drivers/staging/rtlwifi/cam.c

/******************************************************************************
 *
 * Copyright(c) 2009-2012  Realtek Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 * wlanfae <wlanfae@realtek.com>
 * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
 * Hsinchu 300, Taiwan.
 *
 * Larry Finger <Larry.Finger@lwfinger.net>
 *
 *****************************************************************************/
#include "wifi.h"
#include "cam.h"
#include <linux/export.h>

void rtl_cam_reset_sec_info(struct ieee80211_hw *hw)
{
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	rtlpriv->sec.use_defaultkey = false;
	rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
	rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
	memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
	memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
	rtlpriv->sec.pairwise_key = NULL;
}

static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
				  u8 *mac_addr, u8 *key_cont_128, u16 us_config)
{
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	u32 target_command;
	u32 target_content = 0;
	int entry_i;

	RT_PRINT_DATA(rtlpriv, COMP_SEC, DBG_DMESG, "Key content :",
		      key_cont_128, 16);

	/* 0-1 config + mac, 2-5 fill 128key,6-7 are reserved */
	for (entry_i = CAM_CONTENT_COUNT - 1; entry_i >= 0; entry_i--) {
		target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
		target_command = target_command | BIT(31) | BIT(16);

		if (entry_i == 0) {
			target_content = (u32)(*(mac_addr + 0)) << 16 |
					 (u32)(*(mac_addr + 1)) << 24 |
					 (u32)us_config;

			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
					target_content);
			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
					target_command);

			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
				 "WRITE %x: %x\n",
				 rtlpriv->cfg->maps[WCAMI], target_content);
			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
				 "The Key ID is %d\n", entry_no);
			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
				 "WRITE %x: %x\n",
				 rtlpriv->cfg->maps[RWCAM], target_command);

		} else if (entry_i == 1) {
			target_content = (u32)(*(mac_addr + 5)) << 24 |
					 (u32)(*(mac_addr + 4)) << 16 |
					 (u32)(*(mac_addr + 3)) << 8 |
					 (u32)(*(mac_addr + 2));

			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
					target_content);
			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
					target_command);

			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
				 "WRITE A4: %x\n", target_content);
			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
				 "WRITE A0: %x\n", target_command);
		} else {
			target_content =
			    (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
			    24 | (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 2))
			    << 16 |
			    (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
			    | (u32)(*(key_cont_128 + (entry_i * 4 - 8) + 0));

			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
					target_content);
			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
					target_command);

			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
				 "WRITE A4: %x\n", target_content);
			RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
				 "WRITE A0: %x\n", target_command);
		}
	}

	RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
		 "after set key, usconfig:%x\n", us_config);
}

u8 rtl_cam_add_one_entry(struct ieee80211_hw *hw, u8 *mac_addr,
			 u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
			 u32 ul_default_key, u8 *key_content)
{
	u32 us_config;
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
		 "EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
		 ul_entry_idx, ul_key_id, ul_enc_alg,
		 ul_default_key, mac_addr);

	if (ul_key_id == TOTAL_CAM_ENTRY) {
		RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
			 "ulKeyId exceed!\n");
		return 0;
	}

	if (ul_default_key == 1)
		us_config = CFG_VALID | ((u16)(ul_enc_alg) << 2);
	else
		us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;

	rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
			      (u8 *)key_content, us_config);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "end\n");

	return 1;
}

int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
			     u8 *mac_addr, u32 ul_key_id)
{
	u32 ul_command;
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "key_idx:%d\n", ul_key_id);

	ul_command = ul_key_id * CAM_CONTENT_COUNT;
	ul_command = ul_command | BIT(31) | BIT(16);

	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
		 "%s(): WRITE A4: %x\n", __func__, 0);
	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
		 "%s(): WRITE A0: %x\n", __func__, ul_command);

	return 0;
}

void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
{
	u32 ul_command;
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	ul_command = BIT(31) | BIT(30);
	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
}

void rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
{
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	u32 ul_command;
	u32 ul_content;
	u32 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];

	switch (rtlpriv->sec.pairwise_enc_algorithm) {
	case WEP40_ENCRYPTION:
		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
		break;
	case WEP104_ENCRYPTION:
		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
		break;
	case TKIP_ENCRYPTION:
		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
		break;
	case AESCCMP_ENCRYPTION:
		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
		break;
	default:
		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
	}

	ul_content = (uc_index & 3) | ((u16)(ul_enc_algo) << 2);

	ul_content |= BIT(15);
	ul_command = CAM_CONTENT_COUNT * uc_index;
	ul_command = ul_command | BIT(31) | BIT(16);

	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);

	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
		 "%s(): WRITE A4: %x\n", __func__, ul_content);
	RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
		 "%s(): WRITE A0: %x\n", __func__, ul_command);
}

void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
{
	struct rtl_priv *rtlpriv = rtl_priv(hw);

	u32 ul_command;
	u32 ul_content;
	u32 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
	u8 entry_i;

	switch (rtlpriv->sec.pairwise_enc_algorithm) {
	case WEP40_ENCRYPTION:
		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
		break;
	case WEP104_ENCRYPTION:
		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
		break;
	case TKIP_ENCRYPTION:
		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
		break;
	case AESCCMP_ENCRYPTION:
		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
		break;
	default:
		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
	}

	for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
		if (entry_i == 0) {
			ul_content =
			    (uc_index & 0x03) | ((u16)(ul_encalgo) << 2);
			ul_content |= BIT(15);
		} else {
			ul_content = 0;
		}

		ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
		ul_command = ul_command | BIT(31) | BIT(16);

		rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
		rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);

		RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
			 "%s(): WRITE A4: %x\n", __func__, ul_content);
		RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
			 "%s(): WRITE A0: %x\n", __func__, ul_command);
	}
}

u8 rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
{
	struct rtl_priv *rtlpriv = rtl_priv(hw);
	u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
	u8 entry_idx = 0;
	u8 i, *addr;

	if (!sta_addr) {
		pr_err("sta_addr is NULL.\n");
		return TOTAL_CAM_ENTRY;
	}
	/* Does STA already exist? */
	for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
		addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
		if (ether_addr_equal_unaligned(addr, sta_addr))
			return i;
	}
	/* Get a free CAM entry. */
	for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
		if ((bitmap & BIT(0)) == 0) {
			pr_err("-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
			       rtlpriv->sec.hwsec_cam_bitmap, entry_idx);
			rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
			memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
			       sta_addr, ETH_ALEN);
			return entry_idx;
		}
		bitmap = bitmap >> 1;
	}
	return TOTAL_CAM_ENTRY;
}

void rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
{
	struct rtl_priv *rtlpriv = rtl_priv(hw);
	u32 bitmap;
	u8 i, *addr;

	if (!sta_addr) {
		pr_err("sta_addr is NULL.\n");
		return;
	}

	if (is_zero_ether_addr(sta_addr)) {
		pr_err("sta_addr is %pM\n", sta_addr);
		return;
	}
	/* Does STA already exist? */
	for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
		addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
		bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
		if (((bitmap & BIT(0)) == BIT(0)) &&
		    (ether_addr_equal_unaligned(addr, sta_addr))) {
			/* Remove from HW Security CAM */
			eth_zero_addr(rtlpriv->sec.hwsec_cam_sta_addr[i]);
			rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
			RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
				 "&&&&&&&&&del entry %d\n", i);
		}
	}
}