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gbeauche |
1.1 |
/*
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| 2 |
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* tcp.cpp - ip router
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| 3 |
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*
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gbeauche |
1.3 |
* Basilisk II (C) 1997-2008 Christian Bauer
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gbeauche |
1.1 |
*
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* Windows platform specific code copyright (C) Lauri Pesonen
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Features implemented:
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* state machine, flow control, sequence numbers, RST/SYN/FIN/ACK/PSH
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*
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* Features not implemented:
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* oob data, urgent pointer, window sliding, some options
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* "Half-Nagle" implementation is a bit weird (mac-router interface; winsock has it on by default)
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*
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*
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* All possible tcp state machine transitions:
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*
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* CLOSED -> LISTEN passive open
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* CLOSED -> SYN_SENT active open SYN->
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*
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* LISTEN -> SYN_SENT send data SYN->
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* LISTEN -> SYN_RCVD ->SYN SYN+ACK->
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*
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* SYN_SENT -> SYN_RCVD ->SYN SYN+ACK->
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* SYN_SENT -> ESTABLISHED ->SYN+ACK ACK->
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* SYN_SENT -> CLOSED close/timeout
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*
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* SYN_RCVD -> CLOSED timeout RST->
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* SYN_RCVD -> LISTEN ->RST
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* SYN_RCVD -> ESTABLISHED ->ACK
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* SYN_RCVD -> FINWAIT_1 close FIN->
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*
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* ESTABLISHED -> FINWAIT_1 close FIN->
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* ESTABLISHED -> CLOSE_WAIT ->FIN ACK->
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*
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* CLOSE_WAIT -> LAST_ACK close FIN->
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*
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* LAST_ACK -> CLOSED ->ACK
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*
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* FINWAIT_1 -> CLOSING ->FIN ACK->
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* FINWAIT_1 -> FINWAIT_2 ->ACK
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* FINWAIT_1 -> TIME_WAIT ->FIN+ACK ACK->
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*
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* FINWAIT_2 -> TIME_WAIT ->FIN ACK->
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*
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* CLOSING -> TIME_WAIT ->ACK
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*
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* TIME_WAIT -> CLOSED timeout (2*msl)
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*
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*/
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#include "sysdeps.h"
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <process.h>
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#include "cpu_emulation.h"
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#include "ws2tcpip.h"
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#include "ether_windows.h"
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#include "ether.h"
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#include "prefs.h"
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#include "router.h"
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#include "router_types.h"
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#include "dynsockets.h"
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#include "iphelp.h"
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#include "tcp.h"
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#include "dump.h"
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gbeauche |
1.2 |
#include "mib/interfaces.h"
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gbeauche |
1.1 |
#include "ftp.h"
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#if DEBUG
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#pragma optimize("",off)
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#endif
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#include "debug.h"
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// If you need more, use multiple threads.
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#define MAX_SOCKETS MAXIMUM_WAIT_OBJECTS
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// If true, always sends the PSH tcp flag with data.
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// Otherwise only when a full buffer was received.
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#define PUSH_ALWAYS 0
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| 101 |
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// In milliseconds. A TCP implementation should implement
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// this dynamically, adapting the timeout value to match to the
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// averaged packet round-trip time.
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| 104 |
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#define RESEND_TIMEOUT 750
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| 106 |
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// Just time out incoming connections after 5 secs if Mac has no time to reply
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// No backlogs.
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#define SYN_FLOOD_PROTECTION_TIMEOUT 5000
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const int MAX_SEGMENT_SIZE = 1460;
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// Shorthands
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#define ISSET(f,x) ( ((f) & (x)) != 0 )
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#define ISCLEAR(f,x) ( ((f) & (x)) == 0 )
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// Local aliases
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#define URG tcp_flags_URG
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#define ACK tcp_flags_ACK
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#define PSH tcp_flags_PSH
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#define RST tcp_flags_RST
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#define SYN tcp_flags_SYN
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#define FIN tcp_flags_FIN
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// Local aliases
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#define CLOSED tcp_state_closed
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#define LISTEN tcp_state_listen
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#define SYN_SENT tcp_state_syn_sent
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#define SYN_RCVD tcp_state_syn_rcvd
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#define ESTABLISHED tcp_state_established
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#define CLOSE_WAIT tcp_state_close_wait
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#define LAST_ACK tcp_state_last_ack
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#define FINWAIT_1 tcp_state_finwait_1
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#define FINWAIT_2 tcp_state_finwait_2
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#define CLOSING tcp_state_closing
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#define TIME_WAIT tcp_state_time_wait
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// For debugging only
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static const char *_tcp_state_name[] = {
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"CLOSED",
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"LISTEN",
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"SYN_SENT",
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"SYN_RCVD",
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"ESTABLISHED",
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"CLOSE_WAIT",
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"LAST_ACK",
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"FINWAIT_1",
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"FINWAIT_2",
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"CLOSING",
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"TIME_WAIT"
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};
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#define STATENAME(i) _tcp_state_name[i]
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| 153 |
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static CRITICAL_SECTION tcp_section;
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typedef struct {
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SOCKET s;
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int state;
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| 159 |
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uint32 ip_src; // "source" is the mac, dest is the remote host,
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uint32 ip_dest; // no matter who opened the connection.
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uint16 src_port; // all in host byte order.
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uint16 dest_port;
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struct sockaddr_in from; // remote host address, network byte order.
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int from_len;
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// note: no true windows sliding, only one buffer.
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WSABUF buffers_read[1]; // data from remote host to Mac
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DWORD buffer_count_read;
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DWORD bytes_received;
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DWORD flags_read;
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WSAOVERLAPPED overlapped_read;
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WSABUF buffers_write[1]; // data from Mac to remote host
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DWORD buffer_count_write;
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DWORD bytes_written;
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DWORD flags_write;
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WSAOVERLAPPED overlapped_write;
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bool remote_closed; // remote will not send any more data
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bool accept_more_data_from_mac; // are we ready to accept more data from mac
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| 183 |
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uint32 seq_in; // will ack this mac sequence number
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uint32 seq_out; // next sequence number to mac (unless a resend is needed)
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uint32 mac_ack; // mac has acked this byte count. can be used to determined when to send some more data
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| 187 |
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uint32 bytes_to_send; // total send block size
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uint32 bytes_remaining_to_send; // unsent byte count
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| 189 |
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| 190 |
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uint16 mac_window; // mac tcp receive window, slides according to the window principle
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uint16 our_window; // not really used
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uint16 mac_mss; // maximum segment size that mac reported at SYN handshaking
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// resend info
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uint32 last_seq_out; // remember last packet seq number if a resend is needed
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uint32 resend_timeout; // currently set t0 0.75 secs but not updated
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uint32 stream_to_mac_stalled_until; // tick count indicating resend time
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| 198 |
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| 199 |
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DWORD time_wait; // do a graceful close after MSL*2
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DWORD msl;
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int child;
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WSAEVENT ev; // used to signal remote-initiated close and host-initiated connect.
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| 206 |
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bool in_use;
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} tcp_socket_t;
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| 209 |
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static tcp_socket_t sockets[MAX_SOCKETS];
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| 211 |
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typedef struct {
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| 212 |
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SOCKET s;
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| 213 |
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uint16 port;
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| 214 |
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uint32 ip;
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| 215 |
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uint32 iface;
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bool once;
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int parent;
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| 218 |
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WSAEVENT ev;
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| 219 |
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} tcp_listening_socket_t;
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| 220 |
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| 221 |
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static tcp_listening_socket_t l_sockets[MAX_SOCKETS];
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| 223 |
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static void CALLBACK tcp_read_completion(
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| 224 |
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DWORD error,
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DWORD bytes_read,
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LPWSAOVERLAPPED lpOverlapped,
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DWORD flags
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);
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| 230 |
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static void CALLBACK tcp_write_completion(
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DWORD error,
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DWORD bytes_read,
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LPWSAOVERLAPPED lpOverlapped,
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DWORD flags
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);
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| 236 |
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| 237 |
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// socket utilities assume that the critical section has already been entered.
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| 238 |
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static void free_socket( const int t )
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| 239 |
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{
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| 240 |
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_WSAResetEvent( sockets[t].ev );
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| 241 |
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if(sockets[t].s != INVALID_SOCKET) {
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| 242 |
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_closesocket( sockets[t].s );
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| 243 |
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sockets[t].s = INVALID_SOCKET;
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| 244 |
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}
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| 245 |
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sockets[t].state = CLOSED;
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| 246 |
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sockets[t].stream_to_mac_stalled_until = 0;
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| 247 |
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sockets[t].in_use = false;
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| 248 |
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sockets[t].time_wait = 0;
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| 249 |
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| 250 |
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// if there was an attached listening socket (ftp), close it.
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| 251 |
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int lst = sockets[t].child;
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| 252 |
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if( lst >= 0 ) {
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| 253 |
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if(l_sockets[lst].s != INVALID_SOCKET) {
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| 254 |
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D(bug(" closing listening socket %d\r\n", lst));
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| 255 |
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_closesocket( l_sockets[lst].s );
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| 256 |
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l_sockets[lst].s = INVALID_SOCKET;
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| 257 |
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}
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| 258 |
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l_sockets[lst].port = 0;
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| 259 |
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l_sockets[lst].parent = -1;
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| 260 |
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}
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| 261 |
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sockets[t].child = -1;
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| 262 |
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}
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| 263 |
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| 264 |
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static int alloc_socket()
|
| 265 |
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{
|
| 266 |
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static int last_allocated_socket = -1;
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| 267 |
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|
| 268 |
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int i = last_allocated_socket;
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| 269 |
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for( int j=0; j<MAX_SOCKETS; j++ ) {
|
| 270 |
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if( ++i >= MAX_SOCKETS ) i = 0;
|
| 271 |
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if( !sockets[i].in_use ) {
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| 272 |
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D(bug("<%d> Socket allocated\r\n", i));
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| 273 |
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| 274 |
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last_allocated_socket = i;
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| 275 |
|
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sockets[i].in_use = true;
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| 276 |
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|
| 277 |
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sockets[i].s = INVALID_SOCKET;
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| 278 |
|
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sockets[i].state = CLOSED;
|
| 279 |
|
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sockets[i].remote_closed = false;
|
| 280 |
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|
| 281 |
|
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sockets[i].accept_more_data_from_mac = false;
|
| 282 |
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|
| 283 |
|
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sockets[i].ip_src = sockets[i].ip_dest = 0;
|
| 284 |
|
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// sockets[i].src_port = sockets[i].dest_port = 0;
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| 285 |
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|
| 286 |
|
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memset( &sockets[i].overlapped_read, 0, sizeof(sockets[i].overlapped_read) );
|
| 287 |
|
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sockets[i].overlapped_read.hEvent = (HANDLE)i;
|
| 288 |
|
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memset( &sockets[i].overlapped_write, 0, sizeof(sockets[i].overlapped_write) );
|
| 289 |
|
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sockets[i].overlapped_write.hEvent = (HANDLE)i;
|
| 290 |
|
|
|
| 291 |
|
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sockets[i].bytes_received = 0;
|
| 292 |
|
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sockets[i].bytes_written = 0;
|
| 293 |
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|
| 294 |
|
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sockets[i].flags_read = 0;
|
| 295 |
|
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sockets[i].flags_write = 0;
|
| 296 |
|
|
|
| 297 |
|
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// sockets[i].from_len = sizeof(struct sockaddr_in);
|
| 298 |
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// memset( &sockets[i].from, 0, sizeof(sockets[i].from) );
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| 299 |
|
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// sockets[i].from.sin_family = AF_INET;
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| 300 |
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|
| 301 |
|
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sockets[i].buffer_count_read = 1;
|
| 302 |
|
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sockets[i].buffers_read[0].len = MAX_SEGMENT_SIZE;
|
| 303 |
|
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if(!sockets[i].buffers_read[0].buf) {
|
| 304 |
|
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sockets[i].buffers_read[0].buf = new char [sockets[i].buffers_read[0].len];
|
| 305 |
|
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}
|
| 306 |
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|
|
| 307 |
|
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sockets[i].buffer_count_write = 1;
|
| 308 |
|
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sockets[i].buffers_write[0].len = MAX_SEGMENT_SIZE;
|
| 309 |
|
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if(!sockets[i].buffers_write[0].buf) {
|
| 310 |
|
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sockets[i].buffers_write[0].buf = new char [sockets[i].buffers_write[0].len];
|
| 311 |
|
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}
|
| 312 |
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| 313 |
|
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sockets[i].mac_window = MAX_SEGMENT_SIZE; // updated for all mac datagrams
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| 314 |
|
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sockets[i].our_window = MAX_SEGMENT_SIZE; // should use about 8-16 kB, really
|
| 315 |
|
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sockets[i].mac_mss = 0; // not known yet
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| 316 |
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| 317 |
|
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sockets[i].time_wait = 0;
|
| 318 |
|
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sockets[i].msl = 5000L; // The round-trip time can be hard to estimate.
|
| 319 |
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|
|
| 320 |
|
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sockets[i].seq_in = 0;
|
| 321 |
|
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sockets[i].seq_out = 0x00000001;
|
| 322 |
|
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sockets[i].mac_ack = 0;
|
| 323 |
|
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sockets[i].stream_to_mac_stalled_until = 0;
|
| 324 |
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|
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| 325 |
|
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sockets[i].resend_timeout = RESEND_TIMEOUT;
|
| 326 |
|
|
|
| 327 |
|
|
sockets[i].child = -1;
|
| 328 |
|
|
|
| 329 |
|
|
break;
|
| 330 |
|
|
}
|
| 331 |
|
|
}
|
| 332 |
|
|
if(i == MAX_SOCKETS) {
|
| 333 |
|
|
D(bug("Out of free sockets\r\n"));
|
| 334 |
|
|
i = -1;
|
| 335 |
|
|
}
|
| 336 |
|
|
return i;
|
| 337 |
|
|
}
|
| 338 |
|
|
|
| 339 |
|
|
static int alloc_new_socket( const uint16 src_port, const uint16 dest_port, const uint32 ip_dest )
|
| 340 |
|
|
{
|
| 341 |
|
|
int t = alloc_socket();
|
| 342 |
|
|
|
| 343 |
|
|
if(t >= 0) {
|
| 344 |
|
|
sockets[t].s = _socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );
|
| 345 |
|
|
if(sockets[t].s == INVALID_SOCKET) {
|
| 346 |
|
|
free_socket( t );
|
| 347 |
|
|
t = -1;
|
| 348 |
|
|
} else {
|
| 349 |
|
|
sockets[t].src_port = src_port;
|
| 350 |
|
|
sockets[t].dest_port = dest_port;
|
| 351 |
|
|
|
| 352 |
|
|
sockets[t].from_len = sizeof(sockets[t].from);
|
| 353 |
|
|
memset( &sockets[t].from, 0, sockets[t].from_len );
|
| 354 |
|
|
sockets[t].from.sin_family = AF_INET;
|
| 355 |
|
|
sockets[t].from.sin_port = htons(dest_port);
|
| 356 |
|
|
sockets[t].from.sin_addr.s_addr = htonl(ip_dest);
|
| 357 |
|
|
|
| 358 |
|
|
struct sockaddr_in to;
|
| 359 |
|
|
memset( &to, 0, sizeof(to) );
|
| 360 |
|
|
to.sin_family = AF_INET;
|
| 361 |
|
|
|
| 362 |
|
|
if( _bind ( sockets[t].s, (const struct sockaddr *)&to, sizeof(to) ) == 0 ) {
|
| 363 |
|
|
D(bug("<%d> socket bound\r\n", t));
|
| 364 |
|
|
} else {
|
| 365 |
|
|
if( _WSAGetLastError() == WSAEINPROGRESS ) {
|
| 366 |
|
|
D(bug("<%d> bind: a blocking call is in progress.\r\n", t));
|
| 367 |
|
|
} else {
|
| 368 |
|
|
D(bug("<%d> bind failed with error code %d\r\n", t, _WSAGetLastError()));
|
| 369 |
|
|
}
|
| 370 |
|
|
free_socket( t );
|
| 371 |
|
|
t = -1;
|
| 372 |
|
|
}
|
| 373 |
|
|
}
|
| 374 |
|
|
}
|
| 375 |
|
|
return t;
|
| 376 |
|
|
}
|
| 377 |
|
|
|
| 378 |
|
|
static int get_socket_index( const uint16 src_port, const uint16 dest_port )
|
| 379 |
|
|
{
|
| 380 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 381 |
|
|
if(sockets[i].in_use && sockets[i].src_port == src_port && sockets[i].dest_port == dest_port ) {
|
| 382 |
|
|
return i;
|
| 383 |
|
|
}
|
| 384 |
|
|
}
|
| 385 |
|
|
return -1;
|
| 386 |
|
|
}
|
| 387 |
|
|
|
| 388 |
|
|
static int get_socket_index( const uint16 src_port )
|
| 389 |
|
|
{
|
| 390 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 391 |
|
|
if(sockets[i].in_use && sockets[i].src_port == src_port ) {
|
| 392 |
|
|
return i;
|
| 393 |
|
|
}
|
| 394 |
|
|
}
|
| 395 |
|
|
return -1;
|
| 396 |
|
|
}
|
| 397 |
|
|
|
| 398 |
|
|
static int find_socket( const uint16 src_port, const uint16 dest_port )
|
| 399 |
|
|
{
|
| 400 |
|
|
int i = get_socket_index( src_port, dest_port );
|
| 401 |
|
|
if( i < 0 ) {
|
| 402 |
|
|
i = get_socket_index( src_port );
|
| 403 |
|
|
if( i >= 0 ) {
|
| 404 |
|
|
if( sockets[i].s == INVALID_SOCKET ) {
|
| 405 |
|
|
D(bug("find_socket reusing slot %d...\r\n", i));
|
| 406 |
|
|
sockets[i].in_use = false;
|
| 407 |
|
|
} else {
|
| 408 |
|
|
D(bug("find_socket forcing close %d...\r\n", i));
|
| 409 |
|
|
free_socket( i );
|
| 410 |
|
|
}
|
| 411 |
|
|
i = -1;
|
| 412 |
|
|
}
|
| 413 |
|
|
}
|
| 414 |
|
|
|
| 415 |
|
|
D(bug("<%d> find_socket(%d,%d): %s\r\n", i, src_port, dest_port, i>=0 ? "found" : "not found"));
|
| 416 |
|
|
|
| 417 |
|
|
return i;
|
| 418 |
|
|
}
|
| 419 |
|
|
|
| 420 |
|
|
static int alloc_listen_socket( const uint16 port, const uint32 ip, const uint32 iface, const bool once )
|
| 421 |
|
|
{
|
| 422 |
|
|
static int last_allocated_socket = -1;
|
| 423 |
|
|
|
| 424 |
|
|
int i = last_allocated_socket;
|
| 425 |
|
|
|
| 426 |
|
|
for( int j=0; j<MAX_SOCKETS; j++ ) {
|
| 427 |
|
|
if( ++i >= MAX_SOCKETS ) i = 0;
|
| 428 |
|
|
if( l_sockets[i].port == 0 ) {
|
| 429 |
|
|
D(bug("[%d] Slot allocated for listening port %d\r\n", i, port));
|
| 430 |
|
|
l_sockets[i].port = port;
|
| 431 |
|
|
l_sockets[i].ip = ip;
|
| 432 |
|
|
l_sockets[i].iface = iface;
|
| 433 |
|
|
l_sockets[i].once = once;
|
| 434 |
|
|
l_sockets[i].parent = -1;
|
| 435 |
|
|
last_allocated_socket = i;
|
| 436 |
|
|
_WSAResetEvent( l_sockets[i].ev );
|
| 437 |
|
|
return i;
|
| 438 |
|
|
}
|
| 439 |
|
|
}
|
| 440 |
|
|
return -1;
|
| 441 |
|
|
}
|
| 442 |
|
|
|
| 443 |
|
|
static void tcp_start_listen( const int i )
|
| 444 |
|
|
{
|
| 445 |
|
|
if( l_sockets[i].port ) {
|
| 446 |
|
|
uint32 iface = l_sockets[i].iface;
|
| 447 |
|
|
|
| 448 |
|
|
D(bug("[%d] binding to interface 0x%08X\r\n", i, iface));
|
| 449 |
|
|
|
| 450 |
|
|
l_sockets[i].s = _socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );
|
| 451 |
|
|
if(l_sockets[i].s != INVALID_SOCKET) {
|
| 452 |
|
|
struct sockaddr_in to;
|
| 453 |
|
|
memset( &to, 0, sizeof(to) );
|
| 454 |
|
|
to.sin_family = AF_INET;
|
| 455 |
|
|
to.sin_port = htons( l_sockets[i].port );
|
| 456 |
|
|
to.sin_addr.s_addr = htonl( iface );
|
| 457 |
|
|
|
| 458 |
|
|
if( _bind ( l_sockets[i].s, (const struct sockaddr *)&to, sizeof(to) ) == 0 )
|
| 459 |
|
|
{
|
| 460 |
|
|
D(bug("[%d] socket bound to port %d on interface 0x%08X\r\n", i, l_sockets[i].port, iface));
|
| 461 |
|
|
if( _listen( l_sockets[i].s, SOMAXCONN ) == SOCKET_ERROR ) {
|
| 462 |
|
|
D(bug("[%d] listen() failed with error code %d\r\n", i, _WSAGetLastError()));
|
| 463 |
|
|
} else {
|
| 464 |
|
|
D(bug("[%d] listening to port %d\r\n", i, l_sockets[i].port));
|
| 465 |
|
|
_WSAResetEvent( l_sockets[i].ev );
|
| 466 |
|
|
if( SOCKET_ERROR == _WSAEventSelect( l_sockets[i].s, l_sockets[i].ev, FD_ACCEPT ) ) {
|
| 467 |
|
|
D(bug("[%d] WSAEventSelect() failed with error code %d\r\n", i, _WSAGetLastError()));
|
| 468 |
|
|
}
|
| 469 |
|
|
}
|
| 470 |
|
|
} else {
|
| 471 |
|
|
D(bug("[%d] bind to port %d failed with error code %d\r\n", i, l_sockets[i].port, _WSAGetLastError()));
|
| 472 |
|
|
}
|
| 473 |
|
|
} else {
|
| 474 |
|
|
D(bug("[%d] could not create a socket for port %d, error = %d\r\n", i, l_sockets[i].port, _WSAGetLastError()));
|
| 475 |
|
|
}
|
| 476 |
|
|
}
|
| 477 |
|
|
}
|
| 478 |
|
|
|
| 479 |
|
|
static void set_ttl( const int t, const uint8 ttl )
|
| 480 |
|
|
{
|
| 481 |
|
|
int _ttl = ttl; // defensive programming, I know VCx
|
| 482 |
|
|
|
| 483 |
|
|
if(_setsockopt( sockets[t].s, IPPROTO_IP, IP_TTL, (const char *)&_ttl, sizeof(int) ) == SOCKET_ERROR ) {
|
| 484 |
|
|
D(bug("<%d> could not set ttl to %d, error=%d\r\n", t, ttl, _WSAGetLastError()));
|
| 485 |
|
|
} else {
|
| 486 |
|
|
D(bug("<%d> ttl set to %d.\r\n", t, ttl));
|
| 487 |
|
|
}
|
| 488 |
|
|
}
|
| 489 |
|
|
|
| 490 |
|
|
static void tcp_reply( const int flags, const int t )
|
| 491 |
|
|
{
|
| 492 |
|
|
int tcp_size = sizeof(tcp_t);
|
| 493 |
|
|
|
| 494 |
|
|
tcp_t *tcp = (tcp_t *)malloc( tcp_size );
|
| 495 |
|
|
if(tcp) {
|
| 496 |
|
|
memcpy( tcp->ip.mac.dest, ether_addr, 6 );
|
| 497 |
|
|
memcpy( tcp->ip.mac.src, router_mac_addr, 6 );
|
| 498 |
|
|
tcp->ip.mac.type = htons(mac_type_ip4);
|
| 499 |
|
|
|
| 500 |
|
|
tcp->ip.version = 4;
|
| 501 |
|
|
tcp->ip.header_len = 5;
|
| 502 |
|
|
tcp->ip.tos = 0;
|
| 503 |
|
|
tcp->ip.total_len = htons(tcp_size - sizeof(mac_t));
|
| 504 |
|
|
tcp->ip.ident = htons(next_ip_ident_number++);
|
| 505 |
|
|
tcp->ip.flags_n_frag_offset = 0;
|
| 506 |
|
|
tcp->ip.ttl = 128;
|
| 507 |
|
|
tcp->ip.proto = ip_proto_tcp;
|
| 508 |
|
|
tcp->ip.src = htonl(sockets[t].ip_dest);
|
| 509 |
|
|
tcp->ip.dest = htonl(sockets[t].ip_src);
|
| 510 |
|
|
make_ip4_checksum( (ip_t *)tcp );
|
| 511 |
|
|
|
| 512 |
|
|
D(bug("<%d> Reply: Seq=%d, Ack=%d\r\n", t, sockets[t].seq_out, sockets[t].seq_in));
|
| 513 |
|
|
|
| 514 |
|
|
tcp->src_port = htons(sockets[t].dest_port);
|
| 515 |
|
|
tcp->dest_port = htons(sockets[t].src_port);
|
| 516 |
|
|
tcp->seq = htonl(sockets[t].seq_out);
|
| 517 |
|
|
tcp->ack = htonl(sockets[t].seq_in);
|
| 518 |
|
|
tcp->header_len = (uint8)( 20 << 2 );
|
| 519 |
|
|
tcp->flags = flags;
|
| 520 |
|
|
tcp->window = htons( sockets[t].our_window );
|
| 521 |
|
|
tcp->urgent_ptr = 0;
|
| 522 |
|
|
make_tcp_checksum( tcp, tcp_size );
|
| 523 |
|
|
|
| 524 |
|
|
// dump_bytes( (uint8 *)tcp, tcp_size );
|
| 525 |
|
|
|
| 526 |
|
|
enqueue_packet( (uint8 *)tcp, tcp_size );
|
| 527 |
|
|
free(tcp);
|
| 528 |
|
|
}
|
| 529 |
|
|
}
|
| 530 |
|
|
|
| 531 |
|
|
static bool has_mac_read_space( const int t )
|
| 532 |
|
|
{
|
| 533 |
|
|
uint32 pending_bytes = sockets[t].seq_out - sockets[t].mac_ack;
|
| 534 |
|
|
uint32 mac_can_accept_bytes = sockets[t].mac_window - pending_bytes;
|
| 535 |
|
|
|
| 536 |
|
|
D(bug("<%d> mac_can_accept_bytes = %d\r\n", t, mac_can_accept_bytes));
|
| 537 |
|
|
|
| 538 |
|
|
// Modified Nagle, effectively disabling window sliding (which I don't support anyway):
|
| 539 |
|
|
return pending_bytes == 0;
|
| 540 |
|
|
|
| 541 |
|
|
// Use more of window bandwidth
|
| 542 |
|
|
// Enabling this would require that the buffers seq numbers are stored somewhere
|
| 543 |
|
|
// return mac_can_accept_bytes >= sockets[t].buffers_read[0].len;
|
| 544 |
|
|
}
|
| 545 |
|
|
|
| 546 |
|
|
static bool b_recfrom( const int t )
|
| 547 |
|
|
{
|
| 548 |
|
|
bool result;
|
| 549 |
|
|
|
| 550 |
|
|
if( !has_mac_read_space(t) ) {
|
| 551 |
|
|
D(bug("<%d> read stalled, mac cannot accept any more data\r\n", t));
|
| 552 |
|
|
|
| 553 |
|
|
sockets[t].stream_to_mac_stalled_until = GetTickCount() + sockets[t].resend_timeout;
|
| 554 |
|
|
return true;
|
| 555 |
|
|
}
|
| 556 |
|
|
|
| 557 |
|
|
int ret = _WSARecv(
|
| 558 |
|
|
sockets[t].s,
|
| 559 |
|
|
sockets[t].buffers_read,
|
| 560 |
|
|
sockets[t].buffer_count_read,
|
| 561 |
|
|
&sockets[t].bytes_received,
|
| 562 |
|
|
&sockets[t].flags_read,
|
| 563 |
|
|
&sockets[t].overlapped_read,
|
| 564 |
|
|
tcp_read_completion
|
| 565 |
|
|
);
|
| 566 |
|
|
|
| 567 |
|
|
if(ret == SOCKET_ERROR) {
|
| 568 |
|
|
int socket_error = _WSAGetLastError();
|
| 569 |
|
|
if(socket_error == WSA_IO_PENDING) {
|
| 570 |
|
|
D(bug("<%d> WSARecv() i/o pending\r\n", t));
|
| 571 |
|
|
result = true;
|
| 572 |
|
|
} else {
|
| 573 |
|
|
D(bug("<%d> WSARecv() returned error %d\r\n", t, socket_error));
|
| 574 |
|
|
result = false;
|
| 575 |
|
|
}
|
| 576 |
|
|
} else /*if(ret == 0) */ {
|
| 577 |
|
|
D(bug("<%d> WSARecv() ok\r\n", t));
|
| 578 |
|
|
// Completion routine call is already scheduled.
|
| 579 |
|
|
result = true;
|
| 580 |
|
|
}
|
| 581 |
|
|
return result;
|
| 582 |
|
|
}
|
| 583 |
|
|
|
| 584 |
|
|
static bool b_send( const int t )
|
| 585 |
|
|
{
|
| 586 |
|
|
int ret = _WSASend(
|
| 587 |
|
|
sockets[t].s,
|
| 588 |
|
|
sockets[t].buffers_write,
|
| 589 |
|
|
sockets[t].buffer_count_write,
|
| 590 |
|
|
&sockets[t].bytes_written,
|
| 591 |
|
|
sockets[t].flags_write,
|
| 592 |
|
|
&sockets[t].overlapped_write,
|
| 593 |
|
|
tcp_write_completion
|
| 594 |
|
|
);
|
| 595 |
|
|
|
| 596 |
|
|
bool result;
|
| 597 |
|
|
if(ret == SOCKET_ERROR) {
|
| 598 |
|
|
int socket_error = _WSAGetLastError();
|
| 599 |
|
|
if(socket_error == WSA_IO_PENDING) {
|
| 600 |
|
|
D(bug("<%d> WSASend() i/o pending\r\n", t));
|
| 601 |
|
|
result = true;
|
| 602 |
|
|
} else {
|
| 603 |
|
|
D(bug("<%d> WSASend() returned %d\r\n", t, socket_error));
|
| 604 |
|
|
result = false;
|
| 605 |
|
|
}
|
| 606 |
|
|
} else /*if(ret == 0) */ {
|
| 607 |
|
|
D(bug("<%d> WSASend() ok\r\n", t));
|
| 608 |
|
|
// Completion routine call is already scheduled.
|
| 609 |
|
|
result = true;
|
| 610 |
|
|
}
|
| 611 |
|
|
return result;
|
| 612 |
|
|
}
|
| 613 |
|
|
|
| 614 |
|
|
static void send_buffer( const int t, const bool resending )
|
| 615 |
|
|
{
|
| 616 |
|
|
if(resending) {
|
| 617 |
|
|
if(sockets[t].last_seq_out == 0) {
|
| 618 |
|
|
D(bug("<%d> resend failure\r\n", t ));
|
| 619 |
|
|
return;
|
| 620 |
|
|
}
|
| 621 |
|
|
sockets[t].seq_out = sockets[t].last_seq_out;
|
| 622 |
|
|
} else {
|
| 623 |
|
|
sockets[t].last_seq_out = sockets[t].seq_out;
|
| 624 |
|
|
}
|
| 625 |
|
|
|
| 626 |
|
|
D(bug("<%d> %s data to Mac: Seq=%d, Ack=%d\r\n", t, (resending ? "resending" : "sending"), sockets[t].seq_out, sockets[t].seq_in));
|
| 627 |
|
|
|
| 628 |
|
|
uint32 bytes_read = sockets[t].bytes_received;
|
| 629 |
|
|
|
| 630 |
|
|
if( sockets[t].mac_mss && bytes_read > sockets[t].mac_mss ) {
|
| 631 |
|
|
D(bug("<%d> impossible: %d bytes to send, Mac mss is only %d\r\n", t, sockets[t].mac_mss && bytes_read, sockets[t].mac_mss));
|
| 632 |
|
|
}
|
| 633 |
|
|
|
| 634 |
|
|
int tcp_size = sizeof(tcp_t) + bytes_read;
|
| 635 |
|
|
|
| 636 |
|
|
tcp_t *tcp = (tcp_t *)malloc( tcp_size );
|
| 637 |
|
|
if(tcp) {
|
| 638 |
|
|
// Build MAC
|
| 639 |
|
|
// memcpy( tcp->ip.mac.dest, sockets[t].mac_src, 6 );
|
| 640 |
|
|
memcpy( tcp->ip.mac.dest, ether_addr, 6 );
|
| 641 |
|
|
memcpy( tcp->ip.mac.src, router_mac_addr, 6 );
|
| 642 |
|
|
tcp->ip.mac.type = htons(mac_type_ip4);
|
| 643 |
|
|
|
| 644 |
|
|
// Build IP
|
| 645 |
|
|
tcp->ip.version = 4;
|
| 646 |
|
|
tcp->ip.header_len = 5;
|
| 647 |
|
|
tcp->ip.tos = 0;
|
| 648 |
|
|
tcp->ip.total_len = htons(sizeof(tcp_t) - sizeof(mac_t) + bytes_read); // no options
|
| 649 |
|
|
tcp->ip.ident = htons(next_ip_ident_number++);
|
| 650 |
|
|
tcp->ip.flags_n_frag_offset = 0;
|
| 651 |
|
|
tcp->ip.ttl = 128; // one hop actually!
|
| 652 |
|
|
tcp->ip.proto = ip_proto_tcp;
|
| 653 |
|
|
tcp->ip.src = htonl(sockets[t].ip_dest);
|
| 654 |
|
|
tcp->ip.dest = htonl(sockets[t].ip_src);
|
| 655 |
|
|
make_ip4_checksum( (ip_t *)tcp );
|
| 656 |
|
|
|
| 657 |
|
|
// Copy payload (used by tcp checksum)
|
| 658 |
|
|
memcpy( (char *)tcp + sizeof(tcp_t), sockets[t].buffers_read[0].buf, bytes_read );
|
| 659 |
|
|
|
| 660 |
|
|
// Build tcp
|
| 661 |
|
|
tcp->src_port = htons(sockets[t].dest_port);
|
| 662 |
|
|
tcp->dest_port = htons(sockets[t].src_port);
|
| 663 |
|
|
|
| 664 |
|
|
tcp->seq = htonl(sockets[t].seq_out);
|
| 665 |
|
|
tcp->ack = htonl(sockets[t].seq_in);
|
| 666 |
|
|
|
| 667 |
|
|
tcp->header_len = (uint8)( 20 << 2 );
|
| 668 |
|
|
#if PUSH_ALWAYS
|
| 669 |
|
|
tcp->flags = ACK|PSH;
|
| 670 |
|
|
#else
|
| 671 |
|
|
tcp->flags = (bytes_read == MAX_SEGMENT_SIZE) ? ACK : (ACK|PSH);
|
| 672 |
|
|
#endif
|
| 673 |
|
|
tcp->window = htons( sockets[t].our_window );
|
| 674 |
|
|
tcp->urgent_ptr = 0;
|
| 675 |
|
|
make_tcp_checksum( tcp, tcp_size );
|
| 676 |
|
|
|
| 677 |
|
|
sockets[t].seq_out += bytes_read;
|
| 678 |
|
|
|
| 679 |
|
|
// dump_bytes( (uint8 *)tcp, tcp_size );
|
| 680 |
|
|
|
| 681 |
|
|
enqueue_packet( (uint8 *)tcp, tcp_size );
|
| 682 |
|
|
free(tcp);
|
| 683 |
|
|
}
|
| 684 |
|
|
}
|
| 685 |
|
|
|
| 686 |
|
|
static void CALLBACK tcp_read_completion(
|
| 687 |
|
|
DWORD error,
|
| 688 |
|
|
DWORD bytes_read,
|
| 689 |
|
|
LPWSAOVERLAPPED lpOverlapped,
|
| 690 |
|
|
DWORD flags
|
| 691 |
|
|
)
|
| 692 |
|
|
{
|
| 693 |
|
|
EnterCriticalSection( &tcp_section );
|
| 694 |
|
|
|
| 695 |
|
|
const int t = (int)lpOverlapped->hEvent;
|
| 696 |
|
|
|
| 697 |
|
|
sockets[t].bytes_received = bytes_read;
|
| 698 |
|
|
|
| 699 |
|
|
D(bug("<%d> tcp_read_completion(error=%d, bytes_read=%d)\r\n", t, error, bytes_read));
|
| 700 |
|
|
|
| 701 |
|
|
D(bug("<%d> tcp_read_completion() start, old state = %s\r\n", t, STATENAME(sockets[t].state)));
|
| 702 |
|
|
|
| 703 |
|
|
if(!sockets[t].in_use) {
|
| 704 |
|
|
D(bug("<%d> ignoring canceled read\r\n", t));
|
| 705 |
|
|
} else {
|
| 706 |
|
|
if( error != 0 ) {
|
| 707 |
|
|
D(bug("<%d> resetting after read error\r\n", t));
|
| 708 |
|
|
tcp_reply( RST, t );
|
| 709 |
|
|
free_socket(t);
|
| 710 |
|
|
} else {
|
| 711 |
|
|
if(bytes_read == 0) {
|
| 712 |
|
|
_closesocket( sockets[t].s );
|
| 713 |
|
|
sockets[t].s = INVALID_SOCKET;
|
| 714 |
|
|
} else if( bytes_read > 0) {
|
| 715 |
|
|
send_buffer( t, false );
|
| 716 |
|
|
}
|
| 717 |
|
|
|
| 718 |
|
|
switch( sockets[t].state ) {
|
| 719 |
|
|
case SYN_RCVD:
|
| 720 |
|
|
if( bytes_read == 0 ) {
|
| 721 |
|
|
D(bug("<%d> Closing: SYN_RCVD -> FINWAIT_1\r\n", t));
|
| 722 |
|
|
tcp_reply( ACK|FIN, t );
|
| 723 |
|
|
sockets[t].seq_out++;
|
| 724 |
|
|
sockets[t].state = FINWAIT_1;
|
| 725 |
|
|
}
|
| 726 |
|
|
break;
|
| 727 |
|
|
case ESTABLISHED:
|
| 728 |
|
|
if( bytes_read == 0 ) {
|
| 729 |
|
|
D(bug("<%d> Closing: ESTABLISHED -> FINWAIT_1\r\n", t));
|
| 730 |
|
|
tcp_reply( ACK|FIN, t );
|
| 731 |
|
|
sockets[t].seq_out++;
|
| 732 |
|
|
sockets[t].state = FINWAIT_1;
|
| 733 |
|
|
}
|
| 734 |
|
|
break;
|
| 735 |
|
|
case LISTEN:
|
| 736 |
|
|
tcp_reply( SYN, t );
|
| 737 |
|
|
sockets[t].seq_out++;
|
| 738 |
|
|
sockets[t].state = SYN_SENT;
|
| 739 |
|
|
sockets[t].time_wait = GetTickCount() + SYN_FLOOD_PROTECTION_TIMEOUT;
|
| 740 |
|
|
D(bug("<%d> LISTEN -> SYN_SENT\r\n", t));
|
| 741 |
|
|
break;
|
| 742 |
|
|
case CLOSE_WAIT:
|
| 743 |
|
|
if( bytes_read == 0) {
|
| 744 |
|
|
tcp_reply( ACK|FIN, t );
|
| 745 |
|
|
sockets[t].seq_out++;
|
| 746 |
|
|
sockets[t].state = LAST_ACK;
|
| 747 |
|
|
D(bug("<%d> Closing: CLOSE_WAIT -> LAST_ACK\r\n", t));
|
| 748 |
|
|
if(sockets[t].remote_closed) {
|
| 749 |
|
|
// Just in case that mac gets out of sync.
|
| 750 |
|
|
_closesocket(sockets[t].s);
|
| 751 |
|
|
sockets[t].s = INVALID_SOCKET;
|
| 752 |
|
|
}
|
| 753 |
|
|
}
|
| 754 |
|
|
break;
|
| 755 |
|
|
default:
|
| 756 |
|
|
break;
|
| 757 |
|
|
}
|
| 758 |
|
|
|
| 759 |
|
|
if(!is_router_shutting_down && sockets[t].s != INVALID_SOCKET) {
|
| 760 |
|
|
if(sockets[t].state != LISTEN) {
|
| 761 |
|
|
b_recfrom(t);
|
| 762 |
|
|
}
|
| 763 |
|
|
}
|
| 764 |
|
|
}
|
| 765 |
|
|
}
|
| 766 |
|
|
|
| 767 |
|
|
LeaveCriticalSection( &tcp_section );
|
| 768 |
|
|
}
|
| 769 |
|
|
|
| 770 |
|
|
static void CALLBACK tcp_write_completion(
|
| 771 |
|
|
DWORD error,
|
| 772 |
|
|
DWORD bytes_written,
|
| 773 |
|
|
LPWSAOVERLAPPED lpOverlapped,
|
| 774 |
|
|
DWORD flags
|
| 775 |
|
|
)
|
| 776 |
|
|
{
|
| 777 |
|
|
EnterCriticalSection( &tcp_section );
|
| 778 |
|
|
|
| 779 |
|
|
const int t = (int)lpOverlapped->hEvent;
|
| 780 |
|
|
|
| 781 |
|
|
sockets[t].bytes_written = bytes_written;
|
| 782 |
|
|
sockets[t].bytes_remaining_to_send -= bytes_written;
|
| 783 |
|
|
|
| 784 |
|
|
D(bug("<%d> tcp_write_completion(error=%d, bytes_written=%d)\r\n", t, error, bytes_written));
|
| 785 |
|
|
|
| 786 |
|
|
if(!sockets[t].in_use) {
|
| 787 |
|
|
D(bug("<%d> ignoring canceled write\r\n", t));
|
| 788 |
|
|
} else {
|
| 789 |
|
|
if(is_router_shutting_down || sockets[t].s == INVALID_SOCKET) {
|
| 790 |
|
|
D(bug("<%d> is not alive for sending.\r\n", t));
|
| 791 |
|
|
} else {
|
| 792 |
|
|
if( sockets[t].bytes_remaining_to_send <= 0 ) {
|
| 793 |
|
|
D(bug("<%d> all data sent, accepting some more.\r\n", t));
|
| 794 |
|
|
sockets[t].seq_in += sockets[t].bytes_to_send;
|
| 795 |
|
|
sockets[t].bytes_to_send = sockets[t].bytes_remaining_to_send = 0; // superfluous
|
| 796 |
|
|
tcp_reply( ACK, t );
|
| 797 |
|
|
sockets[t].accept_more_data_from_mac = true;
|
| 798 |
|
|
} else {
|
| 799 |
|
|
D(bug("<%d> %d bytes (of %d total) remaining, sending.\r\n", t, sockets[t].bytes_remaining_to_send, sockets[t].bytes_to_send));
|
| 800 |
|
|
sockets[t].buffers_write[0].len = sockets[t].bytes_remaining_to_send;
|
| 801 |
|
|
char *p = sockets[t].buffers_write[0].buf;
|
| 802 |
|
|
memmove( p, &p[bytes_written], sockets[t].bytes_remaining_to_send );
|
| 803 |
|
|
if(!b_send(t)) {
|
| 804 |
|
|
} else {
|
| 805 |
|
|
}
|
| 806 |
|
|
}
|
| 807 |
|
|
}
|
| 808 |
|
|
}
|
| 809 |
|
|
|
| 810 |
|
|
LeaveCriticalSection( &tcp_section );
|
| 811 |
|
|
}
|
| 812 |
|
|
|
| 813 |
|
|
static void tcp_connect_callback( const int t )
|
| 814 |
|
|
{
|
| 815 |
|
|
D(bug("<%d> tcp_connect_callback() start, old state = %s\r\n", t, STATENAME(sockets[t].state)));
|
| 816 |
|
|
|
| 817 |
|
|
switch( sockets[t].state ) {
|
| 818 |
|
|
case LISTEN:
|
| 819 |
|
|
tcp_reply( SYN|ACK, t );
|
| 820 |
|
|
sockets[t].seq_out++;
|
| 821 |
|
|
sockets[t].state = SYN_RCVD;
|
| 822 |
|
|
D(bug("<%d> Connect: LISTEN -> SYN_RCVD\r\n", t));
|
| 823 |
|
|
break;
|
| 824 |
|
|
default:
|
| 825 |
|
|
break;
|
| 826 |
|
|
}
|
| 827 |
|
|
D(bug("<%d> tcp_connect_callback() end, new state = %s\r\n", t, STATENAME(sockets[t].state)));
|
| 828 |
|
|
}
|
| 829 |
|
|
|
| 830 |
|
|
static void tcp_accept_callback( const int lst )
|
| 831 |
|
|
{
|
| 832 |
|
|
D(bug("[%d] tcp_accept_callback()\r\n", lst));
|
| 833 |
|
|
|
| 834 |
|
|
struct sockaddr_in to;
|
| 835 |
|
|
memset( &to, 0, sizeof(to) );
|
| 836 |
|
|
to.sin_family = AF_INET;
|
| 837 |
|
|
int tolen = sizeof(to);
|
| 838 |
|
|
|
| 839 |
|
|
SOCKET s = _accept( l_sockets[lst].s, (struct sockaddr *)&to, &tolen );
|
| 840 |
|
|
if( s == INVALID_SOCKET ) {
|
| 841 |
|
|
D(bug("[%d] connection not accepted, error code %d\r\n", lst, _WSAGetLastError()));
|
| 842 |
|
|
} else {
|
| 843 |
|
|
_WSAEventSelect( s, 0, 0 );
|
| 844 |
|
|
|
| 845 |
|
|
uint16 src_port = l_sockets[lst].port;
|
| 846 |
|
|
uint16 dest_port = ntohs(to.sin_port);
|
| 847 |
|
|
uint32 ip_dest = ntohl(to.sin_addr.s_addr);
|
| 848 |
|
|
|
| 849 |
|
|
D(bug("[%d] connection accepted, local port:%d, remote %s:%d\r\n", lst, src_port, _inet_ntoa(to.sin_addr), dest_port));
|
| 850 |
|
|
|
| 851 |
|
|
if( l_sockets[lst].ip != 0 && l_sockets[lst].ip != ip_dest ) {
|
| 852 |
|
|
_closesocket( s );
|
| 853 |
|
|
D(bug("[%d] authorization failure. connection closed.\r\n", lst ));
|
| 854 |
|
|
} else {
|
| 855 |
|
|
int t = alloc_new_socket( src_port, dest_port, ip_dest );
|
| 856 |
|
|
if( t < 0 ) {
|
| 857 |
|
|
D(bug("<%d> out of slot space, connection dropped\r\n", t ));
|
| 858 |
|
|
free_socket(t);
|
| 859 |
|
|
} else {
|
| 860 |
|
|
sockets[t].s = s;
|
| 861 |
|
|
sockets[t].state = LISTEN;
|
| 862 |
|
|
sockets[t].src_port = src_port;
|
| 863 |
|
|
sockets[t].dest_port = dest_port;
|
| 864 |
|
|
sockets[t].ip_src = macos_ip_address;
|
| 865 |
|
|
sockets[t].ip_dest = ip_dest;
|
| 866 |
|
|
|
| 867 |
|
|
sockets[t].seq_out = 0x00000001;
|
| 868 |
|
|
sockets[t].seq_in = 0; // not known yet
|
| 869 |
|
|
sockets[t].mac_ack = sockets[t].seq_out; // zero out pending bytes
|
| 870 |
|
|
|
| 871 |
|
|
tcp_reply( SYN, t );
|
| 872 |
|
|
sockets[t].seq_out++;
|
| 873 |
|
|
sockets[t].state = SYN_SENT;
|
| 874 |
|
|
sockets[t].time_wait = GetTickCount() + SYN_FLOOD_PROTECTION_TIMEOUT;
|
| 875 |
|
|
D(bug("<%d> Connect: LISTEN -> SYN_SENT\r\n", t));
|
| 876 |
|
|
|
| 877 |
|
|
_WSAResetEvent( sockets[t].ev );
|
| 878 |
|
|
if( SOCKET_ERROR == _WSAEventSelect( sockets[t].s, sockets[t].ev, FD_CLOSE ) ) {
|
| 879 |
|
|
D(bug("<%d> WSAEventSelect() failed with error code %d\r\n", t, _WSAGetLastError()));
|
| 880 |
|
|
}
|
| 881 |
|
|
|
| 882 |
|
|
// No data from the remote host is needed until the connection is established.
|
| 883 |
|
|
// So don't initiate read yet.
|
| 884 |
|
|
}
|
| 885 |
|
|
}
|
| 886 |
|
|
}
|
| 887 |
|
|
}
|
| 888 |
|
|
|
| 889 |
|
|
/*
|
| 890 |
|
|
MSS is the only option I care about, and since I'm on ethernet
|
| 891 |
|
|
I already pretty much know everything needed.
|
| 892 |
|
|
|
| 893 |
|
|
AFAIK window scaling is not in effect unless both parties specify it,
|
| 894 |
|
|
and I'm not doing it.
|
| 895 |
|
|
*/
|
| 896 |
|
|
static void process_options( const int t, const uint8 *opt, int len, uint32 &mss )
|
| 897 |
|
|
{
|
| 898 |
|
|
mss = 0;
|
| 899 |
|
|
|
| 900 |
|
|
while( len > 0 ) {
|
| 901 |
|
|
switch( *opt ) {
|
| 902 |
|
|
case 0: // End of Option List
|
| 903 |
|
|
D(bug("<%d> End of Option List\r\n", t));
|
| 904 |
|
|
len = 0;
|
| 905 |
|
|
break;
|
| 906 |
|
|
case 1: // No-Operation
|
| 907 |
|
|
D(bug("<%d> No-Operation\r\n", t));
|
| 908 |
|
|
len--;
|
| 909 |
|
|
opt++;
|
| 910 |
|
|
break;
|
| 911 |
|
|
case 2: // Maximum Segment Size
|
| 912 |
|
|
{
|
| 913 |
|
|
mss = ntohs( *((uint16 *)&opt[2]) );
|
| 914 |
|
|
D(bug("<%d> Maximum Segment Size = %d\r\n", t, mss));
|
| 915 |
|
|
len -= 4;
|
| 916 |
|
|
opt += 4;
|
| 917 |
|
|
}
|
| 918 |
|
|
break;
|
| 919 |
|
|
case 3: // Window Scale
|
| 920 |
|
|
{
|
| 921 |
|
|
int wscale = opt[2];
|
| 922 |
|
|
D(bug("<%d> Window Scale = %d\r\n", t, (int)wscale));
|
| 923 |
|
|
len -= 3;
|
| 924 |
|
|
opt += 3;
|
| 925 |
|
|
}
|
| 926 |
|
|
break;
|
| 927 |
|
|
case 4: // Sack-Permitted
|
| 928 |
|
|
D(bug("<%d> Sack-Permitted option is set\r\n", t));
|
| 929 |
|
|
len -= 2;
|
| 930 |
|
|
opt += 2;
|
| 931 |
|
|
break;
|
| 932 |
|
|
case 5: // Sack
|
| 933 |
|
|
{
|
| 934 |
|
|
int sack_len = opt[1];
|
| 935 |
|
|
int hf = (sack_len-2) / 4;
|
| 936 |
|
|
D(bug("<%d> Sack, %d half-blocks\r\n", t, hf));
|
| 937 |
|
|
len -= sack_len;
|
| 938 |
|
|
opt += sack_len;
|
| 939 |
|
|
}
|
| 940 |
|
|
break;
|
| 941 |
|
|
case 8: // Time Stamps
|
| 942 |
|
|
{
|
| 943 |
|
|
int valve = ntohl( *((uint32 *)&opt[2]) );
|
| 944 |
|
|
int ereply = ntohl( *((uint32 *)&opt[6]) );
|
| 945 |
|
|
D(bug("<%d> Time Stamps, TS valve = 0x%X, TS echo reply = 0x%X\r\n", t, valve, ereply));
|
| 946 |
|
|
len -= 10;
|
| 947 |
|
|
opt += 10;
|
| 948 |
|
|
}
|
| 949 |
|
|
break;
|
| 950 |
|
|
default:
|
| 951 |
|
|
D(bug("<%d> Unknown tcp header option 0x%02x, breaking out\r\n", t, (int)*opt));
|
| 952 |
|
|
len = 0;
|
| 953 |
|
|
break;
|
| 954 |
|
|
}
|
| 955 |
|
|
}
|
| 956 |
|
|
}
|
| 957 |
|
|
|
| 958 |
|
|
void write_tcp( tcp_t *tcp, int len )
|
| 959 |
|
|
{
|
| 960 |
|
|
if(len < sizeof(tcp_t)) {
|
| 961 |
|
|
D(bug("<%d> Too small tcp packet(%d) on unknown slot, dropped\r\n", -1, len));
|
| 962 |
|
|
return;
|
| 963 |
|
|
}
|
| 964 |
|
|
uint16 src_port = ntohs(tcp->src_port);
|
| 965 |
|
|
uint16 dest_port = ntohs(tcp->dest_port);
|
| 966 |
|
|
|
| 967 |
|
|
BOOL ok = true;
|
| 968 |
|
|
BOOL handle_data = false;
|
| 969 |
|
|
BOOL initiate_read = false;
|
| 970 |
|
|
|
| 971 |
|
|
EnterCriticalSection( &tcp_section );
|
| 972 |
|
|
|
| 973 |
|
|
int t = find_socket( src_port, dest_port );
|
| 974 |
|
|
|
| 975 |
|
|
if(t < 0) {
|
| 976 |
|
|
t = alloc_new_socket( src_port, dest_port, ntohl(tcp->ip.dest) );
|
| 977 |
|
|
ok = t >= 0;
|
| 978 |
|
|
}
|
| 979 |
|
|
|
| 980 |
|
|
if(ok) {
|
| 981 |
|
|
D(bug("<%d> write_tcp %d bytes from port %d to port %d\r\n", t, len, src_port, dest_port));
|
| 982 |
|
|
} else {
|
| 983 |
|
|
D(bug("<%d> FAILED write_tcp %d bytes from port %d to port %d\r\n", t, len, src_port, dest_port));
|
| 984 |
|
|
}
|
| 985 |
|
|
|
| 986 |
|
|
if( ok && ISSET(tcp->flags,RST) ) {
|
| 987 |
|
|
D(bug("<%d> RST set, resetting socket\r\n", t));
|
| 988 |
|
|
if( sockets[t].s != INVALID_SOCKET ) {
|
| 989 |
|
|
D(bug("<%d> doing an extra shutdown (ie4)\r\n", t));
|
| 990 |
|
|
_shutdown( sockets[t].s, SD_BOTH );
|
| 991 |
|
|
}
|
| 992 |
|
|
free_socket( t );
|
| 993 |
|
|
ok = false;
|
| 994 |
|
|
}
|
| 995 |
|
|
|
| 996 |
|
|
if(ok) {
|
| 997 |
|
|
D(bug("<%d> State machine start = %s\r\n", t, STATENAME(sockets[t].state)));
|
| 998 |
|
|
|
| 999 |
|
|
// always update receive window
|
| 1000 |
|
|
sockets[t].mac_window = ntohs(tcp->window);
|
| 1001 |
|
|
|
| 1002 |
|
|
int header_len = tcp->header_len >> 2;
|
| 1003 |
|
|
int option_bytes = header_len - 20;
|
| 1004 |
|
|
char *data = (char *)tcp + sizeof(tcp_t) + option_bytes;
|
| 1005 |
|
|
int dlen = len - sizeof(tcp_t) - option_bytes;
|
| 1006 |
|
|
|
| 1007 |
|
|
if( !ISSET(tcp->flags,ACK) ) {
|
| 1008 |
|
|
D(bug("<%d> ACK not set\r\n", t));
|
| 1009 |
|
|
}
|
| 1010 |
|
|
if( ISSET(tcp->flags,SYN) ) {
|
| 1011 |
|
|
D(bug("<%d> SYN set\r\n", t));
|
| 1012 |
|
|
|
| 1013 |
|
|
// Note that some options are valid even if there is no SYN.
|
| 1014 |
|
|
// I don't care about those however.
|
| 1015 |
|
|
|
| 1016 |
|
|
uint32 new_mss;
|
| 1017 |
|
|
process_options( t, (uint8 *)data - option_bytes, option_bytes, new_mss );
|
| 1018 |
|
|
if(new_mss) {
|
| 1019 |
|
|
sockets[t].mac_mss = (int)new_mss;
|
| 1020 |
|
|
if( new_mss < sockets[t].buffers_read[0].len ) {
|
| 1021 |
|
|
sockets[t].buffers_read[0].len = new_mss;
|
| 1022 |
|
|
}
|
| 1023 |
|
|
D(bug("<%d> Max segment size set to %d\r\n", t, new_mss));
|
| 1024 |
|
|
}
|
| 1025 |
|
|
}
|
| 1026 |
|
|
if( ISSET(tcp->flags,FIN) ) {
|
| 1027 |
|
|
D(bug("<%d> FIN set\r\n", t));
|
| 1028 |
|
|
}
|
| 1029 |
|
|
|
| 1030 |
|
|
// The sequence number Mac expects to see next time.
|
| 1031 |
|
|
sockets[t].mac_ack = ntohl(tcp->ack);
|
| 1032 |
|
|
|
| 1033 |
|
|
D(bug("<%d> From Mac: Seq=%d, Ack=%d, window=%d, router Seq=%d\r\n", t, ntohl(tcp->seq), sockets[t].mac_ack, sockets[t].mac_window, sockets[t].seq_out));
|
| 1034 |
|
|
|
| 1035 |
|
|
if( sockets[t].stream_to_mac_stalled_until &&
|
| 1036 |
|
|
sockets[t].mac_ack == sockets[t].seq_out &&
|
| 1037 |
|
|
(sockets[t].state == ESTABLISHED || sockets[t].state == CLOSE_WAIT) )
|
| 1038 |
|
|
{
|
| 1039 |
|
|
if( has_mac_read_space(t) ) {
|
| 1040 |
|
|
initiate_read = true;
|
| 1041 |
|
|
sockets[t].stream_to_mac_stalled_until = 0;
|
| 1042 |
|
|
D(bug("<%d> read resumed, mac can accept more data\r\n", t));
|
| 1043 |
|
|
}
|
| 1044 |
|
|
}
|
| 1045 |
|
|
|
| 1046 |
|
|
switch( sockets[t].state ) {
|
| 1047 |
|
|
case CLOSED:
|
| 1048 |
|
|
sockets[t].src_port = src_port;
|
| 1049 |
|
|
sockets[t].dest_port = dest_port;
|
| 1050 |
|
|
sockets[t].ip_src = ntohl(tcp->ip.src);
|
| 1051 |
|
|
sockets[t].ip_dest = ntohl(tcp->ip.dest);
|
| 1052 |
|
|
|
| 1053 |
|
|
if( ISSET(tcp->flags,SYN) ) {
|
| 1054 |
|
|
|
| 1055 |
|
|
sockets[t].seq_out = 0x00000001;
|
| 1056 |
|
|
sockets[t].seq_in = ntohl(tcp->seq) + 1;
|
| 1057 |
|
|
|
| 1058 |
|
|
_WSAResetEvent( sockets[t].ev );
|
| 1059 |
|
|
if( SOCKET_ERROR == _WSAEventSelect( sockets[t].s, sockets[t].ev, FD_CONNECT | FD_CLOSE ) ) {
|
| 1060 |
|
|
D(bug("<%d> WSAEventSelect() failed with error code %d\r\n", t, _WSAGetLastError()));
|
| 1061 |
|
|
}
|
| 1062 |
|
|
|
| 1063 |
|
|
D(bug("<%d> connecting local port %d to remote %s:%d\r\n", t, src_port, _inet_ntoa(sockets[t].from.sin_addr), dest_port));
|
| 1064 |
|
|
|
| 1065 |
|
|
sockets[t].state = LISTEN;
|
| 1066 |
|
|
if( _WSAConnect(
|
| 1067 |
|
|
sockets[t].s,
|
| 1068 |
|
|
(const struct sockaddr *)&sockets[t].from,
|
| 1069 |
|
|
sockets[t].from_len,
|
| 1070 |
|
|
NULL, NULL,
|
| 1071 |
|
|
NULL, NULL
|
| 1072 |
|
|
) == SOCKET_ERROR )
|
| 1073 |
|
|
{
|
| 1074 |
|
|
int connect_error = _WSAGetLastError();
|
| 1075 |
|
|
if( connect_error == WSAEWOULDBLOCK ) {
|
| 1076 |
|
|
D(bug("<%d> WSAConnect() i/o pending.\r\n", t));
|
| 1077 |
|
|
} else {
|
| 1078 |
|
|
D(bug("<%d> WSAConnect() failed with error %d.\r\n", t, connect_error));
|
| 1079 |
|
|
}
|
| 1080 |
|
|
} else {
|
| 1081 |
|
|
D(bug("<%d> WSAConnect() ok.\r\n", t));
|
| 1082 |
|
|
}
|
| 1083 |
|
|
} else {
|
| 1084 |
|
|
if( ISSET(tcp->flags,FIN) ) {
|
| 1085 |
|
|
D(bug("<%d> No SYN but FIN on a closed socket.\r\n", t));
|
| 1086 |
|
|
free_socket(t);
|
| 1087 |
|
|
} else {
|
| 1088 |
|
|
D(bug("<%d> No SYN on a closed socket. resetting.\r\n", t));
|
| 1089 |
|
|
free_socket(t);
|
| 1090 |
|
|
}
|
| 1091 |
|
|
}
|
| 1092 |
|
|
break;
|
| 1093 |
|
|
case LISTEN:
|
| 1094 |
|
|
// handled in connect callback
|
| 1095 |
|
|
break;
|
| 1096 |
|
|
case SYN_SENT:
|
| 1097 |
|
|
if( ISSET(tcp->flags,SYN) && ISSET(tcp->flags,ACK) ) {
|
| 1098 |
|
|
sockets[t].seq_in = ntohl(tcp->seq) + 1;
|
| 1099 |
|
|
tcp_reply( ACK, t );
|
| 1100 |
|
|
sockets[t].state = ESTABLISHED;
|
| 1101 |
|
|
initiate_read = true;
|
| 1102 |
|
|
sockets[t].accept_more_data_from_mac = true;
|
| 1103 |
|
|
sockets[t].time_wait = 0;
|
| 1104 |
|
|
} else if( ISSET(tcp->flags,SYN) ) {
|
| 1105 |
|
|
sockets[t].seq_in = ntohl(tcp->seq) + 1;
|
| 1106 |
|
|
tcp_reply( ACK|SYN, t );
|
| 1107 |
|
|
sockets[t].seq_out++;
|
| 1108 |
|
|
sockets[t].state = SYN_RCVD;
|
| 1109 |
|
|
sockets[t].time_wait = 0;
|
| 1110 |
|
|
} else if( ISSET(tcp->flags,ACK) ) {
|
| 1111 |
|
|
// What was the bright idea here.
|
| 1112 |
|
|
D(bug("<%d> State is SYN_SENT, but got only ACK from Mac??\r\n", t));
|
| 1113 |
|
|
sockets[t].state = FINWAIT_2;
|
| 1114 |
|
|
sockets[t].time_wait = 0;
|
| 1115 |
|
|
}
|
| 1116 |
|
|
break;
|
| 1117 |
|
|
case SYN_RCVD:
|
| 1118 |
|
|
if( ISSET(tcp->flags,ACK) ) {
|
| 1119 |
|
|
sockets[t].state = ESTABLISHED;
|
| 1120 |
|
|
handle_data = true;
|
| 1121 |
|
|
initiate_read = true;
|
| 1122 |
|
|
sockets[t].accept_more_data_from_mac = true;
|
| 1123 |
|
|
}
|
| 1124 |
|
|
break;
|
| 1125 |
|
|
case ESTABLISHED:
|
| 1126 |
|
|
if( ISSET(tcp->flags,FIN) ) {
|
| 1127 |
|
|
sockets[t].seq_in++;
|
| 1128 |
|
|
tcp_reply( ACK, t );
|
| 1129 |
|
|
_shutdown( sockets[t].s, SD_SEND );
|
| 1130 |
|
|
sockets[t].state = CLOSE_WAIT;
|
| 1131 |
|
|
}
|
| 1132 |
|
|
handle_data = true;
|
| 1133 |
|
|
break;
|
| 1134 |
|
|
case CLOSE_WAIT:
|
| 1135 |
|
|
// handled in tcp_read_completion
|
| 1136 |
|
|
break;
|
| 1137 |
|
|
case LAST_ACK:
|
| 1138 |
|
|
if( ISSET(tcp->flags,ACK) ) {
|
| 1139 |
|
|
D(bug("<%d> LAST_ACK received, socket closed\r\n", t));
|
| 1140 |
|
|
free_socket( t );
|
| 1141 |
|
|
}
|
| 1142 |
|
|
break;
|
| 1143 |
|
|
case FINWAIT_1:
|
| 1144 |
|
|
if( ISSET(tcp->flags,FIN) && ISSET(tcp->flags,ACK) ) {
|
| 1145 |
|
|
sockets[t].seq_in++;
|
| 1146 |
|
|
tcp_reply( ACK, t );
|
| 1147 |
|
|
if(sockets[t].remote_closed) {
|
| 1148 |
|
|
_closesocket(sockets[t].s);
|
| 1149 |
|
|
sockets[t].s = INVALID_SOCKET;
|
| 1150 |
|
|
} else {
|
| 1151 |
|
|
_shutdown( sockets[t].s, SD_SEND );
|
| 1152 |
|
|
}
|
| 1153 |
|
|
sockets[t].state = TIME_WAIT;
|
| 1154 |
|
|
sockets[t].time_wait = GetTickCount() + 2 * sockets[t].msl;
|
| 1155 |
|
|
} else if( ISSET(tcp->flags,FIN) ) {
|
| 1156 |
|
|
sockets[t].seq_in++;
|
| 1157 |
|
|
tcp_reply( ACK, t );
|
| 1158 |
|
|
if(sockets[t].remote_closed) {
|
| 1159 |
|
|
_closesocket(sockets[t].s);
|
| 1160 |
|
|
sockets[t].s = INVALID_SOCKET;
|
| 1161 |
|
|
} else {
|
| 1162 |
|
|
_shutdown( sockets[t].s, SD_SEND );
|
| 1163 |
|
|
}
|
| 1164 |
|
|
sockets[t].state = CLOSING;
|
| 1165 |
|
|
} else if( ISSET(tcp->flags,ACK) ) {
|
| 1166 |
|
|
sockets[t].state = FINWAIT_2;
|
| 1167 |
|
|
}
|
| 1168 |
|
|
break;
|
| 1169 |
|
|
case FINWAIT_2:
|
| 1170 |
|
|
if( ISSET(tcp->flags,FIN) ) {
|
| 1171 |
|
|
sockets[t].seq_in++;
|
| 1172 |
|
|
tcp_reply( ACK, t );
|
| 1173 |
|
|
if(sockets[t].remote_closed) {
|
| 1174 |
|
|
_closesocket(sockets[t].s);
|
| 1175 |
|
|
sockets[t].s = INVALID_SOCKET;
|
| 1176 |
|
|
} else {
|
| 1177 |
|
|
_shutdown( sockets[t].s, SD_SEND );
|
| 1178 |
|
|
}
|
| 1179 |
|
|
sockets[t].state = TIME_WAIT;
|
| 1180 |
|
|
sockets[t].time_wait = GetTickCount() + 2 * sockets[t].msl;
|
| 1181 |
|
|
}
|
| 1182 |
|
|
break;
|
| 1183 |
|
|
case CLOSING:
|
| 1184 |
|
|
if( ISSET(tcp->flags,ACK) ) {
|
| 1185 |
|
|
sockets[t].state = TIME_WAIT;
|
| 1186 |
|
|
sockets[t].time_wait = GetTickCount() + 2 * sockets[t].msl;
|
| 1187 |
|
|
}
|
| 1188 |
|
|
break;
|
| 1189 |
|
|
case TIME_WAIT:
|
| 1190 |
|
|
// Catching stray packets: wait MSL * 2 seconds, -> CLOSED
|
| 1191 |
|
|
// Timer already set since we might not get here at all.
|
| 1192 |
|
|
// I'm using exceptionally low MSL value (5 secs).
|
| 1193 |
|
|
D(bug("<%d> time wait, datagram discarded\r\n", t));
|
| 1194 |
|
|
break;
|
| 1195 |
|
|
}
|
| 1196 |
|
|
|
| 1197 |
|
|
// The "t" descriptor may already be freed. However, it's safe
|
| 1198 |
|
|
// to peek the state value inside the critical section.
|
| 1199 |
|
|
D(bug("<%d> State machine end = %s\r\n", t, STATENAME(sockets[t].state)));
|
| 1200 |
|
|
|
| 1201 |
|
|
D(bug("<%d> handle_data=%d, initiate_read=%d\r\n", t, handle_data, initiate_read));
|
| 1202 |
|
|
|
| 1203 |
|
|
if( handle_data && dlen && sockets[t].accept_more_data_from_mac ) {
|
| 1204 |
|
|
if( sockets[t].seq_in != ntohl(tcp->seq) ) {
|
| 1205 |
|
|
D(bug("<%d> dropping duplicate datagram seq=%d, expected=%d\r\n", t, ntohl(tcp->seq), sockets[t].seq_in));
|
| 1206 |
|
|
} else {
|
| 1207 |
|
|
set_ttl( t, tcp->ip.ttl );
|
| 1208 |
|
|
|
| 1209 |
|
|
struct sockaddr_in to;
|
| 1210 |
|
|
memset( &to, 0, sizeof(to) );
|
| 1211 |
|
|
to.sin_family = AF_INET;
|
| 1212 |
|
|
to.sin_port = tcp->dest_port;
|
| 1213 |
|
|
to.sin_addr.s_addr = tcp->ip.dest;
|
| 1214 |
|
|
|
| 1215 |
|
|
D(bug("<%d> sending %d bytes to remote host\r\n", t, dlen));
|
| 1216 |
|
|
|
| 1217 |
|
|
sockets[t].accept_more_data_from_mac = false;
|
| 1218 |
|
|
|
| 1219 |
|
|
if( dlen > MAX_SEGMENT_SIZE ) {
|
| 1220 |
|
|
D(bug("<%d> IMPOSSIBLE: b_send() dropped %d bytes! \r\n", t, dlen-MAX_SEGMENT_SIZE));
|
| 1221 |
|
|
dlen = MAX_SEGMENT_SIZE;
|
| 1222 |
|
|
}
|
| 1223 |
|
|
|
| 1224 |
|
|
memcpy( sockets[t].buffers_write[0].buf, data, dlen );
|
| 1225 |
|
|
|
| 1226 |
|
|
sockets[t].buffers_write[0].len = dlen;
|
| 1227 |
|
|
sockets[t].bytes_remaining_to_send = dlen;
|
| 1228 |
|
|
sockets[t].bytes_to_send = dlen;
|
| 1229 |
|
|
|
| 1230 |
|
|
bool send_now = false;
|
| 1231 |
|
|
if( ISSET(tcp->flags,PSH) ) {
|
| 1232 |
|
|
send_now = true;
|
| 1233 |
|
|
} else {
|
| 1234 |
|
|
// todo -- delayed send
|
| 1235 |
|
|
send_now = true;
|
| 1236 |
|
|
}
|
| 1237 |
|
|
|
| 1238 |
|
|
if(send_now) {
|
| 1239 |
|
|
|
| 1240 |
|
|
// Patch ftp server or client address if needed.
|
| 1241 |
|
|
|
| 1242 |
|
|
int lst = 1;
|
| 1243 |
|
|
bool is_pasv;
|
| 1244 |
|
|
uint16 ftp_data_port = 0;
|
| 1245 |
|
|
|
| 1246 |
|
|
if(ftp_is_ftp_port(sockets[t].src_port)) {
|
| 1247 |
|
|
// Local ftp server may be entering to passive mode.
|
| 1248 |
|
|
is_pasv = true;
|
| 1249 |
|
|
ftp_parse_port_command(
|
| 1250 |
|
|
sockets[t].buffers_write[0].buf,
|
| 1251 |
|
|
dlen,
|
| 1252 |
|
|
ftp_data_port,
|
| 1253 |
|
|
is_pasv
|
| 1254 |
|
|
);
|
| 1255 |
|
|
} else if(ftp_is_ftp_port(sockets[t].dest_port)) {
|
| 1256 |
|
|
// Local ftp client may be using port command.
|
| 1257 |
|
|
is_pasv = false;
|
| 1258 |
|
|
ftp_parse_port_command(
|
| 1259 |
|
|
sockets[t].buffers_write[0].buf,
|
| 1260 |
|
|
dlen,
|
| 1261 |
|
|
ftp_data_port,
|
| 1262 |
|
|
is_pasv
|
| 1263 |
|
|
);
|
| 1264 |
|
|
}
|
| 1265 |
|
|
|
| 1266 |
|
|
if(ftp_data_port) {
|
| 1267 |
|
|
D(bug("<%d> ftp %s command detected, port %d\r\n", t, (is_pasv ? "SERVER PASV REPLY" : "CLIENT PORT"), ftp_data_port ));
|
| 1268 |
|
|
|
| 1269 |
|
|
// Note: for security reasons, only allow incoming connection from sockets[t].ip_dest
|
| 1270 |
|
|
lst = alloc_listen_socket( ftp_data_port, sockets[t].ip_dest, 0/*iface*/, true );
|
| 1271 |
|
|
|
| 1272 |
|
|
if(lst < 0) {
|
| 1273 |
|
|
D(bug("<%d> no more free slots\r\n", t));
|
| 1274 |
|
|
} else {
|
| 1275 |
|
|
// First start listening (need to know the local name later)
|
| 1276 |
|
|
tcp_start_listen( lst );
|
| 1277 |
|
|
|
| 1278 |
|
|
// When t is closed, lst must be closed too.
|
| 1279 |
|
|
sockets[t].child = lst;
|
| 1280 |
|
|
l_sockets[lst].parent = t;
|
| 1281 |
|
|
|
| 1282 |
|
|
// Find out the local name
|
| 1283 |
|
|
struct sockaddr_in name;
|
| 1284 |
|
|
int namelen = sizeof(name);
|
| 1285 |
|
|
memset( &name, 0, sizeof(name) );
|
| 1286 |
|
|
if( _getsockname( sockets[t].s, (struct sockaddr *)&name, &namelen ) == SOCKET_ERROR ) {
|
| 1287 |
|
|
D(bug("_getsockname() failed, error=%d\r\n", _WSAGetLastError() ));
|
| 1288 |
|
|
}
|
| 1289 |
|
|
|
| 1290 |
|
|
ftp_modify_port_command(
|
| 1291 |
|
|
sockets[t].buffers_write[0].buf,
|
| 1292 |
|
|
dlen,
|
| 1293 |
|
|
MAX_SEGMENT_SIZE,
|
| 1294 |
|
|
ntohl(name.sin_addr.s_addr),
|
| 1295 |
|
|
ftp_data_port,
|
| 1296 |
|
|
is_pasv
|
| 1297 |
|
|
);
|
| 1298 |
|
|
|
| 1299 |
|
|
sockets[t].buffers_write[0].len = dlen;
|
| 1300 |
|
|
sockets[t].bytes_remaining_to_send = dlen;
|
| 1301 |
|
|
// Do not change "bytes_to_send" field as it is used for ack calculation
|
| 1302 |
|
|
}
|
| 1303 |
|
|
} // end of ftp patch
|
| 1304 |
|
|
|
| 1305 |
|
|
if(!b_send(t)) {
|
| 1306 |
|
|
// on error, close the ftp data listening socket if one was created
|
| 1307 |
|
|
if(lst >= 0) {
|
| 1308 |
|
|
D(bug("[%d] closing listening port %d after write error\r\n", t, l_sockets[lst].port));
|
| 1309 |
|
|
_closesocket( l_sockets[lst].s );
|
| 1310 |
|
|
l_sockets[lst].s = INVALID_SOCKET;
|
| 1311 |
|
|
l_sockets[lst].port = 0;
|
| 1312 |
|
|
l_sockets[lst].ip = 0;
|
| 1313 |
|
|
l_sockets[lst].parent = -1;
|
| 1314 |
|
|
sockets[t].child = -1;
|
| 1315 |
|
|
}
|
| 1316 |
|
|
}
|
| 1317 |
|
|
}
|
| 1318 |
|
|
}
|
| 1319 |
|
|
}
|
| 1320 |
|
|
|
| 1321 |
|
|
if(initiate_read) {
|
| 1322 |
|
|
if(!b_recfrom(t)) {
|
| 1323 |
|
|
// post icmp error message
|
| 1324 |
|
|
}
|
| 1325 |
|
|
}
|
| 1326 |
|
|
}
|
| 1327 |
|
|
|
| 1328 |
|
|
LeaveCriticalSection( &tcp_section );
|
| 1329 |
|
|
}
|
| 1330 |
|
|
|
| 1331 |
|
|
/*
|
| 1332 |
|
|
- Dispatch remote close and connect events.
|
| 1333 |
|
|
- Expire time-waits.
|
| 1334 |
|
|
- Handle resend timeouts.
|
| 1335 |
|
|
*/
|
| 1336 |
|
|
static WINAPI unsigned int tcp_connect_close_thread(void *arg)
|
| 1337 |
|
|
{
|
| 1338 |
|
|
WSAEVENT wait_handles[MAX_SOCKETS];
|
| 1339 |
|
|
|
| 1340 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 1341 |
|
|
wait_handles[i] = sockets[i].ev;
|
| 1342 |
|
|
}
|
| 1343 |
|
|
|
| 1344 |
|
|
while(!is_router_shutting_down) {
|
| 1345 |
|
|
DWORD ret = WaitForMultipleObjects(
|
| 1346 |
|
|
MAX_SOCKETS,
|
| 1347 |
|
|
wait_handles,
|
| 1348 |
|
|
FALSE,
|
| 1349 |
|
|
200
|
| 1350 |
|
|
);
|
| 1351 |
|
|
if(is_router_shutting_down) break;
|
| 1352 |
|
|
|
| 1353 |
|
|
EnterCriticalSection( &tcp_section );
|
| 1354 |
|
|
if( ret >= WAIT_OBJECT_0 && ret < WAIT_OBJECT_0 + MAX_SOCKETS ) {
|
| 1355 |
|
|
const int t = ret - WAIT_OBJECT_0;
|
| 1356 |
|
|
|
| 1357 |
|
|
D(bug("<%d> Event %d\r\n", t, ret));
|
| 1358 |
|
|
|
| 1359 |
|
|
if(sockets[t].in_use) {
|
| 1360 |
|
|
WSANETWORKEVENTS what;
|
| 1361 |
|
|
|
| 1362 |
|
|
if( _WSAEnumNetworkEvents( sockets[t].s, sockets[t].ev, &what ) != SOCKET_ERROR ) {
|
| 1363 |
|
|
if( what.lNetworkEvents & FD_CONNECT ) {
|
| 1364 |
|
|
if( what.iErrorCode[FD_CONNECT_BIT] == 0 ) {
|
| 1365 |
|
|
D(bug("<%d> Connect ok\r\n", t));
|
| 1366 |
|
|
tcp_connect_callback(t);
|
| 1367 |
|
|
} else {
|
| 1368 |
|
|
D(bug("<%d> Connect error=%d\r\n", t, what.iErrorCode[FD_CONNECT_BIT]));
|
| 1369 |
|
|
// Post icmp error
|
| 1370 |
|
|
}
|
| 1371 |
|
|
} else if( what.lNetworkEvents & FD_CLOSE ) {
|
| 1372 |
|
|
if( what.iErrorCode[FD_CLOSE_BIT] == 0 ) {
|
| 1373 |
|
|
D(bug("<%d> graceful close, state = %s\r\n", t, STATENAME(sockets[t].state)));
|
| 1374 |
|
|
} else {
|
| 1375 |
|
|
D(bug("<%d> abortive close, state = %s, code=%d\r\n", t, STATENAME(sockets[t].state), what.iErrorCode[FD_CLOSE_BIT]));
|
| 1376 |
|
|
}
|
| 1377 |
|
|
sockets[t].remote_closed = true;
|
| 1378 |
|
|
}
|
| 1379 |
|
|
} else {
|
| 1380 |
|
|
int err = _WSAGetLastError();
|
| 1381 |
|
|
if( err == WSAENOTSOCK ) {
|
| 1382 |
|
|
D(bug("<%d> WSAEnumNetworkEvents: socket is already closed\r\n", t));
|
| 1383 |
|
|
} else {
|
| 1384 |
|
|
D(bug("<%d> WSAEnumNetworkEvents failed with error code %d, freeing slot\r\n", t, err));
|
| 1385 |
|
|
free_socket( t );
|
| 1386 |
|
|
}
|
| 1387 |
|
|
}
|
| 1388 |
|
|
}
|
| 1389 |
|
|
_WSAResetEvent( sockets[t].ev );
|
| 1390 |
|
|
} else {
|
| 1391 |
|
|
static int interval = 5;
|
| 1392 |
|
|
if( !--interval ) {
|
| 1393 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 1394 |
|
|
if(sockets[i].in_use) {
|
| 1395 |
|
|
DWORD tmw = sockets[i].time_wait;
|
| 1396 |
|
|
DWORD stl = sockets[i].stream_to_mac_stalled_until;
|
| 1397 |
|
|
if( tmw ) {
|
| 1398 |
|
|
if( GetTickCount() >= tmw ) {
|
| 1399 |
|
|
if( sockets[i].state == SYN_SENT ) {
|
| 1400 |
|
|
/*
|
| 1401 |
|
|
A very basic SYN flood protection. Note that watching
|
| 1402 |
|
|
SYN_SENT instead of SYN_RCVD, because the state codes are
|
| 1403 |
|
|
from the point of view of the Mac-Router interface, not Router-Remote.
|
| 1404 |
|
|
*/
|
| 1405 |
|
|
D(bug("<%d> SYN_SENT time-out expired\r\n", i));
|
| 1406 |
|
|
} else {
|
| 1407 |
|
|
D(bug("<%d> TIME_WAIT expired\r\n", i));
|
| 1408 |
|
|
}
|
| 1409 |
|
|
free_socket( i );
|
| 1410 |
|
|
}
|
| 1411 |
|
|
} else if( stl ) {
|
| 1412 |
|
|
if( sockets[i].state == ESTABLISHED ) {
|
| 1413 |
|
|
if( GetTickCount() >= stl ) {
|
| 1414 |
|
|
D(bug("<%d> RESEND timeout expired\r\n", i));
|
| 1415 |
|
|
sockets[i].stream_to_mac_stalled_until = GetTickCount() + sockets[i].resend_timeout;
|
| 1416 |
|
|
send_buffer( i, true );
|
| 1417 |
|
|
}
|
| 1418 |
|
|
} else {
|
| 1419 |
|
|
sockets[i].stream_to_mac_stalled_until = 0;
|
| 1420 |
|
|
}
|
| 1421 |
|
|
}
|
| 1422 |
|
|
}
|
| 1423 |
|
|
}
|
| 1424 |
|
|
interval = 5;
|
| 1425 |
|
|
}
|
| 1426 |
|
|
}
|
| 1427 |
|
|
LeaveCriticalSection( &tcp_section );
|
| 1428 |
|
|
}
|
| 1429 |
|
|
return 0;
|
| 1430 |
|
|
}
|
| 1431 |
|
|
|
| 1432 |
|
|
static WINAPI unsigned int tcp_listen_thread(void *arg)
|
| 1433 |
|
|
{
|
| 1434 |
|
|
WSAEVENT wait_handles[MAX_SOCKETS];
|
| 1435 |
|
|
|
| 1436 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 1437 |
|
|
wait_handles[i] = l_sockets[i].ev;
|
| 1438 |
|
|
tcp_start_listen( i );
|
| 1439 |
|
|
}
|
| 1440 |
|
|
|
| 1441 |
|
|
while(!is_router_shutting_down) {
|
| 1442 |
|
|
DWORD ret = WaitForMultipleObjects(
|
| 1443 |
|
|
MAX_SOCKETS,
|
| 1444 |
|
|
wait_handles,
|
| 1445 |
|
|
FALSE,
|
| 1446 |
|
|
200
|
| 1447 |
|
|
);
|
| 1448 |
|
|
|
| 1449 |
|
|
if(is_router_shutting_down) break;
|
| 1450 |
|
|
|
| 1451 |
|
|
EnterCriticalSection( &tcp_section );
|
| 1452 |
|
|
if( ret >= WAIT_OBJECT_0 && ret < WAIT_OBJECT_0 + MAX_SOCKETS ) {
|
| 1453 |
|
|
const int lst = ret - WAIT_OBJECT_0;
|
| 1454 |
|
|
|
| 1455 |
|
|
D(bug("[%d] connection attempt to port %d\r\n", lst, l_sockets[lst].port));
|
| 1456 |
|
|
|
| 1457 |
|
|
WSANETWORKEVENTS what;
|
| 1458 |
|
|
|
| 1459 |
|
|
if( _WSAEnumNetworkEvents( l_sockets[lst].s, l_sockets[lst].ev, &what ) != SOCKET_ERROR ) {
|
| 1460 |
|
|
if( what.lNetworkEvents & FD_ACCEPT ) {
|
| 1461 |
|
|
if( what.iErrorCode[FD_ACCEPT_BIT] == 0 ) {
|
| 1462 |
|
|
D(bug("[%d] Connect ok\r\n", lst));
|
| 1463 |
|
|
tcp_accept_callback(lst);
|
| 1464 |
|
|
} else {
|
| 1465 |
|
|
D(bug("[%d] Connect error=%d\r\n", lst, what.iErrorCode[FD_ACCEPT_BIT]));
|
| 1466 |
|
|
// Post icmp error
|
| 1467 |
|
|
}
|
| 1468 |
|
|
}
|
| 1469 |
|
|
}
|
| 1470 |
|
|
|
| 1471 |
|
|
// close on errors too
|
| 1472 |
|
|
if(l_sockets[lst].once) {
|
| 1473 |
|
|
D(bug("[%d] once mode: closing listening socket on port %d\r\n", lst, l_sockets[lst].port));
|
| 1474 |
|
|
if( _closesocket( l_sockets[lst].s ) == SOCKET_ERROR ) {
|
| 1475 |
|
|
int err = _WSAGetLastError();
|
| 1476 |
|
|
D(bug("[%d] close error %d\r\n", lst, err));
|
| 1477 |
|
|
}
|
| 1478 |
|
|
|
| 1479 |
|
|
l_sockets[lst].s = INVALID_SOCKET;
|
| 1480 |
|
|
l_sockets[lst].port = 0;
|
| 1481 |
|
|
l_sockets[lst].ip = 0;
|
| 1482 |
|
|
|
| 1483 |
|
|
int t = l_sockets[lst].parent;
|
| 1484 |
|
|
if( t >= 0 ) {
|
| 1485 |
|
|
sockets[t].child = -1;
|
| 1486 |
|
|
}
|
| 1487 |
|
|
l_sockets[lst].parent = -1;
|
| 1488 |
|
|
}
|
| 1489 |
|
|
|
| 1490 |
|
|
_WSAResetEvent( l_sockets[lst].ev );
|
| 1491 |
|
|
}
|
| 1492 |
|
|
LeaveCriticalSection( &tcp_section );
|
| 1493 |
|
|
}
|
| 1494 |
|
|
return 0;
|
| 1495 |
|
|
}
|
| 1496 |
|
|
|
| 1497 |
|
|
/*
|
| 1498 |
|
|
tcp_port=<port> [,<interface to bind>]
|
| 1499 |
|
|
tcp_port=21,192.168.0.1
|
| 1500 |
|
|
*/
|
| 1501 |
|
|
|
| 1502 |
|
|
static void init_tcp_listen_ports()
|
| 1503 |
|
|
{
|
| 1504 |
|
|
int32 index = 0;
|
| 1505 |
|
|
const char *port_str;
|
| 1506 |
|
|
while ((port_str = PrefsFindString("tcp_port", index++)) != NULL) {
|
| 1507 |
|
|
uint32 iface = 0;
|
| 1508 |
|
|
char *if_str = strchr(port_str,',');
|
| 1509 |
|
|
if(if_str) {
|
| 1510 |
|
|
*if_str++ = 0;
|
| 1511 |
|
|
uint32 if_net = _inet_addr( if_str );
|
| 1512 |
|
|
if(if_net == INADDR_NONE) if_net = INADDR_ANY;
|
| 1513 |
|
|
iface = ntohl( if_net );
|
| 1514 |
|
|
}
|
| 1515 |
|
|
uint16 port = (uint16)strtoul( port_str, 0, 0 );
|
| 1516 |
|
|
if( port ) {
|
| 1517 |
|
|
uint32 ip = 0;
|
| 1518 |
|
|
bool once = false;
|
| 1519 |
|
|
alloc_listen_socket( port, ip, iface, once );
|
| 1520 |
|
|
}
|
| 1521 |
|
|
}
|
| 1522 |
|
|
}
|
| 1523 |
|
|
|
| 1524 |
|
|
static HANDLE tcp_handle = 0;
|
| 1525 |
|
|
static HANDLE tcp_l_handle = 0;
|
| 1526 |
|
|
|
| 1527 |
|
|
void init_tcp()
|
| 1528 |
|
|
{
|
| 1529 |
|
|
InitializeCriticalSection( &tcp_section );
|
| 1530 |
|
|
|
| 1531 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 1532 |
|
|
memset( &sockets[i], 0, sizeof(tcp_socket_t) );
|
| 1533 |
|
|
sockets[i].s = INVALID_SOCKET;
|
| 1534 |
|
|
sockets[i].state = CLOSED;
|
| 1535 |
|
|
sockets[i].ev = _WSACreateEvent();
|
| 1536 |
|
|
sockets[i].child = -1;
|
| 1537 |
|
|
}
|
| 1538 |
|
|
|
| 1539 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 1540 |
|
|
memset( &l_sockets[i], 0, sizeof(tcp_listening_socket_t) );
|
| 1541 |
|
|
l_sockets[i].s = INVALID_SOCKET;
|
| 1542 |
|
|
l_sockets[i].ev = _WSACreateEvent();
|
| 1543 |
|
|
l_sockets[i].parent = -1;
|
| 1544 |
|
|
/*
|
| 1545 |
|
|
l_sockets[i].port = 0;
|
| 1546 |
|
|
l_sockets[i].ip = 0;
|
| 1547 |
|
|
l_sockets[i].iface = 0;
|
| 1548 |
|
|
l_sockets[i].once = false;
|
| 1549 |
|
|
*/
|
| 1550 |
|
|
}
|
| 1551 |
|
|
|
| 1552 |
|
|
init_tcp_listen_ports();
|
| 1553 |
|
|
|
| 1554 |
|
|
unsigned int tcp_tid;
|
| 1555 |
|
|
tcp_handle = (HANDLE)_beginthreadex( 0, 0, tcp_connect_close_thread, 0, 0, &tcp_tid );
|
| 1556 |
|
|
|
| 1557 |
|
|
unsigned int tcp_l_tid;
|
| 1558 |
|
|
tcp_l_handle = (HANDLE)_beginthreadex( 0, 0, tcp_listen_thread, 0, 0, &tcp_l_tid );
|
| 1559 |
|
|
}
|
| 1560 |
|
|
|
| 1561 |
|
|
void final_tcp()
|
| 1562 |
|
|
{
|
| 1563 |
|
|
D(bug("closing all tcp sockets\r\n"));
|
| 1564 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 1565 |
|
|
if(sockets[i].s != INVALID_SOCKET) {
|
| 1566 |
|
|
D(bug(" closing socket %d\r\n", i));
|
| 1567 |
|
|
}
|
| 1568 |
|
|
free_socket( i );
|
| 1569 |
|
|
if(sockets[i].buffers_write[0].buf) {
|
| 1570 |
|
|
delete [] sockets[i].buffers_write[0].buf;
|
| 1571 |
|
|
sockets[i].buffers_write[0].buf = 0;
|
| 1572 |
|
|
}
|
| 1573 |
|
|
if(sockets[i].buffers_read[0].buf) {
|
| 1574 |
|
|
delete [] sockets[i].buffers_read[0].buf;
|
| 1575 |
|
|
sockets[i].buffers_read[0].buf = 0;
|
| 1576 |
|
|
}
|
| 1577 |
|
|
}
|
| 1578 |
|
|
|
| 1579 |
|
|
D(bug("closing all tcp listening socket\r\n"));
|
| 1580 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 1581 |
|
|
if(l_sockets[i].s != INVALID_SOCKET) {
|
| 1582 |
|
|
D(bug(" closing listening socket %d\r\n", i));
|
| 1583 |
|
|
_closesocket( l_sockets[i].s );
|
| 1584 |
|
|
l_sockets[i].s = INVALID_SOCKET;
|
| 1585 |
|
|
}
|
| 1586 |
|
|
}
|
| 1587 |
|
|
|
| 1588 |
|
|
// The router module has already set the shutdown flag.
|
| 1589 |
|
|
WaitForSingleObject( tcp_handle, INFINITE );
|
| 1590 |
|
|
WaitForSingleObject( tcp_l_handle, INFINITE );
|
| 1591 |
|
|
|
| 1592 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 1593 |
|
|
if(sockets[i].ev != WSA_INVALID_EVENT) {
|
| 1594 |
|
|
_WSACloseEvent(sockets[i].ev);
|
| 1595 |
|
|
sockets[i].ev = WSA_INVALID_EVENT;
|
| 1596 |
|
|
}
|
| 1597 |
|
|
}
|
| 1598 |
|
|
for( int i=0; i<MAX_SOCKETS; i++ ) {
|
| 1599 |
|
|
if(l_sockets[i].ev != WSA_INVALID_EVENT) {
|
| 1600 |
|
|
_WSACloseEvent(l_sockets[i].ev);
|
| 1601 |
|
|
l_sockets[i].ev = WSA_INVALID_EVENT;
|
| 1602 |
|
|
}
|
| 1603 |
|
|
}
|
| 1604 |
|
|
|
| 1605 |
|
|
DeleteCriticalSection( &tcp_section );
|
| 1606 |
|
|
}
|
