Man page - nflog_nlmsg_snprintf(3)

Packages contains this manual

Package:  libnetfilter-log-doc
apt-get install libnetfilter-log-doc

Manuals in package:
• nflog_snprintf_xml(3)
• nflog_nlmsg_parse(3)
• nflog_unbind_pf(3)
• nflog_get_physindev(3)
• nflog_unbind_group(3)
• nflog_set_qthresh(3)
• nflog_fd(3)
• nflog_get_uid(3)
• nflog_bind_group(3)
• nflog_set_timeout(3)
• nflog_nlmsg_put_header(3)
• nflog_get_seq_global(3)
• nflog_get_msg_packet_hwhdr(3)
• nflog_get_payload(3)
• nflog_get_hwtype(3)
• nflog_get_gid(3)
• nflog_nlmsg_snprintf(3)
• nflog_get_physoutdev(3)
• nflog_callback_register(3)
• nflog_bind_pf(3)
• nflog_close(3)
• nflog_set_flags(3)
• nflog_get_nfmark(3)
• nflog_set_nlbufsiz(3)
• nflog_get_msg_packet_hdr(3)
• nflog_set_mode(3)
• nflog_get_seq(3)
• nflog_attr_put_cfg_mode(3)
• nflog_get_timestamp(3)
• nflog_get_indev(3)
• nflog_attr_put_cfg_cmd(3)
• nflog_get_prefix(3)
• nflog_get_outdev(3)
• nflog_get_packet_hw(3)
• nflog_get_ctid(3)
• nflog_handle_packet(3)
• nflog_get_msg_packet_hwhdrlen(3)
• nflog_open(3)
Documentations in package:
• libnetfilter-log-doc
• libnetfilter-log-dev

Manual

nlmsg

NAME
SYNOPSIS
Function Documentation
int nflog_attr_put_cfg_cmd (struct nlmsghdr * nlh, uint8_t cmd)
int nflog_attr_put_cfg_mode (struct nlmsghdr * nlh, uint8_t mode, uint32_trange)
int nflog_nlmsg_parse (const struct nlmsghdr * nlh, struct nlattr ** attr)
struct nlmsghdr * nflog_nlmsg_put_header (char * buf, uint8_t type, uint8_tfamily, uint16_t gnum)
int nflog_nlmsg_snprintf (char * buf, size_t bufsiz, const struct nlmsghdr* nlh, struct nlattr ** attr, enum nflog_output_type type, uint32_tflags)
Author

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NAME

nflog_nlmsg_put_header, nflog_attr_put_cfg_mode, nflog_attr_put_cfg_cmd, nflog_nlmsg_parse, nflog_nlmsg_snprintf - Netlink message helper functions

SYNOPSIS

#include <netinet/in.h>
#include <libnetfilter_log/libnetfilter_log.h>

struct nlmsghdr * nflog_nlmsg_put_header (char *buf, uint8_t type, uint8_t family, uint16_t gnum)
int nflog_attr_put_cfg_mode (struct nlmsghdr *nlh, uint8_t mode, uint32_t range)
int nflog_attr_put_cfg_cmd (struct nlmsghdr *nlh, uint8_t cmd)
int nflog_nlmsg_parse (const struct nlmsghdr *nlh, struct nlattr **attr)
int nflog_nlmsg_snprintf (char *buf, size_t bufsiz, const struct nlmsghdr *nlh, struct nlattr **attr, enum nflog_output_type type, uint32_t flags)

Function Documentation

int nflog_attr_put_cfg_cmd (struct nlmsghdr * nlh, uint8_t cmd)

nflog_attr_put_cfg_cmd - add a command attribute to nflog netlink message

Parameters

nlh pointer to netlink message
cmd one of the enum nfulnl_msg_config_cmds

Returns

0

Definition at line 84 of file nlmsg.c .

int nflog_attr_put_cfg_mode (struct nlmsghdr * nlh, uint8_t mode, uint32_trange)

nflog_attr_put_cfg_mode - add a mode attribute to nflog netlink message

Parameters

nlh pointer to netlink message
mode copy mode: NFULNL_COPY_NONE, NFULNL_COPY_META or NFULNL_COPY_PACKET
range copy range

Returns

0

Definition at line 64 of file nlmsg.c .

int nflog_nlmsg_parse (const struct nlmsghdr * nlh, struct nlattr ** attr)

nflog_nlmsg_parse - set nlattrs from netlink message

Parameters

nlh pointer to netlink message
attr pointer to an array of nlattr of size NFULA_MAX + 1

Returns

0

Definition at line 162 of file nlmsg.c .

struct nlmsghdr * nflog_nlmsg_put_header (char * buf, uint8_t type, uint8_tfamily, uint16_t gnum)

nflog_nlmsg_put_header - populate memory buffer with nflog Netlink headers

Parameters

buf pointer to memory buffer
type either NFULNL_MSG_PACKET or NFULNL_MSG_CONFIG (enum nfulnl_msg_types)
family protocol family
gnum group number

Initialises buf to start with a netlink header for the log subsystem followed by an nfnetlink header with the log group

Returns

pointer to created Netlink header structure

Definition at line 39 of file nlmsg.c .

int nflog_nlmsg_snprintf (char * buf, size_t bufsiz, const struct nlmsghdr* nlh, struct nlattr ** attr, enum nflog_output_type type, uint32_tflags)

nflog_nlmsg_snprintf - print a nflog nlattrs to a buffer

Parameters

buf buffer used to build the printable nflog
bufsiz size of the buffer
nlh pointer to netlink message (to get queue num in the future)
attr pointer to an array of nlattr of size NFULA_MAX + 1
type print message type in enum nflog_output_type
flags The flag that tell what to print into the buffer

This function supports the following types / flags:

type: NFLOG_OUTPUT_XML

	•		NFLOG_XML_PREFIX: include the string prefix
	•		NFLOG_XML_HW: include the hardware link layer address
	•		NFLOG_XML_MARK: include the packet mark
	•		NFLOG_XML_DEV: include the device information
	•		NFLOG_XML_PHYSDEV: include the physical device information
	•		NFLOG_XML_PAYLOAD: include the payload (in hexadecimal)
	•		NFLOG_XML_TIME: include the timestamp
	•		NFLOG_XML_ALL: include all the logging information (all flags set)

You can combine these flags with a bitwise OR.

Returns

-1 on failure else same as snprintf

Errors

EOPNOTSUPP type is unsupported (i.e. not NFLOG_OUTPUT_XML )

See also

snprintf (3)

Definition at line 196 of file nlmsg.c .

Author

Generated automatically by Doxygen for libnetfilter_log from the source code.

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