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-rw-r--r--net/mac80211/key.c1
-rw-r--r--net/mac80211/key.h10
-rw-r--r--net/mac80211/tkip.c111
-rw-r--r--net/mac80211/tkip.h8
-rw-r--r--net/mac80211/wpa.c9
5 files changed, 78 insertions, 61 deletions
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 1208a7878bfd..d930d4d4876d 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -369,6 +369,7 @@ struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
get_unaligned_le16(seq);
}
}
+ spin_lock_init(&key->u.tkip.txlock);
break;
case WLAN_CIPHER_SUITE_CCMP:
key->conf.iv_len = CCMP_HDR_LEN;
diff --git a/net/mac80211/key.h b/net/mac80211/key.h
index d801d5351336..1493c3e56b9f 100644
--- a/net/mac80211/key.h
+++ b/net/mac80211/key.h
@@ -52,9 +52,10 @@ enum ieee80211_internal_tkip_state {
};
struct tkip_ctx {
- u32 iv32;
- u16 iv16;
- u16 p1k[5];
+ u32 iv32; /* current iv32 */
+ u16 iv16; /* current iv16 */
+ u16 p1k[5]; /* p1k cache */
+ u32 p1k_iv32; /* iv32 for which p1k computed */
enum ieee80211_internal_tkip_state state;
};
@@ -71,6 +72,9 @@ struct ieee80211_key {
union {
struct {
+ /* protects tx context */
+ spinlock_t txlock;
+
/* last used TSC */
struct tkip_ctx tx;
diff --git a/net/mac80211/tkip.c b/net/mac80211/tkip.c
index 757e4eb2baf7..de570b38460f 100644
--- a/net/mac80211/tkip.c
+++ b/net/mac80211/tkip.c
@@ -101,6 +101,7 @@ static void tkip_mixing_phase1(const u8 *tk, struct tkip_ctx *ctx,
p1k[4] += tkipS(p1k[3] ^ get_unaligned_le16(tk + 0 + j)) + i;
}
ctx->state = TKIP_STATE_PHASE1_DONE;
+ ctx->p1k_iv32 = tsc_IV32;
}
static void tkip_mixing_phase2(const u8 *tk, struct tkip_ctx *ctx,
@@ -140,60 +141,72 @@ static void tkip_mixing_phase2(const u8 *tk, struct tkip_ctx *ctx,
/* Add TKIP IV and Ext. IV at @pos. @iv0, @iv1, and @iv2 are the first octets
* of the IV. Returns pointer to the octet following IVs (i.e., beginning of
* the packet payload). */
-u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key, u16 iv16)
+u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key)
{
- pos = write_tkip_iv(pos, iv16);
+ lockdep_assert_held(&key->u.tkip.txlock);
+
+ pos = write_tkip_iv(pos, key->u.tkip.tx.iv16);
*pos++ = (key->conf.keyidx << 6) | (1 << 5) /* Ext IV */;
put_unaligned_le32(key->u.tkip.tx.iv32, pos);
return pos + 4;
}
-void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
- struct sk_buff *skb, enum ieee80211_tkip_key_type type,
- u8 *outkey)
+static void ieee80211_compute_tkip_p1k(struct ieee80211_key *key, u32 iv32)
+{
+ struct ieee80211_sub_if_data *sdata = key->sdata;
+ struct tkip_ctx *ctx = &key->u.tkip.tx;
+ const u8 *tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
+
+ lockdep_assert_held(&key->u.tkip.txlock);
+
+ /*
+ * Update the P1K when the IV32 is different from the value it
+ * had when we last computed it (or when not initialised yet).
+ * This might flip-flop back and forth if packets are processed
+ * out-of-order due to the different ACs, but then we have to
+ * just compute the P1K more often.
+ */
+ if (ctx->p1k_iv32 != iv32 || ctx->state == TKIP_STATE_NOT_INIT)
+ tkip_mixing_phase1(tk, ctx, sdata->vif.addr, iv32);
+}
+
+void ieee80211_get_tkip_p1k(struct ieee80211_key_conf *keyconf,
+ struct sk_buff *skb, u16 *p1k)
{
struct ieee80211_key *key = (struct ieee80211_key *)
container_of(keyconf, struct ieee80211_key, conf);
+ struct tkip_ctx *ctx = &key->u.tkip.tx;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
- u8 *data;
- const u8 *tk;
- struct tkip_ctx *ctx;
- u16 iv16;
- u32 iv32;
-
- data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
- iv16 = data[2] | (data[0] << 8);
- iv32 = get_unaligned_le32(&data[4]);
-
- tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
- ctx = &key->u.tkip.tx;
-
-#ifdef CONFIG_MAC80211_TKIP_DEBUG
- printk(KERN_DEBUG "TKIP encrypt: iv16 = 0x%04x, iv32 = 0x%08x\n",
- iv16, iv32);
-
- if (iv32 != ctx->iv32) {
- printk(KERN_DEBUG "skb: iv32 = 0x%08x key: iv32 = 0x%08x\n",
- iv32, ctx->iv32);
- printk(KERN_DEBUG "Wrap around of iv16 in the middle of a "
- "fragmented packet\n");
- }
-#endif
-
- /* Update the p1k only when the iv16 in the packet wraps around, this
- * might occur after the wrap around of iv16 in the key in case of
- * fragmented packets. */
- if (iv16 == 0 || ctx->state == TKIP_STATE_NOT_INIT)
- tkip_mixing_phase1(tk, ctx, hdr->addr2, iv32);
-
- if (type == IEEE80211_TKIP_P1_KEY) {
- memcpy(outkey, ctx->p1k, sizeof(u16) * 5);
- return;
- }
+ const u8 *data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
+ u32 iv32 = get_unaligned_le32(&data[4]);
+ unsigned long flags;
+
+ spin_lock_irqsave(&key->u.tkip.txlock, flags);
+ ieee80211_compute_tkip_p1k(key, iv32);
+ memcpy(p1k, ctx->p1k, sizeof(ctx->p1k));
+ spin_unlock_irqrestore(&key->u.tkip.txlock, flags);
+}
+EXPORT_SYMBOL(ieee80211_get_tkip_p1k);
- tkip_mixing_phase2(tk, ctx, iv16, outkey);
+void ieee80211_get_tkip_p2k(struct ieee80211_key_conf *keyconf,
+ struct sk_buff *skb, u8 *p2k)
+{
+ struct ieee80211_key *key = (struct ieee80211_key *)
+ container_of(keyconf, struct ieee80211_key, conf);
+ const u8 *tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
+ struct tkip_ctx *ctx = &key->u.tkip.tx;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ const u8 *data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
+ u32 iv32 = get_unaligned_le32(&data[4]);
+ u16 iv16 = data[2] | (data[0] << 8);
+ unsigned long flags;
+
+ spin_lock_irqsave(&key->u.tkip.txlock, flags);
+ ieee80211_compute_tkip_p1k(key, iv32);
+ tkip_mixing_phase2(tk, ctx, iv16, p2k);
+ spin_unlock_irqrestore(&key->u.tkip.txlock, flags);
}
-EXPORT_SYMBOL(ieee80211_get_tkip_key);
+EXPORT_SYMBOL(ieee80211_get_tkip_p2k);
/*
* Encrypt packet payload with TKIP using @key. @pos is a pointer to the
@@ -204,19 +217,15 @@ EXPORT_SYMBOL(ieee80211_get_tkip_key);
*/
int ieee80211_tkip_encrypt_data(struct crypto_cipher *tfm,
struct ieee80211_key *key,
- u8 *pos, size_t payload_len, u8 *ta)
+ struct sk_buff *skb,
+ u8 *payload, size_t payload_len)
{
u8 rc4key[16];
- struct tkip_ctx *ctx = &key->u.tkip.tx;
- const u8 *tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
-
- /* Calculate per-packet key */
- if (ctx->iv16 == 0 || ctx->state == TKIP_STATE_NOT_INIT)
- tkip_mixing_phase1(tk, ctx, ta, ctx->iv32);
- tkip_mixing_phase2(tk, ctx, ctx->iv16, rc4key);
+ ieee80211_get_tkip_p2k(&key->conf, skb, rc4key);
- return ieee80211_wep_encrypt_data(tfm, rc4key, 16, pos, payload_len);
+ return ieee80211_wep_encrypt_data(tfm, rc4key, 16,
+ payload, payload_len);
}
/* Decrypt packet payload with TKIP using @key. @pos is a pointer to the
diff --git a/net/mac80211/tkip.h b/net/mac80211/tkip.h
index 1cab9c86978f..e3ecb659b90a 100644
--- a/net/mac80211/tkip.h
+++ b/net/mac80211/tkip.h
@@ -13,11 +13,13 @@
#include <linux/crypto.h>
#include "key.h"
-u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key, u16 iv16);
+u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key);
int ieee80211_tkip_encrypt_data(struct crypto_cipher *tfm,
- struct ieee80211_key *key,
- u8 *pos, size_t payload_len, u8 *ta);
+ struct ieee80211_key *key,
+ struct sk_buff *skb,
+ u8 *payload, size_t payload_len);
+
enum {
TKIP_DECRYPT_OK = 0,
TKIP_DECRYPT_NO_EXT_IV = -1,
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index d91c1a26630d..4ded2ae48a5f 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -171,6 +171,7 @@ static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_key *key = tx->key;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ unsigned long flags;
unsigned int hdrlen;
int len, tail;
u8 *pos;
@@ -198,11 +199,12 @@ static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
pos += hdrlen;
/* Increase IV for the frame */
+ spin_lock_irqsave(&key->u.tkip.txlock, flags);
key->u.tkip.tx.iv16++;
if (key->u.tkip.tx.iv16 == 0)
key->u.tkip.tx.iv32++;
-
- pos = ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
+ pos = ieee80211_tkip_add_iv(pos, key);
+ spin_unlock_irqrestore(&key->u.tkip.txlock, flags);
/* hwaccel - with software IV */
if (info->control.hw_key)
@@ -211,9 +213,8 @@ static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
/* Add room for ICV */
skb_put(skb, TKIP_ICV_LEN);
- hdr = (struct ieee80211_hdr *) skb->data;
return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
- key, pos, len, hdr->addr2);
+ key, skb, pos, len);
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-01 00:14:01 +0300