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4429 | Serge | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2013. 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 | ;; IPv4.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: 3515 $ |
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20 | |||
21 | IPv4_MAX_FRAGMENTS = 64 |
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22 | IPv4_MAX_ROUTES = 64 |
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23 | |||
24 | IPv4_ROUTE_FLAG_UP = 1 shl 0 |
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25 | IPv4_ROUTE_FLAG_GATEWAY = 1 shl 1 |
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26 | IPv4_ROUTE_FLAG_HOST = 1 shl 2 |
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27 | IPv4_ROUTE_FLAG_D = 1 shl 3 ; Route was created by a redirect |
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28 | IPv4_ROUTE_FLAG_M = 1 shl 4 ; Route was modified by a redirect |
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29 | |||
30 | struct IPv4_header |
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31 | |||
32 | VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits] |
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33 | TypeOfService db ? ; precedence [7-5] minimize delay [4], maximize throughput [3], maximize riliability [2] minimize momentary cost [1] and zero [0] |
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34 | TotalLength dw ? |
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35 | Identification dw ? |
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36 | FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15] |
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37 | TimeToLive db ? ; |
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38 | Protocol db ? |
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39 | HeaderChecksum dw ? |
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40 | SourceAddress dd ? |
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41 | DestinationAddress dd ? |
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42 | |||
43 | ends |
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44 | |||
45 | struct IPv4_FRAGMENT_slot |
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46 | |||
47 | ttl dw ? ; Time to live for this entry, 0 for empty slot's |
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48 | id dw ? ; Identification field from IP header |
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49 | SrcIP dd ? ; .. from IP header |
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50 | DstIP dd ? ; .. from IP header |
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51 | ptr dd ? ; Pointer to first packet |
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52 | |||
53 | ends |
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54 | |||
55 | struct IPv4_FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets |
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56 | |||
57 | PrevPtr dd ? ; Pointer to previous fragment entry (-1 for first packet) |
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58 | NextPtr dd ? ; Pointer to next fragment entry (-1 for last packet) |
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59 | Owner dd ? ; Pointer to structure of driver |
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60 | rb 2 ; to match ethernet header size ;;; FIXME |
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61 | ; Ip header begins here (we will need the IP header to re-construct the complete packet) |
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62 | ends |
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63 | |||
64 | struct IPv4_ROUTE |
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65 | |||
66 | Destination dd ? |
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67 | Gateway dd ? |
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68 | Flags dd ? |
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69 | Use dd ? |
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70 | Interface dd ? |
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71 | |||
72 | ends |
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73 | |||
74 | |||
75 | uglobal |
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76 | align 4 |
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77 | |||
78 | IP_LIST rd NET_DEVICES_MAX |
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79 | SUBNET_LIST rd NET_DEVICES_MAX |
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80 | DNS_LIST rd NET_DEVICES_MAX |
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81 | GATEWAY_LIST rd NET_DEVICES_MAX |
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82 | BROADCAST_LIST rd NET_DEVICES_MAX |
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83 | |||
84 | IPv4_packets_tx rd NET_DEVICES_MAX |
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85 | IPv4_packets_rx rd NET_DEVICES_MAX |
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86 | IPv4_packets_dumped rd NET_DEVICES_MAX |
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87 | |||
88 | IPv4_FRAGMENT_LIST rb IPv4_MAX_FRAGMENTS * sizeof.IPv4_FRAGMENT_slot |
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89 | |||
90 | IPv4_ROUTES rd IPv4_MAX_ROUTES * sizeof.IPv4_ROUTE |
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91 | |||
92 | endg |
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93 | |||
94 | |||
95 | ;----------------------------------------------------------------- |
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96 | ; |
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97 | ; IPv4_init |
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98 | ; |
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99 | ; This function resets all IP variables |
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100 | ; |
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101 | ;----------------------------------------------------------------- |
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102 | macro IPv4_init { |
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103 | |||
104 | xor eax, eax |
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105 | mov edi, IP_LIST |
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106 | mov ecx, 7*NET_DEVICES_MAX + (sizeof.IPv4_FRAGMENT_slot*IPv4_MAX_FRAGMENTS)/4 |
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107 | rep stosd |
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108 | |||
109 | } |
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110 | |||
111 | |||
112 | ;----------------------------------------------------------------- |
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113 | ; |
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114 | ; Decrease TimeToLive of all fragment slots |
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115 | ; |
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116 | ;----------------------------------------------------------------- |
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117 | macro IPv4_decrease_fragment_ttls { |
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118 | |||
119 | local .loop, .next |
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120 | |||
121 | mov esi, IPv4_FRAGMENT_LIST |
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122 | mov ecx, IPv4_MAX_FRAGMENTS |
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123 | .loop: |
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124 | cmp [esi + IPv4_FRAGMENT_slot.ttl], 0 |
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125 | je .next |
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126 | dec [esi + IPv4_FRAGMENT_slot.ttl] |
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127 | jz .died |
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128 | .next: |
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129 | add esi, sizeof.IPv4_FRAGMENT_slot |
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130 | dec ecx |
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131 | jnz .loop |
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132 | jmp .done |
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133 | |||
134 | .died: |
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135 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4 Fragment slot timed-out!\n" |
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136 | ;;; TODO: clear all entry's of timed-out slot |
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137 | jmp .next |
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138 | |||
139 | .done: |
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140 | } |
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141 | |||
142 | |||
143 | |||
144 | macro IPv4_checksum ptr { |
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145 | |||
146 | ; This is the fast procedure to create or check an IP header without options |
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147 | ; To create a new checksum, the checksum field must be set to 0 before computation |
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148 | ; 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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149 | |||
150 | push ebx |
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151 | xor ebx, ebx |
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152 | add bl, [ptr+1] |
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153 | adc bh, [ptr+0] |
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154 | |||
155 | adc bl, [ptr+3] |
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156 | adc bh, [ptr+2] |
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157 | |||
158 | adc bl, [ptr+5] |
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159 | adc bh, [ptr+4] |
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160 | |||
161 | adc bl, [ptr+7] |
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162 | adc bh, [ptr+6] |
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163 | |||
164 | adc bl, [ptr+9] |
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165 | adc bh, [ptr+8] |
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166 | |||
167 | ; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation |
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168 | |||
169 | adc bl, [ptr+13] |
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170 | adc bh, [ptr+12] |
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171 | |||
172 | adc bl, [ptr+15] |
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173 | adc bh, [ptr+14] |
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174 | |||
175 | adc bl, [ptr+17] |
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176 | adc bh, [ptr+16] |
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177 | |||
178 | adc bl, [ptr+19] |
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179 | adc bh, [ptr+18] |
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180 | |||
181 | adc ebx, 0 |
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182 | |||
183 | push ecx |
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184 | mov ecx, ebx |
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185 | shr ecx, 16 |
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186 | and ebx, 0xffff |
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187 | add ebx, ecx |
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188 | |||
189 | mov ecx, ebx |
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190 | shr ecx, 16 |
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191 | add ebx, ecx |
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192 | |||
193 | not bx |
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194 | jnz .not_zero |
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195 | dec bx |
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196 | .not_zero: |
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197 | xchg bl, bh |
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198 | pop ecx |
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199 | |||
200 | neg word [ptr+10] ; zero will stay zero so we just get the checksum |
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201 | add word [ptr+10], bx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :) |
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202 | pop ebx |
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203 | |||
204 | } |
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205 | |||
206 | |||
207 | |||
208 | ;----------------------------------------------------------------- |
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209 | ; |
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210 | ; IPv4_input: |
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211 | ; |
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212 | ; Will check if IPv4 Packet isnt damaged |
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213 | ; and call appropriate handler. (TCP/UDP/ICMP/..) |
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214 | ; |
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215 | ; It will also re-construct fragmented packets |
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216 | ; |
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217 | ; IN: Pointer to buffer in [esp] |
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218 | ; size of buffer in [esp+4] |
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219 | ; pointer to device struct in ebx |
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220 | ; pointer to IPv4 header in edx |
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221 | ; size of IPv4 packet in ecx |
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222 | ; OUT: / |
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223 | ; |
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224 | ;----------------------------------------------------------------- |
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225 | align 4 |
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226 | IPv4_input: ; TODO: add IPv4 raw sockets support |
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227 | |||
228 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input, packet from: %u.%u.%u.%u ",\ |
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229 | [edx + IPv4_header.SourceAddress + 0]:1,[edx + IPv4_header.SourceAddress + 1]:1,\ |
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230 | [edx + IPv4_header.SourceAddress + 2]:1,[edx + IPv4_header.SourceAddress + 3]:1 |
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231 | DEBUGF DEBUG_NETWORK_VERBOSE, "to: %u.%u.%u.%u\n",\ |
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232 | [edx + IPv4_header.DestinationAddress + 0]:1,[edx + IPv4_header.DestinationAddress + 1]:1,\ |
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233 | [edx + IPv4_header.DestinationAddress + 2]:1,[edx + IPv4_header.DestinationAddress + 3]:1 |
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234 | |||
235 | ;------------------------------- |
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236 | ; re-calculate the checksum |
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237 | |||
238 | IPv4_checksum edx |
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239 | jnz .dump ; if checksum isn't valid then dump packet |
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240 | |||
241 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Checksum ok\n" |
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242 | |||
243 | ;----------------------------------- |
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244 | ; Check if destination IP is correct |
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245 | |||
246 | call NET_ptr_to_num4 |
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247 | |||
248 | ; check if it matches local ip (Using RFC1122 strong end system model) |
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249 | |||
250 | mov eax, [edx + IPv4_header.DestinationAddress] |
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251 | cmp eax, [IP_LIST + edi] |
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252 | je .ip_ok |
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253 | |||
254 | ; check for broadcast (IP or (not SUBNET)) |
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255 | |||
256 | cmp eax, [BROADCAST_LIST + edi] |
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257 | je .ip_ok |
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258 | |||
259 | ; or a special broadcast (255.255.255.255) |
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260 | |||
261 | cmp eax, 0xffffffff |
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262 | je .ip_ok |
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263 | |||
264 | ; maybe it's a multicast (224.0.0.0/4) |
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265 | |||
266 | and eax, 0x0fffffff |
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267 | cmp eax, 224 |
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268 | je .ip_ok |
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269 | |||
4993 | Serge | 270 | ; maybe we just dont have an IP yet and should accept everything on the IP level |
4429 | Serge | 271 | |
4993 | Serge | 272 | cmp [IP_LIST + edi], 0 |
4429 | Serge | 273 | je .ip_ok |
274 | |||
275 | ; or it's just not meant for us.. :( |
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276 | |||
277 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Destination address does not match!\n" |
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278 | jmp .dump |
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279 | |||
280 | ;------------------------ |
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281 | ; Now we can update stats |
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282 | |||
283 | .ip_ok: |
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284 | inc [IPv4_packets_rx + edi] |
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285 | |||
286 | ;---------------------------------- |
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287 | ; Check if the packet is fragmented |
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288 | |||
289 | test [edx + IPv4_header.FlagsAndFragmentOffset], 1 shl 5 ; Is 'more fragments' flag set ? |
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290 | jnz .has_fragments ; If so, we definately have a fragmented packet |
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291 | |||
292 | test [edx + IPv4_header.FlagsAndFragmentOffset], 0xff1f ; If flag is not set, but there is a fragment offset, the packet is last in series of fragmented packets |
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293 | jnz .is_last_fragment |
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294 | |||
295 | ;------------------------------------------------------------------- |
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296 | ; No, it's just a regular IP packet, pass it to the higher protocols |
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297 | |||
298 | .handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed |
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299 | |||
300 | movzx esi, [edx + IPv4_header.VersionAndIHL] ; Calculate Header length by using IHL field |
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301 | and esi, 0x0000000f ; |
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302 | shl esi, 2 ; |
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303 | |||
304 | movzx ecx, [edx + IPv4_header.TotalLength] ; Calculate length of encapsulated Packet |
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305 | xchg cl, ch ; |
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306 | sub ecx, esi ; |
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307 | |||
308 | lea edi, [edx + IPv4_header.SourceAddress] ; make edi ptr to source and dest IPv4 address |
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309 | mov al, [edx + IPv4_header.Protocol] |
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310 | add esi, edx ; make esi ptr to data |
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311 | |||
312 | cmp al, IP_PROTO_TCP |
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313 | je TCP_input |
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314 | |||
315 | cmp al, IP_PROTO_UDP |
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316 | je UDP_input |
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317 | |||
318 | cmp al, IP_PROTO_ICMP |
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319 | je ICMP_input |
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320 | |||
321 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: unknown protocol %u\n", al |
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322 | |||
323 | .dump: |
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324 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: dumping\n" |
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325 | inc [IPv4_packets_dumped] ; FIXME: use correct interface |
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326 | call NET_packet_free |
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327 | add esp, 4 ; pop (balance stack) |
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328 | ret |
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329 | |||
330 | |||
331 | ;--------------------------- |
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332 | ; Fragmented packet handler |
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333 | |||
334 | |||
335 | .has_fragments: |
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336 | movzx eax, [edx + IPv4_header.FlagsAndFragmentOffset] |
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337 | xchg al, ah |
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338 | shl ax, 3 |
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339 | |||
340 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: fragmented packet offset=%u id=%x ptr=0x%x\n", ax, [edx + IPv4_header.Identification]:4, edx |
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341 | |||
342 | test ax, ax ; Is this the first packet of the fragment? |
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343 | jz .is_first_fragment |
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344 | |||
345 | |||
346 | ;------------------------------------------------------- |
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347 | ; We have a fragmented IP packet, but it's not the first |
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348 | |||
349 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Middle fragment packet received!\n" |
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350 | |||
351 | call IPv4_find_fragment_slot |
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352 | cmp esi, -1 |
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353 | je .dump |
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354 | |||
355 | mov [esi + IPv4_FRAGMENT_slot.ttl], 15 ; Reset the ttl |
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356 | mov esi, [esi + IPv4_FRAGMENT_slot.ptr] |
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357 | or edi, -1 |
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358 | .find_last_entry: ; The following routine will try to find the last entry |
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359 | cmp edi, [esi + IPv4_FRAGMENT_entry.PrevPtr] |
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360 | jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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361 | mov edi, esi |
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362 | mov esi, [esi + IPv4_FRAGMENT_entry.NextPtr] |
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363 | cmp esi, -1 |
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364 | jne .find_last_entry |
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365 | ; We found the last entry (pointer is now in edi) |
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366 | ; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure |
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367 | |||
368 | pop eax ; pointer to packet |
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369 | mov [edi + IPv4_FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry |
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370 | mov [eax + IPv4_FRAGMENT_entry.NextPtr], -1 |
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371 | mov [eax + IPv4_FRAGMENT_entry.PrevPtr], edi |
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372 | mov [eax + IPv4_FRAGMENT_entry.Owner], ebx |
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373 | |||
374 | add esp, 4 |
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375 | ret |
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376 | |||
377 | |||
378 | ;------------------------------------ |
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379 | ; We have received the first fragment |
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380 | |||
381 | .is_first_fragment: |
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382 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: First fragment packet received!\n" |
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383 | ; try to locate a free slot.. |
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384 | mov ecx, IPv4_MAX_FRAGMENTS |
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385 | mov esi, IPv4_FRAGMENT_LIST |
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386 | .find_free_slot: |
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387 | cmp word [esi + IPv4_FRAGMENT_slot.ttl], 0 |
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388 | je .found_free_slot |
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389 | add esi, sizeof.IPv4_FRAGMENT_slot |
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390 | loop .find_free_slot |
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391 | jmp .dump ; If no free slot was found, dump the packet |
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392 | |||
393 | .found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure |
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394 | mov [esi + IPv4_FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl |
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395 | mov ax, [edx + IPv4_header.Identification] |
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396 | mov [esi + IPv4_FRAGMENT_slot.id], ax |
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397 | mov eax, [edx + IPv4_header.SourceAddress] |
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398 | mov [esi + IPv4_FRAGMENT_slot.SrcIP], eax |
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399 | mov eax, [edx + IPv4_header.DestinationAddress] |
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400 | mov [esi + IPv4_FRAGMENT_slot.DstIP], eax |
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401 | pop eax |
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402 | mov [esi + IPv4_FRAGMENT_slot.ptr], eax |
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403 | ; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure |
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404 | mov [eax + IPv4_FRAGMENT_entry.NextPtr], -1 |
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405 | mov [eax + IPv4_FRAGMENT_entry.PrevPtr], -1 |
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406 | mov [eax + IPv4_FRAGMENT_entry.Owner], ebx |
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407 | |||
408 | add esp, 4 ; balance stack and exit |
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409 | ret |
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410 | |||
411 | |||
412 | ;----------------------------------- |
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413 | ; We have received the last fragment |
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414 | |||
415 | .is_last_fragment: |
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416 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Last fragment packet received!\n" |
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417 | |||
418 | call IPv4_find_fragment_slot |
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419 | cmp esi, -1 |
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420 | je .dump |
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421 | |||
422 | mov esi, [esi + IPv4_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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423 | push esi |
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424 | xor eax, eax |
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425 | or edi, -1 |
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426 | |||
427 | .count_bytes: |
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428 | cmp [esi + IPv4_FRAGMENT_entry.PrevPtr], edi |
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429 | jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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430 | mov cx, [esi + sizeof.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Add total length |
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431 | xchg cl, ch |
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432 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet size=%u\n", cx |
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433 | add ax, cx |
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434 | movzx cx, [esi + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Sub Header length |
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435 | and cx, 0x000F |
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436 | shl cx, 2 |
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437 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Header size=%u\n", cx |
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438 | sub ax, cx |
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439 | mov edi, esi |
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440 | mov esi, [esi + IPv4_FRAGMENT_entry.NextPtr] |
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441 | cmp esi, -1 |
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442 | jne .count_bytes |
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443 | |||
444 | mov esi, [esp+4] |
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445 | mov [edi + IPv4_FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code |
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446 | mov [esi + IPv4_FRAGMENT_entry.NextPtr], -1 |
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447 | mov [esi + IPv4_FRAGMENT_entry.PrevPtr], edi |
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448 | mov [esi + IPv4_FRAGMENT_entry.Owner], ebx |
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449 | |||
450 | mov cx, [edx + IPv4_header.TotalLength] ; Note: This time we dont substract Header length |
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451 | xchg cl, ch |
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452 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet size=%u\n", cx |
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453 | add ax, cx |
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454 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Total Received data size=%u\n", eax |
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455 | |||
456 | push eax |
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457 | mov ax, [edx + IPv4_header.FlagsAndFragmentOffset] |
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458 | xchg al, ah |
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459 | shl ax, 3 |
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460 | add cx, ax |
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461 | pop eax |
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462 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Total Fragment size=%u\n", ecx |
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463 | |||
464 | cmp ax, cx |
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465 | jne .destroy_slot_pop |
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466 | |||
467 | push eax |
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468 | push eax |
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469 | call kernel_alloc |
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470 | test eax, eax |
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471 | je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot |
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472 | mov edx, [esp+4] ; Get pointer to first fragment entry back in edx |
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473 | |||
474 | .rebuild_packet_loop: |
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475 | movzx ecx, [edx + sizeof.IPv4_FRAGMENT_entry + IPv4_header.FlagsAndFragmentOffset] ; Calculate the fragment offset |
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476 | xchg cl, ch ; intel byte order |
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477 | shl cx, 3 ; multiply by 8 and clear first 3 bits |
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478 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Fragment offset=%u\n", cx |
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479 | |||
480 | lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment |
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481 | movzx ebx, [edx + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment |
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482 | and bx, 0x000F ; |
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483 | shl bx, 2 ; |
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484 | |||
485 | lea esi, [edx + sizeof.IPv4_FRAGMENT_entry] ; Set esi to the correct begin of fragment |
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486 | movzx ecx, [edx + sizeof.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment |
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487 | xchg cl, ch ; intel byte order |
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488 | |||
489 | cmp edi, eax ; Is this packet the first fragment ? |
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490 | je .first_fragment |
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491 | sub cx, bx ; If not, dont copy the header |
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492 | add esi, ebx ; |
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493 | .first_fragment: |
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494 | |||
495 | |||
496 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Copying %u bytes from 0x%x to 0x%x\n", ecx, esi, edi |
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497 | push cx ; First copy dword-wise, then byte-wise |
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498 | shr cx, 2 ; |
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499 | rep movsd ; |
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500 | pop cx ; |
||
501 | and cx, 3 ; |
||
502 | rep movsb ; |
||
503 | |||
504 | push eax |
||
505 | push [edx + IPv4_FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet |
||
506 | push [edx + IPv4_FRAGMENT_entry.NextPtr] ; Set edx to the next pointer |
||
507 | push edx ; Push pointer to fragment onto stack |
||
508 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Next Fragment: 0x%x\n", edx |
||
509 | call NET_packet_free ; free the previous fragment buffer (this uses the value from stack) |
||
510 | pop edx ebx eax |
||
511 | cmp edx, -1 ; Check if it is last fragment in chain |
||
512 | jne .rebuild_packet_loop |
||
513 | |||
514 | pop ecx |
||
515 | xchg cl, ch |
||
516 | mov edx, eax |
||
517 | mov [edx + IPv4_header.TotalLength], cx |
||
518 | add esp, 12 |
||
519 | xchg cl, ch |
||
520 | push ecx edx ; size and pointer |
||
521 | jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr |
||
522 | |||
523 | .destroy_slot_pop: |
||
524 | add esp, 4 |
||
525 | .destroy_slot: |
||
526 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Destroy fragment slot!\n" |
||
527 | ; TODO! |
||
528 | jmp .dump |
||
529 | |||
530 | |||
531 | |||
532 | |||
533 | |||
534 | ;----------------------------------------------------------------- |
||
535 | ; |
||
536 | ; find fragment slot |
||
537 | ; |
||
538 | ; IN: pointer to fragmented packet in edx |
||
539 | ; OUT: pointer to slot in esi, -1 on error |
||
540 | ; |
||
541 | ;----------------------------------------------------------------- |
||
542 | align 4 |
||
543 | IPv4_find_fragment_slot: |
||
544 | |||
545 | ;;; TODO: the RFC says we should check protocol number too |
||
546 | |||
547 | push eax ebx ecx edx |
||
548 | mov ax, [edx + IPv4_header.Identification] |
||
549 | mov ecx, IPv4_MAX_FRAGMENTS |
||
550 | mov esi, IPv4_FRAGMENT_LIST |
||
551 | mov ebx, [edx + IPv4_header.SourceAddress] |
||
552 | mov edx, [edx + IPv4_header.DestinationAddress] |
||
553 | .find_slot: |
||
554 | cmp [esi + IPv4_FRAGMENT_slot.id], ax |
||
555 | jne .try_next |
||
556 | cmp [esi + IPv4_FRAGMENT_slot.SrcIP], ebx |
||
557 | jne .try_next |
||
558 | cmp [esi + IPv4_FRAGMENT_slot.DstIP], edx |
||
559 | je .found_slot |
||
560 | .try_next: |
||
561 | add esi, sizeof.IPv4_FRAGMENT_slot |
||
562 | loop .find_slot |
||
563 | |||
564 | or esi, -1 |
||
565 | .found_slot: |
||
566 | pop edx ecx ebx eax |
||
567 | ret |
||
568 | |||
569 | |||
570 | ;------------------------------------------------------------------ |
||
571 | ; |
||
572 | ; IPv4_output |
||
573 | ; |
||
574 | ; IN: eax = Destination IP |
||
575 | ; ecx = data length |
||
576 | ; edx = Source IP |
||
577 | ; di = TTL shl 8 + protocol |
||
578 | ; |
||
579 | ; OUT: eax = pointer to buffer start |
||
580 | ; ebx = pointer to device struct (needed for sending procedure) |
||
581 | ; ecx = unchanged (packet size of embedded data) |
||
582 | ; edx = size of complete buffer |
||
583 | ; edi = pointer to start of data (0 on error) |
||
584 | ; |
||
585 | ;------------------------------------------------------------------ |
||
586 | align 4 |
||
587 | IPv4_output: |
||
588 | |||
589 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: size=%u ip=0x%x\n", ecx, eax |
||
590 | |||
591 | cmp ecx, 65500 ; Max IPv4 packet size |
||
592 | ja .too_large |
||
593 | |||
594 | push ecx di eax |
||
595 | call IPv4_route ; outputs device number in edi, dest ip in eax, source IP in edx |
||
596 | push edx |
||
597 | |||
598 | test edi, edi |
||
599 | jz .loopback |
||
600 | |||
601 | call ARP_IP_to_MAC |
||
602 | test eax, 0xffff0000 ; error bits |
||
603 | jnz .arp_error |
||
604 | push ebx ; push the mac onto the stack |
||
605 | push ax |
||
606 | |||
607 | inc [IPv4_packets_tx + edi] ; update stats |
||
608 | |||
609 | mov ebx, [NET_DRV_LIST + edi] |
||
610 | lea eax, [ebx + ETH_DEVICE.mac] |
||
611 | mov edx, esp |
||
612 | mov ecx, [esp + 6 + 8 + 2] |
||
613 | add ecx, sizeof.IPv4_header |
||
614 | mov di, ETHER_PROTO_IPv4 |
||
615 | call ETH_output |
||
616 | jz .eth_error |
||
617 | add esp, 6 ; pop the mac out of the stack |
||
618 | |||
619 | .continue: |
||
620 | xchg cl, ch ; internet byte order |
||
621 | mov [edi + IPv4_header.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header) |
||
622 | mov [edi + IPv4_header.TypeOfService], 0 ; nothing special, just plain ip packet |
||
623 | mov [edi + IPv4_header.TotalLength], cx |
||
624 | mov [edi + IPv4_header.Identification], 0 ; fragment id: FIXME |
||
625 | mov [edi + IPv4_header.FlagsAndFragmentOffset], 0 |
||
626 | |||
627 | mov [edi + IPv4_header.HeaderChecksum], 0 |
||
628 | popd [edi + IPv4_header.SourceAddress] |
||
629 | popd [edi + IPv4_header.DestinationAddress] |
||
630 | |||
631 | pop word[edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
||
632 | ; [edi + IPv4_header.Protocol] |
||
633 | |||
634 | pop ecx |
||
635 | |||
636 | IPv4_checksum edi |
||
637 | add edi, sizeof.IPv4_header |
||
638 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: success!\n" |
||
639 | ret |
||
640 | |||
641 | .eth_error: |
||
642 | DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ethernet error\n" |
||
643 | add esp, 3*4+2+6 |
||
644 | xor edi, edi |
||
645 | ret |
||
646 | |||
647 | .arp_error: |
||
648 | DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ARP error=%x\n", eax |
||
649 | add esp, 3*4+2 |
||
650 | xor edi, edi |
||
651 | ret |
||
652 | |||
653 | .too_large: |
||
654 | DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: Packet too large!\n" |
||
655 | xor edi, edi |
||
656 | ret |
||
657 | |||
658 | .loopback: |
||
659 | mov dword [esp + 2], eax ; change source IP to dest IP |
||
660 | mov ecx, [esp + 10] |
||
661 | add ecx, sizeof.IPv4_header |
||
662 | mov edi, AF_INET4 |
||
663 | call LOOP_output |
||
664 | jmp .continue |
||
665 | |||
666 | |||
667 | |||
668 | |||
669 | ;------------------------------------------------------------------ |
||
670 | ; |
||
671 | ; IPv4_output_raw |
||
672 | ; |
||
673 | ; IN: eax = socket ptr |
||
674 | ; ecx = data length |
||
675 | ; esi = data ptr |
||
676 | ; |
||
677 | ; OUT: / |
||
678 | ; |
||
679 | ;------------------------------------------------------------------ |
||
680 | align 4 |
||
681 | IPv4_output_raw: |
||
682 | |||
683 | DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax |
||
684 | |||
685 | cmp ecx, 1480 ;;;;; FIXME |
||
686 | ja .too_large |
||
687 | |||
688 | sub esp, 8 |
||
689 | push esi eax |
||
690 | |||
691 | call IPv4_route |
||
692 | call ARP_IP_to_MAC |
||
693 | |||
694 | test eax, 0xffff0000 ; error bits |
||
695 | jnz .arp_error |
||
696 | |||
697 | push ebx ; push the mac |
||
698 | push ax |
||
699 | |||
700 | inc [IPv4_packets_tx + 4*edi] |
||
701 | mov ebx, [NET_DRV_LIST + 4*edi] |
||
702 | lea eax, [ebx + ETH_DEVICE.mac] |
||
703 | mov edx, esp |
||
704 | mov ecx, [esp + 6 + 4] |
||
705 | add ecx, sizeof.IPv4_header |
||
706 | mov di, ETHER_PROTO_IPv4 |
||
707 | call ETH_output |
||
708 | jz .error |
||
709 | |||
710 | add esp, 6 ; pop the mac |
||
711 | |||
712 | mov dword[esp+4+4], edx |
||
713 | mov dword[esp+4+4+4], eax |
||
714 | |||
715 | pop eax esi |
||
716 | ;; todo: check socket options if we should add header, or just compute checksum |
||
717 | |||
718 | push edi ecx |
||
719 | rep movsb |
||
720 | pop ecx edi |
||
721 | |||
722 | ; [edi + IPv4_header.VersionAndIHL] ; IPv4, normal length (no Optional header) |
||
723 | ; [edi + IPv4_header.TypeOfService] ; nothing special, just plain ip packet |
||
724 | ; [edi + IPv4_header.TotalLength] |
||
725 | ; [edi + IPv4_header.TotalLength] ; internet byte order |
||
726 | ; [edi + IPv4_header.FlagsAndFragmentOffset] |
||
727 | |||
728 | mov [edi + IPv4_header.HeaderChecksum], 0 |
||
729 | |||
730 | ; [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
||
731 | ; [edi + IPv4_header.Protocol] |
||
732 | ; [edi + IPv4_header.Identification] ; fragment id |
||
733 | ; [edi + IPv4_header.SourceAddress] |
||
734 | ; [edi + IPv4_header.DestinationAddress] |
||
735 | |||
736 | IPv4_checksum edi ;;;; todo: checksum for IP packet with options! |
||
737 | add edi, sizeof.IPv4_header |
||
738 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output_raw: device=%x\n", ebx |
||
739 | call [ebx + NET_DEVICE.transmit] |
||
740 | ret |
||
741 | |||
742 | .error: |
||
743 | add esp, 6 |
||
744 | .arp_error: |
||
745 | add esp, 8+4+4 |
||
746 | .too_large: |
||
747 | DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output_raw: Failed\n" |
||
748 | sub edi, edi |
||
749 | ret |
||
750 | |||
751 | |||
752 | ;-------------------------------------------------------- |
||
753 | ; |
||
754 | ; |
||
755 | ; IN: dword [esp] = pointer to buffer containing ipv4 packet to be fragmented |
||
756 | ; dword [esp+4] = buffer size |
||
757 | ; esi = pointer to ip header in that buffer |
||
758 | ; ecx = max size of fragments |
||
759 | ; |
||
760 | ; OUT: / |
||
761 | ; |
||
762 | ;-------------------------------------------------------- |
||
763 | |||
764 | align 4 |
||
765 | IPv4_fragment: |
||
766 | |||
767 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_fragment\n" |
||
768 | |||
769 | and ecx, not 111b ; align 4 |
||
770 | |||
771 | cmp ecx, sizeof.IPv4_header + 8 ; must be able to put at least 8 bytes |
||
772 | jb .err2 |
||
773 | |||
774 | push esi ecx |
||
775 | mov eax, [esi + IPv4_header.DestinationAddress] |
||
776 | call ARP_IP_to_MAC |
||
777 | pop ecx esi |
||
778 | cmp eax, -1 |
||
779 | jz .err2 |
||
780 | |||
781 | push ebx |
||
782 | push ax |
||
783 | |||
784 | mov ebx, [NET_DRV_LIST] |
||
785 | lea eax, [ebx + ETH_DEVICE.mac] |
||
786 | push eax |
||
787 | |||
788 | |||
789 | push esi ; ptr to ip header |
||
790 | sub ecx, sizeof.IPv4_header ; substract header size |
||
791 | push ecx ; max data size |
||
792 | push dword 0 ; offset |
||
793 | |||
794 | .new_fragment: |
||
795 | DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: new fragment" |
||
796 | |||
797 | |||
798 | mov eax, [esp + 3*4] |
||
799 | lea ebx, [esp + 4*4] |
||
800 | mov di , ETHER_PROTO_IPv4 |
||
801 | call ETH_output |
||
802 | |||
803 | cmp edi, -1 |
||
804 | jz .err |
||
805 | |||
806 | ; copy header |
||
807 | mov esi, [esp + 2*4] |
||
808 | mov ecx, 5 ; 5 dwords: TODO: use IHL field of the header! |
||
809 | rep movsd |
||
810 | |||
811 | ; copy data |
||
812 | mov esi, [esp + 2*4] |
||
813 | add esi, sizeof.IPv4_header |
||
814 | add esi, [esp] ; offset |
||
815 | |||
816 | mov ecx, [esp + 1*4] |
||
817 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_fragment: copying %u bytes\n", ecx |
||
818 | rep movsb |
||
819 | |||
820 | ; now, correct header |
||
821 | mov ecx, [esp + 1*4] |
||
822 | add ecx, sizeof.IPv4_header |
||
823 | xchg cl, ch |
||
824 | mov [edi + IPv4_header.TotalLength], cx |
||
825 | |||
826 | mov ecx, [esp] ; offset |
||
827 | xchg cl, ch |
||
828 | |||
829 | ; cmp dword[esp + 4*4], 0 ; last fragment?;<<<<<< |
||
830 | ; je .last_fragment |
||
831 | or cx, 1 shl 2 ; more fragments |
||
832 | ; .last_fragment: |
||
833 | mov [edi + IPv4_header.FlagsAndFragmentOffset], cx |
||
834 | |||
835 | mov [edi + IPv4_header.HeaderChecksum], 0 |
||
836 | |||
837 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< send the packet |
||
838 | mov ecx, [esp + 1*4] |
||
839 | |||
840 | push edx eax |
||
841 | IPv4_checksum edi |
||
842 | |||
843 | call [ebx + NET_DEVICE.transmit] |
||
844 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
||
845 | |||
846 | mov ecx, [esp+4] |
||
847 | add [esp], ecx |
||
848 | |||
849 | mov ecx, [esp+3*4+6+4] ; ptr to begin of buff |
||
850 | add ecx, [esp+3*4+6+4+4] ; buff size |
||
851 | sub ecx, [esp+2*4] ; ptr to ip header |
||
852 | add ecx, [esp] ; offset |
||
853 | |||
854 | DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: %u bytes remaining\n", ecx |
||
855 | |||
856 | cmp ecx, [esp+1*4] |
||
857 | jae .new_fragment |
||
858 | |||
859 | mov [esp+4], ecx ; set fragment size to remaining packet size |
||
860 | jmp .new_fragment |
||
861 | |||
862 | .err: |
||
863 | DEBUGF DEBUG_NETWORK_ERROR, "Ipv4_fragment: failed\n" |
||
864 | .done: |
||
865 | add esp, 12 + 4 + 6 |
||
866 | .err2: |
||
867 | DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: dumping\n" |
||
868 | call NET_packet_free |
||
869 | add esp, 4 |
||
870 | |||
871 | ret |
||
872 | |||
873 | |||
874 | |||
875 | ;--------------------------------------------------------------------------- |
||
876 | ; |
||
877 | ; IPv4_route |
||
878 | ; |
||
879 | ; IN: eax = Destination IP |
||
880 | ; edx = Source IP |
||
881 | ; OUT: eax = Destination IP (or gateway IP) |
||
882 | ; edx = Source IP |
||
883 | ; edi = device number*4 |
||
884 | ; DESTROYED: |
||
885 | ; ecx |
||
886 | ; |
||
887 | ;--------------------------------------------------------------------------- |
||
888 | align 4 |
||
889 | IPv4_route: ; TODO: return error if no valid route found |
||
890 | |||
891 | cmp eax, 0xffffffff |
||
892 | je .broadcast |
||
893 | |||
894 | xor edi, edi |
||
895 | .loop: |
||
896 | mov ebx, [IP_LIST + edi] |
||
897 | and ebx, [SUBNET_LIST + edi] |
||
898 | jz .next |
||
899 | mov ecx, eax |
||
900 | and ecx, [SUBNET_LIST + edi] |
||
901 | cmp ebx, ecx |
||
902 | je .got_it |
||
903 | .next: |
||
904 | add edi, 4 |
||
905 | cmp edi, 4*NET_DEVICES_MAX |
||
906 | jb .loop |
||
907 | |||
908 | mov eax, [GATEWAY_LIST + 4] ; TODO: let user (or a user space daemon) configure default route |
||
909 | .broadcast: |
||
910 | mov edi, 4 ; TODO: same as above |
||
911 | .got_it: |
||
912 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_route: %u\n", edi |
||
913 | test edx, edx |
||
914 | jnz @f |
||
915 | mov edx, [IP_LIST + edi] |
||
916 | @@: |
||
917 | |||
918 | ret |
||
919 | |||
920 | |||
921 | |||
922 | ;--------------------------------------------------------------------------- |
||
923 | ; |
||
924 | ; IPv4_get_frgmnt_num |
||
925 | ; |
||
926 | ; IN: / |
||
927 | ; OUT: fragment number in ax |
||
928 | ; |
||
929 | ;--------------------------------------------------------------------------- |
||
930 | align 4 |
||
931 | IPv4_get_frgmnt_num: |
||
932 | xor ax, ax ;;; TODO: replace this with real code |
||
933 | |||
934 | ret |
||
935 | |||
936 | |||
937 | ;----------------------------------------------------------------- |
||
938 | ; |
||
939 | ; IPv4_connect |
||
940 | ; |
||
941 | ; IN: eax = socket pointer |
||
942 | ; OUT: eax = 0 ok / -1 error |
||
943 | ; ebx = error code |
||
944 | ; |
||
945 | ;------------------------- |
||
946 | align 4 |
||
947 | IPv4_connect: |
||
948 | |||
949 | push eax edx |
||
950 | lea ecx, [eax + SOCKET.mutex] |
||
951 | call mutex_lock |
||
952 | pop edx eax |
||
953 | |||
954 | ; Fill in local IP |
||
955 | cmp [eax + IP_SOCKET.LocalIP], 0 |
||
956 | jne @f |
||
957 | push [IP_LIST + 4] ; FIXME: use correct local IP |
||
958 | pop [eax + IP_SOCKET.LocalIP] |
||
959 | |||
960 | ; Fill in remote IP |
||
961 | pushd [edx + 4] |
||
962 | pop [eax + IP_SOCKET.RemoteIP] |
||
963 | |||
964 | ; Set up data receiving queue |
||
965 | push eax |
||
966 | init_queue (eax + SOCKET_QUEUE_LOCATION) |
||
967 | pop eax |
||
968 | |||
969 | lea ecx, [eax + SOCKET.mutex] |
||
970 | call mutex_unlock |
||
971 | |||
972 | xor eax, eax |
||
973 | ret |
||
974 | |||
975 | |||
976 | ;--------------------------------------------------------------------------- |
||
977 | ; |
||
978 | ; IPv4_API |
||
979 | ; |
||
980 | ; This function is called by system function 75 |
||
981 | ; |
||
982 | ; IN: subfunction number in bl |
||
983 | ; device number in bh |
||
984 | ; ecx, edx, .. depends on subfunction |
||
985 | ; |
||
986 | ; OUT: |
||
987 | ; |
||
988 | ;--------------------------------------------------------------------------- |
||
989 | align 4 |
||
990 | IPv4_api: |
||
991 | |||
992 | movzx eax, bh |
||
993 | shl eax, 2 |
||
994 | |||
995 | and ebx, 0x000000ff |
||
996 | cmp ebx, .number |
||
997 | ja .error |
||
998 | jmp dword [.table + 4*ebx] |
||
999 | |||
1000 | .table: |
||
1001 | dd .packets_tx ; 0 |
||
1002 | dd .packets_rx ; 1 |
||
1003 | dd .read_ip ; 2 |
||
1004 | dd .write_ip ; 3 |
||
1005 | dd .read_dns ; 4 |
||
1006 | dd .write_dns ; 5 |
||
1007 | dd .read_subnet ; 6 |
||
1008 | dd .write_subnet ; 7 |
||
1009 | dd .read_gateway ; 8 |
||
1010 | dd .write_gateway ; 9 |
||
1011 | .number = ($ - .table) / 4 - 1 |
||
1012 | |||
1013 | .error: |
||
1014 | mov eax, -1 |
||
1015 | ret |
||
1016 | |||
1017 | .packets_tx: |
||
1018 | mov eax, [IPv4_packets_tx + eax] |
||
1019 | ret |
||
1020 | |||
1021 | .packets_rx: |
||
1022 | mov eax, [IPv4_packets_rx + eax] |
||
1023 | ret |
||
1024 | |||
1025 | .read_ip: |
||
1026 | mov eax, [IP_LIST + eax] |
||
1027 | ret |
||
1028 | |||
1029 | .write_ip: |
||
1030 | mov [IP_LIST + eax], ecx |
||
1031 | mov edi, eax ; device number, we'll need it for ARP |
||
1032 | |||
1033 | ; pre-calculate the local broadcast address |
||
1034 | mov ebx, [SUBNET_LIST + eax] |
||
1035 | not ebx |
||
1036 | or ebx, ecx |
||
1037 | mov [BROADCAST_LIST + eax], ebx |
||
1038 | |||
1039 | mov ebx, [NET_DRV_LIST + eax] |
||
1040 | mov eax, [IP_LIST + eax] |
||
1041 | call ARP_output_request ; now send a gratuitous ARP |
||
1042 | |||
1043 | call NET_send_event |
||
1044 | xor eax, eax |
||
1045 | ret |
||
1046 | |||
1047 | .read_dns: |
||
1048 | mov eax, [DNS_LIST + eax] |
||
1049 | ret |
||
1050 | |||
1051 | .write_dns: |
||
1052 | mov [DNS_LIST + eax], ecx |
||
1053 | call NET_send_event |
||
1054 | xor eax, eax |
||
1055 | ret |
||
1056 | |||
1057 | .read_subnet: |
||
1058 | mov eax, [SUBNET_LIST + eax] |
||
1059 | ret |
||
1060 | |||
1061 | .write_subnet: |
||
1062 | mov [SUBNET_LIST + eax], ecx |
||
1063 | |||
1064 | ; pre-calculate the local broadcast address |
||
1065 | mov ebx, [IP_LIST + eax] |
||
1066 | not ecx |
||
1067 | or ecx, ebx |
||
1068 | mov [BROADCAST_LIST + eax], ecx |
||
1069 | |||
1070 | call NET_send_event |
||
1071 | xor eax, eax |
||
1072 | ret |
||
1073 | |||
1074 | .read_gateway: |
||
1075 | mov eax, [GATEWAY_LIST + eax] |
||
1076 | ret |
||
1077 | |||
1078 | .write_gateway: |
||
1079 | mov [GATEWAY_LIST + eax], ecx |
||
1080 | |||
1081 | call NET_send_event |
||
1082 | xor eax, eax |
||
1083 | ret |