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 #include "ifconfig.h" 54 55 static struct ifreq link_ridreq; 56 57 extern char *f_ether; 58 59 static void 60 link_status(int s __unused, const struct ifaddrs *ifa) 61 { 62 /* XXX no const 'cuz LLADDR is defined wrong */ 63 struct sockaddr_dl *sdl = (struct sockaddr_dl *) ifa->ifa_addr; 64 char *ether_format, *format_char; 65 66 if (sdl != NULL && sdl->sdl_alen > 0) { 67 if ((sdl->sdl_type == IFT_ETHER || 68 sdl->sdl_type == IFT_L2VLAN || 69 sdl->sdl_type == IFT_BRIDGE) && 70 sdl->sdl_alen == ETHER_ADDR_LEN) { 71 ether_format = ether_ntoa((struct ether_addr *)LLADDR(sdl)); 72 if (f_ether != NULL && strcmp(f_ether, "dash") == 0) { 73 for (format_char = strchr(ether_format, ':'); 74 format_char != NULL; 75 format_char = strchr(ether_format, ':')) 76 *format_char = '-'; 77 } 78 printf("\tether %s\n", ether_format); 79 } else { 80 int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0; 81 82 printf("\tlladdr %s\n", link_ntoa(sdl) + n); 83 } 84 /* Best-effort (i.e. failures are silent) to get original 85 * hardware address, as read by NIC driver at attach time. Only 86 * applies to Ethernet NICs (IFT_ETHER). However, laggX 87 * interfaces claim to be IFT_ETHER, and re-type their component 88 * Ethernet NICs as IFT_IEEE8023ADLAG. So, check for both. If 89 * the MAC is zeroed, then it's actually a lagg. 90 */ 91 if ((sdl->sdl_type == IFT_ETHER || 92 sdl->sdl_type == IFT_IEEE8023ADLAG) && 93 sdl->sdl_alen == ETHER_ADDR_LEN) { 94 struct ifreq ifr; 95 int sock_hw; 96 int rc; 97 static const u_char laggaddr[6] = {0}; 98 99 strncpy(ifr.ifr_name, ifa->ifa_name, 100 sizeof(ifr.ifr_name)); 101 memcpy(&ifr.ifr_addr, ifa->ifa_addr, 102 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 /* 115 * If this is definitely a lagg device or the hwaddr 116 * matches the link addr, don't bother. 117 */ 118 if (memcmp(ifr.ifr_addr.sa_data, laggaddr, 119 sdl->sdl_alen) == 0 || 120 memcmp(ifr.ifr_addr.sa_data, LLADDR(sdl), 121 sdl->sdl_alen) == 0) { 122 return; 123 } 124 ether_format = ether_ntoa((const struct ether_addr *) 125 &ifr.ifr_addr.sa_data); 126 if (f_ether != NULL && strcmp(f_ether, "dash") == 0) { 127 for (format_char = strchr(ether_format, ':'); 128 format_char != NULL; 129 format_char = strchr(ether_format, ':')) 130 *format_char = '-'; 131 } 132 printf("\thwaddr %s\n", ether_format); 133 } 134 } 135 } 136 137 static void 138 link_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 } 170 171 static 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 }; 179 static 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 }; 187 static 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 }; 195 196 static __constructor void 197 link_ctor(void) 198 { 199 af_register(&af_link); 200 af_register(&af_ether); 201 af_register(&af_lladdr); 202 } 203