/*
**********************************************************************************************
*	File: packet_io_util.h
*   Description: packet_io internal utils
*	Authors: Liu WenTan <liuwentan@geedgenetworks.com>
*	Date:    2022-07-15
*   Copyright: (c) 2018-2022 Geedge Networks, Inc. All rights reserved.
***********************************************************************************************
*/

#ifndef _PACKET_IO_UTIL_H_
#define _PACKET_IO_UTIL_H_

#ifdef __cpluscplus
extern "C"
{
#endif

#include <stdint.h>
#include <pthread.h>

#define STR_MAX_LEN 1024

#ifndef DLT_EN10MB
#define DLT_EN10MB 1
#endif

#define LINKTYPE_ETHERNET DLT_EN10MB

#define ETHERNET_TYPE_IP   0x0800
#define ETHERNET_TYPE_IPV6 0x86dd

#define PKT_QUEUE_MAX_NUM 256

#define CUSTOM_ZONE_LEN 64
#define ETHERNET_HEADER_LEN 14
#define DEFAULT_MTU 1500
#define DEFAULT_PACKET_SIZE (CUSTOM_ZONE_LEN + DEFAULT_MTU + ETHERNET_HEADER_LEN)

#define COMMON_SIZE_OF_PIO_PACKET (DEFAULT_PACKET_SIZE + sizeof(struct pio_packet))
#define MAX_SIZE_OF_PIO_PACKET (65535 + sizeof(struct pio_packet))

/**
 * @brief pcap_live/pcap_file mode packet structure
 *
 * |<-pkt_hdr    |<-pkt_payload
 * |             |
 * | struct pio_packet | custom zone | L2 header | ...... |
 *                        64bytes      14bytes    1500bytes
 *   
 * custom zone: user can set custom field
 * pkt_payload: received packet data
 */
struct pio_packet {
    /* pkt header pointer */
    void *pkt_hdr;

    /* pkt length */
    uint32_t pkt_len;

    /* pkt payload pointer */
    void *pkt_payload;

    /* data link type */
    uint32_t data_link;

    /* reference counts */
    uint32_t ref_cnt;

	struct pio_packet *prev;
	
	struct pio_packet *next;
};

struct pio_packet_queue {
	struct pio_packet *top;
	struct pio_packet *bot;
	uint32_t len;
	pthread_mutex_t mutex_q;
};

/**
 * @brief string copy safely, 
 * 
 * @retval  -1(failed), 0(success)
 */
ssize_t strncpy_safe(char *dst, const char *src, size_t dst_size);

ssize_t packet_copy_data(uint8_t *ptr, const uint8_t *pkt_data, uint32_t pkt_len);

/**
 * @brief ip hash function for struct pio_packet, 2 tuple(sip/dip) hash
 * 
 * @retval hash value
 */
uint64_t pio_packet_hash(struct pio_packet *p);

void pio_packet_queue_init(struct pio_packet_queue *);

void pio_packet_enqueue(struct pio_packet_queue *, struct pio_packet *);

struct pio_packet *pio_packet_dequeue(struct pio_packet_queue *);

void release_pio_packet_queue(struct pio_packet_queue *);

#ifdef __cpluscplus
}
#endif

#endif /* _PACKET_IO_UTIL_H_ */