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authorJohannes Berg <johannes.berg@intel.com>2015-01-22 18:44:19 +0100
committerJohannes Berg <johannes.berg@intel.com>2015-01-22 22:01:01 +0100
commitfa7e1fbcb52cc9efab394526a566d80fb31529bb (patch)
tree3fe7b35805171a28a7f23389a2a40cee834e5381 /net/mac80211
parent54330bf63b49683d006d8f3857d45722a8c0fbff (diff)
downloadlinux-fa7e1fbcb52cc9efab394526a566d80fb31529bb.tar.bz2
mac80211: allow drivers to control software crypto
Some drivers unfortunately cannot support software crypto, but mac80211 currently assumes that they do. This has the issue that if the hardware enabling fails for some reason, the software fallback is used, which won't work. This clearly isn't desirable, the error should be reported and the key setting refused. Support this in mac80211 by allowing drivers to set a new HW flag IEEE80211_HW_SW_CRYPTO_CONTROL, in which case mac80211 will only allow software fallback if the set_key() method returns 1. The driver will also need to advertise supported cipher suites so that mac80211 doesn't advertise any (future) software ciphers that the driver can't actually do. While at it, to make it easier to support this, refactor the ieee80211_init_cipher_suites() code. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/key.c10
-rw-r--r--net/mac80211/main.c65
2 files changed, 46 insertions, 29 deletions
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index f8d9f0ee59bf..5167c53aa15f 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -90,7 +90,7 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
{
struct ieee80211_sub_if_data *sdata;
struct sta_info *sta;
- int ret;
+ int ret = -EOPNOTSUPP;
might_sleep();
@@ -150,7 +150,7 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
return 0;
}
- if (ret != -ENOSPC && ret != -EOPNOTSUPP)
+ if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
sdata_err(sdata,
"failed to set key (%d, %pM) to hardware (%d)\n",
key->conf.keyidx,
@@ -163,7 +163,11 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
case WLAN_CIPHER_SUITE_TKIP:
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_AES_CMAC:
- /* all of these we can do in software */
+ /* all of these we can do in software - if driver can */
+ if (ret == 1)
+ return 0;
+ if (key->local->hw.flags & IEEE80211_HW_SW_CRYPTO_CONTROL)
+ return -EINVAL;
return 0;
default:
return -EINVAL;
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 46264cb6604b..ea6b82ac4f0b 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -658,7 +658,6 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
IS_ERR(local->wep_rx_tfm));
bool have_mfp = local->hw.flags & IEEE80211_HW_MFP_CAPABLE;
- const struct ieee80211_cipher_scheme *cs = local->hw.cipher_schemes;
int n_suites = 0, r = 0, w = 0;
u32 *suites;
static const u32 cipher_suites[] = {
@@ -672,12 +671,38 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
WLAN_CIPHER_SUITE_AES_CMAC
};
- /* Driver specifies the ciphers, we have nothing to do... */
- if (local->hw.wiphy->cipher_suites && have_wep)
- return 0;
+ if (local->hw.flags & IEEE80211_HW_SW_CRYPTO_CONTROL ||
+ local->hw.wiphy->cipher_suites) {
+ /* If the driver advertises, or doesn't support SW crypto,
+ * we only need to remove WEP if necessary.
+ */
+ if (have_wep)
+ return 0;
+
+ /* well if it has _no_ ciphers ... fine */
+ if (!local->hw.wiphy->n_cipher_suites)
+ return 0;
+
+ /* Driver provides cipher suites, but we need to exclude WEP */
+ suites = kmemdup(local->hw.wiphy->cipher_suites,
+ sizeof(u32) * local->hw.wiphy->n_cipher_suites,
+ GFP_KERNEL);
+ if (!suites)
+ return -ENOMEM;
- /* Set up cipher suites if driver relies on mac80211 cipher defs */
- if (!local->hw.wiphy->cipher_suites && !cs) {
+ 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;
+ }
+ } else if (!local->hw.cipher_schemes) {
+ /* If the driver doesn't have cipher schemes, there's nothing
+ * else to do other than assign the (software supported and
+ * perhaps offloaded) cipher suites.
+ */
local->hw.wiphy->cipher_suites = cipher_suites;
local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
@@ -689,12 +714,16 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
local->hw.wiphy->n_cipher_suites -= 2;
}
+ /* not dynamically allocated, so just return */
return 0;
- }
+ } else {
+ const struct ieee80211_cipher_scheme *cs;
- if (!local->hw.wiphy->cipher_suites) {
- /*
- * Driver specifies cipher schemes only
+ cs = local->hw.cipher_schemes;
+
+ /* Driver specifies cipher schemes only (but not cipher suites
+ * including the schemes)
+ *
* We start counting ciphers defined by schemes, TKIP and CCMP
*/
n_suites = local->hw.n_cipher_schemes + 2;
@@ -724,22 +753,6 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
for (r = 0; r < local->hw.n_cipher_schemes; r++)
suites[w++] = cs[r].cipher;
- } else {
- /* Driver provides cipher suites, but we need to exclude 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;