This library provides the user-space network packet buffer. More...

Functions
struct pkt_buff *	pktb_alloc (int family, void *data, size_t len, size_t extra)
	pktb_alloc - allocate a new packet buffer More...

	EXPORT_SYMBOL (pktb_alloc)

uint8_t *	pktb_data (struct pkt_buff *pktb)
	pktb_data - return pointer to the beginning of the packet buffer More...

	EXPORT_SYMBOL (pktb_data)

uint32_t	pktb_len (struct pkt_buff *pktb)
	pktb_len - return length of the packet buffer More...

	EXPORT_SYMBOL (pktb_len)

void	pktb_free (struct pkt_buff *pktb)
	pktb_free - release packet buffer More...

	EXPORT_SYMBOL (pktb_free)

void	pktb_push (struct pkt_buff *pktb, unsigned int len)
	pktb_push - update pointer to the beginning of the packet buffer More...

	EXPORT_SYMBOL (pktb_push)

void	pktb_pull (struct pkt_buff *pktb, unsigned int len)
	pktb_pull - update pointer to the beginning of the packet buffer More...

	EXPORT_SYMBOL (pktb_pull)

void	pktb_put (struct pkt_buff *pktb, unsigned int len)
	pktb_put - add extra bytes to the tail of the packet buffer More...

	EXPORT_SYMBOL (pktb_put)

void	pktb_trim (struct pkt_buff *pktb, unsigned int len)
	pktb_trim - set new length for this packet buffer More...

	EXPORT_SYMBOL (pktb_trim)

unsigned int	pktb_tailroom (struct pkt_buff *pktb)
	pktb_tailroom - get room in bytes in the tail of the packet buffer More...

	EXPORT_SYMBOL (pktb_tailroom)

uint8_t *	pktb_mac_header (struct pkt_buff *pktb)
	pktb_mac_header - return pointer to layer 2 header (if any) More...

	EXPORT_SYMBOL (pktb_mac_header)

uint8_t *	pktb_network_header (struct pkt_buff *pktb)
	pktb_network_header - return pointer to layer 3 header More...

	EXPORT_SYMBOL (pktb_network_header)

uint8_t *	pktb_transport_header (struct pkt_buff *pktb)
	pktb_transport_header - return pointer to layer 4 header (if any) More...

	EXPORT_SYMBOL (pktb_transport_header)

int	pktb_mangle (struct pkt_buff pkt, unsigned int dataoff, unsigned int match_offset, unsigned int match_len, const char rep_buffer, unsigned int rep_len)

	EXPORT_SYMBOL (pktb_mangle)

bool	pktb_mangled (const struct pkt_buff *pkt)
	pktb_mangled - return true if packet has been mangled More...

	EXPORT_SYMBOL (pktb_mangled)

Detailed Description

This library provides the user-space network packet buffer.

This abstraction is strongly inspired by Linux kernel network buffer, the so-called sk_buff.

Function Documentation

EXPORT_SYMBOL ( pktb_alloc )

EXPORT_SYMBOL ( pktb_data )

EXPORT_SYMBOL ( pktb_len )

EXPORT_SYMBOL ( pktb_free )

EXPORT_SYMBOL ( pktb_push )

EXPORT_SYMBOL ( pktb_pull )

EXPORT_SYMBOL ( pktb_put )

EXPORT_SYMBOL ( pktb_trim )

EXPORT_SYMBOL ( pktb_tailroom )

EXPORT_SYMBOL ( pktb_mac_header )

EXPORT_SYMBOL ( pktb_network_header )

EXPORT_SYMBOL ( pktb_transport_header )

EXPORT_SYMBOL ( pktb_mangle )

EXPORT_SYMBOL ( pktb_mangled )

struct pkt_buff* pktb_alloc	(	int	family,
		void *	data,
		size_t	len,
		size_t	extra
	)

pktb_alloc - allocate a new packet buffer

Parameters

family	Indicate what family, eg. AF_BRIDGE, AF_INET, AF_INET6, ...
data	Pointer to packet data
len	Packet length
extra	Extra memory in the tail to be allocated (for mangling)

This function returns a packet buffer that contains the packet data and some extra memory room in the tail (in case of requested).

Returns: a pointer to a new queue handle or NULL on failure.

References pkt_buff::data, pkt_buff::data_len, ETH_HLEN, ETH_P_IP, ethhdr::h_proto, pkt_buff::head, pkt_buff::len, len, pkt_buff::mac_header, pkt_buff::network_header, NULL, and pkt_buff::tail.

uint8_t* pktb_data ( struct pkt_buff * pktb )

pktb_data - return pointer to the beginning of the packet buffer

Parameters

pktb	Pointer to packet buffer

References pkt_buff::data.

void pktb_free ( struct pkt_buff * pktb )

pktb_free - release packet buffer

Parameters

pktb	Pointer to packet buffer

uint32_t pktb_len ( struct pkt_buff * pktb )

pktb_len - return length of the packet buffer

Parameters

pktb	Pointer to packet buffer

References pkt_buff::len.

uint8_t* pktb_mac_header ( struct pkt_buff * pktb )

pktb_mac_header - return pointer to layer 2 header (if any)

Parameters

pktb	Pointer to packet buffer

References pkt_buff::mac_header.

int pktb_mangle	(	struct pkt_buff *	pkt,
		unsigned int	dataoff,
		unsigned int	match_offset,
		unsigned int	match_len,
		const char *	rep_buffer,
		unsigned int	rep_len
	)

References data, pkt_buff::len, pkt_buff::mangled, pkt_buff::network_header, pktb_put(), pktb_tailroom(), pktb_trim(), and pkt_buff::tail.

Referenced by nfq_ip_mangle().

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bool pktb_mangled ( const struct pkt_buff * pkt )

pktb_mangled - return true if packet has been mangled

Parameters

pktb	Pointer to packet buffer

References pkt_buff::mangled.

uint8_t* pktb_network_header ( struct pkt_buff * pktb )

pktb_network_header - return pointer to layer 3 header

Parameters

pktb	Pointer to packet buffer

References pkt_buff::network_header.

void pktb_pull	(	struct pkt_buff *	pktb,
		unsigned int	len
	)

pktb_pull - update pointer to the beginning of the packet buffer

Parameters

pktb	Pointer to packet buffer

References pkt_buff::data, pkt_buff::len, and len.

void pktb_push	(	struct pkt_buff *	pktb,
		unsigned int	len
	)

pktb_push - update pointer to the beginning of the packet buffer

Parameters

pktb	Pointer to packet buffer

References pkt_buff::data, pkt_buff::len, and len.

void pktb_put	(	struct pkt_buff *	pktb,
		unsigned int	len
	)

pktb_put - add extra bytes to the tail of the packet buffer

Parameters

pktb	Pointer to packet buffer

References pkt_buff::len, len, and pkt_buff::tail.

Referenced by pktb_mangle().

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unsigned int pktb_tailroom ( struct pkt_buff * pktb )

pktb_tailroom - get room in bytes in the tail of the packet buffer

Parameters

pktb	Pointer to packet buffer

References pkt_buff::data_len, and pkt_buff::len.

Referenced by pktb_mangle().

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uint8_t* pktb_transport_header ( struct pkt_buff * pktb )

pktb_transport_header - return pointer to layer 4 header (if any)

Parameters

pktb	Pointer to packet buffer

References pkt_buff::transport_header.

void pktb_trim	(	struct pkt_buff *	pktb,
		unsigned int	len
	)

pktb_trim - set new length for this packet buffer

Parameters

pktb	Pointer to packet buffer

References pkt_buff::len, and len.

Referenced by pktb_mangle().

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Functions

Detailed Description

Function Documentation