xref: /openbmc/linux/net/mac80211/iface.c (revision f42b3800)
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 }
315