Add support for IEEE 802.11-2016 "Extended Key ID for Individually
Addressed Frames".
Extend cfg80211 and nl80211 to allow pairwise keys to be installed for
Rx only, enable Tx separately and allow Key ID 1 for pairwise keys.
Signed-off-by: Alexander Wetzel <alexander@xxxxxxxxxxxxxx>
---
include/net/cfg80211.h | 2 ++
include/uapi/linux/nl80211.h | 28 ++++++++++++++++++++++++++++
net/wireless/nl80211.c | 32 ++++++++++++++++++++++++++++----
net/wireless/rdev-ops.h | 3 ++-
net/wireless/trace.h | 31 ++++++++++++++++++++++++++-----
net/wireless/util.c | 21 +++++++++++++++------
6 files changed, 101 insertions(+), 16 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index bb307a11ee63..d89053de2fbb 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -485,6 +485,7 @@ struct vif_params {
* with the get_key() callback, must be in little endian,
* length given by @seq_len.
* @seq_len: length of @seq.
+ * @mode: key install mode (RX_TX, NO_TX or SET_TX)
*/
struct key_params {
const u8 *key;
@@ -492,6 +493,7 @@ struct key_params {
int key_len;
int seq_len;
u32 cipher;
+ enum nl80211_key_mode mode;
};
/**
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index dd4f86ee286e..098534d8a573 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -4134,6 +4134,27 @@ enum nl80211_channel_type {
NL80211_CHAN_HT40PLUS
};
+/**
+ * enum nl80211_key_mode - Key mode
+ *
+ * @NL80211_KEY_RX_TX: (Default)
+ * Key can be used for Rx and Tx immediately
+ *
+ * The following modes can only be selected for unicast keys and when the
+ * driver supports @NL80211_EXT_FEATURE_EXT_KEY_ID:
+ *
+ * @NL80211_KEY_NO_TX: Only allowed in combination with @NL80211_CMD_NEW_KEY:
+ * Unicast key can only be used for Rx, Tx not allowed, yet
+ * @NL80211_KEY_SET_TX: Only allowed in combination with @NL80211_CMD_SET_KEY:
+ * The unicast key identified by idx and mac is cleared for Tx and becomes
+ * the preferred Tx key for the station.
+ */
+enum nl80211_key_mode {
+ NL80211_KEY_RX_TX,
+ NL80211_KEY_NO_TX,
+ NL80211_KEY_SET_TX
+};
+
/**
* enum nl80211_chan_width - channel width definitions
*
@@ -4377,6 +4398,9 @@ enum nl80211_key_default_types {
* @NL80211_KEY_DEFAULT_TYPES: A nested attribute containing flags
* attributes, specifying what a key should be set as default as.
* See &enum nl80211_key_default_types.
+ * @NL80211_KEY_MODE: the mode from enum nl80211_key_mode.
+ * Defaults to @NL80211_KEY_RX_TX.
+ *
* @__NL80211_KEY_AFTER_LAST: internal
* @NL80211_KEY_MAX: highest key attribute
*/
@@ -4390,6 +4414,7 @@ enum nl80211_key_attributes {
NL80211_KEY_DEFAULT_MGMT,
NL80211_KEY_TYPE,
NL80211_KEY_DEFAULT_TYPES,
+ NL80211_KEY_MODE,
/* keep last */
__NL80211_KEY_AFTER_LAST,
@@ -5335,6 +5360,8 @@ enum nl80211_feature_flags {
* able to rekey an in-use key correctly. Userspace must not rekey PTK keys
* if this flag is not set. Ignoring this can leak clear text packets and/or
* freeze the connection.
+ * @NL80211_EXT_FEATURE_EXT_KEY_ID: Driver supports "Extended Key ID for
+ * Individually Addressed Frames" from IEEE802.11-2016.
*
* @NL80211_EXT_FEATURE_AIRTIME_FAIRNESS: Driver supports getting airtime
* fairness for transmitted packets and has enabled airtime fairness
@@ -5384,6 +5411,7 @@ enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER,
NL80211_EXT_FEATURE_AIRTIME_FAIRNESS,
NL80211_EXT_FEATURE_AP_PMKSA_CACHING,
+ NL80211_EXT_FEATURE_EXT_KEY_ID,
/* add new features before the definition below */
NUM_NL80211_EXT_FEATURES,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 25a9e3b5c154..4167dcdf516e 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -553,6 +553,7 @@ static const struct nla_policy nl80211_key_policy[NL80211_KEY_MAX + 1] = {
[NL80211_KEY_DEFAULT_MGMT] = { .type = NLA_FLAG },
[NL80211_KEY_TYPE] = NLA_POLICY_MAX(NLA_U32, NUM_NL80211_KEYTYPES - 1),
[NL80211_KEY_DEFAULT_TYPES] = { .type = NLA_NESTED },
+ [NL80211_KEY_MODE] = { .type = NLA_U8 },
};
/* policy for the key default flags */
@@ -958,6 +959,9 @@ static int nl80211_parse_key_new(struct genl_info *info, struct nlattr *key,
k->def_multi = kdt[NL80211_KEY_DEFAULT_TYPE_MULTICAST];
}
+ if (tb[NL80211_KEY_MODE])
+ k->p.mode = nla_get_u8(tb[NL80211_KEY_MODE]);
+
return 0;
}
@@ -3634,8 +3638,11 @@ static int nl80211_set_key(struct sk_buff *skb, struct genl_info *info)
if (key.idx < 0)
return -EINVAL;
- /* only support setting default key */
- if (!key.def && !key.defmgmt)
+ /* Only support setting default key and
+ * Extended Key ID action NL80211_KEY_SET_TX.
+ */
+ if (!key.def && !key.defmgmt &&
+ !(key.p.mode == NL80211_KEY_SET_TX))
return -EINVAL;
wdev_lock(dev->ieee80211_ptr);
@@ -3659,7 +3666,7 @@ static int nl80211_set_key(struct sk_buff *skb, struct genl_info *info)
#ifdef CONFIG_CFG80211_WEXT
dev->ieee80211_ptr->wext.default_key = key.idx;
#endif
- } else {
+ } else if (key.defmgmt) {
if (key.def_uni || !key.def_multi) {
err = -EINVAL;
goto out;
@@ -3681,8 +3688,25 @@ static int nl80211_set_key(struct sk_buff *skb, struct genl_info *info)
#ifdef CONFIG_CFG80211_WEXT
dev->ieee80211_ptr->wext.default_mgmt_key = key.idx;
#endif
- }
+ } else if (key.p.mode == NL80211_KEY_SET_TX &&
+ wiphy_ext_feature_isset(&rdev->wiphy,
+ NL80211_EXT_FEATURE_EXT_KEY_ID)) {
+ u8 *mac_addr = NULL;
+ if (info->attrs[NL80211_ATTR_MAC])
+ mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
+
+ if (!mac_addr || key.idx < 0 || key.idx > 1) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = rdev_add_key(rdev, dev, key.idx,
+ NL80211_KEYTYPE_PAIRWISE,
+ mac_addr, &key.p);
+ } else {
+ err = -EINVAL;
+ }
out:
wdev_unlock(dev->ieee80211_ptr);
diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h
index 5cb48d135fab..5044e634a455 100644
--- a/net/wireless/rdev-ops.h
+++ b/net/wireless/rdev-ops.h
@@ -77,7 +77,8 @@ static inline int rdev_add_key(struct cfg80211_registered_device *rdev,
struct key_params *params)
{
int ret;
- trace_rdev_add_key(&rdev->wiphy, netdev, key_index, pairwise, mac_addr);
+ trace_rdev_add_key(&rdev->wiphy, netdev, key_index, pairwise,
+ mac_addr, params->mode);
ret = rdev->ops->add_key(&rdev->wiphy, netdev, key_index, pairwise,
mac_addr, params);
trace_rdev_return_int(&rdev->wiphy, ret);
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 44b2ce1bb13a..0876f3eb3b3b 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -430,22 +430,43 @@ DECLARE_EVENT_CLASS(key_handle,
BOOL_TO_STR(__entry->pairwise), MAC_PR_ARG(mac_addr))
);
-DEFINE_EVENT(key_handle, rdev_add_key,
+DEFINE_EVENT(key_handle, rdev_get_key,
TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, u8 key_index,
bool pairwise, const u8 *mac_addr),
TP_ARGS(wiphy, netdev, key_index, pairwise, mac_addr)
);
-DEFINE_EVENT(key_handle, rdev_get_key,
+DEFINE_EVENT(key_handle, rdev_del_key,
TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, u8 key_index,
bool pairwise, const u8 *mac_addr),
TP_ARGS(wiphy, netdev, key_index, pairwise, mac_addr)
);
-DEFINE_EVENT(key_handle, rdev_del_key,
+TRACE_EVENT(rdev_add_key,
TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, u8 key_index,
- bool pairwise, const u8 *mac_addr),
- TP_ARGS(wiphy, netdev, key_index, pairwise, mac_addr)
+ bool pairwise, const u8 *mac_addr, u8 mode),
+ TP_ARGS(wiphy, netdev, key_index, pairwise, mac_addr, mode),
+ TP_STRUCT__entry(
+ WIPHY_ENTRY
+ NETDEV_ENTRY
+ MAC_ENTRY(mac_addr)
+ __field(u8, key_index)
+ __field(bool, pairwise)
+ __field(u8, mode)
+ ),
+ TP_fast_assign(
+ WIPHY_ASSIGN;
+ NETDEV_ASSIGN;
+ MAC_ASSIGN(mac_addr, mac_addr);
+ __entry->key_index = key_index;
+ __entry->pairwise = pairwise;
+ __entry->mode = mode;
+ ),
+ TP_printk(WIPHY_PR_FMT ", " NETDEV_PR_FMT ", key_index: %u, "
+ "mode: %u, pairwise: %s, mac addr: " MAC_PR_FMT,
+ WIPHY_PR_ARG, NETDEV_PR_ARG, __entry->key_index,
+ __entry->mode, BOOL_TO_STR(__entry->pairwise),
+ MAC_PR_ARG(mac_addr))
);
TRACE_EVENT(rdev_set_default_key,
diff --git a/net/wireless/util.c b/net/wireless/util.c
index e4b8db5e81ec..6c02c9cf7aa9 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -237,14 +237,23 @@ int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
- /* Disallow pairwise keys with non-zero index unless it's WEP
- * or a vendor specific cipher (because current deployments use
- * pairwise WEP keys with non-zero indices and for vendor
- * specific ciphers this should be validated in the driver or
- * hardware level - but 802.11i clearly specifies to use zero)
+ /* IEEE802.11-2016 allows only 0 and - when using Extended Key
+ * ID - 1 as index for pairwise keys.
+ * @NL80211_KEY_NO_TX is only allowed for pairwise keys when
+ * the driver supports Extended Key ID.
+ * @NL80211_KEY_SET_TX can't be set when installing and
+ * validating a key.
*/
- if (pairwise && key_idx)
+ if (params->mode == NL80211_KEY_NO_TX) {
+ if (!wiphy_ext_feature_isset(&rdev->wiphy,
+ NL80211_EXT_FEATURE_EXT_KEY_ID))
+ return -EINVAL;
+ else if (!pairwise || key_idx < 0 || key_idx > 1)
+ return -EINVAL;
+ } else if ((pairwise && key_idx) ||
+ params->mode == NL80211_KEY_SET_TX) {
return -EINVAL;
+ }
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
--
2.21.0
