Commit 53873f13 authored by Johannes Berg's avatar Johannes Berg
Browse files

cfg80211: make wdev_list accessible to drivers 



There's no harm in having drivers read the list, since they can
use RCU protection or RTNL locking; allow this to not require
each and every driver to also implement its own bookkeeping.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 8b9b2f06

include/net/cfg80211.h

+5 −0
Original line number Diff line number Diff line
@@ -3189,6 +3189,9 @@ struct wiphy_vendor_command { 
 * @vht_capa_mod_mask:  Specify what VHT capabilities can be over-ridden.

 *	If null, then none can be over-ridden.

 *

 * @wdev_list: the list of associated (virtual) interfaces; this list must

 *	not be modified by the driver, but can be read with RTNL/RCU protection.

 *

 * @max_acl_mac_addrs: Maximum number of MAC addresses that the device

 *	supports for ACL.

 *
@@ -3328,6 +3331,8 @@ struct wiphy { 
	const struct ieee80211_ht_cap *ht_capa_mod_mask;

	const struct ieee80211_vht_cap *vht_capa_mod_mask;



	struct list_head wdev_list;



	/* the network namespace this phy lives in currently */

	possible_net_t _net;

net/wireless/chan.c

+1 −1
Original line number Diff line number Diff line
@@ -739,7 +739,7 @@ static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 
	 * and thus fail the GO instantiation, consider only the interfaces of

	 * the current registered device.

	 */

	list_for_each_entry(wdev, &rdev->wdev_list, list) {

	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {

		struct ieee80211_channel *other_chan = NULL;

		int r1, r2;

net/wireless/core.c

+10 −7
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
 *

 * Copyright 2006-2010		Johannes Berg <johannes@sipsolutions.net>

 * Copyright 2013-2014  Intel Mobile Communications GmbH

 * Copyright 2015	Intel Deutschland GmbH

 */



#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -157,7 +158,7 @@ int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 
	if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))

		return -EOPNOTSUPP;



	list_for_each_entry(wdev, &rdev->wdev_list, list) {

	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {

		if (!wdev->netdev)

			continue;

		wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
@@ -171,7 +172,8 @@ int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, 
		/* failed -- clean up to old netns */

		net = wiphy_net(&rdev->wiphy);



		list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,

		list_for_each_entry_continue_reverse(wdev,

						     &rdev->wiphy.wdev_list,

						     list) {

			if (!wdev->netdev)

				continue;
@@ -230,7 +232,7 @@ void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) 


	ASSERT_RTNL();



	list_for_each_entry(wdev, &rdev->wdev_list, list) {

	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {

		if (wdev->netdev) {

			dev_close(wdev->netdev);

			continue;
@@ -298,7 +300,8 @@ void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) 
		kfree(item);

		spin_unlock_irq(&rdev->destroy_list_lock);



		list_for_each_entry_safe(wdev, tmp, &rdev->wdev_list, list) {

		list_for_each_entry_safe(wdev, tmp,

					 &rdev->wiphy.wdev_list, list) {

			if (nlportid == wdev->owner_nlportid)

				rdev_del_virtual_intf(rdev, wdev);

		}
@@ -410,7 +413,7 @@ use_default_name: 
		dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);

	}



	INIT_LIST_HEAD(&rdev->wdev_list);

	INIT_LIST_HEAD(&rdev->wiphy.wdev_list);

	INIT_LIST_HEAD(&rdev->beacon_registrations);

	spin_lock_init(&rdev->beacon_registrations_lock);

	spin_lock_init(&rdev->bss_lock);
@@ -799,7 +802,7 @@ void wiphy_unregister(struct wiphy *wiphy) 
	nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);

	rdev->wiphy.registered = false;



	WARN_ON(!list_empty(&rdev->wdev_list));

	WARN_ON(!list_empty(&rdev->wiphy.wdev_list));



	/*

	 * First remove the hardware from everywhere, this makes
@@ -1021,7 +1024,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb, 
		spin_lock_init(&wdev->mgmt_registrations_lock);



		wdev->identifier = ++rdev->wdev_id;

		list_add_rcu(&wdev->list, &rdev->wdev_list);

		list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);

		rdev->devlist_generation++;

		/* can only change netns with wiphy */

		dev->features |= NETIF_F_NETNS_LOCAL;

net/wireless/core.h

+1 −2
Original line number Diff line number Diff line
@@ -50,8 +50,7 @@ struct cfg80211_registered_device { 
	/* wiphy index, internal only */

	int wiphy_idx;



	/* associated wireless interfaces, protected by rtnl or RCU */

	struct list_head wdev_list;

	/* protected by RTNL */

	int devlist_generation, wdev_id;

	int opencount;

	wait_queue_head_t dev_wait;

net/wireless/nl80211.c

+8 −8
Original line number Diff line number Diff line
@@ -103,7 +103,7 @@ __cfg80211_wdev_from_attrs(struct net *netns, struct nlattr **attrs) 
		if (have_wdev_id && rdev->wiphy_idx != wiphy_idx)

			continue;



		list_for_each_entry(wdev, &rdev->wdev_list, list) {

		list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {

			if (have_ifidx && wdev->netdev &&

			    wdev->netdev->ifindex == ifidx) {

				result = wdev;
@@ -149,7 +149,7 @@ __cfg80211_rdev_from_attrs(struct net *netns, struct nlattr **attrs) 
		tmp = cfg80211_rdev_by_wiphy_idx(wdev_id >> 32);

		if (tmp) {

			/* make sure wdev exists */

			list_for_each_entry(wdev, &tmp->wdev_list, list) {

			list_for_each_entry(wdev, &tmp->wiphy.wdev_list, list) {

				if (wdev->identifier != (u32)wdev_id)

					continue;

				found = true;
@@ -535,7 +535,7 @@ static int nl80211_prepare_wdev_dump(struct sk_buff *skb, 
		*rdev = wiphy_to_rdev(wiphy);

		*wdev = NULL;



		list_for_each_entry(tmp, &(*rdev)->wdev_list, list) {

		list_for_each_entry(tmp, &(*rdev)->wiphy.wdev_list, list) {

			if (tmp->identifier == cb->args[1]) {

				*wdev = tmp;

				break;
@@ -2490,7 +2490,7 @@ static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback * 
		}

		if_idx = 0;



		list_for_each_entry(wdev, &rdev->wdev_list, list) {

		list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {

			if (if_idx < if_start) {

				if_idx++;

				continue;
@@ -2762,7 +2762,7 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info) 
		spin_lock_init(&wdev->mgmt_registrations_lock);



		wdev->identifier = ++rdev->wdev_id;

		list_add_rcu(&wdev->list, &rdev->wdev_list);

		list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);

		rdev->devlist_generation++;

		break;

	default:
@@ -3298,7 +3298,7 @@ static bool nl80211_get_ap_channel(struct cfg80211_registered_device *rdev, 
	struct wireless_dev *wdev;

	bool ret = false;



	list_for_each_entry(wdev, &rdev->wdev_list, list) {

	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {

		if (wdev->iftype != NL80211_IFTYPE_AP &&

		    wdev->iftype != NL80211_IFTYPE_P2P_GO)

			continue;
@@ -10392,7 +10392,7 @@ static int nl80211_prepare_vendor_dump(struct sk_buff *skb, 
		*wdev = NULL;



		if (cb->args[1]) {

			list_for_each_entry(tmp, &(*rdev)->wdev_list, list) {

			list_for_each_entry(tmp, &wiphy->wdev_list, list) {

				if (tmp->identifier == cb->args[1] - 1) {

					*wdev = tmp;

					break;
@@ -13413,7 +13413,7 @@ static int nl80211_netlink_notify(struct notifier_block * nb, 
		    sched_scan_req->owner_nlportid == notify->portid)

			schedule_scan_stop = true;



		list_for_each_entry_rcu(wdev, &rdev->wdev_list, list) {

		list_for_each_entry_rcu(wdev, &rdev->wiphy.wdev_list, list) {

			cfg80211_mlme_unregister_socket(wdev, notify->portid);



			if (wdev->owner_nlportid == notify->portid)

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