1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2003-2005 Devicescape Software, Inc. 4 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright (C) 2015 Intel Deutschland GmbH 7 */ 8 9 #include <linux/kobject.h> 10 #include <linux/slab.h> 11 #include "ieee80211_i.h" 12 #include "key.h" 13 #include "debugfs.h" 14 #include "debugfs_key.h" 15 16 #define KEY_READ(name, prop, format_string) \ 17 static ssize_t key_##name##_read(struct file *file, \ 18 char __user *userbuf, \ 19 size_t count, loff_t *ppos) \ 20 { \ 21 struct ieee80211_key *key = file->private_data; \ 22 return mac80211_format_buffer(userbuf, count, ppos, \ 23 format_string, key->prop); \ 24 } 25 #define KEY_READ_D(name) KEY_READ(name, name, "%d\n") 26 #define KEY_READ_X(name) KEY_READ(name, name, "0x%x\n") 27 28 #define KEY_OPS(name) \ 29 static const struct file_operations key_ ##name## _ops = { \ 30 .read = key_##name##_read, \ 31 .open = simple_open, \ 32 .llseek = generic_file_llseek, \ 33 } 34 35 #define KEY_OPS_W(name) \ 36 static const struct file_operations key_ ##name## _ops = { \ 37 .read = key_##name##_read, \ 38 .write = key_##name##_write, \ 39 .open = simple_open, \ 40 .llseek = generic_file_llseek, \ 41 } 42 43 #define KEY_FILE(name, format) \ 44 KEY_READ_##format(name) \ 45 KEY_OPS(name) 46 47 #define KEY_CONF_READ(name, format_string) \ 48 KEY_READ(conf_##name, conf.name, format_string) 49 #define KEY_CONF_READ_D(name) KEY_CONF_READ(name, "%d\n") 50 51 #define KEY_CONF_OPS(name) \ 52 static const struct file_operations key_ ##name## _ops = { \ 53 .read = key_conf_##name##_read, \ 54 .open = simple_open, \ 55 .llseek = generic_file_llseek, \ 56 } 57 58 #define KEY_CONF_FILE(name, format) \ 59 KEY_CONF_READ_##format(name) \ 60 KEY_CONF_OPS(name) 61 62 KEY_CONF_FILE(keylen, D); 63 KEY_CONF_FILE(keyidx, D); 64 KEY_CONF_FILE(hw_key_idx, D); 65 KEY_FILE(flags, X); 66 KEY_READ(ifindex, sdata->name, "%s\n"); 67 KEY_OPS(ifindex); 68 69 static ssize_t key_algorithm_read(struct file *file, 70 char __user *userbuf, 71 size_t count, loff_t *ppos) 72 { 73 char buf[15]; 74 struct ieee80211_key *key = file->private_data; 75 u32 c = key->conf.cipher; 76 77 sprintf(buf, "%.2x-%.2x-%.2x:%d\n", 78 c >> 24, (c >> 16) & 0xff, (c >> 8) & 0xff, c & 0xff); 79 return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf)); 80 } 81 KEY_OPS(algorithm); 82 83 static ssize_t key_tx_spec_write(struct file *file, const char __user *userbuf, 84 size_t count, loff_t *ppos) 85 { 86 struct ieee80211_key *key = file->private_data; 87 u64 pn; 88 int ret; 89 90 switch (key->conf.cipher) { 91 case WLAN_CIPHER_SUITE_WEP40: 92 case WLAN_CIPHER_SUITE_WEP104: 93 return -EINVAL; 94 case WLAN_CIPHER_SUITE_TKIP: 95 /* not supported yet */ 96 return -EOPNOTSUPP; 97 case WLAN_CIPHER_SUITE_CCMP: 98 case WLAN_CIPHER_SUITE_CCMP_256: 99 case WLAN_CIPHER_SUITE_AES_CMAC: 100 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 101 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 102 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 103 case WLAN_CIPHER_SUITE_GCMP: 104 case WLAN_CIPHER_SUITE_GCMP_256: 105 ret = kstrtou64_from_user(userbuf, count, 16, &pn); 106 if (ret) 107 return ret; 108 /* PN is a 48-bit counter */ 109 if (pn >= (1ULL << 48)) 110 return -ERANGE; 111 atomic64_set(&key->conf.tx_pn, pn); 112 return count; 113 default: 114 return 0; 115 } 116 } 117 118 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf, 119 size_t count, loff_t *ppos) 120 { 121 u64 pn; 122 char buf[20]; 123 int len; 124 struct ieee80211_key *key = file->private_data; 125 126 switch (key->conf.cipher) { 127 case WLAN_CIPHER_SUITE_WEP40: 128 case WLAN_CIPHER_SUITE_WEP104: 129 len = scnprintf(buf, sizeof(buf), "\n"); 130 break; 131 case WLAN_CIPHER_SUITE_TKIP: 132 pn = atomic64_read(&key->conf.tx_pn); 133 len = scnprintf(buf, sizeof(buf), "%08x %04x\n", 134 TKIP_PN_TO_IV32(pn), 135 TKIP_PN_TO_IV16(pn)); 136 break; 137 case WLAN_CIPHER_SUITE_CCMP: 138 case WLAN_CIPHER_SUITE_CCMP_256: 139 case WLAN_CIPHER_SUITE_AES_CMAC: 140 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 141 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 142 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 143 case WLAN_CIPHER_SUITE_GCMP: 144 case WLAN_CIPHER_SUITE_GCMP_256: 145 pn = atomic64_read(&key->conf.tx_pn); 146 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n", 147 (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24), 148 (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn); 149 break; 150 default: 151 return 0; 152 } 153 return simple_read_from_buffer(userbuf, count, ppos, buf, len); 154 } 155 KEY_OPS_W(tx_spec); 156 157 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf, 158 size_t count, loff_t *ppos) 159 { 160 struct ieee80211_key *key = file->private_data; 161 char buf[14*IEEE80211_NUM_TIDS+1], *p = buf; 162 int i, len; 163 const u8 *rpn; 164 165 switch (key->conf.cipher) { 166 case WLAN_CIPHER_SUITE_WEP40: 167 case WLAN_CIPHER_SUITE_WEP104: 168 len = scnprintf(buf, sizeof(buf), "\n"); 169 break; 170 case WLAN_CIPHER_SUITE_TKIP: 171 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 172 p += scnprintf(p, sizeof(buf)+buf-p, 173 "%08x %04x\n", 174 key->u.tkip.rx[i].iv32, 175 key->u.tkip.rx[i].iv16); 176 len = p - buf; 177 break; 178 case WLAN_CIPHER_SUITE_CCMP: 179 case WLAN_CIPHER_SUITE_CCMP_256: 180 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) { 181 rpn = key->u.ccmp.rx_pn[i]; 182 p += scnprintf(p, sizeof(buf)+buf-p, 183 "%02x%02x%02x%02x%02x%02x\n", 184 rpn[0], rpn[1], rpn[2], 185 rpn[3], rpn[4], rpn[5]); 186 } 187 len = p - buf; 188 break; 189 case WLAN_CIPHER_SUITE_AES_CMAC: 190 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 191 rpn = key->u.aes_cmac.rx_pn; 192 p += scnprintf(p, sizeof(buf)+buf-p, 193 "%02x%02x%02x%02x%02x%02x\n", 194 rpn[0], rpn[1], rpn[2], 195 rpn[3], rpn[4], rpn[5]); 196 len = p - buf; 197 break; 198 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 199 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 200 rpn = key->u.aes_gmac.rx_pn; 201 p += scnprintf(p, sizeof(buf)+buf-p, 202 "%02x%02x%02x%02x%02x%02x\n", 203 rpn[0], rpn[1], rpn[2], 204 rpn[3], rpn[4], rpn[5]); 205 len = p - buf; 206 break; 207 case WLAN_CIPHER_SUITE_GCMP: 208 case WLAN_CIPHER_SUITE_GCMP_256: 209 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) { 210 rpn = key->u.gcmp.rx_pn[i]; 211 p += scnprintf(p, sizeof(buf)+buf-p, 212 "%02x%02x%02x%02x%02x%02x\n", 213 rpn[0], rpn[1], rpn[2], 214 rpn[3], rpn[4], rpn[5]); 215 } 216 len = p - buf; 217 break; 218 default: 219 return 0; 220 } 221 return simple_read_from_buffer(userbuf, count, ppos, buf, len); 222 } 223 KEY_OPS(rx_spec); 224 225 static ssize_t key_replays_read(struct file *file, char __user *userbuf, 226 size_t count, loff_t *ppos) 227 { 228 struct ieee80211_key *key = file->private_data; 229 char buf[20]; 230 int len; 231 232 switch (key->conf.cipher) { 233 case WLAN_CIPHER_SUITE_CCMP: 234 case WLAN_CIPHER_SUITE_CCMP_256: 235 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays); 236 break; 237 case WLAN_CIPHER_SUITE_AES_CMAC: 238 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 239 len = scnprintf(buf, sizeof(buf), "%u\n", 240 key->u.aes_cmac.replays); 241 break; 242 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 243 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 244 len = scnprintf(buf, sizeof(buf), "%u\n", 245 key->u.aes_gmac.replays); 246 break; 247 case WLAN_CIPHER_SUITE_GCMP: 248 case WLAN_CIPHER_SUITE_GCMP_256: 249 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.gcmp.replays); 250 break; 251 default: 252 return 0; 253 } 254 return simple_read_from_buffer(userbuf, count, ppos, buf, len); 255 } 256 KEY_OPS(replays); 257 258 static ssize_t key_icverrors_read(struct file *file, char __user *userbuf, 259 size_t count, loff_t *ppos) 260 { 261 struct ieee80211_key *key = file->private_data; 262 char buf[20]; 263 int len; 264 265 switch (key->conf.cipher) { 266 case WLAN_CIPHER_SUITE_AES_CMAC: 267 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 268 len = scnprintf(buf, sizeof(buf), "%u\n", 269 key->u.aes_cmac.icverrors); 270 break; 271 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 272 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 273 len = scnprintf(buf, sizeof(buf), "%u\n", 274 key->u.aes_gmac.icverrors); 275 break; 276 default: 277 return 0; 278 } 279 return simple_read_from_buffer(userbuf, count, ppos, buf, len); 280 } 281 KEY_OPS(icverrors); 282 283 static ssize_t key_mic_failures_read(struct file *file, char __user *userbuf, 284 size_t count, loff_t *ppos) 285 { 286 struct ieee80211_key *key = file->private_data; 287 char buf[20]; 288 int len; 289 290 if (key->conf.cipher != WLAN_CIPHER_SUITE_TKIP) 291 return -EINVAL; 292 293 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.tkip.mic_failures); 294 295 return simple_read_from_buffer(userbuf, count, ppos, buf, len); 296 } 297 KEY_OPS(mic_failures); 298 299 static ssize_t key_key_read(struct file *file, char __user *userbuf, 300 size_t count, loff_t *ppos) 301 { 302 struct ieee80211_key *key = file->private_data; 303 int i, bufsize = 2 * key->conf.keylen + 2; 304 char *buf = kmalloc(bufsize, GFP_KERNEL); 305 char *p = buf; 306 ssize_t res; 307 308 if (!buf) 309 return -ENOMEM; 310 311 for (i = 0; i < key->conf.keylen; i++) 312 p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]); 313 p += scnprintf(p, bufsize+buf-p, "\n"); 314 res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf); 315 kfree(buf); 316 return res; 317 } 318 KEY_OPS(key); 319 320 #define DEBUGFS_ADD(name) \ 321 debugfs_create_file(#name, 0400, key->debugfs.dir, \ 322 key, &key_##name##_ops); 323 #define DEBUGFS_ADD_W(name) \ 324 debugfs_create_file(#name, 0600, key->debugfs.dir, \ 325 key, &key_##name##_ops); 326 327 void ieee80211_debugfs_key_add(struct ieee80211_key *key) 328 { 329 static int keycount; 330 char buf[100]; 331 struct sta_info *sta; 332 333 if (!key->local->debugfs.keys) 334 return; 335 336 sprintf(buf, "%d", keycount); 337 key->debugfs.cnt = keycount; 338 keycount++; 339 key->debugfs.dir = debugfs_create_dir(buf, 340 key->local->debugfs.keys); 341 342 sta = key->sta; 343 if (sta) { 344 sprintf(buf, "../../netdev:%s/stations/%pM", 345 sta->sdata->name, sta->sta.addr); 346 key->debugfs.stalink = 347 debugfs_create_symlink("station", key->debugfs.dir, buf); 348 } 349 350 DEBUGFS_ADD(keylen); 351 DEBUGFS_ADD(flags); 352 DEBUGFS_ADD(keyidx); 353 DEBUGFS_ADD(hw_key_idx); 354 DEBUGFS_ADD(algorithm); 355 DEBUGFS_ADD_W(tx_spec); 356 DEBUGFS_ADD(rx_spec); 357 DEBUGFS_ADD(replays); 358 DEBUGFS_ADD(icverrors); 359 DEBUGFS_ADD(mic_failures); 360 DEBUGFS_ADD(key); 361 DEBUGFS_ADD(ifindex); 362 }; 363 364 void ieee80211_debugfs_key_remove(struct ieee80211_key *key) 365 { 366 if (!key) 367 return; 368 369 debugfs_remove_recursive(key->debugfs.dir); 370 key->debugfs.dir = NULL; 371 } 372 373 void ieee80211_debugfs_key_update_default(struct ieee80211_sub_if_data *sdata) 374 { 375 char buf[50]; 376 struct ieee80211_key *key; 377 378 if (!sdata->vif.debugfs_dir) 379 return; 380 381 lockdep_assert_held(&sdata->local->key_mtx); 382 383 debugfs_remove(sdata->debugfs.default_unicast_key); 384 sdata->debugfs.default_unicast_key = NULL; 385 386 if (sdata->default_unicast_key) { 387 key = key_mtx_dereference(sdata->local, 388 sdata->default_unicast_key); 389 sprintf(buf, "../keys/%d", key->debugfs.cnt); 390 sdata->debugfs.default_unicast_key = 391 debugfs_create_symlink("default_unicast_key", 392 sdata->vif.debugfs_dir, buf); 393 } 394 395 debugfs_remove(sdata->debugfs.default_multicast_key); 396 sdata->debugfs.default_multicast_key = NULL; 397 398 if (sdata->default_multicast_key) { 399 key = key_mtx_dereference(sdata->local, 400 sdata->default_multicast_key); 401 sprintf(buf, "../keys/%d", key->debugfs.cnt); 402 sdata->debugfs.default_multicast_key = 403 debugfs_create_symlink("default_multicast_key", 404 sdata->vif.debugfs_dir, buf); 405 } 406 } 407 408 void ieee80211_debugfs_key_add_mgmt_default(struct ieee80211_sub_if_data *sdata) 409 { 410 char buf[50]; 411 struct ieee80211_key *key; 412 413 if (!sdata->vif.debugfs_dir) 414 return; 415 416 key = key_mtx_dereference(sdata->local, 417 sdata->default_mgmt_key); 418 if (key) { 419 sprintf(buf, "../keys/%d", key->debugfs.cnt); 420 sdata->debugfs.default_mgmt_key = 421 debugfs_create_symlink("default_mgmt_key", 422 sdata->vif.debugfs_dir, buf); 423 } else 424 ieee80211_debugfs_key_remove_mgmt_default(sdata); 425 } 426 427 void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sdata) 428 { 429 if (!sdata) 430 return; 431 432 debugfs_remove(sdata->debugfs.default_mgmt_key); 433 sdata->debugfs.default_mgmt_key = NULL; 434 } 435 436 void 437 ieee80211_debugfs_key_add_beacon_default(struct ieee80211_sub_if_data *sdata) 438 { 439 char buf[50]; 440 struct ieee80211_key *key; 441 442 if (!sdata->vif.debugfs_dir) 443 return; 444 445 key = key_mtx_dereference(sdata->local, 446 sdata->default_beacon_key); 447 if (key) { 448 sprintf(buf, "../keys/%d", key->debugfs.cnt); 449 sdata->debugfs.default_beacon_key = 450 debugfs_create_symlink("default_beacon_key", 451 sdata->vif.debugfs_dir, buf); 452 } else { 453 ieee80211_debugfs_key_remove_beacon_default(sdata); 454 } 455 } 456 457 void 458 ieee80211_debugfs_key_remove_beacon_default(struct ieee80211_sub_if_data *sdata) 459 { 460 if (!sdata) 461 return; 462 463 debugfs_remove(sdata->debugfs.default_beacon_key); 464 sdata->debugfs.default_beacon_key = NULL; 465 } 466 467 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key, 468 struct sta_info *sta) 469 { 470 debugfs_remove(key->debugfs.stalink); 471 key->debugfs.stalink = NULL; 472 } 473