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/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2018 Intel Corporation
 */

/*
 * eBPF program sample.
 * Accepts pointer to struct rte_mbuf as an input parameter.
 * Dump the mbuf into stdout if it is an ARP packet (aka tcpdump 'arp').
 * To compile:
 * clang -O2 -I${RTE_SDK}/${RTE_TARGET}/include \
 * -target bpf -Wno-int-to-void-pointer-cast -c t3.c
 */

#include <stdint.h>
#include <stddef.h>
#include <stdio.h>
#include <net/ethernet.h>
#include <rte_config.h>
#include "mbuf.h"

extern void rte_pktmbuf_dump(FILE *, const struct rte_mbuf *, unsigned int);

uint64_t
entry(const void *pkt)
{
	const struct rte_mbuf *mb;
	const struct ether_header *eth;

	mb = pkt;
	eth = rte_pktmbuf_mtod(mb, const struct ether_header *);

	if (eth->ether_type == __builtin_bswap16(ETHERTYPE_ARP))
		rte_pktmbuf_dump(stdout, mb, 64);

	return 1;
}