FreeBSD/Linux Kernel Cross Reference
sys/net/if.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.
     *
     *      @(#)if.h        8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    #ifndef _NET_IF_H_
    #define _NET_IF_H_
    
    #include <sys/cdefs.h>
    
    #if __BSD_VISIBLE
    /*
     * <net/if.h> does not depend on <sys/time.h> on most other systems.  This
     * helps userland compatibility.  (struct timeval ifi_lastchange)
     * The same holds for <sys/socket.h>.  (struct sockaddr ifru_addr)
     */
    #ifndef _KERNEL
    #include <sys/time.h>
    #include <sys/socket.h>
    #endif
    #endif
    
    /*
     * Length of interface external name, including terminating '\0'.
     * Note: this is the same size as a generic device's external name.
     */
    #define         IF_NAMESIZE     16
    #if __BSD_VISIBLE
    #define         IFNAMSIZ        IF_NAMESIZE
    #define         IF_MAXUNIT      0x7fff  /* historical value */
    #endif
    #if __BSD_VISIBLE
    
    /*
     * Structure used to query names of interface cloners.
     */
    
    struct if_clonereq {
            int     ifcr_total;             /* total cloners (out) */
            int     ifcr_count;             /* room for this many in user buffer */
            char    *ifcr_buffer;           /* buffer for cloner names */
    };
    
    /*
     * Structure describing information about an interface
     * which may be of interest to management entities.
     */
    struct if_data {
            /* generic interface information */
            uint8_t ifi_type;               /* ethernet, tokenring, etc */
            uint8_t ifi_physical;           /* e.g., AUI, Thinnet, 10base-T, etc */
            uint8_t ifi_addrlen;            /* media address length */
            uint8_t ifi_hdrlen;             /* media header length */
            uint8_t ifi_link_state;         /* current link state */
            uint8_t ifi_vhid;               /* carp vhid */
            uint16_t        ifi_datalen;    /* length of this data struct */
            uint32_t        ifi_mtu;        /* maximum transmission unit */
            uint32_t        ifi_metric;     /* routing metric (external only) */
            uint64_t        ifi_baudrate;   /* linespeed */
            /* volatile statistics */
            uint64_t        ifi_ipackets;   /* packets received on interface */
            uint64_t        ifi_ierrors;    /* input errors on interface */
            uint64_t        ifi_opackets;   /* packets sent on interface */
            uint64_t        ifi_oerrors;    /* output errors on interface */
            uint64_t        ifi_collisions; /* collisions on csma interfaces */
            uint64_t        ifi_ibytes;     /* total number of octets received */
            uint64_t        ifi_obytes;     /* total number of octets sent */
            uint64_t        ifi_imcasts;    /* packets received via multicast */
            uint64_t        ifi_omcasts;    /* packets sent via multicast */
            uint64_t        ifi_iqdrops;    /* dropped on input */
           uint64_t        ifi_oqdrops;    /* dropped on output */
           uint64_t        ifi_noproto;    /* destined for unsupported protocol */
           uint64_t        ifi_hwassist;   /* HW offload capabilities, see IFCAP */
   
           /* Unions are here to make sizes MI. */
           union {                         /* uptime at attach or stat reset */
                   time_t          tt;
                   uint64_t        ph;
           } __ifi_epoch;
   #define ifi_epoch       __ifi_epoch.tt
           union {                         /* time of last administrative change */
                   struct timeval  tv;
                   struct {
                           uint64_t ph1;
                           uint64_t ph2;
                   } ph;
           } __ifi_lastchange;
   #define ifi_lastchange  __ifi_lastchange.tv
   };
   
   /*-
    * Interface flags are of two types: network stack owned flags, and driver
    * owned flags.  Historically, these values were stored in the same ifnet
    * flags field, but with the advent of fine-grained locking, they have been
    * broken out such that the network stack is responsible for synchronizing
    * the stack-owned fields, and the device driver the device-owned fields.
    * Both halves can perform lockless reads of the other half's field, subject
    * to accepting the involved races.
    *
    * Both sets of flags come from the same number space, and should not be
    * permitted to conflict, as they are exposed to user space via a single
    * field.
    *
    * The following symbols identify read and write requirements for fields:
    *
    * (i) if_flags field set by device driver before attach, read-only there
    *     after.
    * (n) if_flags field written only by the network stack, read by either the
    *     stack or driver.
    * (d) if_drv_flags field written only by the device driver, read by either
    *     the stack or driver.
    */
   #define IFF_UP          0x1             /* (n) interface is up */
   #define IFF_BROADCAST   0x2             /* (i) broadcast address valid */
   #define IFF_DEBUG       0x4             /* (n) turn on debugging */
   #define IFF_LOOPBACK    0x8             /* (i) is a loopback net */
   #define IFF_POINTOPOINT 0x10            /* (i) is a point-to-point link */
   #define IFF_KNOWSEPOCH  0x20            /* (i) calls if_input in net epoch */
   #define IFF_DRV_RUNNING 0x40            /* (d) resources allocated */
   #define IFF_NOARP       0x80            /* (n) no address resolution protocol */
   #define IFF_PROMISC     0x100           /* (n) receive all packets */
   #define IFF_ALLMULTI    0x200           /* (n) receive all multicast packets */
   #define IFF_DRV_OACTIVE 0x400           /* (d) tx hardware queue is full */
   #define IFF_SIMPLEX     0x800           /* (i) can't hear own transmissions */
   #define IFF_LINK0       0x1000          /* per link layer defined bit */
   #define IFF_LINK1       0x2000          /* per link layer defined bit */
   #define IFF_LINK2       0x4000          /* per link layer defined bit */
   #define IFF_ALTPHYS     IFF_LINK2       /* use alternate physical connection */
   #define IFF_MULTICAST   0x8000          /* (i) supports multicast */
   #define IFF_CANTCONFIG  0x10000         /* (i) unconfigurable using ioctl(2) */
   #define IFF_PPROMISC    0x20000         /* (n) user-requested promisc mode */
   #define IFF_MONITOR     0x40000         /* (n) user-requested monitor mode */
   #define IFF_STATICARP   0x80000         /* (n) static ARP */
   #define IFF_STICKYARP   0x100000        /* (n) sticky ARP */
   #define IFF_DYING       0x200000        /* (n) interface is winding down */
   #define IFF_RENAMING    0x400000        /* (n) interface is being renamed */
   #define IFF_NOGROUP     0x800000        /* (n) interface is not part of any groups */
   #define IFF_NETLINK_1   0x1000000       /* (n) used by netlink */
   
   /*
    * Old names for driver flags so that user space tools can continue to use
    * the old (portable) names.
    */
   #ifndef _KERNEL
   #define IFF_RUNNING     IFF_DRV_RUNNING
   #define IFF_OACTIVE     IFF_DRV_OACTIVE
   #endif
   
   /* flags set internally only: */
   #define IFF_CANTCHANGE \
           (IFF_BROADCAST|IFF_POINTOPOINT|IFF_DRV_RUNNING|IFF_DRV_OACTIVE|\
               IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI|IFF_PROMISC|\
               IFF_DYING|IFF_CANTCONFIG|IFF_KNOWSEPOCH)
   
   /*
    * Values for if_link_state.
    */
   #define LINK_STATE_UNKNOWN      0       /* link invalid/unknown */
   #define LINK_STATE_DOWN         1       /* link is down */
   #define LINK_STATE_UP           2       /* link is up */
   
   /*
    * Some convenience macros used for setting ifi_baudrate.
    * XXX 1000 vs. 1024? --thorpej@netbsd.org
    */
   #define IF_Kbps(x)      ((uintmax_t)(x) * 1000) /* kilobits/sec. */
   #define IF_Mbps(x)      (IF_Kbps((x) * 1000))   /* megabits/sec. */
   #define IF_Gbps(x)      (IF_Mbps((x) * 1000))   /* gigabits/sec. */
   
   /*
    * Capabilities that interfaces can advertise.
    *
    * struct ifnet.if_capabilities
    *   contains the optional features & capabilities a particular interface
    *   supports (not only the driver but also the detected hw revision).
    *   Capabilities are defined by IFCAP_* below.
    * struct ifnet.if_capenable
    *   contains the enabled (either by default or through ifconfig) optional
    *   features & capabilities on this interface.
    *   Capabilities are defined by IFCAP_* below.
    * struct if_data.ifi_hwassist in mbuf CSUM_ flag form, controlled by above
    *   contains the enabled optional feature & capabilites that can be used
    *   individually per packet and are specified in the mbuf pkthdr.csum_flags
    *   field.  IFCAP_* and CSUM_* do not match one to one and CSUM_* may be
    *   more detailed or differentiated than IFCAP_*.
    *   Hwassist features are defined CSUM_* in sys/mbuf.h
    *
    * Capabilities that cannot be arbitrarily changed with ifconfig/ioctl
    * are listed in IFCAP_CANTCHANGE, similar to IFF_CANTCHANGE.
    * This is not strictly necessary because the common code never
    * changes capabilities, and it is left to the individual driver
    * to do the right thing. However, having the filter here
    * avoids replication of the same code in all individual drivers.
    */
   #define IFCAP_RXCSUM            0x00001  /* can offload checksum on RX */
   #define IFCAP_TXCSUM            0x00002  /* can offload checksum on TX */
   #define IFCAP_NETCONS           0x00004  /* can be a network console */
   #define IFCAP_VLAN_MTU          0x00008 /* VLAN-compatible MTU */
   #define IFCAP_VLAN_HWTAGGING    0x00010 /* hardware VLAN tag support */
   #define IFCAP_JUMBO_MTU         0x00020 /* 9000 byte MTU supported */
   #define IFCAP_POLLING           0x00040 /* driver supports polling */
   #define IFCAP_VLAN_HWCSUM       0x00080 /* can do IFCAP_HWCSUM on VLANs */
   #define IFCAP_TSO4              0x00100 /* can do TCP Segmentation Offload */
   #define IFCAP_TSO6              0x00200 /* can do TCP6 Segmentation Offload */
   #define IFCAP_LRO               0x00400 /* can do Large Receive Offload */
   #define IFCAP_WOL_UCAST         0x00800 /* wake on any unicast frame */
   #define IFCAP_WOL_MCAST         0x01000 /* wake on any multicast frame */
   #define IFCAP_WOL_MAGIC         0x02000 /* wake on any Magic Packet */
   #define IFCAP_TOE4              0x04000 /* interface can offload TCP */
   #define IFCAP_TOE6              0x08000 /* interface can offload TCP6 */
   #define IFCAP_VLAN_HWFILTER     0x10000 /* interface hw can filter vlan tag */
   #define IFCAP_NV                0x20000 /* can do SIOCGIFCAPNV/SIOCSIFCAPNV */
   #define IFCAP_VLAN_HWTSO        0x40000 /* can do IFCAP_TSO on VLANs */
   #define IFCAP_LINKSTATE         0x80000 /* the runtime link state is dynamic */
   #define IFCAP_NETMAP            0x100000 /* netmap mode supported/enabled */
   #define IFCAP_RXCSUM_IPV6       0x200000  /* can offload checksum on IPv6 RX */
   #define IFCAP_TXCSUM_IPV6       0x400000  /* can offload checksum on IPv6 TX */
   #define IFCAP_HWSTATS           0x800000 /* manages counters internally */
   #define IFCAP_TXRTLMT           0x1000000 /* hardware supports TX rate limiting */
   #define IFCAP_HWRXTSTMP         0x2000000 /* hardware rx timestamping */
   #define IFCAP_MEXTPG            0x4000000 /* understands M_EXTPG mbufs */
   #define IFCAP_TXTLS4            0x8000000 /* can do TLS encryption and segmentation for TCP */
   #define IFCAP_TXTLS6            0x10000000 /* can do TLS encryption and segmentation for TCP6 */
   #define IFCAP_VXLAN_HWCSUM      0x20000000 /* can do IFCAN_HWCSUM on VXLANs */
   #define IFCAP_VXLAN_HWTSO       0x40000000 /* can do IFCAP_TSO on VXLANs */
   #define IFCAP_TXTLS_RTLMT       0x80000000 /* can do TLS with rate limiting */
   
   /* IFCAP2_* are integers, not bits. */
   #define IFCAP2_RXTLS4           0
   #define IFCAP2_RXTLS6           1
   
   #define IFCAP2_BIT(x)           (1UL << (x))
   
   #define IFCAP_HWCSUM_IPV6       (IFCAP_RXCSUM_IPV6 | IFCAP_TXCSUM_IPV6)
   
   #define IFCAP_HWCSUM    (IFCAP_RXCSUM | IFCAP_TXCSUM)
   #define IFCAP_TSO       (IFCAP_TSO4 | IFCAP_TSO6)
   #define IFCAP_WOL       (IFCAP_WOL_UCAST | IFCAP_WOL_MCAST | IFCAP_WOL_MAGIC)
   #define IFCAP_TOE       (IFCAP_TOE4 | IFCAP_TOE6)
   #define IFCAP_TXTLS     (IFCAP_TXTLS4 | IFCAP_TXTLS6)
   
   #define IFCAP_CANTCHANGE        (IFCAP_NETMAP | IFCAP_NV)
   #define IFCAP_ALLCAPS           0xffffffff
   
   #define IFCAP_RXCSUM_NAME       "RXCSUM"
   #define IFCAP_TXCSUM_NAME       "TXCSUM"
   #define IFCAP_NETCONS_NAME      "NETCONS"
   #define IFCAP_VLAN_MTU_NAME     "VLAN_MTU"
   #define IFCAP_VLAN_HWTAGGING_NAME "VLAN_HWTAGGING"
   #define IFCAP_JUMBO_MTU_NAME    "JUMBO_MTU"
   #define IFCAP_POLLING_NAME      "POLLING"
   #define IFCAP_VLAN_HWCSUM_NAME  "VLAN_HWCSUM"
   #define IFCAP_TSO4_NAME         "TSO4"
   #define IFCAP_TSO6_NAME         "TSO6"
   #define IFCAP_LRO_NAME          "LRO"
   #define IFCAP_WOL_UCAST_NAME    "WOL_UCAST"
   #define IFCAP_WOL_MCAST_NAME    "WOL_MCAST"
   #define IFCAP_WOL_MAGIC_NAME    "WOL_MAGIC"
   #define IFCAP_TOE4_NAME         "TOE4"
   #define IFCAP_TOE6_NAME         "TOE6"
   #define IFCAP_VLAN_HWFILTER_NAME "VLAN_HWFILTER"
   #define IFCAP_VLAN_HWTSO_NAME   "VLAN_HWTSO"
   #define IFCAP_LINKSTATE_NAME    "LINKSTATE"
   #define IFCAP_NETMAP_NAME       "NETMAP"
   #define IFCAP_RXCSUM_IPV6_NAME  "RXCSUM_IPV6"
   #define IFCAP_TXCSUM_IPV6_NAME  "TXCSUM_IPV6"
   #define IFCAP_HWSTATS_NAME      "HWSTATS"
   #define IFCAP_TXRTLMT_NAME      "TXRTLMT"
   #define IFCAP_HWRXTSTMP_NAME    "HWRXTSTMP"
   #define IFCAP_MEXTPG_NAME       "MEXTPG"
   #define IFCAP_TXTLS4_NAME       "TXTLS4"
   #define IFCAP_TXTLS6_NAME       "TXTLS6"
   #define IFCAP_VXLAN_HWCSUM_NAME "VXLAN_HWCSUM"
   #define IFCAP_VXLAN_HWTSO_NAME  "VXLAN_HWTSO"
   #define IFCAP_TXTLS_RTLMT_NAME  "TXTLS_RTLMT"
   #define IFCAP2_RXTLS4_NAME      "RXTLS4"
   #define IFCAP2_RXTLS6_NAME      "RXTLS6"
   
   #define IFQ_MAXLEN      50
   #define IFNET_SLOWHZ    1               /* granularity is 1 second */
   
   /*
    * Message format for use in obtaining information about interfaces
    * from getkerninfo and the routing socket
    * For the new, extensible interface see struct if_msghdrl below.
    */
   struct if_msghdr {
           u_short ifm_msglen;     /* to skip over non-understood messages */
           u_char  ifm_version;    /* future binary compatibility */
           u_char  ifm_type;       /* message type */
           int     ifm_addrs;      /* like rtm_addrs */
           int     ifm_flags;      /* value of if_flags */
           u_short ifm_index;      /* index for associated ifp */
           u_short _ifm_spare1;
           struct  if_data ifm_data;/* statistics and other data about if */
   };
   
   /*
    * The 'l' version shall be used by new interfaces, like NET_RT_IFLISTL.  It is
    * extensible after ifm_data_off or within ifm_data.  Both the if_msghdr and
    * if_data now have a member field detailing the struct length in addition to
    * the routing message length.  Macros are provided to find the start of
    * ifm_data and the start of the socket address strucutres immediately following
    * struct if_msghdrl given a pointer to struct if_msghdrl.
    */
   #define IF_MSGHDRL_IFM_DATA(_l) \
       (struct if_data *)((char *)(_l) + (_l)->ifm_data_off)
   #define IF_MSGHDRL_RTA(_l) \
       (void *)((uintptr_t)(_l) + (_l)->ifm_len)
   struct if_msghdrl {
           u_short ifm_msglen;     /* to skip over non-understood messages */
           u_char  ifm_version;    /* future binary compatibility */
           u_char  ifm_type;       /* message type */
           int     ifm_addrs;      /* like rtm_addrs */
           int     ifm_flags;      /* value of if_flags */
           u_short ifm_index;      /* index for associated ifp */
           u_short _ifm_spare1;    /* spare space to grow if_index, see if_var.h */
           u_short ifm_len;        /* length of if_msghdrl incl. if_data */
           u_short ifm_data_off;   /* offset of if_data from beginning */
           int     _ifm_spare2;
           struct  if_data ifm_data;/* statistics and other data about if */
   };
   
   /*
    * Message format for use in obtaining information about interface addresses
    * from getkerninfo and the routing socket
    * For the new, extensible interface see struct ifa_msghdrl below.
    */
   struct ifa_msghdr {
           u_short ifam_msglen;    /* to skip over non-understood messages */
           u_char  ifam_version;   /* future binary compatibility */
           u_char  ifam_type;      /* message type */
           int     ifam_addrs;     /* like rtm_addrs */
           int     ifam_flags;     /* value of ifa_flags */
           u_short ifam_index;     /* index for associated ifp */
           u_short _ifam_spare1;
           int     ifam_metric;    /* value of ifa_ifp->if_metric */
   };
   
   /*
    * The 'l' version shall be used by new interfaces, like NET_RT_IFLISTL.  It is
    * extensible after ifam_metric or within ifam_data.  Both the ifa_msghdrl and
    * if_data now have a member field detailing the struct length in addition to
    * the routing message length.  Macros are provided to find the start of
    * ifm_data and the start of the socket address strucutres immediately following
    * struct ifa_msghdrl given a pointer to struct ifa_msghdrl.
    */
   #define IFA_MSGHDRL_IFAM_DATA(_l) \
       (struct if_data *)((char *)(_l) + (_l)->ifam_data_off)
   #define IFA_MSGHDRL_RTA(_l) \
       (void *)((uintptr_t)(_l) + (_l)->ifam_len)
   struct ifa_msghdrl {
           u_short ifam_msglen;    /* to skip over non-understood messages */
           u_char  ifam_version;   /* future binary compatibility */
           u_char  ifam_type;      /* message type */
           int     ifam_addrs;     /* like rtm_addrs */
           int     ifam_flags;     /* value of ifa_flags */
           u_short ifam_index;     /* index for associated ifp */
           u_short _ifam_spare1;   /* spare space to grow if_index, see if_var.h */
           u_short ifam_len;       /* length of ifa_msghdrl incl. if_data */
           u_short ifam_data_off;  /* offset of if_data from beginning */
           int     ifam_metric;    /* value of ifa_ifp->if_metric */
           struct  if_data ifam_data;/* statistics and other data about if or
                                    * address */
   };
   
   /*
    * Message format for use in obtaining information about multicast addresses
    * from the routing socket
    */
   struct ifma_msghdr {
           u_short ifmam_msglen;   /* to skip over non-understood messages */
           u_char  ifmam_version;  /* future binary compatibility */
           u_char  ifmam_type;     /* message type */
           int     ifmam_addrs;    /* like rtm_addrs */
           int     ifmam_flags;    /* value of ifa_flags */
           u_short ifmam_index;    /* index for associated ifp */
           u_short _ifmam_spare1;
   };
   
   /*
    * Message format announcing the arrival or departure of a network interface.
    */
   struct if_announcemsghdr {
           u_short ifan_msglen;    /* to skip over non-understood messages */
           u_char  ifan_version;   /* future binary compatibility */
           u_char  ifan_type;      /* message type */
           u_short ifan_index;     /* index for associated ifp */
           char    ifan_name[IFNAMSIZ]; /* if name, e.g. "en0" */
           u_short ifan_what;      /* what type of announcement */
   };
   
   #define IFAN_ARRIVAL    0       /* interface arrival */
   #define IFAN_DEPARTURE  1       /* interface departure */
   
   /*
    * Buffer with length to be used in SIOCGIFDESCR/SIOCSIFDESCR requests
    */
   struct ifreq_buffer {
           size_t  length;
           void    *buffer;
   };
   
   struct ifreq_nv_req {
           u_int   buf_length;     /* Total size of buffer,
                                      u_int for ABI struct ifreq */
           u_int   length;         /* Length of the filled part */
           void    *buffer;        /* Buffer itself, containing packed nv */
   };
   
   #define IFR_CAP_NV_MAXBUFSIZE   (2 * 1024 * 1024)
   
   /*
    * Interface request structure used for socket
    * ioctl's.  All interface ioctl's must have parameter
    * definitions which begin with ifr_name.  The
    * remainder may be interface specific.
    */
   struct ifreq {
           char    ifr_name[IFNAMSIZ];             /* if name, e.g. "en0" */
           union {
                   struct  sockaddr ifru_addr;
                   struct  sockaddr ifru_dstaddr;
                   struct  sockaddr ifru_broadaddr;
                   struct  ifreq_buffer ifru_buffer;
                   short   ifru_flags[2];
                   short   ifru_index;
                   int     ifru_jid;
                   int     ifru_metric;
                   int     ifru_mtu;
                   int     ifru_phys;
                   int     ifru_media;
                   caddr_t ifru_data;
                   int     ifru_cap[2];
                   u_int   ifru_fib;
                   u_char  ifru_vlan_pcp;
                   struct  ifreq_nv_req ifru_nv;
           } ifr_ifru;
   #define ifr_addr        ifr_ifru.ifru_addr      /* address */
   #define ifr_dstaddr     ifr_ifru.ifru_dstaddr   /* other end of p-to-p link */
   #define ifr_broadaddr   ifr_ifru.ifru_broadaddr /* broadcast address */
   #ifndef _KERNEL
   #define ifr_buffer      ifr_ifru.ifru_buffer    /* user supplied buffer with its length */
   #endif
   #define ifr_flags       ifr_ifru.ifru_flags[0]  /* flags (low 16 bits) */
   #define ifr_flagshigh   ifr_ifru.ifru_flags[1]  /* flags (high 16 bits) */
   #define ifr_jid         ifr_ifru.ifru_jid       /* jail/vnet */
   #define ifr_metric      ifr_ifru.ifru_metric    /* metric */
   #define ifr_mtu         ifr_ifru.ifru_mtu       /* mtu */
   #define ifr_phys        ifr_ifru.ifru_phys      /* physical wire */
   #define ifr_media       ifr_ifru.ifru_media     /* physical media */
   #ifndef _KERNEL
   #define ifr_data        ifr_ifru.ifru_data      /* for use by interface */
   #endif
   #define ifr_reqcap      ifr_ifru.ifru_cap[0]    /* requested capabilities */
   #define ifr_curcap      ifr_ifru.ifru_cap[1]    /* current capabilities */
   #define ifr_index       ifr_ifru.ifru_index     /* interface index */
   #define ifr_fib         ifr_ifru.ifru_fib       /* interface fib */
   #define ifr_vlan_pcp    ifr_ifru.ifru_vlan_pcp  /* VLAN priority */
   #define ifr_lan_pcp     ifr_ifru.ifru_vlan_pcp  /* VLAN priority */
   #define ifr_cap_nv      ifr_ifru.ifru_nv        /* nv-based cap interface */
   };
   
   #define _SIZEOF_ADDR_IFREQ(ifr) \
           ((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \
            (sizeof(struct ifreq) - sizeof(struct sockaddr) + \
             (ifr).ifr_addr.sa_len) : sizeof(struct ifreq))
   
   struct ifaliasreq {
           char    ifra_name[IFNAMSIZ];            /* if name, e.g. "en0" */
           struct  sockaddr ifra_addr;
           struct  sockaddr ifra_broadaddr;
           struct  sockaddr ifra_mask;
           int     ifra_vhid;
   };
   
   /* 9.x compat */
   struct oifaliasreq {
           char    ifra_name[IFNAMSIZ];
           struct  sockaddr ifra_addr;
           struct  sockaddr ifra_broadaddr;
           struct  sockaddr ifra_mask;
   };
   
   struct ifmediareq {
           char    ifm_name[IFNAMSIZ];     /* if name, e.g. "en0" */
           int     ifm_current;            /* current media options */
           int     ifm_mask;               /* don't care mask */
           int     ifm_status;             /* media status */
           int     ifm_active;             /* active options */
           int     ifm_count;              /* # entries in ifm_ulist array */
           int     *ifm_ulist;             /* media words */
   };
   
   struct ifdrv {
           char            ifd_name[IFNAMSIZ];     /* if name, e.g. "en0" */
           unsigned long   ifd_cmd;
           size_t          ifd_len;
           void            *ifd_data;
   };
   
   /* 
    * Structure used to retrieve aux status data from interfaces.
    * Kernel suppliers to this interface should respect the formatting
    * needed by ifconfig(8): each line starts with a TAB and ends with
    * a newline.  The canonical example to copy and paste is in if_tun.c.
    */
   
   #define IFSTATMAX       800             /* 10 lines of text */
   struct ifstat {
           char    ifs_name[IFNAMSIZ];     /* if name, e.g. "en0" */
           char    ascii[IFSTATMAX + 1];
   };
   
   /*
    * Structure used in SIOCGIFCONF request.
    * Used to retrieve interface configuration
    * for machine (useful for programs which
    * must know all networks accessible).
    */
   struct ifconf {
           int     ifc_len;                /* size of associated buffer */
           union {
                   caddr_t ifcu_buf;
                   struct  ifreq *ifcu_req;
           } ifc_ifcu;
   #define ifc_buf ifc_ifcu.ifcu_buf       /* buffer address */
   #define ifc_req ifc_ifcu.ifcu_req       /* array of structures returned */
   };
   
   /*
    * interface groups
    */
   
   #define IFG_ALL         "all"           /* group contains all interfaces */
   /* XXX: will we implement this? */
   #define IFG_EGRESS      "egress"        /* if(s) default route(s) point to */
   
   struct ifg_req {
           union {
                   char                     ifgrqu_group[IFNAMSIZ];
                   char                     ifgrqu_member[IFNAMSIZ];
           } ifgrq_ifgrqu;
   #define ifgrq_group     ifgrq_ifgrqu.ifgrqu_group
   #define ifgrq_member    ifgrq_ifgrqu.ifgrqu_member
   };
   
   /*
    * Used to lookup groups for an interface
    */
   struct ifgroupreq {
           char    ifgr_name[IFNAMSIZ];
           u_int   ifgr_len;
           union {
                   char    ifgru_group[IFNAMSIZ];
                   struct  ifg_req *ifgru_groups;
           } ifgr_ifgru;
   #define ifgr_group      ifgr_ifgru.ifgru_group
   #define ifgr_groups     ifgr_ifgru.ifgru_groups
   };
   
   /*
    * Structure used to request i2c data
    * from interface transceivers.
    */
   struct ifi2creq {
           uint8_t dev_addr;       /* i2c address (0xA0, 0xA2) */
           uint8_t offset;         /* read offset */
           uint8_t len;            /* read length */
           uint8_t spare0;
           uint32_t spare1;
           uint8_t data[8];        /* read buffer */
   }; 
   
   /*
    * RSS hash.
    */
   
   #define RSS_FUNC_NONE           0               /* RSS disabled */
   #define RSS_FUNC_PRIVATE        1               /* non-standard */
   #define RSS_FUNC_TOEPLITZ       2
   
   #define RSS_TYPE_IPV4           0x00000001
   #define RSS_TYPE_TCP_IPV4       0x00000002
   #define RSS_TYPE_IPV6           0x00000004
   #define RSS_TYPE_IPV6_EX        0x00000008
   #define RSS_TYPE_TCP_IPV6       0x00000010
   #define RSS_TYPE_TCP_IPV6_EX    0x00000020
   #define RSS_TYPE_UDP_IPV4       0x00000040
   #define RSS_TYPE_UDP_IPV6       0x00000080
   #define RSS_TYPE_UDP_IPV6_EX    0x00000100
   
   #define RSS_KEYLEN              128
   
   struct ifrsskey {
           char            ifrk_name[IFNAMSIZ];    /* if name, e.g. "en0" */
           uint8_t         ifrk_func;              /* RSS_FUNC_ */
           uint8_t         ifrk_spare0;
           uint16_t        ifrk_keylen;
           uint8_t         ifrk_key[RSS_KEYLEN];
   };
   
   struct ifrsshash {
           char            ifrh_name[IFNAMSIZ];    /* if name, e.g. "en0" */
           uint8_t         ifrh_func;              /* RSS_FUNC_ */
           uint8_t         ifrh_spare0;
           uint16_t        ifrh_spare1;
           uint32_t        ifrh_types;             /* RSS_TYPE_ */
   };
   
   #define IFNET_PCP_NONE  0xff    /* PCP disabled */
   
   #define IFDR_MSG_SIZE           64
   #define IFDR_REASON_MSG         1
   #define IFDR_REASON_VENDOR      2
   struct ifdownreason {
           char            ifdr_name[IFNAMSIZ];
           uint32_t        ifdr_reason;
           uint32_t        ifdr_vendor;
           char            ifdr_msg[IFDR_MSG_SIZE];
   };
   
   #endif /* __BSD_VISIBLE */
   
   /*
    * Opaque interface structure.
    */
   
   typedef struct ifnet * if_t;
   
   #ifdef _KERNEL
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_IFADDR);
   MALLOC_DECLARE(M_IFMADDR);
   #endif
   
   extern struct sx ifnet_detach_sxlock;
   
   struct nvlist;
   struct ifcap_nv_bit_name;
   int if_capnv_to_capint(const struct nvlist *nv, int *old_cap,
       const struct ifcap_nv_bit_name *nn, bool all);
   void if_capint_to_capnv(struct nvlist *nv,
       const struct ifcap_nv_bit_name *nn, int ifr_cap, int ifr_req);
   struct siocsifcapnv_driver_data {
           int reqcap;
           int reqcap2;
           struct nvlist *nvcap;
   };
   #endif
   
   #ifndef _KERNEL
   struct if_nameindex {
           unsigned int    if_index;       /* 1, 2, ... */
           char            *if_name;       /* null terminated name: "le0", ... */
   };
   
   __BEGIN_DECLS
   void                     if_freenameindex(struct if_nameindex *);
   char                    *if_indextoname(unsigned int, char *);
   struct if_nameindex     *if_nameindex(void);
   unsigned int             if_nametoindex(const char *);
   __END_DECLS
   #endif
   #endif /* !_NET_IF_H_ */

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