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net/eui64: add eui64_to_eui48() #15096

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Merged
maribu merged 2 commits into from
Sep 30, 2020
Merged

net/eui64: add eui64_to_eui48() #15096

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d7943a4
net/eui48: reorder code
benpicco Sep 30, 2020
307ea62
net/eui48: add eui64_to_eui48()
benpicco Sep 30, 2020
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104 changes: 64 additions & 40 deletions sys/include/net/eui48.h
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,49 @@ typedef struct {
uint8_t uint8[6]; /**< split into 6 8-bit words. */
} eui48_t;

/**
* @name EUI-48 bit flags contained in the first octet
*
* @see IEEE 802-2001 section 9.2
* @{
*/

/**
* @brief Locally administered address.
*/
#define EUI48_LOCAL_FLAG 0x02

/**
* @brief Group type address.
*/
#define EUI48_GROUP_FLAG 0x01
/** @} */

/**
* @brief Set the locally administrated bit in the EUI-48 address.
*
* @see IEEE 802-2001 section 9.2
*
* @param addr ethernet address
*/
static inline void eui48_set_local(eui48_t *addr)
{
addr->uint8[0] |= EUI48_LOCAL_FLAG;
}

/**
* @brief Clear the group address bit to signal the address as individual
* address
*
* @see IEEE 802-2001 section 9.2
*
* @param addr ethernet address
*/
static inline void eui48_clear_group(eui48_t *addr)
{
addr->uint8[0] &= ~EUI48_GROUP_FLAG;
}

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/**
* @brief Generates an EUI-64 from a 48-bit device address
*
Expand All @@ -57,22 +100,29 @@ static inline void eui48_to_eui64(eui64_t *eui64, const eui48_t *addr)
}

/**
* @name EUI-48 bit flags contained in the first octet
* @brief Generates an EUI-48 from a 64-bit device address
*
* @see IEEE 802-2001 section 9.2
* @{
*/

/**
* @brief Locally administered address.
*/
#define EUI48_LOCAL_FLAG 0x02

/**
* @brief Group type address.
* @warning The resulting EUI-48 is not guaranteed to be unique
* and, hence, marked as only locally unique.
*
* @param[out] eui48 the resulting EUI-48.
* @param[in] addr a 64-bit device address
*/
#define EUI48_GROUP_FLAG 0x01
/** @} */
static inline void eui64_to_eui48(eui48_t *eui48, const eui64_t *addr)
{
/* Preserve vendor id */
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eui48->uint8[0] = addr->uint8[0];
eui48->uint8[1] = addr->uint8[1];
eui48->uint8[2] = addr->uint8[2];

/* Use most volatile bits */
eui48->uint8[3] = addr->uint8[5];
eui48->uint8[4] = addr->uint8[6];
eui48->uint8[5] = addr->uint8[7];
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/* EUI is only locally unique */
eui48_set_local(eui48);
}

/**
* @brief Generates an IPv6 interface identifier from a 48-bit device address
Expand Down Expand Up @@ -106,32 +156,6 @@ static inline void eui48_from_ipv6_iid(eui48_t *addr, const eui64_t *iid)
addr->uint8[5] = iid->uint8[7];
}

/**
* @brief Set the locally administrated bit in the EUI-48 address.
*
* @see IEEE 802-2001 section 9.2
*
* @param addr ethernet address
*/
static inline void eui48_set_local(eui48_t *addr)
{
addr->uint8[0] |= EUI48_LOCAL_FLAG;
}

/**
* @brief Clear the group address bit to signal the address as individual
* address
*
* @see IEEE 802-2001 section 9.2
*
* @param addr ethernet address
*/
static inline void eui48_clear_group(eui48_t *addr)
{
addr->uint8[0] &= ~EUI48_GROUP_FLAG;
}


#ifdef __cplusplus
}
#endif
Expand Down