iftable.c File Reference

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <assert.h>
#include <linux/netdevice.h>
#include <libnfnetlink/libnfnetlink.h>
#include "rtnl.h"
#include "linux_list.h"

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Data Structures
struct	ifindex_node
struct	nlif_handle

Functions
int	nlif_index2name (struct nlif_handle *h, unsigned int index, char *name)
	Get the name for an ifindex. More...
int	nlif_get_ifflags (const struct nlif_handle *h, unsigned int index, unsigned int *flags)
	Get the flags for an ifindex. More...
struct nlif_handle *	nlif_open (void)
	Initialize interface table. More...
void	nlif_close (struct nlif_handle *h)
	Destructor of interface table. More...
int	nlif_catch (struct nlif_handle *h)
	Receive message from netlink and update interface table. More...
int	nlif_query (struct nlif_handle *h)
	nlif_query - request a dump of interfaces available in the system : pointer to a valid nlif_handler More...
int	nlif_fd (struct nlif_handle *h)
	Returns socket descriptor for the netlink socket. More...

Function Documentation

int nlif_catch

(

struct nlif_handle *

h

)

Receive message from netlink and update interface table.

Parameters

nlif_handle

A pointer to a nlif_handle created

Returns

0 if OK

References NULL, nlif_handle::rtnl_handle, and rtnl_receive().

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void nlif_close

(

struct nlif_handle *

h

)

Destructor of interface table.

Parameters

nlif_handle

A pointer to a nlif_handle created via nlif_open()

References ifindex_node::head, nlif_handle::ifadd_handler, nlif_handle::ifdel_handler, nlif_handle::ifindex_hash, list_for_each_entry_safe, NULL, rtnl_close(), nlif_handle::rtnl_handle, and rtnl_handler_unregister().

Referenced by main().

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int nlif_fd

(

struct nlif_handle *

h

)

Returns socket descriptor for the netlink socket.

Parameters

nlif_handle

A pointer to a nlif_handle created

Returns

The fd or -1 if there's an error

References NULL, rtnl_handle::rtnl_fd, and nlif_handle::rtnl_handle.

Referenced by nl_init_interface_handler().

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int nlif_get_ifflags	(	const struct nlif_handle *	h,
		unsigned int	index,
		unsigned int *	flags
	)

Get the flags for an ifindex.

Parameters

nlif_handle	A pointer to a nlif_handle created
index	ifindex to be resolved
flags	pointer to variable used to store the interface flags

Returns

-1 on error, 1 on success

References flags, ifindex_node::head, nlif_handle::ifindex_hash, list_for_each_entry, and NULL.

Referenced by main().

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int nlif_index2name	(	struct nlif_handle *	h,
		unsigned int	index,
		char *	name
	)

Get the name for an ifindex.

Parameters

nlif_handle	A pointer to a nlif_handle created
index	ifindex to be resolved
name	interface name, pass a buffer of IFNAMSIZ size

Returns

-1 on error, 1 on success

References ifindex_node::head, nlif_handle::ifindex_hash, list_for_each_entry, and NULL.

Referenced by main(), nfq_get_indev_name(), nfq_get_outdev_name(), nfq_get_physindev_name(), and nfq_get_physoutdev_name().

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struct nlif_handle* nlif_open

(

void

)

Initialize interface table.

Initialize rtnl interface and interface table Call this before any nlif_* function

Returns

file descriptor to netlink socket

References rtnl_handler::arg, rtnl_handler::handlefn, nlif_handle::ifadd_handler, nlif_handle::ifdel_handler, nlif_handle::ifindex_hash, INIT_LIST_HEAD, rtnl_handler::nlmsg_type, NULL, RTM_DELLINK, RTM_NEWLINK, rtnl_close(), nlif_handle::rtnl_handle, rtnl_handler_register(), rtnl_handler_unregister(), and rtnl_open().

Referenced by main(), and nl_init_interface_handler().

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int nlif_query

(

struct nlif_handle *

h

)

nlif_query - request a dump of interfaces available in the system : pointer to a valid nlif_handler

References NULL, RTM_GETLINK, rtnl_dump_type(), and nlif_handle::rtnl_handle.

Referenced by main(), and nl_init_interface_handler().

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