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 #include <sys/types.h>
33 #include <sys/ioctl.h>
34 #include <sys/socket.h>
35 #include <net/if.h>
36
37 #include <err.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <ifaddrs.h>
42 #include <unistd.h>
43
44 #include <net/if_dl.h>
45 #include <net/if_types.h>
46 #include <net/ethernet.h>
47
48 #include "ifconfig.h"
49 #include "ifconfig_netlink.h"
50
51 static struct ifreq link_ridreq;
52
53 extern char *f_ether;
54
55 static void
print_ether(const struct ether_addr * addr,const char * prefix)56 print_ether(const struct ether_addr *addr, const char *prefix)
57 {
58 char *ether_format = ether_ntoa(addr);
59
60 if (f_ether != NULL) {
61 if (strcmp(f_ether, "dash") == 0) {
62 char *format_char;
63
64 while ((format_char = strchr(ether_format, ':')) != NULL) {
65 *format_char = '-';
66 }
67 } else if (strcmp(f_ether, "dotted") == 0) {
68 /* Indices 0 and 1 is kept as is. */
69 ether_format[ 2] = ether_format[ 3];
70 ether_format[ 3] = ether_format[ 4];
71 ether_format[ 4] = '.';
72 ether_format[ 5] = ether_format[ 6];
73 ether_format[ 6] = ether_format[ 7];
74 ether_format[ 7] = ether_format[ 9];
75 ether_format[ 8] = ether_format[10];
76 ether_format[ 9] = '.';
77 ether_format[10] = ether_format[12];
78 ether_format[11] = ether_format[13];
79 ether_format[12] = ether_format[15];
80 ether_format[13] = ether_format[16];
81 ether_format[14] = '\0';
82 }
83 }
84 printf("\t%s %s\n", prefix, ether_format);
85 }
86
87 static void
print_lladdr(struct sockaddr_dl * sdl)88 print_lladdr(struct sockaddr_dl *sdl)
89 {
90 if (match_ether(sdl)) {
91 print_ether((struct ether_addr *)LLADDR(sdl), "ether");
92 } else {
93 int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0;
94 printf("\tlladdr %s\n", link_ntoa(sdl) + n);
95 }
96 }
97
98 static void
print_pcp(if_ctx * ctx)99 print_pcp(if_ctx *ctx)
100 {
101 struct ifreq ifr = {};
102
103 if (ioctl_ctx_ifr(ctx, SIOCGLANPCP, &ifr) == 0 &&
104 ifr.ifr_lan_pcp != IFNET_PCP_NONE)
105 printf("\tpcp %d\n", ifr.ifr_lan_pcp);
106 }
107
108 #ifdef WITHOUT_NETLINK
109 static void
link_status(if_ctx * ctx,const struct ifaddrs * ifa)110 link_status(if_ctx *ctx, const struct ifaddrs *ifa)
111 {
112 /* XXX no const 'cuz LLADDR is defined wrong */
113 struct sockaddr_dl *sdl;
114 struct ifreq ifr;
115 int rc, sock_hw;
116 static const u_char laggaddr[6] = {0};
117
118 sdl = satosdl(ifa->ifa_addr);
119 if (sdl == NULL || sdl->sdl_alen == 0)
120 return;
121
122 print_lladdr(sdl);
123
124 /*
125 * Best-effort (i.e. failures are silent) to get original
126 * hardware address, as read by NIC driver at attach time. Only
127 * applies to Ethernet NICs (IFT_ETHER). However, laggX
128 * interfaces claim to be IFT_ETHER, and re-type their component
129 * Ethernet NICs as IFT_IEEE8023ADLAG. So, check for both. If
130 * the MAC is zeroed, then it's actually a lagg.
131 */
132 if ((sdl->sdl_type != IFT_ETHER &&
133 sdl->sdl_type != IFT_IEEE8023ADLAG) ||
134 sdl->sdl_alen != ETHER_ADDR_LEN)
135 return;
136
137 strncpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
138 memcpy(&ifr.ifr_addr, ifa->ifa_addr, sizeof(ifa->ifa_addr->sa_len));
139 ifr.ifr_addr.sa_family = AF_LOCAL;
140 if ((sock_hw = socket(AF_LOCAL, SOCK_DGRAM, 0)) < 0) {
141 warn("socket(AF_LOCAL,SOCK_DGRAM)");
142 return;
143 }
144 rc = ioctl(sock_hw, SIOCGHWADDR, &ifr);
145 close(sock_hw);
146 if (rc != 0)
147 return;
148
149 /*
150 * If this is definitely a lagg device or the hwaddr
151 * matches the link addr, don't bother.
152 */
153 if (memcmp(ifr.ifr_addr.sa_data, laggaddr, sdl->sdl_alen) == 0 ||
154 memcmp(ifr.ifr_addr.sa_data, LLADDR(sdl), sdl->sdl_alen) == 0)
155 goto pcp;
156
157 print_ether((const struct ether_addr *)&ifr.ifr_addr.sa_data, "hwaddr");
158 pcp:
159 print_pcp(ctx);
160 }
161
162 #else
163
164 static void
link_status_nl(if_ctx * ctx,if_link_t * link,if_addr_t * ifa __unused)165 link_status_nl(if_ctx *ctx, if_link_t *link, if_addr_t *ifa __unused)
166 {
167 if (link->ifla_address != NULL) {
168 struct sockaddr_dl sdl = {
169 .sdl_len = sizeof(struct sockaddr_dl),
170 .sdl_family = AF_LINK,
171 .sdl_type = convert_iftype(link->ifi_type),
172 .sdl_alen = NLA_DATA_LEN(link->ifla_address),
173 };
174 memcpy(LLADDR(&sdl), NLA_DATA(link->ifla_address), sdl.sdl_alen);
175 print_lladdr(&sdl);
176
177 if (link->iflaf_orig_hwaddr != NULL) {
178 struct nlattr *hwaddr = link->iflaf_orig_hwaddr;
179
180 if (memcmp(NLA_DATA(hwaddr), NLA_DATA(link->ifla_address), sdl.sdl_alen))
181 print_ether((struct ether_addr *)NLA_DATA(hwaddr), "hwaddr");
182 }
183 }
184 if (convert_iftype(link->ifi_type) == IFT_ETHER)
185 print_pcp(ctx);
186 }
187 #endif
188
189 static void
link_getaddr(const char * addr,int which)190 link_getaddr(const char *addr, int which)
191 {
192 char *temp;
193 struct sockaddr_dl sdl;
194 struct sockaddr *sa = &link_ridreq.ifr_addr;
195
196 if (which != ADDR)
197 errx(1, "can't set link-level netmask or broadcast");
198 if (!strcmp(addr, "random")) {
199 sdl.sdl_len = sizeof(sdl);
200 sdl.sdl_alen = ETHER_ADDR_LEN;
201 sdl.sdl_nlen = 0;
202 sdl.sdl_family = AF_LINK;
203 arc4random_buf(&sdl.sdl_data, ETHER_ADDR_LEN);
204 /* Non-multicast and claim it is locally administered. */
205 sdl.sdl_data[0] &= 0xfc;
206 sdl.sdl_data[0] |= 0x02;
207 } else {
208 if ((temp = malloc(strlen(addr) + 2)) == NULL)
209 errx(1, "malloc failed");
210 temp[0] = ':';
211 strcpy(temp + 1, addr);
212 sdl.sdl_len = sizeof(sdl);
213 link_addr(temp, &sdl);
214 free(temp);
215 }
216 if (sdl.sdl_alen > sizeof(sa->sa_data))
217 errx(1, "malformed link-level address");
218 sa->sa_family = AF_LINK;
219 sa->sa_len = sdl.sdl_alen;
220 bcopy(LLADDR(&sdl), sa->sa_data, sdl.sdl_alen);
221 }
222
223 static struct afswtch af_link = {
224 .af_name = "link",
225 .af_af = AF_LINK,
226 #ifdef WITHOUT_NETLINK
227 .af_status = link_status,
228 #else
229 .af_status = link_status_nl,
230 #endif
231 .af_getaddr = link_getaddr,
232 .af_aifaddr = SIOCSIFLLADDR,
233 .af_addreq = &link_ridreq,
234 .af_exec = af_exec_ioctl,
235 };
236 static struct afswtch af_ether = {
237 .af_name = "ether",
238 .af_af = AF_LINK,
239 #ifdef WITHOUT_NETLINK
240 .af_status = link_status,
241 #else
242 .af_status = link_status_nl,
243 #endif
244 .af_getaddr = link_getaddr,
245 .af_aifaddr = SIOCSIFLLADDR,
246 .af_addreq = &link_ridreq,
247 .af_exec = af_exec_ioctl,
248 };
249 static struct afswtch af_lladdr = {
250 .af_name = "lladdr",
251 .af_af = AF_LINK,
252 #ifdef WITHOUT_NETLINK
253 .af_status = link_status,
254 #else
255 .af_status = link_status_nl,
256 #endif
257 .af_getaddr = link_getaddr,
258 .af_aifaddr = SIOCSIFLLADDR,
259 .af_addreq = &link_ridreq,
260 .af_exec = af_exec_ioctl,
261 };
262
263 static __constructor void
link_ctor(void)264 link_ctor(void)
265 {
266 af_register(&af_link);
267 af_register(&af_ether);
268 af_register(&af_lladdr);
269 }
270