IPv6 helper functions

Functions
struct ip6_hdr *	nfq_ip6_get_hdr (struct pkt_buff *pktb)
int	nfq_ip6_set_transport_header (struct pkt_buff *pktb, struct ip6_hdr *ip6h, uint8_t target)
int	nfq_ip6_mangle (struct pkt_buff *pktb, unsigned int dataoff, unsigned int match_offset, unsigned int match_len, const char *rep_buffer, unsigned int rep_len)
int	nfq_ip6_snprintf (char *buf, size_t size, const struct ip6_hdr *ip6h)

Detailed Description

Function Documentation

nfq_ip6_get_hdr()

struct ip6_hdr* nfq_ip6_get_hdr

(

struct pkt_buff *

pktb

)

nfq_ip6_get_hdr - get IPv6 header

Parameters

pktb	Pointer to user-space network packet buffer

Returns

pointer to IPv6 header if a valid header found, else NULL.

Definition at line 36 of file ipv6.c.

nfq_ip6_mangle()

int nfq_ip6_mangle	(	struct pkt_buff *	pktb,
		unsigned int	dataoff,
		unsigned int	match_offset,
		unsigned int	match_len,
		const char *	rep_buffer,
		unsigned int	rep_len
	)

nfq_ip6_mangle - mangle IPv6 packet buffer

Parameters

pktb	Pointer to user-space network packet buffer
dataoff	Offset to layer 4 header
match_offset	Offset to content that you want to mangle
match_len	Length of the existing content you want to mangle
rep_buffer	Pointer to data you want to use to replace current content
rep_len	Length of data you want to use to replace current content

Returns

1 for success and 0 for failure. See pktb_mangle() for failure case

Note

This function updates the IPv6 length (if necessary)

Definition at line 131 of file ipv6.c.

nfq_ip6_set_transport_header()

int nfq_ip6_set_transport_header	(	struct pkt_buff *	pktb,
		struct ip6_hdr *	ip6h,
		uint8_t	target
	)

nfq_ip6_set_transport_header - set transport header pointer for IPv6 packet

Parameters

pktb	Pointer to user-space network packet buffer
ip6h	Pointer to IPv6 header
target	Protocol number to find transport header (ie. IPPROTO_*)

Returns

1 if the protocol has been found and the transport header has been set, else 0.

Definition at line 64 of file ipv6.c.

nfq_ip6_snprintf()

int nfq_ip6_snprintf	(	char *	buf,
		size_t	size,
		const struct ip6_hdr *	ip6h
	)

nfq_ip6_snprintf - print IPv6 header into one buffer in iptables LOG format

Parameters

buf	Pointer to buffer that is used to print the object
size	Size of the buffer (or remaining room in it).
ip6h	Pointer to a valid IPv6 header.

Returns

same as snprintf

See also

snprintf(3)

Definition at line 158 of file ipv6.c.