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Rev 3640 Rev 3643
Line 174... Line 174...
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; Check validity and print some debug info
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; Check validity and print some debug info
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        cmp     ecx, sizeof.ARP_header
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        cmp     ecx, sizeof.ARP_header
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        jb      .exit
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        jb      .exit
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        call    NET_ptr_to_num
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        call    NET_ptr_to_num4
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        cmp     edi, -1
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        cmp     edi, -1
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        jz      .exit
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        jz      .exit
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        inc     [ARP_PACKETS_RX + 4*edi]        ; update stats
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        inc     [ARP_PACKETS_RX + edi]          ; update stats
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        DEBUGF  DEBUG_NETWORK_VERBOSE, "ARP_input: got packet from %u.%u.%u.%u through device %u\n",\
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        DEBUGF  DEBUG_NETWORK_VERBOSE, "ARP_input: got packet from %u.%u.%u.%u (device*4=%u)\n",\
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        [edx + ARP_header.SenderIP]:1, [edx + ARP_header.SenderIP + 1]:1,\
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        [edx + ARP_header.SenderIP]:1, [edx + ARP_header.SenderIP + 1]:1,\
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        [edx + ARP_header.SenderIP + 2]:1, [edx + ARP_header.SenderIP + 3]:1, edi
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        [edx + ARP_header.SenderIP + 2]:1, [edx + ARP_header.SenderIP + 3]:1, edi
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;------------------------------
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;------------------------------
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; First, check for IP collision
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; First, check for IP collision
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        mov     eax, [edx + ARP_header.SenderIP]
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        mov     eax, [edx + ARP_header.SenderIP]
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        cmp     eax, [IP_LIST + 4*edi]
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        cmp     eax, [IP_LIST + edi]
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        je      .collision
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        je      .collision
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;---------------------
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;---------------------
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; Handle reply packets
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; Handle reply packets
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        cmp     [edx + ARP_header.Opcode], ARP_REP_OPCODE
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        cmp     [edx + ARP_header.Opcode], ARP_REP_OPCODE
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        jne     .maybe_request
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        jne     .maybe_request
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        DEBUGF  DEBUG_NETWORK_VERBOSE, "ARP_input: It's a reply\n"
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        DEBUGF  DEBUG_NETWORK_VERBOSE, "ARP_input: It's a reply\n"
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        cmp     [edx + ARP_header.Opcode], ARP_REQ_OPCODE
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        cmp     [edx + ARP_header.Opcode], ARP_REQ_OPCODE
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        jne     .exit
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        jne     .exit
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        DEBUGF  DEBUG_NETWORK_VERBOSE, "ARP_input: its a request\n"
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        DEBUGF  DEBUG_NETWORK_VERBOSE, "ARP_input: its a request\n"
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        mov     eax, [IP_LIST + 4*edi]
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        mov     eax, [IP_LIST + edi]
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        cmp     eax, [edx + ARP_header.TargetIP]                ; Is it looking for my IP address?
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        cmp     eax, [edx + ARP_header.TargetIP]                ; Is it looking for my IP address?
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        jne     .exit
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        jne     .exit
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        movsd                                                   ; Move Sender Mac to Dest MAC
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        movsd                                                   ; Move Sender Mac to Dest MAC
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        movsw                                                   ;
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        movsw                                                   ;
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        movsd                                                   ; Move sender IP to Dest IP
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        movsd                                                   ; Move sender IP to Dest IP
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        pop     esi
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        pop     esi
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        mov     esi, [NET_DRV_LIST + 4*esi]
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        mov     esi, [NET_DRV_LIST + esi]
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        lea     esi, [esi + ETH_DEVICE.mac]
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        lea     esi, [esi + ETH_DEVICE.mac]
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        lea     edi, [edx + ARP_header.SenderMAC]
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        lea     edi, [edx + ARP_header.SenderMAC]
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        movsd                                                   ; Copy MAC address from in MAC_LIST
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        movsd                                                   ; Copy MAC address from in MAC_LIST
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        movsw                                                   ;
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        movsw                                                   ;
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        call    [ebx + NET_DEVICE.transmit]
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        call    [ebx + NET_DEVICE.transmit]
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        ret
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        ret
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  .collision:
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  .collision:
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        inc     [ARP_CONFLICTS + 4*edi]
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        inc     [ARP_CONFLICTS + edi]
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        DEBUGF  DEBUG_NETWORK_VERBOSE, "ARP_input: IP address conflict detected!\n"
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        DEBUGF  DEBUG_NETWORK_VERBOSE, "ARP_input: IP address conflict detected!\n"
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