WebSVN – Kolibri OS – Blame – /kernel/trunk/network/IPv4.inc

Rev	Author	Line No.	Line
3545	hidnplayr	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
9800	Boppan	3	;; Copyright (C) KolibriOS team 2004-2022. All rights reserved. ;;
3545	hidnplayr	4	;; Distributed under terms of the GNU General Public License ;;
		5	;; ;;
		6	;; IPv4.INC ;;
		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
4850	mario79	19	$Revision: 9802 $
3545	hidnplayr	20
4053	hidnplayr	21	IPv4_MAX_FRAGMENTS = 64
4387	hidnplayr	22	IPv4_MAX_ROUTES = 64
3545	hidnplayr	23
4387	hidnplayr	24	IPv4_ROUTE_FLAG_UP = 1 shl 0
		25	IPv4_ROUTE_FLAG_GATEWAY = 1 shl 1
		26	IPv4_ROUTE_FLAG_HOST = 1 shl 2
		27	IPv4_ROUTE_FLAG_D = 1 shl 3 ; Route was created by a redirect
		28	IPv4_ROUTE_FLAG_M = 1 shl 4 ; Route was modified by a redirect
		29
3545	hidnplayr	30	struct IPv4_header
		31
		32	VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits]
		33	TypeOfService db ? ; precedence [7-5] minimize delay [4], maximize throughput [3], maximize riliability [2] minimize momentary cost [1] and zero [0]
		34	TotalLength dw ?
		35	Identification dw ?
		36	FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15]
		37	TimeToLive db ? ;
		38	Protocol db ?
		39	HeaderChecksum dw ?
		40	SourceAddress dd ?
		41	DestinationAddress dd ?
		42
		43	ends
		44
4052	hidnplayr	45	struct IPv4_FRAGMENT_slot
3545	hidnplayr	46
		47	ttl dw ? ; Time to live for this entry, 0 for empty slot's
		48	id dw ? ; Identification field from IP header
		49	SrcIP dd ? ; .. from IP header
		50	DstIP dd ? ; .. from IP header
		51	ptr dd ? ; Pointer to first packet
		52
		53	ends
		54
4052	hidnplayr	55	struct IPv4_FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets
3545	hidnplayr	56
		57	PrevPtr dd ? ; Pointer to previous fragment entry (-1 for first packet)
		58	NextPtr dd ? ; Pointer to next fragment entry (-1 for last packet)
		59	Owner dd ? ; Pointer to structure of driver
		60	rb 2 ; to match ethernet header size ;;; FIXME
		61	; Ip header begins here (we will need the IP header to re-construct the complete packet)
		62	ends
		63
7678	hidnplayr	64	;struct IPv4_ROUTE
		65	;
		66	; Destination dd ?
		67	; Gateway dd ?
		68	; Flags dd ?
		69	; Use dd ?
		70	; Interface dd ?
		71	;
		72	;ends
3545	hidnplayr	73
3698	hidnplayr	74	uglobal
3545	hidnplayr	75	align 4
		76
7678	hidnplayr	77	IPv4_address rd NET_DEVICES_MAX
		78	IPv4_subnet rd NET_DEVICES_MAX
		79	IPv4_nameserver rd NET_DEVICES_MAX
		80	IPv4_gateway rd NET_DEVICES_MAX
		81	IPv4_broadcast rd NET_DEVICES_MAX
3545	hidnplayr	82
4052	hidnplayr	83	IPv4_packets_tx rd NET_DEVICES_MAX
		84	IPv4_packets_rx rd NET_DEVICES_MAX
		85	IPv4_packets_dumped rd NET_DEVICES_MAX
3545	hidnplayr	86
7678	hidnplayr	87	IPv4_fragments rb IPv4_MAX_FRAGMENTS * sizeof.IPv4_FRAGMENT_slot
3698	hidnplayr	88
7678	hidnplayr	89	; IPv4_routes rd IPv4_MAX_ROUTES * sizeof.IPv4_ROUTE
9801	Boppan	90	edi_saved rd 1
4387	hidnplayr	91
3545	hidnplayr	92	endg
		93
		94
6011	hidnplayr	95	;-----------------------------------------------------------------;
		96	; ;
		97	; ipv4_init: Resets all IPv4 variables ;
		98	; ;
		99	;-----------------------------------------------------------------;
		100	macro ipv4_init {
3545	hidnplayr	101
		102	xor eax, eax
7678	hidnplayr	103	mov edi, IPv4_address
4052	hidnplayr	104	mov ecx, 7NET_DEVICES_MAX + (sizeof.IPv4_FRAGMENT_slotIPv4_MAX_FRAGMENTS)/4
3711	clevermous	105	rep stosd
3545	hidnplayr	106
		107	}
		108
		109
6011	hidnplayr	110	;-----------------------------------------------------------------;
		111	; ;
		112	; Decrease TimeToLive of all fragment slots ;
		113	; ;
		114	;-----------------------------------------------------------------;
		115	macro ipv4_decrease_fragment_ttls {
3545	hidnplayr	116
		117	local .loop, .next
		118
7678	hidnplayr	119	mov esi, IPv4_fragments
4052	hidnplayr	120	mov ecx, IPv4_MAX_FRAGMENTS
3545	hidnplayr	121	.loop:
4052	hidnplayr	122	cmp [esi + IPv4_FRAGMENT_slot.ttl], 0
3545	hidnplayr	123	je .next
4052	hidnplayr	124	dec [esi + IPv4_FRAGMENT_slot.ttl]
3545	hidnplayr	125	jz .died
		126	.next:
4052	hidnplayr	127	add esi, sizeof.IPv4_FRAGMENT_slot
3545	hidnplayr	128	dec ecx
		129	jnz .loop
		130	jmp .done
		131
		132	.died:
3556	hidnplayr	133	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4 Fragment slot timed-out!\n"
3545	hidnplayr	134	;;; TODO: clear all entry's of timed-out slot
		135	jmp .next
		136
		137	.done:
		138	}
		139
		140
		141
6011	hidnplayr	142	macro ipv4_checksum ptr {
3545	hidnplayr	143
		144	; This is the fast procedure to create or check an IP header without options
		145	; To create a new checksum, the checksum field must be set to 0 before computation
		146	; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct
		147
		148	push ebx
		149	xor ebx, ebx
		150	add bl, [ptr+1]
		151	adc bh, [ptr+0]
		152
		153	adc bl, [ptr+3]
		154	adc bh, [ptr+2]
		155
		156	adc bl, [ptr+5]
		157	adc bh, [ptr+4]
		158
		159	adc bl, [ptr+7]
		160	adc bh, [ptr+6]
		161
		162	adc bl, [ptr+9]
		163	adc bh, [ptr+8]
		164
		165	; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation
		166
		167	adc bl, [ptr+13]
		168	adc bh, [ptr+12]
		169
		170	adc bl, [ptr+15]
		171	adc bh, [ptr+14]
		172
		173	adc bl, [ptr+17]
		174	adc bh, [ptr+16]
		175
		176	adc bl, [ptr+19]
		177	adc bh, [ptr+18]
		178
		179	adc ebx, 0
		180
		181	push ecx
		182	mov ecx, ebx
		183	shr ecx, 16
		184	and ebx, 0xffff
		185	add ebx, ecx
		186
		187	mov ecx, ebx
		188	shr ecx, 16
		189	add ebx, ecx
		190
		191	not bx
		192	jnz .not_zero
		193	dec bx
		194	.not_zero:
		195	xchg bl, bh
		196	pop ecx
		197
		198	neg word [ptr+10] ; zero will stay zero so we just get the checksum
		199	add word [ptr+10], bx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :)
		200	pop ebx
		201
		202	}
		203
		204
		205
6011	hidnplayr	206	;-----------------------------------------------------------------;
		207	; ;
		208	; ipv4_input: Check if IPv4 Packet isnt damaged and call ;
		209	; appropriate handler. (TCP/UDP/ICMP/..) ;
		210	; We will also re-construct fragmented packets. ;
		211	; ;
		212	; IN: Pointer to buffer in [esp] ;
		213	; pointer to device struct in ebx ;
		214	; pointer to IPv4 header in edx ;
		215	; size of IPv4 packet in ecx ;
		216	; ;
		217	; OUT: / ;
		218	; ;
		219	;-----------------------------------------------------------------;
3545	hidnplayr	220	align 4
6011	hidnplayr	221	ipv4_input:
3545	hidnplayr	222
6908	ashmew2	223	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: packet from %u.%u.%u.%u ",\
3545	hidnplayr	224	[edx + IPv4_header.SourceAddress + 0]:1,[edx + IPv4_header.SourceAddress + 1]:1,\
		225	[edx + IPv4_header.SourceAddress + 2]:1,[edx + IPv4_header.SourceAddress + 3]:1
5522	hidnplayr	226	DEBUGF DEBUG_NETWORK_VERBOSE, "to %u.%u.%u.%u\n",\
3545	hidnplayr	227	[edx + IPv4_header.DestinationAddress + 0]:1,[edx + IPv4_header.DestinationAddress + 1]:1,\
		228	[edx + IPv4_header.DestinationAddress + 2]:1,[edx + IPv4_header.DestinationAddress + 3]:1
		229
6011	hidnplayr	230	call net_ptr_to_num4
5842	hidnplayr	231	cmp edi, -1
		232	je .invalid_device
		233
3545	hidnplayr	234	;-------------------------------
		235	; re-calculate the checksum
		236
6011	hidnplayr	237	ipv4_checksum edx
3545	hidnplayr	238	jnz .dump ; if checksum isn't valid then dump packet
		239
3556	hidnplayr	240	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Checksum ok\n"
3545	hidnplayr	241
5842	hidnplayr	242	;--------------------------------
		243	; Check if destination IP matches
3545	hidnplayr	244
5842	hidnplayr	245	; local ip (Using RFC1122 strong end system model)
3545	hidnplayr	246	mov eax, [edx + IPv4_header.DestinationAddress]
7678	hidnplayr	247	cmp eax, [IPv4_address + edi]
3545	hidnplayr	248	je .ip_ok
		249
5842	hidnplayr	250	; network layer broadcast
7678	hidnplayr	251	cmp eax, [IPv4_broadcast + edi]
3545	hidnplayr	252	je .ip_ok
		253
5842	hidnplayr	254	; physical layer broadcast (255.255.255.255)
3545	hidnplayr	255	cmp eax, 0xffffffff
		256	je .ip_ok
		257
5842	hidnplayr	258	; multicast (224.0.0.0/4 = 224.0.0.0 to 239.255.255.255)
3545	hidnplayr	259	and eax, 0x0fffffff
		260	cmp eax, 224
		261	je .ip_ok
		262
5842	hidnplayr	263	; maybe we just dont have an IP yet and should accept everything on the IP level
7678	hidnplayr	264	cmp [IPv4_address + edi], 0
3545	hidnplayr	265	je .ip_ok
		266
5842	hidnplayr	267	; or it's just not meant for us.. :(
3556	hidnplayr	268	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Destination address does not match!\n"
3545	hidnplayr	269	jmp .dump
		270
		271	;------------------------
		272	; Now we can update stats
		273
		274	.ip_ok:
4052	hidnplayr	275	inc [IPv4_packets_rx + edi]
3545	hidnplayr	276
		277	;----------------------------------
		278	; Check if the packet is fragmented
		279
		280	test [edx + IPv4_header.FlagsAndFragmentOffset], 1 shl 5 ; Is 'more fragments' flag set ?
		281	jnz .has_fragments ; If so, we definately have a fragmented packet
		282
		283	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
		284	jnz .is_last_fragment
		285
		286	;-------------------------------------------------------------------
		287	; No, it's just a regular IP packet, pass it to the higher protocols
		288
		289	.handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed
		290
		291	movzx esi, [edx + IPv4_header.VersionAndIHL] ; Calculate Header length by using IHL field
		292	and esi, 0x0000000f ;
		293	shl esi, 2 ;
		294
		295	movzx ecx, [edx + IPv4_header.TotalLength] ; Calculate length of encapsulated Packet
		296	xchg cl, ch ;
		297	sub ecx, esi ;
		298
		299	mov al, [edx + IPv4_header.Protocol]
		300	add esi, edx ; make esi ptr to data
		301
		302	cmp al, IP_PROTO_TCP
6011	hidnplayr	303	je tcp_input
3545	hidnplayr	304
		305	cmp al, IP_PROTO_UDP
6011	hidnplayr	306	je udp_input
3545	hidnplayr	307
		308	cmp al, IP_PROTO_ICMP
6011	hidnplayr	309	je icmp_input
3545	hidnplayr	310
5842	hidnplayr	311	;-------------------------------
		312	; Look for a matching RAW socket
		313	pusha
		314	mov ecx, socket_mutex
		315	call mutex_lock
		316	popa
		317
		318	add ecx, esi
		319	sub ecx, edx
		320	mov esi, edx
		321	movzx edx, al
		322	mov eax, net_sockets
		323	.next_socket:
		324	mov eax, [eax + SOCKET.NextPtr]
		325	or eax, eax
		326	jz .dump_unlock
		327
		328	cmp [eax + SOCKET.Domain], AF_INET4
		329	jne .next_socket
		330
		331	cmp [eax + SOCKET.Protocol], edx
		332	jne .next_socket
		333
		334	pusha
		335	mov ecx, socket_mutex
		336	call mutex_unlock
		337	popa
		338
		339	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: found matching RAW socket: 0x%x\n", eax
		340
		341	pusha
		342	lea ecx, [eax + SOCKET.mutex]
		343	call mutex_lock
		344	popa
		345
6011	hidnplayr	346	jmp socket_input
5842	hidnplayr	347
		348	.dump_unlock:
		349
		350	pusha
		351	mov ecx, socket_mutex
		352	call mutex_unlock
		353	popa
		354
3556	hidnplayr	355	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: unknown protocol %u\n", al
3545	hidnplayr	356
		357	.dump:
3556	hidnplayr	358	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: dumping\n"
5842	hidnplayr	359	inc [IPv4_packets_dumped + edi]
6011	hidnplayr	360	call net_buff_free
3545	hidnplayr	361	ret
		362
5842	hidnplayr	363	.invalid_device:
		364	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_input: packet originated from invalid device\n"
6011	hidnplayr	365	call net_buff_free
5842	hidnplayr	366	ret
3545	hidnplayr	367
5842	hidnplayr	368
3545	hidnplayr	369	;---------------------------
		370	; Fragmented packet handler
		371
		372
		373	.has_fragments:
		374	movzx eax, [edx + IPv4_header.FlagsAndFragmentOffset]
		375	xchg al, ah
		376	shl ax, 3
		377
4258	hidnplayr	378	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: fragmented packet offset=%u id=%x ptr=0x%x\n", ax, [edx + IPv4_header.Identification]:4, edx
3545	hidnplayr	379
		380	test ax, ax ; Is this the first packet of the fragment?
		381	jz .is_first_fragment
		382
		383
		384	;-------------------------------------------------------
		385	; We have a fragmented IP packet, but it's not the first
		386
3556	hidnplayr	387	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Middle fragment packet received!\n"
3545	hidnplayr	388
6011	hidnplayr	389	call ipv4_find_fragment_slot
3545	hidnplayr	390	cmp esi, -1
		391	je .dump
		392
4052	hidnplayr	393	mov [esi + IPv4_FRAGMENT_slot.ttl], 15 ; Reset the ttl
		394	mov esi, [esi + IPv4_FRAGMENT_slot.ptr]
3545	hidnplayr	395	or edi, -1
		396	.find_last_entry: ; The following routine will try to find the last entry
9799	Boppan	397	cmp edi, [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.PrevPtr]
3545	hidnplayr	398	jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!)
		399	mov edi, esi
9799	Boppan	400	mov esi, [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr]
3545	hidnplayr	401	cmp esi, -1
		402	jne .find_last_entry
		403	; We found the last entry (pointer is now in edi)
		404	; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure
		405
		406	pop eax ; pointer to packet
9799	Boppan	407	mov [edi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry
		408	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr], -1
		409	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.PrevPtr], edi
		410	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.Owner], ebx
3545	hidnplayr	411
		412	ret
		413
		414
		415	;------------------------------------
		416	; We have received the first fragment
		417
		418	.is_first_fragment:
3556	hidnplayr	419	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: First fragment packet received!\n"
3545	hidnplayr	420	; try to locate a free slot..
4052	hidnplayr	421	mov ecx, IPv4_MAX_FRAGMENTS
7678	hidnplayr	422	mov esi, IPv4_fragments
3545	hidnplayr	423	.find_free_slot:
4052	hidnplayr	424	cmp word [esi + IPv4_FRAGMENT_slot.ttl], 0
3545	hidnplayr	425	je .found_free_slot
4052	hidnplayr	426	add esi, sizeof.IPv4_FRAGMENT_slot
3545	hidnplayr	427	loop .find_free_slot
		428	jmp .dump ; If no free slot was found, dump the packet
		429
		430	.found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure
4052	hidnplayr	431	mov [esi + IPv4_FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl
3545	hidnplayr	432	mov ax, [edx + IPv4_header.Identification]
4052	hidnplayr	433	mov [esi + IPv4_FRAGMENT_slot.id], ax
3545	hidnplayr	434	mov eax, [edx + IPv4_header.SourceAddress]
4052	hidnplayr	435	mov [esi + IPv4_FRAGMENT_slot.SrcIP], eax
3545	hidnplayr	436	mov eax, [edx + IPv4_header.DestinationAddress]
4052	hidnplayr	437	mov [esi + IPv4_FRAGMENT_slot.DstIP], eax
3545	hidnplayr	438	pop eax
4052	hidnplayr	439	mov [esi + IPv4_FRAGMENT_slot.ptr], eax
3545	hidnplayr	440	; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure
9799	Boppan	441	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr], -1
		442	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.PrevPtr], -1
		443	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.Owner], ebx
3545	hidnplayr	444
		445	ret
		446
		447
		448	;-----------------------------------
		449	; We have received the last fragment
		450
		451	.is_last_fragment:
3556	hidnplayr	452	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Last fragment packet received!\n"
3545	hidnplayr	453
6011	hidnplayr	454	call ipv4_find_fragment_slot
3545	hidnplayr	455	cmp esi, -1
		456	je .dump
		457
4052	hidnplayr	458	mov esi, [esi + IPv4_FRAGMENT_slot.ptr] ; We found the first entry, let's calculate total size of the packet in eax, so we can allocate a buffer
3545	hidnplayr	459	push esi
		460	xor eax, eax
9801	Boppan	461	mov [edi_saved], edi
3545	hidnplayr	462	or edi, -1
		463
		464	.count_bytes:
9799	Boppan	465	cmp [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.PrevPtr], edi
4052	hidnplayr	466	jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!)
9799	Boppan	467	mov cx, [esi + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Add total length
3545	hidnplayr	468	xchg cl, ch
3556	hidnplayr	469	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet size=%u\n", cx
3545	hidnplayr	470	add ax, cx
9799	Boppan	471	movzx cx, [esi + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Sub Header length
3545	hidnplayr	472	and cx, 0x000F
		473	shl cx, 2
3556	hidnplayr	474	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Header size=%u\n", cx
3545	hidnplayr	475	sub ax, cx
		476	mov edi, esi
9799	Boppan	477	mov esi, [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr]
3545	hidnplayr	478	cmp esi, -1
		479	jne .count_bytes
		480
		481	mov esi, [esp+4]
9799	Boppan	482	mov [edi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code
		483	mov [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr], -1
		484	mov [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.PrevPtr], edi
		485	mov [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.Owner], ebx
3545	hidnplayr	486
4052	hidnplayr	487	mov cx, [edx + IPv4_header.TotalLength] ; Note: This time we dont substract Header length
3545	hidnplayr	488	xchg cl, ch
3556	hidnplayr	489	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet size=%u\n", cx
3545	hidnplayr	490	add ax, cx
3556	hidnplayr	491	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Total Received data size=%u\n", eax
3545	hidnplayr	492
		493	push eax
		494	mov ax, [edx + IPv4_header.FlagsAndFragmentOffset]
9736	Boppan	495	xchg al, ah
9729	Boppan	496	shl ax, 3
3545	hidnplayr	497	add cx, ax
		498	pop eax
3556	hidnplayr	499	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Total Fragment size=%u\n", ecx
3545	hidnplayr	500
		501	cmp ax, cx
		502	jne .destroy_slot_pop
		503
		504	push eax
		505	push eax
		506	call kernel_alloc
		507	test eax, eax
		508	je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot
		509	mov edx, [esp+4] ; Get pointer to first fragment entry back in edx
		510
		511	.rebuild_packet_loop:
9799	Boppan	512	movzx ecx, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.FlagsAndFragmentOffset] ; Calculate the fragment offset
3545	hidnplayr	513	xchg cl, ch ; intel byte order
		514	shl cx, 3 ; multiply by 8 and clear first 3 bits
3556	hidnplayr	515	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Fragment offset=%u\n", cx
3545	hidnplayr	516
		517	lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment
9799	Boppan	518	movzx ebx, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment
3545	hidnplayr	519	and bx, 0x000F ;
		520	shl bx, 2 ;
		521
9799	Boppan	522	lea esi, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry] ; Set esi to the correct begin of fragment
		523	movzx ecx, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment
3545	hidnplayr	524	xchg cl, ch ; intel byte order
		525
		526	cmp edi, eax ; Is this packet the first fragment ?
		527	je .first_fragment
		528	sub cx, bx ; If not, dont copy the header
		529	add esi, ebx ;
		530	.first_fragment:
		531
4258	hidnplayr	532
		533	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Copying %u bytes from 0x%x to 0x%x\n", ecx, esi, edi
3545	hidnplayr	534	push cx ; First copy dword-wise, then byte-wise
		535	shr cx, 2 ;
3711	clevermous	536	rep movsd ;
3545	hidnplayr	537	pop cx ;
		538	and cx, 3 ;
3711	clevermous	539	rep movsb ;
3545	hidnplayr	540
		541	push eax
9799	Boppan	542	push [edx + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet
		543	push [edx + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr] ; Set edx to the next pointer
3545	hidnplayr	544	push edx ; Push pointer to fragment onto stack
4258	hidnplayr	545	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Next Fragment: 0x%x\n", edx
6011	hidnplayr	546	call net_buff_free ; free the previous fragment buffer (this uses the value from stack)
4258	hidnplayr	547	pop edx ebx eax
3545	hidnplayr	548	cmp edx, -1 ; Check if it is last fragment in chain
		549	jne .rebuild_packet_loop
		550
		551	pop ecx
		552	xchg cl, ch
		553	mov edx, eax
		554	mov [edx + IPv4_header.TotalLength], cx
4259	hidnplayr	555	add esp, 12
3545	hidnplayr	556	xchg cl, ch
9802	Boppan	557	inc ecx ; FIXME: Why it has to be incremented?
4259	hidnplayr	558	push ecx edx ; size and pointer
9801	Boppan	559	mov edi, [edi_saved]
4259	hidnplayr	560	jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr
3545	hidnplayr	561
		562	.destroy_slot_pop:
		563	add esp, 4
		564	.destroy_slot:
3556	hidnplayr	565	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Destroy fragment slot!\n"
3545	hidnplayr	566	; TODO!
		567	jmp .dump
		568
		569
		570
		571
		572
6011	hidnplayr	573	;-----------------------------------------------------------------;
		574	; ;
		575	; ipv4_find_fragment_slot ;
		576	; ;
		577	; IN: pointer to fragmented packet in edx ;
		578	; ;
		579	; OUT: pointer to slot in esi, -1 on error ;
		580	; ;
		581	;-----------------------------------------------------------------;
3545	hidnplayr	582	align 4
6011	hidnplayr	583	ipv4_find_fragment_slot:
3545	hidnplayr	584
		585	;;; TODO: the RFC says we should check protocol number too
		586
		587	push eax ebx ecx edx
		588	mov ax, [edx + IPv4_header.Identification]
4052	hidnplayr	589	mov ecx, IPv4_MAX_FRAGMENTS
7678	hidnplayr	590	mov esi, IPv4_fragments
3545	hidnplayr	591	mov ebx, [edx + IPv4_header.SourceAddress]
		592	mov edx, [edx + IPv4_header.DestinationAddress]
		593	.find_slot:
4052	hidnplayr	594	cmp [esi + IPv4_FRAGMENT_slot.id], ax
3545	hidnplayr	595	jne .try_next
4052	hidnplayr	596	cmp [esi + IPv4_FRAGMENT_slot.SrcIP], ebx
3545	hidnplayr	597	jne .try_next
4052	hidnplayr	598	cmp [esi + IPv4_FRAGMENT_slot.DstIP], edx
3545	hidnplayr	599	je .found_slot
		600	.try_next:
4052	hidnplayr	601	add esi, sizeof.IPv4_FRAGMENT_slot
3545	hidnplayr	602	loop .find_slot
		603
		604	or esi, -1
		605	.found_slot:
		606	pop edx ecx ebx eax
		607	ret
		608
		609
6011	hidnplayr	610	;------------------------------------------------------------------;
		611	; ;
		612	; ipv4_output ;
		613	; ;
		614	; IN: al = protocol ;
		615	; ah = TTL ;
		616	; ebx = device ptr (or 0 to let IP layer decide) ;
		617	; ecx = data length ;
		618	; edx = Source IP ;
		619	; edi = Destination IP ;
		620	; ;
		621	; OUT: eax = pointer to buffer start ;
		622	; eax = 0 on error ;
		623	; ebx = device ptr (send packet through this device) ;
		624	; ecx = data length ;
		625	; edx = size of complete frame ;
		626	; edi = start of IPv4 payload ;
		627	; ;
		628	;------------------------------------------------------------------;
3545	hidnplayr	629	align 4
6011	hidnplayr	630	ipv4_output:
3545	hidnplayr	631
6475	hidnplayr	632	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: size=%u ip=0x%x\n", ecx, edi
3545	hidnplayr	633
		634	cmp ecx, 65500 ; Max IPv4 packet size
		635	ja .too_large
		636
5842	hidnplayr	637	push ecx ax edi
		638	mov eax, edi
6011	hidnplayr	639	call ipv4_route ; outputs device number in edi, dest ip in eax, source IP in edx
6122	hidnplayr	640	test eax, eax
		641	jz .no_route
4052	hidnplayr	642	push edx
3610	hidnplayr	643	test edi, edi
		644	jz .loopback
		645
6011	hidnplayr	646	call arp_ip_to_mac
3545	hidnplayr	647	test eax, 0xffff0000 ; error bits
		648	jnz .arp_error
		649	push ebx ; push the mac onto the stack
		650	push ax
		651
5842	hidnplayr	652	inc [IPv4_packets_tx + edi] ; update stats
3545	hidnplayr	653
5015	hidnplayr	654	mov ax, ETHER_PROTO_IPv4
7679	hidnplayr	655	mov ebx, [net_device_list + edi]
4052	hidnplayr	656	mov ecx, [esp + 6 + 8 + 2]
3545	hidnplayr	657	add ecx, sizeof.IPv4_header
5015	hidnplayr	658	mov edx, esp
6011	hidnplayr	659	call eth_output
3545	hidnplayr	660	jz .eth_error
		661	add esp, 6 ; pop the mac out of the stack
		662
		663	.continue:
		664	xchg cl, ch ; internet byte order
		665	mov [edi + IPv4_header.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header)
		666	mov [edi + IPv4_header.TypeOfService], 0 ; nothing special, just plain ip packet
		667	mov [edi + IPv4_header.TotalLength], cx
		668	mov [edi + IPv4_header.Identification], 0 ; fragment id: FIXME
		669	mov [edi + IPv4_header.FlagsAndFragmentOffset], 0
4052	hidnplayr	670
3545	hidnplayr	671	mov [edi + IPv4_header.HeaderChecksum], 0
		672	popd [edi + IPv4_header.SourceAddress]
		673	popd [edi + IPv4_header.DestinationAddress]
		674
4052	hidnplayr	675	pop word[edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol
		676	; [edi + IPv4_header.Protocol]
		677
3545	hidnplayr	678	pop ecx
		679
6011	hidnplayr	680	ipv4_checksum edi
3545	hidnplayr	681	add edi, sizeof.IPv4_header
3556	hidnplayr	682	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: success!\n"
3545	hidnplayr	683	ret
		684
		685	.eth_error:
3603	hidnplayr	686	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ethernet error\n"
3545	hidnplayr	687	add esp, 3*4+2+6
5015	hidnplayr	688	xor eax, eax
3545	hidnplayr	689	ret
		690
6122	hidnplayr	691	.no_route:
		692	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: No route to host!\n"
		693	add esp, 2*4+2
		694	xor eax, eax
		695	ret
		696
3545	hidnplayr	697	.arp_error:
3603	hidnplayr	698	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ARP error=%x\n", eax
5842	hidnplayr	699	add esp, 4
		700	pop eax
		701	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ip=0x%x\n", eax
		702	add esp, 4+2
5015	hidnplayr	703	xor eax, eax
3545	hidnplayr	704	ret
		705
		706	.too_large:
3556	hidnplayr	707	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: Packet too large!\n"
5015	hidnplayr	708	xor eax, eax
3545	hidnplayr	709	ret
		710
		711	.loopback:
7678	hidnplayr	712	inc [IPv4_packets_tx + edi] ; update stats
		713
5522	hidnplayr	714	mov dword [esp], eax ; set source IP to dest IP
3610	hidnplayr	715	mov ecx, [esp + 10]
3545	hidnplayr	716	add ecx, sizeof.IPv4_header
3600	hidnplayr	717	mov edi, AF_INET4
6011	hidnplayr	718	call loop_output
3545	hidnplayr	719	jmp .continue
		720
		721
		722
		723
6011	hidnplayr	724	;------------------------------------------------------------------;
		725	; ;
		726	; ipv4_output_raw ;
		727	; ;
		728	; IN: eax = socket ptr ;
		729	; ecx = data length ;
		730	; esi = data ptr ;
		731	; ;
		732	; OUT: eax = -1 on error ;
		733	; ;
		734	;------------------------------------------------------------------;
3545	hidnplayr	735	align 4
6011	hidnplayr	736	ipv4_output_raw:
3545	hidnplayr	737
		738	DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax
		739
		740	sub esp, 8
		741	push esi eax
		742
6011	hidnplayr	743	call ipv4_route
		744	call arp_ip_to_mac
3545	hidnplayr	745
		746	test eax, 0xffff0000 ; error bits
		747	jnz .arp_error
		748
		749	push ebx ; push the mac
		750	push ax
		751
4052	hidnplayr	752	inc [IPv4_packets_tx + 4*edi]
5015	hidnplayr	753	mov ax, ETHER_PROTO_IPv4
7679	hidnplayr	754	mov ebx, [net_device_list + 4*edi]
3545	hidnplayr	755	mov ecx, [esp + 6 + 4]
		756	add ecx, sizeof.IPv4_header
5015	hidnplayr	757	mov edx, esp
6011	hidnplayr	758	call eth_output
3545	hidnplayr	759	jz .error
		760	add esp, 6 ; pop the mac
		761
		762	mov dword[esp+4+4], edx
		763	mov dword[esp+4+4+4], eax
		764
		765	pop eax esi
5842	hidnplayr	766	;; TODO: check socket options if we should add header, or just compute checksum
3545	hidnplayr	767
		768	push edi ecx
3711	clevermous	769	rep movsb
3545	hidnplayr	770	pop ecx edi
		771
		772	; [edi + IPv4_header.VersionAndIHL] ; IPv4, normal length (no Optional header)
		773	; [edi + IPv4_header.TypeOfService] ; nothing special, just plain ip packet
		774	; [edi + IPv4_header.TotalLength]
		775	; [edi + IPv4_header.TotalLength] ; internet byte order
		776	; [edi + IPv4_header.FlagsAndFragmentOffset]
		777
		778	mov [edi + IPv4_header.HeaderChecksum], 0
		779
		780	; [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol
		781	; [edi + IPv4_header.Protocol]
		782	; [edi + IPv4_header.Identification] ; fragment id
		783	; [edi + IPv4_header.SourceAddress]
		784	; [edi + IPv4_header.DestinationAddress]
		785
6011	hidnplayr	786	ipv4_checksum edi ;;;; todo: checksum for IP packet with options!
3545	hidnplayr	787	add edi, sizeof.IPv4_header
3556	hidnplayr	788	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output_raw: device=%x\n", ebx
3545	hidnplayr	789	call [ebx + NET_DEVICE.transmit]
		790	ret
		791
		792	.error:
5842	hidnplayr	793	add esp, 6+8+4+4
		794	mov ebx, ENOBUFS ; FIXME: NOBUFS or MSGSIZE error
		795	or eax, -1
		796	ret
		797
3545	hidnplayr	798	.arp_error:
		799	add esp, 8+4+4
5842	hidnplayr	800	mov ebx, ENOTCONN
5015	hidnplayr	801	or eax, -1
3545	hidnplayr	802	ret
		803
		804
6011	hidnplayr	805	;-----------------------------------------------------------------;
		806	; ;
		807	; ipv4_fragment ;
		808	; ;
		809	; IN: [esp] = ptr to packet buffer to fragment ;
		810	; edi = ptrr to ip header in that buffer ;
		811	; ebx = device ptr ;
		812	; ;
		813	; OUT: / ;
		814	; ;
		815	;-----------------------------------------------------------------;
		816	proc ipv4_fragment stdcall buffer
3545	hidnplayr	817
5842	hidnplayr	818	locals
		819	offset dd ?
		820	headerlength dd ?
		821	headerptr dd ?
		822	dataptr dd ?
		823	remaining dd ?
		824	segmentsize dd ?
		825	endl
3545	hidnplayr	826
3556	hidnplayr	827	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_fragment\n"
3545	hidnplayr	828
5842	hidnplayr	829	; We must be able to put at least 8 bytes per segment
		830	movzx eax, byte[edi] ; IHL
		831	and eax, 0xf
		832	shl eax, 2
		833	mov [headerlength], eax
		834	add eax, 8
		835	mov ecx, [ebx + NET_DEVICE.mtu]
		836	and ecx, not 11b
		837	cmp ecx, eax
		838	jb .fail
3545	hidnplayr	839
5842	hidnplayr	840	mov [edi + IPv4_header.HeaderChecksum], 0
3545	hidnplayr	841
5842	hidnplayr	842	mov [segmentsize], ecx
		843	mov [headerptr], edi
		844	movzx ecx, [edi + IPv4_header.TotalLength]
		845	xchg cl, ch
		846	sub ecx, [headerlength]
		847	mov [remaining], ecx
		848	mov [offset], 0
3545	hidnplayr	849
5842	hidnplayr	850	add edi, [headerlength]
		851	mov [dataptr], edi
3545	hidnplayr	852
5842	hidnplayr	853	.loop:
		854	DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: new fragment"
3545	hidnplayr	855
5842	hidnplayr	856	mov ecx, [segmentsize]
		857	cmp ecx, [remaining]
		858	jbe @f
		859	mov ecx, [remaining]
		860	@@:
3545	hidnplayr	861
5015	hidnplayr	862	mov ax, ETHER_PROTO_IPv4
5842	hidnplayr	863	mov edx, [esp]
		864	add edx, [edx + NET_BUFF.offset]
		865	; add edx, ETH_header.DstMAC ; = 0
3545	hidnplayr	866	call ETH_output
5842	hidnplayr	867	jz .fail
3545	hidnplayr	868
5842	hidnplayr	869	push edi
		870	mov edx, ecx
		871
3545	hidnplayr	872	; copy header
5842	hidnplayr	873	mov esi, [headerptr]
		874	mov ecx, [headerlength]
		875	shr ecx, 2
3711	clevermous	876	rep movsd
3545	hidnplayr	877
		878	; copy data
5842	hidnplayr	879	mov esi, [dataptr]
		880	add esi, [offset]
		881	mov ecx, edx
		882	sub ecx, [headerlength]
		883	shr ecx, 2
		884	rep movsd
		885	pop edi
3545	hidnplayr	886
		887	; now, correct header
5842	hidnplayr	888	; packet length
		889	mov ax, dx
		890	xchg al, ah
		891	mov [edi + IPv4_header.TotalLength], ax
3545	hidnplayr	892
5842	hidnplayr	893	; offset
		894	mov eax, [offset]
		895	xchg al, ah
3545	hidnplayr	896
5842	hidnplayr	897	sub edx, [headerlength]
		898	sub [remaining], edx
		899	je @f
		900	jb .fail
		901	or ah, 1 shl 2 ; more fragments
		902	add [offset], edx
		903	@@:
		904	mov [edi + IPv4_header.FlagsAndFragmentOffset], ax
3545	hidnplayr	905
5842	hidnplayr	906	; Send the fragment
3545	hidnplayr	907	IPv4_checksum edi
		908	call [ebx + NET_DEVICE.transmit]
		909
5842	hidnplayr	910	cmp [remaining], 0
		911	jne .loop
3545	hidnplayr	912
5842	hidnplayr	913	call NET_BUFF_free
		914	ret
3545	hidnplayr	915
5842	hidnplayr	916	.fail:
3556	hidnplayr	917	DEBUGF DEBUG_NETWORK_ERROR, "Ipv4_fragment: failed\n"
5522	hidnplayr	918	call NET_BUFF_free
3545	hidnplayr	919	ret
		920
5842	hidnplayr	921	endp
3545	hidnplayr	922
		923
5842	hidnplayr	924
6011	hidnplayr	925	;-----------------------------------------------------------------;
		926	; ;
		927	; ipv4_route ;
		928	; ;
		929	; IN: eax = Destination IP ;
		930	; ebx = outgoing device / 0 ;
		931	; edx = Source IP ;
		932	; ;
6122	hidnplayr	933	; OUT: eax = Destination IP (may be gateway), 0 on error ;
6011	hidnplayr	934	; edx = Source IP ;
		935	; edi = device number*4 ;
		936	; ;
		937	; DESTROYED: ;
		938	; ecx ;
		939	; ;
		940	;-----------------------------------------------------------------;
3545	hidnplayr	941	align 4
6122	hidnplayr	942	ipv4_route:
3545	hidnplayr	943
5584	hidnplayr	944	test ebx, ebx
		945	jnz .got_device
		946
6220	hidnplayr	947	; Broadcast does not need gateway
3545	hidnplayr	948	cmp eax, 0xffffffff
		949	je .broadcast
		950
		951	xor edi, edi
		952	.loop:
7678	hidnplayr	953	mov ebx, [IPv4_address + edi]
		954	and ebx, [IPv4_subnet + edi]
3545	hidnplayr	955	jz .next
4052	hidnplayr	956	mov ecx, eax
7678	hidnplayr	957	and ecx, [IPv4_subnet + edi]
4052	hidnplayr	958	cmp ebx, ecx
		959	je .got_it
3545	hidnplayr	960	.next:
		961	add edi, 4
4052	hidnplayr	962	cmp edi, 4*NET_DEVICES_MAX
		963	jb .loop
3545	hidnplayr	964
7678	hidnplayr	965	mov eax, [IPv4_gateway + 4] ; TODO: let user (or a user space daemon) configure default route
3545	hidnplayr	966	.broadcast:
4052	hidnplayr	967	mov edi, 4 ; TODO: same as above
		968	.got_it:
		969	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_route: %u\n", edi
		970	test edx, edx
		971	jnz @f
7678	hidnplayr	972	mov edx, [IPv4_address + edi]
4052	hidnplayr	973	@@:
		974
3545	hidnplayr	975	ret
		976
5584	hidnplayr	977	.got_device:
		978	; Validate device ptr and convert to device number
6011	hidnplayr	979	call net_ptr_to_num4
5584	hidnplayr	980	cmp edi, -1
		981	je .fail
3545	hidnplayr	982
7678	hidnplayr	983	mov edx, [IPv4_address + edi] ; Source IP
3545	hidnplayr	984
6220	hidnplayr	985	; Broadcast does not need gateway
		986	cmp eax, 0xffffffff
		987	je @f
		988
5584	hidnplayr	989	; Check if we should route to gateway or not
7678	hidnplayr	990	mov ebx, [IPv4_address + edi]
		991	and ebx, [IPv4_subnet + edi]
5584	hidnplayr	992	mov ecx, eax
7678	hidnplayr	993	and ecx, [IPv4_subnet + edi]
6475	hidnplayr	994	cmp ecx, ebx
5584	hidnplayr	995	je @f
7678	hidnplayr	996	mov eax, [IPv4_gateway + edi]
5584	hidnplayr	997	@@:
6475	hidnplayr	998	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_route: %u\n", edi
5584	hidnplayr	999	ret
		1000
		1001	.fail:
6475	hidnplayr	1002	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_route failed\n"
6122	hidnplayr	1003	xor eax, eax
5584	hidnplayr	1004	ret
		1005
		1006
		1007
6011	hidnplayr	1008	;-----------------------------------------------------------------;
		1009	; ;
		1010	; ipv4_get_frgmnt_num ;
		1011	; ;
		1012	; IN: / ;
		1013	; ;
		1014	; OUT: ax = fragment number ;
		1015	; ;
		1016	;-----------------------------------------------------------------;
3545	hidnplayr	1017	align 4
6011	hidnplayr	1018	ipv4_get_frgmnt_num:
3545	hidnplayr	1019	xor ax, ax ;;; TODO: replace this with real code
		1020
		1021	ret
		1022
		1023
6011	hidnplayr	1024	;-----------------------------------------------------------------;
		1025	; ;
		1026	; ipv4_connect ;
		1027	; ;
		1028	; IN: eax = socket pointer ;
		1029	; ;
		1030	; OUT: eax = 0 on success ;
		1031	; eax = -1 on error ;
		1032	; ebx = error code on error ;
		1033	; ;
		1034	;-----------------------------------------------------------------;
4030	hidnplayr	1035	align 4
6011	hidnplayr	1036	ipv4_connect:
4030	hidnplayr	1037
4035	hidnplayr	1038	push eax edx
4030	hidnplayr	1039	lea ecx, [eax + SOCKET.mutex]
		1040	call mutex_lock
4035	hidnplayr	1041	pop edx eax
4030	hidnplayr	1042
		1043	; Fill in local IP
		1044	cmp [eax + IP_SOCKET.LocalIP], 0
		1045	jne @f
7678	hidnplayr	1046	push [IPv4_address + 4] ; FIXME: use correct local IP
4030	hidnplayr	1047	pop [eax + IP_SOCKET.LocalIP]
		1048
		1049	; Fill in remote IP
		1050	pushd [edx + 4]
		1051	pop [eax + IP_SOCKET.RemoteIP]
		1052
		1053	lea ecx, [eax + SOCKET.mutex]
		1054	call mutex_unlock
		1055
		1056	xor eax, eax
		1057	ret
		1058
		1059
6011	hidnplayr	1060	;-----------------------------------------------------------------;
		1061	; ;
		1062	; ipv4_API: Part of system function 76. ;
		1063	; ;
		1064	; IN: bl = subfunction number ;
		1065	; bh = device number ;
		1066	; ecx, edx, .. depends on subfunction ;
		1067	; ;
		1068	; OUT: depends on subfunction ;
		1069	; ;
		1070	;-----------------------------------------------------------------;
3545	hidnplayr	1071	align 4
6011	hidnplayr	1072	ipv4_api:
3545	hidnplayr	1073
		1074	movzx eax, bh
		1075	shl eax, 2
		1076
		1077	and ebx, 0x000000ff
		1078	cmp ebx, .number
		1079	ja .error
		1080	jmp dword [.table + 4*ebx]
		1081
		1082	.table:
		1083	dd .packets_tx ; 0
		1084	dd .packets_rx ; 1
		1085	dd .read_ip ; 2
		1086	dd .write_ip ; 3
		1087	dd .read_dns ; 4
		1088	dd .write_dns ; 5
		1089	dd .read_subnet ; 6
		1090	dd .write_subnet ; 7
		1091	dd .read_gateway ; 8
		1092	dd .write_gateway ; 9
		1093	.number = ($ - .table) / 4 - 1
		1094
		1095	.error:
		1096	mov eax, -1
		1097	ret
		1098
		1099	.packets_tx:
4052	hidnplayr	1100	mov eax, [IPv4_packets_tx + eax]
3545	hidnplayr	1101	ret
		1102
		1103	.packets_rx:
4052	hidnplayr	1104	mov eax, [IPv4_packets_rx + eax]
3545	hidnplayr	1105	ret
		1106
		1107	.read_ip:
7678	hidnplayr	1108	mov eax, [IPv4_address + eax]
3545	hidnplayr	1109	ret
		1110
		1111	.write_ip:
7678	hidnplayr	1112	mov [IPv4_address + eax], ecx
3545	hidnplayr	1113	mov edi, eax ; device number, we'll need it for ARP
		1114
		1115	; pre-calculate the local broadcast address
7678	hidnplayr	1116	mov ebx, [IPv4_subnet + eax]
3545	hidnplayr	1117	not ebx
		1118	or ebx, ecx
7678	hidnplayr	1119	mov [IPv4_broadcast + eax], ebx
3545	hidnplayr	1120
7679	hidnplayr	1121	mov ebx, [net_device_list + eax]
7678	hidnplayr	1122	mov eax, [IPv4_address + eax]
6011	hidnplayr	1123	call arp_output_request ; now send a gratuitous ARP
3545	hidnplayr	1124
6011	hidnplayr	1125	call net_send_event
3545	hidnplayr	1126	xor eax, eax
		1127	ret
		1128
		1129	.read_dns:
7678	hidnplayr	1130	mov eax, [IPv4_nameserver + eax]
3545	hidnplayr	1131	ret
		1132
		1133	.write_dns:
7678	hidnplayr	1134	mov [IPv4_nameserver + eax], ecx
6011	hidnplayr	1135	call net_send_event
3545	hidnplayr	1136	xor eax, eax
		1137	ret
		1138
		1139	.read_subnet:
7678	hidnplayr	1140	mov eax, [IPv4_subnet + eax]
3545	hidnplayr	1141	ret
		1142
		1143	.write_subnet:
7678	hidnplayr	1144	mov [IPv4_subnet + eax], ecx
3545	hidnplayr	1145
		1146	; pre-calculate the local broadcast address
7678	hidnplayr	1147	mov ebx, [IPv4_address + eax]
3545	hidnplayr	1148	not ecx
		1149	or ecx, ebx
7678	hidnplayr	1150	mov [IPv4_broadcast + eax], ecx
3545	hidnplayr	1151
6011	hidnplayr	1152	call net_send_event
3545	hidnplayr	1153	xor eax, eax
		1154	ret
		1155
		1156	.read_gateway:
7678	hidnplayr	1157	mov eax, [IPv4_gateway + eax]
3545	hidnplayr	1158	ret
		1159
		1160	.write_gateway:
7678	hidnplayr	1161	mov [IPv4_gateway + eax], ecx
3545	hidnplayr	1162
6011	hidnplayr	1163	call net_send_event
3545	hidnplayr	1164	xor eax, eax
9799	Boppan	1165	ret

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(root)/kernel/trunk/network/IPv4.inc @ 6916 – Rev 9802