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Rev | Author | Line No. | Line |
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1159 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2008. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;; ARP.INC ;; |
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7 | ;; ;; |
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8 | ;; Address Resolution Protocol ;; |
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9 | ;; ;; |
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10 | ;; This file contains the following: ;; |
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11 | ;; arp_table_manager - Manages an ARPTable ;; |
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12 | ;; arp_request - Sends an ARP request on the ethernet ;; |
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13 | ;; arp_handler - Called when an ARP packet is received ;; |
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14 | ;; ;; |
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15 | ;; Changes history: ;; |
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16 | ;; 22.09.2003 - [Mike Hibbett] : mikeh@oceanfree.net ;; |
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17 | ;; 11.11.2006 - [Johnny_B] and [smb] ;; |
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18 | ;; ;; |
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19 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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20 | |||
21 | $Revision: 983 $ |
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22 | |||
23 | |||
24 | ARP_NO_ENTRY equ 0 |
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25 | ARP_VALID_MAPPING equ 1 |
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26 | ARP_AWAITING_RESPONSE equ 2 |
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27 | ARP_RESPONSE_TIMEOUT equ 3 |
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28 | |||
29 | ETHER_ARP equ 0x0608 |
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30 | |||
31 | ARP_REQ_OPCODE equ 0x0100 ; request |
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32 | ARP_REP_OPCODE equ 0x0200 ; reply |
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33 | |||
34 | ARP_TABLE_SIZE equ 20 ; Size of table |
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35 | |||
36 | struct ARP_ENTRY |
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37 | .IP dd ? |
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38 | .MAC dp ? |
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39 | .Status dw ? |
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40 | .TTL dw ? ; in seconds |
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41 | .size: |
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42 | ends |
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43 | |||
44 | struct ARP_Packet |
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45 | .HardwareType dw ? |
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46 | .ProtocolType dw ? |
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47 | .HardwareSize db ? |
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48 | .ProtocolSize db ? |
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49 | .Opcode dw ? |
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50 | .SenderMAC dp ? |
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51 | .SenderIP dd ? |
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52 | .TargetMAC dp ? |
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53 | .TargetIP dd ? |
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54 | ends |
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55 | |||
56 | |||
57 | ; The TTL field is decremented every second, and is deleted when it |
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58 | ; reaches 0. It is refreshed every time a packet is received |
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59 | ; If the TTL field is 0xFFFF it is a static entry and is never deleted |
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60 | ; The status field can be the following values: |
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61 | ; 0x0000 entry not used |
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62 | ; 0x0001 entry holds a valid mapping |
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63 | ; 0x0002 entry contains an IP address, awaiting ARP response |
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64 | ; 0x0003 No response received to ARP request. |
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65 | ; The last status value is provided to allow the network layer to delete |
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66 | ; a packet that is queued awaiting an ARP response |
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67 | |||
68 | align 4 |
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69 | uglobal |
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70 | |||
71 | NumARP dd ? |
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72 | ARPTable rb ARP_ENTRY.size * ARP_TABLE_SIZE |
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73 | |||
74 | ARP_PACKETS_TX rd MAX_NET_DEVICES |
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75 | ARP_PACKETS_RX rd MAX_NET_DEVICES |
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76 | |||
77 | |||
78 | endg |
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79 | |||
80 | |||
81 | |||
82 | |||
83 | ARP_init: |
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84 | |||
85 | xor eax, eax |
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86 | |||
87 | mov [NumARP], eax |
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88 | |||
89 | mov edi, ARP_PACKETS_TX |
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90 | mov ecx, 2*MAX_NET_DEVICES |
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91 | rep stosd |
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92 | |||
93 | ret |
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94 | |||
95 | |||
96 | |||
97 | |||
98 | ;*************************************************************************** |
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99 | ; Function |
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100 | ; arp_table_manager [by Johnny_B] |
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101 | ; |
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102 | ; Description |
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103 | ; Does a most required operations with ARP-table |
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104 | ; IN: |
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105 | ; Operation: see Opcode's constants below |
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106 | ; Index: Index of entry in the ARP-table |
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107 | ; Extra: Extra parameter for some Opcodes |
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108 | ; OUT: |
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109 | ; EAX = Returned value depends on opcodes, more detailed see below |
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110 | ; |
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111 | ;*************************************************************************** |
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112 | ;Opcode's constants |
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113 | ARP_TABLE_ADD equ 1 |
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114 | ARP_TABLE_IP_TO_MAC equ 5 |
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115 | |||
116 | ;Index's constants |
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117 | EXTRA_IS_ARP_PACKET_PTR equ 0 ;if Extra contain pointer to ARP_Packet |
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118 | EXTRA_IS_ARP_ENTRY_PTR equ -1 ;if Extra contain pointer to ARP_ENTRY |
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119 | |||
120 | align 4 |
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121 | proc arp_table_manager stdcall uses ebx esi edi ecx edx, Opcode:DWORD,Index:DWORD,Extra:DWORD |
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122 | |||
123 | mov ebx, ARPTable ;ARPTable base |
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124 | mov ecx, dword[NumARP] ;ARP-entries counter |
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125 | |||
126 | mov eax, dword[Opcode] |
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127 | |||
128 | |||
129 | DEBUGF 1,"ARP table manager opcode:%u numARP:%u\n",eax,ecx |
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130 | |||
131 | cmp eax, ARP_TABLE_ADD |
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132 | je .add |
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1187 | hidnplayr | 133 | |
1159 | hidnplayr | 134 | cmp eax, ARP_TABLE_IP_TO_MAC |
135 | je .ip_to_mac |
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1187 | hidnplayr | 136 | |
1159 | hidnplayr | 137 | jmp .exit ;if unknown opcode |
138 | |||
139 | |||
140 | ;;BEGIN ADD |
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141 | ;;Description: it adds an entry in the table. If ARP-table already |
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142 | ;; contains same IP, it will be updated. |
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143 | ;;IN: Operation: ARP_TABLE_ADD |
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144 | ;; Index: specifies what contains Extra-parameter |
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145 | ;; Extra: if Index==EXTRA_IS_ARP_Packet_PTR, |
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146 | ;; then Extra contains pointer to ARP_Packet, |
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147 | ;; otherwise Extra contains pointer to ARP_ENTRY |
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148 | ;;OUT: |
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149 | ;; EAX=index of entry, that has been added |
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150 | ;; |
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151 | .add: |
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152 | |||
153 | DEBUGF 1,"1" |
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154 | |||
155 | sub esp, ARP_ENTRY.size ;Allocate ARP_ENTRY_SIZE byte in stack |
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156 | |||
157 | mov esi, [Extra] ;pointer |
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158 | mov edi, [Index] ;opcode |
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159 | |||
160 | cmp edi, EXTRA_IS_ARP_PACKET_PTR |
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161 | je .ARP_Packet_to_entry ;if Extra contain ptr to ARP_Packet and we have to form arp-entry |
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162 | ;else it contain ptr to arp-entry |
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163 | |||
164 | DEBUGF 1,"2" |
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165 | |||
166 | cld |
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167 | ; esi already has been loaded |
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168 | mov edi, esp ;ebx + eax=ARPTable_base + ARP-entry_base(where we will add) |
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169 | mov ecx,ARP_ENTRY.size/2 ;ARP_ENTRY_SIZE must be even number!!! |
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170 | rep movsw ;copy |
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171 | jmp .search |
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172 | |||
173 | .ARP_Packet_to_entry: |
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174 | |||
175 | DEBUGF 1,"3" |
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176 | mov edx, dword[esi + ARP_Packet.SenderIP] ;esi=base of ARP_Packet |
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177 | mov [esp + ARP_ENTRY.IP], edx |
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178 | |||
179 | cld |
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180 | lea esi, [esi + ARP_Packet.SenderMAC] |
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181 | lea edi, [esp + ARP_ENTRY.MAC] |
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182 | movsd |
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183 | movsw |
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184 | mov word[esp + ARP_ENTRY.Status], ARP_VALID_MAPPING ; specify the type - a valid entry |
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185 | mov word[esp + ARP_ENTRY.TTL], 0x0E10 ; = 1 hour |
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186 | |||
187 | .search: |
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188 | |||
189 | DEBUGF 1,"4" |
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190 | mov edx, dword[esp + ARP_ENTRY.IP] ;edx=IP-address, which we'll search |
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191 | mov ecx, dword[NumARP] ;ecx=ARP-entries counter |
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192 | jecxz .add_to_end ;if ARP-entries number == 0 |
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193 | imul eax, ecx, ARP_ENTRY.size ;eax=current table size(in bytes) |
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194 | @@: |
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195 | sub eax, ARP_ENTRY.size |
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196 | cmp dword[ebx + eax + ARP_ENTRY.IP], edx |
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197 | loopnz @b |
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198 | ; jz .replace ; found, replace existing entry, ptr to it is in eax |
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199 | |||
1162 | hidnplayr | 200 | .add_to_end: |
1159 | hidnplayr | 201 | ; |
202 | ; DEBUGF 1,"5\n" |
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203 | ; ;else add to end |
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204 | ; or eax,-1 ;set eax=0xFFFFFFFF if adding is impossible |
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205 | ; mov ecx, dword[NumARP] |
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206 | ; cmp ecx, ARP_TABLE_SIZE |
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207 | ; je .add_exit ;if arp-entries number is equal to arp-table maxsize |
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208 | |||
209 | ; imul eax, dword[NumARP], ARP_ENTRY.size ;eax=ptr to end of ARPTable |
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210 | ; inc dword [NumARP] ;increase ARP-entries counter |
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211 | |||
212 | ; .replace: |
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213 | DEBUGF 1,"Updating ARP entry: %x-%x-%x-%x-%x-%x = %u.%u.%u.%u to slot:%u\n",\ |
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214 | [esp + ARP_ENTRY.MAC]:2,[esp + ARP_ENTRY.MAC+1]:2,[esp + ARP_ENTRY.MAC+2]:2,[esp + ARP_ENTRY.MAC+3]:2,[esp + ARP_ENTRY.MAC+4]:2,[esp + ARP_ENTRY.MAC+5]:2,\ |
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215 | [esp + ARP_ENTRY.IP]:1,[esp + ARP_ENTRY.IP+1]:1,[esp + ARP_ENTRY.IP+2]:1,[esp + ARP_ENTRY.IP+3]:1,eax |
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216 | |||
217 | cld |
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218 | mov esi, esp ;esp=base of ARP-entry, that will be added |
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219 | lea edi, [ebx + eax] ;ebx + eax=ARPTable_base + ARP-entry_base(where we will add) |
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220 | mov ecx,ARP_ENTRY.size/2 ;ARP_ENTRY_SIZE must be even number!!! |
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221 | rep movsw |
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222 | |||
223 | mov ecx, ARP_ENTRY.size |
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224 | xor edx, edx ;"div" takes operand from EDX:EAX |
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225 | div ecx ;eax=index of entry, which has been added |
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226 | |||
227 | |||
228 | |||
229 | .add_exit: |
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230 | |||
231 | add esp, ARP_ENTRY.size ;free stack |
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232 | jmp .exit |
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233 | ;;END ADD |
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234 | |||
235 | |||
236 | |||
237 | ;;BEGIN IP_TO_MAC |
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238 | ;;Description: it gets an IP from Index, scans each entry in the table and writes |
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239 | ;; MAC, that relates to specified IP, into buffer specified in Extra. |
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240 | ;; And if it cannot find an IP-address in the table, it does an ARP-request of that. |
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241 | ;;IN: Operation: ARP_TABLE_IP_TO_MAC |
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242 | ;; Index: IP that should be transformed into MAC |
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243 | ;; Extra: pointer to buffer where will be written the MAC-address. |
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244 | ;;OUT: |
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245 | ;; EAX=ARP table entry status code. |
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246 | ;; If EAX==ARP_NO_ENTRY, IP isn't found in the table and we have sent the request. |
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247 | ;; If EAX==ARP_AWAITING_RESPONSE, we wait the response from remote system. |
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248 | ;; If EAX==ARP_RESPONSE_TIMEOUT, remote system not responds too long. |
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249 | ;; If EAX==ARP_VALID_MAPPING, all is ok, we've got a true MAC. |
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250 | ;; |
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251 | ;; If MAC will equal to a zero, in the buffer. It means, that IP-address was not yet |
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252 | ;; resolved, or that doesn't exist. I recommend you, to do at most 3-5 calls of this |
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253 | ;; function with 1sec delay. sure, only if it not return a valid MAC after a first call. |
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254 | ;; |
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255 | .ip_to_mac: |
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256 | |||
257 | DEBUGF 1,"Trying to find MAC for %u.%u.%u.%u\n",[Index]:1,[Index+1]:1,[Index+2]:1,[Index+3]:1 |
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258 | |||
259 | xor eax, eax |
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260 | mov edi, dword[Extra] |
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261 | cld |
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262 | stosd |
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263 | stosw |
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264 | |||
265 | |||
266 | ; first, check destination IP to see if it is on 'this' network. |
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267 | ; The test is: |
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268 | ; if ( destIP & subnet_mask == stack_ip & subnet_mask ) |
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269 | ; destination is local |
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270 | ; else |
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271 | ; destination is remote, so pass to gateway |
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272 | |||
273 | |||
274 | ;;; TODO: get device number ! (in edx) |
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275 | xor edx, edx |
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276 | |||
277 | mov eax, [Index] ;eax=required IP |
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278 | mov esi, eax |
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279 | and esi, [SUBNET_LIST+edx] |
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280 | mov ecx, [IP_LIST+edx] |
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281 | and ecx, [SUBNET_LIST+edx] |
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282 | cmp esi, ecx |
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283 | je @f ;if we and target IP are located in the same network |
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284 | mov eax, [GATEWAY_LIST+edx] |
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285 | mov [Index], eax |
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286 | DEBUGF 1,"IP is not on subnet, using %u.%u.%u.%u instead\n",[Index]:1,[Index+1]:1,[Index+2]:1,[Index+3]:1 |
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287 | @@: |
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288 | |||
289 | cmp dword[NumARP], 0 |
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290 | je .ip_to_mac_send_request ;if ARP-table not contain an entries, we have to request IP. |
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291 | ;EAX will be containing a zero, it's equal to ARP_NO_ENTRY |
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292 | |||
293 | mov ecx, dword[NumARP] |
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294 | imul esi, ecx, ARP_ENTRY.size ;esi=current ARP-table size |
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295 | |||
296 | @@: |
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297 | sub esi, ARP_ENTRY.size |
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298 | cmp [ebx + esi + ARP_ENTRY.IP], eax ; ebx=ARPTable base |
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299 | loopnz @b ; Return back if non match |
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300 | jnz .ip_to_mac_send_request ; and request IP->MAC if none found in the table |
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301 | |||
302 | ; Return the entry status in eax |
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303 | movzx eax, word[ebx + esi + ARP_ENTRY.Status] |
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304 | |||
305 | DEBUGF 1,"MAC found: %x-%x-%x-%x-%x-%x status:%x in slot:%u\n",\ |
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306 | [ebx + esi + ARP_ENTRY.MAC]:2,[ebx + esi + ARP_ENTRY.MAC+1]:2,[ebx + esi + ARP_ENTRY.MAC+2]:2,[ebx + esi + ARP_ENTRY.MAC+3]:2,[ebx + esi + ARP_ENTRY.MAC+4]:2,[ebx + esi + ARP_ENTRY.MAC+5]:2, ax, esi |
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307 | |||
308 | ; esi holds index |
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309 | cld |
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310 | lea esi, [ebx + esi + ARP_ENTRY.MAC] |
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311 | mov edi, [Extra] ;edi=ptr to buffer for write MAC |
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312 | movsd |
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313 | movsw |
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314 | jmp .exit |
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315 | |||
316 | .ip_to_mac_send_request: |
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317 | ;;; TODO: get device number ! (in edx) |
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318 | xor edx, edx |
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319 | mov edx, [ETH_DRV_LIST + 4*edx] |
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320 | lea ecx, [edx + ETH_DEVICE.mac] |
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321 | |||
322 | stdcall arp_request,[Index],[IP_LIST+edx],ecx ;TargetIP,SenderIP_ptr,SenderMAC_ptr |
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323 | mov eax, ARP_NO_ENTRY |
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324 | jmp .exit |
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325 | |||
326 | ;;END IP_TO_MAC |
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327 | |||
328 | .exit: |
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329 | ret |
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330 | endp |
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331 | |||
332 | |||
333 | ;*************************************************************************** |
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334 | ; Function |
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335 | ; arp_request [by Johnny_B] |
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336 | ; |
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337 | ; Description |
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338 | ; Sends an ARP request on the ethernet |
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339 | ; IN: |
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340 | ; TargetIP : requested IP address |
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341 | ; SenderIP_ptr : POINTER to sender's IP address(our system's address) |
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342 | ; SenderMAC_ptr : POINTER to sender's MAC address(our system's address) |
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343 | ; OUT: |
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344 | ; EAX=0 (if all is ok), otherwise EAX is not defined |
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345 | ; |
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346 | ; EBX,ESI,EDI will be saved |
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347 | ; |
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348 | ;*************************************************************************** |
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349 | proc arp_request stdcall uses ebx esi edi,\ |
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350 | TargetIP:DWORD, SenderIP_ptr:DWORD, SenderMAC_ptr:DWORD |
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351 | |||
352 | DEBUGF 1,"Create ARP request\n" |
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353 | |||
354 | |||
355 | stdcall kernel_alloc, 60 ; minimum eth packet size |
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356 | test eax, eax |
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357 | jz .exit |
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358 | |||
359 | mov ebx, eax |
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360 | |||
361 | mov word [ebx + ETH_FRAME.Data + ARP_Packet.HardwareType], 0x0100 ;Ethernet |
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362 | mov word [ebx + ETH_FRAME.Data + ARP_Packet.ProtocolType], 0x0008 ;IP |
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363 | mov byte [ebx + ETH_FRAME.Data + ARP_Packet.HardwareSize], 0x06 ;MAC-addr length |
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364 | mov byte [ebx + ETH_FRAME.Data + ARP_Packet.ProtocolSize], 0x04 ;IP-addr length |
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365 | mov word [ebx + ETH_FRAME.Data + ARP_Packet.Opcode], 0x0100 ;Request |
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366 | |||
367 | DEBUGF 1,"1" |
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368 | |||
369 | cld |
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370 | mov esi, [SenderMAC_ptr] |
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371 | lea edi, [ebx + ETH_FRAME.Data + ARP_Packet.SenderMAC] ;Our MAC-addr |
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372 | movsd |
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373 | movsw |
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374 | |||
375 | DEBUGF 1,"2" |
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376 | |||
377 | mov esi, [SenderIP_ptr] |
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378 | mov [ebx + ETH_FRAME.Data + ARP_Packet.SenderIP], esi ;Our IP-addr |
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379 | ; movsd |
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380 | |||
381 | DEBUGF 1,"3" |
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382 | |||
383 | lea edi, [ebx + ETH_FRAME.Data + ARP_Packet.TargetMAC] ; Required MAC-addr |
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384 | xor eax, eax |
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385 | stosd |
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386 | stosw |
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387 | |||
388 | DEBUGF 1,"4" |
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389 | |||
390 | lea edi, [ebx + ETH_FRAME.DstMAC] |
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391 | stosd |
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392 | stosw |
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393 | |||
394 | DEBUGF 1,"5" |
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395 | |||
396 | mov esi, [TargetIP] |
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397 | mov dword [ebx + ETH_FRAME.Data + ARP_Packet.TargetIP], esi ;Required IP-addr(we get it as function parameter) |
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398 | |||
399 | |||
400 | DEBUGF 1,"6" |
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401 | |||
402 | mov esi, [SenderMAC_ptr] |
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403 | lea edi, [ebx + ETH_FRAME.SrcMAC] |
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404 | movsd |
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405 | movsw |
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406 | |||
407 | DEBUGF 1,"7" |
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408 | |||
409 | mov ax , ETHER_ARP |
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410 | stosw |
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411 | |||
412 | DEBUGF 1,"8" |
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413 | |||
414 | ;;; TODO: get device number in edx !! |
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415 | xor edx, edx |
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416 | shl edx, 2 |
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417 | |||
1171 | hidnplayr | 418 | inc [ARP_PACKETS_TX+edx] |
419 | |||
1159 | hidnplayr | 420 | push dword .returnaddr |
421 | push dword 60 |
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422 | push ebx |
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423 | mov ebx, [ETH_DRV_LIST + edx] |
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424 | jmp [ebx + ETH_DEVICE.transmit] |
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425 | .returnaddr: |
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426 | |||
427 | ; Add an entry in the ARP table, awaiting response |
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428 | sub esp, ARP_ENTRY.size ;allocate memory for ARP-entry |
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429 | |||
430 | mov esi, dword[TargetIP] |
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431 | mov dword[esp + ARP_ENTRY.IP],esi |
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432 | |||
433 | lea edi, [esp + ARP_ENTRY.MAC] |
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434 | xor eax, eax |
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435 | stosd |
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436 | stosw |
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437 | |||
438 | mov word[esp + ARP_ENTRY.Status], ARP_AWAITING_RESPONSE |
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439 | mov word[esp + ARP_ENTRY.TTL], 10 ; 10 seconds |
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440 | |||
441 | stdcall arp_table_manager,ARP_TABLE_ADD,EXTRA_IS_ARP_ENTRY_PTR,esp |
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442 | add esp, ARP_ENTRY.size ; free memory |
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443 | |||
444 | .exit: |
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445 | |||
446 | DEBUGF 1,"ARP request - end\n" |
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447 | ret |
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448 | endp |
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449 | |||
450 | |||
451 | |||
452 | |||
453 | |||
1185 | hidnplayr | 454 | ;--------------------------------------------------------------------------- |
455 | ; |
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456 | ; ARP_decrease_entry_ttls |
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457 | ; |
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458 | ; IN: / |
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459 | ; OUT: / |
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460 | ; |
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461 | ;--------------------------------------------------------------------------- |
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462 | |||
463 | align 4 |
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464 | ARP_decrease_entry_ttls: |
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465 | |||
466 | mov ecx, [NumARP] |
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467 | test ecx, ecx |
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468 | jz .exit |
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469 | |||
470 | mov ebx, ARPTable |
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471 | |||
472 | .timer_loop: |
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473 | |||
474 | movsx esi, word [ebx + ARP_ENTRY.TTL] |
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475 | cmp esi, 0xFFFFFFFF |
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476 | je .timer_loop_end ;if TTL==0xFFFF then it's static entry |
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477 | |||
478 | test esi, esi |
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479 | jnz .timer_loop_end_with_dec ;if TTL!=0 |
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480 | |||
481 | ; Ok, TTL is 0 |
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482 | ;if Status==AWAITING_RESPONSE and TTL==0 |
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483 | ;then we have to change it to ARP_RESPONSE_TIMEOUT |
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484 | cmp word [ebx + ARP_ENTRY.Status], ARP_AWAITING_RESPONSE |
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485 | jne @f |
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486 | |||
487 | mov word [ebx + ARP_ENTRY.Status], ARP_RESPONSE_TIMEOUT |
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488 | mov word [ebx + ARP_ENTRY.TTL], word 0x000A ;10 sec |
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489 | jmp .timer_loop_end |
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490 | |||
491 | @@: |
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492 | ;if TTL==0 and Status==VALID_MAPPING, we have to delete it |
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493 | ;if TTL==0 and Status==RESPONSE_TIMEOUT, delete too |
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494 | mov esi, dword[NumARP] |
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495 | sub esi, ecx ;esi=index of entry, will be deleted |
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496 | |||
497 | call ARP_del_entry |
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498 | |||
499 | jmp .timer_loop_end |
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500 | |||
501 | |||
502 | .timer_loop_end_with_dec: |
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503 | |||
504 | dec word [ebx + ARP_ENTRY.TTL] ;decrease TTL |
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505 | |||
506 | .timer_loop_end: |
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507 | |||
508 | add ebx, ARP_ENTRY.size |
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509 | loop .timer_loop |
||
510 | |||
511 | .exit: |
||
512 | |||
513 | ret |
||
514 | |||
515 | |||
516 | ;--------------------------------------------------------------------------- |
||
517 | ; |
||
518 | ; ARP_del_entry |
||
519 | ; |
||
520 | ; IN: entry # in esi |
||
521 | ; OUT: / |
||
522 | ; |
||
523 | ;--------------------------------------------------------------------------- |
||
524 | |||
525 | align 4 |
||
526 | ARP_del_entry: |
||
527 | |||
528 | imul esi, ARP_ENTRY.size |
||
529 | |||
530 | mov ecx, (ARP_TABLE_SIZE - 1) * ARP_ENTRY.size |
||
531 | sub ecx, esi |
||
532 | |||
533 | lea edi, [ebx + esi] ;edi=ptr to entry that should be deleted |
||
534 | lea esi, [edi + ARP_ENTRY.size] ;esi=ptr to next entry |
||
535 | |||
536 | shr ecx,1 ;ecx/2 => ARP_ENTRY_SIZE MUST BE EVEN NUMBER! |
||
537 | cld |
||
538 | rep movsw |
||
539 | |||
540 | dec dword[NumARP] ;decrease arp-entries counter |
||
541 | ret |
||
542 | |||
543 | |||
544 | |||
545 | |||
546 | |||
1159 | hidnplayr | 547 | ;----------------------------------------------------- |
548 | ; |
||
549 | ; ARP_Handler: |
||
550 | ; |
||
551 | ; This function handles ARP protocol over ethernet |
||
552 | ; (other protocols may follow in the future) |
||
553 | ; |
||
554 | ; IN: Pointer to buffer in [esp] |
||
555 | ; size of buffer in [esp+4] |
||
556 | ; packet size (without ethernet header) in ecx |
||
557 | ; OUT: / |
||
558 | ; |
||
559 | ;----------------------------------------------------- |
||
560 | align 4 |
||
561 | ARP_Handler: |
||
562 | |||
563 | DEBUGF 1,"ARP_Handler - start\n" |
||
564 | cmp ecx, 28 |
||
565 | jl .exit |
||
566 | |||
567 | ; Is this a REQUEST? |
||
568 | ; Is this a request for My Host IP |
||
569 | ; Yes - So construct a response message. |
||
570 | ; Send this message to the ethernet card for transmission |
||
571 | |||
572 | ; push ebx edx |
||
573 | stdcall arp_table_manager, ARP_TABLE_ADD, EXTRA_IS_ARP_PACKET_PTR, edx |
||
574 | ; pop edx ebx |
||
575 | |||
576 | cmp word [edx + ARP_Packet.Opcode], ARP_REQ_OPCODE ; Is this a request packet? |
||
577 | jne .exit |
||
578 | |||
579 | call ETH_struc2dev |
||
1171 | hidnplayr | 580 | DEBUGF 1,"ARP Packet came from device: %u\n", edi |
581 | inc [ARP_PACKETS_RX+4*edi] |
||
1159 | hidnplayr | 582 | cmp edi, -1 |
583 | jz .exit |
||
584 | |||
585 | mov eax, edi |
||
586 | shl eax, 2 |
||
587 | add eax, IP_LIST |
||
588 | mov eax, [eax] |
||
589 | cmp eax, [edx + ARP_Packet.TargetIP] ; Is it looking for my IP address? |
||
590 | jnz .exit |
||
591 | push eax |
||
592 | push edi |
||
593 | |||
594 | ; DEBUGF 1,"ETH_ARP_Handler - request for %u.%u.%u.%u\n",[edi+0]:1,[edi+1]:1,[edi+2]:1,[edi+3]:1 |
||
595 | |||
596 | ; OK, it is a request for one of our MAC addresses. Build the frame and send it |
||
597 | ; We can reuse the buffer. |
||
598 | |||
599 | cld |
||
600 | lea esi, [edx + ARP_Packet.SenderMAC] |
||
601 | lea edi, [edx + ARP_Packet.TargetMAC] |
||
602 | movsd ; Move Sender Mac to Dest MAC |
||
603 | movsw ; |
||
604 | movsd ; Move sender IP to Dest IP |
||
605 | |||
606 | pop esi |
||
607 | mov esi, [ETH_DRV_LIST + 4*esi] |
||
608 | lea esi, [esi + ETH_DEVICE.mac] |
||
609 | lea edi, [edx + ARP_Packet.SenderMAC] |
||
610 | movsd ; Copy MAC address from in MAC_LIST |
||
611 | movsw ; |
||
612 | pop eax |
||
613 | stosd ; Write our IP |
||
614 | |||
615 | mov word [edx + ARP_Packet.Opcode], ARP_REP_OPCODE |
||
616 | |||
617 | ; Now, Fill in ETHERNET header |
||
618 | |||
619 | mov edi, [esp] |
||
620 | lea esi, [edx + ARP_Packet.TargetMAC] |
||
621 | movsd |
||
622 | movsw |
||
623 | lea esi, [edx + ARP_Packet.SenderMAC] |
||
624 | movsd |
||
625 | movsw |
||
626 | mov ax , ETHER_ARP |
||
627 | stosw |
||
628 | |||
629 | jmp ETH_Sender ; And send it! |
||
630 | |||
631 | .exit: |
||
632 | call kernel_free |
||
633 | add esp, 4 ; pop (balance stack) |
||
634 | |||
635 | DEBUGF 1,"ARP_Handler - fail\n" |
||
636 | ret |
||
637 | |||
638 | |||
639 | |||
640 | |||
641 | ;--------------------------------------------------------------------------- |
||
642 | ; |
||
643 | ; ARP_API |
||
644 | ; |
||
645 | ; This function is called by system function 75 |
||
646 | ; |
||
647 | ; IN: subfunction number in bl |
||
648 | ; device number in bh |
||
649 | ; ecx, edx, .. depends on subfunction |
||
650 | ; |
||
651 | ; OUT: |
||
652 | ; |
||
653 | ;--------------------------------------------------------------------------- |
||
654 | |||
655 | align 4 |
||
656 | ARP_API: |
||
657 | |||
658 | movzx eax, bh |
||
659 | shl eax, 2 |
||
660 | |||
661 | test bl, bl |
||
662 | jz .packets_tx ; 0 |
||
663 | dec bl |
||
664 | jz .packets_rx ; 1 |
||
665 | dec bl |
||
666 | jz .entries ; 2 |
||
667 | dec bl |
||
668 | jz .read ; 3 |
||
669 | dec bl |
||
670 | jz .write ; 4 |
||
671 | dec bl |
||
672 | jz .remove ; 5 |
||
673 | dec bl |
||
674 | |||
675 | |||
676 | .error: |
||
677 | mov eax, -1 |
||
678 | ret |
||
679 | |||
680 | .packets_tx: |
||
681 | add eax, ARP_PACKETS_TX |
||
682 | mov eax, [eax] |
||
683 | ret |
||
684 | |||
685 | .packets_rx: |
||
686 | add eax, ARP_PACKETS_RX |
||
687 | mov eax, [eax] |
||
688 | ret |
||
689 | |||
690 | .entries: |
||
691 | mov eax, [NumARP] |
||
692 | ret |
||
693 | |||
694 | .read: |
||
695 | ; TODO: write code |
||
696 | ret |
||
697 | |||
698 | .write: |
||
699 | ; TODO: write code |
||
700 | ret |
||
701 | |||
702 | .remove: |
||
703 | ; TODO: write code |
||
704 | ret |
||
705 |