1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 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
32#ifndef lint
33static const char rcsid[] =
34  "$FreeBSD$";
35#endif /* not lint */
36
37#include <sys/types.h>
38#include <sys/ioctl.h>
39#include <sys/socket.h>
40#include <net/if.h>
41
42#include <err.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include <ifaddrs.h>
47#include <unistd.h>
48
49#include <net/if_dl.h>
50#include <net/if_types.h>
51#include <net/ethernet.h>
52
53#include "ifconfig.h"
54
55static struct ifreq link_ridreq;
56
57extern char *f_ether;
58
59static void
60link_status(int s __unused, const struct ifaddrs *ifa)
61{
62	/* XXX no const 'cuz LLADDR is defined wrong */
63	struct sockaddr_dl *sdl;
64	char *ether_format, *format_char;
65	struct ifreq ifr;
66	int n, rc, sock_hw;
67	static const u_char laggaddr[6] = {0};
68
69	sdl = (struct sockaddr_dl *) ifa->ifa_addr;
70	if (sdl == NULL || sdl->sdl_alen == 0)
71		return;
72
73	if ((sdl->sdl_type == IFT_ETHER || sdl->sdl_type == IFT_L2VLAN ||
74	    sdl->sdl_type == IFT_BRIDGE) && sdl->sdl_alen == ETHER_ADDR_LEN) {
75		ether_format = ether_ntoa((struct ether_addr *)LLADDR(sdl));
76		if (f_ether != NULL && strcmp(f_ether, "dash") == 0) {
77			while ((format_char = strchr(ether_format, ':')) !=
78			    NULL) {
79				*format_char = '-';
80			}
81		}
82		printf("\tether %s\n", ether_format);
83	} else {
84		n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0;
85		printf("\tlladdr %s\n", link_ntoa(sdl) + n);
86	}
87
88	/*
89	 * Best-effort (i.e. failures are silent) to get original
90	 * hardware address, as read by NIC driver at attach time. Only
91	 * applies to Ethernet NICs (IFT_ETHER). However, laggX
92	 * interfaces claim to be IFT_ETHER, and re-type their component
93	 * Ethernet NICs as IFT_IEEE8023ADLAG. So, check for both. If
94	 * the MAC is zeroed, then it's actually a lagg.
95	 */
96	if ((sdl->sdl_type != IFT_ETHER &&
97	    sdl->sdl_type != IFT_IEEE8023ADLAG) ||
98	    sdl->sdl_alen != ETHER_ADDR_LEN)
99		return;
100
101	strncpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
102	memcpy(&ifr.ifr_addr, ifa->ifa_addr, sizeof(ifa->ifa_addr->sa_len));
103	ifr.ifr_addr.sa_family = AF_LOCAL;
104	if ((sock_hw = socket(AF_LOCAL, SOCK_DGRAM, 0)) < 0) {
105		warn("socket(AF_LOCAL,SOCK_DGRAM)");
106		return;
107	}
108	rc = ioctl(sock_hw, SIOCGHWADDR, &ifr);
109	close(sock_hw);
110	if (rc != 0)
111		return;
112
113	/*
114	 * If this is definitely a lagg device or the hwaddr
115	 * matches the link addr, don't bother.
116	 */
117	if (memcmp(ifr.ifr_addr.sa_data, laggaddr, sdl->sdl_alen) == 0 ||
118	    memcmp(ifr.ifr_addr.sa_data, LLADDR(sdl), sdl->sdl_alen) == 0)
119		goto pcp;
120
121	ether_format = ether_ntoa((const struct ether_addr *)
122	    &ifr.ifr_addr.sa_data);
123	if (f_ether != NULL && strcmp(f_ether, "dash") == 0) {
124		for (format_char = strchr(ether_format, ':');
125		     format_char != NULL;
126		     format_char = strchr(ether_format, ':'))
127			*format_char = '-';
128	}
129	printf("\thwaddr %s\n", ether_format);
130
131pcp:
132	if (ioctl(s, SIOCGLANPCP, (caddr_t)&ifr) == 0 &&
133	    ifr.ifr_lan_pcp != IFNET_PCP_NONE)
134		printf("\tpcp %d\n", ifr.ifr_lan_pcp);
135}
136
137static void
138link_getaddr(const char *addr, int which)
139{
140	char *temp;
141	struct sockaddr_dl sdl;
142	struct sockaddr *sa = &link_ridreq.ifr_addr;
143
144	if (which != ADDR)
145		errx(1, "can't set link-level netmask or broadcast");
146	if (!strcmp(addr, "random")) {
147		sdl.sdl_len = sizeof(sdl);
148		sdl.sdl_alen = ETHER_ADDR_LEN;
149		sdl.sdl_nlen = 0;
150		sdl.sdl_family = AF_LINK;
151		arc4random_buf(&sdl.sdl_data, ETHER_ADDR_LEN);
152		/* Non-multicast and claim it is locally administered. */
153		sdl.sdl_data[0] &= 0xfc;
154		sdl.sdl_data[0] |= 0x02;
155	} else {
156		if ((temp = malloc(strlen(addr) + 2)) == NULL)
157			errx(1, "malloc failed");
158		temp[0] = ':';
159		strcpy(temp + 1, addr);
160		sdl.sdl_len = sizeof(sdl);
161		link_addr(temp, &sdl);
162		free(temp);
163	}
164	if (sdl.sdl_alen > sizeof(sa->sa_data))
165		errx(1, "malformed link-level address");
166	sa->sa_family = AF_LINK;
167	sa->sa_len = sdl.sdl_alen;
168	bcopy(LLADDR(&sdl), sa->sa_data, sdl.sdl_alen);
169}
170
171static struct afswtch af_link = {
172	.af_name	= "link",
173	.af_af		= AF_LINK,
174	.af_status	= link_status,
175	.af_getaddr	= link_getaddr,
176	.af_aifaddr	= SIOCSIFLLADDR,
177	.af_addreq	= &link_ridreq,
178};
179static struct afswtch af_ether = {
180	.af_name	= "ether",
181	.af_af		= AF_LINK,
182	.af_status	= link_status,
183	.af_getaddr	= link_getaddr,
184	.af_aifaddr	= SIOCSIFLLADDR,
185	.af_addreq	= &link_ridreq,
186};
187static struct afswtch af_lladdr = {
188	.af_name	= "lladdr",
189	.af_af		= AF_LINK,
190	.af_status	= link_status,
191	.af_getaddr	= link_getaddr,
192	.af_aifaddr	= SIOCSIFLLADDR,
193	.af_addreq	= &link_ridreq,
194};
195
196static __constructor void
197link_ctor(void)
198{
199	af_register(&af_link);
200	af_register(&af_ether);
201	af_register(&af_lladdr);
202}
203