[mirror_ubuntu-bionic-kernel.git] / net / mac80211 / ieee80211_iface.c

/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "sta_info.h"
#include "debugfs_netdev.h"

void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
{
	int i;

	/* Default values for sub-interface parameters */
	sdata->drop_unencrypted = 0;
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
		skb_queue_head_init(&sdata->fragments[i].skb_list);

	INIT_LIST_HEAD(&sdata->key_list);
}

static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
{
	int i;

	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
		__skb_queue_purge(&sdata->fragments[i].skb_list);
	}
}

/* Must be called with rtnl lock held. */
int ieee80211_if_add(struct net_device *dev, const char *name,
		     struct net_device **new_dev, int type)
{
	struct net_device *ndev;
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = NULL;
	int ret;

	ASSERT_RTNL();
	ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
			    name, ieee80211_if_setup);
	if (!ndev)
		return -ENOMEM;

	ret = dev_alloc_name(ndev, ndev->name);
	if (ret < 0)
		goto fail;

	memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
	ndev->base_addr = dev->base_addr;
	ndev->irq = dev->irq;
	ndev->mem_start = dev->mem_start;
	ndev->mem_end = dev->mem_end;
	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));

	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
	ndev->ieee80211_ptr = &sdata->wdev;
	sdata->wdev.wiphy = local->hw.wiphy;
	sdata->vif.type = IEEE80211_IF_TYPE_AP;
	sdata->dev = ndev;
	sdata->local = local;
	ieee80211_if_sdata_init(sdata);

	ret = register_netdevice(ndev);
	if (ret)
		goto fail;

	ieee80211_debugfs_add_netdev(sdata);
	ieee80211_if_set_type(ndev, type);

	/* we're under RTNL so all this is fine */
	if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
		__ieee80211_if_del(local, sdata);
		return -ENODEV;
	}
	list_add_tail_rcu(&sdata->list, &local->interfaces);

	if (new_dev)
		*new_dev = ndev;

	return 0;

fail:
	free_netdev(ndev);
	return ret;
}

void ieee80211_if_set_type(struct net_device *dev, int type)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	int oldtype = sdata->vif.type;

	/*
	 * We need to call this function on the master interface
	 * which already has a hard_start_xmit routine assigned
	 * which must not be changed.
	 */
	if (dev != sdata->local->mdev)
		dev->hard_start_xmit = ieee80211_subif_start_xmit;

	/*
	 * Called even when register_netdevice fails, it would
	 * oops if assigned before initialising the rest.
	 */
	dev->uninit = ieee80211_if_reinit;

	/* most have no BSS pointer */
	sdata->bss = NULL;
	sdata->vif.type = type;

	sdata->basic_rates = 0;

	switch (type) {
	case IEEE80211_IF_TYPE_WDS:
		/* nothing special */
		break;
	case IEEE80211_IF_TYPE_VLAN:
		sdata->u.vlan.ap = NULL;
		break;
	case IEEE80211_IF_TYPE_AP:
		sdata->u.ap.force_unicast_rateidx = -1;
		sdata->u.ap.max_ratectrl_rateidx = -1;
		skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
		sdata->bss = &sdata->u.ap;
		INIT_LIST_HEAD(&sdata->u.ap.vlans);
		break;
	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_IBSS: {
		struct ieee80211_sub_if_data *msdata;
		struct ieee80211_if_sta *ifsta;

		ifsta = &sdata->u.sta;
		INIT_WORK(&ifsta->work, ieee80211_sta_work);
		setup_timer(&ifsta->timer, ieee80211_sta_timer,
			    (unsigned long) sdata);
		skb_queue_head_init(&ifsta->skb_queue);

		ifsta->capab = WLAN_CAPABILITY_ESS;
		ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
			IEEE80211_AUTH_ALG_SHARED_KEY;
		ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
			IEEE80211_STA_WMM_ENABLED |
			IEEE80211_STA_AUTO_BSSID_SEL |
			IEEE80211_STA_AUTO_CHANNEL_SEL;

		msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
		sdata->bss = &msdata->u.ap;
		break;
	}
	case IEEE80211_IF_TYPE_MNTR:
		dev->type = ARPHRD_IEEE80211_RADIOTAP;
		dev->hard_start_xmit = ieee80211_monitor_start_xmit;
		break;
	default:
		printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
		       dev->name, __FUNCTION__, type);
	}
	ieee80211_debugfs_change_if_type(sdata, oldtype);
}

/* Must be called with rtnl lock held. */
void ieee80211_if_reinit(struct net_device *dev)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct sta_info *sta;
	struct sk_buff *skb;

	ASSERT_RTNL();

	ieee80211_free_keys(sdata);

	ieee80211_if_sdata_deinit(sdata);

	switch (sdata->vif.type) {
	case IEEE80211_IF_TYPE_INVALID:
		/* cannot happen */
		WARN_ON(1);
		break;
	case IEEE80211_IF_TYPE_AP: {
		/* Remove all virtual interfaces that use this BSS
		 * as their sdata->bss */
		struct ieee80211_sub_if_data *tsdata, *n;

		list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
			if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
				printk(KERN_DEBUG "%s: removing virtual "
				       "interface %s because its BSS interface"
				       " is being removed\n",
				       sdata->dev->name, tsdata->dev->name);
				list_del_rcu(&tsdata->list);
				/*
				 * We have lots of time and can afford
				 * to sync for each interface
				 */
				synchronize_rcu();
				__ieee80211_if_del(local, tsdata);
			}
		}

		kfree(sdata->u.ap.beacon);

		while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
			local->total_ps_buffered--;
			dev_kfree_skb(skb);
		}

		break;
	}
	case IEEE80211_IF_TYPE_WDS:
		sta = sta_info_get(local, sdata->u.wds.remote_addr);
		if (sta) {
			sta_info_free(sta);
			sta_info_put(sta);
		} else {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
			printk(KERN_DEBUG "%s: Someone had deleted my STA "
			       "entry for the WDS link\n", dev->name);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
		}
		break;
	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_IBSS:
		kfree(sdata->u.sta.extra_ie);
		sdata->u.sta.extra_ie = NULL;
		kfree(sdata->u.sta.assocreq_ies);
		sdata->u.sta.assocreq_ies = NULL;
		kfree(sdata->u.sta.assocresp_ies);
		sdata->u.sta.assocresp_ies = NULL;
		if (sdata->u.sta.probe_resp) {
			dev_kfree_skb(sdata->u.sta.probe_resp);
			sdata->u.sta.probe_resp = NULL;
		}

		break;
	case IEEE80211_IF_TYPE_MNTR:
		dev->type = ARPHRD_ETHER;
		break;
	case IEEE80211_IF_TYPE_VLAN:
		sdata->u.vlan.ap = NULL;
		break;
	}

	/* remove all STAs that are bound to this virtual interface */
	sta_info_flush(local, dev);

	memset(&sdata->u, 0, sizeof(sdata->u));
	ieee80211_if_sdata_init(sdata);
}

/* Must be called with rtnl lock held. */
void __ieee80211_if_del(struct ieee80211_local *local,
			struct ieee80211_sub_if_data *sdata)
{
	struct net_device *dev = sdata->dev;

	ieee80211_debugfs_remove_netdev(sdata);
	unregister_netdevice(dev);
	/* Except master interface, the net_device will be freed by
	 * net_device->destructor (i. e. ieee80211_if_free). */
}

/* Must be called with rtnl lock held. */
int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata, *n;

	ASSERT_RTNL();

	list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
		if ((sdata->vif.type == id || id == -1) &&
		    strcmp(name, sdata->dev->name) == 0 &&
		    sdata->dev != local->mdev) {
			list_del_rcu(&sdata->list);
			synchronize_rcu();
			__ieee80211_if_del(local, sdata);
			return 0;
		}
	}
	return -ENODEV;
}

void ieee80211_if_free(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	ieee80211_if_sdata_deinit(sdata);
	free_netdev(dev);
}
Commit	Line	Data
f0706e82 JB	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"
e9f207f0	17	#include "debugfs_netdev.h"
f0706e82 JB	18
	19	void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
	20	{
	21	int i;
	22
	23	/* Default values for sub-interface parameters */
	24	sdata->drop_unencrypted = 0;
f0706e82 JB	25	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
f0706e82 JB	26	skb_queue_head_init(&sdata->fragments[i].skb_list);
11a843b7 JB	27
11a843b7 JB	28	INIT_LIST_HEAD(&sdata->key_list);
f0706e82 JB	29	}
	30
	31	static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
	32	{
	33	int i;
	34
	35	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
	36	__skb_queue_purge(&sdata->fragments[i].skb_list);
	37	}
	38	}
	39
	40	/* Must be called with rtnl lock held. */
	41	int ieee80211_if_add(struct net_device dev, const char name,
	42	struct net_device **new_dev, int type)
	43	{
	44	struct net_device *ndev;
	45	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	46	struct ieee80211_sub_if_data *sdata = NULL;
	47	int ret;
	48
	49	ASSERT_RTNL();
32bfd35d	50	ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
f0706e82 JB	51	name, ieee80211_if_setup);
	52	if (!ndev)
	53	return -ENOMEM;
	54
	55	ret = dev_alloc_name(ndev, ndev->name);
	56	if (ret < 0)
	57	goto fail;
	58
	59	memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
	60	ndev->base_addr = dev->base_addr;
	61	ndev->irq = dev->irq;
	62	ndev->mem_start = dev->mem_start;
	63	ndev->mem_end = dev->mem_end;
	64	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
	65
	66	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
	67	ndev->ieee80211_ptr = &sdata->wdev;
	68	sdata->wdev.wiphy = local->hw.wiphy;
51fb61e7	69	sdata->vif.type = IEEE80211_IF_TYPE_AP;
f0706e82 JB	70	sdata->dev = ndev;
	71	sdata->local = local;
	72	ieee80211_if_sdata_init(sdata);
	73
	74	ret = register_netdevice(ndev);
	75	if (ret)
	76	goto fail;
	77
e9f207f0	78	ieee80211_debugfs_add_netdev(sdata);
f0706e82 JB	79	ieee80211_if_set_type(ndev, type);
f0706e82 JB	80
79010420	81	/* we're under RTNL so all this is fine */
f0706e82	82	if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
f0706e82 JB	83	__ieee80211_if_del(local, sdata);
	84	return -ENODEV;
	85	}
79010420 JB	86	list_add_tail_rcu(&sdata->list, &local->interfaces);
79010420 JB	87
f0706e82 JB	88	if (new_dev)
f0706e82 JB	89	*new_dev = ndev;
f0706e82	90
f0706e82 JB	91	return 0;
	92
	93	fail:
	94	free_netdev(ndev);
	95	return ret;
	96	}
	97
f0706e82 JB	98	void ieee80211_if_set_type(struct net_device *dev, int type)
	99	{
	100	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
51fb61e7	101	int oldtype = sdata->vif.type;
f0706e82	102
5b2812e9 JB	103	/*
	104	* We need to call this function on the master interface
	105	* which already has a hard_start_xmit routine assigned
	106	* which must not be changed.
	107	*/
0654ff05	108	if (dev != sdata->local->mdev)
5b2812e9 JB	109	dev->hard_start_xmit = ieee80211_subif_start_xmit;
	110
	111	/*
	112	* Called even when register_netdevice fails, it would
	113	* oops if assigned before initialising the rest.
	114	*/
	115	dev->uninit = ieee80211_if_reinit;
	116
	117	/* most have no BSS pointer */
	118	sdata->bss = NULL;
51fb61e7	119	sdata->vif.type = type;
5b2812e9	120
8318d78a JB	121	sdata->basic_rates = 0;
8318d78a JB	122
f0706e82 JB	123	switch (type) {
f0706e82 JB	124	case IEEE80211_IF_TYPE_WDS:
5b2812e9	125	/* nothing special */
f0706e82 JB	126	break;
f0706e82 JB	127	case IEEE80211_IF_TYPE_VLAN:
0ec3ca44	128	sdata->u.vlan.ap = NULL;
f0706e82 JB	129	break;
f0706e82 JB	130	case IEEE80211_IF_TYPE_AP:
f0706e82 JB	131	sdata->u.ap.force_unicast_rateidx = -1;
	132	sdata->u.ap.max_ratectrl_rateidx = -1;
	133	skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
	134	sdata->bss = &sdata->u.ap;
0ec3ca44	135	INIT_LIST_HEAD(&sdata->u.ap.vlans);
f0706e82 JB	136	break;
	137	case IEEE80211_IF_TYPE_STA:
	138	case IEEE80211_IF_TYPE_IBSS: {
	139	struct ieee80211_sub_if_data *msdata;
	140	struct ieee80211_if_sta *ifsta;
	141
	142	ifsta = &sdata->u.sta;
	143	INIT_WORK(&ifsta->work, ieee80211_sta_work);
	144	setup_timer(&ifsta->timer, ieee80211_sta_timer,
	145	(unsigned long) sdata);
	146	skb_queue_head_init(&ifsta->skb_queue);
	147
	148	ifsta->capab = WLAN_CAPABILITY_ESS;
	149	ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN \|
	150	IEEE80211_AUTH_ALG_SHARED_KEY;
d6f2da5b JS	151	ifsta->flags \|= IEEE80211_STA_CREATE_IBSS \|
	152	IEEE80211_STA_WMM_ENABLED \|
	153	IEEE80211_STA_AUTO_BSSID_SEL \|
	154	IEEE80211_STA_AUTO_CHANNEL_SEL;
f0706e82 JB	155
	156	msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
	157	sdata->bss = &msdata->u.ap;
	158	break;
	159	}
	160	case IEEE80211_IF_TYPE_MNTR:
	161	dev->type = ARPHRD_IEEE80211_RADIOTAP;
40f7cac9	162	dev->hard_start_xmit = ieee80211_monitor_start_xmit;
f0706e82 JB	163	break;
	164	default:
	165	printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
	166	dev->name, __FUNCTION__, type);
	167	}
e9f207f0	168	ieee80211_debugfs_change_if_type(sdata, oldtype);
f0706e82 JB	169	}
	170
	171	/* Must be called with rtnl lock held. */
	172	void ieee80211_if_reinit(struct net_device *dev)
	173	{
	174	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	175	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	176	struct sta_info *sta;
5b2812e9	177	struct sk_buff *skb;
f0706e82 JB	178
f0706e82 JB	179	ASSERT_RTNL();
11a843b7 JB	180
	181	ieee80211_free_keys(sdata);
	182
f0706e82	183	ieee80211_if_sdata_deinit(sdata);
f0706e82	184
51fb61e7	185	switch (sdata->vif.type) {
a2897552 JB	186	case IEEE80211_IF_TYPE_INVALID:
	187	/* cannot happen */
	188	WARN_ON(1);
	189	break;
f0706e82 JB	190	case IEEE80211_IF_TYPE_AP: {
	191	/* Remove all virtual interfaces that use this BSS
	192	* as their sdata->bss */
	193	struct ieee80211_sub_if_data tsdata, n;
f0706e82	194
79010420	195	list_for_each_entry_safe(tsdata, n, &local->interfaces, list) {
f0706e82 JB	196	if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
	197	printk(KERN_DEBUG "%s: removing virtual "
	198	"interface %s because its BSS interface"
	199	" is being removed\n",
	200	sdata->dev->name, tsdata->dev->name);
79010420 JB	201	list_del_rcu(&tsdata->list);
	202	/*
	203	* We have lots of time and can afford
	204	* to sync for each interface
	205	*/
	206	synchronize_rcu();
	207	__ieee80211_if_del(local, tsdata);
f0706e82 JB	208	}
f0706e82 JB	209	}
f0706e82	210
5dfdaf58	211	kfree(sdata->u.ap.beacon);
f0706e82	212
5b2812e9 JB	213	while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
	214	local->total_ps_buffered--;
	215	dev_kfree_skb(skb);
f0706e82 JB	216	}
	217
	218	break;
	219	}
	220	case IEEE80211_IF_TYPE_WDS:
	221	sta = sta_info_get(local, sdata->u.wds.remote_addr);
	222	if (sta) {
be8755e1	223	sta_info_free(sta);
f0706e82	224	sta_info_put(sta);
f0706e82 JB	225	} else {
	226	#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	227	printk(KERN_DEBUG "%s: Someone had deleted my STA "
	228	"entry for the WDS link\n", dev->name);
	229	#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
	230	}
	231	break;
	232	case IEEE80211_IF_TYPE_STA:
	233	case IEEE80211_IF_TYPE_IBSS:
	234	kfree(sdata->u.sta.extra_ie);
	235	sdata->u.sta.extra_ie = NULL;
	236	kfree(sdata->u.sta.assocreq_ies);
	237	sdata->u.sta.assocreq_ies = NULL;
	238	kfree(sdata->u.sta.assocresp_ies);
	239	sdata->u.sta.assocresp_ies = NULL;
	240	if (sdata->u.sta.probe_resp) {
	241	dev_kfree_skb(sdata->u.sta.probe_resp);
	242	sdata->u.sta.probe_resp = NULL;
	243	}
	244
	245	break;
	246	case IEEE80211_IF_TYPE_MNTR:
	247	dev->type = ARPHRD_ETHER;
	248	break;
0ec3ca44 JB	249	case IEEE80211_IF_TYPE_VLAN:
	250	sdata->u.vlan.ap = NULL;
	251	break;
f0706e82 JB	252	}
	253
	254	/* remove all STAs that are bound to this virtual interface */
	255	sta_info_flush(local, dev);
	256
	257	memset(&sdata->u, 0, sizeof(sdata->u));
	258	ieee80211_if_sdata_init(sdata);
	259	}
	260
	261	/* Must be called with rtnl lock held. */
	262	void __ieee80211_if_del(struct ieee80211_local *local,
	263	struct ieee80211_sub_if_data *sdata)
	264	{
	265	struct net_device *dev = sdata->dev;
	266
e9f207f0	267	ieee80211_debugfs_remove_netdev(sdata);
f0706e82 JB	268	unregister_netdevice(dev);
	269	/* Except master interface, the net_device will be freed by
	270	* net_device->destructor (i. e. ieee80211_if_free). */
	271	}
	272
	273	/* Must be called with rtnl lock held. */
	274	int ieee80211_if_remove(struct net_device dev, const char name, int id)
	275	{
	276	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	277	struct ieee80211_sub_if_data sdata, n;
	278
	279	ASSERT_RTNL();
	280
79010420	281	list_for_each_entry_safe(sdata, n, &local->interfaces, list) {
51fb61e7	282	if ((sdata->vif.type == id \|\| id == -1) &&
f0706e82 JB	283	strcmp(name, sdata->dev->name) == 0 &&
f0706e82 JB	284	sdata->dev != local->mdev) {
79010420 JB	285	list_del_rcu(&sdata->list);
79010420 JB	286	synchronize_rcu();
f0706e82	287	__ieee80211_if_del(local, sdata);
f0706e82 JB	288	return 0;
	289	}
	290	}
f0706e82 JB	291	return -ENODEV;
	292	}
	293
	294	void ieee80211_if_free(struct net_device *dev)
	295	{
f0706e82 JB	296	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
f0706e82 JB	297
f0706e82 JB	298	ieee80211_if_sdata_deinit(sdata);
	299	free_netdev(dev);
	300	}