1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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4 | *
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5 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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6 | *
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7 | * Changes:
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8 | *
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9 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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10 | * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
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11 | */
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12 |
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13 | #include "ip_common.h" /* #include "libbb.h" is inside */
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14 | #include "rt_names.h"
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15 | #include "utils.h"
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16 |
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17 | #ifndef RTAX_RTTVAR
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18 | #define RTAX_RTTVAR RTAX_HOPS
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19 | #endif
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20 |
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21 |
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22 | struct filter_t {
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23 | int tb;
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24 | smallint flushed;
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25 | char *flushb;
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26 | int flushp;
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27 | int flushe;
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28 | struct rtnl_handle *rth;
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29 | //int protocol, protocolmask; - write-only fields?!
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30 | //int scope, scopemask; - unused
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31 | //int type; - read-only
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32 | //int typemask; - unused
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33 | //int tos, tosmask; - unused
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34 | int iif;
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35 | int oif;
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36 | //int realm, realmmask; - unused
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37 | //inet_prefix rprefsrc; - read-only
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38 | inet_prefix rvia;
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39 | inet_prefix rdst;
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40 | inet_prefix mdst;
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41 | inet_prefix rsrc;
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42 | inet_prefix msrc;
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43 | } FIX_ALIASING;
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44 | typedef struct filter_t filter_t;
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45 |
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46 | #define G_filter (*(filter_t*)&bb_common_bufsiz1)
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47 |
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48 | static int flush_update(void)
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49 | {
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50 | if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
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51 | bb_perror_msg("can't send flush request");
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52 | return -1;
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53 | }
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54 | G_filter.flushp = 0;
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55 | return 0;
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56 | }
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57 |
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58 | static unsigned get_hz(void)
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59 | {
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60 | static unsigned hz_internal;
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61 | FILE *fp;
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62 |
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63 | if (hz_internal)
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64 | return hz_internal;
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65 |
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66 | fp = fopen_for_read("/proc/net/psched");
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67 | if (fp) {
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68 | unsigned nom, denom;
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69 |
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70 | if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
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71 | if (nom == 1000000)
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72 | hz_internal = denom;
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73 | fclose(fp);
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74 | }
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75 | if (!hz_internal)
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76 | hz_internal = sysconf(_SC_CLK_TCK);
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77 | return hz_internal;
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78 | }
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79 |
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80 | static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM,
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81 | struct nlmsghdr *n, void *arg UNUSED_PARAM)
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82 | {
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83 | struct rtmsg *r = NLMSG_DATA(n);
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84 | int len = n->nlmsg_len;
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85 | struct rtattr *tb[RTA_MAX+1];
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86 | char abuf[256];
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87 | inet_prefix dst;
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88 | inet_prefix src;
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89 | int host_len = -1;
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90 | SPRINT_BUF(b1);
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91 |
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92 | if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
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93 | fprintf(stderr, "Not a route: %08x %08x %08x\n",
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94 | n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
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95 | return 0;
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96 | }
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97 | if (G_filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
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98 | return 0;
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99 | len -= NLMSG_LENGTH(sizeof(*r));
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100 | if (len < 0)
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101 | bb_error_msg_and_die("wrong nlmsg len %d", len);
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102 |
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103 | if (r->rtm_family == AF_INET6)
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104 | host_len = 128;
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105 | else if (r->rtm_family == AF_INET)
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106 | host_len = 32;
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107 |
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108 | if (r->rtm_family == AF_INET6) {
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109 | if (G_filter.tb) {
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110 | if (G_filter.tb < 0) {
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111 | if (!(r->rtm_flags & RTM_F_CLONED)) {
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112 | return 0;
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113 | }
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114 | } else {
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115 | if (r->rtm_flags & RTM_F_CLONED) {
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116 | return 0;
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117 | }
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118 | if (G_filter.tb == RT_TABLE_LOCAL) {
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119 | if (r->rtm_type != RTN_LOCAL) {
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120 | return 0;
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121 | }
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122 | } else if (G_filter.tb == RT_TABLE_MAIN) {
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123 | if (r->rtm_type == RTN_LOCAL) {
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124 | return 0;
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125 | }
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126 | } else {
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127 | return 0;
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128 | }
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129 | }
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130 | }
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131 | } else {
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132 | if (G_filter.tb > 0 && G_filter.tb != r->rtm_table) {
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133 | return 0;
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134 | }
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135 | }
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136 | if (G_filter.rdst.family
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137 | && (r->rtm_family != G_filter.rdst.family || G_filter.rdst.bitlen > r->rtm_dst_len)
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138 | ) {
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139 | return 0;
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140 | }
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141 | if (G_filter.mdst.family
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142 | && (r->rtm_family != G_filter.mdst.family
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143 | || (G_filter.mdst.bitlen >= 0 && G_filter.mdst.bitlen < r->rtm_dst_len)
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144 | )
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145 | ) {
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146 | return 0;
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147 | }
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148 | if (G_filter.rsrc.family
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149 | && (r->rtm_family != G_filter.rsrc.family || G_filter.rsrc.bitlen > r->rtm_src_len)
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150 | ) {
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151 | return 0;
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152 | }
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153 | if (G_filter.msrc.family
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154 | && (r->rtm_family != G_filter.msrc.family
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155 | || (G_filter.msrc.bitlen >= 0 && G_filter.msrc.bitlen < r->rtm_src_len)
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156 | )
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157 | ) {
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158 | return 0;
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159 | }
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160 |
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161 | memset(tb, 0, sizeof(tb));
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162 | memset(&src, 0, sizeof(src));
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163 | memset(&dst, 0, sizeof(dst));
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164 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
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165 |
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166 | if (tb[RTA_SRC]) {
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167 | src.bitlen = r->rtm_src_len;
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168 | src.bytelen = (r->rtm_family == AF_INET6 ? 16 : 4);
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169 | memcpy(src.data, RTA_DATA(tb[RTA_SRC]), src.bytelen);
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170 | }
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171 | if (tb[RTA_DST]) {
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172 | dst.bitlen = r->rtm_dst_len;
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173 | dst.bytelen = (r->rtm_family == AF_INET6 ? 16 : 4);
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174 | memcpy(dst.data, RTA_DATA(tb[RTA_DST]), dst.bytelen);
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175 | }
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176 |
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177 | if (G_filter.rdst.family
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178 | && inet_addr_match(&dst, &G_filter.rdst, G_filter.rdst.bitlen)
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179 | ) {
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180 | return 0;
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181 | }
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182 | if (G_filter.mdst.family
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183 | && G_filter.mdst.bitlen >= 0
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184 | && inet_addr_match(&dst, &G_filter.mdst, r->rtm_dst_len)
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185 | ) {
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186 | return 0;
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187 | }
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188 | if (G_filter.rsrc.family
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189 | && inet_addr_match(&src, &G_filter.rsrc, G_filter.rsrc.bitlen)
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190 | ) {
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191 | return 0;
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192 | }
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193 | if (G_filter.msrc.family && G_filter.msrc.bitlen >= 0
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194 | && inet_addr_match(&src, &G_filter.msrc, r->rtm_src_len)
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195 | ) {
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196 | return 0;
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197 | }
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198 | if (G_filter.oif != 0) {
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199 | if (!tb[RTA_OIF])
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200 | return 0;
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201 | if (G_filter.oif != *(int*)RTA_DATA(tb[RTA_OIF]))
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202 | return 0;
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203 | }
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204 |
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205 | if (G_filter.flushb) {
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206 | struct nlmsghdr *fn;
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207 |
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208 | /* We are creating route flush commands */
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209 |
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210 | if (r->rtm_family == AF_INET6
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211 | && r->rtm_dst_len == 0
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212 | && r->rtm_type == RTN_UNREACHABLE
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213 | && tb[RTA_PRIORITY]
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214 | && *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1
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215 | ) {
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216 | return 0;
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217 | }
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218 |
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219 | if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
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220 | if (flush_update())
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221 | bb_error_msg_and_die("flush");
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222 | }
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223 | fn = (void*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
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224 | memcpy(fn, n, n->nlmsg_len);
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225 | fn->nlmsg_type = RTM_DELROUTE;
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226 | fn->nlmsg_flags = NLM_F_REQUEST;
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227 | fn->nlmsg_seq = ++G_filter.rth->seq;
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228 | G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
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229 | G_filter.flushed = 1;
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230 | return 0;
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231 | }
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232 |
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233 | /* We are printing routes */
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234 |
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235 | if (n->nlmsg_type == RTM_DELROUTE) {
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236 | printf("Deleted ");
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237 | }
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238 | if (r->rtm_type != RTN_UNICAST /* && !G_filter.type - always 0 */) {
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239 | printf("%s ", rtnl_rtntype_n2a(r->rtm_type, b1));
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240 | }
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241 |
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242 | if (tb[RTA_DST]) {
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243 | if (r->rtm_dst_len != host_len) {
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244 | printf("%s/%u ", rt_addr_n2a(r->rtm_family,
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245 | RTA_DATA(tb[RTA_DST]),
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246 | abuf, sizeof(abuf)),
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247 | r->rtm_dst_len
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248 | );
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249 | } else {
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250 | printf("%s ", format_host(r->rtm_family,
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251 | RTA_PAYLOAD(tb[RTA_DST]),
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252 | RTA_DATA(tb[RTA_DST]),
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253 | abuf, sizeof(abuf))
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254 | );
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255 | }
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256 | } else if (r->rtm_dst_len) {
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257 | printf("0/%d ", r->rtm_dst_len);
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258 | } else {
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259 | printf("default ");
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260 | }
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261 | if (tb[RTA_SRC]) {
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262 | if (r->rtm_src_len != host_len) {
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263 | printf("from %s/%u ", rt_addr_n2a(r->rtm_family,
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264 | RTA_DATA(tb[RTA_SRC]),
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265 | abuf, sizeof(abuf)),
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266 | r->rtm_src_len
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267 | );
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268 | } else {
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269 | printf("from %s ", format_host(r->rtm_family,
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270 | RTA_PAYLOAD(tb[RTA_SRC]),
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271 | RTA_DATA(tb[RTA_SRC]),
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272 | abuf, sizeof(abuf))
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273 | );
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274 | }
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275 | } else if (r->rtm_src_len) {
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276 | printf("from 0/%u ", r->rtm_src_len);
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277 | }
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278 | if (tb[RTA_GATEWAY] && G_filter.rvia.bitlen != host_len) {
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279 | printf("via %s ", format_host(r->rtm_family,
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280 | RTA_PAYLOAD(tb[RTA_GATEWAY]),
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281 | RTA_DATA(tb[RTA_GATEWAY]),
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282 | abuf, sizeof(abuf)));
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283 | }
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284 | if (tb[RTA_OIF]) {
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285 | printf("dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
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286 | }
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287 |
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288 | /* Todo: parse & show "proto kernel", "scope link" here */
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289 |
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290 | if (tb[RTA_PREFSRC] && /*G_filter.rprefsrc.bitlen - always 0*/ 0 != host_len) {
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291 | /* Do not use format_host(). It is our local addr
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292 | and symbolic name will not be useful.
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293 | */
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294 | printf(" src %s ", rt_addr_n2a(r->rtm_family,
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295 | RTA_DATA(tb[RTA_PREFSRC]),
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296 | abuf, sizeof(abuf)));
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297 | }
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298 | if (tb[RTA_PRIORITY]) {
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299 | printf(" metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY]));
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300 | }
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301 | if (r->rtm_family == AF_INET6) {
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302 | struct rta_cacheinfo *ci = NULL;
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303 | if (tb[RTA_CACHEINFO]) {
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304 | ci = RTA_DATA(tb[RTA_CACHEINFO]);
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305 | }
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306 | if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
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307 | if (r->rtm_flags & RTM_F_CLONED) {
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308 | printf("%c cache ", _SL_);
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309 | }
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310 | if (ci->rta_expires) {
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311 | printf(" expires %dsec", ci->rta_expires / get_hz());
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312 | }
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313 | if (ci->rta_error != 0) {
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314 | printf(" error %d", ci->rta_error);
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315 | }
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316 | } else if (ci) {
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317 | if (ci->rta_error != 0)
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318 | printf(" error %d", ci->rta_error);
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319 | }
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320 | }
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321 | if (tb[RTA_IIF] && G_filter.iif == 0) {
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322 | printf(" iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
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323 | }
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324 | bb_putchar('\n');
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325 | return 0;
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326 | }
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327 |
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328 | /* Return value becomes exitcode. It's okay to not return at all */
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329 | static int iproute_modify(int cmd, unsigned flags, char **argv)
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330 | {
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331 | static const char keywords[] ALIGN1 =
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332 | "src\0""via\0""mtu\0""lock\0""protocol\0"IF_FEATURE_IP_RULE("table\0")
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333 | "dev\0""oif\0""to\0""metric\0";
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334 | enum {
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335 | ARG_src,
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336 | ARG_via,
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337 | ARG_mtu, PARM_lock,
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338 | ARG_protocol,
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339 | IF_FEATURE_IP_RULE(ARG_table,)
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340 | ARG_dev,
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341 | ARG_oif,
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342 | ARG_to,
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343 | ARG_metric,
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344 | };
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345 | enum {
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346 | gw_ok = 1 << 0,
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347 | dst_ok = 1 << 1,
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348 | proto_ok = 1 << 2,
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349 | type_ok = 1 << 3
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350 | };
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351 | struct rtnl_handle rth;
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352 | struct {
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353 | struct nlmsghdr n;
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354 | struct rtmsg r;
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355 | char buf[1024];
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356 | } req;
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357 | char mxbuf[256];
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358 | struct rtattr * mxrta = (void*)mxbuf;
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359 | unsigned mxlock = 0;
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360 | char *d = NULL;
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361 | smalluint ok = 0;
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362 | int arg;
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363 |
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364 | memset(&req, 0, sizeof(req));
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365 |
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366 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
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367 | req.n.nlmsg_flags = NLM_F_REQUEST | flags;
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368 | req.n.nlmsg_type = cmd;
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369 | req.r.rtm_family = preferred_family;
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370 | if (RT_TABLE_MAIN) /* if it is zero, memset already did it */
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371 | req.r.rtm_table = RT_TABLE_MAIN;
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372 | if (RT_SCOPE_NOWHERE)
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373 | req.r.rtm_scope = RT_SCOPE_NOWHERE;
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374 |
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375 | if (cmd != RTM_DELROUTE) {
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376 | req.r.rtm_protocol = RTPROT_BOOT;
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377 | req.r.rtm_scope = RT_SCOPE_UNIVERSE;
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378 | req.r.rtm_type = RTN_UNICAST;
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379 | }
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380 |
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381 | mxrta->rta_type = RTA_METRICS;
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382 | mxrta->rta_len = RTA_LENGTH(0);
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383 |
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384 | while (*argv) {
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385 | arg = index_in_substrings(keywords, *argv);
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386 | if (arg == ARG_src) {
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387 | inet_prefix addr;
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388 | NEXT_ARG();
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389 | get_addr(&addr, *argv, req.r.rtm_family);
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390 | if (req.r.rtm_family == AF_UNSPEC)
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391 | req.r.rtm_family = addr.family;
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392 | addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
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393 | } else if (arg == ARG_via) {
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394 | inet_prefix addr;
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395 | ok |= gw_ok;
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396 | NEXT_ARG();
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397 | get_addr(&addr, *argv, req.r.rtm_family);
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398 | if (req.r.rtm_family == AF_UNSPEC) {
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399 | req.r.rtm_family = addr.family;
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400 | }
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401 | addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
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402 | } else if (arg == ARG_mtu) {
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403 | unsigned mtu;
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404 | NEXT_ARG();
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405 | if (index_in_strings(keywords, *argv) == PARM_lock) {
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406 | mxlock |= (1 << RTAX_MTU);
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407 | NEXT_ARG();
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408 | }
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409 | mtu = get_unsigned(*argv, "mtu");
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410 | rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
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411 | } else if (arg == ARG_protocol) {
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412 | uint32_t prot;
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413 | NEXT_ARG();
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414 | if (rtnl_rtprot_a2n(&prot, *argv))
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415 | invarg(*argv, "protocol");
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416 | req.r.rtm_protocol = prot;
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417 | ok |= proto_ok;
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418 | #if ENABLE_FEATURE_IP_RULE
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419 | } else if (arg == ARG_table) {
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420 | uint32_t tid;
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421 | NEXT_ARG();
|
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422 | if (rtnl_rttable_a2n(&tid, *argv))
|
---|
423 | invarg(*argv, "table");
|
---|
424 | req.r.rtm_table = tid;
|
---|
425 | #endif
|
---|
426 | } else if (arg == ARG_dev || arg == ARG_oif) {
|
---|
427 | NEXT_ARG();
|
---|
428 | d = *argv;
|
---|
429 | } else if (arg == ARG_metric) {
|
---|
430 | uint32_t metric;
|
---|
431 | NEXT_ARG();
|
---|
432 | metric = get_u32(*argv, "metric");
|
---|
433 | addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
|
---|
434 | } else {
|
---|
435 | int type;
|
---|
436 | inet_prefix dst;
|
---|
437 |
|
---|
438 | if (arg == ARG_to) {
|
---|
439 | NEXT_ARG();
|
---|
440 | }
|
---|
441 | if ((**argv < '0' || **argv > '9')
|
---|
442 | && rtnl_rtntype_a2n(&type, *argv) == 0
|
---|
443 | ) {
|
---|
444 | NEXT_ARG();
|
---|
445 | req.r.rtm_type = type;
|
---|
446 | ok |= type_ok;
|
---|
447 | }
|
---|
448 |
|
---|
449 | if (ok & dst_ok) {
|
---|
450 | duparg2("to", *argv);
|
---|
451 | }
|
---|
452 | get_prefix(&dst, *argv, req.r.rtm_family);
|
---|
453 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
454 | req.r.rtm_family = dst.family;
|
---|
455 | }
|
---|
456 | req.r.rtm_dst_len = dst.bitlen;
|
---|
457 | ok |= dst_ok;
|
---|
458 | if (dst.bytelen) {
|
---|
459 | addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
|
---|
460 | }
|
---|
461 | }
|
---|
462 | argv++;
|
---|
463 | }
|
---|
464 |
|
---|
465 | xrtnl_open(&rth);
|
---|
466 |
|
---|
467 | if (d) {
|
---|
468 | int idx;
|
---|
469 |
|
---|
470 | ll_init_map(&rth);
|
---|
471 |
|
---|
472 | if (d) {
|
---|
473 | idx = xll_name_to_index(d);
|
---|
474 | addattr32(&req.n, sizeof(req), RTA_OIF, idx);
|
---|
475 | }
|
---|
476 | }
|
---|
477 |
|
---|
478 | if (mxrta->rta_len > RTA_LENGTH(0)) {
|
---|
479 | if (mxlock) {
|
---|
480 | rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
|
---|
481 | }
|
---|
482 | addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
|
---|
483 | }
|
---|
484 |
|
---|
485 | if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT)
|
---|
486 | req.r.rtm_scope = RT_SCOPE_HOST;
|
---|
487 | else
|
---|
488 | if (req.r.rtm_type == RTN_BROADCAST
|
---|
489 | || req.r.rtm_type == RTN_MULTICAST
|
---|
490 | || req.r.rtm_type == RTN_ANYCAST
|
---|
491 | ) {
|
---|
492 | req.r.rtm_scope = RT_SCOPE_LINK;
|
---|
493 | }
|
---|
494 | else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) {
|
---|
495 | if (cmd == RTM_DELROUTE)
|
---|
496 | req.r.rtm_scope = RT_SCOPE_NOWHERE;
|
---|
497 | else if (!(ok & gw_ok))
|
---|
498 | req.r.rtm_scope = RT_SCOPE_LINK;
|
---|
499 | }
|
---|
500 |
|
---|
501 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
502 | req.r.rtm_family = AF_INET;
|
---|
503 | }
|
---|
504 |
|
---|
505 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
|
---|
506 | return 2;
|
---|
507 | }
|
---|
508 |
|
---|
509 | return 0;
|
---|
510 | }
|
---|
511 |
|
---|
512 | static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
|
---|
513 | {
|
---|
514 | struct {
|
---|
515 | struct nlmsghdr nlh;
|
---|
516 | struct rtmsg rtm;
|
---|
517 | } req;
|
---|
518 | struct sockaddr_nl nladdr;
|
---|
519 |
|
---|
520 | memset(&nladdr, 0, sizeof(nladdr));
|
---|
521 | memset(&req, 0, sizeof(req));
|
---|
522 | nladdr.nl_family = AF_NETLINK;
|
---|
523 |
|
---|
524 | req.nlh.nlmsg_len = sizeof(req);
|
---|
525 | if (RTM_GETROUTE)
|
---|
526 | req.nlh.nlmsg_type = RTM_GETROUTE;
|
---|
527 | if (NLM_F_ROOT | NLM_F_REQUEST)
|
---|
528 | req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST;
|
---|
529 | /*req.nlh.nlmsg_pid = 0; - memset did it already */
|
---|
530 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
|
---|
531 | req.rtm.rtm_family = family;
|
---|
532 | if (RTM_F_CLONED)
|
---|
533 | req.rtm.rtm_flags = RTM_F_CLONED;
|
---|
534 |
|
---|
535 | return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr));
|
---|
536 | }
|
---|
537 |
|
---|
538 | static void iproute_flush_cache(void)
|
---|
539 | {
|
---|
540 | static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush";
|
---|
541 | int flush_fd = open_or_warn(fn, O_WRONLY);
|
---|
542 |
|
---|
543 | if (flush_fd < 0) {
|
---|
544 | return;
|
---|
545 | }
|
---|
546 |
|
---|
547 | if (write(flush_fd, "-1", 2) < 2) {
|
---|
548 | bb_perror_msg("can't flush routing cache");
|
---|
549 | return;
|
---|
550 | }
|
---|
551 | close(flush_fd);
|
---|
552 | }
|
---|
553 |
|
---|
554 | static void iproute_reset_filter(void)
|
---|
555 | {
|
---|
556 | memset(&G_filter, 0, sizeof(G_filter));
|
---|
557 | G_filter.mdst.bitlen = -1;
|
---|
558 | G_filter.msrc.bitlen = -1;
|
---|
559 | }
|
---|
560 |
|
---|
561 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
562 | static int iproute_list_or_flush(char **argv, int flush)
|
---|
563 | {
|
---|
564 | int do_ipv6 = preferred_family;
|
---|
565 | struct rtnl_handle rth;
|
---|
566 | char *id = NULL;
|
---|
567 | char *od = NULL;
|
---|
568 | static const char keywords[] ALIGN1 =
|
---|
569 | /* "ip route list/flush" parameters: */
|
---|
570 | "protocol\0" "dev\0" "oif\0" "iif\0"
|
---|
571 | "via\0" "table\0" "cache\0"
|
---|
572 | "from\0" "to\0"
|
---|
573 | /* and possible further keywords */
|
---|
574 | "all\0"
|
---|
575 | "root\0"
|
---|
576 | "match\0"
|
---|
577 | "exact\0"
|
---|
578 | "main\0"
|
---|
579 | ;
|
---|
580 | enum {
|
---|
581 | KW_proto, KW_dev, KW_oif, KW_iif,
|
---|
582 | KW_via, KW_table, KW_cache,
|
---|
583 | KW_from, KW_to,
|
---|
584 | /* */
|
---|
585 | KW_all,
|
---|
586 | KW_root,
|
---|
587 | KW_match,
|
---|
588 | KW_exact,
|
---|
589 | KW_main,
|
---|
590 | };
|
---|
591 | int arg, parm;
|
---|
592 |
|
---|
593 | iproute_reset_filter();
|
---|
594 | G_filter.tb = RT_TABLE_MAIN;
|
---|
595 |
|
---|
596 | if (flush && !*argv)
|
---|
597 | bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\"");
|
---|
598 |
|
---|
599 | while (*argv) {
|
---|
600 | arg = index_in_substrings(keywords, *argv);
|
---|
601 | if (arg == KW_proto) {
|
---|
602 | uint32_t prot = 0;
|
---|
603 | NEXT_ARG();
|
---|
604 | //G_filter.protocolmask = -1;
|
---|
605 | if (rtnl_rtprot_a2n(&prot, *argv)) {
|
---|
606 | if (index_in_strings(keywords, *argv) != KW_all)
|
---|
607 | invarg(*argv, "protocol");
|
---|
608 | prot = 0;
|
---|
609 | //G_filter.protocolmask = 0;
|
---|
610 | }
|
---|
611 | //G_filter.protocol = prot;
|
---|
612 | } else if (arg == KW_dev || arg == KW_oif) {
|
---|
613 | NEXT_ARG();
|
---|
614 | od = *argv;
|
---|
615 | } else if (arg == KW_iif) {
|
---|
616 | NEXT_ARG();
|
---|
617 | id = *argv;
|
---|
618 | } else if (arg == KW_via) {
|
---|
619 | NEXT_ARG();
|
---|
620 | get_prefix(&G_filter.rvia, *argv, do_ipv6);
|
---|
621 | } else if (arg == KW_table) { /* table all/cache/main */
|
---|
622 | NEXT_ARG();
|
---|
623 | parm = index_in_substrings(keywords, *argv);
|
---|
624 | if (parm == KW_cache)
|
---|
625 | G_filter.tb = -1;
|
---|
626 | else if (parm == KW_all)
|
---|
627 | G_filter.tb = 0;
|
---|
628 | else if (parm != KW_main) {
|
---|
629 | #if ENABLE_FEATURE_IP_RULE
|
---|
630 | uint32_t tid;
|
---|
631 | if (rtnl_rttable_a2n(&tid, *argv))
|
---|
632 | invarg(*argv, "table");
|
---|
633 | G_filter.tb = tid;
|
---|
634 | #else
|
---|
635 | invarg(*argv, "table");
|
---|
636 | #endif
|
---|
637 | }
|
---|
638 | } else if (arg == KW_cache) {
|
---|
639 | /* The command 'ip route flush cache' is used by OpenSWAN.
|
---|
640 | * Assuming it's a synonym for 'ip route flush table cache' */
|
---|
641 | G_filter.tb = -1;
|
---|
642 | } else if (arg == KW_from) {
|
---|
643 | NEXT_ARG();
|
---|
644 | parm = index_in_substrings(keywords, *argv);
|
---|
645 | if (parm == KW_root) {
|
---|
646 | NEXT_ARG();
|
---|
647 | get_prefix(&G_filter.rsrc, *argv, do_ipv6);
|
---|
648 | } else if (parm == KW_match) {
|
---|
649 | NEXT_ARG();
|
---|
650 | get_prefix(&G_filter.msrc, *argv, do_ipv6);
|
---|
651 | } else {
|
---|
652 | if (parm == KW_exact)
|
---|
653 | NEXT_ARG();
|
---|
654 | get_prefix(&G_filter.msrc, *argv, do_ipv6);
|
---|
655 | G_filter.rsrc = G_filter.msrc;
|
---|
656 | }
|
---|
657 | } else { /* "to" is the default parameter */
|
---|
658 | if (arg == KW_to) {
|
---|
659 | NEXT_ARG();
|
---|
660 | arg = index_in_substrings(keywords, *argv);
|
---|
661 | }
|
---|
662 | /* parm = arg; - would be more plausible, but we reuse 'arg' here */
|
---|
663 | if (arg == KW_root) {
|
---|
664 | NEXT_ARG();
|
---|
665 | get_prefix(&G_filter.rdst, *argv, do_ipv6);
|
---|
666 | } else if (arg == KW_match) {
|
---|
667 | NEXT_ARG();
|
---|
668 | get_prefix(&G_filter.mdst, *argv, do_ipv6);
|
---|
669 | } else { /* "to exact" is the default */
|
---|
670 | if (arg == KW_exact)
|
---|
671 | NEXT_ARG();
|
---|
672 | get_prefix(&G_filter.mdst, *argv, do_ipv6);
|
---|
673 | G_filter.rdst = G_filter.mdst;
|
---|
674 | }
|
---|
675 | }
|
---|
676 | argv++;
|
---|
677 | }
|
---|
678 |
|
---|
679 | if (do_ipv6 == AF_UNSPEC && G_filter.tb) {
|
---|
680 | do_ipv6 = AF_INET;
|
---|
681 | }
|
---|
682 |
|
---|
683 | xrtnl_open(&rth);
|
---|
684 | ll_init_map(&rth);
|
---|
685 |
|
---|
686 | if (id || od) {
|
---|
687 | int idx;
|
---|
688 |
|
---|
689 | if (id) {
|
---|
690 | idx = xll_name_to_index(id);
|
---|
691 | G_filter.iif = idx;
|
---|
692 | }
|
---|
693 | if (od) {
|
---|
694 | idx = xll_name_to_index(od);
|
---|
695 | G_filter.oif = idx;
|
---|
696 | }
|
---|
697 | }
|
---|
698 |
|
---|
699 | if (flush) {
|
---|
700 | char flushb[4096-512];
|
---|
701 |
|
---|
702 | if (G_filter.tb == -1) { /* "flush table cache" */
|
---|
703 | if (do_ipv6 != AF_INET6)
|
---|
704 | iproute_flush_cache();
|
---|
705 | if (do_ipv6 == AF_INET)
|
---|
706 | return 0;
|
---|
707 | }
|
---|
708 |
|
---|
709 | G_filter.flushb = flushb;
|
---|
710 | G_filter.flushp = 0;
|
---|
711 | G_filter.flushe = sizeof(flushb);
|
---|
712 | G_filter.rth = &rth;
|
---|
713 |
|
---|
714 | for (;;) {
|
---|
715 | xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
|
---|
716 | G_filter.flushed = 0;
|
---|
717 | xrtnl_dump_filter(&rth, print_route, NULL);
|
---|
718 | if (G_filter.flushed == 0)
|
---|
719 | return 0;
|
---|
720 | if (flush_update())
|
---|
721 | return 1;
|
---|
722 | }
|
---|
723 | }
|
---|
724 |
|
---|
725 | if (G_filter.tb != -1) {
|
---|
726 | xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
|
---|
727 | } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
|
---|
728 | bb_perror_msg_and_die("can't send dump request");
|
---|
729 | }
|
---|
730 | xrtnl_dump_filter(&rth, print_route, NULL);
|
---|
731 |
|
---|
732 | return 0;
|
---|
733 | }
|
---|
734 |
|
---|
735 |
|
---|
736 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
737 | static int iproute_get(char **argv)
|
---|
738 | {
|
---|
739 | struct rtnl_handle rth;
|
---|
740 | struct {
|
---|
741 | struct nlmsghdr n;
|
---|
742 | struct rtmsg r;
|
---|
743 | char buf[1024];
|
---|
744 | } req;
|
---|
745 | char *idev = NULL;
|
---|
746 | char *odev = NULL;
|
---|
747 | bool connected = 0;
|
---|
748 | bool from_ok = 0;
|
---|
749 | static const char options[] ALIGN1 =
|
---|
750 | "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0";
|
---|
751 |
|
---|
752 | memset(&req, 0, sizeof(req));
|
---|
753 |
|
---|
754 | iproute_reset_filter();
|
---|
755 |
|
---|
756 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
|
---|
757 | if (NLM_F_REQUEST)
|
---|
758 | req.n.nlmsg_flags = NLM_F_REQUEST;
|
---|
759 | if (RTM_GETROUTE)
|
---|
760 | req.n.nlmsg_type = RTM_GETROUTE;
|
---|
761 | req.r.rtm_family = preferred_family;
|
---|
762 | /*req.r.rtm_table = 0; - memset did this already */
|
---|
763 | /*req.r.rtm_protocol = 0;*/
|
---|
764 | /*req.r.rtm_scope = 0;*/
|
---|
765 | /*req.r.rtm_type = 0;*/
|
---|
766 | /*req.r.rtm_src_len = 0;*/
|
---|
767 | /*req.r.rtm_dst_len = 0;*/
|
---|
768 | /*req.r.rtm_tos = 0;*/
|
---|
769 |
|
---|
770 | while (*argv) {
|
---|
771 | switch (index_in_strings(options, *argv)) {
|
---|
772 | case 0: /* from */
|
---|
773 | {
|
---|
774 | inet_prefix addr;
|
---|
775 | NEXT_ARG();
|
---|
776 | from_ok = 1;
|
---|
777 | get_prefix(&addr, *argv, req.r.rtm_family);
|
---|
778 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
779 | req.r.rtm_family = addr.family;
|
---|
780 | }
|
---|
781 | if (addr.bytelen) {
|
---|
782 | addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
|
---|
783 | }
|
---|
784 | req.r.rtm_src_len = addr.bitlen;
|
---|
785 | break;
|
---|
786 | }
|
---|
787 | case 1: /* iif */
|
---|
788 | NEXT_ARG();
|
---|
789 | idev = *argv;
|
---|
790 | break;
|
---|
791 | case 2: /* oif */
|
---|
792 | case 3: /* dev */
|
---|
793 | NEXT_ARG();
|
---|
794 | odev = *argv;
|
---|
795 | break;
|
---|
796 | case 4: /* notify */
|
---|
797 | req.r.rtm_flags |= RTM_F_NOTIFY;
|
---|
798 | break;
|
---|
799 | case 5: /* connected */
|
---|
800 | connected = 1;
|
---|
801 | break;
|
---|
802 | case 6: /* to */
|
---|
803 | NEXT_ARG();
|
---|
804 | default:
|
---|
805 | {
|
---|
806 | inet_prefix addr;
|
---|
807 | get_prefix(&addr, *argv, req.r.rtm_family);
|
---|
808 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
809 | req.r.rtm_family = addr.family;
|
---|
810 | }
|
---|
811 | if (addr.bytelen) {
|
---|
812 | addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
|
---|
813 | }
|
---|
814 | req.r.rtm_dst_len = addr.bitlen;
|
---|
815 | }
|
---|
816 | }
|
---|
817 | argv++;
|
---|
818 | }
|
---|
819 |
|
---|
820 | if (req.r.rtm_dst_len == 0) {
|
---|
821 | bb_error_msg_and_die("need at least destination address");
|
---|
822 | }
|
---|
823 |
|
---|
824 | xrtnl_open(&rth);
|
---|
825 |
|
---|
826 | ll_init_map(&rth);
|
---|
827 |
|
---|
828 | if (idev || odev) {
|
---|
829 | int idx;
|
---|
830 |
|
---|
831 | if (idev) {
|
---|
832 | idx = xll_name_to_index(idev);
|
---|
833 | addattr32(&req.n, sizeof(req), RTA_IIF, idx);
|
---|
834 | }
|
---|
835 | if (odev) {
|
---|
836 | idx = xll_name_to_index(odev);
|
---|
837 | addattr32(&req.n, sizeof(req), RTA_OIF, idx);
|
---|
838 | }
|
---|
839 | }
|
---|
840 |
|
---|
841 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
842 | req.r.rtm_family = AF_INET;
|
---|
843 | }
|
---|
844 |
|
---|
845 | if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
|
---|
846 | return 2;
|
---|
847 | }
|
---|
848 |
|
---|
849 | if (connected && !from_ok) {
|
---|
850 | struct rtmsg *r = NLMSG_DATA(&req.n);
|
---|
851 | int len = req.n.nlmsg_len;
|
---|
852 | struct rtattr * tb[RTA_MAX+1];
|
---|
853 |
|
---|
854 | print_route(NULL, &req.n, NULL);
|
---|
855 |
|
---|
856 | if (req.n.nlmsg_type != RTM_NEWROUTE) {
|
---|
857 | bb_error_msg_and_die("not a route?");
|
---|
858 | }
|
---|
859 | len -= NLMSG_LENGTH(sizeof(*r));
|
---|
860 | if (len < 0) {
|
---|
861 | bb_error_msg_and_die("wrong len %d", len);
|
---|
862 | }
|
---|
863 |
|
---|
864 | memset(tb, 0, sizeof(tb));
|
---|
865 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
|
---|
866 |
|
---|
867 | if (tb[RTA_PREFSRC]) {
|
---|
868 | tb[RTA_PREFSRC]->rta_type = RTA_SRC;
|
---|
869 | r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
|
---|
870 | } else if (!tb[RTA_SRC]) {
|
---|
871 | bb_error_msg_and_die("can't connect the route");
|
---|
872 | }
|
---|
873 | if (!odev && tb[RTA_OIF]) {
|
---|
874 | tb[RTA_OIF]->rta_type = 0;
|
---|
875 | }
|
---|
876 | if (tb[RTA_GATEWAY]) {
|
---|
877 | tb[RTA_GATEWAY]->rta_type = 0;
|
---|
878 | }
|
---|
879 | if (!idev && tb[RTA_IIF]) {
|
---|
880 | tb[RTA_IIF]->rta_type = 0;
|
---|
881 | }
|
---|
882 | req.n.nlmsg_flags = NLM_F_REQUEST;
|
---|
883 | req.n.nlmsg_type = RTM_GETROUTE;
|
---|
884 |
|
---|
885 | if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
|
---|
886 | return 2;
|
---|
887 | }
|
---|
888 | }
|
---|
889 | print_route(NULL, &req.n, NULL);
|
---|
890 | return 0;
|
---|
891 | }
|
---|
892 |
|
---|
893 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
894 | int FAST_FUNC do_iproute(char **argv)
|
---|
895 | {
|
---|
896 | static const char ip_route_commands[] ALIGN1 =
|
---|
897 | /*0-3*/ "add\0""append\0""change\0""chg\0"
|
---|
898 | /*4-7*/ "delete\0""get\0""list\0""show\0"
|
---|
899 | /*8..*/ "prepend\0""replace\0""test\0""flush\0";
|
---|
900 | int command_num;
|
---|
901 | unsigned flags = 0;
|
---|
902 | int cmd = RTM_NEWROUTE;
|
---|
903 |
|
---|
904 | if (!*argv)
|
---|
905 | return iproute_list_or_flush(argv, 0);
|
---|
906 |
|
---|
907 | /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */
|
---|
908 | /* It probably means that it is using "first match" rule */
|
---|
909 | command_num = index_in_substrings(ip_route_commands, *argv);
|
---|
910 |
|
---|
911 | switch (command_num) {
|
---|
912 | case 0: /* add */
|
---|
913 | flags = NLM_F_CREATE|NLM_F_EXCL;
|
---|
914 | break;
|
---|
915 | case 1: /* append */
|
---|
916 | flags = NLM_F_CREATE|NLM_F_APPEND;
|
---|
917 | break;
|
---|
918 | case 2: /* change */
|
---|
919 | case 3: /* chg */
|
---|
920 | flags = NLM_F_REPLACE;
|
---|
921 | break;
|
---|
922 | case 4: /* delete */
|
---|
923 | cmd = RTM_DELROUTE;
|
---|
924 | break;
|
---|
925 | case 5: /* get */
|
---|
926 | return iproute_get(argv+1);
|
---|
927 | case 6: /* list */
|
---|
928 | case 7: /* show */
|
---|
929 | return iproute_list_or_flush(argv+1, 0);
|
---|
930 | case 8: /* prepend */
|
---|
931 | flags = NLM_F_CREATE;
|
---|
932 | break;
|
---|
933 | case 9: /* replace */
|
---|
934 | flags = NLM_F_CREATE|NLM_F_REPLACE;
|
---|
935 | break;
|
---|
936 | case 10: /* test */
|
---|
937 | flags = NLM_F_EXCL;
|
---|
938 | break;
|
---|
939 | case 11: /* flush */
|
---|
940 | return iproute_list_or_flush(argv+1, 1);
|
---|
941 | default:
|
---|
942 | bb_error_msg_and_die("unknown command %s", *argv);
|
---|
943 | }
|
---|
944 |
|
---|
945 | return iproute_modify(cmd, flags, argv+1);
|
---|
946 | }
|
---|