Rev 2302 | 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: 2305 $ |
1159 | hidnplayr | 20 | |
1514 | hidnplayr | 21 | MAX_FRAGMENTS equ 64 |
1159 | hidnplayr | 22 | MAX_IP equ MAX_NET_DEVICES |
1514 | hidnplayr | 23 | IP_MAX_INTERFACES equ MAX_IP |
1159 | hidnplayr | 24 | |
2305 | hidnplayr | 25 | struct IPv4_header |
26 | |||
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 ? |
||
37 | |||
1159 | hidnplayr | 38 | ends |
39 | |||
40 | struct FRAGMENT_slot |
||
2305 | hidnplayr | 41 | |
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 |
||
47 | |||
1159 | hidnplayr | 48 | ends |
49 | |||
50 | struct FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets |
||
2305 | hidnplayr | 51 | |
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 | |
1530 | 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 | |
1530 | hidnplayr | 68 | IP_PACKETS_TX rd MAX_IP |
69 | IP_PACKETS_RX rd MAX_IP |
||
70 | |||
2305 | 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 | ;----------------------------------------------------------------- |
||
82 | macro IPv4_init { |
||
83 | |||
84 | xor eax, eax |
||
85 | mov edi, IP_LIST |
||
86 | mov ecx, 4*MAX_IP |
||
87 | rep stosd |
||
88 | |||
89 | mov edi, FRAGMENT_LIST |
||
2305 | hidnplayr | 90 | mov ecx, sizeof.FRAGMENT_slot*MAX_FRAGMENTS/4 + 2*MAX_IP |
1530 | hidnplayr | 91 | rep stosd |
92 | |||
93 | } |
||
94 | |||
95 | |||
96 | ;----------------------------------------------------------------- |
||
97 | ; |
||
98 | ; Decrease TimeToLive of all fragment slots |
||
99 | ; |
||
100 | ;----------------------------------------------------------------- |
||
101 | macro IPv4_decrease_fragment_ttls { |
||
102 | |||
103 | local .loop |
||
104 | |||
105 | mov esi, FRAGMENT_LIST |
||
106 | mov ecx, MAX_FRAGMENTS |
||
107 | .loop: |
||
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" |
||
113 | ;;; TODO: clear all entry's of timed-out slot |
||
114 | .try_next: |
||
115 | add esi, 4 |
||
116 | loop .loop |
||
117 | } |
||
118 | |||
119 | |||
120 | |||
1529 | hidnplayr | 121 | macro IPv4_checksum ptr { |
122 | |||
123 | ; This is the fast procedure to create or check a IP header without options |
||
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 | |||
127 | push ebx |
||
128 | xor ebx, ebx |
||
129 | add bl, [ptr+1] |
||
130 | adc bh, [ptr+0] |
||
131 | |||
132 | adc bl, [ptr+3] |
||
133 | adc bh, [ptr+2] |
||
134 | |||
135 | adc bl, [ptr+5] |
||
136 | adc bh, [ptr+4] |
||
137 | |||
138 | adc bl, [ptr+7] |
||
139 | adc bh, [ptr+6] |
||
140 | |||
141 | adc bl, [ptr+9] |
||
142 | adc bh, [ptr+8] |
||
143 | |||
144 | ; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation |
||
145 | |||
146 | adc bl, [ptr+13] |
||
147 | adc bh, [ptr+12] |
||
148 | |||
149 | adc bl, [ptr+15] |
||
150 | adc bh, [ptr+14] |
||
151 | |||
152 | adc bl, [ptr+17] |
||
153 | adc bh, [ptr+16] |
||
154 | |||
155 | adc bl, [ptr+19] |
||
156 | adc bh, [ptr+18] |
||
157 | |||
158 | adc ebx, 0 |
||
159 | |||
160 | push ecx |
||
161 | mov ecx, ebx |
||
162 | shr ecx, 16 |
||
163 | and ebx, 0xffff |
||
164 | add ebx, ecx |
||
165 | |||
166 | mov ecx, ebx |
||
167 | shr ecx, 16 |
||
168 | add ebx, ecx |
||
169 | |||
170 | not bx |
||
171 | jnz .not_zero |
||
172 | dec bx |
||
173 | .not_zero: |
||
174 | xchg bl, bh |
||
175 | pop ecx |
||
176 | |||
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 |
||
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 |
||
197 | ; pointer to IP Packet data in edx |
||
198 | ; OUT: / |
||
199 | ; |
||
200 | ;----------------------------------------------------------------- |
||
201 | align 4 |
||
1529 | hidnplayr | 202 | IPv4_input: ; TODO: implement handler for IP options |
1514 | hidnplayr | 203 | ; TODO2: add code for raw sockets |
1159 | hidnplayr | 204 | |
1514 | hidnplayr | 205 | DEBUGF 1,"IPv4_Handler, packet from: %u.%u.%u.%u ",\ |
2305 | hidnplayr | 206 | [edx + IPv4_header.SourceAddress]:1,[edx + IPv4_header.SourceAddress + 1]:1,[edx + IPv4_header.SourceAddress + 2]:1,[edx + IPv4_header.SourceAddress + 3]:1 |
1514 | hidnplayr | 207 | DEBUGF 1,"to: %u.%u.%u.%u\n",\ |
2305 | hidnplayr | 208 | [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 | 209 | |
1473 | hidnplayr | 210 | ;------------------------------------------- |
211 | ; Check if the packet still has time to live |
||
1159 | hidnplayr | 212 | |
2305 | hidnplayr | 213 | cmp byte [edx + IPv4_header.TimeToLive], 0 |
1473 | hidnplayr | 214 | je .dump |
215 | |||
216 | ;-------------------------------------- |
||
217 | ; First, check if IP packet has options |
||
218 | |||
2305 | hidnplayr | 219 | movzx eax, [edx + IPv4_header.VersionAndIHL] |
1473 | hidnplayr | 220 | and al , 0x0f ; get IHL(header length) |
221 | cmp al , 0x05 ; IHL!= 5*4(20 bytes) |
||
222 | jnz .has_options |
||
223 | |||
224 | ;------------------------------- |
||
1514 | hidnplayr | 225 | ; Now, re-calculate the checksum |
1473 | hidnplayr | 226 | |
1529 | hidnplayr | 227 | IPv4_checksum edx |
228 | jnz .dump ; if checksum isn't valid then dump packet |
||
1249 | hidnplayr | 229 | |
1473 | hidnplayr | 230 | DEBUGF 1,"IPv4 Checksum is correct\n" |
1254 | hidnplayr | 231 | |
1514 | hidnplayr | 232 | ;----------------------------------- |
233 | ; Check if destination IP is correct |
||
1473 | hidnplayr | 234 | |
1514 | hidnplayr | 235 | call NET_ptr_to_num |
236 | shl edi, 2 |
||
1473 | hidnplayr | 237 | |
1514 | hidnplayr | 238 | ; check if it matches local ip |
1473 | hidnplayr | 239 | |
2302 | hidnplayr | 240 | mov eax, [IP_LIST+edi] |
2305 | hidnplayr | 241 | cmp [edx + IPv4_header.DestinationAddress], eax |
1514 | hidnplayr | 242 | je .ip_ok |
1159 | hidnplayr | 243 | |
1514 | hidnplayr | 244 | ; check for broadcast |
245 | |||
2301 | hidnplayr | 246 | mov eax, [SUBNET_LIST+edi] |
1159 | hidnplayr | 247 | not eax |
2301 | hidnplayr | 248 | or eax, [IP_LIST+edi] |
2305 | hidnplayr | 249 | cmp [edx + IPv4_header.DestinationAddress], eax |
1514 | hidnplayr | 250 | je .ip_ok |
1159 | hidnplayr | 251 | |
1514 | hidnplayr | 252 | ; or a special broadcast |
1159 | hidnplayr | 253 | |
2305 | hidnplayr | 254 | cmp [edx + IPv4_header.DestinationAddress], -1 |
1514 | hidnplayr | 255 | je .ip_ok |
1473 | hidnplayr | 256 | |
1519 | hidnplayr | 257 | ; maybe it's a multicast then |
258 | |||
2305 | hidnplayr | 259 | mov eax, [edx + IPv4_header.DestinationAddress] |
1519 | hidnplayr | 260 | and eax, 0xff000000 |
1514 | hidnplayr | 261 | ; cmp eax, 224 shl 24 |
262 | ; je .ip_ok |
||
1159 | hidnplayr | 263 | |
1514 | hidnplayr | 264 | ; or a loopback address |
1473 | hidnplayr | 265 | |
1514 | hidnplayr | 266 | cmp eax, 127 shl 24 |
267 | je .ip_ok |
||
1473 | hidnplayr | 268 | |
1514 | hidnplayr | 269 | ; or it's not meant for us.. |
1159 | hidnplayr | 270 | |
1514 | hidnplayr | 271 | DEBUGF 2,"Destination address does not match!\n" |
272 | jmp .dump |
||
1159 | hidnplayr | 273 | |
1514 | hidnplayr | 274 | ;------------------------ |
275 | ; Now we can update stats |
||
1159 | hidnplayr | 276 | |
1514 | hidnplayr | 277 | .ip_ok: |
278 | inc [IP_PACKETS_RX+edi] |
||
1159 | hidnplayr | 279 | |
1473 | hidnplayr | 280 | ;---------------------------------- |
281 | ; Check if the packet is fragmented |
||
1159 | hidnplayr | 282 | |
2305 | hidnplayr | 283 | test [edx + IPv4_header.FlagsAndFragmentOffset], 1 shl 5 ; Is 'more fragments' flag set ? |
1473 | hidnplayr | 284 | jnz .has_fragments ; If so, we definately have a fragmented packet |
1159 | hidnplayr | 285 | |
2305 | hidnplayr | 286 | 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 |
1473 | hidnplayr | 287 | jnz .is_last_fragment |
288 | |||
289 | ;------------------------------------------------------------------- |
||
290 | ; No, it's just a regular IP packet, pass it to the higher protocols |
||
291 | |||
292 | .handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed |
||
2305 | hidnplayr | 293 | movzx eax, [edx + IPv4_header.VersionAndIHL] ; Calculate Header length by using IHL field |
1514 | hidnplayr | 294 | and eax, 0x0000000f ; |
1159 | hidnplayr | 295 | shl eax, 2 ; |
2305 | hidnplayr | 296 | movzx ecx, [edx + IPv4_header.TotalLength] ; Calculate length of encapsulated Packet |
1159 | hidnplayr | 297 | xchg cl , ch ; |
298 | sub ecx, eax ; |
||
299 | |||
300 | add eax, edx |
||
301 | push eax |
||
1473 | hidnplayr | 302 | |
2305 | hidnplayr | 303 | mov esi, [edx + IPv4_header.SourceAddress] ; These values might be of interest to the higher protocols |
304 | mov edi, [edx + IPv4_header.DestinationAddress] ; |
||
305 | mov al , [edx + IPv4_header.Protocol] |
||
1159 | hidnplayr | 306 | pop edx ; Offset to data (tcp/udp/icmp/.. Packet) |
307 | |||
308 | cmp al , IP_PROTO_TCP |
||
1514 | hidnplayr | 309 | je TCP_input |
1159 | hidnplayr | 310 | |
311 | cmp al , IP_PROTO_UDP |
||
1514 | hidnplayr | 312 | je UDP_input |
1159 | hidnplayr | 313 | |
314 | cmp al , IP_PROTO_ICMP |
||
1514 | hidnplayr | 315 | je ICMP_input |
1159 | hidnplayr | 316 | |
1473 | hidnplayr | 317 | DEBUGF 2,"unknown Internet protocol: %u\n", al |
1159 | hidnplayr | 318 | |
319 | .dump: |
||
1473 | hidnplayr | 320 | DEBUGF 2,"IP_Handler - dumping\n" |
1159 | hidnplayr | 321 | ; inc [dumped_rx_count] |
322 | call kernel_free |
||
323 | add esp, 4 ; pop (balance stack) |
||
324 | ret |
||
325 | |||
326 | |||
1473 | hidnplayr | 327 | ;--------------------------- |
328 | ; Fragmented packet handler |
||
329 | |||
330 | |||
331 | .has_fragments: |
||
2305 | hidnplayr | 332 | movzx eax, [edx + IPv4_header.FlagsAndFragmentOffset] |
1473 | hidnplayr | 333 | xchg al , ah |
1159 | hidnplayr | 334 | shl ax , 3 |
1473 | hidnplayr | 335 | |
2305 | hidnplayr | 336 | DEBUGF 1,"Fragmented packet, offset:%u, id:%x\n", ax, [edx + IPv4_header.Identification]:4 |
1159 | hidnplayr | 337 | |
338 | test ax , ax ; Is this the first packet of the fragment? |
||
1473 | hidnplayr | 339 | jz .is_first_fragment |
1159 | hidnplayr | 340 | |
1473 | hidnplayr | 341 | |
342 | ;------------------------------------------------------- |
||
343 | ; We have a fragmented IP packet, but it's not the first |
||
344 | |||
345 | DEBUGF 1,"Middle fragmented packet received!\n" |
||
346 | |||
347 | call IPv4_find_fragment_slot |
||
348 | cmp esi, -1 |
||
349 | je .dump |
||
350 | |||
2302 | hidnplayr | 351 | mov [esi + FRAGMENT_slot.ttl], 15 ; Reset the ttl |
1473 | hidnplayr | 352 | mov esi, [esi + FRAGMENT_slot.ptr] |
353 | or edi, -1 |
||
354 | .find_last_entry: ; The following routine will try to find the last entry |
||
355 | cmp edi, [esi + FRAGMENT_entry.PrevPtr] |
||
356 | jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
||
357 | mov edi, esi |
||
358 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
||
359 | cmp esi, -1 |
||
360 | jne .find_last_entry |
||
361 | ; We found the last entry (pointer is now in edi) |
||
362 | ; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure |
||
363 | |||
364 | pop eax ; pointer to packet |
||
365 | mov [edi + FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry |
||
366 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
||
367 | mov [eax + FRAGMENT_entry.PrevPtr], edi |
||
368 | mov [eax + FRAGMENT_entry.Owner], ebx |
||
369 | |||
370 | add esp, 4 |
||
371 | ret |
||
372 | |||
373 | |||
374 | ;------------------------------------ |
||
375 | ; We have received the first fragment |
||
376 | |||
377 | .is_first_fragment: |
||
1159 | hidnplayr | 378 | DEBUGF 1,"First fragmented packet received!\n" |
379 | ; try to locate a free slot.. |
||
380 | mov ecx, MAX_FRAGMENTS |
||
381 | mov esi, FRAGMENT_LIST |
||
1473 | hidnplayr | 382 | .find_free_slot: |
1159 | hidnplayr | 383 | cmp word [esi + FRAGMENT_slot.ttl], 0 |
384 | je .found_free_slot |
||
2305 | hidnplayr | 385 | add esi, sizeof.FRAGMENT_slot |
1159 | hidnplayr | 386 | loop .find_free_slot |
387 | jmp .dump ; If no free slot was found, dump the packet |
||
388 | |||
1473 | hidnplayr | 389 | .found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure |
2302 | hidnplayr | 390 | mov [esi + FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl |
2305 | hidnplayr | 391 | mov ax , [edx + IPv4_header.Identification] |
2302 | hidnplayr | 392 | mov [esi + FRAGMENT_slot.id], ax |
2305 | hidnplayr | 393 | mov eax,[edx + IPv4_header.SourceAddress] |
2302 | hidnplayr | 394 | mov [esi + FRAGMENT_slot.SrcIP], eax |
2305 | hidnplayr | 395 | mov eax, [edx + IPv4_header.DestinationAddress] |
2302 | hidnplayr | 396 | mov [esi + FRAGMENT_slot.DstIP], eax |
1159 | hidnplayr | 397 | pop eax |
2302 | hidnplayr | 398 | mov [esi + FRAGMENT_slot.ptr], eax |
1159 | hidnplayr | 399 | ; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure |
400 | mov [eax + FRAGMENT_entry.NextPtr], -1 |
||
401 | mov [eax + FRAGMENT_entry.PrevPtr], -1 |
||
402 | mov [eax + FRAGMENT_entry.Owner], ebx |
||
403 | |||
404 | add esp, 4 ; balance stack and exit |
||
405 | ret |
||
406 | |||
407 | |||
1473 | hidnplayr | 408 | ;----------------------------------- |
409 | ; We have received the last fragment |
||
1159 | hidnplayr | 410 | |
1473 | hidnplayr | 411 | .is_last_fragment: |
412 | DEBUGF 1,"Last fragmented packet received!\n" |
||
1159 | hidnplayr | 413 | |
1473 | hidnplayr | 414 | call IPv4_find_fragment_slot |
1159 | hidnplayr | 415 | cmp esi, -1 |
416 | je .dump |
||
417 | |||
418 | 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 |
||
419 | push esi |
||
1473 | hidnplayr | 420 | xor eax, eax |
1159 | hidnplayr | 421 | or edi, -1 |
1473 | hidnplayr | 422 | |
423 | .count_bytes: |
||
1159 | hidnplayr | 424 | cmp [esi + FRAGMENT_entry.PrevPtr], edi |
2302 | hidnplayr | 425 | jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!) |
2305 | hidnplayr | 426 | mov cx, [esi + sizeof.FRAGMENT_entry + IPv4_header.TotalLength] ; Add total length |
1159 | hidnplayr | 427 | xchg cl, ch |
428 | DEBUGF 1,"Packet size: %u\n", cx |
||
429 | add ax, cx |
||
2305 | hidnplayr | 430 | movzx cx, [esi + sizeof.FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Sub Header length |
1159 | hidnplayr | 431 | and cx, 0x000F |
432 | shl cx, 2 |
||
433 | DEBUGF 1,"Header size: %u\n", cx |
||
434 | sub ax, cx |
||
435 | mov edi, esi |
||
436 | mov esi, [esi + FRAGMENT_entry.NextPtr] |
||
437 | cmp esi, -1 |
||
438 | jne .count_bytes |
||
439 | |||
1514 | hidnplayr | 440 | mov esi, [esp+4] |
1159 | hidnplayr | 441 | mov [edi + FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code |
442 | mov [esi + FRAGMENT_entry.NextPtr], -1 |
||
443 | mov [esi + FRAGMENT_entry.PrevPtr], edi |
||
444 | mov [esi + FRAGMENT_entry.Owner], ebx |
||
445 | |||
2305 | hidnplayr | 446 | mov cx, [edx + IPv4_header.TotalLength] ; Note: This time we dont substract Header length |
1159 | hidnplayr | 447 | xchg cl , ch |
448 | DEBUGF 1,"Packet size: %u\n", cx |
||
449 | add ax , cx |
||
450 | DEBUGF 1,"Total Received data size: %u\n", eax |
||
451 | |||
452 | push eax |
||
2305 | hidnplayr | 453 | mov ax , [edx + IPv4_header.FlagsAndFragmentOffset] |
1159 | hidnplayr | 454 | xchg al , ah |
455 | shl ax , 3 |
||
456 | add cx , ax |
||
457 | pop eax |
||
458 | DEBUGF 1,"Total Fragment size: %u\n", ecx |
||
459 | |||
460 | cmp ax, cx |
||
461 | jne .destroy_slot_pop |
||
462 | |||
463 | push eax |
||
464 | push eax |
||
465 | call kernel_alloc |
||
466 | test eax, eax |
||
467 | je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot |
||
468 | mov edx, [esp+4] ; Get pointer to first fragment entry back in edx |
||
469 | |||
1473 | hidnplayr | 470 | .rebuild_packet_loop: |
2305 | hidnplayr | 471 | movzx ecx, [edx + sizeof.FRAGMENT_entry + IPv4_header.FlagsAndFragmentOffset] ; Calculate the fragment offset |
2302 | hidnplayr | 472 | xchg cl , ch ; intel byte order |
473 | shl cx , 3 ; multiply by 8 and clear first 3 bits |
||
1159 | hidnplayr | 474 | DEBUGF 1,"Fragment offset: %u\n", cx |
475 | |||
2302 | hidnplayr | 476 | lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment |
2305 | hidnplayr | 477 | movzx ebx, [edx + sizeof.FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment |
2302 | hidnplayr | 478 | and bx , 0x000F ; |
479 | shl bx , 2 ; |
||
1159 | hidnplayr | 480 | |
2305 | hidnplayr | 481 | lea esi, [edx + sizeof.FRAGMENT_entry] ; Set esi to the correct begin of fragment |
482 | movzx ecx, [edx + sizeof.FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment |
||
2302 | hidnplayr | 483 | xchg cl, ch ; intel byte order |
1159 | hidnplayr | 484 | |
2302 | hidnplayr | 485 | cmp edi, eax ; Is this packet the first fragment ? |
1159 | hidnplayr | 486 | je .first_fragment |
2302 | hidnplayr | 487 | sub cx, bx ; If not, dont copy the header |
488 | add esi, ebx ; |
||
1473 | hidnplayr | 489 | .first_fragment: |
1159 | hidnplayr | 490 | |
2302 | hidnplayr | 491 | push cx ; First copy dword-wise, then byte-wise |
492 | shr cx, 2 ; |
||
493 | rep movsd ; |
||
494 | pop cx ; |
||
495 | and cx, 3 ; |
||
496 | rep movsb ; |
||
1159 | hidnplayr | 497 | |
498 | push eax |
||
2302 | hidnplayr | 499 | push edx ; Push pointer to fragment onto stack |
500 | mov ebx, [edx + FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet |
||
501 | mov edx, [edx + FRAGMENT_entry.NextPtr] ; Set edx to the next pointer |
||
502 | call kernel_free ; free the previous fragment buffer (this uses the value from stack) |
||
1159 | hidnplayr | 503 | pop eax |
2302 | hidnplayr | 504 | cmp edx, -1 ; Check if it is last fragment in chain |
1159 | hidnplayr | 505 | jne .rebuild_packet_loop |
506 | |||
2302 | hidnplayr | 507 | pop ecx |
1159 | hidnplayr | 508 | xchg cl, ch |
509 | mov edx, eax |
||
2305 | hidnplayr | 510 | mov [edx + IPv4_header.TotalLength], cx |
1159 | hidnplayr | 511 | add esp, 8 |
512 | |||
1473 | hidnplayr | 513 | xchg cl, ch ; |
514 | |||
515 | push ecx ;;;; |
||
516 | push eax ;;;; |
||
517 | |||
518 | ; mov esi, edx ; This prints the IP packet to the debug board (usefull when using serial output debug..) |
||
1159 | hidnplayr | 519 | ; ; |
1529 | hidnplayr | 520 | ; packet_to_debug |
1159 | hidnplayr | 521 | |
1473 | hidnplayr | 522 | jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr |
1249 | hidnplayr | 523 | |
1473 | hidnplayr | 524 | .destroy_slot_pop: |
525 | add esp, 4 |
||
526 | .destroy_slot: |
||
527 | DEBUGF 1,"Destroy fragment slot!\n" |
||
528 | ; TODO! |
||
529 | jmp .dump |
||
1249 | hidnplayr | 530 | |
531 | |||
1159 | hidnplayr | 532 | |
533 | |||
1473 | hidnplayr | 534 | ;----------------------------------- |
535 | ; The IP packet has some options |
||
1159 | hidnplayr | 536 | |
1473 | hidnplayr | 537 | .has_options: |
538 | jmp .dump |
||
1159 | hidnplayr | 539 | |
540 | |||
1166 | hidnplayr | 541 | |
1159 | hidnplayr | 542 | ;----------------------------------------------------------------- |
543 | ; |
||
544 | ; find fragment slot |
||
545 | ; |
||
1514 | hidnplayr | 546 | ; IN: pointer to fragmented packet in edx |
1159 | hidnplayr | 547 | ; OUT: pointer to slot in edi, -1 on error |
548 | ; |
||
549 | ;----------------------------------------------------------------- |
||
1473 | hidnplayr | 550 | align 4 |
551 | IPv4_find_fragment_slot: |
||
1159 | hidnplayr | 552 | |
1514 | hidnplayr | 553 | ;;; TODO: the RFC says we should check protocol number too |
554 | |||
1159 | hidnplayr | 555 | push eax ebx ecx edx |
2305 | hidnplayr | 556 | mov ax , [edx + IPv4_header.Identification] |
1159 | hidnplayr | 557 | mov ecx, MAX_FRAGMENTS |
558 | mov esi, FRAGMENT_LIST |
||
2305 | hidnplayr | 559 | mov ebx, [edx + IPv4_header.SourceAddress] |
560 | mov edx, [edx + IPv4_header.DestinationAddress] |
||
1159 | hidnplayr | 561 | .find_slot: |
2302 | hidnplayr | 562 | cmp [esi + FRAGMENT_slot.id], ax |
1159 | hidnplayr | 563 | jne .try_next |
2302 | hidnplayr | 564 | cmp [esi + FRAGMENT_slot.SrcIP], ebx |
1159 | hidnplayr | 565 | jne .try_next |
2302 | hidnplayr | 566 | cmp [esi + FRAGMENT_slot.DstIP], edx |
1159 | hidnplayr | 567 | je .found_slot |
568 | .try_next: |
||
2305 | hidnplayr | 569 | add esi, sizeof.FRAGMENT_slot |
1159 | hidnplayr | 570 | loop .find_slot |
1473 | hidnplayr | 571 | ; pop edx ebx |
1159 | hidnplayr | 572 | or esi, -1 |
573 | ; ret |
||
574 | |||
575 | .found_slot: |
||
576 | pop edx ecx ebx eax |
||
577 | ret |
||
578 | |||
579 | |||
1514 | hidnplayr | 580 | ;------------------------------------------------------------------ |
1159 | hidnplayr | 581 | ; |
1529 | hidnplayr | 582 | ; IPv4_output |
1514 | hidnplayr | 583 | ; |
1159 | hidnplayr | 584 | ; IN: eax = dest ip |
585 | ; ebx = source ip |
||
586 | ; ecx = data length |
||
1529 | hidnplayr | 587 | ; dx = fragment id |
588 | ; di = TTL shl 8 + protocol |
||
1159 | hidnplayr | 589 | ; |
1249 | hidnplayr | 590 | ; OUT: eax = pointer to buffer start |
591 | ; ebx = pointer to device struct (needed for sending procedure) |
||
1159 | hidnplayr | 592 | ; ecx = unchanged (packet size of embedded data) |
1249 | hidnplayr | 593 | ; edx = size of complete buffer |
1514 | hidnplayr | 594 | ; edi = pointer to start of data (0 on error) |
1159 | hidnplayr | 595 | ; |
1514 | hidnplayr | 596 | ;------------------------------------------------------------------ |
1159 | hidnplayr | 597 | align 4 |
1529 | hidnplayr | 598 | IPv4_output: |
1159 | hidnplayr | 599 | |
1838 | hidnplayr | 600 | DEBUGF 1,"IPv4_create_packet: size=%u\n", ecx |
1159 | hidnplayr | 601 | |
1529 | hidnplayr | 602 | cmp ecx, 65500 ; Max IPv4 packet size |
2300 | hidnplayr | 603 | ja .too_large |
1159 | hidnplayr | 604 | |
1206 | hidnplayr | 605 | push ecx eax ebx dx di |
606 | |||
1196 | hidnplayr | 607 | call ARP_IP_to_MAC |
1159 | hidnplayr | 608 | |
1529 | hidnplayr | 609 | test eax, 0xffff0000 ; error bits |
610 | jnz .arp_error |
||
1196 | hidnplayr | 611 | |
1530 | hidnplayr | 612 | .continue: |
613 | |||
1529 | hidnplayr | 614 | push ebx ; push the mac |
1196 | hidnplayr | 615 | push ax |
616 | |||
1159 | hidnplayr | 617 | call IPv4_dest_to_dev |
1529 | hidnplayr | 618 | inc [IP_PACKETS_TX+edi] |
619 | mov ebx, [NET_DRV_LIST+edi] |
||
620 | lea eax, [ebx + ETH_DEVICE.mac] |
||
621 | mov edx, esp |
||
622 | mov ecx, [esp + 18] |
||
2305 | hidnplayr | 623 | add ecx, sizeof.IPv4_header |
1159 | hidnplayr | 624 | mov di , ETHER_IPv4 |
1529 | hidnplayr | 625 | call ETH_output |
626 | jz .error |
||
1159 | hidnplayr | 627 | |
1529 | hidnplayr | 628 | add esp, 6 ; pop the mac |
629 | |||
2305 | hidnplayr | 630 | mov [edi + IPv4_header.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header) |
631 | mov [edi + IPv4_header.TypeOfService], 0 ; nothing special, just plain ip packet |
||
632 | mov [edi + IPv4_header.TotalLength], cx |
||
633 | rol [edi + IPv4_header.TotalLength], 8 ; internet byte order |
||
634 | mov [edi + IPv4_header.FlagsAndFragmentOffset], 0x0000 |
||
635 | mov [edi + IPv4_header.HeaderChecksum], 0 |
||
636 | pop word [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
||
637 | ; [edi + IPv4_header.Protocol] |
||
638 | popw [edi + IPv4_header.Identification] ; fragment id |
||
639 | popd [edi + IPv4_header.SourceAddress] |
||
640 | popd [edi + IPv4_header.DestinationAddress] |
||
1529 | hidnplayr | 641 | |
1159 | hidnplayr | 642 | pop ecx |
643 | |||
1529 | hidnplayr | 644 | IPv4_checksum edi |
2305 | hidnplayr | 645 | add edi, sizeof.IPv4_header |
1514 | hidnplayr | 646 | DEBUGF 1,"IPv4 Packet for device %x created successfully\n", ebx |
1159 | hidnplayr | 647 | ret |
648 | |||
1529 | hidnplayr | 649 | .error: |
650 | add esp, 6 |
||
651 | .arp_error: |
||
652 | add esp, 4+4+4+2+2 |
||
653 | .too_large: |
||
654 | DEBUGF 1,"IPv4_create_packet: Failed\n" |
||
655 | sub edi, edi |
||
1159 | hidnplayr | 656 | ret |
657 | |||
658 | |||
1541 | hidnplayr | 659 | |
660 | |||
661 | |||
662 | ;------------------------------------------------------------------ |
||
663 | ; |
||
664 | ; IPv4_output_raw |
||
665 | ; |
||
666 | ; IN: eax = socket ptr |
||
667 | ; ecx = data length |
||
668 | ; esi = data ptr |
||
669 | ; |
||
670 | ; OUT: / |
||
671 | ; |
||
672 | ;------------------------------------------------------------------ |
||
673 | align 4 |
||
674 | IPv4_output_raw: |
||
675 | |||
676 | DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax |
||
677 | |||
2301 | hidnplayr | 678 | cmp ecx, 1480 ;;;;; FIXME |
2300 | hidnplayr | 679 | ja .too_large |
1541 | hidnplayr | 680 | |
681 | sub esp, 8 |
||
682 | push esi eax |
||
683 | |||
684 | call ARP_IP_to_MAC |
||
685 | |||
686 | test eax, 0xffff0000 ; error bits |
||
687 | jnz .arp_error |
||
688 | |||
689 | .continue: |
||
690 | |||
691 | push ebx ; push the mac |
||
692 | push ax |
||
693 | |||
694 | call IPv4_dest_to_dev |
||
695 | inc [IP_PACKETS_TX+edi] |
||
696 | mov ebx, [NET_DRV_LIST+edi] |
||
697 | lea eax, [ebx + ETH_DEVICE.mac] |
||
698 | mov edx, esp |
||
699 | mov ecx, [esp + 6+4] |
||
2305 | hidnplayr | 700 | add ecx, sizeof.IPv4_header |
1541 | hidnplayr | 701 | mov di, ETHER_IPv4 |
702 | call ETH_output |
||
703 | jz .error |
||
704 | |||
705 | add esp, 6 ; pop the mac |
||
706 | |||
707 | mov dword[esp+4+4], edx |
||
708 | mov dword[esp+4+4+4], eax |
||
709 | |||
710 | pop eax esi |
||
711 | ;; todo: check socket options if we should add header, or just compute checksum |
||
712 | |||
713 | push edi ecx |
||
714 | rep movsb |
||
715 | pop ecx edi |
||
716 | |||
2305 | hidnplayr | 717 | ; [edi + IPv4_header.VersionAndIHL] ; IPv4, normal length (no Optional header) |
718 | ; [edi + IPv4_header.TypeOfService] ; nothing special, just plain ip packet |
||
719 | ; [edi + IPv4_header.TotalLength] |
||
720 | ; [edi + IPv4_header.TotalLength] ; internet byte order |
||
721 | ; [edi + IPv4_header.FlagsAndFragmentOffset] |
||
1541 | hidnplayr | 722 | |
2305 | hidnplayr | 723 | mov [edi + IPv4_header.HeaderChecksum], 0 |
1541 | hidnplayr | 724 | |
2305 | hidnplayr | 725 | ; [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol |
726 | ; [edi + IPv4_header.Protocol] |
||
727 | ; [edi + IPv4_header.Identification] ; fragment id |
||
728 | ; [edi + IPv4_header.SourceAddress] |
||
729 | ; [edi + IPv4_header.DestinationAddress] |
||
1541 | hidnplayr | 730 | |
731 | IPv4_checksum edi ;;;; todo: checksum for IP packet with options! |
||
2305 | hidnplayr | 732 | add edi, sizeof.IPv4_header |
1541 | hidnplayr | 733 | DEBUGF 1,"IPv4 Packet for device %x created successfully\n", ebx |
734 | call [ebx + NET_DEVICE.transmit] |
||
735 | ret |
||
736 | |||
737 | .error: |
||
738 | add esp, 6 |
||
739 | .arp_error: |
||
740 | add esp, 8+4+4 |
||
741 | .too_large: |
||
742 | DEBUGF 1,"IPv4_output_raw: Failed\n" |
||
743 | sub edi, edi |
||
744 | ret |
||
745 | |||
746 | |||
1529 | hidnplayr | 747 | ;-------------------------------------------------------- |
748 | ; |
||
749 | ; |
||
750 | ; IN: dword [esp] = pointer to buffer containing ipv4 packet to be fragmented |
||
751 | ; dword [esp+4] = buffer size |
||
752 | ; esi = pointer to ip header in that buffer |
||
753 | ; ecx = max size of fragments |
||
754 | ; |
||
755 | ; OUT: / |
||
756 | ; |
||
757 | ;-------------------------------------------------------- |
||
1159 | hidnplayr | 758 | |
1482 | hidnplayr | 759 | align 4 |
1529 | hidnplayr | 760 | IPv4_fragment: |
1206 | hidnplayr | 761 | |
1529 | hidnplayr | 762 | DEBUGF 1,"IPv4_fragment\n" |
1482 | hidnplayr | 763 | |
1529 | hidnplayr | 764 | and ecx, not 111b ; align 4 |
1482 | hidnplayr | 765 | |
2305 | hidnplayr | 766 | cmp ecx, sizeof.IPv4_header + 8 ; must be able to put at least 8 bytes |
2300 | hidnplayr | 767 | jb .err2 |
1482 | hidnplayr | 768 | |
1529 | hidnplayr | 769 | push esi ecx |
2305 | hidnplayr | 770 | mov eax, [esi + IPv4_header.DestinationAddress] |
1529 | hidnplayr | 771 | call ARP_IP_to_MAC |
772 | pop ecx esi |
||
773 | cmp eax, -1 |
||
774 | jz .err2 |
||
1482 | hidnplayr | 775 | |
1529 | hidnplayr | 776 | push ebx |
777 | push ax |
||
1482 | hidnplayr | 778 | |
1529 | hidnplayr | 779 | mov ebx, [NET_DRV_LIST] |
780 | lea eax, [ebx + ETH_DEVICE.mac] |
||
781 | push eax |
||
1482 | hidnplayr | 782 | |
783 | |||
2301 | hidnplayr | 784 | push esi ; ptr to ip header |
2305 | hidnplayr | 785 | sub ecx, sizeof.IPv4_header ; substract header size |
2301 | hidnplayr | 786 | push ecx ; max data size |
787 | push dword 0 ; offset |
||
1482 | hidnplayr | 788 | |
1529 | hidnplayr | 789 | .new_fragment: |
790 | DEBUGF 1,"Ipv4_fragment - new_fragmentn" |
||
1482 | hidnplayr | 791 | |
792 | |||
1529 | hidnplayr | 793 | mov eax, [esp + 3*4] |
794 | lea ebx, [esp + 4*4] |
||
795 | mov di , ETHER_IPv4 |
||
796 | call ETH_output |
||
1482 | hidnplayr | 797 | |
1529 | hidnplayr | 798 | cmp edi, -1 |
799 | jz .err |
||
1482 | hidnplayr | 800 | |
1529 | hidnplayr | 801 | ; copy header |
802 | mov esi, [esp + 2*4] |
||
803 | mov ecx, 5 ; 5 dwords: TODO: use IHL field of the header! |
||
804 | rep movsd |
||
1482 | hidnplayr | 805 | |
1529 | hidnplayr | 806 | ; copy data |
807 | mov esi, [esp + 2*4] |
||
2305 | hidnplayr | 808 | add esi, sizeof.IPv4_header |
1529 | hidnplayr | 809 | add esi, [esp] ; offset |
1482 | hidnplayr | 810 | |
1529 | hidnplayr | 811 | mov ecx, [esp + 1*4] |
812 | DEBUGF 1,"IPv4_fragment - copying data (%u bytes)\n", ecx |
||
813 | rep movsb |
||
1482 | hidnplayr | 814 | |
1529 | hidnplayr | 815 | ; now, correct header |
816 | mov ecx, [esp + 1*4] |
||
2305 | hidnplayr | 817 | add ecx, sizeof.IPv4_header |
1529 | hidnplayr | 818 | xchg cl, ch |
2305 | hidnplayr | 819 | mov [edi + IPv4_header.TotalLength], cx |
1482 | hidnplayr | 820 | |
1529 | hidnplayr | 821 | mov ecx, [esp] ; offset |
822 | xchg cl, ch |
||
1482 | hidnplayr | 823 | |
1529 | hidnplayr | 824 | ; cmp dword[esp + 4*4], 0 ; last fragment?;<<<<<< |
825 | ; je .last_fragment |
||
826 | or cx, 1 shl 2 ; more fragments |
||
827 | ; .last_fragment: |
||
2305 | hidnplayr | 828 | mov [edi + IPv4_header.FlagsAndFragmentOffset], cx |
1482 | hidnplayr | 829 | |
2305 | hidnplayr | 830 | mov [edi + IPv4_header.HeaderChecksum], 0 |
1482 | hidnplayr | 831 | |
1529 | hidnplayr | 832 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< send the packet |
833 | mov ecx, [esp + 1*4] |
||
1482 | hidnplayr | 834 | |
1529 | hidnplayr | 835 | push edx eax |
836 | IPv4_checksum edi |
||
837 | |||
838 | call [ebx + NET_DEVICE.transmit] |
||
839 | ;<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
||
840 | |||
841 | mov ecx, [esp+4] |
||
842 | add [esp], ecx |
||
843 | |||
844 | mov ecx, [esp+3*4+6+4] ; ptr to begin of buff |
||
845 | add ecx, [esp+3*4+6+4+4] ; buff size |
||
846 | sub ecx, [esp+2*4] ; ptr to ip header |
||
847 | add ecx, [esp] ; offset |
||
848 | |||
849 | DEBUGF 1,"Ipv4_fragment - bytes remaining: %u\n", ecx |
||
850 | |||
851 | cmp ecx, [esp+1*4] |
||
2300 | hidnplayr | 852 | jae .new_fragment |
1529 | hidnplayr | 853 | |
854 | mov [esp+4], ecx ; set fragment size to remaining packet size |
||
855 | jmp .new_fragment |
||
856 | |||
857 | .err: |
||
858 | DEBUGF 1,"Ipv4_fragment - failed\n" |
||
859 | .done: |
||
860 | add esp, 12 + 4 + 6 |
||
861 | .err2: |
||
862 | DEBUGF 1,"Ipv4_fragment - dumping\n" |
||
863 | call kernel_free |
||
864 | add esp, 4 |
||
865 | |||
866 | ret |
||
867 | |||
868 | |||
869 | |||
1159 | hidnplayr | 870 | ;--------------------------------------------------------------------------- |
871 | ; |
||
872 | ; IPv4_dest_to_dev |
||
873 | ; |
||
1529 | hidnplayr | 874 | ; IN: eax = Destination IP |
875 | ; OUT: edi = device id * 4 |
||
1159 | hidnplayr | 876 | ; |
877 | ;--------------------------------------------------------------------------- |
||
878 | align 4 |
||
879 | IPv4_dest_to_dev: |
||
880 | |||
1529 | hidnplayr | 881 | cmp eax, 0xffffffff |
882 | je .invalid |
||
1159 | hidnplayr | 883 | |
884 | xor edi, edi |
||
885 | mov ecx, MAX_IP |
||
886 | |||
887 | .loop: |
||
1529 | hidnplayr | 888 | mov ebx, [IP_LIST+edi] |
889 | and ebx, [SUBNET_LIST+edi] |
||
890 | jz .next |
||
891 | |||
1159 | hidnplayr | 892 | mov edx, eax |
893 | and edx, [SUBNET_LIST+edi] |
||
894 | |||
895 | cmp ebx, edx |
||
896 | je .found_it |
||
1529 | hidnplayr | 897 | .next: |
1159 | hidnplayr | 898 | add edi, 4 |
899 | loop .loop |
||
900 | |||
1529 | hidnplayr | 901 | .invalid: |
902 | xor edi, edi ; if none found, use device 0 as default device |
||
1159 | hidnplayr | 903 | |
904 | .found_it: |
||
1529 | hidnplayr | 905 | DEBUGF 1,"IPv4_dest_to_dev: %u\n", edi |
1159 | hidnplayr | 906 | |
907 | ret |
||
908 | |||
909 | |||
910 | |||
911 | ;--------------------------------------------------------------------------- |
||
912 | ; |
||
913 | ; IPv4_get_frgmnt_num |
||
914 | ; |
||
915 | ; IN: / |
||
916 | ; OUT: fragment number in ax |
||
917 | ; |
||
918 | ;--------------------------------------------------------------------------- |
||
919 | align 4 |
||
920 | IPv4_get_frgmnt_num: |
||
921 | xor ax, ax ;;; TODO: replace this with real code |
||
922 | |||
923 | ret |
||
924 | |||
925 | |||
926 | ;--------------------------------------------------------------------------- |
||
927 | ; |
||
928 | ; IPv4_API |
||
929 | ; |
||
930 | ; This function is called by system function 75 |
||
931 | ; |
||
932 | ; IN: subfunction number in bl |
||
933 | ; device number in bh |
||
934 | ; ecx, edx, .. depends on subfunction |
||
935 | ; |
||
936 | ; OUT: |
||
937 | ; |
||
938 | ;--------------------------------------------------------------------------- |
||
939 | align 4 |
||
940 | IPv4_API: |
||
941 | |||
942 | movzx eax, bh |
||
943 | shl eax, 2 |
||
944 | |||
945 | test bl, bl |
||
946 | jz .packets_tx ; 0 |
||
947 | dec bl |
||
948 | jz .packets_rx ; 1 |
||
949 | dec bl |
||
950 | jz .read_ip ; 2 |
||
951 | dec bl |
||
952 | jz .write_ip ; 3 |
||
953 | dec bl |
||
954 | jz .read_dns ; 4 |
||
955 | dec bl |
||
956 | jz .write_dns ; 5 |
||
957 | dec bl |
||
958 | jz .read_subnet ; 6 |
||
959 | dec bl |
||
960 | jz .write_subnet ; 7 |
||
961 | dec bl |
||
962 | jz .read_gateway ; 8 |
||
963 | dec bl |
||
964 | jz .write_gateway ; 9 |
||
965 | |||
1473 | hidnplayr | 966 | .error: |
1159 | hidnplayr | 967 | mov eax, -1 |
968 | ret |
||
969 | |||
1473 | hidnplayr | 970 | .packets_tx: |
1159 | hidnplayr | 971 | add eax, IP_PACKETS_TX |
972 | mov eax, [eax] |
||
973 | ret |
||
974 | |||
1473 | hidnplayr | 975 | .packets_rx: |
1159 | hidnplayr | 976 | add eax, IP_PACKETS_RX |
977 | mov eax, [eax] |
||
978 | ret |
||
979 | |||
1473 | hidnplayr | 980 | .read_ip: |
1159 | hidnplayr | 981 | add eax, IP_LIST |
982 | mov eax, [eax] |
||
983 | ret |
||
984 | |||
1473 | hidnplayr | 985 | .write_ip: |
1159 | hidnplayr | 986 | add eax, IP_LIST |
987 | mov [eax], ecx |
||
988 | xor eax, eax |
||
989 | ret |
||
990 | |||
1473 | hidnplayr | 991 | .read_dns: |
1159 | hidnplayr | 992 | add eax, DNS_LIST |
993 | mov eax, [eax] |
||
994 | ret |
||
995 | |||
1473 | hidnplayr | 996 | .write_dns: |
1159 | hidnplayr | 997 | add eax, DNS_LIST |
998 | mov [eax], ecx |
||
999 | xor eax, eax |
||
1000 | ret |
||
1001 | |||
1473 | hidnplayr | 1002 | .read_subnet: |
1159 | hidnplayr | 1003 | add eax, SUBNET_LIST |
1004 | mov eax, [eax] |
||
1005 | ret |
||
1006 | |||
1473 | hidnplayr | 1007 | .write_subnet: |
1159 | hidnplayr | 1008 | add eax, SUBNET_LIST |
1009 | mov [eax], ecx |
||
1010 | xor eax, eax |
||
1011 | ret |
||
1012 | |||
1473 | hidnplayr | 1013 | .read_gateway: |
1159 | hidnplayr | 1014 | add eax, GATEWAY_LIST |
1015 | mov eax, [eax] |
||
1016 | ret |
||
1017 | |||
1473 | hidnplayr | 1018 | .write_gateway: |
1159 | hidnplayr | 1019 | add eax, GATEWAY_LIST |
1020 | mov [eax], ecx |
||
1021 | xor eax, eax |
||
1529 | hidnplayr | 1022 | ret |