cfg80211: Report Association Request frame IEs in association events

This extends the NL80211_CMD_ASSOCIATE event case to report
NL80211_ATTR_REQ_IE similarly to what is already done with the
NL80211_CMD_CONNECT events if the driver provides this information. In
practice, this adds (Re)Association Request frame information element
reporting to mac80211 drivers for the cases where user space SME is
used.

This provides more information for user space to figure out which
capabilities were negotiated for the association. For example, this can
be used to determine whether HT, VHT, or HE is used.

Signed-off-by: Jouni Malinen <[e-mail]>
Signed-off-by: Johannes Berg <[e-mail]>

include/net/cfg80211.h

···
  * @dev: network device
  * @bss: the BSS that association was requested with, ownership of the pointer
  *	moves to cfg80211 in this call
- * @buf: authentication frame (header + body)
+ * @buf: (Re)Association Response frame (header + body)
  * @len: length of the frame data
  * @uapsd_queues: bitmap of queues configured for uapsd. Same format
  *	as the AC bitmap in the QoS info field
+ * @req_ies: information elements from the (Re)Association Request frame
+ * @req_ies_len: length of req_ies data
  *
  * After being asked to associate via cfg80211_ops::assoc() the driver must
  * call either this function or cfg80211_auth_timeout().
···
 void cfg80211_rx_assoc_resp(struct net_device *dev,
 			    struct cfg80211_bss *bss,
 			    const u8 *buf, size_t len,
-			    int uapsd_queues);
+			    int uapsd_queues,
+			    const u8 *req_ies, size_t req_ies_len);
 
 /**
  * cfg80211_assoc_timeout - notification of timed out association

net/mac80211/ieee80211_i.h

···
 	 * get stuck in a downgraded situation and flush takes forever.
 	 */
 	struct delayed_work tx_tspec_wk;
+
+	/* Information elements from the last transmitted (Re)Association
+	 * Request frame.
+	 */
+	u8 *assoc_req_ies;
+	size_t assoc_req_ies_len;
 };
 
 struct ieee80211_if_ibss {

net/mac80211/mlme.c

···
 	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 	struct sk_buff *skb;
 	struct ieee80211_mgmt *mgmt;
-	u8 *pos, qos_info;
+	u8 *pos, qos_info, *ie_start;
 	size_t offset = 0, noffset;
 	int i, count, rates_len, supp_rates_len, shift;
 	u16 capab;
···
 
 	/* SSID */
 	pos = skb_put(skb, 2 + assoc_data->ssid_len);
+	ie_start = pos;
 	*pos++ = WLAN_EID_SSID;
 	*pos++ = assoc_data->ssid_len;
 	memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
···
 		dev_kfree_skb(skb);
 		return;
 	}
+
+	pos = skb_tail_pointer(skb);
+	kfree(ifmgd->assoc_req_ies);
+	ifmgd->assoc_req_ies = kmemdup(ie_start, pos - ie_start, GFP_ATOMIC);
+	ifmgd->assoc_req_ies_len = pos - ie_start;
 
 	drv_mgd_prepare_tx(local, sdata, 0);
 
···
 				uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
 	}
 
-	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
+	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues,
+			       ifmgd->assoc_req_ies, ifmgd->assoc_req_ies_len);
 }
 
 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
···
 		ifmgd->teardown_skb = NULL;
 		ifmgd->orig_teardown_skb = NULL;
 	}
+	kfree(ifmgd->assoc_req_ies);
+	ifmgd->assoc_req_ies = NULL;
+	ifmgd->assoc_req_ies_len = 0;
 	spin_unlock_bh(&ifmgd->teardown_lock);
 	del_timer_sync(&ifmgd->timer);
 	sdata_unlock(sdata);

net/wireless/mlme.c

···
 
 
 void cfg80211_rx_assoc_resp(struct net_device *dev, struct cfg80211_bss *bss,
-			    const u8 *buf, size_t len, int uapsd_queues)
+			    const u8 *buf, size_t len, int uapsd_queues,
+			    const u8 *req_ies, size_t req_ies_len)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct wiphy *wiphy = wdev->wiphy;
···
 	cr.status = (int)le16_to_cpu(mgmt->u.assoc_resp.status_code);
 	cr.bssid = mgmt->bssid;
 	cr.bss = bss;
+	cr.req_ie = req_ies;
+	cr.req_ie_len = req_ies_len;
 	cr.resp_ie = mgmt->u.assoc_resp.variable;
 	cr.resp_ie_len =
 		len - offsetof(struct ieee80211_mgmt, u.assoc_resp.variable);
···
 		return;
 	}
 
-	nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL, uapsd_queues);
+	nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL, uapsd_queues,
+			      req_ies, req_ies_len);
 	/* update current_bss etc., consumes the bss reference */
 	__cfg80211_connect_result(dev, &cr, cr.status == WLAN_STATUS_SUCCESS);
 }

net/wireless/nl80211.c

···
 				    struct net_device *netdev,
 				    const u8 *buf, size_t len,
 				    enum nl80211_commands cmd, gfp_t gfp,
-				    int uapsd_queues)
+				    int uapsd_queues, const u8 *req_ies,
+				    size_t req_ies_len)
 {
 	struct sk_buff *msg;
 	void *hdr;
 
-	msg = nlmsg_new(100 + len, gfp);
+	msg = nlmsg_new(100 + len + req_ies_len, gfp);
 	if (!msg)
 		return;
 
···
 
 	if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
 	    nla_put_u32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex) ||
-	    nla_put(msg, NL80211_ATTR_FRAME, len, buf))
+	    nla_put(msg, NL80211_ATTR_FRAME, len, buf) ||
+	    (req_ies &&
+	     nla_put(msg, NL80211_ATTR_REQ_IE, req_ies_len, req_ies)))
 		goto nla_put_failure;
 
 	if (uapsd_queues >= 0) {
···
 			  size_t len, gfp_t gfp)
 {
 	nl80211_send_mlme_event(rdev, netdev, buf, len,
-				NL80211_CMD_AUTHENTICATE, gfp, -1);
+				NL80211_CMD_AUTHENTICATE, gfp, -1, NULL, 0);
 }
 
 void nl80211_send_rx_assoc(struct cfg80211_registered_device *rdev,
 			   struct net_device *netdev, const u8 *buf,
-			   size_t len, gfp_t gfp, int uapsd_queues)
+			   size_t len, gfp_t gfp, int uapsd_queues,
+			   const u8 *req_ies, size_t req_ies_len)
 {
 	nl80211_send_mlme_event(rdev, netdev, buf, len,
-				NL80211_CMD_ASSOCIATE, gfp, uapsd_queues);
+				NL80211_CMD_ASSOCIATE, gfp, uapsd_queues,
+				req_ies, req_ies_len);
 }
 
 void nl80211_send_deauth(struct cfg80211_registered_device *rdev,
···
 			 size_t len, gfp_t gfp)
 {
 	nl80211_send_mlme_event(rdev, netdev, buf, len,
-				NL80211_CMD_DEAUTHENTICATE, gfp, -1);
+				NL80211_CMD_DEAUTHENTICATE, gfp, -1, NULL, 0);
 }
 
 void nl80211_send_disassoc(struct cfg80211_registered_device *rdev,
···
 			   size_t len, gfp_t gfp)
 {
 	nl80211_send_mlme_event(rdev, netdev, buf, len,
-				NL80211_CMD_DISASSOCIATE, gfp, -1);
+				NL80211_CMD_DISASSOCIATE, gfp, -1, NULL, 0);
 }
 
 void cfg80211_rx_unprot_mlme_mgmt(struct net_device *dev, const u8 *buf,
···
 		cmd = NL80211_CMD_UNPROT_DISASSOCIATE;
 
 	trace_cfg80211_rx_unprot_mlme_mgmt(dev, buf, len);
-	nl80211_send_mlme_event(rdev, dev, buf, len, cmd, GFP_ATOMIC, -1);
+	nl80211_send_mlme_event(rdev, dev, buf, len, cmd, GFP_ATOMIC, -1,
+				NULL, 0);
 }
 EXPORT_SYMBOL(cfg80211_rx_unprot_mlme_mgmt);
 

net/wireless/nl80211.h

···
 void nl80211_send_rx_assoc(struct cfg80211_registered_device *rdev,
 			   struct net_device *netdev,
 			   const u8 *buf, size_t len, gfp_t gfp,
-			   int uapsd_queues);
+			   int uapsd_queues,
+			   const u8 *req_ies, size_t req_ies_len);
 void nl80211_send_deauth(struct cfg80211_registered_device *rdev,
 			 struct net_device *netdev,
 			 const u8 *buf, size_t len, gfp_t gfp);