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Commit 6a671a50 authored by Denis Kenzior's avatar Denis Kenzior Committed by Johannes Berg
Browse files

nl80211: Add CMD_CONTROL_PORT_FRAME API 



This commit also adds cfg80211_rx_control_port function.  This is used
to generate a CMD_CONTROL_PORT_FRAME event out to userspace.  The
conn_owner_nlportid is used as the unicast destination.  This means that
userspace must specify NL80211_ATTR_SOCKET_OWNER flag if control port
over nl80211 routing is requested in NL80211_CMD_CONNECT,
NL80211_CMD_ASSOCIATE, NL80211_CMD_START_AP or IBSS/mesh join.

Signed-off-by: default avatarDenis Kenzior <denkenz@gmail.com>
[johannes: fix return value of cfg80211_rx_control_port()]
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 4d191c75

include/net/cfg80211.h

+22 −0
Original line number Diff line number Diff line
@@ -5721,6 +5721,28 @@ void cfg80211_mgmt_tx_status(struct wireless_dev *wdev, u64 cookie, 
			     const u8 *buf, size_t len, bool ack, gfp_t gfp);





/**

 * cfg80211_rx_control_port - notification about a received control port frame

 * @dev: The device the frame matched to

 * @buf: control port frame

 * @len: length of the frame data

 * @addr: The peer from which the frame was received

 * @proto: frame protocol, typically PAE or Pre-authentication

 * @unencrypted: Whether the frame was received unencrypted

 *

 * This function is used to inform userspace about a received control port

 * frame.  It should only be used if userspace indicated it wants to receive

 * control port frames over nl80211.

 *

 * The frame is the data portion of the 802.3 or 802.11 data frame with all

 * network layer headers removed (e.g. the raw EAPoL frame).

 *

 * Return: %true if the frame was passed to userspace

 */

bool cfg80211_rx_control_port(struct net_device *dev,

			      const u8 *buf, size_t len,

			      const u8 *addr, u16 proto, bool unencrypted);



/**

 * cfg80211_cqm_rssi_notify - connection quality monitoring rssi event

 * @dev: network device

include/uapi/linux/nl80211.h

+13 −0
Original line number Diff line number Diff line
@@ -990,6 +990,17 @@ 
 *	&NL80211_CMD_CONNECT or &NL80211_CMD_ROAM. If the 4 way handshake failed

 *	&NL80211_CMD_DISCONNECT should be indicated instead.

 *

 * @NL80211_CMD_CONTROL_PORT_FRAME: Control Port (e.g. PAE) frame TX request

 *	and RX notification.  This command is used both as a request to transmit

 *	a control port frame and as a notification that a control port frame

 *	has been received. %NL80211_ATTR_FRAME is used to specify the

 *	frame contents.  The frame is the raw EAPoL data, without ethernet or

 *	802.11 headers.

 *	When used as an event indication %NL80211_ATTR_CONTROL_PORT_ETHERTYPE,

 *	%NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT and %NL80211_ATTR_MAC are added

 *	indicating the protocol type of the received frame; whether the frame

 *	was received unencrypted and the MAC address of the peer respectively.

 *

 * @NL80211_CMD_RELOAD_REGDB: Request that the regdb firmware file is reloaded.

 *

 * @NL80211_CMD_EXTERNAL_AUTH: This interface is exclusively defined for host
@@ -1228,6 +1239,8 @@ enum nl80211_commands { 


	NL80211_CMD_STA_OPMODE_CHANGED,



	NL80211_CMD_CONTROL_PORT_FRAME,



	/* add new commands above here */



	/* used to define NL80211_CMD_MAX below */

net/wireless/nl80211.c

+58 −0
Original line number Diff line number Diff line
@@ -14553,6 +14553,64 @@ void cfg80211_mgmt_tx_status(struct wireless_dev *wdev, u64 cookie, 
}

EXPORT_SYMBOL(cfg80211_mgmt_tx_status);



static int __nl80211_rx_control_port(struct net_device *dev,

				     const u8 *buf, size_t len,

				     const u8 *addr, u16 proto,

				     bool unencrypted, gfp_t gfp)

{

	struct wireless_dev *wdev = dev->ieee80211_ptr;

	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

	struct sk_buff *msg;

	void *hdr;

	u32 nlportid = READ_ONCE(wdev->conn_owner_nlportid);



	if (!nlportid)

		return -ENOENT;



	msg = nlmsg_new(100 + len, gfp);

	if (!msg)

		return -ENOMEM;



	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_CONTROL_PORT_FRAME);

	if (!hdr) {

		nlmsg_free(msg);

		return -ENOBUFS;

	}



	if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||

	    nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex) ||

	    nla_put_u64_64bit(msg, NL80211_ATTR_WDEV, wdev_id(wdev),

			      NL80211_ATTR_PAD) ||

	    nla_put(msg, NL80211_ATTR_FRAME, len, buf) ||

	    nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, addr) ||

	    nla_put_u16(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE, proto) ||

	    (unencrypted && nla_put_flag(msg,

					 NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT)))

		goto nla_put_failure;



	genlmsg_end(msg, hdr);



	return genlmsg_unicast(wiphy_net(&rdev->wiphy), msg, nlportid);



 nla_put_failure:

	nlmsg_free(msg);

	return -ENOBUFS;

}



bool cfg80211_rx_control_port(struct net_device *dev,

			      const u8 *buf, size_t len,

			      const u8 *addr, u16 proto, bool unencrypted)

{

	int ret;



	trace_cfg80211_rx_control_port(dev, buf, len, addr, proto, unencrypted);

	ret = __nl80211_rx_control_port(dev, buf, len, addr, proto,

					unencrypted, GFP_ATOMIC);

	trace_cfg80211_return_bool(ret == 0);

	return ret == 0;

}

EXPORT_SYMBOL(cfg80211_rx_control_port);



static struct sk_buff *cfg80211_prepare_cqm(struct net_device *dev,

					    const char *mac, gfp_t gfp)

{

net/wireless/trace.h

+21 −0
Original line number Diff line number Diff line
@@ -2600,6 +2600,27 @@ TRACE_EVENT(cfg80211_mgmt_tx_status, 
		  WDEV_PR_ARG, __entry->cookie, BOOL_TO_STR(__entry->ack))

);



TRACE_EVENT(cfg80211_rx_control_port,

	TP_PROTO(struct net_device *netdev, const u8 *buf, size_t len,

		 const u8 *addr, u16 proto, bool unencrypted),

	TP_ARGS(netdev, buf, len, addr, proto, unencrypted),

	TP_STRUCT__entry(

		NETDEV_ENTRY

		MAC_ENTRY(addr)

		__field(u16, proto)

		__field(bool, unencrypted)

	),

	TP_fast_assign(

		NETDEV_ASSIGN;

		MAC_ASSIGN(addr, addr);

		__entry->proto = proto;

		__entry->unencrypted = unencrypted;

	),

	TP_printk(NETDEV_PR_FMT ", " MAC_PR_FMT " proto: 0x%x, unencrypted: %s",

		  NETDEV_PR_ARG, MAC_PR_ARG(addr),

		  __entry->proto, BOOL_TO_STR(__entry->unencrypted))

);



TRACE_EVENT(cfg80211_cqm_rssi_notify,

	TP_PROTO(struct net_device *netdev,

		 enum nl80211_cqm_rssi_threshold_event rssi_event,