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 | |