From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 20 May 2015 14:51:28 +0000 (+0200)
Subject: iwlwifi: mvm: advertise only HW-supported ciphers
X-Git-Tag: v4.2-rc1~130^2~139^2^2
X-Git-Url: http://git.cascardo.info/?a=commitdiff_plain;h=5f4c02e2b8c9251c827abf87c4ead4496c67492a;hp=42bbd6ecca5065debf99260923689ae52df7230d;p=cascardo%2Flinux.git

iwlwifi: mvm: advertise only HW-supported ciphers

After the new ciphers CCMP-256 and GCMP-128/256 were implemented,
wpa_supplicant could start negotiating them and use the software
implementation. This, however, breaks D3 behaviour in the driver
since it means that WoWLAN will not be possible.

To avoid breaking that feature, advertise only ciphers that the
hardware supports.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
---

diff --git a/drivers/net/wireless/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
index c46c69f2440f..08367fbc3bc4 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
@@ -415,6 +415,12 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
 {
 	struct ieee80211_hw *hw = mvm->hw;
 	int num_mac, ret, i;
+	static const u32 mvm_ciphers[] = {
+		WLAN_CIPHER_SUITE_WEP40,
+		WLAN_CIPHER_SUITE_WEP104,
+		WLAN_CIPHER_SUITE_TKIP,
+		WLAN_CIPHER_SUITE_CCMP,
+	};
 
 	/* Tell mac80211 our characteristics */
 	hw->flags = IEEE80211_HW_SIGNAL_DBM |
@@ -441,14 +447,32 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
 	hw->uapsd_queues = IWL_MVM_UAPSD_QUEUES;
 	hw->uapsd_max_sp_len = IWL_UAPSD_MAX_SP;
 
+	BUILD_BUG_ON(ARRAY_SIZE(mvm->ciphers) < ARRAY_SIZE(mvm_ciphers) + 2);
+	memcpy(mvm->ciphers, mvm_ciphers, sizeof(mvm_ciphers));
+	hw->wiphy->n_cipher_suites = ARRAY_SIZE(mvm_ciphers);
+	hw->wiphy->cipher_suites = mvm->ciphers;
+
 	/*
 	 * Enable 11w if advertised by firmware and software crypto
 	 * is not enabled (as the firmware will interpret some mgmt
 	 * packets, so enabling it with software crypto isn't safe)
 	 */
 	if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_MFP &&
-	    !iwlwifi_mod_params.sw_crypto)
+	    !iwlwifi_mod_params.sw_crypto) {
 		hw->flags |= IEEE80211_HW_MFP_CAPABLE;
+		mvm->ciphers[hw->wiphy->n_cipher_suites] =
+			WLAN_CIPHER_SUITE_AES_CMAC;
+		hw->wiphy->n_cipher_suites++;
+	}
+
+	/* currently FW API supports only one optional cipher scheme */
+	if (mvm->fw->cs[0].cipher) {
+		mvm->hw->n_cipher_schemes = 1;
+		mvm->hw->cipher_schemes = &mvm->fw->cs[0];
+		mvm->ciphers[hw->wiphy->n_cipher_suites] =
+			mvm->fw->cs[0].cipher;
+		hw->wiphy->n_cipher_suites++;
+	}
 
 	hw->flags |= IEEE80211_SINGLE_HW_SCAN_ON_ALL_BANDS;
 	hw->wiphy->features |=
@@ -574,12 +598,6 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
 
 	mvm->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 
-	/* currently FW API supports only one optional cipher scheme */
-	if (mvm->fw->cs[0].cipher) {
-		mvm->hw->n_cipher_schemes = 1;
-		mvm->hw->cipher_schemes = &mvm->fw->cs[0];
-	}
-
 #ifdef CONFIG_PM_SLEEP
 	if (iwl_mvm_is_d0i3_supported(mvm) &&
 	    device_can_wakeup(mvm->trans->dev)) {
diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h
index 255cde41d8b0..2d4bad5fe825 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h
@@ -820,6 +820,8 @@ struct iwl_mvm {
 	} tdls_cs;
 
 	struct iwl_mvm_shared_mem_cfg shared_mem_cfg;
+
+	u32 ciphers[6];
 };
 
 /* Extract MVM priv from op_mode and _hw */