1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char rcsid[] = 32 "$FreeBSD$"; 33 #endif /* not lint */ 34 35 #include <sys/types.h> 36 #include <sys/ioctl.h> 37 #include <sys/socket.h> 38 #include <net/if.h> 39 40 #include <err.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <ifaddrs.h> 45 #include <unistd.h> 46 47 #include <net/if_dl.h> 48 #include <net/if_types.h> 49 #include <net/ethernet.h> 50 51 #include "ifconfig.h" 52 53 static struct ifreq link_ridreq; 54 55 extern char *f_ether; 56 57 static void 58 link_status(int s __unused, const struct ifaddrs *ifa) 59 { 60 /* XXX no const 'cuz LLADDR is defined wrong */ 61 struct sockaddr_dl *sdl = (struct sockaddr_dl *) ifa->ifa_addr; 62 char *ether_format, *format_char; 63 64 if (sdl != NULL && sdl->sdl_alen > 0) { 65 if ((sdl->sdl_type == IFT_ETHER || 66 sdl->sdl_type == IFT_L2VLAN || 67 sdl->sdl_type == IFT_BRIDGE) && 68 sdl->sdl_alen == ETHER_ADDR_LEN) { 69 ether_format = ether_ntoa((struct ether_addr *)LLADDR(sdl)); 70 if (f_ether != NULL && strcmp(f_ether, "dash") == 0) { 71 for (format_char = strchr(ether_format, ':'); 72 format_char != NULL; 73 format_char = strchr(ether_format, ':')) 74 *format_char = '-'; 75 } 76 printf("\tether %s\n", ether_format); 77 } else { 78 int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0; 79 80 printf("\tlladdr %s\n", link_ntoa(sdl) + n); 81 } 82 /* Best-effort (i.e. failures are silent) to get original 83 * hardware address, as read by NIC driver at attach time. Only 84 * applies to Ethernet NICs (IFT_ETHER). However, laggX 85 * interfaces claim to be IFT_ETHER, and re-type their component 86 * Ethernet NICs as IFT_IEEE8023ADLAG. So, check for both. If 87 * the MAC is zeroed, then it's actually a lagg. 88 */ 89 if ((sdl->sdl_type == IFT_ETHER || 90 sdl->sdl_type == IFT_IEEE8023ADLAG) && 91 sdl->sdl_alen == ETHER_ADDR_LEN) { 92 struct ifreq ifr; 93 int sock_hw; 94 int rc; 95 static const u_char laggaddr[6] = {0}; 96 97 strncpy(ifr.ifr_name, ifa->ifa_name, 98 sizeof(ifr.ifr_name)); 99 memcpy(&ifr.ifr_addr, ifa->ifa_addr, 100 sizeof(ifa->ifa_addr->sa_len)); 101 ifr.ifr_addr.sa_family = AF_LOCAL; 102 if ((sock_hw = socket(AF_LOCAL, SOCK_DGRAM, 0)) < 0) { 103 warn("socket(AF_LOCAL,SOCK_DGRAM)"); 104 return; 105 } 106 rc = ioctl(sock_hw, SIOCGHWADDR, &ifr); 107 close(sock_hw); 108 if (rc != 0) { 109 return; 110 } 111 if (memcmp(ifr.ifr_addr.sa_data, laggaddr, sdl->sdl_alen) == 0) { 112 return; 113 } 114 ether_format = ether_ntoa((const struct ether_addr *) 115 &ifr.ifr_addr.sa_data); 116 if (f_ether != NULL && strcmp(f_ether, "dash") == 0) { 117 for (format_char = strchr(ether_format, ':'); 118 format_char != NULL; 119 format_char = strchr(ether_format, ':')) 120 *format_char = '-'; 121 } 122 printf("\thwaddr %s\n", ether_format); 123 } 124 } 125 } 126 127 static void 128 link_getaddr(const char *addr, int which) 129 { 130 char *temp; 131 struct sockaddr_dl sdl; 132 struct sockaddr *sa = &link_ridreq.ifr_addr; 133 134 if (which != ADDR) 135 errx(1, "can't set link-level netmask or broadcast"); 136 if (!strcmp(addr, "random")) { 137 sdl.sdl_len = sizeof(sdl); 138 sdl.sdl_alen = ETHER_ADDR_LEN; 139 sdl.sdl_nlen = 0; 140 sdl.sdl_family = AF_LINK; 141 arc4random_buf(&sdl.sdl_data, ETHER_ADDR_LEN); 142 /* Non-multicast and claim it is locally administered. */ 143 sdl.sdl_data[0] &= 0xfc; 144 sdl.sdl_data[0] |= 0x02; 145 } else { 146 if ((temp = malloc(strlen(addr) + 2)) == NULL) 147 errx(1, "malloc failed"); 148 temp[0] = ':'; 149 strcpy(temp + 1, addr); 150 sdl.sdl_len = sizeof(sdl); 151 link_addr(temp, &sdl); 152 free(temp); 153 } 154 if (sdl.sdl_alen > sizeof(sa->sa_data)) 155 errx(1, "malformed link-level address"); 156 sa->sa_family = AF_LINK; 157 sa->sa_len = sdl.sdl_alen; 158 bcopy(LLADDR(&sdl), sa->sa_data, sdl.sdl_alen); 159 } 160 161 static struct afswtch af_link = { 162 .af_name = "link", 163 .af_af = AF_LINK, 164 .af_status = link_status, 165 .af_getaddr = link_getaddr, 166 .af_aifaddr = SIOCSIFLLADDR, 167 .af_addreq = &link_ridreq, 168 }; 169 static struct afswtch af_ether = { 170 .af_name = "ether", 171 .af_af = AF_LINK, 172 .af_status = link_status, 173 .af_getaddr = link_getaddr, 174 .af_aifaddr = SIOCSIFLLADDR, 175 .af_addreq = &link_ridreq, 176 }; 177 static struct afswtch af_lladdr = { 178 .af_name = "lladdr", 179 .af_af = AF_LINK, 180 .af_status = link_status, 181 .af_getaddr = link_getaddr, 182 .af_aifaddr = SIOCSIFLLADDR, 183 .af_addreq = &link_ridreq, 184 }; 185 186 static __constructor void 187 link_ctor(void) 188 { 189 af_register(&af_link); 190 af_register(&af_ether); 191 af_register(&af_lladdr); 192 } 193