/*
 * Copyright (c) 2004-2020 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*!
 *       @header kpi_interface.h
 *       This header defines an API to interact with network interfaces in
 *       the kernel. The network interface KPI may be used to implement
 *       network interfaces or to attach protocols to existing interfaces.
 */

#ifndef __KPI_INTERFACE__
#define __KPI_INTERFACE__

#include <TargetConditionals.h>

#include <sys/kernel_types.h>


#include <sys/_types/_sa_family_t.h>

#include <Availability.h>
#define __NKE_API_DEPRECATED __API_DEPRECATED("Network Kernel Extension KPI is deprecated", macos(10.4, 10.15.4))

#if (TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
#define KPI_INTERFACE_EMBEDDED 1
#else
#define KPI_INTERFACE_EMBEDDED 0
#endif

struct timeval;
struct sockaddr;
struct sockaddr_dl;
struct kern_event_msg;
struct kev_msg;
struct ifnet_demux_desc;

/*!
 *       @enum Interface Families
 *       @abstract Constants defining interface families.
 *       @constant IFNET_FAMILY_ANY Match interface of any family type.
 *       @constant IFNET_FAMILY_LOOPBACK A software loopback interface.
 *       @constant IFNET_FAMILY_ETHERNET An Ethernet interface.
 *       @constant IFNET_FAMILY_SLIP A SLIP interface.
 *       @constant IFNET_FAMILY_TUN A tunnel interface.
 *       @constant IFNET_FAMILY_VLAN A virtual LAN interface.
 *       @constant IFNET_FAMILY_PPP A PPP interface.
 *       @constant IFNET_FAMILY_PVC A PVC interface.
 *       @constant IFNET_FAMILY_DISC A DISC interface.
 *       @constant IFNET_FAMILY_MDECAP A MDECAP interface.
 *       @constant IFNET_FAMILY_GIF A generic tunnel interface.
 *       @constant IFNET_FAMILY_FAITH A FAITH [IPv4/IPv6 translation] interface.
 *       @constant IFNET_FAMILY_STF A 6to4 interface.
 *       @constant IFNET_FAMILY_FIREWIRE An IEEE 1394 [Firewire] interface.
 *       @constant IFNET_FAMILY_BOND A virtual bonded interface.
 *       @constant IFNET_FAMILY_CELLULAR A cellular interface.
 *       @constant IFNET_FAMILY_6LOWPAN A 6LoWPAN interface.
 *       @constant IFNET_FAMILY_UTUN A utun interface.
 *       @constant IFNET_FAMILY_IPSEC An IPsec interface.
 */
enum {
	IFNET_FAMILY_ANY                = 0,
	IFNET_FAMILY_LOOPBACK           = 1,
	IFNET_FAMILY_ETHERNET           = 2,
	IFNET_FAMILY_SLIP               = 3,
	IFNET_FAMILY_TUN                = 4,
	IFNET_FAMILY_VLAN               = 5,
	IFNET_FAMILY_PPP                = 6,
	IFNET_FAMILY_PVC                = 7,
	IFNET_FAMILY_DISC               = 8,
	IFNET_FAMILY_MDECAP             = 9,
	IFNET_FAMILY_GIF                = 10,
	IFNET_FAMILY_FAITH              = 11,   /* deprecated */
	IFNET_FAMILY_STF                = 12,
	IFNET_FAMILY_FIREWIRE           = 13,
	IFNET_FAMILY_BOND               = 14,
	IFNET_FAMILY_CELLULAR           = 15,
	IFNET_FAMILY_6LOWPAN            = 16,
	IFNET_FAMILY_UTUN               = 17,
	IFNET_FAMILY_IPSEC              = 18
};

/*!
 *       @typedef ifnet_family_t
 *       @abstract Storage type for the interface family.
 */
typedef u_int32_t ifnet_family_t;


#ifndef BPF_TAP_MODE_T
#define BPF_TAP_MODE_T
/*!
 *       @enum BPF tap mode
 *       @abstract Constants defining interface families.
 *       @constant BPF_MODE_DISABLED Disable bpf.
 *       @constant BPF_MODE_INPUT Enable input only.
 *       @constant BPF_MODE_OUTPUT Enable output only.
 *       @constant BPF_MODE_INPUT_OUTPUT Enable input and output.
 */

enum {
	BPF_MODE_DISABLED               = 0,
	BPF_MODE_INPUT                  = 1,
	BPF_MODE_OUTPUT                 = 2,
	BPF_MODE_INPUT_OUTPUT           = 3
};
/*!
 *       @typedef bpf_tap_mode
 *       @abstract Mode for tapping. BPF_MODE_DISABLED/BPF_MODE_INPUT_OUTPUT etc.
 */
typedef u_int32_t bpf_tap_mode;
#endif /* !BPF_TAP_MODE_T */

/*!
 *       @typedef protocol_family_t
 *       @abstract Storage type for the protocol family.
 */
typedef u_int32_t protocol_family_t;

/*!
 *       @enum Interface Abilities
 *       @abstract Constants defining interface offload support.
 *       @constant IFNET_CSUM_IP Hardware will calculate IPv4 checksums.
 *       @constant IFNET_CSUM_TCP Hardware will calculate TCP checksums.
 *       @constant IFNET_CSUM_UDP Hardware will calculate UDP checksums.
 *       @constant IFNET_CSUM_FRAGMENT Hardware will checksum IP fragments.
 *       @constant IFNET_IP_FRAGMENT Hardware will fragment IP packets.
 *       @constant IFNET_CSUM_TCPIPV6 Hardware will calculate TCP IPv6 checksums.
 *       @constant IFNET_CSUM_UDPIPV6 Hardware will calculate UDP IPv6 checksums.
 *       @constant IFNET_IPV6_FRAGMENT Hardware will fragment IPv6 packets.
 *       @constant IFNET_VLAN_TAGGING Hardware will generate VLAN headers.
 *       @constant IFNET_VLAN_MTU Hardware supports VLAN MTU.
 *       @constant IFNET_MULTIPAGES Driver is capable of handling packets
 *               coming down from the network stack that reside in virtually,
 *               but not in physically contiguous span of the external mbuf
 *               clusters.  In this case, the data area of a packet in the
 *               external mbuf cluster might cross one or more physical
 *               pages that are disjoint, depending on the interface MTU
 *               and the packet size.  Such a use of larger than system page
 *               size clusters by the network stack is done for better system
 *               efficiency.  Drivers that utilize the IOMbufNaturalMemoryCursor
 *               with the getPhysicalSegmentsWithCoalesce interfaces and
 *               enumerate the list of vectors should set this flag for
 *               possible gain in performance during bulk data transfer.
 *       @constant IFNET_TSO_IPV4 Hardware supports IPv4 TCP Segment Offloading.
 *               If the Interface driver sets this flag, TCP will send larger frames (up to 64KB) as one
 *               frame to the adapter which will perform the final packetization. The maximum TSO segment
 *               supported by the interface can be set with "ifnet_set_tso_mtu". To retrieve the real MTU
 *               for the TCP connection the function "mbuf_get_tso_requested" is used by the driver. Note
 *               that if TSO is active, all the packets will be flagged for TSO, not just large packets.
 *       @constant IFNET_TSO_IPV6 Hardware supports IPv6 TCP Segment Offloading.
 *               If the Interface driver sets this flag, TCP IPv6 will send larger frames (up to 64KB) as one
 *               frame to the adapter which will perform the final packetization. The maximum TSO segment
 *               supported by the interface can be set with "ifnet_set_tso_mtu". To retrieve the real MTU
 *               for the TCP IPv6 connection the function "mbuf_get_tso_requested" is used by the driver.
 *               Note that if TSO is active, all the packets will be flagged for TSO, not just large packets.
 *       @constant IFNET_TX_STATUS Driver supports returning a per packet
 *               transmission status (pass, fail or other errors) of whether
 *               the packet was successfully transmitted on the link, or the
 *               transmission was aborted, or transmission failed.
 *
 */

enum {
	IFNET_CSUM_IP           = 0x00000001,
	IFNET_CSUM_TCP          = 0x00000002,
	IFNET_CSUM_UDP          = 0x00000004,
	IFNET_CSUM_FRAGMENT     = 0x00000008,
	IFNET_IP_FRAGMENT       = 0x00000010,
	IFNET_CSUM_TCPIPV6      = 0x00000020,
	IFNET_CSUM_UDPIPV6      = 0x00000040,
	IFNET_IPV6_FRAGMENT     = 0x00000080,
	IFNET_VLAN_TAGGING      = 0x00010000,
	IFNET_VLAN_MTU          = 0x00020000,
	IFNET_MULTIPAGES        = 0x00100000,
	IFNET_TSO_IPV4          = 0x00200000,
	IFNET_TSO_IPV6          = 0x00400000,
	IFNET_TX_STATUS         = 0x00800000,
	IFNET_HW_TIMESTAMP      = 0x01000000,
	IFNET_SW_TIMESTAMP      = 0x02000000
};
/*!
 *       @typedef ifnet_offload_t
 *       @abstract Flags indicating the offload support of the interface.
 */
typedef u_int32_t ifnet_offload_t;


/*
 * Callbacks
 *
 * These are function pointers you supply to the kernel in the interface.
 */
/*!
 *       @typedef bpf_packet_func
 *
 *       @discussion bpf_packet_func The bpf_packet_func is used to intercept
 *               inbound and outbound packets. The tap function will never free
 *               the mbuf. The tap function will only copy the mbuf in to various
 *               bpf file descriptors tapping this interface.
 *       @param interface The interface being sent or received on.
 *       @param data The packet to be transmitted or received.
 *       @result An errno value or zero upon success.
 */
/* Fast path - do not block or spend excessive amounts of time */
typedef errno_t (*bpf_packet_func)(ifnet_t interface, mbuf_t data);

/*!
 *       @typedef ifnet_output_func
 *
 *       @discussion ifnet_output_func is used to transmit packets. The stack
 *               will pass fully formed packets, including frame header, to the
 *               ifnet_output function for an interface. The driver is
 *               responsible for freeing the mbuf.
 *       @param interface The interface being sent on.
 *       @param data The packet to be sent.
 */
/* Fast path - do not block or spend excessive amounts of time */
typedef errno_t (*ifnet_output_func)(ifnet_t interface, mbuf_t data);

/*!
 *       @typedef ifnet_ioctl_func
 *       @discussion ifnet_ioctl_func is used to communicate ioctls from the
 *               stack to the driver.
 *
 *               All undefined ioctls are reserved for future use by Apple. If
 *               you need to communicate with your kext using an ioctl, please
 *               use SIOCSIFKPI and SIOCGIFKPI.
 *       @param interface The interface the ioctl is being sent to.
 *       @param cmd The ioctl command.
 *       @param data A pointer to any data related to the ioctl.
 */
typedef errno_t (*ifnet_ioctl_func)(ifnet_t interface, unsigned long cmd,
    void *data);

/*!
 *       @typedef ifnet_set_bpf_tap
 *       @discussion Deprecated. Specify NULL. Call bpf_tap_in/bpf_tap_out
 *               for all packets.
 */
typedef errno_t (*ifnet_set_bpf_tap)(ifnet_t interface, bpf_tap_mode mode,
    bpf_packet_func callback);

/*!
 *       @typedef ifnet_detached_func
 *       @discussion ifnet_detached_func is called an interface is detached
 *               from the list of interfaces. When ifnet_detach is called, it may
 *               not detach the interface immediately if protocols are attached.
 *               ifnet_detached_func is used to notify the interface that it has
 *               been detached from the networking stack. This is the last
 *               function that will be called on an interface. Until this
 *               function returns, you must not unload a kext supplying function
 *               pointers to this interface, even if ifnet_detacah has been
 *               called. Your detach function may be called during your call to
 *               ifnet_detach.
 *       @param interface The interface that has been detached.
 *               event.
 */
typedef void (*ifnet_detached_func)(ifnet_t interface);

/*!
 *       @typedef ifnet_demux_func
 *       @discussion ifnet_demux_func is called for each inbound packet to
 *               determine which protocol family the packet belongs to. This
 *               information is then used by the stack to determine which
 *               protocol to pass the packet to.  This function may return
 *               protocol families for protocols that are not attached. If the
 *               protocol family has not been attached to the interface, the
 *               packet will be discarded.
 *       @param interface The interface the packet was received on.
 *       @param packet The mbuf containing the packet.
 *       @param frame_header A pointer to the frame header.
 *       @param protocol_family Upon return, the protocol family matching the
 *               packet should be stored here.
 *       @result
 *               If the result is zero, processing will continue normally.
 *               If the result is EJUSTRETURN, processing will stop but the
 *                       packet will not be freed.
 *               If the result is anything else, the processing will stop and
 *                       the packet will be freed.
 */
typedef errno_t (*ifnet_demux_func)(ifnet_t interface, mbuf_t packet,
    char *frame_header, protocol_family_t *protocol_family);

/*!
 *       @typedef ifnet_event_func
 *       @discussion ifnet_event_func is called when an event occurs on a
 *               specific interface.
 *       @param interface The interface the event occurred on.
 */
typedef void (*ifnet_event_func)(ifnet_t interface, const struct kev_msg *msg);

/*!
 *       @typedef ifnet_framer_func
 *       @discussion ifnet_framer_func is called for each outbound packet to
 *               give the interface an opportunity to prepend interface specific
 *               headers.
 *       @param interface The interface the packet is being sent on.
 *       @param packet Pointer to the mbuf containing the packet, caller may
 *               set this to a different mbuf upon return. This can happen if the
 *               frameout function needs to prepend another mbuf to the chain to
 *               have enough space for the header.
 *       @param dest The higher layer protocol destination (i.e. IP address).
 *       @param dest_linkaddr The link layer address as determined by the
 *               protocol's pre-output function.
 *       @param frame_type The frame type as determined by the protocol's
 *               pre-output function.
 *       @discussion prepend_len The length of prepended bytes to the mbuf.
 *               (ONLY used if KPI_INTERFACE_EMBEDDED is defined to 1)
 *       @discussion postpend_len The length of the postpended bytes to the mbuf.
 *               (ONLY used if KPI_INTERFACE_EMBEDDED is defined to 1)
 *       @result
 *               If the result is zero, processing will continue normally.
 *               If the result is EJUSTRETURN, processing will stop but the
 *                       packet will not be freed.
 *               If the result is anything else, the processing will stop and
 *                       the packet will be freed.
 */
typedef errno_t (*ifnet_framer_func)(ifnet_t interface, mbuf_t *packet,
    const struct sockaddr *dest, const char *dest_linkaddr,
    const char *frame_type
#if KPI_INTERFACE_EMBEDDED
    , u_int32_t *prepend_len, u_int32_t *postpend_len
#endif /* KPI_INTERFACE_EMBEDDED */
    );

/*!
 *       @typedef ifnet_add_proto_func
 *       @discussion if_add_proto_func is called by the stack when a protocol
 *               is attached to an interface. This gives the interface an
 *               opportunity to get a list of protocol description structures
 *               for demuxing packets to this protocol (demux descriptors).
 *       @param interface The interface the protocol will be attached to.
 *       @param protocol_family The family of the protocol being attached.
 *       @param demux_array An array of demux descriptors that describe
 *               the interface specific ways of identifying packets belonging
 *               to this protocol family.
 *       @param demux_count The number of demux descriptors in the array.
 *       @result
 *               If the result is zero, processing will continue normally.
 *               If the result is anything else, the add protocol will be
 *                       aborted.
 */
typedef errno_t (*ifnet_add_proto_func)(ifnet_t interface,
    protocol_family_t protocol_family,
    const struct ifnet_demux_desc *demux_array, u_int32_t demux_count);

/*!
 *       @typedef if_del_proto_func
 *       @discussion if_del_proto_func is called by the stack when a protocol
 *               is being detached from an interface. This gives the interface an
 *               opportunity to free any storage related to this specific
 *               protocol being attached to this interface.
 *       @param interface The interface the protocol will be detached from.
 *       @param protocol_family The family of the protocol being detached.
 *       @result
 *               If the result is zero, processing will continue normally.
 *               If the result is anything else, the detach will continue
 *                       and the error will be returned to the caller.
 */
typedef errno_t (*ifnet_del_proto_func)(ifnet_t interface,
    protocol_family_t protocol_family);

/*!
 *       @typedef ifnet_check_multi
 *       @discussion ifnet_check_multi is called for each multicast address
 *               added to an interface. This gives the interface an opportunity
 *               to reject invalid multicast addresses before they are attached
 *               to the interface.
 *
 *               To prevent an address from being added to your multicast list,
 *               return EADDRNOTAVAIL. If you don't know how to parse/translate
 *               the address, return EOPNOTSUPP.
 *       @param interface The interface.
 *       @param mcast The multicast address.
 *       @result
 *               Zero upon success, EADDRNOTAVAIL on invalid multicast,
 *               EOPNOTSUPP for addresses the interface does not understand.
 */
typedef errno_t (*ifnet_check_multi)(ifnet_t interface,
    const struct sockaddr *mcast);

/*!
 *       @typedef proto_media_input
 *       @discussion proto_media_input is called for all inbound packets for
 *               a specific protocol on a specific interface. This function is
 *               registered on an interface using ifnet_attach_protocol.
 *       @param ifp The interface the packet was received on.
 *       @param protocol The protocol of the packet received.
 *       @param packet The packet being input.
 *       @param header The frame header.
 *       @result
 *               If the result is zero, the caller will assume the packet was
 *                       passed to the protocol.
 *               If the result is non-zero and not EJUSTRETURN, the caller will
 *                       free the packet.
 */
typedef errno_t (*proto_media_input)(ifnet_t ifp, protocol_family_t protocol,
    mbuf_t packet, char *header);

/*!
 *       @typedef proto_media_input_v2
 *       @discussion proto_media_input_v2 is called for all inbound packets for
 *               a specific protocol on a specific interface. This function is
 *               registered on an interface using ifnet_attach_protocolv2.
 *               proto_media_input_v2 differs from proto_media_input in that it
 *               will be called for a list of packets instead of once for each
 *               individual packet. The frame header can be retrieved using
 *               mbuf_pkthdr_header.
 *       @param ifp The interface the packet was received on.
 *       @param protocol The protocol of the packet received.
 *       @param packet The packet being input.
 *       @result
 *               If the result is zero, the caller will assume the packets were
 *                       passed to the protocol.
 *               If the result is non-zero and not EJUSTRETURN, the caller will
 *                       free the packets.
 */
typedef errno_t (*proto_media_input_v2)(ifnet_t ifp, protocol_family_t protocol,
    mbuf_t packet);

/*!
 *       @typedef proto_media_preout
 *       @discussion proto_media_preout is called just before the packet
 *               is transmitted. This gives the proto_media_preout function an
 *               opportunity to specify the media specific frame type and
 *               destination.
 *       @param ifp The interface the packet will be sent on.
 *       @param protocol The protocol of the packet being sent
 *               (PF_INET/etc...).
 *       @param packet The packet being sent.
 *       @param dest The protocol level destination address.
 *       @param route A pointer to the routing structure for the packet.
 *       @param frame_type The media specific frame type.
 *       @param link_layer_dest The media specific destination.
 *       @result
 *               If the result is zero, processing will continue normally. If the
 *               result is non-zero, processing will stop. If the result is
 *               non-zero and not EJUSTRETURN, the packet will be freed by the
 *               caller.
 */
typedef errno_t (*proto_media_preout)(ifnet_t ifp, protocol_family_t protocol,
    mbuf_t *packet, const struct sockaddr *dest, void *route, char *frame_type,
    char *link_layer_dest);

/*!
 *       @typedef proto_media_event
 *       @discussion proto_media_event is called to notify this layer of
 *               interface specific events.
 *       @param ifp The interface.
 *       @param protocol The protocol family.
 *       @param event The event.
 */
typedef void (*proto_media_event)(ifnet_t ifp, protocol_family_t protocol,
    const struct kev_msg *event);

/*!
 *       @typedef proto_media_ioctl
 *       @discussion proto_media_event allows this layer to handle ioctls.
 *               When an ioctl is handled, it is passed to the interface filters,
 *               protocol filters, protocol, and interface. If you do not support
 *               this ioctl, return EOPNOTSUPP. If you successfully handle the
 *               ioctl, return zero. If you return any error other than
 *               EOPNOTSUPP, other parts of the stack may not get an opportunity
 *               to process the ioctl. If you return EJUSTRETURN, processing will
 *               stop and a result of zero will be returned to the caller.
 *
 *               All undefined ioctls are reserved for future use by Apple. If
 *               you need to communicate with your kext using an ioctl, please
 *               use SIOCSIFKPI and SIOCGIFKPI.
 *       @param ifp The interface.
 *       @param protocol The protocol family.
 *       @param command The ioctl command.
 *       @param argument The argument to the ioctl.
 *       @result
 *               See the discussion.
 */
typedef errno_t (*proto_media_ioctl)(ifnet_t ifp, protocol_family_t protocol,
    unsigned long command, void *argument);

/*!
 *       @typedef proto_media_detached
 *       @discussion proto_media_detached notifies you that your protocol
 *               has been detached.
 *       @param ifp The interface.
 *       @param protocol The protocol family.
 *       @result
 *               See the discussion.
 */
typedef errno_t (*proto_media_detached)(ifnet_t ifp, protocol_family_t protocol);

/*!
 *       @typedef proto_media_resolve_multi
 *       @discussion proto_media_resolve_multi is called to resolve a
 *               protocol layer mulitcast address to a link layer multicast
 *               address.
 *       @param ifp The interface.
 *       @param proto_addr The protocol address.
 *       @param out_ll A sockaddr_dl to copy the link layer multicast in to.
 *       @param ll_len The length of data allocated for out_ll.
 *       @result Return zero on success or an errno error value on failure.
 */
typedef errno_t (*proto_media_resolve_multi)(ifnet_t ifp,
    const struct sockaddr *proto_addr, struct sockaddr_dl *out_ll,
    size_t ll_len);

/*!
 *       @typedef proto_media_send_arp
 *       @discussion proto_media_send_arp is called by the stack to generate
 *               an ARP packet. This field is currently only used with IP. This
 *               function should inspect the parameters and transmit an arp
 *               packet using the information passed in.
 *       @param ifp The interface the arp packet should be sent on.
 *       @param arpop The arp operation (usually ARPOP_REQUEST or
 *               ARPOP_REPLY).
 *       @param sender_hw The value to use for the sender hardware
 *               address field. If this is NULL, use the hardware address
 *               of the interface.
 *       @param sender_proto The value to use for the sender protocol
 *               address field. This will not be NULL.
 *       @param target_hw The value to use for the target hardware address.
 *               If this is NULL, the target hardware address in the ARP packet
 *               should be NULL and the link-layer destination for the back
 *               should be a broadcast. If this is not NULL, this value should be
 *               used for both the link-layer destination and the target hardware
 *               address.
 *       @param target_proto The target protocol address. This will not be
 *               NULL.
 *       @result Return zero on success or an errno error value on failure.
 */
typedef errno_t (*proto_media_send_arp)(ifnet_t ifp, u_short arpop,
    const struct sockaddr_dl *sender_hw, const struct sockaddr *sender_proto,
    const struct sockaddr_dl *target_hw, const struct sockaddr *target_proto);

/*!
 *       @struct ifnet_stat_increment_param
 *       @discussion This structure is used increment the counters on a
 *               network interface.
 *       @field packets_in The number of packets received.
 *       @field bytes_in The number of bytes received.
 *       @field errors_in The number of receive errors.
 *       @field packets_out The number of packets transmitted.
 *       @field bytes_out The number of bytes transmitted.
 *       @field errors_out The number of transmission errors.
 *       @field collisions The number of collisions seen by this interface.
 *       @field dropped The number of packets dropped.
 */
struct ifnet_stat_increment_param {
	u_int32_t                               packets_in;
	u_int32_t                               bytes_in;
	u_int32_t                               errors_in;

	u_int32_t                               packets_out;
	u_int32_t                               bytes_out;
	u_int32_t                               errors_out;

	u_int32_t                               collisions;
	u_int32_t                               dropped;
};

/*!
 *       @struct ifnet_init_params
 *       @discussion This structure is used to define various properties of
 *               the interface when calling ifnet_allocate. A copy of these
 *               values will be stored in the ifnet and cannot be modified
 *               while the interface is attached.
 *       @field uniqueid An identifier unique to this instance of the
 *               interface.
 *       @field uniqueid_len The length, in bytes, of the uniqueid.
 *       @field name The interface name (i.e. en).
 *       @field unit The interface unit number (en0's unit number is 0).
 *       @field family The interface family.
 *       @field type The interface type (see sys/if_types.h). Must be less
 *               than 256. For new types, use IFT_OTHER.
 *       @field output The output function for the interface. Every packet the
 *               stack attempts to send through this interface will go out
 *               through this function.
 *       @field demux The function used to determine the protocol family of an
 *               incoming packet.
 *       @field add_proto The function used to attach a protocol to this
 *               interface.
 *       @field del_proto The function used to remove a protocol from this
 *               interface.
 *       @field framer The function used to frame outbound packets, may be NULL.
 *       @field softc Driver specific storage. This value can be retrieved from
 *               the ifnet using the ifnet_softc function.
 *       @field ioctl The function used to handle ioctls.
 *       @field set_bpf_tap The function used to set the bpf_tap function.
 *       @field detach The function called to let the driver know the interface
 *               has been detached.
 *       @field event The function to notify the interface of various interface
 *               specific kernel events.
 *       @field broadcast_addr The link-layer broadcast address for this
 *               interface.
 *       @field broadcast_len The length of the link-layer broadcast address.
 */
struct ifnet_init_params {
	/* used to match recycled interface */
	const void              *uniqueid;              /* optional */
	u_int32_t               uniqueid_len;           /* optional */

	/* used to fill out initial values for interface */
	const char              *name;                  /* required */
	u_int32_t               unit;                   /* required */
	ifnet_family_t          family;                 /* required */
	u_int32_t               type;                   /* required */
	ifnet_output_func       output;                 /* required */
	ifnet_demux_func        demux;                  /* required  */
	ifnet_add_proto_func    add_proto;              /* required  */
	ifnet_del_proto_func    del_proto;              /* required  */
	ifnet_check_multi       check_multi;            /* required for non point-to-point interfaces */
	ifnet_framer_func       framer;                 /* optional */
	void                    *softc;                 /* optional */
	ifnet_ioctl_func        ioctl;                  /* optional */
	ifnet_set_bpf_tap       set_bpf_tap;            /* deprecated */
	ifnet_detached_func     detach;                 /* optional */
	ifnet_event_func        event;                  /* optional */
	const void              *broadcast_addr;        /* required for non point-to-point interfaces */
	u_int32_t               broadcast_len;          /* required for non point-to-point interfaces */
};


/*!
 *       @struct ifnet_stats_param
 *       @discussion This structure is used get and set the interface
 *               statistics.
 *       @field packets_in The number of packets received.
 *       @field bytes_in The number of bytes received.
 *       @field errors_in The number of receive errors.
 *       @field packets_out The number of packets transmitted.
 *       @field bytes_out The number of bytes transmitted.
 *       @field errors_out The number of transmission errors.
 *       @field collisions The number of collisions seen by this interface.
 *       @field dropped The number of packets dropped.
 */
struct ifnet_stats_param {
	u_int64_t       packets_in;
	u_int64_t       bytes_in;
	u_int64_t       multicasts_in;
	u_int64_t       errors_in;

	u_int64_t       packets_out;
	u_int64_t       bytes_out;
	u_int64_t       multicasts_out;
	u_int64_t       errors_out;

	u_int64_t       collisions;
	u_int64_t       dropped;
	u_int64_t       no_protocol;
};

/*!
 *       @struct ifnet_demux_desc
 *       @discussion This structure is to identify packets that belong to a
 *               specific protocol. The types supported are interface specific.
 *               Ethernet supports ETHER_DESC_ETYPE2, ETHER_DESC_SAP, and
 *               ETHER_DESC_SNAP. The type defines the offset in the packet where
 *               the data will be matched as well as context. For example, if
 *               ETHER_DESC_SNAP is specified, the only valid datalen is 5 and
 *               only in the 5 bytes will only be matched when the packet header
 *               indicates that the packet is a SNAP packet.
 *       @field type The type of identifier data (i.e. ETHER_DESC_ETYPE2)
 *       @field data A pointer to an entry of type (i.e. pointer to 0x0800).
 *       @field datalen The number of bytes of data used to describe the
 *               packet.
 */
struct ifnet_demux_desc {
	u_int32_t       type;
	void            *data;
	u_int32_t       datalen;
};

/*!
 *       @struct ifnet_attach_proto_param
 *       @discussion This structure is used to attach a protocol to an
 *               interface. This structure provides the various functions for
 *               handling operations related to the protocol on the interface as
 *               well as information for how to demux packets for this protocol.
 *       @field demux_array An array of ifnet_demux_desc structures
 *               describing the protocol.
 *       @field demux_count The number of entries in the demux_array array.
 *       @field input The function to be called for inbound packets.
 *       @field pre_output The function to be called for outbound packets.
 *       @field event The function to be called for interface events.
 *       @field ioctl The function to be called for ioctls.
 *       @field detached The function to be called for handling the detach.
 */

struct ifnet_attach_proto_param {
	struct ifnet_demux_desc         *demux_array;   /* interface may/may not require */
	u_int32_t                       demux_count;    /* interface may/may not require */

	proto_media_input               input;          /* required */
	proto_media_preout              pre_output;     /* required */
	proto_media_event               event;          /* optional */
	proto_media_ioctl               ioctl;          /* optional */
	proto_media_detached            detached;       /* optional */
	proto_media_resolve_multi       resolve;        /* optional */
	proto_media_send_arp            send_arp;       /* optional */
};

struct ifnet_attach_proto_param_v2 {
	struct ifnet_demux_desc         *demux_array;   /* interface may/may not require */
	u_int32_t                       demux_count;    /* interface may/may not require */

	proto_media_input_v2            input;          /* required */
	proto_media_preout              pre_output;     /* required */
	proto_media_event               event;          /* optional */
	proto_media_ioctl               ioctl;          /* optional */
	proto_media_detached            detached;       /* optional */
	proto_media_resolve_multi       resolve;        /* optional */
	proto_media_send_arp            send_arp;       /* optional */
};

__BEGIN_DECLS

/*
 * Ifnet creation and reference counting
 */

/*!
 *       @function ifnet_allocate
 *       @discussion Allocate an ifnet_t with an initial refcount of 1. Many
 *               parts of the stack do not properly refcount the ifnet_t. In
 *               order to avoid freeing the ifnet_t while some parts of the stack
 *               may contain a reference to it, the ifnet_ts are only recycled,
 *               never freed. A unique id is used to try and recycle the same
 *               ifnet_t when allocating an interface. For example, for an
 *               ethernet interface, the hardware address of the ethernet card is
 *               usually used for the uniqueid. If a PC Card is removed and
 *               inserted again, if the ethernet address of the PC card is used,
 *               the same ifnet_t will be used for the card the second time it is
 *               inserted. In the future, when the ifnet_t is correctly
 *               refcounted by all of the stack, the interfaces may be freed and
 *               the unique ids ignored.
 *       @param init The initial values for the interface. These values can
 *               not be changed after the interface has been allocated.
 *       @param interface The interface allocated upon success.
 *       @result May return ENOMEM if there is insufficient memory or EEXIST
 *               if an interface with the same uniqueid and family has already
 *               been allocated and is in use.
 */
extern errno_t ifnet_allocate(const struct ifnet_init_params *init,
    ifnet_t *interface)
__NKE_API_DEPRECATED;


/*!
 *       @function ifnet_reference
 *       @discussion Increment the reference count of the ifnet to assure
 *               that it will not go away. The interface must already have at
 *               least one reference.
 *       @param interface The interface to increment the reference count of.
 *       @result May return EINVAL if the interface is not valid.
 */
extern errno_t ifnet_reference(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_release
 *       @discussion Release a reference of the ifnet, this may trigger a
 *               free if the reference count reaches 0.
 *       @param interface The interface to decrement the reference count of
 *               and possibly free.
 *       @result May return EINVAL if the interface is not valid.
 */
extern errno_t ifnet_release(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_attach
 *       @discussion Attaches an interface to the global interface list. The
 *               interface must be setup properly before calling attach. The
 *               stack will take a reference on the interface and hold it until
 *               ifnet_detach is called.
 *
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *       @param interface The interface to attach.
 *       @param ll_addr The link layer address of the interface. This is used
 *               to fill out the first ifaddr in the list of addresses for the
 *               interface. This parameter is not required for interfaces such as
 *               PPP that have no link-layer address.
 *       @result Will return an error if there is anything wrong with the
 *               interface.
 */
extern errno_t ifnet_attach(ifnet_t interface,
    const struct sockaddr_dl *ll_addr)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_detach
 *       @discussion Detaches the interface.
 *
 *               Call this to indicate this interface is no longer valid (i.e. PC
 *               Card was removed). This function will begin the process of
 *               removing knowledge of this interface from the stack.
 *
 *               The function will return before the interface is detached. The
 *               functions you supplied in to the interface may continue to be
 *               called. When the detach has been completed, your detached
 *               function will be called. Your kext must not unload until the
 *               detached function has been called. The interface will be
 *               properly freed when the reference count reaches zero.
 *
 *               An interface may not be attached again. You must call
 *               ifnet_allocate to create a new interface to attach.
 *
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *       @param interface The interface to detach.
 *       @result 0 on success, otherwise errno error.
 */
extern errno_t ifnet_detach(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_interface_family_find
 *       @discussion Look up the interface family identifier for a string.
 *               If there is no interface family identifier assigned for this string
 *               a new interface family identifier is created and assigned.
 *               It is recommended to use the bundle id of the KEXT as the string
 *               to avoid collisions with other KEXTs.
 *               The lookup operation is not optimized so a module should call this
 *               function once during startup and cache the interface family identifier.
 *               The interface family identifier for a string will not be re-assigned until
 *               the system reboots.
 *       @param module_string  A unique string identifying your interface family
 *       @param family_id Upon return, a unique interface family identifier for use with
 *               ifnet_* functions. This identifier is valid until the system
 *               is rebooted.
 *       @result 0 on success, otherwise errno error.
 */
extern errno_t ifnet_interface_family_find(const char *module_string, ifnet_family_t *family_id)
__NKE_API_DEPRECATED;

/*
 * Interface manipulation.
 */

/*!
 *       @function ifnet_softc
 *       @discussion Returns the driver's private storage on the interface.
 *       @param interface Interface to retrieve the storage from.
 *       @result Driver's private storage.
 */
extern void *ifnet_softc(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_name
 *       @discussion Returns a pointer to the name of the interface.
 *       @param interface Interface to retrieve the name from.
 *       @result Pointer to the name.
 */
extern const char *ifnet_name(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_family
 *       @discussion Returns the family of the interface.
 *       @param interface Interface to retrieve the family from.
 *       @result Interface family type.
 */
extern ifnet_family_t ifnet_family(ifnet_t interface)
__NKE_API_DEPRECATED;


/*!
 *       @function ifnet_unit
 *       @discussion Returns the unit number of the interface.
 *       @param interface Interface to retrieve the unit number from.
 *       @result Unit number.
 */
extern u_int32_t ifnet_unit(ifnet_t interface)
__NKE_API_DEPRECATED;


/*!
 *       @function ifnet_index
 *       @discussion Returns the index of the interface. This index value
 *               will match the index you would find in a sockaddr_dl or using
 *               if_nametoindex or if_indextoname in user space. The value of the
 *               interface index is undefined for an interface that is not
 *               currently attached.
 *       @param interface Interface to retrieve the index of.
 *       @result Index.
 */
extern u_int32_t ifnet_index(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_flags
 *       @discussion Sets the interface flags to match new_flags.
 *       @discussion Sets the interface flags to new_flags. This function
 *               lets you specify which flags you want to change using the mask.
 *               The kernel will effectively take the lock, then set the
 *               interface's flags to (if_flags & ~mask) | (new_flags & mask).
 *       @param interface Interface to set the flags on.
 *       @param new_flags The new set of flags that should be set. These
 *               flags are defined in net/if.h
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_flags(ifnet_t interface, u_int16_t new_flags,
    u_int16_t mask)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_flags
 *       @discussion Returns the interface flags that are set.
 *       @param interface Interface to retrieve the flags from.
 *       @result Flags. These flags are defined in net/if.h
 */
extern u_int16_t ifnet_flags(ifnet_t interface)
__NKE_API_DEPRECATED;


/*!
 *       @function ifnet_set_capabilities_supported
 *       @discussion Specify the capabilities supported by the interface.
 *       @discussion  This function lets you specify which capabilities are supported
 *               by the interface. Typically this function is called by the driver when
 *               the interface gets attached to the system.
 *               The mask allows to control which capability to set or unset.
 *               The kernel will effectively take the lock, then set the
 *               interface's flags to (if_capabilities & ~mask) | (new_caps & mask).
 *
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *       @param interface Interface to set the capabilities on.
 *       @param new_caps The value of the capabilities that should be set or unset. These
 *               flags are defined in net/if.h
 *       @param mask Which capabilities that should be affected. These
 *               flags are defined in net/if.h
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_capabilities_supported(ifnet_t interface, u_int32_t new_caps,
    u_int32_t mask)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_capabilities_supported
 *       @discussion Retrieve the interface capabilities supported by the interface.
 *       @param interface Interface to retrieve the capabilities from.
 *       @result Flags. Capabilities flags are defined in net/if.h
 */
extern u_int32_t ifnet_capabilities_supported(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_capabilities_enabled
 *       @discussion Enable and/or disable the interface capabilities to match new_caps.
 *       @discussion Sets the interface capabilities to new_caps. This function
 *               lets you specify which capabilities you want to change using the mask.
 *               The kernel will effectively take the lock, then set the
 *               interface's flags to (if_capenable & ~mask) | (new_caps & mask).
 *
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *
 *               Typically this function is called by the driver when the interface is
 *               created to specify which of the supported capabilities are enabled by
 *               default. This function is also meant to be called when the driver handles
 *               the interface ioctl SIOCSIFCAP.
 *
 *               The driver should call ifnet_set_offlad() to indicate the corresponding
 *               hardware offload bits that will be used by the networking stack.
 *
 *               It is an error to enable a capability that is not marked as
 *               supported by the interface.
 *       @param interface Interface to set the capabilities on.
 *       @param new_caps The value of the capabilities that should be set or unset. These
 *               flags are defined in net/if.h
 *       @param mask Which capabilities that should be affected. These
 *               flags are defined in net/if.h
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_capabilities_enabled(ifnet_t interface, u_int32_t new_caps,
    u_int32_t mask)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_capabilities_enabled
 *       @discussion Retrieve the interface capabilities enabled on the interface.
 *       @param interface Interface to retrieve the capabilities from.
 *       @result Flags. Capabilities flags are defined in net/if.h
 */
extern u_int32_t ifnet_capabilities_enabled(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_offload
 *       @discussion Sets a bitfield to indicate special hardware offload
 *               support provided by the interface such as hardware checksums and
 *               VLAN. This replaces the if_hwassist flags field. Any flags
 *               unrecognized by the stack will not be set.
 *
 *               Note the system will automatically set the interface capabilities
 *               that correspond to the offload flags modified -- i.e. the driver
 *               does not have to call ifnet_set_capabilities_enabled() and
 *               ifnet_set_capabilities_supported().
 *       @param interface The interface.
 *       @param offload The new set of flags indicating which offload options
 *               the device supports.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_offload(ifnet_t interface, ifnet_offload_t offload)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_offload
 *       @discussion Returns flags indicating which operations can be
 *               offloaded to the interface.
 *       @param interface Interface to retrieve the offload from.
 *       @result Abilities flags, see ifnet_offload_t.
 */
extern ifnet_offload_t ifnet_offload(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_tso_mtu
 *       @discussion Sets maximum TCP Segmentation Offload segment size for
 *               the interface
 *       @param interface The interface.
 *       @param family The family for which the offload MTU is provided for
 *               (AF_INET or AF_INET6)
 *       @param mtuLen Maximum segment size supported by the interface
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_tso_mtu(ifnet_t interface, sa_family_t family,
    u_int32_t mtuLen)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_get_tso_mtu
 *       @discussion Returns maximum TCP Segmentation Offload segment size for
 *               the interface
 *       @param interface The interface.
 *       @param family The family for which the offload MTU is provided for
 *               (AF_INET or AF_INET6)
 *       @param mtuLen Value of the maximum MTU supported for the interface
 *               and family provided.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_get_tso_mtu(ifnet_t interface, sa_family_t family,
    u_int32_t *mtuLen)
__NKE_API_DEPRECATED;

/*!
 *       @enum Interface wake properties
 *       @abstract Constants defining Interface wake properties.
 *       @constant IFNET_WAKE_ON_MAGIC_PACKET Wake on Magic Packet.
 */
enum {
	IFNET_WAKE_ON_MAGIC_PACKET = 0x01
};

/*!
 *       @function ifnet_set_wake_flags
 *       @discussion Sets the wake properties of the underlying hardware. These are
 *               typically set by the driver.
 *       @param interface The interface.
 *       @param properties Properties to set or unset.
 *       @param mask Mask of the properties to set of unset.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_wake_flags(ifnet_t interface, u_int32_t properties, u_int32_t mask)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_get_wake_flags
 *       @discussion Returns the wake properties set on the interface.
 *       @param interface The interface.
 *       @result The wake properties
 */
extern u_int32_t ifnet_get_wake_flags(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_link_mib_data
 *       @discussion Sets the mib link data. The ifnet_t will store the
 *               pointer you supply and copy mibLen bytes from the pointer
 *               whenever the sysctl for getting interface specific MIB data is
 *               used. Since the ifnet_t stores a pointer to your data instead of
 *               a copy, you may update the data at the address at any time.
 *
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *       @param interface Interface to set the unit number of.
 *       @param mibData A pointer to the data.
 *       @param mibLen Length of data pointed to.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_link_mib_data(ifnet_t interface, void *mibData,
    u_int32_t mibLen)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_get_link_mib_data
 *       @discussion Copies the link MIB data in to mibData, up to mibLen
 *               bytes. Returns error if the buffer is too small to hold all of
 *               the MIB data.
 *       @param interface The interface.
 *       @param mibData A pointer to space for the mibData to be copied in
 *               to.
 *       @param mibLen When calling, this should be the size of the buffer
 *               passed in mibData. Upon return, this will be the size of data
 *               copied in to mibData.
 *       @result Returns an error if the buffer size is too small or there is
 *               no data.
 */
extern errno_t ifnet_get_link_mib_data(ifnet_t interface, void *mibData,
    u_int32_t *mibLen)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_get_link_mib_data_length
 *       @discussion Retrieve the size of the mib data.
 *       @param interface The interface.
 *       @result Returns the number of bytes of mib data associated with the
 *               interface.
 */
extern u_int32_t ifnet_get_link_mib_data_length(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_attach_protocol
 *       @discussion Attaches a protocol to an interface.
 *       @param interface The interface.
 *       @param protocol_family The protocol family being attached
 *               (PF_INET/PF_INET6/etc...).
 *       @param proto_details Details of the protocol being attached.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_attach_protocol(ifnet_t interface,
    protocol_family_t protocol_family,
    const struct ifnet_attach_proto_param *proto_details)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_attach_protocol_v2
 *       @discussion Attaches a protocol to an interface using the newer
 *           version 2 style interface. So far the only difference is support
 *           for packet chains which improve performance.
 *       @param interface The interface.
 *       @param protocol_family The protocol family being attached
 *               (PF_INET/PF_INET6/etc...).
 *       @param proto_details Details of the protocol being attached.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_attach_protocol_v2(ifnet_t interface,
    protocol_family_t protocol_family,
    const struct ifnet_attach_proto_param_v2 *proto_details)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_detach_protocol
 *       @discussion Detaches a protocol from an interface.
 *       @param interface The interface.
 *       @param protocol_family The protocol family of the protocol to
 *               detach.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_detach_protocol(ifnet_t interface,
    protocol_family_t protocol_family)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_output
 *       @discussion Handles an outbound packet on the interface by calling
 *               any filters, a protocol preoutput function, the interface framer
 *               function, and finally the interface's output function. The
 *               protocol_family will be used to apply protocol filters and
 *               determine which preoutput function to call. The route and dest
 *               parameters will be passed to the preoutput function defined for
 *               the attachment of the specified protocol to the specified
 *               interface. ifnet_output will always free the mbuf chain.
 *       @param interface The interface.
 *       @param protocol_family The family of the protocol generating this
 *               packet (i.e. AF_INET).
 *       @param packet The packet to be transmitted.
 *       @param route A pointer to a routing structure for this packet. The
 *               preoutput function determines whether this value may be NULL or
 *               not.
 *       @param dest The destination address of protocol_family type. This
 *               will be passed to the preoutput function. If the preoutput
 *               function does not require this value, you may pass NULL.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_output(ifnet_t interface,
    protocol_family_t protocol_family, mbuf_t packet, void *route,
    const struct sockaddr *dest)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_output_raw
 *       @discussion Handles and outbond raw packet on the interface by
 *               calling any filters followed by the interface's output function.
 *               protocol_family may be zero. If the packet is from a specific
 *               protocol the protocol_family will be used to apply protocol
 *               filters. All interface filters will be applied to the outgoing
 *               packet. Processing, such as calling the protocol preoutput and
 *               interface framer functions will be bypassed. The packet will
 *               pass through the filters and be sent on the interface as is.
 *               ifnet_output_raw will always free the packet chain.
 *       @param interface The interface.
 *       @param protocol_family The family of the protocol generating this
 *               packet (i.e. AF_INET).
 *       @param packet The fully formed packet to be transmitted.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_output_raw(ifnet_t interface,
    protocol_family_t protocol_family, mbuf_t packet)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_input
 *       @discussion Inputs packets from the interface. The interface's demux
 *               will be called to determine the protocol. Once the protocol is
 *               determined, the interface filters and protocol filters will be
 *               called. From there, the packet will be passed to the registered
 *               protocol. If there is an error, the mbuf chain will be freed.
 *       @param interface The interface.
 *       @param first_packet The first packet in a chain of packets.
 *       @param stats Counts to be integrated in to the stats. The interface
 *               statistics will be incremented by the amounts specified in
 *               stats. This parameter may be NULL.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_input(ifnet_t interface, mbuf_t first_packet,
    const struct ifnet_stat_increment_param *stats)
__NKE_API_DEPRECATED;


/*!
 *       @function ifnet_ioctl
 *       @discussion Calls the interface's ioctl function with the parameters
 *               passed.
 *
 *               All undefined ioctls are reserved for future use by Apple. If
 *               you need to communicate with your kext using an ioctl, please
 *               use SIOCSIFKPI and SIOCGIFKPI.
 *       @param interface The interface.
 *       @param protocol The protocol family of the protocol to send the
 *               ioctl to (may be zero). Some ioctls apply to a protocol while
 *               other ioctls apply to just an interface.
 *       @param ioctl_code The ioctl to perform.
 *       @param ioctl_arg Any parameters to the ioctl.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_ioctl(ifnet_t interface, protocol_family_t protocol,
    unsigned long ioctl_code, void *ioctl_arg)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_event
 *       @discussion Calls the interface's event function.
 *       @param interface The interface.
 *       @param event_ptr Pointer to an kern_event structure describing the
 *               event.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_event(ifnet_t interface, struct kern_event_msg *event_ptr)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_mtu
 *       @discussion Sets the value of the MTU in the interface structure.
 *               Calling this function will not notify the driver that the MTU
 *               should be changed. Use the appropriate ioctl.
 *
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *       @param interface The interface.
 *       @param mtu The new MTU.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_mtu(ifnet_t interface, u_int32_t mtu)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_mtu
 *       @param interface The interface.
 *       @result The MTU.
 */
extern u_int32_t ifnet_mtu(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_type
 *       @param interface The interface.
 *       @result The type. See net/if_types.h.
 */
extern u_int8_t ifnet_type(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_addrlen
 *       @discussion
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *       @param interface The interface.
 *       @param addrlen The new address length.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_addrlen(ifnet_t interface, u_int8_t addrlen)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_addrlen
 *       @param interface The interface.
 *       @result The address length.
 */
extern u_int8_t ifnet_addrlen(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_hdrlen
 *       @discussion
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *       @param interface The interface.
 *       @param hdrlen The new header length.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_hdrlen(ifnet_t interface, u_int8_t hdrlen)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_hdrlen
 *       @param interface The interface.
 *       @result The header length.
 */
extern u_int8_t ifnet_hdrlen(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_metric
 *       @discussion
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *       @param interface The interface.
 *       @param metric The new metric.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_metric(ifnet_t interface, u_int32_t metric)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_metric
 *       @param interface The interface.
 *       @result The metric.
 */
extern u_int32_t ifnet_metric(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_baudrate
 *       @discussion
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *       @param interface The interface.
 *       @param baudrate The new baudrate.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_baudrate(ifnet_t interface, u_int64_t baudrate)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_baudrate
 *       @param interface The interface.
 *       @result The baudrate.
 */
extern u_int64_t ifnet_baudrate(ifnet_t interface)
__NKE_API_DEPRECATED;


/*!
 *       @function ifnet_stat_increment
 *       @discussion
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *       @param interface The interface.
 *       @param counts A pointer to a structure containing the amount to
 *               increment each counter by. Any counts not appearing in the
 *               ifnet_counter_increment structure are handled in the stack.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_stat_increment(ifnet_t interface,
    const struct ifnet_stat_increment_param *counts)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_stat_increment_in
 *       @discussion
 *               This function is intended to be called by the driver. This
 *               function allows a driver to update the inbound interface counts.
 *               The most efficient time to update these counts is when calling
 *               ifnet_input.
 *
 *               A lock protects the counts, this makes the increment functions
 *               expensive. The increment function will update the lastchanged
 *               value.
 *       @param interface The interface.
 *       @param packets_in The number of additional packets received.
 *       @param bytes_in The number of additional bytes received.
 *       @param errors_in The number of additional receive errors.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_stat_increment_in(ifnet_t interface,
    u_int32_t packets_in, u_int32_t bytes_in, u_int32_t errors_in)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_stat_increment_out
 *       @discussion
 *               This function is intended to be called by the driver. This
 *               function allows a driver to update the outbound interface
 *               counts.
 *
 *               A lock protects the counts, this makes the increment functions
 *               expensive. The increment function will update the lastchanged
 *               value.
 *       @param interface The interface.
 *       @param packets_out The number of additional packets sent.
 *       @param bytes_out The number of additional bytes sent.
 *       @param errors_out The number of additional send errors.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_stat_increment_out(ifnet_t interface,
    u_int32_t packets_out, u_int32_t bytes_out, u_int32_t errors_out)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_stat
 *       @discussion
 *               This function is intended to be called by the driver. A kext
 *               must not call this function on an interface the kext does not
 *               own.
 *
 *               The one exception would be the case where a kext wants to zero
 *               all of the counters.
 *       @param interface The interface.
 *       @param stats The new stats values.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_stat(ifnet_t interface,
    const struct ifnet_stats_param *stats)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_stat
 *       @param interface The interface.
 *       @param out_stats Storage for the values.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_stat(ifnet_t interface,
    struct ifnet_stats_param *out_stats)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_promiscuous
 *       @discussion Enable or disable promiscuous mode on the interface. The
 *               interface keeps an internal count of the number of times
 *               promiscuous mode has been enabled. Promiscuous mode is only
 *               disabled when this count reaches zero. Be sure to disable
 *               promiscuous mode only once for every time you enable it.
 *       @param interface The interface to toggle promiscuous mode on.
 *       @param on If set, the number of promicuous on requests will be
 *               incremented. If this is the first request, promiscuous mode
 *               will be enabled. If this is not set, the number of promiscous
 *               clients will be decremented. If this causes the number to reach
 *               zero, promiscuous mode will be disabled.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_promiscuous(ifnet_t interface, int on)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_touch_lastchange
 *       @discussion Updates the lastchange value to now.
 *       @param interface The interface.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_touch_lastchange(ifnet_t interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_lastchange
 *       @param interface The interface.
 *       @param last_change A timeval struct to copy the last time changed in
 *               to.
 */
extern errno_t ifnet_lastchange(ifnet_t interface, struct timeval *last_change)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_get_address_list
 *       @discussion Get a list of addresses on the interface. Passing NULL
 *               for the interface will return a list of all addresses. The
 *               addresses will have their reference count bumped so they will
 *               not go away. Calling ifnet_free_address_list will decrement the
 *               refcount and free the array. If you wish to hold on to a
 *               reference to an ifaddr_t, be sure to bump the reference count
 *               before calling ifnet_free_address_list.
 *       @param interface The interface.
 *       @param addresses A pointer to a NULL terminated array of ifaddr_ts.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_get_address_list(ifnet_t interface, ifaddr_t **addresses)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_get_address_list_family
 *       @discussion Get a list of addresses on the interface. Passing NULL
 *               for the interface will return a list of all addresses. The
 *               addresses will have their reference count bumped so they will
 *               not go away. Calling ifnet_free_address_list will decrement the
 *               refcount and free the array. If you wish to hold on to a
 *               reference to an ifaddr_t, be sure to bump the reference count
 *               before calling ifnet_free_address_list. Unlike
 *               ifnet_get_address_list, this function lets the caller specify
 *               the address family to get a list of only a specific address type.
 *       @param interface The interface.
 *       @param addresses A pointer to a NULL terminated array of ifaddr_ts.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_get_address_list_family(ifnet_t interface,
    ifaddr_t **addresses, sa_family_t family)
__NKE_API_DEPRECATED;


/*!
 *       @function ifnet_free_address_list
 *       @discussion Free a list of addresses returned from
 *               ifnet_get_address_list. Decrements the refcounts and frees the
 *               memory used for the array of references.
 *       @param addresses An array of ifaddr_ts.
 */
extern void ifnet_free_address_list(ifaddr_t *addresses)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_set_lladdr
 *       @discussion Sets the link-layer address for this interface.
 *       @param interface The interface the link layer address is being
 *               changed on.
 *       @param lladdr A pointer to the raw link layer address (pointer to
 *               the 6 byte ethernet address for ethernet).
 *       @param lladdr_len The length, in bytes, of the link layer address.
 */
extern errno_t ifnet_set_lladdr(ifnet_t interface, const void *lladdr,
    size_t lladdr_len)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_lladdr_copy_bytes
 *       @discussion Copies the bytes of the link-layer address into the
 *               specified buffer.
 *       @param interface The interface to copy the link-layer address from.
 *       @param lladdr The buffer to copy the link-layer address in to.
 *       @param length The length of the buffer. This value must match the
 *               length of the link-layer address.
 */
extern errno_t ifnet_lladdr_copy_bytes(ifnet_t interface, void *lladdr,
    size_t length)
__NKE_API_DEPRECATED;


/*!
 *       @function ifnet_llbroadcast_copy_bytes
 *       @discussion Retrieves the link-layer broadcast address for this
 *               interface.
 *       @param interface The interface.
 *       @param addr A buffer to copy the broadcast address in to.
 *       @param bufferlen The length of the buffer at addr.
 *       @param out_len On return, the length of the broadcast address.
 */
extern errno_t ifnet_llbroadcast_copy_bytes(ifnet_t interface, void *addr,
    size_t bufferlen, size_t *out_len)
__NKE_API_DEPRECATED;


/*!
 *       @function ifnet_resolve_multicast
 *       @discussion Resolves a multicast address for an attached protocol to
 *               a link-layer address. If a link-layer address is passed in, the
 *               interface will verify that it is a valid multicast address.
 *       @param ifp The interface.
 *       @param proto_addr A protocol address to be converted to a link-layer
 *               address.
 *       @param ll_addr Storage for the resulting link-layer address.
 *       @param ll_len Length of the storage for the link-layer address.
 *       @result 0 on success. EOPNOTSUPP indicates the multicast address was
 *               not supported or could not be translated. Other errors may
 *               indicate other failures.
 */
extern errno_t ifnet_resolve_multicast(ifnet_t ifp,
    const struct sockaddr *proto_addr, struct sockaddr *ll_addr, size_t ll_len)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_add_multicast
 *       @discussion Joins a multicast and returns an ifmultiaddr_t with the
 *               reference count incremented for you. You are responsible for
 *               decrementing the reference count after calling
 *               ifnet_remove_multicast and making sure you no longer have any
 *               references to the multicast.
 *       @param interface The interface.
 *       @param maddr The multicast address (AF_UNSPEC/AF_LINK) to join. Either
 *               a physical address or logical address to be translated to a
 *               physical address.
 *       @param multicast The resulting ifmultiaddr_t multicast address.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_add_multicast(ifnet_t interface,
    const struct sockaddr *maddr, ifmultiaddr_t *multicast)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_remove_multicast
 *       @discussion Causes the interface to leave the multicast group. The
 *               stack keeps track of how many times ifnet_add_multicast has been
 *               called for a given multicast address. The multicast will only be
 *               removed when the number of times ifnet_remove_multicast has been
 *               called matches the number of times ifnet_add_multicast has been
 *               called.
 *
 *               The memory for the multicast address is not actually freed until
 *               the separate reference count has reached zero. Some parts of the
 *               stack may keep a pointer to the multicast even after that
 *               multicast has been removed from the interface.
 *
 *               When an interface is detached, all of the multicasts are
 *               removed. If the interface of the multicast passed in is no
 *               longer attached, this function will gracefully return,
 *               performing no work.
 *
 *               It is the callers responsibility to release the multicast
 *               address after calling this function.
 *       @param multicast The multicast to be removed.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_remove_multicast(ifmultiaddr_t multicast)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_get_multicast_list
 *       @discussion Retrieves a list of multicast address the interface is
 *               set to receive. This function allocates and returns an array of
 *               references to the various multicast addresses. The multicasts
 *               have their reference counts bumped on your behalf. Calling
 *               ifnet_free_multicast_list will decrement the reference counts
 *               and free the array.
 *       @param interface The interface.
 *       @param addresses A pointer to a NULL terminated array of references
 *               to the multicast addresses.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_get_multicast_list(ifnet_t interface,
    ifmultiaddr_t **addresses)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_free_multicast_list
 *       @discussion Frees a list of multicasts returned by
 *               ifnet_get_multicast_list. Decrements the refcount on each
 *               multicast address and frees the array.
 *       @param multicasts An array of references to the multicast addresses.
 */
extern void ifnet_free_multicast_list(ifmultiaddr_t *multicasts)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_find_by_name
 *       @discussion Find an interface by the name including the unit number.
 *               Caller must call ifnet_release on any non-null interface return
 *               value.
 *       @param ifname The name of the interface, including any unit number
 *               (i.e. "en0").
 *       @param interface A pointer to an interface reference. This will be
 *               filled in if a matching interface is found.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_find_by_name(const char *ifname, ifnet_t *interface)
__NKE_API_DEPRECATED;

/*!
 *       @function ifnet_list_get
 *       @discussion Get a list of attached interfaces. List will be set to
 *               point to an array allocated by ifnet_list_get. The interfaces
 *               are refcounted and the counts will be incremented before the
 *               function returns. The list of interfaces must be freed using
 *               ifnet_list_free.
 *       @param family The interface family (i.e. IFNET_FAMILY_ETHERNET). To
 *               find interfaces of all families, use IFNET_FAMILY_ANY.
 *       @param interfaces A pointer to an array of interface references.
 *       @param count A pointer that will be filled in with the number of
 *               matching interfaces in the array.
 *       @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_list_get(ifnet_family_t family, ifnet_t **interfaces,
    u_int32_t *count)
__NKE_API_DEPRECATED;


/*!
 *       @function ifnet_list_free
 *       @discussion Free a list of interfaces returned by ifnet_list_get.
 *               Decrements the reference count on each interface and frees the
 *               array of references. If you keep a reference to an interface, be
 *               sure to increment the reference count before calling
 *               ifnet_list_free.
 *       @param interfaces An array of interface references from ifnet_list_get.
 */
extern void ifnet_list_free(ifnet_t *interfaces)
__NKE_API_DEPRECATED;

/******************************************************************************/
/* ifaddr_t accessors                                                         */
/******************************************************************************/

/*!
 *       @function ifaddr_reference
 *       @discussion Increment the reference count of an address tied to an
 *               interface.
 *       @param ifaddr The interface address.
 *       @result 0 upon success
 */
extern errno_t ifaddr_reference(ifaddr_t ifaddr)
__NKE_API_DEPRECATED;

/*!
 *       @function ifaddr_release
 *       @discussion Decrements the reference count of and possibly frees an
 *               address tied to an interface.
 *       @param ifaddr The interface address.
 *       @result 0 upon success
 */
extern errno_t ifaddr_release(ifaddr_t ifaddr)
__NKE_API_DEPRECATED;

/*!
 *       @function ifaddr_address
 *       @discussion Copies the address out of the ifaddr.
 *       @param ifaddr The interface address.
 *       @param out_addr The sockaddr storage for the address.
 *       @param addr_size The size of the storage for the address.
 *       @result 0 upon success
 */
extern errno_t ifaddr_address(ifaddr_t ifaddr, struct sockaddr *out_addr,
    u_int32_t addr_size)
__NKE_API_DEPRECATED;

/*!
 *       @function ifaddr_address
 *       @discussion Returns the address family of the address.
 *       @param ifaddr The interface address.
 *       @result 0 on failure, address family on success.
 */
extern sa_family_t ifaddr_address_family(ifaddr_t ifaddr)
__NKE_API_DEPRECATED;

/*!
 *       @function ifaddr_dstaddress
 *       @discussion Copies the destination address out of the ifaddr.
 *       @param ifaddr The interface address.
 *       @param out_dstaddr The sockaddr storage for the destination address.
 *       @param dstaddr_size The size of the storage for the destination address.
 *       @result 0 upon success
 */
extern errno_t ifaddr_dstaddress(ifaddr_t ifaddr, struct sockaddr *out_dstaddr,
    u_int32_t dstaddr_size)
__NKE_API_DEPRECATED;

/*!
 *       @function ifaddr_netmask
 *       @discussion Copies the netmask out of the ifaddr.
 *       @param ifaddr The interface address.
 *       @param out_netmask The sockaddr storage for the netmask.
 *       @param netmask_size The size of the storage for the netmask.
 *       @result 0 upon success
 */
extern errno_t ifaddr_netmask(ifaddr_t ifaddr, struct sockaddr *out_netmask,
    u_int32_t netmask_size)
__NKE_API_DEPRECATED;

/*!
 *       @function ifaddr_ifnet
 *       @discussion Returns the interface the address is attached to. The
 *               reference is only valid until the ifaddr is released. If you
 *               need to hold a reference to the ifnet for longer than you hold a
 *               reference to the ifaddr, increment the reference using
 *               ifnet_reference.
 *       @param ifaddr The interface address.
 *       @result A reference to the interface the address is attached to.
 */
extern ifnet_t ifaddr_ifnet(ifaddr_t ifaddr)
__NKE_API_DEPRECATED;

/*!
 *       @function ifaddr_withaddr
 *       @discussion Returns an interface address with the address specified.
 *               Increments the reference count on the ifaddr before returning to
 *               the caller. Caller is responsible for calling ifaddr_release.
 *       @param address The address to search for.
 *       @result A reference to the interface address.
 */
extern ifaddr_t ifaddr_withaddr(const struct sockaddr *address)
__NKE_API_DEPRECATED;

/*!
 *       @function ifaddr_withdstaddr
 *       @discussion Returns an interface address for the interface address
 *               that matches the destination when the netmask is applied.
 *               Increments the reference count on the ifaddr before returning to
 *               the caller. Caller is responsible for calling ifaddr_release.
 *       @param destination The destination to search for.
 *       @result A reference to the interface address.
 */
extern ifaddr_t ifaddr_withdstaddr(const struct sockaddr *destination)
__NKE_API_DEPRECATED;
/*!
 *       @function ifaddr_withnet
 *       @discussion Returns an interface address for the interface with the
 *               network described by net. Increments the reference count on the
 *               ifaddr before returning to the caller. Caller is responsible for
 *               calling ifaddr_release.
 *       @param net The network to search for.
 *       @result A reference to the interface address.
 */
extern ifaddr_t ifaddr_withnet(const struct sockaddr *net)
__NKE_API_DEPRECATED;

/*!
 *       @function ifaddr_withroute
 *       @discussion Returns an interface address given a destination and
 *               gateway. Increments the reference count on the ifaddr before
 *               returning to the caller. Caller is responsible for calling
 *               ifaddr_release.
 *       @param flags Routing flags. See net/route.h, RTF_GATEWAY etc.
 *       @param destination The destination to search for.
 *       @param gateway A gateway to search for.
 *       @result A reference to the interface address.
 */
extern ifaddr_t ifaddr_withroute(int flags, const struct sockaddr *destination,
    const struct sockaddr *gateway)
__NKE_API_DEPRECATED;

/*!
 *       @function ifaddr_findbestforaddr
 *       @discussion Finds the best local address assigned to a specific
 *               interface to use when communicating with another address.
 *               Increments the reference count on the ifaddr before returning to
 *               the caller. Caller is responsible for calling ifaddr_release.
 *       @param addr The remote address.
 *       @param interface The local interface.
 *       @result A reference to the interface address.
 */
extern ifaddr_t ifaddr_findbestforaddr(const struct sockaddr *addr,
    ifnet_t interface)
__NKE_API_DEPRECATED;

/******************************************************************************/
/* ifmultiaddr_t accessors                                                    */
/******************************************************************************/

/*!
 *       @function ifmaddr_reference
 *       @discussion Increment the reference count of an interface multicast
 *               address.
 *       @param ifmaddr The interface multicast address.
 *       @result 0 on success. Only error will be EINVAL if ifmaddr is not valid.
 */
extern errno_t ifmaddr_reference(ifmultiaddr_t ifmaddr)
__NKE_API_DEPRECATED;

/*!
 *       @function ifmaddr_release
 *       @discussion Decrement the reference count of an interface multicast
 *               address. If the reference count reaches zero, the ifmultiaddr
 *               will be removed from the interface and the ifmultiaddr will be
 *               freed.
 *       @param ifmaddr The interface multicast address.
 *       @result 0 on success. Only error will be EINVAL if ifmaddr is not valid.
 */
extern errno_t ifmaddr_release(ifmultiaddr_t ifmaddr)
__NKE_API_DEPRECATED;

/*!
 *       @function ifmaddr_address
 *       @discussion Copies the multicast address to out_multicast.
 *       @param out_multicast Storage for a sockaddr.
 *       @param addr_size Size of the storage.
 *       @result 0 on success.
 */
extern errno_t ifmaddr_address(ifmultiaddr_t ifmaddr,
    struct sockaddr *out_multicast, u_int32_t addr_size)
__NKE_API_DEPRECATED;

/*!
 *       @function ifmaddr_lladdress
 *       @discussion Copies the link layer multicast address to
 *               out_link_layer_multicast.
 *       @param out_link_layer_multicast Storage for a sockaddr.
 *       @param addr_size Size of the storage.
 *       @result 0 on success.
 */
extern errno_t ifmaddr_lladdress(ifmultiaddr_t ifmaddr,
    struct sockaddr *out_link_layer_multicast, u_int32_t addr_size)
__NKE_API_DEPRECATED;

/*!
 *       @function ifmaddr_ifnet
 *       @discussion Returns the interface this multicast address is attached
 *               to. The interface reference count is not bumped by this
 *               function. The interface is only valid as long as you don't
 *               release the refernece to the multiast address. If you need to
 *               maintain your pointer to the ifnet, call ifnet_reference
 *               followed by ifnet_release when you're finished.
 *       @param ifmaddr The interface multicast address.
 *       @result A reference to the interface.
 */
extern ifnet_t ifmaddr_ifnet(ifmultiaddr_t ifmaddr)
__NKE_API_DEPRECATED;


__END_DECLS

#undef __NKE_API_DEPRECATED
#endif /* __KPI_INTERFACE__ */
