cam.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright( c ) 2009-2012  Realtek Corporation.*/

#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 );

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

			rtl_dbg( rtlpriv, COMP_SEC, DBG_LOUD,
				"WRITE A4: %x\n", target_content );
			rtl_dbg( 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 );

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

	rtl_dbg( 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 );

	rtl_dbg( 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 ) {
		rtl_dbg( 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 );

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

	return 1;

}
EXPORT_SYMBOL( rtl_cam_add_one_entry );

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 );

	rtl_dbg( 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 );

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

	return 0;

}
EXPORT_SYMBOL( rtl_cam_delete_one_entry );

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 );
}
EXPORT_SYMBOL( rtl_cam_reset_all_entry );

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;

	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 );

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

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;
	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 );

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

}
EXPORT_SYMBOL( rtl_cam_empty_entry );

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 ( NULL == 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;
}
EXPORT_SYMBOL( rtl_cam_get_free_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 ( NULL == 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 );
			rtl_dbg( rtlpriv, COMP_SEC, DBG_DMESG,
				"&&&&&&&&&del entry %d\n", i );
		}
	}
	return;
}
EXPORT_SYMBOL( rtl_cam_del_entry );