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 print_ether(const struct ether_addr *addr, const char *prefix) 61 { 62 char *ether_format = ether_ntoa(addr); 63 64 if (f_ether != NULL && strcmp(f_ether, "dash") == 0) { 65 char *format_char; 66 67 while ((format_char = strchr(ether_format, ':')) != NULL) { 68 *format_char = '-'; 69 } 70 } 71 printf("\t%s %s\n", prefix, ether_format); 72 } 73 74 static void 75 print_lladdr(struct sockaddr_dl *sdl) 76 { 77 if (match_ether(sdl)) { 78 print_ether((struct ether_addr *)LLADDR(sdl), "ether"); 79 } else { 80 int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0; 81 printf("\tlladdr %s\n", link_ntoa(sdl) + n); 82 } 83 } 84 85 static void 86 print_pcp(int s) 87 { 88 if (ioctl(s, SIOCGLANPCP, (caddr_t)&ifr) == 0 && 89 ifr.ifr_lan_pcp != IFNET_PCP_NONE) 90 printf("\tpcp %d\n", ifr.ifr_lan_pcp); 91 } 92 93 static void 94 link_status(int s __unused, const struct ifaddrs *ifa) 95 { 96 /* XXX no const 'cuz LLADDR is defined wrong */ 97 struct sockaddr_dl *sdl; 98 struct ifreq ifr; 99 int rc, sock_hw; 100 static const u_char laggaddr[6] = {0}; 101 102 sdl = (struct sockaddr_dl *) ifa->ifa_addr; 103 if (sdl == NULL || sdl->sdl_alen == 0) 104 return; 105 106 print_lladdr(sdl); 107 108 /* 109 * Best-effort (i.e. failures are silent) to get original 110 * hardware address, as read by NIC driver at attach time. Only 111 * applies to Ethernet NICs (IFT_ETHER). However, laggX 112 * interfaces claim to be IFT_ETHER, and re-type their component 113 * Ethernet NICs as IFT_IEEE8023ADLAG. So, check for both. If 114 * the MAC is zeroed, then it's actually a lagg. 115 */ 116 if ((sdl->sdl_type != IFT_ETHER && 117 sdl->sdl_type != IFT_IEEE8023ADLAG) || 118 sdl->sdl_alen != ETHER_ADDR_LEN) 119 return; 120 121 strncpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name)); 122 memcpy(&ifr.ifr_addr, ifa->ifa_addr, sizeof(ifa->ifa_addr->sa_len)); 123 ifr.ifr_addr.sa_family = AF_LOCAL; 124 if ((sock_hw = socket(AF_LOCAL, SOCK_DGRAM, 0)) < 0) { 125 warn("socket(AF_LOCAL,SOCK_DGRAM)"); 126 return; 127 } 128 rc = ioctl(sock_hw, SIOCGHWADDR, &ifr); 129 close(sock_hw); 130 if (rc != 0) 131 return; 132 133 /* 134 * If this is definitely a lagg device or the hwaddr 135 * matches the link addr, don't bother. 136 */ 137 if (memcmp(ifr.ifr_addr.sa_data, laggaddr, sdl->sdl_alen) == 0 || 138 memcmp(ifr.ifr_addr.sa_data, LLADDR(sdl), sdl->sdl_alen) == 0) 139 goto pcp; 140 141 print_ether((const struct ether_addr *)&ifr.ifr_addr.sa_data, "hwaddr"); 142 pcp: 143 print_pcp(s); 144 } 145 146 static void 147 link_getaddr(const char *addr, int which) 148 { 149 char *temp; 150 struct sockaddr_dl sdl; 151 struct sockaddr *sa = &link_ridreq.ifr_addr; 152 153 if (which != ADDR) 154 errx(1, "can't set link-level netmask or broadcast"); 155 if (!strcmp(addr, "random")) { 156 sdl.sdl_len = sizeof(sdl); 157 sdl.sdl_alen = ETHER_ADDR_LEN; 158 sdl.sdl_nlen = 0; 159 sdl.sdl_family = AF_LINK; 160 arc4random_buf(&sdl.sdl_data, ETHER_ADDR_LEN); 161 /* Non-multicast and claim it is locally administered. */ 162 sdl.sdl_data[0] &= 0xfc; 163 sdl.sdl_data[0] |= 0x02; 164 } else { 165 if ((temp = malloc(strlen(addr) + 2)) == NULL) 166 errx(1, "malloc failed"); 167 temp[0] = ':'; 168 strcpy(temp + 1, addr); 169 sdl.sdl_len = sizeof(sdl); 170 link_addr(temp, &sdl); 171 free(temp); 172 } 173 if (sdl.sdl_alen > sizeof(sa->sa_data)) 174 errx(1, "malformed link-level address"); 175 sa->sa_family = AF_LINK; 176 sa->sa_len = sdl.sdl_alen; 177 bcopy(LLADDR(&sdl), sa->sa_data, sdl.sdl_alen); 178 } 179 180 static struct afswtch af_link = { 181 .af_name = "link", 182 .af_af = AF_LINK, 183 .af_status = link_status, 184 .af_getaddr = link_getaddr, 185 .af_aifaddr = SIOCSIFLLADDR, 186 .af_addreq = &link_ridreq, 187 }; 188 static struct afswtch af_ether = { 189 .af_name = "ether", 190 .af_af = AF_LINK, 191 .af_status = link_status, 192 .af_getaddr = link_getaddr, 193 .af_aifaddr = SIOCSIFLLADDR, 194 .af_addreq = &link_ridreq, 195 }; 196 static struct afswtch af_lladdr = { 197 .af_name = "lladdr", 198 .af_af = AF_LINK, 199 .af_status = link_status, 200 .af_getaddr = link_getaddr, 201 .af_aifaddr = SIOCSIFLLADDR, 202 .af_addreq = &link_ridreq, 203 }; 204 205 static __constructor void 206 link_ctor(void) 207 { 208 af_register(&af_link); 209 af_register(&af_ether); 210 af_register(&af_lladdr); 211 } 212