mac80211: use nl80211 interface types
[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  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 #include <linux/kernel.h>
12 #include <linux/if_arp.h>
13 #include <linux/netdevice.h>
14 #include <linux/rtnetlink.h>
15 #include <net/mac80211.h>
16 #include "ieee80211_i.h"
17 #include "sta_info.h"
18 #include "debugfs_netdev.h"
19 #include "mesh.h"
20
21 /*
22  * Called when the netdev is removed or, by the code below, before
23  * the interface type changes.
24  */
25 static void ieee80211_teardown_sdata(struct net_device *dev)
26 {
27         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
28         struct ieee80211_local *local = sdata->local;
29         struct beacon_data *beacon;
30         struct sk_buff *skb;
31         int flushed;
32         int i;
33
34         /* free extra data */
35         ieee80211_free_keys(sdata);
36
37         ieee80211_debugfs_remove_netdev(sdata);
38
39         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
40                 __skb_queue_purge(&sdata->fragments[i].skb_list);
41         sdata->fragment_next = 0;
42
43         switch (sdata->vif.type) {
44         case NL80211_IFTYPE_AP:
45                 beacon = sdata->u.ap.beacon;
46                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
47                 synchronize_rcu();
48                 kfree(beacon);
49
50                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
51                         local->total_ps_buffered--;
52                         dev_kfree_skb(skb);
53                 }
54
55                 break;
56         case NL80211_IFTYPE_MESH_POINT:
57                 if (ieee80211_vif_is_mesh(&sdata->vif))
58                         mesh_rmc_free(sdata);
59                 break;
60         case NL80211_IFTYPE_STATION:
61         case NL80211_IFTYPE_ADHOC:
62                 kfree(sdata->u.sta.extra_ie);
63                 kfree(sdata->u.sta.assocreq_ies);
64                 kfree(sdata->u.sta.assocresp_ies);
65                 kfree_skb(sdata->u.sta.probe_resp);
66                 break;
67         case NL80211_IFTYPE_WDS:
68         case NL80211_IFTYPE_AP_VLAN:
69         case NL80211_IFTYPE_MONITOR:
70                 break;
71         case NL80211_IFTYPE_UNSPECIFIED:
72         case __NL80211_IFTYPE_AFTER_LAST:
73                 BUG();
74                 break;
75         }
76
77         flushed = sta_info_flush(local, sdata);
78         WARN_ON(flushed);
79 }
80
81 /*
82  * Helper function to initialise an interface to a specific type.
83  */
84 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
85                                   enum nl80211_iftype type)
86 {
87         /* clear type-dependent union */
88         memset(&sdata->u, 0, sizeof(sdata->u));
89
90         /* and set some type-dependent values */
91         sdata->vif.type = type;
92
93         /* only monitor differs */
94         sdata->dev->type = ARPHRD_ETHER;
95
96         switch (type) {
97         case NL80211_IFTYPE_AP:
98                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
99                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
100                 break;
101         case NL80211_IFTYPE_STATION:
102         case NL80211_IFTYPE_ADHOC:
103                 ieee80211_sta_setup_sdata(sdata);
104                 break;
105         case NL80211_IFTYPE_MESH_POINT:
106                 if (ieee80211_vif_is_mesh(&sdata->vif))
107                         ieee80211_mesh_init_sdata(sdata);
108                 break;
109         case NL80211_IFTYPE_MONITOR:
110                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
111                 sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit;
112                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
113                                       MONITOR_FLAG_OTHER_BSS;
114                 break;
115         case NL80211_IFTYPE_WDS:
116         case NL80211_IFTYPE_AP_VLAN:
117                 break;
118         case NL80211_IFTYPE_UNSPECIFIED:
119         case __NL80211_IFTYPE_AFTER_LAST:
120                 BUG();
121                 break;
122         }
123
124         ieee80211_debugfs_add_netdev(sdata);
125 }
126
127 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
128                              enum nl80211_iftype type)
129 {
130         ASSERT_RTNL();
131
132         if (type == sdata->vif.type)
133                 return 0;
134
135         /*
136          * We could, here, on changes between IBSS/STA/MESH modes,
137          * invoke an MLME function instead that disassociates etc.
138          * and goes into the requested mode.
139          */
140
141         if (netif_running(sdata->dev))
142                 return -EBUSY;
143
144         /* Purge and reset type-dependent state. */
145         ieee80211_teardown_sdata(sdata->dev);
146         ieee80211_setup_sdata(sdata, type);
147
148         /* reset some values that shouldn't be kept across type changes */
149         sdata->bss_conf.basic_rates =
150                 ieee80211_mandatory_rates(sdata->local,
151                         sdata->local->hw.conf.channel->band);
152         sdata->drop_unencrypted = 0;
153
154         return 0;
155 }
156
157 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
158                      struct net_device **new_dev, enum nl80211_iftype type,
159                      struct vif_params *params)
160 {
161         struct net_device *ndev;
162         struct ieee80211_sub_if_data *sdata = NULL;
163         int ret, i;
164
165         ASSERT_RTNL();
166
167         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
168                             name, ieee80211_if_setup);
169         if (!ndev)
170                 return -ENOMEM;
171
172         ndev->needed_headroom = local->tx_headroom +
173                                 4*6 /* four MAC addresses */
174                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
175                                 + 6 /* mesh */
176                                 + 8 /* rfc1042/bridge tunnel */
177                                 - ETH_HLEN /* ethernet hard_header_len */
178                                 + IEEE80211_ENCRYPT_HEADROOM;
179         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
180
181         ret = dev_alloc_name(ndev, ndev->name);
182         if (ret < 0)
183                 goto fail;
184
185         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
186         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
187
188         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
189         sdata = netdev_priv(ndev);
190         ndev->ieee80211_ptr = &sdata->wdev;
191
192         /* initialise type-independent data */
193         sdata->wdev.wiphy = local->hw.wiphy;
194         sdata->local = local;
195         sdata->dev = ndev;
196
197         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
198                 skb_queue_head_init(&sdata->fragments[i].skb_list);
199
200         INIT_LIST_HEAD(&sdata->key_list);
201
202         sdata->force_unicast_rateidx = -1;
203         sdata->max_ratectrl_rateidx = -1;
204
205         /* setup type-dependent data */
206         ieee80211_setup_sdata(sdata, type);
207
208         ret = register_netdevice(ndev);
209         if (ret)
210                 goto fail;
211
212         ndev->uninit = ieee80211_teardown_sdata;
213
214         if (ieee80211_vif_is_mesh(&sdata->vif) &&
215             params && params->mesh_id_len)
216                 ieee80211_sdata_set_mesh_id(sdata,
217                                             params->mesh_id_len,
218                                             params->mesh_id);
219
220         list_add_tail_rcu(&sdata->list, &local->interfaces);
221
222         if (new_dev)
223                 *new_dev = ndev;
224
225         return 0;
226
227  fail:
228         free_netdev(ndev);
229         return ret;
230 }
231
232 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
233 {
234         ASSERT_RTNL();
235
236         list_del_rcu(&sdata->list);
237         synchronize_rcu();
238         unregister_netdevice(sdata->dev);
239 }
240
241 /*
242  * Remove all interfaces, may only be called at hardware unregistration
243  * time because it doesn't do RCU-safe list removals.
244  */
245 void ieee80211_remove_interfaces(struct ieee80211_local *local)
246 {
247         struct ieee80211_sub_if_data *sdata, *tmp;
248
249         ASSERT_RTNL();
250
251         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
252                 list_del(&sdata->list);
253                 unregister_netdevice(sdata->dev);
254         }
255 }