1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Atheros CARL9170 driver 4 * 5 * firmware parser 6 * 7 * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/firmware.h> 12 #include <linux/crc32.h> 13 #include <linux/module.h> 14 #include "carl9170.h" 15 #include "fwcmd.h" 16 #include "version.h" 17 18 static const u8 otus_magic[4] = { OTUS_MAGIC }; 19 20 static const void *carl9170_fw_find_desc(struct ar9170 *ar, const u8 descid[4], 21 const unsigned int len, const u8 compatible_revision) 22 { 23 const struct carl9170fw_desc_head *iter; 24 25 carl9170fw_for_each_hdr(iter, ar->fw.desc) { 26 if (carl9170fw_desc_cmp(iter, descid, len, 27 compatible_revision)) 28 return (void *)iter; 29 } 30 31 /* needed to find the LAST desc */ 32 if (carl9170fw_desc_cmp(iter, descid, len, 33 compatible_revision)) 34 return (void *)iter; 35 36 return NULL; 37 } 38 39 static int carl9170_fw_verify_descs(struct ar9170 *ar, 40 const struct carl9170fw_desc_head *head, unsigned int max_len) 41 { 42 const struct carl9170fw_desc_head *pos; 43 unsigned long pos_addr, end_addr; 44 unsigned int pos_length; 45 46 if (max_len < sizeof(*pos)) 47 return -ENODATA; 48 49 max_len = min_t(unsigned int, CARL9170FW_DESC_MAX_LENGTH, max_len); 50 51 pos = head; 52 pos_addr = (unsigned long) pos; 53 end_addr = pos_addr + max_len; 54 55 while (pos_addr < end_addr) { 56 if (pos_addr + sizeof(*head) > end_addr) 57 return -E2BIG; 58 59 pos_length = le16_to_cpu(pos->length); 60 61 if (pos_length < sizeof(*head)) 62 return -EBADMSG; 63 64 if (pos_length > max_len) 65 return -EOVERFLOW; 66 67 if (pos_addr + pos_length > end_addr) 68 return -EMSGSIZE; 69 70 if (carl9170fw_desc_cmp(pos, LAST_MAGIC, 71 CARL9170FW_LAST_DESC_SIZE, 72 CARL9170FW_LAST_DESC_CUR_VER)) 73 return 0; 74 75 pos_addr += pos_length; 76 pos = (void *)pos_addr; 77 max_len -= pos_length; 78 } 79 return -EINVAL; 80 } 81 82 static void carl9170_fw_info(struct ar9170 *ar) 83 { 84 const struct carl9170fw_motd_desc *motd_desc; 85 unsigned int str_ver_len; 86 u32 fw_date; 87 88 dev_info(&ar->udev->dev, "driver API: %s 2%03d-%02d-%02d [%d-%d]\n", 89 CARL9170FW_VERSION_GIT, CARL9170FW_VERSION_YEAR, 90 CARL9170FW_VERSION_MONTH, CARL9170FW_VERSION_DAY, 91 CARL9170FW_API_MIN_VER, CARL9170FW_API_MAX_VER); 92 93 motd_desc = carl9170_fw_find_desc(ar, MOTD_MAGIC, 94 sizeof(*motd_desc), CARL9170FW_MOTD_DESC_CUR_VER); 95 96 if (motd_desc) { 97 str_ver_len = strnlen(motd_desc->release, 98 CARL9170FW_MOTD_RELEASE_LEN); 99 100 fw_date = le32_to_cpu(motd_desc->fw_year_month_day); 101 102 dev_info(&ar->udev->dev, "firmware API: %.*s 2%03d-%02d-%02d\n", 103 str_ver_len, motd_desc->release, 104 CARL9170FW_GET_YEAR(fw_date), 105 CARL9170FW_GET_MONTH(fw_date), 106 CARL9170FW_GET_DAY(fw_date)); 107 108 strscpy(ar->hw->wiphy->fw_version, motd_desc->release, 109 sizeof(ar->hw->wiphy->fw_version)); 110 } 111 } 112 113 static bool valid_dma_addr(const u32 address) 114 { 115 if (address >= AR9170_SRAM_OFFSET && 116 address < (AR9170_SRAM_OFFSET + AR9170_SRAM_SIZE)) 117 return true; 118 119 return false; 120 } 121 122 static bool valid_cpu_addr(const u32 address) 123 { 124 if (valid_dma_addr(address) || (address >= AR9170_PRAM_OFFSET && 125 address < (AR9170_PRAM_OFFSET + AR9170_PRAM_SIZE))) 126 return true; 127 128 return false; 129 } 130 131 static int carl9170_fw_checksum(struct ar9170 *ar, const __u8 *data, 132 size_t len) 133 { 134 const struct carl9170fw_otus_desc *otus_desc; 135 const struct carl9170fw_last_desc *last_desc; 136 const struct carl9170fw_chk_desc *chk_desc; 137 unsigned long fin, diff; 138 unsigned int dsc_len; 139 u32 crc32; 140 141 last_desc = carl9170_fw_find_desc(ar, LAST_MAGIC, 142 sizeof(*last_desc), CARL9170FW_LAST_DESC_CUR_VER); 143 if (!last_desc) 144 return -EINVAL; 145 146 otus_desc = carl9170_fw_find_desc(ar, OTUS_MAGIC, 147 sizeof(*otus_desc), CARL9170FW_OTUS_DESC_CUR_VER); 148 if (!otus_desc) { 149 dev_err(&ar->udev->dev, "failed to find compatible firmware " 150 "descriptor.\n"); 151 return -ENODATA; 152 } 153 154 chk_desc = carl9170_fw_find_desc(ar, CHK_MAGIC, 155 sizeof(*chk_desc), CARL9170FW_CHK_DESC_CUR_VER); 156 157 if (!chk_desc) { 158 dev_warn(&ar->udev->dev, "Unprotected firmware image.\n"); 159 return 0; 160 } 161 162 dsc_len = min_t(unsigned int, len, 163 (unsigned long)chk_desc - (unsigned long)otus_desc); 164 165 fin = (unsigned long) last_desc + sizeof(*last_desc); 166 diff = fin - (unsigned long) otus_desc; 167 168 if (diff < len) 169 len -= diff; 170 171 if (len < 256) 172 return -EIO; 173 174 crc32 = crc32_le(~0, data, len); 175 if (cpu_to_le32(crc32) != chk_desc->fw_crc32) { 176 dev_err(&ar->udev->dev, "fw checksum test failed.\n"); 177 return -ENOEXEC; 178 } 179 180 crc32 = crc32_le(crc32, (void *)otus_desc, dsc_len); 181 if (cpu_to_le32(crc32) != chk_desc->hdr_crc32) { 182 dev_err(&ar->udev->dev, "descriptor check failed.\n"); 183 return -EINVAL; 184 } 185 return 0; 186 } 187 188 static int carl9170_fw_tx_sequence(struct ar9170 *ar) 189 { 190 const struct carl9170fw_txsq_desc *txsq_desc; 191 192 txsq_desc = carl9170_fw_find_desc(ar, TXSQ_MAGIC, sizeof(*txsq_desc), 193 CARL9170FW_TXSQ_DESC_CUR_VER); 194 if (txsq_desc) { 195 ar->fw.tx_seq_table = le32_to_cpu(txsq_desc->seq_table_addr); 196 if (!valid_cpu_addr(ar->fw.tx_seq_table)) 197 return -EINVAL; 198 } else { 199 ar->fw.tx_seq_table = 0; 200 } 201 202 return 0; 203 } 204 205 static void carl9170_fw_set_if_combinations(struct ar9170 *ar, 206 u16 if_comb_types) 207 { 208 if (ar->fw.vif_num < 2) 209 return; 210 211 ar->if_comb_limits[0].max = ar->fw.vif_num; 212 ar->if_comb_limits[0].types = if_comb_types; 213 214 ar->if_combs[0].num_different_channels = 1; 215 ar->if_combs[0].max_interfaces = ar->fw.vif_num; 216 ar->if_combs[0].limits = ar->if_comb_limits; 217 ar->if_combs[0].n_limits = ARRAY_SIZE(ar->if_comb_limits); 218 219 ar->hw->wiphy->iface_combinations = ar->if_combs; 220 ar->hw->wiphy->n_iface_combinations = ARRAY_SIZE(ar->if_combs); 221 } 222 223 static int carl9170_fw(struct ar9170 *ar, const __u8 *data, size_t len) 224 { 225 const struct carl9170fw_otus_desc *otus_desc; 226 int err; 227 u16 if_comb_types; 228 229 err = carl9170_fw_checksum(ar, data, len); 230 if (err) 231 return err; 232 233 otus_desc = carl9170_fw_find_desc(ar, OTUS_MAGIC, 234 sizeof(*otus_desc), CARL9170FW_OTUS_DESC_CUR_VER); 235 if (!otus_desc) { 236 return -ENODATA; 237 } 238 239 #define SUPP(feat) \ 240 (carl9170fw_supports(otus_desc->feature_set, feat)) 241 242 if (!SUPP(CARL9170FW_DUMMY_FEATURE)) { 243 dev_err(&ar->udev->dev, "invalid firmware descriptor " 244 "format detected.\n"); 245 return -EINVAL; 246 } 247 248 ar->fw.api_version = otus_desc->api_ver; 249 250 if (ar->fw.api_version < CARL9170FW_API_MIN_VER || 251 ar->fw.api_version > CARL9170FW_API_MAX_VER) { 252 dev_err(&ar->udev->dev, "unsupported firmware api version.\n"); 253 return -EINVAL; 254 } 255 256 if (!SUPP(CARL9170FW_COMMAND_PHY) || SUPP(CARL9170FW_UNUSABLE) || 257 !SUPP(CARL9170FW_HANDLE_BACK_REQ)) { 258 dev_err(&ar->udev->dev, "firmware does support " 259 "mandatory features.\n"); 260 return -ECANCELED; 261 } 262 263 if (ilog2(le32_to_cpu(otus_desc->feature_set)) >= 264 __CARL9170FW_FEATURE_NUM) { 265 dev_warn(&ar->udev->dev, "driver does not support all " 266 "firmware features.\n"); 267 } 268 269 if (!SUPP(CARL9170FW_COMMAND_CAM)) { 270 dev_info(&ar->udev->dev, "crypto offloading is disabled " 271 "by firmware.\n"); 272 ar->fw.disable_offload_fw = true; 273 } 274 275 if (SUPP(CARL9170FW_PSM) && SUPP(CARL9170FW_FIXED_5GHZ_PSM)) 276 ieee80211_hw_set(ar->hw, SUPPORTS_PS); 277 278 if (!SUPP(CARL9170FW_USB_INIT_FIRMWARE)) { 279 dev_err(&ar->udev->dev, "firmware does not provide " 280 "mandatory interfaces.\n"); 281 return -EINVAL; 282 } 283 284 if (SUPP(CARL9170FW_MINIBOOT)) 285 ar->fw.offset = le16_to_cpu(otus_desc->miniboot_size); 286 else 287 ar->fw.offset = 0; 288 289 if (SUPP(CARL9170FW_USB_DOWN_STREAM)) { 290 ar->hw->extra_tx_headroom += sizeof(struct ar9170_stream); 291 ar->fw.tx_stream = true; 292 } 293 294 if (SUPP(CARL9170FW_USB_UP_STREAM)) 295 ar->fw.rx_stream = true; 296 297 if (SUPP(CARL9170FW_RX_FILTER)) { 298 ar->fw.rx_filter = true; 299 ar->rx_filter_caps = FIF_FCSFAIL | FIF_PLCPFAIL | 300 FIF_CONTROL | FIF_PSPOLL | FIF_OTHER_BSS; 301 } 302 303 if (SUPP(CARL9170FW_HW_COUNTERS)) 304 ar->fw.hw_counters = true; 305 306 if (SUPP(CARL9170FW_WOL)) 307 device_set_wakeup_enable(&ar->udev->dev, true); 308 309 if (SUPP(CARL9170FW_RX_BA_FILTER)) 310 ar->fw.ba_filter = true; 311 312 if_comb_types = BIT(NL80211_IFTYPE_STATION) | 313 BIT(NL80211_IFTYPE_P2P_CLIENT); 314 315 ar->fw.vif_num = otus_desc->vif_num; 316 ar->fw.cmd_bufs = otus_desc->cmd_bufs; 317 ar->fw.address = le32_to_cpu(otus_desc->fw_address); 318 ar->fw.rx_size = le16_to_cpu(otus_desc->rx_max_frame_len); 319 ar->fw.mem_blocks = min_t(unsigned int, otus_desc->tx_descs, 0xfe); 320 atomic_set(&ar->mem_free_blocks, ar->fw.mem_blocks); 321 ar->fw.mem_block_size = le16_to_cpu(otus_desc->tx_frag_len); 322 323 if (ar->fw.vif_num >= AR9170_MAX_VIRTUAL_MAC || !ar->fw.vif_num || 324 ar->fw.mem_blocks < 16 || !ar->fw.cmd_bufs || 325 ar->fw.mem_block_size < 64 || ar->fw.mem_block_size > 512 || 326 ar->fw.rx_size > 32768 || ar->fw.rx_size < 4096 || 327 !valid_cpu_addr(ar->fw.address)) { 328 dev_err(&ar->udev->dev, "firmware shows obvious signs of " 329 "malicious tampering.\n"); 330 return -EINVAL; 331 } 332 333 ar->fw.beacon_addr = le32_to_cpu(otus_desc->bcn_addr); 334 ar->fw.beacon_max_len = le16_to_cpu(otus_desc->bcn_len); 335 336 if (valid_dma_addr(ar->fw.beacon_addr) && ar->fw.beacon_max_len >= 337 AR9170_MAC_BCN_LENGTH_MAX) { 338 ar->hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_ADHOC); 339 340 if (SUPP(CARL9170FW_WLANTX_CAB)) { 341 if_comb_types |= BIT(NL80211_IFTYPE_AP); 342 343 #ifdef CONFIG_MAC80211_MESH 344 if_comb_types |= 345 BIT(NL80211_IFTYPE_MESH_POINT); 346 #endif /* CONFIG_MAC80211_MESH */ 347 } 348 } 349 350 carl9170_fw_set_if_combinations(ar, if_comb_types); 351 352 ar->hw->wiphy->interface_modes |= if_comb_types; 353 354 ar->hw->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT; 355 356 /* As IBSS Encryption is software-based, IBSS RSN is supported. */ 357 ar->hw->wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL | 358 WIPHY_FLAG_IBSS_RSN | WIPHY_FLAG_SUPPORTS_TDLS; 359 360 #undef SUPPORTED 361 return carl9170_fw_tx_sequence(ar); 362 } 363 364 static struct carl9170fw_desc_head * 365 carl9170_find_fw_desc(struct ar9170 *ar, const __u8 *fw_data, const size_t len) 366 367 { 368 int scan = 0, found = 0; 369 370 if (!carl9170fw_size_check(len)) { 371 dev_err(&ar->udev->dev, "firmware size is out of bound.\n"); 372 return NULL; 373 } 374 375 while (scan < len - sizeof(struct carl9170fw_desc_head)) { 376 if (fw_data[scan++] == otus_magic[found]) 377 found++; 378 else 379 found = 0; 380 381 if (scan >= len) 382 break; 383 384 if (found == sizeof(otus_magic)) 385 break; 386 } 387 388 if (found != sizeof(otus_magic)) 389 return NULL; 390 391 return (void *)&fw_data[scan - found]; 392 } 393 394 int carl9170_parse_firmware(struct ar9170 *ar) 395 { 396 const struct carl9170fw_desc_head *fw_desc = NULL; 397 const struct firmware *fw = ar->fw.fw; 398 unsigned long header_offset = 0; 399 int err; 400 401 if (WARN_ON(!fw)) 402 return -EINVAL; 403 404 fw_desc = carl9170_find_fw_desc(ar, fw->data, fw->size); 405 406 if (!fw_desc) { 407 dev_err(&ar->udev->dev, "unsupported firmware.\n"); 408 return -ENODATA; 409 } 410 411 header_offset = (unsigned long)fw_desc - (unsigned long)fw->data; 412 413 err = carl9170_fw_verify_descs(ar, fw_desc, fw->size - header_offset); 414 if (err) { 415 dev_err(&ar->udev->dev, "damaged firmware (%d).\n", err); 416 return err; 417 } 418 419 ar->fw.desc = fw_desc; 420 421 carl9170_fw_info(ar); 422 423 err = carl9170_fw(ar, fw->data, fw->size); 424 if (err) { 425 dev_err(&ar->udev->dev, "failed to parse firmware (%d).\n", 426 err); 427 return err; 428 } 429 430 return 0; 431 } 432