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
33 static 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 #ifdef FSTACK
54 #include <openssl/rand.h>
55 #endif
56
57 #include "ifconfig.h"
58
59 static struct ifreq link_ridreq;
60
61 extern char *f_ether;
62
63 static void
link_status(int s __unused,const struct ifaddrs * ifa)64 link_status(int s __unused, const struct ifaddrs *ifa)
65 {
66 /* XXX no const 'cuz LLADDR is defined wrong */
67 struct sockaddr_dl *sdl;
68 char *ether_format, *format_char;
69 struct ifreq ifr;
70 int n, rc, sock_hw;
71 static const u_char laggaddr[6] = {0};
72
73 sdl = (struct sockaddr_dl *) ifa->ifa_addr;
74 if (sdl == NULL || sdl->sdl_alen == 0)
75 return;
76
77 if ((sdl->sdl_type == IFT_ETHER || sdl->sdl_type == IFT_L2VLAN ||
78 sdl->sdl_type == IFT_BRIDGE) && sdl->sdl_alen == ETHER_ADDR_LEN) {
79 ether_format = ether_ntoa((struct ether_addr *)LLADDR(sdl));
80 if (f_ether != NULL && strcmp(f_ether, "dash") == 0) {
81 while ((format_char = strchr(ether_format, ':')) !=
82 NULL) {
83 *format_char = '-';
84 }
85 }
86 printf("\tether %s\n", ether_format);
87 } else {
88 n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0;
89 printf("\tlladdr %s\n", link_ntoa(sdl) + n);
90 }
91
92 /*
93 * Best-effort (i.e. failures are silent) to get original
94 * hardware address, as read by NIC driver at attach time. Only
95 * applies to Ethernet NICs (IFT_ETHER). However, laggX
96 * interfaces claim to be IFT_ETHER, and re-type their component
97 * Ethernet NICs as IFT_IEEE8023ADLAG. So, check for both. If
98 * the MAC is zeroed, then it's actually a lagg.
99 */
100 if ((sdl->sdl_type != IFT_ETHER &&
101 sdl->sdl_type != IFT_IEEE8023ADLAG) ||
102 sdl->sdl_alen != ETHER_ADDR_LEN)
103 return;
104
105 strncpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
106 memcpy(&ifr.ifr_addr, ifa->ifa_addr, sizeof(ifa->ifa_addr->sa_len));
107 ifr.ifr_addr.sa_family = AF_LOCAL;
108 if ((sock_hw = socket(AF_LOCAL, SOCK_DGRAM, 0)) < 0) {
109 warn("socket(AF_LOCAL,SOCK_DGRAM)");
110 return;
111 }
112 rc = ioctl(sock_hw, SIOCGHWADDR, &ifr);
113 close(sock_hw);
114 if (rc != 0)
115 return;
116
117 /*
118 * If this is definitely a lagg device or the hwaddr
119 * matches the link addr, don't bother.
120 */
121 if (memcmp(ifr.ifr_addr.sa_data, laggaddr, sdl->sdl_alen) == 0 ||
122 memcmp(ifr.ifr_addr.sa_data, LLADDR(sdl), sdl->sdl_alen) == 0)
123 goto pcp;
124
125 ether_format = ether_ntoa((const struct ether_addr *)
126 &ifr.ifr_addr.sa_data);
127 if (f_ether != NULL && strcmp(f_ether, "dash") == 0) {
128 for (format_char = strchr(ether_format, ':');
129 format_char != NULL;
130 format_char = strchr(ether_format, ':'))
131 *format_char = '-';
132 }
133 printf("\thwaddr %s\n", ether_format);
134
135 pcp:
136 if (ioctl(s, SIOCGLANPCP, (caddr_t)&ifr) == 0 &&
137 ifr.ifr_lan_pcp != IFNET_PCP_NONE)
138 printf("\tpcp %d\n", ifr.ifr_lan_pcp);
139 }
140
141 static void
link_getaddr(const char * addr,int which)142 link_getaddr(const char *addr, int which)
143 {
144 char *temp;
145 struct sockaddr_dl sdl;
146 struct sockaddr *sa = &link_ridreq.ifr_addr;
147
148 if (which != ADDR)
149 errx(1, "can't set link-level netmask or broadcast");
150 if (!strcmp(addr, "random")) {
151 sdl.sdl_len = sizeof(sdl);
152 sdl.sdl_alen = ETHER_ADDR_LEN;
153 sdl.sdl_nlen = 0;
154 sdl.sdl_family = AF_LINK;
155 #ifndef FSTACK
156 arc4random_buf(&sdl.sdl_data, ETHER_ADDR_LEN);
157 #else
158 RAND_bytes((void *)&sdl.sdl_data, ETHER_ADDR_LEN);
159 #endif
160 /* Non-multicast and claim it is locally administered. */
161 sdl.sdl_data[0] &= 0xfc;
162 sdl.sdl_data[0] |= 0x02;
163 } else {
164 if ((temp = malloc(strlen(addr) + 2)) == NULL)
165 errx(1, "malloc failed");
166 temp[0] = ':';
167 strcpy(temp + 1, addr);
168 sdl.sdl_len = sizeof(sdl);
169 link_addr(temp, &sdl);
170 free(temp);
171 }
172 if (sdl.sdl_alen > sizeof(sa->sa_data))
173 errx(1, "malformed link-level address");
174 sa->sa_family = AF_LINK;
175 sa->sa_len = sdl.sdl_alen;
176 bcopy(LLADDR(&sdl), sa->sa_data, sdl.sdl_alen);
177 }
178
179 static struct afswtch af_link = {
180 .af_name = "link",
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 };
187 static struct afswtch af_ether = {
188 .af_name = "ether",
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 static struct afswtch af_lladdr = {
196 .af_name = "lladdr",
197 .af_af = AF_LINK,
198 .af_status = link_status,
199 .af_getaddr = link_getaddr,
200 .af_aifaddr = SIOCSIFLLADDR,
201 .af_addreq = &link_ridreq,
202 };
203
204 static __constructor void
link_ctor(void)205 link_ctor(void)
206 {
207 af_register(&af_link);
208 af_register(&af_ether);
209 af_register(&af_lladdr);
210 }
211