1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * This program is free software; you can redistribute it and/or
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4 | * modify it under the terms of the GNU General Public License
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5 | * as published by the Free Software Foundation; either version
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6 | * 2 of the License, or (at your option) any later version.
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7 | *
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8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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9 | *
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10 | * Changes:
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11 | *
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12 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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13 | * initially integrated into busybox by Bernhard Reutner-Fischer
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14 | */
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15 |
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16 | #include <netinet/in.h>
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17 | #include <netinet/ip.h>
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18 | #include <arpa/inet.h>
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19 |
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20 | #include "ip_common.h" /* #include "libbb.h" is inside */
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21 | #include "rt_names.h"
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22 | #include "utils.h"
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23 |
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24 | /*
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25 | static void usage(void) __attribute__((noreturn));
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26 |
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27 | static void usage(void)
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28 | {
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29 | fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n");
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30 | fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
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31 | fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n");
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32 | fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
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33 | fprintf(stderr, " [ prohibit | reject | unreachable ]\n");
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34 | fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
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35 | fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
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36 | exit(-1);
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37 | }
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38 | */
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39 |
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40 | static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
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41 | struct nlmsghdr *n, void *arg UNUSED_PARAM)
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42 | {
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43 | struct rtmsg *r = NLMSG_DATA(n);
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44 | int len = n->nlmsg_len;
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45 | int host_len = -1;
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46 | struct rtattr * tb[RTA_MAX+1];
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47 | char abuf[256];
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48 | SPRINT_BUF(b1);
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49 |
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50 | if (n->nlmsg_type != RTM_NEWRULE)
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51 | return 0;
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52 |
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53 | len -= NLMSG_LENGTH(sizeof(*r));
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54 | if (len < 0)
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55 | return -1;
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56 |
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57 | memset(tb, 0, sizeof(tb));
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58 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
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59 |
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60 | if (r->rtm_family == AF_INET)
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61 | host_len = 32;
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62 | else if (r->rtm_family == AF_INET6)
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63 | host_len = 128;
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64 | /* else if (r->rtm_family == AF_DECnet)
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65 | host_len = 16;
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66 | else if (r->rtm_family == AF_IPX)
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67 | host_len = 80;
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68 | */
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69 | printf("%u:\t", tb[RTA_PRIORITY] ?
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70 | *(unsigned*)RTA_DATA(tb[RTA_PRIORITY])
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71 | : 0);
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72 | printf("from ");
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73 | if (tb[RTA_SRC]) {
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74 | if (r->rtm_src_len != host_len) {
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75 | printf("%s/%u", rt_addr_n2a(r->rtm_family,
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76 | RTA_DATA(tb[RTA_SRC]),
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77 | abuf, sizeof(abuf)),
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78 | r->rtm_src_len
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79 | );
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80 | } else {
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81 | fputs(format_host(r->rtm_family,
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82 | RTA_PAYLOAD(tb[RTA_SRC]),
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83 | RTA_DATA(tb[RTA_SRC]),
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84 | abuf, sizeof(abuf)),
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85 | stdout
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86 | );
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87 | }
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88 | } else if (r->rtm_src_len) {
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89 | printf("0/%d", r->rtm_src_len);
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90 | } else {
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91 | printf("all");
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92 | }
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93 | bb_putchar(' ');
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94 |
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95 | if (tb[RTA_DST]) {
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96 | if (r->rtm_dst_len != host_len) {
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97 | printf("to %s/%u ", rt_addr_n2a(r->rtm_family,
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98 | RTA_DATA(tb[RTA_DST]),
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99 | abuf, sizeof(abuf)),
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100 | r->rtm_dst_len
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101 | );
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102 | } else {
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103 | printf("to %s ", format_host(r->rtm_family,
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104 | RTA_PAYLOAD(tb[RTA_DST]),
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105 | RTA_DATA(tb[RTA_DST]),
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106 | abuf, sizeof(abuf)));
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107 | }
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108 | } else if (r->rtm_dst_len) {
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109 | printf("to 0/%d ", r->rtm_dst_len);
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110 | }
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111 |
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112 | if (r->rtm_tos) {
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113 | printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1));
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114 | }
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115 | if (tb[RTA_PROTOINFO]) {
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116 | printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
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117 | }
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118 |
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119 | if (tb[RTA_IIF]) {
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120 | printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
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121 | }
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122 |
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123 | if (r->rtm_table)
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124 | printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1));
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125 |
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126 | if (tb[RTA_FLOW]) {
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127 | uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
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128 | uint32_t from = to>>16;
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129 | to &= 0xFFFF;
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130 | if (from) {
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131 | printf("realms %s/",
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132 | rtnl_rtrealm_n2a(from, b1));
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133 | }
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134 | printf("%s ",
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135 | rtnl_rtrealm_n2a(to, b1));
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136 | }
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137 |
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138 | if (r->rtm_type == RTN_NAT) {
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139 | if (tb[RTA_GATEWAY]) {
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140 | printf("map-to %s ",
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141 | format_host(r->rtm_family,
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142 | RTA_PAYLOAD(tb[RTA_GATEWAY]),
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143 | RTA_DATA(tb[RTA_GATEWAY]),
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144 | abuf, sizeof(abuf)));
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145 | } else
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146 | printf("masquerade");
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147 | } else if (r->rtm_type != RTN_UNICAST)
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148 | fputs(rtnl_rtntype_n2a(r->rtm_type, b1), stdout);
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149 |
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150 | bb_putchar('\n');
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151 | /*fflush_all();*/
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152 | return 0;
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153 | }
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154 |
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155 | /* Return value becomes exitcode. It's okay to not return at all */
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156 | static int iprule_list(char **argv)
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157 | {
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158 | struct rtnl_handle rth;
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159 | int af = preferred_family;
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160 |
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161 | if (af == AF_UNSPEC)
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162 | af = AF_INET;
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163 |
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164 | if (*argv) {
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165 | //bb_error_msg("\"rule show\" needs no arguments");
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166 | bb_warn_ignoring_args(*argv);
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167 | return -1;
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168 | }
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169 |
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170 | xrtnl_open(&rth);
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171 |
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172 | xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
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173 | xrtnl_dump_filter(&rth, print_rule, NULL);
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174 |
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175 | return 0;
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176 | }
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177 |
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178 | /* Return value becomes exitcode. It's okay to not return at all */
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179 | static int iprule_modify(int cmd, char **argv)
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180 | {
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181 | static const char keywords[] ALIGN1 =
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182 | "from\0""to\0""preference\0""order\0""priority\0"
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183 | "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
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184 | "iif\0""nat\0""map-to\0""type\0""help\0";
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185 | enum {
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186 | ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
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187 | ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
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188 | ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
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189 | };
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190 | bool table_ok = 0;
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191 | struct rtnl_handle rth;
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192 | struct {
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193 | struct nlmsghdr n;
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194 | struct rtmsg r;
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195 | char buf[1024];
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196 | } req;
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197 | smalluint key;
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198 |
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199 | memset(&req, 0, sizeof(req));
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200 |
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201 | req.n.nlmsg_type = cmd;
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202 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
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203 | req.n.nlmsg_flags = NLM_F_REQUEST;
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204 | req.r.rtm_family = preferred_family;
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205 | req.r.rtm_protocol = RTPROT_BOOT;
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206 | req.r.rtm_scope = RT_SCOPE_UNIVERSE;
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207 | req.r.rtm_table = 0;
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208 | req.r.rtm_type = RTN_UNSPEC;
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209 |
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210 | if (cmd == RTM_NEWRULE) {
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211 | req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
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212 | req.r.rtm_type = RTN_UNICAST;
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213 | }
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214 |
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215 | while (*argv) {
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216 | key = index_in_substrings(keywords, *argv) + 1;
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217 | if (key == 0) /* no match found in keywords array, bail out. */
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218 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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219 | if (key == ARG_from) {
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220 | inet_prefix dst;
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221 | NEXT_ARG();
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222 | get_prefix(&dst, *argv, req.r.rtm_family);
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223 | req.r.rtm_src_len = dst.bitlen;
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224 | addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
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225 | } else if (key == ARG_to) {
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226 | inet_prefix dst;
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227 | NEXT_ARG();
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228 | get_prefix(&dst, *argv, req.r.rtm_family);
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229 | req.r.rtm_dst_len = dst.bitlen;
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230 | addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
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231 | } else if (key == ARG_preference ||
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232 | key == ARG_order ||
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233 | key == ARG_priority
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234 | ) {
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235 | uint32_t pref;
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236 | NEXT_ARG();
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237 | pref = get_u32(*argv, "preference");
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238 | addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
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239 | } else if (key == ARG_tos) {
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240 | uint32_t tos;
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241 | NEXT_ARG();
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242 | if (rtnl_dsfield_a2n(&tos, *argv))
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243 | invarg(*argv, "TOS");
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244 | req.r.rtm_tos = tos;
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245 | } else if (key == ARG_fwmark) {
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246 | uint32_t fwmark;
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247 | NEXT_ARG();
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248 | fwmark = get_u32(*argv, "fwmark");
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249 | addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
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250 | } else if (key == ARG_realms) {
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251 | uint32_t realm;
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252 | NEXT_ARG();
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253 | if (get_rt_realms(&realm, *argv))
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254 | invarg(*argv, "realms");
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255 | addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
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256 | } else if (key == ARG_table ||
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257 | key == ARG_lookup
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258 | ) {
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259 | uint32_t tid;
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260 | NEXT_ARG();
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261 | if (rtnl_rttable_a2n(&tid, *argv))
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262 | invarg(*argv, "table ID");
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263 | req.r.rtm_table = tid;
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264 | table_ok = 1;
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265 | } else if (key == ARG_dev ||
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266 | key == ARG_iif
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267 | ) {
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268 | NEXT_ARG();
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269 | addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
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270 | } else if (key == ARG_nat ||
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271 | key == ARG_map_to
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272 | ) {
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273 | NEXT_ARG();
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274 | addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
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275 | req.r.rtm_type = RTN_NAT;
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276 | } else {
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277 | int type;
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278 |
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279 | if (key == ARG_type) {
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280 | NEXT_ARG();
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281 | }
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282 | if (key == ARG_help)
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283 | bb_show_usage();
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284 | if (rtnl_rtntype_a2n(&type, *argv))
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285 | invarg(*argv, "type");
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286 | req.r.rtm_type = type;
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287 | }
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288 | argv++;
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289 | }
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290 |
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291 | if (req.r.rtm_family == AF_UNSPEC)
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292 | req.r.rtm_family = AF_INET;
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293 |
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294 | if (!table_ok && cmd == RTM_NEWRULE)
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295 | req.r.rtm_table = RT_TABLE_MAIN;
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296 |
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297 | xrtnl_open(&rth);
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298 |
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299 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
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300 | return 2;
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301 |
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302 | return 0;
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303 | }
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304 |
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305 | /* Return value becomes exitcode. It's okay to not return at all */
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306 | int FAST_FUNC do_iprule(char **argv)
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307 | {
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308 | static const char ip_rule_commands[] ALIGN1 =
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309 | "add\0""delete\0""list\0""show\0";
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310 | if (*argv) {
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311 | smalluint cmd = index_in_substrings(ip_rule_commands, *argv);
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312 | if (cmd > 3)
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313 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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314 | argv++;
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315 | if (cmd < 2)
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316 | return iprule_modify((cmd == 0) ? RTM_NEWRULE : RTM_DELRULE, argv);
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317 | }
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318 | return iprule_list(argv);
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319 | }
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