09-23-2009
Is there some reason that the application generating the payload sometimes does it in network byte order and sometimes LE order? If you have control over this application, I suggest you fix it up to always generate network byte order packets.
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LEARN ABOUT LINUX
ipq_get_packet
IPQ_MESSAGE_TYPE(3) Linux Programmer's Manual IPQ_MESSAGE_TYPE(3)
NAME
ipq_message_type, ipq_get_packet, ipq_getmsgerr -- query queue messages
SYNOPSIS
#include <linux/netfilter.h>
#include <libipq.h>
int ipq_message_type(const unsigned char *buf);
ipq_packet_msg_t *ipq_get_packet(const unsigned char *buf);
int ipq_get_msgerr(const unsigned char *buf);
DESCRIPTION
The ipq_message_type function returns the type of queue message returned to userspace via ipq_read.
ipq_message_type should always be called following a successful call to ipq_read to determine whether the message is a packet message or an
error message. The buf parameter should be the same data obtained from the previous call to ipq_read.
ipq_message_type will return one of the following values:
NLMSG_ERROR
An error message generated by the Netlink transport.
IPQM_PACKET
A packet message containing packet metadata and optional packet payload data.
The ipq_get_packet function should be called if ipq_message_type returns IPQM_PACKET. The buf parameter should point to the same data used
for the call to ipq_message_type. The pointer returned by ipq_get_packet points to a packet message, which is declared as follows:
typedef struct ipq_packet_msg {
unsigned long packet_id; /* ID of queued packet */
unsigned long mark; /* Netfilter mark value */
long timestamp_sec; /* Packet arrival time (seconds) */
long timestamp_usec; /* Packet arrvial time (+useconds) */
unsigned int hook; /* Netfilter hook we rode in on */
char indev_name[IFNAMSIZ]; /* Name of incoming interface */
char outdev_name[IFNAMSIZ]; /* Name of outgoing interface */
unsigned short hw_protocol; /* Hardware protocol (network order) */
unsigned short hw_type; /* Hardware type */
unsigned char hw_addrlen; /* Hardware address length */
unsigned char hw_addr[8]; /* Hardware address */
size_t data_len; /* Length of packet data */
unsigned char payload[0]; /* Optional packet data */
} ipq_packet_msg_t;
Each of these fields may be read by the application. If the queue mode is IPQ_COPY_PACKET and the data_len value is greater than zero, the
packet payload contents may be accessed in the memory following the ipq_packet_msg_t structure to a range of data_len.
The packet_id field contains a packet identifier to be used when calling ipq_set_verdict.
The ipq_get_msgerr function should be called if ipq_message_type returns NLMSG_ERROR. The buf parameter should point to the same data used
for the call to ipq_message_type. The value returned by ipq_get_msgerr is set by higher level kernel code and corresponds to standard
errno values.
BUGS
None known.
AUTHOR
James Morris <jmorris@intercode.com.au>
COPYRIGHT
Copyright (c) 2000-2001 Netfilter Core Team.
Distributed under the GNU General Public License.
SEE ALSO
iptables(8), libipq(3).
Linux iptables 1.2 16 October 2001 IPQ_MESSAGE_TYPE(3)