diff options
Diffstat (limited to 'drivers/net/wireless/b43/main.c')
| -rw-r--r-- | drivers/net/wireless/b43/main.c | 122 |
1 files changed, 120 insertions, 2 deletions
diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c index 78ddbc7f836b..f5bdf1cae1d1 100644 --- a/drivers/net/wireless/b43/main.c +++ b/drivers/net/wireless/b43/main.c @@ -80,6 +80,10 @@ static int modparam_nohwcrypt; module_param_named(nohwcrypt, modparam_nohwcrypt, int, 0444); MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption."); +static int modparam_hwtkip; +module_param_named(hwtkip, modparam_hwtkip, int, 0444); +MODULE_PARM_DESC(hwtkip, "Enable hardware tkip."); + static int modparam_qos = 1; module_param_named(qos, modparam_qos, int, 0444); MODULE_PARM_DESC(qos, "Enable QOS support (default on)"); @@ -834,6 +838,85 @@ static void keymac_write(struct b43_wldev *dev, u8 index, const u8 *addr) (index * 2) + 1, addrtmp[1]); } +/* The ucode will use phase1 key with TEK key to decrypt rx packets. + * When a packet is received, the iv32 is checked. + * - if it doesn't the packet is returned without modification (and software + * decryption can be done). That's what happen when iv16 wrap. + * - if it does, the rc4 key is computed, and decryption is tried. + * Either it will success and B43_RX_MAC_DEC is returned, + * either it fails and B43_RX_MAC_DEC|B43_RX_MAC_DECERR is returned + * and the packet is not usable (it got modified by the ucode). + * So in order to never have B43_RX_MAC_DECERR, we should provide + * a iv32 and phase1key that match. Because we drop packets in case of + * B43_RX_MAC_DECERR, if we have a correct iv32 but a wrong phase1key, all + * packets will be lost without higher layer knowing (ie no resync possible + * until next wrap). + * + * NOTE : this should support 50 key like RCMTA because + * (B43_SHM_SH_KEYIDXBLOCK - B43_SHM_SH_TKIPTSCTTAK)/14 = 50 + */ +static void rx_tkip_phase1_write(struct b43_wldev *dev, u8 index, u32 iv32, + u16 *phase1key) +{ + unsigned int i; + u32 offset; + u8 pairwise_keys_start = B43_NR_GROUP_KEYS * 2; + + if (!modparam_hwtkip) + return; + + if (b43_new_kidx_api(dev)) + pairwise_keys_start = B43_NR_GROUP_KEYS; + + B43_WARN_ON(index < pairwise_keys_start); + /* We have four default TX keys and possibly four default RX keys. + * Physical mac 0 is mapped to physical key 4 or 8, depending + * on the firmware version. + * So we must adjust the index here. + */ + index -= pairwise_keys_start; + B43_WARN_ON(index >= B43_NR_PAIRWISE_KEYS); + + if (b43_debug(dev, B43_DBG_KEYS)) { + b43dbg(dev->wl, "rx_tkip_phase1_write : idx 0x%x, iv32 0x%x\n", + index, iv32); + } + /* Write the key to the RX tkip shared mem */ + offset = B43_SHM_SH_TKIPTSCTTAK + index * (10 + 4); + for (i = 0; i < 10; i += 2) { + b43_shm_write16(dev, B43_SHM_SHARED, offset + i, + phase1key ? phase1key[i / 2] : 0); + } + b43_shm_write16(dev, B43_SHM_SHARED, offset + i, iv32); + b43_shm_write16(dev, B43_SHM_SHARED, offset + i + 2, iv32 >> 16); +} + +static void b43_op_update_tkip_key(struct ieee80211_hw *hw, + struct ieee80211_key_conf *keyconf, const u8 *addr, + u32 iv32, u16 *phase1key) +{ + struct b43_wl *wl = hw_to_b43_wl(hw); + struct b43_wldev *dev; + int index = keyconf->hw_key_idx; + + if (B43_WARN_ON(!modparam_hwtkip)) + return; + + mutex_lock(&wl->mutex); + + dev = wl->current_dev; + if (!dev || b43_status(dev) < B43_STAT_INITIALIZED) + goto out_unlock; + + keymac_write(dev, index, NULL); /* First zero out mac to avoid race */ + + rx_tkip_phase1_write(dev, index, iv32, phase1key); + keymac_write(dev, index, addr); + +out_unlock: + mutex_unlock(&wl->mutex); +} + static void do_key_write(struct b43_wldev *dev, u8 index, u8 algorithm, const u8 *key, size_t key_len, const u8 *mac_addr) @@ -849,6 +932,19 @@ static void do_key_write(struct b43_wldev *dev, if (index >= pairwise_keys_start) keymac_write(dev, index, NULL); /* First zero out mac. */ + if (algorithm == B43_SEC_ALGO_TKIP) { + /* + * We should provide an initial iv32, phase1key pair. + * We could start with iv32=0 and compute the corresponding + * phase1key, but this means calling ieee80211_get_tkip_key + * with a fake skb (or export other tkip function). + * Because we are lazy we hope iv32 won't start with + * 0xffffffff and let's b43_op_update_tkip_key provide a + * correct pair. + */ + rx_tkip_phase1_write(dev, index, 0xffffffff, (u16*)buf); + } else if (index >= pairwise_keys_start) /* clear it */ + rx_tkip_phase1_write(dev, index, 0, NULL); if (key) memcpy(buf, key, key_len); key_write(dev, index, algorithm, buf); @@ -867,6 +963,15 @@ static int b43_key_write(struct b43_wldev *dev, int i; int pairwise_keys_start; + /* For ALG_TKIP the key is encoded as a 256-bit (32 byte) data block: + * - Temporal Encryption Key (128 bits) + * - Temporal Authenticator Tx MIC Key (64 bits) + * - Temporal Authenticator Rx MIC Key (64 bits) + * + * Hardware only store TEK + */ + if (algorithm == B43_SEC_ALGO_TKIP && key_len == 32) + key_len = 16; if (key_len > B43_SEC_KEYSIZE) return -EINVAL; for (i = 0; i < ARRAY_SIZE(dev->key); i++) { @@ -973,6 +1078,14 @@ static void b43_dump_keymemory(struct b43_wldev *dev) printk(" Algo: %04X/%02X", algo, key->algorithm); if (index >= pairwise_keys_start) { + if (key->algorithm == B43_SEC_ALGO_TKIP) { + printk(" TKIP: "); + offset = B43_SHM_SH_TKIPTSCTTAK + (index - 4) * (10 + 4); + for (i = 0; i < 14; i += 2) { + u16 tmp = b43_shm_read16(dev, B43_SHM_SHARED, offset + i); + printk("%02X%02X", (tmp & 0xFF), ((tmp >> 8) & 0xFF)); + } + } rcmta0 = b43_shm_read32(dev, B43_SHM_RCMTA, ((index - pairwise_keys_start) * 2) + 0); rcmta1 = b43_shm_read16(dev, B43_SHM_RCMTA, @@ -3620,8 +3733,10 @@ static int b43_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd, switch (cmd) { case SET_KEY: - if (algorithm == B43_SEC_ALGO_TKIP) { - /* FIXME: No TKIP hardware encryption for now. */ + if (algorithm == B43_SEC_ALGO_TKIP && + (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE) || + !modparam_hwtkip)) { + /* We support only pairwise key */ err = -EOPNOTSUPP; goto out_unlock; } @@ -3651,6 +3766,8 @@ static int b43_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd, b43_hf_read(dev) & ~B43_HF_USEDEFKEYS); } key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV; + if (algorithm == B43_SEC_ALGO_TKIP) + key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC; break; case DISABLE_KEY: { err = b43_key_clear(dev, key->hw_key_idx); @@ -4378,6 +4495,7 @@ static const struct ieee80211_ops b43_hw_ops = { .bss_info_changed = b43_op_bss_info_changed, .configure_filter = b43_op_configure_filter, .set_key = b43_op_set_key, + .update_tkip_key = b43_op_update_tkip_key, .get_stats = b43_op_get_stats, .get_tx_stats = b43_op_get_tx_stats, .get_tsf = b43_op_get_tsf, |