1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * iprule.c "ip rule".
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4 | *
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5 | * This program is free software; you can redistribute it and/or
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6 | * modify it under the terms of the GNU General Public License
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7 | * as published by the Free Software Foundation; either version
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8 | * 2 of the License, or (at your option) any later version.
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9 | *
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10 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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11 | *
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12 | *
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13 | * Changes:
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14 | *
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15 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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16 | * initially integrated into busybox by Bernhard Fischer
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17 | */
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18 |
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19 | #include <syslog.h>
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20 | //#include <sys/socket.h>
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21 | #include <netinet/in.h>
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22 | #include <netinet/ip.h>
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23 | #include <arpa/inet.h>
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24 |
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25 | #include "ip_common.h" /* #include "libbb.h" is inside */
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26 | #include "rt_names.h"
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27 | #include "utils.h"
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28 |
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29 | /*
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30 | static void usage(void) __attribute__((noreturn));
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31 |
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32 | static void usage(void)
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33 | {
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34 | fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n");
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35 | fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
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36 | fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n");
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37 | fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
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38 | fprintf(stderr, " [ prohibit | reject | unreachable ]\n");
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39 | fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
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40 | fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
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41 | exit(-1);
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42 | }
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43 | */
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44 |
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45 | static int print_rule(struct sockaddr_nl *who ATTRIBUTE_UNUSED,
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46 | struct nlmsghdr *n, void *arg)
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47 | {
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48 | FILE *fp = (FILE*)arg;
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49 | struct rtmsg *r = NLMSG_DATA(n);
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50 | int len = n->nlmsg_len;
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51 | int host_len = -1;
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52 | struct rtattr * tb[RTA_MAX+1];
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53 | char abuf[256];
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54 | SPRINT_BUF(b1);
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55 |
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56 | if (n->nlmsg_type != RTM_NEWRULE)
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57 | return 0;
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58 |
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59 | len -= NLMSG_LENGTH(sizeof(*r));
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60 | if (len < 0)
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61 | return -1;
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62 |
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63 | memset(tb, 0, sizeof(tb));
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64 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
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65 |
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66 | if (r->rtm_family == AF_INET)
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67 | host_len = 32;
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68 | else if (r->rtm_family == AF_INET6)
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69 | host_len = 128;
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70 | /* else if (r->rtm_family == AF_DECnet)
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71 | host_len = 16;
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72 | else if (r->rtm_family == AF_IPX)
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73 | host_len = 80;
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74 | */
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75 | if (tb[RTA_PRIORITY])
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76 | fprintf(fp, "%u:\t", *(unsigned*)RTA_DATA(tb[RTA_PRIORITY]));
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77 | else
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78 | fprintf(fp, "0:\t");
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79 |
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80 | fprintf(fp, "from ");
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81 | if (tb[RTA_SRC]) {
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82 | if (r->rtm_src_len != host_len) {
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83 | fprintf(fp, "%s/%u", rt_addr_n2a(r->rtm_family,
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84 | RTA_PAYLOAD(tb[RTA_SRC]),
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85 | RTA_DATA(tb[RTA_SRC]),
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86 | abuf, sizeof(abuf)),
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87 | r->rtm_src_len
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88 | );
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89 | } else {
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90 | fprintf(fp, "%s", format_host(r->rtm_family,
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91 | RTA_PAYLOAD(tb[RTA_SRC]),
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92 | RTA_DATA(tb[RTA_SRC]),
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93 | abuf, sizeof(abuf))
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94 | );
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95 | }
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96 | } else if (r->rtm_src_len) {
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97 | fprintf(fp, "0/%d", r->rtm_src_len);
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98 | } else {
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99 | fprintf(fp, "all");
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100 | }
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101 | fprintf(fp, " ");
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102 |
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103 | if (tb[RTA_DST]) {
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104 | if (r->rtm_dst_len != host_len) {
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105 | fprintf(fp, "to %s/%u ", rt_addr_n2a(r->rtm_family,
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106 | RTA_PAYLOAD(tb[RTA_DST]),
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107 | RTA_DATA(tb[RTA_DST]),
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108 | abuf, sizeof(abuf)),
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109 | r->rtm_dst_len
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110 | );
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111 | } else {
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112 | fprintf(fp, "to %s ", format_host(r->rtm_family,
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113 | RTA_PAYLOAD(tb[RTA_DST]),
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114 | RTA_DATA(tb[RTA_DST]),
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115 | abuf, sizeof(abuf)));
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116 | }
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117 | } else if (r->rtm_dst_len) {
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118 | fprintf(fp, "to 0/%d ", r->rtm_dst_len);
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119 | }
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120 |
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121 | if (r->rtm_tos) {
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122 | fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
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123 | }
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124 | if (tb[RTA_PROTOINFO]) {
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125 | fprintf(fp, "fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
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126 | }
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127 |
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128 | if (tb[RTA_IIF]) {
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129 | fprintf(fp, "iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
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130 | }
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131 |
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132 | if (r->rtm_table)
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133 | fprintf(fp, "lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1, sizeof(b1)));
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134 |
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135 | if (tb[RTA_FLOW]) {
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136 | uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
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137 | uint32_t from = to>>16;
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138 | to &= 0xFFFF;
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139 | if (from) {
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140 | fprintf(fp, "realms %s/",
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141 | rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
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142 | }
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143 | fprintf(fp, "%s ",
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144 | rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
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145 | }
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146 |
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147 | if (r->rtm_type == RTN_NAT) {
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148 | if (tb[RTA_GATEWAY]) {
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149 | fprintf(fp, "map-to %s ",
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150 | format_host(r->rtm_family,
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151 | RTA_PAYLOAD(tb[RTA_GATEWAY]),
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152 | RTA_DATA(tb[RTA_GATEWAY]),
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153 | abuf, sizeof(abuf)));
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154 | } else
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155 | fprintf(fp, "masquerade");
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156 | } else if (r->rtm_type != RTN_UNICAST)
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157 | fprintf(fp, "%s", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
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158 |
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159 | fputc('\n', fp);
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160 | fflush(fp);
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161 | return 0;
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162 | }
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163 |
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164 | /* Return value becomes exitcode. It's okay to not return at all */
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165 | static int iprule_list(int argc, char **argv)
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166 | {
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167 | struct rtnl_handle rth;
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168 | int af = preferred_family;
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169 |
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170 | if (af == AF_UNSPEC)
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171 | af = AF_INET;
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172 |
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173 | if (argc > 0) {
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174 | //bb_error_msg("\"rule show\" needs no arguments");
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175 | bb_warn_ignoring_args(argc);
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176 | return -1;
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177 | }
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178 |
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179 | xrtnl_open(&rth);
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180 |
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181 | xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
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182 | xrtnl_dump_filter(&rth, print_rule, stdout);
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183 |
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184 | return 0;
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185 | }
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186 |
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187 | /* Return value becomes exitcode. It's okay to not return at all */
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188 | static int iprule_modify(int cmd, int argc, char **argv)
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189 | {
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190 | static const char keywords[] ALIGN1 =
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191 | "from\0""to\0""preference\0""order\0""priority\0"
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192 | "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
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193 | "iif\0""nat\0""map-to\0""type\0""help\0";
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194 | enum {
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195 | ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
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196 | ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
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197 | ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
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198 | };
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199 | bool table_ok = 0;
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200 | struct rtnl_handle rth;
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201 | struct {
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202 | struct nlmsghdr n;
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203 | struct rtmsg r;
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204 | char buf[1024];
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205 | } req;
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206 | smalluint key;
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207 |
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208 | memset(&req, 0, sizeof(req));
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209 |
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210 | req.n.nlmsg_type = cmd;
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211 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
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212 | req.n.nlmsg_flags = NLM_F_REQUEST;
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213 | req.r.rtm_family = preferred_family;
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214 | req.r.rtm_protocol = RTPROT_BOOT;
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215 | req.r.rtm_scope = RT_SCOPE_UNIVERSE;
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216 | req.r.rtm_table = 0;
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217 | req.r.rtm_type = RTN_UNSPEC;
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218 |
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219 | if (cmd == RTM_NEWRULE) {
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220 | req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
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221 | req.r.rtm_type = RTN_UNICAST;
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222 | }
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223 |
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224 | while (argc > 0) {
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225 | key = index_in_substrings(keywords, *argv) + 1;
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226 | if (key == 0) /* no match found in keywords array, bail out. */
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227 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
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228 | if (key == ARG_from) {
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229 | inet_prefix dst;
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230 | NEXT_ARG();
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231 | get_prefix(&dst, *argv, req.r.rtm_family);
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232 | req.r.rtm_src_len = dst.bitlen;
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233 | addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
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234 | } else if (key == ARG_to) {
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235 | inet_prefix dst;
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236 | NEXT_ARG();
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237 | get_prefix(&dst, *argv, req.r.rtm_family);
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238 | req.r.rtm_dst_len = dst.bitlen;
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239 | addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
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240 | } else if (key == ARG_preference ||
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241 | key == ARG_order ||
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242 | key == ARG_priority) {
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243 | uint32_t pref;
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244 | NEXT_ARG();
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245 | if (get_u32(&pref, *argv, 0))
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246 | invarg(*argv, "preference");
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247 | addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
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248 | } else if (key == ARG_tos) {
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249 | uint32_t tos;
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250 | NEXT_ARG();
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251 | if (rtnl_dsfield_a2n(&tos, *argv))
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252 | invarg(*argv, "TOS");
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253 | req.r.rtm_tos = tos;
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254 | } else if (key == ARG_fwmark) {
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255 | uint32_t fwmark;
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256 | NEXT_ARG();
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257 | if (get_u32(&fwmark, *argv, 0))
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258 | invarg(*argv, "fwmark");
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259 | addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
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260 | } else if (key == ARG_realms) {
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261 | uint32_t realm;
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262 | NEXT_ARG();
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263 | if (get_rt_realms(&realm, *argv))
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264 | invarg(*argv, "realms");
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265 | addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
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266 | } else if (key == ARG_table ||
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267 | key == ARG_lookup) {
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268 | uint32_t tid;
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269 | NEXT_ARG();
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270 | if (rtnl_rttable_a2n(&tid, *argv))
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271 | invarg(*argv, "table ID");
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272 | req.r.rtm_table = tid;
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273 | table_ok = 1;
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274 | } else if (key == ARG_dev ||
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275 | key == ARG_iif) {
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276 | NEXT_ARG();
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277 | addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
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278 | } else if (key == ARG_nat ||
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279 | key == ARG_map_to) {
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280 | NEXT_ARG();
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281 | addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
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282 | req.r.rtm_type = RTN_NAT;
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283 | } else {
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284 | int type;
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285 |
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286 | if (key == ARG_type) {
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287 | NEXT_ARG();
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288 | }
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289 | if (key == ARG_help)
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290 | bb_show_usage();
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291 | if (rtnl_rtntype_a2n(&type, *argv))
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292 | invarg(*argv, "type");
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293 | req.r.rtm_type = type;
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294 | }
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295 | argc--;
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296 | argv++;
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297 | }
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298 |
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299 | if (req.r.rtm_family == AF_UNSPEC)
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300 | req.r.rtm_family = AF_INET;
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301 |
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302 | if (!table_ok && cmd == RTM_NEWRULE)
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303 | req.r.rtm_table = RT_TABLE_MAIN;
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304 |
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305 | xrtnl_open(&rth);
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306 |
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307 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
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308 | return 2;
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309 |
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310 | return 0;
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311 | }
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312 |
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313 | /* Return value becomes exitcode. It's okay to not return at all */
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314 | int do_iprule(int argc, char **argv)
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315 | {
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316 | static const char ip_rule_commands[] ALIGN1 =
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317 | "add\0""delete\0""list\0""show\0";
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318 | int cmd = 2; /* list */
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319 |
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320 | if (argc < 1)
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321 | return iprule_list(0, NULL);
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322 | if (*argv)
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323 | cmd = index_in_substrings(ip_rule_commands, *argv);
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324 |
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325 | switch (cmd) {
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326 | case 0: /* add */
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327 | cmd = RTM_NEWRULE;
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328 | break;
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329 | case 1: /* delete */
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330 | cmd = RTM_DELRULE;
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331 | break;
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332 | case 2: /* list */
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333 | case 3: /* show */
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334 | return iprule_list(argc-1, argv+1);
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335 | break;
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336 | default:
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337 | bb_error_msg_and_die("unknown command %s", *argv);
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338 | }
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339 | return iprule_modify(cmd, argc-1, argv+1);
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340 | }
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