esp-idf/components/esp_hw_support/mac_addr.c

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// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include "sdkconfig.h"
#include "esp_rom_efuse.h"
#include "esp_system.h"
#include "esp_efuse.h"
#include "esp_efuse_table.h"
/* esp_system.h APIs relating to MAC addresses */
static const char* TAG = "system_api";
static uint8_t base_mac_addr[6] = { 0 };
esp_err_t esp_base_mac_addr_set(const uint8_t *mac)
{
if (mac == NULL) {
ESP_LOGE(TAG, "Base MAC address is NULL");
return ESP_ERR_INVALID_ARG;
}
if (mac[0] & 0x01) {
ESP_LOGE(TAG, "Base MAC must be a unicast MAC");
return ESP_ERR_INVALID_ARG;
}
memcpy(base_mac_addr, mac, 6);
return ESP_OK;
}
esp_err_t esp_base_mac_addr_get(uint8_t *mac)
{
uint8_t null_mac[6] = {0};
if (memcmp(base_mac_addr, null_mac, 6) == 0) {
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ESP_LOGI(TAG, "Base MAC address is not set");
return ESP_ERR_INVALID_MAC;
}
memcpy(mac, base_mac_addr, 6);
return ESP_OK;
}
esp_err_t esp_efuse_mac_get_custom(uint8_t *mac)
{
#if !CONFIG_IDF_TARGET_ESP32
return ESP_ERR_NOT_SUPPORTED; // TODO IDF-1326
#else
uint8_t version;
esp_efuse_read_field_blob(ESP_EFUSE_MAC_CUSTOM_VER, &version, 8);
if (version != 1) {
ESP_LOGE(TAG, "Base MAC address from BLK3 of EFUSE version error, version = %d", version);
return ESP_ERR_INVALID_VERSION;
}
uint8_t efuse_crc;
esp_efuse_read_field_blob(ESP_EFUSE_MAC_CUSTOM, mac, 48);
esp_efuse_read_field_blob(ESP_EFUSE_MAC_CUSTOM_CRC, &efuse_crc, 8);
uint8_t calc_crc = esp_rom_efuse_mac_address_crc8(mac, 6);
if (efuse_crc != calc_crc) {
ESP_LOGE(TAG, "Base MAC address from BLK3 of EFUSE CRC error, efuse_crc = 0x%02x; calc_crc = 0x%02x", efuse_crc, calc_crc);
return ESP_ERR_INVALID_CRC;
}
return ESP_OK;
#endif
}
esp_err_t esp_efuse_mac_get_default(uint8_t* mac)
{
esp_err_t err = esp_efuse_read_field_blob(ESP_EFUSE_MAC_FACTORY, mac, 48);
if (err != ESP_OK) {
return err;
}
#ifdef CONFIG_IDF_TARGET_ESP32
// Only ESP32 has MAC CRC in efuse
uint8_t efuse_crc;
esp_efuse_read_field_blob(ESP_EFUSE_MAC_FACTORY_CRC, &efuse_crc, 8);
uint8_t calc_crc = esp_rom_efuse_mac_address_crc8(mac, 6);
if (efuse_crc != calc_crc) {
// Small range of MAC addresses are accepted even if CRC is invalid.
// These addresses are reserved for Espressif internal use.
uint32_t mac_high = ((uint32_t)mac[0] << 8) | mac[1];
uint32_t mac_low = ((uint32_t)mac[2] << 24) | ((uint32_t)mac[3] << 16) | ((uint32_t)mac[4] << 8) | mac[5];
if (((mac_high & 0xFFFF) == 0x18fe) && (mac_low >= 0x346a85c7) && (mac_low <= 0x346a85f8)) {
return ESP_OK;
} else {
ESP_LOGE(TAG, "Base MAC address from BLK0 of EFUSE CRC error, efuse_crc = 0x%02x; calc_crc = 0x%02x", efuse_crc, calc_crc);
abort();
}
}
#endif // CONFIG_IDF_TARGET_ESP32
return ESP_OK;
}
esp_err_t esp_derive_local_mac(uint8_t* local_mac, const uint8_t* universal_mac)
{
uint8_t idx;
if (local_mac == NULL || universal_mac == NULL) {
ESP_LOGE(TAG, "mac address param is NULL");
return ESP_ERR_INVALID_ARG;
}
memcpy(local_mac, universal_mac, 6);
for (idx = 0; idx < 64; idx++) {
local_mac[0] = universal_mac[0] | 0x02;
local_mac[0] ^= idx << 2;
if (memcmp(local_mac, universal_mac, 6)) {
break;
}
}
return ESP_OK;
}
esp_err_t esp_read_mac(uint8_t* mac, esp_mac_type_t type)
{
uint8_t efuse_mac[6];
if (mac == NULL) {
ESP_LOGE(TAG, "mac address param is NULL");
return ESP_ERR_INVALID_ARG;
}
if (type < ESP_MAC_WIFI_STA || type > ESP_MAC_ETH) {
ESP_LOGE(TAG, "mac type is incorrect");
return ESP_ERR_INVALID_ARG;
}
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// if base mac address is not set, read one from EFUSE and then write back
if (esp_base_mac_addr_get(efuse_mac) != ESP_OK) {
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ESP_LOGI(TAG, "read default base MAC address from EFUSE");
esp_efuse_mac_get_default(efuse_mac);
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esp_base_mac_addr_set(efuse_mac);
}
switch (type) {
case ESP_MAC_WIFI_STA:
memcpy(mac, efuse_mac, 6);
break;
case ESP_MAC_WIFI_SOFTAP:
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#if CONFIG_ESP_MAC_ADDR_UNIVERSE_WIFI_AP
memcpy(mac, efuse_mac, 6);
// as a result of some esp32s2 chips burned with one MAC address by mistake,
// there are some MAC address are reserved for this bug fix.
// related mistake MAC address is 0x7cdfa1003000~0x7cdfa1005fff,
// reserved MAC address is 0x7cdfa1020000~0x7cdfa1022fff (MAC address + 0x1d000).
#ifdef CONFIG_IDF_TARGET_ESP32S2
uint8_t mac_begin[6] = { 0x7c, 0xdf, 0xa1, 0x00, 0x30, 0x00 };
uint8_t mac_end[6] = { 0x7c, 0xdf, 0xa1, 0x00, 0x5f, 0xff };
if(memcmp(mac,mac_begin,6) >= 0 && memcmp(mac_end,mac,6) >=0 ){
mac[3] += 0x02; // contain carry bit
mac[4] += 0xd0;
} else {
mac[5] += 1;
}
#else
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mac[5] += 1;
#endif // IDF_TARGET_ESP32S2
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#else
esp_derive_local_mac(mac, efuse_mac);
#endif
break;
case ESP_MAC_BT:
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#if CONFIG_ESP_MAC_ADDR_UNIVERSE_BT
memcpy(mac, efuse_mac, 6);
mac[5] += CONFIG_ESP_MAC_ADDR_UNIVERSE_BT_OFFSET;
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#endif
break;
case ESP_MAC_ETH:
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#if CONFIG_ESP_MAC_ADDR_UNIVERSE_ETH
memcpy(mac, efuse_mac, 6);
mac[5] += 3;
#else
efuse_mac[5] += 1;
esp_derive_local_mac(mac, efuse_mac);
#endif
break;
default:
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ESP_LOGE(TAG, "unsupported mac type");
break;
}
return ESP_OK;
}