dab8eba2602f5b8fda13f1762e32e1649dbf3b93
[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 IEEE80211_IF_TYPE_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 IEEE80211_IF_TYPE_MESH_POINT:
57                 if (ieee80211_vif_is_mesh(&sdata->vif))
58                         mesh_rmc_free(sdata);
59                 break;
60         case IEEE80211_IF_TYPE_STA:
61         case IEEE80211_IF_TYPE_IBSS:
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 IEEE80211_IF_TYPE_WDS:
68         case IEEE80211_IF_TYPE_VLAN:
69         case IEEE80211_IF_TYPE_MNTR:
70                 break;
71         case IEEE80211_IF_TYPE_INVALID:
72                 BUG();
73                 break;
74         }
75
76         flushed = sta_info_flush(local, sdata);
77         WARN_ON(flushed);
78 }
79
80 /*
81  * Helper function to initialise an interface to a specific type.
82  */
83 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
84                                   enum ieee80211_if_types type)
85 {
86         /* clear type-dependent union */
87         memset(&sdata->u, 0, sizeof(sdata->u));
88
89         /* and set some type-dependent values */
90         sdata->vif.type = type;
91
92         /* only monitor differs */
93         sdata->dev->type = ARPHRD_ETHER;
94
95         switch (type) {
96         case IEEE80211_IF_TYPE_AP:
97                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
98                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
99                 break;
100         case IEEE80211_IF_TYPE_STA:
101         case IEEE80211_IF_TYPE_IBSS:
102                 ieee80211_sta_setup_sdata(sdata);
103                 break;
104         case IEEE80211_IF_TYPE_MESH_POINT:
105                 if (ieee80211_vif_is_mesh(&sdata->vif))
106                         ieee80211_mesh_init_sdata(sdata);
107                 break;
108         case IEEE80211_IF_TYPE_MNTR:
109                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
110                 sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit;
111                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
112                                       MONITOR_FLAG_OTHER_BSS;
113                 break;
114         case IEEE80211_IF_TYPE_WDS:
115         case IEEE80211_IF_TYPE_VLAN:
116                 break;
117         case IEEE80211_IF_TYPE_INVALID:
118                 BUG();
119                 break;
120         }
121
122         ieee80211_debugfs_add_netdev(sdata);
123 }
124
125 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
126                              enum ieee80211_if_types type)
127 {
128         ASSERT_RTNL();
129
130         if (type == sdata->vif.type)
131                 return 0;
132
133         /*
134          * We could, here, on changes between IBSS/STA/MESH modes,
135          * invoke an MLME function instead that disassociates etc.
136          * and goes into the requested mode.
137          */
138
139         if (netif_running(sdata->dev))
140                 return -EBUSY;
141
142         /* Purge and reset type-dependent state. */
143         ieee80211_teardown_sdata(sdata->dev);
144         ieee80211_setup_sdata(sdata, type);
145
146         /* reset some values that shouldn't be kept across type changes */
147         sdata->bss_conf.basic_rates =
148                 ieee80211_mandatory_rates(sdata->local,
149                         sdata->local->hw.conf.channel->band);
150         sdata->drop_unencrypted = 0;
151
152         return 0;
153 }
154
155 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
156                      struct net_device **new_dev, enum ieee80211_if_types type,
157                      struct vif_params *params)
158 {
159         struct net_device *ndev;
160         struct ieee80211_sub_if_data *sdata = NULL;
161         int ret, i;
162
163         ASSERT_RTNL();
164
165         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
166                             name, ieee80211_if_setup);
167         if (!ndev)
168                 return -ENOMEM;
169
170         ndev->needed_headroom = local->tx_headroom +
171                                 4*6 /* four MAC addresses */
172                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
173                                 + 6 /* mesh */
174                                 + 8 /* rfc1042/bridge tunnel */
175                                 - ETH_HLEN /* ethernet hard_header_len */
176                                 + IEEE80211_ENCRYPT_HEADROOM;
177         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
178
179         ret = dev_alloc_name(ndev, ndev->name);
180         if (ret < 0)
181                 goto fail;
182
183         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
184         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
185
186         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
187         sdata = netdev_priv(ndev);
188         ndev->ieee80211_ptr = &sdata->wdev;
189
190         /* initialise type-independent data */
191         sdata->wdev.wiphy = local->hw.wiphy;
192         sdata->local = local;
193         sdata->dev = ndev;
194
195         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
196                 skb_queue_head_init(&sdata->fragments[i].skb_list);
197
198         INIT_LIST_HEAD(&sdata->key_list);
199
200         sdata->force_unicast_rateidx = -1;
201         sdata->max_ratectrl_rateidx = -1;
202
203         /* setup type-dependent data */
204         ieee80211_setup_sdata(sdata, type);
205
206         ret = register_netdevice(ndev);
207         if (ret)
208                 goto fail;
209
210         ndev->uninit = ieee80211_teardown_sdata;
211
212         if (ieee80211_vif_is_mesh(&sdata->vif) &&
213             params && params->mesh_id_len)
214                 ieee80211_sdata_set_mesh_id(sdata,
215                                             params->mesh_id_len,
216                                             params->mesh_id);
217
218         list_add_tail_rcu(&sdata->list, &local->interfaces);
219
220         if (new_dev)
221                 *new_dev = ndev;
222
223         return 0;
224
225  fail:
226         free_netdev(ndev);
227         return ret;
228 }
229
230 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
231 {
232         ASSERT_RTNL();
233
234         list_del_rcu(&sdata->list);
235         synchronize_rcu();
236         unregister_netdevice(sdata->dev);
237 }
238
239 /*
240  * Remove all interfaces, may only be called at hardware unregistration
241  * time because it doesn't do RCU-safe list removals.
242  */
243 void ieee80211_remove_interfaces(struct ieee80211_local *local)
244 {
245         struct ieee80211_sub_if_data *sdata, *tmp;
246
247         ASSERT_RTNL();
248
249         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
250                 list_del(&sdata->list);
251                 unregister_netdevice(sdata->dev);
252         }
253 }