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mac80211: remove wep dependency

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The current mac80211 code assumes that WEP is always available.  If WEP
fails to initialize, ieee80211_register_hw will always fail.

In some cases (e.g. FIPS certification), the cryptography used by WEP is
unavailable.  However, in such cases there is no good reason why CCMP
encryption (or even no link level encryption) cannot be used.  So, this
patch removes mac80211's assumption that WEP (and TKIP) will always be
available for use.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
John W. Linville 2010-07-07 15:07:49 -04:00
parent 73e194639d
commit 3473187d24
7 changed files with 30 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/mac80211/cfg.c
View File

@ -143,6 +143,11 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
return -EINVAL;
}
/* reject WEP and TKIP keys if WEP failed to initialize */
if ((alg == ALG_WEP || alg == ALG_TKIP) &&
IS_ERR(sdata->local->wep_tx_tfm))
return -EINVAL;
key = ieee80211_key_alloc(alg, key_idx, params->key_len, params->key,
params->seq_len, params->seq);
if (!key)

5
net/mac80211/main.c
View File

@ -637,11 +637,9 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
goto fail_sta_info;
result = ieee80211_wep_init(local);
if (result < 0) {
if (result < 0)
printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
wiphy_name(local->hw.wiphy), result);
goto fail_wep;
}
rtnl_lock();
@ -694,7 +692,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
fail_rate:
rtnl_unlock();
ieee80211_wep_free(local);
fail_wep:
sta_info_stop(local);
fail_sta_info:
destroy_workqueue(local->workqueue);

8
net/mac80211/tkip.c
View File

@ -202,9 +202,9 @@ EXPORT_SYMBOL(ieee80211_get_tkip_key);
* @payload_len is the length of payload (_not_ including IV/ICV length).
* @ta is the transmitter addresses.
*/
void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
struct ieee80211_key *key,
u8 *pos, size_t payload_len, u8 *ta)
int ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
struct ieee80211_key *key,
u8 *pos, size_t payload_len, u8 *ta)
{
u8 rc4key[16];
struct tkip_ctx *ctx = &key->u.tkip.tx;
@ -216,7 +216,7 @@ void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
tkip_mixing_phase2(tk, ctx, ctx->iv16, rc4key);
ieee80211_wep_encrypt_data(tfm, rc4key, 16, pos, payload_len);
return ieee80211_wep_encrypt_data(tfm, rc4key, 16, pos, payload_len);
}
/* Decrypt packet payload with TKIP using @key. @pos is a pointer to the

2
net/mac80211/tkip.h
View File

@ -15,7 +15,7 @@
u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key, u16 iv16);
void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
int ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
struct ieee80211_key *key,
u8 *pos, size_t payload_len, u8 *ta);
enum {

24
net/mac80211/wep.c
View File

@ -47,8 +47,10 @@ int ieee80211_wep_init(struct ieee80211_local *local)
void ieee80211_wep_free(struct ieee80211_local *local)
{
crypto_free_blkcipher(local->wep_tx_tfm);
crypto_free_blkcipher(local->wep_rx_tfm);
if (!IS_ERR(local->wep_tx_tfm))
crypto_free_blkcipher(local->wep_tx_tfm);
if (!IS_ERR(local->wep_rx_tfm))
crypto_free_blkcipher(local->wep_rx_tfm);
}
static inline bool ieee80211_wep_weak_iv(u32 iv, int keylen)
@ -122,19 +124,24 @@ static void ieee80211_wep_remove_iv(struct ieee80211_local *local,
/* Perform WEP encryption using given key. data buffer must have tailroom
* for 4-byte ICV. data_len must not include this ICV. Note: this function
* does _not_ add IV. data = RC4(data | CRC32(data)) */
void ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
size_t klen, u8 *data, size_t data_len)
int ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
size_t klen, u8 *data, size_t data_len)
{
struct blkcipher_desc desc = { .tfm = tfm };
struct scatterlist sg;
__le32 icv;
if (IS_ERR(tfm))
return -1;
icv = cpu_to_le32(~crc32_le(~0, data, data_len));
put_unaligned(icv, (__le32 *)(data + data_len));
crypto_blkcipher_setkey(tfm, rc4key, klen);
sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
crypto_blkcipher_encrypt(&desc, &sg, &sg, sg.length);
return 0;
}
@ -168,10 +175,8 @@ int ieee80211_wep_encrypt(struct ieee80211_local *local,
/* Add room for ICV */
skb_put(skb, WEP_ICV_LEN);
ieee80211_wep_encrypt_data(local->wep_tx_tfm, rc4key, keylen + 3,
iv + WEP_IV_LEN, len);
return 0;
return ieee80211_wep_encrypt_data(local->wep_tx_tfm, rc4key, keylen + 3,
iv + WEP_IV_LEN, len);
}
@ -185,6 +190,9 @@ int ieee80211_wep_decrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
struct scatterlist sg;
__le32 crc;
if (IS_ERR(tfm))
return -1;
crypto_blkcipher_setkey(tfm, rc4key, klen);
sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
crypto_blkcipher_decrypt(&desc, &sg, &sg, sg.length);

2
net/mac80211/wep.h
View File

@ -18,7 +18,7 @@
int ieee80211_wep_init(struct ieee80211_local *local);
void ieee80211_wep_free(struct ieee80211_local *local);
void ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
int ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
size_t klen, u8 *data, size_t data_len);
int ieee80211_wep_encrypt(struct ieee80211_local *local,
struct sk_buff *skb,

5
net/mac80211/wpa.c
View File

@ -183,9 +183,8 @@ static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
skb_put(skb, TKIP_ICV_LEN);
hdr = (struct ieee80211_hdr *) skb->data;
ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
key, pos, len, hdr->addr2);
return 0;
return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
key, pos, len, hdr->addr2);
}