[821] | 1 | /*
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| 2 | * iplink.c "ip link".
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| 3 | *
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| 4 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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| 5 | *
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| 6 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 7 | */
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| 8 |
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| 9 | #include "libbb.h"
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| 10 |
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| 11 | #include <sys/ioctl.h>
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| 12 | #include <sys/socket.h>
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| 13 |
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| 14 | #include <errno.h>
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| 15 | #include <string.h>
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| 16 | #include <unistd.h>
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| 17 |
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| 18 | #include <net/if.h>
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| 19 | #include <net/if_packet.h>
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| 20 | #include <netpacket/packet.h>
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| 21 |
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| 22 | #include <net/ethernet.h>
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| 23 |
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| 24 | #include "rt_names.h"
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| 25 | #include "utils.h"
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| 26 | #include "ip_common.h"
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| 27 |
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| 28 | /* take from linux/sockios.h */
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| 29 | #define SIOCSIFNAME 0x8923 /* set interface name */
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| 30 |
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| 31 | static int do_link;
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| 32 |
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| 33 | static int on_off(char *msg)
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| 34 | {
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| 35 | bb_error_msg("Error: argument of \"%s\" must be \"on\" or \"off\"", msg);
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| 36 | return -1;
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| 37 | }
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| 38 |
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| 39 | static int get_ctl_fd(void)
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| 40 | {
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| 41 | int s_errno;
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| 42 | int fd;
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| 43 |
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| 44 | fd = socket(PF_INET, SOCK_DGRAM, 0);
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| 45 | if (fd >= 0)
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| 46 | return fd;
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| 47 | s_errno = errno;
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| 48 | fd = socket(PF_PACKET, SOCK_DGRAM, 0);
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| 49 | if (fd >= 0)
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| 50 | return fd;
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| 51 | fd = socket(PF_INET6, SOCK_DGRAM, 0);
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| 52 | if (fd >= 0)
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| 53 | return fd;
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| 54 | errno = s_errno;
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| 55 | perror("Cannot create control socket");
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| 56 | return -1;
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| 57 | }
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| 58 |
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| 59 | static int do_chflags(char *dev, __u32 flags, __u32 mask)
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| 60 | {
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| 61 | struct ifreq ifr;
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| 62 | int fd;
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| 63 | int err;
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| 64 |
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| 65 | strcpy(ifr.ifr_name, dev);
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| 66 | fd = get_ctl_fd();
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| 67 | if (fd < 0)
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| 68 | return -1;
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| 69 | err = ioctl(fd, SIOCGIFFLAGS, &ifr);
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| 70 | if (err) {
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| 71 | perror("SIOCGIFFLAGS");
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| 72 | close(fd);
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| 73 | return -1;
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| 74 | }
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| 75 | if ((ifr.ifr_flags^flags)&mask) {
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| 76 | ifr.ifr_flags &= ~mask;
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| 77 | ifr.ifr_flags |= mask&flags;
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| 78 | err = ioctl(fd, SIOCSIFFLAGS, &ifr);
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| 79 | if (err)
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| 80 | perror("SIOCSIFFLAGS");
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| 81 | }
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| 82 | close(fd);
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| 83 | return err;
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| 84 | }
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| 85 |
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| 86 | static int do_changename(char *dev, char *newdev)
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| 87 | {
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| 88 | struct ifreq ifr;
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| 89 | int fd;
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| 90 | int err;
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| 91 |
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| 92 | strcpy(ifr.ifr_name, dev);
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| 93 | strcpy(ifr.ifr_newname, newdev);
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| 94 | fd = get_ctl_fd();
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| 95 | if (fd < 0)
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| 96 | return -1;
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| 97 | err = ioctl(fd, SIOCSIFNAME, &ifr);
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| 98 | if (err) {
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| 99 | perror("SIOCSIFNAME");
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| 100 | close(fd);
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| 101 | return -1;
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| 102 | }
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| 103 | close(fd);
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| 104 | return err;
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| 105 | }
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| 106 |
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| 107 | static int set_qlen(char *dev, int qlen)
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| 108 | {
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| 109 | struct ifreq ifr;
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| 110 | int s;
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| 111 |
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| 112 | s = get_ctl_fd();
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| 113 | if (s < 0)
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| 114 | return -1;
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| 115 |
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| 116 | memset(&ifr, 0, sizeof(ifr));
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| 117 | strcpy(ifr.ifr_name, dev);
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| 118 | ifr.ifr_qlen = qlen;
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| 119 | if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
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| 120 | perror("SIOCSIFXQLEN");
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| 121 | close(s);
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| 122 | return -1;
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| 123 | }
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| 124 | close(s);
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| 125 |
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| 126 | return 0;
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| 127 | }
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| 128 |
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| 129 | static int set_mtu(char *dev, int mtu)
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| 130 | {
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| 131 | struct ifreq ifr;
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| 132 | int s;
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| 133 |
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| 134 | s = get_ctl_fd();
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| 135 | if (s < 0)
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| 136 | return -1;
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| 137 |
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| 138 | memset(&ifr, 0, sizeof(ifr));
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| 139 | strcpy(ifr.ifr_name, dev);
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| 140 | ifr.ifr_mtu = mtu;
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| 141 | if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
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| 142 | perror("SIOCSIFMTU");
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| 143 | close(s);
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| 144 | return -1;
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| 145 | }
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| 146 | close(s);
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| 147 |
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| 148 | return 0;
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| 149 | }
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| 150 |
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| 151 | static int get_address(char *dev, int *htype)
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| 152 | {
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| 153 | struct ifreq ifr;
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| 154 | struct sockaddr_ll me;
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| 155 | socklen_t alen;
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| 156 | int s;
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| 157 |
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| 158 | s = socket(PF_PACKET, SOCK_DGRAM, 0);
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| 159 | if (s < 0) {
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| 160 | perror("socket(PF_PACKET)");
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| 161 | return -1;
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| 162 | }
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| 163 |
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| 164 | memset(&ifr, 0, sizeof(ifr));
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| 165 | strcpy(ifr.ifr_name, dev);
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| 166 | if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
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| 167 | perror("SIOCGIFINDEX");
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| 168 | close(s);
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| 169 | return -1;
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| 170 | }
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| 171 |
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| 172 | memset(&me, 0, sizeof(me));
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| 173 | me.sll_family = AF_PACKET;
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| 174 | me.sll_ifindex = ifr.ifr_ifindex;
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| 175 | me.sll_protocol = htons(ETH_P_LOOP);
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| 176 | if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
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| 177 | perror("bind");
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| 178 | close(s);
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| 179 | return -1;
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| 180 | }
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| 181 |
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| 182 | alen = sizeof(me);
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| 183 | if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
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| 184 | perror("getsockname");
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| 185 | close(s);
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| 186 | return -1;
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| 187 | }
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| 188 | close(s);
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| 189 | *htype = me.sll_hatype;
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| 190 | return me.sll_halen;
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| 191 | }
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| 192 |
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| 193 | static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
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| 194 | {
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| 195 | int alen;
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| 196 |
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| 197 | memset(ifr, 0, sizeof(*ifr));
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| 198 | strcpy(ifr->ifr_name, dev);
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| 199 | ifr->ifr_hwaddr.sa_family = hatype;
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| 200 | alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
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| 201 | if (alen < 0)
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| 202 | return -1;
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| 203 | if (alen != halen) {
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| 204 | bb_error_msg("Wrong address (%s) length: expected %d bytes", lla, halen);
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| 205 | return -1;
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| 206 | }
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| 207 | return 0;
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| 208 | }
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| 209 |
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| 210 | static int set_address(struct ifreq *ifr, int brd)
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| 211 | {
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| 212 | int s;
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| 213 |
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| 214 | s = get_ctl_fd();
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| 215 | if (s < 0)
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| 216 | return -1;
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| 217 | if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
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| 218 | perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
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| 219 | close(s);
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| 220 | return -1;
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| 221 | }
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| 222 | close(s);
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| 223 | return 0;
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| 224 | }
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| 225 |
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| 226 |
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| 227 | static int do_set(int argc, char **argv)
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| 228 | {
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| 229 | char *dev = NULL;
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| 230 | __u32 mask = 0;
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| 231 | __u32 flags = 0;
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| 232 | int qlen = -1;
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| 233 | int mtu = -1;
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| 234 | char *newaddr = NULL;
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| 235 | char *newbrd = NULL;
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| 236 | struct ifreq ifr0, ifr1;
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| 237 | char *newname = NULL;
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| 238 | int htype, halen;
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| 239 |
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| 240 | while (argc > 0) {
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| 241 | if (strcmp(*argv, "up") == 0) {
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| 242 | mask |= IFF_UP;
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| 243 | flags |= IFF_UP;
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| 244 | } else if (strcmp(*argv, "down") == 0) {
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| 245 | mask |= IFF_UP;
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| 246 | flags &= ~IFF_UP;
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| 247 | } else if (strcmp(*argv, "name") == 0) {
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| 248 | NEXT_ARG();
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| 249 | newname = *argv;
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| 250 | } else if (strcmp(*argv, "mtu") == 0) {
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| 251 | NEXT_ARG();
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| 252 | if (mtu != -1)
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| 253 | duparg("mtu", *argv);
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| 254 | if (get_integer(&mtu, *argv, 0))
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| 255 | invarg(*argv, "mtu");
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| 256 | } else if (strcmp(*argv, "multicast") == 0) {
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| 257 | NEXT_ARG();
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| 258 | mask |= IFF_MULTICAST;
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| 259 | if (strcmp(*argv, "on") == 0) {
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| 260 | flags |= IFF_MULTICAST;
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| 261 | } else if (strcmp(*argv, "off") == 0) {
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| 262 | flags &= ~IFF_MULTICAST;
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| 263 | } else
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| 264 | return on_off("multicast");
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| 265 | } else if (strcmp(*argv, "arp") == 0) {
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| 266 | NEXT_ARG();
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| 267 | mask |= IFF_NOARP;
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| 268 | if (strcmp(*argv, "on") == 0) {
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| 269 | flags &= ~IFF_NOARP;
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| 270 | } else if (strcmp(*argv, "off") == 0) {
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| 271 | flags |= IFF_NOARP;
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| 272 | } else
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| 273 | return on_off("noarp");
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| 274 | } else if (strcmp(*argv, "addr") == 0) {
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| 275 | NEXT_ARG();
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| 276 | newaddr = *argv;
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| 277 | } else {
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| 278 | if (strcmp(*argv, "dev") == 0) {
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| 279 | NEXT_ARG();
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| 280 | }
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| 281 | if (dev)
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| 282 | duparg2("dev", *argv);
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| 283 | dev = *argv;
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| 284 | }
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| 285 | argc--; argv++;
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| 286 | }
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| 287 |
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| 288 | if (!dev) {
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| 289 | bb_error_msg(bb_msg_requires_arg, "\"dev\"");
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| 290 | exit(-1);
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| 291 | }
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| 292 |
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| 293 | if (newaddr || newbrd) {
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| 294 | halen = get_address(dev, &htype);
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| 295 | if (halen < 0)
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| 296 | return -1;
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| 297 | if (newaddr) {
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| 298 | if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
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| 299 | return -1;
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| 300 | }
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| 301 | if (newbrd) {
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| 302 | if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
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| 303 | return -1;
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| 304 | }
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| 305 | }
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| 306 |
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| 307 | if (newname && strcmp(dev, newname)) {
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| 308 | if (do_changename(dev, newname) < 0)
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| 309 | return -1;
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| 310 | dev = newname;
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| 311 | }
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| 312 | if (qlen != -1) {
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| 313 | if (set_qlen(dev, qlen) < 0)
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| 314 | return -1;
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| 315 | }
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| 316 | if (mtu != -1) {
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| 317 | if (set_mtu(dev, mtu) < 0)
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| 318 | return -1;
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| 319 | }
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| 320 | if (newaddr || newbrd) {
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| 321 | if (newbrd) {
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| 322 | if (set_address(&ifr1, 1) < 0)
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| 323 | return -1;
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| 324 | }
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| 325 | if (newaddr) {
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| 326 | if (set_address(&ifr0, 0) < 0)
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| 327 | return -1;
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| 328 | }
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| 329 | }
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| 330 | if (mask)
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| 331 | return do_chflags(dev, flags, mask);
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| 332 | return 0;
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| 333 | }
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| 334 |
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| 335 | static int ipaddr_list_link(int argc, char **argv)
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| 336 | {
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| 337 | preferred_family = AF_PACKET;
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| 338 | do_link = 1;
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| 339 | return ipaddr_list_or_flush(argc, argv, 0);
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| 340 | }
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| 341 |
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| 342 | int do_iplink(int argc, char **argv)
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| 343 | {
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| 344 | if (argc > 0) {
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| 345 | if (matches(*argv, "set") == 0)
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| 346 | return do_set(argc-1, argv+1);
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| 347 | if (matches(*argv, "show") == 0 ||
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| 348 | matches(*argv, "lst") == 0 ||
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| 349 | matches(*argv, "list") == 0)
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| 350 | return ipaddr_list_link(argc-1, argv+1);
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| 351 | } else
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| 352 | return ipaddr_list_link(0, NULL);
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| 353 |
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| 354 | bb_error_msg("Command \"%s\" is unknown.", *argv);
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| 355 | exit(-1);
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| 356 | }
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