LibrarySetup(3)

NAME
nflog_open, nflog_close, nflog_bind_pf, nflog_unbind_pf - LibrarySetup

SYNOPSIS

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

struct nflog_handle * nflog_open (void)
int nflog_close (struct nflog_handle *h)
int nflog_bind_pf (struct nflog_handle *h, uint16_t pf)
int nflog_unbind_pf (struct nflog_handle *h, uint16_t pf)

Detailed Description

When the program has finished with libnetfilter_log, it has to call the nflog_close() function to release all associated resources.

Function Documentation

  int nflog_bind_pf (struct nflog_handle * h, uint16_t pf)
nflog_bind_pf - bind a nflog handler to a given protocol family

Parameters
    h Netfilter log handle obtained via call to nflog_open()
    pf protocol family to bind to nflog handler obtained from nflog_open()

Binds the given log connection handle to process packets belonging to the given protocol family (ie. PF_INET, PF_INET6, etc).

Returns
    0 on success, -1 on failure with errno set.

Errors
    EOPNOTSUPP Not running as root

  int nflog_close (struct nflog_handle * h)
nflog_close - close a nflog handler

Parameters
    h Netfilter log handle obtained via call to nflog_open()

This function closes the nflog handler and free associated resources.

Returns
    0 on success, -1 on failure with errno set.

Errors
    as for close(2)

  struct nflog_handle* nflog_open (void)
nflog_open - open a nflog handler

This function obtains a netfilter log connection handle. When you are finished with the handle returned by this function, you should destroy it by calling nflog_close(). A new netlink connection is obtained internally and associated with the log connection handle returned.

Returns
    a pointer to a new log handle or NULL on failure with errno set.

Errors
    from underlying calls, in exceptional circumstances

  int nflog_unbind_pf (struct nflog_handle * h, uint16_t pf)
nflog_unbind_pf - unbind nflog handler from a protocol family

Parameters
    h Netfilter log handle obtained via call to nflog_open()
    pf protocol family to unbind family from

Unbinds the given nflog handle from processing packets belonging to the given protocol family.

Returns
    0 on success, -1 on failure with errno set.

Errors
    EOPNOTSUPP Not running as root

Author

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