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cam.c
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1 /******************************************************************************
2  *
3  * Copyright(c) 2009-2012 Realtek Corporation.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of version 2 of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17  *
18  * The full GNU General Public License is included in this distribution in the
19  * file called LICENSE.
20  *
21  * Contact Information:
22  * wlanfae <[email protected]>
23  * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
24  * Hsinchu 300, Taiwan.
25  *
26  * Larry Finger <[email protected]>
27  *
28  *****************************************************************************/
29 
30 #include <linux/export.h>
31 #include "wifi.h"
32 #include "cam.h"
33 
34 void rtl_cam_reset_sec_info(struct ieee80211_hw *hw)
35 {
36  struct rtl_priv *rtlpriv = rtl_priv(hw);
37 
38  rtlpriv->sec.use_defaultkey = false;
39  rtlpriv->sec.pairwise_enc_algorithm = NO_ENCRYPTION;
40  rtlpriv->sec.group_enc_algorithm = NO_ENCRYPTION;
41  memset(rtlpriv->sec.key_buf, 0, KEY_BUF_SIZE * MAX_KEY_LEN);
42  memset(rtlpriv->sec.key_len, 0, KEY_BUF_SIZE);
43  rtlpriv->sec.pairwise_key = NULL;
44 }
45 
46 static void rtl_cam_program_entry(struct ieee80211_hw *hw, u32 entry_no,
47  u8 *mac_addr, u8 *key_cont_128, u16 us_config)
48 {
49  struct rtl_priv *rtlpriv = rtl_priv(hw);
50 
51  u32 target_command;
52  u32 target_content = 0;
53  u8 entry_i;
54 
55  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
56  "key_cont_128:\n %x:%x:%x:%x:%x:%x\n",
57  key_cont_128[0], key_cont_128[1],
58  key_cont_128[2], key_cont_128[3],
59  key_cont_128[4], key_cont_128[5]);
60 
61  for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
62  target_command = entry_i + CAM_CONTENT_COUNT * entry_no;
63  target_command = target_command | BIT(31) | BIT(16);
64 
65  if (entry_i == 0) {
66  target_content = (u32) (*(mac_addr + 0)) << 16 |
67  (u32) (*(mac_addr + 1)) << 24 | (u32) us_config;
68 
69  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
70  target_content);
71  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
72  target_command);
73 
74  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE %x: %x\n",
75  rtlpriv->cfg->maps[WCAMI], target_content);
76  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
77  "The Key ID is %d\n", entry_no);
78  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE %x: %x\n",
79  rtlpriv->cfg->maps[RWCAM], target_command);
80 
81  } else if (entry_i == 1) {
82 
83  target_content = (u32) (*(mac_addr + 5)) << 24 |
84  (u32) (*(mac_addr + 4)) << 16 |
85  (u32) (*(mac_addr + 3)) << 8 |
86  (u32) (*(mac_addr + 2));
87 
88  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
89  target_content);
90  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
91  target_command);
92 
93  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE A4: %x\n",
94  target_content);
95  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE A0: %x\n",
96  target_command);
97 
98  } else {
99 
100  target_content =
101  (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 3)) <<
102  24 | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 2))
103  << 16 |
104  (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 1)) << 8
105  | (u32) (*(key_cont_128 + (entry_i * 4 - 8) + 0));
106 
107  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI],
108  target_content);
109  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM],
110  target_command);
111  udelay(100);
112 
113  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE A4: %x\n",
114  target_content);
115  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "WRITE A0: %x\n",
116  target_command);
117  }
118  }
119 
120  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD, "after set key, usconfig:%x\n",
121  us_config);
122 }
123 
124 u8 rtl_cam_add_one_entry(struct ieee80211_hw *hw, u8 *mac_addr,
125  u32 ul_key_id, u32 ul_entry_idx, u32 ul_enc_alg,
126  u32 ul_default_key, u8 *key_content)
127 {
128  u32 us_config;
129  struct rtl_priv *rtlpriv = rtl_priv(hw);
130 
131  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
132  "EntryNo:%x, ulKeyId=%x, ulEncAlg=%x, ulUseDK=%x MacAddr %pM\n",
133  ul_entry_idx, ul_key_id, ul_enc_alg,
134  ul_default_key, mac_addr);
135 
136  if (ul_key_id == TOTAL_CAM_ENTRY) {
137  RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
138  "<=== ulKeyId exceed!\n");
139  return 0;
140  }
141 
142  if (ul_default_key == 1) {
143  us_config = CFG_VALID | ((u16) (ul_enc_alg) << 2);
144  } else {
145  us_config = CFG_VALID | ((ul_enc_alg) << 2) | ul_key_id;
146  }
147 
148  rtl_cam_program_entry(hw, ul_entry_idx, mac_addr,
149  key_content, us_config);
150 
151  RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "<===\n");
152 
153  return 1;
154 
155 }
156 EXPORT_SYMBOL(rtl_cam_add_one_entry);
157 
158 int rtl_cam_delete_one_entry(struct ieee80211_hw *hw,
159  u8 *mac_addr, u32 ul_key_id)
160 {
161  u32 ul_command;
162  struct rtl_priv *rtlpriv = rtl_priv(hw);
163 
164  RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG, "key_idx:%d\n", ul_key_id);
165 
166  ul_command = ul_key_id * CAM_CONTENT_COUNT;
167  ul_command = ul_command | BIT(31) | BIT(16);
168 
169  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], 0);
170  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
171 
172  RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
173  "rtl_cam_delete_one_entry(): WRITE A4: %x\n", 0);
174  RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
175  "rtl_cam_delete_one_entry(): WRITE A0: %x\n", ul_command);
176 
177  return 0;
178 
179 }
180 EXPORT_SYMBOL(rtl_cam_delete_one_entry);
181 
182 void rtl_cam_reset_all_entry(struct ieee80211_hw *hw)
183 {
184  u32 ul_command;
185  struct rtl_priv *rtlpriv = rtl_priv(hw);
186 
187  ul_command = BIT(31) | BIT(30);
188  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
189 }
190 EXPORT_SYMBOL(rtl_cam_reset_all_entry);
191 
192 void rtl_cam_mark_invalid(struct ieee80211_hw *hw, u8 uc_index)
193 {
194  struct rtl_priv *rtlpriv = rtl_priv(hw);
195 
196  u32 ul_command;
197  u32 ul_content;
198  u32 ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
199 
200  switch (rtlpriv->sec.pairwise_enc_algorithm) {
201  case WEP40_ENCRYPTION:
202  ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
203  break;
204  case WEP104_ENCRYPTION:
205  ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
206  break;
207  case TKIP_ENCRYPTION:
208  ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
209  break;
210  case AESCCMP_ENCRYPTION:
211  ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
212  break;
213  default:
214  ul_enc_algo = rtlpriv->cfg->maps[SEC_CAM_AES];
215  }
216 
217  ul_content = (uc_index & 3) | ((u16) (ul_enc_algo) << 2);
218 
219  ul_content |= BIT(15);
220  ul_command = CAM_CONTENT_COUNT * uc_index;
221  ul_command = ul_command | BIT(31) | BIT(16);
222 
223  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
224  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
225 
226  RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
227  "rtl_cam_mark_invalid(): WRITE A4: %x\n", ul_content);
228  RT_TRACE(rtlpriv, COMP_SEC, DBG_DMESG,
229  "rtl_cam_mark_invalid(): WRITE A0: %x\n", ul_command);
230 }
231 EXPORT_SYMBOL(rtl_cam_mark_invalid);
232 
233 void rtl_cam_empty_entry(struct ieee80211_hw *hw, u8 uc_index)
234 {
235  struct rtl_priv *rtlpriv = rtl_priv(hw);
236 
237  u32 ul_command;
238  u32 ul_content;
239  u32 ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
240  u8 entry_i;
241 
242  switch (rtlpriv->sec.pairwise_enc_algorithm) {
243  case WEP40_ENCRYPTION:
244  ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP40];
245  break;
246  case WEP104_ENCRYPTION:
247  ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_WEP104];
248  break;
249  case TKIP_ENCRYPTION:
250  ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_TKIP];
251  break;
252  case AESCCMP_ENCRYPTION:
253  ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
254  break;
255  default:
256  ul_encalgo = rtlpriv->cfg->maps[SEC_CAM_AES];
257  }
258 
259  for (entry_i = 0; entry_i < CAM_CONTENT_COUNT; entry_i++) {
260 
261  if (entry_i == 0) {
262  ul_content =
263  (uc_index & 0x03) | ((u16) (ul_encalgo) << 2);
264  ul_content |= BIT(15);
265 
266  } else {
267  ul_content = 0;
268  }
269 
270  ul_command = CAM_CONTENT_COUNT * uc_index + entry_i;
271  ul_command = ul_command | BIT(31) | BIT(16);
272 
273  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[WCAMI], ul_content);
274  rtl_write_dword(rtlpriv, rtlpriv->cfg->maps[RWCAM], ul_command);
275 
276  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
277  "rtl_cam_empty_entry(): WRITE A4: %x\n",
278  ul_content);
279  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
280  "rtl_cam_empty_entry(): WRITE A0: %x\n",
281  ul_command);
282  }
283 
284 }
285 EXPORT_SYMBOL(rtl_cam_empty_entry);
286 
287 u8 rtl_cam_get_free_entry(struct ieee80211_hw *hw, u8 *sta_addr)
288 {
289  struct rtl_priv *rtlpriv = rtl_priv(hw);
290  u32 bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> 4;
291  u8 entry_idx = 0;
292  u8 i, *addr;
293 
294  if (NULL == sta_addr) {
295  RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG, "sta_addr is NULL\n");
296  return TOTAL_CAM_ENTRY;
297  }
298  /* Does STA already exist? */
299  for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
300  addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
301  if (memcmp(addr, sta_addr, ETH_ALEN) == 0)
302  return i;
303  }
304  /* Get a free CAM entry. */
305  for (entry_idx = 4; entry_idx < TOTAL_CAM_ENTRY; entry_idx++) {
306  if ((bitmap & BIT(0)) == 0) {
307  RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
308  "-----hwsec_cam_bitmap: 0x%x entry_idx=%d\n",
309  rtlpriv->sec.hwsec_cam_bitmap, entry_idx);
310  rtlpriv->sec.hwsec_cam_bitmap |= BIT(0) << entry_idx;
311  memcpy(rtlpriv->sec.hwsec_cam_sta_addr[entry_idx],
312  sta_addr, ETH_ALEN);
313  return entry_idx;
314  }
315  bitmap = bitmap >> 1;
316  }
317  return TOTAL_CAM_ENTRY;
318 }
319 EXPORT_SYMBOL(rtl_cam_get_free_entry);
320 
321 void rtl_cam_del_entry(struct ieee80211_hw *hw, u8 *sta_addr)
322 {
323  struct rtl_priv *rtlpriv = rtl_priv(hw);
324  u32 bitmap;
325  u8 i, *addr;
326 
327  if (NULL == sta_addr) {
328  RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG, "sta_addr is NULL\n");
329  }
330 
331  if (is_zero_ether_addr(sta_addr)) {
332  RT_TRACE(rtlpriv, COMP_SEC, DBG_EMERG,
333  "sta_addr is %pM\n", sta_addr);
334  return;
335  }
336  /* Does STA already exist? */
337  for (i = 4; i < TOTAL_CAM_ENTRY; i++) {
338  addr = rtlpriv->sec.hwsec_cam_sta_addr[i];
339  bitmap = (rtlpriv->sec.hwsec_cam_bitmap) >> i;
340  if (((bitmap & BIT(0)) == BIT(0)) &&
341  (memcmp(addr, sta_addr, ETH_ALEN) == 0)) {
342  /* Remove from HW Security CAM */
343  memset(rtlpriv->sec.hwsec_cam_sta_addr[i], 0, ETH_ALEN);
344  rtlpriv->sec.hwsec_cam_bitmap &= ~(BIT(0) << i);
345  RT_TRACE(rtlpriv, COMP_SEC, DBG_LOUD,
346  "del CAM entry %d\n", i);
347  }
348  }
349  return;
350 }
351 EXPORT_SYMBOL(rtl_cam_del_entry);
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