;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2012. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; PPPoE.INC ;;
;; ;;
;; Part of the tcp/ip network stack for KolibriOS ;;
;; ;;
;; Written by hidnplayr@kolibrios.org ;;
;; ;;
;; GNU GENERAL PUBLIC LICENSE ;;
;; Version 2, June 1991 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
struct PPPoE_frame
VersionAndType db ?
Code db ?
SessionID dw ?
Length dw ? ; Length of payload, does NOT include the length PPPoE header.
Payload rb 0
ends
uglobal
PPPoE_SID dw ?
PPPoE_MAC dp ?
endg
;-----------------------------------------------------------------
;
; IPv4_init
;
; This function resets all IP variables
;
;-----------------------------------------------------------------
macro PPPoE_init {
call PPPoE_stop_connection
}
;-----------------------------------------------------------------
;
; PPPoE discovery input
;
; Handler of received Ethernet packet with type = Discovery
;
;
; IN: Pointer to buffer in [esp]
; size of buffer in [esp+4]
; pointer to device struct in ebx
; pointer to PPP header in edx
; size of PPP packet in ecx
; OUT: /
;
;-----------------------------------------------------------------
align 4
PPPoE_discovery_input:
DEBUGF 2,"PPPoE_discovery_input\n"
; First, find open PPPoE socket
mov eax, net_sockets
.next_socket:
mov eax, [eax + SOCKET.NextPtr]
or eax, eax
jz .dump
cmp [eax + SOCKET.Domain], AF_PPP
jne .next_socket
cmp [eax + SOCKET.Protocol], PPP_PROTO_ETHERNET
jne .next_socket
; Now, send it to the this socket
mov ecx, [esp + 4]
mov esi, [esp]
jmp SOCKET_input
.dump:
DEBUGF 1,'PPPoE_discovery_input: dumping\n'
call kernel_free
add esp, 4
ret
;--------------------------------------
;
; Send discovery packet
;
; IN: eax = socket pointer
; ecx = number of bytes to send
; esi = pointer to data
;
;--------------------------------------
align 4
PPPoE_discovery_output:
DEBUGF 2,"PPPoE_discovery_output: socket=%x buffer=%x size=%d\n", eax, esi, ecx
; RFC2516: An entire PADI packet (including the PPPoE header) MUST NOT
; exceed 1484 octets.
cmp ecx, 1484 + 14
ja .bad
; Check that device exists and is ethernet device
mov ebx, [eax + SOCKET.device]
cmp ebx, MAX_NET_DEVICES
ja .bad
mov ebx, [NET_DRV_LIST + 4*ebx]
test ebx, ebx
jz .bad
cmp [ebx + NET_DEVICE.type], NET_TYPE_ETH
jne .bad
DEBUGF 2,"PPPoE_discovery_output: device=%x\n", ebx
; Create packet.
push ecx esi
stdcall kernel_alloc, 1500
pop esi ecx
test eax, eax
jz .bad
mov edx, ecx
mov edi, eax
rep movsb
cmp edx, 60 ; Min ETH size
ja @f
mov edx, 60
@@:
push edx eax ; size and packet ptr for driver send proc
; Overwrite source MAC and protocol type
lea edi, [eax + ETH_header.SrcMAC]
lea esi, [ebx + ETH_DEVICE.mac]
movsd
movsw
mov ax, ETHER_PPP_DISCOVERY
stosw
; And send the packet
call [ebx + NET_DEVICE.transmit]
xor eax, eax
ret
.bad:
or eax, -1
ret
;-----------------------------------------------------------------
;
; PPPoE session input
;
; Handler of received Ethernet packet with type = Session
;
;
; IN: Pointer to buffer in [esp]
; size of buffer in [esp+4]
; pointer to device struct in ebx
; pointer to PPP header in edx
; size of PPP packet in ecx
; OUT: /
;
;-----------------------------------------------------------------
align 4
PPPoE_session_input:
cmp [edx + PPPoE_frame.VersionAndType], 0x11
jne .dump
cmp [edx + PPPoE_frame.Code], 0x00
jne .dump
movzx ecx, [edx + PPPoE_frame.Length]
xchg cl, ch
mov ax, [edx + PPPoE_frame.SessionID]
DEBUGF 2,"PPPoE_input: session ID=%x, length=%u\n", ax, cx
cmp ax, [PPPoE_SID]
jne .dump
mov ax, word [edx + PPPoE_frame.Payload]
add edx, PPPoE_frame.Payload + 2
cmp ax, PPP_IPv4
je IPv4_input
DEBUGF 2,"PPPoE_input: Unknown protocol=%x\n", ax
.dump:
DEBUGF 2,"PPPoE_input: dumping\n"
call kernel_free
add esp, 4
ret
;-----------------------------------------------------------------
;
; PPPoE_output
;
; IN:
; ebx = device ptr
; ecx = packet size
;
; di = protocol
;
; OUT: edi = 0 on error, pointer to buffer otherwise
; eax = buffer start
; ebx = to device structure
; ecx = unchanged (packet size of embedded data)
; edx = size of complete buffer
;
;-----------------------------------------------------------------
align 4
PPPoE_output:
DEBUGF 1,"PPPoE_output: size=%u device=%x\n", ecx, ebx
pushw di
pushw [PPPoE_SID]
lea eax, [ebx + ETH_DEVICE.mac]
lea edx, [PPPoE_MAC]
add ecx, PPPoE_frame.Payload + 2
mov di, ETHER_PPP_SESSION
call ETH_output
jz .eth_error
sub ecx, PPPoE_frame.Payload
mov [edi + PPPoE_frame.VersionAndType], 0x11
mov [edi + PPPoE_frame.Code], 0
popw [edi + PPPoE_frame.SessionID]
xchg cl, ch
mov [edi + PPPoE_frame.Length], cx
xchg cl, ch
pop word [edi + PPPoE_frame.Payload]
sub ecx, 2
add edi, PPPoE_frame.Payload + 2
DEBUGF 1,"PPPoE_output: success!\n"
ret
.eth_error:
add esp, 4
xor edi, edi
ret
align 4
PPPoE_start_connection:
cmp [PPPoE_SID], 0
jne .fail
mov [PPPoE_SID], cx
mov dword [PPPoE_MAC], edx
mov word [PPPoE_MAC + 4], si
xor eax, eax
ret
.fail:
or eax, -1
ret
align 4
PPPoE_stop_connection:
xor eax, eax
mov [PPPoE_SID], ax
mov dword [PPPoE_MAC], eax
mov word [PPPoE_MAC + 4], ax
ret
;---------------------------------------------------------------------------
;
; PPPoE API
;
; This function is called by system function 75
;
; IN: subfunction number in bl
; device number in bh
; ecx, edx, .. depends on subfunction
;
; OUT:
;
;---------------------------------------------------------------------------
align 4
PPPoE_api:
movzx eax, bh
shl eax, 2
and ebx, 0xff
cmp ebx, .number
ja .error
jmp dword [.table + 4*ebx]
.table:
dd PPPoE_start_connection ; 0
dd PPPoE_stop_connection ; 1
.number = ($ - .table) / 4 - 1
.error:
mov eax, -1
ret