From: Johannes Berg <johannes.berg@xxxxxxxxx>
Since we can process multiple packets at the
same time for different ACs, but the PN is
allocated from a single counter, we need to
use an atomic value there. Use atomic64_t to
make this cheaper on 64-bit platforms, other
platforms will support this through software
emulation, see lib/atomic64.c.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
net/mac80211/cfg.c | 14 ++++++++------
net/mac80211/debugfs_key.c | 6 ++++--
net/mac80211/key.h | 2 +-
net/mac80211/wpa.c | 19 ++++++++++---------
4 files changed, 23 insertions(+), 18 deletions(-)
--- a/net/mac80211/key.h 2011-07-06 12:08:57.000000000 +0200
+++ b/net/mac80211/key.h 2011-07-06 12:09:07.000000000 +0200
@@ -82,7 +82,7 @@ struct ieee80211_key {
struct tkip_ctx rx[NUM_RX_DATA_QUEUES];
} tkip;
struct {
- u8 tx_pn[6];
+ atomic64_t tx_pn;
/*
* Last received packet number. The first
* NUM_RX_DATA_QUEUES counters are used with Data
--- a/net/mac80211/cfg.c 2011-07-06 12:08:39.000000000 +0200
+++ b/net/mac80211/cfg.c 2011-07-06 12:09:07.000000000 +0200
@@ -209,6 +209,7 @@ static int ieee80211_get_key(struct wiph
u8 seq[6] = {0};
struct key_params params;
struct ieee80211_key *key = NULL;
+ u64 pn64;
u32 iv32;
u16 iv16;
int err = -ENOENT;
@@ -256,12 +257,13 @@ static int ieee80211_get_key(struct wiph
params.seq_len = 6;
break;
case WLAN_CIPHER_SUITE_CCMP:
- seq[0] = key->u.ccmp.tx_pn[5];
- seq[1] = key->u.ccmp.tx_pn[4];
- seq[2] = key->u.ccmp.tx_pn[3];
- seq[3] = key->u.ccmp.tx_pn[2];
- seq[4] = key->u.ccmp.tx_pn[1];
- seq[5] = key->u.ccmp.tx_pn[0];
+ pn64 = atomic64_read(&key->u.ccmp.tx_pn);
+ seq[0] = pn64;
+ seq[1] = pn64 >> 8;
+ seq[2] = pn64 >> 16;
+ seq[3] = pn64 >> 24;
+ seq[4] = pn64 >> 32;
+ seq[5] = pn64 >> 40;
params.seq = seq;
params.seq_len = 6;
break;
--- a/net/mac80211/wpa.c 2011-07-06 12:08:57.000000000 +0200
+++ b/net/mac80211/wpa.c 2011-07-06 12:09:07.000000000 +0200
@@ -380,8 +380,9 @@ static int ccmp_encrypt_skb(struct ieee8
struct ieee80211_key *key = tx->key;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
int hdrlen, len, tail;
- u8 *pos, *pn;
- int i;
+ u8 *pos;
+ u8 pn[6];
+ u64 pn64;
if (info->control.hw_key &&
!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
@@ -409,14 +410,14 @@ static int ccmp_encrypt_skb(struct ieee8
hdr = (struct ieee80211_hdr *) pos;
pos += hdrlen;
- /* PN = PN + 1 */
- pn = key->u.ccmp.tx_pn;
+ pn64 = atomic64_inc_return(&key->u.ccmp.tx_pn);
- for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
- pn[i]++;
- if (pn[i])
- break;
- }
+ pn[5] = pn64;
+ pn[4] = pn64 >> 8;
+ pn[3] = pn64 >> 16;
+ pn[2] = pn64 >> 24;
+ pn[1] = pn64 >> 32;
+ pn[0] = pn64 >> 40;
ccmp_pn2hdr(pos, pn, key->conf.keyidx);
--- a/net/mac80211/debugfs_key.c 2011-07-06 12:03:22.000000000 +0200
+++ b/net/mac80211/debugfs_key.c 2011-07-06 12:09:07.000000000 +0200
@@ -79,6 +79,7 @@ static ssize_t key_tx_spec_read(struct f
size_t count, loff_t *ppos)
{
const u8 *tpn;
+ u64 pn;
char buf[20];
int len;
struct ieee80211_key *key = file->private_data;
@@ -94,9 +95,10 @@ static ssize_t key_tx_spec_read(struct f
key->u.tkip.tx.iv16);
break;
case WLAN_CIPHER_SUITE_CCMP:
- tpn = key->u.ccmp.tx_pn;
+ pn = atomic64_read(&key->u.ccmp.tx_pn);
len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
- tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
+ (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
+ (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
tpn = key->u.aes_cmac.tx_pn;
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
