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1159 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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1514 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;; |
1159 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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1249 | hidnplayr | 6 | ;; IPv4.INC ;; |
1159 | hidnplayr | 7 | ;; ;; |
8 | ;; Part of the tcp/ip network stack for KolibriOS ;; |
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9 | ;; ;; |
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10 | ;; Based on the work of [Johnny_B] and [smb] ;; |
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11 | ;; ;; |
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12 | ;; Written by hidnplayr@kolibrios.org ;; |
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13 | ;; ;; |
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14 | ;; GNU GENERAL PUBLIC LICENSE ;; |
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15 | ;; Version 2, June 1991 ;; |
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16 | ;; ;; |
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17 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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18 | |||
1206 | hidnplayr | 19 | $Revision: 1541 $ |
1159 | hidnplayr | 20 | |
1514 | hidnplayr | 21 | MAX_FRAGMENTS equ 64 |
1159 | hidnplayr | 22 | MAX_IP equ MAX_NET_DEVICES |
1514 | hidnplayr | 23 | IP_MAX_INTERFACES equ MAX_IP |
1159 | hidnplayr | 24 | |
25 | struct IPv4_Packet |
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26 | .VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits] |
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1514 | hidnplayr | 27 | .TypeOfService db ? ; precedence [7-5] minimize delay [4], maximize throughput [3], maximize riliability [2] minimize momentary cost [1] and zero [0] |
1159 | hidnplayr | 28 | .TotalLength dw ? |
29 | .Identification dw ? |
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30 | .FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15] |
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31 | .TimeToLive db ? ; |
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32 | .Protocol db ? |
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33 | .HeaderChecksum dw ? |
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34 | .SourceAddress dd ? |
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35 | .DestinationAddress dd ? |
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36 | .DataOrOptional: |
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37 | ends |
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38 | |||
39 | struct FRAGMENT_slot |
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40 | .ttl dw ? ; Time to live for this entry, 0 for empty slot's |
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41 | .id dw ? ; Identification field from IP header |
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42 | .SrcIP dd ? ; .. from IP header |
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43 | .DstIP dd ? ; .. from IP header |
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44 | .ptr dd ? ; Pointer to first packet |
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45 | .size: |
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46 | ends |
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47 | |||
48 | struct FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets |
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49 | .PrevPtr dd ? ; Pointer to previous fragment entry (-1 for first packet) |
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50 | .NextPtr dd ? ; Pointer to next fragment entry (-1 for last packet) |
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51 | .Owner dd ? ; Pointer to structure of driver |
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1249 | hidnplayr | 52 | rb 2 ; to match ethernet header size ; TODO: fix this hack |
1159 | hidnplayr | 53 | .Data: ; Ip header begins here (we will need the IP header to re-construct the complete packet) |
54 | ends |
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55 | |||
1529 | hidnplayr | 56 | |
1530 | hidnplayr | 57 | align 4 |
58 | uglobal |
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1529 | hidnplayr | 59 | |
1530 | hidnplayr | 60 | IP_LIST rd MAX_IP |
61 | SUBNET_LIST rd MAX_IP |
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62 | DNS_LIST rd MAX_IP |
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63 | GATEWAY_LIST rd MAX_IP |
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1529 | hidnplayr | 64 | |
1530 | hidnplayr | 65 | IP_PACKETS_TX rd MAX_IP |
66 | IP_PACKETS_RX rd MAX_IP |
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67 | |||
68 | FRAGMENT_LIST rb MAX_FRAGMENTS*FRAGMENT_slot.size |
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69 | endg |
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70 | |||
71 | |||
72 | ;----------------------------------------------------------------- |
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73 | ; |
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74 | ; IPv4_init |
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75 | ; |
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76 | ; This function resets all IP variables |
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77 | ; |
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78 | ;----------------------------------------------------------------- |
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79 | macro IPv4_init { |
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80 | |||
81 | xor eax, eax |
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82 | mov edi, IP_LIST |
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83 | mov ecx, 4*MAX_IP |
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84 | rep stosd |
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85 | |||
86 | mov edi, FRAGMENT_LIST |
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87 | mov ecx, FRAGMENT_slot.size*MAX_FRAGMENTS/4 + 2*MAX_IP |
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88 | rep stosd |
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89 | |||
90 | } |
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91 | |||
92 | |||
93 | ;----------------------------------------------------------------- |
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94 | ; |
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95 | ; Decrease TimeToLive of all fragment slots |
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96 | ; |
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97 | ;----------------------------------------------------------------- |
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98 | macro IPv4_decrease_fragment_ttls { |
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99 | |||
100 | local .loop |
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101 | |||
102 | mov esi, FRAGMENT_LIST |
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103 | mov ecx, MAX_FRAGMENTS |
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104 | .loop: |
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105 | cmp [esi + FRAGMENT_slot.ttl], 0 |
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106 | je .try_next |
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107 | dec [esi + FRAGMENT_slot.ttl] |
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108 | jnz .try_next |
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109 | DEBUGF 1,"Fragment slot timed-out!\n" |
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110 | ;;; TODO: clear all entry's of timed-out slot |
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111 | .try_next: |
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112 | add esi, 4 |
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113 | loop .loop |
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114 | } |
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115 | |||
116 | |||
117 | |||
1529 | hidnplayr | 118 | macro IPv4_checksum ptr { |
119 | |||
120 | ; This is the fast procedure to create or check a IP header without options |
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121 | ; To create a new checksum, the checksum field must be set to 0 before computation |
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122 | ; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct |
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123 | |||
124 | push ebx |
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125 | xor ebx, ebx |
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126 | add bl, [ptr+1] |
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127 | adc bh, [ptr+0] |
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128 | |||
129 | adc bl, [ptr+3] |
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130 | adc bh, [ptr+2] |
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131 | |||
132 | adc bl, [ptr+5] |
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133 | adc bh, [ptr+4] |
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134 | |||
135 | adc bl, [ptr+7] |
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136 | adc bh, [ptr+6] |
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137 | |||
138 | adc bl, [ptr+9] |
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139 | adc bh, [ptr+8] |
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140 | |||
141 | ; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation |
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142 | |||
143 | adc bl, [ptr+13] |
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144 | adc bh, [ptr+12] |
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145 | |||
146 | adc bl, [ptr+15] |
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147 | adc bh, [ptr+14] |
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148 | |||
149 | adc bl, [ptr+17] |
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150 | adc bh, [ptr+16] |
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151 | |||
152 | adc bl, [ptr+19] |
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153 | adc bh, [ptr+18] |
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154 | |||
155 | adc ebx, 0 |
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156 | |||
157 | push ecx |
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158 | mov ecx, ebx |
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159 | shr ecx, 16 |
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160 | and ebx, 0xffff |
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161 | add ebx, ecx |
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162 | |||
163 | mov ecx, ebx |
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164 | shr ecx, 16 |
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165 | add ebx, ecx |
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166 | |||
167 | not bx |
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168 | jnz .not_zero |
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169 | dec bx |
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170 | .not_zero: |
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171 | xchg bl, bh |
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172 | pop ecx |
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173 | |||
174 | neg word [ptr+10] ; zero will stay zero so we just get the checksum |
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175 | add word [ptr+10], bx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :) |
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176 | pop ebx |
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177 | |||
178 | } |
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179 | |||
180 | |||
181 | |||
1159 | hidnplayr | 182 | ;----------------------------------------------------------------- |
183 | ; |
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1529 | hidnplayr | 184 | ; IPv4_input: |
1159 | hidnplayr | 185 | ; |
1249 | hidnplayr | 186 | ; Will check if IP Packet isnt damaged |
1159 | hidnplayr | 187 | ; and call appropriate handler. (TCP/UDP/ICMP/..) |
188 | ; |
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189 | ; It will also re-construct fragmented packets |
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190 | ; |
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191 | ; IN: Pointer to buffer in [esp] |
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192 | ; size of buffer in [esp+4] |
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193 | ; pointer to device struct in ebx |
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194 | ; pointer to IP Packet data in edx |
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195 | ; OUT: / |
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196 | ; |
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197 | ;----------------------------------------------------------------- |
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198 | align 4 |
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1529 | hidnplayr | 199 | IPv4_input: ; TODO: implement handler for IP options |
1514 | hidnplayr | 200 | ; TODO2: add code for raw sockets |
1159 | hidnplayr | 201 | |
1514 | hidnplayr | 202 | DEBUGF 1,"IPv4_Handler, packet from: %u.%u.%u.%u ",\ |
203 | [edx + IPv4_Packet.SourceAddress]:1,[edx + IPv4_Packet.SourceAddress + 1]:1,[edx + IPv4_Packet.SourceAddress + 2]:1,[edx + IPv4_Packet.SourceAddress + 3]:1 |
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204 | DEBUGF 1,"to: %u.%u.%u.%u\n",\ |
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205 | [edx + IPv4_Packet.DestinationAddress]:1,[edx + IPv4_Packet.DestinationAddress + 1]:1,[edx + IPv4_Packet.DestinationAddress + 2]:1,[edx + IPv4_Packet.DestinationAddress + 3]:1 |
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1159 | hidnplayr | 206 | |
1473 | hidnplayr | 207 | ;------------------------------------------- |
208 | ; Check if the packet still has time to live |
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1159 | hidnplayr | 209 | |
1473 | hidnplayr | 210 | cmp byte [edx + IPv4_Packet.TimeToLive], 0 |
211 | je .dump |
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212 | |||
213 | ;-------------------------------------- |
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214 | ; First, check if IP packet has options |
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215 | |||
216 | movzx eax, [edx + IPv4_Packet.VersionAndIHL] |
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217 | and al , 0x0f ; get IHL(header length) |
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218 | cmp al , 0x05 ; IHL!= 5*4(20 bytes) |
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219 | jnz .has_options |
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220 | |||
221 | ;------------------------------- |
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1514 | hidnplayr | 222 | ; Now, re-calculate the checksum |
1473 | hidnplayr | 223 | |
1529 | hidnplayr | 224 | IPv4_checksum edx |
225 | jnz .dump ; if checksum isn't valid then dump packet |
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1249 | hidnplayr | 226 | |
1473 | hidnplayr | 227 | DEBUGF 1,"IPv4 Checksum is correct\n" |
1254 | hidnplayr | 228 | |
1514 | hidnplayr | 229 | ;----------------------------------- |
230 | ; Check if destination IP is correct |
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1473 | hidnplayr | 231 | |
1514 | hidnplayr | 232 | call NET_ptr_to_num |
233 | shl edi, 2 |
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1473 | hidnplayr | 234 | |
1514 | hidnplayr | 235 | ; check if it matches local ip |
1473 | hidnplayr | 236 | |
1514 | hidnplayr | 237 | mov eax, dword[IP_LIST+edi] |
238 | cmp [edx + IPv4_Packet.DestinationAddress], eax |
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239 | je .ip_ok |
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1159 | hidnplayr | 240 | |
1514 | hidnplayr | 241 | ; check for broadcast |
242 | |||
243 | mov eax, dword[SUBNET_LIST+edi] |
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1159 | hidnplayr | 244 | not eax |
1514 | hidnplayr | 245 | or eax, dword[IP_LIST+edi] |
246 | cmp [edx + IPv4_Packet.DestinationAddress], eax |
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247 | je .ip_ok |
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1159 | hidnplayr | 248 | |
1514 | hidnplayr | 249 | ; or a special broadcast |
1159 | hidnplayr | 250 | |
1514 | hidnplayr | 251 | cmp [edx + IPv4_Packet.DestinationAddress], -1 |
252 | je .ip_ok |
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1473 | hidnplayr | 253 | |
1519 | hidnplayr | 254 | ; maybe it's a multicast then |
255 | |||
256 | mov eax, [edx + IPv4_Packet.DestinationAddress] |
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257 | and eax, 0xff000000 |
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1514 | hidnplayr | 258 | ; cmp eax, 224 shl 24 |
259 | ; je .ip_ok |
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1159 | hidnplayr | 260 | |
1514 | hidnplayr | 261 | ; or a loopback address |
1473 | hidnplayr | 262 | |
1514 | hidnplayr | 263 | cmp eax, 127 shl 24 |
264 | je .ip_ok |
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1473 | hidnplayr | 265 | |
1514 | hidnplayr | 266 | ; or it's not meant for us.. |
1159 | hidnplayr | 267 | |
1514 | hidnplayr | 268 | DEBUGF 2,"Destination address does not match!\n" |
269 | jmp .dump |
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1159 | hidnplayr | 270 | |
1514 | hidnplayr | 271 | ;------------------------ |
272 | ; Now we can update stats |
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1159 | hidnplayr | 273 | |
1514 | hidnplayr | 274 | .ip_ok: |
275 | inc [IP_PACKETS_RX+edi] |
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1159 | hidnplayr | 276 | |
1473 | hidnplayr | 277 | ;---------------------------------- |
278 | ; Check if the packet is fragmented |
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1159 | hidnplayr | 279 | |
1473 | hidnplayr | 280 | test [edx + IPv4_Packet.FlagsAndFragmentOffset], 1 shl 5 ; Is 'more fragments' flag set ? |
281 | jnz .has_fragments ; If so, we definately have a fragmented packet |
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1159 | hidnplayr | 282 | |
1473 | hidnplayr | 283 | test [edx + IPv4_Packet.FlagsAndFragmentOffset], 0xff1f ; If flag is not set, but there is a fragment offset, the packet is last in series of fragmented packets |
284 | jnz .is_last_fragment |
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285 | |||
286 | ;------------------------------------------------------------------- |
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287 | ; No, it's just a regular IP packet, pass it to the higher protocols |
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288 | |||
289 | .handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed |
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1159 | hidnplayr | 290 | movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field |
1514 | hidnplayr | 291 | and eax, 0x0000000f ; |
1159 | hidnplayr | 292 | shl eax, 2 ; |
293 | movzx ecx, word [edx + IPv4_Packet.TotalLength] ; Calculate length of encapsulated Packet |
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294 | xchg cl , ch ; |
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295 | sub ecx, eax ; |
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296 | |||
297 | add eax, edx |
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298 | push eax |
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1473 | hidnplayr | 299 | |
300 | mov esi, [edx + IPv4_Packet.SourceAddress] ; These values might be of interest to the higher protocols |
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301 | mov edi, [edx + IPv4_Packet.DestinationAddress] ; |
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1159 | hidnplayr | 302 | mov al , [edx + IPv4_Packet.Protocol] |
303 | pop edx ; Offset to data (tcp/udp/icmp/.. Packet) |
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304 | |||
305 | cmp al , IP_PROTO_TCP |
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1514 | hidnplayr | 306 | je TCP_input |
1159 | hidnplayr | 307 | |
308 | cmp al , IP_PROTO_UDP |
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1514 | hidnplayr | 309 | je UDP_input |
1159 | hidnplayr | 310 | |
311 | cmp al , IP_PROTO_ICMP |
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1514 | hidnplayr | 312 | je ICMP_input |
1159 | hidnplayr | 313 | |
1473 | hidnplayr | 314 | DEBUGF 2,"unknown Internet protocol: %u\n", al |
1159 | hidnplayr | 315 | |
316 | .dump: |
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1473 | hidnplayr | 317 | DEBUGF 2,"IP_Handler - dumping\n" |
1159 | hidnplayr | 318 | ; inc [dumped_rx_count] |
319 | call kernel_free |
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320 | add esp, 4 ; pop (balance stack) |
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321 | ret |
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322 | |||
323 | |||
1473 | hidnplayr | 324 | ;--------------------------- |
325 | ; Fragmented packet handler |
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326 | |||
327 | |||
328 | .has_fragments: |
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329 | movzx eax, [edx + IPv4_Packet.FlagsAndFragmentOffset] |
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330 | xchg al , ah |
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1159 | hidnplayr | 331 | shl ax , 3 |
1473 | hidnplayr | 332 | |
1159 | hidnplayr | 333 | DEBUGF 1,"Fragmented packet, offset:%u, id:%x\n", ax, [edx + IPv4_Packet.Identification]:4 |
334 | |||
335 | test ax , ax ; Is this the first packet of the fragment? |
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1473 | hidnplayr | 336 | jz .is_first_fragment |
1159 | hidnplayr | 337 | |
1473 | hidnplayr | 338 | |
339 | ;------------------------------------------------------- |
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340 | ; We have a fragmented IP packet, but it's not the first |
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341 | |||
342 | DEBUGF 1,"Middle fragmented packet received!\n" |
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343 | |||
344 | call IPv4_find_fragment_slot |
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345 | cmp esi, -1 |
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346 | je .dump |
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347 | |||
348 | mov word [esi + FRAGMENT_slot.ttl], 15 ; Reset the ttl |
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349 | mov esi, [esi + FRAGMENT_slot.ptr] |
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350 | or edi, -1 |
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351 | .find_last_entry: ; The following routine will try to find the last entry |
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352 | cmp edi, [esi + FRAGMENT_entry.PrevPtr] |
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353 | jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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354 | mov edi, esi |
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355 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
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356 | cmp esi, -1 |
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357 | jne .find_last_entry |
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358 | ; We found the last entry (pointer is now in edi) |
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359 | ; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure |
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360 | |||
361 | pop eax ; pointer to packet |
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362 | mov [edi + FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry |
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363 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
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364 | mov [eax + FRAGMENT_entry.PrevPtr], edi |
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365 | mov [eax + FRAGMENT_entry.Owner], ebx |
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366 | |||
367 | add esp, 4 |
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368 | ret |
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369 | |||
370 | |||
371 | ;------------------------------------ |
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372 | ; We have received the first fragment |
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373 | |||
374 | .is_first_fragment: |
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1159 | hidnplayr | 375 | DEBUGF 1,"First fragmented packet received!\n" |
376 | ; try to locate a free slot.. |
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377 | mov ecx, MAX_FRAGMENTS |
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378 | mov esi, FRAGMENT_LIST |
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1473 | hidnplayr | 379 | .find_free_slot: |
1159 | hidnplayr | 380 | cmp word [esi + FRAGMENT_slot.ttl], 0 |
381 | je .found_free_slot |
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382 | add esi, FRAGMENT_slot.size |
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383 | loop .find_free_slot |
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384 | jmp .dump ; If no free slot was found, dump the packet |
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385 | |||
1473 | hidnplayr | 386 | .found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure |
1159 | hidnplayr | 387 | mov word [esi + FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl |
388 | mov ax , word [edx + IPv4_Packet.Identification] |
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389 | mov word [esi + FRAGMENT_slot.id], ax |
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390 | mov eax, dword [edx + IPv4_Packet.SourceAddress] |
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391 | mov dword [esi + FRAGMENT_slot.SrcIP], eax |
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392 | mov eax, dword [edx + IPv4_Packet.DestinationAddress] |
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393 | mov dword [esi + FRAGMENT_slot.DstIP], eax |
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394 | pop eax |
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395 | mov dword [esi + FRAGMENT_slot.ptr], eax |
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396 | ; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure |
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397 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
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398 | mov [eax + FRAGMENT_entry.PrevPtr], -1 |
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399 | mov [eax + FRAGMENT_entry.Owner], ebx |
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400 | |||
401 | add esp, 4 ; balance stack and exit |
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402 | ret |
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403 | |||
404 | |||
1473 | hidnplayr | 405 | ;----------------------------------- |
406 | ; We have received the last fragment |
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1159 | hidnplayr | 407 | |
1473 | hidnplayr | 408 | .is_last_fragment: |
409 | DEBUGF 1,"Last fragmented packet received!\n" |
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1159 | hidnplayr | 410 | |
1473 | hidnplayr | 411 | call IPv4_find_fragment_slot |
1159 | hidnplayr | 412 | cmp esi, -1 |
413 | je .dump |
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414 | |||
415 | mov esi, [esi + FRAGMENT_slot.ptr] ; We found the first entry, let's calculate total size of the packet in eax, so we can allocate a buffer |
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416 | push esi |
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1473 | hidnplayr | 417 | xor eax, eax |
1159 | hidnplayr | 418 | or edi, -1 |
1473 | hidnplayr | 419 | |
420 | .count_bytes: |
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1159 | hidnplayr | 421 | cmp [esi + FRAGMENT_entry.PrevPtr], edi |
1473 | hidnplayr | 422 | jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
1159 | hidnplayr | 423 | mov cx, word [esi + FRAGMENT_entry.Data + IPv4_Packet.TotalLength] ; Add total length |
424 | xchg cl, ch |
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425 | DEBUGF 1,"Packet size: %u\n", cx |
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426 | add ax, cx |
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427 | movzx cx, byte [esi + FRAGMENT_entry.Data + IPv4_Packet.VersionAndIHL] ; Sub Header length |
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428 | and cx, 0x000F |
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429 | shl cx, 2 |
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430 | DEBUGF 1,"Header size: %u\n", cx |
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431 | sub ax, cx |
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432 | mov edi, esi |
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433 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
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434 | cmp esi, -1 |
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435 | jne .count_bytes |
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436 | |||
1514 | hidnplayr | 437 | mov esi, [esp+4] |
1159 | hidnplayr | 438 | mov [edi + FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code |
439 | mov [esi + FRAGMENT_entry.NextPtr], -1 |
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440 | mov [esi + FRAGMENT_entry.PrevPtr], edi |
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441 | mov [esi + FRAGMENT_entry.Owner], ebx |
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442 | |||
443 | mov cx, [edx + IPv4_Packet.TotalLength] ; Note: This time we dont substract Header length |
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444 | xchg cl , ch |
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445 | DEBUGF 1,"Packet size: %u\n", cx |
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446 | add ax , cx |
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447 | DEBUGF 1,"Total Received data size: %u\n", eax |
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448 | |||
449 | push eax |
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450 | mov ax , [edx + IPv4_Packet.FlagsAndFragmentOffset] |
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451 | xchg al , ah |
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452 | shl ax , 3 |
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453 | add cx , ax |
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454 | pop eax |
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455 | DEBUGF 1,"Total Fragment size: %u\n", ecx |
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456 | |||
457 | cmp ax, cx |
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458 | jne .destroy_slot_pop |
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459 | |||
460 | push eax |
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461 | push eax |
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462 | call kernel_alloc |
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463 | test eax, eax |
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464 | je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot |
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465 | mov edx, [esp+4] ; Get pointer to first fragment entry back in edx |
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466 | |||
1473 | hidnplayr | 467 | .rebuild_packet_loop: |
1159 | hidnplayr | 468 | movzx ecx, word [edx + FRAGMENT_entry.Data + IPv4_Packet.FlagsAndFragmentOffset] ; Calculate the fragment offset |
1473 | hidnplayr | 469 | xchg cl , ch ; intel byte order |
1159 | hidnplayr | 470 | shl cx , 3 ; multiply by 8 and clear first 3 bits |
471 | DEBUGF 1,"Fragment offset: %u\n", cx |
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472 | |||
473 | lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment |
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474 | movzx ebx, byte [edx + FRAGMENT_entry.Data + IPv4_Packet.VersionAndIHL] ; Find header size (in ebx) of fragment |
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475 | and bx , 0x000F ; |
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476 | shl bx , 2 ; |
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477 | |||
478 | lea esi, [edx + FRAGMENT_entry.Data] ; Set esi to the correct begin of fragment |
||
479 | movzx ecx, word [edx + FRAGMENT_entry.Data + IPv4_Packet.TotalLength] ; Calculate total length of fragment |
||
480 | xchg cl, ch ; intel byte order |
||
481 | |||
482 | cmp edi, eax ; Is this packet the first fragment ? |
||
483 | je .first_fragment |
||
484 | sub cx, bx ; If not, dont copy the header |
||
485 | add esi, ebx ; |
||
1473 | hidnplayr | 486 | .first_fragment: |
1159 | hidnplayr | 487 | |
488 | push cx ; First copy dword-wise, then byte-wise |
||
489 | shr cx, 2 ; |
||
490 | rep movsd ; |
||
491 | pop cx ; |
||
492 | and cx, 3 ; |
||
493 | rep movsb ; |
||
494 | |||
495 | push eax |
||
496 | push edx ; Push pointer to fragment onto stack |
||
1473 | hidnplayr | 497 | mov ebx, [edx + FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet |
1159 | hidnplayr | 498 | mov edx, [edx + FRAGMENT_entry.NextPtr] ; Set edx to the next pointer |
499 | call kernel_free ; free the previous fragment buffer (this uses the value from stack) |
||
500 | pop eax |
||
501 | cmp edx, -1 ; Check if it is last fragment in chain |
||
502 | jne .rebuild_packet_loop |
||
503 | |||
504 | pop ecx ; |
||
505 | xchg cl, ch |
||
506 | mov edx, eax |
||
507 | mov word [edx + IPv4_Packet.TotalLength], cx |
||
508 | add esp, 8 |
||
509 | |||
1473 | hidnplayr | 510 | xchg cl, ch ; |
511 | |||
512 | push ecx ;;;; |
||
513 | push eax ;;;; |
||
514 | |||
515 | ; mov esi, edx ; This prints the IP packet to the debug board (usefull when using serial output debug..) |
||
1159 | hidnplayr | 516 | ; ; |
1529 | hidnplayr | 517 | ; packet_to_debug |
1159 | hidnplayr | 518 | |
1473 | hidnplayr | 519 | jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr |
1249 | hidnplayr | 520 | |
1473 | hidnplayr | 521 | .destroy_slot_pop: |
522 | add esp, 4 |
||
523 | .destroy_slot: |
||
524 | DEBUGF 1,"Destroy fragment slot!\n" |
||
525 | ; TODO! |
||
526 | jmp .dump |
||
1249 | hidnplayr | 527 | |
528 | |||
1159 | hidnplayr | 529 | |
530 | |||
1473 | hidnplayr | 531 | ;----------------------------------- |
532 | ; The IP packet has some options |
||
1159 | hidnplayr | 533 | |
1473 | hidnplayr | 534 | .has_options: |
535 | jmp .dump |
||
1159 | hidnplayr | 536 | |
537 | |||
1166 | hidnplayr | 538 | |
1159 | hidnplayr | 539 | ;----------------------------------------------------------------- |
540 | ; |
||
541 | ; find fragment slot |
||
542 | ; |
||
1514 | hidnplayr | 543 | ; IN: pointer to fragmented packet in edx |
1159 | hidnplayr | 544 | ; OUT: pointer to slot in edi, -1 on error |
545 | ; |
||
546 | ;----------------------------------------------------------------- |
||
1473 | hidnplayr | 547 | align 4 |
548 | IPv4_find_fragment_slot: |
||
1159 | hidnplayr | 549 | |
1514 | hidnplayr | 550 | ;;; TODO: the RFC says we should check protocol number too |
551 | |||
1159 | hidnplayr | 552 | push eax ebx ecx edx |
553 | mov ax , word [edx + IPv4_Packet.Identification] |
||
554 | mov ecx, MAX_FRAGMENTS |
||
555 | mov esi, FRAGMENT_LIST |
||
556 | mov ebx, dword [edx + IPv4_Packet.SourceAddress] |
||
557 | mov edx, dword [edx + IPv4_Packet.DestinationAddress] |
||
558 | .find_slot: |
||
559 | cmp word [esi + FRAGMENT_slot.id], ax |
||
560 | jne .try_next |
||
561 | cmp dword [esi + FRAGMENT_slot.SrcIP], ebx |
||
562 | jne .try_next |
||
563 | cmp dword [esi + FRAGMENT_slot.DstIP], edx |
||
564 | je .found_slot |
||
565 | .try_next: |
||
566 | add esi, FRAGMENT_slot.size |
||
567 | loop .find_slot |
||
1473 | hidnplayr | 568 | ; pop edx ebx |
1159 | hidnplayr | 569 | or esi, -1 |
570 | ; ret |
||
571 | |||
572 | .found_slot: |
||
573 | pop edx ecx ebx eax |
||
574 | ret |
||
575 | |||
576 | |||
1514 | hidnplayr | 577 | ;------------------------------------------------------------------ |
1159 | hidnplayr | 578 | ; |
1529 | hidnplayr | 579 | ; IPv4_output |
1514 | hidnplayr | 580 | ; |
1159 | hidnplayr | 581 | ; IN: eax = dest ip |
582 | ; ebx = source ip |
||
583 | ; ecx = data length |
||
1529 | hidnplayr | 584 | ; dx = fragment id |
585 | ; di = TTL shl 8 + protocol |
||
1159 | hidnplayr | 586 | ; |
1249 | hidnplayr | 587 | ; OUT: eax = pointer to buffer start |
588 | ; ebx = pointer to device struct (needed for sending procedure) |
||
1159 | hidnplayr | 589 | ; ecx = unchanged (packet size of embedded data) |
1249 | hidnplayr | 590 | ; edx = size of complete buffer |
1514 | hidnplayr | 591 | ; edi = pointer to start of data (0 on error) |
1159 | hidnplayr | 592 | ; |
1514 | hidnplayr | 593 | ;------------------------------------------------------------------ |
1159 | hidnplayr | 594 | align 4 |
1529 | hidnplayr | 595 | IPv4_output: |
1159 | hidnplayr | 596 | |
1529 | hidnplayr | 597 | DEBUGF 1,"IPv4_create_packet: size=%u\n", ecx |
1159 | hidnplayr | 598 | |
1529 | hidnplayr | 599 | cmp ecx, 65500 ; Max IPv4 packet size |
600 | jg .too_large |
||
1159 | hidnplayr | 601 | |
1206 | hidnplayr | 602 | push ecx eax ebx dx di |
603 | |||
1196 | hidnplayr | 604 | call ARP_IP_to_MAC |
1159 | hidnplayr | 605 | |
1529 | hidnplayr | 606 | test eax, 0xffff0000 ; error bits |
607 | jnz .arp_error |
||
1196 | hidnplayr | 608 | |
1530 | hidnplayr | 609 | .continue: |
610 | |||
1529 | hidnplayr | 611 | push ebx ; push the mac |
1196 | hidnplayr | 612 | push ax |
613 | |||
1159 | hidnplayr | 614 | call IPv4_dest_to_dev |
1529 | hidnplayr | 615 | inc [IP_PACKETS_TX+edi] |
616 | mov ebx, [NET_DRV_LIST+edi] |
||
617 | lea eax, [ebx + ETH_DEVICE.mac] |
||
618 | mov edx, esp |
||
619 | mov ecx, [esp + 18] |
||
1159 | hidnplayr | 620 | add ecx, IPv4_Packet.DataOrOptional |
621 | mov di , ETHER_IPv4 |
||
1529 | hidnplayr | 622 | call ETH_output |
623 | jz .error |
||
1159 | hidnplayr | 624 | |
1529 | hidnplayr | 625 | add esp, 6 ; pop the mac |
626 | |||
627 | mov [edi + IPv4_Packet.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header) |
||
628 | mov [edi + IPv4_Packet.TypeOfService], 0 ; nothing special, just plain ip packet |
||
1159 | hidnplayr | 629 | mov [edi + IPv4_Packet.TotalLength], cx |
1529 | hidnplayr | 630 | rol [edi + IPv4_Packet.TotalLength], 8 ; internet byte order |
1159 | hidnplayr | 631 | mov [edi + IPv4_Packet.FlagsAndFragmentOffset], 0x0000 |
632 | mov [edi + IPv4_Packet.HeaderChecksum], 0 |
||
1529 | hidnplayr | 633 | popw word [edi + IPv4_Packet.TimeToLive] ; ttl shl 8 + protocol |
634 | ; [edi + IPv4_Packet.Protocol] |
||
635 | popw [edi + IPv4_Packet.Identification] ; fragment id |
||
636 | popd [edi + IPv4_Packet.SourceAddress] |
||
637 | popd [edi + IPv4_Packet.DestinationAddress] |
||
638 | |||
1159 | hidnplayr | 639 | pop ecx |
640 | |||
1529 | hidnplayr | 641 | IPv4_checksum edi |
1159 | hidnplayr | 642 | add edi, IPv4_Packet.DataOrOptional |
1514 | hidnplayr | 643 | DEBUGF 1,"IPv4 Packet for device %x created successfully\n", ebx |
1159 | hidnplayr | 644 | ret |
645 | |||
1529 | hidnplayr | 646 | .error: |
647 | add esp, 6 |
||
648 | .arp_error: |
||
649 | add esp, 4+4+4+2+2 |
||
650 | .too_large: |
||
651 | DEBUGF 1,"IPv4_create_packet: Failed\n" |
||
652 | sub edi, edi |
||
1159 | hidnplayr | 653 | ret |
654 | |||
655 | |||
1541 | hidnplayr | 656 | |
657 | |||
658 | |||
659 | ;------------------------------------------------------------------ |
||
660 | ; |
||
661 | ; IPv4_output_raw |
||
662 | ; |
||
663 | ; IN: eax = socket ptr |
||
664 | ; ecx = data length |
||
665 | ; esi = data ptr |
||
666 | ; |
||
667 | ; OUT: / |
||
668 | ; |
||
669 | ;------------------------------------------------------------------ |
||
670 | align 4 |
||
671 | IPv4_output_raw: |
||
672 | |||
673 | DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax |
||
674 | |||
675 | cmp ecx, 1480 ;;;;; |
||
676 | jg .too_large |
||
677 | |||
678 | sub esp, 8 |
||
679 | push esi eax |
||
680 | |||
681 | call ARP_IP_to_MAC |
||
682 | |||
683 | test eax, 0xffff0000 ; error bits |
||
684 | jnz .arp_error |
||
685 | |||
686 | .continue: |
||
687 | |||
688 | push ebx ; push the mac |
||
689 | push ax |
||
690 | |||
691 | call IPv4_dest_to_dev |
||
692 | inc [IP_PACKETS_TX+edi] |
||
693 | mov ebx, [NET_DRV_LIST+edi] |
||
694 | lea eax, [ebx + ETH_DEVICE.mac] |
||
695 | mov edx, esp |
||
696 | mov ecx, [esp + 6+4] |
||
697 | add ecx, IPv4_Packet.DataOrOptional |
||
698 | mov di, ETHER_IPv4 |
||
699 | call ETH_output |
||
700 | jz .error |
||
701 | |||
702 | add esp, 6 ; pop the mac |
||
703 | |||
704 | mov dword[esp+4+4], edx |
||
705 | mov dword[esp+4+4+4], eax |
||
706 | |||
707 | pop eax esi |
||
708 | ;; todo: check socket options if we should add header, or just compute checksum |
||
709 | |||
710 | push edi ecx |
||
711 | rep movsb |
||
712 | pop ecx edi |
||
713 | |||
714 | ; [edi + IPv4_Packet.VersionAndIHL] ; IPv4, normal length (no Optional header) |
||
715 | ; [edi + IPv4_Packet.TypeOfService] ; nothing special, just plain ip packet |
||
716 | ; [edi + IPv4_Packet.TotalLength] |
||
717 | ; [edi + IPv4_Packet.TotalLength] ; internet byte order |
||
718 | ; [edi + IPv4_Packet.FlagsAndFragmentOffset] |
||
719 | |||
720 | mov [edi + IPv4_Packet.HeaderChecksum], 0 |
||
721 | |||
722 | ; [edi + IPv4_Packet.TimeToLive] ; ttl shl 8 + protocol |
||
723 | ; [edi + IPv4_Packet.Protocol] |
||
724 | ; [edi + IPv4_Packet.Identification] ; fragment id |
||
725 | ; [edi + IPv4_Packet.SourceAddress] |
||
726 | ; [edi + IPv4_Packet.DestinationAddress] |
||
727 | |||
728 | IPv4_checksum edi ;;;; todo: checksum for IP packet with options! |
||
729 | add edi, IPv4_Packet.DataOrOptional |
||
730 | DEBUGF 1,"IPv4 Packet for device %x created successfully\n", ebx |
||
731 | call [ebx + NET_DEVICE.transmit] |
||
732 | ret |
||
733 | |||
734 | .error: |
||
735 | add esp, 6 |
||
736 | .arp_error: |
||
737 | add esp, 8+4+4 |
||
738 | .too_large: |
||
739 | DEBUGF 1,"IPv4_output_raw: Failed\n" |
||
740 | sub edi, edi |
||
741 | ret |
||
742 | |||
743 | |||
1529 | hidnplayr | 744 | ;-------------------------------------------------------- |
745 | ; |
||
746 | ; |
||
747 | ; IN: dword [esp] = pointer to buffer containing ipv4 packet to be fragmented |
||
748 | ; dword [esp+4] = buffer size |
||
749 | ; esi = pointer to ip header in that buffer |
||
750 | ; ecx = max size of fragments |
||
751 | ; |
||
752 | ; OUT: / |
||
753 | ; |
||
754 | ;-------------------------------------------------------- |
||
1159 | hidnplayr | 755 | |
1482 | hidnplayr | 756 | align 4 |
1529 | hidnplayr | 757 | IPv4_fragment: |
1206 | hidnplayr | 758 | |
1529 | hidnplayr | 759 | DEBUGF 1,"IPv4_fragment\n" |
1482 | hidnplayr | 760 | |
1529 | hidnplayr | 761 | and ecx, not 111b ; align 4 |
1482 | hidnplayr | 762 | |
1529 | hidnplayr | 763 | cmp ecx, IPv4_Packet.DataOrOptional + 8 ; must be able to put at least 8 bytes |
764 | jl .err2 |
||
1482 | hidnplayr | 765 | |
1529 | hidnplayr | 766 | push esi ecx |
767 | mov eax, [esi + IPv4_Packet.DestinationAddress] |
||
768 | call ARP_IP_to_MAC |
||
769 | pop ecx esi |
||
770 | cmp eax, -1 |
||
771 | jz .err2 |
||
1482 | hidnplayr | 772 | |
1529 | hidnplayr | 773 | push ebx |
774 | push ax |
||
1482 | hidnplayr | 775 | |
1529 | hidnplayr | 776 | mov ebx, [NET_DRV_LIST] |
777 | lea eax, [ebx + ETH_DEVICE.mac] |
||
778 | push eax |
||
1482 | hidnplayr | 779 | |
780 | |||
1529 | hidnplayr | 781 | push esi ; ptr to ip header |
782 | sub ecx, 20 ; substract header size |
||
783 | push ecx ; max data size |
||
784 | push dword 0 ; offset |
||
1482 | hidnplayr | 785 | |
1529 | hidnplayr | 786 | .new_fragment: |
787 | DEBUGF 1,"Ipv4_fragment - new_fragmentn" |
||
1482 | hidnplayr | 788 | |
789 | |||
1529 | hidnplayr | 790 | mov eax, [esp + 3*4] |
791 | lea ebx, [esp + 4*4] |
||
792 | mov di , ETHER_IPv4 |
||
793 | call ETH_output |
||
1482 | hidnplayr | 794 | |
1529 | hidnplayr | 795 | cmp edi, -1 |
796 | jz .err |
||
1482 | hidnplayr | 797 | |
1529 | hidnplayr | 798 | ; copy header |
799 | mov esi, [esp + 2*4] |
||
800 | mov ecx, 5 ; 5 dwords: TODO: use IHL field of the header! |
||
801 | rep movsd |
||
1482 | hidnplayr | 802 | |
1529 | hidnplayr | 803 | ; copy data |
804 | mov esi, [esp + 2*4] |
||
805 | add esi, 20 |
||
806 | add esi, [esp] ; offset |
||
1482 | hidnplayr | 807 | |
1529 | hidnplayr | 808 | mov ecx, [esp + 1*4] |
809 | DEBUGF 1,"IPv4_fragment - copying data (%u bytes)\n", ecx |
||
810 | rep movsb |
||
1482 | hidnplayr | 811 | |
1529 | hidnplayr | 812 | ; now, correct header |
813 | mov ecx, [esp + 1*4] |
||
814 | add ecx, 20 |
||
815 | xchg cl, ch |
||
816 | mov [edi + IPv4_Packet.TotalLength], cx |
||
1482 | hidnplayr | 817 | |
1529 | hidnplayr | 818 | mov ecx, [esp] ; offset |
819 | xchg cl, ch |
||
1482 | hidnplayr | 820 | |
1529 | hidnplayr | 821 | ; cmp dword[esp + 4*4], 0 ; last fragment?;<<<<<< |
822 | ; je .last_fragment |
||
823 | or cx, 1 shl 2 ; more fragments |
||
824 | ; .last_fragment: |
||
825 | mov [edi + IPv4_Packet.FlagsAndFragmentOffset], cx |
||
1482 | hidnplayr | 826 | |
1529 | hidnplayr | 827 | mov [edi + IPv4_Packet.HeaderChecksum], 0 |
1482 | hidnplayr | 828 | |
1529 | hidnplayr | 829 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< send the packet |
830 | mov ecx, [esp + 1*4] |
||
1482 | hidnplayr | 831 | |
1529 | hidnplayr | 832 | push edx eax |
833 | IPv4_checksum edi |
||
834 | |||
835 | call [ebx + NET_DEVICE.transmit] |
||
836 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
||
837 | |||
838 | mov ecx, [esp+4] |
||
839 | add [esp], ecx |
||
840 | |||
841 | mov ecx, [esp+3*4+6+4] ; ptr to begin of buff |
||
842 | add ecx, [esp+3*4+6+4+4] ; buff size |
||
843 | sub ecx, [esp+2*4] ; ptr to ip header |
||
844 | add ecx, [esp] ; offset |
||
845 | |||
846 | DEBUGF 1,"Ipv4_fragment - bytes remaining: %u\n", ecx |
||
847 | |||
848 | cmp ecx, [esp+1*4] |
||
849 | jge .new_fragment |
||
850 | |||
851 | mov [esp+4], ecx ; set fragment size to remaining packet size |
||
852 | jmp .new_fragment |
||
853 | |||
854 | .err: |
||
855 | DEBUGF 1,"Ipv4_fragment - failed\n" |
||
856 | .done: |
||
857 | add esp, 12 + 4 + 6 |
||
858 | .err2: |
||
859 | DEBUGF 1,"Ipv4_fragment - dumping\n" |
||
860 | call kernel_free |
||
861 | add esp, 4 |
||
862 | |||
863 | ret |
||
864 | |||
865 | |||
866 | |||
1159 | hidnplayr | 867 | ;--------------------------------------------------------------------------- |
868 | ; |
||
869 | ; IPv4_dest_to_dev |
||
870 | ; |
||
1529 | hidnplayr | 871 | ; IN: eax = Destination IP |
872 | ; OUT: edi = device id * 4 |
||
1159 | hidnplayr | 873 | ; |
874 | ;--------------------------------------------------------------------------- |
||
875 | align 4 |
||
876 | IPv4_dest_to_dev: |
||
877 | |||
1529 | hidnplayr | 878 | cmp eax, 0xffffffff |
879 | je .invalid |
||
1159 | hidnplayr | 880 | |
881 | xor edi, edi |
||
882 | mov ecx, MAX_IP |
||
883 | |||
884 | .loop: |
||
1529 | hidnplayr | 885 | mov ebx, [IP_LIST+edi] |
886 | and ebx, [SUBNET_LIST+edi] |
||
887 | jz .next |
||
888 | |||
1159 | hidnplayr | 889 | mov edx, eax |
890 | and edx, [SUBNET_LIST+edi] |
||
891 | |||
892 | cmp ebx, edx |
||
893 | je .found_it |
||
1529 | hidnplayr | 894 | .next: |
1159 | hidnplayr | 895 | add edi, 4 |
896 | loop .loop |
||
897 | |||
1529 | hidnplayr | 898 | .invalid: |
899 | xor edi, edi ; if none found, use device 0 as default device |
||
1159 | hidnplayr | 900 | |
901 | .found_it: |
||
1529 | hidnplayr | 902 | DEBUGF 1,"IPv4_dest_to_dev: %u\n", edi |
1159 | hidnplayr | 903 | |
904 | ret |
||
905 | |||
906 | |||
907 | |||
908 | ;--------------------------------------------------------------------------- |
||
909 | ; |
||
910 | ; IPv4_get_frgmnt_num |
||
911 | ; |
||
912 | ; IN: / |
||
913 | ; OUT: fragment number in ax |
||
914 | ; |
||
915 | ;--------------------------------------------------------------------------- |
||
916 | align 4 |
||
917 | IPv4_get_frgmnt_num: |
||
918 | xor ax, ax ;;; TODO: replace this with real code |
||
919 | |||
920 | ret |
||
921 | |||
922 | |||
923 | ;--------------------------------------------------------------------------- |
||
924 | ; |
||
925 | ; IPv4_API |
||
926 | ; |
||
927 | ; This function is called by system function 75 |
||
928 | ; |
||
929 | ; IN: subfunction number in bl |
||
930 | ; device number in bh |
||
931 | ; ecx, edx, .. depends on subfunction |
||
932 | ; |
||
933 | ; OUT: |
||
934 | ; |
||
935 | ;--------------------------------------------------------------------------- |
||
936 | align 4 |
||
937 | IPv4_API: |
||
938 | |||
939 | movzx eax, bh |
||
940 | shl eax, 2 |
||
941 | |||
942 | test bl, bl |
||
943 | jz .packets_tx ; 0 |
||
944 | dec bl |
||
945 | jz .packets_rx ; 1 |
||
946 | dec bl |
||
947 | jz .read_ip ; 2 |
||
948 | dec bl |
||
949 | jz .write_ip ; 3 |
||
950 | dec bl |
||
951 | jz .read_dns ; 4 |
||
952 | dec bl |
||
953 | jz .write_dns ; 5 |
||
954 | dec bl |
||
955 | jz .read_subnet ; 6 |
||
956 | dec bl |
||
957 | jz .write_subnet ; 7 |
||
958 | dec bl |
||
959 | jz .read_gateway ; 8 |
||
960 | dec bl |
||
961 | jz .write_gateway ; 9 |
||
962 | |||
1473 | hidnplayr | 963 | .error: |
1159 | hidnplayr | 964 | mov eax, -1 |
965 | ret |
||
966 | |||
1473 | hidnplayr | 967 | .packets_tx: |
1159 | hidnplayr | 968 | add eax, IP_PACKETS_TX |
969 | mov eax, [eax] |
||
970 | ret |
||
971 | |||
1473 | hidnplayr | 972 | .packets_rx: |
1159 | hidnplayr | 973 | add eax, IP_PACKETS_RX |
974 | mov eax, [eax] |
||
975 | ret |
||
976 | |||
1473 | hidnplayr | 977 | .read_ip: |
1159 | hidnplayr | 978 | add eax, IP_LIST |
979 | mov eax, [eax] |
||
980 | ret |
||
981 | |||
1473 | hidnplayr | 982 | .write_ip: |
1159 | hidnplayr | 983 | add eax, IP_LIST |
984 | mov [eax], ecx |
||
985 | xor eax, eax |
||
986 | ret |
||
987 | |||
1473 | hidnplayr | 988 | .read_dns: |
1159 | hidnplayr | 989 | add eax, DNS_LIST |
990 | mov eax, [eax] |
||
991 | ret |
||
992 | |||
1473 | hidnplayr | 993 | .write_dns: |
1159 | hidnplayr | 994 | add eax, DNS_LIST |
995 | mov [eax], ecx |
||
996 | xor eax, eax |
||
997 | ret |
||
998 | |||
1473 | hidnplayr | 999 | .read_subnet: |
1159 | hidnplayr | 1000 | add eax, SUBNET_LIST |
1001 | mov eax, [eax] |
||
1002 | ret |
||
1003 | |||
1473 | hidnplayr | 1004 | .write_subnet: |
1159 | hidnplayr | 1005 | add eax, SUBNET_LIST |
1006 | mov [eax], ecx |
||
1007 | xor eax, eax |
||
1008 | ret |
||
1009 | |||
1473 | hidnplayr | 1010 | .read_gateway: |
1159 | hidnplayr | 1011 | add eax, GATEWAY_LIST |
1012 | mov eax, [eax] |
||
1013 | ret |
||
1014 | |||
1473 | hidnplayr | 1015 | .write_gateway: |
1159 | hidnplayr | 1016 | add eax, GATEWAY_LIST |
1017 | mov [eax], ecx |
||
1018 | xor eax, eax |
||
1529 | hidnplayr | 1019 | ret |