Tap

Files
file	tap.h

Functions
moep_dev_t	moep_dev_tap_open (u8 *addr, const struct in_addr *ip, int prefixlen, int mtu, struct moep_frame_ops *l2_ops)
	open a tap device More...
int	moep_dev_tap_get_hwaddr (moep_dev_t dev, u8 *addr)
	get hardware address More...
moep_frame_t	moep_frame_tap_create (struct moep_frame_ops *l2_ops)
	create a tap frame More...

Detailed Description

Function Documentation

moep_dev_t moep_dev_tap_open	(	u8 *	addr,
		const struct in_addr *	ip,
		int	prefixlen,
		int	mtu,
		struct moep_frame_ops *	l2_ops
	)

open a tap device

The function moep_dev_tap_open() is used to open a tap device.

Parameters

addr	the hardware address of the device; This can be NULL to be automatically set.
ip	the IP address of the device; This can be NULL to set no IP address.
prefixlen	the length of the IP prefix.
mtu	the MTU of the device; This includes all headers.
l2_ops	frame header operations for layer 2

Returns

This function returns a moep device.

Return values

NULL	on error, errno is set appropriately.

Errors

These are some standard errors generated and returned by this function. Additional errors may be generated and returned from the underlying system calls.

EINVAL	Invalid argument
EMFILE	Too many open files; Some filedescriptors are too big for select.
ENOMEM	Not enough memory available

int moep_dev_tap_get_hwaddr	(	moep_dev_t	dev,
		u8 *	addr
	)

get hardware address

The function moep_dev_tap_get_hwaddr() is used to get the hardware address of a tap device.

Parameters

dev	the tap device
addr	a buffer for the address

Return values

0	on success
-1	on error, errno is set appropriately.

Errors

These are some standard errors generated and returned by this function. Additional errors may be generated and returned from the underlying system calls.

EACCES

The moep device is not a tap device.

moep_frame_t moep_frame_tap_create

(

struct moep_frame_ops *

l2_ops

)

create a tap frame

The function moep_frame_tap_create() is used to create a tap frame with the given frame header operations for layer 2.

Parameters

l2_ops

frame header operations for layer 2

Returns

This function returns a moep frame.

Return values

NULL	on error, errno is set appropriately.

Errors

The error values are the same as for moep_frame_create().