xnu-2422.1.72.tar.gz

[apple/xnu.git] / bsd / net / kpi_interface.h

/*
 * Copyright (c) 2004-2013 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
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 */
/*!
        @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__

#ifndef XNU_KERNEL_PRIVATE
#include <TargetConditionals.h>
#endif

#include <sys/kernel_types.h>

#ifdef KERNEL_PRIVATE
#include <sys/kpi_mbuf.h>
#endif /* KERNEL_PRIVATE */

#include <sys/_types/_sa_family_t.h>

#ifdef XNU_KERNEL_PRIVATE
#define KPI_INTERFACE_EMBEDDED 0
#else
#if TARGET_OS_EMBEDDED
#define KPI_INTERFACE_EMBEDDED 1
#else
#define KPI_INTERFACE_EMBEDDED 0
#endif
#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.
 */
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
};

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

#ifdef KERNEL_PRIVATE
/*
        @enum Interface Sub-families
        @abstract Constants defining interface sub-families (may also
                be viewed as the underlying transport).  Some families
                (e.g. IFNET_FAMILY_ETHERNET) are often too generic.
                These sub-families allow us to further refine the
                interface family, e.g. Ethernet over Wi-Fi/USB, etc.
 */
enum {
        IFNET_SUBFAMILY_ANY             = 0,
        IFNET_SUBFAMILY_USB             = 1,
        IFNET_SUBFAMILY_BLUETOOTH       = 2,
        IFNET_SUBFAMILY_WIFI            = 3,
        IFNET_SUBFAMILY_THUNDERBOLT     = 4,
};

/*
        @typedef ifnet_sub_family_t
        @abstract Storage type for the interface sub-family.
 */
typedef u_int32_t ifnet_subfamily_t;
#endif /* KERNEL_PRIVATE */

#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 retreive 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 retreive 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,
#ifdef KERNEL_PRIVATE
        IFNET_CSUM_PARTIAL      = 0x00001000,
        IFNET_CSUM_SUM16        = IFNET_CSUM_PARTIAL,
#endif /* KERNEL_PRIVATE */
        IFNET_VLAN_TAGGING      = 0x00010000,
        IFNET_VLAN_MTU          = 0x00020000,
        IFNET_MULTIPAGES        = 0x00100000,
        IFNET_TSO_IPV4          = 0x00200000,
        IFNET_TSO_IPV6          = 0x00400000,
        IFNET_TX_STATUS         = 0x00800000
};
/*!
        @typedef ifnet_offload_t
        @abstract Flags indicating the offload support of the interface.
*/
typedef u_int32_t ifnet_offload_t;

#ifdef KERNEL_PRIVATE
#define IFNET_OFFLOADF_BITS \
        "\020\1CSUM_IP\2CSUM_TCP\3CSUM_UDP\4CSUM_IP_FRAGS\5IP_FRAGMENT" \
        "\6CSUM_TCPIPV6\7CSUM_UDPIPV6\10IPV6_FRAGMENT\15CSUM_PARTIAL"    \
        "\20VLAN_TAGGING\21VLAN_MTU\25MULTIPAGES\26TSO_IPV4\27TSO_IPV6" \
        "\30TXSTATUS"
#endif /* KERNEL_PRIVATE */

/*
 * 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 proto_family The protocol family to handle the ioctl, may be
                zero for no protocol_family.
        @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.
        @param event_ptr Pointer to a kern_event structure describing the
                event.
 */
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.
        @param prepend_len The length of prepended bytes to the mbuf.
                (ONLY used if KPI_INTERFACE_EMBEDDED is defined to 1)
        @param 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 */
        );
#ifdef KERNEL_PRIVATE
typedef errno_t (*ifnet_framer_extended_func)(ifnet_t interface, mbuf_t *packet,
        const struct sockaddr *dest, const char *dest_linkaddr,
        const char *frame_type, u_int32_t *prepend_len,
        u_int32_t *postpend_len);
#endif /* KERNEL_PRIVATE */

/*!
        @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 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_family 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_family 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_family 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_family The protocol family.
        @param kev_msg 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_family 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_family 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 protocol_family The protocol family of the addresses
                (PF_INET).
        @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 */
};

#ifdef KERNEL_PRIVATE
/* Valid values for version */
#define IFNET_INIT_VERSION_2            2
#define IFNET_INIT_CURRENT_VERSION      IFNET_INIT_VERSION_2

/* Valid values for flags */
#define IFNET_INIT_LEGACY       0x1     /* legacy network interface model */
#define IFNET_INIT_INPUT_POLL   0x2     /* opportunistic input polling model */

/*
        @typedef ifnet_pre_enqueue_func
        @discussion ifnet_pre_enqueue_func is called for each outgoing packet
                for the interface. The driver may perform last-minute changes
                on the (fully formed) packet, but it is responsible for calling
                ifnet_enqueue() to enqueue the packet upon completion.
        @param interface The interface being sent on.
        @param data The packet to be sent.
 */
typedef errno_t (*ifnet_pre_enqueue_func)(ifnet_t interface, mbuf_t data);

/*
        @typedef ifnet_start_func
        @discussion ifnet_start_func is used to indicate to the driver that
                one or more packets may be dequeued by calling ifnet_dequeue()
                or ifnet_dequeue_multi(). This routine gets invoked when
                ifnet_start() is called; the ifnet_start_func callback will
                be executed within the context of a dedicated kernel thread,
                hence it is guaranteed to be single threaded. The driver must
                employ additional serializations if this callback routine is
                to be called directly from another context, in order to prevent
                race condition related issues (e.g. out-of-order packets.)
                The dequeued packets will be fully formed packets (including
                frame headers). The packets must be freed by the driver.
        @param interface The interface being sent on.
 */
typedef void (*ifnet_start_func)(ifnet_t interface);

/*
        @typedef ifnet_input_poll_func
        @discussion ifnet_input_poll_func is called by the network stack to
                retrieve one or more packets from the driver which implements
                the new driver input model.
        @param interface The interface to retrieve the packets from.
        @param flags For future use.
        @param max_count The maximum number of packets to be dequeued.
        @param first_packet Pointer to the first packet being dequeued.
        @param last_packet Pointer to the last packet being dequeued.
        @param cnt Pointer to a storage for the number of packets dequeued.
        @param len Pointer to a storage for the total length (in bytes)
                of the dequeued packets.
 */
typedef void (*ifnet_input_poll_func)(ifnet_t interface, u_int32_t flags,
    u_int32_t max_count, mbuf_t *first_packet, mbuf_t *last_packet,
    u_int32_t *cnt, u_int32_t *len);

/*
        @enum Interface control commands
        @abstract Constants defining control commands.
        @constant IFNET_CTL_SET_INPUT_MODEL Set input model.
        @constant IFNET_CTL_GET_INPUT_MODEL Get input model.
        @constant IFNET_CTL_SET_LOG Set logging level.
        @constant IFNET_CTL_GET_LOG Get logging level.
 */
enum {
        IFNET_CTL_SET_INPUT_MODEL       = 1,    /* input ctl */
        IFNET_CTL_GET_INPUT_MODEL       = 2,    /* input ctl */
        IFNET_CTL_SET_LOG               = 3,    /* output ctl */
        IFNET_CTL_GET_LOG               = 4,    /* output ctl */
        IFNET_CTL_NOTIFY_ADDRESS        = 5     /* output ctl */
};

/*
        @typedef ifnet_ctl_cmd_t
        @abstract Storage type for the interface control command.
 */
typedef u_int32_t ifnet_ctl_cmd_t;

/*
        @enum Interface model sub-commands
        @abstract Constants defining model sub-commands.
        @constant IFNET_MODEL_INPUT_POLL_OFF Polling is inactive.  When set,
                the network stack will no longer invoke the input_poll callback
                until the next time polling is turned on; the driver should
                proceed to pushing the packets up to the network stack as in
                the legacy input model, and if applicable, the driver should
                also enable receive interrupt for the hardware.  During get,
                this indicates that the driver is currently operating in
                the legacy/push input model.
        @constant IFNET_MODEL_INPUT_POLL_ON Polling is active.  When set, the
                network stack will begin to invoke the input_poll callback to
                retrieve packets from the driver until the next time polling
                is turned off; the driver should no longer be pushing packets
                up to the network stack, and if applicable, the driver should
                also disable receive interrupt for the hardware.  During get,
                this indicates that the driver is currently operating in
                the new/pull input model.
 */
enum {
        IFNET_MODEL_INPUT_POLL_OFF      = 0,
        IFNET_MODEL_INPUT_POLL_ON       = 1,
};

/*
        @typedef ifnet_model_t
        @abstract Storage type for the interface model sub-command.
 */
typedef u_int32_t ifnet_model_t;

/*
        @struct ifnet_model_params
        @discussion This structure is used as parameter to the ifnet model
                sub-commands.
        @field model The interface model.
 */
struct ifnet_model_params {
        ifnet_model_t           model;
        u_int32_t               reserved[3];
};

/*
        @enum Interface logging sub-commands.
        @abstract Constants defining logging levels/priorities.  A level
                includes all other levels below it.  It is expected that
                verbosity increases along with the level.
        @constant IFNET_LOG_DEFAULT Revert to default logging level.
        @constant IFNET_LOG_ALERT Log actions that must be taken immediately.
        @constant IFNET_LOG_CRITICAL Log critical conditions.
        @constant IFNET_LOG_ERROR Log error conditions.
        @constant IFNET_LOG_WARNING Log warning conditions.
        @constant IFNET_LOG_NOTICE Log normal but significant conditions.
        @constant IFNET_LOG_INFORMATIONAL Log informational messages.
        @constant IFNET_LOG_DEBUG Log debug-level messages.
 */
enum {
        IFNET_LOG_DEFAULT       = 0,
        IFNET_LOG_ALERT         = 1,
        IFNET_LOG_CRITICAL      = 2,
        IFNET_LOG_ERROR         = 3,
        IFNET_LOG_WARNING       = 4,
        IFNET_LOG_NOTICE        = 5,
        IFNET_LOG_INFORMATIONAL = 6,
        IFNET_LOG_DEBUG         = 7
};

#ifdef BSD_KERNEL_PRIVATE
#define IFNET_LOG_MIN   IFNET_LOG_DEFAULT
#define IFNET_LOG_MAX   IFNET_LOG_DEBUG
#endif /* BSD_KERNEL_PRIVATE */

/*
        @typedef ifnet_log_level_t
        @abstract Storage type for log level/priority.
 */
typedef int32_t ifnet_log_level_t;

/*
        @enum Interface logging facilities
        @abstract Constants defining the logging facilities which
                are to be configured with the specified logging level.
        @constant IFNET_LOGF_DLIL The DLIL layer.
        @constant IFNET_LOGF_FAMILY The networking family layer.
        @constant IFNET_LOGF_DRIVER The device driver layer.
        @constant IFNET_LOGF_FIRMWARE The firmware layer.
 */
enum {
        IFNET_LOGF_DLIL         = 0x00000001,
        IFNET_LOGF_FAMILY       = 0x00010000,
        IFNET_LOGF_DRIVER       = 0x01000000,
        IFNET_LOGF_FIRMWARE     = 0x10000000
};

#ifdef BSD_KERNEL_PRIVATE
#define IFNET_LOGF_MASK                                                 \
        (IFNET_LOGF_DLIL | IFNET_LOGF_FAMILY | IFNET_LOGF_DRIVER |      \
        IFNET_LOGF_FIRMWARE)

#define IFNET_LOGF_BITS \
        "\020\1DLIL\21FAMILY\31DRIVER\35FIRMWARE"

#endif /* BSD_KERNEL_PRIVATE */

/*
        @typedef ifnet_log_flags_t
        @abstract Storage type for log flags/facilities.
 */
typedef u_int32_t ifnet_log_flags_t;

/*
        @enum Interface logging category
        @abstract Constants defininig categories for issues experienced.
        @constant IFNET_LOGCAT_CONNECTIVITY Connectivity related issues.
        @constant IFNET_LOGCAT_QUALITY Quality/fidelity related issues.
        @constant IFNET_LOGCAT_PERFORMANCE Performance related issues.
 */
enum {
        IFNET_LOGCAT_CONNECTIVITY       = 1,
        IFNET_LOGCAT_QUALITY            = 2,
        IFNET_LOGCAT_PERFORMANCE        = 3
};

/*
        @typedef ifnet_log_category_t
        @abstract Storage type for log category.
 */
typedef int32_t ifnet_log_category_t;

/*
        @typedef ifnet_log_subcategory_t
        @abstract Storage type for log subcategory.  This is largely opaque
                and it can be used for IOReturn values, etc.
 */
typedef int32_t ifnet_log_subcategory_t;

/*
        @struct ifnet_log_params
        @discussion This structure is used as parameter to the ifnet
                logging sub-commands.
        @field level The logging level/priority.
        @field flags The logging flags/facilities.
        @field category The category of issue.
        @field subcategory The subcategory of issue.
 */
struct ifnet_log_params {
        ifnet_log_level_t       level;
        ifnet_log_flags_t       flags;
        ifnet_log_category_t    category;
        ifnet_log_subcategory_t subcategory;
};

/*
        @struct ifnet_notify_address_params
        @discussion This structure is used as parameter to the ifnet
                address notification sub-command.  This is used to indicate
                to the family/driver that one or more addresses of the given
                address family has been added to, or removed from the list
                of addresses on the interface.  The driver may query for the
                current address list by calling ifnet_get_address_list_family().
        @field address_family The address family of the interface address(es).
 */
struct ifnet_notify_address_params {
        sa_family_t             address_family;
        u_int32_t               reserved[3];
};

/*
        @typedef ifnet_ctl_func
        @discussion ifnet_ctl_func is called by the network stack to inform
                about changes in parameters, or retrieve the parameters
                related to the output or input processing or capabilities.
        @param interface The interface.
        @param cmd The ifnet_ctl_cmd_t interface control command.
        @param arglen The length of the command argument.
        @param arg The command argument.
        @result 0 upon success, otherwise errno error.
 */
typedef errno_t (*ifnet_ctl_func)(ifnet_t interface, ifnet_ctl_cmd_t cmd,
    u_int32_t arglen, void *arg);

/*
        @struct ifnet_init_eparams
        @discussion This structure is used to define various properties of
                the interface when calling ifnet_allocate_extended. A copy of
                these values will be stored in the ifnet and cannot be modified
                while the interface is attached.
        @field ver The current structure version (IFNET_INIT_CURRENT_VERSION)
        @field len The length of this structure.
        @field flags See above values for flags.
        @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 sndq_maxlen The maximum size of the output queue; valid only
                if IFNET_INIT_LEGACY is not set.
        @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 pre_enqueue The pre_enqueue function for the interface, valid
                only if IFNET_INIT_LEGACY is not set, and optional if it is set.
        @field start The start function for the interface, valid only if
                IFNET_INIT_LEGACY is not set, and required if it is set.
        @field output_ctl The output control function for the interface, valid
                only if IFNET_INIT_LEGACY is not set.
        @field output_sched_model The IFNET_SCHED_MODEL value for the output
                queue, as defined in net/if.h
        @field output_bw The effective output bandwidth (in bits per second.)
        @field output_bw_max The maximum theoretical output bandwidth
                (in bits per second.)
        @field output_lt The effective output latency (in nanosecond.)
        @field output_lt_max The maximum theoretical output latency
                (in nanosecond.)
        @field input_poll The poll function for the interface, valid only if
                IFNET_INIT_LEGACY is not set and only if IFNET_INIT_INPUT_POLL
                is set.
        @field input_ctl The input control function for the interface, valid
                only if IFNET_INIT_LEGACY is not set and only if opportunistic
                input polling is enabled via IFNET_INIT_INPUT_POLL flag.
        @field rcvq_maxlen The size of the driver's receive ring or the total
                count of descriptors used in the receive path; valid only if
                IFNET_INIT_INPUT_POLL is set.
        @field input_bw The effective input bandwidth (in bits per second.)
        @field input_bw_max The maximum theoretical input bandwidth
                (in bits per second.)
        @field input_lt The effective input latency (in nanosecond.)
        @field input_lt_max The maximum theoretical input latency
                (in nanosecond.)
        @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 framer_extended The function used to frame outbound packets,
                in the newer form; may be NULL.  If specified, it will override
                the value set via framer.
        @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_eparams {
        u_int32_t               ver;                    /* required */
        u_int32_t               len;                    /* required */
        u_int32_t               flags;                  /* optional */

        /* 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 */
        u_int32_t               sndq_maxlen;            /* optional, only for new model */
        ifnet_output_func       output;                 /* required only for legacy model */
        ifnet_pre_enqueue_func  pre_enqueue;            /* optional, only for new model */
        ifnet_start_func        start;                  /* required only for new model */
        ifnet_ctl_func          output_ctl;             /* optional, only for new model */
        u_int32_t               output_sched_model;     /* optional, only for new model */
        u_int32_t               reserved;               /* for future use */
        u_int64_t               output_bw;              /* optional */
        u_int64_t               output_bw_max;          /* optional */
        u_int64_t               output_lt;              /* optional */
        u_int64_t               output_lt_max;          /* optional */
        u_int64_t               _reserved[2];           /* for future use */
        ifnet_input_poll_func   input_poll;             /* optional, ignored for legacy model */
        ifnet_ctl_func          input_ctl;              /* required for opportunistic polling */
        u_int32_t               rcvq_maxlen;            /* optional, only for opportunistic polling */
        u_int32_t               __reserved;             /* for future use */
        u_int64_t               input_bw;               /* optional */
        u_int64_t               input_bw_max;           /* optional */
        u_int64_t               input_lt;               /* optional */
        u_int64_t               input_lt_max;           /* optional */
        u_int64_t               ___reserved[2];         /* for future use */
        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 */
        ifnet_framer_extended_func framer_extended;     /* optional */
        ifnet_subfamily_t       subfamily;              /* optional */
#if !defined(__LP64__)
        u_int64_t               _____reserved[3];       /* for future use */
#else
        u_int32_t               ____reserved;           /* pad */
        u_int64_t               _____reserved[2];       /* for future use */
#endif /* __LP64__ */
};
#endif /* KERNEL_PRIVATE */

/*!
        @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.
*/
#ifdef KERNEL_PRIVATE
#define demux_list demux_array
#endif /* KERNEL_PRIVATE */

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);

#ifdef KERNEL_PRIVATE
/*
        @function ifnet_allocate_extended
        @discussion An extended/newer variant of ifnet_allocate, with additional
                support for the new output and input driver models.
        @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_extended(const struct ifnet_init_eparams *init,
    ifnet_t *interface);

/*
        @function ifnet_purge
        @discussion Purge the output queue of an interface which implements
                the new driver output model.
        @param interface The interface to purge.
 */
extern void ifnet_purge(ifnet_t interface);

/*
        @function ifnet_enqueue
        @discussion Enqueue a packet to the output queue of an interface
                which implements the new driver output model.
        @param interface The interface to enqueue the packet to.
        @param packet The packet being enqueued; only one packet is allowed
                to be enqueued at a time.
        @result May return EINVAL if the parameters are invalid; ENXIO if
                the interface doesn't implement the new driver output model;
                EQFULL if the output queue is flow-controlled; or EQSUSPENDED
                if the output queue is suspended.  This routine either frees
                or consumes the packet; the caller must not modify or free
                it after calling this routine.  Any attempt to enqueue more
                than one packet will cause the entire packet chain to be freed.
 */
extern errno_t ifnet_enqueue(ifnet_t interface, mbuf_t packet);

/*
        @function ifnet_dequeue
        @discussion Dequeue a packet from the output queue of an interface
                which implements the new driver output model, and that the
                output scheduling model is set to IFNET_SCHED_MODEL_NORMAL.
        @param interface The interface to dequeue the packet from.
        @param packet Pointer to the packet being dequeued.
        @result May return EINVAL if the parameters are invalid, ENXIO if
                the interface doesn't implement the new driver output model
                or the output scheduling model isn't IFNET_SCHED_MODEL_NORMAL,
                or EAGAIN if there is currently no packet available to
                be dequeued.
 */
extern errno_t ifnet_dequeue(ifnet_t interface, mbuf_t *packet);

/*
        @function ifnet_dequeue_service_class
        @discussion Dequeue a packet of a particular service class from the
                appropriate output queue of an interface which implements the
                new driver output model, and that the output scheduling model
                is set to IFNET_SCHED_MODEL_DRIVER_MANAGED.
        @param interface The interface to dequeue the packet from.
        @param sc The service class.
        @param packet Pointer to the packet being dequeued.
        @result May return EINVAL if the parameters are invalid, ENXIO if
                the interface doesn't implement the new driver output model
                or if the output scheduling model isn't configured to
                IFNET_SCHED_MODEL_DRIVER_MANAGED, or EAGAIN if there
                is currently no packet available to be dequeued.
 */
extern errno_t ifnet_dequeue_service_class(ifnet_t interface,
    mbuf_svc_class_t sc, mbuf_t *packet);

/*
        @function ifnet_dequeue_multi
        @discussion Dequeue one or more packets from the output queue of an
                interface which implements the new driver output model, and that
                the output scheduling model is set to IFNET_SCHED_MODEL_NORMAL.
                The returned packet chain is traversable with mbuf_nextpkt().
        @param interface The interface to dequeue the packets from.
        @param max The maximum number of packets in the packet chain that
                may be returned to the caller; this needs to be a non-zero
                value for any packet to be returned.
        @param first_packet Pointer to the first packet being dequeued.
        @param last_packet Pointer to the last packet being dequeued.  Caller
                may supply NULL if not interested in value.
        @param cnt Pointer to a storage for the number of packets dequeued.
                Caller may supply NULL if not interested in value.
        @param len Pointer to a storage for the total length (in bytes)
                of the dequeued packets.  Caller may supply NULL if not
                interested in value.
        @result May return EINVAL if the parameters are invalid, ENXIO if
                the interface doesn't implement the new driver output model
                or the output scheduling model isn't IFNET_SCHED_MODEL_NORMAL,
                or EAGAIN if there is currently no packet available to
                be dequeued.
 */
extern errno_t ifnet_dequeue_multi(ifnet_t interface, u_int32_t max,
    mbuf_t *first_packet, mbuf_t *last_packet, u_int32_t *cnt, u_int32_t *len);

/*
        @function ifnet_dequeue_service_class_multi
        @discussion Dequeue one or more packets of a particular service class
                from the appropriate output queue of an interface which
                implements the new driver output model, and that the output
                scheduling model is set to IFNET_SCHED_MODEL_DRIVER_MANAGED.
                The returned packet chain is traversable with mbuf_nextpkt().
        @param interface The interface to dequeue the packets from.
        @param sc The service class.
        @param max The maximum number of packets in the packet chain that
                may be returned to the caller; this needs to be a non-zero
                value for any packet to be returned.
        @param first_packet Pointer to the first packet being dequeued.
        @param last_packet Pointer to the last packet being dequeued.  Caller
                may supply NULL if not interested in value.
        @param cnt Pointer to a storage for the number of packets dequeued.
                Caller may supply NULL if not interested in value.
        @param len Pointer to a storage for the total length (in bytes)
                of the dequeued packets.  Caller may supply NULL if not
                interested in value.
        @result May return EINVAL if the parameters are invalid, ENXIO if
                the interface doesn't implement the new driver output model
                or if the output scheduling model isn't configured to
                IFNET_SCHED_MODEL_DRIVER_MANAGED, or EAGAIN if there
                is currently no packet available to be dequeued.
 */
extern errno_t ifnet_dequeue_service_class_multi(ifnet_t interface,
    mbuf_svc_class_t sc, u_int32_t max, mbuf_t *first_packet,
    mbuf_t *last_packet, u_int32_t *cnt, u_int32_t *len);

/*
        @function ifnet_set_output_sched_model
        @discussion Set the output scheduling model of an interface which
                implements the new driver output model.
        @param interface The interface to set scheduling model on.
        @param model The IFNET_SCHED_MODEL value as defined in net/if.h
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver output model.
 */
extern errno_t ifnet_set_output_sched_model(ifnet_t interface,
    u_int32_t model);

/*
        @function ifnet_set_sndq_maxlen
        @discussion Set the maximum length of the output queue of an
                interface which implements the new driver output model.
                This call may be issued post ifnet_allocate_extended in
                order to modify the maximum output queue length previously
                set at registration time.
        @param interface The interface to set the max queue length on.
        @param maxqlen The maximum number of packets in the output queue.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver output model.
 */
extern errno_t ifnet_set_sndq_maxlen(ifnet_t interface, u_int32_t maxqlen);

/*
        @function ifnet_get_sndq_maxlen
        @discussion Get the maximum length of the output queue of an
                interface which implements the new driver output model.
        @param interface The interface to get the max queue length on.
        @param maxqlen Pointer to a storage for the maximum number of packets
                in the output queue for all service classes.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver output model.
 */
extern errno_t ifnet_get_sndq_maxlen(ifnet_t interface, u_int32_t *maxqlen);

/*
        @function ifnet_get_sndq_len
        @discussion Get the current length of the output queue of an
                interface which implements the new driver output model.
        @param interface The interface to get the current queue length on.
        @param packets Pointer to a storage for the current number of packets
                in the aggregate output queue.  This number represents all
                enqueued packets regardless of their service classes.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver output model.
 */
extern errno_t ifnet_get_sndq_len(ifnet_t interface, u_int32_t *packets);

/*
        @function ifnet_get_service_class_sndq_len
        @discussion Get the current length of the output queue for a specific
                service class of an interface which implements the new driver
                output model.
        @param interface The interface to get the current queue length on.
        @param sc The service class.
        @param packets Pointer to a storage for the current number of packets
                of the specific service class in the output queue; may be
                NULL if caller is not interested in getting the value.  Note
                that multiple service classes may be mapped to an output queue;
                this routine reports the packet count of that output queue.
        @param bytes Pointer to a storage for the current size (in bytes) of
                the output queue specific to the service class; may be NULL if
                caller is not interested in getting the value.  Note that
                multiple service classes may be mapped to an output queue;
                this routine reports the length of that output queue.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver output model.
 */
extern errno_t ifnet_get_service_class_sndq_len(ifnet_t interface,
    mbuf_svc_class_t sc, u_int32_t *packets, u_int32_t *bytes);

/*
        @function ifnet_set_rcvq_maxlen
        @discussion Set the maximum length of the input queue of an
                interface which implements the new driver input model.
                This call may be issued post ifnet_allocate_extended in
                order to modify the maximum input queue length previously
                set at registration time.
        @param interface The interface to set the max queue length on.
        @param maxqlen The maximum number of packets in the input queue.
                Drivers typically set this to the size of the receive ring
                or the total number of descriptors used for the input path.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver input model.
 */
extern errno_t ifnet_set_rcvq_maxlen(ifnet_t interface, u_int32_t maxqlen);

/*
        @function ifnet_get_rcvq_maxlen
        @discussion Get the maximum length of the input queue of an
                interface which implements the new driver input model.
        @param interface The interface to get the max queue length on.
        @param maxqlen Pointer to a storage for the maximum number of packets
                in the input queue.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver input model.
 */
extern errno_t ifnet_get_rcvq_maxlen(ifnet_t interface, u_int32_t *maxqlen);

/*
        @struct ifnet_poll_params
        @discussion This structure is used to define various opportunistic
                polling parameters for an interface.
        @field flags Currently unused/ignored; must be set to zero.
        @field packets_limit The maximum number of packets to be dequeued
                each time the driver's input poll callback is invoked while
                in polling mode; this corresponds to the max_count parameter
                of ifnet_input_poll_func.  A zero value indicates the use of
                default maximum packets defined by the system.
        @field packets_lowat Low watermark packet threshold.
        @field packets_hiwat High watermark packet threshold.
        @field bytes_lowat Low watermark packet threshold.
        @field bytes_hiwat High watermark packet threshold.
                The low and high watermark inbound packet and bytes thresholds;
                these values may be link rate dependent.  Polling is enabled
                when the average inbound packets or bytes goes above the
                corresponding high watermark value; it stays in that mode until
                both of the average inbound packets and bytes go below their
                corresponding low watermark values.  Zero watermark values
                indicates the use of default thresholds as defined by the
                system.  Both low and high watermark values must either be
                zeroes, or both must be non-zeroes with low watermark value
                being less than the high watermark value.
        @field interval_time The interval time between each invocation of
                the driver's input poll callback, in nanoseconds.  A zero
                value indicates the use of default poll interval time as
                defined by the system.  If a non-zero value is specified and
                is less than the minimum interval time, the latter will be
                chosen by the system.
 */
struct ifnet_poll_params {
        u_int32_t       flags;
        u_int32_t       packets_limit;
        u_int32_t       packets_lowat;
        u_int32_t       packets_hiwat;
        u_int32_t       bytes_lowat;
        u_int32_t       bytes_hiwat;
        u_int64_t       interval_time;
        u_int64_t       reserved[4];
};

typedef struct ifnet_poll_params ifnet_poll_params_t;

/*
        @function ifnet_set_poll_params
        @discussion Configures opportunistic input polling parameters on an
                interface.  This call may be issued post ifnet_attach in order
                to modify the interface's polling parameters.  The driver may
                alter the default values chosen by the system to achieve the
                optimal performance for a given link rate or driver dynamics.
        @param interface The interface to configure opportunistic polling on.
        @param poll_params Pointer to the polling parameters.  If NULL, it
                implies that the system should revert the interface's polling
                parameter to their default values.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver input model.
 */
extern errno_t ifnet_set_poll_params(ifnet_t interface,
    ifnet_poll_params_t *poll_params);

/*
        @function ifnet_poll_params
        @discussion Retrieves opportunistic input polling parameters on an
                interface.  This call may be issued post ifnet_attach in order
                to retrieve the interface's polling parameters.
        @param interface The interface to configure opportunistic polling on.
        @param poll_params Pointer to the polling parameters.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver input model.
 */
extern errno_t ifnet_poll_params(ifnet_t interface,
    ifnet_poll_params_t *poll_params);

/*
        @function ifnet_start
        @discussion Trigger the transmission at the driver layer on an
                interface which implements the new driver output model.
        @param interface The interface to start the transmission on.
 */
extern void ifnet_start(ifnet_t interface);

/*
        @function ifnet_transmit_burst_start
        @discussion Inform the kernel about the beginning of transmission
                of a burst.  This function should be called when a burst of
                packets are scheduled to get transmitted over the link. The
                callback will be used by the system to start measuring
                bandwidth available on that link.  The driver may choose to
                adopt this scheme for uplink bandwidth measurement, in case
                the information can't be obtained from the hardware.  Else
                it may alternatively inform the network stack about the
                information using ifnet_set_bandwidths.
        @param interface The interface.
        @param mbuf_t The first packet in a burst of packets that has been
                scheduled to transmit.
*/
extern void ifnet_transmit_burst_start(ifnet_t interface, mbuf_t pkt);

/*
        @function ifnet_transmit_burst_end
        @discussion Inform the kernel about the end of transmission of a burst.
                This function should be called when the transmission of a burst
                of packets is done. This information will be used by the
                system to estimate bandwidth available on that link.  The
                driver may choose to adopt this scheme for uplink bandwidth
                measurement, in case the information can't be obtained from
                the hardware.  Else it may alternatively inform the network
                stack about the information using ifnet_set_bandwidths.
        @param interface The interface.
        @param mbuf_t The last packet in the burst that has been successfully
                transmitted.
*/
extern void ifnet_transmit_burst_end(ifnet_t interface, mbuf_t pkt);

/*
        @function ifnet_flowid
        @discussion Returns the interface flow ID value, which can be used
                by a (virtual) network interface for participating in the
                FLOWSRC_IFNET flow advisory mechanism.  The flow ID value
                is available after the interface is attached.
        @param interface The interface to retrieve the flow ID from.
        @param flowid Pointer to the flow ID value.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver input model.
 */
extern errno_t ifnet_flowid(ifnet_t interface, u_int32_t *flowid);

/*
        @function ifnet_enable_output
        @discussion Enables output on a (virtual) interface if it has been
                previously disabled via ifnet_disable_output().  This call
                is used to override the flow advisory mechanism typically
                used between a (virtual) network interface and a real network
                interface beneath it.  Under normal circumstances, the flow
                advisory mechanism will automatically re-enable the (virtual)
                interface's output mechanism when the real network interface
                is able to transmit more data.  Re-enabling output will cause
                the (virtual) interface's start callback to be called again.
        @param interface The interface to enable the transmission on.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver input model.
 */
extern errno_t ifnet_enable_output(ifnet_t interface);

/*
        @function ifnet_disable_output
        @discussion Disables output on a (virtual) interface.  Disabling
                output will cause the (virtual) interface's start callback
                to go idle.  This call is typically used by a (virtual)
                interface upon receiving flow control feedbacks from the
                real network interface beneath it, in order propagate the
                flow control condition to the layers above.  Under normal
                circumstances, the flow advisory mechanism will automatically
                re-enable the (virtual) interface's output mechanism when
                the real network interface is able to transmit more data,
                as long as the (virtual) interface participates in the
                FLOWSRC_IFNET flow advisory for the data that it emits.
        @param interface The interface to disable the transmission on.
        @result May return EINVAL if the parameters are invalid or ENXIO if
                the interface doesn't implement the new driver input model.
 */
extern errno_t ifnet_disable_output(ifnet_t interface);
#endif /* KERNEL_PRIVATE */

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*
 * 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);

/*!
        @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);

/*!
        @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);

#ifdef KERNEL_PRIVATE
/*
        @function ifnet_subfamily
        @discussion Returns the sub-family of the interface.
        @param interface Interface to retrieve the sub-family from.
        @result Interface sub-family type.
 */
extern ifnet_subfamily_t ifnet_subfamily(ifnet_t interface);
#endif /* KERNEL_PRIVATE */

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);


#ifdef KERNEL_PRIVATE
/*
        @function ifnet_set_eflags
        @discussion Sets the extended 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 extended flags to (if_eflags & ~mask) |
                (new_flags & mask).
        @param interface The interface.
        @param new_flags The new set of flags that should be set. These
                flags are defined in net/if.h
        @param mask The mask of flags to be modified.
        @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_eflags(ifnet_t interface, u_int32_t new_flags,
    u_int32_t mask);

/*
        @function ifnet_eflags
        @discussion Returns the extended interface flags that are set.
        @param interface Interface to retrieve the flags from.
        @result Extended flags. These flags are defined in net/if.h
 */
extern u_int32_t ifnet_eflags(ifnet_t interface);

/*
        @function ifnet_set_idle_flags
        @discussion Sets the if_idle_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 idle flags to:
                        (if_idle_flags & ~mask) | (new_flags & mask).
                Setting the flags to any non-zero value will cause the
                networking stack to aggressively purge expired objects,
                such as route entries, etc.
        @param interface The interface.
        @param new_flags The new set of flags that should be set. These
                flags are defined in net/if.h
        @param mask The mask of flags to be modified.
        @result 0 on success otherwise the errno error.  ENOTSUP is returned
                when this call is made on non-supporting platforms.
*/
extern errno_t ifnet_set_idle_flags(ifnet_t interface, u_int32_t new_flags,
    u_int32_t mask);

/*
        @function ifnet_idle_flags
        @discussion Returns the value of if_idle_flags.
        @param interface Interface to retrieve the flags from.
        @result if_idle_flags. These flags are defined in net/if.h
*/
extern u_int32_t ifnet_idle_flags(ifnet_t interface);

/*
        @function ifnet_set_link_quality
        @discussion Sets the Link Quality Metric for the ifnet.
        @param interface Interface for which the Link Quality Metric should
                be associated to.
        @param quality IFNET_LQM value as defined in net/if.h.
        @result 0 on success otherwise the errno error.  EINVAL if quality
                is not a valid value.  ENXIO if the interface is not attached.
*/
extern errno_t ifnet_set_link_quality(ifnet_t interface, int quality);

/*
        @function ifnet_link_quality
        @discussion Returns the Link Quality Metric for the ifnet.
        @param interface Interface to retrieve the value from.
        @result IFNET_LQM as defined in net/if.h
*/
extern int ifnet_link_quality(ifnet_t interface);

/*
        @struct ifnet_llreach_info
        @discussion This structure is used to describe the link-layer
                reachability information of an on-link node.
        @field iflri_refcnt The number of network-layer objects referring
                to this link-layer reachability record.
        @field iflri_probes The total number of outstanding probes.
        @field iflri_snd_expire The send expiration time.  This is calculated
                based on the last time the system transmitted a packet to the
                node.  A zero value indicates that a packet has not been sent
                to the node.  A non-zero value indicates the time before the
                record is determined to be invalid.  When the record is no
                longer valid, the system will send probe(s) to resolve the
                node again.  This value is relative to the current time
                specified in iflri_curtime.
        @field iflri_rcv_expire The receive expiriation time.  This is
                calculated based on the last time the system received a packet
                from the node.  A zero value indicates that a packet has not
                been received from the node.  A non-zero value indicates the
                time before the record is determined to be invalid.  When the
                record is no longer valid, the system will send probe(s) to
                resolve the node again.  This value is relative to the current
                time specified in iflri_curtime.
        @field iflri_curtime The current time when this record was retrieved.
        @field iflri_netproto The protocol number of the network-layer object.
        @field iflri_addr The link-layer address of the node.
        @field iflri_rssi The received signal strength indication (RSSI) of the
                node in dBm.  The special value IFNET_RSSI_UNKNOWN is used when
                the RSSI is either unknown or inapplicable for the interface.
        @field iflri_lqm The link quality metric (LQM) to the node.  The
                special value IFNET_LQM_UNKNOWN is used when the LQM is not
                currently known.  The special value IFNET_LQM_OFF is used when
                the link quality metric is inapplicable to nodes at this
                attached to the network at this interface.
        @field iflri_npm The node proximity metric (NPM) to the node.  The
                special value IFNET_NPM_UNKNOWN is used when the NPM is not
                currently known.
 */
#define IFNET_LLREACHINFO_ADDRLEN       64      /* max ll addr len */

struct ifnet_llreach_info {
        u_int32_t iflri_refcnt;
        u_int32_t iflri_probes;
        u_int64_t iflri_snd_expire;
        u_int64_t iflri_rcv_expire;
        u_int64_t iflri_curtime;
        u_int32_t iflri_netproto;
        u_int8_t  iflri_addr[IFNET_LLREACHINFO_ADDRLEN];
        int32_t   iflri_rssi;
        int32_t   iflri_lqm;
        int32_t   iflri_npm;
};

/*
        @function ifnet_inet_defrouter_llreachinfo
        @discussion Retrieve link-layer reachability information of the
                default IPv4 router specific to the interface.
        @param interface The interface associated with the default IPv4 router.
        @param pinfo Pointer to the ifnet_llreach_info structure where the
                information will be returned to, upon success.
        @result 0 upon success, otherwise errno error.
 */
extern errno_t ifnet_inet_defrouter_llreachinfo(ifnet_t interface,
    struct ifnet_llreach_info *pinfo);

/*
        @function ifnet_inet6_defrouter_llreachinfo
        @discussion Retrieve link-layer reachability information of the
                default IPv6 router specific to the interface.
        @param interface The interface associated with the default IPv6 router.
        @param pinfo Pointer to the ifnet_llreach_info structure where the
                information will be returned to, upon success.
        @result 0 upon success, otherwise errno error.
 */
extern errno_t ifnet_inet6_defrouter_llreachinfo(ifnet_t interface,
    struct ifnet_llreach_info *pinfo);
#endif /* KERNEL_PRIVATE */

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);


/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

#ifdef KERNEL_PRIVATE
/*
        @function ifnet_input_extended
        @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 last_packet The last packet in a chain of packets.  This may be
                set to NULL if the driver does not have the information.
        @param stats Counts to be integrated in to the stats. The interface
                statistics will be incremented by the amounts specified in
                stats. Unlike ifnet_input(), this parameter is required by
                this extended variant.
        @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_input_extended(ifnet_t interface, mbuf_t first_packet,
    mbuf_t last_packet, const struct ifnet_stat_increment_param *stats);
#endif /* KERNEL_PRIVATE */

/*!
        @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);

/*!
        @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);

/*!
        @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);

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

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

/*!
        @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);

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

/*!
        @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);

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

/*!
        @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);

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

/*!
        @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);

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

#ifdef KERNEL_PRIVATE
typedef struct if_bandwidths if_bandwidths_t;

/*
        @function ifnet_set_bandwidths
        @discussion This function allows a driver to indicate the output
                and/or input bandwidth information to the system.  Each set
                is comprised of the effective and maximum theoretical values.
                Each value must be greater than zero.
        @param interface The interface.
        @param output_bw The output bandwidth values (in bits per second).
                May be set to NULL if the caller does not want to alter the
                existing output bandwidth values.
        @param input_bw The input bandwidth values (in bits per second).
                May be set to NULL if the caller does not want to alter the
                existing input bandwidth values.
        @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_bandwidths(ifnet_t interface,
    if_bandwidths_t *output_bw, if_bandwidths_t *input_bw);

/*
        @function ifnet_bandwidths
        @param interface The interface.
        @param output_bw The output bandwidth values (in bits per second).
                May be set to NULL if the caller does not want to retrieve the
                output bandwidth value.
        @param input_bw The input bandwidth values (in bits per second).
                May be set to NULL if the caller does not want to retrieve the
                input bandwidth value.
        @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_bandwidths(ifnet_t interface, if_bandwidths_t *output_bw,
    if_bandwidths_t *input_bw);

typedef struct if_latencies if_latencies_t;

/*
        @function ifnet_set_latencies
        @discussion This function allows a driver to indicate the output
                and/or input latency information to the system.  Each set
                is comprised of the effective and maximum theoretical values.
                Each value must be greater than zero.
        @param interface The interface.
        @param output_lt The output latency values (in nanosecond).
                May be set to NULL if the caller does not want to alter the
                existing output latency values.
        @param input_lt The input latency values (in nanosecond).
                May be set to NULL if the caller does not want to alter the
                existing input latency values.
        @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_set_latencies(ifnet_t interface,
    if_latencies_t *output_lt, if_latencies_t *input_lt);

/*
        @function ifnet_latencies
        @param interface The interface.
        @param output_lt The output latency values (in nanosecond).
                May be set to NULL if the caller does not want to retrieve the
                output latency value.
        @param input_lt The input latency values (in nanosecond).
                May be set to NULL if the caller does not want to retrieve the
                input latency value.
        @result 0 on success otherwise the errno error.
 */
extern errno_t ifnet_latencies(ifnet_t interface, if_latencies_t *output_lt,
    if_latencies_t *input_lt);
#endif /* KERNEL_PRIVATE */

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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 counts 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);

/*!
        @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);

/*!
        @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 requrest, 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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

#ifdef KERNEL_PRIVATE
/*!
        @function ifnet_get_inuse_address_list
        @discussion Get a list of addresses on the interface that are in
        use by atleast one TCP or UDP socket. The rest of the API is similar
        to ifnet_get_address_list. Calling ifnet_free_address_list will
        free the array of addresses. Note this only gives a point in time
        snapshot of the addresses in use.
        @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_inuse_address_list(ifnet_t interface,
    ifaddr_t **addresses);

__private_extern__ errno_t ifnet_get_address_list_family_internal(ifnet_t,
    ifaddr_t **, sa_family_t, int, int, int);
#endif /* KERNEL_PRIVATE */

/*!
        @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);

/*!
        @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);

/*!
        @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);

#ifdef KERNEL_PRIVATE
/*!
        @function ifnet_guarded_lladdr_copy_bytes
        @discussion Copies the bytes of the link-layer address into the
                specified buffer unless the current process is a sandboxed
                application without the net.link.addr system info privilege.
        @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_guarded_lladdr_copy_bytes(ifnet_t interface, void *lladdr,
    size_t length);

/*!
        @function ifnet_lladdr
        @discussion Returns a pointer to the link-layer address.
        @param interface The interface the link-layer address is on.
 */
extern void *ifnet_lladdr(ifnet_t interface);
#endif /* KERNEL_PRIVATE */

/*!
        @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 addr_len On return, the length of the broadcast address.
        @param lladdr_len The length, in bytes, of the link layer address.
 */
extern errno_t ifnet_llbroadcast_copy_bytes(ifnet_t interface, void *addr,
    size_t bufferlen, size_t *addr_len);

#ifdef KERNEL_PRIVATE
/*!
        @function ifnet_set_lladdr_and_type
        @discussion Sets the link-layer address as well as the type field in
                the sockaddr_dl. Support for setting the type was added for vlan
                and bond interfaces.
        @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.
        @param type The link-layer address type.
 */
extern errno_t ifnet_set_lladdr_and_type(ifnet_t interface, const void *lladdr,
    size_t length, u_char type);
#endif /* KERNEL_PRIVATE */

/*!
        @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 interface 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);

/*!
        @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);

/*!
        @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);

/*!
        @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 multicasts 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);

/*!
        @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.
        @result 0 on success otherwise the errno error.
 */
extern void ifnet_free_multicast_list(ifmultiaddr_t *multicasts);

/*!
        @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 name 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);

/*!
        @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);

#ifdef KERNEL_PRIVATE
/*!
        @function ifnet_list_get_all
        @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.  This is similar to ifnet_list_get, except
                that it includes interfaces that are detaching.
        @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_all(ifnet_family_t family, ifnet_t **interfaces,
    u_int32_t *count);
#endif /* KERNEL_PRIVATE */

/*!
        @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);

/******************************************************************************/
/* 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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/******************************************************************************/
/* 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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

/*!
        @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);

#ifdef KERNEL_PRIVATE
/******************************************************************************/
/* interface cloner                                                           */
/******************************************************************************/

/*
        @typedef ifnet_clone_create_func
        @discussion ifnet_clone_create_func is called to create an interface.
        @param ifcloner The interface cloner.
        @param unit The interface unit number to create.
        @param params Additional information specific to the interface cloner.
        @result Return zero on success or an errno error value on failure.
 */
typedef errno_t (*ifnet_clone_create_func)(if_clone_t ifcloner, u_int32_t unit, void *params);

/*
        @typedef ifnet_clone_destroy_func
        @discussion ifnet_clone_create_func is called to destroy an interface created
                by an interface cloner.
        @param interface The interface to destroy.
        @result Return zero on success or an errno error value on failure.
 */
typedef errno_t (*ifnet_clone_destroy_func)(ifnet_t interface);

/*
        @struct ifnet_clone_params
        @discussion This structure is used to represent an interface cloner.
        @field ifc_name The interface name handled by this interface cloner.
        @field ifc_create The function to create an interface.
        @field ifc_destroy The function to destroy an interface.
*/
struct ifnet_clone_params {
        const char                                      *ifc_name;
        ifnet_clone_create_func         ifc_create;
        ifnet_clone_destroy_func        ifc_destroy;
};

/*
        @function ifnet_clone_attach
        @discussion Attaches a new interface cloner.
        @param cloner_params The structure that defines an interface cloner.
        @param interface A pointer to an opaque handle that represent the interface cloner
                that is attached upon success.
        @result Returns 0 on success.
                May return ENOBUFS if there is insufficient memory.
                May return EEXIST if an interface cloner with the same name is already attached.
 */
extern errno_t ifnet_clone_attach(struct ifnet_clone_params *cloner_params, if_clone_t *ifcloner);

/*
        @function ifnet_clone_detach
        @discussion Detaches a previously attached interface cloner.
        @param ifcloner The opaque handle returned when the interface cloner was attached.
        @result Returns 0 on success.
 */
extern errno_t ifnet_clone_detach(if_clone_t ifcloner);

/******************************************************************************/
/* misc                                                                       */
/******************************************************************************/

/*
        @function ifnet_get_local_ports
        @discussion Returns a bitfield indicating which ports of PF_INET
                and PF_INET6 protocol families have sockets in the usable
                state.  An interface that supports waking the host on unicast
                traffic may use this information to discard incoming unicast
                packets that don't have a corresponding bit set instead of
                waking up the host. For port 0x0001, bit 1 of the first byte
                would be set. For port n, bit 1 << (n % 8) of the (n / 8)'th
                byte would be set.
        @param ifp The interface in question.  May be NULL, which means
                all interfaces.
        @param bitfield A pointer to 8192 bytes.
        @result Returns 0 on success.
 */
extern errno_t ifnet_get_local_ports(ifnet_t ifp, u_int8_t *bitfield);

/*
        @function ifnet_get_local_ports_extended
        @discussion Returns a bitfield indicating which local ports of the
                specified protocol have sockets in the usable state.  An
                interface that supports waking the host on unicast traffic may
                use this information to discard incoming unicast packets that
                don't have a corresponding bit set instead of waking up the
                host.  For port 0x0001, bit 1 of the first byte would be set.
                For port n, bit 1 << (n % 8) of the (n / 8)'th byte would be
                set.
        @param ifp The interface in question.  May be NULL, which means
                all interfaces.
        @param protocol The protocol family of the sockets.  PF_UNSPEC (0)
                means all protocols, otherwise PF_INET or PF_INET6.
        @param wildcardok A boolean value (0 or 1) indicating whether or not
                the list of local ports should include those that are used
                by sockets that aren't bound to any local address.
        @param bitfield A pointer to 8192 bytes.
        @result Returns 0 on success.
 */
extern errno_t ifnet_get_local_ports_extended(ifnet_t ifp,
    protocol_family_t protocol, u_int32_t wildcardok, u_int8_t *bitfield);

/******************************************************************************/
/* for reporting issues                                                       */
/******************************************************************************/

#define IFNET_MODIDLEN  20
#define IFNET_MODARGLEN 12

/*
        @function ifnet_report_issues
        @discussion Provided for network interface families and drivers to
                notify the system of issues detected at their layers.
        @param ifp The interface experiencing issues.
        @param modid The ID of the module reporting issues.  It may contain
                any value that is unique enough to identify the module, such
                as the SHA-1 hash of the bundle ID of the module, e.g.
                "com.apple.iokit.IONetworkingFamily" or
                "com.apple.iokit.IO80211Family".
        @param info An optional, fixed-size array of octets containing opaque
                information data used specific to the module/layer reporting
                the issues.  May be NULL.
        @result Returns 0 on success, or EINVAL if arguments are invalid.
 */
extern errno_t ifnet_report_issues(ifnet_t ifp, u_int8_t modid[IFNET_MODIDLEN],
    u_int8_t info[IFNET_MODARGLEN]);

/******************************************************************************/
/* for interfaces that support link level transmit completion status          */
/******************************************************************************/
/*
        @enum  Per packet phy level transmit completion status values
        @abstract Constants defining possible completion status values
        A driver may support all or some of these values
        @constant IFNET_TX_COMPL_SUCCESS  link transmission succeeded
        @constant IFNET_TX_COMPL_FAIL     link transmission failed
        @constant IFNET_TX_COMPL_ABORTED  link transmission aborted, may retry
        @constant IFNET_TX_QUEUE_FULL     link level secondary queue full
*/
enum {
        IFNET_TX_COMPL_SUCCESS          = 0,    /* sent on link */
        IFNET_TX_COMPL_FAIL             = 1,    /* failed to send on link */
        IFNET_TX_COMPL_ABORTED          = 2,    /* aborted send, peer asleep */
        IFNET_TX_COMPL_QFULL            = 3     /* driver level queue full */
};

typedef u_int32_t       tx_compl_val_t;

/*
        @function ifnet_tx_compl_status
        @discussion Used as an upcall from IONetwork Family to stack that
                indicates the link level completion status of a transmitted
                packet.
        @param ifp The interface to which the mbuf was sent
        @param m The mbuf that was transmitted
        @param val indicates the status of the transmission
*/
extern errno_t ifnet_tx_compl_status(ifnet_t ifp, mbuf_t m, tx_compl_val_t val);

/******************************************************************************/
/* for interfaces that support dynamic node absence/presence events           */
/******************************************************************************/

/*
        @function ifnet_notice_node_presence
        @discussion Provided for network interface drivers to notify the
                system of a change detected in the presence of the specified
                node.
        @param ifp The interface attached to the link where the specified node
                is present.
        @param sa The AF_LINK family address of the node whose presence is
                changing.
        @param rssi The received signal strength indication as measured in
                dBm by a radio receiver.
        @param lqm A link quality metric associated with the specified node.
        @param npm A node proximity metric associated with the specified node.
        @param srvinfo A fixed-size array of octets containing opaque service
                information data used by the mDNS responder subsystem.
        @result Returns 0 on success, or EINVAL if arguments are invalid.
 */
extern errno_t
ifnet_notice_node_presence(ifnet_t ifp, struct sockaddr *sa, int32_t rssi,
    int lqm, int npm, u_int8_t srvinfo[48]);

/*
        @function ifnet_notice_node_absence
        @discussion Provided for network interface drivers to notify the
                system that the absence of the specified node has been detected.
        @param ifp The interface attached to the link where the absence of the
                specified node has been detected.
        @param sa The AF_LINK family address of the node whose absence has been
                detected.
        @result Returns 0 on success, or EINVAL if arguments are invalid.
 */
extern errno_t ifnet_notice_node_absence(ifnet_t ifp, struct sockaddr *sa);

/*
        @function ifnet_notice_master_elected
        @discussion Provided for network interface drivers to notify the system
                that the nodes with a locally detected presence on the attached
                link have elected a new master.
        @param ifp The interface attached to the link where the new master has
                been elected.
        @result Returns 0 on success, or EINVAL if arguments are invalid.
 */
extern errno_t ifnet_notice_master_elected(ifnet_t ifp);

/******************************************************************************/
/* for interface delegation                                                   */
/******************************************************************************/

/*
        @function ifnet_set_delegate
        @discussion Indicate that an interface is delegating another interface
                for accounting/restriction purposes.  This could be used by a
                virtual interface that is going over another interface, where
                the virtual interface is to be treated as if it's the underlying
                interface for certain operations/checks.
        @param ifp The delegating interface.
        @param delegated_ifp The delegated interface.  If NULL or equal to
                the delegating interface itself, any previously-established
                delegation is removed.  If non-NULL, a reference to the
                delegated interface is held by the delegating interface;
                this reference is released via a subsequent call to remove
                the established association, or when the delegating interface
                is detached.
        @param Returns 0 on success, EINVAL if arguments are invalid, or
                ENXIO if the delegating interface isn't currently attached.
 */
extern errno_t
ifnet_set_delegate(ifnet_t ifp, ifnet_t delegated_ifp);

/*
        @function ifnet_get_delegate
        @discussion Retrieve delegated interface information on an interface.
        @param ifp The delegating interface.
        @param pdelegated_ifp Pointer to the delegated interface.  Upon
                success, this will contain the delegated interface or
                NULL if there is no delegation in place.  If non-NULL,
                the delegated interface will be returned with a reference
                held for caller, and the caller is responsible for releasing
                it via ifnet_release();
        @param Returns 0 on success, EINVAL if arguments are invalid, or
                ENXIO if the delegating interface isn't currently attached.
 */
extern errno_t
ifnet_get_delegate(ifnet_t ifp, ifnet_t *pdelegated_ifp);
#endif /* KERNEL_PRIVATE */

__END_DECLS

#endif /* __KPI_INTERFACE__ */