| 1 | /* $NetBSD: if_dl.h,v 1.26 2014/12/03 01:31:37 christos 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 | /* |
| 72 | * minimum work area, can be larger; contains both if name |
| 73 | * and ll address |
| 74 | */ |
| 75 | char dl_data[12]; |
| 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 | |
| 123 | int dl_print(char *, size_t, const struct dl_addr *); |
| 124 | #define DL_PRINT(b, a) (dl_print((b), sizeof(b), (a)), (b)) |
| 125 | int sdl_print(char *, size_t, const void *); |
| 126 | #endif |
| 127 | |
| 128 | #endif /* !_NET_IF_DL_H_ */ |
| 129 | |