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authorJohannes Berg <johannes.berg@intel.com>2011-07-07 22:28:01 +0200
committerJohn W. Linville <linville@tuxdriver.com>2011-07-08 11:11:19 -0400
commit523b02ea23b175dd3e46e3daf1bc9354376640a3 (patch)
treea11f69f05cdfb457a42b2866e33e73937c35ec1e /net/mac80211/tkip.c
parent397915c30731340ee3f348d1be597b22467acbdf (diff)
downloadop-kernel-dev-523b02ea23b175dd3e46e3daf1bc9354376640a3.zip
op-kernel-dev-523b02ea23b175dd3e46e3daf1bc9354376640a3.tar.gz
mac80211: fix TKIP races, make API easier to use
Our current TKIP code races against itself on TX since we can process multiple packets at the same time on different ACs, but they all share the TX context for TKIP. This can lead to bad IVs etc. Also, the crypto offload helper code just obtains the P1K/P2K from the cache, and can update it as well, but there's no guarantee that packets are really processed in order. To fix these issues, first introduce a spinlock that will protect the IV16/IV32 values in the TX context. This first step makes sure that we don't assign the same IV multiple times or get confused in other ways. Secondly, change the way the P1K cache works. I add a field "p1k_iv32" that stores the value of the IV32 when the P1K was last recomputed, and if different from the last time, then a new P1K is recomputed. This can cause the P1K computation to flip back and forth if packets are processed out of order. All this also happens under the new spinlock. Finally, because there are argument differences, split up the ieee80211_get_tkip_key() API into ieee80211_get_tkip_p1k() and ieee80211_get_tkip_p2k() and give them the correct arguments. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/tkip.c')
-rw-r--r--net/mac80211/tkip.c111
1 files changed, 60 insertions, 51 deletions
diff --git a/net/mac80211/tkip.c b/net/mac80211/tkip.c
index 757e4eb..de570b3 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
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