FreeBSD/Linux Kernel Cross Reference
sys/net/if_var.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1982, 1986, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      From: @(#)if.h  8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    #ifndef _NET_IF_VAR_H_
    #define _NET_IF_VAR_H_
    
    /*
     * Structures defining a network interface, providing a packet
     * transport mechanism (ala level 0 of the PUP protocols).
     *
     * Each interface accepts output datagrams of a specified maximum
     * length, and provides higher level routines with input datagrams
     * received from its medium.
     *
     * Output occurs when the routine if_output is called, with three parameters:
     *      (*ifp->if_output)(ifp, m, dst, ro)
     * Here m is the mbuf chain to be sent and dst is the destination address.
     * The output routine encapsulates the supplied datagram if necessary,
     * and then transmits it on its medium.
     *
     * On input, each interface unwraps the data received by it, and either
     * places it on the input queue of an internetwork datagram routine
     * and posts the associated software interrupt, or passes the datagram to a raw
     * packet input routine.
     *
     * Routines exist for locating interfaces by their addresses
     * or for locating an interface on a certain network, as well as more general
     * routing and gateway routines maintaining information used to locate
     * interfaces.  These routines live in the files if.c and route.c
     */
    
    struct  rtentry;                /* ifa_rtrequest */
    struct  socket;
    struct  carp_if;
    struct  carp_softc;
    struct  ifvlantrunk;
    struct  route;                  /* if_output */
    struct  vnet;
    struct  ifmedia;
    struct  netmap_adapter;
    struct  debugnet_methods;
    
    #ifdef _KERNEL
    #include <sys/_eventhandler.h>
    #include <sys/mbuf.h>           /* ifqueue only? */
    #include <sys/buf_ring.h>
    #include <net/vnet.h>
    #endif /* _KERNEL */
    #include <sys/ck.h>
    #include <sys/counter.h>
    #include <sys/epoch.h>
    #include <sys/lock.h>           /* XXX */
    #include <sys/mutex.h>          /* struct ifqueue */
    #include <sys/rwlock.h>         /* XXX */
    #include <sys/sx.h>             /* XXX */
    #include <sys/_task.h>          /* if_link_task */
    #define IF_DUNIT_NONE   -1
    
    #include <net/altq/if_altq.h>
    
    CK_STAILQ_HEAD(ifnethead, ifnet);       /* we use TAILQs so that the order of */
    CK_STAILQ_HEAD(ifaddrhead, ifaddr);     /* instantiation is preserved in the list */
    CK_STAILQ_HEAD(ifmultihead, ifmultiaddr);
    CK_STAILQ_HEAD(ifgrouphead, ifg_group);
    
    #ifdef _KERNEL
    VNET_DECLARE(struct pfil_head *, link_pfil_head);
    #define V_link_pfil_head        VNET(link_pfil_head)
   #define PFIL_ETHER_NAME         "ethernet"
   
   #define HHOOK_IPSEC_INET        0
   #define HHOOK_IPSEC_INET6       1
   #define HHOOK_IPSEC_COUNT       2
   VNET_DECLARE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]);
   VNET_DECLARE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]);
   #define V_ipsec_hhh_in  VNET(ipsec_hhh_in)
   #define V_ipsec_hhh_out VNET(ipsec_hhh_out)
   #endif /* _KERNEL */
   
   typedef enum {
           IFCOUNTER_IPACKETS = 0,
           IFCOUNTER_IERRORS,
           IFCOUNTER_OPACKETS,
           IFCOUNTER_OERRORS,
           IFCOUNTER_COLLISIONS,
           IFCOUNTER_IBYTES,
           IFCOUNTER_OBYTES,
           IFCOUNTER_IMCASTS,
           IFCOUNTER_OMCASTS,
           IFCOUNTER_IQDROPS,
           IFCOUNTER_OQDROPS,
           IFCOUNTER_NOPROTO,
           IFCOUNTERS /* Array size. */
   } ift_counter;
   
   typedef void (*if_start_fn_t)(if_t);
   typedef int (*if_ioctl_fn_t)(if_t, u_long, caddr_t);
   typedef void (*if_init_fn_t)(void *);
   typedef void (*if_input_fn_t)(struct ifnet *, struct mbuf *);
   typedef int (*if_output_fn_t)
       (struct ifnet *, struct mbuf *, const struct sockaddr *, struct route *);
   typedef void (*if_qflush_fn_t)(if_t);
   typedef int (*if_transmit_fn_t)(if_t, struct mbuf *);
   typedef uint64_t (*if_get_counter_t)(if_t, ift_counter);
   
   struct ifnet_hw_tsomax {
           u_int   tsomaxbytes;    /* TSO total burst length limit in bytes */
           u_int   tsomaxsegcount; /* TSO maximum segment count */
           u_int   tsomaxsegsize;  /* TSO maximum segment size in bytes */
   };
   
   /* Interface encap request types */
   typedef enum {
           IFENCAP_LL = 1                  /* pre-calculate link-layer header */
   } ife_type;
   
   /*
    * The structure below allows to request various pre-calculated L2/L3 headers
    * for different media. Requests varies by type (rtype field).
    *
    * IFENCAP_LL type: pre-calculates link header based on address family
    *   and destination lladdr.
    *
    *   Input data fields:
    *     buf: pointer to destination buffer
    *     bufsize: buffer size
    *     flags: IFENCAP_FLAG_BROADCAST if destination is broadcast
    *     family: address family defined by AF_ constant.
    *     lladdr: pointer to link-layer address
    *     lladdr_len: length of link-layer address
    *     hdata: pointer to L3 header (optional, used for ARP requests).
    *   Output data fields:
    *     buf: encap data is stored here
    *     bufsize: resulting encap length is stored here
    *     lladdr_off: offset of link-layer address from encap hdr start
    *     hdata: L3 header may be altered if necessary
    */
   
   struct if_encap_req {
           u_char          *buf;           /* Destination buffer (w) */
           size_t          bufsize;        /* size of provided buffer (r) */
           ife_type        rtype;          /* request type (r) */
           uint32_t        flags;          /* Request flags (r) */
           int             family;         /* Address family AF_* (r) */
           int             lladdr_off;     /* offset from header start (w) */
           int             lladdr_len;     /* lladdr length (r) */
           char            *lladdr;        /* link-level address pointer (r) */
           char            *hdata;         /* Upper layer header data (rw) */
   };
   
   #define IFENCAP_FLAG_BROADCAST  0x02    /* Destination is broadcast */
   
   /*
    * Network interface send tag support. The storage of "struct
    * m_snd_tag" comes from the network driver and it is free to allocate
    * as much additional space as it wants for its own use.
    */
   struct ktls_session;
   struct m_snd_tag;
   
   #define IF_SND_TAG_TYPE_RATE_LIMIT 0
   #define IF_SND_TAG_TYPE_UNLIMITED 1
   #define IF_SND_TAG_TYPE_TLS 2
   #define IF_SND_TAG_TYPE_TLS_RATE_LIMIT 3
   #define IF_SND_TAG_TYPE_TLS_RX 4
   #define IF_SND_TAG_TYPE_MAX 5
   
   struct if_snd_tag_alloc_header {
           uint32_t type;          /* send tag type, see IF_SND_TAG_XXX */
           uint32_t flowid;        /* mbuf hash value */
           uint32_t flowtype;      /* mbuf hash type */
           uint8_t numa_domain;    /* numa domain of associated inp */
   };
   
   struct if_snd_tag_alloc_rate_limit {
           struct if_snd_tag_alloc_header hdr;
           uint64_t max_rate;      /* in bytes/s */
           uint32_t flags;         /* M_NOWAIT or M_WAITOK */
           uint32_t reserved;      /* alignment */
   };
   
   struct if_snd_tag_alloc_tls {
           struct if_snd_tag_alloc_header hdr;
           struct inpcb *inp;
           const struct ktls_session *tls;
   };
   
   struct if_snd_tag_alloc_tls_rx {
           struct if_snd_tag_alloc_header hdr;
           struct inpcb *inp;
           const struct ktls_session *tls;
           uint16_t vlan_id;       /* valid if non-zero */
   };
   
   struct if_snd_tag_alloc_tls_rate_limit {
           struct if_snd_tag_alloc_header hdr;
           struct inpcb *inp;
           const struct ktls_session *tls;
           uint64_t max_rate;      /* in bytes/s */
   };
   
   struct if_snd_tag_rate_limit_params {
           uint64_t max_rate;      /* in bytes/s */
           uint32_t queue_level;   /* 0 (empty) .. 65535 (full) */
   #define IF_SND_QUEUE_LEVEL_MIN 0
   #define IF_SND_QUEUE_LEVEL_MAX 65535
           uint32_t flags;         /* M_NOWAIT or M_WAITOK */
   };
   
   struct if_snd_tag_modify_tls_rx {
           /* TCP sequence number of TLS header in host endian format */
           uint32_t tls_hdr_tcp_sn;
   
           /*
            * TLS record length, including all headers, data and trailers.
            * If the tls_rec_length is zero, it means HW encryption resumed.
            */
           uint32_t tls_rec_length;
   
           /* TLS sequence number in host endian format */
           uint64_t tls_seq_number;
   };
   
   union if_snd_tag_alloc_params {
           struct if_snd_tag_alloc_header hdr;
           struct if_snd_tag_alloc_rate_limit rate_limit;
           struct if_snd_tag_alloc_rate_limit unlimited;
           struct if_snd_tag_alloc_tls tls;
           struct if_snd_tag_alloc_tls_rx tls_rx;
           struct if_snd_tag_alloc_tls_rate_limit tls_rate_limit;
   };
   
   union if_snd_tag_modify_params {
           struct if_snd_tag_rate_limit_params rate_limit;
           struct if_snd_tag_rate_limit_params unlimited;
           struct if_snd_tag_rate_limit_params tls_rate_limit;
           struct if_snd_tag_modify_tls_rx tls_rx;
   };
   
   union if_snd_tag_query_params {
           struct if_snd_tag_rate_limit_params rate_limit;
           struct if_snd_tag_rate_limit_params unlimited;
           struct if_snd_tag_rate_limit_params tls_rate_limit;
   };
   
   typedef int (if_snd_tag_alloc_t)(struct ifnet *, union if_snd_tag_alloc_params *,
       struct m_snd_tag **);
   typedef int (if_snd_tag_modify_t)(struct m_snd_tag *, union if_snd_tag_modify_params *);
   typedef int (if_snd_tag_query_t)(struct m_snd_tag *, union if_snd_tag_query_params *);
   typedef void (if_snd_tag_free_t)(struct m_snd_tag *);
   typedef struct m_snd_tag *(if_next_send_tag_t)(struct m_snd_tag *);
   
   struct if_snd_tag_sw {
           if_snd_tag_modify_t *snd_tag_modify;
           if_snd_tag_query_t *snd_tag_query;
           if_snd_tag_free_t *snd_tag_free;
           if_next_send_tag_t *next_snd_tag;
           u_int   type;                   /* One of IF_SND_TAG_TYPE_*. */
   };
   
   /* Query return flags */
   #define RT_NOSUPPORT      0x00000000    /* Not supported */
   #define RT_IS_INDIRECT    0x00000001    /*
                                            * Interface like a lagg, select
                                            * the actual interface for
                                            * capabilities.
                                            */
   #define RT_IS_SELECTABLE  0x00000002    /*
                                            * No rate table, you select
                                            * rates and the first
                                            * number_of_rates are created.
                                            */
   #define RT_IS_FIXED_TABLE 0x00000004    /* A fixed table is attached */
   #define RT_IS_UNUSABLE    0x00000008    /* It is not usable for this */
   #define RT_IS_SETUP_REQ   0x00000010    /* The interface setup must be called before use */
   
   struct if_ratelimit_query_results {
           const uint64_t *rate_table;     /* Pointer to table if present */
           uint32_t flags;                 /* Flags indicating results */
           uint32_t max_flows;             /* Max flows using, 0=unlimited */
           uint32_t number_of_rates;       /* How many unique rates can be created */
           uint32_t min_segment_burst;     /* The amount the adapter bursts at each send */
   };
   
   typedef void (if_ratelimit_query_t)(struct ifnet *,
       struct if_ratelimit_query_results *);
   typedef int (if_ratelimit_setup_t)(struct ifnet *, uint64_t, uint32_t);
   #define IF_NODOM        255
   /*
    * Locks for address lists on the network interface.
    */
   #define IF_ADDR_LOCK_INIT(if)   mtx_init(&(if)->if_addr_lock, "if_addr_lock", NULL, MTX_DEF)
   #define IF_ADDR_LOCK_DESTROY(if)        mtx_destroy(&(if)->if_addr_lock)
   
   #define IF_ADDR_WLOCK(if)       mtx_lock(&(if)->if_addr_lock)
   #define IF_ADDR_WUNLOCK(if)     mtx_unlock(&(if)->if_addr_lock)
   #define IF_ADDR_LOCK_ASSERT(if) MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(if)->if_addr_lock))
   #define IF_ADDR_WLOCK_ASSERT(if) mtx_assert(&(if)->if_addr_lock, MA_OWNED)
   
   #ifdef _KERNEL
   /* interface link layer address change event */
   typedef void (*iflladdr_event_handler_t)(void *, struct ifnet *);
   EVENTHANDLER_DECLARE(iflladdr_event, iflladdr_event_handler_t);
   /* interface address change event */
   typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
   EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
   typedef void (*ifaddr_event_ext_handler_t)(void *, struct ifnet *,
       struct ifaddr *, int);
   EVENTHANDLER_DECLARE(ifaddr_event_ext, ifaddr_event_ext_handler_t);
   #define IFADDR_EVENT_ADD        0
   #define IFADDR_EVENT_DEL        1
   /* new interface arrival event */
   typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
   EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
   /* interface departure event */
   typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
   EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
   /* Interface link state change event */
   typedef void (*ifnet_link_event_handler_t)(void *, struct ifnet *, int);
   EVENTHANDLER_DECLARE(ifnet_link_event, ifnet_link_event_handler_t);
   /* Interface up/down event */
   #define IFNET_EVENT_UP          0
   #define IFNET_EVENT_DOWN        1
   #define IFNET_EVENT_PCP         2       /* priority code point, PCP */
   #define IFNET_EVENT_UPDATE_BAUDRATE     3
   
   typedef void (*ifnet_event_fn)(void *, struct ifnet *ifp, int event);
   EVENTHANDLER_DECLARE(ifnet_event, ifnet_event_fn);
   
   /*
    * interface groups
    */
   struct ifg_group {
           char                             ifg_group[IFNAMSIZ];
           u_int                            ifg_refcnt;
           void                            *ifg_pf_kif;
           CK_STAILQ_HEAD(, ifg_member)     ifg_members; /* (CK_) */
           CK_STAILQ_ENTRY(ifg_group)               ifg_next; /* (CK_) */
   };
   
   struct ifg_member {
           CK_STAILQ_ENTRY(ifg_member)      ifgm_next; /* (CK_) */
           struct ifnet            *ifgm_ifp;
   };
   
   struct ifg_list {
           struct ifg_group        *ifgl_group;
           CK_STAILQ_ENTRY(ifg_list)        ifgl_next; /* (CK_) */
   };
   
   #ifdef _SYS_EVENTHANDLER_H_
   /* group attach event */
   typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *);
   EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t);
   /* group detach event */
   typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *);
   EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t);
   /* group change event */
   typedef void (*group_change_event_handler_t)(void *, const char *);
   EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t);
   #endif /* _SYS_EVENTHANDLER_H_ */
   
   #define IF_AFDATA_LOCK_INIT(ifp)        \
           mtx_init(&(ifp)->if_afdata_lock, "if_afdata", NULL, MTX_DEF)
   
   #define IF_AFDATA_WLOCK(ifp)    mtx_lock(&(ifp)->if_afdata_lock)
   #define IF_AFDATA_WUNLOCK(ifp)  mtx_unlock(&(ifp)->if_afdata_lock)
   #define IF_AFDATA_LOCK(ifp)     IF_AFDATA_WLOCK(ifp)
   #define IF_AFDATA_UNLOCK(ifp)   IF_AFDATA_WUNLOCK(ifp)
   #define IF_AFDATA_TRYLOCK(ifp)  mtx_trylock(&(ifp)->if_afdata_lock)
   #define IF_AFDATA_DESTROY(ifp)  mtx_destroy(&(ifp)->if_afdata_lock)
   
   #define IF_AFDATA_LOCK_ASSERT(ifp)      MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(ifp)->if_afdata_lock))
   #define IF_AFDATA_WLOCK_ASSERT(ifp)     mtx_assert(&(ifp)->if_afdata_lock, MA_OWNED)
   #define IF_AFDATA_UNLOCK_ASSERT(ifp)    mtx_assert(&(ifp)->if_afdata_lock, MA_NOTOWNED)
   
   /*
    * 72 was chosen below because it is the size of a TCP/IP
    * header (40) + the minimum mss (32).
    */
   #define IF_MINMTU       72
   #define IF_MAXMTU       65535
   
   #define TOEDEV(ifp)     ((ifp)->if_llsoftc)
   
   /*
    * The ifaddr structure contains information about one address
    * of an interface.  They are maintained by the different address families,
    * are allocated and attached when an address is set, and are linked
    * together so all addresses for an interface can be located.
    *
    * NOTE: a 'struct ifaddr' is always at the beginning of a larger
    * chunk of malloc'ed memory, where we store the three addresses
    * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.
    */
   struct ifaddr {
           struct  sockaddr *ifa_addr;     /* address of interface */
           struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
   #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
           struct  sockaddr *ifa_netmask;  /* used to determine subnet */
           struct  ifnet *ifa_ifp;         /* back-pointer to interface */
           struct  carp_softc *ifa_carp;   /* pointer to CARP data */
           CK_STAILQ_ENTRY(ifaddr) ifa_link;       /* queue macro glue */
           u_short ifa_flags;              /* mostly rt_flags for cloning */
   #define IFA_ROUTE       RTF_UP          /* route installed */
   #define IFA_RTSELF      RTF_HOST        /* loopback route to self installed */
           u_int   ifa_refcnt;             /* references to this structure */
   
           counter_u64_t   ifa_ipackets;
           counter_u64_t   ifa_opackets;
           counter_u64_t   ifa_ibytes;
           counter_u64_t   ifa_obytes;
           struct  epoch_context   ifa_epoch_ctx;
   };
   
   struct ifaddr * ifa_alloc(size_t size, int flags);
   void    ifa_free(struct ifaddr *ifa);
   void    ifa_ref(struct ifaddr *ifa);
   int __result_use_check ifa_try_ref(struct ifaddr *ifa);
   
   /*
    * Multicast address structure.  This is analogous to the ifaddr
    * structure except that it keeps track of multicast addresses.
    */
   #define IFMA_F_ENQUEUED         0x1
   struct ifmultiaddr {
           CK_STAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
           struct  sockaddr *ifma_addr;    /* address this membership is for */
           struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
           struct  ifnet *ifma_ifp;        /* back-pointer to interface */
           u_int   ifma_refcount;          /* reference count */
           int     ifma_flags;
           void    *ifma_protospec;        /* protocol-specific state, if any */
           struct  ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */
           struct  epoch_context   ifma_epoch_ctx;
   };
   
   extern  struct sx ifnet_sxlock;
   
   #define IFNET_WLOCK()           sx_xlock(&ifnet_sxlock)
   #define IFNET_WUNLOCK()         sx_xunlock(&ifnet_sxlock)
   #define IFNET_RLOCK_ASSERT()    sx_assert(&ifnet_sxlock, SA_SLOCKED)
   #define IFNET_WLOCK_ASSERT()    sx_assert(&ifnet_sxlock, SA_XLOCKED)
   #define IFNET_RLOCK()           sx_slock(&ifnet_sxlock)
   #define IFNET_RUNLOCK()         sx_sunlock(&ifnet_sxlock)
   
   /*
    * Look up an ifnet given its index.  The returned value protected from
    * being freed by the network epoch.  The _ref variant also acquires a
    * reference that must be freed using if_rele().
    */
   struct ifnet    *ifnet_byindex(u_int);
   struct ifnet    *ifnet_byindex_ref(u_int);
   
   /*
    * ifnet_byindexgen() looks up ifnet by index and generation count,
    * attempting to restore a weak pointer that had been stored across
    * the epoch.
    */
   struct ifnet   *ifnet_byindexgen(uint16_t idx, uint16_t gen);
   
   VNET_DECLARE(struct ifnethead, ifnet);
   VNET_DECLARE(struct ifgrouphead, ifg_head);
   VNET_DECLARE(struct ifnet *, loif);     /* first loopback interface */
   
   #define V_ifnet         VNET(ifnet)
   #define V_ifg_head      VNET(ifg_head)
   #define V_loif          VNET(loif)
   
   #ifdef MCAST_VERBOSE
   #define MCDPRINTF printf
   #else
   #define MCDPRINTF(...)
   #endif
   
   int     if_addgroup(struct ifnet *, const char *);
   int     if_delgroup(struct ifnet *, const char *);
   int     if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
   int     if_allmulti(struct ifnet *, int);
   struct  ifnet* if_alloc(u_char);
   struct  ifnet* if_alloc_dev(u_char, device_t dev);
   void    if_attach(struct ifnet *);
   void    if_dead(struct ifnet *);
   int     if_delmulti(struct ifnet *, struct sockaddr *);
   void    if_delmulti_ifma(struct ifmultiaddr *);
   void    if_delmulti_ifma_flags(struct ifmultiaddr *, int flags);
   void    if_detach(struct ifnet *);
   void    if_purgeaddrs(struct ifnet *);
   void    if_delallmulti(struct ifnet *);
   void    if_down(struct ifnet *);
   struct ifmultiaddr *
           if_findmulti(struct ifnet *, const struct sockaddr *);
   void    if_freemulti(struct ifmultiaddr *ifma);
   void    if_free(struct ifnet *);
   void    if_initname(struct ifnet *, const char *, int);
   void    if_link_state_change(struct ifnet *, int);
   int     if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
   int     if_log(struct ifnet *, int, const char *, ...) __printflike(3, 4);
   void    if_ref(struct ifnet *);
   void    if_rele(struct ifnet *);
   bool    __result_use_check if_try_ref(struct ifnet *);
   int     if_setlladdr(struct ifnet *, const u_char *, int);
   int     if_tunnel_check_nesting(struct ifnet *, struct mbuf *, uint32_t, int);
   void    if_up(struct ifnet *);
   int     ifioctl(struct socket *, u_long, caddr_t, struct thread *);
   int     ifpromisc(struct ifnet *, int);
   struct  ifnet *ifunit(const char *);
   struct  ifnet *ifunit_ref(const char *);
   
   int     ifa_add_loopback_route(struct ifaddr *, struct sockaddr *);
   int     ifa_del_loopback_route(struct ifaddr *, struct sockaddr *);
   int     ifa_switch_loopback_route(struct ifaddr *, struct sockaddr *);
   
   struct  ifaddr *ifa_ifwithaddr(const struct sockaddr *);
   int             ifa_ifwithaddr_check(const struct sockaddr *);
   struct  ifaddr *ifa_ifwithbroadaddr(const struct sockaddr *, int);
   struct  ifaddr *ifa_ifwithdstaddr(const struct sockaddr *, int);
   struct  ifaddr *ifa_ifwithnet(const struct sockaddr *, int, int);
   struct  ifaddr *ifa_ifwithroute(int, const struct sockaddr *,
       const struct sockaddr *, u_int);
   struct  ifaddr *ifaof_ifpforaddr(const struct sockaddr *, struct ifnet *);
   int     ifa_preferred(struct ifaddr *, struct ifaddr *);
   
   int     if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
   
   typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp);
   typedef void if_com_free_t(void *com, u_char type);
   void    if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f);
   void    if_deregister_com_alloc(u_char type);
   void    if_data_copy(struct ifnet *, struct if_data *);
   uint64_t if_get_counter_default(struct ifnet *, ift_counter);
   void    if_inc_counter(struct ifnet *, ift_counter, int64_t);
   
   #define IF_LLADDR(ifp)                                                  \
       LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr))
   
   uint64_t if_setbaudrate(if_t ifp, uint64_t baudrate);
   uint64_t if_getbaudrate(const if_t ifp);
   int if_setcapabilities(if_t ifp, int capabilities);
   int if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit);
   int if_getcapabilities(const if_t ifp);
   int if_togglecapenable(if_t ifp, int togglecap);
   int if_setcapenable(if_t ifp, int capenable);
   int if_setcapenablebit(if_t ifp, int setcap, int clearcap);
   int if_getcapenable(const if_t ifp);
   int if_getdunit(const if_t ifp);
   int if_getindex(const if_t ifp);
   const char *if_getdname(const if_t ifp);
   void if_setdname(if_t ifp, const char *name);
   const char *if_name(if_t ifp);
   int if_setname(if_t ifp, const char *name);
   void if_setdescr(if_t ifp, char *descrbuf);
   char *if_allocdescr(size_t sz, int malloc_flag);
   void if_freedescr(char *descrbuf);
   int if_getalloctype(const if_t ifp);
   int if_setdev(if_t ifp, void *dev);
   int if_setdrvflagbits(if_t ifp, int if_setflags, int clear_flags);
   int if_getdrvflags(const if_t ifp);
   int if_setdrvflags(if_t ifp, int flags);
   int if_clearhwassist(if_t ifp);
   int if_sethwassistbits(if_t ifp, int toset, int toclear);
   int if_sethwassist(if_t ifp, int hwassist_bit);
   int if_gethwassist(const if_t ifp);
   int if_togglehwassist(if_t ifp, int toggle_bits);
   int if_setsoftc(if_t ifp, void *softc);
   void *if_getsoftc(if_t ifp);
   int if_setflags(if_t ifp, int flags);
   int if_gethwaddr(const if_t ifp, struct ifreq *);
   int if_setmtu(if_t ifp, int mtu);
   int if_getmtu(const if_t ifp);
   int if_getmtu_family(const if_t ifp, int family);
   int if_setflagbits(if_t ifp, int set, int clear);
   int if_getflags(const if_t ifp);
   int if_sendq_empty(if_t ifp);
   int if_setsendqready(if_t ifp);
   int if_setsendqlen(if_t ifp, int tx_desc_count);
   int if_sethwtsomax(if_t ifp, u_int if_hw_tsomax);
   int if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount);
   int if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize);
   u_int if_gethwtsomax(const if_t ifp);
   u_int if_gethwtsomaxsegcount(const if_t ifp);
   u_int if_gethwtsomaxsegsize(const if_t ifp);
   int if_input(if_t ifp, struct mbuf* sendmp);
   int if_sendq_prepend(if_t ifp, struct mbuf *m);
   struct mbuf *if_dequeue(if_t ifp);
   int if_setifheaderlen(if_t ifp, int len);
   void if_setrcvif(struct mbuf *m, if_t ifp);
   void if_setvtag(struct mbuf *m, u_int16_t tag);
   u_int16_t if_getvtag(struct mbuf *m);
   int if_vlantrunkinuse(if_t ifp);
   caddr_t if_getlladdr(const if_t ifp);
   void *if_gethandle(u_char);
   void if_bpfmtap(if_t ifp, struct mbuf *m);
   void if_etherbpfmtap(if_t ifp, struct mbuf *m);
   void if_vlancap(if_t ifp);
   int if_transmit(if_t ifp, struct mbuf *m);
   int if_init(if_t ifp, void *ctx);
   
   /*
    * Traversing through interface address lists.
    */
   struct sockaddr_dl;
   typedef u_int iflladdr_cb_t(void *, struct sockaddr_dl *, u_int);
   u_int if_foreach_lladdr(if_t, iflladdr_cb_t, void *);
   u_int if_foreach_llmaddr(if_t, iflladdr_cb_t, void *);
   u_int if_lladdr_count(if_t);
   u_int if_llmaddr_count(if_t);
   
   int if_getamcount(const if_t ifp);
   struct ifaddr * if_getifaddr(const if_t ifp);
   typedef u_int if_addr_cb_t(void *, struct ifaddr *, u_int);
   u_int if_foreach_addr_type(if_t ifp, int type, if_addr_cb_t cb, void *cb_arg);
   
   /* Functions */
   void if_setinitfn(if_t ifp, if_init_fn_t);
   void if_setinputfn(if_t ifp, if_input_fn_t);
   void if_setioctlfn(if_t ifp, if_ioctl_fn_t);
   void if_setoutputfn(if_t ifp, int(*)
       (if_t, struct mbuf *, const struct sockaddr *, struct route *));
   void if_setstartfn(if_t ifp, void (*)(if_t));
   void if_settransmitfn(if_t ifp, if_transmit_fn_t);
   void if_setqflushfn(if_t ifp, if_qflush_fn_t);
   void if_setgetcounterfn(if_t ifp, if_get_counter_t);
   void if_setsndtagallocfn(if_t ifp, if_snd_tag_alloc_t);
   void if_setdebugnet_methods(struct ifnet *, struct debugnet_methods *);
   
   /* TSO */
   void if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *);
   int if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *);
   
   /* accessors for struct ifreq */
   void *ifr_data_get_ptr(void *ifrp);
   void *ifr_buffer_get_buffer(void *data);
   size_t ifr_buffer_get_length(void *data);
   
   int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
   
   #ifdef DEVICE_POLLING
   enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS };
   
   typedef int poll_handler_t(if_t ifp, enum poll_cmd cmd, int count);
   int    ether_poll_register(poll_handler_t *h, if_t ifp);
   int    ether_poll_deregister(if_t ifp);
   #endif /* DEVICE_POLLING */
   
   #endif /* _KERNEL */
   
   #include <net/if_private.h>     /* XXX: temporary until drivers converted. */
   #include <net/ifq.h>    /* XXXAO: temporary unconditional include */
   
   #endif /* !_NET_IF_VAR_H_ */

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