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mac80211: allow vendor specific cipher suites 

Allow drivers to specify their own set of cipher
suites to advertise vendor-specific ciphers. The
driver is then required to implement hardware
crypto offload for it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2010-08-27 14:26:52 +03:00 committed by John W. Linville
parent 7d64b7cc1f
commit 3ffc2a905b
7 changed files with 92 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/mac80211/cfg.c
View File

@ -119,9 +119,10 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
}
}
ieee80211_key_link(key, sdata, sta);
err = ieee80211_key_link(key, sdata, sta);
if (err)
ieee80211_key_free(sdata->local, key);
err = 0;
out_unlock:
mutex_unlock(&sdata->local->sta_mtx);

2
net/mac80211/ieee80211_i.h
View File

@ -662,6 +662,8 @@ struct ieee80211_local {
int fif_fcsfail, fif_plcpfail, fif_control, fif_other_bss, fif_pspoll;
unsigned int filter_flags; /* FIF_* */
bool wiphy_ciphers_allocated;
/* protects the aggregated multicast list and filter calls */
spinlock_t filter_lock;

38
net/mac80211/key.c
View File

@ -60,7 +60,7 @@ static struct ieee80211_sta *get_sta_for_key(struct ieee80211_key *key)
return NULL;
}
static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_sta *sta;
@ -68,8 +68,10 @@ static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
might_sleep();
if (!key->local->ops->set_key)
return;
if (!key->local->ops->set_key) {
ret = -EOPNOTSUPP;
goto out_unsupported;
}
assert_key_lock(key->local);
@ -90,6 +92,24 @@ static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
wiphy_err(key->local->hw.wiphy,
"failed to set key (%d, %pM) to hardware (%d)\n",
key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
out_unsupported:
if (ret) {
switch (key->conf.cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
case WLAN_CIPHER_SUITE_TKIP:
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_AES_CMAC:
/* all of these we can do in software */
ret = 0;
break;
default:
ret = -EINVAL;
}
}
return ret;
}
static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
@ -329,12 +349,12 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
kfree(key);
}
void ieee80211_key_link(struct ieee80211_key *key,
struct ieee80211_sub_if_data *sdata,
struct sta_info *sta)
int ieee80211_key_link(struct ieee80211_key *key,
struct ieee80211_sub_if_data *sdata,
struct sta_info *sta)
{
struct ieee80211_key *old_key;
int idx;
int idx, ret;
BUG_ON(!sdata);
BUG_ON(!key);
@ -389,9 +409,11 @@ void ieee80211_key_link(struct ieee80211_key *key,
ieee80211_debugfs_key_add(key);
ieee80211_key_enable_hw_accel(key);
ret = ieee80211_key_enable_hw_accel(key);
mutex_unlock(&sdata->local->key_mtx);
return ret;
}
static void __ieee80211_key_free(struct ieee80211_key *key)

6
net/mac80211/key.h
View File

@ -130,9 +130,9 @@ struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
* Insert a key into data structures (sdata, sta if necessary)
* to make it used, free old key.
*/
void ieee80211_key_link(struct ieee80211_key *key,
struct ieee80211_sub_if_data *sdata,
struct sta_info *sta);
int __must_check ieee80211_key_link(struct ieee80211_key *key,
struct ieee80211_sub_if_data *sdata,
struct sta_info *sta);
void ieee80211_key_free(struct ieee80211_local *local,
struct ieee80211_key *key);
void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx);

44
net/mac80211/main.c
View File

@ -662,13 +662,40 @@ 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--;
/* Set up cipher suites unless driver already did */
if (!local->hw.wiphy->cipher_suites) {
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--;
}
if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
local->hw.wiphy->cipher_suites += 2;
local->hw.wiphy->n_cipher_suites -= 2;
if (local->hw.wiphy->cipher_suites == cipher_suites) {
local->hw.wiphy->cipher_suites += 2;
local->hw.wiphy->n_cipher_suites -= 2;
} else {
u32 *suites;
int r, w = 0;
/* Filter out WEP */
suites = kmemdup(
local->hw.wiphy->cipher_suites,
sizeof(u32) * local->hw.wiphy->n_cipher_suites,
GFP_KERNEL);
if (!suites)
return -ENOMEM;
for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
u32 suite = local->hw.wiphy->cipher_suites[r];
if (suite == WLAN_CIPHER_SUITE_WEP40 ||
suite == WLAN_CIPHER_SUITE_WEP104)
continue;
suites[w++] = suite;
}
local->hw.wiphy->cipher_suites = suites;
local->hw.wiphy->n_cipher_suites = w;
local->wiphy_ciphers_allocated = true;
}
}
result = wiphy_register(local->hw.wiphy);
@ -783,6 +810,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
fail_workqueue:
wiphy_unregister(local->hw.wiphy);
fail_wiphy_register:
if (local->wiphy_ciphers_allocated)
kfree(local->hw.wiphy->cipher_suites);
kfree(local->int_scan_req);
return result;
}
@ -840,6 +869,9 @@ void ieee80211_free_hw(struct ieee80211_hw *hw)
mutex_destroy(&local->iflist_mtx);
mutex_destroy(&local->mtx);
if (local->wiphy_ciphers_allocated)
kfree(local->hw.wiphy->cipher_suites);
wiphy_free(local->hw.wiphy);
}
EXPORT_SYMBOL(ieee80211_free_hw);

6
net/mac80211/rx.c
View File

@ -1000,6 +1000,12 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
case WLAN_CIPHER_SUITE_AES_CMAC:
result = ieee80211_crypto_aes_cmac_decrypt(rx);
break;
default:
/*
* We can reach here only with HW-only algorithms
* but why didn't it decrypt the frame?!
*/
return RX_DROP_UNUSABLE;
}
/* either the frame has been decrypted or will be dropped */

12
net/mac80211/tx.c
View File

@ -947,6 +947,8 @@ ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
if (!tx->key)
return TX_CONTINUE;
@ -960,10 +962,16 @@ ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
return ieee80211_crypto_ccmp_encrypt(tx);
case WLAN_CIPHER_SUITE_AES_CMAC:
return ieee80211_crypto_aes_cmac_encrypt(tx);
default:
/* handle hw-only algorithm */
if (info->control.hw_key) {
ieee80211_tx_set_protected(tx);
return TX_CONTINUE;
}
break;
}
/* not reached */
WARN_ON(1);
return TX_DROP;
}