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

     /*
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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_
    
    #ifdef _KERNEL
    #include <sys/queue.h>
    #endif
    
    /*
     * <net/if.h> does not depend on <sys/time.h> on most other systems.  This
     * helps userland compatability.  (struct timeval ifi_lastchange)
     */
    #ifndef _KERNEL
    #include <sys/time.h>
    #endif
    
    struct ifnet;
    
    /*
     * Length of interface external name, including terminating '\0'.
     * Note: this is the same size as a generic device's external name.
     */
    #define         IFNAMSIZ        16
    #define         IF_NAMESIZE     IFNAMSIZ
    
    #ifdef _KERNEL
    /*
     * Structure describing a `cloning' interface.
     */
    struct if_clone {
            LIST_ENTRY(if_clone) ifc_list;  /* on list of cloners */
            const char *ifc_name;           /* name of device, e.g. `gif' */
            size_t ifc_namelen;             /* length of name */
    
            int     (*ifc_create)(struct if_clone *, int *);
            void    (*ifc_destroy)(struct ifnet *);
    };
    
    #define IF_CLONE_INITIALIZER(name, create, destroy)                     \
            { { 0 }, name, sizeof(name) - 1, create, destroy }
    #endif
    
    /*
     * 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 */
            u_char  ifi_type;               /* ethernet, tokenring, etc */
            u_char  ifi_physical;           /* e.g., AUI, Thinnet, 10base-T, etc */
            u_char  ifi_addrlen;            /* media address length */
            u_char  ifi_hdrlen;             /* media header length */
            u_char  ifi_recvquota;          /* polling quota for receive intrs */
            u_char  ifi_xmitquota;          /* polling quota for xmit intrs */
           u_char  ifi_do_not_use;         /* pad for ifi_datalen's position */
           u_char  ifi_datalen;            /* length of this data struct */
           u_long  ifi_mtu;                /* maximum transmission unit */
           u_long  ifi_metric;             /* routing metric (external only) */
           u_long  ifi_baudrate;           /* linespeed */
           /* volatile statistics */
           u_long  ifi_ipackets;           /* packets received on interface */
           u_long  ifi_ierrors;            /* input errors on interface */
           u_long  ifi_opackets;           /* packets sent on interface */
           u_long  ifi_oerrors;            /* output errors on interface */
           u_long  ifi_collisions;         /* collisions on csma interfaces */
           u_long  ifi_ibytes;             /* total number of octets received */
           u_long  ifi_obytes;             /* total number of octets sent */
           u_long  ifi_imcasts;            /* packets received via multicast */
           u_long  ifi_omcasts;            /* packets sent via multicast */
           u_long  ifi_iqdrops;            /* dropped on input, this interface */
           u_long  ifi_noproto;            /* destined for unsupported protocol */
           u_long  ifi_hwassist;           /* HW offload capabilities */
           u_long  ifi_unused;             /* XXX was ifi_xmittiming */
           struct  timeval ifi_lastchange; /* time of last administrative change */
   };
   
   #define IFF_UP          0x1             /* interface is up */
   #define IFF_BROADCAST   0x2             /* broadcast address valid */
   #define IFF_DEBUG       0x4             /* turn on debugging */
   #define IFF_LOOPBACK    0x8             /* is a loopback net */
   #define IFF_POINTOPOINT 0x10            /* interface is point-to-point link */
   #define IFF_SMART       0x20            /* interface manages own routes */
   #define IFF_RUNNING     0x40            /* resources allocated */
   #define IFF_NOARP       0x80            /* no address resolution protocol */
   #define IFF_PROMISC     0x100           /* receive all packets */
   #define IFF_ALLMULTI    0x200           /* receive all multicast packets */
   #define IFF_OACTIVE     0x400           /* transmission in progress */
   #define IFF_SIMPLEX     0x800           /* 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          /* supports multicast */
   
   /*
    * The following flag(s) ought to go in if_flags, but we cannot change
    * struct ifnet because of binary compatibility, so we store them in
    * if_ipending, which is not used so far.
    * If possible, make sure the value is not conflicting with other
    * IFF flags, so we have an easier time when we want to merge them.
    */
   #define IFF_POLLING     0x10000         /* Interface is in polling mode. */
   #define IFF_PPROMISC    0x20000         /* user-requested promisc mode */
   #define IFF_STATICARP   0x80000         /* static ARP */
   
   /* flags set internally only: */
   #define IFF_CANTCHANGE \
           (IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|\
               IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI|IFF_SMART|IFF_POLLING)
   
   /* Capabilities that interfaces can advertise. */
   #define IFCAP_RXCSUM            0x0001  /* can offload checksum on RX */
   #define IFCAP_TXCSUM            0x0002  /* can offload checksum on TX */
   #define IFCAP_NETCONS           0x0004  /* can be a network console */
   #define IFCAP_POLLING           0x0040  /* driver supports polling */
   
   #define IFCAP_HWCSUM            (IFCAP_RXCSUM | IFCAP_TXCSUM)
   
   #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
    */
   struct if_msghdr {
           u_short ifm_msglen;     /* to skip over non-understood messages */
           u_char  ifm_version;    /* future binary compatability */
           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 */
           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
    */
   struct ifa_msghdr {
           u_short ifam_msglen;    /* to skip over non-understood messages */
           u_char  ifam_version;   /* future binary compatability */
           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 */
           int     ifam_metric;    /* value of ifa_metric */
   };
   
   /*
    * 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 compatability */
           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 */
   };
   
   /*
    * 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 */
   
   /*
    * 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;
                   short   ifru_flags[2];
                   int     ifru_metric;
                   int     ifru_mtu;
                   int     ifru_phys;
                   int     ifru_media;
                   caddr_t ifru_data;
                   int     ifru_cap[2];
           } 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 */
   #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_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 */
   #define ifr_data        ifr_ifru.ifru_data      /* for use by interface */
   #define ifr_reqcap      ifr_ifru.ifru_cap[0]    /* requested capabilities */
   #define ifr_curcap      ifr_ifru.ifru_cap[1]    /* current capabilities */
   };
   
   #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;
   };
   
   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 */
   };
   
   /* 
    * 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 */
   };
   
   
   /*
    * Structure for SIOC[AGD]LIFADDR
    */
   struct if_laddrreq {
           char    iflr_name[IFNAMSIZ];
           u_int   flags;
   #define IFLR_PREFIX     0x8000  /* in: prefix given  out: kernel fills id */
           u_int   prefixlen;         /* in/out */
           struct  sockaddr_storage addr;   /* in/out */
           struct  sockaddr_storage dstaddr; /* out */
   };
   
   #ifdef _KERNEL
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_IFADDR);
   MALLOC_DECLARE(M_IFMADDR);
   #endif
   #endif
   
   #ifndef _KERNEL
   struct if_nameindex {
           u_int   if_index;       /* 1, 2, ... */
           char    *if_name;       /* null terminated name: "le0", ... */
   };
   
   __BEGIN_DECLS
   u_int    if_nametoindex __P((const char *));
   char    *if_indextoname __P((u_int, char *));
   struct   if_nameindex *if_nameindex __P((void));
   void     if_freenameindex __P((struct if_nameindex *));
   __END_DECLS
   #endif
   
   #ifdef _KERNEL
   struct proc;
   
   int     prison_if __P((struct proc *p, struct sockaddr *sa));
   
   /* XXX - this should go away soon. */
   #include <net/if_var.h>
   #endif
   
   #endif /* !_NET_IF_H_ */

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