Netlink message helper functions

Functions
struct nlmsghdr *	nfacct_nlmsg_build_hdr (char *buf, uint8_t cmd, uint16_t flags, uint32_t seq)
void	nfacct_nlmsg_build_payload (struct nlmsghdr *nlh, struct nfacct *nfacct)
int	nfacct_nlmsg_parse_payload (const struct nlmsghdr *nlh, struct nfacct *nfacct)

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Function Documentation

struct nlmsghdr* nfacct_nlmsg_build_hdr	(	char *	buf,
		uint8_t	cmd,
		uint16_t	flags,
		uint32_t	seq
	)			[read]

nfacct_nlmsg_build_hdr - build netlink message header for nfacct subsystem

Parameters:

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

Possible commands:

• NFNL_MSG_ACCT_NEW: new accounting object.
• NFNL_MSG_ACCT_GET: get accounting object.
• NFNL_MSG_ACCT_GET_CTRZERO: get accounting object and atomically reset.

Examples:

• Command NFNL_MSG_ACCT_NEW + flags NLM_F_CREATE | NLM_F_ACK, to create one new accounting 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 accounting objects.

• Command NFNL_MSG_ACCT_GET_CTRZERO + flags NLM_F_DUMP, to atomically obtain all the existing accounting objects and reset them.

• Command NFNL_MSG_ACCT_DEL, to delete all existing unused objects.

• Command NFNL_MSG_ACCT_DEL, to delete one specific nfacct object (if unused, otherwise you hit EBUSY).

Definition at line 318 of file libnetfilter_acct.c.

void nfacct_nlmsg_build_payload	(	struct nlmsghdr *	nlh,
		struct nfacct *	nfacct
	)

nfacct_nlmsg_build_payload - build payload from accounting object

Parameters:

	nlh,:	netlink message that you want to use to add the payload.
	nfacct,:	pointer to a accounting object

Definition at line 342 of file libnetfilter_acct.c.

int nfacct_nlmsg_parse_payload	(	const struct nlmsghdr *	nlh,
		struct nfacct *	nfacct
	)

nfacct_nlmsg_parse_payload - set accounting object attributes from message

Parameters:

	nlh,:	netlink message that you want to use to add the payload.
	nfacct,:	pointer to a accounting object

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

Definition at line 396 of file libnetfilter_acct.c.