1568 lines
42 KiB
PHP
1568 lines
42 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; Part of the tcp/ip network stack for KolibriOS ;;
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;; ;;
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;; Written by hidnplayr@kolibrios.org ;;
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;; ;;
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;; Based on the code of 4.4BSD ;;
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;; ;;
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;; GNU GENERAL PUBLIC LICENSE ;;
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;; Version 2, June 1991 ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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;-----------------------------------------------------------------
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;
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; TCP_input:
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;
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; IN: [esp] = ptr to buffer
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; [esp+4] = buffer size
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; ebx = ptr to device struct
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; ecx = segment size
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; esi = ptr to TCP segment
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; edi = ptr to ipv4 source address, followed by ipv4 dest address
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;
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; OUT: /
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;
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;-----------------------------------------------------------------
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align 4
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TCP_input:
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DEBUGF 1,"TCP_input: size=%u\n", ecx
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; First, re-calculate the checksum
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push ecx esi
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pushw [esi + TCP_header.Checksum]
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mov [esi + TCP_header.Checksum], 0
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TCP_checksum (edi), (edi+4)
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pop cx ; previous checksum
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cmp cx, dx
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pop edx ecx
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jne .drop_no_socket
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DEBUGF 1,"TCP_input: Checksum ok\n"
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and [edx + TCP_header.DataOffset], 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header)
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shr [edx + TCP_header.DataOffset], 2
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cmp [edx + TCP_header.DataOffset], sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header
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jb .drop_no_socket ; If not, drop the packet
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movzx eax, [edx + TCP_header.DataOffset]
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sub ecx, eax ; substract TCP header size from total segment size
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jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet
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DEBUGF 1,"TCP_input: %u bytes of data\n", ecx
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;-----------------------------------------------------------------------------------------
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; Check if this packet has a timestamp option (We do it here so we can process it quickly)
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cmp eax, sizeof.TCP_header + 12 ; Timestamp option is 12 bytes
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jb .no_timestamp
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je .is_ok
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cmp byte [edx + sizeof.TCP_header + 12], TCP_OPT_EOL ; end of option list
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jne .no_timestamp
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.is_ok:
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test [edx + TCP_header.Flags], TH_SYN ; SYN flag must not be set
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jnz .no_timestamp
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cmp dword [edx + sizeof.TCP_header], 0x0101080a ; Timestamp header
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jne .no_timestamp
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DEBUGF 1,"TCP_input: timestamp ok\n"
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; TODO: Parse the option
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; TODO: Set a Bit in the TCP to tell all options are parsed
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.no_timestamp:
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;-------------------------------------------
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; Convert Big-endian values to little endian
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ntohd [edx + TCP_header.SequenceNumber]
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ntohd [edx + TCP_header.AckNumber]
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ntohw [edx + TCP_header.Window]
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ntohw [edx + TCP_header.UrgentPointer]
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ntohw [edx + TCP_header.SourcePort]
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ntohw [edx + TCP_header.DestinationPort]
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;------------------------------------------------------------
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; Next thing to do is find the TCPS (thus, the socket pointer)
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; IP Packet TCP Destination Port = local Port
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; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0)
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; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0)
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mov ebx, net_sockets
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mov si, [edx + TCP_header.DestinationPort]
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.socket_loop:
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mov ebx, [ebx + SOCKET.NextPtr]
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or ebx, ebx
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jz .drop_with_reset_no_socket
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cmp [ebx + SOCKET.Domain], AF_INET4
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jne .socket_loop
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cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP
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jne .socket_loop
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cmp [ebx + TCP_SOCKET.LocalPort], si
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jne .socket_loop
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mov eax, [ebx + IP_SOCKET.RemoteIP]
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cmp eax, [edi] ; Ipv4 source addres
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je @f
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test eax, eax
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jnz .socket_loop
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@@:
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mov ax, [ebx + TCP_SOCKET.RemotePort]
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cmp [edx + TCP_header.SourcePort], ax
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je .found_socket
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test ax, ax
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jnz .socket_loop
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.found_socket: ; ebx now contains the socketpointer
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DEBUGF 1,"TCP_input: socket ptr=%x state=%u flags=%x\n", ebx, [ebx + TCP_SOCKET.t_state], [edx + TCP_header.Flags]:2
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; update stats
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inc [TCP_segments_rx] ; FIXME: correct interface?
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;----------------------------
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; Check if socket isnt closed
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cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED
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je .drop_not_locked
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;----------------
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; Lock the socket
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pusha
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pushf
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cli
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lea ecx, [ebx + SOCKET.mutex]
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call mutex_lock
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popf
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popa
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DEBUGF 1,"TCP_input: socket locked\n"
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;----------------------
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; set need_output to 0
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mov [ebx + TCP_SOCKET.sendalot], 0
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;---------------------------------------
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; unscale the window into a 32 bit value
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movzx eax, [edx + TCP_header.Window]
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push ecx
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mov cl, [ebx + TCP_SOCKET.SND_SCALE]
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shl eax, cl
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mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore
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pop ecx
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;-----------------------------------
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; Is this socket a listening socket?
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test [ebx + SOCKET.options], SO_ACCEPTCON
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jz .no_listening_socket
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DEBUGF 1,"TCP_input: Accepting new connection\n"
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pusha
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lea ecx, [ebx + SOCKET.mutex]
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call mutex_unlock
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popa
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push ecx edx esi edi ;;;
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call SOCKET_fork
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pop edi esi edx ecx
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test eax, eax
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jz .drop
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push dword [edi + 4] ; Ipv4 destination addres
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pop [eax + IP_SOCKET.LocalIP]
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push [edx + TCP_header.DestinationPort]
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pop [eax + TCP_SOCKET.LocalPort]
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mov [eax + TCP_SOCKET.t_state], TCPS_LISTEN
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mov ebx, eax
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jmp .LISTEN
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.no_listening_socket:
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;-------------------------------------
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; Reset idle timer and keepalive timer
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mov [ebx + TCP_SOCKET.t_idle], 0
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mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval
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;--------------------
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; Process TCP options
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movzx eax, [edx + TCP_header.DataOffset]
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cmp eax, sizeof.TCP_header ; Does header contain any options?
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je .no_options
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DEBUGF 1,"TCP_input: Segment has options\n"
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cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state
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jz .not_uni_xfer ; also no header prediction
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add eax, edx
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lea esi, [edx + sizeof.TCP_header]
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.opt_loop:
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cmp esi, eax ; are we scanning outside of header?
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jae .no_options
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cmp byte [esi], TCP_OPT_EOL ; end of option list?
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jz .no_options
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cmp byte [esi], TCP_OPT_NOP ; nop ?
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jz .opt_nop
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cmp byte [esi], TCP_OPT_MAXSEG
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je .opt_maxseg
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cmp byte [esi], TCP_OPT_WINDOW
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je .opt_window
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cmp byte [esi], TCP_OPT_TIMESTAMP
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je .opt_timestamp
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jmp .no_options ; If we reach here, some unknown options were received, skip them all!
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.opt_nop:
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inc edi
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jmp .opt_loop
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.opt_maxseg:
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cmp byte [esi+1], 4
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jne .no_options ; error occured, ignore all options!
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test [edx + TCP_header.Flags], TH_SYN
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jz @f
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movzx eax, word[esi+2]
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rol ax, 8
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DEBUGF 1,"TCP_input: Maxseg=%u\n", ax
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mov [ebx + TCP_SOCKET.t_maxseg], eax
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@@:
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add edi, 4
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jmp .opt_loop
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.opt_window:
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cmp byte [esi+1], 3
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jne .no_options
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test [edx + TCP_header.Flags], TH_SYN
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jz @f
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DEBUGF 1,"TCP_input: Got window option\n"
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;;;;;
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@@:
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add edi, 3
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jmp .opt_loop
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.opt_timestamp:
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cmp byte [esi+1], 10
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jne .no_options
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DEBUGF 1,"TCP_input: Got timestamp option\n"
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;;;;;
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add esi, 10
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jmp .opt_loop
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.no_options:
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;-----------------------------------------------------------------------
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; Time to do some header prediction (Original Principle by Van Jacobson)
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; There are two common cases for an uni-directional data transfer.
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;
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; General rule: the packets has no control flags, is in-sequence,
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; window width didnt change and we're not retransmitting.
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;
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; Second rules:
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; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer.
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; In this case we'll free the ACK'ed data and notify higher levels that we have free space in buffer
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;
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; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer.
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; If the packets are in order (data queue is empty), add the data to the socket buffer and request a delayed ACK
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cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED
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jnz .not_uni_xfer
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test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG
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jnz .not_uni_xfer
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test [edx + TCP_header.Flags], TH_ACK
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jz .not_uni_xfer
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mov eax, [edx + TCP_header.SequenceNumber]
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cmp eax, [ebx + TCP_SOCKET.RCV_NXT]
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jne .not_uni_xfer
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mov eax, dword [edx + TCP_header.Window]
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cmp eax, [ebx + TCP_SOCKET.SND_WND]
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jne .not_uni_xfer
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mov eax, [ebx + TCP_SOCKET.SND_NXT]
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cmp eax, [ebx + TCP_SOCKET.SND_MAX]
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jne .not_uni_xfer
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;---------------------------------------
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; check if we are sender in the uni-xfer
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; If the following 4 conditions are all true, this segment is a pure ACK.
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;
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; - The segment contains no data.
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test ecx, ecx
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jnz .not_sender
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; - The congestion window is greater than or equal to the current send window.
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; This test is true only if the window is fully open, that is, the connection is not in the middle of slow start or congestion avoidance.
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mov eax, [ebx + TCP_SOCKET.SND_CWND]
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cmp eax, [ebx + TCP_SOCKET.SND_WND]
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jb .not_uni_xfer
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; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent.
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mov eax, [edx + TCP_header.AckNumber]
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cmp eax, [ebx + TCP_SOCKET.SND_MAX]
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ja .not_uni_xfer
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; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number.
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sub eax, [ebx + TCP_SOCKET.SND_UNA]
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jbe .not_uni_xfer
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DEBUGF 1,"TCP_input: Header prediction: we are sender\n"
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;---------------------------------
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; Packet is a pure ACK, process it
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; Update RTT estimators
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;;; TODO
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; Delete acknowledged bytes from send buffer
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pusha
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mov ecx, eax
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lea eax, [ebx + STREAM_SOCKET.snd]
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call SOCKET_ring_free
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popa
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; update window pointers
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mov eax, [edx + TCP_header.AckNumber]
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mov [ebx + TCP_SOCKET.SND_UNA], eax
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; Stop retransmit timer
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mov [ebx + TCP_SOCKET.timer_retransmission], 0
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; Awaken waiting processes
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pusha
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lea ecx, [ebx + SOCKET.mutex]
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call mutex_unlock
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popa
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mov eax, ebx
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call SOCKET_notify_owner
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; Generate more output
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call TCP_output
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jmp .drop_not_locked
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;-------------------------------------------------
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; maybe we are the receiver in the uni-xfer then..
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.not_sender:
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; - The amount of data in the segment is greater than 0 (data count is in ecx)
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; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment.
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mov eax, [edx + TCP_header.AckNumber]
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cmp eax, [ebx + TCP_SOCKET.SND_UNA]
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jne .not_uni_xfer
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; - The reassembly list of out-of-order segments for the connection is empty (seg_next equals tp).
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;;; TODO
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jnz .not_uni_xfer
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; Complete processing of received data
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DEBUGF 1,"TCP_input: Header prediction: we are receiving %u bytes\n", ecx
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add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied
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movzx esi, [edx + TCP_header.DataOffset]
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add esi, edx
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lea eax, [ebx + STREAM_SOCKET.rcv]
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call SOCKET_ring_write ; Add the data to the socket buffer
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mov eax, ebx
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call SOCKET_notify_owner
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or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag
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jmp .drop
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;--------------------------------------------------
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; Header prediction failed, do it the slow way
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.not_uni_xfer:
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DEBUGF 1,"TCP_input: Header prediction failed\n"
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; Calculate receive window size
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; mov eax, [ebx + STREAM_SOCKET.rcv.size]
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; neg eax
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; add eax, SOCKETBUFFSIZE
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; mov edx, [ebx + TCP_SOCKET.RCV_ADV]
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; sub edx, [ebx + TCP_SOCKET.RCV_NXT]
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; cmp eax, edx
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; jae @f
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; mov eax, edx
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; @@:
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cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN
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je .LISTEN
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cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT
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je .SYN_SENT
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jmp .NOT_LISTEN_OR_SYN_SENT
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;-------------
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; Passive Open
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align 4
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.LISTEN:
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DEBUGF 1,"TCP_input: state=listen\n"
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test [edx + TCP_header.Flags], TH_RST ;;; TODO: kill new socket on error
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jnz .drop
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test [edx + TCP_header.Flags], TH_ACK
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jnz .drop_with_reset
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test [edx + TCP_header.Flags], TH_SYN
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jz .drop
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;;; TODO: check if it's a broadcast or multicast, and drop if so
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push dword [edi] ; Ipv4 source addres
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pop [ebx + IP_SOCKET.RemoteIP]
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push [edx + TCP_header.SourcePort]
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pop [ebx + TCP_SOCKET.RemotePort]
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push [edx + TCP_header.SequenceNumber]
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pop [ebx + TCP_SOCKET.IRS]
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push [TCP_sequence_num] ;;;;;
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add [TCP_sequence_num], 64000 / 2
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pop [ebx + TCP_SOCKET.ISS]
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push [ebx + TCP_SOCKET.ISS]
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pop [ebx + TCP_SOCKET.SND_NXT]
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TCP_sendseqinit ebx
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TCP_rcvseqinit ebx
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mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED
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mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW
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mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro
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lea eax, [ebx + STREAM_SOCKET.snd]
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call SOCKET_ring_create
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lea eax, [ebx + STREAM_SOCKET.rcv]
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call SOCKET_ring_create
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;;; call SOCKET_notify_owner
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jmp .trim_then_step6
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;------------
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; Active Open
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align 4
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.SYN_SENT:
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DEBUGF 1,"TCP_input: state=syn_sent\n"
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test [edx + TCP_header.Flags], TH_ACK
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jz @f
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mov eax, [edx + TCP_header.AckNumber]
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cmp eax, [ebx + TCP_SOCKET.ISS]
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jbe .drop_with_reset
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cmp eax, [ebx + TCP_SOCKET.SND_MAX]
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ja .drop_with_reset
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@@:
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test [edx + TCP_header.Flags], TH_RST
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jz @f
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test [edx + TCP_header.Flags], TH_ACK
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jz .drop
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mov eax, ebx
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mov ebx, ECONNREFUSED
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call TCP_drop
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jmp .drop
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@@:
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test [edx + TCP_header.Flags], TH_SYN
|
|
jz .drop
|
|
|
|
; at this point, segment seems to be valid
|
|
|
|
test [edx + TCP_header.Flags], TH_ACK
|
|
jz .no_syn_ack
|
|
|
|
; now, process received SYN in response to an active open
|
|
|
|
mov eax, [edx + TCP_header.AckNumber]
|
|
mov [ebx + TCP_SOCKET.SND_UNA], eax
|
|
cmp eax, [ebx + TCP_SOCKET.SND_NXT]
|
|
jbe @f
|
|
mov [ebx + TCP_SOCKET.SND_NXT], eax
|
|
@@:
|
|
|
|
.no_syn_ack:
|
|
|
|
mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; disable retransmission
|
|
|
|
push [edx + TCP_header.SequenceNumber]
|
|
pop [ebx + TCP_SOCKET.IRS]
|
|
|
|
TCP_rcvseqinit ebx
|
|
|
|
or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW
|
|
|
|
mov eax, [ebx + TCP_SOCKET.SND_UNA]
|
|
cmp eax, [ebx + TCP_SOCKET.ISS]
|
|
jbe .simultaneous_open
|
|
|
|
test [edx + TCP_header.Flags], TH_ACK
|
|
jz .simultaneous_open
|
|
|
|
DEBUGF 1,"TCP_input: active open\n"
|
|
|
|
;;; TODO: update stats
|
|
|
|
; set socket state to connected
|
|
mov [ebx + SOCKET.state], SS_ISCONNECTED
|
|
mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED
|
|
|
|
;;; TODO: check if we should scale the connection (567-572)
|
|
mov [ebx + TCP_SOCKET.SND_SCALE], 0
|
|
|
|
;;; TODO: update RTT estimators
|
|
|
|
jmp .trim_then_step6
|
|
|
|
.simultaneous_open:
|
|
|
|
DEBUGF 1,"TCP_input: simultaneous open\n"
|
|
; We have received a syn but no ACK, so we are having a simultaneous open..
|
|
mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;-------------------------------------
|
|
; Common processing for receipt of SYN
|
|
|
|
.trim_then_step6:
|
|
|
|
inc [edx + TCP_header.SequenceNumber]
|
|
|
|
;;; TODO: Drop any received data that follows receive window (590)
|
|
|
|
mov eax, [edx + TCP_header.SequenceNumber]
|
|
mov [ebx + TCP_SOCKET.RCV_UP], eax
|
|
dec eax
|
|
mov [ebx + TCP_SOCKET.SND_WL1], eax
|
|
|
|
jmp .ack_processed
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
.NOT_LISTEN_OR_SYN_SENT:
|
|
|
|
DEBUGF 1,"TCP_input: state is not listen or syn_sent\n"
|
|
|
|
;--------------------------------------------
|
|
; Protection Against Wrapped Sequence Numbers
|
|
|
|
; First, check if timestamp is present
|
|
|
|
;;;; TODO 602
|
|
|
|
; Then, check if at least some bytes of data are within window
|
|
|
|
;;;; TODO
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;----------------------------
|
|
; trim any data not in window
|
|
|
|
; check for duplicate data at beginning of segment
|
|
|
|
mov eax, [ebx + TCP_SOCKET.RCV_NXT]
|
|
sub eax, [edx + TCP_header.SequenceNumber]
|
|
jbe .no_duplicate
|
|
|
|
DEBUGF 1,"TCP_input: %u bytes duplicate data!\n", eax
|
|
|
|
test [edx + TCP_header.Flags], TH_SYN
|
|
jz .no_dup_syn
|
|
|
|
; remove duplicate syn
|
|
|
|
and [edx + TCP_header.Flags], not (TH_SYN)
|
|
inc [edx + TCP_header.SequenceNumber]
|
|
|
|
cmp [edx + TCP_header.UrgentPointer], 1
|
|
jbe @f
|
|
dec [edx + TCP_header.UrgentPointer]
|
|
jmp .dup_syn
|
|
@@:
|
|
and [edx + TCP_header.Flags], not (TH_URG)
|
|
.dup_syn:
|
|
dec eax
|
|
.no_dup_syn:
|
|
|
|
; eax holds number of bytes to drop
|
|
|
|
; Check for entire duplicate packet
|
|
|
|
cmp eax, ecx
|
|
jae .duplicate
|
|
|
|
DEBUGF 1,"TCP_input: Going to drop %u out of %u bytes\n", eax, ecx
|
|
|
|
;;; TODO: apply figure 28.30
|
|
|
|
; Check for duplicate FIN
|
|
|
|
test [edx + TCP_header.Flags], TH_FIN
|
|
jz .no_fin2
|
|
inc ecx
|
|
cmp eax, ecx
|
|
jne @f
|
|
|
|
mov eax, ecx
|
|
and [edx + TCP_header.Flags], not TH_FIN
|
|
or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW
|
|
dec ecx
|
|
jmp .no_duplicate
|
|
@@:
|
|
dec ecx
|
|
.no_fin2:
|
|
|
|
; Handle the case when a bound socket connects to itself
|
|
; Allow packets with a SYN and an ACK to continue with the processing
|
|
|
|
;-------------------------------------
|
|
; Generate duplicate ACK if nescessary
|
|
|
|
; This code also handles simultaneous half-open or self-connects
|
|
|
|
test eax, eax
|
|
jnz .drop_after_ack
|
|
|
|
cmp [edx + TCP_header.Flags], TH_ACK
|
|
jz .drop_after_ack
|
|
|
|
.duplicate:
|
|
|
|
DEBUGF 1,"TCP_input: Duplicate received\n"
|
|
|
|
;----------------------------------------
|
|
; Update statistics for duplicate packets
|
|
|
|
;;; TODO
|
|
|
|
jmp .drop_after_ack
|
|
|
|
.no_duplicate:
|
|
|
|
;-----------------------------------------------
|
|
; Remove duplicate data and update urgent offset
|
|
|
|
add [edx + TCP_header.SequenceNumber], eax
|
|
sub ecx, eax ;;;;;;;; Checkme
|
|
|
|
sub [edx + TCP_header.UrgentPointer], ax
|
|
ja @f
|
|
|
|
and [edx + TCP_header.Flags], not (TH_URG)
|
|
mov [edx + TCP_header.UrgentPointer], 0
|
|
@@:
|
|
|
|
;--------------------------------------------------
|
|
; Handle data that arrives after process terminates
|
|
|
|
cmp [ebx + SOCKET.PID], 0
|
|
ja @f
|
|
|
|
cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT
|
|
jbe @f
|
|
|
|
test ecx, ecx
|
|
jz @f
|
|
|
|
;;; Close the socket
|
|
;;; update stats
|
|
|
|
jmp .drop_with_reset
|
|
@@:
|
|
|
|
;----------------------------------------
|
|
; Remove data beyond right edge of window
|
|
|
|
mov eax, [edx + TCP_header.SequenceNumber]
|
|
add eax, ecx
|
|
sub eax, [ebx + TCP_SOCKET.RCV_NXT]
|
|
sub ax, [ebx + TCP_SOCKET.RCV_WND]
|
|
|
|
; eax now holds the number of bytes to drop
|
|
|
|
jbe .no_excess_data
|
|
|
|
;;; TODO: update stats
|
|
|
|
cmp eax, ecx
|
|
jb .dont_drop_all
|
|
|
|
;;; TODO 700-736
|
|
|
|
.dont_drop_all:
|
|
|
|
.no_excess_data:
|
|
|
|
;-----------------
|
|
; Record timestamp
|
|
|
|
;;; TODO 737-746
|
|
|
|
|
|
;------------------
|
|
; Process RST flags
|
|
|
|
test [edx + TCP_header.Flags], TH_RST
|
|
jz .no_rst
|
|
|
|
DEBUGF 1,"TCP_input: Got an RST flag\n"
|
|
|
|
mov eax, [ebx + TCP_SOCKET.t_state]
|
|
shl eax, 2
|
|
jmp dword [eax + .rst_sw_list]
|
|
|
|
.rst_sw_list:
|
|
dd .no_rst ; TCPS_CLOSED
|
|
dd .no_rst ; TCPS_LISTEN
|
|
dd .no_rst ; TCPS_SYN_SENT
|
|
dd .econnrefused ; TCPS_SYN_RECEIVED
|
|
dd .econnreset ; TCPS_ESTABLISHED
|
|
dd .econnreset ; TCPS_CLOSE_WAIT
|
|
dd .econnreset ; TCPS_FIN_WAIT_1
|
|
dd .rst_close ; TCPS_CLOSING
|
|
dd .rst_close ; TCPS_LAST_ACK
|
|
dd .econnreset ; TCPS_FIN_WAIT_2
|
|
dd .rst_close ; TCPS_TIMED_WAIT
|
|
|
|
.econnrefused:
|
|
DEBUGF 1,"TCP_input: Connection refused\n"
|
|
|
|
mov [ebx + SOCKET.errorcode], ECONNREFUSED
|
|
jmp .close
|
|
|
|
.econnreset:
|
|
DEBUGF 1,"TCP_input: Connection reset\n"
|
|
|
|
mov [ebx + SOCKET.errorcode], ECONNRESET
|
|
|
|
.close:
|
|
DEBUGF 1,"TCP_input: Closing connection\n"
|
|
|
|
mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED
|
|
;;; TODO: update stats (tcp drops)
|
|
mov eax, ebx
|
|
call TCP_close
|
|
jmp .drop
|
|
|
|
.rst_close:
|
|
DEBUGF 1,"TCP_input: Closing with reset\n"
|
|
|
|
mov eax, ebx
|
|
call TCP_close
|
|
jmp .drop
|
|
|
|
.no_rst:
|
|
|
|
|
|
;--------------------------------------
|
|
; handle SYN-full and ACK-less segments
|
|
|
|
test [edx + TCP_header.Flags], TH_SYN
|
|
jz @f
|
|
|
|
mov eax, ebx
|
|
mov ebx, ECONNRESET
|
|
call TCP_drop
|
|
jmp .drop_with_reset
|
|
@@:
|
|
|
|
;---------------
|
|
; ACK processing
|
|
|
|
test [edx + TCP_header.Flags], TH_ACK
|
|
jz .drop
|
|
|
|
cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED
|
|
jnz .no_syn_rcv
|
|
|
|
DEBUGF 1,"TCP_input: state=syn_received\n"
|
|
|
|
mov eax, [edx + TCP_header.AckNumber]
|
|
cmp [ebx + TCP_SOCKET.SND_UNA], eax
|
|
ja .drop_with_reset
|
|
cmp eax, [ebx + TCP_SOCKET.SND_MAX]
|
|
ja .drop_with_reset
|
|
|
|
;;; TODO: update stats
|
|
|
|
mov eax, ebx
|
|
call SOCKET_is_connected
|
|
mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED
|
|
|
|
; Do window scaling?
|
|
|
|
test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE
|
|
jz @f
|
|
test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE
|
|
jz @f
|
|
|
|
push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values
|
|
pop word [ebx + TCP_SOCKET.SND_SCALE]
|
|
@@:
|
|
|
|
;;; TODO: call TCP_reassemble
|
|
|
|
mov eax, [edx + TCP_header.SequenceNumber]
|
|
dec eax
|
|
mov [ebx + TCP_SOCKET.SND_WL1], eax
|
|
|
|
.no_syn_rcv:
|
|
|
|
; check for duplicate ACK
|
|
|
|
mov eax, [edx + TCP_header.AckNumber]
|
|
cmp eax, [ebx + TCP_SOCKET.SND_UNA]
|
|
ja .not_dup_ack
|
|
|
|
test ecx, ecx
|
|
jnz .reset_dupacks
|
|
|
|
mov eax, dword [edx + TCP_header.Window]
|
|
cmp eax, [ebx + TCP_SOCKET.SND_WND]
|
|
jne .reset_dupacks
|
|
|
|
DEBUGF 1,"TCP_input: Processing duplicate ACK\n"
|
|
|
|
cmp [ebx + TCP_SOCKET.timer_retransmission], 10000 ;;;; FIXME
|
|
ja @f
|
|
|
|
mov eax, [edx + TCP_header.AckNumber]
|
|
cmp eax, [ebx + TCP_SOCKET.SND_UNA]
|
|
je .dup_ack
|
|
|
|
@@:
|
|
mov [ebx + TCP_SOCKET.t_dupacks], 0
|
|
jmp .not_dup_ack
|
|
|
|
.dup_ack:
|
|
inc [ebx + TCP_SOCKET.t_dupacks]
|
|
cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh
|
|
jne .no_re_xmit
|
|
|
|
push [ebx + TCP_SOCKET.SND_NXT] ; >>>>
|
|
|
|
mov eax, [ebx + TCP_SOCKET.SND_WND]
|
|
cmp eax, [ebx + TCP_SOCKET.SND_CWND]
|
|
cmova eax, [ebx + TCP_SOCKET.SND_CWND]
|
|
shr eax, 1
|
|
push edx
|
|
xor edx, edx
|
|
div [ebx + TCP_SOCKET.t_maxseg]
|
|
cmp eax, 2
|
|
jae @f
|
|
mov ax, 2
|
|
@@:
|
|
mul [ebx + TCP_SOCKET.t_maxseg]
|
|
pop edx
|
|
mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax
|
|
|
|
mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; turn off retransmission timer
|
|
mov [ebx + TCP_SOCKET.t_rtt], 0
|
|
mov eax, [edx + TCP_header.AckNumber]
|
|
mov [ebx + TCP_SOCKET.SND_NXT], eax
|
|
mov eax, [ebx + TCP_SOCKET.t_maxseg]
|
|
mov [ebx + TCP_SOCKET.SND_CWND], eax
|
|
|
|
mov eax, ebx
|
|
call TCP_output ; retransmit missing segment
|
|
|
|
push edx
|
|
xor edx, edx
|
|
mov eax, [ebx + TCP_SOCKET.t_maxseg]
|
|
mul [ebx + TCP_SOCKET.t_dupacks]
|
|
pop edx
|
|
add eax, [ebx + TCP_SOCKET.SND_SSTHRESH]
|
|
mov [ebx + TCP_SOCKET.SND_CWND], eax
|
|
|
|
pop eax ; <<<<
|
|
cmp eax, [ebx + TCP_SOCKET.SND_NXT]
|
|
jb @f
|
|
mov [ebx + TCP_SOCKET.SND_NXT], eax
|
|
@@:
|
|
|
|
jmp .drop
|
|
|
|
|
|
.no_re_xmit:
|
|
jbe .not_dup_ack
|
|
|
|
DEBUGF 1,"TCP_input: Increasing congestion window\n"
|
|
|
|
mov eax, [ebx + TCP_SOCKET.t_maxseg]
|
|
add [ebx + TCP_SOCKET.SND_CWND], eax
|
|
|
|
mov eax, ebx
|
|
call TCP_output
|
|
|
|
jmp .drop
|
|
|
|
|
|
.not_dup_ack:
|
|
|
|
;-------------------------------------------------
|
|
; If the congestion window was inflated to account
|
|
; for the other side's cached packets, retract it
|
|
|
|
mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH]
|
|
cmp eax, [ebx + TCP_SOCKET.SND_CWND]
|
|
ja @f
|
|
cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh
|
|
jbe @f
|
|
mov [ebx + TCP_SOCKET.SND_CWND], eax
|
|
@@:
|
|
|
|
mov [ebx + TCP_SOCKET.t_dupacks], 0
|
|
|
|
mov eax, [edx + TCP_header.AckNumber]
|
|
cmp eax, [ebx + TCP_SOCKET.SND_MAX]
|
|
jbe @f
|
|
|
|
;;; TODO: update stats
|
|
jmp .drop_after_ack
|
|
|
|
@@:
|
|
|
|
mov edi, [edx + TCP_header.AckNumber]
|
|
sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi
|
|
|
|
;;; TODO: update stats
|
|
|
|
|
|
DEBUGF 1,"TCP_input: acceptable ACK for %u bytes\n", edi
|
|
|
|
;------------------------------------------
|
|
; RTT measurements and retransmission timer
|
|
|
|
;;;;; 912 - 926
|
|
|
|
mov [ebx + TCP_SOCKET.timer_retransmission], 0
|
|
|
|
mov eax, [ebx + TCP_SOCKET.SND_MAX]
|
|
cmp eax, [edx + TCP_header.AckNumber]
|
|
je .all_outstanding
|
|
mov [ebx + TCP_SOCKET.timer_retransmission], 120 ;;;; TODO: correct this value (use a macro for it)
|
|
|
|
.all_outstanding:
|
|
inc [ebx + TCP_SOCKET.sendalot] ; need output
|
|
|
|
;-------------------------------------------
|
|
; Open congestion window in response to ACKs
|
|
|
|
mov esi, [ebx + TCP_SOCKET.SND_CWND]
|
|
mov eax, [ebx + TCP_SOCKET.t_maxseg]
|
|
|
|
cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH]
|
|
jbe @f
|
|
push edx
|
|
push eax
|
|
mul eax
|
|
div esi
|
|
pop edx
|
|
shr edx, 3
|
|
add eax, edx
|
|
pop edx
|
|
@@:
|
|
|
|
add esi, eax
|
|
|
|
push ecx
|
|
mov cl, [ebx + TCP_SOCKET.SND_SCALE]
|
|
mov eax, TCP_max_win
|
|
shl eax, cl
|
|
pop ecx
|
|
|
|
cmp esi, eax
|
|
cmova esi, eax
|
|
mov [ebx + TCP_SOCKET.SND_CWND], esi
|
|
|
|
;------------------------------------------
|
|
; Remove acknowledged data from send buffer
|
|
|
|
cmp edi, [ebx + STREAM_SOCKET.snd.size]
|
|
jbe .finiacked
|
|
|
|
push ecx edx ebx
|
|
mov ecx, [ebx + STREAM_SOCKET.snd.size]
|
|
lea eax, [ebx + STREAM_SOCKET.snd]
|
|
sub [ebx + TCP_SOCKET.SND_WND], ecx
|
|
call SOCKET_ring_free
|
|
pop ebx edx ecx
|
|
|
|
DEBUGF 1,"TCP_input: our FIN is acked\n"
|
|
stc
|
|
|
|
jmp .wakeup
|
|
|
|
.finiacked:
|
|
|
|
push ecx edx ebx
|
|
mov ecx, edi
|
|
lea eax, [ebx + STREAM_SOCKET.snd]
|
|
call SOCKET_ring_free
|
|
pop ebx
|
|
sub [ebx + TCP_SOCKET.SND_WND], ecx
|
|
pop edx ecx
|
|
|
|
DEBUGF 1,"TCP_input: our FIN is not acked\n"
|
|
clc
|
|
|
|
;----------------------------------------
|
|
; Wake up process waiting on send buffer
|
|
|
|
.wakeup:
|
|
|
|
pushf
|
|
mov eax, ebx
|
|
call SOCKET_notify_owner
|
|
|
|
; Update TCPS
|
|
|
|
mov eax, [edx + TCP_header.AckNumber]
|
|
mov [ebx + TCP_SOCKET.SND_UNA], eax
|
|
cmp eax, [ebx + TCP_SOCKET.SND_NXT]
|
|
jb @f
|
|
mov [ebx + TCP_SOCKET.SND_NXT], eax
|
|
@@:
|
|
|
|
popf
|
|
|
|
; General ACK handling complete
|
|
; Now do the state-specific ones
|
|
|
|
mov eax, [ebx + TCP_SOCKET.t_state]
|
|
jmp dword [eax*4 + .ACK_sw_list]
|
|
|
|
.ACK_sw_list:
|
|
dd .ack_processed ; TCPS_CLOSED
|
|
dd .ack_processed ; TCPS_LISTEN
|
|
dd .ack_processed ; TCPS_SYN_SENT
|
|
dd .ack_processed ; TCPS_SYN_RECEIVED
|
|
dd .ack_processed ; TCPS_ESTABLISHED
|
|
dd .ack_processed ; TCPS_CLOSE_WAIT
|
|
dd .ack_fw1 ; TCPS_FIN_WAIT_1
|
|
dd .ack_c ; TCPS_CLOSING
|
|
dd .ack_la ; TCPS_LAST_ACK
|
|
dd .ack_processed ; TCPS_FIN_WAIT_2
|
|
dd .ack_tw ; TCPS_TIMED_WAIT
|
|
|
|
|
|
.ack_fw1:
|
|
jnc .ack_processed
|
|
|
|
test [ebx + SOCKET.state], SS_CANTRCVMORE
|
|
jnz @f
|
|
mov eax, ebx
|
|
call SOCKET_is_disconnected
|
|
;;; mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle ; FIXME
|
|
@@:
|
|
|
|
mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2
|
|
jmp .ack_processed
|
|
|
|
|
|
.ack_c:
|
|
jnc .ack_processed
|
|
|
|
mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT
|
|
mov eax, ebx
|
|
call TCP_cancel_timers
|
|
mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL
|
|
mov eax, ebx
|
|
call SOCKET_is_disconnected
|
|
jmp .ack_processed
|
|
|
|
|
|
.ack_la:
|
|
jnc .ack_processed
|
|
|
|
|
|
mov eax, ebx
|
|
call TCP_disconnect
|
|
jmp .drop
|
|
|
|
|
|
.ack_tw:
|
|
mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL
|
|
jmp .drop_after_ack
|
|
|
|
|
|
|
|
.reset_dupacks: ; We got a new ACK, reset duplicate ACK counter
|
|
|
|
mov [ebx + TCP_SOCKET.t_dupacks], 0
|
|
|
|
.ack_processed: ; (step 6)
|
|
|
|
DEBUGF 1,"TCP_input: ACK processed\n"
|
|
|
|
;----------------------------------------------
|
|
; check if we need to update window information
|
|
|
|
test [edx + TCP_header.Flags], TH_ACK
|
|
jz .no_window_update
|
|
|
|
mov eax, [ebx + TCP_SOCKET.SND_WL1]
|
|
cmp eax, [edx + TCP_header.SequenceNumber]
|
|
jb .update_window
|
|
ja @f
|
|
|
|
mov eax, [ebx + TCP_SOCKET.SND_WL2]
|
|
cmp eax, [edx + TCP_header.AckNumber]
|
|
jb .update_window
|
|
ja .no_window_update
|
|
@@:
|
|
|
|
mov eax, [ebx + TCP_SOCKET.SND_WL2]
|
|
cmp eax, [edx + TCP_header.AckNumber]
|
|
jne .no_window_update
|
|
|
|
mov eax, dword [edx + TCP_header.Window]
|
|
cmp eax, [ebx + TCP_SOCKET.SND_WND]
|
|
jbe .no_window_update
|
|
|
|
.update_window:
|
|
|
|
;;; TODO: Keep track of pure window updates
|
|
|
|
mov eax, dword [edx + TCP_header.Window]
|
|
cmp eax, [ebx + TCP_SOCKET.max_sndwnd]
|
|
jbe @f
|
|
mov [ebx + TCP_SOCKET.max_sndwnd], eax
|
|
@@:
|
|
mov [ebx + TCP_SOCKET.SND_WND], eax
|
|
|
|
DEBUGF 1,"TCP_input: Updating window to %u\n", eax
|
|
|
|
push [edx + TCP_header.SequenceNumber]
|
|
pop [ebx + TCP_SOCKET.SND_WL1]
|
|
|
|
push [edx + TCP_header.AckNumber]
|
|
pop [ebx + TCP_SOCKET.SND_WL2]
|
|
|
|
inc [ebx + TCP_SOCKET.sendalot]
|
|
|
|
.no_window_update:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;-----------------
|
|
; process URG flag
|
|
|
|
test [edx + TCP_header.Flags], TH_URG
|
|
jz .not_urgent
|
|
|
|
cmp [edx + TCP_header.UrgentPointer], 0
|
|
jz .not_urgent
|
|
|
|
cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT
|
|
je .not_urgent
|
|
|
|
; Ignore bogus urgent offsets
|
|
|
|
;;; 1040-1050
|
|
|
|
movzx eax, [edx + TCP_header.UrgentPointer]
|
|
add eax, [ebx + STREAM_SOCKET.rcv.size]
|
|
cmp eax, SOCKET_MAXDATA
|
|
jbe .not_urgent
|
|
|
|
mov [edx + TCP_header.UrgentPointer], 0
|
|
and [edx + TCP_header.Flags], not (TH_URG)
|
|
jmp .do_data
|
|
|
|
.not_urgent:
|
|
|
|
; processing of received urgent pointer
|
|
|
|
;;; TODO (1051-1093)
|
|
|
|
|
|
;---------------------------------------
|
|
; process the data in the segment (1094)
|
|
|
|
.do_data:
|
|
|
|
cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT
|
|
jae .final_processing
|
|
|
|
test [edx + TCP_header.Flags], TH_FIN
|
|
jnz @f
|
|
|
|
test ecx, ecx
|
|
jnz .final_processing
|
|
@@:
|
|
|
|
; call TCP_reassemble ;;; TODO
|
|
|
|
;---------------
|
|
; FIN processing
|
|
|
|
test [edx + TCP_header.Flags], TH_FIN
|
|
jz .no_fin
|
|
|
|
DEBUGF 1,"TCP_input: Processing FIN\n"
|
|
|
|
cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT
|
|
jae .not_first_fin
|
|
|
|
DEBUGF 1,"TCP_input: First FIN for this connection\n"
|
|
|
|
mov eax, ebx
|
|
call SOCKET_cant_recv_more
|
|
|
|
mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW
|
|
inc [ebx + TCP_SOCKET.RCV_NXT]
|
|
|
|
.not_first_fin:
|
|
mov eax, [ebx + TCP_SOCKET.t_state]
|
|
shl eax, 2
|
|
jmp dword [eax + .FIN_sw_list]
|
|
|
|
.FIN_sw_list:
|
|
dd .no_fin ; TCPS_CLOSED
|
|
dd .no_fin ; TCPS_LISTEN
|
|
dd .no_fin ; TCPS_SYN_SENT
|
|
dd .fin_syn_est ; TCPS_SYN_RECEIVED
|
|
dd .fin_syn_est ; TCPS_ESTABLISHED
|
|
dd .no_fin ; TCPS_CLOSE_WAIT
|
|
dd .fin_wait1 ; TCPS_FIN_WAIT_1
|
|
dd .no_fin ; TCPS_CLOSING
|
|
dd .no_fin ; TCPS_LAST_ACK
|
|
dd .fin_wait2 ; TCPS_FIN_WAIT_2
|
|
dd .fin_timed ; TCPS_TIMED_WAIT
|
|
|
|
.fin_syn_est:
|
|
|
|
mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT
|
|
jmp .no_fin
|
|
|
|
.fin_wait1:
|
|
|
|
mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING
|
|
jmp .no_fin
|
|
|
|
.fin_wait2:
|
|
|
|
mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT
|
|
mov eax, ebx
|
|
call TCP_cancel_timers
|
|
mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL
|
|
call SOCKET_is_disconnected
|
|
jmp .no_fin
|
|
|
|
.fin_timed:
|
|
mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL
|
|
jmp .no_fin
|
|
|
|
.no_fin:
|
|
|
|
|
|
|
|
|
|
;-----------------
|
|
; Final processing
|
|
|
|
.final_processing:
|
|
|
|
DEBUGF 1,"TCP_input: Final processing\n"
|
|
|
|
cmp [ebx + TCP_SOCKET.sendalot], 0
|
|
jne .need_output
|
|
|
|
test [ebx + TCP_SOCKET.t_flags], TF_ACKNOW
|
|
jz .dumpit
|
|
|
|
DEBUGF 1,"TCP_input: ACK now!\n"
|
|
|
|
.need_output:
|
|
|
|
pusha
|
|
lea ecx, [ebx + SOCKET.mutex]
|
|
call mutex_unlock
|
|
popa
|
|
|
|
push ebx
|
|
mov eax, ebx
|
|
call TCP_output
|
|
pop ebx
|
|
|
|
call kernel_free
|
|
add esp, 4
|
|
ret
|
|
|
|
.dumpit:
|
|
|
|
DEBUGF 1,"TCP_input: dumping\n"
|
|
|
|
pusha
|
|
lea ecx, [ebx + SOCKET.mutex]
|
|
call mutex_unlock
|
|
popa
|
|
|
|
call kernel_free
|
|
add esp, 4
|
|
ret
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;------------------------------------------
|
|
; Generate an ACK, droping incoming segment
|
|
|
|
align 4
|
|
.drop_after_ack:
|
|
|
|
DEBUGF 1,"TCP_input: Drop after ACK\n"
|
|
|
|
test [edx + TCP_header.Flags], TH_RST
|
|
jnz .drop
|
|
|
|
and [ebx + TCP_SOCKET.t_flags], TF_ACKNOW
|
|
|
|
pusha
|
|
lea ecx, [ebx + SOCKET.mutex]
|
|
call mutex_unlock
|
|
popa
|
|
|
|
push ebx
|
|
; mov cl, TH_ACK
|
|
; call TCP_respond_socket
|
|
mov eax, ebx
|
|
call TCP_output
|
|
pop ebx
|
|
|
|
call kernel_free
|
|
add esp, 4
|
|
ret
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;-------------------------------------------
|
|
; Generate an RST, dropping incoming segment
|
|
|
|
align 4
|
|
.drop_with_reset:
|
|
|
|
DEBUGF 1,"TCP_input: Drop with reset\n"
|
|
|
|
pusha
|
|
lea ecx, [ebx + SOCKET.mutex]
|
|
call mutex_unlock
|
|
popa
|
|
|
|
test [edx + TCP_header.Flags], TH_RST
|
|
jnz .drop
|
|
|
|
;;; if its a multicast/broadcast, also drop
|
|
|
|
test [edx + TCP_header.Flags], TH_ACK
|
|
jnz .respond_ack
|
|
|
|
test [edx + TCP_header.Flags], TH_SYN
|
|
jnz .respond_syn
|
|
|
|
call kernel_free
|
|
add esp, 4
|
|
ret
|
|
|
|
.respond_ack:
|
|
|
|
push ebx
|
|
mov cl, TH_RST
|
|
call TCP_respond_socket
|
|
pop ebx
|
|
jmp .destroy_new_socket
|
|
|
|
|
|
.respond_syn:
|
|
|
|
push ebx
|
|
mov cl, TH_RST + TH_ACK
|
|
call TCP_respond_socket
|
|
pop ebx
|
|
jmp .destroy_new_socket
|
|
|
|
|
|
|
|
|
|
|
|
;-----
|
|
; Drop
|
|
|
|
align 4
|
|
.drop:
|
|
|
|
pusha
|
|
lea ecx, [ebx + SOCKET.mutex]
|
|
call mutex_unlock
|
|
popa
|
|
|
|
.drop_not_locked:
|
|
|
|
DEBUGF 1,"TCP_input: Dropping packet\n"
|
|
|
|
;;;; If debugging options are enabled, output the packet somwhere
|
|
|
|
.destroy_new_socket:
|
|
|
|
;;;; kill the newly created socket
|
|
|
|
call kernel_free
|
|
add esp, 4
|
|
ret
|
|
|
|
|
|
|
|
|
|
.drop_with_reset_no_socket:
|
|
|
|
DEBUGF 1,"TCP_input: Drop with reset (no socket)\n"
|
|
|
|
test [edx + TCP_header.Flags], TH_RST
|
|
jnz .drop_no_socket
|
|
|
|
;;; if its a multicast/broadcast, also drop
|
|
|
|
test [edx + TCP_header.Flags], TH_ACK
|
|
jnz .respond_seg_ack
|
|
|
|
test [edx + TCP_header.Flags], TH_SYN
|
|
jnz .respond_seg_syn
|
|
|
|
.drop_no_socket:
|
|
|
|
DEBUGF 1,"TCP_input: Drop (no socket)\n"
|
|
|
|
call kernel_free
|
|
add esp, 4
|
|
ret
|
|
|
|
.respond_seg_ack:
|
|
|
|
mov cl, TH_RST
|
|
call TCP_respond_segment
|
|
jmp .drop_no_socket
|
|
|
|
.respond_seg_syn:
|
|
|
|
mov cl, TH_RST + TH_ACK
|
|
call TCP_respond_segment
|
|
jmp .drop_no_socket |