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  → /kernel/trunk/network/icmp.inc @ 5521

  → /kernel/trunk/network/icmp.inc @ 5522

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Regard whitespace Rev 5521 → Rev 5522

/kernel/trunk/network/icmp.inc
131,7 → 131,6
; and insert packets into sockets when needed
;
; IN: Pointer to buffer in [esp]
; size of buffer in [esp+4]
; ebx = pointer to device struct
; ecx = ICMP Packet size
; esi = ptr to ICMP Packet data
143,10 → 142,9
align 4
ICMP_input:
DEBUGF DEBUG_NETWORK_VERBOSE, "ICMP_input:\n"
DEBUGF DEBUG_NETWORK_VERBOSE, "ICMP_input\n"
; First, check the checksum (altough some implementations ignore it)
; Check the checksum
push esi ecx
push [esi + ICMP_header.Checksum]
mov [esi + ICMP_header.Checksum], 0
155,100 → 153,34
call checksum_2
pop si
cmp dx, si
pop ecx edx
pop ecx esi
jne .checksum_mismatch
; Check packet type
DEBUGF DEBUG_NETWORK_VERBOSE, "ICMP_input: Checksum OK\n"
cmp [edx + ICMP_header.Type], ICMP_ECHO ; Is this an echo request?
jne .check_sockets
; Update stats (and validate device ptr)
; Ualidate device ptr
mov eax, edi
call NET_ptr_to_num4
cmp edi, -1
je .dump
; Update stats
inc [ICMP_PACKETS_RX + edi]
; We well re-use the packet so we can create the response as fast as possible
; Notice: this only works on pure ethernet
; Is this an echo request?
cmp [esi + ICMP_header.Type], ICMP_ECHO
je .echo_request
DEBUGF DEBUG_NETWORK_VERBOSE, "got echo request\n"
mov [edx + ICMP_header.Type], ICMP_ECHOREPLY ; Change Packet type to reply
mov esi, [esp] ; Start of buffer
cmp ebx, LOOPBACK_DEVICE
je .loopback
; FIXME: dont assume device is an ethernet device!
; exchange dest and source address in IP header
; exchange dest and source MAC in ETH header
push dword [esi + ETH_header.DstMAC]
push dword [esi + ETH_header.SrcMAC]
pop dword [esi + ETH_header.DstMAC]
pop dword [esi + ETH_header.SrcMAC]
push word [esi + ETH_header.DstMAC + 4]
push word [esi + ETH_header.SrcMAC + 4]
pop word [esi + ETH_header.DstMAC + 4]
pop word [esi + ETH_header.SrcMAC + 4]
add esi, sizeof.ETH_header-4
.loopback:
add esi, 4
push [esi + IPv4_header.SourceAddress]
push [esi + IPv4_header.DestinationAddress]
pop [esi + IPv4_header.SourceAddress]
pop [esi + IPv4_header.DestinationAddress]
; Recalculate ip header checksum
movzx ecx, [esi + IPv4_header.VersionAndIHL] ; Calculate IP Header length by using IHL field
and ecx, 0x0f
shl cx, 2
mov edi, ecx ; IP header length
mov eax, edx ; ICMP packet start addr
push esi ; Calculate the IP checksum
xor edx, edx ;
call checksum_1 ;
call checksum_2 ;
pop esi ;
mov [esi + IPv4_header.HeaderChecksum], dx ;
; Recalculate ICMP CheckSum
movzx ecx, [esi + IPv4_header.TotalLength] ; Find length of IP Packet
xchg ch, cl ;
sub ecx, edi ; IP packet length - IP header length = ICMP packet length
mov esi, eax ; Calculate ICMP checksum
xor edx, edx ;
call checksum_1 ;
call checksum_2 ;
mov [eax + ICMP_header.Checksum], dx ;
; Transmit the packet (notice that packet ptr and packet size have been on stack since start of the procedure!)
call [ebx + NET_DEVICE.transmit]
test eax, eax
jnz @f
call NET_ptr_to_num4
inc [ICMP_PACKETS_TX + edi]
@@:
ret
.check_sockets:
; Look for an open ICMP socket
pusha
mov ecx, socket_mutex
call mutex_lock
popa
mov esi, [edi] ; ipv4 source address
mov edx, [eax] ; ipv4 source address
mov eax, net_sockets
.try_more:
; mov , [edx + ICMP_header.Identifier]
; mov , [esi + ICMP_header.Identifier]
.next_socket:
mov eax, [eax + SOCKET.NextPtr]
or eax, eax
260,18 → 192,12
cmp [eax + SOCKET.Protocol], IP_PROTO_ICMP
jne .next_socket
cmp [eax + IP_SOCKET.RemoteIP], esi
cmp [eax + IP_SOCKET.RemoteIP], edx
jne .next_socket
; cmp [eax + ICMP_SOCKET.Identifier],
; jne .next_socket
; Update stats (and validate device ptr)
call NET_ptr_to_num4
cmp edi, -1
je .dump_
inc [ICMP_PACKETS_RX + edi]
pusha
mov ecx, socket_mutex
call mutex_unlock
284,11 → 210,82
call mutex_lock
popa
mov esi, edx
jmp SOCKET_input
.echo_request:
; We'll reuse the packet so we can create the response as fast as possible
DEBUGF DEBUG_NETWORK_VERBOSE, "ICMP echo request\n"
; Change Packet type to reply
mov [esi + ICMP_header.Type], ICMP_ECHOREPLY
mov eax, [esp]
lea esi, [eax + NET_BUFF.data]
; Check frame type
cmp [eax + NET_BUFF.type], NET_BUFF_ETH
jne .not_ethernet
; exchange dest and source MAC in ETH header
push dword [esi + ETH_header.DstMAC]
push dword [esi + ETH_header.SrcMAC]
pop dword [esi + ETH_header.DstMAC]
pop dword [esi + ETH_header.SrcMAC]
push word [esi + ETH_header.DstMAC + 4]
push word [esi + ETH_header.SrcMAC + 4]
pop word [esi + ETH_header.DstMAC + 4]
pop word [esi + ETH_header.SrcMAC + 4]
add esi, sizeof.ETH_header
.not_ethernet:
; Exchange dest and source address in IP header
push [esi + IPv4_header.SourceAddress]
push [esi + IPv4_header.DestinationAddress]
pop [esi + IPv4_header.SourceAddress]
pop [esi + IPv4_header.DestinationAddress]
; Calculate IP header length
movzx ecx, [esi + IPv4_header.VersionAndIHL]
and ecx, 0x0f
shl cx, 2
mov edi, ecx ; put it in edi for later
; Calculate IP checksum
mov eax, esi
mov [eax + IPv4_header.HeaderChecksum], 0
xor edx, edx
call checksum_1
call checksum_2
mov [eax + IPv4_header.HeaderChecksum], dx
; Calculate ICMP packet length
movzx ecx, [eax + IPv4_header.TotalLength]
xchg ch, cl
sub ecx, edi ; IP packet length - IP header length = ICMP packet length
; Calculate ICMP checkSum
mov eax, esi
mov [esi + ICMP_header.Checksum], 0
xor edx, edx
call checksum_1
call checksum_2
mov [eax + ICMP_header.Checksum], dx
; Transmit the frame
DEBUGF DEBUG_NETWORK_VERBOSE, "ICMP transmitting reply\n"
call [ebx + NET_DEVICE.transmit]
test eax, eax
jnz @f
DEBUGF DEBUG_NETWORK_VERBOSE, "ICMP transmit failed\n"
call NET_ptr_to_num4
inc [ICMP_PACKETS_TX + edi]
@@:
ret
.dump_:
pusha
mov ecx, socket_mutex
call mutex_unlock
297,16 → 294,12
DEBUGF DEBUG_NETWORK_ERROR, "ICMP_input: no socket found\n"
jmp .dump
.checksum_mismatch:
DEBUGF DEBUG_NETWORK_ERROR, "ICMP_input: checksum mismatch\n"
.dump:
DEBUGF DEBUG_NETWORK_VERBOSE, "ICMP_input: dumping\n"
call NET_packet_free
add esp, 4 ; pop (balance stack)
call NET_BUFF_free
ret
400,7 → 393,6
jz .exit
pop esi
push edx
push eax
push edi ecx
426,7 → 418,6
ret
.exit:
DEBUGF DEBUG_NETWORK_ERROR, "Creating ICMP Packet failed\n"
add esp, 4
ret