1 | /* vi: set sw=4 ts=4: */ |
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2 | /* |
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3 | * iproute.c "ip route". |
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4 | * |
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5 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
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6 | * |
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7 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
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8 | * |
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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 | * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized |
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14 | */ |
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15 | |
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16 | #include "ip_common.h" /* #include "libbb.h" is inside */ |
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17 | #include "rt_names.h" |
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18 | #include "utils.h" |
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19 | |
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20 | #ifndef RTAX_RTTVAR |
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21 | #define RTAX_RTTVAR RTAX_HOPS |
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22 | #endif |
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23 | |
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24 | |
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25 | typedef struct filter_t { |
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26 | int tb; |
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27 | int flushed; |
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28 | char *flushb; |
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29 | int flushp; |
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30 | int flushe; |
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31 | struct rtnl_handle *rth; |
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32 | int protocol, protocolmask; |
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33 | int scope, scopemask; |
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34 | int type, typemask; |
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35 | int tos, tosmask; |
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36 | int iif, iifmask; |
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37 | int oif, oifmask; |
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38 | int realm, realmmask; |
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39 | inet_prefix rprefsrc; |
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40 | inet_prefix rvia; |
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41 | inet_prefix rdst; |
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42 | inet_prefix mdst; |
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43 | inet_prefix rsrc; |
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44 | inet_prefix msrc; |
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45 | } filter_t; |
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46 | |
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47 | #define filter (*(filter_t*)&bb_common_bufsiz1) |
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48 | |
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49 | static int flush_update(void) |
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50 | { |
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51 | if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) { |
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52 | bb_perror_msg("failed to send flush request"); |
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53 | return -1; |
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54 | } |
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55 | filter.flushp = 0; |
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56 | return 0; |
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57 | } |
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58 | |
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59 | static unsigned get_hz(void) |
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60 | { |
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61 | static unsigned hz_internal; |
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62 | FILE *fp; |
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63 | |
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64 | if (hz_internal) |
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65 | return hz_internal; |
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66 | |
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67 | fp = fopen("/proc/net/psched", "r"); |
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68 | if (fp) { |
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69 | unsigned nom, denom; |
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70 | |
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71 | if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2) |
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72 | if (nom == 1000000) |
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73 | hz_internal = denom; |
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74 | fclose(fp); |
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75 | } |
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76 | if (!hz_internal) |
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77 | hz_internal = sysconf(_SC_CLK_TCK); |
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78 | return hz_internal; |
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79 | } |
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80 | |
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81 | static int print_route(struct sockaddr_nl *who ATTRIBUTE_UNUSED, |
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82 | struct nlmsghdr *n, void *arg) |
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83 | { |
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84 | FILE *fp = (FILE*)arg; |
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85 | struct rtmsg *r = NLMSG_DATA(n); |
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86 | int len = n->nlmsg_len; |
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87 | struct rtattr * tb[RTA_MAX+1]; |
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88 | char abuf[256]; |
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89 | inet_prefix dst; |
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90 | inet_prefix src; |
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91 | int host_len = -1; |
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92 | SPRINT_BUF(b1); |
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93 | |
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94 | |
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95 | if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) { |
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96 | fprintf(stderr, "Not a route: %08x %08x %08x\n", |
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97 | n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags); |
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98 | return 0; |
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99 | } |
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100 | if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE) |
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101 | return 0; |
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102 | len -= NLMSG_LENGTH(sizeof(*r)); |
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103 | if (len < 0) |
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104 | bb_error_msg_and_die("wrong nlmsg len %d", len); |
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105 | |
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106 | if (r->rtm_family == AF_INET6) |
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107 | host_len = 128; |
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108 | else if (r->rtm_family == AF_INET) |
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109 | host_len = 32; |
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110 | |
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111 | if (r->rtm_family == AF_INET6) { |
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112 | if (filter.tb) { |
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113 | if (filter.tb < 0) { |
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114 | if (!(r->rtm_flags&RTM_F_CLONED)) { |
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115 | return 0; |
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116 | } |
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117 | } else { |
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118 | if (r->rtm_flags&RTM_F_CLONED) { |
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119 | return 0; |
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120 | } |
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121 | if (filter.tb == RT_TABLE_LOCAL) { |
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122 | if (r->rtm_type != RTN_LOCAL) { |
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123 | return 0; |
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124 | } |
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125 | } else if (filter.tb == RT_TABLE_MAIN) { |
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126 | if (r->rtm_type == RTN_LOCAL) { |
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127 | return 0; |
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128 | } |
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129 | } else { |
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130 | return 0; |
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131 | } |
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132 | } |
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133 | } |
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134 | } else { |
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135 | if (filter.tb > 0 && filter.tb != r->rtm_table) { |
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136 | return 0; |
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137 | } |
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138 | } |
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139 | if (filter.rdst.family && |
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140 | (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len)) { |
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141 | return 0; |
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142 | } |
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143 | if (filter.mdst.family && |
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144 | (r->rtm_family != filter.mdst.family || |
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145 | (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len))) { |
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146 | return 0; |
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147 | } |
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148 | if (filter.rsrc.family && |
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149 | (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len)) { |
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150 | return 0; |
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151 | } |
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152 | if (filter.msrc.family && |
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153 | (r->rtm_family != filter.msrc.family || |
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154 | (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len))) { |
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155 | return 0; |
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156 | } |
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157 | |
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158 | memset(tb, 0, sizeof(tb)); |
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159 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); |
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160 | |
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161 | if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen)) |
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162 | return 0; |
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163 | if (filter.mdst.family && filter.mdst.bitlen >= 0 && |
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164 | inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len)) |
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165 | return 0; |
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166 | |
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167 | if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen)) |
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168 | return 0; |
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169 | if (filter.msrc.family && filter.msrc.bitlen >= 0 && |
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170 | inet_addr_match(&src, &filter.msrc, r->rtm_src_len)) |
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171 | return 0; |
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172 | |
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173 | if (filter.flushb && |
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174 | r->rtm_family == AF_INET6 && |
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175 | r->rtm_dst_len == 0 && |
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176 | r->rtm_type == RTN_UNREACHABLE && |
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177 | tb[RTA_PRIORITY] && |
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178 | *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1) |
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179 | return 0; |
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180 | |
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181 | if (filter.flushb) { |
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182 | struct nlmsghdr *fn; |
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183 | if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) { |
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184 | if (flush_update()) |
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185 | bb_error_msg_and_die("flush"); |
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186 | } |
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187 | fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp)); |
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188 | memcpy(fn, n, n->nlmsg_len); |
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189 | fn->nlmsg_type = RTM_DELROUTE; |
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190 | fn->nlmsg_flags = NLM_F_REQUEST; |
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191 | fn->nlmsg_seq = ++filter.rth->seq; |
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192 | filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb; |
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193 | filter.flushed++; |
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194 | return 0; |
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195 | } |
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196 | |
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197 | if (n->nlmsg_type == RTM_DELROUTE) { |
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198 | fprintf(fp, "Deleted "); |
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199 | } |
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200 | if (r->rtm_type != RTN_UNICAST && !filter.type) { |
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201 | fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1))); |
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202 | } |
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203 | |
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204 | if (tb[RTA_DST]) { |
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205 | if (r->rtm_dst_len != host_len) { |
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206 | fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family, |
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207 | RTA_PAYLOAD(tb[RTA_DST]), |
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208 | RTA_DATA(tb[RTA_DST]), |
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209 | abuf, sizeof(abuf)), |
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210 | r->rtm_dst_len |
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211 | ); |
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212 | } else { |
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213 | fprintf(fp, "%s ", format_host(r->rtm_family, |
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214 | RTA_PAYLOAD(tb[RTA_DST]), |
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215 | RTA_DATA(tb[RTA_DST]), |
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216 | abuf, sizeof(abuf)) |
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217 | ); |
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218 | } |
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219 | } else if (r->rtm_dst_len) { |
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220 | fprintf(fp, "0/%d ", r->rtm_dst_len); |
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221 | } else { |
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222 | fprintf(fp, "default "); |
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223 | } |
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224 | if (tb[RTA_SRC]) { |
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225 | if (r->rtm_src_len != host_len) { |
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226 | fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family, |
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227 | RTA_PAYLOAD(tb[RTA_SRC]), |
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228 | RTA_DATA(tb[RTA_SRC]), |
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229 | abuf, sizeof(abuf)), |
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230 | r->rtm_src_len |
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231 | ); |
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232 | } else { |
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233 | fprintf(fp, "from %s ", format_host(r->rtm_family, |
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234 | RTA_PAYLOAD(tb[RTA_SRC]), |
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235 | RTA_DATA(tb[RTA_SRC]), |
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236 | abuf, sizeof(abuf)) |
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237 | ); |
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238 | } |
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239 | } else if (r->rtm_src_len) { |
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240 | fprintf(fp, "from 0/%u ", r->rtm_src_len); |
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241 | } |
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242 | if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) { |
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243 | fprintf(fp, "via %s ", |
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244 | format_host(r->rtm_family, |
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245 | RTA_PAYLOAD(tb[RTA_GATEWAY]), |
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246 | RTA_DATA(tb[RTA_GATEWAY]), |
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247 | abuf, sizeof(abuf))); |
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248 | } |
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249 | if (tb[RTA_OIF] && filter.oifmask != -1) { |
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250 | fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF]))); |
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251 | } |
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252 | |
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253 | if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) { |
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254 | /* Do not use format_host(). It is our local addr |
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255 | and symbolic name will not be useful. |
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256 | */ |
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257 | fprintf(fp, " src %s ", |
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258 | rt_addr_n2a(r->rtm_family, |
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259 | RTA_PAYLOAD(tb[RTA_PREFSRC]), |
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260 | RTA_DATA(tb[RTA_PREFSRC]), |
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261 | abuf, sizeof(abuf))); |
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262 | } |
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263 | if (tb[RTA_PRIORITY]) { |
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264 | fprintf(fp, " metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY])); |
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265 | } |
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266 | if (r->rtm_family == AF_INET6) { |
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267 | struct rta_cacheinfo *ci = NULL; |
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268 | if (tb[RTA_CACHEINFO]) { |
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269 | ci = RTA_DATA(tb[RTA_CACHEINFO]); |
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270 | } |
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271 | if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) { |
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272 | if (r->rtm_flags & RTM_F_CLONED) { |
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273 | fprintf(fp, "%c cache ", _SL_); |
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274 | } |
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275 | if (ci->rta_expires) { |
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276 | fprintf(fp, " expires %dsec", ci->rta_expires / get_hz()); |
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277 | } |
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278 | if (ci->rta_error != 0) { |
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279 | fprintf(fp, " error %d", ci->rta_error); |
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280 | } |
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281 | } else if (ci) { |
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282 | if (ci->rta_error != 0) |
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283 | fprintf(fp, " error %d", ci->rta_error); |
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284 | } |
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285 | } |
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286 | if (tb[RTA_IIF] && filter.iifmask != -1) { |
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287 | fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF]))); |
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288 | } |
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289 | fputc('\n', fp); |
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290 | fflush(fp); |
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291 | return 0; |
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292 | } |
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293 | |
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294 | /* Return value becomes exitcode. It's okay to not return at all */ |
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295 | static int iproute_modify(int cmd, unsigned flags, int argc, char **argv) |
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296 | { |
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297 | static const char keywords[] ALIGN1 = |
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298 | "src\0""via\0""mtu\0""lock\0""protocol\0"USE_FEATURE_IP_RULE("table\0") |
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299 | "dev\0""oif\0""to\0"; |
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300 | enum { |
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301 | ARG_src, |
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302 | ARG_via, |
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303 | ARG_mtu, PARM_lock, |
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304 | ARG_protocol, |
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305 | USE_FEATURE_IP_RULE(ARG_table,) |
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306 | ARG_dev, |
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307 | ARG_oif, |
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308 | ARG_to |
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309 | }; |
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310 | enum { |
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311 | gw_ok = 1 << 0, |
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312 | dst_ok = 1 << 1, |
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313 | proto_ok = 1 << 2, |
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314 | type_ok = 1 << 3 |
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315 | }; |
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316 | struct rtnl_handle rth; |
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317 | struct { |
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318 | struct nlmsghdr n; |
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319 | struct rtmsg r; |
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320 | char buf[1024]; |
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321 | } req; |
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322 | char mxbuf[256]; |
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323 | struct rtattr * mxrta = (void*)mxbuf; |
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324 | unsigned mxlock = 0; |
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325 | char *d = NULL; |
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326 | smalluint ok = 0; |
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327 | int arg; |
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328 | |
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329 | memset(&req, 0, sizeof(req)); |
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330 | |
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331 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
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332 | req.n.nlmsg_flags = NLM_F_REQUEST|flags; |
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333 | req.n.nlmsg_type = cmd; |
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334 | req.r.rtm_family = preferred_family; |
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335 | req.r.rtm_table = RT_TABLE_MAIN; |
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336 | req.r.rtm_scope = RT_SCOPE_NOWHERE; |
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337 | |
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338 | if (cmd != RTM_DELROUTE) { |
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339 | req.r.rtm_protocol = RTPROT_BOOT; |
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340 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
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341 | req.r.rtm_type = RTN_UNICAST; |
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342 | } |
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343 | |
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344 | mxrta->rta_type = RTA_METRICS; |
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345 | mxrta->rta_len = RTA_LENGTH(0); |
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346 | |
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347 | while (argc > 0) { |
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348 | arg = index_in_substrings(keywords, *argv); |
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349 | if (arg == ARG_src) { |
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350 | inet_prefix addr; |
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351 | NEXT_ARG(); |
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352 | get_addr(&addr, *argv, req.r.rtm_family); |
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353 | if (req.r.rtm_family == AF_UNSPEC) |
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354 | req.r.rtm_family = addr.family; |
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355 | addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen); |
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356 | } else if (arg == ARG_via) { |
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357 | inet_prefix addr; |
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358 | ok |= gw_ok; |
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359 | NEXT_ARG(); |
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360 | get_addr(&addr, *argv, req.r.rtm_family); |
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361 | if (req.r.rtm_family == AF_UNSPEC) { |
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362 | req.r.rtm_family = addr.family; |
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363 | } |
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364 | addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen); |
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365 | } else if (arg == ARG_mtu) { |
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366 | unsigned mtu; |
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367 | NEXT_ARG(); |
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368 | if (index_in_strings(keywords, *argv) == PARM_lock) { |
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369 | mxlock |= (1<<RTAX_MTU); |
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370 | NEXT_ARG(); |
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371 | } |
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372 | if (get_unsigned(&mtu, *argv, 0)) |
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373 | invarg(*argv, "mtu"); |
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374 | rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu); |
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375 | } else if (arg == ARG_protocol) { |
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376 | uint32_t prot; |
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377 | NEXT_ARG(); |
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378 | if (rtnl_rtprot_a2n(&prot, *argv)) |
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379 | invarg(*argv, "protocol"); |
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380 | req.r.rtm_protocol = prot; |
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381 | ok |= proto_ok; |
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382 | #if ENABLE_FEATURE_IP_RULE |
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383 | } else if (arg == ARG_table) { |
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384 | uint32_t tid; |
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385 | NEXT_ARG(); |
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386 | if (rtnl_rttable_a2n(&tid, *argv)) |
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387 | invarg(*argv, "table"); |
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388 | req.r.rtm_table = tid; |
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389 | #endif |
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390 | } else if (arg == ARG_dev || arg == ARG_oif) { |
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391 | NEXT_ARG(); |
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392 | d = *argv; |
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393 | } else { |
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394 | int type; |
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395 | inet_prefix dst; |
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396 | |
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397 | if (arg == ARG_to) { |
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398 | NEXT_ARG(); |
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399 | } |
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400 | if ((**argv < '0' || **argv > '9') |
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401 | && rtnl_rtntype_a2n(&type, *argv) == 0) { |
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402 | NEXT_ARG(); |
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403 | req.r.rtm_type = type; |
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404 | ok |= type_ok; |
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405 | } |
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406 | |
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407 | if (ok & dst_ok) { |
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408 | duparg2("to", *argv); |
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409 | } |
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410 | get_prefix(&dst, *argv, req.r.rtm_family); |
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411 | if (req.r.rtm_family == AF_UNSPEC) { |
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412 | req.r.rtm_family = dst.family; |
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413 | } |
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414 | req.r.rtm_dst_len = dst.bitlen; |
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415 | ok |= dst_ok; |
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416 | if (dst.bytelen) { |
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417 | addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen); |
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418 | } |
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419 | } |
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420 | argc--; argv++; |
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421 | } |
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422 | |
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423 | xrtnl_open(&rth); |
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424 | |
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425 | if (d) { |
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426 | int idx; |
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427 | |
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428 | ll_init_map(&rth); |
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429 | |
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430 | if (d) { |
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431 | idx = xll_name_to_index(d); |
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432 | addattr32(&req.n, sizeof(req), RTA_OIF, idx); |
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433 | } |
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434 | } |
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435 | |
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436 | if (mxrta->rta_len > RTA_LENGTH(0)) { |
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437 | if (mxlock) { |
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438 | rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock); |
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439 | } |
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440 | addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta)); |
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441 | } |
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442 | |
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443 | if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT) |
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444 | req.r.rtm_scope = RT_SCOPE_HOST; |
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445 | else if (req.r.rtm_type == RTN_BROADCAST || |
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446 | req.r.rtm_type == RTN_MULTICAST || |
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447 | req.r.rtm_type == RTN_ANYCAST) |
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448 | req.r.rtm_scope = RT_SCOPE_LINK; |
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449 | else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) { |
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450 | if (cmd == RTM_DELROUTE) |
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451 | req.r.rtm_scope = RT_SCOPE_NOWHERE; |
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452 | else if (!(ok & gw_ok)) |
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453 | req.r.rtm_scope = RT_SCOPE_LINK; |
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454 | } |
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455 | |
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456 | if (req.r.rtm_family == AF_UNSPEC) { |
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457 | req.r.rtm_family = AF_INET; |
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458 | } |
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459 | |
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460 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) { |
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461 | return 2; |
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462 | } |
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463 | |
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464 | return 0; |
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465 | } |
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466 | |
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467 | static int rtnl_rtcache_request(struct rtnl_handle *rth, int family) |
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468 | { |
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469 | struct { |
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470 | struct nlmsghdr nlh; |
---|
471 | struct rtmsg rtm; |
---|
472 | } req; |
---|
473 | struct sockaddr_nl nladdr; |
---|
474 | |
---|
475 | memset(&nladdr, 0, sizeof(nladdr)); |
---|
476 | memset(&req, 0, sizeof(req)); |
---|
477 | nladdr.nl_family = AF_NETLINK; |
---|
478 | |
---|
479 | req.nlh.nlmsg_len = sizeof(req); |
---|
480 | req.nlh.nlmsg_type = RTM_GETROUTE; |
---|
481 | req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST; |
---|
482 | req.nlh.nlmsg_pid = 0; |
---|
483 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq; |
---|
484 | req.rtm.rtm_family = family; |
---|
485 | req.rtm.rtm_flags |= RTM_F_CLONED; |
---|
486 | |
---|
487 | return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr)); |
---|
488 | } |
---|
489 | |
---|
490 | static void iproute_flush_cache(void) |
---|
491 | { |
---|
492 | static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush"; |
---|
493 | int flush_fd = open_or_warn(fn, O_WRONLY); |
---|
494 | |
---|
495 | if (flush_fd < 0) { |
---|
496 | return; |
---|
497 | } |
---|
498 | |
---|
499 | if (write(flush_fd, "-1", 2) < 2) { |
---|
500 | bb_perror_msg("cannot flush routing cache"); |
---|
501 | return; |
---|
502 | } |
---|
503 | close(flush_fd); |
---|
504 | } |
---|
505 | |
---|
506 | static void iproute_reset_filter(void) |
---|
507 | { |
---|
508 | memset(&filter, 0, sizeof(filter)); |
---|
509 | filter.mdst.bitlen = -1; |
---|
510 | filter.msrc.bitlen = -1; |
---|
511 | } |
---|
512 | |
---|
513 | /* Return value becomes exitcode. It's okay to not return at all */ |
---|
514 | static int iproute_list_or_flush(int argc, char **argv, int flush) |
---|
515 | { |
---|
516 | int do_ipv6 = preferred_family; |
---|
517 | struct rtnl_handle rth; |
---|
518 | char *id = NULL; |
---|
519 | char *od = NULL; |
---|
520 | static const char keywords[] ALIGN1 = |
---|
521 | "protocol\0""all\0""dev\0""oif\0""iif\0""via\0""table\0""cache\0" /*all*/ |
---|
522 | "from\0""root\0""match\0""exact\0""to\0"/*root match exact*/; |
---|
523 | enum { |
---|
524 | ARG_proto, PARM_all, |
---|
525 | ARG_dev, |
---|
526 | ARG_oif, |
---|
527 | ARG_iif, |
---|
528 | ARG_via, |
---|
529 | ARG_table, PARM_cache, /*PARM_all,*/ |
---|
530 | ARG_from, PARM_root, PARM_match, PARM_exact, |
---|
531 | ARG_to /*PARM_root, PARM_match, PARM_exact*/ |
---|
532 | }; |
---|
533 | int arg, parm; |
---|
534 | iproute_reset_filter(); |
---|
535 | filter.tb = RT_TABLE_MAIN; |
---|
536 | |
---|
537 | if (flush && argc <= 0) |
---|
538 | bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\""); |
---|
539 | |
---|
540 | while (argc > 0) { |
---|
541 | arg = index_in_substrings(keywords, *argv); |
---|
542 | if (arg == ARG_proto) { |
---|
543 | uint32_t prot = 0; |
---|
544 | NEXT_ARG(); |
---|
545 | filter.protocolmask = -1; |
---|
546 | if (rtnl_rtprot_a2n(&prot, *argv)) { |
---|
547 | if (index_in_strings(keywords, *argv) != PARM_all) |
---|
548 | invarg(*argv, "protocol"); |
---|
549 | prot = 0; |
---|
550 | filter.protocolmask = 0; |
---|
551 | } |
---|
552 | filter.protocol = prot; |
---|
553 | } else if (arg == ARG_dev || arg == ARG_oif) { |
---|
554 | NEXT_ARG(); |
---|
555 | od = *argv; |
---|
556 | } else if (arg == ARG_iif) { |
---|
557 | NEXT_ARG(); |
---|
558 | id = *argv; |
---|
559 | } else if (arg == ARG_via) { |
---|
560 | NEXT_ARG(); |
---|
561 | get_prefix(&filter.rvia, *argv, do_ipv6); |
---|
562 | } else if (arg == ARG_table) { |
---|
563 | NEXT_ARG(); |
---|
564 | parm = index_in_substrings(keywords, *argv); |
---|
565 | if (parm == PARM_cache) |
---|
566 | filter.tb = -1; |
---|
567 | else if (parm == PARM_all) |
---|
568 | filter.tb = 0; |
---|
569 | else |
---|
570 | invarg(*argv, "table"); |
---|
571 | } else if (arg == ARG_from) { |
---|
572 | NEXT_ARG(); |
---|
573 | parm = index_in_substrings(keywords, *argv); |
---|
574 | if (parm == PARM_root) { |
---|
575 | NEXT_ARG(); |
---|
576 | get_prefix(&filter.rsrc, *argv, do_ipv6); |
---|
577 | } else if (parm == PARM_match) { |
---|
578 | NEXT_ARG(); |
---|
579 | get_prefix(&filter.msrc, *argv, do_ipv6); |
---|
580 | } else { |
---|
581 | if (parm == PARM_exact) |
---|
582 | NEXT_ARG(); |
---|
583 | get_prefix(&filter.msrc, *argv, do_ipv6); |
---|
584 | filter.rsrc = filter.msrc; |
---|
585 | } |
---|
586 | } else { |
---|
587 | /* parm = arg; // would be more plausible, we reuse arg here */ |
---|
588 | if (arg == ARG_to) { |
---|
589 | NEXT_ARG(); |
---|
590 | arg = index_in_substrings(keywords, *argv); |
---|
591 | } |
---|
592 | if (arg == PARM_root) { |
---|
593 | NEXT_ARG(); |
---|
594 | get_prefix(&filter.rdst, *argv, do_ipv6); |
---|
595 | } else if (arg == PARM_match) { |
---|
596 | NEXT_ARG(); |
---|
597 | get_prefix(&filter.mdst, *argv, do_ipv6); |
---|
598 | } else { |
---|
599 | if (arg == PARM_exact) |
---|
600 | NEXT_ARG(); |
---|
601 | get_prefix(&filter.mdst, *argv, do_ipv6); |
---|
602 | filter.rdst = filter.mdst; |
---|
603 | } |
---|
604 | } |
---|
605 | argc--; |
---|
606 | argv++; |
---|
607 | } |
---|
608 | |
---|
609 | if (do_ipv6 == AF_UNSPEC && filter.tb) { |
---|
610 | do_ipv6 = AF_INET; |
---|
611 | } |
---|
612 | |
---|
613 | xrtnl_open(&rth); |
---|
614 | |
---|
615 | ll_init_map(&rth); |
---|
616 | |
---|
617 | if (id || od) { |
---|
618 | int idx; |
---|
619 | |
---|
620 | if (id) { |
---|
621 | idx = xll_name_to_index(id); |
---|
622 | filter.iif = idx; |
---|
623 | filter.iifmask = -1; |
---|
624 | } |
---|
625 | if (od) { |
---|
626 | idx = xll_name_to_index(od); |
---|
627 | filter.oif = idx; |
---|
628 | filter.oifmask = -1; |
---|
629 | } |
---|
630 | } |
---|
631 | |
---|
632 | if (flush) { |
---|
633 | char flushb[4096-512]; |
---|
634 | |
---|
635 | if (filter.tb == -1) { |
---|
636 | if (do_ipv6 != AF_INET6) |
---|
637 | iproute_flush_cache(); |
---|
638 | if (do_ipv6 == AF_INET) |
---|
639 | return 0; |
---|
640 | } |
---|
641 | |
---|
642 | filter.flushb = flushb; |
---|
643 | filter.flushp = 0; |
---|
644 | filter.flushe = sizeof(flushb); |
---|
645 | filter.rth = &rth; |
---|
646 | |
---|
647 | for (;;) { |
---|
648 | xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE); |
---|
649 | filter.flushed = 0; |
---|
650 | xrtnl_dump_filter(&rth, print_route, stdout); |
---|
651 | if (filter.flushed == 0) |
---|
652 | return 0; |
---|
653 | if (flush_update()) |
---|
654 | return 1; |
---|
655 | } |
---|
656 | } |
---|
657 | |
---|
658 | if (filter.tb != -1) { |
---|
659 | xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE); |
---|
660 | } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) { |
---|
661 | bb_perror_msg_and_die("cannot send dump request"); |
---|
662 | } |
---|
663 | xrtnl_dump_filter(&rth, print_route, stdout); |
---|
664 | |
---|
665 | return 0; |
---|
666 | } |
---|
667 | |
---|
668 | |
---|
669 | /* Return value becomes exitcode. It's okay to not return at all */ |
---|
670 | static int iproute_get(int argc, char **argv) |
---|
671 | { |
---|
672 | struct rtnl_handle rth; |
---|
673 | struct { |
---|
674 | struct nlmsghdr n; |
---|
675 | struct rtmsg r; |
---|
676 | char buf[1024]; |
---|
677 | } req; |
---|
678 | char *idev = NULL; |
---|
679 | char *odev = NULL; |
---|
680 | bool connected = 0; |
---|
681 | bool from_ok = 0; |
---|
682 | static const char options[] ALIGN1 = |
---|
683 | "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0"; |
---|
684 | |
---|
685 | memset(&req, 0, sizeof(req)); |
---|
686 | |
---|
687 | iproute_reset_filter(); |
---|
688 | |
---|
689 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
---|
690 | req.n.nlmsg_flags = NLM_F_REQUEST; |
---|
691 | req.n.nlmsg_type = RTM_GETROUTE; |
---|
692 | req.r.rtm_family = preferred_family; |
---|
693 | req.r.rtm_table = 0; |
---|
694 | req.r.rtm_protocol = 0; |
---|
695 | req.r.rtm_scope = 0; |
---|
696 | req.r.rtm_type = 0; |
---|
697 | req.r.rtm_src_len = 0; |
---|
698 | req.r.rtm_dst_len = 0; |
---|
699 | req.r.rtm_tos = 0; |
---|
700 | |
---|
701 | while (argc > 0) { |
---|
702 | switch (index_in_strings(options, *argv)) { |
---|
703 | case 0: /* from */ |
---|
704 | { |
---|
705 | inet_prefix addr; |
---|
706 | NEXT_ARG(); |
---|
707 | from_ok = 1; |
---|
708 | get_prefix(&addr, *argv, req.r.rtm_family); |
---|
709 | if (req.r.rtm_family == AF_UNSPEC) { |
---|
710 | req.r.rtm_family = addr.family; |
---|
711 | } |
---|
712 | if (addr.bytelen) { |
---|
713 | addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen); |
---|
714 | } |
---|
715 | req.r.rtm_src_len = addr.bitlen; |
---|
716 | break; |
---|
717 | } |
---|
718 | case 1: /* iif */ |
---|
719 | NEXT_ARG(); |
---|
720 | idev = *argv; |
---|
721 | break; |
---|
722 | case 2: /* oif */ |
---|
723 | case 3: /* dev */ |
---|
724 | NEXT_ARG(); |
---|
725 | odev = *argv; |
---|
726 | break; |
---|
727 | case 4: /* notify */ |
---|
728 | req.r.rtm_flags |= RTM_F_NOTIFY; |
---|
729 | break; |
---|
730 | case 5: /* connected */ |
---|
731 | connected = 1; |
---|
732 | break; |
---|
733 | case 6: /* to */ |
---|
734 | NEXT_ARG(); |
---|
735 | default: |
---|
736 | { |
---|
737 | inet_prefix addr; |
---|
738 | get_prefix(&addr, *argv, req.r.rtm_family); |
---|
739 | if (req.r.rtm_family == AF_UNSPEC) { |
---|
740 | req.r.rtm_family = addr.family; |
---|
741 | } |
---|
742 | if (addr.bytelen) { |
---|
743 | addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen); |
---|
744 | } |
---|
745 | req.r.rtm_dst_len = addr.bitlen; |
---|
746 | } |
---|
747 | argc--; argv++; |
---|
748 | } |
---|
749 | } |
---|
750 | |
---|
751 | if (req.r.rtm_dst_len == 0) { |
---|
752 | bb_error_msg_and_die("need at least destination address"); |
---|
753 | } |
---|
754 | |
---|
755 | xrtnl_open(&rth); |
---|
756 | |
---|
757 | ll_init_map(&rth); |
---|
758 | |
---|
759 | if (idev || odev) { |
---|
760 | int idx; |
---|
761 | |
---|
762 | if (idev) { |
---|
763 | idx = xll_name_to_index(idev); |
---|
764 | addattr32(&req.n, sizeof(req), RTA_IIF, idx); |
---|
765 | } |
---|
766 | if (odev) { |
---|
767 | idx = xll_name_to_index(odev); |
---|
768 | addattr32(&req.n, sizeof(req), RTA_OIF, idx); |
---|
769 | } |
---|
770 | } |
---|
771 | |
---|
772 | if (req.r.rtm_family == AF_UNSPEC) { |
---|
773 | req.r.rtm_family = AF_INET; |
---|
774 | } |
---|
775 | |
---|
776 | if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) { |
---|
777 | return 2; |
---|
778 | } |
---|
779 | |
---|
780 | if (connected && !from_ok) { |
---|
781 | struct rtmsg *r = NLMSG_DATA(&req.n); |
---|
782 | int len = req.n.nlmsg_len; |
---|
783 | struct rtattr * tb[RTA_MAX+1]; |
---|
784 | |
---|
785 | print_route(NULL, &req.n, (void*)stdout); |
---|
786 | |
---|
787 | if (req.n.nlmsg_type != RTM_NEWROUTE) { |
---|
788 | bb_error_msg_and_die("not a route?"); |
---|
789 | } |
---|
790 | len -= NLMSG_LENGTH(sizeof(*r)); |
---|
791 | if (len < 0) { |
---|
792 | bb_error_msg_and_die("wrong len %d", len); |
---|
793 | } |
---|
794 | |
---|
795 | memset(tb, 0, sizeof(tb)); |
---|
796 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); |
---|
797 | |
---|
798 | if (tb[RTA_PREFSRC]) { |
---|
799 | tb[RTA_PREFSRC]->rta_type = RTA_SRC; |
---|
800 | r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]); |
---|
801 | } else if (!tb[RTA_SRC]) { |
---|
802 | bb_error_msg_and_die("failed to connect the route"); |
---|
803 | } |
---|
804 | if (!odev && tb[RTA_OIF]) { |
---|
805 | tb[RTA_OIF]->rta_type = 0; |
---|
806 | } |
---|
807 | if (tb[RTA_GATEWAY]) { |
---|
808 | tb[RTA_GATEWAY]->rta_type = 0; |
---|
809 | } |
---|
810 | if (!idev && tb[RTA_IIF]) { |
---|
811 | tb[RTA_IIF]->rta_type = 0; |
---|
812 | } |
---|
813 | req.n.nlmsg_flags = NLM_F_REQUEST; |
---|
814 | req.n.nlmsg_type = RTM_GETROUTE; |
---|
815 | |
---|
816 | if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) { |
---|
817 | return 2; |
---|
818 | } |
---|
819 | } |
---|
820 | print_route(NULL, &req.n, (void*)stdout); |
---|
821 | return 0; |
---|
822 | } |
---|
823 | |
---|
824 | /* Return value becomes exitcode. It's okay to not return at all */ |
---|
825 | int do_iproute(int argc, char **argv) |
---|
826 | { |
---|
827 | static const char ip_route_commands[] ALIGN1 = |
---|
828 | /*0-3*/ "add\0""append\0""change\0""chg\0" |
---|
829 | /*4-7*/ "delete\0""get\0""list\0""show\0" |
---|
830 | /*8..*/ "prepend\0""replace\0""test\0""flush\0"; |
---|
831 | int command_num = 6; |
---|
832 | unsigned flags = 0; |
---|
833 | int cmd = RTM_NEWROUTE; |
---|
834 | |
---|
835 | /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */ |
---|
836 | /* It probably means that it is using "first match" rule */ |
---|
837 | if (*argv) { |
---|
838 | command_num = index_in_substrings(ip_route_commands, *argv); |
---|
839 | } |
---|
840 | switch (command_num) { |
---|
841 | case 0: /* add */ |
---|
842 | flags = NLM_F_CREATE|NLM_F_EXCL; |
---|
843 | break; |
---|
844 | case 1: /* append */ |
---|
845 | flags = NLM_F_CREATE|NLM_F_APPEND; |
---|
846 | break; |
---|
847 | case 2: /* change */ |
---|
848 | case 3: /* chg */ |
---|
849 | flags = NLM_F_REPLACE; |
---|
850 | break; |
---|
851 | case 4: /* delete */ |
---|
852 | cmd = RTM_DELROUTE; |
---|
853 | break; |
---|
854 | case 5: /* get */ |
---|
855 | return iproute_get(argc-1, argv+1); |
---|
856 | case 6: /* list */ |
---|
857 | case 7: /* show */ |
---|
858 | return iproute_list_or_flush(argc-1, argv+1, 0); |
---|
859 | case 8: /* prepend */ |
---|
860 | flags = NLM_F_CREATE; |
---|
861 | case 9: /* replace */ |
---|
862 | flags = NLM_F_CREATE|NLM_F_REPLACE; |
---|
863 | case 10: /* test */ |
---|
864 | flags = NLM_F_EXCL; |
---|
865 | case 11: /* flush */ |
---|
866 | return iproute_list_or_flush(argc-1, argv+1, 1); |
---|
867 | default: |
---|
868 | bb_error_msg_and_die("unknown command %s", *argv); |
---|
869 | } |
---|
870 | |
---|
871 | return iproute_modify(cmd, flags, argc-1, argv+1); |
---|
872 | } |
---|