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 * 4. 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 31static const char rcsid[] = 32 "$FreeBSD: stable/10/sbin/ifconfig/af_link.c 318430 2017-05-17 22:29:25Z rpokala $"; 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 53static struct ifreq link_ridreq; 54 55static void 56link_status(int s __unused, const struct ifaddrs *ifa) 57{ 58 /* XXX no const 'cuz LLADDR is defined wrong */ 59 struct sockaddr_dl *sdl = (struct sockaddr_dl *) ifa->ifa_addr; 60 61 if (sdl != NULL && sdl->sdl_alen > 0) { 62 if ((sdl->sdl_type == IFT_ETHER || 63 sdl->sdl_type == IFT_L2VLAN || 64 sdl->sdl_type == IFT_BRIDGE) && 65 sdl->sdl_alen == ETHER_ADDR_LEN) 66 printf("\tether %s\n", 67 ether_ntoa((struct ether_addr *)LLADDR(sdl))); 68 else { 69 int n = sdl->sdl_nlen > 0 ? sdl->sdl_nlen + 1 : 0; 70 71 printf("\tlladdr %s\n", link_ntoa(sdl) + n); 72 } 73 /* Best-effort (i.e. failures are silent) to get original 74 * hardware address, as read by NIC driver at attach time. Only 75 * applies to Ethernet NICs (IFT_ETHER). However, laggX 76 * interfaces claim to be IFT_ETHER, and re-type their component 77 * Ethernet NICs as IFT_IEEE8023ADLAG. So, check for both. If 78 * the MAC is zeroed, then it's actually a lagg. 79 */ 80 if ((sdl->sdl_type == IFT_ETHER || 81 sdl->sdl_type == IFT_IEEE8023ADLAG) && 82 sdl->sdl_alen == ETHER_ADDR_LEN) { 83 struct ifreq ifr; 84 int sock_hw; 85 int rc; 86 static const u_char laggaddr[6] = {0}; 87 88 strncpy(ifr.ifr_name, ifa->ifa_name, 89 sizeof(ifr.ifr_name)); 90 memcpy(&ifr.ifr_addr, ifa->ifa_addr, 91 sizeof(ifa->ifa_addr->sa_len)); 92 ifr.ifr_addr.sa_family = AF_LOCAL; 93 if ((sock_hw = socket(AF_LOCAL, SOCK_DGRAM, 0)) < 0) { 94 warn("socket(AF_LOCAL,SOCK_DGRAM)"); 95 return; 96 } 97 rc = ioctl(sock_hw, SIOCGHWADDR, &ifr); 98 close(sock_hw); 99 if (rc != 0) { 100 return; 101 } 102 if (memcmp(ifr.ifr_addr.sa_data, laggaddr, sdl->sdl_alen) == 0) { 103 return; 104 } 105 printf("\thwaddr %s\n", ether_ntoa((const struct ether_addr *) 106 &ifr.ifr_addr.sa_data)); 107 } 108 } 109} 110 111static void 112link_getaddr(const char *addr, int which) 113{ 114 char *temp; 115 struct sockaddr_dl sdl; 116 struct sockaddr *sa = &link_ridreq.ifr_addr; 117 118 if (which != ADDR) 119 errx(1, "can't set link-level netmask or broadcast"); 120 if ((temp = malloc(strlen(addr) + 2)) == NULL) 121 errx(1, "malloc failed"); 122 temp[0] = ':'; 123 strcpy(temp + 1, addr); 124 sdl.sdl_len = sizeof(sdl); 125 link_addr(temp, &sdl); 126 free(temp); 127 if (sdl.sdl_alen > sizeof(sa->sa_data)) 128 errx(1, "malformed link-level address"); 129 sa->sa_family = AF_LINK; 130 sa->sa_len = sdl.sdl_alen; 131 bcopy(LLADDR(&sdl), sa->sa_data, sdl.sdl_alen); 132} 133 134static struct afswtch af_link = { 135 .af_name = "link", 136 .af_af = AF_LINK, 137 .af_status = link_status, 138 .af_getaddr = link_getaddr, 139 .af_aifaddr = SIOCSIFLLADDR, 140 .af_addreq = &link_ridreq, 141}; 142static struct afswtch af_ether = { 143 .af_name = "ether", 144 .af_af = AF_LINK, 145 .af_status = link_status, 146 .af_getaddr = link_getaddr, 147 .af_aifaddr = SIOCSIFLLADDR, 148 .af_addreq = &link_ridreq, 149}; 150static struct afswtch af_lladdr = { 151 .af_name = "lladdr", 152 .af_af = AF_LINK, 153 .af_status = link_status, 154 .af_getaddr = link_getaddr, 155 .af_aifaddr = SIOCSIFLLADDR, 156 .af_addreq = &link_ridreq, 157}; 158 159static __constructor void 160link_ctor(void) 161{ 162 af_register(&af_link); 163 af_register(&af_ether); 164 af_register(&af_lladdr); 165} 166