Rev 2607 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
1159 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
||
2305 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;; |
1159 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
||
1249 | hidnplayr | 6 | ;; IPv4.INC ;; |
1159 | hidnplayr | 7 | ;; ;; |
8 | ;; Part of the tcp/ip network stack for KolibriOS ;; |
||
9 | ;; ;; |
||
10 | ;; Based on the work of [Johnny_B] and [smb] ;; |
||
11 | ;; ;; |
||
12 | ;; Written by hidnplayr@kolibrios.org ;; |
||
13 | ;; ;; |
||
14 | ;; GNU GENERAL PUBLIC LICENSE ;; |
||
15 | ;; Version 2, June 1991 ;; |
||
16 | ;; ;; |
||
17 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
||
18 | |||
1206 | hidnplayr | 19 | $Revision: 2614 $ |
1159 | hidnplayr | 20 | |
2614 | hidnplayr | 21 | MAX_FRAGMENTS = 64 |
22 | MAX_IP = MAX_NET_DEVICES |
||
23 | IP_MAX_INTERFACES = MAX_IP |
||
1159 | hidnplayr | 24 | |
2308 | hidnplayr | 25 | struct IPv4_header |
2305 | hidnplayr | 26 | |
2308 | 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] |
||
29 | TotalLength dw ? |
||
30 | Identification dw ? |
||
31 | FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15] |
||
32 | TimeToLive db ? ; |
||
33 | Protocol db ? |
||
34 | HeaderChecksum dw ? |
||
35 | SourceAddress dd ? |
||
36 | DestinationAddress dd ? |
||
2305 | hidnplayr | 37 | |
1159 | hidnplayr | 38 | ends |
39 | |||
2308 | hidnplayr | 40 | struct FRAGMENT_slot |
2305 | hidnplayr | 41 | |
2308 | hidnplayr | 42 | ttl dw ? ; Time to live for this entry, 0 for empty slot's |
43 | id dw ? ; Identification field from IP header |
||
44 | SrcIP dd ? ; .. from IP header |
||
45 | DstIP dd ? ; .. from IP header |
||
46 | ptr dd ? ; Pointer to first packet |
||
2305 | hidnplayr | 47 | |
1159 | hidnplayr | 48 | ends |
49 | |||
2308 | hidnplayr | 50 | struct FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets |
2305 | hidnplayr | 51 | |
2308 | 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) |
||
54 | Owner dd ? ; Pointer to structure of driver |
||
55 | rb 2 ; to match ethernet header size ; TODO: fix this hack |
||
56 | ; Ip header begins here (we will need the IP header to re-construct the complete packet) |
||
1159 | hidnplayr | 57 | ends |
58 | |||
1529 | hidnplayr | 59 | |
1530 | hidnplayr | 60 | align 4 |
61 | uglobal |
||
1529 | hidnplayr | 62 | |
2308 | hidnplayr | 63 | IP_LIST rd MAX_IP |
64 | SUBNET_LIST rd MAX_IP |
||
65 | DNS_LIST rd MAX_IP |
||
66 | GATEWAY_LIST rd MAX_IP |
||
1529 | hidnplayr | 67 | |
2308 | hidnplayr | 68 | IP_PACKETS_TX rd MAX_IP |
69 | IP_PACKETS_RX rd MAX_IP |
||
1530 | hidnplayr | 70 | |
2308 | hidnplayr | 71 | FRAGMENT_LIST rb MAX_FRAGMENTS * sizeof.FRAGMENT_slot |
1530 | hidnplayr | 72 | endg |
73 | |||
74 | |||
75 | ;----------------------------------------------------------------- |
||
76 | ; |
||
77 | ; IPv4_init |
||
78 | ; |
||
79 | ; This function resets all IP variables |
||
80 | ; |
||
81 | ;----------------------------------------------------------------- |
||
2308 | hidnplayr | 82 | macro IPv4_init { |
1530 | hidnplayr | 83 | |
2308 | hidnplayr | 84 | xor eax, eax |
85 | mov edi, IP_LIST |
||
86 | mov ecx, 4*MAX_IP |
||
87 | rep stosd |
||
1530 | hidnplayr | 88 | |
2308 | hidnplayr | 89 | mov edi, FRAGMENT_LIST |
90 | mov ecx, sizeof.FRAGMENT_slot*MAX_FRAGMENTS/4 + 2*MAX_IP |
||
91 | rep stosd |
||
1530 | hidnplayr | 92 | |
93 | } |
||
94 | |||
95 | |||
96 | ;----------------------------------------------------------------- |
||
97 | ; |
||
98 | ; Decrease TimeToLive of all fragment slots |
||
99 | ; |
||
100 | ;----------------------------------------------------------------- |
||
101 | macro IPv4_decrease_fragment_ttls { |
||
102 | |||
2308 | hidnplayr | 103 | local .loop |
1530 | hidnplayr | 104 | |
2308 | hidnplayr | 105 | mov esi, FRAGMENT_LIST |
106 | mov ecx, MAX_FRAGMENTS |
||
1530 | hidnplayr | 107 | .loop: |
2308 | hidnplayr | 108 | cmp [esi + FRAGMENT_slot.ttl], 0 |
109 | je .try_next |
||
110 | dec [esi + FRAGMENT_slot.ttl] |
||
111 | jnz .try_next |
||
112 | DEBUGF 1,"Fragment slot timed-out!\n" |
||
1530 | hidnplayr | 113 | ;;; TODO: clear all entry's of timed-out slot |
114 | .try_next: |
||
2308 | hidnplayr | 115 | add esi, 4 |
116 | loop .loop |
||
1530 | hidnplayr | 117 | } |
118 | |||
119 | |||
120 | |||
1529 | hidnplayr | 121 | macro IPv4_checksum ptr { |
122 | |||
2309 | hidnplayr | 123 | ; This is the fast procedure to create or check an IP header without options |
1529 | hidnplayr | 124 | ; To create a new checksum, the checksum field must be set to 0 before computation |
125 | ; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct |
||
126 | |||
2308 | hidnplayr | 127 | push ebx |
128 | xor ebx, ebx |
||
129 | add bl, [ptr+1] |
||
130 | adc bh, [ptr+0] |
||
1529 | hidnplayr | 131 | |
2308 | hidnplayr | 132 | adc bl, [ptr+3] |
133 | adc bh, [ptr+2] |
||
1529 | hidnplayr | 134 | |
2308 | hidnplayr | 135 | adc bl, [ptr+5] |
136 | adc bh, [ptr+4] |
||
1529 | hidnplayr | 137 | |
2308 | hidnplayr | 138 | adc bl, [ptr+7] |
139 | adc bh, [ptr+6] |
||
1529 | hidnplayr | 140 | |
2308 | hidnplayr | 141 | adc bl, [ptr+9] |
142 | adc bh, [ptr+8] |
||
1529 | hidnplayr | 143 | |
144 | ; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation |
||
145 | |||
2308 | hidnplayr | 146 | adc bl, [ptr+13] |
147 | adc bh, [ptr+12] |
||
1529 | hidnplayr | 148 | |
2308 | hidnplayr | 149 | adc bl, [ptr+15] |
150 | adc bh, [ptr+14] |
||
1529 | hidnplayr | 151 | |
2308 | hidnplayr | 152 | adc bl, [ptr+17] |
153 | adc bh, [ptr+16] |
||
1529 | hidnplayr | 154 | |
2308 | hidnplayr | 155 | adc bl, [ptr+19] |
156 | adc bh, [ptr+18] |
||
1529 | hidnplayr | 157 | |
2308 | hidnplayr | 158 | adc ebx, 0 |
1529 | hidnplayr | 159 | |
2308 | hidnplayr | 160 | push ecx |
161 | mov ecx, ebx |
||
162 | shr ecx, 16 |
||
163 | and ebx, 0xffff |
||
164 | add ebx, ecx |
||
1529 | hidnplayr | 165 | |
2308 | hidnplayr | 166 | mov ecx, ebx |
167 | shr ecx, 16 |
||
168 | add ebx, ecx |
||
1529 | hidnplayr | 169 | |
2308 | hidnplayr | 170 | not bx |
171 | jnz .not_zero |
||
172 | dec bx |
||
1529 | hidnplayr | 173 | .not_zero: |
2308 | hidnplayr | 174 | xchg bl, bh |
175 | pop ecx |
||
1529 | hidnplayr | 176 | |
2308 | hidnplayr | 177 | neg word [ptr+10] ; zero will stay zero so we just get the checksum |
178 | add word [ptr+10], bx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :) |
||
179 | pop ebx |
||
1529 | hidnplayr | 180 | |
181 | } |
||
182 | |||
183 | |||
184 | |||
1159 | hidnplayr | 185 | ;----------------------------------------------------------------- |
186 | ; |
||
1529 | hidnplayr | 187 | ; IPv4_input: |
1159 | hidnplayr | 188 | ; |
1249 | hidnplayr | 189 | ; Will check if IP Packet isnt damaged |
1159 | hidnplayr | 190 | ; and call appropriate handler. (TCP/UDP/ICMP/..) |
191 | ; |
||
192 | ; It will also re-construct fragmented packets |
||
193 | ; |
||
194 | ; IN: Pointer to buffer in [esp] |
||
195 | ; size of buffer in [esp+4] |
||
196 | ; pointer to device struct in ebx |
||
2614 | hidnplayr | 197 | ; pointer to IP header in edx |
198 | ; size of IP packet in ecx |
||
1159 | hidnplayr | 199 | ; OUT: / |
200 | ; |
||
201 | ;----------------------------------------------------------------- |
||
202 | align 4 |
||
2308 | hidnplayr | 203 | IPv4_input: ; TODO: implement handler for IP options |
204 | ; TODO2: add code for raw sockets |
||
1159 | hidnplayr | 205 | |
2553 | hidnplayr | 206 | DEBUGF 1,"IPv4_input, packet from: %u.%u.%u.%u ",\ |
2308 | hidnplayr | 207 | [edx + IPv4_header.SourceAddress]:1,[edx + IPv4_header.SourceAddress + 1]:1,[edx + IPv4_header.SourceAddress + 2]:1,[edx + IPv4_header.SourceAddress + 3]:1 |
208 | DEBUGF 1,"to: %u.%u.%u.%u\n",\ |
||
209 | [edx + IPv4_header.DestinationAddress]:1,[edx + IPv4_header.DestinationAddress + 1]:1,[edx + IPv4_header.DestinationAddress + 2]:1,[edx + IPv4_header.DestinationAddress + 3]:1 |
||
1159 | hidnplayr | 210 | |
1473 | hidnplayr | 211 | ;------------------------------------------- |
212 | ; Check if the packet still has time to live |
||
1159 | hidnplayr | 213 | |
2308 | hidnplayr | 214 | cmp byte [edx + IPv4_header.TimeToLive], 0 |
215 | je .dump |
||
1473 | hidnplayr | 216 | |
217 | ;-------------------------------------- |
||
218 | ; First, check if IP packet has options |
||
219 | |||
2308 | hidnplayr | 220 | movzx eax, [edx + IPv4_header.VersionAndIHL] |
221 | and al , 0x0f ; get IHL(header length) |
||
222 | cmp al , 0x05 ; IHL!= 5*4(20 bytes) |
||
223 | jnz .has_options |
||
1473 | hidnplayr | 224 | |
225 | ;------------------------------- |
||
1514 | hidnplayr | 226 | ; Now, re-calculate the checksum |
1473 | hidnplayr | 227 | |
2308 | hidnplayr | 228 | IPv4_checksum edx |
229 | jnz .dump ; if checksum isn't valid then dump packet |
||
1249 | hidnplayr | 230 | |
2308 | hidnplayr | 231 | DEBUGF 1,"IPv4 Checksum is correct\n" |
1254 | hidnplayr | 232 | |
1514 | hidnplayr | 233 | ;----------------------------------- |
234 | ; Check if destination IP is correct |
||
1473 | hidnplayr | 235 | |
2308 | hidnplayr | 236 | call NET_ptr_to_num |
237 | shl edi, 2 |
||
1473 | hidnplayr | 238 | |
2308 | hidnplayr | 239 | ; check if it matches local ip |
1473 | hidnplayr | 240 | |
2308 | hidnplayr | 241 | mov eax, [IP_LIST+edi] |
242 | cmp [edx + IPv4_header.DestinationAddress], eax |
||
243 | je .ip_ok |
||
1159 | hidnplayr | 244 | |
2308 | hidnplayr | 245 | ; check for broadcast |
1514 | hidnplayr | 246 | |
2308 | hidnplayr | 247 | mov eax, [SUBNET_LIST+edi] |
248 | not eax |
||
249 | or eax, [IP_LIST+edi] |
||
250 | cmp [edx + IPv4_header.DestinationAddress], eax |
||
251 | je .ip_ok |
||
1159 | hidnplayr | 252 | |
2308 | hidnplayr | 253 | ; or a special broadcast |
1159 | hidnplayr | 254 | |
2308 | hidnplayr | 255 | cmp [edx + IPv4_header.DestinationAddress], -1 |
256 | je .ip_ok |
||
1473 | hidnplayr | 257 | |
2308 | hidnplayr | 258 | ; maybe it's a multicast then |
1519 | hidnplayr | 259 | |
2308 | hidnplayr | 260 | mov eax, [edx + IPv4_header.DestinationAddress] |
261 | and eax, 0xff000000 |
||
1514 | hidnplayr | 262 | ; cmp eax, 224 shl 24 |
263 | ; je .ip_ok |
||
1159 | hidnplayr | 264 | |
2308 | hidnplayr | 265 | ; or a loopback address |
1473 | hidnplayr | 266 | |
2308 | hidnplayr | 267 | cmp eax, 127 shl 24 |
268 | je .ip_ok |
||
1473 | hidnplayr | 269 | |
2308 | hidnplayr | 270 | ; or it's not meant for us.. |
1159 | hidnplayr | 271 | |
2308 | hidnplayr | 272 | DEBUGF 2,"Destination address does not match!\n" |
273 | jmp .dump |
||
1159 | hidnplayr | 274 | |
1514 | hidnplayr | 275 | ;------------------------ |
276 | ; Now we can update stats |
||
1159 | hidnplayr | 277 | |
1514 | hidnplayr | 278 | .ip_ok: |
2308 | hidnplayr | 279 | inc [IP_PACKETS_RX+edi] |
1159 | hidnplayr | 280 | |
1473 | hidnplayr | 281 | ;---------------------------------- |
282 | ; Check if the packet is fragmented |
||
1159 | hidnplayr | 283 | |
2308 | hidnplayr | 284 | test [edx + IPv4_header.FlagsAndFragmentOffset], 1 shl 5 ; Is 'more fragments' flag set ? |
285 | jnz .has_fragments ; If so, we definately have a fragmented packet |
||
1159 | hidnplayr | 286 | |
2308 | hidnplayr | 287 | 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 |
288 | jnz .is_last_fragment |
||
1473 | hidnplayr | 289 | |
290 | ;------------------------------------------------------------------- |
||
291 | ; No, it's just a regular IP packet, pass it to the higher protocols |
||
292 | |||
2308 | hidnplayr | 293 | .handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed |
1159 | hidnplayr | 294 | |
2308 | hidnplayr | 295 | movzx esi, [edx + IPv4_header.VersionAndIHL] ; Calculate Header length by using IHL field |
296 | and esi, 0x0000000f ; |
||
297 | shl esi, 2 ; |
||
1473 | hidnplayr | 298 | |
2308 | hidnplayr | 299 | movzx ecx, [edx + IPv4_header.TotalLength] ; Calculate length of encapsulated Packet |
300 | xchg cl , ch ; |
||
301 | sub ecx, esi ; |
||
1159 | hidnplayr | 302 | |
2308 | hidnplayr | 303 | lea edi, [edx + IPv4_header.SourceAddress] ; make edi ptr to source and dest IPv4 address |
304 | mov al , [edx + IPv4_header.Protocol] |
||
2310 | hidnplayr | 305 | add esi, edx ; make esi ptr to data |
1159 | hidnplayr | 306 | |
2308 | hidnplayr | 307 | cmp al , IP_PROTO_TCP |
308 | je TCP_input |
||
1159 | hidnplayr | 309 | |
2308 | hidnplayr | 310 | cmp al , IP_PROTO_UDP |
311 | je UDP_input |
||
1159 | hidnplayr | 312 | |
2308 | hidnplayr | 313 | cmp al , IP_PROTO_ICMP |
314 | je ICMP_input |
||
1159 | hidnplayr | 315 | |
2308 | hidnplayr | 316 | DEBUGF 2,"unknown Internet protocol: %u\n", al |
317 | |||
1159 | hidnplayr | 318 | .dump: |
2308 | hidnplayr | 319 | DEBUGF 2,"IP_Handler - dumping\n" |
1159 | hidnplayr | 320 | ; inc [dumped_rx_count] |
2308 | hidnplayr | 321 | call kernel_free |
322 | add esp, 4 ; pop (balance stack) |
||
323 | ret |
||
1159 | hidnplayr | 324 | |
325 | |||
1473 | hidnplayr | 326 | ;--------------------------- |
327 | ; Fragmented packet handler |
||
328 | |||
329 | |||
330 | .has_fragments: |
||
2308 | hidnplayr | 331 | movzx eax, [edx + IPv4_header.FlagsAndFragmentOffset] |
332 | xchg al , ah |
||
333 | shl ax , 3 |
||
1473 | hidnplayr | 334 | |
2308 | hidnplayr | 335 | DEBUGF 1,"Fragmented packet, offset:%u, id:%x\n", ax, [edx + IPv4_header.Identification]:4 |
1159 | hidnplayr | 336 | |
2308 | hidnplayr | 337 | test ax , ax ; Is this the first packet of the fragment? |
338 | jz .is_first_fragment |
||
1159 | hidnplayr | 339 | |
1473 | hidnplayr | 340 | |
341 | ;------------------------------------------------------- |
||
342 | ; We have a fragmented IP packet, but it's not the first |
||
343 | |||
2308 | hidnplayr | 344 | DEBUGF 1,"Middle fragmented packet received!\n" |
1473 | hidnplayr | 345 | |
2308 | hidnplayr | 346 | call IPv4_find_fragment_slot |
347 | cmp esi, -1 |
||
348 | je .dump |
||
1473 | hidnplayr | 349 | |
2308 | hidnplayr | 350 | mov [esi + FRAGMENT_slot.ttl], 15 ; Reset the ttl |
351 | mov esi, [esi + FRAGMENT_slot.ptr] |
||
352 | or edi, -1 |
||
353 | .find_last_entry: ; The following routine will try to find the last entry |
||
354 | cmp edi, [esi + FRAGMENT_entry.PrevPtr] |
||
355 | jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
||
356 | mov edi, esi |
||
357 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
||
358 | cmp esi, -1 |
||
359 | jne .find_last_entry |
||
360 | ; We found the last entry (pointer is now in edi) |
||
361 | ; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure |
||
1473 | hidnplayr | 362 | |
2308 | hidnplayr | 363 | pop eax ; pointer to packet |
364 | mov [edi + FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry |
||
365 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
||
366 | mov [eax + FRAGMENT_entry.PrevPtr], edi |
||
367 | mov [eax + FRAGMENT_entry.Owner], ebx |
||
1473 | hidnplayr | 368 | |
2308 | hidnplayr | 369 | add esp, 4 |
370 | ret |
||
1473 | hidnplayr | 371 | |
372 | |||
373 | ;------------------------------------ |
||
374 | ; We have received the first fragment |
||
375 | |||
376 | .is_first_fragment: |
||
2308 | hidnplayr | 377 | DEBUGF 1,"First fragmented packet received!\n" |
378 | ; try to locate a free slot.. |
||
379 | mov ecx, MAX_FRAGMENTS |
||
380 | mov esi, FRAGMENT_LIST |
||
1473 | hidnplayr | 381 | .find_free_slot: |
2308 | hidnplayr | 382 | cmp word [esi + FRAGMENT_slot.ttl], 0 |
383 | je .found_free_slot |
||
384 | add esi, sizeof.FRAGMENT_slot |
||
385 | loop .find_free_slot |
||
386 | jmp .dump ; If no free slot was found, dump the packet |
||
1159 | hidnplayr | 387 | |
2308 | hidnplayr | 388 | .found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure |
389 | mov [esi + FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl |
||
390 | mov ax , [edx + IPv4_header.Identification] |
||
391 | mov [esi + FRAGMENT_slot.id], ax |
||
392 | mov eax,[edx + IPv4_header.SourceAddress] |
||
393 | mov [esi + FRAGMENT_slot.SrcIP], eax |
||
394 | mov eax, [edx + IPv4_header.DestinationAddress] |
||
395 | mov [esi + FRAGMENT_slot.DstIP], eax |
||
396 | pop eax |
||
397 | mov [esi + FRAGMENT_slot.ptr], eax |
||
398 | ; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure |
||
399 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
||
400 | mov [eax + FRAGMENT_entry.PrevPtr], -1 |
||
401 | mov [eax + FRAGMENT_entry.Owner], ebx |
||
1159 | hidnplayr | 402 | |
2308 | hidnplayr | 403 | add esp, 4 ; balance stack and exit |
404 | ret |
||
1159 | hidnplayr | 405 | |
406 | |||
1473 | hidnplayr | 407 | ;----------------------------------- |
408 | ; We have received the last fragment |
||
1159 | hidnplayr | 409 | |
1473 | hidnplayr | 410 | .is_last_fragment: |
2308 | hidnplayr | 411 | DEBUGF 1,"Last fragmented packet received!\n" |
1159 | hidnplayr | 412 | |
2308 | hidnplayr | 413 | call IPv4_find_fragment_slot |
414 | cmp esi, -1 |
||
415 | je .dump |
||
1159 | hidnplayr | 416 | |
2308 | hidnplayr | 417 | 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 |
418 | push esi |
||
419 | xor eax, eax |
||
420 | or edi, -1 |
||
1473 | hidnplayr | 421 | |
422 | .count_bytes: |
||
2308 | hidnplayr | 423 | cmp [esi + FRAGMENT_entry.PrevPtr], edi |
424 | jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
||
425 | mov cx, [esi + sizeof.FRAGMENT_entry + IPv4_header.TotalLength] ; Add total length |
||
426 | xchg cl, ch |
||
427 | DEBUGF 1,"Packet size: %u\n", cx |
||
428 | add ax, cx |
||
429 | movzx cx, [esi + sizeof.FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Sub Header length |
||
430 | and cx, 0x000F |
||
431 | shl cx, 2 |
||
432 | DEBUGF 1,"Header size: %u\n", cx |
||
433 | sub ax, cx |
||
434 | mov edi, esi |
||
435 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
||
436 | cmp esi, -1 |
||
437 | jne .count_bytes |
||
1159 | hidnplayr | 438 | |
2308 | hidnplayr | 439 | mov esi, [esp+4] |
440 | mov [edi + FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code |
||
441 | mov [esi + FRAGMENT_entry.NextPtr], -1 |
||
442 | mov [esi + FRAGMENT_entry.PrevPtr], edi |
||
443 | mov [esi + FRAGMENT_entry.Owner], ebx |
||
1159 | hidnplayr | 444 | |
2308 | hidnplayr | 445 | mov cx, [edx + IPv4_header.TotalLength] ; Note: This time we dont substract Header length |
446 | xchg cl , ch |
||
447 | DEBUGF 1,"Packet size: %u\n", cx |
||
448 | add ax , cx |
||
449 | DEBUGF 1,"Total Received data size: %u\n", eax |
||
1159 | hidnplayr | 450 | |
2308 | hidnplayr | 451 | push eax |
452 | mov ax , [edx + IPv4_header.FlagsAndFragmentOffset] |
||
453 | xchg al , ah |
||
454 | shl ax , 3 |
||
455 | add cx , ax |
||
456 | pop eax |
||
457 | DEBUGF 1,"Total Fragment size: %u\n", ecx |
||
1159 | hidnplayr | 458 | |
2308 | hidnplayr | 459 | cmp ax, cx |
460 | jne .destroy_slot_pop |
||
1159 | hidnplayr | 461 | |
2308 | hidnplayr | 462 | push eax |
463 | push eax |
||
464 | call kernel_alloc |
||
465 | test eax, eax |
||
466 | je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot |
||
467 | mov edx, [esp+4] ; Get pointer to first fragment entry back in edx |
||
1159 | hidnplayr | 468 | |
1473 | hidnplayr | 469 | .rebuild_packet_loop: |
2308 | hidnplayr | 470 | movzx ecx, [edx + sizeof.FRAGMENT_entry + IPv4_header.FlagsAndFragmentOffset] ; Calculate the fragment offset |
471 | xchg cl , ch ; intel byte order |
||
472 | shl cx , 3 ; multiply by 8 and clear first 3 bits |
||
473 | DEBUGF 1,"Fragment offset: %u\n", cx |
||
1159 | hidnplayr | 474 | |
2308 | hidnplayr | 475 | lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment |
476 | movzx ebx, [edx + sizeof.FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment |
||
477 | and bx , 0x000F ; |
||
478 | shl bx , 2 ; |
||
1159 | hidnplayr | 479 | |
2308 | hidnplayr | 480 | lea esi, [edx + sizeof.FRAGMENT_entry] ; Set esi to the correct begin of fragment |
481 | movzx ecx, [edx + sizeof.FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment |
||
482 | xchg cl, ch ; intel byte order |
||
1159 | hidnplayr | 483 | |
2308 | hidnplayr | 484 | cmp edi, eax ; Is this packet the first fragment ? |
485 | je .first_fragment |
||
486 | sub cx, bx ; If not, dont copy the header |
||
487 | add esi, ebx ; |
||
1473 | hidnplayr | 488 | .first_fragment: |
1159 | hidnplayr | 489 | |
2308 | hidnplayr | 490 | push cx ; First copy dword-wise, then byte-wise |
491 | shr cx, 2 ; |
||
492 | rep movsd ; |
||
493 | pop cx ; |
||
494 | and cx, 3 ; |
||
495 | rep movsb ; |
||
1159 | hidnplayr | 496 | |
2308 | hidnplayr | 497 | push eax |
498 | push edx ; Push pointer to fragment onto stack |
||
499 | mov ebx, [edx + FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet |
||
500 | mov edx, [edx + FRAGMENT_entry.NextPtr] ; Set edx to the next pointer |
||
501 | call kernel_free ; free the previous fragment buffer (this uses the value from stack) |
||
502 | pop eax |
||
503 | cmp edx, -1 ; Check if it is last fragment in chain |
||
504 | jne .rebuild_packet_loop |
||
1159 | hidnplayr | 505 | |
2308 | hidnplayr | 506 | pop ecx |
507 | xchg cl, ch |
||
508 | mov edx, eax |
||
509 | mov [edx + IPv4_header.TotalLength], cx |
||
510 | add esp, 8 |
||
1159 | hidnplayr | 511 | |
2308 | hidnplayr | 512 | xchg cl, ch ; |
1473 | hidnplayr | 513 | |
2308 | hidnplayr | 514 | push ecx ;;;; |
515 | push eax ;;;; |
||
1473 | hidnplayr | 516 | |
517 | ; mov esi, edx ; This prints the IP packet to the debug board (usefull when using serial output debug..) |
||
1159 | hidnplayr | 518 | ; ; |
1529 | hidnplayr | 519 | ; packet_to_debug |
1159 | hidnplayr | 520 | |
2308 | hidnplayr | 521 | jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr |
1249 | hidnplayr | 522 | |
1473 | hidnplayr | 523 | .destroy_slot_pop: |
2308 | hidnplayr | 524 | add esp, 4 |
1473 | hidnplayr | 525 | .destroy_slot: |
2308 | hidnplayr | 526 | DEBUGF 1,"Destroy fragment slot!\n" |
527 | ; TODO! |
||
528 | jmp .dump |
||
1249 | hidnplayr | 529 | |
530 | |||
1159 | hidnplayr | 531 | |
532 | |||
1473 | hidnplayr | 533 | ;----------------------------------- |
534 | ; The IP packet has some options |
||
1159 | hidnplayr | 535 | |
1473 | hidnplayr | 536 | .has_options: |
2308 | hidnplayr | 537 | jmp .dump |
1159 | hidnplayr | 538 | |
539 | |||
1166 | hidnplayr | 540 | |
1159 | hidnplayr | 541 | ;----------------------------------------------------------------- |
542 | ; |
||
543 | ; find fragment slot |
||
544 | ; |
||
1514 | hidnplayr | 545 | ; IN: pointer to fragmented packet in edx |
1159 | hidnplayr | 546 | ; OUT: pointer to slot in edi, -1 on error |
547 | ; |
||
548 | ;----------------------------------------------------------------- |
||
1473 | hidnplayr | 549 | align 4 |
550 | IPv4_find_fragment_slot: |
||
1159 | hidnplayr | 551 | |
1514 | hidnplayr | 552 | ;;; TODO: the RFC says we should check protocol number too |
553 | |||
2308 | hidnplayr | 554 | push eax ebx ecx edx |
555 | mov ax , [edx + IPv4_header.Identification] |
||
556 | mov ecx, MAX_FRAGMENTS |
||
557 | mov esi, FRAGMENT_LIST |
||
558 | mov ebx, [edx + IPv4_header.SourceAddress] |
||
559 | mov edx, [edx + IPv4_header.DestinationAddress] |
||
1159 | hidnplayr | 560 | .find_slot: |
2308 | hidnplayr | 561 | cmp [esi + FRAGMENT_slot.id], ax |
562 | jne .try_next |
||
563 | cmp [esi + FRAGMENT_slot.SrcIP], ebx |
||
564 | jne .try_next |
||
565 | cmp [esi + FRAGMENT_slot.DstIP], edx |
||
566 | je .found_slot |
||
1159 | hidnplayr | 567 | .try_next: |
2308 | hidnplayr | 568 | add esi, sizeof.FRAGMENT_slot |
569 | loop .find_slot |
||
1473 | hidnplayr | 570 | ; pop edx ebx |
2308 | hidnplayr | 571 | or esi, -1 |
1159 | hidnplayr | 572 | ; ret |
573 | |||
574 | .found_slot: |
||
2308 | hidnplayr | 575 | pop edx ecx ebx eax |
576 | ret |
||
1159 | hidnplayr | 577 | |
578 | |||
1514 | hidnplayr | 579 | ;------------------------------------------------------------------ |
1159 | hidnplayr | 580 | ; |
1529 | hidnplayr | 581 | ; IPv4_output |
1514 | hidnplayr | 582 | ; |
1159 | hidnplayr | 583 | ; IN: eax = dest ip |
584 | ; ebx = source ip |
||
585 | ; ecx = data length |
||
1529 | hidnplayr | 586 | ; dx = fragment id |
587 | ; di = TTL shl 8 + protocol |
||
1159 | hidnplayr | 588 | ; |
1249 | hidnplayr | 589 | ; OUT: eax = pointer to buffer start |
590 | ; ebx = pointer to device struct (needed for sending procedure) |
||
1159 | hidnplayr | 591 | ; ecx = unchanged (packet size of embedded data) |
1249 | hidnplayr | 592 | ; edx = size of complete buffer |
1514 | hidnplayr | 593 | ; edi = pointer to start of data (0 on error) |
1159 | hidnplayr | 594 | ; |
1514 | hidnplayr | 595 | ;------------------------------------------------------------------ |
1159 | hidnplayr | 596 | align 4 |
1529 | hidnplayr | 597 | IPv4_output: |
1159 | hidnplayr | 598 | |
2553 | hidnplayr | 599 | DEBUGF 1,"IPv4_output: size=%u\n", ecx |
1159 | hidnplayr | 600 | |
2308 | hidnplayr | 601 | cmp ecx, 65500 ; Max IPv4 packet size |
602 | ja .too_large |
||
1159 | hidnplayr | 603 | |
2308 | hidnplayr | 604 | push ecx eax ebx dx di |
1206 | hidnplayr | 605 | |
2308 | hidnplayr | 606 | call ARP_IP_to_MAC |
1159 | hidnplayr | 607 | |
2308 | hidnplayr | 608 | test eax, 0xffff0000 ; error bits |
609 | jnz .arp_error |
||
1196 | hidnplayr | 610 | |
1530 | hidnplayr | 611 | .continue: |
612 | |||
2308 | hidnplayr | 613 | push ebx ; push the mac |
614 | push ax |
||
1196 | hidnplayr | 615 | |
2308 | hidnplayr | 616 | call IPv4_dest_to_dev |
617 | inc [IP_PACKETS_TX+edi] |
||
618 | mov ebx, [NET_DRV_LIST+edi] |
||
619 | lea eax, [ebx + ETH_DEVICE.mac] |
||
620 | mov edx, esp |
||
621 | mov ecx, [esp + 18] |
||
622 | add ecx, sizeof.IPv4_header |
||
623 | mov di , ETHER_IPv4 |
||
624 | call ETH_output |
||
2555 | hidnplayr | 625 | jz .eth_error |
1159 | hidnplayr | 626 | |
2308 | hidnplayr | 627 | add esp, 6 ; pop the mac |
1529 | hidnplayr | 628 | |
2308 | hidnplayr | 629 | mov [edi + IPv4_header.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header) |
630 | mov [edi + IPv4_header.TypeOfService], 0 ; nothing special, just plain ip packet |
||
631 | mov [edi + IPv4_header.TotalLength], cx |
||
632 | rol [edi + IPv4_header.TotalLength], 8 ; internet byte order |
||
633 | mov [edi + IPv4_header.FlagsAndFragmentOffset], 0x0000 |
||
634 | mov [edi + IPv4_header.HeaderChecksum], 0 |
||
635 | pop word [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
||
2305 | hidnplayr | 636 | ; [edi + IPv4_header.Protocol] |
2308 | hidnplayr | 637 | popw [edi + IPv4_header.Identification] ; fragment id |
638 | popd [edi + IPv4_header.SourceAddress] |
||
639 | popd [edi + IPv4_header.DestinationAddress] |
||
1529 | hidnplayr | 640 | |
2308 | hidnplayr | 641 | pop ecx |
1159 | hidnplayr | 642 | |
2308 | hidnplayr | 643 | IPv4_checksum edi |
644 | add edi, sizeof.IPv4_header |
||
645 | DEBUGF 1,"IPv4 Packet for device %x created successfully\n", ebx |
||
646 | ret |
||
1159 | hidnplayr | 647 | |
2555 | hidnplayr | 648 | .eth_error: |
649 | DEBUGF 1,"IPv4_output: ethernet error\n" |
||
2607 | hidnplayr | 650 | add esp, 3*4+2*2+6 |
2555 | hidnplayr | 651 | sub edi, edi |
652 | ret |
||
653 | |||
1529 | hidnplayr | 654 | .arp_error: |
2555 | hidnplayr | 655 | DEBUGF 1,"IPv4_output: ARP error (0x%x)\n", eax |
2308 | hidnplayr | 656 | add esp, 4+4+4+2+2 |
2555 | hidnplayr | 657 | sub edi, edi |
658 | ret |
||
659 | |||
1529 | hidnplayr | 660 | .too_large: |
2555 | hidnplayr | 661 | DEBUGF 1,"IPv4_output: error: Packet too large!\n" |
2308 | hidnplayr | 662 | sub edi, edi |
663 | ret |
||
1159 | hidnplayr | 664 | |
665 | |||
1541 | hidnplayr | 666 | |
667 | |||
668 | |||
669 | ;------------------------------------------------------------------ |
||
670 | ; |
||
671 | ; IPv4_output_raw |
||
672 | ; |
||
673 | ; IN: eax = socket ptr |
||
674 | ; ecx = data length |
||
675 | ; esi = data ptr |
||
676 | ; |
||
677 | ; OUT: / |
||
678 | ; |
||
679 | ;------------------------------------------------------------------ |
||
680 | align 4 |
||
681 | IPv4_output_raw: |
||
682 | |||
2308 | hidnplayr | 683 | DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax |
1541 | hidnplayr | 684 | |
2308 | hidnplayr | 685 | cmp ecx, 1480 ;;;;; FIXME |
686 | ja .too_large |
||
1541 | hidnplayr | 687 | |
2308 | hidnplayr | 688 | sub esp, 8 |
689 | push esi eax |
||
1541 | hidnplayr | 690 | |
2308 | hidnplayr | 691 | call ARP_IP_to_MAC |
1541 | hidnplayr | 692 | |
2308 | hidnplayr | 693 | test eax, 0xffff0000 ; error bits |
694 | jnz .arp_error |
||
1541 | hidnplayr | 695 | |
696 | .continue: |
||
697 | |||
2308 | hidnplayr | 698 | push ebx ; push the mac |
699 | push ax |
||
1541 | hidnplayr | 700 | |
2308 | hidnplayr | 701 | call IPv4_dest_to_dev |
702 | inc [IP_PACKETS_TX+edi] |
||
703 | mov ebx, [NET_DRV_LIST+edi] |
||
704 | lea eax, [ebx + ETH_DEVICE.mac] |
||
705 | mov edx, esp |
||
706 | mov ecx, [esp + 6+4] |
||
707 | add ecx, sizeof.IPv4_header |
||
708 | mov di, ETHER_IPv4 |
||
709 | call ETH_output |
||
710 | jz .error |
||
1541 | hidnplayr | 711 | |
2308 | hidnplayr | 712 | add esp, 6 ; pop the mac |
1541 | hidnplayr | 713 | |
2308 | hidnplayr | 714 | mov dword[esp+4+4], edx |
715 | mov dword[esp+4+4+4], eax |
||
1541 | hidnplayr | 716 | |
2308 | hidnplayr | 717 | pop eax esi |
1541 | hidnplayr | 718 | ;; todo: check socket options if we should add header, or just compute checksum |
719 | |||
2308 | hidnplayr | 720 | push edi ecx |
721 | rep movsb |
||
722 | pop ecx edi |
||
1541 | hidnplayr | 723 | |
2305 | hidnplayr | 724 | ; [edi + IPv4_header.VersionAndIHL] ; IPv4, normal length (no Optional header) |
725 | ; [edi + IPv4_header.TypeOfService] ; nothing special, just plain ip packet |
||
726 | ; [edi + IPv4_header.TotalLength] |
||
727 | ; [edi + IPv4_header.TotalLength] ; internet byte order |
||
728 | ; [edi + IPv4_header.FlagsAndFragmentOffset] |
||
1541 | hidnplayr | 729 | |
2308 | hidnplayr | 730 | mov [edi + IPv4_header.HeaderChecksum], 0 |
1541 | hidnplayr | 731 | |
2305 | hidnplayr | 732 | ; [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
733 | ; [edi + IPv4_header.Protocol] |
||
734 | ; [edi + IPv4_header.Identification] ; fragment id |
||
735 | ; [edi + IPv4_header.SourceAddress] |
||
736 | ; [edi + IPv4_header.DestinationAddress] |
||
1541 | hidnplayr | 737 | |
2308 | hidnplayr | 738 | IPv4_checksum edi ;;;; todo: checksum for IP packet with options! |
739 | add edi, sizeof.IPv4_header |
||
740 | DEBUGF 1,"IPv4 Packet for device %x created successfully\n", ebx |
||
741 | call [ebx + NET_DEVICE.transmit] |
||
742 | ret |
||
1541 | hidnplayr | 743 | |
744 | .error: |
||
2308 | hidnplayr | 745 | add esp, 6 |
1541 | hidnplayr | 746 | .arp_error: |
2308 | hidnplayr | 747 | add esp, 8+4+4 |
1541 | hidnplayr | 748 | .too_large: |
2308 | hidnplayr | 749 | DEBUGF 1,"IPv4_output_raw: Failed\n" |
750 | sub edi, edi |
||
751 | ret |
||
1541 | hidnplayr | 752 | |
753 | |||
1529 | hidnplayr | 754 | ;-------------------------------------------------------- |
755 | ; |
||
756 | ; |
||
757 | ; IN: dword [esp] = pointer to buffer containing ipv4 packet to be fragmented |
||
758 | ; dword [esp+4] = buffer size |
||
759 | ; esi = pointer to ip header in that buffer |
||
760 | ; ecx = max size of fragments |
||
761 | ; |
||
762 | ; OUT: / |
||
763 | ; |
||
764 | ;-------------------------------------------------------- |
||
1159 | hidnplayr | 765 | |
1482 | hidnplayr | 766 | align 4 |
1529 | hidnplayr | 767 | IPv4_fragment: |
1206 | hidnplayr | 768 | |
2308 | hidnplayr | 769 | DEBUGF 1,"IPv4_fragment\n" |
1482 | hidnplayr | 770 | |
2308 | hidnplayr | 771 | and ecx, not 111b ; align 4 |
1482 | hidnplayr | 772 | |
2308 | hidnplayr | 773 | cmp ecx, sizeof.IPv4_header + 8 ; must be able to put at least 8 bytes |
774 | jb .err2 |
||
1482 | hidnplayr | 775 | |
2308 | hidnplayr | 776 | push esi ecx |
777 | mov eax, [esi + IPv4_header.DestinationAddress] |
||
778 | call ARP_IP_to_MAC |
||
779 | pop ecx esi |
||
780 | cmp eax, -1 |
||
781 | jz .err2 |
||
1482 | hidnplayr | 782 | |
2308 | hidnplayr | 783 | push ebx |
784 | push ax |
||
1482 | hidnplayr | 785 | |
2308 | hidnplayr | 786 | mov ebx, [NET_DRV_LIST] |
787 | lea eax, [ebx + ETH_DEVICE.mac] |
||
788 | push eax |
||
1482 | hidnplayr | 789 | |
790 | |||
2308 | hidnplayr | 791 | push esi ; ptr to ip header |
792 | sub ecx, sizeof.IPv4_header ; substract header size |
||
793 | push ecx ; max data size |
||
794 | push dword 0 ; offset |
||
1482 | hidnplayr | 795 | |
1529 | hidnplayr | 796 | .new_fragment: |
2308 | hidnplayr | 797 | DEBUGF 1,"Ipv4_fragment - new_fragmentn" |
1482 | hidnplayr | 798 | |
799 | |||
2308 | hidnplayr | 800 | mov eax, [esp + 3*4] |
801 | lea ebx, [esp + 4*4] |
||
802 | mov di , ETHER_IPv4 |
||
803 | call ETH_output |
||
1482 | hidnplayr | 804 | |
2308 | hidnplayr | 805 | cmp edi, -1 |
806 | jz .err |
||
1482 | hidnplayr | 807 | |
1529 | hidnplayr | 808 | ; copy header |
2308 | hidnplayr | 809 | mov esi, [esp + 2*4] |
810 | mov ecx, 5 ; 5 dwords: TODO: use IHL field of the header! |
||
811 | rep movsd |
||
1482 | hidnplayr | 812 | |
1529 | hidnplayr | 813 | ; copy data |
2308 | hidnplayr | 814 | mov esi, [esp + 2*4] |
815 | add esi, sizeof.IPv4_header |
||
816 | add esi, [esp] ; offset |
||
1482 | hidnplayr | 817 | |
2308 | hidnplayr | 818 | mov ecx, [esp + 1*4] |
819 | DEBUGF 1,"IPv4_fragment - copying data (%u bytes)\n", ecx |
||
820 | rep movsb |
||
1482 | hidnplayr | 821 | |
1529 | hidnplayr | 822 | ; now, correct header |
2308 | hidnplayr | 823 | mov ecx, [esp + 1*4] |
824 | add ecx, sizeof.IPv4_header |
||
825 | xchg cl, ch |
||
826 | mov [edi + IPv4_header.TotalLength], cx |
||
1482 | hidnplayr | 827 | |
2308 | hidnplayr | 828 | mov ecx, [esp] ; offset |
829 | xchg cl, ch |
||
1482 | hidnplayr | 830 | |
1529 | hidnplayr | 831 | ; cmp dword[esp + 4*4], 0 ; last fragment?;<<<<<< |
832 | ; je .last_fragment |
||
2308 | hidnplayr | 833 | or cx, 1 shl 2 ; more fragments |
1529 | hidnplayr | 834 | ; .last_fragment: |
2308 | hidnplayr | 835 | mov [edi + IPv4_header.FlagsAndFragmentOffset], cx |
1482 | hidnplayr | 836 | |
2308 | hidnplayr | 837 | mov [edi + IPv4_header.HeaderChecksum], 0 |
1482 | hidnplayr | 838 | |
2308 | hidnplayr | 839 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< send the packet |
840 | mov ecx, [esp + 1*4] |
||
1482 | hidnplayr | 841 | |
2308 | hidnplayr | 842 | push edx eax |
843 | IPv4_checksum edi |
||
1529 | hidnplayr | 844 | |
2308 | hidnplayr | 845 | call [ebx + NET_DEVICE.transmit] |
846 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
||
1529 | hidnplayr | 847 | |
2308 | hidnplayr | 848 | mov ecx, [esp+4] |
849 | add [esp], ecx |
||
1529 | hidnplayr | 850 | |
2308 | hidnplayr | 851 | mov ecx, [esp+3*4+6+4] ; ptr to begin of buff |
852 | add ecx, [esp+3*4+6+4+4] ; buff size |
||
853 | sub ecx, [esp+2*4] ; ptr to ip header |
||
854 | add ecx, [esp] ; offset |
||
1529 | hidnplayr | 855 | |
2308 | hidnplayr | 856 | DEBUGF 1,"Ipv4_fragment - bytes remaining: %u\n", ecx |
1529 | hidnplayr | 857 | |
2308 | hidnplayr | 858 | cmp ecx, [esp+1*4] |
859 | jae .new_fragment |
||
1529 | hidnplayr | 860 | |
2308 | hidnplayr | 861 | mov [esp+4], ecx ; set fragment size to remaining packet size |
862 | jmp .new_fragment |
||
1529 | hidnplayr | 863 | |
864 | .err: |
||
2308 | hidnplayr | 865 | DEBUGF 1,"Ipv4_fragment - failed\n" |
1529 | hidnplayr | 866 | .done: |
2308 | hidnplayr | 867 | add esp, 12 + 4 + 6 |
1529 | hidnplayr | 868 | .err2: |
2308 | hidnplayr | 869 | DEBUGF 1,"Ipv4_fragment - dumping\n" |
870 | call kernel_free |
||
871 | add esp, 4 |
||
1529 | hidnplayr | 872 | |
2308 | hidnplayr | 873 | ret |
1529 | hidnplayr | 874 | |
875 | |||
876 | |||
1159 | hidnplayr | 877 | ;--------------------------------------------------------------------------- |
878 | ; |
||
879 | ; IPv4_dest_to_dev |
||
880 | ; |
||
1529 | hidnplayr | 881 | ; IN: eax = Destination IP |
882 | ; OUT: edi = device id * 4 |
||
1159 | hidnplayr | 883 | ; |
884 | ;--------------------------------------------------------------------------- |
||
885 | align 4 |
||
886 | IPv4_dest_to_dev: |
||
887 | |||
2308 | hidnplayr | 888 | cmp eax, 0xffffffff |
889 | je .invalid |
||
1159 | hidnplayr | 890 | |
2308 | hidnplayr | 891 | xor edi, edi |
892 | mov ecx, MAX_IP |
||
1159 | hidnplayr | 893 | |
894 | .loop: |
||
2308 | hidnplayr | 895 | mov ebx, [IP_LIST+edi] |
896 | and ebx, [SUBNET_LIST+edi] |
||
897 | jz .next |
||
1529 | hidnplayr | 898 | |
2308 | hidnplayr | 899 | mov edx, eax |
900 | and edx, [SUBNET_LIST+edi] |
||
1159 | hidnplayr | 901 | |
2308 | hidnplayr | 902 | cmp ebx, edx |
903 | je .found_it |
||
1529 | hidnplayr | 904 | .next: |
2308 | hidnplayr | 905 | add edi, 4 |
906 | loop .loop |
||
1159 | hidnplayr | 907 | |
1529 | hidnplayr | 908 | .invalid: |
2308 | hidnplayr | 909 | xor edi, edi ; if none found, use device 0 as default device |
1159 | hidnplayr | 910 | |
911 | .found_it: |
||
2308 | hidnplayr | 912 | DEBUGF 1,"IPv4_dest_to_dev: %u\n", edi |
1159 | hidnplayr | 913 | |
2308 | hidnplayr | 914 | ret |
1159 | hidnplayr | 915 | |
916 | |||
917 | |||
918 | ;--------------------------------------------------------------------------- |
||
919 | ; |
||
920 | ; IPv4_get_frgmnt_num |
||
921 | ; |
||
922 | ; IN: / |
||
923 | ; OUT: fragment number in ax |
||
924 | ; |
||
925 | ;--------------------------------------------------------------------------- |
||
926 | align 4 |
||
927 | IPv4_get_frgmnt_num: |
||
2308 | hidnplayr | 928 | xor ax, ax ;;; TODO: replace this with real code |
1159 | hidnplayr | 929 | |
2308 | hidnplayr | 930 | ret |
1159 | hidnplayr | 931 | |
932 | |||
933 | ;--------------------------------------------------------------------------- |
||
934 | ; |
||
935 | ; IPv4_API |
||
936 | ; |
||
937 | ; This function is called by system function 75 |
||
938 | ; |
||
939 | ; IN: subfunction number in bl |
||
940 | ; device number in bh |
||
941 | ; ecx, edx, .. depends on subfunction |
||
942 | ; |
||
943 | ; OUT: |
||
944 | ; |
||
945 | ;--------------------------------------------------------------------------- |
||
946 | align 4 |
||
2614 | hidnplayr | 947 | IPv4_api: |
1159 | hidnplayr | 948 | |
2308 | hidnplayr | 949 | movzx eax, bh |
950 | shl eax, 2 |
||
1159 | hidnplayr | 951 | |
2614 | hidnplayr | 952 | and ebx, 0xff |
953 | cmp ebx, .number |
||
954 | ja .error |
||
955 | jmp dword [.table + 4*ebx] |
||
1159 | hidnplayr | 956 | |
2614 | hidnplayr | 957 | .table: |
958 | dd .packets_tx ; 0 |
||
959 | dd .packets_rx ; 1 |
||
960 | dd .write_ip ; 3 |
||
961 | dd .read_dns ; 4 |
||
962 | dd .write_dns ; 5 |
||
963 | dd .read_subnet ; 6 |
||
964 | dd .write_subnet ; 7 |
||
965 | dd .read_gateway ; 8 |
||
966 | dd .write_gateway ; 9 |
||
967 | .number = ($ - .table) / 4 - 1 |
||
968 | |||
1473 | hidnplayr | 969 | .error: |
2308 | hidnplayr | 970 | mov eax, -1 |
971 | ret |
||
1159 | hidnplayr | 972 | |
1473 | hidnplayr | 973 | .packets_tx: |
2614 | hidnplayr | 974 | mov eax, [IP_PACKETS_TX + eax] |
2308 | hidnplayr | 975 | ret |
1159 | hidnplayr | 976 | |
1473 | hidnplayr | 977 | .packets_rx: |
2614 | hidnplayr | 978 | mov eax, [IP_PACKETS_RX + eax] |
2308 | hidnplayr | 979 | ret |
1159 | hidnplayr | 980 | |
1473 | hidnplayr | 981 | .read_ip: |
2614 | hidnplayr | 982 | mov eax, [IP_LIST + eax] |
2308 | hidnplayr | 983 | ret |
1159 | hidnplayr | 984 | |
1473 | hidnplayr | 985 | .write_ip: |
2614 | hidnplayr | 986 | mov [IP_LIST + eax], ecx |
2308 | hidnplayr | 987 | xor eax, eax |
988 | ret |
||
1159 | hidnplayr | 989 | |
1473 | hidnplayr | 990 | .read_dns: |
2614 | hidnplayr | 991 | mov eax, [DNS_LIST + eax] |
2308 | hidnplayr | 992 | ret |
1159 | hidnplayr | 993 | |
1473 | hidnplayr | 994 | .write_dns: |
2614 | hidnplayr | 995 | mov [DNS_LIST + eax], ecx |
2308 | hidnplayr | 996 | xor eax, eax |
997 | ret |
||
1159 | hidnplayr | 998 | |
1473 | hidnplayr | 999 | .read_subnet: |
2614 | hidnplayr | 1000 | mov eax, [SUBNET_LIST + eax] |
2308 | hidnplayr | 1001 | ret |
1159 | hidnplayr | 1002 | |
1473 | hidnplayr | 1003 | .write_subnet: |
2614 | hidnplayr | 1004 | mov [SUBNET_LIST + eax], ecx |
2308 | hidnplayr | 1005 | xor eax, eax |
1006 | ret |
||
1159 | hidnplayr | 1007 | |
1473 | hidnplayr | 1008 | .read_gateway: |
2614 | hidnplayr | 1009 | mov eax, [GATEWAY_LIST + eax] |
2308 | hidnplayr | 1010 | ret |
1159 | hidnplayr | 1011 | |
1473 | hidnplayr | 1012 | .write_gateway: |
2614 | hidnplayr | 1013 | mov [GATEWAY_LIST + eax], ecx |
2308 | hidnplayr | 1014 | xor eax, eax |
1015 | ret |