cam.c

  1// SPDX-License-Identifier: GPL-2.0
  2/* Copyright(c) 2009-2012  Realtek Corporation.*/
  3
  4#include "wifi.h"
  5#include "cam.h"
  6#include <linux/export.h>
  7
  8void rtl_cam_reset_sec_info(struct ieee80211_hw *hw)
  9{
 10	struct rtl_priv *rtlpriv = rtl_priv(hw);
 11
 12	rtlpriv->sec.use_defaultkey = false;
 13	rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
 14	rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
 15	memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
 16	memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
 17	rtlpriv->sec.pairwise_key = NULL;
 18}
 19
 20static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
 21				  const u8 *mac_addr, u8 *key_cont_128,
 22				  u16 us_config)
 23{
 24	struct rtl_priv *rtlpriv = rtl_priv(hw);
 25
 26	u32 target_command;
 27	u32 target_content = 0;
 28	int entry_i;
 29
 30	RT_PRINT_DATA(rtlpriv, COMP_SEC, DBG_DMESG, "Key content :",
 31		      key_cont_128, 16);
 32
 33	/* 0-1 config + mac, 2-5 fill 128key,6-7 are reserved */
 34	for (entry_i = CAM_CONTENT_COUNT - 1; entry_i >= 0; entry_i--) {
 35		target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
 36		target_command = target_command | BIT(31) | BIT(16);
 37
 38		if (entry_i == 0) {
 39			target_content = (u32) (*(mac_addr + 0)) << 16 |
 40			    (u32) (*(mac_addr + 1)) << 24 | (u32) us_config;
 41
 42			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 43					target_content);
 44			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 45					target_command);
 46
 47			rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
 48				"WRITE %x: %x\n",
 49				rtlpriv->cfg->maps[WCAMI], target_content);
 50			rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
 51				"The Key ID is %d\n", entry_no);
 52			rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
 53				"WRITE %x: %x\n",
 54				rtlpriv->cfg->maps[RWCAM], target_command);
 55
 56		} else if (entry_i == 1) {
 57
 58			target_content = (u32) (*(mac_addr + 5)) << 24 |
 59			    (u32) (*(mac_addr + 4)) << 16 |
 60			    (u32) (*(mac_addr + 3)) << 8 |
 61			    (u32) (*(mac_addr + 2));
 62
 63			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 64					target_content);
 65			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 66					target_command);
 67
 68			rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
 69				"WRITE A4: %x\n", target_content);
 70			rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
 71				"WRITE A0: %x\n", target_command);
 72
 73		} else {
 74
 75			target_content =
 76			    (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
 77			    24 | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 2))
 78			    << 16 |
 79			    (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
 80			    | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 0));
 81
 82			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
 83					target_content);
 84			rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
 85					target_command);
 86
 87			rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
 88				"WRITE A4: %x\n", target_content);
 89			rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
 90				"WRITE A0: %x\n", target_command);
 91		}
 92	}
 93
 94	rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
 95		"after set key, usconfig:%x\n", us_config);
 96}
 97
 98u8 rtl_cam_add_one_entry(struct ieee80211_hw *hw, const u8 *mac_addr,
 99			 u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
100			 u32 ul_default_key, u8 *key_content)
101{
102	u32 us_config;
103	struct rtl_priv *rtlpriv = rtl_priv(hw);
104
105	rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
106		"EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
107		ul_entry_idx, ul_key_id, ul_enc_alg,
108		ul_default_key, mac_addr);
109
110	if (ul_key_id == TOTAL_CAM_ENTRY) {
111		rtl_dbg(rtlpriv, COMP_ERR, DBG_WARNING,
112			"ulKeyId exceed!\n");
113		return 0;
114	}
115
116	if (ul_default_key == 1)
117		us_config = CFG_VALID | ((u16) (ul_enc_alg) << 2);
118	else
119		us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;
120
121	rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
122			      (u8 *)key_content, us_config);
123
124	rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG, "end\n");
125
126	return 1;
127
128}
129EXPORT_SYMBOL(rtl_cam_add_one_entry);
130
131int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
132			     u8 *mac_addr, u32 ul_key_id)
133{
134	u32 ul_command;
135	struct rtl_priv *rtlpriv = rtl_priv(hw);
136
137	rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG, "key_idx:%d\n", ul_key_id);
138
139	ul_command = ul_key_id * CAM_CONTENT_COUNT;
140	ul_command = ul_command | BIT(31) | BIT(16);
141
142	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
143	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
144
145	rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
146		"%s: WRITE A4: %x\n", __func__, 0);
147	rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
148		"%s: WRITE A0: %x\n", __func__, ul_command);
149
150	return 0;
151
152}
153EXPORT_SYMBOL(rtl_cam_delete_one_entry);
154
155void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
156{
157	u32 ul_command;
158	struct rtl_priv *rtlpriv = rtl_priv(hw);
159
160	ul_command = BIT(31) | BIT(30);
161	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
162}
163EXPORT_SYMBOL(rtl_cam_reset_all_entry);
164
165void rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
166{
167	struct rtl_priv *rtlpriv = rtl_priv(hw);
168
169	u32 ul_command;
170	u32 ul_content;
171	u32 ul_enc_algo;
172
173	switch (rtlpriv->sec.pairwise_enc_algorithm) {
174	case WEP40_ENCRYPTION:
175		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
176		break;
177	case WEP104_ENCRYPTION:
178		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
179		break;
180	case TKIP_ENCRYPTION:
181		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
182		break;
183	case AESCCMP_ENCRYPTION:
184		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
185		break;
186	default:
187		ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
188	}
189
190	ul_content = (uc_index & 3) | ((u16) (ul_enc_algo) << 2);
191
192	ul_content |= BIT(15);
193	ul_command = CAM_CONTENT_COUNT * uc_index;
194	ul_command = ul_command | BIT(31) | BIT(16);
195
196	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
197	rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
198
199	rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
200		"%s: WRITE A4: %x\n", __func__, ul_content);
201	rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
202		"%s: WRITE A0: %x\n", __func__, ul_command);
203}
204EXPORT_SYMBOL(rtl_cam_mark_invalid);
205
206void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
207{
208	struct rtl_priv *rtlpriv = rtl_priv(hw);
209
210	u32 ul_command;
211	u32 ul_content;
212	u32 ul_encalgo;
213	u8 entry_i;
214
215	switch (rtlpriv->sec.pairwise_enc_algorithm) {
216	case WEP40_ENCRYPTION:
217		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
218		break;
219	case WEP104_ENCRYPTION:
220		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
221		break;
222	case TKIP_ENCRYPTION:
223		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
224		break;
225	case AESCCMP_ENCRYPTION:
226		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
227		break;
228	default:
229		ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
230	}
231
232	for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
233
234		if (entry_i == 0) {
235			ul_content =
236			    (uc_index & 0x03) | ((u16) (ul_encalgo) << 2);
237			ul_content |= BIT(15);
238
239		} else {
240			ul_content = 0;
241		}
242
243		ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
244		ul_command = ul_command | BIT(31) | BIT(16);
245
246		rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
247		rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
248
249		rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
250			"%s: WRITE A4: %x\n", __func__, ul_content);
251		rtl_dbg(rtlpriv, COMP_SEC, DBG_LOUD,
252			"%s: WRITE A0: %x\n", __func__, ul_command);
253	}
254
255}
256EXPORT_SYMBOL(rtl_cam_empty_entry);
257
258u8 rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
259{
260	struct rtl_priv *rtlpriv = rtl_priv(hw);
261	u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
262	u8 entry_idx = 0;
263	u8 i, *addr;
264
265	if (NULL == sta_addr) {
266		pr_err("sta_addr is NULL.\n");
267		return TOTAL_CAM_ENTRY;
268	}
269	/* Does STA already exist? */
270	for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
271		addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
272		if (ether_addr_equal_unaligned(addr, sta_addr))
273			return i;
274	}
275	/* Get a free CAM entry. */
276	for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
277		if ((bitmap & BIT(0)) == 0) {
278			pr_err("-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
279			       rtlpriv->sec.hwsec_cam_bitmap, entry_idx);
280			rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
281			memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
282			       sta_addr, ETH_ALEN);
283			return entry_idx;
284		}
285		bitmap = bitmap >> 1;
286	}
287	return TOTAL_CAM_ENTRY;
288}
289EXPORT_SYMBOL(rtl_cam_get_free_entry);
290
291void rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
292{
293	struct rtl_priv *rtlpriv = rtl_priv(hw);
294	u32 bitmap;
295	u8 i, *addr;
296
297	if (NULL == sta_addr) {
298		pr_err("sta_addr is NULL.\n");
299		return;
300	}
301
302	if (is_zero_ether_addr(sta_addr)) {
303		pr_err("sta_addr is %pM\n", sta_addr);
304		return;
305	}
306	/* Does STA already exist? */
307	for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
308		addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
309		bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
310		if (((bitmap & BIT(0)) == BIT(0)) &&
311		    (ether_addr_equal_unaligned(addr, sta_addr))) {
312			/* Remove from HW Security CAM */
313			eth_zero_addr(rtlpriv->sec.hwsec_cam_sta_addr[i]);
314			rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
315			rtl_dbg(rtlpriv, COMP_SEC, DBG_DMESG,
316				"&&&&&&&&&del entry %d\n", i);
317		}
318	}
319	return;
320}
321EXPORT_SYMBOL(rtl_cam_del_entry);