1 /* $NetBSD: if_dl.h,v 1.31 2022/11/07 08:32:35 msaitoh Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if_dl.h 8.1 (Berkeley) 6/10/93 32 */ 33 34 /* 35 * A Link-Level Sockaddr may specify the interface in one of two 36 * ways: either by means of a system-provided index number (computed 37 * anew and possibly differently on every reboot), or by a human-readable 38 * string such as "il0" (for managerial convenience). 39 * 40 * Census taking actions, such as something akin to SIOCGCONF would return 41 * both the index and the human name. 42 * 43 * High volume transactions (such as giving a link-level ``from'' address 44 * in a recvfrom or recvmsg call) may be likely only to provide the indexed 45 * form, (which requires fewer copy operations and less space). 46 * 47 * The form and interpretation of the link-level address is purely a matter 48 * of convention between the device driver and its consumers; however, it is 49 * expected that all drivers for an interface of a given if_type will agree. 50 */ 51 52 #ifndef _NET_IF_DL_H_ 53 #define _NET_IF_DL_H_ 54 55 #include <sys/ansi.h> 56 57 #ifndef sa_family_t 58 typedef __sa_family_t sa_family_t; 59 #define sa_family_t __sa_family_t 60 #endif 61 #ifndef socklen_t 62 typedef __socklen_t socklen_t; 63 #define socklen_t __socklen_t 64 #endif 65 66 struct dl_addr { 67 uint8_t dl_type; /* interface type */ 68 uint8_t dl_nlen; /* interface name length, no trailing 0 reqd. */ 69 uint8_t dl_alen; /* link level address length */ 70 uint8_t dl_slen; /* link layer selector length */ 71 char dl_data[24]; /* 72 * minimum work area, can be larger; contains 73 * both if name and ll address; big enough for 74 * IFNAMSIZ plus 8byte ll addr. 75 */ 76 }; 77 78 /* 79 * Structure of a Link-Level sockaddr: 80 */ 81 struct sockaddr_dl { 82 uint8_t sdl_len; /* Total length of sockaddr */ 83 sa_family_t sdl_family; /* AF_LINK */ 84 uint16_t sdl_index; /* if != 0, system given index for interface */ 85 struct dl_addr sdl_addr; 86 #define sdl_type sdl_addr.dl_type 87 #define sdl_nlen sdl_addr.dl_nlen 88 #define sdl_alen sdl_addr.dl_alen 89 #define sdl_slen sdl_addr.dl_slen 90 #define sdl_data sdl_addr.dl_data 91 }; 92 93 #define satosdl(__sa) ((struct sockaddr_dl *)(__sa)) 94 #define satocsdl(__sa) ((const struct sockaddr_dl *)(__sa)) 95 96 /* We do arithmetic directly with these, so keep them char instead of void */ 97 #define LLADDR(s) ((char *)((s)->sdl_data + (s)->sdl_nlen)) 98 #define CLLADDR(s) ((const char *)((s)->sdl_data + (s)->sdl_nlen)) 99 100 #ifdef _KERNEL 101 uint8_t sockaddr_dl_measure(uint8_t, uint8_t); 102 struct sockaddr *sockaddr_dl_alloc(uint16_t, uint8_t, 103 const void *, uint8_t, const void *, uint8_t, int); 104 struct sockaddr_dl *sockaddr_dl_init(struct sockaddr_dl *, socklen_t, uint16_t, 105 uint8_t, const void *, uint8_t, const void *, uint8_t); 106 struct sockaddr_dl *sockaddr_dl_setaddr(struct sockaddr_dl *, socklen_t, 107 const void *, uint8_t); 108 #else 109 110 #include <sys/cdefs.h> 111 112 __BEGIN_DECLS 113 void link_addr(const char *, struct sockaddr_dl *); 114 char *link_ntoa(const struct sockaddr_dl *); 115 __END_DECLS 116 117 #endif /* !_KERNEL */ 118 119 #if defined(_KERNEL) || defined(_TEST) 120 // 255 xx: + 255 'a' + / + # + 3 digits + NUL 121 #define LINK_ADDRSTRLEN ((255 * 4) + 5) 122 #define LLA_ADDRSTRLEN (16 * 3) 123 124 char *lla_snprintf(char *, size_t, const void *, size_t); 125 int dl_print(char *, size_t, const struct dl_addr *); 126 #define DL_PRINT(b, a) (dl_print((b), sizeof(b), (a)), (b)) 127 int sdl_print(char *, size_t, const void *); 128 #endif 129 130 #endif /* !_NET_IF_DL_H_ */ 131