Functions
struct nlmsghdr *	nfct_helper_nlmsg_build_hdr (char *buf, uint8_t cmd, uint16_t flags, uint32_t seq)

void	nfct_helper_nlmsg_build_payload (struct nlmsghdr nlh, struct nfct_helper h)

int	nfct_helper_nlmsg_parse_payload (const struct nlmsghdr nlh, struct nfct_helper h)

Detailed Description

Function Documentation

struct nlmsghdr* nfct_helper_nlmsg_build_hdr	(	char *	buf,
		uint8_t	cmd,
		uint16_t	flags,
		uint32_t	seq
	)

nfct_helper_nlmsg_build_hdr - build netlink message header for nfct_helper subsystem

Parameters

buf	buffer where this function outputs the netlink message.
cmd	nfct_helper nfnetlink command.
flags	netlink flags.
seq	sequence number for this message.

Possible commands:

Examples:

Command NFNL_MSG_ACCT_NEW + flags NLM_F_CREATE | NLM_F_ACK, to create one new helper object (if it does not already exists). You receive one acknoledgment in any case with the result of the operation.
Command NFNL_MSG_ACCT_GET + flags NLM_F_DUMP, to obtain all the existing helper objects.
Command NFNL_MSG_ACCT_DEL, to delete all existing unused objects.
Command NFNL_MSG_ACCT_DEL, to delete one specific nfct_helper object (if unused, otherwise you hit EBUSY).

Definition at line 494 of file libnetfilter_cthelper.c.

void nfct_helper_nlmsg_build_payload	(	struct nlmsghdr *	nlh,
		struct nfct_helper *	h
	)

nfct_helper_nlmsg_build_payload - build payload from helper object

Parameters

nlh	netlink message that you want to use to add the payload.
nfct_helper	pointer to a helper object

Definition at line 534 of file libnetfilter_cthelper.c.

int nfct_helper_nlmsg_parse_payload	(	const struct nlmsghdr *	nlh,
		struct nfct_helper *	h
	)

nfct_helper_nlmsg_parse_payload - set helper object attributes from message

Parameters

nlh	netlink message that you want to use to add the payload.
nfct_helper	pointer to a helper object

This function returns -1 in case that some mandatory attributes are missing. On sucess, it returns 0.

Definition at line 799 of file libnetfilter_cthelper.c.