131 lines
4.8 KiB
C
131 lines
4.8 KiB
C
/* $NetBSD: if_dl.h,v 1.28 2019/04/30 20:55:41 kre Exp $ */
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/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)if_dl.h 8.1 (Berkeley) 6/10/93
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*/
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/*
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* A Link-Level Sockaddr may specify the interface in one of two
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* ways: either by means of a system-provided index number (computed
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* anew and possibly differently on every reboot), or by a human-readable
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* string such as "il0" (for managerial convenience).
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*
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* Census taking actions, such as something akin to SIOCGCONF would return
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* both the index and the human name.
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*
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* High volume transactions (such as giving a link-level ``from'' address
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* in a recvfrom or recvmsg call) may be likely only to provide the indexed
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* form, (which requires fewer copy operations and less space).
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*
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* The form and interpretation of the link-level address is purely a matter
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* of convention between the device driver and its consumers; however, it is
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* expected that all drivers for an interface of a given if_type will agree.
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*/
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#ifndef _NET_IF_DL_H_
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#define _NET_IF_DL_H_
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#include <sys/ansi.h>
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#ifndef sa_family_t
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typedef __sa_family_t sa_family_t;
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#define sa_family_t __sa_family_t
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#endif
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#ifndef socklen_t
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typedef __socklen_t socklen_t;
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#define socklen_t __socklen_t
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#endif
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struct dl_addr {
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uint8_t dl_type; /* interface type */
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uint8_t dl_nlen; /* interface name length, no trailing 0 reqd. */
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uint8_t dl_alen; /* link level address length */
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uint8_t dl_slen; /* link layer selector length */
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/*
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* minimum work area, can be larger; contains both if name
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* and ll address
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*/
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char dl_data[12];
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};
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/*
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* Structure of a Link-Level sockaddr:
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*/
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struct sockaddr_dl {
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uint8_t sdl_len; /* Total length of sockaddr */
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sa_family_t sdl_family; /* AF_LINK */
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uint16_t sdl_index; /* if != 0, system given index for interface */
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struct dl_addr sdl_addr;
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#define sdl_type sdl_addr.dl_type
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#define sdl_nlen sdl_addr.dl_nlen
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#define sdl_alen sdl_addr.dl_alen
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#define sdl_slen sdl_addr.dl_slen
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#define sdl_data sdl_addr.dl_data
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};
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#define satosdl(__sa) ((struct sockaddr_dl *)(__sa))
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#define satocsdl(__sa) ((const struct sockaddr_dl *)(__sa))
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/* We do arithmetic directly with these, so keep them char instead of void */
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#define LLADDR(s) ((char *)((s)->sdl_data + (s)->sdl_nlen))
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#define CLLADDR(s) ((const char *)((s)->sdl_data + (s)->sdl_nlen))
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#ifdef _KERNEL
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uint8_t sockaddr_dl_measure(uint8_t, uint8_t);
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struct sockaddr *sockaddr_dl_alloc(uint16_t, uint8_t,
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const void *, uint8_t, const void *, uint8_t, int);
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struct sockaddr_dl *sockaddr_dl_init(struct sockaddr_dl *, socklen_t, uint16_t,
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uint8_t, const void *, uint8_t, const void *, uint8_t);
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struct sockaddr_dl *sockaddr_dl_setaddr(struct sockaddr_dl *, socklen_t,
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const void *, uint8_t);
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#else
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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void link_addr(const char *, struct sockaddr_dl *);
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char *link_ntoa(const struct sockaddr_dl *);
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__END_DECLS
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#endif /* !_KERNEL */
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#if defined(_KERNEL) || defined(_TEST)
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// 255 xx: + 255 'a' + / + # + 3 digits + NUL
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#define LINK_ADDRSTRLEN ((255 * 4) + 5)
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#define LLA_ADDRSTRLEN (16 * 3)
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char *lla_snprintf(char *, size_t, const void *, size_t);
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int dl_print(char *, size_t, const struct dl_addr *);
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#define DL_PRINT(b, a) (dl_print((b), sizeof(b), (a)), (b))
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int sdl_print(char *, size_t, const void *);
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#endif
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#endif /* !_NET_IF_DL_H_ */
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