linux-kernel - [PATCH 13/16] wl1251: enforce changed hw encryption support on monitor state change

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Date:	Sat, 26 Oct 2013 22:34:12 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Luciano Coelho <luca@...lho.fi>,
	"John W. Linville" <linville@...driver.com>,
	Johannes Berg <johannes@...solutions.net>,
	"David S. Miller" <davem@...emloft.net>
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, freemangordon@....bg,
	aaro.koskinen@....fi, pavel@....cz, sre@...g0.de,
	joni.lapilainen@...il.com, pali.rohar@...il.com,
	David Gnedt <david.gnedt@...izone.at>
Subject: [PATCH 13/16] wl1251: enforce changed hw encryption support on monitor state change

From: David Gnedt <david.gnedt@...izone.at>

The firmware doesn't support per packet encryption selection, so disable hw
encryption support completly while a monitor interface is present to support
injection of packets (which shouldn't get encrypted by hw).
To enforce the changed hw encryption support force a disassociation on
non-monitor interfaces.
For disassociation a workaround using hw connection monitor is employed,
which temporary enables hw connection manager flag.

Signed-off-by: David Gnedt <david.gnedt@...izone.at>
---
 drivers/net/wireless/ti/wl1251/main.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/wireless/ti/wl1251/main.c b/drivers/net/wireless/ti/wl1251/main.c
index 174f403..f054741 100644
--- a/drivers/net/wireless/ti/wl1251/main.c
+++ b/drivers/net/wireless/ti/wl1251/main.c
@@ -685,6 +685,16 @@ static int wl1251_op_config(struct ieee80211_hw *hw, u32 changed)
 		wl->power_level = conf->power_level;
 	}
 
+	/*
+	 * Tell stack that connection is lost because hw encryption isn't
+	 * supported in monitor mode.
+	 * XXX This requires temporary enabling the hw connection monitor flag
+	 */
+	if ((changed & IEEE80211_CONF_CHANGE_MONITOR) && wl->vif) {
+		wl->hw->flags |= IEEE80211_HW_CONNECTION_MONITOR;
+		ieee80211_connection_loss(wl->vif);
+	}
+
 out_sleep:
 	wl1251_ps_elp_sleep(wl);
 
@@ -1116,6 +1126,9 @@ static void wl1251_op_bss_info_changed(struct ieee80211_hw *hw,
 	}
 
 	if (changed & BSS_CHANGED_ASSOC) {
+		/* XXX Disable temporary enabled hw connection monitor flag */
+		wl->hw->flags &= ~IEEE80211_HW_CONNECTION_MONITOR;
+
 		if (bss_conf->assoc) {
 			wl->beacon_int = bss_conf->beacon_int;
 
-- 
1.7.10.4

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