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3545 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3861 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2013. All rights reserved. ;; |
3545 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
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 | |||
4053 | hidnplayr | 21 | IPv4_MAX_FRAGMENTS = 64 |
3545 | hidnplayr | 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 | |||
4052 | hidnplayr | 38 | struct IPv4_FRAGMENT_slot |
3545 | hidnplayr | 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 | |||
4052 | hidnplayr | 48 | struct IPv4_FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets |
3545 | hidnplayr | 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 | |||
3698 | hidnplayr | 58 | uglobal |
3545 | hidnplayr | 59 | align 4 |
60 | |||
3600 | hidnplayr | 61 | IP_LIST rd NET_DEVICES_MAX |
62 | SUBNET_LIST rd NET_DEVICES_MAX |
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63 | DNS_LIST rd NET_DEVICES_MAX |
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64 | GATEWAY_LIST rd NET_DEVICES_MAX |
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65 | BROADCAST_LIST rd NET_DEVICES_MAX |
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3545 | hidnplayr | 66 | |
4052 | hidnplayr | 67 | IPv4_packets_tx rd NET_DEVICES_MAX |
68 | IPv4_packets_rx rd NET_DEVICES_MAX |
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69 | IPv4_packets_dumped rd NET_DEVICES_MAX |
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3545 | hidnplayr | 70 | |
4052 | hidnplayr | 71 | IPv4_FRAGMENT_LIST rb IPv4_MAX_FRAGMENTS * sizeof.IPv4_FRAGMENT_slot |
3698 | hidnplayr | 72 | |
3545 | hidnplayr | 73 | endg |
74 | |||
75 | |||
76 | ;----------------------------------------------------------------- |
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77 | ; |
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78 | ; IPv4_init |
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79 | ; |
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80 | ; This function resets all IP variables |
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81 | ; |
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82 | ;----------------------------------------------------------------- |
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83 | macro IPv4_init { |
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84 | |||
85 | xor eax, eax |
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86 | mov edi, IP_LIST |
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4052 | hidnplayr | 87 | mov ecx, 7*NET_DEVICES_MAX + (sizeof.IPv4_FRAGMENT_slot*IPv4_MAX_FRAGMENTS)/4 |
3711 | clevermous | 88 | rep stosd |
3545 | hidnplayr | 89 | |
90 | } |
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91 | |||
92 | |||
93 | ;----------------------------------------------------------------- |
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94 | ; |
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95 | ; Decrease TimeToLive of all fragment slots |
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96 | ; |
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97 | ;----------------------------------------------------------------- |
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98 | macro IPv4_decrease_fragment_ttls { |
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99 | |||
100 | local .loop, .next |
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101 | |||
4052 | hidnplayr | 102 | mov esi, IPv4_FRAGMENT_LIST |
103 | mov ecx, IPv4_MAX_FRAGMENTS |
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3545 | hidnplayr | 104 | .loop: |
4052 | hidnplayr | 105 | cmp [esi + IPv4_FRAGMENT_slot.ttl], 0 |
3545 | hidnplayr | 106 | je .next |
4052 | hidnplayr | 107 | dec [esi + IPv4_FRAGMENT_slot.ttl] |
3545 | hidnplayr | 108 | jz .died |
109 | .next: |
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4052 | hidnplayr | 110 | add esi, sizeof.IPv4_FRAGMENT_slot |
3545 | hidnplayr | 111 | dec ecx |
112 | jnz .loop |
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113 | jmp .done |
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114 | |||
115 | .died: |
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3556 | hidnplayr | 116 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4 Fragment slot timed-out!\n" |
3545 | hidnplayr | 117 | ;;; TODO: clear all entry's of timed-out slot |
118 | jmp .next |
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119 | |||
120 | .done: |
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121 | } |
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122 | |||
123 | |||
124 | |||
125 | macro IPv4_checksum ptr { |
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126 | |||
127 | ; This is the fast procedure to create or check an IP header without options |
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128 | ; To create a new checksum, the checksum field must be set to 0 before computation |
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129 | ; 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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130 | |||
131 | push ebx |
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132 | xor ebx, ebx |
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133 | add bl, [ptr+1] |
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134 | adc bh, [ptr+0] |
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135 | |||
136 | adc bl, [ptr+3] |
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137 | adc bh, [ptr+2] |
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138 | |||
139 | adc bl, [ptr+5] |
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140 | adc bh, [ptr+4] |
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141 | |||
142 | adc bl, [ptr+7] |
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143 | adc bh, [ptr+6] |
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144 | |||
145 | adc bl, [ptr+9] |
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146 | adc bh, [ptr+8] |
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147 | |||
148 | ; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation |
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149 | |||
150 | adc bl, [ptr+13] |
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151 | adc bh, [ptr+12] |
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152 | |||
153 | adc bl, [ptr+15] |
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154 | adc bh, [ptr+14] |
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155 | |||
156 | adc bl, [ptr+17] |
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157 | adc bh, [ptr+16] |
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158 | |||
159 | adc bl, [ptr+19] |
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160 | adc bh, [ptr+18] |
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161 | |||
162 | adc ebx, 0 |
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163 | |||
164 | push ecx |
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165 | mov ecx, ebx |
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166 | shr ecx, 16 |
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167 | and ebx, 0xffff |
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168 | add ebx, ecx |
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169 | |||
170 | mov ecx, ebx |
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171 | shr ecx, 16 |
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172 | add ebx, ecx |
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173 | |||
174 | not bx |
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175 | jnz .not_zero |
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176 | dec bx |
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177 | .not_zero: |
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178 | xchg bl, bh |
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179 | pop ecx |
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180 | |||
181 | neg word [ptr+10] ; zero will stay zero so we just get the checksum |
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182 | add word [ptr+10], bx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :) |
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183 | pop ebx |
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184 | |||
185 | } |
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186 | |||
187 | |||
188 | |||
189 | ;----------------------------------------------------------------- |
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190 | ; |
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191 | ; IPv4_input: |
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192 | ; |
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193 | ; Will check if IPv4 Packet isnt damaged |
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194 | ; and call appropriate handler. (TCP/UDP/ICMP/..) |
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195 | ; |
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196 | ; It will also re-construct fragmented packets |
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197 | ; |
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198 | ; IN: Pointer to buffer in [esp] |
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199 | ; size of buffer in [esp+4] |
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200 | ; pointer to device struct in ebx |
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201 | ; pointer to IPv4 header in edx |
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202 | ; size of IPv4 packet in ecx |
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203 | ; OUT: / |
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204 | ; |
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205 | ;----------------------------------------------------------------- |
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206 | align 4 |
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207 | IPv4_input: ; TODO: add IPv4 raw sockets support |
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208 | |||
3556 | hidnplayr | 209 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input, packet from: %u.%u.%u.%u ",\ |
3545 | hidnplayr | 210 | [edx + IPv4_header.SourceAddress + 0]:1,[edx + IPv4_header.SourceAddress + 1]:1,\ |
211 | [edx + IPv4_header.SourceAddress + 2]:1,[edx + IPv4_header.SourceAddress + 3]:1 |
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3556 | hidnplayr | 212 | DEBUGF DEBUG_NETWORK_VERBOSE, "to: %u.%u.%u.%u\n",\ |
3545 | hidnplayr | 213 | [edx + IPv4_header.DestinationAddress + 0]:1,[edx + IPv4_header.DestinationAddress + 1]:1,\ |
214 | [edx + IPv4_header.DestinationAddress + 2]:1,[edx + IPv4_header.DestinationAddress + 3]:1 |
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215 | |||
216 | ;------------------------------- |
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217 | ; re-calculate the checksum |
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218 | |||
219 | IPv4_checksum edx |
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220 | jnz .dump ; if checksum isn't valid then dump packet |
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221 | |||
3556 | hidnplayr | 222 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Checksum ok\n" |
3545 | hidnplayr | 223 | |
224 | ;----------------------------------- |
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225 | ; Check if destination IP is correct |
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226 | |||
3643 | hidnplayr | 227 | call NET_ptr_to_num4 |
3545 | hidnplayr | 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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4052 | hidnplayr | 266 | inc [IPv4_packets_rx + edi] |
3545 | hidnplayr | 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" |
4052 | hidnplayr | 307 | inc [IPv4_packets_dumped] ; FIXME: use correct interface |
3861 | hidnplayr | 308 | call NET_packet_free |
3545 | hidnplayr | 309 | add esp, 4 ; pop (balance stack) |
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 | |||
4258 | hidnplayr | 322 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: fragmented packet offset=%u id=%x ptr=0x%x\n", ax, [edx + IPv4_header.Identification]:4, edx |
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 | |||
4052 | hidnplayr | 337 | mov [esi + IPv4_FRAGMENT_slot.ttl], 15 ; Reset the ttl |
338 | mov esi, [esi + IPv4_FRAGMENT_slot.ptr] |
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3545 | hidnplayr | 339 | or edi, -1 |
340 | .find_last_entry: ; The following routine will try to find the last entry |
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4052 | hidnplayr | 341 | cmp edi, [esi + IPv4_FRAGMENT_entry.PrevPtr] |
3545 | hidnplayr | 342 | jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
343 | mov edi, esi |
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4052 | hidnplayr | 344 | mov esi, [esi + IPv4_FRAGMENT_entry.NextPtr] |
3545 | hidnplayr | 345 | cmp esi, -1 |
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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4052 | hidnplayr | 351 | mov [edi + IPv4_FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry |
352 | mov [eax + IPv4_FRAGMENT_entry.NextPtr], -1 |
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353 | mov [eax + IPv4_FRAGMENT_entry.PrevPtr], edi |
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354 | mov [eax + IPv4_FRAGMENT_entry.Owner], ebx |
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3545 | hidnplayr | 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.. |
4052 | hidnplayr | 366 | mov ecx, IPv4_MAX_FRAGMENTS |
367 | mov esi, IPv4_FRAGMENT_LIST |
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3545 | hidnplayr | 368 | .find_free_slot: |
4052 | hidnplayr | 369 | cmp word [esi + IPv4_FRAGMENT_slot.ttl], 0 |
3545 | hidnplayr | 370 | je .found_free_slot |
4052 | hidnplayr | 371 | add esi, sizeof.IPv4_FRAGMENT_slot |
3545 | hidnplayr | 372 | loop .find_free_slot |
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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4052 | hidnplayr | 376 | mov [esi + IPv4_FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl |
3545 | hidnplayr | 377 | mov ax, [edx + IPv4_header.Identification] |
4052 | hidnplayr | 378 | mov [esi + IPv4_FRAGMENT_slot.id], ax |
3545 | hidnplayr | 379 | mov eax, [edx + IPv4_header.SourceAddress] |
4052 | hidnplayr | 380 | mov [esi + IPv4_FRAGMENT_slot.SrcIP], eax |
3545 | hidnplayr | 381 | mov eax, [edx + IPv4_header.DestinationAddress] |
4052 | hidnplayr | 382 | mov [esi + IPv4_FRAGMENT_slot.DstIP], eax |
3545 | hidnplayr | 383 | pop eax |
4052 | hidnplayr | 384 | mov [esi + IPv4_FRAGMENT_slot.ptr], eax |
3545 | hidnplayr | 385 | ; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure |
4052 | hidnplayr | 386 | mov [eax + IPv4_FRAGMENT_entry.NextPtr], -1 |
387 | mov [eax + IPv4_FRAGMENT_entry.PrevPtr], -1 |
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388 | mov [eax + IPv4_FRAGMENT_entry.Owner], ebx |
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3545 | hidnplayr | 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 | |||
4052 | hidnplayr | 404 | 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 |
3545 | hidnplayr | 405 | push esi |
406 | xor eax, eax |
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407 | or edi, -1 |
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408 | |||
409 | .count_bytes: |
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4052 | hidnplayr | 410 | cmp [esi + IPv4_FRAGMENT_entry.PrevPtr], edi |
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.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Add total length |
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3545 | hidnplayr | 413 | xchg cl, ch |
3556 | hidnplayr | 414 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet size=%u\n", cx |
3545 | hidnplayr | 415 | add ax, cx |
4052 | hidnplayr | 416 | movzx cx, [esi + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Sub Header length |
3545 | hidnplayr | 417 | and cx, 0x000F |
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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4052 | hidnplayr | 422 | mov esi, [esi + IPv4_FRAGMENT_entry.NextPtr] |
3545 | hidnplayr | 423 | cmp esi, -1 |
424 | jne .count_bytes |
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425 | |||
426 | mov esi, [esp+4] |
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4052 | hidnplayr | 427 | mov [edi + IPv4_FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code |
428 | mov [esi + IPv4_FRAGMENT_entry.NextPtr], -1 |
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429 | mov [esi + IPv4_FRAGMENT_entry.PrevPtr], edi |
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430 | mov [esi + IPv4_FRAGMENT_entry.Owner], ebx |
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3545 | hidnplayr | 431 | |
4052 | hidnplayr | 432 | mov cx, [edx + IPv4_header.TotalLength] ; Note: This time we dont substract Header length |
3545 | hidnplayr | 433 | xchg cl, ch |
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 |
||
441 | shl ax, 3 |
||
442 | add cx, ax |
||
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 |
||
451 | call kernel_alloc |
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452 | test eax, eax |
||
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 |
||
455 | |||
456 | .rebuild_packet_loop: |
||
4052 | hidnplayr | 457 | movzx ecx, [edx + sizeof.IPv4_FRAGMENT_entry + IPv4_header.FlagsAndFragmentOffset] ; Calculate the fragment offset |
3545 | hidnplayr | 458 | xchg cl, ch ; intel byte order |
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 |
||
4258 | hidnplayr | 463 | movzx ebx, [edx + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment |
3545 | hidnplayr | 464 | and bx, 0x000F ; |
465 | shl bx, 2 ; |
||
466 | |||
4258 | hidnplayr | 467 | lea esi, [edx + sizeof.IPv4_FRAGMENT_entry] ; Set esi to the correct begin of fragment |
468 | movzx ecx, [edx + sizeof.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment |
||
3545 | hidnplayr | 469 | xchg cl, ch ; intel byte order |
470 | |||
471 | cmp edi, eax ; Is this packet the first fragment ? |
||
472 | je .first_fragment |
||
473 | sub cx, bx ; If not, dont copy the header |
||
474 | add esi, ebx ; |
||
475 | .first_fragment: |
||
476 | |||
4258 | hidnplayr | 477 | |
478 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Copying %u bytes from 0x%x to 0x%x\n", ecx, esi, edi |
||
3545 | hidnplayr | 479 | push cx ; First copy dword-wise, then byte-wise |
480 | shr cx, 2 ; |
||
3711 | clevermous | 481 | rep movsd ; |
3545 | hidnplayr | 482 | pop cx ; |
483 | and cx, 3 ; |
||
3711 | clevermous | 484 | rep movsb ; |
3545 | hidnplayr | 485 | |
486 | push eax |
||
4258 | hidnplayr | 487 | push [edx + IPv4_FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet |
488 | push [edx + IPv4_FRAGMENT_entry.NextPtr] ; Set edx to the next pointer |
||
3545 | hidnplayr | 489 | push edx ; Push pointer to fragment onto stack |
4258 | hidnplayr | 490 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Next Fragment: 0x%x\n", edx |
3861 | hidnplayr | 491 | call NET_packet_free ; free the previous fragment buffer (this uses the value from stack) |
4258 | hidnplayr | 492 | pop edx ebx eax |
3545 | hidnplayr | 493 | cmp edx, -1 ; Check if it is last fragment in chain |
494 | jne .rebuild_packet_loop |
||
495 | |||
496 | pop ecx |
||
497 | xchg cl, ch |
||
498 | mov edx, eax |
||
499 | mov [edx + IPv4_header.TotalLength], cx |
||
500 | add esp, 8 |
||
501 | xchg cl, ch |
||
502 | push ecx |
||
503 | |||
4258 | hidnplayr | 504 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet is now de-fragmented\n" |
505 | |||
3545 | hidnplayr | 506 | push eax |
507 | jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr |
||
508 | |||
509 | .destroy_slot_pop: |
||
510 | add esp, 4 |
||
511 | .destroy_slot: |
||
3556 | hidnplayr | 512 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Destroy fragment slot!\n" |
3545 | hidnplayr | 513 | ; TODO! |
514 | jmp .dump |
||
515 | |||
516 | |||
517 | |||
518 | |||
519 | |||
520 | ;----------------------------------------------------------------- |
||
521 | ; |
||
522 | ; find fragment slot |
||
523 | ; |
||
524 | ; IN: pointer to fragmented packet in edx |
||
525 | ; OUT: pointer to slot in esi, -1 on error |
||
526 | ; |
||
527 | ;----------------------------------------------------------------- |
||
528 | align 4 |
||
529 | IPv4_find_fragment_slot: |
||
530 | |||
531 | ;;; TODO: the RFC says we should check protocol number too |
||
532 | |||
533 | push eax ebx ecx edx |
||
534 | mov ax, [edx + IPv4_header.Identification] |
||
4052 | hidnplayr | 535 | mov ecx, IPv4_MAX_FRAGMENTS |
536 | mov esi, IPv4_FRAGMENT_LIST |
||
3545 | hidnplayr | 537 | mov ebx, [edx + IPv4_header.SourceAddress] |
538 | mov edx, [edx + IPv4_header.DestinationAddress] |
||
539 | .find_slot: |
||
4052 | hidnplayr | 540 | cmp [esi + IPv4_FRAGMENT_slot.id], ax |
3545 | hidnplayr | 541 | jne .try_next |
4052 | hidnplayr | 542 | cmp [esi + IPv4_FRAGMENT_slot.SrcIP], ebx |
3545 | hidnplayr | 543 | jne .try_next |
4052 | hidnplayr | 544 | cmp [esi + IPv4_FRAGMENT_slot.DstIP], edx |
3545 | hidnplayr | 545 | je .found_slot |
546 | .try_next: |
||
4052 | hidnplayr | 547 | add esi, sizeof.IPv4_FRAGMENT_slot |
3545 | hidnplayr | 548 | loop .find_slot |
549 | |||
550 | or esi, -1 |
||
551 | .found_slot: |
||
552 | pop edx ecx ebx eax |
||
553 | ret |
||
554 | |||
555 | |||
556 | ;------------------------------------------------------------------ |
||
557 | ; |
||
558 | ; IPv4_output |
||
559 | ; |
||
4052 | hidnplayr | 560 | ; IN: eax = Destination IP |
561 | ; ecx = data length |
||
562 | ; edx = Source IP |
||
563 | ; di = TTL shl 8 + protocol |
||
3545 | hidnplayr | 564 | ; |
4052 | hidnplayr | 565 | ; OUT: eax = pointer to buffer start |
566 | ; ebx = pointer to device struct (needed for sending procedure) |
||
567 | ; ecx = unchanged (packet size of embedded data) |
||
568 | ; edx = size of complete buffer |
||
569 | ; edi = pointer to start of data (0 on error) |
||
3545 | hidnplayr | 570 | ; |
571 | ;------------------------------------------------------------------ |
||
572 | align 4 |
||
573 | IPv4_output: |
||
574 | |||
3601 | hidnplayr | 575 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: size=%u ip=0x%x\n", ecx, eax |
3545 | hidnplayr | 576 | |
577 | cmp ecx, 65500 ; Max IPv4 packet size |
||
578 | ja .too_large |
||
579 | |||
4052 | hidnplayr | 580 | push ecx di eax |
581 | call IPv4_route ; outputs device number in edi, dest ip in eax, source IP in edx |
||
582 | push edx |
||
3545 | hidnplayr | 583 | |
3610 | hidnplayr | 584 | test edi, edi |
585 | jz .loopback |
||
586 | |||
3545 | hidnplayr | 587 | call ARP_IP_to_MAC |
588 | test eax, 0xffff0000 ; error bits |
||
589 | jnz .arp_error |
||
590 | push ebx ; push the mac onto the stack |
||
591 | push ax |
||
592 | |||
4052 | hidnplayr | 593 | inc [IPv4_packets_tx + edi] ; update stats |
3545 | hidnplayr | 594 | |
3638 | hidnplayr | 595 | mov ebx, [NET_DRV_LIST + edi] |
3545 | hidnplayr | 596 | lea eax, [ebx + ETH_DEVICE.mac] |
597 | mov edx, esp |
||
4052 | hidnplayr | 598 | mov ecx, [esp + 6 + 8 + 2] |
3545 | hidnplayr | 599 | add ecx, sizeof.IPv4_header |
3600 | hidnplayr | 600 | mov di, ETHER_PROTO_IPv4 |
3545 | hidnplayr | 601 | call ETH_output |
602 | jz .eth_error |
||
603 | add esp, 6 ; pop the mac out of the stack |
||
604 | |||
605 | .continue: |
||
606 | xchg cl, ch ; internet byte order |
||
607 | mov [edi + IPv4_header.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header) |
||
608 | mov [edi + IPv4_header.TypeOfService], 0 ; nothing special, just plain ip packet |
||
609 | mov [edi + IPv4_header.TotalLength], cx |
||
610 | mov [edi + IPv4_header.Identification], 0 ; fragment id: FIXME |
||
611 | mov [edi + IPv4_header.FlagsAndFragmentOffset], 0 |
||
4052 | hidnplayr | 612 | |
3545 | hidnplayr | 613 | mov [edi + IPv4_header.HeaderChecksum], 0 |
614 | popd [edi + IPv4_header.SourceAddress] |
||
615 | popd [edi + IPv4_header.DestinationAddress] |
||
616 | |||
4052 | hidnplayr | 617 | pop word[edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
618 | ; [edi + IPv4_header.Protocol] |
||
619 | |||
3545 | hidnplayr | 620 | pop ecx |
621 | |||
622 | IPv4_checksum edi |
||
623 | add edi, sizeof.IPv4_header |
||
3556 | hidnplayr | 624 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: success!\n" |
3545 | hidnplayr | 625 | ret |
626 | |||
627 | .eth_error: |
||
3603 | hidnplayr | 628 | DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ethernet error\n" |
3545 | hidnplayr | 629 | add esp, 3*4+2+6 |
630 | xor edi, edi |
||
631 | ret |
||
632 | |||
633 | .arp_error: |
||
3603 | hidnplayr | 634 | DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ARP error=%x\n", eax |
3545 | hidnplayr | 635 | add esp, 3*4+2 |
636 | xor edi, edi |
||
637 | ret |
||
638 | |||
639 | .too_large: |
||
3556 | hidnplayr | 640 | DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: Packet too large!\n" |
3545 | hidnplayr | 641 | xor edi, edi |
642 | ret |
||
643 | |||
644 | .loopback: |
||
3610 | hidnplayr | 645 | mov dword [esp + 2], eax ; change source IP to dest IP |
646 | mov ecx, [esp + 10] |
||
3545 | hidnplayr | 647 | add ecx, sizeof.IPv4_header |
3600 | hidnplayr | 648 | mov edi, AF_INET4 |
3545 | hidnplayr | 649 | call LOOP_output |
650 | jmp .continue |
||
651 | |||
652 | |||
653 | |||
654 | |||
655 | ;------------------------------------------------------------------ |
||
656 | ; |
||
657 | ; IPv4_output_raw |
||
658 | ; |
||
659 | ; IN: eax = socket ptr |
||
660 | ; ecx = data length |
||
661 | ; esi = data ptr |
||
662 | ; |
||
663 | ; OUT: / |
||
664 | ; |
||
665 | ;------------------------------------------------------------------ |
||
666 | align 4 |
||
667 | IPv4_output_raw: |
||
668 | |||
669 | DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax |
||
670 | |||
671 | cmp ecx, 1480 ;;;;; FIXME |
||
672 | ja .too_large |
||
673 | |||
674 | sub esp, 8 |
||
675 | push esi eax |
||
676 | |||
677 | call IPv4_route |
||
678 | call ARP_IP_to_MAC |
||
679 | |||
680 | test eax, 0xffff0000 ; error bits |
||
681 | jnz .arp_error |
||
682 | |||
683 | push ebx ; push the mac |
||
684 | push ax |
||
685 | |||
4052 | hidnplayr | 686 | inc [IPv4_packets_tx + 4*edi] |
3601 | hidnplayr | 687 | mov ebx, [NET_DRV_LIST + 4*edi] |
3545 | hidnplayr | 688 | lea eax, [ebx + ETH_DEVICE.mac] |
689 | mov edx, esp |
||
690 | mov ecx, [esp + 6 + 4] |
||
691 | add ecx, sizeof.IPv4_header |
||
3600 | hidnplayr | 692 | mov di, ETHER_PROTO_IPv4 |
3545 | hidnplayr | 693 | call ETH_output |
694 | jz .error |
||
695 | |||
696 | add esp, 6 ; pop the mac |
||
697 | |||
698 | mov dword[esp+4+4], edx |
||
699 | mov dword[esp+4+4+4], eax |
||
700 | |||
701 | pop eax esi |
||
702 | ;; todo: check socket options if we should add header, or just compute checksum |
||
703 | |||
704 | push edi ecx |
||
3711 | clevermous | 705 | rep movsb |
3545 | hidnplayr | 706 | pop ecx edi |
707 | |||
708 | ; [edi + IPv4_header.VersionAndIHL] ; IPv4, normal length (no Optional header) |
||
709 | ; [edi + IPv4_header.TypeOfService] ; nothing special, just plain ip packet |
||
710 | ; [edi + IPv4_header.TotalLength] |
||
711 | ; [edi + IPv4_header.TotalLength] ; internet byte order |
||
712 | ; [edi + IPv4_header.FlagsAndFragmentOffset] |
||
713 | |||
714 | mov [edi + IPv4_header.HeaderChecksum], 0 |
||
715 | |||
716 | ; [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
||
717 | ; [edi + IPv4_header.Protocol] |
||
718 | ; [edi + IPv4_header.Identification] ; fragment id |
||
719 | ; [edi + IPv4_header.SourceAddress] |
||
720 | ; [edi + IPv4_header.DestinationAddress] |
||
721 | |||
722 | IPv4_checksum edi ;;;; todo: checksum for IP packet with options! |
||
723 | add edi, sizeof.IPv4_header |
||
3556 | hidnplayr | 724 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output_raw: device=%x\n", ebx |
3545 | hidnplayr | 725 | call [ebx + NET_DEVICE.transmit] |
726 | ret |
||
727 | |||
728 | .error: |
||
729 | add esp, 6 |
||
730 | .arp_error: |
||
731 | add esp, 8+4+4 |
||
732 | .too_large: |
||
3556 | hidnplayr | 733 | DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output_raw: Failed\n" |
3545 | hidnplayr | 734 | sub edi, edi |
735 | ret |
||
736 | |||
737 | |||
738 | ;-------------------------------------------------------- |
||
739 | ; |
||
740 | ; |
||
741 | ; IN: dword [esp] = pointer to buffer containing ipv4 packet to be fragmented |
||
742 | ; dword [esp+4] = buffer size |
||
743 | ; esi = pointer to ip header in that buffer |
||
744 | ; ecx = max size of fragments |
||
745 | ; |
||
746 | ; OUT: / |
||
747 | ; |
||
748 | ;-------------------------------------------------------- |
||
749 | |||
750 | align 4 |
||
751 | IPv4_fragment: |
||
752 | |||
3556 | hidnplayr | 753 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_fragment\n" |
3545 | hidnplayr | 754 | |
755 | and ecx, not 111b ; align 4 |
||
756 | |||
757 | cmp ecx, sizeof.IPv4_header + 8 ; must be able to put at least 8 bytes |
||
758 | jb .err2 |
||
759 | |||
760 | push esi ecx |
||
761 | mov eax, [esi + IPv4_header.DestinationAddress] |
||
762 | call ARP_IP_to_MAC |
||
763 | pop ecx esi |
||
764 | cmp eax, -1 |
||
765 | jz .err2 |
||
766 | |||
767 | push ebx |
||
768 | push ax |
||
769 | |||
770 | mov ebx, [NET_DRV_LIST] |
||
771 | lea eax, [ebx + ETH_DEVICE.mac] |
||
772 | push eax |
||
773 | |||
774 | |||
775 | push esi ; ptr to ip header |
||
776 | sub ecx, sizeof.IPv4_header ; substract header size |
||
777 | push ecx ; max data size |
||
778 | push dword 0 ; offset |
||
779 | |||
780 | .new_fragment: |
||
3556 | hidnplayr | 781 | DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: new fragment" |
3545 | hidnplayr | 782 | |
783 | |||
784 | mov eax, [esp + 3*4] |
||
785 | lea ebx, [esp + 4*4] |
||
3600 | hidnplayr | 786 | mov di , ETHER_PROTO_IPv4 |
3545 | hidnplayr | 787 | call ETH_output |
788 | |||
789 | cmp edi, -1 |
||
790 | jz .err |
||
791 | |||
792 | ; copy header |
||
793 | mov esi, [esp + 2*4] |
||
794 | mov ecx, 5 ; 5 dwords: TODO: use IHL field of the header! |
||
3711 | clevermous | 795 | rep movsd |
3545 | hidnplayr | 796 | |
797 | ; copy data |
||
798 | mov esi, [esp + 2*4] |
||
799 | add esi, sizeof.IPv4_header |
||
800 | add esi, [esp] ; offset |
||
801 | |||
802 | mov ecx, [esp + 1*4] |
||
3556 | hidnplayr | 803 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_fragment: copying %u bytes\n", ecx |
3711 | clevermous | 804 | rep movsb |
3545 | hidnplayr | 805 | |
806 | ; now, correct header |
||
807 | mov ecx, [esp + 1*4] |
||
808 | add ecx, sizeof.IPv4_header |
||
809 | xchg cl, ch |
||
810 | mov [edi + IPv4_header.TotalLength], cx |
||
811 | |||
812 | mov ecx, [esp] ; offset |
||
813 | xchg cl, ch |
||
814 | |||
815 | ; cmp dword[esp + 4*4], 0 ; last fragment?;<<<<<< |
||
816 | ; je .last_fragment |
||
817 | or cx, 1 shl 2 ; more fragments |
||
818 | ; .last_fragment: |
||
819 | mov [edi + IPv4_header.FlagsAndFragmentOffset], cx |
||
820 | |||
821 | mov [edi + IPv4_header.HeaderChecksum], 0 |
||
822 | |||
823 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< send the packet |
||
824 | mov ecx, [esp + 1*4] |
||
825 | |||
826 | push edx eax |
||
827 | IPv4_checksum edi |
||
828 | |||
829 | call [ebx + NET_DEVICE.transmit] |
||
830 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
||
831 | |||
3711 | clevermous | 832 | mov ecx, [esp+4] |
3545 | hidnplayr | 833 | add [esp], ecx |
834 | |||
835 | mov ecx, [esp+3*4+6+4] ; ptr to begin of buff |
||
836 | add ecx, [esp+3*4+6+4+4] ; buff size |
||
837 | sub ecx, [esp+2*4] ; ptr to ip header |
||
838 | add ecx, [esp] ; offset |
||
839 | |||
3556 | hidnplayr | 840 | DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: %u bytes remaining\n", ecx |
3545 | hidnplayr | 841 | |
842 | cmp ecx, [esp+1*4] |
||
843 | jae .new_fragment |
||
844 | |||
845 | mov [esp+4], ecx ; set fragment size to remaining packet size |
||
846 | jmp .new_fragment |
||
847 | |||
848 | .err: |
||
3556 | hidnplayr | 849 | DEBUGF DEBUG_NETWORK_ERROR, "Ipv4_fragment: failed\n" |
3545 | hidnplayr | 850 | .done: |
851 | add esp, 12 + 4 + 6 |
||
852 | .err2: |
||
3556 | hidnplayr | 853 | DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: dumping\n" |
3861 | hidnplayr | 854 | call NET_packet_free |
3545 | hidnplayr | 855 | add esp, 4 |
856 | |||
857 | ret |
||
858 | |||
859 | |||
860 | |||
861 | ;--------------------------------------------------------------------------- |
||
862 | ; |
||
863 | ; IPv4_route |
||
864 | ; |
||
865 | ; IN: eax = Destination IP |
||
4052 | hidnplayr | 866 | ; edx = Source IP |
867 | ; OUT: eax = Destination IP (or gateway IP) |
||
868 | ; edx = Source IP |
||
869 | ; edi = device number*4 |
||
870 | ; DESTROYED: |
||
871 | ; ecx |
||
3545 | hidnplayr | 872 | ; |
873 | ;--------------------------------------------------------------------------- |
||
874 | align 4 |
||
4052 | hidnplayr | 875 | IPv4_route: ; TODO: return error if no valid route found |
3545 | hidnplayr | 876 | |
877 | cmp eax, 0xffffffff |
||
878 | je .broadcast |
||
879 | |||
880 | xor edi, edi |
||
881 | .loop: |
||
4052 | hidnplayr | 882 | mov ebx, [IP_LIST + edi] |
883 | and ebx, [SUBNET_LIST + edi] |
||
3545 | hidnplayr | 884 | jz .next |
4052 | hidnplayr | 885 | mov ecx, eax |
886 | and ecx, [SUBNET_LIST + edi] |
||
887 | cmp ebx, ecx |
||
888 | je .got_it |
||
3545 | hidnplayr | 889 | .next: |
890 | add edi, 4 |
||
4052 | hidnplayr | 891 | cmp edi, 4*NET_DEVICES_MAX |
892 | jb .loop |
||
3545 | hidnplayr | 893 | |
4052 | hidnplayr | 894 | mov eax, [GATEWAY_LIST + 4] ; TODO: let user (or a user space daemon) configure default route |
3545 | hidnplayr | 895 | .broadcast: |
4052 | hidnplayr | 896 | mov edi, 4 ; TODO: same as above |
897 | .got_it: |
||
898 | DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_route: %u\n", edi |
||
899 | test edx, edx |
||
900 | jnz @f |
||
901 | mov edx, [IP_LIST + edi] |
||
902 | @@: |
||
903 | |||
3545 | hidnplayr | 904 | ret |
905 | |||
906 | |||
907 | |||
908 | ;--------------------------------------------------------------------------- |
||
909 | ; |
||
910 | ; IPv4_get_frgmnt_num |
||
911 | ; |
||
912 | ; IN: / |
||
913 | ; OUT: fragment number in ax |
||
914 | ; |
||
915 | ;--------------------------------------------------------------------------- |
||
916 | align 4 |
||
917 | IPv4_get_frgmnt_num: |
||
918 | xor ax, ax ;;; TODO: replace this with real code |
||
919 | |||
920 | ret |
||
921 | |||
922 | |||
4030 | hidnplayr | 923 | ;----------------------------------------------------------------- |
924 | ; |
||
925 | ; IPv4_connect |
||
926 | ; |
||
927 | ; IN: eax = socket pointer |
||
928 | ; OUT: eax = 0 ok / -1 error |
||
929 | ; ebx = error code |
||
930 | ; |
||
931 | ;------------------------- |
||
932 | align 4 |
||
933 | IPv4_connect: |
||
934 | |||
4035 | hidnplayr | 935 | push eax edx |
4030 | hidnplayr | 936 | lea ecx, [eax + SOCKET.mutex] |
937 | call mutex_lock |
||
4035 | hidnplayr | 938 | pop edx eax |
4030 | hidnplayr | 939 | |
940 | ; Fill in local IP |
||
941 | cmp [eax + IP_SOCKET.LocalIP], 0 |
||
942 | jne @f |
||
943 | push [IP_LIST + 4] ; FIXME: use correct local IP |
||
944 | pop [eax + IP_SOCKET.LocalIP] |
||
945 | |||
946 | ; Fill in remote IP |
||
947 | pushd [edx + 4] |
||
948 | pop [eax + IP_SOCKET.RemoteIP] |
||
949 | |||
4035 | hidnplayr | 950 | ; Set up data receiving queue |
4030 | hidnplayr | 951 | push eax |
4035 | hidnplayr | 952 | init_queue (eax + SOCKET_QUEUE_LOCATION) |
4030 | hidnplayr | 953 | pop eax |
954 | |||
955 | lea ecx, [eax + SOCKET.mutex] |
||
956 | call mutex_unlock |
||
957 | |||
958 | xor eax, eax |
||
959 | ret |
||
960 | |||
961 | |||
3545 | hidnplayr | 962 | ;--------------------------------------------------------------------------- |
963 | ; |
||
964 | ; IPv4_API |
||
965 | ; |
||
966 | ; This function is called by system function 75 |
||
967 | ; |
||
968 | ; IN: subfunction number in bl |
||
969 | ; device number in bh |
||
970 | ; ecx, edx, .. depends on subfunction |
||
971 | ; |
||
972 | ; OUT: |
||
973 | ; |
||
974 | ;--------------------------------------------------------------------------- |
||
975 | align 4 |
||
976 | IPv4_api: |
||
977 | |||
978 | movzx eax, bh |
||
979 | shl eax, 2 |
||
980 | |||
981 | and ebx, 0x000000ff |
||
982 | cmp ebx, .number |
||
983 | ja .error |
||
984 | jmp dword [.table + 4*ebx] |
||
985 | |||
986 | .table: |
||
987 | dd .packets_tx ; 0 |
||
988 | dd .packets_rx ; 1 |
||
989 | dd .read_ip ; 2 |
||
990 | dd .write_ip ; 3 |
||
991 | dd .read_dns ; 4 |
||
992 | dd .write_dns ; 5 |
||
993 | dd .read_subnet ; 6 |
||
994 | dd .write_subnet ; 7 |
||
995 | dd .read_gateway ; 8 |
||
996 | dd .write_gateway ; 9 |
||
997 | .number = ($ - .table) / 4 - 1 |
||
998 | |||
999 | .error: |
||
1000 | mov eax, -1 |
||
1001 | ret |
||
1002 | |||
1003 | .packets_tx: |
||
4052 | hidnplayr | 1004 | mov eax, [IPv4_packets_tx + eax] |
3545 | hidnplayr | 1005 | ret |
1006 | |||
1007 | .packets_rx: |
||
4052 | hidnplayr | 1008 | mov eax, [IPv4_packets_rx + eax] |
3545 | hidnplayr | 1009 | ret |
1010 | |||
1011 | .read_ip: |
||
1012 | mov eax, [IP_LIST + eax] |
||
1013 | ret |
||
1014 | |||
1015 | .write_ip: |
||
1016 | mov [IP_LIST + eax], ecx |
||
1017 | mov edi, eax ; device number, we'll need it for ARP |
||
1018 | |||
1019 | ; pre-calculate the local broadcast address |
||
1020 | mov ebx, [SUBNET_LIST + eax] |
||
1021 | not ebx |
||
1022 | or ebx, ecx |
||
1023 | mov [BROADCAST_LIST + eax], ebx |
||
1024 | |||
3601 | hidnplayr | 1025 | mov ebx, [NET_DRV_LIST + eax] |
1026 | mov eax, [IP_LIST + eax] |
||
3545 | hidnplayr | 1027 | call ARP_output_request ; now send a gratuitous ARP |
1028 | |||
1029 | call NET_send_event |
||
1030 | xor eax, eax |
||
1031 | ret |
||
1032 | |||
1033 | .read_dns: |
||
1034 | mov eax, [DNS_LIST + eax] |
||
1035 | ret |
||
1036 | |||
1037 | .write_dns: |
||
1038 | mov [DNS_LIST + eax], ecx |
||
1039 | call NET_send_event |
||
1040 | xor eax, eax |
||
1041 | ret |
||
1042 | |||
1043 | .read_subnet: |
||
1044 | mov eax, [SUBNET_LIST + eax] |
||
1045 | ret |
||
1046 | |||
1047 | .write_subnet: |
||
1048 | mov [SUBNET_LIST + eax], ecx |
||
1049 | |||
1050 | ; pre-calculate the local broadcast address |
||
1051 | mov ebx, [IP_LIST + eax] |
||
1052 | not ecx |
||
1053 | or ecx, ebx |
||
1054 | mov [BROADCAST_LIST + eax], ecx |
||
1055 | |||
1056 | call NET_send_event |
||
1057 | xor eax, eax |
||
1058 | ret |
||
1059 | |||
1060 | .read_gateway: |
||
1061 | mov eax, [GATEWAY_LIST + eax] |
||
1062 | ret |
||
1063 | |||
1064 | .write_gateway: |
||
1065 | mov [GATEWAY_LIST + eax], ecx |
||
1066 | |||
1067 | call NET_send_event |
||
1068 | xor eax, eax |
||
1069 | ret |