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1159 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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1196 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2009. All rights reserved. ;; |
1159 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;; IP.INC ;; |
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7 | ;; ;; |
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8 | ;; Part of the tcp/ip network stack for KolibriOS ;; |
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9 | ;; ;; |
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10 | ;; Based on the work of [Johnny_B] and [smb] ;; |
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11 | ;; ;; |
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12 | ;; Written by hidnplayr@kolibrios.org ;; |
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13 | ;; ;; |
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14 | ;; GNU GENERAL PUBLIC LICENSE ;; |
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15 | ;; Version 2, June 1991 ;; |
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16 | ;; ;; |
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17 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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18 | |||
1206 | hidnplayr | 19 | $Revision: 1206 $ |
1159 | hidnplayr | 20 | |
21 | ; IP underlying protocols numbers |
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22 | |||
23 | ETHER_IPv4 equ 0x0008 ; Reversed from 0800 for intel |
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24 | |||
25 | MAX_FRAGMENTS equ 16 |
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26 | MAX_IP equ MAX_NET_DEVICES |
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27 | |||
28 | struct IPv4_Packet |
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29 | .VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits] |
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30 | .TypeOfService db ? |
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31 | .TotalLength dw ? |
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32 | .Identification dw ? |
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33 | .FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15] |
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34 | .TimeToLive db ? ; |
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35 | .Protocol db ? |
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36 | .HeaderChecksum dw ? |
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37 | .SourceAddress dd ? |
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38 | .DestinationAddress dd ? |
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39 | .DataOrOptional: |
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40 | ends |
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41 | |||
42 | struct FRAGMENT_slot |
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43 | .ttl dw ? ; Time to live for this entry, 0 for empty slot's |
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44 | .id dw ? ; Identification field from IP header |
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45 | .SrcIP dd ? ; .. from IP header |
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46 | .DstIP dd ? ; .. from IP header |
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47 | .ptr dd ? ; Pointer to first packet |
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48 | .size: |
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49 | ends |
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50 | |||
51 | struct FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets |
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52 | .PrevPtr dd ? ; Pointer to previous fragment entry (-1 for first packet) |
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53 | .NextPtr dd ? ; Pointer to next fragment entry (-1 for last packet) |
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54 | .Owner dd ? ; Pointer to structure of driver |
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55 | rb 2 ; to match ethernet header size |
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56 | .Data: ; Ip header begins here (we will need the IP header to re-construct the complete packet) |
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57 | ends |
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58 | |||
59 | align 4 |
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60 | uglobal |
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61 | BROADCAST dd ? |
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62 | IP_LIST rd MAX_IP |
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63 | SUBNET_LIST rd MAX_IP |
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64 | DNS_LIST rd MAX_IP |
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65 | GATEWAY_LIST rd MAX_IP |
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66 | IP_PACKETS_TX rd MAX_IP |
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67 | IP_PACKETS_RX rd MAX_IP |
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68 | FRAGMENT_LIST rb MAX_FRAGMENTS*FRAGMENT_slot.size |
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69 | endg |
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70 | |||
71 | |||
72 | ;----------------------------------------------------------------- |
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73 | ; |
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74 | ; IPv4_init |
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75 | ; |
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76 | ; This function resets all IP variables |
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77 | ; |
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78 | ; IN: / |
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79 | ; OUT: / |
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80 | ; |
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81 | ;----------------------------------------------------------------- |
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82 | |||
83 | align 4 |
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84 | IPv4_init: |
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85 | |||
86 | or eax, -1 |
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87 | mov edi, BROADCAST |
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1200 | hidnplayr | 88 | mov ecx, 4*MAX_IP+1 |
1159 | hidnplayr | 89 | rep stosd |
90 | |||
91 | xor eax, eax |
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92 | mov edi, FRAGMENT_LIST |
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93 | mov ecx, FRAGMENT_slot.size*MAX_FRAGMENTS/4 + 2*MAX_IP |
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94 | rep stosd |
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95 | |||
96 | ret |
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97 | |||
98 | |||
99 | |||
100 | ;----------------------------------------------------------------- |
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101 | ; |
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102 | ; IP_Handler: |
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103 | ; |
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104 | ; Called by eth_handler, |
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105 | ; will check if IP Packet isnt damaged |
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106 | ; and call appropriate handler. (TCP/UDP/ICMP/..) |
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107 | ; |
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108 | ; It will also re-construct fragmented packets |
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109 | ; |
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110 | ; IN: Pointer to buffer in [esp] |
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111 | ; size of buffer in [esp+4] |
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112 | ; pointer to device struct in ebx |
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113 | ; pointer to IP Packet data in edx |
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114 | ; OUT: / |
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115 | ; |
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116 | ;----------------------------------------------------------------- |
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117 | |||
118 | align 4 |
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1196 | hidnplayr | 119 | IPv4_handler: |
1159 | hidnplayr | 120 | |
121 | DEBUGF 1,"IP_Handler - start\n" |
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122 | mov cx , [edx + IPv4_Packet.HeaderChecksum] |
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123 | xchg ch , cl ; Get the checksum in intel format |
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124 | |||
125 | mov word [edx + IPv4_Packet.HeaderChecksum], 0 ; Clear checksum field to recalculating checksum |
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126 | |||
127 | movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field |
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128 | and eax, 0x0000000F ; |
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129 | shl eax, 2 ; |
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130 | |||
131 | push edx |
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132 | stdcall checksum_jb, edx, eax ; buf_ptr, buf_size |
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133 | pop edx |
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134 | cmp cx , ax |
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135 | jnz .dump ; if CHECKSUM isn't valid then dump Packet |
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136 | |||
137 | mov eax, [edx + IPv4_Packet.DestinationAddress] |
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138 | mov edi, BROADCAST |
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139 | mov ecx, MAX_IP+1 |
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140 | repnz scasd |
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141 | jz .ip_ok |
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142 | |||
143 | not eax |
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144 | test eax, 127 shl 24 ; 127.x.x.x |
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145 | jz .ip_ok |
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146 | |||
147 | ; TODO: we need to check for broadcasts (other then 255.255.255.255) |
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148 | |||
149 | jmp .dump |
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150 | |||
151 | .ip_ok: |
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1171 | hidnplayr | 152 | call ETH_struc2dev ; TODO: make this work on other protocols too! |
153 | inc [IP_PACKETS_RX+4*edi] |
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1159 | hidnplayr | 154 | DEBUGF 1,"IP_Handler - packet from %u.%u.%u.%u\n",\ |
155 | [edx + IPv4_Packet.SourceAddress]:1,[edx + IPv4_Packet.SourceAddress + 1]:1,[edx + IPv4_Packet.SourceAddress + 2]:1,[edx + IPv4_Packet.SourceAddress + 3]:1 |
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156 | |||
157 | mov al , [edx + IPv4_Packet.VersionAndIHL] |
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158 | and al , 0x0f ; get IHL(header length) |
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159 | cmp al , 0x05 ; IHL!= 5*4(20 bytes) |
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160 | jnz .dump ; TODO: dont dump packets wich have optional fiels !!! /!\ |
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161 | |||
162 | cmp byte [edx + IPv4_Packet.TimeToLive], 0 |
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163 | je .dump |
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164 | |||
165 | movzx eax, word [edx + IPv4_Packet.FlagsAndFragmentOffset] |
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166 | xchg al , ah |
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167 | |||
168 | test ax , 1 shl 13 ; Is 'more fragments' flag set ? |
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169 | jnz .yes_fragments ; If so, we definately have a fragmented packet |
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170 | |||
171 | test ax , 0x1fff ; If flag is not set, but there is a fragment offset, the packet is last in series of fragmented packets |
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172 | jnz .last_fragment |
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173 | |||
174 | .handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed |
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175 | movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field |
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176 | and eax, 0x0000000F ; |
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177 | shl eax, 2 ; |
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178 | |||
179 | movzx ecx, word [edx + IPv4_Packet.TotalLength] ; Calculate length of encapsulated Packet |
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180 | xchg cl , ch ; |
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181 | sub ecx, eax ; |
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182 | |||
183 | add eax, edx |
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184 | push eax |
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185 | mov al , [edx + IPv4_Packet.Protocol] |
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186 | pop edx ; Offset to data (tcp/udp/icmp/.. Packet) |
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187 | |||
188 | cmp al , IP_PROTO_TCP |
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1196 | hidnplayr | 189 | ; je TCP_handler |
1159 | hidnplayr | 190 | |
191 | cmp al , IP_PROTO_UDP |
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1196 | hidnplayr | 192 | je UDP_handler |
1159 | hidnplayr | 193 | |
194 | cmp al , IP_PROTO_ICMP |
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1196 | hidnplayr | 195 | je ICMP_handler |
1159 | hidnplayr | 196 | |
197 | DEBUGF 1,"IP_Handler - unknown protocol:%u\n",al |
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198 | |||
199 | .dump: |
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200 | DEBUGF 1,"IP_Handler - done\n" |
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201 | ; inc [dumped_rx_count] |
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202 | call kernel_free |
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203 | add esp, 4 ; pop (balance stack) |
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204 | ret |
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205 | |||
206 | |||
207 | .yes_fragments: |
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208 | shl ax , 3 |
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209 | DEBUGF 1,"Fragmented packet, offset:%u, id:%x\n", ax, [edx + IPv4_Packet.Identification]:4 |
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210 | |||
211 | test ax , ax ; Is this the first packet of the fragment? |
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212 | jnz .not_first_fragment |
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213 | |||
214 | DEBUGF 1,"First fragmented packet received!\n" |
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215 | ; try to locate a free slot.. |
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216 | mov ecx, MAX_FRAGMENTS |
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217 | mov esi, FRAGMENT_LIST |
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218 | .find_free_slot: |
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219 | cmp word [esi + FRAGMENT_slot.ttl], 0 |
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220 | je .found_free_slot |
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221 | add esi, FRAGMENT_slot.size |
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222 | loop .find_free_slot |
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223 | jmp .dump ; If no free slot was found, dump the packet |
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224 | |||
225 | .found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure |
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226 | mov word [esi + FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl |
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227 | mov ax , word [edx + IPv4_Packet.Identification] |
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228 | mov word [esi + FRAGMENT_slot.id], ax |
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229 | mov eax, dword [edx + IPv4_Packet.SourceAddress] |
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230 | mov dword [esi + FRAGMENT_slot.SrcIP], eax |
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231 | mov eax, dword [edx + IPv4_Packet.DestinationAddress] |
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232 | mov dword [esi + FRAGMENT_slot.DstIP], eax |
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233 | pop eax |
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234 | mov dword [esi + FRAGMENT_slot.ptr], eax |
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235 | ; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure |
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236 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
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237 | mov [eax + FRAGMENT_entry.PrevPtr], -1 |
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238 | mov [eax + FRAGMENT_entry.Owner], ebx |
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239 | |||
240 | add esp, 4 ; balance stack and exit |
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241 | ret |
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242 | |||
243 | |||
244 | |||
245 | .not_first_fragment: |
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246 | DEBUGF 1,"Middle fragmented packet received!\n" |
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247 | |||
248 | call .find_fragment_slot |
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249 | cmp esi, -1 |
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250 | je .dump |
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251 | |||
252 | mov word [esi + FRAGMENT_slot.ttl], 15 ; Reset the ttl |
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253 | mov esi, [esi + FRAGMENT_slot.ptr] |
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254 | or edi, -1 |
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255 | .find_last_entry: ; The following routine will try to find the last entry |
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256 | cmp edi, [esi + FRAGMENT_entry.PrevPtr] |
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257 | jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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258 | mov edi, esi |
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259 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
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260 | cmp esi, -1 |
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261 | jne .find_last_entry |
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262 | ; We found the last entry (pointer is noww in edi) |
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263 | ; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure |
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264 | |||
265 | pop eax ; pointer to packet |
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266 | mov [edi + FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry |
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267 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
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268 | mov [eax + FRAGMENT_entry.PrevPtr], edi |
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269 | mov [eax + FRAGMENT_entry.Owner], ebx |
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270 | |||
271 | add esp, 4 |
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272 | ret |
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273 | |||
274 | |||
275 | |||
276 | .last_fragment: |
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277 | DEBUGF 1,"Last fragmented packet received!\n" |
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278 | call .find_fragment_slot |
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279 | cmp esi, -1 |
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280 | je .dump |
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281 | |||
282 | 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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283 | push esi |
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284 | xor eax, eax ; |
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285 | or edi, -1 |
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286 | .count_bytes: |
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287 | cmp [esi + FRAGMENT_entry.PrevPtr], edi |
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288 | jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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289 | mov cx, word [esi + FRAGMENT_entry.Data + IPv4_Packet.TotalLength] ; Add total length |
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290 | xchg cl, ch |
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291 | DEBUGF 1,"Packet size: %u\n", cx |
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292 | add ax, cx |
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293 | movzx cx, byte [esi + FRAGMENT_entry.Data + IPv4_Packet.VersionAndIHL] ; Sub Header length |
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294 | and cx, 0x000F |
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295 | shl cx, 2 |
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296 | DEBUGF 1,"Header size: %u\n", cx |
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297 | sub ax, cx |
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298 | mov edi, esi |
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299 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
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300 | cmp esi, -1 |
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301 | jne .count_bytes |
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302 | |||
303 | mov esi, [esp+4] ;;; |
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304 | mov [edi + FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code |
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305 | mov [esi + FRAGMENT_entry.NextPtr], -1 |
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306 | mov [esi + FRAGMENT_entry.PrevPtr], edi |
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307 | mov [esi + FRAGMENT_entry.Owner], ebx |
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308 | |||
309 | mov cx, [edx + IPv4_Packet.TotalLength] ; Note: This time we dont substract Header length |
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310 | xchg cl , ch |
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311 | DEBUGF 1,"Packet size: %u\n", cx |
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312 | add ax , cx |
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313 | DEBUGF 1,"Total Received data size: %u\n", eax |
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314 | |||
315 | push eax |
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316 | mov ax , [edx + IPv4_Packet.FlagsAndFragmentOffset] |
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317 | xchg al , ah |
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318 | shl ax , 3 |
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319 | add cx , ax |
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320 | pop eax |
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321 | DEBUGF 1,"Total Fragment size: %u\n", ecx |
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322 | |||
323 | cmp ax, cx |
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324 | jne .destroy_slot_pop |
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325 | |||
326 | push eax |
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327 | push eax |
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328 | call kernel_alloc |
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329 | test eax, eax |
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330 | je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot |
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331 | mov edx, [esp+4] ; Get pointer to first fragment entry back in edx |
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332 | |||
333 | .rebuild_packet_loop: |
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334 | movzx ecx, word [edx + FRAGMENT_entry.Data + IPv4_Packet.FlagsAndFragmentOffset] ; Calculate the fragment offset |
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335 | xchg cl , ch ; intel byte order |
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336 | shl cx , 3 ; multiply by 8 and clear first 3 bits |
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337 | DEBUGF 1,"Fragment offset: %u\n", cx |
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338 | |||
339 | lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment |
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340 | movzx ebx, byte [edx + FRAGMENT_entry.Data + IPv4_Packet.VersionAndIHL] ; Find header size (in ebx) of fragment |
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341 | and bx , 0x000F ; |
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342 | shl bx , 2 ; |
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343 | |||
344 | lea esi, [edx + FRAGMENT_entry.Data] ; Set esi to the correct begin of fragment |
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345 | movzx ecx, word [edx + FRAGMENT_entry.Data + IPv4_Packet.TotalLength] ; Calculate total length of fragment |
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346 | xchg cl, ch ; intel byte order |
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347 | |||
348 | cmp edi, eax ; Is this packet the first fragment ? |
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349 | je .first_fragment |
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350 | sub cx, bx ; If not, dont copy the header |
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351 | add esi, ebx ; |
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352 | .first_fragment: |
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353 | |||
354 | push cx ; First copy dword-wise, then byte-wise |
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355 | shr cx, 2 ; |
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356 | rep movsd ; |
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357 | pop cx ; |
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358 | and cx, 3 ; |
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359 | rep movsb ; |
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360 | |||
361 | push eax |
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362 | push edx ; Push pointer to fragment onto stack |
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363 | mov edx, [edx + FRAGMENT_entry.NextPtr] ; Set edx to the next pointer |
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364 | call kernel_free ; free the previous fragment buffer (this uses the value from stack) |
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365 | pop eax |
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366 | cmp edx, -1 ; Check if it is last fragment in chain |
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367 | jne .rebuild_packet_loop |
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368 | |||
369 | pop ecx ; |
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370 | xchg cl, ch |
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371 | mov edx, eax |
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372 | mov word [edx + IPv4_Packet.TotalLength], cx |
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373 | add esp, 8 |
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374 | |||
375 | xchg cl, ch ; This prints the IP packet to the debug board (usefull when using serial output debug..) |
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376 | push ecx ;;;; |
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377 | push eax ;;;; |
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378 | ; mov esi, edx ; |
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379 | ; ; |
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380 | ; @@: ; |
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381 | ; lodsb ; |
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382 | ; DEBUGF 1,"%x ", eax:2 ; |
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383 | ; loop @r ; |
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384 | |||
385 | movzx eax, byte [edx + IPv4_Packet.VersionAndIHL] ; Calculate Header length by using IHL field |
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386 | and ax, 0x000F ; |
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387 | shl ax, 2 ; |
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388 | sub ecx, eax ; |
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389 | add eax, edx |
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390 | push eax |
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391 | mov al , [edx + IPv4_Packet.Protocol] |
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392 | pop edx ; Offset to data (tcp/udp/icmp/.. Packet) |
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393 | |||
1196 | hidnplayr | 394 | cmp al , IP_PROTO_TCP |
395 | ; je TCP_handler |
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1159 | hidnplayr | 396 | |
1171 | hidnplayr | 397 | cmp al , IP_PROTO_UDP |
1196 | hidnplayr | 398 | je UDP_handler |
1159 | hidnplayr | 399 | |
400 | cmp al , IP_PROTO_ICMP |
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1196 | hidnplayr | 401 | je ICMP_handler_fragments |
1159 | hidnplayr | 402 | |
403 | DEBUGF 1,"IP_Handler - unknown protocol:%u\n",al |
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404 | |||
1166 | hidnplayr | 405 | call kernel_free |
406 | add esp, 8 ; pop (balance stack) |
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407 | |||
1165 | hidnplayr | 408 | ret |
1159 | hidnplayr | 409 | |
410 | |||
411 | .destroy_slot_pop: |
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412 | add esp, 4 |
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413 | .destroy_slot: |
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1166 | hidnplayr | 414 | DEBUGF 1,"Destroy fragment slot!\n" |
1159 | hidnplayr | 415 | ; TODO! |
416 | jmp .dump |
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417 | |||
418 | |||
419 | |||
420 | ;----------------------------------------------------------------- |
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421 | ; |
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422 | ; find fragment slot |
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423 | ; |
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424 | ; IN: pointer to fragmented packet in edx ; TODO: the RFC says we should check protocol too |
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425 | ; OUT: pointer to slot in edi, -1 on error |
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426 | ; |
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427 | ;----------------------------------------------------------------- |
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428 | |||
429 | .find_fragment_slot: |
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430 | |||
431 | push eax ebx ecx edx |
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432 | mov ax , word [edx + IPv4_Packet.Identification] |
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433 | mov ecx, MAX_FRAGMENTS |
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434 | mov esi, FRAGMENT_LIST |
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435 | mov ebx, dword [edx + IPv4_Packet.SourceAddress] |
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436 | mov edx, dword [edx + IPv4_Packet.DestinationAddress] |
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437 | .find_slot: |
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438 | cmp word [esi + FRAGMENT_slot.id], ax |
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439 | jne .try_next |
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440 | cmp dword [esi + FRAGMENT_slot.SrcIP], ebx |
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441 | jne .try_next |
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442 | cmp dword [esi + FRAGMENT_slot.DstIP], edx |
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443 | je .found_slot |
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444 | .try_next: |
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445 | add esi, FRAGMENT_slot.size |
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446 | loop .find_slot |
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447 | ; pop edx ebx |
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448 | or esi, -1 |
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449 | ; ret |
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450 | |||
451 | .found_slot: |
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452 | pop edx ecx ebx eax |
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453 | ret |
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454 | |||
455 | |||
456 | ;----------------------------------------------------------------- |
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457 | ; |
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458 | ; Decrease TimeToLive of all fragment slots |
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459 | ; |
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460 | ; IN: / |
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461 | ; OUT: / |
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462 | ; |
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463 | ;----------------------------------------------------------------- |
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464 | |||
465 | align 4 |
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466 | IPv4_decrease_fragment_ttls: |
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467 | |||
468 | mov esi, FRAGMENT_LIST |
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469 | mov ecx, MAX_FRAGMENTS |
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470 | .loop: |
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471 | cmp [esi + FRAGMENT_slot.ttl], 0 |
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472 | je .try_next |
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473 | dec [esi + FRAGMENT_slot.ttl] |
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474 | jnz .try_next |
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475 | DEBUGF 1,"Fragment slot timed-out!\n" |
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476 | ; TODO: clear all entry's of timed-out slot |
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477 | .try_next: |
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478 | add esi, 4 |
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479 | loop .loop |
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480 | ret |
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481 | |||
482 | |||
483 | |||
484 | |||
485 | |||
486 | ;----------------------------------------------------------------- |
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487 | ; |
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488 | ; Create_IPv4_Packet |
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489 | ; |
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490 | ; IN: eax = dest ip |
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491 | ; ebx = source ip |
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492 | ; ecx = data length |
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493 | ; dx = fragment id |
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494 | ; di = protocol |
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495 | ; |
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496 | ; OUT: eax points to buffer start |
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497 | ; ebx is size of complete buffer |
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498 | ; edi = pointer to start of data (-1 on error) |
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499 | ; ecx = unchanged (packet size of embedded data) |
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500 | ; edx = pointer to device struct (needed for sending procedure) |
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501 | ; esi = pointer to sending procedure |
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502 | ; |
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503 | ;----------------------------------------------------------------- |
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504 | |||
505 | ;;; TODO: create fragmented packets |
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506 | |||
507 | align 4 |
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1196 | hidnplayr | 508 | IPv4_create_packet: |
1159 | hidnplayr | 509 | |
1206 | hidnplayr | 510 | DEBUGF 1,"Create IPv4 Packet (size=%u)\n", ecx |
1159 | hidnplayr | 511 | |
1206 | hidnplayr | 512 | cmp ecx, 1480 |
1159 | hidnplayr | 513 | jg .exit_ |
514 | |||
1206 | hidnplayr | 515 | push ecx eax ebx dx di |
516 | |||
1159 | hidnplayr | 517 | cmp eax, -1 |
518 | je .broadcast ; If it is broadcast, just send |
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519 | |||
1196 | hidnplayr | 520 | call ARP_IP_to_MAC |
1159 | hidnplayr | 521 | |
1196 | hidnplayr | 522 | cmp eax, -1 |
1206 | hidnplayr | 523 | je .not_found |
1196 | hidnplayr | 524 | |
1206 | hidnplayr | 525 | push ebx |
1196 | hidnplayr | 526 | push ax |
527 | |||
528 | jmp .send |
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529 | |||
1159 | hidnplayr | 530 | .broadcast: |
1196 | hidnplayr | 531 | push word -1 |
532 | push dword -1 |
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1159 | hidnplayr | 533 | |
534 | .send: |
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535 | call IPv4_dest_to_dev |
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1171 | hidnplayr | 536 | inc [IP_PACKETS_TX+4*edi] |
1206 | hidnplayr | 537 | mov edx, [ETH_DRV_LIST + 4*edi] |
538 | lea eax, [edx + ETH_DEVICE.mac] |
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539 | mov ebx, esp |
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540 | mov ecx, [esp+18] ;; 18 or 22 ?? |
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1159 | hidnplayr | 541 | add ecx, IPv4_Packet.DataOrOptional |
542 | mov di , ETHER_IPv4 |
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543 | call ETH_create_Packet ; TODO: figure out a way to make this work with other protocols too |
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1206 | hidnplayr | 544 | add esp, 6 |
1159 | hidnplayr | 545 | cmp edi, -1 |
546 | je .exit |
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547 | |||
548 | mov [edi + IPv4_Packet.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header) |
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549 | mov [edi + IPv4_Packet.TypeOfService], 0 |
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550 | xchg ch, cl |
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551 | mov [edi + IPv4_Packet.TotalLength], cx |
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552 | mov [edi + IPv4_Packet.FlagsAndFragmentOffset], 0x0000 |
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553 | mov [edi + IPv4_Packet.TimeToLive], 128 |
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554 | mov [edi + IPv4_Packet.HeaderChecksum], 0 |
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555 | pop cx |
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556 | mov [edi + IPv4_Packet.Protocol], cl |
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557 | pop cx |
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558 | mov [edi + IPv4_Packet.Identification], cx |
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559 | pop ecx |
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560 | mov [edi + IPv4_Packet.SourceAddress], ecx |
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561 | pop ecx |
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562 | mov [edi + IPv4_Packet.DestinationAddress], ecx |
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563 | |||
564 | push eax |
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565 | stdcall checksum_jb, edi, IPv4_Packet.DataOrOptional ; buf_ptr, buf_size |
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566 | xchg al, ah |
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567 | mov [edi + IPv4_Packet.HeaderChecksum], ax |
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568 | pop eax ecx |
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569 | add edi, IPv4_Packet.DataOrOptional |
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570 | |||
571 | DEBUGF 1,"IPv4 Packet for device %x created successfully\n", edx |
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572 | |||
573 | ret |
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574 | |||
1206 | hidnplayr | 575 | |
576 | .not_found: |
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577 | DEBUGF 1,"Create IPv4 Packet - ARP entry not found!\n" |
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578 | ; TODO: QUEUE! |
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1159 | hidnplayr | 579 | .exit: |
1206 | hidnplayr | 580 | add esp, 16 |
1159 | hidnplayr | 581 | .exit_: |
1165 | hidnplayr | 582 | DEBUGF 1,"Create IPv4 Packet - failed\n" |
1159 | hidnplayr | 583 | or edi, -1 |
584 | ret |
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585 | |||
586 | |||
587 | |||
1206 | hidnplayr | 588 | |
1159 | hidnplayr | 589 | ;--------------------------------------------------------------------------- |
590 | ; |
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591 | ; IPv4_dest_to_dev |
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592 | ; |
||
593 | ; IN: Destination IP in eax |
||
594 | ; OUT: device id in edi |
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595 | ; |
||
596 | ;--------------------------------------------------------------------------- |
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597 | |||
598 | align 4 |
||
599 | IPv4_dest_to_dev: |
||
600 | |||
601 | DEBUGF 1,"IPv4 destination to device: " |
||
602 | |||
603 | xor edi, edi |
||
604 | mov ecx, MAX_IP |
||
605 | |||
606 | .loop: |
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607 | mov ebx, [IP_LIST+edi] ; we dont need to worry about non exisiting ip interfaces |
||
608 | and ebx, [SUBNET_LIST+edi] ; they have IP and SUBNET set to all one's, so they will have no match except 255.255.255.255 |
||
609 | ; (only a moron would insert that ip into this function..) |
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610 | mov edx, eax |
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611 | and edx, [SUBNET_LIST+edi] |
||
612 | |||
613 | cmp ebx, edx |
||
614 | je .found_it |
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615 | |||
616 | add edi, 4 |
||
617 | loop .loop |
||
618 | |||
619 | xor edi, edi ; if none found, use device 0 as default device |
||
620 | |||
621 | .found_it: |
||
622 | shr edi, 2 |
||
623 | |||
624 | DEBUGF 1,"%u\n",edi |
||
625 | |||
626 | ret |
||
627 | |||
628 | |||
629 | |||
630 | ;--------------------------------------------------------------------------- |
||
631 | ; |
||
632 | ; IPv4_get_frgmnt_num |
||
633 | ; |
||
634 | ; IN: / |
||
635 | ; OUT: fragment number in ax |
||
636 | ; |
||
637 | ;--------------------------------------------------------------------------- |
||
638 | |||
639 | align 4 |
||
640 | IPv4_get_frgmnt_num: |
||
641 | xor ax, ax ;;; TODO: replace this with real code |
||
642 | |||
643 | ret |
||
644 | |||
645 | |||
646 | ;--------------------------------------------------------------------------- |
||
647 | ; |
||
648 | ; IPv4_API |
||
649 | ; |
||
650 | ; This function is called by system function 75 |
||
651 | ; |
||
652 | ; IN: subfunction number in bl |
||
653 | ; device number in bh |
||
654 | ; ecx, edx, .. depends on subfunction |
||
655 | ; |
||
656 | ; OUT: |
||
657 | ; |
||
658 | ;--------------------------------------------------------------------------- |
||
659 | |||
660 | align 4 |
||
661 | IPv4_API: |
||
662 | |||
663 | movzx eax, bh |
||
664 | shl eax, 2 |
||
665 | |||
666 | test bl, bl |
||
667 | jz .packets_tx ; 0 |
||
668 | dec bl |
||
669 | jz .packets_rx ; 1 |
||
670 | dec bl |
||
671 | jz .read_ip ; 2 |
||
672 | dec bl |
||
673 | jz .write_ip ; 3 |
||
674 | dec bl |
||
675 | jz .read_dns ; 4 |
||
676 | dec bl |
||
677 | jz .write_dns ; 5 |
||
678 | dec bl |
||
679 | jz .read_subnet ; 6 |
||
680 | dec bl |
||
681 | jz .write_subnet ; 7 |
||
682 | dec bl |
||
683 | jz .read_gateway ; 8 |
||
684 | dec bl |
||
685 | jz .write_gateway ; 9 |
||
686 | |||
687 | .error: |
||
688 | mov eax, -1 |
||
689 | ret |
||
690 | |||
691 | .packets_tx: |
||
692 | add eax, IP_PACKETS_TX |
||
693 | mov eax, [eax] |
||
694 | ret |
||
695 | |||
696 | .packets_rx: |
||
697 | add eax, IP_PACKETS_RX |
||
698 | mov eax, [eax] |
||
699 | ret |
||
700 | |||
701 | .read_ip: |
||
702 | add eax, IP_LIST |
||
703 | mov eax, [eax] |
||
704 | ret |
||
705 | |||
706 | .write_ip: |
||
707 | add eax, IP_LIST |
||
708 | mov [eax], ecx |
||
709 | xor eax, eax |
||
710 | ret |
||
711 | |||
712 | .read_dns: |
||
713 | add eax, DNS_LIST |
||
714 | mov eax, [eax] |
||
715 | ret |
||
716 | |||
717 | .write_dns: |
||
718 | add eax, DNS_LIST |
||
719 | mov [eax], ecx |
||
720 | xor eax, eax |
||
721 | ret |
||
722 | |||
723 | .read_subnet: |
||
724 | add eax, SUBNET_LIST |
||
725 | mov eax, [eax] |
||
726 | ret |
||
727 | |||
728 | .write_subnet: |
||
729 | add eax, SUBNET_LIST |
||
730 | mov [eax], ecx |
||
731 | xor eax, eax |
||
732 | ret |
||
733 | |||
734 | .read_gateway: |
||
735 | add eax, GATEWAY_LIST |
||
736 | mov eax, [eax] |
||
737 | ret |
||
738 | |||
739 | .write_gateway: |
||
740 | add eax, GATEWAY_LIST |
||
741 | mov [eax], ecx |
||
742 | xor eax, eax |
||
743 | ret |
||
744 |