mac80211: split off mesh handling entirely
[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         struct ieee80211_if_sta *ifsta;
87
88         /* clear type-dependent union */
89         memset(&sdata->u, 0, sizeof(sdata->u));
90
91         /* and set some type-dependent values */
92         sdata->vif.type = type;
93
94         /* only monitor differs */
95         sdata->dev->type = ARPHRD_ETHER;
96
97         switch (type) {
98         case IEEE80211_IF_TYPE_AP:
99                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
100                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
101                 break;
102         case IEEE80211_IF_TYPE_STA:
103         case IEEE80211_IF_TYPE_IBSS:
104                 ifsta = &sdata->u.sta;
105                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
106                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
107                             (unsigned long) sdata);
108                 skb_queue_head_init(&ifsta->skb_queue);
109
110                 ifsta->capab = WLAN_CAPABILITY_ESS;
111                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
112                         IEEE80211_AUTH_ALG_SHARED_KEY;
113                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
114                         IEEE80211_STA_AUTO_BSSID_SEL |
115                         IEEE80211_STA_AUTO_CHANNEL_SEL;
116                 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
117                         ifsta->flags |= IEEE80211_STA_WMM_ENABLED;
118                 break;
119         case IEEE80211_IF_TYPE_MESH_POINT:
120                 if (ieee80211_vif_is_mesh(&sdata->vif))
121                         ieee80211_mesh_init_sdata(sdata);
122                 break;
123         case IEEE80211_IF_TYPE_MNTR:
124                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
125                 sdata->dev->hard_start_xmit = ieee80211_monitor_start_xmit;
126                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
127                                       MONITOR_FLAG_OTHER_BSS;
128                 break;
129         case IEEE80211_IF_TYPE_WDS:
130         case IEEE80211_IF_TYPE_VLAN:
131                 break;
132         case IEEE80211_IF_TYPE_INVALID:
133                 BUG();
134                 break;
135         }
136
137         ieee80211_debugfs_add_netdev(sdata);
138 }
139
140 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
141                              enum ieee80211_if_types type)
142 {
143         ASSERT_RTNL();
144
145         if (type == sdata->vif.type)
146                 return 0;
147
148         /*
149          * We could, here, on changes between IBSS/STA/MESH modes,
150          * invoke an MLME function instead that disassociates etc.
151          * and goes into the requested mode.
152          */
153
154         if (netif_running(sdata->dev))
155                 return -EBUSY;
156
157         /* Purge and reset type-dependent state. */
158         ieee80211_teardown_sdata(sdata->dev);
159         ieee80211_setup_sdata(sdata, type);
160
161         /* reset some values that shouldn't be kept across type changes */
162         sdata->basic_rates = 0;
163         sdata->drop_unencrypted = 0;
164
165         return 0;
166 }
167
168 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
169                      struct net_device **new_dev, enum ieee80211_if_types type,
170                      struct vif_params *params)
171 {
172         struct net_device *ndev;
173         struct ieee80211_sub_if_data *sdata = NULL;
174         int ret, i;
175
176         ASSERT_RTNL();
177
178         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
179                             name, ieee80211_if_setup);
180         if (!ndev)
181                 return -ENOMEM;
182
183         ndev->needed_headroom = local->tx_headroom +
184                                 4*6 /* four MAC addresses */
185                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
186                                 + 6 /* mesh */
187                                 + 8 /* rfc1042/bridge tunnel */
188                                 - ETH_HLEN /* ethernet hard_header_len */
189                                 + IEEE80211_ENCRYPT_HEADROOM;
190         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
191
192         ret = dev_alloc_name(ndev, ndev->name);
193         if (ret < 0)
194                 goto fail;
195
196         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
197         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
198
199         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
200         sdata = netdev_priv(ndev);
201         ndev->ieee80211_ptr = &sdata->wdev;
202
203         /* initialise type-independent data */
204         sdata->wdev.wiphy = local->hw.wiphy;
205         sdata->local = local;
206         sdata->dev = ndev;
207
208         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
209                 skb_queue_head_init(&sdata->fragments[i].skb_list);
210
211         INIT_LIST_HEAD(&sdata->key_list);
212
213         sdata->force_unicast_rateidx = -1;
214         sdata->max_ratectrl_rateidx = -1;
215
216         /* setup type-dependent data */
217         ieee80211_setup_sdata(sdata, type);
218
219         ret = register_netdevice(ndev);
220         if (ret)
221                 goto fail;
222
223         ndev->uninit = ieee80211_teardown_sdata;
224
225         if (ieee80211_vif_is_mesh(&sdata->vif) &&
226             params && params->mesh_id_len)
227                 ieee80211_sdata_set_mesh_id(sdata,
228                                             params->mesh_id_len,
229                                             params->mesh_id);
230
231         list_add_tail_rcu(&sdata->list, &local->interfaces);
232
233         if (new_dev)
234                 *new_dev = ndev;
235
236         return 0;
237
238  fail:
239         free_netdev(ndev);
240         return ret;
241 }
242
243 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
244 {
245         ASSERT_RTNL();
246
247         list_del_rcu(&sdata->list);
248         synchronize_rcu();
249         unregister_netdevice(sdata->dev);
250 }
251
252 /*
253  * Remove all interfaces, may only be called at hardware unregistration
254  * time because it doesn't do RCU-safe list removals.
255  */
256 void ieee80211_remove_interfaces(struct ieee80211_local *local)
257 {
258         struct ieee80211_sub_if_data *sdata, *tmp;
259
260         ASSERT_RTNL();
261
262         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
263                 list_del(&sdata->list);
264                 unregister_netdevice(sdata->dev);
265         }
266 }