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 or
NL80211_CMD_ASSOCIATE
Signed-off-by: Denis Kenzior <denkenz@xxxxxxxxx>
---
include/net/cfg80211.h | 15 +++++++++++
include/uapi/linux/nl80211.h | 15 +++++++++++
net/wireless/nl80211.c | 62 ++++++++++++++++++++++++++++++++++++++++++++
net/wireless/trace.h | 15 +++++++++++
4 files changed, 107 insertions(+)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 0aa1c866a73b..cc480e252367 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -5626,6 +5626,21 @@ void cfg80211_mgmt_tx_status(struct wireless_dev *wdev, u64 cookie,
/**
+ * cfg80211_rx_control_port - inform userspace about a received control port
+ * frame, e.g. EAPoL. This is used if userspace has specified it wants to
+ * receive control port frames over NL80211.
+ * @dev: The device the frame matched to
+ * @buf: control port frame
+ * @len: length of the frame data
+ * @unencrypted: Whether the frame was received unencrypted
+ *
+ * Return: %true if the frame was passed to userspace
+ */
+bool cfg80211_rx_control_port(struct wireless_dev *wdev,
+ 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
* @rssi_event: the triggered RSSI event
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 8855b7eaf92c..b902614e876e 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -991,6 +991,17 @@
* &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_MAX: highest used command number
@@ -1199,6 +1210,8 @@ enum nl80211_commands {
NL80211_CMD_RELOAD_REGDB,
+ NL80211_CMD_CONTROL_PORT_FRAME,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
@@ -1446,6 +1459,8 @@ enum nl80211_commands {
* @NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT: When included along with
* %NL80211_ATTR_CONTROL_PORT_ETHERTYPE, indicates that the custom
* ethertype frames used for key negotiation must not be encrypted.
+ * When included in %NL80211_CMD_CONTROL_PORT_FRAME it means that the
+ * control port frame was received unencrypted.
* @NL80211_ATTR_CONTROL_PORT_OVER_NL80211: A flag indicating whether control
* port frames (e.g. of type given in %NL80211_ATTR_CONTROL_PORT_ETHERTYPE)
* will be sent directly to the network interface or sent via the NL80211
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index f5b4008f40da..220fe5bc57fd 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -14490,6 +14490,68 @@ void cfg80211_mgmt_tx_status(struct wireless_dev *wdev, u64 cookie,
}
EXPORT_SYMBOL(cfg80211_mgmt_tx_status);
+static int __nl80211_control_port(struct cfg80211_registered_device *rdev,
+ struct wireless_dev *wdev,
+ const u8 *buf, size_t len,
+ const u8 *addr, u16 proto,
+ bool unencrypted, gfp_t gfp)
+{
+ struct net_device *netdev = wdev->netdev;
+ 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 -ENOMEM;
+ }
+
+ if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
+ (netdev && nla_put_u32(msg, NL80211_ATTR_IFINDEX,
+ netdev->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:
+ genlmsg_cancel(msg, hdr);
+ nlmsg_free(msg);
+ return -ENOBUFS;
+}
+
+bool cfg80211_rx_control_port(struct wireless_dev *wdev,
+ const u8 *buf, size_t len,
+ const u8 *addr, u16 proto, bool unencrypted)
+{
+ struct wiphy *wiphy = wdev->wiphy;
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+ bool ret;
+
+ trace_cfg80211_rx_control_port(wdev, unencrypted);
+ ret = __nl80211_control_port(rdev, wdev, buf, len, addr, proto,
+ unencrypted, GFP_ATOMIC);
+ trace_cfg80211_return_bool(ret);
+ return ret;
+}
+EXPORT_SYMBOL(cfg80211_rx_control_port);
+
static struct sk_buff *cfg80211_prepare_cqm(struct net_device *dev,
const char *mac, gfp_t gfp)
{
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index bcfedd39e7a3..1703a0fa315b 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -2577,6 +2577,21 @@ 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 wireless_dev *wdev, bool unencrypted),
+ TP_ARGS(wdev, unencrypted),
+ TP_STRUCT__entry(
+ WDEV_ENTRY
+ __field(bool, unencrypted)
+ ),
+ TP_fast_assign(
+ WDEV_ASSIGN;
+ __entry->unencrypted = unencrypted;
+ ),
+ TP_printk(WDEV_PR_FMT", unencrypted: %s",
+ WDEV_PR_ARG, 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,
--
2.13.5
