drivers/net/wireless/intel/iwlwifi/dvm/lib.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/intel/iwlwifi/dvm/lib.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/intel/iwlwifi/dvm/lib.c
Extension
.c
Size
36807 bytes
Lines
1259
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct wowlan_key_data {
	struct iwl_rxon_context *ctx;
	struct iwlagn_wowlan_rsc_tsc_params_cmd *rsc_tsc;
	struct iwlagn_wowlan_tkip_params_cmd *tkip;
	const u8 *bssid;
	bool error, use_rsc_tsc, use_tkip;
};


static void iwlagn_wowlan_program_keys(struct ieee80211_hw *hw,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct ieee80211_key_conf *key,
			       void *_data)
{
	struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
	struct wowlan_key_data *data = _data;
	struct iwl_rxon_context *ctx = data->ctx;
	struct aes_sc *aes_sc, *aes_tx_sc = NULL;
	struct tkip_sc *tkip_sc, *tkip_tx_sc = NULL;
	struct iwlagn_p1k_cache *rx_p1ks;
	u8 *rx_mic_key;
	struct ieee80211_key_seq seq;
	u32 cur_rx_iv32 = 0;
	u16 p1k[IWLAGN_P1K_SIZE];
	int ret, i;

	mutex_lock(&priv->mutex);

	if ((key->cipher == WLAN_CIPHER_SUITE_WEP40 ||
	     key->cipher == WLAN_CIPHER_SUITE_WEP104) &&
	     !sta && !ctx->key_mapping_keys)
		ret = iwl_set_default_wep_key(priv, ctx, key);
	else
		ret = iwl_set_dynamic_key(priv, ctx, key, sta);

	if (ret) {
		IWL_ERR(priv, "Error setting key during suspend!\n");
		data->error = true;
	}

	switch (key->cipher) {
	case WLAN_CIPHER_SUITE_TKIP:
		if (sta) {
			u64 pn64;

			tkip_sc = data->rsc_tsc->all_tsc_rsc.tkip.unicast_rsc;
			tkip_tx_sc = &data->rsc_tsc->all_tsc_rsc.tkip.tsc;

			rx_p1ks = data->tkip->rx_uni;

			pn64 = atomic64_read(&key->tx_pn);
			tkip_tx_sc->iv16 = cpu_to_le16(TKIP_PN_TO_IV16(pn64));
			tkip_tx_sc->iv32 = cpu_to_le32(TKIP_PN_TO_IV32(pn64));

			ieee80211_get_tkip_p1k_iv(key, seq.tkip.iv32, p1k);
			iwlagn_convert_p1k(p1k, data->tkip->tx.p1k);

			memcpy(data->tkip->mic_keys.tx,
			       &key->key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
			       IWLAGN_MIC_KEY_SIZE);

			rx_mic_key = data->tkip->mic_keys.rx_unicast;
		} else {
			tkip_sc =
				data->rsc_tsc->all_tsc_rsc.tkip.multicast_rsc;
			rx_p1ks = data->tkip->rx_multi;
			rx_mic_key = data->tkip->mic_keys.rx_mcast;
		}

		/*
		 * For non-QoS this relies on the fact that both the uCode and
		 * mac80211 use TID 0 (as they need to to avoid replay attacks)
		 * for checking the IV in the frames.
		 */
		for (i = 0; i < IWLAGN_NUM_RSC; i++) {
			ieee80211_get_key_rx_seq(key, i, &seq);
			tkip_sc[i].iv16 = cpu_to_le16(seq.tkip.iv16);
			tkip_sc[i].iv32 = cpu_to_le32(seq.tkip.iv32);
			/* wrapping isn't allowed, AP must rekey */
			if (seq.tkip.iv32 > cur_rx_iv32)
				cur_rx_iv32 = seq.tkip.iv32;
		}

		ieee80211_get_tkip_rx_p1k(key, data->bssid, cur_rx_iv32, p1k);
		iwlagn_convert_p1k(p1k, rx_p1ks[0].p1k);
		ieee80211_get_tkip_rx_p1k(key, data->bssid,
					  cur_rx_iv32 + 1, p1k);
		iwlagn_convert_p1k(p1k, rx_p1ks[1].p1k);

Annotation

Implementation Notes