net/mac80211/iface.c - linux - Git at Google

 /*
  * 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"
 #include "mesh.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 vif_params *params)
 {
 	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;

 	ndev->needed_headroom = local->tx_headroom +
 				4*6 /* four MAC addresses */
 				+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 				+ 6 /* mesh */
 				+ 8 /* rfc1042/bridge tunnel */
 				- ETH_HLEN /* ethernet hard_header_len */
 				+ IEEE80211_ENCRYPT_HEADROOM;
 	ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;

 	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);

 	if (ieee80211_vif_is_mesh(&sdata->vif) &&
 	    params && params->mesh_id_len)
 		ieee80211_if_sta_set_mesh_id(&sdata->u.sta,
 					     params->mesh_id_len,
 					     params->mesh_id);

 	/* 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_MESH_POINT:
 	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_AUTO_BSSID_SEL |
 			IEEE80211_STA_AUTO_CHANNEL_SEL;
 		if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
 			ifsta->flags |= IEEE80211_STA_WMM_ENABLED;

 		msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 		sdata->bss = &msdata->u.ap;

 		if (ieee80211_vif_is_mesh(&sdata->vif))
 			ieee80211_mesh_init_sdata(sdata);
 		break;
 	}
 	case IEEE80211_IF_TYPE_MNTR:
 		dev->type = ARPHRD_IEEE80211_RADIOTAP;
 		dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 		sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 				      MONITOR_FLAG_OTHER_BSS;
 		break;
 	case IEEE80211_IF_TYPE_INVALID:
 		BUG();
 		break;
 	}
 	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 sk_buff *skb;
 	int flushed;

 	ASSERT_RTNL();

 	ieee80211_free_keys(sdata);

 	ieee80211_if_sdata_deinit(sdata);

 	/* Need to handle mesh specially to allow eliding the function call */
 	if (ieee80211_vif_is_mesh(&sdata->vif))
 		mesh_rmc_free(dev);

 	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;
 		struct beacon_data *beacon;

 		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);
 			}
 		}

 		beacon = sdata->u.ap.beacon;
 		rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 		synchronize_rcu();
 		kfree(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:
 		/* nothing to do */
 		break;
 	case IEEE80211_IF_TYPE_MESH_POINT:
 	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;
 	}

 	flushed = sta_info_flush(local, sdata);
 	WARN_ON(flushed);

 	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);
 }
	/*
	* 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"
	#include "mesh.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 vif_params *params)
	{
	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;

	ndev->needed_headroom = local->tx_headroom +
	46 / four MAC addresses */
	+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
	+ 6 /* mesh */
	+ 8 /* rfc1042/bridge tunnel */
	- ETH_HLEN /* ethernet hard_header_len */
	+ IEEE80211_ENCRYPT_HEADROOM;
	ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;

	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);

	if (ieee80211_vif_is_mesh(&sdata->vif) &&
	params && params->mesh_id_len)
	ieee80211_if_sta_set_mesh_id(&sdata->u.sta,
	params->mesh_id_len,
	params->mesh_id);

	/* 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_MESH_POINT:
	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_AUTO_BSSID_SEL \|
	IEEE80211_STA_AUTO_CHANNEL_SEL;
	if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
	ifsta->flags \|= IEEE80211_STA_WMM_ENABLED;

	msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
	sdata->bss = &msdata->u.ap;

	if (ieee80211_vif_is_mesh(&sdata->vif))
	ieee80211_mesh_init_sdata(sdata);
	break;
	}
	case IEEE80211_IF_TYPE_MNTR:
	dev->type = ARPHRD_IEEE80211_RADIOTAP;
	dev->hard_start_xmit = ieee80211_monitor_start_xmit;
	sdata->u.mntr_flags = MONITOR_FLAG_CONTROL \|
	MONITOR_FLAG_OTHER_BSS;
	break;
	case IEEE80211_IF_TYPE_INVALID:
	BUG();
	break;
	}
	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 sk_buff *skb;
	int flushed;

	ASSERT_RTNL();

	ieee80211_free_keys(sdata);

	ieee80211_if_sdata_deinit(sdata);

	/* Need to handle mesh specially to allow eliding the function call */
	if (ieee80211_vif_is_mesh(&sdata->vif))
	mesh_rmc_free(dev);

	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;
	struct beacon_data *beacon;

	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);
	}
	}

	beacon = sdata->u.ap.beacon;
	rcu_assign_pointer(sdata->u.ap.beacon, NULL);
	synchronize_rcu();
	kfree(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:
	/* nothing to do */
	break;
	case IEEE80211_IF_TYPE_MESH_POINT:
	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;
	}

	flushed = sta_info_flush(local, sdata);
	WARN_ON(flushed);

	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);
	}