#ifndef MINIMAL_IPV4_H
#define MINIMAL_IPV4_H
// From kernel header in.h 
// location: uapi/linux/in.h or linux/in.h (older kerns) or /usr/include/netinet/in.h (installed path)

#include "../sys.h"
#include "../int.h"

struct in_addr {
  uint32_t  s_addr;
};

#define __SOCK_SIZE__   16      /* sizeof(struct sockaddr)  */
struct sockaddr_in {
    unsigned short sin_family; // address family: AF_INET
    uint16_t       sin_port;   // port in network byte order
    struct in_addr sin_addr;   // internet address
    // Padding to match the size of struct sockaddr
    unsigned char  sin_zero[8];
};
/* Address to accept any incoming messages. */
#define INADDR_ANY      ((unsigned long int) 0x00000000)

/* Standard well-defined IP protocols.  */
enum {
  IPPROTO_IP = 0,       /* Dummy protocol for TCP       */
  IPPROTO_ICMP = 1,     /* Internet Control Message Protocol    */
  IPPROTO_IGMP = 2,     /* Internet Group Management Protocol   */
  IPPROTO_IPIP = 4,     /* IPIP tunnels (older KA9Q tunnels use 94) */
  IPPROTO_TCP = 6,      /* Transmission Control Protocol    */
  IPPROTO_EGP = 8,      /* Exterior Gateway Protocol        */
  IPPROTO_PUP = 12,     /* PUP protocol             */
  IPPROTO_UDP = 17,     /* User Datagram Protocol       */
  IPPROTO_IDP = 22,     /* XNS IDP protocol         */
  IPPROTO_DCCP = 33,        /* Datagram Congestion Control Protocol */
  IPPROTO_RSVP = 46,        /* RSVP protocol            */
  IPPROTO_GRE = 47,     /* Cisco GRE tunnels (rfc 1701,1702)    */

  IPPROTO_IPV6   = 41,      /* IPv6-in-IPv4 tunnelling      */

  IPPROTO_ESP = 50,            /* Encapsulation Security Payload protocol */
  IPPROTO_AH = 51,             /* Authentication Header protocol       */
  IPPROTO_BEETPH = 94,         /* IP option pseudo header for BEET */
  IPPROTO_PIM    = 103,     /* Protocol Independent Multicast   */

  IPPROTO_COMP   = 108,                /* Compression Header protocol */
  IPPROTO_SCTP   = 132,     /* Stream Control Transport Protocol    */

  IPPROTO_RAW    = 255,     /* Raw IP packets           */
  IPPROTO_MAX
};

#endif // MINIMAL_IPV4_H