af_link.c revision 154401 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char rcsid[] =
32  "$FreeBSD: head/sbin/ifconfig/af_link.c 154401 2006-01-15 19:17:13Z ru $";
33#endif /* not lint */
34
35#include <sys/types.h>
36#include <sys/ioctl.h>
37#include <sys/socket.h>
38#include <net/if.h>
39#include <net/route.h>		/* for RTX_IFA */
40
41#include <err.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45
46#include <net/if_dl.h>
47#include <net/if_types.h>
48#include <net/ethernet.h>
49
50#include "ifconfig.h"
51
52static struct ifreq link_ridreq;
53
54static void
55link_status(int s __unused, const struct rt_addrinfo *info)
56{
57	const struct sockaddr_dl *sdl =
58		(const struct sockaddr_dl *) info->rti_info[RTAX_IFA];
59
60	if (sdl != NULL && sdl->sdl_alen > 0) {
61		if (sdl->sdl_type == IFT_ETHER &&
62		    sdl->sdl_alen == ETHER_ADDR_LEN)
63			printf("\tether %s\n",
64			    ether_ntoa((const struct ether_addr *)LLADDR(sdl)));
65		else {
66			int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0;
67
68			printf("\tlladdr %s\n", link_ntoa(sdl) + n);
69		}
70	}
71}
72
73static void
74link_getaddr(const char *addr, int which)
75{
76	char *temp;
77	struct sockaddr_dl sdl;
78	struct sockaddr *sa = &link_ridreq.ifr_addr;
79
80	if (which != ADDR)
81		errx(1, "can't set link-level netmask or broadcast");
82	if ((temp = malloc(strlen(addr) + 2)) == NULL)
83		errx(1, "malloc failed");
84	temp[0] = ':';
85	strcpy(temp + 1, addr);
86	sdl.sdl_len = sizeof(sdl);
87	link_addr(temp, &sdl);
88	free(temp);
89	if (sdl.sdl_alen > sizeof(sa->sa_data))
90		errx(1, "malformed link-level address");
91	sa->sa_family = AF_LINK;
92	sa->sa_len = sdl.sdl_alen;
93	bcopy(LLADDR(&sdl), sa->sa_data, sdl.sdl_alen);
94}
95
96static struct afswtch af_link = {
97	.af_name	= "link",
98	.af_af		= AF_LINK,
99	.af_status	= link_status,
100	.af_getaddr	= link_getaddr,
101	.af_aifaddr	= SIOCSIFLLADDR,
102	.af_addreq	= &link_ridreq,
103};
104static struct afswtch af_ether = {
105	.af_name	= "ether",
106	.af_af		= AF_LINK,
107	.af_status	= link_status,
108	.af_getaddr	= link_getaddr,
109	.af_aifaddr	= SIOCSIFLLADDR,
110	.af_addreq	= &link_ridreq,
111};
112static struct afswtch af_lladdr = {
113	.af_name	= "lladdr",
114	.af_af		= AF_LINK,
115	.af_status	= link_status,
116	.af_getaddr	= link_getaddr,
117	.af_aifaddr	= SIOCSIFLLADDR,
118	.af_addreq	= &link_ridreq,
119};
120
121static __constructor void
122link_ctor(void)
123{
124	af_register(&af_link);
125	af_register(&af_ether);
126	af_register(&af_lladdr);
127}
128