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1159 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2008. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;; IP.INC ;; |
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7 | ;; ;; |
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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 | |||
19 | $Revision: 922 $ |
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20 | |||
21 | ; IP underlying protocols numbers |
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22 | |||
23 | ETHER_IPv4 equ 0x0008 ; Reversed from 0800 for intel |
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24 | |||
25 | MAX_FRAGMENTS equ 16 |
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26 | MAX_IP equ MAX_NET_DEVICES |
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27 | |||
28 | struct IPv4_Packet |
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29 | .VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits] |
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30 | .TypeOfService db ? |
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31 | .TotalLength dw ? |
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32 | .Identification dw ? |
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33 | .FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15] |
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34 | .TimeToLive db ? ; |
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35 | .Protocol db ? |
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36 | .HeaderChecksum dw ? |
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37 | .SourceAddress dd ? |
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38 | .DestinationAddress dd ? |
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39 | .DataOrOptional: |
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40 | ends |
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41 | |||
42 | struct FRAGMENT_slot |
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43 | .ttl dw ? ; Time to live for this entry, 0 for empty slot's |
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44 | .id dw ? ; Identification field from IP header |
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45 | .SrcIP dd ? ; .. from IP header |
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46 | .DstIP dd ? ; .. from IP header |
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47 | .ptr dd ? ; Pointer to first packet |
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48 | .size: |
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49 | ends |
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50 | |||
51 | struct FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets |
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52 | .PrevPtr dd ? ; Pointer to previous fragment entry (-1 for first packet) |
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53 | .NextPtr dd ? ; Pointer to next fragment entry (-1 for last packet) |
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54 | .Owner dd ? ; Pointer to structure of driver |
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55 | rb 2 ; to match ethernet header size |
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56 | .Data: ; Ip header begins here (we will need the IP header to re-construct the complete packet) |
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57 | ends |
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58 | |||
59 | align 4 |
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60 | uglobal |
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61 | BROADCAST dd ? |
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62 | IP_LIST rd MAX_IP |
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63 | SUBNET_LIST rd MAX_IP |
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64 | DNS_LIST rd MAX_IP |
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65 | GATEWAY_LIST rd MAX_IP |
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66 | IP_PACKETS_TX rd MAX_IP |
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67 | IP_PACKETS_RX rd MAX_IP |
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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 | ; IN: / |
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79 | ; OUT: / |
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80 | ; |
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81 | ;----------------------------------------------------------------- |
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82 | |||
83 | align 4 |
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84 | IPv4_init: |
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85 | |||
86 | or eax, -1 |
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87 | mov edi, BROADCAST |
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88 | mov ecx, 1+4*MAX_IP |
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89 | rep stosd |
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90 | |||
91 | xor eax, eax |
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92 | mov edi, FRAGMENT_LIST |
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93 | mov ecx, FRAGMENT_slot.size*MAX_FRAGMENTS/4 + 2*MAX_IP |
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94 | rep stosd |
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95 | |||
96 | ret |
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97 | |||
98 | |||
99 | |||
100 | ;----------------------------------------------------------------- |
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101 | ; |
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102 | ; IP_Handler: |
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103 | ; |
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104 | ; Called by eth_handler, |
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105 | ; will check if IP Packet isnt damaged |
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106 | ; and call appropriate handler. (TCP/UDP/ICMP/..) |
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107 | ; |
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108 | ; It will also re-construct fragmented packets |
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109 | ; |
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110 | ; IN: Pointer to buffer in [esp] |
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111 | ; size of buffer in [esp+4] |
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112 | ; pointer to device struct in ebx |
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113 | ; pointer to IP Packet data in edx |
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114 | ; OUT: / |
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115 | ; |
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116 | ;----------------------------------------------------------------- |
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117 | |||
118 | align 4 |
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119 | IPv4_Handler: |
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120 | |||
121 | DEBUGF 1,"IP_Handler - start\n" |
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122 | mov cx , [edx + IPv4_Packet.HeaderChecksum] |
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123 | xchg ch , cl ; Get the checksum in intel format |
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124 | |||
125 | mov word [edx + IPv4_Packet.HeaderChecksum], 0 ; Clear checksum field to recalculating checksum |
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126 | |||
127 | movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field |
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128 | and eax, 0x0000000F ; |
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129 | shl eax, 2 ; |
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130 | |||
131 | push edx |
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132 | stdcall checksum_jb, edx, eax ; buf_ptr, buf_size |
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133 | pop edx |
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134 | cmp cx , ax |
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135 | jnz .dump ; if CHECKSUM isn't valid then dump Packet |
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136 | |||
137 | mov eax, [edx + IPv4_Packet.DestinationAddress] |
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138 | mov edi, BROADCAST |
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139 | mov ecx, MAX_IP+1 |
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140 | repnz scasd |
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141 | jz .ip_ok |
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142 | |||
143 | not eax |
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144 | test eax, 127 shl 24 ; 127.x.x.x |
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145 | jz .ip_ok |
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146 | |||
147 | ; TODO: we need to check for broadcasts (other then 255.255.255.255) |
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148 | |||
149 | jmp .dump |
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150 | |||
151 | .ip_ok: |
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152 | |||
153 | DEBUGF 1,"IP_Handler - packet from %u.%u.%u.%u\n",\ |
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154 | [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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155 | |||
156 | mov al , [edx + IPv4_Packet.VersionAndIHL] |
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157 | and al , 0x0f ; get IHL(header length) |
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158 | cmp al , 0x05 ; IHL!= 5*4(20 bytes) |
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159 | jnz .dump ; TODO: dont dump packets wich have optional fiels !!! /!\ |
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160 | |||
161 | cmp byte [edx + IPv4_Packet.TimeToLive], 0 |
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162 | je .dump |
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163 | |||
164 | movzx eax, word [edx + IPv4_Packet.FlagsAndFragmentOffset] |
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165 | xchg al , ah |
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166 | |||
167 | test ax , 1 shl 13 ; Is 'more fragments' flag set ? |
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168 | jnz .yes_fragments ; If so, we definately have a fragmented packet |
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169 | |||
170 | test ax , 0x1fff ; If flag is not set, but there is a fragment offset, the packet is last in series of fragmented packets |
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171 | jnz .last_fragment |
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172 | |||
173 | .handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed |
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174 | movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field |
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175 | and eax, 0x0000000F ; |
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176 | shl eax, 2 ; |
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177 | |||
178 | movzx ecx, word [edx + IPv4_Packet.TotalLength] ; Calculate length of encapsulated Packet |
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179 | xchg cl , ch ; |
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180 | sub ecx, eax ; |
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181 | |||
182 | add eax, edx |
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183 | push eax |
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184 | mov al , [edx + IPv4_Packet.Protocol] |
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185 | pop edx ; Offset to data (tcp/udp/icmp/.. Packet) |
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186 | |||
187 | cmp al , IP_PROTO_TCP |
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188 | ; je TCP_Handler |
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189 | |||
190 | cmp al , IP_PROTO_UDP |
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191 | je UDP_Handler |
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192 | |||
193 | cmp al , IP_PROTO_ICMP |
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194 | je ICMP_Handler |
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195 | |||
196 | DEBUGF 1,"IP_Handler - unknown protocol:%u\n",al |
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197 | |||
198 | .dump: |
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199 | DEBUGF 1,"IP_Handler - done\n" |
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200 | ; inc [dumped_rx_count] |
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201 | call kernel_free |
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202 | add esp, 4 ; pop (balance stack) |
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203 | ret |
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204 | |||
205 | |||
206 | .yes_fragments: |
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207 | shl ax , 3 |
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208 | DEBUGF 1,"Fragmented packet, offset:%u, id:%x\n", ax, [edx + IPv4_Packet.Identification]:4 |
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209 | |||
210 | test ax , ax ; Is this the first packet of the fragment? |
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211 | jnz .not_first_fragment |
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212 | |||
213 | DEBUGF 1,"First fragmented packet received!\n" |
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214 | ; try to locate a free slot.. |
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215 | mov ecx, MAX_FRAGMENTS |
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216 | mov esi, FRAGMENT_LIST |
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217 | .find_free_slot: |
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218 | cmp word [esi + FRAGMENT_slot.ttl], 0 |
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219 | je .found_free_slot |
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220 | add esi, FRAGMENT_slot.size |
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221 | loop .find_free_slot |
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222 | jmp .dump ; If no free slot was found, dump the packet |
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223 | |||
224 | .found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure |
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225 | mov word [esi + FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl |
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226 | mov ax , word [edx + IPv4_Packet.Identification] |
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227 | mov word [esi + FRAGMENT_slot.id], ax |
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228 | mov eax, dword [edx + IPv4_Packet.SourceAddress] |
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229 | mov dword [esi + FRAGMENT_slot.SrcIP], eax |
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230 | mov eax, dword [edx + IPv4_Packet.DestinationAddress] |
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231 | mov dword [esi + FRAGMENT_slot.DstIP], eax |
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232 | pop eax |
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233 | mov dword [esi + FRAGMENT_slot.ptr], eax |
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234 | ; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure |
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235 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
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236 | mov [eax + FRAGMENT_entry.PrevPtr], -1 |
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237 | mov [eax + FRAGMENT_entry.Owner], ebx |
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238 | |||
239 | add esp, 4 ; balance stack and exit |
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240 | ret |
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241 | |||
242 | |||
243 | |||
244 | .not_first_fragment: |
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245 | DEBUGF 1,"Middle fragmented packet received!\n" |
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246 | |||
247 | call .find_fragment_slot |
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248 | cmp esi, -1 |
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249 | je .dump |
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250 | |||
251 | mov word [esi + FRAGMENT_slot.ttl], 15 ; Reset the ttl |
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252 | mov esi, [esi + FRAGMENT_slot.ptr] |
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253 | or edi, -1 |
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254 | .find_last_entry: ; The following routine will try to find the last entry |
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255 | cmp edi, [esi + FRAGMENT_entry.PrevPtr] |
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256 | jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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257 | mov edi, esi |
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258 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
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259 | cmp esi, -1 |
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260 | jne .find_last_entry |
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261 | ; We found the last entry (pointer is noww in edi) |
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262 | ; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure |
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263 | |||
264 | pop eax ; pointer to packet |
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265 | mov [edi + FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry |
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266 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
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267 | mov [eax + FRAGMENT_entry.PrevPtr], edi |
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268 | mov [eax + FRAGMENT_entry.Owner], ebx |
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269 | |||
270 | add esp, 4 |
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271 | ret |
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272 | |||
273 | |||
274 | |||
275 | .last_fragment: |
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276 | DEBUGF 1,"Last fragmented packet received!\n" |
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277 | call .find_fragment_slot |
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278 | cmp esi, -1 |
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279 | je .dump |
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280 | |||
281 | 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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282 | push esi |
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283 | xor eax, eax ; |
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284 | or edi, -1 |
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285 | .count_bytes: |
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286 | cmp [esi + FRAGMENT_entry.PrevPtr], edi |
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287 | jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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288 | mov cx, word [esi + FRAGMENT_entry.Data + IPv4_Packet.TotalLength] ; Add total length |
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289 | xchg cl, ch |
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290 | DEBUGF 1,"Packet size: %u\n", cx |
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291 | add ax, cx |
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292 | movzx cx, byte [esi + FRAGMENT_entry.Data + IPv4_Packet.VersionAndIHL] ; Sub Header length |
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293 | and cx, 0x000F |
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294 | shl cx, 2 |
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295 | DEBUGF 1,"Header size: %u\n", cx |
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296 | sub ax, cx |
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297 | mov edi, esi |
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298 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
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299 | cmp esi, -1 |
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300 | jne .count_bytes |
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301 | |||
302 | mov esi, [esp+4] ;;; |
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303 | mov [edi + FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code |
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304 | mov [esi + FRAGMENT_entry.NextPtr], -1 |
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305 | mov [esi + FRAGMENT_entry.PrevPtr], edi |
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306 | mov [esi + FRAGMENT_entry.Owner], ebx |
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307 | |||
308 | mov cx, [edx + IPv4_Packet.TotalLength] ; Note: This time we dont substract Header length |
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309 | xchg cl , ch |
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310 | DEBUGF 1,"Packet size: %u\n", cx |
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311 | add ax , cx |
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312 | DEBUGF 1,"Total Received data size: %u\n", eax |
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313 | |||
314 | push eax |
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315 | mov ax , [edx + IPv4_Packet.FlagsAndFragmentOffset] |
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316 | xchg al , ah |
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317 | shl ax , 3 |
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318 | add cx , ax |
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319 | pop eax |
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320 | DEBUGF 1,"Total Fragment size: %u\n", ecx |
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321 | |||
322 | cmp ax, cx |
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323 | jne .destroy_slot_pop |
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324 | |||
325 | push eax |
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326 | push eax |
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327 | call kernel_alloc |
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328 | test eax, eax |
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329 | je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot |
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330 | mov edx, [esp+4] ; Get pointer to first fragment entry back in edx |
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331 | |||
332 | .rebuild_packet_loop: |
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333 | movzx ecx, word [edx + FRAGMENT_entry.Data + IPv4_Packet.FlagsAndFragmentOffset] ; Calculate the fragment offset |
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334 | xchg cl , ch ; intel byte order |
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335 | shl cx , 3 ; multiply by 8 and clear first 3 bits |
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336 | DEBUGF 1,"Fragment offset: %u\n", cx |
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337 | |||
338 | lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment |
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339 | movzx ebx, byte [edx + FRAGMENT_entry.Data + IPv4_Packet.VersionAndIHL] ; Find header size (in ebx) of fragment |
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340 | and bx , 0x000F ; |
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341 | shl bx , 2 ; |
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342 | |||
343 | lea esi, [edx + FRAGMENT_entry.Data] ; Set esi to the correct begin of fragment |
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344 | movzx ecx, word [edx + FRAGMENT_entry.Data + IPv4_Packet.TotalLength] ; Calculate total length of fragment |
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345 | xchg cl, ch ; intel byte order |
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346 | |||
347 | cmp edi, eax ; Is this packet the first fragment ? |
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348 | je .first_fragment |
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349 | sub cx, bx ; If not, dont copy the header |
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350 | add esi, ebx ; |
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351 | .first_fragment: |
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352 | |||
353 | push cx ; First copy dword-wise, then byte-wise |
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354 | shr cx, 2 ; |
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355 | rep movsd ; |
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356 | pop cx ; |
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357 | and cx, 3 ; |
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358 | rep movsb ; |
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359 | |||
360 | push eax |
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361 | push edx ; Push pointer to fragment onto stack |
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362 | mov edx, [edx + FRAGMENT_entry.NextPtr] ; Set edx to the next pointer |
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363 | call kernel_free ; free the previous fragment buffer (this uses the value from stack) |
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364 | pop eax |
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365 | cmp edx, -1 ; Check if it is last fragment in chain |
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366 | jne .rebuild_packet_loop |
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367 | |||
368 | pop ecx ; |
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369 | xchg cl, ch |
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370 | mov edx, eax |
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371 | mov word [edx + IPv4_Packet.TotalLength], cx |
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372 | add esp, 8 |
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373 | |||
374 | xchg cl, ch ; This prints the IP packet to the debug board (usefull when using serial output debug..) |
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375 | push ecx ;;;; |
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376 | push eax ;;;; |
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377 | ; mov esi, edx ; |
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378 | ; ; |
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379 | ; @@: ; |
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380 | ; lodsb ; |
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381 | ; DEBUGF 1,"%x ", eax:2 ; |
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382 | ; loop @r ; |
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383 | |||
384 | movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field |
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385 | and ax, 0x000F ; |
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386 | shl ax, 2 ; |
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387 | sub ecx, eax ; |
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388 | add eax, edx |
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389 | push eax |
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390 | mov al , [edx + IPv4_Packet.Protocol] |
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391 | pop edx ; Offset to data (tcp/udp/icmp/.. Packet) |
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392 | |||
393 | ; cmp al , PROTOCOL_TCP |
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394 | ; je TCP_Handler |
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395 | |||
396 | ; cmp al , PROTOCOL_UDP |
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397 | ; je UDP_Handler |
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398 | |||
399 | cmp al , IP_PROTO_ICMP |
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400 | je ICMP_Handler_fragments |
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401 | |||
402 | DEBUGF 1,"IP_Handler - unknown protocol:%u\n",al |
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403 | |||
404 | jmp .dump |
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405 | |||
406 | |||
407 | .destroy_slot_pop: |
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408 | add esp, 4 |
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409 | .destroy_slot: |
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410 | DEBUGF 1,"Destroy fragment slot! MUaHaHAhAHA!\n" |
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411 | ; TODO! |
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412 | jmp .dump |
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413 | |||
414 | |||
415 | |||
416 | ;----------------------------------------------------------------- |
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417 | ; |
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418 | ; find fragment slot |
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419 | ; |
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420 | ; IN: pointer to fragmented packet in edx ; TODO: the RFC says we should check protocol too |
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421 | ; OUT: pointer to slot in edi, -1 on error |
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422 | ; |
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423 | ;----------------------------------------------------------------- |
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424 | |||
425 | .find_fragment_slot: |
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426 | |||
427 | push eax ebx ecx edx |
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428 | mov ax , word [edx + IPv4_Packet.Identification] |
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429 | mov ecx, MAX_FRAGMENTS |
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430 | mov esi, FRAGMENT_LIST |
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431 | mov ebx, dword [edx + IPv4_Packet.SourceAddress] |
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432 | mov edx, dword [edx + IPv4_Packet.DestinationAddress] |
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433 | .find_slot: |
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434 | cmp word [esi + FRAGMENT_slot.id], ax |
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435 | jne .try_next |
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436 | cmp dword [esi + FRAGMENT_slot.SrcIP], ebx |
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437 | jne .try_next |
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438 | cmp dword [esi + FRAGMENT_slot.DstIP], edx |
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439 | je .found_slot |
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440 | .try_next: |
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441 | add esi, FRAGMENT_slot.size |
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442 | loop .find_slot |
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443 | ; pop edx ebx |
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444 | or esi, -1 |
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445 | ; ret |
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446 | |||
447 | .found_slot: |
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448 | pop edx ecx ebx eax |
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449 | ret |
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450 | |||
451 | |||
452 | ;----------------------------------------------------------------- |
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453 | ; |
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454 | ; Decrease TimeToLive of all fragment slots |
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455 | ; |
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456 | ; IN: / |
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457 | ; OUT: / |
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458 | ; |
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459 | ;----------------------------------------------------------------- |
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460 | |||
461 | align 4 |
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462 | IPv4_decrease_fragment_ttls: |
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463 | |||
464 | mov esi, FRAGMENT_LIST |
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465 | mov ecx, MAX_FRAGMENTS |
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466 | .loop: |
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467 | cmp [esi + FRAGMENT_slot.ttl], 0 |
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468 | je .try_next |
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469 | dec [esi + FRAGMENT_slot.ttl] |
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470 | jnz .try_next |
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471 | DEBUGF 1,"Fragment slot timed-out!\n" |
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472 | ; TODO: clear all entry's of timed-out slot |
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473 | .try_next: |
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474 | add esi, 4 |
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475 | loop .loop |
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476 | ret |
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477 | |||
478 | |||
479 | |||
480 | |||
481 | |||
482 | ;----------------------------------------------------------------- |
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483 | ; |
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484 | ; Create_IPv4_Packet |
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485 | ; |
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486 | ; IN: eax = dest ip |
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487 | ; ebx = source ip |
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488 | ; ecx = data length |
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489 | ; dx = fragment id |
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490 | ; di = protocol |
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491 | ; |
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492 | ; OUT: eax points to buffer start |
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493 | ; ebx is size of complete buffer |
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494 | ; edi = pointer to start of data (-1 on error) |
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495 | ; ecx = unchanged (packet size of embedded data) |
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496 | ; edx = pointer to device struct (needed for sending procedure) |
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497 | ; esi = pointer to sending procedure |
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498 | ; |
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499 | ;----------------------------------------------------------------- |
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500 | |||
501 | ;;; TODO: create fragmented packets |
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502 | |||
503 | align 4 |
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504 | IPv4_create_Packet: |
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505 | |||
506 | DEBUGF 1,"Create IPv4 Packet\n" |
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507 | |||
508 | cmp ecx, 1514 |
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509 | jg .exit_ |
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510 | |||
511 | cmp eax, -1 |
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512 | je .broadcast ; If it is broadcast, just send |
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513 | |||
514 | push eax |
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515 | stdcall arp_table_manager, ARP_TABLE_IP_TO_MAC, eax, temp_dstmac ;opcode,IP,MAC_ptr - Get the MAC address. |
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516 | cmp eax, ARP_NO_ENTRY |
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517 | pop eax |
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518 | jne .send |
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519 | |||
520 | DEBUGF 1,"Create IPv4 Packet - ARP entry not found!\n" |
||
521 | |||
522 | ; TODO: QUEUE! |
||
523 | or edi, -1 |
||
524 | |||
525 | ret |
||
526 | |||
527 | .broadcast: |
||
528 | mov dword [temp_dstmac], -1 |
||
529 | mov word [temp_dstmac+4], -1 |
||
530 | |||
531 | |||
532 | .send: |
||
533 | push ecx eax ebx dx di |
||
534 | call IPv4_dest_to_dev |
||
535 | mov edi, [ETH_DRV_LIST + 4*edi] |
||
536 | lea eax, [edi + ETH_DEVICE.mac] |
||
537 | mov ebx, temp_dstmac |
||
538 | mov ecx, [esp+12] |
||
539 | add ecx, IPv4_Packet.DataOrOptional |
||
540 | mov di , ETHER_IPv4 |
||
541 | call ETH_create_Packet ; TODO: figure out a way to make this work with other protocols too |
||
542 | cmp edi, -1 |
||
543 | je .exit |
||
544 | |||
545 | mov [edi + IPv4_Packet.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header) |
||
546 | mov [edi + IPv4_Packet.TypeOfService], 0 |
||
547 | xchg ch, cl |
||
548 | mov [edi + IPv4_Packet.TotalLength], cx |
||
549 | mov [edi + IPv4_Packet.FlagsAndFragmentOffset], 0x0000 |
||
550 | mov [edi + IPv4_Packet.TimeToLive], 128 |
||
551 | mov [edi + IPv4_Packet.HeaderChecksum], 0 |
||
552 | pop cx |
||
553 | mov [edi + IPv4_Packet.Protocol], cl |
||
554 | pop cx |
||
555 | mov [edi + IPv4_Packet.Identification], cx |
||
556 | pop ecx |
||
557 | mov [edi + IPv4_Packet.SourceAddress], ecx |
||
558 | pop ecx |
||
559 | mov [edi + IPv4_Packet.DestinationAddress], ecx |
||
560 | |||
561 | push eax |
||
562 | stdcall checksum_jb, edi, IPv4_Packet.DataOrOptional ; buf_ptr, buf_size |
||
563 | xchg al, ah |
||
564 | mov [edi + IPv4_Packet.HeaderChecksum], ax |
||
565 | pop eax ecx |
||
566 | add edi, IPv4_Packet.DataOrOptional |
||
567 | |||
568 | DEBUGF 1,"IPv4 Packet for device %x created successfully\n", edx |
||
569 | |||
570 | ret |
||
571 | |||
572 | .exit: |
||
573 | add esp, 16 |
||
574 | .exit_: |
||
575 | or edi, -1 |
||
576 | ret |
||
577 | |||
578 | |||
579 | uglobal |
||
580 | temp_dstmac dp ? |
||
581 | endg |
||
582 | |||
583 | |||
584 | ;--------------------------------------------------------------------------- |
||
585 | ; |
||
586 | ; IPv4_dest_to_dev |
||
587 | ; |
||
588 | ; IN: Destination IP in eax |
||
589 | ; OUT: device id in edi |
||
590 | ; |
||
591 | ;--------------------------------------------------------------------------- |
||
592 | |||
593 | align 4 |
||
594 | IPv4_dest_to_dev: |
||
595 | |||
596 | DEBUGF 1,"IPv4 destination to device: " |
||
597 | |||
598 | xor edi, edi |
||
599 | mov ecx, MAX_IP |
||
600 | |||
601 | .loop: |
||
602 | mov ebx, [IP_LIST+edi] ; we dont need to worry about non exisiting ip interfaces |
||
603 | and ebx, [SUBNET_LIST+edi] ; they have IP and SUBNET set to all one's, so they will have no match except 255.255.255.255 |
||
604 | ; (only a moron would insert that ip into this function..) |
||
605 | mov edx, eax |
||
606 | and edx, [SUBNET_LIST+edi] |
||
607 | |||
608 | cmp ebx, edx |
||
609 | je .found_it |
||
610 | |||
611 | add edi, 4 |
||
612 | loop .loop |
||
613 | |||
614 | xor edi, edi ; if none found, use device 0 as default device |
||
615 | |||
616 | .found_it: |
||
617 | shr edi, 2 |
||
618 | |||
619 | DEBUGF 1,"%u\n",edi |
||
620 | |||
621 | ret |
||
622 | |||
623 | |||
624 | |||
625 | ;--------------------------------------------------------------------------- |
||
626 | ; |
||
627 | ; IPv4_get_frgmnt_num |
||
628 | ; |
||
629 | ; IN: / |
||
630 | ; OUT: fragment number in ax |
||
631 | ; |
||
632 | ;--------------------------------------------------------------------------- |
||
633 | |||
634 | align 4 |
||
635 | IPv4_get_frgmnt_num: |
||
636 | xor ax, ax ;;; TODO: replace this with real code |
||
637 | |||
638 | ret |
||
639 | |||
640 | |||
641 | ;--------------------------------------------------------------------------- |
||
642 | ; |
||
643 | ; IPv4_API |
||
644 | ; |
||
645 | ; This function is called by system function 75 |
||
646 | ; |
||
647 | ; IN: subfunction number in bl |
||
648 | ; device number in bh |
||
649 | ; ecx, edx, .. depends on subfunction |
||
650 | ; |
||
651 | ; OUT: |
||
652 | ; |
||
653 | ;--------------------------------------------------------------------------- |
||
654 | |||
655 | align 4 |
||
656 | IPv4_API: |
||
657 | |||
658 | movzx eax, bh |
||
659 | shl eax, 2 |
||
660 | |||
661 | test bl, bl |
||
662 | jz .packets_tx ; 0 |
||
663 | dec bl |
||
664 | jz .packets_rx ; 1 |
||
665 | dec bl |
||
666 | jz .read_ip ; 2 |
||
667 | dec bl |
||
668 | jz .write_ip ; 3 |
||
669 | dec bl |
||
670 | jz .read_dns ; 4 |
||
671 | dec bl |
||
672 | jz .write_dns ; 5 |
||
673 | dec bl |
||
674 | jz .read_subnet ; 6 |
||
675 | dec bl |
||
676 | jz .write_subnet ; 7 |
||
677 | dec bl |
||
678 | jz .read_gateway ; 8 |
||
679 | dec bl |
||
680 | jz .write_gateway ; 9 |
||
681 | |||
682 | .error: |
||
683 | mov eax, -1 |
||
684 | ret |
||
685 | |||
686 | .packets_tx: |
||
687 | add eax, IP_PACKETS_TX |
||
688 | mov eax, [eax] |
||
689 | ret |
||
690 | |||
691 | .packets_rx: |
||
692 | add eax, IP_PACKETS_RX |
||
693 | mov eax, [eax] |
||
694 | ret |
||
695 | |||
696 | .read_ip: |
||
697 | add eax, IP_LIST |
||
698 | mov eax, [eax] |
||
699 | ret |
||
700 | |||
701 | .write_ip: |
||
702 | add eax, IP_LIST |
||
703 | mov [eax], ecx |
||
704 | xor eax, eax |
||
705 | ret |
||
706 | |||
707 | .read_dns: |
||
708 | add eax, DNS_LIST |
||
709 | mov eax, [eax] |
||
710 | ret |
||
711 | |||
712 | .write_dns: |
||
713 | add eax, DNS_LIST |
||
714 | mov [eax], ecx |
||
715 | xor eax, eax |
||
716 | ret |
||
717 | |||
718 | .read_subnet: |
||
719 | add eax, SUBNET_LIST |
||
720 | mov eax, [eax] |
||
721 | ret |
||
722 | |||
723 | .write_subnet: |
||
724 | add eax, SUBNET_LIST |
||
725 | mov [eax], ecx |
||
726 | xor eax, eax |
||
727 | ret |
||
728 | |||
729 | .read_gateway: |
||
730 | add eax, GATEWAY_LIST |
||
731 | mov eax, [eax] |
||
732 | ret |
||
733 | |||
734 | .write_gateway: |
||
735 | add eax, GATEWAY_LIST |
||
736 | mov [eax], ecx |
||
737 | xor eax, eax |
||
738 | ret |
||
739 |