Commit 2576a9ac authored by Denis Kenzior's avatar Denis Kenzior Committed by Johannes Berg
Browse files

nl80211: Implement TX of control port frames 



This commit implements the TX side of NL80211_CMD_CONTROL_PORT_FRAME.
Userspace provides the raw EAPoL frame using NL80211_ATTR_FRAME.
Userspace should also provide the destination address and the protocol
type to use when sending the frame.  This is used to implement TX of
Pre-authentication frames.  If CONTROL_PORT_ETHERTYPE_NO_ENCRYPT is
specified, then the driver will be asked not to encrypt the outgoing
frame.

A new EXT_FEATURE flag is introduced so that nl80211 code can check
whether a given wiphy has capability to pass EAPoL frames over nl80211.

Signed-off-by: default avatarDenis Kenzior <denkenz@gmail.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 6a671a50

include/net/cfg80211.h

+9 −0
Original line number Diff line number Diff line
@@ -2961,6 +2961,9 @@ struct cfg80211_external_auth_params { 
 *

 * @external_auth: indicates result of offloaded authentication processing from

 *     user space

 *

 * @tx_control_port: TX a control port frame (EAPoL).  The noencrypt parameter

 *	tells the driver that the frame should not be encrypted.

 */

struct cfg80211_ops {

	int	(*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -3256,6 +3259,12 @@ struct cfg80211_ops { 
			   const u8 *aa);

	int     (*external_auth)(struct wiphy *wiphy, struct net_device *dev,

				 struct cfg80211_external_auth_params *params);



	int	(*tx_control_port)(struct wiphy *wiphy,

				   struct net_device *dev,

				   const u8 *buf, size_t len,

				   const u8 *dest, const __be16 proto,

				   const bool noencrypt);

};



/*

include/uapi/linux/nl80211.h

+3 −0
Original line number Diff line number Diff line
@@ -5024,6 +5024,8 @@ enum nl80211_feature_flags { 
 *	channel change triggered by radar detection event.

 *	No need to start CAC from user-space, no need to react to

 *	"radar detected" event.

 * @NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211: Driver supports sending and

 *	receiving control port frames over nl80211 instead of the netdevice.

 *

 * @NUM_NL80211_EXT_FEATURES: number of extended features.

 * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
@@ -5055,6 +5057,7 @@ enum nl80211_ext_feature_index { 
	NL80211_EXT_FEATURE_LOW_POWER_SCAN,

	NL80211_EXT_FEATURE_HIGH_ACCURACY_SCAN,

	NL80211_EXT_FEATURE_DFS_OFFLOAD,

	NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211,



	/* add new features before the definition below */

	NUM_NL80211_EXT_FEATURES,

net/wireless/nl80211.c

+70 −1
Original line number Diff line number Diff line
@@ -12535,6 +12535,68 @@ static int nl80211_external_auth(struct sk_buff *skb, struct genl_info *info) 
	return rdev_external_auth(rdev, dev, &params);

}



static int nl80211_tx_control_port(struct sk_buff *skb, struct genl_info *info)

{

	struct cfg80211_registered_device *rdev = info->user_ptr[0];

	struct net_device *dev = info->user_ptr[1];

	struct wireless_dev *wdev = dev->ieee80211_ptr;

	const u8 *buf;

	size_t len;

	u8 *dest;

	u16 proto;

	bool noencrypt;

	int err;



	if (!wiphy_ext_feature_isset(&rdev->wiphy,

				     NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211))

		return -EOPNOTSUPP;



	if (!rdev->ops->tx_control_port)

		return -EOPNOTSUPP;



	if (!info->attrs[NL80211_ATTR_FRAME] ||

	    !info->attrs[NL80211_ATTR_MAC] ||

	    !info->attrs[NL80211_ATTR_CONTROL_PORT_ETHERTYPE]) {

		GENL_SET_ERR_MSG(info, "Frame, MAC or ethertype missing");

		return -EINVAL;

	}



	wdev_lock(wdev);



	switch (wdev->iftype) {

	case NL80211_IFTYPE_AP:

	case NL80211_IFTYPE_P2P_GO:

	case NL80211_IFTYPE_MESH_POINT:

		break;

	case NL80211_IFTYPE_ADHOC:

	case NL80211_IFTYPE_STATION:

	case NL80211_IFTYPE_P2P_CLIENT:

		if (wdev->current_bss)

			break;

		err = -ENOTCONN;

		goto out;

	default:

		err = -EOPNOTSUPP;

		goto out;

	}



	wdev_unlock(wdev);



	buf = nla_data(info->attrs[NL80211_ATTR_FRAME]);

	len = nla_len(info->attrs[NL80211_ATTR_FRAME]);

	dest = nla_data(info->attrs[NL80211_ATTR_MAC]);

	proto = nla_get_u16(info->attrs[NL80211_ATTR_CONTROL_PORT_ETHERTYPE]);

	noencrypt =

		nla_get_flag(info->attrs[NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT]);



	return rdev_tx_control_port(rdev, dev, buf, len,

				    dest, cpu_to_be16(proto), noencrypt);



 out:

	wdev_unlock(wdev);

	return err;

}



#define NL80211_FLAG_NEED_WIPHY		0x01

#define NL80211_FLAG_NEED_NETDEV	0x02

#define NL80211_FLAG_NEED_RTNL		0x04
@@ -13438,7 +13500,14 @@ static const struct genl_ops nl80211_ops[] = { 
		.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |

				  NL80211_FLAG_NEED_RTNL,

	},



	{

		.cmd = NL80211_CMD_CONTROL_PORT_FRAME,

		.doit = nl80211_tx_control_port,

		.policy = nl80211_policy,

		.flags = GENL_UNS_ADMIN_PERM,

		.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |

				  NL80211_FLAG_NEED_RTNL,

	},

};



static struct genl_family nl80211_fam __ro_after_init = {

net/wireless/rdev-ops.h

+15 −0
Original line number Diff line number Diff line
@@ -714,6 +714,21 @@ static inline int rdev_mgmt_tx(struct cfg80211_registered_device *rdev, 
	return ret;

}



static inline int rdev_tx_control_port(struct cfg80211_registered_device *rdev,

				       struct net_device *dev,

				       const void *buf, size_t len,

				       const u8 *dest, __be16 proto,

				       const bool noencrypt)

{

	int ret;

	trace_rdev_tx_control_port(&rdev->wiphy, dev, buf, len,

				   dest, proto, noencrypt);

	ret = rdev->ops->tx_control_port(&rdev->wiphy, dev, buf, len,

					 dest, proto, noencrypt);

	trace_rdev_return_int(&rdev->wiphy, ret);

	return ret;

}



static inline int

rdev_mgmt_tx_cancel_wait(struct cfg80211_registered_device *rdev,

			 struct wireless_dev *wdev, u64 cookie)

net/wireless/trace.h

+26 −0
Original line number Diff line number Diff line
@@ -1882,6 +1882,32 @@ TRACE_EVENT(rdev_mgmt_tx, 
		  BOOL_TO_STR(__entry->dont_wait_for_ack))

);



TRACE_EVENT(rdev_tx_control_port,

	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev,

		 const u8 *buf, size_t len, const u8 *dest, __be16 proto,

		 bool unencrypted),

	TP_ARGS(wiphy, netdev, buf, len, dest, proto, unencrypted),

	TP_STRUCT__entry(

		WIPHY_ENTRY

		NETDEV_ENTRY

		MAC_ENTRY(dest)

		__field(__be16, proto)

		__field(bool, unencrypted)

	),

	TP_fast_assign(

		WIPHY_ASSIGN;

		NETDEV_ASSIGN;

		MAC_ASSIGN(dest, dest);

		__entry->proto = proto;

		__entry->unencrypted = unencrypted;

	),

	TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", " MAC_PR_FMT ","

		  " proto: 0x%x, unencrypted: %s",

		  WIPHY_PR_ARG, NETDEV_PR_ARG, MAC_PR_ARG(dest),

		  be16_to_cpu(__entry->proto),

		  BOOL_TO_STR(__entry->unencrypted))

);



TRACE_EVENT(rdev_set_noack_map,

	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev,

		 u16 noack_map),

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