cfg80211: Validate cipher suite against supported ciphers

Instead of using a hardcoded list of cipher suites in nl80211.c, use a
shared function in util.c to verify that the driver advertises support
for the specified cipher. This provides more accurate validation of the
values and allows vendor-specific cipher suites to be added in drivers.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 15 insertions, 18 deletions

diff --git a/net/wireless/core.h b/net/wireless/core.h
index 796a4bdf8b0d..cb87b8bbceb7 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -406,6 +406,7 @@ void cfg80211_sme_failed_assoc(struct wireless_dev *wdev);
 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev);
 
 /* internal helpers */
+bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
                                    struct key_params *params, int key_idx,
                                    bool pairwise, const u8 *mac_addr);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 1722998f4984..a3e26951fd8b 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4126,16 +4126,6 @@ static bool nl80211_valid_wpa_versions(u32 wpa_versions)
                                   NL80211_WPA_VERSION_2));
 }
 
-static bool nl80211_valid_cipher_suite(u32 cipher)
-{
-        return cipher == WLAN_CIPHER_SUITE_WEP40 ||
-                cipher == WLAN_CIPHER_SUITE_WEP104 ||
-                cipher == WLAN_CIPHER_SUITE_TKIP ||
-                cipher == WLAN_CIPHER_SUITE_CCMP ||
-                cipher == WLAN_CIPHER_SUITE_AES_CMAC;
-}
-
-
 static int nl80211_authenticate(struct sk_buff *skb, struct genl_info *info)
 {
         struct cfg80211_registered_device *rdev = info->user_ptr[0];
@@ -4268,7 +4258,8 @@ static int nl80211_crypto_settings(struct cfg80211_registered_device *rdev,
                 memcpy(settings->ciphers_pairwise, data, len);
 
                 for (i = 0; i < settings->n_ciphers_pairwise; i++)
-                        if (!nl80211_valid_cipher_suite(
+                        if (!cfg80211_supported_cipher_suite(
+                                        &rdev->wiphy,
                                         settings->ciphers_pairwise[i]))
                                 return -EINVAL;
         }
@@ -4276,7 +4267,8 @@ static int nl80211_crypto_settings(struct cfg80211_registered_device *rdev,
         if (info->attrs[NL80211_ATTR_CIPHER_SUITE_GROUP]) {
                 settings->cipher_group =
                         nla_get_u32(info->attrs[NL80211_ATTR_CIPHER_SUITE_GROUP]);
-                if (!nl80211_valid_cipher_suite(settings->cipher_group))
+                if (!cfg80211_supported_cipher_suite(&rdev->wiphy,
+                                                     settings->cipher_group))
                         return -EINVAL;
         }
 
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 39dbf4ad7ca1..6304ed63588a 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -151,12 +151,19 @@ void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
                         set_mandatory_flags_band(wiphy->bands[band], band);
 }
 
+bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
+{
+        int i;
+        for (i = 0; i < wiphy->n_cipher_suites; i++)
+                if (cipher == wiphy->cipher_suites[i])
+                        return true;
+        return false;
+}
+
 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
                                    struct key_params *params, int key_idx,
                                    bool pairwise, const u8 *mac_addr)
 {
-        int i;
-
         if (key_idx > 5)
                 return -EINVAL;
 
@@ -226,10 +233,7 @@ int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
                 }
         }
 
-        for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
-                if (params->cipher == rdev->wiphy.cipher_suites[i])
-                        break;
-        if (i == rdev->wiphy.n_cipher_suites)
+        if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
                 return -EINVAL;
 
         return 0;