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nl80211/cfg80211: Extended Key ID support 

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@wetzel-home.de>
[use NLA_POLICY_RANGE() for NL80211_KEY_MODE]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Alexander Wetzel 2019-03-19 21:34:07 +01:00 committed by Johannes Berg
parent 092c4098f2
commit 6cdd3979a2
6 changed files with 102 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/cfg80211.h
View File

@ -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;
};
/**

28
include/uapi/linux/nl80211.h
View File

@ -4152,6 +4152,27 @@ 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
*
@ -4395,6 +4416,9 @@ 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
*/
@ -4408,6 +4432,7 @@ enum nl80211_key_attributes {
NL80211_KEY_DEFAULT_MGMT,
NL80211_KEY_TYPE,
NL80211_KEY_DEFAULT_TYPES,
NL80211_KEY_MODE,
/* keep last */
__NL80211_KEY_AFTER_LAST,
@ -5353,6 +5378,8 @@ 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
@ -5406,6 +5433,7 @@ enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_AIRTIME_FAIRNESS,
NL80211_EXT_FEATURE_AP_PMKSA_CACHING,
NL80211_EXT_FEATURE_SCHED_SCAN_BAND_SPECIFIC_RSSI_THOLD,
NL80211_EXT_FEATURE_EXT_KEY_ID,
/* add new features before the definition below */
NUM_NL80211_EXT_FEATURES,

32
net/wireless/nl80211.c
View File

@ -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] = NLA_POLICY_RANGE(NLA_U8, 0, NL80211_KEY_SET_TX),
};
/* policy for the key default flags */
@ -967,6 +968,9 @@ 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;
}
@ -3643,8 +3647,11 @@ 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);
@ -3668,7 +3675,7 @@ 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;
@ -3690,8 +3697,25 @@ 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);

3
net/wireless/rdev-ops.h
View File

@ -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);

33
net/wireless/trace.h
View File

@ -430,12 +430,6 @@ DECLARE_EVENT_CLASS(key_handle,
BOOL_TO_STR(__entry->pairwise), MAC_PR_ARG(mac_addr))
);
DEFINE_EVENT(key_handle, 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)
);
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),
@ -448,6 +442,33 @@ DEFINE_EVENT(key_handle, rdev_del_key,
TP_ARGS(wiphy, netdev, key_index, pairwise, mac_addr)
);
TRACE_EVENT(rdev_add_key,
TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, u8 key_index,
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,
TP_PROTO(struct wiphy *wiphy, struct net_device *netdev, u8 key_index,
bool unicast, bool multicast),

21
net/wireless/util.c
View File

@ -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: