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1 #ifndef _NF_CONNTRACK_COMMON_H |
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2 #define _NF_CONNTRACK_COMMON_H |
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3 /* Connection state tracking for netfilter. This is separated from, |
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4 but required by, the NAT layer; it can also be used by an iptables |
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5 extension. */ |
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6 enum ip_conntrack_info |
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7 { |
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8 /* Part of an established connection (either direction). */ |
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9 IP_CT_ESTABLISHED, |
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10 |
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11 /* Like NEW, but related to an existing connection, or ICMP error |
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12 (in either direction). */ |
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13 IP_CT_RELATED, |
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14 |
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15 /* Started a new connection to track (only |
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16 IP_CT_DIR_ORIGINAL); may be a retransmission. */ |
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17 IP_CT_NEW, |
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18 |
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19 /* >= this indicates reply direction */ |
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20 IP_CT_IS_REPLY, |
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21 |
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22 /* Number of distinct IP_CT types (no NEW in reply dirn). */ |
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23 IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1 |
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24 }; |
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25 |
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26 /* Bitset representing status of connection. */ |
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27 enum ip_conntrack_status { |
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28 /* It's an expected connection: bit 0 set. This bit never changed */ |
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29 IPS_EXPECTED_BIT = 0, |
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30 IPS_EXPECTED = (1 << IPS_EXPECTED_BIT), |
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31 |
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32 /* We've seen packets both ways: bit 1 set. Can be set, not unset. */ |
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33 IPS_SEEN_REPLY_BIT = 1, |
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34 IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT), |
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35 |
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36 /* Conntrack should never be early-expired. */ |
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37 IPS_ASSURED_BIT = 2, |
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38 IPS_ASSURED = (1 << IPS_ASSURED_BIT), |
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39 |
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40 /* Connection is confirmed: originating packet has left box */ |
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41 IPS_CONFIRMED_BIT = 3, |
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42 IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT), |
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43 |
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44 /* Connection needs src nat in orig dir. This bit never changed. */ |
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45 IPS_SRC_NAT_BIT = 4, |
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46 IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT), |
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47 |
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48 /* Connection needs dst nat in orig dir. This bit never changed. */ |
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49 IPS_DST_NAT_BIT = 5, |
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50 IPS_DST_NAT = (1 << IPS_DST_NAT_BIT), |
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51 |
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52 /* Both together. */ |
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53 IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT), |
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54 |
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55 /* Connection needs TCP sequence adjusted. */ |
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56 IPS_SEQ_ADJUST_BIT = 6, |
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57 IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT), |
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58 |
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59 /* NAT initialization bits. */ |
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60 IPS_SRC_NAT_DONE_BIT = 7, |
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61 IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT), |
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62 |
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63 IPS_DST_NAT_DONE_BIT = 8, |
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64 IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT), |
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65 |
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66 /* Both together */ |
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67 IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE), |
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68 |
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69 /* Connection is dying (removed from lists), can not be unset. */ |
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70 IPS_DYING_BIT = 9, |
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71 IPS_DYING = (1 << IPS_DYING_BIT), |
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72 |
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73 /* Connection has fixed timeout. */ |
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74 IPS_FIXED_TIMEOUT_BIT = 10, |
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75 IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT), |
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76 }; |
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77 |
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78 /* Connection tracking event bits */ |
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79 enum ip_conntrack_events |
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80 { |
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81 /* New conntrack */ |
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82 IPCT_NEW_BIT = 0, |
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83 IPCT_NEW = (1 << IPCT_NEW_BIT), |
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84 |
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85 /* Expected connection */ |
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86 IPCT_RELATED_BIT = 1, |
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87 IPCT_RELATED = (1 << IPCT_RELATED_BIT), |
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88 |
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89 /* Destroyed conntrack */ |
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90 IPCT_DESTROY_BIT = 2, |
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91 IPCT_DESTROY = (1 << IPCT_DESTROY_BIT), |
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92 |
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93 /* Timer has been refreshed */ |
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94 IPCT_REFRESH_BIT = 3, |
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95 IPCT_REFRESH = (1 << IPCT_REFRESH_BIT), |
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96 |
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97 /* Status has changed */ |
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98 IPCT_STATUS_BIT = 4, |
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99 IPCT_STATUS = (1 << IPCT_STATUS_BIT), |
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100 |
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101 /* Update of protocol info */ |
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102 IPCT_PROTOINFO_BIT = 5, |
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103 IPCT_PROTOINFO = (1 << IPCT_PROTOINFO_BIT), |
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104 |
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105 /* Volatile protocol info */ |
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106 IPCT_PROTOINFO_VOLATILE_BIT = 6, |
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107 IPCT_PROTOINFO_VOLATILE = (1 << IPCT_PROTOINFO_VOLATILE_BIT), |
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108 |
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109 /* New helper for conntrack */ |
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110 IPCT_HELPER_BIT = 7, |
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111 IPCT_HELPER = (1 << IPCT_HELPER_BIT), |
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112 |
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113 /* Update of helper info */ |
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114 IPCT_HELPINFO_BIT = 8, |
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115 IPCT_HELPINFO = (1 << IPCT_HELPINFO_BIT), |
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116 |
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117 /* Volatile helper info */ |
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118 IPCT_HELPINFO_VOLATILE_BIT = 9, |
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119 IPCT_HELPINFO_VOLATILE = (1 << IPCT_HELPINFO_VOLATILE_BIT), |
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120 |
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121 /* NAT info */ |
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122 IPCT_NATINFO_BIT = 10, |
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123 IPCT_NATINFO = (1 << IPCT_NATINFO_BIT), |
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124 |
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125 /* Counter highest bit has been set, unused */ |
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126 IPCT_COUNTER_FILLING_BIT = 11, |
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127 IPCT_COUNTER_FILLING = (1 << IPCT_COUNTER_FILLING_BIT), |
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128 |
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129 /* Mark is set */ |
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130 IPCT_MARK_BIT = 12, |
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131 IPCT_MARK = (1 << IPCT_MARK_BIT), |
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132 |
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133 /* NAT sequence adjustment */ |
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134 IPCT_NATSEQADJ_BIT = 13, |
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135 IPCT_NATSEQADJ = (1 << IPCT_NATSEQADJ_BIT), |
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136 |
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137 /* Secmark is set */ |
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138 IPCT_SECMARK_BIT = 14, |
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139 IPCT_SECMARK = (1 << IPCT_SECMARK_BIT), |
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140 }; |
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141 |
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142 enum ip_conntrack_expect_events { |
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143 IPEXP_NEW_BIT = 0, |
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144 IPEXP_NEW = (1 << IPEXP_NEW_BIT), |
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145 }; |
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146 |
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147 #ifdef __KERNEL__ |
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148 struct ip_conntrack_stat |
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149 { |
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150 unsigned int searched; |
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151 unsigned int found; |
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152 unsigned int new; |
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153 unsigned int invalid; |
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154 unsigned int ignore; |
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155 unsigned int delete; |
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156 unsigned int delete_list; |
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157 unsigned int insert; |
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158 unsigned int insert_failed; |
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159 unsigned int drop; |
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160 unsigned int early_drop; |
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161 unsigned int error; |
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162 unsigned int expect_new; |
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163 unsigned int expect_create; |
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164 unsigned int expect_delete; |
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165 }; |
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166 |
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167 /* call to create an explicit dependency on nf_conntrack. */ |
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168 extern void need_conntrack(void); |
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169 |
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170 #endif /* __KERNEL__ */ |
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171 |
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172 #endif /* _NF_CONNTRACK_COMMON_H */ |