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1159 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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2731 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;; |
1159 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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1249 | hidnplayr | 6 | ;; IPv4.INC ;; |
1159 | hidnplayr | 7 | ;; ;; |
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: 2914 $ |
1159 | hidnplayr | 20 | |
2731 | hidnplayr | 21 | MAX_FRAGMENTS = 64 |
22 | MAX_IP = MAX_NET_DEVICES |
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23 | IP_MAX_INTERFACES = MAX_IP |
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1159 | hidnplayr | 24 | |
2308 | hidnplayr | 25 | struct IPv4_header |
2305 | hidnplayr | 26 | |
2731 | hidnplayr | 27 | VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits] |
28 | 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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29 | TotalLength dw ? |
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30 | Identification dw ? |
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31 | FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15] |
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32 | TimeToLive db ? ; |
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33 | Protocol db ? |
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34 | HeaderChecksum dw ? |
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35 | SourceAddress dd ? |
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36 | DestinationAddress dd ? |
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2305 | hidnplayr | 37 | |
1159 | hidnplayr | 38 | ends |
39 | |||
2308 | hidnplayr | 40 | struct FRAGMENT_slot |
2305 | hidnplayr | 41 | |
2731 | hidnplayr | 42 | ttl dw ? ; Time to live for this entry, 0 for empty slot's |
43 | id dw ? ; Identification field from IP header |
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44 | SrcIP dd ? ; .. from IP header |
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45 | DstIP dd ? ; .. from IP header |
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46 | ptr dd ? ; Pointer to first packet |
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2305 | hidnplayr | 47 | |
1159 | hidnplayr | 48 | ends |
49 | |||
2731 | hidnplayr | 50 | struct FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets |
2305 | hidnplayr | 51 | |
2731 | hidnplayr | 52 | PrevPtr dd ? ; Pointer to previous fragment entry (-1 for first packet) |
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 ;;; FIXME |
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56 | ; Ip header begins here (we will need the IP header to re-construct the complete packet) |
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1159 | hidnplayr | 57 | ends |
58 | |||
1529 | hidnplayr | 59 | |
1530 | hidnplayr | 60 | align 4 |
61 | uglobal |
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1529 | hidnplayr | 62 | |
2731 | hidnplayr | 63 | IP_LIST rd MAX_IP |
64 | SUBNET_LIST rd MAX_IP |
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65 | DNS_LIST rd MAX_IP |
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66 | GATEWAY_LIST rd MAX_IP |
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67 | BROADCAST_LIST rd MAX_IP |
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1529 | hidnplayr | 68 | |
2731 | hidnplayr | 69 | IP_PACKETS_TX rd MAX_IP |
70 | IP_PACKETS_RX rd MAX_IP |
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1530 | hidnplayr | 71 | |
2731 | hidnplayr | 72 | FRAGMENT_LIST rb MAX_FRAGMENTS * sizeof.FRAGMENT_slot |
1530 | 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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2308 | hidnplayr | 83 | macro IPv4_init { |
1530 | hidnplayr | 84 | |
2308 | hidnplayr | 85 | xor eax, eax |
86 | mov edi, IP_LIST |
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2731 | hidnplayr | 87 | mov ecx, 7*MAX_IP + (sizeof.FRAGMENT_slot*MAX_FRAGMENTS)/4 |
2308 | hidnplayr | 88 | rep stosd |
1530 | 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 | |||
2731 | hidnplayr | 100 | local .loop, .next |
1530 | hidnplayr | 101 | |
2308 | hidnplayr | 102 | mov esi, FRAGMENT_LIST |
103 | mov ecx, MAX_FRAGMENTS |
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1530 | hidnplayr | 104 | .loop: |
2308 | hidnplayr | 105 | cmp [esi + FRAGMENT_slot.ttl], 0 |
2731 | hidnplayr | 106 | je .next |
2308 | hidnplayr | 107 | dec [esi + FRAGMENT_slot.ttl] |
2731 | hidnplayr | 108 | jz .died |
109 | .next: |
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110 | add esi, sizeof.FRAGMENT_slot |
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111 | dec ecx |
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112 | jnz .loop |
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113 | jmp .done |
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114 | |||
115 | .died: |
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2308 | hidnplayr | 116 | DEBUGF 1,"Fragment slot timed-out!\n" |
1530 | hidnplayr | 117 | ;;; TODO: clear all entry's of timed-out slot |
2731 | hidnplayr | 118 | jmp .next |
119 | |||
120 | .done: |
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1530 | hidnplayr | 121 | } |
122 | |||
123 | |||
124 | |||
1529 | hidnplayr | 125 | macro IPv4_checksum ptr { |
126 | |||
2309 | hidnplayr | 127 | ; This is the fast procedure to create or check an IP header without options |
1529 | hidnplayr | 128 | ; To create a new checksum, the checksum field must be set to 0 before computation |
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 | |||
2308 | hidnplayr | 131 | push ebx |
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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1529 | hidnplayr | 135 | |
2308 | hidnplayr | 136 | adc bl, [ptr+3] |
137 | adc bh, [ptr+2] |
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1529 | hidnplayr | 138 | |
2308 | hidnplayr | 139 | adc bl, [ptr+5] |
140 | adc bh, [ptr+4] |
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1529 | hidnplayr | 141 | |
2308 | hidnplayr | 142 | adc bl, [ptr+7] |
143 | adc bh, [ptr+6] |
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1529 | hidnplayr | 144 | |
2308 | hidnplayr | 145 | adc bl, [ptr+9] |
146 | adc bh, [ptr+8] |
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1529 | hidnplayr | 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 | |||
2308 | hidnplayr | 150 | adc bl, [ptr+13] |
151 | adc bh, [ptr+12] |
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1529 | hidnplayr | 152 | |
2308 | hidnplayr | 153 | adc bl, [ptr+15] |
154 | adc bh, [ptr+14] |
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1529 | hidnplayr | 155 | |
2308 | hidnplayr | 156 | adc bl, [ptr+17] |
157 | adc bh, [ptr+16] |
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1529 | hidnplayr | 158 | |
2308 | hidnplayr | 159 | adc bl, [ptr+19] |
160 | adc bh, [ptr+18] |
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1529 | hidnplayr | 161 | |
2308 | hidnplayr | 162 | adc ebx, 0 |
1529 | hidnplayr | 163 | |
2308 | hidnplayr | 164 | push ecx |
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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1529 | hidnplayr | 169 | |
2308 | hidnplayr | 170 | mov ecx, ebx |
171 | shr ecx, 16 |
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172 | add ebx, ecx |
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1529 | hidnplayr | 173 | |
2308 | hidnplayr | 174 | not bx |
175 | jnz .not_zero |
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176 | dec bx |
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1529 | hidnplayr | 177 | .not_zero: |
2308 | hidnplayr | 178 | xchg bl, bh |
179 | pop ecx |
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1529 | hidnplayr | 180 | |
2308 | hidnplayr | 181 | neg word [ptr+10] ; zero will stay zero so we just get the checksum |
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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1529 | hidnplayr | 184 | |
185 | } |
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186 | |||
187 | |||
188 | |||
1159 | hidnplayr | 189 | ;----------------------------------------------------------------- |
190 | ; |
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1529 | hidnplayr | 191 | ; IPv4_input: |
1159 | hidnplayr | 192 | ; |
2731 | hidnplayr | 193 | ; Will check if IPv4 Packet isnt damaged |
1159 | hidnplayr | 194 | ; and call appropriate handler. (TCP/UDP/ICMP/..) |
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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2731 | hidnplayr | 201 | ; pointer to IPv4 header in edx |
202 | ; size of IPv4 packet in ecx |
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1159 | hidnplayr | 203 | ; OUT: / |
204 | ; |
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205 | ;----------------------------------------------------------------- |
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206 | align 4 |
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2731 | hidnplayr | 207 | IPv4_input: ; TODO: add IPv4 raw sockets support |
1159 | hidnplayr | 208 | |
2553 | hidnplayr | 209 | DEBUGF 1,"IPv4_input, packet from: %u.%u.%u.%u ",\ |
2731 | 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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2308 | hidnplayr | 212 | DEBUGF 1,"to: %u.%u.%u.%u\n",\ |
2731 | 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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1159 | hidnplayr | 215 | |
1473 | hidnplayr | 216 | ;------------------------------- |
2731 | hidnplayr | 217 | ; re-calculate the checksum |
1473 | hidnplayr | 218 | |
2308 | hidnplayr | 219 | IPv4_checksum edx |
220 | jnz .dump ; if checksum isn't valid then dump packet |
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1249 | hidnplayr | 221 | |
2891 | hidnplayr | 222 | DEBUGF 1,"IPv4_input: Checksum ok\n" |
1254 | hidnplayr | 223 | |
1514 | hidnplayr | 224 | ;----------------------------------- |
225 | ; Check if destination IP is correct |
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1473 | hidnplayr | 226 | |
2308 | hidnplayr | 227 | call NET_ptr_to_num |
228 | shl edi, 2 |
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1473 | hidnplayr | 229 | |
2308 | hidnplayr | 230 | ; check if it matches local ip |
1473 | hidnplayr | 231 | |
2731 | hidnplayr | 232 | mov eax, [edx + IPv4_header.DestinationAddress] |
233 | cmp eax, [IP_LIST+edi] |
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2308 | hidnplayr | 234 | je .ip_ok |
1159 | hidnplayr | 235 | |
2731 | hidnplayr | 236 | ; check for broadcast (IP or (not SUBNET)) |
1514 | hidnplayr | 237 | |
2731 | hidnplayr | 238 | cmp eax, [BROADCAST_LIST+edi] |
2308 | hidnplayr | 239 | je .ip_ok |
1159 | hidnplayr | 240 | |
2731 | hidnplayr | 241 | ; or a special broadcast (255.255.255.255) |
1159 | hidnplayr | 242 | |
2731 | hidnplayr | 243 | cmp eax, 0xffffffff |
2308 | hidnplayr | 244 | je .ip_ok |
1473 | hidnplayr | 245 | |
2731 | hidnplayr | 246 | ; maybe it's a multicast (224.0.0.0/4) |
1519 | hidnplayr | 247 | |
2731 | hidnplayr | 248 | and eax, 0x0fffffff |
249 | cmp eax, 224 |
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250 | je .ip_ok |
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1159 | hidnplayr | 251 | |
2731 | hidnplayr | 252 | ; or a loopback address (127.0.0.0/8) |
1473 | hidnplayr | 253 | |
2731 | hidnplayr | 254 | and eax, 0x00ffffff |
255 | cmp eax, 127 |
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2308 | hidnplayr | 256 | je .ip_ok |
1473 | hidnplayr | 257 | |
2731 | hidnplayr | 258 | ; or it's just not meant for us.. :( |
1159 | hidnplayr | 259 | |
2891 | hidnplayr | 260 | DEBUGF 2,"IPv4_input: Destination address does not match!\n" |
2308 | hidnplayr | 261 | jmp .dump |
1159 | hidnplayr | 262 | |
1514 | hidnplayr | 263 | ;------------------------ |
264 | ; Now we can update stats |
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1159 | hidnplayr | 265 | |
1514 | hidnplayr | 266 | .ip_ok: |
2308 | hidnplayr | 267 | inc [IP_PACKETS_RX+edi] |
1159 | hidnplayr | 268 | |
1473 | hidnplayr | 269 | ;---------------------------------- |
270 | ; Check if the packet is fragmented |
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1159 | hidnplayr | 271 | |
2308 | hidnplayr | 272 | test [edx + IPv4_header.FlagsAndFragmentOffset], 1 shl 5 ; Is 'more fragments' flag set ? |
273 | jnz .has_fragments ; If so, we definately have a fragmented packet |
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1159 | hidnplayr | 274 | |
2308 | hidnplayr | 275 | 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 |
276 | jnz .is_last_fragment |
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1473 | hidnplayr | 277 | |
278 | ;------------------------------------------------------------------- |
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279 | ; No, it's just a regular IP packet, pass it to the higher protocols |
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280 | |||
2308 | hidnplayr | 281 | .handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed |
1159 | hidnplayr | 282 | |
2308 | hidnplayr | 283 | movzx esi, [edx + IPv4_header.VersionAndIHL] ; Calculate Header length by using IHL field |
284 | and esi, 0x0000000f ; |
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285 | shl esi, 2 ; |
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1473 | hidnplayr | 286 | |
2308 | hidnplayr | 287 | movzx ecx, [edx + IPv4_header.TotalLength] ; Calculate length of encapsulated Packet |
2731 | hidnplayr | 288 | xchg cl, ch ; |
2308 | hidnplayr | 289 | sub ecx, esi ; |
1159 | hidnplayr | 290 | |
2308 | hidnplayr | 291 | lea edi, [edx + IPv4_header.SourceAddress] ; make edi ptr to source and dest IPv4 address |
2731 | hidnplayr | 292 | mov al, [edx + IPv4_header.Protocol] |
2310 | hidnplayr | 293 | add esi, edx ; make esi ptr to data |
1159 | hidnplayr | 294 | |
2621 | hidnplayr | 295 | cmp al, IP_PROTO_TCP |
2308 | hidnplayr | 296 | je TCP_input |
1159 | hidnplayr | 297 | |
2621 | hidnplayr | 298 | cmp al, IP_PROTO_UDP |
2308 | hidnplayr | 299 | je UDP_input |
1159 | hidnplayr | 300 | |
2621 | hidnplayr | 301 | cmp al, IP_PROTO_ICMP |
2308 | hidnplayr | 302 | je ICMP_input |
1159 | hidnplayr | 303 | |
2891 | hidnplayr | 304 | DEBUGF 2,"IPv4_input: unknown protocol %u\n", al |
2308 | hidnplayr | 305 | |
1159 | hidnplayr | 306 | .dump: |
2891 | hidnplayr | 307 | DEBUGF 2,"IPv4_input: dumping\n" |
308 | ; inc [dumped_rx_count] ;;; TODO |
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2308 | hidnplayr | 309 | call kernel_free |
310 | add esp, 4 ; pop (balance stack) |
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311 | ret |
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1159 | hidnplayr | 312 | |
313 | |||
1473 | hidnplayr | 314 | ;--------------------------- |
315 | ; Fragmented packet handler |
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316 | |||
317 | |||
318 | .has_fragments: |
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2308 | hidnplayr | 319 | movzx eax, [edx + IPv4_header.FlagsAndFragmentOffset] |
320 | xchg al , ah |
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321 | shl ax , 3 |
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1473 | hidnplayr | 322 | |
2891 | hidnplayr | 323 | DEBUGF 1,"IPv4_input: fragmented packet offset=%u id=%x\n", ax, [edx + IPv4_header.Identification]:4 |
1159 | hidnplayr | 324 | |
2308 | hidnplayr | 325 | test ax , ax ; Is this the first packet of the fragment? |
326 | jz .is_first_fragment |
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1159 | hidnplayr | 327 | |
1473 | hidnplayr | 328 | |
329 | ;------------------------------------------------------- |
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330 | ; We have a fragmented IP packet, but it's not the first |
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331 | |||
2891 | hidnplayr | 332 | DEBUGF 1,"IPv4_input: Middle fragment packet received!\n" |
1473 | hidnplayr | 333 | |
2308 | hidnplayr | 334 | call IPv4_find_fragment_slot |
335 | cmp esi, -1 |
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336 | je .dump |
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1473 | hidnplayr | 337 | |
2308 | hidnplayr | 338 | mov [esi + FRAGMENT_slot.ttl], 15 ; Reset the ttl |
339 | mov esi, [esi + FRAGMENT_slot.ptr] |
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340 | or edi, -1 |
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341 | .find_last_entry: ; The following routine will try to find the last entry |
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342 | cmp edi, [esi + FRAGMENT_entry.PrevPtr] |
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343 | jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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344 | mov edi, esi |
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345 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
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346 | cmp esi, -1 |
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347 | jne .find_last_entry |
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348 | ; We found the last entry (pointer is now in edi) |
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349 | ; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure |
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1473 | hidnplayr | 350 | |
2308 | hidnplayr | 351 | pop eax ; pointer to packet |
352 | mov [edi + FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry |
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353 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
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354 | mov [eax + FRAGMENT_entry.PrevPtr], edi |
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355 | mov [eax + FRAGMENT_entry.Owner], ebx |
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1473 | hidnplayr | 356 | |
2308 | hidnplayr | 357 | add esp, 4 |
358 | ret |
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1473 | hidnplayr | 359 | |
360 | |||
361 | ;------------------------------------ |
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362 | ; We have received the first fragment |
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363 | |||
364 | .is_first_fragment: |
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2891 | hidnplayr | 365 | DEBUGF 1,"IPv4_input: First fragment packet received!\n" |
2308 | hidnplayr | 366 | ; try to locate a free slot.. |
367 | mov ecx, MAX_FRAGMENTS |
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368 | mov esi, FRAGMENT_LIST |
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1473 | hidnplayr | 369 | .find_free_slot: |
2308 | hidnplayr | 370 | cmp word [esi + FRAGMENT_slot.ttl], 0 |
371 | je .found_free_slot |
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372 | add esi, sizeof.FRAGMENT_slot |
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373 | loop .find_free_slot |
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374 | jmp .dump ; If no free slot was found, dump the packet |
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1159 | hidnplayr | 375 | |
2308 | hidnplayr | 376 | .found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure |
377 | mov [esi + FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl |
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378 | mov ax , [edx + IPv4_header.Identification] |
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379 | mov [esi + FRAGMENT_slot.id], ax |
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380 | mov eax,[edx + IPv4_header.SourceAddress] |
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381 | mov [esi + FRAGMENT_slot.SrcIP], eax |
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382 | mov eax, [edx + IPv4_header.DestinationAddress] |
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383 | mov [esi + FRAGMENT_slot.DstIP], eax |
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384 | pop eax |
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385 | mov [esi + FRAGMENT_slot.ptr], eax |
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386 | ; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure |
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387 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
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388 | mov [eax + FRAGMENT_entry.PrevPtr], -1 |
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389 | mov [eax + FRAGMENT_entry.Owner], ebx |
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1159 | hidnplayr | 390 | |
2308 | hidnplayr | 391 | add esp, 4 ; balance stack and exit |
392 | ret |
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1159 | hidnplayr | 393 | |
394 | |||
1473 | hidnplayr | 395 | ;----------------------------------- |
396 | ; We have received the last fragment |
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1159 | hidnplayr | 397 | |
1473 | hidnplayr | 398 | .is_last_fragment: |
2891 | hidnplayr | 399 | DEBUGF 1,"IPv4_input: Last fragment packet received!\n" |
1159 | hidnplayr | 400 | |
2308 | hidnplayr | 401 | call IPv4_find_fragment_slot |
402 | cmp esi, -1 |
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403 | je .dump |
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1159 | hidnplayr | 404 | |
2308 | hidnplayr | 405 | 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 |
406 | push esi |
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407 | xor eax, eax |
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408 | or edi, -1 |
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1473 | hidnplayr | 409 | |
410 | .count_bytes: |
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2308 | hidnplayr | 411 | cmp [esi + FRAGMENT_entry.PrevPtr], edi |
412 | jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
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413 | mov cx, [esi + sizeof.FRAGMENT_entry + IPv4_header.TotalLength] ; Add total length |
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414 | xchg cl, ch |
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2891 | hidnplayr | 415 | DEBUGF 1,"IPv4_input: Packet size=%u\n", cx |
2308 | hidnplayr | 416 | add ax, cx |
417 | movzx cx, [esi + sizeof.FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Sub Header length |
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418 | and cx, 0x000F |
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419 | shl cx, 2 |
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2891 | hidnplayr | 420 | DEBUGF 1,"IPv4_input: Header size=%u\n", cx |
2308 | hidnplayr | 421 | sub ax, cx |
422 | mov edi, esi |
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423 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
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424 | cmp esi, -1 |
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425 | jne .count_bytes |
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1159 | hidnplayr | 426 | |
2308 | hidnplayr | 427 | mov esi, [esp+4] |
428 | mov [edi + FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code |
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429 | mov [esi + FRAGMENT_entry.NextPtr], -1 |
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430 | mov [esi + FRAGMENT_entry.PrevPtr], edi |
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431 | mov [esi + FRAGMENT_entry.Owner], ebx |
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1159 | hidnplayr | 432 | |
2308 | hidnplayr | 433 | mov cx, [edx + IPv4_header.TotalLength] ; Note: This time we dont substract Header length |
434 | xchg cl , ch |
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2891 | hidnplayr | 435 | DEBUGF 1,"IPv4_input: Packet size=%u\n", cx |
2308 | hidnplayr | 436 | add ax , cx |
2891 | hidnplayr | 437 | DEBUGF 1,"IPv4_input: Total Received data size=%u\n", eax |
1159 | hidnplayr | 438 | |
2308 | hidnplayr | 439 | push eax |
440 | mov ax , [edx + IPv4_header.FlagsAndFragmentOffset] |
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441 | xchg al , ah |
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442 | shl ax , 3 |
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443 | add cx , ax |
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444 | pop eax |
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2891 | hidnplayr | 445 | DEBUGF 1,"IPv4_input: Total Fragment size=%u\n", ecx |
1159 | hidnplayr | 446 | |
2308 | hidnplayr | 447 | cmp ax, cx |
448 | jne .destroy_slot_pop |
||
1159 | hidnplayr | 449 | |
2308 | hidnplayr | 450 | push eax |
451 | push eax |
||
452 | call kernel_alloc |
||
453 | test eax, eax |
||
454 | je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot |
||
455 | mov edx, [esp+4] ; Get pointer to first fragment entry back in edx |
||
1159 | hidnplayr | 456 | |
1473 | hidnplayr | 457 | .rebuild_packet_loop: |
2308 | hidnplayr | 458 | movzx ecx, [edx + sizeof.FRAGMENT_entry + IPv4_header.FlagsAndFragmentOffset] ; Calculate the fragment offset |
459 | xchg cl , ch ; intel byte order |
||
460 | shl cx , 3 ; multiply by 8 and clear first 3 bits |
||
2891 | hidnplayr | 461 | DEBUGF 1,"IPv4_input: Fragment offset=%u\n", cx |
1159 | hidnplayr | 462 | |
2308 | hidnplayr | 463 | lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment |
464 | movzx ebx, [edx + sizeof.FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment |
||
465 | and bx , 0x000F ; |
||
466 | shl bx , 2 ; |
||
1159 | hidnplayr | 467 | |
2308 | hidnplayr | 468 | lea esi, [edx + sizeof.FRAGMENT_entry] ; Set esi to the correct begin of fragment |
469 | movzx ecx, [edx + sizeof.FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment |
||
470 | xchg cl, ch ; intel byte order |
||
1159 | hidnplayr | 471 | |
2308 | hidnplayr | 472 | cmp edi, eax ; Is this packet the first fragment ? |
473 | je .first_fragment |
||
474 | sub cx, bx ; If not, dont copy the header |
||
475 | add esi, ebx ; |
||
1473 | hidnplayr | 476 | .first_fragment: |
1159 | hidnplayr | 477 | |
2308 | hidnplayr | 478 | push cx ; First copy dword-wise, then byte-wise |
479 | shr cx, 2 ; |
||
480 | rep movsd ; |
||
481 | pop cx ; |
||
482 | and cx, 3 ; |
||
483 | rep movsb ; |
||
1159 | hidnplayr | 484 | |
2308 | hidnplayr | 485 | push eax |
486 | push edx ; Push pointer to fragment onto stack |
||
487 | mov ebx, [edx + FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet |
||
488 | mov edx, [edx + FRAGMENT_entry.NextPtr] ; Set edx to the next pointer |
||
489 | call kernel_free ; free the previous fragment buffer (this uses the value from stack) |
||
490 | pop eax |
||
491 | cmp edx, -1 ; Check if it is last fragment in chain |
||
492 | jne .rebuild_packet_loop |
||
1159 | hidnplayr | 493 | |
2308 | hidnplayr | 494 | pop ecx |
495 | xchg cl, ch |
||
496 | mov edx, eax |
||
497 | mov [edx + IPv4_header.TotalLength], cx |
||
498 | add esp, 8 |
||
2731 | hidnplayr | 499 | xchg cl, ch |
500 | push ecx |
||
1159 | hidnplayr | 501 | |
2731 | hidnplayr | 502 | push eax |
2308 | hidnplayr | 503 | jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr |
1249 | hidnplayr | 504 | |
1473 | hidnplayr | 505 | .destroy_slot_pop: |
2308 | hidnplayr | 506 | add esp, 4 |
1473 | hidnplayr | 507 | .destroy_slot: |
2891 | hidnplayr | 508 | DEBUGF 1,"IPv4_input: Destroy fragment slot!\n" |
2308 | hidnplayr | 509 | ; TODO! |
510 | jmp .dump |
||
1249 | hidnplayr | 511 | |
512 | |||
1159 | hidnplayr | 513 | |
514 | |||
515 | |||
516 | ;----------------------------------------------------------------- |
||
517 | ; |
||
518 | ; find fragment slot |
||
519 | ; |
||
1514 | hidnplayr | 520 | ; IN: pointer to fragmented packet in edx |
2731 | hidnplayr | 521 | ; OUT: pointer to slot in esi, -1 on error |
1159 | hidnplayr | 522 | ; |
523 | ;----------------------------------------------------------------- |
||
1473 | hidnplayr | 524 | align 4 |
525 | IPv4_find_fragment_slot: |
||
1159 | hidnplayr | 526 | |
1514 | hidnplayr | 527 | ;;; TODO: the RFC says we should check protocol number too |
528 | |||
2308 | hidnplayr | 529 | push eax ebx ecx edx |
530 | mov ax , [edx + IPv4_header.Identification] |
||
531 | mov ecx, MAX_FRAGMENTS |
||
532 | mov esi, FRAGMENT_LIST |
||
533 | mov ebx, [edx + IPv4_header.SourceAddress] |
||
534 | mov edx, [edx + IPv4_header.DestinationAddress] |
||
1159 | hidnplayr | 535 | .find_slot: |
2308 | hidnplayr | 536 | cmp [esi + FRAGMENT_slot.id], ax |
537 | jne .try_next |
||
538 | cmp [esi + FRAGMENT_slot.SrcIP], ebx |
||
539 | jne .try_next |
||
540 | cmp [esi + FRAGMENT_slot.DstIP], edx |
||
541 | je .found_slot |
||
1159 | hidnplayr | 542 | .try_next: |
2308 | hidnplayr | 543 | add esi, sizeof.FRAGMENT_slot |
544 | loop .find_slot |
||
1473 | hidnplayr | 545 | ; pop edx ebx |
2308 | hidnplayr | 546 | or esi, -1 |
1159 | hidnplayr | 547 | ; ret |
548 | |||
549 | .found_slot: |
||
2308 | hidnplayr | 550 | pop edx ecx ebx eax |
551 | ret |
||
1159 | hidnplayr | 552 | |
553 | |||
1514 | hidnplayr | 554 | ;------------------------------------------------------------------ |
1159 | hidnplayr | 555 | ; |
1529 | hidnplayr | 556 | ; IPv4_output |
1514 | hidnplayr | 557 | ; |
1159 | hidnplayr | 558 | ; IN: eax = dest ip |
2877 | hidnplayr | 559 | ; ebx = output device ptr/0 for automatic choice |
1159 | hidnplayr | 560 | ; ecx = data length |
2877 | hidnplayr | 561 | ; edx = source ip |
1529 | hidnplayr | 562 | ; di = TTL shl 8 + protocol |
1159 | hidnplayr | 563 | ; |
1249 | hidnplayr | 564 | ; OUT: eax = pointer to buffer start |
565 | ; ebx = pointer to device struct (needed for sending procedure) |
||
1159 | hidnplayr | 566 | ; ecx = unchanged (packet size of embedded data) |
1249 | hidnplayr | 567 | ; edx = size of complete buffer |
1514 | hidnplayr | 568 | ; edi = pointer to start of data (0 on error) |
1159 | hidnplayr | 569 | ; |
1514 | hidnplayr | 570 | ;------------------------------------------------------------------ |
1159 | hidnplayr | 571 | align 4 |
1529 | hidnplayr | 572 | IPv4_output: |
1159 | hidnplayr | 573 | |
2553 | hidnplayr | 574 | DEBUGF 1,"IPv4_output: size=%u\n", ecx |
1159 | hidnplayr | 575 | |
2308 | hidnplayr | 576 | cmp ecx, 65500 ; Max IPv4 packet size |
577 | ja .too_large |
||
1159 | hidnplayr | 578 | |
2877 | hidnplayr | 579 | push ecx eax edx di |
1206 | hidnplayr | 580 | |
2914 | hidnplayr | 581 | cmp eax, 1 shl 24 + 127 |
582 | je .loopback |
||
583 | |||
2877 | hidnplayr | 584 | call IPv4_dest_to_dev ; outputs device number in edi, dest ip in eax |
2308 | hidnplayr | 585 | call ARP_IP_to_MAC |
586 | test eax, 0xffff0000 ; error bits |
||
587 | jnz .arp_error |
||
2877 | hidnplayr | 588 | push ebx ; push the mac onto the stack |
2308 | hidnplayr | 589 | push ax |
1196 | hidnplayr | 590 | |
2877 | hidnplayr | 591 | inc [IP_PACKETS_TX + edi] ; update stats |
592 | |||
593 | mov ebx, [NET_DRV_LIST + edi] |
||
2308 | hidnplayr | 594 | lea eax, [ebx + ETH_DEVICE.mac] |
595 | mov edx, esp |
||
2877 | hidnplayr | 596 | mov ecx, [esp + 10 + 6] |
2308 | hidnplayr | 597 | add ecx, sizeof.IPv4_header |
2877 | hidnplayr | 598 | mov di, ETHER_IPv4 |
2308 | hidnplayr | 599 | call ETH_output |
2555 | hidnplayr | 600 | jz .eth_error |
2877 | hidnplayr | 601 | add esp, 6 ; pop the mac out of the stack |
1159 | hidnplayr | 602 | |
2914 | hidnplayr | 603 | .continue: |
2877 | hidnplayr | 604 | xchg cl, ch ; internet byte order |
2308 | hidnplayr | 605 | mov [edi + IPv4_header.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header) |
606 | mov [edi + IPv4_header.TypeOfService], 0 ; nothing special, just plain ip packet |
||
607 | mov [edi + IPv4_header.TotalLength], cx |
||
2877 | hidnplayr | 608 | mov [edi + IPv4_header.Identification], 0 ; fragment id: FIXME |
609 | mov [edi + IPv4_header.FlagsAndFragmentOffset], 0 |
||
2308 | hidnplayr | 610 | pop word [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
2305 | hidnplayr | 611 | ; [edi + IPv4_header.Protocol] |
2877 | hidnplayr | 612 | mov [edi + IPv4_header.HeaderChecksum], 0 |
2308 | hidnplayr | 613 | popd [edi + IPv4_header.SourceAddress] |
614 | popd [edi + IPv4_header.DestinationAddress] |
||
1529 | hidnplayr | 615 | |
2308 | hidnplayr | 616 | pop ecx |
1159 | hidnplayr | 617 | |
2308 | hidnplayr | 618 | IPv4_checksum edi |
619 | add edi, sizeof.IPv4_header |
||
2891 | hidnplayr | 620 | DEBUGF 1,"IPv4_output: success!\n" |
2308 | hidnplayr | 621 | ret |
1159 | hidnplayr | 622 | |
2555 | hidnplayr | 623 | .eth_error: |
624 | DEBUGF 1,"IPv4_output: ethernet error\n" |
||
2877 | hidnplayr | 625 | add esp, 3*4+2+6 |
626 | xor edi, edi |
||
2555 | hidnplayr | 627 | ret |
628 | |||
1529 | hidnplayr | 629 | .arp_error: |
2891 | hidnplayr | 630 | DEBUGF 1,"IPv4_output: ARP error=%x\n", eax |
2877 | hidnplayr | 631 | add esp, 3*4+2 |
632 | xor edi, edi |
||
2555 | hidnplayr | 633 | ret |
634 | |||
1529 | hidnplayr | 635 | .too_large: |
2891 | hidnplayr | 636 | DEBUGF 1,"IPv4_output: Packet too large!\n" |
2877 | hidnplayr | 637 | xor edi, edi |
2308 | hidnplayr | 638 | ret |
1159 | hidnplayr | 639 | |
2914 | hidnplayr | 640 | .loopback: |
641 | mov dword [esp + 2], eax |
||
642 | add ecx, sizeof.IPv4_header |
||
643 | mov di, ETHER_IPv4 |
||
644 | call LOOP_output |
||
645 | jmp .continue |
||
1159 | hidnplayr | 646 | |
1541 | hidnplayr | 647 | |
648 | |||
649 | |||
650 | ;------------------------------------------------------------------ |
||
651 | ; |
||
652 | ; IPv4_output_raw |
||
653 | ; |
||
654 | ; IN: eax = socket ptr |
||
655 | ; ecx = data length |
||
656 | ; esi = data ptr |
||
657 | ; |
||
658 | ; OUT: / |
||
659 | ; |
||
660 | ;------------------------------------------------------------------ |
||
661 | align 4 |
||
662 | IPv4_output_raw: |
||
663 | |||
2308 | hidnplayr | 664 | DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax |
1541 | hidnplayr | 665 | |
2308 | hidnplayr | 666 | cmp ecx, 1480 ;;;;; FIXME |
667 | ja .too_large |
||
1541 | hidnplayr | 668 | |
2308 | hidnplayr | 669 | sub esp, 8 |
670 | push esi eax |
||
1541 | hidnplayr | 671 | |
2877 | hidnplayr | 672 | call IPv4_dest_to_dev |
2308 | hidnplayr | 673 | call ARP_IP_to_MAC |
1541 | hidnplayr | 674 | |
2308 | hidnplayr | 675 | test eax, 0xffff0000 ; error bits |
676 | jnz .arp_error |
||
1541 | hidnplayr | 677 | |
2877 | hidnplayr | 678 | push ebx ; push the mac |
2308 | hidnplayr | 679 | push ax |
1541 | hidnplayr | 680 | |
2877 | hidnplayr | 681 | inc [IP_PACKETS_TX + edi] |
682 | mov ebx, [NET_DRV_LIST + edi] |
||
2308 | hidnplayr | 683 | lea eax, [ebx + ETH_DEVICE.mac] |
684 | mov edx, esp |
||
2877 | hidnplayr | 685 | mov ecx, [esp + 6 + 4] |
2308 | hidnplayr | 686 | add ecx, sizeof.IPv4_header |
687 | mov di, ETHER_IPv4 |
||
688 | call ETH_output |
||
689 | jz .error |
||
1541 | hidnplayr | 690 | |
2308 | hidnplayr | 691 | add esp, 6 ; pop the mac |
1541 | hidnplayr | 692 | |
2308 | hidnplayr | 693 | mov dword[esp+4+4], edx |
694 | mov dword[esp+4+4+4], eax |
||
1541 | hidnplayr | 695 | |
2308 | hidnplayr | 696 | pop eax esi |
1541 | hidnplayr | 697 | ;; todo: check socket options if we should add header, or just compute checksum |
698 | |||
2308 | hidnplayr | 699 | push edi ecx |
700 | rep movsb |
||
701 | pop ecx edi |
||
1541 | hidnplayr | 702 | |
2305 | hidnplayr | 703 | ; [edi + IPv4_header.VersionAndIHL] ; IPv4, normal length (no Optional header) |
704 | ; [edi + IPv4_header.TypeOfService] ; nothing special, just plain ip packet |
||
705 | ; [edi + IPv4_header.TotalLength] |
||
706 | ; [edi + IPv4_header.TotalLength] ; internet byte order |
||
707 | ; [edi + IPv4_header.FlagsAndFragmentOffset] |
||
1541 | hidnplayr | 708 | |
2308 | hidnplayr | 709 | mov [edi + IPv4_header.HeaderChecksum], 0 |
1541 | hidnplayr | 710 | |
2305 | hidnplayr | 711 | ; [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
712 | ; [edi + IPv4_header.Protocol] |
||
713 | ; [edi + IPv4_header.Identification] ; fragment id |
||
714 | ; [edi + IPv4_header.SourceAddress] |
||
715 | ; [edi + IPv4_header.DestinationAddress] |
||
1541 | hidnplayr | 716 | |
2308 | hidnplayr | 717 | IPv4_checksum edi ;;;; todo: checksum for IP packet with options! |
718 | add edi, sizeof.IPv4_header |
||
2891 | hidnplayr | 719 | DEBUGF 1,"IPv4_output_raw: device=%x\n", ebx |
2308 | hidnplayr | 720 | call [ebx + NET_DEVICE.transmit] |
721 | ret |
||
1541 | hidnplayr | 722 | |
723 | .error: |
||
2308 | hidnplayr | 724 | add esp, 6 |
1541 | hidnplayr | 725 | .arp_error: |
2308 | hidnplayr | 726 | add esp, 8+4+4 |
1541 | hidnplayr | 727 | .too_large: |
2308 | hidnplayr | 728 | DEBUGF 1,"IPv4_output_raw: Failed\n" |
729 | sub edi, edi |
||
730 | ret |
||
1541 | hidnplayr | 731 | |
732 | |||
1529 | hidnplayr | 733 | ;-------------------------------------------------------- |
734 | ; |
||
735 | ; |
||
736 | ; IN: dword [esp] = pointer to buffer containing ipv4 packet to be fragmented |
||
737 | ; dword [esp+4] = buffer size |
||
738 | ; esi = pointer to ip header in that buffer |
||
739 | ; ecx = max size of fragments |
||
740 | ; |
||
741 | ; OUT: / |
||
742 | ; |
||
743 | ;-------------------------------------------------------- |
||
1159 | hidnplayr | 744 | |
1482 | hidnplayr | 745 | align 4 |
1529 | hidnplayr | 746 | IPv4_fragment: |
1206 | hidnplayr | 747 | |
2308 | hidnplayr | 748 | DEBUGF 1,"IPv4_fragment\n" |
1482 | hidnplayr | 749 | |
2308 | hidnplayr | 750 | and ecx, not 111b ; align 4 |
1482 | hidnplayr | 751 | |
2308 | hidnplayr | 752 | cmp ecx, sizeof.IPv4_header + 8 ; must be able to put at least 8 bytes |
753 | jb .err2 |
||
1482 | hidnplayr | 754 | |
2308 | hidnplayr | 755 | push esi ecx |
756 | mov eax, [esi + IPv4_header.DestinationAddress] |
||
757 | call ARP_IP_to_MAC |
||
758 | pop ecx esi |
||
759 | cmp eax, -1 |
||
760 | jz .err2 |
||
1482 | hidnplayr | 761 | |
2308 | hidnplayr | 762 | push ebx |
763 | push ax |
||
1482 | hidnplayr | 764 | |
2308 | hidnplayr | 765 | mov ebx, [NET_DRV_LIST] |
766 | lea eax, [ebx + ETH_DEVICE.mac] |
||
767 | push eax |
||
1482 | hidnplayr | 768 | |
769 | |||
2308 | hidnplayr | 770 | push esi ; ptr to ip header |
771 | sub ecx, sizeof.IPv4_header ; substract header size |
||
772 | push ecx ; max data size |
||
773 | push dword 0 ; offset |
||
1482 | hidnplayr | 774 | |
1529 | hidnplayr | 775 | .new_fragment: |
2891 | hidnplayr | 776 | DEBUGF 1,"Ipv4_fragment: new fragment" |
1482 | hidnplayr | 777 | |
778 | |||
2308 | hidnplayr | 779 | mov eax, [esp + 3*4] |
780 | lea ebx, [esp + 4*4] |
||
781 | mov di , ETHER_IPv4 |
||
782 | call ETH_output |
||
1482 | hidnplayr | 783 | |
2308 | hidnplayr | 784 | cmp edi, -1 |
785 | jz .err |
||
1482 | hidnplayr | 786 | |
1529 | hidnplayr | 787 | ; copy header |
2308 | hidnplayr | 788 | mov esi, [esp + 2*4] |
789 | mov ecx, 5 ; 5 dwords: TODO: use IHL field of the header! |
||
790 | rep movsd |
||
1482 | hidnplayr | 791 | |
1529 | hidnplayr | 792 | ; copy data |
2308 | hidnplayr | 793 | mov esi, [esp + 2*4] |
794 | add esi, sizeof.IPv4_header |
||
795 | add esi, [esp] ; offset |
||
1482 | hidnplayr | 796 | |
2308 | hidnplayr | 797 | mov ecx, [esp + 1*4] |
2891 | hidnplayr | 798 | DEBUGF 1,"IPv4_fragment: copying %u bytes\n", ecx |
2308 | hidnplayr | 799 | rep movsb |
1482 | hidnplayr | 800 | |
1529 | hidnplayr | 801 | ; now, correct header |
2308 | hidnplayr | 802 | mov ecx, [esp + 1*4] |
803 | add ecx, sizeof.IPv4_header |
||
804 | xchg cl, ch |
||
805 | mov [edi + IPv4_header.TotalLength], cx |
||
1482 | hidnplayr | 806 | |
2308 | hidnplayr | 807 | mov ecx, [esp] ; offset |
808 | xchg cl, ch |
||
1482 | hidnplayr | 809 | |
1529 | hidnplayr | 810 | ; cmp dword[esp + 4*4], 0 ; last fragment?;<<<<<< |
811 | ; je .last_fragment |
||
2308 | hidnplayr | 812 | or cx, 1 shl 2 ; more fragments |
1529 | hidnplayr | 813 | ; .last_fragment: |
2308 | hidnplayr | 814 | mov [edi + IPv4_header.FlagsAndFragmentOffset], cx |
1482 | hidnplayr | 815 | |
2308 | hidnplayr | 816 | mov [edi + IPv4_header.HeaderChecksum], 0 |
1482 | hidnplayr | 817 | |
2308 | hidnplayr | 818 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< send the packet |
819 | mov ecx, [esp + 1*4] |
||
1482 | hidnplayr | 820 | |
2308 | hidnplayr | 821 | push edx eax |
822 | IPv4_checksum edi |
||
1529 | hidnplayr | 823 | |
2308 | hidnplayr | 824 | call [ebx + NET_DEVICE.transmit] |
825 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
||
1529 | hidnplayr | 826 | |
2308 | hidnplayr | 827 | mov ecx, [esp+4] |
828 | add [esp], ecx |
||
1529 | hidnplayr | 829 | |
2308 | hidnplayr | 830 | mov ecx, [esp+3*4+6+4] ; ptr to begin of buff |
831 | add ecx, [esp+3*4+6+4+4] ; buff size |
||
832 | sub ecx, [esp+2*4] ; ptr to ip header |
||
833 | add ecx, [esp] ; offset |
||
1529 | hidnplayr | 834 | |
2891 | hidnplayr | 835 | DEBUGF 1,"Ipv4_fragment: %u bytes remaining\n", ecx |
1529 | hidnplayr | 836 | |
2308 | hidnplayr | 837 | cmp ecx, [esp+1*4] |
838 | jae .new_fragment |
||
1529 | hidnplayr | 839 | |
2308 | hidnplayr | 840 | mov [esp+4], ecx ; set fragment size to remaining packet size |
841 | jmp .new_fragment |
||
1529 | hidnplayr | 842 | |
843 | .err: |
||
2891 | hidnplayr | 844 | DEBUGF 1,"Ipv4_fragment: failed\n" |
1529 | hidnplayr | 845 | .done: |
2308 | hidnplayr | 846 | add esp, 12 + 4 + 6 |
1529 | hidnplayr | 847 | .err2: |
2891 | hidnplayr | 848 | DEBUGF 1,"Ipv4_fragment: dumping\n" |
2308 | hidnplayr | 849 | call kernel_free |
850 | add esp, 4 |
||
1529 | hidnplayr | 851 | |
2308 | hidnplayr | 852 | ret |
1529 | hidnplayr | 853 | |
854 | |||
855 | |||
1159 | hidnplayr | 856 | ;--------------------------------------------------------------------------- |
857 | ; |
||
858 | ; IPv4_dest_to_dev |
||
859 | ; |
||
2877 | hidnplayr | 860 | ; IN: eax = Destination IP |
861 | ; OUT: edi = device id * 4 |
||
862 | ; eax = ip of gateway if nescessary, unchanged otherwise |
||
1159 | hidnplayr | 863 | ; |
864 | ;--------------------------------------------------------------------------- |
||
865 | align 4 |
||
866 | IPv4_dest_to_dev: |
||
867 | |||
2308 | hidnplayr | 868 | cmp eax, 0xffffffff |
2877 | hidnplayr | 869 | je .broadcast |
1159 | hidnplayr | 870 | |
2308 | hidnplayr | 871 | xor edi, edi |
872 | mov ecx, MAX_IP |
||
1159 | hidnplayr | 873 | .loop: |
2308 | hidnplayr | 874 | mov ebx, [IP_LIST+edi] |
875 | and ebx, [SUBNET_LIST+edi] |
||
876 | jz .next |
||
877 | mov edx, eax |
||
878 | and edx, [SUBNET_LIST+edi] |
||
1159 | hidnplayr | 879 | |
2308 | hidnplayr | 880 | cmp ebx, edx |
881 | je .found_it |
||
1529 | hidnplayr | 882 | .next: |
2308 | hidnplayr | 883 | add edi, 4 |
2731 | hidnplayr | 884 | dec ecx |
885 | jnz .loop |
||
1159 | hidnplayr | 886 | |
1529 | hidnplayr | 887 | .invalid: |
2877 | hidnplayr | 888 | xor edi, edi ; if none found, use device 0 as default |
889 | mov eax, [GATEWAY_LIST] |
||
1159 | hidnplayr | 890 | |
891 | .found_it: |
||
2308 | hidnplayr | 892 | DEBUGF 1,"IPv4_dest_to_dev: %u\n", edi |
2877 | hidnplayr | 893 | ret |
1159 | hidnplayr | 894 | |
2877 | hidnplayr | 895 | .broadcast: |
896 | xor edi, edi |
||
2308 | hidnplayr | 897 | ret |
1159 | hidnplayr | 898 | |
899 | |||
900 | |||
901 | ;--------------------------------------------------------------------------- |
||
902 | ; |
||
903 | ; IPv4_get_frgmnt_num |
||
904 | ; |
||
905 | ; IN: / |
||
906 | ; OUT: fragment number in ax |
||
907 | ; |
||
908 | ;--------------------------------------------------------------------------- |
||
909 | align 4 |
||
910 | IPv4_get_frgmnt_num: |
||
2308 | hidnplayr | 911 | xor ax, ax ;;; TODO: replace this with real code |
1159 | hidnplayr | 912 | |
2308 | hidnplayr | 913 | ret |
1159 | hidnplayr | 914 | |
915 | |||
916 | ;--------------------------------------------------------------------------- |
||
917 | ; |
||
918 | ; IPv4_API |
||
919 | ; |
||
920 | ; This function is called by system function 75 |
||
921 | ; |
||
922 | ; IN: subfunction number in bl |
||
923 | ; device number in bh |
||
924 | ; ecx, edx, .. depends on subfunction |
||
925 | ; |
||
926 | ; OUT: |
||
927 | ; |
||
928 | ;--------------------------------------------------------------------------- |
||
929 | align 4 |
||
2614 | hidnplayr | 930 | IPv4_api: |
1159 | hidnplayr | 931 | |
2308 | hidnplayr | 932 | movzx eax, bh |
933 | shl eax, 2 |
||
1159 | hidnplayr | 934 | |
2621 | hidnplayr | 935 | and ebx, 0x000000ff |
2614 | hidnplayr | 936 | cmp ebx, .number |
937 | ja .error |
||
938 | jmp dword [.table + 4*ebx] |
||
1159 | hidnplayr | 939 | |
2614 | hidnplayr | 940 | .table: |
941 | dd .packets_tx ; 0 |
||
942 | dd .packets_rx ; 1 |
||
2621 | hidnplayr | 943 | dd .read_ip ; 2 |
2614 | hidnplayr | 944 | dd .write_ip ; 3 |
945 | dd .read_dns ; 4 |
||
946 | dd .write_dns ; 5 |
||
947 | dd .read_subnet ; 6 |
||
948 | dd .write_subnet ; 7 |
||
949 | dd .read_gateway ; 8 |
||
950 | dd .write_gateway ; 9 |
||
951 | .number = ($ - .table) / 4 - 1 |
||
952 | |||
1473 | hidnplayr | 953 | .error: |
2308 | hidnplayr | 954 | mov eax, -1 |
955 | ret |
||
1159 | hidnplayr | 956 | |
1473 | hidnplayr | 957 | .packets_tx: |
2614 | hidnplayr | 958 | mov eax, [IP_PACKETS_TX + eax] |
2308 | hidnplayr | 959 | ret |
1159 | hidnplayr | 960 | |
1473 | hidnplayr | 961 | .packets_rx: |
2614 | hidnplayr | 962 | mov eax, [IP_PACKETS_RX + eax] |
2308 | hidnplayr | 963 | ret |
1159 | hidnplayr | 964 | |
1473 | hidnplayr | 965 | .read_ip: |
2614 | hidnplayr | 966 | mov eax, [IP_LIST + eax] |
2308 | hidnplayr | 967 | ret |
1159 | hidnplayr | 968 | |
1473 | hidnplayr | 969 | .write_ip: |
2614 | hidnplayr | 970 | mov [IP_LIST + eax], ecx |
2731 | hidnplayr | 971 | |
972 | ; pre-calculate the local broadcast address |
||
973 | mov ebx, [SUBNET_LIST + eax] |
||
974 | not ebx |
||
975 | or ecx, ebx |
||
976 | mov [BROADCAST_LIST + eax], ecx |
||
977 | |||
2308 | hidnplayr | 978 | xor eax, eax |
979 | ret |
||
1159 | hidnplayr | 980 | |
1473 | hidnplayr | 981 | .read_dns: |
2614 | hidnplayr | 982 | mov eax, [DNS_LIST + eax] |
2308 | hidnplayr | 983 | ret |
1159 | hidnplayr | 984 | |
1473 | hidnplayr | 985 | .write_dns: |
2614 | hidnplayr | 986 | mov [DNS_LIST + eax], ecx |
2308 | hidnplayr | 987 | xor eax, eax |
988 | ret |
||
1159 | hidnplayr | 989 | |
1473 | hidnplayr | 990 | .read_subnet: |
2614 | hidnplayr | 991 | mov eax, [SUBNET_LIST + eax] |
2308 | hidnplayr | 992 | ret |
1159 | hidnplayr | 993 | |
1473 | hidnplayr | 994 | .write_subnet: |
2614 | hidnplayr | 995 | mov [SUBNET_LIST + eax], ecx |
2731 | hidnplayr | 996 | |
997 | ; pre-calculate the local broadcast address |
||
998 | mov ebx, [IP_LIST + eax] |
||
999 | not ecx |
||
1000 | or ecx, ebx |
||
1001 | mov [BROADCAST_LIST + eax], ecx |
||
1002 | |||
2308 | hidnplayr | 1003 | xor eax, eax |
1004 | ret |
||
1159 | hidnplayr | 1005 | |
1473 | hidnplayr | 1006 | .read_gateway: |
2614 | hidnplayr | 1007 | mov eax, [GATEWAY_LIST + eax] |
2308 | hidnplayr | 1008 | ret |
1159 | hidnplayr | 1009 | |
1473 | hidnplayr | 1010 | .write_gateway: |
2614 | hidnplayr | 1011 | mov [GATEWAY_LIST + eax], ecx |
2308 | hidnplayr | 1012 | xor eax, eax |
1013 | ret |