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3545 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2012. 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 | MAX_FRAGMENTS = 64 |
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22 | |||
23 | struct IPv4_header |
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24 | |||
25 | VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits] |
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26 | 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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27 | TotalLength dw ? |
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28 | Identification dw ? |
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29 | FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15] |
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30 | TimeToLive db ? ; |
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31 | Protocol db ? |
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32 | HeaderChecksum dw ? |
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33 | SourceAddress dd ? |
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34 | DestinationAddress dd ? |
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35 | |||
36 | ends |
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37 | |||
38 | struct FRAGMENT_slot |
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39 | |||
40 | ttl dw ? ; Time to live for this entry, 0 for empty slot's |
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41 | id dw ? ; Identification field from IP header |
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42 | SrcIP dd ? ; .. from IP header |
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43 | DstIP dd ? ; .. from IP header |
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44 | ptr dd ? ; Pointer to first packet |
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45 | |||
46 | ends |
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47 | |||
48 | struct FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets |
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49 | |||
50 | PrevPtr dd ? ; Pointer to previous fragment entry (-1 for first packet) |
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51 | NextPtr dd ? ; Pointer to next fragment entry (-1 for last packet) |
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52 | Owner dd ? ; Pointer to structure of driver |
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53 | rb 2 ; to match ethernet header size ;;; FIXME |
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54 | ; Ip header begins here (we will need the IP header to re-construct the complete packet) |
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55 | ends |
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56 | |||
57 | |||
58 | align 4 |
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59 | uglobal |
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60 | |||
61 | IP_LIST rd MAX_NET_DEVICES |
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62 | SUBNET_LIST rd MAX_NET_DEVICES |
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63 | DNS_LIST rd MAX_NET_DEVICES |
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64 | GATEWAY_LIST rd MAX_NET_DEVICES |
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65 | BROADCAST_LIST rd MAX_NET_DEVICES |
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66 | |||
67 | IP_packets_tx rd MAX_NET_DEVICES |
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68 | IP_packets_rx rd MAX_NET_DEVICES |
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69 | IP_packets_dumped rd MAX_NET_DEVICES |
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70 | |||
71 | FRAGMENT_LIST rb MAX_FRAGMENTS * sizeof.FRAGMENT_slot |
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72 | endg |
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73 | |||
74 | |||
75 | ;----------------------------------------------------------------- |
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76 | ; |
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77 | ; IPv4_init |
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78 | ; |
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79 | ; This function resets all IP variables |
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80 | ; |
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81 | ;----------------------------------------------------------------- |
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82 | macro IPv4_init { |
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83 | |||
84 | xor eax, eax |
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85 | mov edi, IP_LIST |
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86 | mov ecx, 7*MAX_NET_DEVICES + (sizeof.FRAGMENT_slot*MAX_FRAGMENTS)/4 |
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87 | rep stosd |
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88 | |||
89 | } |
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90 | |||
91 | |||
92 | ;----------------------------------------------------------------- |
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93 | ; |
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94 | ; Decrease TimeToLive of all fragment slots |
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95 | ; |
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96 | ;----------------------------------------------------------------- |
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97 | macro IPv4_decrease_fragment_ttls { |
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98 | |||
99 | local .loop, .next |
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100 | |||
101 | mov esi, FRAGMENT_LIST |
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102 | mov ecx, MAX_FRAGMENTS |
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103 | .loop: |
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104 | cmp [esi + FRAGMENT_slot.ttl], 0 |
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105 | je .next |
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106 | dec [esi + FRAGMENT_slot.ttl] |
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107 | jz .died |
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108 | .next: |
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109 | add esi, sizeof.FRAGMENT_slot |
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110 | dec ecx |
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111 | jnz .loop |
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112 | jmp .done |
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113 | |||
114 | .died: |
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3556 | hidnplayr | 115 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4 Fragment slot timed-out!\n" |
3545 | hidnplayr | 116 | ;;; TODO: clear all entry's of timed-out slot |
117 | jmp .next |
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118 | |||
119 | .done: |
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120 | } |
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121 | |||
122 | |||
123 | |||
124 | macro IPv4_checksum ptr { |
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125 | |||
126 | ; This is the fast procedure to create or check an IP header without options |
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127 | ; To create a new checksum, the checksum field must be set to 0 before computation |
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128 | ; 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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129 | |||
130 | push ebx |
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131 | xor ebx, ebx |
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132 | add bl, [ptr+1] |
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133 | adc bh, [ptr+0] |
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134 | |||
135 | adc bl, [ptr+3] |
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136 | adc bh, [ptr+2] |
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137 | |||
138 | adc bl, [ptr+5] |
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139 | adc bh, [ptr+4] |
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140 | |||
141 | adc bl, [ptr+7] |
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142 | adc bh, [ptr+6] |
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143 | |||
144 | adc bl, [ptr+9] |
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145 | adc bh, [ptr+8] |
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146 | |||
147 | ; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation |
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148 | |||
149 | adc bl, [ptr+13] |
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150 | adc bh, [ptr+12] |
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151 | |||
152 | adc bl, [ptr+15] |
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153 | adc bh, [ptr+14] |
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154 | |||
155 | adc bl, [ptr+17] |
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156 | adc bh, [ptr+16] |
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157 | |||
158 | adc bl, [ptr+19] |
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159 | adc bh, [ptr+18] |
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160 | |||
161 | adc ebx, 0 |
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162 | |||
163 | push ecx |
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164 | mov ecx, ebx |
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165 | shr ecx, 16 |
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166 | and ebx, 0xffff |
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167 | add ebx, ecx |
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168 | |||
169 | mov ecx, ebx |
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170 | shr ecx, 16 |
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171 | add ebx, ecx |
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172 | |||
173 | not bx |
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174 | jnz .not_zero |
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175 | dec bx |
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176 | .not_zero: |
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177 | xchg bl, bh |
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178 | pop ecx |
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179 | |||
180 | neg word [ptr+10] ; zero will stay zero so we just get the checksum |
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181 | add word [ptr+10], bx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :) |
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182 | pop ebx |
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183 | |||
184 | } |
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185 | |||
186 | |||
187 | |||
188 | ;----------------------------------------------------------------- |
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189 | ; |
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190 | ; IPv4_input: |
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191 | ; |
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192 | ; Will check if IPv4 Packet isnt damaged |
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193 | ; and call appropriate handler. (TCP/UDP/ICMP/..) |
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194 | ; |
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195 | ; It will also re-construct fragmented packets |
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196 | ; |
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197 | ; IN: Pointer to buffer in [esp] |
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198 | ; size of buffer in [esp+4] |
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199 | ; pointer to device struct in ebx |
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200 | ; pointer to IPv4 header in edx |
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201 | ; size of IPv4 packet in ecx |
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202 | ; OUT: / |
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203 | ; |
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204 | ;----------------------------------------------------------------- |
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205 | align 4 |
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206 | IPv4_input: ; TODO: add IPv4 raw sockets support |
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207 | |||
3556 | hidnplayr | 208 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input, packet from: %u.%u.%u.%u ",\ |
3545 | hidnplayr | 209 | [edx + IPv4_header.SourceAddress + 0]:1,[edx + IPv4_header.SourceAddress + 1]:1,\ |
210 | [edx + IPv4_header.SourceAddress + 2]:1,[edx + IPv4_header.SourceAddress + 3]:1 |
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3556 | hidnplayr | 211 | DEBUGF DEBUG_NETWORK_VERBOSE, "to: %u.%u.%u.%u\n",\ |
3545 | hidnplayr | 212 | [edx + IPv4_header.DestinationAddress + 0]:1,[edx + IPv4_header.DestinationAddress + 1]:1,\ |
213 | [edx + IPv4_header.DestinationAddress + 2]:1,[edx + IPv4_header.DestinationAddress + 3]:1 |
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214 | |||
215 | ;------------------------------- |
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216 | ; re-calculate the checksum |
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217 | |||
218 | IPv4_checksum edx |
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219 | jnz .dump ; if checksum isn't valid then dump packet |
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220 | |||
3556 | hidnplayr | 221 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Checksum ok\n" |
3545 | hidnplayr | 222 | |
223 | ;----------------------------------- |
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224 | ; Check if destination IP is correct |
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225 | |||
226 | call NET_ptr_to_num |
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227 | shl edi, 2 |
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228 | |||
229 | ; check if it matches local ip (Using RFC1122 strong end system model) |
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230 | |||
231 | mov eax, [edx + IPv4_header.DestinationAddress] |
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232 | cmp eax, [IP_LIST + edi] |
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233 | je .ip_ok |
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234 | |||
235 | ; check for broadcast (IP or (not SUBNET)) |
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236 | |||
237 | cmp eax, [BROADCAST_LIST + edi] |
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238 | je .ip_ok |
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239 | |||
240 | ; or a special broadcast (255.255.255.255) |
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241 | |||
242 | cmp eax, 0xffffffff |
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243 | je .ip_ok |
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244 | |||
245 | ; maybe it's a multicast (224.0.0.0/4) |
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246 | |||
247 | and eax, 0x0fffffff |
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248 | cmp eax, 224 |
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249 | je .ip_ok |
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250 | |||
251 | ; or a loopback address (127.0.0.0/8) |
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252 | |||
253 | and eax, 0x00ffffff |
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254 | cmp eax, 127 |
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255 | je .ip_ok |
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256 | |||
257 | ; or it's just not meant for us.. :( |
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258 | |||
3556 | hidnplayr | 259 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Destination address does not match!\n" |
3545 | hidnplayr | 260 | jmp .dump |
261 | |||
262 | ;------------------------ |
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263 | ; Now we can update stats |
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264 | |||
265 | .ip_ok: |
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266 | inc [IP_packets_rx + edi] |
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267 | |||
268 | ;---------------------------------- |
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269 | ; Check if the packet is fragmented |
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270 | |||
271 | test [edx + IPv4_header.FlagsAndFragmentOffset], 1 shl 5 ; Is 'more fragments' flag set ? |
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272 | jnz .has_fragments ; If so, we definately have a fragmented packet |
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273 | |||
274 | 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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275 | jnz .is_last_fragment |
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276 | |||
277 | ;------------------------------------------------------------------- |
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278 | ; No, it's just a regular IP packet, pass it to the higher protocols |
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279 | |||
280 | .handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed |
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281 | |||
282 | movzx esi, [edx + IPv4_header.VersionAndIHL] ; Calculate Header length by using IHL field |
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283 | and esi, 0x0000000f ; |
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284 | shl esi, 2 ; |
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285 | |||
286 | movzx ecx, [edx + IPv4_header.TotalLength] ; Calculate length of encapsulated Packet |
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287 | xchg cl, ch ; |
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288 | sub ecx, esi ; |
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289 | |||
290 | lea edi, [edx + IPv4_header.SourceAddress] ; make edi ptr to source and dest IPv4 address |
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291 | mov al, [edx + IPv4_header.Protocol] |
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292 | add esi, edx ; make esi ptr to data |
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293 | |||
294 | cmp al, IP_PROTO_TCP |
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295 | je TCP_input |
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296 | |||
297 | cmp al, IP_PROTO_UDP |
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298 | je UDP_input |
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299 | |||
300 | cmp al, IP_PROTO_ICMP |
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301 | je ICMP_input |
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302 | |||
3556 | hidnplayr | 303 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: unknown protocol %u\n", al |
3545 | hidnplayr | 304 | |
305 | .dump: |
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3556 | hidnplayr | 306 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: dumping\n" |
3545 | hidnplayr | 307 | inc [IP_packets_dumped] ; FIXME: use correct interface |
308 | call kernel_free |
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309 | add esp, 4 ; pop (balance stack) |
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310 | ret |
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311 | |||
312 | |||
313 | ;--------------------------- |
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314 | ; Fragmented packet handler |
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315 | |||
316 | |||
317 | .has_fragments: |
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318 | movzx eax, [edx + IPv4_header.FlagsAndFragmentOffset] |
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319 | xchg al, ah |
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320 | shl ax, 3 |
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321 | |||
3556 | hidnplayr | 322 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: fragmented packet offset=%u id=%x\n", ax, [edx + IPv4_header.Identification]:4 |
3545 | hidnplayr | 323 | |
324 | test ax, ax ; Is this the first packet of the fragment? |
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325 | jz .is_first_fragment |
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326 | |||
327 | |||
328 | ;------------------------------------------------------- |
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329 | ; We have a fragmented IP packet, but it's not the first |
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330 | |||
3556 | hidnplayr | 331 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Middle fragment packet received!\n" |
3545 | hidnplayr | 332 | |
333 | call IPv4_find_fragment_slot |
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334 | cmp esi, -1 |
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335 | je .dump |
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336 | |||
337 | mov [esi + FRAGMENT_slot.ttl], 15 ; Reset the ttl |
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338 | mov esi, [esi + FRAGMENT_slot.ptr] |
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339 | or edi, -1 |
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340 | .find_last_entry: ; The following routine will try to find the last entry |
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341 | cmp edi, [esi + FRAGMENT_entry.PrevPtr] |
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342 | jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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343 | mov edi, esi |
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344 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
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345 | cmp esi, -1 |
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346 | jne .find_last_entry |
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347 | ; We found the last entry (pointer is now in edi) |
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348 | ; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure |
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349 | |||
350 | pop eax ; pointer to packet |
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351 | mov [edi + FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry |
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352 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
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353 | mov [eax + FRAGMENT_entry.PrevPtr], edi |
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354 | mov [eax + FRAGMENT_entry.Owner], ebx |
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355 | |||
356 | add esp, 4 |
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357 | ret |
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358 | |||
359 | |||
360 | ;------------------------------------ |
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361 | ; We have received the first fragment |
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362 | |||
363 | .is_first_fragment: |
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3556 | hidnplayr | 364 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: First fragment packet received!\n" |
3545 | hidnplayr | 365 | ; try to locate a free slot.. |
366 | mov ecx, MAX_FRAGMENTS |
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367 | mov esi, FRAGMENT_LIST |
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368 | .find_free_slot: |
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369 | cmp word [esi + FRAGMENT_slot.ttl], 0 |
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370 | je .found_free_slot |
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371 | add esi, sizeof.FRAGMENT_slot |
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372 | loop .find_free_slot |
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373 | jmp .dump ; If no free slot was found, dump the packet |
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374 | |||
375 | .found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure |
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376 | mov [esi + FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl |
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377 | mov ax, [edx + IPv4_header.Identification] |
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378 | mov [esi + FRAGMENT_slot.id], ax |
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379 | mov eax, [edx + IPv4_header.SourceAddress] |
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380 | mov [esi + FRAGMENT_slot.SrcIP], eax |
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381 | mov eax, [edx + IPv4_header.DestinationAddress] |
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382 | mov [esi + FRAGMENT_slot.DstIP], eax |
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383 | pop eax |
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384 | mov [esi + FRAGMENT_slot.ptr], eax |
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385 | ; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure |
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386 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
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387 | mov [eax + FRAGMENT_entry.PrevPtr], -1 |
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388 | mov [eax + FRAGMENT_entry.Owner], ebx |
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389 | |||
390 | add esp, 4 ; balance stack and exit |
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391 | ret |
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392 | |||
393 | |||
394 | ;----------------------------------- |
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395 | ; We have received the last fragment |
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396 | |||
397 | .is_last_fragment: |
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3556 | hidnplayr | 398 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Last fragment packet received!\n" |
3545 | hidnplayr | 399 | |
400 | call IPv4_find_fragment_slot |
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401 | cmp esi, -1 |
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402 | je .dump |
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403 | |||
404 | 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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405 | push esi |
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406 | xor eax, eax |
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407 | or edi, -1 |
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408 | |||
409 | .count_bytes: |
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410 | cmp [esi + FRAGMENT_entry.PrevPtr], edi |
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411 | jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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412 | mov cx, [esi + sizeof.FRAGMENT_entry + IPv4_header.TotalLength] ; Add total length |
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413 | xchg cl, ch |
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3556 | hidnplayr | 414 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet size=%u\n", cx |
3545 | hidnplayr | 415 | add ax, cx |
416 | movzx cx, [esi + sizeof.FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Sub Header length |
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417 | and cx, 0x000F |
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418 | shl cx, 2 |
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3556 | hidnplayr | 419 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Header size=%u\n", cx |
3545 | hidnplayr | 420 | sub ax, cx |
421 | mov edi, esi |
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422 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
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423 | cmp esi, -1 |
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424 | jne .count_bytes |
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425 | |||
426 | mov esi, [esp+4] |
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427 | mov [edi + FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code |
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428 | mov [esi + FRAGMENT_entry.NextPtr], -1 |
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429 | mov [esi + FRAGMENT_entry.PrevPtr], edi |
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430 | mov [esi + FRAGMENT_entry.Owner], ebx |
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431 | |||
432 | mov cx, [edx + IPv4_header.TotalLength] ; Note: This time we dont substract Header length |
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433 | xchg cl, ch |
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3556 | hidnplayr | 434 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet size=%u\n", cx |
3545 | hidnplayr | 435 | add ax, cx |
3556 | hidnplayr | 436 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Total Received data size=%u\n", eax |
3545 | hidnplayr | 437 | |
438 | push eax |
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439 | mov ax, [edx + IPv4_header.FlagsAndFragmentOffset] |
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440 | xchg al, ah |
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441 | shl ax, 3 |
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442 | add cx, ax |
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443 | pop eax |
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3556 | hidnplayr | 444 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Total Fragment size=%u\n", ecx |
3545 | hidnplayr | 445 | |
446 | cmp ax, cx |
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447 | jne .destroy_slot_pop |
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448 | |||
449 | push eax |
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450 | push eax |
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451 | call kernel_alloc |
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452 | test eax, eax |
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453 | je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot |
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454 | mov edx, [esp+4] ; Get pointer to first fragment entry back in edx |
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455 | |||
456 | .rebuild_packet_loop: |
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457 | movzx ecx, [edx + sizeof.FRAGMENT_entry + IPv4_header.FlagsAndFragmentOffset] ; Calculate the fragment offset |
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458 | xchg cl, ch ; intel byte order |
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459 | shl cx, 3 ; multiply by 8 and clear first 3 bits |
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3556 | hidnplayr | 460 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Fragment offset=%u\n", cx |
3545 | hidnplayr | 461 | |
462 | lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment |
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463 | movzx ebx, [edx + sizeof.FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment |
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464 | and bx, 0x000F ; |
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465 | shl bx, 2 ; |
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466 | |||
467 | lea esi, [edx + sizeof.FRAGMENT_entry] ; Set esi to the correct begin of fragment |
||
468 | movzx ecx, [edx + sizeof.FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment |
||
469 | xchg cl, ch ; intel byte order |
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470 | |||
471 | cmp edi, eax ; Is this packet the first fragment ? |
||
472 | je .first_fragment |
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473 | sub cx, bx ; If not, dont copy the header |
||
474 | add esi, ebx ; |
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475 | .first_fragment: |
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476 | |||
477 | push cx ; First copy dword-wise, then byte-wise |
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478 | shr cx, 2 ; |
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479 | rep movsd ; |
||
480 | pop cx ; |
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481 | and cx, 3 ; |
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482 | rep movsb ; |
||
483 | |||
484 | push eax |
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485 | push edx ; Push pointer to fragment onto stack |
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486 | mov ebx, [edx + FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet |
||
487 | mov edx, [edx + FRAGMENT_entry.NextPtr] ; Set edx to the next pointer |
||
488 | call kernel_free ; free the previous fragment buffer (this uses the value from stack) |
||
489 | pop eax |
||
490 | cmp edx, -1 ; Check if it is last fragment in chain |
||
491 | jne .rebuild_packet_loop |
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492 | |||
493 | pop ecx |
||
494 | xchg cl, ch |
||
495 | mov edx, eax |
||
496 | mov [edx + IPv4_header.TotalLength], cx |
||
497 | add esp, 8 |
||
498 | xchg cl, ch |
||
499 | push ecx |
||
500 | |||
501 | push eax |
||
502 | jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr |
||
503 | |||
504 | .destroy_slot_pop: |
||
505 | add esp, 4 |
||
506 | .destroy_slot: |
||
3556 | hidnplayr | 507 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Destroy fragment slot!\n" |
3545 | hidnplayr | 508 | ; TODO! |
509 | jmp .dump |
||
510 | |||
511 | |||
512 | |||
513 | |||
514 | |||
515 | ;----------------------------------------------------------------- |
||
516 | ; |
||
517 | ; find fragment slot |
||
518 | ; |
||
519 | ; IN: pointer to fragmented packet in edx |
||
520 | ; OUT: pointer to slot in esi, -1 on error |
||
521 | ; |
||
522 | ;----------------------------------------------------------------- |
||
523 | align 4 |
||
524 | IPv4_find_fragment_slot: |
||
525 | |||
526 | ;;; TODO: the RFC says we should check protocol number too |
||
527 | |||
528 | push eax ebx ecx edx |
||
529 | mov ax, [edx + IPv4_header.Identification] |
||
530 | mov ecx, MAX_FRAGMENTS |
||
531 | mov esi, FRAGMENT_LIST |
||
532 | mov ebx, [edx + IPv4_header.SourceAddress] |
||
533 | mov edx, [edx + IPv4_header.DestinationAddress] |
||
534 | .find_slot: |
||
535 | cmp [esi + FRAGMENT_slot.id], ax |
||
536 | jne .try_next |
||
537 | cmp [esi + FRAGMENT_slot.SrcIP], ebx |
||
538 | jne .try_next |
||
539 | cmp [esi + FRAGMENT_slot.DstIP], edx |
||
540 | je .found_slot |
||
541 | .try_next: |
||
542 | add esi, sizeof.FRAGMENT_slot |
||
543 | loop .find_slot |
||
544 | |||
545 | or esi, -1 |
||
546 | .found_slot: |
||
547 | pop edx ecx ebx eax |
||
548 | ret |
||
549 | |||
550 | |||
551 | ;------------------------------------------------------------------ |
||
552 | ; |
||
553 | ; IPv4_output |
||
554 | ; |
||
555 | ; IN: eax = dest ip |
||
556 | ; ebx = output device ptr/0 for automatic choice |
||
557 | ; ecx = data length |
||
558 | ; edx = source ip |
||
559 | ; di = TTL shl 8 + protocol |
||
560 | ; |
||
561 | ; OUT: eax = pointer to buffer start |
||
562 | ; ebx = pointer to device struct (needed for sending procedure) |
||
563 | ; ecx = unchanged (packet size of embedded data) |
||
564 | ; edx = size of complete buffer |
||
565 | ; edi = pointer to start of data (0 on error) |
||
566 | ; |
||
567 | ;------------------------------------------------------------------ |
||
568 | align 4 |
||
569 | IPv4_output: |
||
570 | |||
3556 | hidnplayr | 571 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: size=%u\n", ecx |
3545 | hidnplayr | 572 | |
573 | cmp ecx, 65500 ; Max IPv4 packet size |
||
574 | ja .too_large |
||
575 | |||
576 | push ecx eax edx di |
||
577 | |||
578 | cmp eax, 1 shl 24 + 127 |
||
579 | je .loopback |
||
580 | |||
581 | call IPv4_route ; outputs device number in edi, dest ip in eax |
||
582 | call ARP_IP_to_MAC |
||
583 | test eax, 0xffff0000 ; error bits |
||
584 | jnz .arp_error |
||
585 | push ebx ; push the mac onto the stack |
||
586 | push ax |
||
587 | |||
588 | inc [IP_packets_tx + edi] ; update stats |
||
589 | |||
590 | mov ebx, [NET_DRV_LIST + edi] |
||
591 | lea eax, [ebx + ETH_DEVICE.mac] |
||
592 | mov edx, esp |
||
593 | mov ecx, [esp + 10 + 6] |
||
594 | add ecx, sizeof.IPv4_header |
||
595 | mov di, ETHER_IPv4 |
||
596 | call ETH_output |
||
597 | jz .eth_error |
||
598 | add esp, 6 ; pop the mac out of the stack |
||
599 | |||
600 | .continue: |
||
601 | xchg cl, ch ; internet byte order |
||
602 | mov [edi + IPv4_header.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header) |
||
603 | mov [edi + IPv4_header.TypeOfService], 0 ; nothing special, just plain ip packet |
||
604 | mov [edi + IPv4_header.TotalLength], cx |
||
605 | mov [edi + IPv4_header.Identification], 0 ; fragment id: FIXME |
||
606 | mov [edi + IPv4_header.FlagsAndFragmentOffset], 0 |
||
607 | pop word [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
||
608 | ; [edi + IPv4_header.Protocol] |
||
609 | mov [edi + IPv4_header.HeaderChecksum], 0 |
||
610 | popd [edi + IPv4_header.SourceAddress] |
||
611 | popd [edi + IPv4_header.DestinationAddress] |
||
612 | |||
613 | pop ecx |
||
614 | |||
615 | IPv4_checksum edi |
||
616 | add edi, sizeof.IPv4_header |
||
3556 | hidnplayr | 617 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: success!\n" |
3545 | hidnplayr | 618 | ret |
619 | |||
620 | .eth_error: |
||
3556 | hidnplayr | 621 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: ethernet error\n" |
3545 | hidnplayr | 622 | add esp, 3*4+2+6 |
623 | xor edi, edi |
||
624 | ret |
||
625 | |||
626 | .arp_error: |
||
3556 | hidnplayr | 627 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: ARP error=%x\n", eax |
3545 | hidnplayr | 628 | add esp, 3*4+2 |
629 | xor edi, edi |
||
630 | ret |
||
631 | |||
632 | .too_large: |
||
3556 | hidnplayr | 633 | DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: Packet too large!\n" |
3545 | hidnplayr | 634 | xor edi, edi |
635 | ret |
||
636 | |||
637 | .loopback: |
||
638 | mov dword [esp + 2], eax |
||
639 | add ecx, sizeof.IPv4_header |
||
640 | mov di, ETHER_IPv4 |
||
641 | call LOOP_output |
||
642 | jmp .continue |
||
643 | |||
644 | |||
645 | |||
646 | |||
647 | ;------------------------------------------------------------------ |
||
648 | ; |
||
649 | ; IPv4_output_raw |
||
650 | ; |
||
651 | ; IN: eax = socket ptr |
||
652 | ; ecx = data length |
||
653 | ; esi = data ptr |
||
654 | ; |
||
655 | ; OUT: / |
||
656 | ; |
||
657 | ;------------------------------------------------------------------ |
||
658 | align 4 |
||
659 | IPv4_output_raw: |
||
660 | |||
661 | DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax |
||
662 | |||
663 | cmp ecx, 1480 ;;;;; FIXME |
||
664 | ja .too_large |
||
665 | |||
666 | sub esp, 8 |
||
667 | push esi eax |
||
668 | |||
669 | call IPv4_route |
||
670 | call ARP_IP_to_MAC |
||
671 | |||
672 | test eax, 0xffff0000 ; error bits |
||
673 | jnz .arp_error |
||
674 | |||
675 | push ebx ; push the mac |
||
676 | push ax |
||
677 | |||
678 | inc [IP_packets_tx + edi] |
||
679 | mov ebx, [NET_DRV_LIST + edi] |
||
680 | lea eax, [ebx + ETH_DEVICE.mac] |
||
681 | mov edx, esp |
||
682 | mov ecx, [esp + 6 + 4] |
||
683 | add ecx, sizeof.IPv4_header |
||
684 | mov di, ETHER_IPv4 |
||
685 | call ETH_output |
||
686 | jz .error |
||
687 | |||
688 | add esp, 6 ; pop the mac |
||
689 | |||
690 | mov dword[esp+4+4], edx |
||
691 | mov dword[esp+4+4+4], eax |
||
692 | |||
693 | pop eax esi |
||
694 | ;; todo: check socket options if we should add header, or just compute checksum |
||
695 | |||
696 | push edi ecx |
||
697 | rep movsb |
||
698 | pop ecx edi |
||
699 | |||
700 | ; [edi + IPv4_header.VersionAndIHL] ; IPv4, normal length (no Optional header) |
||
701 | ; [edi + IPv4_header.TypeOfService] ; nothing special, just plain ip packet |
||
702 | ; [edi + IPv4_header.TotalLength] |
||
703 | ; [edi + IPv4_header.TotalLength] ; internet byte order |
||
704 | ; [edi + IPv4_header.FlagsAndFragmentOffset] |
||
705 | |||
706 | mov [edi + IPv4_header.HeaderChecksum], 0 |
||
707 | |||
708 | ; [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
||
709 | ; [edi + IPv4_header.Protocol] |
||
710 | ; [edi + IPv4_header.Identification] ; fragment id |
||
711 | ; [edi + IPv4_header.SourceAddress] |
||
712 | ; [edi + IPv4_header.DestinationAddress] |
||
713 | |||
714 | IPv4_checksum edi ;;;; todo: checksum for IP packet with options! |
||
715 | add edi, sizeof.IPv4_header |
||
3556 | hidnplayr | 716 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output_raw: device=%x\n", ebx |
3545 | hidnplayr | 717 | call [ebx + NET_DEVICE.transmit] |
718 | ret |
||
719 | |||
720 | .error: |
||
721 | add esp, 6 |
||
722 | .arp_error: |
||
723 | add esp, 8+4+4 |
||
724 | .too_large: |
||
3556 | hidnplayr | 725 | DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output_raw: Failed\n" |
3545 | hidnplayr | 726 | sub edi, edi |
727 | ret |
||
728 | |||
729 | |||
730 | ;-------------------------------------------------------- |
||
731 | ; |
||
732 | ; |
||
733 | ; IN: dword [esp] = pointer to buffer containing ipv4 packet to be fragmented |
||
734 | ; dword [esp+4] = buffer size |
||
735 | ; esi = pointer to ip header in that buffer |
||
736 | ; ecx = max size of fragments |
||
737 | ; |
||
738 | ; OUT: / |
||
739 | ; |
||
740 | ;-------------------------------------------------------- |
||
741 | |||
742 | align 4 |
||
743 | IPv4_fragment: |
||
744 | |||
3556 | hidnplayr | 745 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_fragment\n" |
3545 | hidnplayr | 746 | |
747 | and ecx, not 111b ; align 4 |
||
748 | |||
749 | cmp ecx, sizeof.IPv4_header + 8 ; must be able to put at least 8 bytes |
||
750 | jb .err2 |
||
751 | |||
752 | push esi ecx |
||
753 | mov eax, [esi + IPv4_header.DestinationAddress] |
||
754 | call ARP_IP_to_MAC |
||
755 | pop ecx esi |
||
756 | cmp eax, -1 |
||
757 | jz .err2 |
||
758 | |||
759 | push ebx |
||
760 | push ax |
||
761 | |||
762 | mov ebx, [NET_DRV_LIST] |
||
763 | lea eax, [ebx + ETH_DEVICE.mac] |
||
764 | push eax |
||
765 | |||
766 | |||
767 | push esi ; ptr to ip header |
||
768 | sub ecx, sizeof.IPv4_header ; substract header size |
||
769 | push ecx ; max data size |
||
770 | push dword 0 ; offset |
||
771 | |||
772 | .new_fragment: |
||
3556 | hidnplayr | 773 | DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: new fragment" |
3545 | hidnplayr | 774 | |
775 | |||
776 | mov eax, [esp + 3*4] |
||
777 | lea ebx, [esp + 4*4] |
||
778 | mov di , ETHER_IPv4 |
||
779 | call ETH_output |
||
780 | |||
781 | cmp edi, -1 |
||
782 | jz .err |
||
783 | |||
784 | ; copy header |
||
785 | mov esi, [esp + 2*4] |
||
786 | mov ecx, 5 ; 5 dwords: TODO: use IHL field of the header! |
||
787 | rep movsd |
||
788 | |||
789 | ; copy data |
||
790 | mov esi, [esp + 2*4] |
||
791 | add esi, sizeof.IPv4_header |
||
792 | add esi, [esp] ; offset |
||
793 | |||
794 | mov ecx, [esp + 1*4] |
||
3556 | hidnplayr | 795 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_fragment: copying %u bytes\n", ecx |
3545 | hidnplayr | 796 | rep movsb |
797 | |||
798 | ; now, correct header |
||
799 | mov ecx, [esp + 1*4] |
||
800 | add ecx, sizeof.IPv4_header |
||
801 | xchg cl, ch |
||
802 | mov [edi + IPv4_header.TotalLength], cx |
||
803 | |||
804 | mov ecx, [esp] ; offset |
||
805 | xchg cl, ch |
||
806 | |||
807 | ; cmp dword[esp + 4*4], 0 ; last fragment?;<<<<<< |
||
808 | ; je .last_fragment |
||
809 | or cx, 1 shl 2 ; more fragments |
||
810 | ; .last_fragment: |
||
811 | mov [edi + IPv4_header.FlagsAndFragmentOffset], cx |
||
812 | |||
813 | mov [edi + IPv4_header.HeaderChecksum], 0 |
||
814 | |||
815 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< send the packet |
||
816 | mov ecx, [esp + 1*4] |
||
817 | |||
818 | push edx eax |
||
819 | IPv4_checksum edi |
||
820 | |||
821 | call [ebx + NET_DEVICE.transmit] |
||
822 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
||
823 | |||
824 | mov ecx, [esp+4] |
||
825 | add [esp], ecx |
||
826 | |||
827 | mov ecx, [esp+3*4+6+4] ; ptr to begin of buff |
||
828 | add ecx, [esp+3*4+6+4+4] ; buff size |
||
829 | sub ecx, [esp+2*4] ; ptr to ip header |
||
830 | add ecx, [esp] ; offset |
||
831 | |||
3556 | hidnplayr | 832 | DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: %u bytes remaining\n", ecx |
3545 | hidnplayr | 833 | |
834 | cmp ecx, [esp+1*4] |
||
835 | jae .new_fragment |
||
836 | |||
837 | mov [esp+4], ecx ; set fragment size to remaining packet size |
||
838 | jmp .new_fragment |
||
839 | |||
840 | .err: |
||
3556 | hidnplayr | 841 | DEBUGF DEBUG_NETWORK_ERROR, "Ipv4_fragment: failed\n" |
3545 | hidnplayr | 842 | .done: |
843 | add esp, 12 + 4 + 6 |
||
844 | .err2: |
||
3556 | hidnplayr | 845 | DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: dumping\n" |
3545 | hidnplayr | 846 | call kernel_free |
847 | add esp, 4 |
||
848 | |||
849 | ret |
||
850 | |||
851 | |||
852 | |||
853 | ;--------------------------------------------------------------------------- |
||
854 | ; |
||
855 | ; IPv4_route |
||
856 | ; |
||
857 | ; IN: eax = Destination IP |
||
858 | ; OUT: edi = device id * 4 |
||
859 | ; eax = ip of gateway if nescessary, unchanged otherwise |
||
860 | ; |
||
861 | ;--------------------------------------------------------------------------- |
||
862 | align 4 |
||
863 | IPv4_route: |
||
864 | |||
865 | cmp eax, 0xffffffff |
||
866 | je .broadcast |
||
867 | |||
868 | xor edi, edi |
||
869 | mov ecx, MAX_NET_DEVICES |
||
870 | .loop: |
||
871 | mov ebx, [IP_LIST+edi] |
||
872 | and ebx, [SUBNET_LIST+edi] |
||
873 | jz .next |
||
874 | mov edx, eax |
||
875 | and edx, [SUBNET_LIST+edi] |
||
876 | |||
877 | cmp ebx, edx |
||
878 | je .found_it |
||
879 | .next: |
||
880 | add edi, 4 |
||
881 | dec ecx |
||
882 | jnz .loop |
||
883 | |||
884 | .invalid: |
||
885 | xor edi, edi ; if none found, use device 0 as default |
||
886 | mov eax, [GATEWAY_LIST] |
||
887 | |||
888 | .found_it: |
||
3556 | hidnplayr | 889 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_route: %u\n", edi |
3545 | hidnplayr | 890 | ret |
891 | |||
892 | .broadcast: |
||
893 | xor edi, edi |
||
894 | ret |
||
895 | |||
896 | |||
897 | |||
898 | ;--------------------------------------------------------------------------- |
||
899 | ; |
||
900 | ; IPv4_get_frgmnt_num |
||
901 | ; |
||
902 | ; IN: / |
||
903 | ; OUT: fragment number in ax |
||
904 | ; |
||
905 | ;--------------------------------------------------------------------------- |
||
906 | align 4 |
||
907 | IPv4_get_frgmnt_num: |
||
908 | xor ax, ax ;;; TODO: replace this with real code |
||
909 | |||
910 | ret |
||
911 | |||
912 | |||
913 | ;--------------------------------------------------------------------------- |
||
914 | ; |
||
915 | ; IPv4_API |
||
916 | ; |
||
917 | ; This function is called by system function 75 |
||
918 | ; |
||
919 | ; IN: subfunction number in bl |
||
920 | ; device number in bh |
||
921 | ; ecx, edx, .. depends on subfunction |
||
922 | ; |
||
923 | ; OUT: |
||
924 | ; |
||
925 | ;--------------------------------------------------------------------------- |
||
926 | align 4 |
||
927 | IPv4_api: |
||
928 | |||
929 | movzx eax, bh |
||
930 | shl eax, 2 |
||
931 | |||
932 | and ebx, 0x000000ff |
||
933 | cmp ebx, .number |
||
934 | ja .error |
||
935 | jmp dword [.table + 4*ebx] |
||
936 | |||
937 | .table: |
||
938 | dd .packets_tx ; 0 |
||
939 | dd .packets_rx ; 1 |
||
940 | dd .read_ip ; 2 |
||
941 | dd .write_ip ; 3 |
||
942 | dd .read_dns ; 4 |
||
943 | dd .write_dns ; 5 |
||
944 | dd .read_subnet ; 6 |
||
945 | dd .write_subnet ; 7 |
||
946 | dd .read_gateway ; 8 |
||
947 | dd .write_gateway ; 9 |
||
948 | .number = ($ - .table) / 4 - 1 |
||
949 | |||
950 | .error: |
||
951 | mov eax, -1 |
||
952 | ret |
||
953 | |||
954 | .packets_tx: |
||
955 | mov eax, [IP_packets_tx + eax] |
||
956 | ret |
||
957 | |||
958 | .packets_rx: |
||
959 | mov eax, [IP_packets_rx + eax] |
||
960 | ret |
||
961 | |||
962 | .read_ip: |
||
963 | mov eax, [IP_LIST + eax] |
||
964 | ret |
||
965 | |||
966 | .write_ip: |
||
967 | mov [IP_LIST + eax], ecx |
||
968 | mov edi, eax ; device number, we'll need it for ARP |
||
969 | |||
970 | ; pre-calculate the local broadcast address |
||
971 | mov ebx, [SUBNET_LIST + eax] |
||
972 | not ebx |
||
973 | or ebx, ecx |
||
974 | mov [BROADCAST_LIST + eax], ebx |
||
975 | |||
976 | mov eax, ecx |
||
977 | call ARP_output_request ; now send a gratuitous ARP |
||
978 | |||
979 | call NET_send_event |
||
980 | xor eax, eax |
||
981 | ret |
||
982 | |||
983 | .read_dns: |
||
984 | mov eax, [DNS_LIST + eax] |
||
985 | ret |
||
986 | |||
987 | .write_dns: |
||
988 | mov [DNS_LIST + eax], ecx |
||
989 | call NET_send_event |
||
990 | xor eax, eax |
||
991 | ret |
||
992 | |||
993 | .read_subnet: |
||
994 | mov eax, [SUBNET_LIST + eax] |
||
995 | ret |
||
996 | |||
997 | .write_subnet: |
||
998 | mov [SUBNET_LIST + eax], ecx |
||
999 | |||
1000 | ; pre-calculate the local broadcast address |
||
1001 | mov ebx, [IP_LIST + eax] |
||
1002 | not ecx |
||
1003 | or ecx, ebx |
||
1004 | mov [BROADCAST_LIST + eax], ecx |
||
1005 | |||
1006 | call NET_send_event |
||
1007 | xor eax, eax |
||
1008 | ret |
||
1009 | |||
1010 | .read_gateway: |
||
1011 | mov eax, [GATEWAY_LIST + eax] |
||
1012 | ret |
||
1013 | |||
1014 | .write_gateway: |
||
1015 | mov [GATEWAY_LIST + eax], ecx |
||
1016 | |||
1017 | call NET_send_event |
||
1018 | xor eax, eax |
||
1019 | ret |