Functions
struct nfulnl_msg_packet_hdr *	nflog_get_msg_packet_hdr (struct nflog_data *nfad)
	nflog_get_msg_packet_hdr - return the metaheader that wraps the packet More...

u_int16_t	nflog_get_hwtype (struct nflog_data *nfad)
	nflog_get_hwtype - get the hardware link layer type from logging data More...

u_int16_t	nflog_get_msg_packet_hwhdrlen (struct nflog_data *nfad)
	nflog_get_hwhdrlen - get the length of the hardware link layer header More...

char *	nflog_get_msg_packet_hwhdr (struct nflog_data *nfad)
	nflog_get_msg_packet_hwhdr - get the hardware link layer header More...

u_int32_t	nflog_get_nfmark (struct nflog_data *nfad)
	nflog_get_nfmark - get the packet mark More...

int	nflog_get_timestamp (struct nflog_data nfad, struct timeval tv)
	nflog_get_timestamp - get the packet timestamp More...

u_int32_t	nflog_get_indev (struct nflog_data *nfad)
	nflog_get_indev - get the interface that the packet was received through More...

u_int32_t	nflog_get_physindev (struct nflog_data *nfad)
	nflog_get_physindev - get the physical interface that the packet was received More...

u_int32_t	nflog_get_outdev (struct nflog_data *nfad)
	nflog_get_outdev - gets the interface that the packet will be routed out More...

u_int32_t	nflog_get_physoutdev (struct nflog_data *nfad)
	nflog_get_physoutdev - get the physical interface that the packet output More...

struct nfulnl_msg_packet_hw *	nflog_get_packet_hw (struct nflog_data *nfad)
	nflog_get_packet_hw - get hardware address More...

int	nflog_get_payload (struct nflog_data nfad, char *data)
	nflog_get_payload - get payload of the logged packet More...

char *	nflog_get_prefix (struct nflog_data *nfad)
	nflog_get_prefix - get the logging string prefix More...

int	nflog_get_uid (struct nflog_data nfad, u_int32_t uid)
	nflog_get_uid - get the UID of the user that has generated the packet More...

int	nflog_get_gid (struct nflog_data nfad, u_int32_t gid)
	nflog_get_gid - get the GID of the user that has generated the packet More...

int	nflog_get_seq (struct nflog_data nfad, u_int32_t seq)
	nflog_get_seq - get the local nflog sequence number More...

int	nflog_get_seq_global (struct nflog_data nfad, u_int32_t seq)
	nflog_get_seq_global - get the global nflog sequence number More...

struct nfqnl_msg_packet_hdr *	nfq_get_msg_packet_hdr (struct nfq_data *nfad)
	nfqnl_msg_packet_hdr - return the metaheader that wraps the packet More...

	EXPORT_SYMBOL (nfq_get_msg_packet_hdr)

uint32_t	nfq_get_nfmark (struct nfq_data *nfad)
	nfq_get_nfmark - get the packet mark More...

	EXPORT_SYMBOL (nfq_get_nfmark)

int	nfq_get_timestamp (struct nfq_data nfad, struct timeval tv)
	nfq_get_timestamp - get the packet timestamp More...

	EXPORT_SYMBOL (nfq_get_timestamp)

u_int32_t	nfq_get_indev (struct nfq_data *nfad)
	nfq_get_indev - get the interface that the packet was received through More...

	EXPORT_SYMBOL (nfq_get_indev)

u_int32_t	nfq_get_physindev (struct nfq_data *nfad)
	nfq_get_physindev - get the physical interface that the packet was received More...

	EXPORT_SYMBOL (nfq_get_physindev)

u_int32_t	nfq_get_outdev (struct nfq_data *nfad)
	nfq_get_outdev - gets the interface that the packet will be routed out More...

	EXPORT_SYMBOL (nfq_get_outdev)

u_int32_t	nfq_get_physoutdev (struct nfq_data *nfad)
	nfq_get_physoutdev - get the physical interface that the packet output More...

	EXPORT_SYMBOL (nfq_get_physoutdev)

int	nfq_get_indev_name (struct nlif_handle nlif_handle, struct nfq_data nfad, char *name)
	nfq_get_indev_name - get the name of the interface the packet was received through More...

	EXPORT_SYMBOL (nfq_get_indev_name)

int	nfq_get_physindev_name (struct nlif_handle nlif_handle, struct nfq_data nfad, char *name)
	nfq_get_physindev_name - get the name of the physical interface the packet was received through More...

	EXPORT_SYMBOL (nfq_get_physindev_name)

int	nfq_get_outdev_name (struct nlif_handle nlif_handle, struct nfq_data nfad, char *name)
	nfq_get_outdev_name - get the name of the physical interface the packet will be sent to More...

	EXPORT_SYMBOL (nfq_get_outdev_name)

int	nfq_get_physoutdev_name (struct nlif_handle nlif_handle, struct nfq_data nfad, char *name)
	nfq_get_physoutdev_name - get the name of the interface the packet will be sent to More...

	EXPORT_SYMBOL (nfq_get_physoutdev_name)

struct nfqnl_msg_packet_hw *	nfq_get_packet_hw (struct nfq_data *nfad)
	nfq_get_packet_hw More...

	EXPORT_SYMBOL (nfq_get_packet_hw)

int	nfq_get_uid (struct nfq_data nfad, u_int32_t uid)
	nfq_get_uid - get the UID of the user the packet belongs to More...

	EXPORT_SYMBOL (nfq_get_uid)

int	nfq_get_gid (struct nfq_data nfad, u_int32_t gid)
	nfq_get_gid - get the GID of the user the packet belongs to More...

	EXPORT_SYMBOL (nfq_get_gid)

int	nfq_get_payload (struct nfq_data nfad, unsigned char *data)
	nfq_get_payload - get payload More...

	EXPORT_SYMBOL (nfq_get_payload)

Detailed Description

Function Documentation

EXPORT_SYMBOL ( nfq_get_msg_packet_hdr )

EXPORT_SYMBOL ( nfq_get_nfmark )

EXPORT_SYMBOL ( nfq_get_timestamp )

EXPORT_SYMBOL ( nfq_get_indev )

EXPORT_SYMBOL ( nfq_get_physindev )

EXPORT_SYMBOL ( nfq_get_outdev )

EXPORT_SYMBOL ( nfq_get_physoutdev )

EXPORT_SYMBOL ( nfq_get_indev_name )

EXPORT_SYMBOL ( nfq_get_physindev_name )

EXPORT_SYMBOL ( nfq_get_outdev_name )

EXPORT_SYMBOL ( nfq_get_physoutdev_name )

EXPORT_SYMBOL ( nfq_get_packet_hw )

EXPORT_SYMBOL ( nfq_get_uid )

EXPORT_SYMBOL ( nfq_get_gid )

EXPORT_SYMBOL ( nfq_get_payload )

int nflog_get_gid	(	struct nflog_data *	nfad,
		u_int32_t *	gid
	)

nflog_get_gid - get the GID of the user that has generated the packet

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: the GID of the user that has genered the packet, if any.

References nflog_data::nfa, nfnl_attr_present, nfnl_get_data, and NFULA_GID.

u_int16_t nflog_get_hwtype ( struct nflog_data * nfad )

nflog_get_hwtype - get the hardware link layer type from logging data

Parameters

nfad	pointer to logging data

Returns: the hardware link layer type.

References nflog_data::nfa, nfnl_get_data, and NFULA_HWTYPE.

u_int32_t nflog_get_indev ( struct nflog_data * nfad )

nflog_get_indev - get the interface that the packet was received through

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: The index of the device the packet was received via. If the returned index is 0, the packet was locally generated or the input interface is not known (ie. POSTROUTING?).

Warning: all nflog_get_dev() functions return 0 if not set, since linux only allows ifindex >= 1, see net/core/dev.c:2600 (in 2.6.13.1)

References nflog_data::nfa, nfnl_get_data, and NFULA_IFINDEX_INDEV.

Referenced by nflog_snprintf_xml().

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struct nfulnl_msg_packet_hdr* nflog_get_msg_packet_hdr ( struct nflog_data * nfad )

nflog_get_msg_packet_hdr - return the metaheader that wraps the packet

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: the netfilter log netlink packet header for the given nflog_data argument. Typically, the nflog_data value is passed as the 3rd parameter to the callback function set by a call to nflog_callback_register().

The nfulnl_msg_packet_hdr structure is defined in libnetfilter_log.h as:

    struct nfulnl_msg_packet_hdr {
            u_int16_t       hw_protocol;    // hw protocol (network order)
            u_int8_t        hook;           // netfilter hook
        u_int8_t        _pad;
    } __attribute__ ((packed));

References nflog_data::nfa, nfnl_get_pointer_to_data, and NFULA_PACKET_HDR.

Referenced by nflog_snprintf_xml().

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char* nflog_get_msg_packet_hwhdr ( struct nflog_data * nfad )

nflog_get_msg_packet_hwhdr - get the hardware link layer header

Parameters

nfad	pointer to logging data

Returns: the hardware link layer header

References nflog_data::nfa, nfnl_get_pointer_to_data, and NFULA_HWHEADER.

u_int16_t nflog_get_msg_packet_hwhdrlen ( struct nflog_data * nfad )

nflog_get_hwhdrlen - get the length of the hardware link layer header

Parameters

nfad	pointer to logging data

Returns: the size of the hardware link layer header

References nflog_data::nfa, nfnl_get_data, and NFULA_HWLEN.

u_int32_t nflog_get_nfmark ( struct nflog_data * nfad )

nflog_get_nfmark - get the packet mark

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: the netfilter mark currently assigned to the logged packet.

References nflog_data::nfa, nfnl_get_data, and NFULA_MARK.

Referenced by nflog_snprintf_xml().

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u_int32_t nflog_get_outdev ( struct nflog_data * nfad )

nflog_get_outdev - gets the interface that the packet will be routed out

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: The index of the device the packet will be sent out. If the returned index is 0, the packet is destined for localhost or the output interface is not yet known (ie. PREROUTING?).

References nflog_data::nfa, nfnl_get_data, and NFULA_IFINDEX_OUTDEV.

Referenced by nflog_snprintf_xml().

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struct nfulnl_msg_packet_hw* nflog_get_packet_hw ( struct nflog_data * nfad )

nflog_get_packet_hw - get hardware address

Parameters

nfad	Netlink packet data handle passed to callback function

Retrieves the hardware address associated with the given packet. For ethernet packets, the hardware address returned (if any) will be the MAC address of the packet source host. The destination MAC address is not known until after POSTROUTING and a successful ARP request, so cannot currently be retrieved.

The nfulnl_msg_packet_hw structure is defined in libnetfilter_log.h as:

        struct nfulnl_msg_packet_hw {
                u_int16_t       hw_addrlen;
                u_int16_t       _pad;
                u_int8_t        hw_addr[8];
        } __attribute__ ((packed));

References nflog_data::nfa, nfnl_get_pointer_to_data, and NFULA_HWADDR.

Referenced by nflog_snprintf_xml().

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int nflog_get_payload	(	struct nflog_data *	nfad,
		char **	data
	)

nflog_get_payload - get payload of the logged packet

Parameters

nfad	Netlink packet data handle passed to callback function
data	Pointer of pointer that will be pointed to the payload

Retrieve the payload for a logged packet. The actual amount and type of data retrieved by this function will depend on the mode set with the nflog_set_mode() function.

Returns: -1 on error, otherwise > 0.

References nflog_data::nfa, NFA_PAYLOAD, nfnl_get_pointer_to_data, and NFULA_PAYLOAD.

Referenced by nflog_snprintf_xml().

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u_int32_t nflog_get_physindev ( struct nflog_data * nfad )

nflog_get_physindev - get the physical interface that the packet was received

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: The index of the physical device the packet was received via. If the returned index is 0, the packet was locally generated or the physical input interface is no longer known (ie. POSTROUTING?).

References nflog_data::nfa, nfnl_get_data, and NFULA_IFINDEX_PHYSINDEV.

Referenced by nflog_snprintf_xml().

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u_int32_t nflog_get_physoutdev ( struct nflog_data * nfad )

nflog_get_physoutdev - get the physical interface that the packet output

Parameters

nfad	Netlink packet data handle passed to callback function

The index of the physical device the packet will be sent out. If the returned index is 0, the packet is destined for localhost or the physical output interface is not yet known (ie. PREROUTING?).

Returns: The index of physical interface that the packet output will be routed out.

References nflog_data::nfa, nfnl_get_data, and NFULA_IFINDEX_PHYSOUTDEV.

Referenced by nflog_snprintf_xml().

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char* nflog_get_prefix ( struct nflog_data * nfad )

nflog_get_prefix - get the logging string prefix

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: the string prefix that is specified as argument to the iptables' NFLOG target.

References nflog_data::nfa, nfnl_get_pointer_to_data, and NFULA_PREFIX.

Referenced by nflog_snprintf_xml().

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int nflog_get_seq	(	struct nflog_data *	nfad,
		u_int32_t *	seq
	)

nflog_get_seq - get the local nflog sequence number

Parameters

nfad	Netlink packet data handle passed to callback function

You must enable this via nflog_set_flags().

Returns: the local nflog sequence number.

References nflog_data::nfa, nfnl_attr_present, nfnl_get_data, and NFULA_SEQ.

int nflog_get_seq_global	(	struct nflog_data *	nfad,
		u_int32_t *	seq
	)

nflog_get_seq_global - get the global nflog sequence number

Parameters

nfad	Netlink packet data handle passed to callback function

You must enable this via nflog_set_flags().

Returns: the global nflog sequence number.

References nflog_data::nfa, nfnl_attr_present, nfnl_get_data, and NFULA_SEQ_GLOBAL.

int nflog_get_timestamp	(	struct nflog_data *	nfad,
		struct timeval *	tv
	)

nflog_get_timestamp - get the packet timestamp

Parameters

nfad	Netlink packet data handle passed to callback function
tv	structure to fill with timestamp info

Retrieves the received timestamp when the given logged packet.

Returns: 0 on success, a negative value on failure.

References __be64_to_cpu, nflog_data::nfa, nfnl_get_pointer_to_data, NFULA_TIMESTAMP, nfulnl_msg_packet_timestamp::sec, and nfulnl_msg_packet_timestamp::usec.

int nflog_get_uid	(	struct nflog_data *	nfad,
		u_int32_t *	uid
	)

nflog_get_uid - get the UID of the user that has generated the packet

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: the UID of the user that has genered the packet, if any.

References nflog_data::nfa, nfnl_attr_present, nfnl_get_data, and NFULA_UID.

int nfq_get_gid	(	struct nfq_data *	nfad,
		u_int32_t *	gid
	)

nfq_get_gid - get the GID of the user the packet belongs to

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: 1 if there is a GID available, 0 otherwise.

References nfq_data::data, nfnl_attr_present, nfnl_get_data, and NFQA_GID.

Referenced by nfq_snprintf_xml().

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u_int32_t nfq_get_indev ( struct nfq_data * nfad )

nfq_get_indev - get the interface that the packet was received through

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: The index of the device the queued packet was received via. If the returned index is 0, the packet was locally generated or the input interface is not known (ie. POSTROUTING?).

Warning: all nfq_get_dev() functions return 0 if not set, since linux only allows ifindex >= 1, see net/core/dev.c:2600 (in 2.6.13.1)

References nfq_data::data, nfnl_get_data, and NFQA_IFINDEX_INDEV.

Referenced by nfq_get_indev_name(), and nfq_snprintf_xml().

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int nfq_get_indev_name	(	struct nlif_handle *	nlif_handle,
		struct nfq_data *	nfad,
		char *	name
	)

nfq_get_indev_name - get the name of the interface the packet was received through

Parameters

nlif_handle	pointer to a nlif interface resolving handle
nfad	Netlink packet data handle passed to callback function
name	pointer to the buffer to receive the interface name; not more than `IFNAMSIZ` bytes will be copied to it.

Returns: -1 in case of error, >0 if it succeed.

To use a nlif_handle, You need first to call nlif_open() and to open an handler. Don't forget to store the result as it will be used during all your program life:

    h = nlif_open();
    if (h == NULL) {
        perror("nlif_open");
        exit(EXIT_FAILURE);
    }

Once the handler is open, you need to fetch the interface table at a whole via a call to nlif_query.

    nlif_query(h);

libnfnetlink is able to update the interface mapping when a new interface appears. To do so, you need to call nlif_catch() on the handler after each interface related event. The simplest way to get and treat event is to run a select() or poll() against the nlif file descriptor. To get this file descriptor, you need to use nlif_fd:

    if_fd = nlif_fd(h);

Don't forget to close the handler when you don't need the feature anymore:

    nlif_close(h);

References nfq_get_indev(), and nlif_index2name().

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struct nfqnl_msg_packet_hdr* nfq_get_msg_packet_hdr ( struct nfq_data * nfad )

nfqnl_msg_packet_hdr - return the metaheader that wraps the packet

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: the netfilter queue netlink packet header for the given nfq_data argument. Typically, the nfq_data value is passed as the 3rd parameter to the callback function set by a call to nfq_create_queue().

The nfqnl_msg_packet_hdr structure is defined in libnetfilter_queue.h as:

    struct nfqnl_msg_packet_hdr {
        u_int32_t   packet_id;  // unique ID of packet in queue
        u_int16_t   hw_protocol;    // hw protocol (network order)
        u_int8_t    hook;       // netfilter hook
    } __attribute__ ((packed));

References nfq_data::data, nfnl_get_pointer_to_data, and NFQA_PACKET_HDR.

Referenced by nfq_snprintf_xml().

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uint32_t nfq_get_nfmark ( struct nfq_data * nfad )

nfq_get_nfmark - get the packet mark

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: the netfilter mark currently assigned to the given queued packet.

References nfq_data::data, nfnl_get_data, and NFQA_MARK.

Referenced by nfq_snprintf_xml().

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u_int32_t nfq_get_outdev ( struct nfq_data * nfad )

nfq_get_outdev - gets the interface that the packet will be routed out

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: The index of the device the queued packet will be sent out. If the returned index is 0, the packet is destined for localhost or the output interface is not yet known (ie. PREROUTING?).

References nfq_data::data, nfnl_get_data, and NFQA_IFINDEX_OUTDEV.

Referenced by nfq_get_outdev_name(), and nfq_snprintf_xml().

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int nfq_get_outdev_name	(	struct nlif_handle *	nlif_handle,
		struct nfq_data *	nfad,
		char *	name
	)

nfq_get_outdev_name - get the name of the physical interface the packet will be sent to

Parameters

nlif_handle	pointer to a nlif interface resolving handle
nfad	Netlink packet data handle passed to callback function
name	pointer to the buffer to receive the interface name; not more than `IFNAMSIZ` bytes will be copied to it.

See nfq_get_indev_name() documentation for nlif_handle usage.

Returns: -1 in case of error, > 0 if it succeed.

References nfq_get_outdev(), and nlif_index2name().

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struct nfqnl_msg_packet_hw* nfq_get_packet_hw ( struct nfq_data * nfad )

nfq_get_packet_hw

get hardware address

Parameters

nfad	Netlink packet data handle passed to callback function

Retrieves the hardware address associated with the given queued packet. For ethernet packets, the hardware address returned (if any) will be the MAC address of the packet source host. The destination MAC address is not known until after POSTROUTING and a successful ARP request, so cannot currently be retrieved.

The nfqnl_msg_packet_hw structure is defined in libnetfilter_queue.h as:

    struct nfqnl_msg_packet_hw {
        u_int16_t   hw_addrlen;
        u_int16_t   _pad;
        u_int8_t    hw_addr[8];
    } __attribute__ ((packed));

References nfq_data::data, nfnl_get_pointer_to_data, and NFQA_HWADDR.

Referenced by nfq_snprintf_xml().

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int nfq_get_payload	(	struct nfq_data *	nfad,
		unsigned char **	data
	)

nfq_get_payload - get payload

Parameters

nfad	Netlink packet data handle passed to callback function
data	Pointer of pointer that will be pointed to the payload

Retrieve the payload for a queued packet. The actual amount and type of data retrieved by this function will depend on the mode set with the nfq_set_mode() function.

Returns: -1 on error, otherwise > 0.

References nfq_data::data, NFA_PAYLOAD, nfnl_get_pointer_to_data, and NFQA_PAYLOAD.

Referenced by nfq_snprintf_xml().

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u_int32_t nfq_get_physindev ( struct nfq_data * nfad )

nfq_get_physindev - get the physical interface that the packet was received

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: The index of the physical device the queued packet was received via. If the returned index is 0, the packet was locally generated or the physical input interface is no longer known (ie. POSTROUTING?).

References nfq_data::data, nfnl_get_data, and NFQA_IFINDEX_PHYSINDEV.

Referenced by nfq_get_physindev_name(), and nfq_snprintf_xml().

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int nfq_get_physindev_name	(	struct nlif_handle *	nlif_handle,
		struct nfq_data *	nfad,
		char *	name
	)

nfq_get_physindev_name - get the name of the physical interface the packet was received through

Parameters

nlif_handle	pointer to a nlif interface resolving handle
nfad	Netlink packet data handle passed to callback function
name	pointer to the buffer to receive the interface name; not more than `IFNAMSIZ` bytes will be copied to it.

See nfq_get_indev_name() documentation for nlif_handle usage.

Returns: -1 in case of error, > 0 if it succeed.

References nfq_get_physindev(), and nlif_index2name().

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u_int32_t nfq_get_physoutdev ( struct nfq_data * nfad )

nfq_get_physoutdev - get the physical interface that the packet output

Parameters

nfad	Netlink packet data handle passed to callback function

The index of the physical device the queued packet will be sent out. If the returned index is 0, the packet is destined for localhost or the physical output interface is not yet known (ie. PREROUTING?).

Returns: The index of physical interface that the packet output will be routed out.

References nfq_data::data, nfnl_get_data, and NFQA_IFINDEX_PHYSOUTDEV.

Referenced by nfq_get_physoutdev_name(), and nfq_snprintf_xml().

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int nfq_get_physoutdev_name	(	struct nlif_handle *	nlif_handle,
		struct nfq_data *	nfad,
		char *	name
	)

nfq_get_physoutdev_name - get the name of the interface the packet will be sent to

Parameters

nlif_handle	pointer to a nlif interface resolving handle
nfad	Netlink packet data handle passed to callback function
name	pointer to the buffer to receive the interface name; not more than `IFNAMSIZ` bytes will be copied to it.

See nfq_get_indev_name() documentation for nlif_handle usage.

Returns: -1 in case of error, > 0 if it succeed.

References nfq_get_physoutdev(), and nlif_index2name().

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int nfq_get_timestamp	(	struct nfq_data *	nfad,
		struct timeval *	tv
	)

nfq_get_timestamp - get the packet timestamp

Parameters

nfad	Netlink packet data handle passed to callback function
tv	structure to fill with timestamp info

Retrieves the received timestamp when the given queued packet.

Returns: 0 on success, non-zero on failure.

References __be64_to_cpu, nfq_data::data, nfnl_get_pointer_to_data, NFQA_TIMESTAMP, nfqnl_msg_packet_timestamp::sec, and nfqnl_msg_packet_timestamp::usec.

int nfq_get_uid	(	struct nfq_data *	nfad,
		u_int32_t *	uid
	)

nfq_get_uid - get the UID of the user the packet belongs to

Parameters

nfad	Netlink packet data handle passed to callback function

Returns: 1 if there is a UID available, 0 otherwise.

References nfq_data::data, nfnl_attr_present, nfnl_get_data, and NFQA_UID.

Referenced by nfq_snprintf_xml().

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