README
¶
netstack
Custom network stack in Go
This networkstack implements (very) basic and rudimentary support for connecting tcp streams. There needs to be a lot to be implemented and optimised.
Projects
Currently netstack is being used by the following projects:
Configuration
Linux will send RST packets for unknown tcp packets, so this needs to be disabled using iptables.
iptables -A OUTPUT -p tcp --tcp-flags RST RST -j DROP
iptables -I OUTPUT -p icmp --icmp-type destination-unreachable -j DROP
Samples
See samples folder.
References
- http://backreference.org/2010/03/26/tuntap-interface-tutorial/
- http://stackoverflow.com/questions/3062205/setting-the-source-ip-for-a-udp-socket
- http://stackoverflow.com/questions/12177708/raw-socket-promiscuous-mode-not-sniffing-what-i-write
- http://stackoverflow.com/questions/110341/tcp-handshake-with-sock-raw-socket
- http://devdungeon.com/content/packet-capture-injection-and-analysis-gopacket
- https://en.wikipedia.org/wiki/Transmission_Control_Protocol#/media/File:Tcp_state_diagram_fixed_new.svg
- https://github.com/mindreframer/golang-stuff/blob/master/github.com/pebbe/zmq2/examples/udpping1.go
- https://github.com/adamdunkels/uip/blob/master/uip/uip.c
- http://www.darkcoding.net/uncategorized/raw-sockets-in-go-ip-layer/
- http://lxr.free-electrons.com/source/net/ipv4/tcp.c
- https://www.freebsd.org/doc/en/books/developers-handbook/sockets-essential-functions.html
- http://stackoverflow.com/questions/8047728/how-to-set-linux-kernel-not-to-send-rst-ack-so-that-i-can-give-syn-ack-within-r
Documentation
¶
Index ¶
- Constants
- Variables
- type Connection
- func (c *Connection) Close() error
- func (c *Connection) LocalAddr() net.Addr
- func (c *Connection) Open(src net.IP, dst net.IP, port int) error
- func (conn *Connection) Read(b []byte) (n int, err error)
- func (c *Connection) Receive() chan []byte
- func (c *Connection) RemoteAddr() net.Addr
- func (c *Connection) SetDeadline(t time.Time) error
- func (c *Connection) SetReadDeadline(t time.Time) error
- func (c *Connection) SetWriteDeadline(t time.Time) error
- func (c *Connection) Write(b []byte) (n int, err error)
- type SocketState
- type Stack
- type State
- type StateTable
Constants ¶
const ( MaxEpollEvents = 64 DefaultBufferSize = 65535 )
Variables ¶
var ErrNoState = errors.New("No state for packet.")
Functions ¶
This section is empty.
Types ¶
type Connection ¶
type Connection struct {
Connected chan bool
Src, Dst net.IP
SourcePort, DestinationPort uint16
Recv chan []byte
Stack *Stack
// contains filtered or unexported fields
}
func (*Connection) Close ¶
func (c *Connection) Close() error
Close closes the connection. Any blocked Read or Write operations will be unblocked and return errors.
func (*Connection) LocalAddr ¶
func (c *Connection) LocalAddr() net.Addr
LocalAddr returns the local network address.
func (*Connection) Read ¶
func (conn *Connection) Read(b []byte) (n int, err error)
Read reads data from the connection. Read can be made to time out and return a Error with Timeout() == true after a fixed time limit; see SetDeadline and SetReadDeadline.
func (*Connection) Receive ¶
func (c *Connection) Receive() chan []byte
func (*Connection) RemoteAddr ¶
func (c *Connection) RemoteAddr() net.Addr
RemoteAddr returns the remote network address.
func (*Connection) SetDeadline ¶
func (c *Connection) SetDeadline(t time.Time) error
SetDeadline sets the read and write deadlines associated with the connection. It is equivalent to calling both SetReadDeadline and SetWriteDeadline.
A deadline is an absolute time after which I/O operations fail with a timeout (see type Error) instead of blocking. The deadline applies to all future I/O, not just the immediately following call to Read or Write.
An idle timeout can be implemented by repeatedly extending the deadline after successful Read or Write calls.
A zero value for t means I/O operations will not time out.
func (*Connection) SetReadDeadline ¶
func (c *Connection) SetReadDeadline(t time.Time) error
SetReadDeadline sets the deadline for future Read calls. A zero value for t means Read will not time out.
func (*Connection) SetWriteDeadline ¶
func (c *Connection) SetWriteDeadline(t time.Time) error
SetWriteDeadline sets the deadline for future Write calls. Even if write times out, it may return n > 0, indicating that some of the data was successfully written. A zero value for t means Write will not time out.
type SocketState ¶
type SocketState int
const ( SocketClosed SocketState = iota SocketListen SocketSynReceived SocketSynSent SocketEstablished SocketFinWait1 SocketFinWait2 SocketClosing SocketTimeWait SocketCloseWait SocketLastAck )
func (SocketState) String ¶
func (ss SocketState) String() string
type StateTable ¶
type StateTable []*State
func (*StateTable) Add ¶
func (st *StateTable) Add(state *State)
Source Files
Directories
