cfg80211: add cipher capabilities

This adds the necessary code and fields to let drivers specify
their cipher capabilities and exports them to userspace. Also
update mac80211 to export the ciphers it has.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 27 insertions, 1 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 679b3a14f11f..c1145be72da4 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -823,6 +823,15 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
         struct ieee80211_master_priv *mpriv;
         int channels, i, j, max_bitrates;
         bool supp_ht;
+        static const u32 cipher_suites[] = {
+                WLAN_CIPHER_SUITE_WEP40,
+                WLAN_CIPHER_SUITE_WEP104,
+                WLAN_CIPHER_SUITE_TKIP,
+                WLAN_CIPHER_SUITE_CCMP,
+
+                /* keep last -- depends on hw flags! */
+                WLAN_CIPHER_SUITE_AES_CMAC
+        };
 
         /*
          * generic code guarantees at least one band,
@@ -894,6 +903,11 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
         if (local->hw.wiphy->max_scan_ie_len)
                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 
+        local->hw.wiphy->cipher_suites = cipher_suites;
+        local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
+        if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
+                local->hw.wiphy->n_cipher_suites--;
+
         result = wiphy_register(local->hw.wiphy);
         if (result < 0)
                 goto fail_wiphy_register;
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 85b5aa3c76f8..d33cab0e0fb2 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -208,6 +208,10 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
         NLA_PUT_U16(msg, NL80211_ATTR_MAX_SCAN_IE_LEN,
                     dev->wiphy.max_scan_ie_len);
 
+        NLA_PUT(msg, NL80211_ATTR_CIPHER_SUITES,
+                sizeof(u32) * dev->wiphy.n_cipher_suites,
+                dev->wiphy.cipher_suites);
+
         nl_modes = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_IFTYPES);
         if (!nl_modes)
                 goto nla_put_failure;
@@ -979,7 +983,7 @@ static int nl80211_set_key(struct sk_buff *skb, struct genl_info *info)
 static int nl80211_new_key(struct sk_buff *skb, struct genl_info *info)
 {
         struct cfg80211_registered_device *drv;
-        int err;
+        int err, i;
         struct net_device *dev;
         struct key_params params;
         u8 key_idx = 0;
@@ -1048,6 +1052,14 @@ static int nl80211_new_key(struct sk_buff *skb, struct genl_info *info)
         if (err)
                 goto unlock_rtnl;
 
+        for (i = 0; i < drv->wiphy.n_cipher_suites; i++)
+                if (params.cipher == drv->wiphy.cipher_suites[i])
+                        break;
+        if (i == drv->wiphy.n_cipher_suites) {
+                err = -EINVAL;
+                goto out;
+        }
+
         if (!drv->ops->add_key) {
                 err = -EOPNOTSUPP;
                 goto out;