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

     /*      $NetBSD: if_dl.h,v 1.31 2022/11/07 08:32:35 msaitoh Exp $       */
     
     /*
      * Copyright (c) 1990, 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_dl.h     8.1 (Berkeley) 6/10/93
     */
    
    /*
     * A Link-Level Sockaddr may specify the interface in one of two
     * ways: either by means of a system-provided index number (computed
     * anew and possibly differently on every reboot), or by a human-readable
     * string such as "il0" (for managerial convenience).
     *
     * Census taking actions, such as something akin to SIOCGCONF would return
     * both the index and the human name.
     *
     * High volume transactions (such as giving a link-level ``from'' address
     * in a recvfrom or recvmsg call) may be likely only to provide the indexed
     * form, (which requires fewer copy operations and less space).
     *
     * The form and interpretation  of the link-level address is purely a matter
     * of convention between the device driver and its consumers; however, it is
     * expected that all drivers for an interface of a given if_type will agree.
     */
    
    #ifndef _NET_IF_DL_H_
    #define _NET_IF_DL_H_
    
    #include <sys/ansi.h>
    
    #ifndef sa_family_t
    typedef __sa_family_t   sa_family_t;
    #define sa_family_t     __sa_family_t
    #endif
    #ifndef socklen_t
    typedef __socklen_t   socklen_t;
    #define socklen_t     __socklen_t
    #endif
    
    struct dl_addr {
            uint8_t     dl_type;    /* interface type */
            uint8_t     dl_nlen;    /* interface name length, no trailing 0 reqd. */
            uint8_t     dl_alen;    /* link level address length */
            uint8_t     dl_slen;    /* link layer selector length */
            char        dl_data[24]; /*
                                      * minimum work area, can be larger; contains
                                      * both if name and ll address; big enough for
                                      * IFNAMSIZ plus 8byte ll addr.
                                      */
    };
    
    /*
     * Structure of a Link-Level sockaddr:
     */
    struct sockaddr_dl {
            uint8_t     sdl_len;    /* Total length of sockaddr */
            sa_family_t sdl_family; /* AF_LINK */
            uint16_t    sdl_index;  /* if != 0, system given index for interface */
            struct dl_addr sdl_addr;
    #define sdl_type        sdl_addr.dl_type
    #define sdl_nlen        sdl_addr.dl_nlen
    #define sdl_alen        sdl_addr.dl_alen
    #define sdl_slen        sdl_addr.dl_slen
    #define sdl_data        sdl_addr.dl_data
    };
    
    #define satosdl(__sa)   ((struct sockaddr_dl *)(__sa))
    #define satocsdl(__sa)  ((const struct sockaddr_dl *)(__sa))
    
    /* We do arithmetic directly with these, so keep them char instead of void */
    #define LLADDR(s) ((char *)((s)->sdl_data + (s)->sdl_nlen))
    #define CLLADDR(s) ((const char *)((s)->sdl_data + (s)->sdl_nlen))
    
   #ifdef _KERNEL
   uint8_t sockaddr_dl_measure(uint8_t, uint8_t);
   struct sockaddr *sockaddr_dl_alloc(uint16_t, uint8_t,
       const void *, uint8_t, const void *, uint8_t, int);
   struct sockaddr_dl *sockaddr_dl_init(struct sockaddr_dl *, socklen_t, uint16_t,
       uint8_t, const void *, uint8_t, const void *, uint8_t);
   struct sockaddr_dl *sockaddr_dl_setaddr(struct sockaddr_dl *, socklen_t,
       const void *, uint8_t);
   #else
   
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   void    link_addr(const char *, struct sockaddr_dl *);
   char    *link_ntoa(const struct sockaddr_dl *);
   __END_DECLS
   
   #endif /* !_KERNEL */
   
   #if defined(_KERNEL) || defined(_TEST)
   // 255 xx: + 255 'a' + / + # + 3 digits + NUL
   #define LINK_ADDRSTRLEN ((255 * 4) + 5)
   #define LLA_ADDRSTRLEN  (16 * 3)
   
   char    *lla_snprintf(char *, size_t, const void *, size_t);
   int     dl_print(char *, size_t, const struct dl_addr *);
   #define DL_PRINT(b, a) (dl_print((b), sizeof(b), (a)), (b))
   int     sdl_print(char *, size_t, const void *);
   #endif
   
   #endif /* !_NET_IF_DL_H_ */

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