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/*
* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This code has been sponsored by Vyatta Inc. <http://www.vyatta.com>
*/
#include <stdio.h>
#define _GNU_SOURCE
#include <netinet/ip_icmp.h>
#include <libnetfilter_queue/libnetfilter_queue_icmp.h>
#include "internal.h"
/**
* \defgroup icmp ICMP helper functions
*
* \manonly
.SH SYNOPSIS
.nf
\fB
#include <libmnl/libmnl.h>
#include <libnetfilter_queue/libnetfilter_queue_icmp.h>
\endmanonly
*
* @{
*/
/**
* nfq_icmp_get_hdr - get the ICMP header.
* \param pktb: pointer to user-space network packet buffer
* \returns validated pointer to the ICMP header or NULL if the ICMP header was
* not set or if a minimal length check fails.
* \note You have to call nfq_ip_set_transport_header() or
* nfq_ip6_set_transport_header() first to set the ICMP header.
*/
EXPORT_SYMBOL
struct icmphdr *nfq_icmp_get_hdr(struct pkt_buff *pktb)
{
if (pktb->transport_header == NULL)
return NULL;
/* No room for the ICMP header. */
if (pktb_tail(pktb) - pktb->transport_header < sizeof(struct icmphdr))
return NULL;
return (struct icmphdr *)pktb->transport_header;
}
/**
* @}
*/
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