/*********************************************************************
   PicoTCP. Copyright (c) 2012-2015 Altran Intelligent Systems. Some rights reserved.
   See LICENSE and COPYING for usage.

 *********************************************************************/
#ifndef INCLUDE_PICO_PROTOCOL
#define INCLUDE_PICO_PROTOCOL
#include "pico_config.h"
#include "pico_queue.h"

#define PICO_LOOP_DIR_IN   1
#define PICO_LOOP_DIR_OUT  2

enum pico_layer {
    PICO_LAYER_DATALINK = 2, /* Ethernet only. */
    PICO_LAYER_NETWORK = 3, /* IPv4, IPv6, ARP. Arp is there because it communicates with L2 */
    PICO_LAYER_TRANSPORT = 4, /* UDP, TCP, ICMP */
    PICO_LAYER_SOCKET = 5   /* Socket management */
};

enum pico_err_e {
    PICO_ERR_NOERR = 0,
    PICO_ERR_EPERM = 1,
    PICO_ERR_ENOENT = 2,
    /* ... */
    PICO_ERR_EINTR = 4,
    PICO_ERR_EIO = 5,
    PICO_ERR_ENXIO = 6,
    /* ... */
    PICO_ERR_EAGAIN = 11,
    PICO_ERR_ENOMEM = 12,
    PICO_ERR_EACCESS = 13,
    PICO_ERR_EFAULT = 14,
    /* ... */
    PICO_ERR_EBUSY = 16,
    PICO_ERR_EEXIST = 17,
    /* ... */
    PICO_ERR_EINVAL = 22,
    /* ... */
    PICO_ERR_ENONET = 64,
    /* ... */
    PICO_ERR_EPROTO = 71,
    /* ... */
    PICO_ERR_ENOPROTOOPT = 92,
    PICO_ERR_EPROTONOSUPPORT = 93,
    /* ... */
    PICO_ERR_EOPNOTSUPP = 95,
    PICO_ERR_EADDRINUSE = 98,
    PICO_ERR_EADDRNOTAVAIL = 99,
    PICO_ERR_ENETDOWN = 100,
    PICO_ERR_ENETUNREACH = 101,
    /* ... */
    PICO_ERR_ECONNRESET = 104,
    /* ... */
    PICO_ERR_EISCONN = 106,
    PICO_ERR_ENOTCONN = 107,
    PICO_ERR_ESHUTDOWN = 108,
    /* ... */
    PICO_ERR_ETIMEDOUT = 110,
    PICO_ERR_ECONNREFUSED = 111,
    PICO_ERR_EHOSTDOWN = 112,
    PICO_ERR_EHOSTUNREACH = 113,
};

typedef enum pico_err_e pico_err_t;
extern volatile pico_err_t pico_err;

#define IS_IPV6(f) (f && f->net_hdr && ((((uint8_t *)(f->net_hdr))[0] & 0xf0) == 0x60))
#define IS_IPV4(f) (f && f->net_hdr && ((((uint8_t *)(f->net_hdr))[0] & 0xf0) == 0x40))

#define MAX_PROTOCOL_NAME 16

struct pico_protocol {
    char name[MAX_PROTOCOL_NAME];
    uint32_t hash;
    enum pico_layer layer;
    uint16_t proto_number;
    struct pico_queue *q_in;
    struct pico_queue *q_out;
    struct pico_frame *(*alloc)(struct pico_protocol *self, uint16_t size); /* Frame allocation. */
    int (*push)(struct pico_protocol *self, struct pico_frame *p);    /* Push function, for active outgoing pkts from above */
    int (*process_out)(struct pico_protocol *self, struct pico_frame *p);  /* Send loop. */
    int (*process_in)(struct pico_protocol *self, struct pico_frame *p);  /* Recv loop. */
    uint16_t (*get_mtu)(struct pico_protocol *self);
};

int pico_protocols_loop(int loop_score);
void pico_protocol_init(struct pico_protocol *p);

int pico_protocol_datalink_loop(int loop_score, int direction);
int pico_protocol_network_loop(int loop_score, int direction);
int pico_protocol_transport_loop(int loop_score, int direction);
int pico_protocol_socket_loop(int loop_score, int direction);

#endif