1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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4 | *
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5 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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6 | */
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7 | #include <net/if.h>
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8 | #include <net/if_packet.h>
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9 | #include <netpacket/packet.h>
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10 | #include <net/ethernet.h>
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11 |
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12 | #include "ip_common.h" /* #include "libbb.h" is inside */
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13 | #include "rt_names.h"
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14 | #include "utils.h"
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15 |
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16 | #ifndef IFLA_LINKINFO
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17 | # define IFLA_LINKINFO 18
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18 | # define IFLA_INFO_KIND 1
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19 | #endif
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20 |
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21 | /* taken from linux/sockios.h */
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22 | #define SIOCSIFNAME 0x8923 /* set interface name */
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23 |
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24 | /* Exits on error */
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25 | static int get_ctl_fd(void)
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26 | {
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27 | int fd;
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28 |
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29 | fd = socket(PF_INET, SOCK_DGRAM, 0);
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30 | if (fd >= 0)
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31 | return fd;
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32 | fd = socket(PF_PACKET, SOCK_DGRAM, 0);
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33 | if (fd >= 0)
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34 | return fd;
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35 | return xsocket(PF_INET6, SOCK_DGRAM, 0);
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36 | }
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37 |
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38 | /* Exits on error */
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39 | static void do_chflags(char *dev, uint32_t flags, uint32_t mask)
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40 | {
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41 | struct ifreq ifr;
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42 | int fd;
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43 |
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44 | strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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45 | fd = get_ctl_fd();
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46 | xioctl(fd, SIOCGIFFLAGS, &ifr);
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47 | if ((ifr.ifr_flags ^ flags) & mask) {
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48 | ifr.ifr_flags &= ~mask;
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49 | ifr.ifr_flags |= mask & flags;
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50 | xioctl(fd, SIOCSIFFLAGS, &ifr);
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51 | }
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52 | close(fd);
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53 | }
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54 |
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55 | /* Exits on error */
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56 | static void do_changename(char *dev, char *newdev)
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57 | {
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58 | struct ifreq ifr;
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59 | int fd;
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60 |
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61 | strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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62 | strncpy_IFNAMSIZ(ifr.ifr_newname, newdev);
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63 | fd = get_ctl_fd();
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64 | xioctl(fd, SIOCSIFNAME, &ifr);
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65 | close(fd);
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66 | }
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67 |
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68 | /* Exits on error */
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69 | static void set_qlen(char *dev, int qlen)
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70 | {
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71 | struct ifreq ifr;
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72 | int s;
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73 |
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74 | s = get_ctl_fd();
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75 | memset(&ifr, 0, sizeof(ifr));
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76 | strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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77 | ifr.ifr_qlen = qlen;
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78 | xioctl(s, SIOCSIFTXQLEN, &ifr);
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79 | close(s);
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80 | }
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81 |
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82 | /* Exits on error */
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83 | static void set_mtu(char *dev, int mtu)
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84 | {
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85 | struct ifreq ifr;
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86 | int s;
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87 |
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88 | s = get_ctl_fd();
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89 | memset(&ifr, 0, sizeof(ifr));
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90 | strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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91 | ifr.ifr_mtu = mtu;
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92 | xioctl(s, SIOCSIFMTU, &ifr);
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93 | close(s);
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94 | }
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95 |
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96 | /* Exits on error */
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97 | static int get_address(char *dev, int *htype)
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98 | {
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99 | struct ifreq ifr;
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100 | struct sockaddr_ll me;
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101 | socklen_t alen;
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102 | int s;
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103 |
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104 | s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
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105 |
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106 | memset(&ifr, 0, sizeof(ifr));
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107 | strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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108 | xioctl(s, SIOCGIFINDEX, &ifr);
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109 |
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110 | memset(&me, 0, sizeof(me));
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111 | me.sll_family = AF_PACKET;
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112 | me.sll_ifindex = ifr.ifr_ifindex;
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113 | me.sll_protocol = htons(ETH_P_LOOP);
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114 | xbind(s, (struct sockaddr*)&me, sizeof(me));
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115 | alen = sizeof(me);
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116 | getsockname(s, (struct sockaddr*)&me, &alen);
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117 | //never happens:
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118 | //if (getsockname(s, (struct sockaddr*)&me, &alen) == -1)
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119 | // bb_perror_msg_and_die("getsockname");
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120 | close(s);
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121 | *htype = me.sll_hatype;
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122 | return me.sll_halen;
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123 | }
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124 |
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125 | /* Exits on error */
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126 | static void parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
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127 | {
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128 | int alen;
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129 |
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130 | memset(ifr, 0, sizeof(*ifr));
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131 | strncpy_IFNAMSIZ(ifr->ifr_name, dev);
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132 | ifr->ifr_hwaddr.sa_family = hatype;
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133 |
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134 | alen = hatype == 1/*ARPHRD_ETHER*/ ? 14/*ETH_HLEN*/ : 19/*INFINIBAND_HLEN*/;
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135 | alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), alen, lla);
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136 | if (alen < 0)
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137 | exit(EXIT_FAILURE);
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138 | if (alen != halen) {
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139 | bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen);
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140 | }
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141 | }
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142 |
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143 | /* Exits on error */
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144 | static void set_address(struct ifreq *ifr, int brd)
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145 | {
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146 | int s;
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147 |
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148 | s = get_ctl_fd();
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149 | if (brd)
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150 | xioctl(s, SIOCSIFHWBROADCAST, ifr);
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151 | else
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152 | xioctl(s, SIOCSIFHWADDR, ifr);
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153 | close(s);
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154 | }
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155 |
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156 |
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157 | static void die_must_be_on_off(const char *msg) NORETURN;
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158 | static void die_must_be_on_off(const char *msg)
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159 | {
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160 | bb_error_msg_and_die("argument of \"%s\" must be \"on\" or \"off\"", msg);
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161 | }
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162 |
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163 | /* Return value becomes exitcode. It's okay to not return at all */
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164 | static int do_set(char **argv)
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165 | {
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166 | char *dev = NULL;
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167 | uint32_t mask = 0;
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168 | uint32_t flags = 0;
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169 | int qlen = -1;
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170 | int mtu = -1;
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171 | char *newaddr = NULL;
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172 | char *newbrd = NULL;
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173 | struct ifreq ifr0, ifr1;
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174 | char *newname = NULL;
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175 | int htype, halen;
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176 | static const char keywords[] ALIGN1 =
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177 | "up\0""down\0""name\0""mtu\0""qlen\0""multicast\0"
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178 | "arp\0""address\0""dev\0";
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179 | enum { ARG_up = 0, ARG_down, ARG_name, ARG_mtu, ARG_qlen, ARG_multicast,
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180 | ARG_arp, ARG_addr, ARG_dev };
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181 | static const char str_on_off[] ALIGN1 = "on\0""off\0";
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182 | enum { PARM_on = 0, PARM_off };
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183 | smalluint key;
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184 |
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185 | while (*argv) {
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186 | /* substring search ensures that e.g. "addr" and "address"
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187 | * are both accepted */
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188 | key = index_in_substrings(keywords, *argv);
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189 | if (key == ARG_up) {
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190 | mask |= IFF_UP;
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191 | flags |= IFF_UP;
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192 | } else if (key == ARG_down) {
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193 | mask |= IFF_UP;
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194 | flags &= ~IFF_UP;
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195 | } else if (key == ARG_name) {
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196 | NEXT_ARG();
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197 | newname = *argv;
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198 | } else if (key == ARG_mtu) {
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199 | NEXT_ARG();
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200 | if (mtu != -1)
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201 | duparg("mtu", *argv);
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202 | mtu = get_unsigned(*argv, "mtu");
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203 | } else if (key == ARG_qlen) {
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204 | NEXT_ARG();
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205 | if (qlen != -1)
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206 | duparg("qlen", *argv);
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207 | qlen = get_unsigned(*argv, "qlen");
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208 | } else if (key == ARG_addr) {
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209 | NEXT_ARG();
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210 | newaddr = *argv;
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211 | } else if (key >= ARG_dev) {
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212 | if (key == ARG_dev) {
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213 | NEXT_ARG();
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214 | }
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215 | if (dev)
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216 | duparg2("dev", *argv);
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217 | dev = *argv;
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218 | } else {
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219 | int param;
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220 | NEXT_ARG();
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221 | param = index_in_strings(str_on_off, *argv);
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222 | if (key == ARG_multicast) {
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223 | if (param < 0)
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224 | die_must_be_on_off("multicast");
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225 | mask |= IFF_MULTICAST;
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226 | if (param == PARM_on)
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227 | flags |= IFF_MULTICAST;
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228 | else
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229 | flags &= ~IFF_MULTICAST;
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230 | } else if (key == ARG_arp) {
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231 | if (param < 0)
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232 | die_must_be_on_off("arp");
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233 | mask |= IFF_NOARP;
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234 | if (param == PARM_on)
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235 | flags &= ~IFF_NOARP;
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236 | else
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237 | flags |= IFF_NOARP;
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238 | }
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239 | }
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240 | argv++;
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241 | }
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242 |
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243 | if (!dev) {
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244 | bb_error_msg_and_die(bb_msg_requires_arg, "\"dev\"");
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245 | }
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246 |
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247 | if (newaddr || newbrd) {
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248 | halen = get_address(dev, &htype);
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249 | if (newaddr) {
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250 | parse_address(dev, htype, halen, newaddr, &ifr0);
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251 | set_address(&ifr0, 0);
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252 | }
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253 | if (newbrd) {
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254 | parse_address(dev, htype, halen, newbrd, &ifr1);
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255 | set_address(&ifr1, 1);
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256 | }
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257 | }
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258 |
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259 | if (newname && strcmp(dev, newname)) {
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260 | do_changename(dev, newname);
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261 | dev = newname;
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262 | }
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263 | if (qlen != -1) {
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264 | set_qlen(dev, qlen);
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265 | }
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266 | if (mtu != -1) {
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267 | set_mtu(dev, mtu);
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268 | }
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269 | if (mask)
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270 | do_chflags(dev, flags, mask);
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271 | return 0;
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272 | }
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273 |
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274 | static int ipaddr_list_link(char **argv)
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275 | {
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276 | preferred_family = AF_PACKET;
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277 | return ipaddr_list_or_flush(argv, 0);
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278 | }
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279 |
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280 | #ifndef NLMSG_TAIL
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281 | #define NLMSG_TAIL(nmsg) \
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282 | ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
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283 | #endif
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284 | /* Return value becomes exitcode. It's okay to not return at all */
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285 | static int do_change(char **argv, const unsigned rtm)
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286 | {
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287 | static const char keywords[] ALIGN1 =
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288 | "link\0""name\0""type\0""dev\0";
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289 | enum {
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290 | ARG_link,
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291 | ARG_name,
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292 | ARG_type,
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293 | ARG_dev,
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294 | };
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295 | struct rtnl_handle rth;
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296 | struct {
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297 | struct nlmsghdr n;
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298 | struct ifinfomsg i;
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299 | char buf[1024];
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300 | } req;
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301 | smalluint arg;
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302 | char *name_str = NULL, *link_str = NULL, *type_str = NULL, *dev_str = NULL;
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303 |
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304 | memset(&req, 0, sizeof(req));
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305 |
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306 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
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307 | req.n.nlmsg_flags = NLM_F_REQUEST;
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308 | req.n.nlmsg_type = rtm;
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309 | req.i.ifi_family = preferred_family;
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310 | if (rtm == RTM_NEWLINK)
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311 | req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
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312 |
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313 | while (*argv) {
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314 | arg = index_in_substrings(keywords, *argv);
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315 | if (arg == ARG_link) {
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316 | NEXT_ARG();
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317 | link_str = *argv;
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318 | } else if (arg == ARG_name) {
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319 | NEXT_ARG();
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320 | name_str = *argv;
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321 | } else if (arg == ARG_type) {
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322 | NEXT_ARG();
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323 | type_str = *argv;
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324 | } else {
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325 | if (arg == ARG_dev) {
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326 | if (dev_str)
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327 | duparg(*argv, "dev");
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328 | NEXT_ARG();
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329 | }
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330 | dev_str = *argv;
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331 | }
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332 | argv++;
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333 | }
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334 | xrtnl_open(&rth);
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335 | ll_init_map(&rth);
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336 | if (type_str) {
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337 | struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
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338 |
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339 | addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
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340 | addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type_str,
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341 | strlen(type_str));
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342 | linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
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343 | }
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344 | if (rtm != RTM_NEWLINK) {
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345 | if (!dev_str)
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346 | return 1; /* Need a device to delete */
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347 | req.i.ifi_index = xll_name_to_index(dev_str);
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348 | } else {
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349 | if (!name_str)
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350 | name_str = dev_str;
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351 | if (link_str) {
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352 | int idx = xll_name_to_index(link_str);
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353 | addattr_l(&req.n, sizeof(req), IFLA_LINK, &idx, 4);
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354 | }
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355 | }
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356 | if (name_str) {
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357 | const size_t name_len = strlen(name_str) + 1;
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358 | if (name_len < 2 || name_len > IFNAMSIZ)
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359 | invarg(name_str, "name");
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360 | addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name_str, name_len);
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361 | }
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362 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
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363 | return 2;
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364 | return 0;
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365 | }
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366 |
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367 | /* Return value becomes exitcode. It's okay to not return at all */
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368 | int FAST_FUNC do_iplink(char **argv)
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369 | {
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370 | static const char keywords[] ALIGN1 =
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371 | "add\0""delete\0""set\0""show\0""lst\0""list\0";
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372 | if (*argv) {
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373 | smalluint key = index_in_substrings(keywords, *argv);
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374 | if (key > 5) /* invalid argument */
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375 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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376 | argv++;
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377 | if (key <= 1) /* add/delete */
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378 | return do_change(argv, key ? RTM_DELLINK : RTM_NEWLINK);
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379 | else if (key == 2) /* set */
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380 | return do_set(argv);
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381 | }
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382 | /* show, lst, list */
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383 | return ipaddr_list_link(argv);
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384 | }
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