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esp-idf/components/esp_hw_support/mac_addr.c

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7.7 KiB
C
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/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#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 */
#if CONFIG_ESP32_UNIVERSAL_MAC_ADDRESSES_FOUR || \
CONFIG_ESP32S3_UNIVERSAL_MAC_ADDRESSES_FOUR || \
CONFIG_ESP32C3_UNIVERSAL_MAC_ADDRESSES_FOUR
#define MAC_ADDR_UNIVERSE_BT_OFFSET 2
#else
#define MAC_ADDR_UNIVERSE_BT_OFFSET 1
#endif
#if CONFIG_IEEE802154_ENABLED
#define ESP_MAC_ADDRESS_LEN 8
#else
#define ESP_MAC_ADDRESS_LEN 6
#endif
static const char *TAG = "system_api";
static uint8_t base_mac_addr[ESP_MAC_ADDRESS_LEN] = { 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, ESP_MAC_ADDRESS_LEN);
return ESP_OK;
}
esp_err_t esp_base_mac_addr_get(uint8_t *mac)
{
if (mac == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (base_mac_addr[0] == 0 && memcmp(base_mac_addr, &base_mac_addr[1], ESP_MAC_ADDRESS_LEN - 1) == 0) {
ESP_LOGI(TAG, "Base MAC address is not set");
return ESP_ERR_INVALID_MAC;
}
memcpy(mac, base_mac_addr, ESP_MAC_ADDRESS_LEN);
return ESP_OK;
}
esp_err_t esp_efuse_mac_get_custom(uint8_t *mac)
{
#if !CONFIG_IDF_TARGET_ESP32
size_t size_bits = esp_efuse_get_field_size(ESP_EFUSE_USER_DATA_MAC_CUSTOM);
assert((size_bits % 8) == 0);
esp_err_t err = esp_efuse_read_field_blob(ESP_EFUSE_USER_DATA_MAC_CUSTOM, mac, size_bits);
if (err != ESP_OK) {
return err;
}
size_t size = size_bits / 8;
if (mac[0] == 0 && memcmp(mac, &mac[1], size - 1) == 0) {
ESP_LOGE(TAG, "eFuse MAC_CUSTOM is empty");
return ESP_ERR_INVALID_MAC;
}
#if (ESP_MAC_ADDRESS_LEN == 8)
err = esp_efuse_read_field_blob(ESP_EFUSE_MAC_EXT, &mac[6], ESP_MAC_ADDRESS_LEN * 8 - size_bits);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Reading MAC_EXT failed, error=%d", err);
return err;
}
#endif
return ESP_OK;
#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)
{
size_t size_bits = esp_efuse_get_field_size(ESP_EFUSE_MAC_FACTORY);
assert((size_bits % 8) == 0);
esp_err_t err = esp_efuse_read_field_blob(ESP_EFUSE_MAC_FACTORY, mac, size_bits);
if (err != ESP_OK) {
return err;
}
#if (ESP_MAC_ADDRESS_LEN == 8)
err = esp_efuse_read_field_blob(ESP_EFUSE_MAC_EXT, &mac[6], ESP_MAC_ADDRESS_LEN * 8 - size_bits);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Reading MAC_EXT failed, error=%d", err);
return err;
}
#endif
#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)
{
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);
const unsigned UL_BIT = 0x2;
local_mac[0] |= UL_BIT;
if (local_mac[0] == universal_mac[0]) {
// universal_mac was already local, so flip this bit instead
// (this is kept to be compatible with the previous behaviour of this function)
local_mac[0] ^= 0x4;
}
return ESP_OK;
}
esp_err_t esp_read_mac(uint8_t *mac, esp_mac_type_t type)
{
uint8_t efuse_mac[ESP_MAC_ADDRESS_LEN];
if (mac == NULL) {
ESP_LOGE(TAG, "mac address param is NULL");
return ESP_ERR_INVALID_ARG;
}
#if CONFIG_IEEE802154_ENABLED
if (type < ESP_MAC_WIFI_STA || type > ESP_MAC_IEEE802154) {
#else
if (type < ESP_MAC_WIFI_STA || type > ESP_MAC_ETH) {
#endif
ESP_LOGE(TAG, "mac type is incorrect");
return ESP_ERR_INVALID_ARG;
}
// 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) {
ESP_LOGI(TAG, "read default base MAC address from EFUSE");
esp_efuse_mac_get_default(efuse_mac);
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:
#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
mac[5] += 1;
#endif // IDF_TARGET_ESP32S2
#else
esp_derive_local_mac(mac, efuse_mac);
#endif // CONFIG_ESP_MAC_ADDR_UNIVERSE_WIFI_AP
break;
case ESP_MAC_BT:
#if CONFIG_ESP_MAC_ADDR_UNIVERSE_BT
memcpy(mac, efuse_mac, 6);
#if !CONFIG_IDF_TARGET_ESP32H2
// esp32h2 chips do not have wifi module, so the mac address do not need to add the BT offset
mac[5] += MAC_ADDR_UNIVERSE_BT_OFFSET;
#endif //!CONFIG_IDF_TARGET_ESP32H2
#else
return ESP_ERR_NOT_SUPPORTED;
#endif // CONFIG_ESP_MAC_ADDR_UNIVERSE_BT
break;
case ESP_MAC_ETH:
#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 // CONFIG_ESP_MAC_ADDR_UNIVERSE_ETH
break;
#if CONFIG_IEEE802154_ENABLED
case ESP_MAC_IEEE802154:
memcpy(mac, efuse_mac, 8);
break;
#endif
default:
ESP_LOGE(TAG, "unsupported mac type");
break;
}
return ESP_OK;
}
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