cfg80211: support bigger kek/kck key length
With some newer AKMs, the KCK and KEK are bigger, so allow that if the driver advertises support for it. In addition, add a new attribute for the AKM so we can use it for offloaded rekeying. Signed-off-by: Nathan Errera <nathan.errera@intel.com> [reword commit message] Link: https://lore.kernel.org/r/20200528212237.5eb58b00a5d1.I61b09d77c4f382e8d58a05dcca78096e99a6bc15@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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Родитель
07c12d618f
Коммит
093a48d2aa
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@ -2936,12 +2936,17 @@ struct cfg80211_wowlan_wakeup {
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/**
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* struct cfg80211_gtk_rekey_data - rekey data
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* @kek: key encryption key (NL80211_KEK_LEN bytes)
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* @kck: key confirmation key (NL80211_KCK_LEN bytes)
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* @kek: key encryption key (@kek_len bytes)
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* @kck: key confirmation key (@kck_len bytes)
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* @replay_ctr: replay counter (NL80211_REPLAY_CTR_LEN bytes)
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* @kek_len: length of kek
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* @kck_len length of kck
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* @akm: akm (oui, id)
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*/
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struct cfg80211_gtk_rekey_data {
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const u8 *kek, *kck, *replay_ctr;
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u32 akm;
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u8 kek_len, kck_len;
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};
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/**
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@ -4166,9 +4171,10 @@ struct cfg80211_ops {
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* beaconing mode (AP, IBSS, Mesh, ...).
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* @WIPHY_FLAG_HAS_STATIC_WEP: The device supports static WEP key installation
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* before connection.
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* @WIPHY_FLAG_SUPPORTS_EXT_KEK_KCK: The device supports bigger kek and kck keys
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*/
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enum wiphy_flags {
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/* use hole at 0 */
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WIPHY_FLAG_SUPPORTS_EXT_KEK_KCK = BIT(0),
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/* use hole at 1 */
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/* use hole at 2 */
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WIPHY_FLAG_NETNS_OK = BIT(3),
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@ -5396,6 +5396,8 @@ enum plink_actions {
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#define NL80211_KCK_LEN 16
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#define NL80211_KEK_LEN 16
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#define NL80211_KCK_EXT_LEN 24
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#define NL80211_KEK_EXT_LEN 32
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#define NL80211_REPLAY_CTR_LEN 8
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/**
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@ -5404,6 +5406,7 @@ enum plink_actions {
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* @NL80211_REKEY_DATA_KEK: key encryption key (binary)
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* @NL80211_REKEY_DATA_KCK: key confirmation key (binary)
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* @NL80211_REKEY_DATA_REPLAY_CTR: replay counter (binary)
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* @NL80211_REKEY_DATA_AKM: AKM data (OUI, suite type)
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* @NUM_NL80211_REKEY_DATA: number of rekey attributes (internal)
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* @MAX_NL80211_REKEY_DATA: highest rekey attribute (internal)
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*/
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@ -5412,6 +5415,7 @@ enum nl80211_rekey_data {
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NL80211_REKEY_DATA_KEK,
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NL80211_REKEY_DATA_KCK,
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NL80211_REKEY_DATA_REPLAY_CTR,
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NL80211_REKEY_DATA_AKM,
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/* keep last */
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NUM_NL80211_REKEY_DATA,
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@ -730,9 +730,16 @@ nl80211_coalesce_policy[NUM_NL80211_ATTR_COALESCE_RULE] = {
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/* policy for GTK rekey offload attributes */
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static const struct nla_policy
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nl80211_rekey_policy[NUM_NL80211_REKEY_DATA] = {
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[NL80211_REKEY_DATA_KEK] = NLA_POLICY_EXACT_LEN_WARN(NL80211_KEK_LEN),
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[NL80211_REKEY_DATA_KCK] = NLA_POLICY_EXACT_LEN_WARN(NL80211_KCK_LEN),
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[NL80211_REKEY_DATA_KEK] = {
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.type = NLA_BINARY,
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.len = NL80211_KEK_EXT_LEN
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},
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[NL80211_REKEY_DATA_KCK] = {
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.type = NLA_BINARY,
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.len = NL80211_KCK_EXT_LEN
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},
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[NL80211_REKEY_DATA_REPLAY_CTR] = NLA_POLICY_EXACT_LEN_WARN(NL80211_REPLAY_CTR_LEN),
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[NL80211_REKEY_DATA_AKM] = { .type = NLA_U32 },
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};
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static const struct nla_policy
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@ -12347,14 +12354,22 @@ static int nl80211_set_rekey_data(struct sk_buff *skb, struct genl_info *info)
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return -EINVAL;
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if (nla_len(tb[NL80211_REKEY_DATA_REPLAY_CTR]) != NL80211_REPLAY_CTR_LEN)
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return -ERANGE;
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if (nla_len(tb[NL80211_REKEY_DATA_KEK]) != NL80211_KEK_LEN)
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if (nla_len(tb[NL80211_REKEY_DATA_KEK]) != NL80211_KEK_LEN &&
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!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_EXT_KEK_KCK &&
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nla_len(tb[NL80211_REKEY_DATA_KEK]) == NL80211_KEK_EXT_LEN))
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return -ERANGE;
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if (nla_len(tb[NL80211_REKEY_DATA_KCK]) != NL80211_KCK_LEN)
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if (nla_len(tb[NL80211_REKEY_DATA_KCK]) != NL80211_KCK_LEN &&
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!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_EXT_KEK_KCK &&
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nla_len(tb[NL80211_REKEY_DATA_KEK]) == NL80211_KCK_EXT_LEN))
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return -ERANGE;
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rekey_data.kek = nla_data(tb[NL80211_REKEY_DATA_KEK]);
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rekey_data.kck = nla_data(tb[NL80211_REKEY_DATA_KCK]);
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rekey_data.replay_ctr = nla_data(tb[NL80211_REKEY_DATA_REPLAY_CTR]);
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rekey_data.kek_len = nla_len(tb[NL80211_REKEY_DATA_KEK]);
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rekey_data.kck_len = nla_len(tb[NL80211_REKEY_DATA_KCK]);
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if (tb[NL80211_REKEY_DATA_AKM])
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rekey_data.akm = nla_get_u32(tb[NL80211_REKEY_DATA_AKM]);
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wdev_lock(wdev);
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if (!wdev->current_bss) {
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