Specifies where a given MAC/hardware address was

obtained. More...

Variables
static const uint32_t	isc::dhcp::HWAddr::HWADDR_SOURCE_ANY = 0xffffffff
	Not really a type, only used in getMAC() calls.
static const uint32_t	isc::dhcp::HWAddr::HWADDR_SOURCE_CLIENT_ADDR_RELAY_OPTION = 0x00000008
	Get it from RFC6939 option.
static const uint32_t	isc::dhcp::HWAddr::HWADDR_SOURCE_DOCSIS_CMTS = 0x00000040
	A CMTS (acting as DHCP relay agent) that supports DOCSIS standard can insert DOCSIS options that contain client's MAC address.
static const uint32_t	isc::dhcp::HWAddr::HWADDR_SOURCE_DOCSIS_MODEM = 0x00000080
	A cable modem (acting as DHCP client) that supports DOCSIS standard can insert DOCSIS options that contain client's MAC address.
static const uint32_t	isc::dhcp::HWAddr::HWADDR_SOURCE_DUID = 0x00000002
	Extracted from DUID-LL or DUID-LLT (not 100% reliable as the client can send fake DUID).
static const uint32_t	isc::dhcp::HWAddr::HWADDR_SOURCE_IPV6_LINK_LOCAL = 0x00000004
	Extracted from IPv6 link-local address.
static const uint32_t	isc::dhcp::HWAddr::HWADDR_SOURCE_RAW = 0x00000001
	Obtained first hand from raw socket (100% reliable).
static const uint32_t	isc::dhcp::HWAddr::HWADDR_SOURCE_REMOTE_ID = 0x00000010
	A relay can insert remote-id.
static const uint32_t	isc::dhcp::HWAddr::HWADDR_SOURCE_SUBSCRIBER_ID = 0x00000020
	A relay can insert a subscriber-id option.
static const uint32_t	isc::dhcp::HWAddr::HWADDR_SOURCE_UNKNOWN = 0x00000000
	Used when actual origin is not known, e.g.

Detailed Description

obtained.

The list covers all possible MAC/hw address sources.

Variable Documentation

HWADDR_SOURCE_ANY

const uint32_t isc::dhcp::HWAddr::HWADDR_SOURCE_ANY = 0xffffffff

static

Not really a type, only used in getMAC() calls.

Definition at line 37 of file hwaddr.h.

Referenced by isc::dhcp::CfgMACSource::CfgMACSource().

HWADDR_SOURCE_CLIENT_ADDR_RELAY_OPTION

const uint32_t isc::dhcp::HWAddr::HWADDR_SOURCE_CLIENT_ADDR_RELAY_OPTION = 0x00000008

static

Get it from RFC6939 option.

(A relay agent can insert client link layer address option). Note that a skilled attacker can fake that by sending his request relayed, so the legitimate relay will think it's a second relay.

Definition at line 59 of file hwaddr.h.

Referenced by isc::dhcp::Pkt::getMAC(), and isc::dhcp::Pkt6::getMACFromIPv6RelayOpt().

HWADDR_SOURCE_DOCSIS_CMTS

const uint32_t isc::dhcp::HWAddr::HWADDR_SOURCE_DOCSIS_CMTS = 0x00000040

static

A CMTS (acting as DHCP relay agent) that supports DOCSIS standard can insert DOCSIS options that contain client's MAC address.

This specific option is suboption 1026 in vendor-class option with vendor-id=4491. Client in this context would be a cable modem.

Definition at line 73 of file hwaddr.h.

Referenced by isc::dhcp::Pkt::getMAC(), and isc::dhcp::Pkt6::getMACFromDocsisCMTS().

HWADDR_SOURCE_DOCSIS_MODEM

const uint32_t isc::dhcp::HWAddr::HWADDR_SOURCE_DOCSIS_MODEM = 0x00000080

static

A cable modem (acting as DHCP client) that supports DOCSIS standard can insert DOCSIS options that contain client's MAC address.

This specific option is suboption 36 in vendor-class option with vendor-id=4491.

Definition at line 79 of file hwaddr.h.

Referenced by isc::dhcp::Pkt::getMAC(), and isc::dhcp::Pkt6::getMACFromDocsisModem().

HWADDR_SOURCE_DUID

const uint32_t isc::dhcp::HWAddr::HWADDR_SOURCE_DUID = 0x00000002

static

Extracted from DUID-LL or DUID-LLT (not 100% reliable as the client can send fake DUID).

Definition at line 48 of file hwaddr.h.

Referenced by isc::dhcp::Pkt::getMAC(), and isc::dhcp::Pkt6::getMACFromDUID().

HWADDR_SOURCE_IPV6_LINK_LOCAL

const uint32_t isc::dhcp::HWAddr::HWADDR_SOURCE_IPV6_LINK_LOCAL = 0x00000004

static

Extracted from IPv6 link-local address.

Not 100% reliable, as the client can use different IID other than EUI-64, e.g. Windows supports RFC4941 and uses random values instead of EUI-64.

Definition at line 53 of file hwaddr.h.

Referenced by isc::dhcp::Pkt::getMAC(), and isc::dhcp::Pkt::getMACFromIPv6().

HWADDR_SOURCE_RAW

const uint32_t isc::dhcp::HWAddr::HWADDR_SOURCE_RAW = 0x00000001

static

Obtained first hand from raw socket (100% reliable).

Definition at line 44 of file hwaddr.h.

Referenced by isc::dhcp::Pkt::getMAC().

HWADDR_SOURCE_REMOTE_ID

const uint32_t isc::dhcp::HWAddr::HWADDR_SOURCE_REMOTE_ID = 0x00000010

static

A relay can insert remote-id.

In some deployments it contains a MAC address (RFC4649).

Definition at line 63 of file hwaddr.h.

Referenced by isc::dhcp::Pkt::getMAC(), and isc::dhcp::Pkt6::getMACFromRemoteIdRelayOption().

HWADDR_SOURCE_SUBSCRIBER_ID

const uint32_t isc::dhcp::HWAddr::HWADDR_SOURCE_SUBSCRIBER_ID = 0x00000020

static

A relay can insert a subscriber-id option.

In some deployments it contains a MAC address (RFC4580).

Definition at line 67 of file hwaddr.h.

HWADDR_SOURCE_UNKNOWN

const uint32_t isc::dhcp::HWAddr::HWADDR_SOURCE_UNKNOWN = 0x00000000

static

Used when actual origin is not known, e.g.

when reading from a lease database that didn't store that information.

Definition at line 41 of file hwaddr.h.