178         default:
179                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
180                        dev->name, __func__, type);
181         }
182         ieee80211_debugfs_change_if_type(sdata, oldtype);
183 }
184
185 /* Must be called with rtnl lock held. */
186 void ieee80211_if_reinit(struct net_device *dev)
187 {
188         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
189         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
190         struct sk_buff *skb;
191         int flushed;
192
193         ASSERT_RTNL();
194
195         ieee80211_free_keys(sdata);
196
197         ieee80211_if_sdata_deinit(sdata);
198
199         /* Need to handle mesh specially to allow eliding the function call */
200         if (ieee80211_vif_is_mesh(&sdata->vif))
201                 mesh_rmc_free(dev);
202
203         switch (sdata->vif.type) {
204         case IEEE80211_IF_TYPE_INVALID:
205                 /* cannot happen */
206                 WARN_ON(1);
207                 break;
208         case IEEE80211_IF_TYPE_AP: {
209                 /* Remove all virtual interfaces that use this BSS
210                  * as their sdata->bss */
211                 struct ieee80211_sub_if_data *tsdata, *n;
212                 struct beacon_data *beacon;
213
214                 list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
215                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
216                                 printk(KERN_DEBUG "%s: removing virtual "
217                                        "interface %s because its BSS interface"
218                                        " is being removed\n",
219                                        sdata->dev->name, tsdata->dev->name);
220                                 list_del_rcu(&tsdata->list);
221                                 /*
222                                  * We have lots of time and can afford
223                                  * to sync for each interface
224                                  */
225                                 synchronize_rcu();
226                                 __ieee80211_if_del(local, tsdata);
227                         }
228                 }
229
230                 beacon = sdata->u.ap.beacon;
231                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
232                 synchronize_rcu();
233                 kfree(beacon);
234
235                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
236                         local->total_ps_buffered--;
237                         dev_kfree_skb(skb);
238                 }
239
240                 break;
241         }
242         case IEEE80211_IF_TYPE_WDS:
243                 /* nothing to do */
244                 break;
245         case IEEE80211_IF_TYPE_MESH_POINT:
246         case IEEE80211_IF_TYPE_STA:
247         case IEEE80211_IF_TYPE_IBSS:
248                 kfree(sdata->u.sta.extra_ie);
249                 sdata->u.sta.extra_ie = NULL;
250                 kfree(sdata->u.sta.assocreq_ies);
251                 sdata->u.sta.assocreq_ies = NULL;
252                 kfree(sdata->u.sta.assocresp_ies);
253                 sdata->u.sta.assocresp_ies = NULL;
254                 if (sdata->u.sta.probe_resp) {
255                         dev_kfree_skb(sdata->u.sta.probe_resp);
256                         sdata->u.sta.probe_resp = NULL;
257                 }
258
259                 break;
260         case IEEE80211_IF_TYPE_MNTR:
261                 dev->type = ARPHRD_ETHER;
262                 break;
263         case IEEE80211_IF_TYPE_VLAN:
264                 sdata->u.vlan.ap = NULL;
265                 break;
266         }
267
268         flushed = sta_info_flush(local, sdata);
269         WARN_ON(flushed);
270
271         memset(&sdata->u, 0, sizeof(sdata->u));
272         ieee80211_if_sdata_init(sdata);
273 }
274
275 /* Must be called with rtnl lock held. */
276 void __ieee80211_if_del(struct ieee80211_local *local,
277                         struct ieee80211_sub_if_data *sdata)
278 {
279         struct net_device *dev = sdata->dev;
280
281         ieee80211_debugfs_remove_netdev(sdata);
282         unregister_netdevice(dev);
283         /* Except master interface, the net_device will be freed by
284          * net_device->destructor (i. e. ieee80211_if_free). */
285 }
286
287 /* Must be called with rtnl lock held. */
288 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
289 {
290         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
291         struct ieee80211_sub_if_data *sdata, *n;
292
293         ASSERT_RTNL();
294
295         list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
296                 if ((sdata->vif.type == id || id == -1) &&
297                     strcmp(name, sdata->dev->name) == 0 &&
298                     sdata->dev != local->mdev) {
299                         list_del_rcu(&sdata->list);
300                         synchronize_rcu();
301                         __ieee80211_if_del(local, sdata);
302                         return 0;
303                 }
304         }
305         return -ENODEV;
306 }
307
308 void ieee80211_if_free(struct net_device *dev)
309 {
310         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
311
312         ieee80211_if_sdata_deinit(sdata);
313         free_netdev(dev);
314 }