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authorYogesh Ashok Powar <yogeshp@marvell.com>2011-06-28 18:41:37 +0530
committerJohn W. Linville <linville@tuxdriver.com>2011-07-05 15:26:50 -0400
commit3bff1865186c6bb97855f0c13e3850543dce9cef (patch)
tree4a9150f82cbb83a01f8fb82b3bf2d69028230928 /net/mac80211/key.c
parent252e735d64880b011f6cdeb41ebcac2eaeb58fd3 (diff)
downloadlinux-3bff1865186c6bb97855f0c13e3850543dce9cef.tar.bz2
mac80211: Skip tailroom reservation for full HW-crypto devices with race fix
Based on inputs from Johannes Berg <johannes@sipsolutions.net> from http://article.gmane.org/gmane.linux.kernel.wireless.general/68193 and http://article.gmane.org/gmane.linux.kernel.wireless.general/71702 In xmit path, devices that do full hardware crypto (including MMIC and ICV) need no tailroom. For such devices, tailroom reservation can be skipped if all the keys are programmed into the hardware (i.e software crypto is not used for any of the keys) and none of the keys wants software to generate Michael MIC and IV. v2: Added check for IV along with MMIC. Reported-by: Fabio Rossi <rossi.f@inwind.it> Tested-by: Fabio Rossi <rossi.f@inwind.it> Signed-off-by: Mohammed Shafi Shajakhan <mshajakhan@atheros.com> Cc: Mohammed Shafi Shajakhan <mshajakhan@atheros.com> v3: Fixing races to avoid WARNING: at net/mac80211/wpa.c:397 ccmp_encrypt_skb+0xc4/0x1f0 Reported-by: Andreas Hartmann <andihartmann@01019freenet.de> Tested-by: Andreas Hartmann <andihartmann@01019freenet.de> v4: Added links with message ID Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/key.c')
-rw-r--r--net/mac80211/key.c51
1 files changed, 49 insertions, 2 deletions
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index f825e2f0a57e..0af958c74342 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -61,6 +61,36 @@ static struct ieee80211_sta *get_sta_for_key(struct ieee80211_key *key)
return NULL;
}
+static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
+{
+ /*
+ * When this count is zero, SKB resizing for allocating tailroom
+ * for IV or MMIC is skipped. But, this check has created two race
+ * cases in xmit path while transiting from zero count to one:
+ *
+ * 1. SKB resize was skipped because no key was added but just before
+ * the xmit key is added and SW encryption kicks off.
+ *
+ * 2. SKB resize was skipped because all the keys were hw planted but
+ * just before xmit one of the key is deleted and SW encryption kicks
+ * off.
+ *
+ * In both the above case SW encryption will find not enough space for
+ * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
+ *
+ * Solution has been explained at
+ * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
+ */
+
+ if (!sdata->crypto_tx_tailroom_needed_cnt++) {
+ /*
+ * Flush all XMIT packets currently using HW encryption or no
+ * encryption at all if the count transition is from 0 -> 1.
+ */
+ synchronize_net();
+ }
+}
+
static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
{
struct ieee80211_sub_if_data *sdata;
@@ -101,6 +131,11 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
if (!ret) {
key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
+
+ if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
+ (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
+ sdata->crypto_tx_tailroom_needed_cnt--;
+
return 0;
}
@@ -142,6 +177,10 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
sta = get_sta_for_key(key);
sdata = key->sdata;
+ if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
+ (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
+ increment_tailroom_need_count(sdata);
+
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
sdata = container_of(sdata->bss,
struct ieee80211_sub_if_data,
@@ -394,8 +433,10 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
ieee80211_aes_key_free(key->u.ccmp.tfm);
if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
- if (key->local)
+ if (key->local) {
ieee80211_debugfs_key_remove(key);
+ key->sdata->crypto_tx_tailroom_needed_cnt--;
+ }
kfree(key);
}
@@ -452,6 +493,8 @@ int ieee80211_key_link(struct ieee80211_key *key,
else
old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
+ increment_tailroom_need_count(sdata);
+
__ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
__ieee80211_key_destroy(old_key);
@@ -498,8 +541,12 @@ void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
mutex_lock(&sdata->local->key_mtx);
- list_for_each_entry(key, &sdata->key_list, list)
+ sdata->crypto_tx_tailroom_needed_cnt = 0;
+
+ list_for_each_entry(key, &sdata->key_list, list) {
+ increment_tailroom_need_count(sdata);
ieee80211_key_enable_hw_accel(key);
+ }
mutex_unlock(&sdata->local->key_mtx);
}